blob: 6415a2e2ba87febae0cfa6e9b8342f2dbd190748 [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 Zolnierkiewicz130e8862009-03-27 12:46:45 +0100115/* obsolete, blk_rq_bytes() should be used instead */
116unsigned int ide_rq_bytes(struct request *rq)
117{
118 if (blk_pc_request(rq))
119 return rq->data_len;
120 else
121 return rq->hard_cur_sectors << 9;
122}
123EXPORT_SYMBOL_GPL(ide_rq_bytes);
124
Bartlomiej Zolnierkiewiczf974b192009-03-27 12:46:44 +0100125int ide_complete_rq(ide_drive_t *drive, int error, unsigned int nr_bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100127 ide_hwif_t *hwif = drive->hwif;
128 struct request *rq = hwif->rq;
Bartlomiej Zolnierkiewicza9587fd2009-03-27 12:46:44 +0100129 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Bartlomiej Zolnierkiewicz130e8862009-03-27 12:46:45 +0100131 /*
132 * if failfast is set on a request, override number of sectors
133 * and complete the whole request right now
134 */
135 if (blk_noretry_request(rq) && error <= 0)
136 nr_bytes = rq->hard_nr_sectors << 9;
137
Bartlomiej Zolnierkiewiczba7d4792009-03-27 12:46:44 +0100138 rc = ide_end_rq(drive, rq, error, nr_bytes);
Bartlomiej Zolnierkiewicza9587fd2009-03-27 12:46:44 +0100139 if (rc == 0)
140 hwif->rq = NULL;
Bartlomiej Zolnierkiewicz1d0bf582008-12-29 20:27:30 +0100141
Bartlomiej Zolnierkiewicza9587fd2009-03-27 12:46:44 +0100142 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143}
Bartlomiej Zolnierkiewicza09485d2009-03-27 12:46:31 +0100144EXPORT_SYMBOL(ide_complete_rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Bartlomiej Zolnierkiewicz327fa1c2009-03-24 23:22:47 +0100146void ide_kill_rq(ide_drive_t *drive, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147{
Bartlomiej Zolnierkiewicz3ee38302009-03-27 12:46:36 +0100148 u8 drv_req = blk_special_request(rq) && rq->rq_disk;
149 u8 media = drive->media;
150
Bartlomiej Zolnierkiewiczc152cc12009-03-27 12:46:34 +0100151 drive->failed_pc = NULL;
152
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100153 if ((media == ide_floppy || media == ide_tape) && drv_req) {
154 rq->errors = 0;
Bartlomiej Zolnierkiewiczf974b192009-03-27 12:46:44 +0100155 ide_complete_rq(drive, 0, blk_rq_bytes(rq));
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100156 } else {
157 if (media == ide_tape)
158 rq->errors = IDE_DRV_ERROR_GENERAL;
Bartlomiej Zolnierkiewicz89f78b32009-03-27 12:46:43 +0100159 else if (blk_fs_request(rq) == 0 && rq->errors == 0)
160 rq->errors = -EIO;
Bartlomiej Zolnierkiewicz130e8862009-03-27 12:46:45 +0100161 ide_complete_rq(drive, -EIO, ide_rq_bytes(rq));
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100162 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163}
164
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100165static void ide_tf_set_specify_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;
168 tf->lbal = drive->sect;
169 tf->lbam = drive->cyl;
170 tf->lbah = drive->cyl >> 8;
Bartlomiej Zolnierkiewicz7f612f22008-10-13 21:39:40 +0200171 tf->device = (drive->head - 1) | drive->select;
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200172 tf->command = ATA_CMD_INIT_DEV_PARAMS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173}
174
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100175static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100177 tf->nsect = drive->sect;
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200178 tf->command = ATA_CMD_RESTORE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179}
180
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100181static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100183 tf->nsect = drive->mult_req;
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200184 tf->command = ATA_CMD_SET_MULTI;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185}
186
187static ide_startstop_t ide_disk_special(ide_drive_t *drive)
188{
189 special_t *s = &drive->special;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100190 struct ide_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100192 memset(&cmd, 0, sizeof(cmd));
Bartlomiej Zolnierkiewicz0dfb9912009-03-27 12:46:39 +0100193 cmd.protocol = ATA_PROT_NODATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195 if (s->b.set_geometry) {
196 s->b.set_geometry = 0;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100197 ide_tf_set_specify_cmd(drive, &cmd.tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 } else if (s->b.recalibrate) {
199 s->b.recalibrate = 0;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100200 ide_tf_set_restore_cmd(drive, &cmd.tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 } else if (s->b.set_multmode) {
202 s->b.set_multmode = 0;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100203 ide_tf_set_setmult_cmd(drive, &cmd.tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 } else if (s->all) {
205 int special = s->all;
206 s->all = 0;
207 printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special);
208 return ide_stopped;
209 }
210
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200211 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
212 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
213 cmd.tf_flags = IDE_TFLAG_CUSTOM_HANDLER;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100214
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100215 do_rw_taskfile(drive, &cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
217 return ide_started;
218}
219
220/**
221 * do_special - issue some special commands
222 * @drive: drive the command is for
223 *
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200224 * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS,
225 * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive.
226 *
227 * It used to do much more, but has been scaled back.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 */
229
230static ide_startstop_t do_special (ide_drive_t *drive)
231{
232 special_t *s = &drive->special;
233
234#ifdef DEBUG
235 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
236#endif
Bartlomiej Zolnierkiewicz6982daf2008-10-13 21:39:40 +0200237 if (drive->media == ide_disk)
238 return ide_disk_special(drive);
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200239
Bartlomiej Zolnierkiewicz6982daf2008-10-13 21:39:40 +0200240 s->all = 0;
241 drive->mult_req = 0;
242 return ide_stopped;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243}
244
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100245void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
247 ide_hwif_t *hwif = drive->hwif;
248 struct scatterlist *sg = hwif->sg_table;
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100249 struct request *rq = cmd->rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Borislav Petkov9e772d02009-02-02 20:12:21 +0100251 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE);
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100253 cmd->sg_nents = 1;
Borislav Petkov9e772d02009-02-02 20:12:21 +0100254 } else if (!rq->bio) {
255 sg_init_one(sg, rq->data, rq->data_len);
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100256 cmd->sg_nents = 1;
257 } else
258 cmd->sg_nents = blk_rq_map_sg(drive->queue, rq, sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260EXPORT_SYMBOL_GPL(ide_map_sg);
261
Bartlomiej Zolnierkiewiczbf717c02009-03-27 12:46:47 +0100262void ide_init_sg_cmd(struct ide_cmd *cmd, unsigned int nr_bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
Bartlomiej Zolnierkiewiczbf717c02009-03-27 12:46:47 +0100264 cmd->nbytes = cmd->nleft = nr_bytes;
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100265 cmd->cursg_ofs = 0;
266 cmd->cursg = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268EXPORT_SYMBOL_GPL(ide_init_sg_cmd);
269
270/**
271 * execute_drive_command - issue special drive command
Adrian Bunk338cec32005-09-10 00:26:54 -0700272 * @drive: the drive to issue the command on
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 * @rq: the request structure holding the command
274 *
275 * execute_drive_cmd() issues a special drive command, usually
276 * initiated by ioctl() from the external hdparm program. The
277 * command can be a drive command, drive task or taskfile
278 * operation. Weirdly you can call it with NULL to wait for
279 * all commands to finish. Don't do this as that is due to change
280 */
281
282static ide_startstop_t execute_drive_cmd (ide_drive_t *drive,
283 struct request *rq)
284{
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100285 struct ide_cmd *cmd = rq->special;
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100286
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100287 if (cmd) {
Bartlomiej Zolnierkiewicz0dfb9912009-03-27 12:46:39 +0100288 if (cmd->protocol == ATA_PROT_PIO) {
Bartlomiej Zolnierkiewiczbf717c02009-03-27 12:46:47 +0100289 ide_init_sg_cmd(cmd, rq->nr_sectors << 9);
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100290 ide_map_sg(drive, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 }
292
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100293 return do_rw_taskfile(drive, cmd);
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100294 }
295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 /*
297 * NULL is actually a valid way of waiting for
298 * all current requests to be flushed from the queue.
299 */
300#ifdef DEBUG
301 printk("%s: DRIVE_CMD (null)\n", drive->name);
302#endif
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100303 rq->errors = 0;
Bartlomiej Zolnierkiewiczf974b192009-03-27 12:46:44 +0100304 ide_complete_rq(drive, 0, blk_rq_bytes(rq));
Bartlomiej Zolnierkiewicz64a57fe2008-02-06 02:57:51 +0100305
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 return ide_stopped;
307}
308
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200309static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq)
310{
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200311 u8 cmd = rq->cmd[0];
312
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200313 switch (cmd) {
Bartlomiej Zolnierkiewicz1bc6daa2009-03-24 23:22:44 +0100314 case REQ_PARK_HEADS:
315 case REQ_UNPARK_HEADS:
316 return ide_do_park_unpark(drive, rq);
Elias Oltmanns92f1f8f2008-10-10 22:39:40 +0200317 case REQ_DEVSET_EXEC:
Bartlomiej Zolnierkiewicz1bc6daa2009-03-24 23:22:44 +0100318 return ide_do_devset(drive, rq);
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200319 case REQ_DRIVE_RESET:
320 return ide_do_reset(drive);
321 default:
Bartlomiej Zolnierkiewicz17137882009-03-27 12:46:42 +0100322 BUG();
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200323 }
324}
325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326/**
327 * start_request - start of I/O and command issuing for IDE
328 *
329 * start_request() initiates handling of a new I/O request. It
Bartlomiej Zolnierkiewicz3c619ff2008-10-10 22:39:22 +0200330 * accepts commands and I/O (read/write) requests.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 *
332 * FIXME: this function needs a rename
333 */
334
335static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
336{
337 ide_startstop_t startstop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Jens Axboe4aff5e22006-08-10 08:44:47 +0200339 BUG_ON(!blk_rq_started(rq));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
341#ifdef DEBUG
342 printk("%s: start_request: current=0x%08lx\n",
Bartlomiej Zolnierkiewicz898ec222009-01-06 17:20:52 +0100343 drive->hwif->name, (unsigned long) rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344#endif
345
346 /* bail early if we've exceeded max_failures */
347 if (drive->max_failures && (drive->failures > drive->max_failures)) {
Aristeu Rozanskib5e1a4e2008-01-25 22:17:04 +0100348 rq->cmd_flags |= REQ_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 goto kill_rq;
350 }
351
Jens Axboead3cadd2006-06-13 08:46:57 +0200352 if (blk_pm_request(rq))
353 ide_check_pm_state(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
Sergei Shtylyovfdd88f02009-03-31 20:15:33 +0200355 drive->hwif->tp_ops->dev_select(drive);
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200356 if (ide_wait_stat(&startstop, drive, drive->ready_stat,
357 ATA_BUSY | ATA_DRQ, WAIT_READY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 printk(KERN_ERR "%s: drive not ready for command\n", drive->name);
359 return startstop;
360 }
361 if (!drive->special.all) {
Bartlomiej Zolnierkiewicz7f3c8682009-01-06 17:20:53 +0100362 struct ide_driver *drv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200364 /*
365 * We reset the drive so we need to issue a SETFEATURES.
366 * Do it _after_ do_special() restored device parameters.
367 */
368 if (drive->current_speed == 0xff)
369 ide_config_drive_speed(drive, drive->desired_speed);
370
Bartlomiej Zolnierkiewicz7267c332008-01-26 20:13:13 +0100371 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 return execute_drive_cmd(drive, rq);
373 else if (blk_pm_request(rq)) {
Jens Axboec00895a2006-09-30 20:29:12 +0200374 struct request_pm_state *pm = rq->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375#ifdef DEBUG_PM
376 printk("%s: start_power_step(step: %d)\n",
Bartlomiej Zolnierkiewicz6b7d8fc2008-12-02 20:40:03 +0100377 drive->name, pm->pm_step);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378#endif
379 startstop = ide_start_power_step(drive, rq);
380 if (startstop == ide_stopped &&
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200381 pm->pm_step == IDE_PM_COMPLETED)
Bartlomiej Zolnierkiewicz3616b652009-03-27 12:46:29 +0100382 ide_complete_pm_rq(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 return startstop;
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200384 } else if (!rq->rq_disk && blk_special_request(rq))
385 /*
386 * TODO: Once all ULDs have been modified to
387 * check for specific op codes rather than
388 * blindly accepting any special request, the
389 * check for ->rq_disk above may be replaced
390 * by a more suitable mechanism or even
391 * dropped entirely.
392 */
393 return ide_special_rq(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
Bartlomiej Zolnierkiewicz7f3c8682009-01-06 17:20:53 +0100395 drv = *(struct ide_driver **)rq->rq_disk->private_data;
Bartlomiej Zolnierkiewicz3c619ff2008-10-10 22:39:22 +0200396
397 return drv->do_request(drive, rq, rq->sector);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 }
399 return do_special(drive);
400kill_rq:
401 ide_kill_rq(drive, rq);
402 return ide_stopped;
403}
404
405/**
406 * ide_stall_queue - pause an IDE device
407 * @drive: drive to stall
408 * @timeout: time to stall for (jiffies)
409 *
410 * ide_stall_queue() can be used by a drive to give excess bandwidth back
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100411 * to the port by sleeping for timeout jiffies.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 */
413
414void ide_stall_queue (ide_drive_t *drive, unsigned long timeout)
415{
416 if (timeout > WAIT_WORSTCASE)
417 timeout = WAIT_WORSTCASE;
418 drive->sleep = timeout + jiffies;
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200419 drive->dev_flags |= IDE_DFLAG_SLEEPING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421EXPORT_SYMBOL(ide_stall_queue);
422
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100423static inline int ide_lock_port(ide_hwif_t *hwif)
424{
425 if (hwif->busy)
426 return 1;
427
428 hwif->busy = 1;
429
430 return 0;
431}
432
433static inline void ide_unlock_port(ide_hwif_t *hwif)
434{
435 hwif->busy = 0;
436}
437
438static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif)
439{
440 int rc = 0;
441
442 if (host->host_flags & IDE_HFLAG_SERIALIZE) {
443 rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy);
444 if (rc == 0) {
Bartlomiej Zolnierkiewicze354c1d2009-03-27 12:46:22 +0100445 if (host->get_lock)
446 host->get_lock(ide_intr, hwif);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100447 }
448 }
449 return rc;
450}
451
452static inline void ide_unlock_host(struct ide_host *host)
453{
454 if (host->host_flags & IDE_HFLAG_SERIALIZE) {
Bartlomiej Zolnierkiewicze354c1d2009-03-27 12:46:22 +0100455 if (host->release_lock)
456 host->release_lock();
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100457 clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy);
458 }
459}
460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461/*
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100462 * Issue a new request to a device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 */
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100464void do_ide_request(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465{
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100466 ide_drive_t *drive = q->queuedata;
467 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100468 struct ide_host *host = hwif->host;
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100469 struct request *rq = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 ide_startstop_t startstop;
471
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100472 /*
473 * drive is doing pre-flush, ordered write, post-flush sequence. even
474 * though that is 3 requests, it must be seen as a single transaction.
475 * we must not preempt this drive until that is complete
476 */
477 if (blk_queue_flushing(q))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 /*
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100479 * small race where queue could get replugged during
480 * the 3-request flush cycle, just yank the plug since
481 * we want it to finish asap
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 */
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100483 blk_remove_plug(q);
484
485 spin_unlock_irq(q->queue_lock);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100486
487 if (ide_lock_host(host, hwif))
488 goto plug_device_2;
489
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100490 spin_lock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100491
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100492 if (!ide_lock_port(hwif)) {
Bartlomiej Zolnierkiewicz42cf2612009-01-06 17:20:47 +0100493 ide_hwif_t *prev_port;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100494repeat:
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100495 prev_port = hwif->host->cur_port;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100496 hwif->rq = NULL;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100497
Elias Oltmanns90109412009-03-31 20:14:56 +0200498 if (drive->dev_flags & IDE_DFLAG_SLEEPING &&
499 time_after(drive->sleep, jiffies)) {
500 ide_unlock_port(hwif);
501 goto plug_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 }
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100503
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100504 if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) &&
505 hwif != prev_port) {
Bartlomiej Zolnierkiewicz7299a392008-01-25 22:17:14 +0100506 /*
Bartlomiej Zolnierkiewicz42cf2612009-01-06 17:20:47 +0100507 * set nIEN for previous port, drives in the
Bartlomiej Zolnierkiewicz7299a392008-01-25 22:17:14 +0100508 * quirk_list may not like intr setups/cleanups
509 */
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100510 if (prev_port && prev_port->cur_dev->quirk_list == 0)
Sergei Shtylyovecf3a312009-03-31 20:15:30 +0200511 prev_port->tp_ops->write_devctl(prev_port,
512 ATA_NIEN |
513 ATA_DEVCTL_OBS);
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100514
515 hwif->host->cur_port = hwif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 }
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100517 hwif->cur_dev = drive;
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200518 drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100520 spin_unlock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100521 spin_lock_irq(q->queue_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 /*
523 * we know that the queue isn't empty, but this can happen
524 * if the q->prep_rq_fn() decides to kill a request
525 */
526 rq = elv_next_request(drive->queue);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100527 spin_unlock_irq(q->queue_lock);
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100528 spin_lock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100529
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 if (!rq) {
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100531 ide_unlock_port(hwif);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100532 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 }
534
535 /*
536 * Sanity: don't accept a request that isn't a PM request
537 * if we are currently power managed. This is very important as
538 * blk_stop_queue() doesn't prevent the elv_next_request()
539 * above to return us whatever is in the queue. Since we call
540 * ide_do_request() ourselves, we end up taking requests while
541 * the queue is blocked...
542 *
543 * We let requests forced at head of queue with ide-preempt
544 * though. I hope that doesn't happen too much, hopefully not
545 * unless the subdriver triggers such a thing in its own PM
546 * state machine.
547 */
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200548 if ((drive->dev_flags & IDE_DFLAG_BLOCKED) &&
549 blk_pm_request(rq) == 0 &&
550 (rq->cmd_flags & REQ_PREEMPT) == 0) {
Bartlomiej Zolnierkiewicz631de372009-01-02 16:12:50 +0100551 /* there should be no pending command at this point */
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100552 ide_unlock_port(hwif);
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100553 goto plug_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 }
555
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100556 hwif->rq = rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100558 spin_unlock_irq(&hwif->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 startstop = start_request(drive, rq);
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100560 spin_lock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100561
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100562 if (startstop == ide_stopped)
563 goto repeat;
564 } else
565 goto plug_device;
566out:
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100567 spin_unlock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100568 if (rq == NULL)
569 ide_unlock_host(host);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100570 spin_lock_irq(q->queue_lock);
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100571 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100573plug_device:
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100574 spin_unlock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100575 ide_unlock_host(host);
576plug_device_2:
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100577 spin_lock_irq(q->queue_lock);
578
579 if (!elv_queue_empty(q))
580 blk_plug_device(q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581}
582
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100583static void ide_plug_device(ide_drive_t *drive)
584{
585 struct request_queue *q = drive->queue;
586 unsigned long flags;
587
588 spin_lock_irqsave(q->queue_lock, flags);
589 if (!elv_queue_empty(q))
590 blk_plug_device(q);
591 spin_unlock_irqrestore(q->queue_lock, flags);
592}
593
Bartlomiej Zolnierkiewiczb6a45a02009-03-24 23:22:43 +0100594static int drive_is_ready(ide_drive_t *drive)
595{
596 ide_hwif_t *hwif = drive->hwif;
597 u8 stat = 0;
598
599 if (drive->waiting_for_dma)
600 return hwif->dma_ops->dma_test_irq(drive);
601
602 if (hwif->io_ports.ctl_addr &&
603 (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0)
604 stat = hwif->tp_ops->read_altstatus(hwif);
605 else
606 /* Note: this may clear a pending IRQ!! */
607 stat = hwif->tp_ops->read_status(hwif);
608
609 if (stat & ATA_BUSY)
610 /* drive busy: definitely not interrupting */
611 return 0;
612
613 /* drive ready: *might* be interrupting */
614 return 1;
615}
616
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617/**
618 * ide_timer_expiry - handle lack of an IDE interrupt
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100619 * @data: timer callback magic (hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 *
621 * An IDE command has timed out before the expected drive return
622 * occurred. At this point we attempt to clean up the current
623 * mess. If the current handler includes an expiry handler then
624 * we invoke the expiry handler, and providing it is happy the
625 * work is done. If that fails we apply generic recovery rules
626 * invoking the handler and checking the drive DMA status. We
627 * have an excessively incestuous relationship with the DMA
628 * logic that wants cleaning up.
629 */
630
631void ide_timer_expiry (unsigned long data)
632{
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100633 ide_hwif_t *hwif = (ide_hwif_t *)data;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100634 ide_drive_t *uninitialized_var(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 ide_handler_t *handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 unsigned long flags;
Roel Kluine0c6dcd2009-03-05 16:10:55 +0100637 int wait = -1;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100638 int plug_device = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100640 spin_lock_irqsave(&hwif->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100642 handler = hwif->handler;
643
644 if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 /*
646 * Either a marginal timeout occurred
647 * (got the interrupt just as timer expired),
648 * or we were "sleeping" to give other devices a chance.
649 * Either way, we don't really want to complain about anything.
650 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 } else {
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100652 ide_expiry_t *expiry = hwif->expiry;
653 ide_startstop_t startstop = ide_stopped;
Bartlomiej Zolnierkiewiczb2cfb052009-01-02 16:12:49 +0100654
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100655 drive = hwif->cur_dev;
656
657 if (expiry) {
658 wait = expiry(drive);
659 if (wait > 0) { /* continue */
660 /* reset timer */
661 hwif->timer.expires = jiffies + wait;
662 hwif->req_gen_timer = hwif->req_gen;
663 add_timer(&hwif->timer);
664 spin_unlock_irqrestore(&hwif->lock, flags);
665 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 }
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100667 }
668 hwif->handler = NULL;
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100669 hwif->expiry = NULL;
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100670 /*
671 * We need to simulate a real interrupt when invoking
672 * the handler() function, which means we need to
673 * globally mask the specific IRQ:
674 */
675 spin_unlock(&hwif->lock);
676 /* disable_irq_nosync ?? */
677 disable_irq(hwif->irq);
678 /* local CPU only, as if we were handling an interrupt */
679 local_irq_disable();
680 if (hwif->polling) {
681 startstop = handler(drive);
682 } else if (drive_is_ready(drive)) {
683 if (drive->waiting_for_dma)
684 hwif->dma_ops->dma_lost_irq(drive);
Bartlomiej Zolnierkiewiczd15a6132009-03-27 12:46:21 +0100685 if (hwif->ack_intr)
686 hwif->ack_intr(hwif);
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100687 printk(KERN_WARNING "%s: lost interrupt\n",
688 drive->name);
689 startstop = handler(drive);
690 } else {
691 if (drive->waiting_for_dma)
692 startstop = ide_dma_timeout_retry(drive, wait);
693 else
694 startstop = ide_error(drive, "irq timeout",
695 hwif->tp_ops->read_status(hwif));
696 }
697 spin_lock_irq(&hwif->lock);
698 enable_irq(hwif->irq);
Bartlomiej Zolnierkiewicze3b29f02009-05-22 16:23:37 +0200699 if (startstop == ide_stopped && hwif->polling == 0) {
Bartlomiej Zolnierkiewiczc38714e2009-01-06 17:20:59 +0100700 ide_unlock_port(hwif);
701 plug_device = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 }
703 }
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100704 spin_unlock_irqrestore(&hwif->lock, flags);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100705
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100706 if (plug_device) {
707 ide_unlock_host(hwif->host);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100708 ide_plug_device(drive);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100709 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710}
711
712/**
713 * unexpected_intr - handle an unexpected IDE interrupt
714 * @irq: interrupt line
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100715 * @hwif: port being processed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 *
717 * There's nothing really useful we can do with an unexpected interrupt,
718 * other than reading the status register (to clear it), and logging it.
719 * There should be no way that an irq can happen before we're ready for it,
720 * so we needn't worry much about losing an "important" interrupt here.
721 *
722 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
723 * the drive enters "idle", "standby", or "sleep" mode, so if the status
724 * looks "good", we just ignore the interrupt completely.
725 *
726 * This routine assumes __cli() is in effect when called.
727 *
728 * If an unexpected interrupt happens on irq15 while we are handling irq14
729 * and if the two interfaces are "serialized" (CMD640), then it looks like
730 * we could screw up by interfering with a new request being set up for
731 * irq15.
732 *
733 * In reality, this is a non-issue. The new command is not sent unless
734 * the drive is ready to accept one, in which case we know the drive is
735 * not trying to interrupt us. And ide_set_handler() is always invoked
736 * before completing the issuance of any new drive command, so we will not
737 * be accidentally invoked as a result of any valid command completion
738 * interrupt.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 */
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100740
741static void unexpected_intr(int irq, ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742{
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100743 u8 stat = hwif->tp_ops->read_status(hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100745 if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) {
746 /* Try to not flood the console with msgs */
747 static unsigned long last_msgtime, count;
748 ++count;
Bartlomiej Zolnierkiewiczb73c7ee2008-07-23 19:55:52 +0200749
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100750 if (time_after(jiffies, last_msgtime + HZ)) {
751 last_msgtime = jiffies;
752 printk(KERN_ERR "%s: unexpected interrupt, "
753 "status=0x%02x, count=%ld\n",
754 hwif->name, stat, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 }
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100756 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757}
758
759/**
760 * ide_intr - default IDE interrupt handler
761 * @irq: interrupt number
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100762 * @dev_id: hwif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 * @regs: unused weirdness from the kernel irq layer
764 *
765 * This is the default IRQ handler for the IDE layer. You should
766 * not need to override it. If you do be aware it is subtle in
767 * places
768 *
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100769 * hwif is the interface in the group currently performing
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100770 * a command. hwif->cur_dev is the drive and hwif->handler is
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 * the IRQ handler to call. As we issue a command the handlers
772 * step through multiple states, reassigning the handler to the
773 * next step in the process. Unlike a smart SCSI controller IDE
774 * expects the main processor to sequence the various transfer
775 * stages. We also manage a poll timer to catch up with most
776 * timeout situations. There are still a few where the handlers
777 * don't ever decide to give up.
778 *
779 * The handler eventually returns ide_stopped to indicate the
780 * request completed. At this point we issue the next request
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100781 * on the port and the process begins again.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 */
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100783
David Howells7d12e782006-10-05 14:55:46 +0100784irqreturn_t ide_intr (int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785{
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100786 ide_hwif_t *hwif = (ide_hwif_t *)dev_id;
Bartlomiej Zolnierkiewicz255115fb2009-03-27 12:46:27 +0100787 struct ide_host *host = hwif->host;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100788 ide_drive_t *uninitialized_var(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 ide_handler_t *handler;
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100790 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 ide_startstop_t startstop;
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100792 irqreturn_t irq_ret = IRQ_NONE;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100793 int plug_device = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794
Bartlomiej Zolnierkiewicz255115fb2009-03-27 12:46:27 +0100795 if (host->host_flags & IDE_HFLAG_SERIALIZE) {
796 if (hwif != host->cur_port)
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100797 goto out_early;
798 }
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100799
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100800 spin_lock_irqsave(&hwif->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
Bartlomiej Zolnierkiewiczd15a6132009-03-27 12:46:21 +0100802 if (hwif->ack_intr && hwif->ack_intr(hwif) == 0)
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100803 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100805 handler = hwif->handler;
806
807 if (handler == NULL || hwif->polling) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 /*
809 * Not expecting an interrupt from this drive.
810 * That means this could be:
811 * (1) an interrupt from another PCI device
812 * sharing the same PCI INT# as us.
813 * or (2) a drive just entered sleep or standby mode,
814 * and is interrupting to let us know.
815 * or (3) a spurious interrupt of unknown origin.
816 *
817 * For PCI, we cannot tell the difference,
818 * so in that case we just ignore it and hope it goes away.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 */
Bartlomiej Zolnierkiewicz255115fb2009-03-27 12:46:27 +0100820 if ((host->irq_flags & IRQF_SHARED) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 /*
822 * Probably not a shared PCI interrupt,
823 * so we can safely try to do something about it:
824 */
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100825 unexpected_intr(irq, hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 } else {
827 /*
828 * Whack the status register, just in case
829 * we have a leftover pending IRQ.
830 */
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200831 (void)hwif->tp_ops->read_status(hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 }
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100833 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 }
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100835
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100836 drive = hwif->cur_dev;
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100837
838 if (!drive_is_ready(drive))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 /*
840 * This happens regularly when we share a PCI IRQ with
841 * another device. Unfortunately, it can also happen
842 * with some buggy drives that trigger the IRQ before
843 * their status register is up to date. Hopefully we have
844 * enough advance overhead that the latter isn't a problem.
845 */
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100846 goto out;
847
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100848 hwif->handler = NULL;
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100849 hwif->expiry = NULL;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100850 hwif->req_gen++;
851 del_timer(&hwif->timer);
852 spin_unlock(&hwif->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
Bartlomiej Zolnierkiewiczbfa7d8e2008-10-13 21:39:42 +0200854 if (hwif->port_ops && hwif->port_ops->clear_irq)
855 hwif->port_ops->clear_irq(drive);
Albert Leef0dd8712007-02-17 02:40:21 +0100856
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200857 if (drive->dev_flags & IDE_DFLAG_UNMASK)
Ingo Molnar366c7f52006-07-03 00:25:25 -0700858 local_irq_enable_in_hardirq();
Bartlomiej Zolnierkiewiczbfa7d8e2008-10-13 21:39:42 +0200859
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 /* service this interrupt, may set handler for next interrupt */
861 startstop = handler(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100863 spin_lock_irq(&hwif->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 /*
865 * Note that handler() may have set things up for another
866 * interrupt to occur soon, but it cannot happen until
867 * we exit from this routine, because it will be the
868 * same irq as is currently being serviced here, and Linux
869 * won't allow another of the same (on any CPU) until we return.
870 */
Bartlomiej Zolnierkiewicze3b29f02009-05-22 16:23:37 +0200871 if (startstop == ide_stopped && hwif->polling == 0) {
Bartlomiej Zolnierkiewicz9600dcf2009-01-06 17:20:58 +0100872 BUG_ON(hwif->handler);
873 ide_unlock_port(hwif);
874 plug_device = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 }
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100876 irq_ret = IRQ_HANDLED;
877out:
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100878 spin_unlock_irqrestore(&hwif->lock, flags);
Bartlomiej Zolnierkiewiczae86afa2009-01-06 17:20:48 +0100879out_early:
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100880 if (plug_device) {
881 ide_unlock_host(hwif->host);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100882 ide_plug_device(drive);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100883 }
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100884
Bartlomiej Zolnierkiewicz3e0e29f2008-12-29 20:27:29 +0100885 return irq_ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886}
Stanislaw Gruszka849d7132009-03-05 16:10:57 +0100887EXPORT_SYMBOL_GPL(ide_intr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +0200889void ide_pad_transfer(ide_drive_t *drive, int write, int len)
890{
891 ide_hwif_t *hwif = drive->hwif;
892 u8 buf[4] = { 0 };
893
894 while (len > 0) {
895 if (write)
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200896 hwif->tp_ops->output_data(drive, NULL, buf, min(4, len));
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +0200897 else
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200898 hwif->tp_ops->input_data(drive, NULL, buf, min(4, len));
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +0200899 len -= 4;
900 }
901}
902EXPORT_SYMBOL_GPL(ide_pad_transfer);