2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
33 * Standards documents from:
34 * http://www.t13.org (ATA standards, PCI DMA IDE spec)
35 * http://www.t10.org (SCSI MMC - for ATAPI MMC)
36 * http://www.sata-io.org (SATA)
37 * http://www.compactflash.org (CF)
38 * http://www.qic.org (QIC157 - Tape and DSC)
39 * http://www.ce-ata.org (CE-ATA: not supported)
43 #include <linux/kernel.h>
44 #include <linux/module.h>
45 #include <linux/pci.h>
46 #include <linux/init.h>
47 #include <linux/list.h>
49 #include <linux/spinlock.h>
50 #include <linux/blkdev.h>
51 #include <linux/delay.h>
52 #include <linux/timer.h>
53 #include <linux/interrupt.h>
54 #include <linux/completion.h>
55 #include <linux/suspend.h>
56 #include <linux/workqueue.h>
57 #include <linux/jiffies.h>
58 #include <linux/scatterlist.h>
60 #include <scsi/scsi.h>
61 #include <scsi/scsi_cmnd.h>
62 #include <scsi/scsi_host.h>
63 #include <linux/libata.h>
64 #include <asm/semaphore.h>
65 #include <asm/byteorder.h>
66 #include <linux/cdrom.h>
71 /* debounce timing parameters in msecs { interval, duration, timeout } */
72 const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
73 const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
74 const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
76 const struct ata_port_operations ata_base_port_ops = {
77 .prereset = ata_std_prereset,
78 .postreset = ata_std_postreset,
79 .error_handler = ata_std_error_handler,
82 const struct ata_port_operations sata_port_ops = {
83 .inherits = &ata_base_port_ops,
85 .qc_defer = ata_std_qc_defer,
86 .hardreset = sata_std_hardreset,
89 static unsigned int ata_dev_init_params(struct ata_device *dev,
90 u16 heads, u16 sectors);
91 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
92 static unsigned int ata_dev_set_feature(struct ata_device *dev,
93 u8 enable, u8 feature);
94 static void ata_dev_xfermask(struct ata_device *dev);
95 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
97 unsigned int ata_print_id = 1;
98 static struct workqueue_struct *ata_wq;
100 struct workqueue_struct *ata_aux_wq;
102 struct ata_force_param {
106 unsigned long xfer_mask;
107 unsigned int horkage_on;
108 unsigned int horkage_off;
111 struct ata_force_ent {
114 struct ata_force_param param;
117 static struct ata_force_ent *ata_force_tbl;
118 static int ata_force_tbl_size;
120 static char ata_force_param_buf[PAGE_SIZE] __initdata;
121 /* param_buf is thrown away after initialization, disallow read */
122 module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
123 MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/kernel-parameters.txt for details)");
125 int atapi_enabled = 1;
126 module_param(atapi_enabled, int, 0444);
127 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
129 static int atapi_dmadir = 0;
130 module_param(atapi_dmadir, int, 0444);
131 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
133 int atapi_passthru16 = 1;
134 module_param(atapi_passthru16, int, 0444);
135 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");
138 module_param_named(fua, libata_fua, int, 0444);
139 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
141 static int ata_ignore_hpa;
142 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
143 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
145 static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
146 module_param_named(dma, libata_dma_mask, int, 0444);
147 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
149 static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
150 module_param(ata_probe_timeout, int, 0444);
151 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
153 int libata_noacpi = 0;
154 module_param_named(noacpi, libata_noacpi, int, 0444);
155 MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set");
157 int libata_allow_tpm = 0;
158 module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
159 MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands");
161 MODULE_AUTHOR("Jeff Garzik");
162 MODULE_DESCRIPTION("Library module for ATA devices");
163 MODULE_LICENSE("GPL");
164 MODULE_VERSION(DRV_VERSION);
168 * ata_force_cbl - force cable type according to libata.force
169 * @ap: ATA port of interest
171 * Force cable type according to libata.force and whine about it.
172 * The last entry which has matching port number is used, so it
173 * can be specified as part of device force parameters. For
174 * example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
180 void ata_force_cbl(struct ata_port *ap)
184 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
185 const struct ata_force_ent *fe = &ata_force_tbl[i];
187 if (fe->port != -1 && fe->port != ap->print_id)
190 if (fe->param.cbl == ATA_CBL_NONE)
193 ap->cbl = fe->param.cbl;
194 ata_port_printk(ap, KERN_NOTICE,
195 "FORCE: cable set to %s\n", fe->param.name);
201 * ata_force_spd_limit - force SATA spd limit according to libata.force
202 * @link: ATA link of interest
204 * Force SATA spd limit according to libata.force and whine about
205 * it. When only the port part is specified (e.g. 1:), the limit
206 * applies to all links connected to both the host link and all
207 * fan-out ports connected via PMP. If the device part is
208 * specified as 0 (e.g. 1.00:), it specifies the first fan-out
209 * link not the host link. Device number 15 always points to the
210 * host link whether PMP is attached or not.
215 static void ata_force_spd_limit(struct ata_link *link)
219 if (ata_is_host_link(link))
224 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
225 const struct ata_force_ent *fe = &ata_force_tbl[i];
227 if (fe->port != -1 && fe->port != link->ap->print_id)
230 if (fe->device != -1 && fe->device != linkno)
233 if (!fe->param.spd_limit)
236 link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
237 ata_link_printk(link, KERN_NOTICE,
238 "FORCE: PHY spd limit set to %s\n", fe->param.name);
244 * ata_force_xfermask - force xfermask according to libata.force
245 * @dev: ATA device of interest
247 * Force xfer_mask according to libata.force and whine about it.
248 * For consistency with link selection, device number 15 selects
249 * the first device connected to the host link.
254 static void ata_force_xfermask(struct ata_device *dev)
256 int devno = dev->link->pmp + dev->devno;
257 int alt_devno = devno;
260 /* allow n.15 for the first device attached to host port */
261 if (ata_is_host_link(dev->link) && devno == 0)
264 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
265 const struct ata_force_ent *fe = &ata_force_tbl[i];
266 unsigned long pio_mask, mwdma_mask, udma_mask;
268 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
271 if (fe->device != -1 && fe->device != devno &&
272 fe->device != alt_devno)
275 if (!fe->param.xfer_mask)
278 ata_unpack_xfermask(fe->param.xfer_mask,
279 &pio_mask, &mwdma_mask, &udma_mask);
281 dev->udma_mask = udma_mask;
282 else if (mwdma_mask) {
284 dev->mwdma_mask = mwdma_mask;
288 dev->pio_mask = pio_mask;
291 ata_dev_printk(dev, KERN_NOTICE,
292 "FORCE: xfer_mask set to %s\n", fe->param.name);
298 * ata_force_horkage - force horkage according to libata.force
299 * @dev: ATA device of interest
301 * Force horkage according to libata.force and whine about it.
302 * For consistency with link selection, device number 15 selects
303 * the first device connected to the host link.
308 static void ata_force_horkage(struct ata_device *dev)
310 int devno = dev->link->pmp + dev->devno;
311 int alt_devno = devno;
314 /* allow n.15 for the first device attached to host port */
315 if (ata_is_host_link(dev->link) && devno == 0)
318 for (i = 0; i < ata_force_tbl_size; i++) {
319 const struct ata_force_ent *fe = &ata_force_tbl[i];
321 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
324 if (fe->device != -1 && fe->device != devno &&
325 fe->device != alt_devno)
328 if (!(~dev->horkage & fe->param.horkage_on) &&
329 !(dev->horkage & fe->param.horkage_off))
332 dev->horkage |= fe->param.horkage_on;
333 dev->horkage &= ~fe->param.horkage_off;
335 ata_dev_printk(dev, KERN_NOTICE,
336 "FORCE: horkage modified (%s)\n", fe->param.name);
341 * atapi_cmd_type - Determine ATAPI command type from SCSI opcode
342 * @opcode: SCSI opcode
344 * Determine ATAPI command type from @opcode.
350 * ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC}
352 int atapi_cmd_type(u8 opcode)
361 case GPCMD_WRITE_AND_VERIFY_10:
365 case GPCMD_READ_CD_MSF:
366 return ATAPI_READ_CD;
370 if (atapi_passthru16)
371 return ATAPI_PASS_THRU;
379 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
380 * @tf: Taskfile to convert
381 * @pmp: Port multiplier port
382 * @is_cmd: This FIS is for command
383 * @fis: Buffer into which data will output
385 * Converts a standard ATA taskfile to a Serial ATA
386 * FIS structure (Register - Host to Device).
389 * Inherited from caller.
391 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
393 fis[0] = 0x27; /* Register - Host to Device FIS */
394 fis[1] = pmp & 0xf; /* Port multiplier number*/
396 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
398 fis[2] = tf->command;
399 fis[3] = tf->feature;
406 fis[8] = tf->hob_lbal;
407 fis[9] = tf->hob_lbam;
408 fis[10] = tf->hob_lbah;
409 fis[11] = tf->hob_feature;
412 fis[13] = tf->hob_nsect;
423 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
424 * @fis: Buffer from which data will be input
425 * @tf: Taskfile to output
427 * Converts a serial ATA FIS structure to a standard ATA taskfile.
430 * Inherited from caller.
433 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
435 tf->command = fis[2]; /* status */
436 tf->feature = fis[3]; /* error */
443 tf->hob_lbal = fis[8];
444 tf->hob_lbam = fis[9];
445 tf->hob_lbah = fis[10];
448 tf->hob_nsect = fis[13];
451 static const u8 ata_rw_cmds[] = {
455 ATA_CMD_READ_MULTI_EXT,
456 ATA_CMD_WRITE_MULTI_EXT,
460 ATA_CMD_WRITE_MULTI_FUA_EXT,
464 ATA_CMD_PIO_READ_EXT,
465 ATA_CMD_PIO_WRITE_EXT,
478 ATA_CMD_WRITE_FUA_EXT
482 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
483 * @tf: command to examine and configure
484 * @dev: device tf belongs to
486 * Examine the device configuration and tf->flags to calculate
487 * the proper read/write commands and protocol to use.
492 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
496 int index, fua, lba48, write;
498 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
499 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
500 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
502 if (dev->flags & ATA_DFLAG_PIO) {
503 tf->protocol = ATA_PROT_PIO;
504 index = dev->multi_count ? 0 : 8;
505 } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
506 /* Unable to use DMA due to host limitation */
507 tf->protocol = ATA_PROT_PIO;
508 index = dev->multi_count ? 0 : 8;
510 tf->protocol = ATA_PROT_DMA;
514 cmd = ata_rw_cmds[index + fua + lba48 + write];
523 * ata_tf_read_block - Read block address from ATA taskfile
524 * @tf: ATA taskfile of interest
525 * @dev: ATA device @tf belongs to
530 * Read block address from @tf. This function can handle all
531 * three address formats - LBA, LBA48 and CHS. tf->protocol and
532 * flags select the address format to use.
535 * Block address read from @tf.
537 u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
541 if (tf->flags & ATA_TFLAG_LBA) {
542 if (tf->flags & ATA_TFLAG_LBA48) {
543 block |= (u64)tf->hob_lbah << 40;
544 block |= (u64)tf->hob_lbam << 32;
545 block |= tf->hob_lbal << 24;
547 block |= (tf->device & 0xf) << 24;
549 block |= tf->lbah << 16;
550 block |= tf->lbam << 8;
555 cyl = tf->lbam | (tf->lbah << 8);
556 head = tf->device & 0xf;
559 block = (cyl * dev->heads + head) * dev->sectors + sect;
566 * ata_build_rw_tf - Build ATA taskfile for given read/write request
567 * @tf: Target ATA taskfile
568 * @dev: ATA device @tf belongs to
569 * @block: Block address
570 * @n_block: Number of blocks
571 * @tf_flags: RW/FUA etc...
577 * Build ATA taskfile @tf for read/write request described by
578 * @block, @n_block, @tf_flags and @tag on @dev.
582 * 0 on success, -ERANGE if the request is too large for @dev,
583 * -EINVAL if the request is invalid.
585 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
586 u64 block, u32 n_block, unsigned int tf_flags,
589 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
590 tf->flags |= tf_flags;
592 if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
594 if (!lba_48_ok(block, n_block))
597 tf->protocol = ATA_PROT_NCQ;
598 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
600 if (tf->flags & ATA_TFLAG_WRITE)
601 tf->command = ATA_CMD_FPDMA_WRITE;
603 tf->command = ATA_CMD_FPDMA_READ;
605 tf->nsect = tag << 3;
606 tf->hob_feature = (n_block >> 8) & 0xff;
607 tf->feature = n_block & 0xff;
609 tf->hob_lbah = (block >> 40) & 0xff;
610 tf->hob_lbam = (block >> 32) & 0xff;
611 tf->hob_lbal = (block >> 24) & 0xff;
612 tf->lbah = (block >> 16) & 0xff;
613 tf->lbam = (block >> 8) & 0xff;
614 tf->lbal = block & 0xff;
617 if (tf->flags & ATA_TFLAG_FUA)
618 tf->device |= 1 << 7;
619 } else if (dev->flags & ATA_DFLAG_LBA) {
620 tf->flags |= ATA_TFLAG_LBA;
622 if (lba_28_ok(block, n_block)) {
624 tf->device |= (block >> 24) & 0xf;
625 } else if (lba_48_ok(block, n_block)) {
626 if (!(dev->flags & ATA_DFLAG_LBA48))
630 tf->flags |= ATA_TFLAG_LBA48;
632 tf->hob_nsect = (n_block >> 8) & 0xff;
634 tf->hob_lbah = (block >> 40) & 0xff;
635 tf->hob_lbam = (block >> 32) & 0xff;
636 tf->hob_lbal = (block >> 24) & 0xff;
638 /* request too large even for LBA48 */
641 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
644 tf->nsect = n_block & 0xff;
646 tf->lbah = (block >> 16) & 0xff;
647 tf->lbam = (block >> 8) & 0xff;
648 tf->lbal = block & 0xff;
650 tf->device |= ATA_LBA;
653 u32 sect, head, cyl, track;
655 /* The request -may- be too large for CHS addressing. */
656 if (!lba_28_ok(block, n_block))
659 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
662 /* Convert LBA to CHS */
663 track = (u32)block / dev->sectors;
664 cyl = track / dev->heads;
665 head = track % dev->heads;
666 sect = (u32)block % dev->sectors + 1;
668 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
669 (u32)block, track, cyl, head, sect);
671 /* Check whether the converted CHS can fit.
675 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
678 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
689 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
690 * @pio_mask: pio_mask
691 * @mwdma_mask: mwdma_mask
692 * @udma_mask: udma_mask
694 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
695 * unsigned int xfer_mask.
703 unsigned long ata_pack_xfermask(unsigned long pio_mask,
704 unsigned long mwdma_mask,
705 unsigned long udma_mask)
707 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
708 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
709 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
713 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
714 * @xfer_mask: xfer_mask to unpack
715 * @pio_mask: resulting pio_mask
716 * @mwdma_mask: resulting mwdma_mask
717 * @udma_mask: resulting udma_mask
719 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
720 * Any NULL distination masks will be ignored.
722 void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
723 unsigned long *mwdma_mask, unsigned long *udma_mask)
726 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
728 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
730 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
733 static const struct ata_xfer_ent {
737 { ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
738 { ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
739 { ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
744 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
745 * @xfer_mask: xfer_mask of interest
747 * Return matching XFER_* value for @xfer_mask. Only the highest
748 * bit of @xfer_mask is considered.
754 * Matching XFER_* value, 0xff if no match found.
756 u8 ata_xfer_mask2mode(unsigned long xfer_mask)
758 int highbit = fls(xfer_mask) - 1;
759 const struct ata_xfer_ent *ent;
761 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
762 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
763 return ent->base + highbit - ent->shift;
768 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
769 * @xfer_mode: XFER_* of interest
771 * Return matching xfer_mask for @xfer_mode.
777 * Matching xfer_mask, 0 if no match found.
779 unsigned long ata_xfer_mode2mask(u8 xfer_mode)
781 const struct ata_xfer_ent *ent;
783 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
784 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
785 return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
786 & ~((1 << ent->shift) - 1);
791 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
792 * @xfer_mode: XFER_* of interest
794 * Return matching xfer_shift for @xfer_mode.
800 * Matching xfer_shift, -1 if no match found.
802 int ata_xfer_mode2shift(unsigned long xfer_mode)
804 const struct ata_xfer_ent *ent;
806 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
807 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
813 * ata_mode_string - convert xfer_mask to string
814 * @xfer_mask: mask of bits supported; only highest bit counts.
816 * Determine string which represents the highest speed
817 * (highest bit in @modemask).
823 * Constant C string representing highest speed listed in
824 * @mode_mask, or the constant C string "<n/a>".
826 const char *ata_mode_string(unsigned long xfer_mask)
828 static const char * const xfer_mode_str[] = {
852 highbit = fls(xfer_mask) - 1;
853 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
854 return xfer_mode_str[highbit];
858 static const char *sata_spd_string(unsigned int spd)
860 static const char * const spd_str[] = {
865 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
867 return spd_str[spd - 1];
870 void ata_dev_disable(struct ata_device *dev)
872 if (ata_dev_enabled(dev)) {
873 if (ata_msg_drv(dev->link->ap))
874 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
875 ata_acpi_on_disable(dev);
876 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
882 static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
884 struct ata_link *link = dev->link;
885 struct ata_port *ap = link->ap;
887 unsigned int err_mask;
891 * disallow DIPM for drivers which haven't set
892 * ATA_FLAG_IPM. This is because when DIPM is enabled,
893 * phy ready will be set in the interrupt status on
894 * state changes, which will cause some drivers to
895 * think there are errors - additionally drivers will
896 * need to disable hot plug.
898 if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
899 ap->pm_policy = NOT_AVAILABLE;
904 * For DIPM, we will only enable it for the
907 * Why? Because Disks are too stupid to know that
908 * If the host rejects a request to go to SLUMBER
909 * they should retry at PARTIAL, and instead it
910 * just would give up. So, for medium_power to
911 * work at all, we need to only allow HIPM.
913 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
919 /* no restrictions on IPM transitions */
920 scontrol &= ~(0x3 << 8);
921 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
926 if (dev->flags & ATA_DFLAG_DIPM)
927 err_mask = ata_dev_set_feature(dev,
928 SETFEATURES_SATA_ENABLE, SATA_DIPM);
931 /* allow IPM to PARTIAL */
932 scontrol &= ~(0x1 << 8);
933 scontrol |= (0x2 << 8);
934 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
939 * we don't have to disable DIPM since IPM flags
940 * disallow transitions to SLUMBER, which effectively
941 * disable DIPM if it does not support PARTIAL
945 case MAX_PERFORMANCE:
946 /* disable all IPM transitions */
947 scontrol |= (0x3 << 8);
948 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
953 * we don't have to disable DIPM since IPM flags
954 * disallow all transitions which effectively
955 * disable DIPM anyway.
960 /* FIXME: handle SET FEATURES failure */
967 * ata_dev_enable_pm - enable SATA interface power management
968 * @dev: device to enable power management
969 * @policy: the link power management policy
971 * Enable SATA Interface power management. This will enable
972 * Device Interface Power Management (DIPM) for min_power
973 * policy, and then call driver specific callbacks for
974 * enabling Host Initiated Power management.
977 * Returns: -EINVAL if IPM is not supported, 0 otherwise.
979 void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
982 struct ata_port *ap = dev->link->ap;
984 /* set HIPM first, then DIPM */
985 if (ap->ops->enable_pm)
986 rc = ap->ops->enable_pm(ap, policy);
989 rc = ata_dev_set_dipm(dev, policy);
993 ap->pm_policy = MAX_PERFORMANCE;
995 ap->pm_policy = policy;
996 return /* rc */; /* hopefully we can use 'rc' eventually */
1001 * ata_dev_disable_pm - disable SATA interface power management
1002 * @dev: device to disable power management
1004 * Disable SATA Interface power management. This will disable
1005 * Device Interface Power Management (DIPM) without changing
1006 * policy, call driver specific callbacks for disabling Host
1007 * Initiated Power management.
1012 static void ata_dev_disable_pm(struct ata_device *dev)
1014 struct ata_port *ap = dev->link->ap;
1016 ata_dev_set_dipm(dev, MAX_PERFORMANCE);
1017 if (ap->ops->disable_pm)
1018 ap->ops->disable_pm(ap);
1020 #endif /* CONFIG_PM */
1022 void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
1024 ap->pm_policy = policy;
1025 ap->link.eh_info.action |= ATA_EH_LPM;
1026 ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
1027 ata_port_schedule_eh(ap);
1031 static void ata_lpm_enable(struct ata_host *host)
1033 struct ata_link *link;
1034 struct ata_port *ap;
1035 struct ata_device *dev;
1038 for (i = 0; i < host->n_ports; i++) {
1039 ap = host->ports[i];
1040 ata_port_for_each_link(link, ap) {
1041 ata_link_for_each_dev(dev, link)
1042 ata_dev_disable_pm(dev);
1047 static void ata_lpm_disable(struct ata_host *host)
1051 for (i = 0; i < host->n_ports; i++) {
1052 struct ata_port *ap = host->ports[i];
1053 ata_lpm_schedule(ap, ap->pm_policy);
1056 #endif /* CONFIG_PM */
1059 * ata_dev_classify - determine device type based on ATA-spec signature
1060 * @tf: ATA taskfile register set for device to be identified
1062 * Determine from taskfile register contents whether a device is
1063 * ATA or ATAPI, as per "Signature and persistence" section
1064 * of ATA/PI spec (volume 1, sect 5.14).
1070 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
1071 * %ATA_DEV_UNKNOWN the event of failure.
1073 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
1075 /* Apple's open source Darwin code hints that some devices only
1076 * put a proper signature into the LBA mid/high registers,
1077 * So, we only check those. It's sufficient for uniqueness.
1079 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
1080 * signatures for ATA and ATAPI devices attached on SerialATA,
1081 * 0x3c/0xc3 and 0x69/0x96 respectively. However, SerialATA
1082 * spec has never mentioned about using different signatures
1083 * for ATA/ATAPI devices. Then, Serial ATA II: Port
1084 * Multiplier specification began to use 0x69/0x96 to identify
1085 * port multpliers and 0x3c/0xc3 to identify SEMB device.
1086 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
1087 * 0x69/0x96 shortly and described them as reserved for
1090 * We follow the current spec and consider that 0x69/0x96
1091 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
1093 if ((tf->lbam == 0) && (tf->lbah == 0)) {
1094 DPRINTK("found ATA device by sig\n");
1098 if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
1099 DPRINTK("found ATAPI device by sig\n");
1100 return ATA_DEV_ATAPI;
1103 if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
1104 DPRINTK("found PMP device by sig\n");
1108 if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
1109 printk(KERN_INFO "ata: SEMB device ignored\n");
1110 return ATA_DEV_SEMB_UNSUP; /* not yet */
1113 DPRINTK("unknown device\n");
1114 return ATA_DEV_UNKNOWN;
1118 * ata_id_string - Convert IDENTIFY DEVICE page into string
1119 * @id: IDENTIFY DEVICE results we will examine
1120 * @s: string into which data is output
1121 * @ofs: offset into identify device page
1122 * @len: length of string to return. must be an even number.
1124 * The strings in the IDENTIFY DEVICE page are broken up into
1125 * 16-bit chunks. Run through the string, and output each
1126 * 8-bit chunk linearly, regardless of platform.
1132 void ata_id_string(const u16 *id, unsigned char *s,
1133 unsigned int ofs, unsigned int len)
1152 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1153 * @id: IDENTIFY DEVICE results we will examine
1154 * @s: string into which data is output
1155 * @ofs: offset into identify device page
1156 * @len: length of string to return. must be an odd number.
1158 * This function is identical to ata_id_string except that it
1159 * trims trailing spaces and terminates the resulting string with
1160 * null. @len must be actual maximum length (even number) + 1.
1165 void ata_id_c_string(const u16 *id, unsigned char *s,
1166 unsigned int ofs, unsigned int len)
1170 WARN_ON(!(len & 1));
1172 ata_id_string(id, s, ofs, len - 1);
1174 p = s + strnlen(s, len - 1);
1175 while (p > s && p[-1] == ' ')
1180 static u64 ata_id_n_sectors(const u16 *id)
1182 if (ata_id_has_lba(id)) {
1183 if (ata_id_has_lba48(id))
1184 return ata_id_u64(id, 100);
1186 return ata_id_u32(id, 60);
1188 if (ata_id_current_chs_valid(id))
1189 return ata_id_u32(id, 57);
1191 return id[1] * id[3] * id[6];
1195 u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
1199 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
1200 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1201 sectors |= (tf->hob_lbal & 0xff) << 24;
1202 sectors |= (tf->lbah & 0xff) << 16;
1203 sectors |= (tf->lbam & 0xff) << 8;
1204 sectors |= (tf->lbal & 0xff);
1209 u64 ata_tf_to_lba(const struct ata_taskfile *tf)
1213 sectors |= (tf->device & 0x0f) << 24;
1214 sectors |= (tf->lbah & 0xff) << 16;
1215 sectors |= (tf->lbam & 0xff) << 8;
1216 sectors |= (tf->lbal & 0xff);
1222 * ata_read_native_max_address - Read native max address
1223 * @dev: target device
1224 * @max_sectors: out parameter for the result native max address
1226 * Perform an LBA48 or LBA28 native size query upon the device in
1230 * 0 on success, -EACCES if command is aborted by the drive.
1231 * -EIO on other errors.
1233 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
1235 unsigned int err_mask;
1236 struct ata_taskfile tf;
1237 int lba48 = ata_id_has_lba48(dev->id);
1239 ata_tf_init(dev, &tf);
1241 /* always clear all address registers */
1242 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1245 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
1246 tf.flags |= ATA_TFLAG_LBA48;
1248 tf.command = ATA_CMD_READ_NATIVE_MAX;
1250 tf.protocol |= ATA_PROT_NODATA;
1251 tf.device |= ATA_LBA;
1253 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1255 ata_dev_printk(dev, KERN_WARNING, "failed to read native "
1256 "max address (err_mask=0x%x)\n", err_mask);
1257 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
1263 *max_sectors = ata_tf_to_lba48(&tf) + 1;
1265 *max_sectors = ata_tf_to_lba(&tf) + 1;
1266 if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1272 * ata_set_max_sectors - Set max sectors
1273 * @dev: target device
1274 * @new_sectors: new max sectors value to set for the device
1276 * Set max sectors of @dev to @new_sectors.
1279 * 0 on success, -EACCES if command is aborted or denied (due to
1280 * previous non-volatile SET_MAX) by the drive. -EIO on other
1283 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
1285 unsigned int err_mask;
1286 struct ata_taskfile tf;
1287 int lba48 = ata_id_has_lba48(dev->id);
1291 ata_tf_init(dev, &tf);
1293 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1296 tf.command = ATA_CMD_SET_MAX_EXT;
1297 tf.flags |= ATA_TFLAG_LBA48;
1299 tf.hob_lbal = (new_sectors >> 24) & 0xff;
1300 tf.hob_lbam = (new_sectors >> 32) & 0xff;
1301 tf.hob_lbah = (new_sectors >> 40) & 0xff;
1303 tf.command = ATA_CMD_SET_MAX;
1305 tf.device |= (new_sectors >> 24) & 0xf;
1308 tf.protocol |= ATA_PROT_NODATA;
1309 tf.device |= ATA_LBA;
1311 tf.lbal = (new_sectors >> 0) & 0xff;
1312 tf.lbam = (new_sectors >> 8) & 0xff;
1313 tf.lbah = (new_sectors >> 16) & 0xff;
1315 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1317 ata_dev_printk(dev, KERN_WARNING, "failed to set "
1318 "max address (err_mask=0x%x)\n", err_mask);
1319 if (err_mask == AC_ERR_DEV &&
1320 (tf.feature & (ATA_ABORTED | ATA_IDNF)))
1329 * ata_hpa_resize - Resize a device with an HPA set
1330 * @dev: Device to resize
1332 * Read the size of an LBA28 or LBA48 disk with HPA features and resize
1333 * it if required to the full size of the media. The caller must check
1334 * the drive has the HPA feature set enabled.
1337 * 0 on success, -errno on failure.
1339 static int ata_hpa_resize(struct ata_device *dev)
1341 struct ata_eh_context *ehc = &dev->link->eh_context;
1342 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1343 u64 sectors = ata_id_n_sectors(dev->id);
1347 /* do we need to do it? */
1348 if (dev->class != ATA_DEV_ATA ||
1349 !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
1350 (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1353 /* read native max address */
1354 rc = ata_read_native_max_address(dev, &native_sectors);
1356 /* If device aborted the command or HPA isn't going to
1357 * be unlocked, skip HPA resizing.
1359 if (rc == -EACCES || !ata_ignore_hpa) {
1360 ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
1361 "broken, skipping HPA handling\n");
1362 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1364 /* we can continue if device aborted the command */
1372 /* nothing to do? */
1373 if (native_sectors <= sectors || !ata_ignore_hpa) {
1374 if (!print_info || native_sectors == sectors)
1377 if (native_sectors > sectors)
1378 ata_dev_printk(dev, KERN_INFO,
1379 "HPA detected: current %llu, native %llu\n",
1380 (unsigned long long)sectors,
1381 (unsigned long long)native_sectors);
1382 else if (native_sectors < sectors)
1383 ata_dev_printk(dev, KERN_WARNING,
1384 "native sectors (%llu) is smaller than "
1386 (unsigned long long)native_sectors,
1387 (unsigned long long)sectors);
1391 /* let's unlock HPA */
1392 rc = ata_set_max_sectors(dev, native_sectors);
1393 if (rc == -EACCES) {
1394 /* if device aborted the command, skip HPA resizing */
1395 ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
1396 "(%llu -> %llu), skipping HPA handling\n",
1397 (unsigned long long)sectors,
1398 (unsigned long long)native_sectors);
1399 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1404 /* re-read IDENTIFY data */
1405 rc = ata_dev_reread_id(dev, 0);
1407 ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
1408 "data after HPA resizing\n");
1413 u64 new_sectors = ata_id_n_sectors(dev->id);
1414 ata_dev_printk(dev, KERN_INFO,
1415 "HPA unlocked: %llu -> %llu, native %llu\n",
1416 (unsigned long long)sectors,
1417 (unsigned long long)new_sectors,
1418 (unsigned long long)native_sectors);
1425 * ata_dump_id - IDENTIFY DEVICE info debugging output
1426 * @id: IDENTIFY DEVICE page to dump
1428 * Dump selected 16-bit words from the given IDENTIFY DEVICE
1435 static inline void ata_dump_id(const u16 *id)
1437 DPRINTK("49==0x%04x "
1447 DPRINTK("80==0x%04x "
1457 DPRINTK("88==0x%04x "
1464 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1465 * @id: IDENTIFY data to compute xfer mask from
1467 * Compute the xfermask for this device. This is not as trivial
1468 * as it seems if we must consider early devices correctly.
1470 * FIXME: pre IDE drive timing (do we care ?).
1478 unsigned long ata_id_xfermask(const u16 *id)
1480 unsigned long pio_mask, mwdma_mask, udma_mask;
1482 /* Usual case. Word 53 indicates word 64 is valid */
1483 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1484 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1488 /* If word 64 isn't valid then Word 51 high byte holds
1489 * the PIO timing number for the maximum. Turn it into
1492 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1493 if (mode < 5) /* Valid PIO range */
1494 pio_mask = (2 << mode) - 1;
1498 /* But wait.. there's more. Design your standards by
1499 * committee and you too can get a free iordy field to
1500 * process. However its the speeds not the modes that
1501 * are supported... Note drivers using the timing API
1502 * will get this right anyway
1506 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1508 if (ata_id_is_cfa(id)) {
1510 * Process compact flash extended modes
1512 int pio = id[163] & 0x7;
1513 int dma = (id[163] >> 3) & 7;
1516 pio_mask |= (1 << 5);
1518 pio_mask |= (1 << 6);
1520 mwdma_mask |= (1 << 3);
1522 mwdma_mask |= (1 << 4);
1526 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1527 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1529 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1533 * ata_pio_queue_task - Queue port_task
1534 * @ap: The ata_port to queue port_task for
1535 * @fn: workqueue function to be scheduled
1536 * @data: data for @fn to use
1537 * @delay: delay time for workqueue function
1539 * Schedule @fn(@data) for execution after @delay jiffies using
1540 * port_task. There is one port_task per port and it's the
1541 * user(low level driver)'s responsibility to make sure that only
1542 * one task is active at any given time.
1544 * libata core layer takes care of synchronization between
1545 * port_task and EH. ata_pio_queue_task() may be ignored for EH
1549 * Inherited from caller.
1551 void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
1553 ap->port_task_data = data;
1555 /* may fail if ata_port_flush_task() in progress */
1556 queue_delayed_work(ata_wq, &ap->port_task, delay);
1560 * ata_port_flush_task - Flush port_task
1561 * @ap: The ata_port to flush port_task for
1563 * After this function completes, port_task is guranteed not to
1564 * be running or scheduled.
1567 * Kernel thread context (may sleep)
1569 void ata_port_flush_task(struct ata_port *ap)
1573 cancel_rearming_delayed_work(&ap->port_task);
1575 if (ata_msg_ctl(ap))
1576 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
1579 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1581 struct completion *waiting = qc->private_data;
1587 * ata_exec_internal_sg - execute libata internal command
1588 * @dev: Device to which the command is sent
1589 * @tf: Taskfile registers for the command and the result
1590 * @cdb: CDB for packet command
1591 * @dma_dir: Data tranfer direction of the command
1592 * @sgl: sg list for the data buffer of the command
1593 * @n_elem: Number of sg entries
1594 * @timeout: Timeout in msecs (0 for default)
1596 * Executes libata internal command with timeout. @tf contains
1597 * command on entry and result on return. Timeout and error
1598 * conditions are reported via return value. No recovery action
1599 * is taken after a command times out. It's caller's duty to
1600 * clean up after timeout.
1603 * None. Should be called with kernel context, might sleep.
1606 * Zero on success, AC_ERR_* mask on failure
1608 unsigned ata_exec_internal_sg(struct ata_device *dev,
1609 struct ata_taskfile *tf, const u8 *cdb,
1610 int dma_dir, struct scatterlist *sgl,
1611 unsigned int n_elem, unsigned long timeout)
1613 struct ata_link *link = dev->link;
1614 struct ata_port *ap = link->ap;
1615 u8 command = tf->command;
1616 struct ata_queued_cmd *qc;
1617 unsigned int tag, preempted_tag;
1618 u32 preempted_sactive, preempted_qc_active;
1619 int preempted_nr_active_links;
1620 DECLARE_COMPLETION_ONSTACK(wait);
1621 unsigned long flags;
1622 unsigned int err_mask;
1625 spin_lock_irqsave(ap->lock, flags);
1627 /* no internal command while frozen */
1628 if (ap->pflags & ATA_PFLAG_FROZEN) {
1629 spin_unlock_irqrestore(ap->lock, flags);
1630 return AC_ERR_SYSTEM;
1633 /* initialize internal qc */
1635 /* XXX: Tag 0 is used for drivers with legacy EH as some
1636 * drivers choke if any other tag is given. This breaks
1637 * ata_tag_internal() test for those drivers. Don't use new
1638 * EH stuff without converting to it.
1640 if (ap->ops->error_handler)
1641 tag = ATA_TAG_INTERNAL;
1645 if (test_and_set_bit(tag, &ap->qc_allocated))
1647 qc = __ata_qc_from_tag(ap, tag);
1655 preempted_tag = link->active_tag;
1656 preempted_sactive = link->sactive;
1657 preempted_qc_active = ap->qc_active;
1658 preempted_nr_active_links = ap->nr_active_links;
1659 link->active_tag = ATA_TAG_POISON;
1662 ap->nr_active_links = 0;
1664 /* prepare & issue qc */
1667 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1668 qc->flags |= ATA_QCFLAG_RESULT_TF;
1669 qc->dma_dir = dma_dir;
1670 if (dma_dir != DMA_NONE) {
1671 unsigned int i, buflen = 0;
1672 struct scatterlist *sg;
1674 for_each_sg(sgl, sg, n_elem, i)
1675 buflen += sg->length;
1677 ata_sg_init(qc, sgl, n_elem);
1678 qc->nbytes = buflen;
1681 qc->private_data = &wait;
1682 qc->complete_fn = ata_qc_complete_internal;
1686 spin_unlock_irqrestore(ap->lock, flags);
1689 timeout = ata_probe_timeout * 1000 / HZ;
1691 rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1693 ata_port_flush_task(ap);
1696 spin_lock_irqsave(ap->lock, flags);
1698 /* We're racing with irq here. If we lose, the
1699 * following test prevents us from completing the qc
1700 * twice. If we win, the port is frozen and will be
1701 * cleaned up by ->post_internal_cmd().
1703 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1704 qc->err_mask |= AC_ERR_TIMEOUT;
1706 if (ap->ops->error_handler)
1707 ata_port_freeze(ap);
1709 ata_qc_complete(qc);
1711 if (ata_msg_warn(ap))
1712 ata_dev_printk(dev, KERN_WARNING,
1713 "qc timeout (cmd 0x%x)\n", command);
1716 spin_unlock_irqrestore(ap->lock, flags);
1719 /* do post_internal_cmd */
1720 if (ap->ops->post_internal_cmd)
1721 ap->ops->post_internal_cmd(qc);
1723 /* perform minimal error analysis */
1724 if (qc->flags & ATA_QCFLAG_FAILED) {
1725 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1726 qc->err_mask |= AC_ERR_DEV;
1729 qc->err_mask |= AC_ERR_OTHER;
1731 if (qc->err_mask & ~AC_ERR_OTHER)
1732 qc->err_mask &= ~AC_ERR_OTHER;
1736 spin_lock_irqsave(ap->lock, flags);
1738 *tf = qc->result_tf;
1739 err_mask = qc->err_mask;
1742 link->active_tag = preempted_tag;
1743 link->sactive = preempted_sactive;
1744 ap->qc_active = preempted_qc_active;
1745 ap->nr_active_links = preempted_nr_active_links;
1747 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1748 * Until those drivers are fixed, we detect the condition
1749 * here, fail the command with AC_ERR_SYSTEM and reenable the
1752 * Note that this doesn't change any behavior as internal
1753 * command failure results in disabling the device in the
1754 * higher layer for LLDDs without new reset/EH callbacks.
1756 * Kill the following code as soon as those drivers are fixed.
1758 if (ap->flags & ATA_FLAG_DISABLED) {
1759 err_mask |= AC_ERR_SYSTEM;
1763 spin_unlock_irqrestore(ap->lock, flags);
1769 * ata_exec_internal - execute libata internal command
1770 * @dev: Device to which the command is sent
1771 * @tf: Taskfile registers for the command and the result
1772 * @cdb: CDB for packet command
1773 * @dma_dir: Data tranfer direction of the command
1774 * @buf: Data buffer of the command
1775 * @buflen: Length of data buffer
1776 * @timeout: Timeout in msecs (0 for default)
1778 * Wrapper around ata_exec_internal_sg() which takes simple
1779 * buffer instead of sg list.
1782 * None. Should be called with kernel context, might sleep.
1785 * Zero on success, AC_ERR_* mask on failure
1787 unsigned ata_exec_internal(struct ata_device *dev,
1788 struct ata_taskfile *tf, const u8 *cdb,
1789 int dma_dir, void *buf, unsigned int buflen,
1790 unsigned long timeout)
1792 struct scatterlist *psg = NULL, sg;
1793 unsigned int n_elem = 0;
1795 if (dma_dir != DMA_NONE) {
1797 sg_init_one(&sg, buf, buflen);
1802 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
1807 * ata_do_simple_cmd - execute simple internal command
1808 * @dev: Device to which the command is sent
1809 * @cmd: Opcode to execute
1811 * Execute a 'simple' command, that only consists of the opcode
1812 * 'cmd' itself, without filling any other registers
1815 * Kernel thread context (may sleep).
1818 * Zero on success, AC_ERR_* mask on failure
1820 unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1822 struct ata_taskfile tf;
1824 ata_tf_init(dev, &tf);
1827 tf.flags |= ATA_TFLAG_DEVICE;
1828 tf.protocol = ATA_PROT_NODATA;
1830 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1834 * ata_pio_need_iordy - check if iordy needed
1837 * Check if the current speed of the device requires IORDY. Used
1838 * by various controllers for chip configuration.
1841 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1843 /* Controller doesn't support IORDY. Probably a pointless check
1844 as the caller should know this */
1845 if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1847 /* PIO3 and higher it is mandatory */
1848 if (adev->pio_mode > XFER_PIO_2)
1850 /* We turn it on when possible */
1851 if (ata_id_has_iordy(adev->id))
1857 * ata_pio_mask_no_iordy - Return the non IORDY mask
1860 * Compute the highest mode possible if we are not using iordy. Return
1861 * -1 if no iordy mode is available.
1864 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1866 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1867 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1868 u16 pio = adev->id[ATA_ID_EIDE_PIO];
1869 /* Is the speed faster than the drive allows non IORDY ? */
1871 /* This is cycle times not frequency - watch the logic! */
1872 if (pio > 240) /* PIO2 is 240nS per cycle */
1873 return 3 << ATA_SHIFT_PIO;
1874 return 7 << ATA_SHIFT_PIO;
1877 return 3 << ATA_SHIFT_PIO;
1881 * ata_dev_read_id - Read ID data from the specified device
1882 * @dev: target device
1883 * @p_class: pointer to class of the target device (may be changed)
1884 * @flags: ATA_READID_* flags
1885 * @id: buffer to read IDENTIFY data into
1887 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1888 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1889 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1890 * for pre-ATA4 drives.
1892 * FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1893 * now we abort if we hit that case.
1896 * Kernel thread context (may sleep)
1899 * 0 on success, -errno otherwise.
1901 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1902 unsigned int flags, u16 *id)
1904 struct ata_port *ap = dev->link->ap;
1905 unsigned int class = *p_class;
1906 struct ata_taskfile tf;
1907 unsigned int err_mask = 0;
1909 int may_fallback = 1, tried_spinup = 0;
1912 if (ata_msg_ctl(ap))
1913 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
1916 ata_tf_init(dev, &tf);
1920 tf.command = ATA_CMD_ID_ATA;
1923 tf.command = ATA_CMD_ID_ATAPI;
1927 reason = "unsupported class";
1931 tf.protocol = ATA_PROT_PIO;
1933 /* Some devices choke if TF registers contain garbage. Make
1934 * sure those are properly initialized.
1936 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1938 /* Device presence detection is unreliable on some
1939 * controllers. Always poll IDENTIFY if available.
1941 tf.flags |= ATA_TFLAG_POLLING;
1943 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1944 id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1946 if (err_mask & AC_ERR_NODEV_HINT) {
1947 ata_dev_printk(dev, KERN_DEBUG,
1948 "NODEV after polling detection\n");
1952 if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
1953 /* Device or controller might have reported
1954 * the wrong device class. Give a shot at the
1955 * other IDENTIFY if the current one is
1956 * aborted by the device.
1961 if (class == ATA_DEV_ATA)
1962 class = ATA_DEV_ATAPI;
1964 class = ATA_DEV_ATA;
1968 /* Control reaches here iff the device aborted
1969 * both flavors of IDENTIFYs which happens
1970 * sometimes with phantom devices.
1972 ata_dev_printk(dev, KERN_DEBUG,
1973 "both IDENTIFYs aborted, assuming NODEV\n");
1978 reason = "I/O error";
1982 /* Falling back doesn't make sense if ID data was read
1983 * successfully at least once.
1987 swap_buf_le16(id, ATA_ID_WORDS);
1991 reason = "device reports invalid type";
1993 if (class == ATA_DEV_ATA) {
1994 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1997 if (ata_id_is_ata(id))
2001 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
2004 * Drive powered-up in standby mode, and requires a specific
2005 * SET_FEATURES spin-up subcommand before it will accept
2006 * anything other than the original IDENTIFY command.
2008 err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2009 if (err_mask && id[2] != 0x738c) {
2011 reason = "SPINUP failed";
2015 * If the drive initially returned incomplete IDENTIFY info,
2016 * we now must reissue the IDENTIFY command.
2018 if (id[2] == 0x37c8)
2022 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2024 * The exact sequence expected by certain pre-ATA4 drives is:
2026 * IDENTIFY (optional in early ATA)
2027 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2029 * Some drives were very specific about that exact sequence.
2031 * Note that ATA4 says lba is mandatory so the second check
2032 * shoud never trigger.
2034 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
2035 err_mask = ata_dev_init_params(dev, id[3], id[6]);
2038 reason = "INIT_DEV_PARAMS failed";
2042 /* current CHS translation info (id[53-58]) might be
2043 * changed. reread the identify device info.
2045 flags &= ~ATA_READID_POSTRESET;
2055 if (ata_msg_warn(ap))
2056 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
2057 "(%s, err_mask=0x%x)\n", reason, err_mask);
2061 static inline u8 ata_dev_knobble(struct ata_device *dev)
2063 struct ata_port *ap = dev->link->ap;
2064 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2067 static void ata_dev_config_ncq(struct ata_device *dev,
2068 char *desc, size_t desc_sz)
2070 struct ata_port *ap = dev->link->ap;
2071 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2073 if (!ata_id_has_ncq(dev->id)) {
2077 if (dev->horkage & ATA_HORKAGE_NONCQ) {
2078 snprintf(desc, desc_sz, "NCQ (not used)");
2081 if (ap->flags & ATA_FLAG_NCQ) {
2082 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2083 dev->flags |= ATA_DFLAG_NCQ;
2086 if (hdepth >= ddepth)
2087 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
2089 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
2093 * ata_dev_configure - Configure the specified ATA/ATAPI device
2094 * @dev: Target device to configure
2096 * Configure @dev according to @dev->id. Generic and low-level
2097 * driver specific fixups are also applied.
2100 * Kernel thread context (may sleep)
2103 * 0 on success, -errno otherwise
2105 int ata_dev_configure(struct ata_device *dev)
2107 struct ata_port *ap = dev->link->ap;
2108 struct ata_eh_context *ehc = &dev->link->eh_context;
2109 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2110 const u16 *id = dev->id;
2111 unsigned long xfer_mask;
2112 char revbuf[7]; /* XYZ-99\0 */
2113 char fwrevbuf[ATA_ID_FW_REV_LEN+1];
2114 char modelbuf[ATA_ID_PROD_LEN+1];
2117 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2118 ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2123 if (ata_msg_probe(ap))
2124 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
2127 dev->horkage |= ata_dev_blacklisted(dev);
2128 ata_force_horkage(dev);
2130 /* let ACPI work its magic */
2131 rc = ata_acpi_on_devcfg(dev);
2135 /* massage HPA, do it early as it might change IDENTIFY data */
2136 rc = ata_hpa_resize(dev);
2140 /* print device capabilities */
2141 if (ata_msg_probe(ap))
2142 ata_dev_printk(dev, KERN_DEBUG,
2143 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
2144 "85:%04x 86:%04x 87:%04x 88:%04x\n",
2146 id[49], id[82], id[83], id[84],
2147 id[85], id[86], id[87], id[88]);
2149 /* initialize to-be-configured parameters */
2150 dev->flags &= ~ATA_DFLAG_CFG_MASK;
2151 dev->max_sectors = 0;
2159 * common ATA, ATAPI feature tests
2162 /* find max transfer mode; for printk only */
2163 xfer_mask = ata_id_xfermask(id);
2165 if (ata_msg_probe(ap))
2168 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
2169 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
2172 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
2175 /* ATA-specific feature tests */
2176 if (dev->class == ATA_DEV_ATA) {
2177 if (ata_id_is_cfa(id)) {
2178 if (id[162] & 1) /* CPRM may make this media unusable */
2179 ata_dev_printk(dev, KERN_WARNING,
2180 "supports DRM functions and may "
2181 "not be fully accessable.\n");
2182 snprintf(revbuf, 7, "CFA");
2184 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2185 /* Warn the user if the device has TPM extensions */
2186 if (ata_id_has_tpm(id))
2187 ata_dev_printk(dev, KERN_WARNING,
2188 "supports DRM functions and may "
2189 "not be fully accessable.\n");
2192 dev->n_sectors = ata_id_n_sectors(id);
2194 if (dev->id[59] & 0x100)
2195 dev->multi_count = dev->id[59] & 0xff;
2197 if (ata_id_has_lba(id)) {
2198 const char *lba_desc;
2202 dev->flags |= ATA_DFLAG_LBA;
2203 if (ata_id_has_lba48(id)) {
2204 dev->flags |= ATA_DFLAG_LBA48;
2207 if (dev->n_sectors >= (1UL << 28) &&
2208 ata_id_has_flush_ext(id))
2209 dev->flags |= ATA_DFLAG_FLUSH_EXT;
2213 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
2215 /* print device info to dmesg */
2216 if (ata_msg_drv(ap) && print_info) {
2217 ata_dev_printk(dev, KERN_INFO,
2218 "%s: %s, %s, max %s\n",
2219 revbuf, modelbuf, fwrevbuf,
2220 ata_mode_string(xfer_mask));
2221 ata_dev_printk(dev, KERN_INFO,
2222 "%Lu sectors, multi %u: %s %s\n",
2223 (unsigned long long)dev->n_sectors,
2224 dev->multi_count, lba_desc, ncq_desc);
2229 /* Default translation */
2230 dev->cylinders = id[1];
2232 dev->sectors = id[6];
2234 if (ata_id_current_chs_valid(id)) {
2235 /* Current CHS translation is valid. */
2236 dev->cylinders = id[54];
2237 dev->heads = id[55];
2238 dev->sectors = id[56];
2241 /* print device info to dmesg */
2242 if (ata_msg_drv(ap) && print_info) {
2243 ata_dev_printk(dev, KERN_INFO,
2244 "%s: %s, %s, max %s\n",
2245 revbuf, modelbuf, fwrevbuf,
2246 ata_mode_string(xfer_mask));
2247 ata_dev_printk(dev, KERN_INFO,
2248 "%Lu sectors, multi %u, CHS %u/%u/%u\n",
2249 (unsigned long long)dev->n_sectors,
2250 dev->multi_count, dev->cylinders,
2251 dev->heads, dev->sectors);
2258 /* ATAPI-specific feature tests */
2259 else if (dev->class == ATA_DEV_ATAPI) {
2260 const char *cdb_intr_string = "";
2261 const char *atapi_an_string = "";
2262 const char *dma_dir_string = "";
2265 rc = atapi_cdb_len(id);
2266 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2267 if (ata_msg_warn(ap))
2268 ata_dev_printk(dev, KERN_WARNING,
2269 "unsupported CDB len\n");
2273 dev->cdb_len = (unsigned int) rc;
2275 /* Enable ATAPI AN if both the host and device have
2276 * the support. If PMP is attached, SNTF is required
2277 * to enable ATAPI AN to discern between PHY status
2278 * changed notifications and ATAPI ANs.
2280 if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
2281 (!sata_pmp_attached(ap) ||
2282 sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2283 unsigned int err_mask;
2285 /* issue SET feature command to turn this on */
2286 err_mask = ata_dev_set_feature(dev,
2287 SETFEATURES_SATA_ENABLE, SATA_AN);
2289 ata_dev_printk(dev, KERN_ERR,
2290 "failed to enable ATAPI AN "
2291 "(err_mask=0x%x)\n", err_mask);
2293 dev->flags |= ATA_DFLAG_AN;
2294 atapi_an_string = ", ATAPI AN";
2298 if (ata_id_cdb_intr(dev->id)) {
2299 dev->flags |= ATA_DFLAG_CDB_INTR;
2300 cdb_intr_string = ", CDB intr";
2303 if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
2304 dev->flags |= ATA_DFLAG_DMADIR;
2305 dma_dir_string = ", DMADIR";
2308 /* print device info to dmesg */
2309 if (ata_msg_drv(ap) && print_info)
2310 ata_dev_printk(dev, KERN_INFO,
2311 "ATAPI: %s, %s, max %s%s%s%s\n",
2313 ata_mode_string(xfer_mask),
2314 cdb_intr_string, atapi_an_string,
2318 /* determine max_sectors */
2319 dev->max_sectors = ATA_MAX_SECTORS;
2320 if (dev->flags & ATA_DFLAG_LBA48)
2321 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2323 if (!(dev->horkage & ATA_HORKAGE_IPM)) {
2324 if (ata_id_has_hipm(dev->id))
2325 dev->flags |= ATA_DFLAG_HIPM;
2326 if (ata_id_has_dipm(dev->id))
2327 dev->flags |= ATA_DFLAG_DIPM;
2330 /* Limit PATA drive on SATA cable bridge transfers to udma5,
2332 if (ata_dev_knobble(dev)) {
2333 if (ata_msg_drv(ap) && print_info)
2334 ata_dev_printk(dev, KERN_INFO,
2335 "applying bridge limits\n");
2336 dev->udma_mask &= ATA_UDMA5;
2337 dev->max_sectors = ATA_MAX_SECTORS;
2340 if ((dev->class == ATA_DEV_ATAPI) &&
2341 (atapi_command_packet_set(id) == TYPE_TAPE)) {
2342 dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2343 dev->horkage |= ATA_HORKAGE_STUCK_ERR;
2346 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2347 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2350 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
2351 dev->horkage |= ATA_HORKAGE_IPM;
2353 /* reset link pm_policy for this port to no pm */
2354 ap->pm_policy = MAX_PERFORMANCE;
2357 if (ap->ops->dev_config)
2358 ap->ops->dev_config(dev);
2360 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2361 /* Let the user know. We don't want to disallow opens for
2362 rescue purposes, or in case the vendor is just a blithering
2363 idiot. Do this after the dev_config call as some controllers
2364 with buggy firmware may want to avoid reporting false device
2368 ata_dev_printk(dev, KERN_WARNING,
2369 "Drive reports diagnostics failure. This may indicate a drive\n");
2370 ata_dev_printk(dev, KERN_WARNING,
2371 "fault or invalid emulation. Contact drive vendor for information.\n");
2378 if (ata_msg_probe(ap))
2379 ata_dev_printk(dev, KERN_DEBUG,
2380 "%s: EXIT, err\n", __func__);
2385 * ata_cable_40wire - return 40 wire cable type
2388 * Helper method for drivers which want to hardwire 40 wire cable
2392 int ata_cable_40wire(struct ata_port *ap)
2394 return ATA_CBL_PATA40;
2398 * ata_cable_80wire - return 80 wire cable type
2401 * Helper method for drivers which want to hardwire 80 wire cable
2405 int ata_cable_80wire(struct ata_port *ap)
2407 return ATA_CBL_PATA80;
2411 * ata_cable_unknown - return unknown PATA cable.
2414 * Helper method for drivers which have no PATA cable detection.
2417 int ata_cable_unknown(struct ata_port *ap)
2419 return ATA_CBL_PATA_UNK;
2423 * ata_cable_ignore - return ignored PATA cable.
2426 * Helper method for drivers which don't use cable type to limit
2429 int ata_cable_ignore(struct ata_port *ap)
2431 return ATA_CBL_PATA_IGN;
2435 * ata_cable_sata - return SATA cable type
2438 * Helper method for drivers which have SATA cables
2441 int ata_cable_sata(struct ata_port *ap)
2443 return ATA_CBL_SATA;
2447 * ata_bus_probe - Reset and probe ATA bus
2450 * Master ATA bus probing function. Initiates a hardware-dependent
2451 * bus reset, then attempts to identify any devices found on
2455 * PCI/etc. bus probe sem.
2458 * Zero on success, negative errno otherwise.
2461 int ata_bus_probe(struct ata_port *ap)
2463 unsigned int classes[ATA_MAX_DEVICES];
2464 int tries[ATA_MAX_DEVICES];
2466 struct ata_device *dev;
2470 ata_link_for_each_dev(dev, &ap->link)
2471 tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2474 ata_link_for_each_dev(dev, &ap->link) {
2475 /* If we issue an SRST then an ATA drive (not ATAPI)
2476 * may change configuration and be in PIO0 timing. If
2477 * we do a hard reset (or are coming from power on)
2478 * this is true for ATA or ATAPI. Until we've set a
2479 * suitable controller mode we should not touch the
2480 * bus as we may be talking too fast.
2482 dev->pio_mode = XFER_PIO_0;
2484 /* If the controller has a pio mode setup function
2485 * then use it to set the chipset to rights. Don't
2486 * touch the DMA setup as that will be dealt with when
2487 * configuring devices.
2489 if (ap->ops->set_piomode)
2490 ap->ops->set_piomode(ap, dev);
2493 /* reset and determine device classes */
2494 ap->ops->phy_reset(ap);
2496 ata_link_for_each_dev(dev, &ap->link) {
2497 if (!(ap->flags & ATA_FLAG_DISABLED) &&
2498 dev->class != ATA_DEV_UNKNOWN)
2499 classes[dev->devno] = dev->class;
2501 classes[dev->devno] = ATA_DEV_NONE;
2503 dev->class = ATA_DEV_UNKNOWN;
2508 /* read IDENTIFY page and configure devices. We have to do the identify
2509 specific sequence bass-ackwards so that PDIAG- is released by
2512 ata_link_for_each_dev_reverse(dev, &ap->link) {
2513 if (tries[dev->devno])
2514 dev->class = classes[dev->devno];
2516 if (!ata_dev_enabled(dev))
2519 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2525 /* Now ask for the cable type as PDIAG- should have been released */
2526 if (ap->ops->cable_detect)
2527 ap->cbl = ap->ops->cable_detect(ap);
2529 /* We may have SATA bridge glue hiding here irrespective of the
2530 reported cable types and sensed types */
2531 ata_link_for_each_dev(dev, &ap->link) {
2532 if (!ata_dev_enabled(dev))
2534 /* SATA drives indicate we have a bridge. We don't know which
2535 end of the link the bridge is which is a problem */
2536 if (ata_id_is_sata(dev->id))
2537 ap->cbl = ATA_CBL_SATA;
2540 /* After the identify sequence we can now set up the devices. We do
2541 this in the normal order so that the user doesn't get confused */
2543 ata_link_for_each_dev(dev, &ap->link) {
2544 if (!ata_dev_enabled(dev))
2547 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2548 rc = ata_dev_configure(dev);
2549 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2554 /* configure transfer mode */
2555 rc = ata_set_mode(&ap->link, &dev);
2559 ata_link_for_each_dev(dev, &ap->link)
2560 if (ata_dev_enabled(dev))
2563 /* no device present, disable port */
2564 ata_port_disable(ap);
2568 tries[dev->devno]--;
2572 /* eeek, something went very wrong, give up */
2573 tries[dev->devno] = 0;
2577 /* give it just one more chance */
2578 tries[dev->devno] = min(tries[dev->devno], 1);
2580 if (tries[dev->devno] == 1) {
2581 /* This is the last chance, better to slow
2582 * down than lose it.
2584 sata_down_spd_limit(&ap->link);
2585 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2589 if (!tries[dev->devno])
2590 ata_dev_disable(dev);
2596 * ata_port_probe - Mark port as enabled
2597 * @ap: Port for which we indicate enablement
2599 * Modify @ap data structure such that the system
2600 * thinks that the entire port is enabled.
2602 * LOCKING: host lock, or some other form of
2606 void ata_port_probe(struct ata_port *ap)
2608 ap->flags &= ~ATA_FLAG_DISABLED;
2612 * sata_print_link_status - Print SATA link status
2613 * @link: SATA link to printk link status about
2615 * This function prints link speed and status of a SATA link.
2620 void sata_print_link_status(struct ata_link *link)
2622 u32 sstatus, scontrol, tmp;
2624 if (sata_scr_read(link, SCR_STATUS, &sstatus))
2626 sata_scr_read(link, SCR_CONTROL, &scontrol);
2628 if (ata_link_online(link)) {
2629 tmp = (sstatus >> 4) & 0xf;
2630 ata_link_printk(link, KERN_INFO,
2631 "SATA link up %s (SStatus %X SControl %X)\n",
2632 sata_spd_string(tmp), sstatus, scontrol);
2634 ata_link_printk(link, KERN_INFO,
2635 "SATA link down (SStatus %X SControl %X)\n",
2641 * ata_dev_pair - return other device on cable
2644 * Obtain the other device on the same cable, or if none is
2645 * present NULL is returned
2648 struct ata_device *ata_dev_pair(struct ata_device *adev)
2650 struct ata_link *link = adev->link;
2651 struct ata_device *pair = &link->device[1 - adev->devno];
2652 if (!ata_dev_enabled(pair))
2658 * ata_port_disable - Disable port.
2659 * @ap: Port to be disabled.
2661 * Modify @ap data structure such that the system
2662 * thinks that the entire port is disabled, and should
2663 * never attempt to probe or communicate with devices
2666 * LOCKING: host lock, or some other form of
2670 void ata_port_disable(struct ata_port *ap)
2672 ap->link.device[0].class = ATA_DEV_NONE;
2673 ap->link.device[1].class = ATA_DEV_NONE;
2674 ap->flags |= ATA_FLAG_DISABLED;
2678 * sata_down_spd_limit - adjust SATA spd limit downward
2679 * @link: Link to adjust SATA spd limit for
2681 * Adjust SATA spd limit of @link downward. Note that this
2682 * function only adjusts the limit. The change must be applied
2683 * using sata_set_spd().
2686 * Inherited from caller.
2689 * 0 on success, negative errno on failure
2691 int sata_down_spd_limit(struct ata_link *link)
2693 u32 sstatus, spd, mask;
2696 if (!sata_scr_valid(link))
2699 /* If SCR can be read, use it to determine the current SPD.
2700 * If not, use cached value in link->sata_spd.
2702 rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2704 spd = (sstatus >> 4) & 0xf;
2706 spd = link->sata_spd;
2708 mask = link->sata_spd_limit;
2712 /* unconditionally mask off the highest bit */
2713 highbit = fls(mask) - 1;
2714 mask &= ~(1 << highbit);
2716 /* Mask off all speeds higher than or equal to the current
2717 * one. Force 1.5Gbps if current SPD is not available.
2720 mask &= (1 << (spd - 1)) - 1;
2724 /* were we already at the bottom? */
2728 link->sata_spd_limit = mask;
2730 ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2731 sata_spd_string(fls(mask)));
2736 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2738 struct ata_link *host_link = &link->ap->link;
2739 u32 limit, target, spd;
2741 limit = link->sata_spd_limit;
2743 /* Don't configure downstream link faster than upstream link.
2744 * It doesn't speed up anything and some PMPs choke on such
2747 if (!ata_is_host_link(link) && host_link->sata_spd)
2748 limit &= (1 << host_link->sata_spd) - 1;
2750 if (limit == UINT_MAX)
2753 target = fls(limit);
2755 spd = (*scontrol >> 4) & 0xf;
2756 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2758 return spd != target;
2762 * sata_set_spd_needed - is SATA spd configuration needed
2763 * @link: Link in question
2765 * Test whether the spd limit in SControl matches
2766 * @link->sata_spd_limit. This function is used to determine
2767 * whether hardreset is necessary to apply SATA spd
2771 * Inherited from caller.
2774 * 1 if SATA spd configuration is needed, 0 otherwise.
2776 int sata_set_spd_needed(struct ata_link *link)
2780 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2783 return __sata_set_spd_needed(link, &scontrol);
2787 * sata_set_spd - set SATA spd according to spd limit
2788 * @link: Link to set SATA spd for
2790 * Set SATA spd of @link according to sata_spd_limit.
2793 * Inherited from caller.
2796 * 0 if spd doesn't need to be changed, 1 if spd has been
2797 * changed. Negative errno if SCR registers are inaccessible.
2799 int sata_set_spd(struct ata_link *link)
2804 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2807 if (!__sata_set_spd_needed(link, &scontrol))
2810 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2817 * This mode timing computation functionality is ported over from
2818 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
2821 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
2822 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2823 * for UDMA6, which is currently supported only by Maxtor drives.
2825 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
2828 static const struct ata_timing ata_timing[] = {
2829 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
2830 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
2831 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
2832 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
2833 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
2834 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
2835 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
2836 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
2838 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
2839 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
2840 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
2842 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
2843 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
2844 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
2845 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 },
2846 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
2848 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
2849 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
2850 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
2851 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
2852 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
2853 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
2854 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
2855 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
2860 #define ENOUGH(v, unit) (((v)-1)/(unit)+1)
2861 #define EZ(v, unit) ((v)?ENOUGH(v, unit):0)
2863 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
2865 q->setup = EZ(t->setup * 1000, T);
2866 q->act8b = EZ(t->act8b * 1000, T);
2867 q->rec8b = EZ(t->rec8b * 1000, T);
2868 q->cyc8b = EZ(t->cyc8b * 1000, T);
2869 q->active = EZ(t->active * 1000, T);
2870 q->recover = EZ(t->recover * 1000, T);
2871 q->cycle = EZ(t->cycle * 1000, T);
2872 q->udma = EZ(t->udma * 1000, UT);
2875 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
2876 struct ata_timing *m, unsigned int what)
2878 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
2879 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
2880 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
2881 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
2882 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
2883 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
2884 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
2885 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
2888 const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
2890 const struct ata_timing *t = ata_timing;
2892 while (xfer_mode > t->mode)
2895 if (xfer_mode == t->mode)
2900 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
2901 struct ata_timing *t, int T, int UT)
2903 const struct ata_timing *s;
2904 struct ata_timing p;
2910 if (!(s = ata_timing_find_mode(speed)))
2913 memcpy(t, s, sizeof(*s));
2916 * If the drive is an EIDE drive, it can tell us it needs extended
2917 * PIO/MW_DMA cycle timing.
2920 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
2921 memset(&p, 0, sizeof(p));
2922 if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
2923 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
2924 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
2925 } else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
2926 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
2928 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
2932 * Convert the timing to bus clock counts.
2935 ata_timing_quantize(t, t, T, UT);
2938 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2939 * S.M.A.R.T * and some other commands. We have to ensure that the
2940 * DMA cycle timing is slower/equal than the fastest PIO timing.
2943 if (speed > XFER_PIO_6) {
2944 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
2945 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
2949 * Lengthen active & recovery time so that cycle time is correct.
2952 if (t->act8b + t->rec8b < t->cyc8b) {
2953 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
2954 t->rec8b = t->cyc8b - t->act8b;
2957 if (t->active + t->recover < t->cycle) {
2958 t->active += (t->cycle - (t->active + t->recover)) / 2;
2959 t->recover = t->cycle - t->active;
2962 /* In a few cases quantisation may produce enough errors to
2963 leave t->cycle too low for the sum of active and recovery
2964 if so we must correct this */
2965 if (t->active + t->recover > t->cycle)
2966 t->cycle = t->active + t->recover;
2972 * ata_timing_cycle2mode - find xfer mode for the specified cycle duration
2973 * @xfer_shift: ATA_SHIFT_* value for transfer type to examine.
2974 * @cycle: cycle duration in ns
2976 * Return matching xfer mode for @cycle. The returned mode is of
2977 * the transfer type specified by @xfer_shift. If @cycle is too
2978 * slow for @xfer_shift, 0xff is returned. If @cycle is faster
2979 * than the fastest known mode, the fasted mode is returned.
2985 * Matching xfer_mode, 0xff if no match found.
2987 u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
2989 u8 base_mode = 0xff, last_mode = 0xff;
2990 const struct ata_xfer_ent *ent;
2991 const struct ata_timing *t;
2993 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
2994 if (ent->shift == xfer_shift)
2995 base_mode = ent->base;
2997 for (t = ata_timing_find_mode(base_mode);
2998 t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
2999 unsigned short this_cycle;
3001 switch (xfer_shift) {
3003 case ATA_SHIFT_MWDMA:
3004 this_cycle = t->cycle;
3006 case ATA_SHIFT_UDMA:
3007 this_cycle = t->udma;
3013 if (cycle > this_cycle)
3016 last_mode = t->mode;
3023 * ata_down_xfermask_limit - adjust dev xfer masks downward
3024 * @dev: Device to adjust xfer masks
3025 * @sel: ATA_DNXFER_* selector
3027 * Adjust xfer masks of @dev downward. Note that this function
3028 * does not apply the change. Invoking ata_set_mode() afterwards
3029 * will apply the limit.
3032 * Inherited from caller.
3035 * 0 on success, negative errno on failure
3037 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3040 unsigned long orig_mask, xfer_mask;
3041 unsigned long pio_mask, mwdma_mask, udma_mask;
3044 quiet = !!(sel & ATA_DNXFER_QUIET);
3045 sel &= ~ATA_DNXFER_QUIET;
3047 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
3050 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
3053 case ATA_DNXFER_PIO:
3054 highbit = fls(pio_mask) - 1;
3055 pio_mask &= ~(1 << highbit);
3058 case ATA_DNXFER_DMA:
3060 highbit = fls(udma_mask) - 1;
3061 udma_mask &= ~(1 << highbit);
3064 } else if (mwdma_mask) {
3065 highbit = fls(mwdma_mask) - 1;
3066 mwdma_mask &= ~(1 << highbit);
3072 case ATA_DNXFER_40C:
3073 udma_mask &= ATA_UDMA_MASK_40C;
3076 case ATA_DNXFER_FORCE_PIO0:
3078 case ATA_DNXFER_FORCE_PIO:
3087 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
3089 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
3093 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
3094 snprintf(buf, sizeof(buf), "%s:%s",
3095 ata_mode_string(xfer_mask),
3096 ata_mode_string(xfer_mask & ATA_MASK_PIO));
3098 snprintf(buf, sizeof(buf), "%s",
3099 ata_mode_string(xfer_mask));
3101 ata_dev_printk(dev, KERN_WARNING,
3102 "limiting speed to %s\n", buf);
3105 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
3111 static int ata_dev_set_mode(struct ata_device *dev)
3113 struct ata_eh_context *ehc = &dev->link->eh_context;
3114 const char *dev_err_whine = "";
3115 int ign_dev_err = 0;
3116 unsigned int err_mask;
3119 dev->flags &= ~ATA_DFLAG_PIO;
3120 if (dev->xfer_shift == ATA_SHIFT_PIO)
3121 dev->flags |= ATA_DFLAG_PIO;
3123 err_mask = ata_dev_set_xfermode(dev);
3125 if (err_mask & ~AC_ERR_DEV)
3129 ehc->i.flags |= ATA_EHI_POST_SETMODE;
3130 rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3131 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3135 /* Old CFA may refuse this command, which is just fine */
3136 if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
3139 /* Some very old devices and some bad newer ones fail any kind of
3140 SET_XFERMODE request but support PIO0-2 timings and no IORDY */
3141 if (dev->xfer_shift == ATA_SHIFT_PIO && !ata_id_has_iordy(dev->id) &&
3142 dev->pio_mode <= XFER_PIO_2)
3145 /* Early MWDMA devices do DMA but don't allow DMA mode setting.
3146 Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3147 if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3148 dev->dma_mode == XFER_MW_DMA_0 &&
3149 (dev->id[63] >> 8) & 1)
3152 /* if the device is actually configured correctly, ignore dev err */
3153 if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
3156 if (err_mask & AC_ERR_DEV) {
3160 dev_err_whine = " (device error ignored)";
3163 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
3164 dev->xfer_shift, (int)dev->xfer_mode);
3166 ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
3167 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
3173 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
3174 "(err_mask=0x%x)\n", err_mask);
3179 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3180 * @link: link on which timings will be programmed
3181 * @r_failed_dev: out parameter for failed device
3183 * Standard implementation of the function used to tune and set
3184 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3185 * ata_dev_set_mode() fails, pointer to the failing device is
3186 * returned in @r_failed_dev.
3189 * PCI/etc. bus probe sem.
3192 * 0 on success, negative errno otherwise
3195 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3197 struct ata_port *ap = link->ap;
3198 struct ata_device *dev;
3199 int rc = 0, used_dma = 0, found = 0;
3201 /* step 1: calculate xfer_mask */
3202 ata_link_for_each_dev(dev, link) {
3203 unsigned long pio_mask, dma_mask;
3204 unsigned int mode_mask;
3206 if (!ata_dev_enabled(dev))
3209 mode_mask = ATA_DMA_MASK_ATA;
3210 if (dev->class == ATA_DEV_ATAPI)
3211 mode_mask = ATA_DMA_MASK_ATAPI;
3212 else if (ata_id_is_cfa(dev->id))
3213 mode_mask = ATA_DMA_MASK_CFA;
3215 ata_dev_xfermask(dev);
3216 ata_force_xfermask(dev);
3218 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3219 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3221 if (libata_dma_mask & mode_mask)
3222 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3226 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
3227 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3230 if (dev->dma_mode != 0xff)
3236 /* step 2: always set host PIO timings */
3237 ata_link_for_each_dev(dev, link) {
3238 if (!ata_dev_enabled(dev))
3241 if (dev->pio_mode == 0xff) {
3242 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3247 dev->xfer_mode = dev->pio_mode;
3248 dev->xfer_shift = ATA_SHIFT_PIO;
3249 if (ap->ops->set_piomode)
3250 ap->ops->set_piomode(ap, dev);
3253 /* step 3: set host DMA timings */
3254 ata_link_for_each_dev(dev, link) {
3255 if (!ata_dev_enabled(dev) || dev->dma_mode == 0xff)
3258 dev->xfer_mode = dev->dma_mode;
3259 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
3260 if (ap->ops->set_dmamode)
3261 ap->ops->set_dmamode(ap, dev);
3264 /* step 4: update devices' xfer mode */
3265 ata_link_for_each_dev(dev, link) {
3266 /* don't update suspended devices' xfer mode */
3267 if (!ata_dev_enabled(dev))
3270 rc = ata_dev_set_mode(dev);
3275 /* Record simplex status. If we selected DMA then the other
3276 * host channels are not permitted to do so.
3278 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
3279 ap->host->simplex_claimed = ap;
3283 *r_failed_dev = dev;
3288 * ata_wait_ready - wait for link to become ready
3289 * @link: link to be waited on
3290 * @deadline: deadline jiffies for the operation
3291 * @check_ready: callback to check link readiness
3293 * Wait for @link to become ready. @check_ready should return
3294 * positive number if @link is ready, 0 if it isn't, -ENODEV if
3295 * link doesn't seem to be occupied, other errno for other error
3298 * Transient -ENODEV conditions are allowed for
3299 * ATA_TMOUT_FF_WAIT.
3305 * 0 if @linke is ready before @deadline; otherwise, -errno.
3307 int ata_wait_ready(struct ata_link *link, unsigned long deadline,
3308 int (*check_ready)(struct ata_link *link))
3310 unsigned long start = jiffies;
3311 unsigned long nodev_deadline = start + ATA_TMOUT_FF_WAIT;
3314 if (time_after(nodev_deadline, deadline))
3315 nodev_deadline = deadline;
3318 unsigned long now = jiffies;
3321 ready = tmp = check_ready(link);
3325 /* -ENODEV could be transient. Ignore -ENODEV if link
3326 * is online. Also, some SATA devices take a long
3327 * time to clear 0xff after reset. For example,
3328 * HHD424020F7SV00 iVDR needs >= 800ms while Quantum
3329 * GoVault needs even more than that. Wait for
3330 * ATA_TMOUT_FF_WAIT on -ENODEV if link isn't offline.
3332 * Note that some PATA controllers (pata_ali) explode
3333 * if status register is read more than once when
3334 * there's no device attached.
3336 if (ready == -ENODEV) {
3337 if (ata_link_online(link))
3339 else if ((link->ap->flags & ATA_FLAG_SATA) &&
3340 !ata_link_offline(link) &&
3341 time_before(now, nodev_deadline))
3347 if (time_after(now, deadline))
3350 if (!warned && time_after(now, start + 5 * HZ) &&
3351 (deadline - now > 3 * HZ)) {
3352 ata_link_printk(link, KERN_WARNING,
3353 "link is slow to respond, please be patient "
3354 "(ready=%d)\n", tmp);
3363 * ata_wait_after_reset - wait for link to become ready after reset
3364 * @link: link to be waited on
3365 * @deadline: deadline jiffies for the operation
3366 * @check_ready: callback to check link readiness
3368 * Wait for @link to become ready after reset.
3374 * 0 if @linke is ready before @deadline; otherwise, -errno.
3376 extern int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3377 int (*check_ready)(struct ata_link *link))
3379 msleep(ATA_WAIT_AFTER_RESET_MSECS);
3381 return ata_wait_ready(link, deadline, check_ready);
3385 * sata_link_debounce - debounce SATA phy status
3386 * @link: ATA link to debounce SATA phy status for
3387 * @params: timing parameters { interval, duratinon, timeout } in msec
3388 * @deadline: deadline jiffies for the operation
3390 * Make sure SStatus of @link reaches stable state, determined by
3391 * holding the same value where DET is not 1 for @duration polled
3392 * every @interval, before @timeout. Timeout constraints the
3393 * beginning of the stable state. Because DET gets stuck at 1 on
3394 * some controllers after hot unplugging, this functions waits
3395 * until timeout then returns 0 if DET is stable at 1.
3397 * @timeout is further limited by @deadline. The sooner of the
3401 * Kernel thread context (may sleep)
3404 * 0 on success, -errno on failure.
3406 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3407 unsigned long deadline)
3409 unsigned long interval_msec = params[0];
3410 unsigned long duration = msecs_to_jiffies(params[1]);
3411 unsigned long last_jiffies, t;
3415 t = jiffies + msecs_to_jiffies(params[2]);
3416 if (time_before(t, deadline))
3419 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3424 last_jiffies = jiffies;
3427 msleep(interval_msec);
3428 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3434 if (cur == 1 && time_before(jiffies, deadline))
3436 if (time_after(jiffies, last_jiffies + duration))
3441 /* unstable, start over */
3443 last_jiffies = jiffies;
3445 /* Check deadline. If debouncing failed, return
3446 * -EPIPE to tell upper layer to lower link speed.
3448 if (time_after(jiffies, deadline))
3454 * sata_link_resume - resume SATA link
3455 * @link: ATA link to resume SATA
3456 * @params: timing parameters { interval, duratinon, timeout } in msec
3457 * @deadline: deadline jiffies for the operation
3459 * Resume SATA phy @link and debounce it.
3462 * Kernel thread context (may sleep)
3465 * 0 on success, -errno on failure.
3467 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3468 unsigned long deadline)
3470 u32 scontrol, serror;
3473 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3476 scontrol = (scontrol & 0x0f0) | 0x300;
3478 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3481 /* Some PHYs react badly if SStatus is pounded immediately
3482 * after resuming. Delay 200ms before debouncing.
3486 if ((rc = sata_link_debounce(link, params, deadline)))
3489 /* Clear SError. PMP and some host PHYs require this to
3490 * operate and clearing should be done before checking PHY
3491 * online status to avoid race condition (hotplugging between
3492 * link resume and status check).
3494 if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
3495 rc = sata_scr_write(link, SCR_ERROR, serror);
3496 if (rc == 0 || rc == -EINVAL) {
3497 unsigned long flags;
3499 spin_lock_irqsave(link->ap->lock, flags);
3500 link->eh_info.serror = 0;
3501 spin_unlock_irqrestore(link->ap->lock, flags);
3508 * ata_std_prereset - prepare for reset
3509 * @link: ATA link to be reset
3510 * @deadline: deadline jiffies for the operation
3512 * @link is about to be reset. Initialize it. Failure from
3513 * prereset makes libata abort whole reset sequence and give up
3514 * that port, so prereset should be best-effort. It does its
3515 * best to prepare for reset sequence but if things go wrong, it
3516 * should just whine, not fail.
3519 * Kernel thread context (may sleep)
3522 * 0 on success, -errno otherwise.
3524 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3526 struct ata_port *ap = link->ap;
3527 struct ata_eh_context *ehc = &link->eh_context;
3528 const unsigned long *timing = sata_ehc_deb_timing(ehc);
3531 /* if we're about to do hardreset, nothing more to do */
3532 if (ehc->i.action & ATA_EH_HARDRESET)
3535 /* if SATA, resume link */
3536 if (ap->flags & ATA_FLAG_SATA) {
3537 rc = sata_link_resume(link, timing, deadline);
3538 /* whine about phy resume failure but proceed */
3539 if (rc && rc != -EOPNOTSUPP)
3540 ata_link_printk(link, KERN_WARNING, "failed to resume "
3541 "link for reset (errno=%d)\n", rc);
3544 /* no point in trying softreset on offline link */
3545 if (ata_link_offline(link))
3546 ehc->i.action &= ~ATA_EH_SOFTRESET;
3552 * sata_link_hardreset - reset link via SATA phy reset
3553 * @link: link to reset
3554 * @timing: timing parameters { interval, duratinon, timeout } in msec
3555 * @deadline: deadline jiffies for the operation
3556 * @online: optional out parameter indicating link onlineness
3557 * @check_ready: optional callback to check link readiness
3559 * SATA phy-reset @link using DET bits of SControl register.
3560 * After hardreset, link readiness is waited upon using
3561 * ata_wait_ready() if @check_ready is specified. LLDs are
3562 * allowed to not specify @check_ready and wait itself after this
3563 * function returns. Device classification is LLD's
3566 * *@online is set to one iff reset succeeded and @link is online
3570 * Kernel thread context (may sleep)
3573 * 0 on success, -errno otherwise.
3575 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3576 unsigned long deadline,
3577 bool *online, int (*check_ready)(struct ata_link *))
3587 if (sata_set_spd_needed(link)) {
3588 /* SATA spec says nothing about how to reconfigure
3589 * spd. To be on the safe side, turn off phy during
3590 * reconfiguration. This works for at least ICH7 AHCI
3593 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3596 scontrol = (scontrol & 0x0f0) | 0x304;
3598 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3604 /* issue phy wake/reset */
3605 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3608 scontrol = (scontrol & 0x0f0) | 0x301;
3610 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3613 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3614 * 10.4.2 says at least 1 ms.
3618 /* bring link back */
3619 rc = sata_link_resume(link, timing, deadline);
3622 /* if link is offline nothing more to do */
3623 if (ata_link_offline(link))
3626 /* Link is online. From this point, -ENODEV too is an error. */
3630 if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3631 /* If PMP is supported, we have to do follow-up SRST.
3632 * Some PMPs don't send D2H Reg FIS after hardreset if
3633 * the first port is empty. Wait only for
3634 * ATA_TMOUT_PMP_SRST_WAIT.
3637 unsigned long pmp_deadline;
3639 pmp_deadline = jiffies + ATA_TMOUT_PMP_SRST_WAIT;
3640 if (time_after(pmp_deadline, deadline))
3641 pmp_deadline = deadline;
3642 ata_wait_ready(link, pmp_deadline, check_ready);
3650 rc = ata_wait_ready(link, deadline, check_ready);
3652 if (rc && rc != -EAGAIN)
3653 ata_link_printk(link, KERN_ERR,
3654 "COMRESET failed (errno=%d)\n", rc);
3655 DPRINTK("EXIT, rc=%d\n", rc);
3660 * sata_std_hardreset - COMRESET w/o waiting or classification
3661 * @link: link to reset
3662 * @class: resulting class of attached device
3663 * @deadline: deadline jiffies for the operation
3665 * Standard SATA COMRESET w/o waiting or classification.
3668 * Kernel thread context (may sleep)
3671 * 0 if link offline, -EAGAIN if link online, -errno on errors.
3673 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3674 unsigned long deadline)
3676 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3681 rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
3682 return online ? -EAGAIN : rc;
3686 * ata_std_postreset - standard postreset callback
3687 * @link: the target ata_link
3688 * @classes: classes of attached devices
3690 * This function is invoked after a successful reset. Note that
3691 * the device might have been reset more than once using
3692 * different reset methods before postreset is invoked.
3695 * Kernel thread context (may sleep)
3697 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3701 /* print link status */
3702 sata_print_link_status(link);
3708 * ata_dev_same_device - Determine whether new ID matches configured device
3709 * @dev: device to compare against
3710 * @new_class: class of the new device
3711 * @new_id: IDENTIFY page of the new device
3713 * Compare @new_class and @new_id against @dev and determine
3714 * whether @dev is the device indicated by @new_class and
3721 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
3723 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
3726 const u16 *old_id = dev->id;
3727 unsigned char model[2][ATA_ID_PROD_LEN + 1];
3728 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3730 if (dev->class != new_class) {
3731 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
3732 dev->class, new_class);
3736 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
3737 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
3738 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
3739 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3741 if (strcmp(model[0], model[1])) {
3742 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
3743 "'%s' != '%s'\n", model[0], model[1]);
3747 if (strcmp(serial[0], serial[1])) {
3748 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
3749 "'%s' != '%s'\n", serial[0], serial[1]);
3757 * ata_dev_reread_id - Re-read IDENTIFY data
3758 * @dev: target ATA device
3759 * @readid_flags: read ID flags
3761 * Re-read IDENTIFY page and make sure @dev is still attached to
3765 * Kernel thread context (may sleep)
3768 * 0 on success, negative errno otherwise
3770 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3772 unsigned int class = dev->class;
3773 u16 *id = (void *)dev->link->ap->sector_buf;
3777 rc = ata_dev_read_id(dev, &class, readid_flags, id);
3781 /* is the device still there? */
3782 if (!ata_dev_same_device(dev, class, id))
3785 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3790 * ata_dev_revalidate - Revalidate ATA device
3791 * @dev: device to revalidate
3792 * @new_class: new class code
3793 * @readid_flags: read ID flags
3795 * Re-read IDENTIFY page, make sure @dev is still attached to the
3796 * port and reconfigure it according to the new IDENTIFY page.
3799 * Kernel thread context (may sleep)
3802 * 0 on success, negative errno otherwise
3804 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
3805 unsigned int readid_flags)
3807 u64 n_sectors = dev->n_sectors;
3810 if (!ata_dev_enabled(dev))
3813 /* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
3814 if (ata_class_enabled(new_class) &&
3815 new_class != ATA_DEV_ATA && new_class != ATA_DEV_ATAPI) {
3816 ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
3817 dev->class, new_class);
3823 rc = ata_dev_reread_id(dev, readid_flags);
3827 /* configure device according to the new ID */
3828 rc = ata_dev_configure(dev);
3832 /* verify n_sectors hasn't changed */
3833 if (dev->class == ATA_DEV_ATA && n_sectors &&
3834 dev->n_sectors != n_sectors) {
3835 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
3837 (unsigned long long)n_sectors,
3838 (unsigned long long)dev->n_sectors);
3840 /* restore original n_sectors */
3841 dev->n_sectors = n_sectors;
3850 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3854 struct ata_blacklist_entry {
3855 const char *model_num;
3856 const char *model_rev;
3857 unsigned long horkage;
3860 static const struct ata_blacklist_entry ata_device_blacklist [] = {
3861 /* Devices with DMA related problems under Linux */
3862 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
3863 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
3864 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
3865 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
3866 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
3867 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
3868 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
3869 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
3870 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
3871 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
3872 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
3873 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
3874 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
3875 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
3876 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
3877 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
3878 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
3879 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
3880 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
3881 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
3882 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
3883 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
3884 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
3885 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
3886 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
3887 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
3888 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
3889 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
3890 { "SAMSUNG CD-ROM SN-124", "N001", ATA_HORKAGE_NODMA },
3891 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA },
3892 /* Odd clown on sil3726/4726 PMPs */
3893 { "Config Disk", NULL, ATA_HORKAGE_NODMA |
3894 ATA_HORKAGE_SKIP_PM },
3896 /* Weird ATAPI devices */
3897 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
3899 /* Devices we expect to fail diagnostics */
3901 /* Devices where NCQ should be avoided */
3903 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
3904 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, },
3905 /* http://thread.gmane.org/gmane.linux.ide/14907 */
3906 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ },
3908 { "Maxtor *", "BANC*", ATA_HORKAGE_NONCQ },
3909 { "Maxtor 7V300F0", "VA111630", ATA_HORKAGE_NONCQ },
3910 { "ST380817AS", "3.42", ATA_HORKAGE_NONCQ },
3911 { "ST3160023AS", "3.42", ATA_HORKAGE_NONCQ },
3913 /* Blacklist entries taken from Silicon Image 3124/3132
3914 Windows driver .inf file - also several Linux problem reports */
3915 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, },
3916 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, },
3917 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, },
3919 /* devices which puke on READ_NATIVE_MAX */
3920 { "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, },
3921 { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
3922 { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
3923 { "MAXTOR 6L080L4", "A93.0500", ATA_HORKAGE_BROKEN_HPA },
3925 /* Devices which report 1 sector over size HPA */
3926 { "ST340823A", NULL, ATA_HORKAGE_HPA_SIZE, },
3927 { "ST320413A", NULL, ATA_HORKAGE_HPA_SIZE, },
3928 { "ST310211A", NULL, ATA_HORKAGE_HPA_SIZE, },
3930 /* Devices which get the IVB wrong */
3931 { "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
3932 { "TSSTcorp CDDVDW SH-S202J", "SB00", ATA_HORKAGE_IVB, },
3933 { "TSSTcorp CDDVDW SH-S202J", "SB01", ATA_HORKAGE_IVB, },
3934 { "TSSTcorp CDDVDW SH-S202N", "SB00", ATA_HORKAGE_IVB, },
3935 { "TSSTcorp CDDVDW SH-S202N", "SB01", ATA_HORKAGE_IVB, },
3941 static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
3947 * check for trailing wildcard: *\0
3949 p = strchr(patt, wildchar);
3950 if (p && ((*(p + 1)) == 0))
3961 return strncmp(patt, name, len);
3964 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
3966 unsigned char model_num[ATA_ID_PROD_LEN + 1];
3967 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3968 const struct ata_blacklist_entry *ad = ata_device_blacklist;
3970 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
3971 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
3973 while (ad->model_num) {
3974 if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
3975 if (ad->model_rev == NULL)
3977 if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
3985 static int ata_dma_blacklisted(const struct ata_device *dev)
3987 /* We don't support polling DMA.
3988 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
3989 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
3991 if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
3992 (dev->flags & ATA_DFLAG_CDB_INTR))
3994 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
3998 * ata_is_40wire - check drive side detection
4001 * Perform drive side detection decoding, allowing for device vendors
4002 * who can't follow the documentation.
4005 static int ata_is_40wire(struct ata_device *dev)
4007 if (dev->horkage & ATA_HORKAGE_IVB)
4008 return ata_drive_40wire_relaxed(dev->id);
4009 return ata_drive_40wire(dev->id);
4013 * cable_is_40wire - 40/80/SATA decider
4014 * @ap: port to consider
4016 * This function encapsulates the policy for speed management
4017 * in one place. At the moment we don't cache the result but
4018 * there is a good case for setting ap->cbl to the result when
4019 * we are called with unknown cables (and figuring out if it
4020 * impacts hotplug at all).
4022 * Return 1 if the cable appears to be 40 wire.
4025 static int cable_is_40wire(struct ata_port *ap)
4027 struct ata_link *link;
4028 struct ata_device *dev;
4030 /* If the controller thinks we are 40 wire, we are */
4031 if (ap->cbl == ATA_CBL_PATA40)
4033 /* If the controller thinks we are 80 wire, we are */
4034 if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
4036 /* If the controller doesn't know we scan
4038 - Note: We look for all 40 wire detects at this point.
4039 Any 80 wire detect is taken to be 80 wire cable
4041 - In many setups only the one drive (slave if present)
4042 will give a valid detect
4043 - If you have a non detect capable drive you don't
4044 want it to colour the choice
4046 ata_port_for_each_link(link, ap) {
4047 ata_link_for_each_dev(dev, link) {
4048 if (!ata_is_40wire(dev))
4056 * ata_dev_xfermask - Compute supported xfermask of the given device
4057 * @dev: Device to compute xfermask for
4059 * Compute supported xfermask of @dev and store it in
4060 * dev->*_mask. This function is responsible for applying all
4061 * known limits including host controller limits, device
4067 static void ata_dev_xfermask(struct ata_device *dev)
4069 struct ata_link *link = dev->link;
4070 struct ata_port *ap = link->ap;
4071 struct ata_host *host = ap->host;
4072 unsigned long xfer_mask;
4074 /* controller modes available */
4075 xfer_mask = ata_pack_xfermask(ap->pio_mask,
4076 ap->mwdma_mask, ap->udma_mask);
4078 /* drive modes available */
4079 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
4080 dev->mwdma_mask, dev->udma_mask);
4081 xfer_mask &= ata_id_xfermask(dev->id);
4084 * CFA Advanced TrueIDE timings are not allowed on a shared
4087 if (ata_dev_pair(dev)) {
4088 /* No PIO5 or PIO6 */
4089 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
4090 /* No MWDMA3 or MWDMA 4 */
4091 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
4094 if (ata_dma_blacklisted(dev)) {
4095 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4096 ata_dev_printk(dev, KERN_WARNING,
4097 "device is on DMA blacklist, disabling DMA\n");
4100 if ((host->flags & ATA_HOST_SIMPLEX) &&
4101 host->simplex_claimed && host->simplex_claimed != ap) {
4102 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4103 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
4104 "other device, disabling DMA\n");
4107 if (ap->flags & ATA_FLAG_NO_IORDY)
4108 xfer_mask &= ata_pio_mask_no_iordy(dev);
4110 if (ap->ops->mode_filter)
4111 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4113 /* Apply cable rule here. Don't apply it early because when
4114 * we handle hot plug the cable type can itself change.
4115 * Check this last so that we know if the transfer rate was
4116 * solely limited by the cable.
4117 * Unknown or 80 wire cables reported host side are checked
4118 * drive side as well. Cases where we know a 40wire cable
4119 * is used safely for 80 are not checked here.
4121 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
4122 /* UDMA/44 or higher would be available */
4123 if (cable_is_40wire(ap)) {
4124 ata_dev_printk(dev, KERN_WARNING,
4125 "limited to UDMA/33 due to 40-wire cable\n");
4126 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
4129 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
4130 &dev->mwdma_mask, &dev->udma_mask);
4134 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
4135 * @dev: Device to which command will be sent
4137 * Issue SET FEATURES - XFER MODE command to device @dev
4141 * PCI/etc. bus probe sem.
4144 * 0 on success, AC_ERR_* mask otherwise.
4147 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
4149 struct ata_taskfile tf;
4150 unsigned int err_mask;
4152 /* set up set-features taskfile */
4153 DPRINTK("set features - xfer mode\n");
4155 /* Some controllers and ATAPI devices show flaky interrupt
4156 * behavior after setting xfer mode. Use polling instead.
4158 ata_tf_init(dev, &tf);
4159 tf.command = ATA_CMD_SET_FEATURES;
4160 tf.feature = SETFEATURES_XFER;
4161 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4162 tf.protocol = ATA_PROT_NODATA;
4163 /* If we are using IORDY we must send the mode setting command */
4164 if (ata_pio_need_iordy(dev))
4165 tf.nsect = dev->xfer_mode;
4166 /* If the device has IORDY and the controller does not - turn it off */
4167 else if (ata_id_has_iordy(dev->id))
4169 else /* In the ancient relic department - skip all of this */
4172 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4174 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4178 * ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4179 * @dev: Device to which command will be sent
4180 * @enable: Whether to enable or disable the feature
4181 * @feature: The sector count represents the feature to set
4183 * Issue SET FEATURES - SATA FEATURES command to device @dev
4184 * on port @ap with sector count
4187 * PCI/etc. bus probe sem.
4190 * 0 on success, AC_ERR_* mask otherwise.
4192 static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
4195 struct ata_taskfile tf;
4196 unsigned int err_mask;
4198 /* set up set-features taskfile */
4199 DPRINTK("set features - SATA features\n");
4201 ata_tf_init(dev, &tf);
4202 tf.command = ATA_CMD_SET_FEATURES;
4203 tf.feature = enable;
4204 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4205 tf.protocol = ATA_PROT_NODATA;
4208 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4210 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4215 * ata_dev_init_params - Issue INIT DEV PARAMS command
4216 * @dev: Device to which command will be sent
4217 * @heads: Number of heads (taskfile parameter)
4218 * @sectors: Number of sectors (taskfile parameter)
4221 * Kernel thread context (may sleep)
4224 * 0 on success, AC_ERR_* mask otherwise.
4226 static unsigned int ata_dev_init_params(struct ata_device *dev,
4227 u16 heads, u16 sectors)
4229 struct ata_taskfile tf;
4230 unsigned int err_mask;
4232 /* Number of sectors per track 1-255. Number of heads 1-16 */
4233 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4234 return AC_ERR_INVALID;
4236 /* set up init dev params taskfile */
4237 DPRINTK("init dev params \n");
4239 ata_tf_init(dev, &tf);
4240 tf.command = ATA_CMD_INIT_DEV_PARAMS;
4241 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4242 tf.protocol = ATA_PROT_NODATA;
4244 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4246 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4247 /* A clean abort indicates an original or just out of spec drive
4248 and we should continue as we issue the setup based on the
4249 drive reported working geometry */
4250 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4253 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4258 * ata_sg_clean - Unmap DMA memory associated with command
4259 * @qc: Command containing DMA memory to be released
4261 * Unmap all mapped DMA memory associated with this command.
4264 * spin_lock_irqsave(host lock)
4266 void ata_sg_clean(struct ata_queued_cmd *qc)
4268 struct ata_port *ap = qc->ap;
4269 struct scatterlist *sg = qc->sg;
4270 int dir = qc->dma_dir;
4272 WARN_ON(sg == NULL);
4274 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
4277 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4279 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4284 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
4285 * @qc: Metadata associated with taskfile to check
4287 * Allow low-level driver to filter ATA PACKET commands, returning
4288 * a status indicating whether or not it is OK to use DMA for the
4289 * supplied PACKET command.
4292 * spin_lock_irqsave(host lock)
4294 * RETURNS: 0 when ATAPI DMA can be used
4297 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
4299 struct ata_port *ap = qc->ap;
4301 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a
4302 * few ATAPI devices choke on such DMA requests.
4304 if (unlikely(qc->nbytes & 15))
4307 if (ap->ops->check_atapi_dma)
4308 return ap->ops->check_atapi_dma(qc);
4314 * ata_std_qc_defer - Check whether a qc needs to be deferred
4315 * @qc: ATA command in question
4317 * Non-NCQ commands cannot run with any other command, NCQ or
4318 * not. As upper layer only knows the queue depth, we are
4319 * responsible for maintaining exclusion. This function checks
4320 * whether a new command @qc can be issued.
4323 * spin_lock_irqsave(host lock)
4326 * ATA_DEFER_* if deferring is needed, 0 otherwise.
4328 int ata_std_qc_defer(struct ata_queued_cmd *qc)
4330 struct ata_link *link = qc->dev->link;
4332 if (qc->tf.protocol == ATA_PROT_NCQ) {
4333 if (!ata_tag_valid(link->active_tag))
4336 if (!ata_tag_valid(link->active_tag) && !link->sactive)
4340 return ATA_DEFER_LINK;
4343 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4346 * ata_sg_init - Associate command with scatter-gather table.
4347 * @qc: Command to be associated
4348 * @sg: Scatter-gather table.
4349 * @n_elem: Number of elements in s/g table.
4351 * Initialize the data-related elements of queued_cmd @qc
4352 * to point to a scatter-gather table @sg, containing @n_elem
4356 * spin_lock_irqsave(host lock)
4358 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4359 unsigned int n_elem)
4362 qc->n_elem = n_elem;
4367 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
4368 * @qc: Command with scatter-gather table to be mapped.
4370 * DMA-map the scatter-gather table associated with queued_cmd @qc.
4373 * spin_lock_irqsave(host lock)
4376 * Zero on success, negative on error.
4379 static int ata_sg_setup(struct ata_queued_cmd *qc)
4381 struct ata_port *ap = qc->ap;
4382 unsigned int n_elem;
4384 VPRINTK("ENTER, ata%u\n", ap->print_id);
4386 n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
4390 DPRINTK("%d sg elements mapped\n", n_elem);
4392 qc->n_elem = n_elem;
4393 qc->flags |= ATA_QCFLAG_DMAMAP;
4399 * swap_buf_le16 - swap halves of 16-bit words in place
4400 * @buf: Buffer to swap
4401 * @buf_words: Number of 16-bit words in buffer.
4403 * Swap halves of 16-bit words if needed to convert from
4404 * little-endian byte order to native cpu byte order, or
4408 * Inherited from caller.
4410 void swap_buf_le16(u16 *buf, unsigned int buf_words)
4415 for (i = 0; i < buf_words; i++)
4416 buf[i] = le16_to_cpu(buf[i]);
4417 #endif /* __BIG_ENDIAN */
4421 * ata_qc_new - Request an available ATA command, for queueing
4422 * @ap: Port associated with device @dev
4423 * @dev: Device from whom we request an available command structure
4429 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4431 struct ata_queued_cmd *qc = NULL;
4434 /* no command while frozen */
4435 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4438 /* the last tag is reserved for internal command. */
4439 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4440 if (!test_and_set_bit(i, &ap->qc_allocated)) {
4441 qc = __ata_qc_from_tag(ap, i);
4452 * ata_qc_new_init - Request an available ATA command, and initialize it
4453 * @dev: Device from whom we request an available command structure
4459 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
4461 struct ata_port *ap = dev->link->ap;
4462 struct ata_queued_cmd *qc;
4464 qc = ata_qc_new(ap);
4477 * ata_qc_free - free unused ata_queued_cmd
4478 * @qc: Command to complete
4480 * Designed to free unused ata_queued_cmd object
4481 * in case something prevents using it.
4484 * spin_lock_irqsave(host lock)
4486 void ata_qc_free(struct ata_queued_cmd *qc)
4488 struct ata_port *ap = qc->ap;
4491 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4495 if (likely(ata_tag_valid(tag))) {
4496 qc->tag = ATA_TAG_POISON;
4497 clear_bit(tag, &ap->qc_allocated);
4501 void __ata_qc_complete(struct ata_queued_cmd *qc)
4503 struct ata_port *ap = qc->ap;
4504 struct ata_link *link = qc->dev->link;
4506 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4507 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4509 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4512 /* command should be marked inactive atomically with qc completion */
4513 if (qc->tf.protocol == ATA_PROT_NCQ) {
4514 link->sactive &= ~(1 << qc->tag);
4516 ap->nr_active_links--;
4518 link->active_tag = ATA_TAG_POISON;
4519 ap->nr_active_links--;
4522 /* clear exclusive status */
4523 if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
4524 ap->excl_link == link))
4525 ap->excl_link = NULL;
4527 /* atapi: mark qc as inactive to prevent the interrupt handler
4528 * from completing the command twice later, before the error handler
4529 * is called. (when rc != 0 and atapi request sense is needed)
4531 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4532 ap->qc_active &= ~(1 << qc->tag);
4534 /* call completion callback */
4535 qc->complete_fn(qc);
4538 static void fill_result_tf(struct ata_queued_cmd *qc)
4540 struct ata_port *ap = qc->ap;
4542 qc->result_tf.flags = qc->tf.flags;
4543 ap->ops->qc_fill_rtf(qc);
4546 static void ata_verify_xfer(struct ata_queued_cmd *qc)
4548 struct ata_device *dev = qc->dev;
4550 if (ata_tag_internal(qc->tag))
4553 if (ata_is_nodata(qc->tf.protocol))
4556 if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
4559 dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
4563 * ata_qc_complete - Complete an active ATA command
4564 * @qc: Command to complete
4565 * @err_mask: ATA Status register contents
4567 * Indicate to the mid and upper layers that an ATA
4568 * command has completed, with either an ok or not-ok status.
4571 * spin_lock_irqsave(host lock)
4573 void ata_qc_complete(struct ata_queued_cmd *qc)
4575 struct ata_port *ap = qc->ap;
4577 /* XXX: New EH and old EH use different mechanisms to
4578 * synchronize EH with regular execution path.
4580 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4581 * Normal execution path is responsible for not accessing a
4582 * failed qc. libata core enforces the rule by returning NULL
4583 * from ata_qc_from_tag() for failed qcs.
4585 * Old EH depends on ata_qc_complete() nullifying completion
4586 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4587 * not synchronize with interrupt handler. Only PIO task is
4590 if (ap->ops->error_handler) {
4591 struct ata_device *dev = qc->dev;
4592 struct ata_eh_info *ehi = &dev->link->eh_info;
4594 WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4596 if (unlikely(qc->err_mask))
4597 qc->flags |= ATA_QCFLAG_FAILED;
4599 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
4600 if (!ata_tag_internal(qc->tag)) {
4601 /* always fill result TF for failed qc */
4603 ata_qc_schedule_eh(qc);
4608 /* read result TF if requested */
4609 if (qc->flags & ATA_QCFLAG_RESULT_TF)
4612 /* Some commands need post-processing after successful
4615 switch (qc->tf.command) {
4616 case ATA_CMD_SET_FEATURES:
4617 if (qc->tf.feature != SETFEATURES_WC_ON &&
4618 qc->tf.feature != SETFEATURES_WC_OFF)
4621 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
4622 case ATA_CMD_SET_MULTI: /* multi_count changed */
4623 /* revalidate device */
4624 ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
4625 ata_port_schedule_eh(ap);
4629 dev->flags |= ATA_DFLAG_SLEEPING;
4633 if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
4634 ata_verify_xfer(qc);
4636 __ata_qc_complete(qc);
4638 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
4641 /* read result TF if failed or requested */
4642 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
4645 __ata_qc_complete(qc);
4650 * ata_qc_complete_multiple - Complete multiple qcs successfully
4651 * @ap: port in question
4652 * @qc_active: new qc_active mask
4654 * Complete in-flight commands. This functions is meant to be
4655 * called from low-level driver's interrupt routine to complete
4656 * requests normally. ap->qc_active and @qc_active is compared
4657 * and commands are completed accordingly.
4660 * spin_lock_irqsave(host lock)
4663 * Number of completed commands on success, -errno otherwise.
4665 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
4671 done_mask = ap->qc_active ^ qc_active;
4673 if (unlikely(done_mask & qc_active)) {
4674 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
4675 "(%08x->%08x)\n", ap->qc_active, qc_active);
4679 for (i = 0; i < ATA_MAX_QUEUE; i++) {
4680 struct ata_queued_cmd *qc;
4682 if (!(done_mask & (1 << i)))
4685 if ((qc = ata_qc_from_tag(ap, i))) {
4686 ata_qc_complete(qc);
4695 * ata_qc_issue - issue taskfile to device
4696 * @qc: command to issue to device
4698 * Prepare an ATA command to submission to device.
4699 * This includes mapping the data into a DMA-able
4700 * area, filling in the S/G table, and finally
4701 * writing the taskfile to hardware, starting the command.
4704 * spin_lock_irqsave(host lock)
4706 void ata_qc_issue(struct ata_queued_cmd *qc)
4708 struct ata_port *ap = qc->ap;
4709 struct ata_link *link = qc->dev->link;
4710 u8 prot = qc->tf.protocol;
4712 /* Make sure only one non-NCQ command is outstanding. The
4713 * check is skipped for old EH because it reuses active qc to
4714 * request ATAPI sense.
4716 WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
4718 if (ata_is_ncq(prot)) {
4719 WARN_ON(link->sactive & (1 << qc->tag));
4722 ap->nr_active_links++;
4723 link->sactive |= 1 << qc->tag;
4725 WARN_ON(link->sactive);
4727 ap->nr_active_links++;
4728 link->active_tag = qc->tag;
4731 qc->flags |= ATA_QCFLAG_ACTIVE;
4732 ap->qc_active |= 1 << qc->tag;
4734 /* We guarantee to LLDs that they will have at least one
4735 * non-zero sg if the command is a data command.
4737 BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
4739 if (ata_is_dma(prot) || (ata_is_pio(prot) &&
4740 (ap->flags & ATA_FLAG_PIO_DMA)))
4741 if (ata_sg_setup(qc))
4744 /* if device is sleeping, schedule reset and abort the link */
4745 if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
4746 link->eh_info.action |= ATA_EH_RESET;
4747 ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
4748 ata_link_abort(link);
4752 ap->ops->qc_prep(qc);
4754 qc->err_mask |= ap->ops->qc_issue(qc);
4755 if (unlikely(qc->err_mask))
4760 qc->err_mask |= AC_ERR_SYSTEM;
4762 ata_qc_complete(qc);
4766 * sata_scr_valid - test whether SCRs are accessible
4767 * @link: ATA link to test SCR accessibility for
4769 * Test whether SCRs are accessible for @link.
4775 * 1 if SCRs are accessible, 0 otherwise.
4777 int sata_scr_valid(struct ata_link *link)
4779 struct ata_port *ap = link->ap;
4781 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
4785 * sata_scr_read - read SCR register of the specified port
4786 * @link: ATA link to read SCR for
4788 * @val: Place to store read value
4790 * Read SCR register @reg of @link into *@val. This function is
4791 * guaranteed to succeed if @link is ap->link, the cable type of
4792 * the port is SATA and the port implements ->scr_read.
4795 * None if @link is ap->link. Kernel thread context otherwise.
4798 * 0 on success, negative errno on failure.
4800 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
4802 if (ata_is_host_link(link)) {
4803 struct ata_port *ap = link->ap;
4805 if (sata_scr_valid(link))
4806 return ap->ops->scr_read(ap, reg, val);
4810 return sata_pmp_scr_read(link, reg, val);
4814 * sata_scr_write - write SCR register of the specified port
4815 * @link: ATA link to write SCR for
4816 * @reg: SCR to write
4817 * @val: value to write
4819 * Write @val to SCR register @reg of @link. This function is
4820 * guaranteed to succeed if @link is ap->link, the cable type of
4821 * the port is SATA and the port implements ->scr_read.
4824 * None if @link is ap->link. Kernel thread context otherwise.
4827 * 0 on success, negative errno on failure.
4829 int sata_scr_write(struct ata_link *link, int reg, u32 val)
4831 if (ata_is_host_link(link)) {
4832 struct ata_port *ap = link->ap;
4834 if (sata_scr_valid(link))
4835 return ap->ops->scr_write(ap, reg, val);
4839 return sata_pmp_scr_write(link, reg, val);
4843 * sata_scr_write_flush - write SCR register of the specified port and flush
4844 * @link: ATA link to write SCR for
4845 * @reg: SCR to write
4846 * @val: value to write
4848 * This function is identical to sata_scr_write() except that this
4849 * function performs flush after writing to the register.
4852 * None if @link is ap->link. Kernel thread context otherwise.
4855 * 0 on success, negative errno on failure.
4857 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
4859 if (ata_is_host_link(link)) {
4860 struct ata_port *ap = link->ap;
4863 if (sata_scr_valid(link)) {
4864 rc = ap->ops->scr_write(ap, reg, val);
4866 rc = ap->ops->scr_read(ap, reg, &val);
4872 return sata_pmp_scr_write(link, reg, val);
4876 * ata_link_online - test whether the given link is online
4877 * @link: ATA link to test
4879 * Test whether @link is online. Note that this function returns
4880 * 0 if online status of @link cannot be obtained, so
4881 * ata_link_online(link) != !ata_link_offline(link).
4887 * 1 if the port online status is available and online.
4889 int ata_link_online(struct ata_link *link)
4893 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
4894 (sstatus & 0xf) == 0x3)
4900 * ata_link_offline - test whether the given link is offline
4901 * @link: ATA link to test
4903 * Test whether @link is offline. Note that this function
4904 * returns 0 if offline status of @link cannot be obtained, so
4905 * ata_link_online(link) != !ata_link_offline(link).
4911 * 1 if the port offline status is available and offline.
4913 int ata_link_offline(struct ata_link *link)
4917 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
4918 (sstatus & 0xf) != 0x3)
4924 static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
4925 unsigned int action, unsigned int ehi_flags,
4928 unsigned long flags;
4931 for (i = 0; i < host->n_ports; i++) {
4932 struct ata_port *ap = host->ports[i];
4933 struct ata_link *link;
4935 /* Previous resume operation might still be in
4936 * progress. Wait for PM_PENDING to clear.
4938 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
4939 ata_port_wait_eh(ap);
4940 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
4943 /* request PM ops to EH */
4944 spin_lock_irqsave(ap->lock, flags);
4949 ap->pm_result = &rc;
4952 ap->pflags |= ATA_PFLAG_PM_PENDING;
4953 __ata_port_for_each_link(link, ap) {
4954 link->eh_info.action |= action;
4955 link->eh_info.flags |= ehi_flags;
4958 ata_port_schedule_eh(ap);
4960 spin_unlock_irqrestore(ap->lock, flags);
4962 /* wait and check result */
4964 ata_port_wait_eh(ap);
4965 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
4975 * ata_host_suspend - suspend host
4976 * @host: host to suspend
4979 * Suspend @host. Actual operation is performed by EH. This
4980 * function requests EH to perform PM operations and waits for EH
4984 * Kernel thread context (may sleep).
4987 * 0 on success, -errno on failure.
4989 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
4994 * disable link pm on all ports before requesting
4997 ata_lpm_enable(host);
4999 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5001 host->dev->power.power_state = mesg;
5006 * ata_host_resume - resume host
5007 * @host: host to resume
5009 * Resume @host. Actual operation is performed by EH. This
5010 * function requests EH to perform PM operations and returns.
5011 * Note that all resume operations are performed parallely.
5014 * Kernel thread context (may sleep).
5016 void ata_host_resume(struct ata_host *host)
5018 ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
5019 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5020 host->dev->power.power_state = PMSG_ON;
5022 /* reenable link pm */
5023 ata_lpm_disable(host);
5028 * ata_port_start - Set port up for dma.
5029 * @ap: Port to initialize
5031 * Called just after data structures for each port are
5032 * initialized. Allocates space for PRD table.
5034 * May be used as the port_start() entry in ata_port_operations.
5037 * Inherited from caller.
5039 int ata_port_start(struct ata_port *ap)
5041 struct device *dev = ap->dev;
5043 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
5052 * ata_dev_init - Initialize an ata_device structure
5053 * @dev: Device structure to initialize
5055 * Initialize @dev in preparation for probing.
5058 * Inherited from caller.
5060 void ata_dev_init(struct ata_device *dev)
5062 struct ata_link *link = dev->link;
5063 struct ata_port *ap = link->ap;
5064 unsigned long flags;
5066 /* SATA spd limit is bound to the first device */
5067 link->sata_spd_limit = link->hw_sata_spd_limit;
5070 /* High bits of dev->flags are used to record warm plug
5071 * requests which occur asynchronously. Synchronize using
5074 spin_lock_irqsave(ap->lock, flags);
5075 dev->flags &= ~ATA_DFLAG_INIT_MASK;
5077 spin_unlock_irqrestore(ap->lock, flags);
5079 memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
5080 sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5081 dev->pio_mask = UINT_MAX;
5082 dev->mwdma_mask = UINT_MAX;
5083 dev->udma_mask = UINT_MAX;
5087 * ata_link_init - Initialize an ata_link structure
5088 * @ap: ATA port link is attached to
5089 * @link: Link structure to initialize
5090 * @pmp: Port multiplier port number
5095 * Kernel thread context (may sleep)
5097 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5101 /* clear everything except for devices */
5102 memset(link, 0, offsetof(struct ata_link, device[0]));
5106 link->active_tag = ATA_TAG_POISON;
5107 link->hw_sata_spd_limit = UINT_MAX;
5109 /* can't use iterator, ap isn't initialized yet */
5110 for (i = 0; i < ATA_MAX_DEVICES; i++) {
5111 struct ata_device *dev = &link->device[i];
5114 dev->devno = dev - link->device;
5120 * sata_link_init_spd - Initialize link->sata_spd_limit
5121 * @link: Link to configure sata_spd_limit for
5123 * Initialize @link->[hw_]sata_spd_limit to the currently
5127 * Kernel thread context (may sleep).
5130 * 0 on success, -errno on failure.
5132 int sata_link_init_spd(struct ata_link *link)
5138 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
5142 spd = (scontrol >> 4) & 0xf;
5144 link->hw_sata_spd_limit &= (1 << spd) - 1;
5146 ata_force_spd_limit(link);
5148 link->sata_spd_limit = link->hw_sata_spd_limit;
5154 * ata_port_alloc - allocate and initialize basic ATA port resources
5155 * @host: ATA host this allocated port belongs to
5157 * Allocate and initialize basic ATA port resources.
5160 * Allocate ATA port on success, NULL on failure.
5163 * Inherited from calling layer (may sleep).
5165 struct ata_port *ata_port_alloc(struct ata_host *host)
5167 struct ata_port *ap;
5171 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
5175 ap->pflags |= ATA_PFLAG_INITIALIZING;
5176 ap->lock = &host->lock;
5177 ap->flags = ATA_FLAG_DISABLED;
5179 ap->ctl = ATA_DEVCTL_OBS;
5181 ap->dev = host->dev;
5182 ap->last_ctl = 0xFF;
5184 #if defined(ATA_VERBOSE_DEBUG)
5185 /* turn on all debugging levels */
5186 ap->msg_enable = 0x00FF;
5187 #elif defined(ATA_DEBUG)
5188 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
5190 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5193 #ifdef CONFIG_ATA_SFF
5194 INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
5196 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
5197 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5198 INIT_LIST_HEAD(&ap->eh_done_q);
5199 init_waitqueue_head(&ap->eh_wait_q);
5200 init_timer_deferrable(&ap->fastdrain_timer);
5201 ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
5202 ap->fastdrain_timer.data = (unsigned long)ap;
5204 ap->cbl = ATA_CBL_NONE;
5206 ata_link_init(ap, &ap->link, 0);
5209 ap->stats.unhandled_irq = 1;
5210 ap->stats.idle_irq = 1;
5215 static void ata_host_release(struct device *gendev, void *res)
5217 struct ata_host *host = dev_get_drvdata(gendev);
5220 for (i = 0; i < host->n_ports; i++) {
5221 struct ata_port *ap = host->ports[i];
5227 scsi_host_put(ap->scsi_host);
5229 kfree(ap->pmp_link);
5231 host->ports[i] = NULL;
5234 dev_set_drvdata(gendev, NULL);
5238 * ata_host_alloc - allocate and init basic ATA host resources
5239 * @dev: generic device this host is associated with
5240 * @max_ports: maximum number of ATA ports associated with this host
5242 * Allocate and initialize basic ATA host resources. LLD calls
5243 * this function to allocate a host, initializes it fully and
5244 * attaches it using ata_host_register().
5246 * @max_ports ports are allocated and host->n_ports is
5247 * initialized to @max_ports. The caller is allowed to decrease
5248 * host->n_ports before calling ata_host_register(). The unused
5249 * ports will be automatically freed on registration.
5252 * Allocate ATA host on success, NULL on failure.
5255 * Inherited from calling layer (may sleep).
5257 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
5259 struct ata_host *host;
5265 if (!devres_open_group(dev, NULL, GFP_KERNEL))
5268 /* alloc a container for our list of ATA ports (buses) */
5269 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
5270 /* alloc a container for our list of ATA ports (buses) */
5271 host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
5275 devres_add(dev, host);
5276 dev_set_drvdata(dev, host);
5278 spin_lock_init(&host->lock);
5280 host->n_ports = max_ports;
5282 /* allocate ports bound to this host */
5283 for (i = 0; i < max_ports; i++) {
5284 struct ata_port *ap;
5286 ap = ata_port_alloc(host);
5291 host->ports[i] = ap;
5294 devres_remove_group(dev, NULL);
5298 devres_release_group(dev, NULL);
5303 * ata_host_alloc_pinfo - alloc host and init with port_info array
5304 * @dev: generic device this host is associated with
5305 * @ppi: array of ATA port_info to initialize host with
5306 * @n_ports: number of ATA ports attached to this host
5308 * Allocate ATA host and initialize with info from @ppi. If NULL
5309 * terminated, @ppi may contain fewer entries than @n_ports. The
5310 * last entry will be used for the remaining ports.
5313 * Allocate ATA host on success, NULL on failure.
5316 * Inherited from calling layer (may sleep).
5318 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
5319 const struct ata_port_info * const * ppi,
5322 const struct ata_port_info *pi;
5323 struct ata_host *host;
5326 host = ata_host_alloc(dev, n_ports);
5330 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
5331 struct ata_port *ap = host->ports[i];
5336 ap->pio_mask = pi->pio_mask;
5337 ap->mwdma_mask = pi->mwdma_mask;
5338 ap->udma_mask = pi->udma_mask;
5339 ap->flags |= pi->flags;
5340 ap->link.flags |= pi->link_flags;
5341 ap->ops = pi->port_ops;
5343 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
5344 host->ops = pi->port_ops;
5350 static void ata_host_stop(struct device *gendev, void *res)
5352 struct ata_host *host = dev_get_drvdata(gendev);
5355 WARN_ON(!(host->flags & ATA_HOST_STARTED));
5357 for (i = 0; i < host->n_ports; i++) {
5358 struct ata_port *ap = host->ports[i];
5360 if (ap->ops->port_stop)
5361 ap->ops->port_stop(ap);
5364 if (host->ops->host_stop)
5365 host->ops->host_stop(host);
5369 * ata_finalize_port_ops - finalize ata_port_operations
5370 * @ops: ata_port_operations to finalize
5372 * An ata_port_operations can inherit from another ops and that
5373 * ops can again inherit from another. This can go on as many
5374 * times as necessary as long as there is no loop in the
5375 * inheritance chain.
5377 * Ops tables are finalized when the host is started. NULL or
5378 * unspecified entries are inherited from the closet ancestor
5379 * which has the method and the entry is populated with it.
5380 * After finalization, the ops table directly points to all the
5381 * methods and ->inherits is no longer necessary and cleared.
5383 * Using ATA_OP_NULL, inheriting ops can force a method to NULL.
5388 static void ata_finalize_port_ops(struct ata_port_operations *ops)
5390 static spinlock_t lock = SPIN_LOCK_UNLOCKED;
5391 const struct ata_port_operations *cur;
5392 void **begin = (void **)ops;
5393 void **end = (void **)&ops->inherits;
5396 if (!ops || !ops->inherits)
5401 for (cur = ops->inherits; cur; cur = cur->inherits) {
5402 void **inherit = (void **)cur;
5404 for (pp = begin; pp < end; pp++, inherit++)
5409 for (pp = begin; pp < end; pp++)
5413 ops->inherits = NULL;
5419 * ata_host_start - start and freeze ports of an ATA host
5420 * @host: ATA host to start ports for
5422 * Start and then freeze ports of @host. Started status is
5423 * recorded in host->flags, so this function can be called
5424 * multiple times. Ports are guaranteed to get started only
5425 * once. If host->ops isn't initialized yet, its set to the
5426 * first non-dummy port ops.
5429 * Inherited from calling layer (may sleep).
5432 * 0 if all ports are started successfully, -errno otherwise.
5434 int ata_host_start(struct ata_host *host)
5437 void *start_dr = NULL;
5440 if (host->flags & ATA_HOST_STARTED)
5443 ata_finalize_port_ops(host->ops);
5445 for (i = 0; i < host->n_ports; i++) {
5446 struct ata_port *ap = host->ports[i];
5448 ata_finalize_port_ops(ap->ops);
5450 if (!host->ops && !ata_port_is_dummy(ap))
5451 host->ops = ap->ops;
5453 if (ap->ops->port_stop)
5457 if (host->ops->host_stop)
5461 start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
5466 for (i = 0; i < host->n_ports; i++) {
5467 struct ata_port *ap = host->ports[i];
5469 if (ap->ops->port_start) {
5470 rc = ap->ops->port_start(ap);
5473 dev_printk(KERN_ERR, host->dev,
5474 "failed to start port %d "
5475 "(errno=%d)\n", i, rc);
5479 ata_eh_freeze_port(ap);
5483 devres_add(host->dev, start_dr);
5484 host->flags |= ATA_HOST_STARTED;
5489 struct ata_port *ap = host->ports[i];
5491 if (ap->ops->port_stop)
5492 ap->ops->port_stop(ap);
5494 devres_free(start_dr);
5499 * ata_sas_host_init - Initialize a host struct
5500 * @host: host to initialize
5501 * @dev: device host is attached to
5502 * @flags: host flags
5506 * PCI/etc. bus probe sem.
5509 /* KILLME - the only user left is ipr */
5510 void ata_host_init(struct ata_host *host, struct device *dev,
5511 unsigned long flags, struct ata_port_operations *ops)
5513 spin_lock_init(&host->lock);
5515 host->flags = flags;
5520 * ata_host_register - register initialized ATA host
5521 * @host: ATA host to register
5522 * @sht: template for SCSI host
5524 * Register initialized ATA host. @host is allocated using
5525 * ata_host_alloc() and fully initialized by LLD. This function
5526 * starts ports, registers @host with ATA and SCSI layers and
5527 * probe registered devices.
5530 * Inherited from calling layer (may sleep).
5533 * 0 on success, -errno otherwise.
5535 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
5539 /* host must have been started */
5540 if (!(host->flags & ATA_HOST_STARTED)) {
5541 dev_printk(KERN_ERR, host->dev,
5542 "BUG: trying to register unstarted host\n");
5547 /* Blow away unused ports. This happens when LLD can't
5548 * determine the exact number of ports to allocate at
5551 for (i = host->n_ports; host->ports[i]; i++)
5552 kfree(host->ports[i]);
5554 /* give ports names and add SCSI hosts */
5555 for (i = 0; i < host->n_ports; i++)
5556 host->ports[i]->print_id = ata_print_id++;
5558 rc = ata_scsi_add_hosts(host, sht);
5562 /* associate with ACPI nodes */
5563 ata_acpi_associate(host);
5565 /* set cable, sata_spd_limit and report */
5566 for (i = 0; i < host->n_ports; i++) {
5567 struct ata_port *ap = host->ports[i];
5568 unsigned long xfer_mask;
5570 /* set SATA cable type if still unset */
5571 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
5572 ap->cbl = ATA_CBL_SATA;
5574 /* init sata_spd_limit to the current value */
5575 sata_link_init_spd(&ap->link);
5577 /* print per-port info to dmesg */
5578 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
5581 if (!ata_port_is_dummy(ap)) {
5582 ata_port_printk(ap, KERN_INFO,
5583 "%cATA max %s %s\n",
5584 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
5585 ata_mode_string(xfer_mask),
5586 ap->link.eh_info.desc);
5587 ata_ehi_clear_desc(&ap->link.eh_info);
5589 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
5592 /* perform each probe synchronously */
5593 DPRINTK("probe begin\n");
5594 for (i = 0; i < host->n_ports; i++) {
5595 struct ata_port *ap = host->ports[i];
5598 if (ap->ops->error_handler) {
5599 struct ata_eh_info *ehi = &ap->link.eh_info;
5600 unsigned long flags;
5604 /* kick EH for boot probing */
5605 spin_lock_irqsave(ap->lock, flags);
5607 ehi->probe_mask |= ATA_ALL_DEVICES;
5608 ehi->action |= ATA_EH_RESET;
5609 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5611 ap->pflags &= ~ATA_PFLAG_INITIALIZING;
5612 ap->pflags |= ATA_PFLAG_LOADING;
5613 ata_port_schedule_eh(ap);
5615 spin_unlock_irqrestore(ap->lock, flags);
5617 /* wait for EH to finish */
5618 ata_port_wait_eh(ap);
5620 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
5621 rc = ata_bus_probe(ap);
5622 DPRINTK("ata%u: bus probe end\n", ap->print_id);
5625 /* FIXME: do something useful here?
5626 * Current libata behavior will
5627 * tear down everything when
5628 * the module is removed
5629 * or the h/w is unplugged.
5635 /* probes are done, now scan each port's disk(s) */
5636 DPRINTK("host probe begin\n");
5637 for (i = 0; i < host->n_ports; i++) {
5638 struct ata_port *ap = host->ports[i];
5640 ata_scsi_scan_host(ap, 1);
5641 ata_lpm_schedule(ap, ap->pm_policy);
5648 * ata_host_activate - start host, request IRQ and register it
5649 * @host: target ATA host
5650 * @irq: IRQ to request
5651 * @irq_handler: irq_handler used when requesting IRQ
5652 * @irq_flags: irq_flags used when requesting IRQ
5653 * @sht: scsi_host_template to use when registering the host
5655 * After allocating an ATA host and initializing it, most libata
5656 * LLDs perform three steps to activate the host - start host,
5657 * request IRQ and register it. This helper takes necessasry
5658 * arguments and performs the three steps in one go.
5660 * An invalid IRQ skips the IRQ registration and expects the host to
5661 * have set polling mode on the port. In this case, @irq_handler
5665 * Inherited from calling layer (may sleep).
5668 * 0 on success, -errno otherwise.
5670 int ata_host_activate(struct ata_host *host, int irq,
5671 irq_handler_t irq_handler, unsigned long irq_flags,
5672 struct scsi_host_template *sht)
5676 rc = ata_host_start(host);
5680 /* Special case for polling mode */
5682 WARN_ON(irq_handler);
5683 return ata_host_register(host, sht);
5686 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
5687 dev_driver_string(host->dev), host);
5691 for (i = 0; i < host->n_ports; i++)
5692 ata_port_desc(host->ports[i], "irq %d", irq);
5694 rc = ata_host_register(host, sht);
5695 /* if failed, just free the IRQ and leave ports alone */
5697 devm_free_irq(host->dev, irq, host);
5703 * ata_port_detach - Detach ATA port in prepration of device removal
5704 * @ap: ATA port to be detached
5706 * Detach all ATA devices and the associated SCSI devices of @ap;
5707 * then, remove the associated SCSI host. @ap is guaranteed to
5708 * be quiescent on return from this function.
5711 * Kernel thread context (may sleep).
5713 static void ata_port_detach(struct ata_port *ap)
5715 unsigned long flags;
5716 struct ata_link *link;
5717 struct ata_device *dev;
5719 if (!ap->ops->error_handler)
5722 /* tell EH we're leaving & flush EH */
5723 spin_lock_irqsave(ap->lock, flags);
5724 ap->pflags |= ATA_PFLAG_UNLOADING;
5725 spin_unlock_irqrestore(ap->lock, flags);
5727 ata_port_wait_eh(ap);
5729 /* EH is now guaranteed to see UNLOADING - EH context belongs
5730 * to us. Disable all existing devices.
5732 ata_port_for_each_link(link, ap) {
5733 ata_link_for_each_dev(dev, link)
5734 ata_dev_disable(dev);
5737 /* Final freeze & EH. All in-flight commands are aborted. EH
5738 * will be skipped and retrials will be terminated with bad
5741 spin_lock_irqsave(ap->lock, flags);
5742 ata_port_freeze(ap); /* won't be thawed */
5743 spin_unlock_irqrestore(ap->lock, flags);
5745 ata_port_wait_eh(ap);
5746 cancel_rearming_delayed_work(&ap->hotplug_task);
5749 /* remove the associated SCSI host */
5750 scsi_remove_host(ap->scsi_host);
5754 * ata_host_detach - Detach all ports of an ATA host
5755 * @host: Host to detach
5757 * Detach all ports of @host.
5760 * Kernel thread context (may sleep).
5762 void ata_host_detach(struct ata_host *host)
5766 for (i = 0; i < host->n_ports; i++)
5767 ata_port_detach(host->ports[i]);
5769 /* the host is dead now, dissociate ACPI */
5770 ata_acpi_dissociate(host);
5776 * ata_pci_remove_one - PCI layer callback for device removal
5777 * @pdev: PCI device that was removed
5779 * PCI layer indicates to libata via this hook that hot-unplug or
5780 * module unload event has occurred. Detach all ports. Resource
5781 * release is handled via devres.
5784 * Inherited from PCI layer (may sleep).
5786 void ata_pci_remove_one(struct pci_dev *pdev)
5788 struct device *dev = &pdev->dev;
5789 struct ata_host *host = dev_get_drvdata(dev);
5791 ata_host_detach(host);
5794 /* move to PCI subsystem */
5795 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
5797 unsigned long tmp = 0;
5799 switch (bits->width) {
5802 pci_read_config_byte(pdev, bits->reg, &tmp8);
5808 pci_read_config_word(pdev, bits->reg, &tmp16);
5814 pci_read_config_dword(pdev, bits->reg, &tmp32);
5825 return (tmp == bits->val) ? 1 : 0;
5829 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
5831 pci_save_state(pdev);
5832 pci_disable_device(pdev);
5834 if (mesg.event & PM_EVENT_SLEEP)
5835 pci_set_power_state(pdev, PCI_D3hot);
5838 int ata_pci_device_do_resume(struct pci_dev *pdev)
5842 pci_set_power_state(pdev, PCI_D0);
5843 pci_restore_state(pdev);
5845 rc = pcim_enable_device(pdev);
5847 dev_printk(KERN_ERR, &pdev->dev,
5848 "failed to enable device after resume (%d)\n", rc);
5852 pci_set_master(pdev);
5856 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
5858 struct ata_host *host = dev_get_drvdata(&pdev->dev);
5861 rc = ata_host_suspend(host, mesg);
5865 ata_pci_device_do_suspend(pdev, mesg);
5870 int ata_pci_device_resume(struct pci_dev *pdev)
5872 struct ata_host *host = dev_get_drvdata(&pdev->dev);
5875 rc = ata_pci_device_do_resume(pdev);
5877 ata_host_resume(host);
5880 #endif /* CONFIG_PM */
5882 #endif /* CONFIG_PCI */
5884 static int __init ata_parse_force_one(char **cur,
5885 struct ata_force_ent *force_ent,
5886 const char **reason)
5888 /* FIXME: Currently, there's no way to tag init const data and
5889 * using __initdata causes build failure on some versions of
5890 * gcc. Once __initdataconst is implemented, add const to the
5891 * following structure.
5893 static struct ata_force_param force_tbl[] __initdata = {
5894 { "40c", .cbl = ATA_CBL_PATA40 },
5895 { "80c", .cbl = ATA_CBL_PATA80 },
5896 { "short40c", .cbl = ATA_CBL_PATA40_SHORT },
5897 { "unk", .cbl = ATA_CBL_PATA_UNK },
5898 { "ign", .cbl = ATA_CBL_PATA_IGN },
5899 { "sata", .cbl = ATA_CBL_SATA },
5900 { "1.5Gbps", .spd_limit = 1 },
5901 { "3.0Gbps", .spd_limit = 2 },
5902 { "noncq", .horkage_on = ATA_HORKAGE_NONCQ },
5903 { "ncq", .horkage_off = ATA_HORKAGE_NONCQ },
5904 { "pio0", .xfer_mask = 1 << (ATA_SHIFT_PIO + 0) },
5905 { "pio1", .xfer_mask = 1 << (ATA_SHIFT_PIO + 1) },
5906 { "pio2", .xfer_mask = 1 << (ATA_SHIFT_PIO + 2) },
5907 { "pio3", .xfer_mask = 1 << (ATA_SHIFT_PIO + 3) },
5908 { "pio4", .xfer_mask = 1 << (ATA_SHIFT_PIO + 4) },
5909 { "pio5", .xfer_mask = 1 << (ATA_SHIFT_PIO + 5) },
5910 { "pio6", .xfer_mask = 1 << (ATA_SHIFT_PIO + 6) },
5911 { "mwdma0", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 0) },
5912 { "mwdma1", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 1) },
5913 { "mwdma2", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 2) },
5914 { "mwdma3", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 3) },
5915 { "mwdma4", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 4) },
5916 { "udma0", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
5917 { "udma16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
5918 { "udma/16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
5919 { "udma1", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
5920 { "udma25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
5921 { "udma/25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
5922 { "udma2", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
5923 { "udma33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
5924 { "udma/33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
5925 { "udma3", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
5926 { "udma44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
5927 { "udma/44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
5928 { "udma4", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
5929 { "udma66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
5930 { "udma/66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
5931 { "udma5", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
5932 { "udma100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
5933 { "udma/100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
5934 { "udma6", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
5935 { "udma133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
5936 { "udma/133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
5937 { "udma7", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 7) },
5939 char *start = *cur, *p = *cur;
5940 char *id, *val, *endp;
5941 const struct ata_force_param *match_fp = NULL;
5942 int nr_matches = 0, i;
5944 /* find where this param ends and update *cur */
5945 while (*p != '\0' && *p != ',')
5956 p = strchr(start, ':');
5958 val = strstrip(start);
5963 id = strstrip(start);
5964 val = strstrip(p + 1);
5967 p = strchr(id, '.');
5970 force_ent->device = simple_strtoul(p, &endp, 10);
5971 if (p == endp || *endp != '\0') {
5972 *reason = "invalid device";
5977 force_ent->port = simple_strtoul(id, &endp, 10);
5978 if (p == endp || *endp != '\0') {
5979 *reason = "invalid port/link";
5984 /* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */
5985 for (i = 0; i < ARRAY_SIZE(force_tbl); i++) {
5986 const struct ata_force_param *fp = &force_tbl[i];
5988 if (strncasecmp(val, fp->name, strlen(val)))
5994 if (strcasecmp(val, fp->name) == 0) {
6001 *reason = "unknown value";
6004 if (nr_matches > 1) {
6005 *reason = "ambigious value";
6009 force_ent->param = *match_fp;
6014 static void __init ata_parse_force_param(void)
6016 int idx = 0, size = 1;
6017 int last_port = -1, last_device = -1;
6018 char *p, *cur, *next;
6020 /* calculate maximum number of params and allocate force_tbl */
6021 for (p = ata_force_param_buf; *p; p++)
6025 ata_force_tbl = kzalloc(sizeof(ata_force_tbl[0]) * size, GFP_KERNEL);
6026 if (!ata_force_tbl) {
6027 printk(KERN_WARNING "ata: failed to extend force table, "
6028 "libata.force ignored\n");
6032 /* parse and populate the table */
6033 for (cur = ata_force_param_buf; *cur != '\0'; cur = next) {
6034 const char *reason = "";
6035 struct ata_force_ent te = { .port = -1, .device = -1 };
6038 if (ata_parse_force_one(&next, &te, &reason)) {
6039 printk(KERN_WARNING "ata: failed to parse force "
6040 "parameter \"%s\" (%s)\n",
6045 if (te.port == -1) {
6046 te.port = last_port;
6047 te.device = last_device;
6050 ata_force_tbl[idx++] = te;
6052 last_port = te.port;
6053 last_device = te.device;
6056 ata_force_tbl_size = idx;
6059 static int __init ata_init(void)
6061 ata_probe_timeout *= HZ;
6063 ata_parse_force_param();
6065 ata_wq = create_workqueue("ata");
6069 ata_aux_wq = create_singlethread_workqueue("ata_aux");
6071 destroy_workqueue(ata_wq);
6075 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
6079 static void __exit ata_exit(void)
6081 kfree(ata_force_tbl);
6082 destroy_workqueue(ata_wq);
6083 destroy_workqueue(ata_aux_wq);
6086 subsys_initcall(ata_init);
6087 module_exit(ata_exit);
6089 static unsigned long ratelimit_time;
6090 static DEFINE_SPINLOCK(ata_ratelimit_lock);
6092 int ata_ratelimit(void)
6095 unsigned long flags;
6097 spin_lock_irqsave(&ata_ratelimit_lock, flags);
6099 if (time_after(jiffies, ratelimit_time)) {
6101 ratelimit_time = jiffies + (HZ/5);
6105 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
6111 * ata_wait_register - wait until register value changes
6112 * @reg: IO-mapped register
6113 * @mask: Mask to apply to read register value
6114 * @val: Wait condition
6115 * @interval_msec: polling interval in milliseconds
6116 * @timeout_msec: timeout in milliseconds
6118 * Waiting for some bits of register to change is a common
6119 * operation for ATA controllers. This function reads 32bit LE
6120 * IO-mapped register @reg and tests for the following condition.
6122 * (*@reg & mask) != val
6124 * If the condition is met, it returns; otherwise, the process is
6125 * repeated after @interval_msec until timeout.
6128 * Kernel thread context (may sleep)
6131 * The final register value.
6133 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
6134 unsigned long interval_msec,
6135 unsigned long timeout_msec)
6137 unsigned long timeout;
6140 tmp = ioread32(reg);
6142 /* Calculate timeout _after_ the first read to make sure
6143 * preceding writes reach the controller before starting to
6144 * eat away the timeout.
6146 timeout = jiffies + (timeout_msec * HZ) / 1000;
6148 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
6149 msleep(interval_msec);
6150 tmp = ioread32(reg);
6159 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
6161 return AC_ERR_SYSTEM;
6164 static void ata_dummy_error_handler(struct ata_port *ap)
6169 struct ata_port_operations ata_dummy_port_ops = {
6170 .qc_prep = ata_noop_qc_prep,
6171 .qc_issue = ata_dummy_qc_issue,
6172 .error_handler = ata_dummy_error_handler,
6175 const struct ata_port_info ata_dummy_port_info = {
6176 .port_ops = &ata_dummy_port_ops,
6180 * libata is essentially a library of internal helper functions for
6181 * low-level ATA host controller drivers. As such, the API/ABI is
6182 * likely to change as new drivers are added and updated.
6183 * Do not depend on ABI/API stability.
6185 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
6186 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
6187 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6188 EXPORT_SYMBOL_GPL(ata_base_port_ops);
6189 EXPORT_SYMBOL_GPL(sata_port_ops);
6190 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6191 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
6192 EXPORT_SYMBOL_GPL(ata_std_bios_param);
6193 EXPORT_SYMBOL_GPL(ata_host_init);
6194 EXPORT_SYMBOL_GPL(ata_host_alloc);
6195 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6196 EXPORT_SYMBOL_GPL(ata_host_start);
6197 EXPORT_SYMBOL_GPL(ata_host_register);
6198 EXPORT_SYMBOL_GPL(ata_host_activate);
6199 EXPORT_SYMBOL_GPL(ata_host_detach);
6200 EXPORT_SYMBOL_GPL(ata_sg_init);
6201 EXPORT_SYMBOL_GPL(ata_qc_complete);
6202 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
6203 EXPORT_SYMBOL_GPL(sata_print_link_status);
6204 EXPORT_SYMBOL_GPL(atapi_cmd_type);
6205 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
6206 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6207 EXPORT_SYMBOL_GPL(ata_pack_xfermask);
6208 EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
6209 EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
6210 EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
6211 EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
6212 EXPORT_SYMBOL_GPL(ata_mode_string);
6213 EXPORT_SYMBOL_GPL(ata_id_xfermask);
6214 EXPORT_SYMBOL_GPL(ata_port_start);
6215 EXPORT_SYMBOL_GPL(ata_do_set_mode);
6216 EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6217 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
6218 EXPORT_SYMBOL_GPL(ata_port_probe);
6219 EXPORT_SYMBOL_GPL(ata_dev_disable);
6220 EXPORT_SYMBOL_GPL(sata_set_spd);
6221 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6222 EXPORT_SYMBOL_GPL(sata_link_debounce);
6223 EXPORT_SYMBOL_GPL(sata_link_resume);
6224 EXPORT_SYMBOL_GPL(ata_std_prereset);
6225 EXPORT_SYMBOL_GPL(sata_link_hardreset);
6226 EXPORT_SYMBOL_GPL(sata_std_hardreset);
6227 EXPORT_SYMBOL_GPL(ata_std_postreset);
6228 EXPORT_SYMBOL_GPL(ata_dev_classify);
6229 EXPORT_SYMBOL_GPL(ata_dev_pair);
6230 EXPORT_SYMBOL_GPL(ata_port_disable);
6231 EXPORT_SYMBOL_GPL(ata_ratelimit);
6232 EXPORT_SYMBOL_GPL(ata_wait_register);
6233 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
6234 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
6235 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6236 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6237 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6238 EXPORT_SYMBOL_GPL(sata_scr_valid);
6239 EXPORT_SYMBOL_GPL(sata_scr_read);
6240 EXPORT_SYMBOL_GPL(sata_scr_write);
6241 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
6242 EXPORT_SYMBOL_GPL(ata_link_online);
6243 EXPORT_SYMBOL_GPL(ata_link_offline);
6245 EXPORT_SYMBOL_GPL(ata_host_suspend);
6246 EXPORT_SYMBOL_GPL(ata_host_resume);
6247 #endif /* CONFIG_PM */
6248 EXPORT_SYMBOL_GPL(ata_id_string);
6249 EXPORT_SYMBOL_GPL(ata_id_c_string);
6250 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
6252 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6253 EXPORT_SYMBOL_GPL(ata_timing_find_mode);
6254 EXPORT_SYMBOL_GPL(ata_timing_compute);
6255 EXPORT_SYMBOL_GPL(ata_timing_merge);
6256 EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
6259 EXPORT_SYMBOL_GPL(pci_test_config_bits);
6260 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6262 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
6263 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
6264 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
6265 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6266 #endif /* CONFIG_PM */
6267 #endif /* CONFIG_PCI */
6269 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
6270 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
6271 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6272 EXPORT_SYMBOL_GPL(ata_port_desc);
6274 EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
6275 #endif /* CONFIG_PCI */
6276 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6277 EXPORT_SYMBOL_GPL(ata_link_abort);
6278 EXPORT_SYMBOL_GPL(ata_port_abort);
6279 EXPORT_SYMBOL_GPL(ata_port_freeze);
6280 EXPORT_SYMBOL_GPL(sata_async_notification);
6281 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
6282 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6283 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
6284 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6285 EXPORT_SYMBOL_GPL(ata_do_eh);
6286 EXPORT_SYMBOL_GPL(ata_std_error_handler);
6288 EXPORT_SYMBOL_GPL(ata_cable_40wire);
6289 EXPORT_SYMBOL_GPL(ata_cable_80wire);
6290 EXPORT_SYMBOL_GPL(ata_cable_unknown);
6291 EXPORT_SYMBOL_GPL(ata_cable_ignore);
6292 EXPORT_SYMBOL_GPL(ata_cable_sata);