1 /* 2 * linux/drivers/mmc/core/sd.c 3 * 4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved. 5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. 6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/err.h> 14 #include <linux/slab.h> 15 16 #include <linux/mmc/host.h> 17 #include <linux/mmc/card.h> 18 #include <linux/mmc/mmc.h> 19 #include <linux/mmc/sd.h> 20 21 #include "core.h" 22 #include "bus.h" 23 #include "mmc_ops.h" 24 #include "sd.h" 25 #include "sd_ops.h" 26 27 static const unsigned int tran_exp[] = { 28 10000, 100000, 1000000, 10000000, 29 0, 0, 0, 0 30 }; 31 32 static const unsigned char tran_mant[] = { 33 0, 10, 12, 13, 15, 20, 25, 30, 34 35, 40, 45, 50, 55, 60, 70, 80, 35 }; 36 37 static const unsigned int tacc_exp[] = { 38 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 39 }; 40 41 static const unsigned int tacc_mant[] = { 42 0, 10, 12, 13, 15, 20, 25, 30, 43 35, 40, 45, 50, 55, 60, 70, 80, 44 }; 45 46 #define UNSTUFF_BITS(resp,start,size) \ 47 ({ \ 48 const int __size = size; \ 49 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 50 const int __off = 3 - ((start) / 32); \ 51 const int __shft = (start) & 31; \ 52 u32 __res; \ 53 \ 54 __res = resp[__off] >> __shft; \ 55 if (__size + __shft > 32) \ 56 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 57 __res & __mask; \ 58 }) 59 60 /* 61 * Given the decoded CSD structure, decode the raw CID to our CID structure. 62 */ 63 void mmc_decode_cid(struct mmc_card *card) 64 { 65 u32 *resp = card->raw_cid; 66 67 memset(&card->cid, 0, sizeof(struct mmc_cid)); 68 69 /* 70 * SD doesn't currently have a version field so we will 71 * have to assume we can parse this. 72 */ 73 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 74 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 75 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 76 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 77 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 78 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 79 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 80 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); 81 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); 82 card->cid.serial = UNSTUFF_BITS(resp, 24, 32); 83 card->cid.year = UNSTUFF_BITS(resp, 12, 8); 84 card->cid.month = UNSTUFF_BITS(resp, 8, 4); 85 86 card->cid.year += 2000; /* SD cards year offset */ 87 } 88 89 /* 90 * Given a 128-bit response, decode to our card CSD structure. 91 */ 92 static int mmc_decode_csd(struct mmc_card *card) 93 { 94 struct mmc_csd *csd = &card->csd; 95 unsigned int e, m, csd_struct; 96 u32 *resp = card->raw_csd; 97 98 csd_struct = UNSTUFF_BITS(resp, 126, 2); 99 100 switch (csd_struct) { 101 case 0: 102 m = UNSTUFF_BITS(resp, 115, 4); 103 e = UNSTUFF_BITS(resp, 112, 3); 104 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 105 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 106 107 m = UNSTUFF_BITS(resp, 99, 4); 108 e = UNSTUFF_BITS(resp, 96, 3); 109 csd->max_dtr = tran_exp[e] * tran_mant[m]; 110 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 111 112 e = UNSTUFF_BITS(resp, 47, 3); 113 m = UNSTUFF_BITS(resp, 62, 12); 114 csd->capacity = (1 + m) << (e + 2); 115 116 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 117 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 118 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 119 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 120 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 121 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 122 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 123 124 if (UNSTUFF_BITS(resp, 46, 1)) { 125 csd->erase_size = 1; 126 } else if (csd->write_blkbits >= 9) { 127 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; 128 csd->erase_size <<= csd->write_blkbits - 9; 129 } 130 break; 131 case 1: 132 /* 133 * This is a block-addressed SDHC or SDXC card. Most 134 * interesting fields are unused and have fixed 135 * values. To avoid getting tripped by buggy cards, 136 * we assume those fixed values ourselves. 137 */ 138 mmc_card_set_blockaddr(card); 139 140 csd->tacc_ns = 0; /* Unused */ 141 csd->tacc_clks = 0; /* Unused */ 142 143 m = UNSTUFF_BITS(resp, 99, 4); 144 e = UNSTUFF_BITS(resp, 96, 3); 145 csd->max_dtr = tran_exp[e] * tran_mant[m]; 146 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 147 csd->c_size = UNSTUFF_BITS(resp, 48, 22); 148 149 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */ 150 if (csd->c_size >= 0xFFFF) 151 mmc_card_set_ext_capacity(card); 152 153 m = UNSTUFF_BITS(resp, 48, 22); 154 csd->capacity = (1 + m) << 10; 155 156 csd->read_blkbits = 9; 157 csd->read_partial = 0; 158 csd->write_misalign = 0; 159 csd->read_misalign = 0; 160 csd->r2w_factor = 4; /* Unused */ 161 csd->write_blkbits = 9; 162 csd->write_partial = 0; 163 csd->erase_size = 1; 164 break; 165 default: 166 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n", 167 mmc_hostname(card->host), csd_struct); 168 return -EINVAL; 169 } 170 171 card->erase_size = csd->erase_size; 172 173 return 0; 174 } 175 176 /* 177 * Given a 64-bit response, decode to our card SCR structure. 178 */ 179 static int mmc_decode_scr(struct mmc_card *card) 180 { 181 struct sd_scr *scr = &card->scr; 182 unsigned int scr_struct; 183 u32 resp[4]; 184 185 resp[3] = card->raw_scr[1]; 186 resp[2] = card->raw_scr[0]; 187 188 scr_struct = UNSTUFF_BITS(resp, 60, 4); 189 if (scr_struct != 0) { 190 printk(KERN_ERR "%s: unrecognised SCR structure version %d\n", 191 mmc_hostname(card->host), scr_struct); 192 return -EINVAL; 193 } 194 195 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 196 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 197 if (scr->sda_vsn == SCR_SPEC_VER_2) 198 /* Check if Physical Layer Spec v3.0 is supported */ 199 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); 200 201 if (UNSTUFF_BITS(resp, 55, 1)) 202 card->erased_byte = 0xFF; 203 else 204 card->erased_byte = 0x0; 205 206 if (scr->sda_spec3) 207 scr->cmds = UNSTUFF_BITS(resp, 32, 2); 208 return 0; 209 } 210 211 /* 212 * Fetch and process SD Status register. 213 */ 214 static int mmc_read_ssr(struct mmc_card *card) 215 { 216 unsigned int au, es, et, eo; 217 int err, i; 218 u32 *ssr; 219 220 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 221 printk(KERN_WARNING "%s: card lacks mandatory SD Status " 222 "function.\n", mmc_hostname(card->host)); 223 return 0; 224 } 225 226 ssr = kmalloc(64, GFP_KERNEL); 227 if (!ssr) 228 return -ENOMEM; 229 230 err = mmc_app_sd_status(card, ssr); 231 if (err) { 232 printk(KERN_WARNING "%s: problem reading SD Status " 233 "register.\n", mmc_hostname(card->host)); 234 err = 0; 235 goto out; 236 } 237 238 for (i = 0; i < 16; i++) 239 ssr[i] = be32_to_cpu(ssr[i]); 240 241 /* 242 * UNSTUFF_BITS only works with four u32s so we have to offset the 243 * bitfield positions accordingly. 244 */ 245 au = UNSTUFF_BITS(ssr, 428 - 384, 4); 246 if (au > 0 || au <= 9) { 247 card->ssr.au = 1 << (au + 4); 248 es = UNSTUFF_BITS(ssr, 408 - 384, 16); 249 et = UNSTUFF_BITS(ssr, 402 - 384, 6); 250 eo = UNSTUFF_BITS(ssr, 400 - 384, 2); 251 if (es && et) { 252 card->ssr.erase_timeout = (et * 1000) / es; 253 card->ssr.erase_offset = eo * 1000; 254 } 255 } else { 256 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit " 257 "size.\n", mmc_hostname(card->host)); 258 } 259 out: 260 kfree(ssr); 261 return err; 262 } 263 264 /* 265 * Fetches and decodes switch information 266 */ 267 static int mmc_read_switch(struct mmc_card *card) 268 { 269 int err; 270 u8 *status; 271 272 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 273 return 0; 274 275 if (!(card->csd.cmdclass & CCC_SWITCH)) { 276 printk(KERN_WARNING "%s: card lacks mandatory switch " 277 "function, performance might suffer.\n", 278 mmc_hostname(card->host)); 279 return 0; 280 } 281 282 err = -EIO; 283 284 status = kmalloc(64, GFP_KERNEL); 285 if (!status) { 286 printk(KERN_ERR "%s: could not allocate a buffer for " 287 "switch capabilities.\n", 288 mmc_hostname(card->host)); 289 return -ENOMEM; 290 } 291 292 /* Find out the supported Bus Speed Modes. */ 293 err = mmc_sd_switch(card, 0, 0, 1, status); 294 if (err) { 295 /* 296 * If the host or the card can't do the switch, 297 * fail more gracefully. 298 */ 299 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 300 goto out; 301 302 printk(KERN_WARNING "%s: problem reading Bus Speed modes.\n", 303 mmc_hostname(card->host)); 304 err = 0; 305 306 goto out; 307 } 308 309 if (card->scr.sda_spec3) { 310 card->sw_caps.sd3_bus_mode = status[13]; 311 312 /* Find out Driver Strengths supported by the card */ 313 err = mmc_sd_switch(card, 0, 2, 1, status); 314 if (err) { 315 /* 316 * If the host or the card can't do the switch, 317 * fail more gracefully. 318 */ 319 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 320 goto out; 321 322 printk(KERN_WARNING "%s: problem reading " 323 "Driver Strength.\n", 324 mmc_hostname(card->host)); 325 err = 0; 326 327 goto out; 328 } 329 330 card->sw_caps.sd3_drv_type = status[9]; 331 332 /* Find out Current Limits supported by the card */ 333 err = mmc_sd_switch(card, 0, 3, 1, status); 334 if (err) { 335 /* 336 * If the host or the card can't do the switch, 337 * fail more gracefully. 338 */ 339 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 340 goto out; 341 342 printk(KERN_WARNING "%s: problem reading " 343 "Current Limit.\n", 344 mmc_hostname(card->host)); 345 err = 0; 346 347 goto out; 348 } 349 350 card->sw_caps.sd3_curr_limit = status[7]; 351 } else { 352 if (status[13] & 0x02) 353 card->sw_caps.hs_max_dtr = 50000000; 354 } 355 356 out: 357 kfree(status); 358 359 return err; 360 } 361 362 /* 363 * Test if the card supports high-speed mode and, if so, switch to it. 364 */ 365 int mmc_sd_switch_hs(struct mmc_card *card) 366 { 367 int err; 368 u8 *status; 369 370 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 371 return 0; 372 373 if (!(card->csd.cmdclass & CCC_SWITCH)) 374 return 0; 375 376 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 377 return 0; 378 379 if (card->sw_caps.hs_max_dtr == 0) 380 return 0; 381 382 err = -EIO; 383 384 status = kmalloc(64, GFP_KERNEL); 385 if (!status) { 386 printk(KERN_ERR "%s: could not allocate a buffer for " 387 "switch capabilities.\n", mmc_hostname(card->host)); 388 return -ENOMEM; 389 } 390 391 err = mmc_sd_switch(card, 1, 0, 1, status); 392 if (err) 393 goto out; 394 395 if ((status[16] & 0xF) != 1) { 396 printk(KERN_WARNING "%s: Problem switching card " 397 "into high-speed mode!\n", 398 mmc_hostname(card->host)); 399 err = 0; 400 } else { 401 err = 1; 402 } 403 404 out: 405 kfree(status); 406 407 return err; 408 } 409 410 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 411 { 412 int host_drv_type = 0, card_drv_type = 0; 413 int err; 414 415 /* 416 * If the host doesn't support any of the Driver Types A,C or D, 417 * default Driver Type B is used. 418 */ 419 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C 420 | MMC_CAP_DRIVER_TYPE_D))) 421 return 0; 422 423 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) { 424 host_drv_type = MMC_SET_DRIVER_TYPE_A; 425 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) 426 card_drv_type = MMC_SET_DRIVER_TYPE_A; 427 else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_B) 428 card_drv_type = MMC_SET_DRIVER_TYPE_B; 429 else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 430 card_drv_type = MMC_SET_DRIVER_TYPE_C; 431 } else if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) { 432 host_drv_type = MMC_SET_DRIVER_TYPE_C; 433 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 434 card_drv_type = MMC_SET_DRIVER_TYPE_C; 435 } else if (!(card->host->caps & MMC_CAP_DRIVER_TYPE_D)) { 436 /* 437 * If we are here, that means only the default driver type 438 * B is supported by the host. 439 */ 440 host_drv_type = MMC_SET_DRIVER_TYPE_B; 441 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_B) 442 card_drv_type = MMC_SET_DRIVER_TYPE_B; 443 else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 444 card_drv_type = MMC_SET_DRIVER_TYPE_C; 445 } 446 447 err = mmc_sd_switch(card, 1, 2, card_drv_type, status); 448 if (err) 449 return err; 450 451 if ((status[15] & 0xF) != card_drv_type) { 452 printk(KERN_WARNING "%s: Problem setting driver strength!\n", 453 mmc_hostname(card->host)); 454 return 0; 455 } 456 457 mmc_set_driver_type(card->host, host_drv_type); 458 459 return 0; 460 } 461 462 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 463 { 464 unsigned int bus_speed = 0, timing = 0; 465 int err; 466 467 /* 468 * If the host doesn't support any of the UHS-I modes, fallback on 469 * default speed. 470 */ 471 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 472 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) 473 return 0; 474 475 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 476 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 477 bus_speed = UHS_SDR104_BUS_SPEED; 478 timing = MMC_TIMING_UHS_SDR104; 479 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 480 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 481 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 482 bus_speed = UHS_DDR50_BUS_SPEED; 483 timing = MMC_TIMING_UHS_DDR50; 484 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 485 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 486 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 487 SD_MODE_UHS_SDR50)) { 488 bus_speed = UHS_SDR50_BUS_SPEED; 489 timing = MMC_TIMING_UHS_SDR50; 490 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 491 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 492 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 493 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 494 bus_speed = UHS_SDR25_BUS_SPEED; 495 timing = MMC_TIMING_UHS_SDR25; 496 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 497 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 498 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 499 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 500 SD_MODE_UHS_SDR12)) { 501 bus_speed = UHS_SDR12_BUS_SPEED; 502 timing = MMC_TIMING_UHS_SDR12; 503 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 504 } 505 506 card->sd_bus_speed = bus_speed; 507 err = mmc_sd_switch(card, 1, 0, bus_speed, status); 508 if (err) 509 return err; 510 511 if ((status[16] & 0xF) != bus_speed) 512 printk(KERN_WARNING "%s: Problem setting bus speed mode!\n", 513 mmc_hostname(card->host)); 514 else { 515 mmc_set_timing(card->host, timing); 516 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 517 } 518 519 return 0; 520 } 521 522 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 523 { 524 int current_limit = 0; 525 int err; 526 527 /* 528 * Current limit switch is only defined for SDR50, SDR104, and DDR50 529 * bus speed modes. For other bus speed modes, we set the default 530 * current limit of 200mA. 531 */ 532 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) || 533 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) || 534 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) { 535 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) { 536 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) 537 current_limit = SD_SET_CURRENT_LIMIT_800; 538 else if (card->sw_caps.sd3_curr_limit & 539 SD_MAX_CURRENT_600) 540 current_limit = SD_SET_CURRENT_LIMIT_600; 541 else if (card->sw_caps.sd3_curr_limit & 542 SD_MAX_CURRENT_400) 543 current_limit = SD_SET_CURRENT_LIMIT_400; 544 else if (card->sw_caps.sd3_curr_limit & 545 SD_MAX_CURRENT_200) 546 current_limit = SD_SET_CURRENT_LIMIT_200; 547 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) { 548 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) 549 current_limit = SD_SET_CURRENT_LIMIT_600; 550 else if (card->sw_caps.sd3_curr_limit & 551 SD_MAX_CURRENT_400) 552 current_limit = SD_SET_CURRENT_LIMIT_400; 553 else if (card->sw_caps.sd3_curr_limit & 554 SD_MAX_CURRENT_200) 555 current_limit = SD_SET_CURRENT_LIMIT_200; 556 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) { 557 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) 558 current_limit = SD_SET_CURRENT_LIMIT_400; 559 else if (card->sw_caps.sd3_curr_limit & 560 SD_MAX_CURRENT_200) 561 current_limit = SD_SET_CURRENT_LIMIT_200; 562 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) { 563 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) 564 current_limit = SD_SET_CURRENT_LIMIT_200; 565 } 566 } else 567 current_limit = SD_SET_CURRENT_LIMIT_200; 568 569 err = mmc_sd_switch(card, 1, 3, current_limit, status); 570 if (err) 571 return err; 572 573 if (((status[15] >> 4) & 0x0F) != current_limit) 574 printk(KERN_WARNING "%s: Problem setting current limit!\n", 575 mmc_hostname(card->host)); 576 577 return 0; 578 } 579 580 /* 581 * UHS-I specific initialization procedure 582 */ 583 static int mmc_sd_init_uhs_card(struct mmc_card *card) 584 { 585 int err; 586 u8 *status; 587 588 if (!card->scr.sda_spec3) 589 return 0; 590 591 if (!(card->csd.cmdclass & CCC_SWITCH)) 592 return 0; 593 594 status = kmalloc(64, GFP_KERNEL); 595 if (!status) { 596 printk(KERN_ERR "%s: could not allocate a buffer for " 597 "switch capabilities.\n", mmc_hostname(card->host)); 598 return -ENOMEM; 599 } 600 601 /* Set 4-bit bus width */ 602 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 603 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 604 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 605 if (err) 606 goto out; 607 608 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 609 } 610 611 /* Set the driver strength for the card */ 612 err = sd_select_driver_type(card, status); 613 if (err) 614 goto out; 615 616 /* Set bus speed mode of the card */ 617 err = sd_set_bus_speed_mode(card, status); 618 if (err) 619 goto out; 620 621 /* Set current limit for the card */ 622 err = sd_set_current_limit(card, status); 623 if (err) 624 goto out; 625 626 /* SPI mode doesn't define CMD19 */ 627 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) 628 err = card->host->ops->execute_tuning(card->host); 629 630 out: 631 kfree(status); 632 633 return err; 634 } 635 636 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 637 card->raw_cid[2], card->raw_cid[3]); 638 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 639 card->raw_csd[2], card->raw_csd[3]); 640 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 641 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 642 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 643 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 644 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 645 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 646 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 647 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 648 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 649 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 650 651 652 static struct attribute *sd_std_attrs[] = { 653 &dev_attr_cid.attr, 654 &dev_attr_csd.attr, 655 &dev_attr_scr.attr, 656 &dev_attr_date.attr, 657 &dev_attr_erase_size.attr, 658 &dev_attr_preferred_erase_size.attr, 659 &dev_attr_fwrev.attr, 660 &dev_attr_hwrev.attr, 661 &dev_attr_manfid.attr, 662 &dev_attr_name.attr, 663 &dev_attr_oemid.attr, 664 &dev_attr_serial.attr, 665 NULL, 666 }; 667 668 static struct attribute_group sd_std_attr_group = { 669 .attrs = sd_std_attrs, 670 }; 671 672 static const struct attribute_group *sd_attr_groups[] = { 673 &sd_std_attr_group, 674 NULL, 675 }; 676 677 struct device_type sd_type = { 678 .groups = sd_attr_groups, 679 }; 680 681 /* 682 * Fetch CID from card. 683 */ 684 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 685 { 686 int err; 687 688 /* 689 * Since we're changing the OCR value, we seem to 690 * need to tell some cards to go back to the idle 691 * state. We wait 1ms to give cards time to 692 * respond. 693 */ 694 mmc_go_idle(host); 695 696 /* 697 * If SD_SEND_IF_COND indicates an SD 2.0 698 * compliant card and we should set bit 30 699 * of the ocr to indicate that we can handle 700 * block-addressed SDHC cards. 701 */ 702 err = mmc_send_if_cond(host, ocr); 703 if (!err) 704 ocr |= SD_OCR_CCS; 705 706 /* 707 * If the host supports one of UHS-I modes, request the card 708 * to switch to 1.8V signaling level. 709 */ 710 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 711 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)) 712 ocr |= SD_OCR_S18R; 713 714 /* If the host can supply more than 150mA, XPC should be set to 1. */ 715 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 | 716 MMC_CAP_SET_XPC_180)) 717 ocr |= SD_OCR_XPC; 718 719 try_again: 720 err = mmc_send_app_op_cond(host, ocr, rocr); 721 if (err) 722 return err; 723 724 /* 725 * In case CCS and S18A in the response is set, start Signal Voltage 726 * Switch procedure. SPI mode doesn't support CMD11. 727 */ 728 if (!mmc_host_is_spi(host) && rocr && 729 ((*rocr & 0x41000000) == 0x41000000)) { 730 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true); 731 if (err) { 732 ocr &= ~SD_OCR_S18R; 733 goto try_again; 734 } 735 } 736 737 if (mmc_host_is_spi(host)) 738 err = mmc_send_cid(host, cid); 739 else 740 err = mmc_all_send_cid(host, cid); 741 742 return err; 743 } 744 745 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 746 { 747 int err; 748 749 /* 750 * Fetch CSD from card. 751 */ 752 err = mmc_send_csd(card, card->raw_csd); 753 if (err) 754 return err; 755 756 err = mmc_decode_csd(card); 757 if (err) 758 return err; 759 760 return 0; 761 } 762 763 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 764 bool reinit) 765 { 766 int err; 767 768 if (!reinit) { 769 /* 770 * Fetch SCR from card. 771 */ 772 err = mmc_app_send_scr(card, card->raw_scr); 773 if (err) 774 return err; 775 776 err = mmc_decode_scr(card); 777 if (err) 778 return err; 779 780 /* 781 * Fetch and process SD Status register. 782 */ 783 err = mmc_read_ssr(card); 784 if (err) 785 return err; 786 787 /* Erase init depends on CSD and SSR */ 788 mmc_init_erase(card); 789 790 /* 791 * Fetch switch information from card. 792 */ 793 err = mmc_read_switch(card); 794 if (err) 795 return err; 796 } 797 798 /* 799 * For SPI, enable CRC as appropriate. 800 * This CRC enable is located AFTER the reading of the 801 * card registers because some SDHC cards are not able 802 * to provide valid CRCs for non-512-byte blocks. 803 */ 804 if (mmc_host_is_spi(host)) { 805 err = mmc_spi_set_crc(host, use_spi_crc); 806 if (err) 807 return err; 808 } 809 810 /* 811 * Check if read-only switch is active. 812 */ 813 if (!reinit) { 814 int ro = -1; 815 816 if (host->ops->get_ro) 817 ro = host->ops->get_ro(host); 818 819 if (ro < 0) { 820 printk(KERN_WARNING "%s: host does not " 821 "support reading read-only " 822 "switch. assuming write-enable.\n", 823 mmc_hostname(host)); 824 } else if (ro > 0) { 825 mmc_card_set_readonly(card); 826 } 827 } 828 829 return 0; 830 } 831 832 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 833 { 834 unsigned max_dtr = (unsigned int)-1; 835 836 if (mmc_card_highspeed(card)) { 837 if (max_dtr > card->sw_caps.hs_max_dtr) 838 max_dtr = card->sw_caps.hs_max_dtr; 839 } else if (max_dtr > card->csd.max_dtr) { 840 max_dtr = card->csd.max_dtr; 841 } 842 843 return max_dtr; 844 } 845 846 void mmc_sd_go_highspeed(struct mmc_card *card) 847 { 848 mmc_card_set_highspeed(card); 849 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 850 } 851 852 /* 853 * Handle the detection and initialisation of a card. 854 * 855 * In the case of a resume, "oldcard" will contain the card 856 * we're trying to reinitialise. 857 */ 858 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 859 struct mmc_card *oldcard) 860 { 861 struct mmc_card *card; 862 int err; 863 u32 cid[4]; 864 u32 rocr = 0; 865 866 BUG_ON(!host); 867 WARN_ON(!host->claimed); 868 869 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 870 if (err) 871 return err; 872 873 if (oldcard) { 874 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 875 return -ENOENT; 876 877 card = oldcard; 878 } else { 879 /* 880 * Allocate card structure. 881 */ 882 card = mmc_alloc_card(host, &sd_type); 883 if (IS_ERR(card)) 884 return PTR_ERR(card); 885 886 card->type = MMC_TYPE_SD; 887 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 888 } 889 890 /* 891 * For native busses: get card RCA and quit open drain mode. 892 */ 893 if (!mmc_host_is_spi(host)) { 894 err = mmc_send_relative_addr(host, &card->rca); 895 if (err) 896 return err; 897 898 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); 899 } 900 901 if (!oldcard) { 902 err = mmc_sd_get_csd(host, card); 903 if (err) 904 return err; 905 906 mmc_decode_cid(card); 907 } 908 909 /* 910 * Select card, as all following commands rely on that. 911 */ 912 if (!mmc_host_is_spi(host)) { 913 err = mmc_select_card(card); 914 if (err) 915 return err; 916 } 917 918 err = mmc_sd_setup_card(host, card, oldcard != NULL); 919 if (err) 920 goto free_card; 921 922 /* Initialization sequence for UHS-I cards */ 923 if (rocr & SD_ROCR_S18A) { 924 err = mmc_sd_init_uhs_card(card); 925 if (err) 926 goto free_card; 927 928 /* Card is an ultra-high-speed card */ 929 mmc_sd_card_set_uhs(card); 930 931 /* 932 * Since initialization is now complete, enable preset 933 * value registers for UHS-I cards. 934 */ 935 if (host->ops->enable_preset_value) 936 host->ops->enable_preset_value(host, true); 937 } else { 938 /* 939 * Attempt to change to high-speed (if supported) 940 */ 941 err = mmc_sd_switch_hs(card); 942 if (err > 0) 943 mmc_sd_go_highspeed(card); 944 else if (err) 945 goto free_card; 946 947 /* 948 * Set bus speed. 949 */ 950 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 951 952 /* 953 * Switch to wider bus (if supported). 954 */ 955 if ((host->caps & MMC_CAP_4_BIT_DATA) && 956 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 957 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 958 if (err) 959 goto free_card; 960 961 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 962 } 963 } 964 965 host->card = card; 966 return 0; 967 968 free_card: 969 if (!oldcard) 970 mmc_remove_card(card); 971 972 return err; 973 } 974 975 /* 976 * Host is being removed. Free up the current card. 977 */ 978 static void mmc_sd_remove(struct mmc_host *host) 979 { 980 BUG_ON(!host); 981 BUG_ON(!host->card); 982 983 mmc_remove_card(host->card); 984 host->card = NULL; 985 } 986 987 /* 988 * Card detection callback from host. 989 */ 990 static void mmc_sd_detect(struct mmc_host *host) 991 { 992 int err; 993 994 BUG_ON(!host); 995 BUG_ON(!host->card); 996 997 mmc_claim_host(host); 998 999 /* 1000 * Just check if our card has been removed. 1001 */ 1002 err = mmc_send_status(host->card, NULL); 1003 1004 mmc_release_host(host); 1005 1006 if (err) { 1007 mmc_sd_remove(host); 1008 1009 mmc_claim_host(host); 1010 mmc_detach_bus(host); 1011 mmc_release_host(host); 1012 } 1013 } 1014 1015 /* 1016 * Suspend callback from host. 1017 */ 1018 static int mmc_sd_suspend(struct mmc_host *host) 1019 { 1020 BUG_ON(!host); 1021 BUG_ON(!host->card); 1022 1023 mmc_claim_host(host); 1024 if (!mmc_host_is_spi(host)) 1025 mmc_deselect_cards(host); 1026 host->card->state &= ~MMC_STATE_HIGHSPEED; 1027 mmc_release_host(host); 1028 1029 return 0; 1030 } 1031 1032 /* 1033 * Resume callback from host. 1034 * 1035 * This function tries to determine if the same card is still present 1036 * and, if so, restore all state to it. 1037 */ 1038 static int mmc_sd_resume(struct mmc_host *host) 1039 { 1040 int err; 1041 1042 BUG_ON(!host); 1043 BUG_ON(!host->card); 1044 1045 mmc_claim_host(host); 1046 err = mmc_sd_init_card(host, host->ocr, host->card); 1047 mmc_release_host(host); 1048 1049 return err; 1050 } 1051 1052 static int mmc_sd_power_restore(struct mmc_host *host) 1053 { 1054 int ret; 1055 1056 host->card->state &= ~MMC_STATE_HIGHSPEED; 1057 mmc_claim_host(host); 1058 ret = mmc_sd_init_card(host, host->ocr, host->card); 1059 mmc_release_host(host); 1060 1061 return ret; 1062 } 1063 1064 static const struct mmc_bus_ops mmc_sd_ops = { 1065 .remove = mmc_sd_remove, 1066 .detect = mmc_sd_detect, 1067 .suspend = NULL, 1068 .resume = NULL, 1069 .power_restore = mmc_sd_power_restore, 1070 }; 1071 1072 static const struct mmc_bus_ops mmc_sd_ops_unsafe = { 1073 .remove = mmc_sd_remove, 1074 .detect = mmc_sd_detect, 1075 .suspend = mmc_sd_suspend, 1076 .resume = mmc_sd_resume, 1077 .power_restore = mmc_sd_power_restore, 1078 }; 1079 1080 static void mmc_sd_attach_bus_ops(struct mmc_host *host) 1081 { 1082 const struct mmc_bus_ops *bus_ops; 1083 1084 if (!mmc_card_is_removable(host)) 1085 bus_ops = &mmc_sd_ops_unsafe; 1086 else 1087 bus_ops = &mmc_sd_ops; 1088 mmc_attach_bus(host, bus_ops); 1089 } 1090 1091 /* 1092 * Starting point for SD card init. 1093 */ 1094 int mmc_attach_sd(struct mmc_host *host) 1095 { 1096 int err; 1097 u32 ocr; 1098 1099 BUG_ON(!host); 1100 WARN_ON(!host->claimed); 1101 1102 /* Make sure we are at 3.3V signalling voltage */ 1103 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false); 1104 if (err) 1105 return err; 1106 1107 /* Disable preset value enable if already set since last time */ 1108 if (host->ops->enable_preset_value) 1109 host->ops->enable_preset_value(host, false); 1110 1111 err = mmc_send_app_op_cond(host, 0, &ocr); 1112 if (err) 1113 return err; 1114 1115 mmc_sd_attach_bus_ops(host); 1116 if (host->ocr_avail_sd) 1117 host->ocr_avail = host->ocr_avail_sd; 1118 1119 /* 1120 * We need to get OCR a different way for SPI. 1121 */ 1122 if (mmc_host_is_spi(host)) { 1123 mmc_go_idle(host); 1124 1125 err = mmc_spi_read_ocr(host, 0, &ocr); 1126 if (err) 1127 goto err; 1128 } 1129 1130 /* 1131 * Sanity check the voltages that the card claims to 1132 * support. 1133 */ 1134 if (ocr & 0x7F) { 1135 printk(KERN_WARNING "%s: card claims to support voltages " 1136 "below the defined range. These will be ignored.\n", 1137 mmc_hostname(host)); 1138 ocr &= ~0x7F; 1139 } 1140 1141 if ((ocr & MMC_VDD_165_195) && 1142 !(host->ocr_avail_sd & MMC_VDD_165_195)) { 1143 printk(KERN_WARNING "%s: SD card claims to support the " 1144 "incompletely defined 'low voltage range'. This " 1145 "will be ignored.\n", mmc_hostname(host)); 1146 ocr &= ~MMC_VDD_165_195; 1147 } 1148 1149 host->ocr = mmc_select_voltage(host, ocr); 1150 1151 /* 1152 * Can we support the voltage(s) of the card(s)? 1153 */ 1154 if (!host->ocr) { 1155 err = -EINVAL; 1156 goto err; 1157 } 1158 1159 /* 1160 * Detect and init the card. 1161 */ 1162 err = mmc_sd_init_card(host, host->ocr, NULL); 1163 if (err) 1164 goto err; 1165 1166 mmc_release_host(host); 1167 err = mmc_add_card(host->card); 1168 mmc_claim_host(host); 1169 if (err) 1170 goto remove_card; 1171 1172 return 0; 1173 1174 remove_card: 1175 mmc_release_host(host); 1176 mmc_remove_card(host->card); 1177 host->card = NULL; 1178 mmc_claim_host(host); 1179 err: 1180 mmc_detach_bus(host); 1181 1182 printk(KERN_ERR "%s: error %d whilst initialising SD card\n", 1183 mmc_hostname(host), err); 1184 1185 return err; 1186 } 1187 1188