1 /* 2 * linux/drivers/mmc/sdio_ops.c 3 * 4 * Copyright 2006-2007 Pierre Ossman 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or (at 9 * your option) any later version. 10 */ 11 12 #include <linux/scatterlist.h> 13 14 #include <linux/mmc/host.h> 15 #include <linux/mmc/card.h> 16 #include <linux/mmc/mmc.h> 17 #include <linux/mmc/sdio.h> 18 19 #include "core.h" 20 #include "sdio_ops.h" 21 22 int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) 23 { 24 struct mmc_command cmd = {}; 25 int i, err = 0; 26 27 cmd.opcode = SD_IO_SEND_OP_COND; 28 cmd.arg = ocr; 29 cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR; 30 31 for (i = 100; i; i--) { 32 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); 33 if (err) 34 break; 35 36 /* if we're just probing, do a single pass */ 37 if (ocr == 0) 38 break; 39 40 /* otherwise wait until reset completes */ 41 if (mmc_host_is_spi(host)) { 42 /* 43 * Both R1_SPI_IDLE and MMC_CARD_BUSY indicate 44 * an initialized card under SPI, but some cards 45 * (Marvell's) only behave when looking at this 46 * one. 47 */ 48 if (cmd.resp[1] & MMC_CARD_BUSY) 49 break; 50 } else { 51 if (cmd.resp[0] & MMC_CARD_BUSY) 52 break; 53 } 54 55 err = -ETIMEDOUT; 56 57 mmc_delay(10); 58 } 59 60 if (rocr) 61 *rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0]; 62 63 return err; 64 } 65 66 static int mmc_io_rw_direct_host(struct mmc_host *host, int write, unsigned fn, 67 unsigned addr, u8 in, u8 *out) 68 { 69 struct mmc_command cmd = {}; 70 int err; 71 72 if (fn > 7) 73 return -EINVAL; 74 75 /* sanity check */ 76 if (addr & ~0x1FFFF) 77 return -EINVAL; 78 79 cmd.opcode = SD_IO_RW_DIRECT; 80 cmd.arg = write ? 0x80000000 : 0x00000000; 81 cmd.arg |= fn << 28; 82 cmd.arg |= (write && out) ? 0x08000000 : 0x00000000; 83 cmd.arg |= addr << 9; 84 cmd.arg |= in; 85 cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC; 86 87 err = mmc_wait_for_cmd(host, &cmd, 0); 88 if (err) 89 return err; 90 91 if (mmc_host_is_spi(host)) { 92 /* host driver already reported errors */ 93 } else { 94 if (cmd.resp[0] & R5_ERROR) 95 return -EIO; 96 if (cmd.resp[0] & R5_FUNCTION_NUMBER) 97 return -EINVAL; 98 if (cmd.resp[0] & R5_OUT_OF_RANGE) 99 return -ERANGE; 100 } 101 102 if (out) { 103 if (mmc_host_is_spi(host)) 104 *out = (cmd.resp[0] >> 8) & 0xFF; 105 else 106 *out = cmd.resp[0] & 0xFF; 107 } 108 109 return 0; 110 } 111 112 int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn, 113 unsigned addr, u8 in, u8 *out) 114 { 115 return mmc_io_rw_direct_host(card->host, write, fn, addr, in, out); 116 } 117 118 int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn, 119 unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz) 120 { 121 struct mmc_request mrq = {}; 122 struct mmc_command cmd = {}; 123 struct mmc_data data = {}; 124 struct scatterlist sg, *sg_ptr; 125 struct sg_table sgtable; 126 unsigned int nents, left_size, i; 127 unsigned int seg_size = card->host->max_seg_size; 128 129 WARN_ON(blksz == 0); 130 131 /* sanity check */ 132 if (addr & ~0x1FFFF) 133 return -EINVAL; 134 135 mrq.cmd = &cmd; 136 mrq.data = &data; 137 138 cmd.opcode = SD_IO_RW_EXTENDED; 139 cmd.arg = write ? 0x80000000 : 0x00000000; 140 cmd.arg |= fn << 28; 141 cmd.arg |= incr_addr ? 0x04000000 : 0x00000000; 142 cmd.arg |= addr << 9; 143 if (blocks == 0) 144 cmd.arg |= (blksz == 512) ? 0 : blksz; /* byte mode */ 145 else 146 cmd.arg |= 0x08000000 | blocks; /* block mode */ 147 cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC; 148 149 data.blksz = blksz; 150 /* Code in host drivers/fwk assumes that "blocks" always is >=1 */ 151 data.blocks = blocks ? blocks : 1; 152 data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ; 153 154 left_size = data.blksz * data.blocks; 155 nents = DIV_ROUND_UP(left_size, seg_size); 156 if (nents > 1) { 157 if (sg_alloc_table(&sgtable, nents, GFP_KERNEL)) 158 return -ENOMEM; 159 160 data.sg = sgtable.sgl; 161 data.sg_len = nents; 162 163 for_each_sg(data.sg, sg_ptr, data.sg_len, i) { 164 sg_set_buf(sg_ptr, buf + i * seg_size, 165 min(seg_size, left_size)); 166 left_size -= seg_size; 167 } 168 } else { 169 data.sg = &sg; 170 data.sg_len = 1; 171 172 sg_init_one(&sg, buf, left_size); 173 } 174 175 mmc_set_data_timeout(&data, card); 176 177 mmc_wait_for_req(card->host, &mrq); 178 179 if (nents > 1) 180 sg_free_table(&sgtable); 181 182 if (cmd.error) 183 return cmd.error; 184 if (data.error) 185 return data.error; 186 187 if (mmc_host_is_spi(card->host)) { 188 /* host driver already reported errors */ 189 } else { 190 if (cmd.resp[0] & R5_ERROR) 191 return -EIO; 192 if (cmd.resp[0] & R5_FUNCTION_NUMBER) 193 return -EINVAL; 194 if (cmd.resp[0] & R5_OUT_OF_RANGE) 195 return -ERANGE; 196 } 197 198 return 0; 199 } 200 201 int sdio_reset(struct mmc_host *host) 202 { 203 int ret; 204 u8 abort; 205 206 /* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */ 207 208 ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort); 209 if (ret) 210 abort = 0x08; 211 else 212 abort |= 0x08; 213 214 return mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL); 215 } 216 217