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 } 395 396