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 /* Find out the supported Bus Speed Modes. */ 294 err = mmc_sd_switch(card, 0, 0, 1, status); 295 if (err) { 296 /* 297 * If the host or the card can't do the switch, 298 * fail more gracefully. 299 */ 300 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 301 goto out; 302 303 pr_warning("%s: problem reading Bus Speed modes.\n", 304 mmc_hostname(card->host)); 305 err = 0; 306 307 goto out; 308 } 309 310 if (status[13] & SD_MODE_HIGH_SPEED) 311 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; 312 313 if (card->scr.sda_spec3) { 314 card->sw_caps.sd3_bus_mode = status[13]; 315 316 /* Find out Driver Strengths supported by the card */ 317 err = mmc_sd_switch(card, 0, 2, 1, status); 318 if (err) { 319 /* 320 * If the host or the card can't do the switch, 321 * fail more gracefully. 322 */ 323 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 324 goto out; 325 326 pr_warning("%s: problem reading " 327 "Driver Strength.\n", 328 mmc_hostname(card->host)); 329 err = 0; 330 331 goto out; 332 } 333 334 card->sw_caps.sd3_drv_type = status[9]; 335 336 /* Find out Current Limits supported by the card */ 337 err = mmc_sd_switch(card, 0, 3, 1, status); 338 if (err) { 339 /* 340 * If the host or the card can't do the switch, 341 * fail more gracefully. 342 */ 343 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 344 goto out; 345 346 pr_warning("%s: problem reading " 347 "Current Limit.\n", 348 mmc_hostname(card->host)); 349 err = 0; 350 351 goto out; 352 } 353 354 card->sw_caps.sd3_curr_limit = status[7]; 355 } 356 357 out: 358 kfree(status); 359 360 return err; 361 } 362 363 /* 364 * Test if the card supports high-speed mode and, if so, switch to it. 365 */ 366 int mmc_sd_switch_hs(struct mmc_card *card) 367 { 368 int err; 369 u8 *status; 370 371 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 372 return 0; 373 374 if (!(card->csd.cmdclass & CCC_SWITCH)) 375 return 0; 376 377 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 378 return 0; 379 380 if (card->sw_caps.hs_max_dtr == 0) 381 return 0; 382 383 err = -EIO; 384 385 status = kmalloc(64, GFP_KERNEL); 386 if (!status) { 387 pr_err("%s: could not allocate a buffer for " 388 "switch capabilities.\n", mmc_hostname(card->host)); 389 return -ENOMEM; 390 } 391 392 err = mmc_sd_switch(card, 1, 0, 1, status); 393 if (err) 394 goto out; 395 396 if ((status[16] & 0xF) != 1) { 397 pr_warning("%s: Problem switching card " 398 "into high-speed mode!\n", 399 mmc_hostname(card->host)); 400 err = 0; 401 } else { 402 err = 1; 403 } 404 405 out: 406 kfree(status); 407 408 return err; 409 } 410 411 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 412 { 413 int host_drv_type = SD_DRIVER_TYPE_B; 414 int card_drv_type = SD_DRIVER_TYPE_B; 415 int drive_strength; 416 int err; 417 418 /* 419 * If the host doesn't support any of the Driver Types A,C or D, 420 * or there is no board specific handler then default Driver 421 * Type B is used. 422 */ 423 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C 424 | MMC_CAP_DRIVER_TYPE_D))) 425 return 0; 426 427 if (!card->host->ops->select_drive_strength) 428 return 0; 429 430 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) 431 host_drv_type |= SD_DRIVER_TYPE_A; 432 433 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) 434 host_drv_type |= SD_DRIVER_TYPE_C; 435 436 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) 437 host_drv_type |= SD_DRIVER_TYPE_D; 438 439 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) 440 card_drv_type |= SD_DRIVER_TYPE_A; 441 442 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 443 card_drv_type |= SD_DRIVER_TYPE_C; 444 445 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D) 446 card_drv_type |= SD_DRIVER_TYPE_D; 447 448 /* 449 * The drive strength that the hardware can support 450 * depends on the board design. Pass the appropriate 451 * information and let the hardware specific code 452 * return what is possible given the options 453 */ 454 mmc_host_clk_hold(card->host); 455 drive_strength = card->host->ops->select_drive_strength( 456 card->sw_caps.uhs_max_dtr, 457 host_drv_type, card_drv_type); 458 mmc_host_clk_release(card->host); 459 460 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 461 if (err) 462 return err; 463 464 if ((status[15] & 0xF) != drive_strength) { 465 pr_warning("%s: Problem setting drive strength!\n", 466 mmc_hostname(card->host)); 467 return 0; 468 } 469 470 mmc_set_driver_type(card->host, drive_strength); 471 472 return 0; 473 } 474 475 static void sd_update_bus_speed_mode(struct mmc_card *card) 476 { 477 /* 478 * If the host doesn't support any of the UHS-I modes, fallback on 479 * default speed. 480 */ 481 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 482 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) { 483 card->sd_bus_speed = 0; 484 return; 485 } 486 487 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 488 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 489 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 490 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 491 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 492 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 493 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 494 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 495 SD_MODE_UHS_SDR50)) { 496 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 497 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 498 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 499 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 500 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 501 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 502 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 503 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 504 SD_MODE_UHS_SDR12)) { 505 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 506 } 507 } 508 509 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 510 { 511 int err; 512 unsigned int timing = 0; 513 514 switch (card->sd_bus_speed) { 515 case UHS_SDR104_BUS_SPEED: 516 timing = MMC_TIMING_UHS_SDR104; 517 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 518 break; 519 case UHS_DDR50_BUS_SPEED: 520 timing = MMC_TIMING_UHS_DDR50; 521 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 522 break; 523 case UHS_SDR50_BUS_SPEED: 524 timing = MMC_TIMING_UHS_SDR50; 525 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 526 break; 527 case UHS_SDR25_BUS_SPEED: 528 timing = MMC_TIMING_UHS_SDR25; 529 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 530 break; 531 case UHS_SDR12_BUS_SPEED: 532 timing = MMC_TIMING_UHS_SDR12; 533 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 534 break; 535 default: 536 return 0; 537 } 538 539 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 540 if (err) 541 return err; 542 543 if ((status[16] & 0xF) != card->sd_bus_speed) 544 pr_warning("%s: Problem setting bus speed mode!\n", 545 mmc_hostname(card->host)); 546 else { 547 mmc_set_timing(card->host, timing); 548 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 549 } 550 551 return 0; 552 } 553 554 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 555 { 556 int current_limit = 0; 557 int err; 558 559 /* 560 * Current limit switch is only defined for SDR50, SDR104, and DDR50 561 * bus speed modes. For other bus speed modes, we set the default 562 * current limit of 200mA. 563 */ 564 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) || 565 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) || 566 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) { 567 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) { 568 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) 569 current_limit = SD_SET_CURRENT_LIMIT_800; 570 else if (card->sw_caps.sd3_curr_limit & 571 SD_MAX_CURRENT_600) 572 current_limit = SD_SET_CURRENT_LIMIT_600; 573 else if (card->sw_caps.sd3_curr_limit & 574 SD_MAX_CURRENT_400) 575 current_limit = SD_SET_CURRENT_LIMIT_400; 576 else if (card->sw_caps.sd3_curr_limit & 577 SD_MAX_CURRENT_200) 578 current_limit = SD_SET_CURRENT_LIMIT_200; 579 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) { 580 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) 581 current_limit = SD_SET_CURRENT_LIMIT_600; 582 else if (card->sw_caps.sd3_curr_limit & 583 SD_MAX_CURRENT_400) 584 current_limit = SD_SET_CURRENT_LIMIT_400; 585 else if (card->sw_caps.sd3_curr_limit & 586 SD_MAX_CURRENT_200) 587 current_limit = SD_SET_CURRENT_LIMIT_200; 588 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) { 589 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) 590 current_limit = SD_SET_CURRENT_LIMIT_400; 591 else if (card->sw_caps.sd3_curr_limit & 592 SD_MAX_CURRENT_200) 593 current_limit = SD_SET_CURRENT_LIMIT_200; 594 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) { 595 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) 596 current_limit = SD_SET_CURRENT_LIMIT_200; 597 } 598 } else 599 current_limit = SD_SET_CURRENT_LIMIT_200; 600 601 err = mmc_sd_switch(card, 1, 3, current_limit, status); 602 if (err) 603 return err; 604 605 if (((status[15] >> 4) & 0x0F) != current_limit) 606 pr_warning("%s: Problem setting current limit!\n", 607 mmc_hostname(card->host)); 608 609 return 0; 610 } 611 612 /* 613 * UHS-I specific initialization procedure 614 */ 615 static int mmc_sd_init_uhs_card(struct mmc_card *card) 616 { 617 int err; 618 u8 *status; 619 620 if (!card->scr.sda_spec3) 621 return 0; 622 623 if (!(card->csd.cmdclass & CCC_SWITCH)) 624 return 0; 625 626 status = kmalloc(64, GFP_KERNEL); 627 if (!status) { 628 pr_err("%s: could not allocate a buffer for " 629 "switch capabilities.\n", mmc_hostname(card->host)); 630 return -ENOMEM; 631 } 632 633 /* Set 4-bit bus width */ 634 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 635 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 636 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 637 if (err) 638 goto out; 639 640 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 641 } 642 643 /* 644 * Select the bus speed mode depending on host 645 * and card capability. 646 */ 647 sd_update_bus_speed_mode(card); 648 649 /* Set the driver strength for the card */ 650 err = sd_select_driver_type(card, status); 651 if (err) 652 goto out; 653 654 /* Set current limit for the card */ 655 err = sd_set_current_limit(card, status); 656 if (err) 657 goto out; 658 659 /* Set bus speed mode of the card */ 660 err = sd_set_bus_speed_mode(card, status); 661 if (err) 662 goto out; 663 664 /* SPI mode doesn't define CMD19 */ 665 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) { 666 mmc_host_clk_hold(card->host); 667 err = card->host->ops->execute_tuning(card->host, 668 MMC_SEND_TUNING_BLOCK); 669 mmc_host_clk_release(card->host); 670 } 671 672 out: 673 kfree(status); 674 675 return err; 676 } 677 678 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 679 card->raw_cid[2], card->raw_cid[3]); 680 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 681 card->raw_csd[2], card->raw_csd[3]); 682 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 683 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 684 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 685 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 686 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 687 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 688 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 689 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 690 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 691 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 692 693 694 static struct attribute *sd_std_attrs[] = { 695 &dev_attr_cid.attr, 696 &dev_attr_csd.attr, 697 &dev_attr_scr.attr, 698 &dev_attr_date.attr, 699 &dev_attr_erase_size.attr, 700 &dev_attr_preferred_erase_size.attr, 701 &dev_attr_fwrev.attr, 702 &dev_attr_hwrev.attr, 703 &dev_attr_manfid.attr, 704 &dev_attr_name.attr, 705 &dev_attr_oemid.attr, 706 &dev_attr_serial.attr, 707 NULL, 708 }; 709 710 static struct attribute_group sd_std_attr_group = { 711 .attrs = sd_std_attrs, 712 }; 713 714 static const struct attribute_group *sd_attr_groups[] = { 715 &sd_std_attr_group, 716 NULL, 717 }; 718 719 struct device_type sd_type = { 720 .groups = sd_attr_groups, 721 }; 722 723 /* 724 * Fetch CID from card. 725 */ 726 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 727 { 728 int err; 729 730 /* 731 * Since we're changing the OCR value, we seem to 732 * need to tell some cards to go back to the idle 733 * state. We wait 1ms to give cards time to 734 * respond. 735 */ 736 mmc_go_idle(host); 737 738 /* 739 * If SD_SEND_IF_COND indicates an SD 2.0 740 * compliant card and we should set bit 30 741 * of the ocr to indicate that we can handle 742 * block-addressed SDHC cards. 743 */ 744 err = mmc_send_if_cond(host, ocr); 745 if (!err) 746 ocr |= SD_OCR_CCS; 747 748 /* 749 * If the host supports one of UHS-I modes, request the card 750 * to switch to 1.8V signaling level. 751 */ 752 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 753 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)) 754 ocr |= SD_OCR_S18R; 755 756 /* If the host can supply more than 150mA, XPC should be set to 1. */ 757 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 | 758 MMC_CAP_SET_XPC_180)) 759 ocr |= SD_OCR_XPC; 760 761 try_again: 762 err = mmc_send_app_op_cond(host, ocr, rocr); 763 if (err) 764 return err; 765 766 /* 767 * In case CCS and S18A in the response is set, start Signal Voltage 768 * Switch procedure. SPI mode doesn't support CMD11. 769 */ 770 if (!mmc_host_is_spi(host) && rocr && 771 ((*rocr & 0x41000000) == 0x41000000)) { 772 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true); 773 if (err) { 774 ocr &= ~SD_OCR_S18R; 775 goto try_again; 776 } 777 } 778 779 if (mmc_host_is_spi(host)) 780 err = mmc_send_cid(host, cid); 781 else 782 err = mmc_all_send_cid(host, cid); 783 784 return err; 785 } 786 787 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 788 { 789 int err; 790 791 /* 792 * Fetch CSD from card. 793 */ 794 err = mmc_send_csd(card, card->raw_csd); 795 if (err) 796 return err; 797 798 err = mmc_decode_csd(card); 799 if (err) 800 return err; 801 802 return 0; 803 } 804 805 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 806 bool reinit) 807 { 808 int err; 809 810 if (!reinit) { 811 /* 812 * Fetch SCR from card. 813 */ 814 err = mmc_app_send_scr(card, card->raw_scr); 815 if (err) 816 return err; 817 818 err = mmc_decode_scr(card); 819 if (err) 820 return err; 821 822 /* 823 * Fetch and process SD Status register. 824 */ 825 err = mmc_read_ssr(card); 826 if (err) 827 return err; 828 829 /* Erase init depends on CSD and SSR */ 830 mmc_init_erase(card); 831 832 /* 833 * Fetch switch information from card. 834 */ 835 err = mmc_read_switch(card); 836 if (err) 837 return err; 838 } 839 840 /* 841 * For SPI, enable CRC as appropriate. 842 * This CRC enable is located AFTER the reading of the 843 * card registers because some SDHC cards are not able 844 * to provide valid CRCs for non-512-byte blocks. 845 */ 846 if (mmc_host_is_spi(host)) { 847 err = mmc_spi_set_crc(host, use_spi_crc); 848 if (err) 849 return err; 850 } 851 852 /* 853 * Check if read-only switch is active. 854 */ 855 if (!reinit) { 856 int ro = -1; 857 858 if (host->ops->get_ro) { 859 mmc_host_clk_hold(card->host); 860 ro = host->ops->get_ro(host); 861 mmc_host_clk_release(card->host); 862 } 863 864 if (ro < 0) { 865 pr_warning("%s: host does not " 866 "support reading read-only " 867 "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_highspeed(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 void mmc_sd_go_highspeed(struct mmc_card *card) 892 { 893 mmc_card_set_highspeed(card); 894 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 895 } 896 897 /* 898 * Handle the detection and initialisation of a card. 899 * 900 * In the case of a resume, "oldcard" will contain the card 901 * we're trying to reinitialise. 902 */ 903 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 904 struct mmc_card *oldcard) 905 { 906 struct mmc_card *card; 907 int err; 908 u32 cid[4]; 909 u32 rocr = 0; 910 911 BUG_ON(!host); 912 WARN_ON(!host->claimed); 913 914 /* The initialization should be done at 3.3 V I/O voltage. */ 915 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0); 916 917 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 918 if (err) 919 return err; 920 921 if (oldcard) { 922 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 923 return -ENOENT; 924 925 card = oldcard; 926 } else { 927 /* 928 * Allocate card structure. 929 */ 930 card = mmc_alloc_card(host, &sd_type); 931 if (IS_ERR(card)) 932 return PTR_ERR(card); 933 934 card->type = MMC_TYPE_SD; 935 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 936 } 937 938 /* 939 * For native busses: get card RCA and quit open drain mode. 940 */ 941 if (!mmc_host_is_spi(host)) { 942 err = mmc_send_relative_addr(host, &card->rca); 943 if (err) 944 return err; 945 } 946 947 if (!oldcard) { 948 err = mmc_sd_get_csd(host, card); 949 if (err) 950 return err; 951 952 mmc_decode_cid(card); 953 } 954 955 /* 956 * Select card, as all following commands rely on that. 957 */ 958 if (!mmc_host_is_spi(host)) { 959 err = mmc_select_card(card); 960 if (err) 961 return err; 962 } 963 964 err = mmc_sd_setup_card(host, card, oldcard != NULL); 965 if (err) 966 goto free_card; 967 968 /* Initialization sequence for UHS-I cards */ 969 if (rocr & SD_ROCR_S18A) { 970 err = mmc_sd_init_uhs_card(card); 971 if (err) 972 goto free_card; 973 974 /* Card is an ultra-high-speed card */ 975 mmc_card_set_uhs(card); 976 977 /* 978 * Since initialization is now complete, enable preset 979 * value registers for UHS-I cards. 980 */ 981 if (host->ops->enable_preset_value) { 982 mmc_host_clk_hold(card->host); 983 host->ops->enable_preset_value(host, true); 984 mmc_host_clk_release(card->host); 985 } 986 } else { 987 /* 988 * Attempt to change to high-speed (if supported) 989 */ 990 err = mmc_sd_switch_hs(card); 991 if (err > 0) 992 mmc_sd_go_highspeed(card); 993 else if (err) 994 goto free_card; 995 996 /* 997 * Set bus speed. 998 */ 999 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 1000 1001 /* 1002 * Switch to wider bus (if supported). 1003 */ 1004 if ((host->caps & MMC_CAP_4_BIT_DATA) && 1005 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 1006 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 1007 if (err) 1008 goto free_card; 1009 1010 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1011 } 1012 } 1013 1014 host->card = card; 1015 return 0; 1016 1017 free_card: 1018 if (!oldcard) 1019 mmc_remove_card(card); 1020 1021 return err; 1022 } 1023 1024 /* 1025 * Host is being removed. Free up the current card. 1026 */ 1027 static void mmc_sd_remove(struct mmc_host *host) 1028 { 1029 BUG_ON(!host); 1030 BUG_ON(!host->card); 1031 1032 mmc_remove_card(host->card); 1033 host->card = NULL; 1034 } 1035 1036 /* 1037 * Card detection - card is alive. 1038 */ 1039 static int mmc_sd_alive(struct mmc_host *host) 1040 { 1041 return mmc_send_status(host->card, NULL); 1042 } 1043 1044 /* 1045 * Card detection callback from host. 1046 */ 1047 static void mmc_sd_detect(struct mmc_host *host) 1048 { 1049 int err; 1050 1051 BUG_ON(!host); 1052 BUG_ON(!host->card); 1053 1054 mmc_claim_host(host); 1055 1056 /* 1057 * Just check if our card has been removed. 1058 */ 1059 err = _mmc_detect_card_removed(host); 1060 1061 mmc_release_host(host); 1062 1063 if (err) { 1064 mmc_sd_remove(host); 1065 1066 mmc_claim_host(host); 1067 mmc_detach_bus(host); 1068 mmc_power_off(host); 1069 mmc_release_host(host); 1070 } 1071 } 1072 1073 /* 1074 * Suspend callback from host. 1075 */ 1076 static int mmc_sd_suspend(struct mmc_host *host) 1077 { 1078 BUG_ON(!host); 1079 BUG_ON(!host->card); 1080 1081 mmc_claim_host(host); 1082 if (!mmc_host_is_spi(host)) 1083 mmc_deselect_cards(host); 1084 host->card->state &= ~MMC_STATE_HIGHSPEED; 1085 mmc_release_host(host); 1086 1087 return 0; 1088 } 1089 1090 /* 1091 * Resume callback from host. 1092 * 1093 * This function tries to determine if the same card is still present 1094 * and, if so, restore all state to it. 1095 */ 1096 static int mmc_sd_resume(struct mmc_host *host) 1097 { 1098 int err; 1099 1100 BUG_ON(!host); 1101 BUG_ON(!host->card); 1102 1103 mmc_claim_host(host); 1104 err = mmc_sd_init_card(host, host->ocr, host->card); 1105 mmc_release_host(host); 1106 1107 return err; 1108 } 1109 1110 static int mmc_sd_power_restore(struct mmc_host *host) 1111 { 1112 int ret; 1113 1114 host->card->state &= ~MMC_STATE_HIGHSPEED; 1115 mmc_claim_host(host); 1116 ret = mmc_sd_init_card(host, host->ocr, host->card); 1117 mmc_release_host(host); 1118 1119 return ret; 1120 } 1121 1122 static const struct mmc_bus_ops mmc_sd_ops = { 1123 .remove = mmc_sd_remove, 1124 .detect = mmc_sd_detect, 1125 .suspend = NULL, 1126 .resume = NULL, 1127 .power_restore = mmc_sd_power_restore, 1128 .alive = mmc_sd_alive, 1129 }; 1130 1131 static const struct mmc_bus_ops mmc_sd_ops_unsafe = { 1132 .remove = mmc_sd_remove, 1133 .detect = mmc_sd_detect, 1134 .suspend = mmc_sd_suspend, 1135 .resume = mmc_sd_resume, 1136 .power_restore = mmc_sd_power_restore, 1137 .alive = mmc_sd_alive, 1138 }; 1139 1140 static void mmc_sd_attach_bus_ops(struct mmc_host *host) 1141 { 1142 const struct mmc_bus_ops *bus_ops; 1143 1144 if (!mmc_card_is_removable(host)) 1145 bus_ops = &mmc_sd_ops_unsafe; 1146 else 1147 bus_ops = &mmc_sd_ops; 1148 mmc_attach_bus(host, bus_ops); 1149 } 1150 1151 /* 1152 * Starting point for SD card init. 1153 */ 1154 int mmc_attach_sd(struct mmc_host *host) 1155 { 1156 int err; 1157 u32 ocr; 1158 1159 BUG_ON(!host); 1160 WARN_ON(!host->claimed); 1161 1162 /* Disable preset value enable if already set since last time */ 1163 if (host->ops->enable_preset_value) { 1164 mmc_host_clk_hold(host); 1165 host->ops->enable_preset_value(host, false); 1166 mmc_host_clk_release(host); 1167 } 1168 1169 err = mmc_send_app_op_cond(host, 0, &ocr); 1170 if (err) 1171 return err; 1172 1173 mmc_sd_attach_bus_ops(host); 1174 if (host->ocr_avail_sd) 1175 host->ocr_avail = host->ocr_avail_sd; 1176 1177 /* 1178 * We need to get OCR a different way for SPI. 1179 */ 1180 if (mmc_host_is_spi(host)) { 1181 mmc_go_idle(host); 1182 1183 err = mmc_spi_read_ocr(host, 0, &ocr); 1184 if (err) 1185 goto err; 1186 } 1187 1188 /* 1189 * Sanity check the voltages that the card claims to 1190 * support. 1191 */ 1192 if (ocr & 0x7F) { 1193 pr_warning("%s: card claims to support voltages " 1194 "below the defined range. These will be ignored.\n", 1195 mmc_hostname(host)); 1196 ocr &= ~0x7F; 1197 } 1198 1199 if ((ocr & MMC_VDD_165_195) && 1200 !(host->ocr_avail_sd & MMC_VDD_165_195)) { 1201 pr_warning("%s: SD card claims to support the " 1202 "incompletely defined 'low voltage range'. This " 1203 "will be ignored.\n", mmc_hostname(host)); 1204 ocr &= ~MMC_VDD_165_195; 1205 } 1206 1207 host->ocr = mmc_select_voltage(host, ocr); 1208 1209 /* 1210 * Can we support the voltage(s) of the card(s)? 1211 */ 1212 if (!host->ocr) { 1213 err = -EINVAL; 1214 goto err; 1215 } 1216 1217 /* 1218 * Detect and init the card. 1219 */ 1220 err = mmc_sd_init_card(host, host->ocr, NULL); 1221 if (err) 1222 goto err; 1223 1224 mmc_release_host(host); 1225 err = mmc_add_card(host->card); 1226 mmc_claim_host(host); 1227 if (err) 1228 goto remove_card; 1229 1230 return 0; 1231 1232 remove_card: 1233 mmc_release_host(host); 1234 mmc_remove_card(host->card); 1235 host->card = NULL; 1236 mmc_claim_host(host); 1237 err: 1238 mmc_detach_bus(host); 1239 1240 pr_err("%s: error %d whilst initialising SD card\n", 1241 mmc_hostname(host), err); 1242 1243 return err; 1244 } 1245 1246