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
46 static int maxsectors = 8;
49 * There is one mmc_blk_data per slot.
54 struct mmc_queue queue;
57 unsigned int block_bits;
60 static DECLARE_MUTEX(open_lock);
62 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
64 struct mmc_blk_data *md;
67 md = disk->private_data;
68 if (md && md->usage == 0)
77 static void mmc_blk_put(struct mmc_blk_data *md)
83 mmc_cleanup_queue(&md->queue);
89 static int mmc_blk_open(struct inode *inode, struct file *filp)
91 struct mmc_blk_data *md;
94 md = mmc_blk_get(inode->i_bdev->bd_disk);
97 check_disk_change(inode->i_bdev);
104 static int mmc_blk_release(struct inode *inode, struct file *filp)
106 struct mmc_blk_data *md = inode->i_bdev->bd_disk->private_data;
113 mmc_blk_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
115 struct block_device *bdev = inode->i_bdev;
117 if (cmd == HDIO_GETGEO) {
118 struct hd_geometry geo;
120 memset(&geo, 0, sizeof(struct hd_geometry));
122 geo.cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
125 geo.start = get_start_sect(bdev);
127 return copy_to_user((void *)arg, &geo, sizeof(geo))
134 static struct block_device_operations mmc_bdops = {
135 .open = mmc_blk_open,
136 .release = mmc_blk_release,
137 .ioctl = mmc_blk_ioctl,
138 .owner = THIS_MODULE,
141 struct mmc_blk_request {
142 struct mmc_request mrq;
143 struct mmc_command cmd;
144 struct mmc_command stop;
145 struct mmc_data data;
148 static int mmc_blk_prep_rq(struct mmc_queue *mq, struct request *req)
150 struct mmc_blk_data *md = mq->data;
151 int stat = BLKPREP_OK;
154 * If we have no device, we haven't finished initialising.
156 if (!md || !mq->card) {
157 printk(KERN_ERR "%s: killing request - no device/host\n",
158 req->rq_disk->disk_name);
165 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
167 struct mmc_blk_data *md = mq->data;
168 struct mmc_card *card = md->queue.card;
171 if (mmc_card_claim_host(card))
175 struct mmc_blk_request brq;
176 struct mmc_command cmd;
178 memset(&brq, 0, sizeof(struct mmc_blk_request));
179 brq.mrq.cmd = &brq.cmd;
180 brq.mrq.data = &brq.data;
182 brq.cmd.arg = req->sector << 9;
183 brq.cmd.flags = MMC_RSP_SHORT | MMC_RSP_CRC;
185 brq.data.timeout_ns = card->csd.tacc_ns * 10;
186 brq.data.timeout_clks = card->csd.tacc_clks * 10;
187 brq.data.blksz_bits = md->block_bits;
188 brq.data.blocks = req->current_nr_sectors >> (md->block_bits - 9);
189 brq.stop.opcode = MMC_STOP_TRANSMISSION;
191 brq.stop.flags = MMC_RSP_SHORT | MMC_RSP_CRC | MMC_RSP_BUSY;
193 if (rq_data_dir(req) == READ) {
194 brq.cmd.opcode = brq.data.blocks > 1 ? MMC_READ_MULTIPLE_BLOCK : MMC_READ_SINGLE_BLOCK;
195 brq.data.flags |= MMC_DATA_READ;
197 brq.cmd.opcode = MMC_WRITE_BLOCK;
198 brq.cmd.flags |= MMC_RSP_BUSY;
199 brq.data.flags |= MMC_DATA_WRITE;
202 brq.mrq.stop = brq.data.blocks > 1 ? &brq.stop : NULL;
204 mmc_wait_for_req(card->host, &brq.mrq);
206 printk(KERN_ERR "%s: error %d sending read/write command\n",
207 req->rq_disk->disk_name, brq.cmd.error);
211 if (brq.data.error) {
212 printk(KERN_ERR "%s: error %d transferring data\n",
213 req->rq_disk->disk_name, brq.data.error);
217 if (brq.stop.error) {
218 printk(KERN_ERR "%s: error %d sending stop command\n",
219 req->rq_disk->disk_name, brq.stop.error);
226 cmd.opcode = MMC_SEND_STATUS;
227 cmd.arg = card->rca << 16;
228 cmd.flags = MMC_RSP_SHORT | MMC_RSP_CRC;
229 err = mmc_wait_for_cmd(card->host, &cmd, 5);
231 printk(KERN_ERR "%s: error %d requesting status\n",
232 req->rq_disk->disk_name, err);
235 } while (!(cmd.resp[0] & R1_READY_FOR_DATA));
238 if (cmd.resp[0] & ~0x00000900)
239 printk(KERN_ERR "%s: status = %08x\n",
240 req->rq_disk->disk_name, cmd.resp[0]);
241 if (mmc_decode_status(cmd.resp))
246 * A block was successfully transferred.
248 spin_lock_irq(&md->lock);
249 ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
252 * The whole request completed successfully.
254 add_disk_randomness(req->rq_disk);
255 blkdev_dequeue_request(req);
256 end_that_request_last(req);
258 spin_unlock_irq(&md->lock);
261 mmc_card_release_host(card);
266 mmc_card_release_host(card);
269 * This is a little draconian, but until we get proper
270 * error handling sorted out here, its the best we can
271 * do - especially as some hosts have no idea how much
272 * data was transferred before the error occurred.
274 spin_lock_irq(&md->lock);
276 ret = end_that_request_chunk(req, 0,
277 req->current_nr_sectors << 9);
280 add_disk_randomness(req->rq_disk);
281 blkdev_dequeue_request(req);
282 end_that_request_last(req);
283 spin_unlock_irq(&md->lock);
288 #define MMC_NUM_MINORS (256 >> MMC_SHIFT)
290 static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))];
292 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
294 struct mmc_blk_data *md;
297 devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
298 if (devidx >= MMC_NUM_MINORS)
299 return ERR_PTR(-ENOSPC);
300 __set_bit(devidx, dev_use);
302 md = kmalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
304 memset(md, 0, sizeof(struct mmc_blk_data));
306 md->disk = alloc_disk(1 << MMC_SHIFT);
307 if (md->disk == NULL) {
309 md = ERR_PTR(-ENOMEM);
313 spin_lock_init(&md->lock);
316 ret = mmc_init_queue(&md->queue, card, &md->lock);
323 md->queue.prep_fn = mmc_blk_prep_rq;
324 md->queue.issue_fn = mmc_blk_issue_rq;
327 md->disk->major = mmc_major;
328 md->disk->first_minor = devidx << MMC_SHIFT;
329 md->disk->fops = &mmc_bdops;
330 md->disk->private_data = md;
331 md->disk->queue = md->queue.queue;
332 md->disk->driverfs_dev = &card->dev;
334 sprintf(md->disk->disk_name, "mmcblk%d", devidx);
335 sprintf(md->disk->devfs_name, "mmc/blk%d", devidx);
337 md->block_bits = md->queue.card->csd.read_blkbits;
339 blk_queue_max_sectors(md->queue.queue, maxsectors);
340 blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits);
341 set_capacity(md->disk, md->queue.card->csd.capacity);
348 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
350 struct mmc_command cmd;
353 mmc_card_claim_host(card);
354 cmd.opcode = MMC_SET_BLOCKLEN;
355 cmd.arg = 1 << card->csd.read_blkbits;
356 cmd.flags = MMC_RSP_SHORT | MMC_RSP_CRC;
357 err = mmc_wait_for_cmd(card->host, &cmd, 5);
358 mmc_card_release_host(card);
361 printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
362 md->disk->disk_name, cmd.arg, err);
369 static int mmc_blk_probe(struct mmc_card *card)
371 struct mmc_blk_data *md;
374 if (card->csd.cmdclass & ~0x1ff)
377 if (card->csd.read_blkbits < 9) {
378 printk(KERN_WARNING "%s: read blocksize too small (%u)\n",
379 mmc_card_id(card), 1 << card->csd.read_blkbits);
383 md = mmc_blk_alloc(card);
387 err = mmc_blk_set_blksize(md, card);
391 printk(KERN_INFO "%s: %s %s %dKiB\n",
392 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
393 (card->csd.capacity << card->csd.read_blkbits) / 1024);
395 mmc_set_drvdata(card, md);
405 static void mmc_blk_remove(struct mmc_card *card)
407 struct mmc_blk_data *md = mmc_get_drvdata(card);
412 del_gendisk(md->disk);
415 * I think this is needed.
417 md->disk->queue = NULL;
419 devidx = md->disk->first_minor >> MMC_SHIFT;
420 __clear_bit(devidx, dev_use);
424 mmc_set_drvdata(card, NULL);
428 static int mmc_blk_suspend(struct mmc_card *card, u32 state)
430 struct mmc_blk_data *md = mmc_get_drvdata(card);
433 blk_stop_queue(md->queue.queue);
438 static int mmc_blk_resume(struct mmc_card *card)
440 struct mmc_blk_data *md = mmc_get_drvdata(card);
443 mmc_blk_set_blksize(md, md->queue.card);
444 blk_start_queue(md->queue.queue);
449 #define mmc_blk_suspend NULL
450 #define mmc_blk_resume NULL
453 static struct mmc_driver mmc_driver = {
457 .probe = mmc_blk_probe,
458 .remove = mmc_blk_remove,
459 .suspend = mmc_blk_suspend,
460 .resume = mmc_blk_resume,
463 static int __init mmc_blk_init(void)
467 res = register_blkdev(mmc_major, "mmc");
469 printk(KERN_WARNING "Unable to get major %d for MMC media: %d\n",
477 return mmc_register_driver(&mmc_driver);
483 static void __exit mmc_blk_exit(void)
485 mmc_unregister_driver(&mmc_driver);
487 unregister_blkdev(mmc_major, "mmc");
490 module_init(mmc_blk_init);
491 module_exit(mmc_blk_exit);
492 module_param(maxsectors, int, 0444);
494 MODULE_PARM_DESC(maxsectors, "Maximum number of sectors for a single request");
496 MODULE_LICENSE("GPL");
497 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");