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 int mmc_blk_open(struct inode *inode, struct file *filp)
90 struct mmc_blk_data *md;
93 md = mmc_blk_get(inode->i_bdev->bd_disk);
96 check_disk_change(inode->i_bdev);
103 static int mmc_blk_release(struct inode *inode, struct file *filp)
105 struct mmc_blk_data *md = inode->i_bdev->bd_disk->private_data;
112 mmc_blk_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
114 struct block_device *bdev = inode->i_bdev;
116 if (cmd == HDIO_GETGEO) {
117 struct hd_geometry geo;
119 memset(&geo, 0, sizeof(struct hd_geometry));
121 geo.cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
124 geo.start = get_start_sect(bdev);
126 return copy_to_user((void __user *)arg, &geo, sizeof(geo))
133 static struct block_device_operations mmc_bdops = {
134 .open = mmc_blk_open,
135 .release = mmc_blk_release,
136 .ioctl = mmc_blk_ioctl,
137 .owner = THIS_MODULE,
140 struct mmc_blk_request {
141 struct mmc_request mrq;
142 struct mmc_command cmd;
143 struct mmc_command stop;
144 struct mmc_data data;
147 static int mmc_blk_prep_rq(struct mmc_queue *mq, struct request *req)
149 struct mmc_blk_data *md = mq->data;
150 int stat = BLKPREP_OK;
153 * If we have no device, we haven't finished initialising.
155 if (!md || !mq->card) {
156 printk(KERN_ERR "%s: killing request - no device/host\n",
157 req->rq_disk->disk_name);
164 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
166 struct mmc_blk_data *md = mq->data;
167 struct mmc_card *card = md->queue.card;
170 if (mmc_card_claim_host(card))
174 struct mmc_blk_request brq;
175 struct mmc_command cmd;
177 memset(&brq, 0, sizeof(struct mmc_blk_request));
178 brq.mrq.cmd = &brq.cmd;
179 brq.mrq.data = &brq.data;
181 brq.cmd.arg = req->sector << 9;
182 brq.cmd.flags = MMC_RSP_R1;
184 brq.data.timeout_ns = card->csd.tacc_ns * 10;
185 brq.data.timeout_clks = card->csd.tacc_clks * 10;
186 brq.data.blksz_bits = md->block_bits;
187 brq.data.blocks = req->nr_sectors >> (md->block_bits - 9);
188 brq.stop.opcode = MMC_STOP_TRANSMISSION;
190 brq.stop.flags = MMC_RSP_R1B;
192 if (rq_data_dir(req) == READ) {
193 brq.cmd.opcode = brq.data.blocks > 1 ? MMC_READ_MULTIPLE_BLOCK : MMC_READ_SINGLE_BLOCK;
194 brq.data.flags |= MMC_DATA_READ;
196 brq.cmd.opcode = MMC_WRITE_BLOCK;
197 brq.cmd.flags = MMC_RSP_R1B;
198 brq.data.flags |= MMC_DATA_WRITE;
201 brq.mrq.stop = brq.data.blocks > 1 ? &brq.stop : NULL;
203 brq.data.sg = mq->sg;
204 brq.data.sg_len = blk_rq_map_sg(req->q, req, brq.data.sg);
206 mmc_wait_for_req(card->host, &brq.mrq);
208 printk(KERN_ERR "%s: error %d sending read/write command\n",
209 req->rq_disk->disk_name, brq.cmd.error);
213 if (brq.data.error) {
214 printk(KERN_ERR "%s: error %d transferring data\n",
215 req->rq_disk->disk_name, brq.data.error);
219 if (brq.stop.error) {
220 printk(KERN_ERR "%s: error %d sending stop command\n",
221 req->rq_disk->disk_name, brq.stop.error);
228 cmd.opcode = MMC_SEND_STATUS;
229 cmd.arg = card->rca << 16;
230 cmd.flags = MMC_RSP_R1;
231 err = mmc_wait_for_cmd(card->host, &cmd, 5);
233 printk(KERN_ERR "%s: error %d requesting status\n",
234 req->rq_disk->disk_name, err);
237 } while (!(cmd.resp[0] & R1_READY_FOR_DATA));
240 if (cmd.resp[0] & ~0x00000900)
241 printk(KERN_ERR "%s: status = %08x\n",
242 req->rq_disk->disk_name, cmd.resp[0]);
243 if (mmc_decode_status(cmd.resp))
248 * A block was successfully transferred.
250 spin_lock_irq(&md->lock);
251 ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
254 * The whole request completed successfully.
256 add_disk_randomness(req->rq_disk);
257 blkdev_dequeue_request(req);
258 end_that_request_last(req);
260 spin_unlock_irq(&md->lock);
263 mmc_card_release_host(card);
268 mmc_card_release_host(card);
271 * This is a little draconian, but until we get proper
272 * error handling sorted out here, its the best we can
273 * do - especially as some hosts have no idea how much
274 * data was transferred before the error occurred.
276 spin_lock_irq(&md->lock);
278 ret = end_that_request_chunk(req, 0,
279 req->current_nr_sectors << 9);
282 add_disk_randomness(req->rq_disk);
283 blkdev_dequeue_request(req);
284 end_that_request_last(req);
285 spin_unlock_irq(&md->lock);
290 #define MMC_NUM_MINORS (256 >> MMC_SHIFT)
292 static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))];
294 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
296 struct mmc_blk_data *md;
299 devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
300 if (devidx >= MMC_NUM_MINORS)
301 return ERR_PTR(-ENOSPC);
302 __set_bit(devidx, dev_use);
304 md = kmalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
306 memset(md, 0, sizeof(struct mmc_blk_data));
308 md->disk = alloc_disk(1 << MMC_SHIFT);
309 if (md->disk == NULL) {
311 md = ERR_PTR(-ENOMEM);
315 spin_lock_init(&md->lock);
318 ret = mmc_init_queue(&md->queue, card, &md->lock);
325 md->queue.prep_fn = mmc_blk_prep_rq;
326 md->queue.issue_fn = mmc_blk_issue_rq;
329 md->disk->major = major;
330 md->disk->first_minor = devidx << MMC_SHIFT;
331 md->disk->fops = &mmc_bdops;
332 md->disk->private_data = md;
333 md->disk->queue = md->queue.queue;
334 md->disk->driverfs_dev = &card->dev;
336 sprintf(md->disk->disk_name, "mmcblk%d", devidx);
337 sprintf(md->disk->devfs_name, "mmc/blk%d", devidx);
339 md->block_bits = card->csd.read_blkbits;
341 blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits);
342 set_capacity(md->disk, card->csd.capacity);
349 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
351 struct mmc_command cmd;
354 mmc_card_claim_host(card);
355 cmd.opcode = MMC_SET_BLOCKLEN;
356 cmd.arg = 1 << card->csd.read_blkbits;
357 cmd.flags = MMC_RSP_R1;
358 err = mmc_wait_for_cmd(card->host, &cmd, 5);
359 mmc_card_release_host(card);
362 printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
363 md->disk->disk_name, cmd.arg, err);
370 static int mmc_blk_probe(struct mmc_card *card)
372 struct mmc_blk_data *md;
375 if (card->csd.cmdclass & ~0x1ff)
378 if (card->csd.read_blkbits < 9) {
379 printk(KERN_WARNING "%s: read blocksize too small (%u)\n",
380 mmc_card_id(card), 1 << card->csd.read_blkbits);
384 md = mmc_blk_alloc(card);
388 err = mmc_blk_set_blksize(md, card);
392 printk(KERN_INFO "%s: %s %s %dKiB\n",
393 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
394 (card->csd.capacity << card->csd.read_blkbits) / 1024);
396 mmc_set_drvdata(card, md);
406 static void mmc_blk_remove(struct mmc_card *card)
408 struct mmc_blk_data *md = mmc_get_drvdata(card);
413 del_gendisk(md->disk);
416 * I think this is needed.
418 md->disk->queue = NULL;
420 devidx = md->disk->first_minor >> MMC_SHIFT;
421 __clear_bit(devidx, dev_use);
425 mmc_set_drvdata(card, NULL);
429 static int mmc_blk_suspend(struct mmc_card *card, u32 state)
431 struct mmc_blk_data *md = mmc_get_drvdata(card);
434 mmc_queue_suspend(&md->queue);
439 static int mmc_blk_resume(struct mmc_card *card)
441 struct mmc_blk_data *md = mmc_get_drvdata(card);
444 mmc_blk_set_blksize(md, card);
445 mmc_queue_resume(&md->queue);
450 #define mmc_blk_suspend NULL
451 #define mmc_blk_resume NULL
454 static struct mmc_driver mmc_driver = {
458 .probe = mmc_blk_probe,
459 .remove = mmc_blk_remove,
460 .suspend = mmc_blk_suspend,
461 .resume = mmc_blk_resume,
464 static int __init mmc_blk_init(void)
468 res = register_blkdev(major, "mmc");
470 printk(KERN_WARNING "Unable to get major %d for MMC media: %d\n",
478 return mmc_register_driver(&mmc_driver);
484 static void __exit mmc_blk_exit(void)
486 mmc_unregister_driver(&mmc_driver);
488 unregister_blkdev(major, "mmc");
491 module_init(mmc_blk_init);
492 module_exit(mmc_blk_exit);
494 MODULE_LICENSE("GPL");
495 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
497 module_param(major, int, 0444);
498 MODULE_PARM_DESC(major, "specify the major device number for MMC block driver");