blob: 99bb0a9a67e879205d9e5702bf6fef7545a59700 [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
89 tf->data = data[0];
90 tf->hob_data = data[1];
91 }
92
93 tp_ops->tf_read(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);
100 ide_tf_dump(drive->name, tf);
101 } else
102 drive->dev_flags |= IDE_DFLAG_PARKED;
103 }
104
Bartlomiej Zolnierkiewicza09485d2009-03-27 12:46:31 +0100105 if (rq && rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100106 memcpy(rq->special, cmd, sizeof(*cmd));
Bartlomiej Zolnierkiewicza09485d2009-03-27 12:46:31 +0100107
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100108 if (cmd->tf_flags & IDE_TFLAG_DYN)
109 kfree(cmd);
Bartlomiej Zolnierkiewicze1202372009-03-27 12:46:29 +0100110}
111
Bartlomiej Zolnierkiewicz130e8862009-03-27 12:46:45 +0100112/* obsolete, blk_rq_bytes() should be used instead */
113unsigned int ide_rq_bytes(struct request *rq)
114{
115 if (blk_pc_request(rq))
116 return rq->data_len;
117 else
118 return rq->hard_cur_sectors << 9;
119}
120EXPORT_SYMBOL_GPL(ide_rq_bytes);
121
Bartlomiej Zolnierkiewiczf974b192009-03-27 12:46:44 +0100122int ide_complete_rq(ide_drive_t *drive, int error, unsigned int nr_bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123{
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100124 ide_hwif_t *hwif = drive->hwif;
125 struct request *rq = hwif->rq;
Bartlomiej Zolnierkiewicza9587fd2009-03-27 12:46:44 +0100126 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Bartlomiej Zolnierkiewicz130e8862009-03-27 12:46:45 +0100128 /*
129 * if failfast is set on a request, override number of sectors
130 * and complete the whole request right now
131 */
132 if (blk_noretry_request(rq) && error <= 0)
133 nr_bytes = rq->hard_nr_sectors << 9;
134
Bartlomiej Zolnierkiewiczba7d4792009-03-27 12:46:44 +0100135 rc = ide_end_rq(drive, rq, error, nr_bytes);
Bartlomiej Zolnierkiewicza9587fd2009-03-27 12:46:44 +0100136 if (rc == 0)
137 hwif->rq = NULL;
Bartlomiej Zolnierkiewicz1d0bf582008-12-29 20:27:30 +0100138
Bartlomiej Zolnierkiewicza9587fd2009-03-27 12:46:44 +0100139 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
Bartlomiej Zolnierkiewicza09485d2009-03-27 12:46:31 +0100141EXPORT_SYMBOL(ide_complete_rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Bartlomiej Zolnierkiewicz327fa1c2009-03-24 23:22:47 +0100143void ide_kill_rq(ide_drive_t *drive, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
Bartlomiej Zolnierkiewicz3ee38302009-03-27 12:46:36 +0100145 u8 drv_req = blk_special_request(rq) && rq->rq_disk;
146 u8 media = drive->media;
147
Bartlomiej Zolnierkiewiczc152cc12009-03-27 12:46:34 +0100148 drive->failed_pc = NULL;
149
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100150 if ((media == ide_floppy || media == ide_tape) && drv_req) {
151 rq->errors = 0;
Bartlomiej Zolnierkiewiczf974b192009-03-27 12:46:44 +0100152 ide_complete_rq(drive, 0, blk_rq_bytes(rq));
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100153 } else {
154 if (media == ide_tape)
155 rq->errors = IDE_DRV_ERROR_GENERAL;
Bartlomiej Zolnierkiewicz89f78b322009-03-27 12:46:43 +0100156 else if (blk_fs_request(rq) == 0 && rq->errors == 0)
157 rq->errors = -EIO;
Bartlomiej Zolnierkiewicz130e8862009-03-27 12:46:45 +0100158 ide_complete_rq(drive, -EIO, ide_rq_bytes(rq));
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100159 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160}
161
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100162static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100164 tf->nsect = drive->sect;
165 tf->lbal = drive->sect;
166 tf->lbam = drive->cyl;
167 tf->lbah = drive->cyl >> 8;
Bartlomiej Zolnierkiewicz7f612f22008-10-13 21:39:40 +0200168 tf->device = (drive->head - 1) | drive->select;
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200169 tf->command = ATA_CMD_INIT_DEV_PARAMS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100172static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100174 tf->nsect = drive->sect;
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200175 tf->command = ATA_CMD_RESTORE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176}
177
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100178static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100180 tf->nsect = drive->mult_req;
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200181 tf->command = ATA_CMD_SET_MULTI;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182}
183
184static ide_startstop_t ide_disk_special(ide_drive_t *drive)
185{
186 special_t *s = &drive->special;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100187 struct ide_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100189 memset(&cmd, 0, sizeof(cmd));
Bartlomiej Zolnierkiewicz0dfb9912009-03-27 12:46:39 +0100190 cmd.protocol = ATA_PROT_NODATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
192 if (s->b.set_geometry) {
193 s->b.set_geometry = 0;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100194 ide_tf_set_specify_cmd(drive, &cmd.tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 } else if (s->b.recalibrate) {
196 s->b.recalibrate = 0;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100197 ide_tf_set_restore_cmd(drive, &cmd.tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 } else if (s->b.set_multmode) {
199 s->b.set_multmode = 0;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100200 ide_tf_set_setmult_cmd(drive, &cmd.tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 } else if (s->all) {
202 int special = s->all;
203 s->all = 0;
204 printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special);
205 return ide_stopped;
206 }
207
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200208 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
209 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
210 cmd.tf_flags = IDE_TFLAG_CUSTOM_HANDLER;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100211
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100212 do_rw_taskfile(drive, &cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
214 return ide_started;
215}
216
217/**
218 * do_special - issue some special commands
219 * @drive: drive the command is for
220 *
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200221 * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS,
222 * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive.
223 *
224 * It used to do much more, but has been scaled back.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 */
226
227static ide_startstop_t do_special (ide_drive_t *drive)
228{
229 special_t *s = &drive->special;
230
231#ifdef DEBUG
232 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
233#endif
Bartlomiej Zolnierkiewicz6982daf2008-10-13 21:39:40 +0200234 if (drive->media == ide_disk)
235 return ide_disk_special(drive);
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200236
Bartlomiej Zolnierkiewicz6982daf2008-10-13 21:39:40 +0200237 s->all = 0;
238 drive->mult_req = 0;
239 return ide_stopped;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240}
241
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100242void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
244 ide_hwif_t *hwif = drive->hwif;
245 struct scatterlist *sg = hwif->sg_table;
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100246 struct request *rq = cmd->rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Borislav Petkov9e772d02009-02-02 20:12:21 +0100248 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE);
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100250 cmd->sg_nents = 1;
Borislav Petkov9e772d02009-02-02 20:12:21 +0100251 } else if (!rq->bio) {
252 sg_init_one(sg, rq->data, rq->data_len);
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100253 cmd->sg_nents = 1;
254 } else
255 cmd->sg_nents = blk_rq_map_sg(drive->queue, rq, sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257EXPORT_SYMBOL_GPL(ide_map_sg);
258
Bartlomiej Zolnierkiewiczbf717c02009-03-27 12:46:47 +0100259void ide_init_sg_cmd(struct ide_cmd *cmd, unsigned int nr_bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260{
Bartlomiej Zolnierkiewiczbf717c02009-03-27 12:46:47 +0100261 cmd->nbytes = cmd->nleft = nr_bytes;
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100262 cmd->cursg_ofs = 0;
263 cmd->cursg = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265EXPORT_SYMBOL_GPL(ide_init_sg_cmd);
266
267/**
268 * execute_drive_command - issue special drive command
Adrian Bunk338cec32005-09-10 00:26:54 -0700269 * @drive: the drive to issue the command on
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 * @rq: the request structure holding the command
271 *
272 * execute_drive_cmd() issues a special drive command, usually
273 * initiated by ioctl() from the external hdparm program. The
274 * command can be a drive command, drive task or taskfile
275 * operation. Weirdly you can call it with NULL to wait for
276 * all commands to finish. Don't do this as that is due to change
277 */
278
279static ide_startstop_t execute_drive_cmd (ide_drive_t *drive,
280 struct request *rq)
281{
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100282 struct ide_cmd *cmd = rq->special;
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100283
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100284 if (cmd) {
Bartlomiej Zolnierkiewicz0dfb9912009-03-27 12:46:39 +0100285 if (cmd->protocol == ATA_PROT_PIO) {
Bartlomiej Zolnierkiewiczbf717c02009-03-27 12:46:47 +0100286 ide_init_sg_cmd(cmd, rq->nr_sectors << 9);
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100287 ide_map_sg(drive, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 }
289
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100290 return do_rw_taskfile(drive, cmd);
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100291 }
292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 /*
294 * NULL is actually a valid way of waiting for
295 * all current requests to be flushed from the queue.
296 */
297#ifdef DEBUG
298 printk("%s: DRIVE_CMD (null)\n", drive->name);
299#endif
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100300 rq->errors = 0;
Bartlomiej Zolnierkiewiczf974b192009-03-27 12:46:44 +0100301 ide_complete_rq(drive, 0, blk_rq_bytes(rq));
Bartlomiej Zolnierkiewicz64a57fe2008-02-06 02:57:51 +0100302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 return ide_stopped;
304}
305
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200306static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq)
307{
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200308 u8 cmd = rq->cmd[0];
309
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200310 switch (cmd) {
Bartlomiej Zolnierkiewicz1bc6daa2009-03-24 23:22:44 +0100311 case REQ_PARK_HEADS:
312 case REQ_UNPARK_HEADS:
313 return ide_do_park_unpark(drive, rq);
Elias Oltmanns92f1f8f2008-10-10 22:39:40 +0200314 case REQ_DEVSET_EXEC:
Bartlomiej Zolnierkiewicz1bc6daa2009-03-24 23:22:44 +0100315 return ide_do_devset(drive, rq);
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200316 case REQ_DRIVE_RESET:
317 return ide_do_reset(drive);
318 default:
Bartlomiej Zolnierkiewicz17137882009-03-27 12:46:42 +0100319 BUG();
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200320 }
321}
322
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323/**
324 * start_request - start of I/O and command issuing for IDE
325 *
326 * start_request() initiates handling of a new I/O request. It
Bartlomiej Zolnierkiewicz3c619ff2008-10-10 22:39:22 +0200327 * accepts commands and I/O (read/write) requests.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 *
329 * FIXME: this function needs a rename
330 */
331
332static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
333{
334 ide_startstop_t startstop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Jens Axboe4aff5e22006-08-10 08:44:47 +0200336 BUG_ON(!blk_rq_started(rq));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338#ifdef DEBUG
339 printk("%s: start_request: current=0x%08lx\n",
Bartlomiej Zolnierkiewicz898ec222009-01-06 17:20:52 +0100340 drive->hwif->name, (unsigned long) rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341#endif
342
343 /* bail early if we've exceeded max_failures */
344 if (drive->max_failures && (drive->failures > drive->max_failures)) {
Aristeu Rozanskib5e1a4e2008-01-25 22:17:04 +0100345 rq->cmd_flags |= REQ_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 goto kill_rq;
347 }
348
Jens Axboead3cadd2006-06-13 08:46:57 +0200349 if (blk_pm_request(rq))
350 ide_check_pm_state(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Sergei Shtylyovfdd88f02009-03-31 20:15:33 +0200352 drive->hwif->tp_ops->dev_select(drive);
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200353 if (ide_wait_stat(&startstop, drive, drive->ready_stat,
354 ATA_BUSY | ATA_DRQ, WAIT_READY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 printk(KERN_ERR "%s: drive not ready for command\n", drive->name);
356 return startstop;
357 }
358 if (!drive->special.all) {
Bartlomiej Zolnierkiewicz7f3c8682009-01-06 17:20:53 +0100359 struct ide_driver *drv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200361 /*
362 * We reset the drive so we need to issue a SETFEATURES.
363 * Do it _after_ do_special() restored device parameters.
364 */
365 if (drive->current_speed == 0xff)
366 ide_config_drive_speed(drive, drive->desired_speed);
367
Bartlomiej Zolnierkiewicz7267c332008-01-26 20:13:13 +0100368 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 return execute_drive_cmd(drive, rq);
370 else if (blk_pm_request(rq)) {
Jens Axboec00895a2006-09-30 20:29:12 +0200371 struct request_pm_state *pm = rq->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372#ifdef DEBUG_PM
373 printk("%s: start_power_step(step: %d)\n",
Bartlomiej Zolnierkiewicz6b7d8fc2008-12-02 20:40:03 +0100374 drive->name, pm->pm_step);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375#endif
376 startstop = ide_start_power_step(drive, rq);
377 if (startstop == ide_stopped &&
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200378 pm->pm_step == IDE_PM_COMPLETED)
Bartlomiej Zolnierkiewicz3616b652009-03-27 12:46:29 +0100379 ide_complete_pm_rq(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 return startstop;
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200381 } else if (!rq->rq_disk && blk_special_request(rq))
382 /*
383 * TODO: Once all ULDs have been modified to
384 * check for specific op codes rather than
385 * blindly accepting any special request, the
386 * check for ->rq_disk above may be replaced
387 * by a more suitable mechanism or even
388 * dropped entirely.
389 */
390 return ide_special_rq(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
Bartlomiej Zolnierkiewicz7f3c8682009-01-06 17:20:53 +0100392 drv = *(struct ide_driver **)rq->rq_disk->private_data;
Bartlomiej Zolnierkiewicz3c619ff2008-10-10 22:39:22 +0200393
394 return drv->do_request(drive, rq, rq->sector);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 }
396 return do_special(drive);
397kill_rq:
398 ide_kill_rq(drive, rq);
399 return ide_stopped;
400}
401
402/**
403 * ide_stall_queue - pause an IDE device
404 * @drive: drive to stall
405 * @timeout: time to stall for (jiffies)
406 *
407 * ide_stall_queue() can be used by a drive to give excess bandwidth back
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100408 * to the port by sleeping for timeout jiffies.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 */
410
411void ide_stall_queue (ide_drive_t *drive, unsigned long timeout)
412{
413 if (timeout > WAIT_WORSTCASE)
414 timeout = WAIT_WORSTCASE;
415 drive->sleep = timeout + jiffies;
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200416 drive->dev_flags |= IDE_DFLAG_SLEEPING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418EXPORT_SYMBOL(ide_stall_queue);
419
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100420static inline int ide_lock_port(ide_hwif_t *hwif)
421{
422 if (hwif->busy)
423 return 1;
424
425 hwif->busy = 1;
426
427 return 0;
428}
429
430static inline void ide_unlock_port(ide_hwif_t *hwif)
431{
432 hwif->busy = 0;
433}
434
435static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif)
436{
437 int rc = 0;
438
439 if (host->host_flags & IDE_HFLAG_SERIALIZE) {
440 rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy);
441 if (rc == 0) {
Bartlomiej Zolnierkiewicze354c1d2009-03-27 12:46:22 +0100442 if (host->get_lock)
443 host->get_lock(ide_intr, hwif);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100444 }
445 }
446 return rc;
447}
448
449static inline void ide_unlock_host(struct ide_host *host)
450{
451 if (host->host_flags & IDE_HFLAG_SERIALIZE) {
Bartlomiej Zolnierkiewicze354c1d2009-03-27 12:46:22 +0100452 if (host->release_lock)
453 host->release_lock();
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100454 clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy);
455 }
456}
457
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458/*
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100459 * Issue a new request to a device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 */
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100461void do_ide_request(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462{
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100463 ide_drive_t *drive = q->queuedata;
464 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100465 struct ide_host *host = hwif->host;
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100466 struct request *rq = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 ide_startstop_t startstop;
468
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100469 /*
470 * drive is doing pre-flush, ordered write, post-flush sequence. even
471 * though that is 3 requests, it must be seen as a single transaction.
472 * we must not preempt this drive until that is complete
473 */
474 if (blk_queue_flushing(q))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 /*
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100476 * small race where queue could get replugged during
477 * the 3-request flush cycle, just yank the plug since
478 * we want it to finish asap
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 */
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100480 blk_remove_plug(q);
481
482 spin_unlock_irq(q->queue_lock);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100483
484 if (ide_lock_host(host, hwif))
485 goto plug_device_2;
486
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100487 spin_lock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100488
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100489 if (!ide_lock_port(hwif)) {
Bartlomiej Zolnierkiewicz42cf2612009-01-06 17:20:47 +0100490 ide_hwif_t *prev_port;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100491repeat:
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100492 prev_port = hwif->host->cur_port;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100493 hwif->rq = NULL;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100494
Elias Oltmanns90109412009-03-31 20:14:56 +0200495 if (drive->dev_flags & IDE_DFLAG_SLEEPING &&
496 time_after(drive->sleep, jiffies)) {
497 ide_unlock_port(hwif);
498 goto plug_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 }
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100500
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100501 if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) &&
502 hwif != prev_port) {
Bartlomiej Zolnierkiewicz7299a392008-01-25 22:17:14 +0100503 /*
Bartlomiej Zolnierkiewicz42cf2612009-01-06 17:20:47 +0100504 * set nIEN for previous port, drives in the
Bartlomiej Zolnierkiewicz7299a392008-01-25 22:17:14 +0100505 * quirk_list may not like intr setups/cleanups
506 */
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100507 if (prev_port && prev_port->cur_dev->quirk_list == 0)
Sergei Shtylyovecf3a312009-03-31 20:15:30 +0200508 prev_port->tp_ops->write_devctl(prev_port,
509 ATA_NIEN |
510 ATA_DEVCTL_OBS);
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100511
512 hwif->host->cur_port = hwif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 }
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100514 hwif->cur_dev = drive;
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200515 drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100517 spin_unlock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100518 spin_lock_irq(q->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 /*
520 * we know that the queue isn't empty, but this can happen
521 * if the q->prep_rq_fn() decides to kill a request
522 */
523 rq = elv_next_request(drive->queue);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100524 spin_unlock_irq(q->queue_lock);
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100525 spin_lock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 if (!rq) {
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100528 ide_unlock_port(hwif);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100529 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 }
531
532 /*
533 * Sanity: don't accept a request that isn't a PM request
534 * if we are currently power managed. This is very important as
535 * blk_stop_queue() doesn't prevent the elv_next_request()
536 * above to return us whatever is in the queue. Since we call
537 * ide_do_request() ourselves, we end up taking requests while
538 * the queue is blocked...
539 *
540 * We let requests forced at head of queue with ide-preempt
541 * though. I hope that doesn't happen too much, hopefully not
542 * unless the subdriver triggers such a thing in its own PM
543 * state machine.
544 */
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200545 if ((drive->dev_flags & IDE_DFLAG_BLOCKED) &&
546 blk_pm_request(rq) == 0 &&
547 (rq->cmd_flags & REQ_PREEMPT) == 0) {
Bartlomiej Zolnierkiewicz631de372009-01-02 16:12:50 +0100548 /* there should be no pending command at this point */
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100549 ide_unlock_port(hwif);
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100550 goto plug_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 }
552
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100553 hwif->rq = rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100555 spin_unlock_irq(&hwif->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 startstop = start_request(drive, rq);
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100557 spin_lock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100558
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100559 if (startstop == ide_stopped)
560 goto repeat;
561 } else
562 goto plug_device;
563out:
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100564 spin_unlock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100565 if (rq == NULL)
566 ide_unlock_host(host);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100567 spin_lock_irq(q->queue_lock);
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100568 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100570plug_device:
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100571 spin_unlock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100572 ide_unlock_host(host);
573plug_device_2:
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100574 spin_lock_irq(q->queue_lock);
575
576 if (!elv_queue_empty(q))
577 blk_plug_device(q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578}
579
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100580static void ide_plug_device(ide_drive_t *drive)
581{
582 struct request_queue *q = drive->queue;
583 unsigned long flags;
584
585 spin_lock_irqsave(q->queue_lock, flags);
586 if (!elv_queue_empty(q))
587 blk_plug_device(q);
588 spin_unlock_irqrestore(q->queue_lock, flags);
589}
590
Bartlomiej Zolnierkiewiczb6a45a02009-03-24 23:22:43 +0100591static int drive_is_ready(ide_drive_t *drive)
592{
593 ide_hwif_t *hwif = drive->hwif;
594 u8 stat = 0;
595
596 if (drive->waiting_for_dma)
597 return hwif->dma_ops->dma_test_irq(drive);
598
599 if (hwif->io_ports.ctl_addr &&
600 (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0)
601 stat = hwif->tp_ops->read_altstatus(hwif);
602 else
603 /* Note: this may clear a pending IRQ!! */
604 stat = hwif->tp_ops->read_status(hwif);
605
606 if (stat & ATA_BUSY)
607 /* drive busy: definitely not interrupting */
608 return 0;
609
610 /* drive ready: *might* be interrupting */
611 return 1;
612}
613
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614/**
615 * ide_timer_expiry - handle lack of an IDE interrupt
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100616 * @data: timer callback magic (hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 *
618 * An IDE command has timed out before the expected drive return
619 * occurred. At this point we attempt to clean up the current
620 * mess. If the current handler includes an expiry handler then
621 * we invoke the expiry handler, and providing it is happy the
622 * work is done. If that fails we apply generic recovery rules
623 * invoking the handler and checking the drive DMA status. We
624 * have an excessively incestuous relationship with the DMA
625 * logic that wants cleaning up.
626 */
627
628void ide_timer_expiry (unsigned long data)
629{
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100630 ide_hwif_t *hwif = (ide_hwif_t *)data;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100631 ide_drive_t *uninitialized_var(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 ide_handler_t *handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 unsigned long flags;
Roel Kluine0c6dcd2009-03-05 16:10:55 +0100634 int wait = -1;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100635 int plug_device = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100637 spin_lock_irqsave(&hwif->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100639 handler = hwif->handler;
640
641 if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 /*
643 * Either a marginal timeout occurred
644 * (got the interrupt just as timer expired),
645 * or we were "sleeping" to give other devices a chance.
646 * Either way, we don't really want to complain about anything.
647 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 } else {
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100649 ide_expiry_t *expiry = hwif->expiry;
650 ide_startstop_t startstop = ide_stopped;
Bartlomiej Zolnierkiewiczb2cfb052009-01-02 16:12:49 +0100651
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100652 drive = hwif->cur_dev;
653
654 if (expiry) {
655 wait = expiry(drive);
656 if (wait > 0) { /* continue */
657 /* reset timer */
658 hwif->timer.expires = jiffies + wait;
659 hwif->req_gen_timer = hwif->req_gen;
660 add_timer(&hwif->timer);
661 spin_unlock_irqrestore(&hwif->lock, flags);
662 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 }
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100664 }
665 hwif->handler = NULL;
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100666 hwif->expiry = NULL;
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100667 /*
668 * We need to simulate a real interrupt when invoking
669 * the handler() function, which means we need to
670 * globally mask the specific IRQ:
671 */
672 spin_unlock(&hwif->lock);
673 /* disable_irq_nosync ?? */
674 disable_irq(hwif->irq);
675 /* local CPU only, as if we were handling an interrupt */
676 local_irq_disable();
677 if (hwif->polling) {
678 startstop = handler(drive);
679 } else if (drive_is_ready(drive)) {
680 if (drive->waiting_for_dma)
681 hwif->dma_ops->dma_lost_irq(drive);
Bartlomiej Zolnierkiewiczd15a6132009-03-27 12:46:21 +0100682 if (hwif->ack_intr)
683 hwif->ack_intr(hwif);
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100684 printk(KERN_WARNING "%s: lost interrupt\n",
685 drive->name);
686 startstop = handler(drive);
687 } else {
688 if (drive->waiting_for_dma)
689 startstop = ide_dma_timeout_retry(drive, wait);
690 else
691 startstop = ide_error(drive, "irq timeout",
692 hwif->tp_ops->read_status(hwif));
693 }
694 spin_lock_irq(&hwif->lock);
695 enable_irq(hwif->irq);
696 if (startstop == ide_stopped) {
697 ide_unlock_port(hwif);
698 plug_device = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 }
700 }
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100701 spin_unlock_irqrestore(&hwif->lock, flags);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100702
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100703 if (plug_device) {
704 ide_unlock_host(hwif->host);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100705 ide_plug_device(drive);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100706 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707}
708
709/**
710 * unexpected_intr - handle an unexpected IDE interrupt
711 * @irq: interrupt line
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100712 * @hwif: port being processed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 *
714 * There's nothing really useful we can do with an unexpected interrupt,
715 * other than reading the status register (to clear it), and logging it.
716 * There should be no way that an irq can happen before we're ready for it,
717 * so we needn't worry much about losing an "important" interrupt here.
718 *
719 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
720 * the drive enters "idle", "standby", or "sleep" mode, so if the status
721 * looks "good", we just ignore the interrupt completely.
722 *
723 * This routine assumes __cli() is in effect when called.
724 *
725 * If an unexpected interrupt happens on irq15 while we are handling irq14
726 * and if the two interfaces are "serialized" (CMD640), then it looks like
727 * we could screw up by interfering with a new request being set up for
728 * irq15.
729 *
730 * In reality, this is a non-issue. The new command is not sent unless
731 * the drive is ready to accept one, in which case we know the drive is
732 * not trying to interrupt us. And ide_set_handler() is always invoked
733 * before completing the issuance of any new drive command, so we will not
734 * be accidentally invoked as a result of any valid command completion
735 * interrupt.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 */
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100737
738static void unexpected_intr(int irq, ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739{
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100740 u8 stat = hwif->tp_ops->read_status(hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100742 if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) {
743 /* Try to not flood the console with msgs */
744 static unsigned long last_msgtime, count;
745 ++count;
Bartlomiej Zolnierkiewiczb73c7ee2008-07-23 19:55:52 +0200746
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100747 if (time_after(jiffies, last_msgtime + HZ)) {
748 last_msgtime = jiffies;
749 printk(KERN_ERR "%s: unexpected interrupt, "
750 "status=0x%02x, count=%ld\n",
751 hwif->name, stat, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 }
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100753 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754}
755
756/**
757 * ide_intr - default IDE interrupt handler
758 * @irq: interrupt number
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100759 * @dev_id: hwif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 * @regs: unused weirdness from the kernel irq layer
761 *
762 * This is the default IRQ handler for the IDE layer. You should
763 * not need to override it. If you do be aware it is subtle in
764 * places
765 *
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100766 * hwif is the interface in the group currently performing
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100767 * a command. hwif->cur_dev is the drive and hwif->handler is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 * the IRQ handler to call. As we issue a command the handlers
769 * step through multiple states, reassigning the handler to the
770 * next step in the process. Unlike a smart SCSI controller IDE
771 * expects the main processor to sequence the various transfer
772 * stages. We also manage a poll timer to catch up with most
773 * timeout situations. There are still a few where the handlers
774 * don't ever decide to give up.
775 *
776 * The handler eventually returns ide_stopped to indicate the
777 * request completed. At this point we issue the next request
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100778 * on the port and the process begins again.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 */
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100780
David Howells7d12e782006-10-05 14:55:46 +0100781irqreturn_t ide_intr (int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782{
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100783 ide_hwif_t *hwif = (ide_hwif_t *)dev_id;
Bartlomiej Zolnierkiewicz255115fb2009-03-27 12:46:27 +0100784 struct ide_host *host = hwif->host;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100785 ide_drive_t *uninitialized_var(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 ide_handler_t *handler;
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100787 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 ide_startstop_t startstop;
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100789 irqreturn_t irq_ret = IRQ_NONE;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100790 int plug_device = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791
Bartlomiej Zolnierkiewicz255115fb2009-03-27 12:46:27 +0100792 if (host->host_flags & IDE_HFLAG_SERIALIZE) {
793 if (hwif != host->cur_port)
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100794 goto out_early;
795 }
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100796
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100797 spin_lock_irqsave(&hwif->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798
Bartlomiej Zolnierkiewiczd15a6132009-03-27 12:46:21 +0100799 if (hwif->ack_intr && hwif->ack_intr(hwif) == 0)
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100800 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100802 handler = hwif->handler;
803
804 if (handler == NULL || hwif->polling) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 /*
806 * Not expecting an interrupt from this drive.
807 * That means this could be:
808 * (1) an interrupt from another PCI device
809 * sharing the same PCI INT# as us.
810 * or (2) a drive just entered sleep or standby mode,
811 * and is interrupting to let us know.
812 * or (3) a spurious interrupt of unknown origin.
813 *
814 * For PCI, we cannot tell the difference,
815 * so in that case we just ignore it and hope it goes away.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 */
Bartlomiej Zolnierkiewicz255115fb2009-03-27 12:46:27 +0100817 if ((host->irq_flags & IRQF_SHARED) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 /*
819 * Probably not a shared PCI interrupt,
820 * so we can safely try to do something about it:
821 */
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100822 unexpected_intr(irq, hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 } else {
824 /*
825 * Whack the status register, just in case
826 * we have a leftover pending IRQ.
827 */
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200828 (void)hwif->tp_ops->read_status(hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 }
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100830 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 }
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100832
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100833 drive = hwif->cur_dev;
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100834
835 if (!drive_is_ready(drive))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 /*
837 * This happens regularly when we share a PCI IRQ with
838 * another device. Unfortunately, it can also happen
839 * with some buggy drives that trigger the IRQ before
840 * their status register is up to date. Hopefully we have
841 * enough advance overhead that the latter isn't a problem.
842 */
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100843 goto out;
844
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100845 hwif->handler = NULL;
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100846 hwif->expiry = NULL;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100847 hwif->req_gen++;
848 del_timer(&hwif->timer);
849 spin_unlock(&hwif->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
Bartlomiej Zolnierkiewiczbfa7d8e2008-10-13 21:39:42 +0200851 if (hwif->port_ops && hwif->port_ops->clear_irq)
852 hwif->port_ops->clear_irq(drive);
Albert Leef0dd8712007-02-17 02:40:21 +0100853
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200854 if (drive->dev_flags & IDE_DFLAG_UNMASK)
Ingo Molnar366c7f52006-07-03 00:25:25 -0700855 local_irq_enable_in_hardirq();
Bartlomiej Zolnierkiewiczbfa7d8e2008-10-13 21:39:42 +0200856
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 /* service this interrupt, may set handler for next interrupt */
858 startstop = handler(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100860 spin_lock_irq(&hwif->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 /*
862 * Note that handler() may have set things up for another
863 * interrupt to occur soon, but it cannot happen until
864 * we exit from this routine, because it will be the
865 * same irq as is currently being serviced here, and Linux
866 * won't allow another of the same (on any CPU) until we return.
867 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 if (startstop == ide_stopped) {
Bartlomiej Zolnierkiewicz9600dcf2009-01-06 17:20:58 +0100869 BUG_ON(hwif->handler);
870 ide_unlock_port(hwif);
871 plug_device = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 }
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100873 irq_ret = IRQ_HANDLED;
874out:
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100875 spin_unlock_irqrestore(&hwif->lock, flags);
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100876out_early:
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100877 if (plug_device) {
878 ide_unlock_host(hwif->host);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100879 ide_plug_device(drive);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100880 }
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100881
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100882 return irq_ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883}
Stanislaw Gruszka849d7132009-03-05 16:10:57 +0100884EXPORT_SYMBOL_GPL(ide_intr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +0200886void ide_pad_transfer(ide_drive_t *drive, int write, int len)
887{
888 ide_hwif_t *hwif = drive->hwif;
889 u8 buf[4] = { 0 };
890
891 while (len > 0) {
892 if (write)
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200893 hwif->tp_ops->output_data(drive, NULL, buf, min(4, len));
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +0200894 else
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200895 hwif->tp_ops->input_data(drive, NULL, buf, min(4, len));
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +0200896 len -= 4;
897 }
898}
899EXPORT_SYMBOL_GPL(ide_pad_transfer);