2005-04-16 18:20:36 -04:00
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/*
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* Block driver for media (i.e., flash cards)
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*
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* Copyright 2002 Hewlett-Packard Company
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*
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* Use consistent with the GNU GPL is permitted,
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* provided that this copyright notice is
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* preserved in its entirety in all copies and derived works.
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*
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* HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
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* AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
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* FITNESS FOR ANY PARTICULAR PURPOSE.
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*
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* Many thanks to Alessandro Rubini and Jonathan Corbet!
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*
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* Author: Andrew Christian
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* 28 May 2002
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*/
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#include <linux/moduleparam.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/errno.h>
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#include <linux/hdreg.h>
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#include <linux/kdev_t.h>
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#include <linux/blkdev.h>
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2006-01-12 13:43:35 -05:00
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#include <linux/mutex.h>
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2005-04-16 18:20:36 -04:00
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#include <linux/mmc/card.h>
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2006-06-18 08:34:37 -04:00
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#include <linux/mmc/host.h>
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2005-04-16 18:20:36 -04:00
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#include <linux/mmc/protocol.h>
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2006-08-30 10:14:56 -04:00
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#include <linux/mmc/host.h>
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2005-04-16 18:20:36 -04:00
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include "mmc_queue.h"
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/*
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* max 8 partitions per card
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*/
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#define MMC_SHIFT 3
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static int major;
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/*
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* There is one mmc_blk_data per slot.
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*/
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struct mmc_blk_data {
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spinlock_t lock;
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struct gendisk *disk;
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struct mmc_queue queue;
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unsigned int usage;
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unsigned int block_bits;
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2006-01-03 17:38:44 -05:00
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unsigned int read_only;
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2005-04-16 18:20:36 -04:00
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};
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2006-01-12 13:43:35 -05:00
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static DEFINE_MUTEX(open_lock);
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2005-04-16 18:20:36 -04:00
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static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
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{
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struct mmc_blk_data *md;
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2006-01-12 13:43:35 -05:00
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mutex_lock(&open_lock);
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2005-04-16 18:20:36 -04:00
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md = disk->private_data;
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if (md && md->usage == 0)
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md = NULL;
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if (md)
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md->usage++;
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2006-01-12 13:43:35 -05:00
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mutex_unlock(&open_lock);
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2005-04-16 18:20:36 -04:00
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return md;
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}
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static void mmc_blk_put(struct mmc_blk_data *md)
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{
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2006-01-12 13:43:35 -05:00
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mutex_lock(&open_lock);
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2005-04-16 18:20:36 -04:00
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md->usage--;
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if (md->usage == 0) {
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put_disk(md->disk);
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mmc_cleanup_queue(&md->queue);
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kfree(md);
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}
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2006-01-12 13:43:35 -05:00
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mutex_unlock(&open_lock);
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2005-04-16 18:20:36 -04:00
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}
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static int mmc_blk_open(struct inode *inode, struct file *filp)
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{
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struct mmc_blk_data *md;
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int ret = -ENXIO;
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md = mmc_blk_get(inode->i_bdev->bd_disk);
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if (md) {
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if (md->usage == 2)
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check_disk_change(inode->i_bdev);
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ret = 0;
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2005-09-06 18:18:52 -04:00
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2006-01-03 17:38:44 -05:00
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if ((filp->f_mode & FMODE_WRITE) && md->read_only)
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2005-09-06 18:18:52 -04:00
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ret = -EROFS;
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2005-04-16 18:20:36 -04:00
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}
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return ret;
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}
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static int mmc_blk_release(struct inode *inode, struct file *filp)
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{
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struct mmc_blk_data *md = inode->i_bdev->bd_disk->private_data;
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mmc_blk_put(md);
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return 0;
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}
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static int
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2006-01-08 04:02:50 -05:00
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mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
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2005-04-16 18:20:36 -04:00
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{
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2006-01-08 04:02:50 -05:00
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geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
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geo->heads = 4;
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geo->sectors = 16;
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return 0;
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2005-04-16 18:20:36 -04:00
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}
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static struct block_device_operations mmc_bdops = {
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.open = mmc_blk_open,
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.release = mmc_blk_release,
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2006-01-08 04:02:50 -05:00
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.getgeo = mmc_blk_getgeo,
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2005-04-16 18:20:36 -04:00
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.owner = THIS_MODULE,
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};
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struct mmc_blk_request {
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struct mmc_request mrq;
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struct mmc_command cmd;
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struct mmc_command stop;
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struct mmc_data data;
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};
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static int mmc_blk_prep_rq(struct mmc_queue *mq, struct request *req)
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{
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struct mmc_blk_data *md = mq->data;
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int stat = BLKPREP_OK;
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/*
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* If we have no device, we haven't finished initialising.
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*/
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if (!md || !mq->card) {
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printk(KERN_ERR "%s: killing request - no device/host\n",
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req->rq_disk->disk_name);
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stat = BLKPREP_KILL;
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}
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return stat;
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}
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static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
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{
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struct mmc_blk_data *md = mq->data;
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struct mmc_card *card = md->queue.card;
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2006-10-04 05:15:41 -04:00
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struct mmc_blk_request brq;
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2005-04-16 18:20:36 -04:00
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int ret;
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if (mmc_card_claim_host(card))
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goto cmd_err;
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do {
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struct mmc_command cmd;
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2006-08-30 10:14:56 -04:00
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u32 readcmd, writecmd;
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2005-04-16 18:20:36 -04:00
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memset(&brq, 0, sizeof(struct mmc_blk_request));
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brq.mrq.cmd = &brq.cmd;
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brq.mrq.data = &brq.data;
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brq.cmd.arg = req->sector << 9;
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2006-02-02 07:23:12 -05:00
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brq.cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
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2006-05-19 16:48:03 -04:00
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brq.data.blksz = 1 << md->block_bits;
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2005-04-16 18:20:36 -04:00
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brq.data.blocks = req->nr_sectors >> (md->block_bits - 9);
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brq.stop.opcode = MMC_STOP_TRANSMISSION;
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brq.stop.arg = 0;
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2006-02-02 07:23:12 -05:00
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brq.stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
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2005-04-16 18:20:36 -04:00
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2006-09-07 10:57:12 -04:00
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mmc_set_data_timeout(&brq.data, card, rq_data_dir(req) != READ);
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2006-06-18 08:34:37 -04:00
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2006-08-30 10:14:56 -04:00
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/*
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* If the host doesn't support multiple block writes, force
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* block writes to single block.
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*/
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if (rq_data_dir(req) != READ &&
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!(card->host->caps & MMC_CAP_MULTIWRITE))
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2005-04-16 18:20:36 -04:00
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brq.data.blocks = 1;
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2006-01-09 16:12:17 -05:00
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if (brq.data.blocks > 1) {
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brq.data.flags |= MMC_DATA_MULTI;
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brq.mrq.stop = &brq.stop;
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2006-08-30 10:14:56 -04:00
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readcmd = MMC_READ_MULTIPLE_BLOCK;
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writecmd = MMC_WRITE_MULTIPLE_BLOCK;
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2006-01-09 16:12:17 -05:00
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} else {
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brq.mrq.stop = NULL;
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2006-08-30 10:14:56 -04:00
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readcmd = MMC_READ_SINGLE_BLOCK;
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writecmd = MMC_WRITE_BLOCK;
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}
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if (rq_data_dir(req) == READ) {
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brq.cmd.opcode = readcmd;
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brq.data.flags |= MMC_DATA_READ;
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} else {
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brq.cmd.opcode = writecmd;
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brq.data.flags |= MMC_DATA_WRITE;
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2006-01-09 16:12:17 -05:00
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}
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2005-04-16 18:20:36 -04:00
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brq.data.sg = mq->sg;
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brq.data.sg_len = blk_rq_map_sg(req->q, req, brq.data.sg);
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mmc_wait_for_req(card->host, &brq.mrq);
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if (brq.cmd.error) {
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printk(KERN_ERR "%s: error %d sending read/write command\n",
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req->rq_disk->disk_name, brq.cmd.error);
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goto cmd_err;
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}
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if (brq.data.error) {
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printk(KERN_ERR "%s: error %d transferring data\n",
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req->rq_disk->disk_name, brq.data.error);
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goto cmd_err;
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}
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if (brq.stop.error) {
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printk(KERN_ERR "%s: error %d sending stop command\n",
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req->rq_disk->disk_name, brq.stop.error);
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goto cmd_err;
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}
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2006-09-24 05:46:43 -04:00
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if (rq_data_dir(req) != READ) {
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do {
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int err;
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cmd.opcode = MMC_SEND_STATUS;
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cmd.arg = card->rca << 16;
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cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
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err = mmc_wait_for_cmd(card->host, &cmd, 5);
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if (err) {
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printk(KERN_ERR "%s: error %d requesting status\n",
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req->rq_disk->disk_name, err);
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goto cmd_err;
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}
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} while (!(cmd.resp[0] & R1_READY_FOR_DATA));
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2005-04-16 18:20:36 -04:00
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#if 0
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2006-09-24 05:46:43 -04:00
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if (cmd.resp[0] & ~0x00000900)
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printk(KERN_ERR "%s: status = %08x\n",
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req->rq_disk->disk_name, cmd.resp[0]);
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if (mmc_decode_status(cmd.resp))
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goto cmd_err;
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2005-04-16 18:20:36 -04:00
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#endif
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2006-09-24 05:46:43 -04:00
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}
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2005-04-16 18:20:36 -04:00
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/*
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* A block was successfully transferred.
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*/
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spin_lock_irq(&md->lock);
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ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
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if (!ret) {
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/*
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* The whole request completed successfully.
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*/
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add_disk_randomness(req->rq_disk);
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blkdev_dequeue_request(req);
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2006-01-06 03:49:03 -05:00
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end_that_request_last(req, 1);
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2005-04-16 18:20:36 -04:00
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}
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spin_unlock_irq(&md->lock);
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} while (ret);
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mmc_card_release_host(card);
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return 1;
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cmd_err:
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mmc_card_release_host(card);
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2006-10-04 05:15:41 -04:00
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ret = 1;
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2005-04-16 18:20:36 -04:00
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/*
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2006-10-04 05:15:41 -04:00
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* For writes and where the host claims to support proper
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* error reporting, we first ok the successful blocks.
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*
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* For reads we just fail the entire chunk as that should
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* be safe in all cases.
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2005-04-16 18:20:36 -04:00
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*/
|
2006-10-04 05:15:41 -04:00
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if (rq_data_dir(req) != READ &&
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(card->host->caps & MMC_CAP_MULTIWRITE)) {
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spin_lock_irq(&md->lock);
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ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
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spin_unlock_irq(&md->lock);
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}
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2005-04-16 18:20:36 -04:00
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spin_lock_irq(&md->lock);
|
2006-10-04 05:15:41 -04:00
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while (ret) {
|
2005-04-16 18:20:36 -04:00
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ret = end_that_request_chunk(req, 0,
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req->current_nr_sectors << 9);
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2006-10-04 05:15:41 -04:00
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}
|
2005-04-16 18:20:36 -04:00
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add_disk_randomness(req->rq_disk);
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blkdev_dequeue_request(req);
|
2006-01-06 03:49:03 -05:00
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end_that_request_last(req, 0);
|
2005-04-16 18:20:36 -04:00
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spin_unlock_irq(&md->lock);
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return 0;
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}
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#define MMC_NUM_MINORS (256 >> MMC_SHIFT)
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static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))];
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|
2006-01-03 17:38:44 -05:00
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static inline int mmc_blk_readonly(struct mmc_card *card)
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{
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return mmc_card_readonly(card) ||
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!(card->csd.cmdclass & CCC_BLOCK_WRITE);
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}
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|
2005-04-16 18:20:36 -04:00
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|
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static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
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{
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struct mmc_blk_data *md;
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int devidx, ret;
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devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
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if (devidx >= MMC_NUM_MINORS)
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return ERR_PTR(-ENOSPC);
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__set_bit(devidx, dev_use);
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md = kmalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
|
2006-01-03 17:38:44 -05:00
|
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|
if (!md) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2006-01-03 17:38:44 -05:00
|
|
|
memset(md, 0, sizeof(struct mmc_blk_data));
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2006-01-03 17:38:44 -05:00
|
|
|
/*
|
|
|
|
* Set the read-only status based on the supported commands
|
|
|
|
* and the write protect switch.
|
|
|
|
*/
|
|
|
|
md->read_only = mmc_blk_readonly(card);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2006-01-03 17:38:44 -05:00
|
|
|
/*
|
2006-09-07 11:01:30 -04:00
|
|
|
* Both SD and MMC specifications state (although a bit
|
|
|
|
* unclearly in the MMC case) that a block size of 512
|
|
|
|
* bytes must always be supported by the card.
|
2006-01-03 17:38:44 -05:00
|
|
|
*/
|
2006-09-07 11:01:30 -04:00
|
|
|
md->block_bits = 9;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2006-01-03 17:38:44 -05:00
|
|
|
md->disk = alloc_disk(1 << MMC_SHIFT);
|
|
|
|
if (md->disk == NULL) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto err_kfree;
|
|
|
|
}
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2006-01-03 17:38:44 -05:00
|
|
|
spin_lock_init(&md->lock);
|
|
|
|
md->usage = 1;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2006-01-03 17:38:44 -05:00
|
|
|
ret = mmc_init_queue(&md->queue, card, &md->lock);
|
|
|
|
if (ret)
|
|
|
|
goto err_putdisk;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2006-01-03 17:38:44 -05:00
|
|
|
md->queue.prep_fn = mmc_blk_prep_rq;
|
|
|
|
md->queue.issue_fn = mmc_blk_issue_rq;
|
|
|
|
md->queue.data = md;
|
2005-12-22 18:21:38 -05:00
|
|
|
|
2006-01-03 17:38:44 -05:00
|
|
|
md->disk->major = major;
|
|
|
|
md->disk->first_minor = devidx << MMC_SHIFT;
|
|
|
|
md->disk->fops = &mmc_bdops;
|
|
|
|
md->disk->private_data = md;
|
|
|
|
md->disk->queue = md->queue.queue;
|
|
|
|
md->disk->driverfs_dev = &card->dev;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* As discussed on lkml, GENHD_FL_REMOVABLE should:
|
|
|
|
*
|
|
|
|
* - be set for removable media with permanent block devices
|
|
|
|
* - be unset for removable block devices with permanent media
|
|
|
|
*
|
|
|
|
* Since MMC block devices clearly fall under the second
|
|
|
|
* case, we do not set GENHD_FL_REMOVABLE. Userspace
|
|
|
|
* should use the block device creation/destruction hotplug
|
|
|
|
* messages to tell when the card is present.
|
|
|
|
*/
|
|
|
|
|
|
|
|
sprintf(md->disk->disk_name, "mmcblk%d", devidx);
|
|
|
|
|
|
|
|
blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The CSD capacity field is in units of read_blkbits.
|
|
|
|
* set_capacity takes units of 512 bytes.
|
|
|
|
*/
|
|
|
|
set_capacity(md->disk, card->csd.capacity << (card->csd.read_blkbits - 9));
|
2005-04-16 18:20:36 -04:00
|
|
|
return md;
|
2006-01-03 17:38:44 -05:00
|
|
|
|
|
|
|
err_putdisk:
|
|
|
|
put_disk(md->disk);
|
|
|
|
err_kfree:
|
|
|
|
kfree(md);
|
|
|
|
out:
|
|
|
|
return ERR_PTR(ret);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
|
|
|
|
{
|
|
|
|
struct mmc_command cmd;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
mmc_card_claim_host(card);
|
|
|
|
cmd.opcode = MMC_SET_BLOCKLEN;
|
2005-12-22 18:21:38 -05:00
|
|
|
cmd.arg = 1 << md->block_bits;
|
2006-02-02 07:23:12 -05:00
|
|
|
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
|
2005-04-16 18:20:36 -04:00
|
|
|
err = mmc_wait_for_cmd(card->host, &cmd, 5);
|
|
|
|
mmc_card_release_host(card);
|
|
|
|
|
|
|
|
if (err) {
|
|
|
|
printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
|
|
|
|
md->disk->disk_name, cmd.arg, err);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mmc_blk_probe(struct mmc_card *card)
|
|
|
|
{
|
|
|
|
struct mmc_blk_data *md;
|
|
|
|
int err;
|
|
|
|
|
2005-05-21 05:27:02 -04:00
|
|
|
/*
|
|
|
|
* Check that the card supports the command class(es) we need.
|
|
|
|
*/
|
|
|
|
if (!(card->csd.cmdclass & CCC_BLOCK_READ))
|
2005-04-16 18:20:36 -04:00
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
md = mmc_blk_alloc(card);
|
|
|
|
if (IS_ERR(md))
|
|
|
|
return PTR_ERR(md);
|
|
|
|
|
|
|
|
err = mmc_blk_set_blksize(md, card);
|
|
|
|
if (err)
|
|
|
|
goto out;
|
|
|
|
|
2006-01-13 16:44:18 -05:00
|
|
|
printk(KERN_INFO "%s: %s %s %lluKiB %s\n",
|
2005-04-16 18:20:36 -04:00
|
|
|
md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
|
2006-01-13 16:44:18 -05:00
|
|
|
(unsigned long long)(get_capacity(md->disk) >> 1),
|
|
|
|
md->read_only ? "(ro)" : "");
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
mmc_set_drvdata(card, md);
|
|
|
|
add_disk(md->disk);
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
out:
|
|
|
|
mmc_blk_put(md);
|
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mmc_blk_remove(struct mmc_card *card)
|
|
|
|
{
|
|
|
|
struct mmc_blk_data *md = mmc_get_drvdata(card);
|
|
|
|
|
|
|
|
if (md) {
|
|
|
|
int devidx;
|
|
|
|
|
|
|
|
del_gendisk(md->disk);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* I think this is needed.
|
|
|
|
*/
|
|
|
|
md->disk->queue = NULL;
|
|
|
|
|
|
|
|
devidx = md->disk->first_minor >> MMC_SHIFT;
|
|
|
|
__clear_bit(devidx, dev_use);
|
|
|
|
|
|
|
|
mmc_blk_put(md);
|
|
|
|
}
|
|
|
|
mmc_set_drvdata(card, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
|
|
|
|
{
|
|
|
|
struct mmc_blk_data *md = mmc_get_drvdata(card);
|
|
|
|
|
|
|
|
if (md) {
|
|
|
|
mmc_queue_suspend(&md->queue);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mmc_blk_resume(struct mmc_card *card)
|
|
|
|
{
|
|
|
|
struct mmc_blk_data *md = mmc_get_drvdata(card);
|
|
|
|
|
|
|
|
if (md) {
|
|
|
|
mmc_blk_set_blksize(md, card);
|
|
|
|
mmc_queue_resume(&md->queue);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
#define mmc_blk_suspend NULL
|
|
|
|
#define mmc_blk_resume NULL
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static struct mmc_driver mmc_driver = {
|
|
|
|
.drv = {
|
|
|
|
.name = "mmcblk",
|
|
|
|
},
|
|
|
|
.probe = mmc_blk_probe,
|
|
|
|
.remove = mmc_blk_remove,
|
|
|
|
.suspend = mmc_blk_suspend,
|
|
|
|
.resume = mmc_blk_resume,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init mmc_blk_init(void)
|
|
|
|
{
|
|
|
|
int res = -ENOMEM;
|
|
|
|
|
|
|
|
res = register_blkdev(major, "mmc");
|
|
|
|
if (res < 0) {
|
|
|
|
printk(KERN_WARNING "Unable to get major %d for MMC media: %d\n",
|
|
|
|
major, res);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
if (major == 0)
|
|
|
|
major = res;
|
|
|
|
|
|
|
|
return mmc_register_driver(&mmc_driver);
|
|
|
|
|
|
|
|
out:
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit mmc_blk_exit(void)
|
|
|
|
{
|
|
|
|
mmc_unregister_driver(&mmc_driver);
|
|
|
|
unregister_blkdev(major, "mmc");
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(mmc_blk_init);
|
|
|
|
module_exit(mmc_blk_exit);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
|
|
|
|
|
|
|
|
module_param(major, int, 0444);
|
|
|
|
MODULE_PARM_DESC(major, "specify the major device number for MMC block driver");
|