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 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
875 /* But wait.. there's more. Design your standards by
876 * committee and you too can get a free iordy field to
877 * process. However its the speeds not the modes that
878 * are supported... Note drivers using the timing API
879 * will get this right anyway
883 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
885 if (ata_id_is_cfa(id
)) {
887 * Process compact flash extended modes
889 int pio
= id
[163] & 0x7;
890 int dma
= (id
[163] >> 3) & 7;
893 pio_mask
|= (1 << 5);
895 pio_mask
|= (1 << 6);
897 mwdma_mask
|= (1 << 3);
899 mwdma_mask
|= (1 << 4);
903 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
904 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
906 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
910 * ata_port_queue_task - Queue port_task
911 * @ap: The ata_port to queue port_task for
912 * @fn: workqueue function to be scheduled
913 * @data: data value to pass to workqueue function
914 * @delay: delay time for workqueue function
916 * Schedule @fn(@data) for execution after @delay jiffies using
917 * port_task. There is one port_task per port and it's the
918 * user(low level driver)'s responsibility to make sure that only
919 * one task is active at any given time.
921 * libata core layer takes care of synchronization between
922 * port_task and EH. ata_port_queue_task() may be ignored for EH
926 * Inherited from caller.
928 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
933 if (ap
->pflags
& ATA_PFLAG_FLUSH_PORT_TASK
)
936 PREPARE_WORK(&ap
->port_task
, fn
, data
);
939 rc
= queue_work(ata_wq
, &ap
->port_task
);
941 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
943 /* rc == 0 means that another user is using port task */
948 * ata_port_flush_task - Flush port_task
949 * @ap: The ata_port to flush port_task for
951 * After this function completes, port_task is guranteed not to
952 * be running or scheduled.
955 * Kernel thread context (may sleep)
957 void ata_port_flush_task(struct ata_port
*ap
)
963 spin_lock_irqsave(ap
->lock
, flags
);
964 ap
->pflags
|= ATA_PFLAG_FLUSH_PORT_TASK
;
965 spin_unlock_irqrestore(ap
->lock
, flags
);
967 DPRINTK("flush #1\n");
968 flush_workqueue(ata_wq
);
971 * At this point, if a task is running, it's guaranteed to see
972 * the FLUSH flag; thus, it will never queue pio tasks again.
975 if (!cancel_delayed_work(&ap
->port_task
)) {
977 ata_port_printk(ap
, KERN_DEBUG
, "%s: flush #2\n",
979 flush_workqueue(ata_wq
);
982 spin_lock_irqsave(ap
->lock
, flags
);
983 ap
->pflags
&= ~ATA_PFLAG_FLUSH_PORT_TASK
;
984 spin_unlock_irqrestore(ap
->lock
, flags
);
987 ata_port_printk(ap
, KERN_DEBUG
, "%s: EXIT\n", __FUNCTION__
);
990 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
992 struct completion
*waiting
= qc
->private_data
;
998 * ata_exec_internal - execute libata internal command
999 * @dev: Device to which the command is sent
1000 * @tf: Taskfile registers for the command and the result
1001 * @cdb: CDB for packet command
1002 * @dma_dir: Data tranfer direction of the command
1003 * @buf: Data buffer of the command
1004 * @buflen: Length of data buffer
1006 * Executes libata internal command with timeout. @tf contains
1007 * command on entry and result on return. Timeout and error
1008 * conditions are reported via return value. No recovery action
1009 * is taken after a command times out. It's caller's duty to
1010 * clean up after timeout.
1013 * None. Should be called with kernel context, might sleep.
1016 * Zero on success, AC_ERR_* mask on failure
1018 unsigned ata_exec_internal(struct ata_device
*dev
,
1019 struct ata_taskfile
*tf
, const u8
*cdb
,
1020 int dma_dir
, void *buf
, unsigned int buflen
)
1022 struct ata_port
*ap
= dev
->ap
;
1023 u8 command
= tf
->command
;
1024 struct ata_queued_cmd
*qc
;
1025 unsigned int tag
, preempted_tag
;
1026 u32 preempted_sactive
, preempted_qc_active
;
1027 DECLARE_COMPLETION_ONSTACK(wait
);
1028 unsigned long flags
;
1029 unsigned int err_mask
;
1032 spin_lock_irqsave(ap
->lock
, flags
);
1034 /* no internal command while frozen */
1035 if (ap
->pflags
& ATA_PFLAG_FROZEN
) {
1036 spin_unlock_irqrestore(ap
->lock
, flags
);
1037 return AC_ERR_SYSTEM
;
1040 /* initialize internal qc */
1042 /* XXX: Tag 0 is used for drivers with legacy EH as some
1043 * drivers choke if any other tag is given. This breaks
1044 * ata_tag_internal() test for those drivers. Don't use new
1045 * EH stuff without converting to it.
1047 if (ap
->ops
->error_handler
)
1048 tag
= ATA_TAG_INTERNAL
;
1052 if (test_and_set_bit(tag
, &ap
->qc_allocated
))
1054 qc
= __ata_qc_from_tag(ap
, tag
);
1062 preempted_tag
= ap
->active_tag
;
1063 preempted_sactive
= ap
->sactive
;
1064 preempted_qc_active
= ap
->qc_active
;
1065 ap
->active_tag
= ATA_TAG_POISON
;
1069 /* prepare & issue qc */
1072 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1073 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1074 qc
->dma_dir
= dma_dir
;
1075 if (dma_dir
!= DMA_NONE
) {
1076 ata_sg_init_one(qc
, buf
, buflen
);
1077 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1080 qc
->private_data
= &wait
;
1081 qc
->complete_fn
= ata_qc_complete_internal
;
1085 spin_unlock_irqrestore(ap
->lock
, flags
);
1087 rc
= wait_for_completion_timeout(&wait
, ata_probe_timeout
);
1089 ata_port_flush_task(ap
);
1092 spin_lock_irqsave(ap
->lock
, flags
);
1094 /* We're racing with irq here. If we lose, the
1095 * following test prevents us from completing the qc
1096 * twice. If we win, the port is frozen and will be
1097 * cleaned up by ->post_internal_cmd().
1099 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1100 qc
->err_mask
|= AC_ERR_TIMEOUT
;
1102 if (ap
->ops
->error_handler
)
1103 ata_port_freeze(ap
);
1105 ata_qc_complete(qc
);
1107 if (ata_msg_warn(ap
))
1108 ata_dev_printk(dev
, KERN_WARNING
,
1109 "qc timeout (cmd 0x%x)\n", command
);
1112 spin_unlock_irqrestore(ap
->lock
, flags
);
1115 /* do post_internal_cmd */
1116 if (ap
->ops
->post_internal_cmd
)
1117 ap
->ops
->post_internal_cmd(qc
);
1119 if (qc
->flags
& ATA_QCFLAG_FAILED
&& !qc
->err_mask
) {
1120 if (ata_msg_warn(ap
))
1121 ata_dev_printk(dev
, KERN_WARNING
,
1122 "zero err_mask for failed "
1123 "internal command, assuming AC_ERR_OTHER\n");
1124 qc
->err_mask
|= AC_ERR_OTHER
;
1128 spin_lock_irqsave(ap
->lock
, flags
);
1130 *tf
= qc
->result_tf
;
1131 err_mask
= qc
->err_mask
;
1134 ap
->active_tag
= preempted_tag
;
1135 ap
->sactive
= preempted_sactive
;
1136 ap
->qc_active
= preempted_qc_active
;
1138 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1139 * Until those drivers are fixed, we detect the condition
1140 * here, fail the command with AC_ERR_SYSTEM and reenable the
1143 * Note that this doesn't change any behavior as internal
1144 * command failure results in disabling the device in the
1145 * higher layer for LLDDs without new reset/EH callbacks.
1147 * Kill the following code as soon as those drivers are fixed.
1149 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1150 err_mask
|= AC_ERR_SYSTEM
;
1154 spin_unlock_irqrestore(ap
->lock
, flags
);
1160 * ata_do_simple_cmd - execute simple internal command
1161 * @dev: Device to which the command is sent
1162 * @cmd: Opcode to execute
1164 * Execute a 'simple' command, that only consists of the opcode
1165 * 'cmd' itself, without filling any other registers
1168 * Kernel thread context (may sleep).
1171 * Zero on success, AC_ERR_* mask on failure
1173 unsigned int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
1175 struct ata_taskfile tf
;
1177 ata_tf_init(dev
, &tf
);
1180 tf
.flags
|= ATA_TFLAG_DEVICE
;
1181 tf
.protocol
= ATA_PROT_NODATA
;
1183 return ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
1187 * ata_pio_need_iordy - check if iordy needed
1190 * Check if the current speed of the device requires IORDY. Used
1191 * by various controllers for chip configuration.
1194 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1197 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1204 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1206 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1207 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1208 /* Is the speed faster than the drive allows non IORDY ? */
1210 /* This is cycle times not frequency - watch the logic! */
1211 if (pio
> 240) /* PIO2 is 240nS per cycle */
1220 * ata_dev_read_id - Read ID data from the specified device
1221 * @dev: target device
1222 * @p_class: pointer to class of the target device (may be changed)
1223 * @post_reset: is this read ID post-reset?
1224 * @id: buffer to read IDENTIFY data into
1226 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1227 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1228 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1229 * for pre-ATA4 drives.
1232 * Kernel thread context (may sleep)
1235 * 0 on success, -errno otherwise.
1237 int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1238 int post_reset
, u16
*id
)
1240 struct ata_port
*ap
= dev
->ap
;
1241 unsigned int class = *p_class
;
1242 struct ata_taskfile tf
;
1243 unsigned int err_mask
= 0;
1247 if (ata_msg_ctl(ap
))
1248 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1249 __FUNCTION__
, ap
->id
, dev
->devno
);
1251 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1254 ata_tf_init(dev
, &tf
);
1258 tf
.command
= ATA_CMD_ID_ATA
;
1261 tf
.command
= ATA_CMD_ID_ATAPI
;
1265 reason
= "unsupported class";
1269 tf
.protocol
= ATA_PROT_PIO
;
1271 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1272 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1275 reason
= "I/O error";
1279 swap_buf_le16(id
, ATA_ID_WORDS
);
1283 reason
= "device reports illegal type";
1285 if (class == ATA_DEV_ATA
) {
1286 if (!ata_id_is_ata(id
) && !ata_id_is_cfa(id
))
1289 if (ata_id_is_ata(id
))
1293 if (post_reset
&& class == ATA_DEV_ATA
) {
1295 * The exact sequence expected by certain pre-ATA4 drives is:
1298 * INITIALIZE DEVICE PARAMETERS
1300 * Some drives were very specific about that exact sequence.
1302 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1303 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1306 reason
= "INIT_DEV_PARAMS failed";
1310 /* current CHS translation info (id[53-58]) might be
1311 * changed. reread the identify device info.
1323 if (ata_msg_warn(ap
))
1324 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1325 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1329 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1331 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1334 static void ata_dev_config_ncq(struct ata_device
*dev
,
1335 char *desc
, size_t desc_sz
)
1337 struct ata_port
*ap
= dev
->ap
;
1338 int hdepth
= 0, ddepth
= ata_id_queue_depth(dev
->id
);
1340 if (!ata_id_has_ncq(dev
->id
)) {
1345 if (ap
->flags
& ATA_FLAG_NCQ
) {
1346 hdepth
= min(ap
->scsi_host
->can_queue
, ATA_MAX_QUEUE
- 1);
1347 dev
->flags
|= ATA_DFLAG_NCQ
;
1350 if (hdepth
>= ddepth
)
1351 snprintf(desc
, desc_sz
, "NCQ (depth %d)", ddepth
);
1353 snprintf(desc
, desc_sz
, "NCQ (depth %d/%d)", hdepth
, ddepth
);
1356 static void ata_set_port_max_cmd_len(struct ata_port
*ap
)
1360 if (ap
->scsi_host
) {
1361 unsigned int len
= 0;
1363 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1364 len
= max(len
, ap
->device
[i
].cdb_len
);
1366 ap
->scsi_host
->max_cmd_len
= len
;
1371 * ata_dev_configure - Configure the specified ATA/ATAPI device
1372 * @dev: Target device to configure
1373 * @print_info: Enable device info printout
1375 * Configure @dev according to @dev->id. Generic and low-level
1376 * driver specific fixups are also applied.
1379 * Kernel thread context (may sleep)
1382 * 0 on success, -errno otherwise
1384 int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1386 struct ata_port
*ap
= dev
->ap
;
1387 const u16
*id
= dev
->id
;
1388 unsigned int xfer_mask
;
1389 char revbuf
[7]; /* XYZ-99\0 */
1392 if (!ata_dev_enabled(dev
) && ata_msg_info(ap
)) {
1393 ata_dev_printk(dev
, KERN_INFO
,
1394 "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
1395 __FUNCTION__
, ap
->id
, dev
->devno
);
1399 if (ata_msg_probe(ap
))
1400 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1401 __FUNCTION__
, ap
->id
, dev
->devno
);
1403 /* print device capabilities */
1404 if (ata_msg_probe(ap
))
1405 ata_dev_printk(dev
, KERN_DEBUG
,
1406 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
1407 "85:%04x 86:%04x 87:%04x 88:%04x\n",
1409 id
[49], id
[82], id
[83], id
[84],
1410 id
[85], id
[86], id
[87], id
[88]);
1412 /* initialize to-be-configured parameters */
1413 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1414 dev
->max_sectors
= 0;
1422 * common ATA, ATAPI feature tests
1425 /* find max transfer mode; for printk only */
1426 xfer_mask
= ata_id_xfermask(id
);
1428 if (ata_msg_probe(ap
))
1431 /* ATA-specific feature tests */
1432 if (dev
->class == ATA_DEV_ATA
) {
1433 if (ata_id_is_cfa(id
)) {
1434 if (id
[162] & 1) /* CPRM may make this media unusable */
1435 ata_dev_printk(dev
, KERN_WARNING
, "ata%u: device %u supports DRM functions and may not be fully accessable.\n",
1436 ap
->id
, dev
->devno
);
1437 snprintf(revbuf
, 7, "CFA");
1440 snprintf(revbuf
, 7, "ATA-%d", ata_id_major_version(id
));
1442 dev
->n_sectors
= ata_id_n_sectors(id
);
1444 if (ata_id_has_lba(id
)) {
1445 const char *lba_desc
;
1449 dev
->flags
|= ATA_DFLAG_LBA
;
1450 if (ata_id_has_lba48(id
)) {
1451 dev
->flags
|= ATA_DFLAG_LBA48
;
1456 ata_dev_config_ncq(dev
, ncq_desc
, sizeof(ncq_desc
));
1458 /* print device info to dmesg */
1459 if (ata_msg_drv(ap
) && print_info
)
1460 ata_dev_printk(dev
, KERN_INFO
, "%s, "
1461 "max %s, %Lu sectors: %s %s\n",
1463 ata_mode_string(xfer_mask
),
1464 (unsigned long long)dev
->n_sectors
,
1465 lba_desc
, ncq_desc
);
1469 /* Default translation */
1470 dev
->cylinders
= id
[1];
1472 dev
->sectors
= id
[6];
1474 if (ata_id_current_chs_valid(id
)) {
1475 /* Current CHS translation is valid. */
1476 dev
->cylinders
= id
[54];
1477 dev
->heads
= id
[55];
1478 dev
->sectors
= id
[56];
1481 /* print device info to dmesg */
1482 if (ata_msg_drv(ap
) && print_info
)
1483 ata_dev_printk(dev
, KERN_INFO
, "%s, "
1484 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1486 ata_mode_string(xfer_mask
),
1487 (unsigned long long)dev
->n_sectors
,
1488 dev
->cylinders
, dev
->heads
,
1492 if (dev
->id
[59] & 0x100) {
1493 dev
->multi_count
= dev
->id
[59] & 0xff;
1494 if (ata_msg_drv(ap
) && print_info
)
1495 ata_dev_printk(dev
, KERN_INFO
,
1496 "ata%u: dev %u multi count %u\n",
1497 ap
->id
, dev
->devno
, dev
->multi_count
);
1503 /* ATAPI-specific feature tests */
1504 else if (dev
->class == ATA_DEV_ATAPI
) {
1505 char *cdb_intr_string
= "";
1507 rc
= atapi_cdb_len(id
);
1508 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1509 if (ata_msg_warn(ap
))
1510 ata_dev_printk(dev
, KERN_WARNING
,
1511 "unsupported CDB len\n");
1515 dev
->cdb_len
= (unsigned int) rc
;
1517 if (ata_id_cdb_intr(dev
->id
)) {
1518 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1519 cdb_intr_string
= ", CDB intr";
1522 /* print device info to dmesg */
1523 if (ata_msg_drv(ap
) && print_info
)
1524 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s%s\n",
1525 ata_mode_string(xfer_mask
),
1529 if (dev
->horkage
& ATA_HORKAGE_DIAGNOSTIC
) {
1530 /* Let the user know. We don't want to disallow opens for
1531 rescue purposes, or in case the vendor is just a blithering
1534 ata_dev_printk(dev
, KERN_WARNING
,
1535 "Drive reports diagnostics failure. This may indicate a drive\n");
1536 ata_dev_printk(dev
, KERN_WARNING
,
1537 "fault or invalid emulation. Contact drive vendor for information.\n");
1541 ata_set_port_max_cmd_len(ap
);
1543 /* limit bridge transfers to udma5, 200 sectors */
1544 if (ata_dev_knobble(dev
)) {
1545 if (ata_msg_drv(ap
) && print_info
)
1546 ata_dev_printk(dev
, KERN_INFO
,
1547 "applying bridge limits\n");
1548 dev
->udma_mask
&= ATA_UDMA5
;
1549 dev
->max_sectors
= ATA_MAX_SECTORS
;
1552 if (ap
->ops
->dev_config
)
1553 ap
->ops
->dev_config(ap
, dev
);
1555 if (ata_msg_probe(ap
))
1556 ata_dev_printk(dev
, KERN_DEBUG
, "%s: EXIT, drv_stat = 0x%x\n",
1557 __FUNCTION__
, ata_chk_status(ap
));
1561 if (ata_msg_probe(ap
))
1562 ata_dev_printk(dev
, KERN_DEBUG
,
1563 "%s: EXIT, err\n", __FUNCTION__
);
1568 * ata_bus_probe - Reset and probe ATA bus
1571 * Master ATA bus probing function. Initiates a hardware-dependent
1572 * bus reset, then attempts to identify any devices found on
1576 * PCI/etc. bus probe sem.
1579 * Zero on success, negative errno otherwise.
1582 int ata_bus_probe(struct ata_port
*ap
)
1584 unsigned int classes
[ATA_MAX_DEVICES
];
1585 int tries
[ATA_MAX_DEVICES
];
1586 int i
, rc
, down_xfermask
;
1587 struct ata_device
*dev
;
1591 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1592 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1597 /* reset and determine device classes */
1598 ap
->ops
->phy_reset(ap
);
1600 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1601 dev
= &ap
->device
[i
];
1603 if (!(ap
->flags
& ATA_FLAG_DISABLED
) &&
1604 dev
->class != ATA_DEV_UNKNOWN
)
1605 classes
[dev
->devno
] = dev
->class;
1607 classes
[dev
->devno
] = ATA_DEV_NONE
;
1609 dev
->class = ATA_DEV_UNKNOWN
;
1614 /* after the reset the device state is PIO 0 and the controller
1615 state is undefined. Record the mode */
1617 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1618 ap
->device
[i
].pio_mode
= XFER_PIO_0
;
1620 /* read IDENTIFY page and configure devices */
1621 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1622 dev
= &ap
->device
[i
];
1625 dev
->class = classes
[i
];
1627 if (!ata_dev_enabled(dev
))
1630 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1634 rc
= ata_dev_configure(dev
, 1);
1639 /* configure transfer mode */
1640 rc
= ata_set_mode(ap
, &dev
);
1646 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1647 if (ata_dev_enabled(&ap
->device
[i
]))
1650 /* no device present, disable port */
1651 ata_port_disable(ap
);
1652 ap
->ops
->port_disable(ap
);
1659 tries
[dev
->devno
] = 0;
1662 sata_down_spd_limit(ap
);
1665 tries
[dev
->devno
]--;
1666 if (down_xfermask
&&
1667 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1668 tries
[dev
->devno
] = 0;
1671 if (!tries
[dev
->devno
]) {
1672 ata_down_xfermask_limit(dev
, 1);
1673 ata_dev_disable(dev
);
1680 * ata_port_probe - Mark port as enabled
1681 * @ap: Port for which we indicate enablement
1683 * Modify @ap data structure such that the system
1684 * thinks that the entire port is enabled.
1686 * LOCKING: host lock, or some other form of
1690 void ata_port_probe(struct ata_port
*ap
)
1692 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1696 * sata_print_link_status - Print SATA link status
1697 * @ap: SATA port to printk link status about
1699 * This function prints link speed and status of a SATA link.
1704 static void sata_print_link_status(struct ata_port
*ap
)
1706 u32 sstatus
, scontrol
, tmp
;
1708 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1710 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1712 if (ata_port_online(ap
)) {
1713 tmp
= (sstatus
>> 4) & 0xf;
1714 ata_port_printk(ap
, KERN_INFO
,
1715 "SATA link up %s (SStatus %X SControl %X)\n",
1716 sata_spd_string(tmp
), sstatus
, scontrol
);
1718 ata_port_printk(ap
, KERN_INFO
,
1719 "SATA link down (SStatus %X SControl %X)\n",
1725 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1726 * @ap: SATA port associated with target SATA PHY.
1728 * This function issues commands to standard SATA Sxxx
1729 * PHY registers, to wake up the phy (and device), and
1730 * clear any reset condition.
1733 * PCI/etc. bus probe sem.
1736 void __sata_phy_reset(struct ata_port
*ap
)
1739 unsigned long timeout
= jiffies
+ (HZ
* 5);
1741 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1742 /* issue phy wake/reset */
1743 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1744 /* Couldn't find anything in SATA I/II specs, but
1745 * AHCI-1.1 10.4.2 says at least 1 ms. */
1748 /* phy wake/clear reset */
1749 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1751 /* wait for phy to become ready, if necessary */
1754 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1755 if ((sstatus
& 0xf) != 1)
1757 } while (time_before(jiffies
, timeout
));
1759 /* print link status */
1760 sata_print_link_status(ap
);
1762 /* TODO: phy layer with polling, timeouts, etc. */
1763 if (!ata_port_offline(ap
))
1766 ata_port_disable(ap
);
1768 if (ap
->flags
& ATA_FLAG_DISABLED
)
1771 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1772 ata_port_disable(ap
);
1776 ap
->cbl
= ATA_CBL_SATA
;
1780 * sata_phy_reset - Reset SATA bus.
1781 * @ap: SATA port associated with target SATA PHY.
1783 * This function resets the SATA bus, and then probes
1784 * the bus for devices.
1787 * PCI/etc. bus probe sem.
1790 void sata_phy_reset(struct ata_port
*ap
)
1792 __sata_phy_reset(ap
);
1793 if (ap
->flags
& ATA_FLAG_DISABLED
)
1799 * ata_dev_pair - return other device on cable
1802 * Obtain the other device on the same cable, or if none is
1803 * present NULL is returned
1806 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1808 struct ata_port
*ap
= adev
->ap
;
1809 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1810 if (!ata_dev_enabled(pair
))
1816 * ata_port_disable - Disable port.
1817 * @ap: Port to be disabled.
1819 * Modify @ap data structure such that the system
1820 * thinks that the entire port is disabled, and should
1821 * never attempt to probe or communicate with devices
1824 * LOCKING: host lock, or some other form of
1828 void ata_port_disable(struct ata_port
*ap
)
1830 ap
->device
[0].class = ATA_DEV_NONE
;
1831 ap
->device
[1].class = ATA_DEV_NONE
;
1832 ap
->flags
|= ATA_FLAG_DISABLED
;
1836 * sata_down_spd_limit - adjust SATA spd limit downward
1837 * @ap: Port to adjust SATA spd limit for
1839 * Adjust SATA spd limit of @ap downward. Note that this
1840 * function only adjusts the limit. The change must be applied
1841 * using sata_set_spd().
1844 * Inherited from caller.
1847 * 0 on success, negative errno on failure
1849 int sata_down_spd_limit(struct ata_port
*ap
)
1851 u32 sstatus
, spd
, mask
;
1854 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1858 mask
= ap
->sata_spd_limit
;
1861 highbit
= fls(mask
) - 1;
1862 mask
&= ~(1 << highbit
);
1864 spd
= (sstatus
>> 4) & 0xf;
1868 mask
&= (1 << spd
) - 1;
1872 ap
->sata_spd_limit
= mask
;
1874 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1875 sata_spd_string(fls(mask
)));
1880 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1884 if (ap
->sata_spd_limit
== UINT_MAX
)
1887 limit
= fls(ap
->sata_spd_limit
);
1889 spd
= (*scontrol
>> 4) & 0xf;
1890 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1892 return spd
!= limit
;
1896 * sata_set_spd_needed - is SATA spd configuration needed
1897 * @ap: Port in question
1899 * Test whether the spd limit in SControl matches
1900 * @ap->sata_spd_limit. This function is used to determine
1901 * whether hardreset is necessary to apply SATA spd
1905 * Inherited from caller.
1908 * 1 if SATA spd configuration is needed, 0 otherwise.
1910 int sata_set_spd_needed(struct ata_port
*ap
)
1914 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1917 return __sata_set_spd_needed(ap
, &scontrol
);
1921 * sata_set_spd - set SATA spd according to spd limit
1922 * @ap: Port to set SATA spd for
1924 * Set SATA spd of @ap according to sata_spd_limit.
1927 * Inherited from caller.
1930 * 0 if spd doesn't need to be changed, 1 if spd has been
1931 * changed. Negative errno if SCR registers are inaccessible.
1933 int sata_set_spd(struct ata_port
*ap
)
1938 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1941 if (!__sata_set_spd_needed(ap
, &scontrol
))
1944 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1951 * This mode timing computation functionality is ported over from
1952 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1955 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1956 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1957 * for UDMA6, which is currently supported only by Maxtor drives.
1959 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
1962 static const struct ata_timing ata_timing
[] = {
1964 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1965 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1966 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1967 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1969 { XFER_MW_DMA_4
, 25, 0, 0, 0, 55, 20, 80, 0 },
1970 { XFER_MW_DMA_3
, 25, 0, 0, 0, 65, 25, 100, 0 },
1971 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1972 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1973 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1975 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1977 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1978 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1979 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1981 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1982 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1983 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1985 { XFER_PIO_6
, 10, 55, 20, 80, 55, 20, 80, 0 },
1986 { XFER_PIO_5
, 15, 65, 25, 100, 65, 25, 100, 0 },
1987 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1988 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1990 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1991 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1992 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1994 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1999 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
2000 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
2002 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
2004 q
->setup
= EZ(t
->setup
* 1000, T
);
2005 q
->act8b
= EZ(t
->act8b
* 1000, T
);
2006 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
2007 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
2008 q
->active
= EZ(t
->active
* 1000, T
);
2009 q
->recover
= EZ(t
->recover
* 1000, T
);
2010 q
->cycle
= EZ(t
->cycle
* 1000, T
);
2011 q
->udma
= EZ(t
->udma
* 1000, UT
);
2014 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
2015 struct ata_timing
*m
, unsigned int what
)
2017 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
2018 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
2019 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
2020 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
2021 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
2022 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
2023 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
2024 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
2027 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
2029 const struct ata_timing
*t
;
2031 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
2032 if (t
->mode
== 0xFF)
2037 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
2038 struct ata_timing
*t
, int T
, int UT
)
2040 const struct ata_timing
*s
;
2041 struct ata_timing p
;
2047 if (!(s
= ata_timing_find_mode(speed
)))
2050 memcpy(t
, s
, sizeof(*s
));
2053 * If the drive is an EIDE drive, it can tell us it needs extended
2054 * PIO/MW_DMA cycle timing.
2057 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
2058 memset(&p
, 0, sizeof(p
));
2059 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
2060 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
2061 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
2062 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
2063 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
2065 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
2069 * Convert the timing to bus clock counts.
2072 ata_timing_quantize(t
, t
, T
, UT
);
2075 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2076 * S.M.A.R.T * and some other commands. We have to ensure that the
2077 * DMA cycle timing is slower/equal than the fastest PIO timing.
2080 if (speed
> XFER_PIO_4
) {
2081 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
2082 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
2086 * Lengthen active & recovery time so that cycle time is correct.
2089 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
2090 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
2091 t
->rec8b
= t
->cyc8b
- t
->act8b
;
2094 if (t
->active
+ t
->recover
< t
->cycle
) {
2095 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
2096 t
->recover
= t
->cycle
- t
->active
;
2103 * ata_down_xfermask_limit - adjust dev xfer masks downward
2104 * @dev: Device to adjust xfer masks
2105 * @force_pio0: Force PIO0
2107 * Adjust xfer masks of @dev downward. Note that this function
2108 * does not apply the change. Invoking ata_set_mode() afterwards
2109 * will apply the limit.
2112 * Inherited from caller.
2115 * 0 on success, negative errno on failure
2117 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
2119 unsigned long xfer_mask
;
2122 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
2127 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2128 if (xfer_mask
& ATA_MASK_UDMA
)
2129 xfer_mask
&= ~ATA_MASK_MWDMA
;
2131 highbit
= fls(xfer_mask
) - 1;
2132 xfer_mask
&= ~(1 << highbit
);
2134 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
2138 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2141 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
2142 ata_mode_string(xfer_mask
));
2150 static int ata_dev_set_mode(struct ata_device
*dev
)
2152 unsigned int err_mask
;
2155 dev
->flags
&= ~ATA_DFLAG_PIO
;
2156 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
2157 dev
->flags
|= ATA_DFLAG_PIO
;
2159 err_mask
= ata_dev_set_xfermode(dev
);
2161 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
2162 "(err_mask=0x%x)\n", err_mask
);
2166 rc
= ata_dev_revalidate(dev
, 0);
2170 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2171 dev
->xfer_shift
, (int)dev
->xfer_mode
);
2173 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
2174 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
2179 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2180 * @ap: port on which timings will be programmed
2181 * @r_failed_dev: out paramter for failed device
2183 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2184 * ata_set_mode() fails, pointer to the failing device is
2185 * returned in @r_failed_dev.
2188 * PCI/etc. bus probe sem.
2191 * 0 on success, negative errno otherwise
2193 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2195 struct ata_device
*dev
;
2196 int i
, rc
= 0, used_dma
= 0, found
= 0;
2198 /* has private set_mode? */
2199 if (ap
->ops
->set_mode
) {
2200 /* FIXME: make ->set_mode handle no device case and
2201 * return error code and failing device on failure.
2203 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2204 if (ata_dev_ready(&ap
->device
[i
])) {
2205 ap
->ops
->set_mode(ap
);
2212 /* step 1: calculate xfer_mask */
2213 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2214 unsigned int pio_mask
, dma_mask
;
2216 dev
= &ap
->device
[i
];
2218 if (!ata_dev_enabled(dev
))
2221 ata_dev_xfermask(dev
);
2223 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2224 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2225 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2226 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2235 /* step 2: always set host PIO timings */
2236 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2237 dev
= &ap
->device
[i
];
2238 if (!ata_dev_enabled(dev
))
2241 if (!dev
->pio_mode
) {
2242 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2247 dev
->xfer_mode
= dev
->pio_mode
;
2248 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2249 if (ap
->ops
->set_piomode
)
2250 ap
->ops
->set_piomode(ap
, dev
);
2253 /* step 3: set host DMA timings */
2254 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2255 dev
= &ap
->device
[i
];
2257 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2260 dev
->xfer_mode
= dev
->dma_mode
;
2261 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2262 if (ap
->ops
->set_dmamode
)
2263 ap
->ops
->set_dmamode(ap
, dev
);
2266 /* step 4: update devices' xfer mode */
2267 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2268 dev
= &ap
->device
[i
];
2270 /* don't udpate suspended devices' xfer mode */
2271 if (!ata_dev_ready(dev
))
2274 rc
= ata_dev_set_mode(dev
);
2279 /* Record simplex status. If we selected DMA then the other
2280 * host channels are not permitted to do so.
2282 if (used_dma
&& (ap
->host
->flags
& ATA_HOST_SIMPLEX
))
2283 ap
->host
->simplex_claimed
= 1;
2285 /* step5: chip specific finalisation */
2286 if (ap
->ops
->post_set_mode
)
2287 ap
->ops
->post_set_mode(ap
);
2291 *r_failed_dev
= dev
;
2296 * ata_tf_to_host - issue ATA taskfile to host controller
2297 * @ap: port to which command is being issued
2298 * @tf: ATA taskfile register set
2300 * Issues ATA taskfile register set to ATA host controller,
2301 * with proper synchronization with interrupt handler and
2305 * spin_lock_irqsave(host lock)
2308 static inline void ata_tf_to_host(struct ata_port
*ap
,
2309 const struct ata_taskfile
*tf
)
2311 ap
->ops
->tf_load(ap
, tf
);
2312 ap
->ops
->exec_command(ap
, tf
);
2316 * ata_busy_sleep - sleep until BSY clears, or timeout
2317 * @ap: port containing status register to be polled
2318 * @tmout_pat: impatience timeout
2319 * @tmout: overall timeout
2321 * Sleep until ATA Status register bit BSY clears,
2322 * or a timeout occurs.
2327 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2328 unsigned long tmout_pat
, unsigned long tmout
)
2330 unsigned long timer_start
, timeout
;
2333 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2334 timer_start
= jiffies
;
2335 timeout
= timer_start
+ tmout_pat
;
2336 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2338 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2341 if (status
& ATA_BUSY
)
2342 ata_port_printk(ap
, KERN_WARNING
,
2343 "port is slow to respond, please be patient\n");
2345 timeout
= timer_start
+ tmout
;
2346 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2348 status
= ata_chk_status(ap
);
2351 if (status
& ATA_BUSY
) {
2352 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2353 "(%lu secs)\n", tmout
/ HZ
);
2360 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2362 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2363 unsigned int dev0
= devmask
& (1 << 0);
2364 unsigned int dev1
= devmask
& (1 << 1);
2365 unsigned long timeout
;
2367 /* if device 0 was found in ata_devchk, wait for its
2371 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2373 /* if device 1 was found in ata_devchk, wait for
2374 * register access, then wait for BSY to clear
2376 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2380 ap
->ops
->dev_select(ap
, 1);
2381 if (ap
->flags
& ATA_FLAG_MMIO
) {
2382 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2383 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2385 nsect
= inb(ioaddr
->nsect_addr
);
2386 lbal
= inb(ioaddr
->lbal_addr
);
2388 if ((nsect
== 1) && (lbal
== 1))
2390 if (time_after(jiffies
, timeout
)) {
2394 msleep(50); /* give drive a breather */
2397 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2399 /* is all this really necessary? */
2400 ap
->ops
->dev_select(ap
, 0);
2402 ap
->ops
->dev_select(ap
, 1);
2404 ap
->ops
->dev_select(ap
, 0);
2407 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2408 unsigned int devmask
)
2410 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2412 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2414 /* software reset. causes dev0 to be selected */
2415 if (ap
->flags
& ATA_FLAG_MMIO
) {
2416 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2417 udelay(20); /* FIXME: flush */
2418 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2419 udelay(20); /* FIXME: flush */
2420 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2422 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2424 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2426 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2429 /* spec mandates ">= 2ms" before checking status.
2430 * We wait 150ms, because that was the magic delay used for
2431 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2432 * between when the ATA command register is written, and then
2433 * status is checked. Because waiting for "a while" before
2434 * checking status is fine, post SRST, we perform this magic
2435 * delay here as well.
2437 * Old drivers/ide uses the 2mS rule and then waits for ready
2441 /* Before we perform post reset processing we want to see if
2442 * the bus shows 0xFF because the odd clown forgets the D7
2443 * pulldown resistor.
2445 if (ata_check_status(ap
) == 0xFF) {
2446 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2447 return AC_ERR_OTHER
;
2450 ata_bus_post_reset(ap
, devmask
);
2456 * ata_bus_reset - reset host port and associated ATA channel
2457 * @ap: port to reset
2459 * This is typically the first time we actually start issuing
2460 * commands to the ATA channel. We wait for BSY to clear, then
2461 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2462 * result. Determine what devices, if any, are on the channel
2463 * by looking at the device 0/1 error register. Look at the signature
2464 * stored in each device's taskfile registers, to determine if
2465 * the device is ATA or ATAPI.
2468 * PCI/etc. bus probe sem.
2469 * Obtains host lock.
2472 * Sets ATA_FLAG_DISABLED if bus reset fails.
2475 void ata_bus_reset(struct ata_port
*ap
)
2477 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2478 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2480 unsigned int dev0
, dev1
= 0, devmask
= 0;
2482 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2484 /* determine if device 0/1 are present */
2485 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2488 dev0
= ata_devchk(ap
, 0);
2490 dev1
= ata_devchk(ap
, 1);
2494 devmask
|= (1 << 0);
2496 devmask
|= (1 << 1);
2498 /* select device 0 again */
2499 ap
->ops
->dev_select(ap
, 0);
2501 /* issue bus reset */
2502 if (ap
->flags
& ATA_FLAG_SRST
)
2503 if (ata_bus_softreset(ap
, devmask
))
2507 * determine by signature whether we have ATA or ATAPI devices
2509 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2510 if ((slave_possible
) && (err
!= 0x81))
2511 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2513 /* re-enable interrupts */
2514 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2517 /* is double-select really necessary? */
2518 if (ap
->device
[1].class != ATA_DEV_NONE
)
2519 ap
->ops
->dev_select(ap
, 1);
2520 if (ap
->device
[0].class != ATA_DEV_NONE
)
2521 ap
->ops
->dev_select(ap
, 0);
2523 /* if no devices were detected, disable this port */
2524 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2525 (ap
->device
[1].class == ATA_DEV_NONE
))
2528 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2529 /* set up device control for ATA_FLAG_SATA_RESET */
2530 if (ap
->flags
& ATA_FLAG_MMIO
)
2531 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2533 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2540 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2541 ap
->ops
->port_disable(ap
);
2547 * sata_phy_debounce - debounce SATA phy status
2548 * @ap: ATA port to debounce SATA phy status for
2549 * @params: timing parameters { interval, duratinon, timeout } in msec
2551 * Make sure SStatus of @ap reaches stable state, determined by
2552 * holding the same value where DET is not 1 for @duration polled
2553 * every @interval, before @timeout. Timeout constraints the
2554 * beginning of the stable state. Because, after hot unplugging,
2555 * DET gets stuck at 1 on some controllers, this functions waits
2556 * until timeout then returns 0 if DET is stable at 1.
2559 * Kernel thread context (may sleep)
2562 * 0 on success, -errno on failure.
2564 int sata_phy_debounce(struct ata_port
*ap
, const unsigned long *params
)
2566 unsigned long interval_msec
= params
[0];
2567 unsigned long duration
= params
[1] * HZ
/ 1000;
2568 unsigned long timeout
= jiffies
+ params
[2] * HZ
/ 1000;
2569 unsigned long last_jiffies
;
2573 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2578 last_jiffies
= jiffies
;
2581 msleep(interval_msec
);
2582 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2588 if (cur
== 1 && time_before(jiffies
, timeout
))
2590 if (time_after(jiffies
, last_jiffies
+ duration
))
2595 /* unstable, start over */
2597 last_jiffies
= jiffies
;
2600 if (time_after(jiffies
, timeout
))
2606 * sata_phy_resume - resume SATA phy
2607 * @ap: ATA port to resume SATA phy for
2608 * @params: timing parameters { interval, duratinon, timeout } in msec
2610 * Resume SATA phy of @ap and debounce it.
2613 * Kernel thread context (may sleep)
2616 * 0 on success, -errno on failure.
2618 int sata_phy_resume(struct ata_port
*ap
, const unsigned long *params
)
2623 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2626 scontrol
= (scontrol
& 0x0f0) | 0x300;
2628 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2631 /* Some PHYs react badly if SStatus is pounded immediately
2632 * after resuming. Delay 200ms before debouncing.
2636 return sata_phy_debounce(ap
, params
);
2639 static void ata_wait_spinup(struct ata_port
*ap
)
2641 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2642 unsigned long end
, secs
;
2645 /* first, debounce phy if SATA */
2646 if (ap
->cbl
== ATA_CBL_SATA
) {
2647 rc
= sata_phy_debounce(ap
, sata_deb_timing_hotplug
);
2649 /* if debounced successfully and offline, no need to wait */
2650 if ((rc
== 0 || rc
== -EOPNOTSUPP
) && ata_port_offline(ap
))
2654 /* okay, let's give the drive time to spin up */
2655 end
= ehc
->i
.hotplug_timestamp
+ ATA_SPINUP_WAIT
* HZ
/ 1000;
2656 secs
= ((end
- jiffies
) + HZ
- 1) / HZ
;
2658 if (time_after(jiffies
, end
))
2662 ata_port_printk(ap
, KERN_INFO
, "waiting for device to spin up "
2663 "(%lu secs)\n", secs
);
2665 schedule_timeout_uninterruptible(end
- jiffies
);
2669 * ata_std_prereset - prepare for reset
2670 * @ap: ATA port to be reset
2672 * @ap is about to be reset. Initialize it.
2675 * Kernel thread context (may sleep)
2678 * 0 on success, -errno otherwise.
2680 int ata_std_prereset(struct ata_port
*ap
)
2682 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2683 const unsigned long *timing
= sata_ehc_deb_timing(ehc
);
2686 /* handle link resume & hotplug spinup */
2687 if ((ehc
->i
.flags
& ATA_EHI_RESUME_LINK
) &&
2688 (ap
->flags
& ATA_FLAG_HRST_TO_RESUME
))
2689 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2691 if ((ehc
->i
.flags
& ATA_EHI_HOTPLUGGED
) &&
2692 (ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
))
2693 ata_wait_spinup(ap
);
2695 /* if we're about to do hardreset, nothing more to do */
2696 if (ehc
->i
.action
& ATA_EH_HARDRESET
)
2699 /* if SATA, resume phy */
2700 if (ap
->cbl
== ATA_CBL_SATA
) {
2701 rc
= sata_phy_resume(ap
, timing
);
2702 if (rc
&& rc
!= -EOPNOTSUPP
) {
2703 /* phy resume failed */
2704 ata_port_printk(ap
, KERN_WARNING
, "failed to resume "
2705 "link for reset (errno=%d)\n", rc
);
2710 /* Wait for !BSY if the controller can wait for the first D2H
2711 * Reg FIS and we don't know that no device is attached.
2713 if (!(ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
) && !ata_port_offline(ap
))
2714 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2720 * ata_std_softreset - reset host port via ATA SRST
2721 * @ap: port to reset
2722 * @classes: resulting classes of attached devices
2724 * Reset host port using ATA SRST.
2727 * Kernel thread context (may sleep)
2730 * 0 on success, -errno otherwise.
2732 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2734 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2735 unsigned int devmask
= 0, err_mask
;
2740 if (ata_port_offline(ap
)) {
2741 classes
[0] = ATA_DEV_NONE
;
2745 /* determine if device 0/1 are present */
2746 if (ata_devchk(ap
, 0))
2747 devmask
|= (1 << 0);
2748 if (slave_possible
&& ata_devchk(ap
, 1))
2749 devmask
|= (1 << 1);
2751 /* select device 0 again */
2752 ap
->ops
->dev_select(ap
, 0);
2754 /* issue bus reset */
2755 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2756 err_mask
= ata_bus_softreset(ap
, devmask
);
2758 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2763 /* determine by signature whether we have ATA or ATAPI devices */
2764 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2765 if (slave_possible
&& err
!= 0x81)
2766 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2769 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2774 * sata_std_hardreset - reset host port via SATA phy reset
2775 * @ap: port to reset
2776 * @class: resulting class of attached device
2778 * SATA phy-reset host port using DET bits of SControl register.
2781 * Kernel thread context (may sleep)
2784 * 0 on success, -errno otherwise.
2786 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2788 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2789 const unsigned long *timing
= sata_ehc_deb_timing(ehc
);
2795 if (sata_set_spd_needed(ap
)) {
2796 /* SATA spec says nothing about how to reconfigure
2797 * spd. To be on the safe side, turn off phy during
2798 * reconfiguration. This works for at least ICH7 AHCI
2801 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2804 scontrol
= (scontrol
& 0x0f0) | 0x304;
2806 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2812 /* issue phy wake/reset */
2813 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2816 scontrol
= (scontrol
& 0x0f0) | 0x301;
2818 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2821 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2822 * 10.4.2 says at least 1 ms.
2826 /* bring phy back */
2827 sata_phy_resume(ap
, timing
);
2829 /* TODO: phy layer with polling, timeouts, etc. */
2830 if (ata_port_offline(ap
)) {
2831 *class = ATA_DEV_NONE
;
2832 DPRINTK("EXIT, link offline\n");
2836 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2837 ata_port_printk(ap
, KERN_ERR
,
2838 "COMRESET failed (device not ready)\n");
2842 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2844 *class = ata_dev_try_classify(ap
, 0, NULL
);
2846 DPRINTK("EXIT, class=%u\n", *class);
2851 * ata_std_postreset - standard postreset callback
2852 * @ap: the target ata_port
2853 * @classes: classes of attached devices
2855 * This function is invoked after a successful reset. Note that
2856 * the device might have been reset more than once using
2857 * different reset methods before postreset is invoked.
2860 * Kernel thread context (may sleep)
2862 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2868 /* print link status */
2869 sata_print_link_status(ap
);
2872 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2873 sata_scr_write(ap
, SCR_ERROR
, serror
);
2875 /* re-enable interrupts */
2876 if (!ap
->ops
->error_handler
) {
2877 /* FIXME: hack. create a hook instead */
2878 if (ap
->ioaddr
.ctl_addr
)
2882 /* is double-select really necessary? */
2883 if (classes
[0] != ATA_DEV_NONE
)
2884 ap
->ops
->dev_select(ap
, 1);
2885 if (classes
[1] != ATA_DEV_NONE
)
2886 ap
->ops
->dev_select(ap
, 0);
2888 /* bail out if no device is present */
2889 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2890 DPRINTK("EXIT, no device\n");
2894 /* set up device control */
2895 if (ap
->ioaddr
.ctl_addr
) {
2896 if (ap
->flags
& ATA_FLAG_MMIO
)
2897 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2899 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2906 * ata_dev_same_device - Determine whether new ID matches configured device
2907 * @dev: device to compare against
2908 * @new_class: class of the new device
2909 * @new_id: IDENTIFY page of the new device
2911 * Compare @new_class and @new_id against @dev and determine
2912 * whether @dev is the device indicated by @new_class and
2919 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2921 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2924 const u16
*old_id
= dev
->id
;
2925 unsigned char model
[2][41], serial
[2][21];
2928 if (dev
->class != new_class
) {
2929 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2930 dev
->class, new_class
);
2934 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2935 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2936 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2937 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2938 new_n_sectors
= ata_id_n_sectors(new_id
);
2940 if (strcmp(model
[0], model
[1])) {
2941 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2942 "'%s' != '%s'\n", model
[0], model
[1]);
2946 if (strcmp(serial
[0], serial
[1])) {
2947 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2948 "'%s' != '%s'\n", serial
[0], serial
[1]);
2952 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2953 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2955 (unsigned long long)dev
->n_sectors
,
2956 (unsigned long long)new_n_sectors
);
2964 * ata_dev_revalidate - Revalidate ATA device
2965 * @dev: device to revalidate
2966 * @post_reset: is this revalidation after reset?
2968 * Re-read IDENTIFY page and make sure @dev is still attached to
2972 * Kernel thread context (may sleep)
2975 * 0 on success, negative errno otherwise
2977 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2979 unsigned int class = dev
->class;
2980 u16
*id
= (void *)dev
->ap
->sector_buf
;
2983 if (!ata_dev_enabled(dev
)) {
2989 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2993 /* is the device still there? */
2994 if (!ata_dev_same_device(dev
, class, id
)) {
2999 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
3001 /* configure device according to the new ID */
3002 rc
= ata_dev_configure(dev
, 0);
3007 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
3011 static const char * const ata_dma_blacklist
[] = {
3012 "WDC AC11000H", NULL
,
3013 "WDC AC22100H", NULL
,
3014 "WDC AC32500H", NULL
,
3015 "WDC AC33100H", NULL
,
3016 "WDC AC31600H", NULL
,
3017 "WDC AC32100H", "24.09P07",
3018 "WDC AC23200L", "21.10N21",
3019 "Compaq CRD-8241B", NULL
,
3024 "SanDisk SDP3B", NULL
,
3025 "SanDisk SDP3B-64", NULL
,
3026 "SANYO CD-ROM CRD", NULL
,
3027 "HITACHI CDR-8", NULL
,
3028 "HITACHI CDR-8335", NULL
,
3029 "HITACHI CDR-8435", NULL
,
3030 "Toshiba CD-ROM XM-6202B", NULL
,
3031 "TOSHIBA CD-ROM XM-1702BC", NULL
,
3033 "E-IDE CD-ROM CR-840", NULL
,
3034 "CD-ROM Drive/F5A", NULL
,
3035 "WPI CDD-820", NULL
,
3036 "SAMSUNG CD-ROM SC-148C", NULL
,
3037 "SAMSUNG CD-ROM SC", NULL
,
3038 "SanDisk SDP3B-64", NULL
,
3039 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
3040 "_NEC DV5800A", NULL
,
3041 "SAMSUNG CD-ROM SN-124", "N001"
3044 static int ata_strim(char *s
, size_t len
)
3046 len
= strnlen(s
, len
);
3048 /* ATAPI specifies that empty space is blank-filled; remove blanks */
3049 while ((len
> 0) && (s
[len
- 1] == ' ')) {
3056 static int ata_dma_blacklisted(const struct ata_device
*dev
)
3058 unsigned char model_num
[40];
3059 unsigned char model_rev
[16];
3060 unsigned int nlen
, rlen
;
3063 /* We don't support polling DMA.
3064 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
3065 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
3067 if ((dev
->ap
->flags
& ATA_FLAG_PIO_POLLING
) &&
3068 (dev
->flags
& ATA_DFLAG_CDB_INTR
))
3071 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
3073 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
3075 nlen
= ata_strim(model_num
, sizeof(model_num
));
3076 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
3078 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
3079 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
3080 if (ata_dma_blacklist
[i
+1] == NULL
)
3082 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
3090 * ata_dev_xfermask - Compute supported xfermask of the given device
3091 * @dev: Device to compute xfermask for
3093 * Compute supported xfermask of @dev and store it in
3094 * dev->*_mask. This function is responsible for applying all
3095 * known limits including host controller limits, device
3101 static void ata_dev_xfermask(struct ata_device
*dev
)
3103 struct ata_port
*ap
= dev
->ap
;
3104 struct ata_host
*host
= ap
->host
;
3105 unsigned long xfer_mask
;
3107 /* controller modes available */
3108 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
3109 ap
->mwdma_mask
, ap
->udma_mask
);
3111 /* Apply cable rule here. Don't apply it early because when
3112 * we handle hot plug the cable type can itself change.
3114 if (ap
->cbl
== ATA_CBL_PATA40
)
3115 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
3117 xfer_mask
&= ata_pack_xfermask(dev
->pio_mask
,
3118 dev
->mwdma_mask
, dev
->udma_mask
);
3119 xfer_mask
&= ata_id_xfermask(dev
->id
);
3122 * CFA Advanced TrueIDE timings are not allowed on a shared
3125 if (ata_dev_pair(dev
)) {
3126 /* No PIO5 or PIO6 */
3127 xfer_mask
&= ~(0x03 << (ATA_SHIFT_PIO
+ 5));
3128 /* No MWDMA3 or MWDMA 4 */
3129 xfer_mask
&= ~(0x03 << (ATA_SHIFT_MWDMA
+ 3));
3132 if (ata_dma_blacklisted(dev
)) {
3133 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3134 ata_dev_printk(dev
, KERN_WARNING
,
3135 "device is on DMA blacklist, disabling DMA\n");
3138 if ((host
->flags
& ATA_HOST_SIMPLEX
) && host
->simplex_claimed
) {
3139 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3140 ata_dev_printk(dev
, KERN_WARNING
, "simplex DMA is claimed by "
3141 "other device, disabling DMA\n");
3144 if (ap
->ops
->mode_filter
)
3145 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
3147 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
3148 &dev
->mwdma_mask
, &dev
->udma_mask
);
3152 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3153 * @dev: Device to which command will be sent
3155 * Issue SET FEATURES - XFER MODE command to device @dev
3159 * PCI/etc. bus probe sem.
3162 * 0 on success, AC_ERR_* mask otherwise.
3165 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3167 struct ata_taskfile tf
;
3168 unsigned int err_mask
;
3170 /* set up set-features taskfile */
3171 DPRINTK("set features - xfer mode\n");
3173 ata_tf_init(dev
, &tf
);
3174 tf
.command
= ATA_CMD_SET_FEATURES
;
3175 tf
.feature
= SETFEATURES_XFER
;
3176 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3177 tf
.protocol
= ATA_PROT_NODATA
;
3178 tf
.nsect
= dev
->xfer_mode
;
3180 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3182 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3187 * ata_dev_init_params - Issue INIT DEV PARAMS command
3188 * @dev: Device to which command will be sent
3189 * @heads: Number of heads (taskfile parameter)
3190 * @sectors: Number of sectors (taskfile parameter)
3193 * Kernel thread context (may sleep)
3196 * 0 on success, AC_ERR_* mask otherwise.
3198 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3199 u16 heads
, u16 sectors
)
3201 struct ata_taskfile tf
;
3202 unsigned int err_mask
;
3204 /* Number of sectors per track 1-255. Number of heads 1-16 */
3205 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3206 return AC_ERR_INVALID
;
3208 /* set up init dev params taskfile */
3209 DPRINTK("init dev params \n");
3211 ata_tf_init(dev
, &tf
);
3212 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3213 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3214 tf
.protocol
= ATA_PROT_NODATA
;
3216 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3218 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3220 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3225 * ata_sg_clean - Unmap DMA memory associated with command
3226 * @qc: Command containing DMA memory to be released
3228 * Unmap all mapped DMA memory associated with this command.
3231 * spin_lock_irqsave(host lock)
3234 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3236 struct ata_port
*ap
= qc
->ap
;
3237 struct scatterlist
*sg
= qc
->__sg
;
3238 int dir
= qc
->dma_dir
;
3239 void *pad_buf
= NULL
;
3241 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3242 WARN_ON(sg
== NULL
);
3244 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3245 WARN_ON(qc
->n_elem
> 1);
3247 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3249 /* if we padded the buffer out to 32-bit bound, and data
3250 * xfer direction is from-device, we must copy from the
3251 * pad buffer back into the supplied buffer
3253 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3254 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3256 if (qc
->flags
& ATA_QCFLAG_SG
) {
3258 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3259 /* restore last sg */
3260 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3262 struct scatterlist
*psg
= &qc
->pad_sgent
;
3263 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3264 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3265 kunmap_atomic(addr
, KM_IRQ0
);
3269 dma_unmap_single(ap
->dev
,
3270 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3273 sg
->length
+= qc
->pad_len
;
3275 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3276 pad_buf
, qc
->pad_len
);
3279 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3284 * ata_fill_sg - Fill PCI IDE PRD table
3285 * @qc: Metadata associated with taskfile to be transferred
3287 * Fill PCI IDE PRD (scatter-gather) table with segments
3288 * associated with the current disk command.
3291 * spin_lock_irqsave(host lock)
3294 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3296 struct ata_port
*ap
= qc
->ap
;
3297 struct scatterlist
*sg
;
3300 WARN_ON(qc
->__sg
== NULL
);
3301 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3304 ata_for_each_sg(sg
, qc
) {
3308 /* determine if physical DMA addr spans 64K boundary.
3309 * Note h/w doesn't support 64-bit, so we unconditionally
3310 * truncate dma_addr_t to u32.
3312 addr
= (u32
) sg_dma_address(sg
);
3313 sg_len
= sg_dma_len(sg
);
3316 offset
= addr
& 0xffff;
3318 if ((offset
+ sg_len
) > 0x10000)
3319 len
= 0x10000 - offset
;
3321 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3322 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3323 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3332 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3335 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3336 * @qc: Metadata associated with taskfile to check
3338 * Allow low-level driver to filter ATA PACKET commands, returning
3339 * a status indicating whether or not it is OK to use DMA for the
3340 * supplied PACKET command.
3343 * spin_lock_irqsave(host lock)
3345 * RETURNS: 0 when ATAPI DMA can be used
3348 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3350 struct ata_port
*ap
= qc
->ap
;
3351 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3353 if (ap
->ops
->check_atapi_dma
)
3354 rc
= ap
->ops
->check_atapi_dma(qc
);
3359 * ata_qc_prep - Prepare taskfile for submission
3360 * @qc: Metadata associated with taskfile to be prepared
3362 * Prepare ATA taskfile for submission.
3365 * spin_lock_irqsave(host lock)
3367 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3369 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3375 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3378 * ata_sg_init_one - Associate command with memory buffer
3379 * @qc: Command to be associated
3380 * @buf: Memory buffer
3381 * @buflen: Length of memory buffer, in bytes.
3383 * Initialize the data-related elements of queued_cmd @qc
3384 * to point to a single memory buffer, @buf of byte length @buflen.
3387 * spin_lock_irqsave(host lock)
3390 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3392 struct scatterlist
*sg
;
3394 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3396 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3397 qc
->__sg
= &qc
->sgent
;
3399 qc
->orig_n_elem
= 1;
3401 qc
->nbytes
= buflen
;
3404 sg_init_one(sg
, buf
, buflen
);
3408 * ata_sg_init - Associate command with scatter-gather table.
3409 * @qc: Command to be associated
3410 * @sg: Scatter-gather table.
3411 * @n_elem: Number of elements in s/g table.
3413 * Initialize the data-related elements of queued_cmd @qc
3414 * to point to a scatter-gather table @sg, containing @n_elem
3418 * spin_lock_irqsave(host lock)
3421 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3422 unsigned int n_elem
)
3424 qc
->flags
|= ATA_QCFLAG_SG
;
3426 qc
->n_elem
= n_elem
;
3427 qc
->orig_n_elem
= n_elem
;
3431 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3432 * @qc: Command with memory buffer to be mapped.
3434 * DMA-map the memory buffer associated with queued_cmd @qc.
3437 * spin_lock_irqsave(host lock)
3440 * Zero on success, negative on error.
3443 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3445 struct ata_port
*ap
= qc
->ap
;
3446 int dir
= qc
->dma_dir
;
3447 struct scatterlist
*sg
= qc
->__sg
;
3448 dma_addr_t dma_address
;
3451 /* we must lengthen transfers to end on a 32-bit boundary */
3452 qc
->pad_len
= sg
->length
& 3;
3454 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3455 struct scatterlist
*psg
= &qc
->pad_sgent
;
3457 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3459 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3461 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3462 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3465 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3466 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3468 sg
->length
-= qc
->pad_len
;
3469 if (sg
->length
== 0)
3472 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3473 sg
->length
, qc
->pad_len
);
3481 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3483 if (dma_mapping_error(dma_address
)) {
3485 sg
->length
+= qc
->pad_len
;
3489 sg_dma_address(sg
) = dma_address
;
3490 sg_dma_len(sg
) = sg
->length
;
3493 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3494 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3500 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3501 * @qc: Command with scatter-gather table to be mapped.
3503 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3506 * spin_lock_irqsave(host lock)
3509 * Zero on success, negative on error.
3513 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3515 struct ata_port
*ap
= qc
->ap
;
3516 struct scatterlist
*sg
= qc
->__sg
;
3517 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3518 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3520 VPRINTK("ENTER, ata%u\n", ap
->id
);
3521 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3523 /* we must lengthen transfers to end on a 32-bit boundary */
3524 qc
->pad_len
= lsg
->length
& 3;
3526 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3527 struct scatterlist
*psg
= &qc
->pad_sgent
;
3528 unsigned int offset
;
3530 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3532 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3535 * psg->page/offset are used to copy to-be-written
3536 * data in this function or read data in ata_sg_clean.
3538 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3539 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3540 psg
->offset
= offset_in_page(offset
);
3542 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3543 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3544 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3545 kunmap_atomic(addr
, KM_IRQ0
);
3548 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3549 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3551 lsg
->length
-= qc
->pad_len
;
3552 if (lsg
->length
== 0)
3555 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3556 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3559 pre_n_elem
= qc
->n_elem
;
3560 if (trim_sg
&& pre_n_elem
)
3569 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3571 /* restore last sg */
3572 lsg
->length
+= qc
->pad_len
;
3576 DPRINTK("%d sg elements mapped\n", n_elem
);
3579 qc
->n_elem
= n_elem
;
3585 * swap_buf_le16 - swap halves of 16-bit words in place
3586 * @buf: Buffer to swap
3587 * @buf_words: Number of 16-bit words in buffer.
3589 * Swap halves of 16-bit words if needed to convert from
3590 * little-endian byte order to native cpu byte order, or
3594 * Inherited from caller.
3596 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3601 for (i
= 0; i
< buf_words
; i
++)
3602 buf
[i
] = le16_to_cpu(buf
[i
]);
3603 #endif /* __BIG_ENDIAN */
3607 * ata_mmio_data_xfer - Transfer data by MMIO
3608 * @adev: device for this I/O
3610 * @buflen: buffer length
3611 * @write_data: read/write
3613 * Transfer data from/to the device data register by MMIO.
3616 * Inherited from caller.
3619 void ata_mmio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3620 unsigned int buflen
, int write_data
)
3622 struct ata_port
*ap
= adev
->ap
;
3624 unsigned int words
= buflen
>> 1;
3625 u16
*buf16
= (u16
*) buf
;
3626 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3628 /* Transfer multiple of 2 bytes */
3630 for (i
= 0; i
< words
; i
++)
3631 writew(le16_to_cpu(buf16
[i
]), mmio
);
3633 for (i
= 0; i
< words
; i
++)
3634 buf16
[i
] = cpu_to_le16(readw(mmio
));
3637 /* Transfer trailing 1 byte, if any. */
3638 if (unlikely(buflen
& 0x01)) {
3639 u16 align_buf
[1] = { 0 };
3640 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3643 memcpy(align_buf
, trailing_buf
, 1);
3644 writew(le16_to_cpu(align_buf
[0]), mmio
);
3646 align_buf
[0] = cpu_to_le16(readw(mmio
));
3647 memcpy(trailing_buf
, align_buf
, 1);
3653 * ata_pio_data_xfer - Transfer data by PIO
3654 * @adev: device to target
3656 * @buflen: buffer length
3657 * @write_data: read/write
3659 * Transfer data from/to the device data register by PIO.
3662 * Inherited from caller.
3665 void ata_pio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3666 unsigned int buflen
, int write_data
)
3668 struct ata_port
*ap
= adev
->ap
;
3669 unsigned int words
= buflen
>> 1;
3671 /* Transfer multiple of 2 bytes */
3673 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3675 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3677 /* Transfer trailing 1 byte, if any. */
3678 if (unlikely(buflen
& 0x01)) {
3679 u16 align_buf
[1] = { 0 };
3680 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3683 memcpy(align_buf
, trailing_buf
, 1);
3684 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3686 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3687 memcpy(trailing_buf
, align_buf
, 1);
3693 * ata_pio_data_xfer_noirq - Transfer data by PIO
3694 * @adev: device to target
3696 * @buflen: buffer length
3697 * @write_data: read/write
3699 * Transfer data from/to the device data register by PIO. Do the
3700 * transfer with interrupts disabled.
3703 * Inherited from caller.
3706 void ata_pio_data_xfer_noirq(struct ata_device
*adev
, unsigned char *buf
,
3707 unsigned int buflen
, int write_data
)
3709 unsigned long flags
;
3710 local_irq_save(flags
);
3711 ata_pio_data_xfer(adev
, buf
, buflen
, write_data
);
3712 local_irq_restore(flags
);
3717 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3718 * @qc: Command on going
3720 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3723 * Inherited from caller.
3726 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3728 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3729 struct scatterlist
*sg
= qc
->__sg
;
3730 struct ata_port
*ap
= qc
->ap
;
3732 unsigned int offset
;
3735 if (qc
->cursect
== (qc
->nsect
- 1))
3736 ap
->hsm_task_state
= HSM_ST_LAST
;
3738 page
= sg
[qc
->cursg
].page
;
3739 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3741 /* get the current page and offset */
3742 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3743 offset
%= PAGE_SIZE
;
3745 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3747 if (PageHighMem(page
)) {
3748 unsigned long flags
;
3750 /* FIXME: use a bounce buffer */
3751 local_irq_save(flags
);
3752 buf
= kmap_atomic(page
, KM_IRQ0
);
3754 /* do the actual data transfer */
3755 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3757 kunmap_atomic(buf
, KM_IRQ0
);
3758 local_irq_restore(flags
);
3760 buf
= page_address(page
);
3761 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3767 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3774 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3775 * @qc: Command on going
3777 * Transfer one or many ATA_SECT_SIZE of data from/to the
3778 * ATA device for the DRQ request.
3781 * Inherited from caller.
3784 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3786 if (is_multi_taskfile(&qc
->tf
)) {
3787 /* READ/WRITE MULTIPLE */
3790 WARN_ON(qc
->dev
->multi_count
== 0);
3792 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3800 * atapi_send_cdb - Write CDB bytes to hardware
3801 * @ap: Port to which ATAPI device is attached.
3802 * @qc: Taskfile currently active
3804 * When device has indicated its readiness to accept
3805 * a CDB, this function is called. Send the CDB.
3811 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3814 DPRINTK("send cdb\n");
3815 WARN_ON(qc
->dev
->cdb_len
< 12);
3817 ap
->ops
->data_xfer(qc
->dev
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3818 ata_altstatus(ap
); /* flush */
3820 switch (qc
->tf
.protocol
) {
3821 case ATA_PROT_ATAPI
:
3822 ap
->hsm_task_state
= HSM_ST
;
3824 case ATA_PROT_ATAPI_NODATA
:
3825 ap
->hsm_task_state
= HSM_ST_LAST
;
3827 case ATA_PROT_ATAPI_DMA
:
3828 ap
->hsm_task_state
= HSM_ST_LAST
;
3829 /* initiate bmdma */
3830 ap
->ops
->bmdma_start(qc
);
3836 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3837 * @qc: Command on going
3838 * @bytes: number of bytes
3840 * Transfer Transfer data from/to the ATAPI device.
3843 * Inherited from caller.
3847 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3849 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3850 struct scatterlist
*sg
= qc
->__sg
;
3851 struct ata_port
*ap
= qc
->ap
;
3854 unsigned int offset
, count
;
3856 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3857 ap
->hsm_task_state
= HSM_ST_LAST
;
3860 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3862 * The end of qc->sg is reached and the device expects
3863 * more data to transfer. In order not to overrun qc->sg
3864 * and fulfill length specified in the byte count register,
3865 * - for read case, discard trailing data from the device
3866 * - for write case, padding zero data to the device
3868 u16 pad_buf
[1] = { 0 };
3869 unsigned int words
= bytes
>> 1;
3872 if (words
) /* warning if bytes > 1 */
3873 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3874 "%u bytes trailing data\n", bytes
);
3876 for (i
= 0; i
< words
; i
++)
3877 ap
->ops
->data_xfer(qc
->dev
, (unsigned char*)pad_buf
, 2, do_write
);
3879 ap
->hsm_task_state
= HSM_ST_LAST
;
3883 sg
= &qc
->__sg
[qc
->cursg
];
3886 offset
= sg
->offset
+ qc
->cursg_ofs
;
3888 /* get the current page and offset */
3889 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3890 offset
%= PAGE_SIZE
;
3892 /* don't overrun current sg */
3893 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3895 /* don't cross page boundaries */
3896 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3898 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3900 if (PageHighMem(page
)) {
3901 unsigned long flags
;
3903 /* FIXME: use bounce buffer */
3904 local_irq_save(flags
);
3905 buf
= kmap_atomic(page
, KM_IRQ0
);
3907 /* do the actual data transfer */
3908 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3910 kunmap_atomic(buf
, KM_IRQ0
);
3911 local_irq_restore(flags
);
3913 buf
= page_address(page
);
3914 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3918 qc
->curbytes
+= count
;
3919 qc
->cursg_ofs
+= count
;
3921 if (qc
->cursg_ofs
== sg
->length
) {
3931 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3932 * @qc: Command on going
3934 * Transfer Transfer data from/to the ATAPI device.
3937 * Inherited from caller.
3940 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3942 struct ata_port
*ap
= qc
->ap
;
3943 struct ata_device
*dev
= qc
->dev
;
3944 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3945 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3947 /* Abuse qc->result_tf for temp storage of intermediate TF
3948 * here to save some kernel stack usage.
3949 * For normal completion, qc->result_tf is not relevant. For
3950 * error, qc->result_tf is later overwritten by ata_qc_complete().
3951 * So, the correctness of qc->result_tf is not affected.
3953 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
3954 ireason
= qc
->result_tf
.nsect
;
3955 bc_lo
= qc
->result_tf
.lbam
;
3956 bc_hi
= qc
->result_tf
.lbah
;
3957 bytes
= (bc_hi
<< 8) | bc_lo
;
3959 /* shall be cleared to zero, indicating xfer of data */
3960 if (ireason
& (1 << 0))
3963 /* make sure transfer direction matches expected */
3964 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3965 if (do_write
!= i_write
)
3968 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3970 __atapi_pio_bytes(qc
, bytes
);
3975 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
3976 qc
->err_mask
|= AC_ERR_HSM
;
3977 ap
->hsm_task_state
= HSM_ST_ERR
;
3981 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3982 * @ap: the target ata_port
3986 * 1 if ok in workqueue, 0 otherwise.
3989 static inline int ata_hsm_ok_in_wq(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3991 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3994 if (ap
->hsm_task_state
== HSM_ST_FIRST
) {
3995 if (qc
->tf
.protocol
== ATA_PROT_PIO
&&
3996 (qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3999 if (is_atapi_taskfile(&qc
->tf
) &&
4000 !(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4008 * ata_hsm_qc_complete - finish a qc running on standard HSM
4009 * @qc: Command to complete
4010 * @in_wq: 1 if called from workqueue, 0 otherwise
4012 * Finish @qc which is running on standard HSM.
4015 * If @in_wq is zero, spin_lock_irqsave(host lock).
4016 * Otherwise, none on entry and grabs host lock.
4018 static void ata_hsm_qc_complete(struct ata_queued_cmd
*qc
, int in_wq
)
4020 struct ata_port
*ap
= qc
->ap
;
4021 unsigned long flags
;
4023 if (ap
->ops
->error_handler
) {
4025 spin_lock_irqsave(ap
->lock
, flags
);
4027 /* EH might have kicked in while host lock is
4030 qc
= ata_qc_from_tag(ap
, qc
->tag
);
4032 if (likely(!(qc
->err_mask
& AC_ERR_HSM
))) {
4034 ata_qc_complete(qc
);
4036 ata_port_freeze(ap
);
4039 spin_unlock_irqrestore(ap
->lock
, flags
);
4041 if (likely(!(qc
->err_mask
& AC_ERR_HSM
)))
4042 ata_qc_complete(qc
);
4044 ata_port_freeze(ap
);
4048 spin_lock_irqsave(ap
->lock
, flags
);
4050 ata_qc_complete(qc
);
4051 spin_unlock_irqrestore(ap
->lock
, flags
);
4053 ata_qc_complete(qc
);
4056 ata_altstatus(ap
); /* flush */
4060 * ata_hsm_move - move the HSM to the next state.
4061 * @ap: the target ata_port
4063 * @status: current device status
4064 * @in_wq: 1 if called from workqueue, 0 otherwise
4067 * 1 when poll next status needed, 0 otherwise.
4069 int ata_hsm_move(struct ata_port
*ap
, struct ata_queued_cmd
*qc
,
4070 u8 status
, int in_wq
)
4072 unsigned long flags
= 0;
4075 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
4077 /* Make sure ata_qc_issue_prot() does not throw things
4078 * like DMA polling into the workqueue. Notice that
4079 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
4081 WARN_ON(in_wq
!= ata_hsm_ok_in_wq(ap
, qc
));
4084 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4085 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
4087 switch (ap
->hsm_task_state
) {
4089 /* Send first data block or PACKET CDB */
4091 /* If polling, we will stay in the work queue after
4092 * sending the data. Otherwise, interrupt handler
4093 * takes over after sending the data.
4095 poll_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4097 /* check device status */
4098 if (unlikely((status
& ATA_DRQ
) == 0)) {
4099 /* handle BSY=0, DRQ=0 as error */
4100 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4101 /* device stops HSM for abort/error */
4102 qc
->err_mask
|= AC_ERR_DEV
;
4104 /* HSM violation. Let EH handle this */
4105 qc
->err_mask
|= AC_ERR_HSM
;
4107 ap
->hsm_task_state
= HSM_ST_ERR
;
4111 /* Device should not ask for data transfer (DRQ=1)
4112 * when it finds something wrong.
4113 * We ignore DRQ here and stop the HSM by
4114 * changing hsm_task_state to HSM_ST_ERR and
4115 * let the EH abort the command or reset the device.
4117 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4118 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4120 qc
->err_mask
|= AC_ERR_HSM
;
4121 ap
->hsm_task_state
= HSM_ST_ERR
;
4125 /* Send the CDB (atapi) or the first data block (ata pio out).
4126 * During the state transition, interrupt handler shouldn't
4127 * be invoked before the data transfer is complete and
4128 * hsm_task_state is changed. Hence, the following locking.
4131 spin_lock_irqsave(ap
->lock
, flags
);
4133 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
4134 /* PIO data out protocol.
4135 * send first data block.
4138 /* ata_pio_sectors() might change the state
4139 * to HSM_ST_LAST. so, the state is changed here
4140 * before ata_pio_sectors().
4142 ap
->hsm_task_state
= HSM_ST
;
4143 ata_pio_sectors(qc
);
4144 ata_altstatus(ap
); /* flush */
4147 atapi_send_cdb(ap
, qc
);
4150 spin_unlock_irqrestore(ap
->lock
, flags
);
4152 /* if polling, ata_pio_task() handles the rest.
4153 * otherwise, interrupt handler takes over from here.
4158 /* complete command or read/write the data register */
4159 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4160 /* ATAPI PIO protocol */
4161 if ((status
& ATA_DRQ
) == 0) {
4162 /* No more data to transfer or device error.
4163 * Device error will be tagged in HSM_ST_LAST.
4165 ap
->hsm_task_state
= HSM_ST_LAST
;
4169 /* Device should not ask for data transfer (DRQ=1)
4170 * when it finds something wrong.
4171 * We ignore DRQ here and stop the HSM by
4172 * changing hsm_task_state to HSM_ST_ERR and
4173 * let the EH abort the command or reset the device.
4175 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4176 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4178 qc
->err_mask
|= AC_ERR_HSM
;
4179 ap
->hsm_task_state
= HSM_ST_ERR
;
4183 atapi_pio_bytes(qc
);
4185 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4186 /* bad ireason reported by device */
4190 /* ATA PIO protocol */
4191 if (unlikely((status
& ATA_DRQ
) == 0)) {
4192 /* handle BSY=0, DRQ=0 as error */
4193 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4194 /* device stops HSM for abort/error */
4195 qc
->err_mask
|= AC_ERR_DEV
;
4197 /* HSM violation. Let EH handle this */
4198 qc
->err_mask
|= AC_ERR_HSM
;
4200 ap
->hsm_task_state
= HSM_ST_ERR
;
4204 /* For PIO reads, some devices may ask for
4205 * data transfer (DRQ=1) alone with ERR=1.
4206 * We respect DRQ here and transfer one
4207 * block of junk data before changing the
4208 * hsm_task_state to HSM_ST_ERR.
4210 * For PIO writes, ERR=1 DRQ=1 doesn't make
4211 * sense since the data block has been
4212 * transferred to the device.
4214 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4215 /* data might be corrputed */
4216 qc
->err_mask
|= AC_ERR_DEV
;
4218 if (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
)) {
4219 ata_pio_sectors(qc
);
4221 status
= ata_wait_idle(ap
);
4224 if (status
& (ATA_BUSY
| ATA_DRQ
))
4225 qc
->err_mask
|= AC_ERR_HSM
;
4227 /* ata_pio_sectors() might change the
4228 * state to HSM_ST_LAST. so, the state
4229 * is changed after ata_pio_sectors().
4231 ap
->hsm_task_state
= HSM_ST_ERR
;
4235 ata_pio_sectors(qc
);
4237 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4238 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4241 status
= ata_wait_idle(ap
);
4246 ata_altstatus(ap
); /* flush */
4251 if (unlikely(!ata_ok(status
))) {
4252 qc
->err_mask
|= __ac_err_mask(status
);
4253 ap
->hsm_task_state
= HSM_ST_ERR
;
4257 /* no more data to transfer */
4258 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4259 ap
->id
, qc
->dev
->devno
, status
);
4261 WARN_ON(qc
->err_mask
);
4263 ap
->hsm_task_state
= HSM_ST_IDLE
;
4265 /* complete taskfile transaction */
4266 ata_hsm_qc_complete(qc
, in_wq
);
4272 /* make sure qc->err_mask is available to
4273 * know what's wrong and recover
4275 WARN_ON(qc
->err_mask
== 0);
4277 ap
->hsm_task_state
= HSM_ST_IDLE
;
4279 /* complete taskfile transaction */
4280 ata_hsm_qc_complete(qc
, in_wq
);
4292 static void ata_pio_task(void *_data
)
4294 struct ata_queued_cmd
*qc
= _data
;
4295 struct ata_port
*ap
= qc
->ap
;
4300 WARN_ON(ap
->hsm_task_state
== HSM_ST_IDLE
);
4303 * This is purely heuristic. This is a fast path.
4304 * Sometimes when we enter, BSY will be cleared in
4305 * a chk-status or two. If not, the drive is probably seeking
4306 * or something. Snooze for a couple msecs, then
4307 * chk-status again. If still busy, queue delayed work.
4309 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
4310 if (status
& ATA_BUSY
) {
4312 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
4313 if (status
& ATA_BUSY
) {
4314 ata_port_queue_task(ap
, ata_pio_task
, qc
, ATA_SHORT_PAUSE
);
4320 poll_next
= ata_hsm_move(ap
, qc
, status
, 1);
4322 /* another command or interrupt handler
4323 * may be running at this point.
4330 * ata_qc_new - Request an available ATA command, for queueing
4331 * @ap: Port associated with device @dev
4332 * @dev: Device from whom we request an available command structure
4338 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4340 struct ata_queued_cmd
*qc
= NULL
;
4343 /* no command while frozen */
4344 if (unlikely(ap
->pflags
& ATA_PFLAG_FROZEN
))
4347 /* the last tag is reserved for internal command. */
4348 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4349 if (!test_and_set_bit(i
, &ap
->qc_allocated
)) {
4350 qc
= __ata_qc_from_tag(ap
, i
);
4361 * ata_qc_new_init - Request an available ATA command, and initialize it
4362 * @dev: Device from whom we request an available command structure
4368 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4370 struct ata_port
*ap
= dev
->ap
;
4371 struct ata_queued_cmd
*qc
;
4373 qc
= ata_qc_new(ap
);
4386 * ata_qc_free - free unused ata_queued_cmd
4387 * @qc: Command to complete
4389 * Designed to free unused ata_queued_cmd object
4390 * in case something prevents using it.
4393 * spin_lock_irqsave(host lock)
4395 void ata_qc_free(struct ata_queued_cmd
*qc
)
4397 struct ata_port
*ap
= qc
->ap
;
4400 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4404 if (likely(ata_tag_valid(tag
))) {
4405 qc
->tag
= ATA_TAG_POISON
;
4406 clear_bit(tag
, &ap
->qc_allocated
);
4410 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4412 struct ata_port
*ap
= qc
->ap
;
4414 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4415 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4417 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4420 /* command should be marked inactive atomically with qc completion */
4421 if (qc
->tf
.protocol
== ATA_PROT_NCQ
)
4422 ap
->sactive
&= ~(1 << qc
->tag
);
4424 ap
->active_tag
= ATA_TAG_POISON
;
4426 /* atapi: mark qc as inactive to prevent the interrupt handler
4427 * from completing the command twice later, before the error handler
4428 * is called. (when rc != 0 and atapi request sense is needed)
4430 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4431 ap
->qc_active
&= ~(1 << qc
->tag
);
4433 /* call completion callback */
4434 qc
->complete_fn(qc
);
4438 * ata_qc_complete - Complete an active ATA command
4439 * @qc: Command to complete
4440 * @err_mask: ATA Status register contents
4442 * Indicate to the mid and upper layers that an ATA
4443 * command has completed, with either an ok or not-ok status.
4446 * spin_lock_irqsave(host lock)
4448 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4450 struct ata_port
*ap
= qc
->ap
;
4452 /* XXX: New EH and old EH use different mechanisms to
4453 * synchronize EH with regular execution path.
4455 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4456 * Normal execution path is responsible for not accessing a
4457 * failed qc. libata core enforces the rule by returning NULL
4458 * from ata_qc_from_tag() for failed qcs.
4460 * Old EH depends on ata_qc_complete() nullifying completion
4461 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4462 * not synchronize with interrupt handler. Only PIO task is
4465 if (ap
->ops
->error_handler
) {
4466 WARN_ON(ap
->pflags
& ATA_PFLAG_FROZEN
);
4468 if (unlikely(qc
->err_mask
))
4469 qc
->flags
|= ATA_QCFLAG_FAILED
;
4471 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4472 if (!ata_tag_internal(qc
->tag
)) {
4473 /* always fill result TF for failed qc */
4474 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4475 ata_qc_schedule_eh(qc
);
4480 /* read result TF if requested */
4481 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4482 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4484 __ata_qc_complete(qc
);
4486 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4489 /* read result TF if failed or requested */
4490 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4491 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4493 __ata_qc_complete(qc
);
4498 * ata_qc_complete_multiple - Complete multiple qcs successfully
4499 * @ap: port in question
4500 * @qc_active: new qc_active mask
4501 * @finish_qc: LLDD callback invoked before completing a qc
4503 * Complete in-flight commands. This functions is meant to be
4504 * called from low-level driver's interrupt routine to complete
4505 * requests normally. ap->qc_active and @qc_active is compared
4506 * and commands are completed accordingly.
4509 * spin_lock_irqsave(host lock)
4512 * Number of completed commands on success, -errno otherwise.
4514 int ata_qc_complete_multiple(struct ata_port
*ap
, u32 qc_active
,
4515 void (*finish_qc
)(struct ata_queued_cmd
*))
4521 done_mask
= ap
->qc_active
^ qc_active
;
4523 if (unlikely(done_mask
& qc_active
)) {
4524 ata_port_printk(ap
, KERN_ERR
, "illegal qc_active transition "
4525 "(%08x->%08x)\n", ap
->qc_active
, qc_active
);
4529 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
4530 struct ata_queued_cmd
*qc
;
4532 if (!(done_mask
& (1 << i
)))
4535 if ((qc
= ata_qc_from_tag(ap
, i
))) {
4538 ata_qc_complete(qc
);
4546 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4548 struct ata_port
*ap
= qc
->ap
;
4550 switch (qc
->tf
.protocol
) {
4553 case ATA_PROT_ATAPI_DMA
:
4556 case ATA_PROT_ATAPI
:
4558 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4571 * ata_qc_issue - issue taskfile to device
4572 * @qc: command to issue to device
4574 * Prepare an ATA command to submission to device.
4575 * This includes mapping the data into a DMA-able
4576 * area, filling in the S/G table, and finally
4577 * writing the taskfile to hardware, starting the command.
4580 * spin_lock_irqsave(host lock)
4582 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4584 struct ata_port
*ap
= qc
->ap
;
4586 /* Make sure only one non-NCQ command is outstanding. The
4587 * check is skipped for old EH because it reuses active qc to
4588 * request ATAPI sense.
4590 WARN_ON(ap
->ops
->error_handler
&& ata_tag_valid(ap
->active_tag
));
4592 if (qc
->tf
.protocol
== ATA_PROT_NCQ
) {
4593 WARN_ON(ap
->sactive
& (1 << qc
->tag
));
4594 ap
->sactive
|= 1 << qc
->tag
;
4596 WARN_ON(ap
->sactive
);
4597 ap
->active_tag
= qc
->tag
;
4600 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4601 ap
->qc_active
|= 1 << qc
->tag
;
4603 if (ata_should_dma_map(qc
)) {
4604 if (qc
->flags
& ATA_QCFLAG_SG
) {
4605 if (ata_sg_setup(qc
))
4607 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4608 if (ata_sg_setup_one(qc
))
4612 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4615 ap
->ops
->qc_prep(qc
);
4617 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4618 if (unlikely(qc
->err_mask
))
4623 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4624 qc
->err_mask
|= AC_ERR_SYSTEM
;
4626 ata_qc_complete(qc
);
4630 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4631 * @qc: command to issue to device
4633 * Using various libata functions and hooks, this function
4634 * starts an ATA command. ATA commands are grouped into
4635 * classes called "protocols", and issuing each type of protocol
4636 * is slightly different.
4638 * May be used as the qc_issue() entry in ata_port_operations.
4641 * spin_lock_irqsave(host lock)
4644 * Zero on success, AC_ERR_* mask on failure
4647 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4649 struct ata_port
*ap
= qc
->ap
;
4651 /* Use polling pio if the LLD doesn't handle
4652 * interrupt driven pio and atapi CDB interrupt.
4654 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4655 switch (qc
->tf
.protocol
) {
4657 case ATA_PROT_ATAPI
:
4658 case ATA_PROT_ATAPI_NODATA
:
4659 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4661 case ATA_PROT_ATAPI_DMA
:
4662 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4663 /* see ata_dma_blacklisted() */
4671 /* select the device */
4672 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4674 /* start the command */
4675 switch (qc
->tf
.protocol
) {
4676 case ATA_PROT_NODATA
:
4677 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4678 ata_qc_set_polling(qc
);
4680 ata_tf_to_host(ap
, &qc
->tf
);
4681 ap
->hsm_task_state
= HSM_ST_LAST
;
4683 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4684 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4689 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4691 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4692 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4693 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4694 ap
->hsm_task_state
= HSM_ST_LAST
;
4698 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4699 ata_qc_set_polling(qc
);
4701 ata_tf_to_host(ap
, &qc
->tf
);
4703 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4704 /* PIO data out protocol */
4705 ap
->hsm_task_state
= HSM_ST_FIRST
;
4706 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4708 /* always send first data block using
4709 * the ata_pio_task() codepath.
4712 /* PIO data in protocol */
4713 ap
->hsm_task_state
= HSM_ST
;
4715 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4716 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4718 /* if polling, ata_pio_task() handles the rest.
4719 * otherwise, interrupt handler takes over from here.
4725 case ATA_PROT_ATAPI
:
4726 case ATA_PROT_ATAPI_NODATA
:
4727 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4728 ata_qc_set_polling(qc
);
4730 ata_tf_to_host(ap
, &qc
->tf
);
4732 ap
->hsm_task_state
= HSM_ST_FIRST
;
4734 /* send cdb by polling if no cdb interrupt */
4735 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4736 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4737 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4740 case ATA_PROT_ATAPI_DMA
:
4741 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4743 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4744 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4745 ap
->hsm_task_state
= HSM_ST_FIRST
;
4747 /* send cdb by polling if no cdb interrupt */
4748 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4749 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4754 return AC_ERR_SYSTEM
;
4761 * ata_host_intr - Handle host interrupt for given (port, task)
4762 * @ap: Port on which interrupt arrived (possibly...)
4763 * @qc: Taskfile currently active in engine
4765 * Handle host interrupt for given queued command. Currently,
4766 * only DMA interrupts are handled. All other commands are
4767 * handled via polling with interrupts disabled (nIEN bit).
4770 * spin_lock_irqsave(host lock)
4773 * One if interrupt was handled, zero if not (shared irq).
4776 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4777 struct ata_queued_cmd
*qc
)
4779 u8 status
, host_stat
= 0;
4781 VPRINTK("ata%u: protocol %d task_state %d\n",
4782 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4784 /* Check whether we are expecting interrupt in this state */
4785 switch (ap
->hsm_task_state
) {
4787 /* Some pre-ATAPI-4 devices assert INTRQ
4788 * at this state when ready to receive CDB.
4791 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4792 * The flag was turned on only for atapi devices.
4793 * No need to check is_atapi_taskfile(&qc->tf) again.
4795 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4799 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4800 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4801 /* check status of DMA engine */
4802 host_stat
= ap
->ops
->bmdma_status(ap
);
4803 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4805 /* if it's not our irq... */
4806 if (!(host_stat
& ATA_DMA_INTR
))
4809 /* before we do anything else, clear DMA-Start bit */
4810 ap
->ops
->bmdma_stop(qc
);
4812 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4813 /* error when transfering data to/from memory */
4814 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4815 ap
->hsm_task_state
= HSM_ST_ERR
;
4825 /* check altstatus */
4826 status
= ata_altstatus(ap
);
4827 if (status
& ATA_BUSY
)
4830 /* check main status, clearing INTRQ */
4831 status
= ata_chk_status(ap
);
4832 if (unlikely(status
& ATA_BUSY
))
4835 /* ack bmdma irq events */
4836 ap
->ops
->irq_clear(ap
);
4838 ata_hsm_move(ap
, qc
, status
, 0);
4839 return 1; /* irq handled */
4842 ap
->stats
.idle_irq
++;
4845 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4846 ata_irq_ack(ap
, 0); /* debug trap */
4847 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4851 return 0; /* irq not handled */
4855 * ata_interrupt - Default ATA host interrupt handler
4856 * @irq: irq line (unused)
4857 * @dev_instance: pointer to our ata_host information structure
4860 * Default interrupt handler for PCI IDE devices. Calls
4861 * ata_host_intr() for each port that is not disabled.
4864 * Obtains host lock during operation.
4867 * IRQ_NONE or IRQ_HANDLED.
4870 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4872 struct ata_host
*host
= dev_instance
;
4874 unsigned int handled
= 0;
4875 unsigned long flags
;
4877 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4878 spin_lock_irqsave(&host
->lock
, flags
);
4880 for (i
= 0; i
< host
->n_ports
; i
++) {
4881 struct ata_port
*ap
;
4883 ap
= host
->ports
[i
];
4885 !(ap
->flags
& ATA_FLAG_DISABLED
)) {
4886 struct ata_queued_cmd
*qc
;
4888 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4889 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4890 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4891 handled
|= ata_host_intr(ap
, qc
);
4895 spin_unlock_irqrestore(&host
->lock
, flags
);
4897 return IRQ_RETVAL(handled
);
4901 * sata_scr_valid - test whether SCRs are accessible
4902 * @ap: ATA port to test SCR accessibility for
4904 * Test whether SCRs are accessible for @ap.
4910 * 1 if SCRs are accessible, 0 otherwise.
4912 int sata_scr_valid(struct ata_port
*ap
)
4914 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4918 * sata_scr_read - read SCR register of the specified port
4919 * @ap: ATA port to read SCR for
4921 * @val: Place to store read value
4923 * Read SCR register @reg of @ap into *@val. This function is
4924 * guaranteed to succeed if the cable type of the port is SATA
4925 * and the port implements ->scr_read.
4931 * 0 on success, negative errno on failure.
4933 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4935 if (sata_scr_valid(ap
)) {
4936 *val
= ap
->ops
->scr_read(ap
, reg
);
4943 * sata_scr_write - write SCR register of the specified port
4944 * @ap: ATA port to write SCR for
4945 * @reg: SCR to write
4946 * @val: value to write
4948 * Write @val to SCR register @reg of @ap. This function is
4949 * guaranteed to succeed if the cable type of the port is SATA
4950 * and the port implements ->scr_read.
4956 * 0 on success, negative errno on failure.
4958 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4960 if (sata_scr_valid(ap
)) {
4961 ap
->ops
->scr_write(ap
, reg
, val
);
4968 * sata_scr_write_flush - write SCR register of the specified port and flush
4969 * @ap: ATA port to write SCR for
4970 * @reg: SCR to write
4971 * @val: value to write
4973 * This function is identical to sata_scr_write() except that this
4974 * function performs flush after writing to the register.
4980 * 0 on success, negative errno on failure.
4982 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4984 if (sata_scr_valid(ap
)) {
4985 ap
->ops
->scr_write(ap
, reg
, val
);
4986 ap
->ops
->scr_read(ap
, reg
);
4993 * ata_port_online - test whether the given port is online
4994 * @ap: ATA port to test
4996 * Test whether @ap is online. Note that this function returns 0
4997 * if online status of @ap cannot be obtained, so
4998 * ata_port_online(ap) != !ata_port_offline(ap).
5004 * 1 if the port online status is available and online.
5006 int ata_port_online(struct ata_port
*ap
)
5010 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
5016 * ata_port_offline - test whether the given port is offline
5017 * @ap: ATA port to test
5019 * Test whether @ap is offline. Note that this function returns
5020 * 0 if offline status of @ap cannot be obtained, so
5021 * ata_port_online(ap) != !ata_port_offline(ap).
5027 * 1 if the port offline status is available and offline.
5029 int ata_port_offline(struct ata_port
*ap
)
5033 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
5038 int ata_flush_cache(struct ata_device
*dev
)
5040 unsigned int err_mask
;
5043 if (!ata_try_flush_cache(dev
))
5046 if (ata_id_has_flush_ext(dev
->id
))
5047 cmd
= ATA_CMD_FLUSH_EXT
;
5049 cmd
= ATA_CMD_FLUSH
;
5051 err_mask
= ata_do_simple_cmd(dev
, cmd
);
5053 ata_dev_printk(dev
, KERN_ERR
, "failed to flush cache\n");
5060 static int ata_host_request_pm(struct ata_host
*host
, pm_message_t mesg
,
5061 unsigned int action
, unsigned int ehi_flags
,
5064 unsigned long flags
;
5067 for (i
= 0; i
< host
->n_ports
; i
++) {
5068 struct ata_port
*ap
= host
->ports
[i
];
5070 /* Previous resume operation might still be in
5071 * progress. Wait for PM_PENDING to clear.
5073 if (ap
->pflags
& ATA_PFLAG_PM_PENDING
) {
5074 ata_port_wait_eh(ap
);
5075 WARN_ON(ap
->pflags
& ATA_PFLAG_PM_PENDING
);
5078 /* request PM ops to EH */
5079 spin_lock_irqsave(ap
->lock
, flags
);
5084 ap
->pm_result
= &rc
;
5087 ap
->pflags
|= ATA_PFLAG_PM_PENDING
;
5088 ap
->eh_info
.action
|= action
;
5089 ap
->eh_info
.flags
|= ehi_flags
;
5091 ata_port_schedule_eh(ap
);
5093 spin_unlock_irqrestore(ap
->lock
, flags
);
5095 /* wait and check result */
5097 ata_port_wait_eh(ap
);
5098 WARN_ON(ap
->pflags
& ATA_PFLAG_PM_PENDING
);
5108 * ata_host_suspend - suspend host
5109 * @host: host to suspend
5112 * Suspend @host. Actual operation is performed by EH. This
5113 * function requests EH to perform PM operations and waits for EH
5117 * Kernel thread context (may sleep).
5120 * 0 on success, -errno on failure.
5122 int ata_host_suspend(struct ata_host
*host
, pm_message_t mesg
)
5126 rc
= ata_host_request_pm(host
, mesg
, 0, ATA_EHI_QUIET
, 1);
5130 /* EH is quiescent now. Fail if we have any ready device.
5131 * This happens if hotplug occurs between completion of device
5132 * suspension and here.
5134 for (i
= 0; i
< host
->n_ports
; i
++) {
5135 struct ata_port
*ap
= host
->ports
[i
];
5137 for (j
= 0; j
< ATA_MAX_DEVICES
; j
++) {
5138 struct ata_device
*dev
= &ap
->device
[j
];
5140 if (ata_dev_ready(dev
)) {
5141 ata_port_printk(ap
, KERN_WARNING
,
5142 "suspend failed, device %d "
5143 "still active\n", dev
->devno
);
5150 host
->dev
->power
.power_state
= mesg
;
5154 ata_host_resume(host
);
5159 * ata_host_resume - resume host
5160 * @host: host to resume
5162 * Resume @host. Actual operation is performed by EH. This
5163 * function requests EH to perform PM operations and returns.
5164 * Note that all resume operations are performed parallely.
5167 * Kernel thread context (may sleep).
5169 void ata_host_resume(struct ata_host
*host
)
5171 ata_host_request_pm(host
, PMSG_ON
, ATA_EH_SOFTRESET
,
5172 ATA_EHI_NO_AUTOPSY
| ATA_EHI_QUIET
, 0);
5173 host
->dev
->power
.power_state
= PMSG_ON
;
5177 * ata_port_start - Set port up for dma.
5178 * @ap: Port to initialize
5180 * Called just after data structures for each port are
5181 * initialized. Allocates space for PRD table.
5183 * May be used as the port_start() entry in ata_port_operations.
5186 * Inherited from caller.
5189 int ata_port_start (struct ata_port
*ap
)
5191 struct device
*dev
= ap
->dev
;
5194 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
5198 rc
= ata_pad_alloc(ap
, dev
);
5200 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5204 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
5211 * ata_port_stop - Undo ata_port_start()
5212 * @ap: Port to shut down
5214 * Frees the PRD table.
5216 * May be used as the port_stop() entry in ata_port_operations.
5219 * Inherited from caller.
5222 void ata_port_stop (struct ata_port
*ap
)
5224 struct device
*dev
= ap
->dev
;
5226 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5227 ata_pad_free(ap
, dev
);
5230 void ata_host_stop (struct ata_host
*host
)
5232 if (host
->mmio_base
)
5233 iounmap(host
->mmio_base
);
5237 * ata_dev_init - Initialize an ata_device structure
5238 * @dev: Device structure to initialize
5240 * Initialize @dev in preparation for probing.
5243 * Inherited from caller.
5245 void ata_dev_init(struct ata_device
*dev
)
5247 struct ata_port
*ap
= dev
->ap
;
5248 unsigned long flags
;
5250 /* SATA spd limit is bound to the first device */
5251 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5253 /* High bits of dev->flags are used to record warm plug
5254 * requests which occur asynchronously. Synchronize using
5257 spin_lock_irqsave(ap
->lock
, flags
);
5258 dev
->flags
&= ~ATA_DFLAG_INIT_MASK
;
5259 spin_unlock_irqrestore(ap
->lock
, flags
);
5261 memset((void *)dev
+ ATA_DEVICE_CLEAR_OFFSET
, 0,
5262 sizeof(*dev
) - ATA_DEVICE_CLEAR_OFFSET
);
5263 dev
->pio_mask
= UINT_MAX
;
5264 dev
->mwdma_mask
= UINT_MAX
;
5265 dev
->udma_mask
= UINT_MAX
;
5269 * ata_port_init - Initialize an ata_port structure
5270 * @ap: Structure to initialize
5271 * @host: Collection of hosts to which @ap belongs
5272 * @ent: Probe information provided by low-level driver
5273 * @port_no: Port number associated with this ata_port
5275 * Initialize a new ata_port structure.
5278 * Inherited from caller.
5280 void ata_port_init(struct ata_port
*ap
, struct ata_host
*host
,
5281 const struct ata_probe_ent
*ent
, unsigned int port_no
)
5285 ap
->lock
= &host
->lock
;
5286 ap
->flags
= ATA_FLAG_DISABLED
;
5287 ap
->id
= ata_unique_id
++;
5288 ap
->ctl
= ATA_DEVCTL_OBS
;
5291 ap
->port_no
= port_no
;
5292 if (port_no
== 1 && ent
->pinfo2
) {
5293 ap
->pio_mask
= ent
->pinfo2
->pio_mask
;
5294 ap
->mwdma_mask
= ent
->pinfo2
->mwdma_mask
;
5295 ap
->udma_mask
= ent
->pinfo2
->udma_mask
;
5296 ap
->flags
|= ent
->pinfo2
->flags
;
5297 ap
->ops
= ent
->pinfo2
->port_ops
;
5299 ap
->pio_mask
= ent
->pio_mask
;
5300 ap
->mwdma_mask
= ent
->mwdma_mask
;
5301 ap
->udma_mask
= ent
->udma_mask
;
5302 ap
->flags
|= ent
->port_flags
;
5303 ap
->ops
= ent
->port_ops
;
5305 ap
->hw_sata_spd_limit
= UINT_MAX
;
5306 ap
->active_tag
= ATA_TAG_POISON
;
5307 ap
->last_ctl
= 0xFF;
5309 #if defined(ATA_VERBOSE_DEBUG)
5310 /* turn on all debugging levels */
5311 ap
->msg_enable
= 0x00FF;
5312 #elif defined(ATA_DEBUG)
5313 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_INFO
| ATA_MSG_CTL
| ATA_MSG_WARN
| ATA_MSG_ERR
;
5315 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_ERR
| ATA_MSG_WARN
;
5318 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
5319 INIT_WORK(&ap
->hotplug_task
, ata_scsi_hotplug
, ap
);
5320 INIT_WORK(&ap
->scsi_rescan_task
, ata_scsi_dev_rescan
, ap
);
5321 INIT_LIST_HEAD(&ap
->eh_done_q
);
5322 init_waitqueue_head(&ap
->eh_wait_q
);
5324 /* set cable type */
5325 ap
->cbl
= ATA_CBL_NONE
;
5326 if (ap
->flags
& ATA_FLAG_SATA
)
5327 ap
->cbl
= ATA_CBL_SATA
;
5329 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
5330 struct ata_device
*dev
= &ap
->device
[i
];
5337 ap
->stats
.unhandled_irq
= 1;
5338 ap
->stats
.idle_irq
= 1;
5341 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
5345 * ata_port_init_shost - Initialize SCSI host associated with ATA port
5346 * @ap: ATA port to initialize SCSI host for
5347 * @shost: SCSI host associated with @ap
5349 * Initialize SCSI host @shost associated with ATA port @ap.
5352 * Inherited from caller.
5354 static void ata_port_init_shost(struct ata_port
*ap
, struct Scsi_Host
*shost
)
5356 ap
->scsi_host
= shost
;
5358 shost
->unique_id
= ap
->id
;
5361 shost
->max_channel
= 1;
5362 shost
->max_cmd_len
= 12;
5366 * ata_port_add - Attach low-level ATA driver to system
5367 * @ent: Information provided by low-level driver
5368 * @host: Collections of ports to which we add
5369 * @port_no: Port number associated with this host
5371 * Attach low-level ATA driver to system.
5374 * PCI/etc. bus probe sem.
5377 * New ata_port on success, for NULL on error.
5379 static struct ata_port
* ata_port_add(const struct ata_probe_ent
*ent
,
5380 struct ata_host
*host
,
5381 unsigned int port_no
)
5383 struct Scsi_Host
*shost
;
5384 struct ata_port
*ap
;
5388 if (!ent
->port_ops
->error_handler
&&
5389 !(ent
->port_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
5390 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
5395 shost
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
5399 shost
->transportt
= &ata_scsi_transport_template
;
5401 ap
= ata_shost_to_port(shost
);
5403 ata_port_init(ap
, host
, ent
, port_no
);
5404 ata_port_init_shost(ap
, shost
);
5410 * ata_sas_host_init - Initialize a host struct
5411 * @host: host to initialize
5412 * @dev: device host is attached to
5413 * @flags: host flags
5417 * PCI/etc. bus probe sem.
5421 void ata_host_init(struct ata_host
*host
, struct device
*dev
,
5422 unsigned long flags
, const struct ata_port_operations
*ops
)
5424 spin_lock_init(&host
->lock
);
5426 host
->flags
= flags
;
5431 * ata_device_add - Register hardware device with ATA and SCSI layers
5432 * @ent: Probe information describing hardware device to be registered
5434 * This function processes the information provided in the probe
5435 * information struct @ent, allocates the necessary ATA and SCSI
5436 * host information structures, initializes them, and registers
5437 * everything with requisite kernel subsystems.
5439 * This function requests irqs, probes the ATA bus, and probes
5443 * PCI/etc. bus probe sem.
5446 * Number of ports registered. Zero on error (no ports registered).
5448 int ata_device_add(const struct ata_probe_ent
*ent
)
5451 struct device
*dev
= ent
->dev
;
5452 struct ata_host
*host
;
5457 if (ent
->irq
== 0) {
5458 dev_printk(KERN_ERR
, dev
, "is not available: No interrupt assigned.\n");
5461 /* alloc a container for our list of ATA ports (buses) */
5462 host
= kzalloc(sizeof(struct ata_host
) +
5463 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
5467 ata_host_init(host
, dev
, ent
->_host_flags
, ent
->port_ops
);
5468 host
->n_ports
= ent
->n_ports
;
5469 host
->irq
= ent
->irq
;
5470 host
->irq2
= ent
->irq2
;
5471 host
->mmio_base
= ent
->mmio_base
;
5472 host
->private_data
= ent
->private_data
;
5474 /* register each port bound to this device */
5475 for (i
= 0; i
< host
->n_ports
; i
++) {
5476 struct ata_port
*ap
;
5477 unsigned long xfer_mode_mask
;
5478 int irq_line
= ent
->irq
;
5480 ap
= ata_port_add(ent
, host
, i
);
5484 host
->ports
[i
] = ap
;
5487 if (ent
->dummy_port_mask
& (1 << i
)) {
5488 ata_port_printk(ap
, KERN_INFO
, "DUMMY\n");
5489 ap
->ops
= &ata_dummy_port_ops
;
5494 rc
= ap
->ops
->port_start(ap
);
5496 host
->ports
[i
] = NULL
;
5497 scsi_host_put(ap
->scsi_host
);
5501 /* Report the secondary IRQ for second channel legacy */
5502 if (i
== 1 && ent
->irq2
)
5503 irq_line
= ent
->irq2
;
5505 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
5506 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
5507 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
5509 /* print per-port info to dmesg */
5510 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
5511 "ctl 0x%lX bmdma 0x%lX irq %d\n",
5512 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
5513 ata_mode_string(xfer_mode_mask
),
5514 ap
->ioaddr
.cmd_addr
,
5515 ap
->ioaddr
.ctl_addr
,
5516 ap
->ioaddr
.bmdma_addr
,
5520 host
->ops
->irq_clear(ap
);
5521 ata_eh_freeze_port(ap
); /* freeze port before requesting IRQ */
5524 /* obtain irq, that may be shared between channels */
5525 rc
= request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5528 dev_printk(KERN_ERR
, dev
, "irq %lu request failed: %d\n",
5533 /* do we have a second IRQ for the other channel, eg legacy mode */
5535 /* We will get weird core code crashes later if this is true
5537 BUG_ON(ent
->irq
== ent
->irq2
);
5539 rc
= request_irq(ent
->irq2
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5542 dev_printk(KERN_ERR
, dev
, "irq %lu request failed: %d\n",
5544 goto err_out_free_irq
;
5548 /* perform each probe synchronously */
5549 DPRINTK("probe begin\n");
5550 for (i
= 0; i
< host
->n_ports
; i
++) {
5551 struct ata_port
*ap
= host
->ports
[i
];
5555 /* init sata_spd_limit to the current value */
5556 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
5557 int spd
= (scontrol
>> 4) & 0xf;
5558 ap
->hw_sata_spd_limit
&= (1 << spd
) - 1;
5560 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5562 rc
= scsi_add_host(ap
->scsi_host
, dev
);
5564 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
5565 /* FIXME: do something useful here */
5566 /* FIXME: handle unconditional calls to
5567 * scsi_scan_host and ata_host_remove, below,
5572 if (ap
->ops
->error_handler
) {
5573 struct ata_eh_info
*ehi
= &ap
->eh_info
;
5574 unsigned long flags
;
5578 /* kick EH for boot probing */
5579 spin_lock_irqsave(ap
->lock
, flags
);
5581 ehi
->probe_mask
= (1 << ATA_MAX_DEVICES
) - 1;
5582 ehi
->action
|= ATA_EH_SOFTRESET
;
5583 ehi
->flags
|= ATA_EHI_NO_AUTOPSY
| ATA_EHI_QUIET
;
5585 ap
->pflags
|= ATA_PFLAG_LOADING
;
5586 ata_port_schedule_eh(ap
);
5588 spin_unlock_irqrestore(ap
->lock
, flags
);
5590 /* wait for EH to finish */
5591 ata_port_wait_eh(ap
);
5593 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5594 rc
= ata_bus_probe(ap
);
5595 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5598 /* FIXME: do something useful here?
5599 * Current libata behavior will
5600 * tear down everything when
5601 * the module is removed
5602 * or the h/w is unplugged.
5608 /* probes are done, now scan each port's disk(s) */
5609 DPRINTK("host probe begin\n");
5610 for (i
= 0; i
< host
->n_ports
; i
++) {
5611 struct ata_port
*ap
= host
->ports
[i
];
5613 ata_scsi_scan_host(ap
);
5616 dev_set_drvdata(dev
, host
);
5618 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5619 return ent
->n_ports
; /* success */
5622 free_irq(ent
->irq
, host
);
5624 for (i
= 0; i
< host
->n_ports
; i
++) {
5625 struct ata_port
*ap
= host
->ports
[i
];
5627 ap
->ops
->port_stop(ap
);
5628 scsi_host_put(ap
->scsi_host
);
5633 VPRINTK("EXIT, returning 0\n");
5638 * ata_port_detach - Detach ATA port in prepration of device removal
5639 * @ap: ATA port to be detached
5641 * Detach all ATA devices and the associated SCSI devices of @ap;
5642 * then, remove the associated SCSI host. @ap is guaranteed to
5643 * be quiescent on return from this function.
5646 * Kernel thread context (may sleep).
5648 void ata_port_detach(struct ata_port
*ap
)
5650 unsigned long flags
;
5653 if (!ap
->ops
->error_handler
)
5656 /* tell EH we're leaving & flush EH */
5657 spin_lock_irqsave(ap
->lock
, flags
);
5658 ap
->pflags
|= ATA_PFLAG_UNLOADING
;
5659 spin_unlock_irqrestore(ap
->lock
, flags
);
5661 ata_port_wait_eh(ap
);
5663 /* EH is now guaranteed to see UNLOADING, so no new device
5664 * will be attached. Disable all existing devices.
5666 spin_lock_irqsave(ap
->lock
, flags
);
5668 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
5669 ata_dev_disable(&ap
->device
[i
]);
5671 spin_unlock_irqrestore(ap
->lock
, flags
);
5673 /* Final freeze & EH. All in-flight commands are aborted. EH
5674 * will be skipped and retrials will be terminated with bad
5677 spin_lock_irqsave(ap
->lock
, flags
);
5678 ata_port_freeze(ap
); /* won't be thawed */
5679 spin_unlock_irqrestore(ap
->lock
, flags
);
5681 ata_port_wait_eh(ap
);
5683 /* Flush hotplug task. The sequence is similar to
5684 * ata_port_flush_task().
5686 flush_workqueue(ata_aux_wq
);
5687 cancel_delayed_work(&ap
->hotplug_task
);
5688 flush_workqueue(ata_aux_wq
);
5691 /* remove the associated SCSI host */
5692 scsi_remove_host(ap
->scsi_host
);
5696 * ata_host_remove - PCI layer callback for device removal
5697 * @host: ATA host set that was removed
5699 * Unregister all objects associated with this host set. Free those
5703 * Inherited from calling layer (may sleep).
5706 void ata_host_remove(struct ata_host
*host
)
5710 for (i
= 0; i
< host
->n_ports
; i
++)
5711 ata_port_detach(host
->ports
[i
]);
5713 free_irq(host
->irq
, host
);
5715 free_irq(host
->irq2
, host
);
5717 for (i
= 0; i
< host
->n_ports
; i
++) {
5718 struct ata_port
*ap
= host
->ports
[i
];
5720 ata_scsi_release(ap
->scsi_host
);
5722 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5723 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5725 /* FIXME: Add -ac IDE pci mods to remove these special cases */
5726 if (ioaddr
->cmd_addr
== ATA_PRIMARY_CMD
)
5727 release_region(ATA_PRIMARY_CMD
, 8);
5728 else if (ioaddr
->cmd_addr
== ATA_SECONDARY_CMD
)
5729 release_region(ATA_SECONDARY_CMD
, 8);
5732 scsi_host_put(ap
->scsi_host
);
5735 if (host
->ops
->host_stop
)
5736 host
->ops
->host_stop(host
);
5742 * ata_scsi_release - SCSI layer callback hook for host unload
5743 * @host: libata host to be unloaded
5745 * Performs all duties necessary to shut down a libata port...
5746 * Kill port kthread, disable port, and release resources.
5749 * Inherited from SCSI layer.
5755 int ata_scsi_release(struct Scsi_Host
*shost
)
5757 struct ata_port
*ap
= ata_shost_to_port(shost
);
5761 ap
->ops
->port_disable(ap
);
5762 ap
->ops
->port_stop(ap
);
5768 struct ata_probe_ent
*
5769 ata_probe_ent_alloc(struct device
*dev
, const struct ata_port_info
*port
)
5771 struct ata_probe_ent
*probe_ent
;
5773 probe_ent
= kzalloc(sizeof(*probe_ent
), GFP_KERNEL
);
5775 printk(KERN_ERR DRV_NAME
"(%s): out of memory\n",
5776 kobject_name(&(dev
->kobj
)));
5780 INIT_LIST_HEAD(&probe_ent
->node
);
5781 probe_ent
->dev
= dev
;
5783 probe_ent
->sht
= port
->sht
;
5784 probe_ent
->port_flags
= port
->flags
;
5785 probe_ent
->pio_mask
= port
->pio_mask
;
5786 probe_ent
->mwdma_mask
= port
->mwdma_mask
;
5787 probe_ent
->udma_mask
= port
->udma_mask
;
5788 probe_ent
->port_ops
= port
->port_ops
;
5794 * ata_std_ports - initialize ioaddr with standard port offsets.
5795 * @ioaddr: IO address structure to be initialized
5797 * Utility function which initializes data_addr, error_addr,
5798 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5799 * device_addr, status_addr, and command_addr to standard offsets
5800 * relative to cmd_addr.
5802 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5805 void ata_std_ports(struct ata_ioports
*ioaddr
)
5807 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5808 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5809 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5810 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5811 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5812 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5813 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5814 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5815 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5816 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5822 void ata_pci_host_stop (struct ata_host
*host
)
5824 struct pci_dev
*pdev
= to_pci_dev(host
->dev
);
5826 pci_iounmap(pdev
, host
->mmio_base
);
5830 * ata_pci_remove_one - PCI layer callback for device removal
5831 * @pdev: PCI device that was removed
5833 * PCI layer indicates to libata via this hook that
5834 * hot-unplug or module unload event has occurred.
5835 * Handle this by unregistering all objects associated
5836 * with this PCI device. Free those objects. Then finally
5837 * release PCI resources and disable device.
5840 * Inherited from PCI layer (may sleep).
5843 void ata_pci_remove_one (struct pci_dev
*pdev
)
5845 struct device
*dev
= pci_dev_to_dev(pdev
);
5846 struct ata_host
*host
= dev_get_drvdata(dev
);
5848 ata_host_remove(host
);
5850 pci_release_regions(pdev
);
5851 pci_disable_device(pdev
);
5852 dev_set_drvdata(dev
, NULL
);
5855 /* move to PCI subsystem */
5856 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5858 unsigned long tmp
= 0;
5860 switch (bits
->width
) {
5863 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5869 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5875 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5886 return (tmp
== bits
->val
) ? 1 : 0;
5889 void ata_pci_device_do_suspend(struct pci_dev
*pdev
, pm_message_t mesg
)
5891 pci_save_state(pdev
);
5893 if (mesg
.event
== PM_EVENT_SUSPEND
) {
5894 pci_disable_device(pdev
);
5895 pci_set_power_state(pdev
, PCI_D3hot
);
5899 void ata_pci_device_do_resume(struct pci_dev
*pdev
)
5901 pci_set_power_state(pdev
, PCI_D0
);
5902 pci_restore_state(pdev
);
5903 pci_enable_device(pdev
);
5904 pci_set_master(pdev
);
5907 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t mesg
)
5909 struct ata_host
*host
= dev_get_drvdata(&pdev
->dev
);
5912 rc
= ata_host_suspend(host
, mesg
);
5916 ata_pci_device_do_suspend(pdev
, mesg
);
5921 int ata_pci_device_resume(struct pci_dev
*pdev
)
5923 struct ata_host
*host
= dev_get_drvdata(&pdev
->dev
);
5925 ata_pci_device_do_resume(pdev
);
5926 ata_host_resume(host
);
5929 #endif /* CONFIG_PCI */
5932 static int __init
ata_init(void)
5934 ata_probe_timeout
*= HZ
;
5935 ata_wq
= create_workqueue("ata");
5939 ata_aux_wq
= create_singlethread_workqueue("ata_aux");
5941 destroy_workqueue(ata_wq
);
5945 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5949 static void __exit
ata_exit(void)
5951 destroy_workqueue(ata_wq
);
5952 destroy_workqueue(ata_aux_wq
);
5955 module_init(ata_init
);
5956 module_exit(ata_exit
);
5958 static unsigned long ratelimit_time
;
5959 static DEFINE_SPINLOCK(ata_ratelimit_lock
);
5961 int ata_ratelimit(void)
5964 unsigned long flags
;
5966 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5968 if (time_after(jiffies
, ratelimit_time
)) {
5970 ratelimit_time
= jiffies
+ (HZ
/5);
5974 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5980 * ata_wait_register - wait until register value changes
5981 * @reg: IO-mapped register
5982 * @mask: Mask to apply to read register value
5983 * @val: Wait condition
5984 * @interval_msec: polling interval in milliseconds
5985 * @timeout_msec: timeout in milliseconds
5987 * Waiting for some bits of register to change is a common
5988 * operation for ATA controllers. This function reads 32bit LE
5989 * IO-mapped register @reg and tests for the following condition.
5991 * (*@reg & mask) != val
5993 * If the condition is met, it returns; otherwise, the process is
5994 * repeated after @interval_msec until timeout.
5997 * Kernel thread context (may sleep)
6000 * The final register value.
6002 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
6003 unsigned long interval_msec
,
6004 unsigned long timeout_msec
)
6006 unsigned long timeout
;
6009 tmp
= ioread32(reg
);
6011 /* Calculate timeout _after_ the first read to make sure
6012 * preceding writes reach the controller before starting to
6013 * eat away the timeout.
6015 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
6017 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
6018 msleep(interval_msec
);
6019 tmp
= ioread32(reg
);
6028 static void ata_dummy_noret(struct ata_port
*ap
) { }
6029 static int ata_dummy_ret0(struct ata_port
*ap
) { return 0; }
6030 static void ata_dummy_qc_noret(struct ata_queued_cmd
*qc
) { }
6032 static u8
ata_dummy_check_status(struct ata_port
*ap
)
6037 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd
*qc
)
6039 return AC_ERR_SYSTEM
;
6042 const struct ata_port_operations ata_dummy_port_ops
= {
6043 .port_disable
= ata_port_disable
,
6044 .check_status
= ata_dummy_check_status
,
6045 .check_altstatus
= ata_dummy_check_status
,
6046 .dev_select
= ata_noop_dev_select
,
6047 .qc_prep
= ata_noop_qc_prep
,
6048 .qc_issue
= ata_dummy_qc_issue
,
6049 .freeze
= ata_dummy_noret
,
6050 .thaw
= ata_dummy_noret
,
6051 .error_handler
= ata_dummy_noret
,
6052 .post_internal_cmd
= ata_dummy_qc_noret
,
6053 .irq_clear
= ata_dummy_noret
,
6054 .port_start
= ata_dummy_ret0
,
6055 .port_stop
= ata_dummy_noret
,
6059 * libata is essentially a library of internal helper functions for
6060 * low-level ATA host controller drivers. As such, the API/ABI is
6061 * likely to change as new drivers are added and updated.
6062 * Do not depend on ABI/API stability.
6065 EXPORT_SYMBOL_GPL(sata_deb_timing_normal
);
6066 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug
);
6067 EXPORT_SYMBOL_GPL(sata_deb_timing_long
);
6068 EXPORT_SYMBOL_GPL(ata_dummy_port_ops
);
6069 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
6070 EXPORT_SYMBOL_GPL(ata_std_ports
);
6071 EXPORT_SYMBOL_GPL(ata_host_init
);
6072 EXPORT_SYMBOL_GPL(ata_device_add
);
6073 EXPORT_SYMBOL_GPL(ata_port_detach
);
6074 EXPORT_SYMBOL_GPL(ata_host_remove
);
6075 EXPORT_SYMBOL_GPL(ata_sg_init
);
6076 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
6077 EXPORT_SYMBOL_GPL(ata_hsm_move
);
6078 EXPORT_SYMBOL_GPL(ata_qc_complete
);
6079 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple
);
6080 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
6081 EXPORT_SYMBOL_GPL(ata_tf_load
);
6082 EXPORT_SYMBOL_GPL(ata_tf_read
);
6083 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
6084 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
6085 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
6086 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
6087 EXPORT_SYMBOL_GPL(ata_check_status
);
6088 EXPORT_SYMBOL_GPL(ata_altstatus
);
6089 EXPORT_SYMBOL_GPL(ata_exec_command
);
6090 EXPORT_SYMBOL_GPL(ata_port_start
);
6091 EXPORT_SYMBOL_GPL(ata_port_stop
);
6092 EXPORT_SYMBOL_GPL(ata_host_stop
);
6093 EXPORT_SYMBOL_GPL(ata_interrupt
);
6094 EXPORT_SYMBOL_GPL(ata_mmio_data_xfer
);
6095 EXPORT_SYMBOL_GPL(ata_pio_data_xfer
);
6096 EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq
);
6097 EXPORT_SYMBOL_GPL(ata_qc_prep
);
6098 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
6099 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
6100 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
6101 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
6102 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
6103 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
6104 EXPORT_SYMBOL_GPL(ata_bmdma_freeze
);
6105 EXPORT_SYMBOL_GPL(ata_bmdma_thaw
);
6106 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh
);
6107 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler
);
6108 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd
);
6109 EXPORT_SYMBOL_GPL(ata_port_probe
);
6110 EXPORT_SYMBOL_GPL(sata_set_spd
);
6111 EXPORT_SYMBOL_GPL(sata_phy_debounce
);
6112 EXPORT_SYMBOL_GPL(sata_phy_resume
);
6113 EXPORT_SYMBOL_GPL(sata_phy_reset
);
6114 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
6115 EXPORT_SYMBOL_GPL(ata_bus_reset
);
6116 EXPORT_SYMBOL_GPL(ata_std_prereset
);
6117 EXPORT_SYMBOL_GPL(ata_std_softreset
);
6118 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
6119 EXPORT_SYMBOL_GPL(ata_std_postreset
);
6120 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
6121 EXPORT_SYMBOL_GPL(ata_dev_classify
);
6122 EXPORT_SYMBOL_GPL(ata_dev_pair
);
6123 EXPORT_SYMBOL_GPL(ata_port_disable
);
6124 EXPORT_SYMBOL_GPL(ata_ratelimit
);
6125 EXPORT_SYMBOL_GPL(ata_wait_register
);
6126 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
6127 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
6128 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
6129 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
6130 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
6131 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy
);
6132 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth
);
6133 EXPORT_SYMBOL_GPL(ata_scsi_release
);
6134 EXPORT_SYMBOL_GPL(ata_host_intr
);
6135 EXPORT_SYMBOL_GPL(sata_scr_valid
);
6136 EXPORT_SYMBOL_GPL(sata_scr_read
);
6137 EXPORT_SYMBOL_GPL(sata_scr_write
);
6138 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
6139 EXPORT_SYMBOL_GPL(ata_port_online
);
6140 EXPORT_SYMBOL_GPL(ata_port_offline
);
6141 EXPORT_SYMBOL_GPL(ata_host_suspend
);
6142 EXPORT_SYMBOL_GPL(ata_host_resume
);
6143 EXPORT_SYMBOL_GPL(ata_id_string
);
6144 EXPORT_SYMBOL_GPL(ata_id_c_string
);
6145 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
6147 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
6148 EXPORT_SYMBOL_GPL(ata_timing_compute
);
6149 EXPORT_SYMBOL_GPL(ata_timing_merge
);
6152 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
6153 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
6154 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
6155 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
6156 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
6157 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend
);
6158 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume
);
6159 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
6160 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
6161 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
6162 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
6163 #endif /* CONFIG_PCI */
6165 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
6166 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
6168 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
6169 EXPORT_SYMBOL_GPL(ata_port_schedule_eh
);
6170 EXPORT_SYMBOL_GPL(ata_port_abort
);
6171 EXPORT_SYMBOL_GPL(ata_port_freeze
);
6172 EXPORT_SYMBOL_GPL(ata_eh_freeze_port
);
6173 EXPORT_SYMBOL_GPL(ata_eh_thaw_port
);
6174 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
6175 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
6176 EXPORT_SYMBOL_GPL(ata_do_eh
);