1 /* 2 * linux/drivers/mmc/core/sd.c 3 * 4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved. 5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. 6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/err.h> 14 #include <linux/sizes.h> 15 #include <linux/slab.h> 16 #include <linux/stat.h> 17 #include <linux/pm_runtime.h> 18 19 #include <linux/mmc/host.h> 20 #include <linux/mmc/card.h> 21 #include <linux/mmc/mmc.h> 22 #include <linux/mmc/sd.h> 23 24 #include "core.h" 25 #include "bus.h" 26 #include "mmc_ops.h" 27 #include "sd.h" 28 #include "sd_ops.h" 29 30 static const unsigned int tran_exp[] = { 31 10000, 100000, 1000000, 10000000, 32 0, 0, 0, 0 33 }; 34 35 static const unsigned char tran_mant[] = { 36 0, 10, 12, 13, 15, 20, 25, 30, 37 35, 40, 45, 50, 55, 60, 70, 80, 38 }; 39 40 static const unsigned int tacc_exp[] = { 41 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 42 }; 43 44 static const unsigned int tacc_mant[] = { 45 0, 10, 12, 13, 15, 20, 25, 30, 46 35, 40, 45, 50, 55, 60, 70, 80, 47 }; 48 49 static const unsigned int sd_au_size[] = { 50 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512, 51 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512, 52 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512, 53 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512, 54 }; 55 56 #define UNSTUFF_BITS(resp,start,size) \ 57 ({ \ 58 const int __size = size; \ 59 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 60 const int __off = 3 - ((start) / 32); \ 61 const int __shft = (start) & 31; \ 62 u32 __res; \ 63 \ 64 __res = resp[__off] >> __shft; \ 65 if (__size + __shft > 32) \ 66 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 67 __res & __mask; \ 68 }) 69 70 /* 71 * Given the decoded CSD structure, decode the raw CID to our CID structure. 72 */ 73 void mmc_decode_cid(struct mmc_card *card) 74 { 75 u32 *resp = card->raw_cid; 76 77 memset(&card->cid, 0, sizeof(struct mmc_cid)); 78 79 /* 80 * SD doesn't currently have a version field so we will 81 * have to assume we can parse this. 82 */ 83 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 84 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 85 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 86 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 87 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 88 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 89 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 90 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); 91 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); 92 card->cid.serial = UNSTUFF_BITS(resp, 24, 32); 93 card->cid.year = UNSTUFF_BITS(resp, 12, 8); 94 card->cid.month = UNSTUFF_BITS(resp, 8, 4); 95 96 card->cid.year += 2000; /* SD cards year offset */ 97 } 98 99 /* 100 * Given a 128-bit response, decode to our card CSD structure. 101 */ 102 static int mmc_decode_csd(struct mmc_card *card) 103 { 104 struct mmc_csd *csd = &card->csd; 105 unsigned int e, m, csd_struct; 106 u32 *resp = card->raw_csd; 107 108 csd_struct = UNSTUFF_BITS(resp, 126, 2); 109 110 switch (csd_struct) { 111 case 0: 112 m = UNSTUFF_BITS(resp, 115, 4); 113 e = UNSTUFF_BITS(resp, 112, 3); 114 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 115 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 116 117 m = UNSTUFF_BITS(resp, 99, 4); 118 e = UNSTUFF_BITS(resp, 96, 3); 119 csd->max_dtr = tran_exp[e] * tran_mant[m]; 120 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 121 122 e = UNSTUFF_BITS(resp, 47, 3); 123 m = UNSTUFF_BITS(resp, 62, 12); 124 csd->capacity = (1 + m) << (e + 2); 125 126 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 127 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 128 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 129 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 130 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 131 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 132 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 133 134 if (UNSTUFF_BITS(resp, 46, 1)) { 135 csd->erase_size = 1; 136 } else if (csd->write_blkbits >= 9) { 137 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; 138 csd->erase_size <<= csd->write_blkbits - 9; 139 } 140 break; 141 case 1: 142 /* 143 * This is a block-addressed SDHC or SDXC card. Most 144 * interesting fields are unused and have fixed 145 * values. To avoid getting tripped by buggy cards, 146 * we assume those fixed values ourselves. 147 */ 148 mmc_card_set_blockaddr(card); 149 150 csd->tacc_ns = 0; /* Unused */ 151 csd->tacc_clks = 0; /* Unused */ 152 153 m = UNSTUFF_BITS(resp, 99, 4); 154 e = UNSTUFF_BITS(resp, 96, 3); 155 csd->max_dtr = tran_exp[e] * tran_mant[m]; 156 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 157 csd->c_size = UNSTUFF_BITS(resp, 48, 22); 158 159 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */ 160 if (csd->c_size >= 0xFFFF) 161 mmc_card_set_ext_capacity(card); 162 163 m = UNSTUFF_BITS(resp, 48, 22); 164 csd->capacity = (1 + m) << 10; 165 166 csd->read_blkbits = 9; 167 csd->read_partial = 0; 168 csd->write_misalign = 0; 169 csd->read_misalign = 0; 170 csd->r2w_factor = 4; /* Unused */ 171 csd->write_blkbits = 9; 172 csd->write_partial = 0; 173 csd->erase_size = 1; 174 break; 175 default: 176 pr_err("%s: unrecognised CSD structure version %d\n", 177 mmc_hostname(card->host), csd_struct); 178 return -EINVAL; 179 } 180 181 card->erase_size = csd->erase_size; 182 183 return 0; 184 } 185 186 /* 187 * Given a 64-bit response, decode to our card SCR structure. 188 */ 189 static int mmc_decode_scr(struct mmc_card *card) 190 { 191 struct sd_scr *scr = &card->scr; 192 unsigned int scr_struct; 193 u32 resp[4]; 194 195 resp[3] = card->raw_scr[1]; 196 resp[2] = card->raw_scr[0]; 197 198 scr_struct = UNSTUFF_BITS(resp, 60, 4); 199 if (scr_struct != 0) { 200 pr_err("%s: unrecognised SCR structure version %d\n", 201 mmc_hostname(card->host), scr_struct); 202 return -EINVAL; 203 } 204 205 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 206 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 207 if (scr->sda_vsn == SCR_SPEC_VER_2) 208 /* Check if Physical Layer Spec v3.0 is supported */ 209 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); 210 211 if (UNSTUFF_BITS(resp, 55, 1)) 212 card->erased_byte = 0xFF; 213 else 214 card->erased_byte = 0x0; 215 216 if (scr->sda_spec3) 217 scr->cmds = UNSTUFF_BITS(resp, 32, 2); 218 return 0; 219 } 220 221 /* 222 * Fetch and process SD Status register. 223 */ 224 static int mmc_read_ssr(struct mmc_card *card) 225 { 226 unsigned int au, es, et, eo; 227 int err, i; 228 u32 *ssr; 229 230 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 231 pr_warning("%s: card lacks mandatory SD Status " 232 "function.\n", mmc_hostname(card->host)); 233 return 0; 234 } 235 236 ssr = kmalloc(64, GFP_KERNEL); 237 if (!ssr) 238 return -ENOMEM; 239 240 err = mmc_app_sd_status(card, ssr); 241 if (err) { 242 pr_warning("%s: problem reading SD Status " 243 "register.\n", mmc_hostname(card->host)); 244 err = 0; 245 goto out; 246 } 247 248 for (i = 0; i < 16; i++) 249 ssr[i] = be32_to_cpu(ssr[i]); 250 251 /* 252 * UNSTUFF_BITS only works with four u32s so we have to offset the 253 * bitfield positions accordingly. 254 */ 255 au = UNSTUFF_BITS(ssr, 428 - 384, 4); 256 if (au) { 257 if (au <= 9 || card->scr.sda_spec3) { 258 card->ssr.au = sd_au_size[au]; 259 es = UNSTUFF_BITS(ssr, 408 - 384, 16); 260 et = UNSTUFF_BITS(ssr, 402 - 384, 6); 261 if (es && et) { 262 eo = UNSTUFF_BITS(ssr, 400 - 384, 2); 263 card->ssr.erase_timeout = (et * 1000) / es; 264 card->ssr.erase_offset = eo * 1000; 265 } 266 } else { 267 pr_warning("%s: SD Status: Invalid Allocation Unit size.\n", 268 mmc_hostname(card->host)); 269 } 270 } 271 out: 272 kfree(ssr); 273 return err; 274 } 275 276 /* 277 * Fetches and decodes switch information 278 */ 279 static int mmc_read_switch(struct mmc_card *card) 280 { 281 int err; 282 u8 *status; 283 284 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 285 return 0; 286 287 if (!(card->csd.cmdclass & CCC_SWITCH)) { 288 pr_warning("%s: card lacks mandatory switch " 289 "function, performance might suffer.\n", 290 mmc_hostname(card->host)); 291 return 0; 292 } 293 294 err = -EIO; 295 296 status = kmalloc(64, GFP_KERNEL); 297 if (!status) { 298 pr_err("%s: could not allocate a buffer for " 299 "switch capabilities.\n", 300 mmc_hostname(card->host)); 301 return -ENOMEM; 302 } 303 304 /* 305 * Find out the card's support bits with a mode 0 operation. 306 * The argument does not matter, as the support bits do not 307 * change with the arguments. 308 */ 309 err = mmc_sd_switch(card, 0, 0, 0, status); 310 if (err) { 311 /* 312 * If the host or the card can't do the switch, 313 * fail more gracefully. 314 */ 315 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 316 goto out; 317 318 pr_warning("%s: problem reading Bus Speed modes.\n", 319 mmc_hostname(card->host)); 320 err = 0; 321 322 goto out; 323 } 324 325 if (status[13] & SD_MODE_HIGH_SPEED) 326 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; 327 328 if (card->scr.sda_spec3) { 329 card->sw_caps.sd3_bus_mode = status[13]; 330 /* Driver Strengths supported by the card */ 331 card->sw_caps.sd3_drv_type = status[9]; 332 } 333 334 out: 335 kfree(status); 336 337 return err; 338 } 339 340 /* 341 * Test if the card supports high-speed mode and, if so, switch to it. 342 */ 343 int mmc_sd_switch_hs(struct mmc_card *card) 344 { 345 int err; 346 u8 *status; 347 348 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 349 return 0; 350 351 if (!(card->csd.cmdclass & CCC_SWITCH)) 352 return 0; 353 354 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 355 return 0; 356 357 if (card->sw_caps.hs_max_dtr == 0) 358 return 0; 359 360 err = -EIO; 361 362 status = kmalloc(64, GFP_KERNEL); 363 if (!status) { 364 pr_err("%s: could not allocate a buffer for " 365 "switch capabilities.\n", mmc_hostname(card->host)); 366 return -ENOMEM; 367 } 368 369 err = mmc_sd_switch(card, 1, 0, 1, status); 370 if (err) 371 goto out; 372 373 if ((status[16] & 0xF) != 1) { 374 pr_warning("%s: Problem switching card " 375 "into high-speed mode!\n", 376 mmc_hostname(card->host)); 377 err = 0; 378 } else { 379 err = 1; 380 } 381 382 out: 383 kfree(status); 384 385 return err; 386 } 387 388 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 389 { 390 int host_drv_type = SD_DRIVER_TYPE_B; 391 int card_drv_type = SD_DRIVER_TYPE_B; 392 int drive_strength; 393 int err; 394 395 /* 396 * If the host doesn't support any of the Driver Types A,C or D, 397 * or there is no board specific handler then default Driver 398 * Type B is used. 399 */ 400 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C 401 | MMC_CAP_DRIVER_TYPE_D))) 402 return 0; 403 404 if (!card->host->ops->select_drive_strength) 405 return 0; 406 407 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) 408 host_drv_type |= SD_DRIVER_TYPE_A; 409 410 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) 411 host_drv_type |= SD_DRIVER_TYPE_C; 412 413 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) 414 host_drv_type |= SD_DRIVER_TYPE_D; 415 416 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) 417 card_drv_type |= SD_DRIVER_TYPE_A; 418 419 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 420 card_drv_type |= SD_DRIVER_TYPE_C; 421 422 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D) 423 card_drv_type |= SD_DRIVER_TYPE_D; 424 425 /* 426 * The drive strength that the hardware can support 427 * depends on the board design. Pass the appropriate 428 * information and let the hardware specific code 429 * return what is possible given the options 430 */ 431 mmc_host_clk_hold(card->host); 432 drive_strength = card->host->ops->select_drive_strength( 433 card->sw_caps.uhs_max_dtr, 434 host_drv_type, card_drv_type); 435 mmc_host_clk_release(card->host); 436 437 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 438 if (err) 439 return err; 440 441 if ((status[15] & 0xF) != drive_strength) { 442 pr_warning("%s: Problem setting drive strength!\n", 443 mmc_hostname(card->host)); 444 return 0; 445 } 446 447 mmc_set_driver_type(card->host, drive_strength); 448 449 return 0; 450 } 451 452 static void sd_update_bus_speed_mode(struct mmc_card *card) 453 { 454 /* 455 * If the host doesn't support any of the UHS-I modes, fallback on 456 * default speed. 457 */ 458 if (!mmc_host_uhs(card->host)) { 459 card->sd_bus_speed = 0; 460 return; 461 } 462 463 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 464 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 465 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 466 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 467 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 468 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 469 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 470 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 471 SD_MODE_UHS_SDR50)) { 472 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 473 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 474 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 475 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 476 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 477 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 478 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 479 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 480 SD_MODE_UHS_SDR12)) { 481 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 482 } 483 } 484 485 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 486 { 487 int err; 488 unsigned int timing = 0; 489 490 switch (card->sd_bus_speed) { 491 case UHS_SDR104_BUS_SPEED: 492 timing = MMC_TIMING_UHS_SDR104; 493 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 494 break; 495 case UHS_DDR50_BUS_SPEED: 496 timing = MMC_TIMING_UHS_DDR50; 497 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 498 break; 499 case UHS_SDR50_BUS_SPEED: 500 timing = MMC_TIMING_UHS_SDR50; 501 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 502 break; 503 case UHS_SDR25_BUS_SPEED: 504 timing = MMC_TIMING_UHS_SDR25; 505 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 506 break; 507 case UHS_SDR12_BUS_SPEED: 508 timing = MMC_TIMING_UHS_SDR12; 509 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 510 break; 511 default: 512 return 0; 513 } 514 515 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 516 if (err) 517 return err; 518 519 if ((status[16] & 0xF) != card->sd_bus_speed) 520 pr_warning("%s: Problem setting bus speed mode!\n", 521 mmc_hostname(card->host)); 522 else { 523 mmc_set_timing(card->host, timing); 524 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 525 } 526 527 return 0; 528 } 529 530 /* Get host's max current setting at its current voltage */ 531 static u32 sd_get_host_max_current(struct mmc_host *host) 532 { 533 u32 voltage, max_current; 534 535 voltage = 1 << host->ios.vdd; 536 switch (voltage) { 537 case MMC_VDD_165_195: 538 max_current = host->max_current_180; 539 break; 540 case MMC_VDD_29_30: 541 case MMC_VDD_30_31: 542 max_current = host->max_current_300; 543 break; 544 case MMC_VDD_32_33: 545 case MMC_VDD_33_34: 546 max_current = host->max_current_330; 547 break; 548 default: 549 max_current = 0; 550 } 551 552 return max_current; 553 } 554 555 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 556 { 557 int current_limit = SD_SET_CURRENT_NO_CHANGE; 558 int err; 559 u32 max_current; 560 561 /* 562 * Current limit switch is only defined for SDR50, SDR104, and DDR50 563 * bus speed modes. For other bus speed modes, we do not change the 564 * current limit. 565 */ 566 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && 567 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && 568 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) 569 return 0; 570 571 /* 572 * Host has different current capabilities when operating at 573 * different voltages, so find out its max current first. 574 */ 575 max_current = sd_get_host_max_current(card->host); 576 577 /* 578 * We only check host's capability here, if we set a limit that is 579 * higher than the card's maximum current, the card will be using its 580 * maximum current, e.g. if the card's maximum current is 300ma, and 581 * when we set current limit to 200ma, the card will draw 200ma, and 582 * when we set current limit to 400/600/800ma, the card will draw its 583 * maximum 300ma from the host. 584 */ 585 if (max_current >= 800) 586 current_limit = SD_SET_CURRENT_LIMIT_800; 587 else if (max_current >= 600) 588 current_limit = SD_SET_CURRENT_LIMIT_600; 589 else if (max_current >= 400) 590 current_limit = SD_SET_CURRENT_LIMIT_400; 591 else if (max_current >= 200) 592 current_limit = SD_SET_CURRENT_LIMIT_200; 593 594 if (current_limit != SD_SET_CURRENT_NO_CHANGE) { 595 err = mmc_sd_switch(card, 1, 3, current_limit, status); 596 if (err) 597 return err; 598 599 if (((status[15] >> 4) & 0x0F) != current_limit) 600 pr_warning("%s: Problem setting current limit!\n", 601 mmc_hostname(card->host)); 602 603 } 604 605 return 0; 606 } 607 608 /* 609 * UHS-I specific initialization procedure 610 */ 611 static int mmc_sd_init_uhs_card(struct mmc_card *card) 612 { 613 int err; 614 u8 *status; 615 616 if (!card->scr.sda_spec3) 617 return 0; 618 619 if (!(card->csd.cmdclass & CCC_SWITCH)) 620 return 0; 621 622 status = kmalloc(64, GFP_KERNEL); 623 if (!status) { 624 pr_err("%s: could not allocate a buffer for " 625 "switch capabilities.\n", mmc_hostname(card->host)); 626 return -ENOMEM; 627 } 628 629 /* Set 4-bit bus width */ 630 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 631 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 632 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 633 if (err) 634 goto out; 635 636 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 637 } 638 639 /* 640 * Select the bus speed mode depending on host 641 * and card capability. 642 */ 643 sd_update_bus_speed_mode(card); 644 645 /* Set the driver strength for the card */ 646 err = sd_select_driver_type(card, status); 647 if (err) 648 goto out; 649 650 /* Set current limit for the card */ 651 err = sd_set_current_limit(card, status); 652 if (err) 653 goto out; 654 655 /* Set bus speed mode of the card */ 656 err = sd_set_bus_speed_mode(card, status); 657 if (err) 658 goto out; 659 660 /* 661 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 662 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 663 */ 664 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning && 665 (card->sd_bus_speed == UHS_SDR50_BUS_SPEED || 666 card->sd_bus_speed == UHS_SDR104_BUS_SPEED)) { 667 mmc_host_clk_hold(card->host); 668 err = card->host->ops->execute_tuning(card->host, 669 MMC_SEND_TUNING_BLOCK); 670 mmc_host_clk_release(card->host); 671 } 672 673 out: 674 kfree(status); 675 676 return err; 677 } 678 679 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 680 card->raw_cid[2], card->raw_cid[3]); 681 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 682 card->raw_csd[2], card->raw_csd[3]); 683 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 684 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 685 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 686 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 687 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 688 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 689 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 690 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 691 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 692 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 693 694 695 static struct attribute *sd_std_attrs[] = { 696 &dev_attr_cid.attr, 697 &dev_attr_csd.attr, 698 &dev_attr_scr.attr, 699 &dev_attr_date.attr, 700 &dev_attr_erase_size.attr, 701 &dev_attr_preferred_erase_size.attr, 702 &dev_attr_fwrev.attr, 703 &dev_attr_hwrev.attr, 704 &dev_attr_manfid.attr, 705 &dev_attr_name.attr, 706 &dev_attr_oemid.attr, 707 &dev_attr_serial.attr, 708 NULL, 709 }; 710 711 static struct attribute_group sd_std_attr_group = { 712 .attrs = sd_std_attrs, 713 }; 714 715 static const struct attribute_group *sd_attr_groups[] = { 716 &sd_std_attr_group, 717 NULL, 718 }; 719 720 struct device_type sd_type = { 721 .groups = sd_attr_groups, 722 }; 723 724 /* 725 * Fetch CID from card. 726 */ 727 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 728 { 729 int err; 730 u32 max_current; 731 int retries = 10; 732 u32 pocr = ocr; 733 734 try_again: 735 if (!retries) { 736 ocr &= ~SD_OCR_S18R; 737 pr_warning("%s: Skipping voltage switch\n", 738 mmc_hostname(host)); 739 } 740 741 /* 742 * Since we're changing the OCR value, we seem to 743 * need to tell some cards to go back to the idle 744 * state. We wait 1ms to give cards time to 745 * respond. 746 */ 747 mmc_go_idle(host); 748 749 /* 750 * If SD_SEND_IF_COND indicates an SD 2.0 751 * compliant card and we should set bit 30 752 * of the ocr to indicate that we can handle 753 * block-addressed SDHC cards. 754 */ 755 err = mmc_send_if_cond(host, ocr); 756 if (!err) 757 ocr |= SD_OCR_CCS; 758 759 /* 760 * If the host supports one of UHS-I modes, request the card 761 * to switch to 1.8V signaling level. If the card has failed 762 * repeatedly to switch however, skip this. 763 */ 764 if (retries && mmc_host_uhs(host)) 765 ocr |= SD_OCR_S18R; 766 767 /* 768 * If the host can supply more than 150mA at current voltage, 769 * XPC should be set to 1. 770 */ 771 max_current = sd_get_host_max_current(host); 772 if (max_current > 150) 773 ocr |= SD_OCR_XPC; 774 775 err = mmc_send_app_op_cond(host, ocr, rocr); 776 if (err) 777 return err; 778 779 /* 780 * In case CCS and S18A in the response is set, start Signal Voltage 781 * Switch procedure. SPI mode doesn't support CMD11. 782 */ 783 if (!mmc_host_is_spi(host) && rocr && 784 ((*rocr & 0x41000000) == 0x41000000)) { 785 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 786 pocr); 787 if (err == -EAGAIN) { 788 retries--; 789 goto try_again; 790 } else if (err) { 791 retries = 0; 792 goto try_again; 793 } 794 } 795 796 if (mmc_host_is_spi(host)) 797 err = mmc_send_cid(host, cid); 798 else 799 err = mmc_all_send_cid(host, cid); 800 801 return err; 802 } 803 804 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 805 { 806 int err; 807 808 /* 809 * Fetch CSD from card. 810 */ 811 err = mmc_send_csd(card, card->raw_csd); 812 if (err) 813 return err; 814 815 err = mmc_decode_csd(card); 816 if (err) 817 return err; 818 819 return 0; 820 } 821 822 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 823 bool reinit) 824 { 825 int err; 826 827 if (!reinit) { 828 /* 829 * Fetch SCR from card. 830 */ 831 err = mmc_app_send_scr(card, card->raw_scr); 832 if (err) 833 return err; 834 835 err = mmc_decode_scr(card); 836 if (err) 837 return err; 838 839 /* 840 * Fetch and process SD Status register. 841 */ 842 err = mmc_read_ssr(card); 843 if (err) 844 return err; 845 846 /* Erase init depends on CSD and SSR */ 847 mmc_init_erase(card); 848 849 /* 850 * Fetch switch information from card. 851 */ 852 err = mmc_read_switch(card); 853 if (err) 854 return err; 855 } 856 857 /* 858 * For SPI, enable CRC as appropriate. 859 * This CRC enable is located AFTER the reading of the 860 * card registers because some SDHC cards are not able 861 * to provide valid CRCs for non-512-byte blocks. 862 */ 863 if (mmc_host_is_spi(host)) { 864 err = mmc_spi_set_crc(host, use_spi_crc); 865 if (err) 866 return err; 867 } 868 869 /* 870 * Check if read-only switch is active. 871 */ 872 if (!reinit) { 873 int ro = -1; 874 875 if (host->ops->get_ro) { 876 mmc_host_clk_hold(card->host); 877 ro = host->ops->get_ro(host); 878 mmc_host_clk_release(card->host); 879 } 880 881 if (ro < 0) { 882 pr_warning("%s: host does not " 883 "support reading read-only " 884 "switch. assuming write-enable.\n", 885 mmc_hostname(host)); 886 } else if (ro > 0) { 887 mmc_card_set_readonly(card); 888 } 889 } 890 891 return 0; 892 } 893 894 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 895 { 896 unsigned max_dtr = (unsigned int)-1; 897 898 if (mmc_card_highspeed(card)) { 899 if (max_dtr > card->sw_caps.hs_max_dtr) 900 max_dtr = card->sw_caps.hs_max_dtr; 901 } else if (max_dtr > card->csd.max_dtr) { 902 max_dtr = card->csd.max_dtr; 903 } 904 905 return max_dtr; 906 } 907 908 void mmc_sd_go_highspeed(struct mmc_card *card) 909 { 910 mmc_card_set_highspeed(card); 911 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 912 } 913 914 /* 915 * Handle the detection and initialisation of a card. 916 * 917 * In the case of a resume, "oldcard" will contain the card 918 * we're trying to reinitialise. 919 */ 920 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 921 struct mmc_card *oldcard) 922 { 923 struct mmc_card *card; 924 int err; 925 u32 cid[4]; 926 u32 rocr = 0; 927 928 BUG_ON(!host); 929 WARN_ON(!host->claimed); 930 931 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 932 if (err) 933 return err; 934 935 if (oldcard) { 936 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 937 return -ENOENT; 938 939 card = oldcard; 940 } else { 941 /* 942 * Allocate card structure. 943 */ 944 card = mmc_alloc_card(host, &sd_type); 945 if (IS_ERR(card)) 946 return PTR_ERR(card); 947 948 card->ocr = ocr; 949 card->type = MMC_TYPE_SD; 950 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 951 } 952 953 /* 954 * For native busses: get card RCA and quit open drain mode. 955 */ 956 if (!mmc_host_is_spi(host)) { 957 err = mmc_send_relative_addr(host, &card->rca); 958 if (err) 959 goto free_card; 960 } 961 962 if (!oldcard) { 963 err = mmc_sd_get_csd(host, card); 964 if (err) 965 goto free_card; 966 967 mmc_decode_cid(card); 968 } 969 970 /* 971 * Select card, as all following commands rely on that. 972 */ 973 if (!mmc_host_is_spi(host)) { 974 err = mmc_select_card(card); 975 if (err) 976 goto free_card; 977 } 978 979 err = mmc_sd_setup_card(host, card, oldcard != NULL); 980 if (err) 981 goto free_card; 982 983 /* Initialization sequence for UHS-I cards */ 984 if (rocr & SD_ROCR_S18A) { 985 err = mmc_sd_init_uhs_card(card); 986 if (err) 987 goto free_card; 988 989 /* Card is an ultra-high-speed card */ 990 mmc_card_set_uhs(card); 991 } else { 992 /* 993 * Attempt to change to high-speed (if supported) 994 */ 995 err = mmc_sd_switch_hs(card); 996 if (err > 0) 997 mmc_sd_go_highspeed(card); 998 else if (err) 999 goto free_card; 1000 1001 /* 1002 * Set bus speed. 1003 */ 1004 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 1005 1006 /* 1007 * Switch to wider bus (if supported). 1008 */ 1009 if ((host->caps & MMC_CAP_4_BIT_DATA) && 1010 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 1011 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 1012 if (err) 1013 goto free_card; 1014 1015 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1016 } 1017 } 1018 1019 host->card = card; 1020 return 0; 1021 1022 free_card: 1023 if (!oldcard) 1024 mmc_remove_card(card); 1025 1026 return err; 1027 } 1028 1029 /* 1030 * Host is being removed. Free up the current card. 1031 */ 1032 static void mmc_sd_remove(struct mmc_host *host) 1033 { 1034 BUG_ON(!host); 1035 BUG_ON(!host->card); 1036 1037 mmc_remove_card(host->card); 1038 host->card = NULL; 1039 } 1040 1041 /* 1042 * Card detection - card is alive. 1043 */ 1044 static int mmc_sd_alive(struct mmc_host *host) 1045 { 1046 return mmc_send_status(host->card, NULL); 1047 } 1048 1049 /* 1050 * Card detection callback from host. 1051 */ 1052 static void mmc_sd_detect(struct mmc_host *host) 1053 { 1054 int err; 1055 1056 BUG_ON(!host); 1057 BUG_ON(!host->card); 1058 1059 mmc_get_card(host->card); 1060 1061 /* 1062 * Just check if our card has been removed. 1063 */ 1064 err = _mmc_detect_card_removed(host); 1065 1066 mmc_put_card(host->card); 1067 1068 if (err) { 1069 mmc_sd_remove(host); 1070 1071 mmc_claim_host(host); 1072 mmc_detach_bus(host); 1073 mmc_power_off(host); 1074 mmc_release_host(host); 1075 } 1076 } 1077 1078 static int _mmc_sd_suspend(struct mmc_host *host) 1079 { 1080 int err = 0; 1081 1082 BUG_ON(!host); 1083 BUG_ON(!host->card); 1084 1085 mmc_claim_host(host); 1086 1087 if (mmc_card_suspended(host->card)) 1088 goto out; 1089 1090 if (!mmc_host_is_spi(host)) 1091 err = mmc_deselect_cards(host); 1092 host->card->state &= ~MMC_STATE_HIGHSPEED; 1093 if (!err) { 1094 mmc_power_off(host); 1095 mmc_card_set_suspended(host->card); 1096 } 1097 1098 out: 1099 mmc_release_host(host); 1100 return err; 1101 } 1102 1103 /* 1104 * Callback for suspend 1105 */ 1106 static int mmc_sd_suspend(struct mmc_host *host) 1107 { 1108 int err; 1109 1110 err = _mmc_sd_suspend(host); 1111 if (!err) { 1112 pm_runtime_disable(&host->card->dev); 1113 pm_runtime_set_suspended(&host->card->dev); 1114 } 1115 1116 return err; 1117 } 1118 1119 /* 1120 * This function tries to determine if the same card is still present 1121 * and, if so, restore all state to it. 1122 */ 1123 static int _mmc_sd_resume(struct mmc_host *host) 1124 { 1125 int err = 0; 1126 1127 BUG_ON(!host); 1128 BUG_ON(!host->card); 1129 1130 mmc_claim_host(host); 1131 1132 if (!mmc_card_suspended(host->card)) 1133 goto out; 1134 1135 mmc_power_up(host, host->card->ocr); 1136 err = mmc_sd_init_card(host, host->card->ocr, host->card); 1137 mmc_card_clr_suspended(host->card); 1138 1139 out: 1140 mmc_release_host(host); 1141 return err; 1142 } 1143 1144 /* 1145 * Callback for resume 1146 */ 1147 static int mmc_sd_resume(struct mmc_host *host) 1148 { 1149 int err = 0; 1150 1151 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) { 1152 err = _mmc_sd_resume(host); 1153 pm_runtime_set_active(&host->card->dev); 1154 pm_runtime_mark_last_busy(&host->card->dev); 1155 } 1156 pm_runtime_enable(&host->card->dev); 1157 1158 return err; 1159 } 1160 1161 /* 1162 * Callback for runtime_suspend. 1163 */ 1164 static int mmc_sd_runtime_suspend(struct mmc_host *host) 1165 { 1166 int err; 1167 1168 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) 1169 return 0; 1170 1171 err = _mmc_sd_suspend(host); 1172 if (err) 1173 pr_err("%s: error %d doing aggessive suspend\n", 1174 mmc_hostname(host), err); 1175 1176 return err; 1177 } 1178 1179 /* 1180 * Callback for runtime_resume. 1181 */ 1182 static int mmc_sd_runtime_resume(struct mmc_host *host) 1183 { 1184 int err; 1185 1186 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME))) 1187 return 0; 1188 1189 err = _mmc_sd_resume(host); 1190 if (err) 1191 pr_err("%s: error %d doing aggessive resume\n", 1192 mmc_hostname(host), err); 1193 1194 return 0; 1195 } 1196 1197 static int mmc_sd_power_restore(struct mmc_host *host) 1198 { 1199 int ret; 1200 1201 host->card->state &= ~MMC_STATE_HIGHSPEED; 1202 mmc_claim_host(host); 1203 ret = mmc_sd_init_card(host, host->card->ocr, host->card); 1204 mmc_release_host(host); 1205 1206 return ret; 1207 } 1208 1209 static const struct mmc_bus_ops mmc_sd_ops = { 1210 .remove = mmc_sd_remove, 1211 .detect = mmc_sd_detect, 1212 .runtime_suspend = mmc_sd_runtime_suspend, 1213 .runtime_resume = mmc_sd_runtime_resume, 1214 .suspend = mmc_sd_suspend, 1215 .resume = mmc_sd_resume, 1216 .power_restore = mmc_sd_power_restore, 1217 .alive = mmc_sd_alive, 1218 .shutdown = mmc_sd_suspend, 1219 }; 1220 1221 /* 1222 * Starting point for SD card init. 1223 */ 1224 int mmc_attach_sd(struct mmc_host *host) 1225 { 1226 int err; 1227 u32 ocr, rocr; 1228 1229 BUG_ON(!host); 1230 WARN_ON(!host->claimed); 1231 1232 err = mmc_send_app_op_cond(host, 0, &ocr); 1233 if (err) 1234 return err; 1235 1236 mmc_attach_bus(host, &mmc_sd_ops); 1237 if (host->ocr_avail_sd) 1238 host->ocr_avail = host->ocr_avail_sd; 1239 1240 /* 1241 * We need to get OCR a different way for SPI. 1242 */ 1243 if (mmc_host_is_spi(host)) { 1244 mmc_go_idle(host); 1245 1246 err = mmc_spi_read_ocr(host, 0, &ocr); 1247 if (err) 1248 goto err; 1249 } 1250 1251 rocr = mmc_select_voltage(host, ocr); 1252 1253 /* 1254 * Can we support the voltage(s) of the card(s)? 1255 */ 1256 if (!rocr) { 1257 err = -EINVAL; 1258 goto err; 1259 } 1260 1261 /* 1262 * Detect and init the card. 1263 */ 1264 err = mmc_sd_init_card(host, rocr, NULL); 1265 if (err) 1266 goto err; 1267 1268 mmc_release_host(host); 1269 err = mmc_add_card(host->card); 1270 mmc_claim_host(host); 1271 if (err) 1272 goto remove_card; 1273 1274 return 0; 1275 1276 remove_card: 1277 mmc_release_host(host); 1278 mmc_remove_card(host->card); 1279 host->card = NULL; 1280 mmc_claim_host(host); 1281 err: 1282 mmc_detach_bus(host); 1283 1284 pr_err("%s: error %d whilst initialising SD card\n", 1285 mmc_hostname(host), err); 1286 1287 return err; 1288 } 1289 1290