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         BUG_ON(!host);
  28
  29         memset(&cmd, 0, sizeof(struct mmc_command));
  30
  31         cmd.opcode = SD_IO_SEND_OP_COND;
  32         cmd.arg = ocr;
  33         cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR;
  34
  35         for (i = 100; i; i--) {
  36                 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
  37                 if (err)
  38                         break;
  39
  40                 /* if we're just probing, do a single pass */
  41                 if (ocr == 0)
  42                         break;
  43
  44                 /* otherwise wait until reset completes */
  45                 if (mmc_host_is_spi(host)) {
  46                         /*
  47                          * Both R1_SPI_IDLE and MMC_CARD_BUSY indicate
  48                          * an initialized card under SPI, but some cards
  49                          * (Marvell's) only behave when looking at this
  50                          * one.
  51                          */
  52                         if (cmd.resp[1] & MMC_CARD_BUSY)
  53                                 break;
  54                 } else {
  55                         if (cmd.resp[0] & MMC_CARD_BUSY)
  56                                 break;
  57                 }
  58
  59                 err = -ETIMEDOUT;
  60
  61                 mmc_delay(10);
  62         }
  63
  64         if (rocr)
  65                 *rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0];
  66
  67         return err;
  68 }
  69
  70 static int mmc_io_rw_direct_host(struct mmc_host *host, int write, unsigned fn,
  71         unsigned addr, u8 in, u8 *out)
  72 {
  73         struct mmc_command cmd;
  74         int err;
  75
  76         BUG_ON(!host);
  77         BUG_ON(fn > 7);
  78
  79         /* sanity check */
  80         if (addr & ~0x1FFFF)
  81                 return -EINVAL;
  82
  83         memset(&cmd, 0, sizeof(struct mmc_command));
  84
  85         cmd.opcode = SD_IO_RW_DIRECT;
  86         cmd.arg = write ? 0x80000000 : 0x00000000;
  87         cmd.arg |= fn << 28;
  88         cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
  89         cmd.arg |= addr << 9;
  90         cmd.arg |= in;
  91         cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
  92
  93         err = mmc_wait_for_cmd(host, &cmd, 0);
  94         if (err)
  95                 return err;
  96
  97         if (mmc_host_is_spi(host)) {
  98                 /* host driver already reported errors */
  99         } else {
 100                 if (cmd.resp[0] & R5_ERROR)
 101                         return -EIO;
 102                 if (cmd.resp[0] & R5_FUNCTION_NUMBER)
 103                         return -EINVAL;
 104                 if (cmd.resp[0] & R5_OUT_OF_RANGE)
 105                         return -ERANGE;
 106         }
 107
 108         if (out) {
 109                 if (mmc_host_is_spi(host))
 110                         *out = (cmd.resp[0] >> 8) & 0xFF;
 111                 else
 112                         *out = cmd.resp[0] & 0xFF;
 113         }
 114
 115         return 0;
 116 }
 117
 118 int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
 119         unsigned addr, u8 in, u8 *out)
 120 {
 121         BUG_ON(!card);
 122         return mmc_io_rw_direct_host(card->host, write, fn, addr, in, out);
 123 }
 124
 125 int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
 126         unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz)
 127 {
 128         struct mmc_request mrq;
 129         struct mmc_command cmd;
 130         struct mmc_data data;
 131         struct scatterlist sg;
 132
 133         BUG_ON(!card);
 134         BUG_ON(fn > 7);
 135         BUG_ON(blocks == 1 && blksz > 512);
 136         WARN_ON(blocks == 0);
 137         WARN_ON(blksz == 0);
 138
 139         /* sanity check */
 140         if (addr & ~0x1FFFF)
 141                 return -EINVAL;
 142
 143         memset(&mrq, 0, sizeof(struct mmc_request));
 144         memset(&cmd, 0, sizeof(struct mmc_command));
 145         memset(&data, 0, sizeof(struct mmc_data));
 146
 147         mrq.cmd = &cmd;
 148         mrq.data = &data;
 149
 150         cmd.opcode = SD_IO_RW_EXTENDED;
 151         cmd.arg = write ? 0x80000000 : 0x00000000;
 152         cmd.arg |= fn << 28;
 153         cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
 154         cmd.arg |= addr << 9;
 155         if (blocks == 1 && blksz <= 512)
 156                 cmd.arg |= (blksz == 512) ? 0 : blksz;  /* byte mode */
 157         else
 158                 cmd.arg |= 0x08000000 | blocks;         /* block mode */
 159         cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
 160
 161         data.blksz = blksz;
 162         data.blocks = blocks;
 163         data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
 164         data.sg = &sg;
 165         data.sg_len = 1;
 166
 167         sg_init_one(&sg, buf, blksz * blocks);
 168
 169         mmc_set_data_timeout(&data, card);
 170
 171         mmc_wait_for_req(card->host, &mrq);
 172
 173         if (cmd.error)
 174                 return cmd.error;
 175         if (data.error)
 176                 return data.error;
 177
 178         if (mmc_host_is_spi(card->host)) {
 179                 /* host driver already reported errors */
 180         } else {
 181                 if (cmd.resp[0] & R5_ERROR)
 182                         return -EIO;
 183                 if (cmd.resp[0] & R5_FUNCTION_NUMBER)
 184                         return -EINVAL;
 185                 if (cmd.resp[0] & R5_OUT_OF_RANGE)
 186                         return -ERANGE;
 187         }
 188
 189         return 0;
 190 }
 191
 192 int sdio_reset(struct mmc_host *host)
 193 {
 194         int ret;
 195         u8 abort;
 196
 197         /* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */
 198
 199         ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort);
 200         if (ret)
 201                 abort = 0x08;
 202         else
 203                 abort |= 0x08;
 204
 205         ret = mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL);
 206         return ret;
 207 }
 208