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 unsigned ata_exec_internal(struct ata_device
*dev
,
987 struct ata_taskfile
*tf
, const u8
*cdb
,
988 int dma_dir
, void *buf
, unsigned int buflen
)
990 struct ata_port
*ap
= dev
->ap
;
991 u8 command
= tf
->command
;
992 struct ata_queued_cmd
*qc
;
993 unsigned int tag
, preempted_tag
;
994 u32 preempted_sactive
, preempted_qc_active
;
995 DECLARE_COMPLETION(wait
);
997 unsigned int err_mask
;
1000 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1002 /* no internal command while frozen */
1003 if (ap
->flags
& ATA_FLAG_FROZEN
) {
1004 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1005 return AC_ERR_SYSTEM
;
1008 /* initialize internal qc */
1010 /* XXX: Tag 0 is used for drivers with legacy EH as some
1011 * drivers choke if any other tag is given. This breaks
1012 * ata_tag_internal() test for those drivers. Don't use new
1013 * EH stuff without converting to it.
1015 if (ap
->ops
->error_handler
)
1016 tag
= ATA_TAG_INTERNAL
;
1020 if (test_and_set_bit(tag
, &ap
->qc_allocated
))
1022 qc
= __ata_qc_from_tag(ap
, tag
);
1030 preempted_tag
= ap
->active_tag
;
1031 preempted_sactive
= ap
->sactive
;
1032 preempted_qc_active
= ap
->qc_active
;
1033 ap
->active_tag
= ATA_TAG_POISON
;
1037 /* prepare & issue qc */
1040 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1041 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1042 qc
->dma_dir
= dma_dir
;
1043 if (dma_dir
!= DMA_NONE
) {
1044 ata_sg_init_one(qc
, buf
, buflen
);
1045 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1048 qc
->private_data
= &wait
;
1049 qc
->complete_fn
= ata_qc_complete_internal
;
1053 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1055 rc
= wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
);
1057 ata_port_flush_task(ap
);
1060 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1062 /* We're racing with irq here. If we lose, the
1063 * following test prevents us from completing the qc
1064 * twice. If we win, the port is frozen and will be
1065 * cleaned up by ->post_internal_cmd().
1067 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1068 qc
->err_mask
|= AC_ERR_TIMEOUT
;
1070 if (ap
->ops
->error_handler
)
1071 ata_port_freeze(ap
);
1073 ata_qc_complete(qc
);
1075 ata_dev_printk(dev
, KERN_WARNING
,
1076 "qc timeout (cmd 0x%x)\n", command
);
1079 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1082 /* do post_internal_cmd */
1083 if (ap
->ops
->post_internal_cmd
)
1084 ap
->ops
->post_internal_cmd(qc
);
1086 if (qc
->flags
& ATA_QCFLAG_FAILED
&& !qc
->err_mask
) {
1087 ata_dev_printk(dev
, KERN_WARNING
, "zero err_mask for failed "
1088 "internal command, assuming AC_ERR_OTHER\n");
1089 qc
->err_mask
|= AC_ERR_OTHER
;
1093 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1095 *tf
= qc
->result_tf
;
1096 err_mask
= qc
->err_mask
;
1099 ap
->active_tag
= preempted_tag
;
1100 ap
->sactive
= preempted_sactive
;
1101 ap
->qc_active
= preempted_qc_active
;
1103 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1104 * Until those drivers are fixed, we detect the condition
1105 * here, fail the command with AC_ERR_SYSTEM and reenable the
1108 * Note that this doesn't change any behavior as internal
1109 * command failure results in disabling the device in the
1110 * higher layer for LLDDs without new reset/EH callbacks.
1112 * Kill the following code as soon as those drivers are fixed.
1114 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1115 err_mask
|= AC_ERR_SYSTEM
;
1119 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1125 * ata_pio_need_iordy - check if iordy needed
1128 * Check if the current speed of the device requires IORDY. Used
1129 * by various controllers for chip configuration.
1132 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1135 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1142 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1144 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1145 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1146 /* Is the speed faster than the drive allows non IORDY ? */
1148 /* This is cycle times not frequency - watch the logic! */
1149 if (pio
> 240) /* PIO2 is 240nS per cycle */
1158 * ata_dev_read_id - Read ID data from the specified device
1159 * @dev: target device
1160 * @p_class: pointer to class of the target device (may be changed)
1161 * @post_reset: is this read ID post-reset?
1162 * @id: buffer to read IDENTIFY data into
1164 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1165 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1166 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1167 * for pre-ATA4 drives.
1170 * Kernel thread context (may sleep)
1173 * 0 on success, -errno otherwise.
1175 int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1176 int post_reset
, u16
*id
)
1178 struct ata_port
*ap
= dev
->ap
;
1179 unsigned int class = *p_class
;
1180 struct ata_taskfile tf
;
1181 unsigned int err_mask
= 0;
1185 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1187 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1190 ata_tf_init(dev
, &tf
);
1194 tf
.command
= ATA_CMD_ID_ATA
;
1197 tf
.command
= ATA_CMD_ID_ATAPI
;
1201 reason
= "unsupported class";
1205 tf
.protocol
= ATA_PROT_PIO
;
1207 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1208 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1211 reason
= "I/O error";
1215 swap_buf_le16(id
, ATA_ID_WORDS
);
1218 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1220 reason
= "device reports illegal type";
1224 if (post_reset
&& class == ATA_DEV_ATA
) {
1226 * The exact sequence expected by certain pre-ATA4 drives is:
1229 * INITIALIZE DEVICE PARAMETERS
1231 * Some drives were very specific about that exact sequence.
1233 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1234 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1237 reason
= "INIT_DEV_PARAMS failed";
1241 /* current CHS translation info (id[53-58]) might be
1242 * changed. reread the identify device info.
1254 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1255 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1259 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1261 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1264 static void ata_dev_config_ncq(struct ata_device
*dev
,
1265 char *desc
, size_t desc_sz
)
1267 struct ata_port
*ap
= dev
->ap
;
1268 int hdepth
= 0, ddepth
= ata_id_queue_depth(dev
->id
);
1270 if (!ata_id_has_ncq(dev
->id
)) {
1275 if (ap
->flags
& ATA_FLAG_NCQ
) {
1276 hdepth
= min(ap
->host
->can_queue
, ATA_MAX_QUEUE
- 1);
1277 dev
->flags
|= ATA_DFLAG_NCQ
;
1280 if (hdepth
>= ddepth
)
1281 snprintf(desc
, desc_sz
, "NCQ (depth %d)", ddepth
);
1283 snprintf(desc
, desc_sz
, "NCQ (depth %d/%d)", hdepth
, ddepth
);
1287 * ata_dev_configure - Configure the specified ATA/ATAPI device
1288 * @dev: Target device to configure
1289 * @print_info: Enable device info printout
1291 * Configure @dev according to @dev->id. Generic and low-level
1292 * driver specific fixups are also applied.
1295 * Kernel thread context (may sleep)
1298 * 0 on success, -errno otherwise
1300 int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1302 struct ata_port
*ap
= dev
->ap
;
1303 const u16
*id
= dev
->id
;
1304 unsigned int xfer_mask
;
1307 if (!ata_dev_enabled(dev
)) {
1308 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1309 ap
->id
, dev
->devno
);
1313 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1315 /* print device capabilities */
1317 ata_dev_printk(dev
, KERN_DEBUG
, "cfg 49:%04x 82:%04x 83:%04x "
1318 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1319 id
[49], id
[82], id
[83], id
[84],
1320 id
[85], id
[86], id
[87], id
[88]);
1322 /* initialize to-be-configured parameters */
1323 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1324 dev
->max_sectors
= 0;
1332 * common ATA, ATAPI feature tests
1335 /* find max transfer mode; for printk only */
1336 xfer_mask
= ata_id_xfermask(id
);
1340 /* ATA-specific feature tests */
1341 if (dev
->class == ATA_DEV_ATA
) {
1342 dev
->n_sectors
= ata_id_n_sectors(id
);
1344 if (ata_id_has_lba(id
)) {
1345 const char *lba_desc
;
1349 dev
->flags
|= ATA_DFLAG_LBA
;
1350 if (ata_id_has_lba48(id
)) {
1351 dev
->flags
|= ATA_DFLAG_LBA48
;
1356 ata_dev_config_ncq(dev
, ncq_desc
, sizeof(ncq_desc
));
1358 /* print device info to dmesg */
1360 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1361 "max %s, %Lu sectors: %s %s\n",
1362 ata_id_major_version(id
),
1363 ata_mode_string(xfer_mask
),
1364 (unsigned long long)dev
->n_sectors
,
1365 lba_desc
, ncq_desc
);
1369 /* Default translation */
1370 dev
->cylinders
= id
[1];
1372 dev
->sectors
= id
[6];
1374 if (ata_id_current_chs_valid(id
)) {
1375 /* Current CHS translation is valid. */
1376 dev
->cylinders
= id
[54];
1377 dev
->heads
= id
[55];
1378 dev
->sectors
= id
[56];
1381 /* print device info to dmesg */
1383 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1384 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1385 ata_id_major_version(id
),
1386 ata_mode_string(xfer_mask
),
1387 (unsigned long long)dev
->n_sectors
,
1388 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1391 if (dev
->id
[59] & 0x100) {
1392 dev
->multi_count
= dev
->id
[59] & 0xff;
1393 DPRINTK("ata%u: dev %u multi count %u\n",
1394 ap
->id
, dev
->devno
, dev
->multi_count
);
1400 /* ATAPI-specific feature tests */
1401 else if (dev
->class == ATA_DEV_ATAPI
) {
1402 char *cdb_intr_string
= "";
1404 rc
= atapi_cdb_len(id
);
1405 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1406 ata_dev_printk(dev
, KERN_WARNING
,
1407 "unsupported CDB len\n");
1411 dev
->cdb_len
= (unsigned int) rc
;
1413 if (ata_id_cdb_intr(dev
->id
)) {
1414 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1415 cdb_intr_string
= ", CDB intr";
1418 /* print device info to dmesg */
1420 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s%s\n",
1421 ata_mode_string(xfer_mask
),
1425 ap
->host
->max_cmd_len
= 0;
1426 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1427 ap
->host
->max_cmd_len
= max_t(unsigned int,
1428 ap
->host
->max_cmd_len
,
1429 ap
->device
[i
].cdb_len
);
1431 /* limit bridge transfers to udma5, 200 sectors */
1432 if (ata_dev_knobble(dev
)) {
1434 ata_dev_printk(dev
, KERN_INFO
,
1435 "applying bridge limits\n");
1436 dev
->udma_mask
&= ATA_UDMA5
;
1437 dev
->max_sectors
= ATA_MAX_SECTORS
;
1440 if (ap
->ops
->dev_config
)
1441 ap
->ops
->dev_config(ap
, dev
);
1443 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1447 DPRINTK("EXIT, err\n");
1452 * ata_bus_probe - Reset and probe ATA bus
1455 * Master ATA bus probing function. Initiates a hardware-dependent
1456 * bus reset, then attempts to identify any devices found on
1460 * PCI/etc. bus probe sem.
1463 * Zero on success, negative errno otherwise.
1466 static int ata_bus_probe(struct ata_port
*ap
)
1468 unsigned int classes
[ATA_MAX_DEVICES
];
1469 int tries
[ATA_MAX_DEVICES
];
1470 int i
, rc
, down_xfermask
;
1471 struct ata_device
*dev
;
1475 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1476 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1481 /* reset and determine device classes */
1482 ap
->ops
->phy_reset(ap
);
1484 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1485 dev
= &ap
->device
[i
];
1487 if (!(ap
->flags
& ATA_FLAG_DISABLED
) &&
1488 dev
->class != ATA_DEV_UNKNOWN
)
1489 classes
[dev
->devno
] = dev
->class;
1491 classes
[dev
->devno
] = ATA_DEV_NONE
;
1493 dev
->class = ATA_DEV_UNKNOWN
;
1498 /* after the reset the device state is PIO 0 and the controller
1499 state is undefined. Record the mode */
1501 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1502 ap
->device
[i
].pio_mode
= XFER_PIO_0
;
1504 /* read IDENTIFY page and configure devices */
1505 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1506 dev
= &ap
->device
[i
];
1509 dev
->class = classes
[i
];
1511 if (!ata_dev_enabled(dev
))
1514 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1518 rc
= ata_dev_configure(dev
, 1);
1523 /* configure transfer mode */
1524 rc
= ata_set_mode(ap
, &dev
);
1530 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1531 if (ata_dev_enabled(&ap
->device
[i
]))
1534 /* no device present, disable port */
1535 ata_port_disable(ap
);
1536 ap
->ops
->port_disable(ap
);
1543 tries
[dev
->devno
] = 0;
1546 sata_down_spd_limit(ap
);
1549 tries
[dev
->devno
]--;
1550 if (down_xfermask
&&
1551 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1552 tries
[dev
->devno
] = 0;
1555 if (!tries
[dev
->devno
]) {
1556 ata_down_xfermask_limit(dev
, 1);
1557 ata_dev_disable(dev
);
1564 * ata_port_probe - Mark port as enabled
1565 * @ap: Port for which we indicate enablement
1567 * Modify @ap data structure such that the system
1568 * thinks that the entire port is enabled.
1570 * LOCKING: host_set lock, or some other form of
1574 void ata_port_probe(struct ata_port
*ap
)
1576 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1580 * sata_print_link_status - Print SATA link status
1581 * @ap: SATA port to printk link status about
1583 * This function prints link speed and status of a SATA link.
1588 static void sata_print_link_status(struct ata_port
*ap
)
1590 u32 sstatus
, scontrol
, tmp
;
1592 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1594 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1596 if (ata_port_online(ap
)) {
1597 tmp
= (sstatus
>> 4) & 0xf;
1598 ata_port_printk(ap
, KERN_INFO
,
1599 "SATA link up %s (SStatus %X SControl %X)\n",
1600 sata_spd_string(tmp
), sstatus
, scontrol
);
1602 ata_port_printk(ap
, KERN_INFO
,
1603 "SATA link down (SStatus %X SControl %X)\n",
1609 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1610 * @ap: SATA port associated with target SATA PHY.
1612 * This function issues commands to standard SATA Sxxx
1613 * PHY registers, to wake up the phy (and device), and
1614 * clear any reset condition.
1617 * PCI/etc. bus probe sem.
1620 void __sata_phy_reset(struct ata_port
*ap
)
1623 unsigned long timeout
= jiffies
+ (HZ
* 5);
1625 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1626 /* issue phy wake/reset */
1627 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1628 /* Couldn't find anything in SATA I/II specs, but
1629 * AHCI-1.1 10.4.2 says at least 1 ms. */
1632 /* phy wake/clear reset */
1633 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1635 /* wait for phy to become ready, if necessary */
1638 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1639 if ((sstatus
& 0xf) != 1)
1641 } while (time_before(jiffies
, timeout
));
1643 /* print link status */
1644 sata_print_link_status(ap
);
1646 /* TODO: phy layer with polling, timeouts, etc. */
1647 if (!ata_port_offline(ap
))
1650 ata_port_disable(ap
);
1652 if (ap
->flags
& ATA_FLAG_DISABLED
)
1655 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1656 ata_port_disable(ap
);
1660 ap
->cbl
= ATA_CBL_SATA
;
1664 * sata_phy_reset - Reset SATA bus.
1665 * @ap: SATA port associated with target SATA PHY.
1667 * This function resets the SATA bus, and then probes
1668 * the bus for devices.
1671 * PCI/etc. bus probe sem.
1674 void sata_phy_reset(struct ata_port
*ap
)
1676 __sata_phy_reset(ap
);
1677 if (ap
->flags
& ATA_FLAG_DISABLED
)
1683 * ata_dev_pair - return other device on cable
1686 * Obtain the other device on the same cable, or if none is
1687 * present NULL is returned
1690 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1692 struct ata_port
*ap
= adev
->ap
;
1693 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1694 if (!ata_dev_enabled(pair
))
1700 * ata_port_disable - Disable port.
1701 * @ap: Port to be disabled.
1703 * Modify @ap data structure such that the system
1704 * thinks that the entire port is disabled, and should
1705 * never attempt to probe or communicate with devices
1708 * LOCKING: host_set lock, or some other form of
1712 void ata_port_disable(struct ata_port
*ap
)
1714 ap
->device
[0].class = ATA_DEV_NONE
;
1715 ap
->device
[1].class = ATA_DEV_NONE
;
1716 ap
->flags
|= ATA_FLAG_DISABLED
;
1720 * sata_down_spd_limit - adjust SATA spd limit downward
1721 * @ap: Port to adjust SATA spd limit for
1723 * Adjust SATA spd limit of @ap downward. Note that this
1724 * function only adjusts the limit. The change must be applied
1725 * using sata_set_spd().
1728 * Inherited from caller.
1731 * 0 on success, negative errno on failure
1733 int sata_down_spd_limit(struct ata_port
*ap
)
1735 u32 sstatus
, spd
, mask
;
1738 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1742 mask
= ap
->sata_spd_limit
;
1745 highbit
= fls(mask
) - 1;
1746 mask
&= ~(1 << highbit
);
1748 spd
= (sstatus
>> 4) & 0xf;
1752 mask
&= (1 << spd
) - 1;
1756 ap
->sata_spd_limit
= mask
;
1758 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1759 sata_spd_string(fls(mask
)));
1764 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1768 if (ap
->sata_spd_limit
== UINT_MAX
)
1771 limit
= fls(ap
->sata_spd_limit
);
1773 spd
= (*scontrol
>> 4) & 0xf;
1774 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1776 return spd
!= limit
;
1780 * sata_set_spd_needed - is SATA spd configuration needed
1781 * @ap: Port in question
1783 * Test whether the spd limit in SControl matches
1784 * @ap->sata_spd_limit. This function is used to determine
1785 * whether hardreset is necessary to apply SATA spd
1789 * Inherited from caller.
1792 * 1 if SATA spd configuration is needed, 0 otherwise.
1794 int sata_set_spd_needed(struct ata_port
*ap
)
1798 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1801 return __sata_set_spd_needed(ap
, &scontrol
);
1805 * sata_set_spd - set SATA spd according to spd limit
1806 * @ap: Port to set SATA spd for
1808 * Set SATA spd of @ap according to sata_spd_limit.
1811 * Inherited from caller.
1814 * 0 if spd doesn't need to be changed, 1 if spd has been
1815 * changed. Negative errno if SCR registers are inaccessible.
1817 int sata_set_spd(struct ata_port
*ap
)
1822 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1825 if (!__sata_set_spd_needed(ap
, &scontrol
))
1828 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1835 * This mode timing computation functionality is ported over from
1836 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1839 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1840 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1841 * for PIO 5, which is a nonstandard extension and UDMA6, which
1842 * is currently supported only by Maxtor drives.
1845 static const struct ata_timing ata_timing
[] = {
1847 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1848 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1849 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1850 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1852 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1853 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1854 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1856 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1858 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1859 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1860 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1862 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1863 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1864 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1866 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1867 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1868 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1870 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1871 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1872 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1874 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1879 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1880 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1882 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1884 q
->setup
= EZ(t
->setup
* 1000, T
);
1885 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1886 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1887 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1888 q
->active
= EZ(t
->active
* 1000, T
);
1889 q
->recover
= EZ(t
->recover
* 1000, T
);
1890 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1891 q
->udma
= EZ(t
->udma
* 1000, UT
);
1894 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1895 struct ata_timing
*m
, unsigned int what
)
1897 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1898 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1899 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1900 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1901 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1902 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1903 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1904 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1907 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1909 const struct ata_timing
*t
;
1911 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1912 if (t
->mode
== 0xFF)
1917 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1918 struct ata_timing
*t
, int T
, int UT
)
1920 const struct ata_timing
*s
;
1921 struct ata_timing p
;
1927 if (!(s
= ata_timing_find_mode(speed
)))
1930 memcpy(t
, s
, sizeof(*s
));
1933 * If the drive is an EIDE drive, it can tell us it needs extended
1934 * PIO/MW_DMA cycle timing.
1937 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1938 memset(&p
, 0, sizeof(p
));
1939 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1940 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1941 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1942 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1943 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1945 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1949 * Convert the timing to bus clock counts.
1952 ata_timing_quantize(t
, t
, T
, UT
);
1955 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1956 * S.M.A.R.T * and some other commands. We have to ensure that the
1957 * DMA cycle timing is slower/equal than the fastest PIO timing.
1960 if (speed
> XFER_PIO_4
) {
1961 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1962 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1966 * Lengthen active & recovery time so that cycle time is correct.
1969 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1970 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1971 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1974 if (t
->active
+ t
->recover
< t
->cycle
) {
1975 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1976 t
->recover
= t
->cycle
- t
->active
;
1983 * ata_down_xfermask_limit - adjust dev xfer masks downward
1984 * @dev: Device to adjust xfer masks
1985 * @force_pio0: Force PIO0
1987 * Adjust xfer masks of @dev downward. Note that this function
1988 * does not apply the change. Invoking ata_set_mode() afterwards
1989 * will apply the limit.
1992 * Inherited from caller.
1995 * 0 on success, negative errno on failure
1997 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
1999 unsigned long xfer_mask
;
2002 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
2007 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2008 if (xfer_mask
& ATA_MASK_UDMA
)
2009 xfer_mask
&= ~ATA_MASK_MWDMA
;
2011 highbit
= fls(xfer_mask
) - 1;
2012 xfer_mask
&= ~(1 << highbit
);
2014 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
2018 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2021 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
2022 ata_mode_string(xfer_mask
));
2030 static int ata_dev_set_mode(struct ata_device
*dev
)
2032 unsigned int err_mask
;
2035 dev
->flags
&= ~ATA_DFLAG_PIO
;
2036 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
2037 dev
->flags
|= ATA_DFLAG_PIO
;
2039 err_mask
= ata_dev_set_xfermode(dev
);
2041 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
2042 "(err_mask=0x%x)\n", err_mask
);
2046 rc
= ata_dev_revalidate(dev
, 0);
2050 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2051 dev
->xfer_shift
, (int)dev
->xfer_mode
);
2053 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
2054 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
2059 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2060 * @ap: port on which timings will be programmed
2061 * @r_failed_dev: out paramter for failed device
2063 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2064 * ata_set_mode() fails, pointer to the failing device is
2065 * returned in @r_failed_dev.
2068 * PCI/etc. bus probe sem.
2071 * 0 on success, negative errno otherwise
2073 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2075 struct ata_device
*dev
;
2076 int i
, rc
= 0, used_dma
= 0, found
= 0;
2078 /* has private set_mode? */
2079 if (ap
->ops
->set_mode
) {
2080 /* FIXME: make ->set_mode handle no device case and
2081 * return error code and failing device on failure.
2083 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2084 if (ata_dev_enabled(&ap
->device
[i
])) {
2085 ap
->ops
->set_mode(ap
);
2092 /* step 1: calculate xfer_mask */
2093 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2094 unsigned int pio_mask
, dma_mask
;
2096 dev
= &ap
->device
[i
];
2098 if (!ata_dev_enabled(dev
))
2101 ata_dev_xfermask(dev
);
2103 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2104 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2105 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2106 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2115 /* step 2: always set host PIO timings */
2116 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2117 dev
= &ap
->device
[i
];
2118 if (!ata_dev_enabled(dev
))
2121 if (!dev
->pio_mode
) {
2122 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2127 dev
->xfer_mode
= dev
->pio_mode
;
2128 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2129 if (ap
->ops
->set_piomode
)
2130 ap
->ops
->set_piomode(ap
, dev
);
2133 /* step 3: set host DMA timings */
2134 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2135 dev
= &ap
->device
[i
];
2137 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2140 dev
->xfer_mode
= dev
->dma_mode
;
2141 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2142 if (ap
->ops
->set_dmamode
)
2143 ap
->ops
->set_dmamode(ap
, dev
);
2146 /* step 4: update devices' xfer mode */
2147 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2148 dev
= &ap
->device
[i
];
2150 if (!ata_dev_enabled(dev
))
2153 rc
= ata_dev_set_mode(dev
);
2158 /* Record simplex status. If we selected DMA then the other
2159 * host channels are not permitted to do so.
2161 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2162 ap
->host_set
->simplex_claimed
= 1;
2164 /* step5: chip specific finalisation */
2165 if (ap
->ops
->post_set_mode
)
2166 ap
->ops
->post_set_mode(ap
);
2170 *r_failed_dev
= dev
;
2175 * ata_tf_to_host - issue ATA taskfile to host controller
2176 * @ap: port to which command is being issued
2177 * @tf: ATA taskfile register set
2179 * Issues ATA taskfile register set to ATA host controller,
2180 * with proper synchronization with interrupt handler and
2184 * spin_lock_irqsave(host_set lock)
2187 static inline void ata_tf_to_host(struct ata_port
*ap
,
2188 const struct ata_taskfile
*tf
)
2190 ap
->ops
->tf_load(ap
, tf
);
2191 ap
->ops
->exec_command(ap
, tf
);
2195 * ata_busy_sleep - sleep until BSY clears, or timeout
2196 * @ap: port containing status register to be polled
2197 * @tmout_pat: impatience timeout
2198 * @tmout: overall timeout
2200 * Sleep until ATA Status register bit BSY clears,
2201 * or a timeout occurs.
2206 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2207 unsigned long tmout_pat
, unsigned long tmout
)
2209 unsigned long timer_start
, timeout
;
2212 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2213 timer_start
= jiffies
;
2214 timeout
= timer_start
+ tmout_pat
;
2215 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2217 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2220 if (status
& ATA_BUSY
)
2221 ata_port_printk(ap
, KERN_WARNING
,
2222 "port is slow to respond, please be patient\n");
2224 timeout
= timer_start
+ tmout
;
2225 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2227 status
= ata_chk_status(ap
);
2230 if (status
& ATA_BUSY
) {
2231 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2232 "(%lu secs)\n", tmout
/ HZ
);
2239 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2241 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2242 unsigned int dev0
= devmask
& (1 << 0);
2243 unsigned int dev1
= devmask
& (1 << 1);
2244 unsigned long timeout
;
2246 /* if device 0 was found in ata_devchk, wait for its
2250 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2252 /* if device 1 was found in ata_devchk, wait for
2253 * register access, then wait for BSY to clear
2255 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2259 ap
->ops
->dev_select(ap
, 1);
2260 if (ap
->flags
& ATA_FLAG_MMIO
) {
2261 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2262 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2264 nsect
= inb(ioaddr
->nsect_addr
);
2265 lbal
= inb(ioaddr
->lbal_addr
);
2267 if ((nsect
== 1) && (lbal
== 1))
2269 if (time_after(jiffies
, timeout
)) {
2273 msleep(50); /* give drive a breather */
2276 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2278 /* is all this really necessary? */
2279 ap
->ops
->dev_select(ap
, 0);
2281 ap
->ops
->dev_select(ap
, 1);
2283 ap
->ops
->dev_select(ap
, 0);
2286 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2287 unsigned int devmask
)
2289 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2291 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2293 /* software reset. causes dev0 to be selected */
2294 if (ap
->flags
& ATA_FLAG_MMIO
) {
2295 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2296 udelay(20); /* FIXME: flush */
2297 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2298 udelay(20); /* FIXME: flush */
2299 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2301 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2303 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2305 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2308 /* spec mandates ">= 2ms" before checking status.
2309 * We wait 150ms, because that was the magic delay used for
2310 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2311 * between when the ATA command register is written, and then
2312 * status is checked. Because waiting for "a while" before
2313 * checking status is fine, post SRST, we perform this magic
2314 * delay here as well.
2316 * Old drivers/ide uses the 2mS rule and then waits for ready
2320 /* Before we perform post reset processing we want to see if
2321 * the bus shows 0xFF because the odd clown forgets the D7
2322 * pulldown resistor.
2324 if (ata_check_status(ap
) == 0xFF) {
2325 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2326 return AC_ERR_OTHER
;
2329 ata_bus_post_reset(ap
, devmask
);
2335 * ata_bus_reset - reset host port and associated ATA channel
2336 * @ap: port to reset
2338 * This is typically the first time we actually start issuing
2339 * commands to the ATA channel. We wait for BSY to clear, then
2340 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2341 * result. Determine what devices, if any, are on the channel
2342 * by looking at the device 0/1 error register. Look at the signature
2343 * stored in each device's taskfile registers, to determine if
2344 * the device is ATA or ATAPI.
2347 * PCI/etc. bus probe sem.
2348 * Obtains host_set lock.
2351 * Sets ATA_FLAG_DISABLED if bus reset fails.
2354 void ata_bus_reset(struct ata_port
*ap
)
2356 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2357 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2359 unsigned int dev0
, dev1
= 0, devmask
= 0;
2361 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2363 /* determine if device 0/1 are present */
2364 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2367 dev0
= ata_devchk(ap
, 0);
2369 dev1
= ata_devchk(ap
, 1);
2373 devmask
|= (1 << 0);
2375 devmask
|= (1 << 1);
2377 /* select device 0 again */
2378 ap
->ops
->dev_select(ap
, 0);
2380 /* issue bus reset */
2381 if (ap
->flags
& ATA_FLAG_SRST
)
2382 if (ata_bus_softreset(ap
, devmask
))
2386 * determine by signature whether we have ATA or ATAPI devices
2388 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2389 if ((slave_possible
) && (err
!= 0x81))
2390 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2392 /* re-enable interrupts */
2393 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2396 /* is double-select really necessary? */
2397 if (ap
->device
[1].class != ATA_DEV_NONE
)
2398 ap
->ops
->dev_select(ap
, 1);
2399 if (ap
->device
[0].class != ATA_DEV_NONE
)
2400 ap
->ops
->dev_select(ap
, 0);
2402 /* if no devices were detected, disable this port */
2403 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2404 (ap
->device
[1].class == ATA_DEV_NONE
))
2407 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2408 /* set up device control for ATA_FLAG_SATA_RESET */
2409 if (ap
->flags
& ATA_FLAG_MMIO
)
2410 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2412 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2419 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2420 ap
->ops
->port_disable(ap
);
2426 * sata_phy_debounce - debounce SATA phy status
2427 * @ap: ATA port to debounce SATA phy status for
2428 * @params: timing parameters { interval, duratinon, timeout } in msec
2430 * Make sure SStatus of @ap reaches stable state, determined by
2431 * holding the same value where DET is not 1 for @duration polled
2432 * every @interval, before @timeout. Timeout constraints the
2433 * beginning of the stable state. Because, after hot unplugging,
2434 * DET gets stuck at 1 on some controllers, this functions waits
2435 * until timeout then returns 0 if DET is stable at 1.
2438 * Kernel thread context (may sleep)
2441 * 0 on success, -errno on failure.
2443 int sata_phy_debounce(struct ata_port
*ap
, const unsigned long *params
)
2445 unsigned long interval_msec
= params
[0];
2446 unsigned long duration
= params
[1] * HZ
/ 1000;
2447 unsigned long timeout
= jiffies
+ params
[2] * HZ
/ 1000;
2448 unsigned long last_jiffies
;
2452 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2457 last_jiffies
= jiffies
;
2460 msleep(interval_msec
);
2461 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2467 if (cur
== 1 && time_before(jiffies
, timeout
))
2469 if (time_after(jiffies
, last_jiffies
+ duration
))
2474 /* unstable, start over */
2476 last_jiffies
= jiffies
;
2479 if (time_after(jiffies
, timeout
))
2485 * sata_phy_resume - resume SATA phy
2486 * @ap: ATA port to resume SATA phy for
2487 * @params: timing parameters { interval, duratinon, timeout } in msec
2489 * Resume SATA phy of @ap and debounce it.
2492 * Kernel thread context (may sleep)
2495 * 0 on success, -errno on failure.
2497 int sata_phy_resume(struct ata_port
*ap
, const unsigned long *params
)
2502 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2505 scontrol
= (scontrol
& 0x0f0) | 0x300;
2507 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2510 /* Some PHYs react badly if SStatus is pounded immediately
2511 * after resuming. Delay 200ms before debouncing.
2515 return sata_phy_debounce(ap
, params
);
2518 static void ata_wait_spinup(struct ata_port
*ap
)
2520 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2521 unsigned long end
, secs
;
2524 /* first, debounce phy if SATA */
2525 if (ap
->cbl
== ATA_CBL_SATA
) {
2526 rc
= sata_phy_debounce(ap
, sata_deb_timing_eh
);
2528 /* if debounced successfully and offline, no need to wait */
2529 if ((rc
== 0 || rc
== -EOPNOTSUPP
) && ata_port_offline(ap
))
2533 /* okay, let's give the drive time to spin up */
2534 end
= ehc
->i
.hotplug_timestamp
+ ATA_SPINUP_WAIT
* HZ
/ 1000;
2535 secs
= ((end
- jiffies
) + HZ
- 1) / HZ
;
2537 if (time_after(jiffies
, end
))
2541 ata_port_printk(ap
, KERN_INFO
, "waiting for device to spin up "
2542 "(%lu secs)\n", secs
);
2544 schedule_timeout_uninterruptible(end
- jiffies
);
2548 * ata_std_prereset - prepare for reset
2549 * @ap: ATA port to be reset
2551 * @ap is about to be reset. Initialize it.
2554 * Kernel thread context (may sleep)
2557 * 0 on success, -errno otherwise.
2559 int ata_std_prereset(struct ata_port
*ap
)
2561 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2562 const unsigned long *timing
;
2566 if (ehc
->i
.flags
& ATA_EHI_HOTPLUGGED
) {
2567 if (ap
->flags
& ATA_FLAG_HRST_TO_RESUME
)
2568 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2569 if (ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
)
2570 ata_wait_spinup(ap
);
2573 /* if we're about to do hardreset, nothing more to do */
2574 if (ehc
->i
.action
& ATA_EH_HARDRESET
)
2577 /* if SATA, resume phy */
2578 if (ap
->cbl
== ATA_CBL_SATA
) {
2579 if (ap
->flags
& ATA_FLAG_LOADING
)
2580 timing
= sata_deb_timing_boot
;
2582 timing
= sata_deb_timing_eh
;
2584 rc
= sata_phy_resume(ap
, timing
);
2585 if (rc
&& rc
!= -EOPNOTSUPP
) {
2586 /* phy resume failed */
2587 ata_port_printk(ap
, KERN_WARNING
, "failed to resume "
2588 "link for reset (errno=%d)\n", rc
);
2593 /* Wait for !BSY if the controller can wait for the first D2H
2594 * Reg FIS and we don't know that no device is attached.
2596 if (!(ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
) && !ata_port_offline(ap
))
2597 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2603 * ata_std_softreset - reset host port via ATA SRST
2604 * @ap: port to reset
2605 * @classes: resulting classes of attached devices
2607 * Reset host port using ATA SRST.
2610 * Kernel thread context (may sleep)
2613 * 0 on success, -errno otherwise.
2615 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2617 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2618 unsigned int devmask
= 0, err_mask
;
2623 if (ata_port_offline(ap
)) {
2624 classes
[0] = ATA_DEV_NONE
;
2628 /* determine if device 0/1 are present */
2629 if (ata_devchk(ap
, 0))
2630 devmask
|= (1 << 0);
2631 if (slave_possible
&& ata_devchk(ap
, 1))
2632 devmask
|= (1 << 1);
2634 /* select device 0 again */
2635 ap
->ops
->dev_select(ap
, 0);
2637 /* issue bus reset */
2638 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2639 err_mask
= ata_bus_softreset(ap
, devmask
);
2641 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2646 /* determine by signature whether we have ATA or ATAPI devices */
2647 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2648 if (slave_possible
&& err
!= 0x81)
2649 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2652 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2657 * sata_std_hardreset - reset host port via SATA phy reset
2658 * @ap: port to reset
2659 * @class: resulting class of attached device
2661 * SATA phy-reset host port using DET bits of SControl register.
2664 * Kernel thread context (may sleep)
2667 * 0 on success, -errno otherwise.
2669 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2676 if (sata_set_spd_needed(ap
)) {
2677 /* SATA spec says nothing about how to reconfigure
2678 * spd. To be on the safe side, turn off phy during
2679 * reconfiguration. This works for at least ICH7 AHCI
2682 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2685 scontrol
= (scontrol
& 0x0f0) | 0x302;
2687 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2693 /* issue phy wake/reset */
2694 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2697 scontrol
= (scontrol
& 0x0f0) | 0x301;
2699 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2702 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2703 * 10.4.2 says at least 1 ms.
2707 /* bring phy back */
2708 sata_phy_resume(ap
, sata_deb_timing_eh
);
2710 /* TODO: phy layer with polling, timeouts, etc. */
2711 if (ata_port_offline(ap
)) {
2712 *class = ATA_DEV_NONE
;
2713 DPRINTK("EXIT, link offline\n");
2717 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2718 ata_port_printk(ap
, KERN_ERR
,
2719 "COMRESET failed (device not ready)\n");
2723 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2725 *class = ata_dev_try_classify(ap
, 0, NULL
);
2727 DPRINTK("EXIT, class=%u\n", *class);
2732 * ata_std_postreset - standard postreset callback
2733 * @ap: the target ata_port
2734 * @classes: classes of attached devices
2736 * This function is invoked after a successful reset. Note that
2737 * the device might have been reset more than once using
2738 * different reset methods before postreset is invoked.
2741 * Kernel thread context (may sleep)
2743 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2749 /* print link status */
2750 sata_print_link_status(ap
);
2753 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2754 sata_scr_write(ap
, SCR_ERROR
, serror
);
2756 /* re-enable interrupts */
2757 if (!ap
->ops
->error_handler
) {
2758 /* FIXME: hack. create a hook instead */
2759 if (ap
->ioaddr
.ctl_addr
)
2763 /* is double-select really necessary? */
2764 if (classes
[0] != ATA_DEV_NONE
)
2765 ap
->ops
->dev_select(ap
, 1);
2766 if (classes
[1] != ATA_DEV_NONE
)
2767 ap
->ops
->dev_select(ap
, 0);
2769 /* bail out if no device is present */
2770 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2771 DPRINTK("EXIT, no device\n");
2775 /* set up device control */
2776 if (ap
->ioaddr
.ctl_addr
) {
2777 if (ap
->flags
& ATA_FLAG_MMIO
)
2778 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2780 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2787 * ata_dev_same_device - Determine whether new ID matches configured device
2788 * @dev: device to compare against
2789 * @new_class: class of the new device
2790 * @new_id: IDENTIFY page of the new device
2792 * Compare @new_class and @new_id against @dev and determine
2793 * whether @dev is the device indicated by @new_class and
2800 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2802 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2805 const u16
*old_id
= dev
->id
;
2806 unsigned char model
[2][41], serial
[2][21];
2809 if (dev
->class != new_class
) {
2810 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2811 dev
->class, new_class
);
2815 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2816 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2817 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2818 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2819 new_n_sectors
= ata_id_n_sectors(new_id
);
2821 if (strcmp(model
[0], model
[1])) {
2822 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2823 "'%s' != '%s'\n", model
[0], model
[1]);
2827 if (strcmp(serial
[0], serial
[1])) {
2828 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2829 "'%s' != '%s'\n", serial
[0], serial
[1]);
2833 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2834 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2836 (unsigned long long)dev
->n_sectors
,
2837 (unsigned long long)new_n_sectors
);
2845 * ata_dev_revalidate - Revalidate ATA device
2846 * @dev: device to revalidate
2847 * @post_reset: is this revalidation after reset?
2849 * Re-read IDENTIFY page and make sure @dev is still attached to
2853 * Kernel thread context (may sleep)
2856 * 0 on success, negative errno otherwise
2858 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2860 unsigned int class = dev
->class;
2861 u16
*id
= (void *)dev
->ap
->sector_buf
;
2864 if (!ata_dev_enabled(dev
)) {
2870 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2874 /* is the device still there? */
2875 if (!ata_dev_same_device(dev
, class, id
)) {
2880 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2882 /* configure device according to the new ID */
2883 rc
= ata_dev_configure(dev
, 0);
2888 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
2892 static const char * const ata_dma_blacklist
[] = {
2893 "WDC AC11000H", NULL
,
2894 "WDC AC22100H", NULL
,
2895 "WDC AC32500H", NULL
,
2896 "WDC AC33100H", NULL
,
2897 "WDC AC31600H", NULL
,
2898 "WDC AC32100H", "24.09P07",
2899 "WDC AC23200L", "21.10N21",
2900 "Compaq CRD-8241B", NULL
,
2905 "SanDisk SDP3B", NULL
,
2906 "SanDisk SDP3B-64", NULL
,
2907 "SANYO CD-ROM CRD", NULL
,
2908 "HITACHI CDR-8", NULL
,
2909 "HITACHI CDR-8335", NULL
,
2910 "HITACHI CDR-8435", NULL
,
2911 "Toshiba CD-ROM XM-6202B", NULL
,
2912 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2914 "E-IDE CD-ROM CR-840", NULL
,
2915 "CD-ROM Drive/F5A", NULL
,
2916 "WPI CDD-820", NULL
,
2917 "SAMSUNG CD-ROM SC-148C", NULL
,
2918 "SAMSUNG CD-ROM SC", NULL
,
2919 "SanDisk SDP3B-64", NULL
,
2920 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2921 "_NEC DV5800A", NULL
,
2922 "SAMSUNG CD-ROM SN-124", "N001"
2925 static int ata_strim(char *s
, size_t len
)
2927 len
= strnlen(s
, len
);
2929 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2930 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2937 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2939 unsigned char model_num
[40];
2940 unsigned char model_rev
[16];
2941 unsigned int nlen
, rlen
;
2944 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2946 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2948 nlen
= ata_strim(model_num
, sizeof(model_num
));
2949 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2951 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2952 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2953 if (ata_dma_blacklist
[i
+1] == NULL
)
2955 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2963 * ata_dev_xfermask - Compute supported xfermask of the given device
2964 * @dev: Device to compute xfermask for
2966 * Compute supported xfermask of @dev and store it in
2967 * dev->*_mask. This function is responsible for applying all
2968 * known limits including host controller limits, device
2971 * FIXME: The current implementation limits all transfer modes to
2972 * the fastest of the lowested device on the port. This is not
2973 * required on most controllers.
2978 static void ata_dev_xfermask(struct ata_device
*dev
)
2980 struct ata_port
*ap
= dev
->ap
;
2981 struct ata_host_set
*hs
= ap
->host_set
;
2982 unsigned long xfer_mask
;
2985 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
2986 ap
->mwdma_mask
, ap
->udma_mask
);
2988 /* Apply cable rule here. Don't apply it early because when
2989 * we handle hot plug the cable type can itself change.
2991 if (ap
->cbl
== ATA_CBL_PATA40
)
2992 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2994 /* FIXME: Use port-wide xfermask for now */
2995 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2996 struct ata_device
*d
= &ap
->device
[i
];
2998 if (ata_dev_absent(d
))
3001 if (ata_dev_disabled(d
)) {
3002 /* to avoid violating device selection timing */
3003 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3004 UINT_MAX
, UINT_MAX
);
3008 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3009 d
->mwdma_mask
, d
->udma_mask
);
3010 xfer_mask
&= ata_id_xfermask(d
->id
);
3011 if (ata_dma_blacklisted(d
))
3012 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3015 if (ata_dma_blacklisted(dev
))
3016 ata_dev_printk(dev
, KERN_WARNING
,
3017 "device is on DMA blacklist, disabling DMA\n");
3019 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
3020 if (hs
->simplex_claimed
)
3021 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3024 if (ap
->ops
->mode_filter
)
3025 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
3027 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
3028 &dev
->mwdma_mask
, &dev
->udma_mask
);
3032 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3033 * @dev: Device to which command will be sent
3035 * Issue SET FEATURES - XFER MODE command to device @dev
3039 * PCI/etc. bus probe sem.
3042 * 0 on success, AC_ERR_* mask otherwise.
3045 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3047 struct ata_taskfile tf
;
3048 unsigned int err_mask
;
3050 /* set up set-features taskfile */
3051 DPRINTK("set features - xfer mode\n");
3053 ata_tf_init(dev
, &tf
);
3054 tf
.command
= ATA_CMD_SET_FEATURES
;
3055 tf
.feature
= SETFEATURES_XFER
;
3056 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3057 tf
.protocol
= ATA_PROT_NODATA
;
3058 tf
.nsect
= dev
->xfer_mode
;
3060 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3062 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3067 * ata_dev_init_params - Issue INIT DEV PARAMS command
3068 * @dev: Device to which command will be sent
3069 * @heads: Number of heads (taskfile parameter)
3070 * @sectors: Number of sectors (taskfile parameter)
3073 * Kernel thread context (may sleep)
3076 * 0 on success, AC_ERR_* mask otherwise.
3078 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3079 u16 heads
, u16 sectors
)
3081 struct ata_taskfile tf
;
3082 unsigned int err_mask
;
3084 /* Number of sectors per track 1-255. Number of heads 1-16 */
3085 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3086 return AC_ERR_INVALID
;
3088 /* set up init dev params taskfile */
3089 DPRINTK("init dev params \n");
3091 ata_tf_init(dev
, &tf
);
3092 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3093 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3094 tf
.protocol
= ATA_PROT_NODATA
;
3096 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3098 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3100 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3105 * ata_sg_clean - Unmap DMA memory associated with command
3106 * @qc: Command containing DMA memory to be released
3108 * Unmap all mapped DMA memory associated with this command.
3111 * spin_lock_irqsave(host_set lock)
3114 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3116 struct ata_port
*ap
= qc
->ap
;
3117 struct scatterlist
*sg
= qc
->__sg
;
3118 int dir
= qc
->dma_dir
;
3119 void *pad_buf
= NULL
;
3121 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3122 WARN_ON(sg
== NULL
);
3124 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3125 WARN_ON(qc
->n_elem
> 1);
3127 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3129 /* if we padded the buffer out to 32-bit bound, and data
3130 * xfer direction is from-device, we must copy from the
3131 * pad buffer back into the supplied buffer
3133 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3134 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3136 if (qc
->flags
& ATA_QCFLAG_SG
) {
3138 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3139 /* restore last sg */
3140 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3142 struct scatterlist
*psg
= &qc
->pad_sgent
;
3143 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3144 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3145 kunmap_atomic(addr
, KM_IRQ0
);
3149 dma_unmap_single(ap
->dev
,
3150 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3153 sg
->length
+= qc
->pad_len
;
3155 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3156 pad_buf
, qc
->pad_len
);
3159 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3164 * ata_fill_sg - Fill PCI IDE PRD table
3165 * @qc: Metadata associated with taskfile to be transferred
3167 * Fill PCI IDE PRD (scatter-gather) table with segments
3168 * associated with the current disk command.
3171 * spin_lock_irqsave(host_set lock)
3174 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3176 struct ata_port
*ap
= qc
->ap
;
3177 struct scatterlist
*sg
;
3180 WARN_ON(qc
->__sg
== NULL
);
3181 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3184 ata_for_each_sg(sg
, qc
) {
3188 /* determine if physical DMA addr spans 64K boundary.
3189 * Note h/w doesn't support 64-bit, so we unconditionally
3190 * truncate dma_addr_t to u32.
3192 addr
= (u32
) sg_dma_address(sg
);
3193 sg_len
= sg_dma_len(sg
);
3196 offset
= addr
& 0xffff;
3198 if ((offset
+ sg_len
) > 0x10000)
3199 len
= 0x10000 - offset
;
3201 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3202 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3203 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3212 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3215 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3216 * @qc: Metadata associated with taskfile to check
3218 * Allow low-level driver to filter ATA PACKET commands, returning
3219 * a status indicating whether or not it is OK to use DMA for the
3220 * supplied PACKET command.
3223 * spin_lock_irqsave(host_set lock)
3225 * RETURNS: 0 when ATAPI DMA can be used
3228 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3230 struct ata_port
*ap
= qc
->ap
;
3231 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3233 if (ap
->ops
->check_atapi_dma
)
3234 rc
= ap
->ops
->check_atapi_dma(qc
);
3236 /* We don't support polling DMA.
3237 * Use PIO if the LLDD handles only interrupts in
3238 * the HSM_ST_LAST state and the ATAPI device
3239 * generates CDB interrupts.
3241 if ((ap
->flags
& ATA_FLAG_PIO_POLLING
) &&
3242 (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3248 * ata_qc_prep - Prepare taskfile for submission
3249 * @qc: Metadata associated with taskfile to be prepared
3251 * Prepare ATA taskfile for submission.
3254 * spin_lock_irqsave(host_set lock)
3256 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3258 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3264 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3267 * ata_sg_init_one - Associate command with memory buffer
3268 * @qc: Command to be associated
3269 * @buf: Memory buffer
3270 * @buflen: Length of memory buffer, in bytes.
3272 * Initialize the data-related elements of queued_cmd @qc
3273 * to point to a single memory buffer, @buf of byte length @buflen.
3276 * spin_lock_irqsave(host_set lock)
3279 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3281 struct scatterlist
*sg
;
3283 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3285 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3286 qc
->__sg
= &qc
->sgent
;
3288 qc
->orig_n_elem
= 1;
3290 qc
->nbytes
= buflen
;
3293 sg_init_one(sg
, buf
, buflen
);
3297 * ata_sg_init - Associate command with scatter-gather table.
3298 * @qc: Command to be associated
3299 * @sg: Scatter-gather table.
3300 * @n_elem: Number of elements in s/g table.
3302 * Initialize the data-related elements of queued_cmd @qc
3303 * to point to a scatter-gather table @sg, containing @n_elem
3307 * spin_lock_irqsave(host_set lock)
3310 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3311 unsigned int n_elem
)
3313 qc
->flags
|= ATA_QCFLAG_SG
;
3315 qc
->n_elem
= n_elem
;
3316 qc
->orig_n_elem
= n_elem
;
3320 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3321 * @qc: Command with memory buffer to be mapped.
3323 * DMA-map the memory buffer associated with queued_cmd @qc.
3326 * spin_lock_irqsave(host_set lock)
3329 * Zero on success, negative on error.
3332 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3334 struct ata_port
*ap
= qc
->ap
;
3335 int dir
= qc
->dma_dir
;
3336 struct scatterlist
*sg
= qc
->__sg
;
3337 dma_addr_t dma_address
;
3340 /* we must lengthen transfers to end on a 32-bit boundary */
3341 qc
->pad_len
= sg
->length
& 3;
3343 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3344 struct scatterlist
*psg
= &qc
->pad_sgent
;
3346 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3348 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3350 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3351 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3354 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3355 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3357 sg
->length
-= qc
->pad_len
;
3358 if (sg
->length
== 0)
3361 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3362 sg
->length
, qc
->pad_len
);
3370 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3372 if (dma_mapping_error(dma_address
)) {
3374 sg
->length
+= qc
->pad_len
;
3378 sg_dma_address(sg
) = dma_address
;
3379 sg_dma_len(sg
) = sg
->length
;
3382 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3383 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3389 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3390 * @qc: Command with scatter-gather table to be mapped.
3392 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3395 * spin_lock_irqsave(host_set lock)
3398 * Zero on success, negative on error.
3402 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3404 struct ata_port
*ap
= qc
->ap
;
3405 struct scatterlist
*sg
= qc
->__sg
;
3406 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3407 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3409 VPRINTK("ENTER, ata%u\n", ap
->id
);
3410 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3412 /* we must lengthen transfers to end on a 32-bit boundary */
3413 qc
->pad_len
= lsg
->length
& 3;
3415 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3416 struct scatterlist
*psg
= &qc
->pad_sgent
;
3417 unsigned int offset
;
3419 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3421 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3424 * psg->page/offset are used to copy to-be-written
3425 * data in this function or read data in ata_sg_clean.
3427 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3428 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3429 psg
->offset
= offset_in_page(offset
);
3431 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3432 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3433 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3434 kunmap_atomic(addr
, KM_IRQ0
);
3437 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3438 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3440 lsg
->length
-= qc
->pad_len
;
3441 if (lsg
->length
== 0)
3444 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3445 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3448 pre_n_elem
= qc
->n_elem
;
3449 if (trim_sg
&& pre_n_elem
)
3458 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3460 /* restore last sg */
3461 lsg
->length
+= qc
->pad_len
;
3465 DPRINTK("%d sg elements mapped\n", n_elem
);
3468 qc
->n_elem
= n_elem
;
3474 * swap_buf_le16 - swap halves of 16-bit words in place
3475 * @buf: Buffer to swap
3476 * @buf_words: Number of 16-bit words in buffer.
3478 * Swap halves of 16-bit words if needed to convert from
3479 * little-endian byte order to native cpu byte order, or
3483 * Inherited from caller.
3485 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3490 for (i
= 0; i
< buf_words
; i
++)
3491 buf
[i
] = le16_to_cpu(buf
[i
]);
3492 #endif /* __BIG_ENDIAN */
3496 * ata_mmio_data_xfer - Transfer data by MMIO
3497 * @dev: device for this I/O
3499 * @buflen: buffer length
3500 * @write_data: read/write
3502 * Transfer data from/to the device data register by MMIO.
3505 * Inherited from caller.
3508 void ata_mmio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3509 unsigned int buflen
, int write_data
)
3511 struct ata_port
*ap
= adev
->ap
;
3513 unsigned int words
= buflen
>> 1;
3514 u16
*buf16
= (u16
*) buf
;
3515 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3517 /* Transfer multiple of 2 bytes */
3519 for (i
= 0; i
< words
; i
++)
3520 writew(le16_to_cpu(buf16
[i
]), mmio
);
3522 for (i
= 0; i
< words
; i
++)
3523 buf16
[i
] = cpu_to_le16(readw(mmio
));
3526 /* Transfer trailing 1 byte, if any. */
3527 if (unlikely(buflen
& 0x01)) {
3528 u16 align_buf
[1] = { 0 };
3529 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3532 memcpy(align_buf
, trailing_buf
, 1);
3533 writew(le16_to_cpu(align_buf
[0]), mmio
);
3535 align_buf
[0] = cpu_to_le16(readw(mmio
));
3536 memcpy(trailing_buf
, align_buf
, 1);
3542 * ata_pio_data_xfer - Transfer data by PIO
3543 * @adev: device to target
3545 * @buflen: buffer length
3546 * @write_data: read/write
3548 * Transfer data from/to the device data register by PIO.
3551 * Inherited from caller.
3554 void ata_pio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3555 unsigned int buflen
, int write_data
)
3557 struct ata_port
*ap
= adev
->ap
;
3558 unsigned int words
= buflen
>> 1;
3560 /* Transfer multiple of 2 bytes */
3562 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3564 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3566 /* Transfer trailing 1 byte, if any. */
3567 if (unlikely(buflen
& 0x01)) {
3568 u16 align_buf
[1] = { 0 };
3569 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3572 memcpy(align_buf
, trailing_buf
, 1);
3573 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3575 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3576 memcpy(trailing_buf
, align_buf
, 1);
3582 * ata_pio_data_xfer_noirq - Transfer data by PIO
3583 * @adev: device to target
3585 * @buflen: buffer length
3586 * @write_data: read/write
3588 * Transfer data from/to the device data register by PIO. Do the
3589 * transfer with interrupts disabled.
3592 * Inherited from caller.
3595 void ata_pio_data_xfer_noirq(struct ata_device
*adev
, unsigned char *buf
,
3596 unsigned int buflen
, int write_data
)
3598 unsigned long flags
;
3599 local_irq_save(flags
);
3600 ata_pio_data_xfer(adev
, buf
, buflen
, write_data
);
3601 local_irq_restore(flags
);
3606 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3607 * @qc: Command on going
3609 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3612 * Inherited from caller.
3615 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3617 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3618 struct scatterlist
*sg
= qc
->__sg
;
3619 struct ata_port
*ap
= qc
->ap
;
3621 unsigned int offset
;
3624 if (qc
->cursect
== (qc
->nsect
- 1))
3625 ap
->hsm_task_state
= HSM_ST_LAST
;
3627 page
= sg
[qc
->cursg
].page
;
3628 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3630 /* get the current page and offset */
3631 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3632 offset
%= PAGE_SIZE
;
3634 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3636 if (PageHighMem(page
)) {
3637 unsigned long flags
;
3639 /* FIXME: use a bounce buffer */
3640 local_irq_save(flags
);
3641 buf
= kmap_atomic(page
, KM_IRQ0
);
3643 /* do the actual data transfer */
3644 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3646 kunmap_atomic(buf
, KM_IRQ0
);
3647 local_irq_restore(flags
);
3649 buf
= page_address(page
);
3650 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3656 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3663 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3664 * @qc: Command on going
3666 * Transfer one or many ATA_SECT_SIZE of data from/to the
3667 * ATA device for the DRQ request.
3670 * Inherited from caller.
3673 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3675 if (is_multi_taskfile(&qc
->tf
)) {
3676 /* READ/WRITE MULTIPLE */
3679 WARN_ON(qc
->dev
->multi_count
== 0);
3681 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3689 * atapi_send_cdb - Write CDB bytes to hardware
3690 * @ap: Port to which ATAPI device is attached.
3691 * @qc: Taskfile currently active
3693 * When device has indicated its readiness to accept
3694 * a CDB, this function is called. Send the CDB.
3700 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3703 DPRINTK("send cdb\n");
3704 WARN_ON(qc
->dev
->cdb_len
< 12);
3706 ap
->ops
->data_xfer(qc
->dev
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3707 ata_altstatus(ap
); /* flush */
3709 switch (qc
->tf
.protocol
) {
3710 case ATA_PROT_ATAPI
:
3711 ap
->hsm_task_state
= HSM_ST
;
3713 case ATA_PROT_ATAPI_NODATA
:
3714 ap
->hsm_task_state
= HSM_ST_LAST
;
3716 case ATA_PROT_ATAPI_DMA
:
3717 ap
->hsm_task_state
= HSM_ST_LAST
;
3718 /* initiate bmdma */
3719 ap
->ops
->bmdma_start(qc
);
3725 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3726 * @qc: Command on going
3727 * @bytes: number of bytes
3729 * Transfer Transfer data from/to the ATAPI device.
3732 * Inherited from caller.
3736 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3738 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3739 struct scatterlist
*sg
= qc
->__sg
;
3740 struct ata_port
*ap
= qc
->ap
;
3743 unsigned int offset
, count
;
3745 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3746 ap
->hsm_task_state
= HSM_ST_LAST
;
3749 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3751 * The end of qc->sg is reached and the device expects
3752 * more data to transfer. In order not to overrun qc->sg
3753 * and fulfill length specified in the byte count register,
3754 * - for read case, discard trailing data from the device
3755 * - for write case, padding zero data to the device
3757 u16 pad_buf
[1] = { 0 };
3758 unsigned int words
= bytes
>> 1;
3761 if (words
) /* warning if bytes > 1 */
3762 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3763 "%u bytes trailing data\n", bytes
);
3765 for (i
= 0; i
< words
; i
++)
3766 ap
->ops
->data_xfer(qc
->dev
, (unsigned char*)pad_buf
, 2, do_write
);
3768 ap
->hsm_task_state
= HSM_ST_LAST
;
3772 sg
= &qc
->__sg
[qc
->cursg
];
3775 offset
= sg
->offset
+ qc
->cursg_ofs
;
3777 /* get the current page and offset */
3778 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3779 offset
%= PAGE_SIZE
;
3781 /* don't overrun current sg */
3782 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3784 /* don't cross page boundaries */
3785 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3787 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3789 if (PageHighMem(page
)) {
3790 unsigned long flags
;
3792 /* FIXME: use bounce buffer */
3793 local_irq_save(flags
);
3794 buf
= kmap_atomic(page
, KM_IRQ0
);
3796 /* do the actual data transfer */
3797 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3799 kunmap_atomic(buf
, KM_IRQ0
);
3800 local_irq_restore(flags
);
3802 buf
= page_address(page
);
3803 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3807 qc
->curbytes
+= count
;
3808 qc
->cursg_ofs
+= count
;
3810 if (qc
->cursg_ofs
== sg
->length
) {
3820 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3821 * @qc: Command on going
3823 * Transfer Transfer data from/to the ATAPI device.
3826 * Inherited from caller.
3829 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3831 struct ata_port
*ap
= qc
->ap
;
3832 struct ata_device
*dev
= qc
->dev
;
3833 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3834 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3836 /* Abuse qc->result_tf for temp storage of intermediate TF
3837 * here to save some kernel stack usage.
3838 * For normal completion, qc->result_tf is not relevant. For
3839 * error, qc->result_tf is later overwritten by ata_qc_complete().
3840 * So, the correctness of qc->result_tf is not affected.
3842 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
3843 ireason
= qc
->result_tf
.nsect
;
3844 bc_lo
= qc
->result_tf
.lbam
;
3845 bc_hi
= qc
->result_tf
.lbah
;
3846 bytes
= (bc_hi
<< 8) | bc_lo
;
3848 /* shall be cleared to zero, indicating xfer of data */
3849 if (ireason
& (1 << 0))
3852 /* make sure transfer direction matches expected */
3853 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3854 if (do_write
!= i_write
)
3857 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3859 __atapi_pio_bytes(qc
, bytes
);
3864 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
3865 qc
->err_mask
|= AC_ERR_HSM
;
3866 ap
->hsm_task_state
= HSM_ST_ERR
;
3870 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3871 * @ap: the target ata_port
3875 * 1 if ok in workqueue, 0 otherwise.
3878 static inline int ata_hsm_ok_in_wq(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3880 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3883 if (ap
->hsm_task_state
== HSM_ST_FIRST
) {
3884 if (qc
->tf
.protocol
== ATA_PROT_PIO
&&
3885 (qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3888 if (is_atapi_taskfile(&qc
->tf
) &&
3889 !(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3897 * ata_hsm_qc_complete - finish a qc running on standard HSM
3898 * @qc: Command to complete
3899 * @in_wq: 1 if called from workqueue, 0 otherwise
3901 * Finish @qc which is running on standard HSM.
3904 * If @in_wq is zero, spin_lock_irqsave(host_set lock).
3905 * Otherwise, none on entry and grabs host lock.
3907 static void ata_hsm_qc_complete(struct ata_queued_cmd
*qc
, int in_wq
)
3909 struct ata_port
*ap
= qc
->ap
;
3910 unsigned long flags
;
3912 if (ap
->ops
->error_handler
) {
3914 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3916 /* EH might have kicked in while host_set lock
3919 qc
= ata_qc_from_tag(ap
, qc
->tag
);
3921 if (likely(!(qc
->err_mask
& AC_ERR_HSM
))) {
3923 ata_qc_complete(qc
);
3925 ata_port_freeze(ap
);
3928 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3930 if (likely(!(qc
->err_mask
& AC_ERR_HSM
)))
3931 ata_qc_complete(qc
);
3933 ata_port_freeze(ap
);
3937 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3939 ata_qc_complete(qc
);
3940 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3942 ata_qc_complete(qc
);
3945 ata_altstatus(ap
); /* flush */
3949 * ata_hsm_move - move the HSM to the next state.
3950 * @ap: the target ata_port
3952 * @status: current device status
3953 * @in_wq: 1 if called from workqueue, 0 otherwise
3956 * 1 when poll next status needed, 0 otherwise.
3958 int ata_hsm_move(struct ata_port
*ap
, struct ata_queued_cmd
*qc
,
3959 u8 status
, int in_wq
)
3961 unsigned long flags
= 0;
3964 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
3966 /* Make sure ata_qc_issue_prot() does not throw things
3967 * like DMA polling into the workqueue. Notice that
3968 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
3970 WARN_ON(in_wq
!= ata_hsm_ok_in_wq(ap
, qc
));
3973 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
3974 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
3976 switch (ap
->hsm_task_state
) {
3978 /* Send first data block or PACKET CDB */
3980 /* If polling, we will stay in the work queue after
3981 * sending the data. Otherwise, interrupt handler
3982 * takes over after sending the data.
3984 poll_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
3986 /* check device status */
3987 if (unlikely((status
& ATA_DRQ
) == 0)) {
3988 /* handle BSY=0, DRQ=0 as error */
3989 if (likely(status
& (ATA_ERR
| ATA_DF
)))
3990 /* device stops HSM for abort/error */
3991 qc
->err_mask
|= AC_ERR_DEV
;
3993 /* HSM violation. Let EH handle this */
3994 qc
->err_mask
|= AC_ERR_HSM
;
3996 ap
->hsm_task_state
= HSM_ST_ERR
;
4000 /* Device should not ask for data transfer (DRQ=1)
4001 * when it finds something wrong.
4002 * We ignore DRQ here and stop the HSM by
4003 * changing hsm_task_state to HSM_ST_ERR and
4004 * let the EH abort the command or reset the device.
4006 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4007 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4009 qc
->err_mask
|= AC_ERR_HSM
;
4010 ap
->hsm_task_state
= HSM_ST_ERR
;
4014 /* Send the CDB (atapi) or the first data block (ata pio out).
4015 * During the state transition, interrupt handler shouldn't
4016 * be invoked before the data transfer is complete and
4017 * hsm_task_state is changed. Hence, the following locking.
4020 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4022 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
4023 /* PIO data out protocol.
4024 * send first data block.
4027 /* ata_pio_sectors() might change the state
4028 * to HSM_ST_LAST. so, the state is changed here
4029 * before ata_pio_sectors().
4031 ap
->hsm_task_state
= HSM_ST
;
4032 ata_pio_sectors(qc
);
4033 ata_altstatus(ap
); /* flush */
4036 atapi_send_cdb(ap
, qc
);
4039 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4041 /* if polling, ata_pio_task() handles the rest.
4042 * otherwise, interrupt handler takes over from here.
4047 /* complete command or read/write the data register */
4048 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4049 /* ATAPI PIO protocol */
4050 if ((status
& ATA_DRQ
) == 0) {
4051 /* No more data to transfer or device error.
4052 * Device error will be tagged in HSM_ST_LAST.
4054 ap
->hsm_task_state
= HSM_ST_LAST
;
4058 /* Device should not ask for data transfer (DRQ=1)
4059 * when it finds something wrong.
4060 * We ignore DRQ here and stop the HSM by
4061 * changing hsm_task_state to HSM_ST_ERR and
4062 * let the EH abort the command or reset the device.
4064 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4065 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4067 qc
->err_mask
|= AC_ERR_HSM
;
4068 ap
->hsm_task_state
= HSM_ST_ERR
;
4072 atapi_pio_bytes(qc
);
4074 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4075 /* bad ireason reported by device */
4079 /* ATA PIO protocol */
4080 if (unlikely((status
& ATA_DRQ
) == 0)) {
4081 /* handle BSY=0, DRQ=0 as error */
4082 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4083 /* device stops HSM for abort/error */
4084 qc
->err_mask
|= AC_ERR_DEV
;
4086 /* HSM violation. Let EH handle this */
4087 qc
->err_mask
|= AC_ERR_HSM
;
4089 ap
->hsm_task_state
= HSM_ST_ERR
;
4093 /* For PIO reads, some devices may ask for
4094 * data transfer (DRQ=1) alone with ERR=1.
4095 * We respect DRQ here and transfer one
4096 * block of junk data before changing the
4097 * hsm_task_state to HSM_ST_ERR.
4099 * For PIO writes, ERR=1 DRQ=1 doesn't make
4100 * sense since the data block has been
4101 * transferred to the device.
4103 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4104 /* data might be corrputed */
4105 qc
->err_mask
|= AC_ERR_DEV
;
4107 if (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
)) {
4108 ata_pio_sectors(qc
);
4110 status
= ata_wait_idle(ap
);
4113 if (status
& (ATA_BUSY
| ATA_DRQ
))
4114 qc
->err_mask
|= AC_ERR_HSM
;
4116 /* ata_pio_sectors() might change the
4117 * state to HSM_ST_LAST. so, the state
4118 * is changed after ata_pio_sectors().
4120 ap
->hsm_task_state
= HSM_ST_ERR
;
4124 ata_pio_sectors(qc
);
4126 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4127 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4130 status
= ata_wait_idle(ap
);
4135 ata_altstatus(ap
); /* flush */
4140 if (unlikely(!ata_ok(status
))) {
4141 qc
->err_mask
|= __ac_err_mask(status
);
4142 ap
->hsm_task_state
= HSM_ST_ERR
;
4146 /* no more data to transfer */
4147 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4148 ap
->id
, qc
->dev
->devno
, status
);
4150 WARN_ON(qc
->err_mask
);
4152 ap
->hsm_task_state
= HSM_ST_IDLE
;
4154 /* complete taskfile transaction */
4155 ata_hsm_qc_complete(qc
, in_wq
);
4161 /* make sure qc->err_mask is available to
4162 * know what's wrong and recover
4164 WARN_ON(qc
->err_mask
== 0);
4166 ap
->hsm_task_state
= HSM_ST_IDLE
;
4168 /* complete taskfile transaction */
4169 ata_hsm_qc_complete(qc
, in_wq
);
4181 static void ata_pio_task(void *_data
)
4183 struct ata_queued_cmd
*qc
= _data
;
4184 struct ata_port
*ap
= qc
->ap
;
4189 WARN_ON(ap
->hsm_task_state
== HSM_ST_IDLE
);
4192 * This is purely heuristic. This is a fast path.
4193 * Sometimes when we enter, BSY will be cleared in
4194 * a chk-status or two. If not, the drive is probably seeking
4195 * or something. Snooze for a couple msecs, then
4196 * chk-status again. If still busy, queue delayed work.
4198 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
4199 if (status
& ATA_BUSY
) {
4201 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
4202 if (status
& ATA_BUSY
) {
4203 ata_port_queue_task(ap
, ata_pio_task
, qc
, ATA_SHORT_PAUSE
);
4209 poll_next
= ata_hsm_move(ap
, qc
, status
, 1);
4211 /* another command or interrupt handler
4212 * may be running at this point.
4219 * ata_qc_new - Request an available ATA command, for queueing
4220 * @ap: Port associated with device @dev
4221 * @dev: Device from whom we request an available command structure
4227 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4229 struct ata_queued_cmd
*qc
= NULL
;
4232 /* no command while frozen */
4233 if (unlikely(ap
->flags
& ATA_FLAG_FROZEN
))
4236 /* the last tag is reserved for internal command. */
4237 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4238 if (!test_and_set_bit(i
, &ap
->qc_allocated
)) {
4239 qc
= __ata_qc_from_tag(ap
, i
);
4250 * ata_qc_new_init - Request an available ATA command, and initialize it
4251 * @dev: Device from whom we request an available command structure
4257 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4259 struct ata_port
*ap
= dev
->ap
;
4260 struct ata_queued_cmd
*qc
;
4262 qc
= ata_qc_new(ap
);
4275 * ata_qc_free - free unused ata_queued_cmd
4276 * @qc: Command to complete
4278 * Designed to free unused ata_queued_cmd object
4279 * in case something prevents using it.
4282 * spin_lock_irqsave(host_set lock)
4284 void ata_qc_free(struct ata_queued_cmd
*qc
)
4286 struct ata_port
*ap
= qc
->ap
;
4289 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4293 if (likely(ata_tag_valid(tag
))) {
4294 qc
->tag
= ATA_TAG_POISON
;
4295 clear_bit(tag
, &ap
->qc_allocated
);
4299 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4301 struct ata_port
*ap
= qc
->ap
;
4303 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4304 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4306 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4309 /* command should be marked inactive atomically with qc completion */
4310 if (qc
->tf
.protocol
== ATA_PROT_NCQ
)
4311 ap
->sactive
&= ~(1 << qc
->tag
);
4313 ap
->active_tag
= ATA_TAG_POISON
;
4315 /* atapi: mark qc as inactive to prevent the interrupt handler
4316 * from completing the command twice later, before the error handler
4317 * is called. (when rc != 0 and atapi request sense is needed)
4319 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4320 ap
->qc_active
&= ~(1 << qc
->tag
);
4322 /* call completion callback */
4323 qc
->complete_fn(qc
);
4327 * ata_qc_complete - Complete an active ATA command
4328 * @qc: Command to complete
4329 * @err_mask: ATA Status register contents
4331 * Indicate to the mid and upper layers that an ATA
4332 * command has completed, with either an ok or not-ok status.
4335 * spin_lock_irqsave(host_set lock)
4337 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4339 struct ata_port
*ap
= qc
->ap
;
4341 /* XXX: New EH and old EH use different mechanisms to
4342 * synchronize EH with regular execution path.
4344 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4345 * Normal execution path is responsible for not accessing a
4346 * failed qc. libata core enforces the rule by returning NULL
4347 * from ata_qc_from_tag() for failed qcs.
4349 * Old EH depends on ata_qc_complete() nullifying completion
4350 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4351 * not synchronize with interrupt handler. Only PIO task is
4354 if (ap
->ops
->error_handler
) {
4355 WARN_ON(ap
->flags
& ATA_FLAG_FROZEN
);
4357 if (unlikely(qc
->err_mask
))
4358 qc
->flags
|= ATA_QCFLAG_FAILED
;
4360 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4361 if (!ata_tag_internal(qc
->tag
)) {
4362 /* always fill result TF for failed qc */
4363 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4364 ata_qc_schedule_eh(qc
);
4369 /* read result TF if requested */
4370 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4371 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4373 __ata_qc_complete(qc
);
4375 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4378 /* read result TF if failed or requested */
4379 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4380 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4382 __ata_qc_complete(qc
);
4387 * ata_qc_complete_multiple - Complete multiple qcs successfully
4388 * @ap: port in question
4389 * @qc_active: new qc_active mask
4390 * @finish_qc: LLDD callback invoked before completing a qc
4392 * Complete in-flight commands. This functions is meant to be
4393 * called from low-level driver's interrupt routine to complete
4394 * requests normally. ap->qc_active and @qc_active is compared
4395 * and commands are completed accordingly.
4398 * spin_lock_irqsave(host_set lock)
4401 * Number of completed commands on success, -errno otherwise.
4403 int ata_qc_complete_multiple(struct ata_port
*ap
, u32 qc_active
,
4404 void (*finish_qc
)(struct ata_queued_cmd
*))
4410 done_mask
= ap
->qc_active
^ qc_active
;
4412 if (unlikely(done_mask
& qc_active
)) {
4413 ata_port_printk(ap
, KERN_ERR
, "illegal qc_active transition "
4414 "(%08x->%08x)\n", ap
->qc_active
, qc_active
);
4418 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
4419 struct ata_queued_cmd
*qc
;
4421 if (!(done_mask
& (1 << i
)))
4424 if ((qc
= ata_qc_from_tag(ap
, i
))) {
4427 ata_qc_complete(qc
);
4435 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4437 struct ata_port
*ap
= qc
->ap
;
4439 switch (qc
->tf
.protocol
) {
4442 case ATA_PROT_ATAPI_DMA
:
4445 case ATA_PROT_ATAPI
:
4447 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4460 * ata_qc_issue - issue taskfile to device
4461 * @qc: command to issue to device
4463 * Prepare an ATA command to submission to device.
4464 * This includes mapping the data into a DMA-able
4465 * area, filling in the S/G table, and finally
4466 * writing the taskfile to hardware, starting the command.
4469 * spin_lock_irqsave(host_set lock)
4471 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4473 struct ata_port
*ap
= qc
->ap
;
4475 /* Make sure only one non-NCQ command is outstanding. The
4476 * check is skipped for old EH because it reuses active qc to
4477 * request ATAPI sense.
4479 WARN_ON(ap
->ops
->error_handler
&& ata_tag_valid(ap
->active_tag
));
4481 if (qc
->tf
.protocol
== ATA_PROT_NCQ
) {
4482 WARN_ON(ap
->sactive
& (1 << qc
->tag
));
4483 ap
->sactive
|= 1 << qc
->tag
;
4485 WARN_ON(ap
->sactive
);
4486 ap
->active_tag
= qc
->tag
;
4489 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4490 ap
->qc_active
|= 1 << qc
->tag
;
4492 if (ata_should_dma_map(qc
)) {
4493 if (qc
->flags
& ATA_QCFLAG_SG
) {
4494 if (ata_sg_setup(qc
))
4496 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4497 if (ata_sg_setup_one(qc
))
4501 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4504 ap
->ops
->qc_prep(qc
);
4506 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4507 if (unlikely(qc
->err_mask
))
4512 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4513 qc
->err_mask
|= AC_ERR_SYSTEM
;
4515 ata_qc_complete(qc
);
4519 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4520 * @qc: command to issue to device
4522 * Using various libata functions and hooks, this function
4523 * starts an ATA command. ATA commands are grouped into
4524 * classes called "protocols", and issuing each type of protocol
4525 * is slightly different.
4527 * May be used as the qc_issue() entry in ata_port_operations.
4530 * spin_lock_irqsave(host_set lock)
4533 * Zero on success, AC_ERR_* mask on failure
4536 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4538 struct ata_port
*ap
= qc
->ap
;
4540 /* Use polling pio if the LLD doesn't handle
4541 * interrupt driven pio and atapi CDB interrupt.
4543 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4544 switch (qc
->tf
.protocol
) {
4546 case ATA_PROT_ATAPI
:
4547 case ATA_PROT_ATAPI_NODATA
:
4548 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4550 case ATA_PROT_ATAPI_DMA
:
4551 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4552 /* see ata_check_atapi_dma() */
4560 /* select the device */
4561 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4563 /* start the command */
4564 switch (qc
->tf
.protocol
) {
4565 case ATA_PROT_NODATA
:
4566 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4567 ata_qc_set_polling(qc
);
4569 ata_tf_to_host(ap
, &qc
->tf
);
4570 ap
->hsm_task_state
= HSM_ST_LAST
;
4572 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4573 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4578 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4580 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4581 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4582 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4583 ap
->hsm_task_state
= HSM_ST_LAST
;
4587 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4588 ata_qc_set_polling(qc
);
4590 ata_tf_to_host(ap
, &qc
->tf
);
4592 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4593 /* PIO data out protocol */
4594 ap
->hsm_task_state
= HSM_ST_FIRST
;
4595 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4597 /* always send first data block using
4598 * the ata_pio_task() codepath.
4601 /* PIO data in protocol */
4602 ap
->hsm_task_state
= HSM_ST
;
4604 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4605 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4607 /* if polling, ata_pio_task() handles the rest.
4608 * otherwise, interrupt handler takes over from here.
4614 case ATA_PROT_ATAPI
:
4615 case ATA_PROT_ATAPI_NODATA
:
4616 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4617 ata_qc_set_polling(qc
);
4619 ata_tf_to_host(ap
, &qc
->tf
);
4621 ap
->hsm_task_state
= HSM_ST_FIRST
;
4623 /* send cdb by polling if no cdb interrupt */
4624 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4625 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4626 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4629 case ATA_PROT_ATAPI_DMA
:
4630 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4632 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4633 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4634 ap
->hsm_task_state
= HSM_ST_FIRST
;
4636 /* send cdb by polling if no cdb interrupt */
4637 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4638 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4643 return AC_ERR_SYSTEM
;
4650 * ata_host_intr - Handle host interrupt for given (port, task)
4651 * @ap: Port on which interrupt arrived (possibly...)
4652 * @qc: Taskfile currently active in engine
4654 * Handle host interrupt for given queued command. Currently,
4655 * only DMA interrupts are handled. All other commands are
4656 * handled via polling with interrupts disabled (nIEN bit).
4659 * spin_lock_irqsave(host_set lock)
4662 * One if interrupt was handled, zero if not (shared irq).
4665 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4666 struct ata_queued_cmd
*qc
)
4668 u8 status
, host_stat
= 0;
4670 VPRINTK("ata%u: protocol %d task_state %d\n",
4671 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4673 /* Check whether we are expecting interrupt in this state */
4674 switch (ap
->hsm_task_state
) {
4676 /* Some pre-ATAPI-4 devices assert INTRQ
4677 * at this state when ready to receive CDB.
4680 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4681 * The flag was turned on only for atapi devices.
4682 * No need to check is_atapi_taskfile(&qc->tf) again.
4684 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4688 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4689 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4690 /* check status of DMA engine */
4691 host_stat
= ap
->ops
->bmdma_status(ap
);
4692 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4694 /* if it's not our irq... */
4695 if (!(host_stat
& ATA_DMA_INTR
))
4698 /* before we do anything else, clear DMA-Start bit */
4699 ap
->ops
->bmdma_stop(qc
);
4701 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4702 /* error when transfering data to/from memory */
4703 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4704 ap
->hsm_task_state
= HSM_ST_ERR
;
4714 /* check altstatus */
4715 status
= ata_altstatus(ap
);
4716 if (status
& ATA_BUSY
)
4719 /* check main status, clearing INTRQ */
4720 status
= ata_chk_status(ap
);
4721 if (unlikely(status
& ATA_BUSY
))
4724 /* ack bmdma irq events */
4725 ap
->ops
->irq_clear(ap
);
4727 ata_hsm_move(ap
, qc
, status
, 0);
4728 return 1; /* irq handled */
4731 ap
->stats
.idle_irq
++;
4734 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4735 ata_irq_ack(ap
, 0); /* debug trap */
4736 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4740 return 0; /* irq not handled */
4744 * ata_interrupt - Default ATA host interrupt handler
4745 * @irq: irq line (unused)
4746 * @dev_instance: pointer to our ata_host_set information structure
4749 * Default interrupt handler for PCI IDE devices. Calls
4750 * ata_host_intr() for each port that is not disabled.
4753 * Obtains host_set lock during operation.
4756 * IRQ_NONE or IRQ_HANDLED.
4759 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4761 struct ata_host_set
*host_set
= dev_instance
;
4763 unsigned int handled
= 0;
4764 unsigned long flags
;
4766 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4767 spin_lock_irqsave(&host_set
->lock
, flags
);
4769 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4770 struct ata_port
*ap
;
4772 ap
= host_set
->ports
[i
];
4774 !(ap
->flags
& ATA_FLAG_DISABLED
)) {
4775 struct ata_queued_cmd
*qc
;
4777 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4778 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4779 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4780 handled
|= ata_host_intr(ap
, qc
);
4784 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4786 return IRQ_RETVAL(handled
);
4790 * sata_scr_valid - test whether SCRs are accessible
4791 * @ap: ATA port to test SCR accessibility for
4793 * Test whether SCRs are accessible for @ap.
4799 * 1 if SCRs are accessible, 0 otherwise.
4801 int sata_scr_valid(struct ata_port
*ap
)
4803 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4807 * sata_scr_read - read SCR register of the specified port
4808 * @ap: ATA port to read SCR for
4810 * @val: Place to store read value
4812 * Read SCR register @reg of @ap into *@val. This function is
4813 * guaranteed to succeed if the cable type of the port is SATA
4814 * and the port implements ->scr_read.
4820 * 0 on success, negative errno on failure.
4822 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4824 if (sata_scr_valid(ap
)) {
4825 *val
= ap
->ops
->scr_read(ap
, reg
);
4832 * sata_scr_write - write SCR register of the specified port
4833 * @ap: ATA port to write SCR for
4834 * @reg: SCR to write
4835 * @val: value to write
4837 * Write @val to SCR register @reg of @ap. This function is
4838 * guaranteed to succeed if the cable type of the port is SATA
4839 * and the port implements ->scr_read.
4845 * 0 on success, negative errno on failure.
4847 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4849 if (sata_scr_valid(ap
)) {
4850 ap
->ops
->scr_write(ap
, reg
, val
);
4857 * sata_scr_write_flush - write SCR register of the specified port and flush
4858 * @ap: ATA port to write SCR for
4859 * @reg: SCR to write
4860 * @val: value to write
4862 * This function is identical to sata_scr_write() except that this
4863 * function performs flush after writing to the register.
4869 * 0 on success, negative errno on failure.
4871 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4873 if (sata_scr_valid(ap
)) {
4874 ap
->ops
->scr_write(ap
, reg
, val
);
4875 ap
->ops
->scr_read(ap
, reg
);
4882 * ata_port_online - test whether the given port is online
4883 * @ap: ATA port to test
4885 * Test whether @ap is online. Note that this function returns 0
4886 * if online status of @ap cannot be obtained, so
4887 * ata_port_online(ap) != !ata_port_offline(ap).
4893 * 1 if the port online status is available and online.
4895 int ata_port_online(struct ata_port
*ap
)
4899 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4905 * ata_port_offline - test whether the given port is offline
4906 * @ap: ATA port to test
4908 * Test whether @ap is offline. Note that this function returns
4909 * 0 if offline status of @ap cannot be obtained, so
4910 * ata_port_online(ap) != !ata_port_offline(ap).
4916 * 1 if the port offline status is available and offline.
4918 int ata_port_offline(struct ata_port
*ap
)
4922 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4928 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4929 * without filling any other registers
4931 static int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
4933 struct ata_taskfile tf
;
4936 ata_tf_init(dev
, &tf
);
4939 tf
.flags
|= ATA_TFLAG_DEVICE
;
4940 tf
.protocol
= ATA_PROT_NODATA
;
4942 err
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
4944 ata_dev_printk(dev
, KERN_ERR
, "%s: ata command failed: %d\n",
4950 static int ata_flush_cache(struct ata_device
*dev
)
4954 if (!ata_try_flush_cache(dev
))
4957 if (ata_id_has_flush_ext(dev
->id
))
4958 cmd
= ATA_CMD_FLUSH_EXT
;
4960 cmd
= ATA_CMD_FLUSH
;
4962 return ata_do_simple_cmd(dev
, cmd
);
4965 static int ata_standby_drive(struct ata_device
*dev
)
4967 return ata_do_simple_cmd(dev
, ATA_CMD_STANDBYNOW1
);
4970 static int ata_start_drive(struct ata_device
*dev
)
4972 return ata_do_simple_cmd(dev
, ATA_CMD_IDLEIMMEDIATE
);
4976 * ata_device_resume - wakeup a previously suspended devices
4977 * @dev: the device to resume
4979 * Kick the drive back into action, by sending it an idle immediate
4980 * command and making sure its transfer mode matches between drive
4984 int ata_device_resume(struct ata_device
*dev
)
4986 struct ata_port
*ap
= dev
->ap
;
4988 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4989 struct ata_device
*failed_dev
;
4991 ata_busy_wait(ap
, ATA_BUSY
| ATA_DRQ
, 200000);
4993 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4994 while (ata_set_mode(ap
, &failed_dev
))
4995 ata_dev_disable(failed_dev
);
4997 if (!ata_dev_enabled(dev
))
4999 if (dev
->class == ATA_DEV_ATA
)
5000 ata_start_drive(dev
);
5006 * ata_device_suspend - prepare a device for suspend
5007 * @dev: the device to suspend
5008 * @state: target power management state
5010 * Flush the cache on the drive, if appropriate, then issue a
5011 * standbynow command.
5013 int ata_device_suspend(struct ata_device
*dev
, pm_message_t state
)
5015 struct ata_port
*ap
= dev
->ap
;
5017 if (!ata_dev_enabled(dev
))
5019 if (dev
->class == ATA_DEV_ATA
)
5020 ata_flush_cache(dev
);
5022 if (state
.event
!= PM_EVENT_FREEZE
)
5023 ata_standby_drive(dev
);
5024 ap
->flags
|= ATA_FLAG_SUSPENDED
;
5029 * ata_port_start - Set port up for dma.
5030 * @ap: Port to initialize
5032 * Called just after data structures for each port are
5033 * initialized. Allocates space for PRD table.
5035 * May be used as the port_start() entry in ata_port_operations.
5038 * Inherited from caller.
5041 int ata_port_start (struct ata_port
*ap
)
5043 struct device
*dev
= ap
->dev
;
5046 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
5050 rc
= ata_pad_alloc(ap
, dev
);
5052 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5056 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
5063 * ata_port_stop - Undo ata_port_start()
5064 * @ap: Port to shut down
5066 * Frees the PRD table.
5068 * May be used as the port_stop() entry in ata_port_operations.
5071 * Inherited from caller.
5074 void ata_port_stop (struct ata_port
*ap
)
5076 struct device
*dev
= ap
->dev
;
5078 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5079 ata_pad_free(ap
, dev
);
5082 void ata_host_stop (struct ata_host_set
*host_set
)
5084 if (host_set
->mmio_base
)
5085 iounmap(host_set
->mmio_base
);
5090 * ata_host_remove - Unregister SCSI host structure with upper layers
5091 * @ap: Port to unregister
5092 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
5095 * Inherited from caller.
5098 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
5100 struct Scsi_Host
*sh
= ap
->host
;
5105 scsi_remove_host(sh
);
5107 ap
->ops
->port_stop(ap
);
5111 * ata_dev_init - Initialize an ata_device structure
5112 * @dev: Device structure to initialize
5114 * Initialize @dev in preparation for probing.
5117 * Inherited from caller.
5119 void ata_dev_init(struct ata_device
*dev
)
5121 struct ata_port
*ap
= dev
->ap
;
5122 unsigned long flags
;
5124 /* SATA spd limit is bound to the first device */
5125 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5127 /* High bits of dev->flags are used to record warm plug
5128 * requests which occur asynchronously. Synchronize using
5131 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
5132 dev
->flags
&= ~ATA_DFLAG_INIT_MASK
;
5133 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
5135 memset((void *)dev
+ ATA_DEVICE_CLEAR_OFFSET
, 0,
5136 sizeof(*dev
) - ATA_DEVICE_CLEAR_OFFSET
);
5137 dev
->pio_mask
= UINT_MAX
;
5138 dev
->mwdma_mask
= UINT_MAX
;
5139 dev
->udma_mask
= UINT_MAX
;
5143 * ata_host_init - Initialize an ata_port structure
5144 * @ap: Structure to initialize
5145 * @host: associated SCSI mid-layer structure
5146 * @host_set: Collection of hosts to which @ap belongs
5147 * @ent: Probe information provided by low-level driver
5148 * @port_no: Port number associated with this ata_port
5150 * Initialize a new ata_port structure, and its associated
5154 * Inherited from caller.
5156 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
5157 struct ata_host_set
*host_set
,
5158 const struct ata_probe_ent
*ent
, unsigned int port_no
)
5164 host
->max_channel
= 1;
5165 host
->unique_id
= ata_unique_id
++;
5166 host
->max_cmd_len
= 12;
5168 ap
->flags
= ATA_FLAG_DISABLED
;
5169 ap
->id
= host
->unique_id
;
5171 ap
->ctl
= ATA_DEVCTL_OBS
;
5172 ap
->host_set
= host_set
;
5174 ap
->port_no
= port_no
;
5176 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
5177 ap
->pio_mask
= ent
->pio_mask
;
5178 ap
->mwdma_mask
= ent
->mwdma_mask
;
5179 ap
->udma_mask
= ent
->udma_mask
;
5180 ap
->flags
|= ent
->host_flags
;
5181 ap
->ops
= ent
->port_ops
;
5182 ap
->hw_sata_spd_limit
= UINT_MAX
;
5183 ap
->active_tag
= ATA_TAG_POISON
;
5184 ap
->last_ctl
= 0xFF;
5186 #if defined(ATA_VERBOSE_DEBUG)
5187 /* turn on all debugging levels */
5188 ap
->msg_enable
= 0x00FF;
5189 #elif defined(ATA_DEBUG)
5190 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_INFO
| ATA_MSG_CTL
| ATA_MSG_WARN
| ATA_MSG_ERR
;
5192 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_ERR
;
5195 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
5196 INIT_WORK(&ap
->hotplug_task
, ata_scsi_hotplug
, ap
);
5197 INIT_LIST_HEAD(&ap
->eh_done_q
);
5198 init_waitqueue_head(&ap
->eh_wait_q
);
5200 /* set cable type */
5201 ap
->cbl
= ATA_CBL_NONE
;
5202 if (ap
->flags
& ATA_FLAG_SATA
)
5203 ap
->cbl
= ATA_CBL_SATA
;
5205 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
5206 struct ata_device
*dev
= &ap
->device
[i
];
5213 ap
->stats
.unhandled_irq
= 1;
5214 ap
->stats
.idle_irq
= 1;
5217 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
5221 * ata_host_add - Attach low-level ATA driver to system
5222 * @ent: Information provided by low-level driver
5223 * @host_set: Collections of ports to which we add
5224 * @port_no: Port number associated with this host
5226 * Attach low-level ATA driver to system.
5229 * PCI/etc. bus probe sem.
5232 * New ata_port on success, for NULL on error.
5235 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
5236 struct ata_host_set
*host_set
,
5237 unsigned int port_no
)
5239 struct Scsi_Host
*host
;
5240 struct ata_port
*ap
;
5245 if (!ent
->port_ops
->error_handler
&&
5246 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
5247 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
5252 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
5256 host
->transportt
= &ata_scsi_transport_template
;
5258 ap
= ata_shost_to_port(host
);
5260 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
5262 rc
= ap
->ops
->port_start(ap
);
5269 scsi_host_put(host
);
5274 * ata_device_add - Register hardware device with ATA and SCSI layers
5275 * @ent: Probe information describing hardware device to be registered
5277 * This function processes the information provided in the probe
5278 * information struct @ent, allocates the necessary ATA and SCSI
5279 * host information structures, initializes them, and registers
5280 * everything with requisite kernel subsystems.
5282 * This function requests irqs, probes the ATA bus, and probes
5286 * PCI/etc. bus probe sem.
5289 * Number of ports registered. Zero on error (no ports registered).
5291 int ata_device_add(const struct ata_probe_ent
*ent
)
5293 unsigned int count
= 0, i
;
5294 struct device
*dev
= ent
->dev
;
5295 struct ata_host_set
*host_set
;
5299 /* alloc a container for our list of ATA ports (buses) */
5300 host_set
= kzalloc(sizeof(struct ata_host_set
) +
5301 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
5304 spin_lock_init(&host_set
->lock
);
5306 host_set
->dev
= dev
;
5307 host_set
->n_ports
= ent
->n_ports
;
5308 host_set
->irq
= ent
->irq
;
5309 host_set
->mmio_base
= ent
->mmio_base
;
5310 host_set
->private_data
= ent
->private_data
;
5311 host_set
->ops
= ent
->port_ops
;
5312 host_set
->flags
= ent
->host_set_flags
;
5314 /* register each port bound to this device */
5315 for (i
= 0; i
< ent
->n_ports
; i
++) {
5316 struct ata_port
*ap
;
5317 unsigned long xfer_mode_mask
;
5319 ap
= ata_host_add(ent
, host_set
, i
);
5323 host_set
->ports
[i
] = ap
;
5324 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
5325 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
5326 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
5328 /* print per-port info to dmesg */
5329 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
5330 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
5331 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
5332 ata_mode_string(xfer_mode_mask
),
5333 ap
->ioaddr
.cmd_addr
,
5334 ap
->ioaddr
.ctl_addr
,
5335 ap
->ioaddr
.bmdma_addr
,
5339 host_set
->ops
->irq_clear(ap
);
5340 ata_eh_freeze_port(ap
); /* freeze port before requesting IRQ */
5347 /* obtain irq, that is shared between channels */
5348 rc
= request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5349 DRV_NAME
, host_set
);
5351 dev_printk(KERN_ERR
, dev
, "irq %lu request failed: %d\n",
5356 /* perform each probe synchronously */
5357 DPRINTK("probe begin\n");
5358 for (i
= 0; i
< count
; i
++) {
5359 struct ata_port
*ap
;
5363 ap
= host_set
->ports
[i
];
5365 /* init sata_spd_limit to the current value */
5366 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
5367 int spd
= (scontrol
>> 4) & 0xf;
5368 ap
->hw_sata_spd_limit
&= (1 << spd
) - 1;
5370 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5372 rc
= scsi_add_host(ap
->host
, dev
);
5374 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
5375 /* FIXME: do something useful here */
5376 /* FIXME: handle unconditional calls to
5377 * scsi_scan_host and ata_host_remove, below,
5382 if (ap
->ops
->error_handler
) {
5383 unsigned long flags
;
5387 /* kick EH for boot probing */
5388 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
5390 ap
->eh_info
.probe_mask
= (1 << ATA_MAX_DEVICES
) - 1;
5391 ap
->eh_info
.action
|= ATA_EH_SOFTRESET
;
5393 ap
->flags
|= ATA_FLAG_LOADING
;
5394 ata_port_schedule_eh(ap
);
5396 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
5398 /* wait for EH to finish */
5399 ata_port_wait_eh(ap
);
5401 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5402 rc
= ata_bus_probe(ap
);
5403 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5406 /* FIXME: do something useful here?
5407 * Current libata behavior will
5408 * tear down everything when
5409 * the module is removed
5410 * or the h/w is unplugged.
5416 /* probes are done, now scan each port's disk(s) */
5417 DPRINTK("host probe begin\n");
5418 for (i
= 0; i
< count
; i
++) {
5419 struct ata_port
*ap
= host_set
->ports
[i
];
5421 ata_scsi_scan_host(ap
);
5424 dev_set_drvdata(dev
, host_set
);
5426 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5427 return ent
->n_ports
; /* success */
5430 for (i
= 0; i
< count
; i
++) {
5431 ata_host_remove(host_set
->ports
[i
], 1);
5432 scsi_host_put(host_set
->ports
[i
]->host
);
5436 VPRINTK("EXIT, returning 0\n");
5441 * ata_port_detach - Detach ATA port in prepration of device removal
5442 * @ap: ATA port to be detached
5444 * Detach all ATA devices and the associated SCSI devices of @ap;
5445 * then, remove the associated SCSI host. @ap is guaranteed to
5446 * be quiescent on return from this function.
5449 * Kernel thread context (may sleep).
5451 void ata_port_detach(struct ata_port
*ap
)
5453 unsigned long flags
;
5456 if (!ap
->ops
->error_handler
)
5459 /* tell EH we're leaving & flush EH */
5460 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
5461 ap
->flags
|= ATA_FLAG_UNLOADING
;
5462 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
5464 ata_port_wait_eh(ap
);
5466 /* EH is now guaranteed to see UNLOADING, so no new device
5467 * will be attached. Disable all existing devices.
5469 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
5471 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
5472 ata_dev_disable(&ap
->device
[i
]);
5474 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
5476 /* Final freeze & EH. All in-flight commands are aborted. EH
5477 * will be skipped and retrials will be terminated with bad
5480 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
5481 ata_port_freeze(ap
); /* won't be thawed */
5482 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
5484 ata_port_wait_eh(ap
);
5486 /* Flush hotplug task. The sequence is similar to
5487 * ata_port_flush_task().
5489 flush_workqueue(ata_aux_wq
);
5490 cancel_delayed_work(&ap
->hotplug_task
);
5491 flush_workqueue(ata_aux_wq
);
5493 /* remove the associated SCSI host */
5494 scsi_remove_host(ap
->host
);
5498 * ata_host_set_remove - PCI layer callback for device removal
5499 * @host_set: ATA host set that was removed
5501 * Unregister all objects associated with this host set. Free those
5505 * Inherited from calling layer (may sleep).
5508 void ata_host_set_remove(struct ata_host_set
*host_set
)
5512 for (i
= 0; i
< host_set
->n_ports
; i
++)
5513 ata_port_detach(host_set
->ports
[i
]);
5515 free_irq(host_set
->irq
, host_set
);
5517 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5518 struct ata_port
*ap
= host_set
->ports
[i
];
5520 ata_scsi_release(ap
->host
);
5522 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5523 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5525 if (ioaddr
->cmd_addr
== 0x1f0)
5526 release_region(0x1f0, 8);
5527 else if (ioaddr
->cmd_addr
== 0x170)
5528 release_region(0x170, 8);
5531 scsi_host_put(ap
->host
);
5534 if (host_set
->ops
->host_stop
)
5535 host_set
->ops
->host_stop(host_set
);
5541 * ata_scsi_release - SCSI layer callback hook for host unload
5542 * @host: libata host to be unloaded
5544 * Performs all duties necessary to shut down a libata port...
5545 * Kill port kthread, disable port, and release resources.
5548 * Inherited from SCSI layer.
5554 int ata_scsi_release(struct Scsi_Host
*host
)
5556 struct ata_port
*ap
= ata_shost_to_port(host
);
5560 ap
->ops
->port_disable(ap
);
5561 ata_host_remove(ap
, 0);
5568 * ata_std_ports - initialize ioaddr with standard port offsets.
5569 * @ioaddr: IO address structure to be initialized
5571 * Utility function which initializes data_addr, error_addr,
5572 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5573 * device_addr, status_addr, and command_addr to standard offsets
5574 * relative to cmd_addr.
5576 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5579 void ata_std_ports(struct ata_ioports
*ioaddr
)
5581 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5582 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5583 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5584 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5585 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5586 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5587 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5588 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5589 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5590 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5596 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5598 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5600 pci_iounmap(pdev
, host_set
->mmio_base
);
5604 * ata_pci_remove_one - PCI layer callback for device removal
5605 * @pdev: PCI device that was removed
5607 * PCI layer indicates to libata via this hook that
5608 * hot-unplug or module unload event has occurred.
5609 * Handle this by unregistering all objects associated
5610 * with this PCI device. Free those objects. Then finally
5611 * release PCI resources and disable device.
5614 * Inherited from PCI layer (may sleep).
5617 void ata_pci_remove_one (struct pci_dev
*pdev
)
5619 struct device
*dev
= pci_dev_to_dev(pdev
);
5620 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5622 ata_host_set_remove(host_set
);
5623 pci_release_regions(pdev
);
5624 pci_disable_device(pdev
);
5625 dev_set_drvdata(dev
, NULL
);
5628 /* move to PCI subsystem */
5629 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5631 unsigned long tmp
= 0;
5633 switch (bits
->width
) {
5636 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5642 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5648 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5659 return (tmp
== bits
->val
) ? 1 : 0;
5662 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5664 pci_save_state(pdev
);
5665 pci_disable_device(pdev
);
5666 pci_set_power_state(pdev
, PCI_D3hot
);
5670 int ata_pci_device_resume(struct pci_dev
*pdev
)
5672 pci_set_power_state(pdev
, PCI_D0
);
5673 pci_restore_state(pdev
);
5674 pci_enable_device(pdev
);
5675 pci_set_master(pdev
);
5678 #endif /* CONFIG_PCI */
5681 static int __init
ata_init(void)
5683 ata_wq
= create_workqueue("ata");
5687 ata_aux_wq
= create_singlethread_workqueue("ata_aux");
5689 destroy_workqueue(ata_wq
);
5693 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5697 static void __exit
ata_exit(void)
5699 destroy_workqueue(ata_wq
);
5700 destroy_workqueue(ata_aux_wq
);
5703 module_init(ata_init
);
5704 module_exit(ata_exit
);
5706 static unsigned long ratelimit_time
;
5707 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5709 int ata_ratelimit(void)
5712 unsigned long flags
;
5714 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5716 if (time_after(jiffies
, ratelimit_time
)) {
5718 ratelimit_time
= jiffies
+ (HZ
/5);
5722 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5728 * ata_wait_register - wait until register value changes
5729 * @reg: IO-mapped register
5730 * @mask: Mask to apply to read register value
5731 * @val: Wait condition
5732 * @interval_msec: polling interval in milliseconds
5733 * @timeout_msec: timeout in milliseconds
5735 * Waiting for some bits of register to change is a common
5736 * operation for ATA controllers. This function reads 32bit LE
5737 * IO-mapped register @reg and tests for the following condition.
5739 * (*@reg & mask) != val
5741 * If the condition is met, it returns; otherwise, the process is
5742 * repeated after @interval_msec until timeout.
5745 * Kernel thread context (may sleep)
5748 * The final register value.
5750 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5751 unsigned long interval_msec
,
5752 unsigned long timeout_msec
)
5754 unsigned long timeout
;
5757 tmp
= ioread32(reg
);
5759 /* Calculate timeout _after_ the first read to make sure
5760 * preceding writes reach the controller before starting to
5761 * eat away the timeout.
5763 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5765 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5766 msleep(interval_msec
);
5767 tmp
= ioread32(reg
);
5774 * libata is essentially a library of internal helper functions for
5775 * low-level ATA host controller drivers. As such, the API/ABI is
5776 * likely to change as new drivers are added and updated.
5777 * Do not depend on ABI/API stability.
5780 EXPORT_SYMBOL_GPL(sata_deb_timing_boot
);
5781 EXPORT_SYMBOL_GPL(sata_deb_timing_eh
);
5782 EXPORT_SYMBOL_GPL(sata_deb_timing_before_fsrst
);
5783 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5784 EXPORT_SYMBOL_GPL(ata_std_ports
);
5785 EXPORT_SYMBOL_GPL(ata_device_add
);
5786 EXPORT_SYMBOL_GPL(ata_port_detach
);
5787 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5788 EXPORT_SYMBOL_GPL(ata_sg_init
);
5789 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5790 EXPORT_SYMBOL_GPL(ata_hsm_move
);
5791 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5792 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple
);
5793 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5794 EXPORT_SYMBOL_GPL(ata_tf_load
);
5795 EXPORT_SYMBOL_GPL(ata_tf_read
);
5796 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5797 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5798 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5799 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5800 EXPORT_SYMBOL_GPL(ata_check_status
);
5801 EXPORT_SYMBOL_GPL(ata_altstatus
);
5802 EXPORT_SYMBOL_GPL(ata_exec_command
);
5803 EXPORT_SYMBOL_GPL(ata_port_start
);
5804 EXPORT_SYMBOL_GPL(ata_port_stop
);
5805 EXPORT_SYMBOL_GPL(ata_host_stop
);
5806 EXPORT_SYMBOL_GPL(ata_interrupt
);
5807 EXPORT_SYMBOL_GPL(ata_mmio_data_xfer
);
5808 EXPORT_SYMBOL_GPL(ata_pio_data_xfer
);
5809 EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq
);
5810 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5811 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5812 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5813 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5814 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5815 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5816 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5817 EXPORT_SYMBOL_GPL(ata_bmdma_freeze
);
5818 EXPORT_SYMBOL_GPL(ata_bmdma_thaw
);
5819 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh
);
5820 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler
);
5821 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd
);
5822 EXPORT_SYMBOL_GPL(ata_port_probe
);
5823 EXPORT_SYMBOL_GPL(sata_set_spd
);
5824 EXPORT_SYMBOL_GPL(sata_phy_debounce
);
5825 EXPORT_SYMBOL_GPL(sata_phy_resume
);
5826 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5827 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5828 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5829 EXPORT_SYMBOL_GPL(ata_std_prereset
);
5830 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5831 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5832 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5833 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5834 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5835 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5836 EXPORT_SYMBOL_GPL(ata_port_disable
);
5837 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5838 EXPORT_SYMBOL_GPL(ata_wait_register
);
5839 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5840 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5841 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5842 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5843 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5844 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy
);
5845 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth
);
5846 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5847 EXPORT_SYMBOL_GPL(ata_host_intr
);
5848 EXPORT_SYMBOL_GPL(sata_scr_valid
);
5849 EXPORT_SYMBOL_GPL(sata_scr_read
);
5850 EXPORT_SYMBOL_GPL(sata_scr_write
);
5851 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
5852 EXPORT_SYMBOL_GPL(ata_port_online
);
5853 EXPORT_SYMBOL_GPL(ata_port_offline
);
5854 EXPORT_SYMBOL_GPL(ata_id_string
);
5855 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5856 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5858 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5859 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5860 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5863 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5864 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5865 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5866 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5867 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5868 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5869 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5870 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5871 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5872 #endif /* CONFIG_PCI */
5874 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5875 EXPORT_SYMBOL_GPL(ata_device_resume
);
5876 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5877 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5879 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5880 EXPORT_SYMBOL_GPL(ata_port_schedule_eh
);
5881 EXPORT_SYMBOL_GPL(ata_port_abort
);
5882 EXPORT_SYMBOL_GPL(ata_port_freeze
);
5883 EXPORT_SYMBOL_GPL(ata_eh_freeze_port
);
5884 EXPORT_SYMBOL_GPL(ata_eh_thaw_port
);
5885 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5886 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5887 EXPORT_SYMBOL_GPL(ata_do_eh
);