blob: db96138fefcdef55f923580a0404674f8178314b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * IDE I/O functions
3 *
4 * Basic PIO and command management functionality.
5 *
6 * This code was split off from ide.c. See ide.c for history and original
7 * copyrights.
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2, or (at your option) any
12 * later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * For the avoidance of doubt the "preferred form" of this code is one which
20 * is in an open non patent encumbered format. Where cryptographic key signing
21 * forms part of the process of creating an executable the information
22 * including keys needed to generate an equivalently functional executable
23 * are deemed to be part of the source code.
24 */
25
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/module.h>
28#include <linux/types.h>
29#include <linux/string.h>
30#include <linux/kernel.h>
31#include <linux/timer.h>
32#include <linux/mm.h>
33#include <linux/interrupt.h>
34#include <linux/major.h>
35#include <linux/errno.h>
36#include <linux/genhd.h>
37#include <linux/blkpg.h>
38#include <linux/slab.h>
39#include <linux/init.h>
40#include <linux/pci.h>
41#include <linux/delay.h>
42#include <linux/ide.h>
43#include <linux/completion.h>
44#include <linux/reboot.h>
45#include <linux/cdrom.h>
46#include <linux/seq_file.h>
47#include <linux/device.h>
48#include <linux/kmod.h>
49#include <linux/scatterlist.h>
Jiri Slaby1977f032007-10-18 23:40:25 -070050#include <linux/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52#include <asm/byteorder.h>
53#include <asm/irq.h>
54#include <asm/uaccess.h>
55#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Bartlomiej Zolnierkiewicz37245aa2009-03-27 12:46:43 +010057int ide_end_rq(ide_drive_t *drive, struct request *rq, int error,
Bartlomiej Zolnierkiewicz1caf2362009-03-27 12:46:42 +010058 unsigned int nr_bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 /*
61 * decide whether to reenable DMA -- 3 is a random magic for now,
62 * if we DMA timeout more than 3 times, just stay in PIO
63 */
Bartlomiej Zolnierkiewiczc3922042008-10-13 21:39:37 +020064 if ((drive->dev_flags & IDE_DFLAG_DMA_PIO_RETRY) &&
65 drive->retry_pio <= 3) {
66 drive->dev_flags &= ~IDE_DFLAG_DMA_PIO_RETRY;
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +010067 ide_dma_on(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 }
69
Bartlomiej Zolnierkiewicz1caf2362009-03-27 12:46:42 +010070 return blk_end_request(rq, error, nr_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071}
Bartlomiej Zolnierkiewicz1caf2362009-03-27 12:46:42 +010072EXPORT_SYMBOL_GPL(ide_end_rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +010074void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err)
Bartlomiej Zolnierkiewicze1202372009-03-27 12:46:29 +010075{
Sergei Shtylyov35218d12009-03-31 20:15:31 +020076 const struct ide_tp_ops *tp_ops = drive->hwif->tp_ops;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +010077 struct ide_taskfile *tf = &cmd->tf;
78 struct request *rq = cmd->rq;
Bartlomiej Zolnierkiewicze7fedc32009-03-27 12:46:41 +010079 u8 tf_cmd = tf->command;
Bartlomiej Zolnierkiewicze1202372009-03-27 12:46:29 +010080
81 tf->error = err;
82 tf->status = stat;
83
Sergei Shtylyov35218d12009-03-31 20:15:31 +020084 if (cmd->ftf_flags & IDE_FTFLAG_IN_DATA) {
85 u8 data[2];
86
87 tp_ops->input_data(drive, cmd, data, 2);
88
Sergei Shtylyov745483f2009-04-08 14:13:02 +020089 cmd->tf.data = data[0];
90 cmd->hob.data = data[1];
Sergei Shtylyov35218d12009-03-31 20:15:31 +020091 }
92
Sergei Shtylyov3153c262009-04-08 14:13:03 +020093 ide_tf_readback(drive, cmd);
Bartlomiej Zolnierkiewicze1202372009-03-27 12:46:29 +010094
Bartlomiej Zolnierkiewicze7fedc32009-03-27 12:46:41 +010095 if ((cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) &&
96 tf_cmd == ATA_CMD_IDLEIMMEDIATE) {
97 if (tf->lbal != 0xc4) {
98 printk(KERN_ERR "%s: head unload failed!\n",
99 drive->name);
Sergei Shtylyov745483f2009-04-08 14:13:02 +0200100 ide_tf_dump(drive->name, cmd);
Bartlomiej Zolnierkiewicze7fedc32009-03-27 12:46:41 +0100101 } else
102 drive->dev_flags |= IDE_DFLAG_PARKED;
103 }
104
Bartlomiej Zolnierkiewiczf505d492009-04-18 17:42:20 +0200105 if (rq && rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
106 struct ide_cmd *orig_cmd = rq->special;
Bartlomiej Zolnierkiewicza09485d2009-03-27 12:46:31 +0100107
Bartlomiej Zolnierkiewiczf505d492009-04-18 17:42:20 +0200108 if (cmd->tf_flags & IDE_TFLAG_DYN)
109 kfree(orig_cmd);
110 else
111 memcpy(orig_cmd, cmd, sizeof(*cmd));
112 }
Bartlomiej Zolnierkiewicze1202372009-03-27 12:46:29 +0100113}
114
Bartlomiej Zolnierkiewiczf974b192009-03-27 12:46:44 +0100115int ide_complete_rq(ide_drive_t *drive, int error, unsigned int nr_bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116{
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100117 ide_hwif_t *hwif = drive->hwif;
118 struct request *rq = hwif->rq;
Bartlomiej Zolnierkiewicza9587fd2009-03-27 12:46:44 +0100119 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Bartlomiej Zolnierkiewicz130e8862009-03-27 12:46:45 +0100121 /*
122 * if failfast is set on a request, override number of sectors
123 * and complete the whole request right now
124 */
125 if (blk_noretry_request(rq) && error <= 0)
Tejun Heo5b936292009-05-07 22:24:38 +0900126 nr_bytes = blk_rq_sectors(rq) << 9;
Bartlomiej Zolnierkiewicz130e8862009-03-27 12:46:45 +0100127
Bartlomiej Zolnierkiewiczba7d4792009-03-27 12:46:44 +0100128 rc = ide_end_rq(drive, rq, error, nr_bytes);
Bartlomiej Zolnierkiewicza9587fd2009-03-27 12:46:44 +0100129 if (rc == 0)
130 hwif->rq = NULL;
Bartlomiej Zolnierkiewicz1d0bf582008-12-29 20:27:30 +0100131
Bartlomiej Zolnierkiewicza9587fd2009-03-27 12:46:44 +0100132 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133}
Bartlomiej Zolnierkiewicza09485d2009-03-27 12:46:31 +0100134EXPORT_SYMBOL(ide_complete_rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Bartlomiej Zolnierkiewicz327fa1c2009-03-24 23:22:47 +0100136void ide_kill_rq(ide_drive_t *drive, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137{
Bartlomiej Zolnierkiewicz3ee38302009-03-27 12:46:36 +0100138 u8 drv_req = blk_special_request(rq) && rq->rq_disk;
139 u8 media = drive->media;
140
Bartlomiej Zolnierkiewiczc152cc12009-03-27 12:46:34 +0100141 drive->failed_pc = NULL;
142
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100143 if ((media == ide_floppy || media == ide_tape) && drv_req) {
144 rq->errors = 0;
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100145 } else {
146 if (media == ide_tape)
147 rq->errors = IDE_DRV_ERROR_GENERAL;
Bartlomiej Zolnierkiewicz89f78b322009-03-27 12:46:43 +0100148 else if (blk_fs_request(rq) == 0 && rq->errors == 0)
149 rq->errors = -EIO;
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100150 }
Bartlomiej Zolnierkiewicz5e955242009-06-23 11:27:27 +0000151
152 ide_complete_rq(drive, -EIO, blk_rq_bytes(rq));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153}
154
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100155static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100157 tf->nsect = drive->sect;
158 tf->lbal = drive->sect;
159 tf->lbam = drive->cyl;
160 tf->lbah = drive->cyl >> 8;
Bartlomiej Zolnierkiewicz7f612f22008-10-13 21:39:40 +0200161 tf->device = (drive->head - 1) | drive->select;
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200162 tf->command = ATA_CMD_INIT_DEV_PARAMS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163}
164
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100165static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100167 tf->nsect = drive->sect;
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200168 tf->command = ATA_CMD_RESTORE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169}
170
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100171static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100173 tf->nsect = drive->mult_req;
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200174 tf->command = ATA_CMD_SET_MULTI;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175}
176
Bartlomiej Zolnierkiewicz582078e2009-05-17 19:12:18 +0200177/**
178 * do_special - issue some special commands
179 * @drive: drive the command is for
180 *
181 * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS,
182 * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive.
183 */
184
185static ide_startstop_t do_special(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186{
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100187 struct ide_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Bartlomiej Zolnierkiewicz582078e2009-05-17 19:12:18 +0200189#ifdef DEBUG
Bartlomiej Zolnierkiewiczca1b96e2009-05-17 19:12:21 +0200190 printk(KERN_DEBUG "%s: %s: 0x%02x\n", drive->name, __func__,
191 drive->special_flags);
Bartlomiej Zolnierkiewicz582078e2009-05-17 19:12:18 +0200192#endif
193 if (drive->media != ide_disk) {
Bartlomiej Zolnierkiewiczca1b96e2009-05-17 19:12:21 +0200194 drive->special_flags = 0;
Bartlomiej Zolnierkiewicz582078e2009-05-17 19:12:18 +0200195 drive->mult_req = 0;
196 return ide_stopped;
197 }
198
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100199 memset(&cmd, 0, sizeof(cmd));
Bartlomiej Zolnierkiewicz0dfb9912009-03-27 12:46:39 +0100200 cmd.protocol = ATA_PROT_NODATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Bartlomiej Zolnierkiewiczca1b96e2009-05-17 19:12:21 +0200202 if (drive->special_flags & IDE_SFLAG_SET_GEOMETRY) {
203 drive->special_flags &= ~IDE_SFLAG_SET_GEOMETRY;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100204 ide_tf_set_specify_cmd(drive, &cmd.tf);
Bartlomiej Zolnierkiewiczca1b96e2009-05-17 19:12:21 +0200205 } else if (drive->special_flags & IDE_SFLAG_RECALIBRATE) {
206 drive->special_flags &= ~IDE_SFLAG_RECALIBRATE;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100207 ide_tf_set_restore_cmd(drive, &cmd.tf);
Bartlomiej Zolnierkiewiczca1b96e2009-05-17 19:12:21 +0200208 } else if (drive->special_flags & IDE_SFLAG_SET_MULTMODE) {
209 drive->special_flags &= ~IDE_SFLAG_SET_MULTMODE;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100210 ide_tf_set_setmult_cmd(drive, &cmd.tf);
Bartlomiej Zolnierkiewicz5f582c82009-05-17 19:12:18 +0200211 } else
212 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200214 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
215 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
216 cmd.tf_flags = IDE_TFLAG_CUSTOM_HANDLER;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100217
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100218 do_rw_taskfile(drive, &cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
220 return ide_started;
221}
222
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100223void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
225 ide_hwif_t *hwif = drive->hwif;
226 struct scatterlist *sg = hwif->sg_table;
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100227 struct request *rq = cmd->rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Tejun Heo5ad960f2009-04-19 08:46:03 +0900229 cmd->sg_nents = blk_rq_map_sg(drive->queue, rq, sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231EXPORT_SYMBOL_GPL(ide_map_sg);
232
Bartlomiej Zolnierkiewiczbf717c02009-03-27 12:46:47 +0100233void ide_init_sg_cmd(struct ide_cmd *cmd, unsigned int nr_bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234{
Bartlomiej Zolnierkiewiczbf717c02009-03-27 12:46:47 +0100235 cmd->nbytes = cmd->nleft = nr_bytes;
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100236 cmd->cursg_ofs = 0;
237 cmd->cursg = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239EXPORT_SYMBOL_GPL(ide_init_sg_cmd);
240
241/**
242 * execute_drive_command - issue special drive command
Adrian Bunk338cec32005-09-10 00:26:54 -0700243 * @drive: the drive to issue the command on
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 * @rq: the request structure holding the command
245 *
246 * execute_drive_cmd() issues a special drive command, usually
247 * initiated by ioctl() from the external hdparm program. The
248 * command can be a drive command, drive task or taskfile
249 * operation. Weirdly you can call it with NULL to wait for
250 * all commands to finish. Don't do this as that is due to change
251 */
252
253static ide_startstop_t execute_drive_cmd (ide_drive_t *drive,
254 struct request *rq)
255{
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100256 struct ide_cmd *cmd = rq->special;
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100257
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100258 if (cmd) {
Bartlomiej Zolnierkiewicz0dfb9912009-03-27 12:46:39 +0100259 if (cmd->protocol == ATA_PROT_PIO) {
Tejun Heo9780e2d2009-05-07 22:24:40 +0900260 ide_init_sg_cmd(cmd, blk_rq_sectors(rq) << 9);
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100261 ide_map_sg(drive, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 }
263
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100264 return do_rw_taskfile(drive, cmd);
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100265 }
266
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 /*
268 * NULL is actually a valid way of waiting for
269 * all current requests to be flushed from the queue.
270 */
271#ifdef DEBUG
272 printk("%s: DRIVE_CMD (null)\n", drive->name);
273#endif
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100274 rq->errors = 0;
Bartlomiej Zolnierkiewiczf974b192009-03-27 12:46:44 +0100275 ide_complete_rq(drive, 0, blk_rq_bytes(rq));
Bartlomiej Zolnierkiewicz64a57fe2008-02-06 02:57:51 +0100276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return ide_stopped;
278}
279
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200280static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq)
281{
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200282 u8 cmd = rq->cmd[0];
283
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200284 switch (cmd) {
Bartlomiej Zolnierkiewicz1bc6daa2009-03-24 23:22:44 +0100285 case REQ_PARK_HEADS:
286 case REQ_UNPARK_HEADS:
287 return ide_do_park_unpark(drive, rq);
Elias Oltmanns92f1f8f2008-10-10 22:39:40 +0200288 case REQ_DEVSET_EXEC:
Bartlomiej Zolnierkiewicz1bc6daa2009-03-24 23:22:44 +0100289 return ide_do_devset(drive, rq);
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200290 case REQ_DRIVE_RESET:
291 return ide_do_reset(drive);
292 default:
Bartlomiej Zolnierkiewicz17137882009-03-27 12:46:42 +0100293 BUG();
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200294 }
295}
296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297/**
298 * start_request - start of I/O and command issuing for IDE
299 *
300 * start_request() initiates handling of a new I/O request. It
Bartlomiej Zolnierkiewicz3c619ff2008-10-10 22:39:22 +0200301 * accepts commands and I/O (read/write) requests.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 *
303 * FIXME: this function needs a rename
304 */
305
306static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
307{
308 ide_startstop_t startstop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Jens Axboe4aff5e22006-08-10 08:44:47 +0200310 BUG_ON(!blk_rq_started(rq));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
312#ifdef DEBUG
313 printk("%s: start_request: current=0x%08lx\n",
Bartlomiej Zolnierkiewicz898ec222009-01-06 17:20:52 +0100314 drive->hwif->name, (unsigned long) rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315#endif
316
317 /* bail early if we've exceeded max_failures */
318 if (drive->max_failures && (drive->failures > drive->max_failures)) {
Aristeu Rozanskib5e1a4e2008-01-25 22:17:04 +0100319 rq->cmd_flags |= REQ_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 goto kill_rq;
321 }
322
Jens Axboead3cadd2006-06-13 08:46:57 +0200323 if (blk_pm_request(rq))
324 ide_check_pm_state(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
Sergei Shtylyovfdd88f02009-03-31 20:15:33 +0200326 drive->hwif->tp_ops->dev_select(drive);
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200327 if (ide_wait_stat(&startstop, drive, drive->ready_stat,
328 ATA_BUSY | ATA_DRQ, WAIT_READY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 printk(KERN_ERR "%s: drive not ready for command\n", drive->name);
330 return startstop;
331 }
Bartlomiej Zolnierkiewiczca1b96e2009-05-17 19:12:21 +0200332
333 if (drive->special_flags == 0) {
Bartlomiej Zolnierkiewicz7f3c8682009-01-06 17:20:53 +0100334 struct ide_driver *drv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200336 /*
337 * We reset the drive so we need to issue a SETFEATURES.
338 * Do it _after_ do_special() restored device parameters.
339 */
340 if (drive->current_speed == 0xff)
341 ide_config_drive_speed(drive, drive->desired_speed);
342
Bartlomiej Zolnierkiewicz7267c332008-01-26 20:13:13 +0100343 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 return execute_drive_cmd(drive, rq);
345 else if (blk_pm_request(rq)) {
Tejun Heo765139e2009-04-19 07:00:43 +0900346 struct request_pm_state *pm = rq->special;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347#ifdef DEBUG_PM
348 printk("%s: start_power_step(step: %d)\n",
Bartlomiej Zolnierkiewicz6b7d8fc2008-12-02 20:40:03 +0100349 drive->name, pm->pm_step);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350#endif
351 startstop = ide_start_power_step(drive, rq);
352 if (startstop == ide_stopped &&
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200353 pm->pm_step == IDE_PM_COMPLETED)
Bartlomiej Zolnierkiewicz3616b652009-03-27 12:46:29 +0100354 ide_complete_pm_rq(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 return startstop;
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200356 } else if (!rq->rq_disk && blk_special_request(rq))
357 /*
358 * TODO: Once all ULDs have been modified to
359 * check for specific op codes rather than
360 * blindly accepting any special request, the
361 * check for ->rq_disk above may be replaced
362 * by a more suitable mechanism or even
363 * dropped entirely.
364 */
365 return ide_special_rq(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
Bartlomiej Zolnierkiewicz7f3c8682009-01-06 17:20:53 +0100367 drv = *(struct ide_driver **)rq->rq_disk->private_data;
Bartlomiej Zolnierkiewicz3c619ff2008-10-10 22:39:22 +0200368
Tejun Heo9780e2d2009-05-07 22:24:40 +0900369 return drv->do_request(drive, rq, blk_rq_pos(rq));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 }
371 return do_special(drive);
372kill_rq:
373 ide_kill_rq(drive, rq);
374 return ide_stopped;
375}
376
377/**
378 * ide_stall_queue - pause an IDE device
379 * @drive: drive to stall
380 * @timeout: time to stall for (jiffies)
381 *
382 * ide_stall_queue() can be used by a drive to give excess bandwidth back
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100383 * to the port by sleeping for timeout jiffies.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 */
385
386void ide_stall_queue (ide_drive_t *drive, unsigned long timeout)
387{
388 if (timeout > WAIT_WORSTCASE)
389 timeout = WAIT_WORSTCASE;
390 drive->sleep = timeout + jiffies;
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200391 drive->dev_flags |= IDE_DFLAG_SLEEPING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393EXPORT_SYMBOL(ide_stall_queue);
394
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100395static inline int ide_lock_port(ide_hwif_t *hwif)
396{
397 if (hwif->busy)
398 return 1;
399
400 hwif->busy = 1;
401
402 return 0;
403}
404
405static inline void ide_unlock_port(ide_hwif_t *hwif)
406{
407 hwif->busy = 0;
408}
409
410static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif)
411{
412 int rc = 0;
413
414 if (host->host_flags & IDE_HFLAG_SERIALIZE) {
415 rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy);
416 if (rc == 0) {
Bartlomiej Zolnierkiewicze354c1d2009-03-27 12:46:22 +0100417 if (host->get_lock)
418 host->get_lock(ide_intr, hwif);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100419 }
420 }
421 return rc;
422}
423
424static inline void ide_unlock_host(struct ide_host *host)
425{
426 if (host->host_flags & IDE_HFLAG_SERIALIZE) {
Bartlomiej Zolnierkiewicze354c1d2009-03-27 12:46:22 +0100427 if (host->release_lock)
428 host->release_lock();
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100429 clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy);
430 }
431}
432
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433/*
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100434 * Issue a new request to a device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 */
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100436void do_ide_request(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437{
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100438 ide_drive_t *drive = q->queuedata;
439 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100440 struct ide_host *host = hwif->host;
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100441 struct request *rq = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 ide_startstop_t startstop;
443
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100444 /*
445 * drive is doing pre-flush, ordered write, post-flush sequence. even
446 * though that is 3 requests, it must be seen as a single transaction.
447 * we must not preempt this drive until that is complete
448 */
449 if (blk_queue_flushing(q))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 /*
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100451 * small race where queue could get replugged during
452 * the 3-request flush cycle, just yank the plug since
453 * we want it to finish asap
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 */
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100455 blk_remove_plug(q);
456
457 spin_unlock_irq(q->queue_lock);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100458
Tejun Heo02e7cf82009-04-19 07:00:42 +0900459 /* HLD do_request() callback might sleep, make sure it's okay */
460 might_sleep();
461
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100462 if (ide_lock_host(host, hwif))
463 goto plug_device_2;
464
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100465 spin_lock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100466
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100467 if (!ide_lock_port(hwif)) {
Bartlomiej Zolnierkiewicz42cf2612009-01-06 17:20:47 +0100468 ide_hwif_t *prev_port;
David S. Miller3503e0a2009-07-06 12:39:27 -0700469
470 WARN_ON_ONCE(hwif->rq);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100471repeat:
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100472 prev_port = hwif->host->cur_port;
Elias Oltmanns90109412009-03-31 20:14:56 +0200473 if (drive->dev_flags & IDE_DFLAG_SLEEPING &&
474 time_after(drive->sleep, jiffies)) {
475 ide_unlock_port(hwif);
476 goto plug_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 }
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100478
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100479 if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) &&
480 hwif != prev_port) {
Bartlomiej Zolnierkiewicz734affd2009-06-07 15:37:10 +0200481 ide_drive_t *cur_dev =
482 prev_port ? prev_port->cur_dev : NULL;
483
Bartlomiej Zolnierkiewicz7299a392008-01-25 22:17:14 +0100484 /*
Bartlomiej Zolnierkiewicz42cf2612009-01-06 17:20:47 +0100485 * set nIEN for previous port, drives in the
Bartlomiej Zolnierkiewicz734affd2009-06-07 15:37:10 +0200486 * quirk list may not like intr setups/cleanups
Bartlomiej Zolnierkiewicz7299a392008-01-25 22:17:14 +0100487 */
Bartlomiej Zolnierkiewicz734affd2009-06-07 15:37:10 +0200488 if (cur_dev &&
489 (cur_dev->dev_flags & IDE_DFLAG_NIEN_QUIRK) == 0)
Sergei Shtylyovecf3a312009-03-31 20:15:30 +0200490 prev_port->tp_ops->write_devctl(prev_port,
491 ATA_NIEN |
492 ATA_DEVCTL_OBS);
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100493
494 hwif->host->cur_port = hwif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 }
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100496 hwif->cur_dev = drive;
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200497 drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
David S. Miller3503e0a2009-07-06 12:39:27 -0700499 spin_unlock_irq(&hwif->lock);
500 spin_lock_irq(q->queue_lock);
501 /*
502 * we know that the queue isn't empty, but this can happen
503 * if the q->prep_rq_fn() decides to kill a request
504 */
505 if (!rq)
Tejun Heo9934c8c2009-05-08 11:54:16 +0900506 rq = blk_fetch_request(drive->queue);
Tejun Heo8f6205c2009-05-08 11:53:59 +0900507
David S. Miller3503e0a2009-07-06 12:39:27 -0700508 spin_unlock_irq(q->queue_lock);
509 spin_lock_irq(&hwif->lock);
510
511 if (!rq) {
512 ide_unlock_port(hwif);
513 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 }
515
516 /*
517 * Sanity: don't accept a request that isn't a PM request
David S. Miller3503e0a2009-07-06 12:39:27 -0700518 * if we are currently power managed. This is very important as
519 * blk_stop_queue() doesn't prevent the blk_fetch_request()
520 * above to return us whatever is in the queue. Since we call
521 * ide_do_request() ourselves, we end up taking requests while
522 * the queue is blocked...
523 *
524 * We let requests forced at head of queue with ide-preempt
525 * though. I hope that doesn't happen too much, hopefully not
526 * unless the subdriver triggers such a thing in its own PM
527 * state machine.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 */
David S. Miller3503e0a2009-07-06 12:39:27 -0700529 if ((drive->dev_flags & IDE_DFLAG_BLOCKED) &&
530 blk_pm_request(rq) == 0 &&
531 (rq->cmd_flags & REQ_PREEMPT) == 0) {
532 /* there should be no pending command at this point */
533 ide_unlock_port(hwif);
534 goto plug_device;
535 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100537 hwif->rq = rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100539 spin_unlock_irq(&hwif->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 startstop = start_request(drive, rq);
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100541 spin_lock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100542
Tejun Heo8f6205c2009-05-08 11:53:59 +0900543 if (startstop == ide_stopped) {
544 rq = hwif->rq;
545 hwif->rq = NULL;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100546 goto repeat;
Tejun Heo8f6205c2009-05-08 11:53:59 +0900547 }
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100548 } else
549 goto plug_device;
550out:
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100551 spin_unlock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100552 if (rq == NULL)
553 ide_unlock_host(host);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100554 spin_lock_irq(q->queue_lock);
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100555 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100557plug_device:
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100558 spin_unlock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100559 ide_unlock_host(host);
560plug_device_2:
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100561 spin_lock_irq(q->queue_lock);
562
Tejun Heo8f6205c2009-05-08 11:53:59 +0900563 if (rq)
564 blk_requeue_request(q, rq);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100565 if (!elv_queue_empty(q))
566 blk_plug_device(q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567}
568
Tejun Heo8f6205c2009-05-08 11:53:59 +0900569static void ide_requeue_and_plug(ide_drive_t *drive, struct request *rq)
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100570{
571 struct request_queue *q = drive->queue;
572 unsigned long flags;
573
574 spin_lock_irqsave(q->queue_lock, flags);
Tejun Heo8f6205c2009-05-08 11:53:59 +0900575
576 if (rq)
577 blk_requeue_request(q, rq);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100578 if (!elv_queue_empty(q))
579 blk_plug_device(q);
Tejun Heo8f6205c2009-05-08 11:53:59 +0900580
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100581 spin_unlock_irqrestore(q->queue_lock, flags);
582}
583
Bartlomiej Zolnierkiewiczb6a45a02009-03-24 23:22:43 +0100584static int drive_is_ready(ide_drive_t *drive)
585{
586 ide_hwif_t *hwif = drive->hwif;
587 u8 stat = 0;
588
589 if (drive->waiting_for_dma)
590 return hwif->dma_ops->dma_test_irq(drive);
591
592 if (hwif->io_ports.ctl_addr &&
593 (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0)
594 stat = hwif->tp_ops->read_altstatus(hwif);
595 else
596 /* Note: this may clear a pending IRQ!! */
597 stat = hwif->tp_ops->read_status(hwif);
598
599 if (stat & ATA_BUSY)
600 /* drive busy: definitely not interrupting */
601 return 0;
602
603 /* drive ready: *might* be interrupting */
604 return 1;
605}
606
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607/**
608 * ide_timer_expiry - handle lack of an IDE interrupt
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100609 * @data: timer callback magic (hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 *
611 * An IDE command has timed out before the expected drive return
612 * occurred. At this point we attempt to clean up the current
613 * mess. If the current handler includes an expiry handler then
614 * we invoke the expiry handler, and providing it is happy the
615 * work is done. If that fails we apply generic recovery rules
616 * invoking the handler and checking the drive DMA status. We
617 * have an excessively incestuous relationship with the DMA
618 * logic that wants cleaning up.
619 */
620
621void ide_timer_expiry (unsigned long data)
622{
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100623 ide_hwif_t *hwif = (ide_hwif_t *)data;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100624 ide_drive_t *uninitialized_var(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 ide_handler_t *handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 unsigned long flags;
Roel Kluine0c6dcd2009-03-05 16:10:55 +0100627 int wait = -1;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100628 int plug_device = 0;
Tejun Heo8f6205c2009-05-08 11:53:59 +0900629 struct request *uninitialized_var(rq_in_flight);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100631 spin_lock_irqsave(&hwif->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100633 handler = hwif->handler;
634
635 if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 /*
637 * Either a marginal timeout occurred
638 * (got the interrupt just as timer expired),
639 * or we were "sleeping" to give other devices a chance.
640 * Either way, we don't really want to complain about anything.
641 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 } else {
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100643 ide_expiry_t *expiry = hwif->expiry;
644 ide_startstop_t startstop = ide_stopped;
Bartlomiej Zolnierkiewiczb2cfb052009-01-02 16:12:49 +0100645
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100646 drive = hwif->cur_dev;
647
648 if (expiry) {
649 wait = expiry(drive);
650 if (wait > 0) { /* continue */
651 /* reset timer */
652 hwif->timer.expires = jiffies + wait;
653 hwif->req_gen_timer = hwif->req_gen;
654 add_timer(&hwif->timer);
655 spin_unlock_irqrestore(&hwif->lock, flags);
656 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 }
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100658 }
659 hwif->handler = NULL;
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100660 hwif->expiry = NULL;
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100661 /*
662 * We need to simulate a real interrupt when invoking
663 * the handler() function, which means we need to
664 * globally mask the specific IRQ:
665 */
666 spin_unlock(&hwif->lock);
667 /* disable_irq_nosync ?? */
668 disable_irq(hwif->irq);
669 /* local CPU only, as if we were handling an interrupt */
670 local_irq_disable();
671 if (hwif->polling) {
672 startstop = handler(drive);
673 } else if (drive_is_ready(drive)) {
674 if (drive->waiting_for_dma)
675 hwif->dma_ops->dma_lost_irq(drive);
Sergei Shtylyov53b987d2009-06-15 18:52:55 +0200676 if (hwif->port_ops && hwif->port_ops->clear_irq)
677 hwif->port_ops->clear_irq(drive);
678
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100679 printk(KERN_WARNING "%s: lost interrupt\n",
680 drive->name);
681 startstop = handler(drive);
682 } else {
683 if (drive->waiting_for_dma)
684 startstop = ide_dma_timeout_retry(drive, wait);
685 else
686 startstop = ide_error(drive, "irq timeout",
687 hwif->tp_ops->read_status(hwif));
688 }
689 spin_lock_irq(&hwif->lock);
690 enable_irq(hwif->irq);
Bartlomiej Zolnierkiewicze3b29f02009-05-22 16:23:37 +0200691 if (startstop == ide_stopped && hwif->polling == 0) {
Tejun Heo8f6205c2009-05-08 11:53:59 +0900692 rq_in_flight = hwif->rq;
693 hwif->rq = NULL;
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100694 ide_unlock_port(hwif);
695 plug_device = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 }
697 }
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100698 spin_unlock_irqrestore(&hwif->lock, flags);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100699
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100700 if (plug_device) {
701 ide_unlock_host(hwif->host);
Tejun Heo8f6205c2009-05-08 11:53:59 +0900702 ide_requeue_and_plug(drive, rq_in_flight);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100703 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704}
705
706/**
707 * unexpected_intr - handle an unexpected IDE interrupt
708 * @irq: interrupt line
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100709 * @hwif: port being processed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 *
711 * There's nothing really useful we can do with an unexpected interrupt,
712 * other than reading the status register (to clear it), and logging it.
713 * There should be no way that an irq can happen before we're ready for it,
714 * so we needn't worry much about losing an "important" interrupt here.
715 *
716 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
717 * the drive enters "idle", "standby", or "sleep" mode, so if the status
718 * looks "good", we just ignore the interrupt completely.
719 *
720 * This routine assumes __cli() is in effect when called.
721 *
722 * If an unexpected interrupt happens on irq15 while we are handling irq14
723 * and if the two interfaces are "serialized" (CMD640), then it looks like
724 * we could screw up by interfering with a new request being set up for
725 * irq15.
726 *
727 * In reality, this is a non-issue. The new command is not sent unless
728 * the drive is ready to accept one, in which case we know the drive is
729 * not trying to interrupt us. And ide_set_handler() is always invoked
730 * before completing the issuance of any new drive command, so we will not
731 * be accidentally invoked as a result of any valid command completion
732 * interrupt.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 */
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100734
735static void unexpected_intr(int irq, ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736{
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100737 u8 stat = hwif->tp_ops->read_status(hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100739 if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) {
740 /* Try to not flood the console with msgs */
741 static unsigned long last_msgtime, count;
742 ++count;
Bartlomiej Zolnierkiewiczb73c7ee2008-07-23 19:55:52 +0200743
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100744 if (time_after(jiffies, last_msgtime + HZ)) {
745 last_msgtime = jiffies;
746 printk(KERN_ERR "%s: unexpected interrupt, "
747 "status=0x%02x, count=%ld\n",
748 hwif->name, stat, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 }
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100750 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751}
752
753/**
754 * ide_intr - default IDE interrupt handler
755 * @irq: interrupt number
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100756 * @dev_id: hwif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 * @regs: unused weirdness from the kernel irq layer
758 *
759 * This is the default IRQ handler for the IDE layer. You should
760 * not need to override it. If you do be aware it is subtle in
761 * places
762 *
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100763 * hwif is the interface in the group currently performing
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100764 * a command. hwif->cur_dev is the drive and hwif->handler is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 * the IRQ handler to call. As we issue a command the handlers
766 * step through multiple states, reassigning the handler to the
767 * next step in the process. Unlike a smart SCSI controller IDE
768 * expects the main processor to sequence the various transfer
769 * stages. We also manage a poll timer to catch up with most
770 * timeout situations. There are still a few where the handlers
771 * don't ever decide to give up.
772 *
773 * The handler eventually returns ide_stopped to indicate the
774 * request completed. At this point we issue the next request
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100775 * on the port and the process begins again.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 */
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100777
David Howells7d12e782006-10-05 14:55:46 +0100778irqreturn_t ide_intr (int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779{
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100780 ide_hwif_t *hwif = (ide_hwif_t *)dev_id;
Bartlomiej Zolnierkiewicz255115fb2009-03-27 12:46:27 +0100781 struct ide_host *host = hwif->host;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100782 ide_drive_t *uninitialized_var(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 ide_handler_t *handler;
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100784 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 ide_startstop_t startstop;
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100786 irqreturn_t irq_ret = IRQ_NONE;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100787 int plug_device = 0;
Tejun Heo8f6205c2009-05-08 11:53:59 +0900788 struct request *uninitialized_var(rq_in_flight);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
Bartlomiej Zolnierkiewicz255115fb2009-03-27 12:46:27 +0100790 if (host->host_flags & IDE_HFLAG_SERIALIZE) {
791 if (hwif != host->cur_port)
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100792 goto out_early;
793 }
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100794
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100795 spin_lock_irqsave(&hwif->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
Sergei Shtylyovf4d3ffa2009-06-15 18:52:58 +0200797 if (hwif->port_ops && hwif->port_ops->test_irq &&
798 hwif->port_ops->test_irq(hwif) == 0)
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100799 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100801 handler = hwif->handler;
802
803 if (handler == NULL || hwif->polling) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 /*
805 * Not expecting an interrupt from this drive.
806 * That means this could be:
807 * (1) an interrupt from another PCI device
808 * sharing the same PCI INT# as us.
809 * or (2) a drive just entered sleep or standby mode,
810 * and is interrupting to let us know.
811 * or (3) a spurious interrupt of unknown origin.
812 *
813 * For PCI, we cannot tell the difference,
814 * so in that case we just ignore it and hope it goes away.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 */
Bartlomiej Zolnierkiewicz255115fb2009-03-27 12:46:27 +0100816 if ((host->irq_flags & IRQF_SHARED) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 /*
818 * Probably not a shared PCI interrupt,
819 * so we can safely try to do something about it:
820 */
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100821 unexpected_intr(irq, hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 } else {
823 /*
824 * Whack the status register, just in case
825 * we have a leftover pending IRQ.
826 */
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200827 (void)hwif->tp_ops->read_status(hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 }
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100829 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 }
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100831
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100832 drive = hwif->cur_dev;
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100833
834 if (!drive_is_ready(drive))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 /*
836 * This happens regularly when we share a PCI IRQ with
837 * another device. Unfortunately, it can also happen
838 * with some buggy drives that trigger the IRQ before
839 * their status register is up to date. Hopefully we have
840 * enough advance overhead that the latter isn't a problem.
841 */
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100842 goto out;
843
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100844 hwif->handler = NULL;
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100845 hwif->expiry = NULL;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100846 hwif->req_gen++;
847 del_timer(&hwif->timer);
848 spin_unlock(&hwif->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
Bartlomiej Zolnierkiewiczbfa7d8e2008-10-13 21:39:42 +0200850 if (hwif->port_ops && hwif->port_ops->clear_irq)
851 hwif->port_ops->clear_irq(drive);
Albert Leef0dd8712007-02-17 02:40:21 +0100852
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200853 if (drive->dev_flags & IDE_DFLAG_UNMASK)
Ingo Molnar366c7f52006-07-03 00:25:25 -0700854 local_irq_enable_in_hardirq();
Bartlomiej Zolnierkiewiczbfa7d8e2008-10-13 21:39:42 +0200855
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 /* service this interrupt, may set handler for next interrupt */
857 startstop = handler(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100859 spin_lock_irq(&hwif->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 /*
861 * Note that handler() may have set things up for another
862 * interrupt to occur soon, but it cannot happen until
863 * we exit from this routine, because it will be the
864 * same irq as is currently being serviced here, and Linux
865 * won't allow another of the same (on any CPU) until we return.
866 */
Bartlomiej Zolnierkiewicze3b29f02009-05-22 16:23:37 +0200867 if (startstop == ide_stopped && hwif->polling == 0) {
Bartlomiej Zolnierkiewicz9600dcf2009-01-06 17:20:58 +0100868 BUG_ON(hwif->handler);
Tejun Heo8f6205c2009-05-08 11:53:59 +0900869 rq_in_flight = hwif->rq;
870 hwif->rq = NULL;
Bartlomiej Zolnierkiewicz9600dcf2009-01-06 17:20:58 +0100871 ide_unlock_port(hwif);
872 plug_device = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 }
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100874 irq_ret = IRQ_HANDLED;
875out:
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100876 spin_unlock_irqrestore(&hwif->lock, flags);
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100877out_early:
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100878 if (plug_device) {
879 ide_unlock_host(hwif->host);
Tejun Heo8f6205c2009-05-08 11:53:59 +0900880 ide_requeue_and_plug(drive, rq_in_flight);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100881 }
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100882
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100883 return irq_ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884}
Stanislaw Gruszka849d7132009-03-05 16:10:57 +0100885EXPORT_SYMBOL_GPL(ide_intr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +0200887void ide_pad_transfer(ide_drive_t *drive, int write, int len)
888{
889 ide_hwif_t *hwif = drive->hwif;
890 u8 buf[4] = { 0 };
891
892 while (len > 0) {
893 if (write)
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200894 hwif->tp_ops->output_data(drive, NULL, buf, min(4, len));
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +0200895 else
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200896 hwif->tp_ops->input_data(drive, NULL, buf, min(4, len));
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +0200897 len -= 4;
898 }
899}
900EXPORT_SYMBOL_GPL(ide_pad_transfer);