2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/pci.h>
38 #include <linux/init.h>
39 #include <linux/list.h>
41 #include <linux/highmem.h>
42 #include <linux/spinlock.h>
43 #include <linux/blkdev.h>
44 #include <linux/delay.h>
45 #include <linux/timer.h>
46 #include <linux/interrupt.h>
47 #include <linux/completion.h>
48 #include <linux/suspend.h>
49 #include <linux/workqueue.h>
50 #include <linux/jiffies.h>
51 #include <linux/scatterlist.h>
52 #include <scsi/scsi.h>
53 #include <scsi/scsi_cmnd.h>
54 #include <scsi/scsi_host.h>
55 #include <linux/libata.h>
57 #include <asm/semaphore.h>
58 #include <asm/byteorder.h>
62 /* debounce timing parameters in msecs { interval, duration, timeout } */
63 const unsigned long sata_deb_timing_normal
[] = { 5, 100, 2000 };
64 const unsigned long sata_deb_timing_hotplug
[] = { 25, 500, 2000 };
65 const unsigned long sata_deb_timing_long
[] = { 100, 2000, 5000 };
67 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
68 u16 heads
, u16 sectors
);
69 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
);
70 static void ata_dev_xfermask(struct ata_device
*dev
);
72 static unsigned int ata_unique_id
= 1;
73 static struct workqueue_struct
*ata_wq
;
75 struct workqueue_struct
*ata_aux_wq
;
77 int atapi_enabled
= 1;
78 module_param(atapi_enabled
, int, 0444);
79 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
82 module_param(atapi_dmadir
, int, 0444);
83 MODULE_PARM_DESC(atapi_dmadir
, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
86 module_param_named(fua
, libata_fua
, int, 0444);
87 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
89 static int ata_probe_timeout
= ATA_TMOUT_INTERNAL
/ HZ
;
90 module_param(ata_probe_timeout
, int, 0444);
91 MODULE_PARM_DESC(ata_probe_timeout
, "Set ATA probing timeout (seconds)");
93 MODULE_AUTHOR("Jeff Garzik");
94 MODULE_DESCRIPTION("Library module for ATA devices");
95 MODULE_LICENSE("GPL");
96 MODULE_VERSION(DRV_VERSION
);
100 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
101 * @tf: Taskfile to convert
102 * @fis: Buffer into which data will output
103 * @pmp: Port multiplier port
105 * Converts a standard ATA taskfile to a Serial ATA
106 * FIS structure (Register - Host to Device).
109 * Inherited from caller.
112 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
114 fis
[0] = 0x27; /* Register - Host to Device FIS */
115 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
116 bit 7 indicates Command FIS */
117 fis
[2] = tf
->command
;
118 fis
[3] = tf
->feature
;
125 fis
[8] = tf
->hob_lbal
;
126 fis
[9] = tf
->hob_lbam
;
127 fis
[10] = tf
->hob_lbah
;
128 fis
[11] = tf
->hob_feature
;
131 fis
[13] = tf
->hob_nsect
;
142 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
143 * @fis: Buffer from which data will be input
144 * @tf: Taskfile to output
146 * Converts a serial ATA FIS structure to a standard ATA taskfile.
149 * Inherited from caller.
152 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
154 tf
->command
= fis
[2]; /* status */
155 tf
->feature
= fis
[3]; /* error */
162 tf
->hob_lbal
= fis
[8];
163 tf
->hob_lbam
= fis
[9];
164 tf
->hob_lbah
= fis
[10];
167 tf
->hob_nsect
= fis
[13];
170 static const u8 ata_rw_cmds
[] = {
174 ATA_CMD_READ_MULTI_EXT
,
175 ATA_CMD_WRITE_MULTI_EXT
,
179 ATA_CMD_WRITE_MULTI_FUA_EXT
,
183 ATA_CMD_PIO_READ_EXT
,
184 ATA_CMD_PIO_WRITE_EXT
,
197 ATA_CMD_WRITE_FUA_EXT
201 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
202 * @qc: command to examine and configure
204 * Examine the device configuration and tf->flags to calculate
205 * the proper read/write commands and protocol to use.
210 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
212 struct ata_taskfile
*tf
= &qc
->tf
;
213 struct ata_device
*dev
= qc
->dev
;
216 int index
, fua
, lba48
, write
;
218 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
219 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
220 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
222 if (dev
->flags
& ATA_DFLAG_PIO
) {
223 tf
->protocol
= ATA_PROT_PIO
;
224 index
= dev
->multi_count
? 0 : 8;
225 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
226 /* Unable to use DMA due to host limitation */
227 tf
->protocol
= ATA_PROT_PIO
;
228 index
= dev
->multi_count
? 0 : 8;
230 tf
->protocol
= ATA_PROT_DMA
;
234 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
243 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
244 * @pio_mask: pio_mask
245 * @mwdma_mask: mwdma_mask
246 * @udma_mask: udma_mask
248 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
249 * unsigned int xfer_mask.
257 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
258 unsigned int mwdma_mask
,
259 unsigned int udma_mask
)
261 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
262 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
263 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
267 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
268 * @xfer_mask: xfer_mask to unpack
269 * @pio_mask: resulting pio_mask
270 * @mwdma_mask: resulting mwdma_mask
271 * @udma_mask: resulting udma_mask
273 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
274 * Any NULL distination masks will be ignored.
276 static void ata_unpack_xfermask(unsigned int xfer_mask
,
277 unsigned int *pio_mask
,
278 unsigned int *mwdma_mask
,
279 unsigned int *udma_mask
)
282 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
284 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
286 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
289 static const struct ata_xfer_ent
{
293 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
294 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
295 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
300 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
301 * @xfer_mask: xfer_mask of interest
303 * Return matching XFER_* value for @xfer_mask. Only the highest
304 * bit of @xfer_mask is considered.
310 * Matching XFER_* value, 0 if no match found.
312 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
314 int highbit
= fls(xfer_mask
) - 1;
315 const struct ata_xfer_ent
*ent
;
317 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
318 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
319 return ent
->base
+ highbit
- ent
->shift
;
324 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
325 * @xfer_mode: XFER_* of interest
327 * Return matching xfer_mask for @xfer_mode.
333 * Matching xfer_mask, 0 if no match found.
335 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
337 const struct ata_xfer_ent
*ent
;
339 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
340 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
341 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
346 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
347 * @xfer_mode: XFER_* of interest
349 * Return matching xfer_shift for @xfer_mode.
355 * Matching xfer_shift, -1 if no match found.
357 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
359 const struct ata_xfer_ent
*ent
;
361 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
362 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
368 * ata_mode_string - convert xfer_mask to string
369 * @xfer_mask: mask of bits supported; only highest bit counts.
371 * Determine string which represents the highest speed
372 * (highest bit in @modemask).
378 * Constant C string representing highest speed listed in
379 * @mode_mask, or the constant C string "<n/a>".
381 static const char *ata_mode_string(unsigned int xfer_mask
)
383 static const char * const xfer_mode_str
[] = {
403 highbit
= fls(xfer_mask
) - 1;
404 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
405 return xfer_mode_str
[highbit
];
409 static const char *sata_spd_string(unsigned int spd
)
411 static const char * const spd_str
[] = {
416 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
418 return spd_str
[spd
- 1];
421 void ata_dev_disable(struct ata_device
*dev
)
423 if (ata_dev_enabled(dev
) && ata_msg_drv(dev
->ap
)) {
424 ata_dev_printk(dev
, KERN_WARNING
, "disabled\n");
430 * ata_pio_devchk - PATA device presence detection
431 * @ap: ATA channel to examine
432 * @device: Device to examine (starting at zero)
434 * This technique was originally described in
435 * Hale Landis's ATADRVR (www.ata-atapi.com), and
436 * later found its way into the ATA/ATAPI spec.
438 * Write a pattern to the ATA shadow registers,
439 * and if a device is present, it will respond by
440 * correctly storing and echoing back the
441 * ATA shadow register contents.
447 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
450 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
453 ap
->ops
->dev_select(ap
, device
);
455 outb(0x55, ioaddr
->nsect_addr
);
456 outb(0xaa, ioaddr
->lbal_addr
);
458 outb(0xaa, ioaddr
->nsect_addr
);
459 outb(0x55, ioaddr
->lbal_addr
);
461 outb(0x55, ioaddr
->nsect_addr
);
462 outb(0xaa, ioaddr
->lbal_addr
);
464 nsect
= inb(ioaddr
->nsect_addr
);
465 lbal
= inb(ioaddr
->lbal_addr
);
467 if ((nsect
== 0x55) && (lbal
== 0xaa))
468 return 1; /* we found a device */
470 return 0; /* nothing found */
474 * ata_mmio_devchk - PATA device presence detection
475 * @ap: ATA channel to examine
476 * @device: Device to examine (starting at zero)
478 * This technique was originally described in
479 * Hale Landis's ATADRVR (www.ata-atapi.com), and
480 * later found its way into the ATA/ATAPI spec.
482 * Write a pattern to the ATA shadow registers,
483 * and if a device is present, it will respond by
484 * correctly storing and echoing back the
485 * ATA shadow register contents.
491 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
494 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
497 ap
->ops
->dev_select(ap
, device
);
499 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
500 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
502 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
503 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
505 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
506 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
508 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
509 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
511 if ((nsect
== 0x55) && (lbal
== 0xaa))
512 return 1; /* we found a device */
514 return 0; /* nothing found */
518 * ata_devchk - PATA device presence detection
519 * @ap: ATA channel to examine
520 * @device: Device to examine (starting at zero)
522 * Dispatch ATA device presence detection, depending
523 * on whether we are using PIO or MMIO to talk to the
524 * ATA shadow registers.
530 static unsigned int ata_devchk(struct ata_port
*ap
,
533 if (ap
->flags
& ATA_FLAG_MMIO
)
534 return ata_mmio_devchk(ap
, device
);
535 return ata_pio_devchk(ap
, device
);
539 * ata_dev_classify - determine device type based on ATA-spec signature
540 * @tf: ATA taskfile register set for device to be identified
542 * Determine from taskfile register contents whether a device is
543 * ATA or ATAPI, as per "Signature and persistence" section
544 * of ATA/PI spec (volume 1, sect 5.14).
550 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
551 * the event of failure.
554 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
556 /* Apple's open source Darwin code hints that some devices only
557 * put a proper signature into the LBA mid/high registers,
558 * So, we only check those. It's sufficient for uniqueness.
561 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
562 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
563 DPRINTK("found ATA device by sig\n");
567 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
568 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
569 DPRINTK("found ATAPI device by sig\n");
570 return ATA_DEV_ATAPI
;
573 DPRINTK("unknown device\n");
574 return ATA_DEV_UNKNOWN
;
578 * ata_dev_try_classify - Parse returned ATA device signature
579 * @ap: ATA channel to examine
580 * @device: Device to examine (starting at zero)
581 * @r_err: Value of error register on completion
583 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
584 * an ATA/ATAPI-defined set of values is placed in the ATA
585 * shadow registers, indicating the results of device detection
588 * Select the ATA device, and read the values from the ATA shadow
589 * registers. Then parse according to the Error register value,
590 * and the spec-defined values examined by ata_dev_classify().
596 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
600 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
602 struct ata_taskfile tf
;
606 ap
->ops
->dev_select(ap
, device
);
608 memset(&tf
, 0, sizeof(tf
));
610 ap
->ops
->tf_read(ap
, &tf
);
615 /* see if device passed diags */
618 else if ((device
== 0) && (err
== 0x81))
623 /* determine if device is ATA or ATAPI */
624 class = ata_dev_classify(&tf
);
626 if (class == ATA_DEV_UNKNOWN
)
628 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
634 * ata_id_string - Convert IDENTIFY DEVICE page into string
635 * @id: IDENTIFY DEVICE results we will examine
636 * @s: string into which data is output
637 * @ofs: offset into identify device page
638 * @len: length of string to return. must be an even number.
640 * The strings in the IDENTIFY DEVICE page are broken up into
641 * 16-bit chunks. Run through the string, and output each
642 * 8-bit chunk linearly, regardless of platform.
648 void ata_id_string(const u16
*id
, unsigned char *s
,
649 unsigned int ofs
, unsigned int len
)
668 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
669 * @id: IDENTIFY DEVICE results we will examine
670 * @s: string into which data is output
671 * @ofs: offset into identify device page
672 * @len: length of string to return. must be an odd number.
674 * This function is identical to ata_id_string except that it
675 * trims trailing spaces and terminates the resulting string with
676 * null. @len must be actual maximum length (even number) + 1.
681 void ata_id_c_string(const u16
*id
, unsigned char *s
,
682 unsigned int ofs
, unsigned int len
)
688 ata_id_string(id
, s
, ofs
, len
- 1);
690 p
= s
+ strnlen(s
, len
- 1);
691 while (p
> s
&& p
[-1] == ' ')
696 static u64
ata_id_n_sectors(const u16
*id
)
698 if (ata_id_has_lba(id
)) {
699 if (ata_id_has_lba48(id
))
700 return ata_id_u64(id
, 100);
702 return ata_id_u32(id
, 60);
704 if (ata_id_current_chs_valid(id
))
705 return ata_id_u32(id
, 57);
707 return id
[1] * id
[3] * id
[6];
712 * ata_noop_dev_select - Select device 0/1 on ATA bus
713 * @ap: ATA channel to manipulate
714 * @device: ATA device (numbered from zero) to select
716 * This function performs no actual function.
718 * May be used as the dev_select() entry in ata_port_operations.
723 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
729 * ata_std_dev_select - Select device 0/1 on ATA bus
730 * @ap: ATA channel to manipulate
731 * @device: ATA device (numbered from zero) to select
733 * Use the method defined in the ATA specification to
734 * make either device 0, or device 1, active on the
735 * ATA channel. Works with both PIO and MMIO.
737 * May be used as the dev_select() entry in ata_port_operations.
743 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
748 tmp
= ATA_DEVICE_OBS
;
750 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
752 if (ap
->flags
& ATA_FLAG_MMIO
) {
753 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
755 outb(tmp
, ap
->ioaddr
.device_addr
);
757 ata_pause(ap
); /* needed; also flushes, for mmio */
761 * ata_dev_select - Select device 0/1 on ATA bus
762 * @ap: ATA channel to manipulate
763 * @device: ATA device (numbered from zero) to select
764 * @wait: non-zero to wait for Status register BSY bit to clear
765 * @can_sleep: non-zero if context allows sleeping
767 * Use the method defined in the ATA specification to
768 * make either device 0, or device 1, active on the
771 * This is a high-level version of ata_std_dev_select(),
772 * which additionally provides the services of inserting
773 * the proper pauses and status polling, where needed.
779 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
780 unsigned int wait
, unsigned int can_sleep
)
782 if (ata_msg_probe(ap
))
783 ata_port_printk(ap
, KERN_INFO
, "ata_dev_select: ENTER, ata%u: "
784 "device %u, wait %u\n", ap
->id
, device
, wait
);
789 ap
->ops
->dev_select(ap
, device
);
792 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
799 * ata_dump_id - IDENTIFY DEVICE info debugging output
800 * @id: IDENTIFY DEVICE page to dump
802 * Dump selected 16-bit words from the given IDENTIFY DEVICE
809 static inline void ata_dump_id(const u16
*id
)
811 DPRINTK("49==0x%04x "
821 DPRINTK("80==0x%04x "
831 DPRINTK("88==0x%04x "
838 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
839 * @id: IDENTIFY data to compute xfer mask from
841 * Compute the xfermask for this device. This is not as trivial
842 * as it seems if we must consider early devices correctly.
844 * FIXME: pre IDE drive timing (do we care ?).
852 static unsigned int ata_id_xfermask(const u16
*id
)
854 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
856 /* Usual case. Word 53 indicates word 64 is valid */
857 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
858 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
862 /* If word 64 isn't valid then Word 51 high byte holds
863 * the PIO timing number for the maximum. Turn it into
866 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
868 /* But wait.. there's more. Design your standards by
869 * committee and you too can get a free iordy field to
870 * process. However its the speeds not the modes that
871 * are supported... Note drivers using the timing API
872 * will get this right anyway
876 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
879 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
880 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
882 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
886 * ata_port_queue_task - Queue port_task
887 * @ap: The ata_port to queue port_task for
888 * @fn: workqueue function to be scheduled
889 * @data: data value to pass to workqueue function
890 * @delay: delay time for workqueue function
892 * Schedule @fn(@data) for execution after @delay jiffies using
893 * port_task. There is one port_task per port and it's the
894 * user(low level driver)'s responsibility to make sure that only
895 * one task is active at any given time.
897 * libata core layer takes care of synchronization between
898 * port_task and EH. ata_port_queue_task() may be ignored for EH
902 * Inherited from caller.
904 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
909 if (ap
->pflags
& ATA_PFLAG_FLUSH_PORT_TASK
)
912 PREPARE_WORK(&ap
->port_task
, fn
, data
);
915 rc
= queue_work(ata_wq
, &ap
->port_task
);
917 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
919 /* rc == 0 means that another user is using port task */
924 * ata_port_flush_task - Flush port_task
925 * @ap: The ata_port to flush port_task for
927 * After this function completes, port_task is guranteed not to
928 * be running or scheduled.
931 * Kernel thread context (may sleep)
933 void ata_port_flush_task(struct ata_port
*ap
)
939 spin_lock_irqsave(ap
->lock
, flags
);
940 ap
->pflags
|= ATA_PFLAG_FLUSH_PORT_TASK
;
941 spin_unlock_irqrestore(ap
->lock
, flags
);
943 DPRINTK("flush #1\n");
944 flush_workqueue(ata_wq
);
947 * At this point, if a task is running, it's guaranteed to see
948 * the FLUSH flag; thus, it will never queue pio tasks again.
951 if (!cancel_delayed_work(&ap
->port_task
)) {
953 ata_port_printk(ap
, KERN_DEBUG
, "%s: flush #2\n",
955 flush_workqueue(ata_wq
);
958 spin_lock_irqsave(ap
->lock
, flags
);
959 ap
->pflags
&= ~ATA_PFLAG_FLUSH_PORT_TASK
;
960 spin_unlock_irqrestore(ap
->lock
, flags
);
963 ata_port_printk(ap
, KERN_DEBUG
, "%s: EXIT\n", __FUNCTION__
);
966 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
968 struct completion
*waiting
= qc
->private_data
;
974 * ata_exec_internal - execute libata internal command
975 * @dev: Device to which the command is sent
976 * @tf: Taskfile registers for the command and the result
977 * @cdb: CDB for packet command
978 * @dma_dir: Data tranfer direction of the command
979 * @buf: Data buffer of the command
980 * @buflen: Length of data buffer
982 * Executes libata internal command with timeout. @tf contains
983 * command on entry and result on return. Timeout and error
984 * conditions are reported via return value. No recovery action
985 * is taken after a command times out. It's caller's duty to
986 * clean up after timeout.
989 * None. Should be called with kernel context, might sleep.
992 * Zero on success, AC_ERR_* mask on failure
994 unsigned ata_exec_internal(struct ata_device
*dev
,
995 struct ata_taskfile
*tf
, const u8
*cdb
,
996 int dma_dir
, void *buf
, unsigned int buflen
)
998 struct ata_port
*ap
= dev
->ap
;
999 u8 command
= tf
->command
;
1000 struct ata_queued_cmd
*qc
;
1001 unsigned int tag
, preempted_tag
;
1002 u32 preempted_sactive
, preempted_qc_active
;
1003 DECLARE_COMPLETION_ONSTACK(wait
);
1004 unsigned long flags
;
1005 unsigned int err_mask
;
1008 spin_lock_irqsave(ap
->lock
, flags
);
1010 /* no internal command while frozen */
1011 if (ap
->pflags
& ATA_PFLAG_FROZEN
) {
1012 spin_unlock_irqrestore(ap
->lock
, flags
);
1013 return AC_ERR_SYSTEM
;
1016 /* initialize internal qc */
1018 /* XXX: Tag 0 is used for drivers with legacy EH as some
1019 * drivers choke if any other tag is given. This breaks
1020 * ata_tag_internal() test for those drivers. Don't use new
1021 * EH stuff without converting to it.
1023 if (ap
->ops
->error_handler
)
1024 tag
= ATA_TAG_INTERNAL
;
1028 if (test_and_set_bit(tag
, &ap
->qc_allocated
))
1030 qc
= __ata_qc_from_tag(ap
, tag
);
1038 preempted_tag
= ap
->active_tag
;
1039 preempted_sactive
= ap
->sactive
;
1040 preempted_qc_active
= ap
->qc_active
;
1041 ap
->active_tag
= ATA_TAG_POISON
;
1045 /* prepare & issue qc */
1048 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1049 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1050 qc
->dma_dir
= dma_dir
;
1051 if (dma_dir
!= DMA_NONE
) {
1052 ata_sg_init_one(qc
, buf
, buflen
);
1053 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1056 qc
->private_data
= &wait
;
1057 qc
->complete_fn
= ata_qc_complete_internal
;
1061 spin_unlock_irqrestore(ap
->lock
, flags
);
1063 rc
= wait_for_completion_timeout(&wait
, ata_probe_timeout
);
1065 ata_port_flush_task(ap
);
1068 spin_lock_irqsave(ap
->lock
, flags
);
1070 /* We're racing with irq here. If we lose, the
1071 * following test prevents us from completing the qc
1072 * twice. If we win, the port is frozen and will be
1073 * cleaned up by ->post_internal_cmd().
1075 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1076 qc
->err_mask
|= AC_ERR_TIMEOUT
;
1078 if (ap
->ops
->error_handler
)
1079 ata_port_freeze(ap
);
1081 ata_qc_complete(qc
);
1083 if (ata_msg_warn(ap
))
1084 ata_dev_printk(dev
, KERN_WARNING
,
1085 "qc timeout (cmd 0x%x)\n", command
);
1088 spin_unlock_irqrestore(ap
->lock
, flags
);
1091 /* do post_internal_cmd */
1092 if (ap
->ops
->post_internal_cmd
)
1093 ap
->ops
->post_internal_cmd(qc
);
1095 if (qc
->flags
& ATA_QCFLAG_FAILED
&& !qc
->err_mask
) {
1096 if (ata_msg_warn(ap
))
1097 ata_dev_printk(dev
, KERN_WARNING
,
1098 "zero err_mask for failed "
1099 "internal command, assuming AC_ERR_OTHER\n");
1100 qc
->err_mask
|= AC_ERR_OTHER
;
1104 spin_lock_irqsave(ap
->lock
, flags
);
1106 *tf
= qc
->result_tf
;
1107 err_mask
= qc
->err_mask
;
1110 ap
->active_tag
= preempted_tag
;
1111 ap
->sactive
= preempted_sactive
;
1112 ap
->qc_active
= preempted_qc_active
;
1114 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1115 * Until those drivers are fixed, we detect the condition
1116 * here, fail the command with AC_ERR_SYSTEM and reenable the
1119 * Note that this doesn't change any behavior as internal
1120 * command failure results in disabling the device in the
1121 * higher layer for LLDDs without new reset/EH callbacks.
1123 * Kill the following code as soon as those drivers are fixed.
1125 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1126 err_mask
|= AC_ERR_SYSTEM
;
1130 spin_unlock_irqrestore(ap
->lock
, flags
);
1136 * ata_do_simple_cmd - execute simple internal command
1137 * @dev: Device to which the command is sent
1138 * @cmd: Opcode to execute
1140 * Execute a 'simple' command, that only consists of the opcode
1141 * 'cmd' itself, without filling any other registers
1144 * Kernel thread context (may sleep).
1147 * Zero on success, AC_ERR_* mask on failure
1149 unsigned int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
1151 struct ata_taskfile tf
;
1153 ata_tf_init(dev
, &tf
);
1156 tf
.flags
|= ATA_TFLAG_DEVICE
;
1157 tf
.protocol
= ATA_PROT_NODATA
;
1159 return ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
1163 * ata_pio_need_iordy - check if iordy needed
1166 * Check if the current speed of the device requires IORDY. Used
1167 * by various controllers for chip configuration.
1170 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1173 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1180 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1182 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1183 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1184 /* Is the speed faster than the drive allows non IORDY ? */
1186 /* This is cycle times not frequency - watch the logic! */
1187 if (pio
> 240) /* PIO2 is 240nS per cycle */
1196 * ata_dev_read_id - Read ID data from the specified device
1197 * @dev: target device
1198 * @p_class: pointer to class of the target device (may be changed)
1199 * @post_reset: is this read ID post-reset?
1200 * @id: buffer to read IDENTIFY data into
1202 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1203 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1204 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1205 * for pre-ATA4 drives.
1208 * Kernel thread context (may sleep)
1211 * 0 on success, -errno otherwise.
1213 int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1214 int post_reset
, u16
*id
)
1216 struct ata_port
*ap
= dev
->ap
;
1217 unsigned int class = *p_class
;
1218 struct ata_taskfile tf
;
1219 unsigned int err_mask
= 0;
1223 if (ata_msg_ctl(ap
))
1224 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1225 __FUNCTION__
, ap
->id
, dev
->devno
);
1227 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1230 ata_tf_init(dev
, &tf
);
1234 tf
.command
= ATA_CMD_ID_ATA
;
1237 tf
.command
= ATA_CMD_ID_ATAPI
;
1241 reason
= "unsupported class";
1245 tf
.protocol
= ATA_PROT_PIO
;
1247 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1248 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1251 reason
= "I/O error";
1255 swap_buf_le16(id
, ATA_ID_WORDS
);
1258 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1260 reason
= "device reports illegal type";
1264 if (post_reset
&& class == ATA_DEV_ATA
) {
1266 * The exact sequence expected by certain pre-ATA4 drives is:
1269 * INITIALIZE DEVICE PARAMETERS
1271 * Some drives were very specific about that exact sequence.
1273 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1274 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1277 reason
= "INIT_DEV_PARAMS failed";
1281 /* current CHS translation info (id[53-58]) might be
1282 * changed. reread the identify device info.
1294 if (ata_msg_warn(ap
))
1295 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1296 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1300 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1302 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1305 static void ata_dev_config_ncq(struct ata_device
*dev
,
1306 char *desc
, size_t desc_sz
)
1308 struct ata_port
*ap
= dev
->ap
;
1309 int hdepth
= 0, ddepth
= ata_id_queue_depth(dev
->id
);
1311 if (!ata_id_has_ncq(dev
->id
)) {
1316 if (ap
->flags
& ATA_FLAG_NCQ
) {
1317 hdepth
= min(ap
->host
->can_queue
, ATA_MAX_QUEUE
- 1);
1318 dev
->flags
|= ATA_DFLAG_NCQ
;
1321 if (hdepth
>= ddepth
)
1322 snprintf(desc
, desc_sz
, "NCQ (depth %d)", ddepth
);
1324 snprintf(desc
, desc_sz
, "NCQ (depth %d/%d)", hdepth
, ddepth
);
1327 static void ata_set_port_max_cmd_len(struct ata_port
*ap
)
1332 ap
->host
->max_cmd_len
= 0;
1333 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1334 ap
->host
->max_cmd_len
= max_t(unsigned int,
1335 ap
->host
->max_cmd_len
,
1336 ap
->device
[i
].cdb_len
);
1341 * ata_dev_configure - Configure the specified ATA/ATAPI device
1342 * @dev: Target device to configure
1343 * @print_info: Enable device info printout
1345 * Configure @dev according to @dev->id. Generic and low-level
1346 * driver specific fixups are also applied.
1349 * Kernel thread context (may sleep)
1352 * 0 on success, -errno otherwise
1354 int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1356 struct ata_port
*ap
= dev
->ap
;
1357 const u16
*id
= dev
->id
;
1358 unsigned int xfer_mask
;
1361 if (!ata_dev_enabled(dev
) && ata_msg_info(ap
)) {
1362 ata_dev_printk(dev
, KERN_INFO
,
1363 "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
1364 __FUNCTION__
, ap
->id
, dev
->devno
);
1368 if (ata_msg_probe(ap
))
1369 ata_dev_printk(dev
, KERN_DEBUG
, "%s: ENTER, host %u, dev %u\n",
1370 __FUNCTION__
, ap
->id
, dev
->devno
);
1372 /* print device capabilities */
1373 if (ata_msg_probe(ap
))
1374 ata_dev_printk(dev
, KERN_DEBUG
,
1375 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
1376 "85:%04x 86:%04x 87:%04x 88:%04x\n",
1378 id
[49], id
[82], id
[83], id
[84],
1379 id
[85], id
[86], id
[87], id
[88]);
1381 /* initialize to-be-configured parameters */
1382 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1383 dev
->max_sectors
= 0;
1391 * common ATA, ATAPI feature tests
1394 /* find max transfer mode; for printk only */
1395 xfer_mask
= ata_id_xfermask(id
);
1397 if (ata_msg_probe(ap
))
1400 /* ATA-specific feature tests */
1401 if (dev
->class == ATA_DEV_ATA
) {
1402 dev
->n_sectors
= ata_id_n_sectors(id
);
1404 if (ata_id_has_lba(id
)) {
1405 const char *lba_desc
;
1409 dev
->flags
|= ATA_DFLAG_LBA
;
1410 if (ata_id_has_lba48(id
)) {
1411 dev
->flags
|= ATA_DFLAG_LBA48
;
1416 ata_dev_config_ncq(dev
, ncq_desc
, sizeof(ncq_desc
));
1418 /* print device info to dmesg */
1419 if (ata_msg_drv(ap
) && print_info
)
1420 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1421 "max %s, %Lu sectors: %s %s\n",
1422 ata_id_major_version(id
),
1423 ata_mode_string(xfer_mask
),
1424 (unsigned long long)dev
->n_sectors
,
1425 lba_desc
, ncq_desc
);
1429 /* Default translation */
1430 dev
->cylinders
= id
[1];
1432 dev
->sectors
= id
[6];
1434 if (ata_id_current_chs_valid(id
)) {
1435 /* Current CHS translation is valid. */
1436 dev
->cylinders
= id
[54];
1437 dev
->heads
= id
[55];
1438 dev
->sectors
= id
[56];
1441 /* print device info to dmesg */
1442 if (ata_msg_drv(ap
) && print_info
)
1443 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1444 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1445 ata_id_major_version(id
),
1446 ata_mode_string(xfer_mask
),
1447 (unsigned long long)dev
->n_sectors
,
1448 dev
->cylinders
, dev
->heads
,
1452 if (dev
->id
[59] & 0x100) {
1453 dev
->multi_count
= dev
->id
[59] & 0xff;
1454 if (ata_msg_drv(ap
) && print_info
)
1455 ata_dev_printk(dev
, KERN_INFO
,
1456 "ata%u: dev %u multi count %u\n",
1457 ap
->id
, dev
->devno
, dev
->multi_count
);
1463 /* ATAPI-specific feature tests */
1464 else if (dev
->class == ATA_DEV_ATAPI
) {
1465 char *cdb_intr_string
= "";
1467 rc
= atapi_cdb_len(id
);
1468 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1469 if (ata_msg_warn(ap
))
1470 ata_dev_printk(dev
, KERN_WARNING
,
1471 "unsupported CDB len\n");
1475 dev
->cdb_len
= (unsigned int) rc
;
1477 if (ata_id_cdb_intr(dev
->id
)) {
1478 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1479 cdb_intr_string
= ", CDB intr";
1482 /* print device info to dmesg */
1483 if (ata_msg_drv(ap
) && print_info
)
1484 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s%s\n",
1485 ata_mode_string(xfer_mask
),
1489 ata_set_port_max_cmd_len(ap
);
1491 /* limit bridge transfers to udma5, 200 sectors */
1492 if (ata_dev_knobble(dev
)) {
1493 if (ata_msg_drv(ap
) && print_info
)
1494 ata_dev_printk(dev
, KERN_INFO
,
1495 "applying bridge limits\n");
1496 dev
->udma_mask
&= ATA_UDMA5
;
1497 dev
->max_sectors
= ATA_MAX_SECTORS
;
1500 if (ap
->ops
->dev_config
)
1501 ap
->ops
->dev_config(ap
, dev
);
1503 if (ata_msg_probe(ap
))
1504 ata_dev_printk(dev
, KERN_DEBUG
, "%s: EXIT, drv_stat = 0x%x\n",
1505 __FUNCTION__
, ata_chk_status(ap
));
1509 if (ata_msg_probe(ap
))
1510 ata_dev_printk(dev
, KERN_DEBUG
,
1511 "%s: EXIT, err\n", __FUNCTION__
);
1516 * ata_bus_probe - Reset and probe ATA bus
1519 * Master ATA bus probing function. Initiates a hardware-dependent
1520 * bus reset, then attempts to identify any devices found on
1524 * PCI/etc. bus probe sem.
1527 * Zero on success, negative errno otherwise.
1530 int ata_bus_probe(struct ata_port
*ap
)
1532 unsigned int classes
[ATA_MAX_DEVICES
];
1533 int tries
[ATA_MAX_DEVICES
];
1534 int i
, rc
, down_xfermask
;
1535 struct ata_device
*dev
;
1539 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1540 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1545 /* reset and determine device classes */
1546 ap
->ops
->phy_reset(ap
);
1548 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1549 dev
= &ap
->device
[i
];
1551 if (!(ap
->flags
& ATA_FLAG_DISABLED
) &&
1552 dev
->class != ATA_DEV_UNKNOWN
)
1553 classes
[dev
->devno
] = dev
->class;
1555 classes
[dev
->devno
] = ATA_DEV_NONE
;
1557 dev
->class = ATA_DEV_UNKNOWN
;
1562 /* after the reset the device state is PIO 0 and the controller
1563 state is undefined. Record the mode */
1565 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1566 ap
->device
[i
].pio_mode
= XFER_PIO_0
;
1568 /* read IDENTIFY page and configure devices */
1569 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1570 dev
= &ap
->device
[i
];
1573 dev
->class = classes
[i
];
1575 if (!ata_dev_enabled(dev
))
1578 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1582 rc
= ata_dev_configure(dev
, 1);
1587 /* configure transfer mode */
1588 rc
= ata_set_mode(ap
, &dev
);
1594 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1595 if (ata_dev_enabled(&ap
->device
[i
]))
1598 /* no device present, disable port */
1599 ata_port_disable(ap
);
1600 ap
->ops
->port_disable(ap
);
1607 tries
[dev
->devno
] = 0;
1610 sata_down_spd_limit(ap
);
1613 tries
[dev
->devno
]--;
1614 if (down_xfermask
&&
1615 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1616 tries
[dev
->devno
] = 0;
1619 if (!tries
[dev
->devno
]) {
1620 ata_down_xfermask_limit(dev
, 1);
1621 ata_dev_disable(dev
);
1628 * ata_port_probe - Mark port as enabled
1629 * @ap: Port for which we indicate enablement
1631 * Modify @ap data structure such that the system
1632 * thinks that the entire port is enabled.
1634 * LOCKING: host_set lock, or some other form of
1638 void ata_port_probe(struct ata_port
*ap
)
1640 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1644 * sata_print_link_status - Print SATA link status
1645 * @ap: SATA port to printk link status about
1647 * This function prints link speed and status of a SATA link.
1652 static void sata_print_link_status(struct ata_port
*ap
)
1654 u32 sstatus
, scontrol
, tmp
;
1656 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1658 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1660 if (ata_port_online(ap
)) {
1661 tmp
= (sstatus
>> 4) & 0xf;
1662 ata_port_printk(ap
, KERN_INFO
,
1663 "SATA link up %s (SStatus %X SControl %X)\n",
1664 sata_spd_string(tmp
), sstatus
, scontrol
);
1666 ata_port_printk(ap
, KERN_INFO
,
1667 "SATA link down (SStatus %X SControl %X)\n",
1673 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1674 * @ap: SATA port associated with target SATA PHY.
1676 * This function issues commands to standard SATA Sxxx
1677 * PHY registers, to wake up the phy (and device), and
1678 * clear any reset condition.
1681 * PCI/etc. bus probe sem.
1684 void __sata_phy_reset(struct ata_port
*ap
)
1687 unsigned long timeout
= jiffies
+ (HZ
* 5);
1689 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1690 /* issue phy wake/reset */
1691 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1692 /* Couldn't find anything in SATA I/II specs, but
1693 * AHCI-1.1 10.4.2 says at least 1 ms. */
1696 /* phy wake/clear reset */
1697 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1699 /* wait for phy to become ready, if necessary */
1702 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1703 if ((sstatus
& 0xf) != 1)
1705 } while (time_before(jiffies
, timeout
));
1707 /* print link status */
1708 sata_print_link_status(ap
);
1710 /* TODO: phy layer with polling, timeouts, etc. */
1711 if (!ata_port_offline(ap
))
1714 ata_port_disable(ap
);
1716 if (ap
->flags
& ATA_FLAG_DISABLED
)
1719 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1720 ata_port_disable(ap
);
1724 ap
->cbl
= ATA_CBL_SATA
;
1728 * sata_phy_reset - Reset SATA bus.
1729 * @ap: SATA port associated with target SATA PHY.
1731 * This function resets the SATA bus, and then probes
1732 * the bus for devices.
1735 * PCI/etc. bus probe sem.
1738 void sata_phy_reset(struct ata_port
*ap
)
1740 __sata_phy_reset(ap
);
1741 if (ap
->flags
& ATA_FLAG_DISABLED
)
1747 * ata_dev_pair - return other device on cable
1750 * Obtain the other device on the same cable, or if none is
1751 * present NULL is returned
1754 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1756 struct ata_port
*ap
= adev
->ap
;
1757 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1758 if (!ata_dev_enabled(pair
))
1764 * ata_port_disable - Disable port.
1765 * @ap: Port to be disabled.
1767 * Modify @ap data structure such that the system
1768 * thinks that the entire port is disabled, and should
1769 * never attempt to probe or communicate with devices
1772 * LOCKING: host_set lock, or some other form of
1776 void ata_port_disable(struct ata_port
*ap
)
1778 ap
->device
[0].class = ATA_DEV_NONE
;
1779 ap
->device
[1].class = ATA_DEV_NONE
;
1780 ap
->flags
|= ATA_FLAG_DISABLED
;
1784 * sata_down_spd_limit - adjust SATA spd limit downward
1785 * @ap: Port to adjust SATA spd limit for
1787 * Adjust SATA spd limit of @ap downward. Note that this
1788 * function only adjusts the limit. The change must be applied
1789 * using sata_set_spd().
1792 * Inherited from caller.
1795 * 0 on success, negative errno on failure
1797 int sata_down_spd_limit(struct ata_port
*ap
)
1799 u32 sstatus
, spd
, mask
;
1802 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1806 mask
= ap
->sata_spd_limit
;
1809 highbit
= fls(mask
) - 1;
1810 mask
&= ~(1 << highbit
);
1812 spd
= (sstatus
>> 4) & 0xf;
1816 mask
&= (1 << spd
) - 1;
1820 ap
->sata_spd_limit
= mask
;
1822 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1823 sata_spd_string(fls(mask
)));
1828 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1832 if (ap
->sata_spd_limit
== UINT_MAX
)
1835 limit
= fls(ap
->sata_spd_limit
);
1837 spd
= (*scontrol
>> 4) & 0xf;
1838 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1840 return spd
!= limit
;
1844 * sata_set_spd_needed - is SATA spd configuration needed
1845 * @ap: Port in question
1847 * Test whether the spd limit in SControl matches
1848 * @ap->sata_spd_limit. This function is used to determine
1849 * whether hardreset is necessary to apply SATA spd
1853 * Inherited from caller.
1856 * 1 if SATA spd configuration is needed, 0 otherwise.
1858 int sata_set_spd_needed(struct ata_port
*ap
)
1862 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1865 return __sata_set_spd_needed(ap
, &scontrol
);
1869 * sata_set_spd - set SATA spd according to spd limit
1870 * @ap: Port to set SATA spd for
1872 * Set SATA spd of @ap according to sata_spd_limit.
1875 * Inherited from caller.
1878 * 0 if spd doesn't need to be changed, 1 if spd has been
1879 * changed. Negative errno if SCR registers are inaccessible.
1881 int sata_set_spd(struct ata_port
*ap
)
1886 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1889 if (!__sata_set_spd_needed(ap
, &scontrol
))
1892 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1899 * This mode timing computation functionality is ported over from
1900 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1903 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1904 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1905 * for PIO 5, which is a nonstandard extension and UDMA6, which
1906 * is currently supported only by Maxtor drives.
1909 static const struct ata_timing ata_timing
[] = {
1911 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1912 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1913 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1914 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1916 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1917 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1918 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1920 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1922 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1923 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1924 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1926 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1927 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1928 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1930 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1931 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1932 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1934 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1935 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1936 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1938 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1943 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1944 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1946 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1948 q
->setup
= EZ(t
->setup
* 1000, T
);
1949 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1950 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1951 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1952 q
->active
= EZ(t
->active
* 1000, T
);
1953 q
->recover
= EZ(t
->recover
* 1000, T
);
1954 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1955 q
->udma
= EZ(t
->udma
* 1000, UT
);
1958 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1959 struct ata_timing
*m
, unsigned int what
)
1961 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1962 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1963 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1964 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1965 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1966 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1967 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1968 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1971 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1973 const struct ata_timing
*t
;
1975 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1976 if (t
->mode
== 0xFF)
1981 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1982 struct ata_timing
*t
, int T
, int UT
)
1984 const struct ata_timing
*s
;
1985 struct ata_timing p
;
1991 if (!(s
= ata_timing_find_mode(speed
)))
1994 memcpy(t
, s
, sizeof(*s
));
1997 * If the drive is an EIDE drive, it can tell us it needs extended
1998 * PIO/MW_DMA cycle timing.
2001 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
2002 memset(&p
, 0, sizeof(p
));
2003 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
2004 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
2005 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
2006 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
2007 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
2009 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
2013 * Convert the timing to bus clock counts.
2016 ata_timing_quantize(t
, t
, T
, UT
);
2019 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
2020 * S.M.A.R.T * and some other commands. We have to ensure that the
2021 * DMA cycle timing is slower/equal than the fastest PIO timing.
2024 if (speed
> XFER_PIO_4
) {
2025 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
2026 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
2030 * Lengthen active & recovery time so that cycle time is correct.
2033 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
2034 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
2035 t
->rec8b
= t
->cyc8b
- t
->act8b
;
2038 if (t
->active
+ t
->recover
< t
->cycle
) {
2039 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
2040 t
->recover
= t
->cycle
- t
->active
;
2047 * ata_down_xfermask_limit - adjust dev xfer masks downward
2048 * @dev: Device to adjust xfer masks
2049 * @force_pio0: Force PIO0
2051 * Adjust xfer masks of @dev downward. Note that this function
2052 * does not apply the change. Invoking ata_set_mode() afterwards
2053 * will apply the limit.
2056 * Inherited from caller.
2059 * 0 on success, negative errno on failure
2061 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
2063 unsigned long xfer_mask
;
2066 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
2071 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2072 if (xfer_mask
& ATA_MASK_UDMA
)
2073 xfer_mask
&= ~ATA_MASK_MWDMA
;
2075 highbit
= fls(xfer_mask
) - 1;
2076 xfer_mask
&= ~(1 << highbit
);
2078 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
2082 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2085 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
2086 ata_mode_string(xfer_mask
));
2094 static int ata_dev_set_mode(struct ata_device
*dev
)
2096 unsigned int err_mask
;
2099 dev
->flags
&= ~ATA_DFLAG_PIO
;
2100 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
2101 dev
->flags
|= ATA_DFLAG_PIO
;
2103 err_mask
= ata_dev_set_xfermode(dev
);
2105 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
2106 "(err_mask=0x%x)\n", err_mask
);
2110 rc
= ata_dev_revalidate(dev
, 0);
2114 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2115 dev
->xfer_shift
, (int)dev
->xfer_mode
);
2117 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
2118 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
2123 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2124 * @ap: port on which timings will be programmed
2125 * @r_failed_dev: out paramter for failed device
2127 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2128 * ata_set_mode() fails, pointer to the failing device is
2129 * returned in @r_failed_dev.
2132 * PCI/etc. bus probe sem.
2135 * 0 on success, negative errno otherwise
2137 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2139 struct ata_device
*dev
;
2140 int i
, rc
= 0, used_dma
= 0, found
= 0;
2142 /* has private set_mode? */
2143 if (ap
->ops
->set_mode
) {
2144 /* FIXME: make ->set_mode handle no device case and
2145 * return error code and failing device on failure.
2147 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2148 if (ata_dev_ready(&ap
->device
[i
])) {
2149 ap
->ops
->set_mode(ap
);
2156 /* step 1: calculate xfer_mask */
2157 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2158 unsigned int pio_mask
, dma_mask
;
2160 dev
= &ap
->device
[i
];
2162 if (!ata_dev_enabled(dev
))
2165 ata_dev_xfermask(dev
);
2167 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2168 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2169 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2170 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2179 /* step 2: always set host PIO timings */
2180 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2181 dev
= &ap
->device
[i
];
2182 if (!ata_dev_enabled(dev
))
2185 if (!dev
->pio_mode
) {
2186 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2191 dev
->xfer_mode
= dev
->pio_mode
;
2192 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2193 if (ap
->ops
->set_piomode
)
2194 ap
->ops
->set_piomode(ap
, dev
);
2197 /* step 3: set host DMA timings */
2198 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2199 dev
= &ap
->device
[i
];
2201 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2204 dev
->xfer_mode
= dev
->dma_mode
;
2205 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2206 if (ap
->ops
->set_dmamode
)
2207 ap
->ops
->set_dmamode(ap
, dev
);
2210 /* step 4: update devices' xfer mode */
2211 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2212 dev
= &ap
->device
[i
];
2214 /* don't udpate suspended devices' xfer mode */
2215 if (!ata_dev_ready(dev
))
2218 rc
= ata_dev_set_mode(dev
);
2223 /* Record simplex status. If we selected DMA then the other
2224 * host channels are not permitted to do so.
2226 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2227 ap
->host_set
->simplex_claimed
= 1;
2229 /* step5: chip specific finalisation */
2230 if (ap
->ops
->post_set_mode
)
2231 ap
->ops
->post_set_mode(ap
);
2235 *r_failed_dev
= dev
;
2240 * ata_tf_to_host - issue ATA taskfile to host controller
2241 * @ap: port to which command is being issued
2242 * @tf: ATA taskfile register set
2244 * Issues ATA taskfile register set to ATA host controller,
2245 * with proper synchronization with interrupt handler and
2249 * spin_lock_irqsave(host_set lock)
2252 static inline void ata_tf_to_host(struct ata_port
*ap
,
2253 const struct ata_taskfile
*tf
)
2255 ap
->ops
->tf_load(ap
, tf
);
2256 ap
->ops
->exec_command(ap
, tf
);
2260 * ata_busy_sleep - sleep until BSY clears, or timeout
2261 * @ap: port containing status register to be polled
2262 * @tmout_pat: impatience timeout
2263 * @tmout: overall timeout
2265 * Sleep until ATA Status register bit BSY clears,
2266 * or a timeout occurs.
2271 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2272 unsigned long tmout_pat
, unsigned long tmout
)
2274 unsigned long timer_start
, timeout
;
2277 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2278 timer_start
= jiffies
;
2279 timeout
= timer_start
+ tmout_pat
;
2280 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2282 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2285 if (status
& ATA_BUSY
)
2286 ata_port_printk(ap
, KERN_WARNING
,
2287 "port is slow to respond, please be patient\n");
2289 timeout
= timer_start
+ tmout
;
2290 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2292 status
= ata_chk_status(ap
);
2295 if (status
& ATA_BUSY
) {
2296 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2297 "(%lu secs)\n", tmout
/ HZ
);
2304 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2306 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2307 unsigned int dev0
= devmask
& (1 << 0);
2308 unsigned int dev1
= devmask
& (1 << 1);
2309 unsigned long timeout
;
2311 /* if device 0 was found in ata_devchk, wait for its
2315 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2317 /* if device 1 was found in ata_devchk, wait for
2318 * register access, then wait for BSY to clear
2320 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2324 ap
->ops
->dev_select(ap
, 1);
2325 if (ap
->flags
& ATA_FLAG_MMIO
) {
2326 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2327 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2329 nsect
= inb(ioaddr
->nsect_addr
);
2330 lbal
= inb(ioaddr
->lbal_addr
);
2332 if ((nsect
== 1) && (lbal
== 1))
2334 if (time_after(jiffies
, timeout
)) {
2338 msleep(50); /* give drive a breather */
2341 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2343 /* is all this really necessary? */
2344 ap
->ops
->dev_select(ap
, 0);
2346 ap
->ops
->dev_select(ap
, 1);
2348 ap
->ops
->dev_select(ap
, 0);
2351 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2352 unsigned int devmask
)
2354 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2356 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2358 /* software reset. causes dev0 to be selected */
2359 if (ap
->flags
& ATA_FLAG_MMIO
) {
2360 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2361 udelay(20); /* FIXME: flush */
2362 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2363 udelay(20); /* FIXME: flush */
2364 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2366 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2368 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2370 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2373 /* spec mandates ">= 2ms" before checking status.
2374 * We wait 150ms, because that was the magic delay used for
2375 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2376 * between when the ATA command register is written, and then
2377 * status is checked. Because waiting for "a while" before
2378 * checking status is fine, post SRST, we perform this magic
2379 * delay here as well.
2381 * Old drivers/ide uses the 2mS rule and then waits for ready
2385 /* Before we perform post reset processing we want to see if
2386 * the bus shows 0xFF because the odd clown forgets the D7
2387 * pulldown resistor.
2389 if (ata_check_status(ap
) == 0xFF) {
2390 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2391 return AC_ERR_OTHER
;
2394 ata_bus_post_reset(ap
, devmask
);
2400 * ata_bus_reset - reset host port and associated ATA channel
2401 * @ap: port to reset
2403 * This is typically the first time we actually start issuing
2404 * commands to the ATA channel. We wait for BSY to clear, then
2405 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2406 * result. Determine what devices, if any, are on the channel
2407 * by looking at the device 0/1 error register. Look at the signature
2408 * stored in each device's taskfile registers, to determine if
2409 * the device is ATA or ATAPI.
2412 * PCI/etc. bus probe sem.
2413 * Obtains host_set lock.
2416 * Sets ATA_FLAG_DISABLED if bus reset fails.
2419 void ata_bus_reset(struct ata_port
*ap
)
2421 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2422 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2424 unsigned int dev0
, dev1
= 0, devmask
= 0;
2426 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2428 /* determine if device 0/1 are present */
2429 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2432 dev0
= ata_devchk(ap
, 0);
2434 dev1
= ata_devchk(ap
, 1);
2438 devmask
|= (1 << 0);
2440 devmask
|= (1 << 1);
2442 /* select device 0 again */
2443 ap
->ops
->dev_select(ap
, 0);
2445 /* issue bus reset */
2446 if (ap
->flags
& ATA_FLAG_SRST
)
2447 if (ata_bus_softreset(ap
, devmask
))
2451 * determine by signature whether we have ATA or ATAPI devices
2453 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2454 if ((slave_possible
) && (err
!= 0x81))
2455 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2457 /* re-enable interrupts */
2458 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2461 /* is double-select really necessary? */
2462 if (ap
->device
[1].class != ATA_DEV_NONE
)
2463 ap
->ops
->dev_select(ap
, 1);
2464 if (ap
->device
[0].class != ATA_DEV_NONE
)
2465 ap
->ops
->dev_select(ap
, 0);
2467 /* if no devices were detected, disable this port */
2468 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2469 (ap
->device
[1].class == ATA_DEV_NONE
))
2472 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2473 /* set up device control for ATA_FLAG_SATA_RESET */
2474 if (ap
->flags
& ATA_FLAG_MMIO
)
2475 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2477 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2484 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2485 ap
->ops
->port_disable(ap
);
2491 * sata_phy_debounce - debounce SATA phy status
2492 * @ap: ATA port to debounce SATA phy status for
2493 * @params: timing parameters { interval, duratinon, timeout } in msec
2495 * Make sure SStatus of @ap reaches stable state, determined by
2496 * holding the same value where DET is not 1 for @duration polled
2497 * every @interval, before @timeout. Timeout constraints the
2498 * beginning of the stable state. Because, after hot unplugging,
2499 * DET gets stuck at 1 on some controllers, this functions waits
2500 * until timeout then returns 0 if DET is stable at 1.
2503 * Kernel thread context (may sleep)
2506 * 0 on success, -errno on failure.
2508 int sata_phy_debounce(struct ata_port
*ap
, const unsigned long *params
)
2510 unsigned long interval_msec
= params
[0];
2511 unsigned long duration
= params
[1] * HZ
/ 1000;
2512 unsigned long timeout
= jiffies
+ params
[2] * HZ
/ 1000;
2513 unsigned long last_jiffies
;
2517 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2522 last_jiffies
= jiffies
;
2525 msleep(interval_msec
);
2526 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2532 if (cur
== 1 && time_before(jiffies
, timeout
))
2534 if (time_after(jiffies
, last_jiffies
+ duration
))
2539 /* unstable, start over */
2541 last_jiffies
= jiffies
;
2544 if (time_after(jiffies
, timeout
))
2550 * sata_phy_resume - resume SATA phy
2551 * @ap: ATA port to resume SATA phy for
2552 * @params: timing parameters { interval, duratinon, timeout } in msec
2554 * Resume SATA phy of @ap and debounce it.
2557 * Kernel thread context (may sleep)
2560 * 0 on success, -errno on failure.
2562 int sata_phy_resume(struct ata_port
*ap
, const unsigned long *params
)
2567 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2570 scontrol
= (scontrol
& 0x0f0) | 0x300;
2572 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2575 /* Some PHYs react badly if SStatus is pounded immediately
2576 * after resuming. Delay 200ms before debouncing.
2580 return sata_phy_debounce(ap
, params
);
2583 static void ata_wait_spinup(struct ata_port
*ap
)
2585 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2586 unsigned long end
, secs
;
2589 /* first, debounce phy if SATA */
2590 if (ap
->cbl
== ATA_CBL_SATA
) {
2591 rc
= sata_phy_debounce(ap
, sata_deb_timing_hotplug
);
2593 /* if debounced successfully and offline, no need to wait */
2594 if ((rc
== 0 || rc
== -EOPNOTSUPP
) && ata_port_offline(ap
))
2598 /* okay, let's give the drive time to spin up */
2599 end
= ehc
->i
.hotplug_timestamp
+ ATA_SPINUP_WAIT
* HZ
/ 1000;
2600 secs
= ((end
- jiffies
) + HZ
- 1) / HZ
;
2602 if (time_after(jiffies
, end
))
2606 ata_port_printk(ap
, KERN_INFO
, "waiting for device to spin up "
2607 "(%lu secs)\n", secs
);
2609 schedule_timeout_uninterruptible(end
- jiffies
);
2613 * ata_std_prereset - prepare for reset
2614 * @ap: ATA port to be reset
2616 * @ap is about to be reset. Initialize it.
2619 * Kernel thread context (may sleep)
2622 * 0 on success, -errno otherwise.
2624 int ata_std_prereset(struct ata_port
*ap
)
2626 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2627 const unsigned long *timing
= sata_ehc_deb_timing(ehc
);
2630 /* handle link resume & hotplug spinup */
2631 if ((ehc
->i
.flags
& ATA_EHI_RESUME_LINK
) &&
2632 (ap
->flags
& ATA_FLAG_HRST_TO_RESUME
))
2633 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2635 if ((ehc
->i
.flags
& ATA_EHI_HOTPLUGGED
) &&
2636 (ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
))
2637 ata_wait_spinup(ap
);
2639 /* if we're about to do hardreset, nothing more to do */
2640 if (ehc
->i
.action
& ATA_EH_HARDRESET
)
2643 /* if SATA, resume phy */
2644 if (ap
->cbl
== ATA_CBL_SATA
) {
2645 rc
= sata_phy_resume(ap
, timing
);
2646 if (rc
&& rc
!= -EOPNOTSUPP
) {
2647 /* phy resume failed */
2648 ata_port_printk(ap
, KERN_WARNING
, "failed to resume "
2649 "link for reset (errno=%d)\n", rc
);
2654 /* Wait for !BSY if the controller can wait for the first D2H
2655 * Reg FIS and we don't know that no device is attached.
2657 if (!(ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
) && !ata_port_offline(ap
))
2658 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2664 * ata_std_softreset - reset host port via ATA SRST
2665 * @ap: port to reset
2666 * @classes: resulting classes of attached devices
2668 * Reset host port using ATA SRST.
2671 * Kernel thread context (may sleep)
2674 * 0 on success, -errno otherwise.
2676 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2678 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2679 unsigned int devmask
= 0, err_mask
;
2684 if (ata_port_offline(ap
)) {
2685 classes
[0] = ATA_DEV_NONE
;
2689 /* determine if device 0/1 are present */
2690 if (ata_devchk(ap
, 0))
2691 devmask
|= (1 << 0);
2692 if (slave_possible
&& ata_devchk(ap
, 1))
2693 devmask
|= (1 << 1);
2695 /* select device 0 again */
2696 ap
->ops
->dev_select(ap
, 0);
2698 /* issue bus reset */
2699 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2700 err_mask
= ata_bus_softreset(ap
, devmask
);
2702 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2707 /* determine by signature whether we have ATA or ATAPI devices */
2708 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2709 if (slave_possible
&& err
!= 0x81)
2710 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2713 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2718 * sata_std_hardreset - reset host port via SATA phy reset
2719 * @ap: port to reset
2720 * @class: resulting class of attached device
2722 * SATA phy-reset host port using DET bits of SControl register.
2725 * Kernel thread context (may sleep)
2728 * 0 on success, -errno otherwise.
2730 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2732 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2733 const unsigned long *timing
= sata_ehc_deb_timing(ehc
);
2739 if (sata_set_spd_needed(ap
)) {
2740 /* SATA spec says nothing about how to reconfigure
2741 * spd. To be on the safe side, turn off phy during
2742 * reconfiguration. This works for at least ICH7 AHCI
2745 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2748 scontrol
= (scontrol
& 0x0f0) | 0x302;
2750 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2756 /* issue phy wake/reset */
2757 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2760 scontrol
= (scontrol
& 0x0f0) | 0x301;
2762 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2765 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2766 * 10.4.2 says at least 1 ms.
2770 /* bring phy back */
2771 sata_phy_resume(ap
, timing
);
2773 /* TODO: phy layer with polling, timeouts, etc. */
2774 if (ata_port_offline(ap
)) {
2775 *class = ATA_DEV_NONE
;
2776 DPRINTK("EXIT, link offline\n");
2780 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2781 ata_port_printk(ap
, KERN_ERR
,
2782 "COMRESET failed (device not ready)\n");
2786 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2788 *class = ata_dev_try_classify(ap
, 0, NULL
);
2790 DPRINTK("EXIT, class=%u\n", *class);
2795 * ata_std_postreset - standard postreset callback
2796 * @ap: the target ata_port
2797 * @classes: classes of attached devices
2799 * This function is invoked after a successful reset. Note that
2800 * the device might have been reset more than once using
2801 * different reset methods before postreset is invoked.
2804 * Kernel thread context (may sleep)
2806 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2812 /* print link status */
2813 sata_print_link_status(ap
);
2816 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2817 sata_scr_write(ap
, SCR_ERROR
, serror
);
2819 /* re-enable interrupts */
2820 if (!ap
->ops
->error_handler
) {
2821 /* FIXME: hack. create a hook instead */
2822 if (ap
->ioaddr
.ctl_addr
)
2826 /* is double-select really necessary? */
2827 if (classes
[0] != ATA_DEV_NONE
)
2828 ap
->ops
->dev_select(ap
, 1);
2829 if (classes
[1] != ATA_DEV_NONE
)
2830 ap
->ops
->dev_select(ap
, 0);
2832 /* bail out if no device is present */
2833 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2834 DPRINTK("EXIT, no device\n");
2838 /* set up device control */
2839 if (ap
->ioaddr
.ctl_addr
) {
2840 if (ap
->flags
& ATA_FLAG_MMIO
)
2841 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2843 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2850 * ata_dev_same_device - Determine whether new ID matches configured device
2851 * @dev: device to compare against
2852 * @new_class: class of the new device
2853 * @new_id: IDENTIFY page of the new device
2855 * Compare @new_class and @new_id against @dev and determine
2856 * whether @dev is the device indicated by @new_class and
2863 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2865 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2868 const u16
*old_id
= dev
->id
;
2869 unsigned char model
[2][41], serial
[2][21];
2872 if (dev
->class != new_class
) {
2873 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2874 dev
->class, new_class
);
2878 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2879 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2880 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2881 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2882 new_n_sectors
= ata_id_n_sectors(new_id
);
2884 if (strcmp(model
[0], model
[1])) {
2885 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2886 "'%s' != '%s'\n", model
[0], model
[1]);
2890 if (strcmp(serial
[0], serial
[1])) {
2891 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2892 "'%s' != '%s'\n", serial
[0], serial
[1]);
2896 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2897 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2899 (unsigned long long)dev
->n_sectors
,
2900 (unsigned long long)new_n_sectors
);
2908 * ata_dev_revalidate - Revalidate ATA device
2909 * @dev: device to revalidate
2910 * @post_reset: is this revalidation after reset?
2912 * Re-read IDENTIFY page and make sure @dev is still attached to
2916 * Kernel thread context (may sleep)
2919 * 0 on success, negative errno otherwise
2921 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2923 unsigned int class = dev
->class;
2924 u16
*id
= (void *)dev
->ap
->sector_buf
;
2927 if (!ata_dev_enabled(dev
)) {
2933 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2937 /* is the device still there? */
2938 if (!ata_dev_same_device(dev
, class, id
)) {
2943 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2945 /* configure device according to the new ID */
2946 rc
= ata_dev_configure(dev
, 0);
2951 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
2955 static const char * const ata_dma_blacklist
[] = {
2956 "WDC AC11000H", NULL
,
2957 "WDC AC22100H", NULL
,
2958 "WDC AC32500H", NULL
,
2959 "WDC AC33100H", NULL
,
2960 "WDC AC31600H", NULL
,
2961 "WDC AC32100H", "24.09P07",
2962 "WDC AC23200L", "21.10N21",
2963 "Compaq CRD-8241B", NULL
,
2968 "SanDisk SDP3B", NULL
,
2969 "SanDisk SDP3B-64", NULL
,
2970 "SANYO CD-ROM CRD", NULL
,
2971 "HITACHI CDR-8", NULL
,
2972 "HITACHI CDR-8335", NULL
,
2973 "HITACHI CDR-8435", NULL
,
2974 "Toshiba CD-ROM XM-6202B", NULL
,
2975 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2977 "E-IDE CD-ROM CR-840", NULL
,
2978 "CD-ROM Drive/F5A", NULL
,
2979 "WPI CDD-820", NULL
,
2980 "SAMSUNG CD-ROM SC-148C", NULL
,
2981 "SAMSUNG CD-ROM SC", NULL
,
2982 "SanDisk SDP3B-64", NULL
,
2983 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2984 "_NEC DV5800A", NULL
,
2985 "SAMSUNG CD-ROM SN-124", "N001"
2988 static int ata_strim(char *s
, size_t len
)
2990 len
= strnlen(s
, len
);
2992 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2993 while ((len
> 0) && (s
[len
- 1] == ' ')) {
3000 static int ata_dma_blacklisted(const struct ata_device
*dev
)
3002 unsigned char model_num
[40];
3003 unsigned char model_rev
[16];
3004 unsigned int nlen
, rlen
;
3007 /* We don't support polling DMA.
3008 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
3009 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
3011 if ((dev
->ap
->flags
& ATA_FLAG_PIO_POLLING
) &&
3012 (dev
->flags
& ATA_DFLAG_CDB_INTR
))
3015 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
3017 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
3019 nlen
= ata_strim(model_num
, sizeof(model_num
));
3020 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
3022 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
3023 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
3024 if (ata_dma_blacklist
[i
+1] == NULL
)
3026 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
3034 * ata_dev_xfermask - Compute supported xfermask of the given device
3035 * @dev: Device to compute xfermask for
3037 * Compute supported xfermask of @dev and store it in
3038 * dev->*_mask. This function is responsible for applying all
3039 * known limits including host controller limits, device
3045 static void ata_dev_xfermask(struct ata_device
*dev
)
3047 struct ata_port
*ap
= dev
->ap
;
3048 struct ata_host_set
*hs
= ap
->host_set
;
3049 unsigned long xfer_mask
;
3051 /* controller modes available */
3052 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
3053 ap
->mwdma_mask
, ap
->udma_mask
);
3055 /* Apply cable rule here. Don't apply it early because when
3056 * we handle hot plug the cable type can itself change.
3058 if (ap
->cbl
== ATA_CBL_PATA40
)
3059 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
3061 xfer_mask
&= ata_pack_xfermask(dev
->pio_mask
,
3062 dev
->mwdma_mask
, dev
->udma_mask
);
3063 xfer_mask
&= ata_id_xfermask(dev
->id
);
3065 if (ata_dma_blacklisted(dev
)) {
3066 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3067 ata_dev_printk(dev
, KERN_WARNING
,
3068 "device is on DMA blacklist, disabling DMA\n");
3071 if ((hs
->flags
& ATA_HOST_SIMPLEX
) && hs
->simplex_claimed
) {
3072 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3073 ata_dev_printk(dev
, KERN_WARNING
, "simplex DMA is claimed by "
3074 "other device, disabling DMA\n");
3077 if (ap
->ops
->mode_filter
)
3078 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
3080 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
3081 &dev
->mwdma_mask
, &dev
->udma_mask
);
3085 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3086 * @dev: Device to which command will be sent
3088 * Issue SET FEATURES - XFER MODE command to device @dev
3092 * PCI/etc. bus probe sem.
3095 * 0 on success, AC_ERR_* mask otherwise.
3098 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3100 struct ata_taskfile tf
;
3101 unsigned int err_mask
;
3103 /* set up set-features taskfile */
3104 DPRINTK("set features - xfer mode\n");
3106 ata_tf_init(dev
, &tf
);
3107 tf
.command
= ATA_CMD_SET_FEATURES
;
3108 tf
.feature
= SETFEATURES_XFER
;
3109 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3110 tf
.protocol
= ATA_PROT_NODATA
;
3111 tf
.nsect
= dev
->xfer_mode
;
3113 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3115 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3120 * ata_dev_init_params - Issue INIT DEV PARAMS command
3121 * @dev: Device to which command will be sent
3122 * @heads: Number of heads (taskfile parameter)
3123 * @sectors: Number of sectors (taskfile parameter)
3126 * Kernel thread context (may sleep)
3129 * 0 on success, AC_ERR_* mask otherwise.
3131 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3132 u16 heads
, u16 sectors
)
3134 struct ata_taskfile tf
;
3135 unsigned int err_mask
;
3137 /* Number of sectors per track 1-255. Number of heads 1-16 */
3138 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3139 return AC_ERR_INVALID
;
3141 /* set up init dev params taskfile */
3142 DPRINTK("init dev params \n");
3144 ata_tf_init(dev
, &tf
);
3145 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3146 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3147 tf
.protocol
= ATA_PROT_NODATA
;
3149 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3151 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3153 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3158 * ata_sg_clean - Unmap DMA memory associated with command
3159 * @qc: Command containing DMA memory to be released
3161 * Unmap all mapped DMA memory associated with this command.
3164 * spin_lock_irqsave(host_set lock)
3167 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3169 struct ata_port
*ap
= qc
->ap
;
3170 struct scatterlist
*sg
= qc
->__sg
;
3171 int dir
= qc
->dma_dir
;
3172 void *pad_buf
= NULL
;
3174 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3175 WARN_ON(sg
== NULL
);
3177 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3178 WARN_ON(qc
->n_elem
> 1);
3180 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3182 /* if we padded the buffer out to 32-bit bound, and data
3183 * xfer direction is from-device, we must copy from the
3184 * pad buffer back into the supplied buffer
3186 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3187 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3189 if (qc
->flags
& ATA_QCFLAG_SG
) {
3191 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3192 /* restore last sg */
3193 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3195 struct scatterlist
*psg
= &qc
->pad_sgent
;
3196 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3197 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3198 kunmap_atomic(addr
, KM_IRQ0
);
3202 dma_unmap_single(ap
->dev
,
3203 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3206 sg
->length
+= qc
->pad_len
;
3208 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3209 pad_buf
, qc
->pad_len
);
3212 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3217 * ata_fill_sg - Fill PCI IDE PRD table
3218 * @qc: Metadata associated with taskfile to be transferred
3220 * Fill PCI IDE PRD (scatter-gather) table with segments
3221 * associated with the current disk command.
3224 * spin_lock_irqsave(host_set lock)
3227 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3229 struct ata_port
*ap
= qc
->ap
;
3230 struct scatterlist
*sg
;
3233 WARN_ON(qc
->__sg
== NULL
);
3234 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3237 ata_for_each_sg(sg
, qc
) {
3241 /* determine if physical DMA addr spans 64K boundary.
3242 * Note h/w doesn't support 64-bit, so we unconditionally
3243 * truncate dma_addr_t to u32.
3245 addr
= (u32
) sg_dma_address(sg
);
3246 sg_len
= sg_dma_len(sg
);
3249 offset
= addr
& 0xffff;
3251 if ((offset
+ sg_len
) > 0x10000)
3252 len
= 0x10000 - offset
;
3254 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3255 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3256 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3265 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3268 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3269 * @qc: Metadata associated with taskfile to check
3271 * Allow low-level driver to filter ATA PACKET commands, returning
3272 * a status indicating whether or not it is OK to use DMA for the
3273 * supplied PACKET command.
3276 * spin_lock_irqsave(host_set lock)
3278 * RETURNS: 0 when ATAPI DMA can be used
3281 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3283 struct ata_port
*ap
= qc
->ap
;
3284 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3286 if (ap
->ops
->check_atapi_dma
)
3287 rc
= ap
->ops
->check_atapi_dma(qc
);
3292 * ata_qc_prep - Prepare taskfile for submission
3293 * @qc: Metadata associated with taskfile to be prepared
3295 * Prepare ATA taskfile for submission.
3298 * spin_lock_irqsave(host_set lock)
3300 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3302 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3308 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3311 * ata_sg_init_one - Associate command with memory buffer
3312 * @qc: Command to be associated
3313 * @buf: Memory buffer
3314 * @buflen: Length of memory buffer, in bytes.
3316 * Initialize the data-related elements of queued_cmd @qc
3317 * to point to a single memory buffer, @buf of byte length @buflen.
3320 * spin_lock_irqsave(host_set lock)
3323 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3325 struct scatterlist
*sg
;
3327 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3329 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3330 qc
->__sg
= &qc
->sgent
;
3332 qc
->orig_n_elem
= 1;
3334 qc
->nbytes
= buflen
;
3337 sg_init_one(sg
, buf
, buflen
);
3341 * ata_sg_init - Associate command with scatter-gather table.
3342 * @qc: Command to be associated
3343 * @sg: Scatter-gather table.
3344 * @n_elem: Number of elements in s/g table.
3346 * Initialize the data-related elements of queued_cmd @qc
3347 * to point to a scatter-gather table @sg, containing @n_elem
3351 * spin_lock_irqsave(host_set lock)
3354 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3355 unsigned int n_elem
)
3357 qc
->flags
|= ATA_QCFLAG_SG
;
3359 qc
->n_elem
= n_elem
;
3360 qc
->orig_n_elem
= n_elem
;
3364 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3365 * @qc: Command with memory buffer to be mapped.
3367 * DMA-map the memory buffer associated with queued_cmd @qc.
3370 * spin_lock_irqsave(host_set lock)
3373 * Zero on success, negative on error.
3376 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3378 struct ata_port
*ap
= qc
->ap
;
3379 int dir
= qc
->dma_dir
;
3380 struct scatterlist
*sg
= qc
->__sg
;
3381 dma_addr_t dma_address
;
3384 /* we must lengthen transfers to end on a 32-bit boundary */
3385 qc
->pad_len
= sg
->length
& 3;
3387 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3388 struct scatterlist
*psg
= &qc
->pad_sgent
;
3390 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3392 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3394 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3395 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3398 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3399 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3401 sg
->length
-= qc
->pad_len
;
3402 if (sg
->length
== 0)
3405 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3406 sg
->length
, qc
->pad_len
);
3414 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3416 if (dma_mapping_error(dma_address
)) {
3418 sg
->length
+= qc
->pad_len
;
3422 sg_dma_address(sg
) = dma_address
;
3423 sg_dma_len(sg
) = sg
->length
;
3426 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3427 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3433 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3434 * @qc: Command with scatter-gather table to be mapped.
3436 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3439 * spin_lock_irqsave(host_set lock)
3442 * Zero on success, negative on error.
3446 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3448 struct ata_port
*ap
= qc
->ap
;
3449 struct scatterlist
*sg
= qc
->__sg
;
3450 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3451 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3453 VPRINTK("ENTER, ata%u\n", ap
->id
);
3454 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3456 /* we must lengthen transfers to end on a 32-bit boundary */
3457 qc
->pad_len
= lsg
->length
& 3;
3459 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3460 struct scatterlist
*psg
= &qc
->pad_sgent
;
3461 unsigned int offset
;
3463 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3465 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3468 * psg->page/offset are used to copy to-be-written
3469 * data in this function or read data in ata_sg_clean.
3471 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3472 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3473 psg
->offset
= offset_in_page(offset
);
3475 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3476 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3477 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3478 kunmap_atomic(addr
, KM_IRQ0
);
3481 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3482 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3484 lsg
->length
-= qc
->pad_len
;
3485 if (lsg
->length
== 0)
3488 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3489 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3492 pre_n_elem
= qc
->n_elem
;
3493 if (trim_sg
&& pre_n_elem
)
3502 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3504 /* restore last sg */
3505 lsg
->length
+= qc
->pad_len
;
3509 DPRINTK("%d sg elements mapped\n", n_elem
);
3512 qc
->n_elem
= n_elem
;
3518 * swap_buf_le16 - swap halves of 16-bit words in place
3519 * @buf: Buffer to swap
3520 * @buf_words: Number of 16-bit words in buffer.
3522 * Swap halves of 16-bit words if needed to convert from
3523 * little-endian byte order to native cpu byte order, or
3527 * Inherited from caller.
3529 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3534 for (i
= 0; i
< buf_words
; i
++)
3535 buf
[i
] = le16_to_cpu(buf
[i
]);
3536 #endif /* __BIG_ENDIAN */
3540 * ata_mmio_data_xfer - Transfer data by MMIO
3541 * @adev: device for this I/O
3543 * @buflen: buffer length
3544 * @write_data: read/write
3546 * Transfer data from/to the device data register by MMIO.
3549 * Inherited from caller.
3552 void ata_mmio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3553 unsigned int buflen
, int write_data
)
3555 struct ata_port
*ap
= adev
->ap
;
3557 unsigned int words
= buflen
>> 1;
3558 u16
*buf16
= (u16
*) buf
;
3559 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3561 /* Transfer multiple of 2 bytes */
3563 for (i
= 0; i
< words
; i
++)
3564 writew(le16_to_cpu(buf16
[i
]), mmio
);
3566 for (i
= 0; i
< words
; i
++)
3567 buf16
[i
] = cpu_to_le16(readw(mmio
));
3570 /* Transfer trailing 1 byte, if any. */
3571 if (unlikely(buflen
& 0x01)) {
3572 u16 align_buf
[1] = { 0 };
3573 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3576 memcpy(align_buf
, trailing_buf
, 1);
3577 writew(le16_to_cpu(align_buf
[0]), mmio
);
3579 align_buf
[0] = cpu_to_le16(readw(mmio
));
3580 memcpy(trailing_buf
, align_buf
, 1);
3586 * ata_pio_data_xfer - Transfer data by PIO
3587 * @adev: device to target
3589 * @buflen: buffer length
3590 * @write_data: read/write
3592 * Transfer data from/to the device data register by PIO.
3595 * Inherited from caller.
3598 void ata_pio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3599 unsigned int buflen
, int write_data
)
3601 struct ata_port
*ap
= adev
->ap
;
3602 unsigned int words
= buflen
>> 1;
3604 /* Transfer multiple of 2 bytes */
3606 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3608 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3610 /* Transfer trailing 1 byte, if any. */
3611 if (unlikely(buflen
& 0x01)) {
3612 u16 align_buf
[1] = { 0 };
3613 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3616 memcpy(align_buf
, trailing_buf
, 1);
3617 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3619 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3620 memcpy(trailing_buf
, align_buf
, 1);
3626 * ata_pio_data_xfer_noirq - Transfer data by PIO
3627 * @adev: device to target
3629 * @buflen: buffer length
3630 * @write_data: read/write
3632 * Transfer data from/to the device data register by PIO. Do the
3633 * transfer with interrupts disabled.
3636 * Inherited from caller.
3639 void ata_pio_data_xfer_noirq(struct ata_device
*adev
, unsigned char *buf
,
3640 unsigned int buflen
, int write_data
)
3642 unsigned long flags
;
3643 local_irq_save(flags
);
3644 ata_pio_data_xfer(adev
, buf
, buflen
, write_data
);
3645 local_irq_restore(flags
);
3650 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3651 * @qc: Command on going
3653 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3656 * Inherited from caller.
3659 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3661 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3662 struct scatterlist
*sg
= qc
->__sg
;
3663 struct ata_port
*ap
= qc
->ap
;
3665 unsigned int offset
;
3668 if (qc
->cursect
== (qc
->nsect
- 1))
3669 ap
->hsm_task_state
= HSM_ST_LAST
;
3671 page
= sg
[qc
->cursg
].page
;
3672 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3674 /* get the current page and offset */
3675 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3676 offset
%= PAGE_SIZE
;
3678 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3680 if (PageHighMem(page
)) {
3681 unsigned long flags
;
3683 /* FIXME: use a bounce buffer */
3684 local_irq_save(flags
);
3685 buf
= kmap_atomic(page
, KM_IRQ0
);
3687 /* do the actual data transfer */
3688 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3690 kunmap_atomic(buf
, KM_IRQ0
);
3691 local_irq_restore(flags
);
3693 buf
= page_address(page
);
3694 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3700 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3707 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3708 * @qc: Command on going
3710 * Transfer one or many ATA_SECT_SIZE of data from/to the
3711 * ATA device for the DRQ request.
3714 * Inherited from caller.
3717 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3719 if (is_multi_taskfile(&qc
->tf
)) {
3720 /* READ/WRITE MULTIPLE */
3723 WARN_ON(qc
->dev
->multi_count
== 0);
3725 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3733 * atapi_send_cdb - Write CDB bytes to hardware
3734 * @ap: Port to which ATAPI device is attached.
3735 * @qc: Taskfile currently active
3737 * When device has indicated its readiness to accept
3738 * a CDB, this function is called. Send the CDB.
3744 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3747 DPRINTK("send cdb\n");
3748 WARN_ON(qc
->dev
->cdb_len
< 12);
3750 ap
->ops
->data_xfer(qc
->dev
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3751 ata_altstatus(ap
); /* flush */
3753 switch (qc
->tf
.protocol
) {
3754 case ATA_PROT_ATAPI
:
3755 ap
->hsm_task_state
= HSM_ST
;
3757 case ATA_PROT_ATAPI_NODATA
:
3758 ap
->hsm_task_state
= HSM_ST_LAST
;
3760 case ATA_PROT_ATAPI_DMA
:
3761 ap
->hsm_task_state
= HSM_ST_LAST
;
3762 /* initiate bmdma */
3763 ap
->ops
->bmdma_start(qc
);
3769 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3770 * @qc: Command on going
3771 * @bytes: number of bytes
3773 * Transfer Transfer data from/to the ATAPI device.
3776 * Inherited from caller.
3780 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3782 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3783 struct scatterlist
*sg
= qc
->__sg
;
3784 struct ata_port
*ap
= qc
->ap
;
3787 unsigned int offset
, count
;
3789 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3790 ap
->hsm_task_state
= HSM_ST_LAST
;
3793 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3795 * The end of qc->sg is reached and the device expects
3796 * more data to transfer. In order not to overrun qc->sg
3797 * and fulfill length specified in the byte count register,
3798 * - for read case, discard trailing data from the device
3799 * - for write case, padding zero data to the device
3801 u16 pad_buf
[1] = { 0 };
3802 unsigned int words
= bytes
>> 1;
3805 if (words
) /* warning if bytes > 1 */
3806 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3807 "%u bytes trailing data\n", bytes
);
3809 for (i
= 0; i
< words
; i
++)
3810 ap
->ops
->data_xfer(qc
->dev
, (unsigned char*)pad_buf
, 2, do_write
);
3812 ap
->hsm_task_state
= HSM_ST_LAST
;
3816 sg
= &qc
->__sg
[qc
->cursg
];
3819 offset
= sg
->offset
+ qc
->cursg_ofs
;
3821 /* get the current page and offset */
3822 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3823 offset
%= PAGE_SIZE
;
3825 /* don't overrun current sg */
3826 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3828 /* don't cross page boundaries */
3829 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3831 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3833 if (PageHighMem(page
)) {
3834 unsigned long flags
;
3836 /* FIXME: use bounce buffer */
3837 local_irq_save(flags
);
3838 buf
= kmap_atomic(page
, KM_IRQ0
);
3840 /* do the actual data transfer */
3841 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3843 kunmap_atomic(buf
, KM_IRQ0
);
3844 local_irq_restore(flags
);
3846 buf
= page_address(page
);
3847 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3851 qc
->curbytes
+= count
;
3852 qc
->cursg_ofs
+= count
;
3854 if (qc
->cursg_ofs
== sg
->length
) {
3864 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3865 * @qc: Command on going
3867 * Transfer Transfer data from/to the ATAPI device.
3870 * Inherited from caller.
3873 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3875 struct ata_port
*ap
= qc
->ap
;
3876 struct ata_device
*dev
= qc
->dev
;
3877 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3878 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3880 /* Abuse qc->result_tf for temp storage of intermediate TF
3881 * here to save some kernel stack usage.
3882 * For normal completion, qc->result_tf is not relevant. For
3883 * error, qc->result_tf is later overwritten by ata_qc_complete().
3884 * So, the correctness of qc->result_tf is not affected.
3886 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
3887 ireason
= qc
->result_tf
.nsect
;
3888 bc_lo
= qc
->result_tf
.lbam
;
3889 bc_hi
= qc
->result_tf
.lbah
;
3890 bytes
= (bc_hi
<< 8) | bc_lo
;
3892 /* shall be cleared to zero, indicating xfer of data */
3893 if (ireason
& (1 << 0))
3896 /* make sure transfer direction matches expected */
3897 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3898 if (do_write
!= i_write
)
3901 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3903 __atapi_pio_bytes(qc
, bytes
);
3908 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
3909 qc
->err_mask
|= AC_ERR_HSM
;
3910 ap
->hsm_task_state
= HSM_ST_ERR
;
3914 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3915 * @ap: the target ata_port
3919 * 1 if ok in workqueue, 0 otherwise.
3922 static inline int ata_hsm_ok_in_wq(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3924 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3927 if (ap
->hsm_task_state
== HSM_ST_FIRST
) {
3928 if (qc
->tf
.protocol
== ATA_PROT_PIO
&&
3929 (qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3932 if (is_atapi_taskfile(&qc
->tf
) &&
3933 !(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3941 * ata_hsm_qc_complete - finish a qc running on standard HSM
3942 * @qc: Command to complete
3943 * @in_wq: 1 if called from workqueue, 0 otherwise
3945 * Finish @qc which is running on standard HSM.
3948 * If @in_wq is zero, spin_lock_irqsave(host_set lock).
3949 * Otherwise, none on entry and grabs host lock.
3951 static void ata_hsm_qc_complete(struct ata_queued_cmd
*qc
, int in_wq
)
3953 struct ata_port
*ap
= qc
->ap
;
3954 unsigned long flags
;
3956 if (ap
->ops
->error_handler
) {
3958 spin_lock_irqsave(ap
->lock
, flags
);
3960 /* EH might have kicked in while host_set lock
3963 qc
= ata_qc_from_tag(ap
, qc
->tag
);
3965 if (likely(!(qc
->err_mask
& AC_ERR_HSM
))) {
3967 ata_qc_complete(qc
);
3969 ata_port_freeze(ap
);
3972 spin_unlock_irqrestore(ap
->lock
, flags
);
3974 if (likely(!(qc
->err_mask
& AC_ERR_HSM
)))
3975 ata_qc_complete(qc
);
3977 ata_port_freeze(ap
);
3981 spin_lock_irqsave(ap
->lock
, flags
);
3983 ata_qc_complete(qc
);
3984 spin_unlock_irqrestore(ap
->lock
, flags
);
3986 ata_qc_complete(qc
);
3989 ata_altstatus(ap
); /* flush */
3993 * ata_hsm_move - move the HSM to the next state.
3994 * @ap: the target ata_port
3996 * @status: current device status
3997 * @in_wq: 1 if called from workqueue, 0 otherwise
4000 * 1 when poll next status needed, 0 otherwise.
4002 int ata_hsm_move(struct ata_port
*ap
, struct ata_queued_cmd
*qc
,
4003 u8 status
, int in_wq
)
4005 unsigned long flags
= 0;
4008 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
4010 /* Make sure ata_qc_issue_prot() does not throw things
4011 * like DMA polling into the workqueue. Notice that
4012 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
4014 WARN_ON(in_wq
!= ata_hsm_ok_in_wq(ap
, qc
));
4017 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4018 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
4020 switch (ap
->hsm_task_state
) {
4022 /* Send first data block or PACKET CDB */
4024 /* If polling, we will stay in the work queue after
4025 * sending the data. Otherwise, interrupt handler
4026 * takes over after sending the data.
4028 poll_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4030 /* check device status */
4031 if (unlikely((status
& ATA_DRQ
) == 0)) {
4032 /* handle BSY=0, DRQ=0 as error */
4033 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4034 /* device stops HSM for abort/error */
4035 qc
->err_mask
|= AC_ERR_DEV
;
4037 /* HSM violation. Let EH handle this */
4038 qc
->err_mask
|= AC_ERR_HSM
;
4040 ap
->hsm_task_state
= HSM_ST_ERR
;
4044 /* Device should not ask for data transfer (DRQ=1)
4045 * when it finds something wrong.
4046 * We ignore DRQ here and stop the HSM by
4047 * changing hsm_task_state to HSM_ST_ERR and
4048 * let the EH abort the command or reset the device.
4050 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4051 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4053 qc
->err_mask
|= AC_ERR_HSM
;
4054 ap
->hsm_task_state
= HSM_ST_ERR
;
4058 /* Send the CDB (atapi) or the first data block (ata pio out).
4059 * During the state transition, interrupt handler shouldn't
4060 * be invoked before the data transfer is complete and
4061 * hsm_task_state is changed. Hence, the following locking.
4064 spin_lock_irqsave(ap
->lock
, flags
);
4066 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
4067 /* PIO data out protocol.
4068 * send first data block.
4071 /* ata_pio_sectors() might change the state
4072 * to HSM_ST_LAST. so, the state is changed here
4073 * before ata_pio_sectors().
4075 ap
->hsm_task_state
= HSM_ST
;
4076 ata_pio_sectors(qc
);
4077 ata_altstatus(ap
); /* flush */
4080 atapi_send_cdb(ap
, qc
);
4083 spin_unlock_irqrestore(ap
->lock
, flags
);
4085 /* if polling, ata_pio_task() handles the rest.
4086 * otherwise, interrupt handler takes over from here.
4091 /* complete command or read/write the data register */
4092 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4093 /* ATAPI PIO protocol */
4094 if ((status
& ATA_DRQ
) == 0) {
4095 /* No more data to transfer or device error.
4096 * Device error will be tagged in HSM_ST_LAST.
4098 ap
->hsm_task_state
= HSM_ST_LAST
;
4102 /* Device should not ask for data transfer (DRQ=1)
4103 * when it finds something wrong.
4104 * We ignore DRQ here and stop the HSM by
4105 * changing hsm_task_state to HSM_ST_ERR and
4106 * let the EH abort the command or reset the device.
4108 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4109 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4111 qc
->err_mask
|= AC_ERR_HSM
;
4112 ap
->hsm_task_state
= HSM_ST_ERR
;
4116 atapi_pio_bytes(qc
);
4118 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4119 /* bad ireason reported by device */
4123 /* ATA PIO protocol */
4124 if (unlikely((status
& ATA_DRQ
) == 0)) {
4125 /* handle BSY=0, DRQ=0 as error */
4126 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4127 /* device stops HSM for abort/error */
4128 qc
->err_mask
|= AC_ERR_DEV
;
4130 /* HSM violation. Let EH handle this */
4131 qc
->err_mask
|= AC_ERR_HSM
;
4133 ap
->hsm_task_state
= HSM_ST_ERR
;
4137 /* For PIO reads, some devices may ask for
4138 * data transfer (DRQ=1) alone with ERR=1.
4139 * We respect DRQ here and transfer one
4140 * block of junk data before changing the
4141 * hsm_task_state to HSM_ST_ERR.
4143 * For PIO writes, ERR=1 DRQ=1 doesn't make
4144 * sense since the data block has been
4145 * transferred to the device.
4147 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4148 /* data might be corrputed */
4149 qc
->err_mask
|= AC_ERR_DEV
;
4151 if (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
)) {
4152 ata_pio_sectors(qc
);
4154 status
= ata_wait_idle(ap
);
4157 if (status
& (ATA_BUSY
| ATA_DRQ
))
4158 qc
->err_mask
|= AC_ERR_HSM
;
4160 /* ata_pio_sectors() might change the
4161 * state to HSM_ST_LAST. so, the state
4162 * is changed after ata_pio_sectors().
4164 ap
->hsm_task_state
= HSM_ST_ERR
;
4168 ata_pio_sectors(qc
);
4170 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4171 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4174 status
= ata_wait_idle(ap
);
4179 ata_altstatus(ap
); /* flush */
4184 if (unlikely(!ata_ok(status
))) {
4185 qc
->err_mask
|= __ac_err_mask(status
);
4186 ap
->hsm_task_state
= HSM_ST_ERR
;
4190 /* no more data to transfer */
4191 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4192 ap
->id
, qc
->dev
->devno
, status
);
4194 WARN_ON(qc
->err_mask
);
4196 ap
->hsm_task_state
= HSM_ST_IDLE
;
4198 /* complete taskfile transaction */
4199 ata_hsm_qc_complete(qc
, in_wq
);
4205 /* make sure qc->err_mask is available to
4206 * know what's wrong and recover
4208 WARN_ON(qc
->err_mask
== 0);
4210 ap
->hsm_task_state
= HSM_ST_IDLE
;
4212 /* complete taskfile transaction */
4213 ata_hsm_qc_complete(qc
, in_wq
);
4225 static void ata_pio_task(void *_data
)
4227 struct ata_queued_cmd
*qc
= _data
;
4228 struct ata_port
*ap
= qc
->ap
;
4233 WARN_ON(ap
->hsm_task_state
== HSM_ST_IDLE
);
4236 * This is purely heuristic. This is a fast path.
4237 * Sometimes when we enter, BSY will be cleared in
4238 * a chk-status or two. If not, the drive is probably seeking
4239 * or something. Snooze for a couple msecs, then
4240 * chk-status again. If still busy, queue delayed work.
4242 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
4243 if (status
& ATA_BUSY
) {
4245 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
4246 if (status
& ATA_BUSY
) {
4247 ata_port_queue_task(ap
, ata_pio_task
, qc
, ATA_SHORT_PAUSE
);
4253 poll_next
= ata_hsm_move(ap
, qc
, status
, 1);
4255 /* another command or interrupt handler
4256 * may be running at this point.
4263 * ata_qc_new - Request an available ATA command, for queueing
4264 * @ap: Port associated with device @dev
4265 * @dev: Device from whom we request an available command structure
4271 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4273 struct ata_queued_cmd
*qc
= NULL
;
4276 /* no command while frozen */
4277 if (unlikely(ap
->pflags
& ATA_PFLAG_FROZEN
))
4280 /* the last tag is reserved for internal command. */
4281 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4282 if (!test_and_set_bit(i
, &ap
->qc_allocated
)) {
4283 qc
= __ata_qc_from_tag(ap
, i
);
4294 * ata_qc_new_init - Request an available ATA command, and initialize it
4295 * @dev: Device from whom we request an available command structure
4301 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4303 struct ata_port
*ap
= dev
->ap
;
4304 struct ata_queued_cmd
*qc
;
4306 qc
= ata_qc_new(ap
);
4319 * ata_qc_free - free unused ata_queued_cmd
4320 * @qc: Command to complete
4322 * Designed to free unused ata_queued_cmd object
4323 * in case something prevents using it.
4326 * spin_lock_irqsave(host_set lock)
4328 void ata_qc_free(struct ata_queued_cmd
*qc
)
4330 struct ata_port
*ap
= qc
->ap
;
4333 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4337 if (likely(ata_tag_valid(tag
))) {
4338 qc
->tag
= ATA_TAG_POISON
;
4339 clear_bit(tag
, &ap
->qc_allocated
);
4343 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4345 struct ata_port
*ap
= qc
->ap
;
4347 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4348 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4350 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4353 /* command should be marked inactive atomically with qc completion */
4354 if (qc
->tf
.protocol
== ATA_PROT_NCQ
)
4355 ap
->sactive
&= ~(1 << qc
->tag
);
4357 ap
->active_tag
= ATA_TAG_POISON
;
4359 /* atapi: mark qc as inactive to prevent the interrupt handler
4360 * from completing the command twice later, before the error handler
4361 * is called. (when rc != 0 and atapi request sense is needed)
4363 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4364 ap
->qc_active
&= ~(1 << qc
->tag
);
4366 /* call completion callback */
4367 qc
->complete_fn(qc
);
4371 * ata_qc_complete - Complete an active ATA command
4372 * @qc: Command to complete
4373 * @err_mask: ATA Status register contents
4375 * Indicate to the mid and upper layers that an ATA
4376 * command has completed, with either an ok or not-ok status.
4379 * spin_lock_irqsave(host_set lock)
4381 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4383 struct ata_port
*ap
= qc
->ap
;
4385 /* XXX: New EH and old EH use different mechanisms to
4386 * synchronize EH with regular execution path.
4388 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4389 * Normal execution path is responsible for not accessing a
4390 * failed qc. libata core enforces the rule by returning NULL
4391 * from ata_qc_from_tag() for failed qcs.
4393 * Old EH depends on ata_qc_complete() nullifying completion
4394 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4395 * not synchronize with interrupt handler. Only PIO task is
4398 if (ap
->ops
->error_handler
) {
4399 WARN_ON(ap
->pflags
& ATA_PFLAG_FROZEN
);
4401 if (unlikely(qc
->err_mask
))
4402 qc
->flags
|= ATA_QCFLAG_FAILED
;
4404 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4405 if (!ata_tag_internal(qc
->tag
)) {
4406 /* always fill result TF for failed qc */
4407 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4408 ata_qc_schedule_eh(qc
);
4413 /* read result TF if requested */
4414 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4415 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4417 __ata_qc_complete(qc
);
4419 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4422 /* read result TF if failed or requested */
4423 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4424 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4426 __ata_qc_complete(qc
);
4431 * ata_qc_complete_multiple - Complete multiple qcs successfully
4432 * @ap: port in question
4433 * @qc_active: new qc_active mask
4434 * @finish_qc: LLDD callback invoked before completing a qc
4436 * Complete in-flight commands. This functions is meant to be
4437 * called from low-level driver's interrupt routine to complete
4438 * requests normally. ap->qc_active and @qc_active is compared
4439 * and commands are completed accordingly.
4442 * spin_lock_irqsave(host_set lock)
4445 * Number of completed commands on success, -errno otherwise.
4447 int ata_qc_complete_multiple(struct ata_port
*ap
, u32 qc_active
,
4448 void (*finish_qc
)(struct ata_queued_cmd
*))
4454 done_mask
= ap
->qc_active
^ qc_active
;
4456 if (unlikely(done_mask
& qc_active
)) {
4457 ata_port_printk(ap
, KERN_ERR
, "illegal qc_active transition "
4458 "(%08x->%08x)\n", ap
->qc_active
, qc_active
);
4462 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
4463 struct ata_queued_cmd
*qc
;
4465 if (!(done_mask
& (1 << i
)))
4468 if ((qc
= ata_qc_from_tag(ap
, i
))) {
4471 ata_qc_complete(qc
);
4479 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4481 struct ata_port
*ap
= qc
->ap
;
4483 switch (qc
->tf
.protocol
) {
4486 case ATA_PROT_ATAPI_DMA
:
4489 case ATA_PROT_ATAPI
:
4491 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4504 * ata_qc_issue - issue taskfile to device
4505 * @qc: command to issue to device
4507 * Prepare an ATA command to submission to device.
4508 * This includes mapping the data into a DMA-able
4509 * area, filling in the S/G table, and finally
4510 * writing the taskfile to hardware, starting the command.
4513 * spin_lock_irqsave(host_set lock)
4515 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4517 struct ata_port
*ap
= qc
->ap
;
4519 /* Make sure only one non-NCQ command is outstanding. The
4520 * check is skipped for old EH because it reuses active qc to
4521 * request ATAPI sense.
4523 WARN_ON(ap
->ops
->error_handler
&& ata_tag_valid(ap
->active_tag
));
4525 if (qc
->tf
.protocol
== ATA_PROT_NCQ
) {
4526 WARN_ON(ap
->sactive
& (1 << qc
->tag
));
4527 ap
->sactive
|= 1 << qc
->tag
;
4529 WARN_ON(ap
->sactive
);
4530 ap
->active_tag
= qc
->tag
;
4533 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4534 ap
->qc_active
|= 1 << qc
->tag
;
4536 if (ata_should_dma_map(qc
)) {
4537 if (qc
->flags
& ATA_QCFLAG_SG
) {
4538 if (ata_sg_setup(qc
))
4540 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4541 if (ata_sg_setup_one(qc
))
4545 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4548 ap
->ops
->qc_prep(qc
);
4550 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4551 if (unlikely(qc
->err_mask
))
4556 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4557 qc
->err_mask
|= AC_ERR_SYSTEM
;
4559 ata_qc_complete(qc
);
4563 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4564 * @qc: command to issue to device
4566 * Using various libata functions and hooks, this function
4567 * starts an ATA command. ATA commands are grouped into
4568 * classes called "protocols", and issuing each type of protocol
4569 * is slightly different.
4571 * May be used as the qc_issue() entry in ata_port_operations.
4574 * spin_lock_irqsave(host_set lock)
4577 * Zero on success, AC_ERR_* mask on failure
4580 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4582 struct ata_port
*ap
= qc
->ap
;
4584 /* Use polling pio if the LLD doesn't handle
4585 * interrupt driven pio and atapi CDB interrupt.
4587 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4588 switch (qc
->tf
.protocol
) {
4590 case ATA_PROT_ATAPI
:
4591 case ATA_PROT_ATAPI_NODATA
:
4592 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4594 case ATA_PROT_ATAPI_DMA
:
4595 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4596 /* see ata_dma_blacklisted() */
4604 /* select the device */
4605 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4607 /* start the command */
4608 switch (qc
->tf
.protocol
) {
4609 case ATA_PROT_NODATA
:
4610 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4611 ata_qc_set_polling(qc
);
4613 ata_tf_to_host(ap
, &qc
->tf
);
4614 ap
->hsm_task_state
= HSM_ST_LAST
;
4616 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4617 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4622 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4624 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4625 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4626 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4627 ap
->hsm_task_state
= HSM_ST_LAST
;
4631 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4632 ata_qc_set_polling(qc
);
4634 ata_tf_to_host(ap
, &qc
->tf
);
4636 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4637 /* PIO data out protocol */
4638 ap
->hsm_task_state
= HSM_ST_FIRST
;
4639 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4641 /* always send first data block using
4642 * the ata_pio_task() codepath.
4645 /* PIO data in protocol */
4646 ap
->hsm_task_state
= HSM_ST
;
4648 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4649 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4651 /* if polling, ata_pio_task() handles the rest.
4652 * otherwise, interrupt handler takes over from here.
4658 case ATA_PROT_ATAPI
:
4659 case ATA_PROT_ATAPI_NODATA
:
4660 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4661 ata_qc_set_polling(qc
);
4663 ata_tf_to_host(ap
, &qc
->tf
);
4665 ap
->hsm_task_state
= HSM_ST_FIRST
;
4667 /* send cdb by polling if no cdb interrupt */
4668 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4669 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4670 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4673 case ATA_PROT_ATAPI_DMA
:
4674 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4676 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4677 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4678 ap
->hsm_task_state
= HSM_ST_FIRST
;
4680 /* send cdb by polling if no cdb interrupt */
4681 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4682 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4687 return AC_ERR_SYSTEM
;
4694 * ata_host_intr - Handle host interrupt for given (port, task)
4695 * @ap: Port on which interrupt arrived (possibly...)
4696 * @qc: Taskfile currently active in engine
4698 * Handle host interrupt for given queued command. Currently,
4699 * only DMA interrupts are handled. All other commands are
4700 * handled via polling with interrupts disabled (nIEN bit).
4703 * spin_lock_irqsave(host_set lock)
4706 * One if interrupt was handled, zero if not (shared irq).
4709 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4710 struct ata_queued_cmd
*qc
)
4712 u8 status
, host_stat
= 0;
4714 VPRINTK("ata%u: protocol %d task_state %d\n",
4715 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4717 /* Check whether we are expecting interrupt in this state */
4718 switch (ap
->hsm_task_state
) {
4720 /* Some pre-ATAPI-4 devices assert INTRQ
4721 * at this state when ready to receive CDB.
4724 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4725 * The flag was turned on only for atapi devices.
4726 * No need to check is_atapi_taskfile(&qc->tf) again.
4728 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4732 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4733 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4734 /* check status of DMA engine */
4735 host_stat
= ap
->ops
->bmdma_status(ap
);
4736 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4738 /* if it's not our irq... */
4739 if (!(host_stat
& ATA_DMA_INTR
))
4742 /* before we do anything else, clear DMA-Start bit */
4743 ap
->ops
->bmdma_stop(qc
);
4745 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4746 /* error when transfering data to/from memory */
4747 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4748 ap
->hsm_task_state
= HSM_ST_ERR
;
4758 /* check altstatus */
4759 status
= ata_altstatus(ap
);
4760 if (status
& ATA_BUSY
)
4763 /* check main status, clearing INTRQ */
4764 status
= ata_chk_status(ap
);
4765 if (unlikely(status
& ATA_BUSY
))
4768 /* ack bmdma irq events */
4769 ap
->ops
->irq_clear(ap
);
4771 ata_hsm_move(ap
, qc
, status
, 0);
4772 return 1; /* irq handled */
4775 ap
->stats
.idle_irq
++;
4778 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4779 ata_irq_ack(ap
, 0); /* debug trap */
4780 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4784 return 0; /* irq not handled */
4788 * ata_interrupt - Default ATA host interrupt handler
4789 * @irq: irq line (unused)
4790 * @dev_instance: pointer to our ata_host_set information structure
4793 * Default interrupt handler for PCI IDE devices. Calls
4794 * ata_host_intr() for each port that is not disabled.
4797 * Obtains host_set lock during operation.
4800 * IRQ_NONE or IRQ_HANDLED.
4803 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4805 struct ata_host_set
*host_set
= dev_instance
;
4807 unsigned int handled
= 0;
4808 unsigned long flags
;
4810 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4811 spin_lock_irqsave(&host_set
->lock
, flags
);
4813 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4814 struct ata_port
*ap
;
4816 ap
= host_set
->ports
[i
];
4818 !(ap
->flags
& ATA_FLAG_DISABLED
)) {
4819 struct ata_queued_cmd
*qc
;
4821 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4822 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4823 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4824 handled
|= ata_host_intr(ap
, qc
);
4828 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4830 return IRQ_RETVAL(handled
);
4834 * sata_scr_valid - test whether SCRs are accessible
4835 * @ap: ATA port to test SCR accessibility for
4837 * Test whether SCRs are accessible for @ap.
4843 * 1 if SCRs are accessible, 0 otherwise.
4845 int sata_scr_valid(struct ata_port
*ap
)
4847 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4851 * sata_scr_read - read SCR register of the specified port
4852 * @ap: ATA port to read SCR for
4854 * @val: Place to store read value
4856 * Read SCR register @reg of @ap into *@val. This function is
4857 * guaranteed to succeed if the cable type of the port is SATA
4858 * and the port implements ->scr_read.
4864 * 0 on success, negative errno on failure.
4866 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4868 if (sata_scr_valid(ap
)) {
4869 *val
= ap
->ops
->scr_read(ap
, reg
);
4876 * sata_scr_write - write SCR register of the specified port
4877 * @ap: ATA port to write SCR for
4878 * @reg: SCR to write
4879 * @val: value to write
4881 * Write @val to SCR register @reg of @ap. This function is
4882 * guaranteed to succeed if the cable type of the port is SATA
4883 * and the port implements ->scr_read.
4889 * 0 on success, negative errno on failure.
4891 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4893 if (sata_scr_valid(ap
)) {
4894 ap
->ops
->scr_write(ap
, reg
, val
);
4901 * sata_scr_write_flush - write SCR register of the specified port and flush
4902 * @ap: ATA port to write SCR for
4903 * @reg: SCR to write
4904 * @val: value to write
4906 * This function is identical to sata_scr_write() except that this
4907 * function performs flush after writing to the register.
4913 * 0 on success, negative errno on failure.
4915 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4917 if (sata_scr_valid(ap
)) {
4918 ap
->ops
->scr_write(ap
, reg
, val
);
4919 ap
->ops
->scr_read(ap
, reg
);
4926 * ata_port_online - test whether the given port is online
4927 * @ap: ATA port to test
4929 * Test whether @ap is online. Note that this function returns 0
4930 * if online status of @ap cannot be obtained, so
4931 * ata_port_online(ap) != !ata_port_offline(ap).
4937 * 1 if the port online status is available and online.
4939 int ata_port_online(struct ata_port
*ap
)
4943 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4949 * ata_port_offline - test whether the given port is offline
4950 * @ap: ATA port to test
4952 * Test whether @ap is offline. Note that this function returns
4953 * 0 if offline status of @ap cannot be obtained, so
4954 * ata_port_online(ap) != !ata_port_offline(ap).
4960 * 1 if the port offline status is available and offline.
4962 int ata_port_offline(struct ata_port
*ap
)
4966 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4971 int ata_flush_cache(struct ata_device
*dev
)
4973 unsigned int err_mask
;
4976 if (!ata_try_flush_cache(dev
))
4979 if (ata_id_has_flush_ext(dev
->id
))
4980 cmd
= ATA_CMD_FLUSH_EXT
;
4982 cmd
= ATA_CMD_FLUSH
;
4984 err_mask
= ata_do_simple_cmd(dev
, cmd
);
4986 ata_dev_printk(dev
, KERN_ERR
, "failed to flush cache\n");
4993 static int ata_host_set_request_pm(struct ata_host_set
*host_set
,
4994 pm_message_t mesg
, unsigned int action
,
4995 unsigned int ehi_flags
, int wait
)
4997 unsigned long flags
;
5000 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5001 struct ata_port
*ap
= host_set
->ports
[i
];
5003 /* Previous resume operation might still be in
5004 * progress. Wait for PM_PENDING to clear.
5006 if (ap
->pflags
& ATA_PFLAG_PM_PENDING
) {
5007 ata_port_wait_eh(ap
);
5008 WARN_ON(ap
->pflags
& ATA_PFLAG_PM_PENDING
);
5011 /* request PM ops to EH */
5012 spin_lock_irqsave(ap
->lock
, flags
);
5017 ap
->pm_result
= &rc
;
5020 ap
->pflags
|= ATA_PFLAG_PM_PENDING
;
5021 ap
->eh_info
.action
|= action
;
5022 ap
->eh_info
.flags
|= ehi_flags
;
5024 ata_port_schedule_eh(ap
);
5026 spin_unlock_irqrestore(ap
->lock
, flags
);
5028 /* wait and check result */
5030 ata_port_wait_eh(ap
);
5031 WARN_ON(ap
->pflags
& ATA_PFLAG_PM_PENDING
);
5041 * ata_host_set_suspend - suspend host_set
5042 * @host_set: host_set to suspend
5045 * Suspend @host_set. Actual operation is performed by EH. This
5046 * function requests EH to perform PM operations and waits for EH
5050 * Kernel thread context (may sleep).
5053 * 0 on success, -errno on failure.
5055 int ata_host_set_suspend(struct ata_host_set
*host_set
, pm_message_t mesg
)
5059 rc
= ata_host_set_request_pm(host_set
, mesg
, 0, ATA_EHI_QUIET
, 1);
5063 /* EH is quiescent now. Fail if we have any ready device.
5064 * This happens if hotplug occurs between completion of device
5065 * suspension and here.
5067 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5068 struct ata_port
*ap
= host_set
->ports
[i
];
5070 for (j
= 0; j
< ATA_MAX_DEVICES
; j
++) {
5071 struct ata_device
*dev
= &ap
->device
[j
];
5073 if (ata_dev_ready(dev
)) {
5074 ata_port_printk(ap
, KERN_WARNING
,
5075 "suspend failed, device %d "
5076 "still active\n", dev
->devno
);
5083 host_set
->dev
->power
.power_state
= mesg
;
5087 ata_host_set_resume(host_set
);
5092 * ata_host_set_resume - resume host_set
5093 * @host_set: host_set to resume
5095 * Resume @host_set. Actual operation is performed by EH. This
5096 * function requests EH to perform PM operations and returns.
5097 * Note that all resume operations are performed parallely.
5100 * Kernel thread context (may sleep).
5102 void ata_host_set_resume(struct ata_host_set
*host_set
)
5104 ata_host_set_request_pm(host_set
, PMSG_ON
, ATA_EH_SOFTRESET
,
5105 ATA_EHI_NO_AUTOPSY
| ATA_EHI_QUIET
, 0);
5106 host_set
->dev
->power
.power_state
= PMSG_ON
;
5110 * ata_port_start - Set port up for dma.
5111 * @ap: Port to initialize
5113 * Called just after data structures for each port are
5114 * initialized. Allocates space for PRD table.
5116 * May be used as the port_start() entry in ata_port_operations.
5119 * Inherited from caller.
5122 int ata_port_start (struct ata_port
*ap
)
5124 struct device
*dev
= ap
->dev
;
5127 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
5131 rc
= ata_pad_alloc(ap
, dev
);
5133 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5137 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
5144 * ata_port_stop - Undo ata_port_start()
5145 * @ap: Port to shut down
5147 * Frees the PRD table.
5149 * May be used as the port_stop() entry in ata_port_operations.
5152 * Inherited from caller.
5155 void ata_port_stop (struct ata_port
*ap
)
5157 struct device
*dev
= ap
->dev
;
5159 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5160 ata_pad_free(ap
, dev
);
5163 void ata_host_stop (struct ata_host_set
*host_set
)
5165 if (host_set
->mmio_base
)
5166 iounmap(host_set
->mmio_base
);
5170 * ata_dev_init - Initialize an ata_device structure
5171 * @dev: Device structure to initialize
5173 * Initialize @dev in preparation for probing.
5176 * Inherited from caller.
5178 void ata_dev_init(struct ata_device
*dev
)
5180 struct ata_port
*ap
= dev
->ap
;
5181 unsigned long flags
;
5183 /* SATA spd limit is bound to the first device */
5184 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5186 /* High bits of dev->flags are used to record warm plug
5187 * requests which occur asynchronously. Synchronize using
5190 spin_lock_irqsave(ap
->lock
, flags
);
5191 dev
->flags
&= ~ATA_DFLAG_INIT_MASK
;
5192 spin_unlock_irqrestore(ap
->lock
, flags
);
5194 memset((void *)dev
+ ATA_DEVICE_CLEAR_OFFSET
, 0,
5195 sizeof(*dev
) - ATA_DEVICE_CLEAR_OFFSET
);
5196 dev
->pio_mask
= UINT_MAX
;
5197 dev
->mwdma_mask
= UINT_MAX
;
5198 dev
->udma_mask
= UINT_MAX
;
5202 * ata_port_init - Initialize an ata_port structure
5203 * @ap: Structure to initialize
5204 * @host_set: Collection of hosts to which @ap belongs
5205 * @ent: Probe information provided by low-level driver
5206 * @port_no: Port number associated with this ata_port
5208 * Initialize a new ata_port structure.
5211 * Inherited from caller.
5213 void ata_port_init(struct ata_port
*ap
, struct ata_host_set
*host_set
,
5214 const struct ata_probe_ent
*ent
, unsigned int port_no
)
5218 ap
->lock
= &host_set
->lock
;
5219 ap
->flags
= ATA_FLAG_DISABLED
;
5220 ap
->id
= ata_unique_id
++;
5221 ap
->ctl
= ATA_DEVCTL_OBS
;
5222 ap
->host_set
= host_set
;
5224 ap
->port_no
= port_no
;
5225 ap
->pio_mask
= ent
->pio_mask
;
5226 ap
->mwdma_mask
= ent
->mwdma_mask
;
5227 ap
->udma_mask
= ent
->udma_mask
;
5228 ap
->flags
|= ent
->host_flags
;
5229 ap
->ops
= ent
->port_ops
;
5230 ap
->hw_sata_spd_limit
= UINT_MAX
;
5231 ap
->active_tag
= ATA_TAG_POISON
;
5232 ap
->last_ctl
= 0xFF;
5234 #if defined(ATA_VERBOSE_DEBUG)
5235 /* turn on all debugging levels */
5236 ap
->msg_enable
= 0x00FF;
5237 #elif defined(ATA_DEBUG)
5238 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_INFO
| ATA_MSG_CTL
| ATA_MSG_WARN
| ATA_MSG_ERR
;
5240 ap
->msg_enable
= ATA_MSG_DRV
| ATA_MSG_ERR
| ATA_MSG_WARN
;
5243 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
5244 INIT_WORK(&ap
->hotplug_task
, ata_scsi_hotplug
, ap
);
5245 INIT_WORK(&ap
->scsi_rescan_task
, ata_scsi_dev_rescan
, ap
);
5246 INIT_LIST_HEAD(&ap
->eh_done_q
);
5247 init_waitqueue_head(&ap
->eh_wait_q
);
5249 /* set cable type */
5250 ap
->cbl
= ATA_CBL_NONE
;
5251 if (ap
->flags
& ATA_FLAG_SATA
)
5252 ap
->cbl
= ATA_CBL_SATA
;
5254 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
5255 struct ata_device
*dev
= &ap
->device
[i
];
5262 ap
->stats
.unhandled_irq
= 1;
5263 ap
->stats
.idle_irq
= 1;
5266 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
5270 * ata_port_init_shost - Initialize SCSI host associated with ATA port
5271 * @ap: ATA port to initialize SCSI host for
5272 * @shost: SCSI host associated with @ap
5274 * Initialize SCSI host @shost associated with ATA port @ap.
5277 * Inherited from caller.
5279 static void ata_port_init_shost(struct ata_port
*ap
, struct Scsi_Host
*shost
)
5283 shost
->unique_id
= ap
->id
;
5286 shost
->max_channel
= 1;
5287 shost
->max_cmd_len
= 12;
5291 * ata_port_add - Attach low-level ATA driver to system
5292 * @ent: Information provided by low-level driver
5293 * @host_set: Collections of ports to which we add
5294 * @port_no: Port number associated with this host
5296 * Attach low-level ATA driver to system.
5299 * PCI/etc. bus probe sem.
5302 * New ata_port on success, for NULL on error.
5304 static struct ata_port
* ata_port_add(const struct ata_probe_ent
*ent
,
5305 struct ata_host_set
*host_set
,
5306 unsigned int port_no
)
5308 struct Scsi_Host
*shost
;
5309 struct ata_port
*ap
;
5313 if (!ent
->port_ops
->error_handler
&&
5314 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
5315 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
5320 shost
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
5324 shost
->transportt
= &ata_scsi_transport_template
;
5326 ap
= ata_shost_to_port(shost
);
5328 ata_port_init(ap
, host_set
, ent
, port_no
);
5329 ata_port_init_shost(ap
, shost
);
5335 * ata_sas_host_init - Initialize a host_set struct
5336 * @host_set: host_set to initialize
5337 * @dev: device host_set is attached to
5338 * @flags: host_set flags
5342 * PCI/etc. bus probe sem.
5346 void ata_host_set_init(struct ata_host_set
*host_set
,
5347 struct device
*dev
, unsigned long flags
,
5348 const struct ata_port_operations
*ops
)
5350 spin_lock_init(&host_set
->lock
);
5351 host_set
->dev
= dev
;
5352 host_set
->flags
= flags
;
5353 host_set
->ops
= ops
;
5357 * ata_device_add - Register hardware device with ATA and SCSI layers
5358 * @ent: Probe information describing hardware device to be registered
5360 * This function processes the information provided in the probe
5361 * information struct @ent, allocates the necessary ATA and SCSI
5362 * host information structures, initializes them, and registers
5363 * everything with requisite kernel subsystems.
5365 * This function requests irqs, probes the ATA bus, and probes
5369 * PCI/etc. bus probe sem.
5372 * Number of ports registered. Zero on error (no ports registered).
5374 int ata_device_add(const struct ata_probe_ent
*ent
)
5377 struct device
*dev
= ent
->dev
;
5378 struct ata_host_set
*host_set
;
5382 /* alloc a container for our list of ATA ports (buses) */
5383 host_set
= kzalloc(sizeof(struct ata_host_set
) +
5384 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
5388 ata_host_set_init(host_set
, dev
, ent
->host_set_flags
, ent
->port_ops
);
5389 host_set
->n_ports
= ent
->n_ports
;
5390 host_set
->irq
= ent
->irq
;
5391 host_set
->irq2
= ent
->irq2
;
5392 host_set
->mmio_base
= ent
->mmio_base
;
5393 host_set
->private_data
= ent
->private_data
;
5395 /* register each port bound to this device */
5396 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5397 struct ata_port
*ap
;
5398 unsigned long xfer_mode_mask
;
5399 int irq_line
= ent
->irq
;
5401 ap
= ata_port_add(ent
, host_set
, i
);
5405 host_set
->ports
[i
] = ap
;
5408 if (ent
->dummy_port_mask
& (1 << i
)) {
5409 ata_port_printk(ap
, KERN_INFO
, "DUMMY\n");
5410 ap
->ops
= &ata_dummy_port_ops
;
5415 rc
= ap
->ops
->port_start(ap
);
5417 host_set
->ports
[i
] = NULL
;
5418 scsi_host_put(ap
->host
);
5422 /* Report the secondary IRQ for second channel legacy */
5423 if (i
== 1 && ent
->irq2
)
5424 irq_line
= ent
->irq2
;
5426 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
5427 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
5428 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
5430 /* print per-port info to dmesg */
5431 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
5432 "ctl 0x%lX bmdma 0x%lX irq %d\n",
5433 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
5434 ata_mode_string(xfer_mode_mask
),
5435 ap
->ioaddr
.cmd_addr
,
5436 ap
->ioaddr
.ctl_addr
,
5437 ap
->ioaddr
.bmdma_addr
,
5441 host_set
->ops
->irq_clear(ap
);
5442 ata_eh_freeze_port(ap
); /* freeze port before requesting IRQ */
5445 /* obtain irq, that may be shared between channels */
5446 rc
= request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5447 DRV_NAME
, host_set
);
5449 dev_printk(KERN_ERR
, dev
, "irq %lu request failed: %d\n",
5454 /* do we have a second IRQ for the other channel, eg legacy mode */
5456 /* We will get weird core code crashes later if this is true
5458 BUG_ON(ent
->irq
== ent
->irq2
);
5460 rc
= request_irq(ent
->irq2
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5461 DRV_NAME
, host_set
);
5463 dev_printk(KERN_ERR
, dev
, "irq %lu request failed: %d\n",
5465 goto err_out_free_irq
;
5469 /* perform each probe synchronously */
5470 DPRINTK("probe begin\n");
5471 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5472 struct ata_port
*ap
= host_set
->ports
[i
];
5476 /* init sata_spd_limit to the current value */
5477 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
5478 int spd
= (scontrol
>> 4) & 0xf;
5479 ap
->hw_sata_spd_limit
&= (1 << spd
) - 1;
5481 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5483 rc
= scsi_add_host(ap
->host
, dev
);
5485 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
5486 /* FIXME: do something useful here */
5487 /* FIXME: handle unconditional calls to
5488 * scsi_scan_host and ata_host_remove, below,
5493 if (ap
->ops
->error_handler
) {
5494 struct ata_eh_info
*ehi
= &ap
->eh_info
;
5495 unsigned long flags
;
5499 /* kick EH for boot probing */
5500 spin_lock_irqsave(ap
->lock
, flags
);
5502 ehi
->probe_mask
= (1 << ATA_MAX_DEVICES
) - 1;
5503 ehi
->action
|= ATA_EH_SOFTRESET
;
5504 ehi
->flags
|= ATA_EHI_NO_AUTOPSY
| ATA_EHI_QUIET
;
5506 ap
->pflags
|= ATA_PFLAG_LOADING
;
5507 ata_port_schedule_eh(ap
);
5509 spin_unlock_irqrestore(ap
->lock
, flags
);
5511 /* wait for EH to finish */
5512 ata_port_wait_eh(ap
);
5514 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5515 rc
= ata_bus_probe(ap
);
5516 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5519 /* FIXME: do something useful here?
5520 * Current libata behavior will
5521 * tear down everything when
5522 * the module is removed
5523 * or the h/w is unplugged.
5529 /* probes are done, now scan each port's disk(s) */
5530 DPRINTK("host probe begin\n");
5531 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5532 struct ata_port
*ap
= host_set
->ports
[i
];
5534 ata_scsi_scan_host(ap
);
5537 dev_set_drvdata(dev
, host_set
);
5539 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5540 return ent
->n_ports
; /* success */
5543 free_irq(ent
->irq
, host_set
);
5545 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5546 struct ata_port
*ap
= host_set
->ports
[i
];
5548 ap
->ops
->port_stop(ap
);
5549 scsi_host_put(ap
->host
);
5554 VPRINTK("EXIT, returning 0\n");
5559 * ata_port_detach - Detach ATA port in prepration of device removal
5560 * @ap: ATA port to be detached
5562 * Detach all ATA devices and the associated SCSI devices of @ap;
5563 * then, remove the associated SCSI host. @ap is guaranteed to
5564 * be quiescent on return from this function.
5567 * Kernel thread context (may sleep).
5569 void ata_port_detach(struct ata_port
*ap
)
5571 unsigned long flags
;
5574 if (!ap
->ops
->error_handler
)
5577 /* tell EH we're leaving & flush EH */
5578 spin_lock_irqsave(ap
->lock
, flags
);
5579 ap
->pflags
|= ATA_PFLAG_UNLOADING
;
5580 spin_unlock_irqrestore(ap
->lock
, flags
);
5582 ata_port_wait_eh(ap
);
5584 /* EH is now guaranteed to see UNLOADING, so no new device
5585 * will be attached. Disable all existing devices.
5587 spin_lock_irqsave(ap
->lock
, flags
);
5589 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
5590 ata_dev_disable(&ap
->device
[i
]);
5592 spin_unlock_irqrestore(ap
->lock
, flags
);
5594 /* Final freeze & EH. All in-flight commands are aborted. EH
5595 * will be skipped and retrials will be terminated with bad
5598 spin_lock_irqsave(ap
->lock
, flags
);
5599 ata_port_freeze(ap
); /* won't be thawed */
5600 spin_unlock_irqrestore(ap
->lock
, flags
);
5602 ata_port_wait_eh(ap
);
5604 /* Flush hotplug task. The sequence is similar to
5605 * ata_port_flush_task().
5607 flush_workqueue(ata_aux_wq
);
5608 cancel_delayed_work(&ap
->hotplug_task
);
5609 flush_workqueue(ata_aux_wq
);
5612 /* remove the associated SCSI host */
5613 scsi_remove_host(ap
->host
);
5617 * ata_host_set_remove - PCI layer callback for device removal
5618 * @host_set: ATA host set that was removed
5620 * Unregister all objects associated with this host set. Free those
5624 * Inherited from calling layer (may sleep).
5627 void ata_host_set_remove(struct ata_host_set
*host_set
)
5631 for (i
= 0; i
< host_set
->n_ports
; i
++)
5632 ata_port_detach(host_set
->ports
[i
]);
5634 free_irq(host_set
->irq
, host_set
);
5636 free_irq(host_set
->irq2
, host_set
);
5638 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5639 struct ata_port
*ap
= host_set
->ports
[i
];
5641 ata_scsi_release(ap
->host
);
5643 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5644 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5646 /* FIXME: Add -ac IDE pci mods to remove these special cases */
5647 if (ioaddr
->cmd_addr
== ATA_PRIMARY_CMD
)
5648 release_region(ATA_PRIMARY_CMD
, 8);
5649 else if (ioaddr
->cmd_addr
== ATA_SECONDARY_CMD
)
5650 release_region(ATA_SECONDARY_CMD
, 8);
5653 scsi_host_put(ap
->host
);
5656 if (host_set
->ops
->host_stop
)
5657 host_set
->ops
->host_stop(host_set
);
5663 * ata_scsi_release - SCSI layer callback hook for host unload
5664 * @host: libata host to be unloaded
5666 * Performs all duties necessary to shut down a libata port...
5667 * Kill port kthread, disable port, and release resources.
5670 * Inherited from SCSI layer.
5676 int ata_scsi_release(struct Scsi_Host
*host
)
5678 struct ata_port
*ap
= ata_shost_to_port(host
);
5682 ap
->ops
->port_disable(ap
);
5683 ap
->ops
->port_stop(ap
);
5689 struct ata_probe_ent
*
5690 ata_probe_ent_alloc(struct device
*dev
, const struct ata_port_info
*port
)
5692 struct ata_probe_ent
*probe_ent
;
5694 probe_ent
= kzalloc(sizeof(*probe_ent
), GFP_KERNEL
);
5696 printk(KERN_ERR DRV_NAME
"(%s): out of memory\n",
5697 kobject_name(&(dev
->kobj
)));
5701 INIT_LIST_HEAD(&probe_ent
->node
);
5702 probe_ent
->dev
= dev
;
5704 probe_ent
->sht
= port
->sht
;
5705 probe_ent
->host_flags
= port
->host_flags
;
5706 probe_ent
->pio_mask
= port
->pio_mask
;
5707 probe_ent
->mwdma_mask
= port
->mwdma_mask
;
5708 probe_ent
->udma_mask
= port
->udma_mask
;
5709 probe_ent
->port_ops
= port
->port_ops
;
5715 * ata_std_ports - initialize ioaddr with standard port offsets.
5716 * @ioaddr: IO address structure to be initialized
5718 * Utility function which initializes data_addr, error_addr,
5719 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5720 * device_addr, status_addr, and command_addr to standard offsets
5721 * relative to cmd_addr.
5723 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5726 void ata_std_ports(struct ata_ioports
*ioaddr
)
5728 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5729 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5730 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5731 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5732 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5733 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5734 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5735 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5736 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5737 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5743 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5745 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5747 pci_iounmap(pdev
, host_set
->mmio_base
);
5751 * ata_pci_remove_one - PCI layer callback for device removal
5752 * @pdev: PCI device that was removed
5754 * PCI layer indicates to libata via this hook that
5755 * hot-unplug or module unload event has occurred.
5756 * Handle this by unregistering all objects associated
5757 * with this PCI device. Free those objects. Then finally
5758 * release PCI resources and disable device.
5761 * Inherited from PCI layer (may sleep).
5764 void ata_pci_remove_one (struct pci_dev
*pdev
)
5766 struct device
*dev
= pci_dev_to_dev(pdev
);
5767 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5769 ata_host_set_remove(host_set
);
5771 pci_release_regions(pdev
);
5772 pci_disable_device(pdev
);
5773 dev_set_drvdata(dev
, NULL
);
5776 /* move to PCI subsystem */
5777 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5779 unsigned long tmp
= 0;
5781 switch (bits
->width
) {
5784 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5790 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5796 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5807 return (tmp
== bits
->val
) ? 1 : 0;
5810 void ata_pci_device_do_suspend(struct pci_dev
*pdev
, pm_message_t mesg
)
5812 pci_save_state(pdev
);
5814 if (mesg
.event
== PM_EVENT_SUSPEND
) {
5815 pci_disable_device(pdev
);
5816 pci_set_power_state(pdev
, PCI_D3hot
);
5820 void ata_pci_device_do_resume(struct pci_dev
*pdev
)
5822 pci_set_power_state(pdev
, PCI_D0
);
5823 pci_restore_state(pdev
);
5824 pci_enable_device(pdev
);
5825 pci_set_master(pdev
);
5828 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t mesg
)
5830 struct ata_host_set
*host_set
= dev_get_drvdata(&pdev
->dev
);
5833 rc
= ata_host_set_suspend(host_set
, mesg
);
5837 ata_pci_device_do_suspend(pdev
, mesg
);
5842 int ata_pci_device_resume(struct pci_dev
*pdev
)
5844 struct ata_host_set
*host_set
= dev_get_drvdata(&pdev
->dev
);
5846 ata_pci_device_do_resume(pdev
);
5847 ata_host_set_resume(host_set
);
5850 #endif /* CONFIG_PCI */
5853 static int __init
ata_init(void)
5855 ata_probe_timeout
*= HZ
;
5856 ata_wq
= create_workqueue("ata");
5860 ata_aux_wq
= create_singlethread_workqueue("ata_aux");
5862 destroy_workqueue(ata_wq
);
5866 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5870 static void __exit
ata_exit(void)
5872 destroy_workqueue(ata_wq
);
5873 destroy_workqueue(ata_aux_wq
);
5876 module_init(ata_init
);
5877 module_exit(ata_exit
);
5879 static unsigned long ratelimit_time
;
5880 static DEFINE_SPINLOCK(ata_ratelimit_lock
);
5882 int ata_ratelimit(void)
5885 unsigned long flags
;
5887 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5889 if (time_after(jiffies
, ratelimit_time
)) {
5891 ratelimit_time
= jiffies
+ (HZ
/5);
5895 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5901 * ata_wait_register - wait until register value changes
5902 * @reg: IO-mapped register
5903 * @mask: Mask to apply to read register value
5904 * @val: Wait condition
5905 * @interval_msec: polling interval in milliseconds
5906 * @timeout_msec: timeout in milliseconds
5908 * Waiting for some bits of register to change is a common
5909 * operation for ATA controllers. This function reads 32bit LE
5910 * IO-mapped register @reg and tests for the following condition.
5912 * (*@reg & mask) != val
5914 * If the condition is met, it returns; otherwise, the process is
5915 * repeated after @interval_msec until timeout.
5918 * Kernel thread context (may sleep)
5921 * The final register value.
5923 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5924 unsigned long interval_msec
,
5925 unsigned long timeout_msec
)
5927 unsigned long timeout
;
5930 tmp
= ioread32(reg
);
5932 /* Calculate timeout _after_ the first read to make sure
5933 * preceding writes reach the controller before starting to
5934 * eat away the timeout.
5936 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5938 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5939 msleep(interval_msec
);
5940 tmp
= ioread32(reg
);
5949 static void ata_dummy_noret(struct ata_port
*ap
) { }
5950 static int ata_dummy_ret0(struct ata_port
*ap
) { return 0; }
5951 static void ata_dummy_qc_noret(struct ata_queued_cmd
*qc
) { }
5953 static u8
ata_dummy_check_status(struct ata_port
*ap
)
5958 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd
*qc
)
5960 return AC_ERR_SYSTEM
;
5963 const struct ata_port_operations ata_dummy_port_ops
= {
5964 .port_disable
= ata_port_disable
,
5965 .check_status
= ata_dummy_check_status
,
5966 .check_altstatus
= ata_dummy_check_status
,
5967 .dev_select
= ata_noop_dev_select
,
5968 .qc_prep
= ata_noop_qc_prep
,
5969 .qc_issue
= ata_dummy_qc_issue
,
5970 .freeze
= ata_dummy_noret
,
5971 .thaw
= ata_dummy_noret
,
5972 .error_handler
= ata_dummy_noret
,
5973 .post_internal_cmd
= ata_dummy_qc_noret
,
5974 .irq_clear
= ata_dummy_noret
,
5975 .port_start
= ata_dummy_ret0
,
5976 .port_stop
= ata_dummy_noret
,
5980 * libata is essentially a library of internal helper functions for
5981 * low-level ATA host controller drivers. As such, the API/ABI is
5982 * likely to change as new drivers are added and updated.
5983 * Do not depend on ABI/API stability.
5986 EXPORT_SYMBOL_GPL(sata_deb_timing_normal
);
5987 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug
);
5988 EXPORT_SYMBOL_GPL(sata_deb_timing_long
);
5989 EXPORT_SYMBOL_GPL(ata_dummy_port_ops
);
5990 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5991 EXPORT_SYMBOL_GPL(ata_std_ports
);
5992 EXPORT_SYMBOL_GPL(ata_host_set_init
);
5993 EXPORT_SYMBOL_GPL(ata_device_add
);
5994 EXPORT_SYMBOL_GPL(ata_port_detach
);
5995 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5996 EXPORT_SYMBOL_GPL(ata_sg_init
);
5997 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5998 EXPORT_SYMBOL_GPL(ata_hsm_move
);
5999 EXPORT_SYMBOL_GPL(ata_qc_complete
);
6000 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple
);
6001 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
6002 EXPORT_SYMBOL_GPL(ata_tf_load
);
6003 EXPORT_SYMBOL_GPL(ata_tf_read
);
6004 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
6005 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
6006 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
6007 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
6008 EXPORT_SYMBOL_GPL(ata_check_status
);
6009 EXPORT_SYMBOL_GPL(ata_altstatus
);
6010 EXPORT_SYMBOL_GPL(ata_exec_command
);
6011 EXPORT_SYMBOL_GPL(ata_port_start
);
6012 EXPORT_SYMBOL_GPL(ata_port_stop
);
6013 EXPORT_SYMBOL_GPL(ata_host_stop
);
6014 EXPORT_SYMBOL_GPL(ata_interrupt
);
6015 EXPORT_SYMBOL_GPL(ata_mmio_data_xfer
);
6016 EXPORT_SYMBOL_GPL(ata_pio_data_xfer
);
6017 EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq
);
6018 EXPORT_SYMBOL_GPL(ata_qc_prep
);
6019 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
6020 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
6021 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
6022 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
6023 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
6024 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
6025 EXPORT_SYMBOL_GPL(ata_bmdma_freeze
);
6026 EXPORT_SYMBOL_GPL(ata_bmdma_thaw
);
6027 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh
);
6028 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler
);
6029 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd
);
6030 EXPORT_SYMBOL_GPL(ata_port_probe
);
6031 EXPORT_SYMBOL_GPL(sata_set_spd
);
6032 EXPORT_SYMBOL_GPL(sata_phy_debounce
);
6033 EXPORT_SYMBOL_GPL(sata_phy_resume
);
6034 EXPORT_SYMBOL_GPL(sata_phy_reset
);
6035 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
6036 EXPORT_SYMBOL_GPL(ata_bus_reset
);
6037 EXPORT_SYMBOL_GPL(ata_std_prereset
);
6038 EXPORT_SYMBOL_GPL(ata_std_softreset
);
6039 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
6040 EXPORT_SYMBOL_GPL(ata_std_postreset
);
6041 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
6042 EXPORT_SYMBOL_GPL(ata_dev_classify
);
6043 EXPORT_SYMBOL_GPL(ata_dev_pair
);
6044 EXPORT_SYMBOL_GPL(ata_port_disable
);
6045 EXPORT_SYMBOL_GPL(ata_ratelimit
);
6046 EXPORT_SYMBOL_GPL(ata_wait_register
);
6047 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
6048 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
6049 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
6050 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
6051 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
6052 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy
);
6053 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth
);
6054 EXPORT_SYMBOL_GPL(ata_scsi_release
);
6055 EXPORT_SYMBOL_GPL(ata_host_intr
);
6056 EXPORT_SYMBOL_GPL(sata_scr_valid
);
6057 EXPORT_SYMBOL_GPL(sata_scr_read
);
6058 EXPORT_SYMBOL_GPL(sata_scr_write
);
6059 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
6060 EXPORT_SYMBOL_GPL(ata_port_online
);
6061 EXPORT_SYMBOL_GPL(ata_port_offline
);
6062 EXPORT_SYMBOL_GPL(ata_host_set_suspend
);
6063 EXPORT_SYMBOL_GPL(ata_host_set_resume
);
6064 EXPORT_SYMBOL_GPL(ata_id_string
);
6065 EXPORT_SYMBOL_GPL(ata_id_c_string
);
6066 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
6068 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
6069 EXPORT_SYMBOL_GPL(ata_timing_compute
);
6070 EXPORT_SYMBOL_GPL(ata_timing_merge
);
6073 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
6074 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
6075 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
6076 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
6077 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
6078 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend
);
6079 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume
);
6080 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
6081 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
6082 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
6083 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
6084 #endif /* CONFIG_PCI */
6086 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
6087 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
6089 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
6090 EXPORT_SYMBOL_GPL(ata_port_schedule_eh
);
6091 EXPORT_SYMBOL_GPL(ata_port_abort
);
6092 EXPORT_SYMBOL_GPL(ata_port_freeze
);
6093 EXPORT_SYMBOL_GPL(ata_eh_freeze_port
);
6094 EXPORT_SYMBOL_GPL(ata_eh_thaw_port
);
6095 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
6096 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
6097 EXPORT_SYMBOL_GPL(ata_do_eh
);