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 "card.h" 26 #include "host.h" 27 #include "bus.h" 28 #include "mmc_ops.h" 29 #include "sd.h" 30 #include "sd_ops.h" 31 32 static const unsigned int tran_exp[] = { 33 10000, 100000, 1000000, 10000000, 34 0, 0, 0, 0 35 }; 36 37 static const unsigned char tran_mant[] = { 38 0, 10, 12, 13, 15, 20, 25, 30, 39 35, 40, 45, 50, 55, 60, 70, 80, 40 }; 41 42 static const unsigned int taac_exp[] = { 43 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 44 }; 45 46 static const unsigned int taac_mant[] = { 47 0, 10, 12, 13, 15, 20, 25, 30, 48 35, 40, 45, 50, 55, 60, 70, 80, 49 }; 50 51 static const unsigned int sd_au_size[] = { 52 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512, 53 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512, 54 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512, 55 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512, 56 }; 57 58 #define UNSTUFF_BITS(resp,start,size) \ 59 ({ \ 60 const int __size = size; \ 61 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 62 const int __off = 3 - ((start) / 32); \ 63 const int __shft = (start) & 31; \ 64 u32 __res; \ 65 \ 66 __res = resp[__off] >> __shft; \ 67 if (__size + __shft > 32) \ 68 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 69 __res & __mask; \ 70 }) 71 72 /* 73 * Given the decoded CSD structure, decode the raw CID to our CID structure. 74 */ 75 void mmc_decode_cid(struct mmc_card *card) 76 { 77 u32 *resp = card->raw_cid; 78 79 /* 80 * SD doesn't currently have a version field so we will 81 * have to assume we can parse this. 82 */ 83 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 84 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 85 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 86 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 87 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 88 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 89 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 90 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); 91 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); 92 card->cid.serial = UNSTUFF_BITS(resp, 24, 32); 93 card->cid.year = UNSTUFF_BITS(resp, 12, 8); 94 card->cid.month = UNSTUFF_BITS(resp, 8, 4); 95 96 card->cid.year += 2000; /* SD cards year offset */ 97 } 98 99 /* 100 * Given a 128-bit response, decode to our card CSD structure. 101 */ 102 static int mmc_decode_csd(struct mmc_card *card) 103 { 104 struct mmc_csd *csd = &card->csd; 105 unsigned int e, m, csd_struct; 106 u32 *resp = card->raw_csd; 107 108 csd_struct = UNSTUFF_BITS(resp, 126, 2); 109 110 switch (csd_struct) { 111 case 0: 112 m = UNSTUFF_BITS(resp, 115, 4); 113 e = UNSTUFF_BITS(resp, 112, 3); 114 csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10; 115 csd->taac_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 116 117 m = UNSTUFF_BITS(resp, 99, 4); 118 e = UNSTUFF_BITS(resp, 96, 3); 119 csd->max_dtr = tran_exp[e] * tran_mant[m]; 120 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 121 122 e = UNSTUFF_BITS(resp, 47, 3); 123 m = UNSTUFF_BITS(resp, 62, 12); 124 csd->capacity = (1 + m) << (e + 2); 125 126 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 127 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 128 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 129 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 130 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1); 131 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 132 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 133 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 134 135 if (UNSTUFF_BITS(resp, 46, 1)) { 136 csd->erase_size = 1; 137 } else if (csd->write_blkbits >= 9) { 138 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; 139 csd->erase_size <<= csd->write_blkbits - 9; 140 } 141 break; 142 case 1: 143 /* 144 * This is a block-addressed SDHC or SDXC card. Most 145 * interesting fields are unused and have fixed 146 * values. To avoid getting tripped by buggy cards, 147 * we assume those fixed values ourselves. 148 */ 149 mmc_card_set_blockaddr(card); 150 151 csd->taac_ns = 0; /* Unused */ 152 csd->taac_clks = 0; /* Unused */ 153 154 m = UNSTUFF_BITS(resp, 99, 4); 155 e = UNSTUFF_BITS(resp, 96, 3); 156 csd->max_dtr = tran_exp[e] * tran_mant[m]; 157 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 158 csd->c_size = UNSTUFF_BITS(resp, 48, 22); 159 160 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */ 161 if (csd->c_size >= 0xFFFF) 162 mmc_card_set_ext_capacity(card); 163 164 m = UNSTUFF_BITS(resp, 48, 22); 165 csd->capacity = (1 + m) << 10; 166 167 csd->read_blkbits = 9; 168 csd->read_partial = 0; 169 csd->write_misalign = 0; 170 csd->read_misalign = 0; 171 csd->r2w_factor = 4; /* Unused */ 172 csd->write_blkbits = 9; 173 csd->write_partial = 0; 174 csd->erase_size = 1; 175 break; 176 default: 177 pr_err("%s: unrecognised CSD structure version %d\n", 178 mmc_hostname(card->host), csd_struct); 179 return -EINVAL; 180 } 181 182 card->erase_size = csd->erase_size; 183 184 return 0; 185 } 186 187 /* 188 * Given a 64-bit response, decode to our card SCR structure. 189 */ 190 static int mmc_decode_scr(struct mmc_card *card) 191 { 192 struct sd_scr *scr = &card->scr; 193 unsigned int scr_struct; 194 u32 resp[4]; 195 196 resp[3] = card->raw_scr[1]; 197 resp[2] = card->raw_scr[0]; 198 199 scr_struct = UNSTUFF_BITS(resp, 60, 4); 200 if (scr_struct != 0) { 201 pr_err("%s: unrecognised SCR structure version %d\n", 202 mmc_hostname(card->host), scr_struct); 203 return -EINVAL; 204 } 205 206 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 207 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 208 if (scr->sda_vsn == SCR_SPEC_VER_2) 209 /* Check if Physical Layer Spec v3.0 is supported */ 210 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); 211 212 if (scr->sda_spec3) { 213 scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1); 214 scr->sda_specx = UNSTUFF_BITS(resp, 38, 4); 215 } 216 217 if (UNSTUFF_BITS(resp, 55, 1)) 218 card->erased_byte = 0xFF; 219 else 220 card->erased_byte = 0x0; 221 222 if (scr->sda_spec3) 223 scr->cmds = UNSTUFF_BITS(resp, 32, 2); 224 225 /* SD Spec says: any SD Card shall set at least bits 0 and 2 */ 226 if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) || 227 !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) { 228 pr_err("%s: invalid bus width\n", mmc_hostname(card->host)); 229 return -EINVAL; 230 } 231 232 return 0; 233 } 234 235 /* 236 * Fetch and process SD Status register. 237 */ 238 static int mmc_read_ssr(struct mmc_card *card) 239 { 240 unsigned int au, es, et, eo; 241 __be32 *raw_ssr; 242 u32 resp[4] = {}; 243 u8 discard_support; 244 int i; 245 246 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 247 pr_warn("%s: card lacks mandatory SD Status function\n", 248 mmc_hostname(card->host)); 249 return 0; 250 } 251 252 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL); 253 if (!raw_ssr) 254 return -ENOMEM; 255 256 if (mmc_app_sd_status(card, raw_ssr)) { 257 pr_warn("%s: problem reading SD Status register\n", 258 mmc_hostname(card->host)); 259 kfree(raw_ssr); 260 return 0; 261 } 262 263 for (i = 0; i < 16; i++) 264 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]); 265 266 kfree(raw_ssr); 267 268 /* 269 * UNSTUFF_BITS only works with four u32s so we have to offset the 270 * bitfield positions accordingly. 271 */ 272 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4); 273 if (au) { 274 if (au <= 9 || card->scr.sda_spec3) { 275 card->ssr.au = sd_au_size[au]; 276 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16); 277 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6); 278 if (es && et) { 279 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2); 280 card->ssr.erase_timeout = (et * 1000) / es; 281 card->ssr.erase_offset = eo * 1000; 282 } 283 } else { 284 pr_warn("%s: SD Status: Invalid Allocation Unit size\n", 285 mmc_hostname(card->host)); 286 } 287 } 288 289 /* 290 * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set 291 */ 292 resp[3] = card->raw_ssr[6]; 293 discard_support = UNSTUFF_BITS(resp, 313 - 288, 1); 294 card->erase_arg = (card->scr.sda_specx && discard_support) ? 295 SD_DISCARD_ARG : SD_ERASE_ARG; 296 297 return 0; 298 } 299 300 /* 301 * Fetches and decodes switch information 302 */ 303 static int mmc_read_switch(struct mmc_card *card) 304 { 305 int err; 306 u8 *status; 307 308 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 309 return 0; 310 311 if (!(card->csd.cmdclass & CCC_SWITCH)) { 312 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n", 313 mmc_hostname(card->host)); 314 return 0; 315 } 316 317 status = kmalloc(64, GFP_KERNEL); 318 if (!status) 319 return -ENOMEM; 320 321 /* 322 * Find out the card's support bits with a mode 0 operation. 323 * The argument does not matter, as the support bits do not 324 * change with the arguments. 325 */ 326 err = mmc_sd_switch(card, 0, 0, 0, status); 327 if (err) { 328 /* 329 * If the host or the card can't do the switch, 330 * fail more gracefully. 331 */ 332 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 333 goto out; 334 335 pr_warn("%s: problem reading Bus Speed modes\n", 336 mmc_hostname(card->host)); 337 err = 0; 338 339 goto out; 340 } 341 342 if (status[13] & SD_MODE_HIGH_SPEED) 343 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; 344 345 if (card->scr.sda_spec3) { 346 card->sw_caps.sd3_bus_mode = status[13]; 347 /* Driver Strengths supported by the card */ 348 card->sw_caps.sd3_drv_type = status[9]; 349 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8; 350 } 351 352 out: 353 kfree(status); 354 355 return err; 356 } 357 358 /* 359 * Test if the card supports high-speed mode and, if so, switch to it. 360 */ 361 int mmc_sd_switch_hs(struct mmc_card *card) 362 { 363 int err; 364 u8 *status; 365 366 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 367 return 0; 368 369 if (!(card->csd.cmdclass & CCC_SWITCH)) 370 return 0; 371 372 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 373 return 0; 374 375 if (card->sw_caps.hs_max_dtr == 0) 376 return 0; 377 378 status = kmalloc(64, GFP_KERNEL); 379 if (!status) 380 return -ENOMEM; 381 382 err = mmc_sd_switch(card, 1, 0, 1, status); 383 if (err) 384 goto out; 385 386 if ((status[16] & 0xF) != 1) { 387 pr_warn("%s: Problem switching card into high-speed mode!\n", 388 mmc_hostname(card->host)); 389 err = 0; 390 } else { 391 err = 1; 392 } 393 394 out: 395 kfree(status); 396 397 return err; 398 } 399 400 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 401 { 402 int card_drv_type, drive_strength, drv_type; 403 int err; 404 405 card->drive_strength = 0; 406 407 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; 408 409 drive_strength = mmc_select_drive_strength(card, 410 card->sw_caps.uhs_max_dtr, 411 card_drv_type, &drv_type); 412 413 if (drive_strength) { 414 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 415 if (err) 416 return err; 417 if ((status[15] & 0xF) != drive_strength) { 418 pr_warn("%s: Problem setting drive strength!\n", 419 mmc_hostname(card->host)); 420 return 0; 421 } 422 card->drive_strength = drive_strength; 423 } 424 425 if (drv_type) 426 mmc_set_driver_type(card->host, drv_type); 427 428 return 0; 429 } 430 431 static void sd_update_bus_speed_mode(struct mmc_card *card) 432 { 433 /* 434 * If the host doesn't support any of the UHS-I modes, fallback on 435 * default speed. 436 */ 437 if (!mmc_host_uhs(card->host)) { 438 card->sd_bus_speed = 0; 439 return; 440 } 441 442 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 443 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 444 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 445 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 446 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 447 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 448 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 449 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 450 SD_MODE_UHS_SDR50)) { 451 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 452 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 453 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 454 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 455 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 456 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 457 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 458 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 459 SD_MODE_UHS_SDR12)) { 460 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 461 } 462 } 463 464 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 465 { 466 int err; 467 unsigned int timing = 0; 468 469 switch (card->sd_bus_speed) { 470 case UHS_SDR104_BUS_SPEED: 471 timing = MMC_TIMING_UHS_SDR104; 472 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 473 break; 474 case UHS_DDR50_BUS_SPEED: 475 timing = MMC_TIMING_UHS_DDR50; 476 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 477 break; 478 case UHS_SDR50_BUS_SPEED: 479 timing = MMC_TIMING_UHS_SDR50; 480 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 481 break; 482 case UHS_SDR25_BUS_SPEED: 483 timing = MMC_TIMING_UHS_SDR25; 484 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 485 break; 486 case UHS_SDR12_BUS_SPEED: 487 timing = MMC_TIMING_UHS_SDR12; 488 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 489 break; 490 default: 491 return 0; 492 } 493 494 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 495 if (err) 496 return err; 497 498 if ((status[16] & 0xF) != card->sd_bus_speed) 499 pr_warn("%s: Problem setting bus speed mode!\n", 500 mmc_hostname(card->host)); 501 else { 502 mmc_set_timing(card->host, timing); 503 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 504 } 505 506 return 0; 507 } 508 509 /* Get host's max current setting at its current voltage */ 510 static u32 sd_get_host_max_current(struct mmc_host *host) 511 { 512 u32 voltage, max_current; 513 514 voltage = 1 << host->ios.vdd; 515 switch (voltage) { 516 case MMC_VDD_165_195: 517 max_current = host->max_current_180; 518 break; 519 case MMC_VDD_29_30: 520 case MMC_VDD_30_31: 521 max_current = host->max_current_300; 522 break; 523 case MMC_VDD_32_33: 524 case MMC_VDD_33_34: 525 max_current = host->max_current_330; 526 break; 527 default: 528 max_current = 0; 529 } 530 531 return max_current; 532 } 533 534 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 535 { 536 int current_limit = SD_SET_CURRENT_NO_CHANGE; 537 int err; 538 u32 max_current; 539 540 /* 541 * Current limit switch is only defined for SDR50, SDR104, and DDR50 542 * bus speed modes. For other bus speed modes, we do not change the 543 * current limit. 544 */ 545 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && 546 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && 547 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) 548 return 0; 549 550 /* 551 * Host has different current capabilities when operating at 552 * different voltages, so find out its max current first. 553 */ 554 max_current = sd_get_host_max_current(card->host); 555 556 /* 557 * We only check host's capability here, if we set a limit that is 558 * higher than the card's maximum current, the card will be using its 559 * maximum current, e.g. if the card's maximum current is 300ma, and 560 * when we set current limit to 200ma, the card will draw 200ma, and 561 * when we set current limit to 400/600/800ma, the card will draw its 562 * maximum 300ma from the host. 563 * 564 * The above is incorrect: if we try to set a current limit that is 565 * not supported by the card, the card can rightfully error out the 566 * attempt, and remain at the default current limit. This results 567 * in a 300mA card being limited to 200mA even though the host 568 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with 569 * an iMX6 host. --rmk 570 */ 571 if (max_current >= 800 && 572 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) 573 current_limit = SD_SET_CURRENT_LIMIT_800; 574 else if (max_current >= 600 && 575 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) 576 current_limit = SD_SET_CURRENT_LIMIT_600; 577 else if (max_current >= 400 && 578 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) 579 current_limit = SD_SET_CURRENT_LIMIT_400; 580 else if (max_current >= 200 && 581 card->sw_caps.sd3_curr_limit & SD_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_warn("%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->csd.cmdclass & CCC_SWITCH)) 607 return 0; 608 609 status = kmalloc(64, GFP_KERNEL); 610 if (!status) 611 return -ENOMEM; 612 613 /* Set 4-bit bus width */ 614 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 615 if (err) 616 goto out; 617 618 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 619 620 /* 621 * Select the bus speed mode depending on host 622 * and card capability. 623 */ 624 sd_update_bus_speed_mode(card); 625 626 /* Set the driver strength for the card */ 627 err = sd_select_driver_type(card, status); 628 if (err) 629 goto out; 630 631 /* Set current limit for the card */ 632 err = sd_set_current_limit(card, status); 633 if (err) 634 goto out; 635 636 /* Set bus speed mode of the card */ 637 err = sd_set_bus_speed_mode(card, status); 638 if (err) 639 goto out; 640 641 /* 642 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 643 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 644 */ 645 if (!mmc_host_is_spi(card->host) && 646 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 || 647 card->host->ios.timing == MMC_TIMING_UHS_DDR50 || 648 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) { 649 err = mmc_execute_tuning(card); 650 651 /* 652 * As SD Specifications Part1 Physical Layer Specification 653 * Version 3.01 says, CMD19 tuning is available for unlocked 654 * cards in transfer state of 1.8V signaling mode. The small 655 * difference between v3.00 and 3.01 spec means that CMD19 656 * tuning is also available for DDR50 mode. 657 */ 658 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) { 659 pr_warn("%s: ddr50 tuning failed\n", 660 mmc_hostname(card->host)); 661 err = 0; 662 } 663 } 664 665 out: 666 kfree(status); 667 668 return err; 669 } 670 671 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 672 card->raw_cid[2], card->raw_cid[3]); 673 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 674 card->raw_csd[2], card->raw_csd[3]); 675 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 676 MMC_DEV_ATTR(ssr, 677 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n", 678 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2], 679 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5], 680 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8], 681 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11], 682 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14], 683 card->raw_ssr[15]); 684 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 685 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 686 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 687 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 688 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 689 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 690 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 691 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 692 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 693 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr); 694 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca); 695 696 697 static ssize_t mmc_dsr_show(struct device *dev, 698 struct device_attribute *attr, 699 char *buf) 700 { 701 struct mmc_card *card = mmc_dev_to_card(dev); 702 struct mmc_host *host = card->host; 703 704 if (card->csd.dsr_imp && host->dsr_req) 705 return sprintf(buf, "0x%x\n", host->dsr); 706 else 707 /* return default DSR value */ 708 return sprintf(buf, "0x%x\n", 0x404); 709 } 710 711 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL); 712 713 static struct attribute *sd_std_attrs[] = { 714 &dev_attr_cid.attr, 715 &dev_attr_csd.attr, 716 &dev_attr_scr.attr, 717 &dev_attr_ssr.attr, 718 &dev_attr_date.attr, 719 &dev_attr_erase_size.attr, 720 &dev_attr_preferred_erase_size.attr, 721 &dev_attr_fwrev.attr, 722 &dev_attr_hwrev.attr, 723 &dev_attr_manfid.attr, 724 &dev_attr_name.attr, 725 &dev_attr_oemid.attr, 726 &dev_attr_serial.attr, 727 &dev_attr_ocr.attr, 728 &dev_attr_rca.attr, 729 &dev_attr_dsr.attr, 730 NULL, 731 }; 732 ATTRIBUTE_GROUPS(sd_std); 733 734 struct device_type sd_type = { 735 .groups = sd_std_groups, 736 }; 737 738 /* 739 * Fetch CID from card. 740 */ 741 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 742 { 743 int err; 744 u32 max_current; 745 int retries = 10; 746 u32 pocr = ocr; 747 748 try_again: 749 if (!retries) { 750 ocr &= ~SD_OCR_S18R; 751 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 752 } 753 754 /* 755 * Since we're changing the OCR value, we seem to 756 * need to tell some cards to go back to the idle 757 * state. We wait 1ms to give cards time to 758 * respond. 759 */ 760 mmc_go_idle(host); 761 762 /* 763 * If SD_SEND_IF_COND indicates an SD 2.0 764 * compliant card and we should set bit 30 765 * of the ocr to indicate that we can handle 766 * block-addressed SDHC cards. 767 */ 768 err = mmc_send_if_cond(host, ocr); 769 if (!err) 770 ocr |= SD_OCR_CCS; 771 772 /* 773 * If the host supports one of UHS-I modes, request the card 774 * to switch to 1.8V signaling level. If the card has failed 775 * repeatedly to switch however, skip this. 776 */ 777 if (retries && mmc_host_uhs(host)) 778 ocr |= SD_OCR_S18R; 779 780 /* 781 * If the host can supply more than 150mA at current voltage, 782 * XPC should be set to 1. 783 */ 784 max_current = sd_get_host_max_current(host); 785 if (max_current > 150) 786 ocr |= SD_OCR_XPC; 787 788 err = mmc_send_app_op_cond(host, ocr, rocr); 789 if (err) 790 return err; 791 792 /* 793 * In case CCS and S18A in the response is set, start Signal Voltage 794 * Switch procedure. SPI mode doesn't support CMD11. 795 */ 796 if (!mmc_host_is_spi(host) && rocr && 797 ((*rocr & 0x41000000) == 0x41000000)) { 798 err = mmc_set_uhs_voltage(host, pocr); 799 if (err == -EAGAIN) { 800 retries--; 801 goto try_again; 802 } else if (err) { 803 retries = 0; 804 goto try_again; 805 } 806 } 807 808 err = mmc_send_cid(host, cid); 809 return err; 810 } 811 812 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 813 { 814 int err; 815 816 /* 817 * Fetch CSD from card. 818 */ 819 err = mmc_send_csd(card, card->raw_csd); 820 if (err) 821 return err; 822 823 err = mmc_decode_csd(card); 824 if (err) 825 return err; 826 827 return 0; 828 } 829 830 static int mmc_sd_get_ro(struct mmc_host *host) 831 { 832 int ro; 833 834 /* 835 * Some systems don't feature a write-protect pin and don't need one. 836 * E.g. because they only have micro-SD card slot. For those systems 837 * assume that the SD card is always read-write. 838 */ 839 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT) 840 return 0; 841 842 if (!host->ops->get_ro) 843 return -1; 844 845 ro = host->ops->get_ro(host); 846 847 return ro; 848 } 849 850 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 851 bool reinit) 852 { 853 int err; 854 855 if (!reinit) { 856 /* 857 * Fetch SCR from card. 858 */ 859 err = mmc_app_send_scr(card); 860 if (err) 861 return err; 862 863 err = mmc_decode_scr(card); 864 if (err) 865 return err; 866 867 /* 868 * Fetch and process SD Status register. 869 */ 870 err = mmc_read_ssr(card); 871 if (err) 872 return err; 873 874 /* Erase init depends on CSD and SSR */ 875 mmc_init_erase(card); 876 877 /* 878 * Fetch switch information from card. 879 */ 880 err = mmc_read_switch(card); 881 if (err) 882 return err; 883 } 884 885 /* 886 * For SPI, enable CRC as appropriate. 887 * This CRC enable is located AFTER the reading of the 888 * card registers because some SDHC cards are not able 889 * to provide valid CRCs for non-512-byte blocks. 890 */ 891 if (mmc_host_is_spi(host)) { 892 err = mmc_spi_set_crc(host, use_spi_crc); 893 if (err) 894 return err; 895 } 896 897 /* 898 * Check if read-only switch is active. 899 */ 900 if (!reinit) { 901 int ro = mmc_sd_get_ro(host); 902 903 if (ro < 0) { 904 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n", 905 mmc_hostname(host)); 906 } else if (ro > 0) { 907 mmc_card_set_readonly(card); 908 } 909 } 910 911 return 0; 912 } 913 914 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 915 { 916 unsigned max_dtr = (unsigned int)-1; 917 918 if (mmc_card_hs(card)) { 919 if (max_dtr > card->sw_caps.hs_max_dtr) 920 max_dtr = card->sw_caps.hs_max_dtr; 921 } else if (max_dtr > card->csd.max_dtr) { 922 max_dtr = card->csd.max_dtr; 923 } 924 925 return max_dtr; 926 } 927 928 static bool mmc_sd_card_using_v18(struct mmc_card *card) 929 { 930 /* 931 * According to the SD spec., the Bus Speed Mode (function group 1) bits 932 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus 933 * they can be used to determine if the card has already switched to 934 * 1.8V signaling. 935 */ 936 return card->sw_caps.sd3_bus_mode & 937 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); 938 } 939 940 /* 941 * Handle the detection and initialisation of a card. 942 * 943 * In the case of a resume, "oldcard" will contain the card 944 * we're trying to reinitialise. 945 */ 946 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 947 struct mmc_card *oldcard) 948 { 949 struct mmc_card *card; 950 int err; 951 u32 cid[4]; 952 u32 rocr = 0; 953 bool v18_fixup_failed = false; 954 955 WARN_ON(!host->claimed); 956 retry: 957 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 958 if (err) 959 return err; 960 961 if (oldcard) { 962 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { 963 pr_debug("%s: Perhaps the card was replaced\n", 964 mmc_hostname(host)); 965 return -ENOENT; 966 } 967 968 card = oldcard; 969 } else { 970 /* 971 * Allocate card structure. 972 */ 973 card = mmc_alloc_card(host, &sd_type); 974 if (IS_ERR(card)) 975 return PTR_ERR(card); 976 977 card->ocr = ocr; 978 card->type = MMC_TYPE_SD; 979 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 980 } 981 982 /* 983 * Call the optional HC's init_card function to handle quirks. 984 */ 985 if (host->ops->init_card) 986 host->ops->init_card(host, card); 987 988 /* 989 * For native busses: get card RCA and quit open drain mode. 990 */ 991 if (!mmc_host_is_spi(host)) { 992 err = mmc_send_relative_addr(host, &card->rca); 993 if (err) 994 goto free_card; 995 } 996 997 if (!oldcard) { 998 err = mmc_sd_get_csd(host, card); 999 if (err) 1000 goto free_card; 1001 1002 mmc_decode_cid(card); 1003 } 1004 1005 /* 1006 * handling only for cards supporting DSR and hosts requesting 1007 * DSR configuration 1008 */ 1009 if (card->csd.dsr_imp && host->dsr_req) 1010 mmc_set_dsr(host); 1011 1012 /* 1013 * Select card, as all following commands rely on that. 1014 */ 1015 if (!mmc_host_is_spi(host)) { 1016 err = mmc_select_card(card); 1017 if (err) 1018 goto free_card; 1019 } 1020 1021 err = mmc_sd_setup_card(host, card, oldcard != NULL); 1022 if (err) 1023 goto free_card; 1024 1025 /* 1026 * If the card has not been power cycled, it may still be using 1.8V 1027 * signaling. Detect that situation and try to initialize a UHS-I (1.8V) 1028 * transfer mode. 1029 */ 1030 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) && 1031 mmc_sd_card_using_v18(card) && 1032 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { 1033 /* 1034 * Re-read switch information in case it has changed since 1035 * oldcard was initialized. 1036 */ 1037 if (oldcard) { 1038 err = mmc_read_switch(card); 1039 if (err) 1040 goto free_card; 1041 } 1042 if (mmc_sd_card_using_v18(card)) { 1043 if (mmc_host_set_uhs_voltage(host) || 1044 mmc_sd_init_uhs_card(card)) { 1045 v18_fixup_failed = true; 1046 mmc_power_cycle(host, ocr); 1047 if (!oldcard) 1048 mmc_remove_card(card); 1049 goto retry; 1050 } 1051 goto done; 1052 } 1053 } 1054 1055 /* Initialization sequence for UHS-I cards */ 1056 if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { 1057 err = mmc_sd_init_uhs_card(card); 1058 if (err) 1059 goto free_card; 1060 } else { 1061 /* 1062 * Attempt to change to high-speed (if supported) 1063 */ 1064 err = mmc_sd_switch_hs(card); 1065 if (err > 0) 1066 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 1067 else if (err) 1068 goto free_card; 1069 1070 /* 1071 * Set bus speed. 1072 */ 1073 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 1074 1075 /* 1076 * Switch to wider bus (if supported). 1077 */ 1078 if ((host->caps & MMC_CAP_4_BIT_DATA) && 1079 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 1080 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 1081 if (err) 1082 goto free_card; 1083 1084 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1085 } 1086 } 1087 1088 if (host->caps2 & MMC_CAP2_AVOID_3_3V && 1089 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) { 1090 pr_err("%s: Host failed to negotiate down from 3.3V\n", 1091 mmc_hostname(host)); 1092 err = -EINVAL; 1093 goto free_card; 1094 } 1095 done: 1096 host->card = card; 1097 return 0; 1098 1099 free_card: 1100 if (!oldcard) 1101 mmc_remove_card(card); 1102 1103 return err; 1104 } 1105 1106 /* 1107 * Host is being removed. Free up the current card. 1108 */ 1109 static void mmc_sd_remove(struct mmc_host *host) 1110 { 1111 mmc_remove_card(host->card); 1112 host->card = NULL; 1113 } 1114 1115 /* 1116 * Card detection - card is alive. 1117 */ 1118 static int mmc_sd_alive(struct mmc_host *host) 1119 { 1120 return mmc_send_status(host->card, NULL); 1121 } 1122 1123 /* 1124 * Card detection callback from host. 1125 */ 1126 static void mmc_sd_detect(struct mmc_host *host) 1127 { 1128 int err; 1129 1130 mmc_get_card(host->card, NULL); 1131 1132 /* 1133 * Just check if our card has been removed. 1134 */ 1135 err = _mmc_detect_card_removed(host); 1136 1137 mmc_put_card(host->card, NULL); 1138 1139 if (err) { 1140 mmc_sd_remove(host); 1141 1142 mmc_claim_host(host); 1143 mmc_detach_bus(host); 1144 mmc_power_off(host); 1145 mmc_release_host(host); 1146 } 1147 } 1148 1149 static int _mmc_sd_suspend(struct mmc_host *host) 1150 { 1151 int err = 0; 1152 1153 mmc_claim_host(host); 1154 1155 if (mmc_card_suspended(host->card)) 1156 goto out; 1157 1158 if (!mmc_host_is_spi(host)) 1159 err = mmc_deselect_cards(host); 1160 1161 if (!err) { 1162 mmc_power_off(host); 1163 mmc_card_set_suspended(host->card); 1164 } 1165 1166 out: 1167 mmc_release_host(host); 1168 return err; 1169 } 1170 1171 /* 1172 * Callback for suspend 1173 */ 1174 static int mmc_sd_suspend(struct mmc_host *host) 1175 { 1176 int err; 1177 1178 err = _mmc_sd_suspend(host); 1179 if (!err) { 1180 pm_runtime_disable(&host->card->dev); 1181 pm_runtime_set_suspended(&host->card->dev); 1182 } 1183 1184 return err; 1185 } 1186 1187 /* 1188 * This function tries to determine if the same card is still present 1189 * and, if so, restore all state to it. 1190 */ 1191 static int _mmc_sd_resume(struct mmc_host *host) 1192 { 1193 int err = 0; 1194 1195 mmc_claim_host(host); 1196 1197 if (!mmc_card_suspended(host->card)) 1198 goto out; 1199 1200 mmc_power_up(host, host->card->ocr); 1201 err = mmc_sd_init_card(host, host->card->ocr, host->card); 1202 mmc_card_clr_suspended(host->card); 1203 1204 out: 1205 mmc_release_host(host); 1206 return err; 1207 } 1208 1209 /* 1210 * Callback for resume 1211 */ 1212 static int mmc_sd_resume(struct mmc_host *host) 1213 { 1214 pm_runtime_enable(&host->card->dev); 1215 return 0; 1216 } 1217 1218 /* 1219 * Callback for runtime_suspend. 1220 */ 1221 static int mmc_sd_runtime_suspend(struct mmc_host *host) 1222 { 1223 int err; 1224 1225 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) 1226 return 0; 1227 1228 err = _mmc_sd_suspend(host); 1229 if (err) 1230 pr_err("%s: error %d doing aggressive suspend\n", 1231 mmc_hostname(host), err); 1232 1233 return err; 1234 } 1235 1236 /* 1237 * Callback for runtime_resume. 1238 */ 1239 static int mmc_sd_runtime_resume(struct mmc_host *host) 1240 { 1241 int err; 1242 1243 err = _mmc_sd_resume(host); 1244 if (err && err != -ENOMEDIUM) 1245 pr_err("%s: error %d doing runtime resume\n", 1246 mmc_hostname(host), err); 1247 1248 return 0; 1249 } 1250 1251 static int mmc_sd_hw_reset(struct mmc_host *host) 1252 { 1253 mmc_power_cycle(host, host->card->ocr); 1254 return mmc_sd_init_card(host, host->card->ocr, host->card); 1255 } 1256 1257 static const struct mmc_bus_ops mmc_sd_ops = { 1258 .remove = mmc_sd_remove, 1259 .detect = mmc_sd_detect, 1260 .runtime_suspend = mmc_sd_runtime_suspend, 1261 .runtime_resume = mmc_sd_runtime_resume, 1262 .suspend = mmc_sd_suspend, 1263 .resume = mmc_sd_resume, 1264 .alive = mmc_sd_alive, 1265 .shutdown = mmc_sd_suspend, 1266 .hw_reset = mmc_sd_hw_reset, 1267 }; 1268 1269 /* 1270 * Starting point for SD card init. 1271 */ 1272 int mmc_attach_sd(struct mmc_host *host) 1273 { 1274 int err; 1275 u32 ocr, rocr; 1276 1277 WARN_ON(!host->claimed); 1278 1279 err = mmc_send_app_op_cond(host, 0, &ocr); 1280 if (err) 1281 return err; 1282 1283 mmc_attach_bus(host, &mmc_sd_ops); 1284 if (host->ocr_avail_sd) 1285 host->ocr_avail = host->ocr_avail_sd; 1286 1287 /* 1288 * We need to get OCR a different way for SPI. 1289 */ 1290 if (mmc_host_is_spi(host)) { 1291 mmc_go_idle(host); 1292 1293 err = mmc_spi_read_ocr(host, 0, &ocr); 1294 if (err) 1295 goto err; 1296 } 1297 1298 rocr = mmc_select_voltage(host, ocr); 1299 1300 /* 1301 * Can we support the voltage(s) of the card(s)? 1302 */ 1303 if (!rocr) { 1304 err = -EINVAL; 1305 goto err; 1306 } 1307 1308 /* 1309 * Detect and init the card. 1310 */ 1311 err = mmc_sd_init_card(host, rocr, NULL); 1312 if (err) 1313 goto err; 1314 1315 mmc_release_host(host); 1316 err = mmc_add_card(host->card); 1317 if (err) 1318 goto remove_card; 1319 1320 mmc_claim_host(host); 1321 return 0; 1322 1323 remove_card: 1324 mmc_remove_card(host->card); 1325 host->card = NULL; 1326 mmc_claim_host(host); 1327 err: 1328 mmc_detach_bus(host); 1329 1330 pr_err("%s: error %d whilst initialising SD card\n", 1331 mmc_hostname(host), err); 1332 1333 return err; 1334 } 1335