2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
33 * Standards documents from:
34 * http://www.t13.org (ATA standards, PCI DMA IDE spec)
35 * http://www.t10.org (SCSI MMC - for ATAPI MMC)
36 * http://www.sata-io.org (SATA)
37 * http://www.compactflash.org (CF)
38 * http://www.qic.org (QIC157 - Tape and DSC)
39 * http://www.ce-ata.org (CE-ATA: not supported)
43 #include <linux/kernel.h>
44 #include <linux/module.h>
45 #include <linux/pci.h>
46 #include <linux/init.h>
47 #include <linux/list.h>
49 #include <linux/highmem.h>
50 #include <linux/spinlock.h>
51 #include <linux/blkdev.h>
52 #include <linux/delay.h>
53 #include <linux/timer.h>
54 #include <linux/interrupt.h>
55 #include <linux/completion.h>
56 #include <linux/suspend.h>
57 #include <linux/workqueue.h>
58 #include <linux/jiffies.h>
59 #include <linux/scatterlist.h>
61 #include <scsi/scsi.h>
62 #include <scsi/scsi_cmnd.h>
63 #include <scsi/scsi_host.h>
64 #include <linux/libata.h>
65 #include <asm/semaphore.h>
66 #include <asm/byteorder.h>
71 /* debounce timing parameters in msecs { interval, duration, timeout } */
72 const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
73 const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
74 const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
76 static unsigned int ata_dev_init_params(struct ata_device *dev,
77 u16 heads, u16 sectors);
78 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
79 static unsigned int ata_dev_set_feature(struct ata_device *dev,
80 u8 enable, u8 feature);
81 static void ata_dev_xfermask(struct ata_device *dev);
82 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
84 unsigned int ata_print_id = 1;
85 static struct workqueue_struct *ata_wq;
87 struct workqueue_struct *ata_aux_wq;
89 int atapi_enabled = 1;
90 module_param(atapi_enabled, int, 0444);
91 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
94 module_param(atapi_dmadir, int, 0444);
95 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
97 int atapi_passthru16 = 1;
98 module_param(atapi_passthru16, int, 0444);
99 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");
102 module_param_named(fua, libata_fua, int, 0444);
103 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
105 static int ata_ignore_hpa;
106 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
107 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
109 static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
110 module_param_named(dma, libata_dma_mask, int, 0444);
111 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
113 static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
114 module_param(ata_probe_timeout, int, 0444);
115 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
117 int libata_noacpi = 0;
118 module_param_named(noacpi, libata_noacpi, int, 0444);
119 MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set");
121 MODULE_AUTHOR("Jeff Garzik");
122 MODULE_DESCRIPTION("Library module for ATA devices");
123 MODULE_LICENSE("GPL");
124 MODULE_VERSION(DRV_VERSION);
128 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
129 * @tf: Taskfile to convert
130 * @pmp: Port multiplier port
131 * @is_cmd: This FIS is for command
132 * @fis: Buffer into which data will output
134 * Converts a standard ATA taskfile to a Serial ATA
135 * FIS structure (Register - Host to Device).
138 * Inherited from caller.
140 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
142 fis[0] = 0x27; /* Register - Host to Device FIS */
143 fis[1] = pmp & 0xf; /* Port multiplier number*/
145 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
147 fis[2] = tf->command;
148 fis[3] = tf->feature;
155 fis[8] = tf->hob_lbal;
156 fis[9] = tf->hob_lbam;
157 fis[10] = tf->hob_lbah;
158 fis[11] = tf->hob_feature;
161 fis[13] = tf->hob_nsect;
172 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
173 * @fis: Buffer from which data will be input
174 * @tf: Taskfile to output
176 * Converts a serial ATA FIS structure to a standard ATA taskfile.
179 * Inherited from caller.
182 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
184 tf->command = fis[2]; /* status */
185 tf->feature = fis[3]; /* error */
192 tf->hob_lbal = fis[8];
193 tf->hob_lbam = fis[9];
194 tf->hob_lbah = fis[10];
197 tf->hob_nsect = fis[13];
200 static const u8 ata_rw_cmds[] = {
204 ATA_CMD_READ_MULTI_EXT,
205 ATA_CMD_WRITE_MULTI_EXT,
209 ATA_CMD_WRITE_MULTI_FUA_EXT,
213 ATA_CMD_PIO_READ_EXT,
214 ATA_CMD_PIO_WRITE_EXT,
227 ATA_CMD_WRITE_FUA_EXT
231 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
232 * @tf: command to examine and configure
233 * @dev: device tf belongs to
235 * Examine the device configuration and tf->flags to calculate
236 * the proper read/write commands and protocol to use.
241 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
245 int index, fua, lba48, write;
247 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
248 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
249 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
251 if (dev->flags & ATA_DFLAG_PIO) {
252 tf->protocol = ATA_PROT_PIO;
253 index = dev->multi_count ? 0 : 8;
254 } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
255 /* Unable to use DMA due to host limitation */
256 tf->protocol = ATA_PROT_PIO;
257 index = dev->multi_count ? 0 : 8;
259 tf->protocol = ATA_PROT_DMA;
263 cmd = ata_rw_cmds[index + fua + lba48 + write];
272 * ata_tf_read_block - Read block address from ATA taskfile
273 * @tf: ATA taskfile of interest
274 * @dev: ATA device @tf belongs to
279 * Read block address from @tf. This function can handle all
280 * three address formats - LBA, LBA48 and CHS. tf->protocol and
281 * flags select the address format to use.
284 * Block address read from @tf.
286 u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
290 if (tf->flags & ATA_TFLAG_LBA) {
291 if (tf->flags & ATA_TFLAG_LBA48) {
292 block |= (u64)tf->hob_lbah << 40;
293 block |= (u64)tf->hob_lbam << 32;
294 block |= tf->hob_lbal << 24;
296 block |= (tf->device & 0xf) << 24;
298 block |= tf->lbah << 16;
299 block |= tf->lbam << 8;
304 cyl = tf->lbam | (tf->lbah << 8);
305 head = tf->device & 0xf;
308 block = (cyl * dev->heads + head) * dev->sectors + sect;
315 * ata_build_rw_tf - Build ATA taskfile for given read/write request
316 * @tf: Target ATA taskfile
317 * @dev: ATA device @tf belongs to
318 * @block: Block address
319 * @n_block: Number of blocks
320 * @tf_flags: RW/FUA etc...
326 * Build ATA taskfile @tf for read/write request described by
327 * @block, @n_block, @tf_flags and @tag on @dev.
331 * 0 on success, -ERANGE if the request is too large for @dev,
332 * -EINVAL if the request is invalid.
334 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
335 u64 block, u32 n_block, unsigned int tf_flags,
338 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
339 tf->flags |= tf_flags;
341 if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
343 if (!lba_48_ok(block, n_block))
346 tf->protocol = ATA_PROT_NCQ;
347 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
349 if (tf->flags & ATA_TFLAG_WRITE)
350 tf->command = ATA_CMD_FPDMA_WRITE;
352 tf->command = ATA_CMD_FPDMA_READ;
354 tf->nsect = tag << 3;
355 tf->hob_feature = (n_block >> 8) & 0xff;
356 tf->feature = n_block & 0xff;
358 tf->hob_lbah = (block >> 40) & 0xff;
359 tf->hob_lbam = (block >> 32) & 0xff;
360 tf->hob_lbal = (block >> 24) & 0xff;
361 tf->lbah = (block >> 16) & 0xff;
362 tf->lbam = (block >> 8) & 0xff;
363 tf->lbal = block & 0xff;
366 if (tf->flags & ATA_TFLAG_FUA)
367 tf->device |= 1 << 7;
368 } else if (dev->flags & ATA_DFLAG_LBA) {
369 tf->flags |= ATA_TFLAG_LBA;
371 if (lba_28_ok(block, n_block)) {
373 tf->device |= (block >> 24) & 0xf;
374 } else if (lba_48_ok(block, n_block)) {
375 if (!(dev->flags & ATA_DFLAG_LBA48))
379 tf->flags |= ATA_TFLAG_LBA48;
381 tf->hob_nsect = (n_block >> 8) & 0xff;
383 tf->hob_lbah = (block >> 40) & 0xff;
384 tf->hob_lbam = (block >> 32) & 0xff;
385 tf->hob_lbal = (block >> 24) & 0xff;
387 /* request too large even for LBA48 */
390 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
393 tf->nsect = n_block & 0xff;
395 tf->lbah = (block >> 16) & 0xff;
396 tf->lbam = (block >> 8) & 0xff;
397 tf->lbal = block & 0xff;
399 tf->device |= ATA_LBA;
402 u32 sect, head, cyl, track;
404 /* The request -may- be too large for CHS addressing. */
405 if (!lba_28_ok(block, n_block))
408 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
411 /* Convert LBA to CHS */
412 track = (u32)block / dev->sectors;
413 cyl = track / dev->heads;
414 head = track % dev->heads;
415 sect = (u32)block % dev->sectors + 1;
417 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
418 (u32)block, track, cyl, head, sect);
420 /* Check whether the converted CHS can fit.
424 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
427 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
438 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
439 * @pio_mask: pio_mask
440 * @mwdma_mask: mwdma_mask
441 * @udma_mask: udma_mask
443 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
444 * unsigned int xfer_mask.
452 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
453 unsigned int mwdma_mask,
454 unsigned int udma_mask)
456 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
457 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
458 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
462 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
463 * @xfer_mask: xfer_mask to unpack
464 * @pio_mask: resulting pio_mask
465 * @mwdma_mask: resulting mwdma_mask
466 * @udma_mask: resulting udma_mask
468 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
469 * Any NULL distination masks will be ignored.
471 static void ata_unpack_xfermask(unsigned int xfer_mask,
472 unsigned int *pio_mask,
473 unsigned int *mwdma_mask,
474 unsigned int *udma_mask)
477 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
479 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
481 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
484 static const struct ata_xfer_ent {
488 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
489 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
490 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
495 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
496 * @xfer_mask: xfer_mask of interest
498 * Return matching XFER_* value for @xfer_mask. Only the highest
499 * bit of @xfer_mask is considered.
505 * Matching XFER_* value, 0 if no match found.
507 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
509 int highbit = fls(xfer_mask) - 1;
510 const struct ata_xfer_ent *ent;
512 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
513 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
514 return ent->base + highbit - ent->shift;
519 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
520 * @xfer_mode: XFER_* of interest
522 * Return matching xfer_mask for @xfer_mode.
528 * Matching xfer_mask, 0 if no match found.
530 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
532 const struct ata_xfer_ent *ent;
534 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
535 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
536 return 1 << (ent->shift + xfer_mode - ent->base);
541 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
542 * @xfer_mode: XFER_* of interest
544 * Return matching xfer_shift for @xfer_mode.
550 * Matching xfer_shift, -1 if no match found.
552 static int ata_xfer_mode2shift(unsigned int xfer_mode)
554 const struct ata_xfer_ent *ent;
556 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
557 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
563 * ata_mode_string - convert xfer_mask to string
564 * @xfer_mask: mask of bits supported; only highest bit counts.
566 * Determine string which represents the highest speed
567 * (highest bit in @modemask).
573 * Constant C string representing highest speed listed in
574 * @mode_mask, or the constant C string "<n/a>".
576 static const char *ata_mode_string(unsigned int xfer_mask)
578 static const char * const xfer_mode_str[] = {
602 highbit = fls(xfer_mask) - 1;
603 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
604 return xfer_mode_str[highbit];
608 static const char *sata_spd_string(unsigned int spd)
610 static const char * const spd_str[] = {
615 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
617 return spd_str[spd - 1];
620 void ata_dev_disable(struct ata_device *dev)
622 if (ata_dev_enabled(dev)) {
623 if (ata_msg_drv(dev->link->ap))
624 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
625 ata_acpi_on_disable(dev);
626 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
632 static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
634 struct ata_link *link = dev->link;
635 struct ata_port *ap = link->ap;
637 unsigned int err_mask;
641 * disallow DIPM for drivers which haven't set
642 * ATA_FLAG_IPM. This is because when DIPM is enabled,
643 * phy ready will be set in the interrupt status on
644 * state changes, which will cause some drivers to
645 * think there are errors - additionally drivers will
646 * need to disable hot plug.
648 if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
649 ap->pm_policy = NOT_AVAILABLE;
654 * For DIPM, we will only enable it for the
657 * Why? Because Disks are too stupid to know that
658 * If the host rejects a request to go to SLUMBER
659 * they should retry at PARTIAL, and instead it
660 * just would give up. So, for medium_power to
661 * work at all, we need to only allow HIPM.
663 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
669 /* no restrictions on IPM transitions */
670 scontrol &= ~(0x3 << 8);
671 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
676 if (dev->flags & ATA_DFLAG_DIPM)
677 err_mask = ata_dev_set_feature(dev,
678 SETFEATURES_SATA_ENABLE, SATA_DIPM);
681 /* allow IPM to PARTIAL */
682 scontrol &= ~(0x1 << 8);
683 scontrol |= (0x2 << 8);
684 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
689 * we don't have to disable DIPM since IPM flags
690 * disallow transitions to SLUMBER, which effectively
691 * disable DIPM if it does not support PARTIAL
695 case MAX_PERFORMANCE:
696 /* disable all IPM transitions */
697 scontrol |= (0x3 << 8);
698 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
703 * we don't have to disable DIPM since IPM flags
704 * disallow all transitions which effectively
705 * disable DIPM anyway.
710 /* FIXME: handle SET FEATURES failure */
717 * ata_dev_enable_pm - enable SATA interface power management
718 * @dev: device to enable power management
719 * @policy: the link power management policy
721 * Enable SATA Interface power management. This will enable
722 * Device Interface Power Management (DIPM) for min_power
723 * policy, and then call driver specific callbacks for
724 * enabling Host Initiated Power management.
727 * Returns: -EINVAL if IPM is not supported, 0 otherwise.
729 void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
732 struct ata_port *ap = dev->link->ap;
734 /* set HIPM first, then DIPM */
735 if (ap->ops->enable_pm)
736 rc = ap->ops->enable_pm(ap, policy);
739 rc = ata_dev_set_dipm(dev, policy);
743 ap->pm_policy = MAX_PERFORMANCE;
745 ap->pm_policy = policy;
746 return /* rc */; /* hopefully we can use 'rc' eventually */
751 * ata_dev_disable_pm - disable SATA interface power management
752 * @dev: device to disable power management
754 * Disable SATA Interface power management. This will disable
755 * Device Interface Power Management (DIPM) without changing
756 * policy, call driver specific callbacks for disabling Host
757 * Initiated Power management.
762 static void ata_dev_disable_pm(struct ata_device *dev)
764 struct ata_port *ap = dev->link->ap;
766 ata_dev_set_dipm(dev, MAX_PERFORMANCE);
767 if (ap->ops->disable_pm)
768 ap->ops->disable_pm(ap);
770 #endif /* CONFIG_PM */
772 void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
774 ap->pm_policy = policy;
775 ap->link.eh_info.action |= ATA_EHI_LPM;
776 ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
777 ata_port_schedule_eh(ap);
781 static void ata_lpm_enable(struct ata_host *host)
783 struct ata_link *link;
785 struct ata_device *dev;
788 for (i = 0; i < host->n_ports; i++) {
790 ata_port_for_each_link(link, ap) {
791 ata_link_for_each_dev(dev, link)
792 ata_dev_disable_pm(dev);
797 static void ata_lpm_disable(struct ata_host *host)
801 for (i = 0; i < host->n_ports; i++) {
802 struct ata_port *ap = host->ports[i];
803 ata_lpm_schedule(ap, ap->pm_policy);
806 #endif /* CONFIG_PM */
810 * ata_devchk - PATA device presence detection
811 * @ap: ATA channel to examine
812 * @device: Device to examine (starting at zero)
814 * This technique was originally described in
815 * Hale Landis's ATADRVR (www.ata-atapi.com), and
816 * later found its way into the ATA/ATAPI spec.
818 * Write a pattern to the ATA shadow registers,
819 * and if a device is present, it will respond by
820 * correctly storing and echoing back the
821 * ATA shadow register contents.
827 static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
829 struct ata_ioports *ioaddr = &ap->ioaddr;
832 ap->ops->dev_select(ap, device);
834 iowrite8(0x55, ioaddr->nsect_addr);
835 iowrite8(0xaa, ioaddr->lbal_addr);
837 iowrite8(0xaa, ioaddr->nsect_addr);
838 iowrite8(0x55, ioaddr->lbal_addr);
840 iowrite8(0x55, ioaddr->nsect_addr);
841 iowrite8(0xaa, ioaddr->lbal_addr);
843 nsect = ioread8(ioaddr->nsect_addr);
844 lbal = ioread8(ioaddr->lbal_addr);
846 if ((nsect == 0x55) && (lbal == 0xaa))
847 return 1; /* we found a device */
849 return 0; /* nothing found */
853 * ata_dev_classify - determine device type based on ATA-spec signature
854 * @tf: ATA taskfile register set for device to be identified
856 * Determine from taskfile register contents whether a device is
857 * ATA or ATAPI, as per "Signature and persistence" section
858 * of ATA/PI spec (volume 1, sect 5.14).
864 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
865 * %ATA_DEV_UNKNOWN the event of failure.
867 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
869 /* Apple's open source Darwin code hints that some devices only
870 * put a proper signature into the LBA mid/high registers,
871 * So, we only check those. It's sufficient for uniqueness.
873 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
874 * signatures for ATA and ATAPI devices attached on SerialATA,
875 * 0x3c/0xc3 and 0x69/0x96 respectively. However, SerialATA
876 * spec has never mentioned about using different signatures
877 * for ATA/ATAPI devices. Then, Serial ATA II: Port
878 * Multiplier specification began to use 0x69/0x96 to identify
879 * port multpliers and 0x3c/0xc3 to identify SEMB device.
880 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
881 * 0x69/0x96 shortly and described them as reserved for
884 * We follow the current spec and consider that 0x69/0x96
885 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
887 if ((tf->lbam == 0) && (tf->lbah == 0)) {
888 DPRINTK("found ATA device by sig\n");
892 if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
893 DPRINTK("found ATAPI device by sig\n");
894 return ATA_DEV_ATAPI;
897 if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
898 DPRINTK("found PMP device by sig\n");
902 if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
903 printk(KERN_INFO "ata: SEMB device ignored\n");
904 return ATA_DEV_SEMB_UNSUP; /* not yet */
907 DPRINTK("unknown device\n");
908 return ATA_DEV_UNKNOWN;
912 * ata_dev_try_classify - Parse returned ATA device signature
913 * @dev: ATA device to classify (starting at zero)
914 * @present: device seems present
915 * @r_err: Value of error register on completion
917 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
918 * an ATA/ATAPI-defined set of values is placed in the ATA
919 * shadow registers, indicating the results of device detection
922 * Select the ATA device, and read the values from the ATA shadow
923 * registers. Then parse according to the Error register value,
924 * and the spec-defined values examined by ata_dev_classify().
930 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
932 unsigned int ata_dev_try_classify(struct ata_device *dev, int present,
935 struct ata_port *ap = dev->link->ap;
936 struct ata_taskfile tf;
940 ap->ops->dev_select(ap, dev->devno);
942 memset(&tf, 0, sizeof(tf));
944 ap->ops->tf_read(ap, &tf);
949 /* see if device passed diags: if master then continue and warn later */
950 if (err == 0 && dev->devno == 0)
951 /* diagnostic fail : do nothing _YET_ */
952 dev->horkage |= ATA_HORKAGE_DIAGNOSTIC;
955 else if ((dev->devno == 0) && (err == 0x81))
960 /* determine if device is ATA or ATAPI */
961 class = ata_dev_classify(&tf);
963 if (class == ATA_DEV_UNKNOWN) {
964 /* If the device failed diagnostic, it's likely to
965 * have reported incorrect device signature too.
966 * Assume ATA device if the device seems present but
967 * device signature is invalid with diagnostic
970 if (present && (dev->horkage & ATA_HORKAGE_DIAGNOSTIC))
973 class = ATA_DEV_NONE;
974 } else if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
975 class = ATA_DEV_NONE;
981 * ata_id_string - Convert IDENTIFY DEVICE page into string
982 * @id: IDENTIFY DEVICE results we will examine
983 * @s: string into which data is output
984 * @ofs: offset into identify device page
985 * @len: length of string to return. must be an even number.
987 * The strings in the IDENTIFY DEVICE page are broken up into
988 * 16-bit chunks. Run through the string, and output each
989 * 8-bit chunk linearly, regardless of platform.
995 void ata_id_string(const u16 *id, unsigned char *s,
996 unsigned int ofs, unsigned int len)
1015 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1016 * @id: IDENTIFY DEVICE results we will examine
1017 * @s: string into which data is output
1018 * @ofs: offset into identify device page
1019 * @len: length of string to return. must be an odd number.
1021 * This function is identical to ata_id_string except that it
1022 * trims trailing spaces and terminates the resulting string with
1023 * null. @len must be actual maximum length (even number) + 1.
1028 void ata_id_c_string(const u16 *id, unsigned char *s,
1029 unsigned int ofs, unsigned int len)
1033 WARN_ON(!(len & 1));
1035 ata_id_string(id, s, ofs, len - 1);
1037 p = s + strnlen(s, len - 1);
1038 while (p > s && p[-1] == ' ')
1043 static u64 ata_id_n_sectors(const u16 *id)
1045 if (ata_id_has_lba(id)) {
1046 if (ata_id_has_lba48(id))
1047 return ata_id_u64(id, 100);
1049 return ata_id_u32(id, 60);
1051 if (ata_id_current_chs_valid(id))
1052 return ata_id_u32(id, 57);
1054 return id[1] * id[3] * id[6];
1058 static u64 ata_tf_to_lba48(struct ata_taskfile *tf)
1062 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
1063 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1064 sectors |= (tf->hob_lbal & 0xff) << 24;
1065 sectors |= (tf->lbah & 0xff) << 16;
1066 sectors |= (tf->lbam & 0xff) << 8;
1067 sectors |= (tf->lbal & 0xff);
1072 static u64 ata_tf_to_lba(struct ata_taskfile *tf)
1076 sectors |= (tf->device & 0x0f) << 24;
1077 sectors |= (tf->lbah & 0xff) << 16;
1078 sectors |= (tf->lbam & 0xff) << 8;
1079 sectors |= (tf->lbal & 0xff);
1085 * ata_read_native_max_address - Read native max address
1086 * @dev: target device
1087 * @max_sectors: out parameter for the result native max address
1089 * Perform an LBA48 or LBA28 native size query upon the device in
1093 * 0 on success, -EACCES if command is aborted by the drive.
1094 * -EIO on other errors.
1096 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
1098 unsigned int err_mask;
1099 struct ata_taskfile tf;
1100 int lba48 = ata_id_has_lba48(dev->id);
1102 ata_tf_init(dev, &tf);
1104 /* always clear all address registers */
1105 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1108 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
1109 tf.flags |= ATA_TFLAG_LBA48;
1111 tf.command = ATA_CMD_READ_NATIVE_MAX;
1113 tf.protocol |= ATA_PROT_NODATA;
1114 tf.device |= ATA_LBA;
1116 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1118 ata_dev_printk(dev, KERN_WARNING, "failed to read native "
1119 "max address (err_mask=0x%x)\n", err_mask);
1120 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
1126 *max_sectors = ata_tf_to_lba48(&tf);
1128 *max_sectors = ata_tf_to_lba(&tf);
1129 if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1135 * ata_set_max_sectors - Set max sectors
1136 * @dev: target device
1137 * @new_sectors: new max sectors value to set for the device
1139 * Set max sectors of @dev to @new_sectors.
1142 * 0 on success, -EACCES if command is aborted or denied (due to
1143 * previous non-volatile SET_MAX) by the drive. -EIO on other
1146 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
1148 unsigned int err_mask;
1149 struct ata_taskfile tf;
1150 int lba48 = ata_id_has_lba48(dev->id);
1154 ata_tf_init(dev, &tf);
1156 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1159 tf.command = ATA_CMD_SET_MAX_EXT;
1160 tf.flags |= ATA_TFLAG_LBA48;
1162 tf.hob_lbal = (new_sectors >> 24) & 0xff;
1163 tf.hob_lbam = (new_sectors >> 32) & 0xff;
1164 tf.hob_lbah = (new_sectors >> 40) & 0xff;
1166 tf.command = ATA_CMD_SET_MAX;
1168 tf.device |= (new_sectors >> 24) & 0xf;
1171 tf.protocol |= ATA_PROT_NODATA;
1172 tf.device |= ATA_LBA;
1174 tf.lbal = (new_sectors >> 0) & 0xff;
1175 tf.lbam = (new_sectors >> 8) & 0xff;
1176 tf.lbah = (new_sectors >> 16) & 0xff;
1178 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1180 ata_dev_printk(dev, KERN_WARNING, "failed to set "
1181 "max address (err_mask=0x%x)\n", err_mask);
1182 if (err_mask == AC_ERR_DEV &&
1183 (tf.feature & (ATA_ABORTED | ATA_IDNF)))
1192 * ata_hpa_resize - Resize a device with an HPA set
1193 * @dev: Device to resize
1195 * Read the size of an LBA28 or LBA48 disk with HPA features and resize
1196 * it if required to the full size of the media. The caller must check
1197 * the drive has the HPA feature set enabled.
1200 * 0 on success, -errno on failure.
1202 static int ata_hpa_resize(struct ata_device *dev)
1204 struct ata_eh_context *ehc = &dev->link->eh_context;
1205 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1206 u64 sectors = ata_id_n_sectors(dev->id);
1210 /* do we need to do it? */
1211 if (dev->class != ATA_DEV_ATA ||
1212 !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
1213 (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1216 /* read native max address */
1217 rc = ata_read_native_max_address(dev, &native_sectors);
1219 /* If HPA isn't going to be unlocked, skip HPA
1220 * resizing from the next try.
1222 if (!ata_ignore_hpa) {
1223 ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
1224 "broken, will skip HPA handling\n");
1225 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1227 /* we can continue if device aborted the command */
1235 /* nothing to do? */
1236 if (native_sectors <= sectors || !ata_ignore_hpa) {
1237 if (!print_info || native_sectors == sectors)
1240 if (native_sectors > sectors)
1241 ata_dev_printk(dev, KERN_INFO,
1242 "HPA detected: current %llu, native %llu\n",
1243 (unsigned long long)sectors,
1244 (unsigned long long)native_sectors);
1245 else if (native_sectors < sectors)
1246 ata_dev_printk(dev, KERN_WARNING,
1247 "native sectors (%llu) is smaller than "
1249 (unsigned long long)native_sectors,
1250 (unsigned long long)sectors);
1254 /* let's unlock HPA */
1255 rc = ata_set_max_sectors(dev, native_sectors);
1256 if (rc == -EACCES) {
1257 /* if device aborted the command, skip HPA resizing */
1258 ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
1259 "(%llu -> %llu), skipping HPA handling\n",
1260 (unsigned long long)sectors,
1261 (unsigned long long)native_sectors);
1262 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1267 /* re-read IDENTIFY data */
1268 rc = ata_dev_reread_id(dev, 0);
1270 ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
1271 "data after HPA resizing\n");
1276 u64 new_sectors = ata_id_n_sectors(dev->id);
1277 ata_dev_printk(dev, KERN_INFO,
1278 "HPA unlocked: %llu -> %llu, native %llu\n",
1279 (unsigned long long)sectors,
1280 (unsigned long long)new_sectors,
1281 (unsigned long long)native_sectors);
1288 * ata_id_to_dma_mode - Identify DMA mode from id block
1289 * @dev: device to identify
1290 * @unknown: mode to assume if we cannot tell
1292 * Set up the timing values for the device based upon the identify
1293 * reported values for the DMA mode. This function is used by drivers
1294 * which rely upon firmware configured modes, but wish to report the
1295 * mode correctly when possible.
1297 * In addition we emit similarly formatted messages to the default
1298 * ata_dev_set_mode handler, in order to provide consistency of
1302 void ata_id_to_dma_mode(struct ata_device *dev, u8 unknown)
1307 /* Pack the DMA modes */
1308 mask = ((dev->id[63] >> 8) << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA;
1309 if (dev->id[53] & 0x04)
1310 mask |= ((dev->id[88] >> 8) << ATA_SHIFT_UDMA) & ATA_MASK_UDMA;
1312 /* Select the mode in use */
1313 mode = ata_xfer_mask2mode(mask);
1316 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
1317 ata_mode_string(mask));
1319 /* SWDMA perhaps ? */
1321 ata_dev_printk(dev, KERN_INFO, "configured for DMA\n");
1324 /* Configure the device reporting */
1325 dev->xfer_mode = mode;
1326 dev->xfer_shift = ata_xfer_mode2shift(mode);
1330 * ata_noop_dev_select - Select device 0/1 on ATA bus
1331 * @ap: ATA channel to manipulate
1332 * @device: ATA device (numbered from zero) to select
1334 * This function performs no actual function.
1336 * May be used as the dev_select() entry in ata_port_operations.
1341 void ata_noop_dev_select(struct ata_port *ap, unsigned int device)
1347 * ata_std_dev_select - Select device 0/1 on ATA bus
1348 * @ap: ATA channel to manipulate
1349 * @device: ATA device (numbered from zero) to select
1351 * Use the method defined in the ATA specification to
1352 * make either device 0, or device 1, active on the
1353 * ATA channel. Works with both PIO and MMIO.
1355 * May be used as the dev_select() entry in ata_port_operations.
1361 void ata_std_dev_select(struct ata_port *ap, unsigned int device)
1366 tmp = ATA_DEVICE_OBS;
1368 tmp = ATA_DEVICE_OBS | ATA_DEV1;
1370 iowrite8(tmp, ap->ioaddr.device_addr);
1371 ata_pause(ap); /* needed; also flushes, for mmio */
1375 * ata_dev_select - Select device 0/1 on ATA bus
1376 * @ap: ATA channel to manipulate
1377 * @device: ATA device (numbered from zero) to select
1378 * @wait: non-zero to wait for Status register BSY bit to clear
1379 * @can_sleep: non-zero if context allows sleeping
1381 * Use the method defined in the ATA specification to
1382 * make either device 0, or device 1, active on the
1385 * This is a high-level version of ata_std_dev_select(),
1386 * which additionally provides the services of inserting
1387 * the proper pauses and status polling, where needed.
1393 void ata_dev_select(struct ata_port *ap, unsigned int device,
1394 unsigned int wait, unsigned int can_sleep)
1396 if (ata_msg_probe(ap))
1397 ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
1398 "device %u, wait %u\n", device, wait);
1403 ap->ops->dev_select(ap, device);
1406 if (can_sleep && ap->link.device[device].class == ATA_DEV_ATAPI)
1413 * ata_dump_id - IDENTIFY DEVICE info debugging output
1414 * @id: IDENTIFY DEVICE page to dump
1416 * Dump selected 16-bit words from the given IDENTIFY DEVICE
1423 static inline void ata_dump_id(const u16 *id)
1425 DPRINTK("49==0x%04x "
1435 DPRINTK("80==0x%04x "
1445 DPRINTK("88==0x%04x "
1452 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1453 * @id: IDENTIFY data to compute xfer mask from
1455 * Compute the xfermask for this device. This is not as trivial
1456 * as it seems if we must consider early devices correctly.
1458 * FIXME: pre IDE drive timing (do we care ?).
1466 static unsigned int ata_id_xfermask(const u16 *id)
1468 unsigned int pio_mask, mwdma_mask, udma_mask;
1470 /* Usual case. Word 53 indicates word 64 is valid */
1471 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1472 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1476 /* If word 64 isn't valid then Word 51 high byte holds
1477 * the PIO timing number for the maximum. Turn it into
1480 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1481 if (mode < 5) /* Valid PIO range */
1482 pio_mask = (2 << mode) - 1;
1486 /* But wait.. there's more. Design your standards by
1487 * committee and you too can get a free iordy field to
1488 * process. However its the speeds not the modes that
1489 * are supported... Note drivers using the timing API
1490 * will get this right anyway
1494 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1496 if (ata_id_is_cfa(id)) {
1498 * Process compact flash extended modes
1500 int pio = id[163] & 0x7;
1501 int dma = (id[163] >> 3) & 7;
1504 pio_mask |= (1 << 5);
1506 pio_mask |= (1 << 6);
1508 mwdma_mask |= (1 << 3);
1510 mwdma_mask |= (1 << 4);
1514 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1515 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1517 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1521 * ata_port_queue_task - Queue port_task
1522 * @ap: The ata_port to queue port_task for
1523 * @fn: workqueue function to be scheduled
1524 * @data: data for @fn to use
1525 * @delay: delay time for workqueue function
1527 * Schedule @fn(@data) for execution after @delay jiffies using
1528 * port_task. There is one port_task per port and it's the
1529 * user(low level driver)'s responsibility to make sure that only
1530 * one task is active at any given time.
1532 * libata core layer takes care of synchronization between
1533 * port_task and EH. ata_port_queue_task() may be ignored for EH
1537 * Inherited from caller.
1539 void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
1540 unsigned long delay)
1542 PREPARE_DELAYED_WORK(&ap->port_task, fn);
1543 ap->port_task_data = data;
1545 /* may fail if ata_port_flush_task() in progress */
1546 queue_delayed_work(ata_wq, &ap->port_task, delay);
1550 * ata_port_flush_task - Flush port_task
1551 * @ap: The ata_port to flush port_task for
1553 * After this function completes, port_task is guranteed not to
1554 * be running or scheduled.
1557 * Kernel thread context (may sleep)
1559 void ata_port_flush_task(struct ata_port *ap)
1563 cancel_rearming_delayed_work(&ap->port_task);
1565 if (ata_msg_ctl(ap))
1566 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
1569 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1571 struct completion *waiting = qc->private_data;
1577 * ata_exec_internal_sg - execute libata internal command
1578 * @dev: Device to which the command is sent
1579 * @tf: Taskfile registers for the command and the result
1580 * @cdb: CDB for packet command
1581 * @dma_dir: Data tranfer direction of the command
1582 * @sgl: sg list for the data buffer of the command
1583 * @n_elem: Number of sg entries
1584 * @timeout: Timeout in msecs (0 for default)
1586 * Executes libata internal command with timeout. @tf contains
1587 * command on entry and result on return. Timeout and error
1588 * conditions are reported via return value. No recovery action
1589 * is taken after a command times out. It's caller's duty to
1590 * clean up after timeout.
1593 * None. Should be called with kernel context, might sleep.
1596 * Zero on success, AC_ERR_* mask on failure
1598 unsigned ata_exec_internal_sg(struct ata_device *dev,
1599 struct ata_taskfile *tf, const u8 *cdb,
1600 int dma_dir, struct scatterlist *sgl,
1601 unsigned int n_elem, unsigned long timeout)
1603 struct ata_link *link = dev->link;
1604 struct ata_port *ap = link->ap;
1605 u8 command = tf->command;
1606 struct ata_queued_cmd *qc;
1607 unsigned int tag, preempted_tag;
1608 u32 preempted_sactive, preempted_qc_active;
1609 int preempted_nr_active_links;
1610 DECLARE_COMPLETION_ONSTACK(wait);
1611 unsigned long flags;
1612 unsigned int err_mask;
1615 spin_lock_irqsave(ap->lock, flags);
1617 /* no internal command while frozen */
1618 if (ap->pflags & ATA_PFLAG_FROZEN) {
1619 spin_unlock_irqrestore(ap->lock, flags);
1620 return AC_ERR_SYSTEM;
1623 /* initialize internal qc */
1625 /* XXX: Tag 0 is used for drivers with legacy EH as some
1626 * drivers choke if any other tag is given. This breaks
1627 * ata_tag_internal() test for those drivers. Don't use new
1628 * EH stuff without converting to it.
1630 if (ap->ops->error_handler)
1631 tag = ATA_TAG_INTERNAL;
1635 if (test_and_set_bit(tag, &ap->qc_allocated))
1637 qc = __ata_qc_from_tag(ap, tag);
1645 preempted_tag = link->active_tag;
1646 preempted_sactive = link->sactive;
1647 preempted_qc_active = ap->qc_active;
1648 preempted_nr_active_links = ap->nr_active_links;
1649 link->active_tag = ATA_TAG_POISON;
1652 ap->nr_active_links = 0;
1654 /* prepare & issue qc */
1657 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1658 qc->flags |= ATA_QCFLAG_RESULT_TF;
1659 qc->dma_dir = dma_dir;
1660 if (dma_dir != DMA_NONE) {
1661 unsigned int i, buflen = 0;
1662 struct scatterlist *sg;
1664 for_each_sg(sgl, sg, n_elem, i)
1665 buflen += sg->length;
1667 ata_sg_init(qc, sgl, n_elem);
1668 qc->nbytes = buflen;
1671 qc->private_data = &wait;
1672 qc->complete_fn = ata_qc_complete_internal;
1676 spin_unlock_irqrestore(ap->lock, flags);
1679 timeout = ata_probe_timeout * 1000 / HZ;
1681 rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1683 ata_port_flush_task(ap);
1686 spin_lock_irqsave(ap->lock, flags);
1688 /* We're racing with irq here. If we lose, the
1689 * following test prevents us from completing the qc
1690 * twice. If we win, the port is frozen and will be
1691 * cleaned up by ->post_internal_cmd().
1693 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1694 qc->err_mask |= AC_ERR_TIMEOUT;
1696 if (ap->ops->error_handler)
1697 ata_port_freeze(ap);
1699 ata_qc_complete(qc);
1701 if (ata_msg_warn(ap))
1702 ata_dev_printk(dev, KERN_WARNING,
1703 "qc timeout (cmd 0x%x)\n", command);
1706 spin_unlock_irqrestore(ap->lock, flags);
1709 /* do post_internal_cmd */
1710 if (ap->ops->post_internal_cmd)
1711 ap->ops->post_internal_cmd(qc);
1713 /* perform minimal error analysis */
1714 if (qc->flags & ATA_QCFLAG_FAILED) {
1715 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1716 qc->err_mask |= AC_ERR_DEV;
1719 qc->err_mask |= AC_ERR_OTHER;
1721 if (qc->err_mask & ~AC_ERR_OTHER)
1722 qc->err_mask &= ~AC_ERR_OTHER;
1726 spin_lock_irqsave(ap->lock, flags);
1728 *tf = qc->result_tf;
1729 err_mask = qc->err_mask;
1732 link->active_tag = preempted_tag;
1733 link->sactive = preempted_sactive;
1734 ap->qc_active = preempted_qc_active;
1735 ap->nr_active_links = preempted_nr_active_links;
1737 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1738 * Until those drivers are fixed, we detect the condition
1739 * here, fail the command with AC_ERR_SYSTEM and reenable the
1742 * Note that this doesn't change any behavior as internal
1743 * command failure results in disabling the device in the
1744 * higher layer for LLDDs without new reset/EH callbacks.
1746 * Kill the following code as soon as those drivers are fixed.
1748 if (ap->flags & ATA_FLAG_DISABLED) {
1749 err_mask |= AC_ERR_SYSTEM;
1753 spin_unlock_irqrestore(ap->lock, flags);
1759 * ata_exec_internal - execute libata internal command
1760 * @dev: Device to which the command is sent
1761 * @tf: Taskfile registers for the command and the result
1762 * @cdb: CDB for packet command
1763 * @dma_dir: Data tranfer direction of the command
1764 * @buf: Data buffer of the command
1765 * @buflen: Length of data buffer
1766 * @timeout: Timeout in msecs (0 for default)
1768 * Wrapper around ata_exec_internal_sg() which takes simple
1769 * buffer instead of sg list.
1772 * None. Should be called with kernel context, might sleep.
1775 * Zero on success, AC_ERR_* mask on failure
1777 unsigned ata_exec_internal(struct ata_device *dev,
1778 struct ata_taskfile *tf, const u8 *cdb,
1779 int dma_dir, void *buf, unsigned int buflen,
1780 unsigned long timeout)
1782 struct scatterlist *psg = NULL, sg;
1783 unsigned int n_elem = 0;
1785 if (dma_dir != DMA_NONE) {
1787 sg_init_one(&sg, buf, buflen);
1792 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
1797 * ata_do_simple_cmd - execute simple internal command
1798 * @dev: Device to which the command is sent
1799 * @cmd: Opcode to execute
1801 * Execute a 'simple' command, that only consists of the opcode
1802 * 'cmd' itself, without filling any other registers
1805 * Kernel thread context (may sleep).
1808 * Zero on success, AC_ERR_* mask on failure
1810 unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1812 struct ata_taskfile tf;
1814 ata_tf_init(dev, &tf);
1817 tf.flags |= ATA_TFLAG_DEVICE;
1818 tf.protocol = ATA_PROT_NODATA;
1820 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1824 * ata_pio_need_iordy - check if iordy needed
1827 * Check if the current speed of the device requires IORDY. Used
1828 * by various controllers for chip configuration.
1831 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1833 /* Controller doesn't support IORDY. Probably a pointless check
1834 as the caller should know this */
1835 if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1837 /* PIO3 and higher it is mandatory */
1838 if (adev->pio_mode > XFER_PIO_2)
1840 /* We turn it on when possible */
1841 if (ata_id_has_iordy(adev->id))
1847 * ata_pio_mask_no_iordy - Return the non IORDY mask
1850 * Compute the highest mode possible if we are not using iordy. Return
1851 * -1 if no iordy mode is available.
1854 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1856 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1857 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1858 u16 pio = adev->id[ATA_ID_EIDE_PIO];
1859 /* Is the speed faster than the drive allows non IORDY ? */
1861 /* This is cycle times not frequency - watch the logic! */
1862 if (pio > 240) /* PIO2 is 240nS per cycle */
1863 return 3 << ATA_SHIFT_PIO;
1864 return 7 << ATA_SHIFT_PIO;
1867 return 3 << ATA_SHIFT_PIO;
1871 * ata_dev_read_id - Read ID data from the specified device
1872 * @dev: target device
1873 * @p_class: pointer to class of the target device (may be changed)
1874 * @flags: ATA_READID_* flags
1875 * @id: buffer to read IDENTIFY data into
1877 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1878 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1879 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1880 * for pre-ATA4 drives.
1882 * FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1883 * now we abort if we hit that case.
1886 * Kernel thread context (may sleep)
1889 * 0 on success, -errno otherwise.
1891 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1892 unsigned int flags, u16 *id)
1894 struct ata_port *ap = dev->link->ap;
1895 unsigned int class = *p_class;
1896 struct ata_taskfile tf;
1897 unsigned int err_mask = 0;
1899 int may_fallback = 1, tried_spinup = 0;
1902 if (ata_msg_ctl(ap))
1903 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
1905 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1907 ata_tf_init(dev, &tf);
1911 tf.command = ATA_CMD_ID_ATA;
1914 tf.command = ATA_CMD_ID_ATAPI;
1918 reason = "unsupported class";
1922 tf.protocol = ATA_PROT_PIO;
1924 /* Some devices choke if TF registers contain garbage. Make
1925 * sure those are properly initialized.
1927 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1929 /* Device presence detection is unreliable on some
1930 * controllers. Always poll IDENTIFY if available.
1932 tf.flags |= ATA_TFLAG_POLLING;
1934 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1935 id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1937 if (err_mask & AC_ERR_NODEV_HINT) {
1938 DPRINTK("ata%u.%d: NODEV after polling detection\n",
1939 ap->print_id, dev->devno);
1943 /* Device or controller might have reported the wrong
1944 * device class. Give a shot at the other IDENTIFY if
1945 * the current one is aborted by the device.
1948 (err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
1951 if (class == ATA_DEV_ATA)
1952 class = ATA_DEV_ATAPI;
1954 class = ATA_DEV_ATA;
1959 reason = "I/O error";
1963 /* Falling back doesn't make sense if ID data was read
1964 * successfully at least once.
1968 swap_buf_le16(id, ATA_ID_WORDS);
1972 reason = "device reports invalid type";
1974 if (class == ATA_DEV_ATA) {
1975 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1978 if (ata_id_is_ata(id))
1982 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
1985 * Drive powered-up in standby mode, and requires a specific
1986 * SET_FEATURES spin-up subcommand before it will accept
1987 * anything other than the original IDENTIFY command.
1989 err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
1990 if (err_mask && id[2] != 0x738c) {
1992 reason = "SPINUP failed";
1996 * If the drive initially returned incomplete IDENTIFY info,
1997 * we now must reissue the IDENTIFY command.
1999 if (id[2] == 0x37c8)
2003 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2005 * The exact sequence expected by certain pre-ATA4 drives is:
2007 * IDENTIFY (optional in early ATA)
2008 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2010 * Some drives were very specific about that exact sequence.
2012 * Note that ATA4 says lba is mandatory so the second check
2013 * shoud never trigger.
2015 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
2016 err_mask = ata_dev_init_params(dev, id[3], id[6]);
2019 reason = "INIT_DEV_PARAMS failed";
2023 /* current CHS translation info (id[53-58]) might be
2024 * changed. reread the identify device info.
2026 flags &= ~ATA_READID_POSTRESET;
2036 if (ata_msg_warn(ap))
2037 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
2038 "(%s, err_mask=0x%x)\n", reason, err_mask);
2042 static inline u8 ata_dev_knobble(struct ata_device *dev)
2044 struct ata_port *ap = dev->link->ap;
2045 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2048 static void ata_dev_config_ncq(struct ata_device *dev,
2049 char *desc, size_t desc_sz)
2051 struct ata_port *ap = dev->link->ap;
2052 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2054 if (!ata_id_has_ncq(dev->id)) {
2058 if (dev->horkage & ATA_HORKAGE_NONCQ) {
2059 snprintf(desc, desc_sz, "NCQ (not used)");
2062 if (ap->flags & ATA_FLAG_NCQ) {
2063 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2064 dev->flags |= ATA_DFLAG_NCQ;
2067 if (hdepth >= ddepth)
2068 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
2070 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
2074 * ata_dev_configure - Configure the specified ATA/ATAPI device
2075 * @dev: Target device to configure
2077 * Configure @dev according to @dev->id. Generic and low-level
2078 * driver specific fixups are also applied.
2081 * Kernel thread context (may sleep)
2084 * 0 on success, -errno otherwise
2086 int ata_dev_configure(struct ata_device *dev)
2088 struct ata_port *ap = dev->link->ap;
2089 struct ata_eh_context *ehc = &dev->link->eh_context;
2090 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2091 const u16 *id = dev->id;
2092 unsigned int xfer_mask;
2093 char revbuf[7]; /* XYZ-99\0 */
2094 char fwrevbuf[ATA_ID_FW_REV_LEN+1];
2095 char modelbuf[ATA_ID_PROD_LEN+1];
2098 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2099 ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2104 if (ata_msg_probe(ap))
2105 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
2108 dev->horkage |= ata_dev_blacklisted(dev);
2110 /* let ACPI work its magic */
2111 rc = ata_acpi_on_devcfg(dev);
2115 /* massage HPA, do it early as it might change IDENTIFY data */
2116 rc = ata_hpa_resize(dev);
2120 /* print device capabilities */
2121 if (ata_msg_probe(ap))
2122 ata_dev_printk(dev, KERN_DEBUG,
2123 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
2124 "85:%04x 86:%04x 87:%04x 88:%04x\n",
2126 id[49], id[82], id[83], id[84],
2127 id[85], id[86], id[87], id[88]);
2129 /* initialize to-be-configured parameters */
2130 dev->flags &= ~ATA_DFLAG_CFG_MASK;
2131 dev->max_sectors = 0;
2139 * common ATA, ATAPI feature tests
2142 /* find max transfer mode; for printk only */
2143 xfer_mask = ata_id_xfermask(id);
2145 if (ata_msg_probe(ap))
2148 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
2149 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
2152 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
2155 /* ATA-specific feature tests */
2156 if (dev->class == ATA_DEV_ATA) {
2157 if (ata_id_is_cfa(id)) {
2158 if (id[162] & 1) /* CPRM may make this media unusable */
2159 ata_dev_printk(dev, KERN_WARNING,
2160 "supports DRM functions and may "
2161 "not be fully accessable.\n");
2162 snprintf(revbuf, 7, "CFA");
2164 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2166 dev->n_sectors = ata_id_n_sectors(id);
2168 if (dev->id[59] & 0x100)
2169 dev->multi_count = dev->id[59] & 0xff;
2171 if (ata_id_has_lba(id)) {
2172 const char *lba_desc;
2176 dev->flags |= ATA_DFLAG_LBA;
2177 if (ata_id_has_lba48(id)) {
2178 dev->flags |= ATA_DFLAG_LBA48;
2181 if (dev->n_sectors >= (1UL << 28) &&
2182 ata_id_has_flush_ext(id))
2183 dev->flags |= ATA_DFLAG_FLUSH_EXT;
2187 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
2189 /* print device info to dmesg */
2190 if (ata_msg_drv(ap) && print_info) {
2191 ata_dev_printk(dev, KERN_INFO,
2192 "%s: %s, %s, max %s\n",
2193 revbuf, modelbuf, fwrevbuf,
2194 ata_mode_string(xfer_mask));
2195 ata_dev_printk(dev, KERN_INFO,
2196 "%Lu sectors, multi %u: %s %s\n",
2197 (unsigned long long)dev->n_sectors,
2198 dev->multi_count, lba_desc, ncq_desc);
2203 /* Default translation */
2204 dev->cylinders = id[1];
2206 dev->sectors = id[6];
2208 if (ata_id_current_chs_valid(id)) {
2209 /* Current CHS translation is valid. */
2210 dev->cylinders = id[54];
2211 dev->heads = id[55];
2212 dev->sectors = id[56];
2215 /* print device info to dmesg */
2216 if (ata_msg_drv(ap) && print_info) {
2217 ata_dev_printk(dev, KERN_INFO,
2218 "%s: %s, %s, max %s\n",
2219 revbuf, modelbuf, fwrevbuf,
2220 ata_mode_string(xfer_mask));
2221 ata_dev_printk(dev, KERN_INFO,
2222 "%Lu sectors, multi %u, CHS %u/%u/%u\n",
2223 (unsigned long long)dev->n_sectors,
2224 dev->multi_count, dev->cylinders,
2225 dev->heads, dev->sectors);
2232 /* ATAPI-specific feature tests */
2233 else if (dev->class == ATA_DEV_ATAPI) {
2234 const char *cdb_intr_string = "";
2235 const char *atapi_an_string = "";
2238 rc = atapi_cdb_len(id);
2239 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2240 if (ata_msg_warn(ap))
2241 ata_dev_printk(dev, KERN_WARNING,
2242 "unsupported CDB len\n");
2246 dev->cdb_len = (unsigned int) rc;
2248 /* Enable ATAPI AN if both the host and device have
2249 * the support. If PMP is attached, SNTF is required
2250 * to enable ATAPI AN to discern between PHY status
2251 * changed notifications and ATAPI ANs.
2253 if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
2254 (!ap->nr_pmp_links ||
2255 sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2256 unsigned int err_mask;
2258 /* issue SET feature command to turn this on */
2259 err_mask = ata_dev_set_feature(dev,
2260 SETFEATURES_SATA_ENABLE, SATA_AN);
2262 ata_dev_printk(dev, KERN_ERR,
2263 "failed to enable ATAPI AN "
2264 "(err_mask=0x%x)\n", err_mask);
2266 dev->flags |= ATA_DFLAG_AN;
2267 atapi_an_string = ", ATAPI AN";
2271 if (ata_id_cdb_intr(dev->id)) {
2272 dev->flags |= ATA_DFLAG_CDB_INTR;
2273 cdb_intr_string = ", CDB intr";
2276 /* print device info to dmesg */
2277 if (ata_msg_drv(ap) && print_info)
2278 ata_dev_printk(dev, KERN_INFO,
2279 "ATAPI: %s, %s, max %s%s%s\n",
2281 ata_mode_string(xfer_mask),
2282 cdb_intr_string, atapi_an_string);
2285 /* determine max_sectors */
2286 dev->max_sectors = ATA_MAX_SECTORS;
2287 if (dev->flags & ATA_DFLAG_LBA48)
2288 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2290 if (!(dev->horkage & ATA_HORKAGE_IPM)) {
2291 if (ata_id_has_hipm(dev->id))
2292 dev->flags |= ATA_DFLAG_HIPM;
2293 if (ata_id_has_dipm(dev->id))
2294 dev->flags |= ATA_DFLAG_DIPM;
2297 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2298 /* Let the user know. We don't want to disallow opens for
2299 rescue purposes, or in case the vendor is just a blithering
2302 ata_dev_printk(dev, KERN_WARNING,
2303 "Drive reports diagnostics failure. This may indicate a drive\n");
2304 ata_dev_printk(dev, KERN_WARNING,
2305 "fault or invalid emulation. Contact drive vendor for information.\n");
2309 /* limit bridge transfers to udma5, 200 sectors */
2310 if (ata_dev_knobble(dev)) {
2311 if (ata_msg_drv(ap) && print_info)
2312 ata_dev_printk(dev, KERN_INFO,
2313 "applying bridge limits\n");
2314 dev->udma_mask &= ATA_UDMA5;
2315 dev->max_sectors = ATA_MAX_SECTORS;
2318 if ((dev->class == ATA_DEV_ATAPI) &&
2319 (atapi_command_packet_set(id) == TYPE_TAPE)) {
2320 dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2321 dev->horkage |= ATA_HORKAGE_STUCK_ERR;
2324 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2325 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2328 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
2329 dev->horkage |= ATA_HORKAGE_IPM;
2331 /* reset link pm_policy for this port to no pm */
2332 ap->pm_policy = MAX_PERFORMANCE;
2335 if (ap->ops->dev_config)
2336 ap->ops->dev_config(dev);
2338 if (ata_msg_probe(ap))
2339 ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
2340 __FUNCTION__, ata_chk_status(ap));
2344 if (ata_msg_probe(ap))
2345 ata_dev_printk(dev, KERN_DEBUG,
2346 "%s: EXIT, err\n", __FUNCTION__);
2351 * ata_cable_40wire - return 40 wire cable type
2354 * Helper method for drivers which want to hardwire 40 wire cable
2358 int ata_cable_40wire(struct ata_port *ap)
2360 return ATA_CBL_PATA40;
2364 * ata_cable_80wire - return 80 wire cable type
2367 * Helper method for drivers which want to hardwire 80 wire cable
2371 int ata_cable_80wire(struct ata_port *ap)
2373 return ATA_CBL_PATA80;
2377 * ata_cable_unknown - return unknown PATA cable.
2380 * Helper method for drivers which have no PATA cable detection.
2383 int ata_cable_unknown(struct ata_port *ap)
2385 return ATA_CBL_PATA_UNK;
2389 * ata_cable_sata - return SATA cable type
2392 * Helper method for drivers which have SATA cables
2395 int ata_cable_sata(struct ata_port *ap)
2397 return ATA_CBL_SATA;
2401 * ata_bus_probe - Reset and probe ATA bus
2404 * Master ATA bus probing function. Initiates a hardware-dependent
2405 * bus reset, then attempts to identify any devices found on
2409 * PCI/etc. bus probe sem.
2412 * Zero on success, negative errno otherwise.
2415 int ata_bus_probe(struct ata_port *ap)
2417 unsigned int classes[ATA_MAX_DEVICES];
2418 int tries[ATA_MAX_DEVICES];
2420 struct ata_device *dev;
2424 ata_link_for_each_dev(dev, &ap->link)
2425 tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2428 ata_link_for_each_dev(dev, &ap->link) {
2429 /* If we issue an SRST then an ATA drive (not ATAPI)
2430 * may change configuration and be in PIO0 timing. If
2431 * we do a hard reset (or are coming from power on)
2432 * this is true for ATA or ATAPI. Until we've set a
2433 * suitable controller mode we should not touch the
2434 * bus as we may be talking too fast.
2436 dev->pio_mode = XFER_PIO_0;
2438 /* If the controller has a pio mode setup function
2439 * then use it to set the chipset to rights. Don't
2440 * touch the DMA setup as that will be dealt with when
2441 * configuring devices.
2443 if (ap->ops->set_piomode)
2444 ap->ops->set_piomode(ap, dev);
2447 /* reset and determine device classes */
2448 ap->ops->phy_reset(ap);
2450 ata_link_for_each_dev(dev, &ap->link) {
2451 if (!(ap->flags & ATA_FLAG_DISABLED) &&
2452 dev->class != ATA_DEV_UNKNOWN)
2453 classes[dev->devno] = dev->class;
2455 classes[dev->devno] = ATA_DEV_NONE;
2457 dev->class = ATA_DEV_UNKNOWN;
2462 /* read IDENTIFY page and configure devices. We have to do the identify
2463 specific sequence bass-ackwards so that PDIAG- is released by
2466 ata_link_for_each_dev(dev, &ap->link) {
2467 if (tries[dev->devno])
2468 dev->class = classes[dev->devno];
2470 if (!ata_dev_enabled(dev))
2473 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2479 /* Now ask for the cable type as PDIAG- should have been released */
2480 if (ap->ops->cable_detect)
2481 ap->cbl = ap->ops->cable_detect(ap);
2483 /* We may have SATA bridge glue hiding here irrespective of the
2484 reported cable types and sensed types */
2485 ata_link_for_each_dev(dev, &ap->link) {
2486 if (!ata_dev_enabled(dev))
2488 /* SATA drives indicate we have a bridge. We don't know which
2489 end of the link the bridge is which is a problem */
2490 if (ata_id_is_sata(dev->id))
2491 ap->cbl = ATA_CBL_SATA;
2494 /* After the identify sequence we can now set up the devices. We do
2495 this in the normal order so that the user doesn't get confused */
2497 ata_link_for_each_dev(dev, &ap->link) {
2498 if (!ata_dev_enabled(dev))
2501 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2502 rc = ata_dev_configure(dev);
2503 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2508 /* configure transfer mode */
2509 rc = ata_set_mode(&ap->link, &dev);
2513 ata_link_for_each_dev(dev, &ap->link)
2514 if (ata_dev_enabled(dev))
2517 /* no device present, disable port */
2518 ata_port_disable(ap);
2522 tries[dev->devno]--;
2526 /* eeek, something went very wrong, give up */
2527 tries[dev->devno] = 0;
2531 /* give it just one more chance */
2532 tries[dev->devno] = min(tries[dev->devno], 1);
2534 if (tries[dev->devno] == 1) {
2535 /* This is the last chance, better to slow
2536 * down than lose it.
2538 sata_down_spd_limit(&ap->link);
2539 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2543 if (!tries[dev->devno])
2544 ata_dev_disable(dev);
2550 * ata_port_probe - Mark port as enabled
2551 * @ap: Port for which we indicate enablement
2553 * Modify @ap data structure such that the system
2554 * thinks that the entire port is enabled.
2556 * LOCKING: host lock, or some other form of
2560 void ata_port_probe(struct ata_port *ap)
2562 ap->flags &= ~ATA_FLAG_DISABLED;
2566 * sata_print_link_status - Print SATA link status
2567 * @link: SATA link to printk link status about
2569 * This function prints link speed and status of a SATA link.
2574 void sata_print_link_status(struct ata_link *link)
2576 u32 sstatus, scontrol, tmp;
2578 if (sata_scr_read(link, SCR_STATUS, &sstatus))
2580 sata_scr_read(link, SCR_CONTROL, &scontrol);
2582 if (ata_link_online(link)) {
2583 tmp = (sstatus >> 4) & 0xf;
2584 ata_link_printk(link, KERN_INFO,
2585 "SATA link up %s (SStatus %X SControl %X)\n",
2586 sata_spd_string(tmp), sstatus, scontrol);
2588 ata_link_printk(link, KERN_INFO,
2589 "SATA link down (SStatus %X SControl %X)\n",
2595 * ata_dev_pair - return other device on cable
2598 * Obtain the other device on the same cable, or if none is
2599 * present NULL is returned
2602 struct ata_device *ata_dev_pair(struct ata_device *adev)
2604 struct ata_link *link = adev->link;
2605 struct ata_device *pair = &link->device[1 - adev->devno];
2606 if (!ata_dev_enabled(pair))
2612 * ata_port_disable - Disable port.
2613 * @ap: Port to be disabled.
2615 * Modify @ap data structure such that the system
2616 * thinks that the entire port is disabled, and should
2617 * never attempt to probe or communicate with devices
2620 * LOCKING: host lock, or some other form of
2624 void ata_port_disable(struct ata_port *ap)
2626 ap->link.device[0].class = ATA_DEV_NONE;
2627 ap->link.device[1].class = ATA_DEV_NONE;
2628 ap->flags |= ATA_FLAG_DISABLED;
2632 * sata_down_spd_limit - adjust SATA spd limit downward
2633 * @link: Link to adjust SATA spd limit for
2635 * Adjust SATA spd limit of @link downward. Note that this
2636 * function only adjusts the limit. The change must be applied
2637 * using sata_set_spd().
2640 * Inherited from caller.
2643 * 0 on success, negative errno on failure
2645 int sata_down_spd_limit(struct ata_link *link)
2647 u32 sstatus, spd, mask;
2650 if (!sata_scr_valid(link))
2653 /* If SCR can be read, use it to determine the current SPD.
2654 * If not, use cached value in link->sata_spd.
2656 rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2658 spd = (sstatus >> 4) & 0xf;
2660 spd = link->sata_spd;
2662 mask = link->sata_spd_limit;
2666 /* unconditionally mask off the highest bit */
2667 highbit = fls(mask) - 1;
2668 mask &= ~(1 << highbit);
2670 /* Mask off all speeds higher than or equal to the current
2671 * one. Force 1.5Gbps if current SPD is not available.
2674 mask &= (1 << (spd - 1)) - 1;
2678 /* were we already at the bottom? */
2682 link->sata_spd_limit = mask;
2684 ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2685 sata_spd_string(fls(mask)));
2690 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2692 struct ata_link *host_link = &link->ap->link;
2693 u32 limit, target, spd;
2695 limit = link->sata_spd_limit;
2697 /* Don't configure downstream link faster than upstream link.
2698 * It doesn't speed up anything and some PMPs choke on such
2701 if (!ata_is_host_link(link) && host_link->sata_spd)
2702 limit &= (1 << host_link->sata_spd) - 1;
2704 if (limit == UINT_MAX)
2707 target = fls(limit);
2709 spd = (*scontrol >> 4) & 0xf;
2710 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2712 return spd != target;
2716 * sata_set_spd_needed - is SATA spd configuration needed
2717 * @link: Link in question
2719 * Test whether the spd limit in SControl matches
2720 * @link->sata_spd_limit. This function is used to determine
2721 * whether hardreset is necessary to apply SATA spd
2725 * Inherited from caller.
2728 * 1 if SATA spd configuration is needed, 0 otherwise.
2730 int sata_set_spd_needed(struct ata_link *link)
2734 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2737 return __sata_set_spd_needed(link, &scontrol);
2741 * sata_set_spd - set SATA spd according to spd limit
2742 * @link: Link to set SATA spd for
2744 * Set SATA spd of @link according to sata_spd_limit.
2747 * Inherited from caller.
2750 * 0 if spd doesn't need to be changed, 1 if spd has been
2751 * changed. Negative errno if SCR registers are inaccessible.
2753 int sata_set_spd(struct ata_link *link)
2758 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2761 if (!__sata_set_spd_needed(link, &scontrol))
2764 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2771 * This mode timing computation functionality is ported over from
2772 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
2775 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
2776 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2777 * for UDMA6, which is currently supported only by Maxtor drives.
2779 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
2782 static const struct ata_timing ata_timing[] = {
2784 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
2785 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
2786 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
2787 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
2789 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
2790 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 },
2791 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
2792 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
2793 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
2795 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
2797 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
2798 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
2799 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
2801 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
2802 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
2803 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
2805 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
2806 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
2807 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
2808 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
2810 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
2811 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
2812 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
2814 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
2819 #define ENOUGH(v, unit) (((v)-1)/(unit)+1)
2820 #define EZ(v, unit) ((v)?ENOUGH(v, unit):0)
2822 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
2824 q->setup = EZ(t->setup * 1000, T);
2825 q->act8b = EZ(t->act8b * 1000, T);
2826 q->rec8b = EZ(t->rec8b * 1000, T);
2827 q->cyc8b = EZ(t->cyc8b * 1000, T);
2828 q->active = EZ(t->active * 1000, T);
2829 q->recover = EZ(t->recover * 1000, T);
2830 q->cycle = EZ(t->cycle * 1000, T);
2831 q->udma = EZ(t->udma * 1000, UT);
2834 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
2835 struct ata_timing *m, unsigned int what)
2837 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
2838 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
2839 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
2840 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
2841 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
2842 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
2843 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
2844 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
2847 static const struct ata_timing *ata_timing_find_mode(unsigned short speed)
2849 const struct ata_timing *t;
2851 for (t = ata_timing; t->mode != speed; t++)
2852 if (t->mode == 0xFF)
2857 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
2858 struct ata_timing *t, int T, int UT)
2860 const struct ata_timing *s;
2861 struct ata_timing p;
2867 if (!(s = ata_timing_find_mode(speed)))
2870 memcpy(t, s, sizeof(*s));
2873 * If the drive is an EIDE drive, it can tell us it needs extended
2874 * PIO/MW_DMA cycle timing.
2877 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
2878 memset(&p, 0, sizeof(p));
2879 if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
2880 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
2881 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
2882 } else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
2883 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
2885 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
2889 * Convert the timing to bus clock counts.
2892 ata_timing_quantize(t, t, T, UT);
2895 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2896 * S.M.A.R.T * and some other commands. We have to ensure that the
2897 * DMA cycle timing is slower/equal than the fastest PIO timing.
2900 if (speed > XFER_PIO_6) {
2901 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
2902 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
2906 * Lengthen active & recovery time so that cycle time is correct.
2909 if (t->act8b + t->rec8b < t->cyc8b) {
2910 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
2911 t->rec8b = t->cyc8b - t->act8b;
2914 if (t->active + t->recover < t->cycle) {
2915 t->active += (t->cycle - (t->active + t->recover)) / 2;
2916 t->recover = t->cycle - t->active;
2919 /* In a few cases quantisation may produce enough errors to
2920 leave t->cycle too low for the sum of active and recovery
2921 if so we must correct this */
2922 if (t->active + t->recover > t->cycle)
2923 t->cycle = t->active + t->recover;
2929 * ata_down_xfermask_limit - adjust dev xfer masks downward
2930 * @dev: Device to adjust xfer masks
2931 * @sel: ATA_DNXFER_* selector
2933 * Adjust xfer masks of @dev downward. Note that this function
2934 * does not apply the change. Invoking ata_set_mode() afterwards
2935 * will apply the limit.
2938 * Inherited from caller.
2941 * 0 on success, negative errno on failure
2943 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2946 unsigned int orig_mask, xfer_mask;
2947 unsigned int pio_mask, mwdma_mask, udma_mask;
2950 quiet = !!(sel & ATA_DNXFER_QUIET);
2951 sel &= ~ATA_DNXFER_QUIET;
2953 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
2956 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
2959 case ATA_DNXFER_PIO:
2960 highbit = fls(pio_mask) - 1;
2961 pio_mask &= ~(1 << highbit);
2964 case ATA_DNXFER_DMA:
2966 highbit = fls(udma_mask) - 1;
2967 udma_mask &= ~(1 << highbit);
2970 } else if (mwdma_mask) {
2971 highbit = fls(mwdma_mask) - 1;
2972 mwdma_mask &= ~(1 << highbit);
2978 case ATA_DNXFER_40C:
2979 udma_mask &= ATA_UDMA_MASK_40C;
2982 case ATA_DNXFER_FORCE_PIO0:
2984 case ATA_DNXFER_FORCE_PIO:
2993 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
2995 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
2999 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
3000 snprintf(buf, sizeof(buf), "%s:%s",
3001 ata_mode_string(xfer_mask),
3002 ata_mode_string(xfer_mask & ATA_MASK_PIO));
3004 snprintf(buf, sizeof(buf), "%s",
3005 ata_mode_string(xfer_mask));
3007 ata_dev_printk(dev, KERN_WARNING,
3008 "limiting speed to %s\n", buf);
3011 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
3017 static int ata_dev_set_mode(struct ata_device *dev)
3019 struct ata_eh_context *ehc = &dev->link->eh_context;
3020 unsigned int err_mask;
3023 dev->flags &= ~ATA_DFLAG_PIO;
3024 if (dev->xfer_shift == ATA_SHIFT_PIO)
3025 dev->flags |= ATA_DFLAG_PIO;
3027 err_mask = ata_dev_set_xfermode(dev);
3029 /* Old CFA may refuse this command, which is just fine */
3030 if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
3031 err_mask &= ~AC_ERR_DEV;
3033 /* Some very old devices and some bad newer ones fail any kind of
3034 SET_XFERMODE request but support PIO0-2 timings and no IORDY */
3035 if (dev->xfer_shift == ATA_SHIFT_PIO && !ata_id_has_iordy(dev->id) &&
3036 dev->pio_mode <= XFER_PIO_2)
3037 err_mask &= ~AC_ERR_DEV;
3039 /* Early MWDMA devices do DMA but don't allow DMA mode setting.
3040 Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3041 if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3042 dev->dma_mode == XFER_MW_DMA_0 &&
3043 (dev->id[63] >> 8) & 1)
3044 err_mask &= ~AC_ERR_DEV;
3047 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
3048 "(err_mask=0x%x)\n", err_mask);
3052 ehc->i.flags |= ATA_EHI_POST_SETMODE;
3053 rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3054 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3058 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
3059 dev->xfer_shift, (int)dev->xfer_mode);
3061 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
3062 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
3067 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3068 * @link: link on which timings will be programmed
3069 * @r_failed_dev: out paramter for failed device
3071 * Standard implementation of the function used to tune and set
3072 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3073 * ata_dev_set_mode() fails, pointer to the failing device is
3074 * returned in @r_failed_dev.
3077 * PCI/etc. bus probe sem.
3080 * 0 on success, negative errno otherwise
3083 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3085 struct ata_port *ap = link->ap;
3086 struct ata_device *dev;
3087 int rc = 0, used_dma = 0, found = 0;
3089 /* step 1: calculate xfer_mask */
3090 ata_link_for_each_dev(dev, link) {
3091 unsigned int pio_mask, dma_mask;
3092 unsigned int mode_mask;
3094 if (!ata_dev_enabled(dev))
3097 mode_mask = ATA_DMA_MASK_ATA;
3098 if (dev->class == ATA_DEV_ATAPI)
3099 mode_mask = ATA_DMA_MASK_ATAPI;
3100 else if (ata_id_is_cfa(dev->id))
3101 mode_mask = ATA_DMA_MASK_CFA;
3103 ata_dev_xfermask(dev);
3105 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3106 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3108 if (libata_dma_mask & mode_mask)
3109 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3113 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
3114 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3123 /* step 2: always set host PIO timings */
3124 ata_link_for_each_dev(dev, link) {
3125 if (!ata_dev_enabled(dev))
3128 if (!dev->pio_mode) {
3129 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3134 dev->xfer_mode = dev->pio_mode;
3135 dev->xfer_shift = ATA_SHIFT_PIO;
3136 if (ap->ops->set_piomode)
3137 ap->ops->set_piomode(ap, dev);
3140 /* step 3: set host DMA timings */
3141 ata_link_for_each_dev(dev, link) {
3142 if (!ata_dev_enabled(dev) || !dev->dma_mode)
3145 dev->xfer_mode = dev->dma_mode;
3146 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
3147 if (ap->ops->set_dmamode)
3148 ap->ops->set_dmamode(ap, dev);
3151 /* step 4: update devices' xfer mode */
3152 ata_link_for_each_dev(dev, link) {
3153 /* don't update suspended devices' xfer mode */
3154 if (!ata_dev_enabled(dev))
3157 rc = ata_dev_set_mode(dev);
3162 /* Record simplex status. If we selected DMA then the other
3163 * host channels are not permitted to do so.
3165 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
3166 ap->host->simplex_claimed = ap;
3170 *r_failed_dev = dev;
3175 * ata_set_mode - Program timings and issue SET FEATURES - XFER
3176 * @link: link on which timings will be programmed
3177 * @r_failed_dev: out paramter for failed device
3179 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3180 * ata_set_mode() fails, pointer to the failing device is
3181 * returned in @r_failed_dev.
3184 * PCI/etc. bus probe sem.
3187 * 0 on success, negative errno otherwise
3189 int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3191 struct ata_port *ap = link->ap;
3193 /* has private set_mode? */
3194 if (ap->ops->set_mode)
3195 return ap->ops->set_mode(link, r_failed_dev);
3196 return ata_do_set_mode(link, r_failed_dev);
3200 * ata_tf_to_host - issue ATA taskfile to host controller
3201 * @ap: port to which command is being issued
3202 * @tf: ATA taskfile register set
3204 * Issues ATA taskfile register set to ATA host controller,
3205 * with proper synchronization with interrupt handler and
3209 * spin_lock_irqsave(host lock)
3212 static inline void ata_tf_to_host(struct ata_port *ap,
3213 const struct ata_taskfile *tf)
3215 ap->ops->tf_load(ap, tf);
3216 ap->ops->exec_command(ap, tf);
3220 * ata_busy_sleep - sleep until BSY clears, or timeout
3221 * @ap: port containing status register to be polled
3222 * @tmout_pat: impatience timeout
3223 * @tmout: overall timeout
3225 * Sleep until ATA Status register bit BSY clears,
3226 * or a timeout occurs.
3229 * Kernel thread context (may sleep).
3232 * 0 on success, -errno otherwise.
3234 int ata_busy_sleep(struct ata_port *ap,
3235 unsigned long tmout_pat, unsigned long tmout)
3237 unsigned long timer_start, timeout;
3240 status = ata_busy_wait(ap, ATA_BUSY, 300);
3241 timer_start = jiffies;
3242 timeout = timer_start + tmout_pat;
3243 while (status != 0xff && (status & ATA_BUSY) &&
3244 time_before(jiffies, timeout)) {
3246 status = ata_busy_wait(ap, ATA_BUSY, 3);
3249 if (status != 0xff && (status & ATA_BUSY))
3250 ata_port_printk(ap, KERN_WARNING,
3251 "port is slow to respond, please be patient "
3252 "(Status 0x%x)\n", status);
3254 timeout = timer_start + tmout;
3255 while (status != 0xff && (status & ATA_BUSY) &&
3256 time_before(jiffies, timeout)) {
3258 status = ata_chk_status(ap);
3264 if (status & ATA_BUSY) {
3265 ata_port_printk(ap, KERN_ERR, "port failed to respond "
3266 "(%lu secs, Status 0x%x)\n",
3267 tmout / HZ, status);
3275 * ata_wait_after_reset - wait before checking status after reset
3276 * @ap: port containing status register to be polled
3277 * @deadline: deadline jiffies for the operation
3279 * After reset, we need to pause a while before reading status.
3280 * Also, certain combination of controller and device report 0xff
3281 * for some duration (e.g. until SATA PHY is up and running)
3282 * which is interpreted as empty port in ATA world. This
3283 * function also waits for such devices to get out of 0xff
3287 * Kernel thread context (may sleep).
3289 void ata_wait_after_reset(struct ata_port *ap, unsigned long deadline)
3291 unsigned long until = jiffies + ATA_TMOUT_FF_WAIT;
3293 if (time_before(until, deadline))
3296 /* Spec mandates ">= 2ms" before checking status. We wait
3297 * 150ms, because that was the magic delay used for ATAPI
3298 * devices in Hale Landis's ATADRVR, for the period of time
3299 * between when the ATA command register is written, and then
3300 * status is checked. Because waiting for "a while" before
3301 * checking status is fine, post SRST, we perform this magic
3302 * delay here as well.
3304 * Old drivers/ide uses the 2mS rule and then waits for ready.
3308 /* Wait for 0xff to clear. Some SATA devices take a long time
3309 * to clear 0xff after reset. For example, HHD424020F7SV00
3310 * iVDR needs >= 800ms while. Quantum GoVault needs even more
3313 * Note that some PATA controllers (pata_ali) explode if
3314 * status register is read more than once when there's no
3317 if (ap->flags & ATA_FLAG_SATA) {
3319 u8 status = ata_chk_status(ap);
3321 if (status != 0xff || time_after(jiffies, deadline))
3330 * ata_wait_ready - sleep until BSY clears, or timeout
3331 * @ap: port containing status register to be polled
3332 * @deadline: deadline jiffies for the operation
3334 * Sleep until ATA Status register bit BSY clears, or timeout
3338 * Kernel thread context (may sleep).
3341 * 0 on success, -errno otherwise.
3343 int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
3345 unsigned long start = jiffies;
3349 u8 status = ata_chk_status(ap);
3350 unsigned long now = jiffies;
3352 if (!(status & ATA_BUSY))
3354 if (!ata_link_online(&ap->link) && status == 0xff)
3356 if (time_after(now, deadline))
3359 if (!warned && time_after(now, start + 5 * HZ) &&
3360 (deadline - now > 3 * HZ)) {
3361 ata_port_printk(ap, KERN_WARNING,
3362 "port is slow to respond, please be patient "
3363 "(Status 0x%x)\n", status);
3371 static int ata_bus_post_reset(struct ata_port *ap, unsigned int devmask,
3372 unsigned long deadline)
3374 struct ata_ioports *ioaddr = &ap->ioaddr;
3375 unsigned int dev0 = devmask & (1 << 0);
3376 unsigned int dev1 = devmask & (1 << 1);
3379 /* if device 0 was found in ata_devchk, wait for its
3383 rc = ata_wait_ready(ap, deadline);
3391 /* if device 1 was found in ata_devchk, wait for register
3392 * access briefly, then wait for BSY to clear.
3397 ap->ops->dev_select(ap, 1);
3399 /* Wait for register access. Some ATAPI devices fail
3400 * to set nsect/lbal after reset, so don't waste too
3401 * much time on it. We're gonna wait for !BSY anyway.
3403 for (i = 0; i < 2; i++) {
3406 nsect = ioread8(ioaddr->nsect_addr);
3407 lbal = ioread8(ioaddr->lbal_addr);
3408 if ((nsect == 1) && (lbal == 1))
3410 msleep(50); /* give drive a breather */
3413 rc = ata_wait_ready(ap, deadline);
3421 /* is all this really necessary? */
3422 ap->ops->dev_select(ap, 0);
3424 ap->ops->dev_select(ap, 1);
3426 ap->ops->dev_select(ap, 0);
3431 static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
3432 unsigned long deadline)
3434 struct ata_ioports *ioaddr = &ap->ioaddr;
3436 DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
3438 /* software reset. causes dev0 to be selected */
3439 iowrite8(ap->ctl, ioaddr->ctl_addr);
3440 udelay(20); /* FIXME: flush */
3441 iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
3442 udelay(20); /* FIXME: flush */
3443 iowrite8(ap->ctl, ioaddr->ctl_addr);
3445 /* wait a while before checking status */
3446 ata_wait_after_reset(ap, deadline);
3448 /* Before we perform post reset processing we want to see if
3449 * the bus shows 0xFF because the odd clown forgets the D7
3450 * pulldown resistor.
3452 if (ata_chk_status(ap) == 0xFF)
3455 return ata_bus_post_reset(ap, devmask, deadline);
3459 * ata_bus_reset - reset host port and associated ATA channel
3460 * @ap: port to reset
3462 * This is typically the first time we actually start issuing
3463 * commands to the ATA channel. We wait for BSY to clear, then
3464 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
3465 * result. Determine what devices, if any, are on the channel
3466 * by looking at the device 0/1 error register. Look at the signature
3467 * stored in each device's taskfile registers, to determine if
3468 * the device is ATA or ATAPI.
3471 * PCI/etc. bus probe sem.
3472 * Obtains host lock.
3475 * Sets ATA_FLAG_DISABLED if bus reset fails.
3478 void ata_bus_reset(struct ata_port *ap)
3480 struct ata_device *device = ap->link.device;
3481 struct ata_ioports *ioaddr = &ap->ioaddr;
3482 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3484 unsigned int dev0, dev1 = 0, devmask = 0;
3487 DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
3489 /* determine if device 0/1 are present */
3490 if (ap->flags & ATA_FLAG_SATA_RESET)
3493 dev0 = ata_devchk(ap, 0);
3495 dev1 = ata_devchk(ap, 1);
3499 devmask |= (1 << 0);
3501 devmask |= (1 << 1);
3503 /* select device 0 again */
3504 ap->ops->dev_select(ap, 0);
3506 /* issue bus reset */
3507 if (ap->flags & ATA_FLAG_SRST) {
3508 rc = ata_bus_softreset(ap, devmask, jiffies + 40 * HZ);
3509 if (rc && rc != -ENODEV)
3514 * determine by signature whether we have ATA or ATAPI devices
3516 device[0].class = ata_dev_try_classify(&device[0], dev0, &err);
3517 if ((slave_possible) && (err != 0x81))
3518 device[1].class = ata_dev_try_classify(&device[1], dev1, &err);
3520 /* is double-select really necessary? */
3521 if (device[1].class != ATA_DEV_NONE)
3522 ap->ops->dev_select(ap, 1);
3523 if (device[0].class != ATA_DEV_NONE)
3524 ap->ops->dev_select(ap, 0);
3526 /* if no devices were detected, disable this port */
3527 if ((device[0].class == ATA_DEV_NONE) &&
3528 (device[1].class == ATA_DEV_NONE))
3531 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
3532 /* set up device control for ATA_FLAG_SATA_RESET */
3533 iowrite8(ap->ctl, ioaddr->ctl_addr);
3540 ata_port_printk(ap, KERN_ERR, "disabling port\n");
3541 ata_port_disable(ap);
3547 * sata_link_debounce - debounce SATA phy status
3548 * @link: ATA link to debounce SATA phy status for
3549 * @params: timing parameters { interval, duratinon, timeout } in msec
3550 * @deadline: deadline jiffies for the operation
3552 * Make sure SStatus of @link reaches stable state, determined by
3553 * holding the same value where DET is not 1 for @duration polled
3554 * every @interval, before @timeout. Timeout constraints the
3555 * beginning of the stable state. Because DET gets stuck at 1 on
3556 * some controllers after hot unplugging, this functions waits
3557 * until timeout then returns 0 if DET is stable at 1.
3559 * @timeout is further limited by @deadline. The sooner of the
3563 * Kernel thread context (may sleep)
3566 * 0 on success, -errno on failure.
3568 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3569 unsigned long deadline)
3571 unsigned long interval_msec = params[0];
3572 unsigned long duration = msecs_to_jiffies(params[1]);
3573 unsigned long last_jiffies, t;
3577 t = jiffies + msecs_to_jiffies(params[2]);
3578 if (time_before(t, deadline))
3581 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3586 last_jiffies = jiffies;
3589 msleep(interval_msec);
3590 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3596 if (cur == 1 && time_before(jiffies, deadline))
3598 if (time_after(jiffies, last_jiffies + duration))
3603 /* unstable, start over */
3605 last_jiffies = jiffies;
3607 /* Check deadline. If debouncing failed, return
3608 * -EPIPE to tell upper layer to lower link speed.
3610 if (time_after(jiffies, deadline))
3616 * sata_link_resume - resume SATA link
3617 * @link: ATA link to resume SATA
3618 * @params: timing parameters { interval, duratinon, timeout } in msec
3619 * @deadline: deadline jiffies for the operation
3621 * Resume SATA phy @link and debounce it.
3624 * Kernel thread context (may sleep)
3627 * 0 on success, -errno on failure.
3629 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3630 unsigned long deadline)
3635 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3638 scontrol = (scontrol & 0x0f0) | 0x300;
3640 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3643 /* Some PHYs react badly if SStatus is pounded immediately
3644 * after resuming. Delay 200ms before debouncing.
3648 return sata_link_debounce(link, params, deadline);
3652 * ata_std_prereset - prepare for reset
3653 * @link: ATA link to be reset
3654 * @deadline: deadline jiffies for the operation
3656 * @link is about to be reset. Initialize it. Failure from
3657 * prereset makes libata abort whole reset sequence and give up
3658 * that port, so prereset should be best-effort. It does its
3659 * best to prepare for reset sequence but if things go wrong, it
3660 * should just whine, not fail.
3663 * Kernel thread context (may sleep)
3666 * 0 on success, -errno otherwise.
3668 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3670 struct ata_port *ap = link->ap;
3671 struct ata_eh_context *ehc = &link->eh_context;
3672 const unsigned long *timing = sata_ehc_deb_timing(ehc);
3675 /* handle link resume */
3676 if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
3677 (link->flags & ATA_LFLAG_HRST_TO_RESUME))
3678 ehc->i.action |= ATA_EH_HARDRESET;
3680 /* Some PMPs don't work with only SRST, force hardreset if PMP
3683 if (ap->flags & ATA_FLAG_PMP)
3684 ehc->i.action |= ATA_EH_HARDRESET;
3686 /* if we're about to do hardreset, nothing more to do */
3687 if (ehc->i.action & ATA_EH_HARDRESET)
3690 /* if SATA, resume link */
3691 if (ap->flags & ATA_FLAG_SATA) {
3692 rc = sata_link_resume(link, timing, deadline);
3693 /* whine about phy resume failure but proceed */
3694 if (rc && rc != -EOPNOTSUPP)
3695 ata_link_printk(link, KERN_WARNING, "failed to resume "
3696 "link for reset (errno=%d)\n", rc);
3699 /* Wait for !BSY if the controller can wait for the first D2H
3700 * Reg FIS and we don't know that no device is attached.
3702 if (!(link->flags & ATA_LFLAG_SKIP_D2H_BSY) && !ata_link_offline(link)) {
3703 rc = ata_wait_ready(ap, deadline);
3704 if (rc && rc != -ENODEV) {
3705 ata_link_printk(link, KERN_WARNING, "device not ready "
3706 "(errno=%d), forcing hardreset\n", rc);
3707 ehc->i.action |= ATA_EH_HARDRESET;
3715 * ata_std_softreset - reset host port via ATA SRST
3716 * @link: ATA link to reset
3717 * @classes: resulting classes of attached devices
3718 * @deadline: deadline jiffies for the operation
3720 * Reset host port using ATA SRST.
3723 * Kernel thread context (may sleep)
3726 * 0 on success, -errno otherwise.
3728 int ata_std_softreset(struct ata_link *link, unsigned int *classes,
3729 unsigned long deadline)
3731 struct ata_port *ap = link->ap;
3732 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3733 unsigned int devmask = 0;
3739 if (ata_link_offline(link)) {
3740 classes[0] = ATA_DEV_NONE;
3744 /* determine if device 0/1 are present */
3745 if (ata_devchk(ap, 0))
3746 devmask |= (1 << 0);
3747 if (slave_possible && ata_devchk(ap, 1))
3748 devmask |= (1 << 1);
3750 /* select device 0 again */
3751 ap->ops->dev_select(ap, 0);
3753 /* issue bus reset */
3754 DPRINTK("about to softreset, devmask=%x\n", devmask);
3755 rc = ata_bus_softreset(ap, devmask, deadline);
3756 /* if link is occupied, -ENODEV too is an error */
3757 if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
3758 ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
3762 /* determine by signature whether we have ATA or ATAPI devices */
3763 classes[0] = ata_dev_try_classify(&link->device[0],
3764 devmask & (1 << 0), &err);
3765 if (slave_possible && err != 0x81)
3766 classes[1] = ata_dev_try_classify(&link->device[1],
3767 devmask & (1 << 1), &err);
3770 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
3775 * sata_link_hardreset - reset link via SATA phy reset
3776 * @link: link to reset
3777 * @timing: timing parameters { interval, duratinon, timeout } in msec
3778 * @deadline: deadline jiffies for the operation
3780 * SATA phy-reset @link using DET bits of SControl register.
3783 * Kernel thread context (may sleep)
3786 * 0 on success, -errno otherwise.
3788 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3789 unsigned long deadline)
3796 if (sata_set_spd_needed(link)) {
3797 /* SATA spec says nothing about how to reconfigure
3798 * spd. To be on the safe side, turn off phy during
3799 * reconfiguration. This works for at least ICH7 AHCI
3802 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3805 scontrol = (scontrol & 0x0f0) | 0x304;
3807 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3813 /* issue phy wake/reset */
3814 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3817 scontrol = (scontrol & 0x0f0) | 0x301;
3819 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3822 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3823 * 10.4.2 says at least 1 ms.
3827 /* bring link back */
3828 rc = sata_link_resume(link, timing, deadline);
3830 DPRINTK("EXIT, rc=%d\n", rc);
3835 * sata_std_hardreset - reset host port via SATA phy reset
3836 * @link: link to reset
3837 * @class: resulting class of attached device
3838 * @deadline: deadline jiffies for the operation
3840 * SATA phy-reset host port using DET bits of SControl register,
3841 * wait for !BSY and classify the attached device.
3844 * Kernel thread context (may sleep)
3847 * 0 on success, -errno otherwise.
3849 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3850 unsigned long deadline)
3852 struct ata_port *ap = link->ap;
3853 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3859 rc = sata_link_hardreset(link, timing, deadline);
3861 ata_link_printk(link, KERN_ERR,
3862 "COMRESET failed (errno=%d)\n", rc);
3866 /* TODO: phy layer with polling, timeouts, etc. */
3867 if (ata_link_offline(link)) {
3868 *class = ATA_DEV_NONE;
3869 DPRINTK("EXIT, link offline\n");
3873 /* wait a while before checking status */
3874 ata_wait_after_reset(ap, deadline);
3876 /* If PMP is supported, we have to do follow-up SRST. Note
3877 * that some PMPs don't send D2H Reg FIS after hardreset at
3878 * all if the first port is empty. Wait for it just for a
3879 * second and request follow-up SRST.
3881 if (ap->flags & ATA_FLAG_PMP) {
3882 ata_wait_ready(ap, jiffies + HZ);
3886 rc = ata_wait_ready(ap, deadline);
3887 /* link occupied, -ENODEV too is an error */
3889 ata_link_printk(link, KERN_ERR,
3890 "COMRESET failed (errno=%d)\n", rc);
3894 ap->ops->dev_select(ap, 0); /* probably unnecessary */
3896 *class = ata_dev_try_classify(link->device, 1, NULL);
3898 DPRINTK("EXIT, class=%u\n", *class);
3903 * ata_std_postreset - standard postreset callback
3904 * @link: the target ata_link
3905 * @classes: classes of attached devices
3907 * This function is invoked after a successful reset. Note that
3908 * the device might have been reset more than once using
3909 * different reset methods before postreset is invoked.
3912 * Kernel thread context (may sleep)
3914 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3916 struct ata_port *ap = link->ap;
3921 /* print link status */
3922 sata_print_link_status(link);
3925 if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
3926 sata_scr_write(link, SCR_ERROR, serror);
3927 link->eh_info.serror = 0;
3929 /* is double-select really necessary? */
3930 if (classes[0] != ATA_DEV_NONE)
3931 ap->ops->dev_select(ap, 1);
3932 if (classes[1] != ATA_DEV_NONE)
3933 ap->ops->dev_select(ap, 0);
3935 /* bail out if no device is present */
3936 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
3937 DPRINTK("EXIT, no device\n");
3941 /* set up device control */
3942 if (ap->ioaddr.ctl_addr)
3943 iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3949 * ata_dev_same_device - Determine whether new ID matches configured device
3950 * @dev: device to compare against
3951 * @new_class: class of the new device
3952 * @new_id: IDENTIFY page of the new device
3954 * Compare @new_class and @new_id against @dev and determine
3955 * whether @dev is the device indicated by @new_class and
3962 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
3964 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
3967 const u16 *old_id = dev->id;
3968 unsigned char model[2][ATA_ID_PROD_LEN + 1];
3969 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3971 if (dev->class != new_class) {
3972 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
3973 dev->class, new_class);
3977 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
3978 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
3979 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
3980 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3982 if (strcmp(model[0], model[1])) {
3983 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
3984 "'%s' != '%s'\n", model[0], model[1]);
3988 if (strcmp(serial[0], serial[1])) {
3989 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
3990 "'%s' != '%s'\n", serial[0], serial[1]);
3998 * ata_dev_reread_id - Re-read IDENTIFY data
3999 * @dev: target ATA device
4000 * @readid_flags: read ID flags
4002 * Re-read IDENTIFY page and make sure @dev is still attached to
4006 * Kernel thread context (may sleep)
4009 * 0 on success, negative errno otherwise
4011 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
4013 unsigned int class = dev->class;
4014 u16 *id = (void *)dev->link->ap->sector_buf;
4018 rc = ata_dev_read_id(dev, &class, readid_flags, id);
4022 /* is the device still there? */
4023 if (!ata_dev_same_device(dev, class, id))
4026 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4031 * ata_dev_revalidate - Revalidate ATA device
4032 * @dev: device to revalidate
4033 * @new_class: new class code
4034 * @readid_flags: read ID flags
4036 * Re-read IDENTIFY page, make sure @dev is still attached to the
4037 * port and reconfigure it according to the new IDENTIFY page.
4040 * Kernel thread context (may sleep)
4043 * 0 on success, negative errno otherwise
4045 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
4046 unsigned int readid_flags)
4048 u64 n_sectors = dev->n_sectors;
4051 if (!ata_dev_enabled(dev))
4054 /* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
4055 if (ata_class_enabled(new_class) &&
4056 new_class != ATA_DEV_ATA && new_class != ATA_DEV_ATAPI) {
4057 ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
4058 dev->class, new_class);
4064 rc = ata_dev_reread_id(dev, readid_flags);
4068 /* configure device according to the new ID */
4069 rc = ata_dev_configure(dev);
4073 /* verify n_sectors hasn't changed */
4074 if (dev->class == ATA_DEV_ATA && n_sectors &&
4075 dev->n_sectors != n_sectors) {
4076 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
4078 (unsigned long long)n_sectors,
4079 (unsigned long long)dev->n_sectors);
4081 /* restore original n_sectors */
4082 dev->n_sectors = n_sectors;
4091 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
4095 struct ata_blacklist_entry {
4096 const char *model_num;
4097 const char *model_rev;
4098 unsigned long horkage;
4101 static const struct ata_blacklist_entry ata_device_blacklist [] = {
4102 /* Devices with DMA related problems under Linux */
4103 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
4104 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
4105 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
4106 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
4107 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
4108 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
4109 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
4110 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
4111 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
4112 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
4113 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
4114 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
4115 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
4116 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
4117 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
4118 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
4119 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
4120 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
4121 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
4122 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
4123 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
4124 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
4125 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
4126 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
4127 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
4128 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
4129 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
4130 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
4131 { "SAMSUNG CD-ROM SN-124", "N001", ATA_HORKAGE_NODMA },
4132 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA },
4133 /* Odd clown on sil3726/4726 PMPs */
4134 { "Config Disk", NULL, ATA_HORKAGE_NODMA |
4135 ATA_HORKAGE_SKIP_PM },
4137 /* Weird ATAPI devices */
4138 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
4140 /* Devices we expect to fail diagnostics */
4142 /* Devices where NCQ should be avoided */
4144 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
4145 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, },
4146 /* http://thread.gmane.org/gmane.linux.ide/14907 */
4147 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ },
4149 { "Maxtor *", "BANC*", ATA_HORKAGE_NONCQ },
4150 { "Maxtor 7V300F0", "VA111630", ATA_HORKAGE_NONCQ },
4151 { "HITACHI HDS7250SASUN500G*", NULL, ATA_HORKAGE_NONCQ },
4152 { "HITACHI HDS7225SBSUN250G*", NULL, ATA_HORKAGE_NONCQ },
4153 { "ST380817AS", "3.42", ATA_HORKAGE_NONCQ },
4154 { "ST3160023AS", "3.42", ATA_HORKAGE_NONCQ },
4156 /* Blacklist entries taken from Silicon Image 3124/3132
4157 Windows driver .inf file - also several Linux problem reports */
4158 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, },
4159 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, },
4160 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, },
4162 /* devices which puke on READ_NATIVE_MAX */
4163 { "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, },
4164 { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
4165 { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
4166 { "MAXTOR 6L080L4", "A93.0500", ATA_HORKAGE_BROKEN_HPA },
4168 /* Devices which report 1 sector over size HPA */
4169 { "ST340823A", NULL, ATA_HORKAGE_HPA_SIZE, },
4170 { "ST320413A", NULL, ATA_HORKAGE_HPA_SIZE, },
4172 /* Devices which get the IVB wrong */
4173 { "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4174 { "TSSTcorp CDDVDW SH-S202J", "SB00", ATA_HORKAGE_IVB, },
4175 { "TSSTcorp CDDVDW SH-S202J", "SB01", ATA_HORKAGE_IVB, },
4176 { "TSSTcorp CDDVDW SH-S202N", "SB00", ATA_HORKAGE_IVB, },
4177 { "TSSTcorp CDDVDW SH-S202N", "SB01", ATA_HORKAGE_IVB, },
4183 static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
4189 * check for trailing wildcard: *\0
4191 p = strchr(patt, wildchar);
4192 if (p && ((*(p + 1)) == 0))
4203 return strncmp(patt, name, len);
4206 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
4208 unsigned char model_num[ATA_ID_PROD_LEN + 1];
4209 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4210 const struct ata_blacklist_entry *ad = ata_device_blacklist;
4212 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
4213 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
4215 while (ad->model_num) {
4216 if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4217 if (ad->model_rev == NULL)
4219 if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4227 static int ata_dma_blacklisted(const struct ata_device *dev)
4229 /* We don't support polling DMA.
4230 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
4231 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
4233 if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4234 (dev->flags & ATA_DFLAG_CDB_INTR))
4236 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4240 * ata_is_40wire - check drive side detection
4243 * Perform drive side detection decoding, allowing for device vendors
4244 * who can't follow the documentation.
4247 static int ata_is_40wire(struct ata_device *dev)
4249 if (dev->horkage & ATA_HORKAGE_IVB)
4250 return ata_drive_40wire_relaxed(dev->id);
4251 return ata_drive_40wire(dev->id);
4255 * ata_dev_xfermask - Compute supported xfermask of the given device
4256 * @dev: Device to compute xfermask for
4258 * Compute supported xfermask of @dev and store it in
4259 * dev->*_mask. This function is responsible for applying all
4260 * known limits including host controller limits, device
4266 static void ata_dev_xfermask(struct ata_device *dev)
4268 struct ata_link *link = dev->link;
4269 struct ata_port *ap = link->ap;
4270 struct ata_host *host = ap->host;
4271 unsigned long xfer_mask;
4273 /* controller modes available */
4274 xfer_mask = ata_pack_xfermask(ap->pio_mask,
4275 ap->mwdma_mask, ap->udma_mask);
4277 /* drive modes available */
4278 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
4279 dev->mwdma_mask, dev->udma_mask);
4280 xfer_mask &= ata_id_xfermask(dev->id);
4283 * CFA Advanced TrueIDE timings are not allowed on a shared
4286 if (ata_dev_pair(dev)) {
4287 /* No PIO5 or PIO6 */
4288 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
4289 /* No MWDMA3 or MWDMA 4 */
4290 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
4293 if (ata_dma_blacklisted(dev)) {
4294 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4295 ata_dev_printk(dev, KERN_WARNING,
4296 "device is on DMA blacklist, disabling DMA\n");
4299 if ((host->flags & ATA_HOST_SIMPLEX) &&
4300 host->simplex_claimed && host->simplex_claimed != ap) {
4301 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4302 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
4303 "other device, disabling DMA\n");
4306 if (ap->flags & ATA_FLAG_NO_IORDY)
4307 xfer_mask &= ata_pio_mask_no_iordy(dev);
4309 if (ap->ops->mode_filter)
4310 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4312 /* Apply cable rule here. Don't apply it early because when
4313 * we handle hot plug the cable type can itself change.
4314 * Check this last so that we know if the transfer rate was
4315 * solely limited by the cable.
4316 * Unknown or 80 wire cables reported host side are checked
4317 * drive side as well. Cases where we know a 40wire cable
4318 * is used safely for 80 are not checked here.
4320 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
4321 /* UDMA/44 or higher would be available */
4322 if ((ap->cbl == ATA_CBL_PATA40) ||
4323 (ata_is_40wire(dev) &&
4324 (ap->cbl == ATA_CBL_PATA_UNK ||
4325 ap->cbl == ATA_CBL_PATA80))) {
4326 ata_dev_printk(dev, KERN_WARNING,
4327 "limited to UDMA/33 due to 40-wire cable\n");
4328 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
4331 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
4332 &dev->mwdma_mask, &dev->udma_mask);
4336 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
4337 * @dev: Device to which command will be sent
4339 * Issue SET FEATURES - XFER MODE command to device @dev
4343 * PCI/etc. bus probe sem.
4346 * 0 on success, AC_ERR_* mask otherwise.
4349 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
4351 struct ata_taskfile tf;
4352 unsigned int err_mask;
4354 /* set up set-features taskfile */
4355 DPRINTK("set features - xfer mode\n");
4357 /* Some controllers and ATAPI devices show flaky interrupt
4358 * behavior after setting xfer mode. Use polling instead.
4360 ata_tf_init(dev, &tf);
4361 tf.command = ATA_CMD_SET_FEATURES;
4362 tf.feature = SETFEATURES_XFER;
4363 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4364 tf.protocol = ATA_PROT_NODATA;
4365 tf.nsect = dev->xfer_mode;
4367 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4369 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4373 * ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4374 * @dev: Device to which command will be sent
4375 * @enable: Whether to enable or disable the feature
4376 * @feature: The sector count represents the feature to set
4378 * Issue SET FEATURES - SATA FEATURES command to device @dev
4379 * on port @ap with sector count
4382 * PCI/etc. bus probe sem.
4385 * 0 on success, AC_ERR_* mask otherwise.
4387 static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
4390 struct ata_taskfile tf;
4391 unsigned int err_mask;
4393 /* set up set-features taskfile */
4394 DPRINTK("set features - SATA features\n");
4396 ata_tf_init(dev, &tf);
4397 tf.command = ATA_CMD_SET_FEATURES;
4398 tf.feature = enable;
4399 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4400 tf.protocol = ATA_PROT_NODATA;
4403 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4405 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4410 * ata_dev_init_params - Issue INIT DEV PARAMS command
4411 * @dev: Device to which command will be sent
4412 * @heads: Number of heads (taskfile parameter)
4413 * @sectors: Number of sectors (taskfile parameter)
4416 * Kernel thread context (may sleep)
4419 * 0 on success, AC_ERR_* mask otherwise.
4421 static unsigned int ata_dev_init_params(struct ata_device *dev,
4422 u16 heads, u16 sectors)
4424 struct ata_taskfile tf;
4425 unsigned int err_mask;
4427 /* Number of sectors per track 1-255. Number of heads 1-16 */
4428 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4429 return AC_ERR_INVALID;
4431 /* set up init dev params taskfile */
4432 DPRINTK("init dev params \n");
4434 ata_tf_init(dev, &tf);
4435 tf.command = ATA_CMD_INIT_DEV_PARAMS;
4436 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4437 tf.protocol = ATA_PROT_NODATA;
4439 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4441 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4442 /* A clean abort indicates an original or just out of spec drive
4443 and we should continue as we issue the setup based on the
4444 drive reported working geometry */
4445 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4448 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4453 * ata_sg_clean - Unmap DMA memory associated with command
4454 * @qc: Command containing DMA memory to be released
4456 * Unmap all mapped DMA memory associated with this command.
4459 * spin_lock_irqsave(host lock)
4461 void ata_sg_clean(struct ata_queued_cmd *qc)
4463 struct ata_port *ap = qc->ap;
4464 struct scatterlist *sg = qc->__sg;
4465 int dir = qc->dma_dir;
4466 void *pad_buf = NULL;
4468 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
4469 WARN_ON(sg == NULL);
4471 if (qc->flags & ATA_QCFLAG_SINGLE)
4472 WARN_ON(qc->n_elem > 1);
4474 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
4476 /* if we padded the buffer out to 32-bit bound, and data
4477 * xfer direction is from-device, we must copy from the
4478 * pad buffer back into the supplied buffer
4480 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
4481 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4483 if (qc->flags & ATA_QCFLAG_SG) {
4485 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4486 /* restore last sg */
4487 sg_last(sg, qc->orig_n_elem)->length += qc->pad_len;
4489 struct scatterlist *psg = &qc->pad_sgent;
4490 void *addr = kmap_atomic(sg_page(psg), KM_IRQ0);
4491 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
4492 kunmap_atomic(addr, KM_IRQ0);
4496 dma_unmap_single(ap->dev,
4497 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
4500 sg->length += qc->pad_len;
4502 memcpy(qc->buf_virt + sg->length - qc->pad_len,
4503 pad_buf, qc->pad_len);
4506 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4511 * ata_fill_sg - Fill PCI IDE PRD table
4512 * @qc: Metadata associated with taskfile to be transferred
4514 * Fill PCI IDE PRD (scatter-gather) table with segments
4515 * associated with the current disk command.
4518 * spin_lock_irqsave(host lock)
4521 static void ata_fill_sg(struct ata_queued_cmd *qc)
4523 struct ata_port *ap = qc->ap;
4524 struct scatterlist *sg;
4527 WARN_ON(qc->__sg == NULL);
4528 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
4531 ata_for_each_sg(sg, qc) {
4535 /* determine if physical DMA addr spans 64K boundary.
4536 * Note h/w doesn't support 64-bit, so we unconditionally
4537 * truncate dma_addr_t to u32.
4539 addr = (u32) sg_dma_address(sg);
4540 sg_len = sg_dma_len(sg);
4543 offset = addr & 0xffff;
4545 if ((offset + sg_len) > 0x10000)
4546 len = 0x10000 - offset;
4548 ap->prd[idx].addr = cpu_to_le32(addr);
4549 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
4550 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
4559 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
4563 * ata_fill_sg_dumb - Fill PCI IDE PRD table
4564 * @qc: Metadata associated with taskfile to be transferred
4566 * Fill PCI IDE PRD (scatter-gather) table with segments
4567 * associated with the current disk command. Perform the fill
4568 * so that we avoid writing any length 64K records for
4569 * controllers that don't follow the spec.
4572 * spin_lock_irqsave(host lock)
4575 static void ata_fill_sg_dumb(struct ata_queued_cmd *qc)
4577 struct ata_port *ap = qc->ap;
4578 struct scatterlist *sg;
4581 WARN_ON(qc->__sg == NULL);
4582 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
4585 ata_for_each_sg(sg, qc) {
4587 u32 sg_len, len, blen;
4589 /* determine if physical DMA addr spans 64K boundary.
4590 * Note h/w doesn't support 64-bit, so we unconditionally
4591 * truncate dma_addr_t to u32.
4593 addr = (u32) sg_dma_address(sg);
4594 sg_len = sg_dma_len(sg);
4597 offset = addr & 0xffff;
4599 if ((offset + sg_len) > 0x10000)
4600 len = 0x10000 - offset;
4602 blen = len & 0xffff;
4603 ap->prd[idx].addr = cpu_to_le32(addr);
4605 /* Some PATA chipsets like the CS5530 can't
4606 cope with 0x0000 meaning 64K as the spec says */
4607 ap->prd[idx].flags_len = cpu_to_le32(0x8000);
4609 ap->prd[++idx].addr = cpu_to_le32(addr + 0x8000);
4611 ap->prd[idx].flags_len = cpu_to_le32(blen);
4612 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
4621 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
4625 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
4626 * @qc: Metadata associated with taskfile to check
4628 * Allow low-level driver to filter ATA PACKET commands, returning
4629 * a status indicating whether or not it is OK to use DMA for the
4630 * supplied PACKET command.
4633 * spin_lock_irqsave(host lock)
4635 * RETURNS: 0 when ATAPI DMA can be used
4638 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
4640 struct ata_port *ap = qc->ap;
4642 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a
4643 * few ATAPI devices choke on such DMA requests.
4645 if (unlikely(qc->nbytes & 15))
4648 if (ap->ops->check_atapi_dma)
4649 return ap->ops->check_atapi_dma(qc);
4655 * ata_std_qc_defer - Check whether a qc needs to be deferred
4656 * @qc: ATA command in question
4658 * Non-NCQ commands cannot run with any other command, NCQ or
4659 * not. As upper layer only knows the queue depth, we are
4660 * responsible for maintaining exclusion. This function checks
4661 * whether a new command @qc can be issued.
4664 * spin_lock_irqsave(host lock)
4667 * ATA_DEFER_* if deferring is needed, 0 otherwise.
4669 int ata_std_qc_defer(struct ata_queued_cmd *qc)
4671 struct ata_link *link = qc->dev->link;
4673 if (qc->tf.protocol == ATA_PROT_NCQ) {
4674 if (!ata_tag_valid(link->active_tag))
4677 if (!ata_tag_valid(link->active_tag) && !link->sactive)
4681 return ATA_DEFER_LINK;
4685 * ata_qc_prep - Prepare taskfile for submission
4686 * @qc: Metadata associated with taskfile to be prepared
4688 * Prepare ATA taskfile for submission.
4691 * spin_lock_irqsave(host lock)
4693 void ata_qc_prep(struct ata_queued_cmd *qc)
4695 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
4702 * ata_dumb_qc_prep - Prepare taskfile for submission
4703 * @qc: Metadata associated with taskfile to be prepared
4705 * Prepare ATA taskfile for submission.
4708 * spin_lock_irqsave(host lock)
4710 void ata_dumb_qc_prep(struct ata_queued_cmd *qc)
4712 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
4715 ata_fill_sg_dumb(qc);
4718 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4721 * ata_sg_init_one - Associate command with memory buffer
4722 * @qc: Command to be associated
4723 * @buf: Memory buffer
4724 * @buflen: Length of memory buffer, in bytes.
4726 * Initialize the data-related elements of queued_cmd @qc
4727 * to point to a single memory buffer, @buf of byte length @buflen.
4730 * spin_lock_irqsave(host lock)
4733 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
4735 qc->flags |= ATA_QCFLAG_SINGLE;
4737 qc->__sg = &qc->sgent;
4739 qc->orig_n_elem = 1;
4741 qc->nbytes = buflen;
4742 qc->cursg = qc->__sg;
4744 sg_init_one(&qc->sgent, buf, buflen);
4748 * ata_sg_init - Associate command with scatter-gather table.
4749 * @qc: Command to be associated
4750 * @sg: Scatter-gather table.
4751 * @n_elem: Number of elements in s/g table.
4753 * Initialize the data-related elements of queued_cmd @qc
4754 * to point to a scatter-gather table @sg, containing @n_elem
4758 * spin_lock_irqsave(host lock)
4761 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4762 unsigned int n_elem)
4764 qc->flags |= ATA_QCFLAG_SG;
4766 qc->n_elem = n_elem;
4767 qc->orig_n_elem = n_elem;
4768 qc->cursg = qc->__sg;
4772 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
4773 * @qc: Command with memory buffer to be mapped.
4775 * DMA-map the memory buffer associated with queued_cmd @qc.
4778 * spin_lock_irqsave(host lock)
4781 * Zero on success, negative on error.
4784 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
4786 struct ata_port *ap = qc->ap;
4787 int dir = qc->dma_dir;
4788 struct scatterlist *sg = qc->__sg;
4789 dma_addr_t dma_address;
4792 /* we must lengthen transfers to end on a 32-bit boundary */
4793 qc->pad_len = sg->length & 3;
4795 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4796 struct scatterlist *psg = &qc->pad_sgent;
4798 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4800 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
4802 if (qc->tf.flags & ATA_TFLAG_WRITE)
4803 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
4806 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
4807 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
4809 sg->length -= qc->pad_len;
4810 if (sg->length == 0)
4813 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
4814 sg->length, qc->pad_len);
4822 dma_address = dma_map_single(ap->dev, qc->buf_virt,
4824 if (dma_mapping_error(dma_address)) {
4826 sg->length += qc->pad_len;
4830 sg_dma_address(sg) = dma_address;
4831 sg_dma_len(sg) = sg->length;
4834 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
4835 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4841 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
4842 * @qc: Command with scatter-gather table to be mapped.
4844 * DMA-map the scatter-gather table associated with queued_cmd @qc.
4847 * spin_lock_irqsave(host lock)
4850 * Zero on success, negative on error.
4854 static int ata_sg_setup(struct ata_queued_cmd *qc)
4856 struct ata_port *ap = qc->ap;
4857 struct scatterlist *sg = qc->__sg;
4858 struct scatterlist *lsg = sg_last(qc->__sg, qc->n_elem);
4859 int n_elem, pre_n_elem, dir, trim_sg = 0;
4861 VPRINTK("ENTER, ata%u\n", ap->print_id);
4862 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
4864 /* we must lengthen transfers to end on a 32-bit boundary */
4865 qc->pad_len = lsg->length & 3;
4867 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4868 struct scatterlist *psg = &qc->pad_sgent;
4869 unsigned int offset;
4871 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4873 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
4876 * psg->page/offset are used to copy to-be-written
4877 * data in this function or read data in ata_sg_clean.
4879 offset = lsg->offset + lsg->length - qc->pad_len;
4880 sg_init_table(psg, 1);
4881 sg_set_page(psg, nth_page(sg_page(lsg), offset >> PAGE_SHIFT),
4882 qc->pad_len, offset_in_page(offset));
4884 if (qc->tf.flags & ATA_TFLAG_WRITE) {
4885 void *addr = kmap_atomic(sg_page(psg), KM_IRQ0);
4886 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
4887 kunmap_atomic(addr, KM_IRQ0);
4890 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
4891 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
4893 lsg->length -= qc->pad_len;
4894 if (lsg->length == 0)
4897 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
4898 qc->n_elem - 1, lsg->length, qc->pad_len);
4901 pre_n_elem = qc->n_elem;
4902 if (trim_sg && pre_n_elem)
4911 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4913 /* restore last sg */
4914 lsg->length += qc->pad_len;
4918 DPRINTK("%d sg elements mapped\n", n_elem);
4921 qc->n_elem = n_elem;
4927 * swap_buf_le16 - swap halves of 16-bit words in place
4928 * @buf: Buffer to swap
4929 * @buf_words: Number of 16-bit words in buffer.
4931 * Swap halves of 16-bit words if needed to convert from
4932 * little-endian byte order to native cpu byte order, or
4936 * Inherited from caller.
4938 void swap_buf_le16(u16 *buf, unsigned int buf_words)
4943 for (i = 0; i < buf_words; i++)
4944 buf[i] = le16_to_cpu(buf[i]);
4945 #endif /* __BIG_ENDIAN */
4949 * ata_data_xfer - Transfer data by PIO
4950 * @adev: device to target
4952 * @buflen: buffer length
4953 * @write_data: read/write
4955 * Transfer data from/to the device data register by PIO.
4958 * Inherited from caller.
4960 void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
4961 unsigned int buflen, int write_data)
4963 struct ata_port *ap = adev->link->ap;
4964 unsigned int words = buflen >> 1;
4966 /* Transfer multiple of 2 bytes */
4968 iowrite16_rep(ap->ioaddr.data_addr, buf, words);
4970 ioread16_rep(ap->ioaddr.data_addr, buf, words);
4972 /* Transfer trailing 1 byte, if any. */
4973 if (unlikely(buflen & 0x01)) {
4974 u16 align_buf[1] = { 0 };
4975 unsigned char *trailing_buf = buf + buflen - 1;
4978 memcpy(align_buf, trailing_buf, 1);
4979 iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
4981 align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
4982 memcpy(trailing_buf, align_buf, 1);
4988 * ata_data_xfer_noirq - Transfer data by PIO
4989 * @adev: device to target
4991 * @buflen: buffer length
4992 * @write_data: read/write
4994 * Transfer data from/to the device data register by PIO. Do the
4995 * transfer with interrupts disabled.
4998 * Inherited from caller.
5000 void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
5001 unsigned int buflen, int write_data)
5003 unsigned long flags;
5004 local_irq_save(flags);
5005 ata_data_xfer(adev, buf, buflen, write_data);
5006 local_irq_restore(flags);
5011 * ata_pio_sector - Transfer a sector of data.
5012 * @qc: Command on going
5014 * Transfer qc->sect_size bytes of data from/to the ATA device.
5017 * Inherited from caller.
5020 static void ata_pio_sector(struct ata_queued_cmd *qc)
5022 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
5023 struct ata_port *ap = qc->ap;
5025 unsigned int offset;
5028 if (qc->curbytes == qc->nbytes - qc->sect_size)
5029 ap->hsm_task_state = HSM_ST_LAST;
5031 page = sg_page(qc->cursg);
5032 offset = qc->cursg->offset + qc->cursg_ofs;
5034 /* get the current page and offset */
5035 page = nth_page(page, (offset >> PAGE_SHIFT));
5036 offset %= PAGE_SIZE;
5038 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
5040 if (PageHighMem(page)) {
5041 unsigned long flags;
5043 /* FIXME: use a bounce buffer */
5044 local_irq_save(flags);
5045 buf = kmap_atomic(page, KM_IRQ0);
5047 /* do the actual data transfer */
5048 ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
5050 kunmap_atomic(buf, KM_IRQ0);
5051 local_irq_restore(flags);
5053 buf = page_address(page);
5054 ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
5057 qc->curbytes += qc->sect_size;
5058 qc->cursg_ofs += qc->sect_size;
5060 if (qc->cursg_ofs == qc->cursg->length) {
5061 qc->cursg = sg_next(qc->cursg);
5067 * ata_pio_sectors - Transfer one or many sectors.
5068 * @qc: Command on going
5070 * Transfer one or many sectors of data from/to the
5071 * ATA device for the DRQ request.
5074 * Inherited from caller.
5077 static void ata_pio_sectors(struct ata_queued_cmd *qc)
5079 if (is_multi_taskfile(&qc->tf)) {
5080 /* READ/WRITE MULTIPLE */
5083 WARN_ON(qc->dev->multi_count == 0);
5085 nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
5086 qc->dev->multi_count);
5092 ata_altstatus(qc->ap); /* flush */
5096 * atapi_send_cdb - Write CDB bytes to hardware
5097 * @ap: Port to which ATAPI device is attached.
5098 * @qc: Taskfile currently active
5100 * When device has indicated its readiness to accept
5101 * a CDB, this function is called. Send the CDB.
5107 static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
5110 DPRINTK("send cdb\n");
5111 WARN_ON(qc->dev->cdb_len < 12);
5113 ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
5114 ata_altstatus(ap); /* flush */
5116 switch (qc->tf.protocol) {
5117 case ATA_PROT_ATAPI:
5118 ap->hsm_task_state = HSM_ST;
5120 case ATA_PROT_ATAPI_NODATA:
5121 ap->hsm_task_state = HSM_ST_LAST;
5123 case ATA_PROT_ATAPI_DMA:
5124 ap->hsm_task_state = HSM_ST_LAST;
5125 /* initiate bmdma */
5126 ap->ops->bmdma_start(qc);
5132 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
5133 * @qc: Command on going
5134 * @bytes: number of bytes
5136 * Transfer Transfer data from/to the ATAPI device.
5139 * Inherited from caller.
5143 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
5145 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
5146 struct scatterlist *sg = qc->__sg;
5147 struct scatterlist *lsg = sg_last(qc->__sg, qc->n_elem);
5148 struct ata_port *ap = qc->ap;
5151 unsigned int offset, count;
5154 if (qc->curbytes + bytes >= qc->nbytes)
5155 ap->hsm_task_state = HSM_ST_LAST;
5158 if (unlikely(no_more_sg)) {
5160 * The end of qc->sg is reached and the device expects
5161 * more data to transfer. In order not to overrun qc->sg
5162 * and fulfill length specified in the byte count register,
5163 * - for read case, discard trailing data from the device
5164 * - for write case, padding zero data to the device
5166 u16 pad_buf[1] = { 0 };
5167 unsigned int words = bytes >> 1;
5170 if (words) /* warning if bytes > 1 */
5171 ata_dev_printk(qc->dev, KERN_WARNING,
5172 "%u bytes trailing data\n", bytes);
5174 for (i = 0; i < words; i++)
5175 ap->ops->data_xfer(qc->dev, (unsigned char *)pad_buf, 2, do_write);
5177 ap->hsm_task_state = HSM_ST_LAST;
5184 offset = sg->offset + qc->cursg_ofs;
5186 /* get the current page and offset */
5187 page = nth_page(page, (offset >> PAGE_SHIFT));
5188 offset %= PAGE_SIZE;
5190 /* don't overrun current sg */
5191 count = min(sg->length - qc->cursg_ofs, bytes);
5193 /* don't cross page boundaries */
5194 count = min(count, (unsigned int)PAGE_SIZE - offset);
5196 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
5198 if (PageHighMem(page)) {
5199 unsigned long flags;
5201 /* FIXME: use bounce buffer */
5202 local_irq_save(flags);
5203 buf = kmap_atomic(page, KM_IRQ0);
5205 /* do the actual data transfer */
5206 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
5208 kunmap_atomic(buf, KM_IRQ0);
5209 local_irq_restore(flags);
5211 buf = page_address(page);
5212 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
5216 qc->curbytes += count;
5217 qc->cursg_ofs += count;
5219 if (qc->cursg_ofs == sg->length) {
5220 if (qc->cursg == lsg)
5223 qc->cursg = sg_next(qc->cursg);
5232 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
5233 * @qc: Command on going
5235 * Transfer Transfer data from/to the ATAPI device.
5238 * Inherited from caller.
5241 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
5243 struct ata_port *ap = qc->ap;
5244 struct ata_device *dev = qc->dev;
5245 unsigned int ireason, bc_lo, bc_hi, bytes;
5246 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
5248 /* Abuse qc->result_tf for temp storage of intermediate TF
5249 * here to save some kernel stack usage.
5250 * For normal completion, qc->result_tf is not relevant. For
5251 * error, qc->result_tf is later overwritten by ata_qc_complete().
5252 * So, the correctness of qc->result_tf is not affected.
5254 ap->ops->tf_read(ap, &qc->result_tf);
5255 ireason = qc->result_tf.nsect;
5256 bc_lo = qc->result_tf.lbam;
5257 bc_hi = qc->result_tf.lbah;
5258 bytes = (bc_hi << 8) | bc_lo;
5260 /* shall be cleared to zero, indicating xfer of data */
5261 if (ireason & (1 << 0))
5264 /* make sure transfer direction matches expected */
5265 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
5266 if (do_write != i_write)
5269 VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
5271 __atapi_pio_bytes(qc, bytes);
5272 ata_altstatus(ap); /* flush */
5277 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
5278 qc->err_mask |= AC_ERR_HSM;
5279 ap->hsm_task_state = HSM_ST_ERR;
5283 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
5284 * @ap: the target ata_port
5288 * 1 if ok in workqueue, 0 otherwise.
5291 static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
5293 if (qc->tf.flags & ATA_TFLAG_POLLING)
5296 if (ap->hsm_task_state == HSM_ST_FIRST) {
5297 if (qc->tf.protocol == ATA_PROT_PIO &&
5298 (qc->tf.flags & ATA_TFLAG_WRITE))
5301 if (is_atapi_taskfile(&qc->tf) &&
5302 !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5310 * ata_hsm_qc_complete - finish a qc running on standard HSM
5311 * @qc: Command to complete
5312 * @in_wq: 1 if called from workqueue, 0 otherwise
5314 * Finish @qc which is running on standard HSM.
5317 * If @in_wq is zero, spin_lock_irqsave(host lock).
5318 * Otherwise, none on entry and grabs host lock.
5320 static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
5322 struct ata_port *ap = qc->ap;
5323 unsigned long flags;
5325 if (ap->ops->error_handler) {
5327 spin_lock_irqsave(ap->lock, flags);
5329 /* EH might have kicked in while host lock is
5332 qc = ata_qc_from_tag(ap, qc->tag);
5334 if (likely(!(qc->err_mask & AC_ERR_HSM))) {
5335 ap->ops->irq_on(ap);
5336 ata_qc_complete(qc);
5338 ata_port_freeze(ap);
5341 spin_unlock_irqrestore(ap->lock, flags);
5343 if (likely(!(qc->err_mask & AC_ERR_HSM)))
5344 ata_qc_complete(qc);
5346 ata_port_freeze(ap);
5350 spin_lock_irqsave(ap->lock, flags);
5351 ap->ops->irq_on(ap);
5352 ata_qc_complete(qc);
5353 spin_unlock_irqrestore(ap->lock, flags);
5355 ata_qc_complete(qc);
5360 * ata_hsm_move - move the HSM to the next state.
5361 * @ap: the target ata_port
5363 * @status: current device status
5364 * @in_wq: 1 if called from workqueue, 0 otherwise
5367 * 1 when poll next status needed, 0 otherwise.
5369 int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
5370 u8 status, int in_wq)
5372 unsigned long flags = 0;
5375 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
5377 /* Make sure ata_qc_issue_prot() does not throw things
5378 * like DMA polling into the workqueue. Notice that
5379 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
5381 WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
5384 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
5385 ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
5387 switch (ap->hsm_task_state) {
5389 /* Send first data block or PACKET CDB */
5391 /* If polling, we will stay in the work queue after
5392 * sending the data. Otherwise, interrupt handler
5393 * takes over after sending the data.
5395 poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
5397 /* check device status */
5398 if (unlikely((status & ATA_DRQ) == 0)) {
5399 /* handle BSY=0, DRQ=0 as error */
5400 if (likely(status & (ATA_ERR | ATA_DF)))
5401 /* device stops HSM for abort/error */
5402 qc->err_mask |= AC_ERR_DEV;
5404 /* HSM violation. Let EH handle this */
5405 qc->err_mask |= AC_ERR_HSM;
5407 ap->hsm_task_state = HSM_ST_ERR;
5411 /* Device should not ask for data transfer (DRQ=1)
5412 * when it finds something wrong.
5413 * We ignore DRQ here and stop the HSM by
5414 * changing hsm_task_state to HSM_ST_ERR and
5415 * let the EH abort the command or reset the device.
5417 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5418 /* Some ATAPI tape drives forget to clear the ERR bit
5419 * when doing the next command (mostly request sense).
5420 * We ignore ERR here to workaround and proceed sending
5423 if (!(qc->dev->horkage & ATA_HORKAGE_STUCK_ERR)) {
5424 ata_port_printk(ap, KERN_WARNING,
5425 "DRQ=1 with device error, "
5426 "dev_stat 0x%X\n", status);
5427 qc->err_mask |= AC_ERR_HSM;
5428 ap->hsm_task_state = HSM_ST_ERR;
5433 /* Send the CDB (atapi) or the first data block (ata pio out).
5434 * During the state transition, interrupt handler shouldn't
5435 * be invoked before the data transfer is complete and
5436 * hsm_task_state is changed. Hence, the following locking.
5439 spin_lock_irqsave(ap->lock, flags);
5441 if (qc->tf.protocol == ATA_PROT_PIO) {
5442 /* PIO data out protocol.
5443 * send first data block.
5446 /* ata_pio_sectors() might change the state
5447 * to HSM_ST_LAST. so, the state is changed here
5448 * before ata_pio_sectors().
5450 ap->hsm_task_state = HSM_ST;
5451 ata_pio_sectors(qc);
5454 atapi_send_cdb(ap, qc);
5457 spin_unlock_irqrestore(ap->lock, flags);
5459 /* if polling, ata_pio_task() handles the rest.
5460 * otherwise, interrupt handler takes over from here.
5465 /* complete command or read/write the data register */
5466 if (qc->tf.protocol == ATA_PROT_ATAPI) {
5467 /* ATAPI PIO protocol */
5468 if ((status & ATA_DRQ) == 0) {
5469 /* No more data to transfer or device error.
5470 * Device error will be tagged in HSM_ST_LAST.
5472 ap->hsm_task_state = HSM_ST_LAST;
5476 /* Device should not ask for data transfer (DRQ=1)
5477 * when it finds something wrong.
5478 * We ignore DRQ here and stop the HSM by
5479 * changing hsm_task_state to HSM_ST_ERR and
5480 * let the EH abort the command or reset the device.
5482 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5483 ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
5484 "device error, dev_stat 0x%X\n",
5486 qc->err_mask |= AC_ERR_HSM;
5487 ap->hsm_task_state = HSM_ST_ERR;
5491 atapi_pio_bytes(qc);
5493 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
5494 /* bad ireason reported by device */
5498 /* ATA PIO protocol */
5499 if (unlikely((status & ATA_DRQ) == 0)) {
5500 /* handle BSY=0, DRQ=0 as error */
5501 if (likely(status & (ATA_ERR | ATA_DF)))
5502 /* device stops HSM for abort/error */
5503 qc->err_mask |= AC_ERR_DEV;
5505 /* HSM violation. Let EH handle this.
5506 * Phantom devices also trigger this
5507 * condition. Mark hint.
5509 qc->err_mask |= AC_ERR_HSM |
5512 ap->hsm_task_state = HSM_ST_ERR;
5516 /* For PIO reads, some devices may ask for
5517 * data transfer (DRQ=1) alone with ERR=1.
5518 * We respect DRQ here and transfer one
5519 * block of junk data before changing the
5520 * hsm_task_state to HSM_ST_ERR.
5522 * For PIO writes, ERR=1 DRQ=1 doesn't make
5523 * sense since the data block has been
5524 * transferred to the device.
5526 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5527 /* data might be corrputed */
5528 qc->err_mask |= AC_ERR_DEV;
5530 if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
5531 ata_pio_sectors(qc);
5532 status = ata_wait_idle(ap);
5535 if (status & (ATA_BUSY | ATA_DRQ))
5536 qc->err_mask |= AC_ERR_HSM;
5538 /* ata_pio_sectors() might change the
5539 * state to HSM_ST_LAST. so, the state
5540 * is changed after ata_pio_sectors().
5542 ap->hsm_task_state = HSM_ST_ERR;
5546 ata_pio_sectors(qc);
5548 if (ap->hsm_task_state == HSM_ST_LAST &&
5549 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
5551 status = ata_wait_idle(ap);
5560 if (unlikely(!ata_ok(status))) {
5561 qc->err_mask |= __ac_err_mask(status);
5562 ap->hsm_task_state = HSM_ST_ERR;
5566 /* no more data to transfer */
5567 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
5568 ap->print_id, qc->dev->devno, status);
5570 WARN_ON(qc->err_mask);
5572 ap->hsm_task_state = HSM_ST_IDLE;
5574 /* complete taskfile transaction */
5575 ata_hsm_qc_complete(qc, in_wq);
5581 /* make sure qc->err_mask is available to
5582 * know what's wrong and recover
5584 WARN_ON(qc->err_mask == 0);
5586 ap->hsm_task_state = HSM_ST_IDLE;
5588 /* complete taskfile transaction */
5589 ata_hsm_qc_complete(qc, in_wq);
5601 static void ata_pio_task(struct work_struct *work)
5603 struct ata_port *ap =
5604 container_of(work, struct ata_port, port_task.work);
5605 struct ata_queued_cmd *qc = ap->port_task_data;
5610 WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5613 * This is purely heuristic. This is a fast path.
5614 * Sometimes when we enter, BSY will be cleared in
5615 * a chk-status or two. If not, the drive is probably seeking
5616 * or something. Snooze for a couple msecs, then
5617 * chk-status again. If still busy, queue delayed work.
5619 status = ata_busy_wait(ap, ATA_BUSY, 5);
5620 if (status & ATA_BUSY) {
5622 status = ata_busy_wait(ap, ATA_BUSY, 10);
5623 if (status & ATA_BUSY) {
5624 ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5630 poll_next = ata_hsm_move(ap, qc, status, 1);
5632 /* another command or interrupt handler
5633 * may be running at this point.
5640 * ata_qc_new - Request an available ATA command, for queueing
5641 * @ap: Port associated with device @dev
5642 * @dev: Device from whom we request an available command structure
5648 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
5650 struct ata_queued_cmd *qc = NULL;
5653 /* no command while frozen */
5654 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5657 /* the last tag is reserved for internal command. */
5658 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5659 if (!test_and_set_bit(i, &ap->qc_allocated)) {
5660 qc = __ata_qc_from_tag(ap, i);
5671 * ata_qc_new_init - Request an available ATA command, and initialize it
5672 * @dev: Device from whom we request an available command structure
5678 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
5680 struct ata_port *ap = dev->link->ap;
5681 struct ata_queued_cmd *qc;
5683 qc = ata_qc_new(ap);
5696 * ata_qc_free - free unused ata_queued_cmd
5697 * @qc: Command to complete
5699 * Designed to free unused ata_queued_cmd object
5700 * in case something prevents using it.
5703 * spin_lock_irqsave(host lock)
5705 void ata_qc_free(struct ata_queued_cmd *qc)
5707 struct ata_port *ap = qc->ap;
5710 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5714 if (likely(ata_tag_valid(tag))) {
5715 qc->tag = ATA_TAG_POISON;
5716 clear_bit(tag, &ap->qc_allocated);
5720 void __ata_qc_complete(struct ata_queued_cmd *qc)
5722 struct ata_port *ap = qc->ap;
5723 struct ata_link *link = qc->dev->link;
5725 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5726 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
5728 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
5731 /* command should be marked inactive atomically with qc completion */
5732 if (qc->tf.protocol == ATA_PROT_NCQ) {
5733 link->sactive &= ~(1 << qc->tag);
5735 ap->nr_active_links--;
5737 link->active_tag = ATA_TAG_POISON;
5738 ap->nr_active_links--;
5741 /* clear exclusive status */
5742 if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
5743 ap->excl_link == link))
5744 ap->excl_link = NULL;
5746 /* atapi: mark qc as inactive to prevent the interrupt handler
5747 * from completing the command twice later, before the error handler
5748 * is called. (when rc != 0 and atapi request sense is needed)
5750 qc->flags &= ~ATA_QCFLAG_ACTIVE;
5751 ap->qc_active &= ~(1 << qc->tag);
5753 /* call completion callback */
5754 qc->complete_fn(qc);
5757 static void fill_result_tf(struct ata_queued_cmd *qc)
5759 struct ata_port *ap = qc->ap;
5761 qc->result_tf.flags = qc->tf.flags;
5762 ap->ops->tf_read(ap, &qc->result_tf);
5766 * ata_qc_complete - Complete an active ATA command
5767 * @qc: Command to complete
5768 * @err_mask: ATA Status register contents
5770 * Indicate to the mid and upper layers that an ATA
5771 * command has completed, with either an ok or not-ok status.
5774 * spin_lock_irqsave(host lock)
5776 void ata_qc_complete(struct ata_queued_cmd *qc)
5778 struct ata_port *ap = qc->ap;
5780 /* XXX: New EH and old EH use different mechanisms to
5781 * synchronize EH with regular execution path.
5783 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
5784 * Normal execution path is responsible for not accessing a
5785 * failed qc. libata core enforces the rule by returning NULL
5786 * from ata_qc_from_tag() for failed qcs.
5788 * Old EH depends on ata_qc_complete() nullifying completion
5789 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
5790 * not synchronize with interrupt handler. Only PIO task is
5793 if (ap->ops->error_handler) {
5794 struct ata_device *dev = qc->dev;
5795 struct ata_eh_info *ehi = &dev->link->eh_info;
5797 WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5799 if (unlikely(qc->err_mask))
5800 qc->flags |= ATA_QCFLAG_FAILED;
5802 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
5803 if (!ata_tag_internal(qc->tag)) {
5804 /* always fill result TF for failed qc */
5806 ata_qc_schedule_eh(qc);
5811 /* read result TF if requested */
5812 if (qc->flags & ATA_QCFLAG_RESULT_TF)
5815 /* Some commands need post-processing after successful
5818 switch (qc->tf.command) {
5819 case ATA_CMD_SET_FEATURES:
5820 if (qc->tf.feature != SETFEATURES_WC_ON &&
5821 qc->tf.feature != SETFEATURES_WC_OFF)
5824 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
5825 case ATA_CMD_SET_MULTI: /* multi_count changed */
5826 /* revalidate device */
5827 ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
5828 ata_port_schedule_eh(ap);
5832 dev->flags |= ATA_DFLAG_SLEEPING;
5836 __ata_qc_complete(qc);
5838 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
5841 /* read result TF if failed or requested */
5842 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
5845 __ata_qc_complete(qc);
5850 * ata_qc_complete_multiple - Complete multiple qcs successfully
5851 * @ap: port in question
5852 * @qc_active: new qc_active mask
5853 * @finish_qc: LLDD callback invoked before completing a qc
5855 * Complete in-flight commands. This functions is meant to be
5856 * called from low-level driver's interrupt routine to complete
5857 * requests normally. ap->qc_active and @qc_active is compared
5858 * and commands are completed accordingly.
5861 * spin_lock_irqsave(host lock)
5864 * Number of completed commands on success, -errno otherwise.
5866 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
5867 void (*finish_qc)(struct ata_queued_cmd *))
5873 done_mask = ap->qc_active ^ qc_active;
5875 if (unlikely(done_mask & qc_active)) {
5876 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
5877 "(%08x->%08x)\n", ap->qc_active, qc_active);
5881 for (i = 0; i < ATA_MAX_QUEUE; i++) {
5882 struct ata_queued_cmd *qc;
5884 if (!(done_mask & (1 << i)))
5887 if ((qc = ata_qc_from_tag(ap, i))) {
5890 ata_qc_complete(qc);
5898 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
5900 struct ata_port *ap = qc->ap;
5902 switch (qc->tf.protocol) {
5905 case ATA_PROT_ATAPI_DMA:
5908 case ATA_PROT_ATAPI:
5910 if (ap->flags & ATA_FLAG_PIO_DMA)
5923 * ata_qc_issue - issue taskfile to device
5924 * @qc: command to issue to device
5926 * Prepare an ATA command to submission to device.
5927 * This includes mapping the data into a DMA-able
5928 * area, filling in the S/G table, and finally
5929 * writing the taskfile to hardware, starting the command.
5932 * spin_lock_irqsave(host lock)
5934 void ata_qc_issue(struct ata_queued_cmd *qc)
5936 struct ata_port *ap = qc->ap;
5937 struct ata_link *link = qc->dev->link;
5939 /* Make sure only one non-NCQ command is outstanding. The
5940 * check is skipped for old EH because it reuses active qc to
5941 * request ATAPI sense.
5943 WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5945 if (qc->tf.protocol == ATA_PROT_NCQ) {
5946 WARN_ON(link->sactive & (1 << qc->tag));
5949 ap->nr_active_links++;
5950 link->sactive |= 1 << qc->tag;
5952 WARN_ON(link->sactive);
5954 ap->nr_active_links++;
5955 link->active_tag = qc->tag;
5958 qc->flags |= ATA_QCFLAG_ACTIVE;
5959 ap->qc_active |= 1 << qc->tag;
5961 if (ata_should_dma_map(qc)) {
5962 if (qc->flags & ATA_QCFLAG_SG) {
5963 if (ata_sg_setup(qc))
5965 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
5966 if (ata_sg_setup_one(qc))
5970 qc->flags &= ~ATA_QCFLAG_DMAMAP;
5973 /* if device is sleeping, schedule softreset and abort the link */
5974 if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
5975 link->eh_info.action |= ATA_EH_SOFTRESET;
5976 ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
5977 ata_link_abort(link);
5981 ap->ops->qc_prep(qc);
5983 qc->err_mask |= ap->ops->qc_issue(qc);
5984 if (unlikely(qc->err_mask))
5989 qc->flags &= ~ATA_QCFLAG_DMAMAP;
5990 qc->err_mask |= AC_ERR_SYSTEM;
5992 ata_qc_complete(qc);
5996 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
5997 * @qc: command to issue to device
5999 * Using various libata functions and hooks, this function
6000 * starts an ATA command. ATA commands are grouped into
6001 * classes called "protocols", and issuing each type of protocol
6002 * is slightly different.
6004 * May be used as the qc_issue() entry in ata_port_operations.
6007 * spin_lock_irqsave(host lock)
6010 * Zero on success, AC_ERR_* mask on failure
6013 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
6015 struct ata_port *ap = qc->ap;
6017 /* Use polling pio if the LLD doesn't handle
6018 * interrupt driven pio and atapi CDB interrupt.
6020 if (ap->flags & ATA_FLAG_PIO_POLLING) {
6021 switch (qc->tf.protocol) {
6023 case ATA_PROT_NODATA:
6024 case ATA_PROT_ATAPI:
6025 case ATA_PROT_ATAPI_NODATA:
6026 qc->tf.flags |= ATA_TFLAG_POLLING;
6028 case ATA_PROT_ATAPI_DMA:
6029 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
6030 /* see ata_dma_blacklisted() */
6038 /* select the device */
6039 ata_dev_select(ap, qc->dev->devno, 1, 0);
6041 /* start the command */
6042 switch (qc->tf.protocol) {
6043 case ATA_PROT_NODATA:
6044 if (qc->tf.flags & ATA_TFLAG_POLLING)
6045 ata_qc_set_polling(qc);
6047 ata_tf_to_host(ap, &qc->tf);
6048 ap->hsm_task_state = HSM_ST_LAST;
6050 if (qc->tf.flags & ATA_TFLAG_POLLING)
6051 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6056 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
6058 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
6059 ap->ops->bmdma_setup(qc); /* set up bmdma */
6060 ap->ops->bmdma_start(qc); /* initiate bmdma */
6061 ap->hsm_task_state = HSM_ST_LAST;
6065 if (qc->tf.flags & ATA_TFLAG_POLLING)
6066 ata_qc_set_polling(qc);
6068 ata_tf_to_host(ap, &qc->tf);
6070 if (qc->tf.flags & ATA_TFLAG_WRITE) {
6071 /* PIO data out protocol */
6072 ap->hsm_task_state = HSM_ST_FIRST;
6073 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6075 /* always send first data block using
6076 * the ata_pio_task() codepath.
6079 /* PIO data in protocol */
6080 ap->hsm_task_state = HSM_ST;
6082 if (qc->tf.flags & ATA_TFLAG_POLLING)
6083 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6085 /* if polling, ata_pio_task() handles the rest.
6086 * otherwise, interrupt handler takes over from here.
6092 case ATA_PROT_ATAPI:
6093 case ATA_PROT_ATAPI_NODATA:
6094 if (qc->tf.flags & ATA_TFLAG_POLLING)
6095 ata_qc_set_polling(qc);
6097 ata_tf_to_host(ap, &qc->tf);
6099 ap->hsm_task_state = HSM_ST_FIRST;
6101 /* send cdb by polling if no cdb interrupt */
6102 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
6103 (qc->tf.flags & ATA_TFLAG_POLLING))
6104 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6107 case ATA_PROT_ATAPI_DMA:
6108 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
6110 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
6111 ap->ops->bmdma_setup(qc); /* set up bmdma */
6112 ap->hsm_task_state = HSM_ST_FIRST;
6114 /* send cdb by polling if no cdb interrupt */
6115 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
6116 ata_port_queue_task(ap, ata_pio_task, qc, 0);
6121 return AC_ERR_SYSTEM;
6128 * ata_host_intr - Handle host interrupt for given (port, task)
6129 * @ap: Port on which interrupt arrived (possibly...)
6130 * @qc: Taskfile currently active in engine
6132 * Handle host interrupt for given queued command. Currently,
6133 * only DMA interrupts are handled. All other commands are
6134 * handled via polling with interrupts disabled (nIEN bit).
6137 * spin_lock_irqsave(host lock)
6140 * One if interrupt was handled, zero if not (shared irq).
6143 inline unsigned int ata_host_intr(struct ata_port *ap,
6144 struct ata_queued_cmd *qc)
6146 struct ata_eh_info *ehi = &ap->link.eh_info;
6147 u8 status, host_stat = 0;
6149 VPRINTK("ata%u: protocol %d task_state %d\n",
6150 ap->print_id, qc->tf.protocol, ap->hsm_task_state);
6152 /* Check whether we are expecting interrupt in this state */
6153 switch (ap->hsm_task_state) {
6155 /* Some pre-ATAPI-4 devices assert INTRQ
6156 * at this state when ready to receive CDB.
6159 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
6160 * The flag was turned on only for atapi devices.
6161 * No need to check is_atapi_taskfile(&qc->tf) again.
6163 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
6167 if (qc->tf.protocol == ATA_PROT_DMA ||
6168 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
6169 /* check status of DMA engine */
6170 host_stat = ap->ops->bmdma_status(ap);
6171 VPRINTK("ata%u: host_stat 0x%X\n",
6172 ap->print_id, host_stat);
6174 /* if it's not our irq... */
6175 if (!(host_stat & ATA_DMA_INTR))
6178 /* before we do anything else, clear DMA-Start bit */
6179 ap->ops->bmdma_stop(qc);
6181 if (unlikely(host_stat & ATA_DMA_ERR)) {
6182 /* error when transfering data to/from memory */
6183 qc->err_mask |= AC_ERR_HOST_BUS;
6184 ap->hsm_task_state = HSM_ST_ERR;
6194 /* check altstatus */
6195 status = ata_altstatus(ap);
6196 if (status & ATA_BUSY)
6199 /* check main status, clearing INTRQ */
6200 status = ata_chk_status(ap);
6201 if (unlikely(status & ATA_BUSY))
6204 /* ack bmdma irq events */
6205 ap->ops->irq_clear(ap);
6207 ata_hsm_move(ap, qc, status, 0);
6209 if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA ||
6210 qc->tf.protocol == ATA_PROT_ATAPI_DMA))
6211 ata_ehi_push_desc(ehi, "BMDMA stat 0x%x", host_stat);
6213 return 1; /* irq handled */
6216 ap->stats.idle_irq++;
6219 if ((ap->stats.idle_irq % 1000) == 0) {
6221 ap->ops->irq_clear(ap);
6222 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
6226 return 0; /* irq not handled */
6230 * ata_interrupt - Default ATA host interrupt handler
6231 * @irq: irq line (unused)
6232 * @dev_instance: pointer to our ata_host information structure
6234 * Default interrupt handler for PCI IDE devices. Calls
6235 * ata_host_intr() for each port that is not disabled.
6238 * Obtains host lock during operation.
6241 * IRQ_NONE or IRQ_HANDLED.
6244 irqreturn_t ata_interrupt(int irq, void *dev_instance)
6246 struct ata_host *host = dev_instance;
6248 unsigned int handled = 0;
6249 unsigned long flags;
6251 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
6252 spin_lock_irqsave(&host->lock, flags);
6254 for (i = 0; i < host->n_ports; i++) {
6255 struct ata_port *ap;
6257 ap = host->ports[i];
6259 !(ap->flags & ATA_FLAG_DISABLED)) {
6260 struct ata_queued_cmd *qc;
6262 qc = ata_qc_from_tag(ap, ap->link.active_tag);
6263 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
6264 (qc->flags & ATA_QCFLAG_ACTIVE))
6265 handled |= ata_host_intr(ap, qc);
6269 spin_unlock_irqrestore(&host->lock, flags);
6271 return IRQ_RETVAL(handled);
6275 * sata_scr_valid - test whether SCRs are accessible
6276 * @link: ATA link to test SCR accessibility for
6278 * Test whether SCRs are accessible for @link.
6284 * 1 if SCRs are accessible, 0 otherwise.
6286 int sata_scr_valid(struct ata_link *link)
6288 struct ata_port *ap = link->ap;
6290 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
6294 * sata_scr_read - read SCR register of the specified port
6295 * @link: ATA link to read SCR for
6297 * @val: Place to store read value
6299 * Read SCR register @reg of @link into *@val. This function is
6300 * guaranteed to succeed if @link is ap->link, the cable type of
6301 * the port is SATA and the port implements ->scr_read.
6304 * None if @link is ap->link. Kernel thread context otherwise.
6307 * 0 on success, negative errno on failure.
6309 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
6311 if (ata_is_host_link(link)) {
6312 struct ata_port *ap = link->ap;
6314 if (sata_scr_valid(link))
6315 return ap->ops->scr_read(ap, reg, val);
6319 return sata_pmp_scr_read(link, reg, val);
6323 * sata_scr_write - write SCR register of the specified port
6324 * @link: ATA link to write SCR for
6325 * @reg: SCR to write
6326 * @val: value to write
6328 * Write @val to SCR register @reg of @link. This function is
6329 * guaranteed to succeed if @link is ap->link, the cable type of
6330 * the port is SATA and the port implements ->scr_read.
6333 * None if @link is ap->link. Kernel thread context otherwise.
6336 * 0 on success, negative errno on failure.
6338 int sata_scr_write(struct ata_link *link, int reg, u32 val)
6340 if (ata_is_host_link(link)) {
6341 struct ata_port *ap = link->ap;
6343 if (sata_scr_valid(link))
6344 return ap->ops->scr_write(ap, reg, val);
6348 return sata_pmp_scr_write(link, reg, val);
6352 * sata_scr_write_flush - write SCR register of the specified port and flush
6353 * @link: ATA link to write SCR for
6354 * @reg: SCR to write
6355 * @val: value to write
6357 * This function is identical to sata_scr_write() except that this
6358 * function performs flush after writing to the register.
6361 * None if @link is ap->link. Kernel thread context otherwise.
6364 * 0 on success, negative errno on failure.
6366 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
6368 if (ata_is_host_link(link)) {
6369 struct ata_port *ap = link->ap;
6372 if (sata_scr_valid(link)) {
6373 rc = ap->ops->scr_write(ap, reg, val);
6375 rc = ap->ops->scr_read(ap, reg, &val);
6381 return sata_pmp_scr_write(link, reg, val);
6385 * ata_link_online - test whether the given link is online
6386 * @link: ATA link to test
6388 * Test whether @link is online. Note that this function returns
6389 * 0 if online status of @link cannot be obtained, so
6390 * ata_link_online(link) != !ata_link_offline(link).
6396 * 1 if the port online status is available and online.
6398 int ata_link_online(struct ata_link *link)
6402 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
6403 (sstatus & 0xf) == 0x3)
6409 * ata_link_offline - test whether the given link is offline
6410 * @link: ATA link to test
6412 * Test whether @link is offline. Note that this function
6413 * returns 0 if offline status of @link cannot be obtained, so
6414 * ata_link_online(link) != !ata_link_offline(link).
6420 * 1 if the port offline status is available and offline.
6422 int ata_link_offline(struct ata_link *link)
6426 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
6427 (sstatus & 0xf) != 0x3)
6432 int ata_flush_cache(struct ata_device *dev)
6434 unsigned int err_mask;
6437 if (!ata_try_flush_cache(dev))
6440 if (dev->flags & ATA_DFLAG_FLUSH_EXT)
6441 cmd = ATA_CMD_FLUSH_EXT;
6443 cmd = ATA_CMD_FLUSH;
6445 /* This is wrong. On a failed flush we get back the LBA of the lost
6446 sector and we should (assuming it wasn't aborted as unknown) issue
6447 a further flush command to continue the writeback until it
6449 err_mask = ata_do_simple_cmd(dev, cmd);
6451 ata_dev_printk(dev, KERN_ERR, "failed to flush cache\n");
6459 static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
6460 unsigned int action, unsigned int ehi_flags,
6463 unsigned long flags;
6466 for (i = 0; i < host->n_ports; i++) {
6467 struct ata_port *ap = host->ports[i];
6468 struct ata_link *link;
6470 /* Previous resume operation might still be in
6471 * progress. Wait for PM_PENDING to clear.
6473 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
6474 ata_port_wait_eh(ap);
6475 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
6478 /* request PM ops to EH */
6479 spin_lock_irqsave(ap->lock, flags);
6484 ap->pm_result = &rc;
6487 ap->pflags |= ATA_PFLAG_PM_PENDING;
6488 __ata_port_for_each_link(link, ap) {
6489 link->eh_info.action |= action;
6490 link->eh_info.flags |= ehi_flags;
6493 ata_port_schedule_eh(ap);
6495 spin_unlock_irqrestore(ap->lock, flags);
6497 /* wait and check result */
6499 ata_port_wait_eh(ap);
6500 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
6510 * ata_host_suspend - suspend host
6511 * @host: host to suspend
6514 * Suspend @host. Actual operation is performed by EH. This
6515 * function requests EH to perform PM operations and waits for EH
6519 * Kernel thread context (may sleep).
6522 * 0 on success, -errno on failure.
6524 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
6529 * disable link pm on all ports before requesting
6532 ata_lpm_enable(host);
6534 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
6536 host->dev->power.power_state = mesg;
6541 * ata_host_resume - resume host
6542 * @host: host to resume
6544 * Resume @host. Actual operation is performed by EH. This
6545 * function requests EH to perform PM operations and returns.
6546 * Note that all resume operations are performed parallely.
6549 * Kernel thread context (may sleep).
6551 void ata_host_resume(struct ata_host *host)
6553 ata_host_request_pm(host, PMSG_ON, ATA_EH_SOFTRESET,
6554 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
6555 host->dev->power.power_state = PMSG_ON;
6557 /* reenable link pm */
6558 ata_lpm_disable(host);
6563 * ata_port_start - Set port up for dma.
6564 * @ap: Port to initialize
6566 * Called just after data structures for each port are
6567 * initialized. Allocates space for PRD table.
6569 * May be used as the port_start() entry in ata_port_operations.
6572 * Inherited from caller.
6574 int ata_port_start(struct ata_port *ap)
6576 struct device *dev = ap->dev;
6579 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
6584 rc = ata_pad_alloc(ap, dev);
6588 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
6589 (unsigned long long)ap->prd_dma);
6594 * ata_dev_init - Initialize an ata_device structure
6595 * @dev: Device structure to initialize
6597 * Initialize @dev in preparation for probing.
6600 * Inherited from caller.
6602 void ata_dev_init(struct ata_device *dev)
6604 struct ata_link *link = dev->link;
6605 struct ata_port *ap = link->ap;
6606 unsigned long flags;
6608 /* SATA spd limit is bound to the first device */
6609 link->sata_spd_limit = link->hw_sata_spd_limit;
6612 /* High bits of dev->flags are used to record warm plug
6613 * requests which occur asynchronously. Synchronize using
6616 spin_lock_irqsave(ap->lock, flags);
6617 dev->flags &= ~ATA_DFLAG_INIT_MASK;
6619 spin_unlock_irqrestore(ap->lock, flags);
6621 memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
6622 sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6623 dev->pio_mask = UINT_MAX;
6624 dev->mwdma_mask = UINT_MAX;
6625 dev->udma_mask = UINT_MAX;
6629 * ata_link_init - Initialize an ata_link structure
6630 * @ap: ATA port link is attached to
6631 * @link: Link structure to initialize
6632 * @pmp: Port multiplier port number
6637 * Kernel thread context (may sleep)
6639 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
6643 /* clear everything except for devices */
6644 memset(link, 0, offsetof(struct ata_link, device[0]));
6648 link->active_tag = ATA_TAG_POISON;
6649 link->hw_sata_spd_limit = UINT_MAX;
6651 /* can't use iterator, ap isn't initialized yet */
6652 for (i = 0; i < ATA_MAX_DEVICES; i++) {
6653 struct ata_device *dev = &link->device[i];
6656 dev->devno = dev - link->device;
6662 * sata_link_init_spd - Initialize link->sata_spd_limit
6663 * @link: Link to configure sata_spd_limit for
6665 * Initialize @link->[hw_]sata_spd_limit to the currently
6669 * Kernel thread context (may sleep).
6672 * 0 on success, -errno on failure.
6674 int sata_link_init_spd(struct ata_link *link)
6679 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
6683 spd = (scontrol >> 4) & 0xf;
6685 link->hw_sata_spd_limit &= (1 << spd) - 1;
6687 link->sata_spd_limit = link->hw_sata_spd_limit;
6693 * ata_port_alloc - allocate and initialize basic ATA port resources
6694 * @host: ATA host this allocated port belongs to
6696 * Allocate and initialize basic ATA port resources.
6699 * Allocate ATA port on success, NULL on failure.
6702 * Inherited from calling layer (may sleep).
6704 struct ata_port *ata_port_alloc(struct ata_host *host)
6706 struct ata_port *ap;
6710 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
6714 ap->pflags |= ATA_PFLAG_INITIALIZING;
6715 ap->lock = &host->lock;
6716 ap->flags = ATA_FLAG_DISABLED;
6718 ap->ctl = ATA_DEVCTL_OBS;
6720 ap->dev = host->dev;
6721 ap->last_ctl = 0xFF;
6723 #if defined(ATA_VERBOSE_DEBUG)
6724 /* turn on all debugging levels */
6725 ap->msg_enable = 0x00FF;
6726 #elif defined(ATA_DEBUG)
6727 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
6729 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6732 INIT_DELAYED_WORK(&ap->port_task, NULL);
6733 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
6734 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
6735 INIT_LIST_HEAD(&ap->eh_done_q);
6736 init_waitqueue_head(&ap->eh_wait_q);
6737 init_timer_deferrable(&ap->fastdrain_timer);
6738 ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
6739 ap->fastdrain_timer.data = (unsigned long)ap;
6741 ap->cbl = ATA_CBL_NONE;
6743 ata_link_init(ap, &ap->link, 0);
6746 ap->stats.unhandled_irq = 1;
6747 ap->stats.idle_irq = 1;
6752 static void ata_host_release(struct device *gendev, void *res)
6754 struct ata_host *host = dev_get_drvdata(gendev);
6757 for (i = 0; i < host->n_ports; i++) {
6758 struct ata_port *ap = host->ports[i];
6764 scsi_host_put(ap->scsi_host);
6766 kfree(ap->pmp_link);
6768 host->ports[i] = NULL;
6771 dev_set_drvdata(gendev, NULL);
6775 * ata_host_alloc - allocate and init basic ATA host resources
6776 * @dev: generic device this host is associated with
6777 * @max_ports: maximum number of ATA ports associated with this host
6779 * Allocate and initialize basic ATA host resources. LLD calls
6780 * this function to allocate a host, initializes it fully and
6781 * attaches it using ata_host_register().
6783 * @max_ports ports are allocated and host->n_ports is
6784 * initialized to @max_ports. The caller is allowed to decrease
6785 * host->n_ports before calling ata_host_register(). The unused
6786 * ports will be automatically freed on registration.
6789 * Allocate ATA host on success, NULL on failure.
6792 * Inherited from calling layer (may sleep).
6794 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
6796 struct ata_host *host;
6802 if (!devres_open_group(dev, NULL, GFP_KERNEL))
6805 /* alloc a container for our list of ATA ports (buses) */
6806 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
6807 /* alloc a container for our list of ATA ports (buses) */
6808 host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
6812 devres_add(dev, host);
6813 dev_set_drvdata(dev, host);
6815 spin_lock_init(&host->lock);
6817 host->n_ports = max_ports;
6819 /* allocate ports bound to this host */
6820 for (i = 0; i < max_ports; i++) {
6821 struct ata_port *ap;
6823 ap = ata_port_alloc(host);
6828 host->ports[i] = ap;
6831 devres_remove_group(dev, NULL);
6835 devres_release_group(dev, NULL);
6840 * ata_host_alloc_pinfo - alloc host and init with port_info array
6841 * @dev: generic device this host is associated with
6842 * @ppi: array of ATA port_info to initialize host with
6843 * @n_ports: number of ATA ports attached to this host
6845 * Allocate ATA host and initialize with info from @ppi. If NULL
6846 * terminated, @ppi may contain fewer entries than @n_ports. The
6847 * last entry will be used for the remaining ports.
6850 * Allocate ATA host on success, NULL on failure.
6853 * Inherited from calling layer (may sleep).
6855 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
6856 const struct ata_port_info * const * ppi,
6859 const struct ata_port_info *pi;
6860 struct ata_host *host;
6863 host = ata_host_alloc(dev, n_ports);
6867 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
6868 struct ata_port *ap = host->ports[i];
6873 ap->pio_mask = pi->pio_mask;
6874 ap->mwdma_mask = pi->mwdma_mask;
6875 ap->udma_mask = pi->udma_mask;
6876 ap->flags |= pi->flags;
6877 ap->link.flags |= pi->link_flags;
6878 ap->ops = pi->port_ops;
6880 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
6881 host->ops = pi->port_ops;
6882 if (!host->private_data && pi->private_data)
6883 host->private_data = pi->private_data;
6889 static void ata_host_stop(struct device *gendev, void *res)
6891 struct ata_host *host = dev_get_drvdata(gendev);
6894 WARN_ON(!(host->flags & ATA_HOST_STARTED));
6896 for (i = 0; i < host->n_ports; i++) {
6897 struct ata_port *ap = host->ports[i];
6899 if (ap->ops->port_stop)
6900 ap->ops->port_stop(ap);
6903 if (host->ops->host_stop)
6904 host->ops->host_stop(host);
6908 * ata_host_start - start and freeze ports of an ATA host
6909 * @host: ATA host to start ports for
6911 * Start and then freeze ports of @host. Started status is
6912 * recorded in host->flags, so this function can be called
6913 * multiple times. Ports are guaranteed to get started only
6914 * once. If host->ops isn't initialized yet, its set to the
6915 * first non-dummy port ops.
6918 * Inherited from calling layer (may sleep).
6921 * 0 if all ports are started successfully, -errno otherwise.
6923 int ata_host_start(struct ata_host *host)
6926 void *start_dr = NULL;
6929 if (host->flags & ATA_HOST_STARTED)
6932 for (i = 0; i < host->n_ports; i++) {
6933 struct ata_port *ap = host->ports[i];
6935 if (!host->ops && !ata_port_is_dummy(ap))
6936 host->ops = ap->ops;
6938 if (ap->ops->port_stop)
6942 if (host->ops->host_stop)
6946 start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
6951 for (i = 0; i < host->n_ports; i++) {
6952 struct ata_port *ap = host->ports[i];
6954 if (ap->ops->port_start) {
6955 rc = ap->ops->port_start(ap);
6958 dev_printk(KERN_ERR, host->dev, "failed to start port %d (errno=%d)\n", i, rc);
6962 ata_eh_freeze_port(ap);
6966 devres_add(host->dev, start_dr);
6967 host->flags |= ATA_HOST_STARTED;
6972 struct ata_port *ap = host->ports[i];
6974 if (ap->ops->port_stop)
6975 ap->ops->port_stop(ap);
6977 devres_free(start_dr);
6982 * ata_sas_host_init - Initialize a host struct
6983 * @host: host to initialize
6984 * @dev: device host is attached to
6985 * @flags: host flags
6989 * PCI/etc. bus probe sem.
6992 /* KILLME - the only user left is ipr */
6993 void ata_host_init(struct ata_host *host, struct device *dev,
6994 unsigned long flags, const struct ata_port_operations *ops)
6996 spin_lock_init(&host->lock);
6998 host->flags = flags;
7003 * ata_host_register - register initialized ATA host
7004 * @host: ATA host to register
7005 * @sht: template for SCSI host
7007 * Register initialized ATA host. @host is allocated using
7008 * ata_host_alloc() and fully initialized by LLD. This function
7009 * starts ports, registers @host with ATA and SCSI layers and
7010 * probe registered devices.
7013 * Inherited from calling layer (may sleep).
7016 * 0 on success, -errno otherwise.
7018 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
7022 /* host must have been started */
7023 if (!(host->flags & ATA_HOST_STARTED)) {
7024 dev_printk(KERN_ERR, host->dev,
7025 "BUG: trying to register unstarted host\n");
7030 /* Blow away unused ports. This happens when LLD can't
7031 * determine the exact number of ports to allocate at
7034 for (i = host->n_ports; host->ports[i]; i++)
7035 kfree(host->ports[i]);
7037 /* give ports names and add SCSI hosts */
7038 for (i = 0; i < host->n_ports; i++)
7039 host->ports[i]->print_id = ata_print_id++;
7041 rc = ata_scsi_add_hosts(host, sht);
7045 /* associate with ACPI nodes */
7046 ata_acpi_associate(host);
7048 /* set cable, sata_spd_limit and report */
7049 for (i = 0; i < host->n_ports; i++) {
7050 struct ata_port *ap = host->ports[i];
7051 unsigned long xfer_mask;
7053 /* set SATA cable type if still unset */
7054 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
7055 ap->cbl = ATA_CBL_SATA;
7057 /* init sata_spd_limit to the current value */
7058 sata_link_init_spd(&ap->link);
7060 /* print per-port info to dmesg */
7061 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
7064 if (!ata_port_is_dummy(ap)) {
7065 ata_port_printk(ap, KERN_INFO,
7066 "%cATA max %s %s\n",
7067 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
7068 ata_mode_string(xfer_mask),
7069 ap->link.eh_info.desc);
7070 ata_ehi_clear_desc(&ap->link.eh_info);
7072 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
7075 /* perform each probe synchronously */
7076 DPRINTK("probe begin\n");
7077 for (i = 0; i < host->n_ports; i++) {
7078 struct ata_port *ap = host->ports[i];
7082 if (ap->ops->error_handler) {
7083 struct ata_eh_info *ehi = &ap->link.eh_info;
7084 unsigned long flags;
7088 /* kick EH for boot probing */
7089 spin_lock_irqsave(ap->lock, flags);
7092 (1 << ata_link_max_devices(&ap->link)) - 1;
7093 ehi->action |= ATA_EH_SOFTRESET;
7094 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
7096 ap->pflags &= ~ATA_PFLAG_INITIALIZING;
7097 ap->pflags |= ATA_PFLAG_LOADING;
7098 ata_port_schedule_eh(ap);
7100 spin_unlock_irqrestore(ap->lock, flags);
7102 /* wait for EH to finish */
7103 ata_port_wait_eh(ap);
7105 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
7106 rc = ata_bus_probe(ap);
7107 DPRINTK("ata%u: bus probe end\n", ap->print_id);
7110 /* FIXME: do something useful here?
7111 * Current libata behavior will
7112 * tear down everything when
7113 * the module is removed
7114 * or the h/w is unplugged.
7120 /* probes are done, now scan each port's disk(s) */
7121 DPRINTK("host probe begin\n");
7122 for (i = 0; i < host->n_ports; i++) {
7123 struct ata_port *ap = host->ports[i];
7125 ata_scsi_scan_host(ap, 1);
7126 ata_lpm_schedule(ap, ap->pm_policy);
7133 * ata_host_activate - start host, request IRQ and register it
7134 * @host: target ATA host
7135 * @irq: IRQ to request
7136 * @irq_handler: irq_handler used when requesting IRQ
7137 * @irq_flags: irq_flags used when requesting IRQ
7138 * @sht: scsi_host_template to use when registering the host
7140 * After allocating an ATA host and initializing it, most libata
7141 * LLDs perform three steps to activate the host - start host,
7142 * request IRQ and register it. This helper takes necessasry
7143 * arguments and performs the three steps in one go.
7145 * An invalid IRQ skips the IRQ registration and expects the host to
7146 * have set polling mode on the port. In this case, @irq_handler
7150 * Inherited from calling layer (may sleep).
7153 * 0 on success, -errno otherwise.
7155 int ata_host_activate(struct ata_host *host, int irq,
7156 irq_handler_t irq_handler, unsigned long irq_flags,
7157 struct scsi_host_template *sht)
7161 rc = ata_host_start(host);
7165 /* Special case for polling mode */
7167 WARN_ON(irq_handler);
7168 return ata_host_register(host, sht);
7171 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
7172 dev_driver_string(host->dev), host);
7176 for (i = 0; i < host->n_ports; i++)
7177 ata_port_desc(host->ports[i], "irq %d", irq);
7179 rc = ata_host_register(host, sht);
7180 /* if failed, just free the IRQ and leave ports alone */
7182 devm_free_irq(host->dev, irq, host);
7188 * ata_port_detach - Detach ATA port in prepration of device removal
7189 * @ap: ATA port to be detached
7191 * Detach all ATA devices and the associated SCSI devices of @ap;
7192 * then, remove the associated SCSI host. @ap is guaranteed to
7193 * be quiescent on return from this function.
7196 * Kernel thread context (may sleep).
7198 static void ata_port_detach(struct ata_port *ap)
7200 unsigned long flags;
7201 struct ata_link *link;
7202 struct ata_device *dev;
7204 if (!ap->ops->error_handler)
7207 /* tell EH we're leaving & flush EH */
7208 spin_lock_irqsave(ap->lock, flags);
7209 ap->pflags |= ATA_PFLAG_UNLOADING;
7210 spin_unlock_irqrestore(ap->lock, flags);
7212 ata_port_wait_eh(ap);
7214 /* EH is now guaranteed to see UNLOADING - EH context belongs
7215 * to us. Disable all existing devices.
7217 ata_port_for_each_link(link, ap) {
7218 ata_link_for_each_dev(dev, link)
7219 ata_dev_disable(dev);
7222 /* Final freeze & EH. All in-flight commands are aborted. EH
7223 * will be skipped and retrials will be terminated with bad
7226 spin_lock_irqsave(ap->lock, flags);
7227 ata_port_freeze(ap); /* won't be thawed */
7228 spin_unlock_irqrestore(ap->lock, flags);
7230 ata_port_wait_eh(ap);
7231 cancel_rearming_delayed_work(&ap->hotplug_task);
7234 /* remove the associated SCSI host */
7235 scsi_remove_host(ap->scsi_host);
7239 * ata_host_detach - Detach all ports of an ATA host
7240 * @host: Host to detach
7242 * Detach all ports of @host.
7245 * Kernel thread context (may sleep).
7247 void ata_host_detach(struct ata_host *host)
7251 for (i = 0; i < host->n_ports; i++)
7252 ata_port_detach(host->ports[i]);
7254 /* the host is dead now, dissociate ACPI */
7255 ata_acpi_dissociate(host);
7259 * ata_std_ports - initialize ioaddr with standard port offsets.
7260 * @ioaddr: IO address structure to be initialized
7262 * Utility function which initializes data_addr, error_addr,
7263 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
7264 * device_addr, status_addr, and command_addr to standard offsets
7265 * relative to cmd_addr.
7267 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
7270 void ata_std_ports(struct ata_ioports *ioaddr)
7272 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
7273 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
7274 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
7275 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
7276 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
7277 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
7278 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
7279 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
7280 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
7281 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
7288 * ata_pci_remove_one - PCI layer callback for device removal
7289 * @pdev: PCI device that was removed
7291 * PCI layer indicates to libata via this hook that hot-unplug or
7292 * module unload event has occurred. Detach all ports. Resource
7293 * release is handled via devres.
7296 * Inherited from PCI layer (may sleep).
7298 void ata_pci_remove_one(struct pci_dev *pdev)
7300 struct device *dev = &pdev->dev;
7301 struct ata_host *host = dev_get_drvdata(dev);
7303 ata_host_detach(host);
7306 /* move to PCI subsystem */
7307 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
7309 unsigned long tmp = 0;
7311 switch (bits->width) {
7314 pci_read_config_byte(pdev, bits->reg, &tmp8);
7320 pci_read_config_word(pdev, bits->reg, &tmp16);
7326 pci_read_config_dword(pdev, bits->reg, &tmp32);
7337 return (tmp == bits->val) ? 1 : 0;
7341 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
7343 pci_save_state(pdev);
7344 pci_disable_device(pdev);
7346 if (mesg.event == PM_EVENT_SUSPEND)
7347 pci_set_power_state(pdev, PCI_D3hot);
7350 int ata_pci_device_do_resume(struct pci_dev *pdev)
7354 pci_set_power_state(pdev, PCI_D0);
7355 pci_restore_state(pdev);
7357 rc = pcim_enable_device(pdev);
7359 dev_printk(KERN_ERR, &pdev->dev,
7360 "failed to enable device after resume (%d)\n", rc);
7364 pci_set_master(pdev);
7368 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
7370 struct ata_host *host = dev_get_drvdata(&pdev->dev);
7373 rc = ata_host_suspend(host, mesg);
7377 ata_pci_device_do_suspend(pdev, mesg);
7382 int ata_pci_device_resume(struct pci_dev *pdev)
7384 struct ata_host *host = dev_get_drvdata(&pdev->dev);
7387 rc = ata_pci_device_do_resume(pdev);
7389 ata_host_resume(host);
7392 #endif /* CONFIG_PM */
7394 #endif /* CONFIG_PCI */
7397 static int __init ata_init(void)
7399 ata_probe_timeout *= HZ;
7400 ata_wq = create_workqueue("ata");
7404 ata_aux_wq = create_singlethread_workqueue("ata_aux");
7406 destroy_workqueue(ata_wq);
7410 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
7414 static void __exit ata_exit(void)
7416 destroy_workqueue(ata_wq);
7417 destroy_workqueue(ata_aux_wq);
7420 subsys_initcall(ata_init);
7421 module_exit(ata_exit);
7423 static unsigned long ratelimit_time;
7424 static DEFINE_SPINLOCK(ata_ratelimit_lock);
7426 int ata_ratelimit(void)
7429 unsigned long flags;
7431 spin_lock_irqsave(&ata_ratelimit_lock, flags);
7433 if (time_after(jiffies, ratelimit_time)) {
7435 ratelimit_time = jiffies + (HZ/5);
7439 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
7445 * ata_wait_register - wait until register value changes
7446 * @reg: IO-mapped register
7447 * @mask: Mask to apply to read register value
7448 * @val: Wait condition
7449 * @interval_msec: polling interval in milliseconds
7450 * @timeout_msec: timeout in milliseconds
7452 * Waiting for some bits of register to change is a common
7453 * operation for ATA controllers. This function reads 32bit LE
7454 * IO-mapped register @reg and tests for the following condition.
7456 * (*@reg & mask) != val
7458 * If the condition is met, it returns; otherwise, the process is
7459 * repeated after @interval_msec until timeout.
7462 * Kernel thread context (may sleep)
7465 * The final register value.
7467 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
7468 unsigned long interval_msec,
7469 unsigned long timeout_msec)
7471 unsigned long timeout;
7474 tmp = ioread32(reg);
7476 /* Calculate timeout _after_ the first read to make sure
7477 * preceding writes reach the controller before starting to
7478 * eat away the timeout.
7480 timeout = jiffies + (timeout_msec * HZ) / 1000;
7482 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
7483 msleep(interval_msec);
7484 tmp = ioread32(reg);
7493 static void ata_dummy_noret(struct ata_port *ap) { }
7494 static int ata_dummy_ret0(struct ata_port *ap) { return 0; }
7495 static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }
7497 static u8 ata_dummy_check_status(struct ata_port *ap)
7502 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
7504 return AC_ERR_SYSTEM;
7507 const struct ata_port_operations ata_dummy_port_ops = {
7508 .check_status = ata_dummy_check_status,
7509 .check_altstatus = ata_dummy_check_status,
7510 .dev_select = ata_noop_dev_select,
7511 .qc_prep = ata_noop_qc_prep,
7512 .qc_issue = ata_dummy_qc_issue,
7513 .freeze = ata_dummy_noret,
7514 .thaw = ata_dummy_noret,
7515 .error_handler = ata_dummy_noret,
7516 .post_internal_cmd = ata_dummy_qc_noret,
7517 .irq_clear = ata_dummy_noret,
7518 .port_start = ata_dummy_ret0,
7519 .port_stop = ata_dummy_noret,
7522 const struct ata_port_info ata_dummy_port_info = {
7523 .port_ops = &ata_dummy_port_ops,
7527 * libata is essentially a library of internal helper functions for
7528 * low-level ATA host controller drivers. As such, the API/ABI is
7529 * likely to change as new drivers are added and updated.
7530 * Do not depend on ABI/API stability.
7532 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
7533 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
7534 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
7535 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7536 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
7537 EXPORT_SYMBOL_GPL(ata_std_bios_param);
7538 EXPORT_SYMBOL_GPL(ata_std_ports);
7539 EXPORT_SYMBOL_GPL(ata_host_init);
7540 EXPORT_SYMBOL_GPL(ata_host_alloc);
7541 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7542 EXPORT_SYMBOL_GPL(ata_host_start);
7543 EXPORT_SYMBOL_GPL(ata_host_register);
7544 EXPORT_SYMBOL_GPL(ata_host_activate);
7545 EXPORT_SYMBOL_GPL(ata_host_detach);
7546 EXPORT_SYMBOL_GPL(ata_sg_init);
7547 EXPORT_SYMBOL_GPL(ata_sg_init_one);
7548 EXPORT_SYMBOL_GPL(ata_hsm_move);
7549 EXPORT_SYMBOL_GPL(ata_qc_complete);
7550 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
7551 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
7552 EXPORT_SYMBOL_GPL(ata_tf_load);
7553 EXPORT_SYMBOL_GPL(ata_tf_read);
7554 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
7555 EXPORT_SYMBOL_GPL(ata_std_dev_select);
7556 EXPORT_SYMBOL_GPL(sata_print_link_status);
7557 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
7558 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
7559 EXPORT_SYMBOL_GPL(ata_check_status);
7560 EXPORT_SYMBOL_GPL(ata_altstatus);
7561 EXPORT_SYMBOL_GPL(ata_exec_command);
7562 EXPORT_SYMBOL_GPL(ata_port_start);
7563 EXPORT_SYMBOL_GPL(ata_sff_port_start);
7564 EXPORT_SYMBOL_GPL(ata_interrupt);
7565 EXPORT_SYMBOL_GPL(ata_do_set_mode);
7566 EXPORT_SYMBOL_GPL(ata_data_xfer);
7567 EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
7568 EXPORT_SYMBOL_GPL(ata_std_qc_defer);
7569 EXPORT_SYMBOL_GPL(ata_qc_prep);
7570 EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
7571 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
7572 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
7573 EXPORT_SYMBOL_GPL(ata_bmdma_start);
7574 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
7575 EXPORT_SYMBOL_GPL(ata_bmdma_status);
7576 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
7577 EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
7578 EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
7579 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
7580 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
7581 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
7582 EXPORT_SYMBOL_GPL(ata_port_probe);
7583 EXPORT_SYMBOL_GPL(ata_dev_disable);
7584 EXPORT_SYMBOL_GPL(sata_set_spd);
7585 EXPORT_SYMBOL_GPL(sata_link_debounce);
7586 EXPORT_SYMBOL_GPL(sata_link_resume);
7587 EXPORT_SYMBOL_GPL(ata_bus_reset);
7588 EXPORT_SYMBOL_GPL(ata_std_prereset);
7589 EXPORT_SYMBOL_GPL(ata_std_softreset);
7590 EXPORT_SYMBOL_GPL(sata_link_hardreset);
7591 EXPORT_SYMBOL_GPL(sata_std_hardreset);
7592 EXPORT_SYMBOL_GPL(ata_std_postreset);
7593 EXPORT_SYMBOL_GPL(ata_dev_classify);
7594 EXPORT_SYMBOL_GPL(ata_dev_pair);
7595 EXPORT_SYMBOL_GPL(ata_port_disable);
7596 EXPORT_SYMBOL_GPL(ata_ratelimit);
7597 EXPORT_SYMBOL_GPL(ata_wait_register);
7598 EXPORT_SYMBOL_GPL(ata_busy_sleep);
7599 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
7600 EXPORT_SYMBOL_GPL(ata_wait_ready);
7601 EXPORT_SYMBOL_GPL(ata_port_queue_task);
7602 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
7603 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
7604 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7605 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7606 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
7607 EXPORT_SYMBOL_GPL(ata_host_intr);
7608 EXPORT_SYMBOL_GPL(sata_scr_valid);
7609 EXPORT_SYMBOL_GPL(sata_scr_read);
7610 EXPORT_SYMBOL_GPL(sata_scr_write);
7611 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
7612 EXPORT_SYMBOL_GPL(ata_link_online);
7613 EXPORT_SYMBOL_GPL(ata_link_offline);
7615 EXPORT_SYMBOL_GPL(ata_host_suspend);
7616 EXPORT_SYMBOL_GPL(ata_host_resume);
7617 #endif /* CONFIG_PM */
7618 EXPORT_SYMBOL_GPL(ata_id_string);
7619 EXPORT_SYMBOL_GPL(ata_id_c_string);
7620 EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
7621 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
7623 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
7624 EXPORT_SYMBOL_GPL(ata_timing_compute);
7625 EXPORT_SYMBOL_GPL(ata_timing_merge);
7628 EXPORT_SYMBOL_GPL(pci_test_config_bits);
7629 EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
7630 EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
7631 EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
7632 EXPORT_SYMBOL_GPL(ata_pci_init_one);
7633 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7635 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
7636 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
7637 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
7638 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7639 #endif /* CONFIG_PM */
7640 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
7641 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
7642 #endif /* CONFIG_PCI */
7644 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
7645 EXPORT_SYMBOL_GPL(sata_pmp_std_prereset);
7646 EXPORT_SYMBOL_GPL(sata_pmp_std_hardreset);
7647 EXPORT_SYMBOL_GPL(sata_pmp_std_postreset);
7648 EXPORT_SYMBOL_GPL(sata_pmp_do_eh);
7650 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
7651 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
7652 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7653 EXPORT_SYMBOL_GPL(ata_port_desc);
7655 EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
7656 #endif /* CONFIG_PCI */
7657 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7658 EXPORT_SYMBOL_GPL(ata_link_abort);
7659 EXPORT_SYMBOL_GPL(ata_port_abort);
7660 EXPORT_SYMBOL_GPL(ata_port_freeze);
7661 EXPORT_SYMBOL_GPL(sata_async_notification);
7662 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
7663 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7664 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
7665 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
7666 EXPORT_SYMBOL_GPL(ata_do_eh);
7667 EXPORT_SYMBOL_GPL(ata_irq_on);
7668 EXPORT_SYMBOL_GPL(ata_dev_try_classify);
7670 EXPORT_SYMBOL_GPL(ata_cable_40wire);
7671 EXPORT_SYMBOL_GPL(ata_cable_80wire);
7672 EXPORT_SYMBOL_GPL(ata_cable_unknown);
7673 EXPORT_SYMBOL_GPL(ata_cable_sata);