blob: d545f79f6000ebe8b5219c56a19c7bd0acbfc343 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/errno.h>
28#include <linux/hdreg.h>
29#include <linux/kdev_t.h>
30#include <linux/blkdev.h>
Arjan van de Vena621aae2006-01-12 18:43:35 +000031#include <linux/mutex.h>
Arnd Bergmann6e9624b2010-08-07 18:25:34 +020032#include <linux/smp_lock.h>
Pierre Ossmanec5a19d2006-10-06 00:44:03 -070033#include <linux/scatterlist.h>
Pierre Ossmana7bbb572008-09-06 10:57:57 +020034#include <linux/string_helpers.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#include <linux/mmc/card.h>
Pierre Ossman385e32272006-06-18 14:34:37 +020037#include <linux/mmc/host.h>
Pierre Ossmanda7fbe52006-12-24 22:46:55 +010038#include <linux/mmc/mmc.h>
39#include <linux/mmc/sd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#include <asm/system.h>
42#include <asm/uaccess.h>
43
Pierre Ossman98ac2162006-12-23 20:03:02 +010044#include "queue.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Andy Whitcroft6b0b6282009-02-23 12:38:41 +000046MODULE_ALIAS("mmc:block");
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048/*
49 * max 8 partitions per card
50 */
51#define MMC_SHIFT 3
David Woodhouse1dff3142007-11-21 18:45:12 +010052#define MMC_NUM_MINORS (256 >> MMC_SHIFT)
53
Ben Collins203c8012008-06-05 19:10:21 -040054static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Linus Torvalds1da177e2005-04-16 15:20:36 -070056/*
57 * There is one mmc_blk_data per slot.
58 */
59struct mmc_blk_data {
60 spinlock_t lock;
61 struct gendisk *disk;
62 struct mmc_queue queue;
63
64 unsigned int usage;
Russell Kinga6f6c962006-01-03 22:38:44 +000065 unsigned int read_only;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066};
67
Arjan van de Vena621aae2006-01-12 18:43:35 +000068static DEFINE_MUTEX(open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
71{
72 struct mmc_blk_data *md;
73
Arjan van de Vena621aae2006-01-12 18:43:35 +000074 mutex_lock(&open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 md = disk->private_data;
76 if (md && md->usage == 0)
77 md = NULL;
78 if (md)
79 md->usage++;
Arjan van de Vena621aae2006-01-12 18:43:35 +000080 mutex_unlock(&open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82 return md;
83}
84
85static void mmc_blk_put(struct mmc_blk_data *md)
86{
Arjan van de Vena621aae2006-01-12 18:43:35 +000087 mutex_lock(&open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 md->usage--;
89 if (md->usage == 0) {
Anna Lemehova7d92df62010-01-08 14:42:58 -080090 int devmaj = MAJOR(disk_devt(md->disk));
Tejun Heof331c022008-09-03 09:01:48 +020091 int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT;
Anna Lemehova7d92df62010-01-08 14:42:58 -080092
93 if (!devmaj)
94 devidx = md->disk->first_minor >> MMC_SHIFT;
95
Adrian Hunter5fa83ce2010-01-08 14:43:00 -080096 blk_cleanup_queue(md->queue.queue);
97
David Woodhouse1dff3142007-11-21 18:45:12 +010098 __clear_bit(devidx, dev_use);
99
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 put_disk(md->disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 kfree(md);
102 }
Arjan van de Vena621aae2006-01-12 18:43:35 +0000103 mutex_unlock(&open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}
105
Al Viroa5a15612008-03-02 10:33:30 -0500106static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107{
Al Viroa5a15612008-03-02 10:33:30 -0500108 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 int ret = -ENXIO;
110
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200111 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 if (md) {
113 if (md->usage == 2)
Al Viroa5a15612008-03-02 10:33:30 -0500114 check_disk_change(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 ret = 0;
Pierre Ossmana00fc092005-09-06 15:18:52 -0700116
Al Viroa5a15612008-03-02 10:33:30 -0500117 if ((mode & FMODE_WRITE) && md->read_only) {
Andrew Morton70bb0892008-09-05 14:00:24 -0700118 mmc_blk_put(md);
Pierre Ossmana00fc092005-09-06 15:18:52 -0700119 ret = -EROFS;
Andrew Morton70bb0892008-09-05 14:00:24 -0700120 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 }
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200122 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124 return ret;
125}
126
Al Viroa5a15612008-03-02 10:33:30 -0500127static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128{
Al Viroa5a15612008-03-02 10:33:30 -0500129 struct mmc_blk_data *md = disk->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200131 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 mmc_blk_put(md);
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200133 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 return 0;
135}
136
137static int
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800138mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139{
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800140 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
141 geo->heads = 4;
142 geo->sectors = 16;
143 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144}
145
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700146static const struct block_device_operations mmc_bdops = {
Al Viroa5a15612008-03-02 10:33:30 -0500147 .open = mmc_blk_open,
148 .release = mmc_blk_release,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800149 .getgeo = mmc_blk_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 .owner = THIS_MODULE,
151};
152
153struct mmc_blk_request {
154 struct mmc_request mrq;
155 struct mmc_command cmd;
156 struct mmc_command stop;
157 struct mmc_data data;
158};
159
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700160static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
161{
162 int err;
Ben Dooks051913d2009-06-08 23:33:57 +0100163 u32 result;
164 __be32 *blocks;
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700165
166 struct mmc_request mrq;
167 struct mmc_command cmd;
168 struct mmc_data data;
169 unsigned int timeout_us;
170
171 struct scatterlist sg;
172
173 memset(&cmd, 0, sizeof(struct mmc_command));
174
175 cmd.opcode = MMC_APP_CMD;
176 cmd.arg = card->rca << 16;
David Brownell7213d172007-08-08 09:10:23 -0700177 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700178
179 err = mmc_wait_for_cmd(card->host, &cmd, 0);
David Brownell7213d172007-08-08 09:10:23 -0700180 if (err)
181 return (u32)-1;
182 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700183 return (u32)-1;
184
185 memset(&cmd, 0, sizeof(struct mmc_command));
186
187 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
188 cmd.arg = 0;
David Brownell7213d172007-08-08 09:10:23 -0700189 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700190
191 memset(&data, 0, sizeof(struct mmc_data));
192
193 data.timeout_ns = card->csd.tacc_ns * 100;
194 data.timeout_clks = card->csd.tacc_clks * 100;
195
196 timeout_us = data.timeout_ns / 1000;
197 timeout_us += data.timeout_clks * 1000 /
198 (card->host->ios.clock / 1000);
199
200 if (timeout_us > 100000) {
201 data.timeout_ns = 100000000;
202 data.timeout_clks = 0;
203 }
204
205 data.blksz = 4;
206 data.blocks = 1;
207 data.flags = MMC_DATA_READ;
208 data.sg = &sg;
209 data.sg_len = 1;
210
211 memset(&mrq, 0, sizeof(struct mmc_request));
212
213 mrq.cmd = &cmd;
214 mrq.data = &data;
215
Ben Dooks051913d2009-06-08 23:33:57 +0100216 blocks = kmalloc(4, GFP_KERNEL);
217 if (!blocks)
218 return (u32)-1;
219
220 sg_init_one(&sg, blocks, 4);
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700221
222 mmc_wait_for_req(card->host, &mrq);
223
Ben Dooks051913d2009-06-08 23:33:57 +0100224 result = ntohl(*blocks);
225 kfree(blocks);
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700226
Ben Dooks051913d2009-06-08 23:33:57 +0100227 if (cmd.error || data.error)
228 result = (u32)-1;
229
230 return result;
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700231}
232
Adrian Hunter504f1912008-10-16 12:55:25 +0300233static u32 get_card_status(struct mmc_card *card, struct request *req)
234{
235 struct mmc_command cmd;
236 int err;
237
238 memset(&cmd, 0, sizeof(struct mmc_command));
239 cmd.opcode = MMC_SEND_STATUS;
240 if (!mmc_host_is_spi(card->host))
241 cmd.arg = card->rca << 16;
242 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
243 err = mmc_wait_for_cmd(card->host, &cmd, 0);
244 if (err)
245 printk(KERN_ERR "%s: error %d sending status comand",
246 req->rq_disk->disk_name, err);
247 return cmd.resp[0];
248}
249
Adrian Hunterbd788c92010-08-11 14:17:47 -0700250static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
251{
252 struct mmc_blk_data *md = mq->data;
253 struct mmc_card *card = md->queue.card;
254 unsigned int from, nr, arg;
255 int err = 0;
256
257 mmc_claim_host(card->host);
258
259 if (!mmc_can_erase(card)) {
260 err = -EOPNOTSUPP;
261 goto out;
262 }
263
264 from = blk_rq_pos(req);
265 nr = blk_rq_sectors(req);
266
267 if (mmc_can_trim(card))
268 arg = MMC_TRIM_ARG;
269 else
270 arg = MMC_ERASE_ARG;
271
272 err = mmc_erase(card, from, nr, arg);
273out:
274 spin_lock_irq(&md->lock);
275 __blk_end_request(req, err, blk_rq_bytes(req));
276 spin_unlock_irq(&md->lock);
277
278 mmc_release_host(card->host);
279
280 return err ? 0 : 1;
281}
282
Adrian Hunter49804542010-08-11 14:17:50 -0700283static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
284 struct request *req)
285{
286 struct mmc_blk_data *md = mq->data;
287 struct mmc_card *card = md->queue.card;
288 unsigned int from, nr, arg;
289 int err = 0;
290
291 mmc_claim_host(card->host);
292
293 if (!mmc_can_secure_erase_trim(card)) {
294 err = -EOPNOTSUPP;
295 goto out;
296 }
297
298 from = blk_rq_pos(req);
299 nr = blk_rq_sectors(req);
300
301 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
302 arg = MMC_SECURE_TRIM1_ARG;
303 else
304 arg = MMC_SECURE_ERASE_ARG;
305
306 err = mmc_erase(card, from, nr, arg);
307 if (!err && arg == MMC_SECURE_TRIM1_ARG)
308 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
309out:
310 spin_lock_irq(&md->lock);
311 __blk_end_request(req, err, blk_rq_bytes(req));
312 spin_unlock_irq(&md->lock);
313
314 mmc_release_host(card->host);
315
316 return err ? 0 : 1;
317}
318
Adrian Hunterbd788c92010-08-11 14:17:47 -0700319static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
321 struct mmc_blk_data *md = mq->data;
322 struct mmc_card *card = md->queue.card;
Pierre Ossman176f00f2006-10-04 02:15:41 -0700323 struct mmc_blk_request brq;
Adrian Hunter6a79e392008-12-31 18:21:17 +0100324 int ret = 1, disable_multi = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
Pierre Ossmanb8558852007-01-03 19:47:29 +0100326 mmc_claim_host(card->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 struct mmc_command cmd;
Adrian Hunter504f1912008-10-16 12:55:25 +0300330 u32 readcmd, writecmd, status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
332 memset(&brq, 0, sizeof(struct mmc_blk_request));
333 brq.mrq.cmd = &brq.cmd;
334 brq.mrq.data = &brq.data;
335
Tejun Heo83096eb2009-05-07 22:24:39 +0900336 brq.cmd.arg = blk_rq_pos(req);
Philip Langdalefba68bd2007-01-04 06:57:32 -0800337 if (!mmc_card_blockaddr(card))
338 brq.cmd.arg <<= 9;
David Brownell7213d172007-08-08 09:10:23 -0700339 brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
Pierre Ossman08846692008-08-31 14:10:08 +0200340 brq.data.blksz = 512;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 brq.stop.opcode = MMC_STOP_TRANSMISSION;
342 brq.stop.arg = 0;
David Brownell7213d172007-08-08 09:10:23 -0700343 brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
Tejun Heo83096eb2009-05-07 22:24:39 +0900344 brq.data.blocks = blk_rq_sectors(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
Adrian Hunter6a79e392008-12-31 18:21:17 +0100346 /*
Pierre Ossman548d2de2009-04-10 17:52:57 +0200347 * The block layer doesn't support all sector count
348 * restrictions, so we need to be prepared for too big
349 * requests.
350 */
351 if (brq.data.blocks > card->host->max_blk_count)
352 brq.data.blocks = card->host->max_blk_count;
353
354 /*
Adrian Hunter6a79e392008-12-31 18:21:17 +0100355 * After a read error, we redo the request one sector at a time
356 * in order to accurately determine which sectors can be read
357 * successfully.
358 */
359 if (disable_multi && brq.data.blocks > 1)
360 brq.data.blocks = 1;
361
Russell King788ee7b2006-01-09 21:12:17 +0000362 if (brq.data.blocks > 1) {
David Brownell7213d172007-08-08 09:10:23 -0700363 /* SPI multiblock writes terminate using a special
364 * token, not a STOP_TRANSMISSION request.
365 */
366 if (!mmc_host_is_spi(card->host)
367 || rq_data_dir(req) == READ)
368 brq.mrq.stop = &brq.stop;
Russell Kingdb53f282006-08-30 15:14:56 +0100369 readcmd = MMC_READ_MULTIPLE_BLOCK;
370 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
Russell King788ee7b2006-01-09 21:12:17 +0000371 } else {
372 brq.mrq.stop = NULL;
Russell Kingdb53f282006-08-30 15:14:56 +0100373 readcmd = MMC_READ_SINGLE_BLOCK;
374 writecmd = MMC_WRITE_BLOCK;
375 }
376
377 if (rq_data_dir(req) == READ) {
378 brq.cmd.opcode = readcmd;
379 brq.data.flags |= MMC_DATA_READ;
380 } else {
381 brq.cmd.opcode = writecmd;
382 brq.data.flags |= MMC_DATA_WRITE;
Russell King788ee7b2006-01-09 21:12:17 +0000383 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
Pierre Ossmanb146d262007-07-24 19:16:54 +0200385 mmc_set_data_timeout(&brq.data, card);
386
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 brq.data.sg = mq->sg;
Pierre Ossman98ccf142007-05-12 00:26:16 +0200388 brq.data.sg_len = mmc_queue_map_sg(mq);
389
Adrian Hunter6a79e392008-12-31 18:21:17 +0100390 /*
391 * Adjust the sg list so it is the same size as the
392 * request.
393 */
Tejun Heo83096eb2009-05-07 22:24:39 +0900394 if (brq.data.blocks != blk_rq_sectors(req)) {
Adrian Hunter6a79e392008-12-31 18:21:17 +0100395 int i, data_size = brq.data.blocks << 9;
396 struct scatterlist *sg;
397
398 for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) {
399 data_size -= sg->length;
400 if (data_size <= 0) {
401 sg->length += data_size;
402 i++;
403 break;
404 }
405 }
406 brq.data.sg_len = i;
407 }
408
Pierre Ossman98ccf142007-05-12 00:26:16 +0200409 mmc_queue_bounce_pre(mq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
411 mmc_wait_for_req(card->host, &brq.mrq);
Pierre Ossman98ccf142007-05-12 00:26:16 +0200412
413 mmc_queue_bounce_post(mq);
414
Pierre Ossman979ce722008-06-29 12:19:47 +0200415 /*
416 * Check for errors here, but don't jump to cmd_err
417 * until later as we need to wait for the card to leave
418 * programming mode even when things go wrong.
419 */
Adrian Hunter6a79e392008-12-31 18:21:17 +0100420 if (brq.cmd.error || brq.data.error || brq.stop.error) {
421 if (brq.data.blocks > 1 && rq_data_dir(req) == READ) {
422 /* Redo read one sector at a time */
423 printk(KERN_WARNING "%s: retrying using single "
424 "block read\n", req->rq_disk->disk_name);
425 disable_multi = 1;
426 continue;
427 }
Adrian Hunter504f1912008-10-16 12:55:25 +0300428 status = get_card_status(card, req);
Adrian Hunter6a79e392008-12-31 18:21:17 +0100429 }
Adrian Hunter504f1912008-10-16 12:55:25 +0300430
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 if (brq.cmd.error) {
Adrian Hunter504f1912008-10-16 12:55:25 +0300432 printk(KERN_ERR "%s: error %d sending read/write "
433 "command, response %#x, card status %#x\n",
434 req->rq_disk->disk_name, brq.cmd.error,
435 brq.cmd.resp[0], status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 }
437
438 if (brq.data.error) {
Adrian Hunter504f1912008-10-16 12:55:25 +0300439 if (brq.data.error == -ETIMEDOUT && brq.mrq.stop)
440 /* 'Stop' response contains card status */
441 status = brq.mrq.stop->resp[0];
442 printk(KERN_ERR "%s: error %d transferring data,"
443 " sector %u, nr %u, card status %#x\n",
444 req->rq_disk->disk_name, brq.data.error,
Tejun Heo83096eb2009-05-07 22:24:39 +0900445 (unsigned)blk_rq_pos(req),
446 (unsigned)blk_rq_sectors(req), status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 }
448
449 if (brq.stop.error) {
Adrian Hunter504f1912008-10-16 12:55:25 +0300450 printk(KERN_ERR "%s: error %d sending stop command, "
451 "response %#x, card status %#x\n",
452 req->rq_disk->disk_name, brq.stop.error,
453 brq.stop.resp[0], status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 }
455
David Brownell7213d172007-08-08 09:10:23 -0700456 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
Russell King2ed6d222006-09-24 10:46:43 +0100457 do {
458 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
Russell King2ed6d222006-09-24 10:46:43 +0100460 cmd.opcode = MMC_SEND_STATUS;
461 cmd.arg = card->rca << 16;
462 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
463 err = mmc_wait_for_cmd(card->host, &cmd, 5);
464 if (err) {
465 printk(KERN_ERR "%s: error %d requesting status\n",
466 req->rq_disk->disk_name, err);
467 goto cmd_err;
468 }
Pierre Ossmand198f102007-11-02 18:21:13 +0100469 /*
470 * Some cards mishandle the status bits,
471 * so make sure to check both the busy
472 * indication and the card state.
473 */
474 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
475 (R1_CURRENT_STATE(cmd.resp[0]) == 7));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
477#if 0
Russell King2ed6d222006-09-24 10:46:43 +0100478 if (cmd.resp[0] & ~0x00000900)
479 printk(KERN_ERR "%s: status = %08x\n",
480 req->rq_disk->disk_name, cmd.resp[0]);
481 if (mmc_decode_status(cmd.resp))
482 goto cmd_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483#endif
Russell King2ed6d222006-09-24 10:46:43 +0100484 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Adrian Hunter6a79e392008-12-31 18:21:17 +0100486 if (brq.cmd.error || brq.stop.error || brq.data.error) {
487 if (rq_data_dir(req) == READ) {
488 /*
489 * After an error, we redo I/O one sector at a
490 * time, so we only reach here after trying to
491 * read a single sector.
492 */
493 spin_lock_irq(&md->lock);
494 ret = __blk_end_request(req, -EIO, brq.data.blksz);
495 spin_unlock_irq(&md->lock);
496 continue;
497 }
Pierre Ossman979ce722008-06-29 12:19:47 +0200498 goto cmd_err;
Adrian Hunter6a79e392008-12-31 18:21:17 +0100499 }
Pierre Ossman979ce722008-06-29 12:19:47 +0200500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 /*
502 * A block was successfully transferred.
503 */
504 spin_lock_irq(&md->lock);
Kiyoshi Uedafd539832007-12-11 17:48:29 -0500505 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 spin_unlock_irq(&md->lock);
507 } while (ret);
508
Pierre Ossmanb8558852007-01-03 19:47:29 +0100509 mmc_release_host(card->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
511 return 1;
512
513 cmd_err:
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700514 /*
515 * If this is an SD card and we're writing, we can first
516 * mark the known good sectors as ok.
517 *
518 * If the card is not SD, we can still ok written sectors
Pierre Ossman23af6032008-07-06 01:10:27 +0200519 * as reported by the controller (which might be less than
520 * the real number of written sectors, but never more).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 */
Adrian Hunter6a79e392008-12-31 18:21:17 +0100522 if (mmc_card_sd(card)) {
523 u32 blocks;
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700524
Adrian Hunter6a79e392008-12-31 18:21:17 +0100525 blocks = mmc_sd_num_wr_blocks(card);
526 if (blocks != (u32)-1) {
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700527 spin_lock_irq(&md->lock);
Adrian Hunter6a79e392008-12-31 18:21:17 +0100528 ret = __blk_end_request(req, 0, blocks << 9);
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700529 spin_unlock_irq(&md->lock);
530 }
Adrian Hunter6a79e392008-12-31 18:21:17 +0100531 } else {
532 spin_lock_irq(&md->lock);
533 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
534 spin_unlock_irq(&md->lock);
Pierre Ossman176f00f2006-10-04 02:15:41 -0700535 }
536
Pierre Ossmanb8558852007-01-03 19:47:29 +0100537 mmc_release_host(card->host);
Pierre Ossmanec5a19d2006-10-06 00:44:03 -0700538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 spin_lock_irq(&md->lock);
Kiyoshi Uedafd539832007-12-11 17:48:29 -0500540 while (ret)
541 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 spin_unlock_irq(&md->lock);
543
544 return 0;
545}
546
Adrian Hunterbd788c92010-08-11 14:17:47 -0700547static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
548{
Adrian Hunter49804542010-08-11 14:17:50 -0700549 if (req->cmd_flags & REQ_DISCARD) {
550 if (req->cmd_flags & REQ_SECURE)
551 return mmc_blk_issue_secdiscard_rq(mq, req);
552 else
553 return mmc_blk_issue_discard_rq(mq, req);
554 } else {
Adrian Hunterbd788c92010-08-11 14:17:47 -0700555 return mmc_blk_issue_rw_rq(mq, req);
Adrian Hunter49804542010-08-11 14:17:50 -0700556 }
Adrian Hunterbd788c92010-08-11 14:17:47 -0700557}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Russell Kinga6f6c962006-01-03 22:38:44 +0000559static inline int mmc_blk_readonly(struct mmc_card *card)
560{
561 return mmc_card_readonly(card) ||
562 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
563}
564
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
566{
567 struct mmc_blk_data *md;
568 int devidx, ret;
569
570 devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
571 if (devidx >= MMC_NUM_MINORS)
572 return ERR_PTR(-ENOSPC);
573 __set_bit(devidx, dev_use);
574
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700575 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
Russell Kinga6f6c962006-01-03 22:38:44 +0000576 if (!md) {
577 ret = -ENOMEM;
578 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 }
Russell Kinga6f6c962006-01-03 22:38:44 +0000580
Russell Kinga6f6c962006-01-03 22:38:44 +0000581
582 /*
583 * Set the read-only status based on the supported commands
584 * and the write protect switch.
585 */
586 md->read_only = mmc_blk_readonly(card);
587
Russell Kinga6f6c962006-01-03 22:38:44 +0000588 md->disk = alloc_disk(1 << MMC_SHIFT);
589 if (md->disk == NULL) {
590 ret = -ENOMEM;
591 goto err_kfree;
592 }
593
594 spin_lock_init(&md->lock);
595 md->usage = 1;
596
597 ret = mmc_init_queue(&md->queue, card, &md->lock);
598 if (ret)
599 goto err_putdisk;
600
Russell Kinga6f6c962006-01-03 22:38:44 +0000601 md->queue.issue_fn = mmc_blk_issue_rq;
602 md->queue.data = md;
603
Pierre Ossmanfe6b4c82007-05-14 17:27:29 +0200604 md->disk->major = MMC_BLOCK_MAJOR;
Russell Kinga6f6c962006-01-03 22:38:44 +0000605 md->disk->first_minor = devidx << MMC_SHIFT;
606 md->disk->fops = &mmc_bdops;
607 md->disk->private_data = md;
608 md->disk->queue = md->queue.queue;
609 md->disk->driverfs_dev = &card->dev;
610
611 /*
612 * As discussed on lkml, GENHD_FL_REMOVABLE should:
613 *
614 * - be set for removable media with permanent block devices
615 * - be unset for removable block devices with permanent media
616 *
617 * Since MMC block devices clearly fall under the second
618 * case, we do not set GENHD_FL_REMOVABLE. Userspace
619 * should use the block device creation/destruction hotplug
620 * messages to tell when the card is present.
621 */
622
623 sprintf(md->disk->disk_name, "mmcblk%d", devidx);
Russell Kinga6f6c962006-01-03 22:38:44 +0000624
Martin K. Petersene1defc42009-05-22 17:17:49 -0400625 blk_queue_logical_block_size(md->queue.queue, 512);
Russell Kinga6f6c962006-01-03 22:38:44 +0000626
Pierre Ossman85a18ad2007-02-17 22:15:27 +0100627 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
628 /*
629 * The EXT_CSD sector count is in number or 512 byte
630 * sectors.
631 */
632 set_capacity(md->disk, card->ext_csd.sectors);
633 } else {
634 /*
635 * The CSD capacity field is in units of read_blkbits.
636 * set_capacity takes units of 512 bytes.
637 */
638 set_capacity(md->disk,
639 card->csd.capacity << (card->csd.read_blkbits - 9));
640 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 return md;
Russell Kinga6f6c962006-01-03 22:38:44 +0000642
643 err_putdisk:
644 put_disk(md->disk);
645 err_kfree:
646 kfree(md);
647 out:
648 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649}
650
651static int
652mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
653{
654 struct mmc_command cmd;
655 int err;
656
Philip Langdalefba68bd2007-01-04 06:57:32 -0800657 /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
658 if (mmc_card_blockaddr(card))
659 return 0;
660
Pierre Ossmanb8558852007-01-03 19:47:29 +0100661 mmc_claim_host(card->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 cmd.opcode = MMC_SET_BLOCKLEN;
Pierre Ossman08846692008-08-31 14:10:08 +0200663 cmd.arg = 512;
David Brownell7213d172007-08-08 09:10:23 -0700664 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 err = mmc_wait_for_cmd(card->host, &cmd, 5);
Pierre Ossmanb8558852007-01-03 19:47:29 +0100666 mmc_release_host(card->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
668 if (err) {
669 printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
670 md->disk->disk_name, cmd.arg, err);
671 return -EINVAL;
672 }
673
674 return 0;
675}
676
677static int mmc_blk_probe(struct mmc_card *card)
678{
679 struct mmc_blk_data *md;
680 int err;
681
Pierre Ossmana7bbb572008-09-06 10:57:57 +0200682 char cap_str[10];
683
Pierre Ossman912490d2005-05-21 10:27:02 +0100684 /*
685 * Check that the card supports the command class(es) we need.
686 */
687 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 return -ENODEV;
689
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 md = mmc_blk_alloc(card);
691 if (IS_ERR(md))
692 return PTR_ERR(md);
693
694 err = mmc_blk_set_blksize(md, card);
695 if (err)
696 goto out;
697
Yi Li444122f2009-02-05 15:31:57 +0800698 string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
Pierre Ossmana7bbb572008-09-06 10:57:57 +0200699 cap_str, sizeof(cap_str));
700 printk(KERN_INFO "%s: %s %s %s %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
Pierre Ossmana7bbb572008-09-06 10:57:57 +0200702 cap_str, md->read_only ? "(ro)" : "");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
704 mmc_set_drvdata(card, md);
705 add_disk(md->disk);
706 return 0;
707
708 out:
Jarkko Lavinen0a74ff22010-01-08 14:42:59 -0800709 mmc_cleanup_queue(&md->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 mmc_blk_put(md);
711
712 return err;
713}
714
715static void mmc_blk_remove(struct mmc_card *card)
716{
717 struct mmc_blk_data *md = mmc_get_drvdata(card);
718
719 if (md) {
Pierre Ossman89b4e132006-11-14 22:08:16 +0100720 /* Stop new requests from getting into the queue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 del_gendisk(md->disk);
722
Pierre Ossman89b4e132006-11-14 22:08:16 +0100723 /* Then flush out any already in there */
724 mmc_cleanup_queue(&md->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 mmc_blk_put(md);
727 }
728 mmc_set_drvdata(card, NULL);
729}
730
731#ifdef CONFIG_PM
732static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
733{
734 struct mmc_blk_data *md = mmc_get_drvdata(card);
735
736 if (md) {
737 mmc_queue_suspend(&md->queue);
738 }
739 return 0;
740}
741
742static int mmc_blk_resume(struct mmc_card *card)
743{
744 struct mmc_blk_data *md = mmc_get_drvdata(card);
745
746 if (md) {
747 mmc_blk_set_blksize(md, card);
748 mmc_queue_resume(&md->queue);
749 }
750 return 0;
751}
752#else
753#define mmc_blk_suspend NULL
754#define mmc_blk_resume NULL
755#endif
756
757static struct mmc_driver mmc_driver = {
758 .drv = {
759 .name = "mmcblk",
760 },
761 .probe = mmc_blk_probe,
762 .remove = mmc_blk_remove,
763 .suspend = mmc_blk_suspend,
764 .resume = mmc_blk_resume,
765};
766
767static int __init mmc_blk_init(void)
768{
Akinobu Mita9d4e98e2008-09-13 19:02:07 +0900769 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Pierre Ossmanfe6b4c82007-05-14 17:27:29 +0200771 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
772 if (res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
Akinobu Mita9d4e98e2008-09-13 19:02:07 +0900775 res = mmc_register_driver(&mmc_driver);
776 if (res)
777 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
Akinobu Mita9d4e98e2008-09-13 19:02:07 +0900779 return 0;
780 out2:
781 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 out:
783 return res;
784}
785
786static void __exit mmc_blk_exit(void)
787{
788 mmc_unregister_driver(&mmc_driver);
Pierre Ossmanfe6b4c82007-05-14 17:27:29 +0200789 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790}
791
792module_init(mmc_blk_init);
793module_exit(mmc_blk_exit);
794
795MODULE_LICENSE("GPL");
796MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
797