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
);
66 static void ata_set_mode(struct ata_port
*ap
);
67 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
);
68 static unsigned int ata_dev_xfermask(struct ata_port
*ap
,
69 struct ata_device
*dev
);
71 static unsigned int ata_unique_id
= 1;
72 static struct workqueue_struct
*ata_wq
;
74 int atapi_enabled
= 1;
75 module_param(atapi_enabled
, int, 0444);
76 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
79 module_param_named(fua
, libata_fua
, int, 0444);
80 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
82 MODULE_AUTHOR("Jeff Garzik");
83 MODULE_DESCRIPTION("Library module for ATA devices");
84 MODULE_LICENSE("GPL");
85 MODULE_VERSION(DRV_VERSION
);
89 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
90 * @tf: Taskfile to convert
91 * @fis: Buffer into which data will output
92 * @pmp: Port multiplier port
94 * Converts a standard ATA taskfile to a Serial ATA
95 * FIS structure (Register - Host to Device).
98 * Inherited from caller.
101 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
103 fis
[0] = 0x27; /* Register - Host to Device FIS */
104 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
105 bit 7 indicates Command FIS */
106 fis
[2] = tf
->command
;
107 fis
[3] = tf
->feature
;
114 fis
[8] = tf
->hob_lbal
;
115 fis
[9] = tf
->hob_lbam
;
116 fis
[10] = tf
->hob_lbah
;
117 fis
[11] = tf
->hob_feature
;
120 fis
[13] = tf
->hob_nsect
;
131 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
132 * @fis: Buffer from which data will be input
133 * @tf: Taskfile to output
135 * Converts a serial ATA FIS structure to a standard ATA taskfile.
138 * Inherited from caller.
141 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
143 tf
->command
= fis
[2]; /* status */
144 tf
->feature
= fis
[3]; /* error */
151 tf
->hob_lbal
= fis
[8];
152 tf
->hob_lbam
= fis
[9];
153 tf
->hob_lbah
= fis
[10];
156 tf
->hob_nsect
= fis
[13];
159 static const u8 ata_rw_cmds
[] = {
163 ATA_CMD_READ_MULTI_EXT
,
164 ATA_CMD_WRITE_MULTI_EXT
,
168 ATA_CMD_WRITE_MULTI_FUA_EXT
,
172 ATA_CMD_PIO_READ_EXT
,
173 ATA_CMD_PIO_WRITE_EXT
,
186 ATA_CMD_WRITE_FUA_EXT
190 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
191 * @qc: command to examine and configure
193 * Examine the device configuration and tf->flags to calculate
194 * the proper read/write commands and protocol to use.
199 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
201 struct ata_taskfile
*tf
= &qc
->tf
;
202 struct ata_device
*dev
= qc
->dev
;
205 int index
, fua
, lba48
, write
;
207 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
208 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
209 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
211 if (dev
->flags
& ATA_DFLAG_PIO
) {
212 tf
->protocol
= ATA_PROT_PIO
;
213 index
= dev
->multi_count
? 0 : 8;
214 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
215 /* Unable to use DMA due to host limitation */
216 tf
->protocol
= ATA_PROT_PIO
;
217 index
= dev
->multi_count
? 0 : 8;
219 tf
->protocol
= ATA_PROT_DMA
;
223 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
232 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
233 * @pio_mask: pio_mask
234 * @mwdma_mask: mwdma_mask
235 * @udma_mask: udma_mask
237 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
238 * unsigned int xfer_mask.
246 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
247 unsigned int mwdma_mask
,
248 unsigned int udma_mask
)
250 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
251 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
252 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
255 static const struct ata_xfer_ent
{
256 unsigned int shift
, bits
;
259 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
260 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
261 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
266 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
267 * @xfer_mask: xfer_mask of interest
269 * Return matching XFER_* value for @xfer_mask. Only the highest
270 * bit of @xfer_mask is considered.
276 * Matching XFER_* value, 0 if no match found.
278 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
280 int highbit
= fls(xfer_mask
) - 1;
281 const struct ata_xfer_ent
*ent
;
283 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
284 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
285 return ent
->base
+ highbit
- ent
->shift
;
290 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
291 * @xfer_mode: XFER_* of interest
293 * Return matching xfer_mask for @xfer_mode.
299 * Matching xfer_mask, 0 if no match found.
301 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
303 const struct ata_xfer_ent
*ent
;
305 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
306 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
307 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
312 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
313 * @xfer_mode: XFER_* of interest
315 * Return matching xfer_shift for @xfer_mode.
321 * Matching xfer_shift, -1 if no match found.
323 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
325 const struct ata_xfer_ent
*ent
;
327 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
328 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
334 * ata_mode_string - convert xfer_mask to string
335 * @xfer_mask: mask of bits supported; only highest bit counts.
337 * Determine string which represents the highest speed
338 * (highest bit in @modemask).
344 * Constant C string representing highest speed listed in
345 * @mode_mask, or the constant C string "<n/a>".
347 static const char *ata_mode_string(unsigned int xfer_mask
)
349 static const char * const xfer_mode_str
[] = {
369 highbit
= fls(xfer_mask
) - 1;
370 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
371 return xfer_mode_str
[highbit
];
376 * ata_pio_devchk - PATA device presence detection
377 * @ap: ATA channel to examine
378 * @device: Device to examine (starting at zero)
380 * This technique was originally described in
381 * Hale Landis's ATADRVR (www.ata-atapi.com), and
382 * later found its way into the ATA/ATAPI spec.
384 * Write a pattern to the ATA shadow registers,
385 * and if a device is present, it will respond by
386 * correctly storing and echoing back the
387 * ATA shadow register contents.
393 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
396 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
399 ap
->ops
->dev_select(ap
, device
);
401 outb(0x55, ioaddr
->nsect_addr
);
402 outb(0xaa, ioaddr
->lbal_addr
);
404 outb(0xaa, ioaddr
->nsect_addr
);
405 outb(0x55, ioaddr
->lbal_addr
);
407 outb(0x55, ioaddr
->nsect_addr
);
408 outb(0xaa, ioaddr
->lbal_addr
);
410 nsect
= inb(ioaddr
->nsect_addr
);
411 lbal
= inb(ioaddr
->lbal_addr
);
413 if ((nsect
== 0x55) && (lbal
== 0xaa))
414 return 1; /* we found a device */
416 return 0; /* nothing found */
420 * ata_mmio_devchk - PATA device presence detection
421 * @ap: ATA channel to examine
422 * @device: Device to examine (starting at zero)
424 * This technique was originally described in
425 * Hale Landis's ATADRVR (www.ata-atapi.com), and
426 * later found its way into the ATA/ATAPI spec.
428 * Write a pattern to the ATA shadow registers,
429 * and if a device is present, it will respond by
430 * correctly storing and echoing back the
431 * ATA shadow register contents.
437 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
440 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
443 ap
->ops
->dev_select(ap
, device
);
445 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
446 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
448 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
449 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
451 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
452 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
454 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
455 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
457 if ((nsect
== 0x55) && (lbal
== 0xaa))
458 return 1; /* we found a device */
460 return 0; /* nothing found */
464 * ata_devchk - PATA device presence detection
465 * @ap: ATA channel to examine
466 * @device: Device to examine (starting at zero)
468 * Dispatch ATA device presence detection, depending
469 * on whether we are using PIO or MMIO to talk to the
470 * ATA shadow registers.
476 static unsigned int ata_devchk(struct ata_port
*ap
,
479 if (ap
->flags
& ATA_FLAG_MMIO
)
480 return ata_mmio_devchk(ap
, device
);
481 return ata_pio_devchk(ap
, device
);
485 * ata_dev_classify - determine device type based on ATA-spec signature
486 * @tf: ATA taskfile register set for device to be identified
488 * Determine from taskfile register contents whether a device is
489 * ATA or ATAPI, as per "Signature and persistence" section
490 * of ATA/PI spec (volume 1, sect 5.14).
496 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
497 * the event of failure.
500 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
502 /* Apple's open source Darwin code hints that some devices only
503 * put a proper signature into the LBA mid/high registers,
504 * So, we only check those. It's sufficient for uniqueness.
507 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
508 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
509 DPRINTK("found ATA device by sig\n");
513 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
514 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
515 DPRINTK("found ATAPI device by sig\n");
516 return ATA_DEV_ATAPI
;
519 DPRINTK("unknown device\n");
520 return ATA_DEV_UNKNOWN
;
524 * ata_dev_try_classify - Parse returned ATA device signature
525 * @ap: ATA channel to examine
526 * @device: Device to examine (starting at zero)
527 * @r_err: Value of error register on completion
529 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
530 * an ATA/ATAPI-defined set of values is placed in the ATA
531 * shadow registers, indicating the results of device detection
534 * Select the ATA device, and read the values from the ATA shadow
535 * registers. Then parse according to the Error register value,
536 * and the spec-defined values examined by ata_dev_classify().
542 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
546 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
548 struct ata_taskfile tf
;
552 ap
->ops
->dev_select(ap
, device
);
554 memset(&tf
, 0, sizeof(tf
));
556 ap
->ops
->tf_read(ap
, &tf
);
561 /* see if device passed diags */
564 else if ((device
== 0) && (err
== 0x81))
569 /* determine if device is ATA or ATAPI */
570 class = ata_dev_classify(&tf
);
572 if (class == ATA_DEV_UNKNOWN
)
574 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
580 * ata_id_string - Convert IDENTIFY DEVICE page into string
581 * @id: IDENTIFY DEVICE results we will examine
582 * @s: string into which data is output
583 * @ofs: offset into identify device page
584 * @len: length of string to return. must be an even number.
586 * The strings in the IDENTIFY DEVICE page are broken up into
587 * 16-bit chunks. Run through the string, and output each
588 * 8-bit chunk linearly, regardless of platform.
594 void ata_id_string(const u16
*id
, unsigned char *s
,
595 unsigned int ofs
, unsigned int len
)
614 * ata_id_c_string - Convert IDENTIFY DEVICE page into C 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 odd number.
620 * This function is identical to ata_id_string except that it
621 * trims trailing spaces and terminates the resulting string with
622 * null. @len must be actual maximum length (even number) + 1.
627 void ata_id_c_string(const u16
*id
, unsigned char *s
,
628 unsigned int ofs
, unsigned int len
)
634 ata_id_string(id
, s
, ofs
, len
- 1);
636 p
= s
+ strnlen(s
, len
- 1);
637 while (p
> s
&& p
[-1] == ' ')
642 static u64
ata_id_n_sectors(const u16
*id
)
644 if (ata_id_has_lba(id
)) {
645 if (ata_id_has_lba48(id
))
646 return ata_id_u64(id
, 100);
648 return ata_id_u32(id
, 60);
650 if (ata_id_current_chs_valid(id
))
651 return ata_id_u32(id
, 57);
653 return id
[1] * id
[3] * id
[6];
658 * ata_noop_dev_select - Select device 0/1 on ATA bus
659 * @ap: ATA channel to manipulate
660 * @device: ATA device (numbered from zero) to select
662 * This function performs no actual function.
664 * May be used as the dev_select() entry in ata_port_operations.
669 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
675 * ata_std_dev_select - Select device 0/1 on ATA bus
676 * @ap: ATA channel to manipulate
677 * @device: ATA device (numbered from zero) to select
679 * Use the method defined in the ATA specification to
680 * make either device 0, or device 1, active on the
681 * ATA channel. Works with both PIO and MMIO.
683 * May be used as the dev_select() entry in ata_port_operations.
689 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
694 tmp
= ATA_DEVICE_OBS
;
696 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
698 if (ap
->flags
& ATA_FLAG_MMIO
) {
699 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
701 outb(tmp
, ap
->ioaddr
.device_addr
);
703 ata_pause(ap
); /* needed; also flushes, for mmio */
707 * ata_dev_select - Select device 0/1 on ATA bus
708 * @ap: ATA channel to manipulate
709 * @device: ATA device (numbered from zero) to select
710 * @wait: non-zero to wait for Status register BSY bit to clear
711 * @can_sleep: non-zero if context allows sleeping
713 * Use the method defined in the ATA specification to
714 * make either device 0, or device 1, active on the
717 * This is a high-level version of ata_std_dev_select(),
718 * which additionally provides the services of inserting
719 * the proper pauses and status polling, where needed.
725 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
726 unsigned int wait
, unsigned int can_sleep
)
728 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
729 ap
->id
, device
, wait
);
734 ap
->ops
->dev_select(ap
, device
);
737 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
744 * ata_dump_id - IDENTIFY DEVICE info debugging output
745 * @id: IDENTIFY DEVICE page to dump
747 * Dump selected 16-bit words from the given IDENTIFY DEVICE
754 static inline void ata_dump_id(const u16
*id
)
756 DPRINTK("49==0x%04x "
766 DPRINTK("80==0x%04x "
776 DPRINTK("88==0x%04x "
783 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
784 * @id: IDENTIFY data to compute xfer mask from
786 * Compute the xfermask for this device. This is not as trivial
787 * as it seems if we must consider early devices correctly.
789 * FIXME: pre IDE drive timing (do we care ?).
797 static unsigned int ata_id_xfermask(const u16
*id
)
799 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
801 /* Usual case. Word 53 indicates word 64 is valid */
802 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
803 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
807 /* If word 64 isn't valid then Word 51 high byte holds
808 * the PIO timing number for the maximum. Turn it into
811 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
813 /* But wait.. there's more. Design your standards by
814 * committee and you too can get a free iordy field to
815 * process. However its the speeds not the modes that
816 * are supported... Note drivers using the timing API
817 * will get this right anyway
821 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
824 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
825 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
827 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
831 * ata_port_queue_task - Queue port_task
832 * @ap: The ata_port to queue port_task for
834 * Schedule @fn(@data) for execution after @delay jiffies using
835 * port_task. There is one port_task per port and it's the
836 * user(low level driver)'s responsibility to make sure that only
837 * one task is active at any given time.
839 * libata core layer takes care of synchronization between
840 * port_task and EH. ata_port_queue_task() may be ignored for EH
844 * Inherited from caller.
846 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
851 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
854 PREPARE_WORK(&ap
->port_task
, fn
, data
);
857 rc
= queue_work(ata_wq
, &ap
->port_task
);
859 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
861 /* rc == 0 means that another user is using port task */
866 * ata_port_flush_task - Flush port_task
867 * @ap: The ata_port to flush port_task for
869 * After this function completes, port_task is guranteed not to
870 * be running or scheduled.
873 * Kernel thread context (may sleep)
875 void ata_port_flush_task(struct ata_port
*ap
)
881 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
882 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
883 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
885 DPRINTK("flush #1\n");
886 flush_workqueue(ata_wq
);
889 * At this point, if a task is running, it's guaranteed to see
890 * the FLUSH flag; thus, it will never queue pio tasks again.
893 if (!cancel_delayed_work(&ap
->port_task
)) {
894 DPRINTK("flush #2\n");
895 flush_workqueue(ata_wq
);
898 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
899 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
900 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
905 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
907 struct completion
*waiting
= qc
->private_data
;
909 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
914 * ata_exec_internal - execute libata internal command
915 * @ap: Port to which the command is sent
916 * @dev: Device to which the command is sent
917 * @tf: Taskfile registers for the command and the result
918 * @dma_dir: Data tranfer direction of the command
919 * @buf: Data buffer of the command
920 * @buflen: Length of data buffer
922 * Executes libata internal command with timeout. @tf contains
923 * command on entry and result on return. Timeout and error
924 * conditions are reported via return value. No recovery action
925 * is taken after a command times out. It's caller's duty to
926 * clean up after timeout.
929 * None. Should be called with kernel context, might sleep.
933 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
934 struct ata_taskfile
*tf
,
935 int dma_dir
, void *buf
, unsigned int buflen
)
937 u8 command
= tf
->command
;
938 struct ata_queued_cmd
*qc
;
939 DECLARE_COMPLETION(wait
);
941 unsigned int err_mask
;
943 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
945 qc
= ata_qc_new_init(ap
, dev
);
949 qc
->dma_dir
= dma_dir
;
950 if (dma_dir
!= DMA_NONE
) {
951 ata_sg_init_one(qc
, buf
, buflen
);
952 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
955 qc
->private_data
= &wait
;
956 qc
->complete_fn
= ata_qc_complete_internal
;
958 qc
->err_mask
= ata_qc_issue(qc
);
962 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
964 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
965 ata_port_flush_task(ap
);
967 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
969 /* We're racing with irq here. If we lose, the
970 * following test prevents us from completing the qc
971 * again. If completion irq occurs after here but
972 * before the caller cleans up, it will result in a
973 * spurious interrupt. We can live with that.
975 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
976 qc
->err_mask
= AC_ERR_TIMEOUT
;
978 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
982 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
986 err_mask
= qc
->err_mask
;
994 * ata_pio_need_iordy - check if iordy needed
997 * Check if the current speed of the device requires IORDY. Used
998 * by various controllers for chip configuration.
1001 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1004 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1011 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1013 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1014 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1015 /* Is the speed faster than the drive allows non IORDY ? */
1017 /* This is cycle times not frequency - watch the logic! */
1018 if (pio
> 240) /* PIO2 is 240nS per cycle */
1027 * ata_dev_read_id - Read ID data from the specified device
1028 * @ap: port on which target device resides
1029 * @dev: target device
1030 * @p_class: pointer to class of the target device (may be changed)
1031 * @post_reset: is this read ID post-reset?
1032 * @p_id: read IDENTIFY page (newly allocated)
1034 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1035 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1036 * devices. This function also takes care of EDD signature
1037 * misreporting (to be removed once EDD support is gone) and
1038 * issues ATA_CMD_INIT_DEV_PARAMS for pre-ATA4 drives.
1041 * Kernel thread context (may sleep)
1044 * 0 on success, -errno otherwise.
1046 static int ata_dev_read_id(struct ata_port
*ap
, struct ata_device
*dev
,
1047 unsigned int *p_class
, int post_reset
, u16
**p_id
)
1049 unsigned int class = *p_class
;
1050 unsigned int using_edd
;
1051 struct ata_taskfile tf
;
1052 unsigned int err_mask
= 0;
1057 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1059 if (ap
->ops
->probe_reset
||
1060 ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
1065 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1067 id
= kmalloc(sizeof(id
[0]) * ATA_ID_WORDS
, GFP_KERNEL
);
1070 reason
= "out of memory";
1075 ata_tf_init(ap
, &tf
, dev
->devno
);
1079 tf
.command
= ATA_CMD_ID_ATA
;
1082 tf
.command
= ATA_CMD_ID_ATAPI
;
1086 reason
= "unsupported class";
1090 tf
.protocol
= ATA_PROT_PIO
;
1092 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1093 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1097 reason
= "I/O error";
1099 if (err_mask
& ~AC_ERR_DEV
)
1103 * arg! EDD works for all test cases, but seems to return
1104 * the ATA signature for some ATAPI devices. Until the
1105 * reason for this is found and fixed, we fix up the mess
1106 * here. If IDENTIFY DEVICE returns command aborted
1107 * (as ATAPI devices do), then we issue an
1108 * IDENTIFY PACKET DEVICE.
1110 * ATA software reset (SRST, the default) does not appear
1111 * to have this problem.
1113 if ((using_edd
) && (class == ATA_DEV_ATA
)) {
1114 u8 err
= tf
.feature
;
1115 if (err
& ATA_ABORTED
) {
1116 class = ATA_DEV_ATAPI
;
1123 swap_buf_le16(id
, ATA_ID_WORDS
);
1126 if ((class == ATA_DEV_ATA
) != ata_id_is_ata(id
)) {
1128 reason
= "device reports illegal type";
1132 if (post_reset
&& class == ATA_DEV_ATA
) {
1134 * The exact sequence expected by certain pre-ATA4 drives is:
1137 * INITIALIZE DEVICE PARAMETERS
1139 * Some drives were very specific about that exact sequence.
1141 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1142 err_mask
= ata_dev_init_params(ap
, dev
);
1145 reason
= "INIT_DEV_PARAMS failed";
1149 /* current CHS translation info (id[53-58]) might be
1150 * changed. reread the identify device info.
1162 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1163 ap
->id
, dev
->devno
, reason
);
1168 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1169 struct ata_device
*dev
)
1171 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1175 * ata_dev_configure - Configure the specified ATA/ATAPI device
1176 * @ap: Port on which target device resides
1177 * @dev: Target device to configure
1178 * @print_info: Enable device info printout
1180 * Configure @dev according to @dev->id. Generic and low-level
1181 * driver specific fixups are also applied.
1184 * Kernel thread context (may sleep)
1187 * 0 on success, -errno otherwise
1189 static int ata_dev_configure(struct ata_port
*ap
, struct ata_device
*dev
,
1192 const u16
*id
= dev
->id
;
1193 unsigned int xfer_mask
;
1196 if (!ata_dev_present(dev
)) {
1197 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1198 ap
->id
, dev
->devno
);
1202 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1204 /* print device capabilities */
1206 printk(KERN_DEBUG
"ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1207 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1208 ap
->id
, dev
->devno
, id
[49], id
[82], id
[83],
1209 id
[84], id
[85], id
[86], id
[87], id
[88]);
1211 /* initialize to-be-configured parameters */
1213 dev
->max_sectors
= 0;
1221 * common ATA, ATAPI feature tests
1224 /* we require DMA support (bits 8 of word 49) */
1225 if (!ata_id_has_dma(id
)) {
1226 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1231 /* find max transfer mode; for printk only */
1232 xfer_mask
= ata_id_xfermask(id
);
1236 /* ATA-specific feature tests */
1237 if (dev
->class == ATA_DEV_ATA
) {
1238 dev
->n_sectors
= ata_id_n_sectors(id
);
1240 if (ata_id_has_lba(id
)) {
1241 const char *lba_desc
;
1244 dev
->flags
|= ATA_DFLAG_LBA
;
1245 if (ata_id_has_lba48(id
)) {
1246 dev
->flags
|= ATA_DFLAG_LBA48
;
1250 /* print device info to dmesg */
1252 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1253 "max %s, %Lu sectors: %s\n",
1255 ata_id_major_version(id
),
1256 ata_mode_string(xfer_mask
),
1257 (unsigned long long)dev
->n_sectors
,
1262 /* Default translation */
1263 dev
->cylinders
= id
[1];
1265 dev
->sectors
= id
[6];
1267 if (ata_id_current_chs_valid(id
)) {
1268 /* Current CHS translation is valid. */
1269 dev
->cylinders
= id
[54];
1270 dev
->heads
= id
[55];
1271 dev
->sectors
= id
[56];
1274 /* print device info to dmesg */
1276 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1277 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1279 ata_id_major_version(id
),
1280 ata_mode_string(xfer_mask
),
1281 (unsigned long long)dev
->n_sectors
,
1282 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1288 /* ATAPI-specific feature tests */
1289 else if (dev
->class == ATA_DEV_ATAPI
) {
1290 rc
= atapi_cdb_len(id
);
1291 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1292 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1296 dev
->cdb_len
= (unsigned int) rc
;
1298 /* print device info to dmesg */
1300 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1301 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1304 ap
->host
->max_cmd_len
= 0;
1305 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1306 ap
->host
->max_cmd_len
= max_t(unsigned int,
1307 ap
->host
->max_cmd_len
,
1308 ap
->device
[i
].cdb_len
);
1310 /* limit bridge transfers to udma5, 200 sectors */
1311 if (ata_dev_knobble(ap
, dev
)) {
1313 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1314 ap
->id
, dev
->devno
);
1315 ap
->udma_mask
&= ATA_UDMA5
;
1316 dev
->max_sectors
= ATA_MAX_SECTORS
;
1319 if (ap
->ops
->dev_config
)
1320 ap
->ops
->dev_config(ap
, dev
);
1322 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1326 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1327 ap
->id
, dev
->devno
);
1328 DPRINTK("EXIT, err\n");
1333 * ata_bus_probe - Reset and probe ATA bus
1336 * Master ATA bus probing function. Initiates a hardware-dependent
1337 * bus reset, then attempts to identify any devices found on
1341 * PCI/etc. bus probe sem.
1344 * Zero on success, non-zero on error.
1347 static int ata_bus_probe(struct ata_port
*ap
)
1349 unsigned int classes
[ATA_MAX_DEVICES
];
1350 unsigned int i
, rc
, found
= 0;
1354 /* reset and determine device classes */
1355 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1356 classes
[i
] = ATA_DEV_UNKNOWN
;
1358 if (ap
->ops
->probe_reset
) {
1359 rc
= ap
->ops
->probe_reset(ap
, classes
);
1361 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1365 ap
->ops
->phy_reset(ap
);
1367 if (!(ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1368 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1369 classes
[i
] = ap
->device
[i
].class;
1374 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1375 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1376 classes
[i
] = ATA_DEV_NONE
;
1378 /* read IDENTIFY page and configure devices */
1379 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1380 struct ata_device
*dev
= &ap
->device
[i
];
1382 dev
->class = classes
[i
];
1384 if (!ata_dev_present(dev
))
1387 WARN_ON(dev
->id
!= NULL
);
1388 if (ata_dev_read_id(ap
, dev
, &dev
->class, 1, &dev
->id
)) {
1389 dev
->class = ATA_DEV_NONE
;
1393 if (ata_dev_configure(ap
, dev
, 1)) {
1394 dev
->class++; /* disable device */
1402 goto err_out_disable
;
1405 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1406 goto err_out_disable
;
1411 ap
->ops
->port_disable(ap
);
1416 * ata_port_probe - Mark port as enabled
1417 * @ap: Port for which we indicate enablement
1419 * Modify @ap data structure such that the system
1420 * thinks that the entire port is enabled.
1422 * LOCKING: host_set lock, or some other form of
1426 void ata_port_probe(struct ata_port
*ap
)
1428 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1432 * sata_print_link_status - Print SATA link status
1433 * @ap: SATA port to printk link status about
1435 * This function prints link speed and status of a SATA link.
1440 static void sata_print_link_status(struct ata_port
*ap
)
1445 if (!ap
->ops
->scr_read
)
1448 sstatus
= scr_read(ap
, SCR_STATUS
);
1450 if (sata_dev_present(ap
)) {
1451 tmp
= (sstatus
>> 4) & 0xf;
1454 else if (tmp
& (1 << 1))
1457 speed
= "<unknown>";
1458 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1459 ap
->id
, speed
, sstatus
);
1461 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1467 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1468 * @ap: SATA port associated with target SATA PHY.
1470 * This function issues commands to standard SATA Sxxx
1471 * PHY registers, to wake up the phy (and device), and
1472 * clear any reset condition.
1475 * PCI/etc. bus probe sem.
1478 void __sata_phy_reset(struct ata_port
*ap
)
1481 unsigned long timeout
= jiffies
+ (HZ
* 5);
1483 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1484 /* issue phy wake/reset */
1485 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1486 /* Couldn't find anything in SATA I/II specs, but
1487 * AHCI-1.1 10.4.2 says at least 1 ms. */
1490 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1492 /* wait for phy to become ready, if necessary */
1495 sstatus
= scr_read(ap
, SCR_STATUS
);
1496 if ((sstatus
& 0xf) != 1)
1498 } while (time_before(jiffies
, timeout
));
1500 /* print link status */
1501 sata_print_link_status(ap
);
1503 /* TODO: phy layer with polling, timeouts, etc. */
1504 if (sata_dev_present(ap
))
1507 ata_port_disable(ap
);
1509 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1512 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1513 ata_port_disable(ap
);
1517 ap
->cbl
= ATA_CBL_SATA
;
1521 * sata_phy_reset - Reset SATA bus.
1522 * @ap: SATA port associated with target SATA PHY.
1524 * This function resets the SATA bus, and then probes
1525 * the bus for devices.
1528 * PCI/etc. bus probe sem.
1531 void sata_phy_reset(struct ata_port
*ap
)
1533 __sata_phy_reset(ap
);
1534 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1540 * ata_port_disable - Disable port.
1541 * @ap: Port to be disabled.
1543 * Modify @ap data structure such that the system
1544 * thinks that the entire port is disabled, and should
1545 * never attempt to probe or communicate with devices
1548 * LOCKING: host_set lock, or some other form of
1552 void ata_port_disable(struct ata_port
*ap
)
1554 ap
->device
[0].class = ATA_DEV_NONE
;
1555 ap
->device
[1].class = ATA_DEV_NONE
;
1556 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1560 * This mode timing computation functionality is ported over from
1561 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1564 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1565 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1566 * for PIO 5, which is a nonstandard extension and UDMA6, which
1567 * is currently supported only by Maxtor drives.
1570 static const struct ata_timing ata_timing
[] = {
1572 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1573 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1574 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1575 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1577 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1578 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1579 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1581 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1583 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1584 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1585 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1587 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1588 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1589 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1591 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1592 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1593 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1595 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1596 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1597 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1599 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1604 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1605 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1607 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1609 q
->setup
= EZ(t
->setup
* 1000, T
);
1610 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1611 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1612 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1613 q
->active
= EZ(t
->active
* 1000, T
);
1614 q
->recover
= EZ(t
->recover
* 1000, T
);
1615 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1616 q
->udma
= EZ(t
->udma
* 1000, UT
);
1619 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1620 struct ata_timing
*m
, unsigned int what
)
1622 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1623 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1624 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1625 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1626 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1627 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1628 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1629 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1632 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1634 const struct ata_timing
*t
;
1636 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1637 if (t
->mode
== 0xFF)
1642 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1643 struct ata_timing
*t
, int T
, int UT
)
1645 const struct ata_timing
*s
;
1646 struct ata_timing p
;
1652 if (!(s
= ata_timing_find_mode(speed
)))
1655 memcpy(t
, s
, sizeof(*s
));
1658 * If the drive is an EIDE drive, it can tell us it needs extended
1659 * PIO/MW_DMA cycle timing.
1662 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1663 memset(&p
, 0, sizeof(p
));
1664 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1665 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1666 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1667 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1668 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1670 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1674 * Convert the timing to bus clock counts.
1677 ata_timing_quantize(t
, t
, T
, UT
);
1680 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1681 * S.M.A.R.T * and some other commands. We have to ensure that the
1682 * DMA cycle timing is slower/equal than the fastest PIO timing.
1685 if (speed
> XFER_PIO_4
) {
1686 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1687 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1691 * Lengthen active & recovery time so that cycle time is correct.
1694 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1695 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1696 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1699 if (t
->active
+ t
->recover
< t
->cycle
) {
1700 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1701 t
->recover
= t
->cycle
- t
->active
;
1707 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1709 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1712 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1713 dev
->flags
|= ATA_DFLAG_PIO
;
1715 ata_dev_set_xfermode(ap
, dev
);
1717 if (ata_dev_revalidate(ap
, dev
, 0)) {
1718 printk(KERN_ERR
"ata%u: failed to revalidate after set "
1719 "xfermode, disabled\n", ap
->id
);
1720 ata_port_disable(ap
);
1723 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1724 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1726 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1728 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1731 static int ata_host_set_pio(struct ata_port
*ap
)
1735 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1736 struct ata_device
*dev
= &ap
->device
[i
];
1738 if (!ata_dev_present(dev
))
1741 if (!dev
->pio_mode
) {
1742 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1746 dev
->xfer_mode
= dev
->pio_mode
;
1747 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1748 if (ap
->ops
->set_piomode
)
1749 ap
->ops
->set_piomode(ap
, dev
);
1755 static void ata_host_set_dma(struct ata_port
*ap
)
1759 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1760 struct ata_device
*dev
= &ap
->device
[i
];
1762 if (!ata_dev_present(dev
) || !dev
->dma_mode
)
1765 dev
->xfer_mode
= dev
->dma_mode
;
1766 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
1767 if (ap
->ops
->set_dmamode
)
1768 ap
->ops
->set_dmamode(ap
, dev
);
1773 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1774 * @ap: port on which timings will be programmed
1776 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1779 * PCI/etc. bus probe sem.
1781 static void ata_set_mode(struct ata_port
*ap
)
1785 /* step 1: calculate xfer_mask */
1786 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1787 struct ata_device
*dev
= &ap
->device
[i
];
1788 unsigned int xfer_mask
;
1790 if (!ata_dev_present(dev
))
1793 xfer_mask
= ata_dev_xfermask(ap
, dev
);
1795 dev
->pio_mode
= ata_xfer_mask2mode(xfer_mask
& ATA_MASK_PIO
);
1796 dev
->dma_mode
= ata_xfer_mask2mode(xfer_mask
& (ATA_MASK_MWDMA
|
1800 /* step 2: always set host PIO timings */
1801 rc
= ata_host_set_pio(ap
);
1805 /* step 3: set host DMA timings */
1806 ata_host_set_dma(ap
);
1808 /* step 4: update devices' xfer mode */
1809 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1810 ata_dev_set_mode(ap
, &ap
->device
[i
]);
1812 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1815 if (ap
->ops
->post_set_mode
)
1816 ap
->ops
->post_set_mode(ap
);
1821 ata_port_disable(ap
);
1825 * ata_tf_to_host - issue ATA taskfile to host controller
1826 * @ap: port to which command is being issued
1827 * @tf: ATA taskfile register set
1829 * Issues ATA taskfile register set to ATA host controller,
1830 * with proper synchronization with interrupt handler and
1834 * spin_lock_irqsave(host_set lock)
1837 static inline void ata_tf_to_host(struct ata_port
*ap
,
1838 const struct ata_taskfile
*tf
)
1840 ap
->ops
->tf_load(ap
, tf
);
1841 ap
->ops
->exec_command(ap
, tf
);
1845 * ata_busy_sleep - sleep until BSY clears, or timeout
1846 * @ap: port containing status register to be polled
1847 * @tmout_pat: impatience timeout
1848 * @tmout: overall timeout
1850 * Sleep until ATA Status register bit BSY clears,
1851 * or a timeout occurs.
1856 unsigned int ata_busy_sleep (struct ata_port
*ap
,
1857 unsigned long tmout_pat
, unsigned long tmout
)
1859 unsigned long timer_start
, timeout
;
1862 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1863 timer_start
= jiffies
;
1864 timeout
= timer_start
+ tmout_pat
;
1865 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1867 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1870 if (status
& ATA_BUSY
)
1871 printk(KERN_WARNING
"ata%u is slow to respond, "
1872 "please be patient\n", ap
->id
);
1874 timeout
= timer_start
+ tmout
;
1875 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1877 status
= ata_chk_status(ap
);
1880 if (status
& ATA_BUSY
) {
1881 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1882 ap
->id
, tmout
/ HZ
);
1889 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1891 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1892 unsigned int dev0
= devmask
& (1 << 0);
1893 unsigned int dev1
= devmask
& (1 << 1);
1894 unsigned long timeout
;
1896 /* if device 0 was found in ata_devchk, wait for its
1900 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1902 /* if device 1 was found in ata_devchk, wait for
1903 * register access, then wait for BSY to clear
1905 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1909 ap
->ops
->dev_select(ap
, 1);
1910 if (ap
->flags
& ATA_FLAG_MMIO
) {
1911 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1912 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1914 nsect
= inb(ioaddr
->nsect_addr
);
1915 lbal
= inb(ioaddr
->lbal_addr
);
1917 if ((nsect
== 1) && (lbal
== 1))
1919 if (time_after(jiffies
, timeout
)) {
1923 msleep(50); /* give drive a breather */
1926 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1928 /* is all this really necessary? */
1929 ap
->ops
->dev_select(ap
, 0);
1931 ap
->ops
->dev_select(ap
, 1);
1933 ap
->ops
->dev_select(ap
, 0);
1937 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1938 * @ap: Port to reset and probe
1940 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1941 * probe the bus. Not often used these days.
1944 * PCI/etc. bus probe sem.
1945 * Obtains host_set lock.
1949 static unsigned int ata_bus_edd(struct ata_port
*ap
)
1951 struct ata_taskfile tf
;
1952 unsigned long flags
;
1954 /* set up execute-device-diag (bus reset) taskfile */
1955 /* also, take interrupts to a known state (disabled) */
1956 DPRINTK("execute-device-diag\n");
1957 ata_tf_init(ap
, &tf
, 0);
1959 tf
.command
= ATA_CMD_EDD
;
1960 tf
.protocol
= ATA_PROT_NODATA
;
1963 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1964 ata_tf_to_host(ap
, &tf
);
1965 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1967 /* spec says at least 2ms. but who knows with those
1968 * crazy ATAPI devices...
1972 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1975 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1976 unsigned int devmask
)
1978 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1980 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
1982 /* software reset. causes dev0 to be selected */
1983 if (ap
->flags
& ATA_FLAG_MMIO
) {
1984 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1985 udelay(20); /* FIXME: flush */
1986 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
1987 udelay(20); /* FIXME: flush */
1988 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1990 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1992 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
1994 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1997 /* spec mandates ">= 2ms" before checking status.
1998 * We wait 150ms, because that was the magic delay used for
1999 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2000 * between when the ATA command register is written, and then
2001 * status is checked. Because waiting for "a while" before
2002 * checking status is fine, post SRST, we perform this magic
2003 * delay here as well.
2007 ata_bus_post_reset(ap
, devmask
);
2013 * ata_bus_reset - reset host port and associated ATA channel
2014 * @ap: port to reset
2016 * This is typically the first time we actually start issuing
2017 * commands to the ATA channel. We wait for BSY to clear, then
2018 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2019 * result. Determine what devices, if any, are on the channel
2020 * by looking at the device 0/1 error register. Look at the signature
2021 * stored in each device's taskfile registers, to determine if
2022 * the device is ATA or ATAPI.
2025 * PCI/etc. bus probe sem.
2026 * Obtains host_set lock.
2029 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2032 void ata_bus_reset(struct ata_port
*ap
)
2034 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2035 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2037 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
2039 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2041 /* determine if device 0/1 are present */
2042 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2045 dev0
= ata_devchk(ap
, 0);
2047 dev1
= ata_devchk(ap
, 1);
2051 devmask
|= (1 << 0);
2053 devmask
|= (1 << 1);
2055 /* select device 0 again */
2056 ap
->ops
->dev_select(ap
, 0);
2058 /* issue bus reset */
2059 if (ap
->flags
& ATA_FLAG_SRST
)
2060 rc
= ata_bus_softreset(ap
, devmask
);
2061 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
2062 /* set up device control */
2063 if (ap
->flags
& ATA_FLAG_MMIO
)
2064 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2066 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2067 rc
= ata_bus_edd(ap
);
2074 * determine by signature whether we have ATA or ATAPI devices
2076 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2077 if ((slave_possible
) && (err
!= 0x81))
2078 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2080 /* re-enable interrupts */
2081 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2084 /* is double-select really necessary? */
2085 if (ap
->device
[1].class != ATA_DEV_NONE
)
2086 ap
->ops
->dev_select(ap
, 1);
2087 if (ap
->device
[0].class != ATA_DEV_NONE
)
2088 ap
->ops
->dev_select(ap
, 0);
2090 /* if no devices were detected, disable this port */
2091 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2092 (ap
->device
[1].class == ATA_DEV_NONE
))
2095 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2096 /* set up device control for ATA_FLAG_SATA_RESET */
2097 if (ap
->flags
& ATA_FLAG_MMIO
)
2098 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2100 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2107 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2108 ap
->ops
->port_disable(ap
);
2113 static int sata_phy_resume(struct ata_port
*ap
)
2115 unsigned long timeout
= jiffies
+ (HZ
* 5);
2118 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
2120 /* Wait for phy to become ready, if necessary. */
2123 sstatus
= scr_read(ap
, SCR_STATUS
);
2124 if ((sstatus
& 0xf) != 1)
2126 } while (time_before(jiffies
, timeout
));
2132 * ata_std_probeinit - initialize probing
2133 * @ap: port to be probed
2135 * @ap is about to be probed. Initialize it. This function is
2136 * to be used as standard callback for ata_drive_probe_reset().
2138 * NOTE!!! Do not use this function as probeinit if a low level
2139 * driver implements only hardreset. Just pass NULL as probeinit
2140 * in that case. Using this function is probably okay but doing
2141 * so makes reset sequence different from the original
2142 * ->phy_reset implementation and Jeff nervous. :-P
2144 extern void ata_std_probeinit(struct ata_port
*ap
)
2146 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
) {
2147 sata_phy_resume(ap
);
2148 if (sata_dev_present(ap
))
2149 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2154 * ata_std_softreset - reset host port via ATA SRST
2155 * @ap: port to reset
2156 * @verbose: fail verbosely
2157 * @classes: resulting classes of attached devices
2159 * Reset host port using ATA SRST. This function is to be used
2160 * as standard callback for ata_drive_*_reset() functions.
2163 * Kernel thread context (may sleep)
2166 * 0 on success, -errno otherwise.
2168 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2170 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2171 unsigned int devmask
= 0, err_mask
;
2176 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2177 classes
[0] = ATA_DEV_NONE
;
2181 /* determine if device 0/1 are present */
2182 if (ata_devchk(ap
, 0))
2183 devmask
|= (1 << 0);
2184 if (slave_possible
&& ata_devchk(ap
, 1))
2185 devmask
|= (1 << 1);
2187 /* select device 0 again */
2188 ap
->ops
->dev_select(ap
, 0);
2190 /* issue bus reset */
2191 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2192 err_mask
= ata_bus_softreset(ap
, devmask
);
2195 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2198 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2203 /* determine by signature whether we have ATA or ATAPI devices */
2204 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2205 if (slave_possible
&& err
!= 0x81)
2206 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2209 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2214 * sata_std_hardreset - reset host port via SATA phy reset
2215 * @ap: port to reset
2216 * @verbose: fail verbosely
2217 * @class: resulting class of attached device
2219 * SATA phy-reset host port using DET bits of SControl register.
2220 * This function is to be used as standard callback for
2221 * ata_drive_*_reset().
2224 * Kernel thread context (may sleep)
2227 * 0 on success, -errno otherwise.
2229 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2233 /* Issue phy wake/reset */
2234 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2237 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2238 * 10.4.2 says at least 1 ms.
2242 /* Bring phy back */
2243 sata_phy_resume(ap
);
2245 /* TODO: phy layer with polling, timeouts, etc. */
2246 if (!sata_dev_present(ap
)) {
2247 *class = ATA_DEV_NONE
;
2248 DPRINTK("EXIT, link offline\n");
2252 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2254 printk(KERN_ERR
"ata%u: COMRESET failed "
2255 "(device not ready)\n", ap
->id
);
2257 DPRINTK("EXIT, device not ready\n");
2261 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2263 *class = ata_dev_try_classify(ap
, 0, NULL
);
2265 DPRINTK("EXIT, class=%u\n", *class);
2270 * ata_std_postreset - standard postreset callback
2271 * @ap: the target ata_port
2272 * @classes: classes of attached devices
2274 * This function is invoked after a successful reset. Note that
2275 * the device might have been reset more than once using
2276 * different reset methods before postreset is invoked.
2278 * This function is to be used as standard callback for
2279 * ata_drive_*_reset().
2282 * Kernel thread context (may sleep)
2284 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2288 /* set cable type if it isn't already set */
2289 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2290 ap
->cbl
= ATA_CBL_SATA
;
2292 /* print link status */
2293 if (ap
->cbl
== ATA_CBL_SATA
)
2294 sata_print_link_status(ap
);
2296 /* re-enable interrupts */
2297 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2300 /* is double-select really necessary? */
2301 if (classes
[0] != ATA_DEV_NONE
)
2302 ap
->ops
->dev_select(ap
, 1);
2303 if (classes
[1] != ATA_DEV_NONE
)
2304 ap
->ops
->dev_select(ap
, 0);
2306 /* bail out if no device is present */
2307 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2308 DPRINTK("EXIT, no device\n");
2312 /* set up device control */
2313 if (ap
->ioaddr
.ctl_addr
) {
2314 if (ap
->flags
& ATA_FLAG_MMIO
)
2315 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2317 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2324 * ata_std_probe_reset - standard probe reset method
2325 * @ap: prot to perform probe-reset
2326 * @classes: resulting classes of attached devices
2328 * The stock off-the-shelf ->probe_reset method.
2331 * Kernel thread context (may sleep)
2334 * 0 on success, -errno otherwise.
2336 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2338 ata_reset_fn_t hardreset
;
2341 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2342 hardreset
= sata_std_hardreset
;
2344 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2345 ata_std_softreset
, hardreset
,
2346 ata_std_postreset
, classes
);
2349 static int do_probe_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2350 ata_postreset_fn_t postreset
,
2351 unsigned int *classes
)
2355 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2356 classes
[i
] = ATA_DEV_UNKNOWN
;
2358 rc
= reset(ap
, 0, classes
);
2362 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2363 * is complete and convert all ATA_DEV_UNKNOWN to
2366 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2367 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2370 if (i
< ATA_MAX_DEVICES
)
2371 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2372 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2373 classes
[i
] = ATA_DEV_NONE
;
2376 postreset(ap
, classes
);
2378 return classes
[0] != ATA_DEV_UNKNOWN
? 0 : -ENODEV
;
2382 * ata_drive_probe_reset - Perform probe reset with given methods
2383 * @ap: port to reset
2384 * @probeinit: probeinit method (can be NULL)
2385 * @softreset: softreset method (can be NULL)
2386 * @hardreset: hardreset method (can be NULL)
2387 * @postreset: postreset method (can be NULL)
2388 * @classes: resulting classes of attached devices
2390 * Reset the specified port and classify attached devices using
2391 * given methods. This function prefers softreset but tries all
2392 * possible reset sequences to reset and classify devices. This
2393 * function is intended to be used for constructing ->probe_reset
2394 * callback by low level drivers.
2396 * Reset methods should follow the following rules.
2398 * - Return 0 on sucess, -errno on failure.
2399 * - If classification is supported, fill classes[] with
2400 * recognized class codes.
2401 * - If classification is not supported, leave classes[] alone.
2402 * - If verbose is non-zero, print error message on failure;
2403 * otherwise, shut up.
2406 * Kernel thread context (may sleep)
2409 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2410 * if classification fails, and any error code from reset
2413 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2414 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2415 ata_postreset_fn_t postreset
, unsigned int *classes
)
2423 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2431 rc
= do_probe_reset(ap
, hardreset
, postreset
, classes
);
2432 if (rc
== 0 || rc
!= -ENODEV
)
2436 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2442 * ata_dev_same_device - Determine whether new ID matches configured device
2443 * @ap: port on which the device to compare against resides
2444 * @dev: device to compare against
2445 * @new_class: class of the new device
2446 * @new_id: IDENTIFY page of the new device
2448 * Compare @new_class and @new_id against @dev and determine
2449 * whether @dev is the device indicated by @new_class and
2456 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2458 static int ata_dev_same_device(struct ata_port
*ap
, struct ata_device
*dev
,
2459 unsigned int new_class
, const u16
*new_id
)
2461 const u16
*old_id
= dev
->id
;
2462 unsigned char model
[2][41], serial
[2][21];
2465 if (dev
->class != new_class
) {
2467 "ata%u: dev %u class mismatch %d != %d\n",
2468 ap
->id
, dev
->devno
, dev
->class, new_class
);
2472 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2473 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2474 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2475 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2476 new_n_sectors
= ata_id_n_sectors(new_id
);
2478 if (strcmp(model
[0], model
[1])) {
2480 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2481 ap
->id
, dev
->devno
, model
[0], model
[1]);
2485 if (strcmp(serial
[0], serial
[1])) {
2487 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2488 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2492 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2494 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2495 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2496 (unsigned long long)new_n_sectors
);
2504 * ata_dev_revalidate - Revalidate ATA device
2505 * @ap: port on which the device to revalidate resides
2506 * @dev: device to revalidate
2507 * @post_reset: is this revalidation after reset?
2509 * Re-read IDENTIFY page and make sure @dev is still attached to
2513 * Kernel thread context (may sleep)
2516 * 0 on success, negative errno otherwise
2518 int ata_dev_revalidate(struct ata_port
*ap
, struct ata_device
*dev
,
2525 if (!ata_dev_present(dev
))
2531 /* allocate & read ID data */
2532 rc
= ata_dev_read_id(ap
, dev
, &class, post_reset
, &id
);
2536 /* is the device still there? */
2537 if (!ata_dev_same_device(ap
, dev
, class, id
)) {
2545 /* configure device according to the new ID */
2546 return ata_dev_configure(ap
, dev
, 0);
2549 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2550 ap
->id
, dev
->devno
, rc
);
2555 static const char * const ata_dma_blacklist
[] = {
2574 "Toshiba CD-ROM XM-6202B",
2575 "TOSHIBA CD-ROM XM-1702BC",
2577 "E-IDE CD-ROM CR-840",
2580 "SAMSUNG CD-ROM SC-148C",
2581 "SAMSUNG CD-ROM SC",
2583 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2587 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2589 unsigned char model_num
[41];
2592 ata_id_c_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
, sizeof(model_num
));
2594 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2595 if (!strcmp(ata_dma_blacklist
[i
], model_num
))
2602 * ata_dev_xfermask - Compute supported xfermask of the given device
2603 * @ap: Port on which the device to compute xfermask for resides
2604 * @dev: Device to compute xfermask for
2606 * Compute supported xfermask of @dev. This function is
2607 * responsible for applying all known limits including host
2608 * controller limits, device blacklist, etc...
2614 * Computed xfermask.
2616 static unsigned int ata_dev_xfermask(struct ata_port
*ap
,
2617 struct ata_device
*dev
)
2619 unsigned long xfer_mask
;
2622 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
, ap
->mwdma_mask
,
2625 /* use port-wide xfermask for now */
2626 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2627 struct ata_device
*d
= &ap
->device
[i
];
2628 if (!ata_dev_present(d
))
2630 xfer_mask
&= ata_id_xfermask(d
->id
);
2631 if (ata_dma_blacklisted(d
))
2632 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2635 if (ata_dma_blacklisted(dev
))
2636 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, "
2637 "disabling DMA\n", ap
->id
, dev
->devno
);
2643 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2644 * @ap: Port associated with device @dev
2645 * @dev: Device to which command will be sent
2647 * Issue SET FEATURES - XFER MODE command to device @dev
2651 * PCI/etc. bus probe sem.
2654 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2656 struct ata_taskfile tf
;
2658 /* set up set-features taskfile */
2659 DPRINTK("set features - xfer mode\n");
2661 ata_tf_init(ap
, &tf
, dev
->devno
);
2662 tf
.command
= ATA_CMD_SET_FEATURES
;
2663 tf
.feature
= SETFEATURES_XFER
;
2664 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2665 tf
.protocol
= ATA_PROT_NODATA
;
2666 tf
.nsect
= dev
->xfer_mode
;
2668 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2669 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2671 ata_port_disable(ap
);
2678 * ata_dev_init_params - Issue INIT DEV PARAMS command
2679 * @ap: Port associated with device @dev
2680 * @dev: Device to which command will be sent
2683 * Kernel thread context (may sleep)
2686 * 0 on success, AC_ERR_* mask otherwise.
2689 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
2690 struct ata_device
*dev
)
2692 struct ata_taskfile tf
;
2693 unsigned int err_mask
;
2694 u16 sectors
= dev
->id
[6];
2695 u16 heads
= dev
->id
[3];
2697 /* Number of sectors per track 1-255. Number of heads 1-16 */
2698 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2701 /* set up init dev params taskfile */
2702 DPRINTK("init dev params \n");
2704 ata_tf_init(ap
, &tf
, dev
->devno
);
2705 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2706 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2707 tf
.protocol
= ATA_PROT_NODATA
;
2709 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2711 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2713 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2718 * ata_sg_clean - Unmap DMA memory associated with command
2719 * @qc: Command containing DMA memory to be released
2721 * Unmap all mapped DMA memory associated with this command.
2724 * spin_lock_irqsave(host_set lock)
2727 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2729 struct ata_port
*ap
= qc
->ap
;
2730 struct scatterlist
*sg
= qc
->__sg
;
2731 int dir
= qc
->dma_dir
;
2732 void *pad_buf
= NULL
;
2734 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
2735 WARN_ON(sg
== NULL
);
2737 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2738 WARN_ON(qc
->n_elem
> 1);
2740 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2742 /* if we padded the buffer out to 32-bit bound, and data
2743 * xfer direction is from-device, we must copy from the
2744 * pad buffer back into the supplied buffer
2746 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2747 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2749 if (qc
->flags
& ATA_QCFLAG_SG
) {
2751 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2752 /* restore last sg */
2753 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2755 struct scatterlist
*psg
= &qc
->pad_sgent
;
2756 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2757 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2758 kunmap_atomic(addr
, KM_IRQ0
);
2762 dma_unmap_single(ap
->host_set
->dev
,
2763 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2766 sg
->length
+= qc
->pad_len
;
2768 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2769 pad_buf
, qc
->pad_len
);
2772 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2777 * ata_fill_sg - Fill PCI IDE PRD table
2778 * @qc: Metadata associated with taskfile to be transferred
2780 * Fill PCI IDE PRD (scatter-gather) table with segments
2781 * associated with the current disk command.
2784 * spin_lock_irqsave(host_set lock)
2787 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2789 struct ata_port
*ap
= qc
->ap
;
2790 struct scatterlist
*sg
;
2793 WARN_ON(qc
->__sg
== NULL
);
2794 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
2797 ata_for_each_sg(sg
, qc
) {
2801 /* determine if physical DMA addr spans 64K boundary.
2802 * Note h/w doesn't support 64-bit, so we unconditionally
2803 * truncate dma_addr_t to u32.
2805 addr
= (u32
) sg_dma_address(sg
);
2806 sg_len
= sg_dma_len(sg
);
2809 offset
= addr
& 0xffff;
2811 if ((offset
+ sg_len
) > 0x10000)
2812 len
= 0x10000 - offset
;
2814 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2815 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2816 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2825 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2828 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2829 * @qc: Metadata associated with taskfile to check
2831 * Allow low-level driver to filter ATA PACKET commands, returning
2832 * a status indicating whether or not it is OK to use DMA for the
2833 * supplied PACKET command.
2836 * spin_lock_irqsave(host_set lock)
2838 * RETURNS: 0 when ATAPI DMA can be used
2841 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2843 struct ata_port
*ap
= qc
->ap
;
2844 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2846 if (ap
->ops
->check_atapi_dma
)
2847 rc
= ap
->ops
->check_atapi_dma(qc
);
2852 * ata_qc_prep - Prepare taskfile for submission
2853 * @qc: Metadata associated with taskfile to be prepared
2855 * Prepare ATA taskfile for submission.
2858 * spin_lock_irqsave(host_set lock)
2860 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2862 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2868 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
2871 * ata_sg_init_one - Associate command with memory buffer
2872 * @qc: Command to be associated
2873 * @buf: Memory buffer
2874 * @buflen: Length of memory buffer, in bytes.
2876 * Initialize the data-related elements of queued_cmd @qc
2877 * to point to a single memory buffer, @buf of byte length @buflen.
2880 * spin_lock_irqsave(host_set lock)
2883 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2885 struct scatterlist
*sg
;
2887 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2889 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2890 qc
->__sg
= &qc
->sgent
;
2892 qc
->orig_n_elem
= 1;
2896 sg_init_one(sg
, buf
, buflen
);
2900 * ata_sg_init - Associate command with scatter-gather table.
2901 * @qc: Command to be associated
2902 * @sg: Scatter-gather table.
2903 * @n_elem: Number of elements in s/g table.
2905 * Initialize the data-related elements of queued_cmd @qc
2906 * to point to a scatter-gather table @sg, containing @n_elem
2910 * spin_lock_irqsave(host_set lock)
2913 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2914 unsigned int n_elem
)
2916 qc
->flags
|= ATA_QCFLAG_SG
;
2918 qc
->n_elem
= n_elem
;
2919 qc
->orig_n_elem
= n_elem
;
2923 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2924 * @qc: Command with memory buffer to be mapped.
2926 * DMA-map the memory buffer associated with queued_cmd @qc.
2929 * spin_lock_irqsave(host_set lock)
2932 * Zero on success, negative on error.
2935 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2937 struct ata_port
*ap
= qc
->ap
;
2938 int dir
= qc
->dma_dir
;
2939 struct scatterlist
*sg
= qc
->__sg
;
2940 dma_addr_t dma_address
;
2943 /* we must lengthen transfers to end on a 32-bit boundary */
2944 qc
->pad_len
= sg
->length
& 3;
2946 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2947 struct scatterlist
*psg
= &qc
->pad_sgent
;
2949 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2951 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2953 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2954 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2957 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2958 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2960 sg
->length
-= qc
->pad_len
;
2961 if (sg
->length
== 0)
2964 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2965 sg
->length
, qc
->pad_len
);
2973 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2975 if (dma_mapping_error(dma_address
)) {
2977 sg
->length
+= qc
->pad_len
;
2981 sg_dma_address(sg
) = dma_address
;
2982 sg_dma_len(sg
) = sg
->length
;
2985 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2986 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2992 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2993 * @qc: Command with scatter-gather table to be mapped.
2995 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2998 * spin_lock_irqsave(host_set lock)
3001 * Zero on success, negative on error.
3005 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3007 struct ata_port
*ap
= qc
->ap
;
3008 struct scatterlist
*sg
= qc
->__sg
;
3009 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3010 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3012 VPRINTK("ENTER, ata%u\n", ap
->id
);
3013 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3015 /* we must lengthen transfers to end on a 32-bit boundary */
3016 qc
->pad_len
= lsg
->length
& 3;
3018 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3019 struct scatterlist
*psg
= &qc
->pad_sgent
;
3020 unsigned int offset
;
3022 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3024 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3027 * psg->page/offset are used to copy to-be-written
3028 * data in this function or read data in ata_sg_clean.
3030 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3031 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3032 psg
->offset
= offset_in_page(offset
);
3034 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3035 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3036 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3037 kunmap_atomic(addr
, KM_IRQ0
);
3040 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3041 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3043 lsg
->length
-= qc
->pad_len
;
3044 if (lsg
->length
== 0)
3047 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3048 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3051 pre_n_elem
= qc
->n_elem
;
3052 if (trim_sg
&& pre_n_elem
)
3061 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
3063 /* restore last sg */
3064 lsg
->length
+= qc
->pad_len
;
3068 DPRINTK("%d sg elements mapped\n", n_elem
);
3071 qc
->n_elem
= n_elem
;
3077 * ata_poll_qc_complete - turn irq back on and finish qc
3078 * @qc: Command to complete
3079 * @err_mask: ATA status register content
3082 * None. (grabs host lock)
3085 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3087 struct ata_port
*ap
= qc
->ap
;
3088 unsigned long flags
;
3090 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3091 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3093 ata_qc_complete(qc
);
3094 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3098 * ata_pio_poll - poll using PIO, depending on current state
3099 * @ap: the target ata_port
3102 * None. (executing in kernel thread context)
3105 * timeout value to use
3108 static unsigned long ata_pio_poll(struct ata_port
*ap
)
3110 struct ata_queued_cmd
*qc
;
3112 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3113 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3115 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3116 WARN_ON(qc
== NULL
);
3118 switch (ap
->hsm_task_state
) {
3121 poll_state
= HSM_ST_POLL
;
3125 case HSM_ST_LAST_POLL
:
3126 poll_state
= HSM_ST_LAST_POLL
;
3127 reg_state
= HSM_ST_LAST
;
3134 status
= ata_chk_status(ap
);
3135 if (status
& ATA_BUSY
) {
3136 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3137 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3138 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3141 ap
->hsm_task_state
= poll_state
;
3142 return ATA_SHORT_PAUSE
;
3145 ap
->hsm_task_state
= reg_state
;
3150 * ata_pio_complete - check if drive is busy or idle
3151 * @ap: the target ata_port
3154 * None. (executing in kernel thread context)
3157 * Non-zero if qc completed, zero otherwise.
3160 static int ata_pio_complete (struct ata_port
*ap
)
3162 struct ata_queued_cmd
*qc
;
3166 * This is purely heuristic. This is a fast path. Sometimes when
3167 * we enter, BSY will be cleared in a chk-status or two. If not,
3168 * the drive is probably seeking or something. Snooze for a couple
3169 * msecs, then chk-status again. If still busy, fall back to
3170 * HSM_ST_POLL state.
3172 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3173 if (drv_stat
& ATA_BUSY
) {
3175 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3176 if (drv_stat
& ATA_BUSY
) {
3177 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3178 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3183 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3184 WARN_ON(qc
== NULL
);
3186 drv_stat
= ata_wait_idle(ap
);
3187 if (!ata_ok(drv_stat
)) {
3188 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3189 ap
->hsm_task_state
= HSM_ST_ERR
;
3193 ap
->hsm_task_state
= HSM_ST_IDLE
;
3195 WARN_ON(qc
->err_mask
);
3196 ata_poll_qc_complete(qc
);
3198 /* another command may start at this point */
3205 * swap_buf_le16 - swap halves of 16-bit words in place
3206 * @buf: Buffer to swap
3207 * @buf_words: Number of 16-bit words in buffer.
3209 * Swap halves of 16-bit words if needed to convert from
3210 * little-endian byte order to native cpu byte order, or
3214 * Inherited from caller.
3216 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3221 for (i
= 0; i
< buf_words
; i
++)
3222 buf
[i
] = le16_to_cpu(buf
[i
]);
3223 #endif /* __BIG_ENDIAN */
3227 * ata_mmio_data_xfer - Transfer data by MMIO
3228 * @ap: port to read/write
3230 * @buflen: buffer length
3231 * @write_data: read/write
3233 * Transfer data from/to the device data register by MMIO.
3236 * Inherited from caller.
3239 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3240 unsigned int buflen
, int write_data
)
3243 unsigned int words
= buflen
>> 1;
3244 u16
*buf16
= (u16
*) buf
;
3245 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3247 /* Transfer multiple of 2 bytes */
3249 for (i
= 0; i
< words
; i
++)
3250 writew(le16_to_cpu(buf16
[i
]), mmio
);
3252 for (i
= 0; i
< words
; i
++)
3253 buf16
[i
] = cpu_to_le16(readw(mmio
));
3256 /* Transfer trailing 1 byte, if any. */
3257 if (unlikely(buflen
& 0x01)) {
3258 u16 align_buf
[1] = { 0 };
3259 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3262 memcpy(align_buf
, trailing_buf
, 1);
3263 writew(le16_to_cpu(align_buf
[0]), mmio
);
3265 align_buf
[0] = cpu_to_le16(readw(mmio
));
3266 memcpy(trailing_buf
, align_buf
, 1);
3272 * ata_pio_data_xfer - Transfer data by PIO
3273 * @ap: port to read/write
3275 * @buflen: buffer length
3276 * @write_data: read/write
3278 * Transfer data from/to the device data register by PIO.
3281 * Inherited from caller.
3284 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3285 unsigned int buflen
, int write_data
)
3287 unsigned int words
= buflen
>> 1;
3289 /* Transfer multiple of 2 bytes */
3291 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3293 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3295 /* Transfer trailing 1 byte, if any. */
3296 if (unlikely(buflen
& 0x01)) {
3297 u16 align_buf
[1] = { 0 };
3298 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3301 memcpy(align_buf
, trailing_buf
, 1);
3302 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3304 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3305 memcpy(trailing_buf
, align_buf
, 1);
3311 * ata_data_xfer - Transfer data from/to the data register.
3312 * @ap: port to read/write
3314 * @buflen: buffer length
3315 * @do_write: read/write
3317 * Transfer data from/to the device data register.
3320 * Inherited from caller.
3323 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3324 unsigned int buflen
, int do_write
)
3326 /* Make the crap hardware pay the costs not the good stuff */
3327 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3328 unsigned long flags
;
3329 local_irq_save(flags
);
3330 if (ap
->flags
& ATA_FLAG_MMIO
)
3331 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3333 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3334 local_irq_restore(flags
);
3336 if (ap
->flags
& ATA_FLAG_MMIO
)
3337 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3339 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3344 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3345 * @qc: Command on going
3347 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3350 * Inherited from caller.
3353 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3355 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3356 struct scatterlist
*sg
= qc
->__sg
;
3357 struct ata_port
*ap
= qc
->ap
;
3359 unsigned int offset
;
3362 if (qc
->cursect
== (qc
->nsect
- 1))
3363 ap
->hsm_task_state
= HSM_ST_LAST
;
3365 page
= sg
[qc
->cursg
].page
;
3366 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3368 /* get the current page and offset */
3369 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3370 offset
%= PAGE_SIZE
;
3372 buf
= kmap(page
) + offset
;
3377 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3382 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3384 /* do the actual data transfer */
3385 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3386 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3392 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3393 * @qc: Command on going
3394 * @bytes: number of bytes
3396 * Transfer Transfer data from/to the ATAPI device.
3399 * Inherited from caller.
3403 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3405 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3406 struct scatterlist
*sg
= qc
->__sg
;
3407 struct ata_port
*ap
= qc
->ap
;
3410 unsigned int offset
, count
;
3412 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3413 ap
->hsm_task_state
= HSM_ST_LAST
;
3416 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3418 * The end of qc->sg is reached and the device expects
3419 * more data to transfer. In order not to overrun qc->sg
3420 * and fulfill length specified in the byte count register,
3421 * - for read case, discard trailing data from the device
3422 * - for write case, padding zero data to the device
3424 u16 pad_buf
[1] = { 0 };
3425 unsigned int words
= bytes
>> 1;
3428 if (words
) /* warning if bytes > 1 */
3429 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3432 for (i
= 0; i
< words
; i
++)
3433 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3435 ap
->hsm_task_state
= HSM_ST_LAST
;
3439 sg
= &qc
->__sg
[qc
->cursg
];
3442 offset
= sg
->offset
+ qc
->cursg_ofs
;
3444 /* get the current page and offset */
3445 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3446 offset
%= PAGE_SIZE
;
3448 /* don't overrun current sg */
3449 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3451 /* don't cross page boundaries */
3452 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3454 buf
= kmap(page
) + offset
;
3457 qc
->curbytes
+= count
;
3458 qc
->cursg_ofs
+= count
;
3460 if (qc
->cursg_ofs
== sg
->length
) {
3465 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3467 /* do the actual data transfer */
3468 ata_data_xfer(ap
, buf
, count
, do_write
);
3477 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3478 * @qc: Command on going
3480 * Transfer Transfer data from/to the ATAPI device.
3483 * Inherited from caller.
3486 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3488 struct ata_port
*ap
= qc
->ap
;
3489 struct ata_device
*dev
= qc
->dev
;
3490 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3491 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3493 ap
->ops
->tf_read(ap
, &qc
->tf
);
3494 ireason
= qc
->tf
.nsect
;
3495 bc_lo
= qc
->tf
.lbam
;
3496 bc_hi
= qc
->tf
.lbah
;
3497 bytes
= (bc_hi
<< 8) | bc_lo
;
3499 /* shall be cleared to zero, indicating xfer of data */
3500 if (ireason
& (1 << 0))
3503 /* make sure transfer direction matches expected */
3504 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3505 if (do_write
!= i_write
)
3508 __atapi_pio_bytes(qc
, bytes
);
3513 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3514 ap
->id
, dev
->devno
);
3515 qc
->err_mask
|= AC_ERR_HSM
;
3516 ap
->hsm_task_state
= HSM_ST_ERR
;
3520 * ata_pio_block - start PIO on a block
3521 * @ap: the target ata_port
3524 * None. (executing in kernel thread context)
3527 static void ata_pio_block(struct ata_port
*ap
)
3529 struct ata_queued_cmd
*qc
;
3533 * This is purely heuristic. This is a fast path.
3534 * Sometimes when we enter, BSY will be cleared in
3535 * a chk-status or two. If not, the drive is probably seeking
3536 * or something. Snooze for a couple msecs, then
3537 * chk-status again. If still busy, fall back to
3538 * HSM_ST_POLL state.
3540 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3541 if (status
& ATA_BUSY
) {
3543 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3544 if (status
& ATA_BUSY
) {
3545 ap
->hsm_task_state
= HSM_ST_POLL
;
3546 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3551 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3552 WARN_ON(qc
== NULL
);
3555 if (status
& (ATA_ERR
| ATA_DF
)) {
3556 qc
->err_mask
|= AC_ERR_DEV
;
3557 ap
->hsm_task_state
= HSM_ST_ERR
;
3561 /* transfer data if any */
3562 if (is_atapi_taskfile(&qc
->tf
)) {
3563 /* DRQ=0 means no more data to transfer */
3564 if ((status
& ATA_DRQ
) == 0) {
3565 ap
->hsm_task_state
= HSM_ST_LAST
;
3569 atapi_pio_bytes(qc
);
3571 /* handle BSY=0, DRQ=0 as error */
3572 if ((status
& ATA_DRQ
) == 0) {
3573 qc
->err_mask
|= AC_ERR_HSM
;
3574 ap
->hsm_task_state
= HSM_ST_ERR
;
3582 static void ata_pio_error(struct ata_port
*ap
)
3584 struct ata_queued_cmd
*qc
;
3586 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3587 WARN_ON(qc
== NULL
);
3589 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3590 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3592 /* make sure qc->err_mask is available to
3593 * know what's wrong and recover
3595 WARN_ON(qc
->err_mask
== 0);
3597 ap
->hsm_task_state
= HSM_ST_IDLE
;
3599 ata_poll_qc_complete(qc
);
3602 static void ata_pio_task(void *_data
)
3604 struct ata_port
*ap
= _data
;
3605 unsigned long timeout
;
3612 switch (ap
->hsm_task_state
) {
3621 qc_completed
= ata_pio_complete(ap
);
3625 case HSM_ST_LAST_POLL
:
3626 timeout
= ata_pio_poll(ap
);
3636 ata_port_queue_task(ap
, ata_pio_task
, ap
, timeout
);
3637 else if (!qc_completed
)
3642 * atapi_packet_task - Write CDB bytes to hardware
3643 * @_data: Port to which ATAPI device is attached.
3645 * When device has indicated its readiness to accept
3646 * a CDB, this function is called. Send the CDB.
3647 * If DMA is to be performed, exit immediately.
3648 * Otherwise, we are in polling mode, so poll
3649 * status under operation succeeds or fails.
3652 * Kernel thread context (may sleep)
3655 static void atapi_packet_task(void *_data
)
3657 struct ata_port
*ap
= _data
;
3658 struct ata_queued_cmd
*qc
;
3661 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3662 WARN_ON(qc
== NULL
);
3663 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3665 /* sleep-wait for BSY to clear */
3666 DPRINTK("busy wait\n");
3667 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3668 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3672 /* make sure DRQ is set */
3673 status
= ata_chk_status(ap
);
3674 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3675 qc
->err_mask
|= AC_ERR_HSM
;
3680 DPRINTK("send cdb\n");
3681 WARN_ON(qc
->dev
->cdb_len
< 12);
3683 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
3684 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
3685 unsigned long flags
;
3687 /* Once we're done issuing command and kicking bmdma,
3688 * irq handler takes over. To not lose irq, we need
3689 * to clear NOINTR flag before sending cdb, but
3690 * interrupt handler shouldn't be invoked before we're
3691 * finished. Hence, the following locking.
3693 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3694 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3695 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3696 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
3697 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3698 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3700 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3702 /* PIO commands are handled by polling */
3703 ap
->hsm_task_state
= HSM_ST
;
3704 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
3710 ata_poll_qc_complete(qc
);
3714 * ata_qc_timeout - Handle timeout of queued command
3715 * @qc: Command that timed out
3717 * Some part of the kernel (currently, only the SCSI layer)
3718 * has noticed that the active command on port @ap has not
3719 * completed after a specified length of time. Handle this
3720 * condition by disabling DMA (if necessary) and completing
3721 * transactions, with error if necessary.
3723 * This also handles the case of the "lost interrupt", where
3724 * for some reason (possibly hardware bug, possibly driver bug)
3725 * an interrupt was not delivered to the driver, even though the
3726 * transaction completed successfully.
3729 * Inherited from SCSI layer (none, can sleep)
3732 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3734 struct ata_port
*ap
= qc
->ap
;
3735 struct ata_host_set
*host_set
= ap
->host_set
;
3736 u8 host_stat
= 0, drv_stat
;
3737 unsigned long flags
;
3741 ap
->hsm_task_state
= HSM_ST_IDLE
;
3743 spin_lock_irqsave(&host_set
->lock
, flags
);
3745 switch (qc
->tf
.protocol
) {
3748 case ATA_PROT_ATAPI_DMA
:
3749 host_stat
= ap
->ops
->bmdma_status(ap
);
3751 /* before we do anything else, clear DMA-Start bit */
3752 ap
->ops
->bmdma_stop(qc
);
3758 drv_stat
= ata_chk_status(ap
);
3760 /* ack bmdma irq events */
3761 ap
->ops
->irq_clear(ap
);
3763 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3764 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3766 /* complete taskfile transaction */
3767 qc
->err_mask
|= ac_err_mask(drv_stat
);
3771 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3773 ata_eh_qc_complete(qc
);
3779 * ata_eng_timeout - Handle timeout of queued command
3780 * @ap: Port on which timed-out command is active
3782 * Some part of the kernel (currently, only the SCSI layer)
3783 * has noticed that the active command on port @ap has not
3784 * completed after a specified length of time. Handle this
3785 * condition by disabling DMA (if necessary) and completing
3786 * transactions, with error if necessary.
3788 * This also handles the case of the "lost interrupt", where
3789 * for some reason (possibly hardware bug, possibly driver bug)
3790 * an interrupt was not delivered to the driver, even though the
3791 * transaction completed successfully.
3794 * Inherited from SCSI layer (none, can sleep)
3797 void ata_eng_timeout(struct ata_port
*ap
)
3801 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
3807 * ata_qc_new - Request an available ATA command, for queueing
3808 * @ap: Port associated with device @dev
3809 * @dev: Device from whom we request an available command structure
3815 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3817 struct ata_queued_cmd
*qc
= NULL
;
3820 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3821 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3822 qc
= ata_qc_from_tag(ap
, i
);
3833 * ata_qc_new_init - Request an available ATA command, and initialize it
3834 * @ap: Port associated with device @dev
3835 * @dev: Device from whom we request an available command structure
3841 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3842 struct ata_device
*dev
)
3844 struct ata_queued_cmd
*qc
;
3846 qc
= ata_qc_new(ap
);
3859 * ata_qc_free - free unused ata_queued_cmd
3860 * @qc: Command to complete
3862 * Designed to free unused ata_queued_cmd object
3863 * in case something prevents using it.
3866 * spin_lock_irqsave(host_set lock)
3868 void ata_qc_free(struct ata_queued_cmd
*qc
)
3870 struct ata_port
*ap
= qc
->ap
;
3873 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3877 if (likely(ata_tag_valid(tag
))) {
3878 if (tag
== ap
->active_tag
)
3879 ap
->active_tag
= ATA_TAG_POISON
;
3880 qc
->tag
= ATA_TAG_POISON
;
3881 clear_bit(tag
, &ap
->qactive
);
3885 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3887 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
3888 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3890 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3893 /* atapi: mark qc as inactive to prevent the interrupt handler
3894 * from completing the command twice later, before the error handler
3895 * is called. (when rc != 0 and atapi request sense is needed)
3897 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3899 /* call completion callback */
3900 qc
->complete_fn(qc
);
3903 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3905 struct ata_port
*ap
= qc
->ap
;
3907 switch (qc
->tf
.protocol
) {
3909 case ATA_PROT_ATAPI_DMA
:
3912 case ATA_PROT_ATAPI
:
3914 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3927 * ata_qc_issue - issue taskfile to device
3928 * @qc: command to issue to device
3930 * Prepare an ATA command to submission to device.
3931 * This includes mapping the data into a DMA-able
3932 * area, filling in the S/G table, and finally
3933 * writing the taskfile to hardware, starting the command.
3936 * spin_lock_irqsave(host_set lock)
3939 * Zero on success, AC_ERR_* mask on failure
3942 unsigned int ata_qc_issue(struct ata_queued_cmd
*qc
)
3944 struct ata_port
*ap
= qc
->ap
;
3946 if (ata_should_dma_map(qc
)) {
3947 if (qc
->flags
& ATA_QCFLAG_SG
) {
3948 if (ata_sg_setup(qc
))
3950 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3951 if (ata_sg_setup_one(qc
))
3955 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3958 ap
->ops
->qc_prep(qc
);
3960 qc
->ap
->active_tag
= qc
->tag
;
3961 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3963 return ap
->ops
->qc_issue(qc
);
3966 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3967 return AC_ERR_SYSTEM
;
3972 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3973 * @qc: command to issue to device
3975 * Using various libata functions and hooks, this function
3976 * starts an ATA command. ATA commands are grouped into
3977 * classes called "protocols", and issuing each type of protocol
3978 * is slightly different.
3980 * May be used as the qc_issue() entry in ata_port_operations.
3983 * spin_lock_irqsave(host_set lock)
3986 * Zero on success, AC_ERR_* mask on failure
3989 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3991 struct ata_port
*ap
= qc
->ap
;
3993 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3995 switch (qc
->tf
.protocol
) {
3996 case ATA_PROT_NODATA
:
3997 ata_tf_to_host(ap
, &qc
->tf
);
4001 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4002 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4003 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4006 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4007 ata_qc_set_polling(qc
);
4008 ata_tf_to_host(ap
, &qc
->tf
);
4009 ap
->hsm_task_state
= HSM_ST
;
4010 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4013 case ATA_PROT_ATAPI
:
4014 ata_qc_set_polling(qc
);
4015 ata_tf_to_host(ap
, &qc
->tf
);
4016 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4019 case ATA_PROT_ATAPI_NODATA
:
4020 ap
->flags
|= ATA_FLAG_NOINTR
;
4021 ata_tf_to_host(ap
, &qc
->tf
);
4022 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4025 case ATA_PROT_ATAPI_DMA
:
4026 ap
->flags
|= ATA_FLAG_NOINTR
;
4027 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4028 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4029 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4034 return AC_ERR_SYSTEM
;
4041 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
4042 * @qc: Info associated with this ATA transaction.
4045 * spin_lock_irqsave(host_set lock)
4048 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
4050 struct ata_port
*ap
= qc
->ap
;
4051 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
4053 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4055 /* load PRD table addr. */
4056 mb(); /* make sure PRD table writes are visible to controller */
4057 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
4059 /* specify data direction, triple-check start bit is clear */
4060 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
4061 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
4063 dmactl
|= ATA_DMA_WR
;
4064 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
4066 /* issue r/w command */
4067 ap
->ops
->exec_command(ap
, &qc
->tf
);
4071 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
4072 * @qc: Info associated with this ATA transaction.
4075 * spin_lock_irqsave(host_set lock)
4078 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
4080 struct ata_port
*ap
= qc
->ap
;
4081 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4084 /* start host DMA transaction */
4085 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
4086 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
4088 /* Strictly, one may wish to issue a readb() here, to
4089 * flush the mmio write. However, control also passes
4090 * to the hardware at this point, and it will interrupt
4091 * us when we are to resume control. So, in effect,
4092 * we don't care when the mmio write flushes.
4093 * Further, a read of the DMA status register _immediately_
4094 * following the write may not be what certain flaky hardware
4095 * is expected, so I think it is best to not add a readb()
4096 * without first all the MMIO ATA cards/mobos.
4097 * Or maybe I'm just being paranoid.
4102 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
4103 * @qc: Info associated with this ATA transaction.
4106 * spin_lock_irqsave(host_set lock)
4109 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
4111 struct ata_port
*ap
= qc
->ap
;
4112 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
4115 /* load PRD table addr. */
4116 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
4118 /* specify data direction, triple-check start bit is clear */
4119 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4120 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
4122 dmactl
|= ATA_DMA_WR
;
4123 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4125 /* issue r/w command */
4126 ap
->ops
->exec_command(ap
, &qc
->tf
);
4130 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
4131 * @qc: Info associated with this ATA transaction.
4134 * spin_lock_irqsave(host_set lock)
4137 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
4139 struct ata_port
*ap
= qc
->ap
;
4142 /* start host DMA transaction */
4143 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4144 outb(dmactl
| ATA_DMA_START
,
4145 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4150 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
4151 * @qc: Info associated with this ATA transaction.
4153 * Writes the ATA_DMA_START flag to the DMA command register.
4155 * May be used as the bmdma_start() entry in ata_port_operations.
4158 * spin_lock_irqsave(host_set lock)
4160 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
4162 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4163 ata_bmdma_start_mmio(qc
);
4165 ata_bmdma_start_pio(qc
);
4170 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
4171 * @qc: Info associated with this ATA transaction.
4173 * Writes address of PRD table to device's PRD Table Address
4174 * register, sets the DMA control register, and calls
4175 * ops->exec_command() to start the transfer.
4177 * May be used as the bmdma_setup() entry in ata_port_operations.
4180 * spin_lock_irqsave(host_set lock)
4182 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
4184 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4185 ata_bmdma_setup_mmio(qc
);
4187 ata_bmdma_setup_pio(qc
);
4192 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
4193 * @ap: Port associated with this ATA transaction.
4195 * Clear interrupt and error flags in DMA status register.
4197 * May be used as the irq_clear() entry in ata_port_operations.
4200 * spin_lock_irqsave(host_set lock)
4203 void ata_bmdma_irq_clear(struct ata_port
*ap
)
4205 if (ap
->flags
& ATA_FLAG_MMIO
) {
4206 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
4207 writeb(readb(mmio
), mmio
);
4209 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
4210 outb(inb(addr
), addr
);
4217 * ata_bmdma_status - Read PCI IDE BMDMA status
4218 * @ap: Port associated with this ATA transaction.
4220 * Read and return BMDMA status register.
4222 * May be used as the bmdma_status() entry in ata_port_operations.
4225 * spin_lock_irqsave(host_set lock)
4228 u8
ata_bmdma_status(struct ata_port
*ap
)
4231 if (ap
->flags
& ATA_FLAG_MMIO
) {
4232 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4233 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
4235 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
4241 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4242 * @qc: Command we are ending DMA for
4244 * Clears the ATA_DMA_START flag in the dma control register
4246 * May be used as the bmdma_stop() entry in ata_port_operations.
4249 * spin_lock_irqsave(host_set lock)
4252 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
4254 struct ata_port
*ap
= qc
->ap
;
4255 if (ap
->flags
& ATA_FLAG_MMIO
) {
4256 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4258 /* clear start/stop bit */
4259 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4260 mmio
+ ATA_DMA_CMD
);
4262 /* clear start/stop bit */
4263 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4264 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4267 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4268 ata_altstatus(ap
); /* dummy read */
4272 * ata_host_intr - Handle host interrupt for given (port, task)
4273 * @ap: Port on which interrupt arrived (possibly...)
4274 * @qc: Taskfile currently active in engine
4276 * Handle host interrupt for given queued command. Currently,
4277 * only DMA interrupts are handled. All other commands are
4278 * handled via polling with interrupts disabled (nIEN bit).
4281 * spin_lock_irqsave(host_set lock)
4284 * One if interrupt was handled, zero if not (shared irq).
4287 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4288 struct ata_queued_cmd
*qc
)
4290 u8 status
, host_stat
;
4292 switch (qc
->tf
.protocol
) {
4295 case ATA_PROT_ATAPI_DMA
:
4296 case ATA_PROT_ATAPI
:
4297 /* check status of DMA engine */
4298 host_stat
= ap
->ops
->bmdma_status(ap
);
4299 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4301 /* if it's not our irq... */
4302 if (!(host_stat
& ATA_DMA_INTR
))
4305 /* before we do anything else, clear DMA-Start bit */
4306 ap
->ops
->bmdma_stop(qc
);
4310 case ATA_PROT_ATAPI_NODATA
:
4311 case ATA_PROT_NODATA
:
4312 /* check altstatus */
4313 status
= ata_altstatus(ap
);
4314 if (status
& ATA_BUSY
)
4317 /* check main status, clearing INTRQ */
4318 status
= ata_chk_status(ap
);
4319 if (unlikely(status
& ATA_BUSY
))
4321 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4322 ap
->id
, qc
->tf
.protocol
, status
);
4324 /* ack bmdma irq events */
4325 ap
->ops
->irq_clear(ap
);
4327 /* complete taskfile transaction */
4328 qc
->err_mask
|= ac_err_mask(status
);
4329 ata_qc_complete(qc
);
4336 return 1; /* irq handled */
4339 ap
->stats
.idle_irq
++;
4342 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4344 ata_irq_ack(ap
, 0); /* debug trap */
4345 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4348 return 0; /* irq not handled */
4352 * ata_interrupt - Default ATA host interrupt handler
4353 * @irq: irq line (unused)
4354 * @dev_instance: pointer to our ata_host_set information structure
4357 * Default interrupt handler for PCI IDE devices. Calls
4358 * ata_host_intr() for each port that is not disabled.
4361 * Obtains host_set lock during operation.
4364 * IRQ_NONE or IRQ_HANDLED.
4367 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4369 struct ata_host_set
*host_set
= dev_instance
;
4371 unsigned int handled
= 0;
4372 unsigned long flags
;
4374 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4375 spin_lock_irqsave(&host_set
->lock
, flags
);
4377 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4378 struct ata_port
*ap
;
4380 ap
= host_set
->ports
[i
];
4382 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4383 struct ata_queued_cmd
*qc
;
4385 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4386 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4387 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4388 handled
|= ata_host_intr(ap
, qc
);
4392 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4394 return IRQ_RETVAL(handled
);
4399 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4400 * without filling any other registers
4402 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4405 struct ata_taskfile tf
;
4408 ata_tf_init(ap
, &tf
, dev
->devno
);
4411 tf
.flags
|= ATA_TFLAG_DEVICE
;
4412 tf
.protocol
= ATA_PROT_NODATA
;
4414 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4416 printk(KERN_ERR
"%s: ata command failed: %d\n",
4422 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4426 if (!ata_try_flush_cache(dev
))
4429 if (ata_id_has_flush_ext(dev
->id
))
4430 cmd
= ATA_CMD_FLUSH_EXT
;
4432 cmd
= ATA_CMD_FLUSH
;
4434 return ata_do_simple_cmd(ap
, dev
, cmd
);
4437 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4439 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4442 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4444 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4448 * ata_device_resume - wakeup a previously suspended devices
4449 * @ap: port the device is connected to
4450 * @dev: the device to resume
4452 * Kick the drive back into action, by sending it an idle immediate
4453 * command and making sure its transfer mode matches between drive
4457 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4459 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4460 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4463 if (!ata_dev_present(dev
))
4465 if (dev
->class == ATA_DEV_ATA
)
4466 ata_start_drive(ap
, dev
);
4472 * ata_device_suspend - prepare a device for suspend
4473 * @ap: port the device is connected to
4474 * @dev: the device to suspend
4476 * Flush the cache on the drive, if appropriate, then issue a
4477 * standbynow command.
4479 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4481 if (!ata_dev_present(dev
))
4483 if (dev
->class == ATA_DEV_ATA
)
4484 ata_flush_cache(ap
, dev
);
4486 ata_standby_drive(ap
, dev
);
4487 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4492 * ata_port_start - Set port up for dma.
4493 * @ap: Port to initialize
4495 * Called just after data structures for each port are
4496 * initialized. Allocates space for PRD table.
4498 * May be used as the port_start() entry in ata_port_operations.
4501 * Inherited from caller.
4504 int ata_port_start (struct ata_port
*ap
)
4506 struct device
*dev
= ap
->host_set
->dev
;
4509 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4513 rc
= ata_pad_alloc(ap
, dev
);
4515 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4519 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4526 * ata_port_stop - Undo ata_port_start()
4527 * @ap: Port to shut down
4529 * Frees the PRD table.
4531 * May be used as the port_stop() entry in ata_port_operations.
4534 * Inherited from caller.
4537 void ata_port_stop (struct ata_port
*ap
)
4539 struct device
*dev
= ap
->host_set
->dev
;
4541 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4542 ata_pad_free(ap
, dev
);
4545 void ata_host_stop (struct ata_host_set
*host_set
)
4547 if (host_set
->mmio_base
)
4548 iounmap(host_set
->mmio_base
);
4553 * ata_host_remove - Unregister SCSI host structure with upper layers
4554 * @ap: Port to unregister
4555 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4558 * Inherited from caller.
4561 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4563 struct Scsi_Host
*sh
= ap
->host
;
4568 scsi_remove_host(sh
);
4570 ap
->ops
->port_stop(ap
);
4574 * ata_host_init - Initialize an ata_port structure
4575 * @ap: Structure to initialize
4576 * @host: associated SCSI mid-layer structure
4577 * @host_set: Collection of hosts to which @ap belongs
4578 * @ent: Probe information provided by low-level driver
4579 * @port_no: Port number associated with this ata_port
4581 * Initialize a new ata_port structure, and its associated
4585 * Inherited from caller.
4588 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4589 struct ata_host_set
*host_set
,
4590 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4596 host
->max_channel
= 1;
4597 host
->unique_id
= ata_unique_id
++;
4598 host
->max_cmd_len
= 12;
4600 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4601 ap
->id
= host
->unique_id
;
4603 ap
->ctl
= ATA_DEVCTL_OBS
;
4604 ap
->host_set
= host_set
;
4605 ap
->port_no
= port_no
;
4607 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4608 ap
->pio_mask
= ent
->pio_mask
;
4609 ap
->mwdma_mask
= ent
->mwdma_mask
;
4610 ap
->udma_mask
= ent
->udma_mask
;
4611 ap
->flags
|= ent
->host_flags
;
4612 ap
->ops
= ent
->port_ops
;
4613 ap
->cbl
= ATA_CBL_NONE
;
4614 ap
->active_tag
= ATA_TAG_POISON
;
4615 ap
->last_ctl
= 0xFF;
4617 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4618 INIT_LIST_HEAD(&ap
->eh_done_q
);
4620 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4621 ap
->device
[i
].devno
= i
;
4624 ap
->stats
.unhandled_irq
= 1;
4625 ap
->stats
.idle_irq
= 1;
4628 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4632 * ata_host_add - Attach low-level ATA driver to system
4633 * @ent: Information provided by low-level driver
4634 * @host_set: Collections of ports to which we add
4635 * @port_no: Port number associated with this host
4637 * Attach low-level ATA driver to system.
4640 * PCI/etc. bus probe sem.
4643 * New ata_port on success, for NULL on error.
4646 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4647 struct ata_host_set
*host_set
,
4648 unsigned int port_no
)
4650 struct Scsi_Host
*host
;
4651 struct ata_port
*ap
;
4655 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4659 ap
= (struct ata_port
*) &host
->hostdata
[0];
4661 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4663 rc
= ap
->ops
->port_start(ap
);
4670 scsi_host_put(host
);
4675 * ata_device_add - Register hardware device with ATA and SCSI layers
4676 * @ent: Probe information describing hardware device to be registered
4678 * This function processes the information provided in the probe
4679 * information struct @ent, allocates the necessary ATA and SCSI
4680 * host information structures, initializes them, and registers
4681 * everything with requisite kernel subsystems.
4683 * This function requests irqs, probes the ATA bus, and probes
4687 * PCI/etc. bus probe sem.
4690 * Number of ports registered. Zero on error (no ports registered).
4693 int ata_device_add(const struct ata_probe_ent
*ent
)
4695 unsigned int count
= 0, i
;
4696 struct device
*dev
= ent
->dev
;
4697 struct ata_host_set
*host_set
;
4700 /* alloc a container for our list of ATA ports (buses) */
4701 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4702 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4705 spin_lock_init(&host_set
->lock
);
4707 host_set
->dev
= dev
;
4708 host_set
->n_ports
= ent
->n_ports
;
4709 host_set
->irq
= ent
->irq
;
4710 host_set
->mmio_base
= ent
->mmio_base
;
4711 host_set
->private_data
= ent
->private_data
;
4712 host_set
->ops
= ent
->port_ops
;
4714 /* register each port bound to this device */
4715 for (i
= 0; i
< ent
->n_ports
; i
++) {
4716 struct ata_port
*ap
;
4717 unsigned long xfer_mode_mask
;
4719 ap
= ata_host_add(ent
, host_set
, i
);
4723 host_set
->ports
[i
] = ap
;
4724 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4725 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4726 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4728 /* print per-port info to dmesg */
4729 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4730 "bmdma 0x%lX irq %lu\n",
4732 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4733 ata_mode_string(xfer_mode_mask
),
4734 ap
->ioaddr
.cmd_addr
,
4735 ap
->ioaddr
.ctl_addr
,
4736 ap
->ioaddr
.bmdma_addr
,
4740 host_set
->ops
->irq_clear(ap
);
4747 /* obtain irq, that is shared between channels */
4748 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4749 DRV_NAME
, host_set
))
4752 /* perform each probe synchronously */
4753 DPRINTK("probe begin\n");
4754 for (i
= 0; i
< count
; i
++) {
4755 struct ata_port
*ap
;
4758 ap
= host_set
->ports
[i
];
4760 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4761 rc
= ata_bus_probe(ap
);
4762 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4765 /* FIXME: do something useful here?
4766 * Current libata behavior will
4767 * tear down everything when
4768 * the module is removed
4769 * or the h/w is unplugged.
4773 rc
= scsi_add_host(ap
->host
, dev
);
4775 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4777 /* FIXME: do something useful here */
4778 /* FIXME: handle unconditional calls to
4779 * scsi_scan_host and ata_host_remove, below,
4785 /* probes are done, now scan each port's disk(s) */
4786 DPRINTK("host probe begin\n");
4787 for (i
= 0; i
< count
; i
++) {
4788 struct ata_port
*ap
= host_set
->ports
[i
];
4790 ata_scsi_scan_host(ap
);
4793 dev_set_drvdata(dev
, host_set
);
4795 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4796 return ent
->n_ports
; /* success */
4799 for (i
= 0; i
< count
; i
++) {
4800 ata_host_remove(host_set
->ports
[i
], 1);
4801 scsi_host_put(host_set
->ports
[i
]->host
);
4805 VPRINTK("EXIT, returning 0\n");
4810 * ata_host_set_remove - PCI layer callback for device removal
4811 * @host_set: ATA host set that was removed
4813 * Unregister all objects associated with this host set. Free those
4817 * Inherited from calling layer (may sleep).
4820 void ata_host_set_remove(struct ata_host_set
*host_set
)
4822 struct ata_port
*ap
;
4825 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4826 ap
= host_set
->ports
[i
];
4827 scsi_remove_host(ap
->host
);
4830 free_irq(host_set
->irq
, host_set
);
4832 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4833 ap
= host_set
->ports
[i
];
4835 ata_scsi_release(ap
->host
);
4837 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4838 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4840 if (ioaddr
->cmd_addr
== 0x1f0)
4841 release_region(0x1f0, 8);
4842 else if (ioaddr
->cmd_addr
== 0x170)
4843 release_region(0x170, 8);
4846 scsi_host_put(ap
->host
);
4849 if (host_set
->ops
->host_stop
)
4850 host_set
->ops
->host_stop(host_set
);
4856 * ata_scsi_release - SCSI layer callback hook for host unload
4857 * @host: libata host to be unloaded
4859 * Performs all duties necessary to shut down a libata port...
4860 * Kill port kthread, disable port, and release resources.
4863 * Inherited from SCSI layer.
4869 int ata_scsi_release(struct Scsi_Host
*host
)
4871 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4876 ap
->ops
->port_disable(ap
);
4877 ata_host_remove(ap
, 0);
4878 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4879 kfree(ap
->device
[i
].id
);
4886 * ata_std_ports - initialize ioaddr with standard port offsets.
4887 * @ioaddr: IO address structure to be initialized
4889 * Utility function which initializes data_addr, error_addr,
4890 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4891 * device_addr, status_addr, and command_addr to standard offsets
4892 * relative to cmd_addr.
4894 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4897 void ata_std_ports(struct ata_ioports
*ioaddr
)
4899 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4900 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4901 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4902 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4903 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4904 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4905 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4906 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4907 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4908 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4914 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4916 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4918 pci_iounmap(pdev
, host_set
->mmio_base
);
4922 * ata_pci_remove_one - PCI layer callback for device removal
4923 * @pdev: PCI device that was removed
4925 * PCI layer indicates to libata via this hook that
4926 * hot-unplug or module unload event has occurred.
4927 * Handle this by unregistering all objects associated
4928 * with this PCI device. Free those objects. Then finally
4929 * release PCI resources and disable device.
4932 * Inherited from PCI layer (may sleep).
4935 void ata_pci_remove_one (struct pci_dev
*pdev
)
4937 struct device
*dev
= pci_dev_to_dev(pdev
);
4938 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4940 ata_host_set_remove(host_set
);
4941 pci_release_regions(pdev
);
4942 pci_disable_device(pdev
);
4943 dev_set_drvdata(dev
, NULL
);
4946 /* move to PCI subsystem */
4947 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4949 unsigned long tmp
= 0;
4951 switch (bits
->width
) {
4954 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4960 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4966 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4977 return (tmp
== bits
->val
) ? 1 : 0;
4980 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4982 pci_save_state(pdev
);
4983 pci_disable_device(pdev
);
4984 pci_set_power_state(pdev
, PCI_D3hot
);
4988 int ata_pci_device_resume(struct pci_dev
*pdev
)
4990 pci_set_power_state(pdev
, PCI_D0
);
4991 pci_restore_state(pdev
);
4992 pci_enable_device(pdev
);
4993 pci_set_master(pdev
);
4996 #endif /* CONFIG_PCI */
4999 static int __init
ata_init(void)
5001 ata_wq
= create_workqueue("ata");
5005 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5009 static void __exit
ata_exit(void)
5011 destroy_workqueue(ata_wq
);
5014 module_init(ata_init
);
5015 module_exit(ata_exit
);
5017 static unsigned long ratelimit_time
;
5018 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5020 int ata_ratelimit(void)
5023 unsigned long flags
;
5025 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5027 if (time_after(jiffies
, ratelimit_time
)) {
5029 ratelimit_time
= jiffies
+ (HZ
/5);
5033 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5039 * libata is essentially a library of internal helper functions for
5040 * low-level ATA host controller drivers. As such, the API/ABI is
5041 * likely to change as new drivers are added and updated.
5042 * Do not depend on ABI/API stability.
5045 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5046 EXPORT_SYMBOL_GPL(ata_std_ports
);
5047 EXPORT_SYMBOL_GPL(ata_device_add
);
5048 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5049 EXPORT_SYMBOL_GPL(ata_sg_init
);
5050 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5051 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5052 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5053 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5054 EXPORT_SYMBOL_GPL(ata_tf_load
);
5055 EXPORT_SYMBOL_GPL(ata_tf_read
);
5056 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5057 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5058 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5059 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5060 EXPORT_SYMBOL_GPL(ata_check_status
);
5061 EXPORT_SYMBOL_GPL(ata_altstatus
);
5062 EXPORT_SYMBOL_GPL(ata_exec_command
);
5063 EXPORT_SYMBOL_GPL(ata_port_start
);
5064 EXPORT_SYMBOL_GPL(ata_port_stop
);
5065 EXPORT_SYMBOL_GPL(ata_host_stop
);
5066 EXPORT_SYMBOL_GPL(ata_interrupt
);
5067 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5068 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5069 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5070 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5071 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5072 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5073 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5074 EXPORT_SYMBOL_GPL(ata_port_probe
);
5075 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5076 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5077 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5078 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5079 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5080 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5081 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5082 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5083 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5084 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5085 EXPORT_SYMBOL_GPL(ata_port_disable
);
5086 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5087 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5088 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5089 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5090 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5091 EXPORT_SYMBOL_GPL(ata_scsi_timed_out
);
5092 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5093 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5094 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5095 EXPORT_SYMBOL_GPL(ata_host_intr
);
5096 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5097 EXPORT_SYMBOL_GPL(ata_id_string
);
5098 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5099 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5100 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5101 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5103 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5104 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5105 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5108 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5109 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5110 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5111 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5112 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5113 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5114 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5115 #endif /* CONFIG_PCI */
5117 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5118 EXPORT_SYMBOL_GPL(ata_device_resume
);
5119 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5120 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);