blob: 24c97d3d16bba43ab963d9b514ee27fbe938ddcc [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
Pierre Ossman979ce722008-06-29 12:19:47 +02005 * Copyright 2005-2008 Pierre Ossman
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * Use consistent with the GNU GPL is permitted,
8 * provided that this copyright notice is
9 * preserved in its entirety in all copies and derived works.
10 *
11 * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
12 * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
13 * FITNESS FOR ANY PARTICULAR PURPOSE.
14 *
15 * Many thanks to Alessandro Rubini and Jonathan Corbet!
16 *
17 * Author: Andrew Christian
18 * 28 May 2002
19 */
20#include <linux/moduleparam.h>
21#include <linux/module.h>
22#include <linux/init.h>
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/kernel.h>
25#include <linux/fs.h>
26#include <linux/errno.h>
27#include <linux/hdreg.h>
28#include <linux/kdev_t.h>
29#include <linux/blkdev.h>
Arjan van de Vena621aae2006-01-12 18:43:35 +000030#include <linux/mutex.h>
Pierre Ossmanec5a19d2006-10-06 00:44:03 -070031#include <linux/scatterlist.h>
Pierre Ossmana7bbb572008-09-06 10:57:57 +020032#include <linux/string_helpers.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34#include <linux/mmc/card.h>
Pierre Ossman385e3222006-06-18 14:34:37 +020035#include <linux/mmc/host.h>
Pierre Ossmanda7fbe52006-12-24 22:46:55 +010036#include <linux/mmc/mmc.h>
37#include <linux/mmc/sd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <asm/system.h>
40#include <asm/uaccess.h>
41
Pierre Ossman98ac2162006-12-23 20:03:02 +010042#include "queue.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44/*
45 * max 8 partitions per card
46 */
47#define MMC_SHIFT 3
David Woodhouse1dff3142007-11-21 18:45:12 +010048#define MMC_NUM_MINORS (256 >> MMC_SHIFT)
49
Ben Collins203c8012008-06-05 19:10:21 -040050static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Linus Torvalds1da177e2005-04-16 15:20:36 -070052/*
53 * There is one mmc_blk_data per slot.
54 */
55struct mmc_blk_data {
56 spinlock_t lock;
57 struct gendisk *disk;
58 struct mmc_queue queue;
59
60 unsigned int usage;
Russell Kinga6f6c962006-01-03 22:38:44 +000061 unsigned int read_only;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062};
63
Arjan van de Vena621aae2006-01-12 18:43:35 +000064static DEFINE_MUTEX(open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
67{
68 struct mmc_blk_data *md;
69
Arjan van de Vena621aae2006-01-12 18:43:35 +000070 mutex_lock(&open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 md = disk->private_data;
72 if (md && md->usage == 0)
73 md = NULL;
74 if (md)
75 md->usage++;
Arjan van de Vena621aae2006-01-12 18:43:35 +000076 mutex_unlock(&open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78 return md;
79}
80
81static void mmc_blk_put(struct mmc_blk_data *md)
82{
Arjan van de Vena621aae2006-01-12 18:43:35 +000083 mutex_lock(&open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 md->usage--;
85 if (md->usage == 0) {
Tejun Heof331c022008-09-03 09:01:48 +020086 int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT;
David Woodhouse1dff3142007-11-21 18:45:12 +010087 __clear_bit(devidx, dev_use);
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 put_disk(md->disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 kfree(md);
91 }
Arjan van de Vena621aae2006-01-12 18:43:35 +000092 mutex_unlock(&open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093}
94
95static int mmc_blk_open(struct inode *inode, struct file *filp)
96{
97 struct mmc_blk_data *md;
98 int ret = -ENXIO;
99
100 md = mmc_blk_get(inode->i_bdev->bd_disk);
101 if (md) {
102 if (md->usage == 2)
103 check_disk_change(inode->i_bdev);
104 ret = 0;
Pierre Ossmana00fc092005-09-06 15:18:52 -0700105
Andrew Morton70bb0892008-09-05 14:00:24 -0700106 if ((filp->f_mode & FMODE_WRITE) && md->read_only) {
107 mmc_blk_put(md);
Pierre Ossmana00fc092005-09-06 15:18:52 -0700108 ret = -EROFS;
Andrew Morton70bb0892008-09-05 14:00:24 -0700109 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 }
111
112 return ret;
113}
114
115static int mmc_blk_release(struct inode *inode, struct file *filp)
116{
117 struct mmc_blk_data *md = inode->i_bdev->bd_disk->private_data;
118
119 mmc_blk_put(md);
120 return 0;
121}
122
123static int
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800124mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800126 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
127 geo->heads = 4;
128 geo->sectors = 16;
129 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130}
131
132static struct block_device_operations mmc_bdops = {
133 .open = mmc_blk_open,
134 .release = mmc_blk_release,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800135 .getgeo = mmc_blk_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 .owner = THIS_MODULE,
137};
138
139struct mmc_blk_request {
140 struct mmc_request mrq;
141 struct mmc_command cmd;
142 struct mmc_command stop;
143 struct mmc_data data;
144};
145
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700146static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
147{
148 int err;
149 u32 blocks;
150
151 struct mmc_request mrq;
152 struct mmc_command cmd;
153 struct mmc_data data;
154 unsigned int timeout_us;
155
156 struct scatterlist sg;
157
158 memset(&cmd, 0, sizeof(struct mmc_command));
159
160 cmd.opcode = MMC_APP_CMD;
161 cmd.arg = card->rca << 16;
David Brownell7213d172007-08-08 09:10:23 -0700162 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700163
164 err = mmc_wait_for_cmd(card->host, &cmd, 0);
David Brownell7213d172007-08-08 09:10:23 -0700165 if (err)
166 return (u32)-1;
167 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700168 return (u32)-1;
169
170 memset(&cmd, 0, sizeof(struct mmc_command));
171
172 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
173 cmd.arg = 0;
David Brownell7213d172007-08-08 09:10:23 -0700174 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700175
176 memset(&data, 0, sizeof(struct mmc_data));
177
178 data.timeout_ns = card->csd.tacc_ns * 100;
179 data.timeout_clks = card->csd.tacc_clks * 100;
180
181 timeout_us = data.timeout_ns / 1000;
182 timeout_us += data.timeout_clks * 1000 /
183 (card->host->ios.clock / 1000);
184
185 if (timeout_us > 100000) {
186 data.timeout_ns = 100000000;
187 data.timeout_clks = 0;
188 }
189
190 data.blksz = 4;
191 data.blocks = 1;
192 data.flags = MMC_DATA_READ;
193 data.sg = &sg;
194 data.sg_len = 1;
195
196 memset(&mrq, 0, sizeof(struct mmc_request));
197
198 mrq.cmd = &cmd;
199 mrq.data = &data;
200
201 sg_init_one(&sg, &blocks, 4);
202
203 mmc_wait_for_req(card->host, &mrq);
204
Pierre Ossman17b04292007-07-22 22:18:46 +0200205 if (cmd.error || data.error)
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700206 return (u32)-1;
207
208 blocks = ntohl(blocks);
209
210 return blocks;
211}
212
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
214{
215 struct mmc_blk_data *md = mq->data;
216 struct mmc_card *card = md->queue.card;
Pierre Ossman176f00f2006-10-04 02:15:41 -0700217 struct mmc_blk_request brq;
Pierre Ossmanf3eb0aa2008-08-16 21:34:02 +0200218 int ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Pierre Ossmanb8558852007-01-03 19:47:29 +0100220 mmc_claim_host(card->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
222 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 struct mmc_command cmd;
Russell Kingdb53f282006-08-30 15:14:56 +0100224 u32 readcmd, writecmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226 memset(&brq, 0, sizeof(struct mmc_blk_request));
227 brq.mrq.cmd = &brq.cmd;
228 brq.mrq.data = &brq.data;
229
Philip Langdalefba68bd2007-01-04 06:57:32 -0800230 brq.cmd.arg = req->sector;
231 if (!mmc_card_blockaddr(card))
232 brq.cmd.arg <<= 9;
David Brownell7213d172007-08-08 09:10:23 -0700233 brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
Pierre Ossman08846692008-08-31 14:10:08 +0200234 brq.data.blksz = 512;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 brq.stop.opcode = MMC_STOP_TRANSMISSION;
236 brq.stop.arg = 0;
David Brownell7213d172007-08-08 09:10:23 -0700237 brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
Pierre Ossman08846692008-08-31 14:10:08 +0200238 brq.data.blocks = req->nr_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
Russell King788ee7b2006-01-09 21:12:17 +0000240 if (brq.data.blocks > 1) {
David Brownell7213d172007-08-08 09:10:23 -0700241 /* SPI multiblock writes terminate using a special
242 * token, not a STOP_TRANSMISSION request.
243 */
244 if (!mmc_host_is_spi(card->host)
245 || rq_data_dir(req) == READ)
246 brq.mrq.stop = &brq.stop;
Russell Kingdb53f282006-08-30 15:14:56 +0100247 readcmd = MMC_READ_MULTIPLE_BLOCK;
248 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
Russell King788ee7b2006-01-09 21:12:17 +0000249 } else {
250 brq.mrq.stop = NULL;
Russell Kingdb53f282006-08-30 15:14:56 +0100251 readcmd = MMC_READ_SINGLE_BLOCK;
252 writecmd = MMC_WRITE_BLOCK;
253 }
254
255 if (rq_data_dir(req) == READ) {
256 brq.cmd.opcode = readcmd;
257 brq.data.flags |= MMC_DATA_READ;
258 } else {
259 brq.cmd.opcode = writecmd;
260 brq.data.flags |= MMC_DATA_WRITE;
Russell King788ee7b2006-01-09 21:12:17 +0000261 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Pierre Ossmanb146d262007-07-24 19:16:54 +0200263 mmc_set_data_timeout(&brq.data, card);
264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 brq.data.sg = mq->sg;
Pierre Ossman98ccf142007-05-12 00:26:16 +0200266 brq.data.sg_len = mmc_queue_map_sg(mq);
267
268 mmc_queue_bounce_pre(mq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
270 mmc_wait_for_req(card->host, &brq.mrq);
Pierre Ossman98ccf142007-05-12 00:26:16 +0200271
272 mmc_queue_bounce_post(mq);
273
Pierre Ossman979ce722008-06-29 12:19:47 +0200274 /*
275 * Check for errors here, but don't jump to cmd_err
276 * until later as we need to wait for the card to leave
277 * programming mode even when things go wrong.
278 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 if (brq.cmd.error) {
280 printk(KERN_ERR "%s: error %d sending read/write command\n",
281 req->rq_disk->disk_name, brq.cmd.error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 }
283
284 if (brq.data.error) {
285 printk(KERN_ERR "%s: error %d transferring data\n",
286 req->rq_disk->disk_name, brq.data.error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 }
288
289 if (brq.stop.error) {
290 printk(KERN_ERR "%s: error %d sending stop command\n",
291 req->rq_disk->disk_name, brq.stop.error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 }
293
David Brownell7213d172007-08-08 09:10:23 -0700294 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
Russell King2ed6d222006-09-24 10:46:43 +0100295 do {
296 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Russell King2ed6d222006-09-24 10:46:43 +0100298 cmd.opcode = MMC_SEND_STATUS;
299 cmd.arg = card->rca << 16;
300 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
301 err = mmc_wait_for_cmd(card->host, &cmd, 5);
302 if (err) {
303 printk(KERN_ERR "%s: error %d requesting status\n",
304 req->rq_disk->disk_name, err);
305 goto cmd_err;
306 }
Pierre Ossmand198f102007-11-02 18:21:13 +0100307 /*
308 * Some cards mishandle the status bits,
309 * so make sure to check both the busy
310 * indication and the card state.
311 */
312 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
313 (R1_CURRENT_STATE(cmd.resp[0]) == 7));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315#if 0
Russell King2ed6d222006-09-24 10:46:43 +0100316 if (cmd.resp[0] & ~0x00000900)
317 printk(KERN_ERR "%s: status = %08x\n",
318 req->rq_disk->disk_name, cmd.resp[0]);
319 if (mmc_decode_status(cmd.resp))
320 goto cmd_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321#endif
Russell King2ed6d222006-09-24 10:46:43 +0100322 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Pierre Ossman979ce722008-06-29 12:19:47 +0200324 if (brq.cmd.error || brq.data.error || brq.stop.error)
325 goto cmd_err;
326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 /*
328 * A block was successfully transferred.
329 */
330 spin_lock_irq(&md->lock);
Kiyoshi Uedafd539832007-12-11 17:48:29 -0500331 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 spin_unlock_irq(&md->lock);
333 } while (ret);
334
Pierre Ossmanb8558852007-01-03 19:47:29 +0100335 mmc_release_host(card->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337 return 1;
338
339 cmd_err:
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700340 /*
341 * If this is an SD card and we're writing, we can first
342 * mark the known good sectors as ok.
343 *
344 * If the card is not SD, we can still ok written sectors
Pierre Ossman23af6032008-07-06 01:10:27 +0200345 * as reported by the controller (which might be less than
346 * the real number of written sectors, but never more).
Pierre Ossman176f00f2006-10-04 02:15:41 -0700347 *
348 * For reads we just fail the entire chunk as that should
349 * be safe in all cases.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 */
Pierre Ossman23af6032008-07-06 01:10:27 +0200351 if (rq_data_dir(req) != READ) {
352 if (mmc_card_sd(card)) {
353 u32 blocks;
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700354
Pierre Ossman23af6032008-07-06 01:10:27 +0200355 blocks = mmc_sd_num_wr_blocks(card);
356 if (blocks != (u32)-1) {
Pierre Ossman23af6032008-07-06 01:10:27 +0200357 spin_lock_irq(&md->lock);
Pierre Ossman08846692008-08-31 14:10:08 +0200358 ret = __blk_end_request(req, 0, blocks << 9);
Pierre Ossman23af6032008-07-06 01:10:27 +0200359 spin_unlock_irq(&md->lock);
360 }
361 } else {
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700362 spin_lock_irq(&md->lock);
Pierre Ossman23af6032008-07-06 01:10:27 +0200363 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700364 spin_unlock_irq(&md->lock);
365 }
Pierre Ossman176f00f2006-10-04 02:15:41 -0700366 }
367
Pierre Ossmanb8558852007-01-03 19:47:29 +0100368 mmc_release_host(card->host);
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700369
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 spin_lock_irq(&md->lock);
Kiyoshi Uedafd539832007-12-11 17:48:29 -0500371 while (ret)
372 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 spin_unlock_irq(&md->lock);
374
375 return 0;
376}
377
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Russell Kinga6f6c962006-01-03 22:38:44 +0000379static inline int mmc_blk_readonly(struct mmc_card *card)
380{
381 return mmc_card_readonly(card) ||
382 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
383}
384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
386{
387 struct mmc_blk_data *md;
388 int devidx, ret;
389
390 devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
391 if (devidx >= MMC_NUM_MINORS)
392 return ERR_PTR(-ENOSPC);
393 __set_bit(devidx, dev_use);
394
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700395 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
Russell Kinga6f6c962006-01-03 22:38:44 +0000396 if (!md) {
397 ret = -ENOMEM;
398 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 }
Russell Kinga6f6c962006-01-03 22:38:44 +0000400
Russell Kinga6f6c962006-01-03 22:38:44 +0000401
402 /*
403 * Set the read-only status based on the supported commands
404 * and the write protect switch.
405 */
406 md->read_only = mmc_blk_readonly(card);
407
Russell Kinga6f6c962006-01-03 22:38:44 +0000408 md->disk = alloc_disk(1 << MMC_SHIFT);
409 if (md->disk == NULL) {
410 ret = -ENOMEM;
411 goto err_kfree;
412 }
413
414 spin_lock_init(&md->lock);
415 md->usage = 1;
416
417 ret = mmc_init_queue(&md->queue, card, &md->lock);
418 if (ret)
419 goto err_putdisk;
420
Russell Kinga6f6c962006-01-03 22:38:44 +0000421 md->queue.issue_fn = mmc_blk_issue_rq;
422 md->queue.data = md;
423
Pierre Ossmanfe6b4c82007-05-14 17:27:29 +0200424 md->disk->major = MMC_BLOCK_MAJOR;
Russell Kinga6f6c962006-01-03 22:38:44 +0000425 md->disk->first_minor = devidx << MMC_SHIFT;
426 md->disk->fops = &mmc_bdops;
427 md->disk->private_data = md;
428 md->disk->queue = md->queue.queue;
429 md->disk->driverfs_dev = &card->dev;
430
431 /*
432 * As discussed on lkml, GENHD_FL_REMOVABLE should:
433 *
434 * - be set for removable media with permanent block devices
435 * - be unset for removable block devices with permanent media
436 *
437 * Since MMC block devices clearly fall under the second
438 * case, we do not set GENHD_FL_REMOVABLE. Userspace
439 * should use the block device creation/destruction hotplug
440 * messages to tell when the card is present.
441 */
442
443 sprintf(md->disk->disk_name, "mmcblk%d", devidx);
Russell Kinga6f6c962006-01-03 22:38:44 +0000444
Pierre Ossman08846692008-08-31 14:10:08 +0200445 blk_queue_hardsect_size(md->queue.queue, 512);
Russell Kinga6f6c962006-01-03 22:38:44 +0000446
Pierre Ossman85a18ad2007-02-17 22:15:27 +0100447 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
448 /*
449 * The EXT_CSD sector count is in number or 512 byte
450 * sectors.
451 */
452 set_capacity(md->disk, card->ext_csd.sectors);
453 } else {
454 /*
455 * The CSD capacity field is in units of read_blkbits.
456 * set_capacity takes units of 512 bytes.
457 */
458 set_capacity(md->disk,
459 card->csd.capacity << (card->csd.read_blkbits - 9));
460 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 return md;
Russell Kinga6f6c962006-01-03 22:38:44 +0000462
463 err_putdisk:
464 put_disk(md->disk);
465 err_kfree:
466 kfree(md);
467 out:
468 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469}
470
471static int
472mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
473{
474 struct mmc_command cmd;
475 int err;
476
Philip Langdalefba68bd2007-01-04 06:57:32 -0800477 /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
478 if (mmc_card_blockaddr(card))
479 return 0;
480
Pierre Ossmanb8558852007-01-03 19:47:29 +0100481 mmc_claim_host(card->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 cmd.opcode = MMC_SET_BLOCKLEN;
Pierre Ossman08846692008-08-31 14:10:08 +0200483 cmd.arg = 512;
David Brownell7213d172007-08-08 09:10:23 -0700484 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 err = mmc_wait_for_cmd(card->host, &cmd, 5);
Pierre Ossmanb8558852007-01-03 19:47:29 +0100486 mmc_release_host(card->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
488 if (err) {
489 printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
490 md->disk->disk_name, cmd.arg, err);
491 return -EINVAL;
492 }
493
494 return 0;
495}
496
497static int mmc_blk_probe(struct mmc_card *card)
498{
499 struct mmc_blk_data *md;
500 int err;
501
Pierre Ossmana7bbb572008-09-06 10:57:57 +0200502 char cap_str[10];
503
Pierre Ossman912490d2005-05-21 10:27:02 +0100504 /*
505 * Check that the card supports the command class(es) we need.
506 */
507 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 return -ENODEV;
509
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 md = mmc_blk_alloc(card);
511 if (IS_ERR(md))
512 return PTR_ERR(md);
513
514 err = mmc_blk_set_blksize(md, card);
515 if (err)
516 goto out;
517
Pierre Ossmana7bbb572008-09-06 10:57:57 +0200518 string_get_size(get_capacity(md->disk) << 9, STRING_UNITS_2,
519 cap_str, sizeof(cap_str));
520 printk(KERN_INFO "%s: %s %s %s %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
Pierre Ossmana7bbb572008-09-06 10:57:57 +0200522 cap_str, md->read_only ? "(ro)" : "");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
524 mmc_set_drvdata(card, md);
525 add_disk(md->disk);
526 return 0;
527
528 out:
529 mmc_blk_put(md);
530
531 return err;
532}
533
534static void mmc_blk_remove(struct mmc_card *card)
535{
536 struct mmc_blk_data *md = mmc_get_drvdata(card);
537
538 if (md) {
Pierre Ossman89b4e132006-11-14 22:08:16 +0100539 /* Stop new requests from getting into the queue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 del_gendisk(md->disk);
541
Pierre Ossman89b4e132006-11-14 22:08:16 +0100542 /* Then flush out any already in there */
543 mmc_cleanup_queue(&md->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 mmc_blk_put(md);
546 }
547 mmc_set_drvdata(card, NULL);
548}
549
550#ifdef CONFIG_PM
551static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
552{
553 struct mmc_blk_data *md = mmc_get_drvdata(card);
554
555 if (md) {
556 mmc_queue_suspend(&md->queue);
557 }
558 return 0;
559}
560
561static int mmc_blk_resume(struct mmc_card *card)
562{
563 struct mmc_blk_data *md = mmc_get_drvdata(card);
564
565 if (md) {
566 mmc_blk_set_blksize(md, card);
567 mmc_queue_resume(&md->queue);
568 }
569 return 0;
570}
571#else
572#define mmc_blk_suspend NULL
573#define mmc_blk_resume NULL
574#endif
575
576static struct mmc_driver mmc_driver = {
577 .drv = {
578 .name = "mmcblk",
579 },
580 .probe = mmc_blk_probe,
581 .remove = mmc_blk_remove,
582 .suspend = mmc_blk_suspend,
583 .resume = mmc_blk_resume,
584};
585
586static int __init mmc_blk_init(void)
587{
Akinobu Mita9d4e98e2008-09-13 19:02:07 +0900588 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
Pierre Ossmanfe6b4c82007-05-14 17:27:29 +0200590 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
591 if (res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Akinobu Mita9d4e98e2008-09-13 19:02:07 +0900594 res = mmc_register_driver(&mmc_driver);
595 if (res)
596 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
Akinobu Mita9d4e98e2008-09-13 19:02:07 +0900598 return 0;
599 out2:
600 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 out:
602 return res;
603}
604
605static void __exit mmc_blk_exit(void)
606{
607 mmc_unregister_driver(&mmc_driver);
Pierre Ossmanfe6b4c82007-05-14 17:27:29 +0200608 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609}
610
611module_init(mmc_blk_init);
612module_exit(mmc_blk_exit);
613
614MODULE_LICENSE("GPL");
615MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
616