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 int ata_down_xfermask_limit(struct ata_port
*ap
, struct ata_device
*dev
,
70 static int ata_down_sata_spd_limit(struct ata_port
*ap
);
71 static int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
);
72 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
73 struct ata_device
*dev
);
74 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
);
76 static unsigned int ata_unique_id
= 1;
77 static struct workqueue_struct
*ata_wq
;
79 int atapi_enabled
= 1;
80 module_param(atapi_enabled
, int, 0444);
81 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
84 module_param_named(fua
, libata_fua
, int, 0444);
85 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
87 MODULE_AUTHOR("Jeff Garzik");
88 MODULE_DESCRIPTION("Library module for ATA devices");
89 MODULE_LICENSE("GPL");
90 MODULE_VERSION(DRV_VERSION
);
94 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
95 * @tf: Taskfile to convert
96 * @fis: Buffer into which data will output
97 * @pmp: Port multiplier port
99 * Converts a standard ATA taskfile to a Serial ATA
100 * FIS structure (Register - Host to Device).
103 * Inherited from caller.
106 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
108 fis
[0] = 0x27; /* Register - Host to Device FIS */
109 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
110 bit 7 indicates Command FIS */
111 fis
[2] = tf
->command
;
112 fis
[3] = tf
->feature
;
119 fis
[8] = tf
->hob_lbal
;
120 fis
[9] = tf
->hob_lbam
;
121 fis
[10] = tf
->hob_lbah
;
122 fis
[11] = tf
->hob_feature
;
125 fis
[13] = tf
->hob_nsect
;
136 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
137 * @fis: Buffer from which data will be input
138 * @tf: Taskfile to output
140 * Converts a serial ATA FIS structure to a standard ATA taskfile.
143 * Inherited from caller.
146 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
148 tf
->command
= fis
[2]; /* status */
149 tf
->feature
= fis
[3]; /* error */
156 tf
->hob_lbal
= fis
[8];
157 tf
->hob_lbam
= fis
[9];
158 tf
->hob_lbah
= fis
[10];
161 tf
->hob_nsect
= fis
[13];
164 static const u8 ata_rw_cmds
[] = {
168 ATA_CMD_READ_MULTI_EXT
,
169 ATA_CMD_WRITE_MULTI_EXT
,
173 ATA_CMD_WRITE_MULTI_FUA_EXT
,
177 ATA_CMD_PIO_READ_EXT
,
178 ATA_CMD_PIO_WRITE_EXT
,
191 ATA_CMD_WRITE_FUA_EXT
195 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
196 * @qc: command to examine and configure
198 * Examine the device configuration and tf->flags to calculate
199 * the proper read/write commands and protocol to use.
204 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
206 struct ata_taskfile
*tf
= &qc
->tf
;
207 struct ata_device
*dev
= qc
->dev
;
210 int index
, fua
, lba48
, write
;
212 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
213 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
214 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
216 if (dev
->flags
& ATA_DFLAG_PIO
) {
217 tf
->protocol
= ATA_PROT_PIO
;
218 index
= dev
->multi_count
? 0 : 8;
219 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
220 /* Unable to use DMA due to host limitation */
221 tf
->protocol
= ATA_PROT_PIO
;
222 index
= dev
->multi_count
? 0 : 8;
224 tf
->protocol
= ATA_PROT_DMA
;
228 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
237 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
238 * @pio_mask: pio_mask
239 * @mwdma_mask: mwdma_mask
240 * @udma_mask: udma_mask
242 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
243 * unsigned int xfer_mask.
251 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
252 unsigned int mwdma_mask
,
253 unsigned int udma_mask
)
255 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
256 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
257 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
261 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
262 * @xfer_mask: xfer_mask to unpack
263 * @pio_mask: resulting pio_mask
264 * @mwdma_mask: resulting mwdma_mask
265 * @udma_mask: resulting udma_mask
267 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
268 * Any NULL distination masks will be ignored.
270 static void ata_unpack_xfermask(unsigned int xfer_mask
,
271 unsigned int *pio_mask
,
272 unsigned int *mwdma_mask
,
273 unsigned int *udma_mask
)
276 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
278 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
280 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
283 static const struct ata_xfer_ent
{
287 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
288 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
289 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
294 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
295 * @xfer_mask: xfer_mask of interest
297 * Return matching XFER_* value for @xfer_mask. Only the highest
298 * bit of @xfer_mask is considered.
304 * Matching XFER_* value, 0 if no match found.
306 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
308 int highbit
= fls(xfer_mask
) - 1;
309 const struct ata_xfer_ent
*ent
;
311 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
312 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
313 return ent
->base
+ highbit
- ent
->shift
;
318 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
319 * @xfer_mode: XFER_* of interest
321 * Return matching xfer_mask for @xfer_mode.
327 * Matching xfer_mask, 0 if no match found.
329 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
331 const struct ata_xfer_ent
*ent
;
333 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
334 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
335 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
340 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
341 * @xfer_mode: XFER_* of interest
343 * Return matching xfer_shift for @xfer_mode.
349 * Matching xfer_shift, -1 if no match found.
351 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
353 const struct ata_xfer_ent
*ent
;
355 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
356 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
362 * ata_mode_string - convert xfer_mask to string
363 * @xfer_mask: mask of bits supported; only highest bit counts.
365 * Determine string which represents the highest speed
366 * (highest bit in @modemask).
372 * Constant C string representing highest speed listed in
373 * @mode_mask, or the constant C string "<n/a>".
375 static const char *ata_mode_string(unsigned int xfer_mask
)
377 static const char * const xfer_mode_str
[] = {
397 highbit
= fls(xfer_mask
) - 1;
398 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
399 return xfer_mode_str
[highbit
];
403 static const char *sata_spd_string(unsigned int spd
)
405 static const char * const spd_str
[] = {
410 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
412 return spd_str
[spd
- 1];
415 static void ata_dev_disable(struct ata_port
*ap
, struct ata_device
*dev
)
417 if (ata_dev_enabled(dev
)) {
418 printk(KERN_WARNING
"ata%u: dev %u disabled\n",
425 * ata_pio_devchk - PATA device presence detection
426 * @ap: ATA channel to examine
427 * @device: Device to examine (starting at zero)
429 * This technique was originally described in
430 * Hale Landis's ATADRVR (www.ata-atapi.com), and
431 * later found its way into the ATA/ATAPI spec.
433 * Write a pattern to the ATA shadow registers,
434 * and if a device is present, it will respond by
435 * correctly storing and echoing back the
436 * ATA shadow register contents.
442 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
445 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
448 ap
->ops
->dev_select(ap
, device
);
450 outb(0x55, ioaddr
->nsect_addr
);
451 outb(0xaa, ioaddr
->lbal_addr
);
453 outb(0xaa, ioaddr
->nsect_addr
);
454 outb(0x55, ioaddr
->lbal_addr
);
456 outb(0x55, ioaddr
->nsect_addr
);
457 outb(0xaa, ioaddr
->lbal_addr
);
459 nsect
= inb(ioaddr
->nsect_addr
);
460 lbal
= inb(ioaddr
->lbal_addr
);
462 if ((nsect
== 0x55) && (lbal
== 0xaa))
463 return 1; /* we found a device */
465 return 0; /* nothing found */
469 * ata_mmio_devchk - PATA device presence detection
470 * @ap: ATA channel to examine
471 * @device: Device to examine (starting at zero)
473 * This technique was originally described in
474 * Hale Landis's ATADRVR (www.ata-atapi.com), and
475 * later found its way into the ATA/ATAPI spec.
477 * Write a pattern to the ATA shadow registers,
478 * and if a device is present, it will respond by
479 * correctly storing and echoing back the
480 * ATA shadow register contents.
486 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
489 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
492 ap
->ops
->dev_select(ap
, device
);
494 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
495 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
497 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
498 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
500 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
501 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
503 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
504 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
506 if ((nsect
== 0x55) && (lbal
== 0xaa))
507 return 1; /* we found a device */
509 return 0; /* nothing found */
513 * ata_devchk - PATA device presence detection
514 * @ap: ATA channel to examine
515 * @device: Device to examine (starting at zero)
517 * Dispatch ATA device presence detection, depending
518 * on whether we are using PIO or MMIO to talk to the
519 * ATA shadow registers.
525 static unsigned int ata_devchk(struct ata_port
*ap
,
528 if (ap
->flags
& ATA_FLAG_MMIO
)
529 return ata_mmio_devchk(ap
, device
);
530 return ata_pio_devchk(ap
, device
);
534 * ata_dev_classify - determine device type based on ATA-spec signature
535 * @tf: ATA taskfile register set for device to be identified
537 * Determine from taskfile register contents whether a device is
538 * ATA or ATAPI, as per "Signature and persistence" section
539 * of ATA/PI spec (volume 1, sect 5.14).
545 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
546 * the event of failure.
549 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
551 /* Apple's open source Darwin code hints that some devices only
552 * put a proper signature into the LBA mid/high registers,
553 * So, we only check those. It's sufficient for uniqueness.
556 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
557 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
558 DPRINTK("found ATA device by sig\n");
562 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
563 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
564 DPRINTK("found ATAPI device by sig\n");
565 return ATA_DEV_ATAPI
;
568 DPRINTK("unknown device\n");
569 return ATA_DEV_UNKNOWN
;
573 * ata_dev_try_classify - Parse returned ATA device signature
574 * @ap: ATA channel to examine
575 * @device: Device to examine (starting at zero)
576 * @r_err: Value of error register on completion
578 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
579 * an ATA/ATAPI-defined set of values is placed in the ATA
580 * shadow registers, indicating the results of device detection
583 * Select the ATA device, and read the values from the ATA shadow
584 * registers. Then parse according to the Error register value,
585 * and the spec-defined values examined by ata_dev_classify().
591 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
595 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
597 struct ata_taskfile tf
;
601 ap
->ops
->dev_select(ap
, device
);
603 memset(&tf
, 0, sizeof(tf
));
605 ap
->ops
->tf_read(ap
, &tf
);
610 /* see if device passed diags */
613 else if ((device
== 0) && (err
== 0x81))
618 /* determine if device is ATA or ATAPI */
619 class = ata_dev_classify(&tf
);
621 if (class == ATA_DEV_UNKNOWN
)
623 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
629 * ata_id_string - Convert IDENTIFY DEVICE page into string
630 * @id: IDENTIFY DEVICE results we will examine
631 * @s: string into which data is output
632 * @ofs: offset into identify device page
633 * @len: length of string to return. must be an even number.
635 * The strings in the IDENTIFY DEVICE page are broken up into
636 * 16-bit chunks. Run through the string, and output each
637 * 8-bit chunk linearly, regardless of platform.
643 void ata_id_string(const u16
*id
, unsigned char *s
,
644 unsigned int ofs
, unsigned int len
)
663 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
664 * @id: IDENTIFY DEVICE results we will examine
665 * @s: string into which data is output
666 * @ofs: offset into identify device page
667 * @len: length of string to return. must be an odd number.
669 * This function is identical to ata_id_string except that it
670 * trims trailing spaces and terminates the resulting string with
671 * null. @len must be actual maximum length (even number) + 1.
676 void ata_id_c_string(const u16
*id
, unsigned char *s
,
677 unsigned int ofs
, unsigned int len
)
683 ata_id_string(id
, s
, ofs
, len
- 1);
685 p
= s
+ strnlen(s
, len
- 1);
686 while (p
> s
&& p
[-1] == ' ')
691 static u64
ata_id_n_sectors(const u16
*id
)
693 if (ata_id_has_lba(id
)) {
694 if (ata_id_has_lba48(id
))
695 return ata_id_u64(id
, 100);
697 return ata_id_u32(id
, 60);
699 if (ata_id_current_chs_valid(id
))
700 return ata_id_u32(id
, 57);
702 return id
[1] * id
[3] * id
[6];
707 * ata_noop_dev_select - Select device 0/1 on ATA bus
708 * @ap: ATA channel to manipulate
709 * @device: ATA device (numbered from zero) to select
711 * This function performs no actual function.
713 * May be used as the dev_select() entry in ata_port_operations.
718 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
724 * ata_std_dev_select - Select device 0/1 on ATA bus
725 * @ap: ATA channel to manipulate
726 * @device: ATA device (numbered from zero) to select
728 * Use the method defined in the ATA specification to
729 * make either device 0, or device 1, active on the
730 * ATA channel. Works with both PIO and MMIO.
732 * May be used as the dev_select() entry in ata_port_operations.
738 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
743 tmp
= ATA_DEVICE_OBS
;
745 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
747 if (ap
->flags
& ATA_FLAG_MMIO
) {
748 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
750 outb(tmp
, ap
->ioaddr
.device_addr
);
752 ata_pause(ap
); /* needed; also flushes, for mmio */
756 * ata_dev_select - Select device 0/1 on ATA bus
757 * @ap: ATA channel to manipulate
758 * @device: ATA device (numbered from zero) to select
759 * @wait: non-zero to wait for Status register BSY bit to clear
760 * @can_sleep: non-zero if context allows sleeping
762 * Use the method defined in the ATA specification to
763 * make either device 0, or device 1, active on the
766 * This is a high-level version of ata_std_dev_select(),
767 * which additionally provides the services of inserting
768 * the proper pauses and status polling, where needed.
774 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
775 unsigned int wait
, unsigned int can_sleep
)
777 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
778 ap
->id
, device
, wait
);
783 ap
->ops
->dev_select(ap
, device
);
786 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
793 * ata_dump_id - IDENTIFY DEVICE info debugging output
794 * @id: IDENTIFY DEVICE page to dump
796 * Dump selected 16-bit words from the given IDENTIFY DEVICE
803 static inline void ata_dump_id(const u16
*id
)
805 DPRINTK("49==0x%04x "
815 DPRINTK("80==0x%04x "
825 DPRINTK("88==0x%04x "
832 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
833 * @id: IDENTIFY data to compute xfer mask from
835 * Compute the xfermask for this device. This is not as trivial
836 * as it seems if we must consider early devices correctly.
838 * FIXME: pre IDE drive timing (do we care ?).
846 static unsigned int ata_id_xfermask(const u16
*id
)
848 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
850 /* Usual case. Word 53 indicates word 64 is valid */
851 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
852 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
856 /* If word 64 isn't valid then Word 51 high byte holds
857 * the PIO timing number for the maximum. Turn it into
860 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
862 /* But wait.. there's more. Design your standards by
863 * committee and you too can get a free iordy field to
864 * process. However its the speeds not the modes that
865 * are supported... Note drivers using the timing API
866 * will get this right anyway
870 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
873 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
874 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
876 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
880 * ata_port_queue_task - Queue port_task
881 * @ap: The ata_port to queue port_task for
883 * Schedule @fn(@data) for execution after @delay jiffies using
884 * port_task. There is one port_task per port and it's the
885 * user(low level driver)'s responsibility to make sure that only
886 * one task is active at any given time.
888 * libata core layer takes care of synchronization between
889 * port_task and EH. ata_port_queue_task() may be ignored for EH
893 * Inherited from caller.
895 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
900 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
903 PREPARE_WORK(&ap
->port_task
, fn
, data
);
906 rc
= queue_work(ata_wq
, &ap
->port_task
);
908 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
910 /* rc == 0 means that another user is using port task */
915 * ata_port_flush_task - Flush port_task
916 * @ap: The ata_port to flush port_task for
918 * After this function completes, port_task is guranteed not to
919 * be running or scheduled.
922 * Kernel thread context (may sleep)
924 void ata_port_flush_task(struct ata_port
*ap
)
930 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
931 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
932 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
934 DPRINTK("flush #1\n");
935 flush_workqueue(ata_wq
);
938 * At this point, if a task is running, it's guaranteed to see
939 * the FLUSH flag; thus, it will never queue pio tasks again.
942 if (!cancel_delayed_work(&ap
->port_task
)) {
943 DPRINTK("flush #2\n");
944 flush_workqueue(ata_wq
);
947 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
948 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
949 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
954 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
956 struct completion
*waiting
= qc
->private_data
;
958 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
963 * ata_exec_internal - execute libata internal command
964 * @ap: Port to which the command is sent
965 * @dev: Device to which the command is sent
966 * @tf: Taskfile registers for the command and the result
967 * @dma_dir: Data tranfer direction of the command
968 * @buf: Data buffer of the command
969 * @buflen: Length of data buffer
971 * Executes libata internal command with timeout. @tf contains
972 * command on entry and result on return. Timeout and error
973 * conditions are reported via return value. No recovery action
974 * is taken after a command times out. It's caller's duty to
975 * clean up after timeout.
978 * None. Should be called with kernel context, might sleep.
982 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
983 struct ata_taskfile
*tf
,
984 int dma_dir
, void *buf
, unsigned int buflen
)
986 u8 command
= tf
->command
;
987 struct ata_queued_cmd
*qc
;
988 DECLARE_COMPLETION(wait
);
990 unsigned int err_mask
;
992 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
994 qc
= ata_qc_new_init(ap
, dev
);
998 qc
->dma_dir
= dma_dir
;
999 if (dma_dir
!= DMA_NONE
) {
1000 ata_sg_init_one(qc
, buf
, buflen
);
1001 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1004 qc
->private_data
= &wait
;
1005 qc
->complete_fn
= ata_qc_complete_internal
;
1009 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1011 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1012 ata_port_flush_task(ap
);
1014 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1016 /* We're racing with irq here. If we lose, the
1017 * following test prevents us from completing the qc
1018 * again. If completion irq occurs after here but
1019 * before the caller cleans up, it will result in a
1020 * spurious interrupt. We can live with that.
1022 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1023 qc
->err_mask
= AC_ERR_TIMEOUT
;
1024 ata_qc_complete(qc
);
1025 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1029 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1033 err_mask
= qc
->err_mask
;
1037 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1038 * Until those drivers are fixed, we detect the condition
1039 * here, fail the command with AC_ERR_SYSTEM and reenable the
1042 * Note that this doesn't change any behavior as internal
1043 * command failure results in disabling the device in the
1044 * higher layer for LLDDs without new reset/EH callbacks.
1046 * Kill the following code as soon as those drivers are fixed.
1048 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
) {
1049 err_mask
|= AC_ERR_SYSTEM
;
1057 * ata_pio_need_iordy - check if iordy needed
1060 * Check if the current speed of the device requires IORDY. Used
1061 * by various controllers for chip configuration.
1064 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1067 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1074 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1076 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1077 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1078 /* Is the speed faster than the drive allows non IORDY ? */
1080 /* This is cycle times not frequency - watch the logic! */
1081 if (pio
> 240) /* PIO2 is 240nS per cycle */
1090 * ata_dev_read_id - Read ID data from the specified device
1091 * @ap: port on which target device resides
1092 * @dev: target device
1093 * @p_class: pointer to class of the target device (may be changed)
1094 * @post_reset: is this read ID post-reset?
1095 * @p_id: read IDENTIFY page (newly allocated)
1097 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1098 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1099 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1100 * for pre-ATA4 drives.
1103 * Kernel thread context (may sleep)
1106 * 0 on success, -errno otherwise.
1108 static int ata_dev_read_id(struct ata_port
*ap
, struct ata_device
*dev
,
1109 unsigned int *p_class
, int post_reset
, u16
**p_id
)
1111 unsigned int class = *p_class
;
1112 struct ata_taskfile tf
;
1113 unsigned int err_mask
= 0;
1118 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1120 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1122 id
= kmalloc(sizeof(id
[0]) * ATA_ID_WORDS
, GFP_KERNEL
);
1125 reason
= "out of memory";
1130 ata_tf_init(ap
, &tf
, dev
->devno
);
1134 tf
.command
= ATA_CMD_ID_ATA
;
1137 tf
.command
= ATA_CMD_ID_ATAPI
;
1141 reason
= "unsupported class";
1145 tf
.protocol
= ATA_PROT_PIO
;
1147 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1148 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1151 reason
= "I/O error";
1155 swap_buf_le16(id
, ATA_ID_WORDS
);
1158 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1160 reason
= "device reports illegal type";
1164 if (post_reset
&& class == ATA_DEV_ATA
) {
1166 * The exact sequence expected by certain pre-ATA4 drives is:
1169 * INITIALIZE DEVICE PARAMETERS
1171 * Some drives were very specific about that exact sequence.
1173 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1174 err_mask
= ata_dev_init_params(ap
, dev
, id
[3], id
[6]);
1177 reason
= "INIT_DEV_PARAMS failed";
1181 /* current CHS translation info (id[53-58]) might be
1182 * changed. reread the identify device info.
1194 printk(KERN_WARNING
"ata%u: dev %u failed to IDENTIFY (%s)\n",
1195 ap
->id
, dev
->devno
, reason
);
1200 static inline u8
ata_dev_knobble(const struct ata_port
*ap
,
1201 struct ata_device
*dev
)
1203 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1207 * ata_dev_configure - Configure the specified ATA/ATAPI device
1208 * @ap: Port on which target device resides
1209 * @dev: Target device to configure
1210 * @print_info: Enable device info printout
1212 * Configure @dev according to @dev->id. Generic and low-level
1213 * driver specific fixups are also applied.
1216 * Kernel thread context (may sleep)
1219 * 0 on success, -errno otherwise
1221 static int ata_dev_configure(struct ata_port
*ap
, struct ata_device
*dev
,
1224 const u16
*id
= dev
->id
;
1225 unsigned int xfer_mask
;
1228 if (!ata_dev_enabled(dev
)) {
1229 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1230 ap
->id
, dev
->devno
);
1234 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1236 /* print device capabilities */
1238 printk(KERN_DEBUG
"ata%u: dev %u cfg 49:%04x 82:%04x 83:%04x "
1239 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1240 ap
->id
, dev
->devno
, id
[49], id
[82], id
[83],
1241 id
[84], id
[85], id
[86], id
[87], id
[88]);
1243 /* initialize to-be-configured parameters */
1245 dev
->max_sectors
= 0;
1253 * common ATA, ATAPI feature tests
1256 /* find max transfer mode; for printk only */
1257 xfer_mask
= ata_id_xfermask(id
);
1261 /* ATA-specific feature tests */
1262 if (dev
->class == ATA_DEV_ATA
) {
1263 dev
->n_sectors
= ata_id_n_sectors(id
);
1265 if (ata_id_has_lba(id
)) {
1266 const char *lba_desc
;
1269 dev
->flags
|= ATA_DFLAG_LBA
;
1270 if (ata_id_has_lba48(id
)) {
1271 dev
->flags
|= ATA_DFLAG_LBA48
;
1275 /* print device info to dmesg */
1277 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1278 "max %s, %Lu sectors: %s\n",
1280 ata_id_major_version(id
),
1281 ata_mode_string(xfer_mask
),
1282 (unsigned long long)dev
->n_sectors
,
1287 /* Default translation */
1288 dev
->cylinders
= id
[1];
1290 dev
->sectors
= id
[6];
1292 if (ata_id_current_chs_valid(id
)) {
1293 /* Current CHS translation is valid. */
1294 dev
->cylinders
= id
[54];
1295 dev
->heads
= id
[55];
1296 dev
->sectors
= id
[56];
1299 /* print device info to dmesg */
1301 printk(KERN_INFO
"ata%u: dev %u ATA-%d, "
1302 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1304 ata_id_major_version(id
),
1305 ata_mode_string(xfer_mask
),
1306 (unsigned long long)dev
->n_sectors
,
1307 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1313 /* ATAPI-specific feature tests */
1314 else if (dev
->class == ATA_DEV_ATAPI
) {
1315 rc
= atapi_cdb_len(id
);
1316 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1317 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1321 dev
->cdb_len
= (unsigned int) rc
;
1323 /* print device info to dmesg */
1325 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1326 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1329 ap
->host
->max_cmd_len
= 0;
1330 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1331 ap
->host
->max_cmd_len
= max_t(unsigned int,
1332 ap
->host
->max_cmd_len
,
1333 ap
->device
[i
].cdb_len
);
1335 /* limit bridge transfers to udma5, 200 sectors */
1336 if (ata_dev_knobble(ap
, dev
)) {
1338 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1339 ap
->id
, dev
->devno
);
1340 dev
->udma_mask
&= ATA_UDMA5
;
1341 dev
->max_sectors
= ATA_MAX_SECTORS
;
1344 if (ap
->ops
->dev_config
)
1345 ap
->ops
->dev_config(ap
, dev
);
1347 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1351 DPRINTK("EXIT, err\n");
1356 * ata_bus_probe - Reset and probe ATA bus
1359 * Master ATA bus probing function. Initiates a hardware-dependent
1360 * bus reset, then attempts to identify any devices found on
1364 * PCI/etc. bus probe sem.
1367 * Zero on success, negative errno otherwise.
1370 static int ata_bus_probe(struct ata_port
*ap
)
1372 unsigned int classes
[ATA_MAX_DEVICES
];
1373 int tries
[ATA_MAX_DEVICES
];
1374 int i
, rc
, down_xfermask
;
1375 struct ata_device
*dev
;
1379 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1380 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1385 /* reset and determine device classes */
1386 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1387 classes
[i
] = ATA_DEV_UNKNOWN
;
1389 if (ap
->ops
->probe_reset
) {
1390 rc
= ap
->ops
->probe_reset(ap
, classes
);
1392 printk("ata%u: reset failed (errno=%d)\n", ap
->id
, rc
);
1396 ap
->ops
->phy_reset(ap
);
1398 if (!(ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1399 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1400 classes
[i
] = ap
->device
[i
].class;
1405 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1406 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1407 classes
[i
] = ATA_DEV_NONE
;
1409 /* read IDENTIFY page and configure devices */
1410 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1411 dev
= &ap
->device
[i
];
1412 dev
->class = classes
[i
];
1415 ata_down_xfermask_limit(ap
, dev
, 1);
1416 ata_dev_disable(ap
, dev
);
1419 if (!ata_dev_enabled(dev
))
1424 rc
= ata_dev_read_id(ap
, dev
, &dev
->class, 1, &dev
->id
);
1428 rc
= ata_dev_configure(ap
, dev
, 1);
1433 /* configure transfer mode */
1434 if (ap
->ops
->set_mode
) {
1435 /* FIXME: make ->set_mode handle no device case and
1436 * return error code and failing device on failure as
1437 * ata_set_mode() does.
1439 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1440 if (ata_dev_enabled(&ap
->device
[i
])) {
1441 ap
->ops
->set_mode(ap
);
1446 rc
= ata_set_mode(ap
, &dev
);
1453 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1454 if (ata_dev_enabled(&ap
->device
[i
]))
1457 /* no device present, disable port */
1458 ata_port_disable(ap
);
1459 ap
->ops
->port_disable(ap
);
1466 tries
[dev
->devno
] = 0;
1469 ata_down_sata_spd_limit(ap
);
1472 tries
[dev
->devno
]--;
1473 if (down_xfermask
&&
1474 ata_down_xfermask_limit(ap
, dev
, tries
[dev
->devno
] == 1))
1475 tries
[dev
->devno
] = 0;
1482 * ata_port_probe - Mark port as enabled
1483 * @ap: Port for which we indicate enablement
1485 * Modify @ap data structure such that the system
1486 * thinks that the entire port is enabled.
1488 * LOCKING: host_set lock, or some other form of
1492 void ata_port_probe(struct ata_port
*ap
)
1494 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1498 * sata_print_link_status - Print SATA link status
1499 * @ap: SATA port to printk link status about
1501 * This function prints link speed and status of a SATA link.
1506 static void sata_print_link_status(struct ata_port
*ap
)
1510 if (!ap
->ops
->scr_read
)
1513 sstatus
= scr_read(ap
, SCR_STATUS
);
1515 if (sata_dev_present(ap
)) {
1516 tmp
= (sstatus
>> 4) & 0xf;
1517 printk(KERN_INFO
"ata%u: SATA link up %s (SStatus %X)\n",
1518 ap
->id
, sata_spd_string(tmp
), sstatus
);
1520 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1526 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1527 * @ap: SATA port associated with target SATA PHY.
1529 * This function issues commands to standard SATA Sxxx
1530 * PHY registers, to wake up the phy (and device), and
1531 * clear any reset condition.
1534 * PCI/etc. bus probe sem.
1537 void __sata_phy_reset(struct ata_port
*ap
)
1540 unsigned long timeout
= jiffies
+ (HZ
* 5);
1542 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1543 /* issue phy wake/reset */
1544 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1545 /* Couldn't find anything in SATA I/II specs, but
1546 * AHCI-1.1 10.4.2 says at least 1 ms. */
1549 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1551 /* wait for phy to become ready, if necessary */
1554 sstatus
= scr_read(ap
, SCR_STATUS
);
1555 if ((sstatus
& 0xf) != 1)
1557 } while (time_before(jiffies
, timeout
));
1559 /* print link status */
1560 sata_print_link_status(ap
);
1562 /* TODO: phy layer with polling, timeouts, etc. */
1563 if (sata_dev_present(ap
))
1566 ata_port_disable(ap
);
1568 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1571 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1572 ata_port_disable(ap
);
1576 ap
->cbl
= ATA_CBL_SATA
;
1580 * sata_phy_reset - Reset SATA bus.
1581 * @ap: SATA port associated with target SATA PHY.
1583 * This function resets the SATA bus, and then probes
1584 * the bus for devices.
1587 * PCI/etc. bus probe sem.
1590 void sata_phy_reset(struct ata_port
*ap
)
1592 __sata_phy_reset(ap
);
1593 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1599 * ata_dev_pair - return other device on cable
1603 * Obtain the other device on the same cable, or if none is
1604 * present NULL is returned
1607 struct ata_device
*ata_dev_pair(struct ata_port
*ap
, struct ata_device
*adev
)
1609 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1610 if (!ata_dev_enabled(pair
))
1616 * ata_port_disable - Disable port.
1617 * @ap: Port to be disabled.
1619 * Modify @ap data structure such that the system
1620 * thinks that the entire port is disabled, and should
1621 * never attempt to probe or communicate with devices
1624 * LOCKING: host_set lock, or some other form of
1628 void ata_port_disable(struct ata_port
*ap
)
1630 ap
->device
[0].class = ATA_DEV_NONE
;
1631 ap
->device
[1].class = ATA_DEV_NONE
;
1632 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1636 * ata_down_sata_spd_limit - adjust SATA spd limit downward
1637 * @ap: Port to adjust SATA spd limit for
1639 * Adjust SATA spd limit of @ap downward. Note that this
1640 * function only adjusts the limit. The change must be applied
1641 * using ata_set_sata_spd().
1644 * Inherited from caller.
1647 * 0 on success, negative errno on failure
1649 static int ata_down_sata_spd_limit(struct ata_port
*ap
)
1654 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1657 mask
= ap
->sata_spd_limit
;
1660 highbit
= fls(mask
) - 1;
1661 mask
&= ~(1 << highbit
);
1663 spd
= (scr_read(ap
, SCR_STATUS
) >> 4) & 0xf;
1667 mask
&= (1 << spd
) - 1;
1671 ap
->sata_spd_limit
= mask
;
1673 printk(KERN_WARNING
"ata%u: limiting SATA link speed to %s\n",
1674 ap
->id
, sata_spd_string(fls(mask
)));
1679 static int __ata_set_sata_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1683 if (ap
->sata_spd_limit
== UINT_MAX
)
1686 limit
= fls(ap
->sata_spd_limit
);
1688 spd
= (*scontrol
>> 4) & 0xf;
1689 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1691 return spd
!= limit
;
1695 * ata_set_sata_spd_needed - is SATA spd configuration needed
1696 * @ap: Port in question
1698 * Test whether the spd limit in SControl matches
1699 * @ap->sata_spd_limit. This function is used to determine
1700 * whether hardreset is necessary to apply SATA spd
1704 * Inherited from caller.
1707 * 1 if SATA spd configuration is needed, 0 otherwise.
1709 static int ata_set_sata_spd_needed(struct ata_port
*ap
)
1713 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1716 scontrol
= scr_read(ap
, SCR_CONTROL
);
1718 return __ata_set_sata_spd_needed(ap
, &scontrol
);
1722 * ata_set_sata_spd - set SATA spd according to spd limit
1723 * @ap: Port to set SATA spd for
1725 * Set SATA spd of @ap according to sata_spd_limit.
1728 * Inherited from caller.
1731 * 0 if spd doesn't need to be changed, 1 if spd has been
1732 * changed. -EOPNOTSUPP if SCR registers are inaccessible.
1734 static int ata_set_sata_spd(struct ata_port
*ap
)
1738 if (ap
->cbl
!= ATA_CBL_SATA
|| !ap
->ops
->scr_read
)
1741 scontrol
= scr_read(ap
, SCR_CONTROL
);
1742 if (!__ata_set_sata_spd_needed(ap
, &scontrol
))
1745 scr_write(ap
, SCR_CONTROL
, scontrol
);
1750 * This mode timing computation functionality is ported over from
1751 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1754 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1755 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1756 * for PIO 5, which is a nonstandard extension and UDMA6, which
1757 * is currently supported only by Maxtor drives.
1760 static const struct ata_timing ata_timing
[] = {
1762 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1763 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1764 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1765 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1767 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1768 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1769 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1771 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1773 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1774 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1775 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1777 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1778 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1779 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1781 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1782 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1783 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1785 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1786 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1787 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1789 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1794 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1795 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1797 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1799 q
->setup
= EZ(t
->setup
* 1000, T
);
1800 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1801 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1802 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1803 q
->active
= EZ(t
->active
* 1000, T
);
1804 q
->recover
= EZ(t
->recover
* 1000, T
);
1805 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1806 q
->udma
= EZ(t
->udma
* 1000, UT
);
1809 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1810 struct ata_timing
*m
, unsigned int what
)
1812 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1813 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1814 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1815 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1816 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1817 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1818 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1819 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1822 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1824 const struct ata_timing
*t
;
1826 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1827 if (t
->mode
== 0xFF)
1832 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1833 struct ata_timing
*t
, int T
, int UT
)
1835 const struct ata_timing
*s
;
1836 struct ata_timing p
;
1842 if (!(s
= ata_timing_find_mode(speed
)))
1845 memcpy(t
, s
, sizeof(*s
));
1848 * If the drive is an EIDE drive, it can tell us it needs extended
1849 * PIO/MW_DMA cycle timing.
1852 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1853 memset(&p
, 0, sizeof(p
));
1854 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1855 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1856 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1857 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1858 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1860 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1864 * Convert the timing to bus clock counts.
1867 ata_timing_quantize(t
, t
, T
, UT
);
1870 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1871 * S.M.A.R.T * and some other commands. We have to ensure that the
1872 * DMA cycle timing is slower/equal than the fastest PIO timing.
1875 if (speed
> XFER_PIO_4
) {
1876 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1877 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1881 * Lengthen active & recovery time so that cycle time is correct.
1884 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1885 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1886 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1889 if (t
->active
+ t
->recover
< t
->cycle
) {
1890 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1891 t
->recover
= t
->cycle
- t
->active
;
1898 * ata_down_xfermask_limit - adjust dev xfer masks downward
1899 * @ap: Port associated with device @dev
1900 * @dev: Device to adjust xfer masks
1901 * @force_pio0: Force PIO0
1903 * Adjust xfer masks of @dev downward. Note that this function
1904 * does not apply the change. Invoking ata_set_mode() afterwards
1905 * will apply the limit.
1908 * Inherited from caller.
1911 * 0 on success, negative errno on failure
1913 static int ata_down_xfermask_limit(struct ata_port
*ap
, struct ata_device
*dev
,
1916 unsigned long xfer_mask
;
1919 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
1924 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1925 if (xfer_mask
& ATA_MASK_UDMA
)
1926 xfer_mask
&= ~ATA_MASK_MWDMA
;
1928 highbit
= fls(xfer_mask
) - 1;
1929 xfer_mask
&= ~(1 << highbit
);
1931 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
1935 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
1938 printk(KERN_WARNING
"ata%u: dev %u limiting speed to %s\n",
1939 ap
->id
, dev
->devno
, ata_mode_string(xfer_mask
));
1947 static int ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1949 unsigned int err_mask
;
1952 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1953 dev
->flags
|= ATA_DFLAG_PIO
;
1955 err_mask
= ata_dev_set_xfermode(ap
, dev
);
1958 "ata%u: failed to set xfermode (err_mask=0x%x)\n",
1963 rc
= ata_dev_revalidate(ap
, dev
, 0);
1966 "ata%u: failed to revalidate after set xfermode\n",
1971 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1972 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1974 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1976 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1981 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1982 * @ap: port on which timings will be programmed
1983 * @r_failed_dev: out paramter for failed device
1985 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1986 * ata_set_mode() fails, pointer to the failing device is
1987 * returned in @r_failed_dev.
1990 * PCI/etc. bus probe sem.
1993 * 0 on success, negative errno otherwise
1995 static int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
1997 struct ata_device
*dev
;
1998 int i
, rc
= 0, used_dma
= 0, found
= 0;
2000 /* step 1: calculate xfer_mask */
2001 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2002 unsigned int pio_mask
, dma_mask
;
2004 dev
= &ap
->device
[i
];
2006 if (!ata_dev_enabled(dev
))
2009 ata_dev_xfermask(ap
, dev
);
2011 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2012 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2013 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2014 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2023 /* step 2: always set host PIO timings */
2024 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2025 dev
= &ap
->device
[i
];
2026 if (!ata_dev_enabled(dev
))
2029 if (!dev
->pio_mode
) {
2030 printk(KERN_WARNING
"ata%u: dev %u no PIO support\n",
2031 ap
->id
, dev
->devno
);
2036 dev
->xfer_mode
= dev
->pio_mode
;
2037 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2038 if (ap
->ops
->set_piomode
)
2039 ap
->ops
->set_piomode(ap
, dev
);
2042 /* step 3: set host DMA timings */
2043 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2044 dev
= &ap
->device
[i
];
2046 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2049 dev
->xfer_mode
= dev
->dma_mode
;
2050 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2051 if (ap
->ops
->set_dmamode
)
2052 ap
->ops
->set_dmamode(ap
, dev
);
2055 /* step 4: update devices' xfer mode */
2056 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2057 dev
= &ap
->device
[i
];
2059 if (!ata_dev_enabled(dev
))
2062 rc
= ata_dev_set_mode(ap
, dev
);
2067 /* Record simplex status. If we selected DMA then the other
2068 * host channels are not permitted to do so.
2070 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2071 ap
->host_set
->simplex_claimed
= 1;
2073 /* step5: chip specific finalisation */
2074 if (ap
->ops
->post_set_mode
)
2075 ap
->ops
->post_set_mode(ap
);
2079 *r_failed_dev
= dev
;
2084 * ata_tf_to_host - issue ATA taskfile to host controller
2085 * @ap: port to which command is being issued
2086 * @tf: ATA taskfile register set
2088 * Issues ATA taskfile register set to ATA host controller,
2089 * with proper synchronization with interrupt handler and
2093 * spin_lock_irqsave(host_set lock)
2096 static inline void ata_tf_to_host(struct ata_port
*ap
,
2097 const struct ata_taskfile
*tf
)
2099 ap
->ops
->tf_load(ap
, tf
);
2100 ap
->ops
->exec_command(ap
, tf
);
2104 * ata_busy_sleep - sleep until BSY clears, or timeout
2105 * @ap: port containing status register to be polled
2106 * @tmout_pat: impatience timeout
2107 * @tmout: overall timeout
2109 * Sleep until ATA Status register bit BSY clears,
2110 * or a timeout occurs.
2115 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2116 unsigned long tmout_pat
, unsigned long tmout
)
2118 unsigned long timer_start
, timeout
;
2121 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2122 timer_start
= jiffies
;
2123 timeout
= timer_start
+ tmout_pat
;
2124 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2126 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2129 if (status
& ATA_BUSY
)
2130 printk(KERN_WARNING
"ata%u is slow to respond, "
2131 "please be patient\n", ap
->id
);
2133 timeout
= timer_start
+ tmout
;
2134 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2136 status
= ata_chk_status(ap
);
2139 if (status
& ATA_BUSY
) {
2140 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
2141 ap
->id
, tmout
/ HZ
);
2148 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2150 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2151 unsigned int dev0
= devmask
& (1 << 0);
2152 unsigned int dev1
= devmask
& (1 << 1);
2153 unsigned long timeout
;
2155 /* if device 0 was found in ata_devchk, wait for its
2159 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2161 /* if device 1 was found in ata_devchk, wait for
2162 * register access, then wait for BSY to clear
2164 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2168 ap
->ops
->dev_select(ap
, 1);
2169 if (ap
->flags
& ATA_FLAG_MMIO
) {
2170 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2171 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2173 nsect
= inb(ioaddr
->nsect_addr
);
2174 lbal
= inb(ioaddr
->lbal_addr
);
2176 if ((nsect
== 1) && (lbal
== 1))
2178 if (time_after(jiffies
, timeout
)) {
2182 msleep(50); /* give drive a breather */
2185 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2187 /* is all this really necessary? */
2188 ap
->ops
->dev_select(ap
, 0);
2190 ap
->ops
->dev_select(ap
, 1);
2192 ap
->ops
->dev_select(ap
, 0);
2195 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2196 unsigned int devmask
)
2198 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2200 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2202 /* software reset. causes dev0 to be selected */
2203 if (ap
->flags
& ATA_FLAG_MMIO
) {
2204 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2205 udelay(20); /* FIXME: flush */
2206 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2207 udelay(20); /* FIXME: flush */
2208 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2210 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2212 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2214 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2217 /* spec mandates ">= 2ms" before checking status.
2218 * We wait 150ms, because that was the magic delay used for
2219 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2220 * between when the ATA command register is written, and then
2221 * status is checked. Because waiting for "a while" before
2222 * checking status is fine, post SRST, we perform this magic
2223 * delay here as well.
2225 * Old drivers/ide uses the 2mS rule and then waits for ready
2229 /* Before we perform post reset processing we want to see if
2230 * the bus shows 0xFF because the odd clown forgets the D7
2231 * pulldown resistor.
2233 if (ata_check_status(ap
) == 0xFF)
2234 return AC_ERR_OTHER
;
2236 ata_bus_post_reset(ap
, devmask
);
2242 * ata_bus_reset - reset host port and associated ATA channel
2243 * @ap: port to reset
2245 * This is typically the first time we actually start issuing
2246 * commands to the ATA channel. We wait for BSY to clear, then
2247 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2248 * result. Determine what devices, if any, are on the channel
2249 * by looking at the device 0/1 error register. Look at the signature
2250 * stored in each device's taskfile registers, to determine if
2251 * the device is ATA or ATAPI.
2254 * PCI/etc. bus probe sem.
2255 * Obtains host_set lock.
2258 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2261 void ata_bus_reset(struct ata_port
*ap
)
2263 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2264 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2266 unsigned int dev0
, dev1
= 0, devmask
= 0;
2268 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2270 /* determine if device 0/1 are present */
2271 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2274 dev0
= ata_devchk(ap
, 0);
2276 dev1
= ata_devchk(ap
, 1);
2280 devmask
|= (1 << 0);
2282 devmask
|= (1 << 1);
2284 /* select device 0 again */
2285 ap
->ops
->dev_select(ap
, 0);
2287 /* issue bus reset */
2288 if (ap
->flags
& ATA_FLAG_SRST
)
2289 if (ata_bus_softreset(ap
, devmask
))
2293 * determine by signature whether we have ATA or ATAPI devices
2295 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2296 if ((slave_possible
) && (err
!= 0x81))
2297 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2299 /* re-enable interrupts */
2300 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2303 /* is double-select really necessary? */
2304 if (ap
->device
[1].class != ATA_DEV_NONE
)
2305 ap
->ops
->dev_select(ap
, 1);
2306 if (ap
->device
[0].class != ATA_DEV_NONE
)
2307 ap
->ops
->dev_select(ap
, 0);
2309 /* if no devices were detected, disable this port */
2310 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2311 (ap
->device
[1].class == ATA_DEV_NONE
))
2314 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2315 /* set up device control for ATA_FLAG_SATA_RESET */
2316 if (ap
->flags
& ATA_FLAG_MMIO
)
2317 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2319 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2326 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2327 ap
->ops
->port_disable(ap
);
2332 static int sata_phy_resume(struct ata_port
*ap
)
2334 unsigned long timeout
= jiffies
+ (HZ
* 5);
2335 u32 scontrol
, sstatus
;
2337 scontrol
= scr_read(ap
, SCR_CONTROL
);
2338 scontrol
= (scontrol
& 0x0f0) | 0x300;
2339 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2341 /* Wait for phy to become ready, if necessary. */
2344 sstatus
= scr_read(ap
, SCR_STATUS
);
2345 if ((sstatus
& 0xf) != 1)
2347 } while (time_before(jiffies
, timeout
));
2353 * ata_std_probeinit - initialize probing
2354 * @ap: port to be probed
2356 * @ap is about to be probed. Initialize it. This function is
2357 * to be used as standard callback for ata_drive_probe_reset().
2359 * NOTE!!! Do not use this function as probeinit if a low level
2360 * driver implements only hardreset. Just pass NULL as probeinit
2361 * in that case. Using this function is probably okay but doing
2362 * so makes reset sequence different from the original
2363 * ->phy_reset implementation and Jeff nervous. :-P
2365 void ata_std_probeinit(struct ata_port
*ap
)
2367 if ((ap
->flags
& ATA_FLAG_SATA
) && ap
->ops
->scr_read
) {
2370 sata_phy_resume(ap
);
2372 spd
= (scr_read(ap
, SCR_CONTROL
) & 0xf0) >> 4;
2374 ap
->sata_spd_limit
&= (1 << spd
) - 1;
2376 if (sata_dev_present(ap
))
2377 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2382 * ata_std_softreset - reset host port via ATA SRST
2383 * @ap: port to reset
2384 * @verbose: fail verbosely
2385 * @classes: resulting classes of attached devices
2387 * Reset host port using ATA SRST. This function is to be used
2388 * as standard callback for ata_drive_*_reset() functions.
2391 * Kernel thread context (may sleep)
2394 * 0 on success, -errno otherwise.
2396 int ata_std_softreset(struct ata_port
*ap
, int verbose
, unsigned int *classes
)
2398 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2399 unsigned int devmask
= 0, err_mask
;
2404 if (ap
->ops
->scr_read
&& !sata_dev_present(ap
)) {
2405 classes
[0] = ATA_DEV_NONE
;
2409 /* determine if device 0/1 are present */
2410 if (ata_devchk(ap
, 0))
2411 devmask
|= (1 << 0);
2412 if (slave_possible
&& ata_devchk(ap
, 1))
2413 devmask
|= (1 << 1);
2415 /* select device 0 again */
2416 ap
->ops
->dev_select(ap
, 0);
2418 /* issue bus reset */
2419 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2420 err_mask
= ata_bus_softreset(ap
, devmask
);
2423 printk(KERN_ERR
"ata%u: SRST failed (err_mask=0x%x)\n",
2426 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
2431 /* determine by signature whether we have ATA or ATAPI devices */
2432 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2433 if (slave_possible
&& err
!= 0x81)
2434 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2437 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2442 * sata_std_hardreset - reset host port via SATA phy reset
2443 * @ap: port to reset
2444 * @verbose: fail verbosely
2445 * @class: resulting class of attached device
2447 * SATA phy-reset host port using DET bits of SControl register.
2448 * This function is to be used as standard callback for
2449 * ata_drive_*_reset().
2452 * Kernel thread context (may sleep)
2455 * 0 on success, -errno otherwise.
2457 int sata_std_hardreset(struct ata_port
*ap
, int verbose
, unsigned int *class)
2463 if (ata_set_sata_spd_needed(ap
)) {
2464 /* SATA spec says nothing about how to reconfigure
2465 * spd. To be on the safe side, turn off phy during
2466 * reconfiguration. This works for at least ICH7 AHCI
2469 scontrol
= scr_read(ap
, SCR_CONTROL
);
2470 scontrol
= (scontrol
& 0x0f0) | 0x302;
2471 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2473 ata_set_sata_spd(ap
);
2476 /* issue phy wake/reset */
2477 scontrol
= scr_read(ap
, SCR_CONTROL
);
2478 scontrol
= (scontrol
& 0x0f0) | 0x301;
2479 scr_write_flush(ap
, SCR_CONTROL
, scontrol
);
2481 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2482 * 10.4.2 says at least 1 ms.
2486 /* bring phy back */
2487 sata_phy_resume(ap
);
2489 /* TODO: phy layer with polling, timeouts, etc. */
2490 if (!sata_dev_present(ap
)) {
2491 *class = ATA_DEV_NONE
;
2492 DPRINTK("EXIT, link offline\n");
2496 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2498 printk(KERN_ERR
"ata%u: COMRESET failed "
2499 "(device not ready)\n", ap
->id
);
2501 DPRINTK("EXIT, device not ready\n");
2505 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2507 *class = ata_dev_try_classify(ap
, 0, NULL
);
2509 DPRINTK("EXIT, class=%u\n", *class);
2514 * ata_std_postreset - standard postreset callback
2515 * @ap: the target ata_port
2516 * @classes: classes of attached devices
2518 * This function is invoked after a successful reset. Note that
2519 * the device might have been reset more than once using
2520 * different reset methods before postreset is invoked.
2522 * This function is to be used as standard callback for
2523 * ata_drive_*_reset().
2526 * Kernel thread context (may sleep)
2528 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2532 /* set cable type if it isn't already set */
2533 if (ap
->cbl
== ATA_CBL_NONE
&& ap
->flags
& ATA_FLAG_SATA
)
2534 ap
->cbl
= ATA_CBL_SATA
;
2536 /* print link status */
2537 if (ap
->cbl
== ATA_CBL_SATA
)
2538 sata_print_link_status(ap
);
2540 /* re-enable interrupts */
2541 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2544 /* is double-select really necessary? */
2545 if (classes
[0] != ATA_DEV_NONE
)
2546 ap
->ops
->dev_select(ap
, 1);
2547 if (classes
[1] != ATA_DEV_NONE
)
2548 ap
->ops
->dev_select(ap
, 0);
2550 /* bail out if no device is present */
2551 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2552 DPRINTK("EXIT, no device\n");
2556 /* set up device control */
2557 if (ap
->ioaddr
.ctl_addr
) {
2558 if (ap
->flags
& ATA_FLAG_MMIO
)
2559 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2561 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2568 * ata_std_probe_reset - standard probe reset method
2569 * @ap: prot to perform probe-reset
2570 * @classes: resulting classes of attached devices
2572 * The stock off-the-shelf ->probe_reset method.
2575 * Kernel thread context (may sleep)
2578 * 0 on success, -errno otherwise.
2580 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2582 ata_reset_fn_t hardreset
;
2585 if (ap
->flags
& ATA_FLAG_SATA
&& ap
->ops
->scr_read
)
2586 hardreset
= sata_std_hardreset
;
2588 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2589 ata_std_softreset
, hardreset
,
2590 ata_std_postreset
, classes
);
2593 static int ata_do_reset(struct ata_port
*ap
,
2594 ata_reset_fn_t reset
, ata_postreset_fn_t postreset
,
2595 int verbose
, unsigned int *classes
)
2599 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2600 classes
[i
] = ATA_DEV_UNKNOWN
;
2602 rc
= reset(ap
, verbose
, classes
);
2606 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2607 * is complete and convert all ATA_DEV_UNKNOWN to
2610 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2611 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2614 if (i
< ATA_MAX_DEVICES
)
2615 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2616 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2617 classes
[i
] = ATA_DEV_NONE
;
2620 postreset(ap
, classes
);
2626 * ata_drive_probe_reset - Perform probe reset with given methods
2627 * @ap: port to reset
2628 * @probeinit: probeinit method (can be NULL)
2629 * @softreset: softreset method (can be NULL)
2630 * @hardreset: hardreset method (can be NULL)
2631 * @postreset: postreset method (can be NULL)
2632 * @classes: resulting classes of attached devices
2634 * Reset the specified port and classify attached devices using
2635 * given methods. This function prefers softreset but tries all
2636 * possible reset sequences to reset and classify devices. This
2637 * function is intended to be used for constructing ->probe_reset
2638 * callback by low level drivers.
2640 * Reset methods should follow the following rules.
2642 * - Return 0 on sucess, -errno on failure.
2643 * - If classification is supported, fill classes[] with
2644 * recognized class codes.
2645 * - If classification is not supported, leave classes[] alone.
2646 * - If verbose is non-zero, print error message on failure;
2647 * otherwise, shut up.
2650 * Kernel thread context (may sleep)
2653 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2654 * if classification fails, and any error code from reset
2657 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2658 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2659 ata_postreset_fn_t postreset
, unsigned int *classes
)
2666 if (softreset
&& !ata_set_sata_spd_needed(ap
)) {
2667 rc
= ata_do_reset(ap
, softreset
, postreset
, 0, classes
);
2668 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2670 printk(KERN_INFO
"ata%u: softreset failed, will try "
2671 "hardreset in 5 secs\n", ap
->id
);
2679 rc
= ata_do_reset(ap
, hardreset
, postreset
, 0, classes
);
2681 if (classes
[0] != ATA_DEV_UNKNOWN
)
2686 if (ata_down_sata_spd_limit(ap
))
2689 printk(KERN_INFO
"ata%u: hardreset failed, will retry "
2690 "in 5 secs\n", ap
->id
);
2695 printk(KERN_INFO
"ata%u: hardreset succeeded without "
2696 "classification, will retry softreset in 5 secs\n",
2700 rc
= ata_do_reset(ap
, softreset
, postreset
, 0, classes
);
2704 if (rc
== 0 && classes
[0] == ATA_DEV_UNKNOWN
)
2710 * ata_dev_same_device - Determine whether new ID matches configured device
2711 * @ap: port on which the device to compare against resides
2712 * @dev: device to compare against
2713 * @new_class: class of the new device
2714 * @new_id: IDENTIFY page of the new device
2716 * Compare @new_class and @new_id against @dev and determine
2717 * whether @dev is the device indicated by @new_class and
2724 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2726 static int ata_dev_same_device(struct ata_port
*ap
, struct ata_device
*dev
,
2727 unsigned int new_class
, const u16
*new_id
)
2729 const u16
*old_id
= dev
->id
;
2730 unsigned char model
[2][41], serial
[2][21];
2733 if (dev
->class != new_class
) {
2735 "ata%u: dev %u class mismatch %d != %d\n",
2736 ap
->id
, dev
->devno
, dev
->class, new_class
);
2740 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2741 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2742 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2743 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2744 new_n_sectors
= ata_id_n_sectors(new_id
);
2746 if (strcmp(model
[0], model
[1])) {
2748 "ata%u: dev %u model number mismatch '%s' != '%s'\n",
2749 ap
->id
, dev
->devno
, model
[0], model
[1]);
2753 if (strcmp(serial
[0], serial
[1])) {
2755 "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
2756 ap
->id
, dev
->devno
, serial
[0], serial
[1]);
2760 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2762 "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
2763 ap
->id
, dev
->devno
, (unsigned long long)dev
->n_sectors
,
2764 (unsigned long long)new_n_sectors
);
2772 * ata_dev_revalidate - Revalidate ATA device
2773 * @ap: port on which the device to revalidate resides
2774 * @dev: device to revalidate
2775 * @post_reset: is this revalidation after reset?
2777 * Re-read IDENTIFY page and make sure @dev is still attached to
2781 * Kernel thread context (may sleep)
2784 * 0 on success, negative errno otherwise
2786 int ata_dev_revalidate(struct ata_port
*ap
, struct ata_device
*dev
,
2793 if (!ata_dev_enabled(dev
))
2799 /* allocate & read ID data */
2800 rc
= ata_dev_read_id(ap
, dev
, &class, post_reset
, &id
);
2804 /* is the device still there? */
2805 if (!ata_dev_same_device(ap
, dev
, class, id
)) {
2813 /* configure device according to the new ID */
2814 return ata_dev_configure(ap
, dev
, 0);
2817 printk(KERN_ERR
"ata%u: dev %u revalidation failed (errno=%d)\n",
2818 ap
->id
, dev
->devno
, rc
);
2823 static const char * const ata_dma_blacklist
[] = {
2824 "WDC AC11000H", NULL
,
2825 "WDC AC22100H", NULL
,
2826 "WDC AC32500H", NULL
,
2827 "WDC AC33100H", NULL
,
2828 "WDC AC31600H", NULL
,
2829 "WDC AC32100H", "24.09P07",
2830 "WDC AC23200L", "21.10N21",
2831 "Compaq CRD-8241B", NULL
,
2836 "SanDisk SDP3B", NULL
,
2837 "SanDisk SDP3B-64", NULL
,
2838 "SANYO CD-ROM CRD", NULL
,
2839 "HITACHI CDR-8", NULL
,
2840 "HITACHI CDR-8335", NULL
,
2841 "HITACHI CDR-8435", NULL
,
2842 "Toshiba CD-ROM XM-6202B", NULL
,
2843 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2845 "E-IDE CD-ROM CR-840", NULL
,
2846 "CD-ROM Drive/F5A", NULL
,
2847 "WPI CDD-820", NULL
,
2848 "SAMSUNG CD-ROM SC-148C", NULL
,
2849 "SAMSUNG CD-ROM SC", NULL
,
2850 "SanDisk SDP3B-64", NULL
,
2851 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2852 "_NEC DV5800A", NULL
,
2853 "SAMSUNG CD-ROM SN-124", "N001"
2856 static int ata_strim(char *s
, size_t len
)
2858 len
= strnlen(s
, len
);
2860 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2861 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2868 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2870 unsigned char model_num
[40];
2871 unsigned char model_rev
[16];
2872 unsigned int nlen
, rlen
;
2875 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2877 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2879 nlen
= ata_strim(model_num
, sizeof(model_num
));
2880 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2882 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2883 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2884 if (ata_dma_blacklist
[i
+1] == NULL
)
2886 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2894 * ata_dev_xfermask - Compute supported xfermask of the given device
2895 * @ap: Port on which the device to compute xfermask for resides
2896 * @dev: Device to compute xfermask for
2898 * Compute supported xfermask of @dev and store it in
2899 * dev->*_mask. This function is responsible for applying all
2900 * known limits including host controller limits, device
2903 * FIXME: The current implementation limits all transfer modes to
2904 * the fastest of the lowested device on the port. This is not
2905 * required on most controllers.
2910 static void ata_dev_xfermask(struct ata_port
*ap
, struct ata_device
*dev
)
2912 struct ata_host_set
*hs
= ap
->host_set
;
2913 unsigned long xfer_mask
;
2916 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
, ap
->mwdma_mask
,
2919 /* FIXME: Use port-wide xfermask for now */
2920 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2921 struct ata_device
*d
= &ap
->device
[i
];
2922 if (!ata_dev_enabled(d
))
2924 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
, d
->mwdma_mask
,
2926 xfer_mask
&= ata_id_xfermask(d
->id
);
2927 if (ata_dma_blacklisted(d
))
2928 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2929 /* Apply cable rule here. Don't apply it early because when
2930 we handle hot plug the cable type can itself change */
2931 if (ap
->cbl
== ATA_CBL_PATA40
)
2932 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2935 if (ata_dma_blacklisted(dev
))
2936 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, "
2937 "disabling DMA\n", ap
->id
, dev
->devno
);
2939 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
2940 if (hs
->simplex_claimed
)
2941 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2943 if (ap
->ops
->mode_filter
)
2944 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
2946 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
2951 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2952 * @ap: Port associated with device @dev
2953 * @dev: Device to which command will be sent
2955 * Issue SET FEATURES - XFER MODE command to device @dev
2959 * PCI/etc. bus probe sem.
2962 * 0 on success, AC_ERR_* mask otherwise.
2965 static unsigned int ata_dev_set_xfermode(struct ata_port
*ap
,
2966 struct ata_device
*dev
)
2968 struct ata_taskfile tf
;
2969 unsigned int err_mask
;
2971 /* set up set-features taskfile */
2972 DPRINTK("set features - xfer mode\n");
2974 ata_tf_init(ap
, &tf
, dev
->devno
);
2975 tf
.command
= ATA_CMD_SET_FEATURES
;
2976 tf
.feature
= SETFEATURES_XFER
;
2977 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2978 tf
.protocol
= ATA_PROT_NODATA
;
2979 tf
.nsect
= dev
->xfer_mode
;
2981 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
2983 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
2988 * ata_dev_init_params - Issue INIT DEV PARAMS command
2989 * @ap: Port associated with device @dev
2990 * @dev: Device to which command will be sent
2993 * Kernel thread context (may sleep)
2996 * 0 on success, AC_ERR_* mask otherwise.
2999 static unsigned int ata_dev_init_params(struct ata_port
*ap
,
3000 struct ata_device
*dev
,
3004 struct ata_taskfile tf
;
3005 unsigned int err_mask
;
3007 /* Number of sectors per track 1-255. Number of heads 1-16 */
3008 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3009 return AC_ERR_INVALID
;
3011 /* set up init dev params taskfile */
3012 DPRINTK("init dev params \n");
3014 ata_tf_init(ap
, &tf
, dev
->devno
);
3015 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3016 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3017 tf
.protocol
= ATA_PROT_NODATA
;
3019 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3021 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
3023 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3028 * ata_sg_clean - Unmap DMA memory associated with command
3029 * @qc: Command containing DMA memory to be released
3031 * Unmap all mapped DMA memory associated with this command.
3034 * spin_lock_irqsave(host_set lock)
3037 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3039 struct ata_port
*ap
= qc
->ap
;
3040 struct scatterlist
*sg
= qc
->__sg
;
3041 int dir
= qc
->dma_dir
;
3042 void *pad_buf
= NULL
;
3044 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3045 WARN_ON(sg
== NULL
);
3047 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3048 WARN_ON(qc
->n_elem
> 1);
3050 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3052 /* if we padded the buffer out to 32-bit bound, and data
3053 * xfer direction is from-device, we must copy from the
3054 * pad buffer back into the supplied buffer
3056 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3057 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3059 if (qc
->flags
& ATA_QCFLAG_SG
) {
3061 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3062 /* restore last sg */
3063 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3065 struct scatterlist
*psg
= &qc
->pad_sgent
;
3066 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3067 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3068 kunmap_atomic(addr
, KM_IRQ0
);
3072 dma_unmap_single(ap
->dev
,
3073 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3076 sg
->length
+= qc
->pad_len
;
3078 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3079 pad_buf
, qc
->pad_len
);
3082 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3087 * ata_fill_sg - Fill PCI IDE PRD table
3088 * @qc: Metadata associated with taskfile to be transferred
3090 * Fill PCI IDE PRD (scatter-gather) table with segments
3091 * associated with the current disk command.
3094 * spin_lock_irqsave(host_set lock)
3097 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3099 struct ata_port
*ap
= qc
->ap
;
3100 struct scatterlist
*sg
;
3103 WARN_ON(qc
->__sg
== NULL
);
3104 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3107 ata_for_each_sg(sg
, qc
) {
3111 /* determine if physical DMA addr spans 64K boundary.
3112 * Note h/w doesn't support 64-bit, so we unconditionally
3113 * truncate dma_addr_t to u32.
3115 addr
= (u32
) sg_dma_address(sg
);
3116 sg_len
= sg_dma_len(sg
);
3119 offset
= addr
& 0xffff;
3121 if ((offset
+ sg_len
) > 0x10000)
3122 len
= 0x10000 - offset
;
3124 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3125 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3126 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3135 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3138 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3139 * @qc: Metadata associated with taskfile to check
3141 * Allow low-level driver to filter ATA PACKET commands, returning
3142 * a status indicating whether or not it is OK to use DMA for the
3143 * supplied PACKET command.
3146 * spin_lock_irqsave(host_set lock)
3148 * RETURNS: 0 when ATAPI DMA can be used
3151 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3153 struct ata_port
*ap
= qc
->ap
;
3154 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3156 if (ap
->ops
->check_atapi_dma
)
3157 rc
= ap
->ops
->check_atapi_dma(qc
);
3162 * ata_qc_prep - Prepare taskfile for submission
3163 * @qc: Metadata associated with taskfile to be prepared
3165 * Prepare ATA taskfile for submission.
3168 * spin_lock_irqsave(host_set lock)
3170 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3172 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3178 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3181 * ata_sg_init_one - Associate command with memory buffer
3182 * @qc: Command to be associated
3183 * @buf: Memory buffer
3184 * @buflen: Length of memory buffer, in bytes.
3186 * Initialize the data-related elements of queued_cmd @qc
3187 * to point to a single memory buffer, @buf of byte length @buflen.
3190 * spin_lock_irqsave(host_set lock)
3193 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3195 struct scatterlist
*sg
;
3197 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3199 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3200 qc
->__sg
= &qc
->sgent
;
3202 qc
->orig_n_elem
= 1;
3206 sg_init_one(sg
, buf
, buflen
);
3210 * ata_sg_init - Associate command with scatter-gather table.
3211 * @qc: Command to be associated
3212 * @sg: Scatter-gather table.
3213 * @n_elem: Number of elements in s/g table.
3215 * Initialize the data-related elements of queued_cmd @qc
3216 * to point to a scatter-gather table @sg, containing @n_elem
3220 * spin_lock_irqsave(host_set lock)
3223 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3224 unsigned int n_elem
)
3226 qc
->flags
|= ATA_QCFLAG_SG
;
3228 qc
->n_elem
= n_elem
;
3229 qc
->orig_n_elem
= n_elem
;
3233 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3234 * @qc: Command with memory buffer to be mapped.
3236 * DMA-map the memory buffer associated with queued_cmd @qc.
3239 * spin_lock_irqsave(host_set lock)
3242 * Zero on success, negative on error.
3245 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3247 struct ata_port
*ap
= qc
->ap
;
3248 int dir
= qc
->dma_dir
;
3249 struct scatterlist
*sg
= qc
->__sg
;
3250 dma_addr_t dma_address
;
3253 /* we must lengthen transfers to end on a 32-bit boundary */
3254 qc
->pad_len
= sg
->length
& 3;
3256 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3257 struct scatterlist
*psg
= &qc
->pad_sgent
;
3259 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3261 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3263 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3264 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3267 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3268 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3270 sg
->length
-= qc
->pad_len
;
3271 if (sg
->length
== 0)
3274 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3275 sg
->length
, qc
->pad_len
);
3283 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3285 if (dma_mapping_error(dma_address
)) {
3287 sg
->length
+= qc
->pad_len
;
3291 sg_dma_address(sg
) = dma_address
;
3292 sg_dma_len(sg
) = sg
->length
;
3295 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3296 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3302 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3303 * @qc: Command with scatter-gather table to be mapped.
3305 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3308 * spin_lock_irqsave(host_set lock)
3311 * Zero on success, negative on error.
3315 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3317 struct ata_port
*ap
= qc
->ap
;
3318 struct scatterlist
*sg
= qc
->__sg
;
3319 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3320 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3322 VPRINTK("ENTER, ata%u\n", ap
->id
);
3323 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3325 /* we must lengthen transfers to end on a 32-bit boundary */
3326 qc
->pad_len
= lsg
->length
& 3;
3328 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3329 struct scatterlist
*psg
= &qc
->pad_sgent
;
3330 unsigned int offset
;
3332 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3334 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3337 * psg->page/offset are used to copy to-be-written
3338 * data in this function or read data in ata_sg_clean.
3340 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3341 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3342 psg
->offset
= offset_in_page(offset
);
3344 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3345 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3346 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3347 kunmap_atomic(addr
, KM_IRQ0
);
3350 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3351 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3353 lsg
->length
-= qc
->pad_len
;
3354 if (lsg
->length
== 0)
3357 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3358 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3361 pre_n_elem
= qc
->n_elem
;
3362 if (trim_sg
&& pre_n_elem
)
3371 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3373 /* restore last sg */
3374 lsg
->length
+= qc
->pad_len
;
3378 DPRINTK("%d sg elements mapped\n", n_elem
);
3381 qc
->n_elem
= n_elem
;
3387 * ata_poll_qc_complete - turn irq back on and finish qc
3388 * @qc: Command to complete
3389 * @err_mask: ATA status register content
3392 * None. (grabs host lock)
3395 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3397 struct ata_port
*ap
= qc
->ap
;
3398 unsigned long flags
;
3400 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3401 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3403 ata_qc_complete(qc
);
3404 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3408 * ata_pio_poll - poll using PIO, depending on current state
3409 * @ap: the target ata_port
3412 * None. (executing in kernel thread context)
3415 * timeout value to use
3418 static unsigned long ata_pio_poll(struct ata_port
*ap
)
3420 struct ata_queued_cmd
*qc
;
3422 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3423 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3425 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3426 WARN_ON(qc
== NULL
);
3428 switch (ap
->hsm_task_state
) {
3431 poll_state
= HSM_ST_POLL
;
3435 case HSM_ST_LAST_POLL
:
3436 poll_state
= HSM_ST_LAST_POLL
;
3437 reg_state
= HSM_ST_LAST
;
3444 status
= ata_chk_status(ap
);
3445 if (status
& ATA_BUSY
) {
3446 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3447 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3448 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3451 ap
->hsm_task_state
= poll_state
;
3452 return ATA_SHORT_PAUSE
;
3455 ap
->hsm_task_state
= reg_state
;
3460 * ata_pio_complete - check if drive is busy or idle
3461 * @ap: the target ata_port
3464 * None. (executing in kernel thread context)
3467 * Non-zero if qc completed, zero otherwise.
3470 static int ata_pio_complete (struct ata_port
*ap
)
3472 struct ata_queued_cmd
*qc
;
3476 * This is purely heuristic. This is a fast path. Sometimes when
3477 * we enter, BSY will be cleared in a chk-status or two. If not,
3478 * the drive is probably seeking or something. Snooze for a couple
3479 * msecs, then chk-status again. If still busy, fall back to
3480 * HSM_ST_POLL state.
3482 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3483 if (drv_stat
& ATA_BUSY
) {
3485 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3486 if (drv_stat
& ATA_BUSY
) {
3487 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3488 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3493 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3494 WARN_ON(qc
== NULL
);
3496 drv_stat
= ata_wait_idle(ap
);
3497 if (!ata_ok(drv_stat
)) {
3498 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3499 ap
->hsm_task_state
= HSM_ST_ERR
;
3503 ap
->hsm_task_state
= HSM_ST_IDLE
;
3505 WARN_ON(qc
->err_mask
);
3506 ata_poll_qc_complete(qc
);
3508 /* another command may start at this point */
3515 * swap_buf_le16 - swap halves of 16-bit words in place
3516 * @buf: Buffer to swap
3517 * @buf_words: Number of 16-bit words in buffer.
3519 * Swap halves of 16-bit words if needed to convert from
3520 * little-endian byte order to native cpu byte order, or
3524 * Inherited from caller.
3526 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3531 for (i
= 0; i
< buf_words
; i
++)
3532 buf
[i
] = le16_to_cpu(buf
[i
]);
3533 #endif /* __BIG_ENDIAN */
3537 * ata_mmio_data_xfer - Transfer data by MMIO
3538 * @ap: port to read/write
3540 * @buflen: buffer length
3541 * @write_data: read/write
3543 * Transfer data from/to the device data register by MMIO.
3546 * Inherited from caller.
3549 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3550 unsigned int buflen
, int write_data
)
3553 unsigned int words
= buflen
>> 1;
3554 u16
*buf16
= (u16
*) buf
;
3555 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3557 /* Transfer multiple of 2 bytes */
3559 for (i
= 0; i
< words
; i
++)
3560 writew(le16_to_cpu(buf16
[i
]), mmio
);
3562 for (i
= 0; i
< words
; i
++)
3563 buf16
[i
] = cpu_to_le16(readw(mmio
));
3566 /* Transfer trailing 1 byte, if any. */
3567 if (unlikely(buflen
& 0x01)) {
3568 u16 align_buf
[1] = { 0 };
3569 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3572 memcpy(align_buf
, trailing_buf
, 1);
3573 writew(le16_to_cpu(align_buf
[0]), mmio
);
3575 align_buf
[0] = cpu_to_le16(readw(mmio
));
3576 memcpy(trailing_buf
, align_buf
, 1);
3582 * ata_pio_data_xfer - Transfer data by PIO
3583 * @ap: port to read/write
3585 * @buflen: buffer length
3586 * @write_data: read/write
3588 * Transfer data from/to the device data register by PIO.
3591 * Inherited from caller.
3594 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3595 unsigned int buflen
, int write_data
)
3597 unsigned int words
= buflen
>> 1;
3599 /* Transfer multiple of 2 bytes */
3601 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3603 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3605 /* Transfer trailing 1 byte, if any. */
3606 if (unlikely(buflen
& 0x01)) {
3607 u16 align_buf
[1] = { 0 };
3608 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3611 memcpy(align_buf
, trailing_buf
, 1);
3612 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3614 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3615 memcpy(trailing_buf
, align_buf
, 1);
3621 * ata_data_xfer - Transfer data from/to the data register.
3622 * @ap: port to read/write
3624 * @buflen: buffer length
3625 * @do_write: read/write
3627 * Transfer data from/to the device data register.
3630 * Inherited from caller.
3633 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3634 unsigned int buflen
, int do_write
)
3636 /* Make the crap hardware pay the costs not the good stuff */
3637 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3638 unsigned long flags
;
3639 local_irq_save(flags
);
3640 if (ap
->flags
& ATA_FLAG_MMIO
)
3641 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3643 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3644 local_irq_restore(flags
);
3646 if (ap
->flags
& ATA_FLAG_MMIO
)
3647 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3649 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3654 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3655 * @qc: Command on going
3657 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3660 * Inherited from caller.
3663 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3665 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3666 struct scatterlist
*sg
= qc
->__sg
;
3667 struct ata_port
*ap
= qc
->ap
;
3669 unsigned int offset
;
3672 if (qc
->cursect
== (qc
->nsect
- 1))
3673 ap
->hsm_task_state
= HSM_ST_LAST
;
3675 page
= sg
[qc
->cursg
].page
;
3676 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3678 /* get the current page and offset */
3679 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3680 offset
%= PAGE_SIZE
;
3682 buf
= kmap(page
) + offset
;
3687 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3692 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3694 /* do the actual data transfer */
3695 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3696 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3702 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3703 * @qc: Command on going
3704 * @bytes: number of bytes
3706 * Transfer Transfer data from/to the ATAPI device.
3709 * Inherited from caller.
3713 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3715 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3716 struct scatterlist
*sg
= qc
->__sg
;
3717 struct ata_port
*ap
= qc
->ap
;
3720 unsigned int offset
, count
;
3722 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3723 ap
->hsm_task_state
= HSM_ST_LAST
;
3726 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3728 * The end of qc->sg is reached and the device expects
3729 * more data to transfer. In order not to overrun qc->sg
3730 * and fulfill length specified in the byte count register,
3731 * - for read case, discard trailing data from the device
3732 * - for write case, padding zero data to the device
3734 u16 pad_buf
[1] = { 0 };
3735 unsigned int words
= bytes
>> 1;
3738 if (words
) /* warning if bytes > 1 */
3739 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3742 for (i
= 0; i
< words
; i
++)
3743 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3745 ap
->hsm_task_state
= HSM_ST_LAST
;
3749 sg
= &qc
->__sg
[qc
->cursg
];
3752 offset
= sg
->offset
+ qc
->cursg_ofs
;
3754 /* get the current page and offset */
3755 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3756 offset
%= PAGE_SIZE
;
3758 /* don't overrun current sg */
3759 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3761 /* don't cross page boundaries */
3762 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3764 buf
= kmap(page
) + offset
;
3767 qc
->curbytes
+= count
;
3768 qc
->cursg_ofs
+= count
;
3770 if (qc
->cursg_ofs
== sg
->length
) {
3775 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3777 /* do the actual data transfer */
3778 ata_data_xfer(ap
, buf
, count
, do_write
);
3787 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3788 * @qc: Command on going
3790 * Transfer Transfer data from/to the ATAPI device.
3793 * Inherited from caller.
3796 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3798 struct ata_port
*ap
= qc
->ap
;
3799 struct ata_device
*dev
= qc
->dev
;
3800 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3801 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3803 ap
->ops
->tf_read(ap
, &qc
->tf
);
3804 ireason
= qc
->tf
.nsect
;
3805 bc_lo
= qc
->tf
.lbam
;
3806 bc_hi
= qc
->tf
.lbah
;
3807 bytes
= (bc_hi
<< 8) | bc_lo
;
3809 /* shall be cleared to zero, indicating xfer of data */
3810 if (ireason
& (1 << 0))
3813 /* make sure transfer direction matches expected */
3814 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3815 if (do_write
!= i_write
)
3818 __atapi_pio_bytes(qc
, bytes
);
3823 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3824 ap
->id
, dev
->devno
);
3825 qc
->err_mask
|= AC_ERR_HSM
;
3826 ap
->hsm_task_state
= HSM_ST_ERR
;
3830 * ata_pio_block - start PIO on a block
3831 * @ap: the target ata_port
3834 * None. (executing in kernel thread context)
3837 static void ata_pio_block(struct ata_port
*ap
)
3839 struct ata_queued_cmd
*qc
;
3843 * This is purely heuristic. This is a fast path.
3844 * Sometimes when we enter, BSY will be cleared in
3845 * a chk-status or two. If not, the drive is probably seeking
3846 * or something. Snooze for a couple msecs, then
3847 * chk-status again. If still busy, fall back to
3848 * HSM_ST_POLL state.
3850 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3851 if (status
& ATA_BUSY
) {
3853 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3854 if (status
& ATA_BUSY
) {
3855 ap
->hsm_task_state
= HSM_ST_POLL
;
3856 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3861 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3862 WARN_ON(qc
== NULL
);
3865 if (status
& (ATA_ERR
| ATA_DF
)) {
3866 qc
->err_mask
|= AC_ERR_DEV
;
3867 ap
->hsm_task_state
= HSM_ST_ERR
;
3871 /* transfer data if any */
3872 if (is_atapi_taskfile(&qc
->tf
)) {
3873 /* DRQ=0 means no more data to transfer */
3874 if ((status
& ATA_DRQ
) == 0) {
3875 ap
->hsm_task_state
= HSM_ST_LAST
;
3879 atapi_pio_bytes(qc
);
3881 /* handle BSY=0, DRQ=0 as error */
3882 if ((status
& ATA_DRQ
) == 0) {
3883 qc
->err_mask
|= AC_ERR_HSM
;
3884 ap
->hsm_task_state
= HSM_ST_ERR
;
3892 static void ata_pio_error(struct ata_port
*ap
)
3894 struct ata_queued_cmd
*qc
;
3896 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3897 WARN_ON(qc
== NULL
);
3899 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3900 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3902 /* make sure qc->err_mask is available to
3903 * know what's wrong and recover
3905 WARN_ON(qc
->err_mask
== 0);
3907 ap
->hsm_task_state
= HSM_ST_IDLE
;
3909 ata_poll_qc_complete(qc
);
3912 static void ata_pio_task(void *_data
)
3914 struct ata_port
*ap
= _data
;
3915 unsigned long timeout
;
3922 switch (ap
->hsm_task_state
) {
3931 qc_completed
= ata_pio_complete(ap
);
3935 case HSM_ST_LAST_POLL
:
3936 timeout
= ata_pio_poll(ap
);
3946 ata_port_queue_task(ap
, ata_pio_task
, ap
, timeout
);
3947 else if (!qc_completed
)
3952 * atapi_packet_task - Write CDB bytes to hardware
3953 * @_data: Port to which ATAPI device is attached.
3955 * When device has indicated its readiness to accept
3956 * a CDB, this function is called. Send the CDB.
3957 * If DMA is to be performed, exit immediately.
3958 * Otherwise, we are in polling mode, so poll
3959 * status under operation succeeds or fails.
3962 * Kernel thread context (may sleep)
3965 static void atapi_packet_task(void *_data
)
3967 struct ata_port
*ap
= _data
;
3968 struct ata_queued_cmd
*qc
;
3971 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3972 WARN_ON(qc
== NULL
);
3973 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
3975 /* sleep-wait for BSY to clear */
3976 DPRINTK("busy wait\n");
3977 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3978 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3982 /* make sure DRQ is set */
3983 status
= ata_chk_status(ap
);
3984 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
3985 qc
->err_mask
|= AC_ERR_HSM
;
3990 DPRINTK("send cdb\n");
3991 WARN_ON(qc
->dev
->cdb_len
< 12);
3993 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
3994 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
3995 unsigned long flags
;
3997 /* Once we're done issuing command and kicking bmdma,
3998 * irq handler takes over. To not lose irq, we need
3999 * to clear NOINTR flag before sending cdb, but
4000 * interrupt handler shouldn't be invoked before we're
4001 * finished. Hence, the following locking.
4003 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4004 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4005 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4006 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4007 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4008 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4010 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4012 /* PIO commands are handled by polling */
4013 ap
->hsm_task_state
= HSM_ST
;
4014 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4020 ata_poll_qc_complete(qc
);
4024 * ata_qc_timeout - Handle timeout of queued command
4025 * @qc: Command that timed out
4027 * Some part of the kernel (currently, only the SCSI layer)
4028 * has noticed that the active command on port @ap has not
4029 * completed after a specified length of time. Handle this
4030 * condition by disabling DMA (if necessary) and completing
4031 * transactions, with error if necessary.
4033 * This also handles the case of the "lost interrupt", where
4034 * for some reason (possibly hardware bug, possibly driver bug)
4035 * an interrupt was not delivered to the driver, even though the
4036 * transaction completed successfully.
4039 * Inherited from SCSI layer (none, can sleep)
4042 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
4044 struct ata_port
*ap
= qc
->ap
;
4045 struct ata_host_set
*host_set
= ap
->host_set
;
4046 u8 host_stat
= 0, drv_stat
;
4047 unsigned long flags
;
4051 ap
->hsm_task_state
= HSM_ST_IDLE
;
4053 spin_lock_irqsave(&host_set
->lock
, flags
);
4055 switch (qc
->tf
.protocol
) {
4058 case ATA_PROT_ATAPI_DMA
:
4059 host_stat
= ap
->ops
->bmdma_status(ap
);
4061 /* before we do anything else, clear DMA-Start bit */
4062 ap
->ops
->bmdma_stop(qc
);
4068 drv_stat
= ata_chk_status(ap
);
4070 /* ack bmdma irq events */
4071 ap
->ops
->irq_clear(ap
);
4073 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
4074 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
4076 /* complete taskfile transaction */
4077 qc
->err_mask
|= ac_err_mask(drv_stat
);
4081 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4083 ata_eh_qc_complete(qc
);
4089 * ata_eng_timeout - Handle timeout of queued command
4090 * @ap: Port on which timed-out command is active
4092 * Some part of the kernel (currently, only the SCSI layer)
4093 * has noticed that the active command on port @ap has not
4094 * completed after a specified length of time. Handle this
4095 * condition by disabling DMA (if necessary) and completing
4096 * transactions, with error if necessary.
4098 * This also handles the case of the "lost interrupt", where
4099 * for some reason (possibly hardware bug, possibly driver bug)
4100 * an interrupt was not delivered to the driver, even though the
4101 * transaction completed successfully.
4104 * Inherited from SCSI layer (none, can sleep)
4107 void ata_eng_timeout(struct ata_port
*ap
)
4111 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
4117 * ata_qc_new - Request an available ATA command, for queueing
4118 * @ap: Port associated with device @dev
4119 * @dev: Device from whom we request an available command structure
4125 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4127 struct ata_queued_cmd
*qc
= NULL
;
4130 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
4131 if (!test_and_set_bit(i
, &ap
->qactive
)) {
4132 qc
= ata_qc_from_tag(ap
, i
);
4143 * ata_qc_new_init - Request an available ATA command, and initialize it
4144 * @ap: Port associated with device @dev
4145 * @dev: Device from whom we request an available command structure
4151 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
4152 struct ata_device
*dev
)
4154 struct ata_queued_cmd
*qc
;
4156 qc
= ata_qc_new(ap
);
4169 * ata_qc_free - free unused ata_queued_cmd
4170 * @qc: Command to complete
4172 * Designed to free unused ata_queued_cmd object
4173 * in case something prevents using it.
4176 * spin_lock_irqsave(host_set lock)
4178 void ata_qc_free(struct ata_queued_cmd
*qc
)
4180 struct ata_port
*ap
= qc
->ap
;
4183 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4187 if (likely(ata_tag_valid(tag
))) {
4188 if (tag
== ap
->active_tag
)
4189 ap
->active_tag
= ATA_TAG_POISON
;
4190 qc
->tag
= ATA_TAG_POISON
;
4191 clear_bit(tag
, &ap
->qactive
);
4195 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4197 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4198 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4200 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4203 /* atapi: mark qc as inactive to prevent the interrupt handler
4204 * from completing the command twice later, before the error handler
4205 * is called. (when rc != 0 and atapi request sense is needed)
4207 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4209 /* call completion callback */
4210 qc
->complete_fn(qc
);
4213 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4215 struct ata_port
*ap
= qc
->ap
;
4217 switch (qc
->tf
.protocol
) {
4219 case ATA_PROT_ATAPI_DMA
:
4222 case ATA_PROT_ATAPI
:
4224 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4237 * ata_qc_issue - issue taskfile to device
4238 * @qc: command to issue to device
4240 * Prepare an ATA command to submission to device.
4241 * This includes mapping the data into a DMA-able
4242 * area, filling in the S/G table, and finally
4243 * writing the taskfile to hardware, starting the command.
4246 * spin_lock_irqsave(host_set lock)
4248 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4250 struct ata_port
*ap
= qc
->ap
;
4252 qc
->ap
->active_tag
= qc
->tag
;
4253 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4255 if (ata_should_dma_map(qc
)) {
4256 if (qc
->flags
& ATA_QCFLAG_SG
) {
4257 if (ata_sg_setup(qc
))
4259 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4260 if (ata_sg_setup_one(qc
))
4264 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4267 ap
->ops
->qc_prep(qc
);
4269 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4270 if (unlikely(qc
->err_mask
))
4275 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4276 qc
->err_mask
|= AC_ERR_SYSTEM
;
4278 ata_qc_complete(qc
);
4282 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4283 * @qc: command to issue to device
4285 * Using various libata functions and hooks, this function
4286 * starts an ATA command. ATA commands are grouped into
4287 * classes called "protocols", and issuing each type of protocol
4288 * is slightly different.
4290 * May be used as the qc_issue() entry in ata_port_operations.
4293 * spin_lock_irqsave(host_set lock)
4296 * Zero on success, AC_ERR_* mask on failure
4299 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4301 struct ata_port
*ap
= qc
->ap
;
4303 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4305 switch (qc
->tf
.protocol
) {
4306 case ATA_PROT_NODATA
:
4307 ata_tf_to_host(ap
, &qc
->tf
);
4311 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4312 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4313 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4316 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4317 ata_qc_set_polling(qc
);
4318 ata_tf_to_host(ap
, &qc
->tf
);
4319 ap
->hsm_task_state
= HSM_ST
;
4320 ata_port_queue_task(ap
, ata_pio_task
, ap
, 0);
4323 case ATA_PROT_ATAPI
:
4324 ata_qc_set_polling(qc
);
4325 ata_tf_to_host(ap
, &qc
->tf
);
4326 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4329 case ATA_PROT_ATAPI_NODATA
:
4330 ap
->flags
|= ATA_FLAG_NOINTR
;
4331 ata_tf_to_host(ap
, &qc
->tf
);
4332 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4335 case ATA_PROT_ATAPI_DMA
:
4336 ap
->flags
|= ATA_FLAG_NOINTR
;
4337 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4338 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4339 ata_port_queue_task(ap
, atapi_packet_task
, ap
, 0);
4344 return AC_ERR_SYSTEM
;
4351 * ata_host_intr - Handle host interrupt for given (port, task)
4352 * @ap: Port on which interrupt arrived (possibly...)
4353 * @qc: Taskfile currently active in engine
4355 * Handle host interrupt for given queued command. Currently,
4356 * only DMA interrupts are handled. All other commands are
4357 * handled via polling with interrupts disabled (nIEN bit).
4360 * spin_lock_irqsave(host_set lock)
4363 * One if interrupt was handled, zero if not (shared irq).
4366 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4367 struct ata_queued_cmd
*qc
)
4369 u8 status
, host_stat
;
4371 switch (qc
->tf
.protocol
) {
4374 case ATA_PROT_ATAPI_DMA
:
4375 case ATA_PROT_ATAPI
:
4376 /* check status of DMA engine */
4377 host_stat
= ap
->ops
->bmdma_status(ap
);
4378 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4380 /* if it's not our irq... */
4381 if (!(host_stat
& ATA_DMA_INTR
))
4384 /* before we do anything else, clear DMA-Start bit */
4385 ap
->ops
->bmdma_stop(qc
);
4389 case ATA_PROT_ATAPI_NODATA
:
4390 case ATA_PROT_NODATA
:
4391 /* check altstatus */
4392 status
= ata_altstatus(ap
);
4393 if (status
& ATA_BUSY
)
4396 /* check main status, clearing INTRQ */
4397 status
= ata_chk_status(ap
);
4398 if (unlikely(status
& ATA_BUSY
))
4400 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4401 ap
->id
, qc
->tf
.protocol
, status
);
4403 /* ack bmdma irq events */
4404 ap
->ops
->irq_clear(ap
);
4406 /* complete taskfile transaction */
4407 qc
->err_mask
|= ac_err_mask(status
);
4408 ata_qc_complete(qc
);
4415 return 1; /* irq handled */
4418 ap
->stats
.idle_irq
++;
4421 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4422 ata_irq_ack(ap
, 0); /* debug trap */
4423 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4427 return 0; /* irq not handled */
4431 * ata_interrupt - Default ATA host interrupt handler
4432 * @irq: irq line (unused)
4433 * @dev_instance: pointer to our ata_host_set information structure
4436 * Default interrupt handler for PCI IDE devices. Calls
4437 * ata_host_intr() for each port that is not disabled.
4440 * Obtains host_set lock during operation.
4443 * IRQ_NONE or IRQ_HANDLED.
4446 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4448 struct ata_host_set
*host_set
= dev_instance
;
4450 unsigned int handled
= 0;
4451 unsigned long flags
;
4453 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4454 spin_lock_irqsave(&host_set
->lock
, flags
);
4456 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4457 struct ata_port
*ap
;
4459 ap
= host_set
->ports
[i
];
4461 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4462 struct ata_queued_cmd
*qc
;
4464 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4465 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4466 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4467 handled
|= ata_host_intr(ap
, qc
);
4471 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4473 return IRQ_RETVAL(handled
);
4478 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4479 * without filling any other registers
4481 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4484 struct ata_taskfile tf
;
4487 ata_tf_init(ap
, &tf
, dev
->devno
);
4490 tf
.flags
|= ATA_TFLAG_DEVICE
;
4491 tf
.protocol
= ATA_PROT_NODATA
;
4493 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4495 printk(KERN_ERR
"%s: ata command failed: %d\n",
4501 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4505 if (!ata_try_flush_cache(dev
))
4508 if (ata_id_has_flush_ext(dev
->id
))
4509 cmd
= ATA_CMD_FLUSH_EXT
;
4511 cmd
= ATA_CMD_FLUSH
;
4513 return ata_do_simple_cmd(ap
, dev
, cmd
);
4516 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4518 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4521 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4523 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4527 * ata_device_resume - wakeup a previously suspended devices
4528 * @ap: port the device is connected to
4529 * @dev: the device to resume
4531 * Kick the drive back into action, by sending it an idle immediate
4532 * command and making sure its transfer mode matches between drive
4536 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4538 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4539 struct ata_device
*failed_dev
;
4540 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4541 while (ata_set_mode(ap
, &failed_dev
))
4542 ata_dev_disable(ap
, failed_dev
);
4544 if (!ata_dev_enabled(dev
))
4546 if (dev
->class == ATA_DEV_ATA
)
4547 ata_start_drive(ap
, dev
);
4553 * ata_device_suspend - prepare a device for suspend
4554 * @ap: port the device is connected to
4555 * @dev: the device to suspend
4557 * Flush the cache on the drive, if appropriate, then issue a
4558 * standbynow command.
4560 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
, pm_message_t state
)
4562 if (!ata_dev_enabled(dev
))
4564 if (dev
->class == ATA_DEV_ATA
)
4565 ata_flush_cache(ap
, dev
);
4567 if (state
.event
!= PM_EVENT_FREEZE
)
4568 ata_standby_drive(ap
, dev
);
4569 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4574 * ata_port_start - Set port up for dma.
4575 * @ap: Port to initialize
4577 * Called just after data structures for each port are
4578 * initialized. Allocates space for PRD table.
4580 * May be used as the port_start() entry in ata_port_operations.
4583 * Inherited from caller.
4586 int ata_port_start (struct ata_port
*ap
)
4588 struct device
*dev
= ap
->dev
;
4591 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4595 rc
= ata_pad_alloc(ap
, dev
);
4597 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4601 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4608 * ata_port_stop - Undo ata_port_start()
4609 * @ap: Port to shut down
4611 * Frees the PRD table.
4613 * May be used as the port_stop() entry in ata_port_operations.
4616 * Inherited from caller.
4619 void ata_port_stop (struct ata_port
*ap
)
4621 struct device
*dev
= ap
->dev
;
4623 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4624 ata_pad_free(ap
, dev
);
4627 void ata_host_stop (struct ata_host_set
*host_set
)
4629 if (host_set
->mmio_base
)
4630 iounmap(host_set
->mmio_base
);
4635 * ata_host_remove - Unregister SCSI host structure with upper layers
4636 * @ap: Port to unregister
4637 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4640 * Inherited from caller.
4643 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4645 struct Scsi_Host
*sh
= ap
->host
;
4650 scsi_remove_host(sh
);
4652 ap
->ops
->port_stop(ap
);
4656 * ata_host_init - Initialize an ata_port structure
4657 * @ap: Structure to initialize
4658 * @host: associated SCSI mid-layer structure
4659 * @host_set: Collection of hosts to which @ap belongs
4660 * @ent: Probe information provided by low-level driver
4661 * @port_no: Port number associated with this ata_port
4663 * Initialize a new ata_port structure, and its associated
4667 * Inherited from caller.
4670 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4671 struct ata_host_set
*host_set
,
4672 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4678 host
->max_channel
= 1;
4679 host
->unique_id
= ata_unique_id
++;
4680 host
->max_cmd_len
= 12;
4682 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4683 ap
->id
= host
->unique_id
;
4685 ap
->ctl
= ATA_DEVCTL_OBS
;
4686 ap
->host_set
= host_set
;
4688 ap
->port_no
= port_no
;
4690 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4691 ap
->pio_mask
= ent
->pio_mask
;
4692 ap
->mwdma_mask
= ent
->mwdma_mask
;
4693 ap
->udma_mask
= ent
->udma_mask
;
4694 ap
->flags
|= ent
->host_flags
;
4695 ap
->ops
= ent
->port_ops
;
4696 ap
->cbl
= ATA_CBL_NONE
;
4697 ap
->sata_spd_limit
= UINT_MAX
;
4698 ap
->active_tag
= ATA_TAG_POISON
;
4699 ap
->last_ctl
= 0xFF;
4701 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4702 INIT_LIST_HEAD(&ap
->eh_done_q
);
4704 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
4705 struct ata_device
*dev
= &ap
->device
[i
];
4707 dev
->pio_mask
= UINT_MAX
;
4708 dev
->mwdma_mask
= UINT_MAX
;
4709 dev
->udma_mask
= UINT_MAX
;
4713 ap
->stats
.unhandled_irq
= 1;
4714 ap
->stats
.idle_irq
= 1;
4717 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4721 * ata_host_add - Attach low-level ATA driver to system
4722 * @ent: Information provided by low-level driver
4723 * @host_set: Collections of ports to which we add
4724 * @port_no: Port number associated with this host
4726 * Attach low-level ATA driver to system.
4729 * PCI/etc. bus probe sem.
4732 * New ata_port on success, for NULL on error.
4735 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4736 struct ata_host_set
*host_set
,
4737 unsigned int port_no
)
4739 struct Scsi_Host
*host
;
4740 struct ata_port
*ap
;
4745 if (!ent
->port_ops
->probe_reset
&&
4746 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
4747 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
4752 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4756 host
->transportt
= &ata_scsi_transport_template
;
4758 ap
= (struct ata_port
*) &host
->hostdata
[0];
4760 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4762 rc
= ap
->ops
->port_start(ap
);
4769 scsi_host_put(host
);
4774 * ata_device_add - Register hardware device with ATA and SCSI layers
4775 * @ent: Probe information describing hardware device to be registered
4777 * This function processes the information provided in the probe
4778 * information struct @ent, allocates the necessary ATA and SCSI
4779 * host information structures, initializes them, and registers
4780 * everything with requisite kernel subsystems.
4782 * This function requests irqs, probes the ATA bus, and probes
4786 * PCI/etc. bus probe sem.
4789 * Number of ports registered. Zero on error (no ports registered).
4792 int ata_device_add(const struct ata_probe_ent
*ent
)
4794 unsigned int count
= 0, i
;
4795 struct device
*dev
= ent
->dev
;
4796 struct ata_host_set
*host_set
;
4799 /* alloc a container for our list of ATA ports (buses) */
4800 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4801 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4804 spin_lock_init(&host_set
->lock
);
4806 host_set
->dev
= dev
;
4807 host_set
->n_ports
= ent
->n_ports
;
4808 host_set
->irq
= ent
->irq
;
4809 host_set
->mmio_base
= ent
->mmio_base
;
4810 host_set
->private_data
= ent
->private_data
;
4811 host_set
->ops
= ent
->port_ops
;
4812 host_set
->flags
= ent
->host_set_flags
;
4814 /* register each port bound to this device */
4815 for (i
= 0; i
< ent
->n_ports
; i
++) {
4816 struct ata_port
*ap
;
4817 unsigned long xfer_mode_mask
;
4819 ap
= ata_host_add(ent
, host_set
, i
);
4823 host_set
->ports
[i
] = ap
;
4824 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4825 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4826 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4828 /* print per-port info to dmesg */
4829 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4830 "bmdma 0x%lX irq %lu\n",
4832 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4833 ata_mode_string(xfer_mode_mask
),
4834 ap
->ioaddr
.cmd_addr
,
4835 ap
->ioaddr
.ctl_addr
,
4836 ap
->ioaddr
.bmdma_addr
,
4840 host_set
->ops
->irq_clear(ap
);
4847 /* obtain irq, that is shared between channels */
4848 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4849 DRV_NAME
, host_set
))
4852 /* perform each probe synchronously */
4853 DPRINTK("probe begin\n");
4854 for (i
= 0; i
< count
; i
++) {
4855 struct ata_port
*ap
;
4858 ap
= host_set
->ports
[i
];
4860 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4861 rc
= ata_bus_probe(ap
);
4862 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4865 /* FIXME: do something useful here?
4866 * Current libata behavior will
4867 * tear down everything when
4868 * the module is removed
4869 * or the h/w is unplugged.
4873 rc
= scsi_add_host(ap
->host
, dev
);
4875 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4877 /* FIXME: do something useful here */
4878 /* FIXME: handle unconditional calls to
4879 * scsi_scan_host and ata_host_remove, below,
4885 /* probes are done, now scan each port's disk(s) */
4886 DPRINTK("host probe begin\n");
4887 for (i
= 0; i
< count
; i
++) {
4888 struct ata_port
*ap
= host_set
->ports
[i
];
4890 ata_scsi_scan_host(ap
);
4893 dev_set_drvdata(dev
, host_set
);
4895 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4896 return ent
->n_ports
; /* success */
4899 for (i
= 0; i
< count
; i
++) {
4900 ata_host_remove(host_set
->ports
[i
], 1);
4901 scsi_host_put(host_set
->ports
[i
]->host
);
4905 VPRINTK("EXIT, returning 0\n");
4910 * ata_host_set_remove - PCI layer callback for device removal
4911 * @host_set: ATA host set that was removed
4913 * Unregister all objects associated with this host set. Free those
4917 * Inherited from calling layer (may sleep).
4920 void ata_host_set_remove(struct ata_host_set
*host_set
)
4922 struct ata_port
*ap
;
4925 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4926 ap
= host_set
->ports
[i
];
4927 scsi_remove_host(ap
->host
);
4930 free_irq(host_set
->irq
, host_set
);
4932 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4933 ap
= host_set
->ports
[i
];
4935 ata_scsi_release(ap
->host
);
4937 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4938 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4940 if (ioaddr
->cmd_addr
== 0x1f0)
4941 release_region(0x1f0, 8);
4942 else if (ioaddr
->cmd_addr
== 0x170)
4943 release_region(0x170, 8);
4946 scsi_host_put(ap
->host
);
4949 if (host_set
->ops
->host_stop
)
4950 host_set
->ops
->host_stop(host_set
);
4956 * ata_scsi_release - SCSI layer callback hook for host unload
4957 * @host: libata host to be unloaded
4959 * Performs all duties necessary to shut down a libata port...
4960 * Kill port kthread, disable port, and release resources.
4963 * Inherited from SCSI layer.
4969 int ata_scsi_release(struct Scsi_Host
*host
)
4971 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4976 ap
->ops
->port_disable(ap
);
4977 ata_host_remove(ap
, 0);
4978 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4979 kfree(ap
->device
[i
].id
);
4986 * ata_std_ports - initialize ioaddr with standard port offsets.
4987 * @ioaddr: IO address structure to be initialized
4989 * Utility function which initializes data_addr, error_addr,
4990 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4991 * device_addr, status_addr, and command_addr to standard offsets
4992 * relative to cmd_addr.
4994 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4997 void ata_std_ports(struct ata_ioports
*ioaddr
)
4999 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5000 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5001 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5002 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5003 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5004 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5005 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5006 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5007 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5008 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5014 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5016 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5018 pci_iounmap(pdev
, host_set
->mmio_base
);
5022 * ata_pci_remove_one - PCI layer callback for device removal
5023 * @pdev: PCI device that was removed
5025 * PCI layer indicates to libata via this hook that
5026 * hot-unplug or module unload event has occurred.
5027 * Handle this by unregistering all objects associated
5028 * with this PCI device. Free those objects. Then finally
5029 * release PCI resources and disable device.
5032 * Inherited from PCI layer (may sleep).
5035 void ata_pci_remove_one (struct pci_dev
*pdev
)
5037 struct device
*dev
= pci_dev_to_dev(pdev
);
5038 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5040 ata_host_set_remove(host_set
);
5041 pci_release_regions(pdev
);
5042 pci_disable_device(pdev
);
5043 dev_set_drvdata(dev
, NULL
);
5046 /* move to PCI subsystem */
5047 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5049 unsigned long tmp
= 0;
5051 switch (bits
->width
) {
5054 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5060 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5066 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5077 return (tmp
== bits
->val
) ? 1 : 0;
5080 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5082 pci_save_state(pdev
);
5083 pci_disable_device(pdev
);
5084 pci_set_power_state(pdev
, PCI_D3hot
);
5088 int ata_pci_device_resume(struct pci_dev
*pdev
)
5090 pci_set_power_state(pdev
, PCI_D0
);
5091 pci_restore_state(pdev
);
5092 pci_enable_device(pdev
);
5093 pci_set_master(pdev
);
5096 #endif /* CONFIG_PCI */
5099 static int __init
ata_init(void)
5101 ata_wq
= create_workqueue("ata");
5105 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5109 static void __exit
ata_exit(void)
5111 destroy_workqueue(ata_wq
);
5114 module_init(ata_init
);
5115 module_exit(ata_exit
);
5117 static unsigned long ratelimit_time
;
5118 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5120 int ata_ratelimit(void)
5123 unsigned long flags
;
5125 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5127 if (time_after(jiffies
, ratelimit_time
)) {
5129 ratelimit_time
= jiffies
+ (HZ
/5);
5133 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5139 * libata is essentially a library of internal helper functions for
5140 * low-level ATA host controller drivers. As such, the API/ABI is
5141 * likely to change as new drivers are added and updated.
5142 * Do not depend on ABI/API stability.
5145 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5146 EXPORT_SYMBOL_GPL(ata_std_ports
);
5147 EXPORT_SYMBOL_GPL(ata_device_add
);
5148 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5149 EXPORT_SYMBOL_GPL(ata_sg_init
);
5150 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5151 EXPORT_SYMBOL_GPL(__ata_qc_complete
);
5152 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5153 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5154 EXPORT_SYMBOL_GPL(ata_tf_load
);
5155 EXPORT_SYMBOL_GPL(ata_tf_read
);
5156 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5157 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5158 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5159 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5160 EXPORT_SYMBOL_GPL(ata_check_status
);
5161 EXPORT_SYMBOL_GPL(ata_altstatus
);
5162 EXPORT_SYMBOL_GPL(ata_exec_command
);
5163 EXPORT_SYMBOL_GPL(ata_port_start
);
5164 EXPORT_SYMBOL_GPL(ata_port_stop
);
5165 EXPORT_SYMBOL_GPL(ata_host_stop
);
5166 EXPORT_SYMBOL_GPL(ata_interrupt
);
5167 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5168 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5169 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5170 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5171 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5172 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5173 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5174 EXPORT_SYMBOL_GPL(ata_port_probe
);
5175 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5176 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5177 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5178 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5179 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5180 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5181 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5182 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5183 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5184 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5185 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5186 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5187 EXPORT_SYMBOL_GPL(ata_port_disable
);
5188 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5189 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5190 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5191 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5192 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5193 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5194 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5195 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5196 EXPORT_SYMBOL_GPL(ata_host_intr
);
5197 EXPORT_SYMBOL_GPL(ata_id_string
);
5198 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5199 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5200 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5201 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);
5203 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5204 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5205 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5208 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5209 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5210 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5211 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5212 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5213 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5214 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5215 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5216 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5217 #endif /* CONFIG_PCI */
5219 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5220 EXPORT_SYMBOL_GPL(ata_device_resume
);
5221 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5222 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);