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_device
*dev
,
65 u16 heads
, u16 sectors
);
66 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
);
67 static void ata_dev_xfermask(struct ata_device
*dev
);
69 static unsigned int ata_unique_id
= 1;
70 static struct workqueue_struct
*ata_wq
;
72 int atapi_enabled
= 1;
73 module_param(atapi_enabled
, int, 0444);
74 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
77 module_param(atapi_dmadir
, int, 0444);
78 MODULE_PARM_DESC(atapi_dmadir
, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
81 module_param_named(fua
, libata_fua
, int, 0444);
82 MODULE_PARM_DESC(fua
, "FUA support (0=off, 1=on)");
84 MODULE_AUTHOR("Jeff Garzik");
85 MODULE_DESCRIPTION("Library module for ATA devices");
86 MODULE_LICENSE("GPL");
87 MODULE_VERSION(DRV_VERSION
);
91 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
92 * @tf: Taskfile to convert
93 * @fis: Buffer into which data will output
94 * @pmp: Port multiplier port
96 * Converts a standard ATA taskfile to a Serial ATA
97 * FIS structure (Register - Host to Device).
100 * Inherited from caller.
103 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
105 fis
[0] = 0x27; /* Register - Host to Device FIS */
106 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
107 bit 7 indicates Command FIS */
108 fis
[2] = tf
->command
;
109 fis
[3] = tf
->feature
;
116 fis
[8] = tf
->hob_lbal
;
117 fis
[9] = tf
->hob_lbam
;
118 fis
[10] = tf
->hob_lbah
;
119 fis
[11] = tf
->hob_feature
;
122 fis
[13] = tf
->hob_nsect
;
133 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
134 * @fis: Buffer from which data will be input
135 * @tf: Taskfile to output
137 * Converts a serial ATA FIS structure to a standard ATA taskfile.
140 * Inherited from caller.
143 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
145 tf
->command
= fis
[2]; /* status */
146 tf
->feature
= fis
[3]; /* error */
153 tf
->hob_lbal
= fis
[8];
154 tf
->hob_lbam
= fis
[9];
155 tf
->hob_lbah
= fis
[10];
158 tf
->hob_nsect
= fis
[13];
161 static const u8 ata_rw_cmds
[] = {
165 ATA_CMD_READ_MULTI_EXT
,
166 ATA_CMD_WRITE_MULTI_EXT
,
170 ATA_CMD_WRITE_MULTI_FUA_EXT
,
174 ATA_CMD_PIO_READ_EXT
,
175 ATA_CMD_PIO_WRITE_EXT
,
188 ATA_CMD_WRITE_FUA_EXT
192 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
193 * @qc: command to examine and configure
195 * Examine the device configuration and tf->flags to calculate
196 * the proper read/write commands and protocol to use.
201 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
203 struct ata_taskfile
*tf
= &qc
->tf
;
204 struct ata_device
*dev
= qc
->dev
;
207 int index
, fua
, lba48
, write
;
209 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
210 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
211 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
213 if (dev
->flags
& ATA_DFLAG_PIO
) {
214 tf
->protocol
= ATA_PROT_PIO
;
215 index
= dev
->multi_count
? 0 : 8;
216 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
217 /* Unable to use DMA due to host limitation */
218 tf
->protocol
= ATA_PROT_PIO
;
219 index
= dev
->multi_count
? 0 : 8;
221 tf
->protocol
= ATA_PROT_DMA
;
225 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
234 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
235 * @pio_mask: pio_mask
236 * @mwdma_mask: mwdma_mask
237 * @udma_mask: udma_mask
239 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
240 * unsigned int xfer_mask.
248 static unsigned int ata_pack_xfermask(unsigned int pio_mask
,
249 unsigned int mwdma_mask
,
250 unsigned int udma_mask
)
252 return ((pio_mask
<< ATA_SHIFT_PIO
) & ATA_MASK_PIO
) |
253 ((mwdma_mask
<< ATA_SHIFT_MWDMA
) & ATA_MASK_MWDMA
) |
254 ((udma_mask
<< ATA_SHIFT_UDMA
) & ATA_MASK_UDMA
);
258 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
259 * @xfer_mask: xfer_mask to unpack
260 * @pio_mask: resulting pio_mask
261 * @mwdma_mask: resulting mwdma_mask
262 * @udma_mask: resulting udma_mask
264 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
265 * Any NULL distination masks will be ignored.
267 static void ata_unpack_xfermask(unsigned int xfer_mask
,
268 unsigned int *pio_mask
,
269 unsigned int *mwdma_mask
,
270 unsigned int *udma_mask
)
273 *pio_mask
= (xfer_mask
& ATA_MASK_PIO
) >> ATA_SHIFT_PIO
;
275 *mwdma_mask
= (xfer_mask
& ATA_MASK_MWDMA
) >> ATA_SHIFT_MWDMA
;
277 *udma_mask
= (xfer_mask
& ATA_MASK_UDMA
) >> ATA_SHIFT_UDMA
;
280 static const struct ata_xfer_ent
{
284 { ATA_SHIFT_PIO
, ATA_BITS_PIO
, XFER_PIO_0
},
285 { ATA_SHIFT_MWDMA
, ATA_BITS_MWDMA
, XFER_MW_DMA_0
},
286 { ATA_SHIFT_UDMA
, ATA_BITS_UDMA
, XFER_UDMA_0
},
291 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
292 * @xfer_mask: xfer_mask of interest
294 * Return matching XFER_* value for @xfer_mask. Only the highest
295 * bit of @xfer_mask is considered.
301 * Matching XFER_* value, 0 if no match found.
303 static u8
ata_xfer_mask2mode(unsigned int xfer_mask
)
305 int highbit
= fls(xfer_mask
) - 1;
306 const struct ata_xfer_ent
*ent
;
308 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
309 if (highbit
>= ent
->shift
&& highbit
< ent
->shift
+ ent
->bits
)
310 return ent
->base
+ highbit
- ent
->shift
;
315 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
316 * @xfer_mode: XFER_* of interest
318 * Return matching xfer_mask for @xfer_mode.
324 * Matching xfer_mask, 0 if no match found.
326 static unsigned int ata_xfer_mode2mask(u8 xfer_mode
)
328 const struct ata_xfer_ent
*ent
;
330 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
331 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
332 return 1 << (ent
->shift
+ xfer_mode
- ent
->base
);
337 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
338 * @xfer_mode: XFER_* of interest
340 * Return matching xfer_shift for @xfer_mode.
346 * Matching xfer_shift, -1 if no match found.
348 static int ata_xfer_mode2shift(unsigned int xfer_mode
)
350 const struct ata_xfer_ent
*ent
;
352 for (ent
= ata_xfer_tbl
; ent
->shift
>= 0; ent
++)
353 if (xfer_mode
>= ent
->base
&& xfer_mode
< ent
->base
+ ent
->bits
)
359 * ata_mode_string - convert xfer_mask to string
360 * @xfer_mask: mask of bits supported; only highest bit counts.
362 * Determine string which represents the highest speed
363 * (highest bit in @modemask).
369 * Constant C string representing highest speed listed in
370 * @mode_mask, or the constant C string "<n/a>".
372 static const char *ata_mode_string(unsigned int xfer_mask
)
374 static const char * const xfer_mode_str
[] = {
394 highbit
= fls(xfer_mask
) - 1;
395 if (highbit
>= 0 && highbit
< ARRAY_SIZE(xfer_mode_str
))
396 return xfer_mode_str
[highbit
];
400 static const char *sata_spd_string(unsigned int spd
)
402 static const char * const spd_str
[] = {
407 if (spd
== 0 || (spd
- 1) >= ARRAY_SIZE(spd_str
))
409 return spd_str
[spd
- 1];
412 void ata_dev_disable(struct ata_device
*dev
)
414 if (ata_dev_enabled(dev
)) {
415 ata_dev_printk(dev
, KERN_WARNING
, "disabled\n");
421 * ata_pio_devchk - PATA device presence detection
422 * @ap: ATA channel to examine
423 * @device: Device to examine (starting at zero)
425 * This technique was originally described in
426 * Hale Landis's ATADRVR (www.ata-atapi.com), and
427 * later found its way into the ATA/ATAPI spec.
429 * Write a pattern to the ATA shadow registers,
430 * and if a device is present, it will respond by
431 * correctly storing and echoing back the
432 * ATA shadow register contents.
438 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
441 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
444 ap
->ops
->dev_select(ap
, device
);
446 outb(0x55, ioaddr
->nsect_addr
);
447 outb(0xaa, ioaddr
->lbal_addr
);
449 outb(0xaa, ioaddr
->nsect_addr
);
450 outb(0x55, ioaddr
->lbal_addr
);
452 outb(0x55, ioaddr
->nsect_addr
);
453 outb(0xaa, ioaddr
->lbal_addr
);
455 nsect
= inb(ioaddr
->nsect_addr
);
456 lbal
= inb(ioaddr
->lbal_addr
);
458 if ((nsect
== 0x55) && (lbal
== 0xaa))
459 return 1; /* we found a device */
461 return 0; /* nothing found */
465 * ata_mmio_devchk - PATA device presence detection
466 * @ap: ATA channel to examine
467 * @device: Device to examine (starting at zero)
469 * This technique was originally described in
470 * Hale Landis's ATADRVR (www.ata-atapi.com), and
471 * later found its way into the ATA/ATAPI spec.
473 * Write a pattern to the ATA shadow registers,
474 * and if a device is present, it will respond by
475 * correctly storing and echoing back the
476 * ATA shadow register contents.
482 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
485 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
488 ap
->ops
->dev_select(ap
, device
);
490 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
491 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
493 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
494 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
496 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
497 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
499 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
500 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
502 if ((nsect
== 0x55) && (lbal
== 0xaa))
503 return 1; /* we found a device */
505 return 0; /* nothing found */
509 * ata_devchk - PATA device presence detection
510 * @ap: ATA channel to examine
511 * @device: Device to examine (starting at zero)
513 * Dispatch ATA device presence detection, depending
514 * on whether we are using PIO or MMIO to talk to the
515 * ATA shadow registers.
521 static unsigned int ata_devchk(struct ata_port
*ap
,
524 if (ap
->flags
& ATA_FLAG_MMIO
)
525 return ata_mmio_devchk(ap
, device
);
526 return ata_pio_devchk(ap
, device
);
530 * ata_dev_classify - determine device type based on ATA-spec signature
531 * @tf: ATA taskfile register set for device to be identified
533 * Determine from taskfile register contents whether a device is
534 * ATA or ATAPI, as per "Signature and persistence" section
535 * of ATA/PI spec (volume 1, sect 5.14).
541 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
542 * the event of failure.
545 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
547 /* Apple's open source Darwin code hints that some devices only
548 * put a proper signature into the LBA mid/high registers,
549 * So, we only check those. It's sufficient for uniqueness.
552 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
553 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
554 DPRINTK("found ATA device by sig\n");
558 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
559 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
560 DPRINTK("found ATAPI device by sig\n");
561 return ATA_DEV_ATAPI
;
564 DPRINTK("unknown device\n");
565 return ATA_DEV_UNKNOWN
;
569 * ata_dev_try_classify - Parse returned ATA device signature
570 * @ap: ATA channel to examine
571 * @device: Device to examine (starting at zero)
572 * @r_err: Value of error register on completion
574 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
575 * an ATA/ATAPI-defined set of values is placed in the ATA
576 * shadow registers, indicating the results of device detection
579 * Select the ATA device, and read the values from the ATA shadow
580 * registers. Then parse according to the Error register value,
581 * and the spec-defined values examined by ata_dev_classify().
587 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
591 ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
, u8
*r_err
)
593 struct ata_taskfile tf
;
597 ap
->ops
->dev_select(ap
, device
);
599 memset(&tf
, 0, sizeof(tf
));
601 ap
->ops
->tf_read(ap
, &tf
);
606 /* see if device passed diags */
609 else if ((device
== 0) && (err
== 0x81))
614 /* determine if device is ATA or ATAPI */
615 class = ata_dev_classify(&tf
);
617 if (class == ATA_DEV_UNKNOWN
)
619 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
625 * ata_id_string - Convert IDENTIFY DEVICE page into string
626 * @id: IDENTIFY DEVICE results we will examine
627 * @s: string into which data is output
628 * @ofs: offset into identify device page
629 * @len: length of string to return. must be an even number.
631 * The strings in the IDENTIFY DEVICE page are broken up into
632 * 16-bit chunks. Run through the string, and output each
633 * 8-bit chunk linearly, regardless of platform.
639 void ata_id_string(const u16
*id
, unsigned char *s
,
640 unsigned int ofs
, unsigned int len
)
659 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
660 * @id: IDENTIFY DEVICE results we will examine
661 * @s: string into which data is output
662 * @ofs: offset into identify device page
663 * @len: length of string to return. must be an odd number.
665 * This function is identical to ata_id_string except that it
666 * trims trailing spaces and terminates the resulting string with
667 * null. @len must be actual maximum length (even number) + 1.
672 void ata_id_c_string(const u16
*id
, unsigned char *s
,
673 unsigned int ofs
, unsigned int len
)
679 ata_id_string(id
, s
, ofs
, len
- 1);
681 p
= s
+ strnlen(s
, len
- 1);
682 while (p
> s
&& p
[-1] == ' ')
687 static u64
ata_id_n_sectors(const u16
*id
)
689 if (ata_id_has_lba(id
)) {
690 if (ata_id_has_lba48(id
))
691 return ata_id_u64(id
, 100);
693 return ata_id_u32(id
, 60);
695 if (ata_id_current_chs_valid(id
))
696 return ata_id_u32(id
, 57);
698 return id
[1] * id
[3] * id
[6];
703 * ata_noop_dev_select - Select device 0/1 on ATA bus
704 * @ap: ATA channel to manipulate
705 * @device: ATA device (numbered from zero) to select
707 * This function performs no actual function.
709 * May be used as the dev_select() entry in ata_port_operations.
714 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
720 * ata_std_dev_select - Select device 0/1 on ATA bus
721 * @ap: ATA channel to manipulate
722 * @device: ATA device (numbered from zero) to select
724 * Use the method defined in the ATA specification to
725 * make either device 0, or device 1, active on the
726 * ATA channel. Works with both PIO and MMIO.
728 * May be used as the dev_select() entry in ata_port_operations.
734 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
739 tmp
= ATA_DEVICE_OBS
;
741 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
743 if (ap
->flags
& ATA_FLAG_MMIO
) {
744 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
746 outb(tmp
, ap
->ioaddr
.device_addr
);
748 ata_pause(ap
); /* needed; also flushes, for mmio */
752 * ata_dev_select - Select device 0/1 on ATA bus
753 * @ap: ATA channel to manipulate
754 * @device: ATA device (numbered from zero) to select
755 * @wait: non-zero to wait for Status register BSY bit to clear
756 * @can_sleep: non-zero if context allows sleeping
758 * Use the method defined in the ATA specification to
759 * make either device 0, or device 1, active on the
762 * This is a high-level version of ata_std_dev_select(),
763 * which additionally provides the services of inserting
764 * the proper pauses and status polling, where needed.
770 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
771 unsigned int wait
, unsigned int can_sleep
)
773 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
774 ap
->id
, device
, wait
);
779 ap
->ops
->dev_select(ap
, device
);
782 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
789 * ata_dump_id - IDENTIFY DEVICE info debugging output
790 * @id: IDENTIFY DEVICE page to dump
792 * Dump selected 16-bit words from the given IDENTIFY DEVICE
799 static inline void ata_dump_id(const u16
*id
)
801 DPRINTK("49==0x%04x "
811 DPRINTK("80==0x%04x "
821 DPRINTK("88==0x%04x "
828 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
829 * @id: IDENTIFY data to compute xfer mask from
831 * Compute the xfermask for this device. This is not as trivial
832 * as it seems if we must consider early devices correctly.
834 * FIXME: pre IDE drive timing (do we care ?).
842 static unsigned int ata_id_xfermask(const u16
*id
)
844 unsigned int pio_mask
, mwdma_mask
, udma_mask
;
846 /* Usual case. Word 53 indicates word 64 is valid */
847 if (id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
848 pio_mask
= id
[ATA_ID_PIO_MODES
] & 0x03;
852 /* If word 64 isn't valid then Word 51 high byte holds
853 * the PIO timing number for the maximum. Turn it into
856 pio_mask
= (2 << (id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
858 /* But wait.. there's more. Design your standards by
859 * committee and you too can get a free iordy field to
860 * process. However its the speeds not the modes that
861 * are supported... Note drivers using the timing API
862 * will get this right anyway
866 mwdma_mask
= id
[ATA_ID_MWDMA_MODES
] & 0x07;
869 if (id
[ATA_ID_FIELD_VALID
] & (1 << 2))
870 udma_mask
= id
[ATA_ID_UDMA_MODES
] & 0xff;
872 return ata_pack_xfermask(pio_mask
, mwdma_mask
, udma_mask
);
876 * ata_port_queue_task - Queue port_task
877 * @ap: The ata_port to queue port_task for
879 * Schedule @fn(@data) for execution after @delay jiffies using
880 * port_task. There is one port_task per port and it's the
881 * user(low level driver)'s responsibility to make sure that only
882 * one task is active at any given time.
884 * libata core layer takes care of synchronization between
885 * port_task and EH. ata_port_queue_task() may be ignored for EH
889 * Inherited from caller.
891 void ata_port_queue_task(struct ata_port
*ap
, void (*fn
)(void *), void *data
,
896 if (ap
->flags
& ATA_FLAG_FLUSH_PORT_TASK
)
899 PREPARE_WORK(&ap
->port_task
, fn
, data
);
902 rc
= queue_work(ata_wq
, &ap
->port_task
);
904 rc
= queue_delayed_work(ata_wq
, &ap
->port_task
, delay
);
906 /* rc == 0 means that another user is using port task */
911 * ata_port_flush_task - Flush port_task
912 * @ap: The ata_port to flush port_task for
914 * After this function completes, port_task is guranteed not to
915 * be running or scheduled.
918 * Kernel thread context (may sleep)
920 void ata_port_flush_task(struct ata_port
*ap
)
926 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
927 ap
->flags
|= ATA_FLAG_FLUSH_PORT_TASK
;
928 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
930 DPRINTK("flush #1\n");
931 flush_workqueue(ata_wq
);
934 * At this point, if a task is running, it's guaranteed to see
935 * the FLUSH flag; thus, it will never queue pio tasks again.
938 if (!cancel_delayed_work(&ap
->port_task
)) {
939 DPRINTK("flush #2\n");
940 flush_workqueue(ata_wq
);
943 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
944 ap
->flags
&= ~ATA_FLAG_FLUSH_PORT_TASK
;
945 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
950 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
952 struct completion
*waiting
= qc
->private_data
;
958 * ata_exec_internal - execute libata internal command
959 * @dev: Device to which the command is sent
960 * @tf: Taskfile registers for the command and the result
961 * @cdb: CDB for packet command
962 * @dma_dir: Data tranfer direction of the command
963 * @buf: Data buffer of the command
964 * @buflen: Length of data buffer
966 * Executes libata internal command with timeout. @tf contains
967 * command on entry and result on return. Timeout and error
968 * conditions are reported via return value. No recovery action
969 * is taken after a command times out. It's caller's duty to
970 * clean up after timeout.
973 * None. Should be called with kernel context, might sleep.
976 unsigned ata_exec_internal(struct ata_device
*dev
,
977 struct ata_taskfile
*tf
, const u8
*cdb
,
978 int dma_dir
, void *buf
, unsigned int buflen
)
980 struct ata_port
*ap
= dev
->ap
;
981 u8 command
= tf
->command
;
982 struct ata_queued_cmd
*qc
;
983 unsigned int tag
, preempted_tag
;
984 DECLARE_COMPLETION(wait
);
986 unsigned int err_mask
;
988 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
990 /* no internal command while frozen */
991 if (ap
->flags
& ATA_FLAG_FROZEN
) {
992 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
993 return AC_ERR_SYSTEM
;
996 /* initialize internal qc */
998 /* XXX: Tag 0 is used for drivers with legacy EH as some
999 * drivers choke if any other tag is given. This breaks
1000 * ata_tag_internal() test for those drivers. Don't use new
1001 * EH stuff without converting to it.
1003 if (ap
->ops
->error_handler
)
1004 tag
= ATA_TAG_INTERNAL
;
1008 if (test_and_set_bit(tag
, &ap
->qactive
))
1010 qc
= __ata_qc_from_tag(ap
, tag
);
1018 preempted_tag
= ap
->active_tag
;
1019 ap
->active_tag
= ATA_TAG_POISON
;
1021 /* prepare & issue qc */
1024 memcpy(qc
->cdb
, cdb
, ATAPI_CDB_LEN
);
1025 qc
->flags
|= ATA_QCFLAG_RESULT_TF
;
1026 qc
->dma_dir
= dma_dir
;
1027 if (dma_dir
!= DMA_NONE
) {
1028 ata_sg_init_one(qc
, buf
, buflen
);
1029 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1032 qc
->private_data
= &wait
;
1033 qc
->complete_fn
= ata_qc_complete_internal
;
1037 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1039 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1040 ata_port_flush_task(ap
);
1042 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1044 /* We're racing with irq here. If we lose, the
1045 * following test prevents us from completing the qc
1046 * again. If completion irq occurs after here but
1047 * before the caller cleans up, it will result in a
1048 * spurious interrupt. We can live with that.
1050 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1051 qc
->err_mask
= AC_ERR_TIMEOUT
;
1052 ata_qc_complete(qc
);
1054 ata_dev_printk(dev
, KERN_WARNING
,
1055 "qc timeout (cmd 0x%x)\n", command
);
1058 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1062 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1064 *tf
= qc
->result_tf
;
1065 err_mask
= qc
->err_mask
;
1068 ap
->active_tag
= preempted_tag
;
1070 /* XXX - Some LLDDs (sata_mv) disable port on command failure.
1071 * Until those drivers are fixed, we detect the condition
1072 * here, fail the command with AC_ERR_SYSTEM and reenable the
1075 * Note that this doesn't change any behavior as internal
1076 * command failure results in disabling the device in the
1077 * higher layer for LLDDs without new reset/EH callbacks.
1079 * Kill the following code as soon as those drivers are fixed.
1081 if (ap
->flags
& ATA_FLAG_DISABLED
) {
1082 err_mask
|= AC_ERR_SYSTEM
;
1086 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1092 * ata_pio_need_iordy - check if iordy needed
1095 * Check if the current speed of the device requires IORDY. Used
1096 * by various controllers for chip configuration.
1099 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1102 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1109 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1111 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1112 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1113 /* Is the speed faster than the drive allows non IORDY ? */
1115 /* This is cycle times not frequency - watch the logic! */
1116 if (pio
> 240) /* PIO2 is 240nS per cycle */
1125 * ata_dev_read_id - Read ID data from the specified device
1126 * @dev: target device
1127 * @p_class: pointer to class of the target device (may be changed)
1128 * @post_reset: is this read ID post-reset?
1129 * @id: buffer to read IDENTIFY data into
1131 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1132 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1133 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1134 * for pre-ATA4 drives.
1137 * Kernel thread context (may sleep)
1140 * 0 on success, -errno otherwise.
1142 static int ata_dev_read_id(struct ata_device
*dev
, unsigned int *p_class
,
1143 int post_reset
, u16
*id
)
1145 struct ata_port
*ap
= dev
->ap
;
1146 unsigned int class = *p_class
;
1147 struct ata_taskfile tf
;
1148 unsigned int err_mask
= 0;
1152 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1154 ata_dev_select(ap
, dev
->devno
, 1, 1); /* select device 0/1 */
1157 ata_tf_init(dev
, &tf
);
1161 tf
.command
= ATA_CMD_ID_ATA
;
1164 tf
.command
= ATA_CMD_ID_ATAPI
;
1168 reason
= "unsupported class";
1172 tf
.protocol
= ATA_PROT_PIO
;
1174 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1175 id
, sizeof(id
[0]) * ATA_ID_WORDS
);
1178 reason
= "I/O error";
1182 swap_buf_le16(id
, ATA_ID_WORDS
);
1185 if ((class == ATA_DEV_ATA
) != (ata_id_is_ata(id
) | ata_id_is_cfa(id
))) {
1187 reason
= "device reports illegal type";
1191 if (post_reset
&& class == ATA_DEV_ATA
) {
1193 * The exact sequence expected by certain pre-ATA4 drives is:
1196 * INITIALIZE DEVICE PARAMETERS
1198 * Some drives were very specific about that exact sequence.
1200 if (ata_id_major_version(id
) < 4 || !ata_id_has_lba(id
)) {
1201 err_mask
= ata_dev_init_params(dev
, id
[3], id
[6]);
1204 reason
= "INIT_DEV_PARAMS failed";
1208 /* current CHS translation info (id[53-58]) might be
1209 * changed. reread the identify device info.
1221 ata_dev_printk(dev
, KERN_WARNING
, "failed to IDENTIFY "
1222 "(%s, err_mask=0x%x)\n", reason
, err_mask
);
1226 static inline u8
ata_dev_knobble(struct ata_device
*dev
)
1228 return ((dev
->ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(dev
->id
)));
1232 * ata_dev_configure - Configure the specified ATA/ATAPI device
1233 * @dev: Target device to configure
1234 * @print_info: Enable device info printout
1236 * Configure @dev according to @dev->id. Generic and low-level
1237 * driver specific fixups are also applied.
1240 * Kernel thread context (may sleep)
1243 * 0 on success, -errno otherwise
1245 static int ata_dev_configure(struct ata_device
*dev
, int print_info
)
1247 struct ata_port
*ap
= dev
->ap
;
1248 const u16
*id
= dev
->id
;
1249 unsigned int xfer_mask
;
1252 if (!ata_dev_enabled(dev
)) {
1253 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1254 ap
->id
, dev
->devno
);
1258 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, dev
->devno
);
1260 /* print device capabilities */
1262 ata_dev_printk(dev
, KERN_DEBUG
, "cfg 49:%04x 82:%04x 83:%04x "
1263 "84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1264 id
[49], id
[82], id
[83], id
[84],
1265 id
[85], id
[86], id
[87], id
[88]);
1267 /* initialize to-be-configured parameters */
1268 dev
->flags
&= ~ATA_DFLAG_CFG_MASK
;
1269 dev
->max_sectors
= 0;
1277 * common ATA, ATAPI feature tests
1280 /* find max transfer mode; for printk only */
1281 xfer_mask
= ata_id_xfermask(id
);
1285 /* ATA-specific feature tests */
1286 if (dev
->class == ATA_DEV_ATA
) {
1287 dev
->n_sectors
= ata_id_n_sectors(id
);
1289 if (ata_id_has_lba(id
)) {
1290 const char *lba_desc
;
1293 dev
->flags
|= ATA_DFLAG_LBA
;
1294 if (ata_id_has_lba48(id
)) {
1295 dev
->flags
|= ATA_DFLAG_LBA48
;
1299 /* print device info to dmesg */
1301 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1302 "max %s, %Lu sectors: %s\n",
1303 ata_id_major_version(id
),
1304 ata_mode_string(xfer_mask
),
1305 (unsigned long long)dev
->n_sectors
,
1310 /* Default translation */
1311 dev
->cylinders
= id
[1];
1313 dev
->sectors
= id
[6];
1315 if (ata_id_current_chs_valid(id
)) {
1316 /* Current CHS translation is valid. */
1317 dev
->cylinders
= id
[54];
1318 dev
->heads
= id
[55];
1319 dev
->sectors
= id
[56];
1322 /* print device info to dmesg */
1324 ata_dev_printk(dev
, KERN_INFO
, "ATA-%d, "
1325 "max %s, %Lu sectors: CHS %u/%u/%u\n",
1326 ata_id_major_version(id
),
1327 ata_mode_string(xfer_mask
),
1328 (unsigned long long)dev
->n_sectors
,
1329 dev
->cylinders
, dev
->heads
, dev
->sectors
);
1335 /* ATAPI-specific feature tests */
1336 else if (dev
->class == ATA_DEV_ATAPI
) {
1337 rc
= atapi_cdb_len(id
);
1338 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1339 ata_dev_printk(dev
, KERN_WARNING
,
1340 "unsupported CDB len\n");
1344 dev
->cdb_len
= (unsigned int) rc
;
1346 /* print device info to dmesg */
1348 ata_dev_printk(dev
, KERN_INFO
, "ATAPI, max %s\n",
1349 ata_mode_string(xfer_mask
));
1352 ap
->host
->max_cmd_len
= 0;
1353 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1354 ap
->host
->max_cmd_len
= max_t(unsigned int,
1355 ap
->host
->max_cmd_len
,
1356 ap
->device
[i
].cdb_len
);
1358 /* limit bridge transfers to udma5, 200 sectors */
1359 if (ata_dev_knobble(dev
)) {
1361 ata_dev_printk(dev
, KERN_INFO
,
1362 "applying bridge limits\n");
1363 dev
->udma_mask
&= ATA_UDMA5
;
1364 dev
->max_sectors
= ATA_MAX_SECTORS
;
1367 if (ap
->ops
->dev_config
)
1368 ap
->ops
->dev_config(ap
, dev
);
1370 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1374 DPRINTK("EXIT, err\n");
1379 * ata_bus_probe - Reset and probe ATA bus
1382 * Master ATA bus probing function. Initiates a hardware-dependent
1383 * bus reset, then attempts to identify any devices found on
1387 * PCI/etc. bus probe sem.
1390 * Zero on success, negative errno otherwise.
1393 static int ata_bus_probe(struct ata_port
*ap
)
1395 unsigned int classes
[ATA_MAX_DEVICES
];
1396 int tries
[ATA_MAX_DEVICES
];
1397 int i
, rc
, down_xfermask
;
1398 struct ata_device
*dev
;
1402 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1403 tries
[i
] = ATA_PROBE_MAX_TRIES
;
1408 /* reset and determine device classes */
1409 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1410 classes
[i
] = ATA_DEV_UNKNOWN
;
1412 if (ap
->ops
->probe_reset
) {
1413 rc
= ap
->ops
->probe_reset(ap
, classes
);
1415 ata_port_printk(ap
, KERN_ERR
,
1416 "reset failed (errno=%d)\n", rc
);
1420 ap
->ops
->phy_reset(ap
);
1422 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1423 if (!(ap
->flags
& ATA_FLAG_DISABLED
))
1424 classes
[i
] = ap
->device
[i
].class;
1425 ap
->device
[i
].class = ATA_DEV_UNKNOWN
;
1431 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1432 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1433 classes
[i
] = ATA_DEV_NONE
;
1435 /* read IDENTIFY page and configure devices */
1436 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1437 dev
= &ap
->device
[i
];
1440 dev
->class = classes
[i
];
1442 if (!ata_dev_enabled(dev
))
1445 rc
= ata_dev_read_id(dev
, &dev
->class, 1, dev
->id
);
1449 rc
= ata_dev_configure(dev
, 1);
1454 /* configure transfer mode */
1455 rc
= ata_set_mode(ap
, &dev
);
1461 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1462 if (ata_dev_enabled(&ap
->device
[i
]))
1465 /* no device present, disable port */
1466 ata_port_disable(ap
);
1467 ap
->ops
->port_disable(ap
);
1474 tries
[dev
->devno
] = 0;
1477 sata_down_spd_limit(ap
);
1480 tries
[dev
->devno
]--;
1481 if (down_xfermask
&&
1482 ata_down_xfermask_limit(dev
, tries
[dev
->devno
] == 1))
1483 tries
[dev
->devno
] = 0;
1486 if (!tries
[dev
->devno
]) {
1487 ata_down_xfermask_limit(dev
, 1);
1488 ata_dev_disable(dev
);
1495 * ata_port_probe - Mark port as enabled
1496 * @ap: Port for which we indicate enablement
1498 * Modify @ap data structure such that the system
1499 * thinks that the entire port is enabled.
1501 * LOCKING: host_set lock, or some other form of
1505 void ata_port_probe(struct ata_port
*ap
)
1507 ap
->flags
&= ~ATA_FLAG_DISABLED
;
1511 * sata_print_link_status - Print SATA link status
1512 * @ap: SATA port to printk link status about
1514 * This function prints link speed and status of a SATA link.
1519 static void sata_print_link_status(struct ata_port
*ap
)
1521 u32 sstatus
, scontrol
, tmp
;
1523 if (sata_scr_read(ap
, SCR_STATUS
, &sstatus
))
1525 sata_scr_read(ap
, SCR_CONTROL
, &scontrol
);
1527 if (ata_port_online(ap
)) {
1528 tmp
= (sstatus
>> 4) & 0xf;
1529 ata_port_printk(ap
, KERN_INFO
,
1530 "SATA link up %s (SStatus %X SControl %X)\n",
1531 sata_spd_string(tmp
), sstatus
, scontrol
);
1533 ata_port_printk(ap
, KERN_INFO
,
1534 "SATA link down (SStatus %X SControl %X)\n",
1540 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1541 * @ap: SATA port associated with target SATA PHY.
1543 * This function issues commands to standard SATA Sxxx
1544 * PHY registers, to wake up the phy (and device), and
1545 * clear any reset condition.
1548 * PCI/etc. bus probe sem.
1551 void __sata_phy_reset(struct ata_port
*ap
)
1554 unsigned long timeout
= jiffies
+ (HZ
* 5);
1556 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1557 /* issue phy wake/reset */
1558 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1559 /* Couldn't find anything in SATA I/II specs, but
1560 * AHCI-1.1 10.4.2 says at least 1 ms. */
1563 /* phy wake/clear reset */
1564 sata_scr_write_flush(ap
, SCR_CONTROL
, 0x300);
1566 /* wait for phy to become ready, if necessary */
1569 sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1570 if ((sstatus
& 0xf) != 1)
1572 } while (time_before(jiffies
, timeout
));
1574 /* print link status */
1575 sata_print_link_status(ap
);
1577 /* TODO: phy layer with polling, timeouts, etc. */
1578 if (!ata_port_offline(ap
))
1581 ata_port_disable(ap
);
1583 if (ap
->flags
& ATA_FLAG_DISABLED
)
1586 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1587 ata_port_disable(ap
);
1591 ap
->cbl
= ATA_CBL_SATA
;
1595 * sata_phy_reset - Reset SATA bus.
1596 * @ap: SATA port associated with target SATA PHY.
1598 * This function resets the SATA bus, and then probes
1599 * the bus for devices.
1602 * PCI/etc. bus probe sem.
1605 void sata_phy_reset(struct ata_port
*ap
)
1607 __sata_phy_reset(ap
);
1608 if (ap
->flags
& ATA_FLAG_DISABLED
)
1614 * ata_dev_pair - return other device on cable
1617 * Obtain the other device on the same cable, or if none is
1618 * present NULL is returned
1621 struct ata_device
*ata_dev_pair(struct ata_device
*adev
)
1623 struct ata_port
*ap
= adev
->ap
;
1624 struct ata_device
*pair
= &ap
->device
[1 - adev
->devno
];
1625 if (!ata_dev_enabled(pair
))
1631 * ata_port_disable - Disable port.
1632 * @ap: Port to be disabled.
1634 * Modify @ap data structure such that the system
1635 * thinks that the entire port is disabled, and should
1636 * never attempt to probe or communicate with devices
1639 * LOCKING: host_set lock, or some other form of
1643 void ata_port_disable(struct ata_port
*ap
)
1645 ap
->device
[0].class = ATA_DEV_NONE
;
1646 ap
->device
[1].class = ATA_DEV_NONE
;
1647 ap
->flags
|= ATA_FLAG_DISABLED
;
1651 * sata_down_spd_limit - adjust SATA spd limit downward
1652 * @ap: Port to adjust SATA spd limit for
1654 * Adjust SATA spd limit of @ap downward. Note that this
1655 * function only adjusts the limit. The change must be applied
1656 * using sata_set_spd().
1659 * Inherited from caller.
1662 * 0 on success, negative errno on failure
1664 int sata_down_spd_limit(struct ata_port
*ap
)
1666 u32 sstatus
, spd
, mask
;
1669 rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
);
1673 mask
= ap
->sata_spd_limit
;
1676 highbit
= fls(mask
) - 1;
1677 mask
&= ~(1 << highbit
);
1679 spd
= (sstatus
>> 4) & 0xf;
1683 mask
&= (1 << spd
) - 1;
1687 ap
->sata_spd_limit
= mask
;
1689 ata_port_printk(ap
, KERN_WARNING
, "limiting SATA link speed to %s\n",
1690 sata_spd_string(fls(mask
)));
1695 static int __sata_set_spd_needed(struct ata_port
*ap
, u32
*scontrol
)
1699 if (ap
->sata_spd_limit
== UINT_MAX
)
1702 limit
= fls(ap
->sata_spd_limit
);
1704 spd
= (*scontrol
>> 4) & 0xf;
1705 *scontrol
= (*scontrol
& ~0xf0) | ((limit
& 0xf) << 4);
1707 return spd
!= limit
;
1711 * sata_set_spd_needed - is SATA spd configuration needed
1712 * @ap: Port in question
1714 * Test whether the spd limit in SControl matches
1715 * @ap->sata_spd_limit. This function is used to determine
1716 * whether hardreset is necessary to apply SATA spd
1720 * Inherited from caller.
1723 * 1 if SATA spd configuration is needed, 0 otherwise.
1725 int sata_set_spd_needed(struct ata_port
*ap
)
1729 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
))
1732 return __sata_set_spd_needed(ap
, &scontrol
);
1736 * sata_set_spd - set SATA spd according to spd limit
1737 * @ap: Port to set SATA spd for
1739 * Set SATA spd of @ap according to sata_spd_limit.
1742 * Inherited from caller.
1745 * 0 if spd doesn't need to be changed, 1 if spd has been
1746 * changed. Negative errno if SCR registers are inaccessible.
1748 int sata_set_spd(struct ata_port
*ap
)
1753 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
1756 if (!__sata_set_spd_needed(ap
, &scontrol
))
1759 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
1766 * This mode timing computation functionality is ported over from
1767 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1770 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1771 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1772 * for PIO 5, which is a nonstandard extension and UDMA6, which
1773 * is currently supported only by Maxtor drives.
1776 static const struct ata_timing ata_timing
[] = {
1778 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1779 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1780 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1781 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1783 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1784 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1785 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1787 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1789 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1790 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1791 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1793 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1794 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1795 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1797 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1798 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1799 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1801 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1802 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1803 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1805 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1810 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1811 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1813 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1815 q
->setup
= EZ(t
->setup
* 1000, T
);
1816 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1817 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1818 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1819 q
->active
= EZ(t
->active
* 1000, T
);
1820 q
->recover
= EZ(t
->recover
* 1000, T
);
1821 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1822 q
->udma
= EZ(t
->udma
* 1000, UT
);
1825 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1826 struct ata_timing
*m
, unsigned int what
)
1828 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1829 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1830 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1831 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1832 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1833 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1834 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1835 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1838 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1840 const struct ata_timing
*t
;
1842 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1843 if (t
->mode
== 0xFF)
1848 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1849 struct ata_timing
*t
, int T
, int UT
)
1851 const struct ata_timing
*s
;
1852 struct ata_timing p
;
1858 if (!(s
= ata_timing_find_mode(speed
)))
1861 memcpy(t
, s
, sizeof(*s
));
1864 * If the drive is an EIDE drive, it can tell us it needs extended
1865 * PIO/MW_DMA cycle timing.
1868 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1869 memset(&p
, 0, sizeof(p
));
1870 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1871 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1872 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1873 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1874 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1876 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1880 * Convert the timing to bus clock counts.
1883 ata_timing_quantize(t
, t
, T
, UT
);
1886 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1887 * S.M.A.R.T * and some other commands. We have to ensure that the
1888 * DMA cycle timing is slower/equal than the fastest PIO timing.
1891 if (speed
> XFER_PIO_4
) {
1892 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1893 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1897 * Lengthen active & recovery time so that cycle time is correct.
1900 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1901 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1902 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1905 if (t
->active
+ t
->recover
< t
->cycle
) {
1906 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1907 t
->recover
= t
->cycle
- t
->active
;
1914 * ata_down_xfermask_limit - adjust dev xfer masks downward
1915 * @dev: Device to adjust xfer masks
1916 * @force_pio0: Force PIO0
1918 * Adjust xfer masks of @dev downward. Note that this function
1919 * does not apply the change. Invoking ata_set_mode() afterwards
1920 * will apply the limit.
1923 * Inherited from caller.
1926 * 0 on success, negative errno on failure
1928 int ata_down_xfermask_limit(struct ata_device
*dev
, int force_pio0
)
1930 unsigned long xfer_mask
;
1933 xfer_mask
= ata_pack_xfermask(dev
->pio_mask
, dev
->mwdma_mask
,
1938 /* don't gear down to MWDMA from UDMA, go directly to PIO */
1939 if (xfer_mask
& ATA_MASK_UDMA
)
1940 xfer_mask
&= ~ATA_MASK_MWDMA
;
1942 highbit
= fls(xfer_mask
) - 1;
1943 xfer_mask
&= ~(1 << highbit
);
1945 xfer_mask
&= 1 << ATA_SHIFT_PIO
;
1949 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
, &dev
->mwdma_mask
,
1952 ata_dev_printk(dev
, KERN_WARNING
, "limiting speed to %s\n",
1953 ata_mode_string(xfer_mask
));
1961 static int ata_dev_set_mode(struct ata_device
*dev
)
1963 unsigned int err_mask
;
1966 dev
->flags
&= ~ATA_DFLAG_PIO
;
1967 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1968 dev
->flags
|= ATA_DFLAG_PIO
;
1970 err_mask
= ata_dev_set_xfermode(dev
);
1972 ata_dev_printk(dev
, KERN_ERR
, "failed to set xfermode "
1973 "(err_mask=0x%x)\n", err_mask
);
1977 rc
= ata_dev_revalidate(dev
, 0);
1981 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
1982 dev
->xfer_shift
, (int)dev
->xfer_mode
);
1984 ata_dev_printk(dev
, KERN_INFO
, "configured for %s\n",
1985 ata_mode_string(ata_xfer_mode2mask(dev
->xfer_mode
)));
1990 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1991 * @ap: port on which timings will be programmed
1992 * @r_failed_dev: out paramter for failed device
1994 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
1995 * ata_set_mode() fails, pointer to the failing device is
1996 * returned in @r_failed_dev.
1999 * PCI/etc. bus probe sem.
2002 * 0 on success, negative errno otherwise
2004 int ata_set_mode(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
2006 struct ata_device
*dev
;
2007 int i
, rc
= 0, used_dma
= 0, found
= 0;
2009 /* has private set_mode? */
2010 if (ap
->ops
->set_mode
) {
2011 /* FIXME: make ->set_mode handle no device case and
2012 * return error code and failing device on failure.
2014 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2015 if (ata_dev_enabled(&ap
->device
[i
])) {
2016 ap
->ops
->set_mode(ap
);
2023 /* step 1: calculate xfer_mask */
2024 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2025 unsigned int pio_mask
, dma_mask
;
2027 dev
= &ap
->device
[i
];
2029 if (!ata_dev_enabled(dev
))
2032 ata_dev_xfermask(dev
);
2034 pio_mask
= ata_pack_xfermask(dev
->pio_mask
, 0, 0);
2035 dma_mask
= ata_pack_xfermask(0, dev
->mwdma_mask
, dev
->udma_mask
);
2036 dev
->pio_mode
= ata_xfer_mask2mode(pio_mask
);
2037 dev
->dma_mode
= ata_xfer_mask2mode(dma_mask
);
2046 /* step 2: always set host PIO timings */
2047 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2048 dev
= &ap
->device
[i
];
2049 if (!ata_dev_enabled(dev
))
2052 if (!dev
->pio_mode
) {
2053 ata_dev_printk(dev
, KERN_WARNING
, "no PIO support\n");
2058 dev
->xfer_mode
= dev
->pio_mode
;
2059 dev
->xfer_shift
= ATA_SHIFT_PIO
;
2060 if (ap
->ops
->set_piomode
)
2061 ap
->ops
->set_piomode(ap
, dev
);
2064 /* step 3: set host DMA timings */
2065 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2066 dev
= &ap
->device
[i
];
2068 if (!ata_dev_enabled(dev
) || !dev
->dma_mode
)
2071 dev
->xfer_mode
= dev
->dma_mode
;
2072 dev
->xfer_shift
= ata_xfer_mode2shift(dev
->dma_mode
);
2073 if (ap
->ops
->set_dmamode
)
2074 ap
->ops
->set_dmamode(ap
, dev
);
2077 /* step 4: update devices' xfer mode */
2078 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2079 dev
= &ap
->device
[i
];
2081 if (!ata_dev_enabled(dev
))
2084 rc
= ata_dev_set_mode(dev
);
2089 /* Record simplex status. If we selected DMA then the other
2090 * host channels are not permitted to do so.
2092 if (used_dma
&& (ap
->host_set
->flags
& ATA_HOST_SIMPLEX
))
2093 ap
->host_set
->simplex_claimed
= 1;
2095 /* step5: chip specific finalisation */
2096 if (ap
->ops
->post_set_mode
)
2097 ap
->ops
->post_set_mode(ap
);
2101 *r_failed_dev
= dev
;
2106 * ata_tf_to_host - issue ATA taskfile to host controller
2107 * @ap: port to which command is being issued
2108 * @tf: ATA taskfile register set
2110 * Issues ATA taskfile register set to ATA host controller,
2111 * with proper synchronization with interrupt handler and
2115 * spin_lock_irqsave(host_set lock)
2118 static inline void ata_tf_to_host(struct ata_port
*ap
,
2119 const struct ata_taskfile
*tf
)
2121 ap
->ops
->tf_load(ap
, tf
);
2122 ap
->ops
->exec_command(ap
, tf
);
2126 * ata_busy_sleep - sleep until BSY clears, or timeout
2127 * @ap: port containing status register to be polled
2128 * @tmout_pat: impatience timeout
2129 * @tmout: overall timeout
2131 * Sleep until ATA Status register bit BSY clears,
2132 * or a timeout occurs.
2137 unsigned int ata_busy_sleep (struct ata_port
*ap
,
2138 unsigned long tmout_pat
, unsigned long tmout
)
2140 unsigned long timer_start
, timeout
;
2143 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
2144 timer_start
= jiffies
;
2145 timeout
= timer_start
+ tmout_pat
;
2146 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2148 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
2151 if (status
& ATA_BUSY
)
2152 ata_port_printk(ap
, KERN_WARNING
,
2153 "port is slow to respond, please be patient\n");
2155 timeout
= timer_start
+ tmout
;
2156 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
2158 status
= ata_chk_status(ap
);
2161 if (status
& ATA_BUSY
) {
2162 ata_port_printk(ap
, KERN_ERR
, "port failed to respond "
2163 "(%lu secs)\n", tmout
/ HZ
);
2170 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
2172 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2173 unsigned int dev0
= devmask
& (1 << 0);
2174 unsigned int dev1
= devmask
& (1 << 1);
2175 unsigned long timeout
;
2177 /* if device 0 was found in ata_devchk, wait for its
2181 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2183 /* if device 1 was found in ata_devchk, wait for
2184 * register access, then wait for BSY to clear
2186 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2190 ap
->ops
->dev_select(ap
, 1);
2191 if (ap
->flags
& ATA_FLAG_MMIO
) {
2192 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2193 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2195 nsect
= inb(ioaddr
->nsect_addr
);
2196 lbal
= inb(ioaddr
->lbal_addr
);
2198 if ((nsect
== 1) && (lbal
== 1))
2200 if (time_after(jiffies
, timeout
)) {
2204 msleep(50); /* give drive a breather */
2207 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2209 /* is all this really necessary? */
2210 ap
->ops
->dev_select(ap
, 0);
2212 ap
->ops
->dev_select(ap
, 1);
2214 ap
->ops
->dev_select(ap
, 0);
2217 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2218 unsigned int devmask
)
2220 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2222 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2224 /* software reset. causes dev0 to be selected */
2225 if (ap
->flags
& ATA_FLAG_MMIO
) {
2226 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2227 udelay(20); /* FIXME: flush */
2228 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2229 udelay(20); /* FIXME: flush */
2230 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2232 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2234 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2236 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2239 /* spec mandates ">= 2ms" before checking status.
2240 * We wait 150ms, because that was the magic delay used for
2241 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2242 * between when the ATA command register is written, and then
2243 * status is checked. Because waiting for "a while" before
2244 * checking status is fine, post SRST, we perform this magic
2245 * delay here as well.
2247 * Old drivers/ide uses the 2mS rule and then waits for ready
2251 /* Before we perform post reset processing we want to see if
2252 * the bus shows 0xFF because the odd clown forgets the D7
2253 * pulldown resistor.
2255 if (ata_check_status(ap
) == 0xFF) {
2256 ata_port_printk(ap
, KERN_ERR
, "SRST failed (status 0xFF)\n");
2257 return AC_ERR_OTHER
;
2260 ata_bus_post_reset(ap
, devmask
);
2266 * ata_bus_reset - reset host port and associated ATA channel
2267 * @ap: port to reset
2269 * This is typically the first time we actually start issuing
2270 * commands to the ATA channel. We wait for BSY to clear, then
2271 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2272 * result. Determine what devices, if any, are on the channel
2273 * by looking at the device 0/1 error register. Look at the signature
2274 * stored in each device's taskfile registers, to determine if
2275 * the device is ATA or ATAPI.
2278 * PCI/etc. bus probe sem.
2279 * Obtains host_set lock.
2282 * Sets ATA_FLAG_DISABLED if bus reset fails.
2285 void ata_bus_reset(struct ata_port
*ap
)
2287 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2288 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2290 unsigned int dev0
, dev1
= 0, devmask
= 0;
2292 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2294 /* determine if device 0/1 are present */
2295 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2298 dev0
= ata_devchk(ap
, 0);
2300 dev1
= ata_devchk(ap
, 1);
2304 devmask
|= (1 << 0);
2306 devmask
|= (1 << 1);
2308 /* select device 0 again */
2309 ap
->ops
->dev_select(ap
, 0);
2311 /* issue bus reset */
2312 if (ap
->flags
& ATA_FLAG_SRST
)
2313 if (ata_bus_softreset(ap
, devmask
))
2317 * determine by signature whether we have ATA or ATAPI devices
2319 ap
->device
[0].class = ata_dev_try_classify(ap
, 0, &err
);
2320 if ((slave_possible
) && (err
!= 0x81))
2321 ap
->device
[1].class = ata_dev_try_classify(ap
, 1, &err
);
2323 /* re-enable interrupts */
2324 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2327 /* is double-select really necessary? */
2328 if (ap
->device
[1].class != ATA_DEV_NONE
)
2329 ap
->ops
->dev_select(ap
, 1);
2330 if (ap
->device
[0].class != ATA_DEV_NONE
)
2331 ap
->ops
->dev_select(ap
, 0);
2333 /* if no devices were detected, disable this port */
2334 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2335 (ap
->device
[1].class == ATA_DEV_NONE
))
2338 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2339 /* set up device control for ATA_FLAG_SATA_RESET */
2340 if (ap
->flags
& ATA_FLAG_MMIO
)
2341 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2343 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2350 ata_port_printk(ap
, KERN_ERR
, "disabling port\n");
2351 ap
->ops
->port_disable(ap
);
2356 static int sata_phy_resume(struct ata_port
*ap
)
2358 unsigned long timeout
= jiffies
+ (HZ
* 5);
2359 u32 scontrol
, sstatus
;
2362 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2365 scontrol
= (scontrol
& 0x0f0) | 0x300;
2367 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2370 /* Wait for phy to become ready, if necessary. */
2373 if ((rc
= sata_scr_read(ap
, SCR_STATUS
, &sstatus
)))
2375 if ((sstatus
& 0xf) != 1)
2377 } while (time_before(jiffies
, timeout
));
2383 * ata_std_probeinit - initialize probing
2384 * @ap: port to be probed
2386 * @ap is about to be probed. Initialize it. This function is
2387 * to be used as standard callback for ata_drive_probe_reset().
2389 * NOTE!!! Do not use this function as probeinit if a low level
2390 * driver implements only hardreset. Just pass NULL as probeinit
2391 * in that case. Using this function is probably okay but doing
2392 * so makes reset sequence different from the original
2393 * ->phy_reset implementation and Jeff nervous. :-P
2395 void ata_std_probeinit(struct ata_port
*ap
)
2400 sata_phy_resume(ap
);
2402 /* init sata_spd_limit to the current value */
2403 if (sata_scr_read(ap
, SCR_CONTROL
, &scontrol
) == 0) {
2404 int spd
= (scontrol
>> 4) & 0xf;
2405 ap
->sata_spd_limit
&= (1 << spd
) - 1;
2408 /* wait for device */
2409 if (ata_port_online(ap
))
2410 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2414 * ata_std_softreset - reset host port via ATA SRST
2415 * @ap: port to reset
2416 * @classes: resulting classes of attached devices
2418 * Reset host port using ATA SRST. This function is to be used
2419 * as standard callback for ata_drive_*_reset() functions.
2422 * Kernel thread context (may sleep)
2425 * 0 on success, -errno otherwise.
2427 int ata_std_softreset(struct ata_port
*ap
, unsigned int *classes
)
2429 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2430 unsigned int devmask
= 0, err_mask
;
2435 if (ata_port_offline(ap
)) {
2436 classes
[0] = ATA_DEV_NONE
;
2440 /* determine if device 0/1 are present */
2441 if (ata_devchk(ap
, 0))
2442 devmask
|= (1 << 0);
2443 if (slave_possible
&& ata_devchk(ap
, 1))
2444 devmask
|= (1 << 1);
2446 /* select device 0 again */
2447 ap
->ops
->dev_select(ap
, 0);
2449 /* issue bus reset */
2450 DPRINTK("about to softreset, devmask=%x\n", devmask
);
2451 err_mask
= ata_bus_softreset(ap
, devmask
);
2453 ata_port_printk(ap
, KERN_ERR
, "SRST failed (err_mask=0x%x)\n",
2458 /* determine by signature whether we have ATA or ATAPI devices */
2459 classes
[0] = ata_dev_try_classify(ap
, 0, &err
);
2460 if (slave_possible
&& err
!= 0x81)
2461 classes
[1] = ata_dev_try_classify(ap
, 1, &err
);
2464 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes
[0], classes
[1]);
2469 * sata_std_hardreset - reset host port via SATA phy reset
2470 * @ap: port to reset
2471 * @class: resulting class of attached device
2473 * SATA phy-reset host port using DET bits of SControl register.
2474 * This function is to be used as standard callback for
2475 * ata_drive_*_reset().
2478 * Kernel thread context (may sleep)
2481 * 0 on success, -errno otherwise.
2483 int sata_std_hardreset(struct ata_port
*ap
, unsigned int *class)
2490 if (sata_set_spd_needed(ap
)) {
2491 /* SATA spec says nothing about how to reconfigure
2492 * spd. To be on the safe side, turn off phy during
2493 * reconfiguration. This works for at least ICH7 AHCI
2496 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2499 scontrol
= (scontrol
& 0x0f0) | 0x302;
2501 if ((rc
= sata_scr_write(ap
, SCR_CONTROL
, scontrol
)))
2507 /* issue phy wake/reset */
2508 if ((rc
= sata_scr_read(ap
, SCR_CONTROL
, &scontrol
)))
2511 scontrol
= (scontrol
& 0x0f0) | 0x301;
2513 if ((rc
= sata_scr_write_flush(ap
, SCR_CONTROL
, scontrol
)))
2516 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2517 * 10.4.2 says at least 1 ms.
2521 /* bring phy back */
2522 sata_phy_resume(ap
);
2524 /* TODO: phy layer with polling, timeouts, etc. */
2525 if (ata_port_offline(ap
)) {
2526 *class = ATA_DEV_NONE
;
2527 DPRINTK("EXIT, link offline\n");
2531 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
2532 ata_port_printk(ap
, KERN_ERR
,
2533 "COMRESET failed (device not ready)\n");
2537 ap
->ops
->dev_select(ap
, 0); /* probably unnecessary */
2539 *class = ata_dev_try_classify(ap
, 0, NULL
);
2541 DPRINTK("EXIT, class=%u\n", *class);
2546 * ata_std_postreset - standard postreset callback
2547 * @ap: the target ata_port
2548 * @classes: classes of attached devices
2550 * This function is invoked after a successful reset. Note that
2551 * the device might have been reset more than once using
2552 * different reset methods before postreset is invoked.
2554 * This function is to be used as standard callback for
2555 * ata_drive_*_reset().
2558 * Kernel thread context (may sleep)
2560 void ata_std_postreset(struct ata_port
*ap
, unsigned int *classes
)
2566 /* print link status */
2567 sata_print_link_status(ap
);
2570 if (sata_scr_read(ap
, SCR_ERROR
, &serror
) == 0)
2571 sata_scr_write(ap
, SCR_ERROR
, serror
);
2573 /* re-enable interrupts */
2574 if (!ap
->ops
->error_handler
) {
2575 /* FIXME: hack. create a hook instead */
2576 if (ap
->ioaddr
.ctl_addr
)
2580 /* is double-select really necessary? */
2581 if (classes
[0] != ATA_DEV_NONE
)
2582 ap
->ops
->dev_select(ap
, 1);
2583 if (classes
[1] != ATA_DEV_NONE
)
2584 ap
->ops
->dev_select(ap
, 0);
2586 /* bail out if no device is present */
2587 if (classes
[0] == ATA_DEV_NONE
&& classes
[1] == ATA_DEV_NONE
) {
2588 DPRINTK("EXIT, no device\n");
2592 /* set up device control */
2593 if (ap
->ioaddr
.ctl_addr
) {
2594 if (ap
->flags
& ATA_FLAG_MMIO
)
2595 writeb(ap
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
2597 outb(ap
->ctl
, ap
->ioaddr
.ctl_addr
);
2604 * ata_std_probe_reset - standard probe reset method
2605 * @ap: prot to perform probe-reset
2606 * @classes: resulting classes of attached devices
2608 * The stock off-the-shelf ->probe_reset method.
2611 * Kernel thread context (may sleep)
2614 * 0 on success, -errno otherwise.
2616 int ata_std_probe_reset(struct ata_port
*ap
, unsigned int *classes
)
2618 ata_reset_fn_t hardreset
;
2621 if (sata_scr_valid(ap
))
2622 hardreset
= sata_std_hardreset
;
2624 return ata_drive_probe_reset(ap
, ata_std_probeinit
,
2625 ata_std_softreset
, hardreset
,
2626 ata_std_postreset
, classes
);
2629 int ata_do_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
2630 unsigned int *classes
)
2634 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2635 classes
[i
] = ATA_DEV_UNKNOWN
;
2637 rc
= reset(ap
, classes
);
2641 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2642 * is complete and convert all ATA_DEV_UNKNOWN to
2645 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2646 if (classes
[i
] != ATA_DEV_UNKNOWN
)
2649 if (i
< ATA_MAX_DEVICES
)
2650 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2651 if (classes
[i
] == ATA_DEV_UNKNOWN
)
2652 classes
[i
] = ATA_DEV_NONE
;
2658 * ata_drive_probe_reset - Perform probe reset with given methods
2659 * @ap: port to reset
2660 * @probeinit: probeinit method (can be NULL)
2661 * @softreset: softreset method (can be NULL)
2662 * @hardreset: hardreset method (can be NULL)
2663 * @postreset: postreset method (can be NULL)
2664 * @classes: resulting classes of attached devices
2666 * Reset the specified port and classify attached devices using
2667 * given methods. This function prefers softreset but tries all
2668 * possible reset sequences to reset and classify devices. This
2669 * function is intended to be used for constructing ->probe_reset
2670 * callback by low level drivers.
2672 * Reset methods should follow the following rules.
2674 * - Return 0 on sucess, -errno on failure.
2675 * - If classification is supported, fill classes[] with
2676 * recognized class codes.
2677 * - If classification is not supported, leave classes[] alone.
2680 * Kernel thread context (may sleep)
2683 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2684 * if classification fails, and any error code from reset
2687 int ata_drive_probe_reset(struct ata_port
*ap
, ata_probeinit_fn_t probeinit
,
2688 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2689 ata_postreset_fn_t postreset
, unsigned int *classes
)
2693 ata_eh_freeze_port(ap
);
2698 if (softreset
&& !sata_set_spd_needed(ap
)) {
2699 rc
= ata_do_reset(ap
, softreset
, classes
);
2700 if (rc
== 0 && classes
[0] != ATA_DEV_UNKNOWN
)
2702 ata_port_printk(ap
, KERN_INFO
, "softreset failed, "
2703 "will try hardreset in 5 secs\n");
2711 rc
= ata_do_reset(ap
, hardreset
, classes
);
2713 if (classes
[0] != ATA_DEV_UNKNOWN
)
2718 if (sata_down_spd_limit(ap
))
2721 ata_port_printk(ap
, KERN_INFO
, "hardreset failed, "
2722 "will retry in 5 secs\n");
2727 ata_port_printk(ap
, KERN_INFO
,
2728 "hardreset succeeded without classification, "
2729 "will retry softreset in 5 secs\n");
2732 rc
= ata_do_reset(ap
, softreset
, classes
);
2738 postreset(ap
, classes
);
2740 ata_eh_thaw_port(ap
);
2742 if (classes
[0] == ATA_DEV_UNKNOWN
)
2749 * ata_dev_same_device - Determine whether new ID matches configured device
2750 * @dev: device to compare against
2751 * @new_class: class of the new device
2752 * @new_id: IDENTIFY page of the new device
2754 * Compare @new_class and @new_id against @dev and determine
2755 * whether @dev is the device indicated by @new_class and
2762 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
2764 static int ata_dev_same_device(struct ata_device
*dev
, unsigned int new_class
,
2767 const u16
*old_id
= dev
->id
;
2768 unsigned char model
[2][41], serial
[2][21];
2771 if (dev
->class != new_class
) {
2772 ata_dev_printk(dev
, KERN_INFO
, "class mismatch %d != %d\n",
2773 dev
->class, new_class
);
2777 ata_id_c_string(old_id
, model
[0], ATA_ID_PROD_OFS
, sizeof(model
[0]));
2778 ata_id_c_string(new_id
, model
[1], ATA_ID_PROD_OFS
, sizeof(model
[1]));
2779 ata_id_c_string(old_id
, serial
[0], ATA_ID_SERNO_OFS
, sizeof(serial
[0]));
2780 ata_id_c_string(new_id
, serial
[1], ATA_ID_SERNO_OFS
, sizeof(serial
[1]));
2781 new_n_sectors
= ata_id_n_sectors(new_id
);
2783 if (strcmp(model
[0], model
[1])) {
2784 ata_dev_printk(dev
, KERN_INFO
, "model number mismatch "
2785 "'%s' != '%s'\n", model
[0], model
[1]);
2789 if (strcmp(serial
[0], serial
[1])) {
2790 ata_dev_printk(dev
, KERN_INFO
, "serial number mismatch "
2791 "'%s' != '%s'\n", serial
[0], serial
[1]);
2795 if (dev
->class == ATA_DEV_ATA
&& dev
->n_sectors
!= new_n_sectors
) {
2796 ata_dev_printk(dev
, KERN_INFO
, "n_sectors mismatch "
2798 (unsigned long long)dev
->n_sectors
,
2799 (unsigned long long)new_n_sectors
);
2807 * ata_dev_revalidate - Revalidate ATA device
2808 * @dev: device to revalidate
2809 * @post_reset: is this revalidation after reset?
2811 * Re-read IDENTIFY page and make sure @dev is still attached to
2815 * Kernel thread context (may sleep)
2818 * 0 on success, negative errno otherwise
2820 int ata_dev_revalidate(struct ata_device
*dev
, int post_reset
)
2822 unsigned int class = dev
->class;
2823 u16
*id
= (void *)dev
->ap
->sector_buf
;
2826 if (!ata_dev_enabled(dev
)) {
2832 rc
= ata_dev_read_id(dev
, &class, post_reset
, id
);
2836 /* is the device still there? */
2837 if (!ata_dev_same_device(dev
, class, id
)) {
2842 memcpy(dev
->id
, id
, sizeof(id
[0]) * ATA_ID_WORDS
);
2844 /* configure device according to the new ID */
2845 rc
= ata_dev_configure(dev
, 0);
2850 ata_dev_printk(dev
, KERN_ERR
, "revalidation failed (errno=%d)\n", rc
);
2854 static const char * const ata_dma_blacklist
[] = {
2855 "WDC AC11000H", NULL
,
2856 "WDC AC22100H", NULL
,
2857 "WDC AC32500H", NULL
,
2858 "WDC AC33100H", NULL
,
2859 "WDC AC31600H", NULL
,
2860 "WDC AC32100H", "24.09P07",
2861 "WDC AC23200L", "21.10N21",
2862 "Compaq CRD-8241B", NULL
,
2867 "SanDisk SDP3B", NULL
,
2868 "SanDisk SDP3B-64", NULL
,
2869 "SANYO CD-ROM CRD", NULL
,
2870 "HITACHI CDR-8", NULL
,
2871 "HITACHI CDR-8335", NULL
,
2872 "HITACHI CDR-8435", NULL
,
2873 "Toshiba CD-ROM XM-6202B", NULL
,
2874 "TOSHIBA CD-ROM XM-1702BC", NULL
,
2876 "E-IDE CD-ROM CR-840", NULL
,
2877 "CD-ROM Drive/F5A", NULL
,
2878 "WPI CDD-820", NULL
,
2879 "SAMSUNG CD-ROM SC-148C", NULL
,
2880 "SAMSUNG CD-ROM SC", NULL
,
2881 "SanDisk SDP3B-64", NULL
,
2882 "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL
,
2883 "_NEC DV5800A", NULL
,
2884 "SAMSUNG CD-ROM SN-124", "N001"
2887 static int ata_strim(char *s
, size_t len
)
2889 len
= strnlen(s
, len
);
2891 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2892 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2899 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2901 unsigned char model_num
[40];
2902 unsigned char model_rev
[16];
2903 unsigned int nlen
, rlen
;
2906 ata_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2908 ata_id_string(dev
->id
, model_rev
, ATA_ID_FW_REV_OFS
,
2910 nlen
= ata_strim(model_num
, sizeof(model_num
));
2911 rlen
= ata_strim(model_rev
, sizeof(model_rev
));
2913 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
+= 2) {
2914 if (!strncmp(ata_dma_blacklist
[i
], model_num
, nlen
)) {
2915 if (ata_dma_blacklist
[i
+1] == NULL
)
2917 if (!strncmp(ata_dma_blacklist
[i
], model_rev
, rlen
))
2925 * ata_dev_xfermask - Compute supported xfermask of the given device
2926 * @dev: Device to compute xfermask for
2928 * Compute supported xfermask of @dev and store it in
2929 * dev->*_mask. This function is responsible for applying all
2930 * known limits including host controller limits, device
2933 * FIXME: The current implementation limits all transfer modes to
2934 * the fastest of the lowested device on the port. This is not
2935 * required on most controllers.
2940 static void ata_dev_xfermask(struct ata_device
*dev
)
2942 struct ata_port
*ap
= dev
->ap
;
2943 struct ata_host_set
*hs
= ap
->host_set
;
2944 unsigned long xfer_mask
;
2947 xfer_mask
= ata_pack_xfermask(ap
->pio_mask
,
2948 ap
->mwdma_mask
, ap
->udma_mask
);
2950 /* Apply cable rule here. Don't apply it early because when
2951 * we handle hot plug the cable type can itself change.
2953 if (ap
->cbl
== ATA_CBL_PATA40
)
2954 xfer_mask
&= ~(0xF8 << ATA_SHIFT_UDMA
);
2956 /* FIXME: Use port-wide xfermask for now */
2957 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2958 struct ata_device
*d
= &ap
->device
[i
];
2960 if (ata_dev_absent(d
))
2963 if (ata_dev_disabled(d
)) {
2964 /* to avoid violating device selection timing */
2965 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2966 UINT_MAX
, UINT_MAX
);
2970 xfer_mask
&= ata_pack_xfermask(d
->pio_mask
,
2971 d
->mwdma_mask
, d
->udma_mask
);
2972 xfer_mask
&= ata_id_xfermask(d
->id
);
2973 if (ata_dma_blacklisted(d
))
2974 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2977 if (ata_dma_blacklisted(dev
))
2978 ata_dev_printk(dev
, KERN_WARNING
,
2979 "device is on DMA blacklist, disabling DMA\n");
2981 if (hs
->flags
& ATA_HOST_SIMPLEX
) {
2982 if (hs
->simplex_claimed
)
2983 xfer_mask
&= ~(ATA_MASK_MWDMA
| ATA_MASK_UDMA
);
2986 if (ap
->ops
->mode_filter
)
2987 xfer_mask
= ap
->ops
->mode_filter(ap
, dev
, xfer_mask
);
2989 ata_unpack_xfermask(xfer_mask
, &dev
->pio_mask
,
2990 &dev
->mwdma_mask
, &dev
->udma_mask
);
2994 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2995 * @dev: Device to which command will be sent
2997 * Issue SET FEATURES - XFER MODE command to device @dev
3001 * PCI/etc. bus probe sem.
3004 * 0 on success, AC_ERR_* mask otherwise.
3007 static unsigned int ata_dev_set_xfermode(struct ata_device
*dev
)
3009 struct ata_taskfile tf
;
3010 unsigned int err_mask
;
3012 /* set up set-features taskfile */
3013 DPRINTK("set features - xfer mode\n");
3015 ata_tf_init(dev
, &tf
);
3016 tf
.command
= ATA_CMD_SET_FEATURES
;
3017 tf
.feature
= SETFEATURES_XFER
;
3018 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3019 tf
.protocol
= ATA_PROT_NODATA
;
3020 tf
.nsect
= dev
->xfer_mode
;
3022 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3024 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3029 * ata_dev_init_params - Issue INIT DEV PARAMS command
3030 * @dev: Device to which command will be sent
3031 * @heads: Number of heads
3032 * @sectors: Number of sectors
3035 * Kernel thread context (may sleep)
3038 * 0 on success, AC_ERR_* mask otherwise.
3040 static unsigned int ata_dev_init_params(struct ata_device
*dev
,
3041 u16 heads
, u16 sectors
)
3043 struct ata_taskfile tf
;
3044 unsigned int err_mask
;
3046 /* Number of sectors per track 1-255. Number of heads 1-16 */
3047 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
3048 return AC_ERR_INVALID
;
3050 /* set up init dev params taskfile */
3051 DPRINTK("init dev params \n");
3053 ata_tf_init(dev
, &tf
);
3054 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
3055 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3056 tf
.protocol
= ATA_PROT_NODATA
;
3058 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
3060 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
3062 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
3067 * ata_sg_clean - Unmap DMA memory associated with command
3068 * @qc: Command containing DMA memory to be released
3070 * Unmap all mapped DMA memory associated with this command.
3073 * spin_lock_irqsave(host_set lock)
3076 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
3078 struct ata_port
*ap
= qc
->ap
;
3079 struct scatterlist
*sg
= qc
->__sg
;
3080 int dir
= qc
->dma_dir
;
3081 void *pad_buf
= NULL
;
3083 WARN_ON(!(qc
->flags
& ATA_QCFLAG_DMAMAP
));
3084 WARN_ON(sg
== NULL
);
3086 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
3087 WARN_ON(qc
->n_elem
> 1);
3089 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
3091 /* if we padded the buffer out to 32-bit bound, and data
3092 * xfer direction is from-device, we must copy from the
3093 * pad buffer back into the supplied buffer
3095 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
3096 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3098 if (qc
->flags
& ATA_QCFLAG_SG
) {
3100 dma_unmap_sg(ap
->dev
, sg
, qc
->n_elem
, dir
);
3101 /* restore last sg */
3102 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
3104 struct scatterlist
*psg
= &qc
->pad_sgent
;
3105 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3106 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
3107 kunmap_atomic(addr
, KM_IRQ0
);
3111 dma_unmap_single(ap
->dev
,
3112 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
3115 sg
->length
+= qc
->pad_len
;
3117 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3118 pad_buf
, qc
->pad_len
);
3121 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3126 * ata_fill_sg - Fill PCI IDE PRD table
3127 * @qc: Metadata associated with taskfile to be transferred
3129 * Fill PCI IDE PRD (scatter-gather) table with segments
3130 * associated with the current disk command.
3133 * spin_lock_irqsave(host_set lock)
3136 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
3138 struct ata_port
*ap
= qc
->ap
;
3139 struct scatterlist
*sg
;
3142 WARN_ON(qc
->__sg
== NULL
);
3143 WARN_ON(qc
->n_elem
== 0 && qc
->pad_len
== 0);
3146 ata_for_each_sg(sg
, qc
) {
3150 /* determine if physical DMA addr spans 64K boundary.
3151 * Note h/w doesn't support 64-bit, so we unconditionally
3152 * truncate dma_addr_t to u32.
3154 addr
= (u32
) sg_dma_address(sg
);
3155 sg_len
= sg_dma_len(sg
);
3158 offset
= addr
& 0xffff;
3160 if ((offset
+ sg_len
) > 0x10000)
3161 len
= 0x10000 - offset
;
3163 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
3164 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
3165 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
3174 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
3177 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
3178 * @qc: Metadata associated with taskfile to check
3180 * Allow low-level driver to filter ATA PACKET commands, returning
3181 * a status indicating whether or not it is OK to use DMA for the
3182 * supplied PACKET command.
3185 * spin_lock_irqsave(host_set lock)
3187 * RETURNS: 0 when ATAPI DMA can be used
3190 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
3192 struct ata_port
*ap
= qc
->ap
;
3193 int rc
= 0; /* Assume ATAPI DMA is OK by default */
3195 if (ap
->ops
->check_atapi_dma
)
3196 rc
= ap
->ops
->check_atapi_dma(qc
);
3201 * ata_qc_prep - Prepare taskfile for submission
3202 * @qc: Metadata associated with taskfile to be prepared
3204 * Prepare ATA taskfile for submission.
3207 * spin_lock_irqsave(host_set lock)
3209 void ata_qc_prep(struct ata_queued_cmd
*qc
)
3211 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3217 void ata_noop_qc_prep(struct ata_queued_cmd
*qc
) { }
3220 * ata_sg_init_one - Associate command with memory buffer
3221 * @qc: Command to be associated
3222 * @buf: Memory buffer
3223 * @buflen: Length of memory buffer, in bytes.
3225 * Initialize the data-related elements of queued_cmd @qc
3226 * to point to a single memory buffer, @buf of byte length @buflen.
3229 * spin_lock_irqsave(host_set lock)
3232 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
3234 struct scatterlist
*sg
;
3236 qc
->flags
|= ATA_QCFLAG_SINGLE
;
3238 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
3239 qc
->__sg
= &qc
->sgent
;
3241 qc
->orig_n_elem
= 1;
3245 sg_init_one(sg
, buf
, buflen
);
3249 * ata_sg_init - Associate command with scatter-gather table.
3250 * @qc: Command to be associated
3251 * @sg: Scatter-gather table.
3252 * @n_elem: Number of elements in s/g table.
3254 * Initialize the data-related elements of queued_cmd @qc
3255 * to point to a scatter-gather table @sg, containing @n_elem
3259 * spin_lock_irqsave(host_set lock)
3262 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
3263 unsigned int n_elem
)
3265 qc
->flags
|= ATA_QCFLAG_SG
;
3267 qc
->n_elem
= n_elem
;
3268 qc
->orig_n_elem
= n_elem
;
3272 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
3273 * @qc: Command with memory buffer to be mapped.
3275 * DMA-map the memory buffer associated with queued_cmd @qc.
3278 * spin_lock_irqsave(host_set lock)
3281 * Zero on success, negative on error.
3284 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
3286 struct ata_port
*ap
= qc
->ap
;
3287 int dir
= qc
->dma_dir
;
3288 struct scatterlist
*sg
= qc
->__sg
;
3289 dma_addr_t dma_address
;
3292 /* we must lengthen transfers to end on a 32-bit boundary */
3293 qc
->pad_len
= sg
->length
& 3;
3295 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3296 struct scatterlist
*psg
= &qc
->pad_sgent
;
3298 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3300 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3302 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
3303 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
3306 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3307 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3309 sg
->length
-= qc
->pad_len
;
3310 if (sg
->length
== 0)
3313 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
3314 sg
->length
, qc
->pad_len
);
3322 dma_address
= dma_map_single(ap
->dev
, qc
->buf_virt
,
3324 if (dma_mapping_error(dma_address
)) {
3326 sg
->length
+= qc
->pad_len
;
3330 sg_dma_address(sg
) = dma_address
;
3331 sg_dma_len(sg
) = sg
->length
;
3334 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
3335 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3341 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
3342 * @qc: Command with scatter-gather table to be mapped.
3344 * DMA-map the scatter-gather table associated with queued_cmd @qc.
3347 * spin_lock_irqsave(host_set lock)
3350 * Zero on success, negative on error.
3354 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
3356 struct ata_port
*ap
= qc
->ap
;
3357 struct scatterlist
*sg
= qc
->__sg
;
3358 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
3359 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
3361 VPRINTK("ENTER, ata%u\n", ap
->id
);
3362 WARN_ON(!(qc
->flags
& ATA_QCFLAG_SG
));
3364 /* we must lengthen transfers to end on a 32-bit boundary */
3365 qc
->pad_len
= lsg
->length
& 3;
3367 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3368 struct scatterlist
*psg
= &qc
->pad_sgent
;
3369 unsigned int offset
;
3371 WARN_ON(qc
->dev
->class != ATA_DEV_ATAPI
);
3373 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
3376 * psg->page/offset are used to copy to-be-written
3377 * data in this function or read data in ata_sg_clean.
3379 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
3380 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
3381 psg
->offset
= offset_in_page(offset
);
3383 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
3384 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
3385 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
3386 kunmap_atomic(addr
, KM_IRQ0
);
3389 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
3390 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
3392 lsg
->length
-= qc
->pad_len
;
3393 if (lsg
->length
== 0)
3396 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
3397 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
3400 pre_n_elem
= qc
->n_elem
;
3401 if (trim_sg
&& pre_n_elem
)
3410 n_elem
= dma_map_sg(ap
->dev
, sg
, pre_n_elem
, dir
);
3412 /* restore last sg */
3413 lsg
->length
+= qc
->pad_len
;
3417 DPRINTK("%d sg elements mapped\n", n_elem
);
3420 qc
->n_elem
= n_elem
;
3426 * ata_poll_qc_complete - turn irq back on and finish qc
3427 * @qc: Command to complete
3428 * @err_mask: ATA status register content
3431 * None. (grabs host lock)
3434 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
3436 struct ata_port
*ap
= qc
->ap
;
3437 unsigned long flags
;
3439 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
3440 ap
->flags
&= ~ATA_FLAG_NOINTR
;
3442 ata_qc_complete(qc
);
3443 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
3447 * ata_pio_poll - poll using PIO, depending on current state
3448 * @qc: qc in progress
3451 * None. (executing in kernel thread context)
3454 * timeout value to use
3456 static unsigned long ata_pio_poll(struct ata_queued_cmd
*qc
)
3458 struct ata_port
*ap
= qc
->ap
;
3460 unsigned int poll_state
= HSM_ST_UNKNOWN
;
3461 unsigned int reg_state
= HSM_ST_UNKNOWN
;
3463 switch (ap
->hsm_task_state
) {
3466 poll_state
= HSM_ST_POLL
;
3470 case HSM_ST_LAST_POLL
:
3471 poll_state
= HSM_ST_LAST_POLL
;
3472 reg_state
= HSM_ST_LAST
;
3479 status
= ata_chk_status(ap
);
3480 if (status
& ATA_BUSY
) {
3481 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
3482 qc
->err_mask
|= AC_ERR_TIMEOUT
;
3483 ap
->hsm_task_state
= HSM_ST_TMOUT
;
3486 ap
->hsm_task_state
= poll_state
;
3487 return ATA_SHORT_PAUSE
;
3490 ap
->hsm_task_state
= reg_state
;
3495 * ata_pio_complete - check if drive is busy or idle
3496 * @qc: qc to complete
3499 * None. (executing in kernel thread context)
3502 * Non-zero if qc completed, zero otherwise.
3504 static int ata_pio_complete(struct ata_queued_cmd
*qc
)
3506 struct ata_port
*ap
= qc
->ap
;
3510 * This is purely heuristic. This is a fast path. Sometimes when
3511 * we enter, BSY will be cleared in a chk-status or two. If not,
3512 * the drive is probably seeking or something. Snooze for a couple
3513 * msecs, then chk-status again. If still busy, fall back to
3514 * HSM_ST_POLL state.
3516 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3517 if (drv_stat
& ATA_BUSY
) {
3519 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3520 if (drv_stat
& ATA_BUSY
) {
3521 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
3522 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3527 drv_stat
= ata_wait_idle(ap
);
3528 if (!ata_ok(drv_stat
)) {
3529 qc
->err_mask
|= __ac_err_mask(drv_stat
);
3530 ap
->hsm_task_state
= HSM_ST_ERR
;
3534 ap
->hsm_task_state
= HSM_ST_IDLE
;
3536 WARN_ON(qc
->err_mask
);
3537 ata_poll_qc_complete(qc
);
3539 /* another command may start at this point */
3546 * swap_buf_le16 - swap halves of 16-bit words in place
3547 * @buf: Buffer to swap
3548 * @buf_words: Number of 16-bit words in buffer.
3550 * Swap halves of 16-bit words if needed to convert from
3551 * little-endian byte order to native cpu byte order, or
3555 * Inherited from caller.
3557 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3562 for (i
= 0; i
< buf_words
; i
++)
3563 buf
[i
] = le16_to_cpu(buf
[i
]);
3564 #endif /* __BIG_ENDIAN */
3568 * ata_mmio_data_xfer - Transfer data by MMIO
3569 * @ap: port to read/write
3571 * @buflen: buffer length
3572 * @write_data: read/write
3574 * Transfer data from/to the device data register by MMIO.
3577 * Inherited from caller.
3580 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3581 unsigned int buflen
, int write_data
)
3584 unsigned int words
= buflen
>> 1;
3585 u16
*buf16
= (u16
*) buf
;
3586 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3588 /* Transfer multiple of 2 bytes */
3590 for (i
= 0; i
< words
; i
++)
3591 writew(le16_to_cpu(buf16
[i
]), mmio
);
3593 for (i
= 0; i
< words
; i
++)
3594 buf16
[i
] = cpu_to_le16(readw(mmio
));
3597 /* Transfer trailing 1 byte, if any. */
3598 if (unlikely(buflen
& 0x01)) {
3599 u16 align_buf
[1] = { 0 };
3600 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3603 memcpy(align_buf
, trailing_buf
, 1);
3604 writew(le16_to_cpu(align_buf
[0]), mmio
);
3606 align_buf
[0] = cpu_to_le16(readw(mmio
));
3607 memcpy(trailing_buf
, align_buf
, 1);
3613 * ata_pio_data_xfer - Transfer data by PIO
3614 * @ap: port to read/write
3616 * @buflen: buffer length
3617 * @write_data: read/write
3619 * Transfer data from/to the device data register by PIO.
3622 * Inherited from caller.
3625 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3626 unsigned int buflen
, int write_data
)
3628 unsigned int words
= buflen
>> 1;
3630 /* Transfer multiple of 2 bytes */
3632 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3634 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3636 /* Transfer trailing 1 byte, if any. */
3637 if (unlikely(buflen
& 0x01)) {
3638 u16 align_buf
[1] = { 0 };
3639 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3642 memcpy(align_buf
, trailing_buf
, 1);
3643 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3645 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3646 memcpy(trailing_buf
, align_buf
, 1);
3652 * ata_data_xfer - Transfer data from/to the data register.
3653 * @ap: port to read/write
3655 * @buflen: buffer length
3656 * @do_write: read/write
3658 * Transfer data from/to the device data register.
3661 * Inherited from caller.
3664 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3665 unsigned int buflen
, int do_write
)
3667 /* Make the crap hardware pay the costs not the good stuff */
3668 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3669 unsigned long flags
;
3670 local_irq_save(flags
);
3671 if (ap
->flags
& ATA_FLAG_MMIO
)
3672 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3674 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3675 local_irq_restore(flags
);
3677 if (ap
->flags
& ATA_FLAG_MMIO
)
3678 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3680 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3685 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3686 * @qc: Command on going
3688 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3691 * Inherited from caller.
3694 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3696 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3697 struct scatterlist
*sg
= qc
->__sg
;
3698 struct ata_port
*ap
= qc
->ap
;
3700 unsigned int offset
;
3703 if (qc
->cursect
== (qc
->nsect
- 1))
3704 ap
->hsm_task_state
= HSM_ST_LAST
;
3706 page
= sg
[qc
->cursg
].page
;
3707 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3709 /* get the current page and offset */
3710 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3711 offset
%= PAGE_SIZE
;
3713 buf
= kmap(page
) + offset
;
3718 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3723 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3725 /* do the actual data transfer */
3726 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3727 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3733 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3734 * @qc: Command on going
3735 * @bytes: number of bytes
3737 * Transfer Transfer data from/to the ATAPI device.
3740 * Inherited from caller.
3744 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3746 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3747 struct scatterlist
*sg
= qc
->__sg
;
3748 struct ata_port
*ap
= qc
->ap
;
3751 unsigned int offset
, count
;
3753 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3754 ap
->hsm_task_state
= HSM_ST_LAST
;
3757 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3759 * The end of qc->sg is reached and the device expects
3760 * more data to transfer. In order not to overrun qc->sg
3761 * and fulfill length specified in the byte count register,
3762 * - for read case, discard trailing data from the device
3763 * - for write case, padding zero data to the device
3765 u16 pad_buf
[1] = { 0 };
3766 unsigned int words
= bytes
>> 1;
3769 if (words
) /* warning if bytes > 1 */
3770 ata_dev_printk(qc
->dev
, KERN_WARNING
,
3771 "%u bytes trailing data\n", bytes
);
3773 for (i
= 0; i
< words
; i
++)
3774 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3776 ap
->hsm_task_state
= HSM_ST_LAST
;
3780 sg
= &qc
->__sg
[qc
->cursg
];
3783 offset
= sg
->offset
+ qc
->cursg_ofs
;
3785 /* get the current page and offset */
3786 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3787 offset
%= PAGE_SIZE
;
3789 /* don't overrun current sg */
3790 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3792 /* don't cross page boundaries */
3793 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3795 buf
= kmap(page
) + offset
;
3798 qc
->curbytes
+= count
;
3799 qc
->cursg_ofs
+= count
;
3801 if (qc
->cursg_ofs
== sg
->length
) {
3806 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3808 /* do the actual data transfer */
3809 ata_data_xfer(ap
, buf
, count
, do_write
);
3818 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3819 * @qc: Command on going
3821 * Transfer Transfer data from/to the ATAPI device.
3824 * Inherited from caller.
3827 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3829 struct ata_port
*ap
= qc
->ap
;
3830 struct ata_device
*dev
= qc
->dev
;
3831 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3832 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3834 ap
->ops
->tf_read(ap
, &qc
->tf
);
3835 ireason
= qc
->tf
.nsect
;
3836 bc_lo
= qc
->tf
.lbam
;
3837 bc_hi
= qc
->tf
.lbah
;
3838 bytes
= (bc_hi
<< 8) | bc_lo
;
3840 /* shall be cleared to zero, indicating xfer of data */
3841 if (ireason
& (1 << 0))
3844 /* make sure transfer direction matches expected */
3845 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3846 if (do_write
!= i_write
)
3849 __atapi_pio_bytes(qc
, bytes
);
3854 ata_dev_printk(dev
, KERN_INFO
, "ATAPI check failed\n");
3855 qc
->err_mask
|= AC_ERR_HSM
;
3856 ap
->hsm_task_state
= HSM_ST_ERR
;
3860 * ata_pio_block - start PIO on a block
3861 * @qc: qc to transfer block for
3864 * None. (executing in kernel thread context)
3866 static void ata_pio_block(struct ata_queued_cmd
*qc
)
3868 struct ata_port
*ap
= qc
->ap
;
3872 * This is purely heuristic. This is a fast path.
3873 * Sometimes when we enter, BSY will be cleared in
3874 * a chk-status or two. If not, the drive is probably seeking
3875 * or something. Snooze for a couple msecs, then
3876 * chk-status again. If still busy, fall back to
3877 * HSM_ST_POLL state.
3879 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3880 if (status
& ATA_BUSY
) {
3882 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3883 if (status
& ATA_BUSY
) {
3884 ap
->hsm_task_state
= HSM_ST_POLL
;
3885 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3891 if (status
& (ATA_ERR
| ATA_DF
)) {
3892 qc
->err_mask
|= AC_ERR_DEV
;
3893 ap
->hsm_task_state
= HSM_ST_ERR
;
3897 /* transfer data if any */
3898 if (is_atapi_taskfile(&qc
->tf
)) {
3899 /* DRQ=0 means no more data to transfer */
3900 if ((status
& ATA_DRQ
) == 0) {
3901 ap
->hsm_task_state
= HSM_ST_LAST
;
3905 atapi_pio_bytes(qc
);
3907 /* handle BSY=0, DRQ=0 as error */
3908 if ((status
& ATA_DRQ
) == 0) {
3909 qc
->err_mask
|= AC_ERR_HSM
;
3910 ap
->hsm_task_state
= HSM_ST_ERR
;
3918 static void ata_pio_error(struct ata_queued_cmd
*qc
)
3920 struct ata_port
*ap
= qc
->ap
;
3922 if (qc
->tf
.command
!= ATA_CMD_PACKET
)
3923 ata_dev_printk(qc
->dev
, KERN_WARNING
, "PIO error\n");
3925 /* make sure qc->err_mask is available to
3926 * know what's wrong and recover
3928 WARN_ON(qc
->err_mask
== 0);
3930 ap
->hsm_task_state
= HSM_ST_IDLE
;
3932 ata_poll_qc_complete(qc
);
3935 static void ata_pio_task(void *_data
)
3937 struct ata_queued_cmd
*qc
= _data
;
3938 struct ata_port
*ap
= qc
->ap
;
3939 unsigned long timeout
;
3946 switch (ap
->hsm_task_state
) {
3955 qc_completed
= ata_pio_complete(qc
);
3959 case HSM_ST_LAST_POLL
:
3960 timeout
= ata_pio_poll(qc
);
3970 ata_port_queue_task(ap
, ata_pio_task
, qc
, timeout
);
3971 else if (!qc_completed
)
3976 * atapi_packet_task - Write CDB bytes to hardware
3977 * @_data: qc in progress
3979 * When device has indicated its readiness to accept
3980 * a CDB, this function is called. Send the CDB.
3981 * If DMA is to be performed, exit immediately.
3982 * Otherwise, we are in polling mode, so poll
3983 * status under operation succeeds or fails.
3986 * Kernel thread context (may sleep)
3988 static void atapi_packet_task(void *_data
)
3990 struct ata_queued_cmd
*qc
= _data
;
3991 struct ata_port
*ap
= qc
->ap
;
3994 /* sleep-wait for BSY to clear */
3995 DPRINTK("busy wait\n");
3996 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
3997 qc
->err_mask
|= AC_ERR_TIMEOUT
;
4001 /* make sure DRQ is set */
4002 status
= ata_chk_status(ap
);
4003 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
4004 qc
->err_mask
|= AC_ERR_HSM
;
4009 DPRINTK("send cdb\n");
4010 WARN_ON(qc
->dev
->cdb_len
< 12);
4012 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
4013 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4014 unsigned long flags
;
4016 /* Once we're done issuing command and kicking bmdma,
4017 * irq handler takes over. To not lose irq, we need
4018 * to clear NOINTR flag before sending cdb, but
4019 * interrupt handler shouldn't be invoked before we're
4020 * finished. Hence, the following locking.
4022 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4023 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4024 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4025 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4026 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4027 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4029 ata_data_xfer(ap
, qc
->cdb
, qc
->dev
->cdb_len
, 1);
4031 /* PIO commands are handled by polling */
4032 ap
->hsm_task_state
= HSM_ST
;
4033 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4039 ata_poll_qc_complete(qc
);
4043 * ata_qc_new - Request an available ATA command, for queueing
4044 * @ap: Port associated with device @dev
4045 * @dev: Device from whom we request an available command structure
4051 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
4053 struct ata_queued_cmd
*qc
= NULL
;
4056 /* no command while frozen */
4057 if (unlikely(ap
->flags
& ATA_FLAG_FROZEN
))
4060 /* the last tag is reserved for internal command. */
4061 for (i
= 0; i
< ATA_MAX_QUEUE
- 1; i
++)
4062 if (!test_and_set_bit(i
, &ap
->qactive
)) {
4063 qc
= __ata_qc_from_tag(ap
, i
);
4074 * ata_qc_new_init - Request an available ATA command, and initialize it
4075 * @dev: Device from whom we request an available command structure
4081 struct ata_queued_cmd
*ata_qc_new_init(struct ata_device
*dev
)
4083 struct ata_port
*ap
= dev
->ap
;
4084 struct ata_queued_cmd
*qc
;
4086 qc
= ata_qc_new(ap
);
4099 * ata_qc_free - free unused ata_queued_cmd
4100 * @qc: Command to complete
4102 * Designed to free unused ata_queued_cmd object
4103 * in case something prevents using it.
4106 * spin_lock_irqsave(host_set lock)
4108 void ata_qc_free(struct ata_queued_cmd
*qc
)
4110 struct ata_port
*ap
= qc
->ap
;
4113 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4117 if (likely(ata_tag_valid(tag
))) {
4118 qc
->tag
= ATA_TAG_POISON
;
4119 clear_bit(tag
, &ap
->qactive
);
4123 void __ata_qc_complete(struct ata_queued_cmd
*qc
)
4125 WARN_ON(qc
== NULL
); /* ata_qc_from_tag _might_ return NULL */
4126 WARN_ON(!(qc
->flags
& ATA_QCFLAG_ACTIVE
));
4128 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
4131 /* command should be marked inactive atomically with qc completion */
4132 qc
->ap
->active_tag
= ATA_TAG_POISON
;
4134 /* atapi: mark qc as inactive to prevent the interrupt handler
4135 * from completing the command twice later, before the error handler
4136 * is called. (when rc != 0 and atapi request sense is needed)
4138 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
4140 /* call completion callback */
4141 qc
->complete_fn(qc
);
4145 * ata_qc_complete - Complete an active ATA command
4146 * @qc: Command to complete
4147 * @err_mask: ATA Status register contents
4149 * Indicate to the mid and upper layers that an ATA
4150 * command has completed, with either an ok or not-ok status.
4153 * spin_lock_irqsave(host_set lock)
4155 void ata_qc_complete(struct ata_queued_cmd
*qc
)
4157 struct ata_port
*ap
= qc
->ap
;
4159 /* XXX: New EH and old EH use different mechanisms to
4160 * synchronize EH with regular execution path.
4162 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4163 * Normal execution path is responsible for not accessing a
4164 * failed qc. libata core enforces the rule by returning NULL
4165 * from ata_qc_from_tag() for failed qcs.
4167 * Old EH depends on ata_qc_complete() nullifying completion
4168 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
4169 * not synchronize with interrupt handler. Only PIO task is
4172 if (ap
->ops
->error_handler
) {
4173 WARN_ON(ap
->flags
& ATA_FLAG_FROZEN
);
4175 if (unlikely(qc
->err_mask
))
4176 qc
->flags
|= ATA_QCFLAG_FAILED
;
4178 if (unlikely(qc
->flags
& ATA_QCFLAG_FAILED
)) {
4179 if (!ata_tag_internal(qc
->tag
)) {
4180 /* always fill result TF for failed qc */
4181 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4182 ata_qc_schedule_eh(qc
);
4187 /* read result TF if requested */
4188 if (qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4189 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4191 __ata_qc_complete(qc
);
4193 if (qc
->flags
& ATA_QCFLAG_EH_SCHEDULED
)
4196 /* read result TF if failed or requested */
4197 if (qc
->err_mask
|| qc
->flags
& ATA_QCFLAG_RESULT_TF
)
4198 ap
->ops
->tf_read(ap
, &qc
->result_tf
);
4200 __ata_qc_complete(qc
);
4204 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
4206 struct ata_port
*ap
= qc
->ap
;
4208 switch (qc
->tf
.protocol
) {
4210 case ATA_PROT_ATAPI_DMA
:
4213 case ATA_PROT_ATAPI
:
4215 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
4228 * ata_qc_issue - issue taskfile to device
4229 * @qc: command to issue to device
4231 * Prepare an ATA command to submission to device.
4232 * This includes mapping the data into a DMA-able
4233 * area, filling in the S/G table, and finally
4234 * writing the taskfile to hardware, starting the command.
4237 * spin_lock_irqsave(host_set lock)
4239 void ata_qc_issue(struct ata_queued_cmd
*qc
)
4241 struct ata_port
*ap
= qc
->ap
;
4243 qc
->ap
->active_tag
= qc
->tag
;
4244 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
4246 if (ata_should_dma_map(qc
)) {
4247 if (qc
->flags
& ATA_QCFLAG_SG
) {
4248 if (ata_sg_setup(qc
))
4250 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
4251 if (ata_sg_setup_one(qc
))
4255 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4258 ap
->ops
->qc_prep(qc
);
4260 qc
->err_mask
|= ap
->ops
->qc_issue(qc
);
4261 if (unlikely(qc
->err_mask
))
4266 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
4267 qc
->err_mask
|= AC_ERR_SYSTEM
;
4269 ata_qc_complete(qc
);
4273 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
4274 * @qc: command to issue to device
4276 * Using various libata functions and hooks, this function
4277 * starts an ATA command. ATA commands are grouped into
4278 * classes called "protocols", and issuing each type of protocol
4279 * is slightly different.
4281 * May be used as the qc_issue() entry in ata_port_operations.
4284 * spin_lock_irqsave(host_set lock)
4287 * Zero on success, AC_ERR_* mask on failure
4290 unsigned int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
4292 struct ata_port
*ap
= qc
->ap
;
4294 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
4296 switch (qc
->tf
.protocol
) {
4297 case ATA_PROT_NODATA
:
4298 ata_tf_to_host(ap
, &qc
->tf
);
4302 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4303 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4304 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4307 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
4308 ata_qc_set_polling(qc
);
4309 ata_tf_to_host(ap
, &qc
->tf
);
4310 ap
->hsm_task_state
= HSM_ST
;
4311 ata_port_queue_task(ap
, ata_pio_task
, qc
, 0);
4314 case ATA_PROT_ATAPI
:
4315 ata_qc_set_polling(qc
);
4316 ata_tf_to_host(ap
, &qc
->tf
);
4317 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4320 case ATA_PROT_ATAPI_NODATA
:
4321 ap
->flags
|= ATA_FLAG_NOINTR
;
4322 ata_tf_to_host(ap
, &qc
->tf
);
4323 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4326 case ATA_PROT_ATAPI_DMA
:
4327 ap
->flags
|= ATA_FLAG_NOINTR
;
4328 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
4329 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
4330 ata_port_queue_task(ap
, atapi_packet_task
, qc
, 0);
4335 return AC_ERR_SYSTEM
;
4342 * ata_host_intr - Handle host interrupt for given (port, task)
4343 * @ap: Port on which interrupt arrived (possibly...)
4344 * @qc: Taskfile currently active in engine
4346 * Handle host interrupt for given queued command. Currently,
4347 * only DMA interrupts are handled. All other commands are
4348 * handled via polling with interrupts disabled (nIEN bit).
4351 * spin_lock_irqsave(host_set lock)
4354 * One if interrupt was handled, zero if not (shared irq).
4357 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4358 struct ata_queued_cmd
*qc
)
4360 u8 status
, host_stat
;
4362 switch (qc
->tf
.protocol
) {
4365 case ATA_PROT_ATAPI_DMA
:
4366 case ATA_PROT_ATAPI
:
4367 /* check status of DMA engine */
4368 host_stat
= ap
->ops
->bmdma_status(ap
);
4369 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4371 /* if it's not our irq... */
4372 if (!(host_stat
& ATA_DMA_INTR
))
4375 /* before we do anything else, clear DMA-Start bit */
4376 ap
->ops
->bmdma_stop(qc
);
4380 case ATA_PROT_ATAPI_NODATA
:
4381 case ATA_PROT_NODATA
:
4382 /* check altstatus */
4383 status
= ata_altstatus(ap
);
4384 if (status
& ATA_BUSY
)
4387 /* check main status, clearing INTRQ */
4388 status
= ata_chk_status(ap
);
4389 if (unlikely(status
& ATA_BUSY
))
4391 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4392 ap
->id
, qc
->tf
.protocol
, status
);
4394 /* ack bmdma irq events */
4395 ap
->ops
->irq_clear(ap
);
4397 /* complete taskfile transaction */
4398 qc
->err_mask
|= ac_err_mask(status
);
4399 ata_qc_complete(qc
);
4406 return 1; /* irq handled */
4409 ap
->stats
.idle_irq
++;
4412 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4413 ata_irq_ack(ap
, 0); /* debug trap */
4414 ata_port_printk(ap
, KERN_WARNING
, "irq trap\n");
4418 return 0; /* irq not handled */
4422 * ata_interrupt - Default ATA host interrupt handler
4423 * @irq: irq line (unused)
4424 * @dev_instance: pointer to our ata_host_set information structure
4427 * Default interrupt handler for PCI IDE devices. Calls
4428 * ata_host_intr() for each port that is not disabled.
4431 * Obtains host_set lock during operation.
4434 * IRQ_NONE or IRQ_HANDLED.
4437 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4439 struct ata_host_set
*host_set
= dev_instance
;
4441 unsigned int handled
= 0;
4442 unsigned long flags
;
4444 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4445 spin_lock_irqsave(&host_set
->lock
, flags
);
4447 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4448 struct ata_port
*ap
;
4450 ap
= host_set
->ports
[i
];
4452 !(ap
->flags
& (ATA_FLAG_DISABLED
| ATA_FLAG_NOINTR
))) {
4453 struct ata_queued_cmd
*qc
;
4455 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4456 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4457 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4458 handled
|= ata_host_intr(ap
, qc
);
4462 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4464 return IRQ_RETVAL(handled
);
4468 * sata_scr_valid - test whether SCRs are accessible
4469 * @ap: ATA port to test SCR accessibility for
4471 * Test whether SCRs are accessible for @ap.
4477 * 1 if SCRs are accessible, 0 otherwise.
4479 int sata_scr_valid(struct ata_port
*ap
)
4481 return ap
->cbl
== ATA_CBL_SATA
&& ap
->ops
->scr_read
;
4485 * sata_scr_read - read SCR register of the specified port
4486 * @ap: ATA port to read SCR for
4488 * @val: Place to store read value
4490 * Read SCR register @reg of @ap into *@val. This function is
4491 * guaranteed to succeed if the cable type of the port is SATA
4492 * and the port implements ->scr_read.
4498 * 0 on success, negative errno on failure.
4500 int sata_scr_read(struct ata_port
*ap
, int reg
, u32
*val
)
4502 if (sata_scr_valid(ap
)) {
4503 *val
= ap
->ops
->scr_read(ap
, reg
);
4510 * sata_scr_write - write SCR register of the specified port
4511 * @ap: ATA port to write SCR for
4512 * @reg: SCR to write
4513 * @val: value to write
4515 * Write @val to SCR register @reg of @ap. This function is
4516 * guaranteed to succeed if the cable type of the port is SATA
4517 * and the port implements ->scr_read.
4523 * 0 on success, negative errno on failure.
4525 int sata_scr_write(struct ata_port
*ap
, int reg
, u32 val
)
4527 if (sata_scr_valid(ap
)) {
4528 ap
->ops
->scr_write(ap
, reg
, val
);
4535 * sata_scr_write_flush - write SCR register of the specified port and flush
4536 * @ap: ATA port to write SCR for
4537 * @reg: SCR to write
4538 * @val: value to write
4540 * This function is identical to sata_scr_write() except that this
4541 * function performs flush after writing to the register.
4547 * 0 on success, negative errno on failure.
4549 int sata_scr_write_flush(struct ata_port
*ap
, int reg
, u32 val
)
4551 if (sata_scr_valid(ap
)) {
4552 ap
->ops
->scr_write(ap
, reg
, val
);
4553 ap
->ops
->scr_read(ap
, reg
);
4560 * ata_port_online - test whether the given port is online
4561 * @ap: ATA port to test
4563 * Test whether @ap is online. Note that this function returns 0
4564 * if online status of @ap cannot be obtained, so
4565 * ata_port_online(ap) != !ata_port_offline(ap).
4571 * 1 if the port online status is available and online.
4573 int ata_port_online(struct ata_port
*ap
)
4577 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) == 0x3)
4583 * ata_port_offline - test whether the given port is offline
4584 * @ap: ATA port to test
4586 * Test whether @ap is offline. Note that this function returns
4587 * 0 if offline status of @ap cannot be obtained, so
4588 * ata_port_online(ap) != !ata_port_offline(ap).
4594 * 1 if the port offline status is available and offline.
4596 int ata_port_offline(struct ata_port
*ap
)
4600 if (!sata_scr_read(ap
, SCR_STATUS
, &sstatus
) && (sstatus
& 0xf) != 0x3)
4606 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4607 * without filling any other registers
4609 static int ata_do_simple_cmd(struct ata_device
*dev
, u8 cmd
)
4611 struct ata_taskfile tf
;
4614 ata_tf_init(dev
, &tf
);
4617 tf
.flags
|= ATA_TFLAG_DEVICE
;
4618 tf
.protocol
= ATA_PROT_NODATA
;
4620 err
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0);
4622 ata_dev_printk(dev
, KERN_ERR
, "%s: ata command failed: %d\n",
4628 static int ata_flush_cache(struct ata_device
*dev
)
4632 if (!ata_try_flush_cache(dev
))
4635 if (ata_id_has_flush_ext(dev
->id
))
4636 cmd
= ATA_CMD_FLUSH_EXT
;
4638 cmd
= ATA_CMD_FLUSH
;
4640 return ata_do_simple_cmd(dev
, cmd
);
4643 static int ata_standby_drive(struct ata_device
*dev
)
4645 return ata_do_simple_cmd(dev
, ATA_CMD_STANDBYNOW1
);
4648 static int ata_start_drive(struct ata_device
*dev
)
4650 return ata_do_simple_cmd(dev
, ATA_CMD_IDLEIMMEDIATE
);
4654 * ata_device_resume - wakeup a previously suspended devices
4655 * @dev: the device to resume
4657 * Kick the drive back into action, by sending it an idle immediate
4658 * command and making sure its transfer mode matches between drive
4662 int ata_device_resume(struct ata_device
*dev
)
4664 struct ata_port
*ap
= dev
->ap
;
4666 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4667 struct ata_device
*failed_dev
;
4668 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4669 while (ata_set_mode(ap
, &failed_dev
))
4670 ata_dev_disable(failed_dev
);
4672 if (!ata_dev_enabled(dev
))
4674 if (dev
->class == ATA_DEV_ATA
)
4675 ata_start_drive(dev
);
4681 * ata_device_suspend - prepare a device for suspend
4682 * @dev: the device to suspend
4684 * Flush the cache on the drive, if appropriate, then issue a
4685 * standbynow command.
4687 int ata_device_suspend(struct ata_device
*dev
, pm_message_t state
)
4689 struct ata_port
*ap
= dev
->ap
;
4691 if (!ata_dev_enabled(dev
))
4693 if (dev
->class == ATA_DEV_ATA
)
4694 ata_flush_cache(dev
);
4696 if (state
.event
!= PM_EVENT_FREEZE
)
4697 ata_standby_drive(dev
);
4698 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4703 * ata_port_start - Set port up for dma.
4704 * @ap: Port to initialize
4706 * Called just after data structures for each port are
4707 * initialized. Allocates space for PRD table.
4709 * May be used as the port_start() entry in ata_port_operations.
4712 * Inherited from caller.
4715 int ata_port_start (struct ata_port
*ap
)
4717 struct device
*dev
= ap
->dev
;
4720 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4724 rc
= ata_pad_alloc(ap
, dev
);
4726 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4730 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4737 * ata_port_stop - Undo ata_port_start()
4738 * @ap: Port to shut down
4740 * Frees the PRD table.
4742 * May be used as the port_stop() entry in ata_port_operations.
4745 * Inherited from caller.
4748 void ata_port_stop (struct ata_port
*ap
)
4750 struct device
*dev
= ap
->dev
;
4752 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4753 ata_pad_free(ap
, dev
);
4756 void ata_host_stop (struct ata_host_set
*host_set
)
4758 if (host_set
->mmio_base
)
4759 iounmap(host_set
->mmio_base
);
4764 * ata_host_remove - Unregister SCSI host structure with upper layers
4765 * @ap: Port to unregister
4766 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4769 * Inherited from caller.
4772 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4774 struct Scsi_Host
*sh
= ap
->host
;
4779 scsi_remove_host(sh
);
4781 ap
->ops
->port_stop(ap
);
4785 * ata_host_init - Initialize an ata_port structure
4786 * @ap: Structure to initialize
4787 * @host: associated SCSI mid-layer structure
4788 * @host_set: Collection of hosts to which @ap belongs
4789 * @ent: Probe information provided by low-level driver
4790 * @port_no: Port number associated with this ata_port
4792 * Initialize a new ata_port structure, and its associated
4796 * Inherited from caller.
4799 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4800 struct ata_host_set
*host_set
,
4801 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4807 host
->max_channel
= 1;
4808 host
->unique_id
= ata_unique_id
++;
4809 host
->max_cmd_len
= 12;
4811 ap
->flags
= ATA_FLAG_DISABLED
;
4812 ap
->id
= host
->unique_id
;
4814 ap
->ctl
= ATA_DEVCTL_OBS
;
4815 ap
->host_set
= host_set
;
4817 ap
->port_no
= port_no
;
4819 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4820 ap
->pio_mask
= ent
->pio_mask
;
4821 ap
->mwdma_mask
= ent
->mwdma_mask
;
4822 ap
->udma_mask
= ent
->udma_mask
;
4823 ap
->flags
|= ent
->host_flags
;
4824 ap
->ops
= ent
->port_ops
;
4825 ap
->sata_spd_limit
= UINT_MAX
;
4826 ap
->active_tag
= ATA_TAG_POISON
;
4827 ap
->last_ctl
= 0xFF;
4829 INIT_WORK(&ap
->port_task
, NULL
, NULL
);
4830 INIT_LIST_HEAD(&ap
->eh_done_q
);
4832 /* set cable type */
4833 ap
->cbl
= ATA_CBL_NONE
;
4834 if (ap
->flags
& ATA_FLAG_SATA
)
4835 ap
->cbl
= ATA_CBL_SATA
;
4837 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
4838 struct ata_device
*dev
= &ap
->device
[i
];
4841 dev
->pio_mask
= UINT_MAX
;
4842 dev
->mwdma_mask
= UINT_MAX
;
4843 dev
->udma_mask
= UINT_MAX
;
4847 ap
->stats
.unhandled_irq
= 1;
4848 ap
->stats
.idle_irq
= 1;
4851 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4855 * ata_host_add - Attach low-level ATA driver to system
4856 * @ent: Information provided by low-level driver
4857 * @host_set: Collections of ports to which we add
4858 * @port_no: Port number associated with this host
4860 * Attach low-level ATA driver to system.
4863 * PCI/etc. bus probe sem.
4866 * New ata_port on success, for NULL on error.
4869 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4870 struct ata_host_set
*host_set
,
4871 unsigned int port_no
)
4873 struct Scsi_Host
*host
;
4874 struct ata_port
*ap
;
4879 if (!ent
->port_ops
->probe_reset
&&
4880 !(ent
->host_flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
))) {
4881 printk(KERN_ERR
"ata%u: no reset mechanism available\n",
4886 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4890 host
->transportt
= &ata_scsi_transport_template
;
4892 ap
= ata_shost_to_port(host
);
4894 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4896 rc
= ap
->ops
->port_start(ap
);
4903 scsi_host_put(host
);
4908 * ata_device_add - Register hardware device with ATA and SCSI layers
4909 * @ent: Probe information describing hardware device to be registered
4911 * This function processes the information provided in the probe
4912 * information struct @ent, allocates the necessary ATA and SCSI
4913 * host information structures, initializes them, and registers
4914 * everything with requisite kernel subsystems.
4916 * This function requests irqs, probes the ATA bus, and probes
4920 * PCI/etc. bus probe sem.
4923 * Number of ports registered. Zero on error (no ports registered).
4926 int ata_device_add(const struct ata_probe_ent
*ent
)
4928 unsigned int count
= 0, i
;
4929 struct device
*dev
= ent
->dev
;
4930 struct ata_host_set
*host_set
;
4933 /* alloc a container for our list of ATA ports (buses) */
4934 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4935 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4938 spin_lock_init(&host_set
->lock
);
4940 host_set
->dev
= dev
;
4941 host_set
->n_ports
= ent
->n_ports
;
4942 host_set
->irq
= ent
->irq
;
4943 host_set
->mmio_base
= ent
->mmio_base
;
4944 host_set
->private_data
= ent
->private_data
;
4945 host_set
->ops
= ent
->port_ops
;
4946 host_set
->flags
= ent
->host_set_flags
;
4948 /* register each port bound to this device */
4949 for (i
= 0; i
< ent
->n_ports
; i
++) {
4950 struct ata_port
*ap
;
4951 unsigned long xfer_mode_mask
;
4953 ap
= ata_host_add(ent
, host_set
, i
);
4957 host_set
->ports
[i
] = ap
;
4958 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4959 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4960 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4962 /* print per-port info to dmesg */
4963 ata_port_printk(ap
, KERN_INFO
, "%cATA max %s cmd 0x%lX "
4964 "ctl 0x%lX bmdma 0x%lX irq %lu\n",
4965 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4966 ata_mode_string(xfer_mode_mask
),
4967 ap
->ioaddr
.cmd_addr
,
4968 ap
->ioaddr
.ctl_addr
,
4969 ap
->ioaddr
.bmdma_addr
,
4973 host_set
->ops
->irq_clear(ap
);
4974 ata_eh_freeze_port(ap
); /* freeze port before requesting IRQ */
4981 /* obtain irq, that is shared between channels */
4982 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4983 DRV_NAME
, host_set
))
4986 /* perform each probe synchronously */
4987 DPRINTK("probe begin\n");
4988 for (i
= 0; i
< count
; i
++) {
4989 struct ata_port
*ap
;
4992 ap
= host_set
->ports
[i
];
4994 DPRINTK("ata%u: bus probe begin\n", ap
->id
);
4995 rc
= ata_bus_probe(ap
);
4996 DPRINTK("ata%u: bus probe end\n", ap
->id
);
4999 /* FIXME: do something useful here?
5000 * Current libata behavior will
5001 * tear down everything when
5002 * the module is removed
5003 * or the h/w is unplugged.
5007 rc
= scsi_add_host(ap
->host
, dev
);
5009 ata_port_printk(ap
, KERN_ERR
, "scsi_add_host failed\n");
5010 /* FIXME: do something useful here */
5011 /* FIXME: handle unconditional calls to
5012 * scsi_scan_host and ata_host_remove, below,
5018 /* probes are done, now scan each port's disk(s) */
5019 DPRINTK("host probe begin\n");
5020 for (i
= 0; i
< count
; i
++) {
5021 struct ata_port
*ap
= host_set
->ports
[i
];
5023 ata_scsi_scan_host(ap
);
5026 dev_set_drvdata(dev
, host_set
);
5028 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
5029 return ent
->n_ports
; /* success */
5032 for (i
= 0; i
< count
; i
++) {
5033 ata_host_remove(host_set
->ports
[i
], 1);
5034 scsi_host_put(host_set
->ports
[i
]->host
);
5038 VPRINTK("EXIT, returning 0\n");
5043 * ata_host_set_remove - PCI layer callback for device removal
5044 * @host_set: ATA host set that was removed
5046 * Unregister all objects associated with this host set. Free those
5050 * Inherited from calling layer (may sleep).
5053 void ata_host_set_remove(struct ata_host_set
*host_set
)
5055 struct ata_port
*ap
;
5058 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5059 ap
= host_set
->ports
[i
];
5060 scsi_remove_host(ap
->host
);
5063 free_irq(host_set
->irq
, host_set
);
5065 for (i
= 0; i
< host_set
->n_ports
; i
++) {
5066 ap
= host_set
->ports
[i
];
5068 ata_scsi_release(ap
->host
);
5070 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
5071 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
5073 if (ioaddr
->cmd_addr
== 0x1f0)
5074 release_region(0x1f0, 8);
5075 else if (ioaddr
->cmd_addr
== 0x170)
5076 release_region(0x170, 8);
5079 scsi_host_put(ap
->host
);
5082 if (host_set
->ops
->host_stop
)
5083 host_set
->ops
->host_stop(host_set
);
5089 * ata_scsi_release - SCSI layer callback hook for host unload
5090 * @host: libata host to be unloaded
5092 * Performs all duties necessary to shut down a libata port...
5093 * Kill port kthread, disable port, and release resources.
5096 * Inherited from SCSI layer.
5102 int ata_scsi_release(struct Scsi_Host
*host
)
5104 struct ata_port
*ap
= ata_shost_to_port(host
);
5108 ap
->ops
->port_disable(ap
);
5109 ata_host_remove(ap
, 0);
5116 * ata_std_ports - initialize ioaddr with standard port offsets.
5117 * @ioaddr: IO address structure to be initialized
5119 * Utility function which initializes data_addr, error_addr,
5120 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
5121 * device_addr, status_addr, and command_addr to standard offsets
5122 * relative to cmd_addr.
5124 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
5127 void ata_std_ports(struct ata_ioports
*ioaddr
)
5129 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
5130 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
5131 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
5132 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
5133 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
5134 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
5135 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
5136 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
5137 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
5138 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
5144 void ata_pci_host_stop (struct ata_host_set
*host_set
)
5146 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
5148 pci_iounmap(pdev
, host_set
->mmio_base
);
5152 * ata_pci_remove_one - PCI layer callback for device removal
5153 * @pdev: PCI device that was removed
5155 * PCI layer indicates to libata via this hook that
5156 * hot-unplug or module unload event has occurred.
5157 * Handle this by unregistering all objects associated
5158 * with this PCI device. Free those objects. Then finally
5159 * release PCI resources and disable device.
5162 * Inherited from PCI layer (may sleep).
5165 void ata_pci_remove_one (struct pci_dev
*pdev
)
5167 struct device
*dev
= pci_dev_to_dev(pdev
);
5168 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5170 ata_host_set_remove(host_set
);
5171 pci_release_regions(pdev
);
5172 pci_disable_device(pdev
);
5173 dev_set_drvdata(dev
, NULL
);
5176 /* move to PCI subsystem */
5177 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5179 unsigned long tmp
= 0;
5181 switch (bits
->width
) {
5184 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5190 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5196 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5207 return (tmp
== bits
->val
) ? 1 : 0;
5210 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5212 pci_save_state(pdev
);
5213 pci_disable_device(pdev
);
5214 pci_set_power_state(pdev
, PCI_D3hot
);
5218 int ata_pci_device_resume(struct pci_dev
*pdev
)
5220 pci_set_power_state(pdev
, PCI_D0
);
5221 pci_restore_state(pdev
);
5222 pci_enable_device(pdev
);
5223 pci_set_master(pdev
);
5226 #endif /* CONFIG_PCI */
5229 static int __init
ata_init(void)
5231 ata_wq
= create_workqueue("ata");
5235 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5239 static void __exit
ata_exit(void)
5241 destroy_workqueue(ata_wq
);
5244 module_init(ata_init
);
5245 module_exit(ata_exit
);
5247 static unsigned long ratelimit_time
;
5248 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5250 int ata_ratelimit(void)
5253 unsigned long flags
;
5255 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5257 if (time_after(jiffies
, ratelimit_time
)) {
5259 ratelimit_time
= jiffies
+ (HZ
/5);
5263 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5269 * ata_wait_register - wait until register value changes
5270 * @reg: IO-mapped register
5271 * @mask: Mask to apply to read register value
5272 * @val: Wait condition
5273 * @interval_msec: polling interval in milliseconds
5274 * @timeout_msec: timeout in milliseconds
5276 * Waiting for some bits of register to change is a common
5277 * operation for ATA controllers. This function reads 32bit LE
5278 * IO-mapped register @reg and tests for the following condition.
5280 * (*@reg & mask) != val
5282 * If the condition is met, it returns; otherwise, the process is
5283 * repeated after @interval_msec until timeout.
5286 * Kernel thread context (may sleep)
5289 * The final register value.
5291 u32
ata_wait_register(void __iomem
*reg
, u32 mask
, u32 val
,
5292 unsigned long interval_msec
,
5293 unsigned long timeout_msec
)
5295 unsigned long timeout
;
5298 tmp
= ioread32(reg
);
5300 /* Calculate timeout _after_ the first read to make sure
5301 * preceding writes reach the controller before starting to
5302 * eat away the timeout.
5304 timeout
= jiffies
+ (timeout_msec
* HZ
) / 1000;
5306 while ((tmp
& mask
) == val
&& time_before(jiffies
, timeout
)) {
5307 msleep(interval_msec
);
5308 tmp
= ioread32(reg
);
5315 * libata is essentially a library of internal helper functions for
5316 * low-level ATA host controller drivers. As such, the API/ABI is
5317 * likely to change as new drivers are added and updated.
5318 * Do not depend on ABI/API stability.
5321 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5322 EXPORT_SYMBOL_GPL(ata_std_ports
);
5323 EXPORT_SYMBOL_GPL(ata_device_add
);
5324 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5325 EXPORT_SYMBOL_GPL(ata_sg_init
);
5326 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5327 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5328 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5329 EXPORT_SYMBOL_GPL(ata_tf_load
);
5330 EXPORT_SYMBOL_GPL(ata_tf_read
);
5331 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5332 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5333 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5334 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5335 EXPORT_SYMBOL_GPL(ata_check_status
);
5336 EXPORT_SYMBOL_GPL(ata_altstatus
);
5337 EXPORT_SYMBOL_GPL(ata_exec_command
);
5338 EXPORT_SYMBOL_GPL(ata_port_start
);
5339 EXPORT_SYMBOL_GPL(ata_port_stop
);
5340 EXPORT_SYMBOL_GPL(ata_host_stop
);
5341 EXPORT_SYMBOL_GPL(ata_interrupt
);
5342 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5343 EXPORT_SYMBOL_GPL(ata_noop_qc_prep
);
5344 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5345 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5346 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5347 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5348 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5349 EXPORT_SYMBOL_GPL(ata_port_probe
);
5350 EXPORT_SYMBOL_GPL(sata_set_spd
);
5351 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5352 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5353 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5354 EXPORT_SYMBOL_GPL(ata_std_probeinit
);
5355 EXPORT_SYMBOL_GPL(ata_std_softreset
);
5356 EXPORT_SYMBOL_GPL(sata_std_hardreset
);
5357 EXPORT_SYMBOL_GPL(ata_std_postreset
);
5358 EXPORT_SYMBOL_GPL(ata_std_probe_reset
);
5359 EXPORT_SYMBOL_GPL(ata_drive_probe_reset
);
5360 EXPORT_SYMBOL_GPL(ata_dev_revalidate
);
5361 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5362 EXPORT_SYMBOL_GPL(ata_dev_pair
);
5363 EXPORT_SYMBOL_GPL(ata_port_disable
);
5364 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5365 EXPORT_SYMBOL_GPL(ata_wait_register
);
5366 EXPORT_SYMBOL_GPL(ata_busy_sleep
);
5367 EXPORT_SYMBOL_GPL(ata_port_queue_task
);
5368 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5369 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5370 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5371 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5372 EXPORT_SYMBOL_GPL(ata_host_intr
);
5373 EXPORT_SYMBOL_GPL(sata_scr_valid
);
5374 EXPORT_SYMBOL_GPL(sata_scr_read
);
5375 EXPORT_SYMBOL_GPL(sata_scr_write
);
5376 EXPORT_SYMBOL_GPL(sata_scr_write_flush
);
5377 EXPORT_SYMBOL_GPL(ata_port_online
);
5378 EXPORT_SYMBOL_GPL(ata_port_offline
);
5379 EXPORT_SYMBOL_GPL(ata_id_string
);
5380 EXPORT_SYMBOL_GPL(ata_id_c_string
);
5381 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5383 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5384 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5385 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5388 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5389 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5390 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5391 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5392 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5393 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5394 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5395 EXPORT_SYMBOL_GPL(ata_pci_default_filter
);
5396 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex
);
5397 #endif /* CONFIG_PCI */
5399 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5400 EXPORT_SYMBOL_GPL(ata_device_resume
);
5401 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5402 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);
5404 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5405 EXPORT_SYMBOL_GPL(ata_port_schedule_eh
);
5406 EXPORT_SYMBOL_GPL(ata_port_abort
);
5407 EXPORT_SYMBOL_GPL(ata_port_freeze
);
5408 EXPORT_SYMBOL_GPL(ata_eh_freeze_port
);
5409 EXPORT_SYMBOL_GPL(ata_eh_thaw_port
);
5410 EXPORT_SYMBOL_GPL(ata_eh_qc_complete
);
5411 EXPORT_SYMBOL_GPL(ata_eh_qc_retry
);