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 /* debounce timing parameters in msecs { interval, duration, timeout } */
63 const unsigned long sata_deb_timing_normal
[] = { 5, 100, 2000 };
64 const unsigned long sata_deb_timing_hotplug
[] = { 25, 500, 2000 };
65 const unsigned long sata_deb_timing_long
[] = { 100, 2000, 5000 };
67 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
68 u16 heads
, u16 sectors
);
69 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
);
70 static void ata_dev_xfermask(struct ata_device
*dev
);
72 static unsigned int ata_unique_id
= 1;
73 static struct workqueue_struct
*ata_wq
;
75 struct workqueue_struct
*ata_aux_wq
;
77 int atapi_enabled
= 1;
78 module_param(atapi_enabled
, int, 0444);
79 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
82 module_param(atapi_dmadir
, int, 0444);
83 MODULE_PARM_DESC(atapi_dmadir
, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
86 module_param_named(fua
, libata_fua
, int, 0444);
87 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
89 static int ata_probe_timeout
= ATA_TMOUT_INTERNAL
/ HZ
;
90 module_param(ata_probe_timeout
, int, 0444);
91 MODULE_PARM_DESC(ata_probe_timeout
, "Set ATA probing timeout (seconds)");
93 MODULE_AUTHOR("Jeff Garzik");
94 MODULE_DESCRIPTION("Library module for ATA devices");
95 MODULE_LICENSE("GPL");
96 MODULE_VERSION(DRV_VERSION
);
100 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
101 * @tf: Taskfile to convert
102 * @fis: Buffer into which data will output
103 * @pmp: Port multiplier port
105 * Converts a standard ATA taskfile to a Serial ATA
106 * FIS structure (Register - Host to Device).
109 * Inherited from caller.
112 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
114 fis
[0] = 0x27; /* Register - Host to Device FIS */
115 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
116 bit 7 indicates Command FIS */
117 fis
[2] = tf
->command
;
118 fis
[3] = tf
->feature
;
125 fis
[8] = tf
->hob_lbal
;
126 fis
[9] = tf
->hob_lbam
;
127 fis
[10] = tf
->hob_lbah
;
128 fis
[11] = tf
->hob_feature
;
131 fis
[13] = tf
->hob_nsect
;
142 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
143 * @fis: Buffer from which data will be input
144 * @tf: Taskfile to output
146 * Converts a serial ATA FIS structure to a standard ATA taskfile.
149 * Inherited from caller.
152 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
154 tf
->command
= fis
[2]; /* status */
155 tf
->feature
= fis
[3]; /* error */
162 tf
->hob_lbal
= fis
[8];
163 tf
->hob_lbam
= fis
[9];
164 tf
->hob_lbah
= fis
[10];
167 tf
->hob_nsect
= fis
[13];
170 static const u8 ata_rw_cmds
[] = {
174 ATA_CMD_READ_MULTI_EXT
,
175 ATA_CMD_WRITE_MULTI_EXT
,
179 ATA_CMD_WRITE_MULTI_FUA_EXT
,
183 ATA_CMD_PIO_READ_EXT
,
184 ATA_CMD_PIO_WRITE_EXT
,
197 ATA_CMD_WRITE_FUA_EXT
201 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
202 * @qc: command to examine and configure
204 * Examine the device configuration and tf->flags to calculate
205 * the proper read/write commands and protocol to use.
210 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
212 struct ata_taskfile
*tf
= &qc
->tf
;
213 struct ata_device
*dev
= qc
->dev
;
216 int index
, fua
, lba48
, write
;
218 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
219 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
220 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
222 if (dev
->flags
& ATA_DFLAG_PIO
) {
223 tf
->protocol
= ATA_PROT_PIO
;
224 index
= dev
->multi_count
? 0 : 8;
225 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
226 /* Unable to use DMA due to host limitation */
227 tf
->protocol
= ATA_PROT_PIO
;
228 index
= dev
->multi_count
? 0 : 8;
230 tf
->protocol
= ATA_PROT_DMA
;
234 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
243 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
244 * @pio_mask: pio_mask
245 * @mwdma_mask: mwdma_mask
246 * @udma_mask: udma_mask
248 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
249 * unsigned int xfer_mask.
257 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
258 unsigned int mwdma_mask
,
259 unsigned int udma_mask
)
261 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
262 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
263 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
267 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
268 * @xfer_mask: xfer_mask to unpack
269 * @pio_mask: resulting pio_mask
270 * @mwdma_mask: resulting mwdma_mask
271 * @udma_mask: resulting udma_mask
273 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
274 * Any NULL distination masks will be ignored.
276 static void ata_unpack_xfermask(unsigned int xfer_mask
,
277 unsigned int *pio_mask
,
278 unsigned int *mwdma_mask
,
279 unsigned int *udma_mask
)
282 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
284 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
286 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
289 static const struct ata_xfer_ent
{
293 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
294 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
295 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
300 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
301 * @xfer_mask: xfer_mask of interest
303 * Return matching XFER_* value for @xfer_mask. Only the highest
304 * bit of @xfer_mask is considered.
310 * Matching XFER_* value, 0 if no match found.
312 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
314 int highbit
= fls(xfer_mask
) - 1;
315 const struct ata_xfer_ent
*ent
;
317 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
318 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
319 return ent
->base
+ highbit
- ent
->shift
;
324 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
325 * @xfer_mode: XFER_* of interest
327 * Return matching xfer_mask for @xfer_mode.
333 * Matching xfer_mask, 0 if no match found.
335 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
337 const struct ata_xfer_ent
*ent
;
339 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
340 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
341 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
346 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
347 * @xfer_mode: XFER_* of interest
349 * Return matching xfer_shift for @xfer_mode.
355 * Matching xfer_shift, -1 if no match found.
357 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
359 const struct ata_xfer_ent
*ent
;
361 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
362 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
368 * ata_mode_string - convert xfer_mask to string
369 * @xfer_mask: mask of bits supported; only highest bit counts.
371 * Determine string which represents the highest speed
372 * (highest bit in @modemask).
378 * Constant C string representing highest speed listed in
379 * @mode_mask, or the constant C string "<n/a>".
381 static const char *ata_mode_string(unsigned int xfer_mask
)
383 static const char * const xfer_mode_str
[] = {
407 highbit
= fls(xfer_mask
) - 1;
408 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
409 return xfer_mode_str
[highbit
];
413 static const char *sata_spd_string(unsigned int spd
)
415 static const char * const spd_str
[] = {
420 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
422 return spd_str
[spd
- 1];
425 void ata_dev_disable(struct ata_device
*dev
)
427 if (ata_dev_enabled(dev
) && ata_msg_drv(dev
->ap
)) {
428 ata_dev_printk(dev
, KERN_WARNING
, "disabled\n");
434 * ata_pio_devchk - PATA device presence detection
435 * @ap: ATA channel to examine
436 * @device: Device to examine (starting at zero)
438 * This technique was originally described in
439 * Hale Landis's ATADRVR (www.ata-atapi.com), and
440 * later found its way into the ATA/ATAPI spec.
442 * Write a pattern to the ATA shadow registers,
443 * and if a device is present, it will respond by
444 * correctly storing and echoing back the
445 * ATA shadow register contents.
451 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
454 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
457 ap
->ops
->dev_select(ap
, device
);
459 outb(0x55, ioaddr
->nsect_addr
);
460 outb(0xaa, ioaddr
->lbal_addr
);
462 outb(0xaa, ioaddr
->nsect_addr
);
463 outb(0x55, ioaddr
->lbal_addr
);
465 outb(0x55, ioaddr
->nsect_addr
);
466 outb(0xaa, ioaddr
->lbal_addr
);
468 nsect
= inb(ioaddr
->nsect_addr
);
469 lbal
= inb(ioaddr
->lbal_addr
);
471 if ((nsect
== 0x55) && (lbal
== 0xaa))
472 return 1; /* we found a device */
474 return 0; /* nothing found */
478 * ata_mmio_devchk - PATA device presence detection
479 * @ap: ATA channel to examine
480 * @device: Device to examine (starting at zero)
482 * This technique was originally described in
483 * Hale Landis's ATADRVR (www.ata-atapi.com), and
484 * later found its way into the ATA/ATAPI spec.
486 * Write a pattern to the ATA shadow registers,
487 * and if a device is present, it will respond by
488 * correctly storing and echoing back the
489 * ATA shadow register contents.
495 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
498 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
501 ap
->ops
->dev_select(ap
, device
);
503 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
504 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
506 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
507 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
509 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
510 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
512 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
513 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
515 if ((nsect
== 0x55) && (lbal
== 0xaa))
516 return 1; /* we found a device */
518 return 0; /* nothing found */
522 * ata_devchk - PATA device presence detection
523 * @ap: ATA channel to examine
524 * @device: Device to examine (starting at zero)
526 * Dispatch ATA device presence detection, depending
527 * on whether we are using PIO or MMIO to talk to the
528 * ATA shadow registers.
534 static unsigned int ata_devchk(struct ata_port
*ap
,
537 if (ap
->flags
& ATA_FLAG_MMIO
)
538 return ata_mmio_devchk(ap
, device
);
539 return ata_pio_devchk(ap
, device
);
543 * ata_dev_classify - determine device type based on ATA-spec signature
544 * @tf: ATA taskfile register set for device to be identified
546 * Determine from taskfile register contents whether a device is
547 * ATA or ATAPI, as per "Signature and persistence" section
548 * of ATA/PI spec (volume 1, sect 5.14).
554 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
555 * the event of failure.
558 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
560 /* Apple's open source Darwin code hints that some devices only
561 * put a proper signature into the LBA mid/high registers,
562 * So, we only check those. It's sufficient for uniqueness.
565 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
566 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
567 DPRINTK("found ATA device by sig\n");
571 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
572 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
573 DPRINTK("found ATAPI device by sig\n");
574 return ATA_DEV_ATAPI
;
577 DPRINTK("unknown device\n");
578 return ATA_DEV_UNKNOWN
;
582 * ata_dev_try_classify - Parse returned ATA device signature
583 * @ap: ATA channel to examine
584 * @device: Device to examine (starting at zero)
585 * @r_err: Value of error register on completion
587 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
588 * an ATA/ATAPI-defined set of values is placed in the ATA
589 * shadow registers, indicating the results of device detection
592 * Select the ATA device, and read the values from the ATA shadow
593 * registers. Then parse according to the Error register value,
594 * and the spec-defined values examined by ata_dev_classify().
600 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
604 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
606 struct ata_taskfile tf
;
610 ap
->ops
->dev_select(ap
, device
);
612 memset(&tf
, 0, sizeof(tf
));
614 ap
->ops
->tf_read(ap
, &tf
);
619 /* see if device passed diags: if master then continue and warn later */
620 if (err
== 0 && device
== 0)
621 /* diagnostic fail : do nothing _YET_ */
622 ap
->device
[device
].horkage
|= ATA_HORKAGE_DIAGNOSTIC
;
625 else if ((device
== 0) && (err
== 0x81))
630 /* determine if device is ATA or ATAPI */
631 class = ata_dev_classify(&tf
);
633 if (class == ATA_DEV_UNKNOWN
)
635 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
641 * ata_id_string - Convert IDENTIFY DEVICE page into string
642 * @id: IDENTIFY DEVICE results we will examine
643 * @s: string into which data is output
644 * @ofs: offset into identify device page
645 * @len: length of string to return. must be an even number.
647 * The strings in the IDENTIFY DEVICE page are broken up into
648 * 16-bit chunks. Run through the string, and output each
649 * 8-bit chunk linearly, regardless of platform.
655 void ata_id_string(const u16
*id
, unsigned char *s
,
656 unsigned int ofs
, unsigned int len
)
675 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
676 * @id: IDENTIFY DEVICE results we will examine
677 * @s: string into which data is output
678 * @ofs: offset into identify device page
679 * @len: length of string to return. must be an odd number.
681 * This function is identical to ata_id_string except that it
682 * trims trailing spaces and terminates the resulting string with
683 * null. @len must be actual maximum length (even number) + 1.
688 void ata_id_c_string(const u16
*id
, unsigned char *s
,
689 unsigned int ofs
, unsigned int len
)
695 ata_id_string(id
, s
, ofs
, len
- 1);
697 p
= s
+ strnlen(s
, len
- 1);
698 while (p
> s
&& p
[-1] == ' ')
703 static u64
ata_id_n_sectors(const u16
*id
)
705 if (ata_id_has_lba(id
)) {
706 if (ata_id_has_lba48(id
))
707 return ata_id_u64(id
, 100);
709 return ata_id_u32(id
, 60);
711 if (ata_id_current_chs_valid(id
))
712 return ata_id_u32(id
, 57);
714 return id
[1] * id
[3] * id
[6];
719 * ata_noop_dev_select - Select device 0/1 on ATA bus
720 * @ap: ATA channel to manipulate
721 * @device: ATA device (numbered from zero) to select
723 * This function performs no actual function.
725 * May be used as the dev_select() entry in ata_port_operations.
730 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
736 * ata_std_dev_select - Select device 0/1 on ATA bus
737 * @ap: ATA channel to manipulate
738 * @device: ATA device (numbered from zero) to select
740 * Use the method defined in the ATA specification to
741 * make either device 0, or device 1, active on the
742 * ATA channel. Works with both PIO and MMIO.
744 * May be used as the dev_select() entry in ata_port_operations.
750 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
755 tmp
= ATA_DEVICE_OBS
;
757 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
759 if (ap
->flags
& ATA_FLAG_MMIO
) {
760 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
762 outb(tmp
, ap
->ioaddr
.device_addr
);
764 ata_pause(ap
); /* needed; also flushes, for mmio */
768 * ata_dev_select - Select device 0/1 on ATA bus
769 * @ap: ATA channel to manipulate
770 * @device: ATA device (numbered from zero) to select
771 * @wait: non-zero to wait for Status register BSY bit to clear
772 * @can_sleep: non-zero if context allows sleeping
774 * Use the method defined in the ATA specification to
775 * make either device 0, or device 1, active on the
778 * This is a high-level version of ata_std_dev_select(),
779 * which additionally provides the services of inserting
780 * the proper pauses and status polling, where needed.
786 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
787 unsigned int wait
, unsigned int can_sleep
)
789 if (ata_msg_probe(ap
))
790 ata_port_printk(ap
, KERN_INFO
, "ata_dev_select: ENTER, ata%u: "
791 "device %u, wait %u\n", ap
->id
, device
, wait
);
796 ap
->ops
->dev_select(ap
, device
);
799 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
806 * ata_dump_id - IDENTIFY DEVICE info debugging output
807 * @id: IDENTIFY DEVICE page to dump
809 * Dump selected 16-bit words from the given IDENTIFY DEVICE
816 static inline void ata_dump_id(const u16
*id
)
818 DPRINTK("49==0x%04x "
828 DPRINTK("80==0x%04x "
838 DPRINTK("88==0x%04x "
845 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
846 * @id: IDENTIFY data to compute xfer mask from
848 * Compute the xfermask for this device. This is not as trivial
849 * as it seems if we must consider early devices correctly.
851 * FIXME: pre IDE drive timing (do we care ?).
859 static unsigned int ata_id_xfermask(const u16
*id
)
861 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
863 /* Usual case. Word 53 indicates word 64 is valid */
864 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
865 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
869 /* If word 64 isn't valid then Word 51 high byte holds
870 * the PIO timing number for the maximum. Turn it into
873 u8 mode
= id
[ATA_ID_OLD_PIO_MODES
] & 0xFF;
874 if (mode
< 5) /* Valid PIO range */
875 pio_mask
= (2 << mode
) - 1;
879 /* But wait.. there's more. Design your standards by
880 * committee and you too can get a free iordy field to
881 * process. However its the speeds not the modes that
882 * are supported... Note drivers using the timing API
883 * will get this right anyway
887 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
889 if (ata_id_is_cfa(id
)) {
891 * Process compact flash extended modes
893 int pio
= id
[163] & 0x7;
894 int dma
= (id
[163] >> 3) & 7;
897 pio_mask
|= (1 << 5);
899 pio_mask
|= (1 << 6);
901 mwdma_mask
|= (1 << 3);
903 mwdma_mask
|= (1 << 4);
907 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
908 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
910 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
914 * ata_port_queue_task - Queue port_task
915 * @ap: The ata_port to queue port_task for
916 * @fn: workqueue function to be scheduled
917 * @data: data value to pass to workqueue function
918 * @delay: delay time for workqueue function
920 * Schedule @fn(@data) for execution after @delay jiffies using
921 * port_task. There is one port_task per port and it's the
922 * user(low level driver)'s responsibility to make sure that only
923 * one task is active at any given time.
925 * libata core layer takes care of synchronization between
926 * port_task and EH. ata_port_queue_task() may be ignored for EH
930 * Inherited from caller.
932 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
937 if (ap
->pflags
& ATA_PFLAG_FLUSH_PORT_TASK
)
940 PREPARE_WORK(&ap
->port_task
, fn
, data
);
943 rc
= queue_work(ata_wq
, &ap
->port_task
);
945 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
947 /* rc == 0 means that another user is using port task */
952 * ata_port_flush_task - Flush port_task
953 * @ap: The ata_port to flush port_task for
955 * After this function completes, port_task is guranteed not to
956 * be running or scheduled.
959 * Kernel thread context (may sleep)
961 void ata_port_flush_task(struct ata_port
*ap
)
967 spin_lock_irqsave(ap
->lock
, flags
);
968 ap
->pflags
|= ATA_PFLAG_FLUSH_PORT_TASK
;
969 spin_unlock_irqrestore(ap
->lock
, flags
);
971 DPRINTK("flush #1\n");
972 flush_workqueue(ata_wq
);
975 * At this point, if a task is running, it's guaranteed to see
976 * the FLUSH flag; thus, it will never queue pio tasks again.
979 if (!cancel_delayed_work(&ap
->port_task
)) {
981 ata_port_printk(ap
, KERN_DEBUG
, "%s: flush #2\n",
983 flush_workqueue(ata_wq
);
986 spin_lock_irqsave(ap
->lock
, flags
);
987 ap
->pflags
&= ~ATA_PFLAG_FLUSH_PORT_TASK
;
988 spin_unlock_irqrestore(ap
->lock
, flags
);
991 ata_port_printk(ap
, KERN_DEBUG
, "%s: EXIT\n", __FUNCTION__
);
994 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
996 struct completion
*waiting
= qc
->private_data
;
1002 * ata_exec_internal - execute libata internal command
1003 * @dev: Device to which the command is sent
1004 * @tf: Taskfile registers for the command and the result
1005 * @cdb: CDB for packet command
1006 * @dma_dir: Data tranfer direction of the command
1007 * @buf: Data buffer of the command
1008 * @buflen: Length of data buffer
1010 * Executes libata internal command with timeout. @tf contains
1011 * command on entry and result on return. Timeout and error
1012 * conditions are reported via return value. No recovery action
1013 * is taken after a command times out. It's caller's duty to
1014 * clean up after timeout.
1017 * None. Should be called with kernel context, might sleep.
1020 * Zero on success, AC_ERR_* mask on failure
1022 unsigned ata_exec_internal(struct ata_device
*dev
,
1023 struct ata_taskfile
*tf
, const u8
*cdb
,
1024 int dma_dir
, void *buf
, unsigned int buflen
)
1026 struct ata_port
*ap
= dev
->ap
;
1027 u8 command
= tf
->command
;
1028 struct ata_queued_cmd
*qc
;
1029 unsigned int tag
, preempted_tag
;
1030 u32 preempted_sactive
, preempted_qc_active
;
1031 DECLARE_COMPLETION_ONSTACK(wait
);
1032 unsigned long flags
;
1033 unsigned int err_mask
;
1036 spin_lock_irqsave(ap
->lock
, flags
);
1038 /* no internal command while frozen */
1039 if (ap
->pflags
& ATA_PFLAG_FROZEN
) {
1040 spin_unlock_irqrestore(ap
->lock
, flags
);
1041 return AC_ERR_SYSTEM
;
1044 /* initialize internal qc */
1046 /* XXX: Tag 0 is used for drivers with legacy EH as some
1047 * drivers choke if any other tag is given. This breaks
1048 * ata_tag_internal() test for those drivers. Don't use new
1049 * EH stuff without converting to it.
1051 if (ap
->ops
->error_handler
)
1052 tag
= ATA_TAG_INTERNAL
;
1056 if (test_and_set_bit(tag
, &ap
->qc_allocated
))
1058 qc
= __ata_qc_from_tag(ap
, tag
);
1066 preempted_tag
= ap
->active_tag
;
1067 preempted_sactive
= ap
->sactive
;
1068 preempted_qc_active
= ap
->qc_active
;
1069 ap
->active_tag
= ATA_TAG_POISON
;
1073 /* prepare & issue qc */
1076 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1077 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1078 qc
->dma_dir
= dma_dir
;
1079 if (dma_dir
!= DMA_NONE
) {
1080 ata_sg_init_one(qc
, buf
, buflen
);
1081 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1084 qc
->private_data
= &wait
;
1085 qc
->complete_fn
= ata_qc_complete_internal
;
1089 spin_unlock_irqrestore(ap
->lock
, flags
);
1091 rc
= wait_for_completion_timeout(&wait
, ata_probe_timeout
);
1093 ata_port_flush_task(ap
);
1096 spin_lock_irqsave(ap
->lock
, flags
);
1098 /* We're racing with irq here. If we lose, the
1099 * following test prevents us from completing the qc
1100 * twice. If we win, the port is frozen and will be
1101 * cleaned up by ->post_internal_cmd().
1103 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1104 qc
->err_mask
|= AC_ERR_TIMEOUT
;
1106 if (ap
->ops
->error_handler
)
1107 ata_port_freeze(ap
);
1109 ata_qc_complete(qc
);
1111 if (ata_msg_warn(ap
))
1112 ata_dev_printk(dev
, KERN_WARNING
,
1113 "qc timeout (cmd 0x%x)\n", command
);
1116 spin_unlock_irqrestore(ap
->lock
, flags
);
1119 /* do post_internal_cmd */
1120 if (ap
->ops
->post_internal_cmd
)
1121 ap
->ops
->post_internal_cmd(qc
);
1123 if (qc
->flags
& ATA_QCFLAG_FAILED
&& !qc
->err_mask
) {
1124 if (ata_msg_warn(ap
))
1125 ata_dev_printk(dev
, KERN_WARNING
,
1126 "zero err_mask for failed "
1127 "internal command, assuming AC_ERR_OTHER\n");
1128 qc
->err_mask
|= AC_ERR_OTHER
;
1132 spin_lock_irqsave(ap
->lock
, flags
);
1134 *tf
= qc
->result_tf
;
1135 err_mask
= qc
->err_mask
;
1138 ap
->active_tag
= preempted_tag
;
1139 ap
->sactive
= preempted_sactive
;
1140 ap
->qc_active
= preempted_qc_active
;
1142 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1143 * Until those drivers are fixed, we detect the condition
1144 * here, fail the command with AC_ERR_SYSTEM and reenable the
1147 * Note that this doesn't change any behavior as internal
1148 * command failure results in disabling the device in the
1149 * higher layer for LLDDs without new reset/EH callbacks.
1151 * Kill the following code as soon as those drivers are fixed.
1153 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1154 err_mask
|= AC_ERR_SYSTEM
;
1158 spin_unlock_irqrestore(ap
->lock
, flags
);
1164 * ata_do_simple_cmd - execute simple internal command
1165 * @dev: Device to which the command is sent
1166 * @cmd: Opcode to execute
1168 * Execute a 'simple' command, that only consists of the opcode
1169 * 'cmd' itself, without filling any other registers
1172 * Kernel thread context (may sleep).
1175 * Zero on success, AC_ERR_* mask on failure
1177 unsigned int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
1179 struct ata_taskfile tf
;
1181 ata_tf_init(dev
, &tf
);
1184 tf
.flags
|= ATA_TFLAG_DEVICE
;
1185 tf
.protocol
= ATA_PROT_NODATA
;
1187 return ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
1191 * ata_pio_need_iordy - check if iordy needed
1194 * Check if the current speed of the device requires IORDY. Used
1195 * by various controllers for chip configuration.
1198 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1201 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1208 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1210 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1211 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1212 /* Is the speed faster than the drive allows non IORDY ? */
1214 /* This is cycle times not frequency - watch the logic! */
1215 if (pio
> 240) /* PIO2 is 240nS per cycle */
1224 * ata_dev_read_id - Read ID data from the specified device
1225 * @dev: target device
1226 * @p_class: pointer to class of the target device (may be changed)
1227 * @post_reset: is this read ID post-reset?
1228 * @id: buffer to read IDENTIFY data into
1230 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1231 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1232 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1233 * for pre-ATA4 drives.
1236 * Kernel thread context (may sleep)
1239 * 0 on success, -errno otherwise.
1241 int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1242 int post_reset
, u16
*id
)
1244 struct ata_port
*ap
= dev
->ap
;
1245 unsigned int class = *p_class
;
1246 struct ata_taskfile tf
;
1247 unsigned int err_mask
= 0;
1251 if (ata_msg_ctl(ap
))
1252 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1253 __FUNCTION__
, ap
->id
, dev
->devno
);
1255 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1258 ata_tf_init(dev
, &tf
);
1262 tf
.command
= ATA_CMD_ID_ATA
;
1265 tf
.command
= ATA_CMD_ID_ATAPI
;
1269 reason
= "unsupported class";
1273 tf
.protocol
= ATA_PROT_PIO
;
1275 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1276 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1279 reason
= "I/O error";
1283 swap_buf_le16(id
, ATA_ID_WORDS
);
1287 reason
= "device reports illegal type";
1289 if (class == ATA_DEV_ATA
) {
1290 if (!ata_id_is_ata(id
) && !ata_id_is_cfa(id
))
1293 if (ata_id_is_ata(id
))
1297 if (post_reset
&& class == ATA_DEV_ATA
) {
1299 * The exact sequence expected by certain pre-ATA4 drives is:
1302 * INITIALIZE DEVICE PARAMETERS
1304 * Some drives were very specific about that exact sequence.
1306 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1307 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1310 reason
= "INIT_DEV_PARAMS failed";
1314 /* current CHS translation info (id[53-58]) might be
1315 * changed. reread the identify device info.
1327 if (ata_msg_warn(ap
))
1328 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1329 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1333 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1335 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1338 static void ata_dev_config_ncq(struct ata_device
*dev
,
1339 char *desc
, size_t desc_sz
)
1341 struct ata_port
*ap
= dev
->ap
;
1342 int hdepth
= 0, ddepth
= ata_id_queue_depth(dev
->id
);
1344 if (!ata_id_has_ncq(dev
->id
)) {
1348 if (ata_device_blacklisted(dev
) & ATA_HORKAGE_NONCQ
) {
1349 snprintf(desc
, desc_sz
, "NCQ (not used)");
1352 if (ap
->flags
& ATA_FLAG_NCQ
) {
1353 hdepth
= min(ap
->scsi_host
->can_queue
, ATA_MAX_QUEUE
- 1);
1354 dev
->flags
|= ATA_DFLAG_NCQ
;
1357 if (hdepth
>= ddepth
)
1358 snprintf(desc
, desc_sz
, "NCQ (depth %d)", ddepth
);
1360 snprintf(desc
, desc_sz
, "NCQ (depth %d/%d)", hdepth
, ddepth
);
1363 static void ata_set_port_max_cmd_len(struct ata_port
*ap
)
1367 if (ap
->scsi_host
) {
1368 unsigned int len
= 0;
1370 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1371 len
= max(len
, ap
->device
[i
].cdb_len
);
1373 ap
->scsi_host
->max_cmd_len
= len
;
1378 * ata_dev_configure - Configure the specified ATA/ATAPI device
1379 * @dev: Target device to configure
1380 * @print_info: Enable device info printout
1382 * Configure @dev according to @dev->id. Generic and low-level
1383 * driver specific fixups are also applied.
1386 * Kernel thread context (may sleep)
1389 * 0 on success, -errno otherwise
1391 int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1393 struct ata_port
*ap
= dev
->ap
;
1394 const u16
*id
= dev
->id
;
1395 unsigned int xfer_mask
;
1396 char revbuf
[7]; /* XYZ-99\0 */
1399 if (!ata_dev_enabled(dev
) && ata_msg_info(ap
)) {
1400 ata_dev_printk(dev
, KERN_INFO
,
1401 "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
1402 __FUNCTION__
, ap
->id
, dev
->devno
);
1406 if (ata_msg_probe(ap
))
1407 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1408 __FUNCTION__
, ap
->id
, dev
->devno
);
1410 /* print device capabilities */
1411 if (ata_msg_probe(ap
))
1412 ata_dev_printk(dev
, KERN_DEBUG
,
1413 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
1414 "85:%04x 86:%04x 87:%04x 88:%04x\n",
1416 id
[49], id
[82], id
[83], id
[84],
1417 id
[85], id
[86], id
[87], id
[88]);
1419 /* initialize to-be-configured parameters */
1420 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1421 dev
->max_sectors
= 0;
1429 * common ATA, ATAPI feature tests
1432 /* find max transfer mode; for printk only */
1433 xfer_mask
= ata_id_xfermask(id
);
1435 if (ata_msg_probe(ap
))
1438 /* ATA-specific feature tests */
1439 if (dev
->class == ATA_DEV_ATA
) {
1440 if (ata_id_is_cfa(id
)) {
1441 if (id
[162] & 1) /* CPRM may make this media unusable */
1442 ata_dev_printk(dev
, KERN_WARNING
, "ata%u: device %u supports DRM functions and may not be fully accessable.\n",
1443 ap
->id
, dev
->devno
);
1444 snprintf(revbuf
, 7, "CFA");
1447 snprintf(revbuf
, 7, "ATA-%d", ata_id_major_version(id
));
1449 dev
->n_sectors
= ata_id_n_sectors(id
);
1451 if (ata_id_has_lba(id
)) {
1452 const char *lba_desc
;
1456 dev
->flags
|= ATA_DFLAG_LBA
;
1457 if (ata_id_has_lba48(id
)) {
1458 dev
->flags
|= ATA_DFLAG_LBA48
;
1463 ata_dev_config_ncq(dev
, ncq_desc
, sizeof(ncq_desc
));
1465 /* print device info to dmesg */
1466 if (ata_msg_drv(ap
) && print_info
)
1467 ata_dev_printk(dev
, KERN_INFO
, "%s, "
1468 "max %s, %Lu sectors: %s %s\n",
1470 ata_mode_string(xfer_mask
),
1471 (unsigned long long)dev
->n_sectors
,
1472 lba_desc
, ncq_desc
);
1476 /* Default translation */
1477 dev
->cylinders
= id
[1];
1479 dev
->sectors
= id
[6];
1481 if (ata_id_current_chs_valid(id
)) {
1482 /* Current CHS translation is valid. */
1483 dev
->cylinders
= id
[54];
1484 dev
->heads
= id
[55];
1485 dev
->sectors
= id
[56];
1488 /* print device info to dmesg */
1489 if (ata_msg_drv(ap
) && print_info
)
1490 ata_dev_printk(dev
, KERN_INFO
, "%s, "
1491 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1493 ata_mode_string(xfer_mask
),
1494 (unsigned long long)dev
->n_sectors
,
1495 dev
->cylinders
, dev
->heads
,
1499 if (dev
->id
[59] & 0x100) {
1500 dev
->multi_count
= dev
->id
[59] & 0xff;
1501 if (ata_msg_drv(ap
) && print_info
)
1502 ata_dev_printk(dev
, KERN_INFO
,
1503 "ata%u: dev %u multi count %u\n",
1504 ap
->id
, dev
->devno
, dev
->multi_count
);
1510 /* ATAPI-specific feature tests */
1511 else if (dev
->class == ATA_DEV_ATAPI
) {
1512 char *cdb_intr_string
= "";
1514 rc
= atapi_cdb_len(id
);
1515 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1516 if (ata_msg_warn(ap
))
1517 ata_dev_printk(dev
, KERN_WARNING
,
1518 "unsupported CDB len\n");
1522 dev
->cdb_len
= (unsigned int) rc
;
1524 if (ata_id_cdb_intr(dev
->id
)) {
1525 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1526 cdb_intr_string
= ", CDB intr";
1529 /* print device info to dmesg */
1530 if (ata_msg_drv(ap
) && print_info
)
1531 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s%s\n",
1532 ata_mode_string(xfer_mask
),
1536 if (dev
->horkage
& ATA_HORKAGE_DIAGNOSTIC
) {
1537 /* Let the user know. We don't want to disallow opens for
1538 rescue purposes, or in case the vendor is just a blithering
1541 ata_dev_printk(dev
, KERN_WARNING
,
1542 "Drive reports diagnostics failure. This may indicate a drive\n");
1543 ata_dev_printk(dev
, KERN_WARNING
,
1544 "fault or invalid emulation. Contact drive vendor for information.\n");
1548 ata_set_port_max_cmd_len(ap
);
1550 /* limit bridge transfers to udma5, 200 sectors */
1551 if (ata_dev_knobble(dev
)) {
1552 if (ata_msg_drv(ap
) && print_info
)
1553 ata_dev_printk(dev
, KERN_INFO
,
1554 "applying bridge limits\n");
1555 dev
->udma_mask
&= ATA_UDMA5
;
1556 dev
->max_sectors
= ATA_MAX_SECTORS
;
1559 if (ap
->ops
->dev_config
)
1560 ap
->ops
->dev_config(ap
, dev
);
1562 if (ata_msg_probe(ap
))
1563 ata_dev_printk(dev
, KERN_DEBUG
, "%s: EXIT, drv_stat = 0x%x\n",
1564 __FUNCTION__
, ata_chk_status(ap
));
1568 if (ata_msg_probe(ap
))
1569 ata_dev_printk(dev
, KERN_DEBUG
,
1570 "%s: EXIT, err\n", __FUNCTION__
);
1575 * ata_bus_probe - Reset and probe ATA bus
1578 * Master ATA bus probing function. Initiates a hardware-dependent
1579 * bus reset, then attempts to identify any devices found on
1583 * PCI/etc. bus probe sem.
1586 * Zero on success, negative errno otherwise.
1589 int ata_bus_probe(struct ata_port
*ap
)
1591 unsigned int classes
[ATA_MAX_DEVICES
];
1592 int tries
[ATA_MAX_DEVICES
];
1593 int i
, rc
, down_xfermask
;
1594 struct ata_device
*dev
;
1598 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1599 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1604 /* reset and determine device classes */
1605 ap
->ops
->phy_reset(ap
);
1607 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1608 dev
= &ap
->device
[i
];
1610 if (!(ap
->flags
& ATA_FLAG_DISABLED
) &&
1611 dev
->class != ATA_DEV_UNKNOWN
)
1612 classes
[dev
->devno
] = dev
->class;
1614 classes
[dev
->devno
] = ATA_DEV_NONE
;
1616 dev
->class = ATA_DEV_UNKNOWN
;
1621 /* after the reset the device state is PIO 0 and the controller
1622 state is undefined. Record the mode */
1624 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1625 ap
->device
[i
].pio_mode
= XFER_PIO_0
;
1627 /* read IDENTIFY page and configure devices */
1628 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1629 dev
= &ap
->device
[i
];
1632 dev
->class = classes
[i
];
1634 if (!ata_dev_enabled(dev
))
1637 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1641 rc
= ata_dev_configure(dev
, 1);
1646 /* configure transfer mode */
1647 rc
= ata_set_mode(ap
, &dev
);
1653 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1654 if (ata_dev_enabled(&ap
->device
[i
]))
1657 /* no device present, disable port */
1658 ata_port_disable(ap
);
1659 ap
->ops
->port_disable(ap
);
1666 tries
[dev
->devno
] = 0;
1669 sata_down_spd_limit(ap
);
1672 tries
[dev
->devno
]--;
1673 if (down_xfermask
&&
1674 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1675 tries
[dev
->devno
] = 0;
1678 if (!tries
[dev
->devno
]) {
1679 ata_down_xfermask_limit(dev
, 1);
1680 ata_dev_disable(dev
);
1687 * ata_port_probe - Mark port as enabled
1688 * @ap: Port for which we indicate enablement
1690 * Modify @ap data structure such that the system
1691 * thinks that the entire port is enabled.
1693 * LOCKING: host lock, or some other form of
1697 void ata_port_probe(struct ata_port
*ap
)
1699 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1703 * sata_print_link_status - Print SATA link status
1704 * @ap: SATA port to printk link status about
1706 * This function prints link speed and status of a SATA link.
1711 static void sata_print_link_status(struct ata_port
*ap
)
1713 u32 sstatus
, scontrol
, tmp
;
1715 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1717 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1719 if (ata_port_online(ap
)) {
1720 tmp
= (sstatus
>> 4) & 0xf;
1721 ata_port_printk(ap
, KERN_INFO
,
1722 "SATA link up %s (SStatus %X SControl %X)\n",
1723 sata_spd_string(tmp
), sstatus
, scontrol
);
1725 ata_port_printk(ap
, KERN_INFO
,
1726 "SATA link down (SStatus %X SControl %X)\n",
1732 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1733 * @ap: SATA port associated with target SATA PHY.
1735 * This function issues commands to standard SATA Sxxx
1736 * PHY registers, to wake up the phy (and device), and
1737 * clear any reset condition.
1740 * PCI/etc. bus probe sem.
1743 void __sata_phy_reset(struct ata_port
*ap
)
1746 unsigned long timeout
= jiffies
+ (HZ
* 5);
1748 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1749 /* issue phy wake/reset */
1750 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1751 /* Couldn't find anything in SATA I/II specs, but
1752 * AHCI-1.1 10.4.2 says at least 1 ms. */
1755 /* phy wake/clear reset */
1756 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1758 /* wait for phy to become ready, if necessary */
1761 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1762 if ((sstatus
& 0xf) != 1)
1764 } while (time_before(jiffies
, timeout
));
1766 /* print link status */
1767 sata_print_link_status(ap
);
1769 /* TODO: phy layer with polling, timeouts, etc. */
1770 if (!ata_port_offline(ap
))
1773 ata_port_disable(ap
);
1775 if (ap
->flags
& ATA_FLAG_DISABLED
)
1778 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1779 ata_port_disable(ap
);
1783 ap
->cbl
= ATA_CBL_SATA
;
1787 * sata_phy_reset - Reset SATA bus.
1788 * @ap: SATA port associated with target SATA PHY.
1790 * This function resets the SATA bus, and then probes
1791 * the bus for devices.
1794 * PCI/etc. bus probe sem.
1797 void sata_phy_reset(struct ata_port
*ap
)
1799 __sata_phy_reset(ap
);
1800 if (ap
->flags
& ATA_FLAG_DISABLED
)
1806 * ata_dev_pair - return other device on cable
1809 * Obtain the other device on the same cable, or if none is
1810 * present NULL is returned
1813 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1815 struct ata_port
*ap
= adev
->ap
;
1816 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1817 if (!ata_dev_enabled(pair
))
1823 * ata_port_disable - Disable port.
1824 * @ap: Port to be disabled.
1826 * Modify @ap data structure such that the system
1827 * thinks that the entire port is disabled, and should
1828 * never attempt to probe or communicate with devices
1831 * LOCKING: host lock, or some other form of
1835 void ata_port_disable(struct ata_port
*ap
)
1837 ap
->device
[0].class = ATA_DEV_NONE
;
1838 ap
->device
[1].class = ATA_DEV_NONE
;
1839 ap
->flags
|= ATA_FLAG_DISABLED
;
1843 * sata_down_spd_limit - adjust SATA spd limit downward
1844 * @ap: Port to adjust SATA spd limit for
1846 * Adjust SATA spd limit of @ap downward. Note that this
1847 * function only adjusts the limit. The change must be applied
1848 * using sata_set_spd().
1851 * Inherited from caller.
1854 * 0 on success, negative errno on failure
1856 int sata_down_spd_limit(struct ata_port
*ap
)
1858 u32 sstatus
, spd
, mask
;
1861 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1865 mask
= ap
->sata_spd_limit
;
1868 highbit
= fls(mask
) - 1;
1869 mask
&= ~(1 << highbit
);
1871 spd
= (sstatus
>> 4) & 0xf;
1875 mask
&= (1 << spd
) - 1;
1879 ap
->sata_spd_limit
= mask
;
1881 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1882 sata_spd_string(fls(mask
)));
1887 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1891 if (ap
->sata_spd_limit
== UINT_MAX
)
1894 limit
= fls(ap
->sata_spd_limit
);
1896 spd
= (*scontrol
>> 4) & 0xf;
1897 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1899 return spd
!= limit
;
1903 * sata_set_spd_needed - is SATA spd configuration needed
1904 * @ap: Port in question
1906 * Test whether the spd limit in SControl matches
1907 * @ap->sata_spd_limit. This function is used to determine
1908 * whether hardreset is necessary to apply SATA spd
1912 * Inherited from caller.
1915 * 1 if SATA spd configuration is needed, 0 otherwise.
1917 int sata_set_spd_needed(struct ata_port
*ap
)
1921 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1924 return __sata_set_spd_needed(ap
, &scontrol
);
1928 * sata_set_spd - set SATA spd according to spd limit
1929 * @ap: Port to set SATA spd for
1931 * Set SATA spd of @ap according to sata_spd_limit.
1934 * Inherited from caller.
1937 * 0 if spd doesn't need to be changed, 1 if spd has been
1938 * changed. Negative errno if SCR registers are inaccessible.
1940 int sata_set_spd(struct ata_port
*ap
)
1945 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1948 if (!__sata_set_spd_needed(ap
, &scontrol
))
1951 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1958 * This mode timing computation functionality is ported over from
1959 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1962 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1963 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1964 * for UDMA6, which is currently supported only by Maxtor drives.
1966 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
1969 static const struct ata_timing ata_timing
[] = {
1971 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1972 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1973 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1974 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1976 { XFER_MW_DMA_4
, 25, 0, 0, 0, 55, 20, 80, 0 },
1977 { XFER_MW_DMA_3
, 25, 0, 0, 0, 65, 25, 100, 0 },
1978 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1979 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1980 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1982 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1984 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1985 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1986 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1988 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1989 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1990 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1992 { XFER_PIO_6
, 10, 55, 20, 80, 55, 20, 80, 0 },
1993 { XFER_PIO_5
, 15, 65, 25, 100, 65, 25, 100, 0 },
1994 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1995 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1997 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1998 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1999 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
2001 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
2006 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
2007 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
2009 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
2011 q
->setup
= EZ(t
->setup
* 1000, T
);
2012 q
->act8b
= EZ(t
->act8b
* 1000, T
);
2013 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
2014 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
2015 q
->active
= EZ(t
->active
* 1000, T
);
2016 q
->recover
= EZ(t
->recover
* 1000, T
);
2017 q
->cycle
= EZ(t
->cycle
* 1000, T
);
2018 q
->udma
= EZ(t
->udma
* 1000, UT
);
2021 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
2022 struct ata_timing
*m
, unsigned int what
)
2024 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
2025 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
2026 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
2027 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
2028 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
2029 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
2030 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
2031 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
2034 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
2036 const struct ata_timing
*t
;
2038 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
2039 if (t
->mode
== 0xFF)
2044 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
2045 struct ata_timing
*t
, int T
, int UT
)
2047 const struct ata_timing
*s
;
2048 struct ata_timing p
;
2054 if (!(s
= ata_timing_find_mode(speed
)))
2057 memcpy(t
, s
, sizeof(*s
));
2060 * If the drive is an EIDE drive, it can tell us it needs extended
2061 * PIO/MW_DMA cycle timing.
2064 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
2065 memset(&p
, 0, sizeof(p
));
2066 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
2067 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
2068 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
2069 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
2070 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
2072 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
2076 * Convert the timing to bus clock counts.
2079 ata_timing_quantize(t
, t
, T
, UT
);
2082 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2083 * S.M.A.R.T * and some other commands. We have to ensure that the
2084 * DMA cycle timing is slower/equal than the fastest PIO timing.
2087 if (speed
> XFER_PIO_4
) {
2088 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
2089 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
2093 * Lengthen active & recovery time so that cycle time is correct.
2096 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
2097 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
2098 t
->rec8b
= t
->cyc8b
- t
->act8b
;
2101 if (t
->active
+ t
->recover
< t
->cycle
) {
2102 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
2103 t
->recover
= t
->cycle
- t
->active
;
2110 * ata_down_xfermask_limit - adjust dev xfer masks downward
2111 * @dev: Device to adjust xfer masks
2112 * @force_pio0: Force PIO0
2114 * Adjust xfer masks of @dev downward. Note that this function
2115 * does not apply the change. Invoking ata_set_mode() afterwards
2116 * will apply the limit.
2119 * Inherited from caller.
2122 * 0 on success, negative errno on failure
2124 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
2126 unsigned long xfer_mask
;
2129 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
2134 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2135 if (xfer_mask
& ATA_MASK_UDMA
)
2136 xfer_mask
&= ~ATA_MASK_MWDMA
;
2138 highbit
= fls(xfer_mask
) - 1;
2139 xfer_mask
&= ~(1 << highbit
);
2141 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
2145 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2148 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
2149 ata_mode_string(xfer_mask
));
2157 static int ata_dev_set_mode(struct ata_device
*dev
)
2159 unsigned int err_mask
;
2162 dev
->flags
&= ~ATA_DFLAG_PIO
;
2163 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
2164 dev
->flags
|= ATA_DFLAG_PIO
;
2166 err_mask
= ata_dev_set_xfermode(dev
);
2168 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
2169 "(err_mask=0x%x)\n", err_mask
);
2173 rc
= ata_dev_revalidate(dev
, 0);
2177 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2178 dev
->xfer_shift
, (int)dev
->xfer_mode
);
2180 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
2181 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
2186 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2187 * @ap: port on which timings will be programmed
2188 * @r_failed_dev: out paramter for failed device
2190 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2191 * ata_set_mode() fails, pointer to the failing device is
2192 * returned in @r_failed_dev.
2195 * PCI/etc. bus probe sem.
2198 * 0 on success, negative errno otherwise
2200 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2202 struct ata_device
*dev
;
2203 int i
, rc
= 0, used_dma
= 0, found
= 0;
2205 /* has private set_mode? */
2206 if (ap
->ops
->set_mode
) {
2207 /* FIXME: make ->set_mode handle no device case and
2208 * return error code and failing device on failure.
2210 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2211 if (ata_dev_ready(&ap
->device
[i
])) {
2212 ap
->ops
->set_mode(ap
);
2219 /* step 1: calculate xfer_mask */
2220 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2221 unsigned int pio_mask
, dma_mask
;
2223 dev
= &ap
->device
[i
];
2225 if (!ata_dev_enabled(dev
))
2228 ata_dev_xfermask(dev
);
2230 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2231 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2232 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2233 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2242 /* step 2: always set host PIO timings */
2243 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2244 dev
= &ap
->device
[i
];
2245 if (!ata_dev_enabled(dev
))
2248 if (!dev
->pio_mode
) {
2249 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2254 dev
->xfer_mode
= dev
->pio_mode
;
2255 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2256 if (ap
->ops
->set_piomode
)
2257 ap
->ops
->set_piomode(ap
, dev
);
2260 /* step 3: set host DMA timings */
2261 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2262 dev
= &ap
->device
[i
];
2264 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2267 dev
->xfer_mode
= dev
->dma_mode
;
2268 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2269 if (ap
->ops
->set_dmamode
)
2270 ap
->ops
->set_dmamode(ap
, dev
);
2273 /* step 4: update devices' xfer mode */
2274 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2275 dev
= &ap
->device
[i
];
2277 /* don't udpate suspended devices' xfer mode */
2278 if (!ata_dev_ready(dev
))
2281 rc
= ata_dev_set_mode(dev
);
2286 /* Record simplex status. If we selected DMA then the other
2287 * host channels are not permitted to do so.
2289 if (used_dma
&& (ap
->host
->flags
& ATA_HOST_SIMPLEX
))
2290 ap
->host
->simplex_claimed
= 1;
2292 /* step5: chip specific finalisation */
2293 if (ap
->ops
->post_set_mode
)
2294 ap
->ops
->post_set_mode(ap
);
2298 *r_failed_dev
= dev
;
2303 * ata_tf_to_host - issue ATA taskfile to host controller
2304 * @ap: port to which command is being issued
2305 * @tf: ATA taskfile register set
2307 * Issues ATA taskfile register set to ATA host controller,
2308 * with proper synchronization with interrupt handler and
2312 * spin_lock_irqsave(host lock)
2315 static inline void ata_tf_to_host(struct ata_port
*ap
,
2316 const struct ata_taskfile
*tf
)
2318 ap
->ops
->tf_load(ap
, tf
);
2319 ap
->ops
->exec_command(ap
, tf
);
2323 * ata_busy_sleep - sleep until BSY clears, or timeout
2324 * @ap: port containing status register to be polled
2325 * @tmout_pat: impatience timeout
2326 * @tmout: overall timeout
2328 * Sleep until ATA Status register bit BSY clears,
2329 * or a timeout occurs.
2332 * Kernel thread context (may sleep).
2335 * 0 on success, -errno otherwise.
2337 int ata_busy_sleep(struct ata_port
*ap
,
2338 unsigned long tmout_pat
, unsigned long tmout
)
2340 unsigned long timer_start
, timeout
;
2343 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2344 timer_start
= jiffies
;
2345 timeout
= timer_start
+ tmout_pat
;
2346 while (status
!= 0xff && (status
& ATA_BUSY
) &&
2347 time_before(jiffies
, timeout
)) {
2349 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2352 if (status
!= 0xff && (status
& ATA_BUSY
))
2353 ata_port_printk(ap
, KERN_WARNING
,
2354 "port is slow to respond, please be patient "
2355 "(Status 0x%x)\n", status
);
2357 timeout
= timer_start
+ tmout
;
2358 while (status
!= 0xff && (status
& ATA_BUSY
) &&
2359 time_before(jiffies
, timeout
)) {
2361 status
= ata_chk_status(ap
);
2367 if (status
& ATA_BUSY
) {
2368 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2369 "(%lu secs, Status 0x%x)\n",
2370 tmout
/ HZ
, status
);
2377 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2379 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2380 unsigned int dev0
= devmask
& (1 << 0);
2381 unsigned int dev1
= devmask
& (1 << 1);
2382 unsigned long timeout
;
2384 /* if device 0 was found in ata_devchk, wait for its
2388 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2390 /* if device 1 was found in ata_devchk, wait for
2391 * register access, then wait for BSY to clear
2393 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2397 ap
->ops
->dev_select(ap
, 1);
2398 if (ap
->flags
& ATA_FLAG_MMIO
) {
2399 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2400 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2402 nsect
= inb(ioaddr
->nsect_addr
);
2403 lbal
= inb(ioaddr
->lbal_addr
);
2405 if ((nsect
== 1) && (lbal
== 1))
2407 if (time_after(jiffies
, timeout
)) {
2411 msleep(50); /* give drive a breather */
2414 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2416 /* is all this really necessary? */
2417 ap
->ops
->dev_select(ap
, 0);
2419 ap
->ops
->dev_select(ap
, 1);
2421 ap
->ops
->dev_select(ap
, 0);
2424 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2425 unsigned int devmask
)
2427 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2429 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2431 /* software reset. causes dev0 to be selected */
2432 if (ap
->flags
& ATA_FLAG_MMIO
) {
2433 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2434 udelay(20); /* FIXME: flush */
2435 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2436 udelay(20); /* FIXME: flush */
2437 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2439 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2441 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2443 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2446 /* spec mandates ">= 2ms" before checking status.
2447 * We wait 150ms, because that was the magic delay used for
2448 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2449 * between when the ATA command register is written, and then
2450 * status is checked. Because waiting for "a while" before
2451 * checking status is fine, post SRST, we perform this magic
2452 * delay here as well.
2454 * Old drivers/ide uses the 2mS rule and then waits for ready
2458 /* Before we perform post reset processing we want to see if
2459 * the bus shows 0xFF because the odd clown forgets the D7
2460 * pulldown resistor.
2462 if (ata_check_status(ap
) == 0xFF)
2465 ata_bus_post_reset(ap
, devmask
);
2471 * ata_bus_reset - reset host port and associated ATA channel
2472 * @ap: port to reset
2474 * This is typically the first time we actually start issuing
2475 * commands to the ATA channel. We wait for BSY to clear, then
2476 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2477 * result. Determine what devices, if any, are on the channel
2478 * by looking at the device 0/1 error register. Look at the signature
2479 * stored in each device's taskfile registers, to determine if
2480 * the device is ATA or ATAPI.
2483 * PCI/etc. bus probe sem.
2484 * Obtains host lock.
2487 * Sets ATA_FLAG_DISABLED if bus reset fails.
2490 void ata_bus_reset(struct ata_port
*ap
)
2492 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2493 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2495 unsigned int dev0
, dev1
= 0, devmask
= 0;
2497 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2499 /* determine if device 0/1 are present */
2500 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2503 dev0
= ata_devchk(ap
, 0);
2505 dev1
= ata_devchk(ap
, 1);
2509 devmask
|= (1 << 0);
2511 devmask
|= (1 << 1);
2513 /* select device 0 again */
2514 ap
->ops
->dev_select(ap
, 0);
2516 /* issue bus reset */
2517 if (ap
->flags
& ATA_FLAG_SRST
)
2518 if (ata_bus_softreset(ap
, devmask
))
2522 * determine by signature whether we have ATA or ATAPI devices
2524 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2525 if ((slave_possible
) && (err
!= 0x81))
2526 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2528 /* re-enable interrupts */
2529 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2532 /* is double-select really necessary? */
2533 if (ap
->device
[1].class != ATA_DEV_NONE
)
2534 ap
->ops
->dev_select(ap
, 1);
2535 if (ap
->device
[0].class != ATA_DEV_NONE
)
2536 ap
->ops
->dev_select(ap
, 0);
2538 /* if no devices were detected, disable this port */
2539 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2540 (ap
->device
[1].class == ATA_DEV_NONE
))
2543 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2544 /* set up device control for ATA_FLAG_SATA_RESET */
2545 if (ap
->flags
& ATA_FLAG_MMIO
)
2546 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2548 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2555 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2556 ap
->ops
->port_disable(ap
);
2562 * sata_phy_debounce - debounce SATA phy status
2563 * @ap: ATA port to debounce SATA phy status for
2564 * @params: timing parameters { interval, duratinon, timeout } in msec
2566 * Make sure SStatus of @ap reaches stable state, determined by
2567 * holding the same value where DET is not 1 for @duration polled
2568 * every @interval, before @timeout. Timeout constraints the
2569 * beginning of the stable state. Because, after hot unplugging,
2570 * DET gets stuck at 1 on some controllers, this functions waits
2571 * until timeout then returns 0 if DET is stable at 1.
2574 * Kernel thread context (may sleep)
2577 * 0 on success, -errno on failure.
2579 int sata_phy_debounce(struct ata_port
*ap
, const unsigned long *params
)
2581 unsigned long interval_msec
= params
[0];
2582 unsigned long duration
= params
[1] * HZ
/ 1000;
2583 unsigned long timeout
= jiffies
+ params
[2] * HZ
/ 1000;
2584 unsigned long last_jiffies
;
2588 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2593 last_jiffies
= jiffies
;
2596 msleep(interval_msec
);
2597 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2603 if (cur
== 1 && time_before(jiffies
, timeout
))
2605 if (time_after(jiffies
, last_jiffies
+ duration
))
2610 /* unstable, start over */
2612 last_jiffies
= jiffies
;
2615 if (time_after(jiffies
, timeout
))
2621 * sata_phy_resume - resume SATA phy
2622 * @ap: ATA port to resume SATA phy for
2623 * @params: timing parameters { interval, duratinon, timeout } in msec
2625 * Resume SATA phy of @ap and debounce it.
2628 * Kernel thread context (may sleep)
2631 * 0 on success, -errno on failure.
2633 int sata_phy_resume(struct ata_port
*ap
, const unsigned long *params
)
2638 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2641 scontrol
= (scontrol
& 0x0f0) | 0x300;
2643 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2646 /* Some PHYs react badly if SStatus is pounded immediately
2647 * after resuming. Delay 200ms before debouncing.
2651 return sata_phy_debounce(ap
, params
);
2654 static void ata_wait_spinup(struct ata_port
*ap
)
2656 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2657 unsigned long end
, secs
;
2660 /* first, debounce phy if SATA */
2661 if (ap
->cbl
== ATA_CBL_SATA
) {
2662 rc
= sata_phy_debounce(ap
, sata_deb_timing_hotplug
);
2664 /* if debounced successfully and offline, no need to wait */
2665 if ((rc
== 0 || rc
== -EOPNOTSUPP
) && ata_port_offline(ap
))
2669 /* okay, let's give the drive time to spin up */
2670 end
= ehc
->i
.hotplug_timestamp
+ ATA_SPINUP_WAIT
* HZ
/ 1000;
2671 secs
= ((end
- jiffies
) + HZ
- 1) / HZ
;
2673 if (time_after(jiffies
, end
))
2677 ata_port_printk(ap
, KERN_INFO
, "waiting for device to spin up "
2678 "(%lu secs)\n", secs
);
2680 schedule_timeout_uninterruptible(end
- jiffies
);
2684 * ata_std_prereset - prepare for reset
2685 * @ap: ATA port to be reset
2687 * @ap is about to be reset. Initialize it.
2690 * Kernel thread context (may sleep)
2693 * 0 on success, -errno otherwise.
2695 int ata_std_prereset(struct ata_port
*ap
)
2697 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2698 const unsigned long *timing
= sata_ehc_deb_timing(ehc
);
2701 /* handle link resume & hotplug spinup */
2702 if ((ehc
->i
.flags
& ATA_EHI_RESUME_LINK
) &&
2703 (ap
->flags
& ATA_FLAG_HRST_TO_RESUME
))
2704 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2706 if ((ehc
->i
.flags
& ATA_EHI_HOTPLUGGED
) &&
2707 (ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
))
2708 ata_wait_spinup(ap
);
2710 /* if we're about to do hardreset, nothing more to do */
2711 if (ehc
->i
.action
& ATA_EH_HARDRESET
)
2714 /* if SATA, resume phy */
2715 if (ap
->cbl
== ATA_CBL_SATA
) {
2716 rc
= sata_phy_resume(ap
, timing
);
2717 if (rc
&& rc
!= -EOPNOTSUPP
) {
2718 /* phy resume failed */
2719 ata_port_printk(ap
, KERN_WARNING
, "failed to resume "
2720 "link for reset (errno=%d)\n", rc
);
2725 /* Wait for !BSY if the controller can wait for the first D2H
2726 * Reg FIS and we don't know that no device is attached.
2728 if (!(ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
) && !ata_port_offline(ap
))
2729 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2735 * ata_std_softreset - reset host port via ATA SRST
2736 * @ap: port to reset
2737 * @classes: resulting classes of attached devices
2739 * Reset host port using ATA SRST.
2742 * Kernel thread context (may sleep)
2745 * 0 on success, -errno otherwise.
2747 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2749 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2750 unsigned int devmask
= 0, err_mask
;
2755 if (ata_port_offline(ap
)) {
2756 classes
[0] = ATA_DEV_NONE
;
2760 /* determine if device 0/1 are present */
2761 if (ata_devchk(ap
, 0))
2762 devmask
|= (1 << 0);
2763 if (slave_possible
&& ata_devchk(ap
, 1))
2764 devmask
|= (1 << 1);
2766 /* select device 0 again */
2767 ap
->ops
->dev_select(ap
, 0);
2769 /* issue bus reset */
2770 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2771 err_mask
= ata_bus_softreset(ap
, devmask
);
2773 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2778 /* determine by signature whether we have ATA or ATAPI devices */
2779 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2780 if (slave_possible
&& err
!= 0x81)
2781 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2784 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2789 * sata_std_hardreset - reset host port via SATA phy reset
2790 * @ap: port to reset
2791 * @class: resulting class of attached device
2793 * SATA phy-reset host port using DET bits of SControl register.
2796 * Kernel thread context (may sleep)
2799 * 0 on success, -errno otherwise.
2801 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2803 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2804 const unsigned long *timing
= sata_ehc_deb_timing(ehc
);
2810 if (sata_set_spd_needed(ap
)) {
2811 /* SATA spec says nothing about how to reconfigure
2812 * spd. To be on the safe side, turn off phy during
2813 * reconfiguration. This works for at least ICH7 AHCI
2816 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2819 scontrol
= (scontrol
& 0x0f0) | 0x304;
2821 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2827 /* issue phy wake/reset */
2828 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2831 scontrol
= (scontrol
& 0x0f0) | 0x301;
2833 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2836 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2837 * 10.4.2 says at least 1 ms.
2841 /* bring phy back */
2842 sata_phy_resume(ap
, timing
);
2844 /* TODO: phy layer with polling, timeouts, etc. */
2845 if (ata_port_offline(ap
)) {
2846 *class = ATA_DEV_NONE
;
2847 DPRINTK("EXIT, link offline\n");
2851 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2852 ata_port_printk(ap
, KERN_ERR
,
2853 "COMRESET failed (device not ready)\n");
2857 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2859 *class = ata_dev_try_classify(ap
, 0, NULL
);
2861 DPRINTK("EXIT, class=%u\n", *class);
2866 * ata_std_postreset - standard postreset callback
2867 * @ap: the target ata_port
2868 * @classes: classes of attached devices
2870 * This function is invoked after a successful reset. Note that
2871 * the device might have been reset more than once using
2872 * different reset methods before postreset is invoked.
2875 * Kernel thread context (may sleep)
2877 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2883 /* print link status */
2884 sata_print_link_status(ap
);
2887 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2888 sata_scr_write(ap
, SCR_ERROR
, serror
);
2890 /* re-enable interrupts */
2891 if (!ap
->ops
->error_handler
) {
2892 /* FIXME: hack. create a hook instead */
2893 if (ap
->ioaddr
.ctl_addr
)
2897 /* is double-select really necessary? */
2898 if (classes
[0] != ATA_DEV_NONE
)
2899 ap
->ops
->dev_select(ap
, 1);
2900 if (classes
[1] != ATA_DEV_NONE
)
2901 ap
->ops
->dev_select(ap
, 0);
2903 /* bail out if no device is present */
2904 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2905 DPRINTK("EXIT, no device\n");
2909 /* set up device control */
2910 if (ap
->ioaddr
.ctl_addr
) {
2911 if (ap
->flags
& ATA_FLAG_MMIO
)
2912 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2914 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2921 * ata_dev_same_device - Determine whether new ID matches configured device
2922 * @dev: device to compare against
2923 * @new_class: class of the new device
2924 * @new_id: IDENTIFY page of the new device
2926 * Compare @new_class and @new_id against @dev and determine
2927 * whether @dev is the device indicated by @new_class and
2934 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2936 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2939 const u16
*old_id
= dev
->id
;
2940 unsigned char model
[2][41], serial
[2][21];
2943 if (dev
->class != new_class
) {
2944 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2945 dev
->class, new_class
);
2949 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2950 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2951 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2952 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2953 new_n_sectors
= ata_id_n_sectors(new_id
);
2955 if (strcmp(model
[0], model
[1])) {
2956 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2957 "'%s' != '%s'\n", model
[0], model
[1]);
2961 if (strcmp(serial
[0], serial
[1])) {
2962 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2963 "'%s' != '%s'\n", serial
[0], serial
[1]);
2967 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2968 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2970 (unsigned long long)dev
->n_sectors
,
2971 (unsigned long long)new_n_sectors
);
2979 * ata_dev_revalidate - Revalidate ATA device
2980 * @dev: device to revalidate
2981 * @post_reset: is this revalidation after reset?
2983 * Re-read IDENTIFY page and make sure @dev is still attached to
2987 * Kernel thread context (may sleep)
2990 * 0 on success, negative errno otherwise
2992 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2994 unsigned int class = dev
->class;
2995 u16
*id
= (void *)dev
->ap
->sector_buf
;
2998 if (!ata_dev_enabled(dev
)) {
3004 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
3008 /* is the device still there? */
3009 if (!ata_dev_same_device(dev
, class, id
)) {
3014 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
3016 /* configure device according to the new ID */
3017 rc
= ata_dev_configure(dev
, 0);
3022 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
3026 struct ata_blacklist_entry
{
3027 const char *model_num
;
3028 const char *model_rev
;
3029 unsigned long horkage
;
3032 static const struct ata_blacklist_entry ata_device_blacklist
[] = {
3033 /* Devices with DMA related problems under Linux */
3034 { "WDC AC11000H", NULL
, ATA_HORKAGE_NODMA
},
3035 { "WDC AC22100H", NULL
, ATA_HORKAGE_NODMA
},
3036 { "WDC AC32500H", NULL
, ATA_HORKAGE_NODMA
},
3037 { "WDC AC33100H", NULL
, ATA_HORKAGE_NODMA
},
3038 { "WDC AC31600H", NULL
, ATA_HORKAGE_NODMA
},
3039 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA
},
3040 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA
},
3041 { "Compaq CRD-8241B", NULL
, ATA_HORKAGE_NODMA
},
3042 { "CRD-8400B", NULL
, ATA_HORKAGE_NODMA
},
3043 { "CRD-8480B", NULL
, ATA_HORKAGE_NODMA
},
3044 { "CRD-8482B", NULL
, ATA_HORKAGE_NODMA
},
3045 { "CRD-84", NULL
, ATA_HORKAGE_NODMA
},
3046 { "SanDisk SDP3B", NULL
, ATA_HORKAGE_NODMA
},
3047 { "SanDisk SDP3B-64", NULL
, ATA_HORKAGE_NODMA
},
3048 { "SANYO CD-ROM CRD", NULL
, ATA_HORKAGE_NODMA
},
3049 { "HITACHI CDR-8", NULL
, ATA_HORKAGE_NODMA
},
3050 { "HITACHI CDR-8335", NULL
, ATA_HORKAGE_NODMA
},
3051 { "HITACHI CDR-8435", NULL
, ATA_HORKAGE_NODMA
},
3052 { "Toshiba CD-ROM XM-6202B", NULL
, ATA_HORKAGE_NODMA
},
3053 { "TOSHIBA CD-ROM XM-1702BC", NULL
, ATA_HORKAGE_NODMA
},
3054 { "CD-532E-A", NULL
, ATA_HORKAGE_NODMA
},
3055 { "E-IDE CD-ROM CR-840",NULL
, ATA_HORKAGE_NODMA
},
3056 { "CD-ROM Drive/F5A", NULL
, ATA_HORKAGE_NODMA
},
3057 { "WPI CDD-820", NULL
, ATA_HORKAGE_NODMA
},
3058 { "SAMSUNG CD-ROM SC-148C", NULL
, ATA_HORKAGE_NODMA
},
3059 { "SAMSUNG CD-ROM SC", NULL
, ATA_HORKAGE_NODMA
},
3060 { "SanDisk SDP3B-64", NULL
, ATA_HORKAGE_NODMA
},
3061 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,ATA_HORKAGE_NODMA
},
3062 { "_NEC DV5800A", NULL
, ATA_HORKAGE_NODMA
},
3063 { "SAMSUNG CD-ROM SN-124","N001", ATA_HORKAGE_NODMA
},
3065 /* Devices we expect to fail diagnostics */
3067 /* Devices where NCQ should be avoided */
3069 { "WDC WD740ADFD-00", NULL
, ATA_HORKAGE_NONCQ
},
3071 /* Devices with NCQ limits */
3077 static int ata_strim(char *s
, size_t len
)
3079 len
= strnlen(s
, len
);
3081 /* ATAPI specifies that empty space is blank-filled; remove blanks */
3082 while ((len
> 0) && (s
[len
- 1] == ' ')) {
3089 unsigned long ata_device_blacklisted(const struct ata_device
*dev
)
3091 unsigned char model_num
[40];
3092 unsigned char model_rev
[16];
3093 unsigned int nlen
, rlen
;
3094 const struct ata_blacklist_entry
*ad
= ata_device_blacklist
;
3096 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
3098 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
3100 nlen
= ata_strim(model_num
, sizeof(model_num
));
3101 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
3103 while (ad
->model_num
) {
3104 if (!strncmp(ad
->model_num
, model_num
, nlen
)) {
3105 if (ad
->model_rev
== NULL
)
3107 if (!strncmp(ad
->model_rev
, model_rev
, rlen
))
3115 static int ata_dma_blacklisted(const struct ata_device
*dev
)
3117 /* We don't support polling DMA.
3118 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
3119 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
3121 if ((dev
->ap
->flags
& ATA_FLAG_PIO_POLLING
) &&
3122 (dev
->flags
& ATA_DFLAG_CDB_INTR
))
3124 return (ata_device_blacklisted(dev
) & ATA_HORKAGE_NODMA
) ? 1 : 0;
3128 * ata_dev_xfermask - Compute supported xfermask of the given device
3129 * @dev: Device to compute xfermask for
3131 * Compute supported xfermask of @dev and store it in
3132 * dev->*_mask. This function is responsible for applying all
3133 * known limits including host controller limits, device
3139 static void ata_dev_xfermask(struct ata_device
*dev
)
3141 struct ata_port
*ap
= dev
->ap
;
3142 struct ata_host
*host
= ap
->host
;
3143 unsigned long xfer_mask
;
3145 /* controller modes available */
3146 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
3147 ap
->mwdma_mask
, ap
->udma_mask
);
3149 /* Apply cable rule here. Don't apply it early because when
3150 * we handle hot plug the cable type can itself change.
3152 if (ap
->cbl
== ATA_CBL_PATA40
)
3153 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
3154 /* Apply drive side cable rule. Unknown or 80 pin cables reported
3155 * host side are checked drive side as well. Cases where we know a
3156 * 40wire cable is used safely for 80 are not checked here.
3158 if (ata_drive_40wire(dev
->id
) && (ap
->cbl
== ATA_CBL_PATA_UNK
|| ap
->cbl
== ATA_CBL_PATA80
))
3159 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
3162 xfer_mask
&= ata_pack_xfermask(dev
->pio_mask
,
3163 dev
->mwdma_mask
, dev
->udma_mask
);
3164 xfer_mask
&= ata_id_xfermask(dev
->id
);
3167 * CFA Advanced TrueIDE timings are not allowed on a shared
3170 if (ata_dev_pair(dev
)) {
3171 /* No PIO5 or PIO6 */
3172 xfer_mask
&= ~(0x03 << (ATA_SHIFT_PIO
+ 5));
3173 /* No MWDMA3 or MWDMA 4 */
3174 xfer_mask
&= ~(0x03 << (ATA_SHIFT_MWDMA
+ 3));
3177 if (ata_dma_blacklisted(dev
)) {
3178 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3179 ata_dev_printk(dev
, KERN_WARNING
,
3180 "device is on DMA blacklist, disabling DMA\n");
3183 if ((host
->flags
& ATA_HOST_SIMPLEX
) && host
->simplex_claimed
) {
3184 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3185 ata_dev_printk(dev
, KERN_WARNING
, "simplex DMA is claimed by "
3186 "other device, disabling DMA\n");
3189 if (ap
->ops
->mode_filter
)
3190 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
3192 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
3193 &dev
->mwdma_mask
, &dev
->udma_mask
);
3197 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3198 * @dev: Device to which command will be sent
3200 * Issue SET FEATURES - XFER MODE command to device @dev
3204 * PCI/etc. bus probe sem.
3207 * 0 on success, AC_ERR_* mask otherwise.
3210 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3212 struct ata_taskfile tf
;
3213 unsigned int err_mask
;
3215 /* set up set-features taskfile */
3216 DPRINTK("set features - xfer mode\n");
3218 ata_tf_init(dev
, &tf
);
3219 tf
.command
= ATA_CMD_SET_FEATURES
;
3220 tf
.feature
= SETFEATURES_XFER
;
3221 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3222 tf
.protocol
= ATA_PROT_NODATA
;
3223 tf
.nsect
= dev
->xfer_mode
;
3225 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3227 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3232 * ata_dev_init_params - Issue INIT DEV PARAMS command
3233 * @dev: Device to which command will be sent
3234 * @heads: Number of heads (taskfile parameter)
3235 * @sectors: Number of sectors (taskfile parameter)
3238 * Kernel thread context (may sleep)
3241 * 0 on success, AC_ERR_* mask otherwise.
3243 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3244 u16 heads
, u16 sectors
)
3246 struct ata_taskfile tf
;
3247 unsigned int err_mask
;
3249 /* Number of sectors per track 1-255. Number of heads 1-16 */
3250 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3251 return AC_ERR_INVALID
;
3253 /* set up init dev params taskfile */
3254 DPRINTK("init dev params \n");
3256 ata_tf_init(dev
, &tf
);
3257 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3258 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3259 tf
.protocol
= ATA_PROT_NODATA
;
3261 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3263 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3265 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3270 * ata_sg_clean - Unmap DMA memory associated with command
3271 * @qc: Command containing DMA memory to be released
3273 * Unmap all mapped DMA memory associated with this command.
3276 * spin_lock_irqsave(host lock)
3279 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3281 struct ata_port
*ap
= qc
->ap
;
3282 struct scatterlist
*sg
= qc
->__sg
;
3283 int dir
= qc
->dma_dir
;
3284 void *pad_buf
= NULL
;
3286 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3287 WARN_ON(sg
== NULL
);
3289 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3290 WARN_ON(qc
->n_elem
> 1);
3292 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3294 /* if we padded the buffer out to 32-bit bound, and data
3295 * xfer direction is from-device, we must copy from the
3296 * pad buffer back into the supplied buffer
3298 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3299 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3301 if (qc
->flags
& ATA_QCFLAG_SG
) {
3303 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3304 /* restore last sg */
3305 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3307 struct scatterlist
*psg
= &qc
->pad_sgent
;
3308 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3309 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3310 kunmap_atomic(addr
, KM_IRQ0
);
3314 dma_unmap_single(ap
->dev
,
3315 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3318 sg
->length
+= qc
->pad_len
;
3320 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3321 pad_buf
, qc
->pad_len
);
3324 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3329 * ata_fill_sg - Fill PCI IDE PRD table
3330 * @qc: Metadata associated with taskfile to be transferred
3332 * Fill PCI IDE PRD (scatter-gather) table with segments
3333 * associated with the current disk command.
3336 * spin_lock_irqsave(host lock)
3339 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3341 struct ata_port
*ap
= qc
->ap
;
3342 struct scatterlist
*sg
;
3345 WARN_ON(qc
->__sg
== NULL
);
3346 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3349 ata_for_each_sg(sg
, qc
) {
3353 /* determine if physical DMA addr spans 64K boundary.
3354 * Note h/w doesn't support 64-bit, so we unconditionally
3355 * truncate dma_addr_t to u32.
3357 addr
= (u32
) sg_dma_address(sg
);
3358 sg_len
= sg_dma_len(sg
);
3361 offset
= addr
& 0xffff;
3363 if ((offset
+ sg_len
) > 0x10000)
3364 len
= 0x10000 - offset
;
3366 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3367 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3368 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3377 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3380 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3381 * @qc: Metadata associated with taskfile to check
3383 * Allow low-level driver to filter ATA PACKET commands, returning
3384 * a status indicating whether or not it is OK to use DMA for the
3385 * supplied PACKET command.
3388 * spin_lock_irqsave(host lock)
3390 * RETURNS: 0 when ATAPI DMA can be used
3393 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3395 struct ata_port
*ap
= qc
->ap
;
3396 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3398 if (ap
->ops
->check_atapi_dma
)
3399 rc
= ap
->ops
->check_atapi_dma(qc
);
3404 * ata_qc_prep - Prepare taskfile for submission
3405 * @qc: Metadata associated with taskfile to be prepared
3407 * Prepare ATA taskfile for submission.
3410 * spin_lock_irqsave(host lock)
3412 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3414 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3420 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3423 * ata_sg_init_one - Associate command with memory buffer
3424 * @qc: Command to be associated
3425 * @buf: Memory buffer
3426 * @buflen: Length of memory buffer, in bytes.
3428 * Initialize the data-related elements of queued_cmd @qc
3429 * to point to a single memory buffer, @buf of byte length @buflen.
3432 * spin_lock_irqsave(host lock)
3435 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3437 struct scatterlist
*sg
;
3439 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3441 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3442 qc
->__sg
= &qc
->sgent
;
3444 qc
->orig_n_elem
= 1;
3446 qc
->nbytes
= buflen
;
3449 sg_init_one(sg
, buf
, buflen
);
3453 * ata_sg_init - Associate command with scatter-gather table.
3454 * @qc: Command to be associated
3455 * @sg: Scatter-gather table.
3456 * @n_elem: Number of elements in s/g table.
3458 * Initialize the data-related elements of queued_cmd @qc
3459 * to point to a scatter-gather table @sg, containing @n_elem
3463 * spin_lock_irqsave(host lock)
3466 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3467 unsigned int n_elem
)
3469 qc
->flags
|= ATA_QCFLAG_SG
;
3471 qc
->n_elem
= n_elem
;
3472 qc
->orig_n_elem
= n_elem
;
3476 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3477 * @qc: Command with memory buffer to be mapped.
3479 * DMA-map the memory buffer associated with queued_cmd @qc.
3482 * spin_lock_irqsave(host lock)
3485 * Zero on success, negative on error.
3488 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3490 struct ata_port
*ap
= qc
->ap
;
3491 int dir
= qc
->dma_dir
;
3492 struct scatterlist
*sg
= qc
->__sg
;
3493 dma_addr_t dma_address
;
3496 /* we must lengthen transfers to end on a 32-bit boundary */
3497 qc
->pad_len
= sg
->length
& 3;
3499 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3500 struct scatterlist
*psg
= &qc
->pad_sgent
;
3502 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3504 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3506 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3507 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3510 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3511 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3513 sg
->length
-= qc
->pad_len
;
3514 if (sg
->length
== 0)
3517 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3518 sg
->length
, qc
->pad_len
);
3526 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3528 if (dma_mapping_error(dma_address
)) {
3530 sg
->length
+= qc
->pad_len
;
3534 sg_dma_address(sg
) = dma_address
;
3535 sg_dma_len(sg
) = sg
->length
;
3538 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3539 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3545 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3546 * @qc: Command with scatter-gather table to be mapped.
3548 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3551 * spin_lock_irqsave(host lock)
3554 * Zero on success, negative on error.
3558 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3560 struct ata_port
*ap
= qc
->ap
;
3561 struct scatterlist
*sg
= qc
->__sg
;
3562 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3563 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3565 VPRINTK("ENTER, ata%u\n", ap
->id
);
3566 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3568 /* we must lengthen transfers to end on a 32-bit boundary */
3569 qc
->pad_len
= lsg
->length
& 3;
3571 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3572 struct scatterlist
*psg
= &qc
->pad_sgent
;
3573 unsigned int offset
;
3575 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3577 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3580 * psg->page/offset are used to copy to-be-written
3581 * data in this function or read data in ata_sg_clean.
3583 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3584 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3585 psg
->offset
= offset_in_page(offset
);
3587 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3588 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3589 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3590 kunmap_atomic(addr
, KM_IRQ0
);
3593 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3594 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3596 lsg
->length
-= qc
->pad_len
;
3597 if (lsg
->length
== 0)
3600 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3601 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3604 pre_n_elem
= qc
->n_elem
;
3605 if (trim_sg
&& pre_n_elem
)
3614 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3616 /* restore last sg */
3617 lsg
->length
+= qc
->pad_len
;
3621 DPRINTK("%d sg elements mapped\n", n_elem
);
3624 qc
->n_elem
= n_elem
;
3630 * swap_buf_le16 - swap halves of 16-bit words in place
3631 * @buf: Buffer to swap
3632 * @buf_words: Number of 16-bit words in buffer.
3634 * Swap halves of 16-bit words if needed to convert from
3635 * little-endian byte order to native cpu byte order, or
3639 * Inherited from caller.
3641 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3646 for (i
= 0; i
< buf_words
; i
++)
3647 buf
[i
] = le16_to_cpu(buf
[i
]);
3648 #endif /* __BIG_ENDIAN */
3652 * ata_mmio_data_xfer - Transfer data by MMIO
3653 * @adev: device for this I/O
3655 * @buflen: buffer length
3656 * @write_data: read/write
3658 * Transfer data from/to the device data register by MMIO.
3661 * Inherited from caller.
3664 void ata_mmio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3665 unsigned int buflen
, int write_data
)
3667 struct ata_port
*ap
= adev
->ap
;
3669 unsigned int words
= buflen
>> 1;
3670 u16
*buf16
= (u16
*) buf
;
3671 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3673 /* Transfer multiple of 2 bytes */
3675 for (i
= 0; i
< words
; i
++)
3676 writew(le16_to_cpu(buf16
[i
]), mmio
);
3678 for (i
= 0; i
< words
; i
++)
3679 buf16
[i
] = cpu_to_le16(readw(mmio
));
3682 /* Transfer trailing 1 byte, if any. */
3683 if (unlikely(buflen
& 0x01)) {
3684 u16 align_buf
[1] = { 0 };
3685 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3688 memcpy(align_buf
, trailing_buf
, 1);
3689 writew(le16_to_cpu(align_buf
[0]), mmio
);
3691 align_buf
[0] = cpu_to_le16(readw(mmio
));
3692 memcpy(trailing_buf
, align_buf
, 1);
3698 * ata_pio_data_xfer - Transfer data by PIO
3699 * @adev: device to target
3701 * @buflen: buffer length
3702 * @write_data: read/write
3704 * Transfer data from/to the device data register by PIO.
3707 * Inherited from caller.
3710 void ata_pio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3711 unsigned int buflen
, int write_data
)
3713 struct ata_port
*ap
= adev
->ap
;
3714 unsigned int words
= buflen
>> 1;
3716 /* Transfer multiple of 2 bytes */
3718 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3720 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3722 /* Transfer trailing 1 byte, if any. */
3723 if (unlikely(buflen
& 0x01)) {
3724 u16 align_buf
[1] = { 0 };
3725 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3728 memcpy(align_buf
, trailing_buf
, 1);
3729 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3731 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3732 memcpy(trailing_buf
, align_buf
, 1);
3738 * ata_pio_data_xfer_noirq - Transfer data by PIO
3739 * @adev: device to target
3741 * @buflen: buffer length
3742 * @write_data: read/write
3744 * Transfer data from/to the device data register by PIO. Do the
3745 * transfer with interrupts disabled.
3748 * Inherited from caller.
3751 void ata_pio_data_xfer_noirq(struct ata_device
*adev
, unsigned char *buf
,
3752 unsigned int buflen
, int write_data
)
3754 unsigned long flags
;
3755 local_irq_save(flags
);
3756 ata_pio_data_xfer(adev
, buf
, buflen
, write_data
);
3757 local_irq_restore(flags
);
3762 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3763 * @qc: Command on going
3765 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3768 * Inherited from caller.
3771 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3773 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3774 struct scatterlist
*sg
= qc
->__sg
;
3775 struct ata_port
*ap
= qc
->ap
;
3777 unsigned int offset
;
3780 if (qc
->cursect
== (qc
->nsect
- 1))
3781 ap
->hsm_task_state
= HSM_ST_LAST
;
3783 page
= sg
[qc
->cursg
].page
;
3784 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3786 /* get the current page and offset */
3787 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3788 offset
%= PAGE_SIZE
;
3790 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3792 if (PageHighMem(page
)) {
3793 unsigned long flags
;
3795 /* FIXME: use a bounce buffer */
3796 local_irq_save(flags
);
3797 buf
= kmap_atomic(page
, KM_IRQ0
);
3799 /* do the actual data transfer */
3800 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3802 kunmap_atomic(buf
, KM_IRQ0
);
3803 local_irq_restore(flags
);
3805 buf
= page_address(page
);
3806 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3812 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3819 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3820 * @qc: Command on going
3822 * Transfer one or many ATA_SECT_SIZE of data from/to the
3823 * ATA device for the DRQ request.
3826 * Inherited from caller.
3829 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3831 if (is_multi_taskfile(&qc
->tf
)) {
3832 /* READ/WRITE MULTIPLE */
3835 WARN_ON(qc
->dev
->multi_count
== 0);
3837 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3845 * atapi_send_cdb - Write CDB bytes to hardware
3846 * @ap: Port to which ATAPI device is attached.
3847 * @qc: Taskfile currently active
3849 * When device has indicated its readiness to accept
3850 * a CDB, this function is called. Send the CDB.
3856 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3859 DPRINTK("send cdb\n");
3860 WARN_ON(qc
->dev
->cdb_len
< 12);
3862 ap
->ops
->data_xfer(qc
->dev
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3863 ata_altstatus(ap
); /* flush */
3865 switch (qc
->tf
.protocol
) {
3866 case ATA_PROT_ATAPI
:
3867 ap
->hsm_task_state
= HSM_ST
;
3869 case ATA_PROT_ATAPI_NODATA
:
3870 ap
->hsm_task_state
= HSM_ST_LAST
;
3872 case ATA_PROT_ATAPI_DMA
:
3873 ap
->hsm_task_state
= HSM_ST_LAST
;
3874 /* initiate bmdma */
3875 ap
->ops
->bmdma_start(qc
);
3881 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3882 * @qc: Command on going
3883 * @bytes: number of bytes
3885 * Transfer Transfer data from/to the ATAPI device.
3888 * Inherited from caller.
3892 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3894 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3895 struct scatterlist
*sg
= qc
->__sg
;
3896 struct ata_port
*ap
= qc
->ap
;
3899 unsigned int offset
, count
;
3901 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3902 ap
->hsm_task_state
= HSM_ST_LAST
;
3905 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3907 * The end of qc->sg is reached and the device expects
3908 * more data to transfer. In order not to overrun qc->sg
3909 * and fulfill length specified in the byte count register,
3910 * - for read case, discard trailing data from the device
3911 * - for write case, padding zero data to the device
3913 u16 pad_buf
[1] = { 0 };
3914 unsigned int words
= bytes
>> 1;
3917 if (words
) /* warning if bytes > 1 */
3918 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3919 "%u bytes trailing data\n", bytes
);
3921 for (i
= 0; i
< words
; i
++)
3922 ap
->ops
->data_xfer(qc
->dev
, (unsigned char*)pad_buf
, 2, do_write
);
3924 ap
->hsm_task_state
= HSM_ST_LAST
;
3928 sg
= &qc
->__sg
[qc
->cursg
];
3931 offset
= sg
->offset
+ qc
->cursg_ofs
;
3933 /* get the current page and offset */
3934 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3935 offset
%= PAGE_SIZE
;
3937 /* don't overrun current sg */
3938 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3940 /* don't cross page boundaries */
3941 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3943 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3945 if (PageHighMem(page
)) {
3946 unsigned long flags
;
3948 /* FIXME: use bounce buffer */
3949 local_irq_save(flags
);
3950 buf
= kmap_atomic(page
, KM_IRQ0
);
3952 /* do the actual data transfer */
3953 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3955 kunmap_atomic(buf
, KM_IRQ0
);
3956 local_irq_restore(flags
);
3958 buf
= page_address(page
);
3959 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3963 qc
->curbytes
+= count
;
3964 qc
->cursg_ofs
+= count
;
3966 if (qc
->cursg_ofs
== sg
->length
) {
3976 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3977 * @qc: Command on going
3979 * Transfer Transfer data from/to the ATAPI device.
3982 * Inherited from caller.
3985 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3987 struct ata_port
*ap
= qc
->ap
;
3988 struct ata_device
*dev
= qc
->dev
;
3989 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3990 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3992 /* Abuse qc->result_tf for temp storage of intermediate TF
3993 * here to save some kernel stack usage.
3994 * For normal completion, qc->result_tf is not relevant. For
3995 * error, qc->result_tf is later overwritten by ata_qc_complete().
3996 * So, the correctness of qc->result_tf is not affected.
3998 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
3999 ireason
= qc
->result_tf
.nsect
;
4000 bc_lo
= qc
->result_tf
.lbam
;
4001 bc_hi
= qc
->result_tf
.lbah
;
4002 bytes
= (bc_hi
<< 8) | bc_lo
;
4004 /* shall be cleared to zero, indicating xfer of data */
4005 if (ireason
& (1 << 0))
4008 /* make sure transfer direction matches expected */
4009 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
4010 if (do_write
!= i_write
)
4013 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
4015 __atapi_pio_bytes(qc
, bytes
);
4020 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
4021 qc
->err_mask
|= AC_ERR_HSM
;
4022 ap
->hsm_task_state
= HSM_ST_ERR
;
4026 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
4027 * @ap: the target ata_port
4031 * 1 if ok in workqueue, 0 otherwise.
4034 static inline int ata_hsm_ok_in_wq(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
4036 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4039 if (ap
->hsm_task_state
== HSM_ST_FIRST
) {
4040 if (qc
->tf
.protocol
== ATA_PROT_PIO
&&
4041 (qc
->tf
.flags
& ATA_TFLAG_WRITE
))
4044 if (is_atapi_taskfile(&qc
->tf
) &&
4045 !(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4053 * ata_hsm_qc_complete - finish a qc running on standard HSM
4054 * @qc: Command to complete
4055 * @in_wq: 1 if called from workqueue, 0 otherwise
4057 * Finish @qc which is running on standard HSM.
4060 * If @in_wq is zero, spin_lock_irqsave(host lock).
4061 * Otherwise, none on entry and grabs host lock.
4063 static void ata_hsm_qc_complete(struct ata_queued_cmd
*qc
, int in_wq
)
4065 struct ata_port
*ap
= qc
->ap
;
4066 unsigned long flags
;
4068 if (ap
->ops
->error_handler
) {
4070 spin_lock_irqsave(ap
->lock
, flags
);
4072 /* EH might have kicked in while host lock is
4075 qc
= ata_qc_from_tag(ap
, qc
->tag
);
4077 if (likely(!(qc
->err_mask
& AC_ERR_HSM
))) {
4079 ata_qc_complete(qc
);
4081 ata_port_freeze(ap
);
4084 spin_unlock_irqrestore(ap
->lock
, flags
);
4086 if (likely(!(qc
->err_mask
& AC_ERR_HSM
)))
4087 ata_qc_complete(qc
);
4089 ata_port_freeze(ap
);
4093 spin_lock_irqsave(ap
->lock
, flags
);
4095 ata_qc_complete(qc
);
4096 spin_unlock_irqrestore(ap
->lock
, flags
);
4098 ata_qc_complete(qc
);
4101 ata_altstatus(ap
); /* flush */
4105 * ata_hsm_move - move the HSM to the next state.
4106 * @ap: the target ata_port
4108 * @status: current device status
4109 * @in_wq: 1 if called from workqueue, 0 otherwise
4112 * 1 when poll next status needed, 0 otherwise.
4114 int ata_hsm_move(struct ata_port
*ap
, struct ata_queued_cmd
*qc
,
4115 u8 status
, int in_wq
)
4117 unsigned long flags
= 0;
4120 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
4122 /* Make sure ata_qc_issue_prot() does not throw things
4123 * like DMA polling into the workqueue. Notice that
4124 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
4126 WARN_ON(in_wq
!= ata_hsm_ok_in_wq(ap
, qc
));
4129 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4130 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
4132 switch (ap
->hsm_task_state
) {
4134 /* Send first data block or PACKET CDB */
4136 /* If polling, we will stay in the work queue after
4137 * sending the data. Otherwise, interrupt handler
4138 * takes over after sending the data.
4140 poll_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4142 /* check device status */
4143 if (unlikely((status
& ATA_DRQ
) == 0)) {
4144 /* handle BSY=0, DRQ=0 as error */
4145 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4146 /* device stops HSM for abort/error */
4147 qc
->err_mask
|= AC_ERR_DEV
;
4149 /* HSM violation. Let EH handle this */
4150 qc
->err_mask
|= AC_ERR_HSM
;
4152 ap
->hsm_task_state
= HSM_ST_ERR
;
4156 /* Device should not ask for data transfer (DRQ=1)
4157 * when it finds something wrong.
4158 * We ignore DRQ here and stop the HSM by
4159 * changing hsm_task_state to HSM_ST_ERR and
4160 * let the EH abort the command or reset the device.
4162 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4163 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4165 qc
->err_mask
|= AC_ERR_HSM
;
4166 ap
->hsm_task_state
= HSM_ST_ERR
;
4170 /* Send the CDB (atapi) or the first data block (ata pio out).
4171 * During the state transition, interrupt handler shouldn't
4172 * be invoked before the data transfer is complete and
4173 * hsm_task_state is changed. Hence, the following locking.
4176 spin_lock_irqsave(ap
->lock
, flags
);
4178 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
4179 /* PIO data out protocol.
4180 * send first data block.
4183 /* ata_pio_sectors() might change the state
4184 * to HSM_ST_LAST. so, the state is changed here
4185 * before ata_pio_sectors().
4187 ap
->hsm_task_state
= HSM_ST
;
4188 ata_pio_sectors(qc
);
4189 ata_altstatus(ap
); /* flush */
4192 atapi_send_cdb(ap
, qc
);
4195 spin_unlock_irqrestore(ap
->lock
, flags
);
4197 /* if polling, ata_pio_task() handles the rest.
4198 * otherwise, interrupt handler takes over from here.
4203 /* complete command or read/write the data register */
4204 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4205 /* ATAPI PIO protocol */
4206 if ((status
& ATA_DRQ
) == 0) {
4207 /* No more data to transfer or device error.
4208 * Device error will be tagged in HSM_ST_LAST.
4210 ap
->hsm_task_state
= HSM_ST_LAST
;
4214 /* Device should not ask for data transfer (DRQ=1)
4215 * when it finds something wrong.
4216 * We ignore DRQ here and stop the HSM by
4217 * changing hsm_task_state to HSM_ST_ERR and
4218 * let the EH abort the command or reset the device.
4220 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4221 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4223 qc
->err_mask
|= AC_ERR_HSM
;
4224 ap
->hsm_task_state
= HSM_ST_ERR
;
4228 atapi_pio_bytes(qc
);
4230 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4231 /* bad ireason reported by device */
4235 /* ATA PIO protocol */
4236 if (unlikely((status
& ATA_DRQ
) == 0)) {
4237 /* handle BSY=0, DRQ=0 as error */
4238 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4239 /* device stops HSM for abort/error */
4240 qc
->err_mask
|= AC_ERR_DEV
;
4242 /* HSM violation. Let EH handle this */
4243 qc
->err_mask
|= AC_ERR_HSM
;
4245 ap
->hsm_task_state
= HSM_ST_ERR
;
4249 /* For PIO reads, some devices may ask for
4250 * data transfer (DRQ=1) alone with ERR=1.
4251 * We respect DRQ here and transfer one
4252 * block of junk data before changing the
4253 * hsm_task_state to HSM_ST_ERR.
4255 * For PIO writes, ERR=1 DRQ=1 doesn't make
4256 * sense since the data block has been
4257 * transferred to the device.
4259 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4260 /* data might be corrputed */
4261 qc
->err_mask
|= AC_ERR_DEV
;
4263 if (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
)) {
4264 ata_pio_sectors(qc
);
4266 status
= ata_wait_idle(ap
);
4269 if (status
& (ATA_BUSY
| ATA_DRQ
))
4270 qc
->err_mask
|= AC_ERR_HSM
;
4272 /* ata_pio_sectors() might change the
4273 * state to HSM_ST_LAST. so, the state
4274 * is changed after ata_pio_sectors().
4276 ap
->hsm_task_state
= HSM_ST_ERR
;
4280 ata_pio_sectors(qc
);
4282 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4283 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4286 status
= ata_wait_idle(ap
);
4291 ata_altstatus(ap
); /* flush */
4296 if (unlikely(!ata_ok(status
))) {
4297 qc
->err_mask
|= __ac_err_mask(status
);
4298 ap
->hsm_task_state
= HSM_ST_ERR
;
4302 /* no more data to transfer */
4303 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4304 ap
->id
, qc
->dev
->devno
, status
);
4306 WARN_ON(qc
->err_mask
);
4308 ap
->hsm_task_state
= HSM_ST_IDLE
;
4310 /* complete taskfile transaction */
4311 ata_hsm_qc_complete(qc
, in_wq
);
4317 /* make sure qc->err_mask is available to
4318 * know what's wrong and recover
4320 WARN_ON(qc
->err_mask
== 0);
4322 ap
->hsm_task_state
= HSM_ST_IDLE
;
4324 /* complete taskfile transaction */
4325 ata_hsm_qc_complete(qc
, in_wq
);
4337 static void ata_pio_task(void *_data
)
4339 struct ata_queued_cmd
*qc
= _data
;
4340 struct ata_port
*ap
= qc
->ap
;
4345 WARN_ON(ap
->hsm_task_state
== HSM_ST_IDLE
);
4348 * This is purely heuristic. This is a fast path.
4349 * Sometimes when we enter, BSY will be cleared in
4350 * a chk-status or two. If not, the drive is probably seeking
4351 * or something. Snooze for a couple msecs, then
4352 * chk-status again. If still busy, queue delayed work.
4354 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
4355 if (status
& ATA_BUSY
) {
4357 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
4358 if (status
& ATA_BUSY
) {
4359 ata_port_queue_task(ap
, ata_pio_task
, qc
, ATA_SHORT_PAUSE
);
4365 poll_next
= ata_hsm_move(ap
, qc
, status
, 1);
4367 /* another command or interrupt handler
4368 * may be running at this point.
4375 * ata_qc_new - Request an available ATA command, for queueing
4376 * @ap: Port associated with device @dev
4377 * @dev: Device from whom we request an available command structure
4383 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4385 struct ata_queued_cmd
*qc
= NULL
;
4388 /* no command while frozen */
4389 if (unlikely(ap
->pflags
& ATA_PFLAG_FROZEN
))
4392 /* the last tag is reserved for internal command. */
4393 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4394 if (!test_and_set_bit(i
, &ap
->qc_allocated
)) {
4395 qc
= __ata_qc_from_tag(ap
, i
);
4406 * ata_qc_new_init - Request an available ATA command, and initialize it
4407 * @dev: Device from whom we request an available command structure
4413 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4415 struct ata_port
*ap
= dev
->ap
;
4416 struct ata_queued_cmd
*qc
;
4418 qc
= ata_qc_new(ap
);
4431 * ata_qc_free - free unused ata_queued_cmd
4432 * @qc: Command to complete
4434 * Designed to free unused ata_queued_cmd object
4435 * in case something prevents using it.
4438 * spin_lock_irqsave(host lock)
4440 void ata_qc_free(struct ata_queued_cmd
*qc
)
4442 struct ata_port
*ap
= qc
->ap
;
4445 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4449 if (likely(ata_tag_valid(tag
))) {
4450 qc
->tag
= ATA_TAG_POISON
;
4451 clear_bit(tag
, &ap
->qc_allocated
);
4455 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4457 struct ata_port
*ap
= qc
->ap
;
4459 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4460 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4462 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4465 /* command should be marked inactive atomically with qc completion */
4466 if (qc
->tf
.protocol
== ATA_PROT_NCQ
)
4467 ap
->sactive
&= ~(1 << qc
->tag
);
4469 ap
->active_tag
= ATA_TAG_POISON
;
4471 /* atapi: mark qc as inactive to prevent the interrupt handler
4472 * from completing the command twice later, before the error handler
4473 * is called. (when rc != 0 and atapi request sense is needed)
4475 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4476 ap
->qc_active
&= ~(1 << qc
->tag
);
4478 /* call completion callback */
4479 qc
->complete_fn(qc
);
4483 * ata_qc_complete - Complete an active ATA command
4484 * @qc: Command to complete
4485 * @err_mask: ATA Status register contents
4487 * Indicate to the mid and upper layers that an ATA
4488 * command has completed, with either an ok or not-ok status.
4491 * spin_lock_irqsave(host lock)
4493 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4495 struct ata_port
*ap
= qc
->ap
;
4497 /* XXX: New EH and old EH use different mechanisms to
4498 * synchronize EH with regular execution path.
4500 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4501 * Normal execution path is responsible for not accessing a
4502 * failed qc. libata core enforces the rule by returning NULL
4503 * from ata_qc_from_tag() for failed qcs.
4505 * Old EH depends on ata_qc_complete() nullifying completion
4506 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4507 * not synchronize with interrupt handler. Only PIO task is
4510 if (ap
->ops
->error_handler
) {
4511 WARN_ON(ap
->pflags
& ATA_PFLAG_FROZEN
);
4513 if (unlikely(qc
->err_mask
))
4514 qc
->flags
|= ATA_QCFLAG_FAILED
;
4516 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4517 if (!ata_tag_internal(qc
->tag
)) {
4518 /* always fill result TF for failed qc */
4519 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4520 ata_qc_schedule_eh(qc
);
4525 /* read result TF if requested */
4526 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4527 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4529 __ata_qc_complete(qc
);
4531 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4534 /* read result TF if failed or requested */
4535 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4536 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4538 __ata_qc_complete(qc
);
4543 * ata_qc_complete_multiple - Complete multiple qcs successfully
4544 * @ap: port in question
4545 * @qc_active: new qc_active mask
4546 * @finish_qc: LLDD callback invoked before completing a qc
4548 * Complete in-flight commands. This functions is meant to be
4549 * called from low-level driver's interrupt routine to complete
4550 * requests normally. ap->qc_active and @qc_active is compared
4551 * and commands are completed accordingly.
4554 * spin_lock_irqsave(host lock)
4557 * Number of completed commands on success, -errno otherwise.
4559 int ata_qc_complete_multiple(struct ata_port
*ap
, u32 qc_active
,
4560 void (*finish_qc
)(struct ata_queued_cmd
*))
4566 done_mask
= ap
->qc_active
^ qc_active
;
4568 if (unlikely(done_mask
& qc_active
)) {
4569 ata_port_printk(ap
, KERN_ERR
, "illegal qc_active transition "
4570 "(%08x->%08x)\n", ap
->qc_active
, qc_active
);
4574 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
4575 struct ata_queued_cmd
*qc
;
4577 if (!(done_mask
& (1 << i
)))
4580 if ((qc
= ata_qc_from_tag(ap
, i
))) {
4583 ata_qc_complete(qc
);
4591 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4593 struct ata_port
*ap
= qc
->ap
;
4595 switch (qc
->tf
.protocol
) {
4598 case ATA_PROT_ATAPI_DMA
:
4601 case ATA_PROT_ATAPI
:
4603 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4616 * ata_qc_issue - issue taskfile to device
4617 * @qc: command to issue to device
4619 * Prepare an ATA command to submission to device.
4620 * This includes mapping the data into a DMA-able
4621 * area, filling in the S/G table, and finally
4622 * writing the taskfile to hardware, starting the command.
4625 * spin_lock_irqsave(host lock)
4627 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4629 struct ata_port
*ap
= qc
->ap
;
4631 /* Make sure only one non-NCQ command is outstanding. The
4632 * check is skipped for old EH because it reuses active qc to
4633 * request ATAPI sense.
4635 WARN_ON(ap
->ops
->error_handler
&& ata_tag_valid(ap
->active_tag
));
4637 if (qc
->tf
.protocol
== ATA_PROT_NCQ
) {
4638 WARN_ON(ap
->sactive
& (1 << qc
->tag
));
4639 ap
->sactive
|= 1 << qc
->tag
;
4641 WARN_ON(ap
->sactive
);
4642 ap
->active_tag
= qc
->tag
;
4645 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4646 ap
->qc_active
|= 1 << qc
->tag
;
4648 if (ata_should_dma_map(qc
)) {
4649 if (qc
->flags
& ATA_QCFLAG_SG
) {
4650 if (ata_sg_setup(qc
))
4652 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4653 if (ata_sg_setup_one(qc
))
4657 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4660 ap
->ops
->qc_prep(qc
);
4662 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4663 if (unlikely(qc
->err_mask
))
4668 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4669 qc
->err_mask
|= AC_ERR_SYSTEM
;
4671 ata_qc_complete(qc
);
4675 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4676 * @qc: command to issue to device
4678 * Using various libata functions and hooks, this function
4679 * starts an ATA command. ATA commands are grouped into
4680 * classes called "protocols", and issuing each type of protocol
4681 * is slightly different.
4683 * May be used as the qc_issue() entry in ata_port_operations.
4686 * spin_lock_irqsave(host lock)
4689 * Zero on success, AC_ERR_* mask on failure
4692 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4694 struct ata_port
*ap
= qc
->ap
;
4696 /* Use polling pio if the LLD doesn't handle
4697 * interrupt driven pio and atapi CDB interrupt.
4699 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4700 switch (qc
->tf
.protocol
) {
4702 case ATA_PROT_ATAPI
:
4703 case ATA_PROT_ATAPI_NODATA
:
4704 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4706 case ATA_PROT_ATAPI_DMA
:
4707 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4708 /* see ata_dma_blacklisted() */
4716 /* select the device */
4717 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4719 /* start the command */
4720 switch (qc
->tf
.protocol
) {
4721 case ATA_PROT_NODATA
:
4722 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4723 ata_qc_set_polling(qc
);
4725 ata_tf_to_host(ap
, &qc
->tf
);
4726 ap
->hsm_task_state
= HSM_ST_LAST
;
4728 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4729 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4734 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4736 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4737 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4738 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4739 ap
->hsm_task_state
= HSM_ST_LAST
;
4743 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4744 ata_qc_set_polling(qc
);
4746 ata_tf_to_host(ap
, &qc
->tf
);
4748 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4749 /* PIO data out protocol */
4750 ap
->hsm_task_state
= HSM_ST_FIRST
;
4751 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4753 /* always send first data block using
4754 * the ata_pio_task() codepath.
4757 /* PIO data in protocol */
4758 ap
->hsm_task_state
= HSM_ST
;
4760 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4761 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4763 /* if polling, ata_pio_task() handles the rest.
4764 * otherwise, interrupt handler takes over from here.
4770 case ATA_PROT_ATAPI
:
4771 case ATA_PROT_ATAPI_NODATA
:
4772 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4773 ata_qc_set_polling(qc
);
4775 ata_tf_to_host(ap
, &qc
->tf
);
4777 ap
->hsm_task_state
= HSM_ST_FIRST
;
4779 /* send cdb by polling if no cdb interrupt */
4780 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4781 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4782 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4785 case ATA_PROT_ATAPI_DMA
:
4786 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4788 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4789 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4790 ap
->hsm_task_state
= HSM_ST_FIRST
;
4792 /* send cdb by polling if no cdb interrupt */
4793 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4794 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4799 return AC_ERR_SYSTEM
;
4806 * ata_host_intr - Handle host interrupt for given (port, task)
4807 * @ap: Port on which interrupt arrived (possibly...)
4808 * @qc: Taskfile currently active in engine
4810 * Handle host interrupt for given queued command. Currently,
4811 * only DMA interrupts are handled. All other commands are
4812 * handled via polling with interrupts disabled (nIEN bit).
4815 * spin_lock_irqsave(host lock)
4818 * One if interrupt was handled, zero if not (shared irq).
4821 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4822 struct ata_queued_cmd
*qc
)
4824 u8 status
, host_stat
= 0;
4826 VPRINTK("ata%u: protocol %d task_state %d\n",
4827 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4829 /* Check whether we are expecting interrupt in this state */
4830 switch (ap
->hsm_task_state
) {
4832 /* Some pre-ATAPI-4 devices assert INTRQ
4833 * at this state when ready to receive CDB.
4836 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4837 * The flag was turned on only for atapi devices.
4838 * No need to check is_atapi_taskfile(&qc->tf) again.
4840 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4844 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4845 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4846 /* check status of DMA engine */
4847 host_stat
= ap
->ops
->bmdma_status(ap
);
4848 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4850 /* if it's not our irq... */
4851 if (!(host_stat
& ATA_DMA_INTR
))
4854 /* before we do anything else, clear DMA-Start bit */
4855 ap
->ops
->bmdma_stop(qc
);
4857 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4858 /* error when transfering data to/from memory */
4859 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4860 ap
->hsm_task_state
= HSM_ST_ERR
;
4870 /* check altstatus */
4871 status
= ata_altstatus(ap
);
4872 if (status
& ATA_BUSY
)
4875 /* check main status, clearing INTRQ */
4876 status
= ata_chk_status(ap
);
4877 if (unlikely(status
& ATA_BUSY
))
4880 /* ack bmdma irq events */
4881 ap
->ops
->irq_clear(ap
);
4883 ata_hsm_move(ap
, qc
, status
, 0);
4884 return 1; /* irq handled */
4887 ap
->stats
.idle_irq
++;
4890 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4891 ata_irq_ack(ap
, 0); /* debug trap */
4892 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4896 return 0; /* irq not handled */
4900 * ata_interrupt - Default ATA host interrupt handler
4901 * @irq: irq line (unused)
4902 * @dev_instance: pointer to our ata_host information structure
4904 * Default interrupt handler for PCI IDE devices. Calls
4905 * ata_host_intr() for each port that is not disabled.
4908 * Obtains host lock during operation.
4911 * IRQ_NONE or IRQ_HANDLED.
4914 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
)
4916 struct ata_host
*host
= dev_instance
;
4918 unsigned int handled
= 0;
4919 unsigned long flags
;
4921 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4922 spin_lock_irqsave(&host
->lock
, flags
);
4924 for (i
= 0; i
< host
->n_ports
; i
++) {
4925 struct ata_port
*ap
;
4927 ap
= host
->ports
[i
];
4929 !(ap
->flags
& ATA_FLAG_DISABLED
)) {
4930 struct ata_queued_cmd
*qc
;
4932 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4933 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4934 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4935 handled
|= ata_host_intr(ap
, qc
);
4939 spin_unlock_irqrestore(&host
->lock
, flags
);
4941 return IRQ_RETVAL(handled
);
4945 * sata_scr_valid - test whether SCRs are accessible
4946 * @ap: ATA port to test SCR accessibility for
4948 * Test whether SCRs are accessible for @ap.
4954 * 1 if SCRs are accessible, 0 otherwise.
4956 int sata_scr_valid(struct ata_port
*ap
)
4958 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4962 * sata_scr_read - read SCR register of the specified port
4963 * @ap: ATA port to read SCR for
4965 * @val: Place to store read value
4967 * Read SCR register @reg of @ap into *@val. This function is
4968 * guaranteed to succeed if the cable type of the port is SATA
4969 * and the port implements ->scr_read.
4975 * 0 on success, negative errno on failure.
4977 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4979 if (sata_scr_valid(ap
)) {
4980 *val
= ap
->ops
->scr_read(ap
, reg
);
4987 * sata_scr_write - write SCR register of the specified port
4988 * @ap: ATA port to write SCR for
4989 * @reg: SCR to write
4990 * @val: value to write
4992 * Write @val to SCR register @reg of @ap. This function is
4993 * guaranteed to succeed if the cable type of the port is SATA
4994 * and the port implements ->scr_read.
5000 * 0 on success, negative errno on failure.
5002 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
5004 if (sata_scr_valid(ap
)) {
5005 ap
->ops
->scr_write(ap
, reg
, val
);
5012 * sata_scr_write_flush - write SCR register of the specified port and flush
5013 * @ap: ATA port to write SCR for
5014 * @reg: SCR to write
5015 * @val: value to write
5017 * This function is identical to sata_scr_write() except that this
5018 * function performs flush after writing to the register.
5024 * 0 on success, negative errno on failure.
5026 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
5028 if (sata_scr_valid(ap
)) {
5029 ap
->ops
->scr_write(ap
, reg
, val
);
5030 ap
->ops
->scr_read(ap
, reg
);
5037 * ata_port_online - test whether the given port is online
5038 * @ap: ATA port to test
5040 * Test whether @ap is online. Note that this function returns 0
5041 * if online status of @ap cannot be obtained, so
5042 * ata_port_online(ap) != !ata_port_offline(ap).
5048 * 1 if the port online status is available and online.
5050 int ata_port_online(struct ata_port
*ap
)
5054 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
5060 * ata_port_offline - test whether the given port is offline
5061 * @ap: ATA port to test
5063 * Test whether @ap is offline. Note that this function returns
5064 * 0 if offline status of @ap cannot be obtained, so
5065 * ata_port_online(ap) != !ata_port_offline(ap).
5071 * 1 if the port offline status is available and offline.
5073 int ata_port_offline(struct ata_port
*ap
)
5077 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
5082 int ata_flush_cache(struct ata_device
*dev
)
5084 unsigned int err_mask
;
5087 if (!ata_try_flush_cache(dev
))
5090 if (ata_id_has_flush_ext(dev
->id
))
5091 cmd
= ATA_CMD_FLUSH_EXT
;
5093 cmd
= ATA_CMD_FLUSH
;
5095 err_mask
= ata_do_simple_cmd(dev
, cmd
);
5097 ata_dev_printk(dev
, KERN_ERR
, "failed to flush cache\n");
5104 static int ata_host_request_pm(struct ata_host
*host
, pm_message_t mesg
,
5105 unsigned int action
, unsigned int ehi_flags
,
5108 unsigned long flags
;
5111 for (i
= 0; i
< host
->n_ports
; i
++) {
5112 struct ata_port
*ap
= host
->ports
[i
];
5114 /* Previous resume operation might still be in
5115 * progress. Wait for PM_PENDING to clear.
5117 if (ap
->pflags
& ATA_PFLAG_PM_PENDING
) {
5118 ata_port_wait_eh(ap
);
5119 WARN_ON(ap
->pflags
& ATA_PFLAG_PM_PENDING
);
5122 /* request PM ops to EH */
5123 spin_lock_irqsave(ap
->lock
, flags
);
5128 ap
->pm_result
= &rc
;
5131 ap
->pflags
|= ATA_PFLAG_PM_PENDING
;
5132 ap
->eh_info
.action
|= action
;
5133 ap
->eh_info
.flags
|= ehi_flags
;
5135 ata_port_schedule_eh(ap
);
5137 spin_unlock_irqrestore(ap
->lock
, flags
);
5139 /* wait and check result */
5141 ata_port_wait_eh(ap
);
5142 WARN_ON(ap
->pflags
& ATA_PFLAG_PM_PENDING
);
5152 * ata_host_suspend - suspend host
5153 * @host: host to suspend
5156 * Suspend @host. Actual operation is performed by EH. This
5157 * function requests EH to perform PM operations and waits for EH
5161 * Kernel thread context (may sleep).
5164 * 0 on success, -errno on failure.
5166 int ata_host_suspend(struct ata_host
*host
, pm_message_t mesg
)
5170 rc
= ata_host_request_pm(host
, mesg
, 0, ATA_EHI_QUIET
, 1);
5174 /* EH is quiescent now. Fail if we have any ready device.
5175 * This happens if hotplug occurs between completion of device
5176 * suspension and here.
5178 for (i
= 0; i
< host
->n_ports
; i
++) {
5179 struct ata_port
*ap
= host
->ports
[i
];
5181 for (j
= 0; j
< ATA_MAX_DEVICES
; j
++) {
5182 struct ata_device
*dev
= &ap
->device
[j
];
5184 if (ata_dev_ready(dev
)) {
5185 ata_port_printk(ap
, KERN_WARNING
,
5186 "suspend failed, device %d "
5187 "still active\n", dev
->devno
);
5194 host
->dev
->power
.power_state
= mesg
;
5198 ata_host_resume(host
);
5203 * ata_host_resume - resume host
5204 * @host: host to resume
5206 * Resume @host. Actual operation is performed by EH. This
5207 * function requests EH to perform PM operations and returns.
5208 * Note that all resume operations are performed parallely.
5211 * Kernel thread context (may sleep).
5213 void ata_host_resume(struct ata_host
*host
)
5215 ata_host_request_pm(host
, PMSG_ON
, ATA_EH_SOFTRESET
,
5216 ATA_EHI_NO_AUTOPSY
| ATA_EHI_QUIET
, 0);
5217 host
->dev
->power
.power_state
= PMSG_ON
;
5221 * ata_port_start - Set port up for dma.
5222 * @ap: Port to initialize
5224 * Called just after data structures for each port are
5225 * initialized. Allocates space for PRD table.
5227 * May be used as the port_start() entry in ata_port_operations.
5230 * Inherited from caller.
5233 int ata_port_start (struct ata_port
*ap
)
5235 struct device
*dev
= ap
->dev
;
5238 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
5242 rc
= ata_pad_alloc(ap
, dev
);
5244 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5248 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
5255 * ata_port_stop - Undo ata_port_start()
5256 * @ap: Port to shut down
5258 * Frees the PRD table.
5260 * May be used as the port_stop() entry in ata_port_operations.
5263 * Inherited from caller.
5266 void ata_port_stop (struct ata_port
*ap
)
5268 struct device
*dev
= ap
->dev
;
5270 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5271 ata_pad_free(ap
, dev
);
5274 void ata_host_stop (struct ata_host
*host
)
5276 if (host
->mmio_base
)
5277 iounmap(host
->mmio_base
);
5281 * ata_dev_init - Initialize an ata_device structure
5282 * @dev: Device structure to initialize
5284 * Initialize @dev in preparation for probing.
5287 * Inherited from caller.
5289 void ata_dev_init(struct ata_device
*dev
)
5291 struct ata_port
*ap
= dev
->ap
;
5292 unsigned long flags
;
5294 /* SATA spd limit is bound to the first device */
5295 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5297 /* High bits of dev->flags are used to record warm plug
5298 * requests which occur asynchronously. Synchronize using
5301 spin_lock_irqsave(ap
->lock
, flags
);
5302 dev
->flags
&= ~ATA_DFLAG_INIT_MASK
;
5303 spin_unlock_irqrestore(ap
->lock
, flags
);
5305 memset((void *)dev
+ ATA_DEVICE_CLEAR_OFFSET
, 0,
5306 sizeof(*dev
) - ATA_DEVICE_CLEAR_OFFSET
);
5307 dev
->pio_mask
= UINT_MAX
;
5308 dev
->mwdma_mask
= UINT_MAX
;
5309 dev
->udma_mask
= UINT_MAX
;
5313 * ata_port_init - Initialize an ata_port structure
5314 * @ap: Structure to initialize
5315 * @host: Collection of hosts to which @ap belongs
5316 * @ent: Probe information provided by low-level driver
5317 * @port_no: Port number associated with this ata_port
5319 * Initialize a new ata_port structure.
5322 * Inherited from caller.
5324 void ata_port_init(struct ata_port
*ap
, struct ata_host
*host
,
5325 const struct ata_probe_ent
*ent
, unsigned int port_no
)
5329 ap
->lock
= &host
->lock
;
5330 ap
->flags
= ATA_FLAG_DISABLED
;
5331 ap
->id
= ata_unique_id
++;
5332 ap
->ctl
= ATA_DEVCTL_OBS
;
5335 ap
->port_no
= port_no
;
5336 if (port_no
== 1 && ent
->pinfo2
) {
5337 ap
->pio_mask
= ent
->pinfo2
->pio_mask
;
5338 ap
->mwdma_mask
= ent
->pinfo2
->mwdma_mask
;
5339 ap
->udma_mask
= ent
->pinfo2
->udma_mask
;
5340 ap
->flags
|= ent
->pinfo2
->flags
;
5341 ap
->ops
= ent
->pinfo2
->port_ops
;
5343 ap
->pio_mask
= ent
->pio_mask
;
5344 ap
->mwdma_mask
= ent
->mwdma_mask
;
5345 ap
->udma_mask
= ent
->udma_mask
;
5346 ap
->flags
|= ent
->port_flags
;
5347 ap
->ops
= ent
->port_ops
;
5349 ap
->hw_sata_spd_limit
= UINT_MAX
;
5350 ap
->active_tag
= ATA_TAG_POISON
;
5351 ap
->last_ctl
= 0xFF;
5353 #if defined(ATA_VERBOSE_DEBUG)
5354 /* turn on all debugging levels */
5355 ap
->msg_enable
= 0x00FF;
5356 #elif defined(ATA_DEBUG)
5357 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_INFO
| ATA_MSG_CTL
| ATA_MSG_WARN
| ATA_MSG_ERR
;
5359 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_ERR
| ATA_MSG_WARN
;
5362 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
5363 INIT_WORK(&ap
->hotplug_task
, ata_scsi_hotplug
, ap
);
5364 INIT_WORK(&ap
->scsi_rescan_task
, ata_scsi_dev_rescan
, ap
);
5365 INIT_LIST_HEAD(&ap
->eh_done_q
);
5366 init_waitqueue_head(&ap
->eh_wait_q
);
5368 /* set cable type */
5369 ap
->cbl
= ATA_CBL_NONE
;
5370 if (ap
->flags
& ATA_FLAG_SATA
)
5371 ap
->cbl
= ATA_CBL_SATA
;
5373 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
5374 struct ata_device
*dev
= &ap
->device
[i
];
5381 ap
->stats
.unhandled_irq
= 1;
5382 ap
->stats
.idle_irq
= 1;
5385 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
5389 * ata_port_init_shost - Initialize SCSI host associated with ATA port
5390 * @ap: ATA port to initialize SCSI host for
5391 * @shost: SCSI host associated with @ap
5393 * Initialize SCSI host @shost associated with ATA port @ap.
5396 * Inherited from caller.
5398 static void ata_port_init_shost(struct ata_port
*ap
, struct Scsi_Host
*shost
)
5400 ap
->scsi_host
= shost
;
5402 shost
->unique_id
= ap
->id
;
5405 shost
->max_channel
= 1;
5406 shost
->max_cmd_len
= 12;
5410 * ata_port_add - Attach low-level ATA driver to system
5411 * @ent: Information provided by low-level driver
5412 * @host: Collections of ports to which we add
5413 * @port_no: Port number associated with this host
5415 * Attach low-level ATA driver to system.
5418 * PCI/etc. bus probe sem.
5421 * New ata_port on success, for NULL on error.
5423 static struct ata_port
* ata_port_add(const struct ata_probe_ent
*ent
,
5424 struct ata_host
*host
,
5425 unsigned int port_no
)
5427 struct Scsi_Host
*shost
;
5428 struct ata_port
*ap
;
5432 if (!ent
->port_ops
->error_handler
&&
5433 !(ent
->port_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
5434 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
5439 shost
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
5443 shost
->transportt
= &ata_scsi_transport_template
;
5445 ap
= ata_shost_to_port(shost
);
5447 ata_port_init(ap
, host
, ent
, port_no
);
5448 ata_port_init_shost(ap
, shost
);
5454 * ata_sas_host_init - Initialize a host struct
5455 * @host: host to initialize
5456 * @dev: device host is attached to
5457 * @flags: host flags
5461 * PCI/etc. bus probe sem.
5465 void ata_host_init(struct ata_host
*host
, struct device
*dev
,
5466 unsigned long flags
, const struct ata_port_operations
*ops
)
5468 spin_lock_init(&host
->lock
);
5470 host
->flags
= flags
;
5475 * ata_device_add - Register hardware device with ATA and SCSI layers
5476 * @ent: Probe information describing hardware device to be registered
5478 * This function processes the information provided in the probe
5479 * information struct @ent, allocates the necessary ATA and SCSI
5480 * host information structures, initializes them, and registers
5481 * everything with requisite kernel subsystems.
5483 * This function requests irqs, probes the ATA bus, and probes
5487 * PCI/etc. bus probe sem.
5490 * Number of ports registered. Zero on error (no ports registered).
5492 int ata_device_add(const struct ata_probe_ent
*ent
)
5495 struct device
*dev
= ent
->dev
;
5496 struct ata_host
*host
;
5501 if (ent
->irq
== 0) {
5502 dev_printk(KERN_ERR
, dev
, "is not available: No interrupt assigned.\n");
5505 /* alloc a container for our list of ATA ports (buses) */
5506 host
= kzalloc(sizeof(struct ata_host
) +
5507 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
5511 ata_host_init(host
, dev
, ent
->_host_flags
, ent
->port_ops
);
5512 host
->n_ports
= ent
->n_ports
;
5513 host
->irq
= ent
->irq
;
5514 host
->irq2
= ent
->irq2
;
5515 host
->mmio_base
= ent
->mmio_base
;
5516 host
->private_data
= ent
->private_data
;
5518 /* register each port bound to this device */
5519 for (i
= 0; i
< host
->n_ports
; i
++) {
5520 struct ata_port
*ap
;
5521 unsigned long xfer_mode_mask
;
5522 int irq_line
= ent
->irq
;
5524 ap
= ata_port_add(ent
, host
, i
);
5525 host
->ports
[i
] = ap
;
5530 if (ent
->dummy_port_mask
& (1 << i
)) {
5531 ata_port_printk(ap
, KERN_INFO
, "DUMMY\n");
5532 ap
->ops
= &ata_dummy_port_ops
;
5537 rc
= ap
->ops
->port_start(ap
);
5539 host
->ports
[i
] = NULL
;
5540 scsi_host_put(ap
->scsi_host
);
5544 /* Report the secondary IRQ for second channel legacy */
5545 if (i
== 1 && ent
->irq2
)
5546 irq_line
= ent
->irq2
;
5548 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
5549 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
5550 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
5552 /* print per-port info to dmesg */
5553 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
5554 "ctl 0x%lX bmdma 0x%lX irq %d\n",
5555 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
5556 ata_mode_string(xfer_mode_mask
),
5557 ap
->ioaddr
.cmd_addr
,
5558 ap
->ioaddr
.ctl_addr
,
5559 ap
->ioaddr
.bmdma_addr
,
5563 host
->ops
->irq_clear(ap
);
5564 ata_eh_freeze_port(ap
); /* freeze port before requesting IRQ */
5567 /* obtain irq, that may be shared between channels */
5568 rc
= request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5571 dev_printk(KERN_ERR
, dev
, "irq %lu request failed: %d\n",
5576 /* do we have a second IRQ for the other channel, eg legacy mode */
5578 /* We will get weird core code crashes later if this is true
5580 BUG_ON(ent
->irq
== ent
->irq2
);
5582 rc
= request_irq(ent
->irq2
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5585 dev_printk(KERN_ERR
, dev
, "irq %lu request failed: %d\n",
5587 goto err_out_free_irq
;
5591 /* perform each probe synchronously */
5592 DPRINTK("probe begin\n");
5593 for (i
= 0; i
< host
->n_ports
; i
++) {
5594 struct ata_port
*ap
= host
->ports
[i
];
5598 /* init sata_spd_limit to the current value */
5599 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
5600 int spd
= (scontrol
>> 4) & 0xf;
5601 ap
->hw_sata_spd_limit
&= (1 << spd
) - 1;
5603 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5605 rc
= scsi_add_host(ap
->scsi_host
, dev
);
5607 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
5608 /* FIXME: do something useful here */
5609 /* FIXME: handle unconditional calls to
5610 * scsi_scan_host and ata_host_remove, below,
5615 if (ap
->ops
->error_handler
) {
5616 struct ata_eh_info
*ehi
= &ap
->eh_info
;
5617 unsigned long flags
;
5621 /* kick EH for boot probing */
5622 spin_lock_irqsave(ap
->lock
, flags
);
5624 ehi
->probe_mask
= (1 << ATA_MAX_DEVICES
) - 1;
5625 ehi
->action
|= ATA_EH_SOFTRESET
;
5626 ehi
->flags
|= ATA_EHI_NO_AUTOPSY
| ATA_EHI_QUIET
;
5628 ap
->pflags
|= ATA_PFLAG_LOADING
;
5629 ata_port_schedule_eh(ap
);
5631 spin_unlock_irqrestore(ap
->lock
, flags
);
5633 /* wait for EH to finish */
5634 ata_port_wait_eh(ap
);
5636 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5637 rc
= ata_bus_probe(ap
);
5638 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5641 /* FIXME: do something useful here?
5642 * Current libata behavior will
5643 * tear down everything when
5644 * the module is removed
5645 * or the h/w is unplugged.
5651 /* probes are done, now scan each port's disk(s) */
5652 DPRINTK("host probe begin\n");
5653 for (i
= 0; i
< host
->n_ports
; i
++) {
5654 struct ata_port
*ap
= host
->ports
[i
];
5656 ata_scsi_scan_host(ap
);
5659 dev_set_drvdata(dev
, host
);
5661 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5662 return ent
->n_ports
; /* success */
5665 free_irq(ent
->irq
, host
);
5667 for (i
= 0; i
< host
->n_ports
; i
++) {
5668 struct ata_port
*ap
= host
->ports
[i
];
5670 ap
->ops
->port_stop(ap
);
5671 scsi_host_put(ap
->scsi_host
);
5676 VPRINTK("EXIT, returning 0\n");
5681 * ata_port_detach - Detach ATA port in prepration of device removal
5682 * @ap: ATA port to be detached
5684 * Detach all ATA devices and the associated SCSI devices of @ap;
5685 * then, remove the associated SCSI host. @ap is guaranteed to
5686 * be quiescent on return from this function.
5689 * Kernel thread context (may sleep).
5691 void ata_port_detach(struct ata_port
*ap
)
5693 unsigned long flags
;
5696 if (!ap
->ops
->error_handler
)
5699 /* tell EH we're leaving & flush EH */
5700 spin_lock_irqsave(ap
->lock
, flags
);
5701 ap
->pflags
|= ATA_PFLAG_UNLOADING
;
5702 spin_unlock_irqrestore(ap
->lock
, flags
);
5704 ata_port_wait_eh(ap
);
5706 /* EH is now guaranteed to see UNLOADING, so no new device
5707 * will be attached. Disable all existing devices.
5709 spin_lock_irqsave(ap
->lock
, flags
);
5711 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
5712 ata_dev_disable(&ap
->device
[i
]);
5714 spin_unlock_irqrestore(ap
->lock
, flags
);
5716 /* Final freeze & EH. All in-flight commands are aborted. EH
5717 * will be skipped and retrials will be terminated with bad
5720 spin_lock_irqsave(ap
->lock
, flags
);
5721 ata_port_freeze(ap
); /* won't be thawed */
5722 spin_unlock_irqrestore(ap
->lock
, flags
);
5724 ata_port_wait_eh(ap
);
5726 /* Flush hotplug task. The sequence is similar to
5727 * ata_port_flush_task().
5729 flush_workqueue(ata_aux_wq
);
5730 cancel_delayed_work(&ap
->hotplug_task
);
5731 flush_workqueue(ata_aux_wq
);
5734 /* remove the associated SCSI host */
5735 scsi_remove_host(ap
->scsi_host
);
5739 * ata_host_remove - PCI layer callback for device removal
5740 * @host: ATA host set that was removed
5742 * Unregister all objects associated with this host set. Free those
5746 * Inherited from calling layer (may sleep).
5749 void ata_host_remove(struct ata_host
*host
)
5753 for (i
= 0; i
< host
->n_ports
; i
++)
5754 ata_port_detach(host
->ports
[i
]);
5756 free_irq(host
->irq
, host
);
5758 free_irq(host
->irq2
, host
);
5760 for (i
= 0; i
< host
->n_ports
; i
++) {
5761 struct ata_port
*ap
= host
->ports
[i
];
5763 ata_scsi_release(ap
->scsi_host
);
5765 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5766 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5768 /* FIXME: Add -ac IDE pci mods to remove these special cases */
5769 if (ioaddr
->cmd_addr
== ATA_PRIMARY_CMD
)
5770 release_region(ATA_PRIMARY_CMD
, 8);
5771 else if (ioaddr
->cmd_addr
== ATA_SECONDARY_CMD
)
5772 release_region(ATA_SECONDARY_CMD
, 8);
5775 scsi_host_put(ap
->scsi_host
);
5778 if (host
->ops
->host_stop
)
5779 host
->ops
->host_stop(host
);
5785 * ata_scsi_release - SCSI layer callback hook for host unload
5786 * @shost: libata host to be unloaded
5788 * Performs all duties necessary to shut down a libata port...
5789 * Kill port kthread, disable port, and release resources.
5792 * Inherited from SCSI layer.
5798 int ata_scsi_release(struct Scsi_Host
*shost
)
5800 struct ata_port
*ap
= ata_shost_to_port(shost
);
5804 ap
->ops
->port_disable(ap
);
5805 ap
->ops
->port_stop(ap
);
5811 struct ata_probe_ent
*
5812 ata_probe_ent_alloc(struct device
*dev
, const struct ata_port_info
*port
)
5814 struct ata_probe_ent
*probe_ent
;
5816 probe_ent
= kzalloc(sizeof(*probe_ent
), GFP_KERNEL
);
5818 printk(KERN_ERR DRV_NAME
"(%s): out of memory\n",
5819 kobject_name(&(dev
->kobj
)));
5823 INIT_LIST_HEAD(&probe_ent
->node
);
5824 probe_ent
->dev
= dev
;
5826 probe_ent
->sht
= port
->sht
;
5827 probe_ent
->port_flags
= port
->flags
;
5828 probe_ent
->pio_mask
= port
->pio_mask
;
5829 probe_ent
->mwdma_mask
= port
->mwdma_mask
;
5830 probe_ent
->udma_mask
= port
->udma_mask
;
5831 probe_ent
->port_ops
= port
->port_ops
;
5832 probe_ent
->private_data
= port
->private_data
;
5838 * ata_std_ports - initialize ioaddr with standard port offsets.
5839 * @ioaddr: IO address structure to be initialized
5841 * Utility function which initializes data_addr, error_addr,
5842 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5843 * device_addr, status_addr, and command_addr to standard offsets
5844 * relative to cmd_addr.
5846 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5849 void ata_std_ports(struct ata_ioports
*ioaddr
)
5851 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5852 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5853 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5854 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5855 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5856 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5857 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5858 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5859 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5860 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5866 void ata_pci_host_stop (struct ata_host
*host
)
5868 struct pci_dev
*pdev
= to_pci_dev(host
->dev
);
5870 pci_iounmap(pdev
, host
->mmio_base
);
5874 * ata_pci_remove_one - PCI layer callback for device removal
5875 * @pdev: PCI device that was removed
5877 * PCI layer indicates to libata via this hook that
5878 * hot-unplug or module unload event has occurred.
5879 * Handle this by unregistering all objects associated
5880 * with this PCI device. Free those objects. Then finally
5881 * release PCI resources and disable device.
5884 * Inherited from PCI layer (may sleep).
5887 void ata_pci_remove_one (struct pci_dev
*pdev
)
5889 struct device
*dev
= pci_dev_to_dev(pdev
);
5890 struct ata_host
*host
= dev_get_drvdata(dev
);
5892 ata_host_remove(host
);
5894 pci_release_regions(pdev
);
5895 pci_disable_device(pdev
);
5896 dev_set_drvdata(dev
, NULL
);
5899 /* move to PCI subsystem */
5900 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5902 unsigned long tmp
= 0;
5904 switch (bits
->width
) {
5907 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5913 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5919 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5930 return (tmp
== bits
->val
) ? 1 : 0;
5933 void ata_pci_device_do_suspend(struct pci_dev
*pdev
, pm_message_t mesg
)
5935 pci_save_state(pdev
);
5937 if (mesg
.event
== PM_EVENT_SUSPEND
) {
5938 pci_disable_device(pdev
);
5939 pci_set_power_state(pdev
, PCI_D3hot
);
5943 void ata_pci_device_do_resume(struct pci_dev
*pdev
)
5945 pci_set_power_state(pdev
, PCI_D0
);
5946 pci_restore_state(pdev
);
5947 pci_enable_device(pdev
);
5948 pci_set_master(pdev
);
5951 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t mesg
)
5953 struct ata_host
*host
= dev_get_drvdata(&pdev
->dev
);
5956 rc
= ata_host_suspend(host
, mesg
);
5960 ata_pci_device_do_suspend(pdev
, mesg
);
5965 int ata_pci_device_resume(struct pci_dev
*pdev
)
5967 struct ata_host
*host
= dev_get_drvdata(&pdev
->dev
);
5969 ata_pci_device_do_resume(pdev
);
5970 ata_host_resume(host
);
5973 #endif /* CONFIG_PCI */
5976 static int __init
ata_init(void)
5978 ata_probe_timeout
*= HZ
;
5979 ata_wq
= create_workqueue("ata");
5983 ata_aux_wq
= create_singlethread_workqueue("ata_aux");
5985 destroy_workqueue(ata_wq
);
5989 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5993 static void __exit
ata_exit(void)
5995 destroy_workqueue(ata_wq
);
5996 destroy_workqueue(ata_aux_wq
);
5999 subsys_initcall(ata_init
);
6000 module_exit(ata_exit
);
6002 static unsigned long ratelimit_time
;
6003 static DEFINE_SPINLOCK(ata_ratelimit_lock
);
6005 int ata_ratelimit(void)
6008 unsigned long flags
;
6010 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
6012 if (time_after(jiffies
, ratelimit_time
)) {
6014 ratelimit_time
= jiffies
+ (HZ
/5);
6018 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
6024 * ata_wait_register - wait until register value changes
6025 * @reg: IO-mapped register
6026 * @mask: Mask to apply to read register value
6027 * @val: Wait condition
6028 * @interval_msec: polling interval in milliseconds
6029 * @timeout_msec: timeout in milliseconds
6031 * Waiting for some bits of register to change is a common
6032 * operation for ATA controllers. This function reads 32bit LE
6033 * IO-mapped register @reg and tests for the following condition.
6035 * (*@reg & mask) != val
6037 * If the condition is met, it returns; otherwise, the process is
6038 * repeated after @interval_msec until timeout.
6041 * Kernel thread context (may sleep)
6044 * The final register value.
6046 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
6047 unsigned long interval_msec
,
6048 unsigned long timeout_msec
)
6050 unsigned long timeout
;
6053 tmp
= ioread32(reg
);
6055 /* Calculate timeout _after_ the first read to make sure
6056 * preceding writes reach the controller before starting to
6057 * eat away the timeout.
6059 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
6061 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
6062 msleep(interval_msec
);
6063 tmp
= ioread32(reg
);
6072 static void ata_dummy_noret(struct ata_port
*ap
) { }
6073 static int ata_dummy_ret0(struct ata_port
*ap
) { return 0; }
6074 static void ata_dummy_qc_noret(struct ata_queued_cmd
*qc
) { }
6076 static u8
ata_dummy_check_status(struct ata_port
*ap
)
6081 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd
*qc
)
6083 return AC_ERR_SYSTEM
;
6086 const struct ata_port_operations ata_dummy_port_ops
= {
6087 .port_disable
= ata_port_disable
,
6088 .check_status
= ata_dummy_check_status
,
6089 .check_altstatus
= ata_dummy_check_status
,
6090 .dev_select
= ata_noop_dev_select
,
6091 .qc_prep
= ata_noop_qc_prep
,
6092 .qc_issue
= ata_dummy_qc_issue
,
6093 .freeze
= ata_dummy_noret
,
6094 .thaw
= ata_dummy_noret
,
6095 .error_handler
= ata_dummy_noret
,
6096 .post_internal_cmd
= ata_dummy_qc_noret
,
6097 .irq_clear
= ata_dummy_noret
,
6098 .port_start
= ata_dummy_ret0
,
6099 .port_stop
= ata_dummy_noret
,
6103 * libata is essentially a library of internal helper functions for
6104 * low-level ATA host controller drivers. As such, the API/ABI is
6105 * likely to change as new drivers are added and updated.
6106 * Do not depend on ABI/API stability.
6109 EXPORT_SYMBOL_GPL(sata_deb_timing_normal
);
6110 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug
);
6111 EXPORT_SYMBOL_GPL(sata_deb_timing_long
);
6112 EXPORT_SYMBOL_GPL(ata_dummy_port_ops
);
6113 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
6114 EXPORT_SYMBOL_GPL(ata_std_ports
);
6115 EXPORT_SYMBOL_GPL(ata_host_init
);
6116 EXPORT_SYMBOL_GPL(ata_device_add
);
6117 EXPORT_SYMBOL_GPL(ata_port_detach
);
6118 EXPORT_SYMBOL_GPL(ata_host_remove
);
6119 EXPORT_SYMBOL_GPL(ata_sg_init
);
6120 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
6121 EXPORT_SYMBOL_GPL(ata_hsm_move
);
6122 EXPORT_SYMBOL_GPL(ata_qc_complete
);
6123 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple
);
6124 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
6125 EXPORT_SYMBOL_GPL(ata_tf_load
);
6126 EXPORT_SYMBOL_GPL(ata_tf_read
);
6127 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
6128 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
6129 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
6130 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
6131 EXPORT_SYMBOL_GPL(ata_check_status
);
6132 EXPORT_SYMBOL_GPL(ata_altstatus
);
6133 EXPORT_SYMBOL_GPL(ata_exec_command
);
6134 EXPORT_SYMBOL_GPL(ata_port_start
);
6135 EXPORT_SYMBOL_GPL(ata_port_stop
);
6136 EXPORT_SYMBOL_GPL(ata_host_stop
);
6137 EXPORT_SYMBOL_GPL(ata_interrupt
);
6138 EXPORT_SYMBOL_GPL(ata_mmio_data_xfer
);
6139 EXPORT_SYMBOL_GPL(ata_pio_data_xfer
);
6140 EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq
);
6141 EXPORT_SYMBOL_GPL(ata_qc_prep
);
6142 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
6143 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
6144 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
6145 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
6146 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
6147 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
6148 EXPORT_SYMBOL_GPL(ata_bmdma_freeze
);
6149 EXPORT_SYMBOL_GPL(ata_bmdma_thaw
);
6150 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh
);
6151 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler
);
6152 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd
);
6153 EXPORT_SYMBOL_GPL(ata_port_probe
);
6154 EXPORT_SYMBOL_GPL(sata_set_spd
);
6155 EXPORT_SYMBOL_GPL(sata_phy_debounce
);
6156 EXPORT_SYMBOL_GPL(sata_phy_resume
);
6157 EXPORT_SYMBOL_GPL(sata_phy_reset
);
6158 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
6159 EXPORT_SYMBOL_GPL(ata_bus_reset
);
6160 EXPORT_SYMBOL_GPL(ata_std_prereset
);
6161 EXPORT_SYMBOL_GPL(ata_std_softreset
);
6162 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
6163 EXPORT_SYMBOL_GPL(ata_std_postreset
);
6164 EXPORT_SYMBOL_GPL(ata_dev_classify
);
6165 EXPORT_SYMBOL_GPL(ata_dev_pair
);
6166 EXPORT_SYMBOL_GPL(ata_port_disable
);
6167 EXPORT_SYMBOL_GPL(ata_ratelimit
);
6168 EXPORT_SYMBOL_GPL(ata_wait_register
);
6169 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
6170 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
6171 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
6172 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
6173 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
6174 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy
);
6175 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth
);
6176 EXPORT_SYMBOL_GPL(ata_scsi_release
);
6177 EXPORT_SYMBOL_GPL(ata_host_intr
);
6178 EXPORT_SYMBOL_GPL(sata_scr_valid
);
6179 EXPORT_SYMBOL_GPL(sata_scr_read
);
6180 EXPORT_SYMBOL_GPL(sata_scr_write
);
6181 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
6182 EXPORT_SYMBOL_GPL(ata_port_online
);
6183 EXPORT_SYMBOL_GPL(ata_port_offline
);
6184 EXPORT_SYMBOL_GPL(ata_host_suspend
);
6185 EXPORT_SYMBOL_GPL(ata_host_resume
);
6186 EXPORT_SYMBOL_GPL(ata_id_string
);
6187 EXPORT_SYMBOL_GPL(ata_id_c_string
);
6188 EXPORT_SYMBOL_GPL(ata_device_blacklisted
);
6189 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
6191 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
6192 EXPORT_SYMBOL_GPL(ata_timing_compute
);
6193 EXPORT_SYMBOL_GPL(ata_timing_merge
);
6196 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
6197 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
6198 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
6199 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
6200 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
6201 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend
);
6202 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume
);
6203 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
6204 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
6205 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
6206 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
6207 #endif /* CONFIG_PCI */
6209 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
6210 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
6212 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
6213 EXPORT_SYMBOL_GPL(ata_port_schedule_eh
);
6214 EXPORT_SYMBOL_GPL(ata_port_abort
);
6215 EXPORT_SYMBOL_GPL(ata_port_freeze
);
6216 EXPORT_SYMBOL_GPL(ata_eh_freeze_port
);
6217 EXPORT_SYMBOL_GPL(ata_eh_thaw_port
);
6218 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
6219 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
6220 EXPORT_SYMBOL_GPL(ata_do_eh
);