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, *sg_ptr;
 128         struct sg_table sgtable;
 129         unsigned int nents, left_size, i;
 130         unsigned int seg_size = card->host->max_seg_size;
 131
 132         BUG_ON(!card);
 133         BUG_ON(fn > 7);
 134         WARN_ON(blksz == 0);
 135
 136         /* sanity check */
 137         if (addr & ~0x1FFFF)
 138                 return -EINVAL;
 139
 140         mrq.cmd = &cmd;
 141         mrq.data = &data;
 142
 143         cmd.opcode = SD_IO_RW_EXTENDED;
 144         cmd.arg = write ? 0x80000000 : 0x00000000;
 145         cmd.arg |= fn << 28;
 146         cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
 147         cmd.arg |= addr << 9;
 148         if (blocks == 0)
 149                 cmd.arg |= (blksz == 512) ? 0 : blksz;  /* byte mode */
 150         else
 151                 cmd.arg |= 0x08000000 | blocks;         /* block mode */
 152         cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
 153
 154         data.blksz = blksz;
 155         /* Code in host drivers/fwk assumes that "blocks" always is >=1 */
 156         data.blocks = blocks ? blocks : 1;
 157         data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
 158
 159         left_size = data.blksz * data.blocks;
 160         nents = (left_size - 1) / seg_size + 1;
 161         if (nents > 1) {
 162                 if (sg_alloc_table(&sgtable, nents, GFP_KERNEL))
 163                         return -ENOMEM;
 164
 165                 data.sg = sgtable.sgl;
 166                 data.sg_len = nents;
 167
 168                 for_each_sg(data.sg, sg_ptr, data.sg_len, i) {
 169                         sg_set_page(sg_ptr, virt_to_page(buf + (i * seg_size)),
 170                                         min(seg_size, left_size),
 171                                         offset_in_page(buf + (i * seg_size)));
 172                         left_size = left_size - seg_size;
 173                 }
 174         } else {
 175                 data.sg = &sg;
 176                 data.sg_len = 1;
 177
 178                 sg_init_one(&sg, buf, left_size);
 179         }
 180
 181         mmc_set_data_timeout(&data, card);
 182
 183         mmc_wait_for_req(card->host, &mrq);
 184
 185         if (nents > 1)
 186                 sg_free_table(&sgtable);
 187
 188         if (cmd.error)
 189                 return cmd.error;
 190         if (data.error)
 191                 return data.error;
 192
 193         if (mmc_host_is_spi(card->host)) {
 194                 /* host driver already reported errors */
 195         } else {
 196                 if (cmd.resp[0] & R5_ERROR)
 197                         return -EIO;
 198                 if (cmd.resp[0] & R5_FUNCTION_NUMBER)
 199                         return -EINVAL;
 200                 if (cmd.resp[0] & R5_OUT_OF_RANGE)
 201                         return -ERANGE;
 202         }
 203
 204         return 0;
 205 }
 206
 207 int sdio_reset(struct mmc_host *host)
 208 {
 209         int ret;
 210         u8 abort;
 211
 212         /* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */
 213
 214         ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort);
 215         if (ret)
 216                 abort = 0x08;
 217         else
 218                 abort |= 0x08;
 219
 220         ret = mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL);
 221         return ret;
 222 }
 223