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 #include "sdio_cis.h"
  26
  27 static int sdio_read_fbr(struct sdio_func *func)
  28 {
  29         int ret;
  30         unsigned char data;
  31
  32         ret = mmc_io_rw_direct(func->card, 0, 0,
  33                 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
  34         if (ret)
  35                 goto out;
  36
  37         data &= 0x0f;
  38
  39         if (data == 0x0f) {
  40                 ret = mmc_io_rw_direct(func->card, 0, 0,
  41                         SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
  42                 if (ret)
  43                         goto out;
  44         }
  45
  46         func->class = data;
  47
  48 out:
  49         return ret;
  50 }
  51
  52 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
  53 {
  54         int ret;
  55         struct sdio_func *func;
  56
  57         BUG_ON(fn > SDIO_MAX_FUNCS);
  58
  59         func = sdio_alloc_func(card);
  60         if (IS_ERR(func))
  61                 return PTR_ERR(func);
  62
  63         func->num = fn;
  64
  65         ret = sdio_read_fbr(func);
  66         if (ret)
  67                 goto fail;
  68
  69         ret = sdio_read_func_cis(func);
  70         if (ret)
  71                 goto fail;
  72
  73         card->sdio_func[fn - 1] = func;
  74
  75         return 0;
  76
  77 fail:
  78         /*
  79          * It is okay to remove the function here even though we hold
  80          * the host lock as we haven't registered the device yet.
  81          */
  82         sdio_remove_func(func);
  83         return ret;
  84 }
  85
  86 static int sdio_read_cccr(struct mmc_card *card)
  87 {
  88         int ret;
  89         int cccr_vsn;
  90         unsigned char data;
  91
  92         memset(&card->cccr, 0, sizeof(struct sdio_cccr));
  93
  94         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
  95         if (ret)
  96                 goto out;
  97
  98         cccr_vsn = data & 0x0f;
  99
 100         if (cccr_vsn > SDIO_CCCR_REV_1_20) {
 101                 printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
 102                         mmc_hostname(card->host), cccr_vsn);
 103                 return -EINVAL;
 104         }
 105
 106         card->cccr.sdio_vsn = (data & 0xf0) >> 4;
 107
 108         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
 109         if (ret)
 110                 goto out;
 111
 112         if (data & SDIO_CCCR_CAP_SMB)
 113                 card->cccr.multi_block = 1;
 114         if (data & SDIO_CCCR_CAP_LSC)
 115                 card->cccr.low_speed = 1;
 116         if (data & SDIO_CCCR_CAP_4BLS)
 117                 card->cccr.wide_bus = 1;
 118
 119         if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
 120                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
 121                 if (ret)
 122                         goto out;
 123
 124                 if (data & SDIO_POWER_SMPC)
 125                         card->cccr.high_power = 1;
 126         }
 127
 128         if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
 129                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
 130                 if (ret)
 131                         goto out;
 132
 133                 if (data & SDIO_SPEED_SHS)
 134                         card->cccr.high_speed = 1;
 135         }
 136
 137 out:
 138         return ret;
 139 }
 140
 141 static int sdio_enable_wide(struct mmc_card *card)
 142 {
 143         int ret;
 144         u8 ctrl;
 145
 146         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
 147                 return 0;
 148
 149         if (card->cccr.low_speed && !card->cccr.wide_bus)
 150                 return 0;
 151
 152         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
 153         if (ret)
 154                 return ret;
 155
 156         ctrl |= SDIO_BUS_WIDTH_4BIT;
 157
 158         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
 159         if (ret)
 160                 return ret;
 161
 162         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 163
 164         return 0;
 165 }
 166
 167 /*
 168  * Host is being removed. Free up the current card.
 169  */
 170 static void mmc_sdio_remove(struct mmc_host *host)
 171 {
 172         int i;
 173
 174         BUG_ON(!host);
 175         BUG_ON(!host->card);
 176
 177         for (i = 0;i < host->card->sdio_funcs;i++) {
 178                 if (host->card->sdio_func[i]) {
 179                         sdio_remove_func(host->card->sdio_func[i]);
 180                         host->card->sdio_func[i] = NULL;
 181                 }
 182         }
 183
 184         mmc_remove_card(host->card);
 185         host->card = NULL;
 186 }
 187
 188 /*
 189  * Card detection callback from host.
 190  */
 191 static void mmc_sdio_detect(struct mmc_host *host)
 192 {
 193         int err;
 194
 195         BUG_ON(!host);
 196         BUG_ON(!host->card);
 197
 198         mmc_claim_host(host);
 199
 200         /*
 201          * Just check if our card has been removed.
 202          */
 203         err = mmc_select_card(host->card);
 204
 205         mmc_release_host(host);
 206
 207         if (err) {
 208                 mmc_sdio_remove(host);
 209
 210                 mmc_claim_host(host);
 211                 mmc_detach_bus(host);
 212                 mmc_release_host(host);
 213         }
 214 }
 215
 216
 217 static const struct mmc_bus_ops mmc_sdio_ops = {
 218         .remove = mmc_sdio_remove,
 219         .detect = mmc_sdio_detect,
 220 };
 221
 222
 223 /*
 224  * Starting point for SDIO card init.
 225  */
 226 int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
 227 {
 228         int err;
 229         int i, funcs;
 230         struct mmc_card *card;
 231
 232         BUG_ON(!host);
 233         WARN_ON(!host->claimed);
 234
 235         mmc_attach_bus(host, &mmc_sdio_ops);
 236
 237         /*
 238          * Sanity check the voltages that the card claims to
 239          * support.
 240          */
 241         if (ocr & 0x7F) {
 242                 printk(KERN_WARNING "%s: card claims to support voltages "
 243                        "below the defined range. These will be ignored.\n",
 244                        mmc_hostname(host));
 245                 ocr &= ~0x7F;
 246         }
 247
 248         if (ocr & MMC_VDD_165_195) {
 249                 printk(KERN_WARNING "%s: SDIO card claims to support the "
 250                        "incompletely defined 'low voltage range'. This "
 251                        "will be ignored.\n", mmc_hostname(host));
 252                 ocr &= ~MMC_VDD_165_195;
 253         }
 254
 255         host->ocr = mmc_select_voltage(host, ocr);
 256
 257         /*
 258          * Can we support the voltage(s) of the card(s)?
 259          */
 260         if (!host->ocr) {
 261                 err = -EINVAL;
 262                 goto err;
 263         }
 264
 265         /*
 266          * Inform the card of the voltage
 267          */
 268         err = mmc_send_io_op_cond(host, host->ocr, &ocr);
 269         if (err)
 270                 goto err;
 271
 272         /*
 273          * For SPI, enable CRC as appropriate.
 274          */
 275         if (mmc_host_is_spi(host)) {
 276                 err = mmc_spi_set_crc(host, use_spi_crc);
 277                 if (err)
 278                         goto err;
 279         }
 280
 281         /*
 282          * The number of functions on the card is encoded inside
 283          * the ocr.
 284          */
 285         funcs = (ocr & 0x70000000) >> 28;
 286
 287         /*
 288          * Allocate card structure.
 289          */
 290         card = mmc_alloc_card(host, NULL);
 291         if (IS_ERR(card)) {
 292                 err = PTR_ERR(card);
 293                 goto err;
 294         }
 295
 296         card->type = MMC_TYPE_SDIO;
 297         card->sdio_funcs = funcs;
 298
 299         host->card = card;
 300
 301         /*
 302          * For native busses:  set card RCA and quit open drain mode.
 303          */
 304         if (!mmc_host_is_spi(host)) {
 305                 err = mmc_send_relative_addr(host, &card->rca);
 306                 if (err)
 307                         goto remove;
 308
 309                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 310         }
 311
 312         /*
 313          * Select card, as all following commands rely on that.
 314          */
 315         if (!mmc_host_is_spi(host)) {
 316                 err = mmc_select_card(card);
 317                 if (err)
 318                         goto remove;
 319         }
 320
 321         /*
 322          * Read the common registers.
 323          */
 324         err = sdio_read_cccr(card);
 325         if (err)
 326                 goto remove;
 327
 328         /*
 329          * Read the common CIS tuples.
 330          */
 331         err = sdio_read_common_cis(card);
 332         if (err)
 333                 goto remove;
 334
 335         /*
 336          * No support for high-speed yet, so just set
 337          * the card's maximum speed.
 338          */
 339         mmc_set_clock(host, card->cis.max_dtr);
 340
 341         /*
 342          * Switch to wider bus (if supported).
 343          */
 344         err = sdio_enable_wide(card);
 345         if (err)
 346                 goto remove;
 347
 348         /*
 349          * Initialize (but don't add) all present functions.
 350          */
 351         for (i = 0;i < funcs;i++) {
 352                 err = sdio_init_func(host->card, i + 1);
 353                 if (err)
 354                         goto remove;
 355         }
 356
 357         mmc_release_host(host);
 358
 359         /*
 360          * First add the card to the driver model...
 361          */
 362         err = mmc_add_card(host->card);
 363         if (err)
 364                 goto remove_added;
 365
 366         /*
 367          * ...then the SDIO functions.
 368          */
 369         for (i = 0;i < funcs;i++) {
 370                 err = sdio_add_func(host->card->sdio_func[i]);
 371                 if (err)
 372                         goto remove_added;
 373         }
 374
 375         return 0;
 376
 377
 378 remove_added:
 379         /* Remove without lock if the device has been added. */
 380         mmc_sdio_remove(host);
 381         mmc_claim_host(host);
 382 remove:
 383         /* And with lock if it hasn't been added. */
 384         if (host->card)
 385                 mmc_sdio_remove(host);
 386 err:
 387         mmc_detach_bus(host);
 388         mmc_release_host(host);
 389
 390         printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
 391                 mmc_hostname(host), err);
 392
 393         return err;
 394 }
 395