drivers/mmc/core/sdio

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
mmc_send_io_op_cond
mmc_io_rw_direct_host
mmc_io_rw_direct
mmc_io_rw_extended
sdio_reset
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  linux/drivers/mmc/sdio_ops.c
   4  *
   5  *  Copyright 2006-2007 Pierre Ossman
   6  */
   7 
   8 #include <linux/scatterlist.h>
   9 
  10 #include <linux/mmc/host.h>
  11 #include <linux/mmc/card.h>
  12 #include <linux/mmc/mmc.h>
  13 #include <linux/mmc/sdio.h>
  14 
  15 #include "core.h"
  16 #include "sdio_ops.h"
  17 
  18 int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
  19 {
  20         struct mmc_command cmd = {};
  21         int i, err = 0;
  22 
  23         cmd.opcode = SD_IO_SEND_OP_COND;
  24         cmd.arg = ocr;
  25         cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR;
  26 
  27         for (i = 100; i; i--) {
  28                 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
  29                 if (err)
  30                         break;
  31 
  32                 /* if we're just probing, do a single pass */
  33                 if (ocr == 0)
  34                         break;
  35 
  36                 /* otherwise wait until reset completes */
  37                 if (mmc_host_is_spi(host)) {
  38                         /*
  39                          * Both R1_SPI_IDLE and MMC_CARD_BUSY indicate
  40                          * an initialized card under SPI, but some cards
  41                          * (Marvell's) only behave when looking at this
  42                          * one.
  43                          */
  44                         if (cmd.resp[1] & MMC_CARD_BUSY)
  45                                 break;
  46                 } else {
  47                         if (cmd.resp[0] & MMC_CARD_BUSY)
  48                                 break;
  49                 }
  50 
  51                 err = -ETIMEDOUT;
  52 
  53                 mmc_delay(10);
  54         }
  55 
  56         if (rocr)
  57                 *rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0];
  58 
  59         return err;
  60 }
  61 
  62 static int mmc_io_rw_direct_host(struct mmc_host *host, int write, unsigned fn,
  63         unsigned addr, u8 in, u8 *out)
  64 {
  65         struct mmc_command cmd = {};
  66         int err;
  67 
  68         if (fn > 7)
  69                 return -EINVAL;
  70 
  71         /* sanity check */
  72         if (addr & ~0x1FFFF)
  73                 return -EINVAL;
  74 
  75         cmd.opcode = SD_IO_RW_DIRECT;
  76         cmd.arg = write ? 0x80000000 : 0x00000000;
  77         cmd.arg |= fn << 28;
  78         cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
  79         cmd.arg |= addr << 9;
  80         cmd.arg |= in;
  81         cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
  82 
  83         err = mmc_wait_for_cmd(host, &cmd, 0);
  84         if (err)
  85                 return err;
  86 
  87         if (mmc_host_is_spi(host)) {
  88                 /* host driver already reported errors */
  89         } else {
  90                 if (cmd.resp[0] & R5_ERROR)
  91                         return -EIO;
  92                 if (cmd.resp[0] & R5_FUNCTION_NUMBER)
  93                         return -EINVAL;
  94                 if (cmd.resp[0] & R5_OUT_OF_RANGE)
  95                         return -ERANGE;
  96         }
  97 
  98         if (out) {
  99                 if (mmc_host_is_spi(host))
 100                         *out = (cmd.resp[0] >> 8) & 0xFF;
 101                 else
 102                         *out = cmd.resp[0] & 0xFF;
 103         }
 104 
 105         return 0;
 106 }
 107 
 108 int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
 109         unsigned addr, u8 in, u8 *out)
 110 {
 111         return mmc_io_rw_direct_host(card->host, write, fn, addr, in, out);
 112 }
 113 
 114 int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
 115         unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz)
 116 {
 117         struct mmc_request mrq = {};
 118         struct mmc_command cmd = {};
 119         struct mmc_data data = {};
 120         struct scatterlist sg, *sg_ptr;
 121         struct sg_table sgtable;
 122         unsigned int nents, left_size, i;
 123         unsigned int seg_size = card->host->max_seg_size;
 124 
 125         WARN_ON(blksz == 0);
 126 
 127         /* sanity check */
 128         if (addr & ~0x1FFFF)
 129                 return -EINVAL;
 130 
 131         mrq.cmd = &cmd;
 132         mrq.data = &data;
 133 
 134         cmd.opcode = SD_IO_RW_EXTENDED;
 135         cmd.arg = write ? 0x80000000 : 0x00000000;
 136         cmd.arg |= fn << 28;
 137         cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
 138         cmd.arg |= addr << 9;
 139         if (blocks == 0)
 140                 cmd.arg |= (blksz == 512) ? 0 : blksz;  /* byte mode */
 141         else
 142                 cmd.arg |= 0x08000000 | blocks;         /* block mode */
 143         cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
 144 
 145         data.blksz = blksz;
 146         /* Code in host drivers/fwk assumes that "blocks" always is >=1 */
 147         data.blocks = blocks ? blocks : 1;
 148         data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
 149 
 150         left_size = data.blksz * data.blocks;
 151         nents = DIV_ROUND_UP(left_size, seg_size);
 152         if (nents > 1) {
 153                 if (sg_alloc_table(&sgtable, nents, GFP_KERNEL))
 154                         return -ENOMEM;
 155 
 156                 data.sg = sgtable.sgl;
 157                 data.sg_len = nents;
 158 
 159                 for_each_sg(data.sg, sg_ptr, data.sg_len, i) {
 160                         sg_set_buf(sg_ptr, buf + i * seg_size,
 161                                    min(seg_size, left_size));
 162                         left_size -= seg_size;
 163                 }
 164         } else {
 165                 data.sg = &sg;
 166                 data.sg_len = 1;
 167 
 168                 sg_init_one(&sg, buf, left_size);
 169         }
 170 
 171         mmc_set_data_timeout(&data, card);
 172 
 173         mmc_wait_for_req(card->host, &mrq);
 174 
 175         if (nents > 1)
 176                 sg_free_table(&sgtable);
 177 
 178         if (cmd.error)
 179                 return cmd.error;
 180         if (data.error)
 181                 return data.error;
 182 
 183         if (mmc_host_is_spi(card->host)) {
 184                 /* host driver already reported errors */
 185         } else {
 186                 if (cmd.resp[0] & R5_ERROR)
 187                         return -EIO;
 188                 if (cmd.resp[0] & R5_FUNCTION_NUMBER)
 189                         return -EINVAL;
 190                 if (cmd.resp[0] & R5_OUT_OF_RANGE)
 191                         return -ERANGE;
 192         }
 193 
 194         return 0;
 195 }
 196 
 197 int sdio_reset(struct mmc_host *host)
 198 {
 199         int ret;
 200         u8 abort;
 201 
 202         /* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */
 203 
 204         ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort);
 205         if (ret)
 206                 abort = 0x08;
 207         else
 208                 abort |= 0x08;
 209 
 210         return mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL);
 211 }
 212
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/mmc/core/sdio_ops.c

DEFINITIONS
