1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/mmc/core/sd.c 4 * 5 * Copyright (C) 2003-2004 Russell King, All Rights Reserved. 6 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. 7 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. 8 */ 9 10 #include <linux/err.h> 11 #include <linux/sizes.h> 12 #include <linux/slab.h> 13 #include <linux/stat.h> 14 #include <linux/string.h> 15 #include <linux/pm_runtime.h> 16 #include <linux/random.h> 17 #include <linux/scatterlist.h> 18 #include <linux/sysfs.h> 19 20 #include <linux/mmc/host.h> 21 #include <linux/mmc/card.h> 22 #include <linux/mmc/mmc.h> 23 #include <linux/mmc/sd.h> 24 25 #include "core.h" 26 #include "card.h" 27 #include "host.h" 28 #include "bus.h" 29 #include "mmc_ops.h" 30 #include "quirks.h" 31 #include "sd.h" 32 #include "sd_ops.h" 33 34 static const unsigned int tran_exp[] = { 35 10000, 100000, 1000000, 10000000, 36 0, 0, 0, 0 37 }; 38 39 static const unsigned char tran_mant[] = { 40 0, 10, 12, 13, 15, 20, 25, 30, 41 35, 40, 45, 50, 55, 60, 70, 80, 42 }; 43 44 static const unsigned int taac_exp[] = { 45 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 46 }; 47 48 static const unsigned int taac_mant[] = { 49 0, 10, 12, 13, 15, 20, 25, 30, 50 35, 40, 45, 50, 55, 60, 70, 80, 51 }; 52 53 static const unsigned int sd_au_size[] = { 54 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512, 55 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512, 56 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512, 57 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512, 58 }; 59 60 #define SD_POWEROFF_NOTIFY_TIMEOUT_MS 1000 61 #define SD_WRITE_EXTR_SINGLE_TIMEOUT_MS 1000 62 63 struct sd_busy_data { 64 struct mmc_card *card; 65 u8 *reg_buf; 66 }; 67 68 /* 69 * Given the decoded CSD structure, decode the raw CID to our CID structure. 70 */ 71 void mmc_decode_cid(struct mmc_card *card) 72 { 73 u32 *resp = card->raw_cid; 74 75 /* 76 * Add the raw card ID (cid) data to the entropy pool. It doesn't 77 * matter that not all of it is unique, it's just bonus entropy. 78 */ 79 add_device_randomness(&card->raw_cid, sizeof(card->raw_cid)); 80 81 /* 82 * SD doesn't currently have a version field so we will 83 * have to assume we can parse this. 84 */ 85 card->cid.manfid = unstuff_bits(resp, 120, 8); 86 card->cid.oemid = unstuff_bits(resp, 104, 16); 87 card->cid.prod_name[0] = unstuff_bits(resp, 96, 8); 88 card->cid.prod_name[1] = unstuff_bits(resp, 88, 8); 89 card->cid.prod_name[2] = unstuff_bits(resp, 80, 8); 90 card->cid.prod_name[3] = unstuff_bits(resp, 72, 8); 91 card->cid.prod_name[4] = unstuff_bits(resp, 64, 8); 92 card->cid.hwrev = unstuff_bits(resp, 60, 4); 93 card->cid.fwrev = unstuff_bits(resp, 56, 4); 94 card->cid.serial = unstuff_bits(resp, 24, 32); 95 card->cid.year = unstuff_bits(resp, 12, 8); 96 card->cid.month = unstuff_bits(resp, 8, 4); 97 98 card->cid.year += 2000; /* SD cards year offset */ 99 100 /* some product names may include trailing whitespace */ 101 strim(card->cid.prod_name); 102 } 103 104 /* 105 * Given a 128-bit response, decode to our card CSD structure. 106 */ 107 static int mmc_decode_csd(struct mmc_card *card, bool is_sduc) 108 { 109 struct mmc_csd *csd = &card->csd; 110 unsigned int e, m, csd_struct; 111 u32 *resp = card->raw_csd; 112 113 csd_struct = unstuff_bits(resp, 126, 2); 114 115 switch (csd_struct) { 116 case 0: 117 m = unstuff_bits(resp, 115, 4); 118 e = unstuff_bits(resp, 112, 3); 119 csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10; 120 csd->taac_clks = unstuff_bits(resp, 104, 8) * 100; 121 122 m = unstuff_bits(resp, 99, 4); 123 e = unstuff_bits(resp, 96, 3); 124 csd->max_dtr = tran_exp[e] * tran_mant[m]; 125 csd->cmdclass = unstuff_bits(resp, 84, 12); 126 127 e = unstuff_bits(resp, 47, 3); 128 m = unstuff_bits(resp, 62, 12); 129 csd->capacity = (1 + m) << (e + 2); 130 131 csd->read_blkbits = unstuff_bits(resp, 80, 4); 132 csd->read_partial = unstuff_bits(resp, 79, 1); 133 csd->write_misalign = unstuff_bits(resp, 78, 1); 134 csd->read_misalign = unstuff_bits(resp, 77, 1); 135 csd->dsr_imp = unstuff_bits(resp, 76, 1); 136 csd->r2w_factor = unstuff_bits(resp, 26, 3); 137 csd->write_blkbits = unstuff_bits(resp, 22, 4); 138 csd->write_partial = unstuff_bits(resp, 21, 1); 139 140 if (unstuff_bits(resp, 46, 1)) { 141 csd->erase_size = 1; 142 } else if (csd->write_blkbits >= 9) { 143 csd->erase_size = unstuff_bits(resp, 39, 7) + 1; 144 csd->erase_size <<= csd->write_blkbits - 9; 145 } 146 147 if (unstuff_bits(resp, 13, 1)) 148 mmc_card_set_readonly(card); 149 break; 150 case 1: 151 case 2: 152 /* 153 * This is a block-addressed SDHC, SDXC or SDUC card. 154 * Most interesting fields are unused and have fixed 155 * values. To avoid getting tripped by buggy cards, 156 * we assume those fixed values ourselves. 157 */ 158 mmc_card_set_blockaddr(card); 159 160 csd->taac_ns = 0; /* Unused */ 161 csd->taac_clks = 0; /* Unused */ 162 163 m = unstuff_bits(resp, 99, 4); 164 e = unstuff_bits(resp, 96, 3); 165 csd->max_dtr = tran_exp[e] * tran_mant[m]; 166 csd->cmdclass = unstuff_bits(resp, 84, 12); 167 168 if (csd_struct == 1) 169 m = unstuff_bits(resp, 48, 22); 170 else 171 m = unstuff_bits(resp, 48, 28); 172 csd->c_size = m; 173 174 if (csd->c_size >= 0x400000 && is_sduc) 175 mmc_card_set_ult_capacity(card); 176 else if (csd->c_size >= 0xFFFF) 177 mmc_card_set_ext_capacity(card); 178 179 csd->capacity = (1 + (typeof(sector_t))m) << 10; 180 181 csd->read_blkbits = 9; 182 csd->read_partial = 0; 183 csd->write_misalign = 0; 184 csd->read_misalign = 0; 185 csd->r2w_factor = 4; /* Unused */ 186 csd->write_blkbits = 9; 187 csd->write_partial = 0; 188 csd->erase_size = 1; 189 190 if (unstuff_bits(resp, 13, 1)) 191 mmc_card_set_readonly(card); 192 break; 193 default: 194 pr_err("%s: unrecognised CSD structure version %d\n", 195 mmc_hostname(card->host), csd_struct); 196 return -EINVAL; 197 } 198 199 card->erase_size = csd->erase_size; 200 201 return 0; 202 } 203 204 /* 205 * Given a 64-bit response, decode to our card SCR structure. 206 */ 207 int mmc_decode_scr(struct mmc_card *card) 208 { 209 struct sd_scr *scr = &card->scr; 210 unsigned int scr_struct; 211 u32 resp[4]; 212 213 resp[3] = card->raw_scr[1]; 214 resp[2] = card->raw_scr[0]; 215 216 scr_struct = unstuff_bits(resp, 60, 4); 217 if (scr_struct != 0) { 218 pr_err("%s: unrecognised SCR structure version %d\n", 219 mmc_hostname(card->host), scr_struct); 220 return -EINVAL; 221 } 222 223 scr->sda_vsn = unstuff_bits(resp, 56, 4); 224 scr->bus_widths = unstuff_bits(resp, 48, 4); 225 if (scr->sda_vsn == SCR_SPEC_VER_2) 226 /* Check if Physical Layer Spec v3.0 is supported */ 227 scr->sda_spec3 = unstuff_bits(resp, 47, 1); 228 229 if (scr->sda_spec3) { 230 scr->sda_spec4 = unstuff_bits(resp, 42, 1); 231 scr->sda_specx = unstuff_bits(resp, 38, 4); 232 } 233 234 if (unstuff_bits(resp, 55, 1)) 235 card->erased_byte = 0xFF; 236 else 237 card->erased_byte = 0x0; 238 239 if (scr->sda_spec4) 240 scr->cmds = unstuff_bits(resp, 32, 4); 241 else if (scr->sda_spec3) 242 scr->cmds = unstuff_bits(resp, 32, 2); 243 244 /* SD Spec says: any SD Card shall set at least bits 0 and 2 */ 245 if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) || 246 !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) { 247 pr_err("%s: invalid bus width\n", mmc_hostname(card->host)); 248 return -EINVAL; 249 } 250 251 return 0; 252 } 253 254 /* 255 * Fetch and process SD Status register. 256 */ 257 static int mmc_read_ssr(struct mmc_card *card) 258 { 259 unsigned int au, es, et, eo; 260 __be32 *raw_ssr; 261 u32 resp[4] = {}; 262 u8 discard_support; 263 int i; 264 265 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 266 pr_warn("%s: card lacks mandatory SD Status function\n", 267 mmc_hostname(card->host)); 268 return 0; 269 } 270 271 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL); 272 if (!raw_ssr) 273 return -ENOMEM; 274 275 if (mmc_app_sd_status(card, raw_ssr)) { 276 pr_warn("%s: problem reading SD Status register\n", 277 mmc_hostname(card->host)); 278 kfree(raw_ssr); 279 return 0; 280 } 281 282 for (i = 0; i < 16; i++) 283 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]); 284 285 kfree(raw_ssr); 286 287 /* 288 * unstuff_bits only works with four u32s so we have to offset the 289 * bitfield positions accordingly. 290 */ 291 au = unstuff_bits(card->raw_ssr, 428 - 384, 4); 292 if (au) { 293 if (au <= 9 || card->scr.sda_spec3) { 294 card->ssr.au = sd_au_size[au]; 295 es = unstuff_bits(card->raw_ssr, 408 - 384, 16); 296 et = unstuff_bits(card->raw_ssr, 402 - 384, 6); 297 if (es && et) { 298 eo = unstuff_bits(card->raw_ssr, 400 - 384, 2); 299 card->ssr.erase_timeout = (et * 1000) / es; 300 card->ssr.erase_offset = eo * 1000; 301 } 302 } else { 303 pr_warn("%s: SD Status: Invalid Allocation Unit size\n", 304 mmc_hostname(card->host)); 305 } 306 } 307 308 /* 309 * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set 310 */ 311 resp[3] = card->raw_ssr[6]; 312 discard_support = unstuff_bits(resp, 313 - 288, 1); 313 card->erase_arg = (card->scr.sda_specx && discard_support) ? 314 SD_DISCARD_ARG : SD_ERASE_ARG; 315 316 return 0; 317 } 318 319 /* 320 * Fetches and decodes switch information 321 */ 322 static int mmc_read_switch(struct mmc_card *card) 323 { 324 int err; 325 u8 *status; 326 327 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 328 return 0; 329 330 if (!(card->csd.cmdclass & CCC_SWITCH)) { 331 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n", 332 mmc_hostname(card->host)); 333 return 0; 334 } 335 336 status = kmalloc(64, GFP_KERNEL); 337 if (!status) 338 return -ENOMEM; 339 340 /* 341 * Find out the card's support bits with a mode 0 operation. 342 * The argument does not matter, as the support bits do not 343 * change with the arguments. 344 */ 345 err = mmc_sd_switch(card, SD_SWITCH_CHECK, 0, 0, status); 346 if (err) { 347 /* 348 * If the host or the card can't do the switch, 349 * fail more gracefully. 350 */ 351 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 352 goto out; 353 354 pr_warn("%s: problem reading Bus Speed modes\n", 355 mmc_hostname(card->host)); 356 err = 0; 357 358 goto out; 359 } 360 361 if (status[13] & SD_MODE_HIGH_SPEED) 362 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; 363 364 if (card->scr.sda_spec3) { 365 card->sw_caps.sd3_bus_mode = status[13]; 366 /* Driver Strengths supported by the card */ 367 card->sw_caps.sd3_drv_type = status[9]; 368 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8; 369 } 370 371 out: 372 kfree(status); 373 374 return err; 375 } 376 377 /* 378 * Test if the card supports high-speed mode and, if so, switch to it. 379 */ 380 int mmc_sd_switch_hs(struct mmc_card *card) 381 { 382 int err; 383 u8 *status; 384 385 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 386 return 0; 387 388 if (!(card->csd.cmdclass & CCC_SWITCH)) 389 return 0; 390 391 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 392 return 0; 393 394 if (card->sw_caps.hs_max_dtr == 0) 395 return 0; 396 397 status = kmalloc(64, GFP_KERNEL); 398 if (!status) 399 return -ENOMEM; 400 401 err = mmc_sd_switch(card, SD_SWITCH_SET, 0, 402 HIGH_SPEED_BUS_SPEED, status); 403 if (err) 404 goto out; 405 406 if ((status[16] & 0xF) != HIGH_SPEED_BUS_SPEED) { 407 pr_warn("%s: Problem switching card into high-speed mode!\n", 408 mmc_hostname(card->host)); 409 err = 0; 410 } else { 411 err = 1; 412 } 413 414 out: 415 kfree(status); 416 417 return err; 418 } 419 420 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 421 { 422 int card_drv_type, drive_strength, drv_type; 423 int err; 424 425 card->drive_strength = 0; 426 427 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; 428 429 drive_strength = mmc_select_drive_strength(card, 430 card->sw_caps.uhs_max_dtr, 431 card_drv_type, &drv_type); 432 433 if (drive_strength) { 434 err = mmc_sd_switch(card, SD_SWITCH_SET, 2, 435 drive_strength, status); 436 if (err) 437 return err; 438 if ((status[15] & 0xF) != drive_strength) { 439 pr_warn("%s: Problem setting drive strength!\n", 440 mmc_hostname(card->host)); 441 return 0; 442 } 443 card->drive_strength = drive_strength; 444 } 445 446 if (drv_type) 447 mmc_set_driver_type(card->host, drv_type); 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_can_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, SD_SWITCH_SET, 0, card->sd_bus_speed, status); 516 if (err) 517 return err; 518 519 if ((status[16] & 0xF) != card->sd_bus_speed) 520 pr_warn("%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 * The above is incorrect: if we try to set a current limit that is 586 * not supported by the card, the card can rightfully error out the 587 * attempt, and remain at the default current limit. This results 588 * in a 300mA card being limited to 200mA even though the host 589 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with 590 * an iMX6 host. --rmk 591 */ 592 if (max_current >= 800 && 593 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) 594 current_limit = SD_SET_CURRENT_LIMIT_800; 595 else if (max_current >= 600 && 596 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) 597 current_limit = SD_SET_CURRENT_LIMIT_600; 598 else if (max_current >= 400 && 599 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) 600 current_limit = SD_SET_CURRENT_LIMIT_400; 601 else if (max_current >= 200 && 602 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) 603 current_limit = SD_SET_CURRENT_LIMIT_200; 604 605 if (current_limit != SD_SET_CURRENT_NO_CHANGE) { 606 err = mmc_sd_switch(card, SD_SWITCH_SET, 3, 607 current_limit, status); 608 if (err) 609 return err; 610 611 if (((status[15] >> 4) & 0x0F) != current_limit) 612 pr_warn("%s: Problem setting current limit!\n", 613 mmc_hostname(card->host)); 614 615 } 616 617 return 0; 618 } 619 620 /* 621 * Determine if the card should tune or not. 622 */ 623 static bool mmc_sd_use_tuning(struct mmc_card *card) 624 { 625 /* 626 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 627 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 628 */ 629 if (mmc_host_is_spi(card->host)) 630 return false; 631 632 switch (card->host->ios.timing) { 633 case MMC_TIMING_UHS_SDR50: 634 case MMC_TIMING_UHS_SDR104: 635 return true; 636 case MMC_TIMING_UHS_DDR50: 637 return !mmc_card_no_uhs_ddr50_tuning(card); 638 } 639 640 return false; 641 } 642 643 /* 644 * UHS-I specific initialization procedure 645 */ 646 static int mmc_sd_init_uhs_card(struct mmc_card *card) 647 { 648 int err; 649 u8 *status; 650 651 if (!(card->csd.cmdclass & CCC_SWITCH)) 652 return 0; 653 654 status = kmalloc(64, GFP_KERNEL); 655 if (!status) 656 return -ENOMEM; 657 658 /* Set 4-bit bus width */ 659 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 660 if (err) 661 goto out; 662 663 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 664 665 /* 666 * Select the bus speed mode depending on host 667 * and card capability. 668 */ 669 sd_update_bus_speed_mode(card); 670 671 /* Set the driver strength for the card */ 672 err = sd_select_driver_type(card, status); 673 if (err) 674 goto out; 675 676 /* Set current limit for the card */ 677 err = sd_set_current_limit(card, status); 678 if (err) 679 goto out; 680 681 /* Set bus speed mode of the card */ 682 err = sd_set_bus_speed_mode(card, status); 683 if (err) 684 goto out; 685 686 if (mmc_sd_use_tuning(card)) { 687 err = mmc_execute_tuning(card); 688 689 /* 690 * As SD Specifications Part1 Physical Layer Specification 691 * Version 3.01 says, CMD19 tuning is available for unlocked 692 * cards in transfer state of 1.8V signaling mode. The small 693 * difference between v3.00 and 3.01 spec means that CMD19 694 * tuning is also available for DDR50 mode. 695 */ 696 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) { 697 pr_warn("%s: ddr50 tuning failed\n", 698 mmc_hostname(card->host)); 699 err = 0; 700 } 701 } 702 703 out: 704 kfree(status); 705 706 return err; 707 } 708 709 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 710 card->raw_cid[2], card->raw_cid[3]); 711 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 712 card->raw_csd[2], card->raw_csd[3]); 713 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 714 MMC_DEV_ATTR(ssr, 715 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n", 716 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2], 717 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5], 718 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8], 719 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11], 720 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14], 721 card->raw_ssr[15]); 722 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 723 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 724 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 725 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 726 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 727 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 728 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 729 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 730 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 731 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr); 732 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca); 733 734 735 static ssize_t mmc_dsr_show(struct device *dev, struct device_attribute *attr, 736 char *buf) 737 { 738 struct mmc_card *card = mmc_dev_to_card(dev); 739 struct mmc_host *host = card->host; 740 741 if (card->csd.dsr_imp && host->dsr_req) 742 return sysfs_emit(buf, "0x%x\n", host->dsr); 743 /* return default DSR value */ 744 return sysfs_emit(buf, "0x%x\n", 0x404); 745 } 746 747 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL); 748 749 MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor); 750 MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device); 751 MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev); 752 753 #define sdio_info_attr(num) \ 754 static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \ 755 { \ 756 struct mmc_card *card = mmc_dev_to_card(dev); \ 757 \ 758 if (num > card->num_info) \ 759 return -ENODATA; \ 760 if (!card->info[num - 1][0]) \ 761 return 0; \ 762 return sysfs_emit(buf, "%s\n", card->info[num - 1]); \ 763 } \ 764 static DEVICE_ATTR_RO(info##num) 765 766 sdio_info_attr(1); 767 sdio_info_attr(2); 768 sdio_info_attr(3); 769 sdio_info_attr(4); 770 771 static struct attribute *sd_std_attrs[] = { 772 &dev_attr_vendor.attr, 773 &dev_attr_device.attr, 774 &dev_attr_revision.attr, 775 &dev_attr_info1.attr, 776 &dev_attr_info2.attr, 777 &dev_attr_info3.attr, 778 &dev_attr_info4.attr, 779 &dev_attr_cid.attr, 780 &dev_attr_csd.attr, 781 &dev_attr_scr.attr, 782 &dev_attr_ssr.attr, 783 &dev_attr_date.attr, 784 &dev_attr_erase_size.attr, 785 &dev_attr_preferred_erase_size.attr, 786 &dev_attr_fwrev.attr, 787 &dev_attr_hwrev.attr, 788 &dev_attr_manfid.attr, 789 &dev_attr_name.attr, 790 &dev_attr_oemid.attr, 791 &dev_attr_serial.attr, 792 &dev_attr_ocr.attr, 793 &dev_attr_rca.attr, 794 &dev_attr_dsr.attr, 795 NULL, 796 }; 797 798 static umode_t sd_std_is_visible(struct kobject *kobj, struct attribute *attr, 799 int index) 800 { 801 struct device *dev = kobj_to_dev(kobj); 802 struct mmc_card *card = mmc_dev_to_card(dev); 803 804 /* CIS vendor and device ids, revision and info string are available only for Combo cards */ 805 if ((attr == &dev_attr_vendor.attr || 806 attr == &dev_attr_device.attr || 807 attr == &dev_attr_revision.attr || 808 attr == &dev_attr_info1.attr || 809 attr == &dev_attr_info2.attr || 810 attr == &dev_attr_info3.attr || 811 attr == &dev_attr_info4.attr 812 ) &&!mmc_card_sd_combo(card)) 813 return 0; 814 815 return attr->mode; 816 } 817 818 static const struct attribute_group sd_std_group = { 819 .attrs = sd_std_attrs, 820 .is_visible = sd_std_is_visible, 821 }; 822 __ATTRIBUTE_GROUPS(sd_std); 823 824 const struct device_type sd_type = { 825 .groups = sd_std_groups, 826 }; 827 828 /* 829 * Fetch CID from card. 830 */ 831 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 832 { 833 int err; 834 u32 max_current; 835 int retries = 10; 836 u32 pocr = ocr; 837 838 try_again: 839 if (!retries) { 840 ocr &= ~SD_OCR_S18R; 841 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 842 } 843 844 /* 845 * Since we're changing the OCR value, we seem to 846 * need to tell some cards to go back to the idle 847 * state. We wait 1ms to give cards time to 848 * respond. 849 */ 850 mmc_go_idle(host); 851 852 /* 853 * If SD_SEND_IF_COND indicates an SD 2.0 854 * compliant card and we should set bit 30 855 * of the ocr to indicate that we can handle 856 * block-addressed SDHC cards. 857 */ 858 err = mmc_send_if_cond(host, ocr); 859 if (!err) { 860 ocr |= SD_OCR_CCS; 861 /* Set HO2T as well - SDUC card won't respond otherwise */ 862 ocr |= SD_OCR_2T; 863 } 864 865 /* 866 * If the host supports one of UHS-I modes, request the card 867 * to switch to 1.8V signaling level. If the card has failed 868 * repeatedly to switch however, skip this. 869 */ 870 if (retries && mmc_host_can_uhs(host)) 871 ocr |= SD_OCR_S18R; 872 873 /* 874 * If the host can supply more than 150mA at current voltage, 875 * XPC should be set to 1. 876 */ 877 max_current = sd_get_host_max_current(host); 878 if (max_current > 150) 879 ocr |= SD_OCR_XPC; 880 881 err = mmc_send_app_op_cond(host, ocr, rocr); 882 if (err) 883 return err; 884 885 /* 886 * In case the S18A bit is set in the response, let's start the signal 887 * voltage switch procedure. SPI mode doesn't support CMD11. 888 * Note that, according to the spec, the S18A bit is not valid unless 889 * the CCS bit is set as well. We deliberately deviate from the spec in 890 * regards to this, which allows UHS-I to be supported for SDSC cards. 891 */ 892 if (!mmc_host_is_spi(host) && (ocr & SD_OCR_S18R) && 893 rocr && (*rocr & SD_ROCR_S18A)) { 894 err = mmc_set_uhs_voltage(host, pocr); 895 if (err == -EAGAIN) { 896 retries--; 897 goto try_again; 898 } else if (err) { 899 retries = 0; 900 goto try_again; 901 } 902 } 903 904 err = mmc_send_cid(host, cid); 905 return err; 906 } 907 908 int mmc_sd_get_csd(struct mmc_card *card, bool is_sduc) 909 { 910 int err; 911 912 /* 913 * Fetch CSD from card. 914 */ 915 err = mmc_send_csd(card, card->raw_csd); 916 if (err) 917 return err; 918 919 err = mmc_decode_csd(card, is_sduc); 920 if (err) 921 return err; 922 923 return 0; 924 } 925 926 int mmc_sd_get_ro(struct mmc_host *host) 927 { 928 int ro; 929 930 /* 931 * Some systems don't feature a write-protect pin and don't need one. 932 * E.g. because they only have micro-SD card slot. For those systems 933 * assume that the SD card is always read-write. 934 */ 935 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT) 936 return 0; 937 938 if (!host->ops->get_ro) 939 return -1; 940 941 ro = host->ops->get_ro(host); 942 943 return ro; 944 } 945 946 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 947 bool reinit) 948 { 949 int err; 950 951 if (!reinit) { 952 /* 953 * Fetch SCR from card. 954 */ 955 err = mmc_app_send_scr(card); 956 if (err) 957 return err; 958 959 err = mmc_decode_scr(card); 960 if (err) 961 return err; 962 963 /* 964 * Fetch and process SD Status register. 965 */ 966 err = mmc_read_ssr(card); 967 if (err) 968 return err; 969 970 /* Erase init depends on CSD and SSR */ 971 mmc_init_erase(card); 972 } 973 974 /* 975 * Fetch switch information from card. Note, sd3_bus_mode can change if 976 * voltage switch outcome changes, so do this always. 977 */ 978 err = mmc_read_switch(card); 979 if (err) 980 return err; 981 982 /* 983 * For SPI, enable CRC as appropriate. 984 * This CRC enable is located AFTER the reading of the 985 * card registers because some SDHC cards are not able 986 * to provide valid CRCs for non-512-byte blocks. 987 */ 988 if (mmc_host_is_spi(host)) { 989 err = mmc_spi_set_crc(host, use_spi_crc); 990 if (err) 991 return err; 992 } 993 994 /* 995 * Check if read-only switch is active. 996 */ 997 if (!reinit) { 998 int ro = mmc_sd_get_ro(host); 999 1000 if (ro < 0) { 1001 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n", 1002 mmc_hostname(host)); 1003 } else if (ro > 0) { 1004 mmc_card_set_readonly(card); 1005 } 1006 } 1007 1008 return 0; 1009 } 1010 1011 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 1012 { 1013 unsigned max_dtr = (unsigned int)-1; 1014 1015 if (mmc_card_hs(card)) { 1016 if (max_dtr > card->sw_caps.hs_max_dtr) 1017 max_dtr = card->sw_caps.hs_max_dtr; 1018 } else if (max_dtr > card->csd.max_dtr) { 1019 max_dtr = card->csd.max_dtr; 1020 } 1021 1022 return max_dtr; 1023 } 1024 1025 static bool mmc_sd_card_using_v18(struct mmc_card *card) 1026 { 1027 /* 1028 * According to the SD spec., the Bus Speed Mode (function group 1) bits 1029 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus 1030 * they can be used to determine if the card has already switched to 1031 * 1.8V signaling. 1032 */ 1033 return card->sw_caps.sd3_bus_mode & 1034 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); 1035 } 1036 1037 static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 page, u16 offset, 1038 u8 reg_data) 1039 { 1040 struct mmc_host *host = card->host; 1041 struct mmc_request mrq = {}; 1042 struct mmc_command cmd = {}; 1043 struct mmc_data data = {}; 1044 struct scatterlist sg; 1045 u8 *reg_buf; 1046 1047 reg_buf = kzalloc(512, GFP_KERNEL); 1048 if (!reg_buf) 1049 return -ENOMEM; 1050 1051 mrq.cmd = &cmd; 1052 mrq.data = &data; 1053 1054 /* 1055 * Arguments of CMD49: 1056 * [31:31] MIO (0 = memory). 1057 * [30:27] FNO (function number). 1058 * [26:26] MW - mask write mode (0 = disable). 1059 * [25:18] page number. 1060 * [17:9] offset address. 1061 * [8:0] length (0 = 1 byte). 1062 */ 1063 cmd.arg = fno << 27 | page << 18 | offset << 9; 1064 1065 /* The first byte in the buffer is the data to be written. */ 1066 reg_buf[0] = reg_data; 1067 1068 data.flags = MMC_DATA_WRITE; 1069 data.blksz = 512; 1070 data.blocks = 1; 1071 data.sg = &sg; 1072 data.sg_len = 1; 1073 sg_init_one(&sg, reg_buf, 512); 1074 1075 cmd.opcode = SD_WRITE_EXTR_SINGLE; 1076 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; 1077 1078 mmc_set_data_timeout(&data, card); 1079 mmc_wait_for_req(host, &mrq); 1080 1081 kfree(reg_buf); 1082 1083 /* 1084 * Note that, the SD card is allowed to signal busy on DAT0 up to 1s 1085 * after the CMD49. Although, let's leave this to be managed by the 1086 * caller. 1087 */ 1088 1089 if (cmd.error) 1090 return cmd.error; 1091 if (data.error) 1092 return data.error; 1093 1094 return 0; 1095 } 1096 1097 static int sd_read_ext_reg(struct mmc_card *card, u8 fno, u8 page, 1098 u16 offset, u16 len, u8 *reg_buf) 1099 { 1100 u32 cmd_args; 1101 1102 /* 1103 * Command arguments of CMD48: 1104 * [31:31] MIO (0 = memory). 1105 * [30:27] FNO (function number). 1106 * [26:26] reserved (0). 1107 * [25:18] page number. 1108 * [17:9] offset address. 1109 * [8:0] length (0 = 1 byte, 1ff = 512 bytes). 1110 */ 1111 cmd_args = fno << 27 | page << 18 | offset << 9 | (len -1); 1112 1113 return mmc_send_adtc_data(card, card->host, SD_READ_EXTR_SINGLE, 1114 cmd_args, reg_buf, 512); 1115 } 1116 1117 static int sd_parse_ext_reg_power(struct mmc_card *card, u8 fno, u8 page, 1118 u16 offset) 1119 { 1120 int err; 1121 u8 *reg_buf; 1122 1123 reg_buf = kzalloc(512, GFP_KERNEL); 1124 if (!reg_buf) 1125 return -ENOMEM; 1126 1127 /* Read the extension register for power management function. */ 1128 err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf); 1129 if (err) { 1130 pr_warn("%s: error %d reading PM func of ext reg\n", 1131 mmc_hostname(card->host), err); 1132 goto out; 1133 } 1134 1135 /* PM revision consists of 4 bits. */ 1136 card->ext_power.rev = reg_buf[0] & 0xf; 1137 1138 /* Power Off Notification support at bit 4. */ 1139 if ((reg_buf[1] & BIT(4)) && !mmc_card_broken_sd_poweroff_notify(card)) 1140 card->ext_power.feature_support |= SD_EXT_POWER_OFF_NOTIFY; 1141 1142 /* Power Sustenance support at bit 5. */ 1143 if (reg_buf[1] & BIT(5)) 1144 card->ext_power.feature_support |= SD_EXT_POWER_SUSTENANCE; 1145 1146 /* Power Down Mode support at bit 6. */ 1147 if (reg_buf[1] & BIT(6)) 1148 card->ext_power.feature_support |= SD_EXT_POWER_DOWN_MODE; 1149 1150 card->ext_power.fno = fno; 1151 card->ext_power.page = page; 1152 card->ext_power.offset = offset; 1153 1154 out: 1155 kfree(reg_buf); 1156 return err; 1157 } 1158 1159 static int sd_parse_ext_reg_perf(struct mmc_card *card, u8 fno, u8 page, 1160 u16 offset) 1161 { 1162 int err; 1163 u8 *reg_buf; 1164 1165 reg_buf = kzalloc(512, GFP_KERNEL); 1166 if (!reg_buf) 1167 return -ENOMEM; 1168 1169 err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf); 1170 if (err) { 1171 pr_warn("%s: error %d reading PERF func of ext reg\n", 1172 mmc_hostname(card->host), err); 1173 goto out; 1174 } 1175 1176 /* PERF revision. */ 1177 card->ext_perf.rev = reg_buf[0]; 1178 1179 /* FX_EVENT support at bit 0. */ 1180 if (reg_buf[1] & BIT(0)) 1181 card->ext_perf.feature_support |= SD_EXT_PERF_FX_EVENT; 1182 1183 /* Card initiated self-maintenance support at bit 0. */ 1184 if (reg_buf[2] & BIT(0)) 1185 card->ext_perf.feature_support |= SD_EXT_PERF_CARD_MAINT; 1186 1187 /* Host initiated self-maintenance support at bit 1. */ 1188 if (reg_buf[2] & BIT(1)) 1189 card->ext_perf.feature_support |= SD_EXT_PERF_HOST_MAINT; 1190 1191 /* Cache support at bit 0. */ 1192 if ((reg_buf[4] & BIT(0)) && !mmc_card_broken_sd_cache(card)) 1193 card->ext_perf.feature_support |= SD_EXT_PERF_CACHE; 1194 1195 /* Command queue support indicated via queue depth bits (0 to 4). */ 1196 if (reg_buf[6] & 0x1f) 1197 card->ext_perf.feature_support |= SD_EXT_PERF_CMD_QUEUE; 1198 1199 card->ext_perf.fno = fno; 1200 card->ext_perf.page = page; 1201 card->ext_perf.offset = offset; 1202 1203 out: 1204 kfree(reg_buf); 1205 return err; 1206 } 1207 1208 static int sd_parse_ext_reg(struct mmc_card *card, u8 *gen_info_buf, 1209 u16 *next_ext_addr) 1210 { 1211 u8 num_regs, fno, page; 1212 u16 sfc, offset, ext = *next_ext_addr; 1213 u32 reg_addr; 1214 1215 /* 1216 * Parse only one register set per extension, as that is sufficient to 1217 * support the standard functions. This means another 48 bytes in the 1218 * buffer must be available. 1219 */ 1220 if (ext + 48 > 512) 1221 return -EFAULT; 1222 1223 /* Standard Function Code */ 1224 memcpy(&sfc, &gen_info_buf[ext], 2); 1225 1226 /* Address to the next extension. */ 1227 memcpy(next_ext_addr, &gen_info_buf[ext + 40], 2); 1228 1229 /* Number of registers for this extension. */ 1230 num_regs = gen_info_buf[ext + 42]; 1231 1232 /* We support only one register per extension. */ 1233 if (num_regs != 1) 1234 return 0; 1235 1236 /* Extension register address. */ 1237 memcpy(®_addr, &gen_info_buf[ext + 44], 4); 1238 1239 /* 9 bits (0 to 8) contains the offset address. */ 1240 offset = reg_addr & 0x1ff; 1241 1242 /* 8 bits (9 to 16) contains the page number. */ 1243 page = reg_addr >> 9 & 0xff ; 1244 1245 /* 4 bits (18 to 21) contains the function number. */ 1246 fno = reg_addr >> 18 & 0xf; 1247 1248 /* Standard Function Code for power management. */ 1249 if (sfc == 0x1) 1250 return sd_parse_ext_reg_power(card, fno, page, offset); 1251 1252 /* Standard Function Code for performance enhancement. */ 1253 if (sfc == 0x2) 1254 return sd_parse_ext_reg_perf(card, fno, page, offset); 1255 1256 return 0; 1257 } 1258 1259 static int sd_read_ext_regs(struct mmc_card *card) 1260 { 1261 int err, i; 1262 u8 num_ext, *gen_info_buf; 1263 u16 rev, len, next_ext_addr; 1264 1265 if (mmc_host_is_spi(card->host)) 1266 return 0; 1267 1268 if (!(card->scr.cmds & SD_SCR_CMD48_SUPPORT)) 1269 return 0; 1270 1271 gen_info_buf = kzalloc(512, GFP_KERNEL); 1272 if (!gen_info_buf) 1273 return -ENOMEM; 1274 1275 /* 1276 * Read 512 bytes of general info, which is found at function number 0, 1277 * at page 0 and with no offset. 1278 */ 1279 err = sd_read_ext_reg(card, 0, 0, 0, 512, gen_info_buf); 1280 if (err) { 1281 pr_err("%s: error %d reading general info of SD ext reg\n", 1282 mmc_hostname(card->host), err); 1283 goto out; 1284 } 1285 1286 /* General info structure revision. */ 1287 memcpy(&rev, &gen_info_buf[0], 2); 1288 1289 /* Length of general info in bytes. */ 1290 memcpy(&len, &gen_info_buf[2], 2); 1291 1292 /* Number of extensions to be find. */ 1293 num_ext = gen_info_buf[4]; 1294 1295 /* 1296 * We only support revision 0 and limit it to 512 bytes for simplicity. 1297 * No matter what, let's return zero to allow us to continue using the 1298 * card, even if we can't support the features from the SD function 1299 * extensions registers. 1300 */ 1301 if (rev != 0 || len > 512) { 1302 pr_warn("%s: non-supported SD ext reg layout\n", 1303 mmc_hostname(card->host)); 1304 goto out; 1305 } 1306 1307 /* 1308 * Parse the extension registers. The first extension should start 1309 * immediately after the general info header (16 bytes). 1310 */ 1311 next_ext_addr = 16; 1312 for (i = 0; i < num_ext; i++) { 1313 err = sd_parse_ext_reg(card, gen_info_buf, &next_ext_addr); 1314 if (err) { 1315 pr_err("%s: error %d parsing SD ext reg\n", 1316 mmc_hostname(card->host), err); 1317 goto out; 1318 } 1319 } 1320 1321 out: 1322 kfree(gen_info_buf); 1323 return err; 1324 } 1325 1326 static bool sd_cache_enabled(struct mmc_host *host) 1327 { 1328 return host->card->ext_perf.feature_enabled & SD_EXT_PERF_CACHE; 1329 } 1330 1331 static int sd_flush_cache(struct mmc_host *host) 1332 { 1333 struct mmc_card *card = host->card; 1334 u8 *reg_buf, fno, page; 1335 u16 offset; 1336 int err; 1337 1338 if (!sd_cache_enabled(host)) 1339 return 0; 1340 1341 reg_buf = kzalloc(512, GFP_KERNEL); 1342 if (!reg_buf) 1343 return -ENOMEM; 1344 1345 /* 1346 * Set Flush Cache at bit 0 in the performance enhancement register at 1347 * 261 bytes offset. 1348 */ 1349 fno = card->ext_perf.fno; 1350 page = card->ext_perf.page; 1351 offset = card->ext_perf.offset + 261; 1352 1353 err = sd_write_ext_reg(card, fno, page, offset, BIT(0)); 1354 if (err) { 1355 pr_warn("%s: error %d writing Cache Flush bit\n", 1356 mmc_hostname(host), err); 1357 goto out; 1358 } 1359 1360 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false, 1361 MMC_BUSY_EXTR_SINGLE); 1362 if (err) 1363 goto out; 1364 1365 /* 1366 * Read the Flush Cache bit. The card shall reset it, to confirm that 1367 * it's has completed the flushing of the cache. 1368 */ 1369 err = sd_read_ext_reg(card, fno, page, offset, 1, reg_buf); 1370 if (err) { 1371 pr_warn("%s: error %d reading Cache Flush bit\n", 1372 mmc_hostname(host), err); 1373 goto out; 1374 } 1375 1376 if (reg_buf[0] & BIT(0)) 1377 err = -ETIMEDOUT; 1378 out: 1379 kfree(reg_buf); 1380 return err; 1381 } 1382 1383 static int sd_enable_cache(struct mmc_card *card) 1384 { 1385 u8 *reg_buf; 1386 int err; 1387 1388 card->ext_perf.feature_enabled &= ~SD_EXT_PERF_CACHE; 1389 1390 reg_buf = kzalloc(512, GFP_KERNEL); 1391 if (!reg_buf) 1392 return -ENOMEM; 1393 1394 /* 1395 * Set Cache Enable at bit 0 in the performance enhancement register at 1396 * 260 bytes offset. 1397 */ 1398 err = sd_write_ext_reg(card, card->ext_perf.fno, card->ext_perf.page, 1399 card->ext_perf.offset + 260, BIT(0)); 1400 if (err) { 1401 pr_warn("%s: error %d writing Cache Enable bit\n", 1402 mmc_hostname(card->host), err); 1403 goto out; 1404 } 1405 1406 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false, 1407 MMC_BUSY_EXTR_SINGLE); 1408 if (!err) 1409 card->ext_perf.feature_enabled |= SD_EXT_PERF_CACHE; 1410 1411 out: 1412 kfree(reg_buf); 1413 return err; 1414 } 1415 1416 /* 1417 * Handle the detection and initialisation of a card. 1418 * 1419 * In the case of a resume, "oldcard" will contain the card 1420 * we're trying to reinitialise. 1421 */ 1422 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 1423 struct mmc_card *oldcard) 1424 { 1425 struct mmc_card *card; 1426 int err; 1427 u32 cid[4]; 1428 u32 rocr = 0; 1429 bool v18_fixup_failed = false; 1430 1431 WARN_ON(!host->claimed); 1432 retry: 1433 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 1434 if (err) 1435 return err; 1436 1437 if (oldcard) { 1438 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { 1439 pr_debug("%s: Perhaps the card was replaced\n", 1440 mmc_hostname(host)); 1441 return -ENOENT; 1442 } 1443 1444 card = oldcard; 1445 } else { 1446 /* 1447 * Allocate card structure. 1448 */ 1449 card = mmc_alloc_card(host, &sd_type); 1450 if (IS_ERR(card)) 1451 return PTR_ERR(card); 1452 1453 card->ocr = ocr; 1454 card->type = MMC_TYPE_SD; 1455 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 1456 } 1457 1458 /* 1459 * Call the optional HC's init_card function to handle quirks. 1460 */ 1461 if (host->ops->init_card) 1462 host->ops->init_card(host, card); 1463 1464 /* 1465 * For native busses: get card RCA and quit open drain mode. 1466 */ 1467 if (!mmc_host_is_spi(host)) { 1468 err = mmc_send_relative_addr(host, &card->rca); 1469 if (err) 1470 goto free_card; 1471 } 1472 1473 if (!oldcard) { 1474 u32 sduc_arg = SD_OCR_CCS | SD_OCR_2T; 1475 bool is_sduc = (rocr & sduc_arg) == sduc_arg; 1476 1477 err = mmc_sd_get_csd(card, is_sduc); 1478 if (err) 1479 goto free_card; 1480 1481 mmc_decode_cid(card); 1482 } 1483 1484 /* 1485 * handling only for cards supporting DSR and hosts requesting 1486 * DSR configuration 1487 */ 1488 if (card->csd.dsr_imp && host->dsr_req) 1489 mmc_set_dsr(host); 1490 1491 /* 1492 * Select card, as all following commands rely on that. 1493 */ 1494 if (!mmc_host_is_spi(host)) { 1495 err = mmc_select_card(card); 1496 if (err) 1497 goto free_card; 1498 } 1499 1500 /* Apply quirks prior to card setup */ 1501 mmc_fixup_device(card, mmc_sd_fixups); 1502 1503 err = mmc_sd_setup_card(host, card, oldcard != NULL); 1504 if (err) 1505 goto free_card; 1506 1507 /* 1508 * If the card has not been power cycled, it may still be using 1.8V 1509 * signaling. Detect that situation and try to initialize a UHS-I (1.8V) 1510 * transfer mode. 1511 */ 1512 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_can_uhs(host) && 1513 mmc_sd_card_using_v18(card) && 1514 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { 1515 if (mmc_host_set_uhs_voltage(host) || 1516 mmc_sd_init_uhs_card(card)) { 1517 v18_fixup_failed = true; 1518 mmc_power_cycle(host, ocr); 1519 if (!oldcard) 1520 mmc_remove_card(card); 1521 goto retry; 1522 } 1523 goto cont; 1524 } 1525 1526 /* Initialization sequence for UHS-I cards */ 1527 if (rocr & SD_ROCR_S18A && mmc_host_can_uhs(host)) { 1528 err = mmc_sd_init_uhs_card(card); 1529 if (err) 1530 goto free_card; 1531 } else { 1532 /* 1533 * Attempt to change to high-speed (if supported) 1534 */ 1535 err = mmc_sd_switch_hs(card); 1536 if (err > 0) 1537 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 1538 else if (err) 1539 goto free_card; 1540 1541 /* 1542 * Set bus speed. 1543 */ 1544 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 1545 1546 if (host->ios.timing == MMC_TIMING_SD_HS && 1547 host->ops->prepare_sd_hs_tuning) { 1548 err = host->ops->prepare_sd_hs_tuning(host, card); 1549 if (err) 1550 goto free_card; 1551 } 1552 1553 /* 1554 * Switch to wider bus (if supported). 1555 */ 1556 if ((host->caps & MMC_CAP_4_BIT_DATA) && 1557 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 1558 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 1559 if (err) 1560 goto free_card; 1561 1562 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1563 } 1564 1565 if (host->ios.timing == MMC_TIMING_SD_HS && 1566 host->ops->execute_sd_hs_tuning) { 1567 err = host->ops->execute_sd_hs_tuning(host, card); 1568 if (err) 1569 goto free_card; 1570 } 1571 } 1572 cont: 1573 if (!oldcard) { 1574 /* Read/parse the extension registers. */ 1575 err = sd_read_ext_regs(card); 1576 if (err) 1577 goto free_card; 1578 } 1579 1580 /* Enable internal SD cache if supported. */ 1581 if (card->ext_perf.feature_support & SD_EXT_PERF_CACHE) { 1582 err = sd_enable_cache(card); 1583 if (err) 1584 goto free_card; 1585 } 1586 1587 if (!mmc_card_ult_capacity(card) && host->cqe_ops && !host->cqe_enabled) { 1588 err = host->cqe_ops->cqe_enable(host, card); 1589 if (!err) { 1590 host->cqe_enabled = true; 1591 host->hsq_enabled = true; 1592 pr_info("%s: Host Software Queue enabled\n", 1593 mmc_hostname(host)); 1594 } 1595 } 1596 1597 if (host->caps2 & MMC_CAP2_AVOID_3_3V && 1598 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) { 1599 pr_err("%s: Host failed to negotiate down from 3.3V\n", 1600 mmc_hostname(host)); 1601 err = -EINVAL; 1602 goto free_card; 1603 } 1604 1605 host->card = card; 1606 return 0; 1607 1608 free_card: 1609 if (!oldcard) 1610 mmc_remove_card(card); 1611 1612 return err; 1613 } 1614 1615 /* 1616 * Card detection - card is alive. 1617 */ 1618 static int mmc_sd_alive(struct mmc_host *host) 1619 { 1620 return mmc_send_status(host->card, NULL); 1621 } 1622 1623 /* 1624 * Card detection callback from host. 1625 */ 1626 static void mmc_sd_detect(struct mmc_host *host) 1627 { 1628 int err; 1629 1630 mmc_get_card(host->card, NULL); 1631 1632 /* 1633 * Just check if our card has been removed. 1634 */ 1635 err = _mmc_detect_card_removed(host); 1636 1637 mmc_put_card(host->card, NULL); 1638 1639 if (err) { 1640 mmc_remove_card(host->card); 1641 host->card = NULL; 1642 1643 mmc_claim_host(host); 1644 mmc_detach_bus(host); 1645 mmc_power_off(host); 1646 mmc_release_host(host); 1647 } 1648 } 1649 1650 static int sd_can_poweroff_notify(struct mmc_card *card) 1651 { 1652 return card->ext_power.feature_support & SD_EXT_POWER_OFF_NOTIFY; 1653 } 1654 1655 static int sd_busy_poweroff_notify_cb(void *cb_data, bool *busy) 1656 { 1657 struct sd_busy_data *data = cb_data; 1658 struct mmc_card *card = data->card; 1659 int err; 1660 1661 /* 1662 * Read the status register for the power management function. It's at 1663 * one byte offset and is one byte long. The Power Off Notification 1664 * Ready is bit 0. 1665 */ 1666 err = sd_read_ext_reg(card, card->ext_power.fno, card->ext_power.page, 1667 card->ext_power.offset + 1, 1, data->reg_buf); 1668 if (err) { 1669 pr_warn("%s: error %d reading status reg of PM func\n", 1670 mmc_hostname(card->host), err); 1671 return err; 1672 } 1673 1674 *busy = !(data->reg_buf[0] & BIT(0)); 1675 return 0; 1676 } 1677 1678 static int sd_poweroff_notify(struct mmc_card *card) 1679 { 1680 struct sd_busy_data cb_data; 1681 u8 *reg_buf; 1682 int err; 1683 1684 reg_buf = kzalloc(512, GFP_KERNEL); 1685 if (!reg_buf) 1686 return -ENOMEM; 1687 1688 /* 1689 * Set the Power Off Notification bit in the power management settings 1690 * register at 2 bytes offset. 1691 */ 1692 err = sd_write_ext_reg(card, card->ext_power.fno, card->ext_power.page, 1693 card->ext_power.offset + 2, BIT(0)); 1694 if (err) { 1695 pr_warn("%s: error %d writing Power Off Notify bit\n", 1696 mmc_hostname(card->host), err); 1697 goto out; 1698 } 1699 1700 /* Find out when the command is completed. */ 1701 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false, 1702 MMC_BUSY_EXTR_SINGLE); 1703 if (err) 1704 goto out; 1705 1706 cb_data.card = card; 1707 cb_data.reg_buf = reg_buf; 1708 err = __mmc_poll_for_busy(card->host, 0, SD_POWEROFF_NOTIFY_TIMEOUT_MS, 1709 &sd_busy_poweroff_notify_cb, &cb_data); 1710 1711 out: 1712 kfree(reg_buf); 1713 return err; 1714 } 1715 1716 static int _mmc_sd_suspend(struct mmc_host *host) 1717 { 1718 struct mmc_card *card = host->card; 1719 int err = 0; 1720 1721 mmc_claim_host(host); 1722 1723 if (mmc_card_suspended(card)) 1724 goto out; 1725 1726 if (sd_can_poweroff_notify(card)) 1727 err = sd_poweroff_notify(card); 1728 else if (!mmc_host_is_spi(host)) 1729 err = mmc_deselect_cards(host); 1730 1731 if (!err) { 1732 mmc_power_off(host); 1733 mmc_card_set_suspended(card); 1734 } 1735 1736 out: 1737 mmc_release_host(host); 1738 return err; 1739 } 1740 1741 /* 1742 * Host is being removed. Free up the current card and do a graceful power-off. 1743 */ 1744 static void mmc_sd_remove(struct mmc_host *host) 1745 { 1746 get_device(&host->card->dev); 1747 mmc_remove_card(host->card); 1748 1749 _mmc_sd_suspend(host); 1750 1751 put_device(&host->card->dev); 1752 host->card = NULL; 1753 } 1754 /* 1755 * Callback for suspend 1756 */ 1757 static int mmc_sd_suspend(struct mmc_host *host) 1758 { 1759 int err; 1760 1761 err = _mmc_sd_suspend(host); 1762 if (!err) { 1763 pm_runtime_disable(&host->card->dev); 1764 pm_runtime_set_suspended(&host->card->dev); 1765 } 1766 1767 return err; 1768 } 1769 1770 /* 1771 * This function tries to determine if the same card is still present 1772 * and, if so, restore all state to it. 1773 */ 1774 static int _mmc_sd_resume(struct mmc_host *host) 1775 { 1776 int err = 0; 1777 1778 mmc_claim_host(host); 1779 1780 if (!mmc_card_suspended(host->card)) 1781 goto out; 1782 1783 mmc_power_up(host, host->card->ocr); 1784 err = mmc_sd_init_card(host, host->card->ocr, host->card); 1785 mmc_card_clr_suspended(host->card); 1786 1787 out: 1788 mmc_release_host(host); 1789 return err; 1790 } 1791 1792 /* 1793 * Callback for resume 1794 */ 1795 static int mmc_sd_resume(struct mmc_host *host) 1796 { 1797 pm_runtime_enable(&host->card->dev); 1798 return 0; 1799 } 1800 1801 /* 1802 * Callback for runtime_suspend. 1803 */ 1804 static int mmc_sd_runtime_suspend(struct mmc_host *host) 1805 { 1806 int err; 1807 1808 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) 1809 return 0; 1810 1811 err = _mmc_sd_suspend(host); 1812 if (err) 1813 pr_err("%s: error %d doing aggressive suspend\n", 1814 mmc_hostname(host), err); 1815 1816 return err; 1817 } 1818 1819 /* 1820 * Callback for runtime_resume. 1821 */ 1822 static int mmc_sd_runtime_resume(struct mmc_host *host) 1823 { 1824 int err; 1825 1826 err = _mmc_sd_resume(host); 1827 if (err && err != -ENOMEDIUM) 1828 pr_err("%s: error %d doing runtime resume\n", 1829 mmc_hostname(host), err); 1830 1831 return 0; 1832 } 1833 1834 static int mmc_sd_hw_reset(struct mmc_host *host) 1835 { 1836 mmc_power_cycle(host, host->card->ocr); 1837 return mmc_sd_init_card(host, host->card->ocr, host->card); 1838 } 1839 1840 static const struct mmc_bus_ops mmc_sd_ops = { 1841 .remove = mmc_sd_remove, 1842 .detect = mmc_sd_detect, 1843 .runtime_suspend = mmc_sd_runtime_suspend, 1844 .runtime_resume = mmc_sd_runtime_resume, 1845 .suspend = mmc_sd_suspend, 1846 .resume = mmc_sd_resume, 1847 .alive = mmc_sd_alive, 1848 .shutdown = mmc_sd_suspend, 1849 .hw_reset = mmc_sd_hw_reset, 1850 .cache_enabled = sd_cache_enabled, 1851 .flush_cache = sd_flush_cache, 1852 }; 1853 1854 /* 1855 * Starting point for SD card init. 1856 */ 1857 int mmc_attach_sd(struct mmc_host *host) 1858 { 1859 int err; 1860 u32 ocr, rocr; 1861 1862 WARN_ON(!host->claimed); 1863 1864 err = mmc_send_app_op_cond(host, 0, &ocr); 1865 if (err) 1866 return err; 1867 1868 mmc_attach_bus(host, &mmc_sd_ops); 1869 if (host->ocr_avail_sd) 1870 host->ocr_avail = host->ocr_avail_sd; 1871 1872 /* 1873 * We need to get OCR a different way for SPI. 1874 */ 1875 if (mmc_host_is_spi(host)) { 1876 mmc_go_idle(host); 1877 1878 err = mmc_spi_read_ocr(host, 0, &ocr); 1879 if (err) 1880 goto err; 1881 } 1882 1883 /* 1884 * Some SD cards claims an out of spec VDD voltage range. Let's treat 1885 * these bits as being in-valid and especially also bit7. 1886 */ 1887 ocr &= ~0x7FFF; 1888 1889 rocr = mmc_select_voltage(host, ocr); 1890 1891 /* 1892 * Can we support the voltage(s) of the card(s)? 1893 */ 1894 if (!rocr) { 1895 err = -EINVAL; 1896 goto err; 1897 } 1898 1899 /* 1900 * Detect and init the card. 1901 */ 1902 err = mmc_sd_init_card(host, rocr, NULL); 1903 if (err) 1904 goto err; 1905 1906 mmc_release_host(host); 1907 err = mmc_add_card(host->card); 1908 if (err) 1909 goto remove_card; 1910 1911 mmc_claim_host(host); 1912 return 0; 1913 1914 remove_card: 1915 mmc_remove_card(host->card); 1916 host->card = NULL; 1917 mmc_claim_host(host); 1918 err: 1919 mmc_detach_bus(host); 1920 1921 pr_err("%s: error %d whilst initialising SD card\n", 1922 mmc_hostname(host), err); 1923 1924 return err; 1925 } 1926