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 drive_strength = card->host->ops->select_drive_strength( 455 card->sw_caps.uhs_max_dtr, 456 host_drv_type, card_drv_type); 457 458 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 459 if (err) 460 return err; 461 462 if ((status[15] & 0xF) != drive_strength) { 463 pr_warning("%s: Problem setting drive strength!\n", 464 mmc_hostname(card->host)); 465 return 0; 466 } 467 468 mmc_set_driver_type(card->host, drive_strength); 469 470 return 0; 471 } 472 473 static void sd_update_bus_speed_mode(struct mmc_card *card) 474 { 475 /* 476 * If the host doesn't support any of the UHS-I modes, fallback on 477 * default speed. 478 */ 479 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 480 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) { 481 card->sd_bus_speed = 0; 482 return; 483 } 484 485 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 486 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 487 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 488 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 489 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 490 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 491 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 492 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 493 SD_MODE_UHS_SDR50)) { 494 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 495 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 496 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 497 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 498 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 499 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 500 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 501 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 502 SD_MODE_UHS_SDR12)) { 503 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 504 } 505 } 506 507 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 508 { 509 int err; 510 unsigned int timing = 0; 511 512 switch (card->sd_bus_speed) { 513 case UHS_SDR104_BUS_SPEED: 514 timing = MMC_TIMING_UHS_SDR104; 515 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 516 break; 517 case UHS_DDR50_BUS_SPEED: 518 timing = MMC_TIMING_UHS_DDR50; 519 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 520 break; 521 case UHS_SDR50_BUS_SPEED: 522 timing = MMC_TIMING_UHS_SDR50; 523 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 524 break; 525 case UHS_SDR25_BUS_SPEED: 526 timing = MMC_TIMING_UHS_SDR25; 527 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 528 break; 529 case UHS_SDR12_BUS_SPEED: 530 timing = MMC_TIMING_UHS_SDR12; 531 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 532 break; 533 default: 534 return 0; 535 } 536 537 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 538 if (err) 539 return err; 540 541 if ((status[16] & 0xF) != card->sd_bus_speed) 542 pr_warning("%s: Problem setting bus speed mode!\n", 543 mmc_hostname(card->host)); 544 else { 545 mmc_set_timing(card->host, timing); 546 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 547 } 548 549 return 0; 550 } 551 552 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 553 { 554 int current_limit = 0; 555 int err; 556 557 /* 558 * Current limit switch is only defined for SDR50, SDR104, and DDR50 559 * bus speed modes. For other bus speed modes, we set the default 560 * current limit of 200mA. 561 */ 562 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) || 563 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) || 564 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) { 565 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) { 566 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) 567 current_limit = SD_SET_CURRENT_LIMIT_800; 568 else if (card->sw_caps.sd3_curr_limit & 569 SD_MAX_CURRENT_600) 570 current_limit = SD_SET_CURRENT_LIMIT_600; 571 else if (card->sw_caps.sd3_curr_limit & 572 SD_MAX_CURRENT_400) 573 current_limit = SD_SET_CURRENT_LIMIT_400; 574 else if (card->sw_caps.sd3_curr_limit & 575 SD_MAX_CURRENT_200) 576 current_limit = SD_SET_CURRENT_LIMIT_200; 577 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) { 578 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) 579 current_limit = SD_SET_CURRENT_LIMIT_600; 580 else if (card->sw_caps.sd3_curr_limit & 581 SD_MAX_CURRENT_400) 582 current_limit = SD_SET_CURRENT_LIMIT_400; 583 else if (card->sw_caps.sd3_curr_limit & 584 SD_MAX_CURRENT_200) 585 current_limit = SD_SET_CURRENT_LIMIT_200; 586 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) { 587 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) 588 current_limit = SD_SET_CURRENT_LIMIT_400; 589 else if (card->sw_caps.sd3_curr_limit & 590 SD_MAX_CURRENT_200) 591 current_limit = SD_SET_CURRENT_LIMIT_200; 592 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) { 593 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) 594 current_limit = SD_SET_CURRENT_LIMIT_200; 595 } 596 } else 597 current_limit = SD_SET_CURRENT_LIMIT_200; 598 599 err = mmc_sd_switch(card, 1, 3, current_limit, status); 600 if (err) 601 return err; 602 603 if (((status[15] >> 4) & 0x0F) != current_limit) 604 pr_warning("%s: Problem setting current limit!\n", 605 mmc_hostname(card->host)); 606 607 return 0; 608 } 609 610 /* 611 * UHS-I specific initialization procedure 612 */ 613 static int mmc_sd_init_uhs_card(struct mmc_card *card) 614 { 615 int err; 616 u8 *status; 617 618 if (!card->scr.sda_spec3) 619 return 0; 620 621 if (!(card->csd.cmdclass & CCC_SWITCH)) 622 return 0; 623 624 status = kmalloc(64, GFP_KERNEL); 625 if (!status) { 626 pr_err("%s: could not allocate a buffer for " 627 "switch capabilities.\n", mmc_hostname(card->host)); 628 return -ENOMEM; 629 } 630 631 /* Set 4-bit bus width */ 632 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 633 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 634 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 635 if (err) 636 goto out; 637 638 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 639 } 640 641 /* 642 * Select the bus speed mode depending on host 643 * and card capability. 644 */ 645 sd_update_bus_speed_mode(card); 646 647 /* Set the driver strength for the card */ 648 err = sd_select_driver_type(card, status); 649 if (err) 650 goto out; 651 652 /* Set current limit for the card */ 653 err = sd_set_current_limit(card, status); 654 if (err) 655 goto out; 656 657 /* Set bus speed mode of the card */ 658 err = sd_set_bus_speed_mode(card, status); 659 if (err) 660 goto out; 661 662 /* SPI mode doesn't define CMD19 */ 663 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) 664 err = card->host->ops->execute_tuning(card->host, 665 MMC_SEND_TUNING_BLOCK); 666 667 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 }; 704 705 static struct attribute_group sd_std_attr_group = { 706 .attrs = sd_std_attrs, 707 }; 708 709 static const struct attribute_group *sd_attr_groups[] = { 710 &sd_std_attr_group, 711 NULL, 712 }; 713 714 struct device_type sd_type = { 715 .groups = sd_attr_groups, 716 }; 717 718 /* 719 * Fetch CID from card. 720 */ 721 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 722 { 723 int err; 724 725 /* 726 * Since we're changing the OCR value, we seem to 727 * need to tell some cards to go back to the idle 728 * state. We wait 1ms to give cards time to 729 * respond. 730 */ 731 mmc_go_idle(host); 732 733 /* 734 * If SD_SEND_IF_COND indicates an SD 2.0 735 * compliant card and we should set bit 30 736 * of the ocr to indicate that we can handle 737 * block-addressed SDHC cards. 738 */ 739 err = mmc_send_if_cond(host, ocr); 740 if (!err) 741 ocr |= SD_OCR_CCS; 742 743 /* 744 * If the host supports one of UHS-I modes, request the card 745 * to switch to 1.8V signaling level. 746 */ 747 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 748 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)) 749 ocr |= SD_OCR_S18R; 750 751 /* If the host can supply more than 150mA, XPC should be set to 1. */ 752 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 | 753 MMC_CAP_SET_XPC_180)) 754 ocr |= SD_OCR_XPC; 755 756 try_again: 757 err = mmc_send_app_op_cond(host, ocr, rocr); 758 if (err) 759 return err; 760 761 /* 762 * In case CCS and S18A in the response is set, start Signal Voltage 763 * Switch procedure. SPI mode doesn't support CMD11. 764 */ 765 if (!mmc_host_is_spi(host) && rocr && 766 ((*rocr & 0x41000000) == 0x41000000)) { 767 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true); 768 if (err) { 769 ocr &= ~SD_OCR_S18R; 770 goto try_again; 771 } 772 } 773 774 if (mmc_host_is_spi(host)) 775 err = mmc_send_cid(host, cid); 776 else 777 err = mmc_all_send_cid(host, cid); 778 779 return err; 780 } 781 782 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 783 { 784 int err; 785 786 /* 787 * Fetch CSD from card. 788 */ 789 err = mmc_send_csd(card, card->raw_csd); 790 if (err) 791 return err; 792 793 err = mmc_decode_csd(card); 794 if (err) 795 return err; 796 797 return 0; 798 } 799 800 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 801 bool reinit) 802 { 803 int err; 804 805 if (!reinit) { 806 /* 807 * Fetch SCR from card. 808 */ 809 err = mmc_app_send_scr(card, card->raw_scr); 810 if (err) 811 return err; 812 813 err = mmc_decode_scr(card); 814 if (err) 815 return err; 816 817 /* 818 * Fetch and process SD Status register. 819 */ 820 err = mmc_read_ssr(card); 821 if (err) 822 return err; 823 824 /* Erase init depends on CSD and SSR */ 825 mmc_init_erase(card); 826 827 /* 828 * Fetch switch information from card. 829 */ 830 err = mmc_read_switch(card); 831 if (err) 832 return err; 833 } 834 835 /* 836 * For SPI, enable CRC as appropriate. 837 * This CRC enable is located AFTER the reading of the 838 * card registers because some SDHC cards are not able 839 * to provide valid CRCs for non-512-byte blocks. 840 */ 841 if (mmc_host_is_spi(host)) { 842 err = mmc_spi_set_crc(host, use_spi_crc); 843 if (err) 844 return err; 845 } 846 847 /* 848 * Check if read-only switch is active. 849 */ 850 if (!reinit) { 851 int ro = -1; 852 853 if (host->ops->get_ro) 854 ro = host->ops->get_ro(host); 855 856 if (ro < 0) { 857 pr_warning("%s: host does not " 858 "support reading read-only " 859 "switch. assuming write-enable.\n", 860 mmc_hostname(host)); 861 } else if (ro > 0) { 862 mmc_card_set_readonly(card); 863 } 864 } 865 866 return 0; 867 } 868 869 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 870 { 871 unsigned max_dtr = (unsigned int)-1; 872 873 if (mmc_card_highspeed(card)) { 874 if (max_dtr > card->sw_caps.hs_max_dtr) 875 max_dtr = card->sw_caps.hs_max_dtr; 876 } else if (max_dtr > card->csd.max_dtr) { 877 max_dtr = card->csd.max_dtr; 878 } 879 880 return max_dtr; 881 } 882 883 void mmc_sd_go_highspeed(struct mmc_card *card) 884 { 885 mmc_card_set_highspeed(card); 886 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 887 } 888 889 /* 890 * Handle the detection and initialisation of a card. 891 * 892 * In the case of a resume, "oldcard" will contain the card 893 * we're trying to reinitialise. 894 */ 895 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 896 struct mmc_card *oldcard) 897 { 898 struct mmc_card *card; 899 int err; 900 u32 cid[4]; 901 u32 rocr = 0; 902 903 BUG_ON(!host); 904 WARN_ON(!host->claimed); 905 906 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 907 if (err) 908 return err; 909 910 if (oldcard) { 911 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 912 return -ENOENT; 913 914 card = oldcard; 915 } else { 916 /* 917 * Allocate card structure. 918 */ 919 card = mmc_alloc_card(host, &sd_type); 920 if (IS_ERR(card)) 921 return PTR_ERR(card); 922 923 card->type = MMC_TYPE_SD; 924 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 925 } 926 927 /* 928 * For native busses: get card RCA and quit open drain mode. 929 */ 930 if (!mmc_host_is_spi(host)) { 931 err = mmc_send_relative_addr(host, &card->rca); 932 if (err) 933 return err; 934 } 935 936 if (!oldcard) { 937 err = mmc_sd_get_csd(host, card); 938 if (err) 939 return err; 940 941 mmc_decode_cid(card); 942 } 943 944 /* 945 * Select card, as all following commands rely on that. 946 */ 947 if (!mmc_host_is_spi(host)) { 948 err = mmc_select_card(card); 949 if (err) 950 return err; 951 } 952 953 err = mmc_sd_setup_card(host, card, oldcard != NULL); 954 if (err) 955 goto free_card; 956 957 /* Initialization sequence for UHS-I cards */ 958 if (rocr & SD_ROCR_S18A) { 959 err = mmc_sd_init_uhs_card(card); 960 if (err) 961 goto free_card; 962 963 /* Card is an ultra-high-speed card */ 964 mmc_card_set_uhs(card); 965 966 /* 967 * Since initialization is now complete, enable preset 968 * value registers for UHS-I cards. 969 */ 970 if (host->ops->enable_preset_value) 971 host->ops->enable_preset_value(host, true); 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 BUG_ON(!host); 1065 BUG_ON(!host->card); 1066 1067 mmc_claim_host(host); 1068 if (!mmc_host_is_spi(host)) 1069 mmc_deselect_cards(host); 1070 host->card->state &= ~MMC_STATE_HIGHSPEED; 1071 mmc_release_host(host); 1072 1073 return 0; 1074 } 1075 1076 /* 1077 * Resume callback from host. 1078 * 1079 * This function tries to determine if the same card is still present 1080 * and, if so, restore all state to it. 1081 */ 1082 static int mmc_sd_resume(struct mmc_host *host) 1083 { 1084 int err; 1085 1086 BUG_ON(!host); 1087 BUG_ON(!host->card); 1088 1089 mmc_claim_host(host); 1090 err = mmc_sd_init_card(host, host->ocr, host->card); 1091 mmc_release_host(host); 1092 1093 return err; 1094 } 1095 1096 static int mmc_sd_power_restore(struct mmc_host *host) 1097 { 1098 int ret; 1099 1100 host->card->state &= ~MMC_STATE_HIGHSPEED; 1101 mmc_claim_host(host); 1102 ret = mmc_sd_init_card(host, host->ocr, host->card); 1103 mmc_release_host(host); 1104 1105 return ret; 1106 } 1107 1108 static const struct mmc_bus_ops mmc_sd_ops = { 1109 .remove = mmc_sd_remove, 1110 .detect = mmc_sd_detect, 1111 .suspend = NULL, 1112 .resume = NULL, 1113 .power_restore = mmc_sd_power_restore, 1114 .alive = mmc_sd_alive, 1115 }; 1116 1117 static const struct mmc_bus_ops mmc_sd_ops_unsafe = { 1118 .remove = mmc_sd_remove, 1119 .detect = mmc_sd_detect, 1120 .suspend = mmc_sd_suspend, 1121 .resume = mmc_sd_resume, 1122 .power_restore = mmc_sd_power_restore, 1123 .alive = mmc_sd_alive, 1124 }; 1125 1126 static void mmc_sd_attach_bus_ops(struct mmc_host *host) 1127 { 1128 const struct mmc_bus_ops *bus_ops; 1129 1130 if (!mmc_card_is_removable(host)) 1131 bus_ops = &mmc_sd_ops_unsafe; 1132 else 1133 bus_ops = &mmc_sd_ops; 1134 mmc_attach_bus(host, bus_ops); 1135 } 1136 1137 /* 1138 * Starting point for SD card init. 1139 */ 1140 int mmc_attach_sd(struct mmc_host *host) 1141 { 1142 int err; 1143 u32 ocr; 1144 1145 BUG_ON(!host); 1146 WARN_ON(!host->claimed); 1147 1148 /* Make sure we are at 3.3V signalling voltage */ 1149 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false); 1150 if (err) 1151 return err; 1152 1153 /* Disable preset value enable if already set since last time */ 1154 if (host->ops->enable_preset_value) 1155 host->ops->enable_preset_value(host, false); 1156 1157 err = mmc_send_app_op_cond(host, 0, &ocr); 1158 if (err) 1159 return err; 1160 1161 mmc_sd_attach_bus_ops(host); 1162 if (host->ocr_avail_sd) 1163 host->ocr_avail = host->ocr_avail_sd; 1164 1165 /* 1166 * We need to get OCR a different way for SPI. 1167 */ 1168 if (mmc_host_is_spi(host)) { 1169 mmc_go_idle(host); 1170 1171 err = mmc_spi_read_ocr(host, 0, &ocr); 1172 if (err) 1173 goto err; 1174 } 1175 1176 /* 1177 * Sanity check the voltages that the card claims to 1178 * support. 1179 */ 1180 if (ocr & 0x7F) { 1181 pr_warning("%s: card claims to support voltages " 1182 "below the defined range. These will be ignored.\n", 1183 mmc_hostname(host)); 1184 ocr &= ~0x7F; 1185 } 1186 1187 if ((ocr & MMC_VDD_165_195) && 1188 !(host->ocr_avail_sd & MMC_VDD_165_195)) { 1189 pr_warning("%s: SD card claims to support the " 1190 "incompletely defined 'low voltage range'. This " 1191 "will be ignored.\n", mmc_hostname(host)); 1192 ocr &= ~MMC_VDD_165_195; 1193 } 1194 1195 host->ocr = mmc_select_voltage(host, ocr); 1196 1197 /* 1198 * Can we support the voltage(s) of the card(s)? 1199 */ 1200 if (!host->ocr) { 1201 err = -EINVAL; 1202 goto err; 1203 } 1204 1205 /* 1206 * Detect and init the card. 1207 */ 1208 err = mmc_sd_init_card(host, host->ocr, NULL); 1209 if (err) 1210 goto err; 1211 1212 mmc_release_host(host); 1213 err = mmc_add_card(host->card); 1214 mmc_claim_host(host); 1215 if (err) 1216 goto remove_card; 1217 1218 return 0; 1219 1220 remove_card: 1221 mmc_release_host(host); 1222 mmc_remove_card(host->card); 1223 host->card = NULL; 1224 mmc_claim_host(host); 1225 err: 1226 mmc_detach_bus(host); 1227 1228 pr_err("%s: error %d whilst initialising SD card\n", 1229 mmc_hostname(host), err); 1230 1231 return err; 1232 } 1233 1234