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 = card->host->max_sd_hs_hz ?: 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_LIMIT_200; 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; 601 602 if (current_limit != SD_SET_CURRENT_LIMIT_200) { 603 err = mmc_sd_switch(card, SD_SWITCH_SET, 3, 604 current_limit, status); 605 if (err) 606 return err; 607 608 if (((status[15] >> 4) & 0x0F) != current_limit) 609 pr_warn("%s: Problem setting current limit!\n", 610 mmc_hostname(card->host)); 611 612 } 613 614 return 0; 615 } 616 617 /* 618 * Determine if the card should tune or not. 619 */ 620 static bool mmc_sd_use_tuning(struct mmc_card *card) 621 { 622 /* 623 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 624 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 625 */ 626 if (mmc_host_is_spi(card->host)) 627 return false; 628 629 switch (card->host->ios.timing) { 630 case MMC_TIMING_UHS_SDR50: 631 case MMC_TIMING_UHS_SDR104: 632 return true; 633 case MMC_TIMING_UHS_DDR50: 634 return !mmc_card_no_uhs_ddr50_tuning(card); 635 } 636 637 return false; 638 } 639 640 /* 641 * UHS-I specific initialization procedure 642 */ 643 static int mmc_sd_init_uhs_card(struct mmc_card *card) 644 { 645 int err; 646 u8 *status; 647 648 if (!(card->csd.cmdclass & CCC_SWITCH)) 649 return 0; 650 651 status = kmalloc(64, GFP_KERNEL); 652 if (!status) 653 return -ENOMEM; 654 655 /* Set 4-bit bus width */ 656 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 657 if (err) 658 goto out; 659 660 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 661 662 /* 663 * Select the bus speed mode depending on host 664 * and card capability. 665 */ 666 sd_update_bus_speed_mode(card); 667 668 /* Set the driver strength for the card */ 669 err = sd_select_driver_type(card, status); 670 if (err) 671 goto out; 672 673 /* Set current limit for the card */ 674 err = sd_set_current_limit(card, status); 675 if (err) 676 goto out; 677 678 /* Set bus speed mode of the card */ 679 err = sd_set_bus_speed_mode(card, status); 680 if (err) 681 goto out; 682 683 if (mmc_sd_use_tuning(card)) { 684 err = mmc_execute_tuning(card); 685 686 /* 687 * As SD Specifications Part1 Physical Layer Specification 688 * Version 3.01 says, CMD19 tuning is available for unlocked 689 * cards in transfer state of 1.8V signaling mode. The small 690 * difference between v3.00 and 3.01 spec means that CMD19 691 * tuning is also available for DDR50 mode. 692 */ 693 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) { 694 pr_warn("%s: ddr50 tuning failed\n", 695 mmc_hostname(card->host)); 696 err = 0; 697 } 698 } 699 700 out: 701 kfree(status); 702 703 return err; 704 } 705 706 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 707 card->raw_cid[2], card->raw_cid[3]); 708 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 709 card->raw_csd[2], card->raw_csd[3]); 710 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 711 MMC_DEV_ATTR(ssr, 712 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n", 713 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2], 714 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5], 715 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8], 716 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11], 717 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14], 718 card->raw_ssr[15]); 719 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 720 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 721 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 722 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 723 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 724 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 725 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 726 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 727 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 728 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr); 729 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca); 730 731 732 static ssize_t mmc_dsr_show(struct device *dev, struct device_attribute *attr, 733 char *buf) 734 { 735 struct mmc_card *card = mmc_dev_to_card(dev); 736 struct mmc_host *host = card->host; 737 738 if (card->csd.dsr_imp && host->dsr_req) 739 return sysfs_emit(buf, "0x%x\n", host->dsr); 740 /* return default DSR value */ 741 return sysfs_emit(buf, "0x%x\n", 0x404); 742 } 743 744 static DEVICE_ATTR(dsr, 0444, mmc_dsr_show, NULL); 745 746 MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor); 747 MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device); 748 MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev); 749 750 #define sdio_info_attr(num) \ 751 static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \ 752 { \ 753 struct mmc_card *card = mmc_dev_to_card(dev); \ 754 \ 755 if (num > card->num_info) \ 756 return -ENODATA; \ 757 if (!card->info[num - 1][0]) \ 758 return 0; \ 759 return sysfs_emit(buf, "%s\n", card->info[num - 1]); \ 760 } \ 761 static DEVICE_ATTR_RO(info##num) 762 763 sdio_info_attr(1); 764 sdio_info_attr(2); 765 sdio_info_attr(3); 766 sdio_info_attr(4); 767 768 static struct attribute *sd_std_attrs[] = { 769 &dev_attr_vendor.attr, 770 &dev_attr_device.attr, 771 &dev_attr_revision.attr, 772 &dev_attr_info1.attr, 773 &dev_attr_info2.attr, 774 &dev_attr_info3.attr, 775 &dev_attr_info4.attr, 776 &dev_attr_cid.attr, 777 &dev_attr_csd.attr, 778 &dev_attr_scr.attr, 779 &dev_attr_ssr.attr, 780 &dev_attr_date.attr, 781 &dev_attr_erase_size.attr, 782 &dev_attr_preferred_erase_size.attr, 783 &dev_attr_fwrev.attr, 784 &dev_attr_hwrev.attr, 785 &dev_attr_manfid.attr, 786 &dev_attr_name.attr, 787 &dev_attr_oemid.attr, 788 &dev_attr_serial.attr, 789 &dev_attr_ocr.attr, 790 &dev_attr_rca.attr, 791 &dev_attr_dsr.attr, 792 NULL, 793 }; 794 795 static umode_t sd_std_is_visible(struct kobject *kobj, struct attribute *attr, 796 int index) 797 { 798 struct device *dev = kobj_to_dev(kobj); 799 struct mmc_card *card = mmc_dev_to_card(dev); 800 801 /* CIS vendor and device ids, revision and info string are available only for Combo cards */ 802 if ((attr == &dev_attr_vendor.attr || 803 attr == &dev_attr_device.attr || 804 attr == &dev_attr_revision.attr || 805 attr == &dev_attr_info1.attr || 806 attr == &dev_attr_info2.attr || 807 attr == &dev_attr_info3.attr || 808 attr == &dev_attr_info4.attr 809 ) &&!mmc_card_sd_combo(card)) 810 return 0; 811 812 return attr->mode; 813 } 814 815 static const struct attribute_group sd_std_group = { 816 .attrs = sd_std_attrs, 817 .is_visible = sd_std_is_visible, 818 }; 819 __ATTRIBUTE_GROUPS(sd_std); 820 821 const struct device_type sd_type = { 822 .groups = sd_std_groups, 823 }; 824 825 /* 826 * Fetch CID from card. 827 */ 828 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 829 { 830 int err; 831 u32 max_current; 832 int retries = 10; 833 u32 pocr = ocr; 834 835 try_again: 836 if (!retries) { 837 ocr &= ~SD_OCR_S18R; 838 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 839 } 840 841 /* 842 * Since we're changing the OCR value, we seem to 843 * need to tell some cards to go back to the idle 844 * state. We wait 1ms to give cards time to 845 * respond. 846 */ 847 mmc_go_idle(host); 848 849 /* 850 * If SD_SEND_IF_COND indicates an SD 2.0 851 * compliant card and we should set bit 30 852 * of the ocr to indicate that we can handle 853 * block-addressed SDHC cards. 854 */ 855 err = mmc_send_if_cond(host, ocr); 856 if (!err) { 857 ocr |= SD_OCR_CCS; 858 /* Set HO2T as well - SDUC card won't respond otherwise */ 859 ocr |= SD_OCR_2T; 860 } 861 862 /* 863 * If the host supports one of UHS-I modes, request the card 864 * to switch to 1.8V signaling level. If the card has failed 865 * repeatedly to switch however, skip this. 866 */ 867 if (retries && mmc_host_can_uhs(host)) 868 ocr |= SD_OCR_S18R; 869 870 /* 871 * If the host can supply more than 150mA at current voltage, 872 * XPC should be set to 1. 873 */ 874 max_current = sd_get_host_max_current(host); 875 if (max_current > 150) 876 ocr |= SD_OCR_XPC; 877 878 err = mmc_send_app_op_cond(host, ocr, rocr); 879 if (err) 880 return err; 881 882 /* 883 * In case the S18A bit is set in the response, let's start the signal 884 * voltage switch procedure. SPI mode doesn't support CMD11. 885 * Note that, according to the spec, the S18A bit is not valid unless 886 * the CCS bit is set as well. We deliberately deviate from the spec in 887 * regards to this, which allows UHS-I to be supported for SDSC cards. 888 */ 889 if (!mmc_host_is_spi(host) && (ocr & SD_OCR_S18R) && 890 rocr && (*rocr & SD_ROCR_S18A)) { 891 err = mmc_set_uhs_voltage(host, pocr); 892 if (err == -EAGAIN) { 893 retries--; 894 goto try_again; 895 } else if (err) { 896 retries = 0; 897 goto try_again; 898 } 899 } 900 901 err = mmc_send_cid(host, cid); 902 return err; 903 } 904 905 int mmc_sd_get_csd(struct mmc_card *card, bool is_sduc) 906 { 907 int err; 908 909 /* 910 * Fetch CSD from card. 911 */ 912 err = mmc_send_csd(card, card->raw_csd); 913 if (err) 914 return err; 915 916 err = mmc_decode_csd(card, is_sduc); 917 if (err) 918 return err; 919 920 return 0; 921 } 922 923 int mmc_sd_get_ro(struct mmc_host *host) 924 { 925 int ro; 926 927 /* 928 * Some systems don't feature a write-protect pin and don't need one. 929 * E.g. because they only have micro-SD card slot. For those systems 930 * assume that the SD card is always read-write. 931 */ 932 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT) 933 return 0; 934 935 if (!host->ops->get_ro) 936 return -1; 937 938 ro = host->ops->get_ro(host); 939 940 return ro; 941 } 942 943 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 944 bool reinit) 945 { 946 int err; 947 948 if (!reinit) { 949 /* 950 * Fetch SCR from card. 951 */ 952 err = mmc_app_send_scr(card); 953 if (err) 954 return err; 955 956 err = mmc_decode_scr(card); 957 if (err) 958 return err; 959 960 /* 961 * Fetch and process SD Status register. 962 */ 963 err = mmc_read_ssr(card); 964 if (err) 965 return err; 966 967 /* Erase init depends on CSD and SSR */ 968 mmc_init_erase(card); 969 } 970 971 /* 972 * Fetch switch information from card. Note, sd3_bus_mode can change if 973 * voltage switch outcome changes, so do this always. 974 */ 975 err = mmc_read_switch(card); 976 if (err) 977 return err; 978 979 /* 980 * For SPI, enable CRC as appropriate. 981 * This CRC enable is located AFTER the reading of the 982 * card registers because some SDHC cards are not able 983 * to provide valid CRCs for non-512-byte blocks. 984 */ 985 if (mmc_host_is_spi(host)) { 986 err = mmc_spi_set_crc(host, use_spi_crc); 987 if (err) 988 return err; 989 } 990 991 /* 992 * Check if read-only switch is active. 993 */ 994 if (!reinit) { 995 int ro = mmc_sd_get_ro(host); 996 997 if (ro < 0) { 998 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n", 999 mmc_hostname(host)); 1000 } else if (ro > 0) { 1001 mmc_card_set_readonly(card); 1002 } 1003 } 1004 1005 return 0; 1006 } 1007 1008 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 1009 { 1010 unsigned max_dtr = (unsigned int)-1; 1011 1012 if (mmc_card_hs(card)) { 1013 if (max_dtr > card->sw_caps.hs_max_dtr) 1014 max_dtr = card->sw_caps.hs_max_dtr; 1015 } else if (max_dtr > card->csd.max_dtr) { 1016 max_dtr = card->csd.max_dtr; 1017 } 1018 1019 return max_dtr; 1020 } 1021 1022 static bool mmc_sd_card_using_v18(struct mmc_card *card) 1023 { 1024 /* 1025 * According to the SD spec., the Bus Speed Mode (function group 1) bits 1026 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus 1027 * they can be used to determine if the card has already switched to 1028 * 1.8V signaling. 1029 */ 1030 return card->sw_caps.sd3_bus_mode & 1031 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); 1032 } 1033 1034 static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 page, u16 offset, 1035 u8 reg_data) 1036 { 1037 struct mmc_host *host = card->host; 1038 struct mmc_request mrq = {}; 1039 struct mmc_command cmd = {}; 1040 struct mmc_data data = {}; 1041 struct scatterlist sg; 1042 u8 *reg_buf; 1043 1044 reg_buf = kzalloc(512, GFP_KERNEL); 1045 if (!reg_buf) 1046 return -ENOMEM; 1047 1048 mrq.cmd = &cmd; 1049 mrq.data = &data; 1050 1051 /* 1052 * Arguments of CMD49: 1053 * [31:31] MIO (0 = memory). 1054 * [30:27] FNO (function number). 1055 * [26:26] MW - mask write mode (0 = disable). 1056 * [25:18] page number. 1057 * [17:9] offset address. 1058 * [8:0] length (0 = 1 byte). 1059 */ 1060 cmd.arg = fno << 27 | page << 18 | offset << 9; 1061 1062 /* The first byte in the buffer is the data to be written. */ 1063 reg_buf[0] = reg_data; 1064 1065 data.flags = MMC_DATA_WRITE; 1066 data.blksz = 512; 1067 data.blocks = 1; 1068 data.sg = &sg; 1069 data.sg_len = 1; 1070 sg_init_one(&sg, reg_buf, 512); 1071 1072 cmd.opcode = SD_WRITE_EXTR_SINGLE; 1073 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; 1074 1075 mmc_set_data_timeout(&data, card); 1076 mmc_wait_for_req(host, &mrq); 1077 1078 kfree(reg_buf); 1079 1080 /* 1081 * Note that, the SD card is allowed to signal busy on DAT0 up to 1s 1082 * after the CMD49. Although, let's leave this to be managed by the 1083 * caller. 1084 */ 1085 1086 if (cmd.error) 1087 return cmd.error; 1088 if (data.error) 1089 return data.error; 1090 1091 return 0; 1092 } 1093 1094 static int sd_read_ext_reg(struct mmc_card *card, u8 fno, u8 page, 1095 u16 offset, u16 len, u8 *reg_buf) 1096 { 1097 u32 cmd_args; 1098 1099 /* 1100 * Command arguments of CMD48: 1101 * [31:31] MIO (0 = memory). 1102 * [30:27] FNO (function number). 1103 * [26:26] reserved (0). 1104 * [25:18] page number. 1105 * [17:9] offset address. 1106 * [8:0] length (0 = 1 byte, 1ff = 512 bytes). 1107 */ 1108 cmd_args = fno << 27 | page << 18 | offset << 9 | (len -1); 1109 1110 return mmc_send_adtc_data(card, card->host, SD_READ_EXTR_SINGLE, 1111 cmd_args, reg_buf, 512); 1112 } 1113 1114 static int sd_parse_ext_reg_power(struct mmc_card *card, u8 fno, u8 page, 1115 u16 offset) 1116 { 1117 int err; 1118 u8 *reg_buf; 1119 1120 reg_buf = kzalloc(512, GFP_KERNEL); 1121 if (!reg_buf) 1122 return -ENOMEM; 1123 1124 /* Read the extension register for power management function. */ 1125 err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf); 1126 if (err) { 1127 pr_warn("%s: error %d reading PM func of ext reg\n", 1128 mmc_hostname(card->host), err); 1129 goto out; 1130 } 1131 1132 /* PM revision consists of 4 bits. */ 1133 card->ext_power.rev = reg_buf[0] & 0xf; 1134 1135 /* Power Off Notification support at bit 4. */ 1136 if ((reg_buf[1] & BIT(4)) && !mmc_card_broken_sd_poweroff_notify(card)) 1137 card->ext_power.feature_support |= SD_EXT_POWER_OFF_NOTIFY; 1138 1139 /* Power Sustenance support at bit 5. */ 1140 if (reg_buf[1] & BIT(5)) 1141 card->ext_power.feature_support |= SD_EXT_POWER_SUSTENANCE; 1142 1143 /* Power Down Mode support at bit 6. */ 1144 if (reg_buf[1] & BIT(6)) 1145 card->ext_power.feature_support |= SD_EXT_POWER_DOWN_MODE; 1146 1147 card->ext_power.fno = fno; 1148 card->ext_power.page = page; 1149 card->ext_power.offset = offset; 1150 1151 out: 1152 kfree(reg_buf); 1153 return err; 1154 } 1155 1156 static int sd_parse_ext_reg_perf(struct mmc_card *card, u8 fno, u8 page, 1157 u16 offset) 1158 { 1159 int err; 1160 u8 *reg_buf; 1161 1162 reg_buf = kzalloc(512, GFP_KERNEL); 1163 if (!reg_buf) 1164 return -ENOMEM; 1165 1166 err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf); 1167 if (err) { 1168 pr_warn("%s: error %d reading PERF func of ext reg\n", 1169 mmc_hostname(card->host), err); 1170 goto out; 1171 } 1172 1173 /* PERF revision. */ 1174 card->ext_perf.rev = reg_buf[0]; 1175 1176 /* FX_EVENT support at bit 0. */ 1177 if (reg_buf[1] & BIT(0)) 1178 card->ext_perf.feature_support |= SD_EXT_PERF_FX_EVENT; 1179 1180 /* Card initiated self-maintenance support at bit 0. */ 1181 if (reg_buf[2] & BIT(0)) 1182 card->ext_perf.feature_support |= SD_EXT_PERF_CARD_MAINT; 1183 1184 /* Host initiated self-maintenance support at bit 1. */ 1185 if (reg_buf[2] & BIT(1)) 1186 card->ext_perf.feature_support |= SD_EXT_PERF_HOST_MAINT; 1187 1188 /* Cache support at bit 0. */ 1189 if ((reg_buf[4] & BIT(0)) && !mmc_card_broken_sd_cache(card)) 1190 card->ext_perf.feature_support |= SD_EXT_PERF_CACHE; 1191 1192 /* Command queue support indicated via queue depth bits (0 to 4). */ 1193 if (reg_buf[6] & 0x1f) 1194 card->ext_perf.feature_support |= SD_EXT_PERF_CMD_QUEUE; 1195 1196 card->ext_perf.fno = fno; 1197 card->ext_perf.page = page; 1198 card->ext_perf.offset = offset; 1199 1200 out: 1201 kfree(reg_buf); 1202 return err; 1203 } 1204 1205 static int sd_parse_ext_reg(struct mmc_card *card, u8 *gen_info_buf, 1206 u16 *next_ext_addr) 1207 { 1208 u8 num_regs, fno, page; 1209 u16 sfc, offset, ext = *next_ext_addr; 1210 u32 reg_addr; 1211 1212 /* 1213 * Parse only one register set per extension, as that is sufficient to 1214 * support the standard functions. This means another 48 bytes in the 1215 * buffer must be available. 1216 */ 1217 if (ext + 48 > 512) 1218 return -EFAULT; 1219 1220 /* Standard Function Code */ 1221 memcpy(&sfc, &gen_info_buf[ext], 2); 1222 1223 /* Address to the next extension. */ 1224 memcpy(next_ext_addr, &gen_info_buf[ext + 40], 2); 1225 1226 /* Number of registers for this extension. */ 1227 num_regs = gen_info_buf[ext + 42]; 1228 1229 /* We support only one register per extension. */ 1230 if (num_regs != 1) 1231 return 0; 1232 1233 /* Extension register address. */ 1234 memcpy(®_addr, &gen_info_buf[ext + 44], 4); 1235 1236 /* 9 bits (0 to 8) contains the offset address. */ 1237 offset = reg_addr & 0x1ff; 1238 1239 /* 8 bits (9 to 16) contains the page number. */ 1240 page = reg_addr >> 9 & 0xff ; 1241 1242 /* 4 bits (18 to 21) contains the function number. */ 1243 fno = reg_addr >> 18 & 0xf; 1244 1245 /* Standard Function Code for power management. */ 1246 if (sfc == 0x1) 1247 return sd_parse_ext_reg_power(card, fno, page, offset); 1248 1249 /* Standard Function Code for performance enhancement. */ 1250 if (sfc == 0x2) 1251 return sd_parse_ext_reg_perf(card, fno, page, offset); 1252 1253 return 0; 1254 } 1255 1256 static int sd_read_ext_regs(struct mmc_card *card) 1257 { 1258 int err, i; 1259 u8 num_ext, *gen_info_buf; 1260 u16 rev, len, next_ext_addr; 1261 1262 if (mmc_host_is_spi(card->host)) 1263 return 0; 1264 1265 if (!(card->scr.cmds & SD_SCR_CMD48_SUPPORT)) 1266 return 0; 1267 1268 gen_info_buf = kzalloc(512, GFP_KERNEL); 1269 if (!gen_info_buf) 1270 return -ENOMEM; 1271 1272 /* 1273 * Read 512 bytes of general info, which is found at function number 0, 1274 * at page 0 and with no offset. 1275 */ 1276 err = sd_read_ext_reg(card, 0, 0, 0, 512, gen_info_buf); 1277 if (err) { 1278 pr_err("%s: error %d reading general info of SD ext reg\n", 1279 mmc_hostname(card->host), err); 1280 goto out; 1281 } 1282 1283 /* General info structure revision. */ 1284 memcpy(&rev, &gen_info_buf[0], 2); 1285 1286 /* Length of general info in bytes. */ 1287 memcpy(&len, &gen_info_buf[2], 2); 1288 1289 /* Number of extensions to be find. */ 1290 num_ext = gen_info_buf[4]; 1291 1292 /* 1293 * We only support revision 0 and limit it to 512 bytes for simplicity. 1294 * No matter what, let's return zero to allow us to continue using the 1295 * card, even if we can't support the features from the SD function 1296 * extensions registers. 1297 */ 1298 if (rev != 0 || len > 512) { 1299 pr_warn("%s: non-supported SD ext reg layout\n", 1300 mmc_hostname(card->host)); 1301 goto out; 1302 } 1303 1304 /* 1305 * Parse the extension registers. The first extension should start 1306 * immediately after the general info header (16 bytes). 1307 */ 1308 next_ext_addr = 16; 1309 for (i = 0; i < num_ext; i++) { 1310 err = sd_parse_ext_reg(card, gen_info_buf, &next_ext_addr); 1311 if (err) { 1312 pr_err("%s: error %d parsing SD ext reg\n", 1313 mmc_hostname(card->host), err); 1314 goto out; 1315 } 1316 } 1317 1318 out: 1319 kfree(gen_info_buf); 1320 return err; 1321 } 1322 1323 static bool sd_cache_enabled(struct mmc_host *host) 1324 { 1325 return host->card->ext_perf.feature_enabled & SD_EXT_PERF_CACHE; 1326 } 1327 1328 static int sd_flush_cache(struct mmc_host *host) 1329 { 1330 struct mmc_card *card = host->card; 1331 u8 *reg_buf, fno, page; 1332 u16 offset; 1333 int err; 1334 1335 if (!sd_cache_enabled(host)) 1336 return 0; 1337 1338 reg_buf = kzalloc(512, GFP_KERNEL); 1339 if (!reg_buf) 1340 return -ENOMEM; 1341 1342 /* 1343 * Set Flush Cache at bit 0 in the performance enhancement register at 1344 * 261 bytes offset. 1345 */ 1346 fno = card->ext_perf.fno; 1347 page = card->ext_perf.page; 1348 offset = card->ext_perf.offset + 261; 1349 1350 err = sd_write_ext_reg(card, fno, page, offset, BIT(0)); 1351 if (err) { 1352 pr_warn("%s: error %d writing Cache Flush bit\n", 1353 mmc_hostname(host), err); 1354 goto out; 1355 } 1356 1357 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false, 1358 MMC_BUSY_EXTR_SINGLE); 1359 if (err) 1360 goto out; 1361 1362 /* 1363 * Read the Flush Cache bit. The card shall reset it, to confirm that 1364 * it's has completed the flushing of the cache. 1365 */ 1366 err = sd_read_ext_reg(card, fno, page, offset, 1, reg_buf); 1367 if (err) { 1368 pr_warn("%s: error %d reading Cache Flush bit\n", 1369 mmc_hostname(host), err); 1370 goto out; 1371 } 1372 1373 if (reg_buf[0] & BIT(0)) 1374 err = -ETIMEDOUT; 1375 out: 1376 kfree(reg_buf); 1377 return err; 1378 } 1379 1380 static int sd_enable_cache(struct mmc_card *card) 1381 { 1382 int err; 1383 1384 card->ext_perf.feature_enabled &= ~SD_EXT_PERF_CACHE; 1385 1386 /* 1387 * Set Cache Enable at bit 0 in the performance enhancement register at 1388 * 260 bytes offset. 1389 */ 1390 err = sd_write_ext_reg(card, card->ext_perf.fno, card->ext_perf.page, 1391 card->ext_perf.offset + 260, BIT(0)); 1392 if (err) { 1393 pr_warn("%s: error %d writing Cache Enable bit\n", 1394 mmc_hostname(card->host), err); 1395 return err; 1396 } 1397 1398 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false, 1399 MMC_BUSY_EXTR_SINGLE); 1400 if (!err) 1401 card->ext_perf.feature_enabled |= SD_EXT_PERF_CACHE; 1402 1403 return err; 1404 } 1405 1406 /* 1407 * Handle the detection and initialisation of a card. 1408 * 1409 * In the case of a resume, "oldcard" will contain the card 1410 * we're trying to reinitialise. 1411 */ 1412 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 1413 struct mmc_card *oldcard) 1414 { 1415 struct mmc_card *card; 1416 int err; 1417 u32 cid[4]; 1418 u32 rocr = 0; 1419 bool v18_fixup_failed = false; 1420 1421 WARN_ON(!host->claimed); 1422 retry: 1423 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 1424 if (err) 1425 return err; 1426 1427 if (oldcard) { 1428 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { 1429 pr_debug("%s: Perhaps the card was replaced\n", 1430 mmc_hostname(host)); 1431 return -ENOENT; 1432 } 1433 1434 card = oldcard; 1435 } else { 1436 /* 1437 * Allocate card structure. 1438 */ 1439 card = mmc_alloc_card(host, &sd_type); 1440 if (IS_ERR(card)) 1441 return PTR_ERR(card); 1442 1443 card->ocr = ocr; 1444 card->type = MMC_TYPE_SD; 1445 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 1446 } 1447 1448 /* 1449 * Call the optional HC's init_card function to handle quirks. 1450 */ 1451 if (host->ops->init_card) 1452 host->ops->init_card(host, card); 1453 1454 /* 1455 * For native busses: get card RCA and quit open drain mode. 1456 */ 1457 if (!mmc_host_is_spi(host)) { 1458 err = mmc_send_relative_addr(host, &card->rca); 1459 if (err) 1460 goto free_card; 1461 } 1462 1463 if (!oldcard) { 1464 u32 sduc_arg = SD_OCR_CCS | SD_OCR_2T; 1465 bool is_sduc = (rocr & sduc_arg) == sduc_arg; 1466 1467 err = mmc_sd_get_csd(card, is_sduc); 1468 if (err) 1469 goto free_card; 1470 1471 mmc_decode_cid(card); 1472 } 1473 1474 /* 1475 * handling only for cards supporting DSR and hosts requesting 1476 * DSR configuration 1477 */ 1478 if (card->csd.dsr_imp && host->dsr_req) 1479 mmc_set_dsr(host); 1480 1481 /* 1482 * Select card, as all following commands rely on that. 1483 */ 1484 if (!mmc_host_is_spi(host)) { 1485 err = mmc_select_card(card); 1486 if (err) 1487 goto free_card; 1488 } 1489 1490 /* Apply quirks prior to card setup */ 1491 mmc_fixup_device(card, mmc_sd_fixups); 1492 1493 err = mmc_sd_setup_card(host, card, oldcard != NULL); 1494 if (err) 1495 goto free_card; 1496 1497 /* 1498 * If the card has not been power cycled, it may still be using 1.8V 1499 * signaling. Detect that situation and try to initialize a UHS-I (1.8V) 1500 * transfer mode. 1501 */ 1502 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_can_uhs(host) && 1503 mmc_sd_card_using_v18(card) && 1504 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { 1505 if (mmc_host_set_uhs_voltage(host) || 1506 mmc_sd_init_uhs_card(card)) { 1507 v18_fixup_failed = true; 1508 mmc_power_cycle(host, ocr); 1509 if (!oldcard) 1510 mmc_remove_card(card); 1511 goto retry; 1512 } 1513 goto cont; 1514 } 1515 1516 /* Initialization sequence for UHS-I cards */ 1517 if (rocr & SD_ROCR_S18A && mmc_host_can_uhs(host)) { 1518 err = mmc_sd_init_uhs_card(card); 1519 if (err) 1520 goto free_card; 1521 } else { 1522 /* 1523 * Attempt to change to high-speed (if supported) 1524 */ 1525 err = mmc_sd_switch_hs(card); 1526 if (err > 0) 1527 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 1528 else if (err) 1529 goto free_card; 1530 1531 /* 1532 * Set bus speed. 1533 */ 1534 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 1535 1536 if (host->ios.timing == MMC_TIMING_SD_HS && 1537 host->ops->prepare_sd_hs_tuning) { 1538 err = host->ops->prepare_sd_hs_tuning(host, card); 1539 if (err) 1540 goto free_card; 1541 } 1542 1543 /* 1544 * Switch to wider bus (if supported). 1545 */ 1546 if ((host->caps & MMC_CAP_4_BIT_DATA) && 1547 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 1548 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 1549 if (err) 1550 goto free_card; 1551 1552 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1553 } 1554 1555 if (host->ios.timing == MMC_TIMING_SD_HS && 1556 host->ops->execute_sd_hs_tuning) { 1557 err = host->ops->execute_sd_hs_tuning(host, card); 1558 if (err) 1559 goto free_card; 1560 } 1561 } 1562 cont: 1563 if (!oldcard) { 1564 /* Read/parse the extension registers. */ 1565 err = sd_read_ext_regs(card); 1566 if (err) 1567 goto free_card; 1568 } 1569 1570 /* Enable internal SD cache if supported. */ 1571 if (card->ext_perf.feature_support & SD_EXT_PERF_CACHE) { 1572 err = sd_enable_cache(card); 1573 if (err) 1574 goto free_card; 1575 } 1576 1577 if (!mmc_card_ult_capacity(card) && host->cqe_ops && !host->cqe_enabled) { 1578 err = host->cqe_ops->cqe_enable(host, card); 1579 if (!err) { 1580 host->cqe_enabled = true; 1581 host->hsq_enabled = true; 1582 pr_info("%s: Host Software Queue enabled\n", 1583 mmc_hostname(host)); 1584 } 1585 } 1586 1587 if (host->caps2 & MMC_CAP2_AVOID_3_3V && 1588 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) { 1589 pr_err("%s: Host failed to negotiate down from 3.3V\n", 1590 mmc_hostname(host)); 1591 err = -EINVAL; 1592 goto free_card; 1593 } 1594 1595 host->card = card; 1596 return 0; 1597 1598 free_card: 1599 if (!oldcard) 1600 mmc_remove_card(card); 1601 1602 return err; 1603 } 1604 1605 /* 1606 * Card detection - card is alive. 1607 */ 1608 static int mmc_sd_alive(struct mmc_host *host) 1609 { 1610 return mmc_send_status(host->card, NULL); 1611 } 1612 1613 /* 1614 * Card detection callback from host. 1615 */ 1616 static void mmc_sd_detect(struct mmc_host *host) 1617 { 1618 int err; 1619 1620 mmc_get_card(host->card, NULL); 1621 1622 /* 1623 * Just check if our card has been removed. 1624 */ 1625 err = _mmc_detect_card_removed(host); 1626 1627 mmc_put_card(host->card, NULL); 1628 1629 if (err) { 1630 mmc_remove_card(host->card); 1631 host->card = NULL; 1632 1633 mmc_claim_host(host); 1634 mmc_detach_bus(host); 1635 mmc_power_off(host); 1636 mmc_release_host(host); 1637 } 1638 } 1639 1640 static int sd_can_poweroff_notify(struct mmc_card *card) 1641 { 1642 return card->ext_power.feature_support & SD_EXT_POWER_OFF_NOTIFY; 1643 } 1644 1645 static int sd_busy_poweroff_notify_cb(void *cb_data, bool *busy) 1646 { 1647 struct sd_busy_data *data = cb_data; 1648 struct mmc_card *card = data->card; 1649 int err; 1650 1651 /* 1652 * Read the status register for the power management function. It's at 1653 * one byte offset and is one byte long. The Power Off Notification 1654 * Ready is bit 0. 1655 */ 1656 err = sd_read_ext_reg(card, card->ext_power.fno, card->ext_power.page, 1657 card->ext_power.offset + 1, 1, data->reg_buf); 1658 if (err) { 1659 pr_warn("%s: error %d reading status reg of PM func\n", 1660 mmc_hostname(card->host), err); 1661 return err; 1662 } 1663 1664 *busy = !(data->reg_buf[0] & BIT(0)); 1665 return 0; 1666 } 1667 1668 static int sd_poweroff_notify(struct mmc_card *card) 1669 { 1670 struct sd_busy_data cb_data; 1671 u8 *reg_buf; 1672 int err; 1673 1674 reg_buf = kzalloc(512, GFP_KERNEL); 1675 if (!reg_buf) 1676 return -ENOMEM; 1677 1678 /* 1679 * Set the Power Off Notification bit in the power management settings 1680 * register at 2 bytes offset. 1681 */ 1682 err = sd_write_ext_reg(card, card->ext_power.fno, card->ext_power.page, 1683 card->ext_power.offset + 2, BIT(0)); 1684 if (err) { 1685 pr_warn("%s: error %d writing Power Off Notify bit\n", 1686 mmc_hostname(card->host), err); 1687 goto out; 1688 } 1689 1690 /* Find out when the command is completed. */ 1691 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false, 1692 MMC_BUSY_EXTR_SINGLE); 1693 if (err) 1694 goto out; 1695 1696 cb_data.card = card; 1697 cb_data.reg_buf = reg_buf; 1698 err = __mmc_poll_for_busy(card->host, 0, SD_POWEROFF_NOTIFY_TIMEOUT_MS, 1699 &sd_busy_poweroff_notify_cb, &cb_data); 1700 1701 out: 1702 kfree(reg_buf); 1703 return err; 1704 } 1705 1706 static int _mmc_sd_suspend(struct mmc_host *host) 1707 { 1708 struct mmc_card *card = host->card; 1709 int err = 0; 1710 1711 mmc_claim_host(host); 1712 1713 if (mmc_card_suspended(card)) 1714 goto out; 1715 1716 if (sd_can_poweroff_notify(card)) 1717 err = sd_poweroff_notify(card); 1718 else if (!mmc_host_is_spi(host)) 1719 err = mmc_deselect_cards(host); 1720 1721 if (!err) { 1722 mmc_power_off(host); 1723 mmc_card_set_suspended(card); 1724 } 1725 1726 out: 1727 mmc_release_host(host); 1728 return err; 1729 } 1730 1731 /* 1732 * Host is being removed. Free up the current card and do a graceful power-off. 1733 */ 1734 static void mmc_sd_remove(struct mmc_host *host) 1735 { 1736 get_device(&host->card->dev); 1737 mmc_remove_card(host->card); 1738 1739 _mmc_sd_suspend(host); 1740 1741 put_device(&host->card->dev); 1742 host->card = NULL; 1743 } 1744 /* 1745 * Callback for suspend 1746 */ 1747 static int mmc_sd_suspend(struct mmc_host *host) 1748 { 1749 int err; 1750 1751 err = _mmc_sd_suspend(host); 1752 if (!err) { 1753 pm_runtime_disable(&host->card->dev); 1754 pm_runtime_set_suspended(&host->card->dev); 1755 } 1756 1757 return err; 1758 } 1759 1760 /* 1761 * This function tries to determine if the same card is still present 1762 * and, if so, restore all state to it. 1763 */ 1764 static int _mmc_sd_resume(struct mmc_host *host) 1765 { 1766 int err = 0; 1767 1768 mmc_claim_host(host); 1769 1770 if (!mmc_card_suspended(host->card)) 1771 goto out; 1772 1773 mmc_power_up(host, host->card->ocr); 1774 err = mmc_sd_init_card(host, host->card->ocr, host->card); 1775 mmc_card_clr_suspended(host->card); 1776 1777 out: 1778 mmc_release_host(host); 1779 return err; 1780 } 1781 1782 /* 1783 * Callback for resume 1784 */ 1785 static int mmc_sd_resume(struct mmc_host *host) 1786 { 1787 pm_runtime_enable(&host->card->dev); 1788 return 0; 1789 } 1790 1791 /* 1792 * Callback for runtime_suspend. 1793 */ 1794 static int mmc_sd_runtime_suspend(struct mmc_host *host) 1795 { 1796 int err; 1797 1798 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) 1799 return 0; 1800 1801 err = _mmc_sd_suspend(host); 1802 if (err) 1803 pr_err("%s: error %d doing aggressive suspend\n", 1804 mmc_hostname(host), err); 1805 1806 return err; 1807 } 1808 1809 /* 1810 * Callback for runtime_resume. 1811 */ 1812 static int mmc_sd_runtime_resume(struct mmc_host *host) 1813 { 1814 int err; 1815 1816 err = _mmc_sd_resume(host); 1817 if (err && err != -ENOMEDIUM) 1818 pr_err("%s: error %d doing runtime resume\n", 1819 mmc_hostname(host), err); 1820 1821 return 0; 1822 } 1823 1824 static int mmc_sd_hw_reset(struct mmc_host *host) 1825 { 1826 mmc_power_cycle(host, host->card->ocr); 1827 return mmc_sd_init_card(host, host->card->ocr, host->card); 1828 } 1829 1830 static const struct mmc_bus_ops mmc_sd_ops = { 1831 .remove = mmc_sd_remove, 1832 .detect = mmc_sd_detect, 1833 .runtime_suspend = mmc_sd_runtime_suspend, 1834 .runtime_resume = mmc_sd_runtime_resume, 1835 .suspend = mmc_sd_suspend, 1836 .resume = mmc_sd_resume, 1837 .alive = mmc_sd_alive, 1838 .shutdown = mmc_sd_suspend, 1839 .hw_reset = mmc_sd_hw_reset, 1840 .cache_enabled = sd_cache_enabled, 1841 .flush_cache = sd_flush_cache, 1842 }; 1843 1844 /* 1845 * Starting point for SD card init. 1846 */ 1847 int mmc_attach_sd(struct mmc_host *host) 1848 { 1849 int err; 1850 u32 ocr, rocr; 1851 1852 WARN_ON(!host->claimed); 1853 1854 err = mmc_send_app_op_cond(host, 0, &ocr); 1855 if (err) 1856 return err; 1857 1858 mmc_attach_bus(host, &mmc_sd_ops); 1859 if (host->ocr_avail_sd) 1860 host->ocr_avail = host->ocr_avail_sd; 1861 1862 /* 1863 * We need to get OCR a different way for SPI. 1864 */ 1865 if (mmc_host_is_spi(host)) { 1866 mmc_go_idle(host); 1867 1868 err = mmc_spi_read_ocr(host, 0, &ocr); 1869 if (err) 1870 goto err; 1871 } 1872 1873 /* 1874 * Some SD cards claims an out of spec VDD voltage range. Let's treat 1875 * these bits as being in-valid and especially also bit7. 1876 */ 1877 ocr &= ~0x7FFF; 1878 1879 rocr = mmc_select_voltage(host, ocr); 1880 1881 /* 1882 * Can we support the voltage(s) of the card(s)? 1883 */ 1884 if (!rocr) { 1885 err = -EINVAL; 1886 goto err; 1887 } 1888 1889 /* 1890 * Detect and init the card. 1891 */ 1892 err = mmc_sd_init_card(host, rocr, NULL); 1893 if (err) 1894 goto err; 1895 1896 mmc_release_host(host); 1897 err = mmc_add_card(host->card); 1898 if (err) 1899 goto remove_card; 1900 1901 mmc_claim_host(host); 1902 return 0; 1903 1904 remove_card: 1905 mmc_remove_card(host->card); 1906 host->card = NULL; 1907 mmc_claim_host(host); 1908 err: 1909 mmc_detach_bus(host); 1910 1911 pr_err("%s: error %d whilst initialising SD card\n", 1912 mmc_hostname(host), err); 1913 1914 return err; 1915 } 1916