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 const struct ata_port_operations sata_pmp_port_ops = {
90 .inherits = &sata_port_ops,
92 .pmp_prereset = ata_std_prereset,
93 .pmp_hardreset = sata_std_hardreset,
94 .pmp_postreset = ata_std_postreset,
95 .error_handler = sata_pmp_error_handler,
98 static unsigned int ata_dev_init_params(struct ata_device *dev,
99 u16 heads, u16 sectors);
100 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
101 static unsigned int ata_dev_set_feature(struct ata_device *dev,
102 u8 enable, u8 feature);
103 static void ata_dev_xfermask(struct ata_device *dev);
104 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
106 unsigned int ata_print_id = 1;
107 static struct workqueue_struct *ata_wq;
109 struct workqueue_struct *ata_aux_wq;
111 struct ata_force_param {
115 unsigned long xfer_mask;
116 unsigned int horkage_on;
117 unsigned int horkage_off;
120 struct ata_force_ent {
123 struct ata_force_param param;
126 static struct ata_force_ent *ata_force_tbl;
127 static int ata_force_tbl_size;
129 static char ata_force_param_buf[PAGE_SIZE] __initdata;
130 /* param_buf is thrown away after initialization, disallow read */
131 module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
132 MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/kernel-parameters.txt for details)");
134 int atapi_enabled = 1;
135 module_param(atapi_enabled, int, 0444);
136 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
138 static int atapi_dmadir = 0;
139 module_param(atapi_dmadir, int, 0444);
140 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
142 int atapi_passthru16 = 1;
143 module_param(atapi_passthru16, int, 0444);
144 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");
147 module_param_named(fua, libata_fua, int, 0444);
148 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
150 static int ata_ignore_hpa;
151 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
152 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
154 static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
155 module_param_named(dma, libata_dma_mask, int, 0444);
156 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
158 static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
159 module_param(ata_probe_timeout, int, 0444);
160 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
162 int libata_noacpi = 0;
163 module_param_named(noacpi, libata_noacpi, int, 0444);
164 MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set");
166 int libata_allow_tpm = 0;
167 module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
168 MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands");
170 MODULE_AUTHOR("Jeff Garzik");
171 MODULE_DESCRIPTION("Library module for ATA devices");
172 MODULE_LICENSE("GPL");
173 MODULE_VERSION(DRV_VERSION);
177 * ata_force_cbl - force cable type according to libata.force
178 * @ap: ATA port of interest
180 * Force cable type according to libata.force and whine about it.
181 * The last entry which has matching port number is used, so it
182 * can be specified as part of device force parameters. For
183 * example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
189 void ata_force_cbl(struct ata_port *ap)
193 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
194 const struct ata_force_ent *fe = &ata_force_tbl[i];
196 if (fe->port != -1 && fe->port != ap->print_id)
199 if (fe->param.cbl == ATA_CBL_NONE)
202 ap->cbl = fe->param.cbl;
203 ata_port_printk(ap, KERN_NOTICE,
204 "FORCE: cable set to %s\n", fe->param.name);
210 * ata_force_spd_limit - force SATA spd limit according to libata.force
211 * @link: ATA link of interest
213 * Force SATA spd limit according to libata.force and whine about
214 * it. When only the port part is specified (e.g. 1:), the limit
215 * applies to all links connected to both the host link and all
216 * fan-out ports connected via PMP. If the device part is
217 * specified as 0 (e.g. 1.00:), it specifies the first fan-out
218 * link not the host link. Device number 15 always points to the
219 * host link whether PMP is attached or not.
224 static void ata_force_spd_limit(struct ata_link *link)
228 if (ata_is_host_link(link))
233 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
234 const struct ata_force_ent *fe = &ata_force_tbl[i];
236 if (fe->port != -1 && fe->port != link->ap->print_id)
239 if (fe->device != -1 && fe->device != linkno)
242 if (!fe->param.spd_limit)
245 link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
246 ata_link_printk(link, KERN_NOTICE,
247 "FORCE: PHY spd limit set to %s\n", fe->param.name);
253 * ata_force_xfermask - force xfermask according to libata.force
254 * @dev: ATA device of interest
256 * Force xfer_mask according to libata.force and whine about it.
257 * For consistency with link selection, device number 15 selects
258 * the first device connected to the host link.
263 static void ata_force_xfermask(struct ata_device *dev)
265 int devno = dev->link->pmp + dev->devno;
266 int alt_devno = devno;
269 /* allow n.15 for the first device attached to host port */
270 if (ata_is_host_link(dev->link) && devno == 0)
273 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
274 const struct ata_force_ent *fe = &ata_force_tbl[i];
275 unsigned long pio_mask, mwdma_mask, udma_mask;
277 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
280 if (fe->device != -1 && fe->device != devno &&
281 fe->device != alt_devno)
284 if (!fe->param.xfer_mask)
287 ata_unpack_xfermask(fe->param.xfer_mask,
288 &pio_mask, &mwdma_mask, &udma_mask);
290 dev->udma_mask = udma_mask;
291 else if (mwdma_mask) {
293 dev->mwdma_mask = mwdma_mask;
297 dev->pio_mask = pio_mask;
300 ata_dev_printk(dev, KERN_NOTICE,
301 "FORCE: xfer_mask set to %s\n", fe->param.name);
307 * ata_force_horkage - force horkage according to libata.force
308 * @dev: ATA device of interest
310 * Force horkage according to libata.force and whine about it.
311 * For consistency with link selection, device number 15 selects
312 * the first device connected to the host link.
317 static void ata_force_horkage(struct ata_device *dev)
319 int devno = dev->link->pmp + dev->devno;
320 int alt_devno = devno;
323 /* allow n.15 for the first device attached to host port */
324 if (ata_is_host_link(dev->link) && devno == 0)
327 for (i = 0; i < ata_force_tbl_size; i++) {
328 const struct ata_force_ent *fe = &ata_force_tbl[i];
330 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
333 if (fe->device != -1 && fe->device != devno &&
334 fe->device != alt_devno)
337 if (!(~dev->horkage & fe->param.horkage_on) &&
338 !(dev->horkage & fe->param.horkage_off))
341 dev->horkage |= fe->param.horkage_on;
342 dev->horkage &= ~fe->param.horkage_off;
344 ata_dev_printk(dev, KERN_NOTICE,
345 "FORCE: horkage modified (%s)\n", fe->param.name);
350 * atapi_cmd_type - Determine ATAPI command type from SCSI opcode
351 * @opcode: SCSI opcode
353 * Determine ATAPI command type from @opcode.
359 * ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC}
361 int atapi_cmd_type(u8 opcode)
370 case GPCMD_WRITE_AND_VERIFY_10:
374 case GPCMD_READ_CD_MSF:
375 return ATAPI_READ_CD;
379 if (atapi_passthru16)
380 return ATAPI_PASS_THRU;
388 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
389 * @tf: Taskfile to convert
390 * @pmp: Port multiplier port
391 * @is_cmd: This FIS is for command
392 * @fis: Buffer into which data will output
394 * Converts a standard ATA taskfile to a Serial ATA
395 * FIS structure (Register - Host to Device).
398 * Inherited from caller.
400 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
402 fis[0] = 0x27; /* Register - Host to Device FIS */
403 fis[1] = pmp & 0xf; /* Port multiplier number*/
405 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
407 fis[2] = tf->command;
408 fis[3] = tf->feature;
415 fis[8] = tf->hob_lbal;
416 fis[9] = tf->hob_lbam;
417 fis[10] = tf->hob_lbah;
418 fis[11] = tf->hob_feature;
421 fis[13] = tf->hob_nsect;
432 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
433 * @fis: Buffer from which data will be input
434 * @tf: Taskfile to output
436 * Converts a serial ATA FIS structure to a standard ATA taskfile.
439 * Inherited from caller.
442 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
444 tf->command = fis[2]; /* status */
445 tf->feature = fis[3]; /* error */
452 tf->hob_lbal = fis[8];
453 tf->hob_lbam = fis[9];
454 tf->hob_lbah = fis[10];
457 tf->hob_nsect = fis[13];
460 static const u8 ata_rw_cmds[] = {
464 ATA_CMD_READ_MULTI_EXT,
465 ATA_CMD_WRITE_MULTI_EXT,
469 ATA_CMD_WRITE_MULTI_FUA_EXT,
473 ATA_CMD_PIO_READ_EXT,
474 ATA_CMD_PIO_WRITE_EXT,
487 ATA_CMD_WRITE_FUA_EXT
491 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
492 * @tf: command to examine and configure
493 * @dev: device tf belongs to
495 * Examine the device configuration and tf->flags to calculate
496 * the proper read/write commands and protocol to use.
501 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
505 int index, fua, lba48, write;
507 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
508 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
509 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
511 if (dev->flags & ATA_DFLAG_PIO) {
512 tf->protocol = ATA_PROT_PIO;
513 index = dev->multi_count ? 0 : 8;
514 } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
515 /* Unable to use DMA due to host limitation */
516 tf->protocol = ATA_PROT_PIO;
517 index = dev->multi_count ? 0 : 8;
519 tf->protocol = ATA_PROT_DMA;
523 cmd = ata_rw_cmds[index + fua + lba48 + write];
532 * ata_tf_read_block - Read block address from ATA taskfile
533 * @tf: ATA taskfile of interest
534 * @dev: ATA device @tf belongs to
539 * Read block address from @tf. This function can handle all
540 * three address formats - LBA, LBA48 and CHS. tf->protocol and
541 * flags select the address format to use.
544 * Block address read from @tf.
546 u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
550 if (tf->flags & ATA_TFLAG_LBA) {
551 if (tf->flags & ATA_TFLAG_LBA48) {
552 block |= (u64)tf->hob_lbah << 40;
553 block |= (u64)tf->hob_lbam << 32;
554 block |= tf->hob_lbal << 24;
556 block |= (tf->device & 0xf) << 24;
558 block |= tf->lbah << 16;
559 block |= tf->lbam << 8;
564 cyl = tf->lbam | (tf->lbah << 8);
565 head = tf->device & 0xf;
568 block = (cyl * dev->heads + head) * dev->sectors + sect;
575 * ata_build_rw_tf - Build ATA taskfile for given read/write request
576 * @tf: Target ATA taskfile
577 * @dev: ATA device @tf belongs to
578 * @block: Block address
579 * @n_block: Number of blocks
580 * @tf_flags: RW/FUA etc...
586 * Build ATA taskfile @tf for read/write request described by
587 * @block, @n_block, @tf_flags and @tag on @dev.
591 * 0 on success, -ERANGE if the request is too large for @dev,
592 * -EINVAL if the request is invalid.
594 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
595 u64 block, u32 n_block, unsigned int tf_flags,
598 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
599 tf->flags |= tf_flags;
601 if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
603 if (!lba_48_ok(block, n_block))
606 tf->protocol = ATA_PROT_NCQ;
607 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
609 if (tf->flags & ATA_TFLAG_WRITE)
610 tf->command = ATA_CMD_FPDMA_WRITE;
612 tf->command = ATA_CMD_FPDMA_READ;
614 tf->nsect = tag << 3;
615 tf->hob_feature = (n_block >> 8) & 0xff;
616 tf->feature = n_block & 0xff;
618 tf->hob_lbah = (block >> 40) & 0xff;
619 tf->hob_lbam = (block >> 32) & 0xff;
620 tf->hob_lbal = (block >> 24) & 0xff;
621 tf->lbah = (block >> 16) & 0xff;
622 tf->lbam = (block >> 8) & 0xff;
623 tf->lbal = block & 0xff;
626 if (tf->flags & ATA_TFLAG_FUA)
627 tf->device |= 1 << 7;
628 } else if (dev->flags & ATA_DFLAG_LBA) {
629 tf->flags |= ATA_TFLAG_LBA;
631 if (lba_28_ok(block, n_block)) {
633 tf->device |= (block >> 24) & 0xf;
634 } else if (lba_48_ok(block, n_block)) {
635 if (!(dev->flags & ATA_DFLAG_LBA48))
639 tf->flags |= ATA_TFLAG_LBA48;
641 tf->hob_nsect = (n_block >> 8) & 0xff;
643 tf->hob_lbah = (block >> 40) & 0xff;
644 tf->hob_lbam = (block >> 32) & 0xff;
645 tf->hob_lbal = (block >> 24) & 0xff;
647 /* request too large even for LBA48 */
650 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
653 tf->nsect = n_block & 0xff;
655 tf->lbah = (block >> 16) & 0xff;
656 tf->lbam = (block >> 8) & 0xff;
657 tf->lbal = block & 0xff;
659 tf->device |= ATA_LBA;
662 u32 sect, head, cyl, track;
664 /* The request -may- be too large for CHS addressing. */
665 if (!lba_28_ok(block, n_block))
668 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
671 /* Convert LBA to CHS */
672 track = (u32)block / dev->sectors;
673 cyl = track / dev->heads;
674 head = track % dev->heads;
675 sect = (u32)block % dev->sectors + 1;
677 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
678 (u32)block, track, cyl, head, sect);
680 /* Check whether the converted CHS can fit.
684 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
687 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
698 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
699 * @pio_mask: pio_mask
700 * @mwdma_mask: mwdma_mask
701 * @udma_mask: udma_mask
703 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
704 * unsigned int xfer_mask.
712 unsigned long ata_pack_xfermask(unsigned long pio_mask,
713 unsigned long mwdma_mask,
714 unsigned long udma_mask)
716 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
717 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
718 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
722 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
723 * @xfer_mask: xfer_mask to unpack
724 * @pio_mask: resulting pio_mask
725 * @mwdma_mask: resulting mwdma_mask
726 * @udma_mask: resulting udma_mask
728 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
729 * Any NULL distination masks will be ignored.
731 void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
732 unsigned long *mwdma_mask, unsigned long *udma_mask)
735 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
737 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
739 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
742 static const struct ata_xfer_ent {
746 { ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
747 { ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
748 { ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
753 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
754 * @xfer_mask: xfer_mask of interest
756 * Return matching XFER_* value for @xfer_mask. Only the highest
757 * bit of @xfer_mask is considered.
763 * Matching XFER_* value, 0xff if no match found.
765 u8 ata_xfer_mask2mode(unsigned long xfer_mask)
767 int highbit = fls(xfer_mask) - 1;
768 const struct ata_xfer_ent *ent;
770 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
771 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
772 return ent->base + highbit - ent->shift;
777 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
778 * @xfer_mode: XFER_* of interest
780 * Return matching xfer_mask for @xfer_mode.
786 * Matching xfer_mask, 0 if no match found.
788 unsigned long ata_xfer_mode2mask(u8 xfer_mode)
790 const struct ata_xfer_ent *ent;
792 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
793 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
794 return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
795 & ~((1 << ent->shift) - 1);
800 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
801 * @xfer_mode: XFER_* of interest
803 * Return matching xfer_shift for @xfer_mode.
809 * Matching xfer_shift, -1 if no match found.
811 int ata_xfer_mode2shift(unsigned long xfer_mode)
813 const struct ata_xfer_ent *ent;
815 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
816 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
822 * ata_mode_string - convert xfer_mask to string
823 * @xfer_mask: mask of bits supported; only highest bit counts.
825 * Determine string which represents the highest speed
826 * (highest bit in @modemask).
832 * Constant C string representing highest speed listed in
833 * @mode_mask, or the constant C string "<n/a>".
835 const char *ata_mode_string(unsigned long xfer_mask)
837 static const char * const xfer_mode_str[] = {
861 highbit = fls(xfer_mask) - 1;
862 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
863 return xfer_mode_str[highbit];
867 static const char *sata_spd_string(unsigned int spd)
869 static const char * const spd_str[] = {
874 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
876 return spd_str[spd - 1];
879 void ata_dev_disable(struct ata_device *dev)
881 if (ata_dev_enabled(dev)) {
882 if (ata_msg_drv(dev->link->ap))
883 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
884 ata_acpi_on_disable(dev);
885 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
891 static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
893 struct ata_link *link = dev->link;
894 struct ata_port *ap = link->ap;
896 unsigned int err_mask;
900 * disallow DIPM for drivers which haven't set
901 * ATA_FLAG_IPM. This is because when DIPM is enabled,
902 * phy ready will be set in the interrupt status on
903 * state changes, which will cause some drivers to
904 * think there are errors - additionally drivers will
905 * need to disable hot plug.
907 if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
908 ap->pm_policy = NOT_AVAILABLE;
913 * For DIPM, we will only enable it for the
916 * Why? Because Disks are too stupid to know that
917 * If the host rejects a request to go to SLUMBER
918 * they should retry at PARTIAL, and instead it
919 * just would give up. So, for medium_power to
920 * work at all, we need to only allow HIPM.
922 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
928 /* no restrictions on IPM transitions */
929 scontrol &= ~(0x3 << 8);
930 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
935 if (dev->flags & ATA_DFLAG_DIPM)
936 err_mask = ata_dev_set_feature(dev,
937 SETFEATURES_SATA_ENABLE, SATA_DIPM);
940 /* allow IPM to PARTIAL */
941 scontrol &= ~(0x1 << 8);
942 scontrol |= (0x2 << 8);
943 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
948 * we don't have to disable DIPM since IPM flags
949 * disallow transitions to SLUMBER, which effectively
950 * disable DIPM if it does not support PARTIAL
954 case MAX_PERFORMANCE:
955 /* disable all IPM transitions */
956 scontrol |= (0x3 << 8);
957 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
962 * we don't have to disable DIPM since IPM flags
963 * disallow all transitions which effectively
964 * disable DIPM anyway.
969 /* FIXME: handle SET FEATURES failure */
976 * ata_dev_enable_pm - enable SATA interface power management
977 * @dev: device to enable power management
978 * @policy: the link power management policy
980 * Enable SATA Interface power management. This will enable
981 * Device Interface Power Management (DIPM) for min_power
982 * policy, and then call driver specific callbacks for
983 * enabling Host Initiated Power management.
986 * Returns: -EINVAL if IPM is not supported, 0 otherwise.
988 void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
991 struct ata_port *ap = dev->link->ap;
993 /* set HIPM first, then DIPM */
994 if (ap->ops->enable_pm)
995 rc = ap->ops->enable_pm(ap, policy);
998 rc = ata_dev_set_dipm(dev, policy);
1002 ap->pm_policy = MAX_PERFORMANCE;
1004 ap->pm_policy = policy;
1005 return /* rc */; /* hopefully we can use 'rc' eventually */
1010 * ata_dev_disable_pm - disable SATA interface power management
1011 * @dev: device to disable power management
1013 * Disable SATA Interface power management. This will disable
1014 * Device Interface Power Management (DIPM) without changing
1015 * policy, call driver specific callbacks for disabling Host
1016 * Initiated Power management.
1021 static void ata_dev_disable_pm(struct ata_device *dev)
1023 struct ata_port *ap = dev->link->ap;
1025 ata_dev_set_dipm(dev, MAX_PERFORMANCE);
1026 if (ap->ops->disable_pm)
1027 ap->ops->disable_pm(ap);
1029 #endif /* CONFIG_PM */
1031 void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
1033 ap->pm_policy = policy;
1034 ap->link.eh_info.action |= ATA_EH_LPM;
1035 ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
1036 ata_port_schedule_eh(ap);
1040 static void ata_lpm_enable(struct ata_host *host)
1042 struct ata_link *link;
1043 struct ata_port *ap;
1044 struct ata_device *dev;
1047 for (i = 0; i < host->n_ports; i++) {
1048 ap = host->ports[i];
1049 ata_port_for_each_link(link, ap) {
1050 ata_link_for_each_dev(dev, link)
1051 ata_dev_disable_pm(dev);
1056 static void ata_lpm_disable(struct ata_host *host)
1060 for (i = 0; i < host->n_ports; i++) {
1061 struct ata_port *ap = host->ports[i];
1062 ata_lpm_schedule(ap, ap->pm_policy);
1065 #endif /* CONFIG_PM */
1068 * ata_dev_classify - determine device type based on ATA-spec signature
1069 * @tf: ATA taskfile register set for device to be identified
1071 * Determine from taskfile register contents whether a device is
1072 * ATA or ATAPI, as per "Signature and persistence" section
1073 * of ATA/PI spec (volume 1, sect 5.14).
1079 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
1080 * %ATA_DEV_UNKNOWN the event of failure.
1082 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
1084 /* Apple's open source Darwin code hints that some devices only
1085 * put a proper signature into the LBA mid/high registers,
1086 * So, we only check those. It's sufficient for uniqueness.
1088 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
1089 * signatures for ATA and ATAPI devices attached on SerialATA,
1090 * 0x3c/0xc3 and 0x69/0x96 respectively. However, SerialATA
1091 * spec has never mentioned about using different signatures
1092 * for ATA/ATAPI devices. Then, Serial ATA II: Port
1093 * Multiplier specification began to use 0x69/0x96 to identify
1094 * port multpliers and 0x3c/0xc3 to identify SEMB device.
1095 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
1096 * 0x69/0x96 shortly and described them as reserved for
1099 * We follow the current spec and consider that 0x69/0x96
1100 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
1102 if ((tf->lbam == 0) && (tf->lbah == 0)) {
1103 DPRINTK("found ATA device by sig\n");
1107 if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
1108 DPRINTK("found ATAPI device by sig\n");
1109 return ATA_DEV_ATAPI;
1112 if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
1113 DPRINTK("found PMP device by sig\n");
1117 if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
1118 printk(KERN_INFO "ata: SEMB device ignored\n");
1119 return ATA_DEV_SEMB_UNSUP; /* not yet */
1122 DPRINTK("unknown device\n");
1123 return ATA_DEV_UNKNOWN;
1127 * ata_id_string - Convert IDENTIFY DEVICE page into string
1128 * @id: IDENTIFY DEVICE results we will examine
1129 * @s: string into which data is output
1130 * @ofs: offset into identify device page
1131 * @len: length of string to return. must be an even number.
1133 * The strings in the IDENTIFY DEVICE page are broken up into
1134 * 16-bit chunks. Run through the string, and output each
1135 * 8-bit chunk linearly, regardless of platform.
1141 void ata_id_string(const u16 *id, unsigned char *s,
1142 unsigned int ofs, unsigned int len)
1161 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1162 * @id: IDENTIFY DEVICE results we will examine
1163 * @s: string into which data is output
1164 * @ofs: offset into identify device page
1165 * @len: length of string to return. must be an odd number.
1167 * This function is identical to ata_id_string except that it
1168 * trims trailing spaces and terminates the resulting string with
1169 * null. @len must be actual maximum length (even number) + 1.
1174 void ata_id_c_string(const u16 *id, unsigned char *s,
1175 unsigned int ofs, unsigned int len)
1179 WARN_ON(!(len & 1));
1181 ata_id_string(id, s, ofs, len - 1);
1183 p = s + strnlen(s, len - 1);
1184 while (p > s && p[-1] == ' ')
1189 static u64 ata_id_n_sectors(const u16 *id)
1191 if (ata_id_has_lba(id)) {
1192 if (ata_id_has_lba48(id))
1193 return ata_id_u64(id, 100);
1195 return ata_id_u32(id, 60);
1197 if (ata_id_current_chs_valid(id))
1198 return ata_id_u32(id, 57);
1200 return id[1] * id[3] * id[6];
1204 u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
1208 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
1209 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1210 sectors |= (tf->hob_lbal & 0xff) << 24;
1211 sectors |= (tf->lbah & 0xff) << 16;
1212 sectors |= (tf->lbam & 0xff) << 8;
1213 sectors |= (tf->lbal & 0xff);
1218 u64 ata_tf_to_lba(const struct ata_taskfile *tf)
1222 sectors |= (tf->device & 0x0f) << 24;
1223 sectors |= (tf->lbah & 0xff) << 16;
1224 sectors |= (tf->lbam & 0xff) << 8;
1225 sectors |= (tf->lbal & 0xff);
1231 * ata_read_native_max_address - Read native max address
1232 * @dev: target device
1233 * @max_sectors: out parameter for the result native max address
1235 * Perform an LBA48 or LBA28 native size query upon the device in
1239 * 0 on success, -EACCES if command is aborted by the drive.
1240 * -EIO on other errors.
1242 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
1244 unsigned int err_mask;
1245 struct ata_taskfile tf;
1246 int lba48 = ata_id_has_lba48(dev->id);
1248 ata_tf_init(dev, &tf);
1250 /* always clear all address registers */
1251 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1254 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
1255 tf.flags |= ATA_TFLAG_LBA48;
1257 tf.command = ATA_CMD_READ_NATIVE_MAX;
1259 tf.protocol |= ATA_PROT_NODATA;
1260 tf.device |= ATA_LBA;
1262 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1264 ata_dev_printk(dev, KERN_WARNING, "failed to read native "
1265 "max address (err_mask=0x%x)\n", err_mask);
1266 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
1272 *max_sectors = ata_tf_to_lba48(&tf) + 1;
1274 *max_sectors = ata_tf_to_lba(&tf) + 1;
1275 if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1281 * ata_set_max_sectors - Set max sectors
1282 * @dev: target device
1283 * @new_sectors: new max sectors value to set for the device
1285 * Set max sectors of @dev to @new_sectors.
1288 * 0 on success, -EACCES if command is aborted or denied (due to
1289 * previous non-volatile SET_MAX) by the drive. -EIO on other
1292 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
1294 unsigned int err_mask;
1295 struct ata_taskfile tf;
1296 int lba48 = ata_id_has_lba48(dev->id);
1300 ata_tf_init(dev, &tf);
1302 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1305 tf.command = ATA_CMD_SET_MAX_EXT;
1306 tf.flags |= ATA_TFLAG_LBA48;
1308 tf.hob_lbal = (new_sectors >> 24) & 0xff;
1309 tf.hob_lbam = (new_sectors >> 32) & 0xff;
1310 tf.hob_lbah = (new_sectors >> 40) & 0xff;
1312 tf.command = ATA_CMD_SET_MAX;
1314 tf.device |= (new_sectors >> 24) & 0xf;
1317 tf.protocol |= ATA_PROT_NODATA;
1318 tf.device |= ATA_LBA;
1320 tf.lbal = (new_sectors >> 0) & 0xff;
1321 tf.lbam = (new_sectors >> 8) & 0xff;
1322 tf.lbah = (new_sectors >> 16) & 0xff;
1324 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1326 ata_dev_printk(dev, KERN_WARNING, "failed to set "
1327 "max address (err_mask=0x%x)\n", err_mask);
1328 if (err_mask == AC_ERR_DEV &&
1329 (tf.feature & (ATA_ABORTED | ATA_IDNF)))
1338 * ata_hpa_resize - Resize a device with an HPA set
1339 * @dev: Device to resize
1341 * Read the size of an LBA28 or LBA48 disk with HPA features and resize
1342 * it if required to the full size of the media. The caller must check
1343 * the drive has the HPA feature set enabled.
1346 * 0 on success, -errno on failure.
1348 static int ata_hpa_resize(struct ata_device *dev)
1350 struct ata_eh_context *ehc = &dev->link->eh_context;
1351 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1352 u64 sectors = ata_id_n_sectors(dev->id);
1356 /* do we need to do it? */
1357 if (dev->class != ATA_DEV_ATA ||
1358 !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
1359 (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1362 /* read native max address */
1363 rc = ata_read_native_max_address(dev, &native_sectors);
1365 /* If device aborted the command or HPA isn't going to
1366 * be unlocked, skip HPA resizing.
1368 if (rc == -EACCES || !ata_ignore_hpa) {
1369 ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
1370 "broken, skipping HPA handling\n");
1371 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1373 /* we can continue if device aborted the command */
1381 /* nothing to do? */
1382 if (native_sectors <= sectors || !ata_ignore_hpa) {
1383 if (!print_info || native_sectors == sectors)
1386 if (native_sectors > sectors)
1387 ata_dev_printk(dev, KERN_INFO,
1388 "HPA detected: current %llu, native %llu\n",
1389 (unsigned long long)sectors,
1390 (unsigned long long)native_sectors);
1391 else if (native_sectors < sectors)
1392 ata_dev_printk(dev, KERN_WARNING,
1393 "native sectors (%llu) is smaller than "
1395 (unsigned long long)native_sectors,
1396 (unsigned long long)sectors);
1400 /* let's unlock HPA */
1401 rc = ata_set_max_sectors(dev, native_sectors);
1402 if (rc == -EACCES) {
1403 /* if device aborted the command, skip HPA resizing */
1404 ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
1405 "(%llu -> %llu), skipping HPA handling\n",
1406 (unsigned long long)sectors,
1407 (unsigned long long)native_sectors);
1408 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1413 /* re-read IDENTIFY data */
1414 rc = ata_dev_reread_id(dev, 0);
1416 ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
1417 "data after HPA resizing\n");
1422 u64 new_sectors = ata_id_n_sectors(dev->id);
1423 ata_dev_printk(dev, KERN_INFO,
1424 "HPA unlocked: %llu -> %llu, native %llu\n",
1425 (unsigned long long)sectors,
1426 (unsigned long long)new_sectors,
1427 (unsigned long long)native_sectors);
1434 * ata_dump_id - IDENTIFY DEVICE info debugging output
1435 * @id: IDENTIFY DEVICE page to dump
1437 * Dump selected 16-bit words from the given IDENTIFY DEVICE
1444 static inline void ata_dump_id(const u16 *id)
1446 DPRINTK("49==0x%04x "
1456 DPRINTK("80==0x%04x "
1466 DPRINTK("88==0x%04x "
1473 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1474 * @id: IDENTIFY data to compute xfer mask from
1476 * Compute the xfermask for this device. This is not as trivial
1477 * as it seems if we must consider early devices correctly.
1479 * FIXME: pre IDE drive timing (do we care ?).
1487 unsigned long ata_id_xfermask(const u16 *id)
1489 unsigned long pio_mask, mwdma_mask, udma_mask;
1491 /* Usual case. Word 53 indicates word 64 is valid */
1492 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1493 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1497 /* If word 64 isn't valid then Word 51 high byte holds
1498 * the PIO timing number for the maximum. Turn it into
1501 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1502 if (mode < 5) /* Valid PIO range */
1503 pio_mask = (2 << mode) - 1;
1507 /* But wait.. there's more. Design your standards by
1508 * committee and you too can get a free iordy field to
1509 * process. However its the speeds not the modes that
1510 * are supported... Note drivers using the timing API
1511 * will get this right anyway
1515 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1517 if (ata_id_is_cfa(id)) {
1519 * Process compact flash extended modes
1521 int pio = id[163] & 0x7;
1522 int dma = (id[163] >> 3) & 7;
1525 pio_mask |= (1 << 5);
1527 pio_mask |= (1 << 6);
1529 mwdma_mask |= (1 << 3);
1531 mwdma_mask |= (1 << 4);
1535 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1536 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1538 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1542 * ata_pio_queue_task - Queue port_task
1543 * @ap: The ata_port to queue port_task for
1544 * @fn: workqueue function to be scheduled
1545 * @data: data for @fn to use
1546 * @delay: delay time for workqueue function
1548 * Schedule @fn(@data) for execution after @delay jiffies using
1549 * port_task. There is one port_task per port and it's the
1550 * user(low level driver)'s responsibility to make sure that only
1551 * one task is active at any given time.
1553 * libata core layer takes care of synchronization between
1554 * port_task and EH. ata_pio_queue_task() may be ignored for EH
1558 * Inherited from caller.
1560 void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
1562 ap->port_task_data = data;
1564 /* may fail if ata_port_flush_task() in progress */
1565 queue_delayed_work(ata_wq, &ap->port_task, delay);
1569 * ata_port_flush_task - Flush port_task
1570 * @ap: The ata_port to flush port_task for
1572 * After this function completes, port_task is guranteed not to
1573 * be running or scheduled.
1576 * Kernel thread context (may sleep)
1578 void ata_port_flush_task(struct ata_port *ap)
1582 cancel_rearming_delayed_work(&ap->port_task);
1584 if (ata_msg_ctl(ap))
1585 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
1588 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1590 struct completion *waiting = qc->private_data;
1596 * ata_exec_internal_sg - execute libata internal command
1597 * @dev: Device to which the command is sent
1598 * @tf: Taskfile registers for the command and the result
1599 * @cdb: CDB for packet command
1600 * @dma_dir: Data tranfer direction of the command
1601 * @sgl: sg list for the data buffer of the command
1602 * @n_elem: Number of sg entries
1603 * @timeout: Timeout in msecs (0 for default)
1605 * Executes libata internal command with timeout. @tf contains
1606 * command on entry and result on return. Timeout and error
1607 * conditions are reported via return value. No recovery action
1608 * is taken after a command times out. It's caller's duty to
1609 * clean up after timeout.
1612 * None. Should be called with kernel context, might sleep.
1615 * Zero on success, AC_ERR_* mask on failure
1617 unsigned ata_exec_internal_sg(struct ata_device *dev,
1618 struct ata_taskfile *tf, const u8 *cdb,
1619 int dma_dir, struct scatterlist *sgl,
1620 unsigned int n_elem, unsigned long timeout)
1622 struct ata_link *link = dev->link;
1623 struct ata_port *ap = link->ap;
1624 u8 command = tf->command;
1625 struct ata_queued_cmd *qc;
1626 unsigned int tag, preempted_tag;
1627 u32 preempted_sactive, preempted_qc_active;
1628 int preempted_nr_active_links;
1629 DECLARE_COMPLETION_ONSTACK(wait);
1630 unsigned long flags;
1631 unsigned int err_mask;
1634 spin_lock_irqsave(ap->lock, flags);
1636 /* no internal command while frozen */
1637 if (ap->pflags & ATA_PFLAG_FROZEN) {
1638 spin_unlock_irqrestore(ap->lock, flags);
1639 return AC_ERR_SYSTEM;
1642 /* initialize internal qc */
1644 /* XXX: Tag 0 is used for drivers with legacy EH as some
1645 * drivers choke if any other tag is given. This breaks
1646 * ata_tag_internal() test for those drivers. Don't use new
1647 * EH stuff without converting to it.
1649 if (ap->ops->error_handler)
1650 tag = ATA_TAG_INTERNAL;
1654 if (test_and_set_bit(tag, &ap->qc_allocated))
1656 qc = __ata_qc_from_tag(ap, tag);
1664 preempted_tag = link->active_tag;
1665 preempted_sactive = link->sactive;
1666 preempted_qc_active = ap->qc_active;
1667 preempted_nr_active_links = ap->nr_active_links;
1668 link->active_tag = ATA_TAG_POISON;
1671 ap->nr_active_links = 0;
1673 /* prepare & issue qc */
1676 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1677 qc->flags |= ATA_QCFLAG_RESULT_TF;
1678 qc->dma_dir = dma_dir;
1679 if (dma_dir != DMA_NONE) {
1680 unsigned int i, buflen = 0;
1681 struct scatterlist *sg;
1683 for_each_sg(sgl, sg, n_elem, i)
1684 buflen += sg->length;
1686 ata_sg_init(qc, sgl, n_elem);
1687 qc->nbytes = buflen;
1690 qc->private_data = &wait;
1691 qc->complete_fn = ata_qc_complete_internal;
1695 spin_unlock_irqrestore(ap->lock, flags);
1698 timeout = ata_probe_timeout * 1000 / HZ;
1700 rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1702 ata_port_flush_task(ap);
1705 spin_lock_irqsave(ap->lock, flags);
1707 /* We're racing with irq here. If we lose, the
1708 * following test prevents us from completing the qc
1709 * twice. If we win, the port is frozen and will be
1710 * cleaned up by ->post_internal_cmd().
1712 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1713 qc->err_mask |= AC_ERR_TIMEOUT;
1715 if (ap->ops->error_handler)
1716 ata_port_freeze(ap);
1718 ata_qc_complete(qc);
1720 if (ata_msg_warn(ap))
1721 ata_dev_printk(dev, KERN_WARNING,
1722 "qc timeout (cmd 0x%x)\n", command);
1725 spin_unlock_irqrestore(ap->lock, flags);
1728 /* do post_internal_cmd */
1729 if (ap->ops->post_internal_cmd)
1730 ap->ops->post_internal_cmd(qc);
1732 /* perform minimal error analysis */
1733 if (qc->flags & ATA_QCFLAG_FAILED) {
1734 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1735 qc->err_mask |= AC_ERR_DEV;
1738 qc->err_mask |= AC_ERR_OTHER;
1740 if (qc->err_mask & ~AC_ERR_OTHER)
1741 qc->err_mask &= ~AC_ERR_OTHER;
1745 spin_lock_irqsave(ap->lock, flags);
1747 *tf = qc->result_tf;
1748 err_mask = qc->err_mask;
1751 link->active_tag = preempted_tag;
1752 link->sactive = preempted_sactive;
1753 ap->qc_active = preempted_qc_active;
1754 ap->nr_active_links = preempted_nr_active_links;
1756 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1757 * Until those drivers are fixed, we detect the condition
1758 * here, fail the command with AC_ERR_SYSTEM and reenable the
1761 * Note that this doesn't change any behavior as internal
1762 * command failure results in disabling the device in the
1763 * higher layer for LLDDs without new reset/EH callbacks.
1765 * Kill the following code as soon as those drivers are fixed.
1767 if (ap->flags & ATA_FLAG_DISABLED) {
1768 err_mask |= AC_ERR_SYSTEM;
1772 spin_unlock_irqrestore(ap->lock, flags);
1778 * ata_exec_internal - execute libata internal command
1779 * @dev: Device to which the command is sent
1780 * @tf: Taskfile registers for the command and the result
1781 * @cdb: CDB for packet command
1782 * @dma_dir: Data tranfer direction of the command
1783 * @buf: Data buffer of the command
1784 * @buflen: Length of data buffer
1785 * @timeout: Timeout in msecs (0 for default)
1787 * Wrapper around ata_exec_internal_sg() which takes simple
1788 * buffer instead of sg list.
1791 * None. Should be called with kernel context, might sleep.
1794 * Zero on success, AC_ERR_* mask on failure
1796 unsigned ata_exec_internal(struct ata_device *dev,
1797 struct ata_taskfile *tf, const u8 *cdb,
1798 int dma_dir, void *buf, unsigned int buflen,
1799 unsigned long timeout)
1801 struct scatterlist *psg = NULL, sg;
1802 unsigned int n_elem = 0;
1804 if (dma_dir != DMA_NONE) {
1806 sg_init_one(&sg, buf, buflen);
1811 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
1816 * ata_do_simple_cmd - execute simple internal command
1817 * @dev: Device to which the command is sent
1818 * @cmd: Opcode to execute
1820 * Execute a 'simple' command, that only consists of the opcode
1821 * 'cmd' itself, without filling any other registers
1824 * Kernel thread context (may sleep).
1827 * Zero on success, AC_ERR_* mask on failure
1829 unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1831 struct ata_taskfile tf;
1833 ata_tf_init(dev, &tf);
1836 tf.flags |= ATA_TFLAG_DEVICE;
1837 tf.protocol = ATA_PROT_NODATA;
1839 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1843 * ata_pio_need_iordy - check if iordy needed
1846 * Check if the current speed of the device requires IORDY. Used
1847 * by various controllers for chip configuration.
1850 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1852 /* Controller doesn't support IORDY. Probably a pointless check
1853 as the caller should know this */
1854 if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1856 /* PIO3 and higher it is mandatory */
1857 if (adev->pio_mode > XFER_PIO_2)
1859 /* We turn it on when possible */
1860 if (ata_id_has_iordy(adev->id))
1866 * ata_pio_mask_no_iordy - Return the non IORDY mask
1869 * Compute the highest mode possible if we are not using iordy. Return
1870 * -1 if no iordy mode is available.
1873 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1875 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1876 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1877 u16 pio = adev->id[ATA_ID_EIDE_PIO];
1878 /* Is the speed faster than the drive allows non IORDY ? */
1880 /* This is cycle times not frequency - watch the logic! */
1881 if (pio > 240) /* PIO2 is 240nS per cycle */
1882 return 3 << ATA_SHIFT_PIO;
1883 return 7 << ATA_SHIFT_PIO;
1886 return 3 << ATA_SHIFT_PIO;
1890 * ata_dev_read_id - Read ID data from the specified device
1891 * @dev: target device
1892 * @p_class: pointer to class of the target device (may be changed)
1893 * @flags: ATA_READID_* flags
1894 * @id: buffer to read IDENTIFY data into
1896 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1897 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1898 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1899 * for pre-ATA4 drives.
1901 * FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1902 * now we abort if we hit that case.
1905 * Kernel thread context (may sleep)
1908 * 0 on success, -errno otherwise.
1910 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1911 unsigned int flags, u16 *id)
1913 struct ata_port *ap = dev->link->ap;
1914 unsigned int class = *p_class;
1915 struct ata_taskfile tf;
1916 unsigned int err_mask = 0;
1918 int may_fallback = 1, tried_spinup = 0;
1921 if (ata_msg_ctl(ap))
1922 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
1925 ata_tf_init(dev, &tf);
1929 tf.command = ATA_CMD_ID_ATA;
1932 tf.command = ATA_CMD_ID_ATAPI;
1936 reason = "unsupported class";
1940 tf.protocol = ATA_PROT_PIO;
1942 /* Some devices choke if TF registers contain garbage. Make
1943 * sure those are properly initialized.
1945 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1947 /* Device presence detection is unreliable on some
1948 * controllers. Always poll IDENTIFY if available.
1950 tf.flags |= ATA_TFLAG_POLLING;
1952 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1953 id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1955 if (err_mask & AC_ERR_NODEV_HINT) {
1956 ata_dev_printk(dev, KERN_DEBUG,
1957 "NODEV after polling detection\n");
1961 if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
1962 /* Device or controller might have reported
1963 * the wrong device class. Give a shot at the
1964 * other IDENTIFY if the current one is
1965 * aborted by the device.
1970 if (class == ATA_DEV_ATA)
1971 class = ATA_DEV_ATAPI;
1973 class = ATA_DEV_ATA;
1977 /* Control reaches here iff the device aborted
1978 * both flavors of IDENTIFYs which happens
1979 * sometimes with phantom devices.
1981 ata_dev_printk(dev, KERN_DEBUG,
1982 "both IDENTIFYs aborted, assuming NODEV\n");
1987 reason = "I/O error";
1991 /* Falling back doesn't make sense if ID data was read
1992 * successfully at least once.
1996 swap_buf_le16(id, ATA_ID_WORDS);
2000 reason = "device reports invalid type";
2002 if (class == ATA_DEV_ATA) {
2003 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
2006 if (ata_id_is_ata(id))
2010 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
2013 * Drive powered-up in standby mode, and requires a specific
2014 * SET_FEATURES spin-up subcommand before it will accept
2015 * anything other than the original IDENTIFY command.
2017 err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2018 if (err_mask && id[2] != 0x738c) {
2020 reason = "SPINUP failed";
2024 * If the drive initially returned incomplete IDENTIFY info,
2025 * we now must reissue the IDENTIFY command.
2027 if (id[2] == 0x37c8)
2031 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2033 * The exact sequence expected by certain pre-ATA4 drives is:
2035 * IDENTIFY (optional in early ATA)
2036 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2038 * Some drives were very specific about that exact sequence.
2040 * Note that ATA4 says lba is mandatory so the second check
2041 * shoud never trigger.
2043 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
2044 err_mask = ata_dev_init_params(dev, id[3], id[6]);
2047 reason = "INIT_DEV_PARAMS failed";
2051 /* current CHS translation info (id[53-58]) might be
2052 * changed. reread the identify device info.
2054 flags &= ~ATA_READID_POSTRESET;
2064 if (ata_msg_warn(ap))
2065 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
2066 "(%s, err_mask=0x%x)\n", reason, err_mask);
2070 static inline u8 ata_dev_knobble(struct ata_device *dev)
2072 struct ata_port *ap = dev->link->ap;
2073 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2076 static void ata_dev_config_ncq(struct ata_device *dev,
2077 char *desc, size_t desc_sz)
2079 struct ata_port *ap = dev->link->ap;
2080 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2082 if (!ata_id_has_ncq(dev->id)) {
2086 if (dev->horkage & ATA_HORKAGE_NONCQ) {
2087 snprintf(desc, desc_sz, "NCQ (not used)");
2090 if (ap->flags & ATA_FLAG_NCQ) {
2091 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2092 dev->flags |= ATA_DFLAG_NCQ;
2095 if (hdepth >= ddepth)
2096 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
2098 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
2102 * ata_dev_configure - Configure the specified ATA/ATAPI device
2103 * @dev: Target device to configure
2105 * Configure @dev according to @dev->id. Generic and low-level
2106 * driver specific fixups are also applied.
2109 * Kernel thread context (may sleep)
2112 * 0 on success, -errno otherwise
2114 int ata_dev_configure(struct ata_device *dev)
2116 struct ata_port *ap = dev->link->ap;
2117 struct ata_eh_context *ehc = &dev->link->eh_context;
2118 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2119 const u16 *id = dev->id;
2120 unsigned long xfer_mask;
2121 char revbuf[7]; /* XYZ-99\0 */
2122 char fwrevbuf[ATA_ID_FW_REV_LEN+1];
2123 char modelbuf[ATA_ID_PROD_LEN+1];
2126 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2127 ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2132 if (ata_msg_probe(ap))
2133 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
2136 dev->horkage |= ata_dev_blacklisted(dev);
2137 ata_force_horkage(dev);
2139 /* let ACPI work its magic */
2140 rc = ata_acpi_on_devcfg(dev);
2144 /* massage HPA, do it early as it might change IDENTIFY data */
2145 rc = ata_hpa_resize(dev);
2149 /* print device capabilities */
2150 if (ata_msg_probe(ap))
2151 ata_dev_printk(dev, KERN_DEBUG,
2152 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
2153 "85:%04x 86:%04x 87:%04x 88:%04x\n",
2155 id[49], id[82], id[83], id[84],
2156 id[85], id[86], id[87], id[88]);
2158 /* initialize to-be-configured parameters */
2159 dev->flags &= ~ATA_DFLAG_CFG_MASK;
2160 dev->max_sectors = 0;
2168 * common ATA, ATAPI feature tests
2171 /* find max transfer mode; for printk only */
2172 xfer_mask = ata_id_xfermask(id);
2174 if (ata_msg_probe(ap))
2177 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
2178 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
2181 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
2184 /* ATA-specific feature tests */
2185 if (dev->class == ATA_DEV_ATA) {
2186 if (ata_id_is_cfa(id)) {
2187 if (id[162] & 1) /* CPRM may make this media unusable */
2188 ata_dev_printk(dev, KERN_WARNING,
2189 "supports DRM functions and may "
2190 "not be fully accessable.\n");
2191 snprintf(revbuf, 7, "CFA");
2193 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2194 /* Warn the user if the device has TPM extensions */
2195 if (ata_id_has_tpm(id))
2196 ata_dev_printk(dev, KERN_WARNING,
2197 "supports DRM functions and may "
2198 "not be fully accessable.\n");
2201 dev->n_sectors = ata_id_n_sectors(id);
2203 if (dev->id[59] & 0x100)
2204 dev->multi_count = dev->id[59] & 0xff;
2206 if (ata_id_has_lba(id)) {
2207 const char *lba_desc;
2211 dev->flags |= ATA_DFLAG_LBA;
2212 if (ata_id_has_lba48(id)) {
2213 dev->flags |= ATA_DFLAG_LBA48;
2216 if (dev->n_sectors >= (1UL << 28) &&
2217 ata_id_has_flush_ext(id))
2218 dev->flags |= ATA_DFLAG_FLUSH_EXT;
2222 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
2224 /* print device info to dmesg */
2225 if (ata_msg_drv(ap) && print_info) {
2226 ata_dev_printk(dev, KERN_INFO,
2227 "%s: %s, %s, max %s\n",
2228 revbuf, modelbuf, fwrevbuf,
2229 ata_mode_string(xfer_mask));
2230 ata_dev_printk(dev, KERN_INFO,
2231 "%Lu sectors, multi %u: %s %s\n",
2232 (unsigned long long)dev->n_sectors,
2233 dev->multi_count, lba_desc, ncq_desc);
2238 /* Default translation */
2239 dev->cylinders = id[1];
2241 dev->sectors = id[6];
2243 if (ata_id_current_chs_valid(id)) {
2244 /* Current CHS translation is valid. */
2245 dev->cylinders = id[54];
2246 dev->heads = id[55];
2247 dev->sectors = id[56];
2250 /* print device info to dmesg */
2251 if (ata_msg_drv(ap) && print_info) {
2252 ata_dev_printk(dev, KERN_INFO,
2253 "%s: %s, %s, max %s\n",
2254 revbuf, modelbuf, fwrevbuf,
2255 ata_mode_string(xfer_mask));
2256 ata_dev_printk(dev, KERN_INFO,
2257 "%Lu sectors, multi %u, CHS %u/%u/%u\n",
2258 (unsigned long long)dev->n_sectors,
2259 dev->multi_count, dev->cylinders,
2260 dev->heads, dev->sectors);
2267 /* ATAPI-specific feature tests */
2268 else if (dev->class == ATA_DEV_ATAPI) {
2269 const char *cdb_intr_string = "";
2270 const char *atapi_an_string = "";
2271 const char *dma_dir_string = "";
2274 rc = atapi_cdb_len(id);
2275 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2276 if (ata_msg_warn(ap))
2277 ata_dev_printk(dev, KERN_WARNING,
2278 "unsupported CDB len\n");
2282 dev->cdb_len = (unsigned int) rc;
2284 /* Enable ATAPI AN if both the host and device have
2285 * the support. If PMP is attached, SNTF is required
2286 * to enable ATAPI AN to discern between PHY status
2287 * changed notifications and ATAPI ANs.
2289 if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
2290 (!ap->nr_pmp_links ||
2291 sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2292 unsigned int err_mask;
2294 /* issue SET feature command to turn this on */
2295 err_mask = ata_dev_set_feature(dev,
2296 SETFEATURES_SATA_ENABLE, SATA_AN);
2298 ata_dev_printk(dev, KERN_ERR,
2299 "failed to enable ATAPI AN "
2300 "(err_mask=0x%x)\n", err_mask);
2302 dev->flags |= ATA_DFLAG_AN;
2303 atapi_an_string = ", ATAPI AN";
2307 if (ata_id_cdb_intr(dev->id)) {
2308 dev->flags |= ATA_DFLAG_CDB_INTR;
2309 cdb_intr_string = ", CDB intr";
2312 if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
2313 dev->flags |= ATA_DFLAG_DMADIR;
2314 dma_dir_string = ", DMADIR";
2317 /* print device info to dmesg */
2318 if (ata_msg_drv(ap) && print_info)
2319 ata_dev_printk(dev, KERN_INFO,
2320 "ATAPI: %s, %s, max %s%s%s%s\n",
2322 ata_mode_string(xfer_mask),
2323 cdb_intr_string, atapi_an_string,
2327 /* determine max_sectors */
2328 dev->max_sectors = ATA_MAX_SECTORS;
2329 if (dev->flags & ATA_DFLAG_LBA48)
2330 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2332 if (!(dev->horkage & ATA_HORKAGE_IPM)) {
2333 if (ata_id_has_hipm(dev->id))
2334 dev->flags |= ATA_DFLAG_HIPM;
2335 if (ata_id_has_dipm(dev->id))
2336 dev->flags |= ATA_DFLAG_DIPM;
2339 /* Limit PATA drive on SATA cable bridge transfers to udma5,
2341 if (ata_dev_knobble(dev)) {
2342 if (ata_msg_drv(ap) && print_info)
2343 ata_dev_printk(dev, KERN_INFO,
2344 "applying bridge limits\n");
2345 dev->udma_mask &= ATA_UDMA5;
2346 dev->max_sectors = ATA_MAX_SECTORS;
2349 if ((dev->class == ATA_DEV_ATAPI) &&
2350 (atapi_command_packet_set(id) == TYPE_TAPE)) {
2351 dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2352 dev->horkage |= ATA_HORKAGE_STUCK_ERR;
2355 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2356 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2359 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
2360 dev->horkage |= ATA_HORKAGE_IPM;
2362 /* reset link pm_policy for this port to no pm */
2363 ap->pm_policy = MAX_PERFORMANCE;
2366 if (ap->ops->dev_config)
2367 ap->ops->dev_config(dev);
2369 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2370 /* Let the user know. We don't want to disallow opens for
2371 rescue purposes, or in case the vendor is just a blithering
2372 idiot. Do this after the dev_config call as some controllers
2373 with buggy firmware may want to avoid reporting false device
2377 ata_dev_printk(dev, KERN_WARNING,
2378 "Drive reports diagnostics failure. This may indicate a drive\n");
2379 ata_dev_printk(dev, KERN_WARNING,
2380 "fault or invalid emulation. Contact drive vendor for information.\n");
2387 if (ata_msg_probe(ap))
2388 ata_dev_printk(dev, KERN_DEBUG,
2389 "%s: EXIT, err\n", __func__);
2394 * ata_cable_40wire - return 40 wire cable type
2397 * Helper method for drivers which want to hardwire 40 wire cable
2401 int ata_cable_40wire(struct ata_port *ap)
2403 return ATA_CBL_PATA40;
2407 * ata_cable_80wire - return 80 wire cable type
2410 * Helper method for drivers which want to hardwire 80 wire cable
2414 int ata_cable_80wire(struct ata_port *ap)
2416 return ATA_CBL_PATA80;
2420 * ata_cable_unknown - return unknown PATA cable.
2423 * Helper method for drivers which have no PATA cable detection.
2426 int ata_cable_unknown(struct ata_port *ap)
2428 return ATA_CBL_PATA_UNK;
2432 * ata_cable_ignore - return ignored PATA cable.
2435 * Helper method for drivers which don't use cable type to limit
2438 int ata_cable_ignore(struct ata_port *ap)
2440 return ATA_CBL_PATA_IGN;
2444 * ata_cable_sata - return SATA cable type
2447 * Helper method for drivers which have SATA cables
2450 int ata_cable_sata(struct ata_port *ap)
2452 return ATA_CBL_SATA;
2456 * ata_bus_probe - Reset and probe ATA bus
2459 * Master ATA bus probing function. Initiates a hardware-dependent
2460 * bus reset, then attempts to identify any devices found on
2464 * PCI/etc. bus probe sem.
2467 * Zero on success, negative errno otherwise.
2470 int ata_bus_probe(struct ata_port *ap)
2472 unsigned int classes[ATA_MAX_DEVICES];
2473 int tries[ATA_MAX_DEVICES];
2475 struct ata_device *dev;
2479 ata_link_for_each_dev(dev, &ap->link)
2480 tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2483 ata_link_for_each_dev(dev, &ap->link) {
2484 /* If we issue an SRST then an ATA drive (not ATAPI)
2485 * may change configuration and be in PIO0 timing. If
2486 * we do a hard reset (or are coming from power on)
2487 * this is true for ATA or ATAPI. Until we've set a
2488 * suitable controller mode we should not touch the
2489 * bus as we may be talking too fast.
2491 dev->pio_mode = XFER_PIO_0;
2493 /* If the controller has a pio mode setup function
2494 * then use it to set the chipset to rights. Don't
2495 * touch the DMA setup as that will be dealt with when
2496 * configuring devices.
2498 if (ap->ops->set_piomode)
2499 ap->ops->set_piomode(ap, dev);
2502 /* reset and determine device classes */
2503 ap->ops->phy_reset(ap);
2505 ata_link_for_each_dev(dev, &ap->link) {
2506 if (!(ap->flags & ATA_FLAG_DISABLED) &&
2507 dev->class != ATA_DEV_UNKNOWN)
2508 classes[dev->devno] = dev->class;
2510 classes[dev->devno] = ATA_DEV_NONE;
2512 dev->class = ATA_DEV_UNKNOWN;
2517 /* read IDENTIFY page and configure devices. We have to do the identify
2518 specific sequence bass-ackwards so that PDIAG- is released by
2521 ata_link_for_each_dev_reverse(dev, &ap->link) {
2522 if (tries[dev->devno])
2523 dev->class = classes[dev->devno];
2525 if (!ata_dev_enabled(dev))
2528 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2534 /* Now ask for the cable type as PDIAG- should have been released */
2535 if (ap->ops->cable_detect)
2536 ap->cbl = ap->ops->cable_detect(ap);
2538 /* We may have SATA bridge glue hiding here irrespective of the
2539 reported cable types and sensed types */
2540 ata_link_for_each_dev(dev, &ap->link) {
2541 if (!ata_dev_enabled(dev))
2543 /* SATA drives indicate we have a bridge. We don't know which
2544 end of the link the bridge is which is a problem */
2545 if (ata_id_is_sata(dev->id))
2546 ap->cbl = ATA_CBL_SATA;
2549 /* After the identify sequence we can now set up the devices. We do
2550 this in the normal order so that the user doesn't get confused */
2552 ata_link_for_each_dev(dev, &ap->link) {
2553 if (!ata_dev_enabled(dev))
2556 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2557 rc = ata_dev_configure(dev);
2558 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2563 /* configure transfer mode */
2564 rc = ata_set_mode(&ap->link, &dev);
2568 ata_link_for_each_dev(dev, &ap->link)
2569 if (ata_dev_enabled(dev))
2572 /* no device present, disable port */
2573 ata_port_disable(ap);
2577 tries[dev->devno]--;
2581 /* eeek, something went very wrong, give up */
2582 tries[dev->devno] = 0;
2586 /* give it just one more chance */
2587 tries[dev->devno] = min(tries[dev->devno], 1);
2589 if (tries[dev->devno] == 1) {
2590 /* This is the last chance, better to slow
2591 * down than lose it.
2593 sata_down_spd_limit(&ap->link);
2594 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2598 if (!tries[dev->devno])
2599 ata_dev_disable(dev);
2605 * ata_port_probe - Mark port as enabled
2606 * @ap: Port for which we indicate enablement
2608 * Modify @ap data structure such that the system
2609 * thinks that the entire port is enabled.
2611 * LOCKING: host lock, or some other form of
2615 void ata_port_probe(struct ata_port *ap)
2617 ap->flags &= ~ATA_FLAG_DISABLED;
2621 * sata_print_link_status - Print SATA link status
2622 * @link: SATA link to printk link status about
2624 * This function prints link speed and status of a SATA link.
2629 void sata_print_link_status(struct ata_link *link)
2631 u32 sstatus, scontrol, tmp;
2633 if (sata_scr_read(link, SCR_STATUS, &sstatus))
2635 sata_scr_read(link, SCR_CONTROL, &scontrol);
2637 if (ata_link_online(link)) {
2638 tmp = (sstatus >> 4) & 0xf;
2639 ata_link_printk(link, KERN_INFO,
2640 "SATA link up %s (SStatus %X SControl %X)\n",
2641 sata_spd_string(tmp), sstatus, scontrol);
2643 ata_link_printk(link, KERN_INFO,
2644 "SATA link down (SStatus %X SControl %X)\n",
2650 * ata_dev_pair - return other device on cable
2653 * Obtain the other device on the same cable, or if none is
2654 * present NULL is returned
2657 struct ata_device *ata_dev_pair(struct ata_device *adev)
2659 struct ata_link *link = adev->link;
2660 struct ata_device *pair = &link->device[1 - adev->devno];
2661 if (!ata_dev_enabled(pair))
2667 * ata_port_disable - Disable port.
2668 * @ap: Port to be disabled.
2670 * Modify @ap data structure such that the system
2671 * thinks that the entire port is disabled, and should
2672 * never attempt to probe or communicate with devices
2675 * LOCKING: host lock, or some other form of
2679 void ata_port_disable(struct ata_port *ap)
2681 ap->link.device[0].class = ATA_DEV_NONE;
2682 ap->link.device[1].class = ATA_DEV_NONE;
2683 ap->flags |= ATA_FLAG_DISABLED;
2687 * sata_down_spd_limit - adjust SATA spd limit downward
2688 * @link: Link to adjust SATA spd limit for
2690 * Adjust SATA spd limit of @link downward. Note that this
2691 * function only adjusts the limit. The change must be applied
2692 * using sata_set_spd().
2695 * Inherited from caller.
2698 * 0 on success, negative errno on failure
2700 int sata_down_spd_limit(struct ata_link *link)
2702 u32 sstatus, spd, mask;
2705 if (!sata_scr_valid(link))
2708 /* If SCR can be read, use it to determine the current SPD.
2709 * If not, use cached value in link->sata_spd.
2711 rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2713 spd = (sstatus >> 4) & 0xf;
2715 spd = link->sata_spd;
2717 mask = link->sata_spd_limit;
2721 /* unconditionally mask off the highest bit */
2722 highbit = fls(mask) - 1;
2723 mask &= ~(1 << highbit);
2725 /* Mask off all speeds higher than or equal to the current
2726 * one. Force 1.5Gbps if current SPD is not available.
2729 mask &= (1 << (spd - 1)) - 1;
2733 /* were we already at the bottom? */
2737 link->sata_spd_limit = mask;
2739 ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2740 sata_spd_string(fls(mask)));
2745 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2747 struct ata_link *host_link = &link->ap->link;
2748 u32 limit, target, spd;
2750 limit = link->sata_spd_limit;
2752 /* Don't configure downstream link faster than upstream link.
2753 * It doesn't speed up anything and some PMPs choke on such
2756 if (!ata_is_host_link(link) && host_link->sata_spd)
2757 limit &= (1 << host_link->sata_spd) - 1;
2759 if (limit == UINT_MAX)
2762 target = fls(limit);
2764 spd = (*scontrol >> 4) & 0xf;
2765 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2767 return spd != target;
2771 * sata_set_spd_needed - is SATA spd configuration needed
2772 * @link: Link in question
2774 * Test whether the spd limit in SControl matches
2775 * @link->sata_spd_limit. This function is used to determine
2776 * whether hardreset is necessary to apply SATA spd
2780 * Inherited from caller.
2783 * 1 if SATA spd configuration is needed, 0 otherwise.
2785 int sata_set_spd_needed(struct ata_link *link)
2789 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2792 return __sata_set_spd_needed(link, &scontrol);
2796 * sata_set_spd - set SATA spd according to spd limit
2797 * @link: Link to set SATA spd for
2799 * Set SATA spd of @link according to sata_spd_limit.
2802 * Inherited from caller.
2805 * 0 if spd doesn't need to be changed, 1 if spd has been
2806 * changed. Negative errno if SCR registers are inaccessible.
2808 int sata_set_spd(struct ata_link *link)
2813 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2816 if (!__sata_set_spd_needed(link, &scontrol))
2819 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2826 * This mode timing computation functionality is ported over from
2827 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
2830 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
2831 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2832 * for UDMA6, which is currently supported only by Maxtor drives.
2834 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
2837 static const struct ata_timing ata_timing[] = {
2838 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
2839 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
2840 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
2841 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
2842 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
2843 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
2844 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
2845 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
2847 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
2848 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
2849 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
2851 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
2852 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
2853 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
2854 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 },
2855 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
2857 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
2858 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
2859 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
2860 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
2861 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
2862 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
2863 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
2864 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
2869 #define ENOUGH(v, unit) (((v)-1)/(unit)+1)
2870 #define EZ(v, unit) ((v)?ENOUGH(v, unit):0)
2872 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
2874 q->setup = EZ(t->setup * 1000, T);
2875 q->act8b = EZ(t->act8b * 1000, T);
2876 q->rec8b = EZ(t->rec8b * 1000, T);
2877 q->cyc8b = EZ(t->cyc8b * 1000, T);
2878 q->active = EZ(t->active * 1000, T);
2879 q->recover = EZ(t->recover * 1000, T);
2880 q->cycle = EZ(t->cycle * 1000, T);
2881 q->udma = EZ(t->udma * 1000, UT);
2884 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
2885 struct ata_timing *m, unsigned int what)
2887 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
2888 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
2889 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
2890 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
2891 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
2892 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
2893 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
2894 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
2897 const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
2899 const struct ata_timing *t = ata_timing;
2901 while (xfer_mode > t->mode)
2904 if (xfer_mode == t->mode)
2909 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
2910 struct ata_timing *t, int T, int UT)
2912 const struct ata_timing *s;
2913 struct ata_timing p;
2919 if (!(s = ata_timing_find_mode(speed)))
2922 memcpy(t, s, sizeof(*s));
2925 * If the drive is an EIDE drive, it can tell us it needs extended
2926 * PIO/MW_DMA cycle timing.
2929 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
2930 memset(&p, 0, sizeof(p));
2931 if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
2932 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
2933 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
2934 } else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
2935 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
2937 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
2941 * Convert the timing to bus clock counts.
2944 ata_timing_quantize(t, t, T, UT);
2947 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2948 * S.M.A.R.T * and some other commands. We have to ensure that the
2949 * DMA cycle timing is slower/equal than the fastest PIO timing.
2952 if (speed > XFER_PIO_6) {
2953 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
2954 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
2958 * Lengthen active & recovery time so that cycle time is correct.
2961 if (t->act8b + t->rec8b < t->cyc8b) {
2962 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
2963 t->rec8b = t->cyc8b - t->act8b;
2966 if (t->active + t->recover < t->cycle) {
2967 t->active += (t->cycle - (t->active + t->recover)) / 2;
2968 t->recover = t->cycle - t->active;
2971 /* In a few cases quantisation may produce enough errors to
2972 leave t->cycle too low for the sum of active and recovery
2973 if so we must correct this */
2974 if (t->active + t->recover > t->cycle)
2975 t->cycle = t->active + t->recover;
2981 * ata_timing_cycle2mode - find xfer mode for the specified cycle duration
2982 * @xfer_shift: ATA_SHIFT_* value for transfer type to examine.
2983 * @cycle: cycle duration in ns
2985 * Return matching xfer mode for @cycle. The returned mode is of
2986 * the transfer type specified by @xfer_shift. If @cycle is too
2987 * slow for @xfer_shift, 0xff is returned. If @cycle is faster
2988 * than the fastest known mode, the fasted mode is returned.
2994 * Matching xfer_mode, 0xff if no match found.
2996 u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
2998 u8 base_mode = 0xff, last_mode = 0xff;
2999 const struct ata_xfer_ent *ent;
3000 const struct ata_timing *t;
3002 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
3003 if (ent->shift == xfer_shift)
3004 base_mode = ent->base;
3006 for (t = ata_timing_find_mode(base_mode);
3007 t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
3008 unsigned short this_cycle;
3010 switch (xfer_shift) {
3012 case ATA_SHIFT_MWDMA:
3013 this_cycle = t->cycle;
3015 case ATA_SHIFT_UDMA:
3016 this_cycle = t->udma;
3022 if (cycle > this_cycle)
3025 last_mode = t->mode;
3032 * ata_down_xfermask_limit - adjust dev xfer masks downward
3033 * @dev: Device to adjust xfer masks
3034 * @sel: ATA_DNXFER_* selector
3036 * Adjust xfer masks of @dev downward. Note that this function
3037 * does not apply the change. Invoking ata_set_mode() afterwards
3038 * will apply the limit.
3041 * Inherited from caller.
3044 * 0 on success, negative errno on failure
3046 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3049 unsigned long orig_mask, xfer_mask;
3050 unsigned long pio_mask, mwdma_mask, udma_mask;
3053 quiet = !!(sel & ATA_DNXFER_QUIET);
3054 sel &= ~ATA_DNXFER_QUIET;
3056 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
3059 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
3062 case ATA_DNXFER_PIO:
3063 highbit = fls(pio_mask) - 1;
3064 pio_mask &= ~(1 << highbit);
3067 case ATA_DNXFER_DMA:
3069 highbit = fls(udma_mask) - 1;
3070 udma_mask &= ~(1 << highbit);
3073 } else if (mwdma_mask) {
3074 highbit = fls(mwdma_mask) - 1;
3075 mwdma_mask &= ~(1 << highbit);
3081 case ATA_DNXFER_40C:
3082 udma_mask &= ATA_UDMA_MASK_40C;
3085 case ATA_DNXFER_FORCE_PIO0:
3087 case ATA_DNXFER_FORCE_PIO:
3096 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
3098 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
3102 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
3103 snprintf(buf, sizeof(buf), "%s:%s",
3104 ata_mode_string(xfer_mask),
3105 ata_mode_string(xfer_mask & ATA_MASK_PIO));
3107 snprintf(buf, sizeof(buf), "%s",
3108 ata_mode_string(xfer_mask));
3110 ata_dev_printk(dev, KERN_WARNING,
3111 "limiting speed to %s\n", buf);
3114 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
3120 static int ata_dev_set_mode(struct ata_device *dev)
3122 struct ata_eh_context *ehc = &dev->link->eh_context;
3123 const char *dev_err_whine = "";
3124 int ign_dev_err = 0;
3125 unsigned int err_mask;
3128 dev->flags &= ~ATA_DFLAG_PIO;
3129 if (dev->xfer_shift == ATA_SHIFT_PIO)
3130 dev->flags |= ATA_DFLAG_PIO;
3132 err_mask = ata_dev_set_xfermode(dev);
3134 if (err_mask & ~AC_ERR_DEV)
3138 ehc->i.flags |= ATA_EHI_POST_SETMODE;
3139 rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3140 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3144 /* Old CFA may refuse this command, which is just fine */
3145 if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
3148 /* Some very old devices and some bad newer ones fail any kind of
3149 SET_XFERMODE request but support PIO0-2 timings and no IORDY */
3150 if (dev->xfer_shift == ATA_SHIFT_PIO && !ata_id_has_iordy(dev->id) &&
3151 dev->pio_mode <= XFER_PIO_2)
3154 /* Early MWDMA devices do DMA but don't allow DMA mode setting.
3155 Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3156 if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3157 dev->dma_mode == XFER_MW_DMA_0 &&
3158 (dev->id[63] >> 8) & 1)
3161 /* if the device is actually configured correctly, ignore dev err */
3162 if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
3165 if (err_mask & AC_ERR_DEV) {
3169 dev_err_whine = " (device error ignored)";
3172 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
3173 dev->xfer_shift, (int)dev->xfer_mode);
3175 ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
3176 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
3182 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
3183 "(err_mask=0x%x)\n", err_mask);
3188 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3189 * @link: link on which timings will be programmed
3190 * @r_failed_dev: out parameter for failed device
3192 * Standard implementation of the function used to tune and set
3193 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3194 * ata_dev_set_mode() fails, pointer to the failing device is
3195 * returned in @r_failed_dev.
3198 * PCI/etc. bus probe sem.
3201 * 0 on success, negative errno otherwise
3204 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3206 struct ata_port *ap = link->ap;
3207 struct ata_device *dev;
3208 int rc = 0, used_dma = 0, found = 0;
3210 /* step 1: calculate xfer_mask */
3211 ata_link_for_each_dev(dev, link) {
3212 unsigned long pio_mask, dma_mask;
3213 unsigned int mode_mask;
3215 if (!ata_dev_enabled(dev))
3218 mode_mask = ATA_DMA_MASK_ATA;
3219 if (dev->class == ATA_DEV_ATAPI)
3220 mode_mask = ATA_DMA_MASK_ATAPI;
3221 else if (ata_id_is_cfa(dev->id))
3222 mode_mask = ATA_DMA_MASK_CFA;
3224 ata_dev_xfermask(dev);
3225 ata_force_xfermask(dev);
3227 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3228 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3230 if (libata_dma_mask & mode_mask)
3231 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3235 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
3236 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3239 if (dev->dma_mode != 0xff)
3245 /* step 2: always set host PIO timings */
3246 ata_link_for_each_dev(dev, link) {
3247 if (!ata_dev_enabled(dev))
3250 if (dev->pio_mode == 0xff) {
3251 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3256 dev->xfer_mode = dev->pio_mode;
3257 dev->xfer_shift = ATA_SHIFT_PIO;
3258 if (ap->ops->set_piomode)
3259 ap->ops->set_piomode(ap, dev);
3262 /* step 3: set host DMA timings */
3263 ata_link_for_each_dev(dev, link) {
3264 if (!ata_dev_enabled(dev) || dev->dma_mode == 0xff)
3267 dev->xfer_mode = dev->dma_mode;
3268 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
3269 if (ap->ops->set_dmamode)
3270 ap->ops->set_dmamode(ap, dev);
3273 /* step 4: update devices' xfer mode */
3274 ata_link_for_each_dev(dev, link) {
3275 /* don't update suspended devices' xfer mode */
3276 if (!ata_dev_enabled(dev))
3279 rc = ata_dev_set_mode(dev);
3284 /* Record simplex status. If we selected DMA then the other
3285 * host channels are not permitted to do so.
3287 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
3288 ap->host->simplex_claimed = ap;
3292 *r_failed_dev = dev;
3297 * ata_wait_ready - wait for link to become ready
3298 * @link: link to be waited on
3299 * @deadline: deadline jiffies for the operation
3300 * @check_ready: callback to check link readiness
3302 * Wait for @link to become ready. @check_ready should return
3303 * positive number if @link is ready, 0 if it isn't, -ENODEV if
3304 * link doesn't seem to be occupied, other errno for other error
3307 * Transient -ENODEV conditions are allowed for
3308 * ATA_TMOUT_FF_WAIT.
3314 * 0 if @linke is ready before @deadline; otherwise, -errno.
3316 int ata_wait_ready(struct ata_link *link, unsigned long deadline,
3317 int (*check_ready)(struct ata_link *link))
3319 unsigned long start = jiffies;
3320 unsigned long nodev_deadline = start + ATA_TMOUT_FF_WAIT;
3323 if (time_after(nodev_deadline, deadline))
3324 nodev_deadline = deadline;
3327 unsigned long now = jiffies;
3330 ready = tmp = check_ready(link);
3334 /* -ENODEV could be transient. Ignore -ENODEV if link
3335 * is online. Also, some SATA devices take a long
3336 * time to clear 0xff after reset. For example,
3337 * HHD424020F7SV00 iVDR needs >= 800ms while Quantum
3338 * GoVault needs even more than that. Wait for
3339 * ATA_TMOUT_FF_WAIT on -ENODEV if link isn't offline.
3341 * Note that some PATA controllers (pata_ali) explode
3342 * if status register is read more than once when
3343 * there's no device attached.
3345 if (ready == -ENODEV) {
3346 if (ata_link_online(link))
3348 else if ((link->ap->flags & ATA_FLAG_SATA) &&
3349 !ata_link_offline(link) &&
3350 time_before(now, nodev_deadline))
3356 if (time_after(now, deadline))
3359 if (!warned && time_after(now, start + 5 * HZ) &&
3360 (deadline - now > 3 * HZ)) {
3361 ata_link_printk(link, KERN_WARNING,
3362 "link is slow to respond, please be patient "
3363 "(ready=%d)\n", tmp);
3372 * ata_wait_after_reset - wait for link to become ready after reset
3373 * @link: link to be waited on
3374 * @deadline: deadline jiffies for the operation
3375 * @check_ready: callback to check link readiness
3377 * Wait for @link to become ready after reset.
3383 * 0 if @linke is ready before @deadline; otherwise, -errno.
3385 extern int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3386 int (*check_ready)(struct ata_link *link))
3388 msleep(ATA_WAIT_AFTER_RESET_MSECS);
3390 return ata_wait_ready(link, deadline, check_ready);
3394 * sata_link_debounce - debounce SATA phy status
3395 * @link: ATA link to debounce SATA phy status for
3396 * @params: timing parameters { interval, duratinon, timeout } in msec
3397 * @deadline: deadline jiffies for the operation
3399 * Make sure SStatus of @link reaches stable state, determined by
3400 * holding the same value where DET is not 1 for @duration polled
3401 * every @interval, before @timeout. Timeout constraints the
3402 * beginning of the stable state. Because DET gets stuck at 1 on
3403 * some controllers after hot unplugging, this functions waits
3404 * until timeout then returns 0 if DET is stable at 1.
3406 * @timeout is further limited by @deadline. The sooner of the
3410 * Kernel thread context (may sleep)
3413 * 0 on success, -errno on failure.
3415 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3416 unsigned long deadline)
3418 unsigned long interval_msec = params[0];
3419 unsigned long duration = msecs_to_jiffies(params[1]);
3420 unsigned long last_jiffies, t;
3424 t = jiffies + msecs_to_jiffies(params[2]);
3425 if (time_before(t, deadline))
3428 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3433 last_jiffies = jiffies;
3436 msleep(interval_msec);
3437 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3443 if (cur == 1 && time_before(jiffies, deadline))
3445 if (time_after(jiffies, last_jiffies + duration))
3450 /* unstable, start over */
3452 last_jiffies = jiffies;
3454 /* Check deadline. If debouncing failed, return
3455 * -EPIPE to tell upper layer to lower link speed.
3457 if (time_after(jiffies, deadline))
3463 * sata_link_resume - resume SATA link
3464 * @link: ATA link to resume SATA
3465 * @params: timing parameters { interval, duratinon, timeout } in msec
3466 * @deadline: deadline jiffies for the operation
3468 * Resume SATA phy @link and debounce it.
3471 * Kernel thread context (may sleep)
3474 * 0 on success, -errno on failure.
3476 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3477 unsigned long deadline)
3479 u32 scontrol, serror;
3482 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3485 scontrol = (scontrol & 0x0f0) | 0x300;
3487 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3490 /* Some PHYs react badly if SStatus is pounded immediately
3491 * after resuming. Delay 200ms before debouncing.
3495 if ((rc = sata_link_debounce(link, params, deadline)))
3498 /* Clear SError. PMP and some host PHYs require this to
3499 * operate and clearing should be done before checking PHY
3500 * online status to avoid race condition (hotplugging between
3501 * link resume and status check).
3503 if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
3504 rc = sata_scr_write(link, SCR_ERROR, serror);
3505 if (rc == 0 || rc == -EINVAL) {
3506 unsigned long flags;
3508 spin_lock_irqsave(link->ap->lock, flags);
3509 link->eh_info.serror = 0;
3510 spin_unlock_irqrestore(link->ap->lock, flags);
3517 * ata_std_prereset - prepare for reset
3518 * @link: ATA link to be reset
3519 * @deadline: deadline jiffies for the operation
3521 * @link is about to be reset. Initialize it. Failure from
3522 * prereset makes libata abort whole reset sequence and give up
3523 * that port, so prereset should be best-effort. It does its
3524 * best to prepare for reset sequence but if things go wrong, it
3525 * should just whine, not fail.
3528 * Kernel thread context (may sleep)
3531 * 0 on success, -errno otherwise.
3533 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3535 struct ata_port *ap = link->ap;
3536 struct ata_eh_context *ehc = &link->eh_context;
3537 const unsigned long *timing = sata_ehc_deb_timing(ehc);
3540 /* if we're about to do hardreset, nothing more to do */
3541 if (ehc->i.action & ATA_EH_HARDRESET)
3544 /* if SATA, resume link */
3545 if (ap->flags & ATA_FLAG_SATA) {
3546 rc = sata_link_resume(link, timing, deadline);
3547 /* whine about phy resume failure but proceed */
3548 if (rc && rc != -EOPNOTSUPP)
3549 ata_link_printk(link, KERN_WARNING, "failed to resume "
3550 "link for reset (errno=%d)\n", rc);
3557 * sata_link_hardreset - reset link via SATA phy reset
3558 * @link: link to reset
3559 * @timing: timing parameters { interval, duratinon, timeout } in msec
3560 * @deadline: deadline jiffies for the operation
3561 * @online: optional out parameter indicating link onlineness
3562 * @check_ready: optional callback to check link readiness
3564 * SATA phy-reset @link using DET bits of SControl register.
3565 * After hardreset, link readiness is waited upon using
3566 * ata_wait_ready() if @check_ready is specified. LLDs are
3567 * allowed to not specify @check_ready and wait itself after this
3568 * function returns. Device classification is LLD's
3571 * *@online is set to one iff reset succeeded and @link is online
3575 * Kernel thread context (may sleep)
3578 * 0 on success, -errno otherwise.
3580 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3581 unsigned long deadline,
3582 bool *online, int (*check_ready)(struct ata_link *))
3592 if (sata_set_spd_needed(link)) {
3593 /* SATA spec says nothing about how to reconfigure
3594 * spd. To be on the safe side, turn off phy during
3595 * reconfiguration. This works for at least ICH7 AHCI
3598 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3601 scontrol = (scontrol & 0x0f0) | 0x304;
3603 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3609 /* issue phy wake/reset */
3610 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3613 scontrol = (scontrol & 0x0f0) | 0x301;
3615 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3618 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3619 * 10.4.2 says at least 1 ms.
3623 /* bring link back */
3624 rc = sata_link_resume(link, timing, deadline);
3627 /* if link is offline nothing more to do */
3628 if (ata_link_offline(link))
3631 /* Link is online. From this point, -ENODEV too is an error. */
3635 if ((link->ap->flags & ATA_FLAG_PMP) && ata_is_host_link(link)) {
3636 /* If PMP is supported, we have to do follow-up SRST.
3637 * Some PMPs don't send D2H Reg FIS after hardreset if
3638 * the first port is empty. Wait only for
3639 * ATA_TMOUT_PMP_SRST_WAIT.
3642 unsigned long pmp_deadline;
3644 pmp_deadline = jiffies + ATA_TMOUT_PMP_SRST_WAIT;
3645 if (time_after(pmp_deadline, deadline))
3646 pmp_deadline = deadline;
3647 ata_wait_ready(link, pmp_deadline, check_ready);
3655 rc = ata_wait_ready(link, deadline, check_ready);
3657 if (rc && rc != -EAGAIN)
3658 ata_link_printk(link, KERN_ERR,
3659 "COMRESET failed (errno=%d)\n", rc);
3660 DPRINTK("EXIT, rc=%d\n", rc);
3665 * sata_std_hardreset - COMRESET w/o waiting or classification
3666 * @link: link to reset
3667 * @class: resulting class of attached device
3668 * @deadline: deadline jiffies for the operation
3670 * Standard SATA COMRESET w/o waiting or classification.
3673 * Kernel thread context (may sleep)
3676 * 0 if link offline, -EAGAIN if link online, -errno on errors.
3678 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3679 unsigned long deadline)
3681 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3686 rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
3687 return online ? -EAGAIN : rc;
3691 * ata_std_postreset - standard postreset callback
3692 * @link: the target ata_link
3693 * @classes: classes of attached devices
3695 * This function is invoked after a successful reset. Note that
3696 * the device might have been reset more than once using
3697 * different reset methods before postreset is invoked.
3700 * Kernel thread context (may sleep)
3702 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3706 /* print link status */
3707 sata_print_link_status(link);
3713 * ata_dev_same_device - Determine whether new ID matches configured device
3714 * @dev: device to compare against
3715 * @new_class: class of the new device
3716 * @new_id: IDENTIFY page of the new device
3718 * Compare @new_class and @new_id against @dev and determine
3719 * whether @dev is the device indicated by @new_class and
3726 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
3728 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
3731 const u16 *old_id = dev->id;
3732 unsigned char model[2][ATA_ID_PROD_LEN + 1];
3733 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3735 if (dev->class != new_class) {
3736 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
3737 dev->class, new_class);
3741 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
3742 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
3743 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
3744 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3746 if (strcmp(model[0], model[1])) {
3747 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
3748 "'%s' != '%s'\n", model[0], model[1]);
3752 if (strcmp(serial[0], serial[1])) {
3753 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
3754 "'%s' != '%s'\n", serial[0], serial[1]);
3762 * ata_dev_reread_id - Re-read IDENTIFY data
3763 * @dev: target ATA device
3764 * @readid_flags: read ID flags
3766 * Re-read IDENTIFY page and make sure @dev is still attached to
3770 * Kernel thread context (may sleep)
3773 * 0 on success, negative errno otherwise
3775 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3777 unsigned int class = dev->class;
3778 u16 *id = (void *)dev->link->ap->sector_buf;
3782 rc = ata_dev_read_id(dev, &class, readid_flags, id);
3786 /* is the device still there? */
3787 if (!ata_dev_same_device(dev, class, id))
3790 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3795 * ata_dev_revalidate - Revalidate ATA device
3796 * @dev: device to revalidate
3797 * @new_class: new class code
3798 * @readid_flags: read ID flags
3800 * Re-read IDENTIFY page, make sure @dev is still attached to the
3801 * port and reconfigure it according to the new IDENTIFY page.
3804 * Kernel thread context (may sleep)
3807 * 0 on success, negative errno otherwise
3809 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
3810 unsigned int readid_flags)
3812 u64 n_sectors = dev->n_sectors;
3815 if (!ata_dev_enabled(dev))
3818 /* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
3819 if (ata_class_enabled(new_class) &&
3820 new_class != ATA_DEV_ATA && new_class != ATA_DEV_ATAPI) {
3821 ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
3822 dev->class, new_class);
3828 rc = ata_dev_reread_id(dev, readid_flags);
3832 /* configure device according to the new ID */
3833 rc = ata_dev_configure(dev);
3837 /* verify n_sectors hasn't changed */
3838 if (dev->class == ATA_DEV_ATA && n_sectors &&
3839 dev->n_sectors != n_sectors) {
3840 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
3842 (unsigned long long)n_sectors,
3843 (unsigned long long)dev->n_sectors);
3845 /* restore original n_sectors */
3846 dev->n_sectors = n_sectors;
3855 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3859 struct ata_blacklist_entry {
3860 const char *model_num;
3861 const char *model_rev;
3862 unsigned long horkage;
3865 static const struct ata_blacklist_entry ata_device_blacklist [] = {
3866 /* Devices with DMA related problems under Linux */
3867 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
3868 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
3869 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
3870 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
3871 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
3872 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
3873 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
3874 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
3875 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
3876 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
3877 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
3878 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
3879 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
3880 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
3881 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
3882 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
3883 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
3884 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
3885 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
3886 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
3887 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
3888 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
3889 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
3890 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
3891 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
3892 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
3893 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
3894 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
3895 { "SAMSUNG CD-ROM SN-124", "N001", ATA_HORKAGE_NODMA },
3896 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA },
3897 /* Odd clown on sil3726/4726 PMPs */
3898 { "Config Disk", NULL, ATA_HORKAGE_NODMA |
3899 ATA_HORKAGE_SKIP_PM },
3901 /* Weird ATAPI devices */
3902 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
3904 /* Devices we expect to fail diagnostics */
3906 /* Devices where NCQ should be avoided */
3908 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
3909 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, },
3910 /* http://thread.gmane.org/gmane.linux.ide/14907 */
3911 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ },
3913 { "Maxtor *", "BANC*", ATA_HORKAGE_NONCQ },
3914 { "Maxtor 7V300F0", "VA111630", ATA_HORKAGE_NONCQ },
3915 { "ST380817AS", "3.42", ATA_HORKAGE_NONCQ },
3916 { "ST3160023AS", "3.42", ATA_HORKAGE_NONCQ },
3918 /* Blacklist entries taken from Silicon Image 3124/3132
3919 Windows driver .inf file - also several Linux problem reports */
3920 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, },
3921 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, },
3922 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, },
3924 /* devices which puke on READ_NATIVE_MAX */
3925 { "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, },
3926 { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
3927 { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
3928 { "MAXTOR 6L080L4", "A93.0500", ATA_HORKAGE_BROKEN_HPA },
3930 /* Devices which report 1 sector over size HPA */
3931 { "ST340823A", NULL, ATA_HORKAGE_HPA_SIZE, },
3932 { "ST320413A", NULL, ATA_HORKAGE_HPA_SIZE, },
3933 { "ST310211A", NULL, ATA_HORKAGE_HPA_SIZE, },
3935 /* Devices which get the IVB wrong */
3936 { "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
3937 { "TSSTcorp CDDVDW SH-S202J", "SB00", ATA_HORKAGE_IVB, },
3938 { "TSSTcorp CDDVDW SH-S202J", "SB01", ATA_HORKAGE_IVB, },
3939 { "TSSTcorp CDDVDW SH-S202N", "SB00", ATA_HORKAGE_IVB, },
3940 { "TSSTcorp CDDVDW SH-S202N", "SB01", ATA_HORKAGE_IVB, },
3946 static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
3952 * check for trailing wildcard: *\0
3954 p = strchr(patt, wildchar);
3955 if (p && ((*(p + 1)) == 0))
3966 return strncmp(patt, name, len);
3969 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
3971 unsigned char model_num[ATA_ID_PROD_LEN + 1];
3972 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3973 const struct ata_blacklist_entry *ad = ata_device_blacklist;
3975 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
3976 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
3978 while (ad->model_num) {
3979 if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
3980 if (ad->model_rev == NULL)
3982 if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
3990 static int ata_dma_blacklisted(const struct ata_device *dev)
3992 /* We don't support polling DMA.
3993 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
3994 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
3996 if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
3997 (dev->flags & ATA_DFLAG_CDB_INTR))
3999 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4003 * ata_is_40wire - check drive side detection
4006 * Perform drive side detection decoding, allowing for device vendors
4007 * who can't follow the documentation.
4010 static int ata_is_40wire(struct ata_device *dev)
4012 if (dev->horkage & ATA_HORKAGE_IVB)
4013 return ata_drive_40wire_relaxed(dev->id);
4014 return ata_drive_40wire(dev->id);
4018 * cable_is_40wire - 40/80/SATA decider
4019 * @ap: port to consider
4021 * This function encapsulates the policy for speed management
4022 * in one place. At the moment we don't cache the result but
4023 * there is a good case for setting ap->cbl to the result when
4024 * we are called with unknown cables (and figuring out if it
4025 * impacts hotplug at all).
4027 * Return 1 if the cable appears to be 40 wire.
4030 static int cable_is_40wire(struct ata_port *ap)
4032 struct ata_link *link;
4033 struct ata_device *dev;
4035 /* If the controller thinks we are 40 wire, we are */
4036 if (ap->cbl == ATA_CBL_PATA40)
4038 /* If the controller thinks we are 80 wire, we are */
4039 if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
4041 /* If the controller doesn't know we scan
4043 - Note: We look for all 40 wire detects at this point.
4044 Any 80 wire detect is taken to be 80 wire cable
4046 - In many setups only the one drive (slave if present)
4047 will give a valid detect
4048 - If you have a non detect capable drive you don't
4049 want it to colour the choice
4051 ata_port_for_each_link(link, ap) {
4052 ata_link_for_each_dev(dev, link) {
4053 if (!ata_is_40wire(dev))
4061 * ata_dev_xfermask - Compute supported xfermask of the given device
4062 * @dev: Device to compute xfermask for
4064 * Compute supported xfermask of @dev and store it in
4065 * dev->*_mask. This function is responsible for applying all
4066 * known limits including host controller limits, device
4072 static void ata_dev_xfermask(struct ata_device *dev)
4074 struct ata_link *link = dev->link;
4075 struct ata_port *ap = link->ap;
4076 struct ata_host *host = ap->host;
4077 unsigned long xfer_mask;
4079 /* controller modes available */
4080 xfer_mask = ata_pack_xfermask(ap->pio_mask,
4081 ap->mwdma_mask, ap->udma_mask);
4083 /* drive modes available */
4084 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
4085 dev->mwdma_mask, dev->udma_mask);
4086 xfer_mask &= ata_id_xfermask(dev->id);
4089 * CFA Advanced TrueIDE timings are not allowed on a shared
4092 if (ata_dev_pair(dev)) {
4093 /* No PIO5 or PIO6 */
4094 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
4095 /* No MWDMA3 or MWDMA 4 */
4096 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
4099 if (ata_dma_blacklisted(dev)) {
4100 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4101 ata_dev_printk(dev, KERN_WARNING,
4102 "device is on DMA blacklist, disabling DMA\n");
4105 if ((host->flags & ATA_HOST_SIMPLEX) &&
4106 host->simplex_claimed && host->simplex_claimed != ap) {
4107 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4108 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
4109 "other device, disabling DMA\n");
4112 if (ap->flags & ATA_FLAG_NO_IORDY)
4113 xfer_mask &= ata_pio_mask_no_iordy(dev);
4115 if (ap->ops->mode_filter)
4116 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4118 /* Apply cable rule here. Don't apply it early because when
4119 * we handle hot plug the cable type can itself change.
4120 * Check this last so that we know if the transfer rate was
4121 * solely limited by the cable.
4122 * Unknown or 80 wire cables reported host side are checked
4123 * drive side as well. Cases where we know a 40wire cable
4124 * is used safely for 80 are not checked here.
4126 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
4127 /* UDMA/44 or higher would be available */
4128 if (cable_is_40wire(ap)) {
4129 ata_dev_printk(dev, KERN_WARNING,
4130 "limited to UDMA/33 due to 40-wire cable\n");
4131 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
4134 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
4135 &dev->mwdma_mask, &dev->udma_mask);
4139 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
4140 * @dev: Device to which command will be sent
4142 * Issue SET FEATURES - XFER MODE command to device @dev
4146 * PCI/etc. bus probe sem.
4149 * 0 on success, AC_ERR_* mask otherwise.
4152 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
4154 struct ata_taskfile tf;
4155 unsigned int err_mask;
4157 /* set up set-features taskfile */
4158 DPRINTK("set features - xfer mode\n");
4160 /* Some controllers and ATAPI devices show flaky interrupt
4161 * behavior after setting xfer mode. Use polling instead.
4163 ata_tf_init(dev, &tf);
4164 tf.command = ATA_CMD_SET_FEATURES;
4165 tf.feature = SETFEATURES_XFER;
4166 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4167 tf.protocol = ATA_PROT_NODATA;
4168 /* If we are using IORDY we must send the mode setting command */
4169 if (ata_pio_need_iordy(dev))
4170 tf.nsect = dev->xfer_mode;
4171 /* If the device has IORDY and the controller does not - turn it off */
4172 else if (ata_id_has_iordy(dev->id))
4174 else /* In the ancient relic department - skip all of this */
4177 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4179 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4183 * ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4184 * @dev: Device to which command will be sent
4185 * @enable: Whether to enable or disable the feature
4186 * @feature: The sector count represents the feature to set
4188 * Issue SET FEATURES - SATA FEATURES command to device @dev
4189 * on port @ap with sector count
4192 * PCI/etc. bus probe sem.
4195 * 0 on success, AC_ERR_* mask otherwise.
4197 static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
4200 struct ata_taskfile tf;
4201 unsigned int err_mask;
4203 /* set up set-features taskfile */
4204 DPRINTK("set features - SATA features\n");
4206 ata_tf_init(dev, &tf);
4207 tf.command = ATA_CMD_SET_FEATURES;
4208 tf.feature = enable;
4209 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4210 tf.protocol = ATA_PROT_NODATA;
4213 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4215 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4220 * ata_dev_init_params - Issue INIT DEV PARAMS command
4221 * @dev: Device to which command will be sent
4222 * @heads: Number of heads (taskfile parameter)
4223 * @sectors: Number of sectors (taskfile parameter)
4226 * Kernel thread context (may sleep)
4229 * 0 on success, AC_ERR_* mask otherwise.
4231 static unsigned int ata_dev_init_params(struct ata_device *dev,
4232 u16 heads, u16 sectors)
4234 struct ata_taskfile tf;
4235 unsigned int err_mask;
4237 /* Number of sectors per track 1-255. Number of heads 1-16 */
4238 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4239 return AC_ERR_INVALID;
4241 /* set up init dev params taskfile */
4242 DPRINTK("init dev params \n");
4244 ata_tf_init(dev, &tf);
4245 tf.command = ATA_CMD_INIT_DEV_PARAMS;
4246 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4247 tf.protocol = ATA_PROT_NODATA;
4249 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4251 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4252 /* A clean abort indicates an original or just out of spec drive
4253 and we should continue as we issue the setup based on the
4254 drive reported working geometry */
4255 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4258 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4263 * ata_sg_clean - Unmap DMA memory associated with command
4264 * @qc: Command containing DMA memory to be released
4266 * Unmap all mapped DMA memory associated with this command.
4269 * spin_lock_irqsave(host lock)
4271 void ata_sg_clean(struct ata_queued_cmd *qc)
4273 struct ata_port *ap = qc->ap;
4274 struct scatterlist *sg = qc->sg;
4275 int dir = qc->dma_dir;
4277 WARN_ON(sg == NULL);
4279 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
4282 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4284 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4289 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
4290 * @qc: Metadata associated with taskfile to check
4292 * Allow low-level driver to filter ATA PACKET commands, returning
4293 * a status indicating whether or not it is OK to use DMA for the
4294 * supplied PACKET command.
4297 * spin_lock_irqsave(host lock)
4299 * RETURNS: 0 when ATAPI DMA can be used
4302 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
4304 struct ata_port *ap = qc->ap;
4306 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a
4307 * few ATAPI devices choke on such DMA requests.
4309 if (unlikely(qc->nbytes & 15))
4312 if (ap->ops->check_atapi_dma)
4313 return ap->ops->check_atapi_dma(qc);
4319 * ata_std_qc_defer - Check whether a qc needs to be deferred
4320 * @qc: ATA command in question
4322 * Non-NCQ commands cannot run with any other command, NCQ or
4323 * not. As upper layer only knows the queue depth, we are
4324 * responsible for maintaining exclusion. This function checks
4325 * whether a new command @qc can be issued.
4328 * spin_lock_irqsave(host lock)
4331 * ATA_DEFER_* if deferring is needed, 0 otherwise.
4333 int ata_std_qc_defer(struct ata_queued_cmd *qc)
4335 struct ata_link *link = qc->dev->link;
4337 if (qc->tf.protocol == ATA_PROT_NCQ) {
4338 if (!ata_tag_valid(link->active_tag))
4341 if (!ata_tag_valid(link->active_tag) && !link->sactive)
4345 return ATA_DEFER_LINK;
4348 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4351 * ata_sg_init - Associate command with scatter-gather table.
4352 * @qc: Command to be associated
4353 * @sg: Scatter-gather table.
4354 * @n_elem: Number of elements in s/g table.
4356 * Initialize the data-related elements of queued_cmd @qc
4357 * to point to a scatter-gather table @sg, containing @n_elem
4361 * spin_lock_irqsave(host lock)
4363 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4364 unsigned int n_elem)
4367 qc->n_elem = n_elem;
4372 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
4373 * @qc: Command with scatter-gather table to be mapped.
4375 * DMA-map the scatter-gather table associated with queued_cmd @qc.
4378 * spin_lock_irqsave(host lock)
4381 * Zero on success, negative on error.
4384 static int ata_sg_setup(struct ata_queued_cmd *qc)
4386 struct ata_port *ap = qc->ap;
4387 unsigned int n_elem;
4389 VPRINTK("ENTER, ata%u\n", ap->print_id);
4391 n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
4395 DPRINTK("%d sg elements mapped\n", n_elem);
4397 qc->n_elem = n_elem;
4398 qc->flags |= ATA_QCFLAG_DMAMAP;
4404 * swap_buf_le16 - swap halves of 16-bit words in place
4405 * @buf: Buffer to swap
4406 * @buf_words: Number of 16-bit words in buffer.
4408 * Swap halves of 16-bit words if needed to convert from
4409 * little-endian byte order to native cpu byte order, or
4413 * Inherited from caller.
4415 void swap_buf_le16(u16 *buf, unsigned int buf_words)
4420 for (i = 0; i < buf_words; i++)
4421 buf[i] = le16_to_cpu(buf[i]);
4422 #endif /* __BIG_ENDIAN */
4426 * ata_qc_new - Request an available ATA command, for queueing
4427 * @ap: Port associated with device @dev
4428 * @dev: Device from whom we request an available command structure
4434 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4436 struct ata_queued_cmd *qc = NULL;
4439 /* no command while frozen */
4440 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4443 /* the last tag is reserved for internal command. */
4444 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4445 if (!test_and_set_bit(i, &ap->qc_allocated)) {
4446 qc = __ata_qc_from_tag(ap, i);
4457 * ata_qc_new_init - Request an available ATA command, and initialize it
4458 * @dev: Device from whom we request an available command structure
4464 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
4466 struct ata_port *ap = dev->link->ap;
4467 struct ata_queued_cmd *qc;
4469 qc = ata_qc_new(ap);
4482 * ata_qc_free - free unused ata_queued_cmd
4483 * @qc: Command to complete
4485 * Designed to free unused ata_queued_cmd object
4486 * in case something prevents using it.
4489 * spin_lock_irqsave(host lock)
4491 void ata_qc_free(struct ata_queued_cmd *qc)
4493 struct ata_port *ap = qc->ap;
4496 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4500 if (likely(ata_tag_valid(tag))) {
4501 qc->tag = ATA_TAG_POISON;
4502 clear_bit(tag, &ap->qc_allocated);
4506 void __ata_qc_complete(struct ata_queued_cmd *qc)
4508 struct ata_port *ap = qc->ap;
4509 struct ata_link *link = qc->dev->link;
4511 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4512 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4514 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4517 /* command should be marked inactive atomically with qc completion */
4518 if (qc->tf.protocol == ATA_PROT_NCQ) {
4519 link->sactive &= ~(1 << qc->tag);
4521 ap->nr_active_links--;
4523 link->active_tag = ATA_TAG_POISON;
4524 ap->nr_active_links--;
4527 /* clear exclusive status */
4528 if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
4529 ap->excl_link == link))
4530 ap->excl_link = NULL;
4532 /* atapi: mark qc as inactive to prevent the interrupt handler
4533 * from completing the command twice later, before the error handler
4534 * is called. (when rc != 0 and atapi request sense is needed)
4536 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4537 ap->qc_active &= ~(1 << qc->tag);
4539 /* call completion callback */
4540 qc->complete_fn(qc);
4543 static void fill_result_tf(struct ata_queued_cmd *qc)
4545 struct ata_port *ap = qc->ap;
4547 qc->result_tf.flags = qc->tf.flags;
4548 ap->ops->qc_fill_rtf(qc);
4551 static void ata_verify_xfer(struct ata_queued_cmd *qc)
4553 struct ata_device *dev = qc->dev;
4555 if (ata_tag_internal(qc->tag))
4558 if (ata_is_nodata(qc->tf.protocol))
4561 if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
4564 dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
4568 * ata_qc_complete - Complete an active ATA command
4569 * @qc: Command to complete
4570 * @err_mask: ATA Status register contents
4572 * Indicate to the mid and upper layers that an ATA
4573 * command has completed, with either an ok or not-ok status.
4576 * spin_lock_irqsave(host lock)
4578 void ata_qc_complete(struct ata_queued_cmd *qc)
4580 struct ata_port *ap = qc->ap;
4582 /* XXX: New EH and old EH use different mechanisms to
4583 * synchronize EH with regular execution path.
4585 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4586 * Normal execution path is responsible for not accessing a
4587 * failed qc. libata core enforces the rule by returning NULL
4588 * from ata_qc_from_tag() for failed qcs.
4590 * Old EH depends on ata_qc_complete() nullifying completion
4591 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4592 * not synchronize with interrupt handler. Only PIO task is
4595 if (ap->ops->error_handler) {
4596 struct ata_device *dev = qc->dev;
4597 struct ata_eh_info *ehi = &dev->link->eh_info;
4599 WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4601 if (unlikely(qc->err_mask))
4602 qc->flags |= ATA_QCFLAG_FAILED;
4604 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
4605 if (!ata_tag_internal(qc->tag)) {
4606 /* always fill result TF for failed qc */
4608 ata_qc_schedule_eh(qc);
4613 /* read result TF if requested */
4614 if (qc->flags & ATA_QCFLAG_RESULT_TF)
4617 /* Some commands need post-processing after successful
4620 switch (qc->tf.command) {
4621 case ATA_CMD_SET_FEATURES:
4622 if (qc->tf.feature != SETFEATURES_WC_ON &&
4623 qc->tf.feature != SETFEATURES_WC_OFF)
4626 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
4627 case ATA_CMD_SET_MULTI: /* multi_count changed */
4628 /* revalidate device */
4629 ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
4630 ata_port_schedule_eh(ap);
4634 dev->flags |= ATA_DFLAG_SLEEPING;
4638 if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
4639 ata_verify_xfer(qc);
4641 __ata_qc_complete(qc);
4643 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
4646 /* read result TF if failed or requested */
4647 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
4650 __ata_qc_complete(qc);
4655 * ata_qc_complete_multiple - Complete multiple qcs successfully
4656 * @ap: port in question
4657 * @qc_active: new qc_active mask
4659 * Complete in-flight commands. This functions is meant to be
4660 * called from low-level driver's interrupt routine to complete
4661 * requests normally. ap->qc_active and @qc_active is compared
4662 * and commands are completed accordingly.
4665 * spin_lock_irqsave(host lock)
4668 * Number of completed commands on success, -errno otherwise.
4670 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
4676 done_mask = ap->qc_active ^ qc_active;
4678 if (unlikely(done_mask & qc_active)) {
4679 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
4680 "(%08x->%08x)\n", ap->qc_active, qc_active);
4684 for (i = 0; i < ATA_MAX_QUEUE; i++) {
4685 struct ata_queued_cmd *qc;
4687 if (!(done_mask & (1 << i)))
4690 if ((qc = ata_qc_from_tag(ap, i))) {
4691 ata_qc_complete(qc);
4700 * ata_qc_issue - issue taskfile to device
4701 * @qc: command to issue to device
4703 * Prepare an ATA command to submission to device.
4704 * This includes mapping the data into a DMA-able
4705 * area, filling in the S/G table, and finally
4706 * writing the taskfile to hardware, starting the command.
4709 * spin_lock_irqsave(host lock)
4711 void ata_qc_issue(struct ata_queued_cmd *qc)
4713 struct ata_port *ap = qc->ap;
4714 struct ata_link *link = qc->dev->link;
4715 u8 prot = qc->tf.protocol;
4717 /* Make sure only one non-NCQ command is outstanding. The
4718 * check is skipped for old EH because it reuses active qc to
4719 * request ATAPI sense.
4721 WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
4723 if (ata_is_ncq(prot)) {
4724 WARN_ON(link->sactive & (1 << qc->tag));
4727 ap->nr_active_links++;
4728 link->sactive |= 1 << qc->tag;
4730 WARN_ON(link->sactive);
4732 ap->nr_active_links++;
4733 link->active_tag = qc->tag;
4736 qc->flags |= ATA_QCFLAG_ACTIVE;
4737 ap->qc_active |= 1 << qc->tag;
4739 /* We guarantee to LLDs that they will have at least one
4740 * non-zero sg if the command is a data command.
4742 BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
4744 if (ata_is_dma(prot) || (ata_is_pio(prot) &&
4745 (ap->flags & ATA_FLAG_PIO_DMA)))
4746 if (ata_sg_setup(qc))
4749 /* if device is sleeping, schedule reset and abort the link */
4750 if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
4751 link->eh_info.action |= ATA_EH_RESET;
4752 ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
4753 ata_link_abort(link);
4757 ap->ops->qc_prep(qc);
4759 qc->err_mask |= ap->ops->qc_issue(qc);
4760 if (unlikely(qc->err_mask))
4765 qc->err_mask |= AC_ERR_SYSTEM;
4767 ata_qc_complete(qc);
4771 * sata_scr_valid - test whether SCRs are accessible
4772 * @link: ATA link to test SCR accessibility for
4774 * Test whether SCRs are accessible for @link.
4780 * 1 if SCRs are accessible, 0 otherwise.
4782 int sata_scr_valid(struct ata_link *link)
4784 struct ata_port *ap = link->ap;
4786 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
4790 * sata_scr_read - read SCR register of the specified port
4791 * @link: ATA link to read SCR for
4793 * @val: Place to store read value
4795 * Read SCR register @reg of @link into *@val. This function is
4796 * guaranteed to succeed if @link is ap->link, the cable type of
4797 * the port is SATA and the port implements ->scr_read.
4800 * None if @link is ap->link. Kernel thread context otherwise.
4803 * 0 on success, negative errno on failure.
4805 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
4807 if (ata_is_host_link(link)) {
4808 struct ata_port *ap = link->ap;
4810 if (sata_scr_valid(link))
4811 return ap->ops->scr_read(ap, reg, val);
4815 return sata_pmp_scr_read(link, reg, val);
4819 * sata_scr_write - write SCR register of the specified port
4820 * @link: ATA link to write SCR for
4821 * @reg: SCR to write
4822 * @val: value to write
4824 * Write @val to SCR register @reg of @link. This function is
4825 * guaranteed to succeed if @link is ap->link, the cable type of
4826 * the port is SATA and the port implements ->scr_read.
4829 * None if @link is ap->link. Kernel thread context otherwise.
4832 * 0 on success, negative errno on failure.
4834 int sata_scr_write(struct ata_link *link, int reg, u32 val)
4836 if (ata_is_host_link(link)) {
4837 struct ata_port *ap = link->ap;
4839 if (sata_scr_valid(link))
4840 return ap->ops->scr_write(ap, reg, val);
4844 return sata_pmp_scr_write(link, reg, val);
4848 * sata_scr_write_flush - write SCR register of the specified port and flush
4849 * @link: ATA link to write SCR for
4850 * @reg: SCR to write
4851 * @val: value to write
4853 * This function is identical to sata_scr_write() except that this
4854 * function performs flush after writing to the register.
4857 * None if @link is ap->link. Kernel thread context otherwise.
4860 * 0 on success, negative errno on failure.
4862 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
4864 if (ata_is_host_link(link)) {
4865 struct ata_port *ap = link->ap;
4868 if (sata_scr_valid(link)) {
4869 rc = ap->ops->scr_write(ap, reg, val);
4871 rc = ap->ops->scr_read(ap, reg, &val);
4877 return sata_pmp_scr_write(link, reg, val);
4881 * ata_link_online - test whether the given link is online
4882 * @link: ATA link to test
4884 * Test whether @link is online. Note that this function returns
4885 * 0 if online status of @link cannot be obtained, so
4886 * ata_link_online(link) != !ata_link_offline(link).
4892 * 1 if the port online status is available and online.
4894 int ata_link_online(struct ata_link *link)
4898 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
4899 (sstatus & 0xf) == 0x3)
4905 * ata_link_offline - test whether the given link is offline
4906 * @link: ATA link to test
4908 * Test whether @link is offline. Note that this function
4909 * returns 0 if offline status of @link cannot be obtained, so
4910 * ata_link_online(link) != !ata_link_offline(link).
4916 * 1 if the port offline status is available and offline.
4918 int ata_link_offline(struct ata_link *link)
4922 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
4923 (sstatus & 0xf) != 0x3)
4929 static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
4930 unsigned int action, unsigned int ehi_flags,
4933 unsigned long flags;
4936 for (i = 0; i < host->n_ports; i++) {
4937 struct ata_port *ap = host->ports[i];
4938 struct ata_link *link;
4940 /* Previous resume operation might still be in
4941 * progress. Wait for PM_PENDING to clear.
4943 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
4944 ata_port_wait_eh(ap);
4945 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
4948 /* request PM ops to EH */
4949 spin_lock_irqsave(ap->lock, flags);
4954 ap->pm_result = &rc;
4957 ap->pflags |= ATA_PFLAG_PM_PENDING;
4958 __ata_port_for_each_link(link, ap) {
4959 link->eh_info.action |= action;
4960 link->eh_info.flags |= ehi_flags;
4963 ata_port_schedule_eh(ap);
4965 spin_unlock_irqrestore(ap->lock, flags);
4967 /* wait and check result */
4969 ata_port_wait_eh(ap);
4970 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
4980 * ata_host_suspend - suspend host
4981 * @host: host to suspend
4984 * Suspend @host. Actual operation is performed by EH. This
4985 * function requests EH to perform PM operations and waits for EH
4989 * Kernel thread context (may sleep).
4992 * 0 on success, -errno on failure.
4994 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
4999 * disable link pm on all ports before requesting
5002 ata_lpm_enable(host);
5004 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5006 host->dev->power.power_state = mesg;
5011 * ata_host_resume - resume host
5012 * @host: host to resume
5014 * Resume @host. Actual operation is performed by EH. This
5015 * function requests EH to perform PM operations and returns.
5016 * Note that all resume operations are performed parallely.
5019 * Kernel thread context (may sleep).
5021 void ata_host_resume(struct ata_host *host)
5023 ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
5024 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5025 host->dev->power.power_state = PMSG_ON;
5027 /* reenable link pm */
5028 ata_lpm_disable(host);
5033 * ata_port_start - Set port up for dma.
5034 * @ap: Port to initialize
5036 * Called just after data structures for each port are
5037 * initialized. Allocates space for PRD table.
5039 * May be used as the port_start() entry in ata_port_operations.
5042 * Inherited from caller.
5044 int ata_port_start(struct ata_port *ap)
5046 struct device *dev = ap->dev;
5048 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
5057 * ata_dev_init - Initialize an ata_device structure
5058 * @dev: Device structure to initialize
5060 * Initialize @dev in preparation for probing.
5063 * Inherited from caller.
5065 void ata_dev_init(struct ata_device *dev)
5067 struct ata_link *link = dev->link;
5068 struct ata_port *ap = link->ap;
5069 unsigned long flags;
5071 /* SATA spd limit is bound to the first device */
5072 link->sata_spd_limit = link->hw_sata_spd_limit;
5075 /* High bits of dev->flags are used to record warm plug
5076 * requests which occur asynchronously. Synchronize using
5079 spin_lock_irqsave(ap->lock, flags);
5080 dev->flags &= ~ATA_DFLAG_INIT_MASK;
5082 spin_unlock_irqrestore(ap->lock, flags);
5084 memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
5085 sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5086 dev->pio_mask = UINT_MAX;
5087 dev->mwdma_mask = UINT_MAX;
5088 dev->udma_mask = UINT_MAX;
5092 * ata_link_init - Initialize an ata_link structure
5093 * @ap: ATA port link is attached to
5094 * @link: Link structure to initialize
5095 * @pmp: Port multiplier port number
5100 * Kernel thread context (may sleep)
5102 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5106 /* clear everything except for devices */
5107 memset(link, 0, offsetof(struct ata_link, device[0]));
5111 link->active_tag = ATA_TAG_POISON;
5112 link->hw_sata_spd_limit = UINT_MAX;
5114 /* can't use iterator, ap isn't initialized yet */
5115 for (i = 0; i < ATA_MAX_DEVICES; i++) {
5116 struct ata_device *dev = &link->device[i];
5119 dev->devno = dev - link->device;
5125 * sata_link_init_spd - Initialize link->sata_spd_limit
5126 * @link: Link to configure sata_spd_limit for
5128 * Initialize @link->[hw_]sata_spd_limit to the currently
5132 * Kernel thread context (may sleep).
5135 * 0 on success, -errno on failure.
5137 int sata_link_init_spd(struct ata_link *link)
5143 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
5147 spd = (scontrol >> 4) & 0xf;
5149 link->hw_sata_spd_limit &= (1 << spd) - 1;
5151 ata_force_spd_limit(link);
5153 link->sata_spd_limit = link->hw_sata_spd_limit;
5159 * ata_port_alloc - allocate and initialize basic ATA port resources
5160 * @host: ATA host this allocated port belongs to
5162 * Allocate and initialize basic ATA port resources.
5165 * Allocate ATA port on success, NULL on failure.
5168 * Inherited from calling layer (may sleep).
5170 struct ata_port *ata_port_alloc(struct ata_host *host)
5172 struct ata_port *ap;
5176 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
5180 ap->pflags |= ATA_PFLAG_INITIALIZING;
5181 ap->lock = &host->lock;
5182 ap->flags = ATA_FLAG_DISABLED;
5184 ap->ctl = ATA_DEVCTL_OBS;
5186 ap->dev = host->dev;
5187 ap->last_ctl = 0xFF;
5189 #if defined(ATA_VERBOSE_DEBUG)
5190 /* turn on all debugging levels */
5191 ap->msg_enable = 0x00FF;
5192 #elif defined(ATA_DEBUG)
5193 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
5195 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5198 INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
5199 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
5200 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5201 INIT_LIST_HEAD(&ap->eh_done_q);
5202 init_waitqueue_head(&ap->eh_wait_q);
5203 init_timer_deferrable(&ap->fastdrain_timer);
5204 ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
5205 ap->fastdrain_timer.data = (unsigned long)ap;
5207 ap->cbl = ATA_CBL_NONE;
5209 ata_link_init(ap, &ap->link, 0);
5212 ap->stats.unhandled_irq = 1;
5213 ap->stats.idle_irq = 1;
5218 static void ata_host_release(struct device *gendev, void *res)
5220 struct ata_host *host = dev_get_drvdata(gendev);
5223 for (i = 0; i < host->n_ports; i++) {
5224 struct ata_port *ap = host->ports[i];
5230 scsi_host_put(ap->scsi_host);
5232 kfree(ap->pmp_link);
5234 host->ports[i] = NULL;
5237 dev_set_drvdata(gendev, NULL);
5241 * ata_host_alloc - allocate and init basic ATA host resources
5242 * @dev: generic device this host is associated with
5243 * @max_ports: maximum number of ATA ports associated with this host
5245 * Allocate and initialize basic ATA host resources. LLD calls
5246 * this function to allocate a host, initializes it fully and
5247 * attaches it using ata_host_register().
5249 * @max_ports ports are allocated and host->n_ports is
5250 * initialized to @max_ports. The caller is allowed to decrease
5251 * host->n_ports before calling ata_host_register(). The unused
5252 * ports will be automatically freed on registration.
5255 * Allocate ATA host on success, NULL on failure.
5258 * Inherited from calling layer (may sleep).
5260 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
5262 struct ata_host *host;
5268 if (!devres_open_group(dev, NULL, GFP_KERNEL))
5271 /* alloc a container for our list of ATA ports (buses) */
5272 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
5273 /* alloc a container for our list of ATA ports (buses) */
5274 host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
5278 devres_add(dev, host);
5279 dev_set_drvdata(dev, host);
5281 spin_lock_init(&host->lock);
5283 host->n_ports = max_ports;
5285 /* allocate ports bound to this host */
5286 for (i = 0; i < max_ports; i++) {
5287 struct ata_port *ap;
5289 ap = ata_port_alloc(host);
5294 host->ports[i] = ap;
5297 devres_remove_group(dev, NULL);
5301 devres_release_group(dev, NULL);
5306 * ata_host_alloc_pinfo - alloc host and init with port_info array
5307 * @dev: generic device this host is associated with
5308 * @ppi: array of ATA port_info to initialize host with
5309 * @n_ports: number of ATA ports attached to this host
5311 * Allocate ATA host and initialize with info from @ppi. If NULL
5312 * terminated, @ppi may contain fewer entries than @n_ports. The
5313 * last entry will be used for the remaining ports.
5316 * Allocate ATA host on success, NULL on failure.
5319 * Inherited from calling layer (may sleep).
5321 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
5322 const struct ata_port_info * const * ppi,
5325 const struct ata_port_info *pi;
5326 struct ata_host *host;
5329 host = ata_host_alloc(dev, n_ports);
5333 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
5334 struct ata_port *ap = host->ports[i];
5339 ap->pio_mask = pi->pio_mask;
5340 ap->mwdma_mask = pi->mwdma_mask;
5341 ap->udma_mask = pi->udma_mask;
5342 ap->flags |= pi->flags;
5343 ap->link.flags |= pi->link_flags;
5344 ap->ops = pi->port_ops;
5346 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
5347 host->ops = pi->port_ops;
5353 static void ata_host_stop(struct device *gendev, void *res)
5355 struct ata_host *host = dev_get_drvdata(gendev);
5358 WARN_ON(!(host->flags & ATA_HOST_STARTED));
5360 for (i = 0; i < host->n_ports; i++) {
5361 struct ata_port *ap = host->ports[i];
5363 if (ap->ops->port_stop)
5364 ap->ops->port_stop(ap);
5367 if (host->ops->host_stop)
5368 host->ops->host_stop(host);
5372 * ata_finalize_port_ops - finalize ata_port_operations
5373 * @ops: ata_port_operations to finalize
5375 * An ata_port_operations can inherit from another ops and that
5376 * ops can again inherit from another. This can go on as many
5377 * times as necessary as long as there is no loop in the
5378 * inheritance chain.
5380 * Ops tables are finalized when the host is started. NULL or
5381 * unspecified entries are inherited from the closet ancestor
5382 * which has the method and the entry is populated with it.
5383 * After finalization, the ops table directly points to all the
5384 * methods and ->inherits is no longer necessary and cleared.
5386 * Using ATA_OP_NULL, inheriting ops can force a method to NULL.
5391 static void ata_finalize_port_ops(struct ata_port_operations *ops)
5393 static spinlock_t lock = SPIN_LOCK_UNLOCKED;
5394 const struct ata_port_operations *cur;
5395 void **begin = (void **)ops;
5396 void **end = (void **)&ops->inherits;
5399 if (!ops || !ops->inherits)
5404 for (cur = ops->inherits; cur; cur = cur->inherits) {
5405 void **inherit = (void **)cur;
5407 for (pp = begin; pp < end; pp++, inherit++)
5412 for (pp = begin; pp < end; pp++)
5416 ops->inherits = NULL;
5422 * ata_host_start - start and freeze ports of an ATA host
5423 * @host: ATA host to start ports for
5425 * Start and then freeze ports of @host. Started status is
5426 * recorded in host->flags, so this function can be called
5427 * multiple times. Ports are guaranteed to get started only
5428 * once. If host->ops isn't initialized yet, its set to the
5429 * first non-dummy port ops.
5432 * Inherited from calling layer (may sleep).
5435 * 0 if all ports are started successfully, -errno otherwise.
5437 int ata_host_start(struct ata_host *host)
5440 void *start_dr = NULL;
5443 if (host->flags & ATA_HOST_STARTED)
5446 ata_finalize_port_ops(host->ops);
5448 for (i = 0; i < host->n_ports; i++) {
5449 struct ata_port *ap = host->ports[i];
5451 ata_finalize_port_ops(ap->ops);
5453 if (!host->ops && !ata_port_is_dummy(ap))
5454 host->ops = ap->ops;
5456 if (ap->ops->port_stop)
5460 if (host->ops->host_stop)
5464 start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
5469 for (i = 0; i < host->n_ports; i++) {
5470 struct ata_port *ap = host->ports[i];
5472 if (ap->ops->port_start) {
5473 rc = ap->ops->port_start(ap);
5476 dev_printk(KERN_ERR, host->dev,
5477 "failed to start port %d "
5478 "(errno=%d)\n", i, rc);
5482 ata_eh_freeze_port(ap);
5486 devres_add(host->dev, start_dr);
5487 host->flags |= ATA_HOST_STARTED;
5492 struct ata_port *ap = host->ports[i];
5494 if (ap->ops->port_stop)
5495 ap->ops->port_stop(ap);
5497 devres_free(start_dr);
5502 * ata_sas_host_init - Initialize a host struct
5503 * @host: host to initialize
5504 * @dev: device host is attached to
5505 * @flags: host flags
5509 * PCI/etc. bus probe sem.
5512 /* KILLME - the only user left is ipr */
5513 void ata_host_init(struct ata_host *host, struct device *dev,
5514 unsigned long flags, struct ata_port_operations *ops)
5516 spin_lock_init(&host->lock);
5518 host->flags = flags;
5523 * ata_host_register - register initialized ATA host
5524 * @host: ATA host to register
5525 * @sht: template for SCSI host
5527 * Register initialized ATA host. @host is allocated using
5528 * ata_host_alloc() and fully initialized by LLD. This function
5529 * starts ports, registers @host with ATA and SCSI layers and
5530 * probe registered devices.
5533 * Inherited from calling layer (may sleep).
5536 * 0 on success, -errno otherwise.
5538 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
5542 /* host must have been started */
5543 if (!(host->flags & ATA_HOST_STARTED)) {
5544 dev_printk(KERN_ERR, host->dev,
5545 "BUG: trying to register unstarted host\n");
5550 /* Blow away unused ports. This happens when LLD can't
5551 * determine the exact number of ports to allocate at
5554 for (i = host->n_ports; host->ports[i]; i++)
5555 kfree(host->ports[i]);
5557 /* give ports names and add SCSI hosts */
5558 for (i = 0; i < host->n_ports; i++)
5559 host->ports[i]->print_id = ata_print_id++;
5561 rc = ata_scsi_add_hosts(host, sht);
5565 /* associate with ACPI nodes */
5566 ata_acpi_associate(host);
5568 /* set cable, sata_spd_limit and report */
5569 for (i = 0; i < host->n_ports; i++) {
5570 struct ata_port *ap = host->ports[i];
5571 unsigned long xfer_mask;
5573 /* set SATA cable type if still unset */
5574 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
5575 ap->cbl = ATA_CBL_SATA;
5577 /* init sata_spd_limit to the current value */
5578 sata_link_init_spd(&ap->link);
5580 /* print per-port info to dmesg */
5581 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
5584 if (!ata_port_is_dummy(ap)) {
5585 ata_port_printk(ap, KERN_INFO,
5586 "%cATA max %s %s\n",
5587 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
5588 ata_mode_string(xfer_mask),
5589 ap->link.eh_info.desc);
5590 ata_ehi_clear_desc(&ap->link.eh_info);
5592 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
5595 /* perform each probe synchronously */
5596 DPRINTK("probe begin\n");
5597 for (i = 0; i < host->n_ports; i++) {
5598 struct ata_port *ap = host->ports[i];
5601 if (ap->ops->error_handler) {
5602 struct ata_eh_info *ehi = &ap->link.eh_info;
5603 unsigned long flags;
5607 /* kick EH for boot probing */
5608 spin_lock_irqsave(ap->lock, flags);
5610 ehi->probe_mask |= ATA_ALL_DEVICES;
5611 ehi->action |= ATA_EH_RESET;
5612 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5614 ap->pflags &= ~ATA_PFLAG_INITIALIZING;
5615 ap->pflags |= ATA_PFLAG_LOADING;
5616 ata_port_schedule_eh(ap);
5618 spin_unlock_irqrestore(ap->lock, flags);
5620 /* wait for EH to finish */
5621 ata_port_wait_eh(ap);
5623 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
5624 rc = ata_bus_probe(ap);
5625 DPRINTK("ata%u: bus probe end\n", ap->print_id);
5628 /* FIXME: do something useful here?
5629 * Current libata behavior will
5630 * tear down everything when
5631 * the module is removed
5632 * or the h/w is unplugged.
5638 /* probes are done, now scan each port's disk(s) */
5639 DPRINTK("host probe begin\n");
5640 for (i = 0; i < host->n_ports; i++) {
5641 struct ata_port *ap = host->ports[i];
5643 ata_scsi_scan_host(ap, 1);
5644 ata_lpm_schedule(ap, ap->pm_policy);
5651 * ata_host_activate - start host, request IRQ and register it
5652 * @host: target ATA host
5653 * @irq: IRQ to request
5654 * @irq_handler: irq_handler used when requesting IRQ
5655 * @irq_flags: irq_flags used when requesting IRQ
5656 * @sht: scsi_host_template to use when registering the host
5658 * After allocating an ATA host and initializing it, most libata
5659 * LLDs perform three steps to activate the host - start host,
5660 * request IRQ and register it. This helper takes necessasry
5661 * arguments and performs the three steps in one go.
5663 * An invalid IRQ skips the IRQ registration and expects the host to
5664 * have set polling mode on the port. In this case, @irq_handler
5668 * Inherited from calling layer (may sleep).
5671 * 0 on success, -errno otherwise.
5673 int ata_host_activate(struct ata_host *host, int irq,
5674 irq_handler_t irq_handler, unsigned long irq_flags,
5675 struct scsi_host_template *sht)
5679 rc = ata_host_start(host);
5683 /* Special case for polling mode */
5685 WARN_ON(irq_handler);
5686 return ata_host_register(host, sht);
5689 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
5690 dev_driver_string(host->dev), host);
5694 for (i = 0; i < host->n_ports; i++)
5695 ata_port_desc(host->ports[i], "irq %d", irq);
5697 rc = ata_host_register(host, sht);
5698 /* if failed, just free the IRQ and leave ports alone */
5700 devm_free_irq(host->dev, irq, host);
5706 * ata_port_detach - Detach ATA port in prepration of device removal
5707 * @ap: ATA port to be detached
5709 * Detach all ATA devices and the associated SCSI devices of @ap;
5710 * then, remove the associated SCSI host. @ap is guaranteed to
5711 * be quiescent on return from this function.
5714 * Kernel thread context (may sleep).
5716 static void ata_port_detach(struct ata_port *ap)
5718 unsigned long flags;
5719 struct ata_link *link;
5720 struct ata_device *dev;
5722 if (!ap->ops->error_handler)
5725 /* tell EH we're leaving & flush EH */
5726 spin_lock_irqsave(ap->lock, flags);
5727 ap->pflags |= ATA_PFLAG_UNLOADING;
5728 spin_unlock_irqrestore(ap->lock, flags);
5730 ata_port_wait_eh(ap);
5732 /* EH is now guaranteed to see UNLOADING - EH context belongs
5733 * to us. Disable all existing devices.
5735 ata_port_for_each_link(link, ap) {
5736 ata_link_for_each_dev(dev, link)
5737 ata_dev_disable(dev);
5740 /* Final freeze & EH. All in-flight commands are aborted. EH
5741 * will be skipped and retrials will be terminated with bad
5744 spin_lock_irqsave(ap->lock, flags);
5745 ata_port_freeze(ap); /* won't be thawed */
5746 spin_unlock_irqrestore(ap->lock, flags);
5748 ata_port_wait_eh(ap);
5749 cancel_rearming_delayed_work(&ap->hotplug_task);
5752 /* remove the associated SCSI host */
5753 scsi_remove_host(ap->scsi_host);
5757 * ata_host_detach - Detach all ports of an ATA host
5758 * @host: Host to detach
5760 * Detach all ports of @host.
5763 * Kernel thread context (may sleep).
5765 void ata_host_detach(struct ata_host *host)
5769 for (i = 0; i < host->n_ports; i++)
5770 ata_port_detach(host->ports[i]);
5772 /* the host is dead now, dissociate ACPI */
5773 ata_acpi_dissociate(host);
5779 * ata_pci_remove_one - PCI layer callback for device removal
5780 * @pdev: PCI device that was removed
5782 * PCI layer indicates to libata via this hook that hot-unplug or
5783 * module unload event has occurred. Detach all ports. Resource
5784 * release is handled via devres.
5787 * Inherited from PCI layer (may sleep).
5789 void ata_pci_remove_one(struct pci_dev *pdev)
5791 struct device *dev = &pdev->dev;
5792 struct ata_host *host = dev_get_drvdata(dev);
5794 ata_host_detach(host);
5797 /* move to PCI subsystem */
5798 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
5800 unsigned long tmp = 0;
5802 switch (bits->width) {
5805 pci_read_config_byte(pdev, bits->reg, &tmp8);
5811 pci_read_config_word(pdev, bits->reg, &tmp16);
5817 pci_read_config_dword(pdev, bits->reg, &tmp32);
5828 return (tmp == bits->val) ? 1 : 0;
5832 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
5834 pci_save_state(pdev);
5835 pci_disable_device(pdev);
5837 if (mesg.event & PM_EVENT_SLEEP)
5838 pci_set_power_state(pdev, PCI_D3hot);
5841 int ata_pci_device_do_resume(struct pci_dev *pdev)
5845 pci_set_power_state(pdev, PCI_D0);
5846 pci_restore_state(pdev);
5848 rc = pcim_enable_device(pdev);
5850 dev_printk(KERN_ERR, &pdev->dev,
5851 "failed to enable device after resume (%d)\n", rc);
5855 pci_set_master(pdev);
5859 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
5861 struct ata_host *host = dev_get_drvdata(&pdev->dev);
5864 rc = ata_host_suspend(host, mesg);
5868 ata_pci_device_do_suspend(pdev, mesg);
5873 int ata_pci_device_resume(struct pci_dev *pdev)
5875 struct ata_host *host = dev_get_drvdata(&pdev->dev);
5878 rc = ata_pci_device_do_resume(pdev);
5880 ata_host_resume(host);
5883 #endif /* CONFIG_PM */
5885 #endif /* CONFIG_PCI */
5887 static int __init ata_parse_force_one(char **cur,
5888 struct ata_force_ent *force_ent,
5889 const char **reason)
5891 /* FIXME: Currently, there's no way to tag init const data and
5892 * using __initdata causes build failure on some versions of
5893 * gcc. Once __initdataconst is implemented, add const to the
5894 * following structure.
5896 static struct ata_force_param force_tbl[] __initdata = {
5897 { "40c", .cbl = ATA_CBL_PATA40 },
5898 { "80c", .cbl = ATA_CBL_PATA80 },
5899 { "short40c", .cbl = ATA_CBL_PATA40_SHORT },
5900 { "unk", .cbl = ATA_CBL_PATA_UNK },
5901 { "ign", .cbl = ATA_CBL_PATA_IGN },
5902 { "sata", .cbl = ATA_CBL_SATA },
5903 { "1.5Gbps", .spd_limit = 1 },
5904 { "3.0Gbps", .spd_limit = 2 },
5905 { "noncq", .horkage_on = ATA_HORKAGE_NONCQ },
5906 { "ncq", .horkage_off = ATA_HORKAGE_NONCQ },
5907 { "pio0", .xfer_mask = 1 << (ATA_SHIFT_PIO + 0) },
5908 { "pio1", .xfer_mask = 1 << (ATA_SHIFT_PIO + 1) },
5909 { "pio2", .xfer_mask = 1 << (ATA_SHIFT_PIO + 2) },
5910 { "pio3", .xfer_mask = 1 << (ATA_SHIFT_PIO + 3) },
5911 { "pio4", .xfer_mask = 1 << (ATA_SHIFT_PIO + 4) },
5912 { "pio5", .xfer_mask = 1 << (ATA_SHIFT_PIO + 5) },
5913 { "pio6", .xfer_mask = 1 << (ATA_SHIFT_PIO + 6) },
5914 { "mwdma0", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 0) },
5915 { "mwdma1", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 1) },
5916 { "mwdma2", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 2) },
5917 { "mwdma3", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 3) },
5918 { "mwdma4", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 4) },
5919 { "udma0", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
5920 { "udma16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
5921 { "udma/16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
5922 { "udma1", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
5923 { "udma25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
5924 { "udma/25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
5925 { "udma2", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
5926 { "udma33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
5927 { "udma/33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
5928 { "udma3", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
5929 { "udma44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
5930 { "udma/44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
5931 { "udma4", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
5932 { "udma66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
5933 { "udma/66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
5934 { "udma5", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
5935 { "udma100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
5936 { "udma/100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
5937 { "udma6", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
5938 { "udma133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
5939 { "udma/133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
5940 { "udma7", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 7) },
5942 char *start = *cur, *p = *cur;
5943 char *id, *val, *endp;
5944 const struct ata_force_param *match_fp = NULL;
5945 int nr_matches = 0, i;
5947 /* find where this param ends and update *cur */
5948 while (*p != '\0' && *p != ',')
5959 p = strchr(start, ':');
5961 val = strstrip(start);
5966 id = strstrip(start);
5967 val = strstrip(p + 1);
5970 p = strchr(id, '.');
5973 force_ent->device = simple_strtoul(p, &endp, 10);
5974 if (p == endp || *endp != '\0') {
5975 *reason = "invalid device";
5980 force_ent->port = simple_strtoul(id, &endp, 10);
5981 if (p == endp || *endp != '\0') {
5982 *reason = "invalid port/link";
5987 /* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */
5988 for (i = 0; i < ARRAY_SIZE(force_tbl); i++) {
5989 const struct ata_force_param *fp = &force_tbl[i];
5991 if (strncasecmp(val, fp->name, strlen(val)))
5997 if (strcasecmp(val, fp->name) == 0) {
6004 *reason = "unknown value";
6007 if (nr_matches > 1) {
6008 *reason = "ambigious value";
6012 force_ent->param = *match_fp;
6017 static void __init ata_parse_force_param(void)
6019 int idx = 0, size = 1;
6020 int last_port = -1, last_device = -1;
6021 char *p, *cur, *next;
6023 /* calculate maximum number of params and allocate force_tbl */
6024 for (p = ata_force_param_buf; *p; p++)
6028 ata_force_tbl = kzalloc(sizeof(ata_force_tbl[0]) * size, GFP_KERNEL);
6029 if (!ata_force_tbl) {
6030 printk(KERN_WARNING "ata: failed to extend force table, "
6031 "libata.force ignored\n");
6035 /* parse and populate the table */
6036 for (cur = ata_force_param_buf; *cur != '\0'; cur = next) {
6037 const char *reason = "";
6038 struct ata_force_ent te = { .port = -1, .device = -1 };
6041 if (ata_parse_force_one(&next, &te, &reason)) {
6042 printk(KERN_WARNING "ata: failed to parse force "
6043 "parameter \"%s\" (%s)\n",
6048 if (te.port == -1) {
6049 te.port = last_port;
6050 te.device = last_device;
6053 ata_force_tbl[idx++] = te;
6055 last_port = te.port;
6056 last_device = te.device;
6059 ata_force_tbl_size = idx;
6062 static int __init ata_init(void)
6064 ata_probe_timeout *= HZ;
6066 ata_parse_force_param();
6068 ata_wq = create_workqueue("ata");
6072 ata_aux_wq = create_singlethread_workqueue("ata_aux");
6074 destroy_workqueue(ata_wq);
6078 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
6082 static void __exit ata_exit(void)
6084 kfree(ata_force_tbl);
6085 destroy_workqueue(ata_wq);
6086 destroy_workqueue(ata_aux_wq);
6089 subsys_initcall(ata_init);
6090 module_exit(ata_exit);
6092 static unsigned long ratelimit_time;
6093 static DEFINE_SPINLOCK(ata_ratelimit_lock);
6095 int ata_ratelimit(void)
6098 unsigned long flags;
6100 spin_lock_irqsave(&ata_ratelimit_lock, flags);
6102 if (time_after(jiffies, ratelimit_time)) {
6104 ratelimit_time = jiffies + (HZ/5);
6108 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
6114 * ata_wait_register - wait until register value changes
6115 * @reg: IO-mapped register
6116 * @mask: Mask to apply to read register value
6117 * @val: Wait condition
6118 * @interval_msec: polling interval in milliseconds
6119 * @timeout_msec: timeout in milliseconds
6121 * Waiting for some bits of register to change is a common
6122 * operation for ATA controllers. This function reads 32bit LE
6123 * IO-mapped register @reg and tests for the following condition.
6125 * (*@reg & mask) != val
6127 * If the condition is met, it returns; otherwise, the process is
6128 * repeated after @interval_msec until timeout.
6131 * Kernel thread context (may sleep)
6134 * The final register value.
6136 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
6137 unsigned long interval_msec,
6138 unsigned long timeout_msec)
6140 unsigned long timeout;
6143 tmp = ioread32(reg);
6145 /* Calculate timeout _after_ the first read to make sure
6146 * preceding writes reach the controller before starting to
6147 * eat away the timeout.
6149 timeout = jiffies + (timeout_msec * HZ) / 1000;
6151 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
6152 msleep(interval_msec);
6153 tmp = ioread32(reg);
6162 static void ata_dummy_noret(struct ata_port *ap) { }
6163 static int ata_dummy_ret0(struct ata_port *ap) { return 0; }
6164 static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }
6166 static u8 ata_dummy_check_status(struct ata_port *ap)
6171 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
6173 return AC_ERR_SYSTEM;
6176 struct ata_port_operations ata_dummy_port_ops = {
6177 .sff_check_status = ata_dummy_check_status,
6178 .sff_check_altstatus = ata_dummy_check_status,
6179 .qc_prep = ata_noop_qc_prep,
6180 .qc_issue = ata_dummy_qc_issue,
6181 .freeze = ata_dummy_noret,
6182 .thaw = ata_dummy_noret,
6183 .error_handler = ata_dummy_noret,
6184 .post_internal_cmd = ata_dummy_qc_noret,
6185 .sff_irq_clear = ata_dummy_noret,
6186 .port_start = ata_dummy_ret0,
6187 .port_stop = ata_dummy_noret,
6190 const struct ata_port_info ata_dummy_port_info = {
6191 .port_ops = &ata_dummy_port_ops,
6195 * libata is essentially a library of internal helper functions for
6196 * low-level ATA host controller drivers. As such, the API/ABI is
6197 * likely to change as new drivers are added and updated.
6198 * Do not depend on ABI/API stability.
6200 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
6201 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
6202 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6203 EXPORT_SYMBOL_GPL(ata_base_port_ops);
6204 EXPORT_SYMBOL_GPL(sata_port_ops);
6205 EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
6206 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6207 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
6208 EXPORT_SYMBOL_GPL(ata_std_bios_param);
6209 EXPORT_SYMBOL_GPL(ata_host_init);
6210 EXPORT_SYMBOL_GPL(ata_host_alloc);
6211 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6212 EXPORT_SYMBOL_GPL(ata_host_start);
6213 EXPORT_SYMBOL_GPL(ata_host_register);
6214 EXPORT_SYMBOL_GPL(ata_host_activate);
6215 EXPORT_SYMBOL_GPL(ata_host_detach);
6216 EXPORT_SYMBOL_GPL(ata_sg_init);
6217 EXPORT_SYMBOL_GPL(ata_qc_complete);
6218 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
6219 EXPORT_SYMBOL_GPL(sata_print_link_status);
6220 EXPORT_SYMBOL_GPL(atapi_cmd_type);
6221 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
6222 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6223 EXPORT_SYMBOL_GPL(ata_pack_xfermask);
6224 EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
6225 EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
6226 EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
6227 EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
6228 EXPORT_SYMBOL_GPL(ata_mode_string);
6229 EXPORT_SYMBOL_GPL(ata_id_xfermask);
6230 EXPORT_SYMBOL_GPL(ata_port_start);
6231 EXPORT_SYMBOL_GPL(ata_do_set_mode);
6232 EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6233 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
6234 EXPORT_SYMBOL_GPL(ata_port_probe);
6235 EXPORT_SYMBOL_GPL(ata_dev_disable);
6236 EXPORT_SYMBOL_GPL(sata_set_spd);
6237 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6238 EXPORT_SYMBOL_GPL(sata_link_debounce);
6239 EXPORT_SYMBOL_GPL(sata_link_resume);
6240 EXPORT_SYMBOL_GPL(ata_std_prereset);
6241 EXPORT_SYMBOL_GPL(sata_link_hardreset);
6242 EXPORT_SYMBOL_GPL(sata_std_hardreset);
6243 EXPORT_SYMBOL_GPL(ata_std_postreset);
6244 EXPORT_SYMBOL_GPL(ata_dev_classify);
6245 EXPORT_SYMBOL_GPL(ata_dev_pair);
6246 EXPORT_SYMBOL_GPL(ata_port_disable);
6247 EXPORT_SYMBOL_GPL(ata_ratelimit);
6248 EXPORT_SYMBOL_GPL(ata_wait_register);
6249 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
6250 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
6251 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6252 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6253 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6254 EXPORT_SYMBOL_GPL(sata_scr_valid);
6255 EXPORT_SYMBOL_GPL(sata_scr_read);
6256 EXPORT_SYMBOL_GPL(sata_scr_write);
6257 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
6258 EXPORT_SYMBOL_GPL(ata_link_online);
6259 EXPORT_SYMBOL_GPL(ata_link_offline);
6261 EXPORT_SYMBOL_GPL(ata_host_suspend);
6262 EXPORT_SYMBOL_GPL(ata_host_resume);
6263 #endif /* CONFIG_PM */
6264 EXPORT_SYMBOL_GPL(ata_id_string);
6265 EXPORT_SYMBOL_GPL(ata_id_c_string);
6266 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
6268 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6269 EXPORT_SYMBOL_GPL(ata_timing_find_mode);
6270 EXPORT_SYMBOL_GPL(ata_timing_compute);
6271 EXPORT_SYMBOL_GPL(ata_timing_merge);
6272 EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
6275 EXPORT_SYMBOL_GPL(pci_test_config_bits);
6276 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6278 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
6279 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
6280 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
6281 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6282 #endif /* CONFIG_PM */
6283 #endif /* CONFIG_PCI */
6285 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
6286 EXPORT_SYMBOL_GPL(sata_pmp_error_handler);
6288 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
6289 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
6290 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6291 EXPORT_SYMBOL_GPL(ata_port_desc);
6293 EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
6294 #endif /* CONFIG_PCI */
6295 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6296 EXPORT_SYMBOL_GPL(ata_link_abort);
6297 EXPORT_SYMBOL_GPL(ata_port_abort);
6298 EXPORT_SYMBOL_GPL(ata_port_freeze);
6299 EXPORT_SYMBOL_GPL(sata_async_notification);
6300 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
6301 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6302 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
6303 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6304 EXPORT_SYMBOL_GPL(ata_do_eh);
6305 EXPORT_SYMBOL_GPL(ata_std_error_handler);
6307 EXPORT_SYMBOL_GPL(ata_cable_40wire);
6308 EXPORT_SYMBOL_GPL(ata_cable_80wire);
6309 EXPORT_SYMBOL_GPL(ata_cable_unknown);
6310 EXPORT_SYMBOL_GPL(ata_cable_ignore);
6311 EXPORT_SYMBOL_GPL(ata_cable_sata);