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 17 #include <linux/mmc/host.h> 18 #include <linux/mmc/card.h> 19 #include <linux/mmc/mmc.h> 20 #include <linux/mmc/sd.h> 21 22 #include "core.h" 23 #include "bus.h" 24 #include "mmc_ops.h" 25 #include "sd.h" 26 #include "sd_ops.h" 27 28 static const unsigned int tran_exp[] = { 29 10000, 100000, 1000000, 10000000, 30 0, 0, 0, 0 31 }; 32 33 static const unsigned char tran_mant[] = { 34 0, 10, 12, 13, 15, 20, 25, 30, 35 35, 40, 45, 50, 55, 60, 70, 80, 36 }; 37 38 static const unsigned int tacc_exp[] = { 39 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 40 }; 41 42 static const unsigned int tacc_mant[] = { 43 0, 10, 12, 13, 15, 20, 25, 30, 44 35, 40, 45, 50, 55, 60, 70, 80, 45 }; 46 47 #define UNSTUFF_BITS(resp,start,size) \ 48 ({ \ 49 const int __size = size; \ 50 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 51 const int __off = 3 - ((start) / 32); \ 52 const int __shft = (start) & 31; \ 53 u32 __res; \ 54 \ 55 __res = resp[__off] >> __shft; \ 56 if (__size + __shft > 32) \ 57 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 58 __res & __mask; \ 59 }) 60 61 /* 62 * Given the decoded CSD structure, decode the raw CID to our CID structure. 63 */ 64 void mmc_decode_cid(struct mmc_card *card) 65 { 66 u32 *resp = card->raw_cid; 67 68 memset(&card->cid, 0, sizeof(struct mmc_cid)); 69 70 /* 71 * SD doesn't currently have a version field so we will 72 * have to assume we can parse this. 73 */ 74 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 75 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 76 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 77 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 78 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 79 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 80 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 81 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); 82 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); 83 card->cid.serial = UNSTUFF_BITS(resp, 24, 32); 84 card->cid.year = UNSTUFF_BITS(resp, 12, 8); 85 card->cid.month = UNSTUFF_BITS(resp, 8, 4); 86 87 card->cid.year += 2000; /* SD cards year offset */ 88 } 89 90 /* 91 * Given a 128-bit response, decode to our card CSD structure. 92 */ 93 static int mmc_decode_csd(struct mmc_card *card) 94 { 95 struct mmc_csd *csd = &card->csd; 96 unsigned int e, m, csd_struct; 97 u32 *resp = card->raw_csd; 98 99 csd_struct = UNSTUFF_BITS(resp, 126, 2); 100 101 switch (csd_struct) { 102 case 0: 103 m = UNSTUFF_BITS(resp, 115, 4); 104 e = UNSTUFF_BITS(resp, 112, 3); 105 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 106 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 107 108 m = UNSTUFF_BITS(resp, 99, 4); 109 e = UNSTUFF_BITS(resp, 96, 3); 110 csd->max_dtr = tran_exp[e] * tran_mant[m]; 111 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 112 113 e = UNSTUFF_BITS(resp, 47, 3); 114 m = UNSTUFF_BITS(resp, 62, 12); 115 csd->capacity = (1 + m) << (e + 2); 116 117 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 118 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 119 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 120 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 121 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 122 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 123 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 124 125 if (UNSTUFF_BITS(resp, 46, 1)) { 126 csd->erase_size = 1; 127 } else if (csd->write_blkbits >= 9) { 128 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; 129 csd->erase_size <<= csd->write_blkbits - 9; 130 } 131 break; 132 case 1: 133 /* 134 * This is a block-addressed SDHC or SDXC card. Most 135 * interesting fields are unused and have fixed 136 * values. To avoid getting tripped by buggy cards, 137 * we assume those fixed values ourselves. 138 */ 139 mmc_card_set_blockaddr(card); 140 141 csd->tacc_ns = 0; /* Unused */ 142 csd->tacc_clks = 0; /* Unused */ 143 144 m = UNSTUFF_BITS(resp, 99, 4); 145 e = UNSTUFF_BITS(resp, 96, 3); 146 csd->max_dtr = tran_exp[e] * tran_mant[m]; 147 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 148 csd->c_size = UNSTUFF_BITS(resp, 48, 22); 149 150 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */ 151 if (csd->c_size >= 0xFFFF) 152 mmc_card_set_ext_capacity(card); 153 154 m = UNSTUFF_BITS(resp, 48, 22); 155 csd->capacity = (1 + m) << 10; 156 157 csd->read_blkbits = 9; 158 csd->read_partial = 0; 159 csd->write_misalign = 0; 160 csd->read_misalign = 0; 161 csd->r2w_factor = 4; /* Unused */ 162 csd->write_blkbits = 9; 163 csd->write_partial = 0; 164 csd->erase_size = 1; 165 break; 166 default: 167 pr_err("%s: unrecognised CSD structure version %d\n", 168 mmc_hostname(card->host), csd_struct); 169 return -EINVAL; 170 } 171 172 card->erase_size = csd->erase_size; 173 174 return 0; 175 } 176 177 /* 178 * Given a 64-bit response, decode to our card SCR structure. 179 */ 180 static int mmc_decode_scr(struct mmc_card *card) 181 { 182 struct sd_scr *scr = &card->scr; 183 unsigned int scr_struct; 184 u32 resp[4]; 185 186 resp[3] = card->raw_scr[1]; 187 resp[2] = card->raw_scr[0]; 188 189 scr_struct = UNSTUFF_BITS(resp, 60, 4); 190 if (scr_struct != 0) { 191 pr_err("%s: unrecognised SCR structure version %d\n", 192 mmc_hostname(card->host), scr_struct); 193 return -EINVAL; 194 } 195 196 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 197 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 198 if (scr->sda_vsn == SCR_SPEC_VER_2) 199 /* Check if Physical Layer Spec v3.0 is supported */ 200 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); 201 202 if (UNSTUFF_BITS(resp, 55, 1)) 203 card->erased_byte = 0xFF; 204 else 205 card->erased_byte = 0x0; 206 207 if (scr->sda_spec3) 208 scr->cmds = UNSTUFF_BITS(resp, 32, 2); 209 return 0; 210 } 211 212 /* 213 * Fetch and process SD Status register. 214 */ 215 static int mmc_read_ssr(struct mmc_card *card) 216 { 217 unsigned int au, es, et, eo; 218 int err, i; 219 u32 *ssr; 220 221 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 222 pr_warning("%s: card lacks mandatory SD Status " 223 "function.\n", mmc_hostname(card->host)); 224 return 0; 225 } 226 227 ssr = kmalloc(64, GFP_KERNEL); 228 if (!ssr) 229 return -ENOMEM; 230 231 err = mmc_app_sd_status(card, ssr); 232 if (err) { 233 pr_warning("%s: problem reading SD Status " 234 "register.\n", mmc_hostname(card->host)); 235 err = 0; 236 goto out; 237 } 238 239 for (i = 0; i < 16; i++) 240 ssr[i] = be32_to_cpu(ssr[i]); 241 242 /* 243 * UNSTUFF_BITS only works with four u32s so we have to offset the 244 * bitfield positions accordingly. 245 */ 246 au = UNSTUFF_BITS(ssr, 428 - 384, 4); 247 if (au > 0 && au <= 9) { 248 card->ssr.au = 1 << (au + 4); 249 es = UNSTUFF_BITS(ssr, 408 - 384, 16); 250 et = UNSTUFF_BITS(ssr, 402 - 384, 6); 251 eo = UNSTUFF_BITS(ssr, 400 - 384, 2); 252 if (es && et) { 253 card->ssr.erase_timeout = (et * 1000) / es; 254 card->ssr.erase_offset = eo * 1000; 255 } 256 } else { 257 pr_warning("%s: SD Status: Invalid Allocation Unit " 258 "size.\n", mmc_hostname(card->host)); 259 } 260 out: 261 kfree(ssr); 262 return err; 263 } 264 265 /* 266 * Fetches and decodes switch information 267 */ 268 static int mmc_read_switch(struct mmc_card *card) 269 { 270 int err; 271 u8 *status; 272 273 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 274 return 0; 275 276 if (!(card->csd.cmdclass & CCC_SWITCH)) { 277 pr_warning("%s: card lacks mandatory switch " 278 "function, performance might suffer.\n", 279 mmc_hostname(card->host)); 280 return 0; 281 } 282 283 err = -EIO; 284 285 status = kmalloc(64, GFP_KERNEL); 286 if (!status) { 287 pr_err("%s: could not allocate a buffer for " 288 "switch capabilities.\n", 289 mmc_hostname(card->host)); 290 return -ENOMEM; 291 } 292 293 /* 294 * Find out the card's support bits with a mode 0 operation. 295 * The argument does not matter, as the support bits do not 296 * change with the arguments. 297 */ 298 err = mmc_sd_switch(card, 0, 0, 0, status); 299 if (err) { 300 /* 301 * If the host or the card can't do the switch, 302 * fail more gracefully. 303 */ 304 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 305 goto out; 306 307 pr_warning("%s: problem reading Bus Speed modes.\n", 308 mmc_hostname(card->host)); 309 err = 0; 310 311 goto out; 312 } 313 314 if (status[13] & SD_MODE_HIGH_SPEED) 315 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; 316 317 if (card->scr.sda_spec3) { 318 card->sw_caps.sd3_bus_mode = status[13]; 319 /* Driver Strengths supported by the card */ 320 card->sw_caps.sd3_drv_type = status[9]; 321 } 322 323 out: 324 kfree(status); 325 326 return err; 327 } 328 329 /* 330 * Test if the card supports high-speed mode and, if so, switch to it. 331 */ 332 int mmc_sd_switch_hs(struct mmc_card *card) 333 { 334 int err; 335 u8 *status; 336 337 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 338 return 0; 339 340 if (!(card->csd.cmdclass & CCC_SWITCH)) 341 return 0; 342 343 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 344 return 0; 345 346 if (card->sw_caps.hs_max_dtr == 0) 347 return 0; 348 349 err = -EIO; 350 351 status = kmalloc(64, GFP_KERNEL); 352 if (!status) { 353 pr_err("%s: could not allocate a buffer for " 354 "switch capabilities.\n", mmc_hostname(card->host)); 355 return -ENOMEM; 356 } 357 358 err = mmc_sd_switch(card, 1, 0, 1, status); 359 if (err) 360 goto out; 361 362 if ((status[16] & 0xF) != 1) { 363 pr_warning("%s: Problem switching card " 364 "into high-speed mode!\n", 365 mmc_hostname(card->host)); 366 err = 0; 367 } else { 368 err = 1; 369 } 370 371 out: 372 kfree(status); 373 374 return err; 375 } 376 377 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 378 { 379 int host_drv_type = SD_DRIVER_TYPE_B; 380 int card_drv_type = SD_DRIVER_TYPE_B; 381 int drive_strength; 382 int err; 383 384 /* 385 * If the host doesn't support any of the Driver Types A,C or D, 386 * or there is no board specific handler then default Driver 387 * Type B is used. 388 */ 389 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C 390 | MMC_CAP_DRIVER_TYPE_D))) 391 return 0; 392 393 if (!card->host->ops->select_drive_strength) 394 return 0; 395 396 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) 397 host_drv_type |= SD_DRIVER_TYPE_A; 398 399 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) 400 host_drv_type |= SD_DRIVER_TYPE_C; 401 402 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) 403 host_drv_type |= SD_DRIVER_TYPE_D; 404 405 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) 406 card_drv_type |= SD_DRIVER_TYPE_A; 407 408 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 409 card_drv_type |= SD_DRIVER_TYPE_C; 410 411 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D) 412 card_drv_type |= SD_DRIVER_TYPE_D; 413 414 /* 415 * The drive strength that the hardware can support 416 * depends on the board design. Pass the appropriate 417 * information and let the hardware specific code 418 * return what is possible given the options 419 */ 420 mmc_host_clk_hold(card->host); 421 drive_strength = card->host->ops->select_drive_strength( 422 card->sw_caps.uhs_max_dtr, 423 host_drv_type, card_drv_type); 424 mmc_host_clk_release(card->host); 425 426 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 427 if (err) 428 return err; 429 430 if ((status[15] & 0xF) != drive_strength) { 431 pr_warning("%s: Problem setting drive strength!\n", 432 mmc_hostname(card->host)); 433 return 0; 434 } 435 436 mmc_set_driver_type(card->host, drive_strength); 437 438 return 0; 439 } 440 441 static void sd_update_bus_speed_mode(struct mmc_card *card) 442 { 443 /* 444 * If the host doesn't support any of the UHS-I modes, fallback on 445 * default speed. 446 */ 447 if (!mmc_host_uhs(card->host)) { 448 card->sd_bus_speed = 0; 449 return; 450 } 451 452 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 453 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 454 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 455 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 456 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 457 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 458 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 459 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 460 SD_MODE_UHS_SDR50)) { 461 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 462 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 463 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 464 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 465 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 466 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 467 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 468 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 469 SD_MODE_UHS_SDR12)) { 470 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 471 } 472 } 473 474 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 475 { 476 int err; 477 unsigned int timing = 0; 478 479 switch (card->sd_bus_speed) { 480 case UHS_SDR104_BUS_SPEED: 481 timing = MMC_TIMING_UHS_SDR104; 482 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 483 break; 484 case UHS_DDR50_BUS_SPEED: 485 timing = MMC_TIMING_UHS_DDR50; 486 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 487 break; 488 case UHS_SDR50_BUS_SPEED: 489 timing = MMC_TIMING_UHS_SDR50; 490 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 491 break; 492 case UHS_SDR25_BUS_SPEED: 493 timing = MMC_TIMING_UHS_SDR25; 494 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 495 break; 496 case UHS_SDR12_BUS_SPEED: 497 timing = MMC_TIMING_UHS_SDR12; 498 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 499 break; 500 default: 501 return 0; 502 } 503 504 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 505 if (err) 506 return err; 507 508 if ((status[16] & 0xF) != card->sd_bus_speed) 509 pr_warning("%s: Problem setting bus speed mode!\n", 510 mmc_hostname(card->host)); 511 else { 512 mmc_set_timing(card->host, timing); 513 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 514 } 515 516 return 0; 517 } 518 519 /* Get host's max current setting at its current voltage */ 520 static u32 sd_get_host_max_current(struct mmc_host *host) 521 { 522 u32 voltage, max_current; 523 524 voltage = 1 << host->ios.vdd; 525 switch (voltage) { 526 case MMC_VDD_165_195: 527 max_current = host->max_current_180; 528 break; 529 case MMC_VDD_29_30: 530 case MMC_VDD_30_31: 531 max_current = host->max_current_300; 532 break; 533 case MMC_VDD_32_33: 534 case MMC_VDD_33_34: 535 max_current = host->max_current_330; 536 break; 537 default: 538 max_current = 0; 539 } 540 541 return max_current; 542 } 543 544 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 545 { 546 int current_limit = SD_SET_CURRENT_NO_CHANGE; 547 int err; 548 u32 max_current; 549 550 /* 551 * Current limit switch is only defined for SDR50, SDR104, and DDR50 552 * bus speed modes. For other bus speed modes, we do not change the 553 * current limit. 554 */ 555 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && 556 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && 557 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) 558 return 0; 559 560 /* 561 * Host has different current capabilities when operating at 562 * different voltages, so find out its max current first. 563 */ 564 max_current = sd_get_host_max_current(card->host); 565 566 /* 567 * We only check host's capability here, if we set a limit that is 568 * higher than the card's maximum current, the card will be using its 569 * maximum current, e.g. if the card's maximum current is 300ma, and 570 * when we set current limit to 200ma, the card will draw 200ma, and 571 * when we set current limit to 400/600/800ma, the card will draw its 572 * maximum 300ma from the host. 573 */ 574 if (max_current >= 800) 575 current_limit = SD_SET_CURRENT_LIMIT_800; 576 else if (max_current >= 600) 577 current_limit = SD_SET_CURRENT_LIMIT_600; 578 else if (max_current >= 400) 579 current_limit = SD_SET_CURRENT_LIMIT_400; 580 else if (max_current >= 200) 581 current_limit = SD_SET_CURRENT_LIMIT_200; 582 583 if (current_limit != SD_SET_CURRENT_NO_CHANGE) { 584 err = mmc_sd_switch(card, 1, 3, current_limit, status); 585 if (err) 586 return err; 587 588 if (((status[15] >> 4) & 0x0F) != current_limit) 589 pr_warning("%s: Problem setting current limit!\n", 590 mmc_hostname(card->host)); 591 592 } 593 594 return 0; 595 } 596 597 /* 598 * UHS-I specific initialization procedure 599 */ 600 static int mmc_sd_init_uhs_card(struct mmc_card *card) 601 { 602 int err; 603 u8 *status; 604 605 if (!card->scr.sda_spec3) 606 return 0; 607 608 if (!(card->csd.cmdclass & CCC_SWITCH)) 609 return 0; 610 611 status = kmalloc(64, GFP_KERNEL); 612 if (!status) { 613 pr_err("%s: could not allocate a buffer for " 614 "switch capabilities.\n", mmc_hostname(card->host)); 615 return -ENOMEM; 616 } 617 618 /* Set 4-bit bus width */ 619 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 620 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 621 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 622 if (err) 623 goto out; 624 625 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 626 } 627 628 /* 629 * Select the bus speed mode depending on host 630 * and card capability. 631 */ 632 sd_update_bus_speed_mode(card); 633 634 /* Set the driver strength for the card */ 635 err = sd_select_driver_type(card, status); 636 if (err) 637 goto out; 638 639 /* Set current limit for the card */ 640 err = sd_set_current_limit(card, status); 641 if (err) 642 goto out; 643 644 /* Set bus speed mode of the card */ 645 err = sd_set_bus_speed_mode(card, status); 646 if (err) 647 goto out; 648 649 /* SPI mode doesn't define CMD19 */ 650 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) { 651 mmc_host_clk_hold(card->host); 652 err = card->host->ops->execute_tuning(card->host, 653 MMC_SEND_TUNING_BLOCK); 654 mmc_host_clk_release(card->host); 655 } 656 657 out: 658 kfree(status); 659 660 return err; 661 } 662 663 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 664 card->raw_cid[2], card->raw_cid[3]); 665 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 666 card->raw_csd[2], card->raw_csd[3]); 667 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 668 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 669 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 670 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 671 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 672 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 673 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 674 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 675 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 676 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 677 678 679 static struct attribute *sd_std_attrs[] = { 680 &dev_attr_cid.attr, 681 &dev_attr_csd.attr, 682 &dev_attr_scr.attr, 683 &dev_attr_date.attr, 684 &dev_attr_erase_size.attr, 685 &dev_attr_preferred_erase_size.attr, 686 &dev_attr_fwrev.attr, 687 &dev_attr_hwrev.attr, 688 &dev_attr_manfid.attr, 689 &dev_attr_name.attr, 690 &dev_attr_oemid.attr, 691 &dev_attr_serial.attr, 692 NULL, 693 }; 694 695 static struct attribute_group sd_std_attr_group = { 696 .attrs = sd_std_attrs, 697 }; 698 699 static const struct attribute_group *sd_attr_groups[] = { 700 &sd_std_attr_group, 701 NULL, 702 }; 703 704 struct device_type sd_type = { 705 .groups = sd_attr_groups, 706 }; 707 708 /* 709 * Fetch CID from card. 710 */ 711 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 712 { 713 int err; 714 u32 max_current; 715 int retries = 10; 716 717 try_again: 718 if (!retries) { 719 ocr &= ~SD_OCR_S18R; 720 pr_warning("%s: Skipping voltage switch\n", 721 mmc_hostname(host)); 722 } 723 724 /* 725 * Since we're changing the OCR value, we seem to 726 * need to tell some cards to go back to the idle 727 * state. We wait 1ms to give cards time to 728 * respond. 729 */ 730 mmc_go_idle(host); 731 732 /* 733 * If SD_SEND_IF_COND indicates an SD 2.0 734 * compliant card and we should set bit 30 735 * of the ocr to indicate that we can handle 736 * block-addressed SDHC cards. 737 */ 738 err = mmc_send_if_cond(host, ocr); 739 if (!err) 740 ocr |= SD_OCR_CCS; 741 742 /* 743 * If the host supports one of UHS-I modes, request the card 744 * to switch to 1.8V signaling level. If the card has failed 745 * repeatedly to switch however, skip this. 746 */ 747 if (retries && mmc_host_uhs(host)) 748 ocr |= SD_OCR_S18R; 749 750 /* 751 * If the host can supply more than 150mA at current voltage, 752 * XPC should be set to 1. 753 */ 754 max_current = sd_get_host_max_current(host); 755 if (max_current > 150) 756 ocr |= SD_OCR_XPC; 757 758 err = mmc_send_app_op_cond(host, ocr, rocr); 759 if (err) 760 return err; 761 762 /* 763 * In case CCS and S18A in the response is set, start Signal Voltage 764 * Switch procedure. SPI mode doesn't support CMD11. 765 */ 766 if (!mmc_host_is_spi(host) && rocr && 767 ((*rocr & 0x41000000) == 0x41000000)) { 768 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180); 769 if (err == -EAGAIN) { 770 retries--; 771 goto try_again; 772 } else if (err) { 773 retries = 0; 774 goto try_again; 775 } 776 } 777 778 if (mmc_host_is_spi(host)) 779 err = mmc_send_cid(host, cid); 780 else 781 err = mmc_all_send_cid(host, cid); 782 783 return err; 784 } 785 786 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 787 { 788 int err; 789 790 /* 791 * Fetch CSD from card. 792 */ 793 err = mmc_send_csd(card, card->raw_csd); 794 if (err) 795 return err; 796 797 err = mmc_decode_csd(card); 798 if (err) 799 return err; 800 801 return 0; 802 } 803 804 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 805 bool reinit) 806 { 807 int err; 808 809 if (!reinit) { 810 /* 811 * Fetch SCR from card. 812 */ 813 err = mmc_app_send_scr(card, card->raw_scr); 814 if (err) 815 return err; 816 817 err = mmc_decode_scr(card); 818 if (err) 819 return err; 820 821 /* 822 * Fetch and process SD Status register. 823 */ 824 err = mmc_read_ssr(card); 825 if (err) 826 return err; 827 828 /* Erase init depends on CSD and SSR */ 829 mmc_init_erase(card); 830 831 /* 832 * Fetch switch information from card. 833 */ 834 err = mmc_read_switch(card); 835 if (err) 836 return err; 837 } 838 839 /* 840 * For SPI, enable CRC as appropriate. 841 * This CRC enable is located AFTER the reading of the 842 * card registers because some SDHC cards are not able 843 * to provide valid CRCs for non-512-byte blocks. 844 */ 845 if (mmc_host_is_spi(host)) { 846 err = mmc_spi_set_crc(host, use_spi_crc); 847 if (err) 848 return err; 849 } 850 851 /* 852 * Check if read-only switch is active. 853 */ 854 if (!reinit) { 855 int ro = -1; 856 857 if (host->ops->get_ro) { 858 mmc_host_clk_hold(card->host); 859 ro = host->ops->get_ro(host); 860 mmc_host_clk_release(card->host); 861 } 862 863 if (ro < 0) { 864 pr_warning("%s: host does not " 865 "support reading read-only " 866 "switch. assuming write-enable.\n", 867 mmc_hostname(host)); 868 } else if (ro > 0) { 869 mmc_card_set_readonly(card); 870 } 871 } 872 873 return 0; 874 } 875 876 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 877 { 878 unsigned max_dtr = (unsigned int)-1; 879 880 if (mmc_card_highspeed(card)) { 881 if (max_dtr > card->sw_caps.hs_max_dtr) 882 max_dtr = card->sw_caps.hs_max_dtr; 883 } else if (max_dtr > card->csd.max_dtr) { 884 max_dtr = card->csd.max_dtr; 885 } 886 887 return max_dtr; 888 } 889 890 void mmc_sd_go_highspeed(struct mmc_card *card) 891 { 892 mmc_card_set_highspeed(card); 893 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 894 } 895 896 /* 897 * Handle the detection and initialisation of a card. 898 * 899 * In the case of a resume, "oldcard" will contain the card 900 * we're trying to reinitialise. 901 */ 902 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 903 struct mmc_card *oldcard) 904 { 905 struct mmc_card *card; 906 int err; 907 u32 cid[4]; 908 u32 rocr = 0; 909 910 BUG_ON(!host); 911 WARN_ON(!host->claimed); 912 913 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 914 if (err) 915 return err; 916 917 if (oldcard) { 918 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 919 return -ENOENT; 920 921 card = oldcard; 922 } else { 923 /* 924 * Allocate card structure. 925 */ 926 card = mmc_alloc_card(host, &sd_type); 927 if (IS_ERR(card)) 928 return PTR_ERR(card); 929 930 card->type = MMC_TYPE_SD; 931 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 932 } 933 934 /* 935 * For native busses: get card RCA and quit open drain mode. 936 */ 937 if (!mmc_host_is_spi(host)) { 938 err = mmc_send_relative_addr(host, &card->rca); 939 if (err) 940 return err; 941 } 942 943 if (!oldcard) { 944 err = mmc_sd_get_csd(host, card); 945 if (err) 946 return err; 947 948 mmc_decode_cid(card); 949 } 950 951 /* 952 * Select card, as all following commands rely on that. 953 */ 954 if (!mmc_host_is_spi(host)) { 955 err = mmc_select_card(card); 956 if (err) 957 return err; 958 } 959 960 err = mmc_sd_setup_card(host, card, oldcard != NULL); 961 if (err) 962 goto free_card; 963 964 /* Initialization sequence for UHS-I cards */ 965 if (rocr & SD_ROCR_S18A) { 966 err = mmc_sd_init_uhs_card(card); 967 if (err) 968 goto free_card; 969 970 /* Card is an ultra-high-speed card */ 971 mmc_card_set_uhs(card); 972 } else { 973 /* 974 * Attempt to change to high-speed (if supported) 975 */ 976 err = mmc_sd_switch_hs(card); 977 if (err > 0) 978 mmc_sd_go_highspeed(card); 979 else if (err) 980 goto free_card; 981 982 /* 983 * Set bus speed. 984 */ 985 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 986 987 /* 988 * Switch to wider bus (if supported). 989 */ 990 if ((host->caps & MMC_CAP_4_BIT_DATA) && 991 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 992 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 993 if (err) 994 goto free_card; 995 996 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 997 } 998 } 999 1000 host->card = card; 1001 return 0; 1002 1003 free_card: 1004 if (!oldcard) 1005 mmc_remove_card(card); 1006 1007 return err; 1008 } 1009 1010 /* 1011 * Host is being removed. Free up the current card. 1012 */ 1013 static void mmc_sd_remove(struct mmc_host *host) 1014 { 1015 BUG_ON(!host); 1016 BUG_ON(!host->card); 1017 1018 mmc_remove_card(host->card); 1019 host->card = NULL; 1020 } 1021 1022 /* 1023 * Card detection - card is alive. 1024 */ 1025 static int mmc_sd_alive(struct mmc_host *host) 1026 { 1027 return mmc_send_status(host->card, NULL); 1028 } 1029 1030 /* 1031 * Card detection callback from host. 1032 */ 1033 static void mmc_sd_detect(struct mmc_host *host) 1034 { 1035 int err; 1036 1037 BUG_ON(!host); 1038 BUG_ON(!host->card); 1039 1040 mmc_claim_host(host); 1041 1042 /* 1043 * Just check if our card has been removed. 1044 */ 1045 err = _mmc_detect_card_removed(host); 1046 1047 mmc_release_host(host); 1048 1049 if (err) { 1050 mmc_sd_remove(host); 1051 1052 mmc_claim_host(host); 1053 mmc_detach_bus(host); 1054 mmc_power_off(host); 1055 mmc_release_host(host); 1056 } 1057 } 1058 1059 /* 1060 * Suspend callback from host. 1061 */ 1062 static int mmc_sd_suspend(struct mmc_host *host) 1063 { 1064 int err = 0; 1065 1066 BUG_ON(!host); 1067 BUG_ON(!host->card); 1068 1069 mmc_claim_host(host); 1070 if (!mmc_host_is_spi(host)) 1071 err = mmc_deselect_cards(host); 1072 host->card->state &= ~MMC_STATE_HIGHSPEED; 1073 mmc_release_host(host); 1074 1075 return err; 1076 } 1077 1078 /* 1079 * Resume callback from host. 1080 * 1081 * This function tries to determine if the same card is still present 1082 * and, if so, restore all state to it. 1083 */ 1084 static int mmc_sd_resume(struct mmc_host *host) 1085 { 1086 int err; 1087 1088 BUG_ON(!host); 1089 BUG_ON(!host->card); 1090 1091 mmc_claim_host(host); 1092 err = mmc_sd_init_card(host, host->ocr, host->card); 1093 mmc_release_host(host); 1094 1095 return err; 1096 } 1097 1098 static int mmc_sd_power_restore(struct mmc_host *host) 1099 { 1100 int ret; 1101 1102 host->card->state &= ~MMC_STATE_HIGHSPEED; 1103 mmc_claim_host(host); 1104 ret = mmc_sd_init_card(host, host->ocr, host->card); 1105 mmc_release_host(host); 1106 1107 return ret; 1108 } 1109 1110 static const struct mmc_bus_ops mmc_sd_ops = { 1111 .remove = mmc_sd_remove, 1112 .detect = mmc_sd_detect, 1113 .suspend = NULL, 1114 .resume = NULL, 1115 .power_restore = mmc_sd_power_restore, 1116 .alive = mmc_sd_alive, 1117 }; 1118 1119 static const struct mmc_bus_ops mmc_sd_ops_unsafe = { 1120 .remove = mmc_sd_remove, 1121 .detect = mmc_sd_detect, 1122 .suspend = mmc_sd_suspend, 1123 .resume = mmc_sd_resume, 1124 .power_restore = mmc_sd_power_restore, 1125 .alive = mmc_sd_alive, 1126 }; 1127 1128 static void mmc_sd_attach_bus_ops(struct mmc_host *host) 1129 { 1130 const struct mmc_bus_ops *bus_ops; 1131 1132 if (!mmc_card_is_removable(host)) 1133 bus_ops = &mmc_sd_ops_unsafe; 1134 else 1135 bus_ops = &mmc_sd_ops; 1136 mmc_attach_bus(host, bus_ops); 1137 } 1138 1139 /* 1140 * Starting point for SD card init. 1141 */ 1142 int mmc_attach_sd(struct mmc_host *host) 1143 { 1144 int err; 1145 u32 ocr; 1146 1147 BUG_ON(!host); 1148 WARN_ON(!host->claimed); 1149 1150 err = mmc_send_app_op_cond(host, 0, &ocr); 1151 if (err) 1152 return err; 1153 1154 mmc_sd_attach_bus_ops(host); 1155 if (host->ocr_avail_sd) 1156 host->ocr_avail = host->ocr_avail_sd; 1157 1158 /* 1159 * We need to get OCR a different way for SPI. 1160 */ 1161 if (mmc_host_is_spi(host)) { 1162 mmc_go_idle(host); 1163 1164 err = mmc_spi_read_ocr(host, 0, &ocr); 1165 if (err) 1166 goto err; 1167 } 1168 1169 /* 1170 * Sanity check the voltages that the card claims to 1171 * support. 1172 */ 1173 if (ocr & 0x7F) { 1174 pr_warning("%s: card claims to support voltages " 1175 "below the defined range. These will be ignored.\n", 1176 mmc_hostname(host)); 1177 ocr &= ~0x7F; 1178 } 1179 1180 if ((ocr & MMC_VDD_165_195) && 1181 !(host->ocr_avail_sd & MMC_VDD_165_195)) { 1182 pr_warning("%s: SD card claims to support the " 1183 "incompletely defined 'low voltage range'. This " 1184 "will be ignored.\n", mmc_hostname(host)); 1185 ocr &= ~MMC_VDD_165_195; 1186 } 1187 1188 host->ocr = mmc_select_voltage(host, ocr); 1189 1190 /* 1191 * Can we support the voltage(s) of the card(s)? 1192 */ 1193 if (!host->ocr) { 1194 err = -EINVAL; 1195 goto err; 1196 } 1197 1198 /* 1199 * Detect and init the card. 1200 */ 1201 err = mmc_sd_init_card(host, host->ocr, NULL); 1202 if (err) 1203 goto err; 1204 1205 mmc_release_host(host); 1206 err = mmc_add_card(host->card); 1207 mmc_claim_host(host); 1208 if (err) 1209 goto remove_card; 1210 1211 return 0; 1212 1213 remove_card: 1214 mmc_release_host(host); 1215 mmc_remove_card(host->card); 1216 host->card = NULL; 1217 mmc_claim_host(host); 1218 err: 1219 mmc_detach_bus(host); 1220 1221 pr_err("%s: error %d whilst initialising SD card\n", 1222 mmc_hostname(host), err); 1223 1224 return err; 1225 } 1226 1227