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 .hardreset = sata_sff_hardreset,
79 .postreset = ata_std_postreset,
80 .error_handler = ata_std_error_handler,
83 const struct ata_port_operations sata_port_ops = {
84 .inherits = &ata_base_port_ops,
86 .qc_defer = ata_std_qc_defer,
87 .sff_dev_select = ata_noop_dev_select,
90 const struct ata_port_operations sata_pmp_port_ops = {
91 .inherits = &sata_port_ops,
93 .pmp_prereset = sata_pmp_std_prereset,
94 .pmp_hardreset = sata_pmp_std_hardreset,
95 .pmp_postreset = sata_pmp_std_postreset,
96 .error_handler = sata_pmp_error_handler,
99 static unsigned int ata_dev_init_params(struct ata_device *dev,
100 u16 heads, u16 sectors);
101 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
102 static unsigned int ata_dev_set_feature(struct ata_device *dev,
103 u8 enable, u8 feature);
104 static void ata_dev_xfermask(struct ata_device *dev);
105 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
107 unsigned int ata_print_id = 1;
108 static struct workqueue_struct *ata_wq;
110 struct workqueue_struct *ata_aux_wq;
112 struct ata_force_param {
116 unsigned long xfer_mask;
117 unsigned int horkage_on;
118 unsigned int horkage_off;
121 struct ata_force_ent {
124 struct ata_force_param param;
127 static struct ata_force_ent *ata_force_tbl;
128 static int ata_force_tbl_size;
130 static char ata_force_param_buf[PAGE_SIZE] __initdata;
131 /* param_buf is thrown away after initialization, disallow read */
132 module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
133 MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/kernel-parameters.txt for details)");
135 int atapi_enabled = 1;
136 module_param(atapi_enabled, int, 0444);
137 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
139 static int atapi_dmadir = 0;
140 module_param(atapi_dmadir, int, 0444);
141 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
143 int atapi_passthru16 = 1;
144 module_param(atapi_passthru16, int, 0444);
145 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");
148 module_param_named(fua, libata_fua, int, 0444);
149 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
151 static int ata_ignore_hpa;
152 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
153 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
155 static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
156 module_param_named(dma, libata_dma_mask, int, 0444);
157 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
159 static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
160 module_param(ata_probe_timeout, int, 0444);
161 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
163 int libata_noacpi = 0;
164 module_param_named(noacpi, libata_noacpi, int, 0444);
165 MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set");
167 int libata_allow_tpm = 0;
168 module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
169 MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands");
171 MODULE_AUTHOR("Jeff Garzik");
172 MODULE_DESCRIPTION("Library module for ATA devices");
173 MODULE_LICENSE("GPL");
174 MODULE_VERSION(DRV_VERSION);
178 * ata_force_cbl - force cable type according to libata.force
179 * @ap: ATA port of interest
181 * Force cable type according to libata.force and whine about it.
182 * The last entry which has matching port number is used, so it
183 * can be specified as part of device force parameters. For
184 * example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
190 void ata_force_cbl(struct ata_port *ap)
194 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
195 const struct ata_force_ent *fe = &ata_force_tbl[i];
197 if (fe->port != -1 && fe->port != ap->print_id)
200 if (fe->param.cbl == ATA_CBL_NONE)
203 ap->cbl = fe->param.cbl;
204 ata_port_printk(ap, KERN_NOTICE,
205 "FORCE: cable set to %s\n", fe->param.name);
211 * ata_force_spd_limit - force SATA spd limit according to libata.force
212 * @link: ATA link of interest
214 * Force SATA spd limit according to libata.force and whine about
215 * it. When only the port part is specified (e.g. 1:), the limit
216 * applies to all links connected to both the host link and all
217 * fan-out ports connected via PMP. If the device part is
218 * specified as 0 (e.g. 1.00:), it specifies the first fan-out
219 * link not the host link. Device number 15 always points to the
220 * host link whether PMP is attached or not.
225 static void ata_force_spd_limit(struct ata_link *link)
229 if (ata_is_host_link(link))
234 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
235 const struct ata_force_ent *fe = &ata_force_tbl[i];
237 if (fe->port != -1 && fe->port != link->ap->print_id)
240 if (fe->device != -1 && fe->device != linkno)
243 if (!fe->param.spd_limit)
246 link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
247 ata_link_printk(link, KERN_NOTICE,
248 "FORCE: PHY spd limit set to %s\n", fe->param.name);
254 * ata_force_xfermask - force xfermask according to libata.force
255 * @dev: ATA device of interest
257 * Force xfer_mask according to libata.force and whine about it.
258 * For consistency with link selection, device number 15 selects
259 * the first device connected to the host link.
264 static void ata_force_xfermask(struct ata_device *dev)
266 int devno = dev->link->pmp + dev->devno;
267 int alt_devno = devno;
270 /* allow n.15 for the first device attached to host port */
271 if (ata_is_host_link(dev->link) && devno == 0)
274 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
275 const struct ata_force_ent *fe = &ata_force_tbl[i];
276 unsigned long pio_mask, mwdma_mask, udma_mask;
278 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
281 if (fe->device != -1 && fe->device != devno &&
282 fe->device != alt_devno)
285 if (!fe->param.xfer_mask)
288 ata_unpack_xfermask(fe->param.xfer_mask,
289 &pio_mask, &mwdma_mask, &udma_mask);
291 dev->udma_mask = udma_mask;
292 else if (mwdma_mask) {
294 dev->mwdma_mask = mwdma_mask;
298 dev->pio_mask = pio_mask;
301 ata_dev_printk(dev, KERN_NOTICE,
302 "FORCE: xfer_mask set to %s\n", fe->param.name);
308 * ata_force_horkage - force horkage according to libata.force
309 * @dev: ATA device of interest
311 * Force horkage according to libata.force and whine about it.
312 * For consistency with link selection, device number 15 selects
313 * the first device connected to the host link.
318 static void ata_force_horkage(struct ata_device *dev)
320 int devno = dev->link->pmp + dev->devno;
321 int alt_devno = devno;
324 /* allow n.15 for the first device attached to host port */
325 if (ata_is_host_link(dev->link) && devno == 0)
328 for (i = 0; i < ata_force_tbl_size; i++) {
329 const struct ata_force_ent *fe = &ata_force_tbl[i];
331 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
334 if (fe->device != -1 && fe->device != devno &&
335 fe->device != alt_devno)
338 if (!(~dev->horkage & fe->param.horkage_on) &&
339 !(dev->horkage & fe->param.horkage_off))
342 dev->horkage |= fe->param.horkage_on;
343 dev->horkage &= ~fe->param.horkage_off;
345 ata_dev_printk(dev, KERN_NOTICE,
346 "FORCE: horkage modified (%s)\n", fe->param.name);
351 * atapi_cmd_type - Determine ATAPI command type from SCSI opcode
352 * @opcode: SCSI opcode
354 * Determine ATAPI command type from @opcode.
360 * ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC}
362 int atapi_cmd_type(u8 opcode)
371 case GPCMD_WRITE_AND_VERIFY_10:
375 case GPCMD_READ_CD_MSF:
376 return ATAPI_READ_CD;
380 if (atapi_passthru16)
381 return ATAPI_PASS_THRU;
389 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
390 * @tf: Taskfile to convert
391 * @pmp: Port multiplier port
392 * @is_cmd: This FIS is for command
393 * @fis: Buffer into which data will output
395 * Converts a standard ATA taskfile to a Serial ATA
396 * FIS structure (Register - Host to Device).
399 * Inherited from caller.
401 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
403 fis[0] = 0x27; /* Register - Host to Device FIS */
404 fis[1] = pmp & 0xf; /* Port multiplier number*/
406 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
408 fis[2] = tf->command;
409 fis[3] = tf->feature;
416 fis[8] = tf->hob_lbal;
417 fis[9] = tf->hob_lbam;
418 fis[10] = tf->hob_lbah;
419 fis[11] = tf->hob_feature;
422 fis[13] = tf->hob_nsect;
433 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
434 * @fis: Buffer from which data will be input
435 * @tf: Taskfile to output
437 * Converts a serial ATA FIS structure to a standard ATA taskfile.
440 * Inherited from caller.
443 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
445 tf->command = fis[2]; /* status */
446 tf->feature = fis[3]; /* error */
453 tf->hob_lbal = fis[8];
454 tf->hob_lbam = fis[9];
455 tf->hob_lbah = fis[10];
458 tf->hob_nsect = fis[13];
461 static const u8 ata_rw_cmds[] = {
465 ATA_CMD_READ_MULTI_EXT,
466 ATA_CMD_WRITE_MULTI_EXT,
470 ATA_CMD_WRITE_MULTI_FUA_EXT,
474 ATA_CMD_PIO_READ_EXT,
475 ATA_CMD_PIO_WRITE_EXT,
488 ATA_CMD_WRITE_FUA_EXT
492 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
493 * @tf: command to examine and configure
494 * @dev: device tf belongs to
496 * Examine the device configuration and tf->flags to calculate
497 * the proper read/write commands and protocol to use.
502 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
506 int index, fua, lba48, write;
508 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
509 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
510 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
512 if (dev->flags & ATA_DFLAG_PIO) {
513 tf->protocol = ATA_PROT_PIO;
514 index = dev->multi_count ? 0 : 8;
515 } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
516 /* Unable to use DMA due to host limitation */
517 tf->protocol = ATA_PROT_PIO;
518 index = dev->multi_count ? 0 : 8;
520 tf->protocol = ATA_PROT_DMA;
524 cmd = ata_rw_cmds[index + fua + lba48 + write];
533 * ata_tf_read_block - Read block address from ATA taskfile
534 * @tf: ATA taskfile of interest
535 * @dev: ATA device @tf belongs to
540 * Read block address from @tf. This function can handle all
541 * three address formats - LBA, LBA48 and CHS. tf->protocol and
542 * flags select the address format to use.
545 * Block address read from @tf.
547 u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
551 if (tf->flags & ATA_TFLAG_LBA) {
552 if (tf->flags & ATA_TFLAG_LBA48) {
553 block |= (u64)tf->hob_lbah << 40;
554 block |= (u64)tf->hob_lbam << 32;
555 block |= tf->hob_lbal << 24;
557 block |= (tf->device & 0xf) << 24;
559 block |= tf->lbah << 16;
560 block |= tf->lbam << 8;
565 cyl = tf->lbam | (tf->lbah << 8);
566 head = tf->device & 0xf;
569 block = (cyl * dev->heads + head) * dev->sectors + sect;
576 * ata_build_rw_tf - Build ATA taskfile for given read/write request
577 * @tf: Target ATA taskfile
578 * @dev: ATA device @tf belongs to
579 * @block: Block address
580 * @n_block: Number of blocks
581 * @tf_flags: RW/FUA etc...
587 * Build ATA taskfile @tf for read/write request described by
588 * @block, @n_block, @tf_flags and @tag on @dev.
592 * 0 on success, -ERANGE if the request is too large for @dev,
593 * -EINVAL if the request is invalid.
595 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
596 u64 block, u32 n_block, unsigned int tf_flags,
599 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
600 tf->flags |= tf_flags;
602 if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
604 if (!lba_48_ok(block, n_block))
607 tf->protocol = ATA_PROT_NCQ;
608 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
610 if (tf->flags & ATA_TFLAG_WRITE)
611 tf->command = ATA_CMD_FPDMA_WRITE;
613 tf->command = ATA_CMD_FPDMA_READ;
615 tf->nsect = tag << 3;
616 tf->hob_feature = (n_block >> 8) & 0xff;
617 tf->feature = n_block & 0xff;
619 tf->hob_lbah = (block >> 40) & 0xff;
620 tf->hob_lbam = (block >> 32) & 0xff;
621 tf->hob_lbal = (block >> 24) & 0xff;
622 tf->lbah = (block >> 16) & 0xff;
623 tf->lbam = (block >> 8) & 0xff;
624 tf->lbal = block & 0xff;
627 if (tf->flags & ATA_TFLAG_FUA)
628 tf->device |= 1 << 7;
629 } else if (dev->flags & ATA_DFLAG_LBA) {
630 tf->flags |= ATA_TFLAG_LBA;
632 if (lba_28_ok(block, n_block)) {
634 tf->device |= (block >> 24) & 0xf;
635 } else if (lba_48_ok(block, n_block)) {
636 if (!(dev->flags & ATA_DFLAG_LBA48))
640 tf->flags |= ATA_TFLAG_LBA48;
642 tf->hob_nsect = (n_block >> 8) & 0xff;
644 tf->hob_lbah = (block >> 40) & 0xff;
645 tf->hob_lbam = (block >> 32) & 0xff;
646 tf->hob_lbal = (block >> 24) & 0xff;
648 /* request too large even for LBA48 */
651 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
654 tf->nsect = n_block & 0xff;
656 tf->lbah = (block >> 16) & 0xff;
657 tf->lbam = (block >> 8) & 0xff;
658 tf->lbal = block & 0xff;
660 tf->device |= ATA_LBA;
663 u32 sect, head, cyl, track;
665 /* The request -may- be too large for CHS addressing. */
666 if (!lba_28_ok(block, n_block))
669 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
672 /* Convert LBA to CHS */
673 track = (u32)block / dev->sectors;
674 cyl = track / dev->heads;
675 head = track % dev->heads;
676 sect = (u32)block % dev->sectors + 1;
678 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
679 (u32)block, track, cyl, head, sect);
681 /* Check whether the converted CHS can fit.
685 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
688 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
699 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
700 * @pio_mask: pio_mask
701 * @mwdma_mask: mwdma_mask
702 * @udma_mask: udma_mask
704 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
705 * unsigned int xfer_mask.
713 unsigned long ata_pack_xfermask(unsigned long pio_mask,
714 unsigned long mwdma_mask,
715 unsigned long udma_mask)
717 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
718 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
719 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
723 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
724 * @xfer_mask: xfer_mask to unpack
725 * @pio_mask: resulting pio_mask
726 * @mwdma_mask: resulting mwdma_mask
727 * @udma_mask: resulting udma_mask
729 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
730 * Any NULL distination masks will be ignored.
732 void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
733 unsigned long *mwdma_mask, unsigned long *udma_mask)
736 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
738 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
740 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
743 static const struct ata_xfer_ent {
747 { ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
748 { ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
749 { ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
754 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
755 * @xfer_mask: xfer_mask of interest
757 * Return matching XFER_* value for @xfer_mask. Only the highest
758 * bit of @xfer_mask is considered.
764 * Matching XFER_* value, 0xff if no match found.
766 u8 ata_xfer_mask2mode(unsigned long xfer_mask)
768 int highbit = fls(xfer_mask) - 1;
769 const struct ata_xfer_ent *ent;
771 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
772 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
773 return ent->base + highbit - ent->shift;
778 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
779 * @xfer_mode: XFER_* of interest
781 * Return matching xfer_mask for @xfer_mode.
787 * Matching xfer_mask, 0 if no match found.
789 unsigned long ata_xfer_mode2mask(u8 xfer_mode)
791 const struct ata_xfer_ent *ent;
793 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
794 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
795 return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
796 & ~((1 << ent->shift) - 1);
801 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
802 * @xfer_mode: XFER_* of interest
804 * Return matching xfer_shift for @xfer_mode.
810 * Matching xfer_shift, -1 if no match found.
812 int ata_xfer_mode2shift(unsigned long xfer_mode)
814 const struct ata_xfer_ent *ent;
816 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
817 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
823 * ata_mode_string - convert xfer_mask to string
824 * @xfer_mask: mask of bits supported; only highest bit counts.
826 * Determine string which represents the highest speed
827 * (highest bit in @modemask).
833 * Constant C string representing highest speed listed in
834 * @mode_mask, or the constant C string "<n/a>".
836 const char *ata_mode_string(unsigned long xfer_mask)
838 static const char * const xfer_mode_str[] = {
862 highbit = fls(xfer_mask) - 1;
863 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
864 return xfer_mode_str[highbit];
868 static const char *sata_spd_string(unsigned int spd)
870 static const char * const spd_str[] = {
875 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
877 return spd_str[spd - 1];
880 void ata_dev_disable(struct ata_device *dev)
882 if (ata_dev_enabled(dev)) {
883 if (ata_msg_drv(dev->link->ap))
884 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
885 ata_acpi_on_disable(dev);
886 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
892 static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
894 struct ata_link *link = dev->link;
895 struct ata_port *ap = link->ap;
897 unsigned int err_mask;
901 * disallow DIPM for drivers which haven't set
902 * ATA_FLAG_IPM. This is because when DIPM is enabled,
903 * phy ready will be set in the interrupt status on
904 * state changes, which will cause some drivers to
905 * think there are errors - additionally drivers will
906 * need to disable hot plug.
908 if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
909 ap->pm_policy = NOT_AVAILABLE;
914 * For DIPM, we will only enable it for the
917 * Why? Because Disks are too stupid to know that
918 * If the host rejects a request to go to SLUMBER
919 * they should retry at PARTIAL, and instead it
920 * just would give up. So, for medium_power to
921 * work at all, we need to only allow HIPM.
923 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
929 /* no restrictions on IPM transitions */
930 scontrol &= ~(0x3 << 8);
931 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
936 if (dev->flags & ATA_DFLAG_DIPM)
937 err_mask = ata_dev_set_feature(dev,
938 SETFEATURES_SATA_ENABLE, SATA_DIPM);
941 /* allow IPM to PARTIAL */
942 scontrol &= ~(0x1 << 8);
943 scontrol |= (0x2 << 8);
944 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
949 * we don't have to disable DIPM since IPM flags
950 * disallow transitions to SLUMBER, which effectively
951 * disable DIPM if it does not support PARTIAL
955 case MAX_PERFORMANCE:
956 /* disable all IPM transitions */
957 scontrol |= (0x3 << 8);
958 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
963 * we don't have to disable DIPM since IPM flags
964 * disallow all transitions which effectively
965 * disable DIPM anyway.
970 /* FIXME: handle SET FEATURES failure */
977 * ata_dev_enable_pm - enable SATA interface power management
978 * @dev: device to enable power management
979 * @policy: the link power management policy
981 * Enable SATA Interface power management. This will enable
982 * Device Interface Power Management (DIPM) for min_power
983 * policy, and then call driver specific callbacks for
984 * enabling Host Initiated Power management.
987 * Returns: -EINVAL if IPM is not supported, 0 otherwise.
989 void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
992 struct ata_port *ap = dev->link->ap;
994 /* set HIPM first, then DIPM */
995 if (ap->ops->enable_pm)
996 rc = ap->ops->enable_pm(ap, policy);
999 rc = ata_dev_set_dipm(dev, policy);
1003 ap->pm_policy = MAX_PERFORMANCE;
1005 ap->pm_policy = policy;
1006 return /* rc */; /* hopefully we can use 'rc' eventually */
1011 * ata_dev_disable_pm - disable SATA interface power management
1012 * @dev: device to disable power management
1014 * Disable SATA Interface power management. This will disable
1015 * Device Interface Power Management (DIPM) without changing
1016 * policy, call driver specific callbacks for disabling Host
1017 * Initiated Power management.
1022 static void ata_dev_disable_pm(struct ata_device *dev)
1024 struct ata_port *ap = dev->link->ap;
1026 ata_dev_set_dipm(dev, MAX_PERFORMANCE);
1027 if (ap->ops->disable_pm)
1028 ap->ops->disable_pm(ap);
1030 #endif /* CONFIG_PM */
1032 void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
1034 ap->pm_policy = policy;
1035 ap->link.eh_info.action |= ATA_EH_LPM;
1036 ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
1037 ata_port_schedule_eh(ap);
1041 static void ata_lpm_enable(struct ata_host *host)
1043 struct ata_link *link;
1044 struct ata_port *ap;
1045 struct ata_device *dev;
1048 for (i = 0; i < host->n_ports; i++) {
1049 ap = host->ports[i];
1050 ata_port_for_each_link(link, ap) {
1051 ata_link_for_each_dev(dev, link)
1052 ata_dev_disable_pm(dev);
1057 static void ata_lpm_disable(struct ata_host *host)
1061 for (i = 0; i < host->n_ports; i++) {
1062 struct ata_port *ap = host->ports[i];
1063 ata_lpm_schedule(ap, ap->pm_policy);
1066 #endif /* CONFIG_PM */
1069 * ata_dev_classify - determine device type based on ATA-spec signature
1070 * @tf: ATA taskfile register set for device to be identified
1072 * Determine from taskfile register contents whether a device is
1073 * ATA or ATAPI, as per "Signature and persistence" section
1074 * of ATA/PI spec (volume 1, sect 5.14).
1080 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
1081 * %ATA_DEV_UNKNOWN the event of failure.
1083 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
1085 /* Apple's open source Darwin code hints that some devices only
1086 * put a proper signature into the LBA mid/high registers,
1087 * So, we only check those. It's sufficient for uniqueness.
1089 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
1090 * signatures for ATA and ATAPI devices attached on SerialATA,
1091 * 0x3c/0xc3 and 0x69/0x96 respectively. However, SerialATA
1092 * spec has never mentioned about using different signatures
1093 * for ATA/ATAPI devices. Then, Serial ATA II: Port
1094 * Multiplier specification began to use 0x69/0x96 to identify
1095 * port multpliers and 0x3c/0xc3 to identify SEMB device.
1096 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
1097 * 0x69/0x96 shortly and described them as reserved for
1100 * We follow the current spec and consider that 0x69/0x96
1101 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
1103 if ((tf->lbam == 0) && (tf->lbah == 0)) {
1104 DPRINTK("found ATA device by sig\n");
1108 if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
1109 DPRINTK("found ATAPI device by sig\n");
1110 return ATA_DEV_ATAPI;
1113 if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
1114 DPRINTK("found PMP device by sig\n");
1118 if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
1119 printk(KERN_INFO "ata: SEMB device ignored\n");
1120 return ATA_DEV_SEMB_UNSUP; /* not yet */
1123 DPRINTK("unknown device\n");
1124 return ATA_DEV_UNKNOWN;
1128 * ata_id_string - Convert IDENTIFY DEVICE page into string
1129 * @id: IDENTIFY DEVICE results we will examine
1130 * @s: string into which data is output
1131 * @ofs: offset into identify device page
1132 * @len: length of string to return. must be an even number.
1134 * The strings in the IDENTIFY DEVICE page are broken up into
1135 * 16-bit chunks. Run through the string, and output each
1136 * 8-bit chunk linearly, regardless of platform.
1142 void ata_id_string(const u16 *id, unsigned char *s,
1143 unsigned int ofs, unsigned int len)
1162 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1163 * @id: IDENTIFY DEVICE results we will examine
1164 * @s: string into which data is output
1165 * @ofs: offset into identify device page
1166 * @len: length of string to return. must be an odd number.
1168 * This function is identical to ata_id_string except that it
1169 * trims trailing spaces and terminates the resulting string with
1170 * null. @len must be actual maximum length (even number) + 1.
1175 void ata_id_c_string(const u16 *id, unsigned char *s,
1176 unsigned int ofs, unsigned int len)
1180 WARN_ON(!(len & 1));
1182 ata_id_string(id, s, ofs, len - 1);
1184 p = s + strnlen(s, len - 1);
1185 while (p > s && p[-1] == ' ')
1190 static u64 ata_id_n_sectors(const u16 *id)
1192 if (ata_id_has_lba(id)) {
1193 if (ata_id_has_lba48(id))
1194 return ata_id_u64(id, 100);
1196 return ata_id_u32(id, 60);
1198 if (ata_id_current_chs_valid(id))
1199 return ata_id_u32(id, 57);
1201 return id[1] * id[3] * id[6];
1205 u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
1209 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
1210 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1211 sectors |= (tf->hob_lbal & 0xff) << 24;
1212 sectors |= (tf->lbah & 0xff) << 16;
1213 sectors |= (tf->lbam & 0xff) << 8;
1214 sectors |= (tf->lbal & 0xff);
1219 u64 ata_tf_to_lba(const struct ata_taskfile *tf)
1223 sectors |= (tf->device & 0x0f) << 24;
1224 sectors |= (tf->lbah & 0xff) << 16;
1225 sectors |= (tf->lbam & 0xff) << 8;
1226 sectors |= (tf->lbal & 0xff);
1232 * ata_read_native_max_address - Read native max address
1233 * @dev: target device
1234 * @max_sectors: out parameter for the result native max address
1236 * Perform an LBA48 or LBA28 native size query upon the device in
1240 * 0 on success, -EACCES if command is aborted by the drive.
1241 * -EIO on other errors.
1243 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
1245 unsigned int err_mask;
1246 struct ata_taskfile tf;
1247 int lba48 = ata_id_has_lba48(dev->id);
1249 ata_tf_init(dev, &tf);
1251 /* always clear all address registers */
1252 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1255 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
1256 tf.flags |= ATA_TFLAG_LBA48;
1258 tf.command = ATA_CMD_READ_NATIVE_MAX;
1260 tf.protocol |= ATA_PROT_NODATA;
1261 tf.device |= ATA_LBA;
1263 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1265 ata_dev_printk(dev, KERN_WARNING, "failed to read native "
1266 "max address (err_mask=0x%x)\n", err_mask);
1267 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
1273 *max_sectors = ata_tf_to_lba48(&tf) + 1;
1275 *max_sectors = ata_tf_to_lba(&tf) + 1;
1276 if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1282 * ata_set_max_sectors - Set max sectors
1283 * @dev: target device
1284 * @new_sectors: new max sectors value to set for the device
1286 * Set max sectors of @dev to @new_sectors.
1289 * 0 on success, -EACCES if command is aborted or denied (due to
1290 * previous non-volatile SET_MAX) by the drive. -EIO on other
1293 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
1295 unsigned int err_mask;
1296 struct ata_taskfile tf;
1297 int lba48 = ata_id_has_lba48(dev->id);
1301 ata_tf_init(dev, &tf);
1303 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1306 tf.command = ATA_CMD_SET_MAX_EXT;
1307 tf.flags |= ATA_TFLAG_LBA48;
1309 tf.hob_lbal = (new_sectors >> 24) & 0xff;
1310 tf.hob_lbam = (new_sectors >> 32) & 0xff;
1311 tf.hob_lbah = (new_sectors >> 40) & 0xff;
1313 tf.command = ATA_CMD_SET_MAX;
1315 tf.device |= (new_sectors >> 24) & 0xf;
1318 tf.protocol |= ATA_PROT_NODATA;
1319 tf.device |= ATA_LBA;
1321 tf.lbal = (new_sectors >> 0) & 0xff;
1322 tf.lbam = (new_sectors >> 8) & 0xff;
1323 tf.lbah = (new_sectors >> 16) & 0xff;
1325 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1327 ata_dev_printk(dev, KERN_WARNING, "failed to set "
1328 "max address (err_mask=0x%x)\n", err_mask);
1329 if (err_mask == AC_ERR_DEV &&
1330 (tf.feature & (ATA_ABORTED | ATA_IDNF)))
1339 * ata_hpa_resize - Resize a device with an HPA set
1340 * @dev: Device to resize
1342 * Read the size of an LBA28 or LBA48 disk with HPA features and resize
1343 * it if required to the full size of the media. The caller must check
1344 * the drive has the HPA feature set enabled.
1347 * 0 on success, -errno on failure.
1349 static int ata_hpa_resize(struct ata_device *dev)
1351 struct ata_eh_context *ehc = &dev->link->eh_context;
1352 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1353 u64 sectors = ata_id_n_sectors(dev->id);
1357 /* do we need to do it? */
1358 if (dev->class != ATA_DEV_ATA ||
1359 !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
1360 (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1363 /* read native max address */
1364 rc = ata_read_native_max_address(dev, &native_sectors);
1366 /* If device aborted the command or HPA isn't going to
1367 * be unlocked, skip HPA resizing.
1369 if (rc == -EACCES || !ata_ignore_hpa) {
1370 ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
1371 "broken, skipping HPA handling\n");
1372 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1374 /* we can continue if device aborted the command */
1382 /* nothing to do? */
1383 if (native_sectors <= sectors || !ata_ignore_hpa) {
1384 if (!print_info || native_sectors == sectors)
1387 if (native_sectors > sectors)
1388 ata_dev_printk(dev, KERN_INFO,
1389 "HPA detected: current %llu, native %llu\n",
1390 (unsigned long long)sectors,
1391 (unsigned long long)native_sectors);
1392 else if (native_sectors < sectors)
1393 ata_dev_printk(dev, KERN_WARNING,
1394 "native sectors (%llu) is smaller than "
1396 (unsigned long long)native_sectors,
1397 (unsigned long long)sectors);
1401 /* let's unlock HPA */
1402 rc = ata_set_max_sectors(dev, native_sectors);
1403 if (rc == -EACCES) {
1404 /* if device aborted the command, skip HPA resizing */
1405 ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
1406 "(%llu -> %llu), skipping HPA handling\n",
1407 (unsigned long long)sectors,
1408 (unsigned long long)native_sectors);
1409 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1414 /* re-read IDENTIFY data */
1415 rc = ata_dev_reread_id(dev, 0);
1417 ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
1418 "data after HPA resizing\n");
1423 u64 new_sectors = ata_id_n_sectors(dev->id);
1424 ata_dev_printk(dev, KERN_INFO,
1425 "HPA unlocked: %llu -> %llu, native %llu\n",
1426 (unsigned long long)sectors,
1427 (unsigned long long)new_sectors,
1428 (unsigned long long)native_sectors);
1435 * ata_noop_dev_select - Select device 0/1 on ATA bus
1436 * @ap: ATA channel to manipulate
1437 * @device: ATA device (numbered from zero) to select
1439 * This function performs no actual function.
1441 * May be used as the dev_select() entry in ata_port_operations.
1446 void ata_noop_dev_select(struct ata_port *ap, unsigned int device)
1451 * ata_dump_id - IDENTIFY DEVICE info debugging output
1452 * @id: IDENTIFY DEVICE page to dump
1454 * Dump selected 16-bit words from the given IDENTIFY DEVICE
1461 static inline void ata_dump_id(const u16 *id)
1463 DPRINTK("49==0x%04x "
1473 DPRINTK("80==0x%04x "
1483 DPRINTK("88==0x%04x "
1490 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1491 * @id: IDENTIFY data to compute xfer mask from
1493 * Compute the xfermask for this device. This is not as trivial
1494 * as it seems if we must consider early devices correctly.
1496 * FIXME: pre IDE drive timing (do we care ?).
1504 unsigned long ata_id_xfermask(const u16 *id)
1506 unsigned long pio_mask, mwdma_mask, udma_mask;
1508 /* Usual case. Word 53 indicates word 64 is valid */
1509 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1510 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1514 /* If word 64 isn't valid then Word 51 high byte holds
1515 * the PIO timing number for the maximum. Turn it into
1518 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1519 if (mode < 5) /* Valid PIO range */
1520 pio_mask = (2 << mode) - 1;
1524 /* But wait.. there's more. Design your standards by
1525 * committee and you too can get a free iordy field to
1526 * process. However its the speeds not the modes that
1527 * are supported... Note drivers using the timing API
1528 * will get this right anyway
1532 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1534 if (ata_id_is_cfa(id)) {
1536 * Process compact flash extended modes
1538 int pio = id[163] & 0x7;
1539 int dma = (id[163] >> 3) & 7;
1542 pio_mask |= (1 << 5);
1544 pio_mask |= (1 << 6);
1546 mwdma_mask |= (1 << 3);
1548 mwdma_mask |= (1 << 4);
1552 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1553 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1555 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1559 * ata_pio_queue_task - Queue port_task
1560 * @ap: The ata_port to queue port_task for
1561 * @fn: workqueue function to be scheduled
1562 * @data: data for @fn to use
1563 * @delay: delay time for workqueue function
1565 * Schedule @fn(@data) for execution after @delay jiffies using
1566 * port_task. There is one port_task per port and it's the
1567 * user(low level driver)'s responsibility to make sure that only
1568 * one task is active at any given time.
1570 * libata core layer takes care of synchronization between
1571 * port_task and EH. ata_pio_queue_task() may be ignored for EH
1575 * Inherited from caller.
1577 void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
1579 ap->port_task_data = data;
1581 /* may fail if ata_port_flush_task() in progress */
1582 queue_delayed_work(ata_wq, &ap->port_task, delay);
1586 * ata_port_flush_task - Flush port_task
1587 * @ap: The ata_port to flush port_task for
1589 * After this function completes, port_task is guranteed not to
1590 * be running or scheduled.
1593 * Kernel thread context (may sleep)
1595 void ata_port_flush_task(struct ata_port *ap)
1599 cancel_rearming_delayed_work(&ap->port_task);
1601 if (ata_msg_ctl(ap))
1602 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
1605 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1607 struct completion *waiting = qc->private_data;
1613 * ata_exec_internal_sg - execute libata internal command
1614 * @dev: Device to which the command is sent
1615 * @tf: Taskfile registers for the command and the result
1616 * @cdb: CDB for packet command
1617 * @dma_dir: Data tranfer direction of the command
1618 * @sgl: sg list for the data buffer of the command
1619 * @n_elem: Number of sg entries
1620 * @timeout: Timeout in msecs (0 for default)
1622 * Executes libata internal command with timeout. @tf contains
1623 * command on entry and result on return. Timeout and error
1624 * conditions are reported via return value. No recovery action
1625 * is taken after a command times out. It's caller's duty to
1626 * clean up after timeout.
1629 * None. Should be called with kernel context, might sleep.
1632 * Zero on success, AC_ERR_* mask on failure
1634 unsigned ata_exec_internal_sg(struct ata_device *dev,
1635 struct ata_taskfile *tf, const u8 *cdb,
1636 int dma_dir, struct scatterlist *sgl,
1637 unsigned int n_elem, unsigned long timeout)
1639 struct ata_link *link = dev->link;
1640 struct ata_port *ap = link->ap;
1641 u8 command = tf->command;
1642 struct ata_queued_cmd *qc;
1643 unsigned int tag, preempted_tag;
1644 u32 preempted_sactive, preempted_qc_active;
1645 int preempted_nr_active_links;
1646 DECLARE_COMPLETION_ONSTACK(wait);
1647 unsigned long flags;
1648 unsigned int err_mask;
1651 spin_lock_irqsave(ap->lock, flags);
1653 /* no internal command while frozen */
1654 if (ap->pflags & ATA_PFLAG_FROZEN) {
1655 spin_unlock_irqrestore(ap->lock, flags);
1656 return AC_ERR_SYSTEM;
1659 /* initialize internal qc */
1661 /* XXX: Tag 0 is used for drivers with legacy EH as some
1662 * drivers choke if any other tag is given. This breaks
1663 * ata_tag_internal() test for those drivers. Don't use new
1664 * EH stuff without converting to it.
1666 if (ap->ops->error_handler)
1667 tag = ATA_TAG_INTERNAL;
1671 if (test_and_set_bit(tag, &ap->qc_allocated))
1673 qc = __ata_qc_from_tag(ap, tag);
1681 preempted_tag = link->active_tag;
1682 preempted_sactive = link->sactive;
1683 preempted_qc_active = ap->qc_active;
1684 preempted_nr_active_links = ap->nr_active_links;
1685 link->active_tag = ATA_TAG_POISON;
1688 ap->nr_active_links = 0;
1690 /* prepare & issue qc */
1693 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1694 qc->flags |= ATA_QCFLAG_RESULT_TF;
1695 qc->dma_dir = dma_dir;
1696 if (dma_dir != DMA_NONE) {
1697 unsigned int i, buflen = 0;
1698 struct scatterlist *sg;
1700 for_each_sg(sgl, sg, n_elem, i)
1701 buflen += sg->length;
1703 ata_sg_init(qc, sgl, n_elem);
1704 qc->nbytes = buflen;
1707 qc->private_data = &wait;
1708 qc->complete_fn = ata_qc_complete_internal;
1712 spin_unlock_irqrestore(ap->lock, flags);
1715 timeout = ata_probe_timeout * 1000 / HZ;
1717 rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1719 ata_port_flush_task(ap);
1722 spin_lock_irqsave(ap->lock, flags);
1724 /* We're racing with irq here. If we lose, the
1725 * following test prevents us from completing the qc
1726 * twice. If we win, the port is frozen and will be
1727 * cleaned up by ->post_internal_cmd().
1729 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1730 qc->err_mask |= AC_ERR_TIMEOUT;
1732 if (ap->ops->error_handler)
1733 ata_port_freeze(ap);
1735 ata_qc_complete(qc);
1737 if (ata_msg_warn(ap))
1738 ata_dev_printk(dev, KERN_WARNING,
1739 "qc timeout (cmd 0x%x)\n", command);
1742 spin_unlock_irqrestore(ap->lock, flags);
1745 /* do post_internal_cmd */
1746 if (ap->ops->post_internal_cmd)
1747 ap->ops->post_internal_cmd(qc);
1749 /* perform minimal error analysis */
1750 if (qc->flags & ATA_QCFLAG_FAILED) {
1751 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1752 qc->err_mask |= AC_ERR_DEV;
1755 qc->err_mask |= AC_ERR_OTHER;
1757 if (qc->err_mask & ~AC_ERR_OTHER)
1758 qc->err_mask &= ~AC_ERR_OTHER;
1762 spin_lock_irqsave(ap->lock, flags);
1764 *tf = qc->result_tf;
1765 err_mask = qc->err_mask;
1768 link->active_tag = preempted_tag;
1769 link->sactive = preempted_sactive;
1770 ap->qc_active = preempted_qc_active;
1771 ap->nr_active_links = preempted_nr_active_links;
1773 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1774 * Until those drivers are fixed, we detect the condition
1775 * here, fail the command with AC_ERR_SYSTEM and reenable the
1778 * Note that this doesn't change any behavior as internal
1779 * command failure results in disabling the device in the
1780 * higher layer for LLDDs without new reset/EH callbacks.
1782 * Kill the following code as soon as those drivers are fixed.
1784 if (ap->flags & ATA_FLAG_DISABLED) {
1785 err_mask |= AC_ERR_SYSTEM;
1789 spin_unlock_irqrestore(ap->lock, flags);
1795 * ata_exec_internal - execute libata internal command
1796 * @dev: Device to which the command is sent
1797 * @tf: Taskfile registers for the command and the result
1798 * @cdb: CDB for packet command
1799 * @dma_dir: Data tranfer direction of the command
1800 * @buf: Data buffer of the command
1801 * @buflen: Length of data buffer
1802 * @timeout: Timeout in msecs (0 for default)
1804 * Wrapper around ata_exec_internal_sg() which takes simple
1805 * buffer instead of sg list.
1808 * None. Should be called with kernel context, might sleep.
1811 * Zero on success, AC_ERR_* mask on failure
1813 unsigned ata_exec_internal(struct ata_device *dev,
1814 struct ata_taskfile *tf, const u8 *cdb,
1815 int dma_dir, void *buf, unsigned int buflen,
1816 unsigned long timeout)
1818 struct scatterlist *psg = NULL, sg;
1819 unsigned int n_elem = 0;
1821 if (dma_dir != DMA_NONE) {
1823 sg_init_one(&sg, buf, buflen);
1828 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
1833 * ata_do_simple_cmd - execute simple internal command
1834 * @dev: Device to which the command is sent
1835 * @cmd: Opcode to execute
1837 * Execute a 'simple' command, that only consists of the opcode
1838 * 'cmd' itself, without filling any other registers
1841 * Kernel thread context (may sleep).
1844 * Zero on success, AC_ERR_* mask on failure
1846 unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1848 struct ata_taskfile tf;
1850 ata_tf_init(dev, &tf);
1853 tf.flags |= ATA_TFLAG_DEVICE;
1854 tf.protocol = ATA_PROT_NODATA;
1856 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1860 * ata_pio_need_iordy - check if iordy needed
1863 * Check if the current speed of the device requires IORDY. Used
1864 * by various controllers for chip configuration.
1867 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1869 /* Controller doesn't support IORDY. Probably a pointless check
1870 as the caller should know this */
1871 if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1873 /* PIO3 and higher it is mandatory */
1874 if (adev->pio_mode > XFER_PIO_2)
1876 /* We turn it on when possible */
1877 if (ata_id_has_iordy(adev->id))
1883 * ata_pio_mask_no_iordy - Return the non IORDY mask
1886 * Compute the highest mode possible if we are not using iordy. Return
1887 * -1 if no iordy mode is available.
1890 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1892 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1893 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1894 u16 pio = adev->id[ATA_ID_EIDE_PIO];
1895 /* Is the speed faster than the drive allows non IORDY ? */
1897 /* This is cycle times not frequency - watch the logic! */
1898 if (pio > 240) /* PIO2 is 240nS per cycle */
1899 return 3 << ATA_SHIFT_PIO;
1900 return 7 << ATA_SHIFT_PIO;
1903 return 3 << ATA_SHIFT_PIO;
1907 * ata_dev_read_id - Read ID data from the specified device
1908 * @dev: target device
1909 * @p_class: pointer to class of the target device (may be changed)
1910 * @flags: ATA_READID_* flags
1911 * @id: buffer to read IDENTIFY data into
1913 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1914 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1915 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1916 * for pre-ATA4 drives.
1918 * FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1919 * now we abort if we hit that case.
1922 * Kernel thread context (may sleep)
1925 * 0 on success, -errno otherwise.
1927 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1928 unsigned int flags, u16 *id)
1930 struct ata_port *ap = dev->link->ap;
1931 unsigned int class = *p_class;
1932 struct ata_taskfile tf;
1933 unsigned int err_mask = 0;
1935 int may_fallback = 1, tried_spinup = 0;
1938 if (ata_msg_ctl(ap))
1939 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
1942 ata_tf_init(dev, &tf);
1946 tf.command = ATA_CMD_ID_ATA;
1949 tf.command = ATA_CMD_ID_ATAPI;
1953 reason = "unsupported class";
1957 tf.protocol = ATA_PROT_PIO;
1959 /* Some devices choke if TF registers contain garbage. Make
1960 * sure those are properly initialized.
1962 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1964 /* Device presence detection is unreliable on some
1965 * controllers. Always poll IDENTIFY if available.
1967 tf.flags |= ATA_TFLAG_POLLING;
1969 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1970 id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1972 if (err_mask & AC_ERR_NODEV_HINT) {
1973 ata_dev_printk(dev, KERN_DEBUG,
1974 "NODEV after polling detection\n");
1978 if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
1979 /* Device or controller might have reported
1980 * the wrong device class. Give a shot at the
1981 * other IDENTIFY if the current one is
1982 * aborted by the device.
1987 if (class == ATA_DEV_ATA)
1988 class = ATA_DEV_ATAPI;
1990 class = ATA_DEV_ATA;
1994 /* Control reaches here iff the device aborted
1995 * both flavors of IDENTIFYs which happens
1996 * sometimes with phantom devices.
1998 ata_dev_printk(dev, KERN_DEBUG,
1999 "both IDENTIFYs aborted, assuming NODEV\n");
2004 reason = "I/O error";
2008 /* Falling back doesn't make sense if ID data was read
2009 * successfully at least once.
2013 swap_buf_le16(id, ATA_ID_WORDS);
2017 reason = "device reports invalid type";
2019 if (class == ATA_DEV_ATA) {
2020 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
2023 if (ata_id_is_ata(id))
2027 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
2030 * Drive powered-up in standby mode, and requires a specific
2031 * SET_FEATURES spin-up subcommand before it will accept
2032 * anything other than the original IDENTIFY command.
2034 err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2035 if (err_mask && id[2] != 0x738c) {
2037 reason = "SPINUP failed";
2041 * If the drive initially returned incomplete IDENTIFY info,
2042 * we now must reissue the IDENTIFY command.
2044 if (id[2] == 0x37c8)
2048 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2050 * The exact sequence expected by certain pre-ATA4 drives is:
2052 * IDENTIFY (optional in early ATA)
2053 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2055 * Some drives were very specific about that exact sequence.
2057 * Note that ATA4 says lba is mandatory so the second check
2058 * shoud never trigger.
2060 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
2061 err_mask = ata_dev_init_params(dev, id[3], id[6]);
2064 reason = "INIT_DEV_PARAMS failed";
2068 /* current CHS translation info (id[53-58]) might be
2069 * changed. reread the identify device info.
2071 flags &= ~ATA_READID_POSTRESET;
2081 if (ata_msg_warn(ap))
2082 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
2083 "(%s, err_mask=0x%x)\n", reason, err_mask);
2087 static inline u8 ata_dev_knobble(struct ata_device *dev)
2089 struct ata_port *ap = dev->link->ap;
2090 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2093 static void ata_dev_config_ncq(struct ata_device *dev,
2094 char *desc, size_t desc_sz)
2096 struct ata_port *ap = dev->link->ap;
2097 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2099 if (!ata_id_has_ncq(dev->id)) {
2103 if (dev->horkage & ATA_HORKAGE_NONCQ) {
2104 snprintf(desc, desc_sz, "NCQ (not used)");
2107 if (ap->flags & ATA_FLAG_NCQ) {
2108 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2109 dev->flags |= ATA_DFLAG_NCQ;
2112 if (hdepth >= ddepth)
2113 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
2115 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
2119 * ata_dev_configure - Configure the specified ATA/ATAPI device
2120 * @dev: Target device to configure
2122 * Configure @dev according to @dev->id. Generic and low-level
2123 * driver specific fixups are also applied.
2126 * Kernel thread context (may sleep)
2129 * 0 on success, -errno otherwise
2131 int ata_dev_configure(struct ata_device *dev)
2133 struct ata_port *ap = dev->link->ap;
2134 struct ata_eh_context *ehc = &dev->link->eh_context;
2135 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2136 const u16 *id = dev->id;
2137 unsigned long xfer_mask;
2138 char revbuf[7]; /* XYZ-99\0 */
2139 char fwrevbuf[ATA_ID_FW_REV_LEN+1];
2140 char modelbuf[ATA_ID_PROD_LEN+1];
2143 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2144 ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2149 if (ata_msg_probe(ap))
2150 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
2153 dev->horkage |= ata_dev_blacklisted(dev);
2154 ata_force_horkage(dev);
2156 /* let ACPI work its magic */
2157 rc = ata_acpi_on_devcfg(dev);
2161 /* massage HPA, do it early as it might change IDENTIFY data */
2162 rc = ata_hpa_resize(dev);
2166 /* print device capabilities */
2167 if (ata_msg_probe(ap))
2168 ata_dev_printk(dev, KERN_DEBUG,
2169 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
2170 "85:%04x 86:%04x 87:%04x 88:%04x\n",
2172 id[49], id[82], id[83], id[84],
2173 id[85], id[86], id[87], id[88]);
2175 /* initialize to-be-configured parameters */
2176 dev->flags &= ~ATA_DFLAG_CFG_MASK;
2177 dev->max_sectors = 0;
2185 * common ATA, ATAPI feature tests
2188 /* find max transfer mode; for printk only */
2189 xfer_mask = ata_id_xfermask(id);
2191 if (ata_msg_probe(ap))
2194 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
2195 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
2198 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
2201 /* ATA-specific feature tests */
2202 if (dev->class == ATA_DEV_ATA) {
2203 if (ata_id_is_cfa(id)) {
2204 if (id[162] & 1) /* CPRM may make this media unusable */
2205 ata_dev_printk(dev, KERN_WARNING,
2206 "supports DRM functions and may "
2207 "not be fully accessable.\n");
2208 snprintf(revbuf, 7, "CFA");
2210 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2211 /* Warn the user if the device has TPM extensions */
2212 if (ata_id_has_tpm(id))
2213 ata_dev_printk(dev, KERN_WARNING,
2214 "supports DRM functions and may "
2215 "not be fully accessable.\n");
2218 dev->n_sectors = ata_id_n_sectors(id);
2220 if (dev->id[59] & 0x100)
2221 dev->multi_count = dev->id[59] & 0xff;
2223 if (ata_id_has_lba(id)) {
2224 const char *lba_desc;
2228 dev->flags |= ATA_DFLAG_LBA;
2229 if (ata_id_has_lba48(id)) {
2230 dev->flags |= ATA_DFLAG_LBA48;
2233 if (dev->n_sectors >= (1UL << 28) &&
2234 ata_id_has_flush_ext(id))
2235 dev->flags |= ATA_DFLAG_FLUSH_EXT;
2239 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
2241 /* print device info to dmesg */
2242 if (ata_msg_drv(ap) && print_info) {
2243 ata_dev_printk(dev, KERN_INFO,
2244 "%s: %s, %s, max %s\n",
2245 revbuf, modelbuf, fwrevbuf,
2246 ata_mode_string(xfer_mask));
2247 ata_dev_printk(dev, KERN_INFO,
2248 "%Lu sectors, multi %u: %s %s\n",
2249 (unsigned long long)dev->n_sectors,
2250 dev->multi_count, lba_desc, ncq_desc);
2255 /* Default translation */
2256 dev->cylinders = id[1];
2258 dev->sectors = id[6];
2260 if (ata_id_current_chs_valid(id)) {
2261 /* Current CHS translation is valid. */
2262 dev->cylinders = id[54];
2263 dev->heads = id[55];
2264 dev->sectors = id[56];
2267 /* print device info to dmesg */
2268 if (ata_msg_drv(ap) && print_info) {
2269 ata_dev_printk(dev, KERN_INFO,
2270 "%s: %s, %s, max %s\n",
2271 revbuf, modelbuf, fwrevbuf,
2272 ata_mode_string(xfer_mask));
2273 ata_dev_printk(dev, KERN_INFO,
2274 "%Lu sectors, multi %u, CHS %u/%u/%u\n",
2275 (unsigned long long)dev->n_sectors,
2276 dev->multi_count, dev->cylinders,
2277 dev->heads, dev->sectors);
2284 /* ATAPI-specific feature tests */
2285 else if (dev->class == ATA_DEV_ATAPI) {
2286 const char *cdb_intr_string = "";
2287 const char *atapi_an_string = "";
2288 const char *dma_dir_string = "";
2291 rc = atapi_cdb_len(id);
2292 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2293 if (ata_msg_warn(ap))
2294 ata_dev_printk(dev, KERN_WARNING,
2295 "unsupported CDB len\n");
2299 dev->cdb_len = (unsigned int) rc;
2301 /* Enable ATAPI AN if both the host and device have
2302 * the support. If PMP is attached, SNTF is required
2303 * to enable ATAPI AN to discern between PHY status
2304 * changed notifications and ATAPI ANs.
2306 if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
2307 (!ap->nr_pmp_links ||
2308 sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2309 unsigned int err_mask;
2311 /* issue SET feature command to turn this on */
2312 err_mask = ata_dev_set_feature(dev,
2313 SETFEATURES_SATA_ENABLE, SATA_AN);
2315 ata_dev_printk(dev, KERN_ERR,
2316 "failed to enable ATAPI AN "
2317 "(err_mask=0x%x)\n", err_mask);
2319 dev->flags |= ATA_DFLAG_AN;
2320 atapi_an_string = ", ATAPI AN";
2324 if (ata_id_cdb_intr(dev->id)) {
2325 dev->flags |= ATA_DFLAG_CDB_INTR;
2326 cdb_intr_string = ", CDB intr";
2329 if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
2330 dev->flags |= ATA_DFLAG_DMADIR;
2331 dma_dir_string = ", DMADIR";
2334 /* print device info to dmesg */
2335 if (ata_msg_drv(ap) && print_info)
2336 ata_dev_printk(dev, KERN_INFO,
2337 "ATAPI: %s, %s, max %s%s%s%s\n",
2339 ata_mode_string(xfer_mask),
2340 cdb_intr_string, atapi_an_string,
2344 /* determine max_sectors */
2345 dev->max_sectors = ATA_MAX_SECTORS;
2346 if (dev->flags & ATA_DFLAG_LBA48)
2347 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2349 if (!(dev->horkage & ATA_HORKAGE_IPM)) {
2350 if (ata_id_has_hipm(dev->id))
2351 dev->flags |= ATA_DFLAG_HIPM;
2352 if (ata_id_has_dipm(dev->id))
2353 dev->flags |= ATA_DFLAG_DIPM;
2356 /* Limit PATA drive on SATA cable bridge transfers to udma5,
2358 if (ata_dev_knobble(dev)) {
2359 if (ata_msg_drv(ap) && print_info)
2360 ata_dev_printk(dev, KERN_INFO,
2361 "applying bridge limits\n");
2362 dev->udma_mask &= ATA_UDMA5;
2363 dev->max_sectors = ATA_MAX_SECTORS;
2366 if ((dev->class == ATA_DEV_ATAPI) &&
2367 (atapi_command_packet_set(id) == TYPE_TAPE)) {
2368 dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2369 dev->horkage |= ATA_HORKAGE_STUCK_ERR;
2372 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2373 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2376 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
2377 dev->horkage |= ATA_HORKAGE_IPM;
2379 /* reset link pm_policy for this port to no pm */
2380 ap->pm_policy = MAX_PERFORMANCE;
2383 if (ap->ops->dev_config)
2384 ap->ops->dev_config(dev);
2386 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2387 /* Let the user know. We don't want to disallow opens for
2388 rescue purposes, or in case the vendor is just a blithering
2389 idiot. Do this after the dev_config call as some controllers
2390 with buggy firmware may want to avoid reporting false device
2394 ata_dev_printk(dev, KERN_WARNING,
2395 "Drive reports diagnostics failure. This may indicate a drive\n");
2396 ata_dev_printk(dev, KERN_WARNING,
2397 "fault or invalid emulation. Contact drive vendor for information.\n");
2404 if (ata_msg_probe(ap))
2405 ata_dev_printk(dev, KERN_DEBUG,
2406 "%s: EXIT, err\n", __func__);
2411 * ata_cable_40wire - return 40 wire cable type
2414 * Helper method for drivers which want to hardwire 40 wire cable
2418 int ata_cable_40wire(struct ata_port *ap)
2420 return ATA_CBL_PATA40;
2424 * ata_cable_80wire - return 80 wire cable type
2427 * Helper method for drivers which want to hardwire 80 wire cable
2431 int ata_cable_80wire(struct ata_port *ap)
2433 return ATA_CBL_PATA80;
2437 * ata_cable_unknown - return unknown PATA cable.
2440 * Helper method for drivers which have no PATA cable detection.
2443 int ata_cable_unknown(struct ata_port *ap)
2445 return ATA_CBL_PATA_UNK;
2449 * ata_cable_ignore - return ignored PATA cable.
2452 * Helper method for drivers which don't use cable type to limit
2455 int ata_cable_ignore(struct ata_port *ap)
2457 return ATA_CBL_PATA_IGN;
2461 * ata_cable_sata - return SATA cable type
2464 * Helper method for drivers which have SATA cables
2467 int ata_cable_sata(struct ata_port *ap)
2469 return ATA_CBL_SATA;
2473 * ata_bus_probe - Reset and probe ATA bus
2476 * Master ATA bus probing function. Initiates a hardware-dependent
2477 * bus reset, then attempts to identify any devices found on
2481 * PCI/etc. bus probe sem.
2484 * Zero on success, negative errno otherwise.
2487 int ata_bus_probe(struct ata_port *ap)
2489 unsigned int classes[ATA_MAX_DEVICES];
2490 int tries[ATA_MAX_DEVICES];
2492 struct ata_device *dev;
2496 ata_link_for_each_dev(dev, &ap->link)
2497 tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2500 ata_link_for_each_dev(dev, &ap->link) {
2501 /* If we issue an SRST then an ATA drive (not ATAPI)
2502 * may change configuration and be in PIO0 timing. If
2503 * we do a hard reset (or are coming from power on)
2504 * this is true for ATA or ATAPI. Until we've set a
2505 * suitable controller mode we should not touch the
2506 * bus as we may be talking too fast.
2508 dev->pio_mode = XFER_PIO_0;
2510 /* If the controller has a pio mode setup function
2511 * then use it to set the chipset to rights. Don't
2512 * touch the DMA setup as that will be dealt with when
2513 * configuring devices.
2515 if (ap->ops->set_piomode)
2516 ap->ops->set_piomode(ap, dev);
2519 /* reset and determine device classes */
2520 ap->ops->phy_reset(ap);
2522 ata_link_for_each_dev(dev, &ap->link) {
2523 if (!(ap->flags & ATA_FLAG_DISABLED) &&
2524 dev->class != ATA_DEV_UNKNOWN)
2525 classes[dev->devno] = dev->class;
2527 classes[dev->devno] = ATA_DEV_NONE;
2529 dev->class = ATA_DEV_UNKNOWN;
2534 /* read IDENTIFY page and configure devices. We have to do the identify
2535 specific sequence bass-ackwards so that PDIAG- is released by
2538 ata_link_for_each_dev_reverse(dev, &ap->link) {
2539 if (tries[dev->devno])
2540 dev->class = classes[dev->devno];
2542 if (!ata_dev_enabled(dev))
2545 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2551 /* Now ask for the cable type as PDIAG- should have been released */
2552 if (ap->ops->cable_detect)
2553 ap->cbl = ap->ops->cable_detect(ap);
2555 /* We may have SATA bridge glue hiding here irrespective of the
2556 reported cable types and sensed types */
2557 ata_link_for_each_dev(dev, &ap->link) {
2558 if (!ata_dev_enabled(dev))
2560 /* SATA drives indicate we have a bridge. We don't know which
2561 end of the link the bridge is which is a problem */
2562 if (ata_id_is_sata(dev->id))
2563 ap->cbl = ATA_CBL_SATA;
2566 /* After the identify sequence we can now set up the devices. We do
2567 this in the normal order so that the user doesn't get confused */
2569 ata_link_for_each_dev(dev, &ap->link) {
2570 if (!ata_dev_enabled(dev))
2573 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2574 rc = ata_dev_configure(dev);
2575 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2580 /* configure transfer mode */
2581 rc = ata_set_mode(&ap->link, &dev);
2585 ata_link_for_each_dev(dev, &ap->link)
2586 if (ata_dev_enabled(dev))
2589 /* no device present, disable port */
2590 ata_port_disable(ap);
2594 tries[dev->devno]--;
2598 /* eeek, something went very wrong, give up */
2599 tries[dev->devno] = 0;
2603 /* give it just one more chance */
2604 tries[dev->devno] = min(tries[dev->devno], 1);
2606 if (tries[dev->devno] == 1) {
2607 /* This is the last chance, better to slow
2608 * down than lose it.
2610 sata_down_spd_limit(&ap->link);
2611 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2615 if (!tries[dev->devno])
2616 ata_dev_disable(dev);
2622 * ata_port_probe - Mark port as enabled
2623 * @ap: Port for which we indicate enablement
2625 * Modify @ap data structure such that the system
2626 * thinks that the entire port is enabled.
2628 * LOCKING: host lock, or some other form of
2632 void ata_port_probe(struct ata_port *ap)
2634 ap->flags &= ~ATA_FLAG_DISABLED;
2638 * sata_print_link_status - Print SATA link status
2639 * @link: SATA link to printk link status about
2641 * This function prints link speed and status of a SATA link.
2646 void sata_print_link_status(struct ata_link *link)
2648 u32 sstatus, scontrol, tmp;
2650 if (sata_scr_read(link, SCR_STATUS, &sstatus))
2652 sata_scr_read(link, SCR_CONTROL, &scontrol);
2654 if (ata_link_online(link)) {
2655 tmp = (sstatus >> 4) & 0xf;
2656 ata_link_printk(link, KERN_INFO,
2657 "SATA link up %s (SStatus %X SControl %X)\n",
2658 sata_spd_string(tmp), sstatus, scontrol);
2660 ata_link_printk(link, KERN_INFO,
2661 "SATA link down (SStatus %X SControl %X)\n",
2667 * ata_dev_pair - return other device on cable
2670 * Obtain the other device on the same cable, or if none is
2671 * present NULL is returned
2674 struct ata_device *ata_dev_pair(struct ata_device *adev)
2676 struct ata_link *link = adev->link;
2677 struct ata_device *pair = &link->device[1 - adev->devno];
2678 if (!ata_dev_enabled(pair))
2684 * ata_port_disable - Disable port.
2685 * @ap: Port to be disabled.
2687 * Modify @ap data structure such that the system
2688 * thinks that the entire port is disabled, and should
2689 * never attempt to probe or communicate with devices
2692 * LOCKING: host lock, or some other form of
2696 void ata_port_disable(struct ata_port *ap)
2698 ap->link.device[0].class = ATA_DEV_NONE;
2699 ap->link.device[1].class = ATA_DEV_NONE;
2700 ap->flags |= ATA_FLAG_DISABLED;
2704 * sata_down_spd_limit - adjust SATA spd limit downward
2705 * @link: Link to adjust SATA spd limit for
2707 * Adjust SATA spd limit of @link downward. Note that this
2708 * function only adjusts the limit. The change must be applied
2709 * using sata_set_spd().
2712 * Inherited from caller.
2715 * 0 on success, negative errno on failure
2717 int sata_down_spd_limit(struct ata_link *link)
2719 u32 sstatus, spd, mask;
2722 if (!sata_scr_valid(link))
2725 /* If SCR can be read, use it to determine the current SPD.
2726 * If not, use cached value in link->sata_spd.
2728 rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2730 spd = (sstatus >> 4) & 0xf;
2732 spd = link->sata_spd;
2734 mask = link->sata_spd_limit;
2738 /* unconditionally mask off the highest bit */
2739 highbit = fls(mask) - 1;
2740 mask &= ~(1 << highbit);
2742 /* Mask off all speeds higher than or equal to the current
2743 * one. Force 1.5Gbps if current SPD is not available.
2746 mask &= (1 << (spd - 1)) - 1;
2750 /* were we already at the bottom? */
2754 link->sata_spd_limit = mask;
2756 ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2757 sata_spd_string(fls(mask)));
2762 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2764 struct ata_link *host_link = &link->ap->link;
2765 u32 limit, target, spd;
2767 limit = link->sata_spd_limit;
2769 /* Don't configure downstream link faster than upstream link.
2770 * It doesn't speed up anything and some PMPs choke on such
2773 if (!ata_is_host_link(link) && host_link->sata_spd)
2774 limit &= (1 << host_link->sata_spd) - 1;
2776 if (limit == UINT_MAX)
2779 target = fls(limit);
2781 spd = (*scontrol >> 4) & 0xf;
2782 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2784 return spd != target;
2788 * sata_set_spd_needed - is SATA spd configuration needed
2789 * @link: Link in question
2791 * Test whether the spd limit in SControl matches
2792 * @link->sata_spd_limit. This function is used to determine
2793 * whether hardreset is necessary to apply SATA spd
2797 * Inherited from caller.
2800 * 1 if SATA spd configuration is needed, 0 otherwise.
2802 int sata_set_spd_needed(struct ata_link *link)
2806 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2809 return __sata_set_spd_needed(link, &scontrol);
2813 * sata_set_spd - set SATA spd according to spd limit
2814 * @link: Link to set SATA spd for
2816 * Set SATA spd of @link according to sata_spd_limit.
2819 * Inherited from caller.
2822 * 0 if spd doesn't need to be changed, 1 if spd has been
2823 * changed. Negative errno if SCR registers are inaccessible.
2825 int sata_set_spd(struct ata_link *link)
2830 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2833 if (!__sata_set_spd_needed(link, &scontrol))
2836 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2843 * This mode timing computation functionality is ported over from
2844 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
2847 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
2848 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2849 * for UDMA6, which is currently supported only by Maxtor drives.
2851 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
2854 static const struct ata_timing ata_timing[] = {
2855 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
2856 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
2857 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
2858 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
2859 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
2860 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
2861 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
2862 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
2864 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
2865 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
2866 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
2868 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
2869 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
2870 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
2871 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 },
2872 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
2874 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
2875 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
2876 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
2877 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
2878 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
2879 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
2880 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
2881 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
2886 #define ENOUGH(v, unit) (((v)-1)/(unit)+1)
2887 #define EZ(v, unit) ((v)?ENOUGH(v, unit):0)
2889 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
2891 q->setup = EZ(t->setup * 1000, T);
2892 q->act8b = EZ(t->act8b * 1000, T);
2893 q->rec8b = EZ(t->rec8b * 1000, T);
2894 q->cyc8b = EZ(t->cyc8b * 1000, T);
2895 q->active = EZ(t->active * 1000, T);
2896 q->recover = EZ(t->recover * 1000, T);
2897 q->cycle = EZ(t->cycle * 1000, T);
2898 q->udma = EZ(t->udma * 1000, UT);
2901 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
2902 struct ata_timing *m, unsigned int what)
2904 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
2905 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
2906 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
2907 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
2908 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
2909 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
2910 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
2911 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
2914 const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
2916 const struct ata_timing *t = ata_timing;
2918 while (xfer_mode > t->mode)
2921 if (xfer_mode == t->mode)
2926 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
2927 struct ata_timing *t, int T, int UT)
2929 const struct ata_timing *s;
2930 struct ata_timing p;
2936 if (!(s = ata_timing_find_mode(speed)))
2939 memcpy(t, s, sizeof(*s));
2942 * If the drive is an EIDE drive, it can tell us it needs extended
2943 * PIO/MW_DMA cycle timing.
2946 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
2947 memset(&p, 0, sizeof(p));
2948 if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
2949 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
2950 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
2951 } else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
2952 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
2954 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
2958 * Convert the timing to bus clock counts.
2961 ata_timing_quantize(t, t, T, UT);
2964 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2965 * S.M.A.R.T * and some other commands. We have to ensure that the
2966 * DMA cycle timing is slower/equal than the fastest PIO timing.
2969 if (speed > XFER_PIO_6) {
2970 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
2971 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
2975 * Lengthen active & recovery time so that cycle time is correct.
2978 if (t->act8b + t->rec8b < t->cyc8b) {
2979 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
2980 t->rec8b = t->cyc8b - t->act8b;
2983 if (t->active + t->recover < t->cycle) {
2984 t->active += (t->cycle - (t->active + t->recover)) / 2;
2985 t->recover = t->cycle - t->active;
2988 /* In a few cases quantisation may produce enough errors to
2989 leave t->cycle too low for the sum of active and recovery
2990 if so we must correct this */
2991 if (t->active + t->recover > t->cycle)
2992 t->cycle = t->active + t->recover;
2998 * ata_timing_cycle2mode - find xfer mode for the specified cycle duration
2999 * @xfer_shift: ATA_SHIFT_* value for transfer type to examine.
3000 * @cycle: cycle duration in ns
3002 * Return matching xfer mode for @cycle. The returned mode is of
3003 * the transfer type specified by @xfer_shift. If @cycle is too
3004 * slow for @xfer_shift, 0xff is returned. If @cycle is faster
3005 * than the fastest known mode, the fasted mode is returned.
3011 * Matching xfer_mode, 0xff if no match found.
3013 u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
3015 u8 base_mode = 0xff, last_mode = 0xff;
3016 const struct ata_xfer_ent *ent;
3017 const struct ata_timing *t;
3019 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
3020 if (ent->shift == xfer_shift)
3021 base_mode = ent->base;
3023 for (t = ata_timing_find_mode(base_mode);
3024 t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
3025 unsigned short this_cycle;
3027 switch (xfer_shift) {
3029 case ATA_SHIFT_MWDMA:
3030 this_cycle = t->cycle;
3032 case ATA_SHIFT_UDMA:
3033 this_cycle = t->udma;
3039 if (cycle > this_cycle)
3042 last_mode = t->mode;
3049 * ata_down_xfermask_limit - adjust dev xfer masks downward
3050 * @dev: Device to adjust xfer masks
3051 * @sel: ATA_DNXFER_* selector
3053 * Adjust xfer masks of @dev downward. Note that this function
3054 * does not apply the change. Invoking ata_set_mode() afterwards
3055 * will apply the limit.
3058 * Inherited from caller.
3061 * 0 on success, negative errno on failure
3063 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3066 unsigned long orig_mask, xfer_mask;
3067 unsigned long pio_mask, mwdma_mask, udma_mask;
3070 quiet = !!(sel & ATA_DNXFER_QUIET);
3071 sel &= ~ATA_DNXFER_QUIET;
3073 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
3076 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
3079 case ATA_DNXFER_PIO:
3080 highbit = fls(pio_mask) - 1;
3081 pio_mask &= ~(1 << highbit);
3084 case ATA_DNXFER_DMA:
3086 highbit = fls(udma_mask) - 1;
3087 udma_mask &= ~(1 << highbit);
3090 } else if (mwdma_mask) {
3091 highbit = fls(mwdma_mask) - 1;
3092 mwdma_mask &= ~(1 << highbit);
3098 case ATA_DNXFER_40C:
3099 udma_mask &= ATA_UDMA_MASK_40C;
3102 case ATA_DNXFER_FORCE_PIO0:
3104 case ATA_DNXFER_FORCE_PIO:
3113 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
3115 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
3119 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
3120 snprintf(buf, sizeof(buf), "%s:%s",
3121 ata_mode_string(xfer_mask),
3122 ata_mode_string(xfer_mask & ATA_MASK_PIO));
3124 snprintf(buf, sizeof(buf), "%s",
3125 ata_mode_string(xfer_mask));
3127 ata_dev_printk(dev, KERN_WARNING,
3128 "limiting speed to %s\n", buf);
3131 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
3137 static int ata_dev_set_mode(struct ata_device *dev)
3139 struct ata_eh_context *ehc = &dev->link->eh_context;
3140 const char *dev_err_whine = "";
3141 int ign_dev_err = 0;
3142 unsigned int err_mask;
3145 dev->flags &= ~ATA_DFLAG_PIO;
3146 if (dev->xfer_shift == ATA_SHIFT_PIO)
3147 dev->flags |= ATA_DFLAG_PIO;
3149 err_mask = ata_dev_set_xfermode(dev);
3151 if (err_mask & ~AC_ERR_DEV)
3155 ehc->i.flags |= ATA_EHI_POST_SETMODE;
3156 rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3157 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3161 /* Old CFA may refuse this command, which is just fine */
3162 if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
3165 /* Some very old devices and some bad newer ones fail any kind of
3166 SET_XFERMODE request but support PIO0-2 timings and no IORDY */
3167 if (dev->xfer_shift == ATA_SHIFT_PIO && !ata_id_has_iordy(dev->id) &&
3168 dev->pio_mode <= XFER_PIO_2)
3171 /* Early MWDMA devices do DMA but don't allow DMA mode setting.
3172 Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3173 if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3174 dev->dma_mode == XFER_MW_DMA_0 &&
3175 (dev->id[63] >> 8) & 1)
3178 /* if the device is actually configured correctly, ignore dev err */
3179 if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
3182 if (err_mask & AC_ERR_DEV) {
3186 dev_err_whine = " (device error ignored)";
3189 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
3190 dev->xfer_shift, (int)dev->xfer_mode);
3192 ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
3193 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
3199 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
3200 "(err_mask=0x%x)\n", err_mask);
3205 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3206 * @link: link on which timings will be programmed
3207 * @r_failed_dev: out parameter for failed device
3209 * Standard implementation of the function used to tune and set
3210 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3211 * ata_dev_set_mode() fails, pointer to the failing device is
3212 * returned in @r_failed_dev.
3215 * PCI/etc. bus probe sem.
3218 * 0 on success, negative errno otherwise
3221 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3223 struct ata_port *ap = link->ap;
3224 struct ata_device *dev;
3225 int rc = 0, used_dma = 0, found = 0;
3227 /* step 1: calculate xfer_mask */
3228 ata_link_for_each_dev(dev, link) {
3229 unsigned long pio_mask, dma_mask;
3230 unsigned int mode_mask;
3232 if (!ata_dev_enabled(dev))
3235 mode_mask = ATA_DMA_MASK_ATA;
3236 if (dev->class == ATA_DEV_ATAPI)
3237 mode_mask = ATA_DMA_MASK_ATAPI;
3238 else if (ata_id_is_cfa(dev->id))
3239 mode_mask = ATA_DMA_MASK_CFA;
3241 ata_dev_xfermask(dev);
3242 ata_force_xfermask(dev);
3244 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3245 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3247 if (libata_dma_mask & mode_mask)
3248 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3252 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
3253 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3256 if (dev->dma_mode != 0xff)
3262 /* step 2: always set host PIO timings */
3263 ata_link_for_each_dev(dev, link) {
3264 if (!ata_dev_enabled(dev))
3267 if (dev->pio_mode == 0xff) {
3268 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3273 dev->xfer_mode = dev->pio_mode;
3274 dev->xfer_shift = ATA_SHIFT_PIO;
3275 if (ap->ops->set_piomode)
3276 ap->ops->set_piomode(ap, dev);
3279 /* step 3: set host DMA timings */
3280 ata_link_for_each_dev(dev, link) {
3281 if (!ata_dev_enabled(dev) || dev->dma_mode == 0xff)
3284 dev->xfer_mode = dev->dma_mode;
3285 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
3286 if (ap->ops->set_dmamode)
3287 ap->ops->set_dmamode(ap, dev);
3290 /* step 4: update devices' xfer mode */
3291 ata_link_for_each_dev(dev, link) {
3292 /* don't update suspended devices' xfer mode */
3293 if (!ata_dev_enabled(dev))
3296 rc = ata_dev_set_mode(dev);
3301 /* Record simplex status. If we selected DMA then the other
3302 * host channels are not permitted to do so.
3304 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
3305 ap->host->simplex_claimed = ap;
3309 *r_failed_dev = dev;
3314 * ata_wait_ready - wait for link to become ready
3315 * @link: link to be waited on
3316 * @deadline: deadline jiffies for the operation
3317 * @check_ready: callback to check link readiness
3319 * Wait for @link to become ready. @check_ready should return
3320 * positive number if @link is ready, 0 if it isn't, -ENODEV if
3321 * link doesn't seem to be occupied, other errno for other error
3324 * Transient -ENODEV conditions are allowed for
3325 * ATA_TMOUT_FF_WAIT.
3331 * 0 if @linke is ready before @deadline; otherwise, -errno.
3333 int ata_wait_ready(struct ata_link *link, unsigned long deadline,
3334 int (*check_ready)(struct ata_link *link))
3336 unsigned long start = jiffies;
3337 unsigned long nodev_deadline = start + ATA_TMOUT_FF_WAIT;
3340 if (time_after(nodev_deadline, deadline))
3341 nodev_deadline = deadline;
3344 unsigned long now = jiffies;
3347 ready = tmp = check_ready(link);
3351 /* -ENODEV could be transient. Ignore -ENODEV if link
3352 * is online. Also, some SATA devices take a long
3353 * time to clear 0xff after reset. For example,
3354 * HHD424020F7SV00 iVDR needs >= 800ms while Quantum
3355 * GoVault needs even more than that. Wait for
3356 * ATA_TMOUT_FF_WAIT on -ENODEV if link isn't offline.
3358 * Note that some PATA controllers (pata_ali) explode
3359 * if status register is read more than once when
3360 * there's no device attached.
3362 if (ready == -ENODEV) {
3363 if (ata_link_online(link))
3365 else if ((link->ap->flags & ATA_FLAG_SATA) &&
3366 !ata_link_offline(link) &&
3367 time_before(now, nodev_deadline))
3373 if (time_after(now, deadline))
3376 if (!warned && time_after(now, start + 5 * HZ) &&
3377 (deadline - now > 3 * HZ)) {
3378 ata_link_printk(link, KERN_WARNING,
3379 "link is slow to respond, please be patient "
3380 "(ready=%d)\n", tmp);
3389 * ata_wait_after_reset - wait for link to become ready after reset
3390 * @link: link to be waited on
3391 * @deadline: deadline jiffies for the operation
3392 * @check_ready: callback to check link readiness
3394 * Wait for @link to become ready after reset.
3400 * 0 if @linke is ready before @deadline; otherwise, -errno.
3402 extern int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3403 int (*check_ready)(struct ata_link *link))
3405 msleep(ATA_WAIT_AFTER_RESET_MSECS);
3407 return ata_wait_ready(link, deadline, check_ready);
3411 * sata_link_debounce - debounce SATA phy status
3412 * @link: ATA link to debounce SATA phy status for
3413 * @params: timing parameters { interval, duratinon, timeout } in msec
3414 * @deadline: deadline jiffies for the operation
3416 * Make sure SStatus of @link reaches stable state, determined by
3417 * holding the same value where DET is not 1 for @duration polled
3418 * every @interval, before @timeout. Timeout constraints the
3419 * beginning of the stable state. Because DET gets stuck at 1 on
3420 * some controllers after hot unplugging, this functions waits
3421 * until timeout then returns 0 if DET is stable at 1.
3423 * @timeout is further limited by @deadline. The sooner of the
3427 * Kernel thread context (may sleep)
3430 * 0 on success, -errno on failure.
3432 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3433 unsigned long deadline)
3435 unsigned long interval_msec = params[0];
3436 unsigned long duration = msecs_to_jiffies(params[1]);
3437 unsigned long last_jiffies, t;
3441 t = jiffies + msecs_to_jiffies(params[2]);
3442 if (time_before(t, deadline))
3445 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3450 last_jiffies = jiffies;
3453 msleep(interval_msec);
3454 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3460 if (cur == 1 && time_before(jiffies, deadline))
3462 if (time_after(jiffies, last_jiffies + duration))
3467 /* unstable, start over */
3469 last_jiffies = jiffies;
3471 /* Check deadline. If debouncing failed, return
3472 * -EPIPE to tell upper layer to lower link speed.
3474 if (time_after(jiffies, deadline))
3480 * sata_link_resume - resume SATA link
3481 * @link: ATA link to resume SATA
3482 * @params: timing parameters { interval, duratinon, timeout } in msec
3483 * @deadline: deadline jiffies for the operation
3485 * Resume SATA phy @link and debounce it.
3488 * Kernel thread context (may sleep)
3491 * 0 on success, -errno on failure.
3493 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3494 unsigned long deadline)
3499 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3502 scontrol = (scontrol & 0x0f0) | 0x300;
3504 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3507 /* Some PHYs react badly if SStatus is pounded immediately
3508 * after resuming. Delay 200ms before debouncing.
3512 return sata_link_debounce(link, params, deadline);
3516 * ata_std_prereset - prepare for reset
3517 * @link: ATA link to be reset
3518 * @deadline: deadline jiffies for the operation
3520 * @link is about to be reset. Initialize it. Failure from
3521 * prereset makes libata abort whole reset sequence and give up
3522 * that port, so prereset should be best-effort. It does its
3523 * best to prepare for reset sequence but if things go wrong, it
3524 * should just whine, not fail.
3527 * Kernel thread context (may sleep)
3530 * 0 on success, -errno otherwise.
3532 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3534 struct ata_port *ap = link->ap;
3535 struct ata_eh_context *ehc = &link->eh_context;
3536 const unsigned long *timing = sata_ehc_deb_timing(ehc);
3539 /* if we're about to do hardreset, nothing more to do */
3540 if (ehc->i.action & ATA_EH_HARDRESET)
3543 /* if SATA, resume link */
3544 if (ap->flags & ATA_FLAG_SATA) {
3545 rc = sata_link_resume(link, timing, deadline);
3546 /* whine about phy resume failure but proceed */
3547 if (rc && rc != -EOPNOTSUPP)
3548 ata_link_printk(link, KERN_WARNING, "failed to resume "
3549 "link for reset (errno=%d)\n", rc);
3556 * sata_link_hardreset - reset link via SATA phy reset
3557 * @link: link to reset
3558 * @timing: timing parameters { interval, duratinon, timeout } in msec
3559 * @deadline: deadline jiffies for the operation
3561 * SATA phy-reset @link using DET bits of SControl register.
3564 * Kernel thread context (may sleep)
3567 * 0 on success, -errno otherwise.
3569 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3570 unsigned long deadline)
3577 if (sata_set_spd_needed(link)) {
3578 /* SATA spec says nothing about how to reconfigure
3579 * spd. To be on the safe side, turn off phy during
3580 * reconfiguration. This works for at least ICH7 AHCI
3583 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3586 scontrol = (scontrol & 0x0f0) | 0x304;
3588 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3594 /* issue phy wake/reset */
3595 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3598 scontrol = (scontrol & 0x0f0) | 0x301;
3600 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3603 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3604 * 10.4.2 says at least 1 ms.
3608 /* bring link back */
3609 rc = sata_link_resume(link, timing, deadline);
3611 DPRINTK("EXIT, rc=%d\n", rc);
3616 * ata_std_postreset - standard postreset callback
3617 * @link: the target ata_link
3618 * @classes: classes of attached devices
3620 * This function is invoked after a successful reset. Note that
3621 * the device might have been reset more than once using
3622 * different reset methods before postreset is invoked.
3625 * Kernel thread context (may sleep)
3627 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3633 /* print link status */
3634 sata_print_link_status(link);
3637 if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
3638 sata_scr_write(link, SCR_ERROR, serror);
3639 link->eh_info.serror = 0;
3645 * ata_dev_same_device - Determine whether new ID matches configured device
3646 * @dev: device to compare against
3647 * @new_class: class of the new device
3648 * @new_id: IDENTIFY page of the new device
3650 * Compare @new_class and @new_id against @dev and determine
3651 * whether @dev is the device indicated by @new_class and
3658 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
3660 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
3663 const u16 *old_id = dev->id;
3664 unsigned char model[2][ATA_ID_PROD_LEN + 1];
3665 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3667 if (dev->class != new_class) {
3668 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
3669 dev->class, new_class);
3673 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
3674 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
3675 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
3676 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3678 if (strcmp(model[0], model[1])) {
3679 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
3680 "'%s' != '%s'\n", model[0], model[1]);
3684 if (strcmp(serial[0], serial[1])) {
3685 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
3686 "'%s' != '%s'\n", serial[0], serial[1]);
3694 * ata_dev_reread_id - Re-read IDENTIFY data
3695 * @dev: target ATA device
3696 * @readid_flags: read ID flags
3698 * Re-read IDENTIFY page and make sure @dev is still attached to
3702 * Kernel thread context (may sleep)
3705 * 0 on success, negative errno otherwise
3707 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3709 unsigned int class = dev->class;
3710 u16 *id = (void *)dev->link->ap->sector_buf;
3714 rc = ata_dev_read_id(dev, &class, readid_flags, id);
3718 /* is the device still there? */
3719 if (!ata_dev_same_device(dev, class, id))
3722 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3727 * ata_dev_revalidate - Revalidate ATA device
3728 * @dev: device to revalidate
3729 * @new_class: new class code
3730 * @readid_flags: read ID flags
3732 * Re-read IDENTIFY page, make sure @dev is still attached to the
3733 * port and reconfigure it according to the new IDENTIFY page.
3736 * Kernel thread context (may sleep)
3739 * 0 on success, negative errno otherwise
3741 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
3742 unsigned int readid_flags)
3744 u64 n_sectors = dev->n_sectors;
3747 if (!ata_dev_enabled(dev))
3750 /* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
3751 if (ata_class_enabled(new_class) &&
3752 new_class != ATA_DEV_ATA && new_class != ATA_DEV_ATAPI) {
3753 ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
3754 dev->class, new_class);
3760 rc = ata_dev_reread_id(dev, readid_flags);
3764 /* configure device according to the new ID */
3765 rc = ata_dev_configure(dev);
3769 /* verify n_sectors hasn't changed */
3770 if (dev->class == ATA_DEV_ATA && n_sectors &&
3771 dev->n_sectors != n_sectors) {
3772 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
3774 (unsigned long long)n_sectors,
3775 (unsigned long long)dev->n_sectors);
3777 /* restore original n_sectors */
3778 dev->n_sectors = n_sectors;
3787 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3791 struct ata_blacklist_entry {
3792 const char *model_num;
3793 const char *model_rev;
3794 unsigned long horkage;
3797 static const struct ata_blacklist_entry ata_device_blacklist [] = {
3798 /* Devices with DMA related problems under Linux */
3799 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
3800 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
3801 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
3802 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
3803 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
3804 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
3805 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
3806 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
3807 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
3808 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
3809 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
3810 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
3811 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
3812 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
3813 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
3814 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
3815 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
3816 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
3817 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
3818 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
3819 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
3820 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
3821 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
3822 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
3823 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
3824 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
3825 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
3826 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
3827 { "SAMSUNG CD-ROM SN-124", "N001", ATA_HORKAGE_NODMA },
3828 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA },
3829 /* Odd clown on sil3726/4726 PMPs */
3830 { "Config Disk", NULL, ATA_HORKAGE_NODMA |
3831 ATA_HORKAGE_SKIP_PM },
3833 /* Weird ATAPI devices */
3834 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
3836 /* Devices we expect to fail diagnostics */
3838 /* Devices where NCQ should be avoided */
3840 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
3841 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, },
3842 /* http://thread.gmane.org/gmane.linux.ide/14907 */
3843 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ },
3845 { "Maxtor *", "BANC*", ATA_HORKAGE_NONCQ },
3846 { "Maxtor 7V300F0", "VA111630", ATA_HORKAGE_NONCQ },
3847 { "ST380817AS", "3.42", ATA_HORKAGE_NONCQ },
3848 { "ST3160023AS", "3.42", ATA_HORKAGE_NONCQ },
3850 /* Blacklist entries taken from Silicon Image 3124/3132
3851 Windows driver .inf file - also several Linux problem reports */
3852 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, },
3853 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, },
3854 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, },
3856 /* devices which puke on READ_NATIVE_MAX */
3857 { "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, },
3858 { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
3859 { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
3860 { "MAXTOR 6L080L4", "A93.0500", ATA_HORKAGE_BROKEN_HPA },
3862 /* Devices which report 1 sector over size HPA */
3863 { "ST340823A", NULL, ATA_HORKAGE_HPA_SIZE, },
3864 { "ST320413A", NULL, ATA_HORKAGE_HPA_SIZE, },
3865 { "ST310211A", NULL, ATA_HORKAGE_HPA_SIZE, },
3867 /* Devices which get the IVB wrong */
3868 { "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
3869 { "TSSTcorp CDDVDW SH-S202J", "SB00", ATA_HORKAGE_IVB, },
3870 { "TSSTcorp CDDVDW SH-S202J", "SB01", ATA_HORKAGE_IVB, },
3871 { "TSSTcorp CDDVDW SH-S202N", "SB00", ATA_HORKAGE_IVB, },
3872 { "TSSTcorp CDDVDW SH-S202N", "SB01", ATA_HORKAGE_IVB, },
3878 static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
3884 * check for trailing wildcard: *\0
3886 p = strchr(patt, wildchar);
3887 if (p && ((*(p + 1)) == 0))
3898 return strncmp(patt, name, len);
3901 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
3903 unsigned char model_num[ATA_ID_PROD_LEN + 1];
3904 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3905 const struct ata_blacklist_entry *ad = ata_device_blacklist;
3907 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
3908 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
3910 while (ad->model_num) {
3911 if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
3912 if (ad->model_rev == NULL)
3914 if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
3922 static int ata_dma_blacklisted(const struct ata_device *dev)
3924 /* We don't support polling DMA.
3925 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
3926 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
3928 if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
3929 (dev->flags & ATA_DFLAG_CDB_INTR))
3931 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
3935 * ata_is_40wire - check drive side detection
3938 * Perform drive side detection decoding, allowing for device vendors
3939 * who can't follow the documentation.
3942 static int ata_is_40wire(struct ata_device *dev)
3944 if (dev->horkage & ATA_HORKAGE_IVB)
3945 return ata_drive_40wire_relaxed(dev->id);
3946 return ata_drive_40wire(dev->id);
3950 * cable_is_40wire - 40/80/SATA decider
3951 * @ap: port to consider
3953 * This function encapsulates the policy for speed management
3954 * in one place. At the moment we don't cache the result but
3955 * there is a good case for setting ap->cbl to the result when
3956 * we are called with unknown cables (and figuring out if it
3957 * impacts hotplug at all).
3959 * Return 1 if the cable appears to be 40 wire.
3962 static int cable_is_40wire(struct ata_port *ap)
3964 struct ata_link *link;
3965 struct ata_device *dev;
3967 /* If the controller thinks we are 40 wire, we are */
3968 if (ap->cbl == ATA_CBL_PATA40)
3970 /* If the controller thinks we are 80 wire, we are */
3971 if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
3973 /* If the controller doesn't know we scan
3975 - Note: We look for all 40 wire detects at this point.
3976 Any 80 wire detect is taken to be 80 wire cable
3978 - In many setups only the one drive (slave if present)
3979 will give a valid detect
3980 - If you have a non detect capable drive you don't
3981 want it to colour the choice
3983 ata_port_for_each_link(link, ap) {
3984 ata_link_for_each_dev(dev, link) {
3985 if (!ata_is_40wire(dev))
3993 * ata_dev_xfermask - Compute supported xfermask of the given device
3994 * @dev: Device to compute xfermask for
3996 * Compute supported xfermask of @dev and store it in
3997 * dev->*_mask. This function is responsible for applying all
3998 * known limits including host controller limits, device
4004 static void ata_dev_xfermask(struct ata_device *dev)
4006 struct ata_link *link = dev->link;
4007 struct ata_port *ap = link->ap;
4008 struct ata_host *host = ap->host;
4009 unsigned long xfer_mask;
4011 /* controller modes available */
4012 xfer_mask = ata_pack_xfermask(ap->pio_mask,
4013 ap->mwdma_mask, ap->udma_mask);
4015 /* drive modes available */
4016 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
4017 dev->mwdma_mask, dev->udma_mask);
4018 xfer_mask &= ata_id_xfermask(dev->id);
4021 * CFA Advanced TrueIDE timings are not allowed on a shared
4024 if (ata_dev_pair(dev)) {
4025 /* No PIO5 or PIO6 */
4026 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
4027 /* No MWDMA3 or MWDMA 4 */
4028 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
4031 if (ata_dma_blacklisted(dev)) {
4032 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4033 ata_dev_printk(dev, KERN_WARNING,
4034 "device is on DMA blacklist, disabling DMA\n");
4037 if ((host->flags & ATA_HOST_SIMPLEX) &&
4038 host->simplex_claimed && host->simplex_claimed != ap) {
4039 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4040 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
4041 "other device, disabling DMA\n");
4044 if (ap->flags & ATA_FLAG_NO_IORDY)
4045 xfer_mask &= ata_pio_mask_no_iordy(dev);
4047 if (ap->ops->mode_filter)
4048 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4050 /* Apply cable rule here. Don't apply it early because when
4051 * we handle hot plug the cable type can itself change.
4052 * Check this last so that we know if the transfer rate was
4053 * solely limited by the cable.
4054 * Unknown or 80 wire cables reported host side are checked
4055 * drive side as well. Cases where we know a 40wire cable
4056 * is used safely for 80 are not checked here.
4058 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
4059 /* UDMA/44 or higher would be available */
4060 if (cable_is_40wire(ap)) {
4061 ata_dev_printk(dev, KERN_WARNING,
4062 "limited to UDMA/33 due to 40-wire cable\n");
4063 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
4066 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
4067 &dev->mwdma_mask, &dev->udma_mask);
4071 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
4072 * @dev: Device to which command will be sent
4074 * Issue SET FEATURES - XFER MODE command to device @dev
4078 * PCI/etc. bus probe sem.
4081 * 0 on success, AC_ERR_* mask otherwise.
4084 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
4086 struct ata_taskfile tf;
4087 unsigned int err_mask;
4089 /* set up set-features taskfile */
4090 DPRINTK("set features - xfer mode\n");
4092 /* Some controllers and ATAPI devices show flaky interrupt
4093 * behavior after setting xfer mode. Use polling instead.
4095 ata_tf_init(dev, &tf);
4096 tf.command = ATA_CMD_SET_FEATURES;
4097 tf.feature = SETFEATURES_XFER;
4098 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4099 tf.protocol = ATA_PROT_NODATA;
4100 /* If we are using IORDY we must send the mode setting command */
4101 if (ata_pio_need_iordy(dev))
4102 tf.nsect = dev->xfer_mode;
4103 /* If the device has IORDY and the controller does not - turn it off */
4104 else if (ata_id_has_iordy(dev->id))
4106 else /* In the ancient relic department - skip all of this */
4109 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4111 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4115 * ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4116 * @dev: Device to which command will be sent
4117 * @enable: Whether to enable or disable the feature
4118 * @feature: The sector count represents the feature to set
4120 * Issue SET FEATURES - SATA FEATURES command to device @dev
4121 * on port @ap with sector count
4124 * PCI/etc. bus probe sem.
4127 * 0 on success, AC_ERR_* mask otherwise.
4129 static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
4132 struct ata_taskfile tf;
4133 unsigned int err_mask;
4135 /* set up set-features taskfile */
4136 DPRINTK("set features - SATA features\n");
4138 ata_tf_init(dev, &tf);
4139 tf.command = ATA_CMD_SET_FEATURES;
4140 tf.feature = enable;
4141 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4142 tf.protocol = ATA_PROT_NODATA;
4145 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4147 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4152 * ata_dev_init_params - Issue INIT DEV PARAMS command
4153 * @dev: Device to which command will be sent
4154 * @heads: Number of heads (taskfile parameter)
4155 * @sectors: Number of sectors (taskfile parameter)
4158 * Kernel thread context (may sleep)
4161 * 0 on success, AC_ERR_* mask otherwise.
4163 static unsigned int ata_dev_init_params(struct ata_device *dev,
4164 u16 heads, u16 sectors)
4166 struct ata_taskfile tf;
4167 unsigned int err_mask;
4169 /* Number of sectors per track 1-255. Number of heads 1-16 */
4170 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4171 return AC_ERR_INVALID;
4173 /* set up init dev params taskfile */
4174 DPRINTK("init dev params \n");
4176 ata_tf_init(dev, &tf);
4177 tf.command = ATA_CMD_INIT_DEV_PARAMS;
4178 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4179 tf.protocol = ATA_PROT_NODATA;
4181 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4183 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4184 /* A clean abort indicates an original or just out of spec drive
4185 and we should continue as we issue the setup based on the
4186 drive reported working geometry */
4187 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4190 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4195 * ata_sg_clean - Unmap DMA memory associated with command
4196 * @qc: Command containing DMA memory to be released
4198 * Unmap all mapped DMA memory associated with this command.
4201 * spin_lock_irqsave(host lock)
4203 void ata_sg_clean(struct ata_queued_cmd *qc)
4205 struct ata_port *ap = qc->ap;
4206 struct scatterlist *sg = qc->sg;
4207 int dir = qc->dma_dir;
4209 WARN_ON(sg == NULL);
4211 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
4214 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4216 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4221 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
4222 * @qc: Metadata associated with taskfile to check
4224 * Allow low-level driver to filter ATA PACKET commands, returning
4225 * a status indicating whether or not it is OK to use DMA for the
4226 * supplied PACKET command.
4229 * spin_lock_irqsave(host lock)
4231 * RETURNS: 0 when ATAPI DMA can be used
4234 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
4236 struct ata_port *ap = qc->ap;
4238 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a
4239 * few ATAPI devices choke on such DMA requests.
4241 if (unlikely(qc->nbytes & 15))
4244 if (ap->ops->check_atapi_dma)
4245 return ap->ops->check_atapi_dma(qc);
4251 * ata_std_qc_defer - Check whether a qc needs to be deferred
4252 * @qc: ATA command in question
4254 * Non-NCQ commands cannot run with any other command, NCQ or
4255 * not. As upper layer only knows the queue depth, we are
4256 * responsible for maintaining exclusion. This function checks
4257 * whether a new command @qc can be issued.
4260 * spin_lock_irqsave(host lock)
4263 * ATA_DEFER_* if deferring is needed, 0 otherwise.
4265 int ata_std_qc_defer(struct ata_queued_cmd *qc)
4267 struct ata_link *link = qc->dev->link;
4269 if (qc->tf.protocol == ATA_PROT_NCQ) {
4270 if (!ata_tag_valid(link->active_tag))
4273 if (!ata_tag_valid(link->active_tag) && !link->sactive)
4277 return ATA_DEFER_LINK;
4280 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4283 * ata_sg_init - Associate command with scatter-gather table.
4284 * @qc: Command to be associated
4285 * @sg: Scatter-gather table.
4286 * @n_elem: Number of elements in s/g table.
4288 * Initialize the data-related elements of queued_cmd @qc
4289 * to point to a scatter-gather table @sg, containing @n_elem
4293 * spin_lock_irqsave(host lock)
4295 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4296 unsigned int n_elem)
4299 qc->n_elem = n_elem;
4304 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
4305 * @qc: Command with scatter-gather table to be mapped.
4307 * DMA-map the scatter-gather table associated with queued_cmd @qc.
4310 * spin_lock_irqsave(host lock)
4313 * Zero on success, negative on error.
4316 static int ata_sg_setup(struct ata_queued_cmd *qc)
4318 struct ata_port *ap = qc->ap;
4319 unsigned int n_elem;
4321 VPRINTK("ENTER, ata%u\n", ap->print_id);
4323 n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
4327 DPRINTK("%d sg elements mapped\n", n_elem);
4329 qc->n_elem = n_elem;
4330 qc->flags |= ATA_QCFLAG_DMAMAP;
4336 * swap_buf_le16 - swap halves of 16-bit words in place
4337 * @buf: Buffer to swap
4338 * @buf_words: Number of 16-bit words in buffer.
4340 * Swap halves of 16-bit words if needed to convert from
4341 * little-endian byte order to native cpu byte order, or
4345 * Inherited from caller.
4347 void swap_buf_le16(u16 *buf, unsigned int buf_words)
4352 for (i = 0; i < buf_words; i++)
4353 buf[i] = le16_to_cpu(buf[i]);
4354 #endif /* __BIG_ENDIAN */
4358 * ata_qc_new - Request an available ATA command, for queueing
4359 * @ap: Port associated with device @dev
4360 * @dev: Device from whom we request an available command structure
4366 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
4368 struct ata_queued_cmd *qc = NULL;
4371 /* no command while frozen */
4372 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4375 /* the last tag is reserved for internal command. */
4376 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4377 if (!test_and_set_bit(i, &ap->qc_allocated)) {
4378 qc = __ata_qc_from_tag(ap, i);
4389 * ata_qc_new_init - Request an available ATA command, and initialize it
4390 * @dev: Device from whom we request an available command structure
4396 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
4398 struct ata_port *ap = dev->link->ap;
4399 struct ata_queued_cmd *qc;
4401 qc = ata_qc_new(ap);
4414 * ata_qc_free - free unused ata_queued_cmd
4415 * @qc: Command to complete
4417 * Designed to free unused ata_queued_cmd object
4418 * in case something prevents using it.
4421 * spin_lock_irqsave(host lock)
4423 void ata_qc_free(struct ata_queued_cmd *qc)
4425 struct ata_port *ap = qc->ap;
4428 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4432 if (likely(ata_tag_valid(tag))) {
4433 qc->tag = ATA_TAG_POISON;
4434 clear_bit(tag, &ap->qc_allocated);
4438 void __ata_qc_complete(struct ata_queued_cmd *qc)
4440 struct ata_port *ap = qc->ap;
4441 struct ata_link *link = qc->dev->link;
4443 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4444 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
4446 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4449 /* command should be marked inactive atomically with qc completion */
4450 if (qc->tf.protocol == ATA_PROT_NCQ) {
4451 link->sactive &= ~(1 << qc->tag);
4453 ap->nr_active_links--;
4455 link->active_tag = ATA_TAG_POISON;
4456 ap->nr_active_links--;
4459 /* clear exclusive status */
4460 if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
4461 ap->excl_link == link))
4462 ap->excl_link = NULL;
4464 /* atapi: mark qc as inactive to prevent the interrupt handler
4465 * from completing the command twice later, before the error handler
4466 * is called. (when rc != 0 and atapi request sense is needed)
4468 qc->flags &= ~ATA_QCFLAG_ACTIVE;
4469 ap->qc_active &= ~(1 << qc->tag);
4471 /* call completion callback */
4472 qc->complete_fn(qc);
4475 static void fill_result_tf(struct ata_queued_cmd *qc)
4477 struct ata_port *ap = qc->ap;
4479 qc->result_tf.flags = qc->tf.flags;
4480 ap->ops->sff_tf_read(ap, &qc->result_tf);
4483 static void ata_verify_xfer(struct ata_queued_cmd *qc)
4485 struct ata_device *dev = qc->dev;
4487 if (ata_tag_internal(qc->tag))
4490 if (ata_is_nodata(qc->tf.protocol))
4493 if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
4496 dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
4500 * ata_qc_complete - Complete an active ATA command
4501 * @qc: Command to complete
4502 * @err_mask: ATA Status register contents
4504 * Indicate to the mid and upper layers that an ATA
4505 * command has completed, with either an ok or not-ok status.
4508 * spin_lock_irqsave(host lock)
4510 void ata_qc_complete(struct ata_queued_cmd *qc)
4512 struct ata_port *ap = qc->ap;
4514 /* XXX: New EH and old EH use different mechanisms to
4515 * synchronize EH with regular execution path.
4517 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4518 * Normal execution path is responsible for not accessing a
4519 * failed qc. libata core enforces the rule by returning NULL
4520 * from ata_qc_from_tag() for failed qcs.
4522 * Old EH depends on ata_qc_complete() nullifying completion
4523 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4524 * not synchronize with interrupt handler. Only PIO task is
4527 if (ap->ops->error_handler) {
4528 struct ata_device *dev = qc->dev;
4529 struct ata_eh_info *ehi = &dev->link->eh_info;
4531 WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4533 if (unlikely(qc->err_mask))
4534 qc->flags |= ATA_QCFLAG_FAILED;
4536 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
4537 if (!ata_tag_internal(qc->tag)) {
4538 /* always fill result TF for failed qc */
4540 ata_qc_schedule_eh(qc);
4545 /* read result TF if requested */
4546 if (qc->flags & ATA_QCFLAG_RESULT_TF)
4549 /* Some commands need post-processing after successful
4552 switch (qc->tf.command) {
4553 case ATA_CMD_SET_FEATURES:
4554 if (qc->tf.feature != SETFEATURES_WC_ON &&
4555 qc->tf.feature != SETFEATURES_WC_OFF)
4558 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
4559 case ATA_CMD_SET_MULTI: /* multi_count changed */
4560 /* revalidate device */
4561 ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
4562 ata_port_schedule_eh(ap);
4566 dev->flags |= ATA_DFLAG_SLEEPING;
4570 if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
4571 ata_verify_xfer(qc);
4573 __ata_qc_complete(qc);
4575 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
4578 /* read result TF if failed or requested */
4579 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
4582 __ata_qc_complete(qc);
4587 * ata_qc_complete_multiple - Complete multiple qcs successfully
4588 * @ap: port in question
4589 * @qc_active: new qc_active mask
4590 * @finish_qc: LLDD callback invoked before completing a qc
4592 * Complete in-flight commands. This functions is meant to be
4593 * called from low-level driver's interrupt routine to complete
4594 * requests normally. ap->qc_active and @qc_active is compared
4595 * and commands are completed accordingly.
4598 * spin_lock_irqsave(host lock)
4601 * Number of completed commands on success, -errno otherwise.
4603 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
4604 void (*finish_qc)(struct ata_queued_cmd *))
4610 done_mask = ap->qc_active ^ qc_active;
4612 if (unlikely(done_mask & qc_active)) {
4613 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
4614 "(%08x->%08x)\n", ap->qc_active, qc_active);
4618 for (i = 0; i < ATA_MAX_QUEUE; i++) {
4619 struct ata_queued_cmd *qc;
4621 if (!(done_mask & (1 << i)))
4624 if ((qc = ata_qc_from_tag(ap, i))) {
4627 ata_qc_complete(qc);
4636 * ata_qc_issue - issue taskfile to device
4637 * @qc: command to issue to device
4639 * Prepare an ATA command to submission to device.
4640 * This includes mapping the data into a DMA-able
4641 * area, filling in the S/G table, and finally
4642 * writing the taskfile to hardware, starting the command.
4645 * spin_lock_irqsave(host lock)
4647 void ata_qc_issue(struct ata_queued_cmd *qc)
4649 struct ata_port *ap = qc->ap;
4650 struct ata_link *link = qc->dev->link;
4651 u8 prot = qc->tf.protocol;
4653 /* Make sure only one non-NCQ command is outstanding. The
4654 * check is skipped for old EH because it reuses active qc to
4655 * request ATAPI sense.
4657 WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
4659 if (ata_is_ncq(prot)) {
4660 WARN_ON(link->sactive & (1 << qc->tag));
4663 ap->nr_active_links++;
4664 link->sactive |= 1 << qc->tag;
4666 WARN_ON(link->sactive);
4668 ap->nr_active_links++;
4669 link->active_tag = qc->tag;
4672 qc->flags |= ATA_QCFLAG_ACTIVE;
4673 ap->qc_active |= 1 << qc->tag;
4675 /* We guarantee to LLDs that they will have at least one
4676 * non-zero sg if the command is a data command.
4678 BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
4680 if (ata_is_dma(prot) || (ata_is_pio(prot) &&
4681 (ap->flags & ATA_FLAG_PIO_DMA)))
4682 if (ata_sg_setup(qc))
4685 /* if device is sleeping, schedule reset and abort the link */
4686 if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
4687 link->eh_info.action |= ATA_EH_RESET;
4688 ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
4689 ata_link_abort(link);
4693 ap->ops->qc_prep(qc);
4695 qc->err_mask |= ap->ops->qc_issue(qc);
4696 if (unlikely(qc->err_mask))
4701 qc->err_mask |= AC_ERR_SYSTEM;
4703 ata_qc_complete(qc);
4707 * sata_scr_valid - test whether SCRs are accessible
4708 * @link: ATA link to test SCR accessibility for
4710 * Test whether SCRs are accessible for @link.
4716 * 1 if SCRs are accessible, 0 otherwise.
4718 int sata_scr_valid(struct ata_link *link)
4720 struct ata_port *ap = link->ap;
4722 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
4726 * sata_scr_read - read SCR register of the specified port
4727 * @link: ATA link to read SCR for
4729 * @val: Place to store read value
4731 * Read SCR register @reg of @link into *@val. This function is
4732 * guaranteed to succeed if @link is ap->link, the cable type of
4733 * the port is SATA and the port implements ->scr_read.
4736 * None if @link is ap->link. Kernel thread context otherwise.
4739 * 0 on success, negative errno on failure.
4741 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
4743 if (ata_is_host_link(link)) {
4744 struct ata_port *ap = link->ap;
4746 if (sata_scr_valid(link))
4747 return ap->ops->scr_read(ap, reg, val);
4751 return sata_pmp_scr_read(link, reg, val);
4755 * sata_scr_write - write SCR register of the specified port
4756 * @link: ATA link to write SCR for
4757 * @reg: SCR to write
4758 * @val: value to write
4760 * Write @val to SCR register @reg of @link. This function is
4761 * guaranteed to succeed if @link is ap->link, the cable type of
4762 * the port is SATA and the port implements ->scr_read.
4765 * None if @link is ap->link. Kernel thread context otherwise.
4768 * 0 on success, negative errno on failure.
4770 int sata_scr_write(struct ata_link *link, int reg, u32 val)
4772 if (ata_is_host_link(link)) {
4773 struct ata_port *ap = link->ap;
4775 if (sata_scr_valid(link))
4776 return ap->ops->scr_write(ap, reg, val);
4780 return sata_pmp_scr_write(link, reg, val);
4784 * sata_scr_write_flush - write SCR register of the specified port and flush
4785 * @link: ATA link to write SCR for
4786 * @reg: SCR to write
4787 * @val: value to write
4789 * This function is identical to sata_scr_write() except that this
4790 * function performs flush after writing to the register.
4793 * None if @link is ap->link. Kernel thread context otherwise.
4796 * 0 on success, negative errno on failure.
4798 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
4800 if (ata_is_host_link(link)) {
4801 struct ata_port *ap = link->ap;
4804 if (sata_scr_valid(link)) {
4805 rc = ap->ops->scr_write(ap, reg, val);
4807 rc = ap->ops->scr_read(ap, reg, &val);
4813 return sata_pmp_scr_write(link, reg, val);
4817 * ata_link_online - test whether the given link is online
4818 * @link: ATA link to test
4820 * Test whether @link is online. Note that this function returns
4821 * 0 if online status of @link cannot be obtained, so
4822 * ata_link_online(link) != !ata_link_offline(link).
4828 * 1 if the port online status is available and online.
4830 int ata_link_online(struct ata_link *link)
4834 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
4835 (sstatus & 0xf) == 0x3)
4841 * ata_link_offline - test whether the given link is offline
4842 * @link: ATA link to test
4844 * Test whether @link is offline. Note that this function
4845 * returns 0 if offline status of @link cannot be obtained, so
4846 * ata_link_online(link) != !ata_link_offline(link).
4852 * 1 if the port offline status is available and offline.
4854 int ata_link_offline(struct ata_link *link)
4858 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
4859 (sstatus & 0xf) != 0x3)
4865 static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
4866 unsigned int action, unsigned int ehi_flags,
4869 unsigned long flags;
4872 for (i = 0; i < host->n_ports; i++) {
4873 struct ata_port *ap = host->ports[i];
4874 struct ata_link *link;
4876 /* Previous resume operation might still be in
4877 * progress. Wait for PM_PENDING to clear.
4879 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
4880 ata_port_wait_eh(ap);
4881 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
4884 /* request PM ops to EH */
4885 spin_lock_irqsave(ap->lock, flags);
4890 ap->pm_result = &rc;
4893 ap->pflags |= ATA_PFLAG_PM_PENDING;
4894 __ata_port_for_each_link(link, ap) {
4895 link->eh_info.action |= action;
4896 link->eh_info.flags |= ehi_flags;
4899 ata_port_schedule_eh(ap);
4901 spin_unlock_irqrestore(ap->lock, flags);
4903 /* wait and check result */
4905 ata_port_wait_eh(ap);
4906 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
4916 * ata_host_suspend - suspend host
4917 * @host: host to suspend
4920 * Suspend @host. Actual operation is performed by EH. This
4921 * function requests EH to perform PM operations and waits for EH
4925 * Kernel thread context (may sleep).
4928 * 0 on success, -errno on failure.
4930 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
4935 * disable link pm on all ports before requesting
4938 ata_lpm_enable(host);
4940 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
4942 host->dev->power.power_state = mesg;
4947 * ata_host_resume - resume host
4948 * @host: host to resume
4950 * Resume @host. Actual operation is performed by EH. This
4951 * function requests EH to perform PM operations and returns.
4952 * Note that all resume operations are performed parallely.
4955 * Kernel thread context (may sleep).
4957 void ata_host_resume(struct ata_host *host)
4959 ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
4960 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
4961 host->dev->power.power_state = PMSG_ON;
4963 /* reenable link pm */
4964 ata_lpm_disable(host);
4969 * ata_port_start - Set port up for dma.
4970 * @ap: Port to initialize
4972 * Called just after data structures for each port are
4973 * initialized. Allocates space for PRD table.
4975 * May be used as the port_start() entry in ata_port_operations.
4978 * Inherited from caller.
4980 int ata_port_start(struct ata_port *ap)
4982 struct device *dev = ap->dev;
4984 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
4993 * ata_dev_init - Initialize an ata_device structure
4994 * @dev: Device structure to initialize
4996 * Initialize @dev in preparation for probing.
4999 * Inherited from caller.
5001 void ata_dev_init(struct ata_device *dev)
5003 struct ata_link *link = dev->link;
5004 struct ata_port *ap = link->ap;
5005 unsigned long flags;
5007 /* SATA spd limit is bound to the first device */
5008 link->sata_spd_limit = link->hw_sata_spd_limit;
5011 /* High bits of dev->flags are used to record warm plug
5012 * requests which occur asynchronously. Synchronize using
5015 spin_lock_irqsave(ap->lock, flags);
5016 dev->flags &= ~ATA_DFLAG_INIT_MASK;
5018 spin_unlock_irqrestore(ap->lock, flags);
5020 memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
5021 sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5022 dev->pio_mask = UINT_MAX;
5023 dev->mwdma_mask = UINT_MAX;
5024 dev->udma_mask = UINT_MAX;
5028 * ata_link_init - Initialize an ata_link structure
5029 * @ap: ATA port link is attached to
5030 * @link: Link structure to initialize
5031 * @pmp: Port multiplier port number
5036 * Kernel thread context (may sleep)
5038 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5042 /* clear everything except for devices */
5043 memset(link, 0, offsetof(struct ata_link, device[0]));
5047 link->active_tag = ATA_TAG_POISON;
5048 link->hw_sata_spd_limit = UINT_MAX;
5050 /* can't use iterator, ap isn't initialized yet */
5051 for (i = 0; i < ATA_MAX_DEVICES; i++) {
5052 struct ata_device *dev = &link->device[i];
5055 dev->devno = dev - link->device;
5061 * sata_link_init_spd - Initialize link->sata_spd_limit
5062 * @link: Link to configure sata_spd_limit for
5064 * Initialize @link->[hw_]sata_spd_limit to the currently
5068 * Kernel thread context (may sleep).
5071 * 0 on success, -errno on failure.
5073 int sata_link_init_spd(struct ata_link *link)
5079 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
5083 spd = (scontrol >> 4) & 0xf;
5085 link->hw_sata_spd_limit &= (1 << spd) - 1;
5087 ata_force_spd_limit(link);
5089 link->sata_spd_limit = link->hw_sata_spd_limit;
5095 * ata_port_alloc - allocate and initialize basic ATA port resources
5096 * @host: ATA host this allocated port belongs to
5098 * Allocate and initialize basic ATA port resources.
5101 * Allocate ATA port on success, NULL on failure.
5104 * Inherited from calling layer (may sleep).
5106 struct ata_port *ata_port_alloc(struct ata_host *host)
5108 struct ata_port *ap;
5112 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
5116 ap->pflags |= ATA_PFLAG_INITIALIZING;
5117 ap->lock = &host->lock;
5118 ap->flags = ATA_FLAG_DISABLED;
5120 ap->ctl = ATA_DEVCTL_OBS;
5122 ap->dev = host->dev;
5123 ap->last_ctl = 0xFF;
5125 #if defined(ATA_VERBOSE_DEBUG)
5126 /* turn on all debugging levels */
5127 ap->msg_enable = 0x00FF;
5128 #elif defined(ATA_DEBUG)
5129 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
5131 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5134 INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
5135 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
5136 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5137 INIT_LIST_HEAD(&ap->eh_done_q);
5138 init_waitqueue_head(&ap->eh_wait_q);
5139 init_timer_deferrable(&ap->fastdrain_timer);
5140 ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
5141 ap->fastdrain_timer.data = (unsigned long)ap;
5143 ap->cbl = ATA_CBL_NONE;
5145 ata_link_init(ap, &ap->link, 0);
5148 ap->stats.unhandled_irq = 1;
5149 ap->stats.idle_irq = 1;
5154 static void ata_host_release(struct device *gendev, void *res)
5156 struct ata_host *host = dev_get_drvdata(gendev);
5159 for (i = 0; i < host->n_ports; i++) {
5160 struct ata_port *ap = host->ports[i];
5166 scsi_host_put(ap->scsi_host);
5168 kfree(ap->pmp_link);
5170 host->ports[i] = NULL;
5173 dev_set_drvdata(gendev, NULL);
5177 * ata_host_alloc - allocate and init basic ATA host resources
5178 * @dev: generic device this host is associated with
5179 * @max_ports: maximum number of ATA ports associated with this host
5181 * Allocate and initialize basic ATA host resources. LLD calls
5182 * this function to allocate a host, initializes it fully and
5183 * attaches it using ata_host_register().
5185 * @max_ports ports are allocated and host->n_ports is
5186 * initialized to @max_ports. The caller is allowed to decrease
5187 * host->n_ports before calling ata_host_register(). The unused
5188 * ports will be automatically freed on registration.
5191 * Allocate ATA host on success, NULL on failure.
5194 * Inherited from calling layer (may sleep).
5196 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
5198 struct ata_host *host;
5204 if (!devres_open_group(dev, NULL, GFP_KERNEL))
5207 /* alloc a container for our list of ATA ports (buses) */
5208 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
5209 /* alloc a container for our list of ATA ports (buses) */
5210 host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
5214 devres_add(dev, host);
5215 dev_set_drvdata(dev, host);
5217 spin_lock_init(&host->lock);
5219 host->n_ports = max_ports;
5221 /* allocate ports bound to this host */
5222 for (i = 0; i < max_ports; i++) {
5223 struct ata_port *ap;
5225 ap = ata_port_alloc(host);
5230 host->ports[i] = ap;
5233 devres_remove_group(dev, NULL);
5237 devres_release_group(dev, NULL);
5242 * ata_host_alloc_pinfo - alloc host and init with port_info array
5243 * @dev: generic device this host is associated with
5244 * @ppi: array of ATA port_info to initialize host with
5245 * @n_ports: number of ATA ports attached to this host
5247 * Allocate ATA host and initialize with info from @ppi. If NULL
5248 * terminated, @ppi may contain fewer entries than @n_ports. The
5249 * last entry will be used for the remaining ports.
5252 * Allocate ATA host on success, NULL on failure.
5255 * Inherited from calling layer (may sleep).
5257 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
5258 const struct ata_port_info * const * ppi,
5261 const struct ata_port_info *pi;
5262 struct ata_host *host;
5265 host = ata_host_alloc(dev, n_ports);
5269 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
5270 struct ata_port *ap = host->ports[i];
5275 ap->pio_mask = pi->pio_mask;
5276 ap->mwdma_mask = pi->mwdma_mask;
5277 ap->udma_mask = pi->udma_mask;
5278 ap->flags |= pi->flags;
5279 ap->link.flags |= pi->link_flags;
5280 ap->ops = pi->port_ops;
5282 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
5283 host->ops = pi->port_ops;
5289 static void ata_host_stop(struct device *gendev, void *res)
5291 struct ata_host *host = dev_get_drvdata(gendev);
5294 WARN_ON(!(host->flags & ATA_HOST_STARTED));
5296 for (i = 0; i < host->n_ports; i++) {
5297 struct ata_port *ap = host->ports[i];
5299 if (ap->ops->port_stop)
5300 ap->ops->port_stop(ap);
5303 if (host->ops->host_stop)
5304 host->ops->host_stop(host);
5308 * ata_finalize_port_ops - finalize ata_port_operations
5309 * @ops: ata_port_operations to finalize
5311 * An ata_port_operations can inherit from another ops and that
5312 * ops can again inherit from another. This can go on as many
5313 * times as necessary as long as there is no loop in the
5314 * inheritance chain.
5316 * Ops tables are finalized when the host is started. NULL or
5317 * unspecified entries are inherited from the closet ancestor
5318 * which has the method and the entry is populated with it.
5319 * After finalization, the ops table directly points to all the
5320 * methods and ->inherits is no longer necessary and cleared.
5322 * Using ATA_OP_NULL, inheriting ops can force a method to NULL.
5327 static void ata_finalize_port_ops(struct ata_port_operations *ops)
5329 static spinlock_t lock = SPIN_LOCK_UNLOCKED;
5330 const struct ata_port_operations *cur;
5331 void **begin = (void **)ops;
5332 void **end = (void **)&ops->inherits;
5335 if (!ops || !ops->inherits)
5340 for (cur = ops->inherits; cur; cur = cur->inherits) {
5341 void **inherit = (void **)cur;
5343 for (pp = begin; pp < end; pp++, inherit++)
5348 for (pp = begin; pp < end; pp++)
5352 ops->inherits = NULL;
5358 * ata_host_start - start and freeze ports of an ATA host
5359 * @host: ATA host to start ports for
5361 * Start and then freeze ports of @host. Started status is
5362 * recorded in host->flags, so this function can be called
5363 * multiple times. Ports are guaranteed to get started only
5364 * once. If host->ops isn't initialized yet, its set to the
5365 * first non-dummy port ops.
5368 * Inherited from calling layer (may sleep).
5371 * 0 if all ports are started successfully, -errno otherwise.
5373 int ata_host_start(struct ata_host *host)
5376 void *start_dr = NULL;
5379 if (host->flags & ATA_HOST_STARTED)
5382 ata_finalize_port_ops(host->ops);
5384 for (i = 0; i < host->n_ports; i++) {
5385 struct ata_port *ap = host->ports[i];
5387 ata_finalize_port_ops(ap->ops);
5389 if (!host->ops && !ata_port_is_dummy(ap))
5390 host->ops = ap->ops;
5392 if (ap->ops->port_stop)
5396 if (host->ops->host_stop)
5400 start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
5405 for (i = 0; i < host->n_ports; i++) {
5406 struct ata_port *ap = host->ports[i];
5408 if (ap->ops->port_start) {
5409 rc = ap->ops->port_start(ap);
5412 dev_printk(KERN_ERR, host->dev,
5413 "failed to start port %d "
5414 "(errno=%d)\n", i, rc);
5418 ata_eh_freeze_port(ap);
5422 devres_add(host->dev, start_dr);
5423 host->flags |= ATA_HOST_STARTED;
5428 struct ata_port *ap = host->ports[i];
5430 if (ap->ops->port_stop)
5431 ap->ops->port_stop(ap);
5433 devres_free(start_dr);
5438 * ata_sas_host_init - Initialize a host struct
5439 * @host: host to initialize
5440 * @dev: device host is attached to
5441 * @flags: host flags
5445 * PCI/etc. bus probe sem.
5448 /* KILLME - the only user left is ipr */
5449 void ata_host_init(struct ata_host *host, struct device *dev,
5450 unsigned long flags, struct ata_port_operations *ops)
5452 spin_lock_init(&host->lock);
5454 host->flags = flags;
5459 * ata_host_register - register initialized ATA host
5460 * @host: ATA host to register
5461 * @sht: template for SCSI host
5463 * Register initialized ATA host. @host is allocated using
5464 * ata_host_alloc() and fully initialized by LLD. This function
5465 * starts ports, registers @host with ATA and SCSI layers and
5466 * probe registered devices.
5469 * Inherited from calling layer (may sleep).
5472 * 0 on success, -errno otherwise.
5474 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
5478 /* host must have been started */
5479 if (!(host->flags & ATA_HOST_STARTED)) {
5480 dev_printk(KERN_ERR, host->dev,
5481 "BUG: trying to register unstarted host\n");
5486 /* Blow away unused ports. This happens when LLD can't
5487 * determine the exact number of ports to allocate at
5490 for (i = host->n_ports; host->ports[i]; i++)
5491 kfree(host->ports[i]);
5493 /* give ports names and add SCSI hosts */
5494 for (i = 0; i < host->n_ports; i++)
5495 host->ports[i]->print_id = ata_print_id++;
5497 rc = ata_scsi_add_hosts(host, sht);
5501 /* associate with ACPI nodes */
5502 ata_acpi_associate(host);
5504 /* set cable, sata_spd_limit and report */
5505 for (i = 0; i < host->n_ports; i++) {
5506 struct ata_port *ap = host->ports[i];
5507 unsigned long xfer_mask;
5509 /* set SATA cable type if still unset */
5510 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
5511 ap->cbl = ATA_CBL_SATA;
5513 /* init sata_spd_limit to the current value */
5514 sata_link_init_spd(&ap->link);
5516 /* print per-port info to dmesg */
5517 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
5520 if (!ata_port_is_dummy(ap)) {
5521 ata_port_printk(ap, KERN_INFO,
5522 "%cATA max %s %s\n",
5523 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
5524 ata_mode_string(xfer_mask),
5525 ap->link.eh_info.desc);
5526 ata_ehi_clear_desc(&ap->link.eh_info);
5528 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
5531 /* perform each probe synchronously */
5532 DPRINTK("probe begin\n");
5533 for (i = 0; i < host->n_ports; i++) {
5534 struct ata_port *ap = host->ports[i];
5537 if (ap->ops->error_handler) {
5538 struct ata_eh_info *ehi = &ap->link.eh_info;
5539 unsigned long flags;
5543 /* kick EH for boot probing */
5544 spin_lock_irqsave(ap->lock, flags);
5546 ehi->probe_mask |= ATA_ALL_DEVICES;
5547 ehi->action |= ATA_EH_RESET;
5548 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5550 ap->pflags &= ~ATA_PFLAG_INITIALIZING;
5551 ap->pflags |= ATA_PFLAG_LOADING;
5552 ata_port_schedule_eh(ap);
5554 spin_unlock_irqrestore(ap->lock, flags);
5556 /* wait for EH to finish */
5557 ata_port_wait_eh(ap);
5559 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
5560 rc = ata_bus_probe(ap);
5561 DPRINTK("ata%u: bus probe end\n", ap->print_id);
5564 /* FIXME: do something useful here?
5565 * Current libata behavior will
5566 * tear down everything when
5567 * the module is removed
5568 * or the h/w is unplugged.
5574 /* probes are done, now scan each port's disk(s) */
5575 DPRINTK("host probe begin\n");
5576 for (i = 0; i < host->n_ports; i++) {
5577 struct ata_port *ap = host->ports[i];
5579 ata_scsi_scan_host(ap, 1);
5580 ata_lpm_schedule(ap, ap->pm_policy);
5587 * ata_host_activate - start host, request IRQ and register it
5588 * @host: target ATA host
5589 * @irq: IRQ to request
5590 * @irq_handler: irq_handler used when requesting IRQ
5591 * @irq_flags: irq_flags used when requesting IRQ
5592 * @sht: scsi_host_template to use when registering the host
5594 * After allocating an ATA host and initializing it, most libata
5595 * LLDs perform three steps to activate the host - start host,
5596 * request IRQ and register it. This helper takes necessasry
5597 * arguments and performs the three steps in one go.
5599 * An invalid IRQ skips the IRQ registration and expects the host to
5600 * have set polling mode on the port. In this case, @irq_handler
5604 * Inherited from calling layer (may sleep).
5607 * 0 on success, -errno otherwise.
5609 int ata_host_activate(struct ata_host *host, int irq,
5610 irq_handler_t irq_handler, unsigned long irq_flags,
5611 struct scsi_host_template *sht)
5615 rc = ata_host_start(host);
5619 /* Special case for polling mode */
5621 WARN_ON(irq_handler);
5622 return ata_host_register(host, sht);
5625 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
5626 dev_driver_string(host->dev), host);
5630 for (i = 0; i < host->n_ports; i++)
5631 ata_port_desc(host->ports[i], "irq %d", irq);
5633 rc = ata_host_register(host, sht);
5634 /* if failed, just free the IRQ and leave ports alone */
5636 devm_free_irq(host->dev, irq, host);
5642 * ata_port_detach - Detach ATA port in prepration of device removal
5643 * @ap: ATA port to be detached
5645 * Detach all ATA devices and the associated SCSI devices of @ap;
5646 * then, remove the associated SCSI host. @ap is guaranteed to
5647 * be quiescent on return from this function.
5650 * Kernel thread context (may sleep).
5652 static void ata_port_detach(struct ata_port *ap)
5654 unsigned long flags;
5655 struct ata_link *link;
5656 struct ata_device *dev;
5658 if (!ap->ops->error_handler)
5661 /* tell EH we're leaving & flush EH */
5662 spin_lock_irqsave(ap->lock, flags);
5663 ap->pflags |= ATA_PFLAG_UNLOADING;
5664 spin_unlock_irqrestore(ap->lock, flags);
5666 ata_port_wait_eh(ap);
5668 /* EH is now guaranteed to see UNLOADING - EH context belongs
5669 * to us. Disable all existing devices.
5671 ata_port_for_each_link(link, ap) {
5672 ata_link_for_each_dev(dev, link)
5673 ata_dev_disable(dev);
5676 /* Final freeze & EH. All in-flight commands are aborted. EH
5677 * will be skipped and retrials will be terminated with bad
5680 spin_lock_irqsave(ap->lock, flags);
5681 ata_port_freeze(ap); /* won't be thawed */
5682 spin_unlock_irqrestore(ap->lock, flags);
5684 ata_port_wait_eh(ap);
5685 cancel_rearming_delayed_work(&ap->hotplug_task);
5688 /* remove the associated SCSI host */
5689 scsi_remove_host(ap->scsi_host);
5693 * ata_host_detach - Detach all ports of an ATA host
5694 * @host: Host to detach
5696 * Detach all ports of @host.
5699 * Kernel thread context (may sleep).
5701 void ata_host_detach(struct ata_host *host)
5705 for (i = 0; i < host->n_ports; i++)
5706 ata_port_detach(host->ports[i]);
5708 /* the host is dead now, dissociate ACPI */
5709 ata_acpi_dissociate(host);
5715 * ata_pci_remove_one - PCI layer callback for device removal
5716 * @pdev: PCI device that was removed
5718 * PCI layer indicates to libata via this hook that hot-unplug or
5719 * module unload event has occurred. Detach all ports. Resource
5720 * release is handled via devres.
5723 * Inherited from PCI layer (may sleep).
5725 void ata_pci_remove_one(struct pci_dev *pdev)
5727 struct device *dev = &pdev->dev;
5728 struct ata_host *host = dev_get_drvdata(dev);
5730 ata_host_detach(host);
5733 /* move to PCI subsystem */
5734 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
5736 unsigned long tmp = 0;
5738 switch (bits->width) {
5741 pci_read_config_byte(pdev, bits->reg, &tmp8);
5747 pci_read_config_word(pdev, bits->reg, &tmp16);
5753 pci_read_config_dword(pdev, bits->reg, &tmp32);
5764 return (tmp == bits->val) ? 1 : 0;
5768 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
5770 pci_save_state(pdev);
5771 pci_disable_device(pdev);
5773 if (mesg.event & PM_EVENT_SLEEP)
5774 pci_set_power_state(pdev, PCI_D3hot);
5777 int ata_pci_device_do_resume(struct pci_dev *pdev)
5781 pci_set_power_state(pdev, PCI_D0);
5782 pci_restore_state(pdev);
5784 rc = pcim_enable_device(pdev);
5786 dev_printk(KERN_ERR, &pdev->dev,
5787 "failed to enable device after resume (%d)\n", rc);
5791 pci_set_master(pdev);
5795 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
5797 struct ata_host *host = dev_get_drvdata(&pdev->dev);
5800 rc = ata_host_suspend(host, mesg);
5804 ata_pci_device_do_suspend(pdev, mesg);
5809 int ata_pci_device_resume(struct pci_dev *pdev)
5811 struct ata_host *host = dev_get_drvdata(&pdev->dev);
5814 rc = ata_pci_device_do_resume(pdev);
5816 ata_host_resume(host);
5819 #endif /* CONFIG_PM */
5821 #endif /* CONFIG_PCI */
5823 static int __init ata_parse_force_one(char **cur,
5824 struct ata_force_ent *force_ent,
5825 const char **reason)
5827 /* FIXME: Currently, there's no way to tag init const data and
5828 * using __initdata causes build failure on some versions of
5829 * gcc. Once __initdataconst is implemented, add const to the
5830 * following structure.
5832 static struct ata_force_param force_tbl[] __initdata = {
5833 { "40c", .cbl = ATA_CBL_PATA40 },
5834 { "80c", .cbl = ATA_CBL_PATA80 },
5835 { "short40c", .cbl = ATA_CBL_PATA40_SHORT },
5836 { "unk", .cbl = ATA_CBL_PATA_UNK },
5837 { "ign", .cbl = ATA_CBL_PATA_IGN },
5838 { "sata", .cbl = ATA_CBL_SATA },
5839 { "1.5Gbps", .spd_limit = 1 },
5840 { "3.0Gbps", .spd_limit = 2 },
5841 { "noncq", .horkage_on = ATA_HORKAGE_NONCQ },
5842 { "ncq", .horkage_off = ATA_HORKAGE_NONCQ },
5843 { "pio0", .xfer_mask = 1 << (ATA_SHIFT_PIO + 0) },
5844 { "pio1", .xfer_mask = 1 << (ATA_SHIFT_PIO + 1) },
5845 { "pio2", .xfer_mask = 1 << (ATA_SHIFT_PIO + 2) },
5846 { "pio3", .xfer_mask = 1 << (ATA_SHIFT_PIO + 3) },
5847 { "pio4", .xfer_mask = 1 << (ATA_SHIFT_PIO + 4) },
5848 { "pio5", .xfer_mask = 1 << (ATA_SHIFT_PIO + 5) },
5849 { "pio6", .xfer_mask = 1 << (ATA_SHIFT_PIO + 6) },
5850 { "mwdma0", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 0) },
5851 { "mwdma1", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 1) },
5852 { "mwdma2", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 2) },
5853 { "mwdma3", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 3) },
5854 { "mwdma4", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 4) },
5855 { "udma0", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
5856 { "udma16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
5857 { "udma/16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
5858 { "udma1", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
5859 { "udma25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
5860 { "udma/25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
5861 { "udma2", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
5862 { "udma33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
5863 { "udma/33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
5864 { "udma3", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
5865 { "udma44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
5866 { "udma/44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
5867 { "udma4", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
5868 { "udma66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
5869 { "udma/66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
5870 { "udma5", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
5871 { "udma100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
5872 { "udma/100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
5873 { "udma6", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
5874 { "udma133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
5875 { "udma/133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
5876 { "udma7", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 7) },
5878 char *start = *cur, *p = *cur;
5879 char *id, *val, *endp;
5880 const struct ata_force_param *match_fp = NULL;
5881 int nr_matches = 0, i;
5883 /* find where this param ends and update *cur */
5884 while (*p != '\0' && *p != ',')
5895 p = strchr(start, ':');
5897 val = strstrip(start);
5902 id = strstrip(start);
5903 val = strstrip(p + 1);
5906 p = strchr(id, '.');
5909 force_ent->device = simple_strtoul(p, &endp, 10);
5910 if (p == endp || *endp != '\0') {
5911 *reason = "invalid device";
5916 force_ent->port = simple_strtoul(id, &endp, 10);
5917 if (p == endp || *endp != '\0') {
5918 *reason = "invalid port/link";
5923 /* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */
5924 for (i = 0; i < ARRAY_SIZE(force_tbl); i++) {
5925 const struct ata_force_param *fp = &force_tbl[i];
5927 if (strncasecmp(val, fp->name, strlen(val)))
5933 if (strcasecmp(val, fp->name) == 0) {
5940 *reason = "unknown value";
5943 if (nr_matches > 1) {
5944 *reason = "ambigious value";
5948 force_ent->param = *match_fp;
5953 static void __init ata_parse_force_param(void)
5955 int idx = 0, size = 1;
5956 int last_port = -1, last_device = -1;
5957 char *p, *cur, *next;
5959 /* calculate maximum number of params and allocate force_tbl */
5960 for (p = ata_force_param_buf; *p; p++)
5964 ata_force_tbl = kzalloc(sizeof(ata_force_tbl[0]) * size, GFP_KERNEL);
5965 if (!ata_force_tbl) {
5966 printk(KERN_WARNING "ata: failed to extend force table, "
5967 "libata.force ignored\n");
5971 /* parse and populate the table */
5972 for (cur = ata_force_param_buf; *cur != '\0'; cur = next) {
5973 const char *reason = "";
5974 struct ata_force_ent te = { .port = -1, .device = -1 };
5977 if (ata_parse_force_one(&next, &te, &reason)) {
5978 printk(KERN_WARNING "ata: failed to parse force "
5979 "parameter \"%s\" (%s)\n",
5984 if (te.port == -1) {
5985 te.port = last_port;
5986 te.device = last_device;
5989 ata_force_tbl[idx++] = te;
5991 last_port = te.port;
5992 last_device = te.device;
5995 ata_force_tbl_size = idx;
5998 static int __init ata_init(void)
6000 ata_probe_timeout *= HZ;
6002 ata_parse_force_param();
6004 ata_wq = create_workqueue("ata");
6008 ata_aux_wq = create_singlethread_workqueue("ata_aux");
6010 destroy_workqueue(ata_wq);
6014 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
6018 static void __exit ata_exit(void)
6020 kfree(ata_force_tbl);
6021 destroy_workqueue(ata_wq);
6022 destroy_workqueue(ata_aux_wq);
6025 subsys_initcall(ata_init);
6026 module_exit(ata_exit);
6028 static unsigned long ratelimit_time;
6029 static DEFINE_SPINLOCK(ata_ratelimit_lock);
6031 int ata_ratelimit(void)
6034 unsigned long flags;
6036 spin_lock_irqsave(&ata_ratelimit_lock, flags);
6038 if (time_after(jiffies, ratelimit_time)) {
6040 ratelimit_time = jiffies + (HZ/5);
6044 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
6050 * ata_wait_register - wait until register value changes
6051 * @reg: IO-mapped register
6052 * @mask: Mask to apply to read register value
6053 * @val: Wait condition
6054 * @interval_msec: polling interval in milliseconds
6055 * @timeout_msec: timeout in milliseconds
6057 * Waiting for some bits of register to change is a common
6058 * operation for ATA controllers. This function reads 32bit LE
6059 * IO-mapped register @reg and tests for the following condition.
6061 * (*@reg & mask) != val
6063 * If the condition is met, it returns; otherwise, the process is
6064 * repeated after @interval_msec until timeout.
6067 * Kernel thread context (may sleep)
6070 * The final register value.
6072 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
6073 unsigned long interval_msec,
6074 unsigned long timeout_msec)
6076 unsigned long timeout;
6079 tmp = ioread32(reg);
6081 /* Calculate timeout _after_ the first read to make sure
6082 * preceding writes reach the controller before starting to
6083 * eat away the timeout.
6085 timeout = jiffies + (timeout_msec * HZ) / 1000;
6087 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
6088 msleep(interval_msec);
6089 tmp = ioread32(reg);
6098 static void ata_dummy_noret(struct ata_port *ap) { }
6099 static int ata_dummy_ret0(struct ata_port *ap) { return 0; }
6100 static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }
6102 static u8 ata_dummy_check_status(struct ata_port *ap)
6107 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
6109 return AC_ERR_SYSTEM;
6112 struct ata_port_operations ata_dummy_port_ops = {
6113 .sff_check_status = ata_dummy_check_status,
6114 .sff_check_altstatus = ata_dummy_check_status,
6115 .sff_dev_select = ata_noop_dev_select,
6116 .qc_prep = ata_noop_qc_prep,
6117 .qc_issue = ata_dummy_qc_issue,
6118 .freeze = ata_dummy_noret,
6119 .thaw = ata_dummy_noret,
6120 .error_handler = ata_dummy_noret,
6121 .post_internal_cmd = ata_dummy_qc_noret,
6122 .sff_irq_clear = ata_dummy_noret,
6123 .port_start = ata_dummy_ret0,
6124 .port_stop = ata_dummy_noret,
6127 const struct ata_port_info ata_dummy_port_info = {
6128 .port_ops = &ata_dummy_port_ops,
6132 * libata is essentially a library of internal helper functions for
6133 * low-level ATA host controller drivers. As such, the API/ABI is
6134 * likely to change as new drivers are added and updated.
6135 * Do not depend on ABI/API stability.
6137 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
6138 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
6139 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6140 EXPORT_SYMBOL_GPL(ata_base_port_ops);
6141 EXPORT_SYMBOL_GPL(sata_port_ops);
6142 EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
6143 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6144 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
6145 EXPORT_SYMBOL_GPL(ata_std_bios_param);
6146 EXPORT_SYMBOL_GPL(ata_host_init);
6147 EXPORT_SYMBOL_GPL(ata_host_alloc);
6148 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6149 EXPORT_SYMBOL_GPL(ata_host_start);
6150 EXPORT_SYMBOL_GPL(ata_host_register);
6151 EXPORT_SYMBOL_GPL(ata_host_activate);
6152 EXPORT_SYMBOL_GPL(ata_host_detach);
6153 EXPORT_SYMBOL_GPL(ata_sg_init);
6154 EXPORT_SYMBOL_GPL(ata_qc_complete);
6155 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
6156 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
6157 EXPORT_SYMBOL_GPL(sata_print_link_status);
6158 EXPORT_SYMBOL_GPL(atapi_cmd_type);
6159 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
6160 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6161 EXPORT_SYMBOL_GPL(ata_pack_xfermask);
6162 EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
6163 EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
6164 EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
6165 EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
6166 EXPORT_SYMBOL_GPL(ata_mode_string);
6167 EXPORT_SYMBOL_GPL(ata_id_xfermask);
6168 EXPORT_SYMBOL_GPL(ata_port_start);
6169 EXPORT_SYMBOL_GPL(ata_do_set_mode);
6170 EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6171 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
6172 EXPORT_SYMBOL_GPL(ata_port_probe);
6173 EXPORT_SYMBOL_GPL(ata_dev_disable);
6174 EXPORT_SYMBOL_GPL(sata_set_spd);
6175 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6176 EXPORT_SYMBOL_GPL(sata_link_debounce);
6177 EXPORT_SYMBOL_GPL(sata_link_resume);
6178 EXPORT_SYMBOL_GPL(ata_std_prereset);
6179 EXPORT_SYMBOL_GPL(sata_link_hardreset);
6180 EXPORT_SYMBOL_GPL(ata_std_postreset);
6181 EXPORT_SYMBOL_GPL(ata_dev_classify);
6182 EXPORT_SYMBOL_GPL(ata_dev_pair);
6183 EXPORT_SYMBOL_GPL(ata_port_disable);
6184 EXPORT_SYMBOL_GPL(ata_ratelimit);
6185 EXPORT_SYMBOL_GPL(ata_wait_register);
6186 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
6187 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
6188 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6189 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6190 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6191 EXPORT_SYMBOL_GPL(sata_scr_valid);
6192 EXPORT_SYMBOL_GPL(sata_scr_read);
6193 EXPORT_SYMBOL_GPL(sata_scr_write);
6194 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
6195 EXPORT_SYMBOL_GPL(ata_link_online);
6196 EXPORT_SYMBOL_GPL(ata_link_offline);
6198 EXPORT_SYMBOL_GPL(ata_host_suspend);
6199 EXPORT_SYMBOL_GPL(ata_host_resume);
6200 #endif /* CONFIG_PM */
6201 EXPORT_SYMBOL_GPL(ata_id_string);
6202 EXPORT_SYMBOL_GPL(ata_id_c_string);
6203 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
6205 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6206 EXPORT_SYMBOL_GPL(ata_timing_find_mode);
6207 EXPORT_SYMBOL_GPL(ata_timing_compute);
6208 EXPORT_SYMBOL_GPL(ata_timing_merge);
6209 EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
6212 EXPORT_SYMBOL_GPL(pci_test_config_bits);
6213 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6215 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
6216 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
6217 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
6218 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6219 #endif /* CONFIG_PM */
6220 #endif /* CONFIG_PCI */
6222 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
6223 EXPORT_SYMBOL_GPL(sata_pmp_std_prereset);
6224 EXPORT_SYMBOL_GPL(sata_pmp_std_hardreset);
6225 EXPORT_SYMBOL_GPL(sata_pmp_std_postreset);
6226 EXPORT_SYMBOL_GPL(sata_pmp_error_handler);
6228 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
6229 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
6230 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6231 EXPORT_SYMBOL_GPL(ata_port_desc);
6233 EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
6234 #endif /* CONFIG_PCI */
6235 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6236 EXPORT_SYMBOL_GPL(ata_link_abort);
6237 EXPORT_SYMBOL_GPL(ata_port_abort);
6238 EXPORT_SYMBOL_GPL(ata_port_freeze);
6239 EXPORT_SYMBOL_GPL(sata_async_notification);
6240 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
6241 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6242 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
6243 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6244 EXPORT_SYMBOL_GPL(ata_do_eh);
6245 EXPORT_SYMBOL_GPL(ata_std_error_handler);
6247 EXPORT_SYMBOL_GPL(ata_cable_40wire);
6248 EXPORT_SYMBOL_GPL(ata_cable_80wire);
6249 EXPORT_SYMBOL_GPL(ata_cable_unknown);
6250 EXPORT_SYMBOL_GPL(ata_cable_ignore);
6251 EXPORT_SYMBOL_GPL(ata_cable_sata);