Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #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 Slaby | 1977f03 | 2007-10-18 23:40:25 -0700 | [diff] [blame] | 50 | #include <linux/bitops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | #include <asm/byteorder.h> |
| 53 | #include <asm/irq.h> |
| 54 | #include <asm/uaccess.h> |
| 55 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Bartlomiej Zolnierkiewicz | 37245aa | 2009-03-27 12:46:43 +0100 | [diff] [blame] | 57 | int ide_end_rq(ide_drive_t *drive, struct request *rq, int error, |
Bartlomiej Zolnierkiewicz | 1caf236 | 2009-03-27 12:46:42 +0100 | [diff] [blame] | 58 | unsigned int nr_bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | /* |
| 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 Zolnierkiewicz | c392204 | 2008-10-13 21:39:37 +0200 | [diff] [blame] | 64 | if ((drive->dev_flags & IDE_DFLAG_DMA_PIO_RETRY) && |
| 65 | drive->retry_pio <= 3) { |
| 66 | drive->dev_flags &= ~IDE_DFLAG_DMA_PIO_RETRY; |
Bartlomiej Zolnierkiewicz | 4a546e0 | 2008-01-26 20:13:01 +0100 | [diff] [blame] | 67 | ide_dma_on(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | } |
| 69 | |
Bartlomiej Zolnierkiewicz | 1caf236 | 2009-03-27 12:46:42 +0100 | [diff] [blame] | 70 | return blk_end_request(rq, error, nr_bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | } |
Bartlomiej Zolnierkiewicz | 1caf236 | 2009-03-27 12:46:42 +0100 | [diff] [blame] | 72 | EXPORT_SYMBOL_GPL(ide_end_rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 74 | void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err) |
Bartlomiej Zolnierkiewicz | e120237 | 2009-03-27 12:46:29 +0100 | [diff] [blame] | 75 | { |
Sergei Shtylyov | 35218d1 | 2009-03-31 20:15:31 +0200 | [diff] [blame] | 76 | const struct ide_tp_ops *tp_ops = drive->hwif->tp_ops; |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 77 | struct ide_taskfile *tf = &cmd->tf; |
| 78 | struct request *rq = cmd->rq; |
Bartlomiej Zolnierkiewicz | e7fedc3 | 2009-03-27 12:46:41 +0100 | [diff] [blame] | 79 | u8 tf_cmd = tf->command; |
Bartlomiej Zolnierkiewicz | e120237 | 2009-03-27 12:46:29 +0100 | [diff] [blame] | 80 | |
| 81 | tf->error = err; |
| 82 | tf->status = stat; |
| 83 | |
Sergei Shtylyov | 35218d1 | 2009-03-31 20:15:31 +0200 | [diff] [blame] | 84 | if (cmd->ftf_flags & IDE_FTFLAG_IN_DATA) { |
| 85 | u8 data[2]; |
| 86 | |
| 87 | tp_ops->input_data(drive, cmd, data, 2); |
| 88 | |
| 89 | tf->data = data[0]; |
| 90 | tf->hob_data = data[1]; |
| 91 | } |
| 92 | |
| 93 | tp_ops->tf_read(drive, cmd); |
Bartlomiej Zolnierkiewicz | e120237 | 2009-03-27 12:46:29 +0100 | [diff] [blame] | 94 | |
Bartlomiej Zolnierkiewicz | e7fedc3 | 2009-03-27 12:46:41 +0100 | [diff] [blame] | 95 | if ((cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) && |
| 96 | tf_cmd == ATA_CMD_IDLEIMMEDIATE) { |
| 97 | if (tf->lbal != 0xc4) { |
| 98 | printk(KERN_ERR "%s: head unload failed!\n", |
| 99 | drive->name); |
| 100 | ide_tf_dump(drive->name, tf); |
| 101 | } else |
| 102 | drive->dev_flags |= IDE_DFLAG_PARKED; |
| 103 | } |
| 104 | |
Bartlomiej Zolnierkiewicz | a09485d | 2009-03-27 12:46:31 +0100 | [diff] [blame] | 105 | if (rq && rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 106 | memcpy(rq->special, cmd, sizeof(*cmd)); |
Bartlomiej Zolnierkiewicz | a09485d | 2009-03-27 12:46:31 +0100 | [diff] [blame] | 107 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 108 | if (cmd->tf_flags & IDE_TFLAG_DYN) |
| 109 | kfree(cmd); |
Bartlomiej Zolnierkiewicz | e120237 | 2009-03-27 12:46:29 +0100 | [diff] [blame] | 110 | } |
| 111 | |
Bartlomiej Zolnierkiewicz | 130e886 | 2009-03-27 12:46:45 +0100 | [diff] [blame] | 112 | /* obsolete, blk_rq_bytes() should be used instead */ |
| 113 | unsigned int ide_rq_bytes(struct request *rq) |
| 114 | { |
| 115 | if (blk_pc_request(rq)) |
| 116 | return rq->data_len; |
| 117 | else |
| 118 | return rq->hard_cur_sectors << 9; |
| 119 | } |
| 120 | EXPORT_SYMBOL_GPL(ide_rq_bytes); |
| 121 | |
Bartlomiej Zolnierkiewicz | f974b19 | 2009-03-27 12:46:44 +0100 | [diff] [blame] | 122 | int ide_complete_rq(ide_drive_t *drive, int error, unsigned int nr_bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 124 | ide_hwif_t *hwif = drive->hwif; |
| 125 | struct request *rq = hwif->rq; |
Bartlomiej Zolnierkiewicz | a9587fd | 2009-03-27 12:46:44 +0100 | [diff] [blame] | 126 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Bartlomiej Zolnierkiewicz | 130e886 | 2009-03-27 12:46:45 +0100 | [diff] [blame] | 128 | /* |
| 129 | * if failfast is set on a request, override number of sectors |
| 130 | * and complete the whole request right now |
| 131 | */ |
| 132 | if (blk_noretry_request(rq) && error <= 0) |
| 133 | nr_bytes = rq->hard_nr_sectors << 9; |
| 134 | |
Bartlomiej Zolnierkiewicz | ba7d479 | 2009-03-27 12:46:44 +0100 | [diff] [blame] | 135 | rc = ide_end_rq(drive, rq, error, nr_bytes); |
Bartlomiej Zolnierkiewicz | a9587fd | 2009-03-27 12:46:44 +0100 | [diff] [blame] | 136 | if (rc == 0) |
| 137 | hwif->rq = NULL; |
Bartlomiej Zolnierkiewicz | 1d0bf58 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 138 | |
Bartlomiej Zolnierkiewicz | a9587fd | 2009-03-27 12:46:44 +0100 | [diff] [blame] | 139 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
Bartlomiej Zolnierkiewicz | a09485d | 2009-03-27 12:46:31 +0100 | [diff] [blame] | 141 | EXPORT_SYMBOL(ide_complete_rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
Bartlomiej Zolnierkiewicz | 327fa1c | 2009-03-24 23:22:47 +0100 | [diff] [blame] | 143 | void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | { |
Bartlomiej Zolnierkiewicz | 3ee3830 | 2009-03-27 12:46:36 +0100 | [diff] [blame] | 145 | u8 drv_req = blk_special_request(rq) && rq->rq_disk; |
| 146 | u8 media = drive->media; |
| 147 | |
Bartlomiej Zolnierkiewicz | c152cc1 | 2009-03-27 12:46:34 +0100 | [diff] [blame] | 148 | drive->failed_pc = NULL; |
| 149 | |
Bartlomiej Zolnierkiewicz | 6902a53 | 2009-03-27 12:46:43 +0100 | [diff] [blame] | 150 | if ((media == ide_floppy || media == ide_tape) && drv_req) { |
| 151 | rq->errors = 0; |
Bartlomiej Zolnierkiewicz | f974b19 | 2009-03-27 12:46:44 +0100 | [diff] [blame] | 152 | ide_complete_rq(drive, 0, blk_rq_bytes(rq)); |
Bartlomiej Zolnierkiewicz | 6902a53 | 2009-03-27 12:46:43 +0100 | [diff] [blame] | 153 | } else { |
| 154 | if (media == ide_tape) |
| 155 | rq->errors = IDE_DRV_ERROR_GENERAL; |
Bartlomiej Zolnierkiewicz | 89f78b32 | 2009-03-27 12:46:43 +0100 | [diff] [blame] | 156 | else if (blk_fs_request(rq) == 0 && rq->errors == 0) |
| 157 | rq->errors = -EIO; |
Bartlomiej Zolnierkiewicz | 130e886 | 2009-03-27 12:46:45 +0100 | [diff] [blame] | 158 | ide_complete_rq(drive, -EIO, ide_rq_bytes(rq)); |
Bartlomiej Zolnierkiewicz | 6902a53 | 2009-03-27 12:46:43 +0100 | [diff] [blame] | 159 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | } |
| 161 | |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 162 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | { |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 164 | tf->nsect = drive->sect; |
| 165 | tf->lbal = drive->sect; |
| 166 | tf->lbam = drive->cyl; |
| 167 | tf->lbah = drive->cyl >> 8; |
Bartlomiej Zolnierkiewicz | 7f612f2 | 2008-10-13 21:39:40 +0200 | [diff] [blame] | 168 | tf->device = (drive->head - 1) | drive->select; |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 169 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | } |
| 171 | |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 172 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | { |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 174 | tf->nsect = drive->sect; |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 175 | tf->command = ATA_CMD_RESTORE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 178 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | { |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 180 | tf->nsect = drive->mult_req; |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 181 | tf->command = ATA_CMD_SET_MULTI; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) |
| 185 | { |
| 186 | special_t *s = &drive->special; |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 187 | struct ide_cmd cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 189 | memset(&cmd, 0, sizeof(cmd)); |
Bartlomiej Zolnierkiewicz | 0dfb991 | 2009-03-27 12:46:39 +0100 | [diff] [blame] | 190 | cmd.protocol = ATA_PROT_NODATA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
| 192 | if (s->b.set_geometry) { |
| 193 | s->b.set_geometry = 0; |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 194 | ide_tf_set_specify_cmd(drive, &cmd.tf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } else if (s->b.recalibrate) { |
| 196 | s->b.recalibrate = 0; |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 197 | ide_tf_set_restore_cmd(drive, &cmd.tf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | } else if (s->b.set_multmode) { |
| 199 | s->b.set_multmode = 0; |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 200 | ide_tf_set_setmult_cmd(drive, &cmd.tf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | } else if (s->all) { |
| 202 | int special = s->all; |
| 203 | s->all = 0; |
| 204 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); |
| 205 | return ide_stopped; |
| 206 | } |
| 207 | |
Sergei Shtylyov | 60f8501 | 2009-04-08 14:13:01 +0200 | [diff] [blame^] | 208 | cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; |
| 209 | cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; |
| 210 | cmd.tf_flags = IDE_TFLAG_CUSTOM_HANDLER; |
Bartlomiej Zolnierkiewicz | 74095a9 | 2008-01-25 22:17:07 +0100 | [diff] [blame] | 211 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 212 | do_rw_taskfile(drive, &cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
| 214 | return ide_started; |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * do_special - issue some special commands |
| 219 | * @drive: drive the command is for |
| 220 | * |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 221 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
| 222 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. |
| 223 | * |
| 224 | * It used to do much more, but has been scaled back. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | */ |
| 226 | |
| 227 | static ide_startstop_t do_special (ide_drive_t *drive) |
| 228 | { |
| 229 | special_t *s = &drive->special; |
| 230 | |
| 231 | #ifdef DEBUG |
| 232 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); |
| 233 | #endif |
Bartlomiej Zolnierkiewicz | 6982daf | 2008-10-13 21:39:40 +0200 | [diff] [blame] | 234 | if (drive->media == ide_disk) |
| 235 | return ide_disk_special(drive); |
Bartlomiej Zolnierkiewicz | 26bcb87 | 2007-10-11 23:54:00 +0200 | [diff] [blame] | 236 | |
Bartlomiej Zolnierkiewicz | 6982daf | 2008-10-13 21:39:40 +0200 | [diff] [blame] | 237 | s->all = 0; |
| 238 | drive->mult_req = 0; |
| 239 | return ide_stopped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | } |
| 241 | |
Bartlomiej Zolnierkiewicz | 22981694 | 2009-03-27 12:46:46 +0100 | [diff] [blame] | 242 | void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | { |
| 244 | ide_hwif_t *hwif = drive->hwif; |
| 245 | struct scatterlist *sg = hwif->sg_table; |
Bartlomiej Zolnierkiewicz | 22981694 | 2009-03-27 12:46:46 +0100 | [diff] [blame] | 246 | struct request *rq = cmd->rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
Borislav Petkov | 9e772d0 | 2009-02-02 20:12:21 +0100 | [diff] [blame] | 248 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
Bartlomiej Zolnierkiewicz | b6308ee | 2009-03-27 12:46:38 +0100 | [diff] [blame] | 250 | cmd->sg_nents = 1; |
Borislav Petkov | 9e772d0 | 2009-02-02 20:12:21 +0100 | [diff] [blame] | 251 | } else if (!rq->bio) { |
| 252 | sg_init_one(sg, rq->data, rq->data_len); |
Bartlomiej Zolnierkiewicz | b6308ee | 2009-03-27 12:46:38 +0100 | [diff] [blame] | 253 | cmd->sg_nents = 1; |
| 254 | } else |
| 255 | cmd->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | EXPORT_SYMBOL_GPL(ide_map_sg); |
| 258 | |
Bartlomiej Zolnierkiewicz | bf717c0 | 2009-03-27 12:46:47 +0100 | [diff] [blame] | 259 | void ide_init_sg_cmd(struct ide_cmd *cmd, unsigned int nr_bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | { |
Bartlomiej Zolnierkiewicz | bf717c0 | 2009-03-27 12:46:47 +0100 | [diff] [blame] | 261 | cmd->nbytes = cmd->nleft = nr_bytes; |
Bartlomiej Zolnierkiewicz | b6308ee | 2009-03-27 12:46:38 +0100 | [diff] [blame] | 262 | cmd->cursg_ofs = 0; |
| 263 | cmd->cursg = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); |
| 266 | |
| 267 | /** |
| 268 | * execute_drive_command - issue special drive command |
Adrian Bunk | 338cec3 | 2005-09-10 00:26:54 -0700 | [diff] [blame] | 269 | * @drive: the drive to issue the command on |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | * @rq: the request structure holding the command |
| 271 | * |
| 272 | * execute_drive_cmd() issues a special drive command, usually |
| 273 | * initiated by ioctl() from the external hdparm program. The |
| 274 | * command can be a drive command, drive task or taskfile |
| 275 | * operation. Weirdly you can call it with NULL to wait for |
| 276 | * all commands to finish. Don't do this as that is due to change |
| 277 | */ |
| 278 | |
| 279 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, |
| 280 | struct request *rq) |
| 281 | { |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 282 | struct ide_cmd *cmd = rq->special; |
Bartlomiej Zolnierkiewicz | 21d535c | 2008-01-25 22:17:09 +0100 | [diff] [blame] | 283 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 284 | if (cmd) { |
Bartlomiej Zolnierkiewicz | 0dfb991 | 2009-03-27 12:46:39 +0100 | [diff] [blame] | 285 | if (cmd->protocol == ATA_PROT_PIO) { |
Bartlomiej Zolnierkiewicz | bf717c0 | 2009-03-27 12:46:47 +0100 | [diff] [blame] | 286 | ide_init_sg_cmd(cmd, rq->nr_sectors << 9); |
Bartlomiej Zolnierkiewicz | 22981694 | 2009-03-27 12:46:46 +0100 | [diff] [blame] | 287 | ide_map_sg(drive, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | } |
| 289 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 290 | return do_rw_taskfile(drive, cmd); |
Bartlomiej Zolnierkiewicz | 21d535c | 2008-01-25 22:17:09 +0100 | [diff] [blame] | 291 | } |
| 292 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | /* |
| 294 | * NULL is actually a valid way of waiting for |
| 295 | * all current requests to be flushed from the queue. |
| 296 | */ |
| 297 | #ifdef DEBUG |
| 298 | printk("%s: DRIVE_CMD (null)\n", drive->name); |
| 299 | #endif |
Bartlomiej Zolnierkiewicz | 6902a53 | 2009-03-27 12:46:43 +0100 | [diff] [blame] | 300 | rq->errors = 0; |
Bartlomiej Zolnierkiewicz | f974b19 | 2009-03-27 12:46:44 +0100 | [diff] [blame] | 301 | ide_complete_rq(drive, 0, blk_rq_bytes(rq)); |
Bartlomiej Zolnierkiewicz | 64a57fe | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | return ide_stopped; |
| 304 | } |
| 305 | |
Elias Oltmanns | 79e36a9 | 2008-07-16 20:33:48 +0200 | [diff] [blame] | 306 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
| 307 | { |
Elias Oltmanns | 4abdc6e | 2008-10-13 21:39:50 +0200 | [diff] [blame] | 308 | u8 cmd = rq->cmd[0]; |
| 309 | |
Elias Oltmanns | 4abdc6e | 2008-10-13 21:39:50 +0200 | [diff] [blame] | 310 | switch (cmd) { |
Bartlomiej Zolnierkiewicz | 1bc6daa | 2009-03-24 23:22:44 +0100 | [diff] [blame] | 311 | case REQ_PARK_HEADS: |
| 312 | case REQ_UNPARK_HEADS: |
| 313 | return ide_do_park_unpark(drive, rq); |
Elias Oltmanns | 92f1f8f | 2008-10-10 22:39:40 +0200 | [diff] [blame] | 314 | case REQ_DEVSET_EXEC: |
Bartlomiej Zolnierkiewicz | 1bc6daa | 2009-03-24 23:22:44 +0100 | [diff] [blame] | 315 | return ide_do_devset(drive, rq); |
Elias Oltmanns | 79e36a9 | 2008-07-16 20:33:48 +0200 | [diff] [blame] | 316 | case REQ_DRIVE_RESET: |
| 317 | return ide_do_reset(drive); |
| 318 | default: |
Bartlomiej Zolnierkiewicz | 1713788 | 2009-03-27 12:46:42 +0100 | [diff] [blame] | 319 | BUG(); |
Elias Oltmanns | 79e36a9 | 2008-07-16 20:33:48 +0200 | [diff] [blame] | 320 | } |
| 321 | } |
| 322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | /** |
| 324 | * start_request - start of I/O and command issuing for IDE |
| 325 | * |
| 326 | * start_request() initiates handling of a new I/O request. It |
Bartlomiej Zolnierkiewicz | 3c619ff | 2008-10-10 22:39:22 +0200 | [diff] [blame] | 327 | * accepts commands and I/O (read/write) requests. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | * |
| 329 | * FIXME: this function needs a rename |
| 330 | */ |
| 331 | |
| 332 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) |
| 333 | { |
| 334 | ide_startstop_t startstop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 336 | BUG_ON(!blk_rq_started(rq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
| 338 | #ifdef DEBUG |
| 339 | printk("%s: start_request: current=0x%08lx\n", |
Bartlomiej Zolnierkiewicz | 898ec22 | 2009-01-06 17:20:52 +0100 | [diff] [blame] | 340 | drive->hwif->name, (unsigned long) rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | #endif |
| 342 | |
| 343 | /* bail early if we've exceeded max_failures */ |
| 344 | if (drive->max_failures && (drive->failures > drive->max_failures)) { |
Aristeu Rozanski | b5e1a4e | 2008-01-25 22:17:04 +0100 | [diff] [blame] | 345 | rq->cmd_flags |= REQ_FAILED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | goto kill_rq; |
| 347 | } |
| 348 | |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 349 | if (blk_pm_request(rq)) |
| 350 | ide_check_pm_state(drive, rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
Sergei Shtylyov | fdd88f0 | 2009-03-31 20:15:33 +0200 | [diff] [blame] | 352 | drive->hwif->tp_ops->dev_select(drive); |
Bartlomiej Zolnierkiewicz | 3a7d248 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 353 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
| 354 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
| 356 | return startstop; |
| 357 | } |
| 358 | if (!drive->special.all) { |
Bartlomiej Zolnierkiewicz | 7f3c868 | 2009-01-06 17:20:53 +0100 | [diff] [blame] | 359 | struct ide_driver *drv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
Suleiman Souhlal | 513daad | 2007-03-26 23:03:20 +0200 | [diff] [blame] | 361 | /* |
| 362 | * We reset the drive so we need to issue a SETFEATURES. |
| 363 | * Do it _after_ do_special() restored device parameters. |
| 364 | */ |
| 365 | if (drive->current_speed == 0xff) |
| 366 | ide_config_drive_speed(drive, drive->desired_speed); |
| 367 | |
Bartlomiej Zolnierkiewicz | 7267c33 | 2008-01-26 20:13:13 +0100 | [diff] [blame] | 368 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | return execute_drive_cmd(drive, rq); |
| 370 | else if (blk_pm_request(rq)) { |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 371 | struct request_pm_state *pm = rq->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | #ifdef DEBUG_PM |
| 373 | printk("%s: start_power_step(step: %d)\n", |
Bartlomiej Zolnierkiewicz | 6b7d8fc | 2008-12-02 20:40:03 +0100 | [diff] [blame] | 374 | drive->name, pm->pm_step); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | #endif |
| 376 | startstop = ide_start_power_step(drive, rq); |
| 377 | if (startstop == ide_stopped && |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 378 | pm->pm_step == IDE_PM_COMPLETED) |
Bartlomiej Zolnierkiewicz | 3616b65 | 2009-03-27 12:46:29 +0100 | [diff] [blame] | 379 | ide_complete_pm_rq(drive, rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | return startstop; |
Elias Oltmanns | 79e36a9 | 2008-07-16 20:33:48 +0200 | [diff] [blame] | 381 | } else if (!rq->rq_disk && blk_special_request(rq)) |
| 382 | /* |
| 383 | * TODO: Once all ULDs have been modified to |
| 384 | * check for specific op codes rather than |
| 385 | * blindly accepting any special request, the |
| 386 | * check for ->rq_disk above may be replaced |
| 387 | * by a more suitable mechanism or even |
| 388 | * dropped entirely. |
| 389 | */ |
| 390 | return ide_special_rq(drive, rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
Bartlomiej Zolnierkiewicz | 7f3c868 | 2009-01-06 17:20:53 +0100 | [diff] [blame] | 392 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
Bartlomiej Zolnierkiewicz | 3c619ff | 2008-10-10 22:39:22 +0200 | [diff] [blame] | 393 | |
| 394 | return drv->do_request(drive, rq, rq->sector); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | } |
| 396 | return do_special(drive); |
| 397 | kill_rq: |
| 398 | ide_kill_rq(drive, rq); |
| 399 | return ide_stopped; |
| 400 | } |
| 401 | |
| 402 | /** |
| 403 | * ide_stall_queue - pause an IDE device |
| 404 | * @drive: drive to stall |
| 405 | * @timeout: time to stall for (jiffies) |
| 406 | * |
| 407 | * ide_stall_queue() can be used by a drive to give excess bandwidth back |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 408 | * to the port by sleeping for timeout jiffies. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | */ |
| 410 | |
| 411 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) |
| 412 | { |
| 413 | if (timeout > WAIT_WORSTCASE) |
| 414 | timeout = WAIT_WORSTCASE; |
| 415 | drive->sleep = timeout + jiffies; |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 416 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | EXPORT_SYMBOL(ide_stall_queue); |
| 419 | |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 420 | static inline int ide_lock_port(ide_hwif_t *hwif) |
| 421 | { |
| 422 | if (hwif->busy) |
| 423 | return 1; |
| 424 | |
| 425 | hwif->busy = 1; |
| 426 | |
| 427 | return 0; |
| 428 | } |
| 429 | |
| 430 | static inline void ide_unlock_port(ide_hwif_t *hwif) |
| 431 | { |
| 432 | hwif->busy = 0; |
| 433 | } |
| 434 | |
| 435 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) |
| 436 | { |
| 437 | int rc = 0; |
| 438 | |
| 439 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
| 440 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); |
| 441 | if (rc == 0) { |
Bartlomiej Zolnierkiewicz | e354c1d | 2009-03-27 12:46:22 +0100 | [diff] [blame] | 442 | if (host->get_lock) |
| 443 | host->get_lock(ide_intr, hwif); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 444 | } |
| 445 | } |
| 446 | return rc; |
| 447 | } |
| 448 | |
| 449 | static inline void ide_unlock_host(struct ide_host *host) |
| 450 | { |
| 451 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
Bartlomiej Zolnierkiewicz | e354c1d | 2009-03-27 12:46:22 +0100 | [diff] [blame] | 452 | if (host->release_lock) |
| 453 | host->release_lock(); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 454 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); |
| 455 | } |
| 456 | } |
| 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | /* |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 459 | * Issue a new request to a device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | */ |
Bartlomiej Zolnierkiewicz | 295f000 | 2009-01-02 16:12:48 +0100 | [diff] [blame] | 461 | void do_ide_request(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | { |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 463 | ide_drive_t *drive = q->queuedata; |
| 464 | ide_hwif_t *hwif = drive->hwif; |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 465 | struct ide_host *host = hwif->host; |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 466 | struct request *rq = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | ide_startstop_t startstop; |
| 468 | |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 469 | /* |
| 470 | * drive is doing pre-flush, ordered write, post-flush sequence. even |
| 471 | * though that is 3 requests, it must be seen as a single transaction. |
| 472 | * we must not preempt this drive until that is complete |
| 473 | */ |
| 474 | if (blk_queue_flushing(q)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | /* |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 476 | * small race where queue could get replugged during |
| 477 | * the 3-request flush cycle, just yank the plug since |
| 478 | * we want it to finish asap |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | */ |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 480 | blk_remove_plug(q); |
| 481 | |
| 482 | spin_unlock_irq(q->queue_lock); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 483 | |
| 484 | if (ide_lock_host(host, hwif)) |
| 485 | goto plug_device_2; |
| 486 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 487 | spin_lock_irq(&hwif->lock); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 488 | |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 489 | if (!ide_lock_port(hwif)) { |
Bartlomiej Zolnierkiewicz | 42cf261 | 2009-01-06 17:20:47 +0100 | [diff] [blame] | 490 | ide_hwif_t *prev_port; |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 491 | repeat: |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 492 | prev_port = hwif->host->cur_port; |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 493 | hwif->rq = NULL; |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 494 | |
Elias Oltmanns | 9010941 | 2009-03-31 20:14:56 +0200 | [diff] [blame] | 495 | if (drive->dev_flags & IDE_DFLAG_SLEEPING && |
| 496 | time_after(drive->sleep, jiffies)) { |
| 497 | ide_unlock_port(hwif); |
| 498 | goto plug_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } |
Bartlomiej Zolnierkiewicz | 295f000 | 2009-01-02 16:12:48 +0100 | [diff] [blame] | 500 | |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 501 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
| 502 | hwif != prev_port) { |
Bartlomiej Zolnierkiewicz | 7299a39 | 2008-01-25 22:17:14 +0100 | [diff] [blame] | 503 | /* |
Bartlomiej Zolnierkiewicz | 42cf261 | 2009-01-06 17:20:47 +0100 | [diff] [blame] | 504 | * set nIEN for previous port, drives in the |
Bartlomiej Zolnierkiewicz | 7299a39 | 2008-01-25 22:17:14 +0100 | [diff] [blame] | 505 | * quirk_list may not like intr setups/cleanups |
| 506 | */ |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 507 | if (prev_port && prev_port->cur_dev->quirk_list == 0) |
Sergei Shtylyov | ecf3a31 | 2009-03-31 20:15:30 +0200 | [diff] [blame] | 508 | prev_port->tp_ops->write_devctl(prev_port, |
| 509 | ATA_NIEN | |
| 510 | ATA_DEVCTL_OBS); |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 511 | |
| 512 | hwif->host->cur_port = hwif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | } |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 514 | hwif->cur_dev = drive; |
Elias Oltmanns | 4abdc6e | 2008-10-13 21:39:50 +0200 | [diff] [blame] | 515 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 517 | spin_unlock_irq(&hwif->lock); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 518 | spin_lock_irq(q->queue_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | /* |
| 520 | * we know that the queue isn't empty, but this can happen |
| 521 | * if the q->prep_rq_fn() decides to kill a request |
| 522 | */ |
| 523 | rq = elv_next_request(drive->queue); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 524 | spin_unlock_irq(q->queue_lock); |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 525 | spin_lock_irq(&hwif->lock); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 526 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | if (!rq) { |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 528 | ide_unlock_port(hwif); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 529 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | } |
| 531 | |
| 532 | /* |
| 533 | * Sanity: don't accept a request that isn't a PM request |
| 534 | * if we are currently power managed. This is very important as |
| 535 | * blk_stop_queue() doesn't prevent the elv_next_request() |
| 536 | * above to return us whatever is in the queue. Since we call |
| 537 | * ide_do_request() ourselves, we end up taking requests while |
| 538 | * the queue is blocked... |
| 539 | * |
| 540 | * We let requests forced at head of queue with ide-preempt |
| 541 | * though. I hope that doesn't happen too much, hopefully not |
| 542 | * unless the subdriver triggers such a thing in its own PM |
| 543 | * state machine. |
| 544 | */ |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 545 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
| 546 | blk_pm_request(rq) == 0 && |
| 547 | (rq->cmd_flags & REQ_PREEMPT) == 0) { |
Bartlomiej Zolnierkiewicz | 631de37 | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 548 | /* there should be no pending command at this point */ |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 549 | ide_unlock_port(hwif); |
Bartlomiej Zolnierkiewicz | 295f000 | 2009-01-02 16:12:48 +0100 | [diff] [blame] | 550 | goto plug_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
| 552 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 553 | hwif->rq = rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 555 | spin_unlock_irq(&hwif->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | startstop = start_request(drive, rq); |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 557 | spin_lock_irq(&hwif->lock); |
Bartlomiej Zolnierkiewicz | 295f000 | 2009-01-02 16:12:48 +0100 | [diff] [blame] | 558 | |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 559 | if (startstop == ide_stopped) |
| 560 | goto repeat; |
| 561 | } else |
| 562 | goto plug_device; |
| 563 | out: |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 564 | spin_unlock_irq(&hwif->lock); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 565 | if (rq == NULL) |
| 566 | ide_unlock_host(host); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 567 | spin_lock_irq(q->queue_lock); |
Bartlomiej Zolnierkiewicz | 295f000 | 2009-01-02 16:12:48 +0100 | [diff] [blame] | 568 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
Bartlomiej Zolnierkiewicz | 295f000 | 2009-01-02 16:12:48 +0100 | [diff] [blame] | 570 | plug_device: |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 571 | spin_unlock_irq(&hwif->lock); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 572 | ide_unlock_host(host); |
| 573 | plug_device_2: |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 574 | spin_lock_irq(q->queue_lock); |
| 575 | |
| 576 | if (!elv_queue_empty(q)) |
| 577 | blk_plug_device(q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | } |
| 579 | |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 580 | static void ide_plug_device(ide_drive_t *drive) |
| 581 | { |
| 582 | struct request_queue *q = drive->queue; |
| 583 | unsigned long flags; |
| 584 | |
| 585 | spin_lock_irqsave(q->queue_lock, flags); |
| 586 | if (!elv_queue_empty(q)) |
| 587 | blk_plug_device(q); |
| 588 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 589 | } |
| 590 | |
Bartlomiej Zolnierkiewicz | b6a45a0 | 2009-03-24 23:22:43 +0100 | [diff] [blame] | 591 | static int drive_is_ready(ide_drive_t *drive) |
| 592 | { |
| 593 | ide_hwif_t *hwif = drive->hwif; |
| 594 | u8 stat = 0; |
| 595 | |
| 596 | if (drive->waiting_for_dma) |
| 597 | return hwif->dma_ops->dma_test_irq(drive); |
| 598 | |
| 599 | if (hwif->io_ports.ctl_addr && |
| 600 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) |
| 601 | stat = hwif->tp_ops->read_altstatus(hwif); |
| 602 | else |
| 603 | /* Note: this may clear a pending IRQ!! */ |
| 604 | stat = hwif->tp_ops->read_status(hwif); |
| 605 | |
| 606 | if (stat & ATA_BUSY) |
| 607 | /* drive busy: definitely not interrupting */ |
| 608 | return 0; |
| 609 | |
| 610 | /* drive ready: *might* be interrupting */ |
| 611 | return 1; |
| 612 | } |
| 613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | /** |
| 615 | * ide_timer_expiry - handle lack of an IDE interrupt |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 616 | * @data: timer callback magic (hwif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | * |
| 618 | * An IDE command has timed out before the expected drive return |
| 619 | * occurred. At this point we attempt to clean up the current |
| 620 | * mess. If the current handler includes an expiry handler then |
| 621 | * we invoke the expiry handler, and providing it is happy the |
| 622 | * work is done. If that fails we apply generic recovery rules |
| 623 | * invoking the handler and checking the drive DMA status. We |
| 624 | * have an excessively incestuous relationship with the DMA |
| 625 | * logic that wants cleaning up. |
| 626 | */ |
| 627 | |
| 628 | void ide_timer_expiry (unsigned long data) |
| 629 | { |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 630 | ide_hwif_t *hwif = (ide_hwif_t *)data; |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 631 | ide_drive_t *uninitialized_var(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | ide_handler_t *handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | unsigned long flags; |
Roel Kluin | e0c6dcd | 2009-03-05 16:10:55 +0100 | [diff] [blame] | 634 | int wait = -1; |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 635 | int plug_device = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 637 | spin_lock_irqsave(&hwif->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 639 | handler = hwif->handler; |
| 640 | |
| 641 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | /* |
| 643 | * Either a marginal timeout occurred |
| 644 | * (got the interrupt just as timer expired), |
| 645 | * or we were "sleeping" to give other devices a chance. |
| 646 | * Either way, we don't really want to complain about anything. |
| 647 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | } else { |
Bartlomiej Zolnierkiewicz | c38714e | 2009-01-06 17:20:59 +0100 | [diff] [blame] | 649 | ide_expiry_t *expiry = hwif->expiry; |
| 650 | ide_startstop_t startstop = ide_stopped; |
Bartlomiej Zolnierkiewicz | b2cfb05 | 2009-01-02 16:12:49 +0100 | [diff] [blame] | 651 | |
Bartlomiej Zolnierkiewicz | c38714e | 2009-01-06 17:20:59 +0100 | [diff] [blame] | 652 | drive = hwif->cur_dev; |
| 653 | |
| 654 | if (expiry) { |
| 655 | wait = expiry(drive); |
| 656 | if (wait > 0) { /* continue */ |
| 657 | /* reset timer */ |
| 658 | hwif->timer.expires = jiffies + wait; |
| 659 | hwif->req_gen_timer = hwif->req_gen; |
| 660 | add_timer(&hwif->timer); |
| 661 | spin_unlock_irqrestore(&hwif->lock, flags); |
| 662 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | } |
Bartlomiej Zolnierkiewicz | c38714e | 2009-01-06 17:20:59 +0100 | [diff] [blame] | 664 | } |
| 665 | hwif->handler = NULL; |
Bartlomiej Zolnierkiewicz | 60c0cd0 | 2009-03-27 12:46:46 +0100 | [diff] [blame] | 666 | hwif->expiry = NULL; |
Bartlomiej Zolnierkiewicz | c38714e | 2009-01-06 17:20:59 +0100 | [diff] [blame] | 667 | /* |
| 668 | * We need to simulate a real interrupt when invoking |
| 669 | * the handler() function, which means we need to |
| 670 | * globally mask the specific IRQ: |
| 671 | */ |
| 672 | spin_unlock(&hwif->lock); |
| 673 | /* disable_irq_nosync ?? */ |
| 674 | disable_irq(hwif->irq); |
| 675 | /* local CPU only, as if we were handling an interrupt */ |
| 676 | local_irq_disable(); |
| 677 | if (hwif->polling) { |
| 678 | startstop = handler(drive); |
| 679 | } else if (drive_is_ready(drive)) { |
| 680 | if (drive->waiting_for_dma) |
| 681 | hwif->dma_ops->dma_lost_irq(drive); |
Bartlomiej Zolnierkiewicz | d15a613 | 2009-03-27 12:46:21 +0100 | [diff] [blame] | 682 | if (hwif->ack_intr) |
| 683 | hwif->ack_intr(hwif); |
Bartlomiej Zolnierkiewicz | c38714e | 2009-01-06 17:20:59 +0100 | [diff] [blame] | 684 | printk(KERN_WARNING "%s: lost interrupt\n", |
| 685 | drive->name); |
| 686 | startstop = handler(drive); |
| 687 | } else { |
| 688 | if (drive->waiting_for_dma) |
| 689 | startstop = ide_dma_timeout_retry(drive, wait); |
| 690 | else |
| 691 | startstop = ide_error(drive, "irq timeout", |
| 692 | hwif->tp_ops->read_status(hwif)); |
| 693 | } |
| 694 | spin_lock_irq(&hwif->lock); |
| 695 | enable_irq(hwif->irq); |
| 696 | if (startstop == ide_stopped) { |
| 697 | ide_unlock_port(hwif); |
| 698 | plug_device = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | } |
| 700 | } |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 701 | spin_unlock_irqrestore(&hwif->lock, flags); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 702 | |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 703 | if (plug_device) { |
| 704 | ide_unlock_host(hwif->host); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 705 | ide_plug_device(drive); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 706 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | } |
| 708 | |
| 709 | /** |
| 710 | * unexpected_intr - handle an unexpected IDE interrupt |
| 711 | * @irq: interrupt line |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 712 | * @hwif: port being processed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | * |
| 714 | * There's nothing really useful we can do with an unexpected interrupt, |
| 715 | * other than reading the status register (to clear it), and logging it. |
| 716 | * There should be no way that an irq can happen before we're ready for it, |
| 717 | * so we needn't worry much about losing an "important" interrupt here. |
| 718 | * |
| 719 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever |
| 720 | * the drive enters "idle", "standby", or "sleep" mode, so if the status |
| 721 | * looks "good", we just ignore the interrupt completely. |
| 722 | * |
| 723 | * This routine assumes __cli() is in effect when called. |
| 724 | * |
| 725 | * If an unexpected interrupt happens on irq15 while we are handling irq14 |
| 726 | * and if the two interfaces are "serialized" (CMD640), then it looks like |
| 727 | * we could screw up by interfering with a new request being set up for |
| 728 | * irq15. |
| 729 | * |
| 730 | * In reality, this is a non-issue. The new command is not sent unless |
| 731 | * the drive is ready to accept one, in which case we know the drive is |
| 732 | * not trying to interrupt us. And ide_set_handler() is always invoked |
| 733 | * before completing the issuance of any new drive command, so we will not |
| 734 | * be accidentally invoked as a result of any valid command completion |
| 735 | * interrupt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | */ |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 737 | |
| 738 | static void unexpected_intr(int irq, ide_hwif_t *hwif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | { |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 740 | u8 stat = hwif->tp_ops->read_status(hwif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 742 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { |
| 743 | /* Try to not flood the console with msgs */ |
| 744 | static unsigned long last_msgtime, count; |
| 745 | ++count; |
Bartlomiej Zolnierkiewicz | b73c7ee | 2008-07-23 19:55:52 +0200 | [diff] [blame] | 746 | |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 747 | if (time_after(jiffies, last_msgtime + HZ)) { |
| 748 | last_msgtime = jiffies; |
| 749 | printk(KERN_ERR "%s: unexpected interrupt, " |
| 750 | "status=0x%02x, count=%ld\n", |
| 751 | hwif->name, stat, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | } |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 753 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | } |
| 755 | |
| 756 | /** |
| 757 | * ide_intr - default IDE interrupt handler |
| 758 | * @irq: interrupt number |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 759 | * @dev_id: hwif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | * @regs: unused weirdness from the kernel irq layer |
| 761 | * |
| 762 | * This is the default IRQ handler for the IDE layer. You should |
| 763 | * not need to override it. If you do be aware it is subtle in |
| 764 | * places |
| 765 | * |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 766 | * hwif is the interface in the group currently performing |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 767 | * a command. hwif->cur_dev is the drive and hwif->handler is |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | * the IRQ handler to call. As we issue a command the handlers |
| 769 | * step through multiple states, reassigning the handler to the |
| 770 | * next step in the process. Unlike a smart SCSI controller IDE |
| 771 | * expects the main processor to sequence the various transfer |
| 772 | * stages. We also manage a poll timer to catch up with most |
| 773 | * timeout situations. There are still a few where the handlers |
| 774 | * don't ever decide to give up. |
| 775 | * |
| 776 | * The handler eventually returns ide_stopped to indicate the |
| 777 | * request completed. At this point we issue the next request |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 778 | * on the port and the process begins again. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | */ |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 780 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 781 | irqreturn_t ide_intr (int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | { |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 783 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
Bartlomiej Zolnierkiewicz | 255115fb | 2009-03-27 12:46:27 +0100 | [diff] [blame] | 784 | struct ide_host *host = hwif->host; |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 785 | ide_drive_t *uninitialized_var(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | ide_handler_t *handler; |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 787 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | ide_startstop_t startstop; |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 789 | irqreturn_t irq_ret = IRQ_NONE; |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 790 | int plug_device = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | |
Bartlomiej Zolnierkiewicz | 255115fb | 2009-03-27 12:46:27 +0100 | [diff] [blame] | 792 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
| 793 | if (hwif != host->cur_port) |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 794 | goto out_early; |
| 795 | } |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 796 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 797 | spin_lock_irqsave(&hwif->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | |
Bartlomiej Zolnierkiewicz | d15a613 | 2009-03-27 12:46:21 +0100 | [diff] [blame] | 799 | if (hwif->ack_intr && hwif->ack_intr(hwif) == 0) |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 800 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 802 | handler = hwif->handler; |
| 803 | |
| 804 | if (handler == NULL || hwif->polling) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | /* |
| 806 | * Not expecting an interrupt from this drive. |
| 807 | * That means this could be: |
| 808 | * (1) an interrupt from another PCI device |
| 809 | * sharing the same PCI INT# as us. |
| 810 | * or (2) a drive just entered sleep or standby mode, |
| 811 | * and is interrupting to let us know. |
| 812 | * or (3) a spurious interrupt of unknown origin. |
| 813 | * |
| 814 | * For PCI, we cannot tell the difference, |
| 815 | * so in that case we just ignore it and hope it goes away. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | */ |
Bartlomiej Zolnierkiewicz | 255115fb | 2009-03-27 12:46:27 +0100 | [diff] [blame] | 817 | if ((host->irq_flags & IRQF_SHARED) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | /* |
| 819 | * Probably not a shared PCI interrupt, |
| 820 | * so we can safely try to do something about it: |
| 821 | */ |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 822 | unexpected_intr(irq, hwif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | } else { |
| 824 | /* |
| 825 | * Whack the status register, just in case |
| 826 | * we have a leftover pending IRQ. |
| 827 | */ |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 828 | (void)hwif->tp_ops->read_status(hwif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | } |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 830 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | } |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 832 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 833 | drive = hwif->cur_dev; |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 834 | |
| 835 | if (!drive_is_ready(drive)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | /* |
| 837 | * This happens regularly when we share a PCI IRQ with |
| 838 | * another device. Unfortunately, it can also happen |
| 839 | * with some buggy drives that trigger the IRQ before |
| 840 | * their status register is up to date. Hopefully we have |
| 841 | * enough advance overhead that the latter isn't a problem. |
| 842 | */ |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 843 | goto out; |
| 844 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 845 | hwif->handler = NULL; |
Bartlomiej Zolnierkiewicz | 60c0cd0 | 2009-03-27 12:46:46 +0100 | [diff] [blame] | 846 | hwif->expiry = NULL; |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 847 | hwif->req_gen++; |
| 848 | del_timer(&hwif->timer); |
| 849 | spin_unlock(&hwif->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | |
Bartlomiej Zolnierkiewicz | bfa7d8e | 2008-10-13 21:39:42 +0200 | [diff] [blame] | 851 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
| 852 | hwif->port_ops->clear_irq(drive); |
Albert Lee | f0dd871 | 2007-02-17 02:40:21 +0100 | [diff] [blame] | 853 | |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 854 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
Ingo Molnar | 366c7f5 | 2006-07-03 00:25:25 -0700 | [diff] [blame] | 855 | local_irq_enable_in_hardirq(); |
Bartlomiej Zolnierkiewicz | bfa7d8e | 2008-10-13 21:39:42 +0200 | [diff] [blame] | 856 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | /* service this interrupt, may set handler for next interrupt */ |
| 858 | startstop = handler(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 860 | spin_lock_irq(&hwif->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | /* |
| 862 | * Note that handler() may have set things up for another |
| 863 | * interrupt to occur soon, but it cannot happen until |
| 864 | * we exit from this routine, because it will be the |
| 865 | * same irq as is currently being serviced here, and Linux |
| 866 | * won't allow another of the same (on any CPU) until we return. |
| 867 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | if (startstop == ide_stopped) { |
Bartlomiej Zolnierkiewicz | 9600dcf | 2009-01-06 17:20:58 +0100 | [diff] [blame] | 869 | BUG_ON(hwif->handler); |
| 870 | ide_unlock_port(hwif); |
| 871 | plug_device = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | } |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 873 | irq_ret = IRQ_HANDLED; |
| 874 | out: |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 875 | spin_unlock_irqrestore(&hwif->lock, flags); |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 876 | out_early: |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 877 | if (plug_device) { |
| 878 | ide_unlock_host(hwif->host); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 879 | ide_plug_device(drive); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 880 | } |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 881 | |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 882 | return irq_ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | } |
Stanislaw Gruszka | 849d713 | 2009-03-05 16:10:57 +0100 | [diff] [blame] | 884 | EXPORT_SYMBOL_GPL(ide_intr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
Bartlomiej Zolnierkiewicz | 9f87abe | 2008-04-28 23:44:41 +0200 | [diff] [blame] | 886 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
| 887 | { |
| 888 | ide_hwif_t *hwif = drive->hwif; |
| 889 | u8 buf[4] = { 0 }; |
| 890 | |
| 891 | while (len > 0) { |
| 892 | if (write) |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 893 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
Bartlomiej Zolnierkiewicz | 9f87abe | 2008-04-28 23:44:41 +0200 | [diff] [blame] | 894 | else |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 895 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
Bartlomiej Zolnierkiewicz | 9f87abe | 2008-04-28 23:44:41 +0200 | [diff] [blame] | 896 | len -= 4; |
| 897 | } |
| 898 | } |
| 899 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |