blob: 86439a0bb271c2e815bd940e21d19e67bcaaf572 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Block driver for media (i.e., flash cards)
3 *
4 * Copyright 2002 Hewlett-Packard Company
5 *
6 * Use consistent with the GNU GPL is permitted,
7 * provided that this copyright notice is
8 * preserved in its entirety in all copies and derived works.
9 *
10 * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
11 * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
12 * FITNESS FOR ANY PARTICULAR PURPOSE.
13 *
14 * Many thanks to Alessandro Rubini and Jonathan Corbet!
15 *
16 * Author: Andrew Christian
17 * 28 May 2002
18 */
19#include <linux/moduleparam.h>
20#include <linux/module.h>
21#include <linux/init.h>
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/kernel.h>
24#include <linux/fs.h>
25#include <linux/errno.h>
26#include <linux/hdreg.h>
27#include <linux/kdev_t.h>
28#include <linux/blkdev.h>
Arjan van de Vena621aae2006-01-12 18:43:35 +000029#include <linux/mutex.h>
Pierre Ossmanec5a19d2006-10-06 00:44:03 -070030#include <linux/scatterlist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32#include <linux/mmc/card.h>
Pierre Ossman385e3222006-06-18 14:34:37 +020033#include <linux/mmc/host.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/mmc/protocol.h>
Russell Kingdb53f282006-08-30 15:14:56 +010035#include <linux/mmc/host.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37#include <asm/system.h>
38#include <asm/uaccess.h>
39
40#include "mmc_queue.h"
41
42/*
43 * max 8 partitions per card
44 */
45#define MMC_SHIFT 3
46
47static int major;
48
49/*
50 * There is one mmc_blk_data per slot.
51 */
52struct mmc_blk_data {
53 spinlock_t lock;
54 struct gendisk *disk;
55 struct mmc_queue queue;
56
57 unsigned int usage;
58 unsigned int block_bits;
Russell Kinga6f6c962006-01-03 22:38:44 +000059 unsigned int read_only;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060};
61
Arjan van de Vena621aae2006-01-12 18:43:35 +000062static DEFINE_MUTEX(open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
65{
66 struct mmc_blk_data *md;
67
Arjan van de Vena621aae2006-01-12 18:43:35 +000068 mutex_lock(&open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 md = disk->private_data;
70 if (md && md->usage == 0)
71 md = NULL;
72 if (md)
73 md->usage++;
Arjan van de Vena621aae2006-01-12 18:43:35 +000074 mutex_unlock(&open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76 return md;
77}
78
79static void mmc_blk_put(struct mmc_blk_data *md)
80{
Arjan van de Vena621aae2006-01-12 18:43:35 +000081 mutex_lock(&open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 md->usage--;
83 if (md->usage == 0) {
84 put_disk(md->disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 kfree(md);
86 }
Arjan van de Vena621aae2006-01-12 18:43:35 +000087 mutex_unlock(&open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088}
89
90static int mmc_blk_open(struct inode *inode, struct file *filp)
91{
92 struct mmc_blk_data *md;
93 int ret = -ENXIO;
94
95 md = mmc_blk_get(inode->i_bdev->bd_disk);
96 if (md) {
97 if (md->usage == 2)
98 check_disk_change(inode->i_bdev);
99 ret = 0;
Pierre Ossmana00fc092005-09-06 15:18:52 -0700100
Russell Kinga6f6c962006-01-03 22:38:44 +0000101 if ((filp->f_mode & FMODE_WRITE) && md->read_only)
Pierre Ossmana00fc092005-09-06 15:18:52 -0700102 ret = -EROFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 }
104
105 return ret;
106}
107
108static int mmc_blk_release(struct inode *inode, struct file *filp)
109{
110 struct mmc_blk_data *md = inode->i_bdev->bd_disk->private_data;
111
112 mmc_blk_put(md);
113 return 0;
114}
115
116static int
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800117mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118{
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800119 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
120 geo->heads = 4;
121 geo->sectors = 16;
122 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123}
124
125static struct block_device_operations mmc_bdops = {
126 .open = mmc_blk_open,
127 .release = mmc_blk_release,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800128 .getgeo = mmc_blk_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 .owner = THIS_MODULE,
130};
131
132struct mmc_blk_request {
133 struct mmc_request mrq;
134 struct mmc_command cmd;
135 struct mmc_command stop;
136 struct mmc_data data;
137};
138
139static int mmc_blk_prep_rq(struct mmc_queue *mq, struct request *req)
140{
141 struct mmc_blk_data *md = mq->data;
142 int stat = BLKPREP_OK;
143
144 /*
145 * If we have no device, we haven't finished initialising.
146 */
147 if (!md || !mq->card) {
148 printk(KERN_ERR "%s: killing request - no device/host\n",
149 req->rq_disk->disk_name);
150 stat = BLKPREP_KILL;
151 }
152
153 return stat;
154}
155
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700156static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
157{
158 int err;
159 u32 blocks;
160
161 struct mmc_request mrq;
162 struct mmc_command cmd;
163 struct mmc_data data;
164 unsigned int timeout_us;
165
166 struct scatterlist sg;
167
168 memset(&cmd, 0, sizeof(struct mmc_command));
169
170 cmd.opcode = MMC_APP_CMD;
171 cmd.arg = card->rca << 16;
172 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
173
174 err = mmc_wait_for_cmd(card->host, &cmd, 0);
175 if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD))
176 return (u32)-1;
177
178 memset(&cmd, 0, sizeof(struct mmc_command));
179
180 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
181 cmd.arg = 0;
182 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
183
184 memset(&data, 0, sizeof(struct mmc_data));
185
186 data.timeout_ns = card->csd.tacc_ns * 100;
187 data.timeout_clks = card->csd.tacc_clks * 100;
188
189 timeout_us = data.timeout_ns / 1000;
190 timeout_us += data.timeout_clks * 1000 /
191 (card->host->ios.clock / 1000);
192
193 if (timeout_us > 100000) {
194 data.timeout_ns = 100000000;
195 data.timeout_clks = 0;
196 }
197
198 data.blksz = 4;
199 data.blocks = 1;
200 data.flags = MMC_DATA_READ;
201 data.sg = &sg;
202 data.sg_len = 1;
203
204 memset(&mrq, 0, sizeof(struct mmc_request));
205
206 mrq.cmd = &cmd;
207 mrq.data = &data;
208
209 sg_init_one(&sg, &blocks, 4);
210
211 mmc_wait_for_req(card->host, &mrq);
212
213 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE)
214 return (u32)-1;
215
216 blocks = ntohl(blocks);
217
218 return blocks;
219}
220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
222{
223 struct mmc_blk_data *md = mq->data;
224 struct mmc_card *card = md->queue.card;
Pierre Ossman176f00f2006-10-04 02:15:41 -0700225 struct mmc_blk_request brq;
Pierre Ossman8b7feff2006-11-14 22:13:13 +0100226 int ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 if (mmc_card_claim_host(card))
Pierre Ossman8b7feff2006-11-14 22:13:13 +0100229 goto flush_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 struct mmc_command cmd;
Russell Kingdb53f282006-08-30 15:14:56 +0100233 u32 readcmd, writecmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235 memset(&brq, 0, sizeof(struct mmc_blk_request));
236 brq.mrq.cmd = &brq.cmd;
237 brq.mrq.data = &brq.data;
238
Philip Langdalefba68bd2007-01-04 06:57:32 -0800239 brq.cmd.arg = req->sector;
240 if (!mmc_card_blockaddr(card))
241 brq.cmd.arg <<= 9;
Russell Kinge9225172006-02-02 12:23:12 +0000242 brq.cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
Pavel Pisa2c171bf2006-05-19 21:48:03 +0100243 brq.data.blksz = 1 << md->block_bits;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 brq.stop.opcode = MMC_STOP_TRANSMISSION;
245 brq.stop.arg = 0;
Russell Kinge9225172006-02-02 12:23:12 +0000246 brq.stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
Pierre Ossman55db8902006-11-21 17:55:45 +0100247 brq.data.blocks = req->nr_sectors >> (md->block_bits - 9);
248 if (brq.data.blocks > card->host->max_blk_count)
249 brq.data.blocks = card->host->max_blk_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Russell Kingd773d722006-09-07 15:57:12 +0100251 mmc_set_data_timeout(&brq.data, card, rq_data_dir(req) != READ);
Pierre Ossman385e3222006-06-18 14:34:37 +0200252
Russell Kingdb53f282006-08-30 15:14:56 +0100253 /*
254 * If the host doesn't support multiple block writes, force
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700255 * block writes to single block. SD cards are excepted from
256 * this rule as they support querying the number of
257 * successfully written sectors.
Russell Kingdb53f282006-08-30 15:14:56 +0100258 */
259 if (rq_data_dir(req) != READ &&
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700260 !(card->host->caps & MMC_CAP_MULTIWRITE) &&
261 !mmc_card_sd(card))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 brq.data.blocks = 1;
Russell King788ee7b2006-01-09 21:12:17 +0000263
264 if (brq.data.blocks > 1) {
265 brq.data.flags |= MMC_DATA_MULTI;
266 brq.mrq.stop = &brq.stop;
Russell Kingdb53f282006-08-30 15:14:56 +0100267 readcmd = MMC_READ_MULTIPLE_BLOCK;
268 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
Russell King788ee7b2006-01-09 21:12:17 +0000269 } else {
270 brq.mrq.stop = NULL;
Russell Kingdb53f282006-08-30 15:14:56 +0100271 readcmd = MMC_READ_SINGLE_BLOCK;
272 writecmd = MMC_WRITE_BLOCK;
273 }
274
275 if (rq_data_dir(req) == READ) {
276 brq.cmd.opcode = readcmd;
277 brq.data.flags |= MMC_DATA_READ;
278 } else {
279 brq.cmd.opcode = writecmd;
280 brq.data.flags |= MMC_DATA_WRITE;
Russell King788ee7b2006-01-09 21:12:17 +0000281 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
283 brq.data.sg = mq->sg;
284 brq.data.sg_len = blk_rq_map_sg(req->q, req, brq.data.sg);
285
286 mmc_wait_for_req(card->host, &brq.mrq);
287 if (brq.cmd.error) {
288 printk(KERN_ERR "%s: error %d sending read/write command\n",
289 req->rq_disk->disk_name, brq.cmd.error);
290 goto cmd_err;
291 }
292
293 if (brq.data.error) {
294 printk(KERN_ERR "%s: error %d transferring data\n",
295 req->rq_disk->disk_name, brq.data.error);
296 goto cmd_err;
297 }
298
299 if (brq.stop.error) {
300 printk(KERN_ERR "%s: error %d sending stop command\n",
301 req->rq_disk->disk_name, brq.stop.error);
302 goto cmd_err;
303 }
304
Russell King2ed6d222006-09-24 10:46:43 +0100305 if (rq_data_dir(req) != READ) {
306 do {
307 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Russell King2ed6d222006-09-24 10:46:43 +0100309 cmd.opcode = MMC_SEND_STATUS;
310 cmd.arg = card->rca << 16;
311 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
312 err = mmc_wait_for_cmd(card->host, &cmd, 5);
313 if (err) {
314 printk(KERN_ERR "%s: error %d requesting status\n",
315 req->rq_disk->disk_name, err);
316 goto cmd_err;
317 }
318 } while (!(cmd.resp[0] & R1_READY_FOR_DATA));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
320#if 0
Russell King2ed6d222006-09-24 10:46:43 +0100321 if (cmd.resp[0] & ~0x00000900)
322 printk(KERN_ERR "%s: status = %08x\n",
323 req->rq_disk->disk_name, cmd.resp[0]);
324 if (mmc_decode_status(cmd.resp))
325 goto cmd_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326#endif
Russell King2ed6d222006-09-24 10:46:43 +0100327 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
329 /*
330 * A block was successfully transferred.
331 */
332 spin_lock_irq(&md->lock);
333 ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
334 if (!ret) {
335 /*
336 * The whole request completed successfully.
337 */
338 add_disk_randomness(req->rq_disk);
339 blkdev_dequeue_request(req);
Tejun Heo8ffdc652006-01-06 09:49:03 +0100340 end_that_request_last(req, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 }
342 spin_unlock_irq(&md->lock);
343 } while (ret);
344
345 mmc_card_release_host(card);
346
347 return 1;
348
349 cmd_err:
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700350 /*
351 * If this is an SD card and we're writing, we can first
352 * mark the known good sectors as ok.
353 *
354 * If the card is not SD, we can still ok written sectors
355 * if the controller can do proper error reporting.
Pierre Ossman176f00f2006-10-04 02:15:41 -0700356 *
357 * For reads we just fail the entire chunk as that should
358 * be safe in all cases.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 */
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700360 if (rq_data_dir(req) != READ && mmc_card_sd(card)) {
361 u32 blocks;
362 unsigned int bytes;
363
364 blocks = mmc_sd_num_wr_blocks(card);
365 if (blocks != (u32)-1) {
366 if (card->csd.write_partial)
367 bytes = blocks << md->block_bits;
368 else
369 bytes = blocks << 9;
370 spin_lock_irq(&md->lock);
371 ret = end_that_request_chunk(req, 1, bytes);
372 spin_unlock_irq(&md->lock);
373 }
374 } else if (rq_data_dir(req) != READ &&
375 (card->host->caps & MMC_CAP_MULTIWRITE)) {
Pierre Ossman176f00f2006-10-04 02:15:41 -0700376 spin_lock_irq(&md->lock);
377 ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
378 spin_unlock_irq(&md->lock);
379 }
380
Pierre Ossman397411e2007-01-30 07:48:04 +0100381flush_queue:
382
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700383 mmc_card_release_host(card);
384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 spin_lock_irq(&md->lock);
Pierre Ossman176f00f2006-10-04 02:15:41 -0700386 while (ret) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 ret = end_that_request_chunk(req, 0,
388 req->current_nr_sectors << 9);
Pierre Ossman176f00f2006-10-04 02:15:41 -0700389 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
391 add_disk_randomness(req->rq_disk);
392 blkdev_dequeue_request(req);
Tejun Heo8ffdc652006-01-06 09:49:03 +0100393 end_that_request_last(req, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 spin_unlock_irq(&md->lock);
395
396 return 0;
397}
398
399#define MMC_NUM_MINORS (256 >> MMC_SHIFT)
400
401static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))];
402
Russell Kinga6f6c962006-01-03 22:38:44 +0000403static inline int mmc_blk_readonly(struct mmc_card *card)
404{
405 return mmc_card_readonly(card) ||
406 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
407}
408
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
410{
411 struct mmc_blk_data *md;
412 int devidx, ret;
413
414 devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
415 if (devidx >= MMC_NUM_MINORS)
416 return ERR_PTR(-ENOSPC);
417 __set_bit(devidx, dev_use);
418
419 md = kmalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
Russell Kinga6f6c962006-01-03 22:38:44 +0000420 if (!md) {
421 ret = -ENOMEM;
422 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 }
Russell Kinga6f6c962006-01-03 22:38:44 +0000424
425 memset(md, 0, sizeof(struct mmc_blk_data));
426
427 /*
428 * Set the read-only status based on the supported commands
429 * and the write protect switch.
430 */
431 md->read_only = mmc_blk_readonly(card);
432
433 /*
Pierre Ossman6fe9feb2006-09-07 16:01:30 +0100434 * Both SD and MMC specifications state (although a bit
435 * unclearly in the MMC case) that a block size of 512
436 * bytes must always be supported by the card.
Russell Kinga6f6c962006-01-03 22:38:44 +0000437 */
Pierre Ossman6fe9feb2006-09-07 16:01:30 +0100438 md->block_bits = 9;
Russell Kinga6f6c962006-01-03 22:38:44 +0000439
440 md->disk = alloc_disk(1 << MMC_SHIFT);
441 if (md->disk == NULL) {
442 ret = -ENOMEM;
443 goto err_kfree;
444 }
445
446 spin_lock_init(&md->lock);
447 md->usage = 1;
448
449 ret = mmc_init_queue(&md->queue, card, &md->lock);
450 if (ret)
451 goto err_putdisk;
452
453 md->queue.prep_fn = mmc_blk_prep_rq;
454 md->queue.issue_fn = mmc_blk_issue_rq;
455 md->queue.data = md;
456
457 md->disk->major = major;
458 md->disk->first_minor = devidx << MMC_SHIFT;
459 md->disk->fops = &mmc_bdops;
460 md->disk->private_data = md;
461 md->disk->queue = md->queue.queue;
462 md->disk->driverfs_dev = &card->dev;
463
464 /*
465 * As discussed on lkml, GENHD_FL_REMOVABLE should:
466 *
467 * - be set for removable media with permanent block devices
468 * - be unset for removable block devices with permanent media
469 *
470 * Since MMC block devices clearly fall under the second
471 * case, we do not set GENHD_FL_REMOVABLE. Userspace
472 * should use the block device creation/destruction hotplug
473 * messages to tell when the card is present.
474 */
475
476 sprintf(md->disk->disk_name, "mmcblk%d", devidx);
Russell Kinga6f6c962006-01-03 22:38:44 +0000477
478 blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits);
479
480 /*
481 * The CSD capacity field is in units of read_blkbits.
482 * set_capacity takes units of 512 bytes.
483 */
484 set_capacity(md->disk, card->csd.capacity << (card->csd.read_blkbits - 9));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 return md;
Russell Kinga6f6c962006-01-03 22:38:44 +0000486
487 err_putdisk:
488 put_disk(md->disk);
489 err_kfree:
490 kfree(md);
491 out:
492 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493}
494
495static int
496mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
497{
498 struct mmc_command cmd;
499 int err;
500
Philip Langdalefba68bd2007-01-04 06:57:32 -0800501 /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
502 if (mmc_card_blockaddr(card))
503 return 0;
504
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 mmc_card_claim_host(card);
506 cmd.opcode = MMC_SET_BLOCKLEN;
Russell Kingd2b18392005-12-22 23:21:38 +0000507 cmd.arg = 1 << md->block_bits;
Russell Kinge9225172006-02-02 12:23:12 +0000508 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 err = mmc_wait_for_cmd(card->host, &cmd, 5);
510 mmc_card_release_host(card);
511
512 if (err) {
513 printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
514 md->disk->disk_name, cmd.arg, err);
515 return -EINVAL;
516 }
517
518 return 0;
519}
520
521static int mmc_blk_probe(struct mmc_card *card)
522{
523 struct mmc_blk_data *md;
524 int err;
525
Pierre Ossman912490d2005-05-21 10:27:02 +0100526 /*
527 * Check that the card supports the command class(es) we need.
528 */
529 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 return -ENODEV;
531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 md = mmc_blk_alloc(card);
533 if (IS_ERR(md))
534 return PTR_ERR(md);
535
536 err = mmc_blk_set_blksize(md, card);
537 if (err)
538 goto out;
539
Andrew Morton51828ab2006-01-13 21:44:18 +0000540 printk(KERN_INFO "%s: %s %s %lluKiB %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
Andrew Morton51828ab2006-01-13 21:44:18 +0000542 (unsigned long long)(get_capacity(md->disk) >> 1),
543 md->read_only ? "(ro)" : "");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
545 mmc_set_drvdata(card, md);
546 add_disk(md->disk);
547 return 0;
548
549 out:
550 mmc_blk_put(md);
551
552 return err;
553}
554
555static void mmc_blk_remove(struct mmc_card *card)
556{
557 struct mmc_blk_data *md = mmc_get_drvdata(card);
558
559 if (md) {
560 int devidx;
561
Pierre Ossman89b4e132006-11-14 22:08:16 +0100562 /* Stop new requests from getting into the queue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 del_gendisk(md->disk);
564
Pierre Ossman89b4e132006-11-14 22:08:16 +0100565 /* Then flush out any already in there */
566 mmc_cleanup_queue(&md->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
568 devidx = md->disk->first_minor >> MMC_SHIFT;
569 __clear_bit(devidx, dev_use);
570
571 mmc_blk_put(md);
572 }
573 mmc_set_drvdata(card, NULL);
574}
575
576#ifdef CONFIG_PM
577static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
578{
579 struct mmc_blk_data *md = mmc_get_drvdata(card);
580
581 if (md) {
582 mmc_queue_suspend(&md->queue);
583 }
584 return 0;
585}
586
587static int mmc_blk_resume(struct mmc_card *card)
588{
589 struct mmc_blk_data *md = mmc_get_drvdata(card);
590
591 if (md) {
592 mmc_blk_set_blksize(md, card);
593 mmc_queue_resume(&md->queue);
594 }
595 return 0;
596}
597#else
598#define mmc_blk_suspend NULL
599#define mmc_blk_resume NULL
600#endif
601
602static struct mmc_driver mmc_driver = {
603 .drv = {
604 .name = "mmcblk",
605 },
606 .probe = mmc_blk_probe,
607 .remove = mmc_blk_remove,
608 .suspend = mmc_blk_suspend,
609 .resume = mmc_blk_resume,
610};
611
612static int __init mmc_blk_init(void)
613{
614 int res = -ENOMEM;
615
616 res = register_blkdev(major, "mmc");
617 if (res < 0) {
618 printk(KERN_WARNING "Unable to get major %d for MMC media: %d\n",
619 major, res);
620 goto out;
621 }
622 if (major == 0)
623 major = res;
624
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 return mmc_register_driver(&mmc_driver);
626
627 out:
628 return res;
629}
630
631static void __exit mmc_blk_exit(void)
632{
633 mmc_unregister_driver(&mmc_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 unregister_blkdev(major, "mmc");
635}
636
637module_init(mmc_blk_init);
638module_exit(mmc_blk_exit);
639
640MODULE_LICENSE("GPL");
641MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
642
643module_param(major, int, 0444);
644MODULE_PARM_DESC(major, "specify the major device number for MMC block driver");