2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 /* debounce timing parameters in msecs { interval, duration, timeout } */
65 const unsigned long sata_deb_timing_boot
[] = { 5, 100, 2000 };
66 const unsigned long sata_deb_timing_eh
[] = { 25, 500, 2000 };
67 const unsigned long sata_deb_timing_before_fsrst
[] = { 100, 2000, 5000 };
69 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
70 u16 heads
, u16 sectors
);
71 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
);
72 static void ata_dev_xfermask(struct ata_device
*dev
);
74 static unsigned int ata_unique_id
= 1;
75 static struct workqueue_struct
*ata_wq
;
77 struct workqueue_struct
*ata_aux_wq
;
79 int atapi_enabled
= 1;
80 module_param(atapi_enabled
, int, 0444);
81 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
84 module_param(atapi_dmadir
, int, 0444);
85 MODULE_PARM_DESC(atapi_dmadir
, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
88 module_param_named(fua
, libata_fua
, int, 0444);
89 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
91 MODULE_AUTHOR("Jeff Garzik");
92 MODULE_DESCRIPTION("Library module for ATA devices");
93 MODULE_LICENSE("GPL");
94 MODULE_VERSION(DRV_VERSION
);
98 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
99 * @tf: Taskfile to convert
100 * @fis: Buffer into which data will output
101 * @pmp: Port multiplier port
103 * Converts a standard ATA taskfile to a Serial ATA
104 * FIS structure (Register - Host to Device).
107 * Inherited from caller.
110 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
112 fis
[0] = 0x27; /* Register - Host to Device FIS */
113 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
114 bit 7 indicates Command FIS */
115 fis
[2] = tf
->command
;
116 fis
[3] = tf
->feature
;
123 fis
[8] = tf
->hob_lbal
;
124 fis
[9] = tf
->hob_lbam
;
125 fis
[10] = tf
->hob_lbah
;
126 fis
[11] = tf
->hob_feature
;
129 fis
[13] = tf
->hob_nsect
;
140 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
141 * @fis: Buffer from which data will be input
142 * @tf: Taskfile to output
144 * Converts a serial ATA FIS structure to a standard ATA taskfile.
147 * Inherited from caller.
150 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
152 tf
->command
= fis
[2]; /* status */
153 tf
->feature
= fis
[3]; /* error */
160 tf
->hob_lbal
= fis
[8];
161 tf
->hob_lbam
= fis
[9];
162 tf
->hob_lbah
= fis
[10];
165 tf
->hob_nsect
= fis
[13];
168 static const u8 ata_rw_cmds
[] = {
172 ATA_CMD_READ_MULTI_EXT
,
173 ATA_CMD_WRITE_MULTI_EXT
,
177 ATA_CMD_WRITE_MULTI_FUA_EXT
,
181 ATA_CMD_PIO_READ_EXT
,
182 ATA_CMD_PIO_WRITE_EXT
,
195 ATA_CMD_WRITE_FUA_EXT
199 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
200 * @qc: command to examine and configure
202 * Examine the device configuration and tf->flags to calculate
203 * the proper read/write commands and protocol to use.
208 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
210 struct ata_taskfile
*tf
= &qc
->tf
;
211 struct ata_device
*dev
= qc
->dev
;
214 int index
, fua
, lba48
, write
;
216 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
217 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
218 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
220 if (dev
->flags
& ATA_DFLAG_PIO
) {
221 tf
->protocol
= ATA_PROT_PIO
;
222 index
= dev
->multi_count
? 0 : 8;
223 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
224 /* Unable to use DMA due to host limitation */
225 tf
->protocol
= ATA_PROT_PIO
;
226 index
= dev
->multi_count
? 0 : 8;
228 tf
->protocol
= ATA_PROT_DMA
;
232 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
241 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
242 * @pio_mask: pio_mask
243 * @mwdma_mask: mwdma_mask
244 * @udma_mask: udma_mask
246 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
247 * unsigned int xfer_mask.
255 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
256 unsigned int mwdma_mask
,
257 unsigned int udma_mask
)
259 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
260 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
261 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
265 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
266 * @xfer_mask: xfer_mask to unpack
267 * @pio_mask: resulting pio_mask
268 * @mwdma_mask: resulting mwdma_mask
269 * @udma_mask: resulting udma_mask
271 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
272 * Any NULL distination masks will be ignored.
274 static void ata_unpack_xfermask(unsigned int xfer_mask
,
275 unsigned int *pio_mask
,
276 unsigned int *mwdma_mask
,
277 unsigned int *udma_mask
)
280 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
282 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
284 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
287 static const struct ata_xfer_ent
{
291 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
292 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
293 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
298 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
299 * @xfer_mask: xfer_mask of interest
301 * Return matching XFER_* value for @xfer_mask. Only the highest
302 * bit of @xfer_mask is considered.
308 * Matching XFER_* value, 0 if no match found.
310 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
312 int highbit
= fls(xfer_mask
) - 1;
313 const struct ata_xfer_ent
*ent
;
315 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
316 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
317 return ent
->base
+ highbit
- ent
->shift
;
322 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
323 * @xfer_mode: XFER_* of interest
325 * Return matching xfer_mask for @xfer_mode.
331 * Matching xfer_mask, 0 if no match found.
333 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
335 const struct ata_xfer_ent
*ent
;
337 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
338 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
339 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
344 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
345 * @xfer_mode: XFER_* of interest
347 * Return matching xfer_shift for @xfer_mode.
353 * Matching xfer_shift, -1 if no match found.
355 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
357 const struct ata_xfer_ent
*ent
;
359 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
360 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
366 * ata_mode_string - convert xfer_mask to string
367 * @xfer_mask: mask of bits supported; only highest bit counts.
369 * Determine string which represents the highest speed
370 * (highest bit in @modemask).
376 * Constant C string representing highest speed listed in
377 * @mode_mask, or the constant C string "<n/a>".
379 static const char *ata_mode_string(unsigned int xfer_mask
)
381 static const char * const xfer_mode_str
[] = {
401 highbit
= fls(xfer_mask
) - 1;
402 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
403 return xfer_mode_str
[highbit
];
407 static const char *sata_spd_string(unsigned int spd
)
409 static const char * const spd_str
[] = {
414 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
416 return spd_str
[spd
- 1];
419 void ata_dev_disable(struct ata_device
*dev
)
421 if (ata_dev_enabled(dev
)) {
422 ata_dev_printk(dev
, KERN_WARNING
, "disabled\n");
428 * ata_pio_devchk - PATA device presence detection
429 * @ap: ATA channel to examine
430 * @device: Device to examine (starting at zero)
432 * This technique was originally described in
433 * Hale Landis's ATADRVR (www.ata-atapi.com), and
434 * later found its way into the ATA/ATAPI spec.
436 * Write a pattern to the ATA shadow registers,
437 * and if a device is present, it will respond by
438 * correctly storing and echoing back the
439 * ATA shadow register contents.
445 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
448 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
451 ap
->ops
->dev_select(ap
, device
);
453 outb(0x55, ioaddr
->nsect_addr
);
454 outb(0xaa, ioaddr
->lbal_addr
);
456 outb(0xaa, ioaddr
->nsect_addr
);
457 outb(0x55, ioaddr
->lbal_addr
);
459 outb(0x55, ioaddr
->nsect_addr
);
460 outb(0xaa, ioaddr
->lbal_addr
);
462 nsect
= inb(ioaddr
->nsect_addr
);
463 lbal
= inb(ioaddr
->lbal_addr
);
465 if ((nsect
== 0x55) && (lbal
== 0xaa))
466 return 1; /* we found a device */
468 return 0; /* nothing found */
472 * ata_mmio_devchk - PATA device presence detection
473 * @ap: ATA channel to examine
474 * @device: Device to examine (starting at zero)
476 * This technique was originally described in
477 * Hale Landis's ATADRVR (www.ata-atapi.com), and
478 * later found its way into the ATA/ATAPI spec.
480 * Write a pattern to the ATA shadow registers,
481 * and if a device is present, it will respond by
482 * correctly storing and echoing back the
483 * ATA shadow register contents.
489 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
492 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
495 ap
->ops
->dev_select(ap
, device
);
497 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
498 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
500 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
501 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
503 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
504 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
506 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
507 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
509 if ((nsect
== 0x55) && (lbal
== 0xaa))
510 return 1; /* we found a device */
512 return 0; /* nothing found */
516 * ata_devchk - PATA device presence detection
517 * @ap: ATA channel to examine
518 * @device: Device to examine (starting at zero)
520 * Dispatch ATA device presence detection, depending
521 * on whether we are using PIO or MMIO to talk to the
522 * ATA shadow registers.
528 static unsigned int ata_devchk(struct ata_port
*ap
,
531 if (ap
->flags
& ATA_FLAG_MMIO
)
532 return ata_mmio_devchk(ap
, device
);
533 return ata_pio_devchk(ap
, device
);
537 * ata_dev_classify - determine device type based on ATA-spec signature
538 * @tf: ATA taskfile register set for device to be identified
540 * Determine from taskfile register contents whether a device is
541 * ATA or ATAPI, as per "Signature and persistence" section
542 * of ATA/PI spec (volume 1, sect 5.14).
548 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
549 * the event of failure.
552 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
554 /* Apple's open source Darwin code hints that some devices only
555 * put a proper signature into the LBA mid/high registers,
556 * So, we only check those. It's sufficient for uniqueness.
559 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
560 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
561 DPRINTK("found ATA device by sig\n");
565 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
566 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
567 DPRINTK("found ATAPI device by sig\n");
568 return ATA_DEV_ATAPI
;
571 DPRINTK("unknown device\n");
572 return ATA_DEV_UNKNOWN
;
576 * ata_dev_try_classify - Parse returned ATA device signature
577 * @ap: ATA channel to examine
578 * @device: Device to examine (starting at zero)
579 * @r_err: Value of error register on completion
581 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
582 * an ATA/ATAPI-defined set of values is placed in the ATA
583 * shadow registers, indicating the results of device detection
586 * Select the ATA device, and read the values from the ATA shadow
587 * registers. Then parse according to the Error register value,
588 * and the spec-defined values examined by ata_dev_classify().
594 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
598 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
600 struct ata_taskfile tf
;
604 ap
->ops
->dev_select(ap
, device
);
606 memset(&tf
, 0, sizeof(tf
));
608 ap
->ops
->tf_read(ap
, &tf
);
613 /* see if device passed diags */
616 else if ((device
== 0) && (err
== 0x81))
621 /* determine if device is ATA or ATAPI */
622 class = ata_dev_classify(&tf
);
624 if (class == ATA_DEV_UNKNOWN
)
626 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
632 * ata_id_string - Convert IDENTIFY DEVICE page into string
633 * @id: IDENTIFY DEVICE results we will examine
634 * @s: string into which data is output
635 * @ofs: offset into identify device page
636 * @len: length of string to return. must be an even number.
638 * The strings in the IDENTIFY DEVICE page are broken up into
639 * 16-bit chunks. Run through the string, and output each
640 * 8-bit chunk linearly, regardless of platform.
646 void ata_id_string(const u16
*id
, unsigned char *s
,
647 unsigned int ofs
, unsigned int len
)
666 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
667 * @id: IDENTIFY DEVICE results we will examine
668 * @s: string into which data is output
669 * @ofs: offset into identify device page
670 * @len: length of string to return. must be an odd number.
672 * This function is identical to ata_id_string except that it
673 * trims trailing spaces and terminates the resulting string with
674 * null. @len must be actual maximum length (even number) + 1.
679 void ata_id_c_string(const u16
*id
, unsigned char *s
,
680 unsigned int ofs
, unsigned int len
)
686 ata_id_string(id
, s
, ofs
, len
- 1);
688 p
= s
+ strnlen(s
, len
- 1);
689 while (p
> s
&& p
[-1] == ' ')
694 static u64
ata_id_n_sectors(const u16
*id
)
696 if (ata_id_has_lba(id
)) {
697 if (ata_id_has_lba48(id
))
698 return ata_id_u64(id
, 100);
700 return ata_id_u32(id
, 60);
702 if (ata_id_current_chs_valid(id
))
703 return ata_id_u32(id
, 57);
705 return id
[1] * id
[3] * id
[6];
710 * ata_noop_dev_select - Select device 0/1 on ATA bus
711 * @ap: ATA channel to manipulate
712 * @device: ATA device (numbered from zero) to select
714 * This function performs no actual function.
716 * May be used as the dev_select() entry in ata_port_operations.
721 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
727 * ata_std_dev_select - Select device 0/1 on ATA bus
728 * @ap: ATA channel to manipulate
729 * @device: ATA device (numbered from zero) to select
731 * Use the method defined in the ATA specification to
732 * make either device 0, or device 1, active on the
733 * ATA channel. Works with both PIO and MMIO.
735 * May be used as the dev_select() entry in ata_port_operations.
741 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
746 tmp
= ATA_DEVICE_OBS
;
748 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
750 if (ap
->flags
& ATA_FLAG_MMIO
) {
751 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
753 outb(tmp
, ap
->ioaddr
.device_addr
);
755 ata_pause(ap
); /* needed; also flushes, for mmio */
759 * ata_dev_select - Select device 0/1 on ATA bus
760 * @ap: ATA channel to manipulate
761 * @device: ATA device (numbered from zero) to select
762 * @wait: non-zero to wait for Status register BSY bit to clear
763 * @can_sleep: non-zero if context allows sleeping
765 * Use the method defined in the ATA specification to
766 * make either device 0, or device 1, active on the
769 * This is a high-level version of ata_std_dev_select(),
770 * which additionally provides the services of inserting
771 * the proper pauses and status polling, where needed.
777 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
778 unsigned int wait
, unsigned int can_sleep
)
780 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
781 ap
->id
, device
, wait
);
786 ap
->ops
->dev_select(ap
, device
);
789 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
796 * ata_dump_id - IDENTIFY DEVICE info debugging output
797 * @id: IDENTIFY DEVICE page to dump
799 * Dump selected 16-bit words from the given IDENTIFY DEVICE
806 static inline void ata_dump_id(const u16
*id
)
808 DPRINTK("49==0x%04x "
818 DPRINTK("80==0x%04x "
828 DPRINTK("88==0x%04x "
835 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
836 * @id: IDENTIFY data to compute xfer mask from
838 * Compute the xfermask for this device. This is not as trivial
839 * as it seems if we must consider early devices correctly.
841 * FIXME: pre IDE drive timing (do we care ?).
849 static unsigned int ata_id_xfermask(const u16
*id
)
851 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
853 /* Usual case. Word 53 indicates word 64 is valid */
854 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
855 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
859 /* If word 64 isn't valid then Word 51 high byte holds
860 * the PIO timing number for the maximum. Turn it into
863 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
865 /* But wait.. there's more. Design your standards by
866 * committee and you too can get a free iordy field to
867 * process. However its the speeds not the modes that
868 * are supported... Note drivers using the timing API
869 * will get this right anyway
873 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
876 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
877 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
879 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
883 * ata_port_queue_task - Queue port_task
884 * @ap: The ata_port to queue port_task for
885 * @fn: workqueue function to be scheduled
886 * @data: data value to pass to workqueue function
887 * @delay: delay time for workqueue function
889 * Schedule @fn(@data) for execution after @delay jiffies using
890 * port_task. There is one port_task per port and it's the
891 * user(low level driver)'s responsibility to make sure that only
892 * one task is active at any given time.
894 * libata core layer takes care of synchronization between
895 * port_task and EH. ata_port_queue_task() may be ignored for EH
899 * Inherited from caller.
901 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
906 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
909 PREPARE_WORK(&ap
->port_task
, fn
, data
);
912 rc
= queue_work(ata_wq
, &ap
->port_task
);
914 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
916 /* rc == 0 means that another user is using port task */
921 * ata_port_flush_task - Flush port_task
922 * @ap: The ata_port to flush port_task for
924 * After this function completes, port_task is guranteed not to
925 * be running or scheduled.
928 * Kernel thread context (may sleep)
930 void ata_port_flush_task(struct ata_port
*ap
)
936 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
937 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
938 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
940 DPRINTK("flush #1\n");
941 flush_workqueue(ata_wq
);
944 * At this point, if a task is running, it's guaranteed to see
945 * the FLUSH flag; thus, it will never queue pio tasks again.
948 if (!cancel_delayed_work(&ap
->port_task
)) {
949 DPRINTK("flush #2\n");
950 flush_workqueue(ata_wq
);
953 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
954 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
955 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
960 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
962 struct completion
*waiting
= qc
->private_data
;
968 * ata_exec_internal - execute libata internal command
969 * @dev: Device to which the command is sent
970 * @tf: Taskfile registers for the command and the result
971 * @cdb: CDB for packet command
972 * @dma_dir: Data tranfer direction of the command
973 * @buf: Data buffer of the command
974 * @buflen: Length of data buffer
976 * Executes libata internal command with timeout. @tf contains
977 * command on entry and result on return. Timeout and error
978 * conditions are reported via return value. No recovery action
979 * is taken after a command times out. It's caller's duty to
980 * clean up after timeout.
983 * None. Should be called with kernel context, might sleep.
986 unsigned ata_exec_internal(struct ata_device
*dev
,
987 struct ata_taskfile
*tf
, const u8
*cdb
,
988 int dma_dir
, void *buf
, unsigned int buflen
)
990 struct ata_port
*ap
= dev
->ap
;
991 u8 command
= tf
->command
;
992 struct ata_queued_cmd
*qc
;
993 unsigned int tag
, preempted_tag
;
994 u32 preempted_sactive
, preempted_qc_active
;
995 DECLARE_COMPLETION(wait
);
997 unsigned int err_mask
;
1000 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1002 /* no internal command while frozen */
1003 if (ap
->flags
& ATA_FLAG_FROZEN
) {
1004 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1005 return AC_ERR_SYSTEM
;
1008 /* initialize internal qc */
1010 /* XXX: Tag 0 is used for drivers with legacy EH as some
1011 * drivers choke if any other tag is given. This breaks
1012 * ata_tag_internal() test for those drivers. Don't use new
1013 * EH stuff without converting to it.
1015 if (ap
->ops
->error_handler
)
1016 tag
= ATA_TAG_INTERNAL
;
1020 if (test_and_set_bit(tag
, &ap
->qc_allocated
))
1022 qc
= __ata_qc_from_tag(ap
, tag
);
1030 preempted_tag
= ap
->active_tag
;
1031 preempted_sactive
= ap
->sactive
;
1032 preempted_qc_active
= ap
->qc_active
;
1033 ap
->active_tag
= ATA_TAG_POISON
;
1037 /* prepare & issue qc */
1040 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1041 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1042 qc
->dma_dir
= dma_dir
;
1043 if (dma_dir
!= DMA_NONE
) {
1044 ata_sg_init_one(qc
, buf
, buflen
);
1045 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1048 qc
->private_data
= &wait
;
1049 qc
->complete_fn
= ata_qc_complete_internal
;
1053 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1055 rc
= wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
);
1057 ata_port_flush_task(ap
);
1060 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1062 /* We're racing with irq here. If we lose, the
1063 * following test prevents us from completing the qc
1064 * twice. If we win, the port is frozen and will be
1065 * cleaned up by ->post_internal_cmd().
1067 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1068 qc
->err_mask
|= AC_ERR_TIMEOUT
;
1070 if (ap
->ops
->error_handler
)
1071 ata_port_freeze(ap
);
1073 ata_qc_complete(qc
);
1075 ata_dev_printk(dev
, KERN_WARNING
,
1076 "qc timeout (cmd 0x%x)\n", command
);
1079 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1082 /* do post_internal_cmd */
1083 if (ap
->ops
->post_internal_cmd
)
1084 ap
->ops
->post_internal_cmd(qc
);
1086 if (qc
->flags
& ATA_QCFLAG_FAILED
&& !qc
->err_mask
) {
1087 ata_dev_printk(dev
, KERN_WARNING
, "zero err_mask for failed "
1088 "internal command, assuming AC_ERR_OTHER\n");
1089 qc
->err_mask
|= AC_ERR_OTHER
;
1093 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1095 *tf
= qc
->result_tf
;
1096 err_mask
= qc
->err_mask
;
1099 ap
->active_tag
= preempted_tag
;
1100 ap
->sactive
= preempted_sactive
;
1101 ap
->qc_active
= preempted_qc_active
;
1103 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1104 * Until those drivers are fixed, we detect the condition
1105 * here, fail the command with AC_ERR_SYSTEM and reenable the
1108 * Note that this doesn't change any behavior as internal
1109 * command failure results in disabling the device in the
1110 * higher layer for LLDDs without new reset/EH callbacks.
1112 * Kill the following code as soon as those drivers are fixed.
1114 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1115 err_mask
|= AC_ERR_SYSTEM
;
1119 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1125 * ata_pio_need_iordy - check if iordy needed
1128 * Check if the current speed of the device requires IORDY. Used
1129 * by various controllers for chip configuration.
1132 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1135 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1142 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1144 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1145 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1146 /* Is the speed faster than the drive allows non IORDY ? */
1148 /* This is cycle times not frequency - watch the logic! */
1149 if (pio
> 240) /* PIO2 is 240nS per cycle */
1158 * ata_dev_read_id - Read ID data from the specified device
1159 * @dev: target device
1160 * @p_class: pointer to class of the target device (may be changed)
1161 * @post_reset: is this read ID post-reset?
1162 * @id: buffer to read IDENTIFY data into
1164 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1165 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1166 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1167 * for pre-ATA4 drives.
1170 * Kernel thread context (may sleep)
1173 * 0 on success, -errno otherwise.
1175 int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1176 int post_reset
, u16
*id
)
1178 struct ata_port
*ap
= dev
->ap
;
1179 unsigned int class = *p_class
;
1180 struct ata_taskfile tf
;
1181 unsigned int err_mask
= 0;
1185 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1187 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1190 ata_tf_init(dev
, &tf
);
1194 tf
.command
= ATA_CMD_ID_ATA
;
1197 tf
.command
= ATA_CMD_ID_ATAPI
;
1201 reason
= "unsupported class";
1205 tf
.protocol
= ATA_PROT_PIO
;
1207 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1208 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1211 reason
= "I/O error";
1215 swap_buf_le16(id
, ATA_ID_WORDS
);
1218 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1220 reason
= "device reports illegal type";
1224 if (post_reset
&& class == ATA_DEV_ATA
) {
1226 * The exact sequence expected by certain pre-ATA4 drives is:
1229 * INITIALIZE DEVICE PARAMETERS
1231 * Some drives were very specific about that exact sequence.
1233 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1234 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1237 reason
= "INIT_DEV_PARAMS failed";
1241 /* current CHS translation info (id[53-58]) might be
1242 * changed. reread the identify device info.
1254 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1255 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1259 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1261 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1264 static void ata_dev_config_ncq(struct ata_device
*dev
,
1265 char *desc
, size_t desc_sz
)
1267 struct ata_port
*ap
= dev
->ap
;
1268 int hdepth
= 0, ddepth
= ata_id_queue_depth(dev
->id
);
1270 if (!ata_id_has_ncq(dev
->id
)) {
1275 if (ap
->flags
& ATA_FLAG_NCQ
) {
1276 hdepth
= min(ap
->host
->can_queue
, ATA_MAX_QUEUE
- 1);
1277 dev
->flags
|= ATA_DFLAG_NCQ
;
1280 if (hdepth
>= ddepth
)
1281 snprintf(desc
, desc_sz
, "NCQ (depth %d)", ddepth
);
1283 snprintf(desc
, desc_sz
, "NCQ (depth %d/%d)", hdepth
, ddepth
);
1287 * ata_dev_configure - Configure the specified ATA/ATAPI device
1288 * @dev: Target device to configure
1289 * @print_info: Enable device info printout
1291 * Configure @dev according to @dev->id. Generic and low-level
1292 * driver specific fixups are also applied.
1295 * Kernel thread context (may sleep)
1298 * 0 on success, -errno otherwise
1300 int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1302 struct ata_port
*ap
= dev
->ap
;
1303 const u16
*id
= dev
->id
;
1304 unsigned int xfer_mask
;
1307 if (!ata_dev_enabled(dev
)) {
1308 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1309 ap
->id
, dev
->devno
);
1313 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1315 /* print device capabilities */
1317 ata_dev_printk(dev
, KERN_DEBUG
, "cfg 49:%04x 82:%04x 83:%04x "
1318 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1319 id
[49], id
[82], id
[83], id
[84],
1320 id
[85], id
[86], id
[87], id
[88]);
1322 /* initialize to-be-configured parameters */
1323 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1324 dev
->max_sectors
= 0;
1332 * common ATA, ATAPI feature tests
1335 /* find max transfer mode; for printk only */
1336 xfer_mask
= ata_id_xfermask(id
);
1340 /* ATA-specific feature tests */
1341 if (dev
->class == ATA_DEV_ATA
) {
1342 dev
->n_sectors
= ata_id_n_sectors(id
);
1344 if (ata_id_has_lba(id
)) {
1345 const char *lba_desc
;
1349 dev
->flags
|= ATA_DFLAG_LBA
;
1350 if (ata_id_has_lba48(id
)) {
1351 dev
->flags
|= ATA_DFLAG_LBA48
;
1356 ata_dev_config_ncq(dev
, ncq_desc
, sizeof(ncq_desc
));
1358 /* print device info to dmesg */
1360 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1361 "max %s, %Lu sectors: %s %s\n",
1362 ata_id_major_version(id
),
1363 ata_mode_string(xfer_mask
),
1364 (unsigned long long)dev
->n_sectors
,
1365 lba_desc
, ncq_desc
);
1369 /* Default translation */
1370 dev
->cylinders
= id
[1];
1372 dev
->sectors
= id
[6];
1374 if (ata_id_current_chs_valid(id
)) {
1375 /* Current CHS translation is valid. */
1376 dev
->cylinders
= id
[54];
1377 dev
->heads
= id
[55];
1378 dev
->sectors
= id
[56];
1381 /* print device info to dmesg */
1383 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1384 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1385 ata_id_major_version(id
),
1386 ata_mode_string(xfer_mask
),
1387 (unsigned long long)dev
->n_sectors
,
1388 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1391 if (dev
->id
[59] & 0x100) {
1392 dev
->multi_count
= dev
->id
[59] & 0xff;
1393 DPRINTK("ata%u: dev %u multi count %u\n",
1394 ap
->id
, dev
->devno
, dev
->multi_count
);
1400 /* ATAPI-specific feature tests */
1401 else if (dev
->class == ATA_DEV_ATAPI
) {
1402 char *cdb_intr_string
= "";
1404 rc
= atapi_cdb_len(id
);
1405 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1406 ata_dev_printk(dev
, KERN_WARNING
,
1407 "unsupported CDB len\n");
1411 dev
->cdb_len
= (unsigned int) rc
;
1413 if (ata_id_cdb_intr(dev
->id
)) {
1414 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1415 cdb_intr_string
= ", CDB intr";
1418 /* print device info to dmesg */
1420 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s%s\n",
1421 ata_mode_string(xfer_mask
),
1425 ap
->host
->max_cmd_len
= 0;
1426 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1427 ap
->host
->max_cmd_len
= max_t(unsigned int,
1428 ap
->host
->max_cmd_len
,
1429 ap
->device
[i
].cdb_len
);
1431 /* limit bridge transfers to udma5, 200 sectors */
1432 if (ata_dev_knobble(dev
)) {
1434 ata_dev_printk(dev
, KERN_INFO
,
1435 "applying bridge limits\n");
1436 dev
->udma_mask
&= ATA_UDMA5
;
1437 dev
->max_sectors
= ATA_MAX_SECTORS
;
1440 if (ap
->ops
->dev_config
)
1441 ap
->ops
->dev_config(ap
, dev
);
1443 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1447 DPRINTK("EXIT, err\n");
1452 * ata_bus_probe - Reset and probe ATA bus
1455 * Master ATA bus probing function. Initiates a hardware-dependent
1456 * bus reset, then attempts to identify any devices found on
1460 * PCI/etc. bus probe sem.
1463 * Zero on success, negative errno otherwise.
1466 static int ata_bus_probe(struct ata_port
*ap
)
1468 unsigned int classes
[ATA_MAX_DEVICES
];
1469 int tries
[ATA_MAX_DEVICES
];
1470 int i
, rc
, down_xfermask
;
1471 struct ata_device
*dev
;
1475 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1476 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1481 /* reset and determine device classes */
1482 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1483 classes
[i
] = ATA_DEV_UNKNOWN
;
1485 if (ap
->ops
->probe_reset
) {
1486 rc
= ap
->ops
->probe_reset(ap
, classes
);
1488 ata_port_printk(ap
, KERN_ERR
,
1489 "reset failed (errno=%d)\n", rc
);
1493 ap
->ops
->phy_reset(ap
);
1495 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1496 if (!(ap
->flags
& ATA_FLAG_DISABLED
))
1497 classes
[i
] = ap
->device
[i
].class;
1498 ap
->device
[i
].class = ATA_DEV_UNKNOWN
;
1504 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1505 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1506 classes
[i
] = ATA_DEV_NONE
;
1508 /* after the reset the device state is PIO 0 and the controller
1509 state is undefined. Record the mode */
1511 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1512 ap
->device
[i
].pio_mode
= XFER_PIO_0
;
1514 /* read IDENTIFY page and configure devices */
1515 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1516 dev
= &ap
->device
[i
];
1519 dev
->class = classes
[i
];
1521 if (!ata_dev_enabled(dev
))
1524 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1528 rc
= ata_dev_configure(dev
, 1);
1533 /* configure transfer mode */
1534 rc
= ata_set_mode(ap
, &dev
);
1540 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1541 if (ata_dev_enabled(&ap
->device
[i
]))
1544 /* no device present, disable port */
1545 ata_port_disable(ap
);
1546 ap
->ops
->port_disable(ap
);
1553 tries
[dev
->devno
] = 0;
1556 sata_down_spd_limit(ap
);
1559 tries
[dev
->devno
]--;
1560 if (down_xfermask
&&
1561 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1562 tries
[dev
->devno
] = 0;
1565 if (!tries
[dev
->devno
]) {
1566 ata_down_xfermask_limit(dev
, 1);
1567 ata_dev_disable(dev
);
1574 * ata_port_probe - Mark port as enabled
1575 * @ap: Port for which we indicate enablement
1577 * Modify @ap data structure such that the system
1578 * thinks that the entire port is enabled.
1580 * LOCKING: host_set lock, or some other form of
1584 void ata_port_probe(struct ata_port
*ap
)
1586 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1590 * sata_print_link_status - Print SATA link status
1591 * @ap: SATA port to printk link status about
1593 * This function prints link speed and status of a SATA link.
1598 static void sata_print_link_status(struct ata_port
*ap
)
1600 u32 sstatus
, scontrol
, tmp
;
1602 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1604 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1606 if (ata_port_online(ap
)) {
1607 tmp
= (sstatus
>> 4) & 0xf;
1608 ata_port_printk(ap
, KERN_INFO
,
1609 "SATA link up %s (SStatus %X SControl %X)\n",
1610 sata_spd_string(tmp
), sstatus
, scontrol
);
1612 ata_port_printk(ap
, KERN_INFO
,
1613 "SATA link down (SStatus %X SControl %X)\n",
1619 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1620 * @ap: SATA port associated with target SATA PHY.
1622 * This function issues commands to standard SATA Sxxx
1623 * PHY registers, to wake up the phy (and device), and
1624 * clear any reset condition.
1627 * PCI/etc. bus probe sem.
1630 void __sata_phy_reset(struct ata_port
*ap
)
1633 unsigned long timeout
= jiffies
+ (HZ
* 5);
1635 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1636 /* issue phy wake/reset */
1637 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1638 /* Couldn't find anything in SATA I/II specs, but
1639 * AHCI-1.1 10.4.2 says at least 1 ms. */
1642 /* phy wake/clear reset */
1643 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1645 /* wait for phy to become ready, if necessary */
1648 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1649 if ((sstatus
& 0xf) != 1)
1651 } while (time_before(jiffies
, timeout
));
1653 /* print link status */
1654 sata_print_link_status(ap
);
1656 /* TODO: phy layer with polling, timeouts, etc. */
1657 if (!ata_port_offline(ap
))
1660 ata_port_disable(ap
);
1662 if (ap
->flags
& ATA_FLAG_DISABLED
)
1665 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1666 ata_port_disable(ap
);
1670 ap
->cbl
= ATA_CBL_SATA
;
1674 * sata_phy_reset - Reset SATA bus.
1675 * @ap: SATA port associated with target SATA PHY.
1677 * This function resets the SATA bus, and then probes
1678 * the bus for devices.
1681 * PCI/etc. bus probe sem.
1684 void sata_phy_reset(struct ata_port
*ap
)
1686 __sata_phy_reset(ap
);
1687 if (ap
->flags
& ATA_FLAG_DISABLED
)
1693 * ata_dev_pair - return other device on cable
1696 * Obtain the other device on the same cable, or if none is
1697 * present NULL is returned
1700 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1702 struct ata_port
*ap
= adev
->ap
;
1703 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1704 if (!ata_dev_enabled(pair
))
1710 * ata_port_disable - Disable port.
1711 * @ap: Port to be disabled.
1713 * Modify @ap data structure such that the system
1714 * thinks that the entire port is disabled, and should
1715 * never attempt to probe or communicate with devices
1718 * LOCKING: host_set lock, or some other form of
1722 void ata_port_disable(struct ata_port
*ap
)
1724 ap
->device
[0].class = ATA_DEV_NONE
;
1725 ap
->device
[1].class = ATA_DEV_NONE
;
1726 ap
->flags
|= ATA_FLAG_DISABLED
;
1730 * sata_down_spd_limit - adjust SATA spd limit downward
1731 * @ap: Port to adjust SATA spd limit for
1733 * Adjust SATA spd limit of @ap downward. Note that this
1734 * function only adjusts the limit. The change must be applied
1735 * using sata_set_spd().
1738 * Inherited from caller.
1741 * 0 on success, negative errno on failure
1743 int sata_down_spd_limit(struct ata_port
*ap
)
1745 u32 sstatus
, spd
, mask
;
1748 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1752 mask
= ap
->sata_spd_limit
;
1755 highbit
= fls(mask
) - 1;
1756 mask
&= ~(1 << highbit
);
1758 spd
= (sstatus
>> 4) & 0xf;
1762 mask
&= (1 << spd
) - 1;
1766 ap
->sata_spd_limit
= mask
;
1768 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1769 sata_spd_string(fls(mask
)));
1774 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1778 if (ap
->sata_spd_limit
== UINT_MAX
)
1781 limit
= fls(ap
->sata_spd_limit
);
1783 spd
= (*scontrol
>> 4) & 0xf;
1784 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1786 return spd
!= limit
;
1790 * sata_set_spd_needed - is SATA spd configuration needed
1791 * @ap: Port in question
1793 * Test whether the spd limit in SControl matches
1794 * @ap->sata_spd_limit. This function is used to determine
1795 * whether hardreset is necessary to apply SATA spd
1799 * Inherited from caller.
1802 * 1 if SATA spd configuration is needed, 0 otherwise.
1804 int sata_set_spd_needed(struct ata_port
*ap
)
1808 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1811 return __sata_set_spd_needed(ap
, &scontrol
);
1815 * sata_set_spd - set SATA spd according to spd limit
1816 * @ap: Port to set SATA spd for
1818 * Set SATA spd of @ap according to sata_spd_limit.
1821 * Inherited from caller.
1824 * 0 if spd doesn't need to be changed, 1 if spd has been
1825 * changed. Negative errno if SCR registers are inaccessible.
1827 int sata_set_spd(struct ata_port
*ap
)
1832 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1835 if (!__sata_set_spd_needed(ap
, &scontrol
))
1838 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1845 * This mode timing computation functionality is ported over from
1846 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1849 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1850 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1851 * for PIO 5, which is a nonstandard extension and UDMA6, which
1852 * is currently supported only by Maxtor drives.
1855 static const struct ata_timing ata_timing
[] = {
1857 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1858 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1859 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1860 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1862 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1863 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1864 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1866 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1868 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1869 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1870 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1872 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1873 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1874 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1876 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1877 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1878 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1880 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1881 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1882 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1884 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1889 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1890 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1892 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1894 q
->setup
= EZ(t
->setup
* 1000, T
);
1895 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1896 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1897 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1898 q
->active
= EZ(t
->active
* 1000, T
);
1899 q
->recover
= EZ(t
->recover
* 1000, T
);
1900 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1901 q
->udma
= EZ(t
->udma
* 1000, UT
);
1904 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1905 struct ata_timing
*m
, unsigned int what
)
1907 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1908 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1909 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1910 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1911 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1912 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1913 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1914 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1917 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1919 const struct ata_timing
*t
;
1921 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1922 if (t
->mode
== 0xFF)
1927 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1928 struct ata_timing
*t
, int T
, int UT
)
1930 const struct ata_timing
*s
;
1931 struct ata_timing p
;
1937 if (!(s
= ata_timing_find_mode(speed
)))
1940 memcpy(t
, s
, sizeof(*s
));
1943 * If the drive is an EIDE drive, it can tell us it needs extended
1944 * PIO/MW_DMA cycle timing.
1947 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1948 memset(&p
, 0, sizeof(p
));
1949 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1950 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1951 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1952 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1953 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1955 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1959 * Convert the timing to bus clock counts.
1962 ata_timing_quantize(t
, t
, T
, UT
);
1965 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1966 * S.M.A.R.T * and some other commands. We have to ensure that the
1967 * DMA cycle timing is slower/equal than the fastest PIO timing.
1970 if (speed
> XFER_PIO_4
) {
1971 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1972 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1976 * Lengthen active & recovery time so that cycle time is correct.
1979 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1980 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1981 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1984 if (t
->active
+ t
->recover
< t
->cycle
) {
1985 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1986 t
->recover
= t
->cycle
- t
->active
;
1993 * ata_down_xfermask_limit - adjust dev xfer masks downward
1994 * @dev: Device to adjust xfer masks
1995 * @force_pio0: Force PIO0
1997 * Adjust xfer masks of @dev downward. Note that this function
1998 * does not apply the change. Invoking ata_set_mode() afterwards
1999 * will apply the limit.
2002 * Inherited from caller.
2005 * 0 on success, negative errno on failure
2007 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
2009 unsigned long xfer_mask
;
2012 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
2017 /* don't gear down to MWDMA from UDMA, go directly to PIO */
2018 if (xfer_mask
& ATA_MASK_UDMA
)
2019 xfer_mask
&= ~ATA_MASK_MWDMA
;
2021 highbit
= fls(xfer_mask
) - 1;
2022 xfer_mask
&= ~(1 << highbit
);
2024 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
2028 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2031 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
2032 ata_mode_string(xfer_mask
));
2040 static int ata_dev_set_mode(struct ata_device
*dev
)
2042 unsigned int err_mask
;
2045 dev
->flags
&= ~ATA_DFLAG_PIO
;
2046 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
2047 dev
->flags
|= ATA_DFLAG_PIO
;
2049 err_mask
= ata_dev_set_xfermode(dev
);
2051 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
2052 "(err_mask=0x%x)\n", err_mask
);
2056 rc
= ata_dev_revalidate(dev
, 0);
2060 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
2061 dev
->xfer_shift
, (int)dev
->xfer_mode
);
2063 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
2064 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
2069 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2070 * @ap: port on which timings will be programmed
2071 * @r_failed_dev: out paramter for failed device
2073 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2074 * ata_set_mode() fails, pointer to the failing device is
2075 * returned in @r_failed_dev.
2078 * PCI/etc. bus probe sem.
2081 * 0 on success, negative errno otherwise
2083 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2085 struct ata_device
*dev
;
2086 int i
, rc
= 0, used_dma
= 0, found
= 0;
2088 /* has private set_mode? */
2089 if (ap
->ops
->set_mode
) {
2090 /* FIXME: make ->set_mode handle no device case and
2091 * return error code and failing device on failure.
2093 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2094 if (ata_dev_enabled(&ap
->device
[i
])) {
2095 ap
->ops
->set_mode(ap
);
2102 /* step 1: calculate xfer_mask */
2103 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2104 unsigned int pio_mask
, dma_mask
;
2106 dev
= &ap
->device
[i
];
2108 if (!ata_dev_enabled(dev
))
2111 ata_dev_xfermask(dev
);
2113 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2114 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2115 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2116 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2125 /* step 2: always set host PIO timings */
2126 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2127 dev
= &ap
->device
[i
];
2128 if (!ata_dev_enabled(dev
))
2131 if (!dev
->pio_mode
) {
2132 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2137 dev
->xfer_mode
= dev
->pio_mode
;
2138 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2139 if (ap
->ops
->set_piomode
)
2140 ap
->ops
->set_piomode(ap
, dev
);
2143 /* step 3: set host DMA timings */
2144 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2145 dev
= &ap
->device
[i
];
2147 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2150 dev
->xfer_mode
= dev
->dma_mode
;
2151 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2152 if (ap
->ops
->set_dmamode
)
2153 ap
->ops
->set_dmamode(ap
, dev
);
2156 /* step 4: update devices' xfer mode */
2157 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2158 dev
= &ap
->device
[i
];
2160 if (!ata_dev_enabled(dev
))
2163 rc
= ata_dev_set_mode(dev
);
2168 /* Record simplex status. If we selected DMA then the other
2169 * host channels are not permitted to do so.
2171 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2172 ap
->host_set
->simplex_claimed
= 1;
2174 /* step5: chip specific finalisation */
2175 if (ap
->ops
->post_set_mode
)
2176 ap
->ops
->post_set_mode(ap
);
2180 *r_failed_dev
= dev
;
2185 * ata_tf_to_host - issue ATA taskfile to host controller
2186 * @ap: port to which command is being issued
2187 * @tf: ATA taskfile register set
2189 * Issues ATA taskfile register set to ATA host controller,
2190 * with proper synchronization with interrupt handler and
2194 * spin_lock_irqsave(host_set lock)
2197 static inline void ata_tf_to_host(struct ata_port
*ap
,
2198 const struct ata_taskfile
*tf
)
2200 ap
->ops
->tf_load(ap
, tf
);
2201 ap
->ops
->exec_command(ap
, tf
);
2205 * ata_busy_sleep - sleep until BSY clears, or timeout
2206 * @ap: port containing status register to be polled
2207 * @tmout_pat: impatience timeout
2208 * @tmout: overall timeout
2210 * Sleep until ATA Status register bit BSY clears,
2211 * or a timeout occurs.
2216 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2217 unsigned long tmout_pat
, unsigned long tmout
)
2219 unsigned long timer_start
, timeout
;
2222 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2223 timer_start
= jiffies
;
2224 timeout
= timer_start
+ tmout_pat
;
2225 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2227 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2230 if (status
& ATA_BUSY
)
2231 ata_port_printk(ap
, KERN_WARNING
,
2232 "port is slow to respond, please be patient\n");
2234 timeout
= timer_start
+ tmout
;
2235 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2237 status
= ata_chk_status(ap
);
2240 if (status
& ATA_BUSY
) {
2241 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2242 "(%lu secs)\n", tmout
/ HZ
);
2249 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2251 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2252 unsigned int dev0
= devmask
& (1 << 0);
2253 unsigned int dev1
= devmask
& (1 << 1);
2254 unsigned long timeout
;
2256 /* if device 0 was found in ata_devchk, wait for its
2260 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2262 /* if device 1 was found in ata_devchk, wait for
2263 * register access, then wait for BSY to clear
2265 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2269 ap
->ops
->dev_select(ap
, 1);
2270 if (ap
->flags
& ATA_FLAG_MMIO
) {
2271 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2272 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2274 nsect
= inb(ioaddr
->nsect_addr
);
2275 lbal
= inb(ioaddr
->lbal_addr
);
2277 if ((nsect
== 1) && (lbal
== 1))
2279 if (time_after(jiffies
, timeout
)) {
2283 msleep(50); /* give drive a breather */
2286 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2288 /* is all this really necessary? */
2289 ap
->ops
->dev_select(ap
, 0);
2291 ap
->ops
->dev_select(ap
, 1);
2293 ap
->ops
->dev_select(ap
, 0);
2296 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2297 unsigned int devmask
)
2299 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2301 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2303 /* software reset. causes dev0 to be selected */
2304 if (ap
->flags
& ATA_FLAG_MMIO
) {
2305 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2306 udelay(20); /* FIXME: flush */
2307 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2308 udelay(20); /* FIXME: flush */
2309 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2311 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2313 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2315 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2318 /* spec mandates ">= 2ms" before checking status.
2319 * We wait 150ms, because that was the magic delay used for
2320 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2321 * between when the ATA command register is written, and then
2322 * status is checked. Because waiting for "a while" before
2323 * checking status is fine, post SRST, we perform this magic
2324 * delay here as well.
2326 * Old drivers/ide uses the 2mS rule and then waits for ready
2330 /* Before we perform post reset processing we want to see if
2331 * the bus shows 0xFF because the odd clown forgets the D7
2332 * pulldown resistor.
2334 if (ata_check_status(ap
) == 0xFF) {
2335 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2336 return AC_ERR_OTHER
;
2339 ata_bus_post_reset(ap
, devmask
);
2345 * ata_bus_reset - reset host port and associated ATA channel
2346 * @ap: port to reset
2348 * This is typically the first time we actually start issuing
2349 * commands to the ATA channel. We wait for BSY to clear, then
2350 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2351 * result. Determine what devices, if any, are on the channel
2352 * by looking at the device 0/1 error register. Look at the signature
2353 * stored in each device's taskfile registers, to determine if
2354 * the device is ATA or ATAPI.
2357 * PCI/etc. bus probe sem.
2358 * Obtains host_set lock.
2361 * Sets ATA_FLAG_DISABLED if bus reset fails.
2364 void ata_bus_reset(struct ata_port
*ap
)
2366 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2367 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2369 unsigned int dev0
, dev1
= 0, devmask
= 0;
2371 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2373 /* determine if device 0/1 are present */
2374 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2377 dev0
= ata_devchk(ap
, 0);
2379 dev1
= ata_devchk(ap
, 1);
2383 devmask
|= (1 << 0);
2385 devmask
|= (1 << 1);
2387 /* select device 0 again */
2388 ap
->ops
->dev_select(ap
, 0);
2390 /* issue bus reset */
2391 if (ap
->flags
& ATA_FLAG_SRST
)
2392 if (ata_bus_softreset(ap
, devmask
))
2396 * determine by signature whether we have ATA or ATAPI devices
2398 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2399 if ((slave_possible
) && (err
!= 0x81))
2400 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2402 /* re-enable interrupts */
2403 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2406 /* is double-select really necessary? */
2407 if (ap
->device
[1].class != ATA_DEV_NONE
)
2408 ap
->ops
->dev_select(ap
, 1);
2409 if (ap
->device
[0].class != ATA_DEV_NONE
)
2410 ap
->ops
->dev_select(ap
, 0);
2412 /* if no devices were detected, disable this port */
2413 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2414 (ap
->device
[1].class == ATA_DEV_NONE
))
2417 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2418 /* set up device control for ATA_FLAG_SATA_RESET */
2419 if (ap
->flags
& ATA_FLAG_MMIO
)
2420 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2422 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2429 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2430 ap
->ops
->port_disable(ap
);
2436 * sata_phy_debounce - debounce SATA phy status
2437 * @ap: ATA port to debounce SATA phy status for
2438 * @params: timing parameters { interval, duratinon, timeout } in msec
2440 * Make sure SStatus of @ap reaches stable state, determined by
2441 * holding the same value where DET is not 1 for @duration polled
2442 * every @interval, before @timeout. Timeout constraints the
2443 * beginning of the stable state. Because, after hot unplugging,
2444 * DET gets stuck at 1 on some controllers, this functions waits
2445 * until timeout then returns 0 if DET is stable at 1.
2448 * Kernel thread context (may sleep)
2451 * 0 on success, -errno on failure.
2453 int sata_phy_debounce(struct ata_port
*ap
, const unsigned long *params
)
2455 unsigned long interval_msec
= params
[0];
2456 unsigned long duration
= params
[1] * HZ
/ 1000;
2457 unsigned long timeout
= jiffies
+ params
[2] * HZ
/ 1000;
2458 unsigned long last_jiffies
;
2462 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2467 last_jiffies
= jiffies
;
2470 msleep(interval_msec
);
2471 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &cur
)))
2477 if (cur
== 1 && time_before(jiffies
, timeout
))
2479 if (time_after(jiffies
, last_jiffies
+ duration
))
2484 /* unstable, start over */
2486 last_jiffies
= jiffies
;
2489 if (time_after(jiffies
, timeout
))
2495 * sata_phy_resume - resume SATA phy
2496 * @ap: ATA port to resume SATA phy for
2497 * @params: timing parameters { interval, duratinon, timeout } in msec
2499 * Resume SATA phy of @ap and debounce it.
2502 * Kernel thread context (may sleep)
2505 * 0 on success, -errno on failure.
2507 int sata_phy_resume(struct ata_port
*ap
, const unsigned long *params
)
2512 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2515 scontrol
= (scontrol
& 0x0f0) | 0x300;
2517 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2520 /* Some PHYs react badly if SStatus is pounded immediately
2521 * after resuming. Delay 200ms before debouncing.
2525 return sata_phy_debounce(ap
, params
);
2528 static void ata_wait_spinup(struct ata_port
*ap
)
2530 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2531 unsigned long end
, secs
;
2534 /* first, debounce phy if SATA */
2535 if (ap
->cbl
== ATA_CBL_SATA
) {
2536 rc
= sata_phy_debounce(ap
, sata_deb_timing_eh
);
2538 /* if debounced successfully and offline, no need to wait */
2539 if ((rc
== 0 || rc
== -EOPNOTSUPP
) && ata_port_offline(ap
))
2543 /* okay, let's give the drive time to spin up */
2544 end
= ehc
->i
.hotplug_timestamp
+ ATA_SPINUP_WAIT
* HZ
/ 1000;
2545 secs
= ((end
- jiffies
) + HZ
- 1) / HZ
;
2547 if (time_after(jiffies
, end
))
2551 ata_port_printk(ap
, KERN_INFO
, "waiting for device to spin up "
2552 "(%lu secs)\n", secs
);
2554 schedule_timeout_uninterruptible(end
- jiffies
);
2558 * ata_std_prereset - prepare for reset
2559 * @ap: ATA port to be reset
2561 * @ap is about to be reset. Initialize it.
2564 * Kernel thread context (may sleep)
2567 * 0 on success, -errno otherwise.
2569 int ata_std_prereset(struct ata_port
*ap
)
2571 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2572 const unsigned long *timing
;
2576 if (ehc
->i
.flags
& ATA_EHI_HOTPLUGGED
) {
2577 if (ap
->flags
& ATA_FLAG_HRST_TO_RESUME
)
2578 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2579 if (ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
)
2580 ata_wait_spinup(ap
);
2583 /* if we're about to do hardreset, nothing more to do */
2584 if (ehc
->i
.action
& ATA_EH_HARDRESET
)
2587 /* if SATA, resume phy */
2588 if (ap
->cbl
== ATA_CBL_SATA
) {
2589 if (ap
->flags
& ATA_FLAG_LOADING
)
2590 timing
= sata_deb_timing_boot
;
2592 timing
= sata_deb_timing_eh
;
2594 rc
= sata_phy_resume(ap
, timing
);
2595 if (rc
&& rc
!= -EOPNOTSUPP
) {
2596 /* phy resume failed */
2597 ata_port_printk(ap
, KERN_WARNING
, "failed to resume "
2598 "link for reset (errno=%d)\n", rc
);
2603 /* Wait for !BSY if the controller can wait for the first D2H
2604 * Reg FIS and we don't know that no device is attached.
2606 if (!(ap
->flags
& ATA_FLAG_SKIP_D2H_BSY
) && !ata_port_offline(ap
))
2607 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2613 * ata_std_probeinit - initialize probing
2614 * @ap: port to be probed
2616 * @ap is about to be probed. Initialize it. This function is
2617 * to be used as standard callback for ata_drive_probe_reset().
2619 * NOTE!!! Do not use this function as probeinit if a low level
2620 * driver implements only hardreset. Just pass NULL as probeinit
2621 * in that case. Using this function is probably okay but doing
2622 * so makes reset sequence different from the original
2623 * ->phy_reset implementation and Jeff nervous. :-P
2625 void ata_std_probeinit(struct ata_port
*ap
)
2627 static const unsigned long deb_timing
[] = { 5, 100, 5000 };
2630 sata_phy_resume(ap
, deb_timing
);
2632 /* wait for device */
2633 if (ata_port_online(ap
))
2634 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2638 * ata_std_softreset - reset host port via ATA SRST
2639 * @ap: port to reset
2640 * @classes: resulting classes of attached devices
2642 * Reset host port using ATA SRST. This function is to be used
2643 * as standard callback for ata_drive_*_reset() functions.
2646 * Kernel thread context (may sleep)
2649 * 0 on success, -errno otherwise.
2651 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2653 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2654 unsigned int devmask
= 0, err_mask
;
2659 if (ata_port_offline(ap
)) {
2660 classes
[0] = ATA_DEV_NONE
;
2664 /* determine if device 0/1 are present */
2665 if (ata_devchk(ap
, 0))
2666 devmask
|= (1 << 0);
2667 if (slave_possible
&& ata_devchk(ap
, 1))
2668 devmask
|= (1 << 1);
2670 /* select device 0 again */
2671 ap
->ops
->dev_select(ap
, 0);
2673 /* issue bus reset */
2674 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2675 err_mask
= ata_bus_softreset(ap
, devmask
);
2677 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2682 /* determine by signature whether we have ATA or ATAPI devices */
2683 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2684 if (slave_possible
&& err
!= 0x81)
2685 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2688 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2693 * sata_std_hardreset - reset host port via SATA phy reset
2694 * @ap: port to reset
2695 * @class: resulting class of attached device
2697 * SATA phy-reset host port using DET bits of SControl register.
2698 * This function is to be used as standard callback for
2699 * ata_drive_*_reset().
2702 * Kernel thread context (may sleep)
2705 * 0 on success, -errno otherwise.
2707 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2714 if (sata_set_spd_needed(ap
)) {
2715 /* SATA spec says nothing about how to reconfigure
2716 * spd. To be on the safe side, turn off phy during
2717 * reconfiguration. This works for at least ICH7 AHCI
2720 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2723 scontrol
= (scontrol
& 0x0f0) | 0x302;
2725 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2731 /* issue phy wake/reset */
2732 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2735 scontrol
= (scontrol
& 0x0f0) | 0x301;
2737 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2740 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2741 * 10.4.2 says at least 1 ms.
2745 /* bring phy back */
2746 sata_phy_resume(ap
, sata_deb_timing_eh
);
2748 /* TODO: phy layer with polling, timeouts, etc. */
2749 if (ata_port_offline(ap
)) {
2750 *class = ATA_DEV_NONE
;
2751 DPRINTK("EXIT, link offline\n");
2755 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2756 ata_port_printk(ap
, KERN_ERR
,
2757 "COMRESET failed (device not ready)\n");
2761 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2763 *class = ata_dev_try_classify(ap
, 0, NULL
);
2765 DPRINTK("EXIT, class=%u\n", *class);
2770 * ata_std_postreset - standard postreset callback
2771 * @ap: the target ata_port
2772 * @classes: classes of attached devices
2774 * This function is invoked after a successful reset. Note that
2775 * the device might have been reset more than once using
2776 * different reset methods before postreset is invoked.
2778 * This function is to be used as standard callback for
2779 * ata_drive_*_reset().
2782 * Kernel thread context (may sleep)
2784 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2790 /* print link status */
2791 sata_print_link_status(ap
);
2794 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2795 sata_scr_write(ap
, SCR_ERROR
, serror
);
2797 /* re-enable interrupts */
2798 if (!ap
->ops
->error_handler
) {
2799 /* FIXME: hack. create a hook instead */
2800 if (ap
->ioaddr
.ctl_addr
)
2804 /* is double-select really necessary? */
2805 if (classes
[0] != ATA_DEV_NONE
)
2806 ap
->ops
->dev_select(ap
, 1);
2807 if (classes
[1] != ATA_DEV_NONE
)
2808 ap
->ops
->dev_select(ap
, 0);
2810 /* bail out if no device is present */
2811 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2812 DPRINTK("EXIT, no device\n");
2816 /* set up device control */
2817 if (ap
->ioaddr
.ctl_addr
) {
2818 if (ap
->flags
& ATA_FLAG_MMIO
)
2819 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2821 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2828 * ata_std_probe_reset - standard probe reset method
2829 * @ap: prot to perform probe-reset
2830 * @classes: resulting classes of attached devices
2832 * The stock off-the-shelf ->probe_reset method.
2835 * Kernel thread context (may sleep)
2838 * 0 on success, -errno otherwise.
2840 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2842 ata_reset_fn_t hardreset
;
2845 if (sata_scr_valid(ap
))
2846 hardreset
= sata_std_hardreset
;
2848 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2849 ata_std_softreset
, hardreset
,
2850 ata_std_postreset
, classes
);
2853 int ata_do_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2854 unsigned int *classes
)
2858 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2859 classes
[i
] = ATA_DEV_UNKNOWN
;
2861 rc
= reset(ap
, classes
);
2865 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2866 * is complete and convert all ATA_DEV_UNKNOWN to
2869 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2870 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2873 if (i
< ATA_MAX_DEVICES
)
2874 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2875 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2876 classes
[i
] = ATA_DEV_NONE
;
2882 * ata_drive_probe_reset - Perform probe reset with given methods
2883 * @ap: port to reset
2884 * @probeinit: probeinit method (can be NULL)
2885 * @softreset: softreset method (can be NULL)
2886 * @hardreset: hardreset method (can be NULL)
2887 * @postreset: postreset method (can be NULL)
2888 * @classes: resulting classes of attached devices
2890 * Reset the specified port and classify attached devices using
2891 * given methods. This function prefers softreset but tries all
2892 * possible reset sequences to reset and classify devices. This
2893 * function is intended to be used for constructing ->probe_reset
2894 * callback by low level drivers.
2896 * Reset methods should follow the following rules.
2898 * - Return 0 on sucess, -errno on failure.
2899 * - If classification is supported, fill classes[] with
2900 * recognized class codes.
2901 * - If classification is not supported, leave classes[] alone.
2904 * Kernel thread context (may sleep)
2907 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2908 * if classification fails, and any error code from reset
2911 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2912 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2913 ata_postreset_fn_t postreset
, unsigned int *classes
)
2917 ata_eh_freeze_port(ap
);
2922 if (softreset
&& !sata_set_spd_needed(ap
)) {
2923 rc
= ata_do_reset(ap
, softreset
, classes
);
2924 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2926 ata_port_printk(ap
, KERN_INFO
, "softreset failed, "
2927 "will try hardreset in 5 secs\n");
2935 rc
= ata_do_reset(ap
, hardreset
, classes
);
2937 if (classes
[0] != ATA_DEV_UNKNOWN
)
2942 if (sata_down_spd_limit(ap
))
2945 ata_port_printk(ap
, KERN_INFO
, "hardreset failed, "
2946 "will retry in 5 secs\n");
2951 ata_port_printk(ap
, KERN_INFO
,
2952 "hardreset succeeded without classification, "
2953 "will retry softreset in 5 secs\n");
2956 rc
= ata_do_reset(ap
, softreset
, classes
);
2962 postreset(ap
, classes
);
2964 ata_eh_thaw_port(ap
);
2966 if (classes
[0] == ATA_DEV_UNKNOWN
)
2973 * ata_dev_same_device - Determine whether new ID matches configured device
2974 * @dev: device to compare against
2975 * @new_class: class of the new device
2976 * @new_id: IDENTIFY page of the new device
2978 * Compare @new_class and @new_id against @dev and determine
2979 * whether @dev is the device indicated by @new_class and
2986 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2988 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2991 const u16
*old_id
= dev
->id
;
2992 unsigned char model
[2][41], serial
[2][21];
2995 if (dev
->class != new_class
) {
2996 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2997 dev
->class, new_class
);
3001 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
3002 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
3003 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
3004 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
3005 new_n_sectors
= ata_id_n_sectors(new_id
);
3007 if (strcmp(model
[0], model
[1])) {
3008 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
3009 "'%s' != '%s'\n", model
[0], model
[1]);
3013 if (strcmp(serial
[0], serial
[1])) {
3014 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
3015 "'%s' != '%s'\n", serial
[0], serial
[1]);
3019 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
3020 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
3022 (unsigned long long)dev
->n_sectors
,
3023 (unsigned long long)new_n_sectors
);
3031 * ata_dev_revalidate - Revalidate ATA device
3032 * @dev: device to revalidate
3033 * @post_reset: is this revalidation after reset?
3035 * Re-read IDENTIFY page and make sure @dev is still attached to
3039 * Kernel thread context (may sleep)
3042 * 0 on success, negative errno otherwise
3044 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
3046 unsigned int class = dev
->class;
3047 u16
*id
= (void *)dev
->ap
->sector_buf
;
3050 if (!ata_dev_enabled(dev
)) {
3056 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
3060 /* is the device still there? */
3061 if (!ata_dev_same_device(dev
, class, id
)) {
3066 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
3068 /* configure device according to the new ID */
3069 rc
= ata_dev_configure(dev
, 0);
3074 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
3078 static const char * const ata_dma_blacklist
[] = {
3079 "WDC AC11000H", NULL
,
3080 "WDC AC22100H", NULL
,
3081 "WDC AC32500H", NULL
,
3082 "WDC AC33100H", NULL
,
3083 "WDC AC31600H", NULL
,
3084 "WDC AC32100H", "24.09P07",
3085 "WDC AC23200L", "21.10N21",
3086 "Compaq CRD-8241B", NULL
,
3091 "SanDisk SDP3B", NULL
,
3092 "SanDisk SDP3B-64", NULL
,
3093 "SANYO CD-ROM CRD", NULL
,
3094 "HITACHI CDR-8", NULL
,
3095 "HITACHI CDR-8335", NULL
,
3096 "HITACHI CDR-8435", NULL
,
3097 "Toshiba CD-ROM XM-6202B", NULL
,
3098 "TOSHIBA CD-ROM XM-1702BC", NULL
,
3100 "E-IDE CD-ROM CR-840", NULL
,
3101 "CD-ROM Drive/F5A", NULL
,
3102 "WPI CDD-820", NULL
,
3103 "SAMSUNG CD-ROM SC-148C", NULL
,
3104 "SAMSUNG CD-ROM SC", NULL
,
3105 "SanDisk SDP3B-64", NULL
,
3106 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
3107 "_NEC DV5800A", NULL
,
3108 "SAMSUNG CD-ROM SN-124", "N001"
3111 static int ata_strim(char *s
, size_t len
)
3113 len
= strnlen(s
, len
);
3115 /* ATAPI specifies that empty space is blank-filled; remove blanks */
3116 while ((len
> 0) && (s
[len
- 1] == ' ')) {
3123 static int ata_dma_blacklisted(const struct ata_device
*dev
)
3125 unsigned char model_num
[40];
3126 unsigned char model_rev
[16];
3127 unsigned int nlen
, rlen
;
3130 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
3132 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
3134 nlen
= ata_strim(model_num
, sizeof(model_num
));
3135 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
3137 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
3138 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
3139 if (ata_dma_blacklist
[i
+1] == NULL
)
3141 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
3149 * ata_dev_xfermask - Compute supported xfermask of the given device
3150 * @dev: Device to compute xfermask for
3152 * Compute supported xfermask of @dev and store it in
3153 * dev->*_mask. This function is responsible for applying all
3154 * known limits including host controller limits, device
3157 * FIXME: The current implementation limits all transfer modes to
3158 * the fastest of the lowested device on the port. This is not
3159 * required on most controllers.
3164 static void ata_dev_xfermask(struct ata_device
*dev
)
3166 struct ata_port
*ap
= dev
->ap
;
3167 struct ata_host_set
*hs
= ap
->host_set
;
3168 unsigned long xfer_mask
;
3171 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
3172 ap
->mwdma_mask
, ap
->udma_mask
);
3174 /* Apply cable rule here. Don't apply it early because when
3175 * we handle hot plug the cable type can itself change.
3177 if (ap
->cbl
== ATA_CBL_PATA40
)
3178 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
3180 /* FIXME: Use port-wide xfermask for now */
3181 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
3182 struct ata_device
*d
= &ap
->device
[i
];
3184 if (ata_dev_absent(d
))
3187 if (ata_dev_disabled(d
)) {
3188 /* to avoid violating device selection timing */
3189 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3190 UINT_MAX
, UINT_MAX
);
3194 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
3195 d
->mwdma_mask
, d
->udma_mask
);
3196 xfer_mask
&= ata_id_xfermask(d
->id
);
3197 if (ata_dma_blacklisted(d
))
3198 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3201 if (ata_dma_blacklisted(dev
))
3202 ata_dev_printk(dev
, KERN_WARNING
,
3203 "device is on DMA blacklist, disabling DMA\n");
3205 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
3206 if (hs
->simplex_claimed
)
3207 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
3210 if (ap
->ops
->mode_filter
)
3211 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
3213 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
3214 &dev
->mwdma_mask
, &dev
->udma_mask
);
3218 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
3219 * @dev: Device to which command will be sent
3221 * Issue SET FEATURES - XFER MODE command to device @dev
3225 * PCI/etc. bus probe sem.
3228 * 0 on success, AC_ERR_* mask otherwise.
3231 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3233 struct ata_taskfile tf
;
3234 unsigned int err_mask
;
3236 /* set up set-features taskfile */
3237 DPRINTK("set features - xfer mode\n");
3239 ata_tf_init(dev
, &tf
);
3240 tf
.command
= ATA_CMD_SET_FEATURES
;
3241 tf
.feature
= SETFEATURES_XFER
;
3242 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3243 tf
.protocol
= ATA_PROT_NODATA
;
3244 tf
.nsect
= dev
->xfer_mode
;
3246 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3248 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3253 * ata_dev_init_params - Issue INIT DEV PARAMS command
3254 * @dev: Device to which command will be sent
3255 * @heads: Number of heads (taskfile parameter)
3256 * @sectors: Number of sectors (taskfile parameter)
3259 * Kernel thread context (may sleep)
3262 * 0 on success, AC_ERR_* mask otherwise.
3264 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3265 u16 heads
, u16 sectors
)
3267 struct ata_taskfile tf
;
3268 unsigned int err_mask
;
3270 /* Number of sectors per track 1-255. Number of heads 1-16 */
3271 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3272 return AC_ERR_INVALID
;
3274 /* set up init dev params taskfile */
3275 DPRINTK("init dev params \n");
3277 ata_tf_init(dev
, &tf
);
3278 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3279 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3280 tf
.protocol
= ATA_PROT_NODATA
;
3282 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3284 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3286 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3291 * ata_sg_clean - Unmap DMA memory associated with command
3292 * @qc: Command containing DMA memory to be released
3294 * Unmap all mapped DMA memory associated with this command.
3297 * spin_lock_irqsave(host_set lock)
3300 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3302 struct ata_port
*ap
= qc
->ap
;
3303 struct scatterlist
*sg
= qc
->__sg
;
3304 int dir
= qc
->dma_dir
;
3305 void *pad_buf
= NULL
;
3307 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3308 WARN_ON(sg
== NULL
);
3310 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3311 WARN_ON(qc
->n_elem
> 1);
3313 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3315 /* if we padded the buffer out to 32-bit bound, and data
3316 * xfer direction is from-device, we must copy from the
3317 * pad buffer back into the supplied buffer
3319 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3320 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3322 if (qc
->flags
& ATA_QCFLAG_SG
) {
3324 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3325 /* restore last sg */
3326 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3328 struct scatterlist
*psg
= &qc
->pad_sgent
;
3329 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3330 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3331 kunmap_atomic(addr
, KM_IRQ0
);
3335 dma_unmap_single(ap
->dev
,
3336 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3339 sg
->length
+= qc
->pad_len
;
3341 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3342 pad_buf
, qc
->pad_len
);
3345 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3350 * ata_fill_sg - Fill PCI IDE PRD table
3351 * @qc: Metadata associated with taskfile to be transferred
3353 * Fill PCI IDE PRD (scatter-gather) table with segments
3354 * associated with the current disk command.
3357 * spin_lock_irqsave(host_set lock)
3360 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3362 struct ata_port
*ap
= qc
->ap
;
3363 struct scatterlist
*sg
;
3366 WARN_ON(qc
->__sg
== NULL
);
3367 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3370 ata_for_each_sg(sg
, qc
) {
3374 /* determine if physical DMA addr spans 64K boundary.
3375 * Note h/w doesn't support 64-bit, so we unconditionally
3376 * truncate dma_addr_t to u32.
3378 addr
= (u32
) sg_dma_address(sg
);
3379 sg_len
= sg_dma_len(sg
);
3382 offset
= addr
& 0xffff;
3384 if ((offset
+ sg_len
) > 0x10000)
3385 len
= 0x10000 - offset
;
3387 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3388 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3389 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3398 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3401 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3402 * @qc: Metadata associated with taskfile to check
3404 * Allow low-level driver to filter ATA PACKET commands, returning
3405 * a status indicating whether or not it is OK to use DMA for the
3406 * supplied PACKET command.
3409 * spin_lock_irqsave(host_set lock)
3411 * RETURNS: 0 when ATAPI DMA can be used
3414 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3416 struct ata_port
*ap
= qc
->ap
;
3417 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3419 if (ap
->ops
->check_atapi_dma
)
3420 rc
= ap
->ops
->check_atapi_dma(qc
);
3422 /* We don't support polling DMA.
3423 * Use PIO if the LLDD handles only interrupts in
3424 * the HSM_ST_LAST state and the ATAPI device
3425 * generates CDB interrupts.
3427 if ((ap
->flags
& ATA_FLAG_PIO_POLLING
) &&
3428 (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3434 * ata_qc_prep - Prepare taskfile for submission
3435 * @qc: Metadata associated with taskfile to be prepared
3437 * Prepare ATA taskfile for submission.
3440 * spin_lock_irqsave(host_set lock)
3442 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3444 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3450 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3453 * ata_sg_init_one - Associate command with memory buffer
3454 * @qc: Command to be associated
3455 * @buf: Memory buffer
3456 * @buflen: Length of memory buffer, in bytes.
3458 * Initialize the data-related elements of queued_cmd @qc
3459 * to point to a single memory buffer, @buf of byte length @buflen.
3462 * spin_lock_irqsave(host_set lock)
3465 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3467 struct scatterlist
*sg
;
3469 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3471 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3472 qc
->__sg
= &qc
->sgent
;
3474 qc
->orig_n_elem
= 1;
3478 sg_init_one(sg
, buf
, buflen
);
3482 * ata_sg_init - Associate command with scatter-gather table.
3483 * @qc: Command to be associated
3484 * @sg: Scatter-gather table.
3485 * @n_elem: Number of elements in s/g table.
3487 * Initialize the data-related elements of queued_cmd @qc
3488 * to point to a scatter-gather table @sg, containing @n_elem
3492 * spin_lock_irqsave(host_set lock)
3495 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3496 unsigned int n_elem
)
3498 qc
->flags
|= ATA_QCFLAG_SG
;
3500 qc
->n_elem
= n_elem
;
3501 qc
->orig_n_elem
= n_elem
;
3505 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3506 * @qc: Command with memory buffer to be mapped.
3508 * DMA-map the memory buffer associated with queued_cmd @qc.
3511 * spin_lock_irqsave(host_set lock)
3514 * Zero on success, negative on error.
3517 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3519 struct ata_port
*ap
= qc
->ap
;
3520 int dir
= qc
->dma_dir
;
3521 struct scatterlist
*sg
= qc
->__sg
;
3522 dma_addr_t dma_address
;
3525 /* we must lengthen transfers to end on a 32-bit boundary */
3526 qc
->pad_len
= sg
->length
& 3;
3528 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3529 struct scatterlist
*psg
= &qc
->pad_sgent
;
3531 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3533 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3535 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3536 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3539 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3540 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3542 sg
->length
-= qc
->pad_len
;
3543 if (sg
->length
== 0)
3546 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3547 sg
->length
, qc
->pad_len
);
3555 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3557 if (dma_mapping_error(dma_address
)) {
3559 sg
->length
+= qc
->pad_len
;
3563 sg_dma_address(sg
) = dma_address
;
3564 sg_dma_len(sg
) = sg
->length
;
3567 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3568 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3574 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3575 * @qc: Command with scatter-gather table to be mapped.
3577 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3580 * spin_lock_irqsave(host_set lock)
3583 * Zero on success, negative on error.
3587 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3589 struct ata_port
*ap
= qc
->ap
;
3590 struct scatterlist
*sg
= qc
->__sg
;
3591 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3592 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3594 VPRINTK("ENTER, ata%u\n", ap
->id
);
3595 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3597 /* we must lengthen transfers to end on a 32-bit boundary */
3598 qc
->pad_len
= lsg
->length
& 3;
3600 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3601 struct scatterlist
*psg
= &qc
->pad_sgent
;
3602 unsigned int offset
;
3604 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3606 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3609 * psg->page/offset are used to copy to-be-written
3610 * data in this function or read data in ata_sg_clean.
3612 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3613 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3614 psg
->offset
= offset_in_page(offset
);
3616 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3617 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3618 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3619 kunmap_atomic(addr
, KM_IRQ0
);
3622 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3623 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3625 lsg
->length
-= qc
->pad_len
;
3626 if (lsg
->length
== 0)
3629 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3630 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3633 pre_n_elem
= qc
->n_elem
;
3634 if (trim_sg
&& pre_n_elem
)
3643 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3645 /* restore last sg */
3646 lsg
->length
+= qc
->pad_len
;
3650 DPRINTK("%d sg elements mapped\n", n_elem
);
3653 qc
->n_elem
= n_elem
;
3659 * swap_buf_le16 - swap halves of 16-bit words in place
3660 * @buf: Buffer to swap
3661 * @buf_words: Number of 16-bit words in buffer.
3663 * Swap halves of 16-bit words if needed to convert from
3664 * little-endian byte order to native cpu byte order, or
3668 * Inherited from caller.
3670 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3675 for (i
= 0; i
< buf_words
; i
++)
3676 buf
[i
] = le16_to_cpu(buf
[i
]);
3677 #endif /* __BIG_ENDIAN */
3681 * ata_mmio_data_xfer - Transfer data by MMIO
3682 * @dev: device for this I/O
3684 * @buflen: buffer length
3685 * @write_data: read/write
3687 * Transfer data from/to the device data register by MMIO.
3690 * Inherited from caller.
3693 void ata_mmio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3694 unsigned int buflen
, int write_data
)
3696 struct ata_port
*ap
= adev
->ap
;
3698 unsigned int words
= buflen
>> 1;
3699 u16
*buf16
= (u16
*) buf
;
3700 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3702 /* Transfer multiple of 2 bytes */
3704 for (i
= 0; i
< words
; i
++)
3705 writew(le16_to_cpu(buf16
[i
]), mmio
);
3707 for (i
= 0; i
< words
; i
++)
3708 buf16
[i
] = cpu_to_le16(readw(mmio
));
3711 /* Transfer trailing 1 byte, if any. */
3712 if (unlikely(buflen
& 0x01)) {
3713 u16 align_buf
[1] = { 0 };
3714 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3717 memcpy(align_buf
, trailing_buf
, 1);
3718 writew(le16_to_cpu(align_buf
[0]), mmio
);
3720 align_buf
[0] = cpu_to_le16(readw(mmio
));
3721 memcpy(trailing_buf
, align_buf
, 1);
3727 * ata_pio_data_xfer - Transfer data by PIO
3728 * @adev: device to target
3730 * @buflen: buffer length
3731 * @write_data: read/write
3733 * Transfer data from/to the device data register by PIO.
3736 * Inherited from caller.
3739 void ata_pio_data_xfer(struct ata_device
*adev
, unsigned char *buf
,
3740 unsigned int buflen
, int write_data
)
3742 struct ata_port
*ap
= adev
->ap
;
3743 unsigned int words
= buflen
>> 1;
3745 /* Transfer multiple of 2 bytes */
3747 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3749 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3751 /* Transfer trailing 1 byte, if any. */
3752 if (unlikely(buflen
& 0x01)) {
3753 u16 align_buf
[1] = { 0 };
3754 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3757 memcpy(align_buf
, trailing_buf
, 1);
3758 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3760 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3761 memcpy(trailing_buf
, align_buf
, 1);
3767 * ata_pio_data_xfer_noirq - Transfer data by PIO
3768 * @adev: device to target
3770 * @buflen: buffer length
3771 * @write_data: read/write
3773 * Transfer data from/to the device data register by PIO. Do the
3774 * transfer with interrupts disabled.
3777 * Inherited from caller.
3780 void ata_pio_data_xfer_noirq(struct ata_device
*adev
, unsigned char *buf
,
3781 unsigned int buflen
, int write_data
)
3783 unsigned long flags
;
3784 local_irq_save(flags
);
3785 ata_pio_data_xfer(adev
, buf
, buflen
, write_data
);
3786 local_irq_restore(flags
);
3791 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3792 * @qc: Command on going
3794 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3797 * Inherited from caller.
3800 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3802 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3803 struct scatterlist
*sg
= qc
->__sg
;
3804 struct ata_port
*ap
= qc
->ap
;
3806 unsigned int offset
;
3809 if (qc
->cursect
== (qc
->nsect
- 1))
3810 ap
->hsm_task_state
= HSM_ST_LAST
;
3812 page
= sg
[qc
->cursg
].page
;
3813 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3815 /* get the current page and offset */
3816 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3817 offset
%= PAGE_SIZE
;
3819 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3821 if (PageHighMem(page
)) {
3822 unsigned long flags
;
3824 /* FIXME: use a bounce buffer */
3825 local_irq_save(flags
);
3826 buf
= kmap_atomic(page
, KM_IRQ0
);
3828 /* do the actual data transfer */
3829 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3831 kunmap_atomic(buf
, KM_IRQ0
);
3832 local_irq_restore(flags
);
3834 buf
= page_address(page
);
3835 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3841 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3848 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3849 * @qc: Command on going
3851 * Transfer one or many ATA_SECT_SIZE of data from/to the
3852 * ATA device for the DRQ request.
3855 * Inherited from caller.
3858 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3860 if (is_multi_taskfile(&qc
->tf
)) {
3861 /* READ/WRITE MULTIPLE */
3864 WARN_ON(qc
->dev
->multi_count
== 0);
3866 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3874 * atapi_send_cdb - Write CDB bytes to hardware
3875 * @ap: Port to which ATAPI device is attached.
3876 * @qc: Taskfile currently active
3878 * When device has indicated its readiness to accept
3879 * a CDB, this function is called. Send the CDB.
3885 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3888 DPRINTK("send cdb\n");
3889 WARN_ON(qc
->dev
->cdb_len
< 12);
3891 ap
->ops
->data_xfer(qc
->dev
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3892 ata_altstatus(ap
); /* flush */
3894 switch (qc
->tf
.protocol
) {
3895 case ATA_PROT_ATAPI
:
3896 ap
->hsm_task_state
= HSM_ST
;
3898 case ATA_PROT_ATAPI_NODATA
:
3899 ap
->hsm_task_state
= HSM_ST_LAST
;
3901 case ATA_PROT_ATAPI_DMA
:
3902 ap
->hsm_task_state
= HSM_ST_LAST
;
3903 /* initiate bmdma */
3904 ap
->ops
->bmdma_start(qc
);
3910 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3911 * @qc: Command on going
3912 * @bytes: number of bytes
3914 * Transfer Transfer data from/to the ATAPI device.
3917 * Inherited from caller.
3921 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3923 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3924 struct scatterlist
*sg
= qc
->__sg
;
3925 struct ata_port
*ap
= qc
->ap
;
3928 unsigned int offset
, count
;
3930 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3931 ap
->hsm_task_state
= HSM_ST_LAST
;
3934 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3936 * The end of qc->sg is reached and the device expects
3937 * more data to transfer. In order not to overrun qc->sg
3938 * and fulfill length specified in the byte count register,
3939 * - for read case, discard trailing data from the device
3940 * - for write case, padding zero data to the device
3942 u16 pad_buf
[1] = { 0 };
3943 unsigned int words
= bytes
>> 1;
3946 if (words
) /* warning if bytes > 1 */
3947 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3948 "%u bytes trailing data\n", bytes
);
3950 for (i
= 0; i
< words
; i
++)
3951 ap
->ops
->data_xfer(qc
->dev
, (unsigned char*)pad_buf
, 2, do_write
);
3953 ap
->hsm_task_state
= HSM_ST_LAST
;
3957 sg
= &qc
->__sg
[qc
->cursg
];
3960 offset
= sg
->offset
+ qc
->cursg_ofs
;
3962 /* get the current page and offset */
3963 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3964 offset
%= PAGE_SIZE
;
3966 /* don't overrun current sg */
3967 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3969 /* don't cross page boundaries */
3970 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3972 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3974 if (PageHighMem(page
)) {
3975 unsigned long flags
;
3977 /* FIXME: use bounce buffer */
3978 local_irq_save(flags
);
3979 buf
= kmap_atomic(page
, KM_IRQ0
);
3981 /* do the actual data transfer */
3982 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3984 kunmap_atomic(buf
, KM_IRQ0
);
3985 local_irq_restore(flags
);
3987 buf
= page_address(page
);
3988 ap
->ops
->data_xfer(qc
->dev
, buf
+ offset
, count
, do_write
);
3992 qc
->curbytes
+= count
;
3993 qc
->cursg_ofs
+= count
;
3995 if (qc
->cursg_ofs
== sg
->length
) {
4005 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
4006 * @qc: Command on going
4008 * Transfer Transfer data from/to the ATAPI device.
4011 * Inherited from caller.
4014 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
4016 struct ata_port
*ap
= qc
->ap
;
4017 struct ata_device
*dev
= qc
->dev
;
4018 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
4019 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
4021 /* Abuse qc->result_tf for temp storage of intermediate TF
4022 * here to save some kernel stack usage.
4023 * For normal completion, qc->result_tf is not relevant. For
4024 * error, qc->result_tf is later overwritten by ata_qc_complete().
4025 * So, the correctness of qc->result_tf is not affected.
4027 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4028 ireason
= qc
->result_tf
.nsect
;
4029 bc_lo
= qc
->result_tf
.lbam
;
4030 bc_hi
= qc
->result_tf
.lbah
;
4031 bytes
= (bc_hi
<< 8) | bc_lo
;
4033 /* shall be cleared to zero, indicating xfer of data */
4034 if (ireason
& (1 << 0))
4037 /* make sure transfer direction matches expected */
4038 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
4039 if (do_write
!= i_write
)
4042 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
4044 __atapi_pio_bytes(qc
, bytes
);
4049 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
4050 qc
->err_mask
|= AC_ERR_HSM
;
4051 ap
->hsm_task_state
= HSM_ST_ERR
;
4055 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
4056 * @ap: the target ata_port
4060 * 1 if ok in workqueue, 0 otherwise.
4063 static inline int ata_hsm_ok_in_wq(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
4065 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4068 if (ap
->hsm_task_state
== HSM_ST_FIRST
) {
4069 if (qc
->tf
.protocol
== ATA_PROT_PIO
&&
4070 (qc
->tf
.flags
& ATA_TFLAG_WRITE
))
4073 if (is_atapi_taskfile(&qc
->tf
) &&
4074 !(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4082 * ata_hsm_qc_complete - finish a qc running on standard HSM
4083 * @qc: Command to complete
4084 * @in_wq: 1 if called from workqueue, 0 otherwise
4086 * Finish @qc which is running on standard HSM.
4089 * If @in_wq is zero, spin_lock_irqsave(host_set lock).
4090 * Otherwise, none on entry and grabs host lock.
4092 static void ata_hsm_qc_complete(struct ata_queued_cmd
*qc
, int in_wq
)
4094 struct ata_port
*ap
= qc
->ap
;
4095 unsigned long flags
;
4097 if (ap
->ops
->error_handler
) {
4099 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4101 /* EH might have kicked in while host_set lock
4104 qc
= ata_qc_from_tag(ap
, qc
->tag
);
4106 if (likely(!(qc
->err_mask
& AC_ERR_HSM
))) {
4108 ata_qc_complete(qc
);
4110 ata_port_freeze(ap
);
4113 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4115 if (likely(!(qc
->err_mask
& AC_ERR_HSM
)))
4116 ata_qc_complete(qc
);
4118 ata_port_freeze(ap
);
4122 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4124 ata_qc_complete(qc
);
4125 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4127 ata_qc_complete(qc
);
4130 ata_altstatus(ap
); /* flush */
4134 * ata_hsm_move - move the HSM to the next state.
4135 * @ap: the target ata_port
4137 * @status: current device status
4138 * @in_wq: 1 if called from workqueue, 0 otherwise
4141 * 1 when poll next status needed, 0 otherwise.
4143 int ata_hsm_move(struct ata_port
*ap
, struct ata_queued_cmd
*qc
,
4144 u8 status
, int in_wq
)
4146 unsigned long flags
= 0;
4149 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
4151 /* Make sure ata_qc_issue_prot() does not throw things
4152 * like DMA polling into the workqueue. Notice that
4153 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
4155 WARN_ON(in_wq
!= ata_hsm_ok_in_wq(ap
, qc
));
4158 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4159 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
4161 switch (ap
->hsm_task_state
) {
4163 /* Send first data block or PACKET CDB */
4165 /* If polling, we will stay in the work queue after
4166 * sending the data. Otherwise, interrupt handler
4167 * takes over after sending the data.
4169 poll_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4171 /* check device status */
4172 if (unlikely((status
& ATA_DRQ
) == 0)) {
4173 /* handle BSY=0, DRQ=0 as error */
4174 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4175 /* device stops HSM for abort/error */
4176 qc
->err_mask
|= AC_ERR_DEV
;
4178 /* HSM violation. Let EH handle this */
4179 qc
->err_mask
|= AC_ERR_HSM
;
4181 ap
->hsm_task_state
= HSM_ST_ERR
;
4185 /* Device should not ask for data transfer (DRQ=1)
4186 * when it finds something wrong.
4187 * We ignore DRQ here and stop the HSM by
4188 * changing hsm_task_state to HSM_ST_ERR and
4189 * let the EH abort the command or reset the device.
4191 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4192 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4194 qc
->err_mask
|= AC_ERR_HSM
;
4195 ap
->hsm_task_state
= HSM_ST_ERR
;
4199 /* Send the CDB (atapi) or the first data block (ata pio out).
4200 * During the state transition, interrupt handler shouldn't
4201 * be invoked before the data transfer is complete and
4202 * hsm_task_state is changed. Hence, the following locking.
4205 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4207 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
4208 /* PIO data out protocol.
4209 * send first data block.
4212 /* ata_pio_sectors() might change the state
4213 * to HSM_ST_LAST. so, the state is changed here
4214 * before ata_pio_sectors().
4216 ap
->hsm_task_state
= HSM_ST
;
4217 ata_pio_sectors(qc
);
4218 ata_altstatus(ap
); /* flush */
4221 atapi_send_cdb(ap
, qc
);
4224 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4226 /* if polling, ata_pio_task() handles the rest.
4227 * otherwise, interrupt handler takes over from here.
4232 /* complete command or read/write the data register */
4233 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4234 /* ATAPI PIO protocol */
4235 if ((status
& ATA_DRQ
) == 0) {
4236 /* No more data to transfer or device error.
4237 * Device error will be tagged in HSM_ST_LAST.
4239 ap
->hsm_task_state
= HSM_ST_LAST
;
4243 /* Device should not ask for data transfer (DRQ=1)
4244 * when it finds something wrong.
4245 * We ignore DRQ here and stop the HSM by
4246 * changing hsm_task_state to HSM_ST_ERR and
4247 * let the EH abort the command or reset the device.
4249 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4250 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
4252 qc
->err_mask
|= AC_ERR_HSM
;
4253 ap
->hsm_task_state
= HSM_ST_ERR
;
4257 atapi_pio_bytes(qc
);
4259 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4260 /* bad ireason reported by device */
4264 /* ATA PIO protocol */
4265 if (unlikely((status
& ATA_DRQ
) == 0)) {
4266 /* handle BSY=0, DRQ=0 as error */
4267 if (likely(status
& (ATA_ERR
| ATA_DF
)))
4268 /* device stops HSM for abort/error */
4269 qc
->err_mask
|= AC_ERR_DEV
;
4271 /* HSM violation. Let EH handle this */
4272 qc
->err_mask
|= AC_ERR_HSM
;
4274 ap
->hsm_task_state
= HSM_ST_ERR
;
4278 /* For PIO reads, some devices may ask for
4279 * data transfer (DRQ=1) alone with ERR=1.
4280 * We respect DRQ here and transfer one
4281 * block of junk data before changing the
4282 * hsm_task_state to HSM_ST_ERR.
4284 * For PIO writes, ERR=1 DRQ=1 doesn't make
4285 * sense since the data block has been
4286 * transferred to the device.
4288 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4289 /* data might be corrputed */
4290 qc
->err_mask
|= AC_ERR_DEV
;
4292 if (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
)) {
4293 ata_pio_sectors(qc
);
4295 status
= ata_wait_idle(ap
);
4298 if (status
& (ATA_BUSY
| ATA_DRQ
))
4299 qc
->err_mask
|= AC_ERR_HSM
;
4301 /* ata_pio_sectors() might change the
4302 * state to HSM_ST_LAST. so, the state
4303 * is changed after ata_pio_sectors().
4305 ap
->hsm_task_state
= HSM_ST_ERR
;
4309 ata_pio_sectors(qc
);
4311 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4312 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4315 status
= ata_wait_idle(ap
);
4320 ata_altstatus(ap
); /* flush */
4325 if (unlikely(!ata_ok(status
))) {
4326 qc
->err_mask
|= __ac_err_mask(status
);
4327 ap
->hsm_task_state
= HSM_ST_ERR
;
4331 /* no more data to transfer */
4332 DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
4333 ap
->id
, qc
->dev
->devno
, status
);
4335 WARN_ON(qc
->err_mask
);
4337 ap
->hsm_task_state
= HSM_ST_IDLE
;
4339 /* complete taskfile transaction */
4340 ata_hsm_qc_complete(qc
, in_wq
);
4346 /* make sure qc->err_mask is available to
4347 * know what's wrong and recover
4349 WARN_ON(qc
->err_mask
== 0);
4351 ap
->hsm_task_state
= HSM_ST_IDLE
;
4353 /* complete taskfile transaction */
4354 ata_hsm_qc_complete(qc
, in_wq
);
4366 static void ata_pio_task(void *_data
)
4368 struct ata_queued_cmd
*qc
= _data
;
4369 struct ata_port
*ap
= qc
->ap
;
4374 WARN_ON(ap
->hsm_task_state
== HSM_ST_IDLE
);
4377 * This is purely heuristic. This is a fast path.
4378 * Sometimes when we enter, BSY will be cleared in
4379 * a chk-status or two. If not, the drive is probably seeking
4380 * or something. Snooze for a couple msecs, then
4381 * chk-status again. If still busy, queue delayed work.
4383 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
4384 if (status
& ATA_BUSY
) {
4386 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
4387 if (status
& ATA_BUSY
) {
4388 ata_port_queue_task(ap
, ata_pio_task
, qc
, ATA_SHORT_PAUSE
);
4394 poll_next
= ata_hsm_move(ap
, qc
, status
, 1);
4396 /* another command or interrupt handler
4397 * may be running at this point.
4404 * ata_qc_new - Request an available ATA command, for queueing
4405 * @ap: Port associated with device @dev
4406 * @dev: Device from whom we request an available command structure
4412 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4414 struct ata_queued_cmd
*qc
= NULL
;
4417 /* no command while frozen */
4418 if (unlikely(ap
->flags
& ATA_FLAG_FROZEN
))
4421 /* the last tag is reserved for internal command. */
4422 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4423 if (!test_and_set_bit(i
, &ap
->qc_allocated
)) {
4424 qc
= __ata_qc_from_tag(ap
, i
);
4435 * ata_qc_new_init - Request an available ATA command, and initialize it
4436 * @dev: Device from whom we request an available command structure
4442 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4444 struct ata_port
*ap
= dev
->ap
;
4445 struct ata_queued_cmd
*qc
;
4447 qc
= ata_qc_new(ap
);
4460 * ata_qc_free - free unused ata_queued_cmd
4461 * @qc: Command to complete
4463 * Designed to free unused ata_queued_cmd object
4464 * in case something prevents using it.
4467 * spin_lock_irqsave(host_set lock)
4469 void ata_qc_free(struct ata_queued_cmd
*qc
)
4471 struct ata_port
*ap
= qc
->ap
;
4474 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4478 if (likely(ata_tag_valid(tag
))) {
4479 qc
->tag
= ATA_TAG_POISON
;
4480 clear_bit(tag
, &ap
->qc_allocated
);
4484 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4486 struct ata_port
*ap
= qc
->ap
;
4488 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4489 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4491 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4494 /* command should be marked inactive atomically with qc completion */
4495 if (qc
->tf
.protocol
== ATA_PROT_NCQ
)
4496 ap
->sactive
&= ~(1 << qc
->tag
);
4498 ap
->active_tag
= ATA_TAG_POISON
;
4500 /* atapi: mark qc as inactive to prevent the interrupt handler
4501 * from completing the command twice later, before the error handler
4502 * is called. (when rc != 0 and atapi request sense is needed)
4504 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4505 ap
->qc_active
&= ~(1 << qc
->tag
);
4507 /* call completion callback */
4508 qc
->complete_fn(qc
);
4512 * ata_qc_complete - Complete an active ATA command
4513 * @qc: Command to complete
4514 * @err_mask: ATA Status register contents
4516 * Indicate to the mid and upper layers that an ATA
4517 * command has completed, with either an ok or not-ok status.
4520 * spin_lock_irqsave(host_set lock)
4522 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4524 struct ata_port
*ap
= qc
->ap
;
4526 /* XXX: New EH and old EH use different mechanisms to
4527 * synchronize EH with regular execution path.
4529 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4530 * Normal execution path is responsible for not accessing a
4531 * failed qc. libata core enforces the rule by returning NULL
4532 * from ata_qc_from_tag() for failed qcs.
4534 * Old EH depends on ata_qc_complete() nullifying completion
4535 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4536 * not synchronize with interrupt handler. Only PIO task is
4539 if (ap
->ops
->error_handler
) {
4540 WARN_ON(ap
->flags
& ATA_FLAG_FROZEN
);
4542 if (unlikely(qc
->err_mask
))
4543 qc
->flags
|= ATA_QCFLAG_FAILED
;
4545 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4546 if (!ata_tag_internal(qc
->tag
)) {
4547 /* always fill result TF for failed qc */
4548 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4549 ata_qc_schedule_eh(qc
);
4554 /* read result TF if requested */
4555 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4556 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4558 __ata_qc_complete(qc
);
4560 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4563 /* read result TF if failed or requested */
4564 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4565 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4567 __ata_qc_complete(qc
);
4572 * ata_qc_complete_multiple - Complete multiple qcs successfully
4573 * @ap: port in question
4574 * @qc_active: new qc_active mask
4575 * @finish_qc: LLDD callback invoked before completing a qc
4577 * Complete in-flight commands. This functions is meant to be
4578 * called from low-level driver's interrupt routine to complete
4579 * requests normally. ap->qc_active and @qc_active is compared
4580 * and commands are completed accordingly.
4583 * spin_lock_irqsave(host_set lock)
4586 * Number of completed commands on success, -errno otherwise.
4588 int ata_qc_complete_multiple(struct ata_port
*ap
, u32 qc_active
,
4589 void (*finish_qc
)(struct ata_queued_cmd
*))
4595 done_mask
= ap
->qc_active
^ qc_active
;
4597 if (unlikely(done_mask
& qc_active
)) {
4598 ata_port_printk(ap
, KERN_ERR
, "illegal qc_active transition "
4599 "(%08x->%08x)\n", ap
->qc_active
, qc_active
);
4603 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
4604 struct ata_queued_cmd
*qc
;
4606 if (!(done_mask
& (1 << i
)))
4609 if ((qc
= ata_qc_from_tag(ap
, i
))) {
4612 ata_qc_complete(qc
);
4620 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4622 struct ata_port
*ap
= qc
->ap
;
4624 switch (qc
->tf
.protocol
) {
4627 case ATA_PROT_ATAPI_DMA
:
4630 case ATA_PROT_ATAPI
:
4632 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4645 * ata_qc_issue - issue taskfile to device
4646 * @qc: command to issue to device
4648 * Prepare an ATA command to submission to device.
4649 * This includes mapping the data into a DMA-able
4650 * area, filling in the S/G table, and finally
4651 * writing the taskfile to hardware, starting the command.
4654 * spin_lock_irqsave(host_set lock)
4656 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4658 struct ata_port
*ap
= qc
->ap
;
4660 /* Make sure only one non-NCQ command is outstanding. The
4661 * check is skipped for old EH because it reuses active qc to
4662 * request ATAPI sense.
4664 WARN_ON(ap
->ops
->error_handler
&& ata_tag_valid(ap
->active_tag
));
4666 if (qc
->tf
.protocol
== ATA_PROT_NCQ
) {
4667 WARN_ON(ap
->sactive
& (1 << qc
->tag
));
4668 ap
->sactive
|= 1 << qc
->tag
;
4670 WARN_ON(ap
->sactive
);
4671 ap
->active_tag
= qc
->tag
;
4674 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4675 ap
->qc_active
|= 1 << qc
->tag
;
4677 if (ata_should_dma_map(qc
)) {
4678 if (qc
->flags
& ATA_QCFLAG_SG
) {
4679 if (ata_sg_setup(qc
))
4681 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4682 if (ata_sg_setup_one(qc
))
4686 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4689 ap
->ops
->qc_prep(qc
);
4691 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4692 if (unlikely(qc
->err_mask
))
4697 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4698 qc
->err_mask
|= AC_ERR_SYSTEM
;
4700 ata_qc_complete(qc
);
4704 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4705 * @qc: command to issue to device
4707 * Using various libata functions and hooks, this function
4708 * starts an ATA command. ATA commands are grouped into
4709 * classes called "protocols", and issuing each type of protocol
4710 * is slightly different.
4712 * May be used as the qc_issue() entry in ata_port_operations.
4715 * spin_lock_irqsave(host_set lock)
4718 * Zero on success, AC_ERR_* mask on failure
4721 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4723 struct ata_port
*ap
= qc
->ap
;
4725 /* Use polling pio if the LLD doesn't handle
4726 * interrupt driven pio and atapi CDB interrupt.
4728 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4729 switch (qc
->tf
.protocol
) {
4731 case ATA_PROT_ATAPI
:
4732 case ATA_PROT_ATAPI_NODATA
:
4733 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4735 case ATA_PROT_ATAPI_DMA
:
4736 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4737 /* see ata_check_atapi_dma() */
4745 /* select the device */
4746 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4748 /* start the command */
4749 switch (qc
->tf
.protocol
) {
4750 case ATA_PROT_NODATA
:
4751 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4752 ata_qc_set_polling(qc
);
4754 ata_tf_to_host(ap
, &qc
->tf
);
4755 ap
->hsm_task_state
= HSM_ST_LAST
;
4757 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4758 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4763 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4765 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4766 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4767 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4768 ap
->hsm_task_state
= HSM_ST_LAST
;
4772 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4773 ata_qc_set_polling(qc
);
4775 ata_tf_to_host(ap
, &qc
->tf
);
4777 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4778 /* PIO data out protocol */
4779 ap
->hsm_task_state
= HSM_ST_FIRST
;
4780 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4782 /* always send first data block using
4783 * the ata_pio_task() codepath.
4786 /* PIO data in protocol */
4787 ap
->hsm_task_state
= HSM_ST
;
4789 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4790 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4792 /* if polling, ata_pio_task() handles the rest.
4793 * otherwise, interrupt handler takes over from here.
4799 case ATA_PROT_ATAPI
:
4800 case ATA_PROT_ATAPI_NODATA
:
4801 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4802 ata_qc_set_polling(qc
);
4804 ata_tf_to_host(ap
, &qc
->tf
);
4806 ap
->hsm_task_state
= HSM_ST_FIRST
;
4808 /* send cdb by polling if no cdb interrupt */
4809 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4810 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4811 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4814 case ATA_PROT_ATAPI_DMA
:
4815 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4817 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4818 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4819 ap
->hsm_task_state
= HSM_ST_FIRST
;
4821 /* send cdb by polling if no cdb interrupt */
4822 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4823 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4828 return AC_ERR_SYSTEM
;
4835 * ata_host_intr - Handle host interrupt for given (port, task)
4836 * @ap: Port on which interrupt arrived (possibly...)
4837 * @qc: Taskfile currently active in engine
4839 * Handle host interrupt for given queued command. Currently,
4840 * only DMA interrupts are handled. All other commands are
4841 * handled via polling with interrupts disabled (nIEN bit).
4844 * spin_lock_irqsave(host_set lock)
4847 * One if interrupt was handled, zero if not (shared irq).
4850 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4851 struct ata_queued_cmd
*qc
)
4853 u8 status
, host_stat
= 0;
4855 VPRINTK("ata%u: protocol %d task_state %d\n",
4856 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4858 /* Check whether we are expecting interrupt in this state */
4859 switch (ap
->hsm_task_state
) {
4861 /* Some pre-ATAPI-4 devices assert INTRQ
4862 * at this state when ready to receive CDB.
4865 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4866 * The flag was turned on only for atapi devices.
4867 * No need to check is_atapi_taskfile(&qc->tf) again.
4869 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4873 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4874 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4875 /* check status of DMA engine */
4876 host_stat
= ap
->ops
->bmdma_status(ap
);
4877 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4879 /* if it's not our irq... */
4880 if (!(host_stat
& ATA_DMA_INTR
))
4883 /* before we do anything else, clear DMA-Start bit */
4884 ap
->ops
->bmdma_stop(qc
);
4886 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4887 /* error when transfering data to/from memory */
4888 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4889 ap
->hsm_task_state
= HSM_ST_ERR
;
4899 /* check altstatus */
4900 status
= ata_altstatus(ap
);
4901 if (status
& ATA_BUSY
)
4904 /* check main status, clearing INTRQ */
4905 status
= ata_chk_status(ap
);
4906 if (unlikely(status
& ATA_BUSY
))
4909 /* ack bmdma irq events */
4910 ap
->ops
->irq_clear(ap
);
4912 ata_hsm_move(ap
, qc
, status
, 0);
4913 return 1; /* irq handled */
4916 ap
->stats
.idle_irq
++;
4919 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4920 ata_irq_ack(ap
, 0); /* debug trap */
4921 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4925 return 0; /* irq not handled */
4929 * ata_interrupt - Default ATA host interrupt handler
4930 * @irq: irq line (unused)
4931 * @dev_instance: pointer to our ata_host_set information structure
4934 * Default interrupt handler for PCI IDE devices. Calls
4935 * ata_host_intr() for each port that is not disabled.
4938 * Obtains host_set lock during operation.
4941 * IRQ_NONE or IRQ_HANDLED.
4944 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4946 struct ata_host_set
*host_set
= dev_instance
;
4948 unsigned int handled
= 0;
4949 unsigned long flags
;
4951 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4952 spin_lock_irqsave(&host_set
->lock
, flags
);
4954 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4955 struct ata_port
*ap
;
4957 ap
= host_set
->ports
[i
];
4959 !(ap
->flags
& ATA_FLAG_DISABLED
)) {
4960 struct ata_queued_cmd
*qc
;
4962 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4963 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4964 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4965 handled
|= ata_host_intr(ap
, qc
);
4969 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4971 return IRQ_RETVAL(handled
);
4975 * sata_scr_valid - test whether SCRs are accessible
4976 * @ap: ATA port to test SCR accessibility for
4978 * Test whether SCRs are accessible for @ap.
4984 * 1 if SCRs are accessible, 0 otherwise.
4986 int sata_scr_valid(struct ata_port
*ap
)
4988 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4992 * sata_scr_read - read SCR register of the specified port
4993 * @ap: ATA port to read SCR for
4995 * @val: Place to store read value
4997 * Read SCR register @reg of @ap into *@val. This function is
4998 * guaranteed to succeed if the cable type of the port is SATA
4999 * and the port implements ->scr_read.
5005 * 0 on success, negative errno on failure.
5007 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
5009 if (sata_scr_valid(ap
)) {
5010 *val
= ap
->ops
->scr_read(ap
, reg
);
5017 * sata_scr_write - write SCR register of the specified port
5018 * @ap: ATA port to write SCR for
5019 * @reg: SCR to write
5020 * @val: value to write
5022 * Write @val to SCR register @reg of @ap. This function is
5023 * guaranteed to succeed if the cable type of the port is SATA
5024 * and the port implements ->scr_read.
5030 * 0 on success, negative errno on failure.
5032 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
5034 if (sata_scr_valid(ap
)) {
5035 ap
->ops
->scr_write(ap
, reg
, val
);
5042 * sata_scr_write_flush - write SCR register of the specified port and flush
5043 * @ap: ATA port to write SCR for
5044 * @reg: SCR to write
5045 * @val: value to write
5047 * This function is identical to sata_scr_write() except that this
5048 * function performs flush after writing to the register.
5054 * 0 on success, negative errno on failure.
5056 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
5058 if (sata_scr_valid(ap
)) {
5059 ap
->ops
->scr_write(ap
, reg
, val
);
5060 ap
->ops
->scr_read(ap
, reg
);
5067 * ata_port_online - test whether the given port is online
5068 * @ap: ATA port to test
5070 * Test whether @ap is online. Note that this function returns 0
5071 * if online status of @ap cannot be obtained, so
5072 * ata_port_online(ap) != !ata_port_offline(ap).
5078 * 1 if the port online status is available and online.
5080 int ata_port_online(struct ata_port
*ap
)
5084 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
5090 * ata_port_offline - test whether the given port is offline
5091 * @ap: ATA port to test
5093 * Test whether @ap is offline. Note that this function returns
5094 * 0 if offline status of @ap cannot be obtained, so
5095 * ata_port_online(ap) != !ata_port_offline(ap).
5101 * 1 if the port offline status is available and offline.
5103 int ata_port_offline(struct ata_port
*ap
)
5107 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
5113 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
5114 * without filling any other registers
5116 static int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
5118 struct ata_taskfile tf
;
5121 ata_tf_init(dev
, &tf
);
5124 tf
.flags
|= ATA_TFLAG_DEVICE
;
5125 tf
.protocol
= ATA_PROT_NODATA
;
5127 err
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
5129 ata_dev_printk(dev
, KERN_ERR
, "%s: ata command failed: %d\n",
5135 static int ata_flush_cache(struct ata_device
*dev
)
5139 if (!ata_try_flush_cache(dev
))
5142 if (ata_id_has_flush_ext(dev
->id
))
5143 cmd
= ATA_CMD_FLUSH_EXT
;
5145 cmd
= ATA_CMD_FLUSH
;
5147 return ata_do_simple_cmd(dev
, cmd
);
5150 static int ata_standby_drive(struct ata_device
*dev
)
5152 return ata_do_simple_cmd(dev
, ATA_CMD_STANDBYNOW1
);
5155 static int ata_start_drive(struct ata_device
*dev
)
5157 return ata_do_simple_cmd(dev
, ATA_CMD_IDLEIMMEDIATE
);
5161 * ata_device_resume - wakeup a previously suspended devices
5162 * @dev: the device to resume
5164 * Kick the drive back into action, by sending it an idle immediate
5165 * command and making sure its transfer mode matches between drive
5169 int ata_device_resume(struct ata_device
*dev
)
5171 struct ata_port
*ap
= dev
->ap
;
5173 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
5174 struct ata_device
*failed_dev
;
5176 ata_busy_wait(ap
, ATA_BUSY
| ATA_DRQ
, 200000);
5178 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
5179 while (ata_set_mode(ap
, &failed_dev
))
5180 ata_dev_disable(failed_dev
);
5182 if (!ata_dev_enabled(dev
))
5184 if (dev
->class == ATA_DEV_ATA
)
5185 ata_start_drive(dev
);
5191 * ata_device_suspend - prepare a device for suspend
5192 * @dev: the device to suspend
5193 * @state: target power management state
5195 * Flush the cache on the drive, if appropriate, then issue a
5196 * standbynow command.
5198 int ata_device_suspend(struct ata_device
*dev
, pm_message_t state
)
5200 struct ata_port
*ap
= dev
->ap
;
5202 if (!ata_dev_enabled(dev
))
5204 if (dev
->class == ATA_DEV_ATA
)
5205 ata_flush_cache(dev
);
5207 if (state
.event
!= PM_EVENT_FREEZE
)
5208 ata_standby_drive(dev
);
5209 ap
->flags
|= ATA_FLAG_SUSPENDED
;
5214 * ata_port_start - Set port up for dma.
5215 * @ap: Port to initialize
5217 * Called just after data structures for each port are
5218 * initialized. Allocates space for PRD table.
5220 * May be used as the port_start() entry in ata_port_operations.
5223 * Inherited from caller.
5226 int ata_port_start (struct ata_port
*ap
)
5228 struct device
*dev
= ap
->dev
;
5231 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
5235 rc
= ata_pad_alloc(ap
, dev
);
5237 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5241 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
5248 * ata_port_stop - Undo ata_port_start()
5249 * @ap: Port to shut down
5251 * Frees the PRD table.
5253 * May be used as the port_stop() entry in ata_port_operations.
5256 * Inherited from caller.
5259 void ata_port_stop (struct ata_port
*ap
)
5261 struct device
*dev
= ap
->dev
;
5263 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
5264 ata_pad_free(ap
, dev
);
5267 void ata_host_stop (struct ata_host_set
*host_set
)
5269 if (host_set
->mmio_base
)
5270 iounmap(host_set
->mmio_base
);
5275 * ata_host_remove - Unregister SCSI host structure with upper layers
5276 * @ap: Port to unregister
5277 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
5280 * Inherited from caller.
5283 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
5285 struct Scsi_Host
*sh
= ap
->host
;
5290 scsi_remove_host(sh
);
5292 ap
->ops
->port_stop(ap
);
5296 * ata_dev_init - Initialize an ata_device structure
5297 * @dev: Device structure to initialize
5299 * Initialize @dev in preparation for probing.
5302 * Inherited from caller.
5304 void ata_dev_init(struct ata_device
*dev
)
5306 struct ata_port
*ap
= dev
->ap
;
5307 unsigned long flags
;
5309 /* SATA spd limit is bound to the first device */
5310 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5312 /* High bits of dev->flags are used to record warm plug
5313 * requests which occur asynchronously. Synchronize using
5316 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
5317 dev
->flags
&= ~ATA_DFLAG_INIT_MASK
;
5318 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
5320 memset((void *)dev
+ ATA_DEVICE_CLEAR_OFFSET
, 0,
5321 sizeof(*dev
) - ATA_DEVICE_CLEAR_OFFSET
);
5322 dev
->pio_mask
= UINT_MAX
;
5323 dev
->mwdma_mask
= UINT_MAX
;
5324 dev
->udma_mask
= UINT_MAX
;
5328 * ata_host_init - Initialize an ata_port structure
5329 * @ap: Structure to initialize
5330 * @host: associated SCSI mid-layer structure
5331 * @host_set: Collection of hosts to which @ap belongs
5332 * @ent: Probe information provided by low-level driver
5333 * @port_no: Port number associated with this ata_port
5335 * Initialize a new ata_port structure, and its associated
5339 * Inherited from caller.
5341 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
5342 struct ata_host_set
*host_set
,
5343 const struct ata_probe_ent
*ent
, unsigned int port_no
)
5349 host
->max_channel
= 1;
5350 host
->unique_id
= ata_unique_id
++;
5351 host
->max_cmd_len
= 12;
5353 ap
->flags
= ATA_FLAG_DISABLED
;
5354 ap
->id
= host
->unique_id
;
5356 ap
->ctl
= ATA_DEVCTL_OBS
;
5357 ap
->host_set
= host_set
;
5359 ap
->port_no
= port_no
;
5361 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
5362 ap
->pio_mask
= ent
->pio_mask
;
5363 ap
->mwdma_mask
= ent
->mwdma_mask
;
5364 ap
->udma_mask
= ent
->udma_mask
;
5365 ap
->flags
|= ent
->host_flags
;
5366 ap
->ops
= ent
->port_ops
;
5367 ap
->hw_sata_spd_limit
= UINT_MAX
;
5368 ap
->active_tag
= ATA_TAG_POISON
;
5369 ap
->last_ctl
= 0xFF;
5370 ap
->msg_enable
= ATA_MSG_DRV
;
5372 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
5373 INIT_WORK(&ap
->hotplug_task
, ata_scsi_hotplug
, ap
);
5374 INIT_LIST_HEAD(&ap
->eh_done_q
);
5375 init_waitqueue_head(&ap
->eh_wait_q
);
5377 /* set cable type */
5378 ap
->cbl
= ATA_CBL_NONE
;
5379 if (ap
->flags
& ATA_FLAG_SATA
)
5380 ap
->cbl
= ATA_CBL_SATA
;
5382 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
5383 struct ata_device
*dev
= &ap
->device
[i
];
5390 ap
->stats
.unhandled_irq
= 1;
5391 ap
->stats
.idle_irq
= 1;
5394 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
5398 * ata_host_add - Attach low-level ATA driver to system
5399 * @ent: Information provided by low-level driver
5400 * @host_set: Collections of ports to which we add
5401 * @port_no: Port number associated with this host
5403 * Attach low-level ATA driver to system.
5406 * PCI/etc. bus probe sem.
5409 * New ata_port on success, for NULL on error.
5412 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
5413 struct ata_host_set
*host_set
,
5414 unsigned int port_no
)
5416 struct Scsi_Host
*host
;
5417 struct ata_port
*ap
;
5422 if (!ent
->port_ops
->probe_reset
&&
5423 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
5424 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
5429 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
5433 host
->transportt
= &ata_scsi_transport_template
;
5435 ap
= ata_shost_to_port(host
);
5437 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
5439 rc
= ap
->ops
->port_start(ap
);
5446 scsi_host_put(host
);
5451 * ata_device_add - Register hardware device with ATA and SCSI layers
5452 * @ent: Probe information describing hardware device to be registered
5454 * This function processes the information provided in the probe
5455 * information struct @ent, allocates the necessary ATA and SCSI
5456 * host information structures, initializes them, and registers
5457 * everything with requisite kernel subsystems.
5459 * This function requests irqs, probes the ATA bus, and probes
5463 * PCI/etc. bus probe sem.
5466 * Number of ports registered. Zero on error (no ports registered).
5469 int ata_device_add(const struct ata_probe_ent
*ent
)
5471 unsigned int count
= 0, i
;
5472 struct device
*dev
= ent
->dev
;
5473 struct ata_host_set
*host_set
;
5476 /* alloc a container for our list of ATA ports (buses) */
5477 host_set
= kzalloc(sizeof(struct ata_host_set
) +
5478 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
5481 spin_lock_init(&host_set
->lock
);
5483 host_set
->dev
= dev
;
5484 host_set
->n_ports
= ent
->n_ports
;
5485 host_set
->irq
= ent
->irq
;
5486 host_set
->mmio_base
= ent
->mmio_base
;
5487 host_set
->private_data
= ent
->private_data
;
5488 host_set
->ops
= ent
->port_ops
;
5489 host_set
->flags
= ent
->host_set_flags
;
5491 /* register each port bound to this device */
5492 for (i
= 0; i
< ent
->n_ports
; i
++) {
5493 struct ata_port
*ap
;
5494 unsigned long xfer_mode_mask
;
5496 ap
= ata_host_add(ent
, host_set
, i
);
5500 host_set
->ports
[i
] = ap
;
5501 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
5502 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
5503 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
5505 /* print per-port info to dmesg */
5506 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
5507 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
5508 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
5509 ata_mode_string(xfer_mode_mask
),
5510 ap
->ioaddr
.cmd_addr
,
5511 ap
->ioaddr
.ctl_addr
,
5512 ap
->ioaddr
.bmdma_addr
,
5516 host_set
->ops
->irq_clear(ap
);
5517 ata_eh_freeze_port(ap
); /* freeze port before requesting IRQ */
5524 /* obtain irq, that is shared between channels */
5525 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5526 DRV_NAME
, host_set
))
5529 /* perform each probe synchronously */
5530 DPRINTK("probe begin\n");
5531 for (i
= 0; i
< count
; i
++) {
5532 struct ata_port
*ap
;
5536 ap
= host_set
->ports
[i
];
5538 /* init sata_spd_limit to the current value */
5539 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
5540 int spd
= (scontrol
>> 4) & 0xf;
5541 ap
->hw_sata_spd_limit
&= (1 << spd
) - 1;
5543 ap
->sata_spd_limit
= ap
->hw_sata_spd_limit
;
5545 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5546 rc
= ata_bus_probe(ap
);
5547 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5550 /* FIXME: do something useful here?
5551 * Current libata behavior will
5552 * tear down everything when
5553 * the module is removed
5554 * or the h/w is unplugged.
5558 rc
= scsi_add_host(ap
->host
, dev
);
5560 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
5561 /* FIXME: do something useful here */
5562 /* FIXME: handle unconditional calls to
5563 * scsi_scan_host and ata_host_remove, below,
5569 /* probes are done, now scan each port's disk(s) */
5570 DPRINTK("host probe begin\n");
5571 for (i
= 0; i
< count
; i
++) {
5572 struct ata_port
*ap
= host_set
->ports
[i
];
5574 ata_scsi_scan_host(ap
);
5577 dev_set_drvdata(dev
, host_set
);
5579 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5580 return ent
->n_ports
; /* success */
5583 for (i
= 0; i
< count
; i
++) {
5584 ata_host_remove(host_set
->ports
[i
], 1);
5585 scsi_host_put(host_set
->ports
[i
]->host
);
5589 VPRINTK("EXIT, returning 0\n");
5594 * ata_host_set_remove - PCI layer callback for device removal
5595 * @host_set: ATA host set that was removed
5597 * Unregister all objects associated with this host set. Free those
5601 * Inherited from calling layer (may sleep).
5604 void ata_host_set_remove(struct ata_host_set
*host_set
)
5606 struct ata_port
*ap
;
5609 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5610 ap
= host_set
->ports
[i
];
5611 scsi_remove_host(ap
->host
);
5614 free_irq(host_set
->irq
, host_set
);
5616 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5617 ap
= host_set
->ports
[i
];
5619 ata_scsi_release(ap
->host
);
5621 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5622 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5624 if (ioaddr
->cmd_addr
== 0x1f0)
5625 release_region(0x1f0, 8);
5626 else if (ioaddr
->cmd_addr
== 0x170)
5627 release_region(0x170, 8);
5630 scsi_host_put(ap
->host
);
5633 if (host_set
->ops
->host_stop
)
5634 host_set
->ops
->host_stop(host_set
);
5640 * ata_scsi_release - SCSI layer callback hook for host unload
5641 * @host: libata host to be unloaded
5643 * Performs all duties necessary to shut down a libata port...
5644 * Kill port kthread, disable port, and release resources.
5647 * Inherited from SCSI layer.
5653 int ata_scsi_release(struct Scsi_Host
*host
)
5655 struct ata_port
*ap
= ata_shost_to_port(host
);
5659 ap
->ops
->port_disable(ap
);
5660 ata_host_remove(ap
, 0);
5667 * ata_std_ports - initialize ioaddr with standard port offsets.
5668 * @ioaddr: IO address structure to be initialized
5670 * Utility function which initializes data_addr, error_addr,
5671 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5672 * device_addr, status_addr, and command_addr to standard offsets
5673 * relative to cmd_addr.
5675 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5678 void ata_std_ports(struct ata_ioports
*ioaddr
)
5680 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5681 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5682 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5683 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5684 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5685 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5686 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5687 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5688 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5689 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5695 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5697 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5699 pci_iounmap(pdev
, host_set
->mmio_base
);
5703 * ata_pci_remove_one - PCI layer callback for device removal
5704 * @pdev: PCI device that was removed
5706 * PCI layer indicates to libata via this hook that
5707 * hot-unplug or module unload event has occurred.
5708 * Handle this by unregistering all objects associated
5709 * with this PCI device. Free those objects. Then finally
5710 * release PCI resources and disable device.
5713 * Inherited from PCI layer (may sleep).
5716 void ata_pci_remove_one (struct pci_dev
*pdev
)
5718 struct device
*dev
= pci_dev_to_dev(pdev
);
5719 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5721 ata_host_set_remove(host_set
);
5722 pci_release_regions(pdev
);
5723 pci_disable_device(pdev
);
5724 dev_set_drvdata(dev
, NULL
);
5727 /* move to PCI subsystem */
5728 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5730 unsigned long tmp
= 0;
5732 switch (bits
->width
) {
5735 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5741 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5747 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5758 return (tmp
== bits
->val
) ? 1 : 0;
5761 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5763 pci_save_state(pdev
);
5764 pci_disable_device(pdev
);
5765 pci_set_power_state(pdev
, PCI_D3hot
);
5769 int ata_pci_device_resume(struct pci_dev
*pdev
)
5771 pci_set_power_state(pdev
, PCI_D0
);
5772 pci_restore_state(pdev
);
5773 pci_enable_device(pdev
);
5774 pci_set_master(pdev
);
5777 #endif /* CONFIG_PCI */
5780 static int __init
ata_init(void)
5782 ata_wq
= create_workqueue("ata");
5786 ata_aux_wq
= create_singlethread_workqueue("ata_aux");
5788 destroy_workqueue(ata_wq
);
5792 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5796 static void __exit
ata_exit(void)
5798 destroy_workqueue(ata_wq
);
5799 destroy_workqueue(ata_aux_wq
);
5802 module_init(ata_init
);
5803 module_exit(ata_exit
);
5805 static unsigned long ratelimit_time
;
5806 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5808 int ata_ratelimit(void)
5811 unsigned long flags
;
5813 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5815 if (time_after(jiffies
, ratelimit_time
)) {
5817 ratelimit_time
= jiffies
+ (HZ
/5);
5821 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5827 * ata_wait_register - wait until register value changes
5828 * @reg: IO-mapped register
5829 * @mask: Mask to apply to read register value
5830 * @val: Wait condition
5831 * @interval_msec: polling interval in milliseconds
5832 * @timeout_msec: timeout in milliseconds
5834 * Waiting for some bits of register to change is a common
5835 * operation for ATA controllers. This function reads 32bit LE
5836 * IO-mapped register @reg and tests for the following condition.
5838 * (*@reg & mask) != val
5840 * If the condition is met, it returns; otherwise, the process is
5841 * repeated after @interval_msec until timeout.
5844 * Kernel thread context (may sleep)
5847 * The final register value.
5849 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5850 unsigned long interval_msec
,
5851 unsigned long timeout_msec
)
5853 unsigned long timeout
;
5856 tmp
= ioread32(reg
);
5858 /* Calculate timeout _after_ the first read to make sure
5859 * preceding writes reach the controller before starting to
5860 * eat away the timeout.
5862 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5864 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5865 msleep(interval_msec
);
5866 tmp
= ioread32(reg
);
5873 * libata is essentially a library of internal helper functions for
5874 * low-level ATA host controller drivers. As such, the API/ABI is
5875 * likely to change as new drivers are added and updated.
5876 * Do not depend on ABI/API stability.
5879 EXPORT_SYMBOL_GPL(sata_deb_timing_boot
);
5880 EXPORT_SYMBOL_GPL(sata_deb_timing_eh
);
5881 EXPORT_SYMBOL_GPL(sata_deb_timing_before_fsrst
);
5882 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5883 EXPORT_SYMBOL_GPL(ata_std_ports
);
5884 EXPORT_SYMBOL_GPL(ata_device_add
);
5885 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5886 EXPORT_SYMBOL_GPL(ata_sg_init
);
5887 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5888 EXPORT_SYMBOL_GPL(ata_hsm_move
);
5889 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5890 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple
);
5891 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5892 EXPORT_SYMBOL_GPL(ata_tf_load
);
5893 EXPORT_SYMBOL_GPL(ata_tf_read
);
5894 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5895 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5896 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5897 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5898 EXPORT_SYMBOL_GPL(ata_check_status
);
5899 EXPORT_SYMBOL_GPL(ata_altstatus
);
5900 EXPORT_SYMBOL_GPL(ata_exec_command
);
5901 EXPORT_SYMBOL_GPL(ata_port_start
);
5902 EXPORT_SYMBOL_GPL(ata_port_stop
);
5903 EXPORT_SYMBOL_GPL(ata_host_stop
);
5904 EXPORT_SYMBOL_GPL(ata_interrupt
);
5905 EXPORT_SYMBOL_GPL(ata_mmio_data_xfer
);
5906 EXPORT_SYMBOL_GPL(ata_pio_data_xfer
);
5907 EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq
);
5908 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5909 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5910 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5911 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5912 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5913 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5914 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5915 EXPORT_SYMBOL_GPL(ata_bmdma_freeze
);
5916 EXPORT_SYMBOL_GPL(ata_bmdma_thaw
);
5917 EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh
);
5918 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler
);
5919 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd
);
5920 EXPORT_SYMBOL_GPL(ata_port_probe
);
5921 EXPORT_SYMBOL_GPL(sata_set_spd
);
5922 EXPORT_SYMBOL_GPL(sata_phy_debounce
);
5923 EXPORT_SYMBOL_GPL(sata_phy_resume
);
5924 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5925 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5926 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5927 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5928 EXPORT_SYMBOL_GPL(ata_std_prereset
);
5929 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5930 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5931 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5932 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5933 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5934 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5935 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5936 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5937 EXPORT_SYMBOL_GPL(ata_port_disable
);
5938 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5939 EXPORT_SYMBOL_GPL(ata_wait_register
);
5940 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5941 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5942 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5943 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5944 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5945 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy
);
5946 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth
);
5947 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5948 EXPORT_SYMBOL_GPL(ata_host_intr
);
5949 EXPORT_SYMBOL_GPL(sata_scr_valid
);
5950 EXPORT_SYMBOL_GPL(sata_scr_read
);
5951 EXPORT_SYMBOL_GPL(sata_scr_write
);
5952 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
5953 EXPORT_SYMBOL_GPL(ata_port_online
);
5954 EXPORT_SYMBOL_GPL(ata_port_offline
);
5955 EXPORT_SYMBOL_GPL(ata_id_string
);
5956 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5957 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5959 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5960 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5961 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5964 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5965 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5966 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5967 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5968 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5969 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5970 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5971 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5972 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5973 #endif /* CONFIG_PCI */
5975 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5976 EXPORT_SYMBOL_GPL(ata_device_resume
);
5977 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5978 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5980 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5981 EXPORT_SYMBOL_GPL(ata_port_schedule_eh
);
5982 EXPORT_SYMBOL_GPL(ata_port_abort
);
5983 EXPORT_SYMBOL_GPL(ata_port_freeze
);
5984 EXPORT_SYMBOL_GPL(ata_eh_freeze_port
);
5985 EXPORT_SYMBOL_GPL(ata_eh_thaw_port
);
5986 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5987 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5988 EXPORT_SYMBOL_GPL(ata_do_eh
);