drivers/mmc/core/sdio_ops.c

   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