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/sizes.h> 15 #include <linux/slab.h> 16 #include <linux/stat.h> 17 #include <linux/pm_runtime.h> 18 19 #include <linux/mmc/host.h> 20 #include <linux/mmc/card.h> 21 #include <linux/mmc/mmc.h> 22 #include <linux/mmc/sd.h> 23 24 #include "core.h" 25 #include "bus.h" 26 #include "mmc_ops.h" 27 #include "sd.h" 28 #include "sd_ops.h" 29 30 static const unsigned int tran_exp[] = { 31 10000, 100000, 1000000, 10000000, 32 0, 0, 0, 0 33 }; 34 35 static const unsigned char tran_mant[] = { 36 0, 10, 12, 13, 15, 20, 25, 30, 37 35, 40, 45, 50, 55, 60, 70, 80, 38 }; 39 40 static const unsigned int tacc_exp[] = { 41 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 42 }; 43 44 static const unsigned int tacc_mant[] = { 45 0, 10, 12, 13, 15, 20, 25, 30, 46 35, 40, 45, 50, 55, 60, 70, 80, 47 }; 48 49 static const unsigned int sd_au_size[] = { 50 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512, 51 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512, 52 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512, 53 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512, 54 }; 55 56 #define UNSTUFF_BITS(resp,start,size) \ 57 ({ \ 58 const int __size = size; \ 59 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 60 const int __off = 3 - ((start) / 32); \ 61 const int __shft = (start) & 31; \ 62 u32 __res; \ 63 \ 64 __res = resp[__off] >> __shft; \ 65 if (__size + __shft > 32) \ 66 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 67 __res & __mask; \ 68 }) 69 70 /* 71 * Given the decoded CSD structure, decode the raw CID to our CID structure. 72 */ 73 void mmc_decode_cid(struct mmc_card *card) 74 { 75 u32 *resp = card->raw_cid; 76 77 /* 78 * SD doesn't currently have a version field so we will 79 * have to assume we can parse this. 80 */ 81 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 82 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 83 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 84 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 85 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 86 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 87 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 88 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); 89 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); 90 card->cid.serial = UNSTUFF_BITS(resp, 24, 32); 91 card->cid.year = UNSTUFF_BITS(resp, 12, 8); 92 card->cid.month = UNSTUFF_BITS(resp, 8, 4); 93 94 card->cid.year += 2000; /* SD cards year offset */ 95 } 96 97 /* 98 * Given a 128-bit response, decode to our card CSD structure. 99 */ 100 static int mmc_decode_csd(struct mmc_card *card) 101 { 102 struct mmc_csd *csd = &card->csd; 103 unsigned int e, m, csd_struct; 104 u32 *resp = card->raw_csd; 105 106 csd_struct = UNSTUFF_BITS(resp, 126, 2); 107 108 switch (csd_struct) { 109 case 0: 110 m = UNSTUFF_BITS(resp, 115, 4); 111 e = UNSTUFF_BITS(resp, 112, 3); 112 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 113 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 114 115 m = UNSTUFF_BITS(resp, 99, 4); 116 e = UNSTUFF_BITS(resp, 96, 3); 117 csd->max_dtr = tran_exp[e] * tran_mant[m]; 118 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 119 120 e = UNSTUFF_BITS(resp, 47, 3); 121 m = UNSTUFF_BITS(resp, 62, 12); 122 csd->capacity = (1 + m) << (e + 2); 123 124 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 125 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 126 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 127 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 128 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1); 129 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 130 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 131 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 132 133 if (UNSTUFF_BITS(resp, 46, 1)) { 134 csd->erase_size = 1; 135 } else if (csd->write_blkbits >= 9) { 136 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; 137 csd->erase_size <<= csd->write_blkbits - 9; 138 } 139 break; 140 case 1: 141 /* 142 * This is a block-addressed SDHC or SDXC card. Most 143 * interesting fields are unused and have fixed 144 * values. To avoid getting tripped by buggy cards, 145 * we assume those fixed values ourselves. 146 */ 147 mmc_card_set_blockaddr(card); 148 149 csd->tacc_ns = 0; /* Unused */ 150 csd->tacc_clks = 0; /* Unused */ 151 152 m = UNSTUFF_BITS(resp, 99, 4); 153 e = UNSTUFF_BITS(resp, 96, 3); 154 csd->max_dtr = tran_exp[e] * tran_mant[m]; 155 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 156 csd->c_size = UNSTUFF_BITS(resp, 48, 22); 157 158 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */ 159 if (csd->c_size >= 0xFFFF) 160 mmc_card_set_ext_capacity(card); 161 162 m = UNSTUFF_BITS(resp, 48, 22); 163 csd->capacity = (1 + m) << 10; 164 165 csd->read_blkbits = 9; 166 csd->read_partial = 0; 167 csd->write_misalign = 0; 168 csd->read_misalign = 0; 169 csd->r2w_factor = 4; /* Unused */ 170 csd->write_blkbits = 9; 171 csd->write_partial = 0; 172 csd->erase_size = 1; 173 break; 174 default: 175 pr_err("%s: unrecognised CSD structure version %d\n", 176 mmc_hostname(card->host), csd_struct); 177 return -EINVAL; 178 } 179 180 card->erase_size = csd->erase_size; 181 182 return 0; 183 } 184 185 /* 186 * Given a 64-bit response, decode to our card SCR structure. 187 */ 188 static int mmc_decode_scr(struct mmc_card *card) 189 { 190 struct sd_scr *scr = &card->scr; 191 unsigned int scr_struct; 192 u32 resp[4]; 193 194 resp[3] = card->raw_scr[1]; 195 resp[2] = card->raw_scr[0]; 196 197 scr_struct = UNSTUFF_BITS(resp, 60, 4); 198 if (scr_struct != 0) { 199 pr_err("%s: unrecognised SCR structure version %d\n", 200 mmc_hostname(card->host), scr_struct); 201 return -EINVAL; 202 } 203 204 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 205 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 206 if (scr->sda_vsn == SCR_SPEC_VER_2) 207 /* Check if Physical Layer Spec v3.0 is supported */ 208 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); 209 210 if (UNSTUFF_BITS(resp, 55, 1)) 211 card->erased_byte = 0xFF; 212 else 213 card->erased_byte = 0x0; 214 215 if (scr->sda_spec3) 216 scr->cmds = UNSTUFF_BITS(resp, 32, 2); 217 return 0; 218 } 219 220 /* 221 * Fetch and process SD Status register. 222 */ 223 static int mmc_read_ssr(struct mmc_card *card) 224 { 225 unsigned int au, es, et, eo; 226 int err, i; 227 u32 *ssr; 228 229 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 230 pr_warn("%s: card lacks mandatory SD Status function\n", 231 mmc_hostname(card->host)); 232 return 0; 233 } 234 235 ssr = kmalloc(64, GFP_KERNEL); 236 if (!ssr) 237 return -ENOMEM; 238 239 err = mmc_app_sd_status(card, ssr); 240 if (err) { 241 pr_warn("%s: problem reading SD Status register\n", 242 mmc_hostname(card->host)); 243 err = 0; 244 goto out; 245 } 246 247 for (i = 0; i < 16; i++) 248 ssr[i] = be32_to_cpu(ssr[i]); 249 250 /* 251 * UNSTUFF_BITS only works with four u32s so we have to offset the 252 * bitfield positions accordingly. 253 */ 254 au = UNSTUFF_BITS(ssr, 428 - 384, 4); 255 if (au) { 256 if (au <= 9 || card->scr.sda_spec3) { 257 card->ssr.au = sd_au_size[au]; 258 es = UNSTUFF_BITS(ssr, 408 - 384, 16); 259 et = UNSTUFF_BITS(ssr, 402 - 384, 6); 260 if (es && et) { 261 eo = UNSTUFF_BITS(ssr, 400 - 384, 2); 262 card->ssr.erase_timeout = (et * 1000) / es; 263 card->ssr.erase_offset = eo * 1000; 264 } 265 } else { 266 pr_warn("%s: SD Status: Invalid Allocation Unit size\n", 267 mmc_hostname(card->host)); 268 } 269 } 270 out: 271 kfree(ssr); 272 return err; 273 } 274 275 /* 276 * Fetches and decodes switch information 277 */ 278 static int mmc_read_switch(struct mmc_card *card) 279 { 280 int err; 281 u8 *status; 282 283 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 284 return 0; 285 286 if (!(card->csd.cmdclass & CCC_SWITCH)) { 287 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n", 288 mmc_hostname(card->host)); 289 return 0; 290 } 291 292 err = -EIO; 293 294 status = kmalloc(64, GFP_KERNEL); 295 if (!status) { 296 pr_err("%s: could not allocate a buffer for " 297 "switch capabilities.\n", 298 mmc_hostname(card->host)); 299 return -ENOMEM; 300 } 301 302 /* 303 * Find out the card's support bits with a mode 0 operation. 304 * The argument does not matter, as the support bits do not 305 * change with the arguments. 306 */ 307 err = mmc_sd_switch(card, 0, 0, 0, status); 308 if (err) { 309 /* 310 * If the host or the card can't do the switch, 311 * fail more gracefully. 312 */ 313 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 314 goto out; 315 316 pr_warn("%s: problem reading Bus Speed modes\n", 317 mmc_hostname(card->host)); 318 err = 0; 319 320 goto out; 321 } 322 323 if (status[13] & SD_MODE_HIGH_SPEED) 324 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; 325 326 if (card->scr.sda_spec3) { 327 card->sw_caps.sd3_bus_mode = status[13]; 328 /* Driver Strengths supported by the card */ 329 card->sw_caps.sd3_drv_type = status[9]; 330 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8; 331 } 332 333 out: 334 kfree(status); 335 336 return err; 337 } 338 339 /* 340 * Test if the card supports high-speed mode and, if so, switch to it. 341 */ 342 int mmc_sd_switch_hs(struct mmc_card *card) 343 { 344 int err; 345 u8 *status; 346 347 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 348 return 0; 349 350 if (!(card->csd.cmdclass & CCC_SWITCH)) 351 return 0; 352 353 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 354 return 0; 355 356 if (card->sw_caps.hs_max_dtr == 0) 357 return 0; 358 359 status = kmalloc(64, GFP_KERNEL); 360 if (!status) { 361 pr_err("%s: could not allocate a buffer for " 362 "switch capabilities.\n", mmc_hostname(card->host)); 363 return -ENOMEM; 364 } 365 366 err = mmc_sd_switch(card, 1, 0, 1, status); 367 if (err) 368 goto out; 369 370 if ((status[16] & 0xF) != 1) { 371 pr_warn("%s: Problem switching card into high-speed mode!\n", 372 mmc_hostname(card->host)); 373 err = 0; 374 } else { 375 err = 1; 376 } 377 378 out: 379 kfree(status); 380 381 return err; 382 } 383 384 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 385 { 386 int card_drv_type, drive_strength, drv_type; 387 int err; 388 389 card->drive_strength = 0; 390 391 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; 392 393 drive_strength = mmc_select_drive_strength(card, 394 card->sw_caps.uhs_max_dtr, 395 card_drv_type, &drv_type); 396 397 if (drive_strength) { 398 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 399 if (err) 400 return err; 401 if ((status[15] & 0xF) != drive_strength) { 402 pr_warn("%s: Problem setting drive strength!\n", 403 mmc_hostname(card->host)); 404 return 0; 405 } 406 card->drive_strength = drive_strength; 407 } 408 409 if (drv_type) 410 mmc_set_driver_type(card->host, drv_type); 411 412 return 0; 413 } 414 415 static void sd_update_bus_speed_mode(struct mmc_card *card) 416 { 417 /* 418 * If the host doesn't support any of the UHS-I modes, fallback on 419 * default speed. 420 */ 421 if (!mmc_host_uhs(card->host)) { 422 card->sd_bus_speed = 0; 423 return; 424 } 425 426 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 427 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 428 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 429 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 430 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 431 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 432 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 433 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 434 SD_MODE_UHS_SDR50)) { 435 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 436 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 437 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 438 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 439 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 440 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 441 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 442 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 443 SD_MODE_UHS_SDR12)) { 444 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 445 } 446 } 447 448 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 449 { 450 int err; 451 unsigned int timing = 0; 452 453 switch (card->sd_bus_speed) { 454 case UHS_SDR104_BUS_SPEED: 455 timing = MMC_TIMING_UHS_SDR104; 456 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 457 break; 458 case UHS_DDR50_BUS_SPEED: 459 timing = MMC_TIMING_UHS_DDR50; 460 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 461 break; 462 case UHS_SDR50_BUS_SPEED: 463 timing = MMC_TIMING_UHS_SDR50; 464 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 465 break; 466 case UHS_SDR25_BUS_SPEED: 467 timing = MMC_TIMING_UHS_SDR25; 468 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 469 break; 470 case UHS_SDR12_BUS_SPEED: 471 timing = MMC_TIMING_UHS_SDR12; 472 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 473 break; 474 default: 475 return 0; 476 } 477 478 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 479 if (err) 480 return err; 481 482 if ((status[16] & 0xF) != card->sd_bus_speed) 483 pr_warn("%s: Problem setting bus speed mode!\n", 484 mmc_hostname(card->host)); 485 else { 486 mmc_set_timing(card->host, timing); 487 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 488 } 489 490 return 0; 491 } 492 493 /* Get host's max current setting at its current voltage */ 494 static u32 sd_get_host_max_current(struct mmc_host *host) 495 { 496 u32 voltage, max_current; 497 498 voltage = 1 << host->ios.vdd; 499 switch (voltage) { 500 case MMC_VDD_165_195: 501 max_current = host->max_current_180; 502 break; 503 case MMC_VDD_29_30: 504 case MMC_VDD_30_31: 505 max_current = host->max_current_300; 506 break; 507 case MMC_VDD_32_33: 508 case MMC_VDD_33_34: 509 max_current = host->max_current_330; 510 break; 511 default: 512 max_current = 0; 513 } 514 515 return max_current; 516 } 517 518 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 519 { 520 int current_limit = SD_SET_CURRENT_NO_CHANGE; 521 int err; 522 u32 max_current; 523 524 /* 525 * Current limit switch is only defined for SDR50, SDR104, and DDR50 526 * bus speed modes. For other bus speed modes, we do not change the 527 * current limit. 528 */ 529 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && 530 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && 531 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) 532 return 0; 533 534 /* 535 * Host has different current capabilities when operating at 536 * different voltages, so find out its max current first. 537 */ 538 max_current = sd_get_host_max_current(card->host); 539 540 /* 541 * We only check host's capability here, if we set a limit that is 542 * higher than the card's maximum current, the card will be using its 543 * maximum current, e.g. if the card's maximum current is 300ma, and 544 * when we set current limit to 200ma, the card will draw 200ma, and 545 * when we set current limit to 400/600/800ma, the card will draw its 546 * maximum 300ma from the host. 547 * 548 * The above is incorrect: if we try to set a current limit that is 549 * not supported by the card, the card can rightfully error out the 550 * attempt, and remain at the default current limit. This results 551 * in a 300mA card being limited to 200mA even though the host 552 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with 553 * an iMX6 host. --rmk 554 */ 555 if (max_current >= 800 && 556 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) 557 current_limit = SD_SET_CURRENT_LIMIT_800; 558 else if (max_current >= 600 && 559 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) 560 current_limit = SD_SET_CURRENT_LIMIT_600; 561 else if (max_current >= 400 && 562 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) 563 current_limit = SD_SET_CURRENT_LIMIT_400; 564 else if (max_current >= 200 && 565 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) 566 current_limit = SD_SET_CURRENT_LIMIT_200; 567 568 if (current_limit != SD_SET_CURRENT_NO_CHANGE) { 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 pr_warn("%s: Problem setting current limit!\n", 575 mmc_hostname(card->host)); 576 577 } 578 579 return 0; 580 } 581 582 /* 583 * UHS-I specific initialization procedure 584 */ 585 static int mmc_sd_init_uhs_card(struct mmc_card *card) 586 { 587 int err; 588 u8 *status; 589 590 if (!card->scr.sda_spec3) 591 return 0; 592 593 if (!(card->csd.cmdclass & CCC_SWITCH)) 594 return 0; 595 596 status = kmalloc(64, GFP_KERNEL); 597 if (!status) { 598 pr_err("%s: could not allocate a buffer for " 599 "switch capabilities.\n", mmc_hostname(card->host)); 600 return -ENOMEM; 601 } 602 603 /* Set 4-bit bus width */ 604 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 605 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 606 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 607 if (err) 608 goto out; 609 610 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 611 } 612 613 /* 614 * Select the bus speed mode depending on host 615 * and card capability. 616 */ 617 sd_update_bus_speed_mode(card); 618 619 /* Set the driver strength for the card */ 620 err = sd_select_driver_type(card, status); 621 if (err) 622 goto out; 623 624 /* Set current limit for the card */ 625 err = sd_set_current_limit(card, status); 626 if (err) 627 goto out; 628 629 /* Set bus speed mode of the card */ 630 err = sd_set_bus_speed_mode(card, status); 631 if (err) 632 goto out; 633 634 /* 635 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 636 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 637 */ 638 if (!mmc_host_is_spi(card->host) && 639 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 || 640 card->host->ios.timing == MMC_TIMING_UHS_DDR50 || 641 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) { 642 err = mmc_execute_tuning(card); 643 644 /* 645 * As SD Specifications Part1 Physical Layer Specification 646 * Version 3.01 says, CMD19 tuning is available for unlocked 647 * cards in transfer state of 1.8V signaling mode. The small 648 * difference between v3.00 and 3.01 spec means that CMD19 649 * tuning is also available for DDR50 mode. 650 */ 651 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) { 652 pr_warn("%s: ddr50 tuning failed\n", 653 mmc_hostname(card->host)); 654 err = 0; 655 } 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 MMC_DEV_ATTR(ocr, "%08x\n", card->ocr); 679 680 681 static ssize_t mmc_dsr_show(struct device *dev, 682 struct device_attribute *attr, 683 char *buf) 684 { 685 struct mmc_card *card = mmc_dev_to_card(dev); 686 struct mmc_host *host = card->host; 687 688 if (card->csd.dsr_imp && host->dsr_req) 689 return sprintf(buf, "0x%x\n", host->dsr); 690 else 691 /* return default DSR value */ 692 return sprintf(buf, "0x%x\n", 0x404); 693 } 694 695 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL); 696 697 static struct attribute *sd_std_attrs[] = { 698 &dev_attr_cid.attr, 699 &dev_attr_csd.attr, 700 &dev_attr_scr.attr, 701 &dev_attr_date.attr, 702 &dev_attr_erase_size.attr, 703 &dev_attr_preferred_erase_size.attr, 704 &dev_attr_fwrev.attr, 705 &dev_attr_hwrev.attr, 706 &dev_attr_manfid.attr, 707 &dev_attr_name.attr, 708 &dev_attr_oemid.attr, 709 &dev_attr_serial.attr, 710 &dev_attr_ocr.attr, 711 &dev_attr_dsr.attr, 712 NULL, 713 }; 714 ATTRIBUTE_GROUPS(sd_std); 715 716 struct device_type sd_type = { 717 .groups = sd_std_groups, 718 }; 719 720 /* 721 * Fetch CID from card. 722 */ 723 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 724 { 725 int err; 726 u32 max_current; 727 int retries = 10; 728 u32 pocr = ocr; 729 730 try_again: 731 if (!retries) { 732 ocr &= ~SD_OCR_S18R; 733 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 734 } 735 736 /* 737 * Since we're changing the OCR value, we seem to 738 * need to tell some cards to go back to the idle 739 * state. We wait 1ms to give cards time to 740 * respond. 741 */ 742 mmc_go_idle(host); 743 744 /* 745 * If SD_SEND_IF_COND indicates an SD 2.0 746 * compliant card and we should set bit 30 747 * of the ocr to indicate that we can handle 748 * block-addressed SDHC cards. 749 */ 750 err = mmc_send_if_cond(host, ocr); 751 if (!err) 752 ocr |= SD_OCR_CCS; 753 754 /* 755 * If the host supports one of UHS-I modes, request the card 756 * to switch to 1.8V signaling level. If the card has failed 757 * repeatedly to switch however, skip this. 758 */ 759 if (retries && mmc_host_uhs(host)) 760 ocr |= SD_OCR_S18R; 761 762 /* 763 * If the host can supply more than 150mA at current voltage, 764 * XPC should be set to 1. 765 */ 766 max_current = sd_get_host_max_current(host); 767 if (max_current > 150) 768 ocr |= SD_OCR_XPC; 769 770 err = mmc_send_app_op_cond(host, ocr, rocr); 771 if (err) 772 return err; 773 774 /* 775 * In case CCS and S18A in the response is set, start Signal Voltage 776 * Switch procedure. SPI mode doesn't support CMD11. 777 */ 778 if (!mmc_host_is_spi(host) && rocr && 779 ((*rocr & 0x41000000) == 0x41000000)) { 780 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 781 pocr); 782 if (err == -EAGAIN) { 783 retries--; 784 goto try_again; 785 } else if (err) { 786 retries = 0; 787 goto try_again; 788 } 789 } 790 791 if (mmc_host_is_spi(host)) 792 err = mmc_send_cid(host, cid); 793 else 794 err = mmc_all_send_cid(host, cid); 795 796 return err; 797 } 798 799 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 800 { 801 int err; 802 803 /* 804 * Fetch CSD from card. 805 */ 806 err = mmc_send_csd(card, card->raw_csd); 807 if (err) 808 return err; 809 810 err = mmc_decode_csd(card); 811 if (err) 812 return err; 813 814 return 0; 815 } 816 817 static int mmc_sd_get_ro(struct mmc_host *host) 818 { 819 int ro; 820 821 /* 822 * Some systems don't feature a write-protect pin and don't need one. 823 * E.g. because they only have micro-SD card slot. For those systems 824 * assume that the SD card is always read-write. 825 */ 826 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT) 827 return 0; 828 829 if (!host->ops->get_ro) 830 return -1; 831 832 ro = host->ops->get_ro(host); 833 834 return ro; 835 } 836 837 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 838 bool reinit) 839 { 840 int err; 841 842 if (!reinit) { 843 /* 844 * Fetch SCR from card. 845 */ 846 err = mmc_app_send_scr(card, card->raw_scr); 847 if (err) 848 return err; 849 850 err = mmc_decode_scr(card); 851 if (err) 852 return err; 853 854 /* 855 * Fetch and process SD Status register. 856 */ 857 err = mmc_read_ssr(card); 858 if (err) 859 return err; 860 861 /* Erase init depends on CSD and SSR */ 862 mmc_init_erase(card); 863 864 /* 865 * Fetch switch information from card. 866 */ 867 err = mmc_read_switch(card); 868 if (err) 869 return err; 870 } 871 872 /* 873 * For SPI, enable CRC as appropriate. 874 * This CRC enable is located AFTER the reading of the 875 * card registers because some SDHC cards are not able 876 * to provide valid CRCs for non-512-byte blocks. 877 */ 878 if (mmc_host_is_spi(host)) { 879 err = mmc_spi_set_crc(host, use_spi_crc); 880 if (err) 881 return err; 882 } 883 884 /* 885 * Check if read-only switch is active. 886 */ 887 if (!reinit) { 888 int ro = mmc_sd_get_ro(host); 889 890 if (ro < 0) { 891 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n", 892 mmc_hostname(host)); 893 } else if (ro > 0) { 894 mmc_card_set_readonly(card); 895 } 896 } 897 898 return 0; 899 } 900 901 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 902 { 903 unsigned max_dtr = (unsigned int)-1; 904 905 if (mmc_card_hs(card)) { 906 if (max_dtr > card->sw_caps.hs_max_dtr) 907 max_dtr = card->sw_caps.hs_max_dtr; 908 } else if (max_dtr > card->csd.max_dtr) { 909 max_dtr = card->csd.max_dtr; 910 } 911 912 return max_dtr; 913 } 914 915 /* 916 * Handle the detection and initialisation of a card. 917 * 918 * In the case of a resume, "oldcard" will contain the card 919 * we're trying to reinitialise. 920 */ 921 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 922 struct mmc_card *oldcard) 923 { 924 struct mmc_card *card; 925 int err; 926 u32 cid[4]; 927 u32 rocr = 0; 928 929 BUG_ON(!host); 930 WARN_ON(!host->claimed); 931 932 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 933 if (err) 934 return err; 935 936 if (oldcard) { 937 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 938 return -ENOENT; 939 940 card = oldcard; 941 } else { 942 /* 943 * Allocate card structure. 944 */ 945 card = mmc_alloc_card(host, &sd_type); 946 if (IS_ERR(card)) 947 return PTR_ERR(card); 948 949 card->ocr = ocr; 950 card->type = MMC_TYPE_SD; 951 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 952 } 953 954 /* 955 * Call the optional HC's init_card function to handle quirks. 956 */ 957 if (host->ops->init_card) 958 host->ops->init_card(host, card); 959 960 /* 961 * For native busses: get card RCA and quit open drain mode. 962 */ 963 if (!mmc_host_is_spi(host)) { 964 err = mmc_send_relative_addr(host, &card->rca); 965 if (err) 966 goto free_card; 967 } 968 969 if (!oldcard) { 970 err = mmc_sd_get_csd(host, card); 971 if (err) 972 goto free_card; 973 974 mmc_decode_cid(card); 975 } 976 977 /* 978 * handling only for cards supporting DSR and hosts requesting 979 * DSR configuration 980 */ 981 if (card->csd.dsr_imp && host->dsr_req) 982 mmc_set_dsr(host); 983 984 /* 985 * Select card, as all following commands rely on that. 986 */ 987 if (!mmc_host_is_spi(host)) { 988 err = mmc_select_card(card); 989 if (err) 990 goto free_card; 991 } 992 993 err = mmc_sd_setup_card(host, card, oldcard != NULL); 994 if (err) 995 goto free_card; 996 997 /* Initialization sequence for UHS-I cards */ 998 if (rocr & SD_ROCR_S18A) { 999 err = mmc_sd_init_uhs_card(card); 1000 if (err) 1001 goto free_card; 1002 } else { 1003 /* 1004 * Attempt to change to high-speed (if supported) 1005 */ 1006 err = mmc_sd_switch_hs(card); 1007 if (err > 0) 1008 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 1009 else if (err) 1010 goto free_card; 1011 1012 /* 1013 * Set bus speed. 1014 */ 1015 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 1016 1017 /* 1018 * Switch to wider bus (if supported). 1019 */ 1020 if ((host->caps & MMC_CAP_4_BIT_DATA) && 1021 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 1022 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 1023 if (err) 1024 goto free_card; 1025 1026 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1027 } 1028 } 1029 1030 host->card = card; 1031 return 0; 1032 1033 free_card: 1034 if (!oldcard) 1035 mmc_remove_card(card); 1036 1037 return err; 1038 } 1039 1040 /* 1041 * Host is being removed. Free up the current card. 1042 */ 1043 static void mmc_sd_remove(struct mmc_host *host) 1044 { 1045 BUG_ON(!host); 1046 BUG_ON(!host->card); 1047 1048 mmc_remove_card(host->card); 1049 host->card = NULL; 1050 } 1051 1052 /* 1053 * Card detection - card is alive. 1054 */ 1055 static int mmc_sd_alive(struct mmc_host *host) 1056 { 1057 return mmc_send_status(host->card, NULL); 1058 } 1059 1060 /* 1061 * Card detection callback from host. 1062 */ 1063 static void mmc_sd_detect(struct mmc_host *host) 1064 { 1065 int err; 1066 1067 BUG_ON(!host); 1068 BUG_ON(!host->card); 1069 1070 mmc_get_card(host->card); 1071 1072 /* 1073 * Just check if our card has been removed. 1074 */ 1075 err = _mmc_detect_card_removed(host); 1076 1077 mmc_put_card(host->card); 1078 1079 if (err) { 1080 mmc_sd_remove(host); 1081 1082 mmc_claim_host(host); 1083 mmc_detach_bus(host); 1084 mmc_power_off(host); 1085 mmc_release_host(host); 1086 } 1087 } 1088 1089 static int _mmc_sd_suspend(struct mmc_host *host) 1090 { 1091 int err = 0; 1092 1093 BUG_ON(!host); 1094 BUG_ON(!host->card); 1095 1096 mmc_claim_host(host); 1097 1098 if (mmc_card_suspended(host->card)) 1099 goto out; 1100 1101 if (!mmc_host_is_spi(host)) 1102 err = mmc_deselect_cards(host); 1103 1104 if (!err) { 1105 mmc_power_off(host); 1106 mmc_card_set_suspended(host->card); 1107 } 1108 1109 out: 1110 mmc_release_host(host); 1111 return err; 1112 } 1113 1114 /* 1115 * Callback for suspend 1116 */ 1117 static int mmc_sd_suspend(struct mmc_host *host) 1118 { 1119 int err; 1120 1121 err = _mmc_sd_suspend(host); 1122 if (!err) { 1123 pm_runtime_disable(&host->card->dev); 1124 pm_runtime_set_suspended(&host->card->dev); 1125 } 1126 1127 return err; 1128 } 1129 1130 /* 1131 * This function tries to determine if the same card is still present 1132 * and, if so, restore all state to it. 1133 */ 1134 static int _mmc_sd_resume(struct mmc_host *host) 1135 { 1136 int err = 0; 1137 1138 BUG_ON(!host); 1139 BUG_ON(!host->card); 1140 1141 mmc_claim_host(host); 1142 1143 if (!mmc_card_suspended(host->card)) 1144 goto out; 1145 1146 mmc_power_up(host, host->card->ocr); 1147 err = mmc_sd_init_card(host, host->card->ocr, host->card); 1148 mmc_card_clr_suspended(host->card); 1149 1150 out: 1151 mmc_release_host(host); 1152 return err; 1153 } 1154 1155 /* 1156 * Callback for resume 1157 */ 1158 static int mmc_sd_resume(struct mmc_host *host) 1159 { 1160 pm_runtime_enable(&host->card->dev); 1161 return 0; 1162 } 1163 1164 /* 1165 * Callback for runtime_suspend. 1166 */ 1167 static int mmc_sd_runtime_suspend(struct mmc_host *host) 1168 { 1169 int err; 1170 1171 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) 1172 return 0; 1173 1174 err = _mmc_sd_suspend(host); 1175 if (err) 1176 pr_err("%s: error %d doing aggressive suspend\n", 1177 mmc_hostname(host), err); 1178 1179 return err; 1180 } 1181 1182 /* 1183 * Callback for runtime_resume. 1184 */ 1185 static int mmc_sd_runtime_resume(struct mmc_host *host) 1186 { 1187 int err; 1188 1189 err = _mmc_sd_resume(host); 1190 if (err && err != -ENOMEDIUM) 1191 pr_err("%s: error %d doing runtime resume\n", 1192 mmc_hostname(host), err); 1193 1194 return 0; 1195 } 1196 1197 static int mmc_sd_reset(struct mmc_host *host) 1198 { 1199 mmc_power_cycle(host, host->card->ocr); 1200 return mmc_sd_init_card(host, host->card->ocr, host->card); 1201 } 1202 1203 static const struct mmc_bus_ops mmc_sd_ops = { 1204 .remove = mmc_sd_remove, 1205 .detect = mmc_sd_detect, 1206 .runtime_suspend = mmc_sd_runtime_suspend, 1207 .runtime_resume = mmc_sd_runtime_resume, 1208 .suspend = mmc_sd_suspend, 1209 .resume = mmc_sd_resume, 1210 .alive = mmc_sd_alive, 1211 .shutdown = mmc_sd_suspend, 1212 .reset = mmc_sd_reset, 1213 }; 1214 1215 /* 1216 * Starting point for SD card init. 1217 */ 1218 int mmc_attach_sd(struct mmc_host *host) 1219 { 1220 int err; 1221 u32 ocr, rocr; 1222 1223 BUG_ON(!host); 1224 WARN_ON(!host->claimed); 1225 1226 err = mmc_send_app_op_cond(host, 0, &ocr); 1227 if (err) 1228 return err; 1229 1230 mmc_attach_bus(host, &mmc_sd_ops); 1231 if (host->ocr_avail_sd) 1232 host->ocr_avail = host->ocr_avail_sd; 1233 1234 /* 1235 * We need to get OCR a different way for SPI. 1236 */ 1237 if (mmc_host_is_spi(host)) { 1238 mmc_go_idle(host); 1239 1240 err = mmc_spi_read_ocr(host, 0, &ocr); 1241 if (err) 1242 goto err; 1243 } 1244 1245 rocr = mmc_select_voltage(host, ocr); 1246 1247 /* 1248 * Can we support the voltage(s) of the card(s)? 1249 */ 1250 if (!rocr) { 1251 err = -EINVAL; 1252 goto err; 1253 } 1254 1255 /* 1256 * Detect and init the card. 1257 */ 1258 err = mmc_sd_init_card(host, rocr, NULL); 1259 if (err) 1260 goto err; 1261 1262 mmc_release_host(host); 1263 err = mmc_add_card(host->card); 1264 if (err) 1265 goto remove_card; 1266 1267 mmc_claim_host(host); 1268 return 0; 1269 1270 remove_card: 1271 mmc_remove_card(host->card); 1272 host->card = NULL; 1273 mmc_claim_host(host); 1274 err: 1275 mmc_detach_bus(host); 1276 1277 pr_err("%s: error %d whilst initialising SD card\n", 1278 mmc_hostname(host), err); 1279 1280 return err; 1281 } 1282