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_busy_sleep (struct ata_port
*ap
,
65 unsigned long tmout_pat
,
67 static void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
);
68 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
);
69 static void ata_set_mode(struct ata_port
*ap
);
70 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
);
71 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
);
72 static int fgb(u32 bitmap
);
73 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
75 unsigned int *xfer_shift_out
);
76 static void __ata_qc_complete(struct ata_queued_cmd
*qc
);
78 static unsigned int ata_unique_id
= 1;
79 static struct workqueue_struct
*ata_wq
;
81 int atapi_enabled
= 0;
82 module_param(atapi_enabled
, int, 0444);
83 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
85 MODULE_AUTHOR("Jeff Garzik");
86 MODULE_DESCRIPTION("Library module for ATA devices");
87 MODULE_LICENSE("GPL");
88 MODULE_VERSION(DRV_VERSION
);
91 * ata_tf_load_pio - send taskfile registers to host controller
92 * @ap: Port to which output is sent
93 * @tf: ATA taskfile register set
95 * Outputs ATA taskfile to standard ATA host controller.
98 * Inherited from caller.
101 static void ata_tf_load_pio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
103 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
104 unsigned int is_addr
= tf
->flags
& ATA_TFLAG_ISADDR
;
106 if (tf
->ctl
!= ap
->last_ctl
) {
107 outb(tf
->ctl
, ioaddr
->ctl_addr
);
108 ap
->last_ctl
= tf
->ctl
;
112 if (is_addr
&& (tf
->flags
& ATA_TFLAG_LBA48
)) {
113 outb(tf
->hob_feature
, ioaddr
->feature_addr
);
114 outb(tf
->hob_nsect
, ioaddr
->nsect_addr
);
115 outb(tf
->hob_lbal
, ioaddr
->lbal_addr
);
116 outb(tf
->hob_lbam
, ioaddr
->lbam_addr
);
117 outb(tf
->hob_lbah
, ioaddr
->lbah_addr
);
118 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
127 outb(tf
->feature
, ioaddr
->feature_addr
);
128 outb(tf
->nsect
, ioaddr
->nsect_addr
);
129 outb(tf
->lbal
, ioaddr
->lbal_addr
);
130 outb(tf
->lbam
, ioaddr
->lbam_addr
);
131 outb(tf
->lbah
, ioaddr
->lbah_addr
);
132 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
140 if (tf
->flags
& ATA_TFLAG_DEVICE
) {
141 outb(tf
->device
, ioaddr
->device_addr
);
142 VPRINTK("device 0x%X\n", tf
->device
);
149 * ata_tf_load_mmio - send taskfile registers to host controller
150 * @ap: Port to which output is sent
151 * @tf: ATA taskfile register set
153 * Outputs ATA taskfile to standard ATA host controller using MMIO.
156 * Inherited from caller.
159 static void ata_tf_load_mmio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
161 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
162 unsigned int is_addr
= tf
->flags
& ATA_TFLAG_ISADDR
;
164 if (tf
->ctl
!= ap
->last_ctl
) {
165 writeb(tf
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
166 ap
->last_ctl
= tf
->ctl
;
170 if (is_addr
&& (tf
->flags
& ATA_TFLAG_LBA48
)) {
171 writeb(tf
->hob_feature
, (void __iomem
*) ioaddr
->feature_addr
);
172 writeb(tf
->hob_nsect
, (void __iomem
*) ioaddr
->nsect_addr
);
173 writeb(tf
->hob_lbal
, (void __iomem
*) ioaddr
->lbal_addr
);
174 writeb(tf
->hob_lbam
, (void __iomem
*) ioaddr
->lbam_addr
);
175 writeb(tf
->hob_lbah
, (void __iomem
*) ioaddr
->lbah_addr
);
176 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
185 writeb(tf
->feature
, (void __iomem
*) ioaddr
->feature_addr
);
186 writeb(tf
->nsect
, (void __iomem
*) ioaddr
->nsect_addr
);
187 writeb(tf
->lbal
, (void __iomem
*) ioaddr
->lbal_addr
);
188 writeb(tf
->lbam
, (void __iomem
*) ioaddr
->lbam_addr
);
189 writeb(tf
->lbah
, (void __iomem
*) ioaddr
->lbah_addr
);
190 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
198 if (tf
->flags
& ATA_TFLAG_DEVICE
) {
199 writeb(tf
->device
, (void __iomem
*) ioaddr
->device_addr
);
200 VPRINTK("device 0x%X\n", tf
->device
);
208 * ata_tf_load - send taskfile registers to host controller
209 * @ap: Port to which output is sent
210 * @tf: ATA taskfile register set
212 * Outputs ATA taskfile to standard ATA host controller using MMIO
213 * or PIO as indicated by the ATA_FLAG_MMIO flag.
214 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
215 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
216 * hob_lbal, hob_lbam, and hob_lbah.
218 * This function waits for idle (!BUSY and !DRQ) after writing
219 * registers. If the control register has a new value, this
220 * function also waits for idle after writing control and before
221 * writing the remaining registers.
223 * May be used as the tf_load() entry in ata_port_operations.
226 * Inherited from caller.
228 void ata_tf_load(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
230 if (ap
->flags
& ATA_FLAG_MMIO
)
231 ata_tf_load_mmio(ap
, tf
);
233 ata_tf_load_pio(ap
, tf
);
237 * ata_exec_command_pio - issue ATA command to host controller
238 * @ap: port to which command is being issued
239 * @tf: ATA taskfile register set
241 * Issues PIO write to ATA command register, with proper
242 * synchronization with interrupt handler / other threads.
245 * spin_lock_irqsave(host_set lock)
248 static void ata_exec_command_pio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
250 DPRINTK("ata%u: cmd 0x%X\n", ap
->id
, tf
->command
);
252 outb(tf
->command
, ap
->ioaddr
.command_addr
);
258 * ata_exec_command_mmio - issue ATA command to host controller
259 * @ap: port to which command is being issued
260 * @tf: ATA taskfile register set
262 * Issues MMIO write to ATA command register, with proper
263 * synchronization with interrupt handler / other threads.
266 * spin_lock_irqsave(host_set lock)
269 static void ata_exec_command_mmio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
271 DPRINTK("ata%u: cmd 0x%X\n", ap
->id
, tf
->command
);
273 writeb(tf
->command
, (void __iomem
*) ap
->ioaddr
.command_addr
);
279 * ata_exec_command - issue ATA command to host controller
280 * @ap: port to which command is being issued
281 * @tf: ATA taskfile register set
283 * Issues PIO/MMIO write to ATA command register, with proper
284 * synchronization with interrupt handler / other threads.
287 * spin_lock_irqsave(host_set lock)
289 void ata_exec_command(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
291 if (ap
->flags
& ATA_FLAG_MMIO
)
292 ata_exec_command_mmio(ap
, tf
);
294 ata_exec_command_pio(ap
, tf
);
298 * ata_tf_to_host - issue ATA taskfile to host controller
299 * @ap: port to which command is being issued
300 * @tf: ATA taskfile register set
302 * Issues ATA taskfile register set to ATA host controller,
303 * with proper synchronization with interrupt handler and
307 * spin_lock_irqsave(host_set lock)
310 static inline void ata_tf_to_host(struct ata_port
*ap
,
311 const struct ata_taskfile
*tf
)
313 ap
->ops
->tf_load(ap
, tf
);
314 ap
->ops
->exec_command(ap
, tf
);
318 * ata_tf_read_pio - input device's ATA taskfile shadow registers
319 * @ap: Port from which input is read
320 * @tf: ATA taskfile register set for storing input
322 * Reads ATA taskfile registers for currently-selected device
326 * Inherited from caller.
329 static void ata_tf_read_pio(struct ata_port
*ap
, struct ata_taskfile
*tf
)
331 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
333 tf
->command
= ata_check_status(ap
);
334 tf
->feature
= inb(ioaddr
->error_addr
);
335 tf
->nsect
= inb(ioaddr
->nsect_addr
);
336 tf
->lbal
= inb(ioaddr
->lbal_addr
);
337 tf
->lbam
= inb(ioaddr
->lbam_addr
);
338 tf
->lbah
= inb(ioaddr
->lbah_addr
);
339 tf
->device
= inb(ioaddr
->device_addr
);
341 if (tf
->flags
& ATA_TFLAG_LBA48
) {
342 outb(tf
->ctl
| ATA_HOB
, ioaddr
->ctl_addr
);
343 tf
->hob_feature
= inb(ioaddr
->error_addr
);
344 tf
->hob_nsect
= inb(ioaddr
->nsect_addr
);
345 tf
->hob_lbal
= inb(ioaddr
->lbal_addr
);
346 tf
->hob_lbam
= inb(ioaddr
->lbam_addr
);
347 tf
->hob_lbah
= inb(ioaddr
->lbah_addr
);
352 * ata_tf_read_mmio - input device's ATA taskfile shadow registers
353 * @ap: Port from which input is read
354 * @tf: ATA taskfile register set for storing input
356 * Reads ATA taskfile registers for currently-selected device
360 * Inherited from caller.
363 static void ata_tf_read_mmio(struct ata_port
*ap
, struct ata_taskfile
*tf
)
365 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
367 tf
->command
= ata_check_status(ap
);
368 tf
->feature
= readb((void __iomem
*)ioaddr
->error_addr
);
369 tf
->nsect
= readb((void __iomem
*)ioaddr
->nsect_addr
);
370 tf
->lbal
= readb((void __iomem
*)ioaddr
->lbal_addr
);
371 tf
->lbam
= readb((void __iomem
*)ioaddr
->lbam_addr
);
372 tf
->lbah
= readb((void __iomem
*)ioaddr
->lbah_addr
);
373 tf
->device
= readb((void __iomem
*)ioaddr
->device_addr
);
375 if (tf
->flags
& ATA_TFLAG_LBA48
) {
376 writeb(tf
->ctl
| ATA_HOB
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
377 tf
->hob_feature
= readb((void __iomem
*)ioaddr
->error_addr
);
378 tf
->hob_nsect
= readb((void __iomem
*)ioaddr
->nsect_addr
);
379 tf
->hob_lbal
= readb((void __iomem
*)ioaddr
->lbal_addr
);
380 tf
->hob_lbam
= readb((void __iomem
*)ioaddr
->lbam_addr
);
381 tf
->hob_lbah
= readb((void __iomem
*)ioaddr
->lbah_addr
);
387 * ata_tf_read - input device's ATA taskfile shadow registers
388 * @ap: Port from which input is read
389 * @tf: ATA taskfile register set for storing input
391 * Reads ATA taskfile registers for currently-selected device
394 * Reads nsect, lbal, lbam, lbah, and device. If ATA_TFLAG_LBA48
395 * is set, also reads the hob registers.
397 * May be used as the tf_read() entry in ata_port_operations.
400 * Inherited from caller.
402 void ata_tf_read(struct ata_port
*ap
, struct ata_taskfile
*tf
)
404 if (ap
->flags
& ATA_FLAG_MMIO
)
405 ata_tf_read_mmio(ap
, tf
);
407 ata_tf_read_pio(ap
, tf
);
411 * ata_check_status_pio - Read device status reg & clear interrupt
412 * @ap: port where the device is
414 * Reads ATA taskfile status register for currently-selected device
415 * and return its value. This also clears pending interrupts
419 * Inherited from caller.
421 static u8
ata_check_status_pio(struct ata_port
*ap
)
423 return inb(ap
->ioaddr
.status_addr
);
427 * ata_check_status_mmio - Read device status reg & clear interrupt
428 * @ap: port where the device is
430 * Reads ATA taskfile status register for currently-selected device
431 * via MMIO and return its value. This also clears pending interrupts
435 * Inherited from caller.
437 static u8
ata_check_status_mmio(struct ata_port
*ap
)
439 return readb((void __iomem
*) ap
->ioaddr
.status_addr
);
444 * ata_check_status - Read device status reg & clear interrupt
445 * @ap: port where the device is
447 * Reads ATA taskfile status register for currently-selected device
448 * and return its value. This also clears pending interrupts
451 * May be used as the check_status() entry in ata_port_operations.
454 * Inherited from caller.
456 u8
ata_check_status(struct ata_port
*ap
)
458 if (ap
->flags
& ATA_FLAG_MMIO
)
459 return ata_check_status_mmio(ap
);
460 return ata_check_status_pio(ap
);
465 * ata_altstatus - Read device alternate status reg
466 * @ap: port where the device is
468 * Reads ATA taskfile alternate status register for
469 * currently-selected device and return its value.
471 * Note: may NOT be used as the check_altstatus() entry in
472 * ata_port_operations.
475 * Inherited from caller.
477 u8
ata_altstatus(struct ata_port
*ap
)
479 if (ap
->ops
->check_altstatus
)
480 return ap
->ops
->check_altstatus(ap
);
482 if (ap
->flags
& ATA_FLAG_MMIO
)
483 return readb((void __iomem
*)ap
->ioaddr
.altstatus_addr
);
484 return inb(ap
->ioaddr
.altstatus_addr
);
489 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
490 * @tf: Taskfile to convert
491 * @fis: Buffer into which data will output
492 * @pmp: Port multiplier port
494 * Converts a standard ATA taskfile to a Serial ATA
495 * FIS structure (Register - Host to Device).
498 * Inherited from caller.
501 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
503 fis
[0] = 0x27; /* Register - Host to Device FIS */
504 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
505 bit 7 indicates Command FIS */
506 fis
[2] = tf
->command
;
507 fis
[3] = tf
->feature
;
514 fis
[8] = tf
->hob_lbal
;
515 fis
[9] = tf
->hob_lbam
;
516 fis
[10] = tf
->hob_lbah
;
517 fis
[11] = tf
->hob_feature
;
520 fis
[13] = tf
->hob_nsect
;
531 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
532 * @fis: Buffer from which data will be input
533 * @tf: Taskfile to output
535 * Converts a serial ATA FIS structure to a standard ATA taskfile.
538 * Inherited from caller.
541 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
543 tf
->command
= fis
[2]; /* status */
544 tf
->feature
= fis
[3]; /* error */
551 tf
->hob_lbal
= fis
[8];
552 tf
->hob_lbam
= fis
[9];
553 tf
->hob_lbah
= fis
[10];
556 tf
->hob_nsect
= fis
[13];
559 static const u8 ata_rw_cmds
[] = {
563 ATA_CMD_READ_MULTI_EXT
,
564 ATA_CMD_WRITE_MULTI_EXT
,
568 ATA_CMD_PIO_READ_EXT
,
569 ATA_CMD_PIO_WRITE_EXT
,
578 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
579 * @qc: command to examine and configure
581 * Examine the device configuration and tf->flags to calculate
582 * the proper read/write commands and protocol to use.
587 void ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
589 struct ata_taskfile
*tf
= &qc
->tf
;
590 struct ata_device
*dev
= qc
->dev
;
592 int index
, lba48
, write
;
594 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
595 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
597 if (dev
->flags
& ATA_DFLAG_PIO
) {
598 tf
->protocol
= ATA_PROT_PIO
;
599 index
= dev
->multi_count
? 0 : 4;
601 tf
->protocol
= ATA_PROT_DMA
;
605 tf
->command
= ata_rw_cmds
[index
+ lba48
+ write
];
608 static const char * const xfer_mode_str
[] = {
628 * ata_udma_string - convert UDMA bit offset to string
629 * @mask: mask of bits supported; only highest bit counts.
631 * Determine string which represents the highest speed
632 * (highest bit in @udma_mask).
638 * Constant C string representing highest speed listed in
639 * @udma_mask, or the constant C string "<n/a>".
642 static const char *ata_mode_string(unsigned int mask
)
646 for (i
= 7; i
>= 0; i
--)
649 for (i
= ATA_SHIFT_MWDMA
+ 2; i
>= ATA_SHIFT_MWDMA
; i
--)
652 for (i
= ATA_SHIFT_PIO
+ 4; i
>= ATA_SHIFT_PIO
; i
--)
659 return xfer_mode_str
[i
];
663 * ata_pio_devchk - PATA device presence detection
664 * @ap: ATA channel to examine
665 * @device: Device to examine (starting at zero)
667 * This technique was originally described in
668 * Hale Landis's ATADRVR (www.ata-atapi.com), and
669 * later found its way into the ATA/ATAPI spec.
671 * Write a pattern to the ATA shadow registers,
672 * and if a device is present, it will respond by
673 * correctly storing and echoing back the
674 * ATA shadow register contents.
680 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
683 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
686 ap
->ops
->dev_select(ap
, device
);
688 outb(0x55, ioaddr
->nsect_addr
);
689 outb(0xaa, ioaddr
->lbal_addr
);
691 outb(0xaa, ioaddr
->nsect_addr
);
692 outb(0x55, ioaddr
->lbal_addr
);
694 outb(0x55, ioaddr
->nsect_addr
);
695 outb(0xaa, ioaddr
->lbal_addr
);
697 nsect
= inb(ioaddr
->nsect_addr
);
698 lbal
= inb(ioaddr
->lbal_addr
);
700 if ((nsect
== 0x55) && (lbal
== 0xaa))
701 return 1; /* we found a device */
703 return 0; /* nothing found */
707 * ata_mmio_devchk - PATA device presence detection
708 * @ap: ATA channel to examine
709 * @device: Device to examine (starting at zero)
711 * This technique was originally described in
712 * Hale Landis's ATADRVR (www.ata-atapi.com), and
713 * later found its way into the ATA/ATAPI spec.
715 * Write a pattern to the ATA shadow registers,
716 * and if a device is present, it will respond by
717 * correctly storing and echoing back the
718 * ATA shadow register contents.
724 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
727 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
730 ap
->ops
->dev_select(ap
, device
);
732 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
733 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
735 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
736 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
738 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
739 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
741 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
742 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
744 if ((nsect
== 0x55) && (lbal
== 0xaa))
745 return 1; /* we found a device */
747 return 0; /* nothing found */
751 * ata_devchk - PATA device presence detection
752 * @ap: ATA channel to examine
753 * @device: Device to examine (starting at zero)
755 * Dispatch ATA device presence detection, depending
756 * on whether we are using PIO or MMIO to talk to the
757 * ATA shadow registers.
763 static unsigned int ata_devchk(struct ata_port
*ap
,
766 if (ap
->flags
& ATA_FLAG_MMIO
)
767 return ata_mmio_devchk(ap
, device
);
768 return ata_pio_devchk(ap
, device
);
772 * ata_dev_classify - determine device type based on ATA-spec signature
773 * @tf: ATA taskfile register set for device to be identified
775 * Determine from taskfile register contents whether a device is
776 * ATA or ATAPI, as per "Signature and persistence" section
777 * of ATA/PI spec (volume 1, sect 5.14).
783 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
784 * the event of failure.
787 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
789 /* Apple's open source Darwin code hints that some devices only
790 * put a proper signature into the LBA mid/high registers,
791 * So, we only check those. It's sufficient for uniqueness.
794 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
795 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
796 DPRINTK("found ATA device by sig\n");
800 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
801 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
802 DPRINTK("found ATAPI device by sig\n");
803 return ATA_DEV_ATAPI
;
806 DPRINTK("unknown device\n");
807 return ATA_DEV_UNKNOWN
;
811 * ata_dev_try_classify - Parse returned ATA device signature
812 * @ap: ATA channel to examine
813 * @device: Device to examine (starting at zero)
815 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
816 * an ATA/ATAPI-defined set of values is placed in the ATA
817 * shadow registers, indicating the results of device detection
820 * Select the ATA device, and read the values from the ATA shadow
821 * registers. Then parse according to the Error register value,
822 * and the spec-defined values examined by ata_dev_classify().
828 static u8
ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
)
830 struct ata_device
*dev
= &ap
->device
[device
];
831 struct ata_taskfile tf
;
835 ap
->ops
->dev_select(ap
, device
);
837 memset(&tf
, 0, sizeof(tf
));
839 ap
->ops
->tf_read(ap
, &tf
);
842 dev
->class = ATA_DEV_NONE
;
844 /* see if device passed diags */
847 else if ((device
== 0) && (err
== 0x81))
852 /* determine if device if ATA or ATAPI */
853 class = ata_dev_classify(&tf
);
854 if (class == ATA_DEV_UNKNOWN
)
856 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
865 * ata_dev_id_string - Convert IDENTIFY DEVICE page into string
866 * @id: IDENTIFY DEVICE results we will examine
867 * @s: string into which data is output
868 * @ofs: offset into identify device page
869 * @len: length of string to return. must be an even number.
871 * The strings in the IDENTIFY DEVICE page are broken up into
872 * 16-bit chunks. Run through the string, and output each
873 * 8-bit chunk linearly, regardless of platform.
879 void ata_dev_id_string(const u16
*id
, unsigned char *s
,
880 unsigned int ofs
, unsigned int len
)
900 * ata_noop_dev_select - Select device 0/1 on ATA bus
901 * @ap: ATA channel to manipulate
902 * @device: ATA device (numbered from zero) to select
904 * This function performs no actual function.
906 * May be used as the dev_select() entry in ata_port_operations.
911 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
917 * ata_std_dev_select - Select device 0/1 on ATA bus
918 * @ap: ATA channel to manipulate
919 * @device: ATA device (numbered from zero) to select
921 * Use the method defined in the ATA specification to
922 * make either device 0, or device 1, active on the
923 * ATA channel. Works with both PIO and MMIO.
925 * May be used as the dev_select() entry in ata_port_operations.
931 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
936 tmp
= ATA_DEVICE_OBS
;
938 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
940 if (ap
->flags
& ATA_FLAG_MMIO
) {
941 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
943 outb(tmp
, ap
->ioaddr
.device_addr
);
945 ata_pause(ap
); /* needed; also flushes, for mmio */
949 * ata_dev_select - Select device 0/1 on ATA bus
950 * @ap: ATA channel to manipulate
951 * @device: ATA device (numbered from zero) to select
952 * @wait: non-zero to wait for Status register BSY bit to clear
953 * @can_sleep: non-zero if context allows sleeping
955 * Use the method defined in the ATA specification to
956 * make either device 0, or device 1, active on the
959 * This is a high-level version of ata_std_dev_select(),
960 * which additionally provides the services of inserting
961 * the proper pauses and status polling, where needed.
967 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
968 unsigned int wait
, unsigned int can_sleep
)
970 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
971 ap
->id
, device
, wait
);
976 ap
->ops
->dev_select(ap
, device
);
979 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
986 * ata_dump_id - IDENTIFY DEVICE info debugging output
987 * @dev: Device whose IDENTIFY DEVICE page we will dump
989 * Dump selected 16-bit words from a detected device's
990 * IDENTIFY PAGE page.
996 static inline void ata_dump_id(const struct ata_device
*dev
)
998 DPRINTK("49==0x%04x "
1008 DPRINTK("80==0x%04x "
1018 DPRINTK("88==0x%04x "
1025 * Compute the PIO modes available for this device. This is not as
1026 * trivial as it seems if we must consider early devices correctly.
1028 * FIXME: pre IDE drive timing (do we care ?).
1031 static unsigned int ata_pio_modes(const struct ata_device
*adev
)
1035 /* Usual case. Word 53 indicates word 88 is valid */
1036 if (adev
->id
[ATA_ID_FIELD_VALID
] & (1 << 2)) {
1037 modes
= adev
->id
[ATA_ID_PIO_MODES
] & 0x03;
1043 /* If word 88 isn't valid then Word 51 holds the PIO timing number
1044 for the maximum. Turn it into a mask and return it */
1045 modes
= (2 << (adev
->id
[ATA_ID_OLD_PIO_MODES
] & 0xFF)) - 1 ;
1049 static int ata_qc_wait_err(struct ata_queued_cmd
*qc
,
1050 struct completion
*wait
)
1054 if (wait_for_completion_timeout(wait
, 30 * HZ
) < 1) {
1055 /* timeout handling */
1056 qc
->err_mask
|= ac_err_mask(ata_chk_status(qc
->ap
));
1058 if (!qc
->err_mask
) {
1059 printk(KERN_WARNING
"ata%u: slow completion (cmd %x)\n",
1060 qc
->ap
->id
, qc
->tf
.command
);
1062 printk(KERN_WARNING
"ata%u: qc timeout (cmd %x)\n",
1063 qc
->ap
->id
, qc
->tf
.command
);
1067 ata_qc_complete(qc
);
1074 * ata_dev_identify - obtain IDENTIFY x DEVICE page
1075 * @ap: port on which device we wish to probe resides
1076 * @device: device bus address, starting at zero
1078 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
1079 * command, and read back the 512-byte device information page.
1080 * The device information page is fed to us via the standard
1081 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
1082 * using standard PIO-IN paths)
1084 * After reading the device information page, we use several
1085 * bits of information from it to initialize data structures
1086 * that will be used during the lifetime of the ata_device.
1087 * Other data from the info page is used to disqualify certain
1088 * older ATA devices we do not wish to support.
1091 * Inherited from caller. Some functions called by this function
1092 * obtain the host_set lock.
1095 static void ata_dev_identify(struct ata_port
*ap
, unsigned int device
)
1097 struct ata_device
*dev
= &ap
->device
[device
];
1098 unsigned int major_version
;
1100 unsigned long xfer_modes
;
1101 unsigned int using_edd
;
1102 DECLARE_COMPLETION(wait
);
1103 struct ata_queued_cmd
*qc
;
1104 unsigned long flags
;
1107 if (!ata_dev_present(dev
)) {
1108 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1113 if (ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
1118 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, device
);
1120 assert (dev
->class == ATA_DEV_ATA
|| dev
->class == ATA_DEV_ATAPI
||
1121 dev
->class == ATA_DEV_NONE
);
1123 ata_dev_select(ap
, device
, 1, 1); /* select device 0/1 */
1125 qc
= ata_qc_new_init(ap
, dev
);
1128 ata_sg_init_one(qc
, dev
->id
, sizeof(dev
->id
));
1129 qc
->dma_dir
= DMA_FROM_DEVICE
;
1130 qc
->tf
.protocol
= ATA_PROT_PIO
;
1134 if (dev
->class == ATA_DEV_ATA
) {
1135 qc
->tf
.command
= ATA_CMD_ID_ATA
;
1136 DPRINTK("do ATA identify\n");
1138 qc
->tf
.command
= ATA_CMD_ID_ATAPI
;
1139 DPRINTK("do ATAPI identify\n");
1142 qc
->waiting
= &wait
;
1143 qc
->complete_fn
= ata_qc_complete_noop
;
1145 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1146 rc
= ata_qc_issue(qc
);
1147 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1152 ata_qc_wait_err(qc
, &wait
);
1154 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1155 ap
->ops
->tf_read(ap
, &qc
->tf
);
1156 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1158 if (qc
->tf
.command
& ATA_ERR
) {
1160 * arg! EDD works for all test cases, but seems to return
1161 * the ATA signature for some ATAPI devices. Until the
1162 * reason for this is found and fixed, we fix up the mess
1163 * here. If IDENTIFY DEVICE returns command aborted
1164 * (as ATAPI devices do), then we issue an
1165 * IDENTIFY PACKET DEVICE.
1167 * ATA software reset (SRST, the default) does not appear
1168 * to have this problem.
1170 if ((using_edd
) && (dev
->class == ATA_DEV_ATA
)) {
1171 u8 err
= qc
->tf
.feature
;
1172 if (err
& ATA_ABORTED
) {
1173 dev
->class = ATA_DEV_ATAPI
;
1185 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
1187 /* print device capabilities */
1188 printk(KERN_DEBUG
"ata%u: dev %u cfg "
1189 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1190 ap
->id
, device
, dev
->id
[49],
1191 dev
->id
[82], dev
->id
[83], dev
->id
[84],
1192 dev
->id
[85], dev
->id
[86], dev
->id
[87],
1196 * common ATA, ATAPI feature tests
1199 /* we require DMA support (bits 8 of word 49) */
1200 if (!ata_id_has_dma(dev
->id
)) {
1201 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1205 /* quick-n-dirty find max transfer mode; for printk only */
1206 xfer_modes
= dev
->id
[ATA_ID_UDMA_MODES
];
1208 xfer_modes
= (dev
->id
[ATA_ID_MWDMA_MODES
]) << ATA_SHIFT_MWDMA
;
1210 xfer_modes
= ata_pio_modes(dev
);
1214 /* ATA-specific feature tests */
1215 if (dev
->class == ATA_DEV_ATA
) {
1216 if (!ata_id_is_ata(dev
->id
)) /* sanity check */
1219 /* get major version */
1220 tmp
= dev
->id
[ATA_ID_MAJOR_VER
];
1221 for (major_version
= 14; major_version
>= 1; major_version
--)
1222 if (tmp
& (1 << major_version
))
1226 * The exact sequence expected by certain pre-ATA4 drives is:
1229 * INITIALIZE DEVICE PARAMETERS
1231 * Some drives were very specific about that exact sequence.
1233 if (major_version
< 4 || (!ata_id_has_lba(dev
->id
))) {
1234 ata_dev_init_params(ap
, dev
);
1236 /* current CHS translation info (id[53-58]) might be
1237 * changed. reread the identify device info.
1239 ata_dev_reread_id(ap
, dev
);
1242 if (ata_id_has_lba(dev
->id
)) {
1243 dev
->flags
|= ATA_DFLAG_LBA
;
1245 if (ata_id_has_lba48(dev
->id
)) {
1246 dev
->flags
|= ATA_DFLAG_LBA48
;
1247 dev
->n_sectors
= ata_id_u64(dev
->id
, 100);
1249 dev
->n_sectors
= ata_id_u32(dev
->id
, 60);
1252 /* print device info to dmesg */
1253 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1256 ata_mode_string(xfer_modes
),
1257 (unsigned long long)dev
->n_sectors
,
1258 dev
->flags
& ATA_DFLAG_LBA48
? " LBA48" : " LBA");
1262 /* Default translation */
1263 dev
->cylinders
= dev
->id
[1];
1264 dev
->heads
= dev
->id
[3];
1265 dev
->sectors
= dev
->id
[6];
1266 dev
->n_sectors
= dev
->cylinders
* dev
->heads
* dev
->sectors
;
1268 if (ata_id_current_chs_valid(dev
->id
)) {
1269 /* Current CHS translation is valid. */
1270 dev
->cylinders
= dev
->id
[54];
1271 dev
->heads
= dev
->id
[55];
1272 dev
->sectors
= dev
->id
[56];
1274 dev
->n_sectors
= ata_id_u32(dev
->id
, 57);
1277 /* print device info to dmesg */
1278 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1281 ata_mode_string(xfer_modes
),
1282 (unsigned long long)dev
->n_sectors
,
1283 (int)dev
->cylinders
, (int)dev
->heads
, (int)dev
->sectors
);
1287 ap
->host
->max_cmd_len
= 16;
1290 /* ATAPI-specific feature tests */
1291 else if (dev
->class == ATA_DEV_ATAPI
) {
1292 if (ata_id_is_ata(dev
->id
)) /* sanity check */
1295 rc
= atapi_cdb_len(dev
->id
);
1296 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1297 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1300 ap
->cdb_len
= (unsigned int) rc
;
1301 ap
->host
->max_cmd_len
= (unsigned char) ap
->cdb_len
;
1303 /* print device info to dmesg */
1304 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1306 ata_mode_string(xfer_modes
));
1309 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1313 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1316 dev
->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1317 DPRINTK("EXIT, err\n");
1321 static inline u8
ata_dev_knobble(const struct ata_port
*ap
)
1323 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(ap
->device
->id
)));
1327 * ata_dev_config - Run device specific handlers and check for
1328 * SATA->PATA bridges
1335 void ata_dev_config(struct ata_port
*ap
, unsigned int i
)
1337 /* limit bridge transfers to udma5, 200 sectors */
1338 if (ata_dev_knobble(ap
)) {
1339 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1340 ap
->id
, ap
->device
->devno
);
1341 ap
->udma_mask
&= ATA_UDMA5
;
1342 ap
->host
->max_sectors
= ATA_MAX_SECTORS
;
1343 ap
->host
->hostt
->max_sectors
= ATA_MAX_SECTORS
;
1344 ap
->device
->flags
|= ATA_DFLAG_LOCK_SECTORS
;
1347 if (ap
->ops
->dev_config
)
1348 ap
->ops
->dev_config(ap
, &ap
->device
[i
]);
1352 * ata_bus_probe - Reset and probe ATA bus
1355 * Master ATA bus probing function. Initiates a hardware-dependent
1356 * bus reset, then attempts to identify any devices found on
1360 * PCI/etc. bus probe sem.
1363 * Zero on success, non-zero on error.
1366 static int ata_bus_probe(struct ata_port
*ap
)
1368 unsigned int i
, found
= 0;
1370 ap
->ops
->phy_reset(ap
);
1371 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1374 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1375 ata_dev_identify(ap
, i
);
1376 if (ata_dev_present(&ap
->device
[i
])) {
1378 ata_dev_config(ap
,i
);
1382 if ((!found
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1383 goto err_out_disable
;
1386 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1387 goto err_out_disable
;
1392 ap
->ops
->port_disable(ap
);
1398 * ata_port_probe - Mark port as enabled
1399 * @ap: Port for which we indicate enablement
1401 * Modify @ap data structure such that the system
1402 * thinks that the entire port is enabled.
1404 * LOCKING: host_set lock, or some other form of
1408 void ata_port_probe(struct ata_port
*ap
)
1410 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1414 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1415 * @ap: SATA port associated with target SATA PHY.
1417 * This function issues commands to standard SATA Sxxx
1418 * PHY registers, to wake up the phy (and device), and
1419 * clear any reset condition.
1422 * PCI/etc. bus probe sem.
1425 void __sata_phy_reset(struct ata_port
*ap
)
1428 unsigned long timeout
= jiffies
+ (HZ
* 5);
1430 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1431 /* issue phy wake/reset */
1432 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1433 /* Couldn't find anything in SATA I/II specs, but
1434 * AHCI-1.1 10.4.2 says at least 1 ms. */
1437 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1439 /* wait for phy to become ready, if necessary */
1442 sstatus
= scr_read(ap
, SCR_STATUS
);
1443 if ((sstatus
& 0xf) != 1)
1445 } while (time_before(jiffies
, timeout
));
1447 /* TODO: phy layer with polling, timeouts, etc. */
1448 sstatus
= scr_read(ap
, SCR_STATUS
);
1449 if (sata_dev_present(ap
)) {
1453 tmp
= (sstatus
>> 4) & 0xf;
1456 else if (tmp
& (1 << 1))
1459 speed
= "<unknown>";
1460 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1461 ap
->id
, speed
, sstatus
);
1464 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1466 ata_port_disable(ap
);
1469 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1472 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1473 ata_port_disable(ap
);
1477 ap
->cbl
= ATA_CBL_SATA
;
1481 * sata_phy_reset - Reset SATA bus.
1482 * @ap: SATA port associated with target SATA PHY.
1484 * This function resets the SATA bus, and then probes
1485 * the bus for devices.
1488 * PCI/etc. bus probe sem.
1491 void sata_phy_reset(struct ata_port
*ap
)
1493 __sata_phy_reset(ap
);
1494 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1500 * ata_port_disable - Disable port.
1501 * @ap: Port to be disabled.
1503 * Modify @ap data structure such that the system
1504 * thinks that the entire port is disabled, and should
1505 * never attempt to probe or communicate with devices
1508 * LOCKING: host_set lock, or some other form of
1512 void ata_port_disable(struct ata_port
*ap
)
1514 ap
->device
[0].class = ATA_DEV_NONE
;
1515 ap
->device
[1].class = ATA_DEV_NONE
;
1516 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1520 * This mode timing computation functionality is ported over from
1521 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1524 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1525 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1526 * for PIO 5, which is a nonstandard extension and UDMA6, which
1527 * is currently supported only by Maxtor drives.
1530 static const struct ata_timing ata_timing
[] = {
1532 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1533 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1534 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1535 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1537 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1538 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1539 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1541 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1543 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1544 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1545 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1547 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1548 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1549 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1551 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1552 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1553 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1555 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1556 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1557 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1559 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1564 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1565 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1567 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1569 q
->setup
= EZ(t
->setup
* 1000, T
);
1570 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1571 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1572 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1573 q
->active
= EZ(t
->active
* 1000, T
);
1574 q
->recover
= EZ(t
->recover
* 1000, T
);
1575 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1576 q
->udma
= EZ(t
->udma
* 1000, UT
);
1579 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1580 struct ata_timing
*m
, unsigned int what
)
1582 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1583 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1584 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1585 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1586 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1587 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1588 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1589 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1592 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1594 const struct ata_timing
*t
;
1596 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1597 if (t
->mode
== 0xFF)
1602 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1603 struct ata_timing
*t
, int T
, int UT
)
1605 const struct ata_timing
*s
;
1606 struct ata_timing p
;
1612 if (!(s
= ata_timing_find_mode(speed
)))
1615 memcpy(t
, s
, sizeof(*s
));
1618 * If the drive is an EIDE drive, it can tell us it needs extended
1619 * PIO/MW_DMA cycle timing.
1622 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1623 memset(&p
, 0, sizeof(p
));
1624 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1625 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1626 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1627 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1628 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1630 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1634 * Convert the timing to bus clock counts.
1637 ata_timing_quantize(t
, t
, T
, UT
);
1640 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY, S.M.A.R.T
1641 * and some other commands. We have to ensure that the DMA cycle timing is
1642 * slower/equal than the fastest PIO timing.
1645 if (speed
> XFER_PIO_4
) {
1646 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1647 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1651 * Lenghten active & recovery time so that cycle time is correct.
1654 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1655 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1656 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1659 if (t
->active
+ t
->recover
< t
->cycle
) {
1660 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1661 t
->recover
= t
->cycle
- t
->active
;
1667 static const struct {
1670 } xfer_mode_classes
[] = {
1671 { ATA_SHIFT_UDMA
, XFER_UDMA_0
},
1672 { ATA_SHIFT_MWDMA
, XFER_MW_DMA_0
},
1673 { ATA_SHIFT_PIO
, XFER_PIO_0
},
1676 static inline u8
base_from_shift(unsigned int shift
)
1680 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++)
1681 if (xfer_mode_classes
[i
].shift
== shift
)
1682 return xfer_mode_classes
[i
].base
;
1687 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1692 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1695 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1696 dev
->flags
|= ATA_DFLAG_PIO
;
1698 ata_dev_set_xfermode(ap
, dev
);
1700 base
= base_from_shift(dev
->xfer_shift
);
1701 ofs
= dev
->xfer_mode
- base
;
1702 idx
= ofs
+ dev
->xfer_shift
;
1703 WARN_ON(idx
>= ARRAY_SIZE(xfer_mode_str
));
1705 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1706 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1708 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1709 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1712 static int ata_host_set_pio(struct ata_port
*ap
)
1718 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1721 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1725 base
= base_from_shift(ATA_SHIFT_PIO
);
1726 xfer_mode
= base
+ x
;
1728 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1729 (int)base
, (int)xfer_mode
, mask
, x
);
1731 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1732 struct ata_device
*dev
= &ap
->device
[i
];
1733 if (ata_dev_present(dev
)) {
1734 dev
->pio_mode
= xfer_mode
;
1735 dev
->xfer_mode
= xfer_mode
;
1736 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1737 if (ap
->ops
->set_piomode
)
1738 ap
->ops
->set_piomode(ap
, dev
);
1745 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1746 unsigned int xfer_shift
)
1750 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1751 struct ata_device
*dev
= &ap
->device
[i
];
1752 if (ata_dev_present(dev
)) {
1753 dev
->dma_mode
= xfer_mode
;
1754 dev
->xfer_mode
= xfer_mode
;
1755 dev
->xfer_shift
= xfer_shift
;
1756 if (ap
->ops
->set_dmamode
)
1757 ap
->ops
->set_dmamode(ap
, dev
);
1763 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1764 * @ap: port on which timings will be programmed
1766 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1769 * PCI/etc. bus probe sem.
1772 static void ata_set_mode(struct ata_port
*ap
)
1774 unsigned int xfer_shift
;
1778 /* step 1: always set host PIO timings */
1779 rc
= ata_host_set_pio(ap
);
1783 /* step 2: choose the best data xfer mode */
1784 xfer_mode
= xfer_shift
= 0;
1785 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1789 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1790 if (xfer_shift
!= ATA_SHIFT_PIO
)
1791 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1793 /* step 4: update devices' xfer mode */
1794 ata_dev_set_mode(ap
, &ap
->device
[0]);
1795 ata_dev_set_mode(ap
, &ap
->device
[1]);
1797 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1800 if (ap
->ops
->post_set_mode
)
1801 ap
->ops
->post_set_mode(ap
);
1806 ata_port_disable(ap
);
1810 * ata_busy_sleep - sleep until BSY clears, or timeout
1811 * @ap: port containing status register to be polled
1812 * @tmout_pat: impatience timeout
1813 * @tmout: overall timeout
1815 * Sleep until ATA Status register bit BSY clears,
1816 * or a timeout occurs.
1822 static unsigned int ata_busy_sleep (struct ata_port
*ap
,
1823 unsigned long tmout_pat
,
1824 unsigned long tmout
)
1826 unsigned long timer_start
, timeout
;
1829 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1830 timer_start
= jiffies
;
1831 timeout
= timer_start
+ tmout_pat
;
1832 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1834 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1837 if (status
& ATA_BUSY
)
1838 printk(KERN_WARNING
"ata%u is slow to respond, "
1839 "please be patient\n", ap
->id
);
1841 timeout
= timer_start
+ tmout
;
1842 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1844 status
= ata_chk_status(ap
);
1847 if (status
& ATA_BUSY
) {
1848 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1849 ap
->id
, tmout
/ HZ
);
1856 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1858 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1859 unsigned int dev0
= devmask
& (1 << 0);
1860 unsigned int dev1
= devmask
& (1 << 1);
1861 unsigned long timeout
;
1863 /* if device 0 was found in ata_devchk, wait for its
1867 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1869 /* if device 1 was found in ata_devchk, wait for
1870 * register access, then wait for BSY to clear
1872 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
1876 ap
->ops
->dev_select(ap
, 1);
1877 if (ap
->flags
& ATA_FLAG_MMIO
) {
1878 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
1879 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
1881 nsect
= inb(ioaddr
->nsect_addr
);
1882 lbal
= inb(ioaddr
->lbal_addr
);
1884 if ((nsect
== 1) && (lbal
== 1))
1886 if (time_after(jiffies
, timeout
)) {
1890 msleep(50); /* give drive a breather */
1893 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1895 /* is all this really necessary? */
1896 ap
->ops
->dev_select(ap
, 0);
1898 ap
->ops
->dev_select(ap
, 1);
1900 ap
->ops
->dev_select(ap
, 0);
1904 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1905 * @ap: Port to reset and probe
1907 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1908 * probe the bus. Not often used these days.
1911 * PCI/etc. bus probe sem.
1912 * Obtains host_set lock.
1916 static unsigned int ata_bus_edd(struct ata_port
*ap
)
1918 struct ata_taskfile tf
;
1919 unsigned long flags
;
1921 /* set up execute-device-diag (bus reset) taskfile */
1922 /* also, take interrupts to a known state (disabled) */
1923 DPRINTK("execute-device-diag\n");
1924 ata_tf_init(ap
, &tf
, 0);
1926 tf
.command
= ATA_CMD_EDD
;
1927 tf
.protocol
= ATA_PROT_NODATA
;
1930 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1931 ata_tf_to_host(ap
, &tf
);
1932 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1934 /* spec says at least 2ms. but who knows with those
1935 * crazy ATAPI devices...
1939 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1942 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
1943 unsigned int devmask
)
1945 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1947 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
1949 /* software reset. causes dev0 to be selected */
1950 if (ap
->flags
& ATA_FLAG_MMIO
) {
1951 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1952 udelay(20); /* FIXME: flush */
1953 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
1954 udelay(20); /* FIXME: flush */
1955 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
1957 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1959 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
1961 outb(ap
->ctl
, ioaddr
->ctl_addr
);
1964 /* spec mandates ">= 2ms" before checking status.
1965 * We wait 150ms, because that was the magic delay used for
1966 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1967 * between when the ATA command register is written, and then
1968 * status is checked. Because waiting for "a while" before
1969 * checking status is fine, post SRST, we perform this magic
1970 * delay here as well.
1974 ata_bus_post_reset(ap
, devmask
);
1980 * ata_bus_reset - reset host port and associated ATA channel
1981 * @ap: port to reset
1983 * This is typically the first time we actually start issuing
1984 * commands to the ATA channel. We wait for BSY to clear, then
1985 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1986 * result. Determine what devices, if any, are on the channel
1987 * by looking at the device 0/1 error register. Look at the signature
1988 * stored in each device's taskfile registers, to determine if
1989 * the device is ATA or ATAPI.
1992 * PCI/etc. bus probe sem.
1993 * Obtains host_set lock.
1996 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1999 void ata_bus_reset(struct ata_port
*ap
)
2001 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2002 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2004 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
2006 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2008 /* determine if device 0/1 are present */
2009 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2012 dev0
= ata_devchk(ap
, 0);
2014 dev1
= ata_devchk(ap
, 1);
2018 devmask
|= (1 << 0);
2020 devmask
|= (1 << 1);
2022 /* select device 0 again */
2023 ap
->ops
->dev_select(ap
, 0);
2025 /* issue bus reset */
2026 if (ap
->flags
& ATA_FLAG_SRST
)
2027 rc
= ata_bus_softreset(ap
, devmask
);
2028 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
2029 /* set up device control */
2030 if (ap
->flags
& ATA_FLAG_MMIO
)
2031 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2033 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2034 rc
= ata_bus_edd(ap
);
2041 * determine by signature whether we have ATA or ATAPI devices
2043 err
= ata_dev_try_classify(ap
, 0);
2044 if ((slave_possible
) && (err
!= 0x81))
2045 ata_dev_try_classify(ap
, 1);
2047 /* re-enable interrupts */
2048 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2051 /* is double-select really necessary? */
2052 if (ap
->device
[1].class != ATA_DEV_NONE
)
2053 ap
->ops
->dev_select(ap
, 1);
2054 if (ap
->device
[0].class != ATA_DEV_NONE
)
2055 ap
->ops
->dev_select(ap
, 0);
2057 /* if no devices were detected, disable this port */
2058 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2059 (ap
->device
[1].class == ATA_DEV_NONE
))
2062 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2063 /* set up device control for ATA_FLAG_SATA_RESET */
2064 if (ap
->flags
& ATA_FLAG_MMIO
)
2065 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2067 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2074 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2075 ap
->ops
->port_disable(ap
);
2080 static void ata_pr_blacklisted(const struct ata_port
*ap
,
2081 const struct ata_device
*dev
)
2083 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2084 ap
->id
, dev
->devno
);
2087 static const char * const ata_dma_blacklist
[] = {
2106 "Toshiba CD-ROM XM-6202B",
2107 "TOSHIBA CD-ROM XM-1702BC",
2109 "E-IDE CD-ROM CR-840",
2112 "SAMSUNG CD-ROM SC-148C",
2113 "SAMSUNG CD-ROM SC",
2115 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2119 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2121 unsigned char model_num
[40];
2126 ata_dev_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2129 len
= strnlen(s
, sizeof(model_num
));
2131 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2132 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2137 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2138 if (!strncmp(ata_dma_blacklist
[i
], s
, len
))
2144 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
)
2146 const struct ata_device
*master
, *slave
;
2149 master
= &ap
->device
[0];
2150 slave
= &ap
->device
[1];
2152 assert (ata_dev_present(master
) || ata_dev_present(slave
));
2154 if (shift
== ATA_SHIFT_UDMA
) {
2155 mask
= ap
->udma_mask
;
2156 if (ata_dev_present(master
)) {
2157 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2158 if (ata_dma_blacklisted(master
)) {
2160 ata_pr_blacklisted(ap
, master
);
2163 if (ata_dev_present(slave
)) {
2164 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2165 if (ata_dma_blacklisted(slave
)) {
2167 ata_pr_blacklisted(ap
, slave
);
2171 else if (shift
== ATA_SHIFT_MWDMA
) {
2172 mask
= ap
->mwdma_mask
;
2173 if (ata_dev_present(master
)) {
2174 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2175 if (ata_dma_blacklisted(master
)) {
2177 ata_pr_blacklisted(ap
, master
);
2180 if (ata_dev_present(slave
)) {
2181 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2182 if (ata_dma_blacklisted(slave
)) {
2184 ata_pr_blacklisted(ap
, slave
);
2188 else if (shift
== ATA_SHIFT_PIO
) {
2189 mask
= ap
->pio_mask
;
2190 if (ata_dev_present(master
)) {
2191 /* spec doesn't return explicit support for
2192 * PIO0-2, so we fake it
2194 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2199 if (ata_dev_present(slave
)) {
2200 /* spec doesn't return explicit support for
2201 * PIO0-2, so we fake it
2203 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2210 mask
= 0xffffffff; /* shut up compiler warning */
2217 /* find greatest bit */
2218 static int fgb(u32 bitmap
)
2223 for (i
= 0; i
< 32; i
++)
2224 if (bitmap
& (1 << i
))
2231 * ata_choose_xfer_mode - attempt to find best transfer mode
2232 * @ap: Port for which an xfer mode will be selected
2233 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2234 * @xfer_shift_out: (output) bit shift that selects this mode
2236 * Based on host and device capabilities, determine the
2237 * maximum transfer mode that is amenable to all.
2240 * PCI/etc. bus probe sem.
2243 * Zero on success, negative on error.
2246 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
2248 unsigned int *xfer_shift_out
)
2250 unsigned int mask
, shift
;
2253 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2254 shift
= xfer_mode_classes
[i
].shift
;
2255 mask
= ata_get_mode_mask(ap
, shift
);
2259 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2260 *xfer_shift_out
= shift
;
2269 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2270 * @ap: Port associated with device @dev
2271 * @dev: Device to which command will be sent
2273 * Issue SET FEATURES - XFER MODE command to device @dev
2277 * PCI/etc. bus probe sem.
2280 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2282 DECLARE_COMPLETION(wait
);
2283 struct ata_queued_cmd
*qc
;
2285 unsigned long flags
;
2287 /* set up set-features taskfile */
2288 DPRINTK("set features - xfer mode\n");
2290 qc
= ata_qc_new_init(ap
, dev
);
2293 qc
->tf
.command
= ATA_CMD_SET_FEATURES
;
2294 qc
->tf
.feature
= SETFEATURES_XFER
;
2295 qc
->tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2296 qc
->tf
.protocol
= ATA_PROT_NODATA
;
2297 qc
->tf
.nsect
= dev
->xfer_mode
;
2299 qc
->waiting
= &wait
;
2300 qc
->complete_fn
= ata_qc_complete_noop
;
2302 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2303 rc
= ata_qc_issue(qc
);
2304 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2307 ata_port_disable(ap
);
2309 ata_qc_wait_err(qc
, &wait
);
2315 * ata_dev_reread_id - Reread the device identify device info
2316 * @ap: port where the device is
2317 * @dev: device to reread the identify device info
2322 static void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
)
2324 DECLARE_COMPLETION(wait
);
2325 struct ata_queued_cmd
*qc
;
2326 unsigned long flags
;
2329 qc
= ata_qc_new_init(ap
, dev
);
2332 ata_sg_init_one(qc
, dev
->id
, sizeof(dev
->id
));
2333 qc
->dma_dir
= DMA_FROM_DEVICE
;
2335 if (dev
->class == ATA_DEV_ATA
) {
2336 qc
->tf
.command
= ATA_CMD_ID_ATA
;
2337 DPRINTK("do ATA identify\n");
2339 qc
->tf
.command
= ATA_CMD_ID_ATAPI
;
2340 DPRINTK("do ATAPI identify\n");
2343 qc
->tf
.flags
|= ATA_TFLAG_DEVICE
;
2344 qc
->tf
.protocol
= ATA_PROT_PIO
;
2347 qc
->waiting
= &wait
;
2348 qc
->complete_fn
= ata_qc_complete_noop
;
2350 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2351 rc
= ata_qc_issue(qc
);
2352 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2357 ata_qc_wait_err(qc
, &wait
);
2359 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
2367 ata_port_disable(ap
);
2371 * ata_dev_init_params - Issue INIT DEV PARAMS command
2372 * @ap: Port associated with device @dev
2373 * @dev: Device to which command will be sent
2378 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
)
2380 DECLARE_COMPLETION(wait
);
2381 struct ata_queued_cmd
*qc
;
2383 unsigned long flags
;
2384 u16 sectors
= dev
->id
[6];
2385 u16 heads
= dev
->id
[3];
2387 /* Number of sectors per track 1-255. Number of heads 1-16 */
2388 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2391 /* set up init dev params taskfile */
2392 DPRINTK("init dev params \n");
2394 qc
= ata_qc_new_init(ap
, dev
);
2397 qc
->tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2398 qc
->tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2399 qc
->tf
.protocol
= ATA_PROT_NODATA
;
2400 qc
->tf
.nsect
= sectors
;
2401 qc
->tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2403 qc
->waiting
= &wait
;
2404 qc
->complete_fn
= ata_qc_complete_noop
;
2406 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2407 rc
= ata_qc_issue(qc
);
2408 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2411 ata_port_disable(ap
);
2413 ata_qc_wait_err(qc
, &wait
);
2419 * ata_sg_clean - Unmap DMA memory associated with command
2420 * @qc: Command containing DMA memory to be released
2422 * Unmap all mapped DMA memory associated with this command.
2425 * spin_lock_irqsave(host_set lock)
2428 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2430 struct ata_port
*ap
= qc
->ap
;
2431 struct scatterlist
*sg
= qc
->__sg
;
2432 int dir
= qc
->dma_dir
;
2433 void *pad_buf
= NULL
;
2435 assert(qc
->flags
& ATA_QCFLAG_DMAMAP
);
2438 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2439 assert(qc
->n_elem
== 1);
2441 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2443 /* if we padded the buffer out to 32-bit bound, and data
2444 * xfer direction is from-device, we must copy from the
2445 * pad buffer back into the supplied buffer
2447 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2448 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2450 if (qc
->flags
& ATA_QCFLAG_SG
) {
2452 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2453 /* restore last sg */
2454 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2456 struct scatterlist
*psg
= &qc
->pad_sgent
;
2457 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2458 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2459 kunmap_atomic(psg
->page
, KM_IRQ0
);
2462 if (sg_dma_len(&sg
[0]) > 0)
2463 dma_unmap_single(ap
->host_set
->dev
,
2464 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2467 sg
->length
+= qc
->pad_len
;
2469 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2470 pad_buf
, qc
->pad_len
);
2473 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2478 * ata_fill_sg - Fill PCI IDE PRD table
2479 * @qc: Metadata associated with taskfile to be transferred
2481 * Fill PCI IDE PRD (scatter-gather) table with segments
2482 * associated with the current disk command.
2485 * spin_lock_irqsave(host_set lock)
2488 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2490 struct ata_port
*ap
= qc
->ap
;
2491 struct scatterlist
*sg
;
2494 assert(qc
->__sg
!= NULL
);
2495 assert(qc
->n_elem
> 0);
2498 ata_for_each_sg(sg
, qc
) {
2502 /* determine if physical DMA addr spans 64K boundary.
2503 * Note h/w doesn't support 64-bit, so we unconditionally
2504 * truncate dma_addr_t to u32.
2506 addr
= (u32
) sg_dma_address(sg
);
2507 sg_len
= sg_dma_len(sg
);
2510 offset
= addr
& 0xffff;
2512 if ((offset
+ sg_len
) > 0x10000)
2513 len
= 0x10000 - offset
;
2515 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2516 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2517 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2526 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2529 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2530 * @qc: Metadata associated with taskfile to check
2532 * Allow low-level driver to filter ATA PACKET commands, returning
2533 * a status indicating whether or not it is OK to use DMA for the
2534 * supplied PACKET command.
2537 * spin_lock_irqsave(host_set lock)
2539 * RETURNS: 0 when ATAPI DMA can be used
2542 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2544 struct ata_port
*ap
= qc
->ap
;
2545 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2547 if (ap
->ops
->check_atapi_dma
)
2548 rc
= ap
->ops
->check_atapi_dma(qc
);
2553 * ata_qc_prep - Prepare taskfile for submission
2554 * @qc: Metadata associated with taskfile to be prepared
2556 * Prepare ATA taskfile for submission.
2559 * spin_lock_irqsave(host_set lock)
2561 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2563 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2570 * ata_sg_init_one - Associate command with memory buffer
2571 * @qc: Command to be associated
2572 * @buf: Memory buffer
2573 * @buflen: Length of memory buffer, in bytes.
2575 * Initialize the data-related elements of queued_cmd @qc
2576 * to point to a single memory buffer, @buf of byte length @buflen.
2579 * spin_lock_irqsave(host_set lock)
2582 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2584 struct scatterlist
*sg
;
2586 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2588 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2589 qc
->__sg
= &qc
->sgent
;
2591 qc
->orig_n_elem
= 1;
2595 sg_init_one(sg
, buf
, buflen
);
2599 * ata_sg_init - Associate command with scatter-gather table.
2600 * @qc: Command to be associated
2601 * @sg: Scatter-gather table.
2602 * @n_elem: Number of elements in s/g table.
2604 * Initialize the data-related elements of queued_cmd @qc
2605 * to point to a scatter-gather table @sg, containing @n_elem
2609 * spin_lock_irqsave(host_set lock)
2612 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2613 unsigned int n_elem
)
2615 qc
->flags
|= ATA_QCFLAG_SG
;
2617 qc
->n_elem
= n_elem
;
2618 qc
->orig_n_elem
= n_elem
;
2622 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2623 * @qc: Command with memory buffer to be mapped.
2625 * DMA-map the memory buffer associated with queued_cmd @qc.
2628 * spin_lock_irqsave(host_set lock)
2631 * Zero on success, negative on error.
2634 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2636 struct ata_port
*ap
= qc
->ap
;
2637 int dir
= qc
->dma_dir
;
2638 struct scatterlist
*sg
= qc
->__sg
;
2639 dma_addr_t dma_address
;
2641 /* we must lengthen transfers to end on a 32-bit boundary */
2642 qc
->pad_len
= sg
->length
& 3;
2644 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2645 struct scatterlist
*psg
= &qc
->pad_sgent
;
2647 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
2649 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2651 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2652 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2655 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2656 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2658 sg
->length
-= qc
->pad_len
;
2660 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2661 sg
->length
, qc
->pad_len
);
2665 sg_dma_address(sg
) = 0;
2669 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2671 if (dma_mapping_error(dma_address
)) {
2673 sg
->length
+= qc
->pad_len
;
2677 sg_dma_address(sg
) = dma_address
;
2679 sg_dma_len(sg
) = sg
->length
;
2681 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2682 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2688 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2689 * @qc: Command with scatter-gather table to be mapped.
2691 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2694 * spin_lock_irqsave(host_set lock)
2697 * Zero on success, negative on error.
2701 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
2703 struct ata_port
*ap
= qc
->ap
;
2704 struct scatterlist
*sg
= qc
->__sg
;
2705 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
2706 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
2708 VPRINTK("ENTER, ata%u\n", ap
->id
);
2709 assert(qc
->flags
& ATA_QCFLAG_SG
);
2711 /* we must lengthen transfers to end on a 32-bit boundary */
2712 qc
->pad_len
= lsg
->length
& 3;
2714 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2715 struct scatterlist
*psg
= &qc
->pad_sgent
;
2716 unsigned int offset
;
2718 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
2720 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2723 * psg->page/offset are used to copy to-be-written
2724 * data in this function or read data in ata_sg_clean.
2726 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
2727 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
2728 psg
->offset
= offset_in_page(offset
);
2730 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
2731 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2732 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
2733 kunmap_atomic(psg
->page
, KM_IRQ0
);
2736 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2737 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2739 lsg
->length
-= qc
->pad_len
;
2740 if (lsg
->length
== 0)
2743 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2744 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
2747 pre_n_elem
= qc
->n_elem
;
2748 if (trim_sg
&& pre_n_elem
)
2757 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
2759 /* restore last sg */
2760 lsg
->length
+= qc
->pad_len
;
2764 DPRINTK("%d sg elements mapped\n", n_elem
);
2767 qc
->n_elem
= n_elem
;
2773 * ata_poll_qc_complete - turn irq back on and finish qc
2774 * @qc: Command to complete
2775 * @err_mask: ATA status register content
2778 * None. (grabs host lock)
2781 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
2783 struct ata_port
*ap
= qc
->ap
;
2784 unsigned long flags
;
2786 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2787 ap
->flags
&= ~ATA_FLAG_NOINTR
;
2789 ata_qc_complete(qc
);
2790 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2795 * @ap: the target ata_port
2798 * None. (executing in kernel thread context)
2801 * timeout value to use
2804 static unsigned long ata_pio_poll(struct ata_port
*ap
)
2806 struct ata_queued_cmd
*qc
;
2808 unsigned int poll_state
= HSM_ST_UNKNOWN
;
2809 unsigned int reg_state
= HSM_ST_UNKNOWN
;
2811 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2814 switch (ap
->hsm_task_state
) {
2817 poll_state
= HSM_ST_POLL
;
2821 case HSM_ST_LAST_POLL
:
2822 poll_state
= HSM_ST_LAST_POLL
;
2823 reg_state
= HSM_ST_LAST
;
2830 status
= ata_chk_status(ap
);
2831 if (status
& ATA_BUSY
) {
2832 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
2833 ap
->hsm_task_state
= HSM_ST_TMOUT
;
2836 ap
->hsm_task_state
= poll_state
;
2837 return ATA_SHORT_PAUSE
;
2840 ap
->hsm_task_state
= reg_state
;
2845 * ata_pio_complete - check if drive is busy or idle
2846 * @ap: the target ata_port
2849 * None. (executing in kernel thread context)
2852 * Non-zero if qc completed, zero otherwise.
2855 static int ata_pio_complete (struct ata_port
*ap
)
2857 struct ata_queued_cmd
*qc
;
2861 * This is purely heuristic. This is a fast path. Sometimes when
2862 * we enter, BSY will be cleared in a chk-status or two. If not,
2863 * the drive is probably seeking or something. Snooze for a couple
2864 * msecs, then chk-status again. If still busy, fall back to
2865 * HSM_ST_POLL state.
2867 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
| ATA_DRQ
, 10);
2868 if (drv_stat
& (ATA_BUSY
| ATA_DRQ
)) {
2870 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
| ATA_DRQ
, 10);
2871 if (drv_stat
& (ATA_BUSY
| ATA_DRQ
)) {
2872 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
2873 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
2878 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2881 drv_stat
= ata_wait_idle(ap
);
2882 if (!ata_ok(drv_stat
)) {
2883 ap
->hsm_task_state
= HSM_ST_ERR
;
2887 ap
->hsm_task_state
= HSM_ST_IDLE
;
2889 assert(qc
->err_mask
== 0);
2890 ata_poll_qc_complete(qc
);
2892 /* another command may start at this point */
2899 * swap_buf_le16 - swap halves of 16-words in place
2900 * @buf: Buffer to swap
2901 * @buf_words: Number of 16-bit words in buffer.
2903 * Swap halves of 16-bit words if needed to convert from
2904 * little-endian byte order to native cpu byte order, or
2908 * Inherited from caller.
2910 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
2915 for (i
= 0; i
< buf_words
; i
++)
2916 buf
[i
] = le16_to_cpu(buf
[i
]);
2917 #endif /* __BIG_ENDIAN */
2921 * ata_mmio_data_xfer - Transfer data by MMIO
2922 * @ap: port to read/write
2924 * @buflen: buffer length
2925 * @write_data: read/write
2927 * Transfer data from/to the device data register by MMIO.
2930 * Inherited from caller.
2933 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
2934 unsigned int buflen
, int write_data
)
2937 unsigned int words
= buflen
>> 1;
2938 u16
*buf16
= (u16
*) buf
;
2939 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
2941 /* Transfer multiple of 2 bytes */
2943 for (i
= 0; i
< words
; i
++)
2944 writew(le16_to_cpu(buf16
[i
]), mmio
);
2946 for (i
= 0; i
< words
; i
++)
2947 buf16
[i
] = cpu_to_le16(readw(mmio
));
2950 /* Transfer trailing 1 byte, if any. */
2951 if (unlikely(buflen
& 0x01)) {
2952 u16 align_buf
[1] = { 0 };
2953 unsigned char *trailing_buf
= buf
+ buflen
- 1;
2956 memcpy(align_buf
, trailing_buf
, 1);
2957 writew(le16_to_cpu(align_buf
[0]), mmio
);
2959 align_buf
[0] = cpu_to_le16(readw(mmio
));
2960 memcpy(trailing_buf
, align_buf
, 1);
2966 * ata_pio_data_xfer - Transfer data by PIO
2967 * @ap: port to read/write
2969 * @buflen: buffer length
2970 * @write_data: read/write
2972 * Transfer data from/to the device data register by PIO.
2975 * Inherited from caller.
2978 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
2979 unsigned int buflen
, int write_data
)
2981 unsigned int words
= buflen
>> 1;
2983 /* Transfer multiple of 2 bytes */
2985 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
2987 insw(ap
->ioaddr
.data_addr
, buf
, words
);
2989 /* Transfer trailing 1 byte, if any. */
2990 if (unlikely(buflen
& 0x01)) {
2991 u16 align_buf
[1] = { 0 };
2992 unsigned char *trailing_buf
= buf
+ buflen
- 1;
2995 memcpy(align_buf
, trailing_buf
, 1);
2996 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
2998 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
2999 memcpy(trailing_buf
, align_buf
, 1);
3005 * ata_data_xfer - Transfer data from/to the data register.
3006 * @ap: port to read/write
3008 * @buflen: buffer length
3009 * @do_write: read/write
3011 * Transfer data from/to the device data register.
3014 * Inherited from caller.
3017 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3018 unsigned int buflen
, int do_write
)
3020 if (ap
->flags
& ATA_FLAG_MMIO
)
3021 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3023 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3027 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3028 * @qc: Command on going
3030 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3033 * Inherited from caller.
3036 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3038 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3039 struct scatterlist
*sg
= qc
->__sg
;
3040 struct ata_port
*ap
= qc
->ap
;
3042 unsigned int offset
;
3045 if (qc
->cursect
== (qc
->nsect
- 1))
3046 ap
->hsm_task_state
= HSM_ST_LAST
;
3048 page
= sg
[qc
->cursg
].page
;
3049 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3051 /* get the current page and offset */
3052 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3053 offset
%= PAGE_SIZE
;
3055 buf
= kmap(page
) + offset
;
3060 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3065 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3067 /* do the actual data transfer */
3068 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3069 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3075 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3076 * @qc: Command on going
3077 * @bytes: number of bytes
3079 * Transfer Transfer data from/to the ATAPI device.
3082 * Inherited from caller.
3086 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3088 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3089 struct scatterlist
*sg
= qc
->__sg
;
3090 struct ata_port
*ap
= qc
->ap
;
3093 unsigned int offset
, count
;
3095 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3096 ap
->hsm_task_state
= HSM_ST_LAST
;
3099 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3101 * The end of qc->sg is reached and the device expects
3102 * more data to transfer. In order not to overrun qc->sg
3103 * and fulfill length specified in the byte count register,
3104 * - for read case, discard trailing data from the device
3105 * - for write case, padding zero data to the device
3107 u16 pad_buf
[1] = { 0 };
3108 unsigned int words
= bytes
>> 1;
3111 if (words
) /* warning if bytes > 1 */
3112 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3115 for (i
= 0; i
< words
; i
++)
3116 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3118 ap
->hsm_task_state
= HSM_ST_LAST
;
3122 sg
= &qc
->__sg
[qc
->cursg
];
3125 offset
= sg
->offset
+ qc
->cursg_ofs
;
3127 /* get the current page and offset */
3128 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3129 offset
%= PAGE_SIZE
;
3131 /* don't overrun current sg */
3132 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3134 /* don't cross page boundaries */
3135 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3137 buf
= kmap(page
) + offset
;
3140 qc
->curbytes
+= count
;
3141 qc
->cursg_ofs
+= count
;
3143 if (qc
->cursg_ofs
== sg
->length
) {
3148 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3150 /* do the actual data transfer */
3151 ata_data_xfer(ap
, buf
, count
, do_write
);
3160 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3161 * @qc: Command on going
3163 * Transfer Transfer data from/to the ATAPI device.
3166 * Inherited from caller.
3169 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3171 struct ata_port
*ap
= qc
->ap
;
3172 struct ata_device
*dev
= qc
->dev
;
3173 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3174 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3176 ap
->ops
->tf_read(ap
, &qc
->tf
);
3177 ireason
= qc
->tf
.nsect
;
3178 bc_lo
= qc
->tf
.lbam
;
3179 bc_hi
= qc
->tf
.lbah
;
3180 bytes
= (bc_hi
<< 8) | bc_lo
;
3182 /* shall be cleared to zero, indicating xfer of data */
3183 if (ireason
& (1 << 0))
3186 /* make sure transfer direction matches expected */
3187 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3188 if (do_write
!= i_write
)
3191 __atapi_pio_bytes(qc
, bytes
);
3196 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3197 ap
->id
, dev
->devno
);
3198 ap
->hsm_task_state
= HSM_ST_ERR
;
3202 * ata_pio_block - start PIO on a block
3203 * @ap: the target ata_port
3206 * None. (executing in kernel thread context)
3209 static void ata_pio_block(struct ata_port
*ap
)
3211 struct ata_queued_cmd
*qc
;
3215 * This is purely heuristic. This is a fast path.
3216 * Sometimes when we enter, BSY will be cleared in
3217 * a chk-status or two. If not, the drive is probably seeking
3218 * or something. Snooze for a couple msecs, then
3219 * chk-status again. If still busy, fall back to
3220 * HSM_ST_POLL state.
3222 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3223 if (status
& ATA_BUSY
) {
3225 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3226 if (status
& ATA_BUSY
) {
3227 ap
->hsm_task_state
= HSM_ST_POLL
;
3228 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3233 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3236 if (is_atapi_taskfile(&qc
->tf
)) {
3237 /* no more data to transfer or unsupported ATAPI command */
3238 if ((status
& ATA_DRQ
) == 0) {
3239 ap
->hsm_task_state
= HSM_ST_LAST
;
3243 atapi_pio_bytes(qc
);
3245 /* handle BSY=0, DRQ=0 as error */
3246 if ((status
& ATA_DRQ
) == 0) {
3247 ap
->hsm_task_state
= HSM_ST_ERR
;
3255 static void ata_pio_error(struct ata_port
*ap
)
3257 struct ata_queued_cmd
*qc
;
3259 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3261 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3264 ap
->hsm_task_state
= HSM_ST_IDLE
;
3266 qc
->err_mask
|= AC_ERR_ATA_BUS
;
3267 ata_poll_qc_complete(qc
);
3270 static void ata_pio_task(void *_data
)
3272 struct ata_port
*ap
= _data
;
3273 unsigned long timeout
;
3280 switch (ap
->hsm_task_state
) {
3289 qc_completed
= ata_pio_complete(ap
);
3293 case HSM_ST_LAST_POLL
:
3294 timeout
= ata_pio_poll(ap
);
3304 queue_delayed_work(ata_wq
, &ap
->pio_task
, timeout
);
3305 else if (!qc_completed
)
3310 * ata_qc_timeout - Handle timeout of queued command
3311 * @qc: Command that timed out
3313 * Some part of the kernel (currently, only the SCSI layer)
3314 * has noticed that the active command on port @ap has not
3315 * completed after a specified length of time. Handle this
3316 * condition by disabling DMA (if necessary) and completing
3317 * transactions, with error if necessary.
3319 * This also handles the case of the "lost interrupt", where
3320 * for some reason (possibly hardware bug, possibly driver bug)
3321 * an interrupt was not delivered to the driver, even though the
3322 * transaction completed successfully.
3325 * Inherited from SCSI layer (none, can sleep)
3328 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3330 struct ata_port
*ap
= qc
->ap
;
3331 struct ata_host_set
*host_set
= ap
->host_set
;
3332 u8 host_stat
= 0, drv_stat
;
3333 unsigned long flags
;
3337 spin_lock_irqsave(&host_set
->lock
, flags
);
3339 /* hack alert! We cannot use the supplied completion
3340 * function from inside the ->eh_strategy_handler() thread.
3341 * libata is the only user of ->eh_strategy_handler() in
3342 * any kernel, so the default scsi_done() assumes it is
3343 * not being called from the SCSI EH.
3345 qc
->scsidone
= scsi_finish_command
;
3347 switch (qc
->tf
.protocol
) {
3350 case ATA_PROT_ATAPI_DMA
:
3351 host_stat
= ap
->ops
->bmdma_status(ap
);
3353 /* before we do anything else, clear DMA-Start bit */
3354 ap
->ops
->bmdma_stop(qc
);
3360 drv_stat
= ata_chk_status(ap
);
3362 /* ack bmdma irq events */
3363 ap
->ops
->irq_clear(ap
);
3365 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3366 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3368 /* complete taskfile transaction */
3369 qc
->err_mask
|= ac_err_mask(drv_stat
);
3370 ata_qc_complete(qc
);
3374 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3380 * ata_eng_timeout - Handle timeout of queued command
3381 * @ap: Port on which timed-out command is active
3383 * Some part of the kernel (currently, only the SCSI layer)
3384 * has noticed that the active command on port @ap has not
3385 * completed after a specified length of time. Handle this
3386 * condition by disabling DMA (if necessary) and completing
3387 * transactions, with error if necessary.
3389 * This also handles the case of the "lost interrupt", where
3390 * for some reason (possibly hardware bug, possibly driver bug)
3391 * an interrupt was not delivered to the driver, even though the
3392 * transaction completed successfully.
3395 * Inherited from SCSI layer (none, can sleep)
3398 void ata_eng_timeout(struct ata_port
*ap
)
3400 struct ata_queued_cmd
*qc
;
3404 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3408 printk(KERN_ERR
"ata%u: BUG: timeout without command\n",
3418 * ata_qc_new - Request an available ATA command, for queueing
3419 * @ap: Port associated with device @dev
3420 * @dev: Device from whom we request an available command structure
3426 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3428 struct ata_queued_cmd
*qc
= NULL
;
3431 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3432 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3433 qc
= ata_qc_from_tag(ap
, i
);
3444 * ata_qc_new_init - Request an available ATA command, and initialize it
3445 * @ap: Port associated with device @dev
3446 * @dev: Device from whom we request an available command structure
3452 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3453 struct ata_device
*dev
)
3455 struct ata_queued_cmd
*qc
;
3457 qc
= ata_qc_new(ap
);
3469 int ata_qc_complete_noop(struct ata_queued_cmd
*qc
)
3474 static void __ata_qc_complete(struct ata_queued_cmd
*qc
)
3476 struct ata_port
*ap
= qc
->ap
;
3477 unsigned int tag
, do_clear
= 0;
3481 if (likely(ata_tag_valid(tag
))) {
3482 if (tag
== ap
->active_tag
)
3483 ap
->active_tag
= ATA_TAG_POISON
;
3484 qc
->tag
= ATA_TAG_POISON
;
3489 struct completion
*waiting
= qc
->waiting
;
3494 if (likely(do_clear
))
3495 clear_bit(tag
, &ap
->qactive
);
3499 * ata_qc_free - free unused ata_queued_cmd
3500 * @qc: Command to complete
3502 * Designed to free unused ata_queued_cmd object
3503 * in case something prevents using it.
3506 * spin_lock_irqsave(host_set lock)
3508 void ata_qc_free(struct ata_queued_cmd
*qc
)
3510 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3511 assert(qc
->waiting
== NULL
); /* nothing should be waiting */
3513 __ata_qc_complete(qc
);
3517 * ata_qc_complete - Complete an active ATA command
3518 * @qc: Command to complete
3519 * @err_mask: ATA Status register contents
3521 * Indicate to the mid and upper layers that an ATA
3522 * command has completed, with either an ok or not-ok status.
3525 * spin_lock_irqsave(host_set lock)
3528 void ata_qc_complete(struct ata_queued_cmd
*qc
)
3532 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3533 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
3535 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3538 /* atapi: mark qc as inactive to prevent the interrupt handler
3539 * from completing the command twice later, before the error handler
3540 * is called. (when rc != 0 and atapi request sense is needed)
3542 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3544 /* call completion callback */
3545 rc
= qc
->complete_fn(qc
);
3547 /* if callback indicates not to complete command (non-zero),
3548 * return immediately
3553 __ata_qc_complete(qc
);
3558 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3560 struct ata_port
*ap
= qc
->ap
;
3562 switch (qc
->tf
.protocol
) {
3564 case ATA_PROT_ATAPI_DMA
:
3567 case ATA_PROT_ATAPI
:
3569 case ATA_PROT_PIO_MULT
:
3570 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3583 * ata_qc_issue - issue taskfile to device
3584 * @qc: command to issue to device
3586 * Prepare an ATA command to submission to device.
3587 * This includes mapping the data into a DMA-able
3588 * area, filling in the S/G table, and finally
3589 * writing the taskfile to hardware, starting the command.
3592 * spin_lock_irqsave(host_set lock)
3595 * Zero on success, negative on error.
3598 int ata_qc_issue(struct ata_queued_cmd
*qc
)
3600 struct ata_port
*ap
= qc
->ap
;
3602 if (ata_should_dma_map(qc
)) {
3603 if (qc
->flags
& ATA_QCFLAG_SG
) {
3604 if (ata_sg_setup(qc
))
3606 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3607 if (ata_sg_setup_one(qc
))
3611 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3614 ap
->ops
->qc_prep(qc
);
3616 qc
->ap
->active_tag
= qc
->tag
;
3617 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3619 return ap
->ops
->qc_issue(qc
);
3627 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3628 * @qc: command to issue to device
3630 * Using various libata functions and hooks, this function
3631 * starts an ATA command. ATA commands are grouped into
3632 * classes called "protocols", and issuing each type of protocol
3633 * is slightly different.
3635 * May be used as the qc_issue() entry in ata_port_operations.
3638 * spin_lock_irqsave(host_set lock)
3641 * Zero on success, negative on error.
3644 int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3646 struct ata_port
*ap
= qc
->ap
;
3648 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3650 switch (qc
->tf
.protocol
) {
3651 case ATA_PROT_NODATA
:
3652 ata_tf_to_host(ap
, &qc
->tf
);
3656 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3657 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3658 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3661 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
3662 ata_qc_set_polling(qc
);
3663 ata_tf_to_host(ap
, &qc
->tf
);
3664 ap
->hsm_task_state
= HSM_ST
;
3665 queue_work(ata_wq
, &ap
->pio_task
);
3668 case ATA_PROT_ATAPI
:
3669 ata_qc_set_polling(qc
);
3670 ata_tf_to_host(ap
, &qc
->tf
);
3671 queue_work(ata_wq
, &ap
->packet_task
);
3674 case ATA_PROT_ATAPI_NODATA
:
3675 ap
->flags
|= ATA_FLAG_NOINTR
;
3676 ata_tf_to_host(ap
, &qc
->tf
);
3677 queue_work(ata_wq
, &ap
->packet_task
);
3680 case ATA_PROT_ATAPI_DMA
:
3681 ap
->flags
|= ATA_FLAG_NOINTR
;
3682 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3683 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3684 queue_work(ata_wq
, &ap
->packet_task
);
3696 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3697 * @qc: Info associated with this ATA transaction.
3700 * spin_lock_irqsave(host_set lock)
3703 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
3705 struct ata_port
*ap
= qc
->ap
;
3706 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3708 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3710 /* load PRD table addr. */
3711 mb(); /* make sure PRD table writes are visible to controller */
3712 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
3714 /* specify data direction, triple-check start bit is clear */
3715 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3716 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3718 dmactl
|= ATA_DMA_WR
;
3719 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
3721 /* issue r/w command */
3722 ap
->ops
->exec_command(ap
, &qc
->tf
);
3726 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
3727 * @qc: Info associated with this ATA transaction.
3730 * spin_lock_irqsave(host_set lock)
3733 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
3735 struct ata_port
*ap
= qc
->ap
;
3736 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3739 /* start host DMA transaction */
3740 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3741 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
3743 /* Strictly, one may wish to issue a readb() here, to
3744 * flush the mmio write. However, control also passes
3745 * to the hardware at this point, and it will interrupt
3746 * us when we are to resume control. So, in effect,
3747 * we don't care when the mmio write flushes.
3748 * Further, a read of the DMA status register _immediately_
3749 * following the write may not be what certain flaky hardware
3750 * is expected, so I think it is best to not add a readb()
3751 * without first all the MMIO ATA cards/mobos.
3752 * Or maybe I'm just being paranoid.
3757 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3758 * @qc: Info associated with this ATA transaction.
3761 * spin_lock_irqsave(host_set lock)
3764 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
3766 struct ata_port
*ap
= qc
->ap
;
3767 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3770 /* load PRD table addr. */
3771 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
3773 /* specify data direction, triple-check start bit is clear */
3774 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3775 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3777 dmactl
|= ATA_DMA_WR
;
3778 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3780 /* issue r/w command */
3781 ap
->ops
->exec_command(ap
, &qc
->tf
);
3785 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3786 * @qc: Info associated with this ATA transaction.
3789 * spin_lock_irqsave(host_set lock)
3792 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
3794 struct ata_port
*ap
= qc
->ap
;
3797 /* start host DMA transaction */
3798 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3799 outb(dmactl
| ATA_DMA_START
,
3800 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3805 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3806 * @qc: Info associated with this ATA transaction.
3808 * Writes the ATA_DMA_START flag to the DMA command register.
3810 * May be used as the bmdma_start() entry in ata_port_operations.
3813 * spin_lock_irqsave(host_set lock)
3815 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
3817 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3818 ata_bmdma_start_mmio(qc
);
3820 ata_bmdma_start_pio(qc
);
3825 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3826 * @qc: Info associated with this ATA transaction.
3828 * Writes address of PRD table to device's PRD Table Address
3829 * register, sets the DMA control register, and calls
3830 * ops->exec_command() to start the transfer.
3832 * May be used as the bmdma_setup() entry in ata_port_operations.
3835 * spin_lock_irqsave(host_set lock)
3837 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
3839 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3840 ata_bmdma_setup_mmio(qc
);
3842 ata_bmdma_setup_pio(qc
);
3847 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
3848 * @ap: Port associated with this ATA transaction.
3850 * Clear interrupt and error flags in DMA status register.
3852 * May be used as the irq_clear() entry in ata_port_operations.
3855 * spin_lock_irqsave(host_set lock)
3858 void ata_bmdma_irq_clear(struct ata_port
*ap
)
3860 if (ap
->flags
& ATA_FLAG_MMIO
) {
3861 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
3862 writeb(readb(mmio
), mmio
);
3864 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
3865 outb(inb(addr
), addr
);
3872 * ata_bmdma_status - Read PCI IDE BMDMA status
3873 * @ap: Port associated with this ATA transaction.
3875 * Read and return BMDMA status register.
3877 * May be used as the bmdma_status() entry in ata_port_operations.
3880 * spin_lock_irqsave(host_set lock)
3883 u8
ata_bmdma_status(struct ata_port
*ap
)
3886 if (ap
->flags
& ATA_FLAG_MMIO
) {
3887 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3888 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
3890 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
3896 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
3897 * @qc: Command we are ending DMA for
3899 * Clears the ATA_DMA_START flag in the dma control register
3901 * May be used as the bmdma_stop() entry in ata_port_operations.
3904 * spin_lock_irqsave(host_set lock)
3907 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
3909 struct ata_port
*ap
= qc
->ap
;
3910 if (ap
->flags
& ATA_FLAG_MMIO
) {
3911 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3913 /* clear start/stop bit */
3914 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
3915 mmio
+ ATA_DMA_CMD
);
3917 /* clear start/stop bit */
3918 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
3919 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3922 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
3923 ata_altstatus(ap
); /* dummy read */
3927 * ata_host_intr - Handle host interrupt for given (port, task)
3928 * @ap: Port on which interrupt arrived (possibly...)
3929 * @qc: Taskfile currently active in engine
3931 * Handle host interrupt for given queued command. Currently,
3932 * only DMA interrupts are handled. All other commands are
3933 * handled via polling with interrupts disabled (nIEN bit).
3936 * spin_lock_irqsave(host_set lock)
3939 * One if interrupt was handled, zero if not (shared irq).
3942 inline unsigned int ata_host_intr (struct ata_port
*ap
,
3943 struct ata_queued_cmd
*qc
)
3945 u8 status
, host_stat
;
3947 switch (qc
->tf
.protocol
) {
3950 case ATA_PROT_ATAPI_DMA
:
3951 case ATA_PROT_ATAPI
:
3952 /* check status of DMA engine */
3953 host_stat
= ap
->ops
->bmdma_status(ap
);
3954 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
3956 /* if it's not our irq... */
3957 if (!(host_stat
& ATA_DMA_INTR
))
3960 /* before we do anything else, clear DMA-Start bit */
3961 ap
->ops
->bmdma_stop(qc
);
3965 case ATA_PROT_ATAPI_NODATA
:
3966 case ATA_PROT_NODATA
:
3967 /* check altstatus */
3968 status
= ata_altstatus(ap
);
3969 if (status
& ATA_BUSY
)
3972 /* check main status, clearing INTRQ */
3973 status
= ata_chk_status(ap
);
3974 if (unlikely(status
& ATA_BUSY
))
3976 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
3977 ap
->id
, qc
->tf
.protocol
, status
);
3979 /* ack bmdma irq events */
3980 ap
->ops
->irq_clear(ap
);
3982 /* complete taskfile transaction */
3983 qc
->err_mask
|= ac_err_mask(status
);
3984 ata_qc_complete(qc
);
3991 return 1; /* irq handled */
3994 ap
->stats
.idle_irq
++;
3997 if ((ap
->stats
.idle_irq
% 1000) == 0) {
3999 ata_irq_ack(ap
, 0); /* debug trap */
4000 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4003 return 0; /* irq not handled */
4007 * ata_interrupt - Default ATA host interrupt handler
4008 * @irq: irq line (unused)
4009 * @dev_instance: pointer to our ata_host_set information structure
4012 * Default interrupt handler for PCI IDE devices. Calls
4013 * ata_host_intr() for each port that is not disabled.
4016 * Obtains host_set lock during operation.
4019 * IRQ_NONE or IRQ_HANDLED.
4022 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4024 struct ata_host_set
*host_set
= dev_instance
;
4026 unsigned int handled
= 0;
4027 unsigned long flags
;
4029 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4030 spin_lock_irqsave(&host_set
->lock
, flags
);
4032 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4033 struct ata_port
*ap
;
4035 ap
= host_set
->ports
[i
];
4037 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4038 struct ata_queued_cmd
*qc
;
4040 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4041 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4042 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4043 handled
|= ata_host_intr(ap
, qc
);
4047 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4049 return IRQ_RETVAL(handled
);
4053 * atapi_packet_task - Write CDB bytes to hardware
4054 * @_data: Port to which ATAPI device is attached.
4056 * When device has indicated its readiness to accept
4057 * a CDB, this function is called. Send the CDB.
4058 * If DMA is to be performed, exit immediately.
4059 * Otherwise, we are in polling mode, so poll
4060 * status under operation succeeds or fails.
4063 * Kernel thread context (may sleep)
4066 static void atapi_packet_task(void *_data
)
4068 struct ata_port
*ap
= _data
;
4069 struct ata_queued_cmd
*qc
;
4072 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4074 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
4076 /* sleep-wait for BSY to clear */
4077 DPRINTK("busy wait\n");
4078 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
))
4079 goto err_out_status
;
4081 /* make sure DRQ is set */
4082 status
= ata_chk_status(ap
);
4083 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
)
4087 DPRINTK("send cdb\n");
4088 assert(ap
->cdb_len
>= 12);
4090 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
4091 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4092 unsigned long flags
;
4094 /* Once we're done issuing command and kicking bmdma,
4095 * irq handler takes over. To not lose irq, we need
4096 * to clear NOINTR flag before sending cdb, but
4097 * interrupt handler shouldn't be invoked before we're
4098 * finished. Hence, the following locking.
4100 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4101 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4102 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
4103 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4104 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4105 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4107 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
4109 /* PIO commands are handled by polling */
4110 ap
->hsm_task_state
= HSM_ST
;
4111 queue_work(ata_wq
, &ap
->pio_task
);
4117 status
= ata_chk_status(ap
);
4119 qc
->err_mask
|= __ac_err_mask(status
);
4120 ata_poll_qc_complete(qc
);
4125 * ata_port_start - Set port up for dma.
4126 * @ap: Port to initialize
4128 * Called just after data structures for each port are
4129 * initialized. Allocates space for PRD table.
4131 * May be used as the port_start() entry in ata_port_operations.
4134 * Inherited from caller.
4137 int ata_port_start (struct ata_port
*ap
)
4139 struct device
*dev
= ap
->host_set
->dev
;
4142 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4146 rc
= ata_pad_alloc(ap
, dev
);
4148 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4152 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4159 * ata_port_stop - Undo ata_port_start()
4160 * @ap: Port to shut down
4162 * Frees the PRD table.
4164 * May be used as the port_stop() entry in ata_port_operations.
4167 * Inherited from caller.
4170 void ata_port_stop (struct ata_port
*ap
)
4172 struct device
*dev
= ap
->host_set
->dev
;
4174 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4175 ata_pad_free(ap
, dev
);
4178 void ata_host_stop (struct ata_host_set
*host_set
)
4180 if (host_set
->mmio_base
)
4181 iounmap(host_set
->mmio_base
);
4186 * ata_host_remove - Unregister SCSI host structure with upper layers
4187 * @ap: Port to unregister
4188 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4191 * Inherited from caller.
4194 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4196 struct Scsi_Host
*sh
= ap
->host
;
4201 scsi_remove_host(sh
);
4203 ap
->ops
->port_stop(ap
);
4207 * ata_host_init - Initialize an ata_port structure
4208 * @ap: Structure to initialize
4209 * @host: associated SCSI mid-layer structure
4210 * @host_set: Collection of hosts to which @ap belongs
4211 * @ent: Probe information provided by low-level driver
4212 * @port_no: Port number associated with this ata_port
4214 * Initialize a new ata_port structure, and its associated
4218 * Inherited from caller.
4221 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4222 struct ata_host_set
*host_set
,
4223 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4229 host
->max_channel
= 1;
4230 host
->unique_id
= ata_unique_id
++;
4231 host
->max_cmd_len
= 12;
4233 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4234 ap
->id
= host
->unique_id
;
4236 ap
->ctl
= ATA_DEVCTL_OBS
;
4237 ap
->host_set
= host_set
;
4238 ap
->port_no
= port_no
;
4240 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4241 ap
->pio_mask
= ent
->pio_mask
;
4242 ap
->mwdma_mask
= ent
->mwdma_mask
;
4243 ap
->udma_mask
= ent
->udma_mask
;
4244 ap
->flags
|= ent
->host_flags
;
4245 ap
->ops
= ent
->port_ops
;
4246 ap
->cbl
= ATA_CBL_NONE
;
4247 ap
->active_tag
= ATA_TAG_POISON
;
4248 ap
->last_ctl
= 0xFF;
4250 INIT_WORK(&ap
->packet_task
, atapi_packet_task
, ap
);
4251 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
4253 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4254 ap
->device
[i
].devno
= i
;
4257 ap
->stats
.unhandled_irq
= 1;
4258 ap
->stats
.idle_irq
= 1;
4261 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4265 * ata_host_add - Attach low-level ATA driver to system
4266 * @ent: Information provided by low-level driver
4267 * @host_set: Collections of ports to which we add
4268 * @port_no: Port number associated with this host
4270 * Attach low-level ATA driver to system.
4273 * PCI/etc. bus probe sem.
4276 * New ata_port on success, for NULL on error.
4279 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4280 struct ata_host_set
*host_set
,
4281 unsigned int port_no
)
4283 struct Scsi_Host
*host
;
4284 struct ata_port
*ap
;
4288 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4292 ap
= (struct ata_port
*) &host
->hostdata
[0];
4294 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4296 rc
= ap
->ops
->port_start(ap
);
4303 scsi_host_put(host
);
4308 * ata_device_add - Register hardware device with ATA and SCSI layers
4309 * @ent: Probe information describing hardware device to be registered
4311 * This function processes the information provided in the probe
4312 * information struct @ent, allocates the necessary ATA and SCSI
4313 * host information structures, initializes them, and registers
4314 * everything with requisite kernel subsystems.
4316 * This function requests irqs, probes the ATA bus, and probes
4320 * PCI/etc. bus probe sem.
4323 * Number of ports registered. Zero on error (no ports registered).
4326 int ata_device_add(const struct ata_probe_ent
*ent
)
4328 unsigned int count
= 0, i
;
4329 struct device
*dev
= ent
->dev
;
4330 struct ata_host_set
*host_set
;
4333 /* alloc a container for our list of ATA ports (buses) */
4334 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4335 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4338 spin_lock_init(&host_set
->lock
);
4340 host_set
->dev
= dev
;
4341 host_set
->n_ports
= ent
->n_ports
;
4342 host_set
->irq
= ent
->irq
;
4343 host_set
->mmio_base
= ent
->mmio_base
;
4344 host_set
->private_data
= ent
->private_data
;
4345 host_set
->ops
= ent
->port_ops
;
4347 /* register each port bound to this device */
4348 for (i
= 0; i
< ent
->n_ports
; i
++) {
4349 struct ata_port
*ap
;
4350 unsigned long xfer_mode_mask
;
4352 ap
= ata_host_add(ent
, host_set
, i
);
4356 host_set
->ports
[i
] = ap
;
4357 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4358 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4359 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4361 /* print per-port info to dmesg */
4362 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4363 "bmdma 0x%lX irq %lu\n",
4365 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4366 ata_mode_string(xfer_mode_mask
),
4367 ap
->ioaddr
.cmd_addr
,
4368 ap
->ioaddr
.ctl_addr
,
4369 ap
->ioaddr
.bmdma_addr
,
4373 host_set
->ops
->irq_clear(ap
);
4380 /* obtain irq, that is shared between channels */
4381 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4382 DRV_NAME
, host_set
))
4385 /* perform each probe synchronously */
4386 DPRINTK("probe begin\n");
4387 for (i
= 0; i
< count
; i
++) {
4388 struct ata_port
*ap
;
4391 ap
= host_set
->ports
[i
];
4393 DPRINTK("ata%u: probe begin\n", ap
->id
);
4394 rc
= ata_bus_probe(ap
);
4395 DPRINTK("ata%u: probe end\n", ap
->id
);
4398 /* FIXME: do something useful here?
4399 * Current libata behavior will
4400 * tear down everything when
4401 * the module is removed
4402 * or the h/w is unplugged.
4406 rc
= scsi_add_host(ap
->host
, dev
);
4408 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4410 /* FIXME: do something useful here */
4411 /* FIXME: handle unconditional calls to
4412 * scsi_scan_host and ata_host_remove, below,
4418 /* probes are done, now scan each port's disk(s) */
4419 DPRINTK("probe begin\n");
4420 for (i
= 0; i
< count
; i
++) {
4421 struct ata_port
*ap
= host_set
->ports
[i
];
4423 ata_scsi_scan_host(ap
);
4426 dev_set_drvdata(dev
, host_set
);
4428 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4429 return ent
->n_ports
; /* success */
4432 for (i
= 0; i
< count
; i
++) {
4433 ata_host_remove(host_set
->ports
[i
], 1);
4434 scsi_host_put(host_set
->ports
[i
]->host
);
4438 VPRINTK("EXIT, returning 0\n");
4443 * ata_host_set_remove - PCI layer callback for device removal
4444 * @host_set: ATA host set that was removed
4446 * Unregister all objects associated with this host set. Free those
4450 * Inherited from calling layer (may sleep).
4453 void ata_host_set_remove(struct ata_host_set
*host_set
)
4455 struct ata_port
*ap
;
4458 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4459 ap
= host_set
->ports
[i
];
4460 scsi_remove_host(ap
->host
);
4463 free_irq(host_set
->irq
, host_set
);
4465 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4466 ap
= host_set
->ports
[i
];
4468 ata_scsi_release(ap
->host
);
4470 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4471 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4473 if (ioaddr
->cmd_addr
== 0x1f0)
4474 release_region(0x1f0, 8);
4475 else if (ioaddr
->cmd_addr
== 0x170)
4476 release_region(0x170, 8);
4479 scsi_host_put(ap
->host
);
4482 if (host_set
->ops
->host_stop
)
4483 host_set
->ops
->host_stop(host_set
);
4489 * ata_scsi_release - SCSI layer callback hook for host unload
4490 * @host: libata host to be unloaded
4492 * Performs all duties necessary to shut down a libata port...
4493 * Kill port kthread, disable port, and release resources.
4496 * Inherited from SCSI layer.
4502 int ata_scsi_release(struct Scsi_Host
*host
)
4504 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4508 ap
->ops
->port_disable(ap
);
4509 ata_host_remove(ap
, 0);
4516 * ata_std_ports - initialize ioaddr with standard port offsets.
4517 * @ioaddr: IO address structure to be initialized
4519 * Utility function which initializes data_addr, error_addr,
4520 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4521 * device_addr, status_addr, and command_addr to standard offsets
4522 * relative to cmd_addr.
4524 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4527 void ata_std_ports(struct ata_ioports
*ioaddr
)
4529 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4530 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4531 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4532 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4533 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4534 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4535 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4536 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4537 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4538 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4541 static struct ata_probe_ent
*
4542 ata_probe_ent_alloc(struct device
*dev
, const struct ata_port_info
*port
)
4544 struct ata_probe_ent
*probe_ent
;
4546 probe_ent
= kzalloc(sizeof(*probe_ent
), GFP_KERNEL
);
4548 printk(KERN_ERR DRV_NAME
"(%s): out of memory\n",
4549 kobject_name(&(dev
->kobj
)));
4553 INIT_LIST_HEAD(&probe_ent
->node
);
4554 probe_ent
->dev
= dev
;
4556 probe_ent
->sht
= port
->sht
;
4557 probe_ent
->host_flags
= port
->host_flags
;
4558 probe_ent
->pio_mask
= port
->pio_mask
;
4559 probe_ent
->mwdma_mask
= port
->mwdma_mask
;
4560 probe_ent
->udma_mask
= port
->udma_mask
;
4561 probe_ent
->port_ops
= port
->port_ops
;
4570 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4572 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4574 pci_iounmap(pdev
, host_set
->mmio_base
);
4578 * ata_pci_init_native_mode - Initialize native-mode driver
4579 * @pdev: pci device to be initialized
4580 * @port: array[2] of pointers to port info structures.
4581 * @ports: bitmap of ports present
4583 * Utility function which allocates and initializes an
4584 * ata_probe_ent structure for a standard dual-port
4585 * PIO-based IDE controller. The returned ata_probe_ent
4586 * structure can be passed to ata_device_add(). The returned
4587 * ata_probe_ent structure should then be freed with kfree().
4589 * The caller need only pass the address of the primary port, the
4590 * secondary will be deduced automatically. If the device has non
4591 * standard secondary port mappings this function can be called twice,
4592 * once for each interface.
4595 struct ata_probe_ent
*
4596 ata_pci_init_native_mode(struct pci_dev
*pdev
, struct ata_port_info
**port
, int ports
)
4598 struct ata_probe_ent
*probe_ent
=
4599 ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
[0]);
4605 probe_ent
->irq
= pdev
->irq
;
4606 probe_ent
->irq_flags
= SA_SHIRQ
;
4607 probe_ent
->private_data
= port
[0]->private_data
;
4609 if (ports
& ATA_PORT_PRIMARY
) {
4610 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 0);
4611 probe_ent
->port
[p
].altstatus_addr
=
4612 probe_ent
->port
[p
].ctl_addr
=
4613 pci_resource_start(pdev
, 1) | ATA_PCI_CTL_OFS
;
4614 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4);
4615 ata_std_ports(&probe_ent
->port
[p
]);
4619 if (ports
& ATA_PORT_SECONDARY
) {
4620 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 2);
4621 probe_ent
->port
[p
].altstatus_addr
=
4622 probe_ent
->port
[p
].ctl_addr
=
4623 pci_resource_start(pdev
, 3) | ATA_PCI_CTL_OFS
;
4624 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4) + 8;
4625 ata_std_ports(&probe_ent
->port
[p
]);
4629 probe_ent
->n_ports
= p
;
4633 static struct ata_probe_ent
*ata_pci_init_legacy_port(struct pci_dev
*pdev
, struct ata_port_info
*port
, int port_num
)
4635 struct ata_probe_ent
*probe_ent
;
4637 probe_ent
= ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
);
4641 probe_ent
->legacy_mode
= 1;
4642 probe_ent
->n_ports
= 1;
4643 probe_ent
->hard_port_no
= port_num
;
4644 probe_ent
->private_data
= port
->private_data
;
4649 probe_ent
->irq
= 14;
4650 probe_ent
->port
[0].cmd_addr
= 0x1f0;
4651 probe_ent
->port
[0].altstatus_addr
=
4652 probe_ent
->port
[0].ctl_addr
= 0x3f6;
4655 probe_ent
->irq
= 15;
4656 probe_ent
->port
[0].cmd_addr
= 0x170;
4657 probe_ent
->port
[0].altstatus_addr
=
4658 probe_ent
->port
[0].ctl_addr
= 0x376;
4661 probe_ent
->port
[0].bmdma_addr
= pci_resource_start(pdev
, 4) + 8 * port_num
;
4662 ata_std_ports(&probe_ent
->port
[0]);
4667 * ata_pci_init_one - Initialize/register PCI IDE host controller
4668 * @pdev: Controller to be initialized
4669 * @port_info: Information from low-level host driver
4670 * @n_ports: Number of ports attached to host controller
4672 * This is a helper function which can be called from a driver's
4673 * xxx_init_one() probe function if the hardware uses traditional
4674 * IDE taskfile registers.
4676 * This function calls pci_enable_device(), reserves its register
4677 * regions, sets the dma mask, enables bus master mode, and calls
4681 * Inherited from PCI layer (may sleep).
4684 * Zero on success, negative on errno-based value on error.
4687 int ata_pci_init_one (struct pci_dev
*pdev
, struct ata_port_info
**port_info
,
4688 unsigned int n_ports
)
4690 struct ata_probe_ent
*probe_ent
= NULL
, *probe_ent2
= NULL
;
4691 struct ata_port_info
*port
[2];
4693 unsigned int legacy_mode
= 0;
4694 int disable_dev_on_err
= 1;
4699 port
[0] = port_info
[0];
4701 port
[1] = port_info
[1];
4705 if ((port
[0]->host_flags
& ATA_FLAG_NO_LEGACY
) == 0
4706 && (pdev
->class >> 8) == PCI_CLASS_STORAGE_IDE
) {
4707 /* TODO: What if one channel is in native mode ... */
4708 pci_read_config_byte(pdev
, PCI_CLASS_PROG
, &tmp8
);
4709 mask
= (1 << 2) | (1 << 0);
4710 if ((tmp8
& mask
) != mask
)
4711 legacy_mode
= (1 << 3);
4715 if ((!legacy_mode
) && (n_ports
> 2)) {
4716 printk(KERN_ERR
"ata: BUG: native mode, n_ports > 2\n");
4721 /* FIXME: Really for ATA it isn't safe because the device may be
4722 multi-purpose and we want to leave it alone if it was already
4723 enabled. Secondly for shared use as Arjan says we want refcounting
4725 Checking dev->is_enabled is insufficient as this is not set at
4726 boot for the primary video which is BIOS enabled
4729 rc
= pci_enable_device(pdev
);
4733 rc
= pci_request_regions(pdev
, DRV_NAME
);
4735 disable_dev_on_err
= 0;
4739 /* FIXME: Should use platform specific mappers for legacy port ranges */
4741 if (!request_region(0x1f0, 8, "libata")) {
4742 struct resource
*conflict
, res
;
4744 res
.end
= 0x1f0 + 8 - 1;
4745 conflict
= ____request_resource(&ioport_resource
, &res
);
4746 if (!strcmp(conflict
->name
, "libata"))
4747 legacy_mode
|= (1 << 0);
4749 disable_dev_on_err
= 0;
4750 printk(KERN_WARNING
"ata: 0x1f0 IDE port busy\n");
4753 legacy_mode
|= (1 << 0);
4755 if (!request_region(0x170, 8, "libata")) {
4756 struct resource
*conflict
, res
;
4758 res
.end
= 0x170 + 8 - 1;
4759 conflict
= ____request_resource(&ioport_resource
, &res
);
4760 if (!strcmp(conflict
->name
, "libata"))
4761 legacy_mode
|= (1 << 1);
4763 disable_dev_on_err
= 0;
4764 printk(KERN_WARNING
"ata: 0x170 IDE port busy\n");
4767 legacy_mode
|= (1 << 1);
4770 /* we have legacy mode, but all ports are unavailable */
4771 if (legacy_mode
== (1 << 3)) {
4773 goto err_out_regions
;
4776 rc
= pci_set_dma_mask(pdev
, ATA_DMA_MASK
);
4778 goto err_out_regions
;
4779 rc
= pci_set_consistent_dma_mask(pdev
, ATA_DMA_MASK
);
4781 goto err_out_regions
;
4784 if (legacy_mode
& (1 << 0))
4785 probe_ent
= ata_pci_init_legacy_port(pdev
, port
[0], 0);
4786 if (legacy_mode
& (1 << 1))
4787 probe_ent2
= ata_pci_init_legacy_port(pdev
, port
[1], 1);
4790 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
| ATA_PORT_SECONDARY
);
4792 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
);
4794 if (!probe_ent
&& !probe_ent2
) {
4796 goto err_out_regions
;
4799 pci_set_master(pdev
);
4801 /* FIXME: check ata_device_add return */
4803 if (legacy_mode
& (1 << 0))
4804 ata_device_add(probe_ent
);
4805 if (legacy_mode
& (1 << 1))
4806 ata_device_add(probe_ent2
);
4808 ata_device_add(probe_ent
);
4816 if (legacy_mode
& (1 << 0))
4817 release_region(0x1f0, 8);
4818 if (legacy_mode
& (1 << 1))
4819 release_region(0x170, 8);
4820 pci_release_regions(pdev
);
4822 if (disable_dev_on_err
)
4823 pci_disable_device(pdev
);
4828 * ata_pci_remove_one - PCI layer callback for device removal
4829 * @pdev: PCI device that was removed
4831 * PCI layer indicates to libata via this hook that
4832 * hot-unplug or module unload event has occurred.
4833 * Handle this by unregistering all objects associated
4834 * with this PCI device. Free those objects. Then finally
4835 * release PCI resources and disable device.
4838 * Inherited from PCI layer (may sleep).
4841 void ata_pci_remove_one (struct pci_dev
*pdev
)
4843 struct device
*dev
= pci_dev_to_dev(pdev
);
4844 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
4846 ata_host_set_remove(host_set
);
4847 pci_release_regions(pdev
);
4848 pci_disable_device(pdev
);
4849 dev_set_drvdata(dev
, NULL
);
4852 /* move to PCI subsystem */
4853 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
4855 unsigned long tmp
= 0;
4857 switch (bits
->width
) {
4860 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
4866 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
4872 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
4883 return (tmp
== bits
->val
) ? 1 : 0;
4885 #endif /* CONFIG_PCI */
4888 static int __init
ata_init(void)
4890 ata_wq
= create_workqueue("ata");
4894 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
4898 static void __exit
ata_exit(void)
4900 destroy_workqueue(ata_wq
);
4903 module_init(ata_init
);
4904 module_exit(ata_exit
);
4906 static unsigned long ratelimit_time
;
4907 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
4909 int ata_ratelimit(void)
4912 unsigned long flags
;
4914 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
4916 if (time_after(jiffies
, ratelimit_time
)) {
4918 ratelimit_time
= jiffies
+ (HZ
/5);
4922 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
4928 * libata is essentially a library of internal helper functions for
4929 * low-level ATA host controller drivers. As such, the API/ABI is
4930 * likely to change as new drivers are added and updated.
4931 * Do not depend on ABI/API stability.
4934 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
4935 EXPORT_SYMBOL_GPL(ata_std_ports
);
4936 EXPORT_SYMBOL_GPL(ata_device_add
);
4937 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
4938 EXPORT_SYMBOL_GPL(ata_sg_init
);
4939 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
4940 EXPORT_SYMBOL_GPL(ata_qc_complete
);
4941 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
4942 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
4943 EXPORT_SYMBOL_GPL(ata_tf_load
);
4944 EXPORT_SYMBOL_GPL(ata_tf_read
);
4945 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
4946 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
4947 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
4948 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
4949 EXPORT_SYMBOL_GPL(ata_check_status
);
4950 EXPORT_SYMBOL_GPL(ata_altstatus
);
4951 EXPORT_SYMBOL_GPL(ata_exec_command
);
4952 EXPORT_SYMBOL_GPL(ata_port_start
);
4953 EXPORT_SYMBOL_GPL(ata_port_stop
);
4954 EXPORT_SYMBOL_GPL(ata_host_stop
);
4955 EXPORT_SYMBOL_GPL(ata_interrupt
);
4956 EXPORT_SYMBOL_GPL(ata_qc_prep
);
4957 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
4958 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
4959 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
4960 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
4961 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
4962 EXPORT_SYMBOL_GPL(ata_port_probe
);
4963 EXPORT_SYMBOL_GPL(sata_phy_reset
);
4964 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
4965 EXPORT_SYMBOL_GPL(ata_bus_reset
);
4966 EXPORT_SYMBOL_GPL(ata_port_disable
);
4967 EXPORT_SYMBOL_GPL(ata_ratelimit
);
4968 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
4969 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
4970 EXPORT_SYMBOL_GPL(ata_scsi_error
);
4971 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
4972 EXPORT_SYMBOL_GPL(ata_scsi_release
);
4973 EXPORT_SYMBOL_GPL(ata_host_intr
);
4974 EXPORT_SYMBOL_GPL(ata_dev_classify
);
4975 EXPORT_SYMBOL_GPL(ata_dev_id_string
);
4976 EXPORT_SYMBOL_GPL(ata_dev_config
);
4977 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
4979 EXPORT_SYMBOL_GPL(ata_timing_compute
);
4980 EXPORT_SYMBOL_GPL(ata_timing_merge
);
4983 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
4984 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
4985 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
4986 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
4987 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
4988 #endif /* CONFIG_PCI */