2 * libata-core.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/config.h>
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/list.h>
42 #include <linux/highmem.h>
43 #include <linux/spinlock.h>
44 #include <linux/blkdev.h>
45 #include <linux/delay.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/completion.h>
49 #include <linux/suspend.h>
50 #include <linux/workqueue.h>
51 #include <linux/jiffies.h>
52 #include <linux/scatterlist.h>
53 #include <scsi/scsi.h>
54 #include "scsi_priv.h"
55 #include <scsi/scsi_cmnd.h>
56 #include <scsi/scsi_host.h>
57 #include <linux/libata.h>
59 #include <asm/semaphore.h>
60 #include <asm/byteorder.h>
64 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
65 struct ata_device
*dev
,
68 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
69 struct ata_device
*dev
);
70 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
);
72 static unsigned int ata_unique_id
= 1;
73 static struct workqueue_struct
*ata_wq
;
75 int atapi_enabled
= 1;
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
);
257 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
258 * @xfer_mask: xfer_mask to unpack
259 * @pio_mask: resulting pio_mask
260 * @mwdma_mask: resulting mwdma_mask
261 * @udma_mask: resulting udma_mask
263 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
264 * Any NULL distination masks will be ignored.
266 static void ata_unpack_xfermask(unsigned int xfer_mask
,
267 unsigned int *pio_mask
,
268 unsigned int *mwdma_mask
,
269 unsigned int *udma_mask
)
272 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
274 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
276 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
279 static const struct ata_xfer_ent
{
283 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
284 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
285 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
290 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
291 * @xfer_mask: xfer_mask of interest
293 * Return matching XFER_* value for @xfer_mask. Only the highest
294 * bit of @xfer_mask is considered.
300 * Matching XFER_* value, 0 if no match found.
302 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
304 int highbit
= fls(xfer_mask
) - 1;
305 const struct ata_xfer_ent
*ent
;
307 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
308 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
309 return ent
->base
+ highbit
- ent
->shift
;
314 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
315 * @xfer_mode: XFER_* of interest
317 * Return matching xfer_mask for @xfer_mode.
323 * Matching xfer_mask, 0 if no match found.
325 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
327 const struct ata_xfer_ent
*ent
;
329 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
330 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
331 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
336 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
337 * @xfer_mode: XFER_* of interest
339 * Return matching xfer_shift for @xfer_mode.
345 * Matching xfer_shift, -1 if no match found.
347 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
349 const struct ata_xfer_ent
*ent
;
351 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
352 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
358 * ata_mode_string - convert xfer_mask to string
359 * @xfer_mask: mask of bits supported; only highest bit counts.
361 * Determine string which represents the highest speed
362 * (highest bit in @modemask).
368 * Constant C string representing highest speed listed in
369 * @mode_mask, or the constant C string "<n/a>".
371 static const char *ata_mode_string(unsigned int xfer_mask
)
373 static const char * const xfer_mode_str
[] = {
393 highbit
= fls(xfer_mask
) - 1;
394 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
395 return xfer_mode_str
[highbit
];
399 static const char *sata_spd_string(unsigned int spd
)
401 static const char * const spd_str
[] = {
406 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
408 return spd_str
[spd
- 1];
411 void ata_dev_disable(struct ata_port
*ap
, struct ata_device
*dev
)
413 if (ata_dev_enabled(dev
)) {
414 printk(KERN_WARNING
"ata%u: dev %u disabled\n",
421 * ata_pio_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_pio_devchk(struct ata_port
*ap
,
441 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
444 ap
->ops
->dev_select(ap
, device
);
446 outb(0x55, ioaddr
->nsect_addr
);
447 outb(0xaa, ioaddr
->lbal_addr
);
449 outb(0xaa, ioaddr
->nsect_addr
);
450 outb(0x55, ioaddr
->lbal_addr
);
452 outb(0x55, ioaddr
->nsect_addr
);
453 outb(0xaa, ioaddr
->lbal_addr
);
455 nsect
= inb(ioaddr
->nsect_addr
);
456 lbal
= inb(ioaddr
->lbal_addr
);
458 if ((nsect
== 0x55) && (lbal
== 0xaa))
459 return 1; /* we found a device */
461 return 0; /* nothing found */
465 * ata_mmio_devchk - PATA device presence detection
466 * @ap: ATA channel to examine
467 * @device: Device to examine (starting at zero)
469 * This technique was originally described in
470 * Hale Landis's ATADRVR (www.ata-atapi.com), and
471 * later found its way into the ATA/ATAPI spec.
473 * Write a pattern to the ATA shadow registers,
474 * and if a device is present, it will respond by
475 * correctly storing and echoing back the
476 * ATA shadow register contents.
482 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
485 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
488 ap
->ops
->dev_select(ap
, device
);
490 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
491 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
493 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
494 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
496 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
497 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
499 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
500 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
502 if ((nsect
== 0x55) && (lbal
== 0xaa))
503 return 1; /* we found a device */
505 return 0; /* nothing found */
509 * ata_devchk - PATA device presence detection
510 * @ap: ATA channel to examine
511 * @device: Device to examine (starting at zero)
513 * Dispatch ATA device presence detection, depending
514 * on whether we are using PIO or MMIO to talk to the
515 * ATA shadow registers.
521 static unsigned int ata_devchk(struct ata_port
*ap
,
524 if (ap
->flags
& ATA_FLAG_MMIO
)
525 return ata_mmio_devchk(ap
, device
);
526 return ata_pio_devchk(ap
, device
);
530 * ata_dev_classify - determine device type based on ATA-spec signature
531 * @tf: ATA taskfile register set for device to be identified
533 * Determine from taskfile register contents whether a device is
534 * ATA or ATAPI, as per "Signature and persistence" section
535 * of ATA/PI spec (volume 1, sect 5.14).
541 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
542 * the event of failure.
545 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
547 /* Apple's open source Darwin code hints that some devices only
548 * put a proper signature into the LBA mid/high registers,
549 * So, we only check those. It's sufficient for uniqueness.
552 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
553 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
554 DPRINTK("found ATA device by sig\n");
558 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
559 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
560 DPRINTK("found ATAPI device by sig\n");
561 return ATA_DEV_ATAPI
;
564 DPRINTK("unknown device\n");
565 return ATA_DEV_UNKNOWN
;
569 * ata_dev_try_classify - Parse returned ATA device signature
570 * @ap: ATA channel to examine
571 * @device: Device to examine (starting at zero)
572 * @r_err: Value of error register on completion
574 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
575 * an ATA/ATAPI-defined set of values is placed in the ATA
576 * shadow registers, indicating the results of device detection
579 * Select the ATA device, and read the values from the ATA shadow
580 * registers. Then parse according to the Error register value,
581 * and the spec-defined values examined by ata_dev_classify().
587 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
591 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
593 struct ata_taskfile tf
;
597 ap
->ops
->dev_select(ap
, device
);
599 memset(&tf
, 0, sizeof(tf
));
601 ap
->ops
->tf_read(ap
, &tf
);
606 /* see if device passed diags */
609 else if ((device
== 0) && (err
== 0x81))
614 /* determine if device is ATA or ATAPI */
615 class = ata_dev_classify(&tf
);
617 if (class == ATA_DEV_UNKNOWN
)
619 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
625 * ata_id_string - Convert IDENTIFY DEVICE page into string
626 * @id: IDENTIFY DEVICE results we will examine
627 * @s: string into which data is output
628 * @ofs: offset into identify device page
629 * @len: length of string to return. must be an even number.
631 * The strings in the IDENTIFY DEVICE page are broken up into
632 * 16-bit chunks. Run through the string, and output each
633 * 8-bit chunk linearly, regardless of platform.
639 void ata_id_string(const u16
*id
, unsigned char *s
,
640 unsigned int ofs
, unsigned int len
)
659 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
660 * @id: IDENTIFY DEVICE results we will examine
661 * @s: string into which data is output
662 * @ofs: offset into identify device page
663 * @len: length of string to return. must be an odd number.
665 * This function is identical to ata_id_string except that it
666 * trims trailing spaces and terminates the resulting string with
667 * null. @len must be actual maximum length (even number) + 1.
672 void ata_id_c_string(const u16
*id
, unsigned char *s
,
673 unsigned int ofs
, unsigned int len
)
679 ata_id_string(id
, s
, ofs
, len
- 1);
681 p
= s
+ strnlen(s
, len
- 1);
682 while (p
> s
&& p
[-1] == ' ')
687 static u64
ata_id_n_sectors(const u16
*id
)
689 if (ata_id_has_lba(id
)) {
690 if (ata_id_has_lba48(id
))
691 return ata_id_u64(id
, 100);
693 return ata_id_u32(id
, 60);
695 if (ata_id_current_chs_valid(id
))
696 return ata_id_u32(id
, 57);
698 return id
[1] * id
[3] * id
[6];
703 * ata_noop_dev_select - Select device 0/1 on ATA bus
704 * @ap: ATA channel to manipulate
705 * @device: ATA device (numbered from zero) to select
707 * This function performs no actual function.
709 * May be used as the dev_select() entry in ata_port_operations.
714 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
720 * ata_std_dev_select - Select device 0/1 on ATA bus
721 * @ap: ATA channel to manipulate
722 * @device: ATA device (numbered from zero) to select
724 * Use the method defined in the ATA specification to
725 * make either device 0, or device 1, active on the
726 * ATA channel. Works with both PIO and MMIO.
728 * May be used as the dev_select() entry in ata_port_operations.
734 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
739 tmp
= ATA_DEVICE_OBS
;
741 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
743 if (ap
->flags
& ATA_FLAG_MMIO
) {
744 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
746 outb(tmp
, ap
->ioaddr
.device_addr
);
748 ata_pause(ap
); /* needed; also flushes, for mmio */
752 * ata_dev_select - Select device 0/1 on ATA bus
753 * @ap: ATA channel to manipulate
754 * @device: ATA device (numbered from zero) to select
755 * @wait: non-zero to wait for Status register BSY bit to clear
756 * @can_sleep: non-zero if context allows sleeping
758 * Use the method defined in the ATA specification to
759 * make either device 0, or device 1, active on the
762 * This is a high-level version of ata_std_dev_select(),
763 * which additionally provides the services of inserting
764 * the proper pauses and status polling, where needed.
770 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
771 unsigned int wait
, unsigned int can_sleep
)
773 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
774 ap
->id
, device
, wait
);
779 ap
->ops
->dev_select(ap
, device
);
782 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
789 * ata_dump_id - IDENTIFY DEVICE info debugging output
790 * @id: IDENTIFY DEVICE page to dump
792 * Dump selected 16-bit words from the given IDENTIFY DEVICE
799 static inline void ata_dump_id(const u16
*id
)
801 DPRINTK("49==0x%04x "
811 DPRINTK("80==0x%04x "
821 DPRINTK("88==0x%04x "
828 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
829 * @id: IDENTIFY data to compute xfer mask from
831 * Compute the xfermask for this device. This is not as trivial
832 * as it seems if we must consider early devices correctly.
834 * FIXME: pre IDE drive timing (do we care ?).
842 static unsigned int ata_id_xfermask(const u16
*id
)
844 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
846 /* Usual case. Word 53 indicates word 64 is valid */
847 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
848 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
852 /* If word 64 isn't valid then Word 51 high byte holds
853 * the PIO timing number for the maximum. Turn it into
856 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
858 /* But wait.. there's more. Design your standards by
859 * committee and you too can get a free iordy field to
860 * process. However its the speeds not the modes that
861 * are supported... Note drivers using the timing API
862 * will get this right anyway
866 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
869 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
870 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
872 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
876 * ata_port_queue_task - Queue port_task
877 * @ap: The ata_port to queue port_task for
879 * Schedule @fn(@data) for execution after @delay jiffies using
880 * port_task. There is one port_task per port and it's the
881 * user(low level driver)'s responsibility to make sure that only
882 * one task is active at any given time.
884 * libata core layer takes care of synchronization between
885 * port_task and EH. ata_port_queue_task() may be ignored for EH
889 * Inherited from caller.
891 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
896 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
899 PREPARE_WORK(&ap
->port_task
, fn
, data
);
902 rc
= queue_work(ata_wq
, &ap
->port_task
);
904 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
906 /* rc == 0 means that another user is using port task */
911 * ata_port_flush_task - Flush port_task
912 * @ap: The ata_port to flush port_task for
914 * After this function completes, port_task is guranteed not to
915 * be running or scheduled.
918 * Kernel thread context (may sleep)
920 void ata_port_flush_task(struct ata_port
*ap
)
926 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
927 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
928 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
930 DPRINTK("flush #1\n");
931 flush_workqueue(ata_wq
);
934 * At this point, if a task is running, it's guaranteed to see
935 * the FLUSH flag; thus, it will never queue pio tasks again.
938 if (!cancel_delayed_work(&ap
->port_task
)) {
939 DPRINTK("flush #2\n");
940 flush_workqueue(ata_wq
);
943 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
944 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
945 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
950 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
952 struct completion
*waiting
= qc
->private_data
;
954 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
959 * ata_exec_internal - execute libata internal command
960 * @ap: Port to which the command is sent
961 * @dev: Device to which the command is sent
962 * @tf: Taskfile registers for the command and the result
963 * @cdb: CDB for packet command
964 * @dma_dir: Data tranfer direction of the command
965 * @buf: Data buffer of the command
966 * @buflen: Length of data buffer
968 * Executes libata internal command with timeout. @tf contains
969 * command on entry and result on return. Timeout and error
970 * conditions are reported via return value. No recovery action
971 * is taken after a command times out. It's caller's duty to
972 * clean up after timeout.
975 * None. Should be called with kernel context, might sleep.
978 unsigned ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
979 struct ata_taskfile
*tf
, const u8
*cdb
,
980 int dma_dir
, void *buf
, unsigned int buflen
)
982 u8 command
= tf
->command
;
983 struct ata_queued_cmd
*qc
;
984 DECLARE_COMPLETION(wait
);
986 unsigned int err_mask
;
988 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
990 qc
= ata_qc_new_init(ap
, dev
);
995 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
996 qc
->dma_dir
= dma_dir
;
997 if (dma_dir
!= DMA_NONE
) {
998 ata_sg_init_one(qc
, buf
, buflen
);
999 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1002 qc
->private_data
= &wait
;
1003 qc
->complete_fn
= ata_qc_complete_internal
;
1007 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1009 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1010 ata_port_flush_task(ap
);
1012 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1014 /* We're racing with irq here. If we lose, the
1015 * following test prevents us from completing the qc
1016 * again. If completion irq occurs after here but
1017 * before the caller cleans up, it will result in a
1018 * spurious interrupt. We can live with that.
1020 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1021 qc
->err_mask
= AC_ERR_TIMEOUT
;
1022 ata_qc_complete(qc
);
1023 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1027 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1031 err_mask
= qc
->err_mask
;
1035 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1036 * Until those drivers are fixed, we detect the condition
1037 * here, fail the command with AC_ERR_SYSTEM and reenable the
1040 * Note that this doesn't change any behavior as internal
1041 * command failure results in disabling the device in the
1042 * higher layer for LLDDs without new reset/EH callbacks.
1044 * Kill the following code as soon as those drivers are fixed.
1046 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1047 err_mask
|= AC_ERR_SYSTEM
;
1055 * ata_pio_need_iordy - check if iordy needed
1058 * Check if the current speed of the device requires IORDY. Used
1059 * by various controllers for chip configuration.
1062 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1065 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1072 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1074 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1075 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1076 /* Is the speed faster than the drive allows non IORDY ? */
1078 /* This is cycle times not frequency - watch the logic! */
1079 if (pio
> 240) /* PIO2 is 240nS per cycle */
1088 * ata_dev_read_id - Read ID data from the specified device
1089 * @ap: port on which target device resides
1090 * @dev: target device
1091 * @p_class: pointer to class of the target device (may be changed)
1092 * @post_reset: is this read ID post-reset?
1093 * @p_id: read IDENTIFY page (newly allocated)
1095 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1096 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1097 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1098 * for pre-ATA4 drives.
1101 * Kernel thread context (may sleep)
1104 * 0 on success, -errno otherwise.
1106 static int ata_dev_read_id(struct ata_port
*ap
, struct ata_device
*dev
,
1107 unsigned int *p_class
, int post_reset
, u16
**p_id
)
1109 unsigned int class = *p_class
;
1110 struct ata_taskfile tf
;
1111 unsigned int err_mask
= 0;
1116 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1118 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1120 id
= kmalloc(sizeof(id
[0]) * ATA_ID_WORDS
, GFP_KERNEL
);
1123 reason
= "out of memory";
1128 ata_tf_init(ap
, &tf
, dev
->devno
);
1132 tf
.command
= ATA_CMD_ID_ATA
;
1135 tf
.command
= ATA_CMD_ID_ATAPI
;
1139 reason
= "unsupported class";
1143 tf
.protocol
= ATA_PROT_PIO
;
1145 err_mask
= ata_exec_internal(ap
, dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1146 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1149 reason
= "I/O error";
1153 swap_buf_le16(id
, ATA_ID_WORDS
);
1156 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1158 reason
= "device reports illegal type";
1162 if (post_reset
&& class == ATA_DEV_ATA
) {
1164 * The exact sequence expected by certain pre-ATA4 drives is:
1167 * INITIALIZE DEVICE PARAMETERS
1169 * Some drives were very specific about that exact sequence.
1171 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1172 err_mask
= ata_dev_init_params(ap
, dev
, id
[3], id
[6]);
1175 reason
= "INIT_DEV_PARAMS failed";
1179 /* current CHS translation info (id[53-58]) might be
1180 * changed. reread the identify device info.
1192 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1193 ap
->id
, dev
->devno
, reason
);
1198 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1199 struct ata_device
*dev
)
1201 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1205 * ata_dev_configure - Configure the specified ATA/ATAPI device
1206 * @ap: Port on which target device resides
1207 * @dev: Target device to configure
1208 * @print_info: Enable device info printout
1210 * Configure @dev according to @dev->id. Generic and low-level
1211 * driver specific fixups are also applied.
1214 * Kernel thread context (may sleep)
1217 * 0 on success, -errno otherwise
1219 static int ata_dev_configure(struct ata_port
*ap
, struct ata_device
*dev
,
1222 const u16
*id
= dev
->id
;
1223 unsigned int xfer_mask
;
1226 if (!ata_dev_enabled(dev
)) {
1227 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1228 ap
->id
, dev
->devno
);
1232 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1234 /* print device capabilities */
1236 printk(KERN_DEBUG
"ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1237 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1238 ap
->id
, dev
->devno
, id
[49], id
[82], id
[83],
1239 id
[84], id
[85], id
[86], id
[87], id
[88]);
1241 /* initialize to-be-configured parameters */
1242 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1243 dev
->max_sectors
= 0;
1251 * common ATA, ATAPI feature tests
1254 /* find max transfer mode; for printk only */
1255 xfer_mask
= ata_id_xfermask(id
);
1259 /* ATA-specific feature tests */
1260 if (dev
->class == ATA_DEV_ATA
) {
1261 dev
->n_sectors
= ata_id_n_sectors(id
);
1263 if (ata_id_has_lba(id
)) {
1264 const char *lba_desc
;
1267 dev
->flags
|= ATA_DFLAG_LBA
;
1268 if (ata_id_has_lba48(id
)) {
1269 dev
->flags
|= ATA_DFLAG_LBA48
;
1273 /* print device info to dmesg */
1275 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1276 "max %s, %Lu sectors: %s\n",
1278 ata_id_major_version(id
),
1279 ata_mode_string(xfer_mask
),
1280 (unsigned long long)dev
->n_sectors
,
1285 /* Default translation */
1286 dev
->cylinders
= id
[1];
1288 dev
->sectors
= id
[6];
1290 if (ata_id_current_chs_valid(id
)) {
1291 /* Current CHS translation is valid. */
1292 dev
->cylinders
= id
[54];
1293 dev
->heads
= id
[55];
1294 dev
->sectors
= id
[56];
1297 /* print device info to dmesg */
1299 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1300 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1302 ata_id_major_version(id
),
1303 ata_mode_string(xfer_mask
),
1304 (unsigned long long)dev
->n_sectors
,
1305 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1311 /* ATAPI-specific feature tests */
1312 else if (dev
->class == ATA_DEV_ATAPI
) {
1313 rc
= atapi_cdb_len(id
);
1314 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1315 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1319 dev
->cdb_len
= (unsigned int) rc
;
1321 /* print device info to dmesg */
1323 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1324 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1327 ap
->host
->max_cmd_len
= 0;
1328 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1329 ap
->host
->max_cmd_len
= max_t(unsigned int,
1330 ap
->host
->max_cmd_len
,
1331 ap
->device
[i
].cdb_len
);
1333 /* limit bridge transfers to udma5, 200 sectors */
1334 if (ata_dev_knobble(ap
, dev
)) {
1336 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1337 ap
->id
, dev
->devno
);
1338 dev
->udma_mask
&= ATA_UDMA5
;
1339 dev
->max_sectors
= ATA_MAX_SECTORS
;
1342 if (ap
->ops
->dev_config
)
1343 ap
->ops
->dev_config(ap
, dev
);
1345 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1349 DPRINTK("EXIT, err\n");
1354 * ata_bus_probe - Reset and probe ATA bus
1357 * Master ATA bus probing function. Initiates a hardware-dependent
1358 * bus reset, then attempts to identify any devices found on
1362 * PCI/etc. bus probe sem.
1365 * Zero on success, negative errno otherwise.
1368 static int ata_bus_probe(struct ata_port
*ap
)
1370 unsigned int classes
[ATA_MAX_DEVICES
];
1371 int tries
[ATA_MAX_DEVICES
];
1372 int i
, rc
, down_xfermask
;
1373 struct ata_device
*dev
;
1377 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1378 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1383 /* reset and determine device classes */
1384 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1385 classes
[i
] = ATA_DEV_UNKNOWN
;
1387 if (ap
->ops
->probe_reset
) {
1388 rc
= ap
->ops
->probe_reset(ap
, classes
);
1390 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1394 ap
->ops
->phy_reset(ap
);
1396 if (!(ap
->flags
& ATA_FLAG_DISABLED
))
1397 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1398 classes
[i
] = ap
->device
[i
].class;
1403 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1404 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1405 classes
[i
] = ATA_DEV_NONE
;
1407 /* read IDENTIFY page and configure devices */
1408 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1409 dev
= &ap
->device
[i
];
1410 dev
->class = classes
[i
];
1413 ata_down_xfermask_limit(ap
, dev
, 1);
1414 ata_dev_disable(ap
, dev
);
1417 if (!ata_dev_enabled(dev
))
1422 rc
= ata_dev_read_id(ap
, dev
, &dev
->class, 1, &dev
->id
);
1426 rc
= ata_dev_configure(ap
, dev
, 1);
1431 /* configure transfer mode */
1432 if (ap
->ops
->set_mode
) {
1433 /* FIXME: make ->set_mode handle no device case and
1434 * return error code and failing device on failure as
1435 * ata_set_mode() does.
1437 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1438 if (ata_dev_enabled(&ap
->device
[i
])) {
1439 ap
->ops
->set_mode(ap
);
1444 rc
= ata_set_mode(ap
, &dev
);
1451 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1452 if (ata_dev_enabled(&ap
->device
[i
]))
1455 /* no device present, disable port */
1456 ata_port_disable(ap
);
1457 ap
->ops
->port_disable(ap
);
1464 tries
[dev
->devno
] = 0;
1467 ata_down_sata_spd_limit(ap
);
1470 tries
[dev
->devno
]--;
1471 if (down_xfermask
&&
1472 ata_down_xfermask_limit(ap
, dev
, tries
[dev
->devno
] == 1))
1473 tries
[dev
->devno
] = 0;
1480 * ata_port_probe - Mark port as enabled
1481 * @ap: Port for which we indicate enablement
1483 * Modify @ap data structure such that the system
1484 * thinks that the entire port is enabled.
1486 * LOCKING: host_set lock, or some other form of
1490 void ata_port_probe(struct ata_port
*ap
)
1492 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1496 * sata_print_link_status - Print SATA link status
1497 * @ap: SATA port to printk link status about
1499 * This function prints link speed and status of a SATA link.
1504 static void sata_print_link_status(struct ata_port
*ap
)
1506 u32 sstatus
, scontrol
, tmp
;
1508 if (!ap
->ops
->scr_read
)
1511 sstatus
= scr_read(ap
, SCR_STATUS
);
1512 scontrol
= scr_read(ap
, SCR_CONTROL
);
1514 if (sata_dev_present(ap
)) {
1515 tmp
= (sstatus
>> 4) & 0xf;
1517 "ata%u: SATA link up %s (SStatus %X SControl %X)\n",
1518 ap
->id
, sata_spd_string(tmp
), sstatus
, scontrol
);
1521 "ata%u: SATA link down (SStatus %X SControl %X)\n",
1522 ap
->id
, sstatus
, scontrol
);
1527 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1528 * @ap: SATA port associated with target SATA PHY.
1530 * This function issues commands to standard SATA Sxxx
1531 * PHY registers, to wake up the phy (and device), and
1532 * clear any reset condition.
1535 * PCI/etc. bus probe sem.
1538 void __sata_phy_reset(struct ata_port
*ap
)
1541 unsigned long timeout
= jiffies
+ (HZ
* 5);
1543 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1544 /* issue phy wake/reset */
1545 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1546 /* Couldn't find anything in SATA I/II specs, but
1547 * AHCI-1.1 10.4.2 says at least 1 ms. */
1550 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1552 /* wait for phy to become ready, if necessary */
1555 sstatus
= scr_read(ap
, SCR_STATUS
);
1556 if ((sstatus
& 0xf) != 1)
1558 } while (time_before(jiffies
, timeout
));
1560 /* print link status */
1561 sata_print_link_status(ap
);
1563 /* TODO: phy layer with polling, timeouts, etc. */
1564 if (sata_dev_present(ap
))
1567 ata_port_disable(ap
);
1569 if (ap
->flags
& ATA_FLAG_DISABLED
)
1572 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1573 ata_port_disable(ap
);
1577 ap
->cbl
= ATA_CBL_SATA
;
1581 * sata_phy_reset - Reset SATA bus.
1582 * @ap: SATA port associated with target SATA PHY.
1584 * This function resets the SATA bus, and then probes
1585 * the bus for devices.
1588 * PCI/etc. bus probe sem.
1591 void sata_phy_reset(struct ata_port
*ap
)
1593 __sata_phy_reset(ap
);
1594 if (ap
->flags
& ATA_FLAG_DISABLED
)
1600 * ata_dev_pair - return other device on cable
1604 * Obtain the other device on the same cable, or if none is
1605 * present NULL is returned
1608 struct ata_device
*ata_dev_pair(struct ata_port
*ap
, struct ata_device
*adev
)
1610 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1611 if (!ata_dev_enabled(pair
))
1617 * ata_port_disable - Disable port.
1618 * @ap: Port to be disabled.
1620 * Modify @ap data structure such that the system
1621 * thinks that the entire port is disabled, and should
1622 * never attempt to probe or communicate with devices
1625 * LOCKING: host_set lock, or some other form of
1629 void ata_port_disable(struct ata_port
*ap
)
1631 ap
->device
[0].class = ATA_DEV_NONE
;
1632 ap
->device
[1].class = ATA_DEV_NONE
;
1633 ap
->flags
|= ATA_FLAG_DISABLED
;
1637 * ata_down_sata_spd_limit - adjust SATA spd limit downward
1638 * @ap: Port to adjust SATA spd limit for
1640 * Adjust SATA spd limit of @ap downward. Note that this
1641 * function only adjusts the limit. The change must be applied
1642 * using ata_set_sata_spd().
1645 * Inherited from caller.
1648 * 0 on success, negative errno on failure
1650 int ata_down_sata_spd_limit(struct ata_port
*ap
)
1655 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1658 mask
= ap
->sata_spd_limit
;
1661 highbit
= fls(mask
) - 1;
1662 mask
&= ~(1 << highbit
);
1664 spd
= (scr_read(ap
, SCR_STATUS
) >> 4) & 0xf;
1668 mask
&= (1 << spd
) - 1;
1672 ap
->sata_spd_limit
= mask
;
1674 printk(KERN_WARNING
"ata%u: limiting SATA link speed to %s\n",
1675 ap
->id
, sata_spd_string(fls(mask
)));
1680 static int __ata_set_sata_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1684 if (ap
->sata_spd_limit
== UINT_MAX
)
1687 limit
= fls(ap
->sata_spd_limit
);
1689 spd
= (*scontrol
>> 4) & 0xf;
1690 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1692 return spd
!= limit
;
1696 * ata_set_sata_spd_needed - is SATA spd configuration needed
1697 * @ap: Port in question
1699 * Test whether the spd limit in SControl matches
1700 * @ap->sata_spd_limit. This function is used to determine
1701 * whether hardreset is necessary to apply SATA spd
1705 * Inherited from caller.
1708 * 1 if SATA spd configuration is needed, 0 otherwise.
1710 int ata_set_sata_spd_needed(struct ata_port
*ap
)
1714 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1717 scontrol
= scr_read(ap
, SCR_CONTROL
);
1719 return __ata_set_sata_spd_needed(ap
, &scontrol
);
1723 * ata_set_sata_spd - set SATA spd according to spd limit
1724 * @ap: Port to set SATA spd for
1726 * Set SATA spd of @ap according to sata_spd_limit.
1729 * Inherited from caller.
1732 * 0 if spd doesn't need to be changed, 1 if spd has been
1733 * changed. -EOPNOTSUPP if SCR registers are inaccessible.
1735 static int ata_set_sata_spd(struct ata_port
*ap
)
1739 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1742 scontrol
= scr_read(ap
, SCR_CONTROL
);
1743 if (!__ata_set_sata_spd_needed(ap
, &scontrol
))
1746 scr_write(ap
, SCR_CONTROL
, scontrol
);
1751 * This mode timing computation functionality is ported over from
1752 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1755 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1756 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1757 * for PIO 5, which is a nonstandard extension and UDMA6, which
1758 * is currently supported only by Maxtor drives.
1761 static const struct ata_timing ata_timing
[] = {
1763 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1764 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1765 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1766 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1768 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1769 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1770 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1772 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1774 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1775 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1776 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1778 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1779 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1780 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1782 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1783 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1784 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1786 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1787 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1788 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1790 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1795 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1796 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1798 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1800 q
->setup
= EZ(t
->setup
* 1000, T
);
1801 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1802 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1803 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1804 q
->active
= EZ(t
->active
* 1000, T
);
1805 q
->recover
= EZ(t
->recover
* 1000, T
);
1806 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1807 q
->udma
= EZ(t
->udma
* 1000, UT
);
1810 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1811 struct ata_timing
*m
, unsigned int what
)
1813 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1814 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1815 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1816 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1817 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1818 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1819 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1820 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1823 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1825 const struct ata_timing
*t
;
1827 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1828 if (t
->mode
== 0xFF)
1833 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1834 struct ata_timing
*t
, int T
, int UT
)
1836 const struct ata_timing
*s
;
1837 struct ata_timing p
;
1843 if (!(s
= ata_timing_find_mode(speed
)))
1846 memcpy(t
, s
, sizeof(*s
));
1849 * If the drive is an EIDE drive, it can tell us it needs extended
1850 * PIO/MW_DMA cycle timing.
1853 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1854 memset(&p
, 0, sizeof(p
));
1855 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1856 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1857 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1858 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1859 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1861 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1865 * Convert the timing to bus clock counts.
1868 ata_timing_quantize(t
, t
, T
, UT
);
1871 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1872 * S.M.A.R.T * and some other commands. We have to ensure that the
1873 * DMA cycle timing is slower/equal than the fastest PIO timing.
1876 if (speed
> XFER_PIO_4
) {
1877 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1878 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1882 * Lengthen active & recovery time so that cycle time is correct.
1885 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1886 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1887 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1890 if (t
->active
+ t
->recover
< t
->cycle
) {
1891 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1892 t
->recover
= t
->cycle
- t
->active
;
1899 * ata_down_xfermask_limit - adjust dev xfer masks downward
1900 * @ap: Port associated with device @dev
1901 * @dev: Device to adjust xfer masks
1902 * @force_pio0: Force PIO0
1904 * Adjust xfer masks of @dev downward. Note that this function
1905 * does not apply the change. Invoking ata_set_mode() afterwards
1906 * will apply the limit.
1909 * Inherited from caller.
1912 * 0 on success, negative errno on failure
1914 int ata_down_xfermask_limit(struct ata_port
*ap
, struct ata_device
*dev
,
1917 unsigned long xfer_mask
;
1920 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
1925 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1926 if (xfer_mask
& ATA_MASK_UDMA
)
1927 xfer_mask
&= ~ATA_MASK_MWDMA
;
1929 highbit
= fls(xfer_mask
) - 1;
1930 xfer_mask
&= ~(1 << highbit
);
1932 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
1936 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
1939 printk(KERN_WARNING
"ata%u: dev %u limiting speed to %s\n",
1940 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1948 static int ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1950 unsigned int err_mask
;
1953 dev
->flags
&= ~ATA_DFLAG_PIO
;
1954 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1955 dev
->flags
|= ATA_DFLAG_PIO
;
1957 err_mask
= ata_dev_set_xfermode(ap
, dev
);
1960 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1965 rc
= ata_dev_revalidate(ap
, dev
, 0);
1969 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1970 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1972 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1974 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1979 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1980 * @ap: port on which timings will be programmed
1981 * @r_failed_dev: out paramter for failed device
1983 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1984 * ata_set_mode() fails, pointer to the failing device is
1985 * returned in @r_failed_dev.
1988 * PCI/etc. bus probe sem.
1991 * 0 on success, negative errno otherwise
1993 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
1995 struct ata_device
*dev
;
1996 int i
, rc
= 0, used_dma
= 0, found
= 0;
1998 /* step 1: calculate xfer_mask */
1999 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2000 unsigned int pio_mask
, dma_mask
;
2002 dev
= &ap
->device
[i
];
2004 if (!ata_dev_enabled(dev
))
2007 ata_dev_xfermask(ap
, dev
);
2009 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2010 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2011 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2012 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2021 /* step 2: always set host PIO timings */
2022 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2023 dev
= &ap
->device
[i
];
2024 if (!ata_dev_enabled(dev
))
2027 if (!dev
->pio_mode
) {
2028 printk(KERN_WARNING
"ata%u: dev %u no PIO support\n",
2029 ap
->id
, dev
->devno
);
2034 dev
->xfer_mode
= dev
->pio_mode
;
2035 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2036 if (ap
->ops
->set_piomode
)
2037 ap
->ops
->set_piomode(ap
, dev
);
2040 /* step 3: set host DMA timings */
2041 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2042 dev
= &ap
->device
[i
];
2044 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2047 dev
->xfer_mode
= dev
->dma_mode
;
2048 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2049 if (ap
->ops
->set_dmamode
)
2050 ap
->ops
->set_dmamode(ap
, dev
);
2053 /* step 4: update devices' xfer mode */
2054 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2055 dev
= &ap
->device
[i
];
2057 if (!ata_dev_enabled(dev
))
2060 rc
= ata_dev_set_mode(ap
, dev
);
2065 /* Record simplex status. If we selected DMA then the other
2066 * host channels are not permitted to do so.
2068 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2069 ap
->host_set
->simplex_claimed
= 1;
2071 /* step5: chip specific finalisation */
2072 if (ap
->ops
->post_set_mode
)
2073 ap
->ops
->post_set_mode(ap
);
2077 *r_failed_dev
= dev
;
2082 * ata_tf_to_host - issue ATA taskfile to host controller
2083 * @ap: port to which command is being issued
2084 * @tf: ATA taskfile register set
2086 * Issues ATA taskfile register set to ATA host controller,
2087 * with proper synchronization with interrupt handler and
2091 * spin_lock_irqsave(host_set lock)
2094 static inline void ata_tf_to_host(struct ata_port
*ap
,
2095 const struct ata_taskfile
*tf
)
2097 ap
->ops
->tf_load(ap
, tf
);
2098 ap
->ops
->exec_command(ap
, tf
);
2102 * ata_busy_sleep - sleep until BSY clears, or timeout
2103 * @ap: port containing status register to be polled
2104 * @tmout_pat: impatience timeout
2105 * @tmout: overall timeout
2107 * Sleep until ATA Status register bit BSY clears,
2108 * or a timeout occurs.
2113 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2114 unsigned long tmout_pat
, unsigned long tmout
)
2116 unsigned long timer_start
, timeout
;
2119 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2120 timer_start
= jiffies
;
2121 timeout
= timer_start
+ tmout_pat
;
2122 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2124 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2127 if (status
& ATA_BUSY
)
2128 printk(KERN_WARNING
"ata%u is slow to respond, "
2129 "please be patient\n", ap
->id
);
2131 timeout
= timer_start
+ tmout
;
2132 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2134 status
= ata_chk_status(ap
);
2137 if (status
& ATA_BUSY
) {
2138 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
2139 ap
->id
, tmout
/ HZ
);
2146 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2148 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2149 unsigned int dev0
= devmask
& (1 << 0);
2150 unsigned int dev1
= devmask
& (1 << 1);
2151 unsigned long timeout
;
2153 /* if device 0 was found in ata_devchk, wait for its
2157 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2159 /* if device 1 was found in ata_devchk, wait for
2160 * register access, then wait for BSY to clear
2162 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2166 ap
->ops
->dev_select(ap
, 1);
2167 if (ap
->flags
& ATA_FLAG_MMIO
) {
2168 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2169 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2171 nsect
= inb(ioaddr
->nsect_addr
);
2172 lbal
= inb(ioaddr
->lbal_addr
);
2174 if ((nsect
== 1) && (lbal
== 1))
2176 if (time_after(jiffies
, timeout
)) {
2180 msleep(50); /* give drive a breather */
2183 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2185 /* is all this really necessary? */
2186 ap
->ops
->dev_select(ap
, 0);
2188 ap
->ops
->dev_select(ap
, 1);
2190 ap
->ops
->dev_select(ap
, 0);
2193 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2194 unsigned int devmask
)
2196 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2198 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2200 /* software reset. causes dev0 to be selected */
2201 if (ap
->flags
& ATA_FLAG_MMIO
) {
2202 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2203 udelay(20); /* FIXME: flush */
2204 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2205 udelay(20); /* FIXME: flush */
2206 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2208 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2210 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2212 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2215 /* spec mandates ">= 2ms" before checking status.
2216 * We wait 150ms, because that was the magic delay used for
2217 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2218 * between when the ATA command register is written, and then
2219 * status is checked. Because waiting for "a while" before
2220 * checking status is fine, post SRST, we perform this magic
2221 * delay here as well.
2223 * Old drivers/ide uses the 2mS rule and then waits for ready
2227 /* Before we perform post reset processing we want to see if
2228 * the bus shows 0xFF because the odd clown forgets the D7
2229 * pulldown resistor.
2231 if (ata_check_status(ap
) == 0xFF)
2232 return AC_ERR_OTHER
;
2234 ata_bus_post_reset(ap
, devmask
);
2240 * ata_bus_reset - reset host port and associated ATA channel
2241 * @ap: port to reset
2243 * This is typically the first time we actually start issuing
2244 * commands to the ATA channel. We wait for BSY to clear, then
2245 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2246 * result. Determine what devices, if any, are on the channel
2247 * by looking at the device 0/1 error register. Look at the signature
2248 * stored in each device's taskfile registers, to determine if
2249 * the device is ATA or ATAPI.
2252 * PCI/etc. bus probe sem.
2253 * Obtains host_set lock.
2256 * Sets ATA_FLAG_DISABLED if bus reset fails.
2259 void ata_bus_reset(struct ata_port
*ap
)
2261 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2262 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2264 unsigned int dev0
, dev1
= 0, devmask
= 0;
2266 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2268 /* determine if device 0/1 are present */
2269 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2272 dev0
= ata_devchk(ap
, 0);
2274 dev1
= ata_devchk(ap
, 1);
2278 devmask
|= (1 << 0);
2280 devmask
|= (1 << 1);
2282 /* select device 0 again */
2283 ap
->ops
->dev_select(ap
, 0);
2285 /* issue bus reset */
2286 if (ap
->flags
& ATA_FLAG_SRST
)
2287 if (ata_bus_softreset(ap
, devmask
))
2291 * determine by signature whether we have ATA or ATAPI devices
2293 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2294 if ((slave_possible
) && (err
!= 0x81))
2295 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2297 /* re-enable interrupts */
2298 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2301 /* is double-select really necessary? */
2302 if (ap
->device
[1].class != ATA_DEV_NONE
)
2303 ap
->ops
->dev_select(ap
, 1);
2304 if (ap
->device
[0].class != ATA_DEV_NONE
)
2305 ap
->ops
->dev_select(ap
, 0);
2307 /* if no devices were detected, disable this port */
2308 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2309 (ap
->device
[1].class == ATA_DEV_NONE
))
2312 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2313 /* set up device control for ATA_FLAG_SATA_RESET */
2314 if (ap
->flags
& ATA_FLAG_MMIO
)
2315 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2317 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2324 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2325 ap
->ops
->port_disable(ap
);
2330 static int sata_phy_resume(struct ata_port
*ap
)
2332 unsigned long timeout
= jiffies
+ (HZ
* 5);
2333 u32 scontrol
, sstatus
;
2335 scontrol
= scr_read(ap
, SCR_CONTROL
);
2336 scontrol
= (scontrol
& 0x0f0) | 0x300;
2337 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2339 /* Wait for phy to become ready, if necessary. */
2342 sstatus
= scr_read(ap
, SCR_STATUS
);
2343 if ((sstatus
& 0xf) != 1)
2345 } while (time_before(jiffies
, timeout
));
2351 * ata_std_probeinit - initialize probing
2352 * @ap: port to be probed
2354 * @ap is about to be probed. Initialize it. This function is
2355 * to be used as standard callback for ata_drive_probe_reset().
2357 * NOTE!!! Do not use this function as probeinit if a low level
2358 * driver implements only hardreset. Just pass NULL as probeinit
2359 * in that case. Using this function is probably okay but doing
2360 * so makes reset sequence different from the original
2361 * ->phy_reset implementation and Jeff nervous. :-P
2363 void ata_std_probeinit(struct ata_port
*ap
)
2365 if ((ap
->flags
& ATA_FLAG_SATA
) && ap
->ops
->scr_read
) {
2368 sata_phy_resume(ap
);
2370 spd
= (scr_read(ap
, SCR_CONTROL
) & 0xf0) >> 4;
2372 ap
->sata_spd_limit
&= (1 << spd
) - 1;
2374 if (sata_dev_present(ap
))
2375 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2380 * ata_std_softreset - reset host port via ATA SRST
2381 * @ap: port to reset
2382 * @verbose: fail verbosely
2383 * @classes: resulting classes of attached devices
2385 * Reset host port using ATA SRST. This function is to be used
2386 * as standard callback for ata_drive_*_reset() functions.
2389 * Kernel thread context (may sleep)
2392 * 0 on success, -errno otherwise.
2394 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2396 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2397 unsigned int devmask
= 0, err_mask
;
2402 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2403 classes
[0] = ATA_DEV_NONE
;
2407 /* determine if device 0/1 are present */
2408 if (ata_devchk(ap
, 0))
2409 devmask
|= (1 << 0);
2410 if (slave_possible
&& ata_devchk(ap
, 1))
2411 devmask
|= (1 << 1);
2413 /* select device 0 again */
2414 ap
->ops
->dev_select(ap
, 0);
2416 /* issue bus reset */
2417 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2418 err_mask
= ata_bus_softreset(ap
, devmask
);
2421 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2424 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2429 /* determine by signature whether we have ATA or ATAPI devices */
2430 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2431 if (slave_possible
&& err
!= 0x81)
2432 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2435 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2440 * sata_std_hardreset - reset host port via SATA phy reset
2441 * @ap: port to reset
2442 * @verbose: fail verbosely
2443 * @class: resulting class of attached device
2445 * SATA phy-reset host port using DET bits of SControl register.
2446 * This function is to be used as standard callback for
2447 * ata_drive_*_reset().
2450 * Kernel thread context (may sleep)
2453 * 0 on success, -errno otherwise.
2455 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2461 if (ata_set_sata_spd_needed(ap
)) {
2462 /* SATA spec says nothing about how to reconfigure
2463 * spd. To be on the safe side, turn off phy during
2464 * reconfiguration. This works for at least ICH7 AHCI
2467 scontrol
= scr_read(ap
, SCR_CONTROL
);
2468 scontrol
= (scontrol
& 0x0f0) | 0x302;
2469 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2471 ata_set_sata_spd(ap
);
2474 /* issue phy wake/reset */
2475 scontrol
= scr_read(ap
, SCR_CONTROL
);
2476 scontrol
= (scontrol
& 0x0f0) | 0x301;
2477 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2479 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2480 * 10.4.2 says at least 1 ms.
2484 /* bring phy back */
2485 sata_phy_resume(ap
);
2487 /* TODO: phy layer with polling, timeouts, etc. */
2488 if (!sata_dev_present(ap
)) {
2489 *class = ATA_DEV_NONE
;
2490 DPRINTK("EXIT, link offline\n");
2494 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2496 printk(KERN_ERR
"ata%u: COMRESET failed "
2497 "(device not ready)\n", ap
->id
);
2499 DPRINTK("EXIT, device not ready\n");
2503 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2505 *class = ata_dev_try_classify(ap
, 0, NULL
);
2507 DPRINTK("EXIT, class=%u\n", *class);
2512 * ata_std_postreset - standard postreset callback
2513 * @ap: the target ata_port
2514 * @classes: classes of attached devices
2516 * This function is invoked after a successful reset. Note that
2517 * the device might have been reset more than once using
2518 * different reset methods before postreset is invoked.
2520 * This function is to be used as standard callback for
2521 * ata_drive_*_reset().
2524 * Kernel thread context (may sleep)
2526 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2530 /* set cable type if it isn't already set */
2531 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2532 ap
->cbl
= ATA_CBL_SATA
;
2534 /* print link status */
2535 if (ap
->cbl
== ATA_CBL_SATA
)
2536 sata_print_link_status(ap
);
2538 /* re-enable interrupts */
2539 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2542 /* is double-select really necessary? */
2543 if (classes
[0] != ATA_DEV_NONE
)
2544 ap
->ops
->dev_select(ap
, 1);
2545 if (classes
[1] != ATA_DEV_NONE
)
2546 ap
->ops
->dev_select(ap
, 0);
2548 /* bail out if no device is present */
2549 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2550 DPRINTK("EXIT, no device\n");
2554 /* set up device control */
2555 if (ap
->ioaddr
.ctl_addr
) {
2556 if (ap
->flags
& ATA_FLAG_MMIO
)
2557 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2559 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2566 * ata_std_probe_reset - standard probe reset method
2567 * @ap: prot to perform probe-reset
2568 * @classes: resulting classes of attached devices
2570 * The stock off-the-shelf ->probe_reset method.
2573 * Kernel thread context (may sleep)
2576 * 0 on success, -errno otherwise.
2578 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2580 ata_reset_fn_t hardreset
;
2583 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2584 hardreset
= sata_std_hardreset
;
2586 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2587 ata_std_softreset
, hardreset
,
2588 ata_std_postreset
, classes
);
2591 int ata_do_reset(struct ata_port
*ap
,
2592 ata_reset_fn_t reset
, ata_postreset_fn_t postreset
,
2593 int verbose
, unsigned int *classes
)
2597 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2598 classes
[i
] = ATA_DEV_UNKNOWN
;
2600 rc
= reset(ap
, verbose
, classes
);
2604 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2605 * is complete and convert all ATA_DEV_UNKNOWN to
2608 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2609 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2612 if (i
< ATA_MAX_DEVICES
)
2613 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2614 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2615 classes
[i
] = ATA_DEV_NONE
;
2618 postreset(ap
, classes
);
2624 * ata_drive_probe_reset - Perform probe reset with given methods
2625 * @ap: port to reset
2626 * @probeinit: probeinit method (can be NULL)
2627 * @softreset: softreset method (can be NULL)
2628 * @hardreset: hardreset method (can be NULL)
2629 * @postreset: postreset method (can be NULL)
2630 * @classes: resulting classes of attached devices
2632 * Reset the specified port and classify attached devices using
2633 * given methods. This function prefers softreset but tries all
2634 * possible reset sequences to reset and classify devices. This
2635 * function is intended to be used for constructing ->probe_reset
2636 * callback by low level drivers.
2638 * Reset methods should follow the following rules.
2640 * - Return 0 on sucess, -errno on failure.
2641 * - If classification is supported, fill classes[] with
2642 * recognized class codes.
2643 * - If classification is not supported, leave classes[] alone.
2644 * - If verbose is non-zero, print error message on failure;
2645 * otherwise, shut up.
2648 * Kernel thread context (may sleep)
2651 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2652 * if classification fails, and any error code from reset
2655 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2656 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2657 ata_postreset_fn_t postreset
, unsigned int *classes
)
2664 if (softreset
&& !ata_set_sata_spd_needed(ap
)) {
2665 rc
= ata_do_reset(ap
, softreset
, postreset
, 0, classes
);
2666 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2668 printk(KERN_INFO
"ata%u: softreset failed, will try "
2669 "hardreset in 5 secs\n", ap
->id
);
2677 rc
= ata_do_reset(ap
, hardreset
, postreset
, 0, classes
);
2679 if (classes
[0] != ATA_DEV_UNKNOWN
)
2684 if (ata_down_sata_spd_limit(ap
))
2687 printk(KERN_INFO
"ata%u: hardreset failed, will retry "
2688 "in 5 secs\n", ap
->id
);
2693 printk(KERN_INFO
"ata%u: hardreset succeeded without "
2694 "classification, will retry softreset in 5 secs\n",
2698 rc
= ata_do_reset(ap
, softreset
, postreset
, 0, classes
);
2702 if (rc
== 0 && classes
[0] == ATA_DEV_UNKNOWN
)
2708 * ata_dev_same_device - Determine whether new ID matches configured device
2709 * @ap: port on which the device to compare against resides
2710 * @dev: device to compare against
2711 * @new_class: class of the new device
2712 * @new_id: IDENTIFY page of the new device
2714 * Compare @new_class and @new_id against @dev and determine
2715 * whether @dev is the device indicated by @new_class and
2722 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2724 static int ata_dev_same_device(struct ata_port
*ap
, struct ata_device
*dev
,
2725 unsigned int new_class
, const u16
*new_id
)
2727 const u16
*old_id
= dev
->id
;
2728 unsigned char model
[2][41], serial
[2][21];
2731 if (dev
->class != new_class
) {
2733 "ata%u: dev %u class mismatch %d != %d\n",
2734 ap
->id
, dev
->devno
, dev
->class, new_class
);
2738 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2739 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2740 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2741 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2742 new_n_sectors
= ata_id_n_sectors(new_id
);
2744 if (strcmp(model
[0], model
[1])) {
2746 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2747 ap
->id
, dev
->devno
, model
[0], model
[1]);
2751 if (strcmp(serial
[0], serial
[1])) {
2753 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2754 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2758 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2760 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2761 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2762 (unsigned long long)new_n_sectors
);
2770 * ata_dev_revalidate - Revalidate ATA device
2771 * @ap: port on which the device to revalidate resides
2772 * @dev: device to revalidate
2773 * @post_reset: is this revalidation after reset?
2775 * Re-read IDENTIFY page and make sure @dev is still attached to
2779 * Kernel thread context (may sleep)
2782 * 0 on success, negative errno otherwise
2784 int ata_dev_revalidate(struct ata_port
*ap
, struct ata_device
*dev
,
2787 unsigned int class = dev
->class;
2791 if (!ata_dev_enabled(dev
)) {
2796 /* allocate & read ID data */
2797 rc
= ata_dev_read_id(ap
, dev
, &class, post_reset
, &id
);
2801 /* is the device still there? */
2802 if (!ata_dev_same_device(ap
, dev
, class, id
)) {
2810 /* configure device according to the new ID */
2811 rc
= ata_dev_configure(ap
, dev
, 0);
2816 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2817 ap
->id
, dev
->devno
, rc
);
2822 static const char * const ata_dma_blacklist
[] = {
2823 "WDC AC11000H", NULL
,
2824 "WDC AC22100H", NULL
,
2825 "WDC AC32500H", NULL
,
2826 "WDC AC33100H", NULL
,
2827 "WDC AC31600H", NULL
,
2828 "WDC AC32100H", "24.09P07",
2829 "WDC AC23200L", "21.10N21",
2830 "Compaq CRD-8241B", NULL
,
2835 "SanDisk SDP3B", NULL
,
2836 "SanDisk SDP3B-64", NULL
,
2837 "SANYO CD-ROM CRD", NULL
,
2838 "HITACHI CDR-8", NULL
,
2839 "HITACHI CDR-8335", NULL
,
2840 "HITACHI CDR-8435", NULL
,
2841 "Toshiba CD-ROM XM-6202B", NULL
,
2842 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2844 "E-IDE CD-ROM CR-840", NULL
,
2845 "CD-ROM Drive/F5A", NULL
,
2846 "WPI CDD-820", NULL
,
2847 "SAMSUNG CD-ROM SC-148C", NULL
,
2848 "SAMSUNG CD-ROM SC", NULL
,
2849 "SanDisk SDP3B-64", NULL
,
2850 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2851 "_NEC DV5800A", NULL
,
2852 "SAMSUNG CD-ROM SN-124", "N001"
2855 static int ata_strim(char *s
, size_t len
)
2857 len
= strnlen(s
, len
);
2859 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2860 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2867 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2869 unsigned char model_num
[40];
2870 unsigned char model_rev
[16];
2871 unsigned int nlen
, rlen
;
2874 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2876 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2878 nlen
= ata_strim(model_num
, sizeof(model_num
));
2879 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2881 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2882 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2883 if (ata_dma_blacklist
[i
+1] == NULL
)
2885 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2893 * ata_dev_xfermask - Compute supported xfermask of the given device
2894 * @ap: Port on which the device to compute xfermask for resides
2895 * @dev: Device to compute xfermask for
2897 * Compute supported xfermask of @dev and store it in
2898 * dev->*_mask. This function is responsible for applying all
2899 * known limits including host controller limits, device
2902 * FIXME: The current implementation limits all transfer modes to
2903 * the fastest of the lowested device on the port. This is not
2904 * required on most controllers.
2909 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
)
2911 struct ata_host_set
*hs
= ap
->host_set
;
2912 unsigned long xfer_mask
;
2915 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
2916 ap
->mwdma_mask
, ap
->udma_mask
);
2918 /* Apply cable rule here. Don't apply it early because when
2919 * we handle hot plug the cable type can itself change.
2921 if (ap
->cbl
== ATA_CBL_PATA40
)
2922 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2924 /* FIXME: Use port-wide xfermask for now */
2925 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2926 struct ata_device
*d
= &ap
->device
[i
];
2928 if (ata_dev_absent(d
))
2931 if (ata_dev_disabled(d
)) {
2932 /* to avoid violating device selection timing */
2933 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2934 UINT_MAX
, UINT_MAX
);
2938 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2939 d
->mwdma_mask
, d
->udma_mask
);
2940 xfer_mask
&= ata_id_xfermask(d
->id
);
2941 if (ata_dma_blacklisted(d
))
2942 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2945 if (ata_dma_blacklisted(dev
))
2946 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, "
2947 "disabling DMA\n", ap
->id
, dev
->devno
);
2949 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
2950 if (hs
->simplex_claimed
)
2951 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2954 if (ap
->ops
->mode_filter
)
2955 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
2957 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
2958 &dev
->mwdma_mask
, &dev
->udma_mask
);
2962 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2963 * @ap: Port associated with device @dev
2964 * @dev: Device to which command will be sent
2966 * Issue SET FEATURES - XFER MODE command to device @dev
2970 * PCI/etc. bus probe sem.
2973 * 0 on success, AC_ERR_* mask otherwise.
2976 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
2977 struct ata_device
*dev
)
2979 struct ata_taskfile tf
;
2980 unsigned int err_mask
;
2982 /* set up set-features taskfile */
2983 DPRINTK("set features - xfer mode\n");
2985 ata_tf_init(ap
, &tf
, dev
->devno
);
2986 tf
.command
= ATA_CMD_SET_FEATURES
;
2987 tf
.feature
= SETFEATURES_XFER
;
2988 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2989 tf
.protocol
= ATA_PROT_NODATA
;
2990 tf
.nsect
= dev
->xfer_mode
;
2992 err_mask
= ata_exec_internal(ap
, dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
2994 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2999 * ata_dev_init_params - Issue INIT DEV PARAMS command
3000 * @ap: Port associated with device @dev
3001 * @dev: Device to which command will be sent
3004 * Kernel thread context (may sleep)
3007 * 0 on success, AC_ERR_* mask otherwise.
3010 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
3011 struct ata_device
*dev
,
3015 struct ata_taskfile tf
;
3016 unsigned int err_mask
;
3018 /* Number of sectors per track 1-255. Number of heads 1-16 */
3019 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3020 return AC_ERR_INVALID
;
3022 /* set up init dev params taskfile */
3023 DPRINTK("init dev params \n");
3025 ata_tf_init(ap
, &tf
, dev
->devno
);
3026 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3027 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3028 tf
.protocol
= ATA_PROT_NODATA
;
3030 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3032 err_mask
= ata_exec_internal(ap
, dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3034 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3039 * ata_sg_clean - Unmap DMA memory associated with command
3040 * @qc: Command containing DMA memory to be released
3042 * Unmap all mapped DMA memory associated with this command.
3045 * spin_lock_irqsave(host_set lock)
3048 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3050 struct ata_port
*ap
= qc
->ap
;
3051 struct scatterlist
*sg
= qc
->__sg
;
3052 int dir
= qc
->dma_dir
;
3053 void *pad_buf
= NULL
;
3055 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3056 WARN_ON(sg
== NULL
);
3058 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3059 WARN_ON(qc
->n_elem
> 1);
3061 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3063 /* if we padded the buffer out to 32-bit bound, and data
3064 * xfer direction is from-device, we must copy from the
3065 * pad buffer back into the supplied buffer
3067 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3068 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3070 if (qc
->flags
& ATA_QCFLAG_SG
) {
3072 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3073 /* restore last sg */
3074 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3076 struct scatterlist
*psg
= &qc
->pad_sgent
;
3077 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3078 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3079 kunmap_atomic(addr
, KM_IRQ0
);
3083 dma_unmap_single(ap
->dev
,
3084 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3087 sg
->length
+= qc
->pad_len
;
3089 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3090 pad_buf
, qc
->pad_len
);
3093 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3098 * ata_fill_sg - Fill PCI IDE PRD table
3099 * @qc: Metadata associated with taskfile to be transferred
3101 * Fill PCI IDE PRD (scatter-gather) table with segments
3102 * associated with the current disk command.
3105 * spin_lock_irqsave(host_set lock)
3108 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3110 struct ata_port
*ap
= qc
->ap
;
3111 struct scatterlist
*sg
;
3114 WARN_ON(qc
->__sg
== NULL
);
3115 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3118 ata_for_each_sg(sg
, qc
) {
3122 /* determine if physical DMA addr spans 64K boundary.
3123 * Note h/w doesn't support 64-bit, so we unconditionally
3124 * truncate dma_addr_t to u32.
3126 addr
= (u32
) sg_dma_address(sg
);
3127 sg_len
= sg_dma_len(sg
);
3130 offset
= addr
& 0xffff;
3132 if ((offset
+ sg_len
) > 0x10000)
3133 len
= 0x10000 - offset
;
3135 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3136 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3137 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3146 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3149 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3150 * @qc: Metadata associated with taskfile to check
3152 * Allow low-level driver to filter ATA PACKET commands, returning
3153 * a status indicating whether or not it is OK to use DMA for the
3154 * supplied PACKET command.
3157 * spin_lock_irqsave(host_set lock)
3159 * RETURNS: 0 when ATAPI DMA can be used
3162 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3164 struct ata_port
*ap
= qc
->ap
;
3165 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3167 if (ap
->ops
->check_atapi_dma
)
3168 rc
= ap
->ops
->check_atapi_dma(qc
);
3173 * ata_qc_prep - Prepare taskfile for submission
3174 * @qc: Metadata associated with taskfile to be prepared
3176 * Prepare ATA taskfile for submission.
3179 * spin_lock_irqsave(host_set lock)
3181 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3183 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3189 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3192 * ata_sg_init_one - Associate command with memory buffer
3193 * @qc: Command to be associated
3194 * @buf: Memory buffer
3195 * @buflen: Length of memory buffer, in bytes.
3197 * Initialize the data-related elements of queued_cmd @qc
3198 * to point to a single memory buffer, @buf of byte length @buflen.
3201 * spin_lock_irqsave(host_set lock)
3204 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3206 struct scatterlist
*sg
;
3208 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3210 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3211 qc
->__sg
= &qc
->sgent
;
3213 qc
->orig_n_elem
= 1;
3217 sg_init_one(sg
, buf
, buflen
);
3221 * ata_sg_init - Associate command with scatter-gather table.
3222 * @qc: Command to be associated
3223 * @sg: Scatter-gather table.
3224 * @n_elem: Number of elements in s/g table.
3226 * Initialize the data-related elements of queued_cmd @qc
3227 * to point to a scatter-gather table @sg, containing @n_elem
3231 * spin_lock_irqsave(host_set lock)
3234 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3235 unsigned int n_elem
)
3237 qc
->flags
|= ATA_QCFLAG_SG
;
3239 qc
->n_elem
= n_elem
;
3240 qc
->orig_n_elem
= n_elem
;
3244 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3245 * @qc: Command with memory buffer to be mapped.
3247 * DMA-map the memory buffer associated with queued_cmd @qc.
3250 * spin_lock_irqsave(host_set lock)
3253 * Zero on success, negative on error.
3256 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3258 struct ata_port
*ap
= qc
->ap
;
3259 int dir
= qc
->dma_dir
;
3260 struct scatterlist
*sg
= qc
->__sg
;
3261 dma_addr_t dma_address
;
3264 /* we must lengthen transfers to end on a 32-bit boundary */
3265 qc
->pad_len
= sg
->length
& 3;
3267 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3268 struct scatterlist
*psg
= &qc
->pad_sgent
;
3270 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3272 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3274 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3275 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3278 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3279 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3281 sg
->length
-= qc
->pad_len
;
3282 if (sg
->length
== 0)
3285 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3286 sg
->length
, qc
->pad_len
);
3294 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3296 if (dma_mapping_error(dma_address
)) {
3298 sg
->length
+= qc
->pad_len
;
3302 sg_dma_address(sg
) = dma_address
;
3303 sg_dma_len(sg
) = sg
->length
;
3306 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3307 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3313 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3314 * @qc: Command with scatter-gather table to be mapped.
3316 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3319 * spin_lock_irqsave(host_set lock)
3322 * Zero on success, negative on error.
3326 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3328 struct ata_port
*ap
= qc
->ap
;
3329 struct scatterlist
*sg
= qc
->__sg
;
3330 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3331 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3333 VPRINTK("ENTER, ata%u\n", ap
->id
);
3334 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3336 /* we must lengthen transfers to end on a 32-bit boundary */
3337 qc
->pad_len
= lsg
->length
& 3;
3339 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3340 struct scatterlist
*psg
= &qc
->pad_sgent
;
3341 unsigned int offset
;
3343 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3345 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3348 * psg->page/offset are used to copy to-be-written
3349 * data in this function or read data in ata_sg_clean.
3351 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3352 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3353 psg
->offset
= offset_in_page(offset
);
3355 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3356 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3357 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3358 kunmap_atomic(addr
, KM_IRQ0
);
3361 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3362 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3364 lsg
->length
-= qc
->pad_len
;
3365 if (lsg
->length
== 0)
3368 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3369 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3372 pre_n_elem
= qc
->n_elem
;
3373 if (trim_sg
&& pre_n_elem
)
3382 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3384 /* restore last sg */
3385 lsg
->length
+= qc
->pad_len
;
3389 DPRINTK("%d sg elements mapped\n", n_elem
);
3392 qc
->n_elem
= n_elem
;
3398 * ata_poll_qc_complete - turn irq back on and finish qc
3399 * @qc: Command to complete
3400 * @err_mask: ATA status register content
3403 * None. (grabs host lock)
3406 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3408 struct ata_port
*ap
= qc
->ap
;
3409 unsigned long flags
;
3411 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3412 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3414 ata_qc_complete(qc
);
3415 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3419 * ata_pio_poll - poll using PIO, depending on current state
3420 * @qc: qc in progress
3423 * None. (executing in kernel thread context)
3426 * timeout value to use
3428 static unsigned long ata_pio_poll(struct ata_queued_cmd
*qc
)
3430 struct ata_port
*ap
= qc
->ap
;
3432 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3433 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3435 switch (ap
->hsm_task_state
) {
3438 poll_state
= HSM_ST_POLL
;
3442 case HSM_ST_LAST_POLL
:
3443 poll_state
= HSM_ST_LAST_POLL
;
3444 reg_state
= HSM_ST_LAST
;
3451 status
= ata_chk_status(ap
);
3452 if (status
& ATA_BUSY
) {
3453 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3454 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3455 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3458 ap
->hsm_task_state
= poll_state
;
3459 return ATA_SHORT_PAUSE
;
3462 ap
->hsm_task_state
= reg_state
;
3467 * ata_pio_complete - check if drive is busy or idle
3468 * @qc: qc to complete
3471 * None. (executing in kernel thread context)
3474 * Non-zero if qc completed, zero otherwise.
3476 static int ata_pio_complete(struct ata_queued_cmd
*qc
)
3478 struct ata_port
*ap
= qc
->ap
;
3482 * This is purely heuristic. This is a fast path. Sometimes when
3483 * we enter, BSY will be cleared in a chk-status or two. If not,
3484 * the drive is probably seeking or something. Snooze for a couple
3485 * msecs, then chk-status again. If still busy, fall back to
3486 * HSM_ST_POLL state.
3488 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3489 if (drv_stat
& ATA_BUSY
) {
3491 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3492 if (drv_stat
& ATA_BUSY
) {
3493 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3494 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3499 drv_stat
= ata_wait_idle(ap
);
3500 if (!ata_ok(drv_stat
)) {
3501 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3502 ap
->hsm_task_state
= HSM_ST_ERR
;
3506 ap
->hsm_task_state
= HSM_ST_IDLE
;
3508 WARN_ON(qc
->err_mask
);
3509 ata_poll_qc_complete(qc
);
3511 /* another command may start at this point */
3518 * swap_buf_le16 - swap halves of 16-bit words in place
3519 * @buf: Buffer to swap
3520 * @buf_words: Number of 16-bit words in buffer.
3522 * Swap halves of 16-bit words if needed to convert from
3523 * little-endian byte order to native cpu byte order, or
3527 * Inherited from caller.
3529 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3534 for (i
= 0; i
< buf_words
; i
++)
3535 buf
[i
] = le16_to_cpu(buf
[i
]);
3536 #endif /* __BIG_ENDIAN */
3540 * ata_mmio_data_xfer - Transfer data by MMIO
3541 * @ap: port to read/write
3543 * @buflen: buffer length
3544 * @write_data: read/write
3546 * Transfer data from/to the device data register by MMIO.
3549 * Inherited from caller.
3552 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3553 unsigned int buflen
, int write_data
)
3556 unsigned int words
= buflen
>> 1;
3557 u16
*buf16
= (u16
*) buf
;
3558 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3560 /* Transfer multiple of 2 bytes */
3562 for (i
= 0; i
< words
; i
++)
3563 writew(le16_to_cpu(buf16
[i
]), mmio
);
3565 for (i
= 0; i
< words
; i
++)
3566 buf16
[i
] = cpu_to_le16(readw(mmio
));
3569 /* Transfer trailing 1 byte, if any. */
3570 if (unlikely(buflen
& 0x01)) {
3571 u16 align_buf
[1] = { 0 };
3572 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3575 memcpy(align_buf
, trailing_buf
, 1);
3576 writew(le16_to_cpu(align_buf
[0]), mmio
);
3578 align_buf
[0] = cpu_to_le16(readw(mmio
));
3579 memcpy(trailing_buf
, align_buf
, 1);
3585 * ata_pio_data_xfer - Transfer data by PIO
3586 * @ap: port to read/write
3588 * @buflen: buffer length
3589 * @write_data: read/write
3591 * Transfer data from/to the device data register by PIO.
3594 * Inherited from caller.
3597 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3598 unsigned int buflen
, int write_data
)
3600 unsigned int words
= buflen
>> 1;
3602 /* Transfer multiple of 2 bytes */
3604 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3606 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3608 /* Transfer trailing 1 byte, if any. */
3609 if (unlikely(buflen
& 0x01)) {
3610 u16 align_buf
[1] = { 0 };
3611 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3614 memcpy(align_buf
, trailing_buf
, 1);
3615 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3617 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3618 memcpy(trailing_buf
, align_buf
, 1);
3624 * ata_data_xfer - Transfer data from/to the data register.
3625 * @ap: port to read/write
3627 * @buflen: buffer length
3628 * @do_write: read/write
3630 * Transfer data from/to the device data register.
3633 * Inherited from caller.
3636 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3637 unsigned int buflen
, int do_write
)
3639 /* Make the crap hardware pay the costs not the good stuff */
3640 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3641 unsigned long flags
;
3642 local_irq_save(flags
);
3643 if (ap
->flags
& ATA_FLAG_MMIO
)
3644 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3646 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3647 local_irq_restore(flags
);
3649 if (ap
->flags
& ATA_FLAG_MMIO
)
3650 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3652 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3657 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3658 * @qc: Command on going
3660 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3663 * Inherited from caller.
3666 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3668 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3669 struct scatterlist
*sg
= qc
->__sg
;
3670 struct ata_port
*ap
= qc
->ap
;
3672 unsigned int offset
;
3675 if (qc
->cursect
== (qc
->nsect
- 1))
3676 ap
->hsm_task_state
= HSM_ST_LAST
;
3678 page
= sg
[qc
->cursg
].page
;
3679 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3681 /* get the current page and offset */
3682 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3683 offset
%= PAGE_SIZE
;
3685 buf
= kmap(page
) + offset
;
3690 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3695 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3697 /* do the actual data transfer */
3698 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3699 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3705 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3706 * @qc: Command on going
3707 * @bytes: number of bytes
3709 * Transfer Transfer data from/to the ATAPI device.
3712 * Inherited from caller.
3716 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3718 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3719 struct scatterlist
*sg
= qc
->__sg
;
3720 struct ata_port
*ap
= qc
->ap
;
3723 unsigned int offset
, count
;
3725 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3726 ap
->hsm_task_state
= HSM_ST_LAST
;
3729 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3731 * The end of qc->sg is reached and the device expects
3732 * more data to transfer. In order not to overrun qc->sg
3733 * and fulfill length specified in the byte count register,
3734 * - for read case, discard trailing data from the device
3735 * - for write case, padding zero data to the device
3737 u16 pad_buf
[1] = { 0 };
3738 unsigned int words
= bytes
>> 1;
3741 if (words
) /* warning if bytes > 1 */
3742 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3745 for (i
= 0; i
< words
; i
++)
3746 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3748 ap
->hsm_task_state
= HSM_ST_LAST
;
3752 sg
= &qc
->__sg
[qc
->cursg
];
3755 offset
= sg
->offset
+ qc
->cursg_ofs
;
3757 /* get the current page and offset */
3758 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3759 offset
%= PAGE_SIZE
;
3761 /* don't overrun current sg */
3762 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3764 /* don't cross page boundaries */
3765 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3767 buf
= kmap(page
) + offset
;
3770 qc
->curbytes
+= count
;
3771 qc
->cursg_ofs
+= count
;
3773 if (qc
->cursg_ofs
== sg
->length
) {
3778 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3780 /* do the actual data transfer */
3781 ata_data_xfer(ap
, buf
, count
, do_write
);
3790 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3791 * @qc: Command on going
3793 * Transfer Transfer data from/to the ATAPI device.
3796 * Inherited from caller.
3799 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3801 struct ata_port
*ap
= qc
->ap
;
3802 struct ata_device
*dev
= qc
->dev
;
3803 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3804 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3806 ap
->ops
->tf_read(ap
, &qc
->tf
);
3807 ireason
= qc
->tf
.nsect
;
3808 bc_lo
= qc
->tf
.lbam
;
3809 bc_hi
= qc
->tf
.lbah
;
3810 bytes
= (bc_hi
<< 8) | bc_lo
;
3812 /* shall be cleared to zero, indicating xfer of data */
3813 if (ireason
& (1 << 0))
3816 /* make sure transfer direction matches expected */
3817 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3818 if (do_write
!= i_write
)
3821 __atapi_pio_bytes(qc
, bytes
);
3826 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3827 ap
->id
, dev
->devno
);
3828 qc
->err_mask
|= AC_ERR_HSM
;
3829 ap
->hsm_task_state
= HSM_ST_ERR
;
3833 * ata_pio_block - start PIO on a block
3834 * @qc: qc to transfer block for
3837 * None. (executing in kernel thread context)
3839 static void ata_pio_block(struct ata_queued_cmd
*qc
)
3841 struct ata_port
*ap
= qc
->ap
;
3845 * This is purely heuristic. This is a fast path.
3846 * Sometimes when we enter, BSY will be cleared in
3847 * a chk-status or two. If not, the drive is probably seeking
3848 * or something. Snooze for a couple msecs, then
3849 * chk-status again. If still busy, fall back to
3850 * HSM_ST_POLL state.
3852 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3853 if (status
& ATA_BUSY
) {
3855 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3856 if (status
& ATA_BUSY
) {
3857 ap
->hsm_task_state
= HSM_ST_POLL
;
3858 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3864 if (status
& (ATA_ERR
| ATA_DF
)) {
3865 qc
->err_mask
|= AC_ERR_DEV
;
3866 ap
->hsm_task_state
= HSM_ST_ERR
;
3870 /* transfer data if any */
3871 if (is_atapi_taskfile(&qc
->tf
)) {
3872 /* DRQ=0 means no more data to transfer */
3873 if ((status
& ATA_DRQ
) == 0) {
3874 ap
->hsm_task_state
= HSM_ST_LAST
;
3878 atapi_pio_bytes(qc
);
3880 /* handle BSY=0, DRQ=0 as error */
3881 if ((status
& ATA_DRQ
) == 0) {
3882 qc
->err_mask
|= AC_ERR_HSM
;
3883 ap
->hsm_task_state
= HSM_ST_ERR
;
3891 static void ata_pio_error(struct ata_queued_cmd
*qc
)
3893 struct ata_port
*ap
= qc
->ap
;
3895 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3896 printk(KERN_WARNING
"ata%u: dev %u PIO error\n",
3897 ap
->id
, qc
->dev
->devno
);
3899 /* make sure qc->err_mask is available to
3900 * know what's wrong and recover
3902 WARN_ON(qc
->err_mask
== 0);
3904 ap
->hsm_task_state
= HSM_ST_IDLE
;
3906 ata_poll_qc_complete(qc
);
3909 static void ata_pio_task(void *_data
)
3911 struct ata_queued_cmd
*qc
= _data
;
3912 struct ata_port
*ap
= qc
->ap
;
3913 unsigned long timeout
;
3920 switch (ap
->hsm_task_state
) {
3929 qc_completed
= ata_pio_complete(qc
);
3933 case HSM_ST_LAST_POLL
:
3934 timeout
= ata_pio_poll(qc
);
3944 ata_port_queue_task(ap
, ata_pio_task
, qc
, timeout
);
3945 else if (!qc_completed
)
3950 * atapi_packet_task - Write CDB bytes to hardware
3951 * @_data: qc in progress
3953 * When device has indicated its readiness to accept
3954 * a CDB, this function is called. Send the CDB.
3955 * If DMA is to be performed, exit immediately.
3956 * Otherwise, we are in polling mode, so poll
3957 * status under operation succeeds or fails.
3960 * Kernel thread context (may sleep)
3962 static void atapi_packet_task(void *_data
)
3964 struct ata_queued_cmd
*qc
= _data
;
3965 struct ata_port
*ap
= qc
->ap
;
3968 /* sleep-wait for BSY to clear */
3969 DPRINTK("busy wait\n");
3970 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3971 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3975 /* make sure DRQ is set */
3976 status
= ata_chk_status(ap
);
3977 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3978 qc
->err_mask
|= AC_ERR_HSM
;
3983 DPRINTK("send cdb\n");
3984 WARN_ON(qc
->dev
->cdb_len
< 12);
3986 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
3987 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
3988 unsigned long flags
;
3990 /* Once we're done issuing command and kicking bmdma,
3991 * irq handler takes over. To not lose irq, we need
3992 * to clear NOINTR flag before sending cdb, but
3993 * interrupt handler shouldn't be invoked before we're
3994 * finished. Hence, the following locking.
3996 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3997 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3998 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
3999 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4000 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4001 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4003 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4005 /* PIO commands are handled by polling */
4006 ap
->hsm_task_state
= HSM_ST
;
4007 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4013 ata_poll_qc_complete(qc
);
4017 * ata_qc_new - Request an available ATA command, for queueing
4018 * @ap: Port associated with device @dev
4019 * @dev: Device from whom we request an available command structure
4025 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4027 struct ata_queued_cmd
*qc
= NULL
;
4030 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
4031 if (!test_and_set_bit(i
, &ap
->qactive
)) {
4032 qc
= ata_qc_from_tag(ap
, i
);
4043 * ata_qc_new_init - Request an available ATA command, and initialize it
4044 * @ap: Port associated with device @dev
4045 * @dev: Device from whom we request an available command structure
4051 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
4052 struct ata_device
*dev
)
4054 struct ata_queued_cmd
*qc
;
4056 qc
= ata_qc_new(ap
);
4069 * ata_qc_free - free unused ata_queued_cmd
4070 * @qc: Command to complete
4072 * Designed to free unused ata_queued_cmd object
4073 * in case something prevents using it.
4076 * spin_lock_irqsave(host_set lock)
4078 void ata_qc_free(struct ata_queued_cmd
*qc
)
4080 struct ata_port
*ap
= qc
->ap
;
4083 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4087 if (likely(ata_tag_valid(tag
))) {
4088 if (tag
== ap
->active_tag
)
4089 ap
->active_tag
= ATA_TAG_POISON
;
4090 qc
->tag
= ATA_TAG_POISON
;
4091 clear_bit(tag
, &ap
->qactive
);
4095 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4097 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4098 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4100 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4103 /* atapi: mark qc as inactive to prevent the interrupt handler
4104 * from completing the command twice later, before the error handler
4105 * is called. (when rc != 0 and atapi request sense is needed)
4107 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4109 /* call completion callback */
4110 qc
->complete_fn(qc
);
4113 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4115 struct ata_port
*ap
= qc
->ap
;
4117 switch (qc
->tf
.protocol
) {
4119 case ATA_PROT_ATAPI_DMA
:
4122 case ATA_PROT_ATAPI
:
4124 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4137 * ata_qc_issue - issue taskfile to device
4138 * @qc: command to issue to device
4140 * Prepare an ATA command to submission to device.
4141 * This includes mapping the data into a DMA-able
4142 * area, filling in the S/G table, and finally
4143 * writing the taskfile to hardware, starting the command.
4146 * spin_lock_irqsave(host_set lock)
4148 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4150 struct ata_port
*ap
= qc
->ap
;
4152 qc
->ap
->active_tag
= qc
->tag
;
4153 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4155 if (ata_should_dma_map(qc
)) {
4156 if (qc
->flags
& ATA_QCFLAG_SG
) {
4157 if (ata_sg_setup(qc
))
4159 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4160 if (ata_sg_setup_one(qc
))
4164 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4167 ap
->ops
->qc_prep(qc
);
4169 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4170 if (unlikely(qc
->err_mask
))
4175 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4176 qc
->err_mask
|= AC_ERR_SYSTEM
;
4178 ata_qc_complete(qc
);
4182 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4183 * @qc: command to issue to device
4185 * Using various libata functions and hooks, this function
4186 * starts an ATA command. ATA commands are grouped into
4187 * classes called "protocols", and issuing each type of protocol
4188 * is slightly different.
4190 * May be used as the qc_issue() entry in ata_port_operations.
4193 * spin_lock_irqsave(host_set lock)
4196 * Zero on success, AC_ERR_* mask on failure
4199 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4201 struct ata_port
*ap
= qc
->ap
;
4203 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4205 switch (qc
->tf
.protocol
) {
4206 case ATA_PROT_NODATA
:
4207 ata_tf_to_host(ap
, &qc
->tf
);
4211 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4212 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4213 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4216 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4217 ata_qc_set_polling(qc
);
4218 ata_tf_to_host(ap
, &qc
->tf
);
4219 ap
->hsm_task_state
= HSM_ST
;
4220 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4223 case ATA_PROT_ATAPI
:
4224 ata_qc_set_polling(qc
);
4225 ata_tf_to_host(ap
, &qc
->tf
);
4226 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4229 case ATA_PROT_ATAPI_NODATA
:
4230 ap
->flags
|= ATA_FLAG_NOINTR
;
4231 ata_tf_to_host(ap
, &qc
->tf
);
4232 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4235 case ATA_PROT_ATAPI_DMA
:
4236 ap
->flags
|= ATA_FLAG_NOINTR
;
4237 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4238 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4239 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4244 return AC_ERR_SYSTEM
;
4251 * ata_host_intr - Handle host interrupt for given (port, task)
4252 * @ap: Port on which interrupt arrived (possibly...)
4253 * @qc: Taskfile currently active in engine
4255 * Handle host interrupt for given queued command. Currently,
4256 * only DMA interrupts are handled. All other commands are
4257 * handled via polling with interrupts disabled (nIEN bit).
4260 * spin_lock_irqsave(host_set lock)
4263 * One if interrupt was handled, zero if not (shared irq).
4266 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4267 struct ata_queued_cmd
*qc
)
4269 u8 status
, host_stat
;
4271 switch (qc
->tf
.protocol
) {
4274 case ATA_PROT_ATAPI_DMA
:
4275 case ATA_PROT_ATAPI
:
4276 /* check status of DMA engine */
4277 host_stat
= ap
->ops
->bmdma_status(ap
);
4278 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4280 /* if it's not our irq... */
4281 if (!(host_stat
& ATA_DMA_INTR
))
4284 /* before we do anything else, clear DMA-Start bit */
4285 ap
->ops
->bmdma_stop(qc
);
4289 case ATA_PROT_ATAPI_NODATA
:
4290 case ATA_PROT_NODATA
:
4291 /* check altstatus */
4292 status
= ata_altstatus(ap
);
4293 if (status
& ATA_BUSY
)
4296 /* check main status, clearing INTRQ */
4297 status
= ata_chk_status(ap
);
4298 if (unlikely(status
& ATA_BUSY
))
4300 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4301 ap
->id
, qc
->tf
.protocol
, status
);
4303 /* ack bmdma irq events */
4304 ap
->ops
->irq_clear(ap
);
4306 /* complete taskfile transaction */
4307 qc
->err_mask
|= ac_err_mask(status
);
4308 ata_qc_complete(qc
);
4315 return 1; /* irq handled */
4318 ap
->stats
.idle_irq
++;
4321 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4322 ata_irq_ack(ap
, 0); /* debug trap */
4323 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4327 return 0; /* irq not handled */
4331 * ata_interrupt - Default ATA host interrupt handler
4332 * @irq: irq line (unused)
4333 * @dev_instance: pointer to our ata_host_set information structure
4336 * Default interrupt handler for PCI IDE devices. Calls
4337 * ata_host_intr() for each port that is not disabled.
4340 * Obtains host_set lock during operation.
4343 * IRQ_NONE or IRQ_HANDLED.
4346 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4348 struct ata_host_set
*host_set
= dev_instance
;
4350 unsigned int handled
= 0;
4351 unsigned long flags
;
4353 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4354 spin_lock_irqsave(&host_set
->lock
, flags
);
4356 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4357 struct ata_port
*ap
;
4359 ap
= host_set
->ports
[i
];
4361 !(ap
->flags
& (ATA_FLAG_DISABLED
| ATA_FLAG_NOINTR
))) {
4362 struct ata_queued_cmd
*qc
;
4364 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4365 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4366 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4367 handled
|= ata_host_intr(ap
, qc
);
4371 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4373 return IRQ_RETVAL(handled
);
4378 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4379 * without filling any other registers
4381 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4384 struct ata_taskfile tf
;
4387 ata_tf_init(ap
, &tf
, dev
->devno
);
4390 tf
.flags
|= ATA_TFLAG_DEVICE
;
4391 tf
.protocol
= ATA_PROT_NODATA
;
4393 err
= ata_exec_internal(ap
, dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
4395 printk(KERN_ERR
"%s: ata command failed: %d\n",
4401 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4405 if (!ata_try_flush_cache(dev
))
4408 if (ata_id_has_flush_ext(dev
->id
))
4409 cmd
= ATA_CMD_FLUSH_EXT
;
4411 cmd
= ATA_CMD_FLUSH
;
4413 return ata_do_simple_cmd(ap
, dev
, cmd
);
4416 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4418 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4421 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4423 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4427 * ata_device_resume - wakeup a previously suspended devices
4428 * @ap: port the device is connected to
4429 * @dev: the device to resume
4431 * Kick the drive back into action, by sending it an idle immediate
4432 * command and making sure its transfer mode matches between drive
4436 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4438 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4439 struct ata_device
*failed_dev
;
4440 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4441 while (ata_set_mode(ap
, &failed_dev
))
4442 ata_dev_disable(ap
, failed_dev
);
4444 if (!ata_dev_enabled(dev
))
4446 if (dev
->class == ATA_DEV_ATA
)
4447 ata_start_drive(ap
, dev
);
4453 * ata_device_suspend - prepare a device for suspend
4454 * @ap: port the device is connected to
4455 * @dev: the device to suspend
4457 * Flush the cache on the drive, if appropriate, then issue a
4458 * standbynow command.
4460 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
, pm_message_t state
)
4462 if (!ata_dev_enabled(dev
))
4464 if (dev
->class == ATA_DEV_ATA
)
4465 ata_flush_cache(ap
, dev
);
4467 if (state
.event
!= PM_EVENT_FREEZE
)
4468 ata_standby_drive(ap
, dev
);
4469 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4474 * ata_port_start - Set port up for dma.
4475 * @ap: Port to initialize
4477 * Called just after data structures for each port are
4478 * initialized. Allocates space for PRD table.
4480 * May be used as the port_start() entry in ata_port_operations.
4483 * Inherited from caller.
4486 int ata_port_start (struct ata_port
*ap
)
4488 struct device
*dev
= ap
->dev
;
4491 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4495 rc
= ata_pad_alloc(ap
, dev
);
4497 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4501 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4508 * ata_port_stop - Undo ata_port_start()
4509 * @ap: Port to shut down
4511 * Frees the PRD table.
4513 * May be used as the port_stop() entry in ata_port_operations.
4516 * Inherited from caller.
4519 void ata_port_stop (struct ata_port
*ap
)
4521 struct device
*dev
= ap
->dev
;
4523 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4524 ata_pad_free(ap
, dev
);
4527 void ata_host_stop (struct ata_host_set
*host_set
)
4529 if (host_set
->mmio_base
)
4530 iounmap(host_set
->mmio_base
);
4535 * ata_host_remove - Unregister SCSI host structure with upper layers
4536 * @ap: Port to unregister
4537 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4540 * Inherited from caller.
4543 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4545 struct Scsi_Host
*sh
= ap
->host
;
4550 scsi_remove_host(sh
);
4552 ap
->ops
->port_stop(ap
);
4556 * ata_host_init - Initialize an ata_port structure
4557 * @ap: Structure to initialize
4558 * @host: associated SCSI mid-layer structure
4559 * @host_set: Collection of hosts to which @ap belongs
4560 * @ent: Probe information provided by low-level driver
4561 * @port_no: Port number associated with this ata_port
4563 * Initialize a new ata_port structure, and its associated
4567 * Inherited from caller.
4570 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4571 struct ata_host_set
*host_set
,
4572 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4578 host
->max_channel
= 1;
4579 host
->unique_id
= ata_unique_id
++;
4580 host
->max_cmd_len
= 12;
4582 ap
->flags
= ATA_FLAG_DISABLED
;
4583 ap
->id
= host
->unique_id
;
4585 ap
->ctl
= ATA_DEVCTL_OBS
;
4586 ap
->host_set
= host_set
;
4588 ap
->port_no
= port_no
;
4590 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4591 ap
->pio_mask
= ent
->pio_mask
;
4592 ap
->mwdma_mask
= ent
->mwdma_mask
;
4593 ap
->udma_mask
= ent
->udma_mask
;
4594 ap
->flags
|= ent
->host_flags
;
4595 ap
->ops
= ent
->port_ops
;
4596 ap
->cbl
= ATA_CBL_NONE
;
4597 ap
->sata_spd_limit
= UINT_MAX
;
4598 ap
->active_tag
= ATA_TAG_POISON
;
4599 ap
->last_ctl
= 0xFF;
4601 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4602 INIT_LIST_HEAD(&ap
->eh_done_q
);
4604 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
4605 struct ata_device
*dev
= &ap
->device
[i
];
4607 dev
->pio_mask
= UINT_MAX
;
4608 dev
->mwdma_mask
= UINT_MAX
;
4609 dev
->udma_mask
= UINT_MAX
;
4613 ap
->stats
.unhandled_irq
= 1;
4614 ap
->stats
.idle_irq
= 1;
4617 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4621 * ata_host_add - Attach low-level ATA driver to system
4622 * @ent: Information provided by low-level driver
4623 * @host_set: Collections of ports to which we add
4624 * @port_no: Port number associated with this host
4626 * Attach low-level ATA driver to system.
4629 * PCI/etc. bus probe sem.
4632 * New ata_port on success, for NULL on error.
4635 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4636 struct ata_host_set
*host_set
,
4637 unsigned int port_no
)
4639 struct Scsi_Host
*host
;
4640 struct ata_port
*ap
;
4645 if (!ent
->port_ops
->probe_reset
&&
4646 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
4647 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
4652 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4656 host
->transportt
= &ata_scsi_transport_template
;
4658 ap
= (struct ata_port
*) &host
->hostdata
[0];
4660 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4662 rc
= ap
->ops
->port_start(ap
);
4669 scsi_host_put(host
);
4674 * ata_device_add - Register hardware device with ATA and SCSI layers
4675 * @ent: Probe information describing hardware device to be registered
4677 * This function processes the information provided in the probe
4678 * information struct @ent, allocates the necessary ATA and SCSI
4679 * host information structures, initializes them, and registers
4680 * everything with requisite kernel subsystems.
4682 * This function requests irqs, probes the ATA bus, and probes
4686 * PCI/etc. bus probe sem.
4689 * Number of ports registered. Zero on error (no ports registered).
4692 int ata_device_add(const struct ata_probe_ent
*ent
)
4694 unsigned int count
= 0, i
;
4695 struct device
*dev
= ent
->dev
;
4696 struct ata_host_set
*host_set
;
4699 /* alloc a container for our list of ATA ports (buses) */
4700 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4701 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4704 spin_lock_init(&host_set
->lock
);
4706 host_set
->dev
= dev
;
4707 host_set
->n_ports
= ent
->n_ports
;
4708 host_set
->irq
= ent
->irq
;
4709 host_set
->mmio_base
= ent
->mmio_base
;
4710 host_set
->private_data
= ent
->private_data
;
4711 host_set
->ops
= ent
->port_ops
;
4712 host_set
->flags
= ent
->host_set_flags
;
4714 /* register each port bound to this device */
4715 for (i
= 0; i
< ent
->n_ports
; i
++) {
4716 struct ata_port
*ap
;
4717 unsigned long xfer_mode_mask
;
4719 ap
= ata_host_add(ent
, host_set
, i
);
4723 host_set
->ports
[i
] = ap
;
4724 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4725 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4726 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4728 /* print per-port info to dmesg */
4729 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4730 "bmdma 0x%lX irq %lu\n",
4732 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4733 ata_mode_string(xfer_mode_mask
),
4734 ap
->ioaddr
.cmd_addr
,
4735 ap
->ioaddr
.ctl_addr
,
4736 ap
->ioaddr
.bmdma_addr
,
4740 host_set
->ops
->irq_clear(ap
);
4747 /* obtain irq, that is shared between channels */
4748 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4749 DRV_NAME
, host_set
))
4752 /* perform each probe synchronously */
4753 DPRINTK("probe begin\n");
4754 for (i
= 0; i
< count
; i
++) {
4755 struct ata_port
*ap
;
4758 ap
= host_set
->ports
[i
];
4760 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4761 rc
= ata_bus_probe(ap
);
4762 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4765 /* FIXME: do something useful here?
4766 * Current libata behavior will
4767 * tear down everything when
4768 * the module is removed
4769 * or the h/w is unplugged.
4773 rc
= scsi_add_host(ap
->host
, dev
);
4775 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4777 /* FIXME: do something useful here */
4778 /* FIXME: handle unconditional calls to
4779 * scsi_scan_host and ata_host_remove, below,
4785 /* probes are done, now scan each port's disk(s) */
4786 DPRINTK("host probe begin\n");
4787 for (i
= 0; i
< count
; i
++) {
4788 struct ata_port
*ap
= host_set
->ports
[i
];
4790 ata_scsi_scan_host(ap
);
4793 dev_set_drvdata(dev
, host_set
);
4795 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4796 return ent
->n_ports
; /* success */
4799 for (i
= 0; i
< count
; i
++) {
4800 ata_host_remove(host_set
->ports
[i
], 1);
4801 scsi_host_put(host_set
->ports
[i
]->host
);
4805 VPRINTK("EXIT, returning 0\n");
4810 * ata_host_set_remove - PCI layer callback for device removal
4811 * @host_set: ATA host set that was removed
4813 * Unregister all objects associated with this host set. Free those
4817 * Inherited from calling layer (may sleep).
4820 void ata_host_set_remove(struct ata_host_set
*host_set
)
4822 struct ata_port
*ap
;
4825 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4826 ap
= host_set
->ports
[i
];
4827 scsi_remove_host(ap
->host
);
4830 free_irq(host_set
->irq
, host_set
);
4832 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4833 ap
= host_set
->ports
[i
];
4835 ata_scsi_release(ap
->host
);
4837 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4838 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4840 if (ioaddr
->cmd_addr
== 0x1f0)
4841 release_region(0x1f0, 8);
4842 else if (ioaddr
->cmd_addr
== 0x170)
4843 release_region(0x170, 8);
4846 scsi_host_put(ap
->host
);
4849 if (host_set
->ops
->host_stop
)
4850 host_set
->ops
->host_stop(host_set
);
4856 * ata_scsi_release - SCSI layer callback hook for host unload
4857 * @host: libata host to be unloaded
4859 * Performs all duties necessary to shut down a libata port...
4860 * Kill port kthread, disable port, and release resources.
4863 * Inherited from SCSI layer.
4869 int ata_scsi_release(struct Scsi_Host
*host
)
4871 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4876 ap
->ops
->port_disable(ap
);
4877 ata_host_remove(ap
, 0);
4878 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4879 kfree(ap
->device
[i
].id
);
4886 * ata_std_ports - initialize ioaddr with standard port offsets.
4887 * @ioaddr: IO address structure to be initialized
4889 * Utility function which initializes data_addr, error_addr,
4890 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4891 * device_addr, status_addr, and command_addr to standard offsets
4892 * relative to cmd_addr.
4894 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4897 void ata_std_ports(struct ata_ioports
*ioaddr
)
4899 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4900 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4901 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4902 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4903 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4904 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4905 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4906 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4907 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4908 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4914 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4916 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4918 pci_iounmap(pdev
, host_set
->mmio_base
);
4922 * ata_pci_remove_one - PCI layer callback for device removal
4923 * @pdev: PCI device that was removed
4925 * PCI layer indicates to libata via this hook that
4926 * hot-unplug or module unload event has occurred.
4927 * Handle this by unregistering all objects associated
4928 * with this PCI device. Free those objects. Then finally
4929 * release PCI resources and disable device.
4932 * Inherited from PCI layer (may sleep).
4935 void ata_pci_remove_one (struct pci_dev
*pdev
)
4937 struct device
*dev
= pci_dev_to_dev(pdev
);
4938 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4940 ata_host_set_remove(host_set
);
4941 pci_release_regions(pdev
);
4942 pci_disable_device(pdev
);
4943 dev_set_drvdata(dev
, NULL
);
4946 /* move to PCI subsystem */
4947 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4949 unsigned long tmp
= 0;
4951 switch (bits
->width
) {
4954 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4960 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4966 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4977 return (tmp
== bits
->val
) ? 1 : 0;
4980 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
4982 pci_save_state(pdev
);
4983 pci_disable_device(pdev
);
4984 pci_set_power_state(pdev
, PCI_D3hot
);
4988 int ata_pci_device_resume(struct pci_dev
*pdev
)
4990 pci_set_power_state(pdev
, PCI_D0
);
4991 pci_restore_state(pdev
);
4992 pci_enable_device(pdev
);
4993 pci_set_master(pdev
);
4996 #endif /* CONFIG_PCI */
4999 static int __init
ata_init(void)
5001 ata_wq
= create_workqueue("ata");
5005 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5009 static void __exit
ata_exit(void)
5011 destroy_workqueue(ata_wq
);
5014 module_init(ata_init
);
5015 module_exit(ata_exit
);
5017 static unsigned long ratelimit_time
;
5018 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5020 int ata_ratelimit(void)
5023 unsigned long flags
;
5025 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5027 if (time_after(jiffies
, ratelimit_time
)) {
5029 ratelimit_time
= jiffies
+ (HZ
/5);
5033 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5039 * libata is essentially a library of internal helper functions for
5040 * low-level ATA host controller drivers. As such, the API/ABI is
5041 * likely to change as new drivers are added and updated.
5042 * Do not depend on ABI/API stability.
5045 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5046 EXPORT_SYMBOL_GPL(ata_std_ports
);
5047 EXPORT_SYMBOL_GPL(ata_device_add
);
5048 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5049 EXPORT_SYMBOL_GPL(ata_sg_init
);
5050 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5051 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5052 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5053 EXPORT_SYMBOL_GPL(ata_tf_load
);
5054 EXPORT_SYMBOL_GPL(ata_tf_read
);
5055 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5056 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5057 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5058 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5059 EXPORT_SYMBOL_GPL(ata_check_status
);
5060 EXPORT_SYMBOL_GPL(ata_altstatus
);
5061 EXPORT_SYMBOL_GPL(ata_exec_command
);
5062 EXPORT_SYMBOL_GPL(ata_port_start
);
5063 EXPORT_SYMBOL_GPL(ata_port_stop
);
5064 EXPORT_SYMBOL_GPL(ata_host_stop
);
5065 EXPORT_SYMBOL_GPL(ata_interrupt
);
5066 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5067 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5068 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5069 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5070 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5071 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5072 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5073 EXPORT_SYMBOL_GPL(ata_port_probe
);
5074 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5075 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5076 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5077 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5078 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5079 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5080 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5081 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5082 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5083 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5084 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5085 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5086 EXPORT_SYMBOL_GPL(ata_port_disable
);
5087 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5088 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5089 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5090 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5091 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5092 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5093 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5094 EXPORT_SYMBOL_GPL(ata_host_intr
);
5095 EXPORT_SYMBOL_GPL(ata_id_string
);
5096 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5097 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5099 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5100 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5101 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5104 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5105 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5106 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5107 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5108 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5109 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5110 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5111 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5112 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5113 #endif /* CONFIG_PCI */
5115 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5116 EXPORT_SYMBOL_GPL(ata_device_resume
);
5117 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5118 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5120 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5121 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5122 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5123 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);