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 = {0};
  25         int i, err = 0;
  26
  27         BUG_ON(!host);
  28
  29         cmd.opcode = SD_IO_SEND_OP_COND;
  30         cmd.arg = ocr;
  31         cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR;
  32
  33         for (i = 100; i; i--) {
  34                 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
  35                 if (err)
  36                         break;
  37
  38                 /* if we're just probing, do a single pass */
  39                 if (ocr == 0)
  40                         break;
  41
  42                 /* otherwise wait until reset completes */
  43                 if (mmc_host_is_spi(host)) {
  44                         /*
  45                          * Both R1_SPI_IDLE and MMC_CARD_BUSY indicate
  46                          * an initialized card under SPI, but some cards
  47                          * (Marvell's) only behave when looking at this
  48                          * one.
  49                          */
  50                         if (cmd.resp[1] & MMC_CARD_BUSY)
  51                                 break;
  52                 } else {
  53                         if (cmd.resp[0] & MMC_CARD_BUSY)
  54                                 break;
  55                 }
  56
  57                 err = -ETIMEDOUT;
  58
  59                 mmc_delay(10);
  60         }
  61
  62         if (rocr)
  63                 *rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0];
  64
  65         return err;
  66 }
  67
  68 static int mmc_io_rw_direct_host(struct mmc_host *host, int write, unsigned fn,
  69         unsigned addr, u8 in, u8 *out)
  70 {
  71         struct mmc_command cmd = {0};
  72         int err;
  73
  74         BUG_ON(!host);
  75         BUG_ON(fn > 7);
  76
  77         /* sanity check */
  78         if (addr & ~0x1FFFF)
  79                 return -EINVAL;
  80
  81         cmd.opcode = SD_IO_RW_DIRECT;
  82         cmd.arg = write ? 0x80000000 : 0x00000000;
  83         cmd.arg |= fn << 28;
  84         cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
  85         cmd.arg |= addr << 9;
  86         cmd.arg |= in;
  87         cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
  88
  89         err = mmc_wait_for_cmd(host, &cmd, 0);
  90         if (err)
  91                 return err;
  92
  93         if (mmc_host_is_spi(host)) {
  94                 /* host driver already reported errors */
  95         } else {
  96                 if (cmd.resp[0] & R5_ERROR)
  97                         return -EIO;
  98                 if (cmd.resp[0] & R5_FUNCTION_NUMBER)
  99                         return -EINVAL;
 100                 if (cmd.resp[0] & R5_OUT_OF_RANGE)
 101                         return -ERANGE;
 102         }
 103
 104         if (out) {
 105                 if (mmc_host_is_spi(host))
 106                         *out = (cmd.resp[0] >> 8) & 0xFF;
 107                 else
 108                         *out = cmd.resp[0] & 0xFF;
 109         }
 110
 111         return 0;
 112 }
 113
 114 int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
 115         unsigned addr, u8 in, u8 *out)
 116 {
 117         BUG_ON(!card);
 118         return mmc_io_rw_direct_host(card->host, write, fn, addr, in, out);
 119 }
 120
 121 int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
 122         unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz)
 123 {
 124         struct mmc_request mrq = {NULL};
 125         struct mmc_command cmd = {0};
 126         struct mmc_data data = {0};
 127         struct scatterlist sg;
 128
 129         BUG_ON(!card);
 130         BUG_ON(fn > 7);
 131         WARN_ON(blksz == 0);
 132
 133         /* sanity check */
 134         if (addr & ~0x1FFFF)
 135                 return -EINVAL;
 136
 137         mrq.cmd = &cmd;
 138         mrq.data = &data;
 139
 140         cmd.opcode = SD_IO_RW_EXTENDED;
 141         cmd.arg = write ? 0x80000000 : 0x00000000;
 142         cmd.arg |= fn << 28;
 143         cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
 144         cmd.arg |= addr << 9;
 145         if (blocks == 0)
 146                 cmd.arg |= (blksz == 512) ? 0 : blksz;  /* byte mode */
 147         else
 148                 cmd.arg |= 0x08000000 | blocks;         /* block mode */
 149         cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
 150
 151         data.blksz = blksz;
 152         /* Code in host drivers/fwk assumes that "blocks" always is >=1 */
 153         data.blocks = blocks ? blocks : 1;
 154         data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
 155         data.sg = &sg;
 156         data.sg_len = 1;
 157
 158         sg_init_one(&sg, buf, data.blksz * data.blocks);
 159
 160         mmc_set_data_timeout(&data, card);
 161
 162         mmc_wait_for_req(card->host, &mrq);
 163
 164         if (cmd.error)
 165                 return cmd.error;
 166         if (data.error)
 167                 return data.error;
 168
 169         if (mmc_host_is_spi(card->host)) {
 170                 /* host driver already reported errors */
 171         } else {
 172                 if (cmd.resp[0] & R5_ERROR)
 173                         return -EIO;
 174                 if (cmd.resp[0] & R5_FUNCTION_NUMBER)
 175                         return -EINVAL;
 176                 if (cmd.resp[0] & R5_OUT_OF_RANGE)
 177                         return -ERANGE;
 178         }
 179
 180         return 0;
 181 }
 182
 183 int sdio_reset(struct mmc_host *host)
 184 {
 185         int ret;
 186         u8 abort;
 187
 188         /* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */
 189
 190         ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort);
 191         if (ret)
 192                 abort = 0x08;
 193         else
 194                 abort |= 0x08;
 195
 196         ret = mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL);
 197         return ret;
 198 }
 199