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 memset(&card->cid, 0, sizeof(struct mmc_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->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 115 csd->tacc_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->tacc_ns = 0; /* Unused */ 152 csd->tacc_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 (UNSTUFF_BITS(resp, 55, 1)) 213 card->erased_byte = 0xFF; 214 else 215 card->erased_byte = 0x0; 216 217 if (scr->sda_spec3) 218 scr->cmds = UNSTUFF_BITS(resp, 32, 2); 219 return 0; 220 } 221 222 /* 223 * Fetch and process SD Status register. 224 */ 225 static int mmc_read_ssr(struct mmc_card *card) 226 { 227 unsigned int au, es, et, eo; 228 int err, i; 229 u32 *ssr; 230 231 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 232 pr_warn("%s: card lacks mandatory SD Status function\n", 233 mmc_hostname(card->host)); 234 return 0; 235 } 236 237 ssr = kmalloc(64, GFP_KERNEL); 238 if (!ssr) 239 return -ENOMEM; 240 241 err = mmc_app_sd_status(card, ssr); 242 if (err) { 243 pr_warn("%s: problem reading SD Status register\n", 244 mmc_hostname(card->host)); 245 err = 0; 246 goto out; 247 } 248 249 for (i = 0; i < 16; i++) 250 ssr[i] = be32_to_cpu(ssr[i]); 251 252 /* 253 * UNSTUFF_BITS only works with four u32s so we have to offset the 254 * bitfield positions accordingly. 255 */ 256 au = UNSTUFF_BITS(ssr, 428 - 384, 4); 257 if (au) { 258 if (au <= 9 || card->scr.sda_spec3) { 259 card->ssr.au = sd_au_size[au]; 260 es = UNSTUFF_BITS(ssr, 408 - 384, 16); 261 et = UNSTUFF_BITS(ssr, 402 - 384, 6); 262 if (es && et) { 263 eo = UNSTUFF_BITS(ssr, 400 - 384, 2); 264 card->ssr.erase_timeout = (et * 1000) / es; 265 card->ssr.erase_offset = eo * 1000; 266 } 267 } else { 268 pr_warn("%s: SD Status: Invalid Allocation Unit size\n", 269 mmc_hostname(card->host)); 270 } 271 } 272 out: 273 kfree(ssr); 274 return err; 275 } 276 277 /* 278 * Fetches and decodes switch information 279 */ 280 static int mmc_read_switch(struct mmc_card *card) 281 { 282 int err; 283 u8 *status; 284 285 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 286 return 0; 287 288 if (!(card->csd.cmdclass & CCC_SWITCH)) { 289 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n", 290 mmc_hostname(card->host)); 291 return 0; 292 } 293 294 err = -EIO; 295 296 status = kmalloc(64, GFP_KERNEL); 297 if (!status) { 298 pr_err("%s: could not allocate a buffer for " 299 "switch capabilities.\n", 300 mmc_hostname(card->host)); 301 return -ENOMEM; 302 } 303 304 /* 305 * Find out the card's support bits with a mode 0 operation. 306 * The argument does not matter, as the support bits do not 307 * change with the arguments. 308 */ 309 err = mmc_sd_switch(card, 0, 0, 0, status); 310 if (err) { 311 /* 312 * If the host or the card can't do the switch, 313 * fail more gracefully. 314 */ 315 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 316 goto out; 317 318 pr_warn("%s: problem reading Bus Speed modes\n", 319 mmc_hostname(card->host)); 320 err = 0; 321 322 goto out; 323 } 324 325 if (status[13] & SD_MODE_HIGH_SPEED) 326 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; 327 328 if (card->scr.sda_spec3) { 329 card->sw_caps.sd3_bus_mode = status[13]; 330 /* Driver Strengths supported by the card */ 331 card->sw_caps.sd3_drv_type = status[9]; 332 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8; 333 } 334 335 out: 336 kfree(status); 337 338 return err; 339 } 340 341 /* 342 * Test if the card supports high-speed mode and, if so, switch to it. 343 */ 344 int mmc_sd_switch_hs(struct mmc_card *card) 345 { 346 int err; 347 u8 *status; 348 349 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 350 return 0; 351 352 if (!(card->csd.cmdclass & CCC_SWITCH)) 353 return 0; 354 355 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 356 return 0; 357 358 if (card->sw_caps.hs_max_dtr == 0) 359 return 0; 360 361 status = kmalloc(64, GFP_KERNEL); 362 if (!status) { 363 pr_err("%s: could not allocate a buffer for " 364 "switch capabilities.\n", mmc_hostname(card->host)); 365 return -ENOMEM; 366 } 367 368 err = mmc_sd_switch(card, 1, 0, 1, status); 369 if (err) 370 goto out; 371 372 if ((status[16] & 0xF) != 1) { 373 pr_warn("%s: Problem switching card into high-speed mode!\n", 374 mmc_hostname(card->host)); 375 err = 0; 376 } else { 377 err = 1; 378 } 379 380 out: 381 kfree(status); 382 383 return err; 384 } 385 386 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 387 { 388 int card_drv_type, drive_strength, drv_type; 389 int err; 390 391 card->drive_strength = 0; 392 393 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; 394 395 drive_strength = mmc_select_drive_strength(card, 396 card->sw_caps.uhs_max_dtr, 397 card_drv_type, &drv_type); 398 399 if (drive_strength) { 400 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 401 if (err) 402 return err; 403 if ((status[15] & 0xF) != drive_strength) { 404 pr_warn("%s: Problem setting drive strength!\n", 405 mmc_hostname(card->host)); 406 return 0; 407 } 408 card->drive_strength = drive_strength; 409 } 410 411 if (drv_type) 412 mmc_set_driver_type(card->host, drv_type); 413 414 return 0; 415 } 416 417 static void sd_update_bus_speed_mode(struct mmc_card *card) 418 { 419 /* 420 * If the host doesn't support any of the UHS-I modes, fallback on 421 * default speed. 422 */ 423 if (!mmc_host_uhs(card->host)) { 424 card->sd_bus_speed = 0; 425 return; 426 } 427 428 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 429 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 430 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 431 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 432 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 433 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 434 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 435 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 436 SD_MODE_UHS_SDR50)) { 437 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 438 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 439 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 440 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 441 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 442 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 443 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 444 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 445 SD_MODE_UHS_SDR12)) { 446 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 447 } 448 } 449 450 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 451 { 452 int err; 453 unsigned int timing = 0; 454 455 switch (card->sd_bus_speed) { 456 case UHS_SDR104_BUS_SPEED: 457 timing = MMC_TIMING_UHS_SDR104; 458 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 459 break; 460 case UHS_DDR50_BUS_SPEED: 461 timing = MMC_TIMING_UHS_DDR50; 462 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 463 break; 464 case UHS_SDR50_BUS_SPEED: 465 timing = MMC_TIMING_UHS_SDR50; 466 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 467 break; 468 case UHS_SDR25_BUS_SPEED: 469 timing = MMC_TIMING_UHS_SDR25; 470 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 471 break; 472 case UHS_SDR12_BUS_SPEED: 473 timing = MMC_TIMING_UHS_SDR12; 474 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 475 break; 476 default: 477 return 0; 478 } 479 480 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 481 if (err) 482 return err; 483 484 if ((status[16] & 0xF) != card->sd_bus_speed) 485 pr_warn("%s: Problem setting bus speed mode!\n", 486 mmc_hostname(card->host)); 487 else { 488 mmc_set_timing(card->host, timing); 489 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 490 } 491 492 return 0; 493 } 494 495 /* Get host's max current setting at its current voltage */ 496 static u32 sd_get_host_max_current(struct mmc_host *host) 497 { 498 u32 voltage, max_current; 499 500 voltage = 1 << host->ios.vdd; 501 switch (voltage) { 502 case MMC_VDD_165_195: 503 max_current = host->max_current_180; 504 break; 505 case MMC_VDD_29_30: 506 case MMC_VDD_30_31: 507 max_current = host->max_current_300; 508 break; 509 case MMC_VDD_32_33: 510 case MMC_VDD_33_34: 511 max_current = host->max_current_330; 512 break; 513 default: 514 max_current = 0; 515 } 516 517 return max_current; 518 } 519 520 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 521 { 522 int current_limit = SD_SET_CURRENT_NO_CHANGE; 523 int err; 524 u32 max_current; 525 526 /* 527 * Current limit switch is only defined for SDR50, SDR104, and DDR50 528 * bus speed modes. For other bus speed modes, we do not change the 529 * current limit. 530 */ 531 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && 532 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && 533 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) 534 return 0; 535 536 /* 537 * Host has different current capabilities when operating at 538 * different voltages, so find out its max current first. 539 */ 540 max_current = sd_get_host_max_current(card->host); 541 542 /* 543 * We only check host's capability here, if we set a limit that is 544 * higher than the card's maximum current, the card will be using its 545 * maximum current, e.g. if the card's maximum current is 300ma, and 546 * when we set current limit to 200ma, the card will draw 200ma, and 547 * when we set current limit to 400/600/800ma, the card will draw its 548 * maximum 300ma from the host. 549 * 550 * The above is incorrect: if we try to set a current limit that is 551 * not supported by the card, the card can rightfully error out the 552 * attempt, and remain at the default current limit. This results 553 * in a 300mA card being limited to 200mA even though the host 554 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with 555 * an iMX6 host. --rmk 556 */ 557 if (max_current >= 800 && 558 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) 559 current_limit = SD_SET_CURRENT_LIMIT_800; 560 else if (max_current >= 600 && 561 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) 562 current_limit = SD_SET_CURRENT_LIMIT_600; 563 else if (max_current >= 400 && 564 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) 565 current_limit = SD_SET_CURRENT_LIMIT_400; 566 else if (max_current >= 200 && 567 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) 568 current_limit = SD_SET_CURRENT_LIMIT_200; 569 570 if (current_limit != SD_SET_CURRENT_NO_CHANGE) { 571 err = mmc_sd_switch(card, 1, 3, current_limit, status); 572 if (err) 573 return err; 574 575 if (((status[15] >> 4) & 0x0F) != current_limit) 576 pr_warn("%s: Problem setting current limit!\n", 577 mmc_hostname(card->host)); 578 579 } 580 581 return 0; 582 } 583 584 /* 585 * UHS-I specific initialization procedure 586 */ 587 static int mmc_sd_init_uhs_card(struct mmc_card *card) 588 { 589 int err; 590 u8 *status; 591 592 if (!card->scr.sda_spec3) 593 return 0; 594 595 if (!(card->csd.cmdclass & CCC_SWITCH)) 596 return 0; 597 598 status = kmalloc(64, GFP_KERNEL); 599 if (!status) { 600 pr_err("%s: could not allocate a buffer for " 601 "switch capabilities.\n", mmc_hostname(card->host)); 602 return -ENOMEM; 603 } 604 605 /* Set 4-bit bus width */ 606 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 607 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 608 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 609 if (err) 610 goto out; 611 612 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 613 } 614 615 /* 616 * Select the bus speed mode depending on host 617 * and card capability. 618 */ 619 sd_update_bus_speed_mode(card); 620 621 /* Set the driver strength for the card */ 622 err = sd_select_driver_type(card, status); 623 if (err) 624 goto out; 625 626 /* Set current limit for the card */ 627 err = sd_set_current_limit(card, status); 628 if (err) 629 goto out; 630 631 /* Set bus speed mode of the card */ 632 err = sd_set_bus_speed_mode(card, status); 633 if (err) 634 goto out; 635 636 /* 637 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 638 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 639 */ 640 if (!mmc_host_is_spi(card->host) && 641 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 || 642 card->host->ios.timing == MMC_TIMING_UHS_DDR50 || 643 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) { 644 err = mmc_execute_tuning(card); 645 646 /* 647 * As SD Specifications Part1 Physical Layer Specification 648 * Version 3.01 says, CMD19 tuning is available for unlocked 649 * cards in transfer state of 1.8V signaling mode. The small 650 * difference between v3.00 and 3.01 spec means that CMD19 651 * tuning is also available for DDR50 mode. 652 */ 653 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) { 654 pr_warn("%s: ddr50 tuning failed\n", 655 mmc_hostname(card->host)); 656 err = 0; 657 } 658 } 659 660 out: 661 kfree(status); 662 663 return err; 664 } 665 666 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 667 card->raw_cid[2], card->raw_cid[3]); 668 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 669 card->raw_csd[2], card->raw_csd[3]); 670 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 671 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 672 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 673 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 674 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 675 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 676 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 677 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 678 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 679 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 680 681 682 static struct attribute *sd_std_attrs[] = { 683 &dev_attr_cid.attr, 684 &dev_attr_csd.attr, 685 &dev_attr_scr.attr, 686 &dev_attr_date.attr, 687 &dev_attr_erase_size.attr, 688 &dev_attr_preferred_erase_size.attr, 689 &dev_attr_fwrev.attr, 690 &dev_attr_hwrev.attr, 691 &dev_attr_manfid.attr, 692 &dev_attr_name.attr, 693 &dev_attr_oemid.attr, 694 &dev_attr_serial.attr, 695 NULL, 696 }; 697 ATTRIBUTE_GROUPS(sd_std); 698 699 struct device_type sd_type = { 700 .groups = sd_std_groups, 701 }; 702 703 /* 704 * Fetch CID from card. 705 */ 706 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 707 { 708 int err; 709 u32 max_current; 710 int retries = 10; 711 u32 pocr = ocr; 712 713 try_again: 714 if (!retries) { 715 ocr &= ~SD_OCR_S18R; 716 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 717 } 718 719 /* 720 * Since we're changing the OCR value, we seem to 721 * need to tell some cards to go back to the idle 722 * state. We wait 1ms to give cards time to 723 * respond. 724 */ 725 mmc_go_idle(host); 726 727 /* 728 * If SD_SEND_IF_COND indicates an SD 2.0 729 * compliant card and we should set bit 30 730 * of the ocr to indicate that we can handle 731 * block-addressed SDHC cards. 732 */ 733 err = mmc_send_if_cond(host, ocr); 734 if (!err) 735 ocr |= SD_OCR_CCS; 736 737 /* 738 * If the host supports one of UHS-I modes, request the card 739 * to switch to 1.8V signaling level. If the card has failed 740 * repeatedly to switch however, skip this. 741 */ 742 if (retries && mmc_host_uhs(host)) 743 ocr |= SD_OCR_S18R; 744 745 /* 746 * If the host can supply more than 150mA at current voltage, 747 * XPC should be set to 1. 748 */ 749 max_current = sd_get_host_max_current(host); 750 if (max_current > 150) 751 ocr |= SD_OCR_XPC; 752 753 err = mmc_send_app_op_cond(host, ocr, rocr); 754 if (err) 755 return err; 756 757 /* 758 * In case CCS and S18A in the response is set, start Signal Voltage 759 * Switch procedure. SPI mode doesn't support CMD11. 760 */ 761 if (!mmc_host_is_spi(host) && rocr && 762 ((*rocr & 0x41000000) == 0x41000000)) { 763 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 764 pocr); 765 if (err == -EAGAIN) { 766 retries--; 767 goto try_again; 768 } else if (err) { 769 retries = 0; 770 goto try_again; 771 } 772 } 773 774 if (mmc_host_is_spi(host)) 775 err = mmc_send_cid(host, cid); 776 else 777 err = mmc_all_send_cid(host, cid); 778 779 return err; 780 } 781 782 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 783 { 784 int err; 785 786 /* 787 * Fetch CSD from card. 788 */ 789 err = mmc_send_csd(card, card->raw_csd); 790 if (err) 791 return err; 792 793 err = mmc_decode_csd(card); 794 if (err) 795 return err; 796 797 return 0; 798 } 799 800 static int mmc_sd_get_ro(struct mmc_host *host) 801 { 802 int ro; 803 804 /* 805 * Some systems don't feature a write-protect pin and don't need one. 806 * E.g. because they only have micro-SD card slot. For those systems 807 * assume that the SD card is always read-write. 808 */ 809 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT) 810 return 0; 811 812 if (!host->ops->get_ro) 813 return -1; 814 815 ro = host->ops->get_ro(host); 816 817 return ro; 818 } 819 820 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 821 bool reinit) 822 { 823 int err; 824 825 if (!reinit) { 826 /* 827 * Fetch SCR from card. 828 */ 829 err = mmc_app_send_scr(card, card->raw_scr); 830 if (err) 831 return err; 832 833 err = mmc_decode_scr(card); 834 if (err) 835 return err; 836 837 /* 838 * Fetch and process SD Status register. 839 */ 840 err = mmc_read_ssr(card); 841 if (err) 842 return err; 843 844 /* Erase init depends on CSD and SSR */ 845 mmc_init_erase(card); 846 847 /* 848 * Fetch switch information from card. 849 */ 850 err = mmc_read_switch(card); 851 if (err) 852 return err; 853 } 854 855 /* 856 * For SPI, enable CRC as appropriate. 857 * This CRC enable is located AFTER the reading of the 858 * card registers because some SDHC cards are not able 859 * to provide valid CRCs for non-512-byte blocks. 860 */ 861 if (mmc_host_is_spi(host)) { 862 err = mmc_spi_set_crc(host, use_spi_crc); 863 if (err) 864 return err; 865 } 866 867 /* 868 * Check if read-only switch is active. 869 */ 870 if (!reinit) { 871 int ro = mmc_sd_get_ro(host); 872 873 if (ro < 0) { 874 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n", 875 mmc_hostname(host)); 876 } else if (ro > 0) { 877 mmc_card_set_readonly(card); 878 } 879 } 880 881 return 0; 882 } 883 884 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 885 { 886 unsigned max_dtr = (unsigned int)-1; 887 888 if (mmc_card_hs(card)) { 889 if (max_dtr > card->sw_caps.hs_max_dtr) 890 max_dtr = card->sw_caps.hs_max_dtr; 891 } else if (max_dtr > card->csd.max_dtr) { 892 max_dtr = card->csd.max_dtr; 893 } 894 895 return max_dtr; 896 } 897 898 /* 899 * Handle the detection and initialisation of a card. 900 * 901 * In the case of a resume, "oldcard" will contain the card 902 * we're trying to reinitialise. 903 */ 904 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 905 struct mmc_card *oldcard) 906 { 907 struct mmc_card *card; 908 int err; 909 u32 cid[4]; 910 u32 rocr = 0; 911 912 BUG_ON(!host); 913 WARN_ON(!host->claimed); 914 915 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 916 if (err) 917 return err; 918 919 if (oldcard) { 920 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 921 return -ENOENT; 922 923 card = oldcard; 924 } else { 925 /* 926 * Allocate card structure. 927 */ 928 card = mmc_alloc_card(host, &sd_type); 929 if (IS_ERR(card)) 930 return PTR_ERR(card); 931 932 card->ocr = ocr; 933 card->type = MMC_TYPE_SD; 934 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 935 } 936 937 /* 938 * Call the optional HC's init_card function to handle quirks. 939 */ 940 if (host->ops->init_card) 941 host->ops->init_card(host, card); 942 943 /* 944 * For native busses: get card RCA and quit open drain mode. 945 */ 946 if (!mmc_host_is_spi(host)) { 947 err = mmc_send_relative_addr(host, &card->rca); 948 if (err) 949 goto free_card; 950 } 951 952 if (!oldcard) { 953 err = mmc_sd_get_csd(host, card); 954 if (err) 955 goto free_card; 956 957 mmc_decode_cid(card); 958 } 959 960 /* 961 * handling only for cards supporting DSR and hosts requesting 962 * DSR configuration 963 */ 964 if (card->csd.dsr_imp && host->dsr_req) 965 mmc_set_dsr(host); 966 967 /* 968 * Select card, as all following commands rely on that. 969 */ 970 if (!mmc_host_is_spi(host)) { 971 err = mmc_select_card(card); 972 if (err) 973 goto free_card; 974 } 975 976 err = mmc_sd_setup_card(host, card, oldcard != NULL); 977 if (err) 978 goto free_card; 979 980 /* Initialization sequence for UHS-I cards */ 981 if (rocr & SD_ROCR_S18A) { 982 err = mmc_sd_init_uhs_card(card); 983 if (err) 984 goto free_card; 985 } else { 986 /* 987 * Attempt to change to high-speed (if supported) 988 */ 989 err = mmc_sd_switch_hs(card); 990 if (err > 0) 991 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 992 else if (err) 993 goto free_card; 994 995 /* 996 * Set bus speed. 997 */ 998 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 999 1000 /* 1001 * Switch to wider bus (if supported). 1002 */ 1003 if ((host->caps & MMC_CAP_4_BIT_DATA) && 1004 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 1005 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 1006 if (err) 1007 goto free_card; 1008 1009 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1010 } 1011 } 1012 1013 host->card = card; 1014 return 0; 1015 1016 free_card: 1017 if (!oldcard) 1018 mmc_remove_card(card); 1019 1020 return err; 1021 } 1022 1023 /* 1024 * Host is being removed. Free up the current card. 1025 */ 1026 static void mmc_sd_remove(struct mmc_host *host) 1027 { 1028 BUG_ON(!host); 1029 BUG_ON(!host->card); 1030 1031 mmc_remove_card(host->card); 1032 host->card = NULL; 1033 } 1034 1035 /* 1036 * Card detection - card is alive. 1037 */ 1038 static int mmc_sd_alive(struct mmc_host *host) 1039 { 1040 return mmc_send_status(host->card, NULL); 1041 } 1042 1043 /* 1044 * Card detection callback from host. 1045 */ 1046 static void mmc_sd_detect(struct mmc_host *host) 1047 { 1048 int err; 1049 1050 BUG_ON(!host); 1051 BUG_ON(!host->card); 1052 1053 mmc_get_card(host->card); 1054 1055 /* 1056 * Just check if our card has been removed. 1057 */ 1058 err = _mmc_detect_card_removed(host); 1059 1060 mmc_put_card(host->card); 1061 1062 if (err) { 1063 mmc_sd_remove(host); 1064 1065 mmc_claim_host(host); 1066 mmc_detach_bus(host); 1067 mmc_power_off(host); 1068 mmc_release_host(host); 1069 } 1070 } 1071 1072 static int _mmc_sd_suspend(struct mmc_host *host) 1073 { 1074 int err = 0; 1075 1076 BUG_ON(!host); 1077 BUG_ON(!host->card); 1078 1079 mmc_claim_host(host); 1080 1081 if (mmc_card_suspended(host->card)) 1082 goto out; 1083 1084 if (!mmc_host_is_spi(host)) 1085 err = mmc_deselect_cards(host); 1086 1087 if (!err) { 1088 mmc_power_off(host); 1089 mmc_card_set_suspended(host->card); 1090 } 1091 1092 out: 1093 mmc_release_host(host); 1094 return err; 1095 } 1096 1097 /* 1098 * Callback for suspend 1099 */ 1100 static int mmc_sd_suspend(struct mmc_host *host) 1101 { 1102 int err; 1103 1104 err = _mmc_sd_suspend(host); 1105 if (!err) { 1106 pm_runtime_disable(&host->card->dev); 1107 pm_runtime_set_suspended(&host->card->dev); 1108 } 1109 1110 return err; 1111 } 1112 1113 /* 1114 * This function tries to determine if the same card is still present 1115 * and, if so, restore all state to it. 1116 */ 1117 static int _mmc_sd_resume(struct mmc_host *host) 1118 { 1119 int err = 0; 1120 1121 BUG_ON(!host); 1122 BUG_ON(!host->card); 1123 1124 mmc_claim_host(host); 1125 1126 if (!mmc_card_suspended(host->card)) 1127 goto out; 1128 1129 mmc_power_up(host, host->card->ocr); 1130 err = mmc_sd_init_card(host, host->card->ocr, host->card); 1131 mmc_card_clr_suspended(host->card); 1132 1133 out: 1134 mmc_release_host(host); 1135 return err; 1136 } 1137 1138 /* 1139 * Callback for resume 1140 */ 1141 static int mmc_sd_resume(struct mmc_host *host) 1142 { 1143 pm_runtime_enable(&host->card->dev); 1144 return 0; 1145 } 1146 1147 /* 1148 * Callback for runtime_suspend. 1149 */ 1150 static int mmc_sd_runtime_suspend(struct mmc_host *host) 1151 { 1152 int err; 1153 1154 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) 1155 return 0; 1156 1157 err = _mmc_sd_suspend(host); 1158 if (err) 1159 pr_err("%s: error %d doing aggressive suspend\n", 1160 mmc_hostname(host), err); 1161 1162 return err; 1163 } 1164 1165 /* 1166 * Callback for runtime_resume. 1167 */ 1168 static int mmc_sd_runtime_resume(struct mmc_host *host) 1169 { 1170 int err; 1171 1172 err = _mmc_sd_resume(host); 1173 if (err && err != -ENOMEDIUM) 1174 pr_err("%s: error %d doing runtime resume\n", 1175 mmc_hostname(host), err); 1176 1177 return 0; 1178 } 1179 1180 static int mmc_sd_reset(struct mmc_host *host) 1181 { 1182 mmc_power_cycle(host, host->card->ocr); 1183 return mmc_sd_init_card(host, host->card->ocr, host->card); 1184 } 1185 1186 static const struct mmc_bus_ops mmc_sd_ops = { 1187 .remove = mmc_sd_remove, 1188 .detect = mmc_sd_detect, 1189 .runtime_suspend = mmc_sd_runtime_suspend, 1190 .runtime_resume = mmc_sd_runtime_resume, 1191 .suspend = mmc_sd_suspend, 1192 .resume = mmc_sd_resume, 1193 .alive = mmc_sd_alive, 1194 .shutdown = mmc_sd_suspend, 1195 .reset = mmc_sd_reset, 1196 }; 1197 1198 /* 1199 * Starting point for SD card init. 1200 */ 1201 int mmc_attach_sd(struct mmc_host *host) 1202 { 1203 int err; 1204 u32 ocr, rocr; 1205 1206 BUG_ON(!host); 1207 WARN_ON(!host->claimed); 1208 1209 err = mmc_send_app_op_cond(host, 0, &ocr); 1210 if (err) 1211 return err; 1212 1213 mmc_attach_bus(host, &mmc_sd_ops); 1214 if (host->ocr_avail_sd) 1215 host->ocr_avail = host->ocr_avail_sd; 1216 1217 /* 1218 * We need to get OCR a different way for SPI. 1219 */ 1220 if (mmc_host_is_spi(host)) { 1221 mmc_go_idle(host); 1222 1223 err = mmc_spi_read_ocr(host, 0, &ocr); 1224 if (err) 1225 goto err; 1226 } 1227 1228 rocr = mmc_select_voltage(host, ocr); 1229 1230 /* 1231 * Can we support the voltage(s) of the card(s)? 1232 */ 1233 if (!rocr) { 1234 err = -EINVAL; 1235 goto err; 1236 } 1237 1238 /* 1239 * Detect and init the card. 1240 */ 1241 err = mmc_sd_init_card(host, rocr, NULL); 1242 if (err) 1243 goto err; 1244 1245 mmc_release_host(host); 1246 err = mmc_add_card(host->card); 1247 if (err) 1248 goto remove_card; 1249 1250 mmc_claim_host(host); 1251 return 0; 1252 1253 remove_card: 1254 mmc_remove_card(host->card); 1255 host->card = NULL; 1256 mmc_claim_host(host); 1257 err: 1258 mmc_detach_bus(host); 1259 1260 pr_err("%s: error %d whilst initialising SD card\n", 1261 mmc_hostname(host), err); 1262 1263 return err; 1264 } 1265