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 } 333 334 out: 335 kfree(status); 336 337 return err; 338 } 339 340 /* 341 * Test if the card supports high-speed mode and, if so, switch to it. 342 */ 343 int mmc_sd_switch_hs(struct mmc_card *card) 344 { 345 int err; 346 u8 *status; 347 348 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 349 return 0; 350 351 if (!(card->csd.cmdclass & CCC_SWITCH)) 352 return 0; 353 354 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 355 return 0; 356 357 if (card->sw_caps.hs_max_dtr == 0) 358 return 0; 359 360 err = -EIO; 361 362 status = kmalloc(64, GFP_KERNEL); 363 if (!status) { 364 pr_err("%s: could not allocate a buffer for " 365 "switch capabilities.\n", mmc_hostname(card->host)); 366 return -ENOMEM; 367 } 368 369 err = mmc_sd_switch(card, 1, 0, 1, status); 370 if (err) 371 goto out; 372 373 if ((status[16] & 0xF) != 1) { 374 pr_warn("%s: Problem switching card into high-speed mode!\n", 375 mmc_hostname(card->host)); 376 err = 0; 377 } else { 378 err = 1; 379 } 380 381 out: 382 kfree(status); 383 384 return err; 385 } 386 387 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 388 { 389 int host_drv_type = SD_DRIVER_TYPE_B; 390 int card_drv_type = SD_DRIVER_TYPE_B; 391 int drive_strength; 392 int err; 393 394 /* 395 * If the host doesn't support any of the Driver Types A,C or D, 396 * or there is no board specific handler then default Driver 397 * Type B is used. 398 */ 399 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C 400 | MMC_CAP_DRIVER_TYPE_D))) 401 return 0; 402 403 if (!card->host->ops->select_drive_strength) 404 return 0; 405 406 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) 407 host_drv_type |= SD_DRIVER_TYPE_A; 408 409 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) 410 host_drv_type |= SD_DRIVER_TYPE_C; 411 412 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) 413 host_drv_type |= SD_DRIVER_TYPE_D; 414 415 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) 416 card_drv_type |= SD_DRIVER_TYPE_A; 417 418 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 419 card_drv_type |= SD_DRIVER_TYPE_C; 420 421 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D) 422 card_drv_type |= SD_DRIVER_TYPE_D; 423 424 /* 425 * The drive strength that the hardware can support 426 * depends on the board design. Pass the appropriate 427 * information and let the hardware specific code 428 * return what is possible given the options 429 */ 430 mmc_host_clk_hold(card->host); 431 drive_strength = card->host->ops->select_drive_strength( 432 card->sw_caps.uhs_max_dtr, 433 host_drv_type, card_drv_type); 434 mmc_host_clk_release(card->host); 435 436 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 437 if (err) 438 return err; 439 440 if ((status[15] & 0xF) != drive_strength) { 441 pr_warn("%s: Problem setting drive strength!\n", 442 mmc_hostname(card->host)); 443 return 0; 444 } 445 446 mmc_set_driver_type(card->host, drive_strength); 447 448 return 0; 449 } 450 451 static void sd_update_bus_speed_mode(struct mmc_card *card) 452 { 453 /* 454 * If the host doesn't support any of the UHS-I modes, fallback on 455 * default speed. 456 */ 457 if (!mmc_host_uhs(card->host)) { 458 card->sd_bus_speed = 0; 459 return; 460 } 461 462 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 463 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 464 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 465 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 466 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 467 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 468 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 469 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 470 SD_MODE_UHS_SDR50)) { 471 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 472 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 473 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 474 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 475 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 476 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 477 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 478 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 479 SD_MODE_UHS_SDR12)) { 480 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 481 } 482 } 483 484 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 485 { 486 int err; 487 unsigned int timing = 0; 488 489 switch (card->sd_bus_speed) { 490 case UHS_SDR104_BUS_SPEED: 491 timing = MMC_TIMING_UHS_SDR104; 492 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 493 break; 494 case UHS_DDR50_BUS_SPEED: 495 timing = MMC_TIMING_UHS_DDR50; 496 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 497 break; 498 case UHS_SDR50_BUS_SPEED: 499 timing = MMC_TIMING_UHS_SDR50; 500 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 501 break; 502 case UHS_SDR25_BUS_SPEED: 503 timing = MMC_TIMING_UHS_SDR25; 504 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 505 break; 506 case UHS_SDR12_BUS_SPEED: 507 timing = MMC_TIMING_UHS_SDR12; 508 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 509 break; 510 default: 511 return 0; 512 } 513 514 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 515 if (err) 516 return err; 517 518 if ((status[16] & 0xF) != card->sd_bus_speed) 519 pr_warn("%s: Problem setting bus speed mode!\n", 520 mmc_hostname(card->host)); 521 else { 522 mmc_set_timing(card->host, timing); 523 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 524 } 525 526 return 0; 527 } 528 529 /* Get host's max current setting at its current voltage */ 530 static u32 sd_get_host_max_current(struct mmc_host *host) 531 { 532 u32 voltage, max_current; 533 534 voltage = 1 << host->ios.vdd; 535 switch (voltage) { 536 case MMC_VDD_165_195: 537 max_current = host->max_current_180; 538 break; 539 case MMC_VDD_29_30: 540 case MMC_VDD_30_31: 541 max_current = host->max_current_300; 542 break; 543 case MMC_VDD_32_33: 544 case MMC_VDD_33_34: 545 max_current = host->max_current_330; 546 break; 547 default: 548 max_current = 0; 549 } 550 551 return max_current; 552 } 553 554 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 555 { 556 int current_limit = SD_SET_CURRENT_NO_CHANGE; 557 int err; 558 u32 max_current; 559 560 /* 561 * Current limit switch is only defined for SDR50, SDR104, and DDR50 562 * bus speed modes. For other bus speed modes, we do not change the 563 * current limit. 564 */ 565 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && 566 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && 567 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) 568 return 0; 569 570 /* 571 * Host has different current capabilities when operating at 572 * different voltages, so find out its max current first. 573 */ 574 max_current = sd_get_host_max_current(card->host); 575 576 /* 577 * We only check host's capability here, if we set a limit that is 578 * higher than the card's maximum current, the card will be using its 579 * maximum current, e.g. if the card's maximum current is 300ma, and 580 * when we set current limit to 200ma, the card will draw 200ma, and 581 * when we set current limit to 400/600/800ma, the card will draw its 582 * maximum 300ma from the host. 583 */ 584 if (max_current >= 800) 585 current_limit = SD_SET_CURRENT_LIMIT_800; 586 else if (max_current >= 600) 587 current_limit = SD_SET_CURRENT_LIMIT_600; 588 else if (max_current >= 400) 589 current_limit = SD_SET_CURRENT_LIMIT_400; 590 else if (max_current >= 200) 591 current_limit = SD_SET_CURRENT_LIMIT_200; 592 593 if (current_limit != SD_SET_CURRENT_NO_CHANGE) { 594 err = mmc_sd_switch(card, 1, 3, current_limit, status); 595 if (err) 596 return err; 597 598 if (((status[15] >> 4) & 0x0F) != current_limit) 599 pr_warn("%s: Problem setting current limit!\n", 600 mmc_hostname(card->host)); 601 602 } 603 604 return 0; 605 } 606 607 /* 608 * UHS-I specific initialization procedure 609 */ 610 static int mmc_sd_init_uhs_card(struct mmc_card *card) 611 { 612 int err; 613 u8 *status; 614 615 if (!card->scr.sda_spec3) 616 return 0; 617 618 if (!(card->csd.cmdclass & CCC_SWITCH)) 619 return 0; 620 621 status = kmalloc(64, GFP_KERNEL); 622 if (!status) { 623 pr_err("%s: could not allocate a buffer for " 624 "switch capabilities.\n", mmc_hostname(card->host)); 625 return -ENOMEM; 626 } 627 628 /* Set 4-bit bus width */ 629 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 630 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 631 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 632 if (err) 633 goto out; 634 635 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 636 } 637 638 /* 639 * Select the bus speed mode depending on host 640 * and card capability. 641 */ 642 sd_update_bus_speed_mode(card); 643 644 /* Set the driver strength for the card */ 645 err = sd_select_driver_type(card, status); 646 if (err) 647 goto out; 648 649 /* Set current limit for the card */ 650 err = sd_set_current_limit(card, status); 651 if (err) 652 goto out; 653 654 /* Set bus speed mode of the card */ 655 err = sd_set_bus_speed_mode(card, status); 656 if (err) 657 goto out; 658 659 /* 660 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 661 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 662 */ 663 if (!mmc_host_is_spi(card->host) && 664 (card->sd_bus_speed == UHS_SDR50_BUS_SPEED || 665 card->sd_bus_speed == UHS_SDR104_BUS_SPEED)) 666 err = mmc_execute_tuning(card); 667 out: 668 kfree(status); 669 670 return err; 671 } 672 673 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 674 card->raw_cid[2], card->raw_cid[3]); 675 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 676 card->raw_csd[2], card->raw_csd[3]); 677 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 678 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 679 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 680 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 681 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 682 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 683 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 684 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 685 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 686 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 687 688 689 static struct attribute *sd_std_attrs[] = { 690 &dev_attr_cid.attr, 691 &dev_attr_csd.attr, 692 &dev_attr_scr.attr, 693 &dev_attr_date.attr, 694 &dev_attr_erase_size.attr, 695 &dev_attr_preferred_erase_size.attr, 696 &dev_attr_fwrev.attr, 697 &dev_attr_hwrev.attr, 698 &dev_attr_manfid.attr, 699 &dev_attr_name.attr, 700 &dev_attr_oemid.attr, 701 &dev_attr_serial.attr, 702 NULL, 703 }; 704 ATTRIBUTE_GROUPS(sd_std); 705 706 struct device_type sd_type = { 707 .groups = sd_std_groups, 708 }; 709 710 /* 711 * Fetch CID from card. 712 */ 713 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 714 { 715 int err; 716 u32 max_current; 717 int retries = 10; 718 u32 pocr = ocr; 719 720 try_again: 721 if (!retries) { 722 ocr &= ~SD_OCR_S18R; 723 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 724 } 725 726 /* 727 * Since we're changing the OCR value, we seem to 728 * need to tell some cards to go back to the idle 729 * state. We wait 1ms to give cards time to 730 * respond. 731 */ 732 mmc_go_idle(host); 733 734 /* 735 * If SD_SEND_IF_COND indicates an SD 2.0 736 * compliant card and we should set bit 30 737 * of the ocr to indicate that we can handle 738 * block-addressed SDHC cards. 739 */ 740 err = mmc_send_if_cond(host, ocr); 741 if (!err) 742 ocr |= SD_OCR_CCS; 743 744 /* 745 * If the host supports one of UHS-I modes, request the card 746 * to switch to 1.8V signaling level. If the card has failed 747 * repeatedly to switch however, skip this. 748 */ 749 if (retries && mmc_host_uhs(host)) 750 ocr |= SD_OCR_S18R; 751 752 /* 753 * If the host can supply more than 150mA at current voltage, 754 * XPC should be set to 1. 755 */ 756 max_current = sd_get_host_max_current(host); 757 if (max_current > 150) 758 ocr |= SD_OCR_XPC; 759 760 err = mmc_send_app_op_cond(host, ocr, rocr); 761 if (err) 762 return err; 763 764 /* 765 * In case CCS and S18A in the response is set, start Signal Voltage 766 * Switch procedure. SPI mode doesn't support CMD11. 767 */ 768 if (!mmc_host_is_spi(host) && rocr && 769 ((*rocr & 0x41000000) == 0x41000000)) { 770 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 771 pocr); 772 if (err == -EAGAIN) { 773 retries--; 774 goto try_again; 775 } else if (err) { 776 retries = 0; 777 goto try_again; 778 } 779 } 780 781 if (mmc_host_is_spi(host)) 782 err = mmc_send_cid(host, cid); 783 else 784 err = mmc_all_send_cid(host, cid); 785 786 return err; 787 } 788 789 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 790 { 791 int err; 792 793 /* 794 * Fetch CSD from card. 795 */ 796 err = mmc_send_csd(card, card->raw_csd); 797 if (err) 798 return err; 799 800 err = mmc_decode_csd(card); 801 if (err) 802 return err; 803 804 return 0; 805 } 806 807 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 808 bool reinit) 809 { 810 int err; 811 812 if (!reinit) { 813 /* 814 * Fetch SCR from card. 815 */ 816 err = mmc_app_send_scr(card, card->raw_scr); 817 if (err) 818 return err; 819 820 err = mmc_decode_scr(card); 821 if (err) 822 return err; 823 824 /* 825 * Fetch and process SD Status register. 826 */ 827 err = mmc_read_ssr(card); 828 if (err) 829 return err; 830 831 /* Erase init depends on CSD and SSR */ 832 mmc_init_erase(card); 833 834 /* 835 * Fetch switch information from card. 836 */ 837 err = mmc_read_switch(card); 838 if (err) 839 return err; 840 } 841 842 /* 843 * For SPI, enable CRC as appropriate. 844 * This CRC enable is located AFTER the reading of the 845 * card registers because some SDHC cards are not able 846 * to provide valid CRCs for non-512-byte blocks. 847 */ 848 if (mmc_host_is_spi(host)) { 849 err = mmc_spi_set_crc(host, use_spi_crc); 850 if (err) 851 return err; 852 } 853 854 /* 855 * Check if read-only switch is active. 856 */ 857 if (!reinit) { 858 int ro = -1; 859 860 if (host->ops->get_ro) { 861 mmc_host_clk_hold(card->host); 862 ro = host->ops->get_ro(host); 863 mmc_host_clk_release(card->host); 864 } 865 866 if (ro < 0) { 867 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n", 868 mmc_hostname(host)); 869 } else if (ro > 0) { 870 mmc_card_set_readonly(card); 871 } 872 } 873 874 return 0; 875 } 876 877 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 878 { 879 unsigned max_dtr = (unsigned int)-1; 880 881 if (mmc_card_hs(card)) { 882 if (max_dtr > card->sw_caps.hs_max_dtr) 883 max_dtr = card->sw_caps.hs_max_dtr; 884 } else if (max_dtr > card->csd.max_dtr) { 885 max_dtr = card->csd.max_dtr; 886 } 887 888 return max_dtr; 889 } 890 891 /* 892 * Handle the detection and initialisation of a card. 893 * 894 * In the case of a resume, "oldcard" will contain the card 895 * we're trying to reinitialise. 896 */ 897 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 898 struct mmc_card *oldcard) 899 { 900 struct mmc_card *card; 901 int err; 902 u32 cid[4]; 903 u32 rocr = 0; 904 905 BUG_ON(!host); 906 WARN_ON(!host->claimed); 907 908 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 909 if (err) 910 return err; 911 912 if (oldcard) { 913 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 914 return -ENOENT; 915 916 card = oldcard; 917 } else { 918 /* 919 * Allocate card structure. 920 */ 921 card = mmc_alloc_card(host, &sd_type); 922 if (IS_ERR(card)) 923 return PTR_ERR(card); 924 925 card->ocr = ocr; 926 card->type = MMC_TYPE_SD; 927 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 928 } 929 930 /* 931 * Call the optional HC's init_card function to handle quirks. 932 */ 933 if (host->ops->init_card) 934 host->ops->init_card(host, card); 935 936 /* 937 * For native busses: get card RCA and quit open drain mode. 938 */ 939 if (!mmc_host_is_spi(host)) { 940 err = mmc_send_relative_addr(host, &card->rca); 941 if (err) 942 goto free_card; 943 } 944 945 if (!oldcard) { 946 err = mmc_sd_get_csd(host, card); 947 if (err) 948 goto free_card; 949 950 mmc_decode_cid(card); 951 } 952 953 /* 954 * handling only for cards supporting DSR and hosts requesting 955 * DSR configuration 956 */ 957 if (card->csd.dsr_imp && host->dsr_req) 958 mmc_set_dsr(host); 959 960 /* 961 * Select card, as all following commands rely on that. 962 */ 963 if (!mmc_host_is_spi(host)) { 964 err = mmc_select_card(card); 965 if (err) 966 goto free_card; 967 } 968 969 err = mmc_sd_setup_card(host, card, oldcard != NULL); 970 if (err) 971 goto free_card; 972 973 /* Initialization sequence for UHS-I cards */ 974 if (rocr & SD_ROCR_S18A) { 975 err = mmc_sd_init_uhs_card(card); 976 if (err) 977 goto free_card; 978 } else { 979 /* 980 * Attempt to change to high-speed (if supported) 981 */ 982 err = mmc_sd_switch_hs(card); 983 if (err > 0) 984 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 985 else if (err) 986 goto free_card; 987 988 /* 989 * Set bus speed. 990 */ 991 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 992 993 /* 994 * Switch to wider bus (if supported). 995 */ 996 if ((host->caps & MMC_CAP_4_BIT_DATA) && 997 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 998 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 999 if (err) 1000 goto free_card; 1001 1002 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1003 } 1004 } 1005 1006 host->card = card; 1007 return 0; 1008 1009 free_card: 1010 if (!oldcard) 1011 mmc_remove_card(card); 1012 1013 return err; 1014 } 1015 1016 /* 1017 * Host is being removed. Free up the current card. 1018 */ 1019 static void mmc_sd_remove(struct mmc_host *host) 1020 { 1021 BUG_ON(!host); 1022 BUG_ON(!host->card); 1023 1024 mmc_remove_card(host->card); 1025 host->card = NULL; 1026 } 1027 1028 /* 1029 * Card detection - card is alive. 1030 */ 1031 static int mmc_sd_alive(struct mmc_host *host) 1032 { 1033 return mmc_send_status(host->card, NULL); 1034 } 1035 1036 /* 1037 * Card detection callback from host. 1038 */ 1039 static void mmc_sd_detect(struct mmc_host *host) 1040 { 1041 int err; 1042 1043 BUG_ON(!host); 1044 BUG_ON(!host->card); 1045 1046 mmc_get_card(host->card); 1047 1048 /* 1049 * Just check if our card has been removed. 1050 */ 1051 err = _mmc_detect_card_removed(host); 1052 1053 mmc_put_card(host->card); 1054 1055 if (err) { 1056 mmc_sd_remove(host); 1057 1058 mmc_claim_host(host); 1059 mmc_detach_bus(host); 1060 mmc_power_off(host); 1061 mmc_release_host(host); 1062 } 1063 } 1064 1065 static int _mmc_sd_suspend(struct mmc_host *host) 1066 { 1067 int err = 0; 1068 1069 BUG_ON(!host); 1070 BUG_ON(!host->card); 1071 1072 mmc_claim_host(host); 1073 1074 if (mmc_card_suspended(host->card)) 1075 goto out; 1076 1077 if (!mmc_host_is_spi(host)) 1078 err = mmc_deselect_cards(host); 1079 1080 if (!err) { 1081 mmc_power_off(host); 1082 mmc_card_set_suspended(host->card); 1083 } 1084 1085 out: 1086 mmc_release_host(host); 1087 return err; 1088 } 1089 1090 /* 1091 * Callback for suspend 1092 */ 1093 static int mmc_sd_suspend(struct mmc_host *host) 1094 { 1095 int err; 1096 1097 err = _mmc_sd_suspend(host); 1098 if (!err) { 1099 pm_runtime_disable(&host->card->dev); 1100 pm_runtime_set_suspended(&host->card->dev); 1101 } 1102 1103 return err; 1104 } 1105 1106 /* 1107 * This function tries to determine if the same card is still present 1108 * and, if so, restore all state to it. 1109 */ 1110 static int _mmc_sd_resume(struct mmc_host *host) 1111 { 1112 int err = 0; 1113 1114 BUG_ON(!host); 1115 BUG_ON(!host->card); 1116 1117 mmc_claim_host(host); 1118 1119 if (!mmc_card_suspended(host->card)) 1120 goto out; 1121 1122 mmc_power_up(host, host->card->ocr); 1123 err = mmc_sd_init_card(host, host->card->ocr, host->card); 1124 mmc_card_clr_suspended(host->card); 1125 1126 out: 1127 mmc_release_host(host); 1128 return err; 1129 } 1130 1131 /* 1132 * Callback for resume 1133 */ 1134 static int mmc_sd_resume(struct mmc_host *host) 1135 { 1136 int err = 0; 1137 1138 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) { 1139 err = _mmc_sd_resume(host); 1140 pm_runtime_set_active(&host->card->dev); 1141 pm_runtime_mark_last_busy(&host->card->dev); 1142 } 1143 pm_runtime_enable(&host->card->dev); 1144 1145 return err; 1146 } 1147 1148 /* 1149 * Callback for runtime_suspend. 1150 */ 1151 static int mmc_sd_runtime_suspend(struct mmc_host *host) 1152 { 1153 int err; 1154 1155 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) 1156 return 0; 1157 1158 err = _mmc_sd_suspend(host); 1159 if (err) 1160 pr_err("%s: error %d doing aggessive suspend\n", 1161 mmc_hostname(host), err); 1162 1163 return err; 1164 } 1165 1166 /* 1167 * Callback for runtime_resume. 1168 */ 1169 static int mmc_sd_runtime_resume(struct mmc_host *host) 1170 { 1171 int err; 1172 1173 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME))) 1174 return 0; 1175 1176 err = _mmc_sd_resume(host); 1177 if (err) 1178 pr_err("%s: error %d doing aggessive resume\n", 1179 mmc_hostname(host), err); 1180 1181 return 0; 1182 } 1183 1184 static int mmc_sd_power_restore(struct mmc_host *host) 1185 { 1186 int ret; 1187 1188 mmc_claim_host(host); 1189 ret = mmc_sd_init_card(host, host->card->ocr, host->card); 1190 mmc_release_host(host); 1191 1192 return ret; 1193 } 1194 1195 static int mmc_sd_reset(struct mmc_host *host) 1196 { 1197 mmc_power_cycle(host, host->card->ocr); 1198 return mmc_sd_power_restore(host); 1199 } 1200 1201 static const struct mmc_bus_ops mmc_sd_ops = { 1202 .remove = mmc_sd_remove, 1203 .detect = mmc_sd_detect, 1204 .runtime_suspend = mmc_sd_runtime_suspend, 1205 .runtime_resume = mmc_sd_runtime_resume, 1206 .suspend = mmc_sd_suspend, 1207 .resume = mmc_sd_resume, 1208 .power_restore = mmc_sd_power_restore, 1209 .alive = mmc_sd_alive, 1210 .shutdown = mmc_sd_suspend, 1211 .reset = mmc_sd_reset, 1212 }; 1213 1214 /* 1215 * Starting point for SD card init. 1216 */ 1217 int mmc_attach_sd(struct mmc_host *host) 1218 { 1219 int err; 1220 u32 ocr, rocr; 1221 1222 BUG_ON(!host); 1223 WARN_ON(!host->claimed); 1224 1225 err = mmc_send_app_op_cond(host, 0, &ocr); 1226 if (err) 1227 return err; 1228 1229 mmc_attach_bus(host, &mmc_sd_ops); 1230 if (host->ocr_avail_sd) 1231 host->ocr_avail = host->ocr_avail_sd; 1232 1233 /* 1234 * We need to get OCR a different way for SPI. 1235 */ 1236 if (mmc_host_is_spi(host)) { 1237 mmc_go_idle(host); 1238 1239 err = mmc_spi_read_ocr(host, 0, &ocr); 1240 if (err) 1241 goto err; 1242 } 1243 1244 rocr = mmc_select_voltage(host, ocr); 1245 1246 /* 1247 * Can we support the voltage(s) of the card(s)? 1248 */ 1249 if (!rocr) { 1250 err = -EINVAL; 1251 goto err; 1252 } 1253 1254 /* 1255 * Detect and init the card. 1256 */ 1257 err = mmc_sd_init_card(host, rocr, NULL); 1258 if (err) 1259 goto err; 1260 1261 mmc_release_host(host); 1262 err = mmc_add_card(host->card); 1263 mmc_claim_host(host); 1264 if (err) 1265 goto remove_card; 1266 1267 return 0; 1268 1269 remove_card: 1270 mmc_release_host(host); 1271 mmc_remove_card(host->card); 1272 host->card = NULL; 1273 mmc_claim_host(host); 1274 err: 1275 mmc_detach_bus(host); 1276 1277 pr_err("%s: error %d whilst initialising SD card\n", 1278 mmc_hostname(host), err); 1279 1280 return err; 1281 } 1282