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/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 /* debounce timing parameters in msecs { interval, duration, timeout } */
65 const unsigned long sata_deb_timing_boot
[] = { 5, 100, 2000 };
66 const unsigned long sata_deb_timing_eh
[] = { 25, 500, 2000 };
67 const unsigned long sata_deb_timing_before_fsrst
[] = { 100, 2000, 5000 };
69 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
70 u16 heads
, u16 sectors
);
71 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
);
72 static void ata_dev_xfermask(struct ata_device
*dev
);
74 static unsigned int ata_unique_id
= 1;
75 static struct workqueue_struct
*ata_wq
;
77 struct workqueue_struct
*ata_aux_wq
;
79 int atapi_enabled
= 1;
80 module_param(atapi_enabled
, int, 0444);
81 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
84 module_param(atapi_dmadir
, int, 0444);
85 MODULE_PARM_DESC(atapi_dmadir
, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
88 module_param_named(fua
, libata_fua
, int, 0444);
89 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
91 MODULE_AUTHOR("Jeff Garzik");
92 MODULE_DESCRIPTION("Library module for ATA devices");
93 MODULE_LICENSE("GPL");
94 MODULE_VERSION(DRV_VERSION
);
98 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
99 * @tf: Taskfile to convert
100 * @fis: Buffer into which data will output
101 * @pmp: Port multiplier port
103 * Converts a standard ATA taskfile to a Serial ATA
104 * FIS structure (Register - Host to Device).
107 * Inherited from caller.
110 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
112 fis
[0] = 0x27; /* Register - Host to Device FIS */
113 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
114 bit 7 indicates Command FIS */
115 fis
[2] = tf
->command
;
116 fis
[3] = tf
->feature
;
123 fis
[8] = tf
->hob_lbal
;
124 fis
[9] = tf
->hob_lbam
;
125 fis
[10] = tf
->hob_lbah
;
126 fis
[11] = tf
->hob_feature
;
129 fis
[13] = tf
->hob_nsect
;
140 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
141 * @fis: Buffer from which data will be input
142 * @tf: Taskfile to output
144 * Converts a serial ATA FIS structure to a standard ATA taskfile.
147 * Inherited from caller.
150 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
152 tf
->command
= fis
[2]; /* status */
153 tf
->feature
= fis
[3]; /* error */
160 tf
->hob_lbal
= fis
[8];
161 tf
->hob_lbam
= fis
[9];
162 tf
->hob_lbah
= fis
[10];
165 tf
->hob_nsect
= fis
[13];
168 static const u8 ata_rw_cmds
[] = {
172 ATA_CMD_READ_MULTI_EXT
,
173 ATA_CMD_WRITE_MULTI_EXT
,
177 ATA_CMD_WRITE_MULTI_FUA_EXT
,
181 ATA_CMD_PIO_READ_EXT
,
182 ATA_CMD_PIO_WRITE_EXT
,
195 ATA_CMD_WRITE_FUA_EXT
199 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
200 * @qc: command to examine and configure
202 * Examine the device configuration and tf->flags to calculate
203 * the proper read/write commands and protocol to use.
208 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
210 struct ata_taskfile
*tf
= &qc
->tf
;
211 struct ata_device
*dev
= qc
->dev
;
214 int index
, fua
, lba48
, write
;
216 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
217 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
218 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
220 if (dev
->flags
& ATA_DFLAG_PIO
) {
221 tf
->protocol
= ATA_PROT_PIO
;
222 index
= dev
->multi_count
? 0 : 8;
223 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
224 /* Unable to use DMA due to host limitation */
225 tf
->protocol
= ATA_PROT_PIO
;
226 index
= dev
->multi_count
? 0 : 8;
228 tf
->protocol
= ATA_PROT_DMA
;
232 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
241 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
242 * @pio_mask: pio_mask
243 * @mwdma_mask: mwdma_mask
244 * @udma_mask: udma_mask
246 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
247 * unsigned int xfer_mask.
255 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
256 unsigned int mwdma_mask
,
257 unsigned int udma_mask
)
259 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
260 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
261 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
265 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
266 * @xfer_mask: xfer_mask to unpack
267 * @pio_mask: resulting pio_mask
268 * @mwdma_mask: resulting mwdma_mask
269 * @udma_mask: resulting udma_mask
271 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
272 * Any NULL distination masks will be ignored.
274 static void ata_unpack_xfermask(unsigned int xfer_mask
,
275 unsigned int *pio_mask
,
276 unsigned int *mwdma_mask
,
277 unsigned int *udma_mask
)
280 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
282 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
284 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
287 static const struct ata_xfer_ent
{
291 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
292 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
293 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
298 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
299 * @xfer_mask: xfer_mask of interest
301 * Return matching XFER_* value for @xfer_mask. Only the highest
302 * bit of @xfer_mask is considered.
308 * Matching XFER_* value, 0 if no match found.
310 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
312 int highbit
= fls(xfer_mask
) - 1;
313 const struct ata_xfer_ent
*ent
;
315 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
316 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
317 return ent
->base
+ highbit
- ent
->shift
;
322 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
323 * @xfer_mode: XFER_* of interest
325 * Return matching xfer_mask for @xfer_mode.
331 * Matching xfer_mask, 0 if no match found.
333 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
335 const struct ata_xfer_ent
*ent
;
337 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
338 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
339 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
344 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
345 * @xfer_mode: XFER_* of interest
347 * Return matching xfer_shift for @xfer_mode.
353 * Matching xfer_shift, -1 if no match found.
355 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
357 const struct ata_xfer_ent
*ent
;
359 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
360 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
366 * ata_mode_string - convert xfer_mask to string
367 * @xfer_mask: mask of bits supported; only highest bit counts.
369 * Determine string which represents the highest speed
370 * (highest bit in @modemask).
376 * Constant C string representing highest speed listed in
377 * @mode_mask, or the constant C string "<n/a>".
379 static const char *ata_mode_string(unsigned int xfer_mask
)
381 static const char * const xfer_mode_str
[] = {
401 highbit
= fls(xfer_mask
) - 1;
402 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
403 return xfer_mode_str
[highbit
];
407 static const char *sata_spd_string(unsigned int spd
)
409 static const char * const spd_str
[] = {
414 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
416 return spd_str
[spd
- 1];
419 void ata_dev_disable(struct ata_device
*dev
)
421 if (ata_dev_enabled(dev
)) {
422 ata_dev_printk(dev
, KERN_WARNING
, "disabled\n");
428 * ata_pio_devchk - PATA device presence detection
429 * @ap: ATA channel to examine
430 * @device: Device to examine (starting at zero)
432 * This technique was originally described in
433 * Hale Landis's ATADRVR (www.ata-atapi.com), and
434 * later found its way into the ATA/ATAPI spec.
436 * Write a pattern to the ATA shadow registers,
437 * and if a device is present, it will respond by
438 * correctly storing and echoing back the
439 * ATA shadow register contents.
445 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
448 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
451 ap
->ops
->dev_select(ap
, device
);
453 outb(0x55, ioaddr
->nsect_addr
);
454 outb(0xaa, ioaddr
->lbal_addr
);
456 outb(0xaa, ioaddr
->nsect_addr
);
457 outb(0x55, ioaddr
->lbal_addr
);
459 outb(0x55, ioaddr
->nsect_addr
);
460 outb(0xaa, ioaddr
->lbal_addr
);
462 nsect
= inb(ioaddr
->nsect_addr
);
463 lbal
= inb(ioaddr
->lbal_addr
);
465 if ((nsect
== 0x55) && (lbal
== 0xaa))
466 return 1; /* we found a device */
468 return 0; /* nothing found */
472 * ata_mmio_devchk - PATA device presence detection
473 * @ap: ATA channel to examine
474 * @device: Device to examine (starting at zero)
476 * This technique was originally described in
477 * Hale Landis's ATADRVR (www.ata-atapi.com), and
478 * later found its way into the ATA/ATAPI spec.
480 * Write a pattern to the ATA shadow registers,
481 * and if a device is present, it will respond by
482 * correctly storing and echoing back the
483 * ATA shadow register contents.
489 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
492 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
495 ap
->ops
->dev_select(ap
, device
);
497 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
498 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
500 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
501 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
503 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
504 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
506 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
507 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
509 if ((nsect
== 0x55) && (lbal
== 0xaa))
510 return 1; /* we found a device */
512 return 0; /* nothing found */
516 * ata_devchk - PATA device presence detection
517 * @ap: ATA channel to examine
518 * @device: Device to examine (starting at zero)
520 * Dispatch ATA device presence detection, depending
521 * on whether we are using PIO or MMIO to talk to the
522 * ATA shadow registers.
528 static unsigned int ata_devchk(struct ata_port
*ap
,
531 if (ap
->flags
& ATA_FLAG_MMIO
)
532 return ata_mmio_devchk(ap
, device
);
533 return ata_pio_devchk(ap
, device
);
537 * ata_dev_classify - determine device type based on ATA-spec signature
538 * @tf: ATA taskfile register set for device to be identified
540 * Determine from taskfile register contents whether a device is
541 * ATA or ATAPI, as per "Signature and persistence" section
542 * of ATA/PI spec (volume 1, sect 5.14).
548 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
549 * the event of failure.
552 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
554 /* Apple's open source Darwin code hints that some devices only
555 * put a proper signature into the LBA mid/high registers,
556 * So, we only check those. It's sufficient for uniqueness.
559 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
560 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
561 DPRINTK("found ATA device by sig\n");
565 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
566 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
567 DPRINTK("found ATAPI device by sig\n");
568 return ATA_DEV_ATAPI
;
571 DPRINTK("unknown device\n");
572 return ATA_DEV_UNKNOWN
;
576 * ata_dev_try_classify - Parse returned ATA device signature
577 * @ap: ATA channel to examine
578 * @device: Device to examine (starting at zero)
579 * @r_err: Value of error register on completion
581 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
582 * an ATA/ATAPI-defined set of values is placed in the ATA
583 * shadow registers, indicating the results of device detection
586 * Select the ATA device, and read the values from the ATA shadow
587 * registers. Then parse according to the Error register value,
588 * and the spec-defined values examined by ata_dev_classify().
594 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
598 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
600 struct ata_taskfile tf
;
604 ap
->ops
->dev_select(ap
, device
);
606 memset(&tf
, 0, sizeof(tf
));
608 ap
->ops
->tf_read(ap
, &tf
);
613 /* see if device passed diags */
616 else if ((device
== 0) && (err
== 0x81))
621 /* determine if device is ATA or ATAPI */
622 class = ata_dev_classify(&tf
);
624 if (class == ATA_DEV_UNKNOWN
)
626 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
632 * ata_id_string - Convert IDENTIFY DEVICE page into string
633 * @id: IDENTIFY DEVICE results we will examine
634 * @s: string into which data is output
635 * @ofs: offset into identify device page
636 * @len: length of string to return. must be an even number.
638 * The strings in the IDENTIFY DEVICE page are broken up into
639 * 16-bit chunks. Run through the string, and output each
640 * 8-bit chunk linearly, regardless of platform.
646 void ata_id_string(const u16
*id
, unsigned char *s
,
647 unsigned int ofs
, unsigned int len
)
666 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
667 * @id: IDENTIFY DEVICE results we will examine
668 * @s: string into which data is output
669 * @ofs: offset into identify device page
670 * @len: length of string to return. must be an odd number.
672 * This function is identical to ata_id_string except that it
673 * trims trailing spaces and terminates the resulting string with
674 * null. @len must be actual maximum length (even number) + 1.
679 void ata_id_c_string(const u16
*id
, unsigned char *s
,
680 unsigned int ofs
, unsigned int len
)
686 ata_id_string(id
, s
, ofs
, len
- 1);
688 p
= s
+ strnlen(s
, len
- 1);
689 while (p
> s
&& p
[-1] == ' ')
694 static u64
ata_id_n_sectors(const u16
*id
)
696 if (ata_id_has_lba(id
)) {
697 if (ata_id_has_lba48(id
))
698 return ata_id_u64(id
, 100);
700 return ata_id_u32(id
, 60);
702 if (ata_id_current_chs_valid(id
))
703 return ata_id_u32(id
, 57);
705 return id
[1] * id
[3] * id
[6];
710 * ata_noop_dev_select - Select device 0/1 on ATA bus
711 * @ap: ATA channel to manipulate
712 * @device: ATA device (numbered from zero) to select
714 * This function performs no actual function.
716 * May be used as the dev_select() entry in ata_port_operations.
721 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
727 * ata_std_dev_select - Select device 0/1 on ATA bus
728 * @ap: ATA channel to manipulate
729 * @device: ATA device (numbered from zero) to select
731 * Use the method defined in the ATA specification to
732 * make either device 0, or device 1, active on the
733 * ATA channel. Works with both PIO and MMIO.
735 * May be used as the dev_select() entry in ata_port_operations.
741 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
746 tmp
= ATA_DEVICE_OBS
;
748 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
750 if (ap
->flags
& ATA_FLAG_MMIO
) {
751 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
753 outb(tmp
, ap
->ioaddr
.device_addr
);
755 ata_pause(ap
); /* needed; also flushes, for mmio */
759 * ata_dev_select - Select device 0/1 on ATA bus
760 * @ap: ATA channel to manipulate
761 * @device: ATA device (numbered from zero) to select
762 * @wait: non-zero to wait for Status register BSY bit to clear
763 * @can_sleep: non-zero if context allows sleeping
765 * Use the method defined in the ATA specification to
766 * make either device 0, or device 1, active on the
769 * This is a high-level version of ata_std_dev_select(),
770 * which additionally provides the services of inserting
771 * the proper pauses and status polling, where needed.
777 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
778 unsigned int wait
, unsigned int can_sleep
)
780 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
781 ap
->id
, device
, wait
);
786 ap
->ops
->dev_select(ap
, device
);
789 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
796 * ata_dump_id - IDENTIFY DEVICE info debugging output
797 * @id: IDENTIFY DEVICE page to dump
799 * Dump selected 16-bit words from the given IDENTIFY DEVICE
806 static inline void ata_dump_id(const u16
*id
)
808 DPRINTK("49==0x%04x "
818 DPRINTK("80==0x%04x "
828 DPRINTK("88==0x%04x "
835 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
836 * @id: IDENTIFY data to compute xfer mask from
838 * Compute the xfermask for this device. This is not as trivial
839 * as it seems if we must consider early devices correctly.
841 * FIXME: pre IDE drive timing (do we care ?).
849 static unsigned int ata_id_xfermask(const u16
*id
)
851 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
853 /* Usual case. Word 53 indicates word 64 is valid */
854 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
855 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
859 /* If word 64 isn't valid then Word 51 high byte holds
860 * the PIO timing number for the maximum. Turn it into
863 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
865 /* But wait.. there's more. Design your standards by
866 * committee and you too can get a free iordy field to
867 * process. However its the speeds not the modes that
868 * are supported... Note drivers using the timing API
869 * will get this right anyway
873 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
876 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
877 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
879 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
883 * ata_port_queue_task - Queue port_task
884 * @ap: The ata_port to queue port_task for
885 * @fn: workqueue function to be scheduled
886 * @data: data value to pass to workqueue function
887 * @delay: delay time for workqueue function
889 * Schedule @fn(@data) for execution after @delay jiffies using
890 * port_task. There is one port_task per port and it's the
891 * user(low level driver)'s responsibility to make sure that only
892 * one task is active at any given time.
894 * libata core layer takes care of synchronization between
895 * port_task and EH. ata_port_queue_task() may be ignored for EH
899 * Inherited from caller.
901 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
906 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
909 PREPARE_WORK(&ap
->port_task
, fn
, data
);
912 rc
= queue_work(ata_wq
, &ap
->port_task
);
914 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
916 /* rc == 0 means that another user is using port task */
921 * ata_port_flush_task - Flush port_task
922 * @ap: The ata_port to flush port_task for
924 * After this function completes, port_task is guranteed not to
925 * be running or scheduled.
928 * Kernel thread context (may sleep)
930 void ata_port_flush_task(struct ata_port
*ap
)
936 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
937 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
938 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
940 DPRINTK("flush #1\n");
941 flush_workqueue(ata_wq
);
944 * At this point, if a task is running, it's guaranteed to see
945 * the FLUSH flag; thus, it will never queue pio tasks again.
948 if (!cancel_delayed_work(&ap
->port_task
)) {
949 DPRINTK("flush #2\n");
950 flush_workqueue(ata_wq
);
953 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
954 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
955 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
960 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
962 struct completion
*waiting
= qc
->private_data
;
968 * ata_exec_internal - execute libata internal command
969 * @dev: Device to which the command is sent
970 * @tf: Taskfile registers for the command and the result
971 * @cdb: CDB for packet command
972 * @dma_dir: Data tranfer direction of the command
973 * @buf: Data buffer of the command
974 * @buflen: Length of data buffer
976 * Executes libata internal command with timeout. @tf contains
977 * command on entry and result on return. Timeout and error
978 * conditions are reported via return value. No recovery action
979 * is taken after a command times out. It's caller's duty to
980 * clean up after timeout.
983 * None. Should be called with kernel context, might sleep.
986 * Zero on success, AC_ERR_* mask on failure
988 unsigned ata_exec_internal(struct ata_device
*dev
,
989 struct ata_taskfile
*tf
, const u8
*cdb
,
990 int dma_dir
, void *buf
, unsigned int buflen
)
992 struct ata_port
*ap
= dev
->ap
;
993 u8 command
= tf
->command
;
994 struct ata_queued_cmd
*qc
;
995 unsigned int tag
, preempted_tag
;
996 u32 preempted_sactive
, preempted_qc_active
;
997 DECLARE_COMPLETION(wait
);
999 unsigned int err_mask
;
1002 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1004 /* no internal command while frozen */
1005 if (ap
->flags
& ATA_FLAG_FROZEN
) {
1006 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1007 return AC_ERR_SYSTEM
;
1010 /* initialize internal qc */
1012 /* XXX: Tag 0 is used for drivers with legacy EH as some
1013 * drivers choke if any other tag is given. This breaks
1014 * ata_tag_internal() test for those drivers. Don't use new
1015 * EH stuff without converting to it.
1017 if (ap
->ops
->error_handler
)
1018 tag
= ATA_TAG_INTERNAL
;
1022 if (test_and_set_bit(tag
, &ap
->qc_allocated
))
1024 qc
= __ata_qc_from_tag(ap
, tag
);
1032 preempted_tag
= ap
->active_tag
;
1033 preempted_sactive
= ap
->sactive
;
1034 preempted_qc_active
= ap
->qc_active
;
1035 ap
->active_tag
= ATA_TAG_POISON
;
1039 /* prepare & issue qc */
1042 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1043 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1044 qc
->dma_dir
= dma_dir
;
1045 if (dma_dir
!= DMA_NONE
) {
1046 ata_sg_init_one(qc
, buf
, buflen
);
1047 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1050 qc
->private_data
= &wait
;
1051 qc
->complete_fn
= ata_qc_complete_internal
;
1055 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1057 rc
= wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
);
1059 ata_port_flush_task(ap
);
1062 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1064 /* We're racing with irq here. If we lose, the
1065 * following test prevents us from completing the qc
1066 * twice. If we win, the port is frozen and will be
1067 * cleaned up by ->post_internal_cmd().
1069 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1070 qc
->err_mask
|= AC_ERR_TIMEOUT
;
1072 if (ap
->ops
->error_handler
)
1073 ata_port_freeze(ap
);
1075 ata_qc_complete(qc
);
1077 ata_dev_printk(dev
, KERN_WARNING
,
1078 "qc timeout (cmd 0x%x)\n", command
);
1081 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1084 /* do post_internal_cmd */
1085 if (ap
->ops
->post_internal_cmd
)
1086 ap
->ops
->post_internal_cmd(qc
);
1088 if (qc
->flags
& ATA_QCFLAG_FAILED
&& !qc
->err_mask
) {
1089 ata_dev_printk(dev
, KERN_WARNING
, "zero err_mask for failed "
1090 "internal command, assuming AC_ERR_OTHER\n");
1091 qc
->err_mask
|= AC_ERR_OTHER
;
1095 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1097 *tf
= qc
->result_tf
;
1098 err_mask
= qc
->err_mask
;
1101 ap
->active_tag
= preempted_tag
;
1102 ap
->sactive
= preempted_sactive
;
1103 ap
->qc_active
= preempted_qc_active
;
1105 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1106 * Until those drivers are fixed, we detect the condition
1107 * here, fail the command with AC_ERR_SYSTEM and reenable the
1110 * Note that this doesn't change any behavior as internal
1111 * command failure results in disabling the device in the
1112 * higher layer for LLDDs without new reset/EH callbacks.
1114 * Kill the following code as soon as those drivers are fixed.
1116 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1117 err_mask
|= AC_ERR_SYSTEM
;
1121 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1127 * ata_pio_need_iordy - check if iordy needed
1130 * Check if the current speed of the device requires IORDY. Used
1131 * by various controllers for chip configuration.
1134 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1137 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1144 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1146 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1147 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1148 /* Is the speed faster than the drive allows non IORDY ? */
1150 /* This is cycle times not frequency - watch the logic! */
1151 if (pio
> 240) /* PIO2 is 240nS per cycle */
1160 * ata_dev_read_id - Read ID data from the specified device
1161 * @dev: target device
1162 * @p_class: pointer to class of the target device (may be changed)
1163 * @post_reset: is this read ID post-reset?
1164 * @id: buffer to read IDENTIFY data into
1166 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1167 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1168 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1169 * for pre-ATA4 drives.
1172 * Kernel thread context (may sleep)
1175 * 0 on success, -errno otherwise.
1177 int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1178 int post_reset
, u16
*id
)
1180 struct ata_port
*ap
= dev
->ap
;
1181 unsigned int class = *p_class
;
1182 struct ata_taskfile tf
;
1183 unsigned int err_mask
= 0;
1187 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1189 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1192 ata_tf_init(dev
, &tf
);
1196 tf
.command
= ATA_CMD_ID_ATA
;
1199 tf
.command
= ATA_CMD_ID_ATAPI
;
1203 reason
= "unsupported class";
1207 tf
.protocol
= ATA_PROT_PIO
;
1209 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1210 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1213 reason
= "I/O error";
1217 swap_buf_le16(id
, ATA_ID_WORDS
);
1220 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1222 reason
= "device reports illegal type";
1226 if (post_reset
&& class == ATA_DEV_ATA
) {
1228 * The exact sequence expected by certain pre-ATA4 drives is:
1231 * INITIALIZE DEVICE PARAMETERS
1233 * Some drives were very specific about that exact sequence.
1235 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1236 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1239 reason
= "INIT_DEV_PARAMS failed";
1243 /* current CHS translation info (id[53-58]) might be
1244 * changed. reread the identify device info.
1256 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1257 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1261 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1263 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1266 static void ata_dev_config_ncq(struct ata_device
*dev
,
1267 char *desc
, size_t desc_sz
)
1269 struct ata_port
*ap
= dev
->ap
;
1270 int hdepth
= 0, ddepth
= ata_id_queue_depth(dev
->id
);
1272 if (!ata_id_has_ncq(dev
->id
)) {
1277 if (ap
->flags
& ATA_FLAG_NCQ
) {
1278 hdepth
= min(ap
->host
->can_queue
, ATA_MAX_QUEUE
- 1);
1279 dev
->flags
|= ATA_DFLAG_NCQ
;
1282 if (hdepth
>= ddepth
)
1283 snprintf(desc
, desc_sz
, "NCQ (depth %d)", ddepth
);
1285 snprintf(desc
, desc_sz
, "NCQ (depth %d/%d)", hdepth
, ddepth
);
1289 * ata_dev_configure - Configure the specified ATA/ATAPI device
1290 * @dev: Target device to configure
1291 * @print_info: Enable device info printout
1293 * Configure @dev according to @dev->id. Generic and low-level
1294 * driver specific fixups are also applied.
1297 * Kernel thread context (may sleep)
1300 * 0 on success, -errno otherwise
1302 int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1304 struct ata_port
*ap
= dev
->ap
;
1305 const u16
*id
= dev
->id
;
1306 unsigned int xfer_mask
;
1309 if (!ata_dev_enabled(dev
)) {
1310 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1311 ap
->id
, dev
->devno
);
1315 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1317 /* print device capabilities */
1319 ata_dev_printk(dev
, KERN_DEBUG
, "cfg 49:%04x 82:%04x 83:%04x "
1320 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1321 id
[49], id
[82], id
[83], id
[84],
1322 id
[85], id
[86], id
[87], id
[88]);
1324 /* initialize to-be-configured parameters */
1325 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1326 dev
->max_sectors
= 0;
1334 * common ATA, ATAPI feature tests
1337 /* find max transfer mode; for printk only */
1338 xfer_mask
= ata_id_xfermask(id
);
1342 /* ATA-specific feature tests */
1343 if (dev
->class == ATA_DEV_ATA
) {
1344 dev
->n_sectors
= ata_id_n_sectors(id
);
1346 if (ata_id_has_lba(id
)) {
1347 const char *lba_desc
;
1351 dev
->flags
|= ATA_DFLAG_LBA
;
1352 if (ata_id_has_lba48(id
)) {
1353 dev
->flags
|= ATA_DFLAG_LBA48
;
1358 ata_dev_config_ncq(dev
, ncq_desc
, sizeof(ncq_desc
));
1360 /* print device info to dmesg */
1362 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1363 "max %s, %Lu sectors: %s %s\n",
1364 ata_id_major_version(id
),
1365 ata_mode_string(xfer_mask
),
1366 (unsigned long long)dev
->n_sectors
,
1367 lba_desc
, ncq_desc
);
1371 /* Default translation */
1372 dev
->cylinders
= id
[1];
1374 dev
->sectors
= id
[6];
1376 if (ata_id_current_chs_valid(id
)) {
1377 /* Current CHS translation is valid. */
1378 dev
->cylinders
= id
[54];
1379 dev
->heads
= id
[55];
1380 dev
->sectors
= id
[56];
1383 /* print device info to dmesg */
1385 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1386 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1387 ata_id_major_version(id
),
1388 ata_mode_string(xfer_mask
),
1389 (unsigned long long)dev
->n_sectors
,
1390 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1393 if (dev
->id
[59] & 0x100) {
1394 dev
->multi_count
= dev
->id
[59] & 0xff;
1395 DPRINTK("ata%u: dev %u multi count %u\n",
1396 ap
->id
, dev
->devno
, dev
->multi_count
);
1402 /* ATAPI-specific feature tests */
1403 else if (dev
->class == ATA_DEV_ATAPI
) {
1404 char *cdb_intr_string
= "";
1406 rc
= atapi_cdb_len(id
);
1407 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1408 ata_dev_printk(dev
, KERN_WARNING
,
1409 "unsupported CDB len\n");
1413 dev
->cdb_len
= (unsigned int) rc
;
1415 if (ata_id_cdb_intr(dev
->id
)) {
1416 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1417 cdb_intr_string
= ", CDB intr";
1420 /* print device info to dmesg */
1422 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s%s\n",
1423 ata_mode_string(xfer_mask
),
1427 ap
->host
->max_cmd_len
= 0;
1428 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1429 ap
->host
->max_cmd_len
= max_t(unsigned int,
1430 ap
->host
->max_cmd_len
,
1431 ap
->device
[i
].cdb_len
);
1433 /* limit bridge transfers to udma5, 200 sectors */
1434 if (ata_dev_knobble(dev
)) {
1436 ata_dev_printk(dev
, KERN_INFO
,
1437 "applying bridge limits\n");
1438 dev
->udma_mask
&= ATA_UDMA5
;
1439 dev
->max_sectors
= ATA_MAX_SECTORS
;
1442 if (ap
->ops
->dev_config
)
1443 ap
->ops
->dev_config(ap
, dev
);
1445 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1449 DPRINTK("EXIT, err\n");
1454 * ata_bus_probe - Reset and probe ATA bus
1457 * Master ATA bus probing function. Initiates a hardware-dependent
1458 * bus reset, then attempts to identify any devices found on
1462 * PCI/etc. bus probe sem.
1465 * Zero on success, negative errno otherwise.
1468 static int ata_bus_probe(struct ata_port
*ap
)
1470 unsigned int classes
[ATA_MAX_DEVICES
];
1471 int tries
[ATA_MAX_DEVICES
];
1472 int i
, rc
, down_xfermask
;
1473 struct ata_device
*dev
;
1477 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1478 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1483 /* reset and determine device classes */
1484 ap
->ops
->phy_reset(ap
);
1486 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1487 dev
= &ap
->device
[i
];
1489 if (!(ap
->flags
& ATA_FLAG_DISABLED
) &&
1490 dev
->class != ATA_DEV_UNKNOWN
)
1491 classes
[dev
->devno
] = dev
->class;
1493 classes
[dev
->devno
] = ATA_DEV_NONE
;
1495 dev
->class = ATA_DEV_UNKNOWN
;
1500 /* after the reset the device state is PIO 0 and the controller
1501 state is undefined. Record the mode */
1503 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1504 ap
->device
[i
].pio_mode
= XFER_PIO_0
;
1506 /* read IDENTIFY page and configure devices */
1507 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1508 dev
= &ap
->device
[i
];
1511 dev
->class = classes
[i
];
1513 if (!ata_dev_enabled(dev
))
1516 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1520 rc
= ata_dev_configure(dev
, 1);
1525 /* configure transfer mode */
1526 rc
= ata_set_mode(ap
, &dev
);
1532 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1533 if (ata_dev_enabled(&ap
->device
[i
]))
1536 /* no device present, disable port */
1537 ata_port_disable(ap
);
1538 ap
->ops
->port_disable(ap
);
1545 tries
[dev
->devno
] = 0;
1548 sata_down_spd_limit(ap
);
1551 tries
[dev
->devno
]--;
1552 if (down_xfermask
&&
1553 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1554 tries
[dev
->devno
] = 0;
1557 if (!tries
[dev
->devno
]) {
1558 ata_down_xfermask_limit(dev
, 1);
1559 ata_dev_disable(dev
);
1566 * ata_port_probe - Mark port as enabled
1567 * @ap: Port for which we indicate enablement
1569 * Modify @ap data structure such that the system
1570 * thinks that the entire port is enabled.
1572 * LOCKING: host_set lock, or some other form of
1576 void ata_port_probe(struct ata_port
*ap
)
1578 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1582 * sata_print_link_status - Print SATA link status
1583 * @ap: SATA port to printk link status about
1585 * This function prints link speed and status of a SATA link.
1590 static void sata_print_link_status(struct ata_port
*ap
)
1592 u32 sstatus
, scontrol
, tmp
;
1594 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1596 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1598 if (ata_port_online(ap
)) {
1599 tmp
= (sstatus
>> 4) & 0xf;
1600 ata_port_printk(ap
, KERN_INFO
,
1601 "SATA link up %s (SStatus %X SControl %X)\n",
1602 sata_spd_string(tmp
), sstatus
, scontrol
);
1604 ata_port_printk(ap
, KERN_INFO
,
1605 "SATA link down (SStatus %X SControl %X)\n",
1611 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1612 * @ap: SATA port associated with target SATA PHY.
1614 * This function issues commands to standard SATA Sxxx
1615 * PHY registers, to wake up the phy (and device), and
1616 * clear any reset condition.
1619 * PCI/etc. bus probe sem.
1622 void __sata_phy_reset(struct ata_port
*ap
)
1625 unsigned long timeout
= jiffies
+ (HZ
* 5);
1627 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1628 /* issue phy wake/reset */
1629 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1630 /* Couldn't find anything in SATA I/II specs, but
1631 * AHCI-1.1 10.4.2 says at least 1 ms. */
1634 /* phy wake/clear reset */
1635 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1637 /* wait for phy to become ready, if necessary */
1640 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1641 if ((sstatus
& 0xf) != 1)
1643 } while (time_before(jiffies
, timeout
));
1645 /* print link status */
1646 sata_print_link_status(ap
);
1648 /* TODO: phy layer with polling, timeouts, etc. */
1649 if (!ata_port_offline(ap
))
1652 ata_port_disable(ap
);
1654 if (ap
->flags
& ATA_FLAG_DISABLED
)
1657 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1658 ata_port_disable(ap
);
1662 ap
->cbl
= ATA_CBL_SATA
;
1666 * sata_phy_reset - Reset SATA bus.
1667 * @ap: SATA port associated with target SATA PHY.
1669 * This function resets the SATA bus, and then probes
1670 * the bus for devices.
1673 * PCI/etc. bus probe sem.
1676 void sata_phy_reset(struct ata_port
*ap
)
1678 __sata_phy_reset(ap
);
1679 if (ap
->flags
& ATA_FLAG_DISABLED
)
1685 * ata_dev_pair - return other device on cable
1688 * Obtain the other device on the same cable, or if none is
1689 * present NULL is returned
1692 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1694 struct ata_port
*ap
= adev
->ap
;
1695 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1696 if (!ata_dev_enabled(pair
))
1702 * ata_port_disable - Disable port.
1703 * @ap: Port to be disabled.
1705 * Modify @ap data structure such that the system
1706 * thinks that the entire port is disabled, and should
1707 * never attempt to probe or communicate with devices
1710 * LOCKING: host_set lock, or some other form of
1714 void ata_port_disable(struct ata_port
*ap
)
1716 ap
->device
[0].class = ATA_DEV_NONE
;
1717 ap
->device
[1].class = ATA_DEV_NONE
;
1718 ap
->flags
|= ATA_FLAG_DISABLED
;
1722 * sata_down_spd_limit - adjust SATA spd limit downward
1723 * @ap: Port to adjust SATA spd limit for
1725 * Adjust SATA spd limit of @ap downward. Note that this
1726 * function only adjusts the limit. The change must be applied
1727 * using sata_set_spd().
1730 * Inherited from caller.
1733 * 0 on success, negative errno on failure
1735 int sata_down_spd_limit(struct ata_port
*ap
)
1737 u32 sstatus
, spd
, mask
;
1740 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1744 mask
= ap
->sata_spd_limit
;
1747 highbit
= fls(mask
) - 1;
1748 mask
&= ~(1 << highbit
);
1750 spd
= (sstatus
>> 4) & 0xf;
1754 mask
&= (1 << spd
) - 1;
1758 ap
->sata_spd_limit
= mask
;
1760 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1761 sata_spd_string(fls(mask
)));
1766 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1770 if (ap
->sata_spd_limit
== UINT_MAX
)
1773 limit
= fls(ap
->sata_spd_limit
);
1775 spd
= (*scontrol
>> 4) & 0xf;
1776 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1778 return spd
!= limit
;
1782 * sata_set_spd_needed - is SATA spd configuration needed
1783 * @ap: Port in question
1785 * Test whether the spd limit in SControl matches
1786 * @ap->sata_spd_limit. This function is used to determine
1787 * whether hardreset is necessary to apply SATA spd
1791 * Inherited from caller.
1794 * 1 if SATA spd configuration is needed, 0 otherwise.
1796 int sata_set_spd_needed(struct ata_port
*ap
)
1800 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1803 return __sata_set_spd_needed(ap
, &scontrol
);
1807 * sata_set_spd - set SATA spd according to spd limit
1808 * @ap: Port to set SATA spd for
1810 * Set SATA spd of @ap according to sata_spd_limit.
1813 * Inherited from caller.
1816 * 0 if spd doesn't need to be changed, 1 if spd has been
1817 * changed. Negative errno if SCR registers are inaccessible.
1819 int sata_set_spd(struct ata_port
*ap
)
1824 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1827 if (!__sata_set_spd_needed(ap
, &scontrol
))
1830 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1837 * This mode timing computation functionality is ported over from
1838 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1841 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1842 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1843 * for PIO 5, which is a nonstandard extension and UDMA6, which
1844 * is currently supported only by Maxtor drives.
1847 static const struct ata_timing ata_timing
[] = {
1849 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1850 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1851 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1852 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1854 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1855 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1856 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1858 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1860 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1861 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1862 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1864 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1865 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1866 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1868 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1869 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1870 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1872 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1873 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1874 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1876 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1881 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1882 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1884 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1886 q
->setup
= EZ(t
->setup
* 1000, T
);
1887 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1888 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1889 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1890 q
->active
= EZ(t
->active
* 1000, T
);
1891 q
->recover
= EZ(t
->recover
* 1000, T
);
1892 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1893 q
->udma
= EZ(t
->udma
* 1000, UT
);
1896 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1897 struct ata_timing
*m
, unsigned int what
)
1899 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1900 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1901 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1902 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1903 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1904 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1905 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1906 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1909 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1911 const struct ata_timing
*t
;
1913 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1914 if (t
->mode
== 0xFF)
1919 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1920 struct ata_timing
*t
, int T
, int UT
)
1922 const struct ata_timing
*s
;
1923 struct ata_timing p
;
1929 if (!(s
= ata_timing_find_mode(speed
)))
1932 memcpy(t
, s
, sizeof(*s
));
1935 * If the drive is an EIDE drive, it can tell us it needs extended
1936 * PIO/MW_DMA cycle timing.
1939 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1940 memset(&p
, 0, sizeof(p
));
1941 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1942 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1943 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1944 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1945 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1947 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1951 * Convert the timing to bus clock counts.
1954 ata_timing_quantize(t
, t
, T
, UT
);
1957 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1958 * S.M.A.R.T * and some other commands. We have to ensure that the
1959 * DMA cycle timing is slower/equal than the fastest PIO timing.
1962 if (speed
> XFER_PIO_4
) {
1963 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1964 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1968 * Lengthen active & recovery time so that cycle time is correct.
1971 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1972 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1973 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1976 if (t
->active
+ t
->recover
< t
->cycle
) {
1977 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1978 t
->recover
= t
->cycle
- t
->active
;
1985 * ata_down_xfermask_limit - adjust dev xfer masks downward
1986 * @dev: Device to adjust xfer masks
1987 * @force_pio0: Force PIO0
1989 * Adjust xfer masks of @dev downward. Note that this function
1990 * does not apply the change. Invoking ata_set_mode() afterwards
1991 * will apply the limit.
1994 * Inherited from caller.
1997 * 0 on success, negative errno on failure
1999 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
2001 unsigned long xfer_mask
;
2004 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
2009 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2010 if (xfer_mask
& ATA_MASK_UDMA
)
2011 xfer_mask
&= ~ATA_MASK_MWDMA
;
2013 highbit
= fls(xfer_mask
) - 1;
2014 xfer_mask
&= ~(1 << highbit
);
2016 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
2020 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2023 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
2024 ata_mode_string(xfer_mask
));
2032 static int ata_dev_set_mode(struct ata_device
*dev
)
2034 unsigned int err_mask
;
2037 dev
->flags
&= ~ATA_DFLAG_PIO
;
2038 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
2039 dev
->flags
|= ATA_DFLAG_PIO
;
2041 err_mask
= ata_dev_set_xfermode(dev
);
2043 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
2044 "(err_mask=0x%x)\n", err_mask
);
2048 rc
= ata_dev_revalidate(dev
, 0);
2052 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2053 dev
->xfer_shift
, (int)dev
->xfer_mode
);
2055 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
2056 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
2061 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2062 * @ap: port on which timings will be programmed
2063 * @r_failed_dev: out paramter for failed device
2065 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2066 * ata_set_mode() fails, pointer to the failing device is
2067 * returned in @r_failed_dev.
2070 * PCI/etc. bus probe sem.
2073 * 0 on success, negative errno otherwise
2075 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2077 struct ata_device
*dev
;
2078 int i
, rc
= 0, used_dma
= 0, found
= 0;
2080 /* has private set_mode? */
2081 if (ap
->ops
->set_mode
) {
2082 /* FIXME: make ->set_mode handle no device case and
2083 * return error code and failing device on failure.
2085 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2086 if (ata_dev_enabled(&ap
->device
[i
])) {
2087 ap
->ops
->set_mode(ap
);
2094 /* step 1: calculate xfer_mask */
2095 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2096 unsigned int pio_mask
, dma_mask
;
2098 dev
= &ap
->device
[i
];
2100 if (!ata_dev_enabled(dev
))
2103 ata_dev_xfermask(dev
);
2105 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2106 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2107 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2108 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2117 /* step 2: always set host PIO timings */
2118 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2119 dev
= &ap
->device
[i
];
2120 if (!ata_dev_enabled(dev
))
2123 if (!dev
->pio_mode
) {
2124 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2129 dev
->xfer_mode
= dev
->pio_mode
;
2130 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2131 if (ap
->ops
->set_piomode
)
2132 ap
->ops
->set_piomode(ap
, dev
);
2135 /* step 3: set host DMA timings */
2136 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2137 dev
= &ap
->device
[i
];
2139 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2142 dev
->xfer_mode
= dev
->dma_mode
;
2143 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2144 if (ap
->ops
->set_dmamode
)
2145 ap
->ops
->set_dmamode(ap
, dev
);
2148 /* step 4: update devices' xfer mode */
2149 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2150 dev
= &ap
->device
[i
];
2152 if (!ata_dev_enabled(dev
))
2155 rc
= ata_dev_set_mode(dev
);
2160 /* Record simplex status. If we selected DMA then the other
2161 * host channels are not permitted to do so.
2163 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2164 ap
->host_set
->simplex_claimed
= 1;
2166 /* step5: chip specific finalisation */
2167 if (ap
->ops
->post_set_mode
)
2168 ap
->ops
->post_set_mode(ap
);
2172 *r_failed_dev
= dev
;
2177 * ata_tf_to_host - issue ATA taskfile to host controller
2178 * @ap: port to which command is being issued
2179 * @tf: ATA taskfile register set
2181 * Issues ATA taskfile register set to ATA host controller,
2182 * with proper synchronization with interrupt handler and
2186 * spin_lock_irqsave(host_set lock)
2189 static inline void ata_tf_to_host(struct ata_port
*ap
,
2190 const struct ata_taskfile
*tf
)
2192 ap
->ops
->tf_load(ap
, tf
);
2193 ap
->ops
->exec_command(ap
, tf
);
2197 * ata_busy_sleep - sleep until BSY clears, or timeout
2198 * @ap: port containing status register to be polled
2199 * @tmout_pat: impatience timeout
2200 * @tmout: overall timeout
2202 * Sleep until ATA Status register bit BSY clears,
2203 * or a timeout occurs.
2208 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2209 unsigned long tmout_pat
, unsigned long tmout
)
2211 unsigned long timer_start
, timeout
;
2214 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2215 timer_start
= jiffies
;
2216 timeout
= timer_start
+ tmout_pat
;
2217 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2219 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2222 if (status
& ATA_BUSY
)
2223 ata_port_printk(ap
, KERN_WARNING
,
2224 "port is slow to respond, please be patient\n");
2226 timeout
= timer_start
+ tmout
;
2227 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2229 status
= ata_chk_status(ap
);
2232 if (status
& ATA_BUSY
) {
2233 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2234 "(%lu secs)\n", tmout
/ HZ
);
2241 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2243 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2244 unsigned int dev0
= devmask
& (1 << 0);
2245 unsigned int dev1
= devmask
& (1 << 1);
2246 unsigned long timeout
;
2248 /* if device 0 was found in ata_devchk, wait for its
2252 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2254 /* if device 1 was found in ata_devchk, wait for
2255 * register access, then wait for BSY to clear
2257 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2261 ap
->ops
->dev_select(ap
, 1);
2262 if (ap
->flags
& ATA_FLAG_MMIO
) {
2263 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2264 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2266 nsect
= inb(ioaddr
->nsect_addr
);
2267 lbal
= inb(ioaddr
->lbal_addr
);
2269 if ((nsect
== 1) && (lbal
== 1))
2271 if (time_after(jiffies
, timeout
)) {
2275 msleep(50); /* give drive a breather */
2278 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2280 /* is all this really necessary? */
2281 ap
->ops
->dev_select(ap
, 0);
2283 ap
->ops
->dev_select(ap
, 1);
2285 ap
->ops
->dev_select(ap
, 0);
2288 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2289 unsigned int devmask
)
2291 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2293 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2295 /* software reset. causes dev0 to be selected */
2296 if (ap
->flags
& ATA_FLAG_MMIO
) {
2297 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2298 udelay(20); /* FIXME: flush */
2299 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2300 udelay(20); /* FIXME: flush */
2301 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2303 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2305 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2307 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2310 /* spec mandates ">= 2ms" before checking status.
2311 * We wait 150ms, because that was the magic delay used for
2312 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2313 * between when the ATA command register is written, and then
2314 * status is checked. Because waiting for "a while" before
2315 * checking status is fine, post SRST, we perform this magic
2316 * delay here as well.
2318 * Old drivers/ide uses the 2mS rule and then waits for ready
2322 /* Before we perform post reset processing we want to see if
2323 * the bus shows 0xFF because the odd clown forgets the D7
2324 * pulldown resistor.
2326 if (ata_check_status(ap
) == 0xFF) {
2327 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2328 return AC_ERR_OTHER
;
2331 ata_bus_post_reset(ap
, devmask
);
2337 * ata_bus_reset - reset host port and associated ATA channel
2338 * @ap: port to reset
2340 * This is typically the first time we actually start issuing
2341 * commands to the ATA channel. We wait for BSY to clear, then
2342 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2343 * result. Determine what devices, if any, are on the channel
2344 * by looking at the device 0/1 error register. Look at the signature
2345 * stored in each device's taskfile registers, to determine if
2346 * the device is ATA or ATAPI.
2349 * PCI/etc. bus probe sem.
2350 * Obtains host_set lock.
2353 * Sets ATA_FLAG_DISABLED if bus reset fails.
2356 void ata_bus_reset(struct ata_port
*ap
)
2358 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2359 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2361 unsigned int dev0
, dev1
= 0, devmask
= 0;
2363 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2365 /* determine if device 0/1 are present */
2366 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2369 dev0
= ata_devchk(ap
, 0);
2371 dev1
= ata_devchk(ap
, 1);
2375 devmask
|= (1 << 0);
2377 devmask
|= (1 << 1);
2379 /* select device 0 again */
2380 ap
->ops
->dev_select(ap
, 0);
2382 /* issue bus reset */
2383 if (ap
->flags
& ATA_FLAG_SRST
)
2384 if (ata_bus_softreset(ap
, devmask
))
2388 * determine by signature whether we have ATA or ATAPI devices
2390 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2391 if ((slave_possible
) && (err
!= 0x81))
2392 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2394 /* re-enable interrupts */
2395 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2398 /* is double-select really necessary? */
2399 if (ap
->device
[1].class != ATA_DEV_NONE
)
2400 ap
->ops
->dev_select(ap
, 1);
2401 if (ap
->device
[0].class != ATA_DEV_NONE
)
2402 ap
->ops
->dev_select(ap
, 0);
2404 /* if no devices were detected, disable this port */
2405 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2406 (ap
->device
[1].class == ATA_DEV_NONE
))
2409 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2410 /* set up device control for ATA_FLAG_SATA_RESET */
2411 if (ap
->flags
& ATA_FLAG_MMIO
)
2412 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2414 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2421 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2422 ap
->ops
->port_disable(ap
);
2428 * sata_phy_debounce - debounce SATA phy status
2429 * @ap: ATA port to debounce SATA phy status for
2430 * @params: timing parameters { interval, duratinon, timeout } in msec
2432 * Make sure SStatus of @ap reaches stable state, determined by
2433 * holding the same value where DET is not 1 for @duration polled
2434 * every @interval, before @timeout. Timeout constraints the
2435 * beginning of the stable state. Because, after hot unplugging,
2436 * DET gets stuck at 1 on some controllers, this functions waits
2437 * until timeout then returns 0 if DET is stable at 1.
2440 * Kernel thread context (may sleep)
2443 * 0 on success, -errno on failure.
2445 int sata_phy_debounce(struct ata_port
*ap
, const unsigned long *params
)
2447 unsigned long interval_msec
= params
[0];
2448 unsigned long duration
= params
[1] * HZ
/ 1000;
2449 unsigned long timeout
= jiffies
+ params
[2] * HZ
/ 1000;
2450 unsigned long last_jiffies
;
2454 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2459 last_jiffies
= jiffies
;
2462 msleep(interval_msec
);
2463 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2469 if (cur
== 1 && time_before(jiffies
, timeout
))
2471 if (time_after(jiffies
, last_jiffies
+ duration
))
2476 /* unstable, start over */
2478 last_jiffies
= jiffies
;
2481 if (time_after(jiffies
, timeout
))
2487 * sata_phy_resume - resume SATA phy
2488 * @ap: ATA port to resume SATA phy for
2489 * @params: timing parameters { interval, duratinon, timeout } in msec
2491 * Resume SATA phy of @ap and debounce it.
2494 * Kernel thread context (may sleep)
2497 * 0 on success, -errno on failure.
2499 int sata_phy_resume(struct ata_port
*ap
, const unsigned long *params
)
2504 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2507 scontrol
= (scontrol
& 0x0f0) | 0x300;
2509 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2512 /* Some PHYs react badly if SStatus is pounded immediately
2513 * after resuming. Delay 200ms before debouncing.
2517 return sata_phy_debounce(ap
, params
);
2520 static void ata_wait_spinup(struct ata_port
*ap
)
2522 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2523 unsigned long end
, secs
;
2526 /* first, debounce phy if SATA */
2527 if (ap
->cbl
== ATA_CBL_SATA
) {
2528 rc
= sata_phy_debounce(ap
, sata_deb_timing_eh
);
2530 /* if debounced successfully and offline, no need to wait */
2531 if ((rc
== 0 || rc
== -EOPNOTSUPP
) && ata_port_offline(ap
))
2535 /* okay, let's give the drive time to spin up */
2536 end
= ehc
->i
.hotplug_timestamp
+ ATA_SPINUP_WAIT
* HZ
/ 1000;
2537 secs
= ((end
- jiffies
) + HZ
- 1) / HZ
;
2539 if (time_after(jiffies
, end
))
2543 ata_port_printk(ap
, KERN_INFO
, "waiting for device to spin up "
2544 "(%lu secs)\n", secs
);
2546 schedule_timeout_uninterruptible(end
- jiffies
);
2550 * ata_std_prereset - prepare for reset
2551 * @ap: ATA port to be reset
2553 * @ap is about to be reset. Initialize it.
2556 * Kernel thread context (may sleep)
2559 * 0 on success, -errno otherwise.
2561 int ata_std_prereset(struct ata_port
*ap
)
2563 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2564 const unsigned long *timing
;
2568 if (ehc
->i
.flags
& ATA_EHI_HOTPLUGGED
) {
2569 if (ap
->flags
& ATA_FLAG_HRST_TO_RESUME
)
2570 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2571 if (ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
)
2572 ata_wait_spinup(ap
);
2575 /* if we're about to do hardreset, nothing more to do */
2576 if (ehc
->i
.action
& ATA_EH_HARDRESET
)
2579 /* if SATA, resume phy */
2580 if (ap
->cbl
== ATA_CBL_SATA
) {
2581 if (ap
->flags
& ATA_FLAG_LOADING
)
2582 timing
= sata_deb_timing_boot
;
2584 timing
= sata_deb_timing_eh
;
2586 rc
= sata_phy_resume(ap
, timing
);
2587 if (rc
&& rc
!= -EOPNOTSUPP
) {
2588 /* phy resume failed */
2589 ata_port_printk(ap
, KERN_WARNING
, "failed to resume "
2590 "link for reset (errno=%d)\n", rc
);
2595 /* Wait for !BSY if the controller can wait for the first D2H
2596 * Reg FIS and we don't know that no device is attached.
2598 if (!(ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
) && !ata_port_offline(ap
))
2599 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2605 * ata_std_softreset - reset host port via ATA SRST
2606 * @ap: port to reset
2607 * @classes: resulting classes of attached devices
2609 * Reset host port using ATA SRST.
2612 * Kernel thread context (may sleep)
2615 * 0 on success, -errno otherwise.
2617 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2619 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2620 unsigned int devmask
= 0, err_mask
;
2625 if (ata_port_offline(ap
)) {
2626 classes
[0] = ATA_DEV_NONE
;
2630 /* determine if device 0/1 are present */
2631 if (ata_devchk(ap
, 0))
2632 devmask
|= (1 << 0);
2633 if (slave_possible
&& ata_devchk(ap
, 1))
2634 devmask
|= (1 << 1);
2636 /* select device 0 again */
2637 ap
->ops
->dev_select(ap
, 0);
2639 /* issue bus reset */
2640 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2641 err_mask
= ata_bus_softreset(ap
, devmask
);
2643 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2648 /* determine by signature whether we have ATA or ATAPI devices */
2649 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2650 if (slave_possible
&& err
!= 0x81)
2651 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2654 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2659 * sata_std_hardreset - reset host port via SATA phy reset
2660 * @ap: port to reset
2661 * @class: resulting class of attached device
2663 * SATA phy-reset host port using DET bits of SControl register.
2666 * Kernel thread context (may sleep)
2669 * 0 on success, -errno otherwise.
2671 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2678 if (sata_set_spd_needed(ap
)) {
2679 /* SATA spec says nothing about how to reconfigure
2680 * spd. To be on the safe side, turn off phy during
2681 * reconfiguration. This works for at least ICH7 AHCI
2684 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2687 scontrol
= (scontrol
& 0x0f0) | 0x302;
2689 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2695 /* issue phy wake/reset */
2696 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2699 scontrol
= (scontrol
& 0x0f0) | 0x301;
2701 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2704 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2705 * 10.4.2 says at least 1 ms.
2709 /* bring phy back */
2710 sata_phy_resume(ap
, sata_deb_timing_eh
);
2712 /* TODO: phy layer with polling, timeouts, etc. */
2713 if (ata_port_offline(ap
)) {
2714 *class = ATA_DEV_NONE
;
2715 DPRINTK("EXIT, link offline\n");
2719 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2720 ata_port_printk(ap
, KERN_ERR
,
2721 "COMRESET failed (device not ready)\n");
2725 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2727 *class = ata_dev_try_classify(ap
, 0, NULL
);
2729 DPRINTK("EXIT, class=%u\n", *class);
2734 * ata_std_postreset - standard postreset callback
2735 * @ap: the target ata_port
2736 * @classes: classes of attached devices
2738 * This function is invoked after a successful reset. Note that
2739 * the device might have been reset more than once using
2740 * different reset methods before postreset is invoked.
2743 * Kernel thread context (may sleep)
2745 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2751 /* print link status */
2752 sata_print_link_status(ap
);
2755 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2756 sata_scr_write(ap
, SCR_ERROR
, serror
);
2758 /* re-enable interrupts */
2759 if (!ap
->ops
->error_handler
) {
2760 /* FIXME: hack. create a hook instead */
2761 if (ap
->ioaddr
.ctl_addr
)
2765 /* is double-select really necessary? */
2766 if (classes
[0] != ATA_DEV_NONE
)
2767 ap
->ops
->dev_select(ap
, 1);
2768 if (classes
[1] != ATA_DEV_NONE
)
2769 ap
->ops
->dev_select(ap
, 0);
2771 /* bail out if no device is present */
2772 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2773 DPRINTK("EXIT, no device\n");
2777 /* set up device control */
2778 if (ap
->ioaddr
.ctl_addr
) {
2779 if (ap
->flags
& ATA_FLAG_MMIO
)
2780 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2782 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2789 * ata_dev_same_device - Determine whether new ID matches configured device
2790 * @dev: device to compare against
2791 * @new_class: class of the new device
2792 * @new_id: IDENTIFY page of the new device
2794 * Compare @new_class and @new_id against @dev and determine
2795 * whether @dev is the device indicated by @new_class and
2802 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2804 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2807 const u16
*old_id
= dev
->id
;
2808 unsigned char model
[2][41], serial
[2][21];
2811 if (dev
->class != new_class
) {
2812 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2813 dev
->class, new_class
);
2817 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2818 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2819 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2820 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2821 new_n_sectors
= ata_id_n_sectors(new_id
);
2823 if (strcmp(model
[0], model
[1])) {
2824 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2825 "'%s' != '%s'\n", model
[0], model
[1]);
2829 if (strcmp(serial
[0], serial
[1])) {
2830 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2831 "'%s' != '%s'\n", serial
[0], serial
[1]);
2835 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2836 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2838 (unsigned long long)dev
->n_sectors
,
2839 (unsigned long long)new_n_sectors
);
2847 * ata_dev_revalidate - Revalidate ATA device
2848 * @dev: device to revalidate
2849 * @post_reset: is this revalidation after reset?
2851 * Re-read IDENTIFY page and make sure @dev is still attached to
2855 * Kernel thread context (may sleep)
2858 * 0 on success, negative errno otherwise
2860 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2862 unsigned int class = dev
->class;
2863 u16
*id
= (void *)dev
->ap
->sector_buf
;
2866 if (!ata_dev_enabled(dev
)) {
2872 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2876 /* is the device still there? */
2877 if (!ata_dev_same_device(dev
, class, id
)) {
2882 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2884 /* configure device according to the new ID */
2885 rc
= ata_dev_configure(dev
, 0);
2890 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
2894 static const char * const ata_dma_blacklist
[] = {
2895 "WDC AC11000H", NULL
,
2896 "WDC AC22100H", NULL
,
2897 "WDC AC32500H", NULL
,
2898 "WDC AC33100H", NULL
,
2899 "WDC AC31600H", NULL
,
2900 "WDC AC32100H", "24.09P07",
2901 "WDC AC23200L", "21.10N21",
2902 "Compaq CRD-8241B", NULL
,
2907 "SanDisk SDP3B", NULL
,
2908 "SanDisk SDP3B-64", NULL
,
2909 "SANYO CD-ROM CRD", NULL
,
2910 "HITACHI CDR-8", NULL
,
2911 "HITACHI CDR-8335", NULL
,
2912 "HITACHI CDR-8435", NULL
,
2913 "Toshiba CD-ROM XM-6202B", NULL
,
2914 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2916 "E-IDE CD-ROM CR-840", NULL
,
2917 "CD-ROM Drive/F5A", NULL
,
2918 "WPI CDD-820", NULL
,
2919 "SAMSUNG CD-ROM SC-148C", NULL
,
2920 "SAMSUNG CD-ROM SC", NULL
,
2921 "SanDisk SDP3B-64", NULL
,
2922 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2923 "_NEC DV5800A", NULL
,
2924 "SAMSUNG CD-ROM SN-124", "N001"
2927 static int ata_strim(char *s
, size_t len
)
2929 len
= strnlen(s
, len
);
2931 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2932 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2939 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2941 unsigned char model_num
[40];
2942 unsigned char model_rev
[16];
2943 unsigned int nlen
, rlen
;
2946 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2948 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2950 nlen
= ata_strim(model_num
, sizeof(model_num
));
2951 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2953 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2954 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2955 if (ata_dma_blacklist
[i
+1] == NULL
)
2957 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2965 * ata_dev_xfermask - Compute supported xfermask of the given device
2966 * @dev: Device to compute xfermask for
2968 * Compute supported xfermask of @dev and store it in
2969 * dev->*_mask. This function is responsible for applying all
2970 * known limits including host controller limits, device
2973 * FIXME: The current implementation limits all transfer modes to
2974 * the fastest of the lowested device on the port. This is not
2975 * required on most controllers.
2980 static void ata_dev_xfermask(struct ata_device
*dev
)
2982 struct ata_port
*ap
= dev
->ap
;
2983 struct ata_host_set
*hs
= ap
->host_set
;
2984 unsigned long xfer_mask
;
2987 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
2988 ap
->mwdma_mask
, ap
->udma_mask
);
2990 /* Apply cable rule here. Don't apply it early because when
2991 * we handle hot plug the cable type can itself change.
2993 if (ap
->cbl
== ATA_CBL_PATA40
)
2994 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2996 /* FIXME: Use port-wide xfermask for now */
2997 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2998 struct ata_device
*d
= &ap
->device
[i
];
3000 if (ata_dev_absent(d
))
3003 if (ata_dev_disabled(d
)) {
3004 /* to avoid violating device selection timing */
3005 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3006 UINT_MAX
, UINT_MAX
);
3010 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3011 d
->mwdma_mask
, d
->udma_mask
);
3012 xfer_mask
&= ata_id_xfermask(d
->id
);
3013 if (ata_dma_blacklisted(d
))
3014 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3017 if (ata_dma_blacklisted(dev
))
3018 ata_dev_printk(dev
, KERN_WARNING
,
3019 "device is on DMA blacklist, disabling DMA\n");
3021 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
3022 if (hs
->simplex_claimed
)
3023 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3026 if (ap
->ops
->mode_filter
)
3027 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
3029 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
3030 &dev
->mwdma_mask
, &dev
->udma_mask
);
3034 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3035 * @dev: Device to which command will be sent
3037 * Issue SET FEATURES - XFER MODE command to device @dev
3041 * PCI/etc. bus probe sem.
3044 * 0 on success, AC_ERR_* mask otherwise.
3047 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3049 struct ata_taskfile tf
;
3050 unsigned int err_mask
;
3052 /* set up set-features taskfile */
3053 DPRINTK("set features - xfer mode\n");
3055 ata_tf_init(dev
, &tf
);
3056 tf
.command
= ATA_CMD_SET_FEATURES
;
3057 tf
.feature
= SETFEATURES_XFER
;
3058 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3059 tf
.protocol
= ATA_PROT_NODATA
;
3060 tf
.nsect
= dev
->xfer_mode
;
3062 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3064 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3069 * ata_dev_init_params - Issue INIT DEV PARAMS command
3070 * @dev: Device to which command will be sent
3071 * @heads: Number of heads (taskfile parameter)
3072 * @sectors: Number of sectors (taskfile parameter)
3075 * Kernel thread context (may sleep)
3078 * 0 on success, AC_ERR_* mask otherwise.
3080 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3081 u16 heads
, u16 sectors
)
3083 struct ata_taskfile tf
;
3084 unsigned int err_mask
;
3086 /* Number of sectors per track 1-255. Number of heads 1-16 */
3087 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3088 return AC_ERR_INVALID
;
3090 /* set up init dev params taskfile */
3091 DPRINTK("init dev params \n");
3093 ata_tf_init(dev
, &tf
);
3094 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3095 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3096 tf
.protocol
= ATA_PROT_NODATA
;
3098 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3100 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3102 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3107 * ata_sg_clean - Unmap DMA memory associated with command
3108 * @qc: Command containing DMA memory to be released
3110 * Unmap all mapped DMA memory associated with this command.
3113 * spin_lock_irqsave(host_set lock)
3116 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3118 struct ata_port
*ap
= qc
->ap
;
3119 struct scatterlist
*sg
= qc
->__sg
;
3120 int dir
= qc
->dma_dir
;
3121 void *pad_buf
= NULL
;
3123 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3124 WARN_ON(sg
== NULL
);
3126 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3127 WARN_ON(qc
->n_elem
> 1);
3129 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3131 /* if we padded the buffer out to 32-bit bound, and data
3132 * xfer direction is from-device, we must copy from the
3133 * pad buffer back into the supplied buffer
3135 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3136 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3138 if (qc
->flags
& ATA_QCFLAG_SG
) {
3140 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3141 /* restore last sg */
3142 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3144 struct scatterlist
*psg
= &qc
->pad_sgent
;
3145 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3146 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3147 kunmap_atomic(addr
, KM_IRQ0
);
3151 dma_unmap_single(ap
->dev
,
3152 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3155 sg
->length
+= qc
->pad_len
;
3157 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3158 pad_buf
, qc
->pad_len
);
3161 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3166 * ata_fill_sg - Fill PCI IDE PRD table
3167 * @qc: Metadata associated with taskfile to be transferred
3169 * Fill PCI IDE PRD (scatter-gather) table with segments
3170 * associated with the current disk command.
3173 * spin_lock_irqsave(host_set lock)
3176 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3178 struct ata_port
*ap
= qc
->ap
;
3179 struct scatterlist
*sg
;
3182 WARN_ON(qc
->__sg
== NULL
);
3183 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3186 ata_for_each_sg(sg
, qc
) {
3190 /* determine if physical DMA addr spans 64K boundary.
3191 * Note h/w doesn't support 64-bit, so we unconditionally
3192 * truncate dma_addr_t to u32.
3194 addr
= (u32
) sg_dma_address(sg
);
3195 sg_len
= sg_dma_len(sg
);
3198 offset
= addr
& 0xffff;
3200 if ((offset
+ sg_len
) > 0x10000)
3201 len
= 0x10000 - offset
;
3203 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3204 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3205 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3214 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3217 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3218 * @qc: Metadata associated with taskfile to check
3220 * Allow low-level driver to filter ATA PACKET commands, returning
3221 * a status indicating whether or not it is OK to use DMA for the
3222 * supplied PACKET command.
3225 * spin_lock_irqsave(host_set lock)
3227 * RETURNS: 0 when ATAPI DMA can be used
3230 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3232 struct ata_port
*ap
= qc
->ap
;
3233 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3235 if (ap
->ops
->check_atapi_dma
)
3236 rc
= ap
->ops
->check_atapi_dma(qc
);
3238 /* We don't support polling DMA.
3239 * Use PIO if the LLDD handles only interrupts in
3240 * the HSM_ST_LAST state and the ATAPI device
3241 * generates CDB interrupts.
3243 if ((ap
->flags
& ATA_FLAG_PIO_POLLING
) &&
3244 (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3250 * ata_qc_prep - Prepare taskfile for submission
3251 * @qc: Metadata associated with taskfile to be prepared
3253 * Prepare ATA taskfile for submission.
3256 * spin_lock_irqsave(host_set lock)
3258 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3260 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3266 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3269 * ata_sg_init_one - Associate command with memory buffer
3270 * @qc: Command to be associated
3271 * @buf: Memory buffer
3272 * @buflen: Length of memory buffer, in bytes.
3274 * Initialize the data-related elements of queued_cmd @qc
3275 * to point to a single memory buffer, @buf of byte length @buflen.
3278 * spin_lock_irqsave(host_set lock)
3281 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3283 struct scatterlist
*sg
;
3285 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3287 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3288 qc
->__sg
= &qc
->sgent
;
3290 qc
->orig_n_elem
= 1;
3292 qc
->nbytes
= buflen
;
3295 sg_init_one(sg
, buf
, buflen
);
3299 * ata_sg_init - Associate command with scatter-gather table.
3300 * @qc: Command to be associated
3301 * @sg: Scatter-gather table.
3302 * @n_elem: Number of elements in s/g table.
3304 * Initialize the data-related elements of queued_cmd @qc
3305 * to point to a scatter-gather table @sg, containing @n_elem
3309 * spin_lock_irqsave(host_set lock)
3312 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3313 unsigned int n_elem
)
3315 qc
->flags
|= ATA_QCFLAG_SG
;
3317 qc
->n_elem
= n_elem
;
3318 qc
->orig_n_elem
= n_elem
;
3322 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3323 * @qc: Command with memory buffer to be mapped.
3325 * DMA-map the memory buffer associated with queued_cmd @qc.
3328 * spin_lock_irqsave(host_set lock)
3331 * Zero on success, negative on error.
3334 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3336 struct ata_port
*ap
= qc
->ap
;
3337 int dir
= qc
->dma_dir
;
3338 struct scatterlist
*sg
= qc
->__sg
;
3339 dma_addr_t dma_address
;
3342 /* we must lengthen transfers to end on a 32-bit boundary */
3343 qc
->pad_len
= sg
->length
& 3;
3345 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3346 struct scatterlist
*psg
= &qc
->pad_sgent
;
3348 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3350 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3352 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3353 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3356 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3357 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3359 sg
->length
-= qc
->pad_len
;
3360 if (sg
->length
== 0)
3363 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3364 sg
->length
, qc
->pad_len
);
3372 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3374 if (dma_mapping_error(dma_address
)) {
3376 sg
->length
+= qc
->pad_len
;
3380 sg_dma_address(sg
) = dma_address
;
3381 sg_dma_len(sg
) = sg
->length
;
3384 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3385 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3391 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3392 * @qc: Command with scatter-gather table to be mapped.
3394 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3397 * spin_lock_irqsave(host_set lock)
3400 * Zero on success, negative on error.
3404 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3406 struct ata_port
*ap
= qc
->ap
;
3407 struct scatterlist
*sg
= qc
->__sg
;
3408 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3409 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3411 VPRINTK("ENTER, ata%u\n", ap
->id
);
3412 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3414 /* we must lengthen transfers to end on a 32-bit boundary */
3415 qc
->pad_len
= lsg
->length
& 3;
3417 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3418 struct scatterlist
*psg
= &qc
->pad_sgent
;
3419 unsigned int offset
;
3421 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3423 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3426 * psg->page/offset are used to copy to-be-written
3427 * data in this function or read data in ata_sg_clean.
3429 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3430 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3431 psg
->offset
= offset_in_page(offset
);
3433 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3434 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3435 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3436 kunmap_atomic(addr
, KM_IRQ0
);
3439 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3440 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3442 lsg
->length
-= qc
->pad_len
;
3443 if (lsg
->length
== 0)
3446 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3447 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3450 pre_n_elem
= qc
->n_elem
;
3451 if (trim_sg
&& pre_n_elem
)
3460 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3462 /* restore last sg */
3463 lsg
->length
+= qc
->pad_len
;
3467 DPRINTK("%d sg elements mapped\n", n_elem
);
3470 qc
->n_elem
= n_elem
;
3476 * swap_buf_le16 - swap halves of 16-bit words in place
3477 * @buf: Buffer to swap
3478 * @buf_words: Number of 16-bit words in buffer.
3480 * Swap halves of 16-bit words if needed to convert from
3481 * little-endian byte order to native cpu byte order, or
3485 * Inherited from caller.
3487 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3492 for (i
= 0; i
< buf_words
; i
++)
3493 buf
[i
] = le16_to_cpu(buf
[i
]);
3494 #endif /* __BIG_ENDIAN */
3498 * ata_mmio_data_xfer - Transfer data by MMIO
3499 * @dev: device for this I/O
3501 * @buflen: buffer length
3502 * @write_data: read/write
3504 * Transfer data from/to the device data register by MMIO.
3507 * Inherited from caller.
3510 void ata_mmio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3511 unsigned int buflen
, int write_data
)
3513 struct ata_port
*ap
= adev
->ap
;
3515 unsigned int words
= buflen
>> 1;
3516 u16
*buf16
= (u16
*) buf
;
3517 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3519 /* Transfer multiple of 2 bytes */
3521 for (i
= 0; i
< words
; i
++)
3522 writew(le16_to_cpu(buf16
[i
]), mmio
);
3524 for (i
= 0; i
< words
; i
++)
3525 buf16
[i
] = cpu_to_le16(readw(mmio
));
3528 /* Transfer trailing 1 byte, if any. */
3529 if (unlikely(buflen
& 0x01)) {
3530 u16 align_buf
[1] = { 0 };
3531 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3534 memcpy(align_buf
, trailing_buf
, 1);
3535 writew(le16_to_cpu(align_buf
[0]), mmio
);
3537 align_buf
[0] = cpu_to_le16(readw(mmio
));
3538 memcpy(trailing_buf
, align_buf
, 1);
3544 * ata_pio_data_xfer - Transfer data by PIO
3545 * @adev: device to target
3547 * @buflen: buffer length
3548 * @write_data: read/write
3550 * Transfer data from/to the device data register by PIO.
3553 * Inherited from caller.
3556 void ata_pio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3557 unsigned int buflen
, int write_data
)
3559 struct ata_port
*ap
= adev
->ap
;
3560 unsigned int words
= buflen
>> 1;
3562 /* Transfer multiple of 2 bytes */
3564 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3566 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3568 /* Transfer trailing 1 byte, if any. */
3569 if (unlikely(buflen
& 0x01)) {
3570 u16 align_buf
[1] = { 0 };
3571 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3574 memcpy(align_buf
, trailing_buf
, 1);
3575 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3577 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3578 memcpy(trailing_buf
, align_buf
, 1);
3584 * ata_pio_data_xfer_noirq - Transfer data by PIO
3585 * @adev: device to target
3587 * @buflen: buffer length
3588 * @write_data: read/write
3590 * Transfer data from/to the device data register by PIO. Do the
3591 * transfer with interrupts disabled.
3594 * Inherited from caller.
3597 void ata_pio_data_xfer_noirq(struct ata_device
*adev
, unsigned char *buf
,
3598 unsigned int buflen
, int write_data
)
3600 unsigned long flags
;
3601 local_irq_save(flags
);
3602 ata_pio_data_xfer(adev
, buf
, buflen
, write_data
);
3603 local_irq_restore(flags
);
3608 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3609 * @qc: Command on going
3611 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3614 * Inherited from caller.
3617 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3619 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3620 struct scatterlist
*sg
= qc
->__sg
;
3621 struct ata_port
*ap
= qc
->ap
;
3623 unsigned int offset
;
3626 if (qc
->cursect
== (qc
->nsect
- 1))
3627 ap
->hsm_task_state
= HSM_ST_LAST
;
3629 page
= sg
[qc
->cursg
].page
;
3630 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3632 /* get the current page and offset */
3633 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3634 offset
%= PAGE_SIZE
;
3636 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3638 if (PageHighMem(page
)) {
3639 unsigned long flags
;
3641 /* FIXME: use a bounce buffer */
3642 local_irq_save(flags
);
3643 buf
= kmap_atomic(page
, KM_IRQ0
);
3645 /* do the actual data transfer */
3646 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3648 kunmap_atomic(buf
, KM_IRQ0
);
3649 local_irq_restore(flags
);
3651 buf
= page_address(page
);
3652 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3658 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3665 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3666 * @qc: Command on going
3668 * Transfer one or many ATA_SECT_SIZE of data from/to the
3669 * ATA device for the DRQ request.
3672 * Inherited from caller.
3675 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3677 if (is_multi_taskfile(&qc
->tf
)) {
3678 /* READ/WRITE MULTIPLE */
3681 WARN_ON(qc
->dev
->multi_count
== 0);
3683 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3691 * atapi_send_cdb - Write CDB bytes to hardware
3692 * @ap: Port to which ATAPI device is attached.
3693 * @qc: Taskfile currently active
3695 * When device has indicated its readiness to accept
3696 * a CDB, this function is called. Send the CDB.
3702 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3705 DPRINTK("send cdb\n");
3706 WARN_ON(qc
->dev
->cdb_len
< 12);
3708 ap
->ops
->data_xfer(qc
->dev
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3709 ata_altstatus(ap
); /* flush */
3711 switch (qc
->tf
.protocol
) {
3712 case ATA_PROT_ATAPI
:
3713 ap
->hsm_task_state
= HSM_ST
;
3715 case ATA_PROT_ATAPI_NODATA
:
3716 ap
->hsm_task_state
= HSM_ST_LAST
;
3718 case ATA_PROT_ATAPI_DMA
:
3719 ap
->hsm_task_state
= HSM_ST_LAST
;
3720 /* initiate bmdma */
3721 ap
->ops
->bmdma_start(qc
);
3727 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3728 * @qc: Command on going
3729 * @bytes: number of bytes
3731 * Transfer Transfer data from/to the ATAPI device.
3734 * Inherited from caller.
3738 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3740 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3741 struct scatterlist
*sg
= qc
->__sg
;
3742 struct ata_port
*ap
= qc
->ap
;
3745 unsigned int offset
, count
;
3747 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3748 ap
->hsm_task_state
= HSM_ST_LAST
;
3751 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3753 * The end of qc->sg is reached and the device expects
3754 * more data to transfer. In order not to overrun qc->sg
3755 * and fulfill length specified in the byte count register,
3756 * - for read case, discard trailing data from the device
3757 * - for write case, padding zero data to the device
3759 u16 pad_buf
[1] = { 0 };
3760 unsigned int words
= bytes
>> 1;
3763 if (words
) /* warning if bytes > 1 */
3764 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3765 "%u bytes trailing data\n", bytes
);
3767 for (i
= 0; i
< words
; i
++)
3768 ap
->ops
->data_xfer(qc
->dev
, (unsigned char*)pad_buf
, 2, do_write
);
3770 ap
->hsm_task_state
= HSM_ST_LAST
;
3774 sg
= &qc
->__sg
[qc
->cursg
];
3777 offset
= sg
->offset
+ qc
->cursg_ofs
;
3779 /* get the current page and offset */
3780 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3781 offset
%= PAGE_SIZE
;
3783 /* don't overrun current sg */
3784 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3786 /* don't cross page boundaries */
3787 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3789 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3791 if (PageHighMem(page
)) {
3792 unsigned long flags
;
3794 /* FIXME: use bounce buffer */
3795 local_irq_save(flags
);
3796 buf
= kmap_atomic(page
, KM_IRQ0
);
3798 /* do the actual data transfer */
3799 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3801 kunmap_atomic(buf
, KM_IRQ0
);
3802 local_irq_restore(flags
);
3804 buf
= page_address(page
);
3805 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3809 qc
->curbytes
+= count
;
3810 qc
->cursg_ofs
+= count
;
3812 if (qc
->cursg_ofs
== sg
->length
) {
3822 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3823 * @qc: Command on going
3825 * Transfer Transfer data from/to the ATAPI device.
3828 * Inherited from caller.
3831 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3833 struct ata_port
*ap
= qc
->ap
;
3834 struct ata_device
*dev
= qc
->dev
;
3835 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3836 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3838 /* Abuse qc->result_tf for temp storage of intermediate TF
3839 * here to save some kernel stack usage.
3840 * For normal completion, qc->result_tf is not relevant. For
3841 * error, qc->result_tf is later overwritten by ata_qc_complete().
3842 * So, the correctness of qc->result_tf is not affected.
3844 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
3845 ireason
= qc
->result_tf
.nsect
;
3846 bc_lo
= qc
->result_tf
.lbam
;
3847 bc_hi
= qc
->result_tf
.lbah
;
3848 bytes
= (bc_hi
<< 8) | bc_lo
;
3850 /* shall be cleared to zero, indicating xfer of data */
3851 if (ireason
& (1 << 0))
3854 /* make sure transfer direction matches expected */
3855 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3856 if (do_write
!= i_write
)
3859 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3861 __atapi_pio_bytes(qc
, bytes
);
3866 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
3867 qc
->err_mask
|= AC_ERR_HSM
;
3868 ap
->hsm_task_state
= HSM_ST_ERR
;
3872 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3873 * @ap: the target ata_port
3877 * 1 if ok in workqueue, 0 otherwise.
3880 static inline int ata_hsm_ok_in_wq(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3882 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3885 if (ap
->hsm_task_state
== HSM_ST_FIRST
) {
3886 if (qc
->tf
.protocol
== ATA_PROT_PIO
&&
3887 (qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3890 if (is_atapi_taskfile(&qc
->tf
) &&
3891 !(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3899 * ata_hsm_qc_complete - finish a qc running on standard HSM
3900 * @qc: Command to complete
3901 * @in_wq: 1 if called from workqueue, 0 otherwise
3903 * Finish @qc which is running on standard HSM.
3906 * If @in_wq is zero, spin_lock_irqsave(host_set lock).
3907 * Otherwise, none on entry and grabs host lock.
3909 static void ata_hsm_qc_complete(struct ata_queued_cmd
*qc
, int in_wq
)
3911 struct ata_port
*ap
= qc
->ap
;
3912 unsigned long flags
;
3914 if (ap
->ops
->error_handler
) {
3916 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3918 /* EH might have kicked in while host_set lock
3921 qc
= ata_qc_from_tag(ap
, qc
->tag
);
3923 if (likely(!(qc
->err_mask
& AC_ERR_HSM
))) {
3925 ata_qc_complete(qc
);
3927 ata_port_freeze(ap
);
3930 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3932 if (likely(!(qc
->err_mask
& AC_ERR_HSM
)))
3933 ata_qc_complete(qc
);
3935 ata_port_freeze(ap
);
3939 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3941 ata_qc_complete(qc
);
3942 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3944 ata_qc_complete(qc
);
3947 ata_altstatus(ap
); /* flush */
3951 * ata_hsm_move - move the HSM to the next state.
3952 * @ap: the target ata_port
3954 * @status: current device status
3955 * @in_wq: 1 if called from workqueue, 0 otherwise
3958 * 1 when poll next status needed, 0 otherwise.
3960 int ata_hsm_move(struct ata_port
*ap
, struct ata_queued_cmd
*qc
,
3961 u8 status
, int in_wq
)
3963 unsigned long flags
= 0;
3966 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
3968 /* Make sure ata_qc_issue_prot() does not throw things
3969 * like DMA polling into the workqueue. Notice that
3970 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
3972 WARN_ON(in_wq
!= ata_hsm_ok_in_wq(ap
, qc
));
3975 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
3976 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
3978 switch (ap
->hsm_task_state
) {
3980 /* Send first data block or PACKET CDB */
3982 /* If polling, we will stay in the work queue after
3983 * sending the data. Otherwise, interrupt handler
3984 * takes over after sending the data.
3986 poll_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
3988 /* check device status */
3989 if (unlikely((status
& ATA_DRQ
) == 0)) {
3990 /* handle BSY=0, DRQ=0 as error */
3991 if (likely(status
& (ATA_ERR
| ATA_DF
)))
3992 /* device stops HSM for abort/error */
3993 qc
->err_mask
|= AC_ERR_DEV
;
3995 /* HSM violation. Let EH handle this */
3996 qc
->err_mask
|= AC_ERR_HSM
;
3998 ap
->hsm_task_state
= HSM_ST_ERR
;
4002 /* Device should not ask for data transfer (DRQ=1)
4003 * when it finds something wrong.
4004 * We ignore DRQ here and stop the HSM by
4005 * changing hsm_task_state to HSM_ST_ERR and
4006 * let the EH abort the command or reset the device.
4008 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4009 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4011 qc
->err_mask
|= AC_ERR_HSM
;
4012 ap
->hsm_task_state
= HSM_ST_ERR
;
4016 /* Send the CDB (atapi) or the first data block (ata pio out).
4017 * During the state transition, interrupt handler shouldn't
4018 * be invoked before the data transfer is complete and
4019 * hsm_task_state is changed. Hence, the following locking.
4022 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4024 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
4025 /* PIO data out protocol.
4026 * send first data block.
4029 /* ata_pio_sectors() might change the state
4030 * to HSM_ST_LAST. so, the state is changed here
4031 * before ata_pio_sectors().
4033 ap
->hsm_task_state
= HSM_ST
;
4034 ata_pio_sectors(qc
);
4035 ata_altstatus(ap
); /* flush */
4038 atapi_send_cdb(ap
, qc
);
4041 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4043 /* if polling, ata_pio_task() handles the rest.
4044 * otherwise, interrupt handler takes over from here.
4049 /* complete command or read/write the data register */
4050 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4051 /* ATAPI PIO protocol */
4052 if ((status
& ATA_DRQ
) == 0) {
4053 /* No more data to transfer or device error.
4054 * Device error will be tagged in HSM_ST_LAST.
4056 ap
->hsm_task_state
= HSM_ST_LAST
;
4060 /* Device should not ask for data transfer (DRQ=1)
4061 * when it finds something wrong.
4062 * We ignore DRQ here and stop the HSM by
4063 * changing hsm_task_state to HSM_ST_ERR and
4064 * let the EH abort the command or reset the device.
4066 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4067 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4069 qc
->err_mask
|= AC_ERR_HSM
;
4070 ap
->hsm_task_state
= HSM_ST_ERR
;
4074 atapi_pio_bytes(qc
);
4076 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4077 /* bad ireason reported by device */
4081 /* ATA PIO protocol */
4082 if (unlikely((status
& ATA_DRQ
) == 0)) {
4083 /* handle BSY=0, DRQ=0 as error */
4084 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4085 /* device stops HSM for abort/error */
4086 qc
->err_mask
|= AC_ERR_DEV
;
4088 /* HSM violation. Let EH handle this */
4089 qc
->err_mask
|= AC_ERR_HSM
;
4091 ap
->hsm_task_state
= HSM_ST_ERR
;
4095 /* For PIO reads, some devices may ask for
4096 * data transfer (DRQ=1) alone with ERR=1.
4097 * We respect DRQ here and transfer one
4098 * block of junk data before changing the
4099 * hsm_task_state to HSM_ST_ERR.
4101 * For PIO writes, ERR=1 DRQ=1 doesn't make
4102 * sense since the data block has been
4103 * transferred to the device.
4105 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4106 /* data might be corrputed */
4107 qc
->err_mask
|= AC_ERR_DEV
;
4109 if (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
)) {
4110 ata_pio_sectors(qc
);
4112 status
= ata_wait_idle(ap
);
4115 if (status
& (ATA_BUSY
| ATA_DRQ
))
4116 qc
->err_mask
|= AC_ERR_HSM
;
4118 /* ata_pio_sectors() might change the
4119 * state to HSM_ST_LAST. so, the state
4120 * is changed after ata_pio_sectors().
4122 ap
->hsm_task_state
= HSM_ST_ERR
;
4126 ata_pio_sectors(qc
);
4128 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4129 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4132 status
= ata_wait_idle(ap
);
4137 ata_altstatus(ap
); /* flush */
4142 if (unlikely(!ata_ok(status
))) {
4143 qc
->err_mask
|= __ac_err_mask(status
);
4144 ap
->hsm_task_state
= HSM_ST_ERR
;
4148 /* no more data to transfer */
4149 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4150 ap
->id
, qc
->dev
->devno
, status
);
4152 WARN_ON(qc
->err_mask
);
4154 ap
->hsm_task_state
= HSM_ST_IDLE
;
4156 /* complete taskfile transaction */
4157 ata_hsm_qc_complete(qc
, in_wq
);
4163 /* make sure qc->err_mask is available to
4164 * know what's wrong and recover
4166 WARN_ON(qc
->err_mask
== 0);
4168 ap
->hsm_task_state
= HSM_ST_IDLE
;
4170 /* complete taskfile transaction */
4171 ata_hsm_qc_complete(qc
, in_wq
);
4183 static void ata_pio_task(void *_data
)
4185 struct ata_queued_cmd
*qc
= _data
;
4186 struct ata_port
*ap
= qc
->ap
;
4191 WARN_ON(ap
->hsm_task_state
== HSM_ST_IDLE
);
4194 * This is purely heuristic. This is a fast path.
4195 * Sometimes when we enter, BSY will be cleared in
4196 * a chk-status or two. If not, the drive is probably seeking
4197 * or something. Snooze for a couple msecs, then
4198 * chk-status again. If still busy, queue delayed work.
4200 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
4201 if (status
& ATA_BUSY
) {
4203 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
4204 if (status
& ATA_BUSY
) {
4205 ata_port_queue_task(ap
, ata_pio_task
, qc
, ATA_SHORT_PAUSE
);
4211 poll_next
= ata_hsm_move(ap
, qc
, status
, 1);
4213 /* another command or interrupt handler
4214 * may be running at this point.
4221 * ata_qc_new - Request an available ATA command, for queueing
4222 * @ap: Port associated with device @dev
4223 * @dev: Device from whom we request an available command structure
4229 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4231 struct ata_queued_cmd
*qc
= NULL
;
4234 /* no command while frozen */
4235 if (unlikely(ap
->flags
& ATA_FLAG_FROZEN
))
4238 /* the last tag is reserved for internal command. */
4239 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4240 if (!test_and_set_bit(i
, &ap
->qc_allocated
)) {
4241 qc
= __ata_qc_from_tag(ap
, i
);
4252 * ata_qc_new_init - Request an available ATA command, and initialize it
4253 * @dev: Device from whom we request an available command structure
4259 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4261 struct ata_port
*ap
= dev
->ap
;
4262 struct ata_queued_cmd
*qc
;
4264 qc
= ata_qc_new(ap
);
4277 * ata_qc_free - free unused ata_queued_cmd
4278 * @qc: Command to complete
4280 * Designed to free unused ata_queued_cmd object
4281 * in case something prevents using it.
4284 * spin_lock_irqsave(host_set lock)
4286 void ata_qc_free(struct ata_queued_cmd
*qc
)
4288 struct ata_port
*ap
= qc
->ap
;
4291 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4295 if (likely(ata_tag_valid(tag
))) {
4296 qc
->tag
= ATA_TAG_POISON
;
4297 clear_bit(tag
, &ap
->qc_allocated
);
4301 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4303 struct ata_port
*ap
= qc
->ap
;
4305 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4306 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4308 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4311 /* command should be marked inactive atomically with qc completion */
4312 if (qc
->tf
.protocol
== ATA_PROT_NCQ
)
4313 ap
->sactive
&= ~(1 << qc
->tag
);
4315 ap
->active_tag
= ATA_TAG_POISON
;
4317 /* atapi: mark qc as inactive to prevent the interrupt handler
4318 * from completing the command twice later, before the error handler
4319 * is called. (when rc != 0 and atapi request sense is needed)
4321 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4322 ap
->qc_active
&= ~(1 << qc
->tag
);
4324 /* call completion callback */
4325 qc
->complete_fn(qc
);
4329 * ata_qc_complete - Complete an active ATA command
4330 * @qc: Command to complete
4331 * @err_mask: ATA Status register contents
4333 * Indicate to the mid and upper layers that an ATA
4334 * command has completed, with either an ok or not-ok status.
4337 * spin_lock_irqsave(host_set lock)
4339 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4341 struct ata_port
*ap
= qc
->ap
;
4343 /* XXX: New EH and old EH use different mechanisms to
4344 * synchronize EH with regular execution path.
4346 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4347 * Normal execution path is responsible for not accessing a
4348 * failed qc. libata core enforces the rule by returning NULL
4349 * from ata_qc_from_tag() for failed qcs.
4351 * Old EH depends on ata_qc_complete() nullifying completion
4352 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4353 * not synchronize with interrupt handler. Only PIO task is
4356 if (ap
->ops
->error_handler
) {
4357 WARN_ON(ap
->flags
& ATA_FLAG_FROZEN
);
4359 if (unlikely(qc
->err_mask
))
4360 qc
->flags
|= ATA_QCFLAG_FAILED
;
4362 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4363 if (!ata_tag_internal(qc
->tag
)) {
4364 /* always fill result TF for failed qc */
4365 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4366 ata_qc_schedule_eh(qc
);
4371 /* read result TF if requested */
4372 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4373 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4375 __ata_qc_complete(qc
);
4377 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4380 /* read result TF if failed or requested */
4381 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4382 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4384 __ata_qc_complete(qc
);
4389 * ata_qc_complete_multiple - Complete multiple qcs successfully
4390 * @ap: port in question
4391 * @qc_active: new qc_active mask
4392 * @finish_qc: LLDD callback invoked before completing a qc
4394 * Complete in-flight commands. This functions is meant to be
4395 * called from low-level driver's interrupt routine to complete
4396 * requests normally. ap->qc_active and @qc_active is compared
4397 * and commands are completed accordingly.
4400 * spin_lock_irqsave(host_set lock)
4403 * Number of completed commands on success, -errno otherwise.
4405 int ata_qc_complete_multiple(struct ata_port
*ap
, u32 qc_active
,
4406 void (*finish_qc
)(struct ata_queued_cmd
*))
4412 done_mask
= ap
->qc_active
^ qc_active
;
4414 if (unlikely(done_mask
& qc_active
)) {
4415 ata_port_printk(ap
, KERN_ERR
, "illegal qc_active transition "
4416 "(%08x->%08x)\n", ap
->qc_active
, qc_active
);
4420 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
4421 struct ata_queued_cmd
*qc
;
4423 if (!(done_mask
& (1 << i
)))
4426 if ((qc
= ata_qc_from_tag(ap
, i
))) {
4429 ata_qc_complete(qc
);
4437 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4439 struct ata_port
*ap
= qc
->ap
;
4441 switch (qc
->tf
.protocol
) {
4444 case ATA_PROT_ATAPI_DMA
:
4447 case ATA_PROT_ATAPI
:
4449 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4462 * ata_qc_issue - issue taskfile to device
4463 * @qc: command to issue to device
4465 * Prepare an ATA command to submission to device.
4466 * This includes mapping the data into a DMA-able
4467 * area, filling in the S/G table, and finally
4468 * writing the taskfile to hardware, starting the command.
4471 * spin_lock_irqsave(host_set lock)
4473 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4475 struct ata_port
*ap
= qc
->ap
;
4477 /* Make sure only one non-NCQ command is outstanding. The
4478 * check is skipped for old EH because it reuses active qc to
4479 * request ATAPI sense.
4481 WARN_ON(ap
->ops
->error_handler
&& ata_tag_valid(ap
->active_tag
));
4483 if (qc
->tf
.protocol
== ATA_PROT_NCQ
) {
4484 WARN_ON(ap
->sactive
& (1 << qc
->tag
));
4485 ap
->sactive
|= 1 << qc
->tag
;
4487 WARN_ON(ap
->sactive
);
4488 ap
->active_tag
= qc
->tag
;
4491 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4492 ap
->qc_active
|= 1 << qc
->tag
;
4494 if (ata_should_dma_map(qc
)) {
4495 if (qc
->flags
& ATA_QCFLAG_SG
) {
4496 if (ata_sg_setup(qc
))
4498 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4499 if (ata_sg_setup_one(qc
))
4503 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4506 ap
->ops
->qc_prep(qc
);
4508 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4509 if (unlikely(qc
->err_mask
))
4514 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4515 qc
->err_mask
|= AC_ERR_SYSTEM
;
4517 ata_qc_complete(qc
);
4521 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4522 * @qc: command to issue to device
4524 * Using various libata functions and hooks, this function
4525 * starts an ATA command. ATA commands are grouped into
4526 * classes called "protocols", and issuing each type of protocol
4527 * is slightly different.
4529 * May be used as the qc_issue() entry in ata_port_operations.
4532 * spin_lock_irqsave(host_set lock)
4535 * Zero on success, AC_ERR_* mask on failure
4538 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4540 struct ata_port
*ap
= qc
->ap
;
4542 /* Use polling pio if the LLD doesn't handle
4543 * interrupt driven pio and atapi CDB interrupt.
4545 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4546 switch (qc
->tf
.protocol
) {
4548 case ATA_PROT_ATAPI
:
4549 case ATA_PROT_ATAPI_NODATA
:
4550 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4552 case ATA_PROT_ATAPI_DMA
:
4553 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4554 /* see ata_check_atapi_dma() */
4562 /* select the device */
4563 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4565 /* start the command */
4566 switch (qc
->tf
.protocol
) {
4567 case ATA_PROT_NODATA
:
4568 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4569 ata_qc_set_polling(qc
);
4571 ata_tf_to_host(ap
, &qc
->tf
);
4572 ap
->hsm_task_state
= HSM_ST_LAST
;
4574 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4575 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4580 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4582 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4583 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4584 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4585 ap
->hsm_task_state
= HSM_ST_LAST
;
4589 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4590 ata_qc_set_polling(qc
);
4592 ata_tf_to_host(ap
, &qc
->tf
);
4594 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4595 /* PIO data out protocol */
4596 ap
->hsm_task_state
= HSM_ST_FIRST
;
4597 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4599 /* always send first data block using
4600 * the ata_pio_task() codepath.
4603 /* PIO data in protocol */
4604 ap
->hsm_task_state
= HSM_ST
;
4606 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4607 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4609 /* if polling, ata_pio_task() handles the rest.
4610 * otherwise, interrupt handler takes over from here.
4616 case ATA_PROT_ATAPI
:
4617 case ATA_PROT_ATAPI_NODATA
:
4618 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4619 ata_qc_set_polling(qc
);
4621 ata_tf_to_host(ap
, &qc
->tf
);
4623 ap
->hsm_task_state
= HSM_ST_FIRST
;
4625 /* send cdb by polling if no cdb interrupt */
4626 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4627 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4628 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4631 case ATA_PROT_ATAPI_DMA
:
4632 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4634 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4635 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4636 ap
->hsm_task_state
= HSM_ST_FIRST
;
4638 /* send cdb by polling if no cdb interrupt */
4639 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4640 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4645 return AC_ERR_SYSTEM
;
4652 * ata_host_intr - Handle host interrupt for given (port, task)
4653 * @ap: Port on which interrupt arrived (possibly...)
4654 * @qc: Taskfile currently active in engine
4656 * Handle host interrupt for given queued command. Currently,
4657 * only DMA interrupts are handled. All other commands are
4658 * handled via polling with interrupts disabled (nIEN bit).
4661 * spin_lock_irqsave(host_set lock)
4664 * One if interrupt was handled, zero if not (shared irq).
4667 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4668 struct ata_queued_cmd
*qc
)
4670 u8 status
, host_stat
= 0;
4672 VPRINTK("ata%u: protocol %d task_state %d\n",
4673 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4675 /* Check whether we are expecting interrupt in this state */
4676 switch (ap
->hsm_task_state
) {
4678 /* Some pre-ATAPI-4 devices assert INTRQ
4679 * at this state when ready to receive CDB.
4682 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4683 * The flag was turned on only for atapi devices.
4684 * No need to check is_atapi_taskfile(&qc->tf) again.
4686 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4690 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4691 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4692 /* check status of DMA engine */
4693 host_stat
= ap
->ops
->bmdma_status(ap
);
4694 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4696 /* if it's not our irq... */
4697 if (!(host_stat
& ATA_DMA_INTR
))
4700 /* before we do anything else, clear DMA-Start bit */
4701 ap
->ops
->bmdma_stop(qc
);
4703 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4704 /* error when transfering data to/from memory */
4705 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4706 ap
->hsm_task_state
= HSM_ST_ERR
;
4716 /* check altstatus */
4717 status
= ata_altstatus(ap
);
4718 if (status
& ATA_BUSY
)
4721 /* check main status, clearing INTRQ */
4722 status
= ata_chk_status(ap
);
4723 if (unlikely(status
& ATA_BUSY
))
4726 /* ack bmdma irq events */
4727 ap
->ops
->irq_clear(ap
);
4729 ata_hsm_move(ap
, qc
, status
, 0);
4730 return 1; /* irq handled */
4733 ap
->stats
.idle_irq
++;
4736 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4737 ata_irq_ack(ap
, 0); /* debug trap */
4738 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4742 return 0; /* irq not handled */
4746 * ata_interrupt - Default ATA host interrupt handler
4747 * @irq: irq line (unused)
4748 * @dev_instance: pointer to our ata_host_set information structure
4751 * Default interrupt handler for PCI IDE devices. Calls
4752 * ata_host_intr() for each port that is not disabled.
4755 * Obtains host_set lock during operation.
4758 * IRQ_NONE or IRQ_HANDLED.
4761 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4763 struct ata_host_set
*host_set
= dev_instance
;
4765 unsigned int handled
= 0;
4766 unsigned long flags
;
4768 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4769 spin_lock_irqsave(&host_set
->lock
, flags
);
4771 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4772 struct ata_port
*ap
;
4774 ap
= host_set
->ports
[i
];
4776 !(ap
->flags
& ATA_FLAG_DISABLED
)) {
4777 struct ata_queued_cmd
*qc
;
4779 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4780 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4781 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4782 handled
|= ata_host_intr(ap
, qc
);
4786 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4788 return IRQ_RETVAL(handled
);
4792 * sata_scr_valid - test whether SCRs are accessible
4793 * @ap: ATA port to test SCR accessibility for
4795 * Test whether SCRs are accessible for @ap.
4801 * 1 if SCRs are accessible, 0 otherwise.
4803 int sata_scr_valid(struct ata_port
*ap
)
4805 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4809 * sata_scr_read - read SCR register of the specified port
4810 * @ap: ATA port to read SCR for
4812 * @val: Place to store read value
4814 * Read SCR register @reg of @ap into *@val. This function is
4815 * guaranteed to succeed if the cable type of the port is SATA
4816 * and the port implements ->scr_read.
4822 * 0 on success, negative errno on failure.
4824 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4826 if (sata_scr_valid(ap
)) {
4827 *val
= ap
->ops
->scr_read(ap
, reg
);
4834 * sata_scr_write - write SCR register of the specified port
4835 * @ap: ATA port to write SCR for
4836 * @reg: SCR to write
4837 * @val: value to write
4839 * Write @val to SCR register @reg of @ap. This function is
4840 * guaranteed to succeed if the cable type of the port is SATA
4841 * and the port implements ->scr_read.
4847 * 0 on success, negative errno on failure.
4849 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4851 if (sata_scr_valid(ap
)) {
4852 ap
->ops
->scr_write(ap
, reg
, val
);
4859 * sata_scr_write_flush - write SCR register of the specified port and flush
4860 * @ap: ATA port to write SCR for
4861 * @reg: SCR to write
4862 * @val: value to write
4864 * This function is identical to sata_scr_write() except that this
4865 * function performs flush after writing to the register.
4871 * 0 on success, negative errno on failure.
4873 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4875 if (sata_scr_valid(ap
)) {
4876 ap
->ops
->scr_write(ap
, reg
, val
);
4877 ap
->ops
->scr_read(ap
, reg
);
4884 * ata_port_online - test whether the given port is online
4885 * @ap: ATA port to test
4887 * Test whether @ap is online. Note that this function returns 0
4888 * if online status of @ap cannot be obtained, so
4889 * ata_port_online(ap) != !ata_port_offline(ap).
4895 * 1 if the port online status is available and online.
4897 int ata_port_online(struct ata_port
*ap
)
4901 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4907 * ata_port_offline - test whether the given port is offline
4908 * @ap: ATA port to test
4910 * Test whether @ap is offline. Note that this function returns
4911 * 0 if offline status of @ap cannot be obtained, so
4912 * ata_port_online(ap) != !ata_port_offline(ap).
4918 * 1 if the port offline status is available and offline.
4920 int ata_port_offline(struct ata_port
*ap
)
4924 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4930 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4931 * without filling any other registers
4933 static int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
4935 struct ata_taskfile tf
;
4938 ata_tf_init(dev
, &tf
);
4941 tf
.flags
|= ATA_TFLAG_DEVICE
;
4942 tf
.protocol
= ATA_PROT_NODATA
;
4944 err
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
4946 ata_dev_printk(dev
, KERN_ERR
, "%s: ata command failed: %d\n",
4952 static int ata_flush_cache(struct ata_device
*dev
)
4956 if (!ata_try_flush_cache(dev
))
4959 if (ata_id_has_flush_ext(dev
->id
))
4960 cmd
= ATA_CMD_FLUSH_EXT
;
4962 cmd
= ATA_CMD_FLUSH
;
4964 return ata_do_simple_cmd(dev
, cmd
);
4967 static int ata_standby_drive(struct ata_device
*dev
)
4969 return ata_do_simple_cmd(dev
, ATA_CMD_STANDBYNOW1
);
4972 static int ata_start_drive(struct ata_device
*dev
)
4974 return ata_do_simple_cmd(dev
, ATA_CMD_IDLEIMMEDIATE
);
4978 * ata_device_resume - wakeup a previously suspended devices
4979 * @dev: the device to resume
4981 * Kick the drive back into action, by sending it an idle immediate
4982 * command and making sure its transfer mode matches between drive
4986 int ata_device_resume(struct ata_device
*dev
)
4988 struct ata_port
*ap
= dev
->ap
;
4990 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4991 struct ata_device
*failed_dev
;
4993 ata_busy_wait(ap
, ATA_BUSY
| ATA_DRQ
, 200000);
4995 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4996 while (ata_set_mode(ap
, &failed_dev
))
4997 ata_dev_disable(failed_dev
);
4999 if (!ata_dev_enabled(dev
))
5001 if (dev
->class == ATA_DEV_ATA
)
5002 ata_start_drive(dev
);
5008 * ata_device_suspend - prepare a device for suspend
5009 * @dev: the device to suspend
5010 * @state: target power management state
5012 * Flush the cache on the drive, if appropriate, then issue a
5013 * standbynow command.
5015 int ata_device_suspend(struct ata_device
*dev
, pm_message_t state
)
5017 struct ata_port
*ap
= dev
->ap
;
5019 if (!ata_dev_enabled(dev
))
5021 if (dev
->class == ATA_DEV_ATA
)
5022 ata_flush_cache(dev
);
5024 if (state
.event
!= PM_EVENT_FREEZE
)
5025 ata_standby_drive(dev
);
5026 ap
->flags
|= ATA_FLAG_SUSPENDED
;
5031 * ata_port_start - Set port up for dma.
5032 * @ap: Port to initialize
5034 * Called just after data structures for each port are
5035 * initialized. Allocates space for PRD table.
5037 * May be used as the port_start() entry in ata_port_operations.
5040 * Inherited from caller.
5043 int ata_port_start (struct ata_port
*ap
)
5045 struct device
*dev
= ap
->dev
;
5048 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
5052 rc
= ata_pad_alloc(ap
, dev
);
5054 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5058 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
5065 * ata_port_stop - Undo ata_port_start()
5066 * @ap: Port to shut down
5068 * Frees the PRD table.
5070 * May be used as the port_stop() entry in ata_port_operations.
5073 * Inherited from caller.
5076 void ata_port_stop (struct ata_port
*ap
)
5078 struct device
*dev
= ap
->dev
;
5080 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5081 ata_pad_free(ap
, dev
);
5084 void ata_host_stop (struct ata_host_set
*host_set
)
5086 if (host_set
->mmio_base
)
5087 iounmap(host_set
->mmio_base
);
5092 * ata_host_remove - Unregister SCSI host structure with upper layers
5093 * @ap: Port to unregister
5094 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
5097 * Inherited from caller.
5100 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
5102 struct Scsi_Host
*sh
= ap
->host
;
5107 scsi_remove_host(sh
);
5109 ap
->ops
->port_stop(ap
);
5113 * ata_dev_init - Initialize an ata_device structure
5114 * @dev: Device structure to initialize
5116 * Initialize @dev in preparation for probing.
5119 * Inherited from caller.
5121 void ata_dev_init(struct ata_device
*dev
)
5123 struct ata_port
*ap
= dev
->ap
;
5124 unsigned long flags
;
5126 /* SATA spd limit is bound to the first device */
5127 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5129 /* High bits of dev->flags are used to record warm plug
5130 * requests which occur asynchronously. Synchronize using
5133 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
5134 dev
->flags
&= ~ATA_DFLAG_INIT_MASK
;
5135 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
5137 memset((void *)dev
+ ATA_DEVICE_CLEAR_OFFSET
, 0,
5138 sizeof(*dev
) - ATA_DEVICE_CLEAR_OFFSET
);
5139 dev
->pio_mask
= UINT_MAX
;
5140 dev
->mwdma_mask
= UINT_MAX
;
5141 dev
->udma_mask
= UINT_MAX
;
5145 * ata_host_init - Initialize an ata_port structure
5146 * @ap: Structure to initialize
5147 * @host: associated SCSI mid-layer structure
5148 * @host_set: Collection of hosts to which @ap belongs
5149 * @ent: Probe information provided by low-level driver
5150 * @port_no: Port number associated with this ata_port
5152 * Initialize a new ata_port structure, and its associated
5156 * Inherited from caller.
5158 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
5159 struct ata_host_set
*host_set
,
5160 const struct ata_probe_ent
*ent
, unsigned int port_no
)
5166 host
->max_channel
= 1;
5167 host
->unique_id
= ata_unique_id
++;
5168 host
->max_cmd_len
= 12;
5170 ap
->flags
= ATA_FLAG_DISABLED
;
5171 ap
->id
= host
->unique_id
;
5173 ap
->ctl
= ATA_DEVCTL_OBS
;
5174 ap
->host_set
= host_set
;
5176 ap
->port_no
= port_no
;
5178 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
5179 ap
->pio_mask
= ent
->pio_mask
;
5180 ap
->mwdma_mask
= ent
->mwdma_mask
;
5181 ap
->udma_mask
= ent
->udma_mask
;
5182 ap
->flags
|= ent
->host_flags
;
5183 ap
->ops
= ent
->port_ops
;
5184 ap
->hw_sata_spd_limit
= UINT_MAX
;
5185 ap
->active_tag
= ATA_TAG_POISON
;
5186 ap
->last_ctl
= 0xFF;
5188 #if defined(ATA_VERBOSE_DEBUG)
5189 /* turn on all debugging levels */
5190 ap
->msg_enable
= 0x00FF;
5191 #elif defined(ATA_DEBUG)
5192 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_INFO
| ATA_MSG_CTL
| ATA_MSG_WARN
| ATA_MSG_ERR
;
5194 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_ERR
;
5197 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
5198 INIT_WORK(&ap
->hotplug_task
, ata_scsi_hotplug
, ap
);
5199 INIT_WORK(&ap
->scsi_rescan_task
, ata_scsi_dev_rescan
, ap
);
5200 INIT_LIST_HEAD(&ap
->eh_done_q
);
5201 init_waitqueue_head(&ap
->eh_wait_q
);
5203 /* set cable type */
5204 ap
->cbl
= ATA_CBL_NONE
;
5205 if (ap
->flags
& ATA_FLAG_SATA
)
5206 ap
->cbl
= ATA_CBL_SATA
;
5208 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
5209 struct ata_device
*dev
= &ap
->device
[i
];
5216 ap
->stats
.unhandled_irq
= 1;
5217 ap
->stats
.idle_irq
= 1;
5220 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
5224 * ata_host_add - Attach low-level ATA driver to system
5225 * @ent: Information provided by low-level driver
5226 * @host_set: Collections of ports to which we add
5227 * @port_no: Port number associated with this host
5229 * Attach low-level ATA driver to system.
5232 * PCI/etc. bus probe sem.
5235 * New ata_port on success, for NULL on error.
5238 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
5239 struct ata_host_set
*host_set
,
5240 unsigned int port_no
)
5242 struct Scsi_Host
*host
;
5243 struct ata_port
*ap
;
5248 if (!ent
->port_ops
->error_handler
&&
5249 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
5250 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
5255 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
5259 host
->transportt
= &ata_scsi_transport_template
;
5261 ap
= ata_shost_to_port(host
);
5263 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
5265 rc
= ap
->ops
->port_start(ap
);
5272 scsi_host_put(host
);
5277 * ata_device_add - Register hardware device with ATA and SCSI layers
5278 * @ent: Probe information describing hardware device to be registered
5280 * This function processes the information provided in the probe
5281 * information struct @ent, allocates the necessary ATA and SCSI
5282 * host information structures, initializes them, and registers
5283 * everything with requisite kernel subsystems.
5285 * This function requests irqs, probes the ATA bus, and probes
5289 * PCI/etc. bus probe sem.
5292 * Number of ports registered. Zero on error (no ports registered).
5294 int ata_device_add(const struct ata_probe_ent
*ent
)
5296 unsigned int count
= 0, i
;
5297 struct device
*dev
= ent
->dev
;
5298 struct ata_host_set
*host_set
;
5302 /* alloc a container for our list of ATA ports (buses) */
5303 host_set
= kzalloc(sizeof(struct ata_host_set
) +
5304 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
5307 spin_lock_init(&host_set
->lock
);
5309 host_set
->dev
= dev
;
5310 host_set
->n_ports
= ent
->n_ports
;
5311 host_set
->irq
= ent
->irq
;
5312 host_set
->mmio_base
= ent
->mmio_base
;
5313 host_set
->private_data
= ent
->private_data
;
5314 host_set
->ops
= ent
->port_ops
;
5315 host_set
->flags
= ent
->host_set_flags
;
5317 /* register each port bound to this device */
5318 for (i
= 0; i
< ent
->n_ports
; i
++) {
5319 struct ata_port
*ap
;
5320 unsigned long xfer_mode_mask
;
5322 ap
= ata_host_add(ent
, host_set
, i
);
5326 host_set
->ports
[i
] = ap
;
5327 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
5328 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
5329 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
5331 /* print per-port info to dmesg */
5332 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
5333 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
5334 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
5335 ata_mode_string(xfer_mode_mask
),
5336 ap
->ioaddr
.cmd_addr
,
5337 ap
->ioaddr
.ctl_addr
,
5338 ap
->ioaddr
.bmdma_addr
,
5342 host_set
->ops
->irq_clear(ap
);
5343 ata_eh_freeze_port(ap
); /* freeze port before requesting IRQ */
5350 /* obtain irq, that is shared between channels */
5351 rc
= request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5352 DRV_NAME
, host_set
);
5354 dev_printk(KERN_ERR
, dev
, "irq %lu request failed: %d\n",
5359 /* perform each probe synchronously */
5360 DPRINTK("probe begin\n");
5361 for (i
= 0; i
< count
; i
++) {
5362 struct ata_port
*ap
;
5366 ap
= host_set
->ports
[i
];
5368 /* init sata_spd_limit to the current value */
5369 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
5370 int spd
= (scontrol
>> 4) & 0xf;
5371 ap
->hw_sata_spd_limit
&= (1 << spd
) - 1;
5373 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5375 rc
= scsi_add_host(ap
->host
, dev
);
5377 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
5378 /* FIXME: do something useful here */
5379 /* FIXME: handle unconditional calls to
5380 * scsi_scan_host and ata_host_remove, below,
5385 if (ap
->ops
->error_handler
) {
5386 unsigned long flags
;
5390 /* kick EH for boot probing */
5391 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
5393 ap
->eh_info
.probe_mask
= (1 << ATA_MAX_DEVICES
) - 1;
5394 ap
->eh_info
.action
|= ATA_EH_SOFTRESET
;
5396 ap
->flags
|= ATA_FLAG_LOADING
;
5397 ata_port_schedule_eh(ap
);
5399 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
5401 /* wait for EH to finish */
5402 ata_port_wait_eh(ap
);
5404 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5405 rc
= ata_bus_probe(ap
);
5406 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5409 /* FIXME: do something useful here?
5410 * Current libata behavior will
5411 * tear down everything when
5412 * the module is removed
5413 * or the h/w is unplugged.
5419 /* probes are done, now scan each port's disk(s) */
5420 DPRINTK("host probe begin\n");
5421 for (i
= 0; i
< count
; i
++) {
5422 struct ata_port
*ap
= host_set
->ports
[i
];
5424 ata_scsi_scan_host(ap
);
5427 dev_set_drvdata(dev
, host_set
);
5429 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5430 return ent
->n_ports
; /* success */
5433 for (i
= 0; i
< count
; i
++) {
5434 ata_host_remove(host_set
->ports
[i
], 1);
5435 scsi_host_put(host_set
->ports
[i
]->host
);
5439 VPRINTK("EXIT, returning 0\n");
5444 * ata_port_detach - Detach ATA port in prepration of device removal
5445 * @ap: ATA port to be detached
5447 * Detach all ATA devices and the associated SCSI devices of @ap;
5448 * then, remove the associated SCSI host. @ap is guaranteed to
5449 * be quiescent on return from this function.
5452 * Kernel thread context (may sleep).
5454 void ata_port_detach(struct ata_port
*ap
)
5456 unsigned long flags
;
5459 if (!ap
->ops
->error_handler
)
5462 /* tell EH we're leaving & flush EH */
5463 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
5464 ap
->flags
|= ATA_FLAG_UNLOADING
;
5465 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
5467 ata_port_wait_eh(ap
);
5469 /* EH is now guaranteed to see UNLOADING, so no new device
5470 * will be attached. Disable all existing devices.
5472 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
5474 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
5475 ata_dev_disable(&ap
->device
[i
]);
5477 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
5479 /* Final freeze & EH. All in-flight commands are aborted. EH
5480 * will be skipped and retrials will be terminated with bad
5483 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
5484 ata_port_freeze(ap
); /* won't be thawed */
5485 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
5487 ata_port_wait_eh(ap
);
5489 /* Flush hotplug task. The sequence is similar to
5490 * ata_port_flush_task().
5492 flush_workqueue(ata_aux_wq
);
5493 cancel_delayed_work(&ap
->hotplug_task
);
5494 flush_workqueue(ata_aux_wq
);
5496 /* remove the associated SCSI host */
5497 scsi_remove_host(ap
->host
);
5501 * ata_host_set_remove - PCI layer callback for device removal
5502 * @host_set: ATA host set that was removed
5504 * Unregister all objects associated with this host set. Free those
5508 * Inherited from calling layer (may sleep).
5511 void ata_host_set_remove(struct ata_host_set
*host_set
)
5515 for (i
= 0; i
< host_set
->n_ports
; i
++)
5516 ata_port_detach(host_set
->ports
[i
]);
5518 free_irq(host_set
->irq
, host_set
);
5520 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5521 struct ata_port
*ap
= host_set
->ports
[i
];
5523 ata_scsi_release(ap
->host
);
5525 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5526 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5528 if (ioaddr
->cmd_addr
== 0x1f0)
5529 release_region(0x1f0, 8);
5530 else if (ioaddr
->cmd_addr
== 0x170)
5531 release_region(0x170, 8);
5534 scsi_host_put(ap
->host
);
5537 if (host_set
->ops
->host_stop
)
5538 host_set
->ops
->host_stop(host_set
);
5544 * ata_scsi_release - SCSI layer callback hook for host unload
5545 * @host: libata host to be unloaded
5547 * Performs all duties necessary to shut down a libata port...
5548 * Kill port kthread, disable port, and release resources.
5551 * Inherited from SCSI layer.
5557 int ata_scsi_release(struct Scsi_Host
*host
)
5559 struct ata_port
*ap
= ata_shost_to_port(host
);
5563 ap
->ops
->port_disable(ap
);
5564 ata_host_remove(ap
, 0);
5571 * ata_std_ports - initialize ioaddr with standard port offsets.
5572 * @ioaddr: IO address structure to be initialized
5574 * Utility function which initializes data_addr, error_addr,
5575 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5576 * device_addr, status_addr, and command_addr to standard offsets
5577 * relative to cmd_addr.
5579 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5582 void ata_std_ports(struct ata_ioports
*ioaddr
)
5584 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5585 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5586 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5587 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5588 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5589 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5590 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5591 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5592 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5593 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5599 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5601 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5603 pci_iounmap(pdev
, host_set
->mmio_base
);
5607 * ata_pci_remove_one - PCI layer callback for device removal
5608 * @pdev: PCI device that was removed
5610 * PCI layer indicates to libata via this hook that
5611 * hot-unplug or module unload event has occurred.
5612 * Handle this by unregistering all objects associated
5613 * with this PCI device. Free those objects. Then finally
5614 * release PCI resources and disable device.
5617 * Inherited from PCI layer (may sleep).
5620 void ata_pci_remove_one (struct pci_dev
*pdev
)
5622 struct device
*dev
= pci_dev_to_dev(pdev
);
5623 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5625 ata_host_set_remove(host_set
);
5626 pci_release_regions(pdev
);
5627 pci_disable_device(pdev
);
5628 dev_set_drvdata(dev
, NULL
);
5631 /* move to PCI subsystem */
5632 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5634 unsigned long tmp
= 0;
5636 switch (bits
->width
) {
5639 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5645 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5651 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5662 return (tmp
== bits
->val
) ? 1 : 0;
5665 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5667 pci_save_state(pdev
);
5668 pci_disable_device(pdev
);
5669 pci_set_power_state(pdev
, PCI_D3hot
);
5673 int ata_pci_device_resume(struct pci_dev
*pdev
)
5675 pci_set_power_state(pdev
, PCI_D0
);
5676 pci_restore_state(pdev
);
5677 pci_enable_device(pdev
);
5678 pci_set_master(pdev
);
5681 #endif /* CONFIG_PCI */
5684 static int __init
ata_init(void)
5686 ata_wq
= create_workqueue("ata");
5690 ata_aux_wq
= create_singlethread_workqueue("ata_aux");
5692 destroy_workqueue(ata_wq
);
5696 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5700 static void __exit
ata_exit(void)
5702 destroy_workqueue(ata_wq
);
5703 destroy_workqueue(ata_aux_wq
);
5706 module_init(ata_init
);
5707 module_exit(ata_exit
);
5709 static unsigned long ratelimit_time
;
5710 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5712 int ata_ratelimit(void)
5715 unsigned long flags
;
5717 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5719 if (time_after(jiffies
, ratelimit_time
)) {
5721 ratelimit_time
= jiffies
+ (HZ
/5);
5725 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5731 * ata_wait_register - wait until register value changes
5732 * @reg: IO-mapped register
5733 * @mask: Mask to apply to read register value
5734 * @val: Wait condition
5735 * @interval_msec: polling interval in milliseconds
5736 * @timeout_msec: timeout in milliseconds
5738 * Waiting for some bits of register to change is a common
5739 * operation for ATA controllers. This function reads 32bit LE
5740 * IO-mapped register @reg and tests for the following condition.
5742 * (*@reg & mask) != val
5744 * If the condition is met, it returns; otherwise, the process is
5745 * repeated after @interval_msec until timeout.
5748 * Kernel thread context (may sleep)
5751 * The final register value.
5753 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5754 unsigned long interval_msec
,
5755 unsigned long timeout_msec
)
5757 unsigned long timeout
;
5760 tmp
= ioread32(reg
);
5762 /* Calculate timeout _after_ the first read to make sure
5763 * preceding writes reach the controller before starting to
5764 * eat away the timeout.
5766 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5768 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5769 msleep(interval_msec
);
5770 tmp
= ioread32(reg
);
5777 * libata is essentially a library of internal helper functions for
5778 * low-level ATA host controller drivers. As such, the API/ABI is
5779 * likely to change as new drivers are added and updated.
5780 * Do not depend on ABI/API stability.
5783 EXPORT_SYMBOL_GPL(sata_deb_timing_boot
);
5784 EXPORT_SYMBOL_GPL(sata_deb_timing_eh
);
5785 EXPORT_SYMBOL_GPL(sata_deb_timing_before_fsrst
);
5786 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5787 EXPORT_SYMBOL_GPL(ata_std_ports
);
5788 EXPORT_SYMBOL_GPL(ata_device_add
);
5789 EXPORT_SYMBOL_GPL(ata_port_detach
);
5790 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5791 EXPORT_SYMBOL_GPL(ata_sg_init
);
5792 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5793 EXPORT_SYMBOL_GPL(ata_hsm_move
);
5794 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5795 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple
);
5796 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5797 EXPORT_SYMBOL_GPL(ata_tf_load
);
5798 EXPORT_SYMBOL_GPL(ata_tf_read
);
5799 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5800 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5801 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5802 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5803 EXPORT_SYMBOL_GPL(ata_check_status
);
5804 EXPORT_SYMBOL_GPL(ata_altstatus
);
5805 EXPORT_SYMBOL_GPL(ata_exec_command
);
5806 EXPORT_SYMBOL_GPL(ata_port_start
);
5807 EXPORT_SYMBOL_GPL(ata_port_stop
);
5808 EXPORT_SYMBOL_GPL(ata_host_stop
);
5809 EXPORT_SYMBOL_GPL(ata_interrupt
);
5810 EXPORT_SYMBOL_GPL(ata_mmio_data_xfer
);
5811 EXPORT_SYMBOL_GPL(ata_pio_data_xfer
);
5812 EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq
);
5813 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5814 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5815 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5816 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5817 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5818 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5819 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5820 EXPORT_SYMBOL_GPL(ata_bmdma_freeze
);
5821 EXPORT_SYMBOL_GPL(ata_bmdma_thaw
);
5822 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh
);
5823 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler
);
5824 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd
);
5825 EXPORT_SYMBOL_GPL(ata_port_probe
);
5826 EXPORT_SYMBOL_GPL(sata_set_spd
);
5827 EXPORT_SYMBOL_GPL(sata_phy_debounce
);
5828 EXPORT_SYMBOL_GPL(sata_phy_resume
);
5829 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5830 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5831 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5832 EXPORT_SYMBOL_GPL(ata_std_prereset
);
5833 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5834 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5835 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5836 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5837 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5838 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5839 EXPORT_SYMBOL_GPL(ata_port_disable
);
5840 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5841 EXPORT_SYMBOL_GPL(ata_wait_register
);
5842 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5843 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5844 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5845 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5846 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5847 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy
);
5848 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth
);
5849 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5850 EXPORT_SYMBOL_GPL(ata_host_intr
);
5851 EXPORT_SYMBOL_GPL(sata_scr_valid
);
5852 EXPORT_SYMBOL_GPL(sata_scr_read
);
5853 EXPORT_SYMBOL_GPL(sata_scr_write
);
5854 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
5855 EXPORT_SYMBOL_GPL(ata_port_online
);
5856 EXPORT_SYMBOL_GPL(ata_port_offline
);
5857 EXPORT_SYMBOL_GPL(ata_id_string
);
5858 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5859 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5861 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5862 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5863 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5866 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5867 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5868 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5869 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5870 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5871 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5872 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5873 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5874 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5875 #endif /* CONFIG_PCI */
5877 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5878 EXPORT_SYMBOL_GPL(ata_device_resume
);
5879 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5880 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5882 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5883 EXPORT_SYMBOL_GPL(ata_port_schedule_eh
);
5884 EXPORT_SYMBOL_GPL(ata_port_abort
);
5885 EXPORT_SYMBOL_GPL(ata_port_freeze
);
5886 EXPORT_SYMBOL_GPL(ata_eh_freeze_port
);
5887 EXPORT_SYMBOL_GPL(ata_eh_thaw_port
);
5888 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5889 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5890 EXPORT_SYMBOL_GPL(ata_do_eh
);