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
))
1131 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1133 if (!wait_for_completion_timeout(&wait
, ATA_TMOUT_INTERNAL
)) {
1134 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
1136 /* We're racing with irq here. If we lose, the
1137 * following test prevents us from completing the qc
1138 * again. If completion irq occurs after here but
1139 * before the caller cleans up, it will result in a
1140 * spurious interrupt. We can live with that.
1142 if (qc
->flags
& ATA_QCFLAG_ACTIVE
) {
1143 qc
->err_mask
= AC_ERR_OTHER
;
1144 ata_qc_complete(qc
);
1145 printk(KERN_WARNING
"ata%u: qc timeout (cmd 0x%x)\n",
1149 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1153 err_mask
= qc
->err_mask
;
1161 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
1162 return AC_ERR_OTHER
;
1166 * ata_pio_need_iordy - check if iordy needed
1169 * Check if the current speed of the device requires IORDY. Used
1170 * by various controllers for chip configuration.
1173 unsigned int ata_pio_need_iordy(const struct ata_device
*adev
)
1176 int speed
= adev
->pio_mode
- XFER_PIO_0
;
1183 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1185 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE */
1186 pio
= adev
->id
[ATA_ID_EIDE_PIO
];
1187 /* Is the speed faster than the drive allows non IORDY ? */
1189 /* This is cycle times not frequency - watch the logic! */
1190 if (pio
> 240) /* PIO2 is 240nS per cycle */
1199 * ata_dev_identify - obtain IDENTIFY x DEVICE page
1200 * @ap: port on which device we wish to probe resides
1201 * @device: device bus address, starting at zero
1203 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
1204 * command, and read back the 512-byte device information page.
1205 * The device information page is fed to us via the standard
1206 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
1207 * using standard PIO-IN paths)
1209 * After reading the device information page, we use several
1210 * bits of information from it to initialize data structures
1211 * that will be used during the lifetime of the ata_device.
1212 * Other data from the info page is used to disqualify certain
1213 * older ATA devices we do not wish to support.
1216 * Inherited from caller. Some functions called by this function
1217 * obtain the host_set lock.
1220 static void ata_dev_identify(struct ata_port
*ap
, unsigned int device
)
1222 struct ata_device
*dev
= &ap
->device
[device
];
1223 unsigned int major_version
;
1225 unsigned long xfer_modes
;
1226 unsigned int using_edd
;
1227 struct ata_taskfile tf
;
1228 unsigned int err_mask
;
1231 if (!ata_dev_present(dev
)) {
1232 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1237 if (ap
->flags
& (ATA_FLAG_SRST
| ATA_FLAG_SATA_RESET
))
1242 DPRINTK("ENTER, host %u, dev %u\n", ap
->id
, device
);
1244 assert (dev
->class == ATA_DEV_ATA
|| dev
->class == ATA_DEV_ATAPI
||
1245 dev
->class == ATA_DEV_NONE
);
1247 ata_dev_select(ap
, device
, 1, 1); /* select device 0/1 */
1250 ata_tf_init(ap
, &tf
, device
);
1252 if (dev
->class == ATA_DEV_ATA
) {
1253 tf
.command
= ATA_CMD_ID_ATA
;
1254 DPRINTK("do ATA identify\n");
1256 tf
.command
= ATA_CMD_ID_ATAPI
;
1257 DPRINTK("do ATAPI identify\n");
1260 tf
.protocol
= ATA_PROT_PIO
;
1262 err_mask
= ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
1263 dev
->id
, sizeof(dev
->id
));
1266 if (err_mask
& ~AC_ERR_DEV
)
1270 * arg! EDD works for all test cases, but seems to return
1271 * the ATA signature for some ATAPI devices. Until the
1272 * reason for this is found and fixed, we fix up the mess
1273 * here. If IDENTIFY DEVICE returns command aborted
1274 * (as ATAPI devices do), then we issue an
1275 * IDENTIFY PACKET DEVICE.
1277 * ATA software reset (SRST, the default) does not appear
1278 * to have this problem.
1280 if ((using_edd
) && (dev
->class == ATA_DEV_ATA
)) {
1281 u8 err
= tf
.feature
;
1282 if (err
& ATA_ABORTED
) {
1283 dev
->class = ATA_DEV_ATAPI
;
1290 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
1292 /* print device capabilities */
1293 printk(KERN_DEBUG
"ata%u: dev %u cfg "
1294 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1295 ap
->id
, device
, dev
->id
[49],
1296 dev
->id
[82], dev
->id
[83], dev
->id
[84],
1297 dev
->id
[85], dev
->id
[86], dev
->id
[87],
1301 * common ATA, ATAPI feature tests
1304 /* we require DMA support (bits 8 of word 49) */
1305 if (!ata_id_has_dma(dev
->id
)) {
1306 printk(KERN_DEBUG
"ata%u: no dma\n", ap
->id
);
1310 /* quick-n-dirty find max transfer mode; for printk only */
1311 xfer_modes
= dev
->id
[ATA_ID_UDMA_MODES
];
1313 xfer_modes
= (dev
->id
[ATA_ID_MWDMA_MODES
]) << ATA_SHIFT_MWDMA
;
1315 xfer_modes
= ata_pio_modes(dev
);
1319 /* ATA-specific feature tests */
1320 if (dev
->class == ATA_DEV_ATA
) {
1321 if (!ata_id_is_ata(dev
->id
)) /* sanity check */
1324 /* get major version */
1325 tmp
= dev
->id
[ATA_ID_MAJOR_VER
];
1326 for (major_version
= 14; major_version
>= 1; major_version
--)
1327 if (tmp
& (1 << major_version
))
1331 * The exact sequence expected by certain pre-ATA4 drives is:
1334 * INITIALIZE DEVICE PARAMETERS
1336 * Some drives were very specific about that exact sequence.
1338 if (major_version
< 4 || (!ata_id_has_lba(dev
->id
))) {
1339 ata_dev_init_params(ap
, dev
);
1341 /* current CHS translation info (id[53-58]) might be
1342 * changed. reread the identify device info.
1344 ata_dev_reread_id(ap
, dev
);
1347 if (ata_id_has_lba(dev
->id
)) {
1348 dev
->flags
|= ATA_DFLAG_LBA
;
1350 if (ata_id_has_lba48(dev
->id
)) {
1351 dev
->flags
|= ATA_DFLAG_LBA48
;
1352 dev
->n_sectors
= ata_id_u64(dev
->id
, 100);
1354 dev
->n_sectors
= ata_id_u32(dev
->id
, 60);
1357 /* print device info to dmesg */
1358 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1361 ata_mode_string(xfer_modes
),
1362 (unsigned long long)dev
->n_sectors
,
1363 dev
->flags
& ATA_DFLAG_LBA48
? " LBA48" : " LBA");
1367 /* Default translation */
1368 dev
->cylinders
= dev
->id
[1];
1369 dev
->heads
= dev
->id
[3];
1370 dev
->sectors
= dev
->id
[6];
1371 dev
->n_sectors
= dev
->cylinders
* dev
->heads
* dev
->sectors
;
1373 if (ata_id_current_chs_valid(dev
->id
)) {
1374 /* Current CHS translation is valid. */
1375 dev
->cylinders
= dev
->id
[54];
1376 dev
->heads
= dev
->id
[55];
1377 dev
->sectors
= dev
->id
[56];
1379 dev
->n_sectors
= ata_id_u32(dev
->id
, 57);
1382 /* print device info to dmesg */
1383 printk(KERN_INFO
"ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1386 ata_mode_string(xfer_modes
),
1387 (unsigned long long)dev
->n_sectors
,
1388 (int)dev
->cylinders
, (int)dev
->heads
, (int)dev
->sectors
);
1392 ap
->host
->max_cmd_len
= 16;
1395 /* ATAPI-specific feature tests */
1396 else if (dev
->class == ATA_DEV_ATAPI
) {
1397 if (ata_id_is_ata(dev
->id
)) /* sanity check */
1400 rc
= atapi_cdb_len(dev
->id
);
1401 if ((rc
< 12) || (rc
> ATAPI_CDB_LEN
)) {
1402 printk(KERN_WARNING
"ata%u: unsupported CDB len\n", ap
->id
);
1405 ap
->cdb_len
= (unsigned int) rc
;
1406 ap
->host
->max_cmd_len
= (unsigned char) ap
->cdb_len
;
1408 /* print device info to dmesg */
1409 printk(KERN_INFO
"ata%u: dev %u ATAPI, max %s\n",
1411 ata_mode_string(xfer_modes
));
1414 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap
));
1418 printk(KERN_WARNING
"ata%u: dev %u not supported, ignoring\n",
1421 dev
->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1422 DPRINTK("EXIT, err\n");
1426 static inline u8
ata_dev_knobble(const struct ata_port
*ap
)
1428 return ((ap
->cbl
== ATA_CBL_SATA
) && (!ata_id_is_sata(ap
->device
->id
)));
1432 * ata_dev_config - Run device specific handlers and check for
1433 * SATA->PATA bridges
1440 void ata_dev_config(struct ata_port
*ap
, unsigned int i
)
1442 /* limit bridge transfers to udma5, 200 sectors */
1443 if (ata_dev_knobble(ap
)) {
1444 printk(KERN_INFO
"ata%u(%u): applying bridge limits\n",
1445 ap
->id
, ap
->device
->devno
);
1446 ap
->udma_mask
&= ATA_UDMA5
;
1447 ap
->host
->max_sectors
= ATA_MAX_SECTORS
;
1448 ap
->host
->hostt
->max_sectors
= ATA_MAX_SECTORS
;
1449 ap
->device
[i
].flags
|= ATA_DFLAG_LOCK_SECTORS
;
1452 if (ap
->ops
->dev_config
)
1453 ap
->ops
->dev_config(ap
, &ap
->device
[i
]);
1457 * ata_bus_probe - Reset and probe ATA bus
1460 * Master ATA bus probing function. Initiates a hardware-dependent
1461 * bus reset, then attempts to identify any devices found on
1465 * PCI/etc. bus probe sem.
1468 * Zero on success, non-zero on error.
1471 static int ata_bus_probe(struct ata_port
*ap
)
1473 unsigned int i
, found
= 0;
1475 ap
->ops
->phy_reset(ap
);
1476 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1479 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1480 ata_dev_identify(ap
, i
);
1481 if (ata_dev_present(&ap
->device
[i
])) {
1483 ata_dev_config(ap
,i
);
1487 if ((!found
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1488 goto err_out_disable
;
1491 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1492 goto err_out_disable
;
1497 ap
->ops
->port_disable(ap
);
1503 * ata_port_probe - Mark port as enabled
1504 * @ap: Port for which we indicate enablement
1506 * Modify @ap data structure such that the system
1507 * thinks that the entire port is enabled.
1509 * LOCKING: host_set lock, or some other form of
1513 void ata_port_probe(struct ata_port
*ap
)
1515 ap
->flags
&= ~ATA_FLAG_PORT_DISABLED
;
1519 * sata_print_link_status - Print SATA link status
1520 * @ap: SATA port to printk link status about
1522 * This function prints link speed and status of a SATA link.
1527 static void sata_print_link_status(struct ata_port
*ap
)
1532 if (!ap
->ops
->scr_read
)
1535 sstatus
= scr_read(ap
, SCR_STATUS
);
1537 if (sata_dev_present(ap
)) {
1538 tmp
= (sstatus
>> 4) & 0xf;
1541 else if (tmp
& (1 << 1))
1544 speed
= "<unknown>";
1545 printk(KERN_INFO
"ata%u: SATA link up %s Gbps (SStatus %X)\n",
1546 ap
->id
, speed
, sstatus
);
1548 printk(KERN_INFO
"ata%u: SATA link down (SStatus %X)\n",
1554 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1555 * @ap: SATA port associated with target SATA PHY.
1557 * This function issues commands to standard SATA Sxxx
1558 * PHY registers, to wake up the phy (and device), and
1559 * clear any reset condition.
1562 * PCI/etc. bus probe sem.
1565 void __sata_phy_reset(struct ata_port
*ap
)
1568 unsigned long timeout
= jiffies
+ (HZ
* 5);
1570 if (ap
->flags
& ATA_FLAG_SATA_RESET
) {
1571 /* issue phy wake/reset */
1572 scr_write_flush(ap
, SCR_CONTROL
, 0x301);
1573 /* Couldn't find anything in SATA I/II specs, but
1574 * AHCI-1.1 10.4.2 says at least 1 ms. */
1577 scr_write_flush(ap
, SCR_CONTROL
, 0x300); /* phy wake/clear reset */
1579 /* wait for phy to become ready, if necessary */
1582 sstatus
= scr_read(ap
, SCR_STATUS
);
1583 if ((sstatus
& 0xf) != 1)
1585 } while (time_before(jiffies
, timeout
));
1587 /* print link status */
1588 sata_print_link_status(ap
);
1590 /* TODO: phy layer with polling, timeouts, etc. */
1591 if (sata_dev_present(ap
))
1594 ata_port_disable(ap
);
1596 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1599 if (ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
)) {
1600 ata_port_disable(ap
);
1604 ap
->cbl
= ATA_CBL_SATA
;
1608 * sata_phy_reset - Reset SATA bus.
1609 * @ap: SATA port associated with target SATA PHY.
1611 * This function resets the SATA bus, and then probes
1612 * the bus for devices.
1615 * PCI/etc. bus probe sem.
1618 void sata_phy_reset(struct ata_port
*ap
)
1620 __sata_phy_reset(ap
);
1621 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1627 * ata_port_disable - Disable port.
1628 * @ap: Port to be disabled.
1630 * Modify @ap data structure such that the system
1631 * thinks that the entire port is disabled, and should
1632 * never attempt to probe or communicate with devices
1635 * LOCKING: host_set lock, or some other form of
1639 void ata_port_disable(struct ata_port
*ap
)
1641 ap
->device
[0].class = ATA_DEV_NONE
;
1642 ap
->device
[1].class = ATA_DEV_NONE
;
1643 ap
->flags
|= ATA_FLAG_PORT_DISABLED
;
1647 * This mode timing computation functionality is ported over from
1648 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1651 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1652 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1653 * for PIO 5, which is a nonstandard extension and UDMA6, which
1654 * is currently supported only by Maxtor drives.
1657 static const struct ata_timing ata_timing
[] = {
1659 { XFER_UDMA_6
, 0, 0, 0, 0, 0, 0, 0, 15 },
1660 { XFER_UDMA_5
, 0, 0, 0, 0, 0, 0, 0, 20 },
1661 { XFER_UDMA_4
, 0, 0, 0, 0, 0, 0, 0, 30 },
1662 { XFER_UDMA_3
, 0, 0, 0, 0, 0, 0, 0, 45 },
1664 { XFER_UDMA_2
, 0, 0, 0, 0, 0, 0, 0, 60 },
1665 { XFER_UDMA_1
, 0, 0, 0, 0, 0, 0, 0, 80 },
1666 { XFER_UDMA_0
, 0, 0, 0, 0, 0, 0, 0, 120 },
1668 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1670 { XFER_MW_DMA_2
, 25, 0, 0, 0, 70, 25, 120, 0 },
1671 { XFER_MW_DMA_1
, 45, 0, 0, 0, 80, 50, 150, 0 },
1672 { XFER_MW_DMA_0
, 60, 0, 0, 0, 215, 215, 480, 0 },
1674 { XFER_SW_DMA_2
, 60, 0, 0, 0, 120, 120, 240, 0 },
1675 { XFER_SW_DMA_1
, 90, 0, 0, 0, 240, 240, 480, 0 },
1676 { XFER_SW_DMA_0
, 120, 0, 0, 0, 480, 480, 960, 0 },
1678 /* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1679 { XFER_PIO_4
, 25, 70, 25, 120, 70, 25, 120, 0 },
1680 { XFER_PIO_3
, 30, 80, 70, 180, 80, 70, 180, 0 },
1682 { XFER_PIO_2
, 30, 290, 40, 330, 100, 90, 240, 0 },
1683 { XFER_PIO_1
, 50, 290, 93, 383, 125, 100, 383, 0 },
1684 { XFER_PIO_0
, 70, 290, 240, 600, 165, 150, 600, 0 },
1686 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1691 #define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1692 #define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1694 static void ata_timing_quantize(const struct ata_timing
*t
, struct ata_timing
*q
, int T
, int UT
)
1696 q
->setup
= EZ(t
->setup
* 1000, T
);
1697 q
->act8b
= EZ(t
->act8b
* 1000, T
);
1698 q
->rec8b
= EZ(t
->rec8b
* 1000, T
);
1699 q
->cyc8b
= EZ(t
->cyc8b
* 1000, T
);
1700 q
->active
= EZ(t
->active
* 1000, T
);
1701 q
->recover
= EZ(t
->recover
* 1000, T
);
1702 q
->cycle
= EZ(t
->cycle
* 1000, T
);
1703 q
->udma
= EZ(t
->udma
* 1000, UT
);
1706 void ata_timing_merge(const struct ata_timing
*a
, const struct ata_timing
*b
,
1707 struct ata_timing
*m
, unsigned int what
)
1709 if (what
& ATA_TIMING_SETUP
) m
->setup
= max(a
->setup
, b
->setup
);
1710 if (what
& ATA_TIMING_ACT8B
) m
->act8b
= max(a
->act8b
, b
->act8b
);
1711 if (what
& ATA_TIMING_REC8B
) m
->rec8b
= max(a
->rec8b
, b
->rec8b
);
1712 if (what
& ATA_TIMING_CYC8B
) m
->cyc8b
= max(a
->cyc8b
, b
->cyc8b
);
1713 if (what
& ATA_TIMING_ACTIVE
) m
->active
= max(a
->active
, b
->active
);
1714 if (what
& ATA_TIMING_RECOVER
) m
->recover
= max(a
->recover
, b
->recover
);
1715 if (what
& ATA_TIMING_CYCLE
) m
->cycle
= max(a
->cycle
, b
->cycle
);
1716 if (what
& ATA_TIMING_UDMA
) m
->udma
= max(a
->udma
, b
->udma
);
1719 static const struct ata_timing
* ata_timing_find_mode(unsigned short speed
)
1721 const struct ata_timing
*t
;
1723 for (t
= ata_timing
; t
->mode
!= speed
; t
++)
1724 if (t
->mode
== 0xFF)
1729 int ata_timing_compute(struct ata_device
*adev
, unsigned short speed
,
1730 struct ata_timing
*t
, int T
, int UT
)
1732 const struct ata_timing
*s
;
1733 struct ata_timing p
;
1739 if (!(s
= ata_timing_find_mode(speed
)))
1742 memcpy(t
, s
, sizeof(*s
));
1745 * If the drive is an EIDE drive, it can tell us it needs extended
1746 * PIO/MW_DMA cycle timing.
1749 if (adev
->id
[ATA_ID_FIELD_VALID
] & 2) { /* EIDE drive */
1750 memset(&p
, 0, sizeof(p
));
1751 if(speed
>= XFER_PIO_0
&& speed
<= XFER_SW_DMA_0
) {
1752 if (speed
<= XFER_PIO_2
) p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO
];
1753 else p
.cycle
= p
.cyc8b
= adev
->id
[ATA_ID_EIDE_PIO_IORDY
];
1754 } else if(speed
>= XFER_MW_DMA_0
&& speed
<= XFER_MW_DMA_2
) {
1755 p
.cycle
= adev
->id
[ATA_ID_EIDE_DMA_MIN
];
1757 ata_timing_merge(&p
, t
, t
, ATA_TIMING_CYCLE
| ATA_TIMING_CYC8B
);
1761 * Convert the timing to bus clock counts.
1764 ata_timing_quantize(t
, t
, T
, UT
);
1767 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY, S.M.A.R.T
1768 * and some other commands. We have to ensure that the DMA cycle timing is
1769 * slower/equal than the fastest PIO timing.
1772 if (speed
> XFER_PIO_4
) {
1773 ata_timing_compute(adev
, adev
->pio_mode
, &p
, T
, UT
);
1774 ata_timing_merge(&p
, t
, t
, ATA_TIMING_ALL
);
1778 * Lenghten active & recovery time so that cycle time is correct.
1781 if (t
->act8b
+ t
->rec8b
< t
->cyc8b
) {
1782 t
->act8b
+= (t
->cyc8b
- (t
->act8b
+ t
->rec8b
)) / 2;
1783 t
->rec8b
= t
->cyc8b
- t
->act8b
;
1786 if (t
->active
+ t
->recover
< t
->cycle
) {
1787 t
->active
+= (t
->cycle
- (t
->active
+ t
->recover
)) / 2;
1788 t
->recover
= t
->cycle
- t
->active
;
1794 static const struct {
1797 } xfer_mode_classes
[] = {
1798 { ATA_SHIFT_UDMA
, XFER_UDMA_0
},
1799 { ATA_SHIFT_MWDMA
, XFER_MW_DMA_0
},
1800 { ATA_SHIFT_PIO
, XFER_PIO_0
},
1803 static u8
base_from_shift(unsigned int shift
)
1807 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++)
1808 if (xfer_mode_classes
[i
].shift
== shift
)
1809 return xfer_mode_classes
[i
].base
;
1814 static void ata_dev_set_mode(struct ata_port
*ap
, struct ata_device
*dev
)
1819 if (!ata_dev_present(dev
) || (ap
->flags
& ATA_FLAG_PORT_DISABLED
))
1822 if (dev
->xfer_shift
== ATA_SHIFT_PIO
)
1823 dev
->flags
|= ATA_DFLAG_PIO
;
1825 ata_dev_set_xfermode(ap
, dev
);
1827 base
= base_from_shift(dev
->xfer_shift
);
1828 ofs
= dev
->xfer_mode
- base
;
1829 idx
= ofs
+ dev
->xfer_shift
;
1830 WARN_ON(idx
>= ARRAY_SIZE(xfer_mode_str
));
1832 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1833 idx
, dev
->xfer_shift
, (int)dev
->xfer_mode
, (int)base
, ofs
);
1835 printk(KERN_INFO
"ata%u: dev %u configured for %s\n",
1836 ap
->id
, dev
->devno
, xfer_mode_str
[idx
]);
1839 static int ata_host_set_pio(struct ata_port
*ap
)
1845 mask
= ata_get_mode_mask(ap
, ATA_SHIFT_PIO
);
1848 printk(KERN_WARNING
"ata%u: no PIO support\n", ap
->id
);
1852 base
= base_from_shift(ATA_SHIFT_PIO
);
1853 xfer_mode
= base
+ x
;
1855 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1856 (int)base
, (int)xfer_mode
, mask
, x
);
1858 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1859 struct ata_device
*dev
= &ap
->device
[i
];
1860 if (ata_dev_present(dev
)) {
1861 dev
->pio_mode
= xfer_mode
;
1862 dev
->xfer_mode
= xfer_mode
;
1863 dev
->xfer_shift
= ATA_SHIFT_PIO
;
1864 if (ap
->ops
->set_piomode
)
1865 ap
->ops
->set_piomode(ap
, dev
);
1872 static void ata_host_set_dma(struct ata_port
*ap
, u8 xfer_mode
,
1873 unsigned int xfer_shift
)
1877 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1878 struct ata_device
*dev
= &ap
->device
[i
];
1879 if (ata_dev_present(dev
)) {
1880 dev
->dma_mode
= xfer_mode
;
1881 dev
->xfer_mode
= xfer_mode
;
1882 dev
->xfer_shift
= xfer_shift
;
1883 if (ap
->ops
->set_dmamode
)
1884 ap
->ops
->set_dmamode(ap
, dev
);
1890 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1891 * @ap: port on which timings will be programmed
1893 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1896 * PCI/etc. bus probe sem.
1899 static void ata_set_mode(struct ata_port
*ap
)
1901 unsigned int xfer_shift
;
1905 /* step 1: always set host PIO timings */
1906 rc
= ata_host_set_pio(ap
);
1910 /* step 2: choose the best data xfer mode */
1911 xfer_mode
= xfer_shift
= 0;
1912 rc
= ata_choose_xfer_mode(ap
, &xfer_mode
, &xfer_shift
);
1916 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1917 if (xfer_shift
!= ATA_SHIFT_PIO
)
1918 ata_host_set_dma(ap
, xfer_mode
, xfer_shift
);
1920 /* step 4: update devices' xfer mode */
1921 ata_dev_set_mode(ap
, &ap
->device
[0]);
1922 ata_dev_set_mode(ap
, &ap
->device
[1]);
1924 if (ap
->flags
& ATA_FLAG_PORT_DISABLED
)
1927 if (ap
->ops
->post_set_mode
)
1928 ap
->ops
->post_set_mode(ap
);
1933 ata_port_disable(ap
);
1937 * ata_busy_sleep - sleep until BSY clears, or timeout
1938 * @ap: port containing status register to be polled
1939 * @tmout_pat: impatience timeout
1940 * @tmout: overall timeout
1942 * Sleep until ATA Status register bit BSY clears,
1943 * or a timeout occurs.
1949 static unsigned int ata_busy_sleep (struct ata_port
*ap
,
1950 unsigned long tmout_pat
,
1951 unsigned long tmout
)
1953 unsigned long timer_start
, timeout
;
1956 status
= ata_busy_wait(ap
, ATA_BUSY
, 300);
1957 timer_start
= jiffies
;
1958 timeout
= timer_start
+ tmout_pat
;
1959 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1961 status
= ata_busy_wait(ap
, ATA_BUSY
, 3);
1964 if (status
& ATA_BUSY
)
1965 printk(KERN_WARNING
"ata%u is slow to respond, "
1966 "please be patient\n", ap
->id
);
1968 timeout
= timer_start
+ tmout
;
1969 while ((status
& ATA_BUSY
) && (time_before(jiffies
, timeout
))) {
1971 status
= ata_chk_status(ap
);
1974 if (status
& ATA_BUSY
) {
1975 printk(KERN_ERR
"ata%u failed to respond (%lu secs)\n",
1976 ap
->id
, tmout
/ HZ
);
1983 static void ata_bus_post_reset(struct ata_port
*ap
, unsigned int devmask
)
1985 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
1986 unsigned int dev0
= devmask
& (1 << 0);
1987 unsigned int dev1
= devmask
& (1 << 1);
1988 unsigned long timeout
;
1990 /* if device 0 was found in ata_devchk, wait for its
1994 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
1996 /* if device 1 was found in ata_devchk, wait for
1997 * register access, then wait for BSY to clear
1999 timeout
= jiffies
+ ATA_TMOUT_BOOT
;
2003 ap
->ops
->dev_select(ap
, 1);
2004 if (ap
->flags
& ATA_FLAG_MMIO
) {
2005 nsect
= readb((void __iomem
*) ioaddr
->nsect_addr
);
2006 lbal
= readb((void __iomem
*) ioaddr
->lbal_addr
);
2008 nsect
= inb(ioaddr
->nsect_addr
);
2009 lbal
= inb(ioaddr
->lbal_addr
);
2011 if ((nsect
== 1) && (lbal
== 1))
2013 if (time_after(jiffies
, timeout
)) {
2017 msleep(50); /* give drive a breather */
2020 ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2022 /* is all this really necessary? */
2023 ap
->ops
->dev_select(ap
, 0);
2025 ap
->ops
->dev_select(ap
, 1);
2027 ap
->ops
->dev_select(ap
, 0);
2031 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
2032 * @ap: Port to reset and probe
2034 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
2035 * probe the bus. Not often used these days.
2038 * PCI/etc. bus probe sem.
2039 * Obtains host_set lock.
2043 static unsigned int ata_bus_edd(struct ata_port
*ap
)
2045 struct ata_taskfile tf
;
2046 unsigned long flags
;
2048 /* set up execute-device-diag (bus reset) taskfile */
2049 /* also, take interrupts to a known state (disabled) */
2050 DPRINTK("execute-device-diag\n");
2051 ata_tf_init(ap
, &tf
, 0);
2053 tf
.command
= ATA_CMD_EDD
;
2054 tf
.protocol
= ATA_PROT_NODATA
;
2057 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2058 ata_tf_to_host(ap
, &tf
);
2059 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2061 /* spec says at least 2ms. but who knows with those
2062 * crazy ATAPI devices...
2066 return ata_busy_sleep(ap
, ATA_TMOUT_BOOT_QUICK
, ATA_TMOUT_BOOT
);
2069 static unsigned int ata_bus_softreset(struct ata_port
*ap
,
2070 unsigned int devmask
)
2072 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2074 DPRINTK("ata%u: bus reset via SRST\n", ap
->id
);
2076 /* software reset. causes dev0 to be selected */
2077 if (ap
->flags
& ATA_FLAG_MMIO
) {
2078 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2079 udelay(20); /* FIXME: flush */
2080 writeb(ap
->ctl
| ATA_SRST
, (void __iomem
*) ioaddr
->ctl_addr
);
2081 udelay(20); /* FIXME: flush */
2082 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2084 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2086 outb(ap
->ctl
| ATA_SRST
, ioaddr
->ctl_addr
);
2088 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2091 /* spec mandates ">= 2ms" before checking status.
2092 * We wait 150ms, because that was the magic delay used for
2093 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
2094 * between when the ATA command register is written, and then
2095 * status is checked. Because waiting for "a while" before
2096 * checking status is fine, post SRST, we perform this magic
2097 * delay here as well.
2101 ata_bus_post_reset(ap
, devmask
);
2107 * ata_bus_reset - reset host port and associated ATA channel
2108 * @ap: port to reset
2110 * This is typically the first time we actually start issuing
2111 * commands to the ATA channel. We wait for BSY to clear, then
2112 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
2113 * result. Determine what devices, if any, are on the channel
2114 * by looking at the device 0/1 error register. Look at the signature
2115 * stored in each device's taskfile registers, to determine if
2116 * the device is ATA or ATAPI.
2119 * PCI/etc. bus probe sem.
2120 * Obtains host_set lock.
2123 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
2126 void ata_bus_reset(struct ata_port
*ap
)
2128 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
2129 unsigned int slave_possible
= ap
->flags
& ATA_FLAG_SLAVE_POSS
;
2131 unsigned int dev0
, dev1
= 0, rc
= 0, devmask
= 0;
2133 DPRINTK("ENTER, host %u, port %u\n", ap
->id
, ap
->port_no
);
2135 /* determine if device 0/1 are present */
2136 if (ap
->flags
& ATA_FLAG_SATA_RESET
)
2139 dev0
= ata_devchk(ap
, 0);
2141 dev1
= ata_devchk(ap
, 1);
2145 devmask
|= (1 << 0);
2147 devmask
|= (1 << 1);
2149 /* select device 0 again */
2150 ap
->ops
->dev_select(ap
, 0);
2152 /* issue bus reset */
2153 if (ap
->flags
& ATA_FLAG_SRST
)
2154 rc
= ata_bus_softreset(ap
, devmask
);
2155 else if ((ap
->flags
& ATA_FLAG_SATA_RESET
) == 0) {
2156 /* set up device control */
2157 if (ap
->flags
& ATA_FLAG_MMIO
)
2158 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2160 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2161 rc
= ata_bus_edd(ap
);
2168 * determine by signature whether we have ATA or ATAPI devices
2170 err
= ata_dev_try_classify(ap
, 0);
2171 if ((slave_possible
) && (err
!= 0x81))
2172 ata_dev_try_classify(ap
, 1);
2174 /* re-enable interrupts */
2175 if (ap
->ioaddr
.ctl_addr
) /* FIXME: hack. create a hook instead */
2178 /* is double-select really necessary? */
2179 if (ap
->device
[1].class != ATA_DEV_NONE
)
2180 ap
->ops
->dev_select(ap
, 1);
2181 if (ap
->device
[0].class != ATA_DEV_NONE
)
2182 ap
->ops
->dev_select(ap
, 0);
2184 /* if no devices were detected, disable this port */
2185 if ((ap
->device
[0].class == ATA_DEV_NONE
) &&
2186 (ap
->device
[1].class == ATA_DEV_NONE
))
2189 if (ap
->flags
& (ATA_FLAG_SATA_RESET
| ATA_FLAG_SRST
)) {
2190 /* set up device control for ATA_FLAG_SATA_RESET */
2191 if (ap
->flags
& ATA_FLAG_MMIO
)
2192 writeb(ap
->ctl
, (void __iomem
*) ioaddr
->ctl_addr
);
2194 outb(ap
->ctl
, ioaddr
->ctl_addr
);
2201 printk(KERN_ERR
"ata%u: disabling port\n", ap
->id
);
2202 ap
->ops
->port_disable(ap
);
2207 static void ata_pr_blacklisted(const struct ata_port
*ap
,
2208 const struct ata_device
*dev
)
2210 printk(KERN_WARNING
"ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2211 ap
->id
, dev
->devno
);
2214 static const char * const ata_dma_blacklist
[] = {
2233 "Toshiba CD-ROM XM-6202B",
2234 "TOSHIBA CD-ROM XM-1702BC",
2236 "E-IDE CD-ROM CR-840",
2239 "SAMSUNG CD-ROM SC-148C",
2240 "SAMSUNG CD-ROM SC",
2242 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2246 static int ata_dma_blacklisted(const struct ata_device
*dev
)
2248 unsigned char model_num
[40];
2253 ata_dev_id_string(dev
->id
, model_num
, ATA_ID_PROD_OFS
,
2256 len
= strnlen(s
, sizeof(model_num
));
2258 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2259 while ((len
> 0) && (s
[len
- 1] == ' ')) {
2264 for (i
= 0; i
< ARRAY_SIZE(ata_dma_blacklist
); i
++)
2265 if (!strncmp(ata_dma_blacklist
[i
], s
, len
))
2271 static unsigned int ata_get_mode_mask(const struct ata_port
*ap
, int shift
)
2273 const struct ata_device
*master
, *slave
;
2276 master
= &ap
->device
[0];
2277 slave
= &ap
->device
[1];
2279 assert (ata_dev_present(master
) || ata_dev_present(slave
));
2281 if (shift
== ATA_SHIFT_UDMA
) {
2282 mask
= ap
->udma_mask
;
2283 if (ata_dev_present(master
)) {
2284 mask
&= (master
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2285 if (ata_dma_blacklisted(master
)) {
2287 ata_pr_blacklisted(ap
, master
);
2290 if (ata_dev_present(slave
)) {
2291 mask
&= (slave
->id
[ATA_ID_UDMA_MODES
] & 0xff);
2292 if (ata_dma_blacklisted(slave
)) {
2294 ata_pr_blacklisted(ap
, slave
);
2298 else if (shift
== ATA_SHIFT_MWDMA
) {
2299 mask
= ap
->mwdma_mask
;
2300 if (ata_dev_present(master
)) {
2301 mask
&= (master
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2302 if (ata_dma_blacklisted(master
)) {
2304 ata_pr_blacklisted(ap
, master
);
2307 if (ata_dev_present(slave
)) {
2308 mask
&= (slave
->id
[ATA_ID_MWDMA_MODES
] & 0x07);
2309 if (ata_dma_blacklisted(slave
)) {
2311 ata_pr_blacklisted(ap
, slave
);
2315 else if (shift
== ATA_SHIFT_PIO
) {
2316 mask
= ap
->pio_mask
;
2317 if (ata_dev_present(master
)) {
2318 /* spec doesn't return explicit support for
2319 * PIO0-2, so we fake it
2321 u16 tmp_mode
= master
->id
[ATA_ID_PIO_MODES
] & 0x03;
2326 if (ata_dev_present(slave
)) {
2327 /* spec doesn't return explicit support for
2328 * PIO0-2, so we fake it
2330 u16 tmp_mode
= slave
->id
[ATA_ID_PIO_MODES
] & 0x03;
2337 mask
= 0xffffffff; /* shut up compiler warning */
2344 /* find greatest bit */
2345 static int fgb(u32 bitmap
)
2350 for (i
= 0; i
< 32; i
++)
2351 if (bitmap
& (1 << i
))
2358 * ata_choose_xfer_mode - attempt to find best transfer mode
2359 * @ap: Port for which an xfer mode will be selected
2360 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2361 * @xfer_shift_out: (output) bit shift that selects this mode
2363 * Based on host and device capabilities, determine the
2364 * maximum transfer mode that is amenable to all.
2367 * PCI/etc. bus probe sem.
2370 * Zero on success, negative on error.
2373 static int ata_choose_xfer_mode(const struct ata_port
*ap
,
2375 unsigned int *xfer_shift_out
)
2377 unsigned int mask
, shift
;
2380 for (i
= 0; i
< ARRAY_SIZE(xfer_mode_classes
); i
++) {
2381 shift
= xfer_mode_classes
[i
].shift
;
2382 mask
= ata_get_mode_mask(ap
, shift
);
2386 *xfer_mode_out
= xfer_mode_classes
[i
].base
+ x
;
2387 *xfer_shift_out
= shift
;
2396 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2397 * @ap: Port associated with device @dev
2398 * @dev: Device to which command will be sent
2400 * Issue SET FEATURES - XFER MODE command to device @dev
2404 * PCI/etc. bus probe sem.
2407 static void ata_dev_set_xfermode(struct ata_port
*ap
, struct ata_device
*dev
)
2409 struct ata_taskfile tf
;
2411 /* set up set-features taskfile */
2412 DPRINTK("set features - xfer mode\n");
2414 ata_tf_init(ap
, &tf
, dev
->devno
);
2415 tf
.command
= ATA_CMD_SET_FEATURES
;
2416 tf
.feature
= SETFEATURES_XFER
;
2417 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2418 tf
.protocol
= ATA_PROT_NODATA
;
2419 tf
.nsect
= dev
->xfer_mode
;
2421 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2422 printk(KERN_ERR
"ata%u: failed to set xfermode, disabled\n",
2424 ata_port_disable(ap
);
2431 * ata_dev_reread_id - Reread the device identify device info
2432 * @ap: port where the device is
2433 * @dev: device to reread the identify device info
2438 static void ata_dev_reread_id(struct ata_port
*ap
, struct ata_device
*dev
)
2440 struct ata_taskfile tf
;
2442 ata_tf_init(ap
, &tf
, dev
->devno
);
2444 if (dev
->class == ATA_DEV_ATA
) {
2445 tf
.command
= ATA_CMD_ID_ATA
;
2446 DPRINTK("do ATA identify\n");
2448 tf
.command
= ATA_CMD_ID_ATAPI
;
2449 DPRINTK("do ATAPI identify\n");
2452 tf
.flags
|= ATA_TFLAG_DEVICE
;
2453 tf
.protocol
= ATA_PROT_PIO
;
2455 if (ata_exec_internal(ap
, dev
, &tf
, DMA_FROM_DEVICE
,
2456 dev
->id
, sizeof(dev
->id
)))
2459 swap_buf_le16(dev
->id
, ATA_ID_WORDS
);
2467 printk(KERN_ERR
"ata%u: failed to reread ID, disabled\n", ap
->id
);
2468 ata_port_disable(ap
);
2472 * ata_dev_init_params - Issue INIT DEV PARAMS command
2473 * @ap: Port associated with device @dev
2474 * @dev: Device to which command will be sent
2479 static void ata_dev_init_params(struct ata_port
*ap
, struct ata_device
*dev
)
2481 struct ata_taskfile tf
;
2482 u16 sectors
= dev
->id
[6];
2483 u16 heads
= dev
->id
[3];
2485 /* Number of sectors per track 1-255. Number of heads 1-16 */
2486 if (sectors
< 1 || sectors
> 255 || heads
< 1 || heads
> 16)
2489 /* set up init dev params taskfile */
2490 DPRINTK("init dev params \n");
2492 ata_tf_init(ap
, &tf
, dev
->devno
);
2493 tf
.command
= ATA_CMD_INIT_DEV_PARAMS
;
2494 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2495 tf
.protocol
= ATA_PROT_NODATA
;
2497 tf
.device
|= (heads
- 1) & 0x0f; /* max head = num. of heads - 1 */
2499 if (ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0)) {
2500 printk(KERN_ERR
"ata%u: failed to init parameters, disabled\n",
2502 ata_port_disable(ap
);
2509 * ata_sg_clean - Unmap DMA memory associated with command
2510 * @qc: Command containing DMA memory to be released
2512 * Unmap all mapped DMA memory associated with this command.
2515 * spin_lock_irqsave(host_set lock)
2518 static void ata_sg_clean(struct ata_queued_cmd
*qc
)
2520 struct ata_port
*ap
= qc
->ap
;
2521 struct scatterlist
*sg
= qc
->__sg
;
2522 int dir
= qc
->dma_dir
;
2523 void *pad_buf
= NULL
;
2525 assert(qc
->flags
& ATA_QCFLAG_DMAMAP
);
2528 if (qc
->flags
& ATA_QCFLAG_SINGLE
)
2529 assert(qc
->n_elem
== 1);
2531 VPRINTK("unmapping %u sg elements\n", qc
->n_elem
);
2533 /* if we padded the buffer out to 32-bit bound, and data
2534 * xfer direction is from-device, we must copy from the
2535 * pad buffer back into the supplied buffer
2537 if (qc
->pad_len
&& !(qc
->tf
.flags
& ATA_TFLAG_WRITE
))
2538 pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2540 if (qc
->flags
& ATA_QCFLAG_SG
) {
2542 dma_unmap_sg(ap
->host_set
->dev
, sg
, qc
->n_elem
, dir
);
2543 /* restore last sg */
2544 sg
[qc
->orig_n_elem
- 1].length
+= qc
->pad_len
;
2546 struct scatterlist
*psg
= &qc
->pad_sgent
;
2547 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2548 memcpy(addr
+ psg
->offset
, pad_buf
, qc
->pad_len
);
2549 kunmap_atomic(addr
, KM_IRQ0
);
2552 if (sg_dma_len(&sg
[0]) > 0)
2553 dma_unmap_single(ap
->host_set
->dev
,
2554 sg_dma_address(&sg
[0]), sg_dma_len(&sg
[0]),
2557 sg
->length
+= qc
->pad_len
;
2559 memcpy(qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2560 pad_buf
, qc
->pad_len
);
2563 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
2568 * ata_fill_sg - Fill PCI IDE PRD table
2569 * @qc: Metadata associated with taskfile to be transferred
2571 * Fill PCI IDE PRD (scatter-gather) table with segments
2572 * associated with the current disk command.
2575 * spin_lock_irqsave(host_set lock)
2578 static void ata_fill_sg(struct ata_queued_cmd
*qc
)
2580 struct ata_port
*ap
= qc
->ap
;
2581 struct scatterlist
*sg
;
2584 assert(qc
->__sg
!= NULL
);
2585 assert(qc
->n_elem
> 0);
2588 ata_for_each_sg(sg
, qc
) {
2592 /* determine if physical DMA addr spans 64K boundary.
2593 * Note h/w doesn't support 64-bit, so we unconditionally
2594 * truncate dma_addr_t to u32.
2596 addr
= (u32
) sg_dma_address(sg
);
2597 sg_len
= sg_dma_len(sg
);
2600 offset
= addr
& 0xffff;
2602 if ((offset
+ sg_len
) > 0x10000)
2603 len
= 0x10000 - offset
;
2605 ap
->prd
[idx
].addr
= cpu_to_le32(addr
);
2606 ap
->prd
[idx
].flags_len
= cpu_to_le32(len
& 0xffff);
2607 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx
, addr
, len
);
2616 ap
->prd
[idx
- 1].flags_len
|= cpu_to_le32(ATA_PRD_EOT
);
2619 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2620 * @qc: Metadata associated with taskfile to check
2622 * Allow low-level driver to filter ATA PACKET commands, returning
2623 * a status indicating whether or not it is OK to use DMA for the
2624 * supplied PACKET command.
2627 * spin_lock_irqsave(host_set lock)
2629 * RETURNS: 0 when ATAPI DMA can be used
2632 int ata_check_atapi_dma(struct ata_queued_cmd
*qc
)
2634 struct ata_port
*ap
= qc
->ap
;
2635 int rc
= 0; /* Assume ATAPI DMA is OK by default */
2637 if (ap
->ops
->check_atapi_dma
)
2638 rc
= ap
->ops
->check_atapi_dma(qc
);
2643 * ata_qc_prep - Prepare taskfile for submission
2644 * @qc: Metadata associated with taskfile to be prepared
2646 * Prepare ATA taskfile for submission.
2649 * spin_lock_irqsave(host_set lock)
2651 void ata_qc_prep(struct ata_queued_cmd
*qc
)
2653 if (!(qc
->flags
& ATA_QCFLAG_DMAMAP
))
2660 * ata_sg_init_one - Associate command with memory buffer
2661 * @qc: Command to be associated
2662 * @buf: Memory buffer
2663 * @buflen: Length of memory buffer, in bytes.
2665 * Initialize the data-related elements of queued_cmd @qc
2666 * to point to a single memory buffer, @buf of byte length @buflen.
2669 * spin_lock_irqsave(host_set lock)
2672 void ata_sg_init_one(struct ata_queued_cmd
*qc
, void *buf
, unsigned int buflen
)
2674 struct scatterlist
*sg
;
2676 qc
->flags
|= ATA_QCFLAG_SINGLE
;
2678 memset(&qc
->sgent
, 0, sizeof(qc
->sgent
));
2679 qc
->__sg
= &qc
->sgent
;
2681 qc
->orig_n_elem
= 1;
2685 sg_init_one(sg
, buf
, buflen
);
2689 * ata_sg_init - Associate command with scatter-gather table.
2690 * @qc: Command to be associated
2691 * @sg: Scatter-gather table.
2692 * @n_elem: Number of elements in s/g table.
2694 * Initialize the data-related elements of queued_cmd @qc
2695 * to point to a scatter-gather table @sg, containing @n_elem
2699 * spin_lock_irqsave(host_set lock)
2702 void ata_sg_init(struct ata_queued_cmd
*qc
, struct scatterlist
*sg
,
2703 unsigned int n_elem
)
2705 qc
->flags
|= ATA_QCFLAG_SG
;
2707 qc
->n_elem
= n_elem
;
2708 qc
->orig_n_elem
= n_elem
;
2712 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2713 * @qc: Command with memory buffer to be mapped.
2715 * DMA-map the memory buffer associated with queued_cmd @qc.
2718 * spin_lock_irqsave(host_set lock)
2721 * Zero on success, negative on error.
2724 static int ata_sg_setup_one(struct ata_queued_cmd
*qc
)
2726 struct ata_port
*ap
= qc
->ap
;
2727 int dir
= qc
->dma_dir
;
2728 struct scatterlist
*sg
= qc
->__sg
;
2729 dma_addr_t dma_address
;
2731 /* we must lengthen transfers to end on a 32-bit boundary */
2732 qc
->pad_len
= sg
->length
& 3;
2734 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2735 struct scatterlist
*psg
= &qc
->pad_sgent
;
2737 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
2739 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2741 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
)
2742 memcpy(pad_buf
, qc
->buf_virt
+ sg
->length
- qc
->pad_len
,
2745 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2746 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2748 sg
->length
-= qc
->pad_len
;
2750 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2751 sg
->length
, qc
->pad_len
);
2755 sg_dma_address(sg
) = 0;
2759 dma_address
= dma_map_single(ap
->host_set
->dev
, qc
->buf_virt
,
2761 if (dma_mapping_error(dma_address
)) {
2763 sg
->length
+= qc
->pad_len
;
2767 sg_dma_address(sg
) = dma_address
;
2769 sg_dma_len(sg
) = sg
->length
;
2771 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg
),
2772 qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
2778 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2779 * @qc: Command with scatter-gather table to be mapped.
2781 * DMA-map the scatter-gather table associated with queued_cmd @qc.
2784 * spin_lock_irqsave(host_set lock)
2787 * Zero on success, negative on error.
2791 static int ata_sg_setup(struct ata_queued_cmd
*qc
)
2793 struct ata_port
*ap
= qc
->ap
;
2794 struct scatterlist
*sg
= qc
->__sg
;
2795 struct scatterlist
*lsg
= &sg
[qc
->n_elem
- 1];
2796 int n_elem
, pre_n_elem
, dir
, trim_sg
= 0;
2798 VPRINTK("ENTER, ata%u\n", ap
->id
);
2799 assert(qc
->flags
& ATA_QCFLAG_SG
);
2801 /* we must lengthen transfers to end on a 32-bit boundary */
2802 qc
->pad_len
= lsg
->length
& 3;
2804 void *pad_buf
= ap
->pad
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2805 struct scatterlist
*psg
= &qc
->pad_sgent
;
2806 unsigned int offset
;
2808 assert(qc
->dev
->class == ATA_DEV_ATAPI
);
2810 memset(pad_buf
, 0, ATA_DMA_PAD_SZ
);
2813 * psg->page/offset are used to copy to-be-written
2814 * data in this function or read data in ata_sg_clean.
2816 offset
= lsg
->offset
+ lsg
->length
- qc
->pad_len
;
2817 psg
->page
= nth_page(lsg
->page
, offset
>> PAGE_SHIFT
);
2818 psg
->offset
= offset_in_page(offset
);
2820 if (qc
->tf
.flags
& ATA_TFLAG_WRITE
) {
2821 void *addr
= kmap_atomic(psg
->page
, KM_IRQ0
);
2822 memcpy(pad_buf
, addr
+ psg
->offset
, qc
->pad_len
);
2823 kunmap_atomic(addr
, KM_IRQ0
);
2826 sg_dma_address(psg
) = ap
->pad_dma
+ (qc
->tag
* ATA_DMA_PAD_SZ
);
2827 sg_dma_len(psg
) = ATA_DMA_PAD_SZ
;
2829 lsg
->length
-= qc
->pad_len
;
2830 if (lsg
->length
== 0)
2833 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2834 qc
->n_elem
- 1, lsg
->length
, qc
->pad_len
);
2837 pre_n_elem
= qc
->n_elem
;
2838 if (trim_sg
&& pre_n_elem
)
2847 n_elem
= dma_map_sg(ap
->host_set
->dev
, sg
, pre_n_elem
, dir
);
2849 /* restore last sg */
2850 lsg
->length
+= qc
->pad_len
;
2854 DPRINTK("%d sg elements mapped\n", n_elem
);
2857 qc
->n_elem
= n_elem
;
2863 * ata_poll_qc_complete - turn irq back on and finish qc
2864 * @qc: Command to complete
2865 * @err_mask: ATA status register content
2868 * None. (grabs host lock)
2871 void ata_poll_qc_complete(struct ata_queued_cmd
*qc
)
2873 struct ata_port
*ap
= qc
->ap
;
2874 unsigned long flags
;
2876 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
2877 ap
->flags
&= ~ATA_FLAG_NOINTR
;
2879 ata_qc_complete(qc
);
2880 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
2885 * @ap: the target ata_port
2888 * None. (executing in kernel thread context)
2891 * timeout value to use
2894 static unsigned long ata_pio_poll(struct ata_port
*ap
)
2896 struct ata_queued_cmd
*qc
;
2898 unsigned int poll_state
= HSM_ST_UNKNOWN
;
2899 unsigned int reg_state
= HSM_ST_UNKNOWN
;
2901 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2904 switch (ap
->hsm_task_state
) {
2907 poll_state
= HSM_ST_POLL
;
2911 case HSM_ST_LAST_POLL
:
2912 poll_state
= HSM_ST_LAST_POLL
;
2913 reg_state
= HSM_ST_LAST
;
2920 status
= ata_chk_status(ap
);
2921 if (status
& ATA_BUSY
) {
2922 if (time_after(jiffies
, ap
->pio_task_timeout
)) {
2923 qc
->err_mask
|= AC_ERR_ATA_BUS
;
2924 ap
->hsm_task_state
= HSM_ST_TMOUT
;
2927 ap
->hsm_task_state
= poll_state
;
2928 return ATA_SHORT_PAUSE
;
2931 ap
->hsm_task_state
= reg_state
;
2936 * ata_pio_complete - check if drive is busy or idle
2937 * @ap: the target ata_port
2940 * None. (executing in kernel thread context)
2943 * Non-zero if qc completed, zero otherwise.
2946 static int ata_pio_complete (struct ata_port
*ap
)
2948 struct ata_queued_cmd
*qc
;
2952 * This is purely heuristic. This is a fast path. Sometimes when
2953 * we enter, BSY will be cleared in a chk-status or two. If not,
2954 * the drive is probably seeking or something. Snooze for a couple
2955 * msecs, then chk-status again. If still busy, fall back to
2956 * HSM_ST_POLL state.
2958 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
2959 if (drv_stat
& ATA_BUSY
) {
2961 drv_stat
= ata_busy_wait(ap
, ATA_BUSY
, 10);
2962 if (drv_stat
& ATA_BUSY
) {
2963 ap
->hsm_task_state
= HSM_ST_LAST_POLL
;
2964 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
2969 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
2972 drv_stat
= ata_wait_idle(ap
);
2973 if (!ata_ok(drv_stat
)) {
2974 qc
->err_mask
|= __ac_err_mask(drv_stat
);
2975 ap
->hsm_task_state
= HSM_ST_ERR
;
2979 ap
->hsm_task_state
= HSM_ST_IDLE
;
2981 assert(qc
->err_mask
== 0);
2982 ata_poll_qc_complete(qc
);
2984 /* another command may start at this point */
2991 * swap_buf_le16 - swap halves of 16-words in place
2992 * @buf: Buffer to swap
2993 * @buf_words: Number of 16-bit words in buffer.
2995 * Swap halves of 16-bit words if needed to convert from
2996 * little-endian byte order to native cpu byte order, or
3000 * Inherited from caller.
3002 void swap_buf_le16(u16
*buf
, unsigned int buf_words
)
3007 for (i
= 0; i
< buf_words
; i
++)
3008 buf
[i
] = le16_to_cpu(buf
[i
]);
3009 #endif /* __BIG_ENDIAN */
3013 * ata_mmio_data_xfer - Transfer data by MMIO
3014 * @ap: port to read/write
3016 * @buflen: buffer length
3017 * @write_data: read/write
3019 * Transfer data from/to the device data register by MMIO.
3022 * Inherited from caller.
3025 static void ata_mmio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3026 unsigned int buflen
, int write_data
)
3029 unsigned int words
= buflen
>> 1;
3030 u16
*buf16
= (u16
*) buf
;
3031 void __iomem
*mmio
= (void __iomem
*)ap
->ioaddr
.data_addr
;
3033 /* Transfer multiple of 2 bytes */
3035 for (i
= 0; i
< words
; i
++)
3036 writew(le16_to_cpu(buf16
[i
]), mmio
);
3038 for (i
= 0; i
< words
; i
++)
3039 buf16
[i
] = cpu_to_le16(readw(mmio
));
3042 /* Transfer trailing 1 byte, if any. */
3043 if (unlikely(buflen
& 0x01)) {
3044 u16 align_buf
[1] = { 0 };
3045 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3048 memcpy(align_buf
, trailing_buf
, 1);
3049 writew(le16_to_cpu(align_buf
[0]), mmio
);
3051 align_buf
[0] = cpu_to_le16(readw(mmio
));
3052 memcpy(trailing_buf
, align_buf
, 1);
3058 * ata_pio_data_xfer - Transfer data by PIO
3059 * @ap: port to read/write
3061 * @buflen: buffer length
3062 * @write_data: read/write
3064 * Transfer data from/to the device data register by PIO.
3067 * Inherited from caller.
3070 static void ata_pio_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3071 unsigned int buflen
, int write_data
)
3073 unsigned int words
= buflen
>> 1;
3075 /* Transfer multiple of 2 bytes */
3077 outsw(ap
->ioaddr
.data_addr
, buf
, words
);
3079 insw(ap
->ioaddr
.data_addr
, buf
, words
);
3081 /* Transfer trailing 1 byte, if any. */
3082 if (unlikely(buflen
& 0x01)) {
3083 u16 align_buf
[1] = { 0 };
3084 unsigned char *trailing_buf
= buf
+ buflen
- 1;
3087 memcpy(align_buf
, trailing_buf
, 1);
3088 outw(le16_to_cpu(align_buf
[0]), ap
->ioaddr
.data_addr
);
3090 align_buf
[0] = cpu_to_le16(inw(ap
->ioaddr
.data_addr
));
3091 memcpy(trailing_buf
, align_buf
, 1);
3097 * ata_data_xfer - Transfer data from/to the data register.
3098 * @ap: port to read/write
3100 * @buflen: buffer length
3101 * @do_write: read/write
3103 * Transfer data from/to the device data register.
3106 * Inherited from caller.
3109 static void ata_data_xfer(struct ata_port
*ap
, unsigned char *buf
,
3110 unsigned int buflen
, int do_write
)
3112 /* Make the crap hardware pay the costs not the good stuff */
3113 if (unlikely(ap
->flags
& ATA_FLAG_IRQ_MASK
)) {
3114 unsigned long flags
;
3115 local_irq_save(flags
);
3116 if (ap
->flags
& ATA_FLAG_MMIO
)
3117 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3119 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3120 local_irq_restore(flags
);
3122 if (ap
->flags
& ATA_FLAG_MMIO
)
3123 ata_mmio_data_xfer(ap
, buf
, buflen
, do_write
);
3125 ata_pio_data_xfer(ap
, buf
, buflen
, do_write
);
3130 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3131 * @qc: Command on going
3133 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3136 * Inherited from caller.
3139 static void ata_pio_sector(struct ata_queued_cmd
*qc
)
3141 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3142 struct scatterlist
*sg
= qc
->__sg
;
3143 struct ata_port
*ap
= qc
->ap
;
3145 unsigned int offset
;
3148 if (qc
->cursect
== (qc
->nsect
- 1))
3149 ap
->hsm_task_state
= HSM_ST_LAST
;
3151 page
= sg
[qc
->cursg
].page
;
3152 offset
= sg
[qc
->cursg
].offset
+ qc
->cursg_ofs
* ATA_SECT_SIZE
;
3154 /* get the current page and offset */
3155 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3156 offset
%= PAGE_SIZE
;
3158 buf
= kmap(page
) + offset
;
3163 if ((qc
->cursg_ofs
* ATA_SECT_SIZE
) == (&sg
[qc
->cursg
])->length
) {
3168 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3170 /* do the actual data transfer */
3171 do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3172 ata_data_xfer(ap
, buf
, ATA_SECT_SIZE
, do_write
);
3178 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3179 * @qc: Command on going
3180 * @bytes: number of bytes
3182 * Transfer Transfer data from/to the ATAPI device.
3185 * Inherited from caller.
3189 static void __atapi_pio_bytes(struct ata_queued_cmd
*qc
, unsigned int bytes
)
3191 int do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3192 struct scatterlist
*sg
= qc
->__sg
;
3193 struct ata_port
*ap
= qc
->ap
;
3196 unsigned int offset
, count
;
3198 if (qc
->curbytes
+ bytes
>= qc
->nbytes
)
3199 ap
->hsm_task_state
= HSM_ST_LAST
;
3202 if (unlikely(qc
->cursg
>= qc
->n_elem
)) {
3204 * The end of qc->sg is reached and the device expects
3205 * more data to transfer. In order not to overrun qc->sg
3206 * and fulfill length specified in the byte count register,
3207 * - for read case, discard trailing data from the device
3208 * - for write case, padding zero data to the device
3210 u16 pad_buf
[1] = { 0 };
3211 unsigned int words
= bytes
>> 1;
3214 if (words
) /* warning if bytes > 1 */
3215 printk(KERN_WARNING
"ata%u: %u bytes trailing data\n",
3218 for (i
= 0; i
< words
; i
++)
3219 ata_data_xfer(ap
, (unsigned char*)pad_buf
, 2, do_write
);
3221 ap
->hsm_task_state
= HSM_ST_LAST
;
3225 sg
= &qc
->__sg
[qc
->cursg
];
3228 offset
= sg
->offset
+ qc
->cursg_ofs
;
3230 /* get the current page and offset */
3231 page
= nth_page(page
, (offset
>> PAGE_SHIFT
));
3232 offset
%= PAGE_SIZE
;
3234 /* don't overrun current sg */
3235 count
= min(sg
->length
- qc
->cursg_ofs
, bytes
);
3237 /* don't cross page boundaries */
3238 count
= min(count
, (unsigned int)PAGE_SIZE
- offset
);
3240 buf
= kmap(page
) + offset
;
3243 qc
->curbytes
+= count
;
3244 qc
->cursg_ofs
+= count
;
3246 if (qc
->cursg_ofs
== sg
->length
) {
3251 DPRINTK("data %s\n", qc
->tf
.flags
& ATA_TFLAG_WRITE
? "write" : "read");
3253 /* do the actual data transfer */
3254 ata_data_xfer(ap
, buf
, count
, do_write
);
3263 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3264 * @qc: Command on going
3266 * Transfer Transfer data from/to the ATAPI device.
3269 * Inherited from caller.
3272 static void atapi_pio_bytes(struct ata_queued_cmd
*qc
)
3274 struct ata_port
*ap
= qc
->ap
;
3275 struct ata_device
*dev
= qc
->dev
;
3276 unsigned int ireason
, bc_lo
, bc_hi
, bytes
;
3277 int i_write
, do_write
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
) ? 1 : 0;
3279 ap
->ops
->tf_read(ap
, &qc
->tf
);
3280 ireason
= qc
->tf
.nsect
;
3281 bc_lo
= qc
->tf
.lbam
;
3282 bc_hi
= qc
->tf
.lbah
;
3283 bytes
= (bc_hi
<< 8) | bc_lo
;
3285 /* shall be cleared to zero, indicating xfer of data */
3286 if (ireason
& (1 << 0))
3289 /* make sure transfer direction matches expected */
3290 i_write
= ((ireason
& (1 << 1)) == 0) ? 1 : 0;
3291 if (do_write
!= i_write
)
3294 __atapi_pio_bytes(qc
, bytes
);
3299 printk(KERN_INFO
"ata%u: dev %u: ATAPI check failed\n",
3300 ap
->id
, dev
->devno
);
3301 qc
->err_mask
|= AC_ERR_ATA_BUS
;
3302 ap
->hsm_task_state
= HSM_ST_ERR
;
3306 * ata_pio_block - start PIO on a block
3307 * @ap: the target ata_port
3310 * None. (executing in kernel thread context)
3313 static void ata_pio_block(struct ata_port
*ap
)
3315 struct ata_queued_cmd
*qc
;
3319 * This is purely heuristic. This is a fast path.
3320 * Sometimes when we enter, BSY will be cleared in
3321 * a chk-status or two. If not, the drive is probably seeking
3322 * or something. Snooze for a couple msecs, then
3323 * chk-status again. If still busy, fall back to
3324 * HSM_ST_POLL state.
3326 status
= ata_busy_wait(ap
, ATA_BUSY
, 5);
3327 if (status
& ATA_BUSY
) {
3329 status
= ata_busy_wait(ap
, ATA_BUSY
, 10);
3330 if (status
& ATA_BUSY
) {
3331 ap
->hsm_task_state
= HSM_ST_POLL
;
3332 ap
->pio_task_timeout
= jiffies
+ ATA_TMOUT_PIO
;
3337 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3341 if (status
& (ATA_ERR
| ATA_DF
)) {
3342 qc
->err_mask
|= AC_ERR_DEV
;
3343 ap
->hsm_task_state
= HSM_ST_ERR
;
3347 /* transfer data if any */
3348 if (is_atapi_taskfile(&qc
->tf
)) {
3349 /* DRQ=0 means no more data to transfer */
3350 if ((status
& ATA_DRQ
) == 0) {
3351 ap
->hsm_task_state
= HSM_ST_LAST
;
3355 atapi_pio_bytes(qc
);
3357 /* handle BSY=0, DRQ=0 as error */
3358 if ((status
& ATA_DRQ
) == 0) {
3359 qc
->err_mask
|= AC_ERR_ATA_BUS
;
3360 ap
->hsm_task_state
= HSM_ST_ERR
;
3368 static void ata_pio_error(struct ata_port
*ap
)
3370 struct ata_queued_cmd
*qc
;
3372 printk(KERN_WARNING
"ata%u: PIO error\n", ap
->id
);
3374 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3377 /* make sure qc->err_mask is available to
3378 * know what's wrong and recover
3380 assert(qc
->err_mask
);
3382 ap
->hsm_task_state
= HSM_ST_IDLE
;
3384 ata_poll_qc_complete(qc
);
3387 static void ata_pio_task(void *_data
)
3389 struct ata_port
*ap
= _data
;
3390 unsigned long timeout
;
3397 switch (ap
->hsm_task_state
) {
3406 qc_completed
= ata_pio_complete(ap
);
3410 case HSM_ST_LAST_POLL
:
3411 timeout
= ata_pio_poll(ap
);
3421 queue_delayed_work(ata_wq
, &ap
->pio_task
, timeout
);
3422 else if (!qc_completed
)
3427 * ata_qc_timeout - Handle timeout of queued command
3428 * @qc: Command that timed out
3430 * Some part of the kernel (currently, only the SCSI layer)
3431 * has noticed that the active command on port @ap has not
3432 * completed after a specified length of time. Handle this
3433 * condition by disabling DMA (if necessary) and completing
3434 * transactions, with error if necessary.
3436 * This also handles the case of the "lost interrupt", where
3437 * for some reason (possibly hardware bug, possibly driver bug)
3438 * an interrupt was not delivered to the driver, even though the
3439 * transaction completed successfully.
3442 * Inherited from SCSI layer (none, can sleep)
3445 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
3447 struct ata_port
*ap
= qc
->ap
;
3448 struct ata_host_set
*host_set
= ap
->host_set
;
3449 u8 host_stat
= 0, drv_stat
;
3450 unsigned long flags
;
3454 spin_lock_irqsave(&host_set
->lock
, flags
);
3456 /* hack alert! We cannot use the supplied completion
3457 * function from inside the ->eh_strategy_handler() thread.
3458 * libata is the only user of ->eh_strategy_handler() in
3459 * any kernel, so the default scsi_done() assumes it is
3460 * not being called from the SCSI EH.
3462 qc
->scsidone
= scsi_finish_command
;
3464 switch (qc
->tf
.protocol
) {
3467 case ATA_PROT_ATAPI_DMA
:
3468 host_stat
= ap
->ops
->bmdma_status(ap
);
3470 /* before we do anything else, clear DMA-Start bit */
3471 ap
->ops
->bmdma_stop(qc
);
3477 drv_stat
= ata_chk_status(ap
);
3479 /* ack bmdma irq events */
3480 ap
->ops
->irq_clear(ap
);
3482 printk(KERN_ERR
"ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3483 ap
->id
, qc
->tf
.command
, drv_stat
, host_stat
);
3485 /* complete taskfile transaction */
3486 qc
->err_mask
|= ac_err_mask(drv_stat
);
3487 ata_qc_complete(qc
);
3491 spin_unlock_irqrestore(&host_set
->lock
, flags
);
3497 * ata_eng_timeout - Handle timeout of queued command
3498 * @ap: Port on which timed-out command is active
3500 * Some part of the kernel (currently, only the SCSI layer)
3501 * has noticed that the active command on port @ap has not
3502 * completed after a specified length of time. Handle this
3503 * condition by disabling DMA (if necessary) and completing
3504 * transactions, with error if necessary.
3506 * This also handles the case of the "lost interrupt", where
3507 * for some reason (possibly hardware bug, possibly driver bug)
3508 * an interrupt was not delivered to the driver, even though the
3509 * transaction completed successfully.
3512 * Inherited from SCSI layer (none, can sleep)
3515 void ata_eng_timeout(struct ata_port
*ap
)
3517 struct ata_queued_cmd
*qc
;
3521 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
3525 printk(KERN_ERR
"ata%u: BUG: timeout without command\n",
3535 * ata_qc_new - Request an available ATA command, for queueing
3536 * @ap: Port associated with device @dev
3537 * @dev: Device from whom we request an available command structure
3543 static struct ata_queued_cmd
*ata_qc_new(struct ata_port
*ap
)
3545 struct ata_queued_cmd
*qc
= NULL
;
3548 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++)
3549 if (!test_and_set_bit(i
, &ap
->qactive
)) {
3550 qc
= ata_qc_from_tag(ap
, i
);
3561 * ata_qc_new_init - Request an available ATA command, and initialize it
3562 * @ap: Port associated with device @dev
3563 * @dev: Device from whom we request an available command structure
3569 struct ata_queued_cmd
*ata_qc_new_init(struct ata_port
*ap
,
3570 struct ata_device
*dev
)
3572 struct ata_queued_cmd
*qc
;
3574 qc
= ata_qc_new(ap
);
3587 * ata_qc_free - free unused ata_queued_cmd
3588 * @qc: Command to complete
3590 * Designed to free unused ata_queued_cmd object
3591 * in case something prevents using it.
3594 * spin_lock_irqsave(host_set lock)
3596 void ata_qc_free(struct ata_queued_cmd
*qc
)
3598 struct ata_port
*ap
= qc
->ap
;
3601 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3605 if (likely(ata_tag_valid(tag
))) {
3606 if (tag
== ap
->active_tag
)
3607 ap
->active_tag
= ATA_TAG_POISON
;
3608 qc
->tag
= ATA_TAG_POISON
;
3609 clear_bit(tag
, &ap
->qactive
);
3614 * ata_qc_complete - Complete an active ATA command
3615 * @qc: Command to complete
3616 * @err_mask: ATA Status register contents
3618 * Indicate to the mid and upper layers that an ATA
3619 * command has completed, with either an ok or not-ok status.
3622 * spin_lock_irqsave(host_set lock)
3625 void ata_qc_complete(struct ata_queued_cmd
*qc
)
3627 assert(qc
!= NULL
); /* ata_qc_from_tag _might_ return NULL */
3628 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
3630 if (likely(qc
->flags
& ATA_QCFLAG_DMAMAP
))
3633 /* atapi: mark qc as inactive to prevent the interrupt handler
3634 * from completing the command twice later, before the error handler
3635 * is called. (when rc != 0 and atapi request sense is needed)
3637 qc
->flags
&= ~ATA_QCFLAG_ACTIVE
;
3639 /* call completion callback */
3640 qc
->complete_fn(qc
);
3643 static inline int ata_should_dma_map(struct ata_queued_cmd
*qc
)
3645 struct ata_port
*ap
= qc
->ap
;
3647 switch (qc
->tf
.protocol
) {
3649 case ATA_PROT_ATAPI_DMA
:
3652 case ATA_PROT_ATAPI
:
3654 case ATA_PROT_PIO_MULT
:
3655 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
3668 * ata_qc_issue - issue taskfile to device
3669 * @qc: command to issue to device
3671 * Prepare an ATA command to submission to device.
3672 * This includes mapping the data into a DMA-able
3673 * area, filling in the S/G table, and finally
3674 * writing the taskfile to hardware, starting the command.
3677 * spin_lock_irqsave(host_set lock)
3680 * Zero on success, negative on error.
3683 int ata_qc_issue(struct ata_queued_cmd
*qc
)
3685 struct ata_port
*ap
= qc
->ap
;
3687 if (ata_should_dma_map(qc
)) {
3688 if (qc
->flags
& ATA_QCFLAG_SG
) {
3689 if (ata_sg_setup(qc
))
3691 } else if (qc
->flags
& ATA_QCFLAG_SINGLE
) {
3692 if (ata_sg_setup_one(qc
))
3696 qc
->flags
&= ~ATA_QCFLAG_DMAMAP
;
3699 ap
->ops
->qc_prep(qc
);
3701 qc
->ap
->active_tag
= qc
->tag
;
3702 qc
->flags
|= ATA_QCFLAG_ACTIVE
;
3704 return ap
->ops
->qc_issue(qc
);
3712 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3713 * @qc: command to issue to device
3715 * Using various libata functions and hooks, this function
3716 * starts an ATA command. ATA commands are grouped into
3717 * classes called "protocols", and issuing each type of protocol
3718 * is slightly different.
3720 * May be used as the qc_issue() entry in ata_port_operations.
3723 * spin_lock_irqsave(host_set lock)
3726 * Zero on success, negative on error.
3729 int ata_qc_issue_prot(struct ata_queued_cmd
*qc
)
3731 struct ata_port
*ap
= qc
->ap
;
3733 ata_dev_select(ap
, qc
->dev
->devno
, 1, 0);
3735 switch (qc
->tf
.protocol
) {
3736 case ATA_PROT_NODATA
:
3737 ata_tf_to_host(ap
, &qc
->tf
);
3741 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3742 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3743 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
3746 case ATA_PROT_PIO
: /* load tf registers, initiate polling pio */
3747 ata_qc_set_polling(qc
);
3748 ata_tf_to_host(ap
, &qc
->tf
);
3749 ap
->hsm_task_state
= HSM_ST
;
3750 queue_work(ata_wq
, &ap
->pio_task
);
3753 case ATA_PROT_ATAPI
:
3754 ata_qc_set_polling(qc
);
3755 ata_tf_to_host(ap
, &qc
->tf
);
3756 queue_work(ata_wq
, &ap
->packet_task
);
3759 case ATA_PROT_ATAPI_NODATA
:
3760 ap
->flags
|= ATA_FLAG_NOINTR
;
3761 ata_tf_to_host(ap
, &qc
->tf
);
3762 queue_work(ata_wq
, &ap
->packet_task
);
3765 case ATA_PROT_ATAPI_DMA
:
3766 ap
->flags
|= ATA_FLAG_NOINTR
;
3767 ap
->ops
->tf_load(ap
, &qc
->tf
); /* load tf registers */
3768 ap
->ops
->bmdma_setup(qc
); /* set up bmdma */
3769 queue_work(ata_wq
, &ap
->packet_task
);
3781 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
3782 * @qc: Info associated with this ATA transaction.
3785 * spin_lock_irqsave(host_set lock)
3788 static void ata_bmdma_setup_mmio (struct ata_queued_cmd
*qc
)
3790 struct ata_port
*ap
= qc
->ap
;
3791 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3793 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3795 /* load PRD table addr. */
3796 mb(); /* make sure PRD table writes are visible to controller */
3797 writel(ap
->prd_dma
, mmio
+ ATA_DMA_TABLE_OFS
);
3799 /* specify data direction, triple-check start bit is clear */
3800 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3801 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3803 dmactl
|= ATA_DMA_WR
;
3804 writeb(dmactl
, mmio
+ ATA_DMA_CMD
);
3806 /* issue r/w command */
3807 ap
->ops
->exec_command(ap
, &qc
->tf
);
3811 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
3812 * @qc: Info associated with this ATA transaction.
3815 * spin_lock_irqsave(host_set lock)
3818 static void ata_bmdma_start_mmio (struct ata_queued_cmd
*qc
)
3820 struct ata_port
*ap
= qc
->ap
;
3821 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3824 /* start host DMA transaction */
3825 dmactl
= readb(mmio
+ ATA_DMA_CMD
);
3826 writeb(dmactl
| ATA_DMA_START
, mmio
+ ATA_DMA_CMD
);
3828 /* Strictly, one may wish to issue a readb() here, to
3829 * flush the mmio write. However, control also passes
3830 * to the hardware at this point, and it will interrupt
3831 * us when we are to resume control. So, in effect,
3832 * we don't care when the mmio write flushes.
3833 * Further, a read of the DMA status register _immediately_
3834 * following the write may not be what certain flaky hardware
3835 * is expected, so I think it is best to not add a readb()
3836 * without first all the MMIO ATA cards/mobos.
3837 * Or maybe I'm just being paranoid.
3842 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3843 * @qc: Info associated with this ATA transaction.
3846 * spin_lock_irqsave(host_set lock)
3849 static void ata_bmdma_setup_pio (struct ata_queued_cmd
*qc
)
3851 struct ata_port
*ap
= qc
->ap
;
3852 unsigned int rw
= (qc
->tf
.flags
& ATA_TFLAG_WRITE
);
3855 /* load PRD table addr. */
3856 outl(ap
->prd_dma
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_TABLE_OFS
);
3858 /* specify data direction, triple-check start bit is clear */
3859 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3860 dmactl
&= ~(ATA_DMA_WR
| ATA_DMA_START
);
3862 dmactl
|= ATA_DMA_WR
;
3863 outb(dmactl
, ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3865 /* issue r/w command */
3866 ap
->ops
->exec_command(ap
, &qc
->tf
);
3870 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3871 * @qc: Info associated with this ATA transaction.
3874 * spin_lock_irqsave(host_set lock)
3877 static void ata_bmdma_start_pio (struct ata_queued_cmd
*qc
)
3879 struct ata_port
*ap
= qc
->ap
;
3882 /* start host DMA transaction */
3883 dmactl
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3884 outb(dmactl
| ATA_DMA_START
,
3885 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
3890 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3891 * @qc: Info associated with this ATA transaction.
3893 * Writes the ATA_DMA_START flag to the DMA command register.
3895 * May be used as the bmdma_start() entry in ata_port_operations.
3898 * spin_lock_irqsave(host_set lock)
3900 void ata_bmdma_start(struct ata_queued_cmd
*qc
)
3902 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3903 ata_bmdma_start_mmio(qc
);
3905 ata_bmdma_start_pio(qc
);
3910 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3911 * @qc: Info associated with this ATA transaction.
3913 * Writes address of PRD table to device's PRD Table Address
3914 * register, sets the DMA control register, and calls
3915 * ops->exec_command() to start the transfer.
3917 * May be used as the bmdma_setup() entry in ata_port_operations.
3920 * spin_lock_irqsave(host_set lock)
3922 void ata_bmdma_setup(struct ata_queued_cmd
*qc
)
3924 if (qc
->ap
->flags
& ATA_FLAG_MMIO
)
3925 ata_bmdma_setup_mmio(qc
);
3927 ata_bmdma_setup_pio(qc
);
3932 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
3933 * @ap: Port associated with this ATA transaction.
3935 * Clear interrupt and error flags in DMA status register.
3937 * May be used as the irq_clear() entry in ata_port_operations.
3940 * spin_lock_irqsave(host_set lock)
3943 void ata_bmdma_irq_clear(struct ata_port
*ap
)
3945 if (ap
->flags
& ATA_FLAG_MMIO
) {
3946 void __iomem
*mmio
= ((void __iomem
*) ap
->ioaddr
.bmdma_addr
) + ATA_DMA_STATUS
;
3947 writeb(readb(mmio
), mmio
);
3949 unsigned long addr
= ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
;
3950 outb(inb(addr
), addr
);
3957 * ata_bmdma_status - Read PCI IDE BMDMA status
3958 * @ap: Port associated with this ATA transaction.
3960 * Read and return BMDMA status register.
3962 * May be used as the bmdma_status() entry in ata_port_operations.
3965 * spin_lock_irqsave(host_set lock)
3968 u8
ata_bmdma_status(struct ata_port
*ap
)
3971 if (ap
->flags
& ATA_FLAG_MMIO
) {
3972 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3973 host_stat
= readb(mmio
+ ATA_DMA_STATUS
);
3975 host_stat
= inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_STATUS
);
3981 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
3982 * @qc: Command we are ending DMA for
3984 * Clears the ATA_DMA_START flag in the dma control register
3986 * May be used as the bmdma_stop() entry in ata_port_operations.
3989 * spin_lock_irqsave(host_set lock)
3992 void ata_bmdma_stop(struct ata_queued_cmd
*qc
)
3994 struct ata_port
*ap
= qc
->ap
;
3995 if (ap
->flags
& ATA_FLAG_MMIO
) {
3996 void __iomem
*mmio
= (void __iomem
*) ap
->ioaddr
.bmdma_addr
;
3998 /* clear start/stop bit */
3999 writeb(readb(mmio
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4000 mmio
+ ATA_DMA_CMD
);
4002 /* clear start/stop bit */
4003 outb(inb(ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
) & ~ATA_DMA_START
,
4004 ap
->ioaddr
.bmdma_addr
+ ATA_DMA_CMD
);
4007 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4008 ata_altstatus(ap
); /* dummy read */
4012 * ata_host_intr - Handle host interrupt for given (port, task)
4013 * @ap: Port on which interrupt arrived (possibly...)
4014 * @qc: Taskfile currently active in engine
4016 * Handle host interrupt for given queued command. Currently,
4017 * only DMA interrupts are handled. All other commands are
4018 * handled via polling with interrupts disabled (nIEN bit).
4021 * spin_lock_irqsave(host_set lock)
4024 * One if interrupt was handled, zero if not (shared irq).
4027 inline unsigned int ata_host_intr (struct ata_port
*ap
,
4028 struct ata_queued_cmd
*qc
)
4030 u8 status
, host_stat
;
4032 switch (qc
->tf
.protocol
) {
4035 case ATA_PROT_ATAPI_DMA
:
4036 case ATA_PROT_ATAPI
:
4037 /* check status of DMA engine */
4038 host_stat
= ap
->ops
->bmdma_status(ap
);
4039 VPRINTK("ata%u: host_stat 0x%X\n", ap
->id
, host_stat
);
4041 /* if it's not our irq... */
4042 if (!(host_stat
& ATA_DMA_INTR
))
4045 /* before we do anything else, clear DMA-Start bit */
4046 ap
->ops
->bmdma_stop(qc
);
4050 case ATA_PROT_ATAPI_NODATA
:
4051 case ATA_PROT_NODATA
:
4052 /* check altstatus */
4053 status
= ata_altstatus(ap
);
4054 if (status
& ATA_BUSY
)
4057 /* check main status, clearing INTRQ */
4058 status
= ata_chk_status(ap
);
4059 if (unlikely(status
& ATA_BUSY
))
4061 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4062 ap
->id
, qc
->tf
.protocol
, status
);
4064 /* ack bmdma irq events */
4065 ap
->ops
->irq_clear(ap
);
4067 /* complete taskfile transaction */
4068 qc
->err_mask
|= ac_err_mask(status
);
4069 ata_qc_complete(qc
);
4076 return 1; /* irq handled */
4079 ap
->stats
.idle_irq
++;
4082 if ((ap
->stats
.idle_irq
% 1000) == 0) {
4084 ata_irq_ack(ap
, 0); /* debug trap */
4085 printk(KERN_WARNING
"ata%d: irq trap\n", ap
->id
);
4088 return 0; /* irq not handled */
4092 * ata_interrupt - Default ATA host interrupt handler
4093 * @irq: irq line (unused)
4094 * @dev_instance: pointer to our ata_host_set information structure
4097 * Default interrupt handler for PCI IDE devices. Calls
4098 * ata_host_intr() for each port that is not disabled.
4101 * Obtains host_set lock during operation.
4104 * IRQ_NONE or IRQ_HANDLED.
4107 irqreturn_t
ata_interrupt (int irq
, void *dev_instance
, struct pt_regs
*regs
)
4109 struct ata_host_set
*host_set
= dev_instance
;
4111 unsigned int handled
= 0;
4112 unsigned long flags
;
4114 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4115 spin_lock_irqsave(&host_set
->lock
, flags
);
4117 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4118 struct ata_port
*ap
;
4120 ap
= host_set
->ports
[i
];
4122 !(ap
->flags
& (ATA_FLAG_PORT_DISABLED
| ATA_FLAG_NOINTR
))) {
4123 struct ata_queued_cmd
*qc
;
4125 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4126 if (qc
&& (!(qc
->tf
.ctl
& ATA_NIEN
)) &&
4127 (qc
->flags
& ATA_QCFLAG_ACTIVE
))
4128 handled
|= ata_host_intr(ap
, qc
);
4132 spin_unlock_irqrestore(&host_set
->lock
, flags
);
4134 return IRQ_RETVAL(handled
);
4138 * atapi_packet_task - Write CDB bytes to hardware
4139 * @_data: Port to which ATAPI device is attached.
4141 * When device has indicated its readiness to accept
4142 * a CDB, this function is called. Send the CDB.
4143 * If DMA is to be performed, exit immediately.
4144 * Otherwise, we are in polling mode, so poll
4145 * status under operation succeeds or fails.
4148 * Kernel thread context (may sleep)
4151 static void atapi_packet_task(void *_data
)
4153 struct ata_port
*ap
= _data
;
4154 struct ata_queued_cmd
*qc
;
4157 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
4159 assert(qc
->flags
& ATA_QCFLAG_ACTIVE
);
4161 /* sleep-wait for BSY to clear */
4162 DPRINTK("busy wait\n");
4163 if (ata_busy_sleep(ap
, ATA_TMOUT_CDB_QUICK
, ATA_TMOUT_CDB
)) {
4164 qc
->err_mask
|= AC_ERR_ATA_BUS
;
4168 /* make sure DRQ is set */
4169 status
= ata_chk_status(ap
);
4170 if ((status
& (ATA_BUSY
| ATA_DRQ
)) != ATA_DRQ
) {
4171 qc
->err_mask
|= AC_ERR_ATA_BUS
;
4176 DPRINTK("send cdb\n");
4177 assert(ap
->cdb_len
>= 12);
4179 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
||
4180 qc
->tf
.protocol
== ATA_PROT_ATAPI_NODATA
) {
4181 unsigned long flags
;
4183 /* Once we're done issuing command and kicking bmdma,
4184 * irq handler takes over. To not lose irq, we need
4185 * to clear NOINTR flag before sending cdb, but
4186 * interrupt handler shouldn't be invoked before we're
4187 * finished. Hence, the following locking.
4189 spin_lock_irqsave(&ap
->host_set
->lock
, flags
);
4190 ap
->flags
&= ~ATA_FLAG_NOINTR
;
4191 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
4192 if (qc
->tf
.protocol
== ATA_PROT_ATAPI_DMA
)
4193 ap
->ops
->bmdma_start(qc
); /* initiate bmdma */
4194 spin_unlock_irqrestore(&ap
->host_set
->lock
, flags
);
4196 ata_data_xfer(ap
, qc
->cdb
, ap
->cdb_len
, 1);
4198 /* PIO commands are handled by polling */
4199 ap
->hsm_task_state
= HSM_ST
;
4200 queue_work(ata_wq
, &ap
->pio_task
);
4206 ata_poll_qc_complete(qc
);
4211 * ata_port_start - Set port up for dma.
4212 * @ap: Port to initialize
4214 * Called just after data structures for each port are
4215 * initialized. Allocates space for PRD table.
4217 * May be used as the port_start() entry in ata_port_operations.
4220 * Inherited from caller.
4224 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4225 * without filling any other registers
4227 static int ata_do_simple_cmd(struct ata_port
*ap
, struct ata_device
*dev
,
4230 struct ata_taskfile tf
;
4233 ata_tf_init(ap
, &tf
, dev
->devno
);
4236 tf
.flags
|= ATA_TFLAG_DEVICE
;
4237 tf
.protocol
= ATA_PROT_NODATA
;
4239 err
= ata_exec_internal(ap
, dev
, &tf
, DMA_NONE
, NULL
, 0);
4241 printk(KERN_ERR
"%s: ata command failed: %d\n",
4247 static int ata_flush_cache(struct ata_port
*ap
, struct ata_device
*dev
)
4251 if (!ata_try_flush_cache(dev
))
4254 if (ata_id_has_flush_ext(dev
->id
))
4255 cmd
= ATA_CMD_FLUSH_EXT
;
4257 cmd
= ATA_CMD_FLUSH
;
4259 return ata_do_simple_cmd(ap
, dev
, cmd
);
4262 static int ata_standby_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4264 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_STANDBYNOW1
);
4267 static int ata_start_drive(struct ata_port
*ap
, struct ata_device
*dev
)
4269 return ata_do_simple_cmd(ap
, dev
, ATA_CMD_IDLEIMMEDIATE
);
4273 * ata_device_resume - wakeup a previously suspended devices
4275 * Kick the drive back into action, by sending it an idle immediate
4276 * command and making sure its transfer mode matches between drive
4280 int ata_device_resume(struct ata_port
*ap
, struct ata_device
*dev
)
4282 if (ap
->flags
& ATA_FLAG_SUSPENDED
) {
4283 ap
->flags
&= ~ATA_FLAG_SUSPENDED
;
4286 if (!ata_dev_present(dev
))
4288 if (dev
->class == ATA_DEV_ATA
)
4289 ata_start_drive(ap
, dev
);
4295 * ata_device_suspend - prepare a device for suspend
4297 * Flush the cache on the drive, if appropriate, then issue a
4298 * standbynow command.
4301 int ata_device_suspend(struct ata_port
*ap
, struct ata_device
*dev
)
4303 if (!ata_dev_present(dev
))
4305 if (dev
->class == ATA_DEV_ATA
)
4306 ata_flush_cache(ap
, dev
);
4308 ata_standby_drive(ap
, dev
);
4309 ap
->flags
|= ATA_FLAG_SUSPENDED
;
4313 int ata_port_start (struct ata_port
*ap
)
4315 struct device
*dev
= ap
->host_set
->dev
;
4318 ap
->prd
= dma_alloc_coherent(dev
, ATA_PRD_TBL_SZ
, &ap
->prd_dma
, GFP_KERNEL
);
4322 rc
= ata_pad_alloc(ap
, dev
);
4324 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4328 DPRINTK("prd alloc, virt %p, dma %llx\n", ap
->prd
, (unsigned long long) ap
->prd_dma
);
4335 * ata_port_stop - Undo ata_port_start()
4336 * @ap: Port to shut down
4338 * Frees the PRD table.
4340 * May be used as the port_stop() entry in ata_port_operations.
4343 * Inherited from caller.
4346 void ata_port_stop (struct ata_port
*ap
)
4348 struct device
*dev
= ap
->host_set
->dev
;
4350 dma_free_coherent(dev
, ATA_PRD_TBL_SZ
, ap
->prd
, ap
->prd_dma
);
4351 ata_pad_free(ap
, dev
);
4354 void ata_host_stop (struct ata_host_set
*host_set
)
4356 if (host_set
->mmio_base
)
4357 iounmap(host_set
->mmio_base
);
4362 * ata_host_remove - Unregister SCSI host structure with upper layers
4363 * @ap: Port to unregister
4364 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4367 * Inherited from caller.
4370 static void ata_host_remove(struct ata_port
*ap
, unsigned int do_unregister
)
4372 struct Scsi_Host
*sh
= ap
->host
;
4377 scsi_remove_host(sh
);
4379 ap
->ops
->port_stop(ap
);
4383 * ata_host_init - Initialize an ata_port structure
4384 * @ap: Structure to initialize
4385 * @host: associated SCSI mid-layer structure
4386 * @host_set: Collection of hosts to which @ap belongs
4387 * @ent: Probe information provided by low-level driver
4388 * @port_no: Port number associated with this ata_port
4390 * Initialize a new ata_port structure, and its associated
4394 * Inherited from caller.
4397 static void ata_host_init(struct ata_port
*ap
, struct Scsi_Host
*host
,
4398 struct ata_host_set
*host_set
,
4399 const struct ata_probe_ent
*ent
, unsigned int port_no
)
4405 host
->max_channel
= 1;
4406 host
->unique_id
= ata_unique_id
++;
4407 host
->max_cmd_len
= 12;
4409 ap
->flags
= ATA_FLAG_PORT_DISABLED
;
4410 ap
->id
= host
->unique_id
;
4412 ap
->ctl
= ATA_DEVCTL_OBS
;
4413 ap
->host_set
= host_set
;
4414 ap
->port_no
= port_no
;
4416 ent
->legacy_mode
? ent
->hard_port_no
: port_no
;
4417 ap
->pio_mask
= ent
->pio_mask
;
4418 ap
->mwdma_mask
= ent
->mwdma_mask
;
4419 ap
->udma_mask
= ent
->udma_mask
;
4420 ap
->flags
|= ent
->host_flags
;
4421 ap
->ops
= ent
->port_ops
;
4422 ap
->cbl
= ATA_CBL_NONE
;
4423 ap
->active_tag
= ATA_TAG_POISON
;
4424 ap
->last_ctl
= 0xFF;
4426 INIT_WORK(&ap
->packet_task
, atapi_packet_task
, ap
);
4427 INIT_WORK(&ap
->pio_task
, ata_pio_task
, ap
);
4429 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
4430 ap
->device
[i
].devno
= i
;
4433 ap
->stats
.unhandled_irq
= 1;
4434 ap
->stats
.idle_irq
= 1;
4437 memcpy(&ap
->ioaddr
, &ent
->port
[port_no
], sizeof(struct ata_ioports
));
4441 * ata_host_add - Attach low-level ATA driver to system
4442 * @ent: Information provided by low-level driver
4443 * @host_set: Collections of ports to which we add
4444 * @port_no: Port number associated with this host
4446 * Attach low-level ATA driver to system.
4449 * PCI/etc. bus probe sem.
4452 * New ata_port on success, for NULL on error.
4455 static struct ata_port
* ata_host_add(const struct ata_probe_ent
*ent
,
4456 struct ata_host_set
*host_set
,
4457 unsigned int port_no
)
4459 struct Scsi_Host
*host
;
4460 struct ata_port
*ap
;
4464 host
= scsi_host_alloc(ent
->sht
, sizeof(struct ata_port
));
4468 ap
= (struct ata_port
*) &host
->hostdata
[0];
4470 ata_host_init(ap
, host
, host_set
, ent
, port_no
);
4472 rc
= ap
->ops
->port_start(ap
);
4479 scsi_host_put(host
);
4484 * ata_device_add - Register hardware device with ATA and SCSI layers
4485 * @ent: Probe information describing hardware device to be registered
4487 * This function processes the information provided in the probe
4488 * information struct @ent, allocates the necessary ATA and SCSI
4489 * host information structures, initializes them, and registers
4490 * everything with requisite kernel subsystems.
4492 * This function requests irqs, probes the ATA bus, and probes
4496 * PCI/etc. bus probe sem.
4499 * Number of ports registered. Zero on error (no ports registered).
4502 int ata_device_add(const struct ata_probe_ent
*ent
)
4504 unsigned int count
= 0, i
;
4505 struct device
*dev
= ent
->dev
;
4506 struct ata_host_set
*host_set
;
4509 /* alloc a container for our list of ATA ports (buses) */
4510 host_set
= kzalloc(sizeof(struct ata_host_set
) +
4511 (ent
->n_ports
* sizeof(void *)), GFP_KERNEL
);
4514 spin_lock_init(&host_set
->lock
);
4516 host_set
->dev
= dev
;
4517 host_set
->n_ports
= ent
->n_ports
;
4518 host_set
->irq
= ent
->irq
;
4519 host_set
->mmio_base
= ent
->mmio_base
;
4520 host_set
->private_data
= ent
->private_data
;
4521 host_set
->ops
= ent
->port_ops
;
4523 /* register each port bound to this device */
4524 for (i
= 0; i
< ent
->n_ports
; i
++) {
4525 struct ata_port
*ap
;
4526 unsigned long xfer_mode_mask
;
4528 ap
= ata_host_add(ent
, host_set
, i
);
4532 host_set
->ports
[i
] = ap
;
4533 xfer_mode_mask
=(ap
->udma_mask
<< ATA_SHIFT_UDMA
) |
4534 (ap
->mwdma_mask
<< ATA_SHIFT_MWDMA
) |
4535 (ap
->pio_mask
<< ATA_SHIFT_PIO
);
4537 /* print per-port info to dmesg */
4538 printk(KERN_INFO
"ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4539 "bmdma 0x%lX irq %lu\n",
4541 ap
->flags
& ATA_FLAG_SATA
? 'S' : 'P',
4542 ata_mode_string(xfer_mode_mask
),
4543 ap
->ioaddr
.cmd_addr
,
4544 ap
->ioaddr
.ctl_addr
,
4545 ap
->ioaddr
.bmdma_addr
,
4549 host_set
->ops
->irq_clear(ap
);
4556 /* obtain irq, that is shared between channels */
4557 if (request_irq(ent
->irq
, ent
->port_ops
->irq_handler
, ent
->irq_flags
,
4558 DRV_NAME
, host_set
))
4561 /* perform each probe synchronously */
4562 DPRINTK("probe begin\n");
4563 for (i
= 0; i
< count
; i
++) {
4564 struct ata_port
*ap
;
4567 ap
= host_set
->ports
[i
];
4569 DPRINTK("ata%u: probe begin\n", ap
->id
);
4570 rc
= ata_bus_probe(ap
);
4571 DPRINTK("ata%u: probe end\n", ap
->id
);
4574 /* FIXME: do something useful here?
4575 * Current libata behavior will
4576 * tear down everything when
4577 * the module is removed
4578 * or the h/w is unplugged.
4582 rc
= scsi_add_host(ap
->host
, dev
);
4584 printk(KERN_ERR
"ata%u: scsi_add_host failed\n",
4586 /* FIXME: do something useful here */
4587 /* FIXME: handle unconditional calls to
4588 * scsi_scan_host and ata_host_remove, below,
4594 /* probes are done, now scan each port's disk(s) */
4595 DPRINTK("probe begin\n");
4596 for (i
= 0; i
< count
; i
++) {
4597 struct ata_port
*ap
= host_set
->ports
[i
];
4599 ata_scsi_scan_host(ap
);
4602 dev_set_drvdata(dev
, host_set
);
4604 VPRINTK("EXIT, returning %u\n", ent
->n_ports
);
4605 return ent
->n_ports
; /* success */
4608 for (i
= 0; i
< count
; i
++) {
4609 ata_host_remove(host_set
->ports
[i
], 1);
4610 scsi_host_put(host_set
->ports
[i
]->host
);
4614 VPRINTK("EXIT, returning 0\n");
4619 * ata_host_set_remove - PCI layer callback for device removal
4620 * @host_set: ATA host set that was removed
4622 * Unregister all objects associated with this host set. Free those
4626 * Inherited from calling layer (may sleep).
4629 void ata_host_set_remove(struct ata_host_set
*host_set
)
4631 struct ata_port
*ap
;
4634 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4635 ap
= host_set
->ports
[i
];
4636 scsi_remove_host(ap
->host
);
4639 free_irq(host_set
->irq
, host_set
);
4641 for (i
= 0; i
< host_set
->n_ports
; i
++) {
4642 ap
= host_set
->ports
[i
];
4644 ata_scsi_release(ap
->host
);
4646 if ((ap
->flags
& ATA_FLAG_NO_LEGACY
) == 0) {
4647 struct ata_ioports
*ioaddr
= &ap
->ioaddr
;
4649 if (ioaddr
->cmd_addr
== 0x1f0)
4650 release_region(0x1f0, 8);
4651 else if (ioaddr
->cmd_addr
== 0x170)
4652 release_region(0x170, 8);
4655 scsi_host_put(ap
->host
);
4658 if (host_set
->ops
->host_stop
)
4659 host_set
->ops
->host_stop(host_set
);
4665 * ata_scsi_release - SCSI layer callback hook for host unload
4666 * @host: libata host to be unloaded
4668 * Performs all duties necessary to shut down a libata port...
4669 * Kill port kthread, disable port, and release resources.
4672 * Inherited from SCSI layer.
4678 int ata_scsi_release(struct Scsi_Host
*host
)
4680 struct ata_port
*ap
= (struct ata_port
*) &host
->hostdata
[0];
4684 ap
->ops
->port_disable(ap
);
4685 ata_host_remove(ap
, 0);
4692 * ata_std_ports - initialize ioaddr with standard port offsets.
4693 * @ioaddr: IO address structure to be initialized
4695 * Utility function which initializes data_addr, error_addr,
4696 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4697 * device_addr, status_addr, and command_addr to standard offsets
4698 * relative to cmd_addr.
4700 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
4703 void ata_std_ports(struct ata_ioports
*ioaddr
)
4705 ioaddr
->data_addr
= ioaddr
->cmd_addr
+ ATA_REG_DATA
;
4706 ioaddr
->error_addr
= ioaddr
->cmd_addr
+ ATA_REG_ERR
;
4707 ioaddr
->feature_addr
= ioaddr
->cmd_addr
+ ATA_REG_FEATURE
;
4708 ioaddr
->nsect_addr
= ioaddr
->cmd_addr
+ ATA_REG_NSECT
;
4709 ioaddr
->lbal_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAL
;
4710 ioaddr
->lbam_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAM
;
4711 ioaddr
->lbah_addr
= ioaddr
->cmd_addr
+ ATA_REG_LBAH
;
4712 ioaddr
->device_addr
= ioaddr
->cmd_addr
+ ATA_REG_DEVICE
;
4713 ioaddr
->status_addr
= ioaddr
->cmd_addr
+ ATA_REG_STATUS
;
4714 ioaddr
->command_addr
= ioaddr
->cmd_addr
+ ATA_REG_CMD
;
4717 static struct ata_probe_ent
*
4718 ata_probe_ent_alloc(struct device
*dev
, const struct ata_port_info
*port
)
4720 struct ata_probe_ent
*probe_ent
;
4722 probe_ent
= kzalloc(sizeof(*probe_ent
), GFP_KERNEL
);
4724 printk(KERN_ERR DRV_NAME
"(%s): out of memory\n",
4725 kobject_name(&(dev
->kobj
)));
4729 INIT_LIST_HEAD(&probe_ent
->node
);
4730 probe_ent
->dev
= dev
;
4732 probe_ent
->sht
= port
->sht
;
4733 probe_ent
->host_flags
= port
->host_flags
;
4734 probe_ent
->pio_mask
= port
->pio_mask
;
4735 probe_ent
->mwdma_mask
= port
->mwdma_mask
;
4736 probe_ent
->udma_mask
= port
->udma_mask
;
4737 probe_ent
->port_ops
= port
->port_ops
;
4746 void ata_pci_host_stop (struct ata_host_set
*host_set
)
4748 struct pci_dev
*pdev
= to_pci_dev(host_set
->dev
);
4750 pci_iounmap(pdev
, host_set
->mmio_base
);
4754 * ata_pci_init_native_mode - Initialize native-mode driver
4755 * @pdev: pci device to be initialized
4756 * @port: array[2] of pointers to port info structures.
4757 * @ports: bitmap of ports present
4759 * Utility function which allocates and initializes an
4760 * ata_probe_ent structure for a standard dual-port
4761 * PIO-based IDE controller. The returned ata_probe_ent
4762 * structure can be passed to ata_device_add(). The returned
4763 * ata_probe_ent structure should then be freed with kfree().
4765 * The caller need only pass the address of the primary port, the
4766 * secondary will be deduced automatically. If the device has non
4767 * standard secondary port mappings this function can be called twice,
4768 * once for each interface.
4771 struct ata_probe_ent
*
4772 ata_pci_init_native_mode(struct pci_dev
*pdev
, struct ata_port_info
**port
, int ports
)
4774 struct ata_probe_ent
*probe_ent
=
4775 ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
[0]);
4781 probe_ent
->irq
= pdev
->irq
;
4782 probe_ent
->irq_flags
= SA_SHIRQ
;
4783 probe_ent
->private_data
= port
[0]->private_data
;
4785 if (ports
& ATA_PORT_PRIMARY
) {
4786 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 0);
4787 probe_ent
->port
[p
].altstatus_addr
=
4788 probe_ent
->port
[p
].ctl_addr
=
4789 pci_resource_start(pdev
, 1) | ATA_PCI_CTL_OFS
;
4790 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4);
4791 ata_std_ports(&probe_ent
->port
[p
]);
4795 if (ports
& ATA_PORT_SECONDARY
) {
4796 probe_ent
->port
[p
].cmd_addr
= pci_resource_start(pdev
, 2);
4797 probe_ent
->port
[p
].altstatus_addr
=
4798 probe_ent
->port
[p
].ctl_addr
=
4799 pci_resource_start(pdev
, 3) | ATA_PCI_CTL_OFS
;
4800 probe_ent
->port
[p
].bmdma_addr
= pci_resource_start(pdev
, 4) + 8;
4801 ata_std_ports(&probe_ent
->port
[p
]);
4805 probe_ent
->n_ports
= p
;
4809 static struct ata_probe_ent
*ata_pci_init_legacy_port(struct pci_dev
*pdev
, struct ata_port_info
*port
, int port_num
)
4811 struct ata_probe_ent
*probe_ent
;
4813 probe_ent
= ata_probe_ent_alloc(pci_dev_to_dev(pdev
), port
);
4817 probe_ent
->legacy_mode
= 1;
4818 probe_ent
->n_ports
= 1;
4819 probe_ent
->hard_port_no
= port_num
;
4820 probe_ent
->private_data
= port
->private_data
;
4825 probe_ent
->irq
= 14;
4826 probe_ent
->port
[0].cmd_addr
= 0x1f0;
4827 probe_ent
->port
[0].altstatus_addr
=
4828 probe_ent
->port
[0].ctl_addr
= 0x3f6;
4831 probe_ent
->irq
= 15;
4832 probe_ent
->port
[0].cmd_addr
= 0x170;
4833 probe_ent
->port
[0].altstatus_addr
=
4834 probe_ent
->port
[0].ctl_addr
= 0x376;
4837 probe_ent
->port
[0].bmdma_addr
= pci_resource_start(pdev
, 4) + 8 * port_num
;
4838 ata_std_ports(&probe_ent
->port
[0]);
4843 * ata_pci_init_one - Initialize/register PCI IDE host controller
4844 * @pdev: Controller to be initialized
4845 * @port_info: Information from low-level host driver
4846 * @n_ports: Number of ports attached to host controller
4848 * This is a helper function which can be called from a driver's
4849 * xxx_init_one() probe function if the hardware uses traditional
4850 * IDE taskfile registers.
4852 * This function calls pci_enable_device(), reserves its register
4853 * regions, sets the dma mask, enables bus master mode, and calls
4857 * Inherited from PCI layer (may sleep).
4860 * Zero on success, negative on errno-based value on error.
4863 int ata_pci_init_one (struct pci_dev
*pdev
, struct ata_port_info
**port_info
,
4864 unsigned int n_ports
)
4866 struct ata_probe_ent
*probe_ent
= NULL
, *probe_ent2
= NULL
;
4867 struct ata_port_info
*port
[2];
4869 unsigned int legacy_mode
= 0;
4870 int disable_dev_on_err
= 1;
4875 port
[0] = port_info
[0];
4877 port
[1] = port_info
[1];
4881 if ((port
[0]->host_flags
& ATA_FLAG_NO_LEGACY
) == 0
4882 && (pdev
->class >> 8) == PCI_CLASS_STORAGE_IDE
) {
4883 /* TODO: What if one channel is in native mode ... */
4884 pci_read_config_byte(pdev
, PCI_CLASS_PROG
, &tmp8
);
4885 mask
= (1 << 2) | (1 << 0);
4886 if ((tmp8
& mask
) != mask
)
4887 legacy_mode
= (1 << 3);
4891 if ((!legacy_mode
) && (n_ports
> 2)) {
4892 printk(KERN_ERR
"ata: BUG: native mode, n_ports > 2\n");
4897 /* FIXME: Really for ATA it isn't safe because the device may be
4898 multi-purpose and we want to leave it alone if it was already
4899 enabled. Secondly for shared use as Arjan says we want refcounting
4901 Checking dev->is_enabled is insufficient as this is not set at
4902 boot for the primary video which is BIOS enabled
4905 rc
= pci_enable_device(pdev
);
4909 rc
= pci_request_regions(pdev
, DRV_NAME
);
4911 disable_dev_on_err
= 0;
4915 /* FIXME: Should use platform specific mappers for legacy port ranges */
4917 if (!request_region(0x1f0, 8, "libata")) {
4918 struct resource
*conflict
, res
;
4920 res
.end
= 0x1f0 + 8 - 1;
4921 conflict
= ____request_resource(&ioport_resource
, &res
);
4922 if (!strcmp(conflict
->name
, "libata"))
4923 legacy_mode
|= (1 << 0);
4925 disable_dev_on_err
= 0;
4926 printk(KERN_WARNING
"ata: 0x1f0 IDE port busy\n");
4929 legacy_mode
|= (1 << 0);
4931 if (!request_region(0x170, 8, "libata")) {
4932 struct resource
*conflict
, res
;
4934 res
.end
= 0x170 + 8 - 1;
4935 conflict
= ____request_resource(&ioport_resource
, &res
);
4936 if (!strcmp(conflict
->name
, "libata"))
4937 legacy_mode
|= (1 << 1);
4939 disable_dev_on_err
= 0;
4940 printk(KERN_WARNING
"ata: 0x170 IDE port busy\n");
4943 legacy_mode
|= (1 << 1);
4946 /* we have legacy mode, but all ports are unavailable */
4947 if (legacy_mode
== (1 << 3)) {
4949 goto err_out_regions
;
4952 rc
= pci_set_dma_mask(pdev
, ATA_DMA_MASK
);
4954 goto err_out_regions
;
4955 rc
= pci_set_consistent_dma_mask(pdev
, ATA_DMA_MASK
);
4957 goto err_out_regions
;
4960 if (legacy_mode
& (1 << 0))
4961 probe_ent
= ata_pci_init_legacy_port(pdev
, port
[0], 0);
4962 if (legacy_mode
& (1 << 1))
4963 probe_ent2
= ata_pci_init_legacy_port(pdev
, port
[1], 1);
4966 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
| ATA_PORT_SECONDARY
);
4968 probe_ent
= ata_pci_init_native_mode(pdev
, port
, ATA_PORT_PRIMARY
);
4970 if (!probe_ent
&& !probe_ent2
) {
4972 goto err_out_regions
;
4975 pci_set_master(pdev
);
4977 /* FIXME: check ata_device_add return */
4979 if (legacy_mode
& (1 << 0))
4980 ata_device_add(probe_ent
);
4981 if (legacy_mode
& (1 << 1))
4982 ata_device_add(probe_ent2
);
4984 ata_device_add(probe_ent
);
4992 if (legacy_mode
& (1 << 0))
4993 release_region(0x1f0, 8);
4994 if (legacy_mode
& (1 << 1))
4995 release_region(0x170, 8);
4996 pci_release_regions(pdev
);
4998 if (disable_dev_on_err
)
4999 pci_disable_device(pdev
);
5004 * ata_pci_remove_one - PCI layer callback for device removal
5005 * @pdev: PCI device that was removed
5007 * PCI layer indicates to libata via this hook that
5008 * hot-unplug or module unload event has occurred.
5009 * Handle this by unregistering all objects associated
5010 * with this PCI device. Free those objects. Then finally
5011 * release PCI resources and disable device.
5014 * Inherited from PCI layer (may sleep).
5017 void ata_pci_remove_one (struct pci_dev
*pdev
)
5019 struct device
*dev
= pci_dev_to_dev(pdev
);
5020 struct ata_host_set
*host_set
= dev_get_drvdata(dev
);
5022 ata_host_set_remove(host_set
);
5023 pci_release_regions(pdev
);
5024 pci_disable_device(pdev
);
5025 dev_set_drvdata(dev
, NULL
);
5028 /* move to PCI subsystem */
5029 int pci_test_config_bits(struct pci_dev
*pdev
, const struct pci_bits
*bits
)
5031 unsigned long tmp
= 0;
5033 switch (bits
->width
) {
5036 pci_read_config_byte(pdev
, bits
->reg
, &tmp8
);
5042 pci_read_config_word(pdev
, bits
->reg
, &tmp16
);
5048 pci_read_config_dword(pdev
, bits
->reg
, &tmp32
);
5059 return (tmp
== bits
->val
) ? 1 : 0;
5062 int ata_pci_device_suspend(struct pci_dev
*pdev
, pm_message_t state
)
5064 pci_save_state(pdev
);
5065 pci_disable_device(pdev
);
5066 pci_set_power_state(pdev
, PCI_D3hot
);
5070 int ata_pci_device_resume(struct pci_dev
*pdev
)
5072 pci_set_power_state(pdev
, PCI_D0
);
5073 pci_restore_state(pdev
);
5074 pci_enable_device(pdev
);
5075 pci_set_master(pdev
);
5078 #endif /* CONFIG_PCI */
5081 static int __init
ata_init(void)
5083 ata_wq
= create_workqueue("ata");
5087 printk(KERN_DEBUG
"libata version " DRV_VERSION
" loaded.\n");
5091 static void __exit
ata_exit(void)
5093 destroy_workqueue(ata_wq
);
5096 module_init(ata_init
);
5097 module_exit(ata_exit
);
5099 static unsigned long ratelimit_time
;
5100 static spinlock_t ata_ratelimit_lock
= SPIN_LOCK_UNLOCKED
;
5102 int ata_ratelimit(void)
5105 unsigned long flags
;
5107 spin_lock_irqsave(&ata_ratelimit_lock
, flags
);
5109 if (time_after(jiffies
, ratelimit_time
)) {
5111 ratelimit_time
= jiffies
+ (HZ
/5);
5115 spin_unlock_irqrestore(&ata_ratelimit_lock
, flags
);
5121 * libata is essentially a library of internal helper functions for
5122 * low-level ATA host controller drivers. As such, the API/ABI is
5123 * likely to change as new drivers are added and updated.
5124 * Do not depend on ABI/API stability.
5127 EXPORT_SYMBOL_GPL(ata_std_bios_param
);
5128 EXPORT_SYMBOL_GPL(ata_std_ports
);
5129 EXPORT_SYMBOL_GPL(ata_device_add
);
5130 EXPORT_SYMBOL_GPL(ata_host_set_remove
);
5131 EXPORT_SYMBOL_GPL(ata_sg_init
);
5132 EXPORT_SYMBOL_GPL(ata_sg_init_one
);
5133 EXPORT_SYMBOL_GPL(ata_qc_complete
);
5134 EXPORT_SYMBOL_GPL(ata_qc_issue_prot
);
5135 EXPORT_SYMBOL_GPL(ata_eng_timeout
);
5136 EXPORT_SYMBOL_GPL(ata_tf_load
);
5137 EXPORT_SYMBOL_GPL(ata_tf_read
);
5138 EXPORT_SYMBOL_GPL(ata_noop_dev_select
);
5139 EXPORT_SYMBOL_GPL(ata_std_dev_select
);
5140 EXPORT_SYMBOL_GPL(ata_tf_to_fis
);
5141 EXPORT_SYMBOL_GPL(ata_tf_from_fis
);
5142 EXPORT_SYMBOL_GPL(ata_check_status
);
5143 EXPORT_SYMBOL_GPL(ata_altstatus
);
5144 EXPORT_SYMBOL_GPL(ata_exec_command
);
5145 EXPORT_SYMBOL_GPL(ata_port_start
);
5146 EXPORT_SYMBOL_GPL(ata_port_stop
);
5147 EXPORT_SYMBOL_GPL(ata_host_stop
);
5148 EXPORT_SYMBOL_GPL(ata_interrupt
);
5149 EXPORT_SYMBOL_GPL(ata_qc_prep
);
5150 EXPORT_SYMBOL_GPL(ata_bmdma_setup
);
5151 EXPORT_SYMBOL_GPL(ata_bmdma_start
);
5152 EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear
);
5153 EXPORT_SYMBOL_GPL(ata_bmdma_status
);
5154 EXPORT_SYMBOL_GPL(ata_bmdma_stop
);
5155 EXPORT_SYMBOL_GPL(ata_port_probe
);
5156 EXPORT_SYMBOL_GPL(sata_phy_reset
);
5157 EXPORT_SYMBOL_GPL(__sata_phy_reset
);
5158 EXPORT_SYMBOL_GPL(ata_bus_reset
);
5159 EXPORT_SYMBOL_GPL(ata_port_disable
);
5160 EXPORT_SYMBOL_GPL(ata_ratelimit
);
5161 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
5162 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd
);
5163 EXPORT_SYMBOL_GPL(ata_scsi_error
);
5164 EXPORT_SYMBOL_GPL(ata_scsi_slave_config
);
5165 EXPORT_SYMBOL_GPL(ata_scsi_release
);
5166 EXPORT_SYMBOL_GPL(ata_host_intr
);
5167 EXPORT_SYMBOL_GPL(ata_dev_classify
);
5168 EXPORT_SYMBOL_GPL(ata_dev_id_string
);
5169 EXPORT_SYMBOL_GPL(ata_dev_config
);
5170 EXPORT_SYMBOL_GPL(ata_scsi_simulate
);
5172 EXPORT_SYMBOL_GPL(ata_pio_need_iordy
);
5173 EXPORT_SYMBOL_GPL(ata_timing_compute
);
5174 EXPORT_SYMBOL_GPL(ata_timing_merge
);
5177 EXPORT_SYMBOL_GPL(pci_test_config_bits
);
5178 EXPORT_SYMBOL_GPL(ata_pci_host_stop
);
5179 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode
);
5180 EXPORT_SYMBOL_GPL(ata_pci_init_one
);
5181 EXPORT_SYMBOL_GPL(ata_pci_remove_one
);
5182 EXPORT_SYMBOL_GPL(ata_pci_device_suspend
);
5183 EXPORT_SYMBOL_GPL(ata_pci_device_resume
);
5184 #endif /* CONFIG_PCI */
5186 EXPORT_SYMBOL_GPL(ata_device_suspend
);
5187 EXPORT_SYMBOL_GPL(ata_device_resume
);
5188 EXPORT_SYMBOL_GPL(ata_scsi_device_suspend
);
5189 EXPORT_SYMBOL_GPL(ata_scsi_device_resume
);