block.c revision f331c0296f2a9fee0d396a70598b954062603015
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Block driver for media (i.e., flash cards) 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright 2002 Hewlett-Packard Company 5979ce7208a679b8d012450610d5d5aa75aab3af9Pierre Ossman * Copyright 2005-2008 Pierre Ossman 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Use consistent with the GNU GPL is permitted, 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * provided that this copyright notice is 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * preserved in its entirety in all copies and derived works. 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED, 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * FITNESS FOR ANY PARTICULAR PURPOSE. 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Many thanks to Alessandro Rubini and Jonathan Corbet! 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Author: Andrew Christian 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 28 May 2002 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/moduleparam.h> 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kernel.h> 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/fs.h> 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/errno.h> 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/hdreg.h> 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kdev_t.h> 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/blkdev.h> 30a621aaed690b9439141c555941b6af53873f6ff1Arjan van de Ven#include <linux/mutex.h> 31ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman#include <linux/scatterlist.h> 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mmc/card.h> 34385e3227d4d83ab13d7767c4bb3593b0256bf246Pierre Ossman#include <linux/mmc/host.h> 35da7fbe58d2d347e95af699ddf04d885be6362bbePierre Ossman#include <linux/mmc/mmc.h> 36da7fbe58d2d347e95af699ddf04d885be6362bbePierre Ossman#include <linux/mmc/sd.h> 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/system.h> 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/uaccess.h> 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4198ac2162699f7e9880683cb954891817f20b607cPierre Ossman#include "queue.h" 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * max 8 partitions per card 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define MMC_SHIFT 3 471dff314451fa24d6b107aa05393d3169e56a7e0aDavid Woodhouse#define MMC_NUM_MINORS (256 >> MMC_SHIFT) 481dff314451fa24d6b107aa05393d3169e56a7e0aDavid Woodhouse 49203c80187eba037f2d6562e0d5847014746726ddBen Collinsstatic DECLARE_BITMAP(dev_use, MMC_NUM_MINORS); 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * There is one mmc_blk_data per slot. 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct mmc_blk_data { 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spinlock_t lock; 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct gendisk *disk; 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_queue queue; 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int usage; 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int block_bits; 61a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King unsigned int read_only; 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 64a621aaed690b9439141c555941b6af53873f6ff1Arjan van de Venstatic DEFINE_MUTEX(open_lock); 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_blk_data *md; 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 70a621aaed690b9439141c555941b6af53873f6ff1Arjan van de Ven mutex_lock(&open_lock); 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds md = disk->private_data; 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (md && md->usage == 0) 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds md = NULL; 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (md) 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds md->usage++; 76a621aaed690b9439141c555941b6af53873f6ff1Arjan van de Ven mutex_unlock(&open_lock); 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return md; 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void mmc_blk_put(struct mmc_blk_data *md) 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 83a621aaed690b9439141c555941b6af53873f6ff1Arjan van de Ven mutex_lock(&open_lock); 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds md->usage--; 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (md->usage == 0) { 86f331c0296f2a9fee0d396a70598b954062603015Tejun Heo int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT; 871dff314451fa24d6b107aa05393d3169e56a7e0aDavid Woodhouse __clear_bit(devidx, dev_use); 881dff314451fa24d6b107aa05393d3169e56a7e0aDavid Woodhouse 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds put_disk(md->disk); 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(md); 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 92a621aaed690b9439141c555941b6af53873f6ff1Arjan van de Ven mutex_unlock(&open_lock); 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mmc_blk_open(struct inode *inode, struct file *filp) 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_blk_data *md; 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret = -ENXIO; 991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds md = mmc_blk_get(inode->i_bdev->bd_disk); 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (md) { 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (md->usage == 2) 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds check_disk_change(inode->i_bdev); 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = 0; 105a00fc09029f02ca833cf90e5d5625f08c4ac4f51Pierre Ossman 10670bb08962ea9bd50797ae9f16b2493f5f7c65053Andrew Morton if ((filp->f_mode & FMODE_WRITE) && md->read_only) { 10770bb08962ea9bd50797ae9f16b2493f5f7c65053Andrew Morton mmc_blk_put(md); 108a00fc09029f02ca833cf90e5d5625f08c4ac4f51Pierre Ossman ret = -EROFS; 10970bb08962ea9bd50797ae9f16b2493f5f7c65053Andrew Morton } 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 1131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mmc_blk_release(struct inode *inode, struct file *filp) 1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_blk_data *md = inode->i_bdev->bd_disk->private_data; 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mmc_blk_put(md); 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 124a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwigmmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) 1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 126a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16); 127a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig geo->heads = 4; 128a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig geo->sectors = 16; 129a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig return 0; 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct block_device_operations mmc_bdops = { 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .open = mmc_blk_open, 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .release = mmc_blk_release, 135a885c8c4316e1c1d2d2c8755da3f3d14f852528dChristoph Hellwig .getgeo = mmc_blk_getgeo, 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .owner = THIS_MODULE, 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct mmc_blk_request { 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_request mrq; 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_command cmd; 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_command stop; 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_data data; 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 146ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossmanstatic u32 mmc_sd_num_wr_blocks(struct mmc_card *card) 147ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman{ 148ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman int err; 149ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman u32 blocks; 150ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 151ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman struct mmc_request mrq; 152ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman struct mmc_command cmd; 153ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman struct mmc_data data; 154ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman unsigned int timeout_us; 155ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 156ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman struct scatterlist sg; 157ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 158ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman memset(&cmd, 0, sizeof(struct mmc_command)); 159ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 160ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman cmd.opcode = MMC_APP_CMD; 161ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman cmd.arg = card->rca << 16; 1627213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; 163ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 164ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman err = mmc_wait_for_cmd(card->host, &cmd, 0); 1657213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell if (err) 1667213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell return (u32)-1; 1677213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD)) 168ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman return (u32)-1; 169ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 170ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman memset(&cmd, 0, sizeof(struct mmc_command)); 171ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 172ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman cmd.opcode = SD_APP_SEND_NUM_WR_BLKS; 173ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman cmd.arg = 0; 1747213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 175ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 176ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman memset(&data, 0, sizeof(struct mmc_data)); 177ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 178ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman data.timeout_ns = card->csd.tacc_ns * 100; 179ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman data.timeout_clks = card->csd.tacc_clks * 100; 180ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 181ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman timeout_us = data.timeout_ns / 1000; 182ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman timeout_us += data.timeout_clks * 1000 / 183ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman (card->host->ios.clock / 1000); 184ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 185ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman if (timeout_us > 100000) { 186ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman data.timeout_ns = 100000000; 187ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman data.timeout_clks = 0; 188ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman } 189ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 190ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman data.blksz = 4; 191ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman data.blocks = 1; 192ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman data.flags = MMC_DATA_READ; 193ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman data.sg = &sg; 194ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman data.sg_len = 1; 195ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 196ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman memset(&mrq, 0, sizeof(struct mmc_request)); 197ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 198ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman mrq.cmd = &cmd; 199ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman mrq.data = &data; 200ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 201ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman sg_init_one(&sg, &blocks, 4); 202ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 203ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman mmc_wait_for_req(card->host, &mrq); 204ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 20517b0429dde9ab60f9cee8e07ab28c7dc6cfe6efdPierre Ossman if (cmd.error || data.error) 206ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman return (u32)-1; 207ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 208ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman blocks = ntohl(blocks); 209ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 210ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman return blocks; 211ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman} 212ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_blk_data *md = mq->data; 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_card *card = md->queue.card; 217176f00ffed3ef94a198326fbf6a5db64f1cf73adPierre Ossman struct mmc_blk_request brq; 218b41e9c7b8e14ea57aa0fc05fd63a0de0e935d58dPierre Ossman int ret = 1, data_size, i; 219b41e9c7b8e14ea57aa0fc05fd63a0de0e935d58dPierre Ossman struct scatterlist *sg; 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 221b855885e3b60cf6f9452848712a62517b94583ebPierre Ossman mmc_claim_host(card->host); 2221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do { 2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_command cmd; 225db53f28b3a6d9338cca1b7e917dc063ac99e1871Russell King u32 readcmd, writecmd; 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memset(&brq, 0, sizeof(struct mmc_blk_request)); 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds brq.mrq.cmd = &brq.cmd; 2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds brq.mrq.data = &brq.data; 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 231fba68bd2dab1ac99af3c5a963ec9581cfa9f1725Philip Langdale brq.cmd.arg = req->sector; 232fba68bd2dab1ac99af3c5a963ec9581cfa9f1725Philip Langdale if (!mmc_card_blockaddr(card)) 233fba68bd2dab1ac99af3c5a963ec9581cfa9f1725Philip Langdale brq.cmd.arg <<= 9; 2347213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 2352c171bf13423dc5293188cea7f6c2da1720926e2Pavel Pisa brq.data.blksz = 1 << md->block_bits; 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds brq.stop.opcode = MMC_STOP_TRANSMISSION; 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds brq.stop.arg = 0; 2387213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; 23955db890a838c7b37256241b1fc53d6344aa79cc0Pierre Ossman brq.data.blocks = req->nr_sectors >> (md->block_bits - 9); 24055db890a838c7b37256241b1fc53d6344aa79cc0Pierre Ossman if (brq.data.blocks > card->host->max_blk_count) 24155db890a838c7b37256241b1fc53d6344aa79cc0Pierre Ossman brq.data.blocks = card->host->max_blk_count; 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 243788ee7b09883515f3a72a8f2a980df5e94f37e2cRussell King if (brq.data.blocks > 1) { 2447213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell /* SPI multiblock writes terminate using a special 2457213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell * token, not a STOP_TRANSMISSION request. 2467213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell */ 2477213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell if (!mmc_host_is_spi(card->host) 2487213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell || rq_data_dir(req) == READ) 2497213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell brq.mrq.stop = &brq.stop; 250db53f28b3a6d9338cca1b7e917dc063ac99e1871Russell King readcmd = MMC_READ_MULTIPLE_BLOCK; 251db53f28b3a6d9338cca1b7e917dc063ac99e1871Russell King writecmd = MMC_WRITE_MULTIPLE_BLOCK; 252788ee7b09883515f3a72a8f2a980df5e94f37e2cRussell King } else { 253788ee7b09883515f3a72a8f2a980df5e94f37e2cRussell King brq.mrq.stop = NULL; 254db53f28b3a6d9338cca1b7e917dc063ac99e1871Russell King readcmd = MMC_READ_SINGLE_BLOCK; 255db53f28b3a6d9338cca1b7e917dc063ac99e1871Russell King writecmd = MMC_WRITE_BLOCK; 256db53f28b3a6d9338cca1b7e917dc063ac99e1871Russell King } 257db53f28b3a6d9338cca1b7e917dc063ac99e1871Russell King 258db53f28b3a6d9338cca1b7e917dc063ac99e1871Russell King if (rq_data_dir(req) == READ) { 259db53f28b3a6d9338cca1b7e917dc063ac99e1871Russell King brq.cmd.opcode = readcmd; 260db53f28b3a6d9338cca1b7e917dc063ac99e1871Russell King brq.data.flags |= MMC_DATA_READ; 261db53f28b3a6d9338cca1b7e917dc063ac99e1871Russell King } else { 262db53f28b3a6d9338cca1b7e917dc063ac99e1871Russell King brq.cmd.opcode = writecmd; 263db53f28b3a6d9338cca1b7e917dc063ac99e1871Russell King brq.data.flags |= MMC_DATA_WRITE; 264788ee7b09883515f3a72a8f2a980df5e94f37e2cRussell King } 2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 266b146d26a61e0feab2f12a98ae83fd352830899c0Pierre Ossman mmc_set_data_timeout(&brq.data, card); 267b146d26a61e0feab2f12a98ae83fd352830899c0Pierre Ossman 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds brq.data.sg = mq->sg; 26998ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman brq.data.sg_len = mmc_queue_map_sg(mq); 27098ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman 27198ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman mmc_queue_bounce_pre(mq); 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 273b41e9c7b8e14ea57aa0fc05fd63a0de0e935d58dPierre Ossman /* 274b41e9c7b8e14ea57aa0fc05fd63a0de0e935d58dPierre Ossman * Adjust the sg list so it is the same size as the 275b41e9c7b8e14ea57aa0fc05fd63a0de0e935d58dPierre Ossman * request. 276b41e9c7b8e14ea57aa0fc05fd63a0de0e935d58dPierre Ossman */ 27714d836e7499c53a1f6a65086c3d11600e871a971Alex Dubov if (brq.data.blocks != 27814d836e7499c53a1f6a65086c3d11600e871a971Alex Dubov (req->nr_sectors >> (md->block_bits - 9))) { 27914d836e7499c53a1f6a65086c3d11600e871a971Alex Dubov data_size = brq.data.blocks * brq.data.blksz; 280b41e9c7b8e14ea57aa0fc05fd63a0de0e935d58dPierre Ossman for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) { 281b41e9c7b8e14ea57aa0fc05fd63a0de0e935d58dPierre Ossman data_size -= sg->length; 28214d836e7499c53a1f6a65086c3d11600e871a971Alex Dubov if (data_size <= 0) { 283b41e9c7b8e14ea57aa0fc05fd63a0de0e935d58dPierre Ossman sg->length += data_size; 284b41e9c7b8e14ea57aa0fc05fd63a0de0e935d58dPierre Ossman i++; 28514d836e7499c53a1f6a65086c3d11600e871a971Alex Dubov break; 28614d836e7499c53a1f6a65086c3d11600e871a971Alex Dubov } 28714d836e7499c53a1f6a65086c3d11600e871a971Alex Dubov } 288b41e9c7b8e14ea57aa0fc05fd63a0de0e935d58dPierre Ossman brq.data.sg_len = i; 28914d836e7499c53a1f6a65086c3d11600e871a971Alex Dubov } 29014d836e7499c53a1f6a65086c3d11600e871a971Alex Dubov 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mmc_wait_for_req(card->host, &brq.mrq); 29298ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman 29398ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman mmc_queue_bounce_post(mq); 29498ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman 295979ce7208a679b8d012450610d5d5aa75aab3af9Pierre Ossman /* 296979ce7208a679b8d012450610d5d5aa75aab3af9Pierre Ossman * Check for errors here, but don't jump to cmd_err 297979ce7208a679b8d012450610d5d5aa75aab3af9Pierre Ossman * until later as we need to wait for the card to leave 298979ce7208a679b8d012450610d5d5aa75aab3af9Pierre Ossman * programming mode even when things go wrong. 299979ce7208a679b8d012450610d5d5aa75aab3af9Pierre Ossman */ 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (brq.cmd.error) { 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "%s: error %d sending read/write command\n", 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds req->rq_disk->disk_name, brq.cmd.error); 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (brq.data.error) { 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "%s: error %d transferring data\n", 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds req->rq_disk->disk_name, brq.data.error); 3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (brq.stop.error) { 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "%s: error %d sending stop command\n", 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds req->rq_disk->disk_name, brq.stop.error); 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3157213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) { 3162ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King do { 3172ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King int err; 3182ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King 3192ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King cmd.opcode = MMC_SEND_STATUS; 3202ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King cmd.arg = card->rca << 16; 3212ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; 3222ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King err = mmc_wait_for_cmd(card->host, &cmd, 5); 3232ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King if (err) { 3242ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King printk(KERN_ERR "%s: error %d requesting status\n", 3252ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King req->rq_disk->disk_name, err); 3262ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King goto cmd_err; 3272ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King } 328d198f101989d9bb950327f0d043f6203bb862343Pierre Ossman /* 329d198f101989d9bb950327f0d043f6203bb862343Pierre Ossman * Some cards mishandle the status bits, 330d198f101989d9bb950327f0d043f6203bb862343Pierre Ossman * so make sure to check both the busy 331d198f101989d9bb950327f0d043f6203bb862343Pierre Ossman * indication and the card state. 332d198f101989d9bb950327f0d043f6203bb862343Pierre Ossman */ 333d198f101989d9bb950327f0d043f6203bb862343Pierre Ossman } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || 334d198f101989d9bb950327f0d043f6203bb862343Pierre Ossman (R1_CURRENT_STATE(cmd.resp[0]) == 7)); 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#if 0 3372ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King if (cmd.resp[0] & ~0x00000900) 3382ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King printk(KERN_ERR "%s: status = %08x\n", 3392ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King req->rq_disk->disk_name, cmd.resp[0]); 3402ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King if (mmc_decode_status(cmd.resp)) 3412ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King goto cmd_err; 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 3432ed6d22cec37d9a3df4c5bacf1160dee7700106eRussell King } 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 345979ce7208a679b8d012450610d5d5aa75aab3af9Pierre Ossman if (brq.cmd.error || brq.data.error || brq.stop.error) 346979ce7208a679b8d012450610d5d5aa75aab3af9Pierre Ossman goto cmd_err; 347979ce7208a679b8d012450610d5d5aa75aab3af9Pierre Ossman 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * A block was successfully transferred. 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&md->lock); 352fd539832c7d3a242269374dbcae2cd54da150930Kiyoshi Ueda ret = __blk_end_request(req, 0, brq.data.bytes_xfered); 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&md->lock); 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } while (ret); 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 356b855885e3b60cf6f9452848712a62517b94583ebPierre Ossman mmc_release_host(card->host); 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 1; 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmd_err: 361ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman /* 362ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman * If this is an SD card and we're writing, we can first 363ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman * mark the known good sectors as ok. 364ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman * 365ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman * If the card is not SD, we can still ok written sectors 36623af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman * as reported by the controller (which might be less than 36723af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman * the real number of written sectors, but never more). 368176f00ffed3ef94a198326fbf6a5db64f1cf73adPierre Ossman * 369176f00ffed3ef94a198326fbf6a5db64f1cf73adPierre Ossman * For reads we just fail the entire chunk as that should 370176f00ffed3ef94a198326fbf6a5db64f1cf73adPierre Ossman * be safe in all cases. 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 37223af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman if (rq_data_dir(req) != READ) { 37323af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman if (mmc_card_sd(card)) { 37423af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman u32 blocks; 37523af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman unsigned int bytes; 37623af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman 37723af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman blocks = mmc_sd_num_wr_blocks(card); 37823af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman if (blocks != (u32)-1) { 37923af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman if (card->csd.write_partial) 38023af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman bytes = blocks << md->block_bits; 38123af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman else 38223af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman bytes = blocks << 9; 38323af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman spin_lock_irq(&md->lock); 38423af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman ret = __blk_end_request(req, 0, bytes); 38523af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman spin_unlock_irq(&md->lock); 38623af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman } 38723af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman } else { 388ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman spin_lock_irq(&md->lock); 38923af60398af2f5033e2f53665538a09f498dbc03Pierre Ossman ret = __blk_end_request(req, 0, brq.data.bytes_xfered); 390ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman spin_unlock_irq(&md->lock); 391ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman } 392176f00ffed3ef94a198326fbf6a5db64f1cf73adPierre Ossman } 393176f00ffed3ef94a198326fbf6a5db64f1cf73adPierre Ossman 394b855885e3b60cf6f9452848712a62517b94583ebPierre Ossman mmc_release_host(card->host); 395ec5a19dd935eb3793e1f6ed491e8035b3d7b1df9Pierre Ossman 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&md->lock); 397fd539832c7d3a242269374dbcae2cd54da150930Kiyoshi Ueda while (ret) 398fd539832c7d3a242269374dbcae2cd54da150930Kiyoshi Ueda ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req)); 3991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&md->lock); 4001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 4021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 405a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell Kingstatic inline int mmc_blk_readonly(struct mmc_card *card) 406a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King{ 407a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King return mmc_card_readonly(card) || 408a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King !(card->csd.cmdclass & CCC_BLOCK_WRITE); 409a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King} 410a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King 4111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_blk_data *md; 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int devidx, ret; 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS); 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (devidx >= MMC_NUM_MINORS) 4181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ERR_PTR(-ENOSPC); 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds __set_bit(devidx, dev_use); 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 421dd00cc486ab1c17049a535413d1751ef3482141cYoann Padioleau md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL); 422a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King if (!md) { 423a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King ret = -ENOMEM; 424a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King goto out; 425a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King } 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 428a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King /* 429a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King * Set the read-only status based on the supported commands 430a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King * and the write protect switch. 431a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King */ 432a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King md->read_only = mmc_blk_readonly(card); 4331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 434a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King /* 4356fe9febb8af2f82f9caace1aa1c00cd8de7469acPierre Ossman * Both SD and MMC specifications state (although a bit 4366fe9febb8af2f82f9caace1aa1c00cd8de7469acPierre Ossman * unclearly in the MMC case) that a block size of 512 4376fe9febb8af2f82f9caace1aa1c00cd8de7469acPierre Ossman * bytes must always be supported by the card. 438a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King */ 4396fe9febb8af2f82f9caace1aa1c00cd8de7469acPierre Ossman md->block_bits = 9; 4401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 441a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King md->disk = alloc_disk(1 << MMC_SHIFT); 442a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King if (md->disk == NULL) { 443a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King ret = -ENOMEM; 444a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King goto err_kfree; 445a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King } 4461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 447a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King spin_lock_init(&md->lock); 448a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King md->usage = 1; 4491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 450a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King ret = mmc_init_queue(&md->queue, card, &md->lock); 451a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King if (ret) 452a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King goto err_putdisk; 4531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 454a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King md->queue.issue_fn = mmc_blk_issue_rq; 455a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King md->queue.data = md; 456d2b18394259ef621fd2a6322aa9934198fd87a6aRussell King 457fe6b4c8840c5e23fe9b8696450cee8f2e8cebffdPierre Ossman md->disk->major = MMC_BLOCK_MAJOR; 458a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King md->disk->first_minor = devidx << MMC_SHIFT; 459a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King md->disk->fops = &mmc_bdops; 460a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King md->disk->private_data = md; 461a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King md->disk->queue = md->queue.queue; 462a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King md->disk->driverfs_dev = &card->dev; 463a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King 464a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King /* 465a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King * As discussed on lkml, GENHD_FL_REMOVABLE should: 466a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King * 467a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King * - be set for removable media with permanent block devices 468a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King * - be unset for removable block devices with permanent media 469a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King * 470a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King * Since MMC block devices clearly fall under the second 471a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King * case, we do not set GENHD_FL_REMOVABLE. Userspace 472a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King * should use the block device creation/destruction hotplug 473a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King * messages to tell when the card is present. 474a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King */ 475a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King 476a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King sprintf(md->disk->disk_name, "mmcblk%d", devidx); 477a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King 478a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits); 479a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King 48085a18ad93ec66888d85758630019b10a84257f3cPierre Ossman if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) { 48185a18ad93ec66888d85758630019b10a84257f3cPierre Ossman /* 48285a18ad93ec66888d85758630019b10a84257f3cPierre Ossman * The EXT_CSD sector count is in number or 512 byte 48385a18ad93ec66888d85758630019b10a84257f3cPierre Ossman * sectors. 48485a18ad93ec66888d85758630019b10a84257f3cPierre Ossman */ 48585a18ad93ec66888d85758630019b10a84257f3cPierre Ossman set_capacity(md->disk, card->ext_csd.sectors); 48685a18ad93ec66888d85758630019b10a84257f3cPierre Ossman } else { 48785a18ad93ec66888d85758630019b10a84257f3cPierre Ossman /* 48885a18ad93ec66888d85758630019b10a84257f3cPierre Ossman * The CSD capacity field is in units of read_blkbits. 48985a18ad93ec66888d85758630019b10a84257f3cPierre Ossman * set_capacity takes units of 512 bytes. 49085a18ad93ec66888d85758630019b10a84257f3cPierre Ossman */ 49185a18ad93ec66888d85758630019b10a84257f3cPierre Ossman set_capacity(md->disk, 49285a18ad93ec66888d85758630019b10a84257f3cPierre Ossman card->csd.capacity << (card->csd.read_blkbits - 9)); 49385a18ad93ec66888d85758630019b10a84257f3cPierre Ossman } 4941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return md; 495a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King 496a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King err_putdisk: 497a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King put_disk(md->disk); 498a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King err_kfree: 499a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King kfree(md); 500a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King out: 501a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2ccRussell King return ERR_PTR(ret); 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card) 5061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_command cmd; 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int err; 5091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 510fba68bd2dab1ac99af3c5a963ec9581cfa9f1725Philip Langdale /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */ 511fba68bd2dab1ac99af3c5a963ec9581cfa9f1725Philip Langdale if (mmc_card_blockaddr(card)) 512fba68bd2dab1ac99af3c5a963ec9581cfa9f1725Philip Langdale return 0; 513fba68bd2dab1ac99af3c5a963ec9581cfa9f1725Philip Langdale 514b855885e3b60cf6f9452848712a62517b94583ebPierre Ossman mmc_claim_host(card->host); 5151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmd.opcode = MMC_SET_BLOCKLEN; 516d2b18394259ef621fd2a6322aa9934198fd87a6aRussell King cmd.arg = 1 << md->block_bits; 5177213d175e3b6f6db60f843b72e88857a350e146aDavid Brownell cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; 5181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds err = mmc_wait_for_cmd(card->host, &cmd, 5); 519b855885e3b60cf6f9452848712a62517b94583ebPierre Ossman mmc_release_host(card->host); 5201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (err) { 5221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "%s: unable to set block size to %d: %d\n", 5231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds md->disk->disk_name, cmd.arg, err); 5241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 5251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 5281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mmc_blk_probe(struct mmc_card *card) 5311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_blk_data *md; 5331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int err; 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 535912490db699d83cb3d03570b63df7448677a3f56Pierre Ossman /* 536912490db699d83cb3d03570b63df7448677a3f56Pierre Ossman * Check that the card supports the command class(es) we need. 537912490db699d83cb3d03570b63df7448677a3f56Pierre Ossman */ 538912490db699d83cb3d03570b63df7448677a3f56Pierre Ossman if (!(card->csd.cmdclass & CCC_BLOCK_READ)) 5391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENODEV; 5401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds md = mmc_blk_alloc(card); 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (IS_ERR(md)) 5431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return PTR_ERR(md); 5441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds err = mmc_blk_set_blksize(md, card); 5461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (err) 5471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 5481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 54951828abc17a4ae0f7fb3879e00a30da7bdc7ca20Andrew Morton printk(KERN_INFO "%s: %s %s %lluKiB %s\n", 5501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), 55151828abc17a4ae0f7fb3879e00a30da7bdc7ca20Andrew Morton (unsigned long long)(get_capacity(md->disk) >> 1), 55251828abc17a4ae0f7fb3879e00a30da7bdc7ca20Andrew Morton md->read_only ? "(ro)" : ""); 5531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mmc_set_drvdata(card, md); 5551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds add_disk(md->disk); 5561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 5571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 5591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mmc_blk_put(md); 5601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return err; 5621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void mmc_blk_remove(struct mmc_card *card) 5651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_blk_data *md = mmc_get_drvdata(card); 5671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (md) { 56989b4e133afea9fce333054b94d89953583a55c19Pierre Ossman /* Stop new requests from getting into the queue */ 5701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds del_gendisk(md->disk); 5711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 57289b4e133afea9fce333054b94d89953583a55c19Pierre Ossman /* Then flush out any already in there */ 57389b4e133afea9fce333054b94d89953583a55c19Pierre Ossman mmc_cleanup_queue(&md->queue); 5741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mmc_blk_put(md); 5761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mmc_set_drvdata(card, NULL); 5781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_PM 5811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mmc_blk_suspend(struct mmc_card *card, pm_message_t state) 5821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_blk_data *md = mmc_get_drvdata(card); 5841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (md) { 5861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mmc_queue_suspend(&md->queue); 5871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 5891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mmc_blk_resume(struct mmc_card *card) 5921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mmc_blk_data *md = mmc_get_drvdata(card); 5941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (md) { 5961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mmc_blk_set_blksize(md, card); 5971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mmc_queue_resume(&md->queue); 5981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 6001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 6021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define mmc_blk_suspend NULL 6031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define mmc_blk_resume NULL 6041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 6051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct mmc_driver mmc_driver = { 6071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .drv = { 6081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .name = "mmcblk", 6091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds }, 6101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .probe = mmc_blk_probe, 6111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .remove = mmc_blk_remove, 6121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .suspend = mmc_blk_suspend, 6131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .resume = mmc_blk_resume, 6141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 6151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init mmc_blk_init(void) 6171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6189d4e98e9609bc19d4a8ac4a5c3218358d1820114Akinobu Mita int res; 6191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 620fe6b4c8840c5e23fe9b8696450cee8f2e8cebffdPierre Ossman res = register_blkdev(MMC_BLOCK_MAJOR, "mmc"); 621fe6b4c8840c5e23fe9b8696450cee8f2e8cebffdPierre Ossman if (res) 6221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 6231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6249d4e98e9609bc19d4a8ac4a5c3218358d1820114Akinobu Mita res = mmc_register_driver(&mmc_driver); 6259d4e98e9609bc19d4a8ac4a5c3218358d1820114Akinobu Mita if (res) 6269d4e98e9609bc19d4a8ac4a5c3218358d1820114Akinobu Mita goto out2; 6271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6289d4e98e9609bc19d4a8ac4a5c3218358d1820114Akinobu Mita return 0; 6299d4e98e9609bc19d4a8ac4a5c3218358d1820114Akinobu Mita out2: 6309d4e98e9609bc19d4a8ac4a5c3218358d1820114Akinobu Mita unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); 6311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 6321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return res; 6331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void __exit mmc_blk_exit(void) 6361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mmc_unregister_driver(&mmc_driver); 638fe6b4c8840c5e23fe9b8696450cee8f2e8cebffdPierre Ossman unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); 6391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_init(mmc_blk_init); 6421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_exit(mmc_blk_exit); 6431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 6451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_DESCRIPTION("Multimedia Card (MMC) block device driver"); 6461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 647