drivers/mmc/core/sdio.c

   1 /*
   2  *  linux/drivers/mmc/sdio.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/err.h>
  13
  14 #include <linux/mmc/host.h>
  15 #include <linux/mmc/card.h>
  16 #include <linux/mmc/sdio.h>
  17 #include <linux/mmc/sdio_func.h>
  18
  19 #include "core.h"
  20 #include "bus.h"
  21 #include "sdio_bus.h"
  22 #include "mmc_ops.h"
  23 #include "sd_ops.h"
  24 #include "sdio_ops.h"
  25
  26 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
  27 {
  28         struct sdio_func *func;
  29
  30         BUG_ON(fn > SDIO_MAX_FUNCS);
  31
  32         func = sdio_alloc_func(card);
  33         if (IS_ERR(func))
  34                 return PTR_ERR(func);
  35
  36         func->num = fn;
  37
  38         card->sdio_func[fn - 1] = func;
  39
  40         return 0;
  41 }
  42
  43 static int sdio_read_cccr(struct mmc_card *card)
  44 {
  45         int ret;
  46         int cccr_vsn;
  47         unsigned char data;
  48
  49         memset(&card->cccr, 0, sizeof(struct sdio_cccr));
  50
  51         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
  52         if (ret)
  53                 goto out;
  54
  55         cccr_vsn = data & 0x0f;
  56
  57         if (cccr_vsn > SDIO_CCCR_REV_1_20) {
  58                 printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
  59                         mmc_hostname(card->host), cccr_vsn);
  60                 return -EINVAL;
  61         }
  62
  63         card->cccr.sdio_vsn = (data & 0xf0) >> 4;
  64
  65         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
  66         if (ret)
  67                 goto out;
  68
  69         if (data & SDIO_CCCR_CAP_SMB)
  70                 card->cccr.multi_block = 1;
  71         if (data & SDIO_CCCR_CAP_LSC)
  72                 card->cccr.low_speed = 1;
  73         if (data & SDIO_CCCR_CAP_4BLS)
  74                 card->cccr.wide_bus = 1;
  75
  76         if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
  77                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
  78                 if (ret)
  79                         goto out;
  80
  81                 if (data & SDIO_POWER_SMPC)
  82                         card->cccr.high_power = 1;
  83         }
  84
  85         if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
  86                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
  87                 if (ret)
  88                         goto out;
  89
  90                 if (data & SDIO_SPEED_SHS)
  91                         card->cccr.high_speed = 1;
  92         }
  93
  94 out:
  95         return ret;
  96 }
  97
  98 /*
  99  * Host is being removed. Free up the current card.
 100  */
 101 static void mmc_sdio_remove(struct mmc_host *host)
 102 {
 103         int i;
 104
 105         BUG_ON(!host);
 106         BUG_ON(!host->card);
 107
 108         for (i = 0;i < host->card->sdio_funcs;i++) {
 109                 if (host->card->sdio_func[i]) {
 110                         sdio_remove_func(host->card->sdio_func[i]);
 111                         host->card->sdio_func[i] = NULL;
 112                 }
 113         }
 114
 115         mmc_remove_card(host->card);
 116         host->card = NULL;
 117 }
 118
 119 /*
 120  * Card detection callback from host.
 121  */
 122 static void mmc_sdio_detect(struct mmc_host *host)
 123 {
 124         int err;
 125
 126         BUG_ON(!host);
 127         BUG_ON(!host->card);
 128
 129         mmc_claim_host(host);
 130
 131         /*
 132          * Just check if our card has been removed.
 133          */
 134         err = mmc_select_card(host->card);
 135
 136         mmc_release_host(host);
 137
 138         if (err) {
 139                 mmc_sdio_remove(host);
 140
 141                 mmc_claim_host(host);
 142                 mmc_detach_bus(host);
 143                 mmc_release_host(host);
 144         }
 145 }
 146
 147
 148 static const struct mmc_bus_ops mmc_sdio_ops = {
 149         .remove = mmc_sdio_remove,
 150         .detect = mmc_sdio_detect,
 151 };
 152
 153
 154 /*
 155  * Starting point for SDIO card init.
 156  */
 157 int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
 158 {
 159         int err;
 160         int i, funcs;
 161         struct mmc_card *card;
 162
 163         BUG_ON(!host);
 164         BUG_ON(!host->claimed);
 165
 166         mmc_attach_bus(host, &mmc_sdio_ops);
 167
 168         /*
 169          * Sanity check the voltages that the card claims to
 170          * support.
 171          */
 172         if (ocr & 0x7F) {
 173                 printk(KERN_WARNING "%s: card claims to support voltages "
 174                        "below the defined range. These will be ignored.\n",
 175                        mmc_hostname(host));
 176                 ocr &= ~0x7F;
 177         }
 178
 179         if (ocr & MMC_VDD_165_195) {
 180                 printk(KERN_WARNING "%s: SDIO card claims to support the "
 181                        "incompletely defined 'low voltage range'. This "
 182                        "will be ignored.\n", mmc_hostname(host));
 183                 ocr &= ~MMC_VDD_165_195;
 184         }
 185
 186         host->ocr = mmc_select_voltage(host, ocr);
 187
 188         /*
 189          * Can we support the voltage(s) of the card(s)?
 190          */
 191         if (!host->ocr) {
 192                 err = -EINVAL;
 193                 goto err;
 194         }
 195
 196         /*
 197          * Inform the card of the voltage
 198          */
 199         err = mmc_send_io_op_cond(host, host->ocr, &ocr);
 200         if (err)
 201                 goto err;
 202
 203         /*
 204          * The number of functions on the card is encoded inside
 205          * the ocr.
 206          */
 207         funcs = (ocr & 0x70000000) >> 28;
 208
 209         /*
 210          * Allocate card structure.
 211          */
 212         card = mmc_alloc_card(host);
 213         if (IS_ERR(card)) {
 214                 err = PTR_ERR(card);
 215                 goto err;
 216         }
 217
 218         card->type = MMC_TYPE_SDIO;
 219         card->sdio_funcs = funcs;
 220
 221         host->card = card;
 222
 223         /*
 224          * Set card RCA.
 225          */
 226         err = mmc_send_relative_addr(host, &card->rca);
 227         if (err)
 228                 goto remove;
 229
 230         mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 231
 232         /*
 233          * Select card, as all following commands rely on that.
 234          */
 235         err = mmc_select_card(card);
 236         if (err)
 237                 goto remove;
 238
 239         /*
 240          * Read the common registers.
 241          */
 242         err = sdio_read_cccr(card);
 243         if (err)
 244                 goto remove;
 245
 246         /*
 247          * Initialize (but don't add) all present functions.
 248          */
 249         for (i = 0;i < funcs;i++) {
 250                 err = sdio_init_func(host->card, i + 1);
 251                 if (err)
 252                         goto remove;
 253         }
 254
 255         mmc_release_host(host);
 256
 257         /*
 258          * First add the card to the driver model...
 259          */
 260         err = mmc_add_card(host->card);
 261         if (err)
 262                 goto remove_added;
 263
 264         /*
 265          * ...then the SDIO functions.
 266          */
 267         for (i = 0;i < funcs;i++) {
 268                 err = sdio_add_func(host->card->sdio_func[i]);
 269                 if (err)
 270                         goto remove_added;
 271         }
 272
 273         return 0;
 274
 275
 276 remove_added:
 277         /* Remove without lock if the device has been added. */
 278         mmc_sdio_remove(host);
 279         mmc_claim_host(host);
 280 remove:
 281         /* And with lock if it hasn't been added. */
 282         if (host->card)
 283                 mmc_sdio_remove(host);
 284 err:
 285         mmc_detach_bus(host);
 286         mmc_release_host(host);
 287
 288         printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
 289                 mmc_hostname(host), err);
 290
 291         return err;
 292 }
 293