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/
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/pci.h>
38 #include <linux/init.h>
39 #include <linux/list.h>
41 #include <linux/highmem.h>
42 #include <linux/spinlock.h>
43 #include <linux/blkdev.h>
44 #include <linux/delay.h>
45 #include <linux/timer.h>
46 #include <linux/interrupt.h>
47 #include <linux/completion.h>
48 #include <linux/suspend.h>
49 #include <linux/workqueue.h>
50 #include <linux/jiffies.h>
51 #include <linux/scatterlist.h>
52 #include <scsi/scsi.h>
53 #include <scsi/scsi_cmnd.h>
54 #include <scsi/scsi_host.h>
55 #include <linux/libata.h>
57 #include <asm/semaphore.h>
58 #include <asm/byteorder.h>
62 #define DRV_VERSION "2.21" /* must be exactly four chars */
65 /* debounce timing parameters in msecs { interval, duration, timeout } */
66 const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
67 const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
68 const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
70 static unsigned int ata_dev_init_params(struct ata_device *dev,
71 u16 heads, u16 sectors);
72 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
73 static void ata_dev_xfermask(struct ata_device *dev);
74 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
76 unsigned int ata_print_id = 1;
77 static struct workqueue_struct *ata_wq;
79 struct workqueue_struct *ata_aux_wq;
81 int atapi_enabled = 1;
82 module_param(atapi_enabled, int, 0444);
83 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
86 module_param(atapi_dmadir, int, 0444);
87 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
90 module_param_named(fua, libata_fua, int, 0444);
91 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
93 static int ata_ignore_hpa = 0;
94 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
95 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
97 static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
98 module_param(ata_probe_timeout, int, 0444);
99 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
101 int libata_noacpi = 1;
102 module_param_named(noacpi, libata_noacpi, int, 0444);
103 MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in suspend/resume when set");
105 MODULE_AUTHOR("Jeff Garzik");
106 MODULE_DESCRIPTION("Library module for ATA devices");
107 MODULE_LICENSE("GPL");
108 MODULE_VERSION(DRV_VERSION);
112 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
113 * @tf: Taskfile to convert
114 * @fis: Buffer into which data will output
115 * @pmp: Port multiplier port
117 * Converts a standard ATA taskfile to a Serial ATA
118 * FIS structure (Register - Host to Device).
121 * Inherited from caller.
124 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
126 fis[0] = 0x27; /* Register - Host to Device FIS */
127 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
128 bit 7 indicates Command FIS */
129 fis[2] = tf->command;
130 fis[3] = tf->feature;
137 fis[8] = tf->hob_lbal;
138 fis[9] = tf->hob_lbam;
139 fis[10] = tf->hob_lbah;
140 fis[11] = tf->hob_feature;
143 fis[13] = tf->hob_nsect;
154 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
155 * @fis: Buffer from which data will be input
156 * @tf: Taskfile to output
158 * Converts a serial ATA FIS structure to a standard ATA taskfile.
161 * Inherited from caller.
164 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
166 tf->command = fis[2]; /* status */
167 tf->feature = fis[3]; /* error */
174 tf->hob_lbal = fis[8];
175 tf->hob_lbam = fis[9];
176 tf->hob_lbah = fis[10];
179 tf->hob_nsect = fis[13];
182 static const u8 ata_rw_cmds[] = {
186 ATA_CMD_READ_MULTI_EXT,
187 ATA_CMD_WRITE_MULTI_EXT,
191 ATA_CMD_WRITE_MULTI_FUA_EXT,
195 ATA_CMD_PIO_READ_EXT,
196 ATA_CMD_PIO_WRITE_EXT,
209 ATA_CMD_WRITE_FUA_EXT
213 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
214 * @tf: command to examine and configure
215 * @dev: device tf belongs to
217 * Examine the device configuration and tf->flags to calculate
218 * the proper read/write commands and protocol to use.
223 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
227 int index, fua, lba48, write;
229 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
230 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
231 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
233 if (dev->flags & ATA_DFLAG_PIO) {
234 tf->protocol = ATA_PROT_PIO;
235 index = dev->multi_count ? 0 : 8;
236 } else if (lba48 && (dev->ap->flags & ATA_FLAG_PIO_LBA48)) {
237 /* Unable to use DMA due to host limitation */
238 tf->protocol = ATA_PROT_PIO;
239 index = dev->multi_count ? 0 : 8;
241 tf->protocol = ATA_PROT_DMA;
245 cmd = ata_rw_cmds[index + fua + lba48 + write];
254 * ata_tf_read_block - Read block address from ATA taskfile
255 * @tf: ATA taskfile of interest
256 * @dev: ATA device @tf belongs to
261 * Read block address from @tf. This function can handle all
262 * three address formats - LBA, LBA48 and CHS. tf->protocol and
263 * flags select the address format to use.
266 * Block address read from @tf.
268 u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
272 if (tf->flags & ATA_TFLAG_LBA) {
273 if (tf->flags & ATA_TFLAG_LBA48) {
274 block |= (u64)tf->hob_lbah << 40;
275 block |= (u64)tf->hob_lbam << 32;
276 block |= tf->hob_lbal << 24;
278 block |= (tf->device & 0xf) << 24;
280 block |= tf->lbah << 16;
281 block |= tf->lbam << 8;
286 cyl = tf->lbam | (tf->lbah << 8);
287 head = tf->device & 0xf;
290 block = (cyl * dev->heads + head) * dev->sectors + sect;
297 * ata_build_rw_tf - Build ATA taskfile for given read/write request
298 * @tf: Target ATA taskfile
299 * @dev: ATA device @tf belongs to
300 * @block: Block address
301 * @n_block: Number of blocks
302 * @tf_flags: RW/FUA etc...
308 * Build ATA taskfile @tf for read/write request described by
309 * @block, @n_block, @tf_flags and @tag on @dev.
313 * 0 on success, -ERANGE if the request is too large for @dev,
314 * -EINVAL if the request is invalid.
316 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
317 u64 block, u32 n_block, unsigned int tf_flags,
320 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
321 tf->flags |= tf_flags;
323 if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
325 if (!lba_48_ok(block, n_block))
328 tf->protocol = ATA_PROT_NCQ;
329 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
331 if (tf->flags & ATA_TFLAG_WRITE)
332 tf->command = ATA_CMD_FPDMA_WRITE;
334 tf->command = ATA_CMD_FPDMA_READ;
336 tf->nsect = tag << 3;
337 tf->hob_feature = (n_block >> 8) & 0xff;
338 tf->feature = n_block & 0xff;
340 tf->hob_lbah = (block >> 40) & 0xff;
341 tf->hob_lbam = (block >> 32) & 0xff;
342 tf->hob_lbal = (block >> 24) & 0xff;
343 tf->lbah = (block >> 16) & 0xff;
344 tf->lbam = (block >> 8) & 0xff;
345 tf->lbal = block & 0xff;
348 if (tf->flags & ATA_TFLAG_FUA)
349 tf->device |= 1 << 7;
350 } else if (dev->flags & ATA_DFLAG_LBA) {
351 tf->flags |= ATA_TFLAG_LBA;
353 if (lba_28_ok(block, n_block)) {
355 tf->device |= (block >> 24) & 0xf;
356 } else if (lba_48_ok(block, n_block)) {
357 if (!(dev->flags & ATA_DFLAG_LBA48))
361 tf->flags |= ATA_TFLAG_LBA48;
363 tf->hob_nsect = (n_block >> 8) & 0xff;
365 tf->hob_lbah = (block >> 40) & 0xff;
366 tf->hob_lbam = (block >> 32) & 0xff;
367 tf->hob_lbal = (block >> 24) & 0xff;
369 /* request too large even for LBA48 */
372 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
375 tf->nsect = n_block & 0xff;
377 tf->lbah = (block >> 16) & 0xff;
378 tf->lbam = (block >> 8) & 0xff;
379 tf->lbal = block & 0xff;
381 tf->device |= ATA_LBA;
384 u32 sect, head, cyl, track;
386 /* The request -may- be too large for CHS addressing. */
387 if (!lba_28_ok(block, n_block))
390 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
393 /* Convert LBA to CHS */
394 track = (u32)block / dev->sectors;
395 cyl = track / dev->heads;
396 head = track % dev->heads;
397 sect = (u32)block % dev->sectors + 1;
399 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
400 (u32)block, track, cyl, head, sect);
402 /* Check whether the converted CHS can fit.
406 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
409 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
420 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
421 * @pio_mask: pio_mask
422 * @mwdma_mask: mwdma_mask
423 * @udma_mask: udma_mask
425 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
426 * unsigned int xfer_mask.
434 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
435 unsigned int mwdma_mask,
436 unsigned int udma_mask)
438 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
439 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
440 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
444 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
445 * @xfer_mask: xfer_mask to unpack
446 * @pio_mask: resulting pio_mask
447 * @mwdma_mask: resulting mwdma_mask
448 * @udma_mask: resulting udma_mask
450 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
451 * Any NULL distination masks will be ignored.
453 static void ata_unpack_xfermask(unsigned int xfer_mask,
454 unsigned int *pio_mask,
455 unsigned int *mwdma_mask,
456 unsigned int *udma_mask)
459 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
461 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
463 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
466 static const struct ata_xfer_ent {
470 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
471 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
472 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
477 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
478 * @xfer_mask: xfer_mask of interest
480 * Return matching XFER_* value for @xfer_mask. Only the highest
481 * bit of @xfer_mask is considered.
487 * Matching XFER_* value, 0 if no match found.
489 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
491 int highbit = fls(xfer_mask) - 1;
492 const struct ata_xfer_ent *ent;
494 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
495 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
496 return ent->base + highbit - ent->shift;
501 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
502 * @xfer_mode: XFER_* of interest
504 * Return matching xfer_mask for @xfer_mode.
510 * Matching xfer_mask, 0 if no match found.
512 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
514 const struct ata_xfer_ent *ent;
516 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
517 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
518 return 1 << (ent->shift + xfer_mode - ent->base);
523 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
524 * @xfer_mode: XFER_* of interest
526 * Return matching xfer_shift for @xfer_mode.
532 * Matching xfer_shift, -1 if no match found.
534 static int ata_xfer_mode2shift(unsigned int xfer_mode)
536 const struct ata_xfer_ent *ent;
538 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
539 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
545 * ata_mode_string - convert xfer_mask to string
546 * @xfer_mask: mask of bits supported; only highest bit counts.
548 * Determine string which represents the highest speed
549 * (highest bit in @modemask).
555 * Constant C string representing highest speed listed in
556 * @mode_mask, or the constant C string "<n/a>".
558 static const char *ata_mode_string(unsigned int xfer_mask)
560 static const char * const xfer_mode_str[] = {
584 highbit = fls(xfer_mask) - 1;
585 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
586 return xfer_mode_str[highbit];
590 static const char *sata_spd_string(unsigned int spd)
592 static const char * const spd_str[] = {
597 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
599 return spd_str[spd - 1];
602 void ata_dev_disable(struct ata_device *dev)
604 if (ata_dev_enabled(dev)) {
605 if (ata_msg_drv(dev->ap))
606 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
607 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
614 * ata_devchk - PATA device presence detection
615 * @ap: ATA channel to examine
616 * @device: Device to examine (starting at zero)
618 * This technique was originally described in
619 * Hale Landis's ATADRVR (www.ata-atapi.com), and
620 * later found its way into the ATA/ATAPI spec.
622 * Write a pattern to the ATA shadow registers,
623 * and if a device is present, it will respond by
624 * correctly storing and echoing back the
625 * ATA shadow register contents.
631 static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
633 struct ata_ioports *ioaddr = &ap->ioaddr;
636 ap->ops->dev_select(ap, device);
638 iowrite8(0x55, ioaddr->nsect_addr);
639 iowrite8(0xaa, ioaddr->lbal_addr);
641 iowrite8(0xaa, ioaddr->nsect_addr);
642 iowrite8(0x55, ioaddr->lbal_addr);
644 iowrite8(0x55, ioaddr->nsect_addr);
645 iowrite8(0xaa, ioaddr->lbal_addr);
647 nsect = ioread8(ioaddr->nsect_addr);
648 lbal = ioread8(ioaddr->lbal_addr);
650 if ((nsect == 0x55) && (lbal == 0xaa))
651 return 1; /* we found a device */
653 return 0; /* nothing found */
657 * ata_dev_classify - determine device type based on ATA-spec signature
658 * @tf: ATA taskfile register set for device to be identified
660 * Determine from taskfile register contents whether a device is
661 * ATA or ATAPI, as per "Signature and persistence" section
662 * of ATA/PI spec (volume 1, sect 5.14).
668 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
669 * the event of failure.
672 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
674 /* Apple's open source Darwin code hints that some devices only
675 * put a proper signature into the LBA mid/high registers,
676 * So, we only check those. It's sufficient for uniqueness.
679 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
680 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
681 DPRINTK("found ATA device by sig\n");
685 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
686 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
687 DPRINTK("found ATAPI device by sig\n");
688 return ATA_DEV_ATAPI;
691 DPRINTK("unknown device\n");
692 return ATA_DEV_UNKNOWN;
696 * ata_dev_try_classify - Parse returned ATA device signature
697 * @ap: ATA channel to examine
698 * @device: Device to examine (starting at zero)
699 * @r_err: Value of error register on completion
701 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
702 * an ATA/ATAPI-defined set of values is placed in the ATA
703 * shadow registers, indicating the results of device detection
706 * Select the ATA device, and read the values from the ATA shadow
707 * registers. Then parse according to the Error register value,
708 * and the spec-defined values examined by ata_dev_classify().
714 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
718 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
720 struct ata_taskfile tf;
724 ap->ops->dev_select(ap, device);
726 memset(&tf, 0, sizeof(tf));
728 ap->ops->tf_read(ap, &tf);
733 /* see if device passed diags: if master then continue and warn later */
734 if (err == 0 && device == 0)
735 /* diagnostic fail : do nothing _YET_ */
736 ap->device[device].horkage |= ATA_HORKAGE_DIAGNOSTIC;
739 else if ((device == 0) && (err == 0x81))
744 /* determine if device is ATA or ATAPI */
745 class = ata_dev_classify(&tf);
747 if (class == ATA_DEV_UNKNOWN)
749 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
755 * ata_id_string - Convert IDENTIFY DEVICE page into string
756 * @id: IDENTIFY DEVICE results we will examine
757 * @s: string into which data is output
758 * @ofs: offset into identify device page
759 * @len: length of string to return. must be an even number.
761 * The strings in the IDENTIFY DEVICE page are broken up into
762 * 16-bit chunks. Run through the string, and output each
763 * 8-bit chunk linearly, regardless of platform.
769 void ata_id_string(const u16 *id, unsigned char *s,
770 unsigned int ofs, unsigned int len)
789 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
790 * @id: IDENTIFY DEVICE results we will examine
791 * @s: string into which data is output
792 * @ofs: offset into identify device page
793 * @len: length of string to return. must be an odd number.
795 * This function is identical to ata_id_string except that it
796 * trims trailing spaces and terminates the resulting string with
797 * null. @len must be actual maximum length (even number) + 1.
802 void ata_id_c_string(const u16 *id, unsigned char *s,
803 unsigned int ofs, unsigned int len)
809 ata_id_string(id, s, ofs, len - 1);
811 p = s + strnlen(s, len - 1);
812 while (p > s && p[-1] == ' ')
817 static u64 ata_tf_to_lba48(struct ata_taskfile *tf)
821 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
822 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
823 sectors |= (tf->hob_lbal & 0xff) << 24;
824 sectors |= (tf->lbah & 0xff) << 16;
825 sectors |= (tf->lbam & 0xff) << 8;
826 sectors |= (tf->lbal & 0xff);
831 static u64 ata_tf_to_lba(struct ata_taskfile *tf)
835 sectors |= (tf->device & 0x0f) << 24;
836 sectors |= (tf->lbah & 0xff) << 16;
837 sectors |= (tf->lbam & 0xff) << 8;
838 sectors |= (tf->lbal & 0xff);
844 * ata_read_native_max_address_ext - LBA48 native max query
845 * @dev: Device to query
847 * Perform an LBA48 size query upon the device in question. Return the
848 * actual LBA48 size or zero if the command fails.
851 static u64 ata_read_native_max_address_ext(struct ata_device *dev)
854 struct ata_taskfile tf;
856 ata_tf_init(dev, &tf);
858 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
859 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | ATA_TFLAG_ISADDR;
860 tf.protocol |= ATA_PROT_NODATA;
863 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
867 return ata_tf_to_lba48(&tf);
871 * ata_read_native_max_address - LBA28 native max query
872 * @dev: Device to query
874 * Performa an LBA28 size query upon the device in question. Return the
875 * actual LBA28 size or zero if the command fails.
878 static u64 ata_read_native_max_address(struct ata_device *dev)
881 struct ata_taskfile tf;
883 ata_tf_init(dev, &tf);
885 tf.command = ATA_CMD_READ_NATIVE_MAX;
886 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
887 tf.protocol |= ATA_PROT_NODATA;
890 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
894 return ata_tf_to_lba(&tf);
898 * ata_set_native_max_address_ext - LBA48 native max set
899 * @dev: Device to query
900 * @new_sectors: new max sectors value to set for the device
902 * Perform an LBA48 size set max upon the device in question. Return the
903 * actual LBA48 size or zero if the command fails.
906 static u64 ata_set_native_max_address_ext(struct ata_device *dev, u64 new_sectors)
909 struct ata_taskfile tf;
913 ata_tf_init(dev, &tf);
915 tf.command = ATA_CMD_SET_MAX_EXT;
916 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | ATA_TFLAG_ISADDR;
917 tf.protocol |= ATA_PROT_NODATA;
920 tf.lbal = (new_sectors >> 0) & 0xff;
921 tf.lbam = (new_sectors >> 8) & 0xff;
922 tf.lbah = (new_sectors >> 16) & 0xff;
924 tf.hob_lbal = (new_sectors >> 24) & 0xff;
925 tf.hob_lbam = (new_sectors >> 32) & 0xff;
926 tf.hob_lbah = (new_sectors >> 40) & 0xff;
928 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
932 return ata_tf_to_lba48(&tf);
936 * ata_set_native_max_address - LBA28 native max set
937 * @dev: Device to query
938 * @new_sectors: new max sectors value to set for the device
940 * Perform an LBA28 size set max upon the device in question. Return the
941 * actual LBA28 size or zero if the command fails.
944 static u64 ata_set_native_max_address(struct ata_device *dev, u64 new_sectors)
947 struct ata_taskfile tf;
951 ata_tf_init(dev, &tf);
953 tf.command = ATA_CMD_SET_MAX;
954 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
955 tf.protocol |= ATA_PROT_NODATA;
957 tf.lbal = (new_sectors >> 0) & 0xff;
958 tf.lbam = (new_sectors >> 8) & 0xff;
959 tf.lbah = (new_sectors >> 16) & 0xff;
960 tf.device |= ((new_sectors >> 24) & 0x0f) | 0x40;
962 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
966 return ata_tf_to_lba(&tf);
970 * ata_hpa_resize - Resize a device with an HPA set
971 * @dev: Device to resize
973 * Read the size of an LBA28 or LBA48 disk with HPA features and resize
974 * it if required to the full size of the media. The caller must check
975 * the drive has the HPA feature set enabled.
978 static u64 ata_hpa_resize(struct ata_device *dev)
980 u64 sectors = dev->n_sectors;
983 if (ata_id_has_lba48(dev->id))
984 hpa_sectors = ata_read_native_max_address_ext(dev);
986 hpa_sectors = ata_read_native_max_address(dev);
988 if (hpa_sectors > sectors) {
989 ata_dev_printk(dev, KERN_INFO,
990 "Host Protected Area detected:\n"
991 "\tcurrent size: %lld sectors\n"
992 "\tnative size: %lld sectors\n",
993 (long long)sectors, (long long)hpa_sectors);
995 if (ata_ignore_hpa) {
996 if (ata_id_has_lba48(dev->id))
997 hpa_sectors = ata_set_native_max_address_ext(dev, hpa_sectors);
999 hpa_sectors = ata_set_native_max_address(dev,
1003 ata_dev_printk(dev, KERN_INFO, "native size "
1004 "increased to %lld sectors\n",
1005 (long long)hpa_sectors);
1009 } else if (hpa_sectors < sectors)
1010 ata_dev_printk(dev, KERN_WARNING, "%s 1: hpa sectors (%lld) "
1011 "is smaller than sectors (%lld)\n", __FUNCTION__,
1012 (long long)hpa_sectors, (long long)sectors);
1017 static u64 ata_id_n_sectors(const u16 *id)
1019 if (ata_id_has_lba(id)) {
1020 if (ata_id_has_lba48(id))
1021 return ata_id_u64(id, 100);
1023 return ata_id_u32(id, 60);
1025 if (ata_id_current_chs_valid(id))
1026 return ata_id_u32(id, 57);
1028 return id[1] * id[3] * id[6];
1033 * ata_id_to_dma_mode - Identify DMA mode from id block
1034 * @dev: device to identify
1035 * @unknown: mode to assume if we cannot tell
1037 * Set up the timing values for the device based upon the identify
1038 * reported values for the DMA mode. This function is used by drivers
1039 * which rely upon firmware configured modes, but wish to report the
1040 * mode correctly when possible.
1042 * In addition we emit similarly formatted messages to the default
1043 * ata_dev_set_mode handler, in order to provide consistency of
1047 void ata_id_to_dma_mode(struct ata_device *dev, u8 unknown)
1052 /* Pack the DMA modes */
1053 mask = ((dev->id[63] >> 8) << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA;
1054 if (dev->id[53] & 0x04)
1055 mask |= ((dev->id[88] >> 8) << ATA_SHIFT_UDMA) & ATA_MASK_UDMA;
1057 /* Select the mode in use */
1058 mode = ata_xfer_mask2mode(mask);
1061 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
1062 ata_mode_string(mask));
1064 /* SWDMA perhaps ? */
1066 ata_dev_printk(dev, KERN_INFO, "configured for DMA\n");
1069 /* Configure the device reporting */
1070 dev->xfer_mode = mode;
1071 dev->xfer_shift = ata_xfer_mode2shift(mode);
1075 * ata_noop_dev_select - Select device 0/1 on ATA bus
1076 * @ap: ATA channel to manipulate
1077 * @device: ATA device (numbered from zero) to select
1079 * This function performs no actual function.
1081 * May be used as the dev_select() entry in ata_port_operations.
1086 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
1092 * ata_std_dev_select - Select device 0/1 on ATA bus
1093 * @ap: ATA channel to manipulate
1094 * @device: ATA device (numbered from zero) to select
1096 * Use the method defined in the ATA specification to
1097 * make either device 0, or device 1, active on the
1098 * ATA channel. Works with both PIO and MMIO.
1100 * May be used as the dev_select() entry in ata_port_operations.
1106 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
1111 tmp = ATA_DEVICE_OBS;
1113 tmp = ATA_DEVICE_OBS | ATA_DEV1;
1115 iowrite8(tmp, ap->ioaddr.device_addr);
1116 ata_pause(ap); /* needed; also flushes, for mmio */
1120 * ata_dev_select - Select device 0/1 on ATA bus
1121 * @ap: ATA channel to manipulate
1122 * @device: ATA device (numbered from zero) to select
1123 * @wait: non-zero to wait for Status register BSY bit to clear
1124 * @can_sleep: non-zero if context allows sleeping
1126 * Use the method defined in the ATA specification to
1127 * make either device 0, or device 1, active on the
1130 * This is a high-level version of ata_std_dev_select(),
1131 * which additionally provides the services of inserting
1132 * the proper pauses and status polling, where needed.
1138 void ata_dev_select(struct ata_port *ap, unsigned int device,
1139 unsigned int wait, unsigned int can_sleep)
1141 if (ata_msg_probe(ap))
1142 ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
1143 "device %u, wait %u\n", device, wait);
1148 ap->ops->dev_select(ap, device);
1151 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
1158 * ata_dump_id - IDENTIFY DEVICE info debugging output
1159 * @id: IDENTIFY DEVICE page to dump
1161 * Dump selected 16-bit words from the given IDENTIFY DEVICE
1168 static inline void ata_dump_id(const u16 *id)
1170 DPRINTK("49==0x%04x "
1180 DPRINTK("80==0x%04x "
1190 DPRINTK("88==0x%04x "
1197 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1198 * @id: IDENTIFY data to compute xfer mask from
1200 * Compute the xfermask for this device. This is not as trivial
1201 * as it seems if we must consider early devices correctly.
1203 * FIXME: pre IDE drive timing (do we care ?).
1211 static unsigned int ata_id_xfermask(const u16 *id)
1213 unsigned int pio_mask, mwdma_mask, udma_mask;
1215 /* Usual case. Word 53 indicates word 64 is valid */
1216 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1217 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1221 /* If word 64 isn't valid then Word 51 high byte holds
1222 * the PIO timing number for the maximum. Turn it into
1225 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1226 if (mode < 5) /* Valid PIO range */
1227 pio_mask = (2 << mode) - 1;
1231 /* But wait.. there's more. Design your standards by
1232 * committee and you too can get a free iordy field to
1233 * process. However its the speeds not the modes that
1234 * are supported... Note drivers using the timing API
1235 * will get this right anyway
1239 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1241 if (ata_id_is_cfa(id)) {
1243 * Process compact flash extended modes
1245 int pio = id[163] & 0x7;
1246 int dma = (id[163] >> 3) & 7;
1249 pio_mask |= (1 << 5);
1251 pio_mask |= (1 << 6);
1253 mwdma_mask |= (1 << 3);
1255 mwdma_mask |= (1 << 4);
1259 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1260 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1262 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1266 * ata_port_queue_task - Queue port_task
1267 * @ap: The ata_port to queue port_task for
1268 * @fn: workqueue function to be scheduled
1269 * @data: data for @fn to use
1270 * @delay: delay time for workqueue function
1272 * Schedule @fn(@data) for execution after @delay jiffies using
1273 * port_task. There is one port_task per port and it's the
1274 * user(low level driver)'s responsibility to make sure that only
1275 * one task is active at any given time.
1277 * libata core layer takes care of synchronization between
1278 * port_task and EH. ata_port_queue_task() may be ignored for EH
1282 * Inherited from caller.
1284 void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
1285 unsigned long delay)
1287 PREPARE_DELAYED_WORK(&ap->port_task, fn);
1288 ap->port_task_data = data;
1290 /* may fail if ata_port_flush_task() in progress */
1291 queue_delayed_work(ata_wq, &ap->port_task, delay);
1295 * ata_port_flush_task - Flush port_task
1296 * @ap: The ata_port to flush port_task for
1298 * After this function completes, port_task is guranteed not to
1299 * be running or scheduled.
1302 * Kernel thread context (may sleep)
1304 void ata_port_flush_task(struct ata_port *ap)
1308 cancel_rearming_delayed_work(&ap->port_task);
1310 if (ata_msg_ctl(ap))
1311 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
1314 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1316 struct completion *waiting = qc->private_data;
1322 * ata_exec_internal_sg - execute libata internal command
1323 * @dev: Device to which the command is sent
1324 * @tf: Taskfile registers for the command and the result
1325 * @cdb: CDB for packet command
1326 * @dma_dir: Data tranfer direction of the command
1327 * @sg: sg list for the data buffer of the command
1328 * @n_elem: Number of sg entries
1330 * Executes libata internal command with timeout. @tf contains
1331 * command on entry and result on return. Timeout and error
1332 * conditions are reported via return value. No recovery action
1333 * is taken after a command times out. It's caller's duty to
1334 * clean up after timeout.
1337 * None. Should be called with kernel context, might sleep.
1340 * Zero on success, AC_ERR_* mask on failure
1342 unsigned ata_exec_internal_sg(struct ata_device *dev,
1343 struct ata_taskfile *tf, const u8 *cdb,
1344 int dma_dir, struct scatterlist *sg,
1345 unsigned int n_elem)
1347 struct ata_port *ap = dev->ap;
1348 u8 command = tf->command;
1349 struct ata_queued_cmd *qc;
1350 unsigned int tag, preempted_tag;
1351 u32 preempted_sactive, preempted_qc_active;
1352 DECLARE_COMPLETION_ONSTACK(wait);
1353 unsigned long flags;
1354 unsigned int err_mask;
1357 spin_lock_irqsave(ap->lock, flags);
1359 /* no internal command while frozen */
1360 if (ap->pflags & ATA_PFLAG_FROZEN) {
1361 spin_unlock_irqrestore(ap->lock, flags);
1362 return AC_ERR_SYSTEM;
1365 /* initialize internal qc */
1367 /* XXX: Tag 0 is used for drivers with legacy EH as some
1368 * drivers choke if any other tag is given. This breaks
1369 * ata_tag_internal() test for those drivers. Don't use new
1370 * EH stuff without converting to it.
1372 if (ap->ops->error_handler)
1373 tag = ATA_TAG_INTERNAL;
1377 if (test_and_set_bit(tag, &ap->qc_allocated))
1379 qc = __ata_qc_from_tag(ap, tag);
1387 preempted_tag = ap->active_tag;
1388 preempted_sactive = ap->sactive;
1389 preempted_qc_active = ap->qc_active;
1390 ap->active_tag = ATA_TAG_POISON;
1394 /* prepare & issue qc */
1397 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1398 qc->flags |= ATA_QCFLAG_RESULT_TF;
1399 qc->dma_dir = dma_dir;
1400 if (dma_dir != DMA_NONE) {
1401 unsigned int i, buflen = 0;
1403 for (i = 0; i < n_elem; i++)
1404 buflen += sg[i].length;
1406 ata_sg_init(qc, sg, n_elem);
1407 qc->nbytes = buflen;
1410 qc->private_data = &wait;
1411 qc->complete_fn = ata_qc_complete_internal;
1415 spin_unlock_irqrestore(ap->lock, flags);
1417 rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1419 ata_port_flush_task(ap);
1422 spin_lock_irqsave(ap->lock, flags);
1424 /* We're racing with irq here. If we lose, the
1425 * following test prevents us from completing the qc
1426 * twice. If we win, the port is frozen and will be
1427 * cleaned up by ->post_internal_cmd().
1429 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1430 qc->err_mask |= AC_ERR_TIMEOUT;
1432 if (ap->ops->error_handler)
1433 ata_port_freeze(ap);
1435 ata_qc_complete(qc);
1437 if (ata_msg_warn(ap))
1438 ata_dev_printk(dev, KERN_WARNING,
1439 "qc timeout (cmd 0x%x)\n", command);
1442 spin_unlock_irqrestore(ap->lock, flags);
1445 /* do post_internal_cmd */
1446 if (ap->ops->post_internal_cmd)
1447 ap->ops->post_internal_cmd(qc);
1449 /* perform minimal error analysis */
1450 if (qc->flags & ATA_QCFLAG_FAILED) {
1451 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1452 qc->err_mask |= AC_ERR_DEV;
1455 qc->err_mask |= AC_ERR_OTHER;
1457 if (qc->err_mask & ~AC_ERR_OTHER)
1458 qc->err_mask &= ~AC_ERR_OTHER;
1462 spin_lock_irqsave(ap->lock, flags);
1464 *tf = qc->result_tf;
1465 err_mask = qc->err_mask;
1468 ap->active_tag = preempted_tag;
1469 ap->sactive = preempted_sactive;
1470 ap->qc_active = preempted_qc_active;
1472 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1473 * Until those drivers are fixed, we detect the condition
1474 * here, fail the command with AC_ERR_SYSTEM and reenable the
1477 * Note that this doesn't change any behavior as internal
1478 * command failure results in disabling the device in the
1479 * higher layer for LLDDs without new reset/EH callbacks.
1481 * Kill the following code as soon as those drivers are fixed.
1483 if (ap->flags & ATA_FLAG_DISABLED) {
1484 err_mask |= AC_ERR_SYSTEM;
1488 spin_unlock_irqrestore(ap->lock, flags);
1494 * ata_exec_internal - execute libata internal command
1495 * @dev: Device to which the command is sent
1496 * @tf: Taskfile registers for the command and the result
1497 * @cdb: CDB for packet command
1498 * @dma_dir: Data tranfer direction of the command
1499 * @buf: Data buffer of the command
1500 * @buflen: Length of data buffer
1502 * Wrapper around ata_exec_internal_sg() which takes simple
1503 * buffer instead of sg list.
1506 * None. Should be called with kernel context, might sleep.
1509 * Zero on success, AC_ERR_* mask on failure
1511 unsigned ata_exec_internal(struct ata_device *dev,
1512 struct ata_taskfile *tf, const u8 *cdb,
1513 int dma_dir, void *buf, unsigned int buflen)
1515 struct scatterlist *psg = NULL, sg;
1516 unsigned int n_elem = 0;
1518 if (dma_dir != DMA_NONE) {
1520 sg_init_one(&sg, buf, buflen);
1525 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1529 * ata_do_simple_cmd - execute simple internal command
1530 * @dev: Device to which the command is sent
1531 * @cmd: Opcode to execute
1533 * Execute a 'simple' command, that only consists of the opcode
1534 * 'cmd' itself, without filling any other registers
1537 * Kernel thread context (may sleep).
1540 * Zero on success, AC_ERR_* mask on failure
1542 unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1544 struct ata_taskfile tf;
1546 ata_tf_init(dev, &tf);
1549 tf.flags |= ATA_TFLAG_DEVICE;
1550 tf.protocol = ATA_PROT_NODATA;
1552 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1556 * ata_pio_need_iordy - check if iordy needed
1559 * Check if the current speed of the device requires IORDY. Used
1560 * by various controllers for chip configuration.
1563 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1565 /* Controller doesn't support IORDY. Probably a pointless check
1566 as the caller should know this */
1567 if (adev->ap->flags & ATA_FLAG_NO_IORDY)
1569 /* PIO3 and higher it is mandatory */
1570 if (adev->pio_mode > XFER_PIO_2)
1572 /* We turn it on when possible */
1573 if (ata_id_has_iordy(adev->id))
1579 * ata_pio_mask_no_iordy - Return the non IORDY mask
1582 * Compute the highest mode possible if we are not using iordy. Return
1583 * -1 if no iordy mode is available.
1586 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1588 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1589 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1590 u16 pio = adev->id[ATA_ID_EIDE_PIO];
1591 /* Is the speed faster than the drive allows non IORDY ? */
1593 /* This is cycle times not frequency - watch the logic! */
1594 if (pio > 240) /* PIO2 is 240nS per cycle */
1595 return 3 << ATA_SHIFT_PIO;
1596 return 7 << ATA_SHIFT_PIO;
1599 return 3 << ATA_SHIFT_PIO;
1603 * ata_dev_read_id - Read ID data from the specified device
1604 * @dev: target device
1605 * @p_class: pointer to class of the target device (may be changed)
1606 * @flags: ATA_READID_* flags
1607 * @id: buffer to read IDENTIFY data into
1609 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1610 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1611 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1612 * for pre-ATA4 drives.
1615 * Kernel thread context (may sleep)
1618 * 0 on success, -errno otherwise.
1620 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1621 unsigned int flags, u16 *id)
1623 struct ata_port *ap = dev->ap;
1624 unsigned int class = *p_class;
1625 struct ata_taskfile tf;
1626 unsigned int err_mask = 0;
1628 int may_fallback = 1, tried_spinup = 0;
1631 if (ata_msg_ctl(ap))
1632 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
1634 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1636 ata_tf_init(dev, &tf);
1640 tf.command = ATA_CMD_ID_ATA;
1643 tf.command = ATA_CMD_ID_ATAPI;
1647 reason = "unsupported class";
1651 tf.protocol = ATA_PROT_PIO;
1653 /* Some devices choke if TF registers contain garbage. Make
1654 * sure those are properly initialized.
1656 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1658 /* Device presence detection is unreliable on some
1659 * controllers. Always poll IDENTIFY if available.
1661 tf.flags |= ATA_TFLAG_POLLING;
1663 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1664 id, sizeof(id[0]) * ATA_ID_WORDS);
1666 if (err_mask & AC_ERR_NODEV_HINT) {
1667 DPRINTK("ata%u.%d: NODEV after polling detection\n",
1668 ap->print_id, dev->devno);
1672 /* Device or controller might have reported the wrong
1673 * device class. Give a shot at the other IDENTIFY if
1674 * the current one is aborted by the device.
1677 (err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
1680 if (class == ATA_DEV_ATA)
1681 class = ATA_DEV_ATAPI;
1683 class = ATA_DEV_ATA;
1688 reason = "I/O error";
1692 /* Falling back doesn't make sense if ID data was read
1693 * successfully at least once.
1697 swap_buf_le16(id, ATA_ID_WORDS);
1701 reason = "device reports invalid type";
1703 if (class == ATA_DEV_ATA) {
1704 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1707 if (ata_id_is_ata(id))
1711 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
1714 * Drive powered-up in standby mode, and requires a specific
1715 * SET_FEATURES spin-up subcommand before it will accept
1716 * anything other than the original IDENTIFY command.
1718 ata_tf_init(dev, &tf);
1719 tf.command = ATA_CMD_SET_FEATURES;
1720 tf.feature = SETFEATURES_SPINUP;
1721 tf.protocol = ATA_PROT_NODATA;
1722 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1723 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1726 reason = "SPINUP failed";
1730 * If the drive initially returned incomplete IDENTIFY info,
1731 * we now must reissue the IDENTIFY command.
1733 if (id[2] == 0x37c8)
1737 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1739 * The exact sequence expected by certain pre-ATA4 drives is:
1742 * INITIALIZE DEVICE PARAMETERS
1744 * Some drives were very specific about that exact sequence.
1746 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1747 err_mask = ata_dev_init_params(dev, id[3], id[6]);
1750 reason = "INIT_DEV_PARAMS failed";
1754 /* current CHS translation info (id[53-58]) might be
1755 * changed. reread the identify device info.
1757 flags &= ~ATA_READID_POSTRESET;
1767 if (ata_msg_warn(ap))
1768 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
1769 "(%s, err_mask=0x%x)\n", reason, err_mask);
1773 static inline u8 ata_dev_knobble(struct ata_device *dev)
1775 return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1778 static void ata_dev_config_ncq(struct ata_device *dev,
1779 char *desc, size_t desc_sz)
1781 struct ata_port *ap = dev->ap;
1782 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
1784 if (!ata_id_has_ncq(dev->id)) {
1788 if (dev->horkage & ATA_HORKAGE_NONCQ) {
1789 snprintf(desc, desc_sz, "NCQ (not used)");
1792 if (ap->flags & ATA_FLAG_NCQ) {
1793 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1794 dev->flags |= ATA_DFLAG_NCQ;
1797 if (hdepth >= ddepth)
1798 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
1800 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
1804 * ata_dev_configure - Configure the specified ATA/ATAPI device
1805 * @dev: Target device to configure
1807 * Configure @dev according to @dev->id. Generic and low-level
1808 * driver specific fixups are also applied.
1811 * Kernel thread context (may sleep)
1814 * 0 on success, -errno otherwise
1816 int ata_dev_configure(struct ata_device *dev)
1818 struct ata_port *ap = dev->ap;
1819 struct ata_eh_context *ehc = &ap->eh_context;
1820 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1821 const u16 *id = dev->id;
1822 unsigned int xfer_mask;
1823 char revbuf[7]; /* XYZ-99\0 */
1824 char fwrevbuf[ATA_ID_FW_REV_LEN+1];
1825 char modelbuf[ATA_ID_PROD_LEN+1];
1828 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
1829 ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
1834 if (ata_msg_probe(ap))
1835 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
1838 dev->horkage |= ata_dev_blacklisted(dev);
1840 /* let ACPI work its magic */
1841 rc = ata_acpi_on_devcfg(dev);
1845 /* print device capabilities */
1846 if (ata_msg_probe(ap))
1847 ata_dev_printk(dev, KERN_DEBUG,
1848 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
1849 "85:%04x 86:%04x 87:%04x 88:%04x\n",
1851 id[49], id[82], id[83], id[84],
1852 id[85], id[86], id[87], id[88]);
1854 /* initialize to-be-configured parameters */
1855 dev->flags &= ~ATA_DFLAG_CFG_MASK;
1856 dev->max_sectors = 0;
1864 * common ATA, ATAPI feature tests
1867 /* find max transfer mode; for printk only */
1868 xfer_mask = ata_id_xfermask(id);
1870 if (ata_msg_probe(ap))
1873 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
1874 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
1877 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
1880 /* ATA-specific feature tests */
1881 if (dev->class == ATA_DEV_ATA) {
1882 if (ata_id_is_cfa(id)) {
1883 if (id[162] & 1) /* CPRM may make this media unusable */
1884 ata_dev_printk(dev, KERN_WARNING,
1885 "supports DRM functions and may "
1886 "not be fully accessable.\n");
1887 snprintf(revbuf, 7, "CFA");
1890 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
1892 dev->n_sectors = ata_id_n_sectors(id);
1894 if (dev->id[59] & 0x100)
1895 dev->multi_count = dev->id[59] & 0xff;
1897 if (ata_id_has_lba(id)) {
1898 const char *lba_desc;
1902 dev->flags |= ATA_DFLAG_LBA;
1903 if (ata_id_has_lba48(id)) {
1904 dev->flags |= ATA_DFLAG_LBA48;
1907 if (dev->n_sectors >= (1UL << 28) &&
1908 ata_id_has_flush_ext(id))
1909 dev->flags |= ATA_DFLAG_FLUSH_EXT;
1912 if (ata_id_hpa_enabled(dev->id))
1913 dev->n_sectors = ata_hpa_resize(dev);
1916 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
1918 /* print device info to dmesg */
1919 if (ata_msg_drv(ap) && print_info) {
1920 ata_dev_printk(dev, KERN_INFO,
1921 "%s: %s, %s, max %s\n",
1922 revbuf, modelbuf, fwrevbuf,
1923 ata_mode_string(xfer_mask));
1924 ata_dev_printk(dev, KERN_INFO,
1925 "%Lu sectors, multi %u: %s %s\n",
1926 (unsigned long long)dev->n_sectors,
1927 dev->multi_count, lba_desc, ncq_desc);
1932 /* Default translation */
1933 dev->cylinders = id[1];
1935 dev->sectors = id[6];
1937 if (ata_id_current_chs_valid(id)) {
1938 /* Current CHS translation is valid. */
1939 dev->cylinders = id[54];
1940 dev->heads = id[55];
1941 dev->sectors = id[56];
1944 /* print device info to dmesg */
1945 if (ata_msg_drv(ap) && print_info) {
1946 ata_dev_printk(dev, KERN_INFO,
1947 "%s: %s, %s, max %s\n",
1948 revbuf, modelbuf, fwrevbuf,
1949 ata_mode_string(xfer_mask));
1950 ata_dev_printk(dev, KERN_INFO,
1951 "%Lu sectors, multi %u, CHS %u/%u/%u\n",
1952 (unsigned long long)dev->n_sectors,
1953 dev->multi_count, dev->cylinders,
1954 dev->heads, dev->sectors);
1961 /* ATAPI-specific feature tests */
1962 else if (dev->class == ATA_DEV_ATAPI) {
1963 char *cdb_intr_string = "";
1965 rc = atapi_cdb_len(id);
1966 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1967 if (ata_msg_warn(ap))
1968 ata_dev_printk(dev, KERN_WARNING,
1969 "unsupported CDB len\n");
1973 dev->cdb_len = (unsigned int) rc;
1975 if (ata_id_cdb_intr(dev->id)) {
1976 dev->flags |= ATA_DFLAG_CDB_INTR;
1977 cdb_intr_string = ", CDB intr";
1980 /* print device info to dmesg */
1981 if (ata_msg_drv(ap) && print_info)
1982 ata_dev_printk(dev, KERN_INFO,
1983 "ATAPI: %s, %s, max %s%s\n",
1985 ata_mode_string(xfer_mask),
1989 /* determine max_sectors */
1990 dev->max_sectors = ATA_MAX_SECTORS;
1991 if (dev->flags & ATA_DFLAG_LBA48)
1992 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
1994 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
1995 /* Let the user know. We don't want to disallow opens for
1996 rescue purposes, or in case the vendor is just a blithering
1999 ata_dev_printk(dev, KERN_WARNING,
2000 "Drive reports diagnostics failure. This may indicate a drive\n");
2001 ata_dev_printk(dev, KERN_WARNING,
2002 "fault or invalid emulation. Contact drive vendor for information.\n");
2006 /* limit bridge transfers to udma5, 200 sectors */
2007 if (ata_dev_knobble(dev)) {
2008 if (ata_msg_drv(ap) && print_info)
2009 ata_dev_printk(dev, KERN_INFO,
2010 "applying bridge limits\n");
2011 dev->udma_mask &= ATA_UDMA5;
2012 dev->max_sectors = ATA_MAX_SECTORS;
2015 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2016 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2019 if (ap->ops->dev_config)
2020 ap->ops->dev_config(dev);
2022 if (ata_msg_probe(ap))
2023 ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
2024 __FUNCTION__, ata_chk_status(ap));
2028 if (ata_msg_probe(ap))
2029 ata_dev_printk(dev, KERN_DEBUG,
2030 "%s: EXIT, err\n", __FUNCTION__);
2035 * ata_cable_40wire - return 40 wire cable type
2038 * Helper method for drivers which want to hardwire 40 wire cable
2042 int ata_cable_40wire(struct ata_port *ap)
2044 return ATA_CBL_PATA40;
2048 * ata_cable_80wire - return 80 wire cable type
2051 * Helper method for drivers which want to hardwire 80 wire cable
2055 int ata_cable_80wire(struct ata_port *ap)
2057 return ATA_CBL_PATA80;
2061 * ata_cable_unknown - return unknown PATA cable.
2064 * Helper method for drivers which have no PATA cable detection.
2067 int ata_cable_unknown(struct ata_port *ap)
2069 return ATA_CBL_PATA_UNK;
2073 * ata_cable_sata - return SATA cable type
2076 * Helper method for drivers which have SATA cables
2079 int ata_cable_sata(struct ata_port *ap)
2081 return ATA_CBL_SATA;
2085 * ata_bus_probe - Reset and probe ATA bus
2088 * Master ATA bus probing function. Initiates a hardware-dependent
2089 * bus reset, then attempts to identify any devices found on
2093 * PCI/etc. bus probe sem.
2096 * Zero on success, negative errno otherwise.
2099 int ata_bus_probe(struct ata_port *ap)
2101 unsigned int classes[ATA_MAX_DEVICES];
2102 int tries[ATA_MAX_DEVICES];
2104 struct ata_device *dev;
2108 for (i = 0; i < ATA_MAX_DEVICES; i++)
2109 tries[i] = ATA_PROBE_MAX_TRIES;
2112 /* reset and determine device classes */
2113 ap->ops->phy_reset(ap);
2115 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2116 dev = &ap->device[i];
2118 if (!(ap->flags & ATA_FLAG_DISABLED) &&
2119 dev->class != ATA_DEV_UNKNOWN)
2120 classes[dev->devno] = dev->class;
2122 classes[dev->devno] = ATA_DEV_NONE;
2124 dev->class = ATA_DEV_UNKNOWN;
2129 /* after the reset the device state is PIO 0 and the controller
2130 state is undefined. Record the mode */
2132 for (i = 0; i < ATA_MAX_DEVICES; i++)
2133 ap->device[i].pio_mode = XFER_PIO_0;
2135 /* read IDENTIFY page and configure devices. We have to do the identify
2136 specific sequence bass-ackwards so that PDIAG- is released by
2139 for (i = ATA_MAX_DEVICES - 1; i >= 0; i--) {
2140 dev = &ap->device[i];
2143 dev->class = classes[i];
2145 if (!ata_dev_enabled(dev))
2148 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2154 /* Now ask for the cable type as PDIAG- should have been released */
2155 if (ap->ops->cable_detect)
2156 ap->cbl = ap->ops->cable_detect(ap);
2158 /* After the identify sequence we can now set up the devices. We do
2159 this in the normal order so that the user doesn't get confused */
2161 for(i = 0; i < ATA_MAX_DEVICES; i++) {
2162 dev = &ap->device[i];
2163 if (!ata_dev_enabled(dev))
2166 ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
2167 rc = ata_dev_configure(dev);
2168 ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2173 /* configure transfer mode */
2174 rc = ata_set_mode(ap, &dev);
2178 for (i = 0; i < ATA_MAX_DEVICES; i++)
2179 if (ata_dev_enabled(&ap->device[i]))
2182 /* no device present, disable port */
2183 ata_port_disable(ap);
2184 ap->ops->port_disable(ap);
2188 tries[dev->devno]--;
2192 /* eeek, something went very wrong, give up */
2193 tries[dev->devno] = 0;
2197 /* give it just one more chance */
2198 tries[dev->devno] = min(tries[dev->devno], 1);
2200 if (tries[dev->devno] == 1) {
2201 /* This is the last chance, better to slow
2202 * down than lose it.
2204 sata_down_spd_limit(ap);
2205 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2209 if (!tries[dev->devno])
2210 ata_dev_disable(dev);
2216 * ata_port_probe - Mark port as enabled
2217 * @ap: Port for which we indicate enablement
2219 * Modify @ap data structure such that the system
2220 * thinks that the entire port is enabled.
2222 * LOCKING: host lock, or some other form of
2226 void ata_port_probe(struct ata_port *ap)
2228 ap->flags &= ~ATA_FLAG_DISABLED;
2232 * sata_print_link_status - Print SATA link status
2233 * @ap: SATA port to printk link status about
2235 * This function prints link speed and status of a SATA link.
2240 void sata_print_link_status(struct ata_port *ap)
2242 u32 sstatus, scontrol, tmp;
2244 if (sata_scr_read(ap, SCR_STATUS, &sstatus))
2246 sata_scr_read(ap, SCR_CONTROL, &scontrol);
2248 if (ata_port_online(ap)) {
2249 tmp = (sstatus >> 4) & 0xf;
2250 ata_port_printk(ap, KERN_INFO,
2251 "SATA link up %s (SStatus %X SControl %X)\n",
2252 sata_spd_string(tmp), sstatus, scontrol);
2254 ata_port_printk(ap, KERN_INFO,
2255 "SATA link down (SStatus %X SControl %X)\n",
2261 * __sata_phy_reset - Wake/reset a low-level SATA PHY
2262 * @ap: SATA port associated with target SATA PHY.
2264 * This function issues commands to standard SATA Sxxx
2265 * PHY registers, to wake up the phy (and device), and
2266 * clear any reset condition.
2269 * PCI/etc. bus probe sem.
2272 void __sata_phy_reset(struct ata_port *ap)
2275 unsigned long timeout = jiffies + (HZ * 5);
2277 if (ap->flags & ATA_FLAG_SATA_RESET) {
2278 /* issue phy wake/reset */
2279 sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
2280 /* Couldn't find anything in SATA I/II specs, but
2281 * AHCI-1.1 10.4.2 says at least 1 ms. */
2284 /* phy wake/clear reset */
2285 sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
2287 /* wait for phy to become ready, if necessary */
2290 sata_scr_read(ap, SCR_STATUS, &sstatus);
2291 if ((sstatus & 0xf) != 1)
2293 } while (time_before(jiffies, timeout));
2295 /* print link status */
2296 sata_print_link_status(ap);
2298 /* TODO: phy layer with polling, timeouts, etc. */
2299 if (!ata_port_offline(ap))
2302 ata_port_disable(ap);
2304 if (ap->flags & ATA_FLAG_DISABLED)
2307 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2308 ata_port_disable(ap);
2312 ap->cbl = ATA_CBL_SATA;
2316 * sata_phy_reset - Reset SATA bus.
2317 * @ap: SATA port associated with target SATA PHY.
2319 * This function resets the SATA bus, and then probes
2320 * the bus for devices.
2323 * PCI/etc. bus probe sem.
2326 void sata_phy_reset(struct ata_port *ap)
2328 __sata_phy_reset(ap);
2329 if (ap->flags & ATA_FLAG_DISABLED)
2335 * ata_dev_pair - return other device on cable
2338 * Obtain the other device on the same cable, or if none is
2339 * present NULL is returned
2342 struct ata_device *ata_dev_pair(struct ata_device *adev)
2344 struct ata_port *ap = adev->ap;
2345 struct ata_device *pair = &ap->device[1 - adev->devno];
2346 if (!ata_dev_enabled(pair))
2352 * ata_port_disable - Disable port.
2353 * @ap: Port to be disabled.
2355 * Modify @ap data structure such that the system
2356 * thinks that the entire port is disabled, and should
2357 * never attempt to probe or communicate with devices
2360 * LOCKING: host lock, or some other form of
2364 void ata_port_disable(struct ata_port *ap)
2366 ap->device[0].class = ATA_DEV_NONE;
2367 ap->device[1].class = ATA_DEV_NONE;
2368 ap->flags |= ATA_FLAG_DISABLED;
2372 * sata_down_spd_limit - adjust SATA spd limit downward
2373 * @ap: Port to adjust SATA spd limit for
2375 * Adjust SATA spd limit of @ap downward. Note that this
2376 * function only adjusts the limit. The change must be applied
2377 * using sata_set_spd().
2380 * Inherited from caller.
2383 * 0 on success, negative errno on failure
2385 int sata_down_spd_limit(struct ata_port *ap)
2387 u32 sstatus, spd, mask;
2390 rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
2394 mask = ap->sata_spd_limit;
2397 highbit = fls(mask) - 1;
2398 mask &= ~(1 << highbit);
2400 spd = (sstatus >> 4) & 0xf;
2404 mask &= (1 << spd) - 1;
2408 ap->sata_spd_limit = mask;
2410 ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
2411 sata_spd_string(fls(mask)));
2416 static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2420 if (ap->sata_spd_limit == UINT_MAX)
2423 limit = fls(ap->sata_spd_limit);
2425 spd = (*scontrol >> 4) & 0xf;
2426 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
2428 return spd != limit;
2432 * sata_set_spd_needed - is SATA spd configuration needed
2433 * @ap: Port in question
2435 * Test whether the spd limit in SControl matches
2436 * @ap->sata_spd_limit. This function is used to determine
2437 * whether hardreset is necessary to apply SATA spd
2441 * Inherited from caller.
2444 * 1 if SATA spd configuration is needed, 0 otherwise.
2446 int sata_set_spd_needed(struct ata_port *ap)
2450 if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2453 return __sata_set_spd_needed(ap, &scontrol);
2457 * sata_set_spd - set SATA spd according to spd limit
2458 * @ap: Port to set SATA spd for
2460 * Set SATA spd of @ap according to sata_spd_limit.
2463 * Inherited from caller.
2466 * 0 if spd doesn't need to be changed, 1 if spd has been
2467 * changed. Negative errno if SCR registers are inaccessible.
2469 int sata_set_spd(struct ata_port *ap)
2474 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2477 if (!__sata_set_spd_needed(ap, &scontrol))
2480 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2487 * This mode timing computation functionality is ported over from
2488 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
2491 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
2492 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2493 * for UDMA6, which is currently supported only by Maxtor drives.
2495 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
2498 static const struct ata_timing ata_timing[] = {
2500 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
2501 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
2502 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
2503 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
2505 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
2506 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 },
2507 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
2508 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
2509 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
2511 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
2513 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
2514 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
2515 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
2517 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
2518 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
2519 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
2521 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
2522 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
2523 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
2524 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
2526 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
2527 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
2528 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
2530 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
2535 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
2536 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
2538 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
2540 q->setup = EZ(t->setup * 1000, T);
2541 q->act8b = EZ(t->act8b * 1000, T);
2542 q->rec8b = EZ(t->rec8b * 1000, T);
2543 q->cyc8b = EZ(t->cyc8b * 1000, T);
2544 q->active = EZ(t->active * 1000, T);
2545 q->recover = EZ(t->recover * 1000, T);
2546 q->cycle = EZ(t->cycle * 1000, T);
2547 q->udma = EZ(t->udma * 1000, UT);
2550 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
2551 struct ata_timing *m, unsigned int what)
2553 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
2554 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
2555 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
2556 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
2557 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
2558 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
2559 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
2560 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
2563 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
2565 const struct ata_timing *t;
2567 for (t = ata_timing; t->mode != speed; t++)
2568 if (t->mode == 0xFF)
2573 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
2574 struct ata_timing *t, int T, int UT)
2576 const struct ata_timing *s;
2577 struct ata_timing p;
2583 if (!(s = ata_timing_find_mode(speed)))
2586 memcpy(t, s, sizeof(*s));
2589 * If the drive is an EIDE drive, it can tell us it needs extended
2590 * PIO/MW_DMA cycle timing.
2593 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
2594 memset(&p, 0, sizeof(p));
2595 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
2596 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
2597 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
2598 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
2599 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
2601 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
2605 * Convert the timing to bus clock counts.
2608 ata_timing_quantize(t, t, T, UT);
2611 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2612 * S.M.A.R.T * and some other commands. We have to ensure that the
2613 * DMA cycle timing is slower/equal than the fastest PIO timing.
2616 if (speed > XFER_PIO_6) {
2617 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
2618 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
2622 * Lengthen active & recovery time so that cycle time is correct.
2625 if (t->act8b + t->rec8b < t->cyc8b) {
2626 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
2627 t->rec8b = t->cyc8b - t->act8b;
2630 if (t->active + t->recover < t->cycle) {
2631 t->active += (t->cycle - (t->active + t->recover)) / 2;
2632 t->recover = t->cycle - t->active;
2635 /* In a few cases quantisation may produce enough errors to
2636 leave t->cycle too low for the sum of active and recovery
2637 if so we must correct this */
2638 if (t->active + t->recover > t->cycle)
2639 t->cycle = t->active + t->recover;
2645 * ata_down_xfermask_limit - adjust dev xfer masks downward
2646 * @dev: Device to adjust xfer masks
2647 * @sel: ATA_DNXFER_* selector
2649 * Adjust xfer masks of @dev downward. Note that this function
2650 * does not apply the change. Invoking ata_set_mode() afterwards
2651 * will apply the limit.
2654 * Inherited from caller.
2657 * 0 on success, negative errno on failure
2659 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2662 unsigned int orig_mask, xfer_mask;
2663 unsigned int pio_mask, mwdma_mask, udma_mask;
2666 quiet = !!(sel & ATA_DNXFER_QUIET);
2667 sel &= ~ATA_DNXFER_QUIET;
2669 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
2672 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
2675 case ATA_DNXFER_PIO:
2676 highbit = fls(pio_mask) - 1;
2677 pio_mask &= ~(1 << highbit);
2680 case ATA_DNXFER_DMA:
2682 highbit = fls(udma_mask) - 1;
2683 udma_mask &= ~(1 << highbit);
2686 } else if (mwdma_mask) {
2687 highbit = fls(mwdma_mask) - 1;
2688 mwdma_mask &= ~(1 << highbit);
2694 case ATA_DNXFER_40C:
2695 udma_mask &= ATA_UDMA_MASK_40C;
2698 case ATA_DNXFER_FORCE_PIO0:
2700 case ATA_DNXFER_FORCE_PIO:
2709 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
2711 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
2715 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
2716 snprintf(buf, sizeof(buf), "%s:%s",
2717 ata_mode_string(xfer_mask),
2718 ata_mode_string(xfer_mask & ATA_MASK_PIO));
2720 snprintf(buf, sizeof(buf), "%s",
2721 ata_mode_string(xfer_mask));
2723 ata_dev_printk(dev, KERN_WARNING,
2724 "limiting speed to %s\n", buf);
2727 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2733 static int ata_dev_set_mode(struct ata_device *dev)
2735 struct ata_eh_context *ehc = &dev->ap->eh_context;
2736 unsigned int err_mask;
2739 dev->flags &= ~ATA_DFLAG_PIO;
2740 if (dev->xfer_shift == ATA_SHIFT_PIO)
2741 dev->flags |= ATA_DFLAG_PIO;
2743 err_mask = ata_dev_set_xfermode(dev);
2744 /* Old CFA may refuse this command, which is just fine */
2745 if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
2746 err_mask &= ~AC_ERR_DEV;
2749 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
2750 "(err_mask=0x%x)\n", err_mask);
2754 ehc->i.flags |= ATA_EHI_POST_SETMODE;
2755 rc = ata_dev_revalidate(dev, 0);
2756 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2760 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2761 dev->xfer_shift, (int)dev->xfer_mode);
2763 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
2764 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2769 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER
2770 * @ap: port on which timings will be programmed
2771 * @r_failed_dev: out paramter for failed device
2773 * Standard implementation of the function used to tune and set
2774 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2775 * ata_dev_set_mode() fails, pointer to the failing device is
2776 * returned in @r_failed_dev.
2779 * PCI/etc. bus probe sem.
2782 * 0 on success, negative errno otherwise
2785 int ata_do_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
2787 struct ata_device *dev;
2788 int i, rc = 0, used_dma = 0, found = 0;
2791 /* step 1: calculate xfer_mask */
2792 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2793 unsigned int pio_mask, dma_mask;
2795 dev = &ap->device[i];
2797 if (!ata_dev_enabled(dev))
2800 ata_dev_xfermask(dev);
2802 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2803 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2804 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2805 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2814 /* step 2: always set host PIO timings */
2815 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2816 dev = &ap->device[i];
2817 if (!ata_dev_enabled(dev))
2820 if (!dev->pio_mode) {
2821 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2826 dev->xfer_mode = dev->pio_mode;
2827 dev->xfer_shift = ATA_SHIFT_PIO;
2828 if (ap->ops->set_piomode)
2829 ap->ops->set_piomode(ap, dev);
2832 /* step 3: set host DMA timings */
2833 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2834 dev = &ap->device[i];
2836 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2839 dev->xfer_mode = dev->dma_mode;
2840 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2841 if (ap->ops->set_dmamode)
2842 ap->ops->set_dmamode(ap, dev);
2845 /* step 4: update devices' xfer mode */
2846 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2847 dev = &ap->device[i];
2849 /* don't update suspended devices' xfer mode */
2850 if (!ata_dev_enabled(dev))
2853 rc = ata_dev_set_mode(dev);
2858 /* Record simplex status. If we selected DMA then the other
2859 * host channels are not permitted to do so.
2861 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
2862 ap->host->simplex_claimed = ap;
2866 *r_failed_dev = dev;
2871 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2872 * @ap: port on which timings will be programmed
2873 * @r_failed_dev: out paramter for failed device
2875 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2876 * ata_set_mode() fails, pointer to the failing device is
2877 * returned in @r_failed_dev.
2880 * PCI/etc. bus probe sem.
2883 * 0 on success, negative errno otherwise
2885 int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
2887 /* has private set_mode? */
2888 if (ap->ops->set_mode)
2889 return ap->ops->set_mode(ap, r_failed_dev);
2890 return ata_do_set_mode(ap, r_failed_dev);
2894 * ata_tf_to_host - issue ATA taskfile to host controller
2895 * @ap: port to which command is being issued
2896 * @tf: ATA taskfile register set
2898 * Issues ATA taskfile register set to ATA host controller,
2899 * with proper synchronization with interrupt handler and
2903 * spin_lock_irqsave(host lock)
2906 static inline void ata_tf_to_host(struct ata_port *ap,
2907 const struct ata_taskfile *tf)
2909 ap->ops->tf_load(ap, tf);
2910 ap->ops->exec_command(ap, tf);
2914 * ata_busy_sleep - sleep until BSY clears, or timeout
2915 * @ap: port containing status register to be polled
2916 * @tmout_pat: impatience timeout
2917 * @tmout: overall timeout
2919 * Sleep until ATA Status register bit BSY clears,
2920 * or a timeout occurs.
2923 * Kernel thread context (may sleep).
2926 * 0 on success, -errno otherwise.
2928 int ata_busy_sleep(struct ata_port *ap,
2929 unsigned long tmout_pat, unsigned long tmout)
2931 unsigned long timer_start, timeout;
2934 status = ata_busy_wait(ap, ATA_BUSY, 300);
2935 timer_start = jiffies;
2936 timeout = timer_start + tmout_pat;
2937 while (status != 0xff && (status & ATA_BUSY) &&
2938 time_before(jiffies, timeout)) {
2940 status = ata_busy_wait(ap, ATA_BUSY, 3);
2943 if (status != 0xff && (status & ATA_BUSY))
2944 ata_port_printk(ap, KERN_WARNING,
2945 "port is slow to respond, please be patient "
2946 "(Status 0x%x)\n", status);
2948 timeout = timer_start + tmout;
2949 while (status != 0xff && (status & ATA_BUSY) &&
2950 time_before(jiffies, timeout)) {
2952 status = ata_chk_status(ap);
2958 if (status & ATA_BUSY) {
2959 ata_port_printk(ap, KERN_ERR, "port failed to respond "
2960 "(%lu secs, Status 0x%x)\n",
2961 tmout / HZ, status);
2969 * ata_wait_ready - sleep until BSY clears, or timeout
2970 * @ap: port containing status register to be polled
2971 * @deadline: deadline jiffies for the operation
2973 * Sleep until ATA Status register bit BSY clears, or timeout
2977 * Kernel thread context (may sleep).
2980 * 0 on success, -errno otherwise.
2982 int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
2984 unsigned long start = jiffies;
2988 u8 status = ata_chk_status(ap);
2989 unsigned long now = jiffies;
2991 if (!(status & ATA_BUSY))
2993 if (!ata_port_online(ap) && status == 0xff)
2995 if (time_after(now, deadline))
2998 if (!warned && time_after(now, start + 5 * HZ) &&
2999 (deadline - now > 3 * HZ)) {
3000 ata_port_printk(ap, KERN_WARNING,
3001 "port is slow to respond, please be patient "
3002 "(Status 0x%x)\n", status);
3010 static int ata_bus_post_reset(struct ata_port *ap, unsigned int devmask,
3011 unsigned long deadline)
3013 struct ata_ioports *ioaddr = &ap->ioaddr;
3014 unsigned int dev0 = devmask & (1 << 0);
3015 unsigned int dev1 = devmask & (1 << 1);
3018 /* if device 0 was found in ata_devchk, wait for its
3022 rc = ata_wait_ready(ap, deadline);
3030 /* if device 1 was found in ata_devchk, wait for register
3031 * access briefly, then wait for BSY to clear.
3036 ap->ops->dev_select(ap, 1);
3038 /* Wait for register access. Some ATAPI devices fail
3039 * to set nsect/lbal after reset, so don't waste too
3040 * much time on it. We're gonna wait for !BSY anyway.
3042 for (i = 0; i < 2; i++) {
3045 nsect = ioread8(ioaddr->nsect_addr);
3046 lbal = ioread8(ioaddr->lbal_addr);
3047 if ((nsect == 1) && (lbal == 1))
3049 msleep(50); /* give drive a breather */
3052 rc = ata_wait_ready(ap, deadline);
3060 /* is all this really necessary? */
3061 ap->ops->dev_select(ap, 0);
3063 ap->ops->dev_select(ap, 1);
3065 ap->ops->dev_select(ap, 0);
3070 static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
3071 unsigned long deadline)
3073 struct ata_ioports *ioaddr = &ap->ioaddr;
3075 DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
3077 /* software reset. causes dev0 to be selected */
3078 iowrite8(ap->ctl, ioaddr->ctl_addr);
3079 udelay(20); /* FIXME: flush */
3080 iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
3081 udelay(20); /* FIXME: flush */
3082 iowrite8(ap->ctl, ioaddr->ctl_addr);
3084 /* spec mandates ">= 2ms" before checking status.
3085 * We wait 150ms, because that was the magic delay used for
3086 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
3087 * between when the ATA command register is written, and then
3088 * status is checked. Because waiting for "a while" before
3089 * checking status is fine, post SRST, we perform this magic
3090 * delay here as well.
3092 * Old drivers/ide uses the 2mS rule and then waits for ready
3096 /* Before we perform post reset processing we want to see if
3097 * the bus shows 0xFF because the odd clown forgets the D7
3098 * pulldown resistor.
3100 if (ata_check_status(ap) == 0xFF)
3103 return ata_bus_post_reset(ap, devmask, deadline);
3107 * ata_bus_reset - reset host port and associated ATA channel
3108 * @ap: port to reset
3110 * This is typically the first time we actually start issuing
3111 * commands to the ATA channel. We wait for BSY to clear, then
3112 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
3113 * result. Determine what devices, if any, are on the channel
3114 * by looking at the device 0/1 error register. Look at the signature
3115 * stored in each device's taskfile registers, to determine if
3116 * the device is ATA or ATAPI.
3119 * PCI/etc. bus probe sem.
3120 * Obtains host lock.
3123 * Sets ATA_FLAG_DISABLED if bus reset fails.
3126 void ata_bus_reset(struct ata_port *ap)
3128 struct ata_ioports *ioaddr = &ap->ioaddr;
3129 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3131 unsigned int dev0, dev1 = 0, devmask = 0;
3134 DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
3136 /* determine if device 0/1 are present */
3137 if (ap->flags & ATA_FLAG_SATA_RESET)
3140 dev0 = ata_devchk(ap, 0);
3142 dev1 = ata_devchk(ap, 1);
3146 devmask |= (1 << 0);
3148 devmask |= (1 << 1);
3150 /* select device 0 again */
3151 ap->ops->dev_select(ap, 0);
3153 /* issue bus reset */
3154 if (ap->flags & ATA_FLAG_SRST) {
3155 rc = ata_bus_softreset(ap, devmask, jiffies + 40 * HZ);
3156 if (rc && rc != -ENODEV)
3161 * determine by signature whether we have ATA or ATAPI devices
3163 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
3164 if ((slave_possible) && (err != 0x81))
3165 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
3167 /* re-enable interrupts */
3168 ap->ops->irq_on(ap);
3170 /* is double-select really necessary? */
3171 if (ap->device[1].class != ATA_DEV_NONE)
3172 ap->ops->dev_select(ap, 1);
3173 if (ap->device[0].class != ATA_DEV_NONE)
3174 ap->ops->dev_select(ap, 0);
3176 /* if no devices were detected, disable this port */
3177 if ((ap->device[0].class == ATA_DEV_NONE) &&
3178 (ap->device[1].class == ATA_DEV_NONE))
3181 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
3182 /* set up device control for ATA_FLAG_SATA_RESET */
3183 iowrite8(ap->ctl, ioaddr->ctl_addr);
3190 ata_port_printk(ap, KERN_ERR, "disabling port\n");
3191 ap->ops->port_disable(ap);
3197 * sata_phy_debounce - debounce SATA phy status
3198 * @ap: ATA port to debounce SATA phy status for
3199 * @params: timing parameters { interval, duratinon, timeout } in msec
3200 * @deadline: deadline jiffies for the operation
3202 * Make sure SStatus of @ap reaches stable state, determined by
3203 * holding the same value where DET is not 1 for @duration polled
3204 * every @interval, before @timeout. Timeout constraints the
3205 * beginning of the stable state. Because DET gets stuck at 1 on
3206 * some controllers after hot unplugging, this functions waits
3207 * until timeout then returns 0 if DET is stable at 1.
3209 * @timeout is further limited by @deadline. The sooner of the
3213 * Kernel thread context (may sleep)
3216 * 0 on success, -errno on failure.
3218 int sata_phy_debounce(struct ata_port *ap, const unsigned long *params,
3219 unsigned long deadline)
3221 unsigned long interval_msec = params[0];
3222 unsigned long duration = msecs_to_jiffies(params[1]);
3223 unsigned long last_jiffies, t;
3227 t = jiffies + msecs_to_jiffies(params[2]);
3228 if (time_before(t, deadline))
3231 if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
3236 last_jiffies = jiffies;
3239 msleep(interval_msec);
3240 if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
3246 if (cur == 1 && time_before(jiffies, deadline))
3248 if (time_after(jiffies, last_jiffies + duration))
3253 /* unstable, start over */
3255 last_jiffies = jiffies;
3257 /* check deadline */
3258 if (time_after(jiffies, deadline))
3264 * sata_phy_resume - resume SATA phy
3265 * @ap: ATA port to resume SATA phy for
3266 * @params: timing parameters { interval, duratinon, timeout } in msec
3267 * @deadline: deadline jiffies for the operation
3269 * Resume SATA phy of @ap and debounce it.
3272 * Kernel thread context (may sleep)
3275 * 0 on success, -errno on failure.
3277 int sata_phy_resume(struct ata_port *ap, const unsigned long *params,
3278 unsigned long deadline)
3283 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3286 scontrol = (scontrol & 0x0f0) | 0x300;
3288 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3291 /* Some PHYs react badly if SStatus is pounded immediately
3292 * after resuming. Delay 200ms before debouncing.
3296 return sata_phy_debounce(ap, params, deadline);
3300 * ata_std_prereset - prepare for reset
3301 * @ap: ATA port to be reset
3302 * @deadline: deadline jiffies for the operation
3304 * @ap is about to be reset. Initialize it. Failure from
3305 * prereset makes libata abort whole reset sequence and give up
3306 * that port, so prereset should be best-effort. It does its
3307 * best to prepare for reset sequence but if things go wrong, it
3308 * should just whine, not fail.
3311 * Kernel thread context (may sleep)
3314 * 0 on success, -errno otherwise.
3316 int ata_std_prereset(struct ata_port *ap, unsigned long deadline)
3318 struct ata_eh_context *ehc = &ap->eh_context;
3319 const unsigned long *timing = sata_ehc_deb_timing(ehc);
3322 /* handle link resume */
3323 if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
3324 (ap->flags & ATA_FLAG_HRST_TO_RESUME))
3325 ehc->i.action |= ATA_EH_HARDRESET;
3327 /* if we're about to do hardreset, nothing more to do */
3328 if (ehc->i.action & ATA_EH_HARDRESET)
3331 /* if SATA, resume phy */
3332 if (ap->flags & ATA_FLAG_SATA) {
3333 rc = sata_phy_resume(ap, timing, deadline);
3334 /* whine about phy resume failure but proceed */
3335 if (rc && rc != -EOPNOTSUPP)
3336 ata_port_printk(ap, KERN_WARNING, "failed to resume "
3337 "link for reset (errno=%d)\n", rc);
3340 /* Wait for !BSY if the controller can wait for the first D2H
3341 * Reg FIS and we don't know that no device is attached.
3343 if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap)) {
3344 rc = ata_wait_ready(ap, deadline);
3345 if (rc && rc != -ENODEV) {
3346 ata_port_printk(ap, KERN_WARNING, "device not ready "
3347 "(errno=%d), forcing hardreset\n", rc);
3348 ehc->i.action |= ATA_EH_HARDRESET;
3356 * ata_std_softreset - reset host port via ATA SRST
3357 * @ap: port to reset
3358 * @classes: resulting classes of attached devices
3359 * @deadline: deadline jiffies for the operation
3361 * Reset host port using ATA SRST.
3364 * Kernel thread context (may sleep)
3367 * 0 on success, -errno otherwise.
3369 int ata_std_softreset(struct ata_port *ap, unsigned int *classes,
3370 unsigned long deadline)
3372 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3373 unsigned int devmask = 0;
3379 if (ata_port_offline(ap)) {
3380 classes[0] = ATA_DEV_NONE;
3384 /* determine if device 0/1 are present */
3385 if (ata_devchk(ap, 0))
3386 devmask |= (1 << 0);
3387 if (slave_possible && ata_devchk(ap, 1))
3388 devmask |= (1 << 1);
3390 /* select device 0 again */
3391 ap->ops->dev_select(ap, 0);
3393 /* issue bus reset */
3394 DPRINTK("about to softreset, devmask=%x\n", devmask);
3395 rc = ata_bus_softreset(ap, devmask, deadline);
3396 /* if link is occupied, -ENODEV too is an error */
3397 if (rc && (rc != -ENODEV || sata_scr_valid(ap))) {
3398 ata_port_printk(ap, KERN_ERR, "SRST failed (errno=%d)\n", rc);
3402 /* determine by signature whether we have ATA or ATAPI devices */
3403 classes[0] = ata_dev_try_classify(ap, 0, &err);
3404 if (slave_possible && err != 0x81)
3405 classes[1] = ata_dev_try_classify(ap, 1, &err);
3408 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
3413 * sata_port_hardreset - reset port via SATA phy reset
3414 * @ap: port to reset
3415 * @timing: timing parameters { interval, duratinon, timeout } in msec
3416 * @deadline: deadline jiffies for the operation
3418 * SATA phy-reset host port using DET bits of SControl register.
3421 * Kernel thread context (may sleep)
3424 * 0 on success, -errno otherwise.
3426 int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing,
3427 unsigned long deadline)
3434 if (sata_set_spd_needed(ap)) {
3435 /* SATA spec says nothing about how to reconfigure
3436 * spd. To be on the safe side, turn off phy during
3437 * reconfiguration. This works for at least ICH7 AHCI
3440 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3443 scontrol = (scontrol & 0x0f0) | 0x304;
3445 if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3451 /* issue phy wake/reset */
3452 if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3455 scontrol = (scontrol & 0x0f0) | 0x301;
3457 if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3460 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3461 * 10.4.2 says at least 1 ms.
3465 /* bring phy back */
3466 rc = sata_phy_resume(ap, timing, deadline);
3468 DPRINTK("EXIT, rc=%d\n", rc);
3473 * sata_std_hardreset - reset host port via SATA phy reset
3474 * @ap: port to reset
3475 * @class: resulting class of attached device
3476 * @deadline: deadline jiffies for the operation
3478 * SATA phy-reset host port using DET bits of SControl register,
3479 * wait for !BSY and classify the attached device.
3482 * Kernel thread context (may sleep)
3485 * 0 on success, -errno otherwise.
3487 int sata_std_hardreset(struct ata_port *ap, unsigned int *class,
3488 unsigned long deadline)
3490 const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
3496 rc = sata_port_hardreset(ap, timing, deadline);
3498 ata_port_printk(ap, KERN_ERR,
3499 "COMRESET failed (errno=%d)\n", rc);
3503 /* TODO: phy layer with polling, timeouts, etc. */
3504 if (ata_port_offline(ap)) {
3505 *class = ATA_DEV_NONE;
3506 DPRINTK("EXIT, link offline\n");
3510 /* wait a while before checking status, see SRST for more info */
3513 rc = ata_wait_ready(ap, deadline);
3514 /* link occupied, -ENODEV too is an error */
3516 ata_port_printk(ap, KERN_ERR,
3517 "COMRESET failed (errno=%d)\n", rc);
3521 ap->ops->dev_select(ap, 0); /* probably unnecessary */
3523 *class = ata_dev_try_classify(ap, 0, NULL);
3525 DPRINTK("EXIT, class=%u\n", *class);
3530 * ata_std_postreset - standard postreset callback
3531 * @ap: the target ata_port
3532 * @classes: classes of attached devices
3534 * This function is invoked after a successful reset. Note that
3535 * the device might have been reset more than once using
3536 * different reset methods before postreset is invoked.
3539 * Kernel thread context (may sleep)
3541 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
3547 /* print link status */
3548 sata_print_link_status(ap);
3551 if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
3552 sata_scr_write(ap, SCR_ERROR, serror);
3554 /* re-enable interrupts */
3555 if (!ap->ops->error_handler)
3556 ap->ops->irq_on(ap);
3558 /* is double-select really necessary? */
3559 if (classes[0] != ATA_DEV_NONE)
3560 ap->ops->dev_select(ap, 1);
3561 if (classes[1] != ATA_DEV_NONE)
3562 ap->ops->dev_select(ap, 0);
3564 /* bail out if no device is present */
3565 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
3566 DPRINTK("EXIT, no device\n");
3570 /* set up device control */
3571 if (ap->ioaddr.ctl_addr)
3572 iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3578 * ata_dev_same_device - Determine whether new ID matches configured device
3579 * @dev: device to compare against
3580 * @new_class: class of the new device
3581 * @new_id: IDENTIFY page of the new device
3583 * Compare @new_class and @new_id against @dev and determine
3584 * whether @dev is the device indicated by @new_class and
3591 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
3593 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
3596 const u16 *old_id = dev->id;
3597 unsigned char model[2][ATA_ID_PROD_LEN + 1];
3598 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3600 if (dev->class != new_class) {
3601 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
3602 dev->class, new_class);
3606 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
3607 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
3608 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
3609 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3611 if (strcmp(model[0], model[1])) {
3612 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
3613 "'%s' != '%s'\n", model[0], model[1]);
3617 if (strcmp(serial[0], serial[1])) {
3618 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
3619 "'%s' != '%s'\n", serial[0], serial[1]);
3627 * ata_dev_reread_id - Re-read IDENTIFY data
3628 * @dev: target ATA device
3629 * @readid_flags: read ID flags
3631 * Re-read IDENTIFY page and make sure @dev is still attached to
3635 * Kernel thread context (may sleep)
3638 * 0 on success, negative errno otherwise
3640 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3642 unsigned int class = dev->class;
3643 u16 *id = (void *)dev->ap->sector_buf;
3647 rc = ata_dev_read_id(dev, &class, readid_flags, id);
3651 /* is the device still there? */
3652 if (!ata_dev_same_device(dev, class, id))
3655 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3660 * ata_dev_revalidate - Revalidate ATA device
3661 * @dev: device to revalidate
3662 * @readid_flags: read ID flags
3664 * Re-read IDENTIFY page, make sure @dev is still attached to the
3665 * port and reconfigure it according to the new IDENTIFY page.
3668 * Kernel thread context (may sleep)
3671 * 0 on success, negative errno otherwise
3673 int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
3675 u64 n_sectors = dev->n_sectors;
3678 if (!ata_dev_enabled(dev))
3682 rc = ata_dev_reread_id(dev, readid_flags);
3686 /* configure device according to the new ID */
3687 rc = ata_dev_configure(dev);
3691 /* verify n_sectors hasn't changed */
3692 if (dev->class == ATA_DEV_ATA && dev->n_sectors != n_sectors) {
3693 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
3695 (unsigned long long)n_sectors,
3696 (unsigned long long)dev->n_sectors);
3704 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3708 struct ata_blacklist_entry {
3709 const char *model_num;
3710 const char *model_rev;
3711 unsigned long horkage;
3714 static const struct ata_blacklist_entry ata_device_blacklist [] = {
3715 /* Devices with DMA related problems under Linux */
3716 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
3717 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
3718 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
3719 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
3720 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
3721 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
3722 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
3723 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
3724 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
3725 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
3726 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
3727 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
3728 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
3729 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
3730 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
3731 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
3732 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
3733 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
3734 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
3735 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
3736 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
3737 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
3738 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
3739 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
3740 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
3741 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
3742 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
3743 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
3744 { "SAMSUNG CD-ROM SN-124","N001", ATA_HORKAGE_NODMA },
3745 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA },
3746 { "IOMEGA ZIP 250 ATAPI", NULL, ATA_HORKAGE_NODMA }, /* temporary fix */
3747 { "IOMEGA ZIP 250 ATAPI Floppy",
3748 NULL, ATA_HORKAGE_NODMA },
3750 /* Weird ATAPI devices */
3751 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
3753 /* Devices we expect to fail diagnostics */
3755 /* Devices where NCQ should be avoided */
3757 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
3758 /* http://thread.gmane.org/gmane.linux.ide/14907 */
3759 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ },
3761 { "Maxtor 6L250S0", "BANC1G10", ATA_HORKAGE_NONCQ },
3762 { "Maxtor 6B200M0", "BANC1BM0", ATA_HORKAGE_NONCQ },
3763 { "Maxtor 6B200M0", "BANC1B10", ATA_HORKAGE_NONCQ },
3764 { "HITACHI HDS7250SASUN500G 0621KTAWSD", "K2AOAJ0AHITACHI",
3765 ATA_HORKAGE_NONCQ },
3766 /* NCQ hard hangs device under heavier load, needs hard power cycle */
3767 { "Maxtor 6B250S0", "BANC1B70", ATA_HORKAGE_NONCQ },
3768 /* Blacklist entries taken from Silicon Image 3124/3132
3769 Windows driver .inf file - also several Linux problem reports */
3770 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, },
3771 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, },
3772 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, },
3773 /* Drives which do spurious command completion */
3774 { "HTS541680J9SA00", "SB2IC7EP", ATA_HORKAGE_NONCQ, },
3775 { "HTS541612J9SA00", "SBDIC7JP", ATA_HORKAGE_NONCQ, },
3776 { "Hitachi HTS541616J9SA00", "SB4OC70P", ATA_HORKAGE_NONCQ, },
3777 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, },
3778 { "FUJITSU MHV2080BH", "00840028", ATA_HORKAGE_NONCQ, },
3780 /* Devices with NCQ limits */
3786 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
3788 unsigned char model_num[ATA_ID_PROD_LEN + 1];
3789 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3790 const struct ata_blacklist_entry *ad = ata_device_blacklist;
3792 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
3793 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
3795 while (ad->model_num) {
3796 if (!strcmp(ad->model_num, model_num)) {
3797 if (ad->model_rev == NULL)
3799 if (!strcmp(ad->model_rev, model_rev))
3807 static int ata_dma_blacklisted(const struct ata_device *dev)
3809 /* We don't support polling DMA.
3810 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
3811 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
3813 if ((dev->ap->flags & ATA_FLAG_PIO_POLLING) &&
3814 (dev->flags & ATA_DFLAG_CDB_INTR))
3816 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
3820 * ata_dev_xfermask - Compute supported xfermask of the given device
3821 * @dev: Device to compute xfermask for
3823 * Compute supported xfermask of @dev and store it in
3824 * dev->*_mask. This function is responsible for applying all
3825 * known limits including host controller limits, device
3831 static void ata_dev_xfermask(struct ata_device *dev)
3833 struct ata_port *ap = dev->ap;
3834 struct ata_host *host = ap->host;
3835 unsigned long xfer_mask;
3837 /* controller modes available */
3838 xfer_mask = ata_pack_xfermask(ap->pio_mask,
3839 ap->mwdma_mask, ap->udma_mask);
3841 /* drive modes available */
3842 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
3843 dev->mwdma_mask, dev->udma_mask);
3844 xfer_mask &= ata_id_xfermask(dev->id);
3847 * CFA Advanced TrueIDE timings are not allowed on a shared
3850 if (ata_dev_pair(dev)) {
3851 /* No PIO5 or PIO6 */
3852 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
3853 /* No MWDMA3 or MWDMA 4 */
3854 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
3857 if (ata_dma_blacklisted(dev)) {
3858 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3859 ata_dev_printk(dev, KERN_WARNING,
3860 "device is on DMA blacklist, disabling DMA\n");
3863 if ((host->flags & ATA_HOST_SIMPLEX) &&
3864 host->simplex_claimed && host->simplex_claimed != ap) {
3865 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3866 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
3867 "other device, disabling DMA\n");
3870 if (ap->flags & ATA_FLAG_NO_IORDY)
3871 xfer_mask &= ata_pio_mask_no_iordy(dev);
3873 if (ap->ops->mode_filter)
3874 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
3876 /* Apply cable rule here. Don't apply it early because when
3877 * we handle hot plug the cable type can itself change.
3878 * Check this last so that we know if the transfer rate was
3879 * solely limited by the cable.
3880 * Unknown or 80 wire cables reported host side are checked
3881 * drive side as well. Cases where we know a 40wire cable
3882 * is used safely for 80 are not checked here.
3884 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
3885 /* UDMA/44 or higher would be available */
3886 if((ap->cbl == ATA_CBL_PATA40) ||
3887 (ata_drive_40wire(dev->id) &&
3888 (ap->cbl == ATA_CBL_PATA_UNK ||
3889 ap->cbl == ATA_CBL_PATA80))) {
3890 ata_dev_printk(dev, KERN_WARNING,
3891 "limited to UDMA/33 due to 40-wire cable\n");
3892 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
3895 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
3896 &dev->mwdma_mask, &dev->udma_mask);
3900 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3901 * @dev: Device to which command will be sent
3903 * Issue SET FEATURES - XFER MODE command to device @dev
3907 * PCI/etc. bus probe sem.
3910 * 0 on success, AC_ERR_* mask otherwise.
3913 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
3915 struct ata_taskfile tf;
3916 unsigned int err_mask;
3918 /* set up set-features taskfile */
3919 DPRINTK("set features - xfer mode\n");
3921 /* Some controllers and ATAPI devices show flaky interrupt
3922 * behavior after setting xfer mode. Use polling instead.
3924 ata_tf_init(dev, &tf);
3925 tf.command = ATA_CMD_SET_FEATURES;
3926 tf.feature = SETFEATURES_XFER;
3927 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
3928 tf.protocol = ATA_PROT_NODATA;
3929 tf.nsect = dev->xfer_mode;
3931 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3933 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3938 * ata_dev_init_params - Issue INIT DEV PARAMS command
3939 * @dev: Device to which command will be sent
3940 * @heads: Number of heads (taskfile parameter)
3941 * @sectors: Number of sectors (taskfile parameter)
3944 * Kernel thread context (may sleep)
3947 * 0 on success, AC_ERR_* mask otherwise.
3949 static unsigned int ata_dev_init_params(struct ata_device *dev,
3950 u16 heads, u16 sectors)
3952 struct ata_taskfile tf;
3953 unsigned int err_mask;
3955 /* Number of sectors per track 1-255. Number of heads 1-16 */
3956 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3957 return AC_ERR_INVALID;
3959 /* set up init dev params taskfile */
3960 DPRINTK("init dev params \n");
3962 ata_tf_init(dev, &tf);
3963 tf.command = ATA_CMD_INIT_DEV_PARAMS;
3964 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3965 tf.protocol = ATA_PROT_NODATA;
3967 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
3969 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3971 DPRINTK("EXIT, err_mask=%x\n", err_mask);
3976 * ata_sg_clean - Unmap DMA memory associated with command
3977 * @qc: Command containing DMA memory to be released
3979 * Unmap all mapped DMA memory associated with this command.
3982 * spin_lock_irqsave(host lock)
3984 void ata_sg_clean(struct ata_queued_cmd *qc)
3986 struct ata_port *ap = qc->ap;
3987 struct scatterlist *sg = qc->__sg;
3988 int dir = qc->dma_dir;
3989 void *pad_buf = NULL;
3991 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
3992 WARN_ON(sg == NULL);
3994 if (qc->flags & ATA_QCFLAG_SINGLE)
3995 WARN_ON(qc->n_elem > 1);
3997 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
3999 /* if we padded the buffer out to 32-bit bound, and data
4000 * xfer direction is from-device, we must copy from the
4001 * pad buffer back into the supplied buffer
4003 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
4004 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4006 if (qc->flags & ATA_QCFLAG_SG) {
4008 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4009 /* restore last sg */
4010 sg[qc->orig_n_elem - 1].length += qc->pad_len;
4012 struct scatterlist *psg = &qc->pad_sgent;
4013 void *addr = kmap_atomic(psg->page, KM_IRQ0);
4014 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
4015 kunmap_atomic(addr, KM_IRQ0);
4019 dma_unmap_single(ap->dev,
4020 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
4023 sg->length += qc->pad_len;
4025 memcpy(qc->buf_virt + sg->length - qc->pad_len,
4026 pad_buf, qc->pad_len);
4029 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4034 * ata_fill_sg - Fill PCI IDE PRD table
4035 * @qc: Metadata associated with taskfile to be transferred
4037 * Fill PCI IDE PRD (scatter-gather) table with segments
4038 * associated with the current disk command.
4041 * spin_lock_irqsave(host lock)
4044 static void ata_fill_sg(struct ata_queued_cmd *qc)
4046 struct ata_port *ap = qc->ap;
4047 struct scatterlist *sg;
4050 WARN_ON(qc->__sg == NULL);
4051 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
4054 ata_for_each_sg(sg, qc) {
4058 /* determine if physical DMA addr spans 64K boundary.
4059 * Note h/w doesn't support 64-bit, so we unconditionally
4060 * truncate dma_addr_t to u32.
4062 addr = (u32) sg_dma_address(sg);
4063 sg_len = sg_dma_len(sg);
4066 offset = addr & 0xffff;
4068 if ((offset + sg_len) > 0x10000)
4069 len = 0x10000 - offset;
4071 ap->prd[idx].addr = cpu_to_le32(addr);
4072 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
4073 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
4082 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
4086 * ata_fill_sg_dumb - Fill PCI IDE PRD table
4087 * @qc: Metadata associated with taskfile to be transferred
4089 * Fill PCI IDE PRD (scatter-gather) table with segments
4090 * associated with the current disk command. Perform the fill
4091 * so that we avoid writing any length 64K records for
4092 * controllers that don't follow the spec.
4095 * spin_lock_irqsave(host lock)
4098 static void ata_fill_sg_dumb(struct ata_queued_cmd *qc)
4100 struct ata_port *ap = qc->ap;
4101 struct scatterlist *sg;
4104 WARN_ON(qc->__sg == NULL);
4105 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
4108 ata_for_each_sg(sg, qc) {
4110 u32 sg_len, len, blen;
4112 /* determine if physical DMA addr spans 64K boundary.
4113 * Note h/w doesn't support 64-bit, so we unconditionally
4114 * truncate dma_addr_t to u32.
4116 addr = (u32) sg_dma_address(sg);
4117 sg_len = sg_dma_len(sg);
4120 offset = addr & 0xffff;
4122 if ((offset + sg_len) > 0x10000)
4123 len = 0x10000 - offset;
4125 blen = len & 0xffff;
4126 ap->prd[idx].addr = cpu_to_le32(addr);
4128 /* Some PATA chipsets like the CS5530 can't
4129 cope with 0x0000 meaning 64K as the spec says */
4130 ap->prd[idx].flags_len = cpu_to_le32(0x8000);
4132 ap->prd[++idx].addr = cpu_to_le32(addr + 0x8000);
4134 ap->prd[idx].flags_len = cpu_to_le32(blen);
4135 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
4144 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
4148 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
4149 * @qc: Metadata associated with taskfile to check
4151 * Allow low-level driver to filter ATA PACKET commands, returning
4152 * a status indicating whether or not it is OK to use DMA for the
4153 * supplied PACKET command.
4156 * spin_lock_irqsave(host lock)
4158 * RETURNS: 0 when ATAPI DMA can be used
4161 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
4163 struct ata_port *ap = qc->ap;
4165 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a
4166 * few ATAPI devices choke on such DMA requests.
4168 if (unlikely(qc->nbytes & 15))
4171 if (ap->ops->check_atapi_dma)
4172 return ap->ops->check_atapi_dma(qc);
4178 * ata_qc_prep - Prepare taskfile for submission
4179 * @qc: Metadata associated with taskfile to be prepared
4181 * Prepare ATA taskfile for submission.
4184 * spin_lock_irqsave(host lock)
4186 void ata_qc_prep(struct ata_queued_cmd *qc)
4188 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
4195 * ata_dumb_qc_prep - Prepare taskfile for submission
4196 * @qc: Metadata associated with taskfile to be prepared
4198 * Prepare ATA taskfile for submission.
4201 * spin_lock_irqsave(host lock)
4203 void ata_dumb_qc_prep(struct ata_queued_cmd *qc)
4205 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
4208 ata_fill_sg_dumb(qc);
4211 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4214 * ata_sg_init_one - Associate command with memory buffer
4215 * @qc: Command to be associated
4216 * @buf: Memory buffer
4217 * @buflen: Length of memory buffer, in bytes.
4219 * Initialize the data-related elements of queued_cmd @qc
4220 * to point to a single memory buffer, @buf of byte length @buflen.
4223 * spin_lock_irqsave(host lock)
4226 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
4228 qc->flags |= ATA_QCFLAG_SINGLE;
4230 qc->__sg = &qc->sgent;
4232 qc->orig_n_elem = 1;
4234 qc->nbytes = buflen;
4236 sg_init_one(&qc->sgent, buf, buflen);
4240 * ata_sg_init - Associate command with scatter-gather table.
4241 * @qc: Command to be associated
4242 * @sg: Scatter-gather table.
4243 * @n_elem: Number of elements in s/g table.
4245 * Initialize the data-related elements of queued_cmd @qc
4246 * to point to a scatter-gather table @sg, containing @n_elem
4250 * spin_lock_irqsave(host lock)
4253 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4254 unsigned int n_elem)
4256 qc->flags |= ATA_QCFLAG_SG;
4258 qc->n_elem = n_elem;
4259 qc->orig_n_elem = n_elem;
4263 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
4264 * @qc: Command with memory buffer to be mapped.
4266 * DMA-map the memory buffer associated with queued_cmd @qc.
4269 * spin_lock_irqsave(host lock)
4272 * Zero on success, negative on error.
4275 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
4277 struct ata_port *ap = qc->ap;
4278 int dir = qc->dma_dir;
4279 struct scatterlist *sg = qc->__sg;
4280 dma_addr_t dma_address;
4283 /* we must lengthen transfers to end on a 32-bit boundary */
4284 qc->pad_len = sg->length & 3;
4286 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4287 struct scatterlist *psg = &qc->pad_sgent;
4289 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4291 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
4293 if (qc->tf.flags & ATA_TFLAG_WRITE)
4294 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
4297 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
4298 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
4300 sg->length -= qc->pad_len;
4301 if (sg->length == 0)
4304 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
4305 sg->length, qc->pad_len);
4313 dma_address = dma_map_single(ap->dev, qc->buf_virt,
4315 if (dma_mapping_error(dma_address)) {
4317 sg->length += qc->pad_len;
4321 sg_dma_address(sg) = dma_address;
4322 sg_dma_len(sg) = sg->length;
4325 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
4326 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4332 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
4333 * @qc: Command with scatter-gather table to be mapped.
4335 * DMA-map the scatter-gather table associated with queued_cmd @qc.
4338 * spin_lock_irqsave(host lock)
4341 * Zero on success, negative on error.
4345 static int ata_sg_setup(struct ata_queued_cmd *qc)
4347 struct ata_port *ap = qc->ap;
4348 struct scatterlist *sg = qc->__sg;
4349 struct scatterlist *lsg = &sg[qc->n_elem - 1];
4350 int n_elem, pre_n_elem, dir, trim_sg = 0;
4352 VPRINTK("ENTER, ata%u\n", ap->print_id);
4353 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
4355 /* we must lengthen transfers to end on a 32-bit boundary */
4356 qc->pad_len = lsg->length & 3;
4358 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4359 struct scatterlist *psg = &qc->pad_sgent;
4360 unsigned int offset;
4362 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4364 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
4367 * psg->page/offset are used to copy to-be-written
4368 * data in this function or read data in ata_sg_clean.
4370 offset = lsg->offset + lsg->length - qc->pad_len;
4371 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
4372 psg->offset = offset_in_page(offset);
4374 if (qc->tf.flags & ATA_TFLAG_WRITE) {
4375 void *addr = kmap_atomic(psg->page, KM_IRQ0);
4376 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
4377 kunmap_atomic(addr, KM_IRQ0);
4380 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
4381 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
4383 lsg->length -= qc->pad_len;
4384 if (lsg->length == 0)
4387 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
4388 qc->n_elem - 1, lsg->length, qc->pad_len);
4391 pre_n_elem = qc->n_elem;
4392 if (trim_sg && pre_n_elem)
4401 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4403 /* restore last sg */
4404 lsg->length += qc->pad_len;
4408 DPRINTK("%d sg elements mapped\n", n_elem);
4411 qc->n_elem = n_elem;
4417 * swap_buf_le16 - swap halves of 16-bit words in place
4418 * @buf: Buffer to swap
4419 * @buf_words: Number of 16-bit words in buffer.
4421 * Swap halves of 16-bit words if needed to convert from
4422 * little-endian byte order to native cpu byte order, or
4426 * Inherited from caller.
4428 void swap_buf_le16(u16 *buf, unsigned int buf_words)
4433 for (i = 0; i < buf_words; i++)
4434 buf[i] = le16_to_cpu(buf[i]);
4435 #endif /* __BIG_ENDIAN */
4439 * ata_data_xfer - Transfer data by PIO
4440 * @adev: device to target
4442 * @buflen: buffer length
4443 * @write_data: read/write
4445 * Transfer data from/to the device data register by PIO.
4448 * Inherited from caller.
4450 void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
4451 unsigned int buflen, int write_data)
4453 struct ata_port *ap = adev->ap;
4454 unsigned int words = buflen >> 1;
4456 /* Transfer multiple of 2 bytes */
4458 iowrite16_rep(ap->ioaddr.data_addr, buf, words);
4460 ioread16_rep(ap->ioaddr.data_addr, buf, words);
4462 /* Transfer trailing 1 byte, if any. */
4463 if (unlikely(buflen & 0x01)) {
4464 u16 align_buf[1] = { 0 };
4465 unsigned char *trailing_buf = buf + buflen - 1;
4468 memcpy(align_buf, trailing_buf, 1);
4469 iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
4471 align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
4472 memcpy(trailing_buf, align_buf, 1);
4478 * ata_data_xfer_noirq - Transfer data by PIO
4479 * @adev: device to target
4481 * @buflen: buffer length
4482 * @write_data: read/write
4484 * Transfer data from/to the device data register by PIO. Do the
4485 * transfer with interrupts disabled.
4488 * Inherited from caller.
4490 void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
4491 unsigned int buflen, int write_data)
4493 unsigned long flags;
4494 local_irq_save(flags);
4495 ata_data_xfer(adev, buf, buflen, write_data);
4496 local_irq_restore(flags);
4501 * ata_pio_sector - Transfer a sector of data.
4502 * @qc: Command on going
4504 * Transfer qc->sect_size bytes of data from/to the ATA device.
4507 * Inherited from caller.
4510 static void ata_pio_sector(struct ata_queued_cmd *qc)
4512 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4513 struct scatterlist *sg = qc->__sg;
4514 struct ata_port *ap = qc->ap;
4516 unsigned int offset;
4519 if (qc->curbytes == qc->nbytes - qc->sect_size)
4520 ap->hsm_task_state = HSM_ST_LAST;
4522 page = sg[qc->cursg].page;
4523 offset = sg[qc->cursg].offset + qc->cursg_ofs;
4525 /* get the current page and offset */
4526 page = nth_page(page, (offset >> PAGE_SHIFT));
4527 offset %= PAGE_SIZE;
4529 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4531 if (PageHighMem(page)) {
4532 unsigned long flags;
4534 /* FIXME: use a bounce buffer */
4535 local_irq_save(flags);
4536 buf = kmap_atomic(page, KM_IRQ0);
4538 /* do the actual data transfer */
4539 ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4541 kunmap_atomic(buf, KM_IRQ0);
4542 local_irq_restore(flags);
4544 buf = page_address(page);
4545 ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4548 qc->curbytes += qc->sect_size;
4549 qc->cursg_ofs += qc->sect_size;
4551 if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
4558 * ata_pio_sectors - Transfer one or many sectors.
4559 * @qc: Command on going
4561 * Transfer one or many sectors of data from/to the
4562 * ATA device for the DRQ request.
4565 * Inherited from caller.
4568 static void ata_pio_sectors(struct ata_queued_cmd *qc)
4570 if (is_multi_taskfile(&qc->tf)) {
4571 /* READ/WRITE MULTIPLE */
4574 WARN_ON(qc->dev->multi_count == 0);
4576 nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
4577 qc->dev->multi_count);
4585 * atapi_send_cdb - Write CDB bytes to hardware
4586 * @ap: Port to which ATAPI device is attached.
4587 * @qc: Taskfile currently active
4589 * When device has indicated its readiness to accept
4590 * a CDB, this function is called. Send the CDB.
4596 static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
4599 DPRINTK("send cdb\n");
4600 WARN_ON(qc->dev->cdb_len < 12);
4602 ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4603 ata_altstatus(ap); /* flush */
4605 switch (qc->tf.protocol) {
4606 case ATA_PROT_ATAPI:
4607 ap->hsm_task_state = HSM_ST;
4609 case ATA_PROT_ATAPI_NODATA:
4610 ap->hsm_task_state = HSM_ST_LAST;
4612 case ATA_PROT_ATAPI_DMA:
4613 ap->hsm_task_state = HSM_ST_LAST;
4614 /* initiate bmdma */
4615 ap->ops->bmdma_start(qc);
4621 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
4622 * @qc: Command on going
4623 * @bytes: number of bytes
4625 * Transfer Transfer data from/to the ATAPI device.
4628 * Inherited from caller.
4632 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
4634 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4635 struct scatterlist *sg = qc->__sg;
4636 struct ata_port *ap = qc->ap;
4639 unsigned int offset, count;
4641 if (qc->curbytes + bytes >= qc->nbytes)
4642 ap->hsm_task_state = HSM_ST_LAST;
4645 if (unlikely(qc->cursg >= qc->n_elem)) {
4647 * The end of qc->sg is reached and the device expects
4648 * more data to transfer. In order not to overrun qc->sg
4649 * and fulfill length specified in the byte count register,
4650 * - for read case, discard trailing data from the device
4651 * - for write case, padding zero data to the device
4653 u16 pad_buf[1] = { 0 };
4654 unsigned int words = bytes >> 1;
4657 if (words) /* warning if bytes > 1 */
4658 ata_dev_printk(qc->dev, KERN_WARNING,
4659 "%u bytes trailing data\n", bytes);
4661 for (i = 0; i < words; i++)
4662 ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4664 ap->hsm_task_state = HSM_ST_LAST;
4668 sg = &qc->__sg[qc->cursg];
4671 offset = sg->offset + qc->cursg_ofs;
4673 /* get the current page and offset */
4674 page = nth_page(page, (offset >> PAGE_SHIFT));
4675 offset %= PAGE_SIZE;
4677 /* don't overrun current sg */
4678 count = min(sg->length - qc->cursg_ofs, bytes);
4680 /* don't cross page boundaries */
4681 count = min(count, (unsigned int)PAGE_SIZE - offset);
4683 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4685 if (PageHighMem(page)) {
4686 unsigned long flags;
4688 /* FIXME: use bounce buffer */
4689 local_irq_save(flags);
4690 buf = kmap_atomic(page, KM_IRQ0);
4692 /* do the actual data transfer */
4693 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
4695 kunmap_atomic(buf, KM_IRQ0);
4696 local_irq_restore(flags);
4698 buf = page_address(page);
4699 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
4703 qc->curbytes += count;
4704 qc->cursg_ofs += count;
4706 if (qc->cursg_ofs == sg->length) {
4716 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
4717 * @qc: Command on going
4719 * Transfer Transfer data from/to the ATAPI device.
4722 * Inherited from caller.
4725 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
4727 struct ata_port *ap = qc->ap;
4728 struct ata_device *dev = qc->dev;
4729 unsigned int ireason, bc_lo, bc_hi, bytes;
4730 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
4732 /* Abuse qc->result_tf for temp storage of intermediate TF
4733 * here to save some kernel stack usage.
4734 * For normal completion, qc->result_tf is not relevant. For
4735 * error, qc->result_tf is later overwritten by ata_qc_complete().
4736 * So, the correctness of qc->result_tf is not affected.
4738 ap->ops->tf_read(ap, &qc->result_tf);
4739 ireason = qc->result_tf.nsect;
4740 bc_lo = qc->result_tf.lbam;
4741 bc_hi = qc->result_tf.lbah;
4742 bytes = (bc_hi << 8) | bc_lo;
4744 /* shall be cleared to zero, indicating xfer of data */
4745 if (ireason & (1 << 0))
4748 /* make sure transfer direction matches expected */
4749 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
4750 if (do_write != i_write)
4753 VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4755 __atapi_pio_bytes(qc, bytes);
4760 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4761 qc->err_mask |= AC_ERR_HSM;
4762 ap->hsm_task_state = HSM_ST_ERR;
4766 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
4767 * @ap: the target ata_port
4771 * 1 if ok in workqueue, 0 otherwise.
4774 static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
4776 if (qc->tf.flags & ATA_TFLAG_POLLING)
4779 if (ap->hsm_task_state == HSM_ST_FIRST) {
4780 if (qc->tf.protocol == ATA_PROT_PIO &&
4781 (qc->tf.flags & ATA_TFLAG_WRITE))
4784 if (is_atapi_taskfile(&qc->tf) &&
4785 !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4793 * ata_hsm_qc_complete - finish a qc running on standard HSM
4794 * @qc: Command to complete
4795 * @in_wq: 1 if called from workqueue, 0 otherwise
4797 * Finish @qc which is running on standard HSM.
4800 * If @in_wq is zero, spin_lock_irqsave(host lock).
4801 * Otherwise, none on entry and grabs host lock.
4803 static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
4805 struct ata_port *ap = qc->ap;
4806 unsigned long flags;
4808 if (ap->ops->error_handler) {
4810 spin_lock_irqsave(ap->lock, flags);
4812 /* EH might have kicked in while host lock is
4815 qc = ata_qc_from_tag(ap, qc->tag);
4817 if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4818 ap->ops->irq_on(ap);
4819 ata_qc_complete(qc);
4821 ata_port_freeze(ap);
4824 spin_unlock_irqrestore(ap->lock, flags);
4826 if (likely(!(qc->err_mask & AC_ERR_HSM)))
4827 ata_qc_complete(qc);
4829 ata_port_freeze(ap);
4833 spin_lock_irqsave(ap->lock, flags);
4834 ap->ops->irq_on(ap);
4835 ata_qc_complete(qc);
4836 spin_unlock_irqrestore(ap->lock, flags);
4838 ata_qc_complete(qc);
4843 * ata_hsm_move - move the HSM to the next state.
4844 * @ap: the target ata_port
4846 * @status: current device status
4847 * @in_wq: 1 if called from workqueue, 0 otherwise
4850 * 1 when poll next status needed, 0 otherwise.
4852 int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
4853 u8 status, int in_wq)
4855 unsigned long flags = 0;
4858 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
4860 /* Make sure ata_qc_issue_prot() does not throw things
4861 * like DMA polling into the workqueue. Notice that
4862 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
4864 WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4867 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4868 ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4870 switch (ap->hsm_task_state) {
4872 /* Send first data block or PACKET CDB */
4874 /* If polling, we will stay in the work queue after
4875 * sending the data. Otherwise, interrupt handler
4876 * takes over after sending the data.
4878 poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
4880 /* check device status */
4881 if (unlikely((status & ATA_DRQ) == 0)) {
4882 /* handle BSY=0, DRQ=0 as error */
4883 if (likely(status & (ATA_ERR | ATA_DF)))
4884 /* device stops HSM for abort/error */
4885 qc->err_mask |= AC_ERR_DEV;
4887 /* HSM violation. Let EH handle this */
4888 qc->err_mask |= AC_ERR_HSM;
4890 ap->hsm_task_state = HSM_ST_ERR;
4894 /* Device should not ask for data transfer (DRQ=1)
4895 * when it finds something wrong.
4896 * We ignore DRQ here and stop the HSM by
4897 * changing hsm_task_state to HSM_ST_ERR and
4898 * let the EH abort the command or reset the device.
4900 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4901 ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
4902 "error, dev_stat 0x%X\n", status);
4903 qc->err_mask |= AC_ERR_HSM;
4904 ap->hsm_task_state = HSM_ST_ERR;
4908 /* Send the CDB (atapi) or the first data block (ata pio out).
4909 * During the state transition, interrupt handler shouldn't
4910 * be invoked before the data transfer is complete and
4911 * hsm_task_state is changed. Hence, the following locking.
4914 spin_lock_irqsave(ap->lock, flags);
4916 if (qc->tf.protocol == ATA_PROT_PIO) {
4917 /* PIO data out protocol.
4918 * send first data block.
4921 /* ata_pio_sectors() might change the state
4922 * to HSM_ST_LAST. so, the state is changed here
4923 * before ata_pio_sectors().
4925 ap->hsm_task_state = HSM_ST;
4926 ata_pio_sectors(qc);
4927 ata_altstatus(ap); /* flush */
4930 atapi_send_cdb(ap, qc);
4933 spin_unlock_irqrestore(ap->lock, flags);
4935 /* if polling, ata_pio_task() handles the rest.
4936 * otherwise, interrupt handler takes over from here.
4941 /* complete command or read/write the data register */
4942 if (qc->tf.protocol == ATA_PROT_ATAPI) {
4943 /* ATAPI PIO protocol */
4944 if ((status & ATA_DRQ) == 0) {
4945 /* No more data to transfer or device error.
4946 * Device error will be tagged in HSM_ST_LAST.
4948 ap->hsm_task_state = HSM_ST_LAST;
4952 /* Device should not ask for data transfer (DRQ=1)
4953 * when it finds something wrong.
4954 * We ignore DRQ here and stop the HSM by
4955 * changing hsm_task_state to HSM_ST_ERR and
4956 * let the EH abort the command or reset the device.
4958 if (unlikely(status & (ATA_ERR | ATA_DF))) {
4959 ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
4960 "device error, dev_stat 0x%X\n",
4962 qc->err_mask |= AC_ERR_HSM;
4963 ap->hsm_task_state = HSM_ST_ERR;
4967 atapi_pio_bytes(qc);
4969 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
4970 /* bad ireason reported by device */
4974 /* ATA PIO protocol */
4975 if (unlikely((status & ATA_DRQ) == 0)) {
4976 /* handle BSY=0, DRQ=0 as error */
4977 if (likely(status & (ATA_ERR | ATA_DF)))
4978 /* device stops HSM for abort/error */
4979 qc->err_mask |= AC_ERR_DEV;
4981 /* HSM violation. Let EH handle this.
4982 * Phantom devices also trigger this
4983 * condition. Mark hint.
4985 qc->err_mask |= AC_ERR_HSM |
4988 ap->hsm_task_state = HSM_ST_ERR;
4992 /* For PIO reads, some devices may ask for
4993 * data transfer (DRQ=1) alone with ERR=1.
4994 * We respect DRQ here and transfer one
4995 * block of junk data before changing the
4996 * hsm_task_state to HSM_ST_ERR.
4998 * For PIO writes, ERR=1 DRQ=1 doesn't make
4999 * sense since the data block has been
5000 * transferred to the device.
5002 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5003 /* data might be corrputed */
5004 qc->err_mask |= AC_ERR_DEV;
5006 if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
5007 ata_pio_sectors(qc);
5009 status = ata_wait_idle(ap);
5012 if (status & (ATA_BUSY | ATA_DRQ))
5013 qc->err_mask |= AC_ERR_HSM;
5015 /* ata_pio_sectors() might change the
5016 * state to HSM_ST_LAST. so, the state
5017 * is changed after ata_pio_sectors().
5019 ap->hsm_task_state = HSM_ST_ERR;
5023 ata_pio_sectors(qc);
5025 if (ap->hsm_task_state == HSM_ST_LAST &&
5026 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
5029 status = ata_wait_idle(ap);
5034 ata_altstatus(ap); /* flush */
5039 if (unlikely(!ata_ok(status))) {
5040 qc->err_mask |= __ac_err_mask(status);
5041 ap->hsm_task_state = HSM_ST_ERR;
5045 /* no more data to transfer */
5046 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
5047 ap->print_id, qc->dev->devno, status);
5049 WARN_ON(qc->err_mask);
5051 ap->hsm_task_state = HSM_ST_IDLE;
5053 /* complete taskfile transaction */
5054 ata_hsm_qc_complete(qc, in_wq);
5060 /* make sure qc->err_mask is available to
5061 * know what's wrong and recover
5063 WARN_ON(qc->err_mask == 0);
5065 ap->hsm_task_state = HSM_ST_IDLE;
5067 /* complete taskfile transaction */
5068 ata_hsm_qc_complete(qc, in_wq);
5080 static void ata_pio_task(struct work_struct *work)
5082 struct ata_port *ap =
5083 container_of(work, struct ata_port, port_task.work);
5084 struct ata_queued_cmd *qc = ap->port_task_data;
5089 WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5092 * This is purely heuristic. This is a fast path.
5093 * Sometimes when we enter, BSY will be cleared in
5094 * a chk-status or two. If not, the drive is probably seeking
5095 * or something. Snooze for a couple msecs, then
5096 * chk-status again. If still busy, queue delayed work.
5098 status = ata_busy_wait(ap, ATA_BUSY, 5);
5099 if (status & ATA_BUSY) {
5101 status = ata_busy_wait(ap, ATA_BUSY, 10);
5102 if (status & ATA_BUSY) {
5103 ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5109 poll_next = ata_hsm_move(ap, qc, status, 1);
5111 /* another command or interrupt handler
5112 * may be running at this point.
5119 * ata_qc_new - Request an available ATA command, for queueing
5120 * @ap: Port associated with device @dev
5121 * @dev: Device from whom we request an available command structure
5127 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
5129 struct ata_queued_cmd *qc = NULL;
5132 /* no command while frozen */
5133 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5136 /* the last tag is reserved for internal command. */
5137 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5138 if (!test_and_set_bit(i, &ap->qc_allocated)) {
5139 qc = __ata_qc_from_tag(ap, i);
5150 * ata_qc_new_init - Request an available ATA command, and initialize it
5151 * @dev: Device from whom we request an available command structure
5157 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
5159 struct ata_port *ap = dev->ap;
5160 struct ata_queued_cmd *qc;
5162 qc = ata_qc_new(ap);
5175 * ata_qc_free - free unused ata_queued_cmd
5176 * @qc: Command to complete
5178 * Designed to free unused ata_queued_cmd object
5179 * in case something prevents using it.
5182 * spin_lock_irqsave(host lock)
5184 void ata_qc_free(struct ata_queued_cmd *qc)
5186 struct ata_port *ap = qc->ap;
5189 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5193 if (likely(ata_tag_valid(tag))) {
5194 qc->tag = ATA_TAG_POISON;
5195 clear_bit(tag, &ap->qc_allocated);
5199 void __ata_qc_complete(struct ata_queued_cmd *qc)
5201 struct ata_port *ap = qc->ap;
5203 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5204 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
5206 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
5209 /* command should be marked inactive atomically with qc completion */
5210 if (qc->tf.protocol == ATA_PROT_NCQ)
5211 ap->sactive &= ~(1 << qc->tag);
5213 ap->active_tag = ATA_TAG_POISON;
5215 /* atapi: mark qc as inactive to prevent the interrupt handler
5216 * from completing the command twice later, before the error handler
5217 * is called. (when rc != 0 and atapi request sense is needed)
5219 qc->flags &= ~ATA_QCFLAG_ACTIVE;
5220 ap->qc_active &= ~(1 << qc->tag);
5222 /* call completion callback */
5223 qc->complete_fn(qc);
5226 static void fill_result_tf(struct ata_queued_cmd *qc)
5228 struct ata_port *ap = qc->ap;
5230 qc->result_tf.flags = qc->tf.flags;
5231 ap->ops->tf_read(ap, &qc->result_tf);
5235 * ata_qc_complete - Complete an active ATA command
5236 * @qc: Command to complete
5237 * @err_mask: ATA Status register contents
5239 * Indicate to the mid and upper layers that an ATA
5240 * command has completed, with either an ok or not-ok status.
5243 * spin_lock_irqsave(host lock)
5245 void ata_qc_complete(struct ata_queued_cmd *qc)
5247 struct ata_port *ap = qc->ap;
5249 /* XXX: New EH and old EH use different mechanisms to
5250 * synchronize EH with regular execution path.
5252 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
5253 * Normal execution path is responsible for not accessing a
5254 * failed qc. libata core enforces the rule by returning NULL
5255 * from ata_qc_from_tag() for failed qcs.
5257 * Old EH depends on ata_qc_complete() nullifying completion
5258 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
5259 * not synchronize with interrupt handler. Only PIO task is
5262 if (ap->ops->error_handler) {
5263 WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5265 if (unlikely(qc->err_mask))
5266 qc->flags |= ATA_QCFLAG_FAILED;
5268 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
5269 if (!ata_tag_internal(qc->tag)) {
5270 /* always fill result TF for failed qc */
5272 ata_qc_schedule_eh(qc);
5277 /* read result TF if requested */
5278 if (qc->flags & ATA_QCFLAG_RESULT_TF)
5281 __ata_qc_complete(qc);
5283 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
5286 /* read result TF if failed or requested */
5287 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
5290 __ata_qc_complete(qc);
5295 * ata_qc_complete_multiple - Complete multiple qcs successfully
5296 * @ap: port in question
5297 * @qc_active: new qc_active mask
5298 * @finish_qc: LLDD callback invoked before completing a qc
5300 * Complete in-flight commands. This functions is meant to be
5301 * called from low-level driver's interrupt routine to complete
5302 * requests normally. ap->qc_active and @qc_active is compared
5303 * and commands are completed accordingly.
5306 * spin_lock_irqsave(host lock)
5309 * Number of completed commands on success, -errno otherwise.
5311 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
5312 void (*finish_qc)(struct ata_queued_cmd *))
5318 done_mask = ap->qc_active ^ qc_active;
5320 if (unlikely(done_mask & qc_active)) {
5321 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
5322 "(%08x->%08x)\n", ap->qc_active, qc_active);
5326 for (i = 0; i < ATA_MAX_QUEUE; i++) {
5327 struct ata_queued_cmd *qc;
5329 if (!(done_mask & (1 << i)))
5332 if ((qc = ata_qc_from_tag(ap, i))) {
5335 ata_qc_complete(qc);
5343 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
5345 struct ata_port *ap = qc->ap;
5347 switch (qc->tf.protocol) {
5350 case ATA_PROT_ATAPI_DMA:
5353 case ATA_PROT_ATAPI:
5355 if (ap->flags & ATA_FLAG_PIO_DMA)
5368 * ata_qc_issue - issue taskfile to device
5369 * @qc: command to issue to device
5371 * Prepare an ATA command to submission to device.
5372 * This includes mapping the data into a DMA-able
5373 * area, filling in the S/G table, and finally
5374 * writing the taskfile to hardware, starting the command.
5377 * spin_lock_irqsave(host lock)
5379 void ata_qc_issue(struct ata_queued_cmd *qc)
5381 struct ata_port *ap = qc->ap;
5383 /* Make sure only one non-NCQ command is outstanding. The
5384 * check is skipped for old EH because it reuses active qc to
5385 * request ATAPI sense.
5387 WARN_ON(ap->ops->error_handler && ata_tag_valid(ap->active_tag));
5389 if (qc->tf.protocol == ATA_PROT_NCQ) {
5390 WARN_ON(ap->sactive & (1 << qc->tag));
5391 ap->sactive |= 1 << qc->tag;
5393 WARN_ON(ap->sactive);
5394 ap->active_tag = qc->tag;
5397 qc->flags |= ATA_QCFLAG_ACTIVE;
5398 ap->qc_active |= 1 << qc->tag;
5400 if (ata_should_dma_map(qc)) {
5401 if (qc->flags & ATA_QCFLAG_SG) {
5402 if (ata_sg_setup(qc))
5404 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
5405 if (ata_sg_setup_one(qc))
5409 qc->flags &= ~ATA_QCFLAG_DMAMAP;
5412 ap->ops->qc_prep(qc);
5414 qc->err_mask |= ap->ops->qc_issue(qc);
5415 if (unlikely(qc->err_mask))
5420 qc->flags &= ~ATA_QCFLAG_DMAMAP;
5421 qc->err_mask |= AC_ERR_SYSTEM;
5423 ata_qc_complete(qc);
5427 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
5428 * @qc: command to issue to device
5430 * Using various libata functions and hooks, this function
5431 * starts an ATA command. ATA commands are grouped into
5432 * classes called "protocols", and issuing each type of protocol
5433 * is slightly different.
5435 * May be used as the qc_issue() entry in ata_port_operations.
5438 * spin_lock_irqsave(host lock)
5441 * Zero on success, AC_ERR_* mask on failure
5444 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
5446 struct ata_port *ap = qc->ap;
5448 /* Use polling pio if the LLD doesn't handle
5449 * interrupt driven pio and atapi CDB interrupt.
5451 if (ap->flags & ATA_FLAG_PIO_POLLING) {
5452 switch (qc->tf.protocol) {
5454 case ATA_PROT_NODATA:
5455 case ATA_PROT_ATAPI:
5456 case ATA_PROT_ATAPI_NODATA:
5457 qc->tf.flags |= ATA_TFLAG_POLLING;
5459 case ATA_PROT_ATAPI_DMA:
5460 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
5461 /* see ata_dma_blacklisted() */
5469 /* select the device */
5470 ata_dev_select(ap, qc->dev->devno, 1, 0);
5472 /* start the command */
5473 switch (qc->tf.protocol) {
5474 case ATA_PROT_NODATA:
5475 if (qc->tf.flags & ATA_TFLAG_POLLING)
5476 ata_qc_set_polling(qc);
5478 ata_tf_to_host(ap, &qc->tf);
5479 ap->hsm_task_state = HSM_ST_LAST;
5481 if (qc->tf.flags & ATA_TFLAG_POLLING)
5482 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5487 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5489 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
5490 ap->ops->bmdma_setup(qc); /* set up bmdma */
5491 ap->ops->bmdma_start(qc); /* initiate bmdma */
5492 ap->hsm_task_state = HSM_ST_LAST;
5496 if (qc->tf.flags & ATA_TFLAG_POLLING)
5497 ata_qc_set_polling(qc);
5499 ata_tf_to_host(ap, &qc->tf);
5501 if (qc->tf.flags & ATA_TFLAG_WRITE) {
5502 /* PIO data out protocol */
5503 ap->hsm_task_state = HSM_ST_FIRST;
5504 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5506 /* always send first data block using
5507 * the ata_pio_task() codepath.
5510 /* PIO data in protocol */
5511 ap->hsm_task_state = HSM_ST;
5513 if (qc->tf.flags & ATA_TFLAG_POLLING)
5514 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5516 /* if polling, ata_pio_task() handles the rest.
5517 * otherwise, interrupt handler takes over from here.
5523 case ATA_PROT_ATAPI:
5524 case ATA_PROT_ATAPI_NODATA:
5525 if (qc->tf.flags & ATA_TFLAG_POLLING)
5526 ata_qc_set_polling(qc);
5528 ata_tf_to_host(ap, &qc->tf);
5530 ap->hsm_task_state = HSM_ST_FIRST;
5532 /* send cdb by polling if no cdb interrupt */
5533 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
5534 (qc->tf.flags & ATA_TFLAG_POLLING))
5535 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5538 case ATA_PROT_ATAPI_DMA:
5539 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5541 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
5542 ap->ops->bmdma_setup(qc); /* set up bmdma */
5543 ap->hsm_task_state = HSM_ST_FIRST;
5545 /* send cdb by polling if no cdb interrupt */
5546 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5547 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5552 return AC_ERR_SYSTEM;
5559 * ata_host_intr - Handle host interrupt for given (port, task)
5560 * @ap: Port on which interrupt arrived (possibly...)
5561 * @qc: Taskfile currently active in engine
5563 * Handle host interrupt for given queued command. Currently,
5564 * only DMA interrupts are handled. All other commands are
5565 * handled via polling with interrupts disabled (nIEN bit).
5568 * spin_lock_irqsave(host lock)
5571 * One if interrupt was handled, zero if not (shared irq).
5574 inline unsigned int ata_host_intr (struct ata_port *ap,
5575 struct ata_queued_cmd *qc)
5577 struct ata_eh_info *ehi = &ap->eh_info;
5578 u8 status, host_stat = 0;
5580 VPRINTK("ata%u: protocol %d task_state %d\n",
5581 ap->print_id, qc->tf.protocol, ap->hsm_task_state);
5583 /* Check whether we are expecting interrupt in this state */
5584 switch (ap->hsm_task_state) {
5586 /* Some pre-ATAPI-4 devices assert INTRQ
5587 * at this state when ready to receive CDB.
5590 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
5591 * The flag was turned on only for atapi devices.
5592 * No need to check is_atapi_taskfile(&qc->tf) again.
5594 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5598 if (qc->tf.protocol == ATA_PROT_DMA ||
5599 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
5600 /* check status of DMA engine */
5601 host_stat = ap->ops->bmdma_status(ap);
5602 VPRINTK("ata%u: host_stat 0x%X\n",
5603 ap->print_id, host_stat);
5605 /* if it's not our irq... */
5606 if (!(host_stat & ATA_DMA_INTR))
5609 /* before we do anything else, clear DMA-Start bit */
5610 ap->ops->bmdma_stop(qc);
5612 if (unlikely(host_stat & ATA_DMA_ERR)) {
5613 /* error when transfering data to/from memory */
5614 qc->err_mask |= AC_ERR_HOST_BUS;
5615 ap->hsm_task_state = HSM_ST_ERR;
5625 /* check altstatus */
5626 status = ata_altstatus(ap);
5627 if (status & ATA_BUSY)
5630 /* check main status, clearing INTRQ */
5631 status = ata_chk_status(ap);
5632 if (unlikely(status & ATA_BUSY))
5635 /* ack bmdma irq events */
5636 ap->ops->irq_clear(ap);
5638 ata_hsm_move(ap, qc, status, 0);
5640 if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA ||
5641 qc->tf.protocol == ATA_PROT_ATAPI_DMA))
5642 ata_ehi_push_desc(ehi, "BMDMA stat 0x%x", host_stat);
5644 return 1; /* irq handled */
5647 ap->stats.idle_irq++;
5650 if ((ap->stats.idle_irq % 1000) == 0) {
5651 ap->ops->irq_ack(ap, 0); /* debug trap */
5652 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5656 return 0; /* irq not handled */
5660 * ata_interrupt - Default ATA host interrupt handler
5661 * @irq: irq line (unused)
5662 * @dev_instance: pointer to our ata_host information structure
5664 * Default interrupt handler for PCI IDE devices. Calls
5665 * ata_host_intr() for each port that is not disabled.
5668 * Obtains host lock during operation.
5671 * IRQ_NONE or IRQ_HANDLED.
5674 irqreturn_t ata_interrupt (int irq, void *dev_instance)
5676 struct ata_host *host = dev_instance;
5678 unsigned int handled = 0;
5679 unsigned long flags;
5681 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
5682 spin_lock_irqsave(&host->lock, flags);
5684 for (i = 0; i < host->n_ports; i++) {
5685 struct ata_port *ap;
5687 ap = host->ports[i];
5689 !(ap->flags & ATA_FLAG_DISABLED)) {
5690 struct ata_queued_cmd *qc;
5692 qc = ata_qc_from_tag(ap, ap->active_tag);
5693 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5694 (qc->flags & ATA_QCFLAG_ACTIVE))
5695 handled |= ata_host_intr(ap, qc);
5699 spin_unlock_irqrestore(&host->lock, flags);
5701 return IRQ_RETVAL(handled);
5705 * sata_scr_valid - test whether SCRs are accessible
5706 * @ap: ATA port to test SCR accessibility for
5708 * Test whether SCRs are accessible for @ap.
5714 * 1 if SCRs are accessible, 0 otherwise.
5716 int sata_scr_valid(struct ata_port *ap)
5718 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5722 * sata_scr_read - read SCR register of the specified port
5723 * @ap: ATA port to read SCR for
5725 * @val: Place to store read value
5727 * Read SCR register @reg of @ap into *@val. This function is
5728 * guaranteed to succeed if the cable type of the port is SATA
5729 * and the port implements ->scr_read.
5735 * 0 on success, negative errno on failure.
5737 int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
5739 if (sata_scr_valid(ap)) {
5740 *val = ap->ops->scr_read(ap, reg);
5747 * sata_scr_write - write SCR register of the specified port
5748 * @ap: ATA port to write SCR for
5749 * @reg: SCR to write
5750 * @val: value to write
5752 * Write @val to SCR register @reg of @ap. This function is
5753 * guaranteed to succeed if the cable type of the port is SATA
5754 * and the port implements ->scr_read.
5760 * 0 on success, negative errno on failure.
5762 int sata_scr_write(struct ata_port *ap, int reg, u32 val)
5764 if (sata_scr_valid(ap)) {
5765 ap->ops->scr_write(ap, reg, val);
5772 * sata_scr_write_flush - write SCR register of the specified port and flush
5773 * @ap: ATA port to write SCR for
5774 * @reg: SCR to write
5775 * @val: value to write
5777 * This function is identical to sata_scr_write() except that this
5778 * function performs flush after writing to the register.
5784 * 0 on success, negative errno on failure.
5786 int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
5788 if (sata_scr_valid(ap)) {
5789 ap->ops->scr_write(ap, reg, val);
5790 ap->ops->scr_read(ap, reg);
5797 * ata_port_online - test whether the given port is online
5798 * @ap: ATA port to test
5800 * Test whether @ap is online. Note that this function returns 0
5801 * if online status of @ap cannot be obtained, so
5802 * ata_port_online(ap) != !ata_port_offline(ap).
5808 * 1 if the port online status is available and online.
5810 int ata_port_online(struct ata_port *ap)
5814 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
5820 * ata_port_offline - test whether the given port is offline
5821 * @ap: ATA port to test
5823 * Test whether @ap is offline. Note that this function returns
5824 * 0 if offline status of @ap cannot be obtained, so
5825 * ata_port_online(ap) != !ata_port_offline(ap).
5831 * 1 if the port offline status is available and offline.
5833 int ata_port_offline(struct ata_port *ap)
5837 if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
5842 int ata_flush_cache(struct ata_device *dev)
5844 unsigned int err_mask;
5847 if (!ata_try_flush_cache(dev))
5850 if (dev->flags & ATA_DFLAG_FLUSH_EXT)
5851 cmd = ATA_CMD_FLUSH_EXT;
5853 cmd = ATA_CMD_FLUSH;
5855 err_mask = ata_do_simple_cmd(dev, cmd);
5857 ata_dev_printk(dev, KERN_ERR, "failed to flush cache\n");
5865 static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
5866 unsigned int action, unsigned int ehi_flags,
5869 unsigned long flags;
5872 for (i = 0; i < host->n_ports; i++) {
5873 struct ata_port *ap = host->ports[i];
5875 /* Previous resume operation might still be in
5876 * progress. Wait for PM_PENDING to clear.
5878 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
5879 ata_port_wait_eh(ap);
5880 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5883 /* request PM ops to EH */
5884 spin_lock_irqsave(ap->lock, flags);
5889 ap->pm_result = &rc;
5892 ap->pflags |= ATA_PFLAG_PM_PENDING;
5893 ap->eh_info.action |= action;
5894 ap->eh_info.flags |= ehi_flags;
5896 ata_port_schedule_eh(ap);
5898 spin_unlock_irqrestore(ap->lock, flags);
5900 /* wait and check result */
5902 ata_port_wait_eh(ap);
5903 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5913 * ata_host_suspend - suspend host
5914 * @host: host to suspend
5917 * Suspend @host. Actual operation is performed by EH. This
5918 * function requests EH to perform PM operations and waits for EH
5922 * Kernel thread context (may sleep).
5925 * 0 on success, -errno on failure.
5927 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5931 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5933 host->dev->power.power_state = mesg;
5938 * ata_host_resume - resume host
5939 * @host: host to resume
5941 * Resume @host. Actual operation is performed by EH. This
5942 * function requests EH to perform PM operations and returns.
5943 * Note that all resume operations are performed parallely.
5946 * Kernel thread context (may sleep).
5948 void ata_host_resume(struct ata_host *host)
5950 ata_host_request_pm(host, PMSG_ON, ATA_EH_SOFTRESET,
5951 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5952 host->dev->power.power_state = PMSG_ON;
5957 * ata_port_start - Set port up for dma.
5958 * @ap: Port to initialize
5960 * Called just after data structures for each port are
5961 * initialized. Allocates space for PRD table.
5963 * May be used as the port_start() entry in ata_port_operations.
5966 * Inherited from caller.
5968 int ata_port_start(struct ata_port *ap)
5970 struct device *dev = ap->dev;
5973 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
5978 rc = ata_pad_alloc(ap, dev);
5982 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
5983 (unsigned long long)ap->prd_dma);
5988 * ata_dev_init - Initialize an ata_device structure
5989 * @dev: Device structure to initialize
5991 * Initialize @dev in preparation for probing.
5994 * Inherited from caller.
5996 void ata_dev_init(struct ata_device *dev)
5998 struct ata_port *ap = dev->ap;
5999 unsigned long flags;
6001 /* SATA spd limit is bound to the first device */
6002 ap->sata_spd_limit = ap->hw_sata_spd_limit;
6004 /* High bits of dev->flags are used to record warm plug
6005 * requests which occur asynchronously. Synchronize using
6008 spin_lock_irqsave(ap->lock, flags);
6009 dev->flags &= ~ATA_DFLAG_INIT_MASK;
6010 spin_unlock_irqrestore(ap->lock, flags);
6012 memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
6013 sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6014 dev->pio_mask = UINT_MAX;
6015 dev->mwdma_mask = UINT_MAX;
6016 dev->udma_mask = UINT_MAX;
6020 * ata_port_alloc - allocate and initialize basic ATA port resources
6021 * @host: ATA host this allocated port belongs to
6023 * Allocate and initialize basic ATA port resources.
6026 * Allocate ATA port on success, NULL on failure.
6029 * Inherited from calling layer (may sleep).
6031 struct ata_port *ata_port_alloc(struct ata_host *host)
6033 struct ata_port *ap;
6038 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
6042 ap->pflags |= ATA_PFLAG_INITIALIZING;
6043 ap->lock = &host->lock;
6044 ap->flags = ATA_FLAG_DISABLED;
6046 ap->ctl = ATA_DEVCTL_OBS;
6048 ap->dev = host->dev;
6050 ap->hw_sata_spd_limit = UINT_MAX;
6051 ap->active_tag = ATA_TAG_POISON;
6052 ap->last_ctl = 0xFF;
6054 #if defined(ATA_VERBOSE_DEBUG)
6055 /* turn on all debugging levels */
6056 ap->msg_enable = 0x00FF;
6057 #elif defined(ATA_DEBUG)
6058 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
6060 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6063 INIT_DELAYED_WORK(&ap->port_task, NULL);
6064 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
6065 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
6066 INIT_LIST_HEAD(&ap->eh_done_q);
6067 init_waitqueue_head(&ap->eh_wait_q);
6069 ap->cbl = ATA_CBL_NONE;
6071 for (i = 0; i < ATA_MAX_DEVICES; i++) {
6072 struct ata_device *dev = &ap->device[i];
6079 ap->stats.unhandled_irq = 1;
6080 ap->stats.idle_irq = 1;
6085 static void ata_host_release(struct device *gendev, void *res)
6087 struct ata_host *host = dev_get_drvdata(gendev);
6090 for (i = 0; i < host->n_ports; i++) {
6091 struct ata_port *ap = host->ports[i];
6096 if ((host->flags & ATA_HOST_STARTED) && ap->ops->port_stop)
6097 ap->ops->port_stop(ap);
6100 if ((host->flags & ATA_HOST_STARTED) && host->ops->host_stop)
6101 host->ops->host_stop(host);
6103 for (i = 0; i < host->n_ports; i++) {
6104 struct ata_port *ap = host->ports[i];
6110 scsi_host_put(ap->scsi_host);
6113 host->ports[i] = NULL;
6116 dev_set_drvdata(gendev, NULL);
6120 * ata_host_alloc - allocate and init basic ATA host resources
6121 * @dev: generic device this host is associated with
6122 * @max_ports: maximum number of ATA ports associated with this host
6124 * Allocate and initialize basic ATA host resources. LLD calls
6125 * this function to allocate a host, initializes it fully and
6126 * attaches it using ata_host_register().
6128 * @max_ports ports are allocated and host->n_ports is
6129 * initialized to @max_ports. The caller is allowed to decrease
6130 * host->n_ports before calling ata_host_register(). The unused
6131 * ports will be automatically freed on registration.
6134 * Allocate ATA host on success, NULL on failure.
6137 * Inherited from calling layer (may sleep).
6139 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
6141 struct ata_host *host;
6147 if (!devres_open_group(dev, NULL, GFP_KERNEL))
6150 /* alloc a container for our list of ATA ports (buses) */
6151 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
6152 /* alloc a container for our list of ATA ports (buses) */
6153 host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
6157 devres_add(dev, host);
6158 dev_set_drvdata(dev, host);
6160 spin_lock_init(&host->lock);
6162 host->n_ports = max_ports;
6164 /* allocate ports bound to this host */
6165 for (i = 0; i < max_ports; i++) {
6166 struct ata_port *ap;
6168 ap = ata_port_alloc(host);
6173 host->ports[i] = ap;
6176 devres_remove_group(dev, NULL);
6180 devres_release_group(dev, NULL);
6185 * ata_host_alloc_pinfo - alloc host and init with port_info array
6186 * @dev: generic device this host is associated with
6187 * @ppi: array of ATA port_info to initialize host with
6188 * @n_ports: number of ATA ports attached to this host
6190 * Allocate ATA host and initialize with info from @ppi. If NULL
6191 * terminated, @ppi may contain fewer entries than @n_ports. The
6192 * last entry will be used for the remaining ports.
6195 * Allocate ATA host on success, NULL on failure.
6198 * Inherited from calling layer (may sleep).
6200 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
6201 const struct ata_port_info * const * ppi,
6204 const struct ata_port_info *pi;
6205 struct ata_host *host;
6208 host = ata_host_alloc(dev, n_ports);
6212 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
6213 struct ata_port *ap = host->ports[i];
6218 ap->pio_mask = pi->pio_mask;
6219 ap->mwdma_mask = pi->mwdma_mask;
6220 ap->udma_mask = pi->udma_mask;
6221 ap->flags |= pi->flags;
6222 ap->ops = pi->port_ops;
6224 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
6225 host->ops = pi->port_ops;
6226 if (!host->private_data && pi->private_data)
6227 host->private_data = pi->private_data;
6234 * ata_host_start - start and freeze ports of an ATA host
6235 * @host: ATA host to start ports for
6237 * Start and then freeze ports of @host. Started status is
6238 * recorded in host->flags, so this function can be called
6239 * multiple times. Ports are guaranteed to get started only
6240 * once. If host->ops isn't initialized yet, its set to the
6241 * first non-dummy port ops.
6244 * Inherited from calling layer (may sleep).
6247 * 0 if all ports are started successfully, -errno otherwise.
6249 int ata_host_start(struct ata_host *host)
6253 if (host->flags & ATA_HOST_STARTED)
6256 for (i = 0; i < host->n_ports; i++) {
6257 struct ata_port *ap = host->ports[i];
6259 if (!host->ops && !ata_port_is_dummy(ap))
6260 host->ops = ap->ops;
6262 if (ap->ops->port_start) {
6263 rc = ap->ops->port_start(ap);
6265 ata_port_printk(ap, KERN_ERR, "failed to "
6266 "start port (errno=%d)\n", rc);
6271 ata_eh_freeze_port(ap);
6274 host->flags |= ATA_HOST_STARTED;
6279 struct ata_port *ap = host->ports[i];
6281 if (ap->ops->port_stop)
6282 ap->ops->port_stop(ap);
6288 * ata_sas_host_init - Initialize a host struct
6289 * @host: host to initialize
6290 * @dev: device host is attached to
6291 * @flags: host flags
6295 * PCI/etc. bus probe sem.
6298 /* KILLME - the only user left is ipr */
6299 void ata_host_init(struct ata_host *host, struct device *dev,
6300 unsigned long flags, const struct ata_port_operations *ops)
6302 spin_lock_init(&host->lock);
6304 host->flags = flags;
6309 * ata_host_register - register initialized ATA host
6310 * @host: ATA host to register
6311 * @sht: template for SCSI host
6313 * Register initialized ATA host. @host is allocated using
6314 * ata_host_alloc() and fully initialized by LLD. This function
6315 * starts ports, registers @host with ATA and SCSI layers and
6316 * probe registered devices.
6319 * Inherited from calling layer (may sleep).
6322 * 0 on success, -errno otherwise.
6324 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
6328 /* host must have been started */
6329 if (!(host->flags & ATA_HOST_STARTED)) {
6330 dev_printk(KERN_ERR, host->dev,
6331 "BUG: trying to register unstarted host\n");
6336 /* Blow away unused ports. This happens when LLD can't
6337 * determine the exact number of ports to allocate at
6340 for (i = host->n_ports; host->ports[i]; i++)
6341 kfree(host->ports[i]);
6343 /* give ports names and add SCSI hosts */
6344 for (i = 0; i < host->n_ports; i++)
6345 host->ports[i]->print_id = ata_print_id++;
6347 rc = ata_scsi_add_hosts(host, sht);
6351 /* associate with ACPI nodes */
6352 ata_acpi_associate(host);
6354 /* set cable, sata_spd_limit and report */
6355 for (i = 0; i < host->n_ports; i++) {
6356 struct ata_port *ap = host->ports[i];
6359 unsigned long xfer_mask;
6361 /* set SATA cable type if still unset */
6362 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
6363 ap->cbl = ATA_CBL_SATA;
6365 /* init sata_spd_limit to the current value */
6366 if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
6367 int spd = (scontrol >> 4) & 0xf;
6369 ap->hw_sata_spd_limit &= (1 << spd) - 1;
6371 ap->sata_spd_limit = ap->hw_sata_spd_limit;
6373 /* report the secondary IRQ for second channel legacy */
6374 irq_line = host->irq;
6375 if (i == 1 && host->irq2)
6376 irq_line = host->irq2;
6378 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
6381 /* print per-port info to dmesg */
6382 if (!ata_port_is_dummy(ap))
6383 ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
6384 "ctl 0x%p bmdma 0x%p irq %d\n",
6385 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6386 ata_mode_string(xfer_mask),
6387 ap->ioaddr.cmd_addr,
6388 ap->ioaddr.ctl_addr,
6389 ap->ioaddr.bmdma_addr,
6392 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
6395 /* perform each probe synchronously */
6396 DPRINTK("probe begin\n");
6397 for (i = 0; i < host->n_ports; i++) {
6398 struct ata_port *ap = host->ports[i];
6402 if (ap->ops->error_handler) {
6403 struct ata_eh_info *ehi = &ap->eh_info;
6404 unsigned long flags;
6408 /* kick EH for boot probing */
6409 spin_lock_irqsave(ap->lock, flags);
6411 ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
6412 ehi->action |= ATA_EH_SOFTRESET;
6413 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
6415 ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6416 ap->pflags |= ATA_PFLAG_LOADING;
6417 ata_port_schedule_eh(ap);
6419 spin_unlock_irqrestore(ap->lock, flags);
6421 /* wait for EH to finish */
6422 ata_port_wait_eh(ap);
6424 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
6425 rc = ata_bus_probe(ap);
6426 DPRINTK("ata%u: bus probe end\n", ap->print_id);
6429 /* FIXME: do something useful here?
6430 * Current libata behavior will
6431 * tear down everything when
6432 * the module is removed
6433 * or the h/w is unplugged.
6439 /* probes are done, now scan each port's disk(s) */
6440 DPRINTK("host probe begin\n");
6441 for (i = 0; i < host->n_ports; i++) {
6442 struct ata_port *ap = host->ports[i];
6444 ata_scsi_scan_host(ap);
6451 * ata_host_activate - start host, request IRQ and register it
6452 * @host: target ATA host
6453 * @irq: IRQ to request
6454 * @irq_handler: irq_handler used when requesting IRQ
6455 * @irq_flags: irq_flags used when requesting IRQ
6456 * @sht: scsi_host_template to use when registering the host
6458 * After allocating an ATA host and initializing it, most libata
6459 * LLDs perform three steps to activate the host - start host,
6460 * request IRQ and register it. This helper takes necessasry
6461 * arguments and performs the three steps in one go.
6464 * Inherited from calling layer (may sleep).
6467 * 0 on success, -errno otherwise.
6469 int ata_host_activate(struct ata_host *host, int irq,
6470 irq_handler_t irq_handler, unsigned long irq_flags,
6471 struct scsi_host_template *sht)
6475 rc = ata_host_start(host);
6479 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
6480 dev_driver_string(host->dev), host);
6484 /* Used to print device info at probe */
6487 rc = ata_host_register(host, sht);
6488 /* if failed, just free the IRQ and leave ports alone */
6490 devm_free_irq(host->dev, irq, host);
6496 * ata_port_detach - Detach ATA port in prepration of device removal
6497 * @ap: ATA port to be detached
6499 * Detach all ATA devices and the associated SCSI devices of @ap;
6500 * then, remove the associated SCSI host. @ap is guaranteed to
6501 * be quiescent on return from this function.
6504 * Kernel thread context (may sleep).
6506 void ata_port_detach(struct ata_port *ap)
6508 unsigned long flags;
6511 if (!ap->ops->error_handler)
6514 /* tell EH we're leaving & flush EH */
6515 spin_lock_irqsave(ap->lock, flags);
6516 ap->pflags |= ATA_PFLAG_UNLOADING;
6517 spin_unlock_irqrestore(ap->lock, flags);
6519 ata_port_wait_eh(ap);
6521 /* EH is now guaranteed to see UNLOADING, so no new device
6522 * will be attached. Disable all existing devices.
6524 spin_lock_irqsave(ap->lock, flags);
6526 for (i = 0; i < ATA_MAX_DEVICES; i++)
6527 ata_dev_disable(&ap->device[i]);
6529 spin_unlock_irqrestore(ap->lock, flags);
6531 /* Final freeze & EH. All in-flight commands are aborted. EH
6532 * will be skipped and retrials will be terminated with bad
6535 spin_lock_irqsave(ap->lock, flags);
6536 ata_port_freeze(ap); /* won't be thawed */
6537 spin_unlock_irqrestore(ap->lock, flags);
6539 ata_port_wait_eh(ap);
6540 cancel_rearming_delayed_work(&ap->hotplug_task);
6543 /* remove the associated SCSI host */
6544 scsi_remove_host(ap->scsi_host);
6548 * ata_host_detach - Detach all ports of an ATA host
6549 * @host: Host to detach
6551 * Detach all ports of @host.
6554 * Kernel thread context (may sleep).
6556 void ata_host_detach(struct ata_host *host)
6560 for (i = 0; i < host->n_ports; i++)
6561 ata_port_detach(host->ports[i]);
6565 * ata_std_ports - initialize ioaddr with standard port offsets.
6566 * @ioaddr: IO address structure to be initialized
6568 * Utility function which initializes data_addr, error_addr,
6569 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
6570 * device_addr, status_addr, and command_addr to standard offsets
6571 * relative to cmd_addr.
6573 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
6576 void ata_std_ports(struct ata_ioports *ioaddr)
6578 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
6579 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
6580 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
6581 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
6582 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
6583 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
6584 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
6585 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
6586 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
6587 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
6594 * ata_pci_remove_one - PCI layer callback for device removal
6595 * @pdev: PCI device that was removed
6597 * PCI layer indicates to libata via this hook that hot-unplug or
6598 * module unload event has occurred. Detach all ports. Resource
6599 * release is handled via devres.
6602 * Inherited from PCI layer (may sleep).
6604 void ata_pci_remove_one(struct pci_dev *pdev)
6606 struct device *dev = pci_dev_to_dev(pdev);
6607 struct ata_host *host = dev_get_drvdata(dev);
6609 ata_host_detach(host);
6612 /* move to PCI subsystem */
6613 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
6615 unsigned long tmp = 0;
6617 switch (bits->width) {
6620 pci_read_config_byte(pdev, bits->reg, &tmp8);
6626 pci_read_config_word(pdev, bits->reg, &tmp16);
6632 pci_read_config_dword(pdev, bits->reg, &tmp32);
6643 return (tmp == bits->val) ? 1 : 0;
6647 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
6649 pci_save_state(pdev);
6650 pci_disable_device(pdev);
6652 if (mesg.event == PM_EVENT_SUSPEND)
6653 pci_set_power_state(pdev, PCI_D3hot);
6656 int ata_pci_device_do_resume(struct pci_dev *pdev)
6660 pci_set_power_state(pdev, PCI_D0);
6661 pci_restore_state(pdev);
6663 rc = pcim_enable_device(pdev);
6665 dev_printk(KERN_ERR, &pdev->dev,
6666 "failed to enable device after resume (%d)\n", rc);
6670 pci_set_master(pdev);
6674 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6676 struct ata_host *host = dev_get_drvdata(&pdev->dev);
6679 rc = ata_host_suspend(host, mesg);
6683 ata_pci_device_do_suspend(pdev, mesg);
6688 int ata_pci_device_resume(struct pci_dev *pdev)
6690 struct ata_host *host = dev_get_drvdata(&pdev->dev);
6693 rc = ata_pci_device_do_resume(pdev);
6695 ata_host_resume(host);
6698 #endif /* CONFIG_PM */
6700 #endif /* CONFIG_PCI */
6703 static int __init ata_init(void)
6705 ata_probe_timeout *= HZ;
6706 ata_wq = create_workqueue("ata");
6710 ata_aux_wq = create_singlethread_workqueue("ata_aux");
6712 destroy_workqueue(ata_wq);
6716 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
6720 static void __exit ata_exit(void)
6722 destroy_workqueue(ata_wq);
6723 destroy_workqueue(ata_aux_wq);
6726 subsys_initcall(ata_init);
6727 module_exit(ata_exit);
6729 static unsigned long ratelimit_time;
6730 static DEFINE_SPINLOCK(ata_ratelimit_lock);
6732 int ata_ratelimit(void)
6735 unsigned long flags;
6737 spin_lock_irqsave(&ata_ratelimit_lock, flags);
6739 if (time_after(jiffies, ratelimit_time)) {
6741 ratelimit_time = jiffies + (HZ/5);
6745 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
6751 * ata_wait_register - wait until register value changes
6752 * @reg: IO-mapped register
6753 * @mask: Mask to apply to read register value
6754 * @val: Wait condition
6755 * @interval_msec: polling interval in milliseconds
6756 * @timeout_msec: timeout in milliseconds
6758 * Waiting for some bits of register to change is a common
6759 * operation for ATA controllers. This function reads 32bit LE
6760 * IO-mapped register @reg and tests for the following condition.
6762 * (*@reg & mask) != val
6764 * If the condition is met, it returns; otherwise, the process is
6765 * repeated after @interval_msec until timeout.
6768 * Kernel thread context (may sleep)
6771 * The final register value.
6773 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
6774 unsigned long interval_msec,
6775 unsigned long timeout_msec)
6777 unsigned long timeout;
6780 tmp = ioread32(reg);
6782 /* Calculate timeout _after_ the first read to make sure
6783 * preceding writes reach the controller before starting to
6784 * eat away the timeout.
6786 timeout = jiffies + (timeout_msec * HZ) / 1000;
6788 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
6789 msleep(interval_msec);
6790 tmp = ioread32(reg);
6799 static void ata_dummy_noret(struct ata_port *ap) { }
6800 static int ata_dummy_ret0(struct ata_port *ap) { return 0; }
6801 static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }
6803 static u8 ata_dummy_check_status(struct ata_port *ap)
6808 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
6810 return AC_ERR_SYSTEM;
6813 const struct ata_port_operations ata_dummy_port_ops = {
6814 .port_disable = ata_port_disable,
6815 .check_status = ata_dummy_check_status,
6816 .check_altstatus = ata_dummy_check_status,
6817 .dev_select = ata_noop_dev_select,
6818 .qc_prep = ata_noop_qc_prep,
6819 .qc_issue = ata_dummy_qc_issue,
6820 .freeze = ata_dummy_noret,
6821 .thaw = ata_dummy_noret,
6822 .error_handler = ata_dummy_noret,
6823 .post_internal_cmd = ata_dummy_qc_noret,
6824 .irq_clear = ata_dummy_noret,
6825 .port_start = ata_dummy_ret0,
6826 .port_stop = ata_dummy_noret,
6829 const struct ata_port_info ata_dummy_port_info = {
6830 .port_ops = &ata_dummy_port_ops,
6834 * libata is essentially a library of internal helper functions for
6835 * low-level ATA host controller drivers. As such, the API/ABI is
6836 * likely to change as new drivers are added and updated.
6837 * Do not depend on ABI/API stability.
6840 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
6841 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
6842 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6843 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6844 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
6845 EXPORT_SYMBOL_GPL(ata_std_bios_param);
6846 EXPORT_SYMBOL_GPL(ata_std_ports);
6847 EXPORT_SYMBOL_GPL(ata_host_init);
6848 EXPORT_SYMBOL_GPL(ata_host_alloc);
6849 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6850 EXPORT_SYMBOL_GPL(ata_host_start);
6851 EXPORT_SYMBOL_GPL(ata_host_register);
6852 EXPORT_SYMBOL_GPL(ata_host_activate);
6853 EXPORT_SYMBOL_GPL(ata_host_detach);
6854 EXPORT_SYMBOL_GPL(ata_sg_init);
6855 EXPORT_SYMBOL_GPL(ata_sg_init_one);
6856 EXPORT_SYMBOL_GPL(ata_hsm_move);
6857 EXPORT_SYMBOL_GPL(ata_qc_complete);
6858 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
6859 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
6860 EXPORT_SYMBOL_GPL(ata_tf_load);
6861 EXPORT_SYMBOL_GPL(ata_tf_read);
6862 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
6863 EXPORT_SYMBOL_GPL(ata_std_dev_select);
6864 EXPORT_SYMBOL_GPL(sata_print_link_status);
6865 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
6866 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6867 EXPORT_SYMBOL_GPL(ata_check_status);
6868 EXPORT_SYMBOL_GPL(ata_altstatus);
6869 EXPORT_SYMBOL_GPL(ata_exec_command);
6870 EXPORT_SYMBOL_GPL(ata_port_start);
6871 EXPORT_SYMBOL_GPL(ata_sff_port_start);
6872 EXPORT_SYMBOL_GPL(ata_interrupt);
6873 EXPORT_SYMBOL_GPL(ata_do_set_mode);
6874 EXPORT_SYMBOL_GPL(ata_data_xfer);
6875 EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
6876 EXPORT_SYMBOL_GPL(ata_qc_prep);
6877 EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
6878 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
6879 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
6880 EXPORT_SYMBOL_GPL(ata_bmdma_start);
6881 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
6882 EXPORT_SYMBOL_GPL(ata_bmdma_status);
6883 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
6884 EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
6885 EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
6886 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
6887 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
6888 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
6889 EXPORT_SYMBOL_GPL(ata_port_probe);
6890 EXPORT_SYMBOL_GPL(ata_dev_disable);
6891 EXPORT_SYMBOL_GPL(sata_set_spd);
6892 EXPORT_SYMBOL_GPL(sata_phy_debounce);
6893 EXPORT_SYMBOL_GPL(sata_phy_resume);
6894 EXPORT_SYMBOL_GPL(sata_phy_reset);
6895 EXPORT_SYMBOL_GPL(__sata_phy_reset);
6896 EXPORT_SYMBOL_GPL(ata_bus_reset);
6897 EXPORT_SYMBOL_GPL(ata_std_prereset);
6898 EXPORT_SYMBOL_GPL(ata_std_softreset);
6899 EXPORT_SYMBOL_GPL(sata_port_hardreset);
6900 EXPORT_SYMBOL_GPL(sata_std_hardreset);
6901 EXPORT_SYMBOL_GPL(ata_std_postreset);
6902 EXPORT_SYMBOL_GPL(ata_dev_classify);
6903 EXPORT_SYMBOL_GPL(ata_dev_pair);
6904 EXPORT_SYMBOL_GPL(ata_port_disable);
6905 EXPORT_SYMBOL_GPL(ata_ratelimit);
6906 EXPORT_SYMBOL_GPL(ata_wait_register);
6907 EXPORT_SYMBOL_GPL(ata_busy_sleep);
6908 EXPORT_SYMBOL_GPL(ata_wait_ready);
6909 EXPORT_SYMBOL_GPL(ata_port_queue_task);
6910 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
6911 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
6912 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6913 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6914 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6915 EXPORT_SYMBOL_GPL(ata_host_intr);
6916 EXPORT_SYMBOL_GPL(sata_scr_valid);
6917 EXPORT_SYMBOL_GPL(sata_scr_read);
6918 EXPORT_SYMBOL_GPL(sata_scr_write);
6919 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
6920 EXPORT_SYMBOL_GPL(ata_port_online);
6921 EXPORT_SYMBOL_GPL(ata_port_offline);
6923 EXPORT_SYMBOL_GPL(ata_host_suspend);
6924 EXPORT_SYMBOL_GPL(ata_host_resume);
6925 #endif /* CONFIG_PM */
6926 EXPORT_SYMBOL_GPL(ata_id_string);
6927 EXPORT_SYMBOL_GPL(ata_id_c_string);
6928 EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
6929 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
6931 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6932 EXPORT_SYMBOL_GPL(ata_timing_compute);
6933 EXPORT_SYMBOL_GPL(ata_timing_merge);
6936 EXPORT_SYMBOL_GPL(pci_test_config_bits);
6937 EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
6938 EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
6939 EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
6940 EXPORT_SYMBOL_GPL(ata_pci_init_one);
6941 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6943 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
6944 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
6945 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
6946 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6947 #endif /* CONFIG_PM */
6948 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
6949 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
6950 #endif /* CONFIG_PCI */
6952 EXPORT_SYMBOL_GPL(ata_eng_timeout);
6953 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6954 EXPORT_SYMBOL_GPL(ata_port_abort);
6955 EXPORT_SYMBOL_GPL(ata_port_freeze);
6956 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
6957 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6958 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
6959 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6960 EXPORT_SYMBOL_GPL(ata_do_eh);
6961 EXPORT_SYMBOL_GPL(ata_irq_on);
6962 EXPORT_SYMBOL_GPL(ata_dummy_irq_on);
6963 EXPORT_SYMBOL_GPL(ata_irq_ack);
6964 EXPORT_SYMBOL_GPL(ata_dummy_irq_ack);
6965 EXPORT_SYMBOL_GPL(ata_dev_try_classify);
6967 EXPORT_SYMBOL_GPL(ata_cable_40wire);
6968 EXPORT_SYMBOL_GPL(ata_cable_80wire);
6969 EXPORT_SYMBOL_GPL(ata_cable_unknown);
6970 EXPORT_SYMBOL_GPL(ata_cable_sata);