blob: 93b7886a2d6e34873050b28dc00f6328e141b0a8 [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))
Tejun Heo34b7d2c2009-05-07 22:24:43 +0900119 return blk_rq_bytes(rq);
Bartlomiej Zolnierkiewicz130e8862009-03-27 12:46:45 +0100120 else
Tejun Heo5b936292009-05-07 22:24:38 +0900121 return blk_rq_cur_sectors(rq) << 9;
Bartlomiej Zolnierkiewicz130e8862009-03-27 12:46:45 +0100122}
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)
Tejun Heo5b936292009-05-07 22:24:38 +0900136 nr_bytes = blk_rq_sectors(rq) << 9;
Bartlomiej Zolnierkiewicz130e8862009-03-27 12:46:45 +0100137
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
Bartlomiej Zolnierkiewicz582078e2009-05-17 19:12:18 +0200187/**
188 * do_special - issue some special commands
189 * @drive: drive the command is for
190 *
191 * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS,
192 * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive.
193 */
194
195static ide_startstop_t do_special(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100197 struct ide_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Bartlomiej Zolnierkiewicz582078e2009-05-17 19:12:18 +0200199#ifdef DEBUG
Bartlomiej Zolnierkiewiczca1b96e2009-05-17 19:12:21 +0200200 printk(KERN_DEBUG "%s: %s: 0x%02x\n", drive->name, __func__,
201 drive->special_flags);
Bartlomiej Zolnierkiewicz582078e2009-05-17 19:12:18 +0200202#endif
203 if (drive->media != ide_disk) {
Bartlomiej Zolnierkiewiczca1b96e2009-05-17 19:12:21 +0200204 drive->special_flags = 0;
Bartlomiej Zolnierkiewicz582078e2009-05-17 19:12:18 +0200205 drive->mult_req = 0;
206 return ide_stopped;
207 }
208
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100209 memset(&cmd, 0, sizeof(cmd));
Bartlomiej Zolnierkiewicz0dfb9912009-03-27 12:46:39 +0100210 cmd.protocol = ATA_PROT_NODATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
Bartlomiej Zolnierkiewiczca1b96e2009-05-17 19:12:21 +0200212 if (drive->special_flags & IDE_SFLAG_SET_GEOMETRY) {
213 drive->special_flags &= ~IDE_SFLAG_SET_GEOMETRY;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100214 ide_tf_set_specify_cmd(drive, &cmd.tf);
Bartlomiej Zolnierkiewiczca1b96e2009-05-17 19:12:21 +0200215 } else if (drive->special_flags & IDE_SFLAG_RECALIBRATE) {
216 drive->special_flags &= ~IDE_SFLAG_RECALIBRATE;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100217 ide_tf_set_restore_cmd(drive, &cmd.tf);
Bartlomiej Zolnierkiewiczca1b96e2009-05-17 19:12:21 +0200218 } else if (drive->special_flags & IDE_SFLAG_SET_MULTMODE) {
219 drive->special_flags &= ~IDE_SFLAG_SET_MULTMODE;
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100220 ide_tf_set_setmult_cmd(drive, &cmd.tf);
Bartlomiej Zolnierkiewicz5f582c82009-05-17 19:12:18 +0200221 } else
222 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200224 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
225 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
226 cmd.tf_flags = IDE_TFLAG_CUSTOM_HANDLER;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100227
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100228 do_rw_taskfile(drive, &cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230 return ide_started;
231}
232
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100233void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234{
235 ide_hwif_t *hwif = drive->hwif;
236 struct scatterlist *sg = hwif->sg_table;
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100237 struct request *rq = cmd->rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
Tejun Heo5ad960f2009-04-19 08:46:03 +0900239 cmd->sg_nents = blk_rq_map_sg(drive->queue, rq, sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241EXPORT_SYMBOL_GPL(ide_map_sg);
242
Bartlomiej Zolnierkiewiczbf717c02009-03-27 12:46:47 +0100243void ide_init_sg_cmd(struct ide_cmd *cmd, unsigned int nr_bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244{
Bartlomiej Zolnierkiewiczbf717c02009-03-27 12:46:47 +0100245 cmd->nbytes = cmd->nleft = nr_bytes;
Bartlomiej Zolnierkiewiczb6308ee2009-03-27 12:46:38 +0100246 cmd->cursg_ofs = 0;
247 cmd->cursg = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249EXPORT_SYMBOL_GPL(ide_init_sg_cmd);
250
251/**
252 * execute_drive_command - issue special drive command
Adrian Bunk338cec32005-09-10 00:26:54 -0700253 * @drive: the drive to issue the command on
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 * @rq: the request structure holding the command
255 *
256 * execute_drive_cmd() issues a special drive command, usually
257 * initiated by ioctl() from the external hdparm program. The
258 * command can be a drive command, drive task or taskfile
259 * operation. Weirdly you can call it with NULL to wait for
260 * all commands to finish. Don't do this as that is due to change
261 */
262
263static ide_startstop_t execute_drive_cmd (ide_drive_t *drive,
264 struct request *rq)
265{
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100266 struct ide_cmd *cmd = rq->special;
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100267
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100268 if (cmd) {
Bartlomiej Zolnierkiewicz0dfb9912009-03-27 12:46:39 +0100269 if (cmd->protocol == ATA_PROT_PIO) {
Tejun Heo9780e2d2009-05-07 22:24:40 +0900270 ide_init_sg_cmd(cmd, blk_rq_sectors(rq) << 9);
Bartlomiej Zolnierkiewicz229816942009-03-27 12:46:46 +0100271 ide_map_sg(drive, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273
Bartlomiej Zolnierkiewicz22aa4b32009-03-27 12:46:37 +0100274 return do_rw_taskfile(drive, cmd);
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100275 }
276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 /*
278 * NULL is actually a valid way of waiting for
279 * all current requests to be flushed from the queue.
280 */
281#ifdef DEBUG
282 printk("%s: DRIVE_CMD (null)\n", drive->name);
283#endif
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100284 rq->errors = 0;
Bartlomiej Zolnierkiewiczf974b192009-03-27 12:46:44 +0100285 ide_complete_rq(drive, 0, blk_rq_bytes(rq));
Bartlomiej Zolnierkiewicz64a57fe2008-02-06 02:57:51 +0100286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 return ide_stopped;
288}
289
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200290static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq)
291{
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200292 u8 cmd = rq->cmd[0];
293
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200294 switch (cmd) {
Bartlomiej Zolnierkiewicz1bc6daa2009-03-24 23:22:44 +0100295 case REQ_PARK_HEADS:
296 case REQ_UNPARK_HEADS:
297 return ide_do_park_unpark(drive, rq);
Elias Oltmanns92f1f8f2008-10-10 22:39:40 +0200298 case REQ_DEVSET_EXEC:
Bartlomiej Zolnierkiewicz1bc6daa2009-03-24 23:22:44 +0100299 return ide_do_devset(drive, rq);
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200300 case REQ_DRIVE_RESET:
301 return ide_do_reset(drive);
302 default:
Bartlomiej Zolnierkiewicz17137882009-03-27 12:46:42 +0100303 BUG();
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200304 }
305}
306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307/**
308 * start_request - start of I/O and command issuing for IDE
309 *
310 * start_request() initiates handling of a new I/O request. It
Bartlomiej Zolnierkiewicz3c619ff2008-10-10 22:39:22 +0200311 * accepts commands and I/O (read/write) requests.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 *
313 * FIXME: this function needs a rename
314 */
315
316static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
317{
318 ide_startstop_t startstop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Jens Axboe4aff5e22006-08-10 08:44:47 +0200320 BUG_ON(!blk_rq_started(rq));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
322#ifdef DEBUG
323 printk("%s: start_request: current=0x%08lx\n",
Bartlomiej Zolnierkiewicz898ec222009-01-06 17:20:52 +0100324 drive->hwif->name, (unsigned long) rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325#endif
326
327 /* bail early if we've exceeded max_failures */
328 if (drive->max_failures && (drive->failures > drive->max_failures)) {
Aristeu Rozanskib5e1a4e2008-01-25 22:17:04 +0100329 rq->cmd_flags |= REQ_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 goto kill_rq;
331 }
332
Jens Axboead3cadd2006-06-13 08:46:57 +0200333 if (blk_pm_request(rq))
334 ide_check_pm_state(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Sergei Shtylyovfdd88f02009-03-31 20:15:33 +0200336 drive->hwif->tp_ops->dev_select(drive);
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200337 if (ide_wait_stat(&startstop, drive, drive->ready_stat,
338 ATA_BUSY | ATA_DRQ, WAIT_READY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 printk(KERN_ERR "%s: drive not ready for command\n", drive->name);
340 return startstop;
341 }
Bartlomiej Zolnierkiewiczca1b96e2009-05-17 19:12:21 +0200342
343 if (drive->special_flags == 0) {
Bartlomiej Zolnierkiewicz7f3c8682009-01-06 17:20:53 +0100344 struct ide_driver *drv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200346 /*
347 * We reset the drive so we need to issue a SETFEATURES.
348 * Do it _after_ do_special() restored device parameters.
349 */
350 if (drive->current_speed == 0xff)
351 ide_config_drive_speed(drive, drive->desired_speed);
352
Bartlomiej Zolnierkiewicz7267c332008-01-26 20:13:13 +0100353 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 return execute_drive_cmd(drive, rq);
355 else if (blk_pm_request(rq)) {
Tejun Heo765139e2009-04-19 07:00:43 +0900356 struct request_pm_state *pm = rq->special;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357#ifdef DEBUG_PM
358 printk("%s: start_power_step(step: %d)\n",
Bartlomiej Zolnierkiewicz6b7d8fc2008-12-02 20:40:03 +0100359 drive->name, pm->pm_step);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360#endif
361 startstop = ide_start_power_step(drive, rq);
362 if (startstop == ide_stopped &&
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200363 pm->pm_step == IDE_PM_COMPLETED)
Bartlomiej Zolnierkiewicz3616b652009-03-27 12:46:29 +0100364 ide_complete_pm_rq(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 return startstop;
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200366 } else if (!rq->rq_disk && blk_special_request(rq))
367 /*
368 * TODO: Once all ULDs have been modified to
369 * check for specific op codes rather than
370 * blindly accepting any special request, the
371 * check for ->rq_disk above may be replaced
372 * by a more suitable mechanism or even
373 * dropped entirely.
374 */
375 return ide_special_rq(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
Bartlomiej Zolnierkiewicz7f3c8682009-01-06 17:20:53 +0100377 drv = *(struct ide_driver **)rq->rq_disk->private_data;
Bartlomiej Zolnierkiewicz3c619ff2008-10-10 22:39:22 +0200378
Tejun Heo9780e2d2009-05-07 22:24:40 +0900379 return drv->do_request(drive, rq, blk_rq_pos(rq));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 }
381 return do_special(drive);
382kill_rq:
383 ide_kill_rq(drive, rq);
384 return ide_stopped;
385}
386
387/**
388 * ide_stall_queue - pause an IDE device
389 * @drive: drive to stall
390 * @timeout: time to stall for (jiffies)
391 *
392 * ide_stall_queue() can be used by a drive to give excess bandwidth back
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100393 * to the port by sleeping for timeout jiffies.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 */
395
396void ide_stall_queue (ide_drive_t *drive, unsigned long timeout)
397{
398 if (timeout > WAIT_WORSTCASE)
399 timeout = WAIT_WORSTCASE;
400 drive->sleep = timeout + jiffies;
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200401 drive->dev_flags |= IDE_DFLAG_SLEEPING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403EXPORT_SYMBOL(ide_stall_queue);
404
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100405static inline int ide_lock_port(ide_hwif_t *hwif)
406{
407 if (hwif->busy)
408 return 1;
409
410 hwif->busy = 1;
411
412 return 0;
413}
414
415static inline void ide_unlock_port(ide_hwif_t *hwif)
416{
417 hwif->busy = 0;
418}
419
420static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif)
421{
422 int rc = 0;
423
424 if (host->host_flags & IDE_HFLAG_SERIALIZE) {
425 rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy);
426 if (rc == 0) {
Bartlomiej Zolnierkiewicze354c1d2009-03-27 12:46:22 +0100427 if (host->get_lock)
428 host->get_lock(ide_intr, hwif);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100429 }
430 }
431 return rc;
432}
433
434static inline void ide_unlock_host(struct ide_host *host)
435{
436 if (host->host_flags & IDE_HFLAG_SERIALIZE) {
Bartlomiej Zolnierkiewicze354c1d2009-03-27 12:46:22 +0100437 if (host->release_lock)
438 host->release_lock();
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100439 clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy);
440 }
441}
442
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443/*
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100444 * Issue a new request to a device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 */
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100446void do_ide_request(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447{
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100448 ide_drive_t *drive = q->queuedata;
449 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100450 struct ide_host *host = hwif->host;
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100451 struct request *rq = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 ide_startstop_t startstop;
453
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100454 /*
455 * drive is doing pre-flush, ordered write, post-flush sequence. even
456 * though that is 3 requests, it must be seen as a single transaction.
457 * we must not preempt this drive until that is complete
458 */
459 if (blk_queue_flushing(q))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 /*
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100461 * small race where queue could get replugged during
462 * the 3-request flush cycle, just yank the plug since
463 * we want it to finish asap
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 */
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100465 blk_remove_plug(q);
466
467 spin_unlock_irq(q->queue_lock);
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100468
Tejun Heo02e7cf82009-04-19 07:00:42 +0900469 /* HLD do_request() callback might sleep, make sure it's okay */
470 might_sleep();
471
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100472 if (ide_lock_host(host, hwif))
473 goto plug_device_2;
474
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100475 spin_lock_irq(&hwif->lock);
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100476
Bartlomiej Zolnierkiewicz5b31f852009-01-06 17:20:49 +0100477 if (!ide_lock_port(hwif)) {
Bartlomiej Zolnierkiewicz42cf2612009-01-06 17:20:47 +0100478 ide_hwif_t *prev_port;
Bartlomiej Zolnierkiewicz201bffa2009-01-02 16:12:50 +0100479repeat:
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100480 prev_port = hwif->host->cur_port;
Bartlomiej Zolnierkiewicza1317f72009-06-23 23:52:17 -0700481
482 if (drive->dev_flags & IDE_DFLAG_BLOCKED)
483 rq = hwif->rq;
484 else
485 WARN_ON_ONCE(hwif->rq);
486
Elias Oltmanns90109412009-03-31 20:14:56 +0200487 if (drive->dev_flags & IDE_DFLAG_SLEEPING &&
488 time_after(drive->sleep, jiffies)) {
489 ide_unlock_port(hwif);
490 goto plug_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 }
Bartlomiej Zolnierkiewicz295f0002009-01-02 16:12:48 +0100492
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100493 if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) &&
494 hwif != prev_port) {
Bartlomiej Zolnierkiewicz734affd2009-06-07 15:37:10 +0200495 ide_drive_t *cur_dev =
496 prev_port ? prev_port->cur_dev : NULL;
497
Bartlomiej Zolnierkiewicz7299a392008-01-25 22:17:14 +0100498 /*
Bartlomiej Zolnierkiewicz42cf2612009-01-06 17:20:47 +0100499 * set nIEN for previous port, drives in the
Bartlomiej Zolnierkiewicz734affd2009-06-07 15:37:10 +0200500 * quirk list may not like intr setups/cleanups
Bartlomiej Zolnierkiewicz7299a392008-01-25 22:17:14 +0100501 */
Bartlomiej Zolnierkiewicz734affd2009-06-07 15:37:10 +0200502 if (cur_dev &&
503 (cur_dev->dev_flags & IDE_DFLAG_NIEN_QUIRK) == 0)
Sergei Shtylyovecf3a312009-03-31 20:15:30 +0200504 prev_port->tp_ops->write_devctl(prev_port,
505 ATA_NIEN |
506 ATA_DEVCTL_OBS);
Bartlomiej Zolnierkiewiczbd53cbc2009-01-06 17:20:48 +0100507
508 hwif->host->cur_port = hwif;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 }
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100510 hwif->cur_dev = drive;
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200511 drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
Bartlomiej Zolnierkiewicza1317f72009-06-23 23:52:17 -0700513 if (rq == NULL) {
514 spin_unlock_irq(&hwif->lock);
515 spin_lock_irq(q->queue_lock);
516 /*
517 * we know that the queue isn't empty, but this can
518 * happen if ->prep_rq_fn() decides to kill a request
519 */
Tejun Heo9934c8c2009-05-08 11:54:16 +0900520 rq = blk_fetch_request(drive->queue);
Bartlomiej Zolnierkiewicza1317f72009-06-23 23:52:17 -0700521 spin_unlock_irq(q->queue_lock);
522 spin_lock_irq(&hwif->lock);
Tejun Heo8f6205c2009-05-08 11:53:59 +0900523
Bartlomiej Zolnierkiewicza1317f72009-06-23 23:52:17 -0700524 if (rq == NULL) {
525 ide_unlock_port(hwif);
526 goto out;
527 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 }
529
530 /*
531 * Sanity: don't accept a request that isn't a PM request
Bartlomiej Zolnierkiewicza1317f72009-06-23 23:52:17 -0700532 * if we are currently power managed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 */
Bartlomiej Zolnierkiewicza1317f72009-06-23 23:52:17 -0700534 BUG_ON((drive->dev_flags & IDE_DFLAG_BLOCKED) &&
535 blk_pm_request(rq) == 0);
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);