1 /* 2 * linux/drivers/mmc/core/sd.c 3 * 4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved. 5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. 6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/err.h> 14 #include <linux/slab.h> 15 16 #include <linux/mmc/host.h> 17 #include <linux/mmc/card.h> 18 #include <linux/mmc/mmc.h> 19 #include <linux/mmc/sd.h> 20 21 #include "core.h" 22 #include "bus.h" 23 #include "mmc_ops.h" 24 #include "sd.h" 25 #include "sd_ops.h" 26 27 static const unsigned int tran_exp[] = { 28 10000, 100000, 1000000, 10000000, 29 0, 0, 0, 0 30 }; 31 32 static const unsigned char tran_mant[] = { 33 0, 10, 12, 13, 15, 20, 25, 30, 34 35, 40, 45, 50, 55, 60, 70, 80, 35 }; 36 37 static const unsigned int tacc_exp[] = { 38 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 39 }; 40 41 static const unsigned int tacc_mant[] = { 42 0, 10, 12, 13, 15, 20, 25, 30, 43 35, 40, 45, 50, 55, 60, 70, 80, 44 }; 45 46 #define UNSTUFF_BITS(resp,start,size) \ 47 ({ \ 48 const int __size = size; \ 49 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 50 const int __off = 3 - ((start) / 32); \ 51 const int __shft = (start) & 31; \ 52 u32 __res; \ 53 \ 54 __res = resp[__off] >> __shft; \ 55 if (__size + __shft > 32) \ 56 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 57 __res & __mask; \ 58 }) 59 60 /* 61 * Given the decoded CSD structure, decode the raw CID to our CID structure. 62 */ 63 void mmc_decode_cid(struct mmc_card *card) 64 { 65 u32 *resp = card->raw_cid; 66 67 memset(&card->cid, 0, sizeof(struct mmc_cid)); 68 69 /* 70 * SD doesn't currently have a version field so we will 71 * have to assume we can parse this. 72 */ 73 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 74 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 75 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 76 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 77 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 78 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 79 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 80 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); 81 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); 82 card->cid.serial = UNSTUFF_BITS(resp, 24, 32); 83 card->cid.year = UNSTUFF_BITS(resp, 12, 8); 84 card->cid.month = UNSTUFF_BITS(resp, 8, 4); 85 86 card->cid.year += 2000; /* SD cards year offset */ 87 } 88 89 /* 90 * Given a 128-bit response, decode to our card CSD structure. 91 */ 92 static int mmc_decode_csd(struct mmc_card *card) 93 { 94 struct mmc_csd *csd = &card->csd; 95 unsigned int e, m, csd_struct; 96 u32 *resp = card->raw_csd; 97 98 csd_struct = UNSTUFF_BITS(resp, 126, 2); 99 100 switch (csd_struct) { 101 case 0: 102 m = UNSTUFF_BITS(resp, 115, 4); 103 e = UNSTUFF_BITS(resp, 112, 3); 104 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 105 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 106 107 m = UNSTUFF_BITS(resp, 99, 4); 108 e = UNSTUFF_BITS(resp, 96, 3); 109 csd->max_dtr = tran_exp[e] * tran_mant[m]; 110 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 111 112 e = UNSTUFF_BITS(resp, 47, 3); 113 m = UNSTUFF_BITS(resp, 62, 12); 114 csd->capacity = (1 + m) << (e + 2); 115 116 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 117 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 118 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 119 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 120 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 121 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 122 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 123 124 if (UNSTUFF_BITS(resp, 46, 1)) { 125 csd->erase_size = 1; 126 } else if (csd->write_blkbits >= 9) { 127 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; 128 csd->erase_size <<= csd->write_blkbits - 9; 129 } 130 break; 131 case 1: 132 /* 133 * This is a block-addressed SDHC or SDXC card. Most 134 * interesting fields are unused and have fixed 135 * values. To avoid getting tripped by buggy cards, 136 * we assume those fixed values ourselves. 137 */ 138 mmc_card_set_blockaddr(card); 139 140 csd->tacc_ns = 0; /* Unused */ 141 csd->tacc_clks = 0; /* Unused */ 142 143 m = UNSTUFF_BITS(resp, 99, 4); 144 e = UNSTUFF_BITS(resp, 96, 3); 145 csd->max_dtr = tran_exp[e] * tran_mant[m]; 146 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 147 csd->c_size = UNSTUFF_BITS(resp, 48, 22); 148 149 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */ 150 if (csd->c_size >= 0xFFFF) 151 mmc_card_set_ext_capacity(card); 152 153 m = UNSTUFF_BITS(resp, 48, 22); 154 csd->capacity = (1 + m) << 10; 155 156 csd->read_blkbits = 9; 157 csd->read_partial = 0; 158 csd->write_misalign = 0; 159 csd->read_misalign = 0; 160 csd->r2w_factor = 4; /* Unused */ 161 csd->write_blkbits = 9; 162 csd->write_partial = 0; 163 csd->erase_size = 1; 164 break; 165 default: 166 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n", 167 mmc_hostname(card->host), csd_struct); 168 return -EINVAL; 169 } 170 171 card->erase_size = csd->erase_size; 172 173 return 0; 174 } 175 176 /* 177 * Given a 64-bit response, decode to our card SCR structure. 178 */ 179 static int mmc_decode_scr(struct mmc_card *card) 180 { 181 struct sd_scr *scr = &card->scr; 182 unsigned int scr_struct; 183 u32 resp[4]; 184 185 resp[3] = card->raw_scr[1]; 186 resp[2] = card->raw_scr[0]; 187 188 scr_struct = UNSTUFF_BITS(resp, 60, 4); 189 if (scr_struct != 0) { 190 printk(KERN_ERR "%s: unrecognised SCR structure version %d\n", 191 mmc_hostname(card->host), scr_struct); 192 return -EINVAL; 193 } 194 195 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 196 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 197 if (scr->sda_vsn == SCR_SPEC_VER_2) 198 /* Check if Physical Layer Spec v3.0 is supported */ 199 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); 200 201 if (UNSTUFF_BITS(resp, 55, 1)) 202 card->erased_byte = 0xFF; 203 else 204 card->erased_byte = 0x0; 205 206 if (scr->sda_spec3) 207 scr->cmds = UNSTUFF_BITS(resp, 32, 2); 208 return 0; 209 } 210 211 /* 212 * Fetch and process SD Status register. 213 */ 214 static int mmc_read_ssr(struct mmc_card *card) 215 { 216 unsigned int au, es, et, eo; 217 int err, i; 218 u32 *ssr; 219 220 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 221 printk(KERN_WARNING "%s: card lacks mandatory SD Status " 222 "function.\n", mmc_hostname(card->host)); 223 return 0; 224 } 225 226 ssr = kmalloc(64, GFP_KERNEL); 227 if (!ssr) 228 return -ENOMEM; 229 230 err = mmc_app_sd_status(card, ssr); 231 if (err) { 232 printk(KERN_WARNING "%s: problem reading SD Status " 233 "register.\n", mmc_hostname(card->host)); 234 err = 0; 235 goto out; 236 } 237 238 for (i = 0; i < 16; i++) 239 ssr[i] = be32_to_cpu(ssr[i]); 240 241 /* 242 * UNSTUFF_BITS only works with four u32s so we have to offset the 243 * bitfield positions accordingly. 244 */ 245 au = UNSTUFF_BITS(ssr, 428 - 384, 4); 246 if (au > 0 || au <= 9) { 247 card->ssr.au = 1 << (au + 4); 248 es = UNSTUFF_BITS(ssr, 408 - 384, 16); 249 et = UNSTUFF_BITS(ssr, 402 - 384, 6); 250 eo = UNSTUFF_BITS(ssr, 400 - 384, 2); 251 if (es && et) { 252 card->ssr.erase_timeout = (et * 1000) / es; 253 card->ssr.erase_offset = eo * 1000; 254 } 255 } else { 256 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit " 257 "size.\n", mmc_hostname(card->host)); 258 } 259 out: 260 kfree(ssr); 261 return err; 262 } 263 264 /* 265 * Fetches and decodes switch information 266 */ 267 static int mmc_read_switch(struct mmc_card *card) 268 { 269 int err; 270 u8 *status; 271 272 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 273 return 0; 274 275 if (!(card->csd.cmdclass & CCC_SWITCH)) { 276 printk(KERN_WARNING "%s: card lacks mandatory switch " 277 "function, performance might suffer.\n", 278 mmc_hostname(card->host)); 279 return 0; 280 } 281 282 err = -EIO; 283 284 status = kmalloc(64, GFP_KERNEL); 285 if (!status) { 286 printk(KERN_ERR "%s: could not allocate a buffer for " 287 "switch capabilities.\n", 288 mmc_hostname(card->host)); 289 return -ENOMEM; 290 } 291 292 /* Find out the supported Bus Speed Modes. */ 293 err = mmc_sd_switch(card, 0, 0, 1, status); 294 if (err) { 295 /* 296 * If the host or the card can't do the switch, 297 * fail more gracefully. 298 */ 299 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 300 goto out; 301 302 printk(KERN_WARNING "%s: problem reading Bus Speed modes.\n", 303 mmc_hostname(card->host)); 304 err = 0; 305 306 goto out; 307 } 308 309 if (card->scr.sda_spec3) { 310 card->sw_caps.sd3_bus_mode = status[13]; 311 312 /* Find out Driver Strengths supported by the card */ 313 err = mmc_sd_switch(card, 0, 2, 1, status); 314 if (err) { 315 /* 316 * If the host or the card can't do the switch, 317 * fail more gracefully. 318 */ 319 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 320 goto out; 321 322 printk(KERN_WARNING "%s: problem reading " 323 "Driver Strength.\n", 324 mmc_hostname(card->host)); 325 err = 0; 326 327 goto out; 328 } 329 330 card->sw_caps.sd3_drv_type = status[9]; 331 332 /* Find out Current Limits supported by the card */ 333 err = mmc_sd_switch(card, 0, 3, 1, status); 334 if (err) { 335 /* 336 * If the host or the card can't do the switch, 337 * fail more gracefully. 338 */ 339 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 340 goto out; 341 342 printk(KERN_WARNING "%s: problem reading " 343 "Current Limit.\n", 344 mmc_hostname(card->host)); 345 err = 0; 346 347 goto out; 348 } 349 350 card->sw_caps.sd3_curr_limit = status[7]; 351 } else { 352 if (status[13] & 0x02) 353 card->sw_caps.hs_max_dtr = 50000000; 354 } 355 356 out: 357 kfree(status); 358 359 return err; 360 } 361 362 /* 363 * Test if the card supports high-speed mode and, if so, switch to it. 364 */ 365 int mmc_sd_switch_hs(struct mmc_card *card) 366 { 367 int err; 368 u8 *status; 369 370 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 371 return 0; 372 373 if (!(card->csd.cmdclass & CCC_SWITCH)) 374 return 0; 375 376 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 377 return 0; 378 379 if (card->sw_caps.hs_max_dtr == 0) 380 return 0; 381 382 err = -EIO; 383 384 status = kmalloc(64, GFP_KERNEL); 385 if (!status) { 386 printk(KERN_ERR "%s: could not allocate a buffer for " 387 "switch capabilities.\n", mmc_hostname(card->host)); 388 return -ENOMEM; 389 } 390 391 err = mmc_sd_switch(card, 1, 0, 1, status); 392 if (err) 393 goto out; 394 395 if ((status[16] & 0xF) != 1) { 396 printk(KERN_WARNING "%s: Problem switching card " 397 "into high-speed mode!\n", 398 mmc_hostname(card->host)); 399 err = 0; 400 } else { 401 err = 1; 402 } 403 404 out: 405 kfree(status); 406 407 return err; 408 } 409 410 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 411 { 412 int host_drv_type = SD_DRIVER_TYPE_B; 413 int card_drv_type = SD_DRIVER_TYPE_B; 414 int drive_strength; 415 int err; 416 417 /* 418 * If the host doesn't support any of the Driver Types A,C or D, 419 * or there is no board specific handler then default Driver 420 * Type B is used. 421 */ 422 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C 423 | MMC_CAP_DRIVER_TYPE_D))) 424 return 0; 425 426 if (!card->host->ops->select_drive_strength) 427 return 0; 428 429 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) 430 host_drv_type |= SD_DRIVER_TYPE_A; 431 432 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) 433 host_drv_type |= SD_DRIVER_TYPE_C; 434 435 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) 436 host_drv_type |= SD_DRIVER_TYPE_D; 437 438 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) 439 card_drv_type |= SD_DRIVER_TYPE_A; 440 441 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 442 card_drv_type |= SD_DRIVER_TYPE_C; 443 444 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D) 445 card_drv_type |= SD_DRIVER_TYPE_D; 446 447 /* 448 * The drive strength that the hardware can support 449 * depends on the board design. Pass the appropriate 450 * information and let the hardware specific code 451 * return what is possible given the options 452 */ 453 drive_strength = card->host->ops->select_drive_strength( 454 card->sw_caps.uhs_max_dtr, 455 host_drv_type, card_drv_type); 456 457 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 458 if (err) 459 return err; 460 461 if ((status[15] & 0xF) != drive_strength) { 462 printk(KERN_WARNING "%s: Problem setting drive strength!\n", 463 mmc_hostname(card->host)); 464 return 0; 465 } 466 467 mmc_set_driver_type(card->host, drive_strength); 468 469 return 0; 470 } 471 472 static void sd_update_bus_speed_mode(struct mmc_card *card) 473 { 474 /* 475 * If the host doesn't support any of the UHS-I modes, fallback on 476 * default speed. 477 */ 478 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 479 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) { 480 card->sd_bus_speed = 0; 481 return; 482 } 483 484 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 485 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 486 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 487 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 488 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 489 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 490 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 491 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 492 SD_MODE_UHS_SDR50)) { 493 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 494 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 495 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 496 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 497 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 498 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 499 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 500 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 501 SD_MODE_UHS_SDR12)) { 502 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 503 } 504 } 505 506 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 507 { 508 int err; 509 unsigned int timing = 0; 510 511 switch (card->sd_bus_speed) { 512 case UHS_SDR104_BUS_SPEED: 513 timing = MMC_TIMING_UHS_SDR104; 514 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 515 break; 516 case UHS_DDR50_BUS_SPEED: 517 timing = MMC_TIMING_UHS_DDR50; 518 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 519 break; 520 case UHS_SDR50_BUS_SPEED: 521 timing = MMC_TIMING_UHS_SDR50; 522 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 523 break; 524 case UHS_SDR25_BUS_SPEED: 525 timing = MMC_TIMING_UHS_SDR25; 526 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 527 break; 528 case UHS_SDR12_BUS_SPEED: 529 timing = MMC_TIMING_UHS_SDR12; 530 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 531 break; 532 default: 533 return 0; 534 } 535 536 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 537 if (err) 538 return err; 539 540 if ((status[16] & 0xF) != card->sd_bus_speed) 541 printk(KERN_WARNING "%s: Problem setting bus speed mode!\n", 542 mmc_hostname(card->host)); 543 else { 544 mmc_set_timing(card->host, timing); 545 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 546 } 547 548 return 0; 549 } 550 551 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 552 { 553 int current_limit = 0; 554 int err; 555 556 /* 557 * Current limit switch is only defined for SDR50, SDR104, and DDR50 558 * bus speed modes. For other bus speed modes, we set the default 559 * current limit of 200mA. 560 */ 561 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) || 562 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) || 563 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) { 564 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) { 565 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) 566 current_limit = SD_SET_CURRENT_LIMIT_800; 567 else if (card->sw_caps.sd3_curr_limit & 568 SD_MAX_CURRENT_600) 569 current_limit = SD_SET_CURRENT_LIMIT_600; 570 else if (card->sw_caps.sd3_curr_limit & 571 SD_MAX_CURRENT_400) 572 current_limit = SD_SET_CURRENT_LIMIT_400; 573 else if (card->sw_caps.sd3_curr_limit & 574 SD_MAX_CURRENT_200) 575 current_limit = SD_SET_CURRENT_LIMIT_200; 576 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) { 577 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) 578 current_limit = SD_SET_CURRENT_LIMIT_600; 579 else if (card->sw_caps.sd3_curr_limit & 580 SD_MAX_CURRENT_400) 581 current_limit = SD_SET_CURRENT_LIMIT_400; 582 else if (card->sw_caps.sd3_curr_limit & 583 SD_MAX_CURRENT_200) 584 current_limit = SD_SET_CURRENT_LIMIT_200; 585 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) { 586 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) 587 current_limit = SD_SET_CURRENT_LIMIT_400; 588 else if (card->sw_caps.sd3_curr_limit & 589 SD_MAX_CURRENT_200) 590 current_limit = SD_SET_CURRENT_LIMIT_200; 591 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) { 592 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) 593 current_limit = SD_SET_CURRENT_LIMIT_200; 594 } 595 } else 596 current_limit = SD_SET_CURRENT_LIMIT_200; 597 598 err = mmc_sd_switch(card, 1, 3, current_limit, status); 599 if (err) 600 return err; 601 602 if (((status[15] >> 4) & 0x0F) != current_limit) 603 printk(KERN_WARNING "%s: Problem setting current limit!\n", 604 mmc_hostname(card->host)); 605 606 return 0; 607 } 608 609 /* 610 * UHS-I specific initialization procedure 611 */ 612 static int mmc_sd_init_uhs_card(struct mmc_card *card) 613 { 614 int err; 615 u8 *status; 616 617 if (!card->scr.sda_spec3) 618 return 0; 619 620 if (!(card->csd.cmdclass & CCC_SWITCH)) 621 return 0; 622 623 status = kmalloc(64, GFP_KERNEL); 624 if (!status) { 625 printk(KERN_ERR "%s: could not allocate a buffer for " 626 "switch capabilities.\n", mmc_hostname(card->host)); 627 return -ENOMEM; 628 } 629 630 /* Set 4-bit bus width */ 631 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 632 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 633 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 634 if (err) 635 goto out; 636 637 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 638 } 639 640 /* 641 * Select the bus speed mode depending on host 642 * and card capability. 643 */ 644 sd_update_bus_speed_mode(card); 645 646 /* Set the driver strength for the card */ 647 err = sd_select_driver_type(card, status); 648 if (err) 649 goto out; 650 651 /* Set current limit for the card */ 652 err = sd_set_current_limit(card, status); 653 if (err) 654 goto out; 655 656 /* Set bus speed mode of the card */ 657 err = sd_set_bus_speed_mode(card, status); 658 if (err) 659 goto out; 660 661 /* SPI mode doesn't define CMD19 */ 662 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) 663 err = card->host->ops->execute_tuning(card->host); 664 665 out: 666 kfree(status); 667 668 return err; 669 } 670 671 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 672 card->raw_cid[2], card->raw_cid[3]); 673 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 674 card->raw_csd[2], card->raw_csd[3]); 675 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 676 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 677 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 678 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 679 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 680 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 681 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 682 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 683 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 684 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 685 686 687 static struct attribute *sd_std_attrs[] = { 688 &dev_attr_cid.attr, 689 &dev_attr_csd.attr, 690 &dev_attr_scr.attr, 691 &dev_attr_date.attr, 692 &dev_attr_erase_size.attr, 693 &dev_attr_preferred_erase_size.attr, 694 &dev_attr_fwrev.attr, 695 &dev_attr_hwrev.attr, 696 &dev_attr_manfid.attr, 697 &dev_attr_name.attr, 698 &dev_attr_oemid.attr, 699 &dev_attr_serial.attr, 700 NULL, 701 }; 702 703 static struct attribute_group sd_std_attr_group = { 704 .attrs = sd_std_attrs, 705 }; 706 707 static const struct attribute_group *sd_attr_groups[] = { 708 &sd_std_attr_group, 709 NULL, 710 }; 711 712 struct device_type sd_type = { 713 .groups = sd_attr_groups, 714 }; 715 716 /* 717 * Fetch CID from card. 718 */ 719 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 720 { 721 int err; 722 723 /* 724 * Since we're changing the OCR value, we seem to 725 * need to tell some cards to go back to the idle 726 * state. We wait 1ms to give cards time to 727 * respond. 728 */ 729 mmc_go_idle(host); 730 731 /* 732 * If SD_SEND_IF_COND indicates an SD 2.0 733 * compliant card and we should set bit 30 734 * of the ocr to indicate that we can handle 735 * block-addressed SDHC cards. 736 */ 737 err = mmc_send_if_cond(host, ocr); 738 if (!err) 739 ocr |= SD_OCR_CCS; 740 741 /* 742 * If the host supports one of UHS-I modes, request the card 743 * to switch to 1.8V signaling level. 744 */ 745 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 746 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)) 747 ocr |= SD_OCR_S18R; 748 749 /* If the host can supply more than 150mA, XPC should be set to 1. */ 750 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 | 751 MMC_CAP_SET_XPC_180)) 752 ocr |= SD_OCR_XPC; 753 754 try_again: 755 err = mmc_send_app_op_cond(host, ocr, rocr); 756 if (err) 757 return err; 758 759 /* 760 * In case CCS and S18A in the response is set, start Signal Voltage 761 * Switch procedure. SPI mode doesn't support CMD11. 762 */ 763 if (!mmc_host_is_spi(host) && rocr && 764 ((*rocr & 0x41000000) == 0x41000000)) { 765 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true); 766 if (err) { 767 ocr &= ~SD_OCR_S18R; 768 goto try_again; 769 } 770 } 771 772 if (mmc_host_is_spi(host)) 773 err = mmc_send_cid(host, cid); 774 else 775 err = mmc_all_send_cid(host, cid); 776 777 return err; 778 } 779 780 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 781 { 782 int err; 783 784 /* 785 * Fetch CSD from card. 786 */ 787 err = mmc_send_csd(card, card->raw_csd); 788 if (err) 789 return err; 790 791 err = mmc_decode_csd(card); 792 if (err) 793 return err; 794 795 return 0; 796 } 797 798 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 799 bool reinit) 800 { 801 int err; 802 803 if (!reinit) { 804 /* 805 * Fetch SCR from card. 806 */ 807 err = mmc_app_send_scr(card, card->raw_scr); 808 if (err) 809 return err; 810 811 err = mmc_decode_scr(card); 812 if (err) 813 return err; 814 815 /* 816 * Fetch and process SD Status register. 817 */ 818 err = mmc_read_ssr(card); 819 if (err) 820 return err; 821 822 /* Erase init depends on CSD and SSR */ 823 mmc_init_erase(card); 824 825 /* 826 * Fetch switch information from card. 827 */ 828 err = mmc_read_switch(card); 829 if (err) 830 return err; 831 } 832 833 /* 834 * For SPI, enable CRC as appropriate. 835 * This CRC enable is located AFTER the reading of the 836 * card registers because some SDHC cards are not able 837 * to provide valid CRCs for non-512-byte blocks. 838 */ 839 if (mmc_host_is_spi(host)) { 840 err = mmc_spi_set_crc(host, use_spi_crc); 841 if (err) 842 return err; 843 } 844 845 /* 846 * Check if read-only switch is active. 847 */ 848 if (!reinit) { 849 int ro = -1; 850 851 if (host->ops->get_ro) 852 ro = host->ops->get_ro(host); 853 854 if (ro < 0) { 855 printk(KERN_WARNING "%s: host does not " 856 "support reading read-only " 857 "switch. assuming write-enable.\n", 858 mmc_hostname(host)); 859 } else if (ro > 0) { 860 mmc_card_set_readonly(card); 861 } 862 } 863 864 return 0; 865 } 866 867 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 868 { 869 unsigned max_dtr = (unsigned int)-1; 870 871 if (mmc_card_highspeed(card)) { 872 if (max_dtr > card->sw_caps.hs_max_dtr) 873 max_dtr = card->sw_caps.hs_max_dtr; 874 } else if (max_dtr > card->csd.max_dtr) { 875 max_dtr = card->csd.max_dtr; 876 } 877 878 return max_dtr; 879 } 880 881 void mmc_sd_go_highspeed(struct mmc_card *card) 882 { 883 mmc_card_set_highspeed(card); 884 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 885 } 886 887 /* 888 * Handle the detection and initialisation of a card. 889 * 890 * In the case of a resume, "oldcard" will contain the card 891 * we're trying to reinitialise. 892 */ 893 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 894 struct mmc_card *oldcard) 895 { 896 struct mmc_card *card; 897 int err; 898 u32 cid[4]; 899 u32 rocr = 0; 900 901 BUG_ON(!host); 902 WARN_ON(!host->claimed); 903 904 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 905 if (err) 906 return err; 907 908 if (oldcard) { 909 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 910 return -ENOENT; 911 912 card = oldcard; 913 } else { 914 /* 915 * Allocate card structure. 916 */ 917 card = mmc_alloc_card(host, &sd_type); 918 if (IS_ERR(card)) 919 return PTR_ERR(card); 920 921 card->type = MMC_TYPE_SD; 922 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 923 } 924 925 /* 926 * For native busses: get card RCA and quit open drain mode. 927 */ 928 if (!mmc_host_is_spi(host)) { 929 err = mmc_send_relative_addr(host, &card->rca); 930 if (err) 931 return err; 932 933 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); 934 } 935 936 if (!oldcard) { 937 err = mmc_sd_get_csd(host, card); 938 if (err) 939 return err; 940 941 mmc_decode_cid(card); 942 } 943 944 /* 945 * Select card, as all following commands rely on that. 946 */ 947 if (!mmc_host_is_spi(host)) { 948 err = mmc_select_card(card); 949 if (err) 950 return err; 951 } 952 953 err = mmc_sd_setup_card(host, card, oldcard != NULL); 954 if (err) 955 goto free_card; 956 957 /* Initialization sequence for UHS-I cards */ 958 if (rocr & SD_ROCR_S18A) { 959 err = mmc_sd_init_uhs_card(card); 960 if (err) 961 goto free_card; 962 963 /* Card is an ultra-high-speed card */ 964 mmc_sd_card_set_uhs(card); 965 966 /* 967 * Since initialization is now complete, enable preset 968 * value registers for UHS-I cards. 969 */ 970 if (host->ops->enable_preset_value) 971 host->ops->enable_preset_value(host, true); 972 } else { 973 /* 974 * Attempt to change to high-speed (if supported) 975 */ 976 err = mmc_sd_switch_hs(card); 977 if (err > 0) 978 mmc_sd_go_highspeed(card); 979 else if (err) 980 goto free_card; 981 982 /* 983 * Set bus speed. 984 */ 985 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 986 987 /* 988 * Switch to wider bus (if supported). 989 */ 990 if ((host->caps & MMC_CAP_4_BIT_DATA) && 991 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 992 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 993 if (err) 994 goto free_card; 995 996 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 997 } 998 } 999 1000 host->card = card; 1001 return 0; 1002 1003 free_card: 1004 if (!oldcard) 1005 mmc_remove_card(card); 1006 1007 return err; 1008 } 1009 1010 /* 1011 * Host is being removed. Free up the current card. 1012 */ 1013 static void mmc_sd_remove(struct mmc_host *host) 1014 { 1015 BUG_ON(!host); 1016 BUG_ON(!host->card); 1017 1018 mmc_remove_card(host->card); 1019 host->card = NULL; 1020 } 1021 1022 /* 1023 * Card detection callback from host. 1024 */ 1025 static void mmc_sd_detect(struct mmc_host *host) 1026 { 1027 int err; 1028 1029 BUG_ON(!host); 1030 BUG_ON(!host->card); 1031 1032 mmc_claim_host(host); 1033 1034 /* 1035 * Just check if our card has been removed. 1036 */ 1037 err = mmc_send_status(host->card, NULL); 1038 1039 mmc_release_host(host); 1040 1041 if (err) { 1042 mmc_sd_remove(host); 1043 1044 mmc_claim_host(host); 1045 mmc_detach_bus(host); 1046 mmc_release_host(host); 1047 } 1048 } 1049 1050 /* 1051 * Suspend callback from host. 1052 */ 1053 static int mmc_sd_suspend(struct mmc_host *host) 1054 { 1055 BUG_ON(!host); 1056 BUG_ON(!host->card); 1057 1058 mmc_claim_host(host); 1059 if (!mmc_host_is_spi(host)) 1060 mmc_deselect_cards(host); 1061 host->card->state &= ~MMC_STATE_HIGHSPEED; 1062 mmc_release_host(host); 1063 1064 return 0; 1065 } 1066 1067 /* 1068 * Resume callback from host. 1069 * 1070 * This function tries to determine if the same card is still present 1071 * and, if so, restore all state to it. 1072 */ 1073 static int mmc_sd_resume(struct mmc_host *host) 1074 { 1075 int err; 1076 1077 BUG_ON(!host); 1078 BUG_ON(!host->card); 1079 1080 mmc_claim_host(host); 1081 err = mmc_sd_init_card(host, host->ocr, host->card); 1082 mmc_release_host(host); 1083 1084 return err; 1085 } 1086 1087 static int mmc_sd_power_restore(struct mmc_host *host) 1088 { 1089 int ret; 1090 1091 host->card->state &= ~MMC_STATE_HIGHSPEED; 1092 mmc_claim_host(host); 1093 ret = mmc_sd_init_card(host, host->ocr, host->card); 1094 mmc_release_host(host); 1095 1096 return ret; 1097 } 1098 1099 static const struct mmc_bus_ops mmc_sd_ops = { 1100 .remove = mmc_sd_remove, 1101 .detect = mmc_sd_detect, 1102 .suspend = NULL, 1103 .resume = NULL, 1104 .power_restore = mmc_sd_power_restore, 1105 }; 1106 1107 static const struct mmc_bus_ops mmc_sd_ops_unsafe = { 1108 .remove = mmc_sd_remove, 1109 .detect = mmc_sd_detect, 1110 .suspend = mmc_sd_suspend, 1111 .resume = mmc_sd_resume, 1112 .power_restore = mmc_sd_power_restore, 1113 }; 1114 1115 static void mmc_sd_attach_bus_ops(struct mmc_host *host) 1116 { 1117 const struct mmc_bus_ops *bus_ops; 1118 1119 if (!mmc_card_is_removable(host)) 1120 bus_ops = &mmc_sd_ops_unsafe; 1121 else 1122 bus_ops = &mmc_sd_ops; 1123 mmc_attach_bus(host, bus_ops); 1124 } 1125 1126 /* 1127 * Starting point for SD card init. 1128 */ 1129 int mmc_attach_sd(struct mmc_host *host) 1130 { 1131 int err; 1132 u32 ocr; 1133 1134 BUG_ON(!host); 1135 WARN_ON(!host->claimed); 1136 1137 /* Make sure we are at 3.3V signalling voltage */ 1138 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false); 1139 if (err) 1140 return err; 1141 1142 /* Disable preset value enable if already set since last time */ 1143 if (host->ops->enable_preset_value) 1144 host->ops->enable_preset_value(host, false); 1145 1146 err = mmc_send_app_op_cond(host, 0, &ocr); 1147 if (err) 1148 return err; 1149 1150 mmc_sd_attach_bus_ops(host); 1151 if (host->ocr_avail_sd) 1152 host->ocr_avail = host->ocr_avail_sd; 1153 1154 /* 1155 * We need to get OCR a different way for SPI. 1156 */ 1157 if (mmc_host_is_spi(host)) { 1158 mmc_go_idle(host); 1159 1160 err = mmc_spi_read_ocr(host, 0, &ocr); 1161 if (err) 1162 goto err; 1163 } 1164 1165 /* 1166 * Sanity check the voltages that the card claims to 1167 * support. 1168 */ 1169 if (ocr & 0x7F) { 1170 printk(KERN_WARNING "%s: card claims to support voltages " 1171 "below the defined range. These will be ignored.\n", 1172 mmc_hostname(host)); 1173 ocr &= ~0x7F; 1174 } 1175 1176 if ((ocr & MMC_VDD_165_195) && 1177 !(host->ocr_avail_sd & MMC_VDD_165_195)) { 1178 printk(KERN_WARNING "%s: SD card claims to support the " 1179 "incompletely defined 'low voltage range'. This " 1180 "will be ignored.\n", mmc_hostname(host)); 1181 ocr &= ~MMC_VDD_165_195; 1182 } 1183 1184 host->ocr = mmc_select_voltage(host, ocr); 1185 1186 /* 1187 * Can we support the voltage(s) of the card(s)? 1188 */ 1189 if (!host->ocr) { 1190 err = -EINVAL; 1191 goto err; 1192 } 1193 1194 /* 1195 * Detect and init the card. 1196 */ 1197 err = mmc_sd_init_card(host, host->ocr, NULL); 1198 if (err) 1199 goto err; 1200 1201 mmc_release_host(host); 1202 err = mmc_add_card(host->card); 1203 mmc_claim_host(host); 1204 if (err) 1205 goto remove_card; 1206 1207 return 0; 1208 1209 remove_card: 1210 mmc_release_host(host); 1211 mmc_remove_card(host->card); 1212 host->card = NULL; 1213 mmc_claim_host(host); 1214 err: 1215 mmc_detach_bus(host); 1216 1217 printk(KERN_ERR "%s: error %d whilst initialising SD card\n", 1218 mmc_hostname(host), err); 1219 1220 return err; 1221 } 1222 1223