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 * Test if the card supports high-speed mode and, if so, switch to it. 169 */ 170 static int sdio_enable_hs(struct mmc_card *card) 171 { 172 int ret; 173 u8 speed; 174 175 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 176 return 0; 177 178 if (!card->cccr.high_speed) 179 return 0; 180 181 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); 182 if (ret) 183 return ret; 184 185 speed |= SDIO_SPEED_EHS; 186 187 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); 188 if (ret) 189 return ret; 190 191 mmc_card_set_highspeed(card); 192 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 193 194 return 0; 195 } 196 197 /* 198 * Host is being removed. Free up the current card. 199 */ 200 static void mmc_sdio_remove(struct mmc_host *host) 201 { 202 int i; 203 204 BUG_ON(!host); 205 BUG_ON(!host->card); 206 207 for (i = 0;i < host->card->sdio_funcs;i++) { 208 if (host->card->sdio_func[i]) { 209 sdio_remove_func(host->card->sdio_func[i]); 210 host->card->sdio_func[i] = NULL; 211 } 212 } 213 214 mmc_remove_card(host->card); 215 host->card = NULL; 216 } 217 218 /* 219 * Card detection callback from host. 220 */ 221 static void mmc_sdio_detect(struct mmc_host *host) 222 { 223 int err; 224 225 BUG_ON(!host); 226 BUG_ON(!host->card); 227 228 mmc_claim_host(host); 229 230 /* 231 * Just check if our card has been removed. 232 */ 233 err = mmc_select_card(host->card); 234 235 mmc_release_host(host); 236 237 if (err) { 238 mmc_sdio_remove(host); 239 240 mmc_claim_host(host); 241 mmc_detach_bus(host); 242 mmc_release_host(host); 243 } 244 } 245 246 247 static const struct mmc_bus_ops mmc_sdio_ops = { 248 .remove = mmc_sdio_remove, 249 .detect = mmc_sdio_detect, 250 }; 251 252 253 /* 254 * Starting point for SDIO card init. 255 */ 256 int mmc_attach_sdio(struct mmc_host *host, u32 ocr) 257 { 258 int err; 259 int i, funcs; 260 struct mmc_card *card; 261 262 BUG_ON(!host); 263 WARN_ON(!host->claimed); 264 265 mmc_attach_bus(host, &mmc_sdio_ops); 266 267 /* 268 * Sanity check the voltages that the card claims to 269 * support. 270 */ 271 if (ocr & 0x7F) { 272 printk(KERN_WARNING "%s: card claims to support voltages " 273 "below the defined range. These will be ignored.\n", 274 mmc_hostname(host)); 275 ocr &= ~0x7F; 276 } 277 278 if (ocr & MMC_VDD_165_195) { 279 printk(KERN_WARNING "%s: SDIO card claims to support the " 280 "incompletely defined 'low voltage range'. This " 281 "will be ignored.\n", mmc_hostname(host)); 282 ocr &= ~MMC_VDD_165_195; 283 } 284 285 host->ocr = mmc_select_voltage(host, ocr); 286 287 /* 288 * Can we support the voltage(s) of the card(s)? 289 */ 290 if (!host->ocr) { 291 err = -EINVAL; 292 goto err; 293 } 294 295 /* 296 * Inform the card of the voltage 297 */ 298 err = mmc_send_io_op_cond(host, host->ocr, &ocr); 299 if (err) 300 goto err; 301 302 /* 303 * For SPI, enable CRC as appropriate. 304 */ 305 if (mmc_host_is_spi(host)) { 306 err = mmc_spi_set_crc(host, use_spi_crc); 307 if (err) 308 goto err; 309 } 310 311 /* 312 * The number of functions on the card is encoded inside 313 * the ocr. 314 */ 315 funcs = (ocr & 0x70000000) >> 28; 316 317 /* 318 * Allocate card structure. 319 */ 320 card = mmc_alloc_card(host, NULL); 321 if (IS_ERR(card)) { 322 err = PTR_ERR(card); 323 goto err; 324 } 325 326 card->type = MMC_TYPE_SDIO; 327 card->sdio_funcs = funcs; 328 329 host->card = card; 330 331 /* 332 * For native busses: set card RCA and quit open drain mode. 333 */ 334 if (!mmc_host_is_spi(host)) { 335 err = mmc_send_relative_addr(host, &card->rca); 336 if (err) 337 goto remove; 338 339 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); 340 } 341 342 /* 343 * Select card, as all following commands rely on that. 344 */ 345 if (!mmc_host_is_spi(host)) { 346 err = mmc_select_card(card); 347 if (err) 348 goto remove; 349 } 350 351 /* 352 * Read the common registers. 353 */ 354 err = sdio_read_cccr(card); 355 if (err) 356 goto remove; 357 358 /* 359 * Read the common CIS tuples. 360 */ 361 err = sdio_read_common_cis(card); 362 if (err) 363 goto remove; 364 365 /* 366 * Switch to high-speed (if supported). 367 */ 368 err = sdio_enable_hs(card); 369 if (err) 370 goto remove; 371 372 /* 373 * Change to the card's maximum speed. 374 */ 375 if (mmc_card_highspeed(card)) { 376 /* 377 * The SDIO specification doesn't mention how 378 * the CIS transfer speed register relates to 379 * high-speed, but it seems that 50 MHz is 380 * mandatory. 381 */ 382 mmc_set_clock(host, 50000000); 383 } else { 384 mmc_set_clock(host, card->cis.max_dtr); 385 } 386 387 /* 388 * Switch to wider bus (if supported). 389 */ 390 err = sdio_enable_wide(card); 391 if (err) 392 goto remove; 393 394 /* 395 * Initialize (but don't add) all present functions. 396 */ 397 for (i = 0;i < funcs;i++) { 398 err = sdio_init_func(host->card, i + 1); 399 if (err) 400 goto remove; 401 } 402 403 mmc_release_host(host); 404 405 /* 406 * First add the card to the driver model... 407 */ 408 err = mmc_add_card(host->card); 409 if (err) 410 goto remove_added; 411 412 /* 413 * ...then the SDIO functions. 414 */ 415 for (i = 0;i < funcs;i++) { 416 err = sdio_add_func(host->card->sdio_func[i]); 417 if (err) 418 goto remove_added; 419 } 420 421 return 0; 422 423 424 remove_added: 425 /* Remove without lock if the device has been added. */ 426 mmc_sdio_remove(host); 427 mmc_claim_host(host); 428 remove: 429 /* And with lock if it hasn't been added. */ 430 if (host->card) 431 mmc_sdio_remove(host); 432 err: 433 mmc_detach_bus(host); 434 mmc_release_host(host); 435 436 printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n", 437 mmc_hostname(host), err); 438 439 return err; 440 } 441 442