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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Jeff Garzikaf36d7f2005-08-28 20:18:39 -04002 * libata-core.c - helper library for ATA
3 *
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
6 * on emails.
7 *
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
10 *
11 *
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)
15 * any later version.
16 *
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.
21 *
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.
25 *
26 *
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
29 *
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
32 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 */
34
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>
41#include <linux/mm.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>
Jeff Garzik67846b32005-10-05 02:58:32 -040051#include <linux/jiffies.h>
David Hardeman378f0582005-09-17 17:55:31 +100052#include <linux/scatterlist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <scsi/scsi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include "scsi_priv.h"
Jeff Garzik193515d2005-11-07 00:59:37 -050055#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <scsi/scsi_host.h>
57#include <linux/libata.h>
58#include <asm/io.h>
59#include <asm/semaphore.h>
60#include <asm/byteorder.h>
61
62#include "libata.h"
63
Albert Lee59a10b12005-10-12 15:09:42 +080064static void ata_dev_reread_id(struct ata_port *ap, struct ata_device *dev);
Albert Lee8bf62ec2005-05-12 15:29:42 -040065static void ata_dev_init_params(struct ata_port *ap, struct ata_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066static void ata_set_mode(struct ata_port *ap);
67static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev);
Jeff Garzik057ace52005-10-22 14:27:05 -040068static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069static int fgb(u32 bitmap);
Jeff Garzik057ace52005-10-22 14:27:05 -040070static int ata_choose_xfer_mode(const struct ata_port *ap,
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 u8 *xfer_mode_out,
72 unsigned int *xfer_shift_out);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74static unsigned int ata_unique_id = 1;
75static struct workqueue_struct *ata_wq;
76
Jeff Garzik1623c812005-08-30 03:37:42 -040077int atapi_enabled = 0;
78module_param(atapi_enabled, int, 0444);
79MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081MODULE_AUTHOR("Jeff Garzik");
82MODULE_DESCRIPTION("Library module for ATA devices");
83MODULE_LICENSE("GPL");
84MODULE_VERSION(DRV_VERSION);
85
Edward Falk0baab862005-06-02 18:17:13 -040086
87/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
89 * @tf: Taskfile to convert
90 * @fis: Buffer into which data will output
91 * @pmp: Port multiplier port
92 *
93 * Converts a standard ATA taskfile to a Serial ATA
94 * FIS structure (Register - Host to Device).
95 *
96 * LOCKING:
97 * Inherited from caller.
98 */
99
Jeff Garzik057ace52005-10-22 14:27:05 -0400100void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
102 fis[0] = 0x27; /* Register - Host to Device FIS */
103 fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
104 bit 7 indicates Command FIS */
105 fis[2] = tf->command;
106 fis[3] = tf->feature;
107
108 fis[4] = tf->lbal;
109 fis[5] = tf->lbam;
110 fis[6] = tf->lbah;
111 fis[7] = tf->device;
112
113 fis[8] = tf->hob_lbal;
114 fis[9] = tf->hob_lbam;
115 fis[10] = tf->hob_lbah;
116 fis[11] = tf->hob_feature;
117
118 fis[12] = tf->nsect;
119 fis[13] = tf->hob_nsect;
120 fis[14] = 0;
121 fis[15] = tf->ctl;
122
123 fis[16] = 0;
124 fis[17] = 0;
125 fis[18] = 0;
126 fis[19] = 0;
127}
128
129/**
130 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
131 * @fis: Buffer from which data will be input
132 * @tf: Taskfile to output
133 *
Mark Lorde12a1be2005-11-12 18:55:45 -0500134 * Converts a serial ATA FIS structure to a standard ATA taskfile.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 *
136 * LOCKING:
137 * Inherited from caller.
138 */
139
Jeff Garzik057ace52005-10-22 14:27:05 -0400140void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
142 tf->command = fis[2]; /* status */
143 tf->feature = fis[3]; /* error */
144
145 tf->lbal = fis[4];
146 tf->lbam = fis[5];
147 tf->lbah = fis[6];
148 tf->device = fis[7];
149
150 tf->hob_lbal = fis[8];
151 tf->hob_lbam = fis[9];
152 tf->hob_lbah = fis[10];
153
154 tf->nsect = fis[12];
155 tf->hob_nsect = fis[13];
156}
157
Albert Lee8cbd6df2005-10-12 15:06:27 +0800158static const u8 ata_rw_cmds[] = {
159 /* pio multi */
160 ATA_CMD_READ_MULTI,
161 ATA_CMD_WRITE_MULTI,
162 ATA_CMD_READ_MULTI_EXT,
163 ATA_CMD_WRITE_MULTI_EXT,
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100164 0,
165 0,
166 0,
167 ATA_CMD_WRITE_MULTI_FUA_EXT,
Albert Lee8cbd6df2005-10-12 15:06:27 +0800168 /* pio */
169 ATA_CMD_PIO_READ,
170 ATA_CMD_PIO_WRITE,
171 ATA_CMD_PIO_READ_EXT,
172 ATA_CMD_PIO_WRITE_EXT,
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100173 0,
174 0,
175 0,
176 0,
Albert Lee8cbd6df2005-10-12 15:06:27 +0800177 /* dma */
178 ATA_CMD_READ,
179 ATA_CMD_WRITE,
180 ATA_CMD_READ_EXT,
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100181 ATA_CMD_WRITE_EXT,
182 0,
183 0,
184 0,
185 ATA_CMD_WRITE_FUA_EXT
Albert Lee8cbd6df2005-10-12 15:06:27 +0800186};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
188/**
Albert Lee8cbd6df2005-10-12 15:06:27 +0800189 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
190 * @qc: command to examine and configure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 *
Albert Lee8cbd6df2005-10-12 15:06:27 +0800192 * Examine the device configuration and tf->flags to calculate
193 * the proper read/write commands and protocol to use.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 *
195 * LOCKING:
196 * caller.
197 */
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100198int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199{
Albert Lee8cbd6df2005-10-12 15:06:27 +0800200 struct ata_taskfile *tf = &qc->tf;
201 struct ata_device *dev = qc->dev;
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100202 u8 cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100204 int index, fua, lba48, write;
Albert Lee8cbd6df2005-10-12 15:06:27 +0800205
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100206 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
Albert Lee8cbd6df2005-10-12 15:06:27 +0800207 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
208 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Albert Lee8cbd6df2005-10-12 15:06:27 +0800210 if (dev->flags & ATA_DFLAG_PIO) {
211 tf->protocol = ATA_PROT_PIO;
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100212 index = dev->multi_count ? 0 : 8;
Alan Cox8d238e02006-01-17 20:50:31 +0000213 } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
214 /* Unable to use DMA due to host limitation */
215 tf->protocol = ATA_PROT_PIO;
216 index = dev->multi_count ? 0 : 4;
Albert Lee8cbd6df2005-10-12 15:06:27 +0800217 } else {
218 tf->protocol = ATA_PROT_DMA;
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100219 index = 16;
Albert Lee8cbd6df2005-10-12 15:06:27 +0800220 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Tejun Heo9a3dccc2006-01-06 09:56:18 +0100222 cmd = ata_rw_cmds[index + fua + lba48 + write];
223 if (cmd) {
224 tf->command = cmd;
225 return 0;
226 }
227 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228}
229
Arjan van de Ven98ac62d2005-11-28 10:06:23 +0100230static const char * const xfer_mode_str[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 "UDMA/16",
232 "UDMA/25",
233 "UDMA/33",
234 "UDMA/44",
235 "UDMA/66",
236 "UDMA/100",
237 "UDMA/133",
238 "UDMA7",
239 "MWDMA0",
240 "MWDMA1",
241 "MWDMA2",
242 "PIO0",
243 "PIO1",
244 "PIO2",
245 "PIO3",
246 "PIO4",
247};
248
249/**
250 * ata_udma_string - convert UDMA bit offset to string
251 * @mask: mask of bits supported; only highest bit counts.
252 *
253 * Determine string which represents the highest speed
254 * (highest bit in @udma_mask).
255 *
256 * LOCKING:
257 * None.
258 *
259 * RETURNS:
260 * Constant C string representing highest speed listed in
261 * @udma_mask, or the constant C string "<n/a>".
262 */
263
264static const char *ata_mode_string(unsigned int mask)
265{
266 int i;
267
268 for (i = 7; i >= 0; i--)
269 if (mask & (1 << i))
270 goto out;
271 for (i = ATA_SHIFT_MWDMA + 2; i >= ATA_SHIFT_MWDMA; i--)
272 if (mask & (1 << i))
273 goto out;
274 for (i = ATA_SHIFT_PIO + 4; i >= ATA_SHIFT_PIO; i--)
275 if (mask & (1 << i))
276 goto out;
277
278 return "<n/a>";
279
280out:
281 return xfer_mode_str[i];
282}
283
284/**
285 * ata_pio_devchk - PATA device presence detection
286 * @ap: ATA channel to examine
287 * @device: Device to examine (starting at zero)
288 *
289 * This technique was originally described in
290 * Hale Landis's ATADRVR (www.ata-atapi.com), and
291 * later found its way into the ATA/ATAPI spec.
292 *
293 * Write a pattern to the ATA shadow registers,
294 * and if a device is present, it will respond by
295 * correctly storing and echoing back the
296 * ATA shadow register contents.
297 *
298 * LOCKING:
299 * caller.
300 */
301
302static unsigned int ata_pio_devchk(struct ata_port *ap,
303 unsigned int device)
304{
305 struct ata_ioports *ioaddr = &ap->ioaddr;
306 u8 nsect, lbal;
307
308 ap->ops->dev_select(ap, device);
309
310 outb(0x55, ioaddr->nsect_addr);
311 outb(0xaa, ioaddr->lbal_addr);
312
313 outb(0xaa, ioaddr->nsect_addr);
314 outb(0x55, ioaddr->lbal_addr);
315
316 outb(0x55, ioaddr->nsect_addr);
317 outb(0xaa, ioaddr->lbal_addr);
318
319 nsect = inb(ioaddr->nsect_addr);
320 lbal = inb(ioaddr->lbal_addr);
321
322 if ((nsect == 0x55) && (lbal == 0xaa))
323 return 1; /* we found a device */
324
325 return 0; /* nothing found */
326}
327
328/**
329 * ata_mmio_devchk - PATA device presence detection
330 * @ap: ATA channel to examine
331 * @device: Device to examine (starting at zero)
332 *
333 * This technique was originally described in
334 * Hale Landis's ATADRVR (www.ata-atapi.com), and
335 * later found its way into the ATA/ATAPI spec.
336 *
337 * Write a pattern to the ATA shadow registers,
338 * and if a device is present, it will respond by
339 * correctly storing and echoing back the
340 * ATA shadow register contents.
341 *
342 * LOCKING:
343 * caller.
344 */
345
346static unsigned int ata_mmio_devchk(struct ata_port *ap,
347 unsigned int device)
348{
349 struct ata_ioports *ioaddr = &ap->ioaddr;
350 u8 nsect, lbal;
351
352 ap->ops->dev_select(ap, device);
353
354 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
355 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
356
357 writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
358 writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
359
360 writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
361 writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
362
363 nsect = readb((void __iomem *) ioaddr->nsect_addr);
364 lbal = readb((void __iomem *) ioaddr->lbal_addr);
365
366 if ((nsect == 0x55) && (lbal == 0xaa))
367 return 1; /* we found a device */
368
369 return 0; /* nothing found */
370}
371
372/**
373 * ata_devchk - PATA device presence detection
374 * @ap: ATA channel to examine
375 * @device: Device to examine (starting at zero)
376 *
377 * Dispatch ATA device presence detection, depending
378 * on whether we are using PIO or MMIO to talk to the
379 * ATA shadow registers.
380 *
381 * LOCKING:
382 * caller.
383 */
384
385static unsigned int ata_devchk(struct ata_port *ap,
386 unsigned int device)
387{
388 if (ap->flags & ATA_FLAG_MMIO)
389 return ata_mmio_devchk(ap, device);
390 return ata_pio_devchk(ap, device);
391}
392
393/**
394 * ata_dev_classify - determine device type based on ATA-spec signature
395 * @tf: ATA taskfile register set for device to be identified
396 *
397 * Determine from taskfile register contents whether a device is
398 * ATA or ATAPI, as per "Signature and persistence" section
399 * of ATA/PI spec (volume 1, sect 5.14).
400 *
401 * LOCKING:
402 * None.
403 *
404 * RETURNS:
405 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
406 * the event of failure.
407 */
408
Jeff Garzik057ace52005-10-22 14:27:05 -0400409unsigned int ata_dev_classify(const struct ata_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
411 /* Apple's open source Darwin code hints that some devices only
412 * put a proper signature into the LBA mid/high registers,
413 * So, we only check those. It's sufficient for uniqueness.
414 */
415
416 if (((tf->lbam == 0) && (tf->lbah == 0)) ||
417 ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
418 DPRINTK("found ATA device by sig\n");
419 return ATA_DEV_ATA;
420 }
421
422 if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
423 ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
424 DPRINTK("found ATAPI device by sig\n");
425 return ATA_DEV_ATAPI;
426 }
427
428 DPRINTK("unknown device\n");
429 return ATA_DEV_UNKNOWN;
430}
431
432/**
433 * ata_dev_try_classify - Parse returned ATA device signature
434 * @ap: ATA channel to examine
435 * @device: Device to examine (starting at zero)
Tejun Heob4dc7622006-01-24 17:05:22 +0900436 * @r_err: Value of error register on completion
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 *
438 * After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
439 * an ATA/ATAPI-defined set of values is placed in the ATA
440 * shadow registers, indicating the results of device detection
441 * and diagnostics.
442 *
443 * Select the ATA device, and read the values from the ATA shadow
444 * registers. Then parse according to the Error register value,
445 * and the spec-defined values examined by ata_dev_classify().
446 *
447 * LOCKING:
448 * caller.
Tejun Heob4dc7622006-01-24 17:05:22 +0900449 *
450 * RETURNS:
451 * Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 */
453
Tejun Heob4dc7622006-01-24 17:05:22 +0900454static unsigned int
455ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 struct ata_taskfile tf;
458 unsigned int class;
459 u8 err;
460
461 ap->ops->dev_select(ap, device);
462
463 memset(&tf, 0, sizeof(tf));
464
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 ap->ops->tf_read(ap, &tf);
Jeff Garzik0169e282005-10-29 21:25:10 -0400466 err = tf.feature;
Tejun Heob4dc7622006-01-24 17:05:22 +0900467 if (r_err)
468 *r_err = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
470 /* see if device passed diags */
471 if (err == 1)
472 /* do nothing */ ;
473 else if ((device == 0) && (err == 0x81))
474 /* do nothing */ ;
475 else
Tejun Heob4dc7622006-01-24 17:05:22 +0900476 return ATA_DEV_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
Tejun Heob4dc7622006-01-24 17:05:22 +0900478 /* determine if device is ATA or ATAPI */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 class = ata_dev_classify(&tf);
Tejun Heob4dc7622006-01-24 17:05:22 +0900480
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 if (class == ATA_DEV_UNKNOWN)
Tejun Heob4dc7622006-01-24 17:05:22 +0900482 return ATA_DEV_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
Tejun Heob4dc7622006-01-24 17:05:22 +0900484 return ATA_DEV_NONE;
485 return class;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486}
487
488/**
489 * ata_dev_id_string - Convert IDENTIFY DEVICE page into string
490 * @id: IDENTIFY DEVICE results we will examine
491 * @s: string into which data is output
492 * @ofs: offset into identify device page
493 * @len: length of string to return. must be an even number.
494 *
495 * The strings in the IDENTIFY DEVICE page are broken up into
496 * 16-bit chunks. Run through the string, and output each
497 * 8-bit chunk linearly, regardless of platform.
498 *
499 * LOCKING:
500 * caller.
501 */
502
Jeff Garzik057ace52005-10-22 14:27:05 -0400503void ata_dev_id_string(const u16 *id, unsigned char *s,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 unsigned int ofs, unsigned int len)
505{
506 unsigned int c;
507
508 while (len > 0) {
509 c = id[ofs] >> 8;
510 *s = c;
511 s++;
512
513 c = id[ofs] & 0xff;
514 *s = c;
515 s++;
516
517 ofs++;
518 len -= 2;
519 }
520}
521
Edward Falk0baab862005-06-02 18:17:13 -0400522
523/**
524 * ata_noop_dev_select - Select device 0/1 on ATA bus
525 * @ap: ATA channel to manipulate
526 * @device: ATA device (numbered from zero) to select
527 *
528 * This function performs no actual function.
529 *
530 * May be used as the dev_select() entry in ata_port_operations.
531 *
532 * LOCKING:
533 * caller.
534 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
536{
537}
538
Edward Falk0baab862005-06-02 18:17:13 -0400539
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540/**
541 * ata_std_dev_select - Select device 0/1 on ATA bus
542 * @ap: ATA channel to manipulate
543 * @device: ATA device (numbered from zero) to select
544 *
545 * Use the method defined in the ATA specification to
546 * make either device 0, or device 1, active on the
Edward Falk0baab862005-06-02 18:17:13 -0400547 * ATA channel. Works with both PIO and MMIO.
548 *
549 * May be used as the dev_select() entry in ata_port_operations.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 *
551 * LOCKING:
552 * caller.
553 */
554
555void ata_std_dev_select (struct ata_port *ap, unsigned int device)
556{
557 u8 tmp;
558
559 if (device == 0)
560 tmp = ATA_DEVICE_OBS;
561 else
562 tmp = ATA_DEVICE_OBS | ATA_DEV1;
563
564 if (ap->flags & ATA_FLAG_MMIO) {
565 writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
566 } else {
567 outb(tmp, ap->ioaddr.device_addr);
568 }
569 ata_pause(ap); /* needed; also flushes, for mmio */
570}
571
572/**
573 * ata_dev_select - Select device 0/1 on ATA bus
574 * @ap: ATA channel to manipulate
575 * @device: ATA device (numbered from zero) to select
576 * @wait: non-zero to wait for Status register BSY bit to clear
577 * @can_sleep: non-zero if context allows sleeping
578 *
579 * Use the method defined in the ATA specification to
580 * make either device 0, or device 1, active on the
581 * ATA channel.
582 *
583 * This is a high-level version of ata_std_dev_select(),
584 * which additionally provides the services of inserting
585 * the proper pauses and status polling, where needed.
586 *
587 * LOCKING:
588 * caller.
589 */
590
591void ata_dev_select(struct ata_port *ap, unsigned int device,
592 unsigned int wait, unsigned int can_sleep)
593{
594 VPRINTK("ENTER, ata%u: device %u, wait %u\n",
595 ap->id, device, wait);
596
597 if (wait)
598 ata_wait_idle(ap);
599
600 ap->ops->dev_select(ap, device);
601
602 if (wait) {
603 if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
604 msleep(150);
605 ata_wait_idle(ap);
606 }
607}
608
609/**
610 * ata_dump_id - IDENTIFY DEVICE info debugging output
611 * @dev: Device whose IDENTIFY DEVICE page we will dump
612 *
613 * Dump selected 16-bit words from a detected device's
614 * IDENTIFY PAGE page.
615 *
616 * LOCKING:
617 * caller.
618 */
619
Jeff Garzik057ace52005-10-22 14:27:05 -0400620static inline void ata_dump_id(const struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621{
622 DPRINTK("49==0x%04x "
623 "53==0x%04x "
624 "63==0x%04x "
625 "64==0x%04x "
626 "75==0x%04x \n",
627 dev->id[49],
628 dev->id[53],
629 dev->id[63],
630 dev->id[64],
631 dev->id[75]);
632 DPRINTK("80==0x%04x "
633 "81==0x%04x "
634 "82==0x%04x "
635 "83==0x%04x "
636 "84==0x%04x \n",
637 dev->id[80],
638 dev->id[81],
639 dev->id[82],
640 dev->id[83],
641 dev->id[84]);
642 DPRINTK("88==0x%04x "
643 "93==0x%04x\n",
644 dev->id[88],
645 dev->id[93]);
646}
647
Alan Cox11e29e22005-10-21 18:46:32 -0400648/*
649 * Compute the PIO modes available for this device. This is not as
650 * trivial as it seems if we must consider early devices correctly.
651 *
652 * FIXME: pre IDE drive timing (do we care ?).
653 */
654
Jeff Garzik057ace52005-10-22 14:27:05 -0400655static unsigned int ata_pio_modes(const struct ata_device *adev)
Alan Cox11e29e22005-10-21 18:46:32 -0400656{
657 u16 modes;
658
Alan Coxffa29452006-01-09 17:14:40 +0000659 /* Usual case. Word 53 indicates word 64 is valid */
660 if (adev->id[ATA_ID_FIELD_VALID] & (1 << 1)) {
Alan Cox11e29e22005-10-21 18:46:32 -0400661 modes = adev->id[ATA_ID_PIO_MODES] & 0x03;
662 modes <<= 3;
663 modes |= 0x7;
664 return modes;
665 }
666
Alan Coxffa29452006-01-09 17:14:40 +0000667 /* If word 64 isn't valid then Word 51 high byte holds the PIO timing
668 number for the maximum. Turn it into a mask and return it */
669 modes = (2 << ((adev->id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF)) - 1 ;
Alan Cox11e29e22005-10-21 18:46:32 -0400670 return modes;
Alan Coxffa29452006-01-09 17:14:40 +0000671 /* But wait.. there's more. Design your standards by committee and
672 you too can get a free iordy field to process. However its the
673 speeds not the modes that are supported... Note drivers using the
674 timing API will get this right anyway */
Alan Cox11e29e22005-10-21 18:46:32 -0400675}
676
Tejun Heo95064372006-01-23 13:09:37 +0900677static inline void
678ata_queue_packet_task(struct ata_port *ap)
679{
Tejun Heoc18d06f2006-02-02 00:56:10 +0900680 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
681 queue_work(ata_wq, &ap->packet_task);
Tejun Heo95064372006-01-23 13:09:37 +0900682}
683
684static inline void
685ata_queue_pio_task(struct ata_port *ap)
686{
Tejun Heoc18d06f2006-02-02 00:56:10 +0900687 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
688 queue_work(ata_wq, &ap->pio_task);
Tejun Heo95064372006-01-23 13:09:37 +0900689}
690
691static inline void
692ata_queue_delayed_pio_task(struct ata_port *ap, unsigned long delay)
693{
Tejun Heoc18d06f2006-02-02 00:56:10 +0900694 if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
695 queue_delayed_work(ata_wq, &ap->pio_task, delay);
696}
697
698/**
699 * ata_flush_pio_tasks - Flush pio_task and packet_task
700 * @ap: the target ata_port
701 *
702 * After this function completes, pio_task and packet_task are
703 * guranteed not to be running or scheduled.
704 *
705 * LOCKING:
706 * Kernel thread context (may sleep)
707 */
708
709static void ata_flush_pio_tasks(struct ata_port *ap)
710{
711 int tmp = 0;
712 unsigned long flags;
713
714 DPRINTK("ENTER\n");
715
716 spin_lock_irqsave(&ap->host_set->lock, flags);
717 ap->flags |= ATA_FLAG_FLUSH_PIO_TASK;
718 spin_unlock_irqrestore(&ap->host_set->lock, flags);
719
720 DPRINTK("flush #1\n");
721 flush_workqueue(ata_wq);
722
723 /*
724 * At this point, if a task is running, it's guaranteed to see
725 * the FLUSH flag; thus, it will never queue pio tasks again.
726 * Cancel and flush.
727 */
728 tmp |= cancel_delayed_work(&ap->pio_task);
729 tmp |= cancel_delayed_work(&ap->packet_task);
730 if (!tmp) {
731 DPRINTK("flush #2\n");
732 flush_workqueue(ata_wq);
733 }
734
735 spin_lock_irqsave(&ap->host_set->lock, flags);
736 ap->flags &= ~ATA_FLAG_FLUSH_PIO_TASK;
737 spin_unlock_irqrestore(&ap->host_set->lock, flags);
738
739 DPRINTK("EXIT\n");
Tejun Heo95064372006-01-23 13:09:37 +0900740}
741
Tejun Heo77853bf2006-01-23 13:09:36 +0900742void ata_qc_complete_internal(struct ata_queued_cmd *qc)
Tejun Heoa2a7a662005-12-13 14:48:31 +0900743{
Tejun Heo77853bf2006-01-23 13:09:36 +0900744 struct completion *waiting = qc->private_data;
Tejun Heoa2a7a662005-12-13 14:48:31 +0900745
Tejun Heo77853bf2006-01-23 13:09:36 +0900746 qc->ap->ops->tf_read(qc->ap, &qc->tf);
Tejun Heoa2a7a662005-12-13 14:48:31 +0900747 complete(waiting);
Tejun Heoa2a7a662005-12-13 14:48:31 +0900748}
749
750/**
751 * ata_exec_internal - execute libata internal command
752 * @ap: Port to which the command is sent
753 * @dev: Device to which the command is sent
754 * @tf: Taskfile registers for the command and the result
755 * @dma_dir: Data tranfer direction of the command
756 * @buf: Data buffer of the command
757 * @buflen: Length of data buffer
758 *
759 * Executes libata internal command with timeout. @tf contains
760 * command on entry and result on return. Timeout and error
761 * conditions are reported via return value. No recovery action
762 * is taken after a command times out. It's caller's duty to
763 * clean up after timeout.
764 *
765 * LOCKING:
766 * None. Should be called with kernel context, might sleep.
767 */
768
769static unsigned
770ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
771 struct ata_taskfile *tf,
772 int dma_dir, void *buf, unsigned int buflen)
773{
774 u8 command = tf->command;
775 struct ata_queued_cmd *qc;
776 DECLARE_COMPLETION(wait);
777 unsigned long flags;
Tejun Heo77853bf2006-01-23 13:09:36 +0900778 unsigned int err_mask;
Tejun Heoa2a7a662005-12-13 14:48:31 +0900779
780 spin_lock_irqsave(&ap->host_set->lock, flags);
781
782 qc = ata_qc_new_init(ap, dev);
783 BUG_ON(qc == NULL);
784
785 qc->tf = *tf;
786 qc->dma_dir = dma_dir;
787 if (dma_dir != DMA_NONE) {
788 ata_sg_init_one(qc, buf, buflen);
789 qc->nsect = buflen / ATA_SECT_SIZE;
790 }
791
Tejun Heo77853bf2006-01-23 13:09:36 +0900792 qc->private_data = &wait;
Tejun Heoa2a7a662005-12-13 14:48:31 +0900793 qc->complete_fn = ata_qc_complete_internal;
794
Tejun Heo9a3d9eb2006-01-23 13:09:36 +0900795 qc->err_mask = ata_qc_issue(qc);
796 if (qc->err_mask)
Tejun Heo8e436af2006-01-23 13:09:36 +0900797 ata_qc_complete(qc);
Tejun Heoa2a7a662005-12-13 14:48:31 +0900798
799 spin_unlock_irqrestore(&ap->host_set->lock, flags);
800
801 if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
802 spin_lock_irqsave(&ap->host_set->lock, flags);
803
804 /* We're racing with irq here. If we lose, the
805 * following test prevents us from completing the qc
806 * again. If completion irq occurs after here but
807 * before the caller cleans up, it will result in a
808 * spurious interrupt. We can live with that.
809 */
Tejun Heo77853bf2006-01-23 13:09:36 +0900810 if (qc->flags & ATA_QCFLAG_ACTIVE) {
Tejun Heo11a56d22006-01-23 13:09:36 +0900811 qc->err_mask = AC_ERR_TIMEOUT;
Tejun Heoa2a7a662005-12-13 14:48:31 +0900812 ata_qc_complete(qc);
813 printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
814 ap->id, command);
815 }
816
817 spin_unlock_irqrestore(&ap->host_set->lock, flags);
818 }
819
Tejun Heo77853bf2006-01-23 13:09:36 +0900820 *tf = qc->tf;
821 err_mask = qc->err_mask;
822
823 ata_qc_free(qc);
824
825 return err_mask;
Tejun Heoa2a7a662005-12-13 14:48:31 +0900826}
827
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828/**
Alan Cox1bc4ccf2006-01-09 17:18:14 +0000829 * ata_pio_need_iordy - check if iordy needed
830 * @adev: ATA device
831 *
832 * Check if the current speed of the device requires IORDY. Used
833 * by various controllers for chip configuration.
834 */
835
836unsigned int ata_pio_need_iordy(const struct ata_device *adev)
837{
838 int pio;
839 int speed = adev->pio_mode - XFER_PIO_0;
840
841 if (speed < 2)
842 return 0;
843 if (speed > 2)
844 return 1;
845
846 /* If we have no drive specific rule, then PIO 2 is non IORDY */
847
848 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
849 pio = adev->id[ATA_ID_EIDE_PIO];
850 /* Is the speed faster than the drive allows non IORDY ? */
851 if (pio) {
852 /* This is cycle times not frequency - watch the logic! */
853 if (pio > 240) /* PIO2 is 240nS per cycle */
854 return 1;
855 return 0;
856 }
857 }
858 return 0;
859}
860
861/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 * ata_dev_identify - obtain IDENTIFY x DEVICE page
863 * @ap: port on which device we wish to probe resides
864 * @device: device bus address, starting at zero
865 *
866 * Following bus reset, we issue the IDENTIFY [PACKET] DEVICE
867 * command, and read back the 512-byte device information page.
868 * The device information page is fed to us via the standard
869 * PIO-IN protocol, but we hand-code it here. (TODO: investigate
870 * using standard PIO-IN paths)
871 *
872 * After reading the device information page, we use several
873 * bits of information from it to initialize data structures
874 * that will be used during the lifetime of the ata_device.
875 * Other data from the info page is used to disqualify certain
876 * older ATA devices we do not wish to support.
877 *
878 * LOCKING:
879 * Inherited from caller. Some functions called by this function
880 * obtain the host_set lock.
881 */
882
883static void ata_dev_identify(struct ata_port *ap, unsigned int device)
884{
885 struct ata_device *dev = &ap->device[device];
Albert Lee8bf62ec2005-05-12 15:29:42 -0400886 unsigned int major_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 u16 tmp;
888 unsigned long xfer_modes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 unsigned int using_edd;
Tejun Heoa0123702005-12-13 14:49:31 +0900890 struct ata_taskfile tf;
891 unsigned int err_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 int rc;
893
894 if (!ata_dev_present(dev)) {
895 DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
896 ap->id, device);
897 return;
898 }
899
900 if (ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
901 using_edd = 0;
902 else
903 using_edd = 1;
904
905 DPRINTK("ENTER, host %u, dev %u\n", ap->id, device);
906
907 assert (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ATAPI ||
908 dev->class == ATA_DEV_NONE);
909
910 ata_dev_select(ap, device, 1, 1); /* select device 0/1 */
911
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912retry:
Tejun Heoa0123702005-12-13 14:49:31 +0900913 ata_tf_init(ap, &tf, device);
914
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 if (dev->class == ATA_DEV_ATA) {
Tejun Heoa0123702005-12-13 14:49:31 +0900916 tf.command = ATA_CMD_ID_ATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 DPRINTK("do ATA identify\n");
918 } else {
Tejun Heoa0123702005-12-13 14:49:31 +0900919 tf.command = ATA_CMD_ID_ATAPI;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 DPRINTK("do ATAPI identify\n");
921 }
922
Tejun Heoa0123702005-12-13 14:49:31 +0900923 tf.protocol = ATA_PROT_PIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924
Tejun Heoa0123702005-12-13 14:49:31 +0900925 err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
926 dev->id, sizeof(dev->id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927
Tejun Heoa0123702005-12-13 14:49:31 +0900928 if (err_mask) {
929 if (err_mask & ~AC_ERR_DEV)
930 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 /*
933 * arg! EDD works for all test cases, but seems to return
934 * the ATA signature for some ATAPI devices. Until the
935 * reason for this is found and fixed, we fix up the mess
936 * here. If IDENTIFY DEVICE returns command aborted
937 * (as ATAPI devices do), then we issue an
938 * IDENTIFY PACKET DEVICE.
939 *
940 * ATA software reset (SRST, the default) does not appear
941 * to have this problem.
942 */
Albert Lee7c398332005-11-09 13:03:30 +0800943 if ((using_edd) && (dev->class == ATA_DEV_ATA)) {
Tejun Heoa0123702005-12-13 14:49:31 +0900944 u8 err = tf.feature;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 if (err & ATA_ABORTED) {
946 dev->class = ATA_DEV_ATAPI;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 goto retry;
948 }
949 }
950 goto err_out;
951 }
952
953 swap_buf_le16(dev->id, ATA_ID_WORDS);
954
955 /* print device capabilities */
956 printk(KERN_DEBUG "ata%u: dev %u cfg "
957 "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
958 ap->id, device, dev->id[49],
959 dev->id[82], dev->id[83], dev->id[84],
960 dev->id[85], dev->id[86], dev->id[87],
961 dev->id[88]);
962
963 /*
964 * common ATA, ATAPI feature tests
965 */
966
Albert Lee8bf62ec2005-05-12 15:29:42 -0400967 /* we require DMA support (bits 8 of word 49) */
968 if (!ata_id_has_dma(dev->id)) {
969 printk(KERN_DEBUG "ata%u: no dma\n", ap->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 goto err_out_nosup;
971 }
972
973 /* quick-n-dirty find max transfer mode; for printk only */
974 xfer_modes = dev->id[ATA_ID_UDMA_MODES];
975 if (!xfer_modes)
976 xfer_modes = (dev->id[ATA_ID_MWDMA_MODES]) << ATA_SHIFT_MWDMA;
Alan Cox11e29e22005-10-21 18:46:32 -0400977 if (!xfer_modes)
978 xfer_modes = ata_pio_modes(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979
980 ata_dump_id(dev);
981
982 /* ATA-specific feature tests */
983 if (dev->class == ATA_DEV_ATA) {
984 if (!ata_id_is_ata(dev->id)) /* sanity check */
985 goto err_out_nosup;
986
Albert Lee8bf62ec2005-05-12 15:29:42 -0400987 /* get major version */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 tmp = dev->id[ATA_ID_MAJOR_VER];
Albert Lee8bf62ec2005-05-12 15:29:42 -0400989 for (major_version = 14; major_version >= 1; major_version--)
990 if (tmp & (1 << major_version))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 break;
992
Albert Lee8bf62ec2005-05-12 15:29:42 -0400993 /*
994 * The exact sequence expected by certain pre-ATA4 drives is:
995 * SRST RESET
996 * IDENTIFY
997 * INITIALIZE DEVICE PARAMETERS
998 * anything else..
999 * Some drives were very specific about that exact sequence.
1000 */
Albert Lee59a10b12005-10-12 15:09:42 +08001001 if (major_version < 4 || (!ata_id_has_lba(dev->id))) {
Albert Lee8bf62ec2005-05-12 15:29:42 -04001002 ata_dev_init_params(ap, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003
Albert Lee59a10b12005-10-12 15:09:42 +08001004 /* current CHS translation info (id[53-58]) might be
1005 * changed. reread the identify device info.
1006 */
1007 ata_dev_reread_id(ap, dev);
1008 }
1009
Albert Lee8bf62ec2005-05-12 15:29:42 -04001010 if (ata_id_has_lba(dev->id)) {
1011 dev->flags |= ATA_DFLAG_LBA;
1012
1013 if (ata_id_has_lba48(dev->id)) {
1014 dev->flags |= ATA_DFLAG_LBA48;
1015 dev->n_sectors = ata_id_u64(dev->id, 100);
1016 } else {
1017 dev->n_sectors = ata_id_u32(dev->id, 60);
1018 }
1019
1020 /* print device info to dmesg */
1021 printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
1022 ap->id, device,
1023 major_version,
1024 ata_mode_string(xfer_modes),
1025 (unsigned long long)dev->n_sectors,
1026 dev->flags & ATA_DFLAG_LBA48 ? " LBA48" : " LBA");
1027 } else {
1028 /* CHS */
1029
1030 /* Default translation */
1031 dev->cylinders = dev->id[1];
1032 dev->heads = dev->id[3];
1033 dev->sectors = dev->id[6];
1034 dev->n_sectors = dev->cylinders * dev->heads * dev->sectors;
1035
1036 if (ata_id_current_chs_valid(dev->id)) {
1037 /* Current CHS translation is valid. */
1038 dev->cylinders = dev->id[54];
1039 dev->heads = dev->id[55];
1040 dev->sectors = dev->id[56];
1041
1042 dev->n_sectors = ata_id_u32(dev->id, 57);
1043 }
1044
1045 /* print device info to dmesg */
1046 printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
1047 ap->id, device,
1048 major_version,
1049 ata_mode_string(xfer_modes),
1050 (unsigned long long)dev->n_sectors,
1051 (int)dev->cylinders, (int)dev->heads, (int)dev->sectors);
1052
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 }
1054
1055 ap->host->max_cmd_len = 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 }
1057
1058 /* ATAPI-specific feature tests */
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05001059 else if (dev->class == ATA_DEV_ATAPI) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 if (ata_id_is_ata(dev->id)) /* sanity check */
1061 goto err_out_nosup;
1062
1063 rc = atapi_cdb_len(dev->id);
1064 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1065 printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1066 goto err_out_nosup;
1067 }
1068 ap->cdb_len = (unsigned int) rc;
1069 ap->host->max_cmd_len = (unsigned char) ap->cdb_len;
1070
1071 /* print device info to dmesg */
1072 printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
1073 ap->id, device,
1074 ata_mode_string(xfer_modes));
1075 }
1076
1077 DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1078 return;
1079
1080err_out_nosup:
1081 printk(KERN_WARNING "ata%u: dev %u not supported, ignoring\n",
1082 ap->id, device);
1083err_out:
1084 dev->class++; /* converts ATA_DEV_xxx into ATA_DEV_xxx_UNSUP */
1085 DPRINTK("EXIT, err\n");
1086}
1087
Brad Campbell6f2f3812005-05-12 15:07:47 -04001088
Jeff Garzik057ace52005-10-22 14:27:05 -04001089static inline u8 ata_dev_knobble(const struct ata_port *ap)
Brad Campbell6f2f3812005-05-12 15:07:47 -04001090{
1091 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(ap->device->id)));
1092}
1093
1094/**
Randy Dunlapc893a3a2006-01-28 13:15:32 -05001095 * ata_dev_config - Run device specific handlers & check for SATA->PATA bridges
1096 * @ap: Bus
1097 * @i: Device
Brad Campbell6f2f3812005-05-12 15:07:47 -04001098 *
Randy Dunlapc893a3a2006-01-28 13:15:32 -05001099 * LOCKING:
Brad Campbell6f2f3812005-05-12 15:07:47 -04001100 */
Jeff Garzik8a60a072005-07-31 13:13:24 -04001101
Brad Campbell6f2f3812005-05-12 15:07:47 -04001102void ata_dev_config(struct ata_port *ap, unsigned int i)
1103{
1104 /* limit bridge transfers to udma5, 200 sectors */
1105 if (ata_dev_knobble(ap)) {
1106 printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
1107 ap->id, ap->device->devno);
1108 ap->udma_mask &= ATA_UDMA5;
1109 ap->host->max_sectors = ATA_MAX_SECTORS;
1110 ap->host->hostt->max_sectors = ATA_MAX_SECTORS;
Alan Cox9d824d02006-01-17 20:51:55 +00001111 ap->device[i].flags |= ATA_DFLAG_LOCK_SECTORS;
Brad Campbell6f2f3812005-05-12 15:07:47 -04001112 }
1113
1114 if (ap->ops->dev_config)
1115 ap->ops->dev_config(ap, &ap->device[i]);
1116}
1117
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118/**
1119 * ata_bus_probe - Reset and probe ATA bus
1120 * @ap: Bus to probe
1121 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04001122 * Master ATA bus probing function. Initiates a hardware-dependent
1123 * bus reset, then attempts to identify any devices found on
1124 * the bus.
1125 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001127 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 *
1129 * RETURNS:
1130 * Zero on success, non-zero on error.
1131 */
1132
1133static int ata_bus_probe(struct ata_port *ap)
1134{
1135 unsigned int i, found = 0;
1136
Tejun Heoc19ba8a2006-01-24 17:05:22 +09001137 if (ap->ops->probe_reset) {
1138 unsigned int classes[ATA_MAX_DEVICES];
1139 int rc;
1140
1141 ata_port_probe(ap);
1142
1143 rc = ap->ops->probe_reset(ap, classes);
1144 if (rc == 0) {
1145 for (i = 0; i < ATA_MAX_DEVICES; i++)
1146 ap->device[i].class = classes[i];
1147 } else {
1148 printk(KERN_ERR "ata%u: probe reset failed, "
1149 "disabling port\n", ap->id);
1150 ata_port_disable(ap);
1151 }
1152 } else
1153 ap->ops->phy_reset(ap);
1154
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1156 goto err_out;
1157
1158 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1159 ata_dev_identify(ap, i);
1160 if (ata_dev_present(&ap->device[i])) {
1161 found = 1;
Brad Campbell6f2f3812005-05-12 15:07:47 -04001162 ata_dev_config(ap,i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 }
1164 }
1165
1166 if ((!found) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1167 goto err_out_disable;
1168
1169 ata_set_mode(ap);
1170 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1171 goto err_out_disable;
1172
1173 return 0;
1174
1175err_out_disable:
1176 ap->ops->port_disable(ap);
1177err_out:
1178 return -1;
1179}
1180
1181/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04001182 * ata_port_probe - Mark port as enabled
1183 * @ap: Port for which we indicate enablement
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04001185 * Modify @ap data structure such that the system
1186 * thinks that the entire port is enabled.
1187 *
1188 * LOCKING: host_set lock, or some other form of
1189 * serialization.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 */
1191
1192void ata_port_probe(struct ata_port *ap)
1193{
1194 ap->flags &= ~ATA_FLAG_PORT_DISABLED;
1195}
1196
1197/**
Tejun Heo3be680b2005-12-19 22:35:02 +09001198 * sata_print_link_status - Print SATA link status
1199 * @ap: SATA port to printk link status about
1200 *
1201 * This function prints link speed and status of a SATA link.
1202 *
1203 * LOCKING:
1204 * None.
1205 */
1206static void sata_print_link_status(struct ata_port *ap)
1207{
1208 u32 sstatus, tmp;
1209 const char *speed;
1210
1211 if (!ap->ops->scr_read)
1212 return;
1213
1214 sstatus = scr_read(ap, SCR_STATUS);
1215
1216 if (sata_dev_present(ap)) {
1217 tmp = (sstatus >> 4) & 0xf;
1218 if (tmp & (1 << 0))
1219 speed = "1.5";
1220 else if (tmp & (1 << 1))
1221 speed = "3.0";
1222 else
1223 speed = "<unknown>";
1224 printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
1225 ap->id, speed, sstatus);
1226 } else {
1227 printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
1228 ap->id, sstatus);
1229 }
1230}
1231
1232/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04001233 * __sata_phy_reset - Wake/reset a low-level SATA PHY
1234 * @ap: SATA port associated with target SATA PHY.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001236 * This function issues commands to standard SATA Sxxx
1237 * PHY registers, to wake up the phy (and device), and
1238 * clear any reset condition.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 *
1240 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001241 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 *
1243 */
1244void __sata_phy_reset(struct ata_port *ap)
1245{
1246 u32 sstatus;
1247 unsigned long timeout = jiffies + (HZ * 5);
1248
1249 if (ap->flags & ATA_FLAG_SATA_RESET) {
Brett Russcdcca892005-03-28 15:10:27 -05001250 /* issue phy wake/reset */
1251 scr_write_flush(ap, SCR_CONTROL, 0x301);
Tejun Heo62ba2842005-06-26 23:27:19 +09001252 /* Couldn't find anything in SATA I/II specs, but
1253 * AHCI-1.1 10.4.2 says at least 1 ms. */
1254 mdelay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 }
Brett Russcdcca892005-03-28 15:10:27 -05001256 scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257
1258 /* wait for phy to become ready, if necessary */
1259 do {
1260 msleep(200);
1261 sstatus = scr_read(ap, SCR_STATUS);
1262 if ((sstatus & 0xf) != 1)
1263 break;
1264 } while (time_before(jiffies, timeout));
1265
Tejun Heo3be680b2005-12-19 22:35:02 +09001266 /* print link status */
1267 sata_print_link_status(ap);
Jeff Garzik656563e2005-11-20 03:36:45 -05001268
Tejun Heo3be680b2005-12-19 22:35:02 +09001269 /* TODO: phy layer with polling, timeouts, etc. */
1270 if (sata_dev_present(ap))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 ata_port_probe(ap);
Tejun Heo3be680b2005-12-19 22:35:02 +09001272 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 ata_port_disable(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274
1275 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1276 return;
1277
1278 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
1279 ata_port_disable(ap);
1280 return;
1281 }
1282
1283 ap->cbl = ATA_CBL_SATA;
1284}
1285
1286/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04001287 * sata_phy_reset - Reset SATA bus.
1288 * @ap: SATA port associated with target SATA PHY.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001290 * This function resets the SATA bus, and then probes
1291 * the bus for devices.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 *
1293 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001294 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 *
1296 */
1297void sata_phy_reset(struct ata_port *ap)
1298{
1299 __sata_phy_reset(ap);
1300 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1301 return;
1302 ata_bus_reset(ap);
1303}
1304
1305/**
Jeff Garzik780a87f2005-05-30 15:41:05 -04001306 * ata_port_disable - Disable port.
1307 * @ap: Port to be disabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001309 * Modify @ap data structure such that the system
1310 * thinks that the entire port is disabled, and should
1311 * never attempt to probe or communicate with devices
1312 * on this port.
1313 *
1314 * LOCKING: host_set lock, or some other form of
1315 * serialization.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 */
1317
1318void ata_port_disable(struct ata_port *ap)
1319{
1320 ap->device[0].class = ATA_DEV_NONE;
1321 ap->device[1].class = ATA_DEV_NONE;
1322 ap->flags |= ATA_FLAG_PORT_DISABLED;
1323}
1324
Alan Cox452503f2005-10-21 19:01:32 -04001325/*
1326 * This mode timing computation functionality is ported over from
1327 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
1328 */
1329/*
1330 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
1331 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
1332 * for PIO 5, which is a nonstandard extension and UDMA6, which
1333 * is currently supported only by Maxtor drives.
1334 */
1335
1336static const struct ata_timing ata_timing[] = {
1337
1338 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 },
1339 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 },
1340 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 },
1341 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 },
1342
1343 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 },
1344 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 },
1345 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 },
1346
1347/* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */
1348
1349 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 },
1350 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 },
1351 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 },
1352
1353 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 },
1354 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 },
1355 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 },
1356
1357/* { XFER_PIO_5, 20, 50, 30, 100, 50, 30, 100, 0 }, */
1358 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 },
1359 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 },
1360
1361 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 },
1362 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 },
1363 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 },
1364
1365/* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */
1366
1367 { 0xFF }
1368};
1369
1370#define ENOUGH(v,unit) (((v)-1)/(unit)+1)
1371#define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
1372
1373static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
1374{
1375 q->setup = EZ(t->setup * 1000, T);
1376 q->act8b = EZ(t->act8b * 1000, T);
1377 q->rec8b = EZ(t->rec8b * 1000, T);
1378 q->cyc8b = EZ(t->cyc8b * 1000, T);
1379 q->active = EZ(t->active * 1000, T);
1380 q->recover = EZ(t->recover * 1000, T);
1381 q->cycle = EZ(t->cycle * 1000, T);
1382 q->udma = EZ(t->udma * 1000, UT);
1383}
1384
1385void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
1386 struct ata_timing *m, unsigned int what)
1387{
1388 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
1389 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
1390 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
1391 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
1392 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
1393 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
1394 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
1395 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
1396}
1397
1398static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
1399{
1400 const struct ata_timing *t;
1401
1402 for (t = ata_timing; t->mode != speed; t++)
Alan Cox91190752005-10-26 12:17:46 -04001403 if (t->mode == 0xFF)
Alan Cox452503f2005-10-21 19:01:32 -04001404 return NULL;
1405 return t;
1406}
1407
1408int ata_timing_compute(struct ata_device *adev, unsigned short speed,
1409 struct ata_timing *t, int T, int UT)
1410{
1411 const struct ata_timing *s;
1412 struct ata_timing p;
1413
1414 /*
1415 * Find the mode.
Albert Lee75b1f2f2005-11-16 17:06:18 +08001416 */
Alan Cox452503f2005-10-21 19:01:32 -04001417
1418 if (!(s = ata_timing_find_mode(speed)))
1419 return -EINVAL;
1420
Albert Lee75b1f2f2005-11-16 17:06:18 +08001421 memcpy(t, s, sizeof(*s));
1422
Alan Cox452503f2005-10-21 19:01:32 -04001423 /*
1424 * If the drive is an EIDE drive, it can tell us it needs extended
1425 * PIO/MW_DMA cycle timing.
1426 */
1427
1428 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
1429 memset(&p, 0, sizeof(p));
1430 if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
1431 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
1432 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
1433 } else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
1434 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
1435 }
1436 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
1437 }
1438
1439 /*
1440 * Convert the timing to bus clock counts.
1441 */
1442
Albert Lee75b1f2f2005-11-16 17:06:18 +08001443 ata_timing_quantize(t, t, T, UT);
Alan Cox452503f2005-10-21 19:01:32 -04001444
1445 /*
Randy Dunlapc893a3a2006-01-28 13:15:32 -05001446 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
1447 * S.M.A.R.T * and some other commands. We have to ensure that the
1448 * DMA cycle timing is slower/equal than the fastest PIO timing.
Alan Cox452503f2005-10-21 19:01:32 -04001449 */
1450
1451 if (speed > XFER_PIO_4) {
1452 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
1453 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
1454 }
1455
1456 /*
Randy Dunlapc893a3a2006-01-28 13:15:32 -05001457 * Lengthen active & recovery time so that cycle time is correct.
Alan Cox452503f2005-10-21 19:01:32 -04001458 */
1459
1460 if (t->act8b + t->rec8b < t->cyc8b) {
1461 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
1462 t->rec8b = t->cyc8b - t->act8b;
1463 }
1464
1465 if (t->active + t->recover < t->cycle) {
1466 t->active += (t->cycle - (t->active + t->recover)) / 2;
1467 t->recover = t->cycle - t->active;
1468 }
1469
1470 return 0;
1471}
1472
Jeff Garzik057ace52005-10-22 14:27:05 -04001473static const struct {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 unsigned int shift;
1475 u8 base;
1476} xfer_mode_classes[] = {
1477 { ATA_SHIFT_UDMA, XFER_UDMA_0 },
1478 { ATA_SHIFT_MWDMA, XFER_MW_DMA_0 },
1479 { ATA_SHIFT_PIO, XFER_PIO_0 },
1480};
1481
Arjan van de Ven858119e2006-01-14 13:20:43 -08001482static u8 base_from_shift(unsigned int shift)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483{
1484 int i;
1485
1486 for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++)
1487 if (xfer_mode_classes[i].shift == shift)
1488 return xfer_mode_classes[i].base;
1489
1490 return 0xff;
1491}
1492
1493static void ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
1494{
1495 int ofs, idx;
1496 u8 base;
1497
1498 if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
1499 return;
1500
1501 if (dev->xfer_shift == ATA_SHIFT_PIO)
1502 dev->flags |= ATA_DFLAG_PIO;
1503
1504 ata_dev_set_xfermode(ap, dev);
1505
1506 base = base_from_shift(dev->xfer_shift);
1507 ofs = dev->xfer_mode - base;
1508 idx = ofs + dev->xfer_shift;
1509 WARN_ON(idx >= ARRAY_SIZE(xfer_mode_str));
1510
1511 DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
1512 idx, dev->xfer_shift, (int)dev->xfer_mode, (int)base, ofs);
1513
1514 printk(KERN_INFO "ata%u: dev %u configured for %s\n",
1515 ap->id, dev->devno, xfer_mode_str[idx]);
1516}
1517
1518static int ata_host_set_pio(struct ata_port *ap)
1519{
1520 unsigned int mask;
1521 int x, i;
1522 u8 base, xfer_mode;
1523
1524 mask = ata_get_mode_mask(ap, ATA_SHIFT_PIO);
1525 x = fgb(mask);
1526 if (x < 0) {
1527 printk(KERN_WARNING "ata%u: no PIO support\n", ap->id);
1528 return -1;
1529 }
1530
1531 base = base_from_shift(ATA_SHIFT_PIO);
1532 xfer_mode = base + x;
1533
1534 DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
1535 (int)base, (int)xfer_mode, mask, x);
1536
1537 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1538 struct ata_device *dev = &ap->device[i];
1539 if (ata_dev_present(dev)) {
1540 dev->pio_mode = xfer_mode;
1541 dev->xfer_mode = xfer_mode;
1542 dev->xfer_shift = ATA_SHIFT_PIO;
1543 if (ap->ops->set_piomode)
1544 ap->ops->set_piomode(ap, dev);
1545 }
1546 }
1547
1548 return 0;
1549}
1550
1551static void ata_host_set_dma(struct ata_port *ap, u8 xfer_mode,
1552 unsigned int xfer_shift)
1553{
1554 int i;
1555
1556 for (i = 0; i < ATA_MAX_DEVICES; i++) {
1557 struct ata_device *dev = &ap->device[i];
1558 if (ata_dev_present(dev)) {
1559 dev->dma_mode = xfer_mode;
1560 dev->xfer_mode = xfer_mode;
1561 dev->xfer_shift = xfer_shift;
1562 if (ap->ops->set_dmamode)
1563 ap->ops->set_dmamode(ap, dev);
1564 }
1565 }
1566}
1567
1568/**
1569 * ata_set_mode - Program timings and issue SET FEATURES - XFER
1570 * @ap: port on which timings will be programmed
1571 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001572 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
1573 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001575 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 */
1577static void ata_set_mode(struct ata_port *ap)
1578{
Albert Lee8cbd6df2005-10-12 15:06:27 +08001579 unsigned int xfer_shift;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 u8 xfer_mode;
1581 int rc;
1582
1583 /* step 1: always set host PIO timings */
1584 rc = ata_host_set_pio(ap);
1585 if (rc)
1586 goto err_out;
1587
1588 /* step 2: choose the best data xfer mode */
1589 xfer_mode = xfer_shift = 0;
1590 rc = ata_choose_xfer_mode(ap, &xfer_mode, &xfer_shift);
1591 if (rc)
1592 goto err_out;
1593
1594 /* step 3: if that xfer mode isn't PIO, set host DMA timings */
1595 if (xfer_shift != ATA_SHIFT_PIO)
1596 ata_host_set_dma(ap, xfer_mode, xfer_shift);
1597
1598 /* step 4: update devices' xfer mode */
1599 ata_dev_set_mode(ap, &ap->device[0]);
1600 ata_dev_set_mode(ap, &ap->device[1]);
1601
1602 if (ap->flags & ATA_FLAG_PORT_DISABLED)
1603 return;
1604
1605 if (ap->ops->post_set_mode)
1606 ap->ops->post_set_mode(ap);
1607
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 return;
1609
1610err_out:
1611 ata_port_disable(ap);
1612}
1613
1614/**
Jeff Garzik1fdffbc2006-02-09 05:15:27 -05001615 * ata_tf_to_host - issue ATA taskfile to host controller
1616 * @ap: port to which command is being issued
1617 * @tf: ATA taskfile register set
1618 *
1619 * Issues ATA taskfile register set to ATA host controller,
1620 * with proper synchronization with interrupt handler and
1621 * other threads.
1622 *
1623 * LOCKING:
1624 * spin_lock_irqsave(host_set lock)
1625 */
1626
1627static inline void ata_tf_to_host(struct ata_port *ap,
1628 const struct ata_taskfile *tf)
1629{
1630 ap->ops->tf_load(ap, tf);
1631 ap->ops->exec_command(ap, tf);
1632}
1633
1634/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635 * ata_busy_sleep - sleep until BSY clears, or timeout
1636 * @ap: port containing status register to be polled
1637 * @tmout_pat: impatience timeout
1638 * @tmout: overall timeout
1639 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04001640 * Sleep until ATA Status register bit BSY clears,
1641 * or a timeout occurs.
1642 *
1643 * LOCKING: None.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644 */
1645
Tejun Heo6f8b9952006-01-24 17:05:21 +09001646unsigned int ata_busy_sleep (struct ata_port *ap,
1647 unsigned long tmout_pat, unsigned long tmout)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648{
1649 unsigned long timer_start, timeout;
1650 u8 status;
1651
1652 status = ata_busy_wait(ap, ATA_BUSY, 300);
1653 timer_start = jiffies;
1654 timeout = timer_start + tmout_pat;
1655 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1656 msleep(50);
1657 status = ata_busy_wait(ap, ATA_BUSY, 3);
1658 }
1659
1660 if (status & ATA_BUSY)
1661 printk(KERN_WARNING "ata%u is slow to respond, "
1662 "please be patient\n", ap->id);
1663
1664 timeout = timer_start + tmout;
1665 while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
1666 msleep(50);
1667 status = ata_chk_status(ap);
1668 }
1669
1670 if (status & ATA_BUSY) {
1671 printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
1672 ap->id, tmout / HZ);
1673 return 1;
1674 }
1675
1676 return 0;
1677}
1678
1679static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
1680{
1681 struct ata_ioports *ioaddr = &ap->ioaddr;
1682 unsigned int dev0 = devmask & (1 << 0);
1683 unsigned int dev1 = devmask & (1 << 1);
1684 unsigned long timeout;
1685
1686 /* if device 0 was found in ata_devchk, wait for its
1687 * BSY bit to clear
1688 */
1689 if (dev0)
1690 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1691
1692 /* if device 1 was found in ata_devchk, wait for
1693 * register access, then wait for BSY to clear
1694 */
1695 timeout = jiffies + ATA_TMOUT_BOOT;
1696 while (dev1) {
1697 u8 nsect, lbal;
1698
1699 ap->ops->dev_select(ap, 1);
1700 if (ap->flags & ATA_FLAG_MMIO) {
1701 nsect = readb((void __iomem *) ioaddr->nsect_addr);
1702 lbal = readb((void __iomem *) ioaddr->lbal_addr);
1703 } else {
1704 nsect = inb(ioaddr->nsect_addr);
1705 lbal = inb(ioaddr->lbal_addr);
1706 }
1707 if ((nsect == 1) && (lbal == 1))
1708 break;
1709 if (time_after(jiffies, timeout)) {
1710 dev1 = 0;
1711 break;
1712 }
1713 msleep(50); /* give drive a breather */
1714 }
1715 if (dev1)
1716 ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1717
1718 /* is all this really necessary? */
1719 ap->ops->dev_select(ap, 0);
1720 if (dev1)
1721 ap->ops->dev_select(ap, 1);
1722 if (dev0)
1723 ap->ops->dev_select(ap, 0);
1724}
1725
1726/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04001727 * ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
1728 * @ap: Port to reset and probe
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04001730 * Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
1731 * probe the bus. Not often used these days.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732 *
1733 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001734 * PCI/etc. bus probe sem.
Jeff Garzike5338252005-10-30 21:37:17 -05001735 * Obtains host_set lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736 *
1737 */
1738
1739static unsigned int ata_bus_edd(struct ata_port *ap)
1740{
1741 struct ata_taskfile tf;
Jeff Garzike5338252005-10-30 21:37:17 -05001742 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743
1744 /* set up execute-device-diag (bus reset) taskfile */
1745 /* also, take interrupts to a known state (disabled) */
1746 DPRINTK("execute-device-diag\n");
1747 ata_tf_init(ap, &tf, 0);
1748 tf.ctl |= ATA_NIEN;
1749 tf.command = ATA_CMD_EDD;
1750 tf.protocol = ATA_PROT_NODATA;
1751
1752 /* do bus reset */
Jeff Garzike5338252005-10-30 21:37:17 -05001753 spin_lock_irqsave(&ap->host_set->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 ata_tf_to_host(ap, &tf);
Jeff Garzike5338252005-10-30 21:37:17 -05001755 spin_unlock_irqrestore(&ap->host_set->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756
1757 /* spec says at least 2ms. but who knows with those
1758 * crazy ATAPI devices...
1759 */
1760 msleep(150);
1761
1762 return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
1763}
1764
1765static unsigned int ata_bus_softreset(struct ata_port *ap,
1766 unsigned int devmask)
1767{
1768 struct ata_ioports *ioaddr = &ap->ioaddr;
1769
1770 DPRINTK("ata%u: bus reset via SRST\n", ap->id);
1771
1772 /* software reset. causes dev0 to be selected */
1773 if (ap->flags & ATA_FLAG_MMIO) {
1774 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1775 udelay(20); /* FIXME: flush */
1776 writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
1777 udelay(20); /* FIXME: flush */
1778 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1779 } else {
1780 outb(ap->ctl, ioaddr->ctl_addr);
1781 udelay(10);
1782 outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
1783 udelay(10);
1784 outb(ap->ctl, ioaddr->ctl_addr);
1785 }
1786
1787 /* spec mandates ">= 2ms" before checking status.
1788 * We wait 150ms, because that was the magic delay used for
1789 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
1790 * between when the ATA command register is written, and then
1791 * status is checked. Because waiting for "a while" before
1792 * checking status is fine, post SRST, we perform this magic
1793 * delay here as well.
1794 */
1795 msleep(150);
1796
1797 ata_bus_post_reset(ap, devmask);
1798
1799 return 0;
1800}
1801
1802/**
1803 * ata_bus_reset - reset host port and associated ATA channel
1804 * @ap: port to reset
1805 *
1806 * This is typically the first time we actually start issuing
1807 * commands to the ATA channel. We wait for BSY to clear, then
1808 * issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
1809 * result. Determine what devices, if any, are on the channel
1810 * by looking at the device 0/1 error register. Look at the signature
1811 * stored in each device's taskfile registers, to determine if
1812 * the device is ATA or ATAPI.
1813 *
1814 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04001815 * PCI/etc. bus probe sem.
1816 * Obtains host_set lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 *
1818 * SIDE EFFECTS:
1819 * Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
1820 */
1821
1822void ata_bus_reset(struct ata_port *ap)
1823{
1824 struct ata_ioports *ioaddr = &ap->ioaddr;
1825 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
1826 u8 err;
1827 unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;
1828
1829 DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
1830
1831 /* determine if device 0/1 are present */
1832 if (ap->flags & ATA_FLAG_SATA_RESET)
1833 dev0 = 1;
1834 else {
1835 dev0 = ata_devchk(ap, 0);
1836 if (slave_possible)
1837 dev1 = ata_devchk(ap, 1);
1838 }
1839
1840 if (dev0)
1841 devmask |= (1 << 0);
1842 if (dev1)
1843 devmask |= (1 << 1);
1844
1845 /* select device 0 again */
1846 ap->ops->dev_select(ap, 0);
1847
1848 /* issue bus reset */
1849 if (ap->flags & ATA_FLAG_SRST)
1850 rc = ata_bus_softreset(ap, devmask);
1851 else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
1852 /* set up device control */
1853 if (ap->flags & ATA_FLAG_MMIO)
1854 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1855 else
1856 outb(ap->ctl, ioaddr->ctl_addr);
1857 rc = ata_bus_edd(ap);
1858 }
1859
1860 if (rc)
1861 goto err_out;
1862
1863 /*
1864 * determine by signature whether we have ATA or ATAPI devices
1865 */
Tejun Heob4dc7622006-01-24 17:05:22 +09001866 ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867 if ((slave_possible) && (err != 0x81))
Tejun Heob4dc7622006-01-24 17:05:22 +09001868 ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869
1870 /* re-enable interrupts */
1871 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
1872 ata_irq_on(ap);
1873
1874 /* is double-select really necessary? */
1875 if (ap->device[1].class != ATA_DEV_NONE)
1876 ap->ops->dev_select(ap, 1);
1877 if (ap->device[0].class != ATA_DEV_NONE)
1878 ap->ops->dev_select(ap, 0);
1879
1880 /* if no devices were detected, disable this port */
1881 if ((ap->device[0].class == ATA_DEV_NONE) &&
1882 (ap->device[1].class == ATA_DEV_NONE))
1883 goto err_out;
1884
1885 if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
1886 /* set up device control for ATA_FLAG_SATA_RESET */
1887 if (ap->flags & ATA_FLAG_MMIO)
1888 writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
1889 else
1890 outb(ap->ctl, ioaddr->ctl_addr);
1891 }
1892
1893 DPRINTK("EXIT\n");
1894 return;
1895
1896err_out:
1897 printk(KERN_ERR "ata%u: disabling port\n", ap->id);
1898 ap->ops->port_disable(ap);
1899
1900 DPRINTK("EXIT\n");
1901}
1902
Tejun Heo7a7921e2006-02-02 18:20:00 +09001903static int sata_phy_resume(struct ata_port *ap)
1904{
1905 unsigned long timeout = jiffies + (HZ * 5);
1906 u32 sstatus;
1907
1908 scr_write_flush(ap, SCR_CONTROL, 0x300);
1909
1910 /* Wait for phy to become ready, if necessary. */
1911 do {
1912 msleep(200);
1913 sstatus = scr_read(ap, SCR_STATUS);
1914 if ((sstatus & 0xf) != 1)
1915 return 0;
1916 } while (time_before(jiffies, timeout));
1917
1918 return -1;
1919}
1920
Tejun Heoc2bd5802006-01-24 17:05:22 +09001921/**
Tejun Heo8a19ac82006-02-02 18:20:00 +09001922 * ata_std_probeinit - initialize probing
1923 * @ap: port to be probed
1924 *
1925 * @ap is about to be probed. Initialize it. This function is
1926 * to be used as standard callback for ata_drive_probe_reset().
1927 */
1928extern void ata_std_probeinit(struct ata_port *ap)
1929{
1930 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
1931 sata_phy_resume(ap);
1932}
1933
1934/**
Tejun Heoc2bd5802006-01-24 17:05:22 +09001935 * ata_std_softreset - reset host port via ATA SRST
1936 * @ap: port to reset
1937 * @verbose: fail verbosely
1938 * @classes: resulting classes of attached devices
1939 *
1940 * Reset host port using ATA SRST. This function is to be used
1941 * as standard callback for ata_drive_*_reset() functions.
1942 *
1943 * LOCKING:
1944 * Kernel thread context (may sleep)
1945 *
1946 * RETURNS:
1947 * 0 on success, -errno otherwise.
1948 */
1949int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
1950{
1951 unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
1952 unsigned int devmask = 0, err_mask;
1953 u8 err;
1954
1955 DPRINTK("ENTER\n");
1956
1957 /* determine if device 0/1 are present */
1958 if (ata_devchk(ap, 0))
1959 devmask |= (1 << 0);
1960 if (slave_possible && ata_devchk(ap, 1))
1961 devmask |= (1 << 1);
1962
1963 /* devchk reports device presence without actual device on
1964 * most SATA controllers. Check SStatus and turn devmask off
1965 * if link is offline. Note that we should continue resetting
1966 * even when it seems like there's no device.
1967 */
1968 if (ap->ops->scr_read && !sata_dev_present(ap))
1969 devmask = 0;
1970
1971 /* select device 0 again */
1972 ap->ops->dev_select(ap, 0);
1973
1974 /* issue bus reset */
1975 DPRINTK("about to softreset, devmask=%x\n", devmask);
1976 err_mask = ata_bus_softreset(ap, devmask);
1977 if (err_mask) {
1978 if (verbose)
1979 printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
1980 ap->id, err_mask);
1981 else
1982 DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
1983 err_mask);
1984 return -EIO;
1985 }
1986
1987 /* determine by signature whether we have ATA or ATAPI devices */
1988 classes[0] = ata_dev_try_classify(ap, 0, &err);
1989 if (slave_possible && err != 0x81)
1990 classes[1] = ata_dev_try_classify(ap, 1, &err);
1991
1992 DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
1993 return 0;
1994}
1995
1996/**
1997 * sata_std_hardreset - reset host port via SATA phy reset
1998 * @ap: port to reset
1999 * @verbose: fail verbosely
2000 * @class: resulting class of attached device
2001 *
2002 * SATA phy-reset host port using DET bits of SControl register.
2003 * This function is to be used as standard callback for
2004 * ata_drive_*_reset().
2005 *
2006 * LOCKING:
2007 * Kernel thread context (may sleep)
2008 *
2009 * RETURNS:
2010 * 0 on success, -errno otherwise.
2011 */
2012int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
2013{
Tejun Heo7a7921e2006-02-02 18:20:00 +09002014 u32 serror;
Tejun Heoc2bd5802006-01-24 17:05:22 +09002015
2016 DPRINTK("ENTER\n");
2017
2018 /* Issue phy wake/reset */
2019 scr_write_flush(ap, SCR_CONTROL, 0x301);
2020
2021 /*
2022 * Couldn't find anything in SATA I/II specs, but AHCI-1.1
2023 * 10.4.2 says at least 1 ms.
2024 */
2025 msleep(1);
2026
Tejun Heo7a7921e2006-02-02 18:20:00 +09002027 /* Bring phy back */
2028 sata_phy_resume(ap);
Tejun Heoc2bd5802006-01-24 17:05:22 +09002029
2030 /* Clear SError */
2031 serror = scr_read(ap, SCR_ERROR);
2032 scr_write(ap, SCR_ERROR, serror);
2033
2034 /* TODO: phy layer with polling, timeouts, etc. */
2035 if (!sata_dev_present(ap)) {
2036 *class = ATA_DEV_NONE;
2037 DPRINTK("EXIT, link offline\n");
2038 return 0;
2039 }
2040
2041 if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
2042 if (verbose)
2043 printk(KERN_ERR "ata%u: COMRESET failed "
2044 "(device not ready)\n", ap->id);
2045 else
2046 DPRINTK("EXIT, device not ready\n");
2047 return -EIO;
2048 }
2049
2050 *class = ata_dev_try_classify(ap, 0, NULL);
2051
2052 DPRINTK("EXIT, class=%u\n", *class);
2053 return 0;
2054}
2055
2056/**
2057 * ata_std_postreset - standard postreset callback
2058 * @ap: the target ata_port
2059 * @classes: classes of attached devices
2060 *
2061 * This function is invoked after a successful reset. Note that
2062 * the device might have been reset more than once using
2063 * different reset methods before postreset is invoked.
2064 * postreset is also reponsible for setting cable type.
2065 *
2066 * This function is to be used as standard callback for
2067 * ata_drive_*_reset().
2068 *
2069 * LOCKING:
2070 * Kernel thread context (may sleep)
2071 */
2072void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
2073{
2074 DPRINTK("ENTER\n");
2075
2076 /* set cable type */
2077 if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
2078 ap->cbl = ATA_CBL_SATA;
2079
2080 /* print link status */
2081 if (ap->cbl == ATA_CBL_SATA)
2082 sata_print_link_status(ap);
2083
2084 /* bail out if no device is present */
2085 if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
2086 DPRINTK("EXIT, no device\n");
2087 return;
2088 }
2089
2090 /* is double-select really necessary? */
2091 if (classes[0] != ATA_DEV_NONE)
2092 ap->ops->dev_select(ap, 1);
2093 if (classes[1] != ATA_DEV_NONE)
2094 ap->ops->dev_select(ap, 0);
2095
2096 /* re-enable interrupts & set up device control */
2097 if (ap->ioaddr.ctl_addr) /* FIXME: hack. create a hook instead */
2098 ata_irq_on(ap);
2099
2100 DPRINTK("EXIT\n");
2101}
2102
2103/**
2104 * ata_std_probe_reset - standard probe reset method
2105 * @ap: prot to perform probe-reset
2106 * @classes: resulting classes of attached devices
2107 *
2108 * The stock off-the-shelf ->probe_reset method.
2109 *
2110 * LOCKING:
2111 * Kernel thread context (may sleep)
2112 *
2113 * RETURNS:
2114 * 0 on success, -errno otherwise.
2115 */
2116int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
2117{
2118 ata_reset_fn_t hardreset;
2119
2120 hardreset = NULL;
Tejun Heob911fc32006-02-02 18:20:00 +09002121 if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
Tejun Heoc2bd5802006-01-24 17:05:22 +09002122 hardreset = sata_std_hardreset;
2123
Tejun Heo8a19ac82006-02-02 18:20:00 +09002124 return ata_drive_probe_reset(ap, ata_std_probeinit,
Tejun Heo7944ea92006-02-02 18:20:00 +09002125 ata_std_softreset, hardreset,
Tejun Heoc2bd5802006-01-24 17:05:22 +09002126 ata_std_postreset, classes);
2127}
2128
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002129static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
2130 ata_postreset_fn_t postreset,
2131 unsigned int *classes)
2132{
2133 int i, rc;
2134
2135 for (i = 0; i < ATA_MAX_DEVICES; i++)
2136 classes[i] = ATA_DEV_UNKNOWN;
2137
2138 rc = reset(ap, 0, classes);
2139 if (rc)
2140 return rc;
2141
2142 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
2143 * is complete and convert all ATA_DEV_UNKNOWN to
2144 * ATA_DEV_NONE.
2145 */
2146 for (i = 0; i < ATA_MAX_DEVICES; i++)
2147 if (classes[i] != ATA_DEV_UNKNOWN)
2148 break;
2149
2150 if (i < ATA_MAX_DEVICES)
2151 for (i = 0; i < ATA_MAX_DEVICES; i++)
2152 if (classes[i] == ATA_DEV_UNKNOWN)
2153 classes[i] = ATA_DEV_NONE;
2154
2155 if (postreset)
2156 postreset(ap, classes);
2157
2158 return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
2159}
2160
2161/**
2162 * ata_drive_probe_reset - Perform probe reset with given methods
2163 * @ap: port to reset
Tejun Heo7944ea92006-02-02 18:20:00 +09002164 * @probeinit: probeinit method (can be NULL)
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002165 * @softreset: softreset method (can be NULL)
2166 * @hardreset: hardreset method (can be NULL)
2167 * @postreset: postreset method (can be NULL)
2168 * @classes: resulting classes of attached devices
2169 *
2170 * Reset the specified port and classify attached devices using
2171 * given methods. This function prefers softreset but tries all
2172 * possible reset sequences to reset and classify devices. This
2173 * function is intended to be used for constructing ->probe_reset
2174 * callback by low level drivers.
2175 *
2176 * Reset methods should follow the following rules.
2177 *
2178 * - Return 0 on sucess, -errno on failure.
2179 * - If classification is supported, fill classes[] with
2180 * recognized class codes.
2181 * - If classification is not supported, leave classes[] alone.
2182 * - If verbose is non-zero, print error message on failure;
2183 * otherwise, shut up.
2184 *
2185 * LOCKING:
2186 * Kernel thread context (may sleep)
2187 *
2188 * RETURNS:
2189 * 0 on success, -EINVAL if no reset method is avaliable, -ENODEV
2190 * if classification fails, and any error code from reset
2191 * methods.
2192 */
Tejun Heo7944ea92006-02-02 18:20:00 +09002193int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002194 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
2195 ata_postreset_fn_t postreset, unsigned int *classes)
2196{
2197 int rc = -EINVAL;
2198
Tejun Heo7944ea92006-02-02 18:20:00 +09002199 if (probeinit)
2200 probeinit(ap);
2201
Tejun Heoa62c0fc2006-01-24 17:05:22 +09002202 if (softreset) {
2203 rc = do_probe_reset(ap, softreset, postreset, classes);
2204 if (rc == 0)
2205 return 0;
2206 }
2207
2208 if (!hardreset)
2209 return rc;
2210
2211 rc = do_probe_reset(ap, hardreset, postreset, classes);
2212 if (rc == 0 || rc != -ENODEV)
2213 return rc;
2214
2215 if (softreset)
2216 rc = do_probe_reset(ap, softreset, postreset, classes);
2217
2218 return rc;
2219}
2220
Jeff Garzik057ace52005-10-22 14:27:05 -04002221static void ata_pr_blacklisted(const struct ata_port *ap,
2222 const struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002223{
2224 printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, disabling DMA\n",
2225 ap->id, dev->devno);
2226}
2227
Arjan van de Ven98ac62d2005-11-28 10:06:23 +01002228static const char * const ata_dma_blacklist [] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229 "WDC AC11000H",
2230 "WDC AC22100H",
2231 "WDC AC32500H",
2232 "WDC AC33100H",
2233 "WDC AC31600H",
2234 "WDC AC32100H",
2235 "WDC AC23200L",
2236 "Compaq CRD-8241B",
2237 "CRD-8400B",
2238 "CRD-8480B",
2239 "CRD-8482B",
2240 "CRD-84",
2241 "SanDisk SDP3B",
2242 "SanDisk SDP3B-64",
2243 "SANYO CD-ROM CRD",
2244 "HITACHI CDR-8",
2245 "HITACHI CDR-8335",
2246 "HITACHI CDR-8435",
2247 "Toshiba CD-ROM XM-6202B",
Jeff Garzike9222562005-06-28 00:03:37 -04002248 "TOSHIBA CD-ROM XM-1702BC",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002249 "CD-532E-A",
2250 "E-IDE CD-ROM CR-840",
2251 "CD-ROM Drive/F5A",
2252 "WPI CDD-820",
2253 "SAMSUNG CD-ROM SC-148C",
2254 "SAMSUNG CD-ROM SC",
2255 "SanDisk SDP3B-64",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256 "ATAPI CD-ROM DRIVE 40X MAXIMUM",
2257 "_NEC DV5800A",
2258};
2259
Jeff Garzik057ace52005-10-22 14:27:05 -04002260static int ata_dma_blacklisted(const struct ata_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002261{
2262 unsigned char model_num[40];
2263 char *s;
2264 unsigned int len;
2265 int i;
2266
2267 ata_dev_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
2268 sizeof(model_num));
2269 s = &model_num[0];
2270 len = strnlen(s, sizeof(model_num));
2271
2272 /* ATAPI specifies that empty space is blank-filled; remove blanks */
2273 while ((len > 0) && (s[len - 1] == ' ')) {
2274 len--;
2275 s[len] = 0;
2276 }
2277
2278 for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i++)
2279 if (!strncmp(ata_dma_blacklist[i], s, len))
2280 return 1;
2281
2282 return 0;
2283}
2284
Jeff Garzik057ace52005-10-22 14:27:05 -04002285static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002286{
Jeff Garzik057ace52005-10-22 14:27:05 -04002287 const struct ata_device *master, *slave;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002288 unsigned int mask;
2289
2290 master = &ap->device[0];
2291 slave = &ap->device[1];
2292
2293 assert (ata_dev_present(master) || ata_dev_present(slave));
2294
2295 if (shift == ATA_SHIFT_UDMA) {
2296 mask = ap->udma_mask;
2297 if (ata_dev_present(master)) {
2298 mask &= (master->id[ATA_ID_UDMA_MODES] & 0xff);
Jeff Garzik057ace52005-10-22 14:27:05 -04002299 if (ata_dma_blacklisted(master)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002300 mask = 0;
2301 ata_pr_blacklisted(ap, master);
2302 }
2303 }
2304 if (ata_dev_present(slave)) {
2305 mask &= (slave->id[ATA_ID_UDMA_MODES] & 0xff);
Jeff Garzik057ace52005-10-22 14:27:05 -04002306 if (ata_dma_blacklisted(slave)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307 mask = 0;
2308 ata_pr_blacklisted(ap, slave);
2309 }
2310 }
2311 }
2312 else if (shift == ATA_SHIFT_MWDMA) {
2313 mask = ap->mwdma_mask;
2314 if (ata_dev_present(master)) {
2315 mask &= (master->id[ATA_ID_MWDMA_MODES] & 0x07);
Jeff Garzik057ace52005-10-22 14:27:05 -04002316 if (ata_dma_blacklisted(master)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002317 mask = 0;
2318 ata_pr_blacklisted(ap, master);
2319 }
2320 }
2321 if (ata_dev_present(slave)) {
2322 mask &= (slave->id[ATA_ID_MWDMA_MODES] & 0x07);
Jeff Garzik057ace52005-10-22 14:27:05 -04002323 if (ata_dma_blacklisted(slave)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002324 mask = 0;
2325 ata_pr_blacklisted(ap, slave);
2326 }
2327 }
2328 }
2329 else if (shift == ATA_SHIFT_PIO) {
2330 mask = ap->pio_mask;
2331 if (ata_dev_present(master)) {
2332 /* spec doesn't return explicit support for
2333 * PIO0-2, so we fake it
2334 */
2335 u16 tmp_mode = master->id[ATA_ID_PIO_MODES] & 0x03;
2336 tmp_mode <<= 3;
2337 tmp_mode |= 0x7;
2338 mask &= tmp_mode;
2339 }
2340 if (ata_dev_present(slave)) {
2341 /* spec doesn't return explicit support for
2342 * PIO0-2, so we fake it
2343 */
2344 u16 tmp_mode = slave->id[ATA_ID_PIO_MODES] & 0x03;
2345 tmp_mode <<= 3;
2346 tmp_mode |= 0x7;
2347 mask &= tmp_mode;
2348 }
2349 }
2350 else {
2351 mask = 0xffffffff; /* shut up compiler warning */
2352 BUG();
2353 }
2354
2355 return mask;
2356}
2357
2358/* find greatest bit */
2359static int fgb(u32 bitmap)
2360{
2361 unsigned int i;
2362 int x = -1;
2363
2364 for (i = 0; i < 32; i++)
2365 if (bitmap & (1 << i))
2366 x = i;
2367
2368 return x;
2369}
2370
2371/**
2372 * ata_choose_xfer_mode - attempt to find best transfer mode
2373 * @ap: Port for which an xfer mode will be selected
2374 * @xfer_mode_out: (output) SET FEATURES - XFER MODE code
2375 * @xfer_shift_out: (output) bit shift that selects this mode
2376 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04002377 * Based on host and device capabilities, determine the
2378 * maximum transfer mode that is amenable to all.
2379 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002380 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002381 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002382 *
2383 * RETURNS:
2384 * Zero on success, negative on error.
2385 */
2386
Jeff Garzik057ace52005-10-22 14:27:05 -04002387static int ata_choose_xfer_mode(const struct ata_port *ap,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002388 u8 *xfer_mode_out,
2389 unsigned int *xfer_shift_out)
2390{
2391 unsigned int mask, shift;
2392 int x, i;
2393
2394 for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++) {
2395 shift = xfer_mode_classes[i].shift;
2396 mask = ata_get_mode_mask(ap, shift);
2397
2398 x = fgb(mask);
2399 if (x >= 0) {
2400 *xfer_mode_out = xfer_mode_classes[i].base + x;
2401 *xfer_shift_out = shift;
2402 return 0;
2403 }
2404 }
2405
2406 return -1;
2407}
2408
2409/**
2410 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
2411 * @ap: Port associated with device @dev
2412 * @dev: Device to which command will be sent
2413 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04002414 * Issue SET FEATURES - XFER MODE command to device @dev
2415 * on port @ap.
2416 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002417 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002418 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419 */
2420
2421static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
2422{
Tejun Heoa0123702005-12-13 14:49:31 +09002423 struct ata_taskfile tf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002424
2425 /* set up set-features taskfile */
2426 DPRINTK("set features - xfer mode\n");
2427
Tejun Heoa0123702005-12-13 14:49:31 +09002428 ata_tf_init(ap, &tf, dev->devno);
2429 tf.command = ATA_CMD_SET_FEATURES;
2430 tf.feature = SETFEATURES_XFER;
2431 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2432 tf.protocol = ATA_PROT_NODATA;
2433 tf.nsect = dev->xfer_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002434
Tejun Heoa0123702005-12-13 14:49:31 +09002435 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2436 printk(KERN_ERR "ata%u: failed to set xfermode, disabled\n",
2437 ap->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002438 ata_port_disable(ap);
Tejun Heoa0123702005-12-13 14:49:31 +09002439 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002440
2441 DPRINTK("EXIT\n");
2442}
2443
2444/**
Albert Lee59a10b12005-10-12 15:09:42 +08002445 * ata_dev_reread_id - Reread the device identify device info
2446 * @ap: port where the device is
2447 * @dev: device to reread the identify device info
2448 *
2449 * LOCKING:
2450 */
2451
2452static void ata_dev_reread_id(struct ata_port *ap, struct ata_device *dev)
2453{
Tejun Heoa0123702005-12-13 14:49:31 +09002454 struct ata_taskfile tf;
Albert Lee59a10b12005-10-12 15:09:42 +08002455
Tejun Heoa0123702005-12-13 14:49:31 +09002456 ata_tf_init(ap, &tf, dev->devno);
Albert Lee59a10b12005-10-12 15:09:42 +08002457
2458 if (dev->class == ATA_DEV_ATA) {
Tejun Heoa0123702005-12-13 14:49:31 +09002459 tf.command = ATA_CMD_ID_ATA;
Albert Lee59a10b12005-10-12 15:09:42 +08002460 DPRINTK("do ATA identify\n");
2461 } else {
Tejun Heoa0123702005-12-13 14:49:31 +09002462 tf.command = ATA_CMD_ID_ATAPI;
Albert Lee59a10b12005-10-12 15:09:42 +08002463 DPRINTK("do ATAPI identify\n");
2464 }
2465
Tejun Heoa0123702005-12-13 14:49:31 +09002466 tf.flags |= ATA_TFLAG_DEVICE;
2467 tf.protocol = ATA_PROT_PIO;
Albert Lee59a10b12005-10-12 15:09:42 +08002468
Tejun Heoa0123702005-12-13 14:49:31 +09002469 if (ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
2470 dev->id, sizeof(dev->id)))
Albert Lee59a10b12005-10-12 15:09:42 +08002471 goto err_out;
2472
Albert Lee59a10b12005-10-12 15:09:42 +08002473 swap_buf_le16(dev->id, ATA_ID_WORDS);
2474
2475 ata_dump_id(dev);
2476
2477 DPRINTK("EXIT\n");
2478
2479 return;
2480err_out:
Tejun Heoa0123702005-12-13 14:49:31 +09002481 printk(KERN_ERR "ata%u: failed to reread ID, disabled\n", ap->id);
Albert Lee59a10b12005-10-12 15:09:42 +08002482 ata_port_disable(ap);
2483}
2484
2485/**
Albert Lee8bf62ec2005-05-12 15:29:42 -04002486 * ata_dev_init_params - Issue INIT DEV PARAMS command
2487 * @ap: Port associated with device @dev
2488 * @dev: Device to which command will be sent
2489 *
2490 * LOCKING:
2491 */
2492
2493static void ata_dev_init_params(struct ata_port *ap, struct ata_device *dev)
2494{
Tejun Heoa0123702005-12-13 14:49:31 +09002495 struct ata_taskfile tf;
Albert Lee8bf62ec2005-05-12 15:29:42 -04002496 u16 sectors = dev->id[6];
2497 u16 heads = dev->id[3];
2498
2499 /* Number of sectors per track 1-255. Number of heads 1-16 */
2500 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2501 return;
2502
2503 /* set up init dev params taskfile */
2504 DPRINTK("init dev params \n");
2505
Tejun Heoa0123702005-12-13 14:49:31 +09002506 ata_tf_init(ap, &tf, dev->devno);
2507 tf.command = ATA_CMD_INIT_DEV_PARAMS;
2508 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2509 tf.protocol = ATA_PROT_NODATA;
2510 tf.nsect = sectors;
2511 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
Albert Lee8bf62ec2005-05-12 15:29:42 -04002512
Tejun Heoa0123702005-12-13 14:49:31 +09002513 if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
2514 printk(KERN_ERR "ata%u: failed to init parameters, disabled\n",
2515 ap->id);
Albert Lee8bf62ec2005-05-12 15:29:42 -04002516 ata_port_disable(ap);
Tejun Heoa0123702005-12-13 14:49:31 +09002517 }
Albert Lee8bf62ec2005-05-12 15:29:42 -04002518
2519 DPRINTK("EXIT\n");
2520}
2521
2522/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04002523 * ata_sg_clean - Unmap DMA memory associated with command
2524 * @qc: Command containing DMA memory to be released
2525 *
2526 * Unmap all mapped DMA memory associated with this command.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002527 *
2528 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002529 * spin_lock_irqsave(host_set lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002530 */
2531
2532static void ata_sg_clean(struct ata_queued_cmd *qc)
2533{
2534 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002535 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002536 int dir = qc->dma_dir;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002537 void *pad_buf = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002538
2539 assert(qc->flags & ATA_QCFLAG_DMAMAP);
2540 assert(sg != NULL);
2541
2542 if (qc->flags & ATA_QCFLAG_SINGLE)
2543 assert(qc->n_elem == 1);
2544
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05002545 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002546
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002547 /* if we padded the buffer out to 32-bit bound, and data
2548 * xfer direction is from-device, we must copy from the
2549 * pad buffer back into the supplied buffer
2550 */
2551 if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
2552 pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2553
2554 if (qc->flags & ATA_QCFLAG_SG) {
Jeff Garzike1410f22005-11-14 14:06:26 -05002555 if (qc->n_elem)
2556 dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002557 /* restore last sg */
2558 sg[qc->orig_n_elem - 1].length += qc->pad_len;
2559 if (pad_buf) {
2560 struct scatterlist *psg = &qc->pad_sgent;
2561 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2562 memcpy(addr + psg->offset, pad_buf, qc->pad_len);
Mark Lorddfa15982005-12-12 23:19:28 -05002563 kunmap_atomic(addr, KM_IRQ0);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002564 }
2565 } else {
Jeff Garzike1410f22005-11-14 14:06:26 -05002566 if (sg_dma_len(&sg[0]) > 0)
2567 dma_unmap_single(ap->host_set->dev,
2568 sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
2569 dir);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002570 /* restore sg */
2571 sg->length += qc->pad_len;
2572 if (pad_buf)
2573 memcpy(qc->buf_virt + sg->length - qc->pad_len,
2574 pad_buf, qc->pad_len);
2575 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002576
2577 qc->flags &= ~ATA_QCFLAG_DMAMAP;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002578 qc->__sg = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002579}
2580
2581/**
2582 * ata_fill_sg - Fill PCI IDE PRD table
2583 * @qc: Metadata associated with taskfile to be transferred
2584 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04002585 * Fill PCI IDE PRD (scatter-gather) table with segments
2586 * associated with the current disk command.
2587 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002588 * LOCKING:
Jeff Garzik780a87f2005-05-30 15:41:05 -04002589 * spin_lock_irqsave(host_set lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002590 *
2591 */
2592static void ata_fill_sg(struct ata_queued_cmd *qc)
2593{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002594 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002595 struct scatterlist *sg;
2596 unsigned int idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002597
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002598 assert(qc->__sg != NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002599 assert(qc->n_elem > 0);
2600
2601 idx = 0;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002602 ata_for_each_sg(sg, qc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002603 u32 addr, offset;
2604 u32 sg_len, len;
2605
2606 /* determine if physical DMA addr spans 64K boundary.
2607 * Note h/w doesn't support 64-bit, so we unconditionally
2608 * truncate dma_addr_t to u32.
2609 */
2610 addr = (u32) sg_dma_address(sg);
2611 sg_len = sg_dma_len(sg);
2612
2613 while (sg_len) {
2614 offset = addr & 0xffff;
2615 len = sg_len;
2616 if ((offset + sg_len) > 0x10000)
2617 len = 0x10000 - offset;
2618
2619 ap->prd[idx].addr = cpu_to_le32(addr);
2620 ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
2621 VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
2622
2623 idx++;
2624 sg_len -= len;
2625 addr += len;
2626 }
2627 }
2628
2629 if (idx)
2630 ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
2631}
2632/**
2633 * ata_check_atapi_dma - Check whether ATAPI DMA can be supported
2634 * @qc: Metadata associated with taskfile to check
2635 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04002636 * Allow low-level driver to filter ATA PACKET commands, returning
2637 * a status indicating whether or not it is OK to use DMA for the
2638 * supplied PACKET command.
2639 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002640 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002641 * spin_lock_irqsave(host_set lock)
2642 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002643 * RETURNS: 0 when ATAPI DMA can be used
2644 * nonzero otherwise
2645 */
2646int ata_check_atapi_dma(struct ata_queued_cmd *qc)
2647{
2648 struct ata_port *ap = qc->ap;
2649 int rc = 0; /* Assume ATAPI DMA is OK by default */
2650
2651 if (ap->ops->check_atapi_dma)
2652 rc = ap->ops->check_atapi_dma(qc);
2653
2654 return rc;
2655}
2656/**
2657 * ata_qc_prep - Prepare taskfile for submission
2658 * @qc: Metadata associated with taskfile to be prepared
2659 *
Jeff Garzik780a87f2005-05-30 15:41:05 -04002660 * Prepare ATA taskfile for submission.
2661 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662 * LOCKING:
2663 * spin_lock_irqsave(host_set lock)
2664 */
2665void ata_qc_prep(struct ata_queued_cmd *qc)
2666{
2667 if (!(qc->flags & ATA_QCFLAG_DMAMAP))
2668 return;
2669
2670 ata_fill_sg(qc);
2671}
2672
Jeff Garzik0cba6322005-05-30 19:49:12 -04002673/**
2674 * ata_sg_init_one - Associate command with memory buffer
2675 * @qc: Command to be associated
2676 * @buf: Memory buffer
2677 * @buflen: Length of memory buffer, in bytes.
2678 *
2679 * Initialize the data-related elements of queued_cmd @qc
2680 * to point to a single memory buffer, @buf of byte length @buflen.
2681 *
2682 * LOCKING:
2683 * spin_lock_irqsave(host_set lock)
2684 */
2685
Linus Torvalds1da177e2005-04-16 15:20:36 -07002686void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
2687{
2688 struct scatterlist *sg;
2689
2690 qc->flags |= ATA_QCFLAG_SINGLE;
2691
2692 memset(&qc->sgent, 0, sizeof(qc->sgent));
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002693 qc->__sg = &qc->sgent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002694 qc->n_elem = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002695 qc->orig_n_elem = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002696 qc->buf_virt = buf;
2697
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002698 sg = qc->__sg;
Jeff Garzikf0612bb2005-10-30 01:58:18 -05002699 sg_init_one(sg, buf, buflen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002700}
2701
Jeff Garzik0cba6322005-05-30 19:49:12 -04002702/**
2703 * ata_sg_init - Associate command with scatter-gather table.
2704 * @qc: Command to be associated
2705 * @sg: Scatter-gather table.
2706 * @n_elem: Number of elements in s/g table.
2707 *
2708 * Initialize the data-related elements of queued_cmd @qc
2709 * to point to a scatter-gather table @sg, containing @n_elem
2710 * elements.
2711 *
2712 * LOCKING:
2713 * spin_lock_irqsave(host_set lock)
2714 */
2715
Linus Torvalds1da177e2005-04-16 15:20:36 -07002716void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
2717 unsigned int n_elem)
2718{
2719 qc->flags |= ATA_QCFLAG_SG;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002720 qc->__sg = sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002721 qc->n_elem = n_elem;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002722 qc->orig_n_elem = n_elem;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002723}
2724
2725/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04002726 * ata_sg_setup_one - DMA-map the memory buffer associated with a command.
2727 * @qc: Command with memory buffer to be mapped.
2728 *
2729 * DMA-map the memory buffer associated with queued_cmd @qc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002730 *
2731 * LOCKING:
2732 * spin_lock_irqsave(host_set lock)
2733 *
2734 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002735 * Zero on success, negative on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002736 */
2737
2738static int ata_sg_setup_one(struct ata_queued_cmd *qc)
2739{
2740 struct ata_port *ap = qc->ap;
2741 int dir = qc->dma_dir;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002742 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002743 dma_addr_t dma_address;
2744
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002745 /* we must lengthen transfers to end on a 32-bit boundary */
2746 qc->pad_len = sg->length & 3;
2747 if (qc->pad_len) {
2748 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2749 struct scatterlist *psg = &qc->pad_sgent;
2750
2751 assert(qc->dev->class == ATA_DEV_ATAPI);
2752
2753 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2754
2755 if (qc->tf.flags & ATA_TFLAG_WRITE)
2756 memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
2757 qc->pad_len);
2758
2759 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
2760 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
2761 /* trim sg */
2762 sg->length -= qc->pad_len;
2763
2764 DPRINTK("padding done, sg->length=%u pad_len=%u\n",
2765 sg->length, qc->pad_len);
2766 }
2767
Jeff Garzike1410f22005-11-14 14:06:26 -05002768 if (!sg->length) {
2769 sg_dma_address(sg) = 0;
2770 goto skip_map;
2771 }
2772
Linus Torvalds1da177e2005-04-16 15:20:36 -07002773 dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
Albert Lee32529e02005-05-26 03:49:42 -04002774 sg->length, dir);
Tejun Heo537a95d2005-11-05 14:29:01 -05002775 if (dma_mapping_error(dma_address)) {
2776 /* restore sg */
2777 sg->length += qc->pad_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002778 return -1;
Tejun Heo537a95d2005-11-05 14:29:01 -05002779 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002780
2781 sg_dma_address(sg) = dma_address;
Jeff Garzike1410f22005-11-14 14:06:26 -05002782skip_map:
Albert Lee32529e02005-05-26 03:49:42 -04002783 sg_dma_len(sg) = sg->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002784
2785 DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
2786 qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
2787
2788 return 0;
2789}
2790
2791/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04002792 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
2793 * @qc: Command with scatter-gather table to be mapped.
2794 *
2795 * DMA-map the scatter-gather table associated with queued_cmd @qc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002796 *
2797 * LOCKING:
2798 * spin_lock_irqsave(host_set lock)
2799 *
2800 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002801 * Zero on success, negative on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002802 *
2803 */
2804
2805static int ata_sg_setup(struct ata_queued_cmd *qc)
2806{
2807 struct ata_port *ap = qc->ap;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002808 struct scatterlist *sg = qc->__sg;
2809 struct scatterlist *lsg = &sg[qc->n_elem - 1];
Jeff Garzike1410f22005-11-14 14:06:26 -05002810 int n_elem, pre_n_elem, dir, trim_sg = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002811
2812 VPRINTK("ENTER, ata%u\n", ap->id);
2813 assert(qc->flags & ATA_QCFLAG_SG);
2814
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002815 /* we must lengthen transfers to end on a 32-bit boundary */
2816 qc->pad_len = lsg->length & 3;
2817 if (qc->pad_len) {
2818 void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
2819 struct scatterlist *psg = &qc->pad_sgent;
2820 unsigned int offset;
2821
2822 assert(qc->dev->class == ATA_DEV_ATAPI);
2823
2824 memset(pad_buf, 0, ATA_DMA_PAD_SZ);
2825
2826 /*
2827 * psg->page/offset are used to copy to-be-written
2828 * data in this function or read data in ata_sg_clean.
2829 */
2830 offset = lsg->offset + lsg->length - qc->pad_len;
2831 psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
2832 psg->offset = offset_in_page(offset);
2833
2834 if (qc->tf.flags & ATA_TFLAG_WRITE) {
2835 void *addr = kmap_atomic(psg->page, KM_IRQ0);
2836 memcpy(pad_buf, addr + psg->offset, qc->pad_len);
Mark Lorddfa15982005-12-12 23:19:28 -05002837 kunmap_atomic(addr, KM_IRQ0);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002838 }
2839
2840 sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
2841 sg_dma_len(psg) = ATA_DMA_PAD_SZ;
2842 /* trim last sg */
2843 lsg->length -= qc->pad_len;
Jeff Garzike1410f22005-11-14 14:06:26 -05002844 if (lsg->length == 0)
2845 trim_sg = 1;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04002846
2847 DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
2848 qc->n_elem - 1, lsg->length, qc->pad_len);
2849 }
2850
Jeff Garzike1410f22005-11-14 14:06:26 -05002851 pre_n_elem = qc->n_elem;
2852 if (trim_sg && pre_n_elem)
2853 pre_n_elem--;
2854
2855 if (!pre_n_elem) {
2856 n_elem = 0;
2857 goto skip_map;
2858 }
2859
Linus Torvalds1da177e2005-04-16 15:20:36 -07002860 dir = qc->dma_dir;
Jeff Garzike1410f22005-11-14 14:06:26 -05002861 n_elem = dma_map_sg(ap->host_set->dev, sg, pre_n_elem, dir);
Tejun Heo537a95d2005-11-05 14:29:01 -05002862 if (n_elem < 1) {
2863 /* restore last sg */
2864 lsg->length += qc->pad_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002865 return -1;
Tejun Heo537a95d2005-11-05 14:29:01 -05002866 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002867
2868 DPRINTK("%d sg elements mapped\n", n_elem);
2869
Jeff Garzike1410f22005-11-14 14:06:26 -05002870skip_map:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002871 qc->n_elem = n_elem;
2872
2873 return 0;
2874}
2875
2876/**
Tejun Heo40e8c822005-08-22 17:12:45 +09002877 * ata_poll_qc_complete - turn irq back on and finish qc
2878 * @qc: Command to complete
Randy Dunlap8e8b77d2005-11-01 21:29:27 -08002879 * @err_mask: ATA status register content
Tejun Heo40e8c822005-08-22 17:12:45 +09002880 *
2881 * LOCKING:
2882 * None. (grabs host lock)
2883 */
2884
Albert Leea22e2eb2005-12-05 15:38:02 +08002885void ata_poll_qc_complete(struct ata_queued_cmd *qc)
Tejun Heo40e8c822005-08-22 17:12:45 +09002886{
2887 struct ata_port *ap = qc->ap;
Jeff Garzikb8f61532005-08-25 22:01:20 -04002888 unsigned long flags;
Tejun Heo40e8c822005-08-22 17:12:45 +09002889
Jeff Garzikb8f61532005-08-25 22:01:20 -04002890 spin_lock_irqsave(&ap->host_set->lock, flags);
Tejun Heo40e8c822005-08-22 17:12:45 +09002891 ap->flags &= ~ATA_FLAG_NOINTR;
2892 ata_irq_on(ap);
Albert Leea22e2eb2005-12-05 15:38:02 +08002893 ata_qc_complete(qc);
Jeff Garzikb8f61532005-08-25 22:01:20 -04002894 spin_unlock_irqrestore(&ap->host_set->lock, flags);
Tejun Heo40e8c822005-08-22 17:12:45 +09002895}
2896
2897/**
Randy Dunlapc893a3a2006-01-28 13:15:32 -05002898 * ata_pio_poll - poll using PIO, depending on current state
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04002899 * @ap: the target ata_port
Linus Torvalds1da177e2005-04-16 15:20:36 -07002900 *
2901 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002902 * None. (executing in kernel thread context)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002903 *
2904 * RETURNS:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04002905 * timeout value to use
Linus Torvalds1da177e2005-04-16 15:20:36 -07002906 */
2907
2908static unsigned long ata_pio_poll(struct ata_port *ap)
2909{
Albert Leec14b8332005-12-05 15:36:08 +08002910 struct ata_queued_cmd *qc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002911 u8 status;
Albert Lee14be71f2005-09-27 17:36:35 +08002912 unsigned int poll_state = HSM_ST_UNKNOWN;
2913 unsigned int reg_state = HSM_ST_UNKNOWN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002914
Albert Leec14b8332005-12-05 15:36:08 +08002915 qc = ata_qc_from_tag(ap, ap->active_tag);
2916 assert(qc != NULL);
2917
Albert Lee14be71f2005-09-27 17:36:35 +08002918 switch (ap->hsm_task_state) {
2919 case HSM_ST:
2920 case HSM_ST_POLL:
2921 poll_state = HSM_ST_POLL;
2922 reg_state = HSM_ST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002923 break;
Albert Lee14be71f2005-09-27 17:36:35 +08002924 case HSM_ST_LAST:
2925 case HSM_ST_LAST_POLL:
2926 poll_state = HSM_ST_LAST_POLL;
2927 reg_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002928 break;
2929 default:
2930 BUG();
2931 break;
2932 }
2933
2934 status = ata_chk_status(ap);
2935 if (status & ATA_BUSY) {
2936 if (time_after(jiffies, ap->pio_task_timeout)) {
Tejun Heo11a56d22006-01-23 13:09:36 +09002937 qc->err_mask |= AC_ERR_TIMEOUT;
Albert Lee7c398332005-11-09 13:03:30 +08002938 ap->hsm_task_state = HSM_ST_TMOUT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002939 return 0;
2940 }
Albert Lee14be71f2005-09-27 17:36:35 +08002941 ap->hsm_task_state = poll_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002942 return ATA_SHORT_PAUSE;
2943 }
2944
Albert Lee14be71f2005-09-27 17:36:35 +08002945 ap->hsm_task_state = reg_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002946 return 0;
2947}
2948
2949/**
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04002950 * ata_pio_complete - check if drive is busy or idle
2951 * @ap: the target ata_port
Linus Torvalds1da177e2005-04-16 15:20:36 -07002952 *
2953 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04002954 * None. (executing in kernel thread context)
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04002955 *
2956 * RETURNS:
2957 * Non-zero if qc completed, zero otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002958 */
2959
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04002960static int ata_pio_complete (struct ata_port *ap)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002961{
2962 struct ata_queued_cmd *qc;
2963 u8 drv_stat;
2964
2965 /*
Alan Cox31433ea2005-08-26 15:56:47 +01002966 * This is purely heuristic. This is a fast path. Sometimes when
2967 * we enter, BSY will be cleared in a chk-status or two. If not,
2968 * the drive is probably seeking or something. Snooze for a couple
2969 * msecs, then chk-status again. If still busy, fall back to
Albert Lee14be71f2005-09-27 17:36:35 +08002970 * HSM_ST_POLL state.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002971 */
Albert Leefe79e682005-12-06 11:34:59 +08002972 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
2973 if (drv_stat & ATA_BUSY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002974 msleep(2);
Albert Leefe79e682005-12-06 11:34:59 +08002975 drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
2976 if (drv_stat & ATA_BUSY) {
Albert Lee14be71f2005-09-27 17:36:35 +08002977 ap->hsm_task_state = HSM_ST_LAST_POLL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002978 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04002979 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002980 }
2981 }
2982
Albert Leec14b8332005-12-05 15:36:08 +08002983 qc = ata_qc_from_tag(ap, ap->active_tag);
2984 assert(qc != NULL);
2985
Linus Torvalds1da177e2005-04-16 15:20:36 -07002986 drv_stat = ata_wait_idle(ap);
2987 if (!ata_ok(drv_stat)) {
Albert Lee1c848982005-12-05 15:40:15 +08002988 qc->err_mask |= __ac_err_mask(drv_stat);
Albert Lee14be71f2005-09-27 17:36:35 +08002989 ap->hsm_task_state = HSM_ST_ERR;
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04002990 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002991 }
2992
Albert Lee14be71f2005-09-27 17:36:35 +08002993 ap->hsm_task_state = HSM_ST_IDLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002994
Albert Leea22e2eb2005-12-05 15:38:02 +08002995 assert(qc->err_mask == 0);
2996 ata_poll_qc_complete(qc);
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04002997
2998 /* another command may start at this point */
2999
3000 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003001}
3002
Edward Falk0baab862005-06-02 18:17:13 -04003003
3004/**
Randy Dunlapc893a3a2006-01-28 13:15:32 -05003005 * swap_buf_le16 - swap halves of 16-bit words in place
Edward Falk0baab862005-06-02 18:17:13 -04003006 * @buf: Buffer to swap
3007 * @buf_words: Number of 16-bit words in buffer.
3008 *
3009 * Swap halves of 16-bit words if needed to convert from
3010 * little-endian byte order to native cpu byte order, or
3011 * vice-versa.
3012 *
3013 * LOCKING:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04003014 * Inherited from caller.
Edward Falk0baab862005-06-02 18:17:13 -04003015 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003016void swap_buf_le16(u16 *buf, unsigned int buf_words)
3017{
3018#ifdef __BIG_ENDIAN
3019 unsigned int i;
3020
3021 for (i = 0; i < buf_words; i++)
3022 buf[i] = le16_to_cpu(buf[i]);
3023#endif /* __BIG_ENDIAN */
3024}
3025
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003026/**
3027 * ata_mmio_data_xfer - Transfer data by MMIO
3028 * @ap: port to read/write
3029 * @buf: data buffer
3030 * @buflen: buffer length
Jeff Garzik344baba2005-09-07 01:15:17 -04003031 * @write_data: read/write
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003032 *
3033 * Transfer data from/to the device data register by MMIO.
3034 *
3035 * LOCKING:
3036 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003037 */
3038
Linus Torvalds1da177e2005-04-16 15:20:36 -07003039static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
3040 unsigned int buflen, int write_data)
3041{
3042 unsigned int i;
3043 unsigned int words = buflen >> 1;
3044 u16 *buf16 = (u16 *) buf;
3045 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
3046
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003047 /* Transfer multiple of 2 bytes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003048 if (write_data) {
3049 for (i = 0; i < words; i++)
3050 writew(le16_to_cpu(buf16[i]), mmio);
3051 } else {
3052 for (i = 0; i < words; i++)
3053 buf16[i] = cpu_to_le16(readw(mmio));
3054 }
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003055
3056 /* Transfer trailing 1 byte, if any. */
3057 if (unlikely(buflen & 0x01)) {
3058 u16 align_buf[1] = { 0 };
3059 unsigned char *trailing_buf = buf + buflen - 1;
3060
3061 if (write_data) {
3062 memcpy(align_buf, trailing_buf, 1);
3063 writew(le16_to_cpu(align_buf[0]), mmio);
3064 } else {
3065 align_buf[0] = cpu_to_le16(readw(mmio));
3066 memcpy(trailing_buf, align_buf, 1);
3067 }
3068 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003069}
3070
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003071/**
3072 * ata_pio_data_xfer - Transfer data by PIO
3073 * @ap: port to read/write
3074 * @buf: data buffer
3075 * @buflen: buffer length
Jeff Garzik344baba2005-09-07 01:15:17 -04003076 * @write_data: read/write
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003077 *
3078 * Transfer data from/to the device data register by PIO.
3079 *
3080 * LOCKING:
3081 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003082 */
3083
Linus Torvalds1da177e2005-04-16 15:20:36 -07003084static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
3085 unsigned int buflen, int write_data)
3086{
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003087 unsigned int words = buflen >> 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003088
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003089 /* Transfer multiple of 2 bytes */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003090 if (write_data)
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003091 outsw(ap->ioaddr.data_addr, buf, words);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003092 else
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003093 insw(ap->ioaddr.data_addr, buf, words);
3094
3095 /* Transfer trailing 1 byte, if any. */
3096 if (unlikely(buflen & 0x01)) {
3097 u16 align_buf[1] = { 0 };
3098 unsigned char *trailing_buf = buf + buflen - 1;
3099
3100 if (write_data) {
3101 memcpy(align_buf, trailing_buf, 1);
3102 outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
3103 } else {
3104 align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
3105 memcpy(trailing_buf, align_buf, 1);
3106 }
3107 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003108}
3109
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003110/**
3111 * ata_data_xfer - Transfer data from/to the data register.
3112 * @ap: port to read/write
3113 * @buf: data buffer
3114 * @buflen: buffer length
3115 * @do_write: read/write
3116 *
3117 * Transfer data from/to the device data register.
3118 *
3119 * LOCKING:
3120 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003121 */
3122
Linus Torvalds1da177e2005-04-16 15:20:36 -07003123static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
3124 unsigned int buflen, int do_write)
3125{
Alan Coxa1bd9e62006-01-17 20:53:50 +00003126 /* Make the crap hardware pay the costs not the good stuff */
3127 if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
3128 unsigned long flags;
3129 local_irq_save(flags);
3130 if (ap->flags & ATA_FLAG_MMIO)
3131 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3132 else
3133 ata_pio_data_xfer(ap, buf, buflen, do_write);
3134 local_irq_restore(flags);
3135 } else {
3136 if (ap->flags & ATA_FLAG_MMIO)
3137 ata_mmio_data_xfer(ap, buf, buflen, do_write);
3138 else
3139 ata_pio_data_xfer(ap, buf, buflen, do_write);
3140 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003141}
3142
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003143/**
3144 * ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
3145 * @qc: Command on going
3146 *
3147 * Transfer ATA_SECT_SIZE of data from/to the ATA device.
3148 *
3149 * LOCKING:
3150 * Inherited from caller.
3151 */
3152
Linus Torvalds1da177e2005-04-16 15:20:36 -07003153static void ata_pio_sector(struct ata_queued_cmd *qc)
3154{
3155 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003156 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003157 struct ata_port *ap = qc->ap;
3158 struct page *page;
3159 unsigned int offset;
3160 unsigned char *buf;
3161
3162 if (qc->cursect == (qc->nsect - 1))
Albert Lee14be71f2005-09-27 17:36:35 +08003163 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003164
3165 page = sg[qc->cursg].page;
3166 offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
3167
3168 /* get the current page and offset */
3169 page = nth_page(page, (offset >> PAGE_SHIFT));
3170 offset %= PAGE_SIZE;
3171
3172 buf = kmap(page) + offset;
3173
3174 qc->cursect++;
3175 qc->cursg_ofs++;
3176
Albert Lee32529e02005-05-26 03:49:42 -04003177 if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003178 qc->cursg++;
3179 qc->cursg_ofs = 0;
3180 }
3181
3182 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3183
3184 /* do the actual data transfer */
3185 do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3186 ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
3187
3188 kunmap(page);
3189}
3190
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003191/**
3192 * __atapi_pio_bytes - Transfer data from/to the ATAPI device.
3193 * @qc: Command on going
3194 * @bytes: number of bytes
3195 *
3196 * Transfer Transfer data from/to the ATAPI device.
3197 *
3198 * LOCKING:
3199 * Inherited from caller.
3200 *
3201 */
3202
Linus Torvalds1da177e2005-04-16 15:20:36 -07003203static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
3204{
3205 int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003206 struct scatterlist *sg = qc->__sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003207 struct ata_port *ap = qc->ap;
3208 struct page *page;
3209 unsigned char *buf;
3210 unsigned int offset, count;
3211
Albert Lee563a6e12005-08-12 14:17:50 +08003212 if (qc->curbytes + bytes >= qc->nbytes)
Albert Lee14be71f2005-09-27 17:36:35 +08003213 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003214
3215next_sg:
Albert Lee563a6e12005-08-12 14:17:50 +08003216 if (unlikely(qc->cursg >= qc->n_elem)) {
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04003217 /*
Albert Lee563a6e12005-08-12 14:17:50 +08003218 * The end of qc->sg is reached and the device expects
3219 * more data to transfer. In order not to overrun qc->sg
3220 * and fulfill length specified in the byte count register,
3221 * - for read case, discard trailing data from the device
3222 * - for write case, padding zero data to the device
3223 */
3224 u16 pad_buf[1] = { 0 };
3225 unsigned int words = bytes >> 1;
3226 unsigned int i;
3227
3228 if (words) /* warning if bytes > 1 */
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04003229 printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
Albert Lee563a6e12005-08-12 14:17:50 +08003230 ap->id, bytes);
3231
3232 for (i = 0; i < words; i++)
3233 ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);
3234
Albert Lee14be71f2005-09-27 17:36:35 +08003235 ap->hsm_task_state = HSM_ST_LAST;
Albert Lee563a6e12005-08-12 14:17:50 +08003236 return;
3237 }
3238
Jeff Garzikcedc9a42005-10-05 07:13:30 -04003239 sg = &qc->__sg[qc->cursg];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003240
Linus Torvalds1da177e2005-04-16 15:20:36 -07003241 page = sg->page;
3242 offset = sg->offset + qc->cursg_ofs;
3243
3244 /* get the current page and offset */
3245 page = nth_page(page, (offset >> PAGE_SHIFT));
3246 offset %= PAGE_SIZE;
3247
Albert Lee6952df02005-06-06 15:56:03 +08003248 /* don't overrun current sg */
Albert Lee32529e02005-05-26 03:49:42 -04003249 count = min(sg->length - qc->cursg_ofs, bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003250
3251 /* don't cross page boundaries */
3252 count = min(count, (unsigned int)PAGE_SIZE - offset);
3253
3254 buf = kmap(page) + offset;
3255
3256 bytes -= count;
3257 qc->curbytes += count;
3258 qc->cursg_ofs += count;
3259
Albert Lee32529e02005-05-26 03:49:42 -04003260 if (qc->cursg_ofs == sg->length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003261 qc->cursg++;
3262 qc->cursg_ofs = 0;
3263 }
3264
3265 DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
3266
3267 /* do the actual data transfer */
3268 ata_data_xfer(ap, buf, count, do_write);
3269
3270 kunmap(page);
3271
Albert Lee563a6e12005-08-12 14:17:50 +08003272 if (bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003273 goto next_sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003274}
3275
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003276/**
3277 * atapi_pio_bytes - Transfer data from/to the ATAPI device.
3278 * @qc: Command on going
3279 *
3280 * Transfer Transfer data from/to the ATAPI device.
3281 *
3282 * LOCKING:
3283 * Inherited from caller.
Albert Lee6ae4cfb2005-08-12 14:15:34 +08003284 */
3285
Linus Torvalds1da177e2005-04-16 15:20:36 -07003286static void atapi_pio_bytes(struct ata_queued_cmd *qc)
3287{
3288 struct ata_port *ap = qc->ap;
3289 struct ata_device *dev = qc->dev;
3290 unsigned int ireason, bc_lo, bc_hi, bytes;
3291 int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
3292
3293 ap->ops->tf_read(ap, &qc->tf);
3294 ireason = qc->tf.nsect;
3295 bc_lo = qc->tf.lbam;
3296 bc_hi = qc->tf.lbah;
3297 bytes = (bc_hi << 8) | bc_lo;
3298
3299 /* shall be cleared to zero, indicating xfer of data */
3300 if (ireason & (1 << 0))
3301 goto err_out;
3302
3303 /* make sure transfer direction matches expected */
3304 i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
3305 if (do_write != i_write)
3306 goto err_out;
3307
3308 __atapi_pio_bytes(qc, bytes);
3309
3310 return;
3311
3312err_out:
3313 printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
3314 ap->id, dev->devno);
Tejun Heo11a56d22006-01-23 13:09:36 +09003315 qc->err_mask |= AC_ERR_HSM;
Albert Lee14be71f2005-09-27 17:36:35 +08003316 ap->hsm_task_state = HSM_ST_ERR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003317}
3318
3319/**
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04003320 * ata_pio_block - start PIO on a block
3321 * @ap: the target ata_port
Linus Torvalds1da177e2005-04-16 15:20:36 -07003322 *
3323 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003324 * None. (executing in kernel thread context)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003325 */
3326
3327static void ata_pio_block(struct ata_port *ap)
3328{
3329 struct ata_queued_cmd *qc;
3330 u8 status;
3331
3332 /*
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04003333 * This is purely heuristic. This is a fast path.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003334 * Sometimes when we enter, BSY will be cleared in
3335 * a chk-status or two. If not, the drive is probably seeking
3336 * or something. Snooze for a couple msecs, then
3337 * chk-status again. If still busy, fall back to
Albert Lee14be71f2005-09-27 17:36:35 +08003338 * HSM_ST_POLL state.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003339 */
3340 status = ata_busy_wait(ap, ATA_BUSY, 5);
3341 if (status & ATA_BUSY) {
3342 msleep(2);
3343 status = ata_busy_wait(ap, ATA_BUSY, 10);
3344 if (status & ATA_BUSY) {
Albert Lee14be71f2005-09-27 17:36:35 +08003345 ap->hsm_task_state = HSM_ST_POLL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003346 ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
3347 return;
3348 }
3349 }
3350
3351 qc = ata_qc_from_tag(ap, ap->active_tag);
3352 assert(qc != NULL);
3353
Albert Leefe79e682005-12-06 11:34:59 +08003354 /* check error */
3355 if (status & (ATA_ERR | ATA_DF)) {
3356 qc->err_mask |= AC_ERR_DEV;
3357 ap->hsm_task_state = HSM_ST_ERR;
3358 return;
3359 }
3360
3361 /* transfer data if any */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003362 if (is_atapi_taskfile(&qc->tf)) {
Albert Leefe79e682005-12-06 11:34:59 +08003363 /* DRQ=0 means no more data to transfer */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003364 if ((status & ATA_DRQ) == 0) {
Albert Lee14be71f2005-09-27 17:36:35 +08003365 ap->hsm_task_state = HSM_ST_LAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003366 return;
3367 }
3368
3369 atapi_pio_bytes(qc);
3370 } else {
3371 /* handle BSY=0, DRQ=0 as error */
3372 if ((status & ATA_DRQ) == 0) {
Tejun Heo11a56d22006-01-23 13:09:36 +09003373 qc->err_mask |= AC_ERR_HSM;
Albert Lee14be71f2005-09-27 17:36:35 +08003374 ap->hsm_task_state = HSM_ST_ERR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003375 return;
3376 }
3377
3378 ata_pio_sector(qc);
3379 }
3380}
3381
3382static void ata_pio_error(struct ata_port *ap)
3383{
3384 struct ata_queued_cmd *qc;
Jeff Garzika7dac442005-10-30 04:44:42 -05003385
3386 printk(KERN_WARNING "ata%u: PIO error\n", ap->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003387
3388 qc = ata_qc_from_tag(ap, ap->active_tag);
3389 assert(qc != NULL);
3390
Albert Lee1c848982005-12-05 15:40:15 +08003391 /* make sure qc->err_mask is available to
3392 * know what's wrong and recover
3393 */
3394 assert(qc->err_mask);
3395
Albert Lee14be71f2005-09-27 17:36:35 +08003396 ap->hsm_task_state = HSM_ST_IDLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003397
Albert Leea22e2eb2005-12-05 15:38:02 +08003398 ata_poll_qc_complete(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003399}
3400
3401static void ata_pio_task(void *_data)
3402{
3403 struct ata_port *ap = _data;
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04003404 unsigned long timeout;
3405 int qc_completed;
3406
3407fsm_start:
3408 timeout = 0;
3409 qc_completed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003410
Albert Lee14be71f2005-09-27 17:36:35 +08003411 switch (ap->hsm_task_state) {
3412 case HSM_ST_IDLE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003413 return;
3414
Albert Lee14be71f2005-09-27 17:36:35 +08003415 case HSM_ST:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003416 ata_pio_block(ap);
3417 break;
3418
Albert Lee14be71f2005-09-27 17:36:35 +08003419 case HSM_ST_LAST:
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04003420 qc_completed = ata_pio_complete(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003421 break;
3422
Albert Lee14be71f2005-09-27 17:36:35 +08003423 case HSM_ST_POLL:
3424 case HSM_ST_LAST_POLL:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003425 timeout = ata_pio_poll(ap);
3426 break;
3427
Albert Lee14be71f2005-09-27 17:36:35 +08003428 case HSM_ST_TMOUT:
3429 case HSM_ST_ERR:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003430 ata_pio_error(ap);
3431 return;
3432 }
3433
3434 if (timeout)
Tejun Heo95064372006-01-23 13:09:37 +09003435 ata_queue_delayed_pio_task(ap, timeout);
Jeff Garzik7fb6ec22005-09-16 06:01:48 -04003436 else if (!qc_completed)
3437 goto fsm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003438}
3439
Linus Torvalds1da177e2005-04-16 15:20:36 -07003440/**
3441 * ata_qc_timeout - Handle timeout of queued command
3442 * @qc: Command that timed out
3443 *
3444 * Some part of the kernel (currently, only the SCSI layer)
3445 * has noticed that the active command on port @ap has not
3446 * completed after a specified length of time. Handle this
3447 * condition by disabling DMA (if necessary) and completing
3448 * transactions, with error if necessary.
3449 *
3450 * This also handles the case of the "lost interrupt", where
3451 * for some reason (possibly hardware bug, possibly driver bug)
3452 * an interrupt was not delivered to the driver, even though the
3453 * transaction completed successfully.
3454 *
3455 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003456 * Inherited from SCSI layer (none, can sleep)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003457 */
3458
3459static void ata_qc_timeout(struct ata_queued_cmd *qc)
3460{
3461 struct ata_port *ap = qc->ap;
Jeff Garzikb8f61532005-08-25 22:01:20 -04003462 struct ata_host_set *host_set = ap->host_set;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003463 u8 host_stat = 0, drv_stat;
Jeff Garzikb8f61532005-08-25 22:01:20 -04003464 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003465
3466 DPRINTK("ENTER\n");
3467
Tejun Heoc18d06f2006-02-02 00:56:10 +09003468 ata_flush_pio_tasks(ap);
3469 ap->hsm_task_state = HSM_ST_IDLE;
3470
Jeff Garzikb8f61532005-08-25 22:01:20 -04003471 spin_lock_irqsave(&host_set->lock, flags);
3472
Linus Torvalds1da177e2005-04-16 15:20:36 -07003473 switch (qc->tf.protocol) {
3474
3475 case ATA_PROT_DMA:
3476 case ATA_PROT_ATAPI_DMA:
3477 host_stat = ap->ops->bmdma_status(ap);
3478
3479 /* before we do anything else, clear DMA-Start bit */
Alan Coxb73fc892005-08-26 16:03:19 +01003480 ap->ops->bmdma_stop(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003481
3482 /* fall through */
3483
3484 default:
3485 ata_altstatus(ap);
3486 drv_stat = ata_chk_status(ap);
3487
3488 /* ack bmdma irq events */
3489 ap->ops->irq_clear(ap);
3490
3491 printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
3492 ap->id, qc->tf.command, drv_stat, host_stat);
3493
3494 /* complete taskfile transaction */
Albert Leea22e2eb2005-12-05 15:38:02 +08003495 qc->err_mask |= ac_err_mask(drv_stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003496 break;
3497 }
Jeff Garzikb8f61532005-08-25 22:01:20 -04003498
3499 spin_unlock_irqrestore(&host_set->lock, flags);
3500
Tejun Heoa72ec4c2006-01-23 13:09:37 +09003501 ata_eh_qc_complete(qc);
3502
Linus Torvalds1da177e2005-04-16 15:20:36 -07003503 DPRINTK("EXIT\n");
3504}
3505
3506/**
3507 * ata_eng_timeout - Handle timeout of queued command
3508 * @ap: Port on which timed-out command is active
3509 *
3510 * Some part of the kernel (currently, only the SCSI layer)
3511 * has noticed that the active command on port @ap has not
3512 * completed after a specified length of time. Handle this
3513 * condition by disabling DMA (if necessary) and completing
3514 * transactions, with error if necessary.
3515 *
3516 * This also handles the case of the "lost interrupt", where
3517 * for some reason (possibly hardware bug, possibly driver bug)
3518 * an interrupt was not delivered to the driver, even though the
3519 * transaction completed successfully.
3520 *
3521 * LOCKING:
3522 * Inherited from SCSI layer (none, can sleep)
3523 */
3524
3525void ata_eng_timeout(struct ata_port *ap)
3526{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003527 DPRINTK("ENTER\n");
3528
Tejun Heof6379022006-02-10 15:10:48 +09003529 ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003530
Linus Torvalds1da177e2005-04-16 15:20:36 -07003531 DPRINTK("EXIT\n");
3532}
3533
3534/**
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
3538 *
3539 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003540 * None.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003541 */
3542
3543static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
3544{
3545 struct ata_queued_cmd *qc = NULL;
3546 unsigned int i;
3547
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);
3551 break;
3552 }
3553
3554 if (qc)
3555 qc->tag = i;
3556
3557 return qc;
3558}
3559
3560/**
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
3564 *
3565 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003566 * None.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003567 */
3568
3569struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
3570 struct ata_device *dev)
3571{
3572 struct ata_queued_cmd *qc;
3573
3574 qc = ata_qc_new(ap);
3575 if (qc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003576 qc->scsicmd = NULL;
3577 qc->ap = ap;
3578 qc->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003579
Jeff Garzik2c13b7c2005-11-14 14:14:16 -05003580 ata_qc_reinit(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003581 }
3582
3583 return qc;
3584}
3585
Linus Torvalds1da177e2005-04-16 15:20:36 -07003586/**
3587 * ata_qc_free - free unused ata_queued_cmd
3588 * @qc: Command to complete
3589 *
3590 * Designed to free unused ata_queued_cmd object
3591 * in case something prevents using it.
3592 *
3593 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04003594 * spin_lock_irqsave(host_set lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003595 */
3596void ata_qc_free(struct ata_queued_cmd *qc)
3597{
Tejun Heo4ba946e2006-01-23 13:09:36 +09003598 struct ata_port *ap = qc->ap;
3599 unsigned int tag;
3600
Linus Torvalds1da177e2005-04-16 15:20:36 -07003601 assert(qc != NULL); /* ata_qc_from_tag _might_ return NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003602
Tejun Heo4ba946e2006-01-23 13:09:36 +09003603 qc->flags = 0;
3604 tag = qc->tag;
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);
3610 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003611}
3612
Tejun Heo341963b2006-02-10 15:10:48 +09003613inline void __ata_qc_complete(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003614{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003615 assert(qc != NULL); /* ata_qc_from_tag _might_ return NULL */
3616 assert(qc->flags & ATA_QCFLAG_ACTIVE);
3617
3618 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
3619 ata_sg_clean(qc);
3620
Albert Lee3f3791d2005-08-16 14:25:38 +08003621 /* atapi: mark qc as inactive to prevent the interrupt handler
3622 * from completing the command twice later, before the error handler
3623 * is called. (when rc != 0 and atapi request sense is needed)
3624 */
3625 qc->flags &= ~ATA_QCFLAG_ACTIVE;
3626
Linus Torvalds1da177e2005-04-16 15:20:36 -07003627 /* call completion callback */
Tejun Heo77853bf2006-01-23 13:09:36 +09003628 qc->complete_fn(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003629}
3630
Tejun Heo341963b2006-02-10 15:10:48 +09003631/**
3632 * ata_qc_complete - Complete an active ATA command
3633 * @qc: Command to complete
3634 * @err_mask: ATA Status register contents
3635 *
3636 * Indicate to the mid and upper layers that an ATA
3637 * command has completed, with either an ok or not-ok status.
3638 *
3639 * LOCKING:
3640 * spin_lock_irqsave(host_set lock)
3641 */
3642void ata_qc_complete(struct ata_queued_cmd *qc)
3643{
3644 if (unlikely(qc->flags & ATA_QCFLAG_EH_SCHEDULED))
3645 return;
3646
3647 __ata_qc_complete(qc);
3648}
3649
Linus Torvalds1da177e2005-04-16 15:20:36 -07003650static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
3651{
3652 struct ata_port *ap = qc->ap;
3653
3654 switch (qc->tf.protocol) {
3655 case ATA_PROT_DMA:
3656 case ATA_PROT_ATAPI_DMA:
3657 return 1;
3658
3659 case ATA_PROT_ATAPI:
3660 case ATA_PROT_PIO:
3661 case ATA_PROT_PIO_MULT:
3662 if (ap->flags & ATA_FLAG_PIO_DMA)
3663 return 1;
3664
3665 /* fall through */
3666
3667 default:
3668 return 0;
3669 }
3670
3671 /* never reached */
3672}
3673
3674/**
3675 * ata_qc_issue - issue taskfile to device
3676 * @qc: command to issue to device
3677 *
3678 * Prepare an ATA command to submission to device.
3679 * This includes mapping the data into a DMA-able
3680 * area, filling in the S/G table, and finally
3681 * writing the taskfile to hardware, starting the command.
3682 *
3683 * LOCKING:
3684 * spin_lock_irqsave(host_set lock)
3685 *
3686 * RETURNS:
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09003687 * Zero on success, AC_ERR_* mask on failure
Linus Torvalds1da177e2005-04-16 15:20:36 -07003688 */
3689
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09003690unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003691{
3692 struct ata_port *ap = qc->ap;
3693
3694 if (ata_should_dma_map(qc)) {
3695 if (qc->flags & ATA_QCFLAG_SG) {
3696 if (ata_sg_setup(qc))
Tejun Heo8e436af2006-01-23 13:09:36 +09003697 goto sg_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003698 } else if (qc->flags & ATA_QCFLAG_SINGLE) {
3699 if (ata_sg_setup_one(qc))
Tejun Heo8e436af2006-01-23 13:09:36 +09003700 goto sg_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003701 }
3702 } else {
3703 qc->flags &= ~ATA_QCFLAG_DMAMAP;
3704 }
3705
3706 ap->ops->qc_prep(qc);
3707
3708 qc->ap->active_tag = qc->tag;
3709 qc->flags |= ATA_QCFLAG_ACTIVE;
3710
3711 return ap->ops->qc_issue(qc);
3712
Tejun Heo8e436af2006-01-23 13:09:36 +09003713sg_err:
3714 qc->flags &= ~ATA_QCFLAG_DMAMAP;
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09003715 return AC_ERR_SYSTEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003716}
3717
Edward Falk0baab862005-06-02 18:17:13 -04003718
Linus Torvalds1da177e2005-04-16 15:20:36 -07003719/**
3720 * ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
3721 * @qc: command to issue to device
3722 *
3723 * Using various libata functions and hooks, this function
3724 * starts an ATA command. ATA commands are grouped into
3725 * classes called "protocols", and issuing each type of protocol
3726 * is slightly different.
3727 *
Edward Falk0baab862005-06-02 18:17:13 -04003728 * May be used as the qc_issue() entry in ata_port_operations.
3729 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003730 * LOCKING:
3731 * spin_lock_irqsave(host_set lock)
3732 *
3733 * RETURNS:
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09003734 * Zero on success, AC_ERR_* mask on failure
Linus Torvalds1da177e2005-04-16 15:20:36 -07003735 */
3736
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09003737unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003738{
3739 struct ata_port *ap = qc->ap;
3740
3741 ata_dev_select(ap, qc->dev->devno, 1, 0);
3742
3743 switch (qc->tf.protocol) {
3744 case ATA_PROT_NODATA:
Jeff Garzike5338252005-10-30 21:37:17 -05003745 ata_tf_to_host(ap, &qc->tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003746 break;
3747
3748 case ATA_PROT_DMA:
3749 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
3750 ap->ops->bmdma_setup(qc); /* set up bmdma */
3751 ap->ops->bmdma_start(qc); /* initiate bmdma */
3752 break;
3753
3754 case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
3755 ata_qc_set_polling(qc);
Jeff Garzike5338252005-10-30 21:37:17 -05003756 ata_tf_to_host(ap, &qc->tf);
Albert Lee14be71f2005-09-27 17:36:35 +08003757 ap->hsm_task_state = HSM_ST;
Tejun Heo95064372006-01-23 13:09:37 +09003758 ata_queue_pio_task(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003759 break;
3760
3761 case ATA_PROT_ATAPI:
3762 ata_qc_set_polling(qc);
Jeff Garzike5338252005-10-30 21:37:17 -05003763 ata_tf_to_host(ap, &qc->tf);
Tejun Heo95064372006-01-23 13:09:37 +09003764 ata_queue_packet_task(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003765 break;
3766
3767 case ATA_PROT_ATAPI_NODATA:
Tejun Heoc1389502005-08-22 14:59:24 +09003768 ap->flags |= ATA_FLAG_NOINTR;
Jeff Garzike5338252005-10-30 21:37:17 -05003769 ata_tf_to_host(ap, &qc->tf);
Tejun Heo95064372006-01-23 13:09:37 +09003770 ata_queue_packet_task(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003771 break;
3772
3773 case ATA_PROT_ATAPI_DMA:
Tejun Heoc1389502005-08-22 14:59:24 +09003774 ap->flags |= ATA_FLAG_NOINTR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003775 ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
3776 ap->ops->bmdma_setup(qc); /* set up bmdma */
Tejun Heo95064372006-01-23 13:09:37 +09003777 ata_queue_packet_task(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003778 break;
3779
3780 default:
3781 WARN_ON(1);
Tejun Heo9a3d9eb2006-01-23 13:09:36 +09003782 return AC_ERR_SYSTEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003783 }
3784
3785 return 0;
3786}
3787
3788/**
Edward Falk0baab862005-06-02 18:17:13 -04003789 * ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
Linus Torvalds1da177e2005-04-16 15:20:36 -07003790 * @qc: Info associated with this ATA transaction.
3791 *
3792 * LOCKING:
3793 * spin_lock_irqsave(host_set lock)
3794 */
3795
3796static void ata_bmdma_setup_mmio (struct ata_queued_cmd *qc)
3797{
3798 struct ata_port *ap = qc->ap;
3799 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
3800 u8 dmactl;
3801 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
3802
3803 /* load PRD table addr. */
3804 mb(); /* make sure PRD table writes are visible to controller */
3805 writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
3806
3807 /* specify data direction, triple-check start bit is clear */
3808 dmactl = readb(mmio + ATA_DMA_CMD);
3809 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
3810 if (!rw)
3811 dmactl |= ATA_DMA_WR;
3812 writeb(dmactl, mmio + ATA_DMA_CMD);
3813
3814 /* issue r/w command */
3815 ap->ops->exec_command(ap, &qc->tf);
3816}
3817
3818/**
Alan Coxb73fc892005-08-26 16:03:19 +01003819 * ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
Linus Torvalds1da177e2005-04-16 15:20:36 -07003820 * @qc: Info associated with this ATA transaction.
3821 *
3822 * LOCKING:
3823 * spin_lock_irqsave(host_set lock)
3824 */
3825
3826static void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
3827{
3828 struct ata_port *ap = qc->ap;
3829 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
3830 u8 dmactl;
3831
3832 /* start host DMA transaction */
3833 dmactl = readb(mmio + ATA_DMA_CMD);
3834 writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
3835
3836 /* Strictly, one may wish to issue a readb() here, to
3837 * flush the mmio write. However, control also passes
3838 * to the hardware at this point, and it will interrupt
3839 * us when we are to resume control. So, in effect,
3840 * we don't care when the mmio write flushes.
3841 * Further, a read of the DMA status register _immediately_
3842 * following the write may not be what certain flaky hardware
3843 * is expected, so I think it is best to not add a readb()
3844 * without first all the MMIO ATA cards/mobos.
3845 * Or maybe I'm just being paranoid.
3846 */
3847}
3848
3849/**
3850 * ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
3851 * @qc: Info associated with this ATA transaction.
3852 *
3853 * LOCKING:
3854 * spin_lock_irqsave(host_set lock)
3855 */
3856
3857static void ata_bmdma_setup_pio (struct ata_queued_cmd *qc)
3858{
3859 struct ata_port *ap = qc->ap;
3860 unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
3861 u8 dmactl;
3862
3863 /* load PRD table addr. */
3864 outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
3865
3866 /* specify data direction, triple-check start bit is clear */
3867 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3868 dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
3869 if (!rw)
3870 dmactl |= ATA_DMA_WR;
3871 outb(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3872
3873 /* issue r/w command */
3874 ap->ops->exec_command(ap, &qc->tf);
3875}
3876
3877/**
3878 * ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
3879 * @qc: Info associated with this ATA transaction.
3880 *
3881 * LOCKING:
3882 * spin_lock_irqsave(host_set lock)
3883 */
3884
3885static void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
3886{
3887 struct ata_port *ap = qc->ap;
3888 u8 dmactl;
3889
3890 /* start host DMA transaction */
3891 dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3892 outb(dmactl | ATA_DMA_START,
3893 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
3894}
3895
Edward Falk0baab862005-06-02 18:17:13 -04003896
3897/**
3898 * ata_bmdma_start - Start a PCI IDE BMDMA transaction
3899 * @qc: Info associated with this ATA transaction.
3900 *
3901 * Writes the ATA_DMA_START flag to the DMA command register.
3902 *
3903 * May be used as the bmdma_start() entry in ata_port_operations.
3904 *
3905 * LOCKING:
3906 * spin_lock_irqsave(host_set lock)
3907 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003908void ata_bmdma_start(struct ata_queued_cmd *qc)
3909{
3910 if (qc->ap->flags & ATA_FLAG_MMIO)
3911 ata_bmdma_start_mmio(qc);
3912 else
3913 ata_bmdma_start_pio(qc);
3914}
3915
Edward Falk0baab862005-06-02 18:17:13 -04003916
3917/**
3918 * ata_bmdma_setup - Set up PCI IDE BMDMA transaction
3919 * @qc: Info associated with this ATA transaction.
3920 *
3921 * Writes address of PRD table to device's PRD Table Address
3922 * register, sets the DMA control register, and calls
3923 * ops->exec_command() to start the transfer.
3924 *
3925 * May be used as the bmdma_setup() entry in ata_port_operations.
3926 *
3927 * LOCKING:
3928 * spin_lock_irqsave(host_set lock)
3929 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003930void ata_bmdma_setup(struct ata_queued_cmd *qc)
3931{
3932 if (qc->ap->flags & ATA_FLAG_MMIO)
3933 ata_bmdma_setup_mmio(qc);
3934 else
3935 ata_bmdma_setup_pio(qc);
3936}
3937
Edward Falk0baab862005-06-02 18:17:13 -04003938
3939/**
3940 * ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
Jeff Garzikdecc6d02005-06-02 18:42:33 -04003941 * @ap: Port associated with this ATA transaction.
Edward Falk0baab862005-06-02 18:17:13 -04003942 *
3943 * Clear interrupt and error flags in DMA status register.
3944 *
3945 * May be used as the irq_clear() entry in ata_port_operations.
3946 *
3947 * LOCKING:
3948 * spin_lock_irqsave(host_set lock)
3949 */
3950
Linus Torvalds1da177e2005-04-16 15:20:36 -07003951void ata_bmdma_irq_clear(struct ata_port *ap)
3952{
3953 if (ap->flags & ATA_FLAG_MMIO) {
3954 void __iomem *mmio = ((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
3955 writeb(readb(mmio), mmio);
3956 } else {
3957 unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
3958 outb(inb(addr), addr);
3959 }
3960
3961}
3962
Edward Falk0baab862005-06-02 18:17:13 -04003963
3964/**
3965 * ata_bmdma_status - Read PCI IDE BMDMA status
Jeff Garzikdecc6d02005-06-02 18:42:33 -04003966 * @ap: Port associated with this ATA transaction.
Edward Falk0baab862005-06-02 18:17:13 -04003967 *
3968 * Read and return BMDMA status register.
3969 *
3970 * May be used as the bmdma_status() entry in ata_port_operations.
3971 *
3972 * LOCKING:
3973 * spin_lock_irqsave(host_set lock)
3974 */
3975
Linus Torvalds1da177e2005-04-16 15:20:36 -07003976u8 ata_bmdma_status(struct ata_port *ap)
3977{
3978 u8 host_stat;
3979 if (ap->flags & ATA_FLAG_MMIO) {
3980 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
3981 host_stat = readb(mmio + ATA_DMA_STATUS);
3982 } else
Albert Leeee500aa2005-09-27 17:34:38 +08003983 host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003984 return host_stat;
3985}
3986
Edward Falk0baab862005-06-02 18:17:13 -04003987
3988/**
3989 * ata_bmdma_stop - Stop PCI IDE BMDMA transfer
Alan Coxb73fc892005-08-26 16:03:19 +01003990 * @qc: Command we are ending DMA for
Edward Falk0baab862005-06-02 18:17:13 -04003991 *
3992 * Clears the ATA_DMA_START flag in the dma control register
3993 *
3994 * May be used as the bmdma_stop() entry in ata_port_operations.
3995 *
3996 * LOCKING:
3997 * spin_lock_irqsave(host_set lock)
3998 */
3999
Alan Coxb73fc892005-08-26 16:03:19 +01004000void ata_bmdma_stop(struct ata_queued_cmd *qc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004001{
Alan Coxb73fc892005-08-26 16:03:19 +01004002 struct ata_port *ap = qc->ap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004003 if (ap->flags & ATA_FLAG_MMIO) {
4004 void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
4005
4006 /* clear start/stop bit */
4007 writeb(readb(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
4008 mmio + ATA_DMA_CMD);
4009 } else {
4010 /* clear start/stop bit */
4011 outb(inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD) & ~ATA_DMA_START,
4012 ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
4013 }
4014
4015 /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
4016 ata_altstatus(ap); /* dummy read */
4017}
4018
4019/**
4020 * ata_host_intr - Handle host interrupt for given (port, task)
4021 * @ap: Port on which interrupt arrived (possibly...)
4022 * @qc: Taskfile currently active in engine
4023 *
4024 * Handle host interrupt for given queued command. Currently,
4025 * only DMA interrupts are handled. All other commands are
4026 * handled via polling with interrupts disabled (nIEN bit).
4027 *
4028 * LOCKING:
4029 * spin_lock_irqsave(host_set lock)
4030 *
4031 * RETURNS:
4032 * One if interrupt was handled, zero if not (shared irq).
4033 */
4034
4035inline unsigned int ata_host_intr (struct ata_port *ap,
4036 struct ata_queued_cmd *qc)
4037{
4038 u8 status, host_stat;
4039
4040 switch (qc->tf.protocol) {
4041
4042 case ATA_PROT_DMA:
4043 case ATA_PROT_ATAPI_DMA:
4044 case ATA_PROT_ATAPI:
4045 /* check status of DMA engine */
4046 host_stat = ap->ops->bmdma_status(ap);
4047 VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
4048
4049 /* if it's not our irq... */
4050 if (!(host_stat & ATA_DMA_INTR))
4051 goto idle_irq;
4052
4053 /* before we do anything else, clear DMA-Start bit */
Alan Coxb73fc892005-08-26 16:03:19 +01004054 ap->ops->bmdma_stop(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004055
4056 /* fall through */
4057
4058 case ATA_PROT_ATAPI_NODATA:
4059 case ATA_PROT_NODATA:
4060 /* check altstatus */
4061 status = ata_altstatus(ap);
4062 if (status & ATA_BUSY)
4063 goto idle_irq;
4064
4065 /* check main status, clearing INTRQ */
4066 status = ata_chk_status(ap);
4067 if (unlikely(status & ATA_BUSY))
4068 goto idle_irq;
4069 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
4070 ap->id, qc->tf.protocol, status);
4071
4072 /* ack bmdma irq events */
4073 ap->ops->irq_clear(ap);
4074
4075 /* complete taskfile transaction */
Albert Leea22e2eb2005-12-05 15:38:02 +08004076 qc->err_mask |= ac_err_mask(status);
4077 ata_qc_complete(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004078 break;
4079
4080 default:
4081 goto idle_irq;
4082 }
4083
4084 return 1; /* irq handled */
4085
4086idle_irq:
4087 ap->stats.idle_irq++;
4088
4089#ifdef ATA_IRQ_TRAP
4090 if ((ap->stats.idle_irq % 1000) == 0) {
4091 handled = 1;
4092 ata_irq_ack(ap, 0); /* debug trap */
4093 printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
4094 }
4095#endif
4096 return 0; /* irq not handled */
4097}
4098
4099/**
4100 * ata_interrupt - Default ATA host interrupt handler
Jeff Garzik0cba6322005-05-30 19:49:12 -04004101 * @irq: irq line (unused)
4102 * @dev_instance: pointer to our ata_host_set information structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07004103 * @regs: unused
4104 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04004105 * Default interrupt handler for PCI IDE devices. Calls
4106 * ata_host_intr() for each port that is not disabled.
4107 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004108 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004109 * Obtains host_set lock during operation.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004110 *
4111 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004112 * IRQ_NONE or IRQ_HANDLED.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004113 */
4114
4115irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
4116{
4117 struct ata_host_set *host_set = dev_instance;
4118 unsigned int i;
4119 unsigned int handled = 0;
4120 unsigned long flags;
4121
4122 /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
4123 spin_lock_irqsave(&host_set->lock, flags);
4124
4125 for (i = 0; i < host_set->n_ports; i++) {
4126 struct ata_port *ap;
4127
4128 ap = host_set->ports[i];
Tejun Heoc1389502005-08-22 14:59:24 +09004129 if (ap &&
4130 !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004131 struct ata_queued_cmd *qc;
4132
4133 qc = ata_qc_from_tag(ap, ap->active_tag);
Albert Lee21b1ed72005-04-29 17:34:59 +08004134 if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
4135 (qc->flags & ATA_QCFLAG_ACTIVE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004136 handled |= ata_host_intr(ap, qc);
4137 }
4138 }
4139
4140 spin_unlock_irqrestore(&host_set->lock, flags);
4141
4142 return IRQ_RETVAL(handled);
4143}
4144
4145/**
4146 * atapi_packet_task - Write CDB bytes to hardware
4147 * @_data: Port to which ATAPI device is attached.
4148 *
4149 * When device has indicated its readiness to accept
4150 * a CDB, this function is called. Send the CDB.
4151 * If DMA is to be performed, exit immediately.
4152 * Otherwise, we are in polling mode, so poll
4153 * status under operation succeeds or fails.
4154 *
4155 * LOCKING:
4156 * Kernel thread context (may sleep)
4157 */
4158
4159static void atapi_packet_task(void *_data)
4160{
4161 struct ata_port *ap = _data;
4162 struct ata_queued_cmd *qc;
4163 u8 status;
4164
4165 qc = ata_qc_from_tag(ap, ap->active_tag);
4166 assert(qc != NULL);
4167 assert(qc->flags & ATA_QCFLAG_ACTIVE);
4168
4169 /* sleep-wait for BSY to clear */
4170 DPRINTK("busy wait\n");
Albert Leed8fe4522005-12-05 15:42:17 +08004171 if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
Tejun Heo11a56d22006-01-23 13:09:36 +09004172 qc->err_mask |= AC_ERR_TIMEOUT;
Albert Leed8fe4522005-12-05 15:42:17 +08004173 goto err_out;
4174 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004175
4176 /* make sure DRQ is set */
4177 status = ata_chk_status(ap);
Albert Leed8fe4522005-12-05 15:42:17 +08004178 if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
Tejun Heo11a56d22006-01-23 13:09:36 +09004179 qc->err_mask |= AC_ERR_HSM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004180 goto err_out;
Albert Leed8fe4522005-12-05 15:42:17 +08004181 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004182
4183 /* send SCSI cdb */
4184 DPRINTK("send cdb\n");
4185 assert(ap->cdb_len >= 12);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004186
Tejun Heoc1389502005-08-22 14:59:24 +09004187 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
4188 qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
4189 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004190
Tejun Heoc1389502005-08-22 14:59:24 +09004191 /* Once we're done issuing command and kicking bmdma,
4192 * irq handler takes over. To not lose irq, we need
4193 * to clear NOINTR flag before sending cdb, but
4194 * interrupt handler shouldn't be invoked before we're
4195 * finished. Hence, the following locking.
4196 */
4197 spin_lock_irqsave(&ap->host_set->lock, flags);
4198 ap->flags &= ~ATA_FLAG_NOINTR;
4199 ata_data_xfer(ap, qc->cdb, ap->cdb_len, 1);
4200 if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
4201 ap->ops->bmdma_start(qc); /* initiate bmdma */
4202 spin_unlock_irqrestore(&ap->host_set->lock, flags);
4203 } else {
4204 ata_data_xfer(ap, qc->cdb, ap->cdb_len, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004205
Tejun Heoc1389502005-08-22 14:59:24 +09004206 /* PIO commands are handled by polling */
Albert Lee14be71f2005-09-27 17:36:35 +08004207 ap->hsm_task_state = HSM_ST;
Tejun Heo95064372006-01-23 13:09:37 +09004208 ata_queue_pio_task(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004209 }
4210
4211 return;
4212
4213err_out:
Albert Leea22e2eb2005-12-05 15:38:02 +08004214 ata_poll_qc_complete(qc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004215}
4216
Edward Falk0baab862005-06-02 18:17:13 -04004217
Jens Axboe9b847542006-01-06 09:28:07 +01004218/*
4219 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
4220 * without filling any other registers
4221 */
4222static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
4223 u8 cmd)
4224{
4225 struct ata_taskfile tf;
4226 int err;
4227
4228 ata_tf_init(ap, &tf, dev->devno);
4229
4230 tf.command = cmd;
4231 tf.flags |= ATA_TFLAG_DEVICE;
4232 tf.protocol = ATA_PROT_NODATA;
4233
4234 err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
4235 if (err)
4236 printk(KERN_ERR "%s: ata command failed: %d\n",
4237 __FUNCTION__, err);
4238
4239 return err;
4240}
4241
4242static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
4243{
4244 u8 cmd;
4245
4246 if (!ata_try_flush_cache(dev))
4247 return 0;
4248
4249 if (ata_id_has_flush_ext(dev->id))
4250 cmd = ATA_CMD_FLUSH_EXT;
4251 else
4252 cmd = ATA_CMD_FLUSH;
4253
4254 return ata_do_simple_cmd(ap, dev, cmd);
4255}
4256
4257static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
4258{
4259 return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
4260}
4261
4262static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
4263{
4264 return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
4265}
4266
4267/**
4268 * ata_device_resume - wakeup a previously suspended devices
Randy Dunlapc893a3a2006-01-28 13:15:32 -05004269 * @ap: port the device is connected to
4270 * @dev: the device to resume
Jens Axboe9b847542006-01-06 09:28:07 +01004271 *
4272 * Kick the drive back into action, by sending it an idle immediate
4273 * command and making sure its transfer mode matches between drive
4274 * and host.
4275 *
4276 */
4277int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
4278{
4279 if (ap->flags & ATA_FLAG_SUSPENDED) {
4280 ap->flags &= ~ATA_FLAG_SUSPENDED;
4281 ata_set_mode(ap);
4282 }
4283 if (!ata_dev_present(dev))
4284 return 0;
4285 if (dev->class == ATA_DEV_ATA)
4286 ata_start_drive(ap, dev);
4287
4288 return 0;
4289}
4290
4291/**
4292 * ata_device_suspend - prepare a device for suspend
Randy Dunlapc893a3a2006-01-28 13:15:32 -05004293 * @ap: port the device is connected to
4294 * @dev: the device to suspend
Jens Axboe9b847542006-01-06 09:28:07 +01004295 *
4296 * Flush the cache on the drive, if appropriate, then issue a
4297 * standbynow command.
Jens Axboe9b847542006-01-06 09:28:07 +01004298 */
4299int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
4300{
4301 if (!ata_dev_present(dev))
4302 return 0;
4303 if (dev->class == ATA_DEV_ATA)
4304 ata_flush_cache(ap, dev);
4305
4306 ata_standby_drive(ap, dev);
4307 ap->flags |= ATA_FLAG_SUSPENDED;
4308 return 0;
4309}
4310
Randy Dunlapc893a3a2006-01-28 13:15:32 -05004311/**
4312 * ata_port_start - Set port up for dma.
4313 * @ap: Port to initialize
4314 *
4315 * Called just after data structures for each port are
4316 * initialized. Allocates space for PRD table.
4317 *
4318 * May be used as the port_start() entry in ata_port_operations.
4319 *
4320 * LOCKING:
4321 * Inherited from caller.
4322 */
4323
Linus Torvalds1da177e2005-04-16 15:20:36 -07004324int ata_port_start (struct ata_port *ap)
4325{
4326 struct device *dev = ap->host_set->dev;
Jeff Garzik6037d6b2005-11-04 22:08:00 -05004327 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004328
4329 ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
4330 if (!ap->prd)
4331 return -ENOMEM;
4332
Jeff Garzik6037d6b2005-11-04 22:08:00 -05004333 rc = ata_pad_alloc(ap, dev);
4334 if (rc) {
Jeff Garzikcedc9a42005-10-05 07:13:30 -04004335 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
Jeff Garzik6037d6b2005-11-04 22:08:00 -05004336 return rc;
Jeff Garzikcedc9a42005-10-05 07:13:30 -04004337 }
4338
Linus Torvalds1da177e2005-04-16 15:20:36 -07004339 DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
4340
4341 return 0;
4342}
4343
Edward Falk0baab862005-06-02 18:17:13 -04004344
4345/**
4346 * ata_port_stop - Undo ata_port_start()
4347 * @ap: Port to shut down
4348 *
4349 * Frees the PRD table.
4350 *
4351 * May be used as the port_stop() entry in ata_port_operations.
4352 *
4353 * LOCKING:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04004354 * Inherited from caller.
Edward Falk0baab862005-06-02 18:17:13 -04004355 */
4356
Linus Torvalds1da177e2005-04-16 15:20:36 -07004357void ata_port_stop (struct ata_port *ap)
4358{
4359 struct device *dev = ap->host_set->dev;
4360
4361 dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
Jeff Garzik6037d6b2005-11-04 22:08:00 -05004362 ata_pad_free(ap, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004363}
4364
Jeff Garzikaa8f0dc2005-05-26 21:54:27 -04004365void ata_host_stop (struct ata_host_set *host_set)
4366{
4367 if (host_set->mmio_base)
4368 iounmap(host_set->mmio_base);
4369}
4370
4371
Linus Torvalds1da177e2005-04-16 15:20:36 -07004372/**
4373 * ata_host_remove - Unregister SCSI host structure with upper layers
4374 * @ap: Port to unregister
4375 * @do_unregister: 1 if we fully unregister, 0 to just stop the port
4376 *
4377 * LOCKING:
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04004378 * Inherited from caller.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004379 */
4380
4381static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
4382{
4383 struct Scsi_Host *sh = ap->host;
4384
4385 DPRINTK("ENTER\n");
4386
4387 if (do_unregister)
4388 scsi_remove_host(sh);
4389
4390 ap->ops->port_stop(ap);
4391}
4392
4393/**
4394 * ata_host_init - Initialize an ata_port structure
4395 * @ap: Structure to initialize
4396 * @host: associated SCSI mid-layer structure
4397 * @host_set: Collection of hosts to which @ap belongs
4398 * @ent: Probe information provided by low-level driver
4399 * @port_no: Port number associated with this ata_port
4400 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04004401 * Initialize a new ata_port structure, and its associated
4402 * scsi_host.
4403 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004404 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004405 * Inherited from caller.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004406 */
4407
4408static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
4409 struct ata_host_set *host_set,
Jeff Garzik057ace52005-10-22 14:27:05 -04004410 const struct ata_probe_ent *ent, unsigned int port_no)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004411{
4412 unsigned int i;
4413
4414 host->max_id = 16;
4415 host->max_lun = 1;
4416 host->max_channel = 1;
4417 host->unique_id = ata_unique_id++;
4418 host->max_cmd_len = 12;
Christoph Hellwig12413192005-06-11 01:05:01 +02004419
Linus Torvalds1da177e2005-04-16 15:20:36 -07004420 ap->flags = ATA_FLAG_PORT_DISABLED;
4421 ap->id = host->unique_id;
4422 ap->host = host;
4423 ap->ctl = ATA_DEVCTL_OBS;
4424 ap->host_set = host_set;
4425 ap->port_no = port_no;
4426 ap->hard_port_no =
4427 ent->legacy_mode ? ent->hard_port_no : port_no;
4428 ap->pio_mask = ent->pio_mask;
4429 ap->mwdma_mask = ent->mwdma_mask;
4430 ap->udma_mask = ent->udma_mask;
4431 ap->flags |= ent->host_flags;
4432 ap->ops = ent->port_ops;
4433 ap->cbl = ATA_CBL_NONE;
4434 ap->active_tag = ATA_TAG_POISON;
4435 ap->last_ctl = 0xFF;
4436
4437 INIT_WORK(&ap->packet_task, atapi_packet_task, ap);
4438 INIT_WORK(&ap->pio_task, ata_pio_task, ap);
Tejun Heoa72ec4c2006-01-23 13:09:37 +09004439 INIT_LIST_HEAD(&ap->eh_done_q);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004440
4441 for (i = 0; i < ATA_MAX_DEVICES; i++)
4442 ap->device[i].devno = i;
4443
4444#ifdef ATA_IRQ_TRAP
4445 ap->stats.unhandled_irq = 1;
4446 ap->stats.idle_irq = 1;
4447#endif
4448
4449 memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
4450}
4451
4452/**
4453 * ata_host_add - Attach low-level ATA driver to system
4454 * @ent: Information provided by low-level driver
4455 * @host_set: Collections of ports to which we add
4456 * @port_no: Port number associated with this host
4457 *
Jeff Garzik0cba6322005-05-30 19:49:12 -04004458 * Attach low-level ATA driver to system.
4459 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004460 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004461 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004462 *
4463 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004464 * New ata_port on success, for NULL on error.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004465 */
4466
Jeff Garzik057ace52005-10-22 14:27:05 -04004467static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004468 struct ata_host_set *host_set,
4469 unsigned int port_no)
4470{
4471 struct Scsi_Host *host;
4472 struct ata_port *ap;
4473 int rc;
4474
4475 DPRINTK("ENTER\n");
4476 host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
4477 if (!host)
4478 return NULL;
4479
4480 ap = (struct ata_port *) &host->hostdata[0];
4481
4482 ata_host_init(ap, host, host_set, ent, port_no);
4483
4484 rc = ap->ops->port_start(ap);
4485 if (rc)
4486 goto err_out;
4487
4488 return ap;
4489
4490err_out:
4491 scsi_host_put(host);
4492 return NULL;
4493}
4494
4495/**
Jeff Garzik0cba6322005-05-30 19:49:12 -04004496 * ata_device_add - Register hardware device with ATA and SCSI layers
4497 * @ent: Probe information describing hardware device to be registered
4498 *
4499 * This function processes the information provided in the probe
4500 * information struct @ent, allocates the necessary ATA and SCSI
4501 * host information structures, initializes them, and registers
4502 * everything with requisite kernel subsystems.
4503 *
4504 * This function requests irqs, probes the ATA bus, and probes
4505 * the SCSI bus.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004506 *
4507 * LOCKING:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004508 * PCI/etc. bus probe sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004509 *
4510 * RETURNS:
Jeff Garzik0cba6322005-05-30 19:49:12 -04004511 * Number of ports registered. Zero on error (no ports registered).
Linus Torvalds1da177e2005-04-16 15:20:36 -07004512 */
4513
Jeff Garzik057ace52005-10-22 14:27:05 -04004514int ata_device_add(const struct ata_probe_ent *ent)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004515{
4516 unsigned int count = 0, i;
4517 struct device *dev = ent->dev;
4518 struct ata_host_set *host_set;
4519
4520 DPRINTK("ENTER\n");
4521 /* alloc a container for our list of ATA ports (buses) */
Randy Dunlap57f3bda2005-10-28 20:37:23 -07004522 host_set = kzalloc(sizeof(struct ata_host_set) +
Linus Torvalds1da177e2005-04-16 15:20:36 -07004523 (ent->n_ports * sizeof(void *)), GFP_KERNEL);
4524 if (!host_set)
4525 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004526 spin_lock_init(&host_set->lock);
4527
4528 host_set->dev = dev;
4529 host_set->n_ports = ent->n_ports;
4530 host_set->irq = ent->irq;
4531 host_set->mmio_base = ent->mmio_base;
4532 host_set->private_data = ent->private_data;
4533 host_set->ops = ent->port_ops;
4534
4535 /* register each port bound to this device */
4536 for (i = 0; i < ent->n_ports; i++) {
4537 struct ata_port *ap;
4538 unsigned long xfer_mode_mask;
4539
4540 ap = ata_host_add(ent, host_set, i);
4541 if (!ap)
4542 goto err_out;
4543
4544 host_set->ports[i] = ap;
4545 xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
4546 (ap->mwdma_mask << ATA_SHIFT_MWDMA) |
4547 (ap->pio_mask << ATA_SHIFT_PIO);
4548
4549 /* print per-port info to dmesg */
4550 printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
4551 "bmdma 0x%lX irq %lu\n",
4552 ap->id,
4553 ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
4554 ata_mode_string(xfer_mode_mask),
4555 ap->ioaddr.cmd_addr,
4556 ap->ioaddr.ctl_addr,
4557 ap->ioaddr.bmdma_addr,
4558 ent->irq);
4559
4560 ata_chk_status(ap);
4561 host_set->ops->irq_clear(ap);
4562 count++;
4563 }
4564
Randy Dunlap57f3bda2005-10-28 20:37:23 -07004565 if (!count)
4566 goto err_free_ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004567
4568 /* obtain irq, that is shared between channels */
4569 if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
4570 DRV_NAME, host_set))
4571 goto err_out;
4572
4573 /* perform each probe synchronously */
4574 DPRINTK("probe begin\n");
4575 for (i = 0; i < count; i++) {
4576 struct ata_port *ap;
4577 int rc;
4578
4579 ap = host_set->ports[i];
4580
Randy Dunlapc893a3a2006-01-28 13:15:32 -05004581 DPRINTK("ata%u: bus probe begin\n", ap->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004582 rc = ata_bus_probe(ap);
Randy Dunlapc893a3a2006-01-28 13:15:32 -05004583 DPRINTK("ata%u: bus probe end\n", ap->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004584
4585 if (rc) {
4586 /* FIXME: do something useful here?
4587 * Current libata behavior will
4588 * tear down everything when
4589 * the module is removed
4590 * or the h/w is unplugged.
4591 */
4592 }
4593
4594 rc = scsi_add_host(ap->host, dev);
4595 if (rc) {
4596 printk(KERN_ERR "ata%u: scsi_add_host failed\n",
4597 ap->id);
4598 /* FIXME: do something useful here */
4599 /* FIXME: handle unconditional calls to
4600 * scsi_scan_host and ata_host_remove, below,
4601 * at the very least
4602 */
4603 }
4604 }
4605
4606 /* probes are done, now scan each port's disk(s) */
Randy Dunlapc893a3a2006-01-28 13:15:32 -05004607 DPRINTK("host probe begin\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004608 for (i = 0; i < count; i++) {
4609 struct ata_port *ap = host_set->ports[i];
4610
Jeff Garzik644dd0c2005-10-03 15:55:19 -04004611 ata_scsi_scan_host(ap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004612 }
4613
4614 dev_set_drvdata(dev, host_set);
4615
4616 VPRINTK("EXIT, returning %u\n", ent->n_ports);
4617 return ent->n_ports; /* success */
4618
4619err_out:
4620 for (i = 0; i < count; i++) {
4621 ata_host_remove(host_set->ports[i], 1);
4622 scsi_host_put(host_set->ports[i]->host);
4623 }
Randy Dunlap57f3bda2005-10-28 20:37:23 -07004624err_free_ret:
Linus Torvalds1da177e2005-04-16 15:20:36 -07004625 kfree(host_set);
4626 VPRINTK("EXIT, returning 0\n");
4627 return 0;
4628}
4629
4630/**
Alan Cox17b14452005-09-15 15:44:00 +01004631 * ata_host_set_remove - PCI layer callback for device removal
4632 * @host_set: ATA host set that was removed
4633 *
4634 * Unregister all objects associated with this host set. Free those
4635 * objects.
4636 *
4637 * LOCKING:
4638 * Inherited from calling layer (may sleep).
4639 */
4640
Alan Cox17b14452005-09-15 15:44:00 +01004641void ata_host_set_remove(struct ata_host_set *host_set)
4642{
4643 struct ata_port *ap;
4644 unsigned int i;
4645
4646 for (i = 0; i < host_set->n_ports; i++) {
4647 ap = host_set->ports[i];
4648 scsi_remove_host(ap->host);
4649 }
4650
4651 free_irq(host_set->irq, host_set);
4652
4653 for (i = 0; i < host_set->n_ports; i++) {
4654 ap = host_set->ports[i];
4655
4656 ata_scsi_release(ap->host);
4657
4658 if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
4659 struct ata_ioports *ioaddr = &ap->ioaddr;
4660
4661 if (ioaddr->cmd_addr == 0x1f0)
4662 release_region(0x1f0, 8);
4663 else if (ioaddr->cmd_addr == 0x170)
4664 release_region(0x170, 8);
4665 }
4666
4667 scsi_host_put(ap->host);
4668 }
4669
4670 if (host_set->ops->host_stop)
4671 host_set->ops->host_stop(host_set);
4672
4673 kfree(host_set);
4674}
4675
4676/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07004677 * ata_scsi_release - SCSI layer callback hook for host unload
4678 * @host: libata host to be unloaded
4679 *
4680 * Performs all duties necessary to shut down a libata port...
4681 * Kill port kthread, disable port, and release resources.
4682 *
4683 * LOCKING:
4684 * Inherited from SCSI layer.
4685 *
4686 * RETURNS:
4687 * One.
4688 */
4689
4690int ata_scsi_release(struct Scsi_Host *host)
4691{
4692 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4693
4694 DPRINTK("ENTER\n");
4695
4696 ap->ops->port_disable(ap);
4697 ata_host_remove(ap, 0);
4698
4699 DPRINTK("EXIT\n");
4700 return 1;
4701}
4702
4703/**
4704 * ata_std_ports - initialize ioaddr with standard port offsets.
4705 * @ioaddr: IO address structure to be initialized
Edward Falk0baab862005-06-02 18:17:13 -04004706 *
4707 * Utility function which initializes data_addr, error_addr,
4708 * feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
4709 * device_addr, status_addr, and command_addr to standard offsets
4710 * relative to cmd_addr.
4711 *
4712 * Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004713 */
Edward Falk0baab862005-06-02 18:17:13 -04004714
Linus Torvalds1da177e2005-04-16 15:20:36 -07004715void ata_std_ports(struct ata_ioports *ioaddr)
4716{
4717 ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
4718 ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
4719 ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
4720 ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
4721 ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
4722 ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
4723 ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
4724 ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
4725 ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
4726 ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
4727}
4728
Edward Falk0baab862005-06-02 18:17:13 -04004729
Jeff Garzik374b1872005-08-30 05:42:52 -04004730#ifdef CONFIG_PCI
4731
4732void ata_pci_host_stop (struct ata_host_set *host_set)
4733{
4734 struct pci_dev *pdev = to_pci_dev(host_set->dev);
4735
4736 pci_iounmap(pdev, host_set->mmio_base);
4737}
4738
Edward Falk0baab862005-06-02 18:17:13 -04004739/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07004740 * ata_pci_remove_one - PCI layer callback for device removal
4741 * @pdev: PCI device that was removed
4742 *
4743 * PCI layer indicates to libata via this hook that
Randy Dunlap6f0ef4f2005-10-25 01:44:30 -04004744 * hot-unplug or module unload event has occurred.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004745 * Handle this by unregistering all objects associated
4746 * with this PCI device. Free those objects. Then finally
4747 * release PCI resources and disable device.
4748 *
4749 * LOCKING:
4750 * Inherited from PCI layer (may sleep).
4751 */
4752
4753void ata_pci_remove_one (struct pci_dev *pdev)
4754{
4755 struct device *dev = pci_dev_to_dev(pdev);
4756 struct ata_host_set *host_set = dev_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004757
Alan Cox17b14452005-09-15 15:44:00 +01004758 ata_host_set_remove(host_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004759 pci_release_regions(pdev);
4760 pci_disable_device(pdev);
4761 dev_set_drvdata(dev, NULL);
4762}
4763
4764/* move to PCI subsystem */
Jeff Garzik057ace52005-10-22 14:27:05 -04004765int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004766{
4767 unsigned long tmp = 0;
4768
4769 switch (bits->width) {
4770 case 1: {
4771 u8 tmp8 = 0;
4772 pci_read_config_byte(pdev, bits->reg, &tmp8);
4773 tmp = tmp8;
4774 break;
4775 }
4776 case 2: {
4777 u16 tmp16 = 0;
4778 pci_read_config_word(pdev, bits->reg, &tmp16);
4779 tmp = tmp16;
4780 break;
4781 }
4782 case 4: {
4783 u32 tmp32 = 0;
4784 pci_read_config_dword(pdev, bits->reg, &tmp32);
4785 tmp = tmp32;
4786 break;
4787 }
4788
4789 default:
4790 return -EINVAL;
4791 }
4792
4793 tmp &= bits->mask;
4794
4795 return (tmp == bits->val) ? 1 : 0;
4796}
Jens Axboe9b847542006-01-06 09:28:07 +01004797
4798int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
4799{
4800 pci_save_state(pdev);
4801 pci_disable_device(pdev);
4802 pci_set_power_state(pdev, PCI_D3hot);
4803 return 0;
4804}
4805
4806int ata_pci_device_resume(struct pci_dev *pdev)
4807{
4808 pci_set_power_state(pdev, PCI_D0);
4809 pci_restore_state(pdev);
4810 pci_enable_device(pdev);
4811 pci_set_master(pdev);
4812 return 0;
4813}
Linus Torvalds1da177e2005-04-16 15:20:36 -07004814#endif /* CONFIG_PCI */
4815
4816
Linus Torvalds1da177e2005-04-16 15:20:36 -07004817static int __init ata_init(void)
4818{
4819 ata_wq = create_workqueue("ata");
4820 if (!ata_wq)
4821 return -ENOMEM;
4822
4823 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
4824 return 0;
4825}
4826
4827static void __exit ata_exit(void)
4828{
4829 destroy_workqueue(ata_wq);
4830}
4831
4832module_init(ata_init);
4833module_exit(ata_exit);
4834
Jeff Garzik67846b32005-10-05 02:58:32 -04004835static unsigned long ratelimit_time;
4836static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;
4837
4838int ata_ratelimit(void)
4839{
4840 int rc;
4841 unsigned long flags;
4842
4843 spin_lock_irqsave(&ata_ratelimit_lock, flags);
4844
4845 if (time_after(jiffies, ratelimit_time)) {
4846 rc = 1;
4847 ratelimit_time = jiffies + (HZ/5);
4848 } else
4849 rc = 0;
4850
4851 spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
4852
4853 return rc;
4854}
4855
Linus Torvalds1da177e2005-04-16 15:20:36 -07004856/*
4857 * libata is essentially a library of internal helper functions for
4858 * low-level ATA host controller drivers. As such, the API/ABI is
4859 * likely to change as new drivers are added and updated.
4860 * Do not depend on ABI/API stability.
4861 */
4862
4863EXPORT_SYMBOL_GPL(ata_std_bios_param);
4864EXPORT_SYMBOL_GPL(ata_std_ports);
4865EXPORT_SYMBOL_GPL(ata_device_add);
Alan Cox17b14452005-09-15 15:44:00 +01004866EXPORT_SYMBOL_GPL(ata_host_set_remove);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004867EXPORT_SYMBOL_GPL(ata_sg_init);
4868EXPORT_SYMBOL_GPL(ata_sg_init_one);
4869EXPORT_SYMBOL_GPL(ata_qc_complete);
4870EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
4871EXPORT_SYMBOL_GPL(ata_eng_timeout);
4872EXPORT_SYMBOL_GPL(ata_tf_load);
4873EXPORT_SYMBOL_GPL(ata_tf_read);
4874EXPORT_SYMBOL_GPL(ata_noop_dev_select);
4875EXPORT_SYMBOL_GPL(ata_std_dev_select);
4876EXPORT_SYMBOL_GPL(ata_tf_to_fis);
4877EXPORT_SYMBOL_GPL(ata_tf_from_fis);
4878EXPORT_SYMBOL_GPL(ata_check_status);
4879EXPORT_SYMBOL_GPL(ata_altstatus);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004880EXPORT_SYMBOL_GPL(ata_exec_command);
4881EXPORT_SYMBOL_GPL(ata_port_start);
4882EXPORT_SYMBOL_GPL(ata_port_stop);
Jeff Garzikaa8f0dc2005-05-26 21:54:27 -04004883EXPORT_SYMBOL_GPL(ata_host_stop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004884EXPORT_SYMBOL_GPL(ata_interrupt);
4885EXPORT_SYMBOL_GPL(ata_qc_prep);
4886EXPORT_SYMBOL_GPL(ata_bmdma_setup);
4887EXPORT_SYMBOL_GPL(ata_bmdma_start);
4888EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
4889EXPORT_SYMBOL_GPL(ata_bmdma_status);
4890EXPORT_SYMBOL_GPL(ata_bmdma_stop);
4891EXPORT_SYMBOL_GPL(ata_port_probe);
4892EXPORT_SYMBOL_GPL(sata_phy_reset);
4893EXPORT_SYMBOL_GPL(__sata_phy_reset);
4894EXPORT_SYMBOL_GPL(ata_bus_reset);
Tejun Heo8a19ac82006-02-02 18:20:00 +09004895EXPORT_SYMBOL_GPL(ata_std_probeinit);
Tejun Heoc2bd5802006-01-24 17:05:22 +09004896EXPORT_SYMBOL_GPL(ata_std_softreset);
4897EXPORT_SYMBOL_GPL(sata_std_hardreset);
4898EXPORT_SYMBOL_GPL(ata_std_postreset);
4899EXPORT_SYMBOL_GPL(ata_std_probe_reset);
Tejun Heoa62c0fc2006-01-24 17:05:22 +09004900EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004901EXPORT_SYMBOL_GPL(ata_port_disable);
Jeff Garzik67846b32005-10-05 02:58:32 -04004902EXPORT_SYMBOL_GPL(ata_ratelimit);
Tejun Heo6f8b9952006-01-24 17:05:21 +09004903EXPORT_SYMBOL_GPL(ata_busy_sleep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004904EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
4905EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
Tejun Heof29841e2006-02-10 15:10:48 +09004906EXPORT_SYMBOL_GPL(ata_scsi_timed_out);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004907EXPORT_SYMBOL_GPL(ata_scsi_error);
4908EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
4909EXPORT_SYMBOL_GPL(ata_scsi_release);
4910EXPORT_SYMBOL_GPL(ata_host_intr);
4911EXPORT_SYMBOL_GPL(ata_dev_classify);
4912EXPORT_SYMBOL_GPL(ata_dev_id_string);
Brad Campbell6f2f3812005-05-12 15:07:47 -04004913EXPORT_SYMBOL_GPL(ata_dev_config);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004914EXPORT_SYMBOL_GPL(ata_scsi_simulate);
Tejun Heoa72ec4c2006-01-23 13:09:37 +09004915EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
4916EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004917
Alan Cox1bc4ccf2006-01-09 17:18:14 +00004918EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
Alan Cox452503f2005-10-21 19:01:32 -04004919EXPORT_SYMBOL_GPL(ata_timing_compute);
4920EXPORT_SYMBOL_GPL(ata_timing_merge);
4921
Linus Torvalds1da177e2005-04-16 15:20:36 -07004922#ifdef CONFIG_PCI
4923EXPORT_SYMBOL_GPL(pci_test_config_bits);
Jeff Garzik374b1872005-08-30 05:42:52 -04004924EXPORT_SYMBOL_GPL(ata_pci_host_stop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004925EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
4926EXPORT_SYMBOL_GPL(ata_pci_init_one);
4927EXPORT_SYMBOL_GPL(ata_pci_remove_one);
Jens Axboe9b847542006-01-06 09:28:07 +01004928EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
4929EXPORT_SYMBOL_GPL(ata_pci_device_resume);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004930#endif /* CONFIG_PCI */
Jens Axboe9b847542006-01-06 09:28:07 +01004931
4932EXPORT_SYMBOL_GPL(ata_device_suspend);
4933EXPORT_SYMBOL_GPL(ata_device_resume);
4934EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
4935EXPORT_SYMBOL_GPL(ata_scsi_device_resume);