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 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
65 struct ata_device
*dev
,
68 static void ata_set_mode(struct ata_port
*ap
);
69 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
70 struct ata_device
*dev
);
71 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
);
73 static unsigned int ata_unique_id
= 1;
74 static struct workqueue_struct
*ata_wq
;
76 int atapi_enabled
= 1;
77 module_param(atapi_enabled
, int, 0444);
78 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
81 module_param_named(fua
, libata_fua
, int, 0444);
82 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
84 MODULE_AUTHOR("Jeff Garzik");
85 MODULE_DESCRIPTION("Library module for ATA devices");
86 MODULE_LICENSE("GPL");
87 MODULE_VERSION(DRV_VERSION
);
91 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
92 * @tf: Taskfile to convert
93 * @fis: Buffer into which data will output
94 * @pmp: Port multiplier port
96 * Converts a standard ATA taskfile to a Serial ATA
97 * FIS structure (Register - Host to Device).
100 * Inherited from caller.
103 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
105 fis
[0] = 0x27; /* Register - Host to Device FIS */
106 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
107 bit 7 indicates Command FIS */
108 fis
[2] = tf
->command
;
109 fis
[3] = tf
->feature
;
116 fis
[8] = tf
->hob_lbal
;
117 fis
[9] = tf
->hob_lbam
;
118 fis
[10] = tf
->hob_lbah
;
119 fis
[11] = tf
->hob_feature
;
122 fis
[13] = tf
->hob_nsect
;
133 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
134 * @fis: Buffer from which data will be input
135 * @tf: Taskfile to output
137 * Converts a serial ATA FIS structure to a standard ATA taskfile.
140 * Inherited from caller.
143 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
145 tf
->command
= fis
[2]; /* status */
146 tf
->feature
= fis
[3]; /* error */
153 tf
->hob_lbal
= fis
[8];
154 tf
->hob_lbam
= fis
[9];
155 tf
->hob_lbah
= fis
[10];
158 tf
->hob_nsect
= fis
[13];
161 static const u8 ata_rw_cmds
[] = {
165 ATA_CMD_READ_MULTI_EXT
,
166 ATA_CMD_WRITE_MULTI_EXT
,
170 ATA_CMD_WRITE_MULTI_FUA_EXT
,
174 ATA_CMD_PIO_READ_EXT
,
175 ATA_CMD_PIO_WRITE_EXT
,
188 ATA_CMD_WRITE_FUA_EXT
192 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
193 * @qc: command to examine and configure
195 * Examine the device configuration and tf->flags to calculate
196 * the proper read/write commands and protocol to use.
201 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
203 struct ata_taskfile
*tf
= &qc
->tf
;
204 struct ata_device
*dev
= qc
->dev
;
207 int index
, fua
, lba48
, write
;
209 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
210 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
211 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
213 if (dev
->flags
& ATA_DFLAG_PIO
) {
214 tf
->protocol
= ATA_PROT_PIO
;
215 index
= dev
->multi_count
? 0 : 8;
216 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
217 /* Unable to use DMA due to host limitation */
218 tf
->protocol
= ATA_PROT_PIO
;
219 index
= dev
->multi_count
? 0 : 8;
221 tf
->protocol
= ATA_PROT_DMA
;
225 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
234 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
235 * @pio_mask: pio_mask
236 * @mwdma_mask: mwdma_mask
237 * @udma_mask: udma_mask
239 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
240 * unsigned int xfer_mask.
248 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
249 unsigned int mwdma_mask
,
250 unsigned int udma_mask
)
252 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
253 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
254 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
258 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
259 * @xfer_mask: xfer_mask to unpack
260 * @pio_mask: resulting pio_mask
261 * @mwdma_mask: resulting mwdma_mask
262 * @udma_mask: resulting udma_mask
264 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
265 * Any NULL distination masks will be ignored.
267 static void ata_unpack_xfermask(unsigned int xfer_mask
,
268 unsigned int *pio_mask
,
269 unsigned int *mwdma_mask
,
270 unsigned int *udma_mask
)
273 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
275 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
277 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
280 static const struct ata_xfer_ent
{
281 unsigned int shift
, bits
;
284 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
285 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
286 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
291 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
292 * @xfer_mask: xfer_mask of interest
294 * Return matching XFER_* value for @xfer_mask. Only the highest
295 * bit of @xfer_mask is considered.
301 * Matching XFER_* value, 0 if no match found.
303 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
305 int highbit
= fls(xfer_mask
) - 1;
306 const struct ata_xfer_ent
*ent
;
308 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
309 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
310 return ent
->base
+ highbit
- ent
->shift
;
315 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
316 * @xfer_mode: XFER_* of interest
318 * Return matching xfer_mask for @xfer_mode.
324 * Matching xfer_mask, 0 if no match found.
326 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
328 const struct ata_xfer_ent
*ent
;
330 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
331 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
332 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
337 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
338 * @xfer_mode: XFER_* of interest
340 * Return matching xfer_shift for @xfer_mode.
346 * Matching xfer_shift, -1 if no match found.
348 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
350 const struct ata_xfer_ent
*ent
;
352 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
353 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
359 * ata_mode_string - convert xfer_mask to string
360 * @xfer_mask: mask of bits supported; only highest bit counts.
362 * Determine string which represents the highest speed
363 * (highest bit in @modemask).
369 * Constant C string representing highest speed listed in
370 * @mode_mask, or the constant C string "<n/a>".
372 static const char *ata_mode_string(unsigned int xfer_mask
)
374 static const char * const xfer_mode_str
[] = {
394 highbit
= fls(xfer_mask
) - 1;
395 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
396 return xfer_mode_str
[highbit
];
400 static void ata_dev_disable(struct ata_port
*ap
, struct ata_device
*dev
)
402 if (ata_dev_present(dev
)) {
403 printk(KERN_WARNING
"ata%u: dev %u disabled\n",
410 * ata_pio_devchk - PATA device presence detection
411 * @ap: ATA channel to examine
412 * @device: Device to examine (starting at zero)
414 * This technique was originally described in
415 * Hale Landis's ATADRVR (www.ata-atapi.com), and
416 * later found its way into the ATA/ATAPI spec.
418 * Write a pattern to the ATA shadow registers,
419 * and if a device is present, it will respond by
420 * correctly storing and echoing back the
421 * ATA shadow register contents.
427 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
430 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
433 ap
->ops
->dev_select(ap
, device
);
435 outb(0x55, ioaddr
->nsect_addr
);
436 outb(0xaa, ioaddr
->lbal_addr
);
438 outb(0xaa, ioaddr
->nsect_addr
);
439 outb(0x55, ioaddr
->lbal_addr
);
441 outb(0x55, ioaddr
->nsect_addr
);
442 outb(0xaa, ioaddr
->lbal_addr
);
444 nsect
= inb(ioaddr
->nsect_addr
);
445 lbal
= inb(ioaddr
->lbal_addr
);
447 if ((nsect
== 0x55) && (lbal
== 0xaa))
448 return 1; /* we found a device */
450 return 0; /* nothing found */
454 * ata_mmio_devchk - PATA device presence detection
455 * @ap: ATA channel to examine
456 * @device: Device to examine (starting at zero)
458 * This technique was originally described in
459 * Hale Landis's ATADRVR (www.ata-atapi.com), and
460 * later found its way into the ATA/ATAPI spec.
462 * Write a pattern to the ATA shadow registers,
463 * and if a device is present, it will respond by
464 * correctly storing and echoing back the
465 * ATA shadow register contents.
471 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
474 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
477 ap
->ops
->dev_select(ap
, device
);
479 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
480 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
482 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
483 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
485 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
486 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
488 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
489 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
491 if ((nsect
== 0x55) && (lbal
== 0xaa))
492 return 1; /* we found a device */
494 return 0; /* nothing found */
498 * ata_devchk - PATA device presence detection
499 * @ap: ATA channel to examine
500 * @device: Device to examine (starting at zero)
502 * Dispatch ATA device presence detection, depending
503 * on whether we are using PIO or MMIO to talk to the
504 * ATA shadow registers.
510 static unsigned int ata_devchk(struct ata_port
*ap
,
513 if (ap
->flags
& ATA_FLAG_MMIO
)
514 return ata_mmio_devchk(ap
, device
);
515 return ata_pio_devchk(ap
, device
);
519 * ata_dev_classify - determine device type based on ATA-spec signature
520 * @tf: ATA taskfile register set for device to be identified
522 * Determine from taskfile register contents whether a device is
523 * ATA or ATAPI, as per "Signature and persistence" section
524 * of ATA/PI spec (volume 1, sect 5.14).
530 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
531 * the event of failure.
534 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
536 /* Apple's open source Darwin code hints that some devices only
537 * put a proper signature into the LBA mid/high registers,
538 * So, we only check those. It's sufficient for uniqueness.
541 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
542 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
543 DPRINTK("found ATA device by sig\n");
547 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
548 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
549 DPRINTK("found ATAPI device by sig\n");
550 return ATA_DEV_ATAPI
;
553 DPRINTK("unknown device\n");
554 return ATA_DEV_UNKNOWN
;
558 * ata_dev_try_classify - Parse returned ATA device signature
559 * @ap: ATA channel to examine
560 * @device: Device to examine (starting at zero)
561 * @r_err: Value of error register on completion
563 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
564 * an ATA/ATAPI-defined set of values is placed in the ATA
565 * shadow registers, indicating the results of device detection
568 * Select the ATA device, and read the values from the ATA shadow
569 * registers. Then parse according to the Error register value,
570 * and the spec-defined values examined by ata_dev_classify().
576 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
580 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
582 struct ata_taskfile tf
;
586 ap
->ops
->dev_select(ap
, device
);
588 memset(&tf
, 0, sizeof(tf
));
590 ap
->ops
->tf_read(ap
, &tf
);
595 /* see if device passed diags */
598 else if ((device
== 0) && (err
== 0x81))
603 /* determine if device is ATA or ATAPI */
604 class = ata_dev_classify(&tf
);
606 if (class == ATA_DEV_UNKNOWN
)
608 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
614 * ata_id_string - Convert IDENTIFY DEVICE page into string
615 * @id: IDENTIFY DEVICE results we will examine
616 * @s: string into which data is output
617 * @ofs: offset into identify device page
618 * @len: length of string to return. must be an even number.
620 * The strings in the IDENTIFY DEVICE page are broken up into
621 * 16-bit chunks. Run through the string, and output each
622 * 8-bit chunk linearly, regardless of platform.
628 void ata_id_string(const u16
*id
, unsigned char *s
,
629 unsigned int ofs
, unsigned int len
)
648 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
649 * @id: IDENTIFY DEVICE results we will examine
650 * @s: string into which data is output
651 * @ofs: offset into identify device page
652 * @len: length of string to return. must be an odd number.
654 * This function is identical to ata_id_string except that it
655 * trims trailing spaces and terminates the resulting string with
656 * null. @len must be actual maximum length (even number) + 1.
661 void ata_id_c_string(const u16
*id
, unsigned char *s
,
662 unsigned int ofs
, unsigned int len
)
668 ata_id_string(id
, s
, ofs
, len
- 1);
670 p
= s
+ strnlen(s
, len
- 1);
671 while (p
> s
&& p
[-1] == ' ')
676 static u64
ata_id_n_sectors(const u16
*id
)
678 if (ata_id_has_lba(id
)) {
679 if (ata_id_has_lba48(id
))
680 return ata_id_u64(id
, 100);
682 return ata_id_u32(id
, 60);
684 if (ata_id_current_chs_valid(id
))
685 return ata_id_u32(id
, 57);
687 return id
[1] * id
[3] * id
[6];
692 * ata_noop_dev_select - Select device 0/1 on ATA bus
693 * @ap: ATA channel to manipulate
694 * @device: ATA device (numbered from zero) to select
696 * This function performs no actual function.
698 * May be used as the dev_select() entry in ata_port_operations.
703 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
709 * ata_std_dev_select - Select device 0/1 on ATA bus
710 * @ap: ATA channel to manipulate
711 * @device: ATA device (numbered from zero) to select
713 * Use the method defined in the ATA specification to
714 * make either device 0, or device 1, active on the
715 * ATA channel. Works with both PIO and MMIO.
717 * May be used as the dev_select() entry in ata_port_operations.
723 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
728 tmp
= ATA_DEVICE_OBS
;
730 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
732 if (ap
->flags
& ATA_FLAG_MMIO
) {
733 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
735 outb(tmp
, ap
->ioaddr
.device_addr
);
737 ata_pause(ap
); /* needed; also flushes, for mmio */
741 * ata_dev_select - Select device 0/1 on ATA bus
742 * @ap: ATA channel to manipulate
743 * @device: ATA device (numbered from zero) to select
744 * @wait: non-zero to wait for Status register BSY bit to clear
745 * @can_sleep: non-zero if context allows sleeping
747 * Use the method defined in the ATA specification to
748 * make either device 0, or device 1, active on the
751 * This is a high-level version of ata_std_dev_select(),
752 * which additionally provides the services of inserting
753 * the proper pauses and status polling, where needed.
759 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
760 unsigned int wait
, unsigned int can_sleep
)
762 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
763 ap
->id
, device
, wait
);
768 ap
->ops
->dev_select(ap
, device
);
771 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
778 * ata_dump_id - IDENTIFY DEVICE info debugging output
779 * @id: IDENTIFY DEVICE page to dump
781 * Dump selected 16-bit words from the given IDENTIFY DEVICE
788 static inline void ata_dump_id(const u16
*id
)
790 DPRINTK("49==0x%04x "
800 DPRINTK("80==0x%04x "
810 DPRINTK("88==0x%04x "
817 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
818 * @id: IDENTIFY data to compute xfer mask from
820 * Compute the xfermask for this device. This is not as trivial
821 * as it seems if we must consider early devices correctly.
823 * FIXME: pre IDE drive timing (do we care ?).
831 static unsigned int ata_id_xfermask(const u16
*id
)
833 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
835 /* Usual case. Word 53 indicates word 64 is valid */
836 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
837 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
841 /* If word 64 isn't valid then Word 51 high byte holds
842 * the PIO timing number for the maximum. Turn it into
845 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
847 /* But wait.. there's more. Design your standards by
848 * committee and you too can get a free iordy field to
849 * process. However its the speeds not the modes that
850 * are supported... Note drivers using the timing API
851 * will get this right anyway
855 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
858 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
859 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
861 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
865 * ata_port_queue_task - Queue port_task
866 * @ap: The ata_port to queue port_task for
868 * Schedule @fn(@data) for execution after @delay jiffies using
869 * port_task. There is one port_task per port and it's the
870 * user(low level driver)'s responsibility to make sure that only
871 * one task is active at any given time.
873 * libata core layer takes care of synchronization between
874 * port_task and EH. ata_port_queue_task() may be ignored for EH
878 * Inherited from caller.
880 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
885 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
888 PREPARE_WORK(&ap
->port_task
, fn
, data
);
891 rc
= queue_work(ata_wq
, &ap
->port_task
);
893 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
895 /* rc == 0 means that another user is using port task */
900 * ata_port_flush_task - Flush port_task
901 * @ap: The ata_port to flush port_task for
903 * After this function completes, port_task is guranteed not to
904 * be running or scheduled.
907 * Kernel thread context (may sleep)
909 void ata_port_flush_task(struct ata_port
*ap
)
915 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
916 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
917 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
919 DPRINTK("flush #1\n");
920 flush_workqueue(ata_wq
);
923 * At this point, if a task is running, it's guaranteed to see
924 * the FLUSH flag; thus, it will never queue pio tasks again.
927 if (!cancel_delayed_work(&ap
->port_task
)) {
928 DPRINTK("flush #2\n");
929 flush_workqueue(ata_wq
);
932 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
933 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
934 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
939 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
941 struct completion
*waiting
= qc
->private_data
;
943 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
948 * ata_exec_internal - execute libata internal command
949 * @ap: Port to which the command is sent
950 * @dev: Device to which the command is sent
951 * @tf: Taskfile registers for the command and the result
952 * @dma_dir: Data tranfer direction of the command
953 * @buf: Data buffer of the command
954 * @buflen: Length of data buffer
956 * Executes libata internal command with timeout. @tf contains
957 * command on entry and result on return. Timeout and error
958 * conditions are reported via return value. No recovery action
959 * is taken after a command times out. It's caller's duty to
960 * clean up after timeout.
963 * None. Should be called with kernel context, might sleep.
967 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
968 struct ata_taskfile
*tf
,
969 int dma_dir
, void *buf
, unsigned int buflen
)
971 u8 command
= tf
->command
;
972 struct ata_queued_cmd
*qc
;
973 DECLARE_COMPLETION(wait
);
975 unsigned int err_mask
;
977 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
979 qc
= ata_qc_new_init(ap
, dev
);
983 qc
->dma_dir
= dma_dir
;
984 if (dma_dir
!= DMA_NONE
) {
985 ata_sg_init_one(qc
, buf
, buflen
);
986 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
989 qc
->private_data
= &wait
;
990 qc
->complete_fn
= ata_qc_complete_internal
;
992 qc
->err_mask
= ata_qc_issue(qc
);
996 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
998 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
999 ata_port_flush_task(ap
);
1001 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1003 /* We're racing with irq here. If we lose, the
1004 * following test prevents us from completing the qc
1005 * again. If completion irq occurs after here but
1006 * before the caller cleans up, it will result in a
1007 * spurious interrupt. We can live with that.
1009 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1010 qc
->err_mask
= AC_ERR_TIMEOUT
;
1011 ata_qc_complete(qc
);
1012 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1016 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1020 err_mask
= qc
->err_mask
;
1024 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1025 * Until those drivers are fixed, we detect the condition
1026 * here, fail the command with AC_ERR_SYSTEM and reenable the
1029 * Note that this doesn't change any behavior as internal
1030 * command failure results in disabling the device in the
1031 * higher layer for LLDDs without new reset/EH callbacks.
1033 * Kill the following code as soon as those drivers are fixed.
1035 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
) {
1036 err_mask
|= AC_ERR_SYSTEM
;
1044 * ata_pio_need_iordy - check if iordy needed
1047 * Check if the current speed of the device requires IORDY. Used
1048 * by various controllers for chip configuration.
1051 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1054 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1061 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1063 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1064 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1065 /* Is the speed faster than the drive allows non IORDY ? */
1067 /* This is cycle times not frequency - watch the logic! */
1068 if (pio
> 240) /* PIO2 is 240nS per cycle */
1077 * ata_dev_read_id - Read ID data from the specified device
1078 * @ap: port on which target device resides
1079 * @dev: target device
1080 * @p_class: pointer to class of the target device (may be changed)
1081 * @post_reset: is this read ID post-reset?
1082 * @p_id: read IDENTIFY page (newly allocated)
1084 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1085 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1086 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1087 * for pre-ATA4 drives.
1090 * Kernel thread context (may sleep)
1093 * 0 on success, -errno otherwise.
1095 static int ata_dev_read_id(struct ata_port
*ap
, struct ata_device
*dev
,
1096 unsigned int *p_class
, int post_reset
, u16
**p_id
)
1098 unsigned int class = *p_class
;
1099 struct ata_taskfile tf
;
1100 unsigned int err_mask
= 0;
1105 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1107 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1109 id
= kmalloc(sizeof(id
[0]) * ATA_ID_WORDS
, GFP_KERNEL
);
1112 reason
= "out of memory";
1117 ata_tf_init(ap
, &tf
, dev
->devno
);
1121 tf
.command
= ATA_CMD_ID_ATA
;
1124 tf
.command
= ATA_CMD_ID_ATAPI
;
1128 reason
= "unsupported class";
1132 tf
.protocol
= ATA_PROT_PIO
;
1134 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1135 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1138 reason
= "I/O error";
1142 swap_buf_le16(id
, ATA_ID_WORDS
);
1145 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1147 reason
= "device reports illegal type";
1151 if (post_reset
&& class == ATA_DEV_ATA
) {
1153 * The exact sequence expected by certain pre-ATA4 drives is:
1156 * INITIALIZE DEVICE PARAMETERS
1158 * Some drives were very specific about that exact sequence.
1160 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1161 err_mask
= ata_dev_init_params(ap
, dev
, id
[3], id
[6]);
1164 reason
= "INIT_DEV_PARAMS failed";
1168 /* current CHS translation info (id[53-58]) might be
1169 * changed. reread the identify device info.
1181 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1182 ap
->id
, dev
->devno
, reason
);
1187 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1188 struct ata_device
*dev
)
1190 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1194 * ata_dev_configure - Configure the specified ATA/ATAPI device
1195 * @ap: Port on which target device resides
1196 * @dev: Target device to configure
1197 * @print_info: Enable device info printout
1199 * Configure @dev according to @dev->id. Generic and low-level
1200 * driver specific fixups are also applied.
1203 * Kernel thread context (may sleep)
1206 * 0 on success, -errno otherwise
1208 static int ata_dev_configure(struct ata_port
*ap
, struct ata_device
*dev
,
1211 const u16
*id
= dev
->id
;
1212 unsigned int xfer_mask
;
1215 if (!ata_dev_present(dev
)) {
1216 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1217 ap
->id
, dev
->devno
);
1221 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1223 /* print device capabilities */
1225 printk(KERN_DEBUG
"ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1226 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1227 ap
->id
, dev
->devno
, id
[49], id
[82], id
[83],
1228 id
[84], id
[85], id
[86], id
[87], id
[88]);
1230 /* initialize to-be-configured parameters */
1232 dev
->max_sectors
= 0;
1240 * common ATA, ATAPI feature tests
1243 /* find max transfer mode; for printk only */
1244 xfer_mask
= ata_id_xfermask(id
);
1248 /* ATA-specific feature tests */
1249 if (dev
->class == ATA_DEV_ATA
) {
1250 dev
->n_sectors
= ata_id_n_sectors(id
);
1252 if (ata_id_has_lba(id
)) {
1253 const char *lba_desc
;
1256 dev
->flags
|= ATA_DFLAG_LBA
;
1257 if (ata_id_has_lba48(id
)) {
1258 dev
->flags
|= ATA_DFLAG_LBA48
;
1262 /* print device info to dmesg */
1264 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1265 "max %s, %Lu sectors: %s\n",
1267 ata_id_major_version(id
),
1268 ata_mode_string(xfer_mask
),
1269 (unsigned long long)dev
->n_sectors
,
1274 /* Default translation */
1275 dev
->cylinders
= id
[1];
1277 dev
->sectors
= id
[6];
1279 if (ata_id_current_chs_valid(id
)) {
1280 /* Current CHS translation is valid. */
1281 dev
->cylinders
= id
[54];
1282 dev
->heads
= id
[55];
1283 dev
->sectors
= id
[56];
1286 /* print device info to dmesg */
1288 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1289 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1291 ata_id_major_version(id
),
1292 ata_mode_string(xfer_mask
),
1293 (unsigned long long)dev
->n_sectors
,
1294 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1297 if (dev
->id
[59] & 0x100) {
1298 dev
->multi_count
= dev
->id
[59] & 0xff;
1299 DPRINTK("ata%u: dev %u multi count %u\n",
1300 ap
->id
, dev
->devno
, dev
->multi_count
);
1306 /* ATAPI-specific feature tests */
1307 else if (dev
->class == ATA_DEV_ATAPI
) {
1308 char *cdb_intr_string
= "";
1310 rc
= atapi_cdb_len(id
);
1311 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1312 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1316 dev
->cdb_len
= (unsigned int) rc
;
1318 if (ata_id_cdb_intr(dev
->id
)) {
1319 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1320 cdb_intr_string
= ", CDB intr";
1323 /* print device info to dmesg */
1325 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s%s\n",
1326 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
),
1330 ap
->host
->max_cmd_len
= 0;
1331 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1332 ap
->host
->max_cmd_len
= max_t(unsigned int,
1333 ap
->host
->max_cmd_len
,
1334 ap
->device
[i
].cdb_len
);
1336 /* limit bridge transfers to udma5, 200 sectors */
1337 if (ata_dev_knobble(ap
, dev
)) {
1339 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1340 ap
->id
, dev
->devno
);
1341 dev
->udma_mask
&= ATA_UDMA5
;
1342 dev
->max_sectors
= ATA_MAX_SECTORS
;
1345 if (ap
->ops
->dev_config
)
1346 ap
->ops
->dev_config(ap
, dev
);
1348 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1352 DPRINTK("EXIT, err\n");
1357 * ata_bus_probe - Reset and probe ATA bus
1360 * Master ATA bus probing function. Initiates a hardware-dependent
1361 * bus reset, then attempts to identify any devices found on
1365 * PCI/etc. bus probe sem.
1368 * Zero on success, non-zero on error.
1371 static int ata_bus_probe(struct ata_port
*ap
)
1373 unsigned int classes
[ATA_MAX_DEVICES
];
1374 unsigned int i
, rc
, found
= 0;
1378 /* reset and determine device classes */
1379 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1380 classes
[i
] = ATA_DEV_UNKNOWN
;
1382 if (ap
->ops
->probe_reset
) {
1383 rc
= ap
->ops
->probe_reset(ap
, classes
);
1385 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1389 ap
->ops
->phy_reset(ap
);
1391 if (!(ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1392 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1393 classes
[i
] = ap
->device
[i
].class;
1398 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1399 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1400 classes
[i
] = ATA_DEV_NONE
;
1402 /* read IDENTIFY page and configure devices */
1403 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1404 struct ata_device
*dev
= &ap
->device
[i
];
1406 dev
->class = classes
[i
];
1408 if (!ata_dev_present(dev
))
1411 WARN_ON(dev
->id
!= NULL
);
1412 if (ata_dev_read_id(ap
, dev
, &dev
->class, 1, &dev
->id
)) {
1413 dev
->class = ATA_DEV_NONE
;
1417 if (ata_dev_configure(ap
, dev
, 1)) {
1418 ata_dev_disable(ap
, dev
);
1426 goto err_out_disable
;
1428 if (ap
->ops
->set_mode
)
1429 ap
->ops
->set_mode(ap
);
1433 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1434 goto err_out_disable
;
1439 ap
->ops
->port_disable(ap
);
1444 * ata_port_probe - Mark port as enabled
1445 * @ap: Port for which we indicate enablement
1447 * Modify @ap data structure such that the system
1448 * thinks that the entire port is enabled.
1450 * LOCKING: host_set lock, or some other form of
1454 void ata_port_probe(struct ata_port
*ap
)
1456 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1460 * sata_print_link_status - Print SATA link status
1461 * @ap: SATA port to printk link status about
1463 * This function prints link speed and status of a SATA link.
1468 static void sata_print_link_status(struct ata_port
*ap
)
1473 if (!ap
->ops
->scr_read
)
1476 sstatus
= scr_read(ap
, SCR_STATUS
);
1478 if (sata_dev_present(ap
)) {
1479 tmp
= (sstatus
>> 4) & 0xf;
1482 else if (tmp
& (1 << 1))
1485 speed
= "<unknown>";
1486 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1487 ap
->id
, speed
, sstatus
);
1489 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1495 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1496 * @ap: SATA port associated with target SATA PHY.
1498 * This function issues commands to standard SATA Sxxx
1499 * PHY registers, to wake up the phy (and device), and
1500 * clear any reset condition.
1503 * PCI/etc. bus probe sem.
1506 void __sata_phy_reset(struct ata_port
*ap
)
1509 unsigned long timeout
= jiffies
+ (HZ
* 5);
1511 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1512 /* issue phy wake/reset */
1513 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1514 /* Couldn't find anything in SATA I/II specs, but
1515 * AHCI-1.1 10.4.2 says at least 1 ms. */
1518 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1520 /* wait for phy to become ready, if necessary */
1523 sstatus
= scr_read(ap
, SCR_STATUS
);
1524 if ((sstatus
& 0xf) != 1)
1526 } while (time_before(jiffies
, timeout
));
1528 /* print link status */
1529 sata_print_link_status(ap
);
1531 /* TODO: phy layer with polling, timeouts, etc. */
1532 if (sata_dev_present(ap
))
1535 ata_port_disable(ap
);
1537 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1540 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1541 ata_port_disable(ap
);
1545 ap
->cbl
= ATA_CBL_SATA
;
1549 * sata_phy_reset - Reset SATA bus.
1550 * @ap: SATA port associated with target SATA PHY.
1552 * This function resets the SATA bus, and then probes
1553 * the bus for devices.
1556 * PCI/etc. bus probe sem.
1559 void sata_phy_reset(struct ata_port
*ap
)
1561 __sata_phy_reset(ap
);
1562 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1568 * ata_dev_pair - return other device on cable
1572 * Obtain the other device on the same cable, or if none is
1573 * present NULL is returned
1576 struct ata_device
*ata_dev_pair(struct ata_port
*ap
, struct ata_device
*adev
)
1578 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1579 if (!ata_dev_present(pair
))
1585 * ata_port_disable - Disable port.
1586 * @ap: Port to be disabled.
1588 * Modify @ap data structure such that the system
1589 * thinks that the entire port is disabled, and should
1590 * never attempt to probe or communicate with devices
1593 * LOCKING: host_set lock, or some other form of
1597 void ata_port_disable(struct ata_port
*ap
)
1599 ap
->device
[0].class = ATA_DEV_NONE
;
1600 ap
->device
[1].class = ATA_DEV_NONE
;
1601 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1605 * This mode timing computation functionality is ported over from
1606 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1609 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1610 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1611 * for PIO 5, which is a nonstandard extension and UDMA6, which
1612 * is currently supported only by Maxtor drives.
1615 static const struct ata_timing ata_timing
[] = {
1617 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1618 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1619 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1620 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1622 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1623 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1624 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1626 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1628 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1629 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1630 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1632 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1633 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1634 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1636 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1637 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1638 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1640 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1641 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1642 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1644 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1649 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1650 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1652 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1654 q
->setup
= EZ(t
->setup
* 1000, T
);
1655 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1656 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1657 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1658 q
->active
= EZ(t
->active
* 1000, T
);
1659 q
->recover
= EZ(t
->recover
* 1000, T
);
1660 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1661 q
->udma
= EZ(t
->udma
* 1000, UT
);
1664 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1665 struct ata_timing
*m
, unsigned int what
)
1667 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1668 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1669 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1670 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1671 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1672 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1673 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1674 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1677 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1679 const struct ata_timing
*t
;
1681 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1682 if (t
->mode
== 0xFF)
1687 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1688 struct ata_timing
*t
, int T
, int UT
)
1690 const struct ata_timing
*s
;
1691 struct ata_timing p
;
1697 if (!(s
= ata_timing_find_mode(speed
)))
1700 memcpy(t
, s
, sizeof(*s
));
1703 * If the drive is an EIDE drive, it can tell us it needs extended
1704 * PIO/MW_DMA cycle timing.
1707 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1708 memset(&p
, 0, sizeof(p
));
1709 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1710 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1711 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1712 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1713 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1715 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1719 * Convert the timing to bus clock counts.
1722 ata_timing_quantize(t
, t
, T
, UT
);
1725 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1726 * S.M.A.R.T * and some other commands. We have to ensure that the
1727 * DMA cycle timing is slower/equal than the fastest PIO timing.
1730 if (speed
> XFER_PIO_4
) {
1731 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1732 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1736 * Lengthen active & recovery time so that cycle time is correct.
1739 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1740 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1741 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1744 if (t
->active
+ t
->recover
< t
->cycle
) {
1745 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1746 t
->recover
= t
->cycle
- t
->active
;
1752 static int ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1754 unsigned int err_mask
;
1757 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1758 dev
->flags
|= ATA_DFLAG_PIO
;
1760 err_mask
= ata_dev_set_xfermode(ap
, dev
);
1763 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1768 rc
= ata_dev_revalidate(ap
, dev
, 0);
1771 "ata%u: failed to revalidate after set xfermode\n",
1776 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1777 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1779 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1781 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1785 static int ata_host_set_pio(struct ata_port
*ap
)
1789 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1790 struct ata_device
*dev
= &ap
->device
[i
];
1792 if (!ata_dev_present(dev
))
1795 if (!dev
->pio_mode
) {
1796 printk(KERN_WARNING
"ata%u: no PIO support for device %d.\n", ap
->id
, i
);
1800 dev
->xfer_mode
= dev
->pio_mode
;
1801 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1802 if (ap
->ops
->set_piomode
)
1803 ap
->ops
->set_piomode(ap
, dev
);
1809 static void ata_host_set_dma(struct ata_port
*ap
)
1813 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1814 struct ata_device
*dev
= &ap
->device
[i
];
1816 if (!ata_dev_present(dev
) || !dev
->dma_mode
)
1819 dev
->xfer_mode
= dev
->dma_mode
;
1820 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
1821 if (ap
->ops
->set_dmamode
)
1822 ap
->ops
->set_dmamode(ap
, dev
);
1827 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1828 * @ap: port on which timings will be programmed
1830 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1833 * PCI/etc. bus probe sem.
1835 static void ata_set_mode(struct ata_port
*ap
)
1837 int i
, rc
, used_dma
= 0;
1839 /* step 1: calculate xfer_mask */
1840 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1841 struct ata_device
*dev
= &ap
->device
[i
];
1842 unsigned int pio_mask
, dma_mask
;
1844 if (!ata_dev_present(dev
))
1847 ata_dev_xfermask(ap
, dev
);
1849 /* TODO: let LLDD filter dev->*_mask here */
1851 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
1852 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
1853 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
1854 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
1860 /* step 2: always set host PIO timings */
1861 rc
= ata_host_set_pio(ap
);
1865 /* step 3: set host DMA timings */
1866 ata_host_set_dma(ap
);
1868 /* step 4: update devices' xfer mode */
1869 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1870 struct ata_device
*dev
= &ap
->device
[i
];
1872 if (!ata_dev_present(dev
))
1875 if (ata_dev_set_mode(ap
, dev
))
1880 * Record simplex status. If we selected DMA then the other
1881 * host channels are not permitted to do so.
1884 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
1885 ap
->host_set
->simplex_claimed
= 1;
1888 * Chip specific finalisation
1890 if (ap
->ops
->post_set_mode
)
1891 ap
->ops
->post_set_mode(ap
);
1896 ata_port_disable(ap
);
1900 * ata_tf_to_host - issue ATA taskfile to host controller
1901 * @ap: port to which command is being issued
1902 * @tf: ATA taskfile register set
1904 * Issues ATA taskfile register set to ATA host controller,
1905 * with proper synchronization with interrupt handler and
1909 * spin_lock_irqsave(host_set lock)
1912 static inline void ata_tf_to_host(struct ata_port
*ap
,
1913 const struct ata_taskfile
*tf
)
1915 ap
->ops
->tf_load(ap
, tf
);
1916 ap
->ops
->exec_command(ap
, tf
);
1920 * ata_busy_sleep - sleep until BSY clears, or timeout
1921 * @ap: port containing status register to be polled
1922 * @tmout_pat: impatience timeout
1923 * @tmout: overall timeout
1925 * Sleep until ATA Status register bit BSY clears,
1926 * or a timeout occurs.
1931 unsigned int ata_busy_sleep (struct ata_port
*ap
,
1932 unsigned long tmout_pat
, unsigned long tmout
)
1934 unsigned long timer_start
, timeout
;
1937 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1938 timer_start
= jiffies
;
1939 timeout
= timer_start
+ tmout_pat
;
1940 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1942 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1945 if (status
& ATA_BUSY
)
1946 printk(KERN_WARNING
"ata%u is slow to respond, "
1947 "please be patient\n", ap
->id
);
1949 timeout
= timer_start
+ tmout
;
1950 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1952 status
= ata_chk_status(ap
);
1955 if (status
& ATA_BUSY
) {
1956 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1957 ap
->id
, tmout
/ HZ
);
1964 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1966 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1967 unsigned int dev0
= devmask
& (1 << 0);
1968 unsigned int dev1
= devmask
& (1 << 1);
1969 unsigned long timeout
;
1971 /* if device 0 was found in ata_devchk, wait for its
1975 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1977 /* if device 1 was found in ata_devchk, wait for
1978 * register access, then wait for BSY to clear
1980 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1984 ap
->ops
->dev_select(ap
, 1);
1985 if (ap
->flags
& ATA_FLAG_MMIO
) {
1986 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1987 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1989 nsect
= inb(ioaddr
->nsect_addr
);
1990 lbal
= inb(ioaddr
->lbal_addr
);
1992 if ((nsect
== 1) && (lbal
== 1))
1994 if (time_after(jiffies
, timeout
)) {
1998 msleep(50); /* give drive a breather */
2001 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2003 /* is all this really necessary? */
2004 ap
->ops
->dev_select(ap
, 0);
2006 ap
->ops
->dev_select(ap
, 1);
2008 ap
->ops
->dev_select(ap
, 0);
2011 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2012 unsigned int devmask
)
2014 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2016 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2018 /* software reset. causes dev0 to be selected */
2019 if (ap
->flags
& ATA_FLAG_MMIO
) {
2020 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2021 udelay(20); /* FIXME: flush */
2022 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2023 udelay(20); /* FIXME: flush */
2024 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2026 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2028 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2030 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2033 /* spec mandates ">= 2ms" before checking status.
2034 * We wait 150ms, because that was the magic delay used for
2035 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2036 * between when the ATA command register is written, and then
2037 * status is checked. Because waiting for "a while" before
2038 * checking status is fine, post SRST, we perform this magic
2039 * delay here as well.
2041 * Old drivers/ide uses the 2mS rule and then waits for ready
2045 /* Before we perform post reset processing we want to see if
2046 * the bus shows 0xFF because the odd clown forgets the D7
2047 * pulldown resistor.
2049 if (ata_check_status(ap
) == 0xFF)
2050 return AC_ERR_OTHER
;
2052 ata_bus_post_reset(ap
, devmask
);
2058 * ata_bus_reset - reset host port and associated ATA channel
2059 * @ap: port to reset
2061 * This is typically the first time we actually start issuing
2062 * commands to the ATA channel. We wait for BSY to clear, then
2063 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2064 * result. Determine what devices, if any, are on the channel
2065 * by looking at the device 0/1 error register. Look at the signature
2066 * stored in each device's taskfile registers, to determine if
2067 * the device is ATA or ATAPI.
2070 * PCI/etc. bus probe sem.
2071 * Obtains host_set lock.
2074 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2077 void ata_bus_reset(struct ata_port
*ap
)
2079 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2080 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2082 unsigned int dev0
, dev1
= 0, devmask
= 0;
2084 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2086 /* determine if device 0/1 are present */
2087 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2090 dev0
= ata_devchk(ap
, 0);
2092 dev1
= ata_devchk(ap
, 1);
2096 devmask
|= (1 << 0);
2098 devmask
|= (1 << 1);
2100 /* select device 0 again */
2101 ap
->ops
->dev_select(ap
, 0);
2103 /* issue bus reset */
2104 if (ap
->flags
& ATA_FLAG_SRST
)
2105 if (ata_bus_softreset(ap
, devmask
))
2109 * determine by signature whether we have ATA or ATAPI devices
2111 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2112 if ((slave_possible
) && (err
!= 0x81))
2113 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2115 /* re-enable interrupts */
2116 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2119 /* is double-select really necessary? */
2120 if (ap
->device
[1].class != ATA_DEV_NONE
)
2121 ap
->ops
->dev_select(ap
, 1);
2122 if (ap
->device
[0].class != ATA_DEV_NONE
)
2123 ap
->ops
->dev_select(ap
, 0);
2125 /* if no devices were detected, disable this port */
2126 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2127 (ap
->device
[1].class == ATA_DEV_NONE
))
2130 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2131 /* set up device control for ATA_FLAG_SATA_RESET */
2132 if (ap
->flags
& ATA_FLAG_MMIO
)
2133 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2135 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2142 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2143 ap
->ops
->port_disable(ap
);
2148 static int sata_phy_resume(struct ata_port
*ap
)
2150 unsigned long timeout
= jiffies
+ (HZ
* 5);
2153 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
2155 /* Wait for phy to become ready, if necessary. */
2158 sstatus
= scr_read(ap
, SCR_STATUS
);
2159 if ((sstatus
& 0xf) != 1)
2161 } while (time_before(jiffies
, timeout
));
2167 * ata_std_probeinit - initialize probing
2168 * @ap: port to be probed
2170 * @ap is about to be probed. Initialize it. This function is
2171 * to be used as standard callback for ata_drive_probe_reset().
2173 * NOTE!!! Do not use this function as probeinit if a low level
2174 * driver implements only hardreset. Just pass NULL as probeinit
2175 * in that case. Using this function is probably okay but doing
2176 * so makes reset sequence different from the original
2177 * ->phy_reset implementation and Jeff nervous. :-P
2179 void ata_std_probeinit(struct ata_port
*ap
)
2181 if ((ap
->flags
& ATA_FLAG_SATA
) && ap
->ops
->scr_read
) {
2182 sata_phy_resume(ap
);
2183 if (sata_dev_present(ap
))
2184 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2189 * ata_std_softreset - reset host port via ATA SRST
2190 * @ap: port to reset
2191 * @verbose: fail verbosely
2192 * @classes: resulting classes of attached devices
2194 * Reset host port using ATA SRST. This function is to be used
2195 * as standard callback for ata_drive_*_reset() functions.
2198 * Kernel thread context (may sleep)
2201 * 0 on success, -errno otherwise.
2203 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2205 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2206 unsigned int devmask
= 0, err_mask
;
2211 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2212 classes
[0] = ATA_DEV_NONE
;
2216 /* determine if device 0/1 are present */
2217 if (ata_devchk(ap
, 0))
2218 devmask
|= (1 << 0);
2219 if (slave_possible
&& ata_devchk(ap
, 1))
2220 devmask
|= (1 << 1);
2222 /* select device 0 again */
2223 ap
->ops
->dev_select(ap
, 0);
2225 /* issue bus reset */
2226 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2227 err_mask
= ata_bus_softreset(ap
, devmask
);
2230 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2233 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2238 /* determine by signature whether we have ATA or ATAPI devices */
2239 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2240 if (slave_possible
&& err
!= 0x81)
2241 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2244 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2249 * sata_std_hardreset - reset host port via SATA phy reset
2250 * @ap: port to reset
2251 * @verbose: fail verbosely
2252 * @class: resulting class of attached device
2254 * SATA phy-reset host port using DET bits of SControl register.
2255 * This function is to be used as standard callback for
2256 * ata_drive_*_reset().
2259 * Kernel thread context (may sleep)
2262 * 0 on success, -errno otherwise.
2264 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2268 /* Issue phy wake/reset */
2269 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2272 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2273 * 10.4.2 says at least 1 ms.
2277 /* Bring phy back */
2278 sata_phy_resume(ap
);
2280 /* TODO: phy layer with polling, timeouts, etc. */
2281 if (!sata_dev_present(ap
)) {
2282 *class = ATA_DEV_NONE
;
2283 DPRINTK("EXIT, link offline\n");
2287 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2289 printk(KERN_ERR
"ata%u: COMRESET failed "
2290 "(device not ready)\n", ap
->id
);
2292 DPRINTK("EXIT, device not ready\n");
2296 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2298 *class = ata_dev_try_classify(ap
, 0, NULL
);
2300 DPRINTK("EXIT, class=%u\n", *class);
2305 * ata_std_postreset - standard postreset callback
2306 * @ap: the target ata_port
2307 * @classes: classes of attached devices
2309 * This function is invoked after a successful reset. Note that
2310 * the device might have been reset more than once using
2311 * different reset methods before postreset is invoked.
2313 * This function is to be used as standard callback for
2314 * ata_drive_*_reset().
2317 * Kernel thread context (may sleep)
2319 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2323 /* set cable type if it isn't already set */
2324 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2325 ap
->cbl
= ATA_CBL_SATA
;
2327 /* print link status */
2328 if (ap
->cbl
== ATA_CBL_SATA
)
2329 sata_print_link_status(ap
);
2331 /* re-enable interrupts */
2332 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2335 /* is double-select really necessary? */
2336 if (classes
[0] != ATA_DEV_NONE
)
2337 ap
->ops
->dev_select(ap
, 1);
2338 if (classes
[1] != ATA_DEV_NONE
)
2339 ap
->ops
->dev_select(ap
, 0);
2341 /* bail out if no device is present */
2342 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2343 DPRINTK("EXIT, no device\n");
2347 /* set up device control */
2348 if (ap
->ioaddr
.ctl_addr
) {
2349 if (ap
->flags
& ATA_FLAG_MMIO
)
2350 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2352 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2359 * ata_std_probe_reset - standard probe reset method
2360 * @ap: prot to perform probe-reset
2361 * @classes: resulting classes of attached devices
2363 * The stock off-the-shelf ->probe_reset method.
2366 * Kernel thread context (may sleep)
2369 * 0 on success, -errno otherwise.
2371 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2373 ata_reset_fn_t hardreset
;
2376 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2377 hardreset
= sata_std_hardreset
;
2379 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2380 ata_std_softreset
, hardreset
,
2381 ata_std_postreset
, classes
);
2384 static int do_probe_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2385 ata_postreset_fn_t postreset
,
2386 unsigned int *classes
)
2390 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2391 classes
[i
] = ATA_DEV_UNKNOWN
;
2393 rc
= reset(ap
, 0, classes
);
2397 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2398 * is complete and convert all ATA_DEV_UNKNOWN to
2401 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2402 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2405 if (i
< ATA_MAX_DEVICES
)
2406 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2407 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2408 classes
[i
] = ATA_DEV_NONE
;
2411 postreset(ap
, classes
);
2413 return classes
[0] != ATA_DEV_UNKNOWN
? 0 : -ENODEV
;
2417 * ata_drive_probe_reset - Perform probe reset with given methods
2418 * @ap: port to reset
2419 * @probeinit: probeinit method (can be NULL)
2420 * @softreset: softreset method (can be NULL)
2421 * @hardreset: hardreset method (can be NULL)
2422 * @postreset: postreset method (can be NULL)
2423 * @classes: resulting classes of attached devices
2425 * Reset the specified port and classify attached devices using
2426 * given methods. This function prefers softreset but tries all
2427 * possible reset sequences to reset and classify devices. This
2428 * function is intended to be used for constructing ->probe_reset
2429 * callback by low level drivers.
2431 * Reset methods should follow the following rules.
2433 * - Return 0 on sucess, -errno on failure.
2434 * - If classification is supported, fill classes[] with
2435 * recognized class codes.
2436 * - If classification is not supported, leave classes[] alone.
2437 * - If verbose is non-zero, print error message on failure;
2438 * otherwise, shut up.
2441 * Kernel thread context (may sleep)
2444 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2445 * if classification fails, and any error code from reset
2448 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2449 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2450 ata_postreset_fn_t postreset
, unsigned int *classes
)
2458 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2466 rc
= do_probe_reset(ap
, hardreset
, postreset
, classes
);
2467 if (rc
== 0 || rc
!= -ENODEV
)
2471 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2477 * ata_dev_same_device - Determine whether new ID matches configured device
2478 * @ap: port on which the device to compare against resides
2479 * @dev: device to compare against
2480 * @new_class: class of the new device
2481 * @new_id: IDENTIFY page of the new device
2483 * Compare @new_class and @new_id against @dev and determine
2484 * whether @dev is the device indicated by @new_class and
2491 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2493 static int ata_dev_same_device(struct ata_port
*ap
, struct ata_device
*dev
,
2494 unsigned int new_class
, const u16
*new_id
)
2496 const u16
*old_id
= dev
->id
;
2497 unsigned char model
[2][41], serial
[2][21];
2500 if (dev
->class != new_class
) {
2502 "ata%u: dev %u class mismatch %d != %d\n",
2503 ap
->id
, dev
->devno
, dev
->class, new_class
);
2507 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2508 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2509 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2510 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2511 new_n_sectors
= ata_id_n_sectors(new_id
);
2513 if (strcmp(model
[0], model
[1])) {
2515 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2516 ap
->id
, dev
->devno
, model
[0], model
[1]);
2520 if (strcmp(serial
[0], serial
[1])) {
2522 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2523 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2527 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2529 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2530 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2531 (unsigned long long)new_n_sectors
);
2539 * ata_dev_revalidate - Revalidate ATA device
2540 * @ap: port on which the device to revalidate resides
2541 * @dev: device to revalidate
2542 * @post_reset: is this revalidation after reset?
2544 * Re-read IDENTIFY page and make sure @dev is still attached to
2548 * Kernel thread context (may sleep)
2551 * 0 on success, negative errno otherwise
2553 int ata_dev_revalidate(struct ata_port
*ap
, struct ata_device
*dev
,
2560 if (!ata_dev_present(dev
))
2566 /* allocate & read ID data */
2567 rc
= ata_dev_read_id(ap
, dev
, &class, post_reset
, &id
);
2571 /* is the device still there? */
2572 if (!ata_dev_same_device(ap
, dev
, class, id
)) {
2580 /* configure device according to the new ID */
2581 return ata_dev_configure(ap
, dev
, 0);
2584 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2585 ap
->id
, dev
->devno
, rc
);
2590 static const char * const ata_dma_blacklist
[] = {
2591 "WDC AC11000H", NULL
,
2592 "WDC AC22100H", NULL
,
2593 "WDC AC32500H", NULL
,
2594 "WDC AC33100H", NULL
,
2595 "WDC AC31600H", NULL
,
2596 "WDC AC32100H", "24.09P07",
2597 "WDC AC23200L", "21.10N21",
2598 "Compaq CRD-8241B", NULL
,
2603 "SanDisk SDP3B", NULL
,
2604 "SanDisk SDP3B-64", NULL
,
2605 "SANYO CD-ROM CRD", NULL
,
2606 "HITACHI CDR-8", NULL
,
2607 "HITACHI CDR-8335", NULL
,
2608 "HITACHI CDR-8435", NULL
,
2609 "Toshiba CD-ROM XM-6202B", NULL
,
2610 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2612 "E-IDE CD-ROM CR-840", NULL
,
2613 "CD-ROM Drive/F5A", NULL
,
2614 "WPI CDD-820", NULL
,
2615 "SAMSUNG CD-ROM SC-148C", NULL
,
2616 "SAMSUNG CD-ROM SC", NULL
,
2617 "SanDisk SDP3B-64", NULL
,
2618 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2619 "_NEC DV5800A", NULL
,
2620 "SAMSUNG CD-ROM SN-124", "N001"
2623 static int ata_strim(char *s
, size_t len
)
2625 len
= strnlen(s
, len
);
2627 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2628 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2635 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2637 unsigned char model_num
[40];
2638 unsigned char model_rev
[16];
2639 unsigned int nlen
, rlen
;
2642 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2644 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2646 nlen
= ata_strim(model_num
, sizeof(model_num
));
2647 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2649 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2650 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2651 if (ata_dma_blacklist
[i
+1] == NULL
)
2653 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2661 * ata_dev_xfermask - Compute supported xfermask of the given device
2662 * @ap: Port on which the device to compute xfermask for resides
2663 * @dev: Device to compute xfermask for
2665 * Compute supported xfermask of @dev and store it in
2666 * dev->*_mask. This function is responsible for applying all
2667 * known limits including host controller limits, device
2670 * FIXME: The current implementation limits all transfer modes to
2671 * the fastest of the lowested device on the port. This is not
2672 * required on most controllers.
2677 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
)
2679 struct ata_host_set
*hs
= ap
->host_set
;
2680 unsigned long xfer_mask
;
2683 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
, ap
->mwdma_mask
,
2686 /* FIXME: Use port-wide xfermask for now */
2687 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2688 struct ata_device
*d
= &ap
->device
[i
];
2689 if (!ata_dev_present(d
))
2691 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
, d
->mwdma_mask
,
2693 xfer_mask
&= ata_id_xfermask(d
->id
);
2694 if (ata_dma_blacklisted(d
))
2695 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2696 /* Apply cable rule here. Don't apply it early because when
2697 we handle hot plug the cable type can itself change */
2698 if (ap
->cbl
== ATA_CBL_PATA40
)
2699 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2702 if (ata_dma_blacklisted(dev
))
2703 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, "
2704 "disabling DMA\n", ap
->id
, dev
->devno
);
2706 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
2707 if (hs
->simplex_claimed
)
2708 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2710 if (ap
->ops
->mode_filter
)
2711 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
2713 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2718 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2719 * @ap: Port associated with device @dev
2720 * @dev: Device to which command will be sent
2722 * Issue SET FEATURES - XFER MODE command to device @dev
2726 * PCI/etc. bus probe sem.
2729 * 0 on success, AC_ERR_* mask otherwise.
2732 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
2733 struct ata_device
*dev
)
2735 struct ata_taskfile tf
;
2736 unsigned int err_mask
;
2738 /* set up set-features taskfile */
2739 DPRINTK("set features - xfer mode\n");
2741 ata_tf_init(ap
, &tf
, dev
->devno
);
2742 tf
.command
= ATA_CMD_SET_FEATURES
;
2743 tf
.feature
= SETFEATURES_XFER
;
2744 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2745 tf
.protocol
= ATA_PROT_NODATA
;
2746 tf
.nsect
= dev
->xfer_mode
;
2748 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2750 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2755 * ata_dev_init_params - Issue INIT DEV PARAMS command
2756 * @ap: Port associated with device @dev
2757 * @dev: Device to which command will be sent
2760 * Kernel thread context (may sleep)
2763 * 0 on success, AC_ERR_* mask otherwise.
2766 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
2767 struct ata_device
*dev
,
2771 struct ata_taskfile tf
;
2772 unsigned int err_mask
;
2774 /* Number of sectors per track 1-255. Number of heads 1-16 */
2775 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2776 return AC_ERR_INVALID
;
2778 /* set up init dev params taskfile */
2779 DPRINTK("init dev params \n");
2781 ata_tf_init(ap
, &tf
, dev
->devno
);
2782 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2783 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2784 tf
.protocol
= ATA_PROT_NODATA
;
2786 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2788 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2790 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2795 * ata_sg_clean - Unmap DMA memory associated with command
2796 * @qc: Command containing DMA memory to be released
2798 * Unmap all mapped DMA memory associated with this command.
2801 * spin_lock_irqsave(host_set lock)
2804 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2806 struct ata_port
*ap
= qc
->ap
;
2807 struct scatterlist
*sg
= qc
->__sg
;
2808 int dir
= qc
->dma_dir
;
2809 void *pad_buf
= NULL
;
2811 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
2812 WARN_ON(sg
== NULL
);
2814 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2815 WARN_ON(qc
->n_elem
> 1);
2817 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2819 /* if we padded the buffer out to 32-bit bound, and data
2820 * xfer direction is from-device, we must copy from the
2821 * pad buffer back into the supplied buffer
2823 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2824 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2826 if (qc
->flags
& ATA_QCFLAG_SG
) {
2828 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
2829 /* restore last sg */
2830 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2832 struct scatterlist
*psg
= &qc
->pad_sgent
;
2833 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2834 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2835 kunmap_atomic(addr
, KM_IRQ0
);
2839 dma_unmap_single(ap
->dev
,
2840 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2843 sg
->length
+= qc
->pad_len
;
2845 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2846 pad_buf
, qc
->pad_len
);
2849 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2854 * ata_fill_sg - Fill PCI IDE PRD table
2855 * @qc: Metadata associated with taskfile to be transferred
2857 * Fill PCI IDE PRD (scatter-gather) table with segments
2858 * associated with the current disk command.
2861 * spin_lock_irqsave(host_set lock)
2864 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2866 struct ata_port
*ap
= qc
->ap
;
2867 struct scatterlist
*sg
;
2870 WARN_ON(qc
->__sg
== NULL
);
2871 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
2874 ata_for_each_sg(sg
, qc
) {
2878 /* determine if physical DMA addr spans 64K boundary.
2879 * Note h/w doesn't support 64-bit, so we unconditionally
2880 * truncate dma_addr_t to u32.
2882 addr
= (u32
) sg_dma_address(sg
);
2883 sg_len
= sg_dma_len(sg
);
2886 offset
= addr
& 0xffff;
2888 if ((offset
+ sg_len
) > 0x10000)
2889 len
= 0x10000 - offset
;
2891 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2892 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2893 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2902 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2905 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2906 * @qc: Metadata associated with taskfile to check
2908 * Allow low-level driver to filter ATA PACKET commands, returning
2909 * a status indicating whether or not it is OK to use DMA for the
2910 * supplied PACKET command.
2913 * spin_lock_irqsave(host_set lock)
2915 * RETURNS: 0 when ATAPI DMA can be used
2918 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2920 struct ata_port
*ap
= qc
->ap
;
2921 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2923 if (ap
->ops
->check_atapi_dma
)
2924 rc
= ap
->ops
->check_atapi_dma(qc
);
2926 /* We don't support polling DMA.
2927 * Use PIO if the LLDD handles only interrupts in
2928 * the HSM_ST_LAST state and the ATAPI device
2929 * generates CDB interrupts.
2931 if ((ap
->flags
& ATA_FLAG_PIO_POLLING
) &&
2932 (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
2938 * ata_qc_prep - Prepare taskfile for submission
2939 * @qc: Metadata associated with taskfile to be prepared
2941 * Prepare ATA taskfile for submission.
2944 * spin_lock_irqsave(host_set lock)
2946 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2948 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2954 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
2957 * ata_sg_init_one - Associate command with memory buffer
2958 * @qc: Command to be associated
2959 * @buf: Memory buffer
2960 * @buflen: Length of memory buffer, in bytes.
2962 * Initialize the data-related elements of queued_cmd @qc
2963 * to point to a single memory buffer, @buf of byte length @buflen.
2966 * spin_lock_irqsave(host_set lock)
2969 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2971 struct scatterlist
*sg
;
2973 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2975 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2976 qc
->__sg
= &qc
->sgent
;
2978 qc
->orig_n_elem
= 1;
2982 sg_init_one(sg
, buf
, buflen
);
2986 * ata_sg_init - Associate command with scatter-gather table.
2987 * @qc: Command to be associated
2988 * @sg: Scatter-gather table.
2989 * @n_elem: Number of elements in s/g table.
2991 * Initialize the data-related elements of queued_cmd @qc
2992 * to point to a scatter-gather table @sg, containing @n_elem
2996 * spin_lock_irqsave(host_set lock)
2999 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3000 unsigned int n_elem
)
3002 qc
->flags
|= ATA_QCFLAG_SG
;
3004 qc
->n_elem
= n_elem
;
3005 qc
->orig_n_elem
= n_elem
;
3009 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3010 * @qc: Command with memory buffer to be mapped.
3012 * DMA-map the memory buffer associated with queued_cmd @qc.
3015 * spin_lock_irqsave(host_set lock)
3018 * Zero on success, negative on error.
3021 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3023 struct ata_port
*ap
= qc
->ap
;
3024 int dir
= qc
->dma_dir
;
3025 struct scatterlist
*sg
= qc
->__sg
;
3026 dma_addr_t dma_address
;
3029 /* we must lengthen transfers to end on a 32-bit boundary */
3030 qc
->pad_len
= sg
->length
& 3;
3032 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3033 struct scatterlist
*psg
= &qc
->pad_sgent
;
3035 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3037 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3039 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3040 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3043 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3044 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3046 sg
->length
-= qc
->pad_len
;
3047 if (sg
->length
== 0)
3050 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3051 sg
->length
, qc
->pad_len
);
3059 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3061 if (dma_mapping_error(dma_address
)) {
3063 sg
->length
+= qc
->pad_len
;
3067 sg_dma_address(sg
) = dma_address
;
3068 sg_dma_len(sg
) = sg
->length
;
3071 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3072 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3078 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3079 * @qc: Command with scatter-gather table to be mapped.
3081 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3084 * spin_lock_irqsave(host_set lock)
3087 * Zero on success, negative on error.
3091 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3093 struct ata_port
*ap
= qc
->ap
;
3094 struct scatterlist
*sg
= qc
->__sg
;
3095 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3096 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3098 VPRINTK("ENTER, ata%u\n", ap
->id
);
3099 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3101 /* we must lengthen transfers to end on a 32-bit boundary */
3102 qc
->pad_len
= lsg
->length
& 3;
3104 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3105 struct scatterlist
*psg
= &qc
->pad_sgent
;
3106 unsigned int offset
;
3108 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3110 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3113 * psg->page/offset are used to copy to-be-written
3114 * data in this function or read data in ata_sg_clean.
3116 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3117 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3118 psg
->offset
= offset_in_page(offset
);
3120 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3121 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3122 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3123 kunmap_atomic(addr
, KM_IRQ0
);
3126 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3127 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3129 lsg
->length
-= qc
->pad_len
;
3130 if (lsg
->length
== 0)
3133 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3134 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3137 pre_n_elem
= qc
->n_elem
;
3138 if (trim_sg
&& pre_n_elem
)
3147 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3149 /* restore last sg */
3150 lsg
->length
+= qc
->pad_len
;
3154 DPRINTK("%d sg elements mapped\n", n_elem
);
3157 qc
->n_elem
= n_elem
;
3163 * ata_poll_qc_complete - turn irq back on and finish qc
3164 * @qc: Command to complete
3165 * @err_mask: ATA status register content
3168 * None. (grabs host lock)
3171 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3173 struct ata_port
*ap
= qc
->ap
;
3174 unsigned long flags
;
3176 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3178 ata_qc_complete(qc
);
3179 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3183 * swap_buf_le16 - swap halves of 16-bit words in place
3184 * @buf: Buffer to swap
3185 * @buf_words: Number of 16-bit words in buffer.
3187 * Swap halves of 16-bit words if needed to convert from
3188 * little-endian byte order to native cpu byte order, or
3192 * Inherited from caller.
3194 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3199 for (i
= 0; i
< buf_words
; i
++)
3200 buf
[i
] = le16_to_cpu(buf
[i
]);
3201 #endif /* __BIG_ENDIAN */
3205 * ata_mmio_data_xfer - Transfer data by MMIO
3206 * @ap: port to read/write
3208 * @buflen: buffer length
3209 * @write_data: read/write
3211 * Transfer data from/to the device data register by MMIO.
3214 * Inherited from caller.
3217 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3218 unsigned int buflen
, int write_data
)
3221 unsigned int words
= buflen
>> 1;
3222 u16
*buf16
= (u16
*) buf
;
3223 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3225 /* Transfer multiple of 2 bytes */
3227 for (i
= 0; i
< words
; i
++)
3228 writew(le16_to_cpu(buf16
[i
]), mmio
);
3230 for (i
= 0; i
< words
; i
++)
3231 buf16
[i
] = cpu_to_le16(readw(mmio
));
3234 /* Transfer trailing 1 byte, if any. */
3235 if (unlikely(buflen
& 0x01)) {
3236 u16 align_buf
[1] = { 0 };
3237 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3240 memcpy(align_buf
, trailing_buf
, 1);
3241 writew(le16_to_cpu(align_buf
[0]), mmio
);
3243 align_buf
[0] = cpu_to_le16(readw(mmio
));
3244 memcpy(trailing_buf
, align_buf
, 1);
3250 * ata_pio_data_xfer - Transfer data by PIO
3251 * @ap: port to read/write
3253 * @buflen: buffer length
3254 * @write_data: read/write
3256 * Transfer data from/to the device data register by PIO.
3259 * Inherited from caller.
3262 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3263 unsigned int buflen
, int write_data
)
3265 unsigned int words
= buflen
>> 1;
3267 /* Transfer multiple of 2 bytes */
3269 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3271 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3273 /* Transfer trailing 1 byte, if any. */
3274 if (unlikely(buflen
& 0x01)) {
3275 u16 align_buf
[1] = { 0 };
3276 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3279 memcpy(align_buf
, trailing_buf
, 1);
3280 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3282 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3283 memcpy(trailing_buf
, align_buf
, 1);
3289 * ata_data_xfer - Transfer data from/to the data register.
3290 * @ap: port to read/write
3292 * @buflen: buffer length
3293 * @do_write: read/write
3295 * Transfer data from/to the device data register.
3298 * Inherited from caller.
3301 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3302 unsigned int buflen
, int do_write
)
3304 /* Make the crap hardware pay the costs not the good stuff */
3305 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3306 unsigned long flags
;
3307 local_irq_save(flags
);
3308 if (ap
->flags
& ATA_FLAG_MMIO
)
3309 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3311 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3312 local_irq_restore(flags
);
3314 if (ap
->flags
& ATA_FLAG_MMIO
)
3315 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3317 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3322 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3323 * @qc: Command on going
3325 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3328 * Inherited from caller.
3331 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3333 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3334 struct scatterlist
*sg
= qc
->__sg
;
3335 struct ata_port
*ap
= qc
->ap
;
3337 unsigned int offset
;
3340 if (qc
->cursect
== (qc
->nsect
- 1))
3341 ap
->hsm_task_state
= HSM_ST_LAST
;
3343 page
= sg
[qc
->cursg
].page
;
3344 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3346 /* get the current page and offset */
3347 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3348 offset
%= PAGE_SIZE
;
3350 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3352 if (PageHighMem(page
)) {
3353 unsigned long flags
;
3355 local_irq_save(flags
);
3356 buf
= kmap_atomic(page
, KM_IRQ0
);
3358 /* do the actual data transfer */
3359 ata_data_xfer(ap
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3361 kunmap_atomic(buf
, KM_IRQ0
);
3362 local_irq_restore(flags
);
3364 buf
= page_address(page
);
3365 ata_data_xfer(ap
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3371 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3378 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3379 * @qc: Command on going
3381 * Transfer one or many ATA_SECT_SIZE of data from/to the
3382 * ATA device for the DRQ request.
3385 * Inherited from caller.
3388 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3390 if (is_multi_taskfile(&qc
->tf
)) {
3391 /* READ/WRITE MULTIPLE */
3394 WARN_ON(qc
->dev
->multi_count
== 0);
3396 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3404 * atapi_send_cdb - Write CDB bytes to hardware
3405 * @ap: Port to which ATAPI device is attached.
3406 * @qc: Taskfile currently active
3408 * When device has indicated its readiness to accept
3409 * a CDB, this function is called. Send the CDB.
3415 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3418 DPRINTK("send cdb\n");
3419 WARN_ON(qc
->dev
->cdb_len
< 12);
3421 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3422 ata_altstatus(ap
); /* flush */
3424 switch (qc
->tf
.protocol
) {
3425 case ATA_PROT_ATAPI
:
3426 ap
->hsm_task_state
= HSM_ST
;
3428 case ATA_PROT_ATAPI_NODATA
:
3429 ap
->hsm_task_state
= HSM_ST_LAST
;
3431 case ATA_PROT_ATAPI_DMA
:
3432 ap
->hsm_task_state
= HSM_ST_LAST
;
3433 /* initiate bmdma */
3434 ap
->ops
->bmdma_start(qc
);
3440 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3441 * @qc: Command on going
3442 * @bytes: number of bytes
3444 * Transfer Transfer data from/to the ATAPI device.
3447 * Inherited from caller.
3451 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3453 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3454 struct scatterlist
*sg
= qc
->__sg
;
3455 struct ata_port
*ap
= qc
->ap
;
3458 unsigned int offset
, count
;
3460 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3461 ap
->hsm_task_state
= HSM_ST_LAST
;
3464 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3466 * The end of qc->sg is reached and the device expects
3467 * more data to transfer. In order not to overrun qc->sg
3468 * and fulfill length specified in the byte count register,
3469 * - for read case, discard trailing data from the device
3470 * - for write case, padding zero data to the device
3472 u16 pad_buf
[1] = { 0 };
3473 unsigned int words
= bytes
>> 1;
3476 if (words
) /* warning if bytes > 1 */
3477 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3480 for (i
= 0; i
< words
; i
++)
3481 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3483 ap
->hsm_task_state
= HSM_ST_LAST
;
3487 sg
= &qc
->__sg
[qc
->cursg
];
3490 offset
= sg
->offset
+ qc
->cursg_ofs
;
3492 /* get the current page and offset */
3493 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3494 offset
%= PAGE_SIZE
;
3496 /* don't overrun current sg */
3497 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3499 /* don't cross page boundaries */
3500 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3502 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3504 if (PageHighMem(page
)) {
3505 unsigned long flags
;
3507 local_irq_save(flags
);
3508 buf
= kmap_atomic(page
, KM_IRQ0
);
3510 /* do the actual data transfer */
3511 ata_data_xfer(ap
, buf
+ offset
, count
, do_write
);
3513 kunmap_atomic(buf
, KM_IRQ0
);
3514 local_irq_restore(flags
);
3516 buf
= page_address(page
);
3517 ata_data_xfer(ap
, buf
+ offset
, count
, do_write
);
3521 qc
->curbytes
+= count
;
3522 qc
->cursg_ofs
+= count
;
3524 if (qc
->cursg_ofs
== sg
->length
) {
3534 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3535 * @qc: Command on going
3537 * Transfer Transfer data from/to the ATAPI device.
3540 * Inherited from caller.
3543 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3545 struct ata_port
*ap
= qc
->ap
;
3546 struct ata_device
*dev
= qc
->dev
;
3547 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3548 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3550 ap
->ops
->tf_read(ap
, &qc
->tf
);
3551 ireason
= qc
->tf
.nsect
;
3552 bc_lo
= qc
->tf
.lbam
;
3553 bc_hi
= qc
->tf
.lbah
;
3554 bytes
= (bc_hi
<< 8) | bc_lo
;
3556 /* shall be cleared to zero, indicating xfer of data */
3557 if (ireason
& (1 << 0))
3560 /* make sure transfer direction matches expected */
3561 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3562 if (do_write
!= i_write
)
3565 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3567 __atapi_pio_bytes(qc
, bytes
);
3572 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3573 ap
->id
, dev
->devno
);
3574 qc
->err_mask
|= AC_ERR_HSM
;
3575 ap
->hsm_task_state
= HSM_ST_ERR
;
3579 * ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
3580 * @ap: the target ata_port
3584 * 1 if ok in workqueue, 0 otherwise.
3587 static inline int ata_hsm_ok_in_wq(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3589 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
3592 if (ap
->hsm_task_state
== HSM_ST_FIRST
) {
3593 if (qc
->tf
.protocol
== ATA_PROT_PIO
&&
3594 (qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3597 if (is_atapi_taskfile(&qc
->tf
) &&
3598 !(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
3606 * ata_hsm_move - move the HSM to the next state.
3607 * @ap: the target ata_port
3609 * @status: current device status
3610 * @in_wq: 1 if called from workqueue, 0 otherwise
3613 * 1 when poll next status needed, 0 otherwise.
3616 static int ata_hsm_move(struct ata_port
*ap
, struct ata_queued_cmd
*qc
,
3617 u8 status
, int in_wq
)
3619 unsigned long flags
= 0;
3622 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
3624 /* Make sure ata_qc_issue_prot() does not throw things
3625 * like DMA polling into the workqueue. Notice that
3626 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
3628 WARN_ON(in_wq
!= ata_hsm_ok_in_wq(ap
, qc
));
3631 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
3632 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
3634 switch (ap
->hsm_task_state
) {
3636 /* Send first data block or PACKET CDB */
3638 /* If polling, we will stay in the work queue after
3639 * sending the data. Otherwise, interrupt handler
3640 * takes over after sending the data.
3642 poll_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
3644 /* check device status */
3645 if (unlikely((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
)) {
3646 /* Wrong status. Let EH handle this */
3647 qc
->err_mask
|= AC_ERR_HSM
;
3648 ap
->hsm_task_state
= HSM_ST_ERR
;
3652 /* Device should not ask for data transfer (DRQ=1)
3653 * when it finds something wrong.
3654 * Anyway, we respect DRQ here and let HSM go on
3655 * without changing hsm_task_state to HSM_ST_ERR.
3657 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
3658 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
3660 qc
->err_mask
|= AC_ERR_DEV
;
3663 /* Send the CDB (atapi) or the first data block (ata pio out).
3664 * During the state transition, interrupt handler shouldn't
3665 * be invoked before the data transfer is complete and
3666 * hsm_task_state is changed. Hence, the following locking.
3669 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3671 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
3672 /* PIO data out protocol.
3673 * send first data block.
3676 /* ata_pio_sectors() might change the state
3677 * to HSM_ST_LAST. so, the state is changed here
3678 * before ata_pio_sectors().
3680 ap
->hsm_task_state
= HSM_ST
;
3681 ata_pio_sectors(qc
);
3682 ata_altstatus(ap
); /* flush */
3685 atapi_send_cdb(ap
, qc
);
3688 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3690 /* if polling, ata_pio_task() handles the rest.
3691 * otherwise, interrupt handler takes over from here.
3696 /* complete command or read/write the data register */
3697 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
3698 /* ATAPI PIO protocol */
3699 if ((status
& ATA_DRQ
) == 0) {
3700 /* no more data to transfer */
3701 ap
->hsm_task_state
= HSM_ST_LAST
;
3705 /* Device should not ask for data transfer (DRQ=1)
3706 * when it finds something wrong.
3707 * Anyway, we respect DRQ here and let HSM go on
3708 * without changing hsm_task_state to HSM_ST_ERR.
3710 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
3711 printk(KERN_WARNING
"ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
3713 qc
->err_mask
|= AC_ERR_DEV
;
3716 atapi_pio_bytes(qc
);
3718 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
3719 /* bad ireason reported by device */
3723 /* ATA PIO protocol */
3724 if (unlikely((status
& ATA_DRQ
) == 0)) {
3725 /* handle BSY=0, DRQ=0 as error */
3726 qc
->err_mask
|= AC_ERR_HSM
;
3727 ap
->hsm_task_state
= HSM_ST_ERR
;
3731 /* Some devices may ask for data transfer (DRQ=1)
3732 * alone with ERR=1 for PIO reads.
3733 * We respect DRQ here and let HSM go on without
3734 * changing hsm_task_state to HSM_ST_ERR.
3736 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
3737 /* For writes, ERR=1 DRQ=1 doesn't make
3738 * sense since the data block has been
3739 * transferred to the device.
3741 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3743 /* data might be corrputed */
3744 qc
->err_mask
|= AC_ERR_DEV
;
3747 ata_pio_sectors(qc
);
3749 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
3750 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
3753 status
= ata_wait_idle(ap
);
3758 ata_altstatus(ap
); /* flush */
3763 if (unlikely(!ata_ok(status
))) {
3764 qc
->err_mask
|= __ac_err_mask(status
);
3765 ap
->hsm_task_state
= HSM_ST_ERR
;
3769 /* no more data to transfer */
3770 DPRINTK("ata%u: command complete, drv_stat 0x%x\n",
3773 WARN_ON(qc
->err_mask
);
3775 ap
->hsm_task_state
= HSM_ST_IDLE
;
3777 /* complete taskfile transaction */
3779 ata_poll_qc_complete(qc
);
3781 ata_qc_complete(qc
);
3787 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3788 printk(KERN_ERR
"ata%u: command error, drv_stat 0x%x\n",
3791 /* make sure qc->err_mask is available to
3792 * know what's wrong and recover
3794 WARN_ON(qc
->err_mask
== 0);
3796 ap
->hsm_task_state
= HSM_ST_IDLE
;
3798 /* complete taskfile transaction */
3800 ata_poll_qc_complete(qc
);
3802 ata_qc_complete(qc
);
3814 static void ata_pio_task(void *_data
)
3816 struct ata_port
*ap
= _data
;
3817 struct ata_queued_cmd
*qc
;
3822 WARN_ON(ap
->hsm_task_state
== HSM_ST_IDLE
);
3824 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3825 WARN_ON(qc
== NULL
);
3828 * This is purely heuristic. This is a fast path.
3829 * Sometimes when we enter, BSY will be cleared in
3830 * a chk-status or two. If not, the drive is probably seeking
3831 * or something. Snooze for a couple msecs, then
3832 * chk-status again. If still busy, queue delayed work.
3834 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3835 if (status
& ATA_BUSY
) {
3837 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3838 if (status
& ATA_BUSY
) {
3839 ata_port_queue_task(ap
, ata_pio_task
, ap
, ATA_SHORT_PAUSE
);
3845 poll_next
= ata_hsm_move(ap
, qc
, status
, 1);
3847 /* another command or interrupt handler
3848 * may be running at this point.
3855 * ata_qc_timeout - Handle timeout of queued command
3856 * @qc: Command that timed out
3858 * Some part of the kernel (currently, only the SCSI layer)
3859 * has noticed that the active command on port @ap has not
3860 * completed after a specified length of time. Handle this
3861 * condition by disabling DMA (if necessary) and completing
3862 * transactions, with error if necessary.
3864 * This also handles the case of the "lost interrupt", where
3865 * for some reason (possibly hardware bug, possibly driver bug)
3866 * an interrupt was not delivered to the driver, even though the
3867 * transaction completed successfully.
3870 * Inherited from SCSI layer (none, can sleep)
3873 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3875 struct ata_port
*ap
= qc
->ap
;
3876 struct ata_host_set
*host_set
= ap
->host_set
;
3877 u8 host_stat
= 0, drv_stat
;
3878 unsigned long flags
;
3882 ap
->hsm_task_state
= HSM_ST_IDLE
;
3884 spin_lock_irqsave(&host_set
->lock
, flags
);
3886 switch (qc
->tf
.protocol
) {
3889 case ATA_PROT_ATAPI_DMA
:
3890 host_stat
= ap
->ops
->bmdma_status(ap
);
3892 /* before we do anything else, clear DMA-Start bit */
3893 ap
->ops
->bmdma_stop(qc
);
3899 drv_stat
= ata_chk_status(ap
);
3901 /* ack bmdma irq events */
3902 ap
->ops
->irq_clear(ap
);
3904 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3905 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3907 ap
->hsm_task_state
= HSM_ST_IDLE
;
3909 /* complete taskfile transaction */
3910 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3914 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3916 ata_eh_qc_complete(qc
);
3922 * ata_eng_timeout - Handle timeout of queued command
3923 * @ap: Port on which timed-out command is active
3925 * Some part of the kernel (currently, only the SCSI layer)
3926 * has noticed that the active command on port @ap has not
3927 * completed after a specified length of time. Handle this
3928 * condition by disabling DMA (if necessary) and completing
3929 * transactions, with error if necessary.
3931 * This also handles the case of the "lost interrupt", where
3932 * for some reason (possibly hardware bug, possibly driver bug)
3933 * an interrupt was not delivered to the driver, even though the
3934 * transaction completed successfully.
3937 * Inherited from SCSI layer (none, can sleep)
3940 void ata_eng_timeout(struct ata_port
*ap
)
3944 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
3950 * ata_qc_new - Request an available ATA command, for queueing
3951 * @ap: Port associated with device @dev
3952 * @dev: Device from whom we request an available command structure
3958 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3960 struct ata_queued_cmd
*qc
= NULL
;
3963 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3964 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3965 qc
= ata_qc_from_tag(ap
, i
);
3976 * ata_qc_new_init - Request an available ATA command, and initialize it
3977 * @ap: Port associated with device @dev
3978 * @dev: Device from whom we request an available command structure
3984 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3985 struct ata_device
*dev
)
3987 struct ata_queued_cmd
*qc
;
3989 qc
= ata_qc_new(ap
);
4002 * ata_qc_free - free unused ata_queued_cmd
4003 * @qc: Command to complete
4005 * Designed to free unused ata_queued_cmd object
4006 * in case something prevents using it.
4009 * spin_lock_irqsave(host_set lock)
4011 void ata_qc_free(struct ata_queued_cmd
*qc
)
4013 struct ata_port
*ap
= qc
->ap
;
4016 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4020 if (likely(ata_tag_valid(tag
))) {
4021 if (tag
== ap
->active_tag
)
4022 ap
->active_tag
= ATA_TAG_POISON
;
4023 qc
->tag
= ATA_TAG_POISON
;
4024 clear_bit(tag
, &ap
->qactive
);
4028 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4030 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4031 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4033 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4036 /* atapi: mark qc as inactive to prevent the interrupt handler
4037 * from completing the command twice later, before the error handler
4038 * is called. (when rc != 0 and atapi request sense is needed)
4040 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4042 /* call completion callback */
4043 qc
->complete_fn(qc
);
4046 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4048 struct ata_port
*ap
= qc
->ap
;
4050 switch (qc
->tf
.protocol
) {
4052 case ATA_PROT_ATAPI_DMA
:
4055 case ATA_PROT_ATAPI
:
4057 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4070 * ata_qc_issue - issue taskfile to device
4071 * @qc: command to issue to device
4073 * Prepare an ATA command to submission to device.
4074 * This includes mapping the data into a DMA-able
4075 * area, filling in the S/G table, and finally
4076 * writing the taskfile to hardware, starting the command.
4079 * spin_lock_irqsave(host_set lock)
4082 * Zero on success, AC_ERR_* mask on failure
4085 unsigned int ata_qc_issue(struct ata_queued_cmd
*qc
)
4087 struct ata_port
*ap
= qc
->ap
;
4089 if (ata_should_dma_map(qc
)) {
4090 if (qc
->flags
& ATA_QCFLAG_SG
) {
4091 if (ata_sg_setup(qc
))
4093 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4094 if (ata_sg_setup_one(qc
))
4098 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4101 ap
->ops
->qc_prep(qc
);
4103 qc
->ap
->active_tag
= qc
->tag
;
4104 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4106 return ap
->ops
->qc_issue(qc
);
4109 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4110 return AC_ERR_SYSTEM
;
4115 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4116 * @qc: command to issue to device
4118 * Using various libata functions and hooks, this function
4119 * starts an ATA command. ATA commands are grouped into
4120 * classes called "protocols", and issuing each type of protocol
4121 * is slightly different.
4123 * May be used as the qc_issue() entry in ata_port_operations.
4126 * spin_lock_irqsave(host_set lock)
4129 * Zero on success, AC_ERR_* mask on failure
4132 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4134 struct ata_port
*ap
= qc
->ap
;
4136 /* Use polling pio if the LLD doesn't handle
4137 * interrupt driven pio and atapi CDB interrupt.
4139 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4140 switch (qc
->tf
.protocol
) {
4142 case ATA_PROT_ATAPI
:
4143 case ATA_PROT_ATAPI_NODATA
:
4144 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4146 case ATA_PROT_ATAPI_DMA
:
4147 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4148 /* see ata_check_atapi_dma() */
4156 /* select the device */
4157 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4159 /* start the command */
4160 switch (qc
->tf
.protocol
) {
4161 case ATA_PROT_NODATA
:
4162 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4163 ata_qc_set_polling(qc
);
4165 ata_tf_to_host(ap
, &qc
->tf
);
4166 ap
->hsm_task_state
= HSM_ST_LAST
;
4168 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4169 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4174 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4176 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4177 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4178 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4179 ap
->hsm_task_state
= HSM_ST_LAST
;
4183 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4184 ata_qc_set_polling(qc
);
4186 ata_tf_to_host(ap
, &qc
->tf
);
4188 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4189 /* PIO data out protocol */
4190 ap
->hsm_task_state
= HSM_ST_FIRST
;
4191 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4193 /* always send first data block using
4194 * the ata_pio_task() codepath.
4197 /* PIO data in protocol */
4198 ap
->hsm_task_state
= HSM_ST
;
4200 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4201 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4203 /* if polling, ata_pio_task() handles the rest.
4204 * otherwise, interrupt handler takes over from here.
4210 case ATA_PROT_ATAPI
:
4211 case ATA_PROT_ATAPI_NODATA
:
4212 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4213 ata_qc_set_polling(qc
);
4215 ata_tf_to_host(ap
, &qc
->tf
);
4217 ap
->hsm_task_state
= HSM_ST_FIRST
;
4219 /* send cdb by polling if no cdb interrupt */
4220 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4221 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4222 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4225 case ATA_PROT_ATAPI_DMA
:
4226 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4228 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4229 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4230 ap
->hsm_task_state
= HSM_ST_FIRST
;
4232 /* send cdb by polling if no cdb interrupt */
4233 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4234 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4239 return AC_ERR_SYSTEM
;
4246 * ata_host_intr - Handle host interrupt for given (port, task)
4247 * @ap: Port on which interrupt arrived (possibly...)
4248 * @qc: Taskfile currently active in engine
4250 * Handle host interrupt for given queued command. Currently,
4251 * only DMA interrupts are handled. All other commands are
4252 * handled via polling with interrupts disabled (nIEN bit).
4255 * spin_lock_irqsave(host_set lock)
4258 * One if interrupt was handled, zero if not (shared irq).
4261 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4262 struct ata_queued_cmd
*qc
)
4264 u8 status
, host_stat
= 0;
4266 VPRINTK("ata%u: protocol %d task_state %d\n",
4267 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4269 /* Check whether we are expecting interrupt in this state */
4270 switch (ap
->hsm_task_state
) {
4272 /* Some pre-ATAPI-4 devices assert INTRQ
4273 * at this state when ready to receive CDB.
4276 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4277 * The flag was turned on only for atapi devices.
4278 * No need to check is_atapi_taskfile(&qc->tf) again.
4280 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4284 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4285 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4286 /* check status of DMA engine */
4287 host_stat
= ap
->ops
->bmdma_status(ap
);
4288 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4290 /* if it's not our irq... */
4291 if (!(host_stat
& ATA_DMA_INTR
))
4294 /* before we do anything else, clear DMA-Start bit */
4295 ap
->ops
->bmdma_stop(qc
);
4297 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4298 /* error when transfering data to/from memory */
4299 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4300 ap
->hsm_task_state
= HSM_ST_ERR
;
4310 /* check altstatus */
4311 status
= ata_altstatus(ap
);
4312 if (status
& ATA_BUSY
)
4315 /* check main status, clearing INTRQ */
4316 status
= ata_chk_status(ap
);
4317 if (unlikely(status
& ATA_BUSY
))
4320 /* ack bmdma irq events */
4321 ap
->ops
->irq_clear(ap
);
4323 ata_hsm_move(ap
, qc
, status
, 0);
4324 return 1; /* irq handled */
4327 ap
->stats
.idle_irq
++;
4330 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4331 ata_irq_ack(ap
, 0); /* debug trap */
4332 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4336 return 0; /* irq not handled */
4340 * ata_interrupt - Default ATA host interrupt handler
4341 * @irq: irq line (unused)
4342 * @dev_instance: pointer to our ata_host_set information structure
4345 * Default interrupt handler for PCI IDE devices. Calls
4346 * ata_host_intr() for each port that is not disabled.
4349 * Obtains host_set lock during operation.
4352 * IRQ_NONE or IRQ_HANDLED.
4355 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4357 struct ata_host_set
*host_set
= dev_instance
;
4359 unsigned int handled
= 0;
4360 unsigned long flags
;
4362 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4363 spin_lock_irqsave(&host_set
->lock
, flags
);
4365 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4366 struct ata_port
*ap
;
4368 ap
= host_set
->ports
[i
];
4370 !(ap
->flags
& ATA_FLAG_PORT_DISABLED
)) {
4371 struct ata_queued_cmd
*qc
;
4373 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4374 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4375 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4376 handled
|= ata_host_intr(ap
, qc
);
4380 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4382 return IRQ_RETVAL(handled
);
4387 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4388 * without filling any other registers
4390 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4393 struct ata_taskfile tf
;
4396 ata_tf_init(ap
, &tf
, dev
->devno
);
4399 tf
.flags
|= ATA_TFLAG_DEVICE
;
4400 tf
.protocol
= ATA_PROT_NODATA
;
4402 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4404 printk(KERN_ERR
"%s: ata command failed: %d\n",
4410 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4414 if (!ata_try_flush_cache(dev
))
4417 if (ata_id_has_flush_ext(dev
->id
))
4418 cmd
= ATA_CMD_FLUSH_EXT
;
4420 cmd
= ATA_CMD_FLUSH
;
4422 return ata_do_simple_cmd(ap
, dev
, cmd
);
4425 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4427 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4430 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4432 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4436 * ata_device_resume - wakeup a previously suspended devices
4437 * @ap: port the device is connected to
4438 * @dev: the device to resume
4440 * Kick the drive back into action, by sending it an idle immediate
4441 * command and making sure its transfer mode matches between drive
4445 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4447 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4448 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4451 if (!ata_dev_present(dev
))
4453 if (dev
->class == ATA_DEV_ATA
)
4454 ata_start_drive(ap
, dev
);
4460 * ata_device_suspend - prepare a device for suspend
4461 * @ap: port the device is connected to
4462 * @dev: the device to suspend
4464 * Flush the cache on the drive, if appropriate, then issue a
4465 * standbynow command.
4467 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
, pm_message_t state
)
4469 if (!ata_dev_present(dev
))
4471 if (dev
->class == ATA_DEV_ATA
)
4472 ata_flush_cache(ap
, dev
);
4474 if (state
.event
!= PM_EVENT_FREEZE
)
4475 ata_standby_drive(ap
, dev
);
4476 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4481 * ata_port_start - Set port up for dma.
4482 * @ap: Port to initialize
4484 * Called just after data structures for each port are
4485 * initialized. Allocates space for PRD table.
4487 * May be used as the port_start() entry in ata_port_operations.
4490 * Inherited from caller.
4493 int ata_port_start (struct ata_port
*ap
)
4495 struct device
*dev
= ap
->dev
;
4498 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4502 rc
= ata_pad_alloc(ap
, dev
);
4504 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4508 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4515 * ata_port_stop - Undo ata_port_start()
4516 * @ap: Port to shut down
4518 * Frees the PRD table.
4520 * May be used as the port_stop() entry in ata_port_operations.
4523 * Inherited from caller.
4526 void ata_port_stop (struct ata_port
*ap
)
4528 struct device
*dev
= ap
->dev
;
4530 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4531 ata_pad_free(ap
, dev
);
4534 void ata_host_stop (struct ata_host_set
*host_set
)
4536 if (host_set
->mmio_base
)
4537 iounmap(host_set
->mmio_base
);
4542 * ata_host_remove - Unregister SCSI host structure with upper layers
4543 * @ap: Port to unregister
4544 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4547 * Inherited from caller.
4550 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4552 struct Scsi_Host
*sh
= ap
->host
;
4557 scsi_remove_host(sh
);
4559 ap
->ops
->port_stop(ap
);
4563 * ata_host_init - Initialize an ata_port structure
4564 * @ap: Structure to initialize
4565 * @host: associated SCSI mid-layer structure
4566 * @host_set: Collection of hosts to which @ap belongs
4567 * @ent: Probe information provided by low-level driver
4568 * @port_no: Port number associated with this ata_port
4570 * Initialize a new ata_port structure, and its associated
4574 * Inherited from caller.
4577 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4578 struct ata_host_set
*host_set
,
4579 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4585 host
->max_channel
= 1;
4586 host
->unique_id
= ata_unique_id
++;
4587 host
->max_cmd_len
= 12;
4589 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4590 ap
->id
= host
->unique_id
;
4592 ap
->ctl
= ATA_DEVCTL_OBS
;
4593 ap
->host_set
= host_set
;
4595 ap
->port_no
= port_no
;
4597 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4598 ap
->pio_mask
= ent
->pio_mask
;
4599 ap
->mwdma_mask
= ent
->mwdma_mask
;
4600 ap
->udma_mask
= ent
->udma_mask
;
4601 ap
->flags
|= ent
->host_flags
;
4602 ap
->ops
= ent
->port_ops
;
4603 ap
->cbl
= ATA_CBL_NONE
;
4604 ap
->active_tag
= ATA_TAG_POISON
;
4605 ap
->last_ctl
= 0xFF;
4607 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4608 INIT_LIST_HEAD(&ap
->eh_done_q
);
4610 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
4611 struct ata_device
*dev
= &ap
->device
[i
];
4613 dev
->pio_mask
= UINT_MAX
;
4614 dev
->mwdma_mask
= UINT_MAX
;
4615 dev
->udma_mask
= UINT_MAX
;
4619 ap
->stats
.unhandled_irq
= 1;
4620 ap
->stats
.idle_irq
= 1;
4623 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4627 * ata_host_add - Attach low-level ATA driver to system
4628 * @ent: Information provided by low-level driver
4629 * @host_set: Collections of ports to which we add
4630 * @port_no: Port number associated with this host
4632 * Attach low-level ATA driver to system.
4635 * PCI/etc. bus probe sem.
4638 * New ata_port on success, for NULL on error.
4641 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4642 struct ata_host_set
*host_set
,
4643 unsigned int port_no
)
4645 struct Scsi_Host
*host
;
4646 struct ata_port
*ap
;
4651 if (!ent
->port_ops
->probe_reset
&&
4652 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
4653 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
4658 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4662 host
->transportt
= &ata_scsi_transport_template
;
4664 ap
= (struct ata_port
*) &host
->hostdata
[0];
4666 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4668 rc
= ap
->ops
->port_start(ap
);
4675 scsi_host_put(host
);
4680 * ata_device_add - Register hardware device with ATA and SCSI layers
4681 * @ent: Probe information describing hardware device to be registered
4683 * This function processes the information provided in the probe
4684 * information struct @ent, allocates the necessary ATA and SCSI
4685 * host information structures, initializes them, and registers
4686 * everything with requisite kernel subsystems.
4688 * This function requests irqs, probes the ATA bus, and probes
4692 * PCI/etc. bus probe sem.
4695 * Number of ports registered. Zero on error (no ports registered).
4698 int ata_device_add(const struct ata_probe_ent
*ent
)
4700 unsigned int count
= 0, i
;
4701 struct device
*dev
= ent
->dev
;
4702 struct ata_host_set
*host_set
;
4705 /* alloc a container for our list of ATA ports (buses) */
4706 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4707 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4710 spin_lock_init(&host_set
->lock
);
4712 host_set
->dev
= dev
;
4713 host_set
->n_ports
= ent
->n_ports
;
4714 host_set
->irq
= ent
->irq
;
4715 host_set
->mmio_base
= ent
->mmio_base
;
4716 host_set
->private_data
= ent
->private_data
;
4717 host_set
->ops
= ent
->port_ops
;
4718 host_set
->flags
= ent
->host_set_flags
;
4720 /* register each port bound to this device */
4721 for (i
= 0; i
< ent
->n_ports
; i
++) {
4722 struct ata_port
*ap
;
4723 unsigned long xfer_mode_mask
;
4725 ap
= ata_host_add(ent
, host_set
, i
);
4729 host_set
->ports
[i
] = ap
;
4730 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4731 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4732 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4734 /* print per-port info to dmesg */
4735 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4736 "bmdma 0x%lX irq %lu\n",
4738 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4739 ata_mode_string(xfer_mode_mask
),
4740 ap
->ioaddr
.cmd_addr
,
4741 ap
->ioaddr
.ctl_addr
,
4742 ap
->ioaddr
.bmdma_addr
,
4746 host_set
->ops
->irq_clear(ap
);
4753 /* obtain irq, that is shared between channels */
4754 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4755 DRV_NAME
, host_set
))
4758 /* perform each probe synchronously */
4759 DPRINTK("probe begin\n");
4760 for (i
= 0; i
< count
; i
++) {
4761 struct ata_port
*ap
;
4764 ap
= host_set
->ports
[i
];
4766 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4767 rc
= ata_bus_probe(ap
);
4768 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4771 /* FIXME: do something useful here?
4772 * Current libata behavior will
4773 * tear down everything when
4774 * the module is removed
4775 * or the h/w is unplugged.
4779 rc
= scsi_add_host(ap
->host
, dev
);
4781 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4783 /* FIXME: do something useful here */
4784 /* FIXME: handle unconditional calls to
4785 * scsi_scan_host and ata_host_remove, below,
4791 /* probes are done, now scan each port's disk(s) */
4792 DPRINTK("host probe begin\n");
4793 for (i
= 0; i
< count
; i
++) {
4794 struct ata_port
*ap
= host_set
->ports
[i
];
4796 ata_scsi_scan_host(ap
);
4799 dev_set_drvdata(dev
, host_set
);
4801 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4802 return ent
->n_ports
; /* success */
4805 for (i
= 0; i
< count
; i
++) {
4806 ata_host_remove(host_set
->ports
[i
], 1);
4807 scsi_host_put(host_set
->ports
[i
]->host
);
4811 VPRINTK("EXIT, returning 0\n");
4816 * ata_host_set_remove - PCI layer callback for device removal
4817 * @host_set: ATA host set that was removed
4819 * Unregister all objects associated with this host set. Free those
4823 * Inherited from calling layer (may sleep).
4826 void ata_host_set_remove(struct ata_host_set
*host_set
)
4828 struct ata_port
*ap
;
4831 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4832 ap
= host_set
->ports
[i
];
4833 scsi_remove_host(ap
->host
);
4836 free_irq(host_set
->irq
, host_set
);
4838 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4839 ap
= host_set
->ports
[i
];
4841 ata_scsi_release(ap
->host
);
4843 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4844 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4846 if (ioaddr
->cmd_addr
== 0x1f0)
4847 release_region(0x1f0, 8);
4848 else if (ioaddr
->cmd_addr
== 0x170)
4849 release_region(0x170, 8);
4852 scsi_host_put(ap
->host
);
4855 if (host_set
->ops
->host_stop
)
4856 host_set
->ops
->host_stop(host_set
);
4862 * ata_scsi_release - SCSI layer callback hook for host unload
4863 * @host: libata host to be unloaded
4865 * Performs all duties necessary to shut down a libata port...
4866 * Kill port kthread, disable port, and release resources.
4869 * Inherited from SCSI layer.
4875 int ata_scsi_release(struct Scsi_Host
*host
)
4877 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4882 ap
->ops
->port_disable(ap
);
4883 ata_host_remove(ap
, 0);
4884 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4885 kfree(ap
->device
[i
].id
);
4892 * ata_std_ports - initialize ioaddr with standard port offsets.
4893 * @ioaddr: IO address structure to be initialized
4895 * Utility function which initializes data_addr, error_addr,
4896 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4897 * device_addr, status_addr, and command_addr to standard offsets
4898 * relative to cmd_addr.
4900 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4903 void ata_std_ports(struct ata_ioports
*ioaddr
)
4905 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4906 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4907 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4908 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4909 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4910 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4911 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4912 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4913 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4914 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4920 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4922 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4924 pci_iounmap(pdev
, host_set
->mmio_base
);
4928 * ata_pci_remove_one - PCI layer callback for device removal
4929 * @pdev: PCI device that was removed
4931 * PCI layer indicates to libata via this hook that
4932 * hot-unplug or module unload event has occurred.
4933 * Handle this by unregistering all objects associated
4934 * with this PCI device. Free those objects. Then finally
4935 * release PCI resources and disable device.
4938 * Inherited from PCI layer (may sleep).
4941 void ata_pci_remove_one (struct pci_dev
*pdev
)
4943 struct device
*dev
= pci_dev_to_dev(pdev
);
4944 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4946 ata_host_set_remove(host_set
);
4947 pci_release_regions(pdev
);
4948 pci_disable_device(pdev
);
4949 dev_set_drvdata(dev
, NULL
);
4952 /* move to PCI subsystem */
4953 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4955 unsigned long tmp
= 0;
4957 switch (bits
->width
) {
4960 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4966 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4972 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4983 return (tmp
== bits
->val
) ? 1 : 0;
4986 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4988 pci_save_state(pdev
);
4989 pci_disable_device(pdev
);
4990 pci_set_power_state(pdev
, PCI_D3hot
);
4994 int ata_pci_device_resume(struct pci_dev
*pdev
)
4996 pci_set_power_state(pdev
, PCI_D0
);
4997 pci_restore_state(pdev
);
4998 pci_enable_device(pdev
);
4999 pci_set_master(pdev
);
5002 #endif /* CONFIG_PCI */
5005 static int __init
ata_init(void)
5007 ata_wq
= create_workqueue("ata");
5011 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5015 static void __exit
ata_exit(void)
5017 destroy_workqueue(ata_wq
);
5020 module_init(ata_init
);
5021 module_exit(ata_exit
);
5023 static unsigned long ratelimit_time
;
5024 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5026 int ata_ratelimit(void)
5029 unsigned long flags
;
5031 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5033 if (time_after(jiffies
, ratelimit_time
)) {
5035 ratelimit_time
= jiffies
+ (HZ
/5);
5039 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5045 * libata is essentially a library of internal helper functions for
5046 * low-level ATA host controller drivers. As such, the API/ABI is
5047 * likely to change as new drivers are added and updated.
5048 * Do not depend on ABI/API stability.
5051 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5052 EXPORT_SYMBOL_GPL(ata_std_ports
);
5053 EXPORT_SYMBOL_GPL(ata_device_add
);
5054 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5055 EXPORT_SYMBOL_GPL(ata_sg_init
);
5056 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5057 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5058 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5059 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5060 EXPORT_SYMBOL_GPL(ata_tf_load
);
5061 EXPORT_SYMBOL_GPL(ata_tf_read
);
5062 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5063 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5064 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5065 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5066 EXPORT_SYMBOL_GPL(ata_check_status
);
5067 EXPORT_SYMBOL_GPL(ata_altstatus
);
5068 EXPORT_SYMBOL_GPL(ata_exec_command
);
5069 EXPORT_SYMBOL_GPL(ata_port_start
);
5070 EXPORT_SYMBOL_GPL(ata_port_stop
);
5071 EXPORT_SYMBOL_GPL(ata_host_stop
);
5072 EXPORT_SYMBOL_GPL(ata_interrupt
);
5073 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5074 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5075 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5076 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5077 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5078 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5079 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5080 EXPORT_SYMBOL_GPL(ata_port_probe
);
5081 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5082 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5083 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5084 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5085 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5086 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5087 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5088 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5089 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5090 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5091 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5092 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5093 EXPORT_SYMBOL_GPL(ata_port_disable
);
5094 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5095 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5096 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5097 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5098 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5099 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5100 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5101 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5102 EXPORT_SYMBOL_GPL(ata_host_intr
);
5103 EXPORT_SYMBOL_GPL(ata_id_string
);
5104 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5105 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5106 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5107 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5109 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5110 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5111 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5114 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5115 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5116 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5117 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5118 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5119 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5120 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5121 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5122 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5123 #endif /* CONFIG_PCI */
5125 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5126 EXPORT_SYMBOL_GPL(ata_device_resume
);
5127 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5128 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);