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 #include <linux/stat.h> 16 17 #include <linux/mmc/host.h> 18 #include <linux/mmc/card.h> 19 #include <linux/mmc/mmc.h> 20 #include <linux/mmc/sd.h> 21 22 #include "core.h" 23 #include "bus.h" 24 #include "mmc_ops.h" 25 #include "sd.h" 26 #include "sd_ops.h" 27 28 static const unsigned int tran_exp[] = { 29 10000, 100000, 1000000, 10000000, 30 0, 0, 0, 0 31 }; 32 33 static const unsigned char tran_mant[] = { 34 0, 10, 12, 13, 15, 20, 25, 30, 35 35, 40, 45, 50, 55, 60, 70, 80, 36 }; 37 38 static const unsigned int tacc_exp[] = { 39 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 40 }; 41 42 static const unsigned int tacc_mant[] = { 43 0, 10, 12, 13, 15, 20, 25, 30, 44 35, 40, 45, 50, 55, 60, 70, 80, 45 }; 46 47 #define UNSTUFF_BITS(resp,start,size) \ 48 ({ \ 49 const int __size = size; \ 50 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 51 const int __off = 3 - ((start) / 32); \ 52 const int __shft = (start) & 31; \ 53 u32 __res; \ 54 \ 55 __res = resp[__off] >> __shft; \ 56 if (__size + __shft > 32) \ 57 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 58 __res & __mask; \ 59 }) 60 61 /* 62 * Given the decoded CSD structure, decode the raw CID to our CID structure. 63 */ 64 void mmc_decode_cid(struct mmc_card *card) 65 { 66 u32 *resp = card->raw_cid; 67 68 memset(&card->cid, 0, sizeof(struct mmc_cid)); 69 70 /* 71 * SD doesn't currently have a version field so we will 72 * have to assume we can parse this. 73 */ 74 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 75 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 76 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 77 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 78 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 79 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 80 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 81 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); 82 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); 83 card->cid.serial = UNSTUFF_BITS(resp, 24, 32); 84 card->cid.year = UNSTUFF_BITS(resp, 12, 8); 85 card->cid.month = UNSTUFF_BITS(resp, 8, 4); 86 87 card->cid.year += 2000; /* SD cards year offset */ 88 } 89 90 /* 91 * Given a 128-bit response, decode to our card CSD structure. 92 */ 93 static int mmc_decode_csd(struct mmc_card *card) 94 { 95 struct mmc_csd *csd = &card->csd; 96 unsigned int e, m, csd_struct; 97 u32 *resp = card->raw_csd; 98 99 csd_struct = UNSTUFF_BITS(resp, 126, 2); 100 101 switch (csd_struct) { 102 case 0: 103 m = UNSTUFF_BITS(resp, 115, 4); 104 e = UNSTUFF_BITS(resp, 112, 3); 105 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 106 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 107 108 m = UNSTUFF_BITS(resp, 99, 4); 109 e = UNSTUFF_BITS(resp, 96, 3); 110 csd->max_dtr = tran_exp[e] * tran_mant[m]; 111 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 112 113 e = UNSTUFF_BITS(resp, 47, 3); 114 m = UNSTUFF_BITS(resp, 62, 12); 115 csd->capacity = (1 + m) << (e + 2); 116 117 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 118 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 119 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 120 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 121 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 122 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 123 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 124 125 if (UNSTUFF_BITS(resp, 46, 1)) { 126 csd->erase_size = 1; 127 } else if (csd->write_blkbits >= 9) { 128 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; 129 csd->erase_size <<= csd->write_blkbits - 9; 130 } 131 break; 132 case 1: 133 /* 134 * This is a block-addressed SDHC or SDXC card. Most 135 * interesting fields are unused and have fixed 136 * values. To avoid getting tripped by buggy cards, 137 * we assume those fixed values ourselves. 138 */ 139 mmc_card_set_blockaddr(card); 140 141 csd->tacc_ns = 0; /* Unused */ 142 csd->tacc_clks = 0; /* Unused */ 143 144 m = UNSTUFF_BITS(resp, 99, 4); 145 e = UNSTUFF_BITS(resp, 96, 3); 146 csd->max_dtr = tran_exp[e] * tran_mant[m]; 147 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 148 csd->c_size = UNSTUFF_BITS(resp, 48, 22); 149 150 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */ 151 if (csd->c_size >= 0xFFFF) 152 mmc_card_set_ext_capacity(card); 153 154 m = UNSTUFF_BITS(resp, 48, 22); 155 csd->capacity = (1 + m) << 10; 156 157 csd->read_blkbits = 9; 158 csd->read_partial = 0; 159 csd->write_misalign = 0; 160 csd->read_misalign = 0; 161 csd->r2w_factor = 4; /* Unused */ 162 csd->write_blkbits = 9; 163 csd->write_partial = 0; 164 csd->erase_size = 1; 165 break; 166 default: 167 pr_err("%s: unrecognised CSD structure version %d\n", 168 mmc_hostname(card->host), csd_struct); 169 return -EINVAL; 170 } 171 172 card->erase_size = csd->erase_size; 173 174 return 0; 175 } 176 177 /* 178 * Given a 64-bit response, decode to our card SCR structure. 179 */ 180 static int mmc_decode_scr(struct mmc_card *card) 181 { 182 struct sd_scr *scr = &card->scr; 183 unsigned int scr_struct; 184 u32 resp[4]; 185 186 resp[3] = card->raw_scr[1]; 187 resp[2] = card->raw_scr[0]; 188 189 scr_struct = UNSTUFF_BITS(resp, 60, 4); 190 if (scr_struct != 0) { 191 pr_err("%s: unrecognised SCR structure version %d\n", 192 mmc_hostname(card->host), scr_struct); 193 return -EINVAL; 194 } 195 196 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 197 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 198 if (scr->sda_vsn == SCR_SPEC_VER_2) 199 /* Check if Physical Layer Spec v3.0 is supported */ 200 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); 201 202 if (UNSTUFF_BITS(resp, 55, 1)) 203 card->erased_byte = 0xFF; 204 else 205 card->erased_byte = 0x0; 206 207 if (scr->sda_spec3) 208 scr->cmds = UNSTUFF_BITS(resp, 32, 2); 209 return 0; 210 } 211 212 /* 213 * Fetch and process SD Status register. 214 */ 215 static int mmc_read_ssr(struct mmc_card *card) 216 { 217 unsigned int au, es, et, eo; 218 int err, i; 219 u32 *ssr; 220 221 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 222 pr_warning("%s: card lacks mandatory SD Status " 223 "function.\n", mmc_hostname(card->host)); 224 return 0; 225 } 226 227 ssr = kmalloc(64, GFP_KERNEL); 228 if (!ssr) 229 return -ENOMEM; 230 231 err = mmc_app_sd_status(card, ssr); 232 if (err) { 233 pr_warning("%s: problem reading SD Status " 234 "register.\n", mmc_hostname(card->host)); 235 err = 0; 236 goto out; 237 } 238 239 for (i = 0; i < 16; i++) 240 ssr[i] = be32_to_cpu(ssr[i]); 241 242 /* 243 * UNSTUFF_BITS only works with four u32s so we have to offset the 244 * bitfield positions accordingly. 245 */ 246 au = UNSTUFF_BITS(ssr, 428 - 384, 4); 247 if (au > 0 && au <= 9) { 248 card->ssr.au = 1 << (au + 4); 249 es = UNSTUFF_BITS(ssr, 408 - 384, 16); 250 et = UNSTUFF_BITS(ssr, 402 - 384, 6); 251 eo = UNSTUFF_BITS(ssr, 400 - 384, 2); 252 if (es && et) { 253 card->ssr.erase_timeout = (et * 1000) / es; 254 card->ssr.erase_offset = eo * 1000; 255 } 256 } else { 257 pr_warning("%s: SD Status: Invalid Allocation Unit " 258 "size.\n", mmc_hostname(card->host)); 259 } 260 out: 261 kfree(ssr); 262 return err; 263 } 264 265 /* 266 * Fetches and decodes switch information 267 */ 268 static int mmc_read_switch(struct mmc_card *card) 269 { 270 int err; 271 u8 *status; 272 273 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 274 return 0; 275 276 if (!(card->csd.cmdclass & CCC_SWITCH)) { 277 pr_warning("%s: card lacks mandatory switch " 278 "function, performance might suffer.\n", 279 mmc_hostname(card->host)); 280 return 0; 281 } 282 283 err = -EIO; 284 285 status = kmalloc(64, GFP_KERNEL); 286 if (!status) { 287 pr_err("%s: could not allocate a buffer for " 288 "switch capabilities.\n", 289 mmc_hostname(card->host)); 290 return -ENOMEM; 291 } 292 293 /* 294 * Find out the card's support bits with a mode 0 operation. 295 * The argument does not matter, as the support bits do not 296 * change with the arguments. 297 */ 298 err = mmc_sd_switch(card, 0, 0, 0, status); 299 if (err) { 300 /* 301 * If the host or the card can't do the switch, 302 * fail more gracefully. 303 */ 304 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 305 goto out; 306 307 pr_warning("%s: problem reading Bus Speed modes.\n", 308 mmc_hostname(card->host)); 309 err = 0; 310 311 goto out; 312 } 313 314 if (status[13] & SD_MODE_HIGH_SPEED) 315 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; 316 317 if (card->scr.sda_spec3) { 318 card->sw_caps.sd3_bus_mode = status[13]; 319 /* Driver Strengths supported by the card */ 320 card->sw_caps.sd3_drv_type = status[9]; 321 } 322 323 out: 324 kfree(status); 325 326 return err; 327 } 328 329 /* 330 * Test if the card supports high-speed mode and, if so, switch to it. 331 */ 332 int mmc_sd_switch_hs(struct mmc_card *card) 333 { 334 int err; 335 u8 *status; 336 337 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 338 return 0; 339 340 if (!(card->csd.cmdclass & CCC_SWITCH)) 341 return 0; 342 343 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 344 return 0; 345 346 if (card->sw_caps.hs_max_dtr == 0) 347 return 0; 348 349 err = -EIO; 350 351 status = kmalloc(64, GFP_KERNEL); 352 if (!status) { 353 pr_err("%s: could not allocate a buffer for " 354 "switch capabilities.\n", mmc_hostname(card->host)); 355 return -ENOMEM; 356 } 357 358 err = mmc_sd_switch(card, 1, 0, 1, status); 359 if (err) 360 goto out; 361 362 if ((status[16] & 0xF) != 1) { 363 pr_warning("%s: Problem switching card " 364 "into high-speed mode!\n", 365 mmc_hostname(card->host)); 366 err = 0; 367 } else { 368 err = 1; 369 } 370 371 out: 372 kfree(status); 373 374 return err; 375 } 376 377 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 378 { 379 int host_drv_type = SD_DRIVER_TYPE_B; 380 int card_drv_type = SD_DRIVER_TYPE_B; 381 int drive_strength; 382 int err; 383 384 /* 385 * If the host doesn't support any of the Driver Types A,C or D, 386 * or there is no board specific handler then default Driver 387 * Type B is used. 388 */ 389 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C 390 | MMC_CAP_DRIVER_TYPE_D))) 391 return 0; 392 393 if (!card->host->ops->select_drive_strength) 394 return 0; 395 396 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) 397 host_drv_type |= SD_DRIVER_TYPE_A; 398 399 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) 400 host_drv_type |= SD_DRIVER_TYPE_C; 401 402 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) 403 host_drv_type |= SD_DRIVER_TYPE_D; 404 405 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) 406 card_drv_type |= SD_DRIVER_TYPE_A; 407 408 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 409 card_drv_type |= SD_DRIVER_TYPE_C; 410 411 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D) 412 card_drv_type |= SD_DRIVER_TYPE_D; 413 414 /* 415 * The drive strength that the hardware can support 416 * depends on the board design. Pass the appropriate 417 * information and let the hardware specific code 418 * return what is possible given the options 419 */ 420 mmc_host_clk_hold(card->host); 421 drive_strength = card->host->ops->select_drive_strength( 422 card->sw_caps.uhs_max_dtr, 423 host_drv_type, card_drv_type); 424 mmc_host_clk_release(card->host); 425 426 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 427 if (err) 428 return err; 429 430 if ((status[15] & 0xF) != drive_strength) { 431 pr_warning("%s: Problem setting drive strength!\n", 432 mmc_hostname(card->host)); 433 return 0; 434 } 435 436 mmc_set_driver_type(card->host, drive_strength); 437 438 return 0; 439 } 440 441 static void sd_update_bus_speed_mode(struct mmc_card *card) 442 { 443 /* 444 * If the host doesn't support any of the UHS-I modes, fallback on 445 * default speed. 446 */ 447 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 448 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) { 449 card->sd_bus_speed = 0; 450 return; 451 } 452 453 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 454 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 455 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 456 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 457 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 458 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 459 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 460 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 461 SD_MODE_UHS_SDR50)) { 462 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 463 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 464 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 465 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 466 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 467 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 468 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 469 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 470 SD_MODE_UHS_SDR12)) { 471 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 472 } 473 } 474 475 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 476 { 477 int err; 478 unsigned int timing = 0; 479 480 switch (card->sd_bus_speed) { 481 case UHS_SDR104_BUS_SPEED: 482 timing = MMC_TIMING_UHS_SDR104; 483 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 484 break; 485 case UHS_DDR50_BUS_SPEED: 486 timing = MMC_TIMING_UHS_DDR50; 487 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 488 break; 489 case UHS_SDR50_BUS_SPEED: 490 timing = MMC_TIMING_UHS_SDR50; 491 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 492 break; 493 case UHS_SDR25_BUS_SPEED: 494 timing = MMC_TIMING_UHS_SDR25; 495 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 496 break; 497 case UHS_SDR12_BUS_SPEED: 498 timing = MMC_TIMING_UHS_SDR12; 499 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 500 break; 501 default: 502 return 0; 503 } 504 505 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 506 if (err) 507 return err; 508 509 if ((status[16] & 0xF) != card->sd_bus_speed) 510 pr_warning("%s: Problem setting bus speed mode!\n", 511 mmc_hostname(card->host)); 512 else { 513 mmc_set_timing(card->host, timing); 514 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 515 } 516 517 return 0; 518 } 519 520 /* Get host's max current setting at its current voltage */ 521 static u32 sd_get_host_max_current(struct mmc_host *host) 522 { 523 u32 voltage, max_current; 524 525 voltage = 1 << host->ios.vdd; 526 switch (voltage) { 527 case MMC_VDD_165_195: 528 max_current = host->max_current_180; 529 break; 530 case MMC_VDD_29_30: 531 case MMC_VDD_30_31: 532 max_current = host->max_current_300; 533 break; 534 case MMC_VDD_32_33: 535 case MMC_VDD_33_34: 536 max_current = host->max_current_330; 537 break; 538 default: 539 max_current = 0; 540 } 541 542 return max_current; 543 } 544 545 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 546 { 547 int current_limit = SD_SET_CURRENT_NO_CHANGE; 548 int err; 549 u32 max_current; 550 551 /* 552 * Current limit switch is only defined for SDR50, SDR104, and DDR50 553 * bus speed modes. For other bus speed modes, we do not change the 554 * current limit. 555 */ 556 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && 557 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && 558 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) 559 return 0; 560 561 /* 562 * Host has different current capabilities when operating at 563 * different voltages, so find out its max current first. 564 */ 565 max_current = sd_get_host_max_current(card->host); 566 567 /* 568 * We only check host's capability here, if we set a limit that is 569 * higher than the card's maximum current, the card will be using its 570 * maximum current, e.g. if the card's maximum current is 300ma, and 571 * when we set current limit to 200ma, the card will draw 200ma, and 572 * when we set current limit to 400/600/800ma, the card will draw its 573 * maximum 300ma from the host. 574 */ 575 if (max_current >= 800) 576 current_limit = SD_SET_CURRENT_LIMIT_800; 577 else if (max_current >= 600) 578 current_limit = SD_SET_CURRENT_LIMIT_600; 579 else if (max_current >= 400) 580 current_limit = SD_SET_CURRENT_LIMIT_400; 581 else if (max_current >= 200) 582 current_limit = SD_SET_CURRENT_LIMIT_200; 583 584 if (current_limit != SD_SET_CURRENT_NO_CHANGE) { 585 err = mmc_sd_switch(card, 1, 3, current_limit, status); 586 if (err) 587 return err; 588 589 if (((status[15] >> 4) & 0x0F) != current_limit) 590 pr_warning("%s: Problem setting current limit!\n", 591 mmc_hostname(card->host)); 592 593 } 594 595 return 0; 596 } 597 598 /* 599 * UHS-I specific initialization procedure 600 */ 601 static int mmc_sd_init_uhs_card(struct mmc_card *card) 602 { 603 int err; 604 u8 *status; 605 606 if (!card->scr.sda_spec3) 607 return 0; 608 609 if (!(card->csd.cmdclass & CCC_SWITCH)) 610 return 0; 611 612 status = kmalloc(64, GFP_KERNEL); 613 if (!status) { 614 pr_err("%s: could not allocate a buffer for " 615 "switch capabilities.\n", mmc_hostname(card->host)); 616 return -ENOMEM; 617 } 618 619 /* Set 4-bit bus width */ 620 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 621 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 622 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 623 if (err) 624 goto out; 625 626 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 627 } 628 629 /* 630 * Select the bus speed mode depending on host 631 * and card capability. 632 */ 633 sd_update_bus_speed_mode(card); 634 635 /* Set the driver strength for the card */ 636 err = sd_select_driver_type(card, status); 637 if (err) 638 goto out; 639 640 /* Set current limit for the card */ 641 err = sd_set_current_limit(card, status); 642 if (err) 643 goto out; 644 645 /* Set bus speed mode of the card */ 646 err = sd_set_bus_speed_mode(card, status); 647 if (err) 648 goto out; 649 650 /* SPI mode doesn't define CMD19 */ 651 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) { 652 mmc_host_clk_hold(card->host); 653 err = card->host->ops->execute_tuning(card->host, 654 MMC_SEND_TUNING_BLOCK); 655 mmc_host_clk_release(card->host); 656 } 657 658 out: 659 kfree(status); 660 661 return err; 662 } 663 664 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 665 card->raw_cid[2], card->raw_cid[3]); 666 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 667 card->raw_csd[2], card->raw_csd[3]); 668 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 669 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 670 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 671 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 672 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 673 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 674 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 675 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 676 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 677 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 678 679 680 static struct attribute *sd_std_attrs[] = { 681 &dev_attr_cid.attr, 682 &dev_attr_csd.attr, 683 &dev_attr_scr.attr, 684 &dev_attr_date.attr, 685 &dev_attr_erase_size.attr, 686 &dev_attr_preferred_erase_size.attr, 687 &dev_attr_fwrev.attr, 688 &dev_attr_hwrev.attr, 689 &dev_attr_manfid.attr, 690 &dev_attr_name.attr, 691 &dev_attr_oemid.attr, 692 &dev_attr_serial.attr, 693 NULL, 694 }; 695 696 static struct attribute_group sd_std_attr_group = { 697 .attrs = sd_std_attrs, 698 }; 699 700 static const struct attribute_group *sd_attr_groups[] = { 701 &sd_std_attr_group, 702 NULL, 703 }; 704 705 struct device_type sd_type = { 706 .groups = sd_attr_groups, 707 }; 708 709 /* 710 * Fetch CID from card. 711 */ 712 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 713 { 714 int err; 715 u32 max_current; 716 717 /* 718 * Since we're changing the OCR value, we seem to 719 * need to tell some cards to go back to the idle 720 * state. We wait 1ms to give cards time to 721 * respond. 722 */ 723 mmc_go_idle(host); 724 725 /* 726 * If SD_SEND_IF_COND indicates an SD 2.0 727 * compliant card and we should set bit 30 728 * of the ocr to indicate that we can handle 729 * block-addressed SDHC cards. 730 */ 731 err = mmc_send_if_cond(host, ocr); 732 if (!err) 733 ocr |= SD_OCR_CCS; 734 735 /* 736 * If the host supports one of UHS-I modes, request the card 737 * to switch to 1.8V signaling level. 738 */ 739 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 740 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)) 741 ocr |= SD_OCR_S18R; 742 743 /* 744 * If the host can supply more than 150mA at current voltage, 745 * XPC should be set to 1. 746 */ 747 max_current = sd_get_host_max_current(host); 748 if (max_current > 150) 749 ocr |= SD_OCR_XPC; 750 751 try_again: 752 err = mmc_send_app_op_cond(host, ocr, rocr); 753 if (err) 754 return err; 755 756 /* 757 * In case CCS and S18A in the response is set, start Signal Voltage 758 * Switch procedure. SPI mode doesn't support CMD11. 759 */ 760 if (!mmc_host_is_spi(host) && rocr && 761 ((*rocr & 0x41000000) == 0x41000000)) { 762 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true); 763 if (err) { 764 ocr &= ~SD_OCR_S18R; 765 goto try_again; 766 } 767 } 768 769 if (mmc_host_is_spi(host)) 770 err = mmc_send_cid(host, cid); 771 else 772 err = mmc_all_send_cid(host, cid); 773 774 return err; 775 } 776 777 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 778 { 779 int err; 780 781 /* 782 * Fetch CSD from card. 783 */ 784 err = mmc_send_csd(card, card->raw_csd); 785 if (err) 786 return err; 787 788 err = mmc_decode_csd(card); 789 if (err) 790 return err; 791 792 return 0; 793 } 794 795 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 796 bool reinit) 797 { 798 int err; 799 800 if (!reinit) { 801 /* 802 * Fetch SCR from card. 803 */ 804 err = mmc_app_send_scr(card, card->raw_scr); 805 if (err) 806 return err; 807 808 err = mmc_decode_scr(card); 809 if (err) 810 return err; 811 812 /* 813 * Fetch and process SD Status register. 814 */ 815 err = mmc_read_ssr(card); 816 if (err) 817 return err; 818 819 /* Erase init depends on CSD and SSR */ 820 mmc_init_erase(card); 821 822 /* 823 * Fetch switch information from card. 824 */ 825 err = mmc_read_switch(card); 826 if (err) 827 return err; 828 } 829 830 /* 831 * For SPI, enable CRC as appropriate. 832 * This CRC enable is located AFTER the reading of the 833 * card registers because some SDHC cards are not able 834 * to provide valid CRCs for non-512-byte blocks. 835 */ 836 if (mmc_host_is_spi(host)) { 837 err = mmc_spi_set_crc(host, use_spi_crc); 838 if (err) 839 return err; 840 } 841 842 /* 843 * Check if read-only switch is active. 844 */ 845 if (!reinit) { 846 int ro = -1; 847 848 if (host->ops->get_ro) { 849 mmc_host_clk_hold(card->host); 850 ro = host->ops->get_ro(host); 851 mmc_host_clk_release(card->host); 852 } 853 854 if (ro < 0) { 855 pr_warning("%s: host does not " 856 "support reading read-only " 857 "switch. assuming write-enable.\n", 858 mmc_hostname(host)); 859 } else if (ro > 0) { 860 mmc_card_set_readonly(card); 861 } 862 } 863 864 return 0; 865 } 866 867 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 868 { 869 unsigned max_dtr = (unsigned int)-1; 870 871 if (mmc_card_highspeed(card)) { 872 if (max_dtr > card->sw_caps.hs_max_dtr) 873 max_dtr = card->sw_caps.hs_max_dtr; 874 } else if (max_dtr > card->csd.max_dtr) { 875 max_dtr = card->csd.max_dtr; 876 } 877 878 return max_dtr; 879 } 880 881 void mmc_sd_go_highspeed(struct mmc_card *card) 882 { 883 mmc_card_set_highspeed(card); 884 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 885 } 886 887 /* 888 * Handle the detection and initialisation of a card. 889 * 890 * In the case of a resume, "oldcard" will contain the card 891 * we're trying to reinitialise. 892 */ 893 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 894 struct mmc_card *oldcard) 895 { 896 struct mmc_card *card; 897 int err; 898 u32 cid[4]; 899 u32 rocr = 0; 900 901 BUG_ON(!host); 902 WARN_ON(!host->claimed); 903 904 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 905 if (err) 906 return err; 907 908 if (oldcard) { 909 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 910 return -ENOENT; 911 912 card = oldcard; 913 } else { 914 /* 915 * Allocate card structure. 916 */ 917 card = mmc_alloc_card(host, &sd_type); 918 if (IS_ERR(card)) 919 return PTR_ERR(card); 920 921 card->type = MMC_TYPE_SD; 922 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 923 } 924 925 /* 926 * For native busses: get card RCA and quit open drain mode. 927 */ 928 if (!mmc_host_is_spi(host)) { 929 err = mmc_send_relative_addr(host, &card->rca); 930 if (err) 931 return err; 932 } 933 934 if (!oldcard) { 935 err = mmc_sd_get_csd(host, card); 936 if (err) 937 return err; 938 939 mmc_decode_cid(card); 940 } 941 942 /* 943 * Select card, as all following commands rely on that. 944 */ 945 if (!mmc_host_is_spi(host)) { 946 err = mmc_select_card(card); 947 if (err) 948 return err; 949 } 950 951 err = mmc_sd_setup_card(host, card, oldcard != NULL); 952 if (err) 953 goto free_card; 954 955 /* Initialization sequence for UHS-I cards */ 956 if (rocr & SD_ROCR_S18A) { 957 err = mmc_sd_init_uhs_card(card); 958 if (err) 959 goto free_card; 960 961 /* Card is an ultra-high-speed card */ 962 mmc_card_set_uhs(card); 963 964 /* 965 * Since initialization is now complete, enable preset 966 * value registers for UHS-I cards. 967 */ 968 if (host->ops->enable_preset_value) { 969 mmc_host_clk_hold(card->host); 970 host->ops->enable_preset_value(host, true); 971 mmc_host_clk_release(card->host); 972 } 973 } else { 974 /* 975 * Attempt to change to high-speed (if supported) 976 */ 977 err = mmc_sd_switch_hs(card); 978 if (err > 0) 979 mmc_sd_go_highspeed(card); 980 else if (err) 981 goto free_card; 982 983 /* 984 * Set bus speed. 985 */ 986 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 987 988 /* 989 * Switch to wider bus (if supported). 990 */ 991 if ((host->caps & MMC_CAP_4_BIT_DATA) && 992 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 993 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 994 if (err) 995 goto free_card; 996 997 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 998 } 999 } 1000 1001 host->card = card; 1002 return 0; 1003 1004 free_card: 1005 if (!oldcard) 1006 mmc_remove_card(card); 1007 1008 return err; 1009 } 1010 1011 /* 1012 * Host is being removed. Free up the current card. 1013 */ 1014 static void mmc_sd_remove(struct mmc_host *host) 1015 { 1016 BUG_ON(!host); 1017 BUG_ON(!host->card); 1018 1019 mmc_remove_card(host->card); 1020 host->card = NULL; 1021 } 1022 1023 /* 1024 * Card detection - card is alive. 1025 */ 1026 static int mmc_sd_alive(struct mmc_host *host) 1027 { 1028 return mmc_send_status(host->card, NULL); 1029 } 1030 1031 /* 1032 * Card detection callback from host. 1033 */ 1034 static void mmc_sd_detect(struct mmc_host *host) 1035 { 1036 int err; 1037 1038 BUG_ON(!host); 1039 BUG_ON(!host->card); 1040 1041 mmc_claim_host(host); 1042 1043 /* 1044 * Just check if our card has been removed. 1045 */ 1046 err = _mmc_detect_card_removed(host); 1047 1048 mmc_release_host(host); 1049 1050 if (err) { 1051 mmc_sd_remove(host); 1052 1053 mmc_claim_host(host); 1054 mmc_detach_bus(host); 1055 mmc_power_off(host); 1056 mmc_release_host(host); 1057 } 1058 } 1059 1060 /* 1061 * Suspend callback from host. 1062 */ 1063 static int mmc_sd_suspend(struct mmc_host *host) 1064 { 1065 int err = 0; 1066 1067 BUG_ON(!host); 1068 BUG_ON(!host->card); 1069 1070 mmc_claim_host(host); 1071 if (!mmc_host_is_spi(host)) 1072 err = mmc_deselect_cards(host); 1073 host->card->state &= ~MMC_STATE_HIGHSPEED; 1074 mmc_release_host(host); 1075 1076 return err; 1077 } 1078 1079 /* 1080 * Resume callback from host. 1081 * 1082 * This function tries to determine if the same card is still present 1083 * and, if so, restore all state to it. 1084 */ 1085 static int mmc_sd_resume(struct mmc_host *host) 1086 { 1087 int err; 1088 1089 BUG_ON(!host); 1090 BUG_ON(!host->card); 1091 1092 mmc_claim_host(host); 1093 err = mmc_sd_init_card(host, host->ocr, host->card); 1094 mmc_release_host(host); 1095 1096 return err; 1097 } 1098 1099 static int mmc_sd_power_restore(struct mmc_host *host) 1100 { 1101 int ret; 1102 1103 host->card->state &= ~MMC_STATE_HIGHSPEED; 1104 mmc_claim_host(host); 1105 ret = mmc_sd_init_card(host, host->ocr, host->card); 1106 mmc_release_host(host); 1107 1108 return ret; 1109 } 1110 1111 static const struct mmc_bus_ops mmc_sd_ops = { 1112 .remove = mmc_sd_remove, 1113 .detect = mmc_sd_detect, 1114 .suspend = NULL, 1115 .resume = NULL, 1116 .power_restore = mmc_sd_power_restore, 1117 .alive = mmc_sd_alive, 1118 }; 1119 1120 static const struct mmc_bus_ops mmc_sd_ops_unsafe = { 1121 .remove = mmc_sd_remove, 1122 .detect = mmc_sd_detect, 1123 .suspend = mmc_sd_suspend, 1124 .resume = mmc_sd_resume, 1125 .power_restore = mmc_sd_power_restore, 1126 .alive = mmc_sd_alive, 1127 }; 1128 1129 static void mmc_sd_attach_bus_ops(struct mmc_host *host) 1130 { 1131 const struct mmc_bus_ops *bus_ops; 1132 1133 if (!mmc_card_is_removable(host)) 1134 bus_ops = &mmc_sd_ops_unsafe; 1135 else 1136 bus_ops = &mmc_sd_ops; 1137 mmc_attach_bus(host, bus_ops); 1138 } 1139 1140 /* 1141 * Starting point for SD card init. 1142 */ 1143 int mmc_attach_sd(struct mmc_host *host) 1144 { 1145 int err; 1146 u32 ocr; 1147 1148 BUG_ON(!host); 1149 WARN_ON(!host->claimed); 1150 1151 /* Disable preset value enable if already set since last time */ 1152 if (host->ops->enable_preset_value) { 1153 mmc_host_clk_hold(host); 1154 host->ops->enable_preset_value(host, false); 1155 mmc_host_clk_release(host); 1156 } 1157 1158 err = mmc_send_app_op_cond(host, 0, &ocr); 1159 if (err) 1160 return err; 1161 1162 mmc_sd_attach_bus_ops(host); 1163 if (host->ocr_avail_sd) 1164 host->ocr_avail = host->ocr_avail_sd; 1165 1166 /* 1167 * We need to get OCR a different way for SPI. 1168 */ 1169 if (mmc_host_is_spi(host)) { 1170 mmc_go_idle(host); 1171 1172 err = mmc_spi_read_ocr(host, 0, &ocr); 1173 if (err) 1174 goto err; 1175 } 1176 1177 /* 1178 * Sanity check the voltages that the card claims to 1179 * support. 1180 */ 1181 if (ocr & 0x7F) { 1182 pr_warning("%s: card claims to support voltages " 1183 "below the defined range. These will be ignored.\n", 1184 mmc_hostname(host)); 1185 ocr &= ~0x7F; 1186 } 1187 1188 if ((ocr & MMC_VDD_165_195) && 1189 !(host->ocr_avail_sd & MMC_VDD_165_195)) { 1190 pr_warning("%s: SD card claims to support the " 1191 "incompletely defined 'low voltage range'. This " 1192 "will be ignored.\n", mmc_hostname(host)); 1193 ocr &= ~MMC_VDD_165_195; 1194 } 1195 1196 host->ocr = mmc_select_voltage(host, ocr); 1197 1198 /* 1199 * Can we support the voltage(s) of the card(s)? 1200 */ 1201 if (!host->ocr) { 1202 err = -EINVAL; 1203 goto err; 1204 } 1205 1206 /* 1207 * Detect and init the card. 1208 */ 1209 err = mmc_sd_init_card(host, host->ocr, NULL); 1210 if (err) 1211 goto err; 1212 1213 mmc_release_host(host); 1214 err = mmc_add_card(host->card); 1215 mmc_claim_host(host); 1216 if (err) 1217 goto remove_card; 1218 1219 return 0; 1220 1221 remove_card: 1222 mmc_release_host(host); 1223 mmc_remove_card(host->card); 1224 host->card = NULL; 1225 mmc_claim_host(host); 1226 err: 1227 mmc_detach_bus(host); 1228 1229 pr_err("%s: error %d whilst initialising SD card\n", 1230 mmc_hostname(host), err); 1231 1232 return err; 1233 } 1234 1235