2 * Block driver for media (i.e., flash cards)
4 * Copyright 2002 Hewlett-Packard Company
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.
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.
14 * Many thanks to Alessandro Rubini and Jonathan Corbet!
16 * Author: Andrew Christian
19 #include <linux/moduleparam.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
23 #include <linux/sched.h>
24 #include <linux/kernel.h>
26 #include <linux/errno.h>
27 #include <linux/hdreg.h>
28 #include <linux/kdev_t.h>
29 #include <linux/blkdev.h>
30 #include <linux/devfs_fs_kernel.h>
32 #include <linux/mmc/card.h>
33 #include <linux/mmc/protocol.h>
35 #include <asm/system.h>
36 #include <asm/uaccess.h>
38 #include "mmc_queue.h"
41 * max 8 partitions per card
48 * There is one mmc_blk_data per slot.
53 struct mmc_queue queue
;
56 unsigned int block_bits
;
59 static DECLARE_MUTEX(open_lock
);
61 static struct mmc_blk_data
*mmc_blk_get(struct gendisk
*disk
)
63 struct mmc_blk_data
*md
;
66 md
= disk
->private_data
;
67 if (md
&& md
->usage
== 0)
76 static void mmc_blk_put(struct mmc_blk_data
*md
)
82 mmc_cleanup_queue(&md
->queue
);
88 static inline int mmc_blk_readonly(struct mmc_card
*card
)
90 return mmc_card_readonly(card
) ||
91 !(card
->csd
.cmdclass
& CCC_BLOCK_WRITE
);
94 static int mmc_blk_open(struct inode
*inode
, struct file
*filp
)
96 struct mmc_blk_data
*md
;
99 md
= mmc_blk_get(inode
->i_bdev
->bd_disk
);
102 check_disk_change(inode
->i_bdev
);
105 if ((filp
->f_mode
& FMODE_WRITE
) &&
106 mmc_blk_readonly(md
->queue
.card
))
113 static int mmc_blk_release(struct inode
*inode
, struct file
*filp
)
115 struct mmc_blk_data
*md
= inode
->i_bdev
->bd_disk
->private_data
;
122 mmc_blk_ioctl(struct inode
*inode
, struct file
*filp
, unsigned int cmd
, unsigned long arg
)
124 struct block_device
*bdev
= inode
->i_bdev
;
126 if (cmd
== HDIO_GETGEO
) {
127 struct hd_geometry geo
;
129 memset(&geo
, 0, sizeof(struct hd_geometry
));
131 geo
.cylinders
= get_capacity(bdev
->bd_disk
) / (4 * 16);
134 geo
.start
= get_start_sect(bdev
);
136 return copy_to_user((void __user
*)arg
, &geo
, sizeof(geo
))
143 static struct block_device_operations mmc_bdops
= {
144 .open
= mmc_blk_open
,
145 .release
= mmc_blk_release
,
146 .ioctl
= mmc_blk_ioctl
,
147 .owner
= THIS_MODULE
,
150 struct mmc_blk_request
{
151 struct mmc_request mrq
;
152 struct mmc_command cmd
;
153 struct mmc_command stop
;
154 struct mmc_data data
;
157 static int mmc_blk_prep_rq(struct mmc_queue
*mq
, struct request
*req
)
159 struct mmc_blk_data
*md
= mq
->data
;
160 int stat
= BLKPREP_OK
;
163 * If we have no device, we haven't finished initialising.
165 if (!md
|| !mq
->card
) {
166 printk(KERN_ERR
"%s: killing request - no device/host\n",
167 req
->rq_disk
->disk_name
);
174 static int mmc_blk_issue_rq(struct mmc_queue
*mq
, struct request
*req
)
176 struct mmc_blk_data
*md
= mq
->data
;
177 struct mmc_card
*card
= md
->queue
.card
;
180 if (mmc_card_claim_host(card
))
184 struct mmc_blk_request brq
;
185 struct mmc_command cmd
;
187 memset(&brq
, 0, sizeof(struct mmc_blk_request
));
188 brq
.mrq
.cmd
= &brq
.cmd
;
189 brq
.mrq
.data
= &brq
.data
;
191 brq
.cmd
.arg
= req
->sector
<< 9;
192 brq
.cmd
.flags
= MMC_RSP_R1
;
193 brq
.data
.timeout_ns
= card
->csd
.tacc_ns
* 10;
194 brq
.data
.timeout_clks
= card
->csd
.tacc_clks
* 10;
195 brq
.data
.blksz_bits
= md
->block_bits
;
196 brq
.data
.blocks
= req
->nr_sectors
>> (md
->block_bits
- 9);
197 brq
.stop
.opcode
= MMC_STOP_TRANSMISSION
;
199 brq
.stop
.flags
= MMC_RSP_R1B
;
201 if (rq_data_dir(req
) == READ
) {
202 brq
.cmd
.opcode
= brq
.data
.blocks
> 1 ? MMC_READ_MULTIPLE_BLOCK
: MMC_READ_SINGLE_BLOCK
;
203 brq
.data
.flags
|= MMC_DATA_READ
;
205 brq
.cmd
.opcode
= MMC_WRITE_BLOCK
;
206 brq
.cmd
.flags
= MMC_RSP_R1B
;
207 brq
.data
.flags
|= MMC_DATA_WRITE
;
210 brq
.mrq
.stop
= brq
.data
.blocks
> 1 ? &brq
.stop
: NULL
;
212 brq
.data
.sg
= mq
->sg
;
213 brq
.data
.sg_len
= blk_rq_map_sg(req
->q
, req
, brq
.data
.sg
);
215 mmc_wait_for_req(card
->host
, &brq
.mrq
);
217 printk(KERN_ERR
"%s: error %d sending read/write command\n",
218 req
->rq_disk
->disk_name
, brq
.cmd
.error
);
222 if (brq
.data
.error
) {
223 printk(KERN_ERR
"%s: error %d transferring data\n",
224 req
->rq_disk
->disk_name
, brq
.data
.error
);
228 if (brq
.stop
.error
) {
229 printk(KERN_ERR
"%s: error %d sending stop command\n",
230 req
->rq_disk
->disk_name
, brq
.stop
.error
);
237 cmd
.opcode
= MMC_SEND_STATUS
;
238 cmd
.arg
= card
->rca
<< 16;
239 cmd
.flags
= MMC_RSP_R1
;
240 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 5);
242 printk(KERN_ERR
"%s: error %d requesting status\n",
243 req
->rq_disk
->disk_name
, err
);
246 } while (!(cmd
.resp
[0] & R1_READY_FOR_DATA
));
249 if (cmd
.resp
[0] & ~0x00000900)
250 printk(KERN_ERR
"%s: status = %08x\n",
251 req
->rq_disk
->disk_name
, cmd
.resp
[0]);
252 if (mmc_decode_status(cmd
.resp
))
257 * A block was successfully transferred.
259 spin_lock_irq(&md
->lock
);
260 ret
= end_that_request_chunk(req
, 1, brq
.data
.bytes_xfered
);
263 * The whole request completed successfully.
265 add_disk_randomness(req
->rq_disk
);
266 blkdev_dequeue_request(req
);
267 end_that_request_last(req
);
269 spin_unlock_irq(&md
->lock
);
272 mmc_card_release_host(card
);
277 mmc_card_release_host(card
);
280 * This is a little draconian, but until we get proper
281 * error handling sorted out here, its the best we can
282 * do - especially as some hosts have no idea how much
283 * data was transferred before the error occurred.
285 spin_lock_irq(&md
->lock
);
287 ret
= end_that_request_chunk(req
, 0,
288 req
->current_nr_sectors
<< 9);
291 add_disk_randomness(req
->rq_disk
);
292 blkdev_dequeue_request(req
);
293 end_that_request_last(req
);
294 spin_unlock_irq(&md
->lock
);
299 #define MMC_NUM_MINORS (256 >> MMC_SHIFT)
301 static unsigned long dev_use
[MMC_NUM_MINORS
/(8*sizeof(unsigned long))];
303 static struct mmc_blk_data
*mmc_blk_alloc(struct mmc_card
*card
)
305 struct mmc_blk_data
*md
;
308 devidx
= find_first_zero_bit(dev_use
, MMC_NUM_MINORS
);
309 if (devidx
>= MMC_NUM_MINORS
)
310 return ERR_PTR(-ENOSPC
);
311 __set_bit(devidx
, dev_use
);
313 md
= kmalloc(sizeof(struct mmc_blk_data
), GFP_KERNEL
);
315 memset(md
, 0, sizeof(struct mmc_blk_data
));
317 md
->disk
= alloc_disk(1 << MMC_SHIFT
);
318 if (md
->disk
== NULL
) {
320 md
= ERR_PTR(-ENOMEM
);
324 spin_lock_init(&md
->lock
);
327 ret
= mmc_init_queue(&md
->queue
, card
, &md
->lock
);
334 md
->queue
.prep_fn
= mmc_blk_prep_rq
;
335 md
->queue
.issue_fn
= mmc_blk_issue_rq
;
338 md
->disk
->major
= major
;
339 md
->disk
->first_minor
= devidx
<< MMC_SHIFT
;
340 md
->disk
->fops
= &mmc_bdops
;
341 md
->disk
->private_data
= md
;
342 md
->disk
->queue
= md
->queue
.queue
;
343 md
->disk
->driverfs_dev
= &card
->dev
;
346 * As discussed on lkml, GENHD_FL_REMOVABLE should:
348 * - be set for removable media with permanent block devices
349 * - be unset for removable block devices with permanent media
351 * Since MMC block devices clearly fall under the second
352 * case, we do not set GENHD_FL_REMOVABLE. Userspace
353 * should use the block device creation/destruction hotplug
354 * messages to tell when the card is present.
357 sprintf(md
->disk
->disk_name
, "mmcblk%d", devidx
);
358 sprintf(md
->disk
->devfs_name
, "mmc/blk%d", devidx
);
360 md
->block_bits
= card
->csd
.read_blkbits
;
362 blk_queue_hardsect_size(md
->queue
.queue
, 1 << md
->block_bits
);
363 set_capacity(md
->disk
, card
->csd
.capacity
);
370 mmc_blk_set_blksize(struct mmc_blk_data
*md
, struct mmc_card
*card
)
372 struct mmc_command cmd
;
375 mmc_card_claim_host(card
);
376 cmd
.opcode
= MMC_SET_BLOCKLEN
;
377 cmd
.arg
= 1 << card
->csd
.read_blkbits
;
378 cmd
.flags
= MMC_RSP_R1
;
379 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 5);
380 mmc_card_release_host(card
);
383 printk(KERN_ERR
"%s: unable to set block size to %d: %d\n",
384 md
->disk
->disk_name
, cmd
.arg
, err
);
391 static int mmc_blk_probe(struct mmc_card
*card
)
393 struct mmc_blk_data
*md
;
397 * Check that the card supports the command class(es) we need.
399 if (!(card
->csd
.cmdclass
& CCC_BLOCK_READ
))
402 if (card
->csd
.read_blkbits
< 9) {
403 printk(KERN_WARNING
"%s: read blocksize too small (%u)\n",
404 mmc_card_id(card
), 1 << card
->csd
.read_blkbits
);
408 md
= mmc_blk_alloc(card
);
412 err
= mmc_blk_set_blksize(md
, card
);
416 printk(KERN_INFO
"%s: %s %s %dKiB %s\n",
417 md
->disk
->disk_name
, mmc_card_id(card
), mmc_card_name(card
),
418 (card
->csd
.capacity
<< card
->csd
.read_blkbits
) / 1024,
419 mmc_blk_readonly(card
)?"(ro)":"");
421 mmc_set_drvdata(card
, md
);
431 static void mmc_blk_remove(struct mmc_card
*card
)
433 struct mmc_blk_data
*md
= mmc_get_drvdata(card
);
438 del_gendisk(md
->disk
);
441 * I think this is needed.
443 md
->disk
->queue
= NULL
;
445 devidx
= md
->disk
->first_minor
>> MMC_SHIFT
;
446 __clear_bit(devidx
, dev_use
);
450 mmc_set_drvdata(card
, NULL
);
454 static int mmc_blk_suspend(struct mmc_card
*card
, pm_message_t state
)
456 struct mmc_blk_data
*md
= mmc_get_drvdata(card
);
459 mmc_queue_suspend(&md
->queue
);
464 static int mmc_blk_resume(struct mmc_card
*card
)
466 struct mmc_blk_data
*md
= mmc_get_drvdata(card
);
469 mmc_blk_set_blksize(md
, card
);
470 mmc_queue_resume(&md
->queue
);
475 #define mmc_blk_suspend NULL
476 #define mmc_blk_resume NULL
479 static struct mmc_driver mmc_driver
= {
483 .probe
= mmc_blk_probe
,
484 .remove
= mmc_blk_remove
,
485 .suspend
= mmc_blk_suspend
,
486 .resume
= mmc_blk_resume
,
489 static int __init
mmc_blk_init(void)
493 res
= register_blkdev(major
, "mmc");
495 printk(KERN_WARNING
"Unable to get major %d for MMC media: %d\n",
503 return mmc_register_driver(&mmc_driver
);
509 static void __exit
mmc_blk_exit(void)
511 mmc_unregister_driver(&mmc_driver
);
513 unregister_blkdev(major
, "mmc");
516 module_init(mmc_blk_init
);
517 module_exit(mmc_blk_exit
);
519 MODULE_LICENSE("GPL");
520 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
522 module_param(major
, int, 0444);
523 MODULE_PARM_DESC(major
, "specify the major device number for MMC block driver");