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
);
77 static unsigned int ata_unique_id
= 1;
78 static struct workqueue_struct
*ata_wq
;
80 int atapi_enabled
= 0;
81 module_param(atapi_enabled
, int, 0444);
82 MODULE_PARM_DESC(atapi_enabled
, "Enable discovery of ATAPI devices (0=off, 1=on)");
84 MODULE_AUTHOR("Jeff Garzik");
85 MODULE_DESCRIPTION("Library module for ATA devices");
86 MODULE_LICENSE("GPL");
87 MODULE_VERSION(DRV_VERSION
);
90 * ata_tf_load_pio - send taskfile registers to host controller
91 * @ap: Port to which output is sent
92 * @tf: ATA taskfile register set
94 * Outputs ATA taskfile to standard ATA host controller.
97 * Inherited from caller.
100 static void ata_tf_load_pio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
102 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
103 unsigned int is_addr
= tf
->flags
& ATA_TFLAG_ISADDR
;
105 if (tf
->ctl
!= ap
->last_ctl
) {
106 outb(tf
->ctl
, ioaddr
->ctl_addr
);
107 ap
->last_ctl
= tf
->ctl
;
111 if (is_addr
&& (tf
->flags
& ATA_TFLAG_LBA48
)) {
112 outb(tf
->hob_feature
, ioaddr
->feature_addr
);
113 outb(tf
->hob_nsect
, ioaddr
->nsect_addr
);
114 outb(tf
->hob_lbal
, ioaddr
->lbal_addr
);
115 outb(tf
->hob_lbam
, ioaddr
->lbam_addr
);
116 outb(tf
->hob_lbah
, ioaddr
->lbah_addr
);
117 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
126 outb(tf
->feature
, ioaddr
->feature_addr
);
127 outb(tf
->nsect
, ioaddr
->nsect_addr
);
128 outb(tf
->lbal
, ioaddr
->lbal_addr
);
129 outb(tf
->lbam
, ioaddr
->lbam_addr
);
130 outb(tf
->lbah
, ioaddr
->lbah_addr
);
131 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
139 if (tf
->flags
& ATA_TFLAG_DEVICE
) {
140 outb(tf
->device
, ioaddr
->device_addr
);
141 VPRINTK("device 0x%X\n", tf
->device
);
148 * ata_tf_load_mmio - send taskfile registers to host controller
149 * @ap: Port to which output is sent
150 * @tf: ATA taskfile register set
152 * Outputs ATA taskfile to standard ATA host controller using MMIO.
155 * Inherited from caller.
158 static void ata_tf_load_mmio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
160 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
161 unsigned int is_addr
= tf
->flags
& ATA_TFLAG_ISADDR
;
163 if (tf
->ctl
!= ap
->last_ctl
) {
164 writeb(tf
->ctl
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
165 ap
->last_ctl
= tf
->ctl
;
169 if (is_addr
&& (tf
->flags
& ATA_TFLAG_LBA48
)) {
170 writeb(tf
->hob_feature
, (void __iomem
*) ioaddr
->feature_addr
);
171 writeb(tf
->hob_nsect
, (void __iomem
*) ioaddr
->nsect_addr
);
172 writeb(tf
->hob_lbal
, (void __iomem
*) ioaddr
->lbal_addr
);
173 writeb(tf
->hob_lbam
, (void __iomem
*) ioaddr
->lbam_addr
);
174 writeb(tf
->hob_lbah
, (void __iomem
*) ioaddr
->lbah_addr
);
175 VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
184 writeb(tf
->feature
, (void __iomem
*) ioaddr
->feature_addr
);
185 writeb(tf
->nsect
, (void __iomem
*) ioaddr
->nsect_addr
);
186 writeb(tf
->lbal
, (void __iomem
*) ioaddr
->lbal_addr
);
187 writeb(tf
->lbam
, (void __iomem
*) ioaddr
->lbam_addr
);
188 writeb(tf
->lbah
, (void __iomem
*) ioaddr
->lbah_addr
);
189 VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
197 if (tf
->flags
& ATA_TFLAG_DEVICE
) {
198 writeb(tf
->device
, (void __iomem
*) ioaddr
->device_addr
);
199 VPRINTK("device 0x%X\n", tf
->device
);
207 * ata_tf_load - send taskfile registers to host controller
208 * @ap: Port to which output is sent
209 * @tf: ATA taskfile register set
211 * Outputs ATA taskfile to standard ATA host controller using MMIO
212 * or PIO as indicated by the ATA_FLAG_MMIO flag.
213 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
214 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
215 * hob_lbal, hob_lbam, and hob_lbah.
217 * This function waits for idle (!BUSY and !DRQ) after writing
218 * registers. If the control register has a new value, this
219 * function also waits for idle after writing control and before
220 * writing the remaining registers.
222 * May be used as the tf_load() entry in ata_port_operations.
225 * Inherited from caller.
227 void ata_tf_load(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
229 if (ap
->flags
& ATA_FLAG_MMIO
)
230 ata_tf_load_mmio(ap
, tf
);
232 ata_tf_load_pio(ap
, tf
);
236 * ata_exec_command_pio - issue ATA command to host controller
237 * @ap: port to which command is being issued
238 * @tf: ATA taskfile register set
240 * Issues PIO write to ATA command register, with proper
241 * synchronization with interrupt handler / other threads.
244 * spin_lock_irqsave(host_set lock)
247 static void ata_exec_command_pio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
249 DPRINTK("ata%u: cmd 0x%X\n", ap
->id
, tf
->command
);
251 outb(tf
->command
, ap
->ioaddr
.command_addr
);
257 * ata_exec_command_mmio - issue ATA command to host controller
258 * @ap: port to which command is being issued
259 * @tf: ATA taskfile register set
261 * Issues MMIO write to ATA command register, with proper
262 * synchronization with interrupt handler / other threads.
265 * spin_lock_irqsave(host_set lock)
268 static void ata_exec_command_mmio(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
270 DPRINTK("ata%u: cmd 0x%X\n", ap
->id
, tf
->command
);
272 writeb(tf
->command
, (void __iomem
*) ap
->ioaddr
.command_addr
);
278 * ata_exec_command - issue ATA command to host controller
279 * @ap: port to which command is being issued
280 * @tf: ATA taskfile register set
282 * Issues PIO/MMIO write to ATA command register, with proper
283 * synchronization with interrupt handler / other threads.
286 * spin_lock_irqsave(host_set lock)
288 void ata_exec_command(struct ata_port
*ap
, const struct ata_taskfile
*tf
)
290 if (ap
->flags
& ATA_FLAG_MMIO
)
291 ata_exec_command_mmio(ap
, tf
);
293 ata_exec_command_pio(ap
, tf
);
297 * ata_tf_to_host - issue ATA taskfile to host controller
298 * @ap: port to which command is being issued
299 * @tf: ATA taskfile register set
301 * Issues ATA taskfile register set to ATA host controller,
302 * with proper synchronization with interrupt handler and
306 * spin_lock_irqsave(host_set lock)
309 static inline void ata_tf_to_host(struct ata_port
*ap
,
310 const struct ata_taskfile
*tf
)
312 ap
->ops
->tf_load(ap
, tf
);
313 ap
->ops
->exec_command(ap
, tf
);
317 * ata_tf_read_pio - input device's ATA taskfile shadow registers
318 * @ap: Port from which input is read
319 * @tf: ATA taskfile register set for storing input
321 * Reads ATA taskfile registers for currently-selected device
325 * Inherited from caller.
328 static void ata_tf_read_pio(struct ata_port
*ap
, struct ata_taskfile
*tf
)
330 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
332 tf
->command
= ata_check_status(ap
);
333 tf
->feature
= inb(ioaddr
->error_addr
);
334 tf
->nsect
= inb(ioaddr
->nsect_addr
);
335 tf
->lbal
= inb(ioaddr
->lbal_addr
);
336 tf
->lbam
= inb(ioaddr
->lbam_addr
);
337 tf
->lbah
= inb(ioaddr
->lbah_addr
);
338 tf
->device
= inb(ioaddr
->device_addr
);
340 if (tf
->flags
& ATA_TFLAG_LBA48
) {
341 outb(tf
->ctl
| ATA_HOB
, ioaddr
->ctl_addr
);
342 tf
->hob_feature
= inb(ioaddr
->error_addr
);
343 tf
->hob_nsect
= inb(ioaddr
->nsect_addr
);
344 tf
->hob_lbal
= inb(ioaddr
->lbal_addr
);
345 tf
->hob_lbam
= inb(ioaddr
->lbam_addr
);
346 tf
->hob_lbah
= inb(ioaddr
->lbah_addr
);
351 * ata_tf_read_mmio - input device's ATA taskfile shadow registers
352 * @ap: Port from which input is read
353 * @tf: ATA taskfile register set for storing input
355 * Reads ATA taskfile registers for currently-selected device
359 * Inherited from caller.
362 static void ata_tf_read_mmio(struct ata_port
*ap
, struct ata_taskfile
*tf
)
364 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
366 tf
->command
= ata_check_status(ap
);
367 tf
->feature
= readb((void __iomem
*)ioaddr
->error_addr
);
368 tf
->nsect
= readb((void __iomem
*)ioaddr
->nsect_addr
);
369 tf
->lbal
= readb((void __iomem
*)ioaddr
->lbal_addr
);
370 tf
->lbam
= readb((void __iomem
*)ioaddr
->lbam_addr
);
371 tf
->lbah
= readb((void __iomem
*)ioaddr
->lbah_addr
);
372 tf
->device
= readb((void __iomem
*)ioaddr
->device_addr
);
374 if (tf
->flags
& ATA_TFLAG_LBA48
) {
375 writeb(tf
->ctl
| ATA_HOB
, (void __iomem
*) ap
->ioaddr
.ctl_addr
);
376 tf
->hob_feature
= readb((void __iomem
*)ioaddr
->error_addr
);
377 tf
->hob_nsect
= readb((void __iomem
*)ioaddr
->nsect_addr
);
378 tf
->hob_lbal
= readb((void __iomem
*)ioaddr
->lbal_addr
);
379 tf
->hob_lbam
= readb((void __iomem
*)ioaddr
->lbam_addr
);
380 tf
->hob_lbah
= readb((void __iomem
*)ioaddr
->lbah_addr
);
386 * ata_tf_read - input device's ATA taskfile shadow registers
387 * @ap: Port from which input is read
388 * @tf: ATA taskfile register set for storing input
390 * Reads ATA taskfile registers for currently-selected device
393 * Reads nsect, lbal, lbam, lbah, and device. If ATA_TFLAG_LBA48
394 * is set, also reads the hob registers.
396 * May be used as the tf_read() entry in ata_port_operations.
399 * Inherited from caller.
401 void ata_tf_read(struct ata_port
*ap
, struct ata_taskfile
*tf
)
403 if (ap
->flags
& ATA_FLAG_MMIO
)
404 ata_tf_read_mmio(ap
, tf
);
406 ata_tf_read_pio(ap
, tf
);
410 * ata_check_status_pio - Read device status reg & clear interrupt
411 * @ap: port where the device is
413 * Reads ATA taskfile status register for currently-selected device
414 * and return its value. This also clears pending interrupts
418 * Inherited from caller.
420 static u8
ata_check_status_pio(struct ata_port
*ap
)
422 return inb(ap
->ioaddr
.status_addr
);
426 * ata_check_status_mmio - Read device status reg & clear interrupt
427 * @ap: port where the device is
429 * Reads ATA taskfile status register for currently-selected device
430 * via MMIO and return its value. This also clears pending interrupts
434 * Inherited from caller.
436 static u8
ata_check_status_mmio(struct ata_port
*ap
)
438 return readb((void __iomem
*) ap
->ioaddr
.status_addr
);
443 * ata_check_status - Read device status reg & clear interrupt
444 * @ap: port where the device is
446 * Reads ATA taskfile status register for currently-selected device
447 * and return its value. This also clears pending interrupts
450 * May be used as the check_status() entry in ata_port_operations.
453 * Inherited from caller.
455 u8
ata_check_status(struct ata_port
*ap
)
457 if (ap
->flags
& ATA_FLAG_MMIO
)
458 return ata_check_status_mmio(ap
);
459 return ata_check_status_pio(ap
);
464 * ata_altstatus - Read device alternate status reg
465 * @ap: port where the device is
467 * Reads ATA taskfile alternate status register for
468 * currently-selected device and return its value.
470 * Note: may NOT be used as the check_altstatus() entry in
471 * ata_port_operations.
474 * Inherited from caller.
476 u8
ata_altstatus(struct ata_port
*ap
)
478 if (ap
->ops
->check_altstatus
)
479 return ap
->ops
->check_altstatus(ap
);
481 if (ap
->flags
& ATA_FLAG_MMIO
)
482 return readb((void __iomem
*)ap
->ioaddr
.altstatus_addr
);
483 return inb(ap
->ioaddr
.altstatus_addr
);
488 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
489 * @tf: Taskfile to convert
490 * @fis: Buffer into which data will output
491 * @pmp: Port multiplier port
493 * Converts a standard ATA taskfile to a Serial ATA
494 * FIS structure (Register - Host to Device).
497 * Inherited from caller.
500 void ata_tf_to_fis(const struct ata_taskfile
*tf
, u8
*fis
, u8 pmp
)
502 fis
[0] = 0x27; /* Register - Host to Device FIS */
503 fis
[1] = (pmp
& 0xf) | (1 << 7); /* Port multiplier number,
504 bit 7 indicates Command FIS */
505 fis
[2] = tf
->command
;
506 fis
[3] = tf
->feature
;
513 fis
[8] = tf
->hob_lbal
;
514 fis
[9] = tf
->hob_lbam
;
515 fis
[10] = tf
->hob_lbah
;
516 fis
[11] = tf
->hob_feature
;
519 fis
[13] = tf
->hob_nsect
;
530 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
531 * @fis: Buffer from which data will be input
532 * @tf: Taskfile to output
534 * Converts a serial ATA FIS structure to a standard ATA taskfile.
537 * Inherited from caller.
540 void ata_tf_from_fis(const u8
*fis
, struct ata_taskfile
*tf
)
542 tf
->command
= fis
[2]; /* status */
543 tf
->feature
= fis
[3]; /* error */
550 tf
->hob_lbal
= fis
[8];
551 tf
->hob_lbam
= fis
[9];
552 tf
->hob_lbah
= fis
[10];
555 tf
->hob_nsect
= fis
[13];
558 static const u8 ata_rw_cmds
[] = {
562 ATA_CMD_READ_MULTI_EXT
,
563 ATA_CMD_WRITE_MULTI_EXT
,
567 ATA_CMD_WRITE_MULTI_FUA_EXT
,
571 ATA_CMD_PIO_READ_EXT
,
572 ATA_CMD_PIO_WRITE_EXT
,
585 ATA_CMD_WRITE_FUA_EXT
589 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
590 * @qc: command to examine and configure
592 * Examine the device configuration and tf->flags to calculate
593 * the proper read/write commands and protocol to use.
598 int ata_rwcmd_protocol(struct ata_queued_cmd
*qc
)
600 struct ata_taskfile
*tf
= &qc
->tf
;
601 struct ata_device
*dev
= qc
->dev
;
604 int index
, fua
, lba48
, write
;
606 fua
= (tf
->flags
& ATA_TFLAG_FUA
) ? 4 : 0;
607 lba48
= (tf
->flags
& ATA_TFLAG_LBA48
) ? 2 : 0;
608 write
= (tf
->flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
610 if (dev
->flags
& ATA_DFLAG_PIO
) {
611 tf
->protocol
= ATA_PROT_PIO
;
612 index
= dev
->multi_count
? 0 : 8;
613 } else if (lba48
&& (qc
->ap
->flags
& ATA_FLAG_PIO_LBA48
)) {
614 /* Unable to use DMA due to host limitation */
615 tf
->protocol
= ATA_PROT_PIO
;
616 index
= dev
->multi_count
? 0 : 4;
618 tf
->protocol
= ATA_PROT_DMA
;
622 cmd
= ata_rw_cmds
[index
+ fua
+ lba48
+ write
];
630 static const char * const xfer_mode_str
[] = {
650 * ata_udma_string - convert UDMA bit offset to string
651 * @mask: mask of bits supported; only highest bit counts.
653 * Determine string which represents the highest speed
654 * (highest bit in @udma_mask).
660 * Constant C string representing highest speed listed in
661 * @udma_mask, or the constant C string "<n/a>".
664 static const char *ata_mode_string(unsigned int mask
)
668 for (i
= 7; i
>= 0; i
--)
671 for (i
= ATA_SHIFT_MWDMA
+ 2; i
>= ATA_SHIFT_MWDMA
; i
--)
674 for (i
= ATA_SHIFT_PIO
+ 4; i
>= ATA_SHIFT_PIO
; i
--)
681 return xfer_mode_str
[i
];
685 * ata_pio_devchk - PATA device presence detection
686 * @ap: ATA channel to examine
687 * @device: Device to examine (starting at zero)
689 * This technique was originally described in
690 * Hale Landis's ATADRVR (www.ata-atapi.com), and
691 * later found its way into the ATA/ATAPI spec.
693 * Write a pattern to the ATA shadow registers,
694 * and if a device is present, it will respond by
695 * correctly storing and echoing back the
696 * ATA shadow register contents.
702 static unsigned int ata_pio_devchk(struct ata_port
*ap
,
705 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
708 ap
->ops
->dev_select(ap
, device
);
710 outb(0x55, ioaddr
->nsect_addr
);
711 outb(0xaa, ioaddr
->lbal_addr
);
713 outb(0xaa, ioaddr
->nsect_addr
);
714 outb(0x55, ioaddr
->lbal_addr
);
716 outb(0x55, ioaddr
->nsect_addr
);
717 outb(0xaa, ioaddr
->lbal_addr
);
719 nsect
= inb(ioaddr
->nsect_addr
);
720 lbal
= inb(ioaddr
->lbal_addr
);
722 if ((nsect
== 0x55) && (lbal
== 0xaa))
723 return 1; /* we found a device */
725 return 0; /* nothing found */
729 * ata_mmio_devchk - PATA device presence detection
730 * @ap: ATA channel to examine
731 * @device: Device to examine (starting at zero)
733 * This technique was originally described in
734 * Hale Landis's ATADRVR (www.ata-atapi.com), and
735 * later found its way into the ATA/ATAPI spec.
737 * Write a pattern to the ATA shadow registers,
738 * and if a device is present, it will respond by
739 * correctly storing and echoing back the
740 * ATA shadow register contents.
746 static unsigned int ata_mmio_devchk(struct ata_port
*ap
,
749 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
752 ap
->ops
->dev_select(ap
, device
);
754 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
755 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
757 writeb(0xaa, (void __iomem
*) ioaddr
->nsect_addr
);
758 writeb(0x55, (void __iomem
*) ioaddr
->lbal_addr
);
760 writeb(0x55, (void __iomem
*) ioaddr
->nsect_addr
);
761 writeb(0xaa, (void __iomem
*) ioaddr
->lbal_addr
);
763 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
764 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
766 if ((nsect
== 0x55) && (lbal
== 0xaa))
767 return 1; /* we found a device */
769 return 0; /* nothing found */
773 * ata_devchk - PATA device presence detection
774 * @ap: ATA channel to examine
775 * @device: Device to examine (starting at zero)
777 * Dispatch ATA device presence detection, depending
778 * on whether we are using PIO or MMIO to talk to the
779 * ATA shadow registers.
785 static unsigned int ata_devchk(struct ata_port
*ap
,
788 if (ap
->flags
& ATA_FLAG_MMIO
)
789 return ata_mmio_devchk(ap
, device
);
790 return ata_pio_devchk(ap
, device
);
794 * ata_dev_classify - determine device type based on ATA-spec signature
795 * @tf: ATA taskfile register set for device to be identified
797 * Determine from taskfile register contents whether a device is
798 * ATA or ATAPI, as per "Signature and persistence" section
799 * of ATA/PI spec (volume 1, sect 5.14).
805 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
806 * the event of failure.
809 unsigned int ata_dev_classify(const struct ata_taskfile
*tf
)
811 /* Apple's open source Darwin code hints that some devices only
812 * put a proper signature into the LBA mid/high registers,
813 * So, we only check those. It's sufficient for uniqueness.
816 if (((tf
->lbam
== 0) && (tf
->lbah
== 0)) ||
817 ((tf
->lbam
== 0x3c) && (tf
->lbah
== 0xc3))) {
818 DPRINTK("found ATA device by sig\n");
822 if (((tf
->lbam
== 0x14) && (tf
->lbah
== 0xeb)) ||
823 ((tf
->lbam
== 0x69) && (tf
->lbah
== 0x96))) {
824 DPRINTK("found ATAPI device by sig\n");
825 return ATA_DEV_ATAPI
;
828 DPRINTK("unknown device\n");
829 return ATA_DEV_UNKNOWN
;
833 * ata_dev_try_classify - Parse returned ATA device signature
834 * @ap: ATA channel to examine
835 * @device: Device to examine (starting at zero)
837 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
838 * an ATA/ATAPI-defined set of values is placed in the ATA
839 * shadow registers, indicating the results of device detection
842 * Select the ATA device, and read the values from the ATA shadow
843 * registers. Then parse according to the Error register value,
844 * and the spec-defined values examined by ata_dev_classify().
850 static u8
ata_dev_try_classify(struct ata_port
*ap
, unsigned int device
)
852 struct ata_device
*dev
= &ap
->device
[device
];
853 struct ata_taskfile tf
;
857 ap
->ops
->dev_select(ap
, device
);
859 memset(&tf
, 0, sizeof(tf
));
861 ap
->ops
->tf_read(ap
, &tf
);
864 dev
->class = ATA_DEV_NONE
;
866 /* see if device passed diags */
869 else if ((device
== 0) && (err
== 0x81))
874 /* determine if device if ATA or ATAPI */
875 class = ata_dev_classify(&tf
);
876 if (class == ATA_DEV_UNKNOWN
)
878 if ((class == ATA_DEV_ATA
) && (ata_chk_status(ap
) == 0))
887 * ata_dev_id_string - Convert IDENTIFY DEVICE page into string
888 * @id: IDENTIFY DEVICE results we will examine
889 * @s: string into which data is output
890 * @ofs: offset into identify device page
891 * @len: length of string to return. must be an even number.
893 * The strings in the IDENTIFY DEVICE page are broken up into
894 * 16-bit chunks. Run through the string, and output each
895 * 8-bit chunk linearly, regardless of platform.
901 void ata_dev_id_string(const u16
*id
, unsigned char *s
,
902 unsigned int ofs
, unsigned int len
)
922 * ata_noop_dev_select - Select device 0/1 on ATA bus
923 * @ap: ATA channel to manipulate
924 * @device: ATA device (numbered from zero) to select
926 * This function performs no actual function.
928 * May be used as the dev_select() entry in ata_port_operations.
933 void ata_noop_dev_select (struct ata_port
*ap
, unsigned int device
)
939 * ata_std_dev_select - Select device 0/1 on ATA bus
940 * @ap: ATA channel to manipulate
941 * @device: ATA device (numbered from zero) to select
943 * Use the method defined in the ATA specification to
944 * make either device 0, or device 1, active on the
945 * ATA channel. Works with both PIO and MMIO.
947 * May be used as the dev_select() entry in ata_port_operations.
953 void ata_std_dev_select (struct ata_port
*ap
, unsigned int device
)
958 tmp
= ATA_DEVICE_OBS
;
960 tmp
= ATA_DEVICE_OBS
| ATA_DEV1
;
962 if (ap
->flags
& ATA_FLAG_MMIO
) {
963 writeb(tmp
, (void __iomem
*) ap
->ioaddr
.device_addr
);
965 outb(tmp
, ap
->ioaddr
.device_addr
);
967 ata_pause(ap
); /* needed; also flushes, for mmio */
971 * ata_dev_select - Select device 0/1 on ATA bus
972 * @ap: ATA channel to manipulate
973 * @device: ATA device (numbered from zero) to select
974 * @wait: non-zero to wait for Status register BSY bit to clear
975 * @can_sleep: non-zero if context allows sleeping
977 * Use the method defined in the ATA specification to
978 * make either device 0, or device 1, active on the
981 * This is a high-level version of ata_std_dev_select(),
982 * which additionally provides the services of inserting
983 * the proper pauses and status polling, where needed.
989 void ata_dev_select(struct ata_port
*ap
, unsigned int device
,
990 unsigned int wait
, unsigned int can_sleep
)
992 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
993 ap
->id
, device
, wait
);
998 ap
->ops
->dev_select(ap
, device
);
1001 if (can_sleep
&& ap
->device
[device
].class == ATA_DEV_ATAPI
)
1008 * ata_dump_id - IDENTIFY DEVICE info debugging output
1009 * @dev: Device whose IDENTIFY DEVICE page we will dump
1011 * Dump selected 16-bit words from a detected device's
1012 * IDENTIFY PAGE page.
1018 static inline void ata_dump_id(const struct ata_device
*dev
)
1020 DPRINTK("49==0x%04x "
1030 DPRINTK("80==0x%04x "
1040 DPRINTK("88==0x%04x "
1047 * Compute the PIO modes available for this device. This is not as
1048 * trivial as it seems if we must consider early devices correctly.
1050 * FIXME: pre IDE drive timing (do we care ?).
1053 static unsigned int ata_pio_modes(const struct ata_device
*adev
)
1057 /* Usual case. Word 53 indicates word 64 is valid */
1058 if (adev
->id
[ATA_ID_FIELD_VALID
] & (1 << 1)) {
1059 modes
= adev
->id
[ATA_ID_PIO_MODES
] & 0x03;
1065 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
1066 number for the maximum. Turn it into a mask and return it */
1067 modes
= (2 << ((adev
->id
[ATA_ID_OLD_PIO_MODES
] >> 8) & 0xFF)) - 1 ;
1069 /* But wait.. there's more. Design your standards by committee and
1070 you too can get a free iordy field to process. However its the
1071 speeds not the modes that are supported... Note drivers using the
1072 timing API will get this right anyway */
1075 void ata_qc_complete_internal(struct ata_queued_cmd
*qc
)
1077 struct completion
*waiting
= qc
->private_data
;
1079 qc
->ap
->ops
->tf_read(qc
->ap
, &qc
->tf
);
1084 * ata_exec_internal - execute libata internal command
1085 * @ap: Port to which the command is sent
1086 * @dev: Device to which the command is sent
1087 * @tf: Taskfile registers for the command and the result
1088 * @dma_dir: Data tranfer direction of the command
1089 * @buf: Data buffer of the command
1090 * @buflen: Length of data buffer
1092 * Executes libata internal command with timeout. @tf contains
1093 * command on entry and result on return. Timeout and error
1094 * conditions are reported via return value. No recovery action
1095 * is taken after a command times out. It's caller's duty to
1096 * clean up after timeout.
1099 * None. Should be called with kernel context, might sleep.
1103 ata_exec_internal(struct ata_port
*ap
, struct ata_device
*dev
,
1104 struct ata_taskfile
*tf
,
1105 int dma_dir
, void *buf
, unsigned int buflen
)
1107 u8 command
= tf
->command
;
1108 struct ata_queued_cmd
*qc
;
1109 DECLARE_COMPLETION(wait
);
1110 unsigned long flags
;
1111 unsigned int err_mask
;
1113 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1115 qc
= ata_qc_new_init(ap
, dev
);
1119 qc
->dma_dir
= dma_dir
;
1120 if (dma_dir
!= DMA_NONE
) {
1121 ata_sg_init_one(qc
, buf
, buflen
);
1122 qc
->nsect
= buflen
/ ATA_SECT_SIZE
;
1125 qc
->private_data
= &wait
;
1126 qc
->complete_fn
= ata_qc_complete_internal
;
1128 if (ata_qc_issue(qc
)) {
1129 qc
->err_mask
= AC_ERR_OTHER
;
1130 ata_qc_complete(qc
);
1133 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1135 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1136 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1138 /* We're racing with irq here. If we lose, the
1139 * following test prevents us from completing the qc
1140 * again. If completion irq occurs after here but
1141 * before the caller cleans up, it will result in a
1142 * spurious interrupt. We can live with that.
1144 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1145 qc
->err_mask
= AC_ERR_TIMEOUT
;
1146 ata_qc_complete(qc
);
1147 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1151 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1155 err_mask
= qc
->err_mask
;
1163 * ata_pio_need_iordy - check if iordy needed
1166 * Check if the current speed of the device requires IORDY. Used
1167 * by various controllers for chip configuration.
1170 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1173 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1180 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1182 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1183 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1184 /* Is the speed faster than the drive allows non IORDY ? */
1186 /* This is cycle times not frequency - watch the logic! */
1187 if (pio
> 240) /* PIO2 is 240nS per cycle */
1196 * ata_dev_identify - obtain IDENTIFY x DEVICE page
1197 * @ap: port on which device we wish to probe resides
1198 * @device: device bus address, starting at zero
1200 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
1201 * command, and read back the 512-byte device information page.
1202 * The device information page is fed to us via the standard
1203 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
1204 * using standard PIO-IN paths)
1206 * After reading the device information page, we use several
1207 * bits of information from it to initialize data structures
1208 * that will be used during the lifetime of the ata_device.
1209 * Other data from the info page is used to disqualify certain
1210 * older ATA devices we do not wish to support.
1213 * Inherited from caller. Some functions called by this function
1214 * obtain the host_set lock.
1217 static void ata_dev_identify(struct ata_port
*ap
, unsigned int device
)
1219 struct ata_device
*dev
= &ap
->device
[device
];
1220 unsigned int major_version
;
1222 unsigned long xfer_modes
;
1223 unsigned int using_edd
;
1224 struct ata_taskfile tf
;
1225 unsigned int err_mask
;
1228 if (!ata_dev_present(dev
)) {
1229 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1234 if (ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
1239 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, device
);
1241 assert (dev
->class == ATA_DEV_ATA
|| dev
->class == ATA_DEV_ATAPI
||
1242 dev
->class == ATA_DEV_NONE
);
1244 ata_dev_select(ap
, device
, 1, 1); /* select device 0/1 */
1247 ata_tf_init(ap
, &tf
, device
);
1249 if (dev
->class == ATA_DEV_ATA
) {
1250 tf
.command
= ATA_CMD_ID_ATA
;
1251 DPRINTK("do ATA identify\n");
1253 tf
.command
= ATA_CMD_ID_ATAPI
;
1254 DPRINTK("do ATAPI identify\n");
1257 tf
.protocol
= ATA_PROT_PIO
;
1259 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1260 dev
->id
, sizeof(dev
->id
));
1263 if (err_mask
& ~AC_ERR_DEV
)
1267 * arg! EDD works for all test cases, but seems to return
1268 * the ATA signature for some ATAPI devices. Until the
1269 * reason for this is found and fixed, we fix up the mess
1270 * here. If IDENTIFY DEVICE returns command aborted
1271 * (as ATAPI devices do), then we issue an
1272 * IDENTIFY PACKET DEVICE.
1274 * ATA software reset (SRST, the default) does not appear
1275 * to have this problem.
1277 if ((using_edd
) && (dev
->class == ATA_DEV_ATA
)) {
1278 u8 err
= tf
.feature
;
1279 if (err
& ATA_ABORTED
) {
1280 dev
->class = ATA_DEV_ATAPI
;
1287 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
1289 /* print device capabilities */
1290 printk(KERN_DEBUG
"ata%u: dev %u cfg "
1291 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1292 ap
->id
, device
, dev
->id
[49],
1293 dev
->id
[82], dev
->id
[83], dev
->id
[84],
1294 dev
->id
[85], dev
->id
[86], dev
->id
[87],
1298 * common ATA, ATAPI feature tests
1301 /* we require DMA support (bits 8 of word 49) */
1302 if (!ata_id_has_dma(dev
->id
)) {
1303 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1307 /* quick-n-dirty find max transfer mode; for printk only */
1308 xfer_modes
= dev
->id
[ATA_ID_UDMA_MODES
];
1310 xfer_modes
= (dev
->id
[ATA_ID_MWDMA_MODES
]) << ATA_SHIFT_MWDMA
;
1312 xfer_modes
= ata_pio_modes(dev
);
1316 /* ATA-specific feature tests */
1317 if (dev
->class == ATA_DEV_ATA
) {
1318 if (!ata_id_is_ata(dev
->id
)) /* sanity check */
1321 /* get major version */
1322 tmp
= dev
->id
[ATA_ID_MAJOR_VER
];
1323 for (major_version
= 14; major_version
>= 1; major_version
--)
1324 if (tmp
& (1 << major_version
))
1328 * The exact sequence expected by certain pre-ATA4 drives is:
1331 * INITIALIZE DEVICE PARAMETERS
1333 * Some drives were very specific about that exact sequence.
1335 if (major_version
< 4 || (!ata_id_has_lba(dev
->id
))) {
1336 ata_dev_init_params(ap
, dev
);
1338 /* current CHS translation info (id[53-58]) might be
1339 * changed. reread the identify device info.
1341 ata_dev_reread_id(ap
, dev
);
1344 if (ata_id_has_lba(dev
->id
)) {
1345 dev
->flags
|= ATA_DFLAG_LBA
;
1347 if (ata_id_has_lba48(dev
->id
)) {
1348 dev
->flags
|= ATA_DFLAG_LBA48
;
1349 dev
->n_sectors
= ata_id_u64(dev
->id
, 100);
1351 dev
->n_sectors
= ata_id_u32(dev
->id
, 60);
1354 /* print device info to dmesg */
1355 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1358 ata_mode_string(xfer_modes
),
1359 (unsigned long long)dev
->n_sectors
,
1360 dev
->flags
& ATA_DFLAG_LBA48
? " LBA48" : " LBA");
1364 /* Default translation */
1365 dev
->cylinders
= dev
->id
[1];
1366 dev
->heads
= dev
->id
[3];
1367 dev
->sectors
= dev
->id
[6];
1368 dev
->n_sectors
= dev
->cylinders
* dev
->heads
* dev
->sectors
;
1370 if (ata_id_current_chs_valid(dev
->id
)) {
1371 /* Current CHS translation is valid. */
1372 dev
->cylinders
= dev
->id
[54];
1373 dev
->heads
= dev
->id
[55];
1374 dev
->sectors
= dev
->id
[56];
1376 dev
->n_sectors
= ata_id_u32(dev
->id
, 57);
1379 /* print device info to dmesg */
1380 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1383 ata_mode_string(xfer_modes
),
1384 (unsigned long long)dev
->n_sectors
,
1385 (int)dev
->cylinders
, (int)dev
->heads
, (int)dev
->sectors
);
1389 ap
->host
->max_cmd_len
= 16;
1392 /* ATAPI-specific feature tests */
1393 else if (dev
->class == ATA_DEV_ATAPI
) {
1394 if (ata_id_is_ata(dev
->id
)) /* sanity check */
1397 rc
= atapi_cdb_len(dev
->id
);
1398 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1399 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1402 ap
->cdb_len
= (unsigned int) rc
;
1403 ap
->host
->max_cmd_len
= (unsigned char) ap
->cdb_len
;
1405 /* print device info to dmesg */
1406 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1408 ata_mode_string(xfer_modes
));
1411 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1415 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1418 dev
->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1419 DPRINTK("EXIT, err\n");
1423 static inline u8
ata_dev_knobble(const struct ata_port
*ap
)
1425 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(ap
->device
->id
)));
1429 * ata_dev_config - Run device specific handlers and check for
1430 * SATA->PATA bridges
1437 void ata_dev_config(struct ata_port
*ap
, unsigned int i
)
1439 /* limit bridge transfers to udma5, 200 sectors */
1440 if (ata_dev_knobble(ap
)) {
1441 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1442 ap
->id
, ap
->device
->devno
);
1443 ap
->udma_mask
&= ATA_UDMA5
;
1444 ap
->host
->max_sectors
= ATA_MAX_SECTORS
;
1445 ap
->host
->hostt
->max_sectors
= ATA_MAX_SECTORS
;
1446 ap
->device
[i
].flags
|= ATA_DFLAG_LOCK_SECTORS
;
1449 if (ap
->ops
->dev_config
)
1450 ap
->ops
->dev_config(ap
, &ap
->device
[i
]);
1454 * ata_bus_probe - Reset and probe ATA bus
1457 * Master ATA bus probing function. Initiates a hardware-dependent
1458 * bus reset, then attempts to identify any devices found on
1462 * PCI/etc. bus probe sem.
1465 * Zero on success, non-zero on error.
1468 static int ata_bus_probe(struct ata_port
*ap
)
1470 unsigned int i
, found
= 0;
1472 ap
->ops
->phy_reset(ap
);
1473 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1476 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1477 ata_dev_identify(ap
, i
);
1478 if (ata_dev_present(&ap
->device
[i
])) {
1480 ata_dev_config(ap
,i
);
1484 if ((!found
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1485 goto err_out_disable
;
1488 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1489 goto err_out_disable
;
1494 ap
->ops
->port_disable(ap
);
1500 * ata_port_probe - Mark port as enabled
1501 * @ap: Port for which we indicate enablement
1503 * Modify @ap data structure such that the system
1504 * thinks that the entire port is enabled.
1506 * LOCKING: host_set lock, or some other form of
1510 void ata_port_probe(struct ata_port
*ap
)
1512 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1516 * sata_print_link_status - Print SATA link status
1517 * @ap: SATA port to printk link status about
1519 * This function prints link speed and status of a SATA link.
1524 static void sata_print_link_status(struct ata_port
*ap
)
1529 if (!ap
->ops
->scr_read
)
1532 sstatus
= scr_read(ap
, SCR_STATUS
);
1534 if (sata_dev_present(ap
)) {
1535 tmp
= (sstatus
>> 4) & 0xf;
1538 else if (tmp
& (1 << 1))
1541 speed
= "<unknown>";
1542 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1543 ap
->id
, speed
, sstatus
);
1545 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1551 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1552 * @ap: SATA port associated with target SATA PHY.
1554 * This function issues commands to standard SATA Sxxx
1555 * PHY registers, to wake up the phy (and device), and
1556 * clear any reset condition.
1559 * PCI/etc. bus probe sem.
1562 void __sata_phy_reset(struct ata_port
*ap
)
1565 unsigned long timeout
= jiffies
+ (HZ
* 5);
1567 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1568 /* issue phy wake/reset */
1569 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1570 /* Couldn't find anything in SATA I/II specs, but
1571 * AHCI-1.1 10.4.2 says at least 1 ms. */
1574 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1576 /* wait for phy to become ready, if necessary */
1579 sstatus
= scr_read(ap
, SCR_STATUS
);
1580 if ((sstatus
& 0xf) != 1)
1582 } while (time_before(jiffies
, timeout
));
1584 /* print link status */
1585 sata_print_link_status(ap
);
1587 /* TODO: phy layer with polling, timeouts, etc. */
1588 if (sata_dev_present(ap
))
1591 ata_port_disable(ap
);
1593 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1596 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1597 ata_port_disable(ap
);
1601 ap
->cbl
= ATA_CBL_SATA
;
1605 * sata_phy_reset - Reset SATA bus.
1606 * @ap: SATA port associated with target SATA PHY.
1608 * This function resets the SATA bus, and then probes
1609 * the bus for devices.
1612 * PCI/etc. bus probe sem.
1615 void sata_phy_reset(struct ata_port
*ap
)
1617 __sata_phy_reset(ap
);
1618 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1624 * ata_port_disable - Disable port.
1625 * @ap: Port to be disabled.
1627 * Modify @ap data structure such that the system
1628 * thinks that the entire port is disabled, and should
1629 * never attempt to probe or communicate with devices
1632 * LOCKING: host_set lock, or some other form of
1636 void ata_port_disable(struct ata_port
*ap
)
1638 ap
->device
[0].class = ATA_DEV_NONE
;
1639 ap
->device
[1].class = ATA_DEV_NONE
;
1640 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1644 * This mode timing computation functionality is ported over from
1645 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1648 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1649 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1650 * for PIO 5, which is a nonstandard extension and UDMA6, which
1651 * is currently supported only by Maxtor drives.
1654 static const struct ata_timing ata_timing
[] = {
1656 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1657 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1658 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1659 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1661 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1662 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1663 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1665 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1667 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1668 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1669 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1671 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1672 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1673 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1675 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1676 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1677 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1679 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1680 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1681 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1683 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1688 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1689 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1691 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1693 q
->setup
= EZ(t
->setup
* 1000, T
);
1694 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1695 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1696 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1697 q
->active
= EZ(t
->active
* 1000, T
);
1698 q
->recover
= EZ(t
->recover
* 1000, T
);
1699 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1700 q
->udma
= EZ(t
->udma
* 1000, UT
);
1703 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1704 struct ata_timing
*m
, unsigned int what
)
1706 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1707 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1708 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1709 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1710 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1711 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1712 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1713 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1716 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1718 const struct ata_timing
*t
;
1720 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1721 if (t
->mode
== 0xFF)
1726 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1727 struct ata_timing
*t
, int T
, int UT
)
1729 const struct ata_timing
*s
;
1730 struct ata_timing p
;
1736 if (!(s
= ata_timing_find_mode(speed
)))
1739 memcpy(t
, s
, sizeof(*s
));
1742 * If the drive is an EIDE drive, it can tell us it needs extended
1743 * PIO/MW_DMA cycle timing.
1746 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1747 memset(&p
, 0, sizeof(p
));
1748 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1749 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1750 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1751 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1752 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1754 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1758 * Convert the timing to bus clock counts.
1761 ata_timing_quantize(t
, t
, T
, UT
);
1764 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY, S.M.A.R.T
1765 * and some other commands. We have to ensure that the DMA cycle timing is
1766 * slower/equal than the fastest PIO timing.
1769 if (speed
> XFER_PIO_4
) {
1770 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1771 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1775 * Lenghten active & recovery time so that cycle time is correct.
1778 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1779 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1780 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1783 if (t
->active
+ t
->recover
< t
->cycle
) {
1784 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1785 t
->recover
= t
->cycle
- t
->active
;
1791 static const struct {
1794 } xfer_mode_classes
[] = {
1795 { ATA_SHIFT_UDMA
, XFER_UDMA_0
},
1796 { ATA_SHIFT_MWDMA
, XFER_MW_DMA_0
},
1797 { ATA_SHIFT_PIO
, XFER_PIO_0
},
1800 static u8
base_from_shift(unsigned int shift
)
1804 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++)
1805 if (xfer_mode_classes
[i
].shift
== shift
)
1806 return xfer_mode_classes
[i
].base
;
1811 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1816 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1819 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1820 dev
->flags
|= ATA_DFLAG_PIO
;
1822 ata_dev_set_xfermode(ap
, dev
);
1824 base
= base_from_shift(dev
->xfer_shift
);
1825 ofs
= dev
->xfer_mode
- base
;
1826 idx
= ofs
+ dev
->xfer_shift
;
1827 WARN_ON(idx
>= ARRAY_SIZE(xfer_mode_str
));
1829 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1830 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1832 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1833 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1836 static int ata_host_set_pio(struct ata_port
*ap
)
1842 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1845 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1849 base
= base_from_shift(ATA_SHIFT_PIO
);
1850 xfer_mode
= base
+ x
;
1852 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1853 (int)base
, (int)xfer_mode
, mask
, x
);
1855 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1856 struct ata_device
*dev
= &ap
->device
[i
];
1857 if (ata_dev_present(dev
)) {
1858 dev
->pio_mode
= xfer_mode
;
1859 dev
->xfer_mode
= xfer_mode
;
1860 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1861 if (ap
->ops
->set_piomode
)
1862 ap
->ops
->set_piomode(ap
, dev
);
1869 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1870 unsigned int xfer_shift
)
1874 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1875 struct ata_device
*dev
= &ap
->device
[i
];
1876 if (ata_dev_present(dev
)) {
1877 dev
->dma_mode
= xfer_mode
;
1878 dev
->xfer_mode
= xfer_mode
;
1879 dev
->xfer_shift
= xfer_shift
;
1880 if (ap
->ops
->set_dmamode
)
1881 ap
->ops
->set_dmamode(ap
, dev
);
1887 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1888 * @ap: port on which timings will be programmed
1890 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1893 * PCI/etc. bus probe sem.
1896 static void ata_set_mode(struct ata_port
*ap
)
1898 unsigned int xfer_shift
;
1902 /* step 1: always set host PIO timings */
1903 rc
= ata_host_set_pio(ap
);
1907 /* step 2: choose the best data xfer mode */
1908 xfer_mode
= xfer_shift
= 0;
1909 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1913 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1914 if (xfer_shift
!= ATA_SHIFT_PIO
)
1915 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1917 /* step 4: update devices' xfer mode */
1918 ata_dev_set_mode(ap
, &ap
->device
[0]);
1919 ata_dev_set_mode(ap
, &ap
->device
[1]);
1921 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1924 if (ap
->ops
->post_set_mode
)
1925 ap
->ops
->post_set_mode(ap
);
1930 ata_port_disable(ap
);
1934 * ata_busy_sleep - sleep until BSY clears, or timeout
1935 * @ap: port containing status register to be polled
1936 * @tmout_pat: impatience timeout
1937 * @tmout: overall timeout
1939 * Sleep until ATA Status register bit BSY clears,
1940 * or a timeout occurs.
1946 static unsigned int ata_busy_sleep (struct ata_port
*ap
,
1947 unsigned long tmout_pat
,
1948 unsigned long tmout
)
1950 unsigned long timer_start
, timeout
;
1953 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1954 timer_start
= jiffies
;
1955 timeout
= timer_start
+ tmout_pat
;
1956 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1958 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1961 if (status
& ATA_BUSY
)
1962 printk(KERN_WARNING
"ata%u is slow to respond, "
1963 "please be patient\n", ap
->id
);
1965 timeout
= timer_start
+ tmout
;
1966 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1968 status
= ata_chk_status(ap
);
1971 if (status
& ATA_BUSY
) {
1972 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1973 ap
->id
, tmout
/ HZ
);
1980 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1982 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1983 unsigned int dev0
= devmask
& (1 << 0);
1984 unsigned int dev1
= devmask
& (1 << 1);
1985 unsigned long timeout
;
1987 /* if device 0 was found in ata_devchk, wait for its
1991 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1993 /* if device 1 was found in ata_devchk, wait for
1994 * register access, then wait for BSY to clear
1996 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2000 ap
->ops
->dev_select(ap
, 1);
2001 if (ap
->flags
& ATA_FLAG_MMIO
) {
2002 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2003 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2005 nsect
= inb(ioaddr
->nsect_addr
);
2006 lbal
= inb(ioaddr
->lbal_addr
);
2008 if ((nsect
== 1) && (lbal
== 1))
2010 if (time_after(jiffies
, timeout
)) {
2014 msleep(50); /* give drive a breather */
2017 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2019 /* is all this really necessary? */
2020 ap
->ops
->dev_select(ap
, 0);
2022 ap
->ops
->dev_select(ap
, 1);
2024 ap
->ops
->dev_select(ap
, 0);
2028 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
2029 * @ap: Port to reset and probe
2031 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
2032 * probe the bus. Not often used these days.
2035 * PCI/etc. bus probe sem.
2036 * Obtains host_set lock.
2040 static unsigned int ata_bus_edd(struct ata_port
*ap
)
2042 struct ata_taskfile tf
;
2043 unsigned long flags
;
2045 /* set up execute-device-diag (bus reset) taskfile */
2046 /* also, take interrupts to a known state (disabled) */
2047 DPRINTK("execute-device-diag\n");
2048 ata_tf_init(ap
, &tf
, 0);
2050 tf
.command
= ATA_CMD_EDD
;
2051 tf
.protocol
= ATA_PROT_NODATA
;
2054 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2055 ata_tf_to_host(ap
, &tf
);
2056 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2058 /* spec says at least 2ms. but who knows with those
2059 * crazy ATAPI devices...
2063 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2066 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2067 unsigned int devmask
)
2069 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2071 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2073 /* software reset. causes dev0 to be selected */
2074 if (ap
->flags
& ATA_FLAG_MMIO
) {
2075 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2076 udelay(20); /* FIXME: flush */
2077 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2078 udelay(20); /* FIXME: flush */
2079 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2081 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2083 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2085 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2088 /* spec mandates ">= 2ms" before checking status.
2089 * We wait 150ms, because that was the magic delay used for
2090 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2091 * between when the ATA command register is written, and then
2092 * status is checked. Because waiting for "a while" before
2093 * checking status is fine, post SRST, we perform this magic
2094 * delay here as well.
2098 ata_bus_post_reset(ap
, devmask
);
2104 * ata_bus_reset - reset host port and associated ATA channel
2105 * @ap: port to reset
2107 * This is typically the first time we actually start issuing
2108 * commands to the ATA channel. We wait for BSY to clear, then
2109 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2110 * result. Determine what devices, if any, are on the channel
2111 * by looking at the device 0/1 error register. Look at the signature
2112 * stored in each device's taskfile registers, to determine if
2113 * the device is ATA or ATAPI.
2116 * PCI/etc. bus probe sem.
2117 * Obtains host_set lock.
2120 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2123 void ata_bus_reset(struct ata_port
*ap
)
2125 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2126 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2128 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
2130 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2132 /* determine if device 0/1 are present */
2133 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2136 dev0
= ata_devchk(ap
, 0);
2138 dev1
= ata_devchk(ap
, 1);
2142 devmask
|= (1 << 0);
2144 devmask
|= (1 << 1);
2146 /* select device 0 again */
2147 ap
->ops
->dev_select(ap
, 0);
2149 /* issue bus reset */
2150 if (ap
->flags
& ATA_FLAG_SRST
)
2151 rc
= ata_bus_softreset(ap
, devmask
);
2152 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
2153 /* set up device control */
2154 if (ap
->flags
& ATA_FLAG_MMIO
)
2155 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2157 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2158 rc
= ata_bus_edd(ap
);
2165 * determine by signature whether we have ATA or ATAPI devices
2167 err
= ata_dev_try_classify(ap
, 0);
2168 if ((slave_possible
) && (err
!= 0x81))
2169 ata_dev_try_classify(ap
, 1);
2171 /* re-enable interrupts */
2172 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2175 /* is double-select really necessary? */
2176 if (ap
->device
[1].class != ATA_DEV_NONE
)
2177 ap
->ops
->dev_select(ap
, 1);
2178 if (ap
->device
[0].class != ATA_DEV_NONE
)
2179 ap
->ops
->dev_select(ap
, 0);
2181 /* if no devices were detected, disable this port */
2182 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2183 (ap
->device
[1].class == ATA_DEV_NONE
))
2186 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2187 /* set up device control for ATA_FLAG_SATA_RESET */
2188 if (ap
->flags
& ATA_FLAG_MMIO
)
2189 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2191 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2198 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2199 ap
->ops
->port_disable(ap
);
2204 static void ata_pr_blacklisted(const struct ata_port
*ap
,
2205 const struct ata_device
*dev
)
2207 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2208 ap
->id
, dev
->devno
);
2211 static const char * const ata_dma_blacklist
[] = {
2230 "Toshiba CD-ROM XM-6202B",
2231 "TOSHIBA CD-ROM XM-1702BC",
2233 "E-IDE CD-ROM CR-840",
2236 "SAMSUNG CD-ROM SC-148C",
2237 "SAMSUNG CD-ROM SC",
2239 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2243 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2245 unsigned char model_num
[40];
2250 ata_dev_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2253 len
= strnlen(s
, sizeof(model_num
));
2255 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2256 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2261 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2262 if (!strncmp(ata_dma_blacklist
[i
], s
, len
))
2268 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
)
2270 const struct ata_device
*master
, *slave
;
2273 master
= &ap
->device
[0];
2274 slave
= &ap
->device
[1];
2276 assert (ata_dev_present(master
) || ata_dev_present(slave
));
2278 if (shift
== ATA_SHIFT_UDMA
) {
2279 mask
= ap
->udma_mask
;
2280 if (ata_dev_present(master
)) {
2281 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2282 if (ata_dma_blacklisted(master
)) {
2284 ata_pr_blacklisted(ap
, master
);
2287 if (ata_dev_present(slave
)) {
2288 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2289 if (ata_dma_blacklisted(slave
)) {
2291 ata_pr_blacklisted(ap
, slave
);
2295 else if (shift
== ATA_SHIFT_MWDMA
) {
2296 mask
= ap
->mwdma_mask
;
2297 if (ata_dev_present(master
)) {
2298 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2299 if (ata_dma_blacklisted(master
)) {
2301 ata_pr_blacklisted(ap
, master
);
2304 if (ata_dev_present(slave
)) {
2305 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2306 if (ata_dma_blacklisted(slave
)) {
2308 ata_pr_blacklisted(ap
, slave
);
2312 else if (shift
== ATA_SHIFT_PIO
) {
2313 mask
= ap
->pio_mask
;
2314 if (ata_dev_present(master
)) {
2315 /* spec doesn't return explicit support for
2316 * PIO0-2, so we fake it
2318 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2323 if (ata_dev_present(slave
)) {
2324 /* spec doesn't return explicit support for
2325 * PIO0-2, so we fake it
2327 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2334 mask
= 0xffffffff; /* shut up compiler warning */
2341 /* find greatest bit */
2342 static int fgb(u32 bitmap
)
2347 for (i
= 0; i
< 32; i
++)
2348 if (bitmap
& (1 << i
))
2355 * ata_choose_xfer_mode - attempt to find best transfer mode
2356 * @ap: Port for which an xfer mode will be selected
2357 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2358 * @xfer_shift_out: (output) bit shift that selects this mode
2360 * Based on host and device capabilities, determine the
2361 * maximum transfer mode that is amenable to all.
2364 * PCI/etc. bus probe sem.
2367 * Zero on success, negative on error.
2370 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
2372 unsigned int *xfer_shift_out
)
2374 unsigned int mask
, shift
;
2377 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2378 shift
= xfer_mode_classes
[i
].shift
;
2379 mask
= ata_get_mode_mask(ap
, shift
);
2383 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2384 *xfer_shift_out
= shift
;
2393 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2394 * @ap: Port associated with device @dev
2395 * @dev: Device to which command will be sent
2397 * Issue SET FEATURES - XFER MODE command to device @dev
2401 * PCI/etc. bus probe sem.
2404 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2406 struct ata_taskfile tf
;
2408 /* set up set-features taskfile */
2409 DPRINTK("set features - xfer mode\n");
2411 ata_tf_init(ap
, &tf
, dev
->devno
);
2412 tf
.command
= ATA_CMD_SET_FEATURES
;
2413 tf
.feature
= SETFEATURES_XFER
;
2414 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2415 tf
.protocol
= ATA_PROT_NODATA
;
2416 tf
.nsect
= dev
->xfer_mode
;
2418 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2419 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2421 ata_port_disable(ap
);
2428 * ata_dev_reread_id - Reread the device identify device info
2429 * @ap: port where the device is
2430 * @dev: device to reread the identify device info
2435 static void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
)
2437 struct ata_taskfile tf
;
2439 ata_tf_init(ap
, &tf
, dev
->devno
);
2441 if (dev
->class == ATA_DEV_ATA
) {
2442 tf
.command
= ATA_CMD_ID_ATA
;
2443 DPRINTK("do ATA identify\n");
2445 tf
.command
= ATA_CMD_ID_ATAPI
;
2446 DPRINTK("do ATAPI identify\n");
2449 tf
.flags
|= ATA_TFLAG_DEVICE
;
2450 tf
.protocol
= ATA_PROT_PIO
;
2452 if (ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
2453 dev
->id
, sizeof(dev
->id
)))
2456 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
2464 printk(KERN_ERR
"ata%u: failed to reread ID, disabled\n", ap
->id
);
2465 ata_port_disable(ap
);
2469 * ata_dev_init_params - Issue INIT DEV PARAMS command
2470 * @ap: Port associated with device @dev
2471 * @dev: Device to which command will be sent
2476 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
)
2478 struct ata_taskfile tf
;
2479 u16 sectors
= dev
->id
[6];
2480 u16 heads
= dev
->id
[3];
2482 /* Number of sectors per track 1-255. Number of heads 1-16 */
2483 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2486 /* set up init dev params taskfile */
2487 DPRINTK("init dev params \n");
2489 ata_tf_init(ap
, &tf
, dev
->devno
);
2490 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2491 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2492 tf
.protocol
= ATA_PROT_NODATA
;
2494 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2496 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2497 printk(KERN_ERR
"ata%u: failed to init parameters, disabled\n",
2499 ata_port_disable(ap
);
2506 * ata_sg_clean - Unmap DMA memory associated with command
2507 * @qc: Command containing DMA memory to be released
2509 * Unmap all mapped DMA memory associated with this command.
2512 * spin_lock_irqsave(host_set lock)
2515 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2517 struct ata_port
*ap
= qc
->ap
;
2518 struct scatterlist
*sg
= qc
->__sg
;
2519 int dir
= qc
->dma_dir
;
2520 void *pad_buf
= NULL
;
2522 assert(qc
->flags
& ATA_QCFLAG_DMAMAP
);
2525 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2526 assert(qc
->n_elem
== 1);
2528 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2530 /* if we padded the buffer out to 32-bit bound, and data
2531 * xfer direction is from-device, we must copy from the
2532 * pad buffer back into the supplied buffer
2534 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2535 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2537 if (qc
->flags
& ATA_QCFLAG_SG
) {
2539 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2540 /* restore last sg */
2541 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2543 struct scatterlist
*psg
= &qc
->pad_sgent
;
2544 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2545 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2546 kunmap_atomic(addr
, KM_IRQ0
);
2549 if (sg_dma_len(&sg
[0]) > 0)
2550 dma_unmap_single(ap
->host_set
->dev
,
2551 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2554 sg
->length
+= qc
->pad_len
;
2556 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2557 pad_buf
, qc
->pad_len
);
2560 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2565 * ata_fill_sg - Fill PCI IDE PRD table
2566 * @qc: Metadata associated with taskfile to be transferred
2568 * Fill PCI IDE PRD (scatter-gather) table with segments
2569 * associated with the current disk command.
2572 * spin_lock_irqsave(host_set lock)
2575 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2577 struct ata_port
*ap
= qc
->ap
;
2578 struct scatterlist
*sg
;
2581 assert(qc
->__sg
!= NULL
);
2582 assert(qc
->n_elem
> 0);
2585 ata_for_each_sg(sg
, qc
) {
2589 /* determine if physical DMA addr spans 64K boundary.
2590 * Note h/w doesn't support 64-bit, so we unconditionally
2591 * truncate dma_addr_t to u32.
2593 addr
= (u32
) sg_dma_address(sg
);
2594 sg_len
= sg_dma_len(sg
);
2597 offset
= addr
& 0xffff;
2599 if ((offset
+ sg_len
) > 0x10000)
2600 len
= 0x10000 - offset
;
2602 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2603 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2604 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2613 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2616 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2617 * @qc: Metadata associated with taskfile to check
2619 * Allow low-level driver to filter ATA PACKET commands, returning
2620 * a status indicating whether or not it is OK to use DMA for the
2621 * supplied PACKET command.
2624 * spin_lock_irqsave(host_set lock)
2626 * RETURNS: 0 when ATAPI DMA can be used
2629 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2631 struct ata_port
*ap
= qc
->ap
;
2632 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2634 if (ap
->ops
->check_atapi_dma
)
2635 rc
= ap
->ops
->check_atapi_dma(qc
);
2640 * ata_qc_prep - Prepare taskfile for submission
2641 * @qc: Metadata associated with taskfile to be prepared
2643 * Prepare ATA taskfile for submission.
2646 * spin_lock_irqsave(host_set lock)
2648 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2650 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2657 * ata_sg_init_one - Associate command with memory buffer
2658 * @qc: Command to be associated
2659 * @buf: Memory buffer
2660 * @buflen: Length of memory buffer, in bytes.
2662 * Initialize the data-related elements of queued_cmd @qc
2663 * to point to a single memory buffer, @buf of byte length @buflen.
2666 * spin_lock_irqsave(host_set lock)
2669 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2671 struct scatterlist
*sg
;
2673 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2675 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2676 qc
->__sg
= &qc
->sgent
;
2678 qc
->orig_n_elem
= 1;
2682 sg_init_one(sg
, buf
, buflen
);
2686 * ata_sg_init - Associate command with scatter-gather table.
2687 * @qc: Command to be associated
2688 * @sg: Scatter-gather table.
2689 * @n_elem: Number of elements in s/g table.
2691 * Initialize the data-related elements of queued_cmd @qc
2692 * to point to a scatter-gather table @sg, containing @n_elem
2696 * spin_lock_irqsave(host_set lock)
2699 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2700 unsigned int n_elem
)
2702 qc
->flags
|= ATA_QCFLAG_SG
;
2704 qc
->n_elem
= n_elem
;
2705 qc
->orig_n_elem
= n_elem
;
2709 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2710 * @qc: Command with memory buffer to be mapped.
2712 * DMA-map the memory buffer associated with queued_cmd @qc.
2715 * spin_lock_irqsave(host_set lock)
2718 * Zero on success, negative on error.
2721 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2723 struct ata_port
*ap
= qc
->ap
;
2724 int dir
= qc
->dma_dir
;
2725 struct scatterlist
*sg
= qc
->__sg
;
2726 dma_addr_t dma_address
;
2728 /* we must lengthen transfers to end on a 32-bit boundary */
2729 qc
->pad_len
= sg
->length
& 3;
2731 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2732 struct scatterlist
*psg
= &qc
->pad_sgent
;
2734 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
2736 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2738 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2739 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2742 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2743 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2745 sg
->length
-= qc
->pad_len
;
2747 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2748 sg
->length
, qc
->pad_len
);
2752 sg_dma_address(sg
) = 0;
2756 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2758 if (dma_mapping_error(dma_address
)) {
2760 sg
->length
+= qc
->pad_len
;
2764 sg_dma_address(sg
) = dma_address
;
2766 sg_dma_len(sg
) = sg
->length
;
2768 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2769 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2775 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2776 * @qc: Command with scatter-gather table to be mapped.
2778 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2781 * spin_lock_irqsave(host_set lock)
2784 * Zero on success, negative on error.
2788 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
2790 struct ata_port
*ap
= qc
->ap
;
2791 struct scatterlist
*sg
= qc
->__sg
;
2792 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
2793 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
2795 VPRINTK("ENTER, ata%u\n", ap
->id
);
2796 assert(qc
->flags
& ATA_QCFLAG_SG
);
2798 /* we must lengthen transfers to end on a 32-bit boundary */
2799 qc
->pad_len
= lsg
->length
& 3;
2801 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2802 struct scatterlist
*psg
= &qc
->pad_sgent
;
2803 unsigned int offset
;
2805 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
2807 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2810 * psg->page/offset are used to copy to-be-written
2811 * data in this function or read data in ata_sg_clean.
2813 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
2814 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
2815 psg
->offset
= offset_in_page(offset
);
2817 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
2818 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2819 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
2820 kunmap_atomic(addr
, KM_IRQ0
);
2823 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2824 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2826 lsg
->length
-= qc
->pad_len
;
2827 if (lsg
->length
== 0)
2830 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2831 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
2834 pre_n_elem
= qc
->n_elem
;
2835 if (trim_sg
&& pre_n_elem
)
2844 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
2846 /* restore last sg */
2847 lsg
->length
+= qc
->pad_len
;
2851 DPRINTK("%d sg elements mapped\n", n_elem
);
2854 qc
->n_elem
= n_elem
;
2860 * ata_poll_qc_complete - turn irq back on and finish qc
2861 * @qc: Command to complete
2862 * @err_mask: ATA status register content
2865 * None. (grabs host lock)
2868 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
2870 struct ata_port
*ap
= qc
->ap
;
2871 unsigned long flags
;
2873 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2874 ap
->flags
&= ~ATA_FLAG_NOINTR
;
2876 ata_qc_complete(qc
);
2877 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2882 * @ap: the target ata_port
2885 * None. (executing in kernel thread context)
2888 * timeout value to use
2891 static unsigned long ata_pio_poll(struct ata_port
*ap
)
2893 struct ata_queued_cmd
*qc
;
2895 unsigned int poll_state
= HSM_ST_UNKNOWN
;
2896 unsigned int reg_state
= HSM_ST_UNKNOWN
;
2898 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2901 switch (ap
->hsm_task_state
) {
2904 poll_state
= HSM_ST_POLL
;
2908 case HSM_ST_LAST_POLL
:
2909 poll_state
= HSM_ST_LAST_POLL
;
2910 reg_state
= HSM_ST_LAST
;
2917 status
= ata_chk_status(ap
);
2918 if (status
& ATA_BUSY
) {
2919 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
2920 qc
->err_mask
|= AC_ERR_TIMEOUT
;
2921 ap
->hsm_task_state
= HSM_ST_TMOUT
;
2924 ap
->hsm_task_state
= poll_state
;
2925 return ATA_SHORT_PAUSE
;
2928 ap
->hsm_task_state
= reg_state
;
2933 * ata_pio_complete - check if drive is busy or idle
2934 * @ap: the target ata_port
2937 * None. (executing in kernel thread context)
2940 * Non-zero if qc completed, zero otherwise.
2943 static int ata_pio_complete (struct ata_port
*ap
)
2945 struct ata_queued_cmd
*qc
;
2949 * This is purely heuristic. This is a fast path. Sometimes when
2950 * we enter, BSY will be cleared in a chk-status or two. If not,
2951 * the drive is probably seeking or something. Snooze for a couple
2952 * msecs, then chk-status again. If still busy, fall back to
2953 * HSM_ST_POLL state.
2955 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
2956 if (drv_stat
& ATA_BUSY
) {
2958 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
2959 if (drv_stat
& ATA_BUSY
) {
2960 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
2961 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
2966 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2969 drv_stat
= ata_wait_idle(ap
);
2970 if (!ata_ok(drv_stat
)) {
2971 qc
->err_mask
|= __ac_err_mask(drv_stat
);
2972 ap
->hsm_task_state
= HSM_ST_ERR
;
2976 ap
->hsm_task_state
= HSM_ST_IDLE
;
2978 assert(qc
->err_mask
== 0);
2979 ata_poll_qc_complete(qc
);
2981 /* another command may start at this point */
2988 * swap_buf_le16 - swap halves of 16-words in place
2989 * @buf: Buffer to swap
2990 * @buf_words: Number of 16-bit words in buffer.
2992 * Swap halves of 16-bit words if needed to convert from
2993 * little-endian byte order to native cpu byte order, or
2997 * Inherited from caller.
2999 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3004 for (i
= 0; i
< buf_words
; i
++)
3005 buf
[i
] = le16_to_cpu(buf
[i
]);
3006 #endif /* __BIG_ENDIAN */
3010 * ata_mmio_data_xfer - Transfer data by MMIO
3011 * @ap: port to read/write
3013 * @buflen: buffer length
3014 * @write_data: read/write
3016 * Transfer data from/to the device data register by MMIO.
3019 * Inherited from caller.
3022 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3023 unsigned int buflen
, int write_data
)
3026 unsigned int words
= buflen
>> 1;
3027 u16
*buf16
= (u16
*) buf
;
3028 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3030 /* Transfer multiple of 2 bytes */
3032 for (i
= 0; i
< words
; i
++)
3033 writew(le16_to_cpu(buf16
[i
]), mmio
);
3035 for (i
= 0; i
< words
; i
++)
3036 buf16
[i
] = cpu_to_le16(readw(mmio
));
3039 /* Transfer trailing 1 byte, if any. */
3040 if (unlikely(buflen
& 0x01)) {
3041 u16 align_buf
[1] = { 0 };
3042 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3045 memcpy(align_buf
, trailing_buf
, 1);
3046 writew(le16_to_cpu(align_buf
[0]), mmio
);
3048 align_buf
[0] = cpu_to_le16(readw(mmio
));
3049 memcpy(trailing_buf
, align_buf
, 1);
3055 * ata_pio_data_xfer - Transfer data by PIO
3056 * @ap: port to read/write
3058 * @buflen: buffer length
3059 * @write_data: read/write
3061 * Transfer data from/to the device data register by PIO.
3064 * Inherited from caller.
3067 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3068 unsigned int buflen
, int write_data
)
3070 unsigned int words
= buflen
>> 1;
3072 /* Transfer multiple of 2 bytes */
3074 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3076 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3078 /* Transfer trailing 1 byte, if any. */
3079 if (unlikely(buflen
& 0x01)) {
3080 u16 align_buf
[1] = { 0 };
3081 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3084 memcpy(align_buf
, trailing_buf
, 1);
3085 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3087 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3088 memcpy(trailing_buf
, align_buf
, 1);
3094 * ata_data_xfer - Transfer data from/to the data register.
3095 * @ap: port to read/write
3097 * @buflen: buffer length
3098 * @do_write: read/write
3100 * Transfer data from/to the device data register.
3103 * Inherited from caller.
3106 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3107 unsigned int buflen
, int do_write
)
3109 /* Make the crap hardware pay the costs not the good stuff */
3110 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3111 unsigned long flags
;
3112 local_irq_save(flags
);
3113 if (ap
->flags
& ATA_FLAG_MMIO
)
3114 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3116 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3117 local_irq_restore(flags
);
3119 if (ap
->flags
& ATA_FLAG_MMIO
)
3120 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3122 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3127 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3128 * @qc: Command on going
3130 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3133 * Inherited from caller.
3136 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3138 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3139 struct scatterlist
*sg
= qc
->__sg
;
3140 struct ata_port
*ap
= qc
->ap
;
3142 unsigned int offset
;
3145 if (qc
->cursect
== (qc
->nsect
- 1))
3146 ap
->hsm_task_state
= HSM_ST_LAST
;
3148 page
= sg
[qc
->cursg
].page
;
3149 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3151 /* get the current page and offset */
3152 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3153 offset
%= PAGE_SIZE
;
3155 buf
= kmap(page
) + offset
;
3160 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3165 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3167 /* do the actual data transfer */
3168 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3169 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3175 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3176 * @qc: Command on going
3177 * @bytes: number of bytes
3179 * Transfer Transfer data from/to the ATAPI device.
3182 * Inherited from caller.
3186 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3188 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3189 struct scatterlist
*sg
= qc
->__sg
;
3190 struct ata_port
*ap
= qc
->ap
;
3193 unsigned int offset
, count
;
3195 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3196 ap
->hsm_task_state
= HSM_ST_LAST
;
3199 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3201 * The end of qc->sg is reached and the device expects
3202 * more data to transfer. In order not to overrun qc->sg
3203 * and fulfill length specified in the byte count register,
3204 * - for read case, discard trailing data from the device
3205 * - for write case, padding zero data to the device
3207 u16 pad_buf
[1] = { 0 };
3208 unsigned int words
= bytes
>> 1;
3211 if (words
) /* warning if bytes > 1 */
3212 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3215 for (i
= 0; i
< words
; i
++)
3216 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3218 ap
->hsm_task_state
= HSM_ST_LAST
;
3222 sg
= &qc
->__sg
[qc
->cursg
];
3225 offset
= sg
->offset
+ qc
->cursg_ofs
;
3227 /* get the current page and offset */
3228 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3229 offset
%= PAGE_SIZE
;
3231 /* don't overrun current sg */
3232 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3234 /* don't cross page boundaries */
3235 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3237 buf
= kmap(page
) + offset
;
3240 qc
->curbytes
+= count
;
3241 qc
->cursg_ofs
+= count
;
3243 if (qc
->cursg_ofs
== sg
->length
) {
3248 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3250 /* do the actual data transfer */
3251 ata_data_xfer(ap
, buf
, count
, do_write
);
3260 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3261 * @qc: Command on going
3263 * Transfer Transfer data from/to the ATAPI device.
3266 * Inherited from caller.
3269 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3271 struct ata_port
*ap
= qc
->ap
;
3272 struct ata_device
*dev
= qc
->dev
;
3273 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3274 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3276 ap
->ops
->tf_read(ap
, &qc
->tf
);
3277 ireason
= qc
->tf
.nsect
;
3278 bc_lo
= qc
->tf
.lbam
;
3279 bc_hi
= qc
->tf
.lbah
;
3280 bytes
= (bc_hi
<< 8) | bc_lo
;
3282 /* shall be cleared to zero, indicating xfer of data */
3283 if (ireason
& (1 << 0))
3286 /* make sure transfer direction matches expected */
3287 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3288 if (do_write
!= i_write
)
3291 __atapi_pio_bytes(qc
, bytes
);
3296 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3297 ap
->id
, dev
->devno
);
3298 qc
->err_mask
|= AC_ERR_HSM
;
3299 ap
->hsm_task_state
= HSM_ST_ERR
;
3303 * ata_pio_block - start PIO on a block
3304 * @ap: the target ata_port
3307 * None. (executing in kernel thread context)
3310 static void ata_pio_block(struct ata_port
*ap
)
3312 struct ata_queued_cmd
*qc
;
3316 * This is purely heuristic. This is a fast path.
3317 * Sometimes when we enter, BSY will be cleared in
3318 * a chk-status or two. If not, the drive is probably seeking
3319 * or something. Snooze for a couple msecs, then
3320 * chk-status again. If still busy, fall back to
3321 * HSM_ST_POLL state.
3323 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3324 if (status
& ATA_BUSY
) {
3326 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3327 if (status
& ATA_BUSY
) {
3328 ap
->hsm_task_state
= HSM_ST_POLL
;
3329 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3334 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3338 if (status
& (ATA_ERR
| ATA_DF
)) {
3339 qc
->err_mask
|= AC_ERR_DEV
;
3340 ap
->hsm_task_state
= HSM_ST_ERR
;
3344 /* transfer data if any */
3345 if (is_atapi_taskfile(&qc
->tf
)) {
3346 /* DRQ=0 means no more data to transfer */
3347 if ((status
& ATA_DRQ
) == 0) {
3348 ap
->hsm_task_state
= HSM_ST_LAST
;
3352 atapi_pio_bytes(qc
);
3354 /* handle BSY=0, DRQ=0 as error */
3355 if ((status
& ATA_DRQ
) == 0) {
3356 qc
->err_mask
|= AC_ERR_HSM
;
3357 ap
->hsm_task_state
= HSM_ST_ERR
;
3365 static void ata_pio_error(struct ata_port
*ap
)
3367 struct ata_queued_cmd
*qc
;
3369 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3371 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3374 /* make sure qc->err_mask is available to
3375 * know what's wrong and recover
3377 assert(qc
->err_mask
);
3379 ap
->hsm_task_state
= HSM_ST_IDLE
;
3381 ata_poll_qc_complete(qc
);
3384 static void ata_pio_task(void *_data
)
3386 struct ata_port
*ap
= _data
;
3387 unsigned long timeout
;
3394 switch (ap
->hsm_task_state
) {
3403 qc_completed
= ata_pio_complete(ap
);
3407 case HSM_ST_LAST_POLL
:
3408 timeout
= ata_pio_poll(ap
);
3418 queue_delayed_work(ata_wq
, &ap
->pio_task
, timeout
);
3419 else if (!qc_completed
)
3424 * ata_qc_timeout - Handle timeout of queued command
3425 * @qc: Command that timed out
3427 * Some part of the kernel (currently, only the SCSI layer)
3428 * has noticed that the active command on port @ap has not
3429 * completed after a specified length of time. Handle this
3430 * condition by disabling DMA (if necessary) and completing
3431 * transactions, with error if necessary.
3433 * This also handles the case of the "lost interrupt", where
3434 * for some reason (possibly hardware bug, possibly driver bug)
3435 * an interrupt was not delivered to the driver, even though the
3436 * transaction completed successfully.
3439 * Inherited from SCSI layer (none, can sleep)
3442 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3444 struct ata_port
*ap
= qc
->ap
;
3445 struct ata_host_set
*host_set
= ap
->host_set
;
3446 u8 host_stat
= 0, drv_stat
;
3447 unsigned long flags
;
3451 spin_lock_irqsave(&host_set
->lock
, flags
);
3453 /* hack alert! We cannot use the supplied completion
3454 * function from inside the ->eh_strategy_handler() thread.
3455 * libata is the only user of ->eh_strategy_handler() in
3456 * any kernel, so the default scsi_done() assumes it is
3457 * not being called from the SCSI EH.
3459 qc
->scsidone
= scsi_finish_command
;
3461 switch (qc
->tf
.protocol
) {
3464 case ATA_PROT_ATAPI_DMA
:
3465 host_stat
= ap
->ops
->bmdma_status(ap
);
3467 /* before we do anything else, clear DMA-Start bit */
3468 ap
->ops
->bmdma_stop(qc
);
3474 drv_stat
= ata_chk_status(ap
);
3476 /* ack bmdma irq events */
3477 ap
->ops
->irq_clear(ap
);
3479 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3480 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3482 /* complete taskfile transaction */
3483 qc
->err_mask
|= ac_err_mask(drv_stat
);
3484 ata_qc_complete(qc
);
3488 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3494 * ata_eng_timeout - Handle timeout of queued command
3495 * @ap: Port on which timed-out command is active
3497 * Some part of the kernel (currently, only the SCSI layer)
3498 * has noticed that the active command on port @ap has not
3499 * completed after a specified length of time. Handle this
3500 * condition by disabling DMA (if necessary) and completing
3501 * transactions, with error if necessary.
3503 * This also handles the case of the "lost interrupt", where
3504 * for some reason (possibly hardware bug, possibly driver bug)
3505 * an interrupt was not delivered to the driver, even though the
3506 * transaction completed successfully.
3509 * Inherited from SCSI layer (none, can sleep)
3512 void ata_eng_timeout(struct ata_port
*ap
)
3514 struct ata_queued_cmd
*qc
;
3518 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3522 printk(KERN_ERR
"ata%u: BUG: timeout without command\n",
3532 * ata_qc_new - Request an available ATA command, for queueing
3533 * @ap: Port associated with device @dev
3534 * @dev: Device from whom we request an available command structure
3540 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3542 struct ata_queued_cmd
*qc
= NULL
;
3545 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3546 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3547 qc
= ata_qc_from_tag(ap
, i
);
3558 * ata_qc_new_init - Request an available ATA command, and initialize it
3559 * @ap: Port associated with device @dev
3560 * @dev: Device from whom we request an available command structure
3566 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3567 struct ata_device
*dev
)
3569 struct ata_queued_cmd
*qc
;
3571 qc
= ata_qc_new(ap
);
3584 * ata_qc_free - free unused ata_queued_cmd
3585 * @qc: Command to complete
3587 * Designed to free unused ata_queued_cmd object
3588 * in case something prevents using it.
3591 * spin_lock_irqsave(host_set lock)
3593 void ata_qc_free(struct ata_queued_cmd
*qc
)
3595 struct ata_port
*ap
= qc
->ap
;
3598 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3602 if (likely(ata_tag_valid(tag
))) {
3603 if (tag
== ap
->active_tag
)
3604 ap
->active_tag
= ATA_TAG_POISON
;
3605 qc
->tag
= ATA_TAG_POISON
;
3606 clear_bit(tag
, &ap
->qactive
);
3611 * ata_qc_complete - Complete an active ATA command
3612 * @qc: Command to complete
3613 * @err_mask: ATA Status register contents
3615 * Indicate to the mid and upper layers that an ATA
3616 * command has completed, with either an ok or not-ok status.
3619 * spin_lock_irqsave(host_set lock)
3622 void ata_qc_complete(struct ata_queued_cmd
*qc
)
3624 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3625 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
3627 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3630 /* atapi: mark qc as inactive to prevent the interrupt handler
3631 * from completing the command twice later, before the error handler
3632 * is called. (when rc != 0 and atapi request sense is needed)
3634 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3636 /* call completion callback */
3637 qc
->complete_fn(qc
);
3640 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3642 struct ata_port
*ap
= qc
->ap
;
3644 switch (qc
->tf
.protocol
) {
3646 case ATA_PROT_ATAPI_DMA
:
3649 case ATA_PROT_ATAPI
:
3651 case ATA_PROT_PIO_MULT
:
3652 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3665 * ata_qc_issue - issue taskfile to device
3666 * @qc: command to issue to device
3668 * Prepare an ATA command to submission to device.
3669 * This includes mapping the data into a DMA-able
3670 * area, filling in the S/G table, and finally
3671 * writing the taskfile to hardware, starting the command.
3674 * spin_lock_irqsave(host_set lock)
3677 * Zero on success, negative on error.
3680 int ata_qc_issue(struct ata_queued_cmd
*qc
)
3682 struct ata_port
*ap
= qc
->ap
;
3684 if (ata_should_dma_map(qc
)) {
3685 if (qc
->flags
& ATA_QCFLAG_SG
) {
3686 if (ata_sg_setup(qc
))
3688 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3689 if (ata_sg_setup_one(qc
))
3693 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3696 ap
->ops
->qc_prep(qc
);
3698 qc
->ap
->active_tag
= qc
->tag
;
3699 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3701 return ap
->ops
->qc_issue(qc
);
3704 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3710 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3711 * @qc: command to issue to device
3713 * Using various libata functions and hooks, this function
3714 * starts an ATA command. ATA commands are grouped into
3715 * classes called "protocols", and issuing each type of protocol
3716 * is slightly different.
3718 * May be used as the qc_issue() entry in ata_port_operations.
3721 * spin_lock_irqsave(host_set lock)
3724 * Zero on success, negative on error.
3727 int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3729 struct ata_port
*ap
= qc
->ap
;
3731 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3733 switch (qc
->tf
.protocol
) {
3734 case ATA_PROT_NODATA
:
3735 ata_tf_to_host(ap
, &qc
->tf
);
3739 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3740 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3741 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3744 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
3745 ata_qc_set_polling(qc
);
3746 ata_tf_to_host(ap
, &qc
->tf
);
3747 ap
->hsm_task_state
= HSM_ST
;
3748 queue_work(ata_wq
, &ap
->pio_task
);
3751 case ATA_PROT_ATAPI
:
3752 ata_qc_set_polling(qc
);
3753 ata_tf_to_host(ap
, &qc
->tf
);
3754 queue_work(ata_wq
, &ap
->packet_task
);
3757 case ATA_PROT_ATAPI_NODATA
:
3758 ap
->flags
|= ATA_FLAG_NOINTR
;
3759 ata_tf_to_host(ap
, &qc
->tf
);
3760 queue_work(ata_wq
, &ap
->packet_task
);
3763 case ATA_PROT_ATAPI_DMA
:
3764 ap
->flags
|= ATA_FLAG_NOINTR
;
3765 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3766 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3767 queue_work(ata_wq
, &ap
->packet_task
);
3779 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3780 * @qc: Info associated with this ATA transaction.
3783 * spin_lock_irqsave(host_set lock)
3786 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
3788 struct ata_port
*ap
= qc
->ap
;
3789 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3791 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3793 /* load PRD table addr. */
3794 mb(); /* make sure PRD table writes are visible to controller */
3795 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
3797 /* specify data direction, triple-check start bit is clear */
3798 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3799 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3801 dmactl
|= ATA_DMA_WR
;
3802 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
3804 /* issue r/w command */
3805 ap
->ops
->exec_command(ap
, &qc
->tf
);
3809 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
3810 * @qc: Info associated with this ATA transaction.
3813 * spin_lock_irqsave(host_set lock)
3816 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
3818 struct ata_port
*ap
= qc
->ap
;
3819 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3822 /* start host DMA transaction */
3823 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3824 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
3826 /* Strictly, one may wish to issue a readb() here, to
3827 * flush the mmio write. However, control also passes
3828 * to the hardware at this point, and it will interrupt
3829 * us when we are to resume control. So, in effect,
3830 * we don't care when the mmio write flushes.
3831 * Further, a read of the DMA status register _immediately_
3832 * following the write may not be what certain flaky hardware
3833 * is expected, so I think it is best to not add a readb()
3834 * without first all the MMIO ATA cards/mobos.
3835 * Or maybe I'm just being paranoid.
3840 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3841 * @qc: Info associated with this ATA transaction.
3844 * spin_lock_irqsave(host_set lock)
3847 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
3849 struct ata_port
*ap
= qc
->ap
;
3850 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3853 /* load PRD table addr. */
3854 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
3856 /* specify data direction, triple-check start bit is clear */
3857 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3858 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3860 dmactl
|= ATA_DMA_WR
;
3861 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3863 /* issue r/w command */
3864 ap
->ops
->exec_command(ap
, &qc
->tf
);
3868 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3869 * @qc: Info associated with this ATA transaction.
3872 * spin_lock_irqsave(host_set lock)
3875 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
3877 struct ata_port
*ap
= qc
->ap
;
3880 /* start host DMA transaction */
3881 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3882 outb(dmactl
| ATA_DMA_START
,
3883 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3888 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3889 * @qc: Info associated with this ATA transaction.
3891 * Writes the ATA_DMA_START flag to the DMA command register.
3893 * May be used as the bmdma_start() entry in ata_port_operations.
3896 * spin_lock_irqsave(host_set lock)
3898 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
3900 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3901 ata_bmdma_start_mmio(qc
);
3903 ata_bmdma_start_pio(qc
);
3908 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3909 * @qc: Info associated with this ATA transaction.
3911 * Writes address of PRD table to device's PRD Table Address
3912 * register, sets the DMA control register, and calls
3913 * ops->exec_command() to start the transfer.
3915 * May be used as the bmdma_setup() entry in ata_port_operations.
3918 * spin_lock_irqsave(host_set lock)
3920 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
3922 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3923 ata_bmdma_setup_mmio(qc
);
3925 ata_bmdma_setup_pio(qc
);
3930 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
3931 * @ap: Port associated with this ATA transaction.
3933 * Clear interrupt and error flags in DMA status register.
3935 * May be used as the irq_clear() entry in ata_port_operations.
3938 * spin_lock_irqsave(host_set lock)
3941 void ata_bmdma_irq_clear(struct ata_port
*ap
)
3943 if (ap
->flags
& ATA_FLAG_MMIO
) {
3944 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
3945 writeb(readb(mmio
), mmio
);
3947 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
3948 outb(inb(addr
), addr
);
3955 * ata_bmdma_status - Read PCI IDE BMDMA status
3956 * @ap: Port associated with this ATA transaction.
3958 * Read and return BMDMA status register.
3960 * May be used as the bmdma_status() entry in ata_port_operations.
3963 * spin_lock_irqsave(host_set lock)
3966 u8
ata_bmdma_status(struct ata_port
*ap
)
3969 if (ap
->flags
& ATA_FLAG_MMIO
) {
3970 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3971 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
3973 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
3979 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
3980 * @qc: Command we are ending DMA for
3982 * Clears the ATA_DMA_START flag in the dma control register
3984 * May be used as the bmdma_stop() entry in ata_port_operations.
3987 * spin_lock_irqsave(host_set lock)
3990 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
3992 struct ata_port
*ap
= qc
->ap
;
3993 if (ap
->flags
& ATA_FLAG_MMIO
) {
3994 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3996 /* clear start/stop bit */
3997 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
3998 mmio
+ ATA_DMA_CMD
);
4000 /* clear start/stop bit */
4001 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4002 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4005 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4006 ata_altstatus(ap
); /* dummy read */
4010 * ata_host_intr - Handle host interrupt for given (port, task)
4011 * @ap: Port on which interrupt arrived (possibly...)
4012 * @qc: Taskfile currently active in engine
4014 * Handle host interrupt for given queued command. Currently,
4015 * only DMA interrupts are handled. All other commands are
4016 * handled via polling with interrupts disabled (nIEN bit).
4019 * spin_lock_irqsave(host_set lock)
4022 * One if interrupt was handled, zero if not (shared irq).
4025 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4026 struct ata_queued_cmd
*qc
)
4028 u8 status
, host_stat
;
4030 switch (qc
->tf
.protocol
) {
4033 case ATA_PROT_ATAPI_DMA
:
4034 case ATA_PROT_ATAPI
:
4035 /* check status of DMA engine */
4036 host_stat
= ap
->ops
->bmdma_status(ap
);
4037 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4039 /* if it's not our irq... */
4040 if (!(host_stat
& ATA_DMA_INTR
))
4043 /* before we do anything else, clear DMA-Start bit */
4044 ap
->ops
->bmdma_stop(qc
);
4048 case ATA_PROT_ATAPI_NODATA
:
4049 case ATA_PROT_NODATA
:
4050 /* check altstatus */
4051 status
= ata_altstatus(ap
);
4052 if (status
& ATA_BUSY
)
4055 /* check main status, clearing INTRQ */
4056 status
= ata_chk_status(ap
);
4057 if (unlikely(status
& ATA_BUSY
))
4059 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4060 ap
->id
, qc
->tf
.protocol
, status
);
4062 /* ack bmdma irq events */
4063 ap
->ops
->irq_clear(ap
);
4065 /* complete taskfile transaction */
4066 qc
->err_mask
|= ac_err_mask(status
);
4067 ata_qc_complete(qc
);
4074 return 1; /* irq handled */
4077 ap
->stats
.idle_irq
++;
4080 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4082 ata_irq_ack(ap
, 0); /* debug trap */
4083 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4086 return 0; /* irq not handled */
4090 * ata_interrupt - Default ATA host interrupt handler
4091 * @irq: irq line (unused)
4092 * @dev_instance: pointer to our ata_host_set information structure
4095 * Default interrupt handler for PCI IDE devices. Calls
4096 * ata_host_intr() for each port that is not disabled.
4099 * Obtains host_set lock during operation.
4102 * IRQ_NONE or IRQ_HANDLED.
4105 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4107 struct ata_host_set
*host_set
= dev_instance
;
4109 unsigned int handled
= 0;
4110 unsigned long flags
;
4112 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4113 spin_lock_irqsave(&host_set
->lock
, flags
);
4115 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4116 struct ata_port
*ap
;
4118 ap
= host_set
->ports
[i
];
4120 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4121 struct ata_queued_cmd
*qc
;
4123 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4124 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4125 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4126 handled
|= ata_host_intr(ap
, qc
);
4130 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4132 return IRQ_RETVAL(handled
);
4136 * atapi_packet_task - Write CDB bytes to hardware
4137 * @_data: Port to which ATAPI device is attached.
4139 * When device has indicated its readiness to accept
4140 * a CDB, this function is called. Send the CDB.
4141 * If DMA is to be performed, exit immediately.
4142 * Otherwise, we are in polling mode, so poll
4143 * status under operation succeeds or fails.
4146 * Kernel thread context (may sleep)
4149 static void atapi_packet_task(void *_data
)
4151 struct ata_port
*ap
= _data
;
4152 struct ata_queued_cmd
*qc
;
4155 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4157 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
4159 /* sleep-wait for BSY to clear */
4160 DPRINTK("busy wait\n");
4161 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
4162 qc
->err_mask
|= AC_ERR_TIMEOUT
;
4166 /* make sure DRQ is set */
4167 status
= ata_chk_status(ap
);
4168 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
4169 qc
->err_mask
|= AC_ERR_HSM
;
4174 DPRINTK("send cdb\n");
4175 assert(ap
->cdb_len
>= 12);
4177 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
4178 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4179 unsigned long flags
;
4181 /* Once we're done issuing command and kicking bmdma,
4182 * irq handler takes over. To not lose irq, we need
4183 * to clear NOINTR flag before sending cdb, but
4184 * interrupt handler shouldn't be invoked before we're
4185 * finished. Hence, the following locking.
4187 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4188 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4189 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
4190 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4191 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4192 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4194 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
4196 /* PIO commands are handled by polling */
4197 ap
->hsm_task_state
= HSM_ST
;
4198 queue_work(ata_wq
, &ap
->pio_task
);
4204 ata_poll_qc_complete(qc
);
4209 * ata_port_start - Set port up for dma.
4210 * @ap: Port to initialize
4212 * Called just after data structures for each port are
4213 * initialized. Allocates space for PRD table.
4215 * May be used as the port_start() entry in ata_port_operations.
4218 * Inherited from caller.
4222 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4223 * without filling any other registers
4225 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4228 struct ata_taskfile tf
;
4231 ata_tf_init(ap
, &tf
, dev
->devno
);
4234 tf
.flags
|= ATA_TFLAG_DEVICE
;
4235 tf
.protocol
= ATA_PROT_NODATA
;
4237 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4239 printk(KERN_ERR
"%s: ata command failed: %d\n",
4245 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4249 if (!ata_try_flush_cache(dev
))
4252 if (ata_id_has_flush_ext(dev
->id
))
4253 cmd
= ATA_CMD_FLUSH_EXT
;
4255 cmd
= ATA_CMD_FLUSH
;
4257 return ata_do_simple_cmd(ap
, dev
, cmd
);
4260 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4262 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4265 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4267 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4271 * ata_device_resume - wakeup a previously suspended devices
4273 * Kick the drive back into action, by sending it an idle immediate
4274 * command and making sure its transfer mode matches between drive
4278 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4280 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4281 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4284 if (!ata_dev_present(dev
))
4286 if (dev
->class == ATA_DEV_ATA
)
4287 ata_start_drive(ap
, dev
);
4293 * ata_device_suspend - prepare a device for suspend
4295 * Flush the cache on the drive, if appropriate, then issue a
4296 * standbynow command.
4299 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4301 if (!ata_dev_present(dev
))
4303 if (dev
->class == ATA_DEV_ATA
)
4304 ata_flush_cache(ap
, dev
);
4306 ata_standby_drive(ap
, dev
);
4307 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4311 int ata_port_start (struct ata_port
*ap
)
4313 struct device
*dev
= ap
->host_set
->dev
;
4316 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4320 rc
= ata_pad_alloc(ap
, dev
);
4322 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4326 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4333 * ata_port_stop - Undo ata_port_start()
4334 * @ap: Port to shut down
4336 * Frees the PRD table.
4338 * May be used as the port_stop() entry in ata_port_operations.
4341 * Inherited from caller.
4344 void ata_port_stop (struct ata_port
*ap
)
4346 struct device
*dev
= ap
->host_set
->dev
;
4348 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4349 ata_pad_free(ap
, dev
);
4352 void ata_host_stop (struct ata_host_set
*host_set
)
4354 if (host_set
->mmio_base
)
4355 iounmap(host_set
->mmio_base
);
4360 * ata_host_remove - Unregister SCSI host structure with upper layers
4361 * @ap: Port to unregister
4362 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4365 * Inherited from caller.
4368 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4370 struct Scsi_Host
*sh
= ap
->host
;
4375 scsi_remove_host(sh
);
4377 ap
->ops
->port_stop(ap
);
4381 * ata_host_init - Initialize an ata_port structure
4382 * @ap: Structure to initialize
4383 * @host: associated SCSI mid-layer structure
4384 * @host_set: Collection of hosts to which @ap belongs
4385 * @ent: Probe information provided by low-level driver
4386 * @port_no: Port number associated with this ata_port
4388 * Initialize a new ata_port structure, and its associated
4392 * Inherited from caller.
4395 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4396 struct ata_host_set
*host_set
,
4397 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4403 host
->max_channel
= 1;
4404 host
->unique_id
= ata_unique_id
++;
4405 host
->max_cmd_len
= 12;
4407 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4408 ap
->id
= host
->unique_id
;
4410 ap
->ctl
= ATA_DEVCTL_OBS
;
4411 ap
->host_set
= host_set
;
4412 ap
->port_no
= port_no
;
4414 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4415 ap
->pio_mask
= ent
->pio_mask
;
4416 ap
->mwdma_mask
= ent
->mwdma_mask
;
4417 ap
->udma_mask
= ent
->udma_mask
;
4418 ap
->flags
|= ent
->host_flags
;
4419 ap
->ops
= ent
->port_ops
;
4420 ap
->cbl
= ATA_CBL_NONE
;
4421 ap
->active_tag
= ATA_TAG_POISON
;
4422 ap
->last_ctl
= 0xFF;
4424 INIT_WORK(&ap
->packet_task
, atapi_packet_task
, ap
);
4425 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
4427 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4428 ap
->device
[i
].devno
= i
;
4431 ap
->stats
.unhandled_irq
= 1;
4432 ap
->stats
.idle_irq
= 1;
4435 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4439 * ata_host_add - Attach low-level ATA driver to system
4440 * @ent: Information provided by low-level driver
4441 * @host_set: Collections of ports to which we add
4442 * @port_no: Port number associated with this host
4444 * Attach low-level ATA driver to system.
4447 * PCI/etc. bus probe sem.
4450 * New ata_port on success, for NULL on error.
4453 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4454 struct ata_host_set
*host_set
,
4455 unsigned int port_no
)
4457 struct Scsi_Host
*host
;
4458 struct ata_port
*ap
;
4462 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4466 ap
= (struct ata_port
*) &host
->hostdata
[0];
4468 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4470 rc
= ap
->ops
->port_start(ap
);
4477 scsi_host_put(host
);
4482 * ata_device_add - Register hardware device with ATA and SCSI layers
4483 * @ent: Probe information describing hardware device to be registered
4485 * This function processes the information provided in the probe
4486 * information struct @ent, allocates the necessary ATA and SCSI
4487 * host information structures, initializes them, and registers
4488 * everything with requisite kernel subsystems.
4490 * This function requests irqs, probes the ATA bus, and probes
4494 * PCI/etc. bus probe sem.
4497 * Number of ports registered. Zero on error (no ports registered).
4500 int ata_device_add(const struct ata_probe_ent
*ent
)
4502 unsigned int count
= 0, i
;
4503 struct device
*dev
= ent
->dev
;
4504 struct ata_host_set
*host_set
;
4507 /* alloc a container for our list of ATA ports (buses) */
4508 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4509 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4512 spin_lock_init(&host_set
->lock
);
4514 host_set
->dev
= dev
;
4515 host_set
->n_ports
= ent
->n_ports
;
4516 host_set
->irq
= ent
->irq
;
4517 host_set
->mmio_base
= ent
->mmio_base
;
4518 host_set
->private_data
= ent
->private_data
;
4519 host_set
->ops
= ent
->port_ops
;
4521 /* register each port bound to this device */
4522 for (i
= 0; i
< ent
->n_ports
; i
++) {
4523 struct ata_port
*ap
;
4524 unsigned long xfer_mode_mask
;
4526 ap
= ata_host_add(ent
, host_set
, i
);
4530 host_set
->ports
[i
] = ap
;
4531 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4532 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4533 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4535 /* print per-port info to dmesg */
4536 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4537 "bmdma 0x%lX irq %lu\n",
4539 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4540 ata_mode_string(xfer_mode_mask
),
4541 ap
->ioaddr
.cmd_addr
,
4542 ap
->ioaddr
.ctl_addr
,
4543 ap
->ioaddr
.bmdma_addr
,
4547 host_set
->ops
->irq_clear(ap
);
4554 /* obtain irq, that is shared between channels */
4555 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4556 DRV_NAME
, host_set
))
4559 /* perform each probe synchronously */
4560 DPRINTK("probe begin\n");
4561 for (i
= 0; i
< count
; i
++) {
4562 struct ata_port
*ap
;
4565 ap
= host_set
->ports
[i
];
4567 DPRINTK("ata%u: probe begin\n", ap
->id
);
4568 rc
= ata_bus_probe(ap
);
4569 DPRINTK("ata%u: probe end\n", ap
->id
);
4572 /* FIXME: do something useful here?
4573 * Current libata behavior will
4574 * tear down everything when
4575 * the module is removed
4576 * or the h/w is unplugged.
4580 rc
= scsi_add_host(ap
->host
, dev
);
4582 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4584 /* FIXME: do something useful here */
4585 /* FIXME: handle unconditional calls to
4586 * scsi_scan_host and ata_host_remove, below,
4592 /* probes are done, now scan each port's disk(s) */
4593 DPRINTK("probe begin\n");
4594 for (i
= 0; i
< count
; i
++) {
4595 struct ata_port
*ap
= host_set
->ports
[i
];
4597 ata_scsi_scan_host(ap
);
4600 dev_set_drvdata(dev
, host_set
);
4602 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4603 return ent
->n_ports
; /* success */
4606 for (i
= 0; i
< count
; i
++) {
4607 ata_host_remove(host_set
->ports
[i
], 1);
4608 scsi_host_put(host_set
->ports
[i
]->host
);
4612 VPRINTK("EXIT, returning 0\n");
4617 * ata_host_set_remove - PCI layer callback for device removal
4618 * @host_set: ATA host set that was removed
4620 * Unregister all objects associated with this host set. Free those
4624 * Inherited from calling layer (may sleep).
4627 void ata_host_set_remove(struct ata_host_set
*host_set
)
4629 struct ata_port
*ap
;
4632 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4633 ap
= host_set
->ports
[i
];
4634 scsi_remove_host(ap
->host
);
4637 free_irq(host_set
->irq
, host_set
);
4639 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4640 ap
= host_set
->ports
[i
];
4642 ata_scsi_release(ap
->host
);
4644 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4645 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4647 if (ioaddr
->cmd_addr
== 0x1f0)
4648 release_region(0x1f0, 8);
4649 else if (ioaddr
->cmd_addr
== 0x170)
4650 release_region(0x170, 8);
4653 scsi_host_put(ap
->host
);
4656 if (host_set
->ops
->host_stop
)
4657 host_set
->ops
->host_stop(host_set
);
4663 * ata_scsi_release - SCSI layer callback hook for host unload
4664 * @host: libata host to be unloaded
4666 * Performs all duties necessary to shut down a libata port...
4667 * Kill port kthread, disable port, and release resources.
4670 * Inherited from SCSI layer.
4676 int ata_scsi_release(struct Scsi_Host
*host
)
4678 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4682 ap
->ops
->port_disable(ap
);
4683 ata_host_remove(ap
, 0);
4690 * ata_std_ports - initialize ioaddr with standard port offsets.
4691 * @ioaddr: IO address structure to be initialized
4693 * Utility function which initializes data_addr, error_addr,
4694 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4695 * device_addr, status_addr, and command_addr to standard offsets
4696 * relative to cmd_addr.
4698 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4701 void ata_std_ports(struct ata_ioports
*ioaddr
)
4703 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4704 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4705 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4706 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4707 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4708 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4709 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4710 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4711 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4712 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4715 static struct ata_probe_ent
*
4716 ata_probe_ent_alloc(struct device
*dev
, const struct ata_port_info
*port
)
4718 struct ata_probe_ent
*probe_ent
;
4720 probe_ent
= kzalloc(sizeof(*probe_ent
), GFP_KERNEL
);
4722 printk(KERN_ERR DRV_NAME
"(%s): out of memory\n",
4723 kobject_name(&(dev
->kobj
)));
4727 INIT_LIST_HEAD(&probe_ent
->node
);
4728 probe_ent
->dev
= dev
;
4730 probe_ent
->sht
= port
->sht
;
4731 probe_ent
->host_flags
= port
->host_flags
;
4732 probe_ent
->pio_mask
= port
->pio_mask
;
4733 probe_ent
->mwdma_mask
= port
->mwdma_mask
;
4734 probe_ent
->udma_mask
= port
->udma_mask
;
4735 probe_ent
->port_ops
= port
->port_ops
;
4744 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4746 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4748 pci_iounmap(pdev
, host_set
->mmio_base
);
4752 * ata_pci_init_native_mode - Initialize native-mode driver
4753 * @pdev: pci device to be initialized
4754 * @port: array[2] of pointers to port info structures.
4755 * @ports: bitmap of ports present
4757 * Utility function which allocates and initializes an
4758 * ata_probe_ent structure for a standard dual-port
4759 * PIO-based IDE controller. The returned ata_probe_ent
4760 * structure can be passed to ata_device_add(). The returned
4761 * ata_probe_ent structure should then be freed with kfree().
4763 * The caller need only pass the address of the primary port, the
4764 * secondary will be deduced automatically. If the device has non
4765 * standard secondary port mappings this function can be called twice,
4766 * once for each interface.
4769 struct ata_probe_ent
*
4770 ata_pci_init_native_mode(struct pci_dev
*pdev
, struct ata_port_info
**port
, int ports
)
4772 struct ata_probe_ent
*probe_ent
=
4773 ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
[0]);
4779 probe_ent
->irq
= pdev
->irq
;
4780 probe_ent
->irq_flags
= SA_SHIRQ
;
4781 probe_ent
->private_data
= port
[0]->private_data
;
4783 if (ports
& ATA_PORT_PRIMARY
) {
4784 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 0);
4785 probe_ent
->port
[p
].altstatus_addr
=
4786 probe_ent
->port
[p
].ctl_addr
=
4787 pci_resource_start(pdev
, 1) | ATA_PCI_CTL_OFS
;
4788 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4);
4789 ata_std_ports(&probe_ent
->port
[p
]);
4793 if (ports
& ATA_PORT_SECONDARY
) {
4794 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 2);
4795 probe_ent
->port
[p
].altstatus_addr
=
4796 probe_ent
->port
[p
].ctl_addr
=
4797 pci_resource_start(pdev
, 3) | ATA_PCI_CTL_OFS
;
4798 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4) + 8;
4799 ata_std_ports(&probe_ent
->port
[p
]);
4803 probe_ent
->n_ports
= p
;
4807 static struct ata_probe_ent
*ata_pci_init_legacy_port(struct pci_dev
*pdev
, struct ata_port_info
*port
, int port_num
)
4809 struct ata_probe_ent
*probe_ent
;
4811 probe_ent
= ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
);
4815 probe_ent
->legacy_mode
= 1;
4816 probe_ent
->n_ports
= 1;
4817 probe_ent
->hard_port_no
= port_num
;
4818 probe_ent
->private_data
= port
->private_data
;
4823 probe_ent
->irq
= 14;
4824 probe_ent
->port
[0].cmd_addr
= 0x1f0;
4825 probe_ent
->port
[0].altstatus_addr
=
4826 probe_ent
->port
[0].ctl_addr
= 0x3f6;
4829 probe_ent
->irq
= 15;
4830 probe_ent
->port
[0].cmd_addr
= 0x170;
4831 probe_ent
->port
[0].altstatus_addr
=
4832 probe_ent
->port
[0].ctl_addr
= 0x376;
4835 probe_ent
->port
[0].bmdma_addr
= pci_resource_start(pdev
, 4) + 8 * port_num
;
4836 ata_std_ports(&probe_ent
->port
[0]);
4841 * ata_pci_init_one - Initialize/register PCI IDE host controller
4842 * @pdev: Controller to be initialized
4843 * @port_info: Information from low-level host driver
4844 * @n_ports: Number of ports attached to host controller
4846 * This is a helper function which can be called from a driver's
4847 * xxx_init_one() probe function if the hardware uses traditional
4848 * IDE taskfile registers.
4850 * This function calls pci_enable_device(), reserves its register
4851 * regions, sets the dma mask, enables bus master mode, and calls
4855 * Inherited from PCI layer (may sleep).
4858 * Zero on success, negative on errno-based value on error.
4861 int ata_pci_init_one (struct pci_dev
*pdev
, struct ata_port_info
**port_info
,
4862 unsigned int n_ports
)
4864 struct ata_probe_ent
*probe_ent
= NULL
, *probe_ent2
= NULL
;
4865 struct ata_port_info
*port
[2];
4867 unsigned int legacy_mode
= 0;
4868 int disable_dev_on_err
= 1;
4873 port
[0] = port_info
[0];
4875 port
[1] = port_info
[1];
4879 if ((port
[0]->host_flags
& ATA_FLAG_NO_LEGACY
) == 0
4880 && (pdev
->class >> 8) == PCI_CLASS_STORAGE_IDE
) {
4881 /* TODO: What if one channel is in native mode ... */
4882 pci_read_config_byte(pdev
, PCI_CLASS_PROG
, &tmp8
);
4883 mask
= (1 << 2) | (1 << 0);
4884 if ((tmp8
& mask
) != mask
)
4885 legacy_mode
= (1 << 3);
4889 if ((!legacy_mode
) && (n_ports
> 2)) {
4890 printk(KERN_ERR
"ata: BUG: native mode, n_ports > 2\n");
4895 /* FIXME: Really for ATA it isn't safe because the device may be
4896 multi-purpose and we want to leave it alone if it was already
4897 enabled. Secondly for shared use as Arjan says we want refcounting
4899 Checking dev->is_enabled is insufficient as this is not set at
4900 boot for the primary video which is BIOS enabled
4903 rc
= pci_enable_device(pdev
);
4907 rc
= pci_request_regions(pdev
, DRV_NAME
);
4909 disable_dev_on_err
= 0;
4913 /* FIXME: Should use platform specific mappers for legacy port ranges */
4915 if (!request_region(0x1f0, 8, "libata")) {
4916 struct resource
*conflict
, res
;
4918 res
.end
= 0x1f0 + 8 - 1;
4919 conflict
= ____request_resource(&ioport_resource
, &res
);
4920 if (!strcmp(conflict
->name
, "libata"))
4921 legacy_mode
|= (1 << 0);
4923 disable_dev_on_err
= 0;
4924 printk(KERN_WARNING
"ata: 0x1f0 IDE port busy\n");
4927 legacy_mode
|= (1 << 0);
4929 if (!request_region(0x170, 8, "libata")) {
4930 struct resource
*conflict
, res
;
4932 res
.end
= 0x170 + 8 - 1;
4933 conflict
= ____request_resource(&ioport_resource
, &res
);
4934 if (!strcmp(conflict
->name
, "libata"))
4935 legacy_mode
|= (1 << 1);
4937 disable_dev_on_err
= 0;
4938 printk(KERN_WARNING
"ata: 0x170 IDE port busy\n");
4941 legacy_mode
|= (1 << 1);
4944 /* we have legacy mode, but all ports are unavailable */
4945 if (legacy_mode
== (1 << 3)) {
4947 goto err_out_regions
;
4950 rc
= pci_set_dma_mask(pdev
, ATA_DMA_MASK
);
4952 goto err_out_regions
;
4953 rc
= pci_set_consistent_dma_mask(pdev
, ATA_DMA_MASK
);
4955 goto err_out_regions
;
4958 if (legacy_mode
& (1 << 0))
4959 probe_ent
= ata_pci_init_legacy_port(pdev
, port
[0], 0);
4960 if (legacy_mode
& (1 << 1))
4961 probe_ent2
= ata_pci_init_legacy_port(pdev
, port
[1], 1);
4964 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
| ATA_PORT_SECONDARY
);
4966 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
);
4968 if (!probe_ent
&& !probe_ent2
) {
4970 goto err_out_regions
;
4973 pci_set_master(pdev
);
4975 /* FIXME: check ata_device_add return */
4977 if (legacy_mode
& (1 << 0))
4978 ata_device_add(probe_ent
);
4979 if (legacy_mode
& (1 << 1))
4980 ata_device_add(probe_ent2
);
4982 ata_device_add(probe_ent
);
4990 if (legacy_mode
& (1 << 0))
4991 release_region(0x1f0, 8);
4992 if (legacy_mode
& (1 << 1))
4993 release_region(0x170, 8);
4994 pci_release_regions(pdev
);
4996 if (disable_dev_on_err
)
4997 pci_disable_device(pdev
);
5002 * ata_pci_remove_one - PCI layer callback for device removal
5003 * @pdev: PCI device that was removed
5005 * PCI layer indicates to libata via this hook that
5006 * hot-unplug or module unload event has occurred.
5007 * Handle this by unregistering all objects associated
5008 * with this PCI device. Free those objects. Then finally
5009 * release PCI resources and disable device.
5012 * Inherited from PCI layer (may sleep).
5015 void ata_pci_remove_one (struct pci_dev
*pdev
)
5017 struct device
*dev
= pci_dev_to_dev(pdev
);
5018 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5020 ata_host_set_remove(host_set
);
5021 pci_release_regions(pdev
);
5022 pci_disable_device(pdev
);
5023 dev_set_drvdata(dev
, NULL
);
5026 /* move to PCI subsystem */
5027 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5029 unsigned long tmp
= 0;
5031 switch (bits
->width
) {
5034 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5040 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5046 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5057 return (tmp
== bits
->val
) ? 1 : 0;
5060 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5062 pci_save_state(pdev
);
5063 pci_disable_device(pdev
);
5064 pci_set_power_state(pdev
, PCI_D3hot
);
5068 int ata_pci_device_resume(struct pci_dev
*pdev
)
5070 pci_set_power_state(pdev
, PCI_D0
);
5071 pci_restore_state(pdev
);
5072 pci_enable_device(pdev
);
5073 pci_set_master(pdev
);
5076 #endif /* CONFIG_PCI */
5079 static int __init
ata_init(void)
5081 ata_wq
= create_workqueue("ata");
5085 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5089 static void __exit
ata_exit(void)
5091 destroy_workqueue(ata_wq
);
5094 module_init(ata_init
);
5095 module_exit(ata_exit
);
5097 static unsigned long ratelimit_time
;
5098 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5100 int ata_ratelimit(void)
5103 unsigned long flags
;
5105 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5107 if (time_after(jiffies
, ratelimit_time
)) {
5109 ratelimit_time
= jiffies
+ (HZ
/5);
5113 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5119 * libata is essentially a library of internal helper functions for
5120 * low-level ATA host controller drivers. As such, the API/ABI is
5121 * likely to change as new drivers are added and updated.
5122 * Do not depend on ABI/API stability.
5125 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5126 EXPORT_SYMBOL_GPL(ata_std_ports
);
5127 EXPORT_SYMBOL_GPL(ata_device_add
);
5128 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5129 EXPORT_SYMBOL_GPL(ata_sg_init
);
5130 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5131 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5132 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5133 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5134 EXPORT_SYMBOL_GPL(ata_tf_load
);
5135 EXPORT_SYMBOL_GPL(ata_tf_read
);
5136 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5137 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5138 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5139 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5140 EXPORT_SYMBOL_GPL(ata_check_status
);
5141 EXPORT_SYMBOL_GPL(ata_altstatus
);
5142 EXPORT_SYMBOL_GPL(ata_exec_command
);
5143 EXPORT_SYMBOL_GPL(ata_port_start
);
5144 EXPORT_SYMBOL_GPL(ata_port_stop
);
5145 EXPORT_SYMBOL_GPL(ata_host_stop
);
5146 EXPORT_SYMBOL_GPL(ata_interrupt
);
5147 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5148 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5149 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5150 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5151 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5152 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5153 EXPORT_SYMBOL_GPL(ata_port_probe
);
5154 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5155 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5156 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5157 EXPORT_SYMBOL_GPL(ata_port_disable
);
5158 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5159 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5160 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5161 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5162 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5163 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5164 EXPORT_SYMBOL_GPL(ata_host_intr
);
5165 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5166 EXPORT_SYMBOL_GPL(ata_dev_id_string
);
5167 EXPORT_SYMBOL_GPL(ata_dev_config
);
5168 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5170 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5171 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5172 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5175 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5176 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5177 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5178 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5179 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5180 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5181 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5182 #endif /* CONFIG_PCI */
5184 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5185 EXPORT_SYMBOL_GPL(ata_device_resume
);
5186 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5187 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);