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 void ata_pio_error(struct ata_port
*ap
);
69 static unsigned int ata_dev_xfermask(struct ata_port
*ap
,
70 struct ata_device
*dev
);
72 static unsigned int ata_unique_id
= 1;
73 static struct workqueue_struct
*ata_wq
;
75 int atapi_enabled
= 0;
76 module_param(atapi_enabled
, int, 0444);
77 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
80 module_param_named(fua
, libata_fua
, int, 0444);
81 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
83 MODULE_AUTHOR("Jeff Garzik");
84 MODULE_DESCRIPTION("Library module for ATA devices");
85 MODULE_LICENSE("GPL");
86 MODULE_VERSION(DRV_VERSION
);
90 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
91 * @tf: Taskfile to convert
92 * @fis: Buffer into which data will output
93 * @pmp: Port multiplier port
95 * Converts a standard ATA taskfile to a Serial ATA
96 * FIS structure (Register - Host to Device).
99 * Inherited from caller.
102 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
104 fis
[0] = 0x27; /* Register - Host to Device FIS */
105 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
106 bit 7 indicates Command FIS */
107 fis
[2] = tf
->command
;
108 fis
[3] = tf
->feature
;
115 fis
[8] = tf
->hob_lbal
;
116 fis
[9] = tf
->hob_lbam
;
117 fis
[10] = tf
->hob_lbah
;
118 fis
[11] = tf
->hob_feature
;
121 fis
[13] = tf
->hob_nsect
;
132 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
133 * @fis: Buffer from which data will be input
134 * @tf: Taskfile to output
136 * Converts a serial ATA FIS structure to a standard ATA taskfile.
139 * Inherited from caller.
142 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
144 tf
->command
= fis
[2]; /* status */
145 tf
->feature
= fis
[3]; /* error */
152 tf
->hob_lbal
= fis
[8];
153 tf
->hob_lbam
= fis
[9];
154 tf
->hob_lbah
= fis
[10];
157 tf
->hob_nsect
= fis
[13];
160 static const u8 ata_rw_cmds
[] = {
164 ATA_CMD_READ_MULTI_EXT
,
165 ATA_CMD_WRITE_MULTI_EXT
,
169 ATA_CMD_WRITE_MULTI_FUA_EXT
,
173 ATA_CMD_PIO_READ_EXT
,
174 ATA_CMD_PIO_WRITE_EXT
,
187 ATA_CMD_WRITE_FUA_EXT
191 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
192 * @qc: command to examine and configure
194 * Examine the device configuration and tf->flags to calculate
195 * the proper read/write commands and protocol to use.
200 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
202 struct ata_taskfile
*tf
= &qc
->tf
;
203 struct ata_device
*dev
= qc
->dev
;
206 int index
, fua
, lba48
, write
;
208 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
209 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
210 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
212 if (dev
->flags
& ATA_DFLAG_PIO
) {
213 tf
->protocol
= ATA_PROT_PIO
;
214 index
= dev
->multi_count
? 0 : 8;
215 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
216 /* Unable to use DMA due to host limitation */
217 tf
->protocol
= ATA_PROT_PIO
;
218 index
= dev
->multi_count
? 0 : 8;
220 tf
->protocol
= ATA_PROT_DMA
;
224 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
233 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
234 * @pio_mask: pio_mask
235 * @mwdma_mask: mwdma_mask
236 * @udma_mask: udma_mask
238 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
239 * unsigned int xfer_mask.
247 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
248 unsigned int mwdma_mask
,
249 unsigned int udma_mask
)
251 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
252 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
253 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
256 static const struct ata_xfer_ent
{
257 unsigned int shift
, bits
;
260 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
261 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
262 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
267 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
268 * @xfer_mask: xfer_mask of interest
270 * Return matching XFER_* value for @xfer_mask. Only the highest
271 * bit of @xfer_mask is considered.
277 * Matching XFER_* value, 0 if no match found.
279 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
281 int highbit
= fls(xfer_mask
) - 1;
282 const struct ata_xfer_ent
*ent
;
284 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
285 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
286 return ent
->base
+ highbit
- ent
->shift
;
291 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
292 * @xfer_mode: XFER_* of interest
294 * Return matching xfer_mask for @xfer_mode.
300 * Matching xfer_mask, 0 if no match found.
302 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
304 const struct ata_xfer_ent
*ent
;
306 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
307 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
308 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
313 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
314 * @xfer_mode: XFER_* of interest
316 * Return matching xfer_shift for @xfer_mode.
322 * Matching xfer_shift, -1 if no match found.
324 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
326 const struct ata_xfer_ent
*ent
;
328 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
329 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
335 * ata_mode_string - convert xfer_mask to string
336 * @xfer_mask: mask of bits supported; only highest bit counts.
338 * Determine string which represents the highest speed
339 * (highest bit in @modemask).
345 * Constant C string representing highest speed listed in
346 * @mode_mask, or the constant C string "<n/a>".
348 static const char *ata_mode_string(unsigned int xfer_mask
)
350 static const char * const xfer_mode_str
[] = {
370 highbit
= fls(xfer_mask
) - 1;
371 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
372 return xfer_mode_str
[highbit
];
377 * ata_pio_devchk - PATA device presence detection
378 * @ap: ATA channel to examine
379 * @device: Device to examine (starting at zero)
381 * This technique was originally described in
382 * Hale Landis's ATADRVR (www.ata-atapi.com), and
383 * later found its way into the ATA/ATAPI spec.
385 * Write a pattern to the ATA shadow registers,
386 * and if a device is present, it will respond by
387 * correctly storing and echoing back the
388 * ATA shadow register contents.
394 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
397 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
400 ap
->ops
->dev_select(ap
, device
);
402 outb(0x55, ioaddr
->nsect_addr
);
403 outb(0xaa, ioaddr
->lbal_addr
);
405 outb(0xaa, ioaddr
->nsect_addr
);
406 outb(0x55, ioaddr
->lbal_addr
);
408 outb(0x55, ioaddr
->nsect_addr
);
409 outb(0xaa, ioaddr
->lbal_addr
);
411 nsect
= inb(ioaddr
->nsect_addr
);
412 lbal
= inb(ioaddr
->lbal_addr
);
414 if ((nsect
== 0x55) && (lbal
== 0xaa))
415 return 1; /* we found a device */
417 return 0; /* nothing found */
421 * ata_mmio_devchk - PATA device presence detection
422 * @ap: ATA channel to examine
423 * @device: Device to examine (starting at zero)
425 * This technique was originally described in
426 * Hale Landis's ATADRVR (www.ata-atapi.com), and
427 * later found its way into the ATA/ATAPI spec.
429 * Write a pattern to the ATA shadow registers,
430 * and if a device is present, it will respond by
431 * correctly storing and echoing back the
432 * ATA shadow register contents.
438 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
441 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
444 ap
->ops
->dev_select(ap
, device
);
446 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
447 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
449 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
450 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
452 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
453 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
455 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
456 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
458 if ((nsect
== 0x55) && (lbal
== 0xaa))
459 return 1; /* we found a device */
461 return 0; /* nothing found */
465 * ata_devchk - PATA device presence detection
466 * @ap: ATA channel to examine
467 * @device: Device to examine (starting at zero)
469 * Dispatch ATA device presence detection, depending
470 * on whether we are using PIO or MMIO to talk to the
471 * ATA shadow registers.
477 static unsigned int ata_devchk(struct ata_port
*ap
,
480 if (ap
->flags
& ATA_FLAG_MMIO
)
481 return ata_mmio_devchk(ap
, device
);
482 return ata_pio_devchk(ap
, device
);
486 * ata_dev_classify - determine device type based on ATA-spec signature
487 * @tf: ATA taskfile register set for device to be identified
489 * Determine from taskfile register contents whether a device is
490 * ATA or ATAPI, as per "Signature and persistence" section
491 * of ATA/PI spec (volume 1, sect 5.14).
497 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
498 * the event of failure.
501 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
503 /* Apple's open source Darwin code hints that some devices only
504 * put a proper signature into the LBA mid/high registers,
505 * So, we only check those. It's sufficient for uniqueness.
508 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
509 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
510 DPRINTK("found ATA device by sig\n");
514 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
515 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
516 DPRINTK("found ATAPI device by sig\n");
517 return ATA_DEV_ATAPI
;
520 DPRINTK("unknown device\n");
521 return ATA_DEV_UNKNOWN
;
525 * ata_dev_try_classify - Parse returned ATA device signature
526 * @ap: ATA channel to examine
527 * @device: Device to examine (starting at zero)
528 * @r_err: Value of error register on completion
530 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
531 * an ATA/ATAPI-defined set of values is placed in the ATA
532 * shadow registers, indicating the results of device detection
535 * Select the ATA device, and read the values from the ATA shadow
536 * registers. Then parse according to the Error register value,
537 * and the spec-defined values examined by ata_dev_classify().
543 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
547 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
549 struct ata_taskfile tf
;
553 ap
->ops
->dev_select(ap
, device
);
555 memset(&tf
, 0, sizeof(tf
));
557 ap
->ops
->tf_read(ap
, &tf
);
562 /* see if device passed diags */
565 else if ((device
== 0) && (err
== 0x81))
570 /* determine if device is ATA or ATAPI */
571 class = ata_dev_classify(&tf
);
573 if (class == ATA_DEV_UNKNOWN
)
575 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
581 * ata_id_string - Convert IDENTIFY DEVICE page into string
582 * @id: IDENTIFY DEVICE results we will examine
583 * @s: string into which data is output
584 * @ofs: offset into identify device page
585 * @len: length of string to return. must be an even number.
587 * The strings in the IDENTIFY DEVICE page are broken up into
588 * 16-bit chunks. Run through the string, and output each
589 * 8-bit chunk linearly, regardless of platform.
595 void ata_id_string(const u16
*id
, unsigned char *s
,
596 unsigned int ofs
, unsigned int len
)
615 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
616 * @id: IDENTIFY DEVICE results we will examine
617 * @s: string into which data is output
618 * @ofs: offset into identify device page
619 * @len: length of string to return. must be an odd number.
621 * This function is identical to ata_id_string except that it
622 * trims trailing spaces and terminates the resulting string with
623 * null. @len must be actual maximum length (even number) + 1.
628 void ata_id_c_string(const u16
*id
, unsigned char *s
,
629 unsigned int ofs
, unsigned int len
)
635 ata_id_string(id
, s
, ofs
, len
- 1);
637 p
= s
+ strnlen(s
, len
- 1);
638 while (p
> s
&& p
[-1] == ' ')
643 static u64
ata_id_n_sectors(const u16
*id
)
645 if (ata_id_has_lba(id
)) {
646 if (ata_id_has_lba48(id
))
647 return ata_id_u64(id
, 100);
649 return ata_id_u32(id
, 60);
651 if (ata_id_current_chs_valid(id
))
652 return ata_id_u32(id
, 57);
654 return id
[1] * id
[3] * id
[6];
659 * ata_noop_dev_select - Select device 0/1 on ATA bus
660 * @ap: ATA channel to manipulate
661 * @device: ATA device (numbered from zero) to select
663 * This function performs no actual function.
665 * May be used as the dev_select() entry in ata_port_operations.
670 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
676 * ata_std_dev_select - Select device 0/1 on ATA bus
677 * @ap: ATA channel to manipulate
678 * @device: ATA device (numbered from zero) to select
680 * Use the method defined in the ATA specification to
681 * make either device 0, or device 1, active on the
682 * ATA channel. Works with both PIO and MMIO.
684 * May be used as the dev_select() entry in ata_port_operations.
690 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
695 tmp
= ATA_DEVICE_OBS
;
697 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
699 if (ap
->flags
& ATA_FLAG_MMIO
) {
700 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
702 outb(tmp
, ap
->ioaddr
.device_addr
);
704 ata_pause(ap
); /* needed; also flushes, for mmio */
708 * ata_dev_select - Select device 0/1 on ATA bus
709 * @ap: ATA channel to manipulate
710 * @device: ATA device (numbered from zero) to select
711 * @wait: non-zero to wait for Status register BSY bit to clear
712 * @can_sleep: non-zero if context allows sleeping
714 * Use the method defined in the ATA specification to
715 * make either device 0, or device 1, active on the
718 * This is a high-level version of ata_std_dev_select(),
719 * which additionally provides the services of inserting
720 * the proper pauses and status polling, where needed.
726 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
727 unsigned int wait
, unsigned int can_sleep
)
729 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
730 ap
->id
, device
, wait
);
735 ap
->ops
->dev_select(ap
, device
);
738 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
745 * ata_dump_id - IDENTIFY DEVICE info debugging output
746 * @id: IDENTIFY DEVICE page to dump
748 * Dump selected 16-bit words from the given IDENTIFY DEVICE
755 static inline void ata_dump_id(const u16
*id
)
757 DPRINTK("49==0x%04x "
767 DPRINTK("80==0x%04x "
777 DPRINTK("88==0x%04x "
784 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
785 * @id: IDENTIFY data to compute xfer mask from
787 * Compute the xfermask for this device. This is not as trivial
788 * as it seems if we must consider early devices correctly.
790 * FIXME: pre IDE drive timing (do we care ?).
798 static unsigned int ata_id_xfermask(const u16
*id
)
800 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
802 /* Usual case. Word 53 indicates word 64 is valid */
803 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
804 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
808 /* If word 64 isn't valid then Word 51 high byte holds
809 * the PIO timing number for the maximum. Turn it into
812 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
814 /* But wait.. there's more. Design your standards by
815 * committee and you too can get a free iordy field to
816 * process. However its the speeds not the modes that
817 * are supported... Note drivers using the timing API
818 * will get this right anyway
822 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
823 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
825 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
829 * ata_port_queue_task - Queue port_task
830 * @ap: The ata_port to queue port_task for
832 * Schedule @fn(@data) for execution after @delay jiffies using
833 * port_task. There is one port_task per port and it's the
834 * user(low level driver)'s responsibility to make sure that only
835 * one task is active at any given time.
837 * libata core layer takes care of synchronization between
838 * port_task and EH. ata_port_queue_task() may be ignored for EH
842 * Inherited from caller.
844 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
849 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
852 PREPARE_WORK(&ap
->port_task
, fn
, data
);
855 rc
= queue_work(ata_wq
, &ap
->port_task
);
857 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
859 /* rc == 0 means that another user is using port task */
864 * ata_port_flush_task - Flush port_task
865 * @ap: The ata_port to flush port_task for
867 * After this function completes, port_task is guranteed not to
868 * be running or scheduled.
871 * Kernel thread context (may sleep)
873 void ata_port_flush_task(struct ata_port
*ap
)
879 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
880 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
881 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
883 DPRINTK("flush #1\n");
884 flush_workqueue(ata_wq
);
887 * At this point, if a task is running, it's guaranteed to see
888 * the FLUSH flag; thus, it will never queue pio tasks again.
891 if (!cancel_delayed_work(&ap
->port_task
)) {
892 DPRINTK("flush #2\n");
893 flush_workqueue(ata_wq
);
896 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
897 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
898 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
903 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
905 struct completion
*waiting
= qc
->private_data
;
907 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
912 * ata_exec_internal - execute libata internal command
913 * @ap: Port to which the command is sent
914 * @dev: Device to which the command is sent
915 * @tf: Taskfile registers for the command and the result
916 * @dma_dir: Data tranfer direction of the command
917 * @buf: Data buffer of the command
918 * @buflen: Length of data buffer
920 * Executes libata internal command with timeout. @tf contains
921 * command on entry and result on return. Timeout and error
922 * conditions are reported via return value. No recovery action
923 * is taken after a command times out. It's caller's duty to
924 * clean up after timeout.
927 * None. Should be called with kernel context, might sleep.
931 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
932 struct ata_taskfile
*tf
,
933 int dma_dir
, void *buf
, unsigned int buflen
)
935 u8 command
= tf
->command
;
936 struct ata_queued_cmd
*qc
;
937 DECLARE_COMPLETION(wait
);
939 unsigned int err_mask
;
941 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
943 qc
= ata_qc_new_init(ap
, dev
);
947 qc
->dma_dir
= dma_dir
;
948 if (dma_dir
!= DMA_NONE
) {
949 ata_sg_init_one(qc
, buf
, buflen
);
950 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
953 qc
->private_data
= &wait
;
954 qc
->complete_fn
= ata_qc_complete_internal
;
956 qc
->err_mask
= ata_qc_issue(qc
);
960 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
962 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
963 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
965 /* We're racing with irq here. If we lose, the
966 * following test prevents us from completing the qc
967 * again. If completion irq occurs after here but
968 * before the caller cleans up, it will result in a
969 * spurious interrupt. We can live with that.
971 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
972 qc
->err_mask
= AC_ERR_TIMEOUT
;
974 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
978 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
982 err_mask
= qc
->err_mask
;
990 * ata_pio_need_iordy - check if iordy needed
993 * Check if the current speed of the device requires IORDY. Used
994 * by various controllers for chip configuration.
997 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1000 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1007 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1009 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1010 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1011 /* Is the speed faster than the drive allows non IORDY ? */
1013 /* This is cycle times not frequency - watch the logic! */
1014 if (pio
> 240) /* PIO2 is 240nS per cycle */
1023 * ata_dev_read_id - Read ID data from the specified device
1024 * @ap: port on which target device resides
1025 * @dev: target device
1026 * @p_class: pointer to class of the target device (may be changed)
1027 * @post_reset: is this read ID post-reset?
1028 * @p_id: read IDENTIFY page (newly allocated)
1030 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1031 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1032 * devices. This function also takes care of EDD signature
1033 * misreporting (to be removed once EDD support is gone) and
1034 * issues ATA_CMD_INIT_DEV_PARAMS for pre-ATA4 drives.
1037 * Kernel thread context (may sleep)
1040 * 0 on success, -errno otherwise.
1042 static int ata_dev_read_id(struct ata_port
*ap
, struct ata_device
*dev
,
1043 unsigned int *p_class
, int post_reset
, u16
**p_id
)
1045 unsigned int class = *p_class
;
1046 unsigned int using_edd
;
1047 struct ata_taskfile tf
;
1048 unsigned int err_mask
= 0;
1053 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1055 if (ap
->ops
->probe_reset
||
1056 ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
1061 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1063 id
= kmalloc(sizeof(id
[0]) * ATA_ID_WORDS
, GFP_KERNEL
);
1066 reason
= "out of memory";
1071 ata_tf_init(ap
, &tf
, dev
->devno
);
1075 tf
.command
= ATA_CMD_ID_ATA
;
1078 tf
.command
= ATA_CMD_ID_ATAPI
;
1082 reason
= "unsupported class";
1086 tf
.protocol
= ATA_PROT_PIO
;
1088 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1089 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1093 reason
= "I/O error";
1095 if (err_mask
& ~AC_ERR_DEV
)
1099 * arg! EDD works for all test cases, but seems to return
1100 * the ATA signature for some ATAPI devices. Until the
1101 * reason for this is found and fixed, we fix up the mess
1102 * here. If IDENTIFY DEVICE returns command aborted
1103 * (as ATAPI devices do), then we issue an
1104 * IDENTIFY PACKET DEVICE.
1106 * ATA software reset (SRST, the default) does not appear
1107 * to have this problem.
1109 if ((using_edd
) && (class == ATA_DEV_ATA
)) {
1110 u8 err
= tf
.feature
;
1111 if (err
& ATA_ABORTED
) {
1112 class = ATA_DEV_ATAPI
;
1119 swap_buf_le16(id
, ATA_ID_WORDS
);
1121 /* print device capabilities */
1122 printk(KERN_DEBUG
"ata%u: dev %u cfg "
1123 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1125 id
[49], id
[82], id
[83], id
[84], id
[85], id
[86], id
[87], id
[88]);
1128 if ((class == ATA_DEV_ATA
) != ata_id_is_ata(id
)) {
1130 reason
= "device reports illegal type";
1134 if (post_reset
&& class == ATA_DEV_ATA
) {
1136 * The exact sequence expected by certain pre-ATA4 drives is:
1139 * INITIALIZE DEVICE PARAMETERS
1141 * Some drives were very specific about that exact sequence.
1143 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1144 err_mask
= ata_dev_init_params(ap
, dev
);
1147 reason
= "INIT_DEV_PARAMS failed";
1151 /* current CHS translation info (id[53-58]) might be
1152 * changed. reread the identify device info.
1164 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1165 ap
->id
, dev
->devno
, reason
);
1170 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1171 struct ata_device
*dev
)
1173 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1177 * ata_dev_configure - Configure the specified ATA/ATAPI device
1178 * @ap: Port on which target device resides
1179 * @dev: Target device to configure
1180 * @print_info: Enable device info printout
1182 * Configure @dev according to @dev->id. Generic and low-level
1183 * driver specific fixups are also applied.
1186 * Kernel thread context (may sleep)
1189 * 0 on success, -errno otherwise
1191 static int ata_dev_configure(struct ata_port
*ap
, struct ata_device
*dev
,
1194 unsigned int xfer_mask
;
1197 if (!ata_dev_present(dev
)) {
1198 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1199 ap
->id
, dev
->devno
);
1203 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1205 /* initialize to-be-configured parameters */
1207 dev
->max_sectors
= 0;
1215 * common ATA, ATAPI feature tests
1218 /* we require DMA support (bits 8 of word 49) */
1219 if (!ata_id_has_dma(dev
->id
)) {
1220 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1225 /* find max transfer mode; for printk only */
1226 xfer_mask
= ata_id_xfermask(dev
->id
);
1228 ata_dump_id(dev
->id
);
1230 /* ATA-specific feature tests */
1231 if (dev
->class == ATA_DEV_ATA
) {
1232 dev
->n_sectors
= ata_id_n_sectors(dev
->id
);
1234 if (ata_id_has_lba(dev
->id
)) {
1235 const char *lba_desc
;
1238 dev
->flags
|= ATA_DFLAG_LBA
;
1239 if (ata_id_has_lba48(dev
->id
)) {
1240 dev
->flags
|= ATA_DFLAG_LBA48
;
1244 /* print device info to dmesg */
1246 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1247 "max %s, %Lu sectors: %s\n",
1249 ata_id_major_version(dev
->id
),
1250 ata_mode_string(xfer_mask
),
1251 (unsigned long long)dev
->n_sectors
,
1256 /* Default translation */
1257 dev
->cylinders
= dev
->id
[1];
1258 dev
->heads
= dev
->id
[3];
1259 dev
->sectors
= dev
->id
[6];
1261 if (ata_id_current_chs_valid(dev
->id
)) {
1262 /* Current CHS translation is valid. */
1263 dev
->cylinders
= dev
->id
[54];
1264 dev
->heads
= dev
->id
[55];
1265 dev
->sectors
= dev
->id
[56];
1268 /* print device info to dmesg */
1270 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1271 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1273 ata_id_major_version(dev
->id
),
1274 ata_mode_string(xfer_mask
),
1275 (unsigned long long)dev
->n_sectors
,
1276 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1279 if (dev
->id
[59] & 0x100) {
1280 dev
->multi_count
= dev
->id
[59] & 0xff;
1281 DPRINTK("ata%u: dev %u multi count %u\n",
1282 ap
->id
, device
, dev
->multi_count
);
1287 /* ATAPI-specific feature tests */
1288 else if (dev
->class == ATA_DEV_ATAPI
) {
1289 rc
= atapi_cdb_len(dev
->id
);
1290 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1291 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1295 dev
->cdb_len
= (unsigned int) rc
;
1297 if (ata_id_cdb_intr(dev
->id
))
1298 dev
->flags
|= ATA_DFLAG_CDB_INTR
;
1300 /* print device info to dmesg */
1302 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1303 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1306 ap
->host
->max_cmd_len
= 0;
1307 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1308 ap
->host
->max_cmd_len
= max_t(unsigned int,
1309 ap
->host
->max_cmd_len
,
1310 ap
->device
[i
].cdb_len
);
1312 /* limit bridge transfers to udma5, 200 sectors */
1313 if (ata_dev_knobble(ap
, dev
)) {
1315 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1316 ap
->id
, dev
->devno
);
1317 ap
->udma_mask
&= ATA_UDMA5
;
1318 dev
->max_sectors
= ATA_MAX_SECTORS
;
1321 if (ap
->ops
->dev_config
)
1322 ap
->ops
->dev_config(ap
, dev
);
1324 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1328 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1329 ap
->id
, dev
->devno
);
1330 DPRINTK("EXIT, err\n");
1335 * ata_bus_probe - Reset and probe ATA bus
1338 * Master ATA bus probing function. Initiates a hardware-dependent
1339 * bus reset, then attempts to identify any devices found on
1343 * PCI/etc. bus probe sem.
1346 * Zero on success, non-zero on error.
1349 static int ata_bus_probe(struct ata_port
*ap
)
1351 unsigned int classes
[ATA_MAX_DEVICES
];
1352 unsigned int i
, rc
, found
= 0;
1357 if (ap
->ops
->probe_reset
) {
1358 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1359 classes
[i
] = ATA_DEV_UNKNOWN
;
1361 rc
= ap
->ops
->probe_reset(ap
, classes
);
1363 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1367 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1368 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1369 classes
[i
] = ATA_DEV_NONE
;
1371 ap
->ops
->phy_reset(ap
);
1373 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1374 if (!(ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1375 classes
[i
] = ap
->device
[i
].class;
1377 ap
->device
[i
].class = ATA_DEV_UNKNOWN
;
1382 /* read IDENTIFY page and configure devices */
1383 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1384 struct ata_device
*dev
= &ap
->device
[i
];
1386 dev
->class = classes
[i
];
1388 if (!ata_dev_present(dev
))
1391 WARN_ON(dev
->id
!= NULL
);
1392 if (ata_dev_read_id(ap
, dev
, &dev
->class, 1, &dev
->id
)) {
1393 dev
->class = ATA_DEV_NONE
;
1397 if (ata_dev_configure(ap
, dev
, 1)) {
1398 dev
->class++; /* disable device */
1406 goto err_out_disable
;
1409 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1410 goto err_out_disable
;
1415 ap
->ops
->port_disable(ap
);
1420 * ata_port_probe - Mark port as enabled
1421 * @ap: Port for which we indicate enablement
1423 * Modify @ap data structure such that the system
1424 * thinks that the entire port is enabled.
1426 * LOCKING: host_set lock, or some other form of
1430 void ata_port_probe(struct ata_port
*ap
)
1432 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1436 * sata_print_link_status - Print SATA link status
1437 * @ap: SATA port to printk link status about
1439 * This function prints link speed and status of a SATA link.
1444 static void sata_print_link_status(struct ata_port
*ap
)
1449 if (!ap
->ops
->scr_read
)
1452 sstatus
= scr_read(ap
, SCR_STATUS
);
1454 if (sata_dev_present(ap
)) {
1455 tmp
= (sstatus
>> 4) & 0xf;
1458 else if (tmp
& (1 << 1))
1461 speed
= "<unknown>";
1462 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1463 ap
->id
, speed
, sstatus
);
1465 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1471 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1472 * @ap: SATA port associated with target SATA PHY.
1474 * This function issues commands to standard SATA Sxxx
1475 * PHY registers, to wake up the phy (and device), and
1476 * clear any reset condition.
1479 * PCI/etc. bus probe sem.
1482 void __sata_phy_reset(struct ata_port
*ap
)
1485 unsigned long timeout
= jiffies
+ (HZ
* 5);
1487 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1488 /* issue phy wake/reset */
1489 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1490 /* Couldn't find anything in SATA I/II specs, but
1491 * AHCI-1.1 10.4.2 says at least 1 ms. */
1494 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1496 /* wait for phy to become ready, if necessary */
1499 sstatus
= scr_read(ap
, SCR_STATUS
);
1500 if ((sstatus
& 0xf) != 1)
1502 } while (time_before(jiffies
, timeout
));
1504 /* print link status */
1505 sata_print_link_status(ap
);
1507 /* TODO: phy layer with polling, timeouts, etc. */
1508 if (sata_dev_present(ap
))
1511 ata_port_disable(ap
);
1513 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1516 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1517 ata_port_disable(ap
);
1521 ap
->cbl
= ATA_CBL_SATA
;
1525 * sata_phy_reset - Reset SATA bus.
1526 * @ap: SATA port associated with target SATA PHY.
1528 * This function resets the SATA bus, and then probes
1529 * the bus for devices.
1532 * PCI/etc. bus probe sem.
1535 void sata_phy_reset(struct ata_port
*ap
)
1537 __sata_phy_reset(ap
);
1538 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1544 * ata_port_disable - Disable port.
1545 * @ap: Port to be disabled.
1547 * Modify @ap data structure such that the system
1548 * thinks that the entire port is disabled, and should
1549 * never attempt to probe or communicate with devices
1552 * LOCKING: host_set lock, or some other form of
1556 void ata_port_disable(struct ata_port
*ap
)
1558 ap
->device
[0].class = ATA_DEV_NONE
;
1559 ap
->device
[1].class = ATA_DEV_NONE
;
1560 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1564 * This mode timing computation functionality is ported over from
1565 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1568 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1569 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1570 * for PIO 5, which is a nonstandard extension and UDMA6, which
1571 * is currently supported only by Maxtor drives.
1574 static const struct ata_timing ata_timing
[] = {
1576 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1577 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1578 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1579 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1581 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1582 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1583 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1585 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1587 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1588 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1589 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1591 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1592 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1593 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1595 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1596 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1597 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1599 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1600 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1601 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1603 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1608 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1609 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1611 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1613 q
->setup
= EZ(t
->setup
* 1000, T
);
1614 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1615 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1616 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1617 q
->active
= EZ(t
->active
* 1000, T
);
1618 q
->recover
= EZ(t
->recover
* 1000, T
);
1619 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1620 q
->udma
= EZ(t
->udma
* 1000, UT
);
1623 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1624 struct ata_timing
*m
, unsigned int what
)
1626 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1627 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1628 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1629 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1630 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1631 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1632 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1633 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1636 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1638 const struct ata_timing
*t
;
1640 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1641 if (t
->mode
== 0xFF)
1646 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1647 struct ata_timing
*t
, int T
, int UT
)
1649 const struct ata_timing
*s
;
1650 struct ata_timing p
;
1656 if (!(s
= ata_timing_find_mode(speed
)))
1659 memcpy(t
, s
, sizeof(*s
));
1662 * If the drive is an EIDE drive, it can tell us it needs extended
1663 * PIO/MW_DMA cycle timing.
1666 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1667 memset(&p
, 0, sizeof(p
));
1668 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1669 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1670 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1671 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1672 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1674 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1678 * Convert the timing to bus clock counts.
1681 ata_timing_quantize(t
, t
, T
, UT
);
1684 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1685 * S.M.A.R.T * and some other commands. We have to ensure that the
1686 * DMA cycle timing is slower/equal than the fastest PIO timing.
1689 if (speed
> XFER_PIO_4
) {
1690 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1691 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1695 * Lengthen active & recovery time so that cycle time is correct.
1698 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1699 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1700 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1703 if (t
->active
+ t
->recover
< t
->cycle
) {
1704 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1705 t
->recover
= t
->cycle
- t
->active
;
1711 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1713 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1716 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1717 dev
->flags
|= ATA_DFLAG_PIO
;
1719 ata_dev_set_xfermode(ap
, dev
);
1721 if (ata_dev_revalidate(ap
, dev
, 0)) {
1722 printk(KERN_ERR
"ata%u: failed to revalidate after set "
1723 "xfermode, disabled\n", ap
->id
);
1724 ata_port_disable(ap
);
1727 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1728 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1730 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1732 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1735 static int ata_host_set_pio(struct ata_port
*ap
)
1739 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1740 struct ata_device
*dev
= &ap
->device
[i
];
1742 if (!ata_dev_present(dev
))
1745 if (!dev
->pio_mode
) {
1746 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1750 dev
->xfer_mode
= dev
->pio_mode
;
1751 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1752 if (ap
->ops
->set_piomode
)
1753 ap
->ops
->set_piomode(ap
, dev
);
1759 static void ata_host_set_dma(struct ata_port
*ap
)
1763 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1764 struct ata_device
*dev
= &ap
->device
[i
];
1766 if (!ata_dev_present(dev
) || !dev
->dma_mode
)
1769 dev
->xfer_mode
= dev
->dma_mode
;
1770 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
1771 if (ap
->ops
->set_dmamode
)
1772 ap
->ops
->set_dmamode(ap
, dev
);
1777 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1778 * @ap: port on which timings will be programmed
1780 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1783 * PCI/etc. bus probe sem.
1785 static void ata_set_mode(struct ata_port
*ap
)
1789 /* step 1: calculate xfer_mask */
1790 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1791 struct ata_device
*dev
= &ap
->device
[i
];
1792 unsigned int xfer_mask
;
1794 if (!ata_dev_present(dev
))
1797 xfer_mask
= ata_dev_xfermask(ap
, dev
);
1799 dev
->pio_mode
= ata_xfer_mask2mode(xfer_mask
& ATA_MASK_PIO
);
1800 dev
->dma_mode
= ata_xfer_mask2mode(xfer_mask
& (ATA_MASK_MWDMA
|
1804 /* step 2: always set host PIO timings */
1805 rc
= ata_host_set_pio(ap
);
1809 /* step 3: set host DMA timings */
1810 ata_host_set_dma(ap
);
1812 /* step 4: update devices' xfer mode */
1813 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1814 ata_dev_set_mode(ap
, &ap
->device
[i
]);
1816 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1819 if (ap
->ops
->post_set_mode
)
1820 ap
->ops
->post_set_mode(ap
);
1825 ata_port_disable(ap
);
1829 * ata_tf_to_host - issue ATA taskfile to host controller
1830 * @ap: port to which command is being issued
1831 * @tf: ATA taskfile register set
1833 * Issues ATA taskfile register set to ATA host controller,
1834 * with proper synchronization with interrupt handler and
1838 * spin_lock_irqsave(host_set lock)
1841 static inline void ata_tf_to_host(struct ata_port
*ap
,
1842 const struct ata_taskfile
*tf
)
1844 ap
->ops
->tf_load(ap
, tf
);
1845 ap
->ops
->exec_command(ap
, tf
);
1849 * ata_busy_sleep - sleep until BSY clears, or timeout
1850 * @ap: port containing status register to be polled
1851 * @tmout_pat: impatience timeout
1852 * @tmout: overall timeout
1854 * Sleep until ATA Status register bit BSY clears,
1855 * or a timeout occurs.
1860 unsigned int ata_busy_sleep (struct ata_port
*ap
,
1861 unsigned long tmout_pat
, unsigned long tmout
)
1863 unsigned long timer_start
, timeout
;
1866 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1867 timer_start
= jiffies
;
1868 timeout
= timer_start
+ tmout_pat
;
1869 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1871 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1874 if (status
& ATA_BUSY
)
1875 printk(KERN_WARNING
"ata%u is slow to respond, "
1876 "please be patient\n", ap
->id
);
1878 timeout
= timer_start
+ tmout
;
1879 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1881 status
= ata_chk_status(ap
);
1884 if (status
& ATA_BUSY
) {
1885 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1886 ap
->id
, tmout
/ HZ
);
1893 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1895 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1896 unsigned int dev0
= devmask
& (1 << 0);
1897 unsigned int dev1
= devmask
& (1 << 1);
1898 unsigned long timeout
;
1900 /* if device 0 was found in ata_devchk, wait for its
1904 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1906 /* if device 1 was found in ata_devchk, wait for
1907 * register access, then wait for BSY to clear
1909 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1913 ap
->ops
->dev_select(ap
, 1);
1914 if (ap
->flags
& ATA_FLAG_MMIO
) {
1915 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1916 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1918 nsect
= inb(ioaddr
->nsect_addr
);
1919 lbal
= inb(ioaddr
->lbal_addr
);
1921 if ((nsect
== 1) && (lbal
== 1))
1923 if (time_after(jiffies
, timeout
)) {
1927 msleep(50); /* give drive a breather */
1930 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1932 /* is all this really necessary? */
1933 ap
->ops
->dev_select(ap
, 0);
1935 ap
->ops
->dev_select(ap
, 1);
1937 ap
->ops
->dev_select(ap
, 0);
1941 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1942 * @ap: Port to reset and probe
1944 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1945 * probe the bus. Not often used these days.
1948 * PCI/etc. bus probe sem.
1949 * Obtains host_set lock.
1953 static unsigned int ata_bus_edd(struct ata_port
*ap
)
1955 struct ata_taskfile tf
;
1956 unsigned long flags
;
1958 /* set up execute-device-diag (bus reset) taskfile */
1959 /* also, take interrupts to a known state (disabled) */
1960 DPRINTK("execute-device-diag\n");
1961 ata_tf_init(ap
, &tf
, 0);
1963 tf
.command
= ATA_CMD_EDD
;
1964 tf
.protocol
= ATA_PROT_NODATA
;
1967 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1968 ata_tf_to_host(ap
, &tf
);
1969 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1971 /* spec says at least 2ms. but who knows with those
1972 * crazy ATAPI devices...
1976 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1979 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1980 unsigned int devmask
)
1982 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1984 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
1986 /* software reset. causes dev0 to be selected */
1987 if (ap
->flags
& ATA_FLAG_MMIO
) {
1988 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1989 udelay(20); /* FIXME: flush */
1990 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
1991 udelay(20); /* FIXME: flush */
1992 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1994 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1996 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
1998 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2001 /* spec mandates ">= 2ms" before checking status.
2002 * We wait 150ms, because that was the magic delay used for
2003 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2004 * between when the ATA command register is written, and then
2005 * status is checked. Because waiting for "a while" before
2006 * checking status is fine, post SRST, we perform this magic
2007 * delay here as well.
2011 ata_bus_post_reset(ap
, devmask
);
2017 * ata_bus_reset - reset host port and associated ATA channel
2018 * @ap: port to reset
2020 * This is typically the first time we actually start issuing
2021 * commands to the ATA channel. We wait for BSY to clear, then
2022 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2023 * result. Determine what devices, if any, are on the channel
2024 * by looking at the device 0/1 error register. Look at the signature
2025 * stored in each device's taskfile registers, to determine if
2026 * the device is ATA or ATAPI.
2029 * PCI/etc. bus probe sem.
2030 * Obtains host_set lock.
2033 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2036 void ata_bus_reset(struct ata_port
*ap
)
2038 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2039 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2041 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
2043 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2045 /* determine if device 0/1 are present */
2046 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2049 dev0
= ata_devchk(ap
, 0);
2051 dev1
= ata_devchk(ap
, 1);
2055 devmask
|= (1 << 0);
2057 devmask
|= (1 << 1);
2059 /* select device 0 again */
2060 ap
->ops
->dev_select(ap
, 0);
2062 /* issue bus reset */
2063 if (ap
->flags
& ATA_FLAG_SRST
)
2064 rc
= ata_bus_softreset(ap
, devmask
);
2065 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
2066 /* set up device control */
2067 if (ap
->flags
& ATA_FLAG_MMIO
)
2068 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2070 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2071 rc
= ata_bus_edd(ap
);
2078 * determine by signature whether we have ATA or ATAPI devices
2080 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2081 if ((slave_possible
) && (err
!= 0x81))
2082 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2084 /* re-enable interrupts */
2085 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2088 /* is double-select really necessary? */
2089 if (ap
->device
[1].class != ATA_DEV_NONE
)
2090 ap
->ops
->dev_select(ap
, 1);
2091 if (ap
->device
[0].class != ATA_DEV_NONE
)
2092 ap
->ops
->dev_select(ap
, 0);
2094 /* if no devices were detected, disable this port */
2095 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2096 (ap
->device
[1].class == ATA_DEV_NONE
))
2099 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2100 /* set up device control for ATA_FLAG_SATA_RESET */
2101 if (ap
->flags
& ATA_FLAG_MMIO
)
2102 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2104 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2111 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2112 ap
->ops
->port_disable(ap
);
2117 static int sata_phy_resume(struct ata_port
*ap
)
2119 unsigned long timeout
= jiffies
+ (HZ
* 5);
2122 scr_write_flush(ap
, SCR_CONTROL
, 0x300);
2124 /* Wait for phy to become ready, if necessary. */
2127 sstatus
= scr_read(ap
, SCR_STATUS
);
2128 if ((sstatus
& 0xf) != 1)
2130 } while (time_before(jiffies
, timeout
));
2136 * ata_std_probeinit - initialize probing
2137 * @ap: port to be probed
2139 * @ap is about to be probed. Initialize it. This function is
2140 * to be used as standard callback for ata_drive_probe_reset().
2142 * NOTE!!! Do not use this function as probeinit if a low level
2143 * driver implements only hardreset. Just pass NULL as probeinit
2144 * in that case. Using this function is probably okay but doing
2145 * so makes reset sequence different from the original
2146 * ->phy_reset implementation and Jeff nervous. :-P
2148 extern void ata_std_probeinit(struct ata_port
*ap
)
2150 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
) {
2151 sata_phy_resume(ap
);
2152 if (sata_dev_present(ap
))
2153 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2158 * ata_std_softreset - reset host port via ATA SRST
2159 * @ap: port to reset
2160 * @verbose: fail verbosely
2161 * @classes: resulting classes of attached devices
2163 * Reset host port using ATA SRST. This function is to be used
2164 * as standard callback for ata_drive_*_reset() functions.
2167 * Kernel thread context (may sleep)
2170 * 0 on success, -errno otherwise.
2172 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2174 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2175 unsigned int devmask
= 0, err_mask
;
2180 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2181 classes
[0] = ATA_DEV_NONE
;
2185 /* determine if device 0/1 are present */
2186 if (ata_devchk(ap
, 0))
2187 devmask
|= (1 << 0);
2188 if (slave_possible
&& ata_devchk(ap
, 1))
2189 devmask
|= (1 << 1);
2191 /* select device 0 again */
2192 ap
->ops
->dev_select(ap
, 0);
2194 /* issue bus reset */
2195 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2196 err_mask
= ata_bus_softreset(ap
, devmask
);
2199 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2202 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2207 /* determine by signature whether we have ATA or ATAPI devices */
2208 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2209 if (slave_possible
&& err
!= 0x81)
2210 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2213 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2218 * sata_std_hardreset - reset host port via SATA phy reset
2219 * @ap: port to reset
2220 * @verbose: fail verbosely
2221 * @class: resulting class of attached device
2223 * SATA phy-reset host port using DET bits of SControl register.
2224 * This function is to be used as standard callback for
2225 * ata_drive_*_reset().
2228 * Kernel thread context (may sleep)
2231 * 0 on success, -errno otherwise.
2233 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2237 /* Issue phy wake/reset */
2238 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
2241 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2242 * 10.4.2 says at least 1 ms.
2246 /* Bring phy back */
2247 sata_phy_resume(ap
);
2249 /* TODO: phy layer with polling, timeouts, etc. */
2250 if (!sata_dev_present(ap
)) {
2251 *class = ATA_DEV_NONE
;
2252 DPRINTK("EXIT, link offline\n");
2256 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2258 printk(KERN_ERR
"ata%u: COMRESET failed "
2259 "(device not ready)\n", ap
->id
);
2261 DPRINTK("EXIT, device not ready\n");
2265 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2267 *class = ata_dev_try_classify(ap
, 0, NULL
);
2269 DPRINTK("EXIT, class=%u\n", *class);
2274 * ata_std_postreset - standard postreset callback
2275 * @ap: the target ata_port
2276 * @classes: classes of attached devices
2278 * This function is invoked after a successful reset. Note that
2279 * the device might have been reset more than once using
2280 * different reset methods before postreset is invoked.
2282 * This function is to be used as standard callback for
2283 * ata_drive_*_reset().
2286 * Kernel thread context (may sleep)
2288 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2292 /* set cable type if it isn't already set */
2293 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2294 ap
->cbl
= ATA_CBL_SATA
;
2296 /* print link status */
2297 if (ap
->cbl
== ATA_CBL_SATA
)
2298 sata_print_link_status(ap
);
2300 /* re-enable interrupts */
2301 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2304 /* is double-select really necessary? */
2305 if (classes
[0] != ATA_DEV_NONE
)
2306 ap
->ops
->dev_select(ap
, 1);
2307 if (classes
[1] != ATA_DEV_NONE
)
2308 ap
->ops
->dev_select(ap
, 0);
2310 /* bail out if no device is present */
2311 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2312 DPRINTK("EXIT, no device\n");
2316 /* set up device control */
2317 if (ap
->ioaddr
.ctl_addr
) {
2318 if (ap
->flags
& ATA_FLAG_MMIO
)
2319 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2321 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2328 * ata_std_probe_reset - standard probe reset method
2329 * @ap: prot to perform probe-reset
2330 * @classes: resulting classes of attached devices
2332 * The stock off-the-shelf ->probe_reset method.
2335 * Kernel thread context (may sleep)
2338 * 0 on success, -errno otherwise.
2340 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2342 ata_reset_fn_t hardreset
;
2345 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2346 hardreset
= sata_std_hardreset
;
2348 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2349 ata_std_softreset
, hardreset
,
2350 ata_std_postreset
, classes
);
2353 static int do_probe_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2354 ata_postreset_fn_t postreset
,
2355 unsigned int *classes
)
2359 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2360 classes
[i
] = ATA_DEV_UNKNOWN
;
2362 rc
= reset(ap
, 0, classes
);
2366 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2367 * is complete and convert all ATA_DEV_UNKNOWN to
2370 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2371 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2374 if (i
< ATA_MAX_DEVICES
)
2375 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2376 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2377 classes
[i
] = ATA_DEV_NONE
;
2380 postreset(ap
, classes
);
2382 return classes
[0] != ATA_DEV_UNKNOWN
? 0 : -ENODEV
;
2386 * ata_drive_probe_reset - Perform probe reset with given methods
2387 * @ap: port to reset
2388 * @probeinit: probeinit method (can be NULL)
2389 * @softreset: softreset method (can be NULL)
2390 * @hardreset: hardreset method (can be NULL)
2391 * @postreset: postreset method (can be NULL)
2392 * @classes: resulting classes of attached devices
2394 * Reset the specified port and classify attached devices using
2395 * given methods. This function prefers softreset but tries all
2396 * possible reset sequences to reset and classify devices. This
2397 * function is intended to be used for constructing ->probe_reset
2398 * callback by low level drivers.
2400 * Reset methods should follow the following rules.
2402 * - Return 0 on sucess, -errno on failure.
2403 * - If classification is supported, fill classes[] with
2404 * recognized class codes.
2405 * - If classification is not supported, leave classes[] alone.
2406 * - If verbose is non-zero, print error message on failure;
2407 * otherwise, shut up.
2410 * Kernel thread context (may sleep)
2413 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2414 * if classification fails, and any error code from reset
2417 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2418 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2419 ata_postreset_fn_t postreset
, unsigned int *classes
)
2427 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2435 rc
= do_probe_reset(ap
, hardreset
, postreset
, classes
);
2436 if (rc
== 0 || rc
!= -ENODEV
)
2440 rc
= do_probe_reset(ap
, softreset
, postreset
, classes
);
2446 * ata_dev_same_device - Determine whether new ID matches configured device
2447 * @ap: port on which the device to compare against resides
2448 * @dev: device to compare against
2449 * @new_class: class of the new device
2450 * @new_id: IDENTIFY page of the new device
2452 * Compare @new_class and @new_id against @dev and determine
2453 * whether @dev is the device indicated by @new_class and
2460 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2462 static int ata_dev_same_device(struct ata_port
*ap
, struct ata_device
*dev
,
2463 unsigned int new_class
, const u16
*new_id
)
2465 const u16
*old_id
= dev
->id
;
2466 unsigned char model
[2][41], serial
[2][21];
2469 if (dev
->class != new_class
) {
2471 "ata%u: dev %u class mismatch %d != %d\n",
2472 ap
->id
, dev
->devno
, dev
->class, new_class
);
2476 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2477 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2478 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2479 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2480 new_n_sectors
= ata_id_n_sectors(new_id
);
2482 if (strcmp(model
[0], model
[1])) {
2484 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2485 ap
->id
, dev
->devno
, model
[0], model
[1]);
2489 if (strcmp(serial
[0], serial
[1])) {
2491 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2492 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2496 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2498 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2499 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2500 (unsigned long long)new_n_sectors
);
2508 * ata_dev_revalidate - Revalidate ATA device
2509 * @ap: port on which the device to revalidate resides
2510 * @dev: device to revalidate
2511 * @post_reset: is this revalidation after reset?
2513 * Re-read IDENTIFY page and make sure @dev is still attached to
2517 * Kernel thread context (may sleep)
2520 * 0 on success, negative errno otherwise
2522 int ata_dev_revalidate(struct ata_port
*ap
, struct ata_device
*dev
,
2529 if (!ata_dev_present(dev
))
2535 /* allocate & read ID data */
2536 rc
= ata_dev_read_id(ap
, dev
, &class, post_reset
, &id
);
2540 /* is the device still there? */
2541 if (!ata_dev_same_device(ap
, dev
, class, id
)) {
2549 /* configure device according to the new ID */
2550 return ata_dev_configure(ap
, dev
, 0);
2553 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2554 ap
->id
, dev
->devno
, rc
);
2559 static const char * const ata_dma_blacklist
[] = {
2578 "Toshiba CD-ROM XM-6202B",
2579 "TOSHIBA CD-ROM XM-1702BC",
2581 "E-IDE CD-ROM CR-840",
2584 "SAMSUNG CD-ROM SC-148C",
2585 "SAMSUNG CD-ROM SC",
2587 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2591 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2593 unsigned char model_num
[41];
2596 ata_id_c_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
, sizeof(model_num
));
2598 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2599 if (!strcmp(ata_dma_blacklist
[i
], model_num
))
2606 * ata_dev_xfermask - Compute supported xfermask of the given device
2607 * @ap: Port on which the device to compute xfermask for resides
2608 * @dev: Device to compute xfermask for
2610 * Compute supported xfermask of @dev. This function is
2611 * responsible for applying all known limits including host
2612 * controller limits, device blacklist, etc...
2618 * Computed xfermask.
2620 static unsigned int ata_dev_xfermask(struct ata_port
*ap
,
2621 struct ata_device
*dev
)
2623 unsigned long xfer_mask
;
2626 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
, ap
->mwdma_mask
,
2629 /* use port-wide xfermask for now */
2630 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2631 struct ata_device
*d
= &ap
->device
[i
];
2632 if (!ata_dev_present(d
))
2634 xfer_mask
&= ata_id_xfermask(d
->id
);
2635 if (ata_dma_blacklisted(d
))
2636 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2639 if (ata_dma_blacklisted(dev
))
2640 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, "
2641 "disabling DMA\n", ap
->id
, dev
->devno
);
2647 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2648 * @ap: Port associated with device @dev
2649 * @dev: Device to which command will be sent
2651 * Issue SET FEATURES - XFER MODE command to device @dev
2655 * PCI/etc. bus probe sem.
2658 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2660 struct ata_taskfile tf
;
2662 /* set up set-features taskfile */
2663 DPRINTK("set features - xfer mode\n");
2665 ata_tf_init(ap
, &tf
, dev
->devno
);
2666 tf
.command
= ATA_CMD_SET_FEATURES
;
2667 tf
.feature
= SETFEATURES_XFER
;
2668 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2669 tf
.protocol
= ATA_PROT_NODATA
;
2670 tf
.nsect
= dev
->xfer_mode
;
2672 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2673 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2675 ata_port_disable(ap
);
2682 * ata_dev_init_params - Issue INIT DEV PARAMS command
2683 * @ap: Port associated with device @dev
2684 * @dev: Device to which command will be sent
2687 * Kernel thread context (may sleep)
2690 * 0 on success, AC_ERR_* mask otherwise.
2693 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
2694 struct ata_device
*dev
)
2696 struct ata_taskfile tf
;
2697 unsigned int err_mask
;
2698 u16 sectors
= dev
->id
[6];
2699 u16 heads
= dev
->id
[3];
2701 /* Number of sectors per track 1-255. Number of heads 1-16 */
2702 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2705 /* set up init dev params taskfile */
2706 DPRINTK("init dev params \n");
2708 ata_tf_init(ap
, &tf
, dev
->devno
);
2709 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2710 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2711 tf
.protocol
= ATA_PROT_NODATA
;
2713 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2715 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2717 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2722 * ata_sg_clean - Unmap DMA memory associated with command
2723 * @qc: Command containing DMA memory to be released
2725 * Unmap all mapped DMA memory associated with this command.
2728 * spin_lock_irqsave(host_set lock)
2731 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2733 struct ata_port
*ap
= qc
->ap
;
2734 struct scatterlist
*sg
= qc
->__sg
;
2735 int dir
= qc
->dma_dir
;
2736 void *pad_buf
= NULL
;
2738 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
2739 WARN_ON(sg
== NULL
);
2741 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2742 WARN_ON(qc
->n_elem
> 1);
2744 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2746 /* if we padded the buffer out to 32-bit bound, and data
2747 * xfer direction is from-device, we must copy from the
2748 * pad buffer back into the supplied buffer
2750 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2751 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2753 if (qc
->flags
& ATA_QCFLAG_SG
) {
2755 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2756 /* restore last sg */
2757 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2759 struct scatterlist
*psg
= &qc
->pad_sgent
;
2760 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2761 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2762 kunmap_atomic(addr
, KM_IRQ0
);
2766 dma_unmap_single(ap
->host_set
->dev
,
2767 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2770 sg
->length
+= qc
->pad_len
;
2772 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2773 pad_buf
, qc
->pad_len
);
2776 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2781 * ata_fill_sg - Fill PCI IDE PRD table
2782 * @qc: Metadata associated with taskfile to be transferred
2784 * Fill PCI IDE PRD (scatter-gather) table with segments
2785 * associated with the current disk command.
2788 * spin_lock_irqsave(host_set lock)
2791 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2793 struct ata_port
*ap
= qc
->ap
;
2794 struct scatterlist
*sg
;
2797 WARN_ON(qc
->__sg
== NULL
);
2798 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
2801 ata_for_each_sg(sg
, qc
) {
2805 /* determine if physical DMA addr spans 64K boundary.
2806 * Note h/w doesn't support 64-bit, so we unconditionally
2807 * truncate dma_addr_t to u32.
2809 addr
= (u32
) sg_dma_address(sg
);
2810 sg_len
= sg_dma_len(sg
);
2813 offset
= addr
& 0xffff;
2815 if ((offset
+ sg_len
) > 0x10000)
2816 len
= 0x10000 - offset
;
2818 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2819 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2820 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2829 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2832 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2833 * @qc: Metadata associated with taskfile to check
2835 * Allow low-level driver to filter ATA PACKET commands, returning
2836 * a status indicating whether or not it is OK to use DMA for the
2837 * supplied PACKET command.
2840 * spin_lock_irqsave(host_set lock)
2842 * RETURNS: 0 when ATAPI DMA can be used
2845 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2847 struct ata_port
*ap
= qc
->ap
;
2848 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2850 if (ap
->ops
->check_atapi_dma
)
2851 rc
= ap
->ops
->check_atapi_dma(qc
);
2856 * ata_qc_prep - Prepare taskfile for submission
2857 * @qc: Metadata associated with taskfile to be prepared
2859 * Prepare ATA taskfile for submission.
2862 * spin_lock_irqsave(host_set lock)
2864 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2866 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2873 * ata_sg_init_one - Associate command with memory buffer
2874 * @qc: Command to be associated
2875 * @buf: Memory buffer
2876 * @buflen: Length of memory buffer, in bytes.
2878 * Initialize the data-related elements of queued_cmd @qc
2879 * to point to a single memory buffer, @buf of byte length @buflen.
2882 * spin_lock_irqsave(host_set lock)
2885 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2887 struct scatterlist
*sg
;
2889 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2891 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2892 qc
->__sg
= &qc
->sgent
;
2894 qc
->orig_n_elem
= 1;
2898 sg_init_one(sg
, buf
, buflen
);
2902 * ata_sg_init - Associate command with scatter-gather table.
2903 * @qc: Command to be associated
2904 * @sg: Scatter-gather table.
2905 * @n_elem: Number of elements in s/g table.
2907 * Initialize the data-related elements of queued_cmd @qc
2908 * to point to a scatter-gather table @sg, containing @n_elem
2912 * spin_lock_irqsave(host_set lock)
2915 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2916 unsigned int n_elem
)
2918 qc
->flags
|= ATA_QCFLAG_SG
;
2920 qc
->n_elem
= n_elem
;
2921 qc
->orig_n_elem
= n_elem
;
2925 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2926 * @qc: Command with memory buffer to be mapped.
2928 * DMA-map the memory buffer associated with queued_cmd @qc.
2931 * spin_lock_irqsave(host_set lock)
2934 * Zero on success, negative on error.
2937 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2939 struct ata_port
*ap
= qc
->ap
;
2940 int dir
= qc
->dma_dir
;
2941 struct scatterlist
*sg
= qc
->__sg
;
2942 dma_addr_t dma_address
;
2945 /* we must lengthen transfers to end on a 32-bit boundary */
2946 qc
->pad_len
= sg
->length
& 3;
2948 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2949 struct scatterlist
*psg
= &qc
->pad_sgent
;
2951 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
2953 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2955 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2956 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2959 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2960 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2962 sg
->length
-= qc
->pad_len
;
2963 if (sg
->length
== 0)
2966 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2967 sg
->length
, qc
->pad_len
);
2975 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2977 if (dma_mapping_error(dma_address
)) {
2979 sg
->length
+= qc
->pad_len
;
2983 sg_dma_address(sg
) = dma_address
;
2984 sg_dma_len(sg
) = sg
->length
;
2987 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2988 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2994 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2995 * @qc: Command with scatter-gather table to be mapped.
2997 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3000 * spin_lock_irqsave(host_set lock)
3003 * Zero on success, negative on error.
3007 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3009 struct ata_port
*ap
= qc
->ap
;
3010 struct scatterlist
*sg
= qc
->__sg
;
3011 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3012 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3014 VPRINTK("ENTER, ata%u\n", ap
->id
);
3015 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3017 /* we must lengthen transfers to end on a 32-bit boundary */
3018 qc
->pad_len
= lsg
->length
& 3;
3020 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3021 struct scatterlist
*psg
= &qc
->pad_sgent
;
3022 unsigned int offset
;
3024 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3026 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3029 * psg->page/offset are used to copy to-be-written
3030 * data in this function or read data in ata_sg_clean.
3032 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3033 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3034 psg
->offset
= offset_in_page(offset
);
3036 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3037 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3038 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3039 kunmap_atomic(addr
, KM_IRQ0
);
3042 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3043 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3045 lsg
->length
-= qc
->pad_len
;
3046 if (lsg
->length
== 0)
3049 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3050 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3053 pre_n_elem
= qc
->n_elem
;
3054 if (trim_sg
&& pre_n_elem
)
3063 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
3065 /* restore last sg */
3066 lsg
->length
+= qc
->pad_len
;
3070 DPRINTK("%d sg elements mapped\n", n_elem
);
3073 qc
->n_elem
= n_elem
;
3079 * ata_poll_qc_complete - turn irq back on and finish qc
3080 * @qc: Command to complete
3081 * @err_mask: ATA status register content
3084 * None. (grabs host lock)
3087 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3089 struct ata_port
*ap
= qc
->ap
;
3090 unsigned long flags
;
3092 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3094 ata_qc_complete(qc
);
3095 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3099 * ata_pio_poll - poll using PIO, depending on current state
3100 * @ap: the target ata_port
3103 * None. (executing in kernel thread context)
3106 * timeout value to use
3109 static unsigned long ata_pio_poll(struct ata_port
*ap
)
3111 struct ata_queued_cmd
*qc
;
3113 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3114 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3116 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3117 WARN_ON(qc
== NULL
);
3119 switch (ap
->hsm_task_state
) {
3122 poll_state
= HSM_ST_POLL
;
3126 case HSM_ST_LAST_POLL
:
3127 poll_state
= HSM_ST_LAST_POLL
;
3128 reg_state
= HSM_ST_LAST
;
3135 status
= ata_chk_status(ap
);
3136 if (status
& ATA_BUSY
) {
3137 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3138 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3139 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3142 ap
->hsm_task_state
= poll_state
;
3143 return ATA_SHORT_PAUSE
;
3146 ap
->hsm_task_state
= reg_state
;
3151 * ata_pio_complete - check if drive is busy or idle
3152 * @ap: the target ata_port
3155 * None. (executing in kernel thread context)
3158 * Zero if qc completed.
3159 * Non-zero if has next.
3162 static int ata_pio_complete (struct ata_port
*ap
)
3164 struct ata_queued_cmd
*qc
;
3168 * This is purely heuristic. This is a fast path. Sometimes when
3169 * we enter, BSY will be cleared in a chk-status or two. If not,
3170 * the drive is probably seeking or something. Snooze for a couple
3171 * msecs, then chk-status again. If still busy, fall back to
3172 * HSM_ST_LAST_POLL state.
3174 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3175 if (drv_stat
& ATA_BUSY
) {
3177 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3178 if (drv_stat
& ATA_BUSY
) {
3179 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3180 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3185 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3186 WARN_ON(qc
== NULL
);
3188 drv_stat
= ata_wait_idle(ap
);
3189 if (!ata_ok(drv_stat
)) {
3190 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3191 ap
->hsm_task_state
= HSM_ST_ERR
;
3195 ap
->hsm_task_state
= HSM_ST_IDLE
;
3197 WARN_ON(qc
->err_mask
);
3198 ata_poll_qc_complete(qc
);
3200 /* another command may start at this point */
3207 * swap_buf_le16 - swap halves of 16-bit words in place
3208 * @buf: Buffer to swap
3209 * @buf_words: Number of 16-bit words in buffer.
3211 * Swap halves of 16-bit words if needed to convert from
3212 * little-endian byte order to native cpu byte order, or
3216 * Inherited from caller.
3218 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3223 for (i
= 0; i
< buf_words
; i
++)
3224 buf
[i
] = le16_to_cpu(buf
[i
]);
3225 #endif /* __BIG_ENDIAN */
3229 * ata_mmio_data_xfer - Transfer data by MMIO
3230 * @ap: port to read/write
3232 * @buflen: buffer length
3233 * @write_data: read/write
3235 * Transfer data from/to the device data register by MMIO.
3238 * Inherited from caller.
3241 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3242 unsigned int buflen
, int write_data
)
3245 unsigned int words
= buflen
>> 1;
3246 u16
*buf16
= (u16
*) buf
;
3247 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3249 /* Transfer multiple of 2 bytes */
3251 for (i
= 0; i
< words
; i
++)
3252 writew(le16_to_cpu(buf16
[i
]), mmio
);
3254 for (i
= 0; i
< words
; i
++)
3255 buf16
[i
] = cpu_to_le16(readw(mmio
));
3258 /* Transfer trailing 1 byte, if any. */
3259 if (unlikely(buflen
& 0x01)) {
3260 u16 align_buf
[1] = { 0 };
3261 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3264 memcpy(align_buf
, trailing_buf
, 1);
3265 writew(le16_to_cpu(align_buf
[0]), mmio
);
3267 align_buf
[0] = cpu_to_le16(readw(mmio
));
3268 memcpy(trailing_buf
, align_buf
, 1);
3274 * ata_pio_data_xfer - Transfer data by PIO
3275 * @ap: port to read/write
3277 * @buflen: buffer length
3278 * @write_data: read/write
3280 * Transfer data from/to the device data register by PIO.
3283 * Inherited from caller.
3286 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3287 unsigned int buflen
, int write_data
)
3289 unsigned int words
= buflen
>> 1;
3291 /* Transfer multiple of 2 bytes */
3293 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3295 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3297 /* Transfer trailing 1 byte, if any. */
3298 if (unlikely(buflen
& 0x01)) {
3299 u16 align_buf
[1] = { 0 };
3300 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3303 memcpy(align_buf
, trailing_buf
, 1);
3304 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3306 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3307 memcpy(trailing_buf
, align_buf
, 1);
3313 * ata_data_xfer - Transfer data from/to the data register.
3314 * @ap: port to read/write
3316 * @buflen: buffer length
3317 * @do_write: read/write
3319 * Transfer data from/to the device data register.
3322 * Inherited from caller.
3325 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3326 unsigned int buflen
, int do_write
)
3328 /* Make the crap hardware pay the costs not the good stuff */
3329 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3330 unsigned long flags
;
3331 local_irq_save(flags
);
3332 if (ap
->flags
& ATA_FLAG_MMIO
)
3333 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3335 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3336 local_irq_restore(flags
);
3338 if (ap
->flags
& ATA_FLAG_MMIO
)
3339 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3341 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3346 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3347 * @qc: Command on going
3349 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3352 * Inherited from caller.
3355 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3357 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3358 struct scatterlist
*sg
= qc
->__sg
;
3359 struct ata_port
*ap
= qc
->ap
;
3361 unsigned int offset
;
3364 if (qc
->cursect
== (qc
->nsect
- 1))
3365 ap
->hsm_task_state
= HSM_ST_LAST
;
3367 page
= sg
[qc
->cursg
].page
;
3368 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3370 /* get the current page and offset */
3371 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3372 offset
%= PAGE_SIZE
;
3374 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3376 if (PageHighMem(page
)) {
3377 unsigned long flags
;
3379 local_irq_save(flags
);
3380 buf
= kmap_atomic(page
, KM_IRQ0
);
3382 /* do the actual data transfer */
3383 ata_data_xfer(ap
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3385 kunmap_atomic(buf
, KM_IRQ0
);
3386 local_irq_restore(flags
);
3388 buf
= page_address(page
);
3389 ata_data_xfer(ap
, buf
+ offset
, ATA_SECT_SIZE
, do_write
);
3395 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3402 * ata_pio_sectors - Transfer one or many 512-byte sectors.
3403 * @qc: Command on going
3405 * Transfer one or many ATA_SECT_SIZE of data from/to the
3406 * ATA device for the DRQ request.
3409 * Inherited from caller.
3412 static void ata_pio_sectors(struct ata_queued_cmd
*qc
)
3414 if (is_multi_taskfile(&qc
->tf
)) {
3415 /* READ/WRITE MULTIPLE */
3418 WARN_ON(qc
->dev
->multi_count
== 0);
3420 nsect
= min(qc
->nsect
- qc
->cursect
, qc
->dev
->multi_count
);
3428 * atapi_send_cdb - Write CDB bytes to hardware
3429 * @ap: Port to which ATAPI device is attached.
3430 * @qc: Taskfile currently active
3432 * When device has indicated its readiness to accept
3433 * a CDB, this function is called. Send the CDB.
3439 static void atapi_send_cdb(struct ata_port
*ap
, struct ata_queued_cmd
*qc
)
3442 DPRINTK("send cdb\n");
3443 WARN_ON(qc
->dev
->cdb_len
< 12);
3445 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3446 ata_altstatus(ap
); /* flush */
3448 switch (qc
->tf
.protocol
) {
3449 case ATA_PROT_ATAPI
:
3450 ap
->hsm_task_state
= HSM_ST
;
3452 case ATA_PROT_ATAPI_NODATA
:
3453 ap
->hsm_task_state
= HSM_ST_LAST
;
3455 case ATA_PROT_ATAPI_DMA
:
3456 ap
->hsm_task_state
= HSM_ST_LAST
;
3457 /* initiate bmdma */
3458 ap
->ops
->bmdma_start(qc
);
3464 * ata_pio_first_block - Write first data block to hardware
3465 * @ap: Port to which ATA/ATAPI device is attached.
3467 * When device has indicated its readiness to accept
3468 * the data, this function sends out the CDB or
3469 * the first data block by PIO.
3471 * - If polling, ata_pio_task() handles the rest.
3472 * - Otherwise, interrupt handler takes over.
3475 * Kernel thread context (may sleep)
3478 * Zero if irq handler takes over
3479 * Non-zero if has next (polling).
3482 static int ata_pio_first_block(struct ata_port
*ap
)
3484 struct ata_queued_cmd
*qc
;
3486 unsigned long flags
;
3489 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3490 WARN_ON(qc
== NULL
);
3491 WARN_ON((qc
->flags
& ATA_QCFLAG_ACTIVE
) == 0);
3493 /* if polling, we will stay in the work queue after sending the data.
3494 * otherwise, interrupt handler takes over after sending the data.
3496 has_next
= (qc
->tf
.flags
& ATA_TFLAG_POLLING
);
3498 /* sleep-wait for BSY to clear */
3499 DPRINTK("busy wait\n");
3500 if (ata_busy_sleep(ap
, ATA_TMOUT_DATAOUT_QUICK
, ATA_TMOUT_DATAOUT
)) {
3501 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3502 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3506 /* make sure DRQ is set */
3507 status
= ata_chk_status(ap
);
3508 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3509 /* device status error */
3510 qc
->err_mask
|= AC_ERR_HSM
;
3511 ap
->hsm_task_state
= HSM_ST_ERR
;
3515 /* Send the CDB (atapi) or the first data block (ata pio out).
3516 * During the state transition, interrupt handler shouldn't
3517 * be invoked before the data transfer is complete and
3518 * hsm_task_state is changed. Hence, the following locking.
3520 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3522 if (qc
->tf
.protocol
== ATA_PROT_PIO
) {
3523 /* PIO data out protocol.
3524 * send first data block.
3527 /* ata_pio_sectors() might change the state to HSM_ST_LAST.
3528 * so, the state is changed here before ata_pio_sectors().
3530 ap
->hsm_task_state
= HSM_ST
;
3531 ata_pio_sectors(qc
);
3532 ata_altstatus(ap
); /* flush */
3535 atapi_send_cdb(ap
, qc
);
3537 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3539 /* if polling, ata_pio_task() handles the rest.
3540 * otherwise, interrupt handler takes over from here.
3545 return 1; /* has next */
3549 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3550 * @qc: Command on going
3551 * @bytes: number of bytes
3553 * Transfer Transfer data from/to the ATAPI device.
3556 * Inherited from caller.
3560 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3562 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3563 struct scatterlist
*sg
= qc
->__sg
;
3564 struct ata_port
*ap
= qc
->ap
;
3567 unsigned int offset
, count
;
3569 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3570 ap
->hsm_task_state
= HSM_ST_LAST
;
3573 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3575 * The end of qc->sg is reached and the device expects
3576 * more data to transfer. In order not to overrun qc->sg
3577 * and fulfill length specified in the byte count register,
3578 * - for read case, discard trailing data from the device
3579 * - for write case, padding zero data to the device
3581 u16 pad_buf
[1] = { 0 };
3582 unsigned int words
= bytes
>> 1;
3585 if (words
) /* warning if bytes > 1 */
3586 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3589 for (i
= 0; i
< words
; i
++)
3590 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3592 ap
->hsm_task_state
= HSM_ST_LAST
;
3596 sg
= &qc
->__sg
[qc
->cursg
];
3599 offset
= sg
->offset
+ qc
->cursg_ofs
;
3601 /* get the current page and offset */
3602 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3603 offset
%= PAGE_SIZE
;
3605 /* don't overrun current sg */
3606 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3608 /* don't cross page boundaries */
3609 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3611 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3613 if (PageHighMem(page
)) {
3614 unsigned long flags
;
3616 local_irq_save(flags
);
3617 buf
= kmap_atomic(page
, KM_IRQ0
);
3619 /* do the actual data transfer */
3620 ata_data_xfer(ap
, buf
+ offset
, count
, do_write
);
3622 kunmap_atomic(buf
, KM_IRQ0
);
3623 local_irq_restore(flags
);
3625 buf
= page_address(page
);
3626 ata_data_xfer(ap
, buf
+ offset
, count
, do_write
);
3630 qc
->curbytes
+= count
;
3631 qc
->cursg_ofs
+= count
;
3633 if (qc
->cursg_ofs
== sg
->length
) {
3643 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3644 * @qc: Command on going
3646 * Transfer Transfer data from/to the ATAPI device.
3649 * Inherited from caller.
3652 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3654 struct ata_port
*ap
= qc
->ap
;
3655 struct ata_device
*dev
= qc
->dev
;
3656 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3657 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3659 ap
->ops
->tf_read(ap
, &qc
->tf
);
3660 ireason
= qc
->tf
.nsect
;
3661 bc_lo
= qc
->tf
.lbam
;
3662 bc_hi
= qc
->tf
.lbah
;
3663 bytes
= (bc_hi
<< 8) | bc_lo
;
3665 /* shall be cleared to zero, indicating xfer of data */
3666 if (ireason
& (1 << 0))
3669 /* make sure transfer direction matches expected */
3670 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3671 if (do_write
!= i_write
)
3674 VPRINTK("ata%u: xfering %d bytes\n", ap
->id
, bytes
);
3676 __atapi_pio_bytes(qc
, bytes
);
3681 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3682 ap
->id
, dev
->devno
);
3683 qc
->err_mask
|= AC_ERR_HSM
;
3684 ap
->hsm_task_state
= HSM_ST_ERR
;
3688 * ata_pio_block - start PIO on a block
3689 * @ap: the target ata_port
3692 * None. (executing in kernel thread context)
3695 static void ata_pio_block(struct ata_port
*ap
)
3697 struct ata_queued_cmd
*qc
;
3701 * This is purely heuristic. This is a fast path.
3702 * Sometimes when we enter, BSY will be cleared in
3703 * a chk-status or two. If not, the drive is probably seeking
3704 * or something. Snooze for a couple msecs, then
3705 * chk-status again. If still busy, fall back to
3706 * HSM_ST_POLL state.
3708 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3709 if (status
& ATA_BUSY
) {
3711 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3712 if (status
& ATA_BUSY
) {
3713 ap
->hsm_task_state
= HSM_ST_POLL
;
3714 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3719 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3720 WARN_ON(qc
== NULL
);
3723 if (status
& (ATA_ERR
| ATA_DF
)) {
3724 qc
->err_mask
|= AC_ERR_DEV
;
3725 ap
->hsm_task_state
= HSM_ST_ERR
;
3729 /* transfer data if any */
3730 if (is_atapi_taskfile(&qc
->tf
)) {
3731 /* DRQ=0 means no more data to transfer */
3732 if ((status
& ATA_DRQ
) == 0) {
3733 ap
->hsm_task_state
= HSM_ST_LAST
;
3737 atapi_pio_bytes(qc
);
3739 /* handle BSY=0, DRQ=0 as error */
3740 if ((status
& ATA_DRQ
) == 0) {
3741 qc
->err_mask
|= AC_ERR_HSM
;
3742 ap
->hsm_task_state
= HSM_ST_ERR
;
3746 ata_pio_sectors(qc
);
3749 ata_altstatus(ap
); /* flush */
3752 static void ata_pio_error(struct ata_port
*ap
)
3754 struct ata_queued_cmd
*qc
;
3756 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3757 WARN_ON(qc
== NULL
);
3759 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3760 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3762 /* make sure qc->err_mask is available to
3763 * know what's wrong and recover
3765 WARN_ON(qc
->err_mask
== 0);
3767 ap
->hsm_task_state
= HSM_ST_IDLE
;
3769 ata_poll_qc_complete(qc
);
3772 static void ata_pio_task(void *_data
)
3774 struct ata_port
*ap
= _data
;
3775 unsigned long timeout
;
3782 switch (ap
->hsm_task_state
) {
3784 has_next
= ata_pio_first_block(ap
);
3792 has_next
= ata_pio_complete(ap
);
3796 case HSM_ST_LAST_POLL
:
3797 timeout
= ata_pio_poll(ap
);
3811 ata_port_queue_task(ap
, ata_pio_task
, ap
, timeout
);
3812 else if (!qc_completed
)
3817 * atapi_packet_task - Write CDB bytes to hardware
3818 * @_data: Port to which ATAPI device is attached.
3820 * When device has indicated its readiness to accept
3821 * a CDB, this function is called. Send the CDB.
3822 * If DMA is to be performed, exit immediately.
3823 * Otherwise, we are in polling mode, so poll
3824 * status under operation succeeds or fails.
3827 * Kernel thread context (may sleep)
3830 static void atapi_packet_task(void *_data
)
3832 struct ata_port
*ap
= _data
;
3833 struct ata_queued_cmd
*qc
;
3836 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3837 WARN_ON(qc
== NULL
);
3838 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3840 /* sleep-wait for BSY to clear */
3841 DPRINTK("busy wait\n");
3842 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3843 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3847 /* make sure DRQ is set */
3848 status
= ata_chk_status(ap
);
3849 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3850 qc
->err_mask
|= AC_ERR_HSM
;
3855 DPRINTK("send cdb\n");
3856 WARN_ON(qc
->dev
->cdb_len
< 12);
3858 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
3859 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
3860 unsigned long flags
;
3862 /* Once we're done issuing command and kicking bmdma,
3863 * irq handler takes over. To not lose irq, we need
3864 * to clear NOINTR flag before sending cdb, but
3865 * interrupt handler shouldn't be invoked before we're
3866 * finished. Hence, the following locking.
3868 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3869 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3870 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3871 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
3872 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3873 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3875 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3877 /* PIO commands are handled by polling */
3878 ap
->hsm_task_state
= HSM_ST
;
3879 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
3885 ata_poll_qc_complete(qc
);
3889 * ata_qc_timeout - Handle timeout of queued command
3890 * @qc: Command that timed out
3892 * Some part of the kernel (currently, only the SCSI layer)
3893 * has noticed that the active command on port @ap has not
3894 * completed after a specified length of time. Handle this
3895 * condition by disabling DMA (if necessary) and completing
3896 * transactions, with error if necessary.
3898 * This also handles the case of the "lost interrupt", where
3899 * for some reason (possibly hardware bug, possibly driver bug)
3900 * an interrupt was not delivered to the driver, even though the
3901 * transaction completed successfully.
3904 * Inherited from SCSI layer (none, can sleep)
3907 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3909 struct ata_port
*ap
= qc
->ap
;
3910 struct ata_host_set
*host_set
= ap
->host_set
;
3911 u8 host_stat
= 0, drv_stat
;
3912 unsigned long flags
;
3916 ap
->hsm_task_state
= HSM_ST_IDLE
;
3918 spin_lock_irqsave(&host_set
->lock
, flags
);
3920 switch (qc
->tf
.protocol
) {
3923 case ATA_PROT_ATAPI_DMA
:
3924 host_stat
= ap
->ops
->bmdma_status(ap
);
3926 /* before we do anything else, clear DMA-Start bit */
3927 ap
->ops
->bmdma_stop(qc
);
3933 drv_stat
= ata_chk_status(ap
);
3935 /* ack bmdma irq events */
3936 ap
->ops
->irq_clear(ap
);
3938 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3939 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3941 ap
->hsm_task_state
= HSM_ST_IDLE
;
3943 /* complete taskfile transaction */
3944 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3948 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3950 ata_eh_qc_complete(qc
);
3956 * ata_eng_timeout - Handle timeout of queued command
3957 * @ap: Port on which timed-out command is active
3959 * Some part of the kernel (currently, only the SCSI layer)
3960 * has noticed that the active command on port @ap has not
3961 * completed after a specified length of time. Handle this
3962 * condition by disabling DMA (if necessary) and completing
3963 * transactions, with error if necessary.
3965 * This also handles the case of the "lost interrupt", where
3966 * for some reason (possibly hardware bug, possibly driver bug)
3967 * an interrupt was not delivered to the driver, even though the
3968 * transaction completed successfully.
3971 * Inherited from SCSI layer (none, can sleep)
3974 void ata_eng_timeout(struct ata_port
*ap
)
3978 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
3984 * ata_qc_new - Request an available ATA command, for queueing
3985 * @ap: Port associated with device @dev
3986 * @dev: Device from whom we request an available command structure
3992 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3994 struct ata_queued_cmd
*qc
= NULL
;
3997 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3998 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3999 qc
= ata_qc_from_tag(ap
, i
);
4010 * ata_qc_new_init - Request an available ATA command, and initialize it
4011 * @ap: Port associated with device @dev
4012 * @dev: Device from whom we request an available command structure
4018 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
4019 struct ata_device
*dev
)
4021 struct ata_queued_cmd
*qc
;
4023 qc
= ata_qc_new(ap
);
4036 * ata_qc_free - free unused ata_queued_cmd
4037 * @qc: Command to complete
4039 * Designed to free unused ata_queued_cmd object
4040 * in case something prevents using it.
4043 * spin_lock_irqsave(host_set lock)
4045 void ata_qc_free(struct ata_queued_cmd
*qc
)
4047 struct ata_port
*ap
= qc
->ap
;
4050 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4054 if (likely(ata_tag_valid(tag
))) {
4055 if (tag
== ap
->active_tag
)
4056 ap
->active_tag
= ATA_TAG_POISON
;
4057 qc
->tag
= ATA_TAG_POISON
;
4058 clear_bit(tag
, &ap
->qactive
);
4062 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4064 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4065 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4067 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4070 /* atapi: mark qc as inactive to prevent the interrupt handler
4071 * from completing the command twice later, before the error handler
4072 * is called. (when rc != 0 and atapi request sense is needed)
4074 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4076 /* call completion callback */
4077 qc
->complete_fn(qc
);
4080 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4082 struct ata_port
*ap
= qc
->ap
;
4084 switch (qc
->tf
.protocol
) {
4086 case ATA_PROT_ATAPI_DMA
:
4089 case ATA_PROT_ATAPI
:
4091 case ATA_PROT_PIO_MULT
:
4092 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4105 * ata_qc_issue - issue taskfile to device
4106 * @qc: command to issue to device
4108 * Prepare an ATA command to submission to device.
4109 * This includes mapping the data into a DMA-able
4110 * area, filling in the S/G table, and finally
4111 * writing the taskfile to hardware, starting the command.
4114 * spin_lock_irqsave(host_set lock)
4117 * Zero on success, AC_ERR_* mask on failure
4120 unsigned int ata_qc_issue(struct ata_queued_cmd
*qc
)
4122 struct ata_port
*ap
= qc
->ap
;
4124 if (ata_should_dma_map(qc
)) {
4125 if (qc
->flags
& ATA_QCFLAG_SG
) {
4126 if (ata_sg_setup(qc
))
4128 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4129 if (ata_sg_setup_one(qc
))
4133 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4136 ap
->ops
->qc_prep(qc
);
4138 qc
->ap
->active_tag
= qc
->tag
;
4139 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4141 return ap
->ops
->qc_issue(qc
);
4144 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4145 return AC_ERR_SYSTEM
;
4150 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4151 * @qc: command to issue to device
4153 * Using various libata functions and hooks, this function
4154 * starts an ATA command. ATA commands are grouped into
4155 * classes called "protocols", and issuing each type of protocol
4156 * is slightly different.
4158 * May be used as the qc_issue() entry in ata_port_operations.
4161 * spin_lock_irqsave(host_set lock)
4164 * Zero on success, AC_ERR_* mask on failure
4167 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4169 struct ata_port
*ap
= qc
->ap
;
4171 /* Use polling pio if the LLD doesn't handle
4172 * interrupt driven pio and atapi CDB interrupt.
4174 if (ap
->flags
& ATA_FLAG_PIO_POLLING
) {
4175 switch (qc
->tf
.protocol
) {
4177 case ATA_PROT_ATAPI
:
4178 case ATA_PROT_ATAPI_NODATA
:
4179 qc
->tf
.flags
|= ATA_TFLAG_POLLING
;
4181 case ATA_PROT_ATAPI_DMA
:
4182 if (qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)
4190 /* select the device */
4191 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4193 /* start the command */
4194 switch (qc
->tf
.protocol
) {
4195 case ATA_PROT_NODATA
:
4196 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4197 ata_qc_set_polling(qc
);
4199 ata_tf_to_host(ap
, &qc
->tf
);
4200 ap
->hsm_task_state
= HSM_ST_LAST
;
4202 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4203 ata_queue_pio_task(ap
);
4208 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4210 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4211 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4212 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4213 ap
->hsm_task_state
= HSM_ST_LAST
;
4217 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4218 ata_qc_set_polling(qc
);
4220 ata_tf_to_host(ap
, &qc
->tf
);
4222 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
4223 /* PIO data out protocol */
4224 ap
->hsm_task_state
= HSM_ST_FIRST
;
4225 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4227 /* always send first data block using
4228 * the ata_pio_task() codepath.
4231 /* PIO data in protocol */
4232 ap
->hsm_task_state
= HSM_ST
;
4234 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4235 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4237 /* if polling, ata_pio_task() handles the rest.
4238 * otherwise, interrupt handler takes over from here.
4244 case ATA_PROT_ATAPI
:
4245 case ATA_PROT_ATAPI_NODATA
:
4246 if (qc
->tf
.flags
& ATA_TFLAG_POLLING
)
4247 ata_qc_set_polling(qc
);
4249 ata_tf_to_host(ap
, &qc
->tf
);
4251 ap
->hsm_task_state
= HSM_ST_FIRST
;
4253 /* send cdb by polling if no cdb interrupt */
4254 if ((!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
)) ||
4255 (qc
->tf
.flags
& ATA_TFLAG_POLLING
))
4256 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4259 case ATA_PROT_ATAPI_DMA
:
4260 WARN_ON(qc
->tf
.flags
& ATA_TFLAG_POLLING
);
4262 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4263 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4264 ap
->hsm_task_state
= HSM_ST_FIRST
;
4266 /* send cdb by polling if no cdb interrupt */
4267 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4268 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4273 return AC_ERR_SYSTEM
;
4280 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
4281 * @qc: Info associated with this ATA transaction.
4284 * spin_lock_irqsave(host_set lock)
4287 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
4289 struct ata_port
*ap
= qc
->ap
;
4290 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
4292 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4294 /* load PRD table addr. */
4295 mb(); /* make sure PRD table writes are visible to controller */
4296 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
4298 /* specify data direction, triple-check start bit is clear */
4299 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
4300 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
4302 dmactl
|= ATA_DMA_WR
;
4303 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
4305 /* issue r/w command */
4306 ap
->ops
->exec_command(ap
, &qc
->tf
);
4310 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
4311 * @qc: Info associated with this ATA transaction.
4314 * spin_lock_irqsave(host_set lock)
4317 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
4319 struct ata_port
*ap
= qc
->ap
;
4320 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4323 /* start host DMA transaction */
4324 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
4325 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
4327 /* Strictly, one may wish to issue a readb() here, to
4328 * flush the mmio write. However, control also passes
4329 * to the hardware at this point, and it will interrupt
4330 * us when we are to resume control. So, in effect,
4331 * we don't care when the mmio write flushes.
4332 * Further, a read of the DMA status register _immediately_
4333 * following the write may not be what certain flaky hardware
4334 * is expected, so I think it is best to not add a readb()
4335 * without first all the MMIO ATA cards/mobos.
4336 * Or maybe I'm just being paranoid.
4341 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
4342 * @qc: Info associated with this ATA transaction.
4345 * spin_lock_irqsave(host_set lock)
4348 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
4350 struct ata_port
*ap
= qc
->ap
;
4351 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
4354 /* load PRD table addr. */
4355 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
4357 /* specify data direction, triple-check start bit is clear */
4358 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4359 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
4361 dmactl
|= ATA_DMA_WR
;
4362 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4364 /* issue r/w command */
4365 ap
->ops
->exec_command(ap
, &qc
->tf
);
4369 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
4370 * @qc: Info associated with this ATA transaction.
4373 * spin_lock_irqsave(host_set lock)
4376 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
4378 struct ata_port
*ap
= qc
->ap
;
4381 /* start host DMA transaction */
4382 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4383 outb(dmactl
| ATA_DMA_START
,
4384 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4389 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
4390 * @qc: Info associated with this ATA transaction.
4392 * Writes the ATA_DMA_START flag to the DMA command register.
4394 * May be used as the bmdma_start() entry in ata_port_operations.
4397 * spin_lock_irqsave(host_set lock)
4399 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
4401 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4402 ata_bmdma_start_mmio(qc
);
4404 ata_bmdma_start_pio(qc
);
4409 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
4410 * @qc: Info associated with this ATA transaction.
4412 * Writes address of PRD table to device's PRD Table Address
4413 * register, sets the DMA control register, and calls
4414 * ops->exec_command() to start the transfer.
4416 * May be used as the bmdma_setup() entry in ata_port_operations.
4419 * spin_lock_irqsave(host_set lock)
4421 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
4423 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
4424 ata_bmdma_setup_mmio(qc
);
4426 ata_bmdma_setup_pio(qc
);
4431 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
4432 * @ap: Port associated with this ATA transaction.
4434 * Clear interrupt and error flags in DMA status register.
4436 * May be used as the irq_clear() entry in ata_port_operations.
4439 * spin_lock_irqsave(host_set lock)
4442 void ata_bmdma_irq_clear(struct ata_port
*ap
)
4444 if (ap
->flags
& ATA_FLAG_MMIO
) {
4445 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
4446 writeb(readb(mmio
), mmio
);
4448 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
4449 outb(inb(addr
), addr
);
4456 * ata_bmdma_status - Read PCI IDE BMDMA status
4457 * @ap: Port associated with this ATA transaction.
4459 * Read and return BMDMA status register.
4461 * May be used as the bmdma_status() entry in ata_port_operations.
4464 * spin_lock_irqsave(host_set lock)
4467 u8
ata_bmdma_status(struct ata_port
*ap
)
4470 if (ap
->flags
& ATA_FLAG_MMIO
) {
4471 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4472 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
4474 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
4480 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4481 * @qc: Command we are ending DMA for
4483 * Clears the ATA_DMA_START flag in the dma control register
4485 * May be used as the bmdma_stop() entry in ata_port_operations.
4488 * spin_lock_irqsave(host_set lock)
4491 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
4493 struct ata_port
*ap
= qc
->ap
;
4494 if (ap
->flags
& ATA_FLAG_MMIO
) {
4495 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
4497 /* clear start/stop bit */
4498 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4499 mmio
+ ATA_DMA_CMD
);
4501 /* clear start/stop bit */
4502 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4503 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4506 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4507 ata_altstatus(ap
); /* dummy read */
4511 * ata_host_intr - Handle host interrupt for given (port, task)
4512 * @ap: Port on which interrupt arrived (possibly...)
4513 * @qc: Taskfile currently active in engine
4515 * Handle host interrupt for given queued command. Currently,
4516 * only DMA interrupts are handled. All other commands are
4517 * handled via polling with interrupts disabled (nIEN bit).
4520 * spin_lock_irqsave(host_set lock)
4523 * One if interrupt was handled, zero if not (shared irq).
4526 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4527 struct ata_queued_cmd
*qc
)
4529 u8 status
, host_stat
= 0;
4531 VPRINTK("ata%u: protocol %d task_state %d\n",
4532 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
);
4534 /* Check whether we are expecting interrupt in this state */
4535 switch (ap
->hsm_task_state
) {
4537 /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
4538 * The flag was turned on only for atapi devices.
4539 * No need to check is_atapi_taskfile(&qc->tf) again.
4541 if (!(qc
->dev
->flags
& ATA_DFLAG_CDB_INTR
))
4545 if (qc
->tf
.protocol
== ATA_PROT_DMA
||
4546 qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
) {
4547 /* check status of DMA engine */
4548 host_stat
= ap
->ops
->bmdma_status(ap
);
4549 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4551 /* if it's not our irq... */
4552 if (!(host_stat
& ATA_DMA_INTR
))
4555 /* before we do anything else, clear DMA-Start bit */
4556 ap
->ops
->bmdma_stop(qc
);
4558 if (unlikely(host_stat
& ATA_DMA_ERR
)) {
4559 /* error when transfering data to/from memory */
4560 qc
->err_mask
|= AC_ERR_HOST_BUS
;
4561 ap
->hsm_task_state
= HSM_ST_ERR
;
4571 /* check altstatus */
4572 status
= ata_altstatus(ap
);
4573 if (status
& ATA_BUSY
)
4576 /* check main status, clearing INTRQ */
4577 status
= ata_chk_status(ap
);
4578 if (unlikely(status
& ATA_BUSY
))
4581 DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
4582 ap
->id
, qc
->tf
.protocol
, ap
->hsm_task_state
, status
);
4584 /* ack bmdma irq events */
4585 ap
->ops
->irq_clear(ap
);
4588 if (unlikely(status
& (ATA_ERR
| ATA_DF
))) {
4589 qc
->err_mask
|= AC_ERR_DEV
;
4590 ap
->hsm_task_state
= HSM_ST_ERR
;
4594 switch (ap
->hsm_task_state
) {
4596 /* Some pre-ATAPI-4 devices assert INTRQ
4597 * at this state when ready to receive CDB.
4600 /* check device status */
4601 if (unlikely((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
)) {
4602 /* Wrong status. Let EH handle this */
4603 qc
->err_mask
|= AC_ERR_HSM
;
4604 ap
->hsm_task_state
= HSM_ST_ERR
;
4608 atapi_send_cdb(ap
, qc
);
4613 /* complete command or read/write the data register */
4614 if (qc
->tf
.protocol
== ATA_PROT_ATAPI
) {
4615 /* ATAPI PIO protocol */
4616 if ((status
& ATA_DRQ
) == 0) {
4617 /* no more data to transfer */
4618 ap
->hsm_task_state
= HSM_ST_LAST
;
4622 atapi_pio_bytes(qc
);
4624 if (unlikely(ap
->hsm_task_state
== HSM_ST_ERR
))
4625 /* bad ireason reported by device */
4629 /* ATA PIO protocol */
4630 if (unlikely((status
& ATA_DRQ
) == 0)) {
4631 /* handle BSY=0, DRQ=0 as error */
4632 qc
->err_mask
|= AC_ERR_HSM
;
4633 ap
->hsm_task_state
= HSM_ST_ERR
;
4637 ata_pio_sectors(qc
);
4639 if (ap
->hsm_task_state
== HSM_ST_LAST
&&
4640 (!(qc
->tf
.flags
& ATA_TFLAG_WRITE
))) {
4643 status
= ata_chk_status(ap
);
4648 ata_altstatus(ap
); /* flush */
4652 if (unlikely(status
& ATA_DRQ
)) {
4653 /* handle DRQ=1 as error */
4654 qc
->err_mask
|= AC_ERR_HSM
;
4655 ap
->hsm_task_state
= HSM_ST_ERR
;
4659 /* no more data to transfer */
4660 DPRINTK("ata%u: command complete, drv_stat 0x%x\n",
4663 ap
->hsm_task_state
= HSM_ST_IDLE
;
4665 /* complete taskfile transaction */
4666 qc
->err_mask
|= ac_err_mask(status
);
4667 ata_qc_complete(qc
);
4671 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
4672 printk(KERN_ERR
"ata%u: command error, drv_stat 0x%x host_stat 0x%x\n",
4673 ap
->id
, status
, host_stat
);
4675 /* make sure qc->err_mask is available to
4676 * know what's wrong and recover
4678 WARN_ON(qc
->err_mask
== 0);
4680 ap
->hsm_task_state
= HSM_ST_IDLE
;
4681 ata_qc_complete(qc
);
4687 return 1; /* irq handled */
4690 ap
->stats
.idle_irq
++;
4693 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4695 ata_irq_ack(ap
, 0); /* debug trap */
4696 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4699 return 0; /* irq not handled */
4703 * ata_interrupt - Default ATA host interrupt handler
4704 * @irq: irq line (unused)
4705 * @dev_instance: pointer to our ata_host_set information structure
4708 * Default interrupt handler for PCI IDE devices. Calls
4709 * ata_host_intr() for each port that is not disabled.
4712 * Obtains host_set lock during operation.
4715 * IRQ_NONE or IRQ_HANDLED.
4718 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4720 struct ata_host_set
*host_set
= dev_instance
;
4722 unsigned int handled
= 0;
4723 unsigned long flags
;
4725 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4726 spin_lock_irqsave(&host_set
->lock
, flags
);
4728 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4729 struct ata_port
*ap
;
4731 ap
= host_set
->ports
[i
];
4733 !(ap
->flags
& ATA_FLAG_PORT_DISABLED
)) {
4734 struct ata_queued_cmd
*qc
;
4736 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4737 if (qc
&& (!(qc
->tf
.flags
& ATA_TFLAG_POLLING
)) &&
4738 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4739 handled
|= ata_host_intr(ap
, qc
);
4743 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4745 return IRQ_RETVAL(handled
);
4750 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4751 * without filling any other registers
4753 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4756 struct ata_taskfile tf
;
4759 ata_tf_init(ap
, &tf
, dev
->devno
);
4762 tf
.flags
|= ATA_TFLAG_DEVICE
;
4763 tf
.protocol
= ATA_PROT_NODATA
;
4765 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4767 printk(KERN_ERR
"%s: ata command failed: %d\n",
4773 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4777 if (!ata_try_flush_cache(dev
))
4780 if (ata_id_has_flush_ext(dev
->id
))
4781 cmd
= ATA_CMD_FLUSH_EXT
;
4783 cmd
= ATA_CMD_FLUSH
;
4785 return ata_do_simple_cmd(ap
, dev
, cmd
);
4788 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4790 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4793 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4795 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4799 * ata_device_resume - wakeup a previously suspended devices
4800 * @ap: port the device is connected to
4801 * @dev: the device to resume
4803 * Kick the drive back into action, by sending it an idle immediate
4804 * command and making sure its transfer mode matches between drive
4808 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4810 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4811 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4814 if (!ata_dev_present(dev
))
4816 if (dev
->class == ATA_DEV_ATA
)
4817 ata_start_drive(ap
, dev
);
4823 * ata_device_suspend - prepare a device for suspend
4824 * @ap: port the device is connected to
4825 * @dev: the device to suspend
4827 * Flush the cache on the drive, if appropriate, then issue a
4828 * standbynow command.
4830 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4832 if (!ata_dev_present(dev
))
4834 if (dev
->class == ATA_DEV_ATA
)
4835 ata_flush_cache(ap
, dev
);
4837 ata_standby_drive(ap
, dev
);
4838 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4843 * ata_port_start - Set port up for dma.
4844 * @ap: Port to initialize
4846 * Called just after data structures for each port are
4847 * initialized. Allocates space for PRD table.
4849 * May be used as the port_start() entry in ata_port_operations.
4852 * Inherited from caller.
4855 int ata_port_start (struct ata_port
*ap
)
4857 struct device
*dev
= ap
->host_set
->dev
;
4860 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4864 rc
= ata_pad_alloc(ap
, dev
);
4866 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4870 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4877 * ata_port_stop - Undo ata_port_start()
4878 * @ap: Port to shut down
4880 * Frees the PRD table.
4882 * May be used as the port_stop() entry in ata_port_operations.
4885 * Inherited from caller.
4888 void ata_port_stop (struct ata_port
*ap
)
4890 struct device
*dev
= ap
->host_set
->dev
;
4892 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4893 ata_pad_free(ap
, dev
);
4896 void ata_host_stop (struct ata_host_set
*host_set
)
4898 if (host_set
->mmio_base
)
4899 iounmap(host_set
->mmio_base
);
4904 * ata_host_remove - Unregister SCSI host structure with upper layers
4905 * @ap: Port to unregister
4906 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4909 * Inherited from caller.
4912 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4914 struct Scsi_Host
*sh
= ap
->host
;
4919 scsi_remove_host(sh
);
4921 ap
->ops
->port_stop(ap
);
4925 * ata_host_init - Initialize an ata_port structure
4926 * @ap: Structure to initialize
4927 * @host: associated SCSI mid-layer structure
4928 * @host_set: Collection of hosts to which @ap belongs
4929 * @ent: Probe information provided by low-level driver
4930 * @port_no: Port number associated with this ata_port
4932 * Initialize a new ata_port structure, and its associated
4936 * Inherited from caller.
4939 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4940 struct ata_host_set
*host_set
,
4941 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4947 host
->max_channel
= 1;
4948 host
->unique_id
= ata_unique_id
++;
4949 host
->max_cmd_len
= 12;
4951 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4952 ap
->id
= host
->unique_id
;
4954 ap
->ctl
= ATA_DEVCTL_OBS
;
4955 ap
->host_set
= host_set
;
4956 ap
->port_no
= port_no
;
4958 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4959 ap
->pio_mask
= ent
->pio_mask
;
4960 ap
->mwdma_mask
= ent
->mwdma_mask
;
4961 ap
->udma_mask
= ent
->udma_mask
;
4962 ap
->flags
|= ent
->host_flags
;
4963 ap
->ops
= ent
->port_ops
;
4964 ap
->cbl
= ATA_CBL_NONE
;
4965 ap
->active_tag
= ATA_TAG_POISON
;
4966 ap
->last_ctl
= 0xFF;
4968 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4969 INIT_LIST_HEAD(&ap
->eh_done_q
);
4971 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4972 ap
->device
[i
].devno
= i
;
4975 ap
->stats
.unhandled_irq
= 1;
4976 ap
->stats
.idle_irq
= 1;
4979 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4983 * ata_host_add - Attach low-level ATA driver to system
4984 * @ent: Information provided by low-level driver
4985 * @host_set: Collections of ports to which we add
4986 * @port_no: Port number associated with this host
4988 * Attach low-level ATA driver to system.
4991 * PCI/etc. bus probe sem.
4994 * New ata_port on success, for NULL on error.
4997 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4998 struct ata_host_set
*host_set
,
4999 unsigned int port_no
)
5001 struct Scsi_Host
*host
;
5002 struct ata_port
*ap
;
5006 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
5010 ap
= (struct ata_port
*) &host
->hostdata
[0];
5012 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
5014 rc
= ap
->ops
->port_start(ap
);
5021 scsi_host_put(host
);
5026 * ata_device_add - Register hardware device with ATA and SCSI layers
5027 * @ent: Probe information describing hardware device to be registered
5029 * This function processes the information provided in the probe
5030 * information struct @ent, allocates the necessary ATA and SCSI
5031 * host information structures, initializes them, and registers
5032 * everything with requisite kernel subsystems.
5034 * This function requests irqs, probes the ATA bus, and probes
5038 * PCI/etc. bus probe sem.
5041 * Number of ports registered. Zero on error (no ports registered).
5044 int ata_device_add(const struct ata_probe_ent
*ent
)
5046 unsigned int count
= 0, i
;
5047 struct device
*dev
= ent
->dev
;
5048 struct ata_host_set
*host_set
;
5051 /* alloc a container for our list of ATA ports (buses) */
5052 host_set
= kzalloc(sizeof(struct ata_host_set
) +
5053 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
5056 spin_lock_init(&host_set
->lock
);
5058 host_set
->dev
= dev
;
5059 host_set
->n_ports
= ent
->n_ports
;
5060 host_set
->irq
= ent
->irq
;
5061 host_set
->mmio_base
= ent
->mmio_base
;
5062 host_set
->private_data
= ent
->private_data
;
5063 host_set
->ops
= ent
->port_ops
;
5065 /* register each port bound to this device */
5066 for (i
= 0; i
< ent
->n_ports
; i
++) {
5067 struct ata_port
*ap
;
5068 unsigned long xfer_mode_mask
;
5070 ap
= ata_host_add(ent
, host_set
, i
);
5074 host_set
->ports
[i
] = ap
;
5075 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
5076 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
5077 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
5079 /* print per-port info to dmesg */
5080 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
5081 "bmdma 0x%lX irq %lu\n",
5083 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
5084 ata_mode_string(xfer_mode_mask
),
5085 ap
->ioaddr
.cmd_addr
,
5086 ap
->ioaddr
.ctl_addr
,
5087 ap
->ioaddr
.bmdma_addr
,
5091 host_set
->ops
->irq_clear(ap
);
5098 /* obtain irq, that is shared between channels */
5099 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
5100 DRV_NAME
, host_set
))
5103 /* perform each probe synchronously */
5104 DPRINTK("probe begin\n");
5105 for (i
= 0; i
< count
; i
++) {
5106 struct ata_port
*ap
;
5109 ap
= host_set
->ports
[i
];
5111 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
5112 rc
= ata_bus_probe(ap
);
5113 DPRINTK("ata%u: bus probe end\n", ap
->id
);
5116 /* FIXME: do something useful here?
5117 * Current libata behavior will
5118 * tear down everything when
5119 * the module is removed
5120 * or the h/w is unplugged.
5124 rc
= scsi_add_host(ap
->host
, dev
);
5126 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
5128 /* FIXME: do something useful here */
5129 /* FIXME: handle unconditional calls to
5130 * scsi_scan_host and ata_host_remove, below,
5136 /* probes are done, now scan each port's disk(s) */
5137 DPRINTK("host probe begin\n");
5138 for (i
= 0; i
< count
; i
++) {
5139 struct ata_port
*ap
= host_set
->ports
[i
];
5141 ata_scsi_scan_host(ap
);
5144 dev_set_drvdata(dev
, host_set
);
5146 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5147 return ent
->n_ports
; /* success */
5150 for (i
= 0; i
< count
; i
++) {
5151 ata_host_remove(host_set
->ports
[i
], 1);
5152 scsi_host_put(host_set
->ports
[i
]->host
);
5156 VPRINTK("EXIT, returning 0\n");
5161 * ata_host_set_remove - PCI layer callback for device removal
5162 * @host_set: ATA host set that was removed
5164 * Unregister all objects associated with this host set. Free those
5168 * Inherited from calling layer (may sleep).
5171 void ata_host_set_remove(struct ata_host_set
*host_set
)
5173 struct ata_port
*ap
;
5176 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5177 ap
= host_set
->ports
[i
];
5178 scsi_remove_host(ap
->host
);
5181 free_irq(host_set
->irq
, host_set
);
5183 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5184 ap
= host_set
->ports
[i
];
5186 ata_scsi_release(ap
->host
);
5188 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5189 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5191 if (ioaddr
->cmd_addr
== 0x1f0)
5192 release_region(0x1f0, 8);
5193 else if (ioaddr
->cmd_addr
== 0x170)
5194 release_region(0x170, 8);
5197 scsi_host_put(ap
->host
);
5200 if (host_set
->ops
->host_stop
)
5201 host_set
->ops
->host_stop(host_set
);
5207 * ata_scsi_release - SCSI layer callback hook for host unload
5208 * @host: libata host to be unloaded
5210 * Performs all duties necessary to shut down a libata port...
5211 * Kill port kthread, disable port, and release resources.
5214 * Inherited from SCSI layer.
5220 int ata_scsi_release(struct Scsi_Host
*host
)
5222 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
5227 ap
->ops
->port_disable(ap
);
5228 ata_host_remove(ap
, 0);
5229 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
5230 kfree(ap
->device
[i
].id
);
5237 * ata_std_ports - initialize ioaddr with standard port offsets.
5238 * @ioaddr: IO address structure to be initialized
5240 * Utility function which initializes data_addr, error_addr,
5241 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5242 * device_addr, status_addr, and command_addr to standard offsets
5243 * relative to cmd_addr.
5245 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5248 void ata_std_ports(struct ata_ioports
*ioaddr
)
5250 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5251 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5252 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5253 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5254 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5255 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5256 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5257 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5258 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5259 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5265 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5267 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5269 pci_iounmap(pdev
, host_set
->mmio_base
);
5273 * ata_pci_remove_one - PCI layer callback for device removal
5274 * @pdev: PCI device that was removed
5276 * PCI layer indicates to libata via this hook that
5277 * hot-unplug or module unload event has occurred.
5278 * Handle this by unregistering all objects associated
5279 * with this PCI device. Free those objects. Then finally
5280 * release PCI resources and disable device.
5283 * Inherited from PCI layer (may sleep).
5286 void ata_pci_remove_one (struct pci_dev
*pdev
)
5288 struct device
*dev
= pci_dev_to_dev(pdev
);
5289 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5291 ata_host_set_remove(host_set
);
5292 pci_release_regions(pdev
);
5293 pci_disable_device(pdev
);
5294 dev_set_drvdata(dev
, NULL
);
5297 /* move to PCI subsystem */
5298 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5300 unsigned long tmp
= 0;
5302 switch (bits
->width
) {
5305 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5311 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5317 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5328 return (tmp
== bits
->val
) ? 1 : 0;
5331 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5333 pci_save_state(pdev
);
5334 pci_disable_device(pdev
);
5335 pci_set_power_state(pdev
, PCI_D3hot
);
5339 int ata_pci_device_resume(struct pci_dev
*pdev
)
5341 pci_set_power_state(pdev
, PCI_D0
);
5342 pci_restore_state(pdev
);
5343 pci_enable_device(pdev
);
5344 pci_set_master(pdev
);
5347 #endif /* CONFIG_PCI */
5350 static int __init
ata_init(void)
5352 ata_wq
= create_workqueue("ata");
5356 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5360 static void __exit
ata_exit(void)
5362 destroy_workqueue(ata_wq
);
5365 module_init(ata_init
);
5366 module_exit(ata_exit
);
5368 static unsigned long ratelimit_time
;
5369 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5371 int ata_ratelimit(void)
5374 unsigned long flags
;
5376 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5378 if (time_after(jiffies
, ratelimit_time
)) {
5380 ratelimit_time
= jiffies
+ (HZ
/5);
5384 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5390 * libata is essentially a library of internal helper functions for
5391 * low-level ATA host controller drivers. As such, the API/ABI is
5392 * likely to change as new drivers are added and updated.
5393 * Do not depend on ABI/API stability.
5396 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5397 EXPORT_SYMBOL_GPL(ata_std_ports
);
5398 EXPORT_SYMBOL_GPL(ata_device_add
);
5399 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5400 EXPORT_SYMBOL_GPL(ata_sg_init
);
5401 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5402 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5403 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5404 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5405 EXPORT_SYMBOL_GPL(ata_tf_load
);
5406 EXPORT_SYMBOL_GPL(ata_tf_read
);
5407 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5408 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5409 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5410 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5411 EXPORT_SYMBOL_GPL(ata_check_status
);
5412 EXPORT_SYMBOL_GPL(ata_altstatus
);
5413 EXPORT_SYMBOL_GPL(ata_exec_command
);
5414 EXPORT_SYMBOL_GPL(ata_port_start
);
5415 EXPORT_SYMBOL_GPL(ata_port_stop
);
5416 EXPORT_SYMBOL_GPL(ata_host_stop
);
5417 EXPORT_SYMBOL_GPL(ata_interrupt
);
5418 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5419 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5420 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5421 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5422 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5423 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5424 EXPORT_SYMBOL_GPL(ata_port_probe
);
5425 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5426 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5427 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5428 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5429 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5430 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5431 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5432 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5433 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5434 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5435 EXPORT_SYMBOL_GPL(ata_port_disable
);
5436 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5437 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5438 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5439 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5440 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5441 EXPORT_SYMBOL_GPL(ata_scsi_timed_out
);
5442 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5443 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5444 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5445 EXPORT_SYMBOL_GPL(ata_host_intr
);
5446 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5447 EXPORT_SYMBOL_GPL(ata_id_string
);
5448 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5449 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5450 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5451 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5453 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5454 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5455 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5458 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5459 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5460 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5461 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5462 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5463 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5464 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5465 #endif /* CONFIG_PCI */
5467 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5468 EXPORT_SYMBOL_GPL(ata_device_resume
);
5469 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5470 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);