2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/pci.h>
38 #include <linux/init.h>
39 #include <linux/list.h>
41 #include <linux/highmem.h>
42 #include <linux/spinlock.h>
43 #include <linux/blkdev.h>
44 #include <linux/delay.h>
45 #include <linux/timer.h>
46 #include <linux/interrupt.h>
47 #include <linux/completion.h>
48 #include <linux/suspend.h>
49 #include <linux/workqueue.h>
50 #include <linux/jiffies.h>
51 #include <linux/scatterlist.h>
52 #include <scsi/scsi.h>
53 #include <scsi/scsi_cmnd.h>
54 #include <scsi/scsi_host.h>
55 #include <linux/libata.h>
57 #include <asm/semaphore.h>
58 #include <asm/byteorder.h>
62 #define DRV_VERSION "2.21" /* must be exactly four chars */
65 /* debounce timing parameters in msecs { interval, duration, timeout } */
66 const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
67 const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
68 const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
70 static unsigned int ata_dev_init_params(struct ata_device *dev,
71 u16 heads, u16 sectors);
72 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
73 static unsigned int ata_dev_set_AN(struct ata_device *dev, u8 enable);
74 static void ata_dev_xfermask(struct ata_device *dev);
75 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
77 unsigned int ata_print_id = 1;
78 static struct workqueue_struct *ata_wq;
80 struct workqueue_struct *ata_aux_wq;
82 int atapi_enabled = 1;
83 module_param(atapi_enabled, int, 0444);
84 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
87 module_param(atapi_dmadir, int, 0444);
88 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
90 int atapi_passthru16 = 1;
91 module_param(atapi_passthru16, int, 0444);
92 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");
95 module_param_named(fua, libata_fua, int, 0444);
96 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
98 static int ata_ignore_hpa = 0;
99 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
100 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
102 static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
103 module_param(ata_probe_timeout, int, 0444);
104 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
106 int libata_noacpi = 1;
107 module_param_named(noacpi, libata_noacpi, int, 0444);
108 MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in suspend/resume when set");
110 MODULE_AUTHOR("Jeff Garzik");
111 MODULE_DESCRIPTION("Library module for ATA devices");
112 MODULE_LICENSE("GPL");
113 MODULE_VERSION(DRV_VERSION);
117 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
118 * @tf: Taskfile to convert
119 * @pmp: Port multiplier port
120 * @is_cmd: This FIS is for command
121 * @fis: Buffer into which data will output
123 * Converts a standard ATA taskfile to a Serial ATA
124 * FIS structure (Register - Host to Device).
127 * Inherited from caller.
129 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
131 fis[0] = 0x27; /* Register - Host to Device FIS */
132 fis[1] = pmp & 0xf; /* Port multiplier number*/
134 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
136 fis[2] = tf->command;
137 fis[3] = tf->feature;
144 fis[8] = tf->hob_lbal;
145 fis[9] = tf->hob_lbam;
146 fis[10] = tf->hob_lbah;
147 fis[11] = tf->hob_feature;
150 fis[13] = tf->hob_nsect;
161 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
162 * @fis: Buffer from which data will be input
163 * @tf: Taskfile to output
165 * Converts a serial ATA FIS structure to a standard ATA taskfile.
168 * Inherited from caller.
171 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
173 tf->command = fis[2]; /* status */
174 tf->feature = fis[3]; /* error */
181 tf->hob_lbal = fis[8];
182 tf->hob_lbam = fis[9];
183 tf->hob_lbah = fis[10];
186 tf->hob_nsect = fis[13];
189 static const u8 ata_rw_cmds[] = {
193 ATA_CMD_READ_MULTI_EXT,
194 ATA_CMD_WRITE_MULTI_EXT,
198 ATA_CMD_WRITE_MULTI_FUA_EXT,
202 ATA_CMD_PIO_READ_EXT,
203 ATA_CMD_PIO_WRITE_EXT,
216 ATA_CMD_WRITE_FUA_EXT
220 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
221 * @tf: command to examine and configure
222 * @dev: device tf belongs to
224 * Examine the device configuration and tf->flags to calculate
225 * the proper read/write commands and protocol to use.
230 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
234 int index, fua, lba48, write;
236 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
237 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
238 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
240 if (dev->flags & ATA_DFLAG_PIO) {
241 tf->protocol = ATA_PROT_PIO;
242 index = dev->multi_count ? 0 : 8;
243 } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
244 /* Unable to use DMA due to host limitation */
245 tf->protocol = ATA_PROT_PIO;
246 index = dev->multi_count ? 0 : 8;
248 tf->protocol = ATA_PROT_DMA;
252 cmd = ata_rw_cmds[index + fua + lba48 + write];
261 * ata_tf_read_block - Read block address from ATA taskfile
262 * @tf: ATA taskfile of interest
263 * @dev: ATA device @tf belongs to
268 * Read block address from @tf. This function can handle all
269 * three address formats - LBA, LBA48 and CHS. tf->protocol and
270 * flags select the address format to use.
273 * Block address read from @tf.
275 u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
279 if (tf->flags & ATA_TFLAG_LBA) {
280 if (tf->flags & ATA_TFLAG_LBA48) {
281 block |= (u64)tf->hob_lbah << 40;
282 block |= (u64)tf->hob_lbam << 32;
283 block |= tf->hob_lbal << 24;
285 block |= (tf->device & 0xf) << 24;
287 block |= tf->lbah << 16;
288 block |= tf->lbam << 8;
293 cyl = tf->lbam | (tf->lbah << 8);
294 head = tf->device & 0xf;
297 block = (cyl * dev->heads + head) * dev->sectors + sect;
304 * ata_build_rw_tf - Build ATA taskfile for given read/write request
305 * @tf: Target ATA taskfile
306 * @dev: ATA device @tf belongs to
307 * @block: Block address
308 * @n_block: Number of blocks
309 * @tf_flags: RW/FUA etc...
315 * Build ATA taskfile @tf for read/write request described by
316 * @block, @n_block, @tf_flags and @tag on @dev.
320 * 0 on success, -ERANGE if the request is too large for @dev,
321 * -EINVAL if the request is invalid.
323 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
324 u64 block, u32 n_block, unsigned int tf_flags,
327 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
328 tf->flags |= tf_flags;
330 if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
332 if (!lba_48_ok(block, n_block))
335 tf->protocol = ATA_PROT_NCQ;
336 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
338 if (tf->flags & ATA_TFLAG_WRITE)
339 tf->command = ATA_CMD_FPDMA_WRITE;
341 tf->command = ATA_CMD_FPDMA_READ;
343 tf->nsect = tag << 3;
344 tf->hob_feature = (n_block >> 8) & 0xff;
345 tf->feature = n_block & 0xff;
347 tf->hob_lbah = (block >> 40) & 0xff;
348 tf->hob_lbam = (block >> 32) & 0xff;
349 tf->hob_lbal = (block >> 24) & 0xff;
350 tf->lbah = (block >> 16) & 0xff;
351 tf->lbam = (block >> 8) & 0xff;
352 tf->lbal = block & 0xff;
355 if (tf->flags & ATA_TFLAG_FUA)
356 tf->device |= 1 << 7;
357 } else if (dev->flags & ATA_DFLAG_LBA) {
358 tf->flags |= ATA_TFLAG_LBA;
360 if (lba_28_ok(block, n_block)) {
362 tf->device |= (block >> 24) & 0xf;
363 } else if (lba_48_ok(block, n_block)) {
364 if (!(dev->flags & ATA_DFLAG_LBA48))
368 tf->flags |= ATA_TFLAG_LBA48;
370 tf->hob_nsect = (n_block >> 8) & 0xff;
372 tf->hob_lbah = (block >> 40) & 0xff;
373 tf->hob_lbam = (block >> 32) & 0xff;
374 tf->hob_lbal = (block >> 24) & 0xff;
376 /* request too large even for LBA48 */
379 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
382 tf->nsect = n_block & 0xff;
384 tf->lbah = (block >> 16) & 0xff;
385 tf->lbam = (block >> 8) & 0xff;
386 tf->lbal = block & 0xff;
388 tf->device |= ATA_LBA;
391 u32 sect, head, cyl, track;
393 /* The request -may- be too large for CHS addressing. */
394 if (!lba_28_ok(block, n_block))
397 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
400 /* Convert LBA to CHS */
401 track = (u32)block / dev->sectors;
402 cyl = track / dev->heads;
403 head = track % dev->heads;
404 sect = (u32)block % dev->sectors + 1;
406 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
407 (u32)block, track, cyl, head, sect);
409 /* Check whether the converted CHS can fit.
413 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
416 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
427 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
428 * @pio_mask: pio_mask
429 * @mwdma_mask: mwdma_mask
430 * @udma_mask: udma_mask
432 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
433 * unsigned int xfer_mask.
441 static unsigned int ata_pack_xfermask(unsigned int pio_mask,
442 unsigned int mwdma_mask,
443 unsigned int udma_mask)
445 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
446 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
447 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
451 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
452 * @xfer_mask: xfer_mask to unpack
453 * @pio_mask: resulting pio_mask
454 * @mwdma_mask: resulting mwdma_mask
455 * @udma_mask: resulting udma_mask
457 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
458 * Any NULL distination masks will be ignored.
460 static void ata_unpack_xfermask(unsigned int xfer_mask,
461 unsigned int *pio_mask,
462 unsigned int *mwdma_mask,
463 unsigned int *udma_mask)
466 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
468 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
470 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
473 static const struct ata_xfer_ent {
477 { ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
478 { ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
479 { ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
484 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
485 * @xfer_mask: xfer_mask of interest
487 * Return matching XFER_* value for @xfer_mask. Only the highest
488 * bit of @xfer_mask is considered.
494 * Matching XFER_* value, 0 if no match found.
496 static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
498 int highbit = fls(xfer_mask) - 1;
499 const struct ata_xfer_ent *ent;
501 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
502 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
503 return ent->base + highbit - ent->shift;
508 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
509 * @xfer_mode: XFER_* of interest
511 * Return matching xfer_mask for @xfer_mode.
517 * Matching xfer_mask, 0 if no match found.
519 static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
521 const struct ata_xfer_ent *ent;
523 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
524 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
525 return 1 << (ent->shift + xfer_mode - ent->base);
530 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
531 * @xfer_mode: XFER_* of interest
533 * Return matching xfer_shift for @xfer_mode.
539 * Matching xfer_shift, -1 if no match found.
541 static int ata_xfer_mode2shift(unsigned int xfer_mode)
543 const struct ata_xfer_ent *ent;
545 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
546 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
552 * ata_mode_string - convert xfer_mask to string
553 * @xfer_mask: mask of bits supported; only highest bit counts.
555 * Determine string which represents the highest speed
556 * (highest bit in @modemask).
562 * Constant C string representing highest speed listed in
563 * @mode_mask, or the constant C string "<n/a>".
565 static const char *ata_mode_string(unsigned int xfer_mask)
567 static const char * const xfer_mode_str[] = {
591 highbit = fls(xfer_mask) - 1;
592 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
593 return xfer_mode_str[highbit];
597 static const char *sata_spd_string(unsigned int spd)
599 static const char * const spd_str[] = {
604 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
606 return spd_str[spd - 1];
609 void ata_dev_disable(struct ata_device *dev)
611 if (ata_dev_enabled(dev)) {
612 if (ata_msg_drv(dev->link->ap))
613 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
614 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
621 * ata_devchk - PATA device presence detection
622 * @ap: ATA channel to examine
623 * @device: Device to examine (starting at zero)
625 * This technique was originally described in
626 * Hale Landis's ATADRVR (www.ata-atapi.com), and
627 * later found its way into the ATA/ATAPI spec.
629 * Write a pattern to the ATA shadow registers,
630 * and if a device is present, it will respond by
631 * correctly storing and echoing back the
632 * ATA shadow register contents.
638 static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
640 struct ata_ioports *ioaddr = &ap->ioaddr;
643 ap->ops->dev_select(ap, device);
645 iowrite8(0x55, ioaddr->nsect_addr);
646 iowrite8(0xaa, ioaddr->lbal_addr);
648 iowrite8(0xaa, ioaddr->nsect_addr);
649 iowrite8(0x55, ioaddr->lbal_addr);
651 iowrite8(0x55, ioaddr->nsect_addr);
652 iowrite8(0xaa, ioaddr->lbal_addr);
654 nsect = ioread8(ioaddr->nsect_addr);
655 lbal = ioread8(ioaddr->lbal_addr);
657 if ((nsect == 0x55) && (lbal == 0xaa))
658 return 1; /* we found a device */
660 return 0; /* nothing found */
664 * ata_dev_classify - determine device type based on ATA-spec signature
665 * @tf: ATA taskfile register set for device to be identified
667 * Determine from taskfile register contents whether a device is
668 * ATA or ATAPI, as per "Signature and persistence" section
669 * of ATA/PI spec (volume 1, sect 5.14).
675 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
676 * the event of failure.
679 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
681 /* Apple's open source Darwin code hints that some devices only
682 * put a proper signature into the LBA mid/high registers,
683 * So, we only check those. It's sufficient for uniqueness.
686 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
687 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
688 DPRINTK("found ATA device by sig\n");
692 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
693 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
694 DPRINTK("found ATAPI device by sig\n");
695 return ATA_DEV_ATAPI;
698 DPRINTK("unknown device\n");
699 return ATA_DEV_UNKNOWN;
703 * ata_dev_try_classify - Parse returned ATA device signature
704 * @ap: ATA channel to examine
705 * @device: Device to examine (starting at zero)
706 * @r_err: Value of error register on completion
708 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
709 * an ATA/ATAPI-defined set of values is placed in the ATA
710 * shadow registers, indicating the results of device detection
713 * Select the ATA device, and read the values from the ATA shadow
714 * registers. Then parse according to the Error register value,
715 * and the spec-defined values examined by ata_dev_classify().
721 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
725 ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
727 struct ata_taskfile tf;
731 ap->ops->dev_select(ap, device);
733 memset(&tf, 0, sizeof(tf));
735 ap->ops->tf_read(ap, &tf);
740 /* see if device passed diags: if master then continue and warn later */
741 if (err == 0 && device == 0)
742 /* diagnostic fail : do nothing _YET_ */
743 ap->link.device[device].horkage |= ATA_HORKAGE_DIAGNOSTIC;
746 else if ((device == 0) && (err == 0x81))
751 /* determine if device is ATA or ATAPI */
752 class = ata_dev_classify(&tf);
754 if (class == ATA_DEV_UNKNOWN)
756 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
762 * ata_id_string - Convert IDENTIFY DEVICE page into string
763 * @id: IDENTIFY DEVICE results we will examine
764 * @s: string into which data is output
765 * @ofs: offset into identify device page
766 * @len: length of string to return. must be an even number.
768 * The strings in the IDENTIFY DEVICE page are broken up into
769 * 16-bit chunks. Run through the string, and output each
770 * 8-bit chunk linearly, regardless of platform.
776 void ata_id_string(const u16 *id, unsigned char *s,
777 unsigned int ofs, unsigned int len)
796 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
797 * @id: IDENTIFY DEVICE results we will examine
798 * @s: string into which data is output
799 * @ofs: offset into identify device page
800 * @len: length of string to return. must be an odd number.
802 * This function is identical to ata_id_string except that it
803 * trims trailing spaces and terminates the resulting string with
804 * null. @len must be actual maximum length (even number) + 1.
809 void ata_id_c_string(const u16 *id, unsigned char *s,
810 unsigned int ofs, unsigned int len)
816 ata_id_string(id, s, ofs, len - 1);
818 p = s + strnlen(s, len - 1);
819 while (p > s && p[-1] == ' ')
824 static u64 ata_id_n_sectors(const u16 *id)
826 if (ata_id_has_lba(id)) {
827 if (ata_id_has_lba48(id))
828 return ata_id_u64(id, 100);
830 return ata_id_u32(id, 60);
832 if (ata_id_current_chs_valid(id))
833 return ata_id_u32(id, 57);
835 return id[1] * id[3] * id[6];
839 static u64 ata_tf_to_lba48(struct ata_taskfile *tf)
843 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
844 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
845 sectors |= (tf->hob_lbal & 0xff) << 24;
846 sectors |= (tf->lbah & 0xff) << 16;
847 sectors |= (tf->lbam & 0xff) << 8;
848 sectors |= (tf->lbal & 0xff);
853 static u64 ata_tf_to_lba(struct ata_taskfile *tf)
857 sectors |= (tf->device & 0x0f) << 24;
858 sectors |= (tf->lbah & 0xff) << 16;
859 sectors |= (tf->lbam & 0xff) << 8;
860 sectors |= (tf->lbal & 0xff);
866 * ata_read_native_max_address_ext - LBA48 native max query
867 * @dev: Device to query
869 * Perform an LBA48 size query upon the device in question. Return the
870 * actual LBA48 size or zero if the command fails.
873 static u64 ata_read_native_max_address_ext(struct ata_device *dev)
876 struct ata_taskfile tf;
878 ata_tf_init(dev, &tf);
880 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
881 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | ATA_TFLAG_ISADDR;
882 tf.protocol |= ATA_PROT_NODATA;
885 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
889 return ata_tf_to_lba48(&tf);
893 * ata_read_native_max_address - LBA28 native max query
894 * @dev: Device to query
896 * Performa an LBA28 size query upon the device in question. Return the
897 * actual LBA28 size or zero if the command fails.
900 static u64 ata_read_native_max_address(struct ata_device *dev)
903 struct ata_taskfile tf;
905 ata_tf_init(dev, &tf);
907 tf.command = ATA_CMD_READ_NATIVE_MAX;
908 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
909 tf.protocol |= ATA_PROT_NODATA;
912 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
916 return ata_tf_to_lba(&tf);
920 * ata_set_native_max_address_ext - LBA48 native max set
921 * @dev: Device to query
922 * @new_sectors: new max sectors value to set for the device
924 * Perform an LBA48 size set max upon the device in question. Return the
925 * actual LBA48 size or zero if the command fails.
928 static u64 ata_set_native_max_address_ext(struct ata_device *dev, u64 new_sectors)
931 struct ata_taskfile tf;
935 ata_tf_init(dev, &tf);
937 tf.command = ATA_CMD_SET_MAX_EXT;
938 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | ATA_TFLAG_ISADDR;
939 tf.protocol |= ATA_PROT_NODATA;
942 tf.lbal = (new_sectors >> 0) & 0xff;
943 tf.lbam = (new_sectors >> 8) & 0xff;
944 tf.lbah = (new_sectors >> 16) & 0xff;
946 tf.hob_lbal = (new_sectors >> 24) & 0xff;
947 tf.hob_lbam = (new_sectors >> 32) & 0xff;
948 tf.hob_lbah = (new_sectors >> 40) & 0xff;
950 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
954 return ata_tf_to_lba48(&tf);
958 * ata_set_native_max_address - LBA28 native max set
959 * @dev: Device to query
960 * @new_sectors: new max sectors value to set for the device
962 * Perform an LBA28 size set max upon the device in question. Return the
963 * actual LBA28 size or zero if the command fails.
966 static u64 ata_set_native_max_address(struct ata_device *dev, u64 new_sectors)
969 struct ata_taskfile tf;
973 ata_tf_init(dev, &tf);
975 tf.command = ATA_CMD_SET_MAX;
976 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
977 tf.protocol |= ATA_PROT_NODATA;
979 tf.lbal = (new_sectors >> 0) & 0xff;
980 tf.lbam = (new_sectors >> 8) & 0xff;
981 tf.lbah = (new_sectors >> 16) & 0xff;
982 tf.device |= ((new_sectors >> 24) & 0x0f) | 0x40;
984 err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
988 return ata_tf_to_lba(&tf);
992 * ata_hpa_resize - Resize a device with an HPA set
993 * @dev: Device to resize
995 * Read the size of an LBA28 or LBA48 disk with HPA features and resize
996 * it if required to the full size of the media. The caller must check
997 * the drive has the HPA feature set enabled.
1000 static u64 ata_hpa_resize(struct ata_device *dev)
1002 u64 sectors = dev->n_sectors;
1005 if (ata_id_has_lba48(dev->id))
1006 hpa_sectors = ata_read_native_max_address_ext(dev);
1008 hpa_sectors = ata_read_native_max_address(dev);
1010 if (hpa_sectors > sectors) {
1011 ata_dev_printk(dev, KERN_INFO,
1012 "Host Protected Area detected:\n"
1013 "\tcurrent size: %lld sectors\n"
1014 "\tnative size: %lld sectors\n",
1015 (long long)sectors, (long long)hpa_sectors);
1017 if (ata_ignore_hpa) {
1018 if (ata_id_has_lba48(dev->id))
1019 hpa_sectors = ata_set_native_max_address_ext(dev, hpa_sectors);
1021 hpa_sectors = ata_set_native_max_address(dev,
1025 ata_dev_printk(dev, KERN_INFO, "native size "
1026 "increased to %lld sectors\n",
1027 (long long)hpa_sectors);
1031 } else if (hpa_sectors < sectors)
1032 ata_dev_printk(dev, KERN_WARNING, "%s 1: hpa sectors (%lld) "
1033 "is smaller than sectors (%lld)\n", __FUNCTION__,
1034 (long long)hpa_sectors, (long long)sectors);
1040 * ata_id_to_dma_mode - Identify DMA mode from id block
1041 * @dev: device to identify
1042 * @unknown: mode to assume if we cannot tell
1044 * Set up the timing values for the device based upon the identify
1045 * reported values for the DMA mode. This function is used by drivers
1046 * which rely upon firmware configured modes, but wish to report the
1047 * mode correctly when possible.
1049 * In addition we emit similarly formatted messages to the default
1050 * ata_dev_set_mode handler, in order to provide consistency of
1054 void ata_id_to_dma_mode(struct ata_device *dev, u8 unknown)
1059 /* Pack the DMA modes */
1060 mask = ((dev->id[63] >> 8) << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA;
1061 if (dev->id[53] & 0x04)
1062 mask |= ((dev->id[88] >> 8) << ATA_SHIFT_UDMA) & ATA_MASK_UDMA;
1064 /* Select the mode in use */
1065 mode = ata_xfer_mask2mode(mask);
1068 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
1069 ata_mode_string(mask));
1071 /* SWDMA perhaps ? */
1073 ata_dev_printk(dev, KERN_INFO, "configured for DMA\n");
1076 /* Configure the device reporting */
1077 dev->xfer_mode = mode;
1078 dev->xfer_shift = ata_xfer_mode2shift(mode);
1082 * ata_noop_dev_select - Select device 0/1 on ATA bus
1083 * @ap: ATA channel to manipulate
1084 * @device: ATA device (numbered from zero) to select
1086 * This function performs no actual function.
1088 * May be used as the dev_select() entry in ata_port_operations.
1093 void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
1099 * ata_std_dev_select - Select device 0/1 on ATA bus
1100 * @ap: ATA channel to manipulate
1101 * @device: ATA device (numbered from zero) to select
1103 * Use the method defined in the ATA specification to
1104 * make either device 0, or device 1, active on the
1105 * ATA channel. Works with both PIO and MMIO.
1107 * May be used as the dev_select() entry in ata_port_operations.
1113 void ata_std_dev_select (struct ata_port *ap, unsigned int device)
1118 tmp = ATA_DEVICE_OBS;
1120 tmp = ATA_DEVICE_OBS | ATA_DEV1;
1122 iowrite8(tmp, ap->ioaddr.device_addr);
1123 ata_pause(ap); /* needed; also flushes, for mmio */
1127 * ata_dev_select - Select device 0/1 on ATA bus
1128 * @ap: ATA channel to manipulate
1129 * @device: ATA device (numbered from zero) to select
1130 * @wait: non-zero to wait for Status register BSY bit to clear
1131 * @can_sleep: non-zero if context allows sleeping
1133 * Use the method defined in the ATA specification to
1134 * make either device 0, or device 1, active on the
1137 * This is a high-level version of ata_std_dev_select(),
1138 * which additionally provides the services of inserting
1139 * the proper pauses and status polling, where needed.
1145 void ata_dev_select(struct ata_port *ap, unsigned int device,
1146 unsigned int wait, unsigned int can_sleep)
1148 if (ata_msg_probe(ap))
1149 ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
1150 "device %u, wait %u\n", device, wait);
1155 ap->ops->dev_select(ap, device);
1158 if (can_sleep && ap->link.device[device].class == ATA_DEV_ATAPI)
1165 * ata_dump_id - IDENTIFY DEVICE info debugging output
1166 * @id: IDENTIFY DEVICE page to dump
1168 * Dump selected 16-bit words from the given IDENTIFY DEVICE
1175 static inline void ata_dump_id(const u16 *id)
1177 DPRINTK("49==0x%04x "
1187 DPRINTK("80==0x%04x "
1197 DPRINTK("88==0x%04x "
1204 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1205 * @id: IDENTIFY data to compute xfer mask from
1207 * Compute the xfermask for this device. This is not as trivial
1208 * as it seems if we must consider early devices correctly.
1210 * FIXME: pre IDE drive timing (do we care ?).
1218 static unsigned int ata_id_xfermask(const u16 *id)
1220 unsigned int pio_mask, mwdma_mask, udma_mask;
1222 /* Usual case. Word 53 indicates word 64 is valid */
1223 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1224 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1228 /* If word 64 isn't valid then Word 51 high byte holds
1229 * the PIO timing number for the maximum. Turn it into
1232 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1233 if (mode < 5) /* Valid PIO range */
1234 pio_mask = (2 << mode) - 1;
1238 /* But wait.. there's more. Design your standards by
1239 * committee and you too can get a free iordy field to
1240 * process. However its the speeds not the modes that
1241 * are supported... Note drivers using the timing API
1242 * will get this right anyway
1246 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1248 if (ata_id_is_cfa(id)) {
1250 * Process compact flash extended modes
1252 int pio = id[163] & 0x7;
1253 int dma = (id[163] >> 3) & 7;
1256 pio_mask |= (1 << 5);
1258 pio_mask |= (1 << 6);
1260 mwdma_mask |= (1 << 3);
1262 mwdma_mask |= (1 << 4);
1266 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1267 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1269 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1273 * ata_port_queue_task - Queue port_task
1274 * @ap: The ata_port to queue port_task for
1275 * @fn: workqueue function to be scheduled
1276 * @data: data for @fn to use
1277 * @delay: delay time for workqueue function
1279 * Schedule @fn(@data) for execution after @delay jiffies using
1280 * port_task. There is one port_task per port and it's the
1281 * user(low level driver)'s responsibility to make sure that only
1282 * one task is active at any given time.
1284 * libata core layer takes care of synchronization between
1285 * port_task and EH. ata_port_queue_task() may be ignored for EH
1289 * Inherited from caller.
1291 void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
1292 unsigned long delay)
1294 PREPARE_DELAYED_WORK(&ap->port_task, fn);
1295 ap->port_task_data = data;
1297 /* may fail if ata_port_flush_task() in progress */
1298 queue_delayed_work(ata_wq, &ap->port_task, delay);
1302 * ata_port_flush_task - Flush port_task
1303 * @ap: The ata_port to flush port_task for
1305 * After this function completes, port_task is guranteed not to
1306 * be running or scheduled.
1309 * Kernel thread context (may sleep)
1311 void ata_port_flush_task(struct ata_port *ap)
1315 cancel_rearming_delayed_work(&ap->port_task);
1317 if (ata_msg_ctl(ap))
1318 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
1321 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1323 struct completion *waiting = qc->private_data;
1329 * ata_exec_internal_sg - execute libata internal command
1330 * @dev: Device to which the command is sent
1331 * @tf: Taskfile registers for the command and the result
1332 * @cdb: CDB for packet command
1333 * @dma_dir: Data tranfer direction of the command
1334 * @sg: sg list for the data buffer of the command
1335 * @n_elem: Number of sg entries
1337 * Executes libata internal command with timeout. @tf contains
1338 * command on entry and result on return. Timeout and error
1339 * conditions are reported via return value. No recovery action
1340 * is taken after a command times out. It's caller's duty to
1341 * clean up after timeout.
1344 * None. Should be called with kernel context, might sleep.
1347 * Zero on success, AC_ERR_* mask on failure
1349 unsigned ata_exec_internal_sg(struct ata_device *dev,
1350 struct ata_taskfile *tf, const u8 *cdb,
1351 int dma_dir, struct scatterlist *sg,
1352 unsigned int n_elem)
1354 struct ata_link *link = dev->link;
1355 struct ata_port *ap = link->ap;
1356 u8 command = tf->command;
1357 struct ata_queued_cmd *qc;
1358 unsigned int tag, preempted_tag;
1359 u32 preempted_sactive, preempted_qc_active;
1360 DECLARE_COMPLETION_ONSTACK(wait);
1361 unsigned long flags;
1362 unsigned int err_mask;
1365 spin_lock_irqsave(ap->lock, flags);
1367 /* no internal command while frozen */
1368 if (ap->pflags & ATA_PFLAG_FROZEN) {
1369 spin_unlock_irqrestore(ap->lock, flags);
1370 return AC_ERR_SYSTEM;
1373 /* initialize internal qc */
1375 /* XXX: Tag 0 is used for drivers with legacy EH as some
1376 * drivers choke if any other tag is given. This breaks
1377 * ata_tag_internal() test for those drivers. Don't use new
1378 * EH stuff without converting to it.
1380 if (ap->ops->error_handler)
1381 tag = ATA_TAG_INTERNAL;
1385 if (test_and_set_bit(tag, &ap->qc_allocated))
1387 qc = __ata_qc_from_tag(ap, tag);
1395 preempted_tag = link->active_tag;
1396 preempted_sactive = link->sactive;
1397 preempted_qc_active = ap->qc_active;
1398 link->active_tag = ATA_TAG_POISON;
1402 /* prepare & issue qc */
1405 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1406 qc->flags |= ATA_QCFLAG_RESULT_TF;
1407 qc->dma_dir = dma_dir;
1408 if (dma_dir != DMA_NONE) {
1409 unsigned int i, buflen = 0;
1411 for (i = 0; i < n_elem; i++)
1412 buflen += sg[i].length;
1414 ata_sg_init(qc, sg, n_elem);
1415 qc->nbytes = buflen;
1418 qc->private_data = &wait;
1419 qc->complete_fn = ata_qc_complete_internal;
1423 spin_unlock_irqrestore(ap->lock, flags);
1425 rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1427 ata_port_flush_task(ap);
1430 spin_lock_irqsave(ap->lock, flags);
1432 /* We're racing with irq here. If we lose, the
1433 * following test prevents us from completing the qc
1434 * twice. If we win, the port is frozen and will be
1435 * cleaned up by ->post_internal_cmd().
1437 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1438 qc->err_mask |= AC_ERR_TIMEOUT;
1440 if (ap->ops->error_handler)
1441 ata_port_freeze(ap);
1443 ata_qc_complete(qc);
1445 if (ata_msg_warn(ap))
1446 ata_dev_printk(dev, KERN_WARNING,
1447 "qc timeout (cmd 0x%x)\n", command);
1450 spin_unlock_irqrestore(ap->lock, flags);
1453 /* do post_internal_cmd */
1454 if (ap->ops->post_internal_cmd)
1455 ap->ops->post_internal_cmd(qc);
1457 /* perform minimal error analysis */
1458 if (qc->flags & ATA_QCFLAG_FAILED) {
1459 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1460 qc->err_mask |= AC_ERR_DEV;
1463 qc->err_mask |= AC_ERR_OTHER;
1465 if (qc->err_mask & ~AC_ERR_OTHER)
1466 qc->err_mask &= ~AC_ERR_OTHER;
1470 spin_lock_irqsave(ap->lock, flags);
1472 *tf = qc->result_tf;
1473 err_mask = qc->err_mask;
1476 link->active_tag = preempted_tag;
1477 link->sactive = preempted_sactive;
1478 ap->qc_active = preempted_qc_active;
1480 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1481 * Until those drivers are fixed, we detect the condition
1482 * here, fail the command with AC_ERR_SYSTEM and reenable the
1485 * Note that this doesn't change any behavior as internal
1486 * command failure results in disabling the device in the
1487 * higher layer for LLDDs without new reset/EH callbacks.
1489 * Kill the following code as soon as those drivers are fixed.
1491 if (ap->flags & ATA_FLAG_DISABLED) {
1492 err_mask |= AC_ERR_SYSTEM;
1496 spin_unlock_irqrestore(ap->lock, flags);
1502 * ata_exec_internal - execute libata internal command
1503 * @dev: Device to which the command is sent
1504 * @tf: Taskfile registers for the command and the result
1505 * @cdb: CDB for packet command
1506 * @dma_dir: Data tranfer direction of the command
1507 * @buf: Data buffer of the command
1508 * @buflen: Length of data buffer
1510 * Wrapper around ata_exec_internal_sg() which takes simple
1511 * buffer instead of sg list.
1514 * None. Should be called with kernel context, might sleep.
1517 * Zero on success, AC_ERR_* mask on failure
1519 unsigned ata_exec_internal(struct ata_device *dev,
1520 struct ata_taskfile *tf, const u8 *cdb,
1521 int dma_dir, void *buf, unsigned int buflen)
1523 struct scatterlist *psg = NULL, sg;
1524 unsigned int n_elem = 0;
1526 if (dma_dir != DMA_NONE) {
1528 sg_init_one(&sg, buf, buflen);
1533 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1537 * ata_do_simple_cmd - execute simple internal command
1538 * @dev: Device to which the command is sent
1539 * @cmd: Opcode to execute
1541 * Execute a 'simple' command, that only consists of the opcode
1542 * 'cmd' itself, without filling any other registers
1545 * Kernel thread context (may sleep).
1548 * Zero on success, AC_ERR_* mask on failure
1550 unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1552 struct ata_taskfile tf;
1554 ata_tf_init(dev, &tf);
1557 tf.flags |= ATA_TFLAG_DEVICE;
1558 tf.protocol = ATA_PROT_NODATA;
1560 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1564 * ata_pio_need_iordy - check if iordy needed
1567 * Check if the current speed of the device requires IORDY. Used
1568 * by various controllers for chip configuration.
1571 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1573 /* Controller doesn't support IORDY. Probably a pointless check
1574 as the caller should know this */
1575 if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1577 /* PIO3 and higher it is mandatory */
1578 if (adev->pio_mode > XFER_PIO_2)
1580 /* We turn it on when possible */
1581 if (ata_id_has_iordy(adev->id))
1587 * ata_pio_mask_no_iordy - Return the non IORDY mask
1590 * Compute the highest mode possible if we are not using iordy. Return
1591 * -1 if no iordy mode is available.
1594 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1596 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1597 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1598 u16 pio = adev->id[ATA_ID_EIDE_PIO];
1599 /* Is the speed faster than the drive allows non IORDY ? */
1601 /* This is cycle times not frequency - watch the logic! */
1602 if (pio > 240) /* PIO2 is 240nS per cycle */
1603 return 3 << ATA_SHIFT_PIO;
1604 return 7 << ATA_SHIFT_PIO;
1607 return 3 << ATA_SHIFT_PIO;
1611 * ata_dev_read_id - Read ID data from the specified device
1612 * @dev: target device
1613 * @p_class: pointer to class of the target device (may be changed)
1614 * @flags: ATA_READID_* flags
1615 * @id: buffer to read IDENTIFY data into
1617 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1618 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1619 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1620 * for pre-ATA4 drives.
1622 * FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1623 * now we abort if we hit that case.
1626 * Kernel thread context (may sleep)
1629 * 0 on success, -errno otherwise.
1631 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1632 unsigned int flags, u16 *id)
1634 struct ata_port *ap = dev->link->ap;
1635 unsigned int class = *p_class;
1636 struct ata_taskfile tf;
1637 unsigned int err_mask = 0;
1639 int may_fallback = 1, tried_spinup = 0;
1642 if (ata_msg_ctl(ap))
1643 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
1645 ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
1647 ata_tf_init(dev, &tf);
1651 tf.command = ATA_CMD_ID_ATA;
1654 tf.command = ATA_CMD_ID_ATAPI;
1658 reason = "unsupported class";
1662 tf.protocol = ATA_PROT_PIO;
1664 /* Some devices choke if TF registers contain garbage. Make
1665 * sure those are properly initialized.
1667 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1669 /* Device presence detection is unreliable on some
1670 * controllers. Always poll IDENTIFY if available.
1672 tf.flags |= ATA_TFLAG_POLLING;
1674 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1675 id, sizeof(id[0]) * ATA_ID_WORDS);
1677 if (err_mask & AC_ERR_NODEV_HINT) {
1678 DPRINTK("ata%u.%d: NODEV after polling detection\n",
1679 ap->print_id, dev->devno);
1683 /* Device or controller might have reported the wrong
1684 * device class. Give a shot at the other IDENTIFY if
1685 * the current one is aborted by the device.
1688 (err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
1691 if (class == ATA_DEV_ATA)
1692 class = ATA_DEV_ATAPI;
1694 class = ATA_DEV_ATA;
1699 reason = "I/O error";
1703 /* Falling back doesn't make sense if ID data was read
1704 * successfully at least once.
1708 swap_buf_le16(id, ATA_ID_WORDS);
1712 reason = "device reports invalid type";
1714 if (class == ATA_DEV_ATA) {
1715 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1718 if (ata_id_is_ata(id))
1722 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
1725 * Drive powered-up in standby mode, and requires a specific
1726 * SET_FEATURES spin-up subcommand before it will accept
1727 * anything other than the original IDENTIFY command.
1729 ata_tf_init(dev, &tf);
1730 tf.command = ATA_CMD_SET_FEATURES;
1731 tf.feature = SETFEATURES_SPINUP;
1732 tf.protocol = ATA_PROT_NODATA;
1733 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1734 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1735 if (err_mask && id[2] != 0x738c) {
1737 reason = "SPINUP failed";
1741 * If the drive initially returned incomplete IDENTIFY info,
1742 * we now must reissue the IDENTIFY command.
1744 if (id[2] == 0x37c8)
1748 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1750 * The exact sequence expected by certain pre-ATA4 drives is:
1752 * IDENTIFY (optional in early ATA)
1753 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
1755 * Some drives were very specific about that exact sequence.
1757 * Note that ATA4 says lba is mandatory so the second check
1758 * shoud never trigger.
1760 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1761 err_mask = ata_dev_init_params(dev, id[3], id[6]);
1764 reason = "INIT_DEV_PARAMS failed";
1768 /* current CHS translation info (id[53-58]) might be
1769 * changed. reread the identify device info.
1771 flags &= ~ATA_READID_POSTRESET;
1781 if (ata_msg_warn(ap))
1782 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
1783 "(%s, err_mask=0x%x)\n", reason, err_mask);
1787 static inline u8 ata_dev_knobble(struct ata_device *dev)
1789 struct ata_port *ap = dev->link->ap;
1790 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1793 static void ata_dev_config_ncq(struct ata_device *dev,
1794 char *desc, size_t desc_sz)
1796 struct ata_port *ap = dev->link->ap;
1797 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
1799 if (!ata_id_has_ncq(dev->id)) {
1803 if (dev->horkage & ATA_HORKAGE_NONCQ) {
1804 snprintf(desc, desc_sz, "NCQ (not used)");
1807 if (ap->flags & ATA_FLAG_NCQ) {
1808 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1809 dev->flags |= ATA_DFLAG_NCQ;
1812 if (hdepth >= ddepth)
1813 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
1815 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
1819 * ata_dev_configure - Configure the specified ATA/ATAPI device
1820 * @dev: Target device to configure
1822 * Configure @dev according to @dev->id. Generic and low-level
1823 * driver specific fixups are also applied.
1826 * Kernel thread context (may sleep)
1829 * 0 on success, -errno otherwise
1831 int ata_dev_configure(struct ata_device *dev)
1833 struct ata_port *ap = dev->link->ap;
1834 struct ata_eh_context *ehc = &dev->link->eh_context;
1835 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1836 const u16 *id = dev->id;
1837 unsigned int xfer_mask;
1838 char revbuf[7]; /* XYZ-99\0 */
1839 char fwrevbuf[ATA_ID_FW_REV_LEN+1];
1840 char modelbuf[ATA_ID_PROD_LEN+1];
1843 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
1844 ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
1849 if (ata_msg_probe(ap))
1850 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
1853 dev->horkage |= ata_dev_blacklisted(dev);
1855 /* let ACPI work its magic */
1856 rc = ata_acpi_on_devcfg(dev);
1860 /* print device capabilities */
1861 if (ata_msg_probe(ap))
1862 ata_dev_printk(dev, KERN_DEBUG,
1863 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
1864 "85:%04x 86:%04x 87:%04x 88:%04x\n",
1866 id[49], id[82], id[83], id[84],
1867 id[85], id[86], id[87], id[88]);
1869 /* initialize to-be-configured parameters */
1870 dev->flags &= ~ATA_DFLAG_CFG_MASK;
1871 dev->max_sectors = 0;
1879 * common ATA, ATAPI feature tests
1882 /* find max transfer mode; for printk only */
1883 xfer_mask = ata_id_xfermask(id);
1885 if (ata_msg_probe(ap))
1888 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
1889 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
1892 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
1895 /* ATA-specific feature tests */
1896 if (dev->class == ATA_DEV_ATA) {
1897 if (ata_id_is_cfa(id)) {
1898 if (id[162] & 1) /* CPRM may make this media unusable */
1899 ata_dev_printk(dev, KERN_WARNING,
1900 "supports DRM functions and may "
1901 "not be fully accessable.\n");
1902 snprintf(revbuf, 7, "CFA");
1905 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
1907 dev->n_sectors = ata_id_n_sectors(id);
1909 if (dev->id[59] & 0x100)
1910 dev->multi_count = dev->id[59] & 0xff;
1912 if (ata_id_has_lba(id)) {
1913 const char *lba_desc;
1917 dev->flags |= ATA_DFLAG_LBA;
1918 if (ata_id_has_lba48(id)) {
1919 dev->flags |= ATA_DFLAG_LBA48;
1922 if (dev->n_sectors >= (1UL << 28) &&
1923 ata_id_has_flush_ext(id))
1924 dev->flags |= ATA_DFLAG_FLUSH_EXT;
1927 if (!(dev->horkage & ATA_HORKAGE_BROKEN_HPA) &&
1928 ata_id_hpa_enabled(dev->id))
1929 dev->n_sectors = ata_hpa_resize(dev);
1932 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
1934 /* print device info to dmesg */
1935 if (ata_msg_drv(ap) && print_info) {
1936 ata_dev_printk(dev, KERN_INFO,
1937 "%s: %s, %s, max %s\n",
1938 revbuf, modelbuf, fwrevbuf,
1939 ata_mode_string(xfer_mask));
1940 ata_dev_printk(dev, KERN_INFO,
1941 "%Lu sectors, multi %u: %s %s\n",
1942 (unsigned long long)dev->n_sectors,
1943 dev->multi_count, lba_desc, ncq_desc);
1948 /* Default translation */
1949 dev->cylinders = id[1];
1951 dev->sectors = id[6];
1953 if (ata_id_current_chs_valid(id)) {
1954 /* Current CHS translation is valid. */
1955 dev->cylinders = id[54];
1956 dev->heads = id[55];
1957 dev->sectors = id[56];
1960 /* print device info to dmesg */
1961 if (ata_msg_drv(ap) && print_info) {
1962 ata_dev_printk(dev, KERN_INFO,
1963 "%s: %s, %s, max %s\n",
1964 revbuf, modelbuf, fwrevbuf,
1965 ata_mode_string(xfer_mask));
1966 ata_dev_printk(dev, KERN_INFO,
1967 "%Lu sectors, multi %u, CHS %u/%u/%u\n",
1968 (unsigned long long)dev->n_sectors,
1969 dev->multi_count, dev->cylinders,
1970 dev->heads, dev->sectors);
1977 /* ATAPI-specific feature tests */
1978 else if (dev->class == ATA_DEV_ATAPI) {
1979 char *cdb_intr_string = "";
1981 rc = atapi_cdb_len(id);
1982 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1983 if (ata_msg_warn(ap))
1984 ata_dev_printk(dev, KERN_WARNING,
1985 "unsupported CDB len\n");
1989 dev->cdb_len = (unsigned int) rc;
1992 * check to see if this ATAPI device supports
1993 * Asynchronous Notification
1995 if ((ap->flags & ATA_FLAG_AN) && ata_id_has_AN(id)) {
1997 /* issue SET feature command to turn this on */
1998 err = ata_dev_set_AN(dev, SETFEATURES_SATA_ENABLE);
2000 ata_dev_printk(dev, KERN_ERR,
2001 "unable to set AN, err %x\n",
2004 dev->flags |= ATA_DFLAG_AN;
2007 if (ata_id_cdb_intr(dev->id)) {
2008 dev->flags |= ATA_DFLAG_CDB_INTR;
2009 cdb_intr_string = ", CDB intr";
2012 /* print device info to dmesg */
2013 if (ata_msg_drv(ap) && print_info)
2014 ata_dev_printk(dev, KERN_INFO,
2015 "ATAPI: %s, %s, max %s%s\n",
2017 ata_mode_string(xfer_mask),
2021 /* determine max_sectors */
2022 dev->max_sectors = ATA_MAX_SECTORS;
2023 if (dev->flags & ATA_DFLAG_LBA48)
2024 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2026 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2027 /* Let the user know. We don't want to disallow opens for
2028 rescue purposes, or in case the vendor is just a blithering
2031 ata_dev_printk(dev, KERN_WARNING,
2032 "Drive reports diagnostics failure. This may indicate a drive\n");
2033 ata_dev_printk(dev, KERN_WARNING,
2034 "fault or invalid emulation. Contact drive vendor for information.\n");
2038 /* limit bridge transfers to udma5, 200 sectors */
2039 if (ata_dev_knobble(dev)) {
2040 if (ata_msg_drv(ap) && print_info)
2041 ata_dev_printk(dev, KERN_INFO,
2042 "applying bridge limits\n");
2043 dev->udma_mask &= ATA_UDMA5;
2044 dev->max_sectors = ATA_MAX_SECTORS;
2047 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2048 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2051 if (ap->ops->dev_config)
2052 ap->ops->dev_config(dev);
2054 if (ata_msg_probe(ap))
2055 ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
2056 __FUNCTION__, ata_chk_status(ap));
2060 if (ata_msg_probe(ap))
2061 ata_dev_printk(dev, KERN_DEBUG,
2062 "%s: EXIT, err\n", __FUNCTION__);
2067 * ata_cable_40wire - return 40 wire cable type
2070 * Helper method for drivers which want to hardwire 40 wire cable
2074 int ata_cable_40wire(struct ata_port *ap)
2076 return ATA_CBL_PATA40;
2080 * ata_cable_80wire - return 80 wire cable type
2083 * Helper method for drivers which want to hardwire 80 wire cable
2087 int ata_cable_80wire(struct ata_port *ap)
2089 return ATA_CBL_PATA80;
2093 * ata_cable_unknown - return unknown PATA cable.
2096 * Helper method for drivers which have no PATA cable detection.
2099 int ata_cable_unknown(struct ata_port *ap)
2101 return ATA_CBL_PATA_UNK;
2105 * ata_cable_sata - return SATA cable type
2108 * Helper method for drivers which have SATA cables
2111 int ata_cable_sata(struct ata_port *ap)
2113 return ATA_CBL_SATA;
2117 * ata_bus_probe - Reset and probe ATA bus
2120 * Master ATA bus probing function. Initiates a hardware-dependent
2121 * bus reset, then attempts to identify any devices found on
2125 * PCI/etc. bus probe sem.
2128 * Zero on success, negative errno otherwise.
2131 int ata_bus_probe(struct ata_port *ap)
2133 unsigned int classes[ATA_MAX_DEVICES];
2134 int tries[ATA_MAX_DEVICES];
2136 struct ata_device *dev;
2140 ata_link_for_each_dev(dev, &ap->link)
2141 tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2144 /* reset and determine device classes */
2145 ap->ops->phy_reset(ap);
2147 ata_link_for_each_dev(dev, &ap->link) {
2148 if (!(ap->flags & ATA_FLAG_DISABLED) &&
2149 dev->class != ATA_DEV_UNKNOWN)
2150 classes[dev->devno] = dev->class;
2152 classes[dev->devno] = ATA_DEV_NONE;
2154 dev->class = ATA_DEV_UNKNOWN;
2159 /* after the reset the device state is PIO 0 and the controller
2160 state is undefined. Record the mode */
2162 ata_link_for_each_dev(dev, &ap->link)
2163 dev->pio_mode = XFER_PIO_0;
2165 /* read IDENTIFY page and configure devices. We have to do the identify
2166 specific sequence bass-ackwards so that PDIAG- is released by
2169 ata_link_for_each_dev(dev, &ap->link) {
2170 if (tries[dev->devno])
2171 dev->class = classes[dev->devno];
2173 if (!ata_dev_enabled(dev))
2176 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2182 /* Now ask for the cable type as PDIAG- should have been released */
2183 if (ap->ops->cable_detect)
2184 ap->cbl = ap->ops->cable_detect(ap);
2186 /* We may have SATA bridge glue hiding here irrespective of the
2187 reported cable types and sensed types */
2188 ata_link_for_each_dev(dev, &ap->link) {
2189 if (!ata_dev_enabled(dev))
2191 /* SATA drives indicate we have a bridge. We don't know which
2192 end of the link the bridge is which is a problem */
2193 if (ata_id_is_sata(dev->id))
2194 ap->cbl = ATA_CBL_SATA;
2197 /* After the identify sequence we can now set up the devices. We do
2198 this in the normal order so that the user doesn't get confused */
2200 ata_link_for_each_dev(dev, &ap->link) {
2201 if (!ata_dev_enabled(dev))
2204 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2205 rc = ata_dev_configure(dev);
2206 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2211 /* configure transfer mode */
2212 rc = ata_set_mode(&ap->link, &dev);
2216 ata_link_for_each_dev(dev, &ap->link)
2217 if (ata_dev_enabled(dev))
2220 /* no device present, disable port */
2221 ata_port_disable(ap);
2225 tries[dev->devno]--;
2229 /* eeek, something went very wrong, give up */
2230 tries[dev->devno] = 0;
2234 /* give it just one more chance */
2235 tries[dev->devno] = min(tries[dev->devno], 1);
2237 if (tries[dev->devno] == 1) {
2238 /* This is the last chance, better to slow
2239 * down than lose it.
2241 sata_down_spd_limit(&ap->link);
2242 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2246 if (!tries[dev->devno])
2247 ata_dev_disable(dev);
2253 * ata_port_probe - Mark port as enabled
2254 * @ap: Port for which we indicate enablement
2256 * Modify @ap data structure such that the system
2257 * thinks that the entire port is enabled.
2259 * LOCKING: host lock, or some other form of
2263 void ata_port_probe(struct ata_port *ap)
2265 ap->flags &= ~ATA_FLAG_DISABLED;
2269 * sata_print_link_status - Print SATA link status
2270 * @link: SATA link to printk link status about
2272 * This function prints link speed and status of a SATA link.
2277 void sata_print_link_status(struct ata_link *link)
2279 u32 sstatus, scontrol, tmp;
2281 if (sata_scr_read(link, SCR_STATUS, &sstatus))
2283 sata_scr_read(link, SCR_CONTROL, &scontrol);
2285 if (ata_link_online(link)) {
2286 tmp = (sstatus >> 4) & 0xf;
2287 ata_link_printk(link, KERN_INFO,
2288 "SATA link up %s (SStatus %X SControl %X)\n",
2289 sata_spd_string(tmp), sstatus, scontrol);
2291 ata_link_printk(link, KERN_INFO,
2292 "SATA link down (SStatus %X SControl %X)\n",
2298 * __sata_phy_reset - Wake/reset a low-level SATA PHY
2299 * @ap: SATA port associated with target SATA PHY.
2301 * This function issues commands to standard SATA Sxxx
2302 * PHY registers, to wake up the phy (and device), and
2303 * clear any reset condition.
2306 * PCI/etc. bus probe sem.
2309 void __sata_phy_reset(struct ata_port *ap)
2311 struct ata_link *link = &ap->link;
2312 unsigned long timeout = jiffies + (HZ * 5);
2315 if (ap->flags & ATA_FLAG_SATA_RESET) {
2316 /* issue phy wake/reset */
2317 sata_scr_write_flush(link, SCR_CONTROL, 0x301);
2318 /* Couldn't find anything in SATA I/II specs, but
2319 * AHCI-1.1 10.4.2 says at least 1 ms. */
2322 /* phy wake/clear reset */
2323 sata_scr_write_flush(link, SCR_CONTROL, 0x300);
2325 /* wait for phy to become ready, if necessary */
2328 sata_scr_read(link, SCR_STATUS, &sstatus);
2329 if ((sstatus & 0xf) != 1)
2331 } while (time_before(jiffies, timeout));
2333 /* print link status */
2334 sata_print_link_status(link);
2336 /* TODO: phy layer with polling, timeouts, etc. */
2337 if (!ata_link_offline(link))
2340 ata_port_disable(ap);
2342 if (ap->flags & ATA_FLAG_DISABLED)
2345 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2346 ata_port_disable(ap);
2350 ap->cbl = ATA_CBL_SATA;
2354 * sata_phy_reset - Reset SATA bus.
2355 * @ap: SATA port associated with target SATA PHY.
2357 * This function resets the SATA bus, and then probes
2358 * the bus for devices.
2361 * PCI/etc. bus probe sem.
2364 void sata_phy_reset(struct ata_port *ap)
2366 __sata_phy_reset(ap);
2367 if (ap->flags & ATA_FLAG_DISABLED)
2373 * ata_dev_pair - return other device on cable
2376 * Obtain the other device on the same cable, or if none is
2377 * present NULL is returned
2380 struct ata_device *ata_dev_pair(struct ata_device *adev)
2382 struct ata_link *link = adev->link;
2383 struct ata_device *pair = &link->device[1 - adev->devno];
2384 if (!ata_dev_enabled(pair))
2390 * ata_port_disable - Disable port.
2391 * @ap: Port to be disabled.
2393 * Modify @ap data structure such that the system
2394 * thinks that the entire port is disabled, and should
2395 * never attempt to probe or communicate with devices
2398 * LOCKING: host lock, or some other form of
2402 void ata_port_disable(struct ata_port *ap)
2404 ap->link.device[0].class = ATA_DEV_NONE;
2405 ap->link.device[1].class = ATA_DEV_NONE;
2406 ap->flags |= ATA_FLAG_DISABLED;
2410 * sata_down_spd_limit - adjust SATA spd limit downward
2411 * @link: Link to adjust SATA spd limit for
2413 * Adjust SATA spd limit of @link downward. Note that this
2414 * function only adjusts the limit. The change must be applied
2415 * using sata_set_spd().
2418 * Inherited from caller.
2421 * 0 on success, negative errno on failure
2423 int sata_down_spd_limit(struct ata_link *link)
2425 u32 sstatus, spd, mask;
2428 if (!sata_scr_valid(link))
2431 /* If SCR can be read, use it to determine the current SPD.
2432 * If not, use cached value in link->sata_spd.
2434 rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2436 spd = (sstatus >> 4) & 0xf;
2438 spd = link->sata_spd;
2440 mask = link->sata_spd_limit;
2444 /* unconditionally mask off the highest bit */
2445 highbit = fls(mask) - 1;
2446 mask &= ~(1 << highbit);
2448 /* Mask off all speeds higher than or equal to the current
2449 * one. Force 1.5Gbps if current SPD is not available.
2452 mask &= (1 << (spd - 1)) - 1;
2456 /* were we already at the bottom? */
2460 link->sata_spd_limit = mask;
2462 ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2463 sata_spd_string(fls(mask)));
2468 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2472 if (link->sata_spd_limit == UINT_MAX)
2475 limit = fls(link->sata_spd_limit);
2477 spd = (*scontrol >> 4) & 0xf;
2478 *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
2480 return spd != limit;
2484 * sata_set_spd_needed - is SATA spd configuration needed
2485 * @link: Link in question
2487 * Test whether the spd limit in SControl matches
2488 * @link->sata_spd_limit. This function is used to determine
2489 * whether hardreset is necessary to apply SATA spd
2493 * Inherited from caller.
2496 * 1 if SATA spd configuration is needed, 0 otherwise.
2498 int sata_set_spd_needed(struct ata_link *link)
2502 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2505 return __sata_set_spd_needed(link, &scontrol);
2509 * sata_set_spd - set SATA spd according to spd limit
2510 * @link: Link to set SATA spd for
2512 * Set SATA spd of @link according to sata_spd_limit.
2515 * Inherited from caller.
2518 * 0 if spd doesn't need to be changed, 1 if spd has been
2519 * changed. Negative errno if SCR registers are inaccessible.
2521 int sata_set_spd(struct ata_link *link)
2526 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2529 if (!__sata_set_spd_needed(link, &scontrol))
2532 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2539 * This mode timing computation functionality is ported over from
2540 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
2543 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
2544 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2545 * for UDMA6, which is currently supported only by Maxtor drives.
2547 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
2550 static const struct ata_timing ata_timing[] = {
2552 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
2553 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
2554 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
2555 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
2557 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 },
2558 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 },
2559 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
2560 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
2561 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
2563 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
2565 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
2566 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
2567 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
2569 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
2570 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
2571 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
2573 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 },
2574 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 },
2575 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
2576 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
2578 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
2579 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
2580 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
2582 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
2587 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
2588 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
2590 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
2592 q->setup = EZ(t->setup * 1000, T);
2593 q->act8b = EZ(t->act8b * 1000, T);
2594 q->rec8b = EZ(t->rec8b * 1000, T);
2595 q->cyc8b = EZ(t->cyc8b * 1000, T);
2596 q->active = EZ(t->active * 1000, T);
2597 q->recover = EZ(t->recover * 1000, T);
2598 q->cycle = EZ(t->cycle * 1000, T);
2599 q->udma = EZ(t->udma * 1000, UT);
2602 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
2603 struct ata_timing *m, unsigned int what)
2605 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
2606 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
2607 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
2608 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
2609 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
2610 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
2611 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
2612 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
2615 static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
2617 const struct ata_timing *t;
2619 for (t = ata_timing; t->mode != speed; t++)
2620 if (t->mode == 0xFF)
2625 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
2626 struct ata_timing *t, int T, int UT)
2628 const struct ata_timing *s;
2629 struct ata_timing p;
2635 if (!(s = ata_timing_find_mode(speed)))
2638 memcpy(t, s, sizeof(*s));
2641 * If the drive is an EIDE drive, it can tell us it needs extended
2642 * PIO/MW_DMA cycle timing.
2645 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
2646 memset(&p, 0, sizeof(p));
2647 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
2648 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
2649 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
2650 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
2651 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
2653 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
2657 * Convert the timing to bus clock counts.
2660 ata_timing_quantize(t, t, T, UT);
2663 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2664 * S.M.A.R.T * and some other commands. We have to ensure that the
2665 * DMA cycle timing is slower/equal than the fastest PIO timing.
2668 if (speed > XFER_PIO_6) {
2669 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
2670 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
2674 * Lengthen active & recovery time so that cycle time is correct.
2677 if (t->act8b + t->rec8b < t->cyc8b) {
2678 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
2679 t->rec8b = t->cyc8b - t->act8b;
2682 if (t->active + t->recover < t->cycle) {
2683 t->active += (t->cycle - (t->active + t->recover)) / 2;
2684 t->recover = t->cycle - t->active;
2687 /* In a few cases quantisation may produce enough errors to
2688 leave t->cycle too low for the sum of active and recovery
2689 if so we must correct this */
2690 if (t->active + t->recover > t->cycle)
2691 t->cycle = t->active + t->recover;
2697 * ata_down_xfermask_limit - adjust dev xfer masks downward
2698 * @dev: Device to adjust xfer masks
2699 * @sel: ATA_DNXFER_* selector
2701 * Adjust xfer masks of @dev downward. Note that this function
2702 * does not apply the change. Invoking ata_set_mode() afterwards
2703 * will apply the limit.
2706 * Inherited from caller.
2709 * 0 on success, negative errno on failure
2711 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2714 unsigned int orig_mask, xfer_mask;
2715 unsigned int pio_mask, mwdma_mask, udma_mask;
2718 quiet = !!(sel & ATA_DNXFER_QUIET);
2719 sel &= ~ATA_DNXFER_QUIET;
2721 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
2724 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
2727 case ATA_DNXFER_PIO:
2728 highbit = fls(pio_mask) - 1;
2729 pio_mask &= ~(1 << highbit);
2732 case ATA_DNXFER_DMA:
2734 highbit = fls(udma_mask) - 1;
2735 udma_mask &= ~(1 << highbit);
2738 } else if (mwdma_mask) {
2739 highbit = fls(mwdma_mask) - 1;
2740 mwdma_mask &= ~(1 << highbit);
2746 case ATA_DNXFER_40C:
2747 udma_mask &= ATA_UDMA_MASK_40C;
2750 case ATA_DNXFER_FORCE_PIO0:
2752 case ATA_DNXFER_FORCE_PIO:
2761 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
2763 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
2767 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
2768 snprintf(buf, sizeof(buf), "%s:%s",
2769 ata_mode_string(xfer_mask),
2770 ata_mode_string(xfer_mask & ATA_MASK_PIO));
2772 snprintf(buf, sizeof(buf), "%s",
2773 ata_mode_string(xfer_mask));
2775 ata_dev_printk(dev, KERN_WARNING,
2776 "limiting speed to %s\n", buf);
2779 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
2785 static int ata_dev_set_mode(struct ata_device *dev)
2787 struct ata_eh_context *ehc = &dev->link->eh_context;
2788 unsigned int err_mask;
2791 dev->flags &= ~ATA_DFLAG_PIO;
2792 if (dev->xfer_shift == ATA_SHIFT_PIO)
2793 dev->flags |= ATA_DFLAG_PIO;
2795 err_mask = ata_dev_set_xfermode(dev);
2796 /* Old CFA may refuse this command, which is just fine */
2797 if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
2798 err_mask &= ~AC_ERR_DEV;
2799 /* Some very old devices and some bad newer ones fail any kind of
2800 SET_XFERMODE request but support PIO0-2 timings and no IORDY */
2801 if (dev->xfer_shift == ATA_SHIFT_PIO && !ata_id_has_iordy(dev->id) &&
2802 dev->pio_mode <= XFER_PIO_2)
2803 err_mask &= ~AC_ERR_DEV;
2805 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
2806 "(err_mask=0x%x)\n", err_mask);
2810 ehc->i.flags |= ATA_EHI_POST_SETMODE;
2811 rc = ata_dev_revalidate(dev, 0);
2812 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2816 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2817 dev->xfer_shift, (int)dev->xfer_mode);
2819 ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
2820 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2825 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER
2826 * @link: link on which timings will be programmed
2827 * @r_failed_dev: out paramter for failed device
2829 * Standard implementation of the function used to tune and set
2830 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2831 * ata_dev_set_mode() fails, pointer to the failing device is
2832 * returned in @r_failed_dev.
2835 * PCI/etc. bus probe sem.
2838 * 0 on success, negative errno otherwise
2841 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
2843 struct ata_port *ap = link->ap;
2844 struct ata_device *dev;
2845 int rc = 0, used_dma = 0, found = 0;
2847 /* step 1: calculate xfer_mask */
2848 ata_link_for_each_dev(dev, link) {
2849 unsigned int pio_mask, dma_mask;
2851 if (!ata_dev_enabled(dev))
2854 ata_dev_xfermask(dev);
2856 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
2857 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2858 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
2859 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2868 /* step 2: always set host PIO timings */
2869 ata_link_for_each_dev(dev, link) {
2870 if (!ata_dev_enabled(dev))
2873 if (!dev->pio_mode) {
2874 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2879 dev->xfer_mode = dev->pio_mode;
2880 dev->xfer_shift = ATA_SHIFT_PIO;
2881 if (ap->ops->set_piomode)
2882 ap->ops->set_piomode(ap, dev);
2885 /* step 3: set host DMA timings */
2886 ata_link_for_each_dev(dev, link) {
2887 if (!ata_dev_enabled(dev) || !dev->dma_mode)
2890 dev->xfer_mode = dev->dma_mode;
2891 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
2892 if (ap->ops->set_dmamode)
2893 ap->ops->set_dmamode(ap, dev);
2896 /* step 4: update devices' xfer mode */
2897 ata_link_for_each_dev(dev, link) {
2898 /* don't update suspended devices' xfer mode */
2899 if (!ata_dev_enabled(dev))
2902 rc = ata_dev_set_mode(dev);
2907 /* Record simplex status. If we selected DMA then the other
2908 * host channels are not permitted to do so.
2910 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
2911 ap->host->simplex_claimed = ap;
2915 *r_failed_dev = dev;
2920 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2921 * @link: link on which timings will be programmed
2922 * @r_failed_dev: out paramter for failed device
2924 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2925 * ata_set_mode() fails, pointer to the failing device is
2926 * returned in @r_failed_dev.
2929 * PCI/etc. bus probe sem.
2932 * 0 on success, negative errno otherwise
2934 int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
2936 struct ata_port *ap = link->ap;
2938 /* has private set_mode? */
2939 if (ap->ops->set_mode)
2940 return ap->ops->set_mode(link, r_failed_dev);
2941 return ata_do_set_mode(link, r_failed_dev);
2945 * ata_tf_to_host - issue ATA taskfile to host controller
2946 * @ap: port to which command is being issued
2947 * @tf: ATA taskfile register set
2949 * Issues ATA taskfile register set to ATA host controller,
2950 * with proper synchronization with interrupt handler and
2954 * spin_lock_irqsave(host lock)
2957 static inline void ata_tf_to_host(struct ata_port *ap,
2958 const struct ata_taskfile *tf)
2960 ap->ops->tf_load(ap, tf);
2961 ap->ops->exec_command(ap, tf);
2965 * ata_busy_sleep - sleep until BSY clears, or timeout
2966 * @ap: port containing status register to be polled
2967 * @tmout_pat: impatience timeout
2968 * @tmout: overall timeout
2970 * Sleep until ATA Status register bit BSY clears,
2971 * or a timeout occurs.
2974 * Kernel thread context (may sleep).
2977 * 0 on success, -errno otherwise.
2979 int ata_busy_sleep(struct ata_port *ap,
2980 unsigned long tmout_pat, unsigned long tmout)
2982 unsigned long timer_start, timeout;
2985 status = ata_busy_wait(ap, ATA_BUSY, 300);
2986 timer_start = jiffies;
2987 timeout = timer_start + tmout_pat;
2988 while (status != 0xff && (status & ATA_BUSY) &&
2989 time_before(jiffies, timeout)) {
2991 status = ata_busy_wait(ap, ATA_BUSY, 3);
2994 if (status != 0xff && (status & ATA_BUSY))
2995 ata_port_printk(ap, KERN_WARNING,
2996 "port is slow to respond, please be patient "
2997 "(Status 0x%x)\n", status);
2999 timeout = timer_start + tmout;
3000 while (status != 0xff && (status & ATA_BUSY) &&
3001 time_before(jiffies, timeout)) {
3003 status = ata_chk_status(ap);
3009 if (status & ATA_BUSY) {
3010 ata_port_printk(ap, KERN_ERR, "port failed to respond "
3011 "(%lu secs, Status 0x%x)\n",
3012 tmout / HZ, status);
3020 * ata_wait_ready - sleep until BSY clears, or timeout
3021 * @ap: port containing status register to be polled
3022 * @deadline: deadline jiffies for the operation
3024 * Sleep until ATA Status register bit BSY clears, or timeout
3028 * Kernel thread context (may sleep).
3031 * 0 on success, -errno otherwise.
3033 int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
3035 unsigned long start = jiffies;
3039 u8 status = ata_chk_status(ap);
3040 unsigned long now = jiffies;
3042 if (!(status & ATA_BUSY))
3044 if (!ata_link_online(&ap->link) && status == 0xff)
3046 if (time_after(now, deadline))
3049 if (!warned && time_after(now, start + 5 * HZ) &&
3050 (deadline - now > 3 * HZ)) {
3051 ata_port_printk(ap, KERN_WARNING,
3052 "port is slow to respond, please be patient "
3053 "(Status 0x%x)\n", status);
3061 static int ata_bus_post_reset(struct ata_port *ap, unsigned int devmask,
3062 unsigned long deadline)
3064 struct ata_ioports *ioaddr = &ap->ioaddr;
3065 unsigned int dev0 = devmask & (1 << 0);
3066 unsigned int dev1 = devmask & (1 << 1);
3069 /* if device 0 was found in ata_devchk, wait for its
3073 rc = ata_wait_ready(ap, deadline);
3081 /* if device 1 was found in ata_devchk, wait for register
3082 * access briefly, then wait for BSY to clear.
3087 ap->ops->dev_select(ap, 1);
3089 /* Wait for register access. Some ATAPI devices fail
3090 * to set nsect/lbal after reset, so don't waste too
3091 * much time on it. We're gonna wait for !BSY anyway.
3093 for (i = 0; i < 2; i++) {
3096 nsect = ioread8(ioaddr->nsect_addr);
3097 lbal = ioread8(ioaddr->lbal_addr);
3098 if ((nsect == 1) && (lbal == 1))
3100 msleep(50); /* give drive a breather */
3103 rc = ata_wait_ready(ap, deadline);
3111 /* is all this really necessary? */
3112 ap->ops->dev_select(ap, 0);
3114 ap->ops->dev_select(ap, 1);
3116 ap->ops->dev_select(ap, 0);
3121 static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
3122 unsigned long deadline)
3124 struct ata_ioports *ioaddr = &ap->ioaddr;
3126 DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
3128 /* software reset. causes dev0 to be selected */
3129 iowrite8(ap->ctl, ioaddr->ctl_addr);
3130 udelay(20); /* FIXME: flush */
3131 iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
3132 udelay(20); /* FIXME: flush */
3133 iowrite8(ap->ctl, ioaddr->ctl_addr);
3135 /* spec mandates ">= 2ms" before checking status.
3136 * We wait 150ms, because that was the magic delay used for
3137 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
3138 * between when the ATA command register is written, and then
3139 * status is checked. Because waiting for "a while" before
3140 * checking status is fine, post SRST, we perform this magic
3141 * delay here as well.
3143 * Old drivers/ide uses the 2mS rule and then waits for ready
3147 /* Before we perform post reset processing we want to see if
3148 * the bus shows 0xFF because the odd clown forgets the D7
3149 * pulldown resistor.
3151 if (ata_check_status(ap) == 0xFF)
3154 return ata_bus_post_reset(ap, devmask, deadline);
3158 * ata_bus_reset - reset host port and associated ATA channel
3159 * @ap: port to reset
3161 * This is typically the first time we actually start issuing
3162 * commands to the ATA channel. We wait for BSY to clear, then
3163 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
3164 * result. Determine what devices, if any, are on the channel
3165 * by looking at the device 0/1 error register. Look at the signature
3166 * stored in each device's taskfile registers, to determine if
3167 * the device is ATA or ATAPI.
3170 * PCI/etc. bus probe sem.
3171 * Obtains host lock.
3174 * Sets ATA_FLAG_DISABLED if bus reset fails.
3177 void ata_bus_reset(struct ata_port *ap)
3179 struct ata_device *device = ap->link.device;
3180 struct ata_ioports *ioaddr = &ap->ioaddr;
3181 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3183 unsigned int dev0, dev1 = 0, devmask = 0;
3186 DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
3188 /* determine if device 0/1 are present */
3189 if (ap->flags & ATA_FLAG_SATA_RESET)
3192 dev0 = ata_devchk(ap, 0);
3194 dev1 = ata_devchk(ap, 1);
3198 devmask |= (1 << 0);
3200 devmask |= (1 << 1);
3202 /* select device 0 again */
3203 ap->ops->dev_select(ap, 0);
3205 /* issue bus reset */
3206 if (ap->flags & ATA_FLAG_SRST) {
3207 rc = ata_bus_softreset(ap, devmask, jiffies + 40 * HZ);
3208 if (rc && rc != -ENODEV)
3213 * determine by signature whether we have ATA or ATAPI devices
3215 device[0].class = ata_dev_try_classify(ap, 0, &err);
3216 if ((slave_possible) && (err != 0x81))
3217 device[1].class = ata_dev_try_classify(ap, 1, &err);
3219 /* is double-select really necessary? */
3220 if (device[1].class != ATA_DEV_NONE)
3221 ap->ops->dev_select(ap, 1);
3222 if (device[0].class != ATA_DEV_NONE)
3223 ap->ops->dev_select(ap, 0);
3225 /* if no devices were detected, disable this port */
3226 if ((device[0].class == ATA_DEV_NONE) &&
3227 (device[1].class == ATA_DEV_NONE))
3230 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
3231 /* set up device control for ATA_FLAG_SATA_RESET */
3232 iowrite8(ap->ctl, ioaddr->ctl_addr);
3239 ata_port_printk(ap, KERN_ERR, "disabling port\n");
3240 ata_port_disable(ap);
3246 * sata_link_debounce - debounce SATA phy status
3247 * @link: ATA link to debounce SATA phy status for
3248 * @params: timing parameters { interval, duratinon, timeout } in msec
3249 * @deadline: deadline jiffies for the operation
3251 * Make sure SStatus of @link reaches stable state, determined by
3252 * holding the same value where DET is not 1 for @duration polled
3253 * every @interval, before @timeout. Timeout constraints the
3254 * beginning of the stable state. Because DET gets stuck at 1 on
3255 * some controllers after hot unplugging, this functions waits
3256 * until timeout then returns 0 if DET is stable at 1.
3258 * @timeout is further limited by @deadline. The sooner of the
3262 * Kernel thread context (may sleep)
3265 * 0 on success, -errno on failure.
3267 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3268 unsigned long deadline)
3270 unsigned long interval_msec = params[0];
3271 unsigned long duration = msecs_to_jiffies(params[1]);
3272 unsigned long last_jiffies, t;
3276 t = jiffies + msecs_to_jiffies(params[2]);
3277 if (time_before(t, deadline))
3280 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3285 last_jiffies = jiffies;
3288 msleep(interval_msec);
3289 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3295 if (cur == 1 && time_before(jiffies, deadline))
3297 if (time_after(jiffies, last_jiffies + duration))
3302 /* unstable, start over */
3304 last_jiffies = jiffies;
3306 /* Check deadline. If debouncing failed, return
3307 * -EPIPE to tell upper layer to lower link speed.
3309 if (time_after(jiffies, deadline))
3315 * sata_link_resume - resume SATA link
3316 * @link: ATA link to resume SATA
3317 * @params: timing parameters { interval, duratinon, timeout } in msec
3318 * @deadline: deadline jiffies for the operation
3320 * Resume SATA phy @link and debounce it.
3323 * Kernel thread context (may sleep)
3326 * 0 on success, -errno on failure.
3328 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3329 unsigned long deadline)
3334 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3337 scontrol = (scontrol & 0x0f0) | 0x300;
3339 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3342 /* Some PHYs react badly if SStatus is pounded immediately
3343 * after resuming. Delay 200ms before debouncing.
3347 return sata_link_debounce(link, params, deadline);
3351 * ata_std_prereset - prepare for reset
3352 * @link: ATA link to be reset
3353 * @deadline: deadline jiffies for the operation
3355 * @link is about to be reset. Initialize it. Failure from
3356 * prereset makes libata abort whole reset sequence and give up
3357 * that port, so prereset should be best-effort. It does its
3358 * best to prepare for reset sequence but if things go wrong, it
3359 * should just whine, not fail.
3362 * Kernel thread context (may sleep)
3365 * 0 on success, -errno otherwise.
3367 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3369 struct ata_port *ap = link->ap;
3370 struct ata_eh_context *ehc = &link->eh_context;
3371 const unsigned long *timing = sata_ehc_deb_timing(ehc);
3374 /* handle link resume */
3375 if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
3376 (link->flags & ATA_LFLAG_HRST_TO_RESUME))
3377 ehc->i.action |= ATA_EH_HARDRESET;
3379 /* if we're about to do hardreset, nothing more to do */
3380 if (ehc->i.action & ATA_EH_HARDRESET)
3383 /* if SATA, resume link */
3384 if (ap->flags & ATA_FLAG_SATA) {
3385 rc = sata_link_resume(link, timing, deadline);
3386 /* whine about phy resume failure but proceed */
3387 if (rc && rc != -EOPNOTSUPP)
3388 ata_link_printk(link, KERN_WARNING, "failed to resume "
3389 "link for reset (errno=%d)\n", rc);
3392 /* Wait for !BSY if the controller can wait for the first D2H
3393 * Reg FIS and we don't know that no device is attached.
3395 if (!(link->flags & ATA_LFLAG_SKIP_D2H_BSY) && !ata_link_offline(link)) {
3396 rc = ata_wait_ready(ap, deadline);
3397 if (rc && rc != -ENODEV) {
3398 ata_link_printk(link, KERN_WARNING, "device not ready "
3399 "(errno=%d), forcing hardreset\n", rc);
3400 ehc->i.action |= ATA_EH_HARDRESET;
3408 * ata_std_softreset - reset host port via ATA SRST
3409 * @link: ATA link to reset
3410 * @classes: resulting classes of attached devices
3411 * @deadline: deadline jiffies for the operation
3413 * Reset host port using ATA SRST.
3416 * Kernel thread context (may sleep)
3419 * 0 on success, -errno otherwise.
3421 int ata_std_softreset(struct ata_link *link, unsigned int *classes,
3422 unsigned long deadline)
3424 struct ata_port *ap = link->ap;
3425 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3426 unsigned int devmask = 0;
3432 if (ata_link_offline(link)) {
3433 classes[0] = ATA_DEV_NONE;
3437 /* determine if device 0/1 are present */
3438 if (ata_devchk(ap, 0))
3439 devmask |= (1 << 0);
3440 if (slave_possible && ata_devchk(ap, 1))
3441 devmask |= (1 << 1);
3443 /* select device 0 again */
3444 ap->ops->dev_select(ap, 0);
3446 /* issue bus reset */
3447 DPRINTK("about to softreset, devmask=%x\n", devmask);
3448 rc = ata_bus_softreset(ap, devmask, deadline);
3449 /* if link is occupied, -ENODEV too is an error */
3450 if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
3451 ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
3455 /* determine by signature whether we have ATA or ATAPI devices */
3456 classes[0] = ata_dev_try_classify(ap, 0, &err);
3457 if (slave_possible && err != 0x81)
3458 classes[1] = ata_dev_try_classify(ap, 1, &err);
3461 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
3466 * sata_link_hardreset - reset link via SATA phy reset
3467 * @link: link to reset
3468 * @timing: timing parameters { interval, duratinon, timeout } in msec
3469 * @deadline: deadline jiffies for the operation
3471 * SATA phy-reset @link using DET bits of SControl register.
3474 * Kernel thread context (may sleep)
3477 * 0 on success, -errno otherwise.
3479 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3480 unsigned long deadline)
3487 if (sata_set_spd_needed(link)) {
3488 /* SATA spec says nothing about how to reconfigure
3489 * spd. To be on the safe side, turn off phy during
3490 * reconfiguration. This works for at least ICH7 AHCI
3493 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3496 scontrol = (scontrol & 0x0f0) | 0x304;
3498 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3504 /* issue phy wake/reset */
3505 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3508 scontrol = (scontrol & 0x0f0) | 0x301;
3510 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3513 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3514 * 10.4.2 says at least 1 ms.
3518 /* bring link back */
3519 rc = sata_link_resume(link, timing, deadline);
3521 DPRINTK("EXIT, rc=%d\n", rc);
3526 * sata_std_hardreset - reset host port via SATA phy reset
3527 * @link: link to reset
3528 * @class: resulting class of attached device
3529 * @deadline: deadline jiffies for the operation
3531 * SATA phy-reset host port using DET bits of SControl register,
3532 * wait for !BSY and classify the attached device.
3535 * Kernel thread context (may sleep)
3538 * 0 on success, -errno otherwise.
3540 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3541 unsigned long deadline)
3543 struct ata_port *ap = link->ap;
3544 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3550 rc = sata_link_hardreset(link, timing, deadline);
3552 ata_link_printk(link, KERN_ERR,
3553 "COMRESET failed (errno=%d)\n", rc);
3557 /* TODO: phy layer with polling, timeouts, etc. */
3558 if (ata_link_offline(link)) {
3559 *class = ATA_DEV_NONE;
3560 DPRINTK("EXIT, link offline\n");
3564 /* wait a while before checking status, see SRST for more info */
3567 rc = ata_wait_ready(ap, deadline);
3568 /* link occupied, -ENODEV too is an error */
3570 ata_link_printk(link, KERN_ERR,
3571 "COMRESET failed (errno=%d)\n", rc);
3575 ap->ops->dev_select(ap, 0); /* probably unnecessary */
3577 *class = ata_dev_try_classify(ap, 0, NULL);
3579 DPRINTK("EXIT, class=%u\n", *class);
3584 * ata_std_postreset - standard postreset callback
3585 * @link: the target ata_link
3586 * @classes: classes of attached devices
3588 * This function is invoked after a successful reset. Note that
3589 * the device might have been reset more than once using
3590 * different reset methods before postreset is invoked.
3593 * Kernel thread context (may sleep)
3595 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3597 struct ata_port *ap = link->ap;
3602 /* print link status */
3603 sata_print_link_status(link);
3606 if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
3607 sata_scr_write(link, SCR_ERROR, serror);
3609 /* is double-select really necessary? */
3610 if (classes[0] != ATA_DEV_NONE)
3611 ap->ops->dev_select(ap, 1);
3612 if (classes[1] != ATA_DEV_NONE)
3613 ap->ops->dev_select(ap, 0);
3615 /* bail out if no device is present */
3616 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
3617 DPRINTK("EXIT, no device\n");
3621 /* set up device control */
3622 if (ap->ioaddr.ctl_addr)
3623 iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3629 * ata_dev_same_device - Determine whether new ID matches configured device
3630 * @dev: device to compare against
3631 * @new_class: class of the new device
3632 * @new_id: IDENTIFY page of the new device
3634 * Compare @new_class and @new_id against @dev and determine
3635 * whether @dev is the device indicated by @new_class and
3642 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
3644 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
3647 const u16 *old_id = dev->id;
3648 unsigned char model[2][ATA_ID_PROD_LEN + 1];
3649 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3651 if (dev->class != new_class) {
3652 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
3653 dev->class, new_class);
3657 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
3658 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
3659 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
3660 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3662 if (strcmp(model[0], model[1])) {
3663 ata_dev_printk(dev, KERN_INFO, "model number mismatch "
3664 "'%s' != '%s'\n", model[0], model[1]);
3668 if (strcmp(serial[0], serial[1])) {
3669 ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
3670 "'%s' != '%s'\n", serial[0], serial[1]);
3678 * ata_dev_reread_id - Re-read IDENTIFY data
3679 * @dev: target ATA device
3680 * @readid_flags: read ID flags
3682 * Re-read IDENTIFY page and make sure @dev is still attached to
3686 * Kernel thread context (may sleep)
3689 * 0 on success, negative errno otherwise
3691 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3693 unsigned int class = dev->class;
3694 u16 *id = (void *)dev->link->ap->sector_buf;
3698 rc = ata_dev_read_id(dev, &class, readid_flags, id);
3702 /* is the device still there? */
3703 if (!ata_dev_same_device(dev, class, id))
3706 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3711 * ata_dev_revalidate - Revalidate ATA device
3712 * @dev: device to revalidate
3713 * @readid_flags: read ID flags
3715 * Re-read IDENTIFY page, make sure @dev is still attached to the
3716 * port and reconfigure it according to the new IDENTIFY page.
3719 * Kernel thread context (may sleep)
3722 * 0 on success, negative errno otherwise
3724 int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
3726 u64 n_sectors = dev->n_sectors;
3729 if (!ata_dev_enabled(dev))
3733 rc = ata_dev_reread_id(dev, readid_flags);
3737 /* configure device according to the new ID */
3738 rc = ata_dev_configure(dev);
3742 /* verify n_sectors hasn't changed */
3743 if (dev->class == ATA_DEV_ATA && n_sectors &&
3744 dev->n_sectors != n_sectors) {
3745 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
3747 (unsigned long long)n_sectors,
3748 (unsigned long long)dev->n_sectors);
3750 /* restore original n_sectors */
3751 dev->n_sectors = n_sectors;
3760 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3764 struct ata_blacklist_entry {
3765 const char *model_num;
3766 const char *model_rev;
3767 unsigned long horkage;
3770 static const struct ata_blacklist_entry ata_device_blacklist [] = {
3771 /* Devices with DMA related problems under Linux */
3772 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
3773 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
3774 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
3775 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
3776 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
3777 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
3778 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
3779 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
3780 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
3781 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA },
3782 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA },
3783 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
3784 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
3785 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
3786 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
3787 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
3788 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA },
3789 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA },
3790 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
3791 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
3792 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
3793 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
3794 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
3795 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
3796 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
3797 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
3798 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
3799 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
3800 { "SAMSUNG CD-ROM SN-124","N001", ATA_HORKAGE_NODMA },
3801 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA },
3802 { "IOMEGA ZIP 250 ATAPI", NULL, ATA_HORKAGE_NODMA }, /* temporary fix */
3803 { "IOMEGA ZIP 250 ATAPI Floppy",
3804 NULL, ATA_HORKAGE_NODMA },
3806 /* Weird ATAPI devices */
3807 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
3809 /* Devices we expect to fail diagnostics */
3811 /* Devices where NCQ should be avoided */
3813 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
3814 /* http://thread.gmane.org/gmane.linux.ide/14907 */
3815 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ },
3817 { "Maxtor *", "BANC*", ATA_HORKAGE_NONCQ },
3818 { "Maxtor 7V300F0", "VA111630", ATA_HORKAGE_NONCQ },
3819 { "HITACHI HDS7250SASUN500G 0621KTAWSD", "K2AOAJ0AHITACHI",
3820 ATA_HORKAGE_NONCQ },
3822 /* Blacklist entries taken from Silicon Image 3124/3132
3823 Windows driver .inf file - also several Linux problem reports */
3824 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, },
3825 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, },
3826 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, },
3827 /* Drives which do spurious command completion */
3828 { "HTS541680J9SA00", "SB2IC7EP", ATA_HORKAGE_NONCQ, },
3829 { "HTS541612J9SA00", "SBDIC7JP", ATA_HORKAGE_NONCQ, },
3830 { "Hitachi HTS541616J9SA00", "SB4OC70P", ATA_HORKAGE_NONCQ, },
3831 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, },
3832 { "FUJITSU MHV2080BH", "00840028", ATA_HORKAGE_NONCQ, },
3833 { "ST9160821AS", "3.CLF", ATA_HORKAGE_NONCQ, },
3834 { "ST3160812AS", "3.AD", ATA_HORKAGE_NONCQ, },
3835 { "SAMSUNG HD401LJ", "ZZ100-15", ATA_HORKAGE_NONCQ, },
3837 /* devices which puke on READ_NATIVE_MAX */
3838 { "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, },
3839 { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
3840 { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
3841 { "MAXTOR 6L080L4", "A93.0500", ATA_HORKAGE_BROKEN_HPA },
3847 int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
3853 * check for trailing wildcard: *\0
3855 p = strchr(patt, wildchar);
3856 if (p && ((*(p + 1)) == 0))
3861 return strncmp(patt, name, len);
3864 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
3866 unsigned char model_num[ATA_ID_PROD_LEN + 1];
3867 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3868 const struct ata_blacklist_entry *ad = ata_device_blacklist;
3870 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
3871 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
3873 while (ad->model_num) {
3874 if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
3875 if (ad->model_rev == NULL)
3877 if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
3885 static int ata_dma_blacklisted(const struct ata_device *dev)
3887 /* We don't support polling DMA.
3888 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
3889 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
3891 if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
3892 (dev->flags & ATA_DFLAG_CDB_INTR))
3894 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
3898 * ata_dev_xfermask - Compute supported xfermask of the given device
3899 * @dev: Device to compute xfermask for
3901 * Compute supported xfermask of @dev and store it in
3902 * dev->*_mask. This function is responsible for applying all
3903 * known limits including host controller limits, device
3909 static void ata_dev_xfermask(struct ata_device *dev)
3911 struct ata_link *link = dev->link;
3912 struct ata_port *ap = link->ap;
3913 struct ata_host *host = ap->host;
3914 unsigned long xfer_mask;
3916 /* controller modes available */
3917 xfer_mask = ata_pack_xfermask(ap->pio_mask,
3918 ap->mwdma_mask, ap->udma_mask);
3920 /* drive modes available */
3921 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
3922 dev->mwdma_mask, dev->udma_mask);
3923 xfer_mask &= ata_id_xfermask(dev->id);
3926 * CFA Advanced TrueIDE timings are not allowed on a shared
3929 if (ata_dev_pair(dev)) {
3930 /* No PIO5 or PIO6 */
3931 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
3932 /* No MWDMA3 or MWDMA 4 */
3933 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
3936 if (ata_dma_blacklisted(dev)) {
3937 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3938 ata_dev_printk(dev, KERN_WARNING,
3939 "device is on DMA blacklist, disabling DMA\n");
3942 if ((host->flags & ATA_HOST_SIMPLEX) &&
3943 host->simplex_claimed && host->simplex_claimed != ap) {
3944 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3945 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
3946 "other device, disabling DMA\n");
3949 if (ap->flags & ATA_FLAG_NO_IORDY)
3950 xfer_mask &= ata_pio_mask_no_iordy(dev);
3952 if (ap->ops->mode_filter)
3953 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
3955 /* Apply cable rule here. Don't apply it early because when
3956 * we handle hot plug the cable type can itself change.
3957 * Check this last so that we know if the transfer rate was
3958 * solely limited by the cable.
3959 * Unknown or 80 wire cables reported host side are checked
3960 * drive side as well. Cases where we know a 40wire cable
3961 * is used safely for 80 are not checked here.
3963 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
3964 /* UDMA/44 or higher would be available */
3965 if((ap->cbl == ATA_CBL_PATA40) ||
3966 (ata_drive_40wire(dev->id) &&
3967 (ap->cbl == ATA_CBL_PATA_UNK ||
3968 ap->cbl == ATA_CBL_PATA80))) {
3969 ata_dev_printk(dev, KERN_WARNING,
3970 "limited to UDMA/33 due to 40-wire cable\n");
3971 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
3974 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
3975 &dev->mwdma_mask, &dev->udma_mask);
3979 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3980 * @dev: Device to which command will be sent
3982 * Issue SET FEATURES - XFER MODE command to device @dev
3986 * PCI/etc. bus probe sem.
3989 * 0 on success, AC_ERR_* mask otherwise.
3992 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
3994 struct ata_taskfile tf;
3995 unsigned int err_mask;
3997 /* set up set-features taskfile */
3998 DPRINTK("set features - xfer mode\n");
4000 /* Some controllers and ATAPI devices show flaky interrupt
4001 * behavior after setting xfer mode. Use polling instead.
4003 ata_tf_init(dev, &tf);
4004 tf.command = ATA_CMD_SET_FEATURES;
4005 tf.feature = SETFEATURES_XFER;
4006 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4007 tf.protocol = ATA_PROT_NODATA;
4008 tf.nsect = dev->xfer_mode;
4010 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
4012 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4017 * ata_dev_set_AN - Issue SET FEATURES - SATA FEATURES
4018 * @dev: Device to which command will be sent
4019 * @enable: Whether to enable or disable the feature
4021 * Issue SET FEATURES - SATA FEATURES command to device @dev
4022 * on port @ap with sector count set to indicate Asynchronous
4023 * Notification feature
4026 * PCI/etc. bus probe sem.
4029 * 0 on success, AC_ERR_* mask otherwise.
4031 static unsigned int ata_dev_set_AN(struct ata_device *dev, u8 enable)
4033 struct ata_taskfile tf;
4034 unsigned int err_mask;
4036 /* set up set-features taskfile */
4037 DPRINTK("set features - SATA features\n");
4039 ata_tf_init(dev, &tf);
4040 tf.command = ATA_CMD_SET_FEATURES;
4041 tf.feature = enable;
4042 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4043 tf.protocol = ATA_PROT_NODATA;
4046 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
4048 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4053 * ata_dev_init_params - Issue INIT DEV PARAMS command
4054 * @dev: Device to which command will be sent
4055 * @heads: Number of heads (taskfile parameter)
4056 * @sectors: Number of sectors (taskfile parameter)
4059 * Kernel thread context (may sleep)
4062 * 0 on success, AC_ERR_* mask otherwise.
4064 static unsigned int ata_dev_init_params(struct ata_device *dev,
4065 u16 heads, u16 sectors)
4067 struct ata_taskfile tf;
4068 unsigned int err_mask;
4070 /* Number of sectors per track 1-255. Number of heads 1-16 */
4071 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4072 return AC_ERR_INVALID;
4074 /* set up init dev params taskfile */
4075 DPRINTK("init dev params \n");
4077 ata_tf_init(dev, &tf);
4078 tf.command = ATA_CMD_INIT_DEV_PARAMS;
4079 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4080 tf.protocol = ATA_PROT_NODATA;
4082 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4084 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
4085 /* A clean abort indicates an original or just out of spec drive
4086 and we should continue as we issue the setup based on the
4087 drive reported working geometry */
4088 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4091 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4096 * ata_sg_clean - Unmap DMA memory associated with command
4097 * @qc: Command containing DMA memory to be released
4099 * Unmap all mapped DMA memory associated with this command.
4102 * spin_lock_irqsave(host lock)
4104 void ata_sg_clean(struct ata_queued_cmd *qc)
4106 struct ata_port *ap = qc->ap;
4107 struct scatterlist *sg = qc->__sg;
4108 int dir = qc->dma_dir;
4109 void *pad_buf = NULL;
4111 WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
4112 WARN_ON(sg == NULL);
4114 if (qc->flags & ATA_QCFLAG_SINGLE)
4115 WARN_ON(qc->n_elem > 1);
4117 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
4119 /* if we padded the buffer out to 32-bit bound, and data
4120 * xfer direction is from-device, we must copy from the
4121 * pad buffer back into the supplied buffer
4123 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
4124 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4126 if (qc->flags & ATA_QCFLAG_SG) {
4128 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4129 /* restore last sg */
4130 sg[qc->orig_n_elem - 1].length += qc->pad_len;
4132 struct scatterlist *psg = &qc->pad_sgent;
4133 void *addr = kmap_atomic(psg->page, KM_IRQ0);
4134 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
4135 kunmap_atomic(addr, KM_IRQ0);
4139 dma_unmap_single(ap->dev,
4140 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
4143 sg->length += qc->pad_len;
4145 memcpy(qc->buf_virt + sg->length - qc->pad_len,
4146 pad_buf, qc->pad_len);
4149 qc->flags &= ~ATA_QCFLAG_DMAMAP;
4154 * ata_fill_sg - Fill PCI IDE PRD table
4155 * @qc: Metadata associated with taskfile to be transferred
4157 * Fill PCI IDE PRD (scatter-gather) table with segments
4158 * associated with the current disk command.
4161 * spin_lock_irqsave(host lock)
4164 static void ata_fill_sg(struct ata_queued_cmd *qc)
4166 struct ata_port *ap = qc->ap;
4167 struct scatterlist *sg;
4170 WARN_ON(qc->__sg == NULL);
4171 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
4174 ata_for_each_sg(sg, qc) {
4178 /* determine if physical DMA addr spans 64K boundary.
4179 * Note h/w doesn't support 64-bit, so we unconditionally
4180 * truncate dma_addr_t to u32.
4182 addr = (u32) sg_dma_address(sg);
4183 sg_len = sg_dma_len(sg);
4186 offset = addr & 0xffff;
4188 if ((offset + sg_len) > 0x10000)
4189 len = 0x10000 - offset;
4191 ap->prd[idx].addr = cpu_to_le32(addr);
4192 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
4193 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
4202 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
4206 * ata_fill_sg_dumb - Fill PCI IDE PRD table
4207 * @qc: Metadata associated with taskfile to be transferred
4209 * Fill PCI IDE PRD (scatter-gather) table with segments
4210 * associated with the current disk command. Perform the fill
4211 * so that we avoid writing any length 64K records for
4212 * controllers that don't follow the spec.
4215 * spin_lock_irqsave(host lock)
4218 static void ata_fill_sg_dumb(struct ata_queued_cmd *qc)
4220 struct ata_port *ap = qc->ap;
4221 struct scatterlist *sg;
4224 WARN_ON(qc->__sg == NULL);
4225 WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
4228 ata_for_each_sg(sg, qc) {
4230 u32 sg_len, len, blen;
4232 /* determine if physical DMA addr spans 64K boundary.
4233 * Note h/w doesn't support 64-bit, so we unconditionally
4234 * truncate dma_addr_t to u32.
4236 addr = (u32) sg_dma_address(sg);
4237 sg_len = sg_dma_len(sg);
4240 offset = addr & 0xffff;
4242 if ((offset + sg_len) > 0x10000)
4243 len = 0x10000 - offset;
4245 blen = len & 0xffff;
4246 ap->prd[idx].addr = cpu_to_le32(addr);
4248 /* Some PATA chipsets like the CS5530 can't
4249 cope with 0x0000 meaning 64K as the spec says */
4250 ap->prd[idx].flags_len = cpu_to_le32(0x8000);
4252 ap->prd[++idx].addr = cpu_to_le32(addr + 0x8000);
4254 ap->prd[idx].flags_len = cpu_to_le32(blen);
4255 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
4264 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
4268 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
4269 * @qc: Metadata associated with taskfile to check
4271 * Allow low-level driver to filter ATA PACKET commands, returning
4272 * a status indicating whether or not it is OK to use DMA for the
4273 * supplied PACKET command.
4276 * spin_lock_irqsave(host lock)
4278 * RETURNS: 0 when ATAPI DMA can be used
4281 int ata_check_atapi_dma(struct ata_queued_cmd *qc)
4283 struct ata_port *ap = qc->ap;
4285 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a
4286 * few ATAPI devices choke on such DMA requests.
4288 if (unlikely(qc->nbytes & 15))
4291 if (ap->ops->check_atapi_dma)
4292 return ap->ops->check_atapi_dma(qc);
4298 * ata_qc_prep - Prepare taskfile for submission
4299 * @qc: Metadata associated with taskfile to be prepared
4301 * Prepare ATA taskfile for submission.
4304 * spin_lock_irqsave(host lock)
4306 void ata_qc_prep(struct ata_queued_cmd *qc)
4308 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
4315 * ata_dumb_qc_prep - Prepare taskfile for submission
4316 * @qc: Metadata associated with taskfile to be prepared
4318 * Prepare ATA taskfile for submission.
4321 * spin_lock_irqsave(host lock)
4323 void ata_dumb_qc_prep(struct ata_queued_cmd *qc)
4325 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
4328 ata_fill_sg_dumb(qc);
4331 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4334 * ata_sg_init_one - Associate command with memory buffer
4335 * @qc: Command to be associated
4336 * @buf: Memory buffer
4337 * @buflen: Length of memory buffer, in bytes.
4339 * Initialize the data-related elements of queued_cmd @qc
4340 * to point to a single memory buffer, @buf of byte length @buflen.
4343 * spin_lock_irqsave(host lock)
4346 void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
4348 qc->flags |= ATA_QCFLAG_SINGLE;
4350 qc->__sg = &qc->sgent;
4352 qc->orig_n_elem = 1;
4354 qc->nbytes = buflen;
4356 sg_init_one(&qc->sgent, buf, buflen);
4360 * ata_sg_init - Associate command with scatter-gather table.
4361 * @qc: Command to be associated
4362 * @sg: Scatter-gather table.
4363 * @n_elem: Number of elements in s/g table.
4365 * Initialize the data-related elements of queued_cmd @qc
4366 * to point to a scatter-gather table @sg, containing @n_elem
4370 * spin_lock_irqsave(host lock)
4373 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4374 unsigned int n_elem)
4376 qc->flags |= ATA_QCFLAG_SG;
4378 qc->n_elem = n_elem;
4379 qc->orig_n_elem = n_elem;
4383 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
4384 * @qc: Command with memory buffer to be mapped.
4386 * DMA-map the memory buffer associated with queued_cmd @qc.
4389 * spin_lock_irqsave(host lock)
4392 * Zero on success, negative on error.
4395 static int ata_sg_setup_one(struct ata_queued_cmd *qc)
4397 struct ata_port *ap = qc->ap;
4398 int dir = qc->dma_dir;
4399 struct scatterlist *sg = qc->__sg;
4400 dma_addr_t dma_address;
4403 /* we must lengthen transfers to end on a 32-bit boundary */
4404 qc->pad_len = sg->length & 3;
4406 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4407 struct scatterlist *psg = &qc->pad_sgent;
4409 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4411 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
4413 if (qc->tf.flags & ATA_TFLAG_WRITE)
4414 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
4417 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
4418 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
4420 sg->length -= qc->pad_len;
4421 if (sg->length == 0)
4424 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
4425 sg->length, qc->pad_len);
4433 dma_address = dma_map_single(ap->dev, qc->buf_virt,
4435 if (dma_mapping_error(dma_address)) {
4437 sg->length += qc->pad_len;
4441 sg_dma_address(sg) = dma_address;
4442 sg_dma_len(sg) = sg->length;
4445 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
4446 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4452 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
4453 * @qc: Command with scatter-gather table to be mapped.
4455 * DMA-map the scatter-gather table associated with queued_cmd @qc.
4458 * spin_lock_irqsave(host lock)
4461 * Zero on success, negative on error.
4465 static int ata_sg_setup(struct ata_queued_cmd *qc)
4467 struct ata_port *ap = qc->ap;
4468 struct scatterlist *sg = qc->__sg;
4469 struct scatterlist *lsg = &sg[qc->n_elem - 1];
4470 int n_elem, pre_n_elem, dir, trim_sg = 0;
4472 VPRINTK("ENTER, ata%u\n", ap->print_id);
4473 WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
4475 /* we must lengthen transfers to end on a 32-bit boundary */
4476 qc->pad_len = lsg->length & 3;
4478 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
4479 struct scatterlist *psg = &qc->pad_sgent;
4480 unsigned int offset;
4482 WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4484 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
4487 * psg->page/offset are used to copy to-be-written
4488 * data in this function or read data in ata_sg_clean.
4490 offset = lsg->offset + lsg->length - qc->pad_len;
4491 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
4492 psg->offset = offset_in_page(offset);
4494 if (qc->tf.flags & ATA_TFLAG_WRITE) {
4495 void *addr = kmap_atomic(psg->page, KM_IRQ0);
4496 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
4497 kunmap_atomic(addr, KM_IRQ0);
4500 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
4501 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
4503 lsg->length -= qc->pad_len;
4504 if (lsg->length == 0)
4507 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
4508 qc->n_elem - 1, lsg->length, qc->pad_len);
4511 pre_n_elem = qc->n_elem;
4512 if (trim_sg && pre_n_elem)
4521 n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4523 /* restore last sg */
4524 lsg->length += qc->pad_len;
4528 DPRINTK("%d sg elements mapped\n", n_elem);
4531 qc->n_elem = n_elem;
4537 * swap_buf_le16 - swap halves of 16-bit words in place
4538 * @buf: Buffer to swap
4539 * @buf_words: Number of 16-bit words in buffer.
4541 * Swap halves of 16-bit words if needed to convert from
4542 * little-endian byte order to native cpu byte order, or
4546 * Inherited from caller.
4548 void swap_buf_le16(u16 *buf, unsigned int buf_words)
4553 for (i = 0; i < buf_words; i++)
4554 buf[i] = le16_to_cpu(buf[i]);
4555 #endif /* __BIG_ENDIAN */
4559 * ata_data_xfer - Transfer data by PIO
4560 * @adev: device to target
4562 * @buflen: buffer length
4563 * @write_data: read/write
4565 * Transfer data from/to the device data register by PIO.
4568 * Inherited from caller.
4570 void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
4571 unsigned int buflen, int write_data)
4573 struct ata_port *ap = adev->link->ap;
4574 unsigned int words = buflen >> 1;
4576 /* Transfer multiple of 2 bytes */
4578 iowrite16_rep(ap->ioaddr.data_addr, buf, words);
4580 ioread16_rep(ap->ioaddr.data_addr, buf, words);
4582 /* Transfer trailing 1 byte, if any. */
4583 if (unlikely(buflen & 0x01)) {
4584 u16 align_buf[1] = { 0 };
4585 unsigned char *trailing_buf = buf + buflen - 1;
4588 memcpy(align_buf, trailing_buf, 1);
4589 iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
4591 align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
4592 memcpy(trailing_buf, align_buf, 1);
4598 * ata_data_xfer_noirq - Transfer data by PIO
4599 * @adev: device to target
4601 * @buflen: buffer length
4602 * @write_data: read/write
4604 * Transfer data from/to the device data register by PIO. Do the
4605 * transfer with interrupts disabled.
4608 * Inherited from caller.
4610 void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
4611 unsigned int buflen, int write_data)
4613 unsigned long flags;
4614 local_irq_save(flags);
4615 ata_data_xfer(adev, buf, buflen, write_data);
4616 local_irq_restore(flags);
4621 * ata_pio_sector - Transfer a sector of data.
4622 * @qc: Command on going
4624 * Transfer qc->sect_size bytes of data from/to the ATA device.
4627 * Inherited from caller.
4630 static void ata_pio_sector(struct ata_queued_cmd *qc)
4632 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4633 struct scatterlist *sg = qc->__sg;
4634 struct ata_port *ap = qc->ap;
4636 unsigned int offset;
4639 if (qc->curbytes == qc->nbytes - qc->sect_size)
4640 ap->hsm_task_state = HSM_ST_LAST;
4642 page = sg[qc->cursg].page;
4643 offset = sg[qc->cursg].offset + qc->cursg_ofs;
4645 /* get the current page and offset */
4646 page = nth_page(page, (offset >> PAGE_SHIFT));
4647 offset %= PAGE_SIZE;
4649 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4651 if (PageHighMem(page)) {
4652 unsigned long flags;
4654 /* FIXME: use a bounce buffer */
4655 local_irq_save(flags);
4656 buf = kmap_atomic(page, KM_IRQ0);
4658 /* do the actual data transfer */
4659 ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4661 kunmap_atomic(buf, KM_IRQ0);
4662 local_irq_restore(flags);
4664 buf = page_address(page);
4665 ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4668 qc->curbytes += qc->sect_size;
4669 qc->cursg_ofs += qc->sect_size;
4671 if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
4678 * ata_pio_sectors - Transfer one or many sectors.
4679 * @qc: Command on going
4681 * Transfer one or many sectors of data from/to the
4682 * ATA device for the DRQ request.
4685 * Inherited from caller.
4688 static void ata_pio_sectors(struct ata_queued_cmd *qc)
4690 if (is_multi_taskfile(&qc->tf)) {
4691 /* READ/WRITE MULTIPLE */
4694 WARN_ON(qc->dev->multi_count == 0);
4696 nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
4697 qc->dev->multi_count);
4703 ata_altstatus(qc->ap); /* flush */
4707 * atapi_send_cdb - Write CDB bytes to hardware
4708 * @ap: Port to which ATAPI device is attached.
4709 * @qc: Taskfile currently active
4711 * When device has indicated its readiness to accept
4712 * a CDB, this function is called. Send the CDB.
4718 static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
4721 DPRINTK("send cdb\n");
4722 WARN_ON(qc->dev->cdb_len < 12);
4724 ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4725 ata_altstatus(ap); /* flush */
4727 switch (qc->tf.protocol) {
4728 case ATA_PROT_ATAPI:
4729 ap->hsm_task_state = HSM_ST;
4731 case ATA_PROT_ATAPI_NODATA:
4732 ap->hsm_task_state = HSM_ST_LAST;
4734 case ATA_PROT_ATAPI_DMA:
4735 ap->hsm_task_state = HSM_ST_LAST;
4736 /* initiate bmdma */
4737 ap->ops->bmdma_start(qc);
4743 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
4744 * @qc: Command on going
4745 * @bytes: number of bytes
4747 * Transfer Transfer data from/to the ATAPI device.
4750 * Inherited from caller.
4754 static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
4756 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4757 struct scatterlist *sg = qc->__sg;
4758 struct ata_port *ap = qc->ap;
4761 unsigned int offset, count;
4763 if (qc->curbytes + bytes >= qc->nbytes)
4764 ap->hsm_task_state = HSM_ST_LAST;
4767 if (unlikely(qc->cursg >= qc->n_elem)) {
4769 * The end of qc->sg is reached and the device expects
4770 * more data to transfer. In order not to overrun qc->sg
4771 * and fulfill length specified in the byte count register,
4772 * - for read case, discard trailing data from the device
4773 * - for write case, padding zero data to the device
4775 u16 pad_buf[1] = { 0 };
4776 unsigned int words = bytes >> 1;
4779 if (words) /* warning if bytes > 1 */
4780 ata_dev_printk(qc->dev, KERN_WARNING,
4781 "%u bytes trailing data\n", bytes);
4783 for (i = 0; i < words; i++)
4784 ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4786 ap->hsm_task_state = HSM_ST_LAST;
4790 sg = &qc->__sg[qc->cursg];
4793 offset = sg->offset + qc->cursg_ofs;
4795 /* get the current page and offset */
4796 page = nth_page(page, (offset >> PAGE_SHIFT));
4797 offset %= PAGE_SIZE;
4799 /* don't overrun current sg */
4800 count = min(sg->length - qc->cursg_ofs, bytes);
4802 /* don't cross page boundaries */
4803 count = min(count, (unsigned int)PAGE_SIZE - offset);
4805 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
4807 if (PageHighMem(page)) {
4808 unsigned long flags;
4810 /* FIXME: use bounce buffer */
4811 local_irq_save(flags);
4812 buf = kmap_atomic(page, KM_IRQ0);
4814 /* do the actual data transfer */
4815 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
4817 kunmap_atomic(buf, KM_IRQ0);
4818 local_irq_restore(flags);
4820 buf = page_address(page);
4821 ap->ops->data_xfer(qc->dev, buf + offset, count, do_write);
4825 qc->curbytes += count;
4826 qc->cursg_ofs += count;
4828 if (qc->cursg_ofs == sg->length) {
4838 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
4839 * @qc: Command on going
4841 * Transfer Transfer data from/to the ATAPI device.
4844 * Inherited from caller.
4847 static void atapi_pio_bytes(struct ata_queued_cmd *qc)
4849 struct ata_port *ap = qc->ap;
4850 struct ata_device *dev = qc->dev;
4851 unsigned int ireason, bc_lo, bc_hi, bytes;
4852 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
4854 /* Abuse qc->result_tf for temp storage of intermediate TF
4855 * here to save some kernel stack usage.
4856 * For normal completion, qc->result_tf is not relevant. For
4857 * error, qc->result_tf is later overwritten by ata_qc_complete().
4858 * So, the correctness of qc->result_tf is not affected.
4860 ap->ops->tf_read(ap, &qc->result_tf);
4861 ireason = qc->result_tf.nsect;
4862 bc_lo = qc->result_tf.lbam;
4863 bc_hi = qc->result_tf.lbah;
4864 bytes = (bc_hi << 8) | bc_lo;
4866 /* shall be cleared to zero, indicating xfer of data */
4867 if (ireason & (1 << 0))
4870 /* make sure transfer direction matches expected */
4871 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
4872 if (do_write != i_write)
4875 VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4877 __atapi_pio_bytes(qc, bytes);
4878 ata_altstatus(ap); /* flush */
4883 ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4884 qc->err_mask |= AC_ERR_HSM;
4885 ap->hsm_task_state = HSM_ST_ERR;
4889 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
4890 * @ap: the target ata_port
4894 * 1 if ok in workqueue, 0 otherwise.
4897 static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
4899 if (qc->tf.flags & ATA_TFLAG_POLLING)
4902 if (ap->hsm_task_state == HSM_ST_FIRST) {
4903 if (qc->tf.protocol == ATA_PROT_PIO &&
4904 (qc->tf.flags & ATA_TFLAG_WRITE))
4907 if (is_atapi_taskfile(&qc->tf) &&
4908 !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4916 * ata_hsm_qc_complete - finish a qc running on standard HSM
4917 * @qc: Command to complete
4918 * @in_wq: 1 if called from workqueue, 0 otherwise
4920 * Finish @qc which is running on standard HSM.
4923 * If @in_wq is zero, spin_lock_irqsave(host lock).
4924 * Otherwise, none on entry and grabs host lock.
4926 static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
4928 struct ata_port *ap = qc->ap;
4929 unsigned long flags;
4931 if (ap->ops->error_handler) {
4933 spin_lock_irqsave(ap->lock, flags);
4935 /* EH might have kicked in while host lock is
4938 qc = ata_qc_from_tag(ap, qc->tag);
4940 if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4941 ap->ops->irq_on(ap);
4942 ata_qc_complete(qc);
4944 ata_port_freeze(ap);
4947 spin_unlock_irqrestore(ap->lock, flags);
4949 if (likely(!(qc->err_mask & AC_ERR_HSM)))
4950 ata_qc_complete(qc);
4952 ata_port_freeze(ap);
4956 spin_lock_irqsave(ap->lock, flags);
4957 ap->ops->irq_on(ap);
4958 ata_qc_complete(qc);
4959 spin_unlock_irqrestore(ap->lock, flags);
4961 ata_qc_complete(qc);
4966 * ata_hsm_move - move the HSM to the next state.
4967 * @ap: the target ata_port
4969 * @status: current device status
4970 * @in_wq: 1 if called from workqueue, 0 otherwise
4973 * 1 when poll next status needed, 0 otherwise.
4975 int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
4976 u8 status, int in_wq)
4978 unsigned long flags = 0;
4981 WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
4983 /* Make sure ata_qc_issue_prot() does not throw things
4984 * like DMA polling into the workqueue. Notice that
4985 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
4987 WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4990 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4991 ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4993 switch (ap->hsm_task_state) {
4995 /* Send first data block or PACKET CDB */
4997 /* If polling, we will stay in the work queue after
4998 * sending the data. Otherwise, interrupt handler
4999 * takes over after sending the data.
5001 poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
5003 /* check device status */
5004 if (unlikely((status & ATA_DRQ) == 0)) {
5005 /* handle BSY=0, DRQ=0 as error */
5006 if (likely(status & (ATA_ERR | ATA_DF)))
5007 /* device stops HSM for abort/error */
5008 qc->err_mask |= AC_ERR_DEV;
5010 /* HSM violation. Let EH handle this */
5011 qc->err_mask |= AC_ERR_HSM;
5013 ap->hsm_task_state = HSM_ST_ERR;
5017 /* Device should not ask for data transfer (DRQ=1)
5018 * when it finds something wrong.
5019 * We ignore DRQ here and stop the HSM by
5020 * changing hsm_task_state to HSM_ST_ERR and
5021 * let the EH abort the command or reset the device.
5023 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5024 ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
5025 "error, dev_stat 0x%X\n", status);
5026 qc->err_mask |= AC_ERR_HSM;
5027 ap->hsm_task_state = HSM_ST_ERR;
5031 /* Send the CDB (atapi) or the first data block (ata pio out).
5032 * During the state transition, interrupt handler shouldn't
5033 * be invoked before the data transfer is complete and
5034 * hsm_task_state is changed. Hence, the following locking.
5037 spin_lock_irqsave(ap->lock, flags);
5039 if (qc->tf.protocol == ATA_PROT_PIO) {
5040 /* PIO data out protocol.
5041 * send first data block.
5044 /* ata_pio_sectors() might change the state
5045 * to HSM_ST_LAST. so, the state is changed here
5046 * before ata_pio_sectors().
5048 ap->hsm_task_state = HSM_ST;
5049 ata_pio_sectors(qc);
5052 atapi_send_cdb(ap, qc);
5055 spin_unlock_irqrestore(ap->lock, flags);
5057 /* if polling, ata_pio_task() handles the rest.
5058 * otherwise, interrupt handler takes over from here.
5063 /* complete command or read/write the data register */
5064 if (qc->tf.protocol == ATA_PROT_ATAPI) {
5065 /* ATAPI PIO protocol */
5066 if ((status & ATA_DRQ) == 0) {
5067 /* No more data to transfer or device error.
5068 * Device error will be tagged in HSM_ST_LAST.
5070 ap->hsm_task_state = HSM_ST_LAST;
5074 /* Device should not ask for data transfer (DRQ=1)
5075 * when it finds something wrong.
5076 * We ignore DRQ here and stop the HSM by
5077 * changing hsm_task_state to HSM_ST_ERR and
5078 * let the EH abort the command or reset the device.
5080 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5081 ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
5082 "device error, dev_stat 0x%X\n",
5084 qc->err_mask |= AC_ERR_HSM;
5085 ap->hsm_task_state = HSM_ST_ERR;
5089 atapi_pio_bytes(qc);
5091 if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
5092 /* bad ireason reported by device */
5096 /* ATA PIO protocol */
5097 if (unlikely((status & ATA_DRQ) == 0)) {
5098 /* handle BSY=0, DRQ=0 as error */
5099 if (likely(status & (ATA_ERR | ATA_DF)))
5100 /* device stops HSM for abort/error */
5101 qc->err_mask |= AC_ERR_DEV;
5103 /* HSM violation. Let EH handle this.
5104 * Phantom devices also trigger this
5105 * condition. Mark hint.
5107 qc->err_mask |= AC_ERR_HSM |
5110 ap->hsm_task_state = HSM_ST_ERR;
5114 /* For PIO reads, some devices may ask for
5115 * data transfer (DRQ=1) alone with ERR=1.
5116 * We respect DRQ here and transfer one
5117 * block of junk data before changing the
5118 * hsm_task_state to HSM_ST_ERR.
5120 * For PIO writes, ERR=1 DRQ=1 doesn't make
5121 * sense since the data block has been
5122 * transferred to the device.
5124 if (unlikely(status & (ATA_ERR | ATA_DF))) {
5125 /* data might be corrputed */
5126 qc->err_mask |= AC_ERR_DEV;
5128 if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
5129 ata_pio_sectors(qc);
5130 status = ata_wait_idle(ap);
5133 if (status & (ATA_BUSY | ATA_DRQ))
5134 qc->err_mask |= AC_ERR_HSM;
5136 /* ata_pio_sectors() might change the
5137 * state to HSM_ST_LAST. so, the state
5138 * is changed after ata_pio_sectors().
5140 ap->hsm_task_state = HSM_ST_ERR;
5144 ata_pio_sectors(qc);
5146 if (ap->hsm_task_state == HSM_ST_LAST &&
5147 (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
5149 status = ata_wait_idle(ap);
5158 if (unlikely(!ata_ok(status))) {
5159 qc->err_mask |= __ac_err_mask(status);
5160 ap->hsm_task_state = HSM_ST_ERR;
5164 /* no more data to transfer */
5165 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
5166 ap->print_id, qc->dev->devno, status);
5168 WARN_ON(qc->err_mask);
5170 ap->hsm_task_state = HSM_ST_IDLE;
5172 /* complete taskfile transaction */
5173 ata_hsm_qc_complete(qc, in_wq);
5179 /* make sure qc->err_mask is available to
5180 * know what's wrong and recover
5182 WARN_ON(qc->err_mask == 0);
5184 ap->hsm_task_state = HSM_ST_IDLE;
5186 /* complete taskfile transaction */
5187 ata_hsm_qc_complete(qc, in_wq);
5199 static void ata_pio_task(struct work_struct *work)
5201 struct ata_port *ap =
5202 container_of(work, struct ata_port, port_task.work);
5203 struct ata_queued_cmd *qc = ap->port_task_data;
5208 WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5211 * This is purely heuristic. This is a fast path.
5212 * Sometimes when we enter, BSY will be cleared in
5213 * a chk-status or two. If not, the drive is probably seeking
5214 * or something. Snooze for a couple msecs, then
5215 * chk-status again. If still busy, queue delayed work.
5217 status = ata_busy_wait(ap, ATA_BUSY, 5);
5218 if (status & ATA_BUSY) {
5220 status = ata_busy_wait(ap, ATA_BUSY, 10);
5221 if (status & ATA_BUSY) {
5222 ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5228 poll_next = ata_hsm_move(ap, qc, status, 1);
5230 /* another command or interrupt handler
5231 * may be running at this point.
5238 * ata_qc_new - Request an available ATA command, for queueing
5239 * @ap: Port associated with device @dev
5240 * @dev: Device from whom we request an available command structure
5246 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
5248 struct ata_queued_cmd *qc = NULL;
5251 /* no command while frozen */
5252 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5255 /* the last tag is reserved for internal command. */
5256 for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5257 if (!test_and_set_bit(i, &ap->qc_allocated)) {
5258 qc = __ata_qc_from_tag(ap, i);
5269 * ata_qc_new_init - Request an available ATA command, and initialize it
5270 * @dev: Device from whom we request an available command structure
5276 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
5278 struct ata_port *ap = dev->link->ap;
5279 struct ata_queued_cmd *qc;
5281 qc = ata_qc_new(ap);
5294 * ata_qc_free - free unused ata_queued_cmd
5295 * @qc: Command to complete
5297 * Designed to free unused ata_queued_cmd object
5298 * in case something prevents using it.
5301 * spin_lock_irqsave(host lock)
5303 void ata_qc_free(struct ata_queued_cmd *qc)
5305 struct ata_port *ap = qc->ap;
5308 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5312 if (likely(ata_tag_valid(tag))) {
5313 qc->tag = ATA_TAG_POISON;
5314 clear_bit(tag, &ap->qc_allocated);
5318 void __ata_qc_complete(struct ata_queued_cmd *qc)
5320 struct ata_port *ap = qc->ap;
5321 struct ata_link *link = qc->dev->link;
5323 WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5324 WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
5326 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
5329 /* command should be marked inactive atomically with qc completion */
5330 if (qc->tf.protocol == ATA_PROT_NCQ)
5331 link->sactive &= ~(1 << qc->tag);
5333 link->active_tag = ATA_TAG_POISON;
5335 /* atapi: mark qc as inactive to prevent the interrupt handler
5336 * from completing the command twice later, before the error handler
5337 * is called. (when rc != 0 and atapi request sense is needed)
5339 qc->flags &= ~ATA_QCFLAG_ACTIVE;
5340 ap->qc_active &= ~(1 << qc->tag);
5342 /* call completion callback */
5343 qc->complete_fn(qc);
5346 static void fill_result_tf(struct ata_queued_cmd *qc)
5348 struct ata_port *ap = qc->ap;
5350 qc->result_tf.flags = qc->tf.flags;
5351 ap->ops->tf_read(ap, &qc->result_tf);
5355 * ata_qc_complete - Complete an active ATA command
5356 * @qc: Command to complete
5357 * @err_mask: ATA Status register contents
5359 * Indicate to the mid and upper layers that an ATA
5360 * command has completed, with either an ok or not-ok status.
5363 * spin_lock_irqsave(host lock)
5365 void ata_qc_complete(struct ata_queued_cmd *qc)
5367 struct ata_port *ap = qc->ap;
5369 /* XXX: New EH and old EH use different mechanisms to
5370 * synchronize EH with regular execution path.
5372 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
5373 * Normal execution path is responsible for not accessing a
5374 * failed qc. libata core enforces the rule by returning NULL
5375 * from ata_qc_from_tag() for failed qcs.
5377 * Old EH depends on ata_qc_complete() nullifying completion
5378 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
5379 * not synchronize with interrupt handler. Only PIO task is
5382 if (ap->ops->error_handler) {
5383 WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5385 if (unlikely(qc->err_mask))
5386 qc->flags |= ATA_QCFLAG_FAILED;
5388 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
5389 if (!ata_tag_internal(qc->tag)) {
5390 /* always fill result TF for failed qc */
5392 ata_qc_schedule_eh(qc);
5397 /* read result TF if requested */
5398 if (qc->flags & ATA_QCFLAG_RESULT_TF)
5401 __ata_qc_complete(qc);
5403 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
5406 /* read result TF if failed or requested */
5407 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
5410 __ata_qc_complete(qc);
5415 * ata_qc_complete_multiple - Complete multiple qcs successfully
5416 * @ap: port in question
5417 * @qc_active: new qc_active mask
5418 * @finish_qc: LLDD callback invoked before completing a qc
5420 * Complete in-flight commands. This functions is meant to be
5421 * called from low-level driver's interrupt routine to complete
5422 * requests normally. ap->qc_active and @qc_active is compared
5423 * and commands are completed accordingly.
5426 * spin_lock_irqsave(host lock)
5429 * Number of completed commands on success, -errno otherwise.
5431 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
5432 void (*finish_qc)(struct ata_queued_cmd *))
5438 done_mask = ap->qc_active ^ qc_active;
5440 if (unlikely(done_mask & qc_active)) {
5441 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
5442 "(%08x->%08x)\n", ap->qc_active, qc_active);
5446 for (i = 0; i < ATA_MAX_QUEUE; i++) {
5447 struct ata_queued_cmd *qc;
5449 if (!(done_mask & (1 << i)))
5452 if ((qc = ata_qc_from_tag(ap, i))) {
5455 ata_qc_complete(qc);
5463 static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
5465 struct ata_port *ap = qc->ap;
5467 switch (qc->tf.protocol) {
5470 case ATA_PROT_ATAPI_DMA:
5473 case ATA_PROT_ATAPI:
5475 if (ap->flags & ATA_FLAG_PIO_DMA)
5488 * ata_qc_issue - issue taskfile to device
5489 * @qc: command to issue to device
5491 * Prepare an ATA command to submission to device.
5492 * This includes mapping the data into a DMA-able
5493 * area, filling in the S/G table, and finally
5494 * writing the taskfile to hardware, starting the command.
5497 * spin_lock_irqsave(host lock)
5499 void ata_qc_issue(struct ata_queued_cmd *qc)
5501 struct ata_port *ap = qc->ap;
5502 struct ata_link *link = qc->dev->link;
5504 /* Make sure only one non-NCQ command is outstanding. The
5505 * check is skipped for old EH because it reuses active qc to
5506 * request ATAPI sense.
5508 WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5510 if (qc->tf.protocol == ATA_PROT_NCQ) {
5511 WARN_ON(link->sactive & (1 << qc->tag));
5512 link->sactive |= 1 << qc->tag;
5514 WARN_ON(link->sactive);
5515 link->active_tag = qc->tag;
5518 qc->flags |= ATA_QCFLAG_ACTIVE;
5519 ap->qc_active |= 1 << qc->tag;
5521 if (ata_should_dma_map(qc)) {
5522 if (qc->flags & ATA_QCFLAG_SG) {
5523 if (ata_sg_setup(qc))
5525 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
5526 if (ata_sg_setup_one(qc))
5530 qc->flags &= ~ATA_QCFLAG_DMAMAP;
5533 ap->ops->qc_prep(qc);
5535 qc->err_mask |= ap->ops->qc_issue(qc);
5536 if (unlikely(qc->err_mask))
5541 qc->flags &= ~ATA_QCFLAG_DMAMAP;
5542 qc->err_mask |= AC_ERR_SYSTEM;
5544 ata_qc_complete(qc);
5548 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
5549 * @qc: command to issue to device
5551 * Using various libata functions and hooks, this function
5552 * starts an ATA command. ATA commands are grouped into
5553 * classes called "protocols", and issuing each type of protocol
5554 * is slightly different.
5556 * May be used as the qc_issue() entry in ata_port_operations.
5559 * spin_lock_irqsave(host lock)
5562 * Zero on success, AC_ERR_* mask on failure
5565 unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
5567 struct ata_port *ap = qc->ap;
5569 /* Use polling pio if the LLD doesn't handle
5570 * interrupt driven pio and atapi CDB interrupt.
5572 if (ap->flags & ATA_FLAG_PIO_POLLING) {
5573 switch (qc->tf.protocol) {
5575 case ATA_PROT_NODATA:
5576 case ATA_PROT_ATAPI:
5577 case ATA_PROT_ATAPI_NODATA:
5578 qc->tf.flags |= ATA_TFLAG_POLLING;
5580 case ATA_PROT_ATAPI_DMA:
5581 if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
5582 /* see ata_dma_blacklisted() */
5590 /* select the device */
5591 ata_dev_select(ap, qc->dev->devno, 1, 0);
5593 /* start the command */
5594 switch (qc->tf.protocol) {
5595 case ATA_PROT_NODATA:
5596 if (qc->tf.flags & ATA_TFLAG_POLLING)
5597 ata_qc_set_polling(qc);
5599 ata_tf_to_host(ap, &qc->tf);
5600 ap->hsm_task_state = HSM_ST_LAST;
5602 if (qc->tf.flags & ATA_TFLAG_POLLING)
5603 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5608 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5610 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
5611 ap->ops->bmdma_setup(qc); /* set up bmdma */
5612 ap->ops->bmdma_start(qc); /* initiate bmdma */
5613 ap->hsm_task_state = HSM_ST_LAST;
5617 if (qc->tf.flags & ATA_TFLAG_POLLING)
5618 ata_qc_set_polling(qc);
5620 ata_tf_to_host(ap, &qc->tf);
5622 if (qc->tf.flags & ATA_TFLAG_WRITE) {
5623 /* PIO data out protocol */
5624 ap->hsm_task_state = HSM_ST_FIRST;
5625 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5627 /* always send first data block using
5628 * the ata_pio_task() codepath.
5631 /* PIO data in protocol */
5632 ap->hsm_task_state = HSM_ST;
5634 if (qc->tf.flags & ATA_TFLAG_POLLING)
5635 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5637 /* if polling, ata_pio_task() handles the rest.
5638 * otherwise, interrupt handler takes over from here.
5644 case ATA_PROT_ATAPI:
5645 case ATA_PROT_ATAPI_NODATA:
5646 if (qc->tf.flags & ATA_TFLAG_POLLING)
5647 ata_qc_set_polling(qc);
5649 ata_tf_to_host(ap, &qc->tf);
5651 ap->hsm_task_state = HSM_ST_FIRST;
5653 /* send cdb by polling if no cdb interrupt */
5654 if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
5655 (qc->tf.flags & ATA_TFLAG_POLLING))
5656 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5659 case ATA_PROT_ATAPI_DMA:
5660 WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5662 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
5663 ap->ops->bmdma_setup(qc); /* set up bmdma */
5664 ap->hsm_task_state = HSM_ST_FIRST;
5666 /* send cdb by polling if no cdb interrupt */
5667 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5668 ata_port_queue_task(ap, ata_pio_task, qc, 0);
5673 return AC_ERR_SYSTEM;
5680 * ata_host_intr - Handle host interrupt for given (port, task)
5681 * @ap: Port on which interrupt arrived (possibly...)
5682 * @qc: Taskfile currently active in engine
5684 * Handle host interrupt for given queued command. Currently,
5685 * only DMA interrupts are handled. All other commands are
5686 * handled via polling with interrupts disabled (nIEN bit).
5689 * spin_lock_irqsave(host lock)
5692 * One if interrupt was handled, zero if not (shared irq).
5695 inline unsigned int ata_host_intr (struct ata_port *ap,
5696 struct ata_queued_cmd *qc)
5698 struct ata_eh_info *ehi = &ap->link.eh_info;
5699 u8 status, host_stat = 0;
5701 VPRINTK("ata%u: protocol %d task_state %d\n",
5702 ap->print_id, qc->tf.protocol, ap->hsm_task_state);
5704 /* Check whether we are expecting interrupt in this state */
5705 switch (ap->hsm_task_state) {
5707 /* Some pre-ATAPI-4 devices assert INTRQ
5708 * at this state when ready to receive CDB.
5711 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
5712 * The flag was turned on only for atapi devices.
5713 * No need to check is_atapi_taskfile(&qc->tf) again.
5715 if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5719 if (qc->tf.protocol == ATA_PROT_DMA ||
5720 qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
5721 /* check status of DMA engine */
5722 host_stat = ap->ops->bmdma_status(ap);
5723 VPRINTK("ata%u: host_stat 0x%X\n",
5724 ap->print_id, host_stat);
5726 /* if it's not our irq... */
5727 if (!(host_stat & ATA_DMA_INTR))
5730 /* before we do anything else, clear DMA-Start bit */
5731 ap->ops->bmdma_stop(qc);
5733 if (unlikely(host_stat & ATA_DMA_ERR)) {
5734 /* error when transfering data to/from memory */
5735 qc->err_mask |= AC_ERR_HOST_BUS;
5736 ap->hsm_task_state = HSM_ST_ERR;
5746 /* check altstatus */
5747 status = ata_altstatus(ap);
5748 if (status & ATA_BUSY)
5751 /* check main status, clearing INTRQ */
5752 status = ata_chk_status(ap);
5753 if (unlikely(status & ATA_BUSY))
5756 /* ack bmdma irq events */
5757 ap->ops->irq_clear(ap);
5759 ata_hsm_move(ap, qc, status, 0);
5761 if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA ||
5762 qc->tf.protocol == ATA_PROT_ATAPI_DMA))
5763 ata_ehi_push_desc(ehi, "BMDMA stat 0x%x", host_stat);
5765 return 1; /* irq handled */
5768 ap->stats.idle_irq++;
5771 if ((ap->stats.idle_irq % 1000) == 0) {
5773 ap->ops->irq_clear(ap);
5774 ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5778 return 0; /* irq not handled */
5782 * ata_interrupt - Default ATA host interrupt handler
5783 * @irq: irq line (unused)
5784 * @dev_instance: pointer to our ata_host information structure
5786 * Default interrupt handler for PCI IDE devices. Calls
5787 * ata_host_intr() for each port that is not disabled.
5790 * Obtains host lock during operation.
5793 * IRQ_NONE or IRQ_HANDLED.
5796 irqreturn_t ata_interrupt (int irq, void *dev_instance)
5798 struct ata_host *host = dev_instance;
5800 unsigned int handled = 0;
5801 unsigned long flags;
5803 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
5804 spin_lock_irqsave(&host->lock, flags);
5806 for (i = 0; i < host->n_ports; i++) {
5807 struct ata_port *ap;
5809 ap = host->ports[i];
5811 !(ap->flags & ATA_FLAG_DISABLED)) {
5812 struct ata_queued_cmd *qc;
5814 qc = ata_qc_from_tag(ap, ap->link.active_tag);
5815 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5816 (qc->flags & ATA_QCFLAG_ACTIVE))
5817 handled |= ata_host_intr(ap, qc);
5821 spin_unlock_irqrestore(&host->lock, flags);
5823 return IRQ_RETVAL(handled);
5827 * sata_scr_valid - test whether SCRs are accessible
5828 * @link: ATA link to test SCR accessibility for
5830 * Test whether SCRs are accessible for @link.
5836 * 1 if SCRs are accessible, 0 otherwise.
5838 int sata_scr_valid(struct ata_link *link)
5840 struct ata_port *ap = link->ap;
5842 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5846 * sata_scr_read - read SCR register of the specified port
5847 * @link: ATA link to read SCR for
5849 * @val: Place to store read value
5851 * Read SCR register @reg of @link into *@val. This function is
5852 * guaranteed to succeed if the cable type of the port is SATA
5853 * and the port implements ->scr_read.
5859 * 0 on success, negative errno on failure.
5861 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5863 struct ata_port *ap = link->ap;
5865 if (sata_scr_valid(link))
5866 return ap->ops->scr_read(ap, reg, val);
5871 * sata_scr_write - write SCR register of the specified port
5872 * @link: ATA link to write SCR for
5873 * @reg: SCR to write
5874 * @val: value to write
5876 * Write @val to SCR register @reg of @link. This function is
5877 * guaranteed to succeed if the cable type of the port is SATA
5878 * and the port implements ->scr_read.
5884 * 0 on success, negative errno on failure.
5886 int sata_scr_write(struct ata_link *link, int reg, u32 val)
5888 struct ata_port *ap = link->ap;
5890 if (sata_scr_valid(link))
5891 return ap->ops->scr_write(ap, reg, val);
5896 * sata_scr_write_flush - write SCR register of the specified port and flush
5897 * @link: ATA link to write SCR for
5898 * @reg: SCR to write
5899 * @val: value to write
5901 * This function is identical to sata_scr_write() except that this
5902 * function performs flush after writing to the register.
5908 * 0 on success, negative errno on failure.
5910 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5912 struct ata_port *ap = link->ap;
5915 if (sata_scr_valid(link)) {
5916 rc = ap->ops->scr_write(ap, reg, val);
5918 rc = ap->ops->scr_read(ap, reg, &val);
5925 * ata_link_online - test whether the given link is online
5926 * @link: ATA link to test
5928 * Test whether @link is online. Note that this function returns
5929 * 0 if online status of @link cannot be obtained, so
5930 * ata_link_online(link) != !ata_link_offline(link).
5936 * 1 if the port online status is available and online.
5938 int ata_link_online(struct ata_link *link)
5942 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5943 (sstatus & 0xf) == 0x3)
5949 * ata_link_offline - test whether the given link is offline
5950 * @link: ATA link to test
5952 * Test whether @link is offline. Note that this function
5953 * returns 0 if offline status of @link cannot be obtained, so
5954 * ata_link_online(link) != !ata_link_offline(link).
5960 * 1 if the port offline status is available and offline.
5962 int ata_link_offline(struct ata_link *link)
5966 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5967 (sstatus & 0xf) != 0x3)
5972 int ata_flush_cache(struct ata_device *dev)
5974 unsigned int err_mask;
5977 if (!ata_try_flush_cache(dev))
5980 if (dev->flags & ATA_DFLAG_FLUSH_EXT)
5981 cmd = ATA_CMD_FLUSH_EXT;
5983 cmd = ATA_CMD_FLUSH;
5985 /* This is wrong. On a failed flush we get back the LBA of the lost
5986 sector and we should (assuming it wasn't aborted as unknown) issue
5987 a further flush command to continue the writeback until it
5989 err_mask = ata_do_simple_cmd(dev, cmd);
5991 ata_dev_printk(dev, KERN_ERR, "failed to flush cache\n");
5999 static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
6000 unsigned int action, unsigned int ehi_flags,
6003 unsigned long flags;
6006 for (i = 0; i < host->n_ports; i++) {
6007 struct ata_port *ap = host->ports[i];
6008 struct ata_link *link;
6010 /* Previous resume operation might still be in
6011 * progress. Wait for PM_PENDING to clear.
6013 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
6014 ata_port_wait_eh(ap);
6015 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
6018 /* request PM ops to EH */
6019 spin_lock_irqsave(ap->lock, flags);
6024 ap->pm_result = &rc;
6027 ap->pflags |= ATA_PFLAG_PM_PENDING;
6028 __ata_port_for_each_link(link, ap) {
6029 link->eh_info.action |= action;
6030 link->eh_info.flags |= ehi_flags;
6033 ata_port_schedule_eh(ap);
6035 spin_unlock_irqrestore(ap->lock, flags);
6037 /* wait and check result */
6039 ata_port_wait_eh(ap);
6040 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
6050 * ata_host_suspend - suspend host
6051 * @host: host to suspend
6054 * Suspend @host. Actual operation is performed by EH. This
6055 * function requests EH to perform PM operations and waits for EH
6059 * Kernel thread context (may sleep).
6062 * 0 on success, -errno on failure.
6064 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
6068 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
6070 host->dev->power.power_state = mesg;
6075 * ata_host_resume - resume host
6076 * @host: host to resume
6078 * Resume @host. Actual operation is performed by EH. This
6079 * function requests EH to perform PM operations and returns.
6080 * Note that all resume operations are performed parallely.
6083 * Kernel thread context (may sleep).
6085 void ata_host_resume(struct ata_host *host)
6087 ata_host_request_pm(host, PMSG_ON, ATA_EH_SOFTRESET,
6088 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
6089 host->dev->power.power_state = PMSG_ON;
6094 * ata_port_start - Set port up for dma.
6095 * @ap: Port to initialize
6097 * Called just after data structures for each port are
6098 * initialized. Allocates space for PRD table.
6100 * May be used as the port_start() entry in ata_port_operations.
6103 * Inherited from caller.
6105 int ata_port_start(struct ata_port *ap)
6107 struct device *dev = ap->dev;
6110 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
6115 rc = ata_pad_alloc(ap, dev);
6119 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
6120 (unsigned long long)ap->prd_dma);
6125 * ata_dev_init - Initialize an ata_device structure
6126 * @dev: Device structure to initialize
6128 * Initialize @dev in preparation for probing.
6131 * Inherited from caller.
6133 void ata_dev_init(struct ata_device *dev)
6135 struct ata_link *link = dev->link;
6136 struct ata_port *ap = link->ap;
6137 unsigned long flags;
6139 /* SATA spd limit is bound to the first device */
6140 link->sata_spd_limit = link->hw_sata_spd_limit;
6143 /* High bits of dev->flags are used to record warm plug
6144 * requests which occur asynchronously. Synchronize using
6147 spin_lock_irqsave(ap->lock, flags);
6148 dev->flags &= ~ATA_DFLAG_INIT_MASK;
6150 spin_unlock_irqrestore(ap->lock, flags);
6152 memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
6153 sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6154 dev->pio_mask = UINT_MAX;
6155 dev->mwdma_mask = UINT_MAX;
6156 dev->udma_mask = UINT_MAX;
6160 * ata_link_init - Initialize an ata_link structure
6161 * @ap: ATA port link is attached to
6162 * @link: Link structure to initialize
6163 * @pmp: Port multiplier port number
6168 * Kernel thread context (may sleep)
6170 static void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
6174 /* clear everything except for devices */
6175 memset(link, 0, offsetof(struct ata_link, device[0]));
6179 link->active_tag = ATA_TAG_POISON;
6180 link->hw_sata_spd_limit = UINT_MAX;
6182 /* can't use iterator, ap isn't initialized yet */
6183 for (i = 0; i < ATA_MAX_DEVICES; i++) {
6184 struct ata_device *dev = &link->device[i];
6187 dev->devno = dev - link->device;
6193 * sata_link_init_spd - Initialize link->sata_spd_limit
6194 * @link: Link to configure sata_spd_limit for
6196 * Initialize @link->[hw_]sata_spd_limit to the currently
6200 * Kernel thread context (may sleep).
6203 * 0 on success, -errno on failure.
6205 static int sata_link_init_spd(struct ata_link *link)
6210 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
6214 spd = (scontrol >> 4) & 0xf;
6216 link->hw_sata_spd_limit &= (1 << spd) - 1;
6218 link->sata_spd_limit = link->hw_sata_spd_limit;
6224 * ata_port_alloc - allocate and initialize basic ATA port resources
6225 * @host: ATA host this allocated port belongs to
6227 * Allocate and initialize basic ATA port resources.
6230 * Allocate ATA port on success, NULL on failure.
6233 * Inherited from calling layer (may sleep).
6235 struct ata_port *ata_port_alloc(struct ata_host *host)
6237 struct ata_port *ap;
6241 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
6245 ap->pflags |= ATA_PFLAG_INITIALIZING;
6246 ap->lock = &host->lock;
6247 ap->flags = ATA_FLAG_DISABLED;
6249 ap->ctl = ATA_DEVCTL_OBS;
6251 ap->dev = host->dev;
6252 ap->last_ctl = 0xFF;
6254 #if defined(ATA_VERBOSE_DEBUG)
6255 /* turn on all debugging levels */
6256 ap->msg_enable = 0x00FF;
6257 #elif defined(ATA_DEBUG)
6258 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
6260 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6263 INIT_DELAYED_WORK(&ap->port_task, NULL);
6264 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
6265 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
6266 INIT_LIST_HEAD(&ap->eh_done_q);
6267 init_waitqueue_head(&ap->eh_wait_q);
6268 init_timer_deferrable(&ap->fastdrain_timer);
6269 ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
6270 ap->fastdrain_timer.data = (unsigned long)ap;
6272 ap->cbl = ATA_CBL_NONE;
6274 ata_link_init(ap, &ap->link, 0);
6277 ap->stats.unhandled_irq = 1;
6278 ap->stats.idle_irq = 1;
6283 static void ata_host_release(struct device *gendev, void *res)
6285 struct ata_host *host = dev_get_drvdata(gendev);
6288 for (i = 0; i < host->n_ports; i++) {
6289 struct ata_port *ap = host->ports[i];
6294 if ((host->flags & ATA_HOST_STARTED) && ap->ops->port_stop)
6295 ap->ops->port_stop(ap);
6298 if ((host->flags & ATA_HOST_STARTED) && host->ops->host_stop)
6299 host->ops->host_stop(host);
6301 for (i = 0; i < host->n_ports; i++) {
6302 struct ata_port *ap = host->ports[i];
6308 scsi_host_put(ap->scsi_host);
6311 host->ports[i] = NULL;
6314 dev_set_drvdata(gendev, NULL);
6318 * ata_host_alloc - allocate and init basic ATA host resources
6319 * @dev: generic device this host is associated with
6320 * @max_ports: maximum number of ATA ports associated with this host
6322 * Allocate and initialize basic ATA host resources. LLD calls
6323 * this function to allocate a host, initializes it fully and
6324 * attaches it using ata_host_register().
6326 * @max_ports ports are allocated and host->n_ports is
6327 * initialized to @max_ports. The caller is allowed to decrease
6328 * host->n_ports before calling ata_host_register(). The unused
6329 * ports will be automatically freed on registration.
6332 * Allocate ATA host on success, NULL on failure.
6335 * Inherited from calling layer (may sleep).
6337 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
6339 struct ata_host *host;
6345 if (!devres_open_group(dev, NULL, GFP_KERNEL))
6348 /* alloc a container for our list of ATA ports (buses) */
6349 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
6350 /* alloc a container for our list of ATA ports (buses) */
6351 host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
6355 devres_add(dev, host);
6356 dev_set_drvdata(dev, host);
6358 spin_lock_init(&host->lock);
6360 host->n_ports = max_ports;
6362 /* allocate ports bound to this host */
6363 for (i = 0; i < max_ports; i++) {
6364 struct ata_port *ap;
6366 ap = ata_port_alloc(host);
6371 host->ports[i] = ap;
6374 devres_remove_group(dev, NULL);
6378 devres_release_group(dev, NULL);
6383 * ata_host_alloc_pinfo - alloc host and init with port_info array
6384 * @dev: generic device this host is associated with
6385 * @ppi: array of ATA port_info to initialize host with
6386 * @n_ports: number of ATA ports attached to this host
6388 * Allocate ATA host and initialize with info from @ppi. If NULL
6389 * terminated, @ppi may contain fewer entries than @n_ports. The
6390 * last entry will be used for the remaining ports.
6393 * Allocate ATA host on success, NULL on failure.
6396 * Inherited from calling layer (may sleep).
6398 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
6399 const struct ata_port_info * const * ppi,
6402 const struct ata_port_info *pi;
6403 struct ata_host *host;
6406 host = ata_host_alloc(dev, n_ports);
6410 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
6411 struct ata_port *ap = host->ports[i];
6416 ap->pio_mask = pi->pio_mask;
6417 ap->mwdma_mask = pi->mwdma_mask;
6418 ap->udma_mask = pi->udma_mask;
6419 ap->flags |= pi->flags;
6420 ap->link.flags |= pi->link_flags;
6421 ap->ops = pi->port_ops;
6423 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
6424 host->ops = pi->port_ops;
6425 if (!host->private_data && pi->private_data)
6426 host->private_data = pi->private_data;
6433 * ata_host_start - start and freeze ports of an ATA host
6434 * @host: ATA host to start ports for
6436 * Start and then freeze ports of @host. Started status is
6437 * recorded in host->flags, so this function can be called
6438 * multiple times. Ports are guaranteed to get started only
6439 * once. If host->ops isn't initialized yet, its set to the
6440 * first non-dummy port ops.
6443 * Inherited from calling layer (may sleep).
6446 * 0 if all ports are started successfully, -errno otherwise.
6448 int ata_host_start(struct ata_host *host)
6452 if (host->flags & ATA_HOST_STARTED)
6455 for (i = 0; i < host->n_ports; i++) {
6456 struct ata_port *ap = host->ports[i];
6458 if (!host->ops && !ata_port_is_dummy(ap))
6459 host->ops = ap->ops;
6461 if (ap->ops->port_start) {
6462 rc = ap->ops->port_start(ap);
6464 ata_port_printk(ap, KERN_ERR, "failed to "
6465 "start port (errno=%d)\n", rc);
6470 ata_eh_freeze_port(ap);
6473 host->flags |= ATA_HOST_STARTED;
6478 struct ata_port *ap = host->ports[i];
6480 if (ap->ops->port_stop)
6481 ap->ops->port_stop(ap);
6487 * ata_sas_host_init - Initialize a host struct
6488 * @host: host to initialize
6489 * @dev: device host is attached to
6490 * @flags: host flags
6494 * PCI/etc. bus probe sem.
6497 /* KILLME - the only user left is ipr */
6498 void ata_host_init(struct ata_host *host, struct device *dev,
6499 unsigned long flags, const struct ata_port_operations *ops)
6501 spin_lock_init(&host->lock);
6503 host->flags = flags;
6508 * ata_host_register - register initialized ATA host
6509 * @host: ATA host to register
6510 * @sht: template for SCSI host
6512 * Register initialized ATA host. @host is allocated using
6513 * ata_host_alloc() and fully initialized by LLD. This function
6514 * starts ports, registers @host with ATA and SCSI layers and
6515 * probe registered devices.
6518 * Inherited from calling layer (may sleep).
6521 * 0 on success, -errno otherwise.
6523 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
6527 /* host must have been started */
6528 if (!(host->flags & ATA_HOST_STARTED)) {
6529 dev_printk(KERN_ERR, host->dev,
6530 "BUG: trying to register unstarted host\n");
6535 /* Blow away unused ports. This happens when LLD can't
6536 * determine the exact number of ports to allocate at
6539 for (i = host->n_ports; host->ports[i]; i++)
6540 kfree(host->ports[i]);
6542 /* give ports names and add SCSI hosts */
6543 for (i = 0; i < host->n_ports; i++)
6544 host->ports[i]->print_id = ata_print_id++;
6546 rc = ata_scsi_add_hosts(host, sht);
6550 /* associate with ACPI nodes */
6551 ata_acpi_associate(host);
6553 /* set cable, sata_spd_limit and report */
6554 for (i = 0; i < host->n_ports; i++) {
6555 struct ata_port *ap = host->ports[i];
6556 unsigned long xfer_mask;
6558 /* set SATA cable type if still unset */
6559 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
6560 ap->cbl = ATA_CBL_SATA;
6562 /* init sata_spd_limit to the current value */
6563 sata_link_init_spd(&ap->link);
6565 /* print per-port info to dmesg */
6566 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
6569 if (!ata_port_is_dummy(ap))
6570 ata_port_printk(ap, KERN_INFO,
6571 "%cATA max %s %s\n",
6572 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6573 ata_mode_string(xfer_mask),
6574 ap->link.eh_info.desc);
6576 ata_port_printk(ap, KERN_INFO, "DUMMY\n");
6579 /* perform each probe synchronously */
6580 DPRINTK("probe begin\n");
6581 for (i = 0; i < host->n_ports; i++) {
6582 struct ata_port *ap = host->ports[i];
6586 if (ap->ops->error_handler) {
6587 struct ata_eh_info *ehi = &ap->link.eh_info;
6588 unsigned long flags;
6592 /* kick EH for boot probing */
6593 spin_lock_irqsave(ap->lock, flags);
6596 (1 << ata_link_max_devices(&ap->link)) - 1;
6597 ehi->action |= ATA_EH_SOFTRESET;
6598 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
6600 ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6601 ap->pflags |= ATA_PFLAG_LOADING;
6602 ata_port_schedule_eh(ap);
6604 spin_unlock_irqrestore(ap->lock, flags);
6606 /* wait for EH to finish */
6607 ata_port_wait_eh(ap);
6609 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
6610 rc = ata_bus_probe(ap);
6611 DPRINTK("ata%u: bus probe end\n", ap->print_id);
6614 /* FIXME: do something useful here?
6615 * Current libata behavior will
6616 * tear down everything when
6617 * the module is removed
6618 * or the h/w is unplugged.
6624 /* probes are done, now scan each port's disk(s) */
6625 DPRINTK("host probe begin\n");
6626 for (i = 0; i < host->n_ports; i++) {
6627 struct ata_port *ap = host->ports[i];
6629 ata_scsi_scan_host(ap, 1);
6636 * ata_host_activate - start host, request IRQ and register it
6637 * @host: target ATA host
6638 * @irq: IRQ to request
6639 * @irq_handler: irq_handler used when requesting IRQ
6640 * @irq_flags: irq_flags used when requesting IRQ
6641 * @sht: scsi_host_template to use when registering the host
6643 * After allocating an ATA host and initializing it, most libata
6644 * LLDs perform three steps to activate the host - start host,
6645 * request IRQ and register it. This helper takes necessasry
6646 * arguments and performs the three steps in one go.
6649 * Inherited from calling layer (may sleep).
6652 * 0 on success, -errno otherwise.
6654 int ata_host_activate(struct ata_host *host, int irq,
6655 irq_handler_t irq_handler, unsigned long irq_flags,
6656 struct scsi_host_template *sht)
6660 rc = ata_host_start(host);
6664 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
6665 dev_driver_string(host->dev), host);
6669 for (i = 0; i < host->n_ports; i++)
6670 ata_port_desc(host->ports[i], "irq %d", irq);
6672 rc = ata_host_register(host, sht);
6673 /* if failed, just free the IRQ and leave ports alone */
6675 devm_free_irq(host->dev, irq, host);
6681 * ata_port_detach - Detach ATA port in prepration of device removal
6682 * @ap: ATA port to be detached
6684 * Detach all ATA devices and the associated SCSI devices of @ap;
6685 * then, remove the associated SCSI host. @ap is guaranteed to
6686 * be quiescent on return from this function.
6689 * Kernel thread context (may sleep).
6691 void ata_port_detach(struct ata_port *ap)
6693 unsigned long flags;
6694 struct ata_link *link;
6695 struct ata_device *dev;
6697 if (!ap->ops->error_handler)
6700 /* tell EH we're leaving & flush EH */
6701 spin_lock_irqsave(ap->lock, flags);
6702 ap->pflags |= ATA_PFLAG_UNLOADING;
6703 spin_unlock_irqrestore(ap->lock, flags);
6705 ata_port_wait_eh(ap);
6707 /* EH is now guaranteed to see UNLOADING, so no new device
6708 * will be attached. Disable all existing devices.
6710 spin_lock_irqsave(ap->lock, flags);
6712 ata_port_for_each_link(link, ap) {
6713 ata_link_for_each_dev(dev, link)
6714 ata_dev_disable(dev);
6717 spin_unlock_irqrestore(ap->lock, flags);
6719 /* Final freeze & EH. All in-flight commands are aborted. EH
6720 * will be skipped and retrials will be terminated with bad
6723 spin_lock_irqsave(ap->lock, flags);
6724 ata_port_freeze(ap); /* won't be thawed */
6725 spin_unlock_irqrestore(ap->lock, flags);
6727 ata_port_wait_eh(ap);
6728 cancel_rearming_delayed_work(&ap->hotplug_task);
6731 /* remove the associated SCSI host */
6732 scsi_remove_host(ap->scsi_host);
6736 * ata_host_detach - Detach all ports of an ATA host
6737 * @host: Host to detach
6739 * Detach all ports of @host.
6742 * Kernel thread context (may sleep).
6744 void ata_host_detach(struct ata_host *host)
6748 for (i = 0; i < host->n_ports; i++)
6749 ata_port_detach(host->ports[i]);
6753 * ata_std_ports - initialize ioaddr with standard port offsets.
6754 * @ioaddr: IO address structure to be initialized
6756 * Utility function which initializes data_addr, error_addr,
6757 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
6758 * device_addr, status_addr, and command_addr to standard offsets
6759 * relative to cmd_addr.
6761 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
6764 void ata_std_ports(struct ata_ioports *ioaddr)
6766 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
6767 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
6768 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
6769 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
6770 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
6771 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
6772 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
6773 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
6774 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
6775 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
6782 * ata_pci_remove_one - PCI layer callback for device removal
6783 * @pdev: PCI device that was removed
6785 * PCI layer indicates to libata via this hook that hot-unplug or
6786 * module unload event has occurred. Detach all ports. Resource
6787 * release is handled via devres.
6790 * Inherited from PCI layer (may sleep).
6792 void ata_pci_remove_one(struct pci_dev *pdev)
6794 struct device *dev = pci_dev_to_dev(pdev);
6795 struct ata_host *host = dev_get_drvdata(dev);
6797 ata_host_detach(host);
6800 /* move to PCI subsystem */
6801 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
6803 unsigned long tmp = 0;
6805 switch (bits->width) {
6808 pci_read_config_byte(pdev, bits->reg, &tmp8);
6814 pci_read_config_word(pdev, bits->reg, &tmp16);
6820 pci_read_config_dword(pdev, bits->reg, &tmp32);
6831 return (tmp == bits->val) ? 1 : 0;
6835 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
6837 pci_save_state(pdev);
6838 pci_disable_device(pdev);
6840 if (mesg.event == PM_EVENT_SUSPEND)
6841 pci_set_power_state(pdev, PCI_D3hot);
6844 int ata_pci_device_do_resume(struct pci_dev *pdev)
6848 pci_set_power_state(pdev, PCI_D0);
6849 pci_restore_state(pdev);
6851 rc = pcim_enable_device(pdev);
6853 dev_printk(KERN_ERR, &pdev->dev,
6854 "failed to enable device after resume (%d)\n", rc);
6858 pci_set_master(pdev);
6862 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6864 struct ata_host *host = dev_get_drvdata(&pdev->dev);
6867 rc = ata_host_suspend(host, mesg);
6871 ata_pci_device_do_suspend(pdev, mesg);
6876 int ata_pci_device_resume(struct pci_dev *pdev)
6878 struct ata_host *host = dev_get_drvdata(&pdev->dev);
6881 rc = ata_pci_device_do_resume(pdev);
6883 ata_host_resume(host);
6886 #endif /* CONFIG_PM */
6888 #endif /* CONFIG_PCI */
6891 static int __init ata_init(void)
6893 ata_probe_timeout *= HZ;
6894 ata_wq = create_workqueue("ata");
6898 ata_aux_wq = create_singlethread_workqueue("ata_aux");
6900 destroy_workqueue(ata_wq);
6904 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
6908 static void __exit ata_exit(void)
6910 destroy_workqueue(ata_wq);
6911 destroy_workqueue(ata_aux_wq);
6914 subsys_initcall(ata_init);
6915 module_exit(ata_exit);
6917 static unsigned long ratelimit_time;
6918 static DEFINE_SPINLOCK(ata_ratelimit_lock);
6920 int ata_ratelimit(void)
6923 unsigned long flags;
6925 spin_lock_irqsave(&ata_ratelimit_lock, flags);
6927 if (time_after(jiffies, ratelimit_time)) {
6929 ratelimit_time = jiffies + (HZ/5);
6933 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
6939 * ata_wait_register - wait until register value changes
6940 * @reg: IO-mapped register
6941 * @mask: Mask to apply to read register value
6942 * @val: Wait condition
6943 * @interval_msec: polling interval in milliseconds
6944 * @timeout_msec: timeout in milliseconds
6946 * Waiting for some bits of register to change is a common
6947 * operation for ATA controllers. This function reads 32bit LE
6948 * IO-mapped register @reg and tests for the following condition.
6950 * (*@reg & mask) != val
6952 * If the condition is met, it returns; otherwise, the process is
6953 * repeated after @interval_msec until timeout.
6956 * Kernel thread context (may sleep)
6959 * The final register value.
6961 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
6962 unsigned long interval_msec,
6963 unsigned long timeout_msec)
6965 unsigned long timeout;
6968 tmp = ioread32(reg);
6970 /* Calculate timeout _after_ the first read to make sure
6971 * preceding writes reach the controller before starting to
6972 * eat away the timeout.
6974 timeout = jiffies + (timeout_msec * HZ) / 1000;
6976 while ((tmp & mask) == val && time_before(jiffies, timeout)) {
6977 msleep(interval_msec);
6978 tmp = ioread32(reg);
6987 static void ata_dummy_noret(struct ata_port *ap) { }
6988 static int ata_dummy_ret0(struct ata_port *ap) { return 0; }
6989 static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }
6991 static u8 ata_dummy_check_status(struct ata_port *ap)
6996 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
6998 return AC_ERR_SYSTEM;
7001 const struct ata_port_operations ata_dummy_port_ops = {
7002 .check_status = ata_dummy_check_status,
7003 .check_altstatus = ata_dummy_check_status,
7004 .dev_select = ata_noop_dev_select,
7005 .qc_prep = ata_noop_qc_prep,
7006 .qc_issue = ata_dummy_qc_issue,
7007 .freeze = ata_dummy_noret,
7008 .thaw = ata_dummy_noret,
7009 .error_handler = ata_dummy_noret,
7010 .post_internal_cmd = ata_dummy_qc_noret,
7011 .irq_clear = ata_dummy_noret,
7012 .port_start = ata_dummy_ret0,
7013 .port_stop = ata_dummy_noret,
7016 const struct ata_port_info ata_dummy_port_info = {
7017 .port_ops = &ata_dummy_port_ops,
7021 * libata is essentially a library of internal helper functions for
7022 * low-level ATA host controller drivers. As such, the API/ABI is
7023 * likely to change as new drivers are added and updated.
7024 * Do not depend on ABI/API stability.
7027 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
7028 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
7029 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
7030 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7031 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
7032 EXPORT_SYMBOL_GPL(ata_std_bios_param);
7033 EXPORT_SYMBOL_GPL(ata_std_ports);
7034 EXPORT_SYMBOL_GPL(ata_host_init);
7035 EXPORT_SYMBOL_GPL(ata_host_alloc);
7036 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7037 EXPORT_SYMBOL_GPL(ata_host_start);
7038 EXPORT_SYMBOL_GPL(ata_host_register);
7039 EXPORT_SYMBOL_GPL(ata_host_activate);
7040 EXPORT_SYMBOL_GPL(ata_host_detach);
7041 EXPORT_SYMBOL_GPL(ata_sg_init);
7042 EXPORT_SYMBOL_GPL(ata_sg_init_one);
7043 EXPORT_SYMBOL_GPL(ata_hsm_move);
7044 EXPORT_SYMBOL_GPL(ata_qc_complete);
7045 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
7046 EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
7047 EXPORT_SYMBOL_GPL(ata_tf_load);
7048 EXPORT_SYMBOL_GPL(ata_tf_read);
7049 EXPORT_SYMBOL_GPL(ata_noop_dev_select);
7050 EXPORT_SYMBOL_GPL(ata_std_dev_select);
7051 EXPORT_SYMBOL_GPL(sata_print_link_status);
7052 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
7053 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
7054 EXPORT_SYMBOL_GPL(ata_check_status);
7055 EXPORT_SYMBOL_GPL(ata_altstatus);
7056 EXPORT_SYMBOL_GPL(ata_exec_command);
7057 EXPORT_SYMBOL_GPL(ata_port_start);
7058 EXPORT_SYMBOL_GPL(ata_sff_port_start);
7059 EXPORT_SYMBOL_GPL(ata_interrupt);
7060 EXPORT_SYMBOL_GPL(ata_do_set_mode);
7061 EXPORT_SYMBOL_GPL(ata_data_xfer);
7062 EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
7063 EXPORT_SYMBOL_GPL(ata_qc_prep);
7064 EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
7065 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
7066 EXPORT_SYMBOL_GPL(ata_bmdma_setup);
7067 EXPORT_SYMBOL_GPL(ata_bmdma_start);
7068 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
7069 EXPORT_SYMBOL_GPL(ata_bmdma_status);
7070 EXPORT_SYMBOL_GPL(ata_bmdma_stop);
7071 EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
7072 EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
7073 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
7074 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
7075 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
7076 EXPORT_SYMBOL_GPL(ata_port_probe);
7077 EXPORT_SYMBOL_GPL(ata_dev_disable);
7078 EXPORT_SYMBOL_GPL(sata_set_spd);
7079 EXPORT_SYMBOL_GPL(sata_link_debounce);
7080 EXPORT_SYMBOL_GPL(sata_link_resume);
7081 EXPORT_SYMBOL_GPL(sata_phy_reset);
7082 EXPORT_SYMBOL_GPL(__sata_phy_reset);
7083 EXPORT_SYMBOL_GPL(ata_bus_reset);
7084 EXPORT_SYMBOL_GPL(ata_std_prereset);
7085 EXPORT_SYMBOL_GPL(ata_std_softreset);
7086 EXPORT_SYMBOL_GPL(sata_link_hardreset);
7087 EXPORT_SYMBOL_GPL(sata_std_hardreset);
7088 EXPORT_SYMBOL_GPL(ata_std_postreset);
7089 EXPORT_SYMBOL_GPL(ata_dev_classify);
7090 EXPORT_SYMBOL_GPL(ata_dev_pair);
7091 EXPORT_SYMBOL_GPL(ata_port_disable);
7092 EXPORT_SYMBOL_GPL(ata_ratelimit);
7093 EXPORT_SYMBOL_GPL(ata_wait_register);
7094 EXPORT_SYMBOL_GPL(ata_busy_sleep);
7095 EXPORT_SYMBOL_GPL(ata_wait_ready);
7096 EXPORT_SYMBOL_GPL(ata_port_queue_task);
7097 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
7098 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
7099 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7100 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7101 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
7102 EXPORT_SYMBOL_GPL(ata_host_intr);
7103 EXPORT_SYMBOL_GPL(sata_scr_valid);
7104 EXPORT_SYMBOL_GPL(sata_scr_read);
7105 EXPORT_SYMBOL_GPL(sata_scr_write);
7106 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
7107 EXPORT_SYMBOL_GPL(ata_link_online);
7108 EXPORT_SYMBOL_GPL(ata_link_offline);
7110 EXPORT_SYMBOL_GPL(ata_host_suspend);
7111 EXPORT_SYMBOL_GPL(ata_host_resume);
7112 #endif /* CONFIG_PM */
7113 EXPORT_SYMBOL_GPL(ata_id_string);
7114 EXPORT_SYMBOL_GPL(ata_id_c_string);
7115 EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
7116 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
7118 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
7119 EXPORT_SYMBOL_GPL(ata_timing_compute);
7120 EXPORT_SYMBOL_GPL(ata_timing_merge);
7123 EXPORT_SYMBOL_GPL(pci_test_config_bits);
7124 EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
7125 EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
7126 EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
7127 EXPORT_SYMBOL_GPL(ata_pci_init_one);
7128 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7130 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
7131 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
7132 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
7133 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7134 #endif /* CONFIG_PM */
7135 EXPORT_SYMBOL_GPL(ata_pci_default_filter);
7136 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
7137 #endif /* CONFIG_PCI */
7139 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
7140 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
7141 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7142 EXPORT_SYMBOL_GPL(ata_port_desc);
7144 EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
7145 #endif /* CONFIG_PCI */
7146 EXPORT_SYMBOL_GPL(ata_eng_timeout);
7147 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7148 EXPORT_SYMBOL_GPL(ata_link_abort);
7149 EXPORT_SYMBOL_GPL(ata_port_abort);
7150 EXPORT_SYMBOL_GPL(ata_port_freeze);
7151 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
7152 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7153 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
7154 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
7155 EXPORT_SYMBOL_GPL(ata_do_eh);
7156 EXPORT_SYMBOL_GPL(ata_irq_on);
7157 EXPORT_SYMBOL_GPL(ata_dev_try_classify);
7159 EXPORT_SYMBOL_GPL(ata_cable_40wire);
7160 EXPORT_SYMBOL_GPL(ata_cable_80wire);
7161 EXPORT_SYMBOL_GPL(ata_cable_unknown);
7162 EXPORT_SYMBOL_GPL(ata_cable_sata);