1 /* 2 * linux/drivers/mmc/core/sd.c 3 * 4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved. 5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. 6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/err.h> 14 #include <linux/slab.h> 15 #include <linux/stat.h> 16 #include <linux/pm_runtime.h> 17 18 #include <linux/mmc/host.h> 19 #include <linux/mmc/card.h> 20 #include <linux/mmc/mmc.h> 21 #include <linux/mmc/sd.h> 22 23 #include "core.h" 24 #include "bus.h" 25 #include "mmc_ops.h" 26 #include "sd.h" 27 #include "sd_ops.h" 28 29 static const unsigned int tran_exp[] = { 30 10000, 100000, 1000000, 10000000, 31 0, 0, 0, 0 32 }; 33 34 static const unsigned char tran_mant[] = { 35 0, 10, 12, 13, 15, 20, 25, 30, 36 35, 40, 45, 50, 55, 60, 70, 80, 37 }; 38 39 static const unsigned int tacc_exp[] = { 40 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 41 }; 42 43 static const unsigned int tacc_mant[] = { 44 0, 10, 12, 13, 15, 20, 25, 30, 45 35, 40, 45, 50, 55, 60, 70, 80, 46 }; 47 48 #define UNSTUFF_BITS(resp,start,size) \ 49 ({ \ 50 const int __size = size; \ 51 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 52 const int __off = 3 - ((start) / 32); \ 53 const int __shft = (start) & 31; \ 54 u32 __res; \ 55 \ 56 __res = resp[__off] >> __shft; \ 57 if (__size + __shft > 32) \ 58 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 59 __res & __mask; \ 60 }) 61 62 /* 63 * Given the decoded CSD structure, decode the raw CID to our CID structure. 64 */ 65 void mmc_decode_cid(struct mmc_card *card) 66 { 67 u32 *resp = card->raw_cid; 68 69 memset(&card->cid, 0, sizeof(struct mmc_cid)); 70 71 /* 72 * SD doesn't currently have a version field so we will 73 * have to assume we can parse this. 74 */ 75 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 76 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 77 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 78 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 79 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 80 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 81 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 82 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); 83 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); 84 card->cid.serial = UNSTUFF_BITS(resp, 24, 32); 85 card->cid.year = UNSTUFF_BITS(resp, 12, 8); 86 card->cid.month = UNSTUFF_BITS(resp, 8, 4); 87 88 card->cid.year += 2000; /* SD cards year offset */ 89 } 90 91 /* 92 * Given a 128-bit response, decode to our card CSD structure. 93 */ 94 static int mmc_decode_csd(struct mmc_card *card) 95 { 96 struct mmc_csd *csd = &card->csd; 97 unsigned int e, m, csd_struct; 98 u32 *resp = card->raw_csd; 99 100 csd_struct = UNSTUFF_BITS(resp, 126, 2); 101 102 switch (csd_struct) { 103 case 0: 104 m = UNSTUFF_BITS(resp, 115, 4); 105 e = UNSTUFF_BITS(resp, 112, 3); 106 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 107 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 108 109 m = UNSTUFF_BITS(resp, 99, 4); 110 e = UNSTUFF_BITS(resp, 96, 3); 111 csd->max_dtr = tran_exp[e] * tran_mant[m]; 112 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 113 114 e = UNSTUFF_BITS(resp, 47, 3); 115 m = UNSTUFF_BITS(resp, 62, 12); 116 csd->capacity = (1 + m) << (e + 2); 117 118 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 119 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 120 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 121 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 122 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 123 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 124 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 125 126 if (UNSTUFF_BITS(resp, 46, 1)) { 127 csd->erase_size = 1; 128 } else if (csd->write_blkbits >= 9) { 129 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; 130 csd->erase_size <<= csd->write_blkbits - 9; 131 } 132 break; 133 case 1: 134 /* 135 * This is a block-addressed SDHC or SDXC card. Most 136 * interesting fields are unused and have fixed 137 * values. To avoid getting tripped by buggy cards, 138 * we assume those fixed values ourselves. 139 */ 140 mmc_card_set_blockaddr(card); 141 142 csd->tacc_ns = 0; /* Unused */ 143 csd->tacc_clks = 0; /* Unused */ 144 145 m = UNSTUFF_BITS(resp, 99, 4); 146 e = UNSTUFF_BITS(resp, 96, 3); 147 csd->max_dtr = tran_exp[e] * tran_mant[m]; 148 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 149 csd->c_size = UNSTUFF_BITS(resp, 48, 22); 150 151 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */ 152 if (csd->c_size >= 0xFFFF) 153 mmc_card_set_ext_capacity(card); 154 155 m = UNSTUFF_BITS(resp, 48, 22); 156 csd->capacity = (1 + m) << 10; 157 158 csd->read_blkbits = 9; 159 csd->read_partial = 0; 160 csd->write_misalign = 0; 161 csd->read_misalign = 0; 162 csd->r2w_factor = 4; /* Unused */ 163 csd->write_blkbits = 9; 164 csd->write_partial = 0; 165 csd->erase_size = 1; 166 break; 167 default: 168 pr_err("%s: unrecognised CSD structure version %d\n", 169 mmc_hostname(card->host), csd_struct); 170 return -EINVAL; 171 } 172 173 card->erase_size = csd->erase_size; 174 175 return 0; 176 } 177 178 /* 179 * Given a 64-bit response, decode to our card SCR structure. 180 */ 181 static int mmc_decode_scr(struct mmc_card *card) 182 { 183 struct sd_scr *scr = &card->scr; 184 unsigned int scr_struct; 185 u32 resp[4]; 186 187 resp[3] = card->raw_scr[1]; 188 resp[2] = card->raw_scr[0]; 189 190 scr_struct = UNSTUFF_BITS(resp, 60, 4); 191 if (scr_struct != 0) { 192 pr_err("%s: unrecognised SCR structure version %d\n", 193 mmc_hostname(card->host), scr_struct); 194 return -EINVAL; 195 } 196 197 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 198 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 199 if (scr->sda_vsn == SCR_SPEC_VER_2) 200 /* Check if Physical Layer Spec v3.0 is supported */ 201 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); 202 203 if (UNSTUFF_BITS(resp, 55, 1)) 204 card->erased_byte = 0xFF; 205 else 206 card->erased_byte = 0x0; 207 208 if (scr->sda_spec3) 209 scr->cmds = UNSTUFF_BITS(resp, 32, 2); 210 return 0; 211 } 212 213 /* 214 * Fetch and process SD Status register. 215 */ 216 static int mmc_read_ssr(struct mmc_card *card) 217 { 218 unsigned int au, es, et, eo; 219 int err, i, max_au; 220 u32 *ssr; 221 222 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 223 pr_warning("%s: card lacks mandatory SD Status " 224 "function.\n", mmc_hostname(card->host)); 225 return 0; 226 } 227 228 ssr = kmalloc(64, GFP_KERNEL); 229 if (!ssr) 230 return -ENOMEM; 231 232 err = mmc_app_sd_status(card, ssr); 233 if (err) { 234 pr_warning("%s: problem reading SD Status " 235 "register.\n", mmc_hostname(card->host)); 236 err = 0; 237 goto out; 238 } 239 240 for (i = 0; i < 16; i++) 241 ssr[i] = be32_to_cpu(ssr[i]); 242 243 /* SD3.0 increases max AU size to 64MB (0xF) from 4MB (0x9) */ 244 max_au = card->scr.sda_spec3 ? 0xF : 0x9; 245 246 /* 247 * UNSTUFF_BITS only works with four u32s so we have to offset the 248 * bitfield positions accordingly. 249 */ 250 au = UNSTUFF_BITS(ssr, 428 - 384, 4); 251 if (au > 0 && au <= max_au) { 252 card->ssr.au = 1 << (au + 4); 253 es = UNSTUFF_BITS(ssr, 408 - 384, 16); 254 et = UNSTUFF_BITS(ssr, 402 - 384, 6); 255 eo = UNSTUFF_BITS(ssr, 400 - 384, 2); 256 if (es && et) { 257 card->ssr.erase_timeout = (et * 1000) / es; 258 card->ssr.erase_offset = eo * 1000; 259 } 260 } else { 261 pr_warning("%s: SD Status: Invalid Allocation Unit " 262 "size.\n", mmc_hostname(card->host)); 263 } 264 out: 265 kfree(ssr); 266 return err; 267 } 268 269 /* 270 * Fetches and decodes switch information 271 */ 272 static int mmc_read_switch(struct mmc_card *card) 273 { 274 int err; 275 u8 *status; 276 277 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 278 return 0; 279 280 if (!(card->csd.cmdclass & CCC_SWITCH)) { 281 pr_warning("%s: card lacks mandatory switch " 282 "function, performance might suffer.\n", 283 mmc_hostname(card->host)); 284 return 0; 285 } 286 287 err = -EIO; 288 289 status = kmalloc(64, GFP_KERNEL); 290 if (!status) { 291 pr_err("%s: could not allocate a buffer for " 292 "switch capabilities.\n", 293 mmc_hostname(card->host)); 294 return -ENOMEM; 295 } 296 297 /* 298 * Find out the card's support bits with a mode 0 operation. 299 * The argument does not matter, as the support bits do not 300 * change with the arguments. 301 */ 302 err = mmc_sd_switch(card, 0, 0, 0, status); 303 if (err) { 304 /* 305 * If the host or the card can't do the switch, 306 * fail more gracefully. 307 */ 308 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 309 goto out; 310 311 pr_warning("%s: problem reading Bus Speed modes.\n", 312 mmc_hostname(card->host)); 313 err = 0; 314 315 goto out; 316 } 317 318 if (status[13] & SD_MODE_HIGH_SPEED) 319 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; 320 321 if (card->scr.sda_spec3) { 322 card->sw_caps.sd3_bus_mode = status[13]; 323 /* Driver Strengths supported by the card */ 324 card->sw_caps.sd3_drv_type = status[9]; 325 } 326 327 out: 328 kfree(status); 329 330 return err; 331 } 332 333 /* 334 * Test if the card supports high-speed mode and, if so, switch to it. 335 */ 336 int mmc_sd_switch_hs(struct mmc_card *card) 337 { 338 int err; 339 u8 *status; 340 341 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 342 return 0; 343 344 if (!(card->csd.cmdclass & CCC_SWITCH)) 345 return 0; 346 347 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 348 return 0; 349 350 if (card->sw_caps.hs_max_dtr == 0) 351 return 0; 352 353 err = -EIO; 354 355 status = kmalloc(64, GFP_KERNEL); 356 if (!status) { 357 pr_err("%s: could not allocate a buffer for " 358 "switch capabilities.\n", mmc_hostname(card->host)); 359 return -ENOMEM; 360 } 361 362 err = mmc_sd_switch(card, 1, 0, 1, status); 363 if (err) 364 goto out; 365 366 if ((status[16] & 0xF) != 1) { 367 pr_warning("%s: Problem switching card " 368 "into high-speed mode!\n", 369 mmc_hostname(card->host)); 370 err = 0; 371 } else { 372 err = 1; 373 } 374 375 out: 376 kfree(status); 377 378 return err; 379 } 380 381 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 382 { 383 int host_drv_type = SD_DRIVER_TYPE_B; 384 int card_drv_type = SD_DRIVER_TYPE_B; 385 int drive_strength; 386 int err; 387 388 /* 389 * If the host doesn't support any of the Driver Types A,C or D, 390 * or there is no board specific handler then default Driver 391 * Type B is used. 392 */ 393 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C 394 | MMC_CAP_DRIVER_TYPE_D))) 395 return 0; 396 397 if (!card->host->ops->select_drive_strength) 398 return 0; 399 400 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) 401 host_drv_type |= SD_DRIVER_TYPE_A; 402 403 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) 404 host_drv_type |= SD_DRIVER_TYPE_C; 405 406 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) 407 host_drv_type |= SD_DRIVER_TYPE_D; 408 409 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) 410 card_drv_type |= SD_DRIVER_TYPE_A; 411 412 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 413 card_drv_type |= SD_DRIVER_TYPE_C; 414 415 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D) 416 card_drv_type |= SD_DRIVER_TYPE_D; 417 418 /* 419 * The drive strength that the hardware can support 420 * depends on the board design. Pass the appropriate 421 * information and let the hardware specific code 422 * return what is possible given the options 423 */ 424 mmc_host_clk_hold(card->host); 425 drive_strength = card->host->ops->select_drive_strength( 426 card->sw_caps.uhs_max_dtr, 427 host_drv_type, card_drv_type); 428 mmc_host_clk_release(card->host); 429 430 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 431 if (err) 432 return err; 433 434 if ((status[15] & 0xF) != drive_strength) { 435 pr_warning("%s: Problem setting drive strength!\n", 436 mmc_hostname(card->host)); 437 return 0; 438 } 439 440 mmc_set_driver_type(card->host, drive_strength); 441 442 return 0; 443 } 444 445 static void sd_update_bus_speed_mode(struct mmc_card *card) 446 { 447 /* 448 * If the host doesn't support any of the UHS-I modes, fallback on 449 * default speed. 450 */ 451 if (!mmc_host_uhs(card->host)) { 452 card->sd_bus_speed = 0; 453 return; 454 } 455 456 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 457 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 458 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 459 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 460 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 461 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 462 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 463 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 464 SD_MODE_UHS_SDR50)) { 465 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 466 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 467 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 468 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 469 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 470 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 471 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 472 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 473 SD_MODE_UHS_SDR12)) { 474 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 475 } 476 } 477 478 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 479 { 480 int err; 481 unsigned int timing = 0; 482 483 switch (card->sd_bus_speed) { 484 case UHS_SDR104_BUS_SPEED: 485 timing = MMC_TIMING_UHS_SDR104; 486 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 487 break; 488 case UHS_DDR50_BUS_SPEED: 489 timing = MMC_TIMING_UHS_DDR50; 490 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 491 break; 492 case UHS_SDR50_BUS_SPEED: 493 timing = MMC_TIMING_UHS_SDR50; 494 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 495 break; 496 case UHS_SDR25_BUS_SPEED: 497 timing = MMC_TIMING_UHS_SDR25; 498 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 499 break; 500 case UHS_SDR12_BUS_SPEED: 501 timing = MMC_TIMING_UHS_SDR12; 502 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 503 break; 504 default: 505 return 0; 506 } 507 508 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 509 if (err) 510 return err; 511 512 if ((status[16] & 0xF) != card->sd_bus_speed) 513 pr_warning("%s: Problem setting bus speed mode!\n", 514 mmc_hostname(card->host)); 515 else { 516 mmc_set_timing(card->host, timing); 517 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 518 } 519 520 return 0; 521 } 522 523 /* Get host's max current setting at its current voltage */ 524 static u32 sd_get_host_max_current(struct mmc_host *host) 525 { 526 u32 voltage, max_current; 527 528 voltage = 1 << host->ios.vdd; 529 switch (voltage) { 530 case MMC_VDD_165_195: 531 max_current = host->max_current_180; 532 break; 533 case MMC_VDD_29_30: 534 case MMC_VDD_30_31: 535 max_current = host->max_current_300; 536 break; 537 case MMC_VDD_32_33: 538 case MMC_VDD_33_34: 539 max_current = host->max_current_330; 540 break; 541 default: 542 max_current = 0; 543 } 544 545 return max_current; 546 } 547 548 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 549 { 550 int current_limit = SD_SET_CURRENT_NO_CHANGE; 551 int err; 552 u32 max_current; 553 554 /* 555 * Current limit switch is only defined for SDR50, SDR104, and DDR50 556 * bus speed modes. For other bus speed modes, we do not change the 557 * current limit. 558 */ 559 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && 560 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && 561 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) 562 return 0; 563 564 /* 565 * Host has different current capabilities when operating at 566 * different voltages, so find out its max current first. 567 */ 568 max_current = sd_get_host_max_current(card->host); 569 570 /* 571 * We only check host's capability here, if we set a limit that is 572 * higher than the card's maximum current, the card will be using its 573 * maximum current, e.g. if the card's maximum current is 300ma, and 574 * when we set current limit to 200ma, the card will draw 200ma, and 575 * when we set current limit to 400/600/800ma, the card will draw its 576 * maximum 300ma from the host. 577 */ 578 if (max_current >= 800) 579 current_limit = SD_SET_CURRENT_LIMIT_800; 580 else if (max_current >= 600) 581 current_limit = SD_SET_CURRENT_LIMIT_600; 582 else if (max_current >= 400) 583 current_limit = SD_SET_CURRENT_LIMIT_400; 584 else if (max_current >= 200) 585 current_limit = SD_SET_CURRENT_LIMIT_200; 586 587 if (current_limit != SD_SET_CURRENT_NO_CHANGE) { 588 err = mmc_sd_switch(card, 1, 3, current_limit, status); 589 if (err) 590 return err; 591 592 if (((status[15] >> 4) & 0x0F) != current_limit) 593 pr_warning("%s: Problem setting current limit!\n", 594 mmc_hostname(card->host)); 595 596 } 597 598 return 0; 599 } 600 601 /* 602 * UHS-I specific initialization procedure 603 */ 604 static int mmc_sd_init_uhs_card(struct mmc_card *card) 605 { 606 int err; 607 u8 *status; 608 609 if (!card->scr.sda_spec3) 610 return 0; 611 612 if (!(card->csd.cmdclass & CCC_SWITCH)) 613 return 0; 614 615 status = kmalloc(64, GFP_KERNEL); 616 if (!status) { 617 pr_err("%s: could not allocate a buffer for " 618 "switch capabilities.\n", mmc_hostname(card->host)); 619 return -ENOMEM; 620 } 621 622 /* Set 4-bit bus width */ 623 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 624 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 625 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 626 if (err) 627 goto out; 628 629 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 630 } 631 632 /* 633 * Select the bus speed mode depending on host 634 * and card capability. 635 */ 636 sd_update_bus_speed_mode(card); 637 638 /* Set the driver strength for the card */ 639 err = sd_select_driver_type(card, status); 640 if (err) 641 goto out; 642 643 /* Set current limit for the card */ 644 err = sd_set_current_limit(card, status); 645 if (err) 646 goto out; 647 648 /* Set bus speed mode of the card */ 649 err = sd_set_bus_speed_mode(card, status); 650 if (err) 651 goto out; 652 653 /* 654 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 655 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 656 */ 657 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning && 658 (card->sd_bus_speed == UHS_SDR50_BUS_SPEED || 659 card->sd_bus_speed == UHS_SDR104_BUS_SPEED)) { 660 mmc_host_clk_hold(card->host); 661 err = card->host->ops->execute_tuning(card->host, 662 MMC_SEND_TUNING_BLOCK); 663 mmc_host_clk_release(card->host); 664 } 665 666 out: 667 kfree(status); 668 669 return err; 670 } 671 672 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 673 card->raw_cid[2], card->raw_cid[3]); 674 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 675 card->raw_csd[2], card->raw_csd[3]); 676 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 677 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 678 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 679 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 680 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 681 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 682 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 683 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 684 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 685 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 686 687 688 static struct attribute *sd_std_attrs[] = { 689 &dev_attr_cid.attr, 690 &dev_attr_csd.attr, 691 &dev_attr_scr.attr, 692 &dev_attr_date.attr, 693 &dev_attr_erase_size.attr, 694 &dev_attr_preferred_erase_size.attr, 695 &dev_attr_fwrev.attr, 696 &dev_attr_hwrev.attr, 697 &dev_attr_manfid.attr, 698 &dev_attr_name.attr, 699 &dev_attr_oemid.attr, 700 &dev_attr_serial.attr, 701 NULL, 702 }; 703 704 static struct attribute_group sd_std_attr_group = { 705 .attrs = sd_std_attrs, 706 }; 707 708 static const struct attribute_group *sd_attr_groups[] = { 709 &sd_std_attr_group, 710 NULL, 711 }; 712 713 struct device_type sd_type = { 714 .groups = sd_attr_groups, 715 }; 716 717 /* 718 * Fetch CID from card. 719 */ 720 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 721 { 722 int err; 723 u32 max_current; 724 int retries = 10; 725 u32 pocr = ocr; 726 727 try_again: 728 if (!retries) { 729 ocr &= ~SD_OCR_S18R; 730 pr_warning("%s: Skipping voltage switch\n", 731 mmc_hostname(host)); 732 } 733 734 /* 735 * Since we're changing the OCR value, we seem to 736 * need to tell some cards to go back to the idle 737 * state. We wait 1ms to give cards time to 738 * respond. 739 */ 740 mmc_go_idle(host); 741 742 /* 743 * If SD_SEND_IF_COND indicates an SD 2.0 744 * compliant card and we should set bit 30 745 * of the ocr to indicate that we can handle 746 * block-addressed SDHC cards. 747 */ 748 err = mmc_send_if_cond(host, ocr); 749 if (!err) 750 ocr |= SD_OCR_CCS; 751 752 /* 753 * If the host supports one of UHS-I modes, request the card 754 * to switch to 1.8V signaling level. If the card has failed 755 * repeatedly to switch however, skip this. 756 */ 757 if (retries && mmc_host_uhs(host)) 758 ocr |= SD_OCR_S18R; 759 760 /* 761 * If the host can supply more than 150mA at current voltage, 762 * XPC should be set to 1. 763 */ 764 max_current = sd_get_host_max_current(host); 765 if (max_current > 150) 766 ocr |= SD_OCR_XPC; 767 768 err = mmc_send_app_op_cond(host, ocr, rocr); 769 if (err) 770 return err; 771 772 /* 773 * In case CCS and S18A in the response is set, start Signal Voltage 774 * Switch procedure. SPI mode doesn't support CMD11. 775 */ 776 if (!mmc_host_is_spi(host) && rocr && 777 ((*rocr & 0x41000000) == 0x41000000)) { 778 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 779 pocr); 780 if (err == -EAGAIN) { 781 retries--; 782 goto try_again; 783 } else if (err) { 784 retries = 0; 785 goto try_again; 786 } 787 } 788 789 if (mmc_host_is_spi(host)) 790 err = mmc_send_cid(host, cid); 791 else 792 err = mmc_all_send_cid(host, cid); 793 794 return err; 795 } 796 797 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 798 { 799 int err; 800 801 /* 802 * Fetch CSD from card. 803 */ 804 err = mmc_send_csd(card, card->raw_csd); 805 if (err) 806 return err; 807 808 err = mmc_decode_csd(card); 809 if (err) 810 return err; 811 812 return 0; 813 } 814 815 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 816 bool reinit) 817 { 818 int err; 819 820 if (!reinit) { 821 /* 822 * Fetch SCR from card. 823 */ 824 err = mmc_app_send_scr(card, card->raw_scr); 825 if (err) 826 return err; 827 828 err = mmc_decode_scr(card); 829 if (err) 830 return err; 831 832 /* 833 * Fetch and process SD Status register. 834 */ 835 err = mmc_read_ssr(card); 836 if (err) 837 return err; 838 839 /* Erase init depends on CSD and SSR */ 840 mmc_init_erase(card); 841 842 /* 843 * Fetch switch information from card. 844 */ 845 err = mmc_read_switch(card); 846 if (err) 847 return err; 848 } 849 850 /* 851 * For SPI, enable CRC as appropriate. 852 * This CRC enable is located AFTER the reading of the 853 * card registers because some SDHC cards are not able 854 * to provide valid CRCs for non-512-byte blocks. 855 */ 856 if (mmc_host_is_spi(host)) { 857 err = mmc_spi_set_crc(host, use_spi_crc); 858 if (err) 859 return err; 860 } 861 862 /* 863 * Check if read-only switch is active. 864 */ 865 if (!reinit) { 866 int ro = -1; 867 868 if (host->ops->get_ro) { 869 mmc_host_clk_hold(card->host); 870 ro = host->ops->get_ro(host); 871 mmc_host_clk_release(card->host); 872 } 873 874 if (ro < 0) { 875 pr_warning("%s: host does not " 876 "support reading read-only " 877 "switch. assuming write-enable.\n", 878 mmc_hostname(host)); 879 } else if (ro > 0) { 880 mmc_card_set_readonly(card); 881 } 882 } 883 884 return 0; 885 } 886 887 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 888 { 889 unsigned max_dtr = (unsigned int)-1; 890 891 if (mmc_card_highspeed(card)) { 892 if (max_dtr > card->sw_caps.hs_max_dtr) 893 max_dtr = card->sw_caps.hs_max_dtr; 894 } else if (max_dtr > card->csd.max_dtr) { 895 max_dtr = card->csd.max_dtr; 896 } 897 898 return max_dtr; 899 } 900 901 void mmc_sd_go_highspeed(struct mmc_card *card) 902 { 903 mmc_card_set_highspeed(card); 904 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 905 } 906 907 /* 908 * Handle the detection and initialisation of a card. 909 * 910 * In the case of a resume, "oldcard" will contain the card 911 * we're trying to reinitialise. 912 */ 913 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 914 struct mmc_card *oldcard) 915 { 916 struct mmc_card *card; 917 int err; 918 u32 cid[4]; 919 u32 rocr = 0; 920 921 BUG_ON(!host); 922 WARN_ON(!host->claimed); 923 924 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 925 if (err) 926 return err; 927 928 if (oldcard) { 929 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 930 return -ENOENT; 931 932 card = oldcard; 933 } else { 934 /* 935 * Allocate card structure. 936 */ 937 card = mmc_alloc_card(host, &sd_type); 938 if (IS_ERR(card)) 939 return PTR_ERR(card); 940 941 card->ocr = ocr; 942 card->type = MMC_TYPE_SD; 943 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 944 } 945 946 /* 947 * For native busses: get card RCA and quit open drain mode. 948 */ 949 if (!mmc_host_is_spi(host)) { 950 err = mmc_send_relative_addr(host, &card->rca); 951 if (err) 952 goto free_card; 953 } 954 955 if (!oldcard) { 956 err = mmc_sd_get_csd(host, card); 957 if (err) 958 goto free_card; 959 960 mmc_decode_cid(card); 961 } 962 963 /* 964 * Select card, as all following commands rely on that. 965 */ 966 if (!mmc_host_is_spi(host)) { 967 err = mmc_select_card(card); 968 if (err) 969 goto free_card; 970 } 971 972 err = mmc_sd_setup_card(host, card, oldcard != NULL); 973 if (err) 974 goto free_card; 975 976 /* Initialization sequence for UHS-I cards */ 977 if (rocr & SD_ROCR_S18A) { 978 err = mmc_sd_init_uhs_card(card); 979 if (err) 980 goto free_card; 981 982 /* Card is an ultra-high-speed card */ 983 mmc_card_set_uhs(card); 984 } else { 985 /* 986 * Attempt to change to high-speed (if supported) 987 */ 988 err = mmc_sd_switch_hs(card); 989 if (err > 0) 990 mmc_sd_go_highspeed(card); 991 else if (err) 992 goto free_card; 993 994 /* 995 * Set bus speed. 996 */ 997 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 998 999 /* 1000 * Switch to wider bus (if supported). 1001 */ 1002 if ((host->caps & MMC_CAP_4_BIT_DATA) && 1003 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 1004 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 1005 if (err) 1006 goto free_card; 1007 1008 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1009 } 1010 } 1011 1012 host->card = card; 1013 return 0; 1014 1015 free_card: 1016 if (!oldcard) 1017 mmc_remove_card(card); 1018 1019 return err; 1020 } 1021 1022 /* 1023 * Host is being removed. Free up the current card. 1024 */ 1025 static void mmc_sd_remove(struct mmc_host *host) 1026 { 1027 BUG_ON(!host); 1028 BUG_ON(!host->card); 1029 1030 mmc_remove_card(host->card); 1031 host->card = NULL; 1032 } 1033 1034 /* 1035 * Card detection - card is alive. 1036 */ 1037 static int mmc_sd_alive(struct mmc_host *host) 1038 { 1039 return mmc_send_status(host->card, NULL); 1040 } 1041 1042 /* 1043 * Card detection callback from host. 1044 */ 1045 static void mmc_sd_detect(struct mmc_host *host) 1046 { 1047 int err; 1048 1049 BUG_ON(!host); 1050 BUG_ON(!host->card); 1051 1052 mmc_get_card(host->card); 1053 1054 /* 1055 * Just check if our card has been removed. 1056 */ 1057 err = _mmc_detect_card_removed(host); 1058 1059 mmc_put_card(host->card); 1060 1061 if (err) { 1062 mmc_sd_remove(host); 1063 1064 mmc_claim_host(host); 1065 mmc_detach_bus(host); 1066 mmc_power_off(host); 1067 mmc_release_host(host); 1068 } 1069 } 1070 1071 static int _mmc_sd_suspend(struct mmc_host *host) 1072 { 1073 int err = 0; 1074 1075 BUG_ON(!host); 1076 BUG_ON(!host->card); 1077 1078 mmc_claim_host(host); 1079 1080 if (mmc_card_suspended(host->card)) 1081 goto out; 1082 1083 if (!mmc_host_is_spi(host)) 1084 err = mmc_deselect_cards(host); 1085 host->card->state &= ~MMC_STATE_HIGHSPEED; 1086 if (!err) { 1087 mmc_power_off(host); 1088 mmc_card_set_suspended(host->card); 1089 } 1090 1091 out: 1092 mmc_release_host(host); 1093 return err; 1094 } 1095 1096 /* 1097 * Callback for suspend 1098 */ 1099 static int mmc_sd_suspend(struct mmc_host *host) 1100 { 1101 int err; 1102 1103 err = _mmc_sd_suspend(host); 1104 if (!err) { 1105 pm_runtime_disable(&host->card->dev); 1106 pm_runtime_set_suspended(&host->card->dev); 1107 } 1108 1109 return err; 1110 } 1111 1112 /* 1113 * This function tries to determine if the same card is still present 1114 * and, if so, restore all state to it. 1115 */ 1116 static int _mmc_sd_resume(struct mmc_host *host) 1117 { 1118 int err = 0; 1119 1120 BUG_ON(!host); 1121 BUG_ON(!host->card); 1122 1123 mmc_claim_host(host); 1124 1125 if (!mmc_card_suspended(host->card)) 1126 goto out; 1127 1128 mmc_power_up(host, host->card->ocr); 1129 err = mmc_sd_init_card(host, host->card->ocr, host->card); 1130 mmc_card_clr_suspended(host->card); 1131 1132 out: 1133 mmc_release_host(host); 1134 return err; 1135 } 1136 1137 /* 1138 * Callback for resume 1139 */ 1140 static int mmc_sd_resume(struct mmc_host *host) 1141 { 1142 int err = 0; 1143 1144 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) { 1145 err = _mmc_sd_resume(host); 1146 pm_runtime_set_active(&host->card->dev); 1147 pm_runtime_mark_last_busy(&host->card->dev); 1148 } 1149 pm_runtime_enable(&host->card->dev); 1150 1151 return err; 1152 } 1153 1154 /* 1155 * Callback for runtime_suspend. 1156 */ 1157 static int mmc_sd_runtime_suspend(struct mmc_host *host) 1158 { 1159 int err; 1160 1161 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) 1162 return 0; 1163 1164 err = _mmc_sd_suspend(host); 1165 if (err) 1166 pr_err("%s: error %d doing aggessive suspend\n", 1167 mmc_hostname(host), err); 1168 1169 return err; 1170 } 1171 1172 /* 1173 * Callback for runtime_resume. 1174 */ 1175 static int mmc_sd_runtime_resume(struct mmc_host *host) 1176 { 1177 int err; 1178 1179 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME))) 1180 return 0; 1181 1182 err = _mmc_sd_resume(host); 1183 if (err) 1184 pr_err("%s: error %d doing aggessive resume\n", 1185 mmc_hostname(host), err); 1186 1187 return 0; 1188 } 1189 1190 static int mmc_sd_power_restore(struct mmc_host *host) 1191 { 1192 int ret; 1193 1194 host->card->state &= ~MMC_STATE_HIGHSPEED; 1195 mmc_claim_host(host); 1196 ret = mmc_sd_init_card(host, host->card->ocr, host->card); 1197 mmc_release_host(host); 1198 1199 return ret; 1200 } 1201 1202 static const struct mmc_bus_ops mmc_sd_ops = { 1203 .remove = mmc_sd_remove, 1204 .detect = mmc_sd_detect, 1205 .suspend = NULL, 1206 .resume = NULL, 1207 .power_restore = mmc_sd_power_restore, 1208 .alive = mmc_sd_alive, 1209 .shutdown = mmc_sd_suspend, 1210 }; 1211 1212 static const struct mmc_bus_ops mmc_sd_ops_unsafe = { 1213 .remove = mmc_sd_remove, 1214 .detect = mmc_sd_detect, 1215 .runtime_suspend = mmc_sd_runtime_suspend, 1216 .runtime_resume = mmc_sd_runtime_resume, 1217 .suspend = mmc_sd_suspend, 1218 .resume = mmc_sd_resume, 1219 .power_restore = mmc_sd_power_restore, 1220 .alive = mmc_sd_alive, 1221 .shutdown = mmc_sd_suspend, 1222 }; 1223 1224 static void mmc_sd_attach_bus_ops(struct mmc_host *host) 1225 { 1226 const struct mmc_bus_ops *bus_ops; 1227 1228 if (!mmc_card_is_removable(host)) 1229 bus_ops = &mmc_sd_ops_unsafe; 1230 else 1231 bus_ops = &mmc_sd_ops; 1232 mmc_attach_bus(host, bus_ops); 1233 } 1234 1235 /* 1236 * Starting point for SD card init. 1237 */ 1238 int mmc_attach_sd(struct mmc_host *host) 1239 { 1240 int err; 1241 u32 ocr, rocr; 1242 1243 BUG_ON(!host); 1244 WARN_ON(!host->claimed); 1245 1246 err = mmc_send_app_op_cond(host, 0, &ocr); 1247 if (err) 1248 return err; 1249 1250 mmc_sd_attach_bus_ops(host); 1251 if (host->ocr_avail_sd) 1252 host->ocr_avail = host->ocr_avail_sd; 1253 1254 /* 1255 * We need to get OCR a different way for SPI. 1256 */ 1257 if (mmc_host_is_spi(host)) { 1258 mmc_go_idle(host); 1259 1260 err = mmc_spi_read_ocr(host, 0, &ocr); 1261 if (err) 1262 goto err; 1263 } 1264 1265 rocr = mmc_select_voltage(host, ocr); 1266 1267 /* 1268 * Can we support the voltage(s) of the card(s)? 1269 */ 1270 if (!rocr) { 1271 err = -EINVAL; 1272 goto err; 1273 } 1274 1275 /* 1276 * Detect and init the card. 1277 */ 1278 err = mmc_sd_init_card(host, rocr, NULL); 1279 if (err) 1280 goto err; 1281 1282 mmc_release_host(host); 1283 err = mmc_add_card(host->card); 1284 mmc_claim_host(host); 1285 if (err) 1286 goto remove_card; 1287 1288 return 0; 1289 1290 remove_card: 1291 mmc_release_host(host); 1292 mmc_remove_card(host->card); 1293 host->card = NULL; 1294 mmc_claim_host(host); 1295 err: 1296 mmc_detach_bus(host); 1297 1298 pr_err("%s: error %d whilst initialising SD card\n", 1299 mmc_hostname(host), err); 1300 1301 return err; 1302 } 1303 1304