1 /* 2 * drivers/mmc/host/omap_hsmmc.c 3 * 4 * Driver for OMAP2430/3430 MMC controller. 5 * 6 * Copyright (C) 2007 Texas Instruments. 7 * 8 * Authors: 9 * Syed Mohammed Khasim <x0khasim@ti.com> 10 * Madhusudhan <madhu.cr@ti.com> 11 * Mohit Jalori <mjalori@ti.com> 12 * 13 * This file is licensed under the terms of the GNU General Public License 14 * version 2. This program is licensed "as is" without any warranty of any 15 * kind, whether express or implied. 16 */ 17 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/kernel.h> 21 #include <linux/debugfs.h> 22 #include <linux/dmaengine.h> 23 #include <linux/seq_file.h> 24 #include <linux/sizes.h> 25 #include <linux/interrupt.h> 26 #include <linux/delay.h> 27 #include <linux/dma-mapping.h> 28 #include <linux/platform_device.h> 29 #include <linux/timer.h> 30 #include <linux/clk.h> 31 #include <linux/of.h> 32 #include <linux/of_irq.h> 33 #include <linux/of_gpio.h> 34 #include <linux/of_device.h> 35 #include <linux/mmc/host.h> 36 #include <linux/mmc/core.h> 37 #include <linux/mmc/mmc.h> 38 #include <linux/mmc/slot-gpio.h> 39 #include <linux/io.h> 40 #include <linux/irq.h> 41 #include <linux/gpio.h> 42 #include <linux/regulator/consumer.h> 43 #include <linux/pinctrl/consumer.h> 44 #include <linux/pm_runtime.h> 45 #include <linux/pm_wakeirq.h> 46 #include <linux/platform_data/hsmmc-omap.h> 47 48 /* OMAP HSMMC Host Controller Registers */ 49 #define OMAP_HSMMC_SYSSTATUS 0x0014 50 #define OMAP_HSMMC_CON 0x002C 51 #define OMAP_HSMMC_SDMASA 0x0100 52 #define OMAP_HSMMC_BLK 0x0104 53 #define OMAP_HSMMC_ARG 0x0108 54 #define OMAP_HSMMC_CMD 0x010C 55 #define OMAP_HSMMC_RSP10 0x0110 56 #define OMAP_HSMMC_RSP32 0x0114 57 #define OMAP_HSMMC_RSP54 0x0118 58 #define OMAP_HSMMC_RSP76 0x011C 59 #define OMAP_HSMMC_DATA 0x0120 60 #define OMAP_HSMMC_PSTATE 0x0124 61 #define OMAP_HSMMC_HCTL 0x0128 62 #define OMAP_HSMMC_SYSCTL 0x012C 63 #define OMAP_HSMMC_STAT 0x0130 64 #define OMAP_HSMMC_IE 0x0134 65 #define OMAP_HSMMC_ISE 0x0138 66 #define OMAP_HSMMC_AC12 0x013C 67 #define OMAP_HSMMC_CAPA 0x0140 68 69 #define VS18 (1 << 26) 70 #define VS30 (1 << 25) 71 #define HSS (1 << 21) 72 #define SDVS18 (0x5 << 9) 73 #define SDVS30 (0x6 << 9) 74 #define SDVS33 (0x7 << 9) 75 #define SDVS_MASK 0x00000E00 76 #define SDVSCLR 0xFFFFF1FF 77 #define SDVSDET 0x00000400 78 #define AUTOIDLE 0x1 79 #define SDBP (1 << 8) 80 #define DTO 0xe 81 #define ICE 0x1 82 #define ICS 0x2 83 #define CEN (1 << 2) 84 #define CLKD_MAX 0x3FF /* max clock divisor: 1023 */ 85 #define CLKD_MASK 0x0000FFC0 86 #define CLKD_SHIFT 6 87 #define DTO_MASK 0x000F0000 88 #define DTO_SHIFT 16 89 #define INIT_STREAM (1 << 1) 90 #define ACEN_ACMD23 (2 << 2) 91 #define DP_SELECT (1 << 21) 92 #define DDIR (1 << 4) 93 #define DMAE 0x1 94 #define MSBS (1 << 5) 95 #define BCE (1 << 1) 96 #define FOUR_BIT (1 << 1) 97 #define HSPE (1 << 2) 98 #define IWE (1 << 24) 99 #define DDR (1 << 19) 100 #define CLKEXTFREE (1 << 16) 101 #define CTPL (1 << 11) 102 #define DW8 (1 << 5) 103 #define OD 0x1 104 #define STAT_CLEAR 0xFFFFFFFF 105 #define INIT_STREAM_CMD 0x00000000 106 #define DUAL_VOLT_OCR_BIT 7 107 #define SRC (1 << 25) 108 #define SRD (1 << 26) 109 #define SOFTRESET (1 << 1) 110 111 /* PSTATE */ 112 #define DLEV_DAT(x) (1 << (20 + (x))) 113 114 /* Interrupt masks for IE and ISE register */ 115 #define CC_EN (1 << 0) 116 #define TC_EN (1 << 1) 117 #define BWR_EN (1 << 4) 118 #define BRR_EN (1 << 5) 119 #define CIRQ_EN (1 << 8) 120 #define ERR_EN (1 << 15) 121 #define CTO_EN (1 << 16) 122 #define CCRC_EN (1 << 17) 123 #define CEB_EN (1 << 18) 124 #define CIE_EN (1 << 19) 125 #define DTO_EN (1 << 20) 126 #define DCRC_EN (1 << 21) 127 #define DEB_EN (1 << 22) 128 #define ACE_EN (1 << 24) 129 #define CERR_EN (1 << 28) 130 #define BADA_EN (1 << 29) 131 132 #define INT_EN_MASK (BADA_EN | CERR_EN | ACE_EN | DEB_EN | DCRC_EN |\ 133 DTO_EN | CIE_EN | CEB_EN | CCRC_EN | CTO_EN | \ 134 BRR_EN | BWR_EN | TC_EN | CC_EN) 135 136 #define CNI (1 << 7) 137 #define ACIE (1 << 4) 138 #define ACEB (1 << 3) 139 #define ACCE (1 << 2) 140 #define ACTO (1 << 1) 141 #define ACNE (1 << 0) 142 143 #define MMC_AUTOSUSPEND_DELAY 100 144 #define MMC_TIMEOUT_MS 20 /* 20 mSec */ 145 #define MMC_TIMEOUT_US 20000 /* 20000 micro Sec */ 146 #define OMAP_MMC_MIN_CLOCK 400000 147 #define OMAP_MMC_MAX_CLOCK 52000000 148 #define DRIVER_NAME "omap_hsmmc" 149 150 #define VDD_1V8 1800000 /* 180000 uV */ 151 #define VDD_3V0 3000000 /* 300000 uV */ 152 #define VDD_165_195 (ffs(MMC_VDD_165_195) - 1) 153 154 /* 155 * One controller can have multiple slots, like on some omap boards using 156 * omap.c controller driver. Luckily this is not currently done on any known 157 * omap_hsmmc.c device. 158 */ 159 #define mmc_pdata(host) host->pdata 160 161 /* 162 * MMC Host controller read/write API's 163 */ 164 #define OMAP_HSMMC_READ(base, reg) \ 165 __raw_readl((base) + OMAP_HSMMC_##reg) 166 167 #define OMAP_HSMMC_WRITE(base, reg, val) \ 168 __raw_writel((val), (base) + OMAP_HSMMC_##reg) 169 170 struct omap_hsmmc_next { 171 unsigned int dma_len; 172 s32 cookie; 173 }; 174 175 struct omap_hsmmc_host { 176 struct device *dev; 177 struct mmc_host *mmc; 178 struct mmc_request *mrq; 179 struct mmc_command *cmd; 180 struct mmc_data *data; 181 struct clk *fclk; 182 struct clk *dbclk; 183 struct regulator *pbias; 184 bool pbias_enabled; 185 void __iomem *base; 186 int vqmmc_enabled; 187 resource_size_t mapbase; 188 spinlock_t irq_lock; /* Prevent races with irq handler */ 189 unsigned int dma_len; 190 unsigned int dma_sg_idx; 191 unsigned char bus_mode; 192 unsigned char power_mode; 193 int suspended; 194 u32 con; 195 u32 hctl; 196 u32 sysctl; 197 u32 capa; 198 int irq; 199 int wake_irq; 200 int use_dma, dma_ch; 201 struct dma_chan *tx_chan; 202 struct dma_chan *rx_chan; 203 int response_busy; 204 int context_loss; 205 int protect_card; 206 int reqs_blocked; 207 int req_in_progress; 208 unsigned long clk_rate; 209 unsigned int flags; 210 #define AUTO_CMD23 (1 << 0) /* Auto CMD23 support */ 211 #define HSMMC_SDIO_IRQ_ENABLED (1 << 1) /* SDIO irq enabled */ 212 struct omap_hsmmc_next next_data; 213 struct omap_hsmmc_platform_data *pdata; 214 215 /* return MMC cover switch state, can be NULL if not supported. 216 * 217 * possible return values: 218 * 0 - closed 219 * 1 - open 220 */ 221 int (*get_cover_state)(struct device *dev); 222 223 int (*card_detect)(struct device *dev); 224 }; 225 226 struct omap_mmc_of_data { 227 u32 reg_offset; 228 u8 controller_flags; 229 }; 230 231 static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host); 232 233 static int omap_hsmmc_card_detect(struct device *dev) 234 { 235 struct omap_hsmmc_host *host = dev_get_drvdata(dev); 236 237 return mmc_gpio_get_cd(host->mmc); 238 } 239 240 static int omap_hsmmc_get_cover_state(struct device *dev) 241 { 242 struct omap_hsmmc_host *host = dev_get_drvdata(dev); 243 244 return mmc_gpio_get_cd(host->mmc); 245 } 246 247 static int omap_hsmmc_enable_supply(struct mmc_host *mmc) 248 { 249 int ret; 250 struct omap_hsmmc_host *host = mmc_priv(mmc); 251 struct mmc_ios *ios = &mmc->ios; 252 253 if (mmc->supply.vmmc) { 254 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd); 255 if (ret) 256 return ret; 257 } 258 259 /* Enable interface voltage rail, if needed */ 260 if (mmc->supply.vqmmc && !host->vqmmc_enabled) { 261 ret = regulator_enable(mmc->supply.vqmmc); 262 if (ret) { 263 dev_err(mmc_dev(mmc), "vmmc_aux reg enable failed\n"); 264 goto err_vqmmc; 265 } 266 host->vqmmc_enabled = 1; 267 } 268 269 return 0; 270 271 err_vqmmc: 272 if (mmc->supply.vmmc) 273 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); 274 275 return ret; 276 } 277 278 static int omap_hsmmc_disable_supply(struct mmc_host *mmc) 279 { 280 int ret; 281 int status; 282 struct omap_hsmmc_host *host = mmc_priv(mmc); 283 284 if (mmc->supply.vqmmc && host->vqmmc_enabled) { 285 ret = regulator_disable(mmc->supply.vqmmc); 286 if (ret) { 287 dev_err(mmc_dev(mmc), "vmmc_aux reg disable failed\n"); 288 return ret; 289 } 290 host->vqmmc_enabled = 0; 291 } 292 293 if (mmc->supply.vmmc) { 294 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); 295 if (ret) 296 goto err_set_ocr; 297 } 298 299 return 0; 300 301 err_set_ocr: 302 if (mmc->supply.vqmmc) { 303 status = regulator_enable(mmc->supply.vqmmc); 304 if (status) 305 dev_err(mmc_dev(mmc), "vmmc_aux re-enable failed\n"); 306 } 307 308 return ret; 309 } 310 311 static int omap_hsmmc_set_pbias(struct omap_hsmmc_host *host, bool power_on, 312 int vdd) 313 { 314 int ret; 315 316 if (!host->pbias) 317 return 0; 318 319 if (power_on) { 320 if (vdd <= VDD_165_195) 321 ret = regulator_set_voltage(host->pbias, VDD_1V8, 322 VDD_1V8); 323 else 324 ret = regulator_set_voltage(host->pbias, VDD_3V0, 325 VDD_3V0); 326 if (ret < 0) { 327 dev_err(host->dev, "pbias set voltage fail\n"); 328 return ret; 329 } 330 331 if (host->pbias_enabled == 0) { 332 ret = regulator_enable(host->pbias); 333 if (ret) { 334 dev_err(host->dev, "pbias reg enable fail\n"); 335 return ret; 336 } 337 host->pbias_enabled = 1; 338 } 339 } else { 340 if (host->pbias_enabled == 1) { 341 ret = regulator_disable(host->pbias); 342 if (ret) { 343 dev_err(host->dev, "pbias reg disable fail\n"); 344 return ret; 345 } 346 host->pbias_enabled = 0; 347 } 348 } 349 350 return 0; 351 } 352 353 static int omap_hsmmc_set_power(struct omap_hsmmc_host *host, int power_on, 354 int vdd) 355 { 356 struct mmc_host *mmc = host->mmc; 357 int ret = 0; 358 359 if (mmc_pdata(host)->set_power) 360 return mmc_pdata(host)->set_power(host->dev, power_on, vdd); 361 362 /* 363 * If we don't see a Vcc regulator, assume it's a fixed 364 * voltage always-on regulator. 365 */ 366 if (!mmc->supply.vmmc) 367 return 0; 368 369 if (mmc_pdata(host)->before_set_reg) 370 mmc_pdata(host)->before_set_reg(host->dev, power_on, vdd); 371 372 ret = omap_hsmmc_set_pbias(host, false, 0); 373 if (ret) 374 return ret; 375 376 /* 377 * Assume Vcc regulator is used only to power the card ... OMAP 378 * VDDS is used to power the pins, optionally with a transceiver to 379 * support cards using voltages other than VDDS (1.8V nominal). When a 380 * transceiver is used, DAT3..7 are muxed as transceiver control pins. 381 * 382 * In some cases this regulator won't support enable/disable; 383 * e.g. it's a fixed rail for a WLAN chip. 384 * 385 * In other cases vcc_aux switches interface power. Example, for 386 * eMMC cards it represents VccQ. Sometimes transceivers or SDIO 387 * chips/cards need an interface voltage rail too. 388 */ 389 if (power_on) { 390 ret = omap_hsmmc_enable_supply(mmc); 391 if (ret) 392 return ret; 393 394 ret = omap_hsmmc_set_pbias(host, true, vdd); 395 if (ret) 396 goto err_set_voltage; 397 } else { 398 ret = omap_hsmmc_disable_supply(mmc); 399 if (ret) 400 return ret; 401 } 402 403 if (mmc_pdata(host)->after_set_reg) 404 mmc_pdata(host)->after_set_reg(host->dev, power_on, vdd); 405 406 return 0; 407 408 err_set_voltage: 409 omap_hsmmc_disable_supply(mmc); 410 411 return ret; 412 } 413 414 static int omap_hsmmc_disable_boot_regulator(struct regulator *reg) 415 { 416 int ret; 417 418 if (!reg) 419 return 0; 420 421 if (regulator_is_enabled(reg)) { 422 ret = regulator_enable(reg); 423 if (ret) 424 return ret; 425 426 ret = regulator_disable(reg); 427 if (ret) 428 return ret; 429 } 430 431 return 0; 432 } 433 434 static int omap_hsmmc_disable_boot_regulators(struct omap_hsmmc_host *host) 435 { 436 struct mmc_host *mmc = host->mmc; 437 int ret; 438 439 /* 440 * disable regulators enabled during boot and get the usecount 441 * right so that regulators can be enabled/disabled by checking 442 * the return value of regulator_is_enabled 443 */ 444 ret = omap_hsmmc_disable_boot_regulator(mmc->supply.vmmc); 445 if (ret) { 446 dev_err(host->dev, "fail to disable boot enabled vmmc reg\n"); 447 return ret; 448 } 449 450 ret = omap_hsmmc_disable_boot_regulator(mmc->supply.vqmmc); 451 if (ret) { 452 dev_err(host->dev, 453 "fail to disable boot enabled vmmc_aux reg\n"); 454 return ret; 455 } 456 457 ret = omap_hsmmc_disable_boot_regulator(host->pbias); 458 if (ret) { 459 dev_err(host->dev, 460 "failed to disable boot enabled pbias reg\n"); 461 return ret; 462 } 463 464 return 0; 465 } 466 467 static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host) 468 { 469 int ocr_value = 0; 470 int ret; 471 struct mmc_host *mmc = host->mmc; 472 473 if (mmc_pdata(host)->set_power) 474 return 0; 475 476 mmc->supply.vmmc = devm_regulator_get_optional(host->dev, "vmmc"); 477 if (IS_ERR(mmc->supply.vmmc)) { 478 ret = PTR_ERR(mmc->supply.vmmc); 479 if ((ret != -ENODEV) && host->dev->of_node) 480 return ret; 481 dev_dbg(host->dev, "unable to get vmmc regulator %ld\n", 482 PTR_ERR(mmc->supply.vmmc)); 483 mmc->supply.vmmc = NULL; 484 } else { 485 ocr_value = mmc_regulator_get_ocrmask(mmc->supply.vmmc); 486 if (ocr_value > 0) 487 mmc_pdata(host)->ocr_mask = ocr_value; 488 } 489 490 /* Allow an aux regulator */ 491 mmc->supply.vqmmc = devm_regulator_get_optional(host->dev, "vmmc_aux"); 492 if (IS_ERR(mmc->supply.vqmmc)) { 493 ret = PTR_ERR(mmc->supply.vqmmc); 494 if ((ret != -ENODEV) && host->dev->of_node) 495 return ret; 496 dev_dbg(host->dev, "unable to get vmmc_aux regulator %ld\n", 497 PTR_ERR(mmc->supply.vqmmc)); 498 mmc->supply.vqmmc = NULL; 499 } 500 501 host->pbias = devm_regulator_get_optional(host->dev, "pbias"); 502 if (IS_ERR(host->pbias)) { 503 ret = PTR_ERR(host->pbias); 504 if ((ret != -ENODEV) && host->dev->of_node) { 505 dev_err(host->dev, 506 "SD card detect fail? enable CONFIG_REGULATOR_PBIAS\n"); 507 return ret; 508 } 509 dev_dbg(host->dev, "unable to get pbias regulator %ld\n", 510 PTR_ERR(host->pbias)); 511 host->pbias = NULL; 512 } 513 514 /* For eMMC do not power off when not in sleep state */ 515 if (mmc_pdata(host)->no_regulator_off_init) 516 return 0; 517 518 ret = omap_hsmmc_disable_boot_regulators(host); 519 if (ret) 520 return ret; 521 522 return 0; 523 } 524 525 static irqreturn_t omap_hsmmc_cover_irq(int irq, void *dev_id); 526 527 static int omap_hsmmc_gpio_init(struct mmc_host *mmc, 528 struct omap_hsmmc_host *host, 529 struct omap_hsmmc_platform_data *pdata) 530 { 531 int ret; 532 533 if (gpio_is_valid(pdata->gpio_cod)) { 534 ret = mmc_gpio_request_cd(mmc, pdata->gpio_cod, 0); 535 if (ret) 536 return ret; 537 538 host->get_cover_state = omap_hsmmc_get_cover_state; 539 mmc_gpio_set_cd_isr(mmc, omap_hsmmc_cover_irq); 540 } else if (gpio_is_valid(pdata->gpio_cd)) { 541 ret = mmc_gpio_request_cd(mmc, pdata->gpio_cd, 0); 542 if (ret) 543 return ret; 544 545 host->card_detect = omap_hsmmc_card_detect; 546 } 547 548 if (gpio_is_valid(pdata->gpio_wp)) { 549 ret = mmc_gpio_request_ro(mmc, pdata->gpio_wp); 550 if (ret) 551 return ret; 552 } 553 554 return 0; 555 } 556 557 /* 558 * Start clock to the card 559 */ 560 static void omap_hsmmc_start_clock(struct omap_hsmmc_host *host) 561 { 562 OMAP_HSMMC_WRITE(host->base, SYSCTL, 563 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN); 564 } 565 566 /* 567 * Stop clock to the card 568 */ 569 static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host) 570 { 571 OMAP_HSMMC_WRITE(host->base, SYSCTL, 572 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN); 573 if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0) 574 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stopped\n"); 575 } 576 577 static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host, 578 struct mmc_command *cmd) 579 { 580 u32 irq_mask = INT_EN_MASK; 581 unsigned long flags; 582 583 if (host->use_dma) 584 irq_mask &= ~(BRR_EN | BWR_EN); 585 586 /* Disable timeout for erases */ 587 if (cmd->opcode == MMC_ERASE) 588 irq_mask &= ~DTO_EN; 589 590 spin_lock_irqsave(&host->irq_lock, flags); 591 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); 592 OMAP_HSMMC_WRITE(host->base, ISE, irq_mask); 593 594 /* latch pending CIRQ, but don't signal MMC core */ 595 if (host->flags & HSMMC_SDIO_IRQ_ENABLED) 596 irq_mask |= CIRQ_EN; 597 OMAP_HSMMC_WRITE(host->base, IE, irq_mask); 598 spin_unlock_irqrestore(&host->irq_lock, flags); 599 } 600 601 static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host) 602 { 603 u32 irq_mask = 0; 604 unsigned long flags; 605 606 spin_lock_irqsave(&host->irq_lock, flags); 607 /* no transfer running but need to keep cirq if enabled */ 608 if (host->flags & HSMMC_SDIO_IRQ_ENABLED) 609 irq_mask |= CIRQ_EN; 610 OMAP_HSMMC_WRITE(host->base, ISE, irq_mask); 611 OMAP_HSMMC_WRITE(host->base, IE, irq_mask); 612 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); 613 spin_unlock_irqrestore(&host->irq_lock, flags); 614 } 615 616 /* Calculate divisor for the given clock frequency */ 617 static u16 calc_divisor(struct omap_hsmmc_host *host, struct mmc_ios *ios) 618 { 619 u16 dsor = 0; 620 621 if (ios->clock) { 622 dsor = DIV_ROUND_UP(clk_get_rate(host->fclk), ios->clock); 623 if (dsor > CLKD_MAX) 624 dsor = CLKD_MAX; 625 } 626 627 return dsor; 628 } 629 630 static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host) 631 { 632 struct mmc_ios *ios = &host->mmc->ios; 633 unsigned long regval; 634 unsigned long timeout; 635 unsigned long clkdiv; 636 637 dev_vdbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock); 638 639 omap_hsmmc_stop_clock(host); 640 641 regval = OMAP_HSMMC_READ(host->base, SYSCTL); 642 regval = regval & ~(CLKD_MASK | DTO_MASK); 643 clkdiv = calc_divisor(host, ios); 644 regval = regval | (clkdiv << 6) | (DTO << 16); 645 OMAP_HSMMC_WRITE(host->base, SYSCTL, regval); 646 OMAP_HSMMC_WRITE(host->base, SYSCTL, 647 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE); 648 649 /* Wait till the ICS bit is set */ 650 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS); 651 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS 652 && time_before(jiffies, timeout)) 653 cpu_relax(); 654 655 /* 656 * Enable High-Speed Support 657 * Pre-Requisites 658 * - Controller should support High-Speed-Enable Bit 659 * - Controller should not be using DDR Mode 660 * - Controller should advertise that it supports High Speed 661 * in capabilities register 662 * - MMC/SD clock coming out of controller > 25MHz 663 */ 664 if ((mmc_pdata(host)->features & HSMMC_HAS_HSPE_SUPPORT) && 665 (ios->timing != MMC_TIMING_MMC_DDR52) && 666 (ios->timing != MMC_TIMING_UHS_DDR50) && 667 ((OMAP_HSMMC_READ(host->base, CAPA) & HSS) == HSS)) { 668 regval = OMAP_HSMMC_READ(host->base, HCTL); 669 if (clkdiv && (clk_get_rate(host->fclk)/clkdiv) > 25000000) 670 regval |= HSPE; 671 else 672 regval &= ~HSPE; 673 674 OMAP_HSMMC_WRITE(host->base, HCTL, regval); 675 } 676 677 omap_hsmmc_start_clock(host); 678 } 679 680 static void omap_hsmmc_set_bus_width(struct omap_hsmmc_host *host) 681 { 682 struct mmc_ios *ios = &host->mmc->ios; 683 u32 con; 684 685 con = OMAP_HSMMC_READ(host->base, CON); 686 if (ios->timing == MMC_TIMING_MMC_DDR52 || 687 ios->timing == MMC_TIMING_UHS_DDR50) 688 con |= DDR; /* configure in DDR mode */ 689 else 690 con &= ~DDR; 691 switch (ios->bus_width) { 692 case MMC_BUS_WIDTH_8: 693 OMAP_HSMMC_WRITE(host->base, CON, con | DW8); 694 break; 695 case MMC_BUS_WIDTH_4: 696 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8); 697 OMAP_HSMMC_WRITE(host->base, HCTL, 698 OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT); 699 break; 700 case MMC_BUS_WIDTH_1: 701 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8); 702 OMAP_HSMMC_WRITE(host->base, HCTL, 703 OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT); 704 break; 705 } 706 } 707 708 static void omap_hsmmc_set_bus_mode(struct omap_hsmmc_host *host) 709 { 710 struct mmc_ios *ios = &host->mmc->ios; 711 u32 con; 712 713 con = OMAP_HSMMC_READ(host->base, CON); 714 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) 715 OMAP_HSMMC_WRITE(host->base, CON, con | OD); 716 else 717 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD); 718 } 719 720 #ifdef CONFIG_PM 721 722 /* 723 * Restore the MMC host context, if it was lost as result of a 724 * power state change. 725 */ 726 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host) 727 { 728 struct mmc_ios *ios = &host->mmc->ios; 729 u32 hctl, capa; 730 unsigned long timeout; 731 732 if (host->con == OMAP_HSMMC_READ(host->base, CON) && 733 host->hctl == OMAP_HSMMC_READ(host->base, HCTL) && 734 host->sysctl == OMAP_HSMMC_READ(host->base, SYSCTL) && 735 host->capa == OMAP_HSMMC_READ(host->base, CAPA)) 736 return 0; 737 738 host->context_loss++; 739 740 if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) { 741 if (host->power_mode != MMC_POWER_OFF && 742 (1 << ios->vdd) <= MMC_VDD_23_24) 743 hctl = SDVS18; 744 else 745 hctl = SDVS30; 746 capa = VS30 | VS18; 747 } else { 748 hctl = SDVS18; 749 capa = VS18; 750 } 751 752 if (host->mmc->caps & MMC_CAP_SDIO_IRQ) 753 hctl |= IWE; 754 755 OMAP_HSMMC_WRITE(host->base, HCTL, 756 OMAP_HSMMC_READ(host->base, HCTL) | hctl); 757 758 OMAP_HSMMC_WRITE(host->base, CAPA, 759 OMAP_HSMMC_READ(host->base, CAPA) | capa); 760 761 OMAP_HSMMC_WRITE(host->base, HCTL, 762 OMAP_HSMMC_READ(host->base, HCTL) | SDBP); 763 764 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS); 765 while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP 766 && time_before(jiffies, timeout)) 767 ; 768 769 OMAP_HSMMC_WRITE(host->base, ISE, 0); 770 OMAP_HSMMC_WRITE(host->base, IE, 0); 771 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); 772 773 /* Do not initialize card-specific things if the power is off */ 774 if (host->power_mode == MMC_POWER_OFF) 775 goto out; 776 777 omap_hsmmc_set_bus_width(host); 778 779 omap_hsmmc_set_clock(host); 780 781 omap_hsmmc_set_bus_mode(host); 782 783 out: 784 dev_dbg(mmc_dev(host->mmc), "context is restored: restore count %d\n", 785 host->context_loss); 786 return 0; 787 } 788 789 /* 790 * Save the MMC host context (store the number of power state changes so far). 791 */ 792 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host) 793 { 794 host->con = OMAP_HSMMC_READ(host->base, CON); 795 host->hctl = OMAP_HSMMC_READ(host->base, HCTL); 796 host->sysctl = OMAP_HSMMC_READ(host->base, SYSCTL); 797 host->capa = OMAP_HSMMC_READ(host->base, CAPA); 798 } 799 800 #else 801 802 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host) 803 { 804 return 0; 805 } 806 807 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host) 808 { 809 } 810 811 #endif 812 813 /* 814 * Send init stream sequence to card 815 * before sending IDLE command 816 */ 817 static void send_init_stream(struct omap_hsmmc_host *host) 818 { 819 int reg = 0; 820 unsigned long timeout; 821 822 if (host->protect_card) 823 return; 824 825 disable_irq(host->irq); 826 827 OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK); 828 OMAP_HSMMC_WRITE(host->base, CON, 829 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM); 830 OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD); 831 832 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS); 833 while ((reg != CC_EN) && time_before(jiffies, timeout)) 834 reg = OMAP_HSMMC_READ(host->base, STAT) & CC_EN; 835 836 OMAP_HSMMC_WRITE(host->base, CON, 837 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM); 838 839 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); 840 OMAP_HSMMC_READ(host->base, STAT); 841 842 enable_irq(host->irq); 843 } 844 845 static inline 846 int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host) 847 { 848 int r = 1; 849 850 if (host->get_cover_state) 851 r = host->get_cover_state(host->dev); 852 return r; 853 } 854 855 static ssize_t 856 omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr, 857 char *buf) 858 { 859 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev); 860 struct omap_hsmmc_host *host = mmc_priv(mmc); 861 862 return sprintf(buf, "%s\n", 863 omap_hsmmc_cover_is_closed(host) ? "closed" : "open"); 864 } 865 866 static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL); 867 868 static ssize_t 869 omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr, 870 char *buf) 871 { 872 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev); 873 struct omap_hsmmc_host *host = mmc_priv(mmc); 874 875 return sprintf(buf, "%s\n", mmc_pdata(host)->name); 876 } 877 878 static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL); 879 880 /* 881 * Configure the response type and send the cmd. 882 */ 883 static void 884 omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd, 885 struct mmc_data *data) 886 { 887 int cmdreg = 0, resptype = 0, cmdtype = 0; 888 889 dev_vdbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n", 890 mmc_hostname(host->mmc), cmd->opcode, cmd->arg); 891 host->cmd = cmd; 892 893 omap_hsmmc_enable_irq(host, cmd); 894 895 host->response_busy = 0; 896 if (cmd->flags & MMC_RSP_PRESENT) { 897 if (cmd->flags & MMC_RSP_136) 898 resptype = 1; 899 else if (cmd->flags & MMC_RSP_BUSY) { 900 resptype = 3; 901 host->response_busy = 1; 902 } else 903 resptype = 2; 904 } 905 906 /* 907 * Unlike OMAP1 controller, the cmdtype does not seem to be based on 908 * ac, bc, adtc, bcr. Only commands ending an open ended transfer need 909 * a val of 0x3, rest 0x0. 910 */ 911 if (cmd == host->mrq->stop) 912 cmdtype = 0x3; 913 914 cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22); 915 916 if ((host->flags & AUTO_CMD23) && mmc_op_multi(cmd->opcode) && 917 host->mrq->sbc) { 918 cmdreg |= ACEN_ACMD23; 919 OMAP_HSMMC_WRITE(host->base, SDMASA, host->mrq->sbc->arg); 920 } 921 if (data) { 922 cmdreg |= DP_SELECT | MSBS | BCE; 923 if (data->flags & MMC_DATA_READ) 924 cmdreg |= DDIR; 925 else 926 cmdreg &= ~(DDIR); 927 } 928 929 if (host->use_dma) 930 cmdreg |= DMAE; 931 932 host->req_in_progress = 1; 933 934 OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg); 935 OMAP_HSMMC_WRITE(host->base, CMD, cmdreg); 936 } 937 938 static int 939 omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data) 940 { 941 if (data->flags & MMC_DATA_WRITE) 942 return DMA_TO_DEVICE; 943 else 944 return DMA_FROM_DEVICE; 945 } 946 947 static struct dma_chan *omap_hsmmc_get_dma_chan(struct omap_hsmmc_host *host, 948 struct mmc_data *data) 949 { 950 return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan; 951 } 952 953 static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq) 954 { 955 int dma_ch; 956 unsigned long flags; 957 958 spin_lock_irqsave(&host->irq_lock, flags); 959 host->req_in_progress = 0; 960 dma_ch = host->dma_ch; 961 spin_unlock_irqrestore(&host->irq_lock, flags); 962 963 omap_hsmmc_disable_irq(host); 964 /* Do not complete the request if DMA is still in progress */ 965 if (mrq->data && host->use_dma && dma_ch != -1) 966 return; 967 host->mrq = NULL; 968 mmc_request_done(host->mmc, mrq); 969 } 970 971 /* 972 * Notify the transfer complete to MMC core 973 */ 974 static void 975 omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data) 976 { 977 if (!data) { 978 struct mmc_request *mrq = host->mrq; 979 980 /* TC before CC from CMD6 - don't know why, but it happens */ 981 if (host->cmd && host->cmd->opcode == 6 && 982 host->response_busy) { 983 host->response_busy = 0; 984 return; 985 } 986 987 omap_hsmmc_request_done(host, mrq); 988 return; 989 } 990 991 host->data = NULL; 992 993 if (!data->error) 994 data->bytes_xfered += data->blocks * (data->blksz); 995 else 996 data->bytes_xfered = 0; 997 998 if (data->stop && (data->error || !host->mrq->sbc)) 999 omap_hsmmc_start_command(host, data->stop, NULL); 1000 else 1001 omap_hsmmc_request_done(host, data->mrq); 1002 } 1003 1004 /* 1005 * Notify the core about command completion 1006 */ 1007 static void 1008 omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd) 1009 { 1010 if (host->mrq->sbc && (host->cmd == host->mrq->sbc) && 1011 !host->mrq->sbc->error && !(host->flags & AUTO_CMD23)) { 1012 host->cmd = NULL; 1013 omap_hsmmc_start_dma_transfer(host); 1014 omap_hsmmc_start_command(host, host->mrq->cmd, 1015 host->mrq->data); 1016 return; 1017 } 1018 1019 host->cmd = NULL; 1020 1021 if (cmd->flags & MMC_RSP_PRESENT) { 1022 if (cmd->flags & MMC_RSP_136) { 1023 /* response type 2 */ 1024 cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10); 1025 cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32); 1026 cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54); 1027 cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76); 1028 } else { 1029 /* response types 1, 1b, 3, 4, 5, 6 */ 1030 cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10); 1031 } 1032 } 1033 if ((host->data == NULL && !host->response_busy) || cmd->error) 1034 omap_hsmmc_request_done(host, host->mrq); 1035 } 1036 1037 /* 1038 * DMA clean up for command errors 1039 */ 1040 static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno) 1041 { 1042 int dma_ch; 1043 unsigned long flags; 1044 1045 host->data->error = errno; 1046 1047 spin_lock_irqsave(&host->irq_lock, flags); 1048 dma_ch = host->dma_ch; 1049 host->dma_ch = -1; 1050 spin_unlock_irqrestore(&host->irq_lock, flags); 1051 1052 if (host->use_dma && dma_ch != -1) { 1053 struct dma_chan *chan = omap_hsmmc_get_dma_chan(host, host->data); 1054 1055 dmaengine_terminate_all(chan); 1056 dma_unmap_sg(chan->device->dev, 1057 host->data->sg, host->data->sg_len, 1058 omap_hsmmc_get_dma_dir(host, host->data)); 1059 1060 host->data->host_cookie = 0; 1061 } 1062 host->data = NULL; 1063 } 1064 1065 /* 1066 * Readable error output 1067 */ 1068 #ifdef CONFIG_MMC_DEBUG 1069 static void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host, u32 status) 1070 { 1071 /* --- means reserved bit without definition at documentation */ 1072 static const char *omap_hsmmc_status_bits[] = { 1073 "CC" , "TC" , "BGE", "---", "BWR" , "BRR" , "---" , "---" , 1074 "CIRQ", "OBI" , "---", "---", "---" , "---" , "---" , "ERRI", 1075 "CTO" , "CCRC", "CEB", "CIE", "DTO" , "DCRC", "DEB" , "---" , 1076 "ACE" , "---" , "---", "---", "CERR", "BADA", "---" , "---" 1077 }; 1078 char res[256]; 1079 char *buf = res; 1080 int len, i; 1081 1082 len = sprintf(buf, "MMC IRQ 0x%x :", status); 1083 buf += len; 1084 1085 for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++) 1086 if (status & (1 << i)) { 1087 len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]); 1088 buf += len; 1089 } 1090 1091 dev_vdbg(mmc_dev(host->mmc), "%s\n", res); 1092 } 1093 #else 1094 static inline void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host, 1095 u32 status) 1096 { 1097 } 1098 #endif /* CONFIG_MMC_DEBUG */ 1099 1100 /* 1101 * MMC controller internal state machines reset 1102 * 1103 * Used to reset command or data internal state machines, using respectively 1104 * SRC or SRD bit of SYSCTL register 1105 * Can be called from interrupt context 1106 */ 1107 static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host, 1108 unsigned long bit) 1109 { 1110 unsigned long i = 0; 1111 unsigned long limit = MMC_TIMEOUT_US; 1112 1113 OMAP_HSMMC_WRITE(host->base, SYSCTL, 1114 OMAP_HSMMC_READ(host->base, SYSCTL) | bit); 1115 1116 /* 1117 * OMAP4 ES2 and greater has an updated reset logic. 1118 * Monitor a 0->1 transition first 1119 */ 1120 if (mmc_pdata(host)->features & HSMMC_HAS_UPDATED_RESET) { 1121 while ((!(OMAP_HSMMC_READ(host->base, SYSCTL) & bit)) 1122 && (i++ < limit)) 1123 udelay(1); 1124 } 1125 i = 0; 1126 1127 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) && 1128 (i++ < limit)) 1129 udelay(1); 1130 1131 if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit) 1132 dev_err(mmc_dev(host->mmc), 1133 "Timeout waiting on controller reset in %s\n", 1134 __func__); 1135 } 1136 1137 static void hsmmc_command_incomplete(struct omap_hsmmc_host *host, 1138 int err, int end_cmd) 1139 { 1140 if (end_cmd) { 1141 omap_hsmmc_reset_controller_fsm(host, SRC); 1142 if (host->cmd) 1143 host->cmd->error = err; 1144 } 1145 1146 if (host->data) { 1147 omap_hsmmc_reset_controller_fsm(host, SRD); 1148 omap_hsmmc_dma_cleanup(host, err); 1149 } else if (host->mrq && host->mrq->cmd) 1150 host->mrq->cmd->error = err; 1151 } 1152 1153 static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status) 1154 { 1155 struct mmc_data *data; 1156 int end_cmd = 0, end_trans = 0; 1157 int error = 0; 1158 1159 data = host->data; 1160 dev_vdbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status); 1161 1162 if (status & ERR_EN) { 1163 omap_hsmmc_dbg_report_irq(host, status); 1164 1165 if (status & (CTO_EN | CCRC_EN)) 1166 end_cmd = 1; 1167 if (host->data || host->response_busy) { 1168 end_trans = !end_cmd; 1169 host->response_busy = 0; 1170 } 1171 if (status & (CTO_EN | DTO_EN)) 1172 hsmmc_command_incomplete(host, -ETIMEDOUT, end_cmd); 1173 else if (status & (CCRC_EN | DCRC_EN | DEB_EN | CEB_EN | 1174 BADA_EN)) 1175 hsmmc_command_incomplete(host, -EILSEQ, end_cmd); 1176 1177 if (status & ACE_EN) { 1178 u32 ac12; 1179 ac12 = OMAP_HSMMC_READ(host->base, AC12); 1180 if (!(ac12 & ACNE) && host->mrq->sbc) { 1181 end_cmd = 1; 1182 if (ac12 & ACTO) 1183 error = -ETIMEDOUT; 1184 else if (ac12 & (ACCE | ACEB | ACIE)) 1185 error = -EILSEQ; 1186 host->mrq->sbc->error = error; 1187 hsmmc_command_incomplete(host, error, end_cmd); 1188 } 1189 dev_dbg(mmc_dev(host->mmc), "AC12 err: 0x%x\n", ac12); 1190 } 1191 } 1192 1193 OMAP_HSMMC_WRITE(host->base, STAT, status); 1194 if (end_cmd || ((status & CC_EN) && host->cmd)) 1195 omap_hsmmc_cmd_done(host, host->cmd); 1196 if ((end_trans || (status & TC_EN)) && host->mrq) 1197 omap_hsmmc_xfer_done(host, data); 1198 } 1199 1200 /* 1201 * MMC controller IRQ handler 1202 */ 1203 static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id) 1204 { 1205 struct omap_hsmmc_host *host = dev_id; 1206 int status; 1207 1208 status = OMAP_HSMMC_READ(host->base, STAT); 1209 while (status & (INT_EN_MASK | CIRQ_EN)) { 1210 if (host->req_in_progress) 1211 omap_hsmmc_do_irq(host, status); 1212 1213 if (status & CIRQ_EN) 1214 mmc_signal_sdio_irq(host->mmc); 1215 1216 /* Flush posted write */ 1217 status = OMAP_HSMMC_READ(host->base, STAT); 1218 } 1219 1220 return IRQ_HANDLED; 1221 } 1222 1223 static void set_sd_bus_power(struct omap_hsmmc_host *host) 1224 { 1225 unsigned long i; 1226 1227 OMAP_HSMMC_WRITE(host->base, HCTL, 1228 OMAP_HSMMC_READ(host->base, HCTL) | SDBP); 1229 for (i = 0; i < loops_per_jiffy; i++) { 1230 if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP) 1231 break; 1232 cpu_relax(); 1233 } 1234 } 1235 1236 /* 1237 * Switch MMC interface voltage ... only relevant for MMC1. 1238 * 1239 * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver. 1240 * The MMC2 transceiver controls are used instead of DAT4..DAT7. 1241 * Some chips, like eMMC ones, use internal transceivers. 1242 */ 1243 static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd) 1244 { 1245 u32 reg_val = 0; 1246 int ret; 1247 1248 /* Disable the clocks */ 1249 if (host->dbclk) 1250 clk_disable_unprepare(host->dbclk); 1251 1252 /* Turn the power off */ 1253 ret = omap_hsmmc_set_power(host, 0, 0); 1254 1255 /* Turn the power ON with given VDD 1.8 or 3.0v */ 1256 if (!ret) 1257 ret = omap_hsmmc_set_power(host, 1, vdd); 1258 if (host->dbclk) 1259 clk_prepare_enable(host->dbclk); 1260 1261 if (ret != 0) 1262 goto err; 1263 1264 OMAP_HSMMC_WRITE(host->base, HCTL, 1265 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR); 1266 reg_val = OMAP_HSMMC_READ(host->base, HCTL); 1267 1268 /* 1269 * If a MMC dual voltage card is detected, the set_ios fn calls 1270 * this fn with VDD bit set for 1.8V. Upon card removal from the 1271 * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF. 1272 * 1273 * Cope with a bit of slop in the range ... per data sheets: 1274 * - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max, 1275 * but recommended values are 1.71V to 1.89V 1276 * - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max, 1277 * but recommended values are 2.7V to 3.3V 1278 * 1279 * Board setup code shouldn't permit anything very out-of-range. 1280 * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the 1281 * middle range) but VSIM can't power DAT4..DAT7 at more than 3V. 1282 */ 1283 if ((1 << vdd) <= MMC_VDD_23_24) 1284 reg_val |= SDVS18; 1285 else 1286 reg_val |= SDVS30; 1287 1288 OMAP_HSMMC_WRITE(host->base, HCTL, reg_val); 1289 set_sd_bus_power(host); 1290 1291 return 0; 1292 err: 1293 dev_err(mmc_dev(host->mmc), "Unable to switch operating voltage\n"); 1294 return ret; 1295 } 1296 1297 /* Protect the card while the cover is open */ 1298 static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host) 1299 { 1300 if (!host->get_cover_state) 1301 return; 1302 1303 host->reqs_blocked = 0; 1304 if (host->get_cover_state(host->dev)) { 1305 if (host->protect_card) { 1306 dev_info(host->dev, "%s: cover is closed, " 1307 "card is now accessible\n", 1308 mmc_hostname(host->mmc)); 1309 host->protect_card = 0; 1310 } 1311 } else { 1312 if (!host->protect_card) { 1313 dev_info(host->dev, "%s: cover is open, " 1314 "card is now inaccessible\n", 1315 mmc_hostname(host->mmc)); 1316 host->protect_card = 1; 1317 } 1318 } 1319 } 1320 1321 /* 1322 * irq handler when (cell-phone) cover is mounted/removed 1323 */ 1324 static irqreturn_t omap_hsmmc_cover_irq(int irq, void *dev_id) 1325 { 1326 struct omap_hsmmc_host *host = dev_id; 1327 1328 sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch"); 1329 1330 omap_hsmmc_protect_card(host); 1331 mmc_detect_change(host->mmc, (HZ * 200) / 1000); 1332 return IRQ_HANDLED; 1333 } 1334 1335 static void omap_hsmmc_dma_callback(void *param) 1336 { 1337 struct omap_hsmmc_host *host = param; 1338 struct dma_chan *chan; 1339 struct mmc_data *data; 1340 int req_in_progress; 1341 1342 spin_lock_irq(&host->irq_lock); 1343 if (host->dma_ch < 0) { 1344 spin_unlock_irq(&host->irq_lock); 1345 return; 1346 } 1347 1348 data = host->mrq->data; 1349 chan = omap_hsmmc_get_dma_chan(host, data); 1350 if (!data->host_cookie) 1351 dma_unmap_sg(chan->device->dev, 1352 data->sg, data->sg_len, 1353 omap_hsmmc_get_dma_dir(host, data)); 1354 1355 req_in_progress = host->req_in_progress; 1356 host->dma_ch = -1; 1357 spin_unlock_irq(&host->irq_lock); 1358 1359 /* If DMA has finished after TC, complete the request */ 1360 if (!req_in_progress) { 1361 struct mmc_request *mrq = host->mrq; 1362 1363 host->mrq = NULL; 1364 mmc_request_done(host->mmc, mrq); 1365 } 1366 } 1367 1368 static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host, 1369 struct mmc_data *data, 1370 struct omap_hsmmc_next *next, 1371 struct dma_chan *chan) 1372 { 1373 int dma_len; 1374 1375 if (!next && data->host_cookie && 1376 data->host_cookie != host->next_data.cookie) { 1377 dev_warn(host->dev, "[%s] invalid cookie: data->host_cookie %d" 1378 " host->next_data.cookie %d\n", 1379 __func__, data->host_cookie, host->next_data.cookie); 1380 data->host_cookie = 0; 1381 } 1382 1383 /* Check if next job is already prepared */ 1384 if (next || data->host_cookie != host->next_data.cookie) { 1385 dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len, 1386 omap_hsmmc_get_dma_dir(host, data)); 1387 1388 } else { 1389 dma_len = host->next_data.dma_len; 1390 host->next_data.dma_len = 0; 1391 } 1392 1393 1394 if (dma_len == 0) 1395 return -EINVAL; 1396 1397 if (next) { 1398 next->dma_len = dma_len; 1399 data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie; 1400 } else 1401 host->dma_len = dma_len; 1402 1403 return 0; 1404 } 1405 1406 /* 1407 * Routine to configure and start DMA for the MMC card 1408 */ 1409 static int omap_hsmmc_setup_dma_transfer(struct omap_hsmmc_host *host, 1410 struct mmc_request *req) 1411 { 1412 struct dma_slave_config cfg; 1413 struct dma_async_tx_descriptor *tx; 1414 int ret = 0, i; 1415 struct mmc_data *data = req->data; 1416 struct dma_chan *chan; 1417 1418 /* Sanity check: all the SG entries must be aligned by block size. */ 1419 for (i = 0; i < data->sg_len; i++) { 1420 struct scatterlist *sgl; 1421 1422 sgl = data->sg + i; 1423 if (sgl->length % data->blksz) 1424 return -EINVAL; 1425 } 1426 if ((data->blksz % 4) != 0) 1427 /* REVISIT: The MMC buffer increments only when MSB is written. 1428 * Return error for blksz which is non multiple of four. 1429 */ 1430 return -EINVAL; 1431 1432 BUG_ON(host->dma_ch != -1); 1433 1434 chan = omap_hsmmc_get_dma_chan(host, data); 1435 1436 cfg.src_addr = host->mapbase + OMAP_HSMMC_DATA; 1437 cfg.dst_addr = host->mapbase + OMAP_HSMMC_DATA; 1438 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 1439 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 1440 cfg.src_maxburst = data->blksz / 4; 1441 cfg.dst_maxburst = data->blksz / 4; 1442 1443 ret = dmaengine_slave_config(chan, &cfg); 1444 if (ret) 1445 return ret; 1446 1447 ret = omap_hsmmc_pre_dma_transfer(host, data, NULL, chan); 1448 if (ret) 1449 return ret; 1450 1451 tx = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len, 1452 data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, 1453 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 1454 if (!tx) { 1455 dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n"); 1456 /* FIXME: cleanup */ 1457 return -1; 1458 } 1459 1460 tx->callback = omap_hsmmc_dma_callback; 1461 tx->callback_param = host; 1462 1463 /* Does not fail */ 1464 dmaengine_submit(tx); 1465 1466 host->dma_ch = 1; 1467 1468 return 0; 1469 } 1470 1471 static void set_data_timeout(struct omap_hsmmc_host *host, 1472 unsigned int timeout_ns, 1473 unsigned int timeout_clks) 1474 { 1475 unsigned int timeout, cycle_ns; 1476 uint32_t reg, clkd, dto = 0; 1477 1478 reg = OMAP_HSMMC_READ(host->base, SYSCTL); 1479 clkd = (reg & CLKD_MASK) >> CLKD_SHIFT; 1480 if (clkd == 0) 1481 clkd = 1; 1482 1483 cycle_ns = 1000000000 / (host->clk_rate / clkd); 1484 timeout = timeout_ns / cycle_ns; 1485 timeout += timeout_clks; 1486 if (timeout) { 1487 while ((timeout & 0x80000000) == 0) { 1488 dto += 1; 1489 timeout <<= 1; 1490 } 1491 dto = 31 - dto; 1492 timeout <<= 1; 1493 if (timeout && dto) 1494 dto += 1; 1495 if (dto >= 13) 1496 dto -= 13; 1497 else 1498 dto = 0; 1499 if (dto > 14) 1500 dto = 14; 1501 } 1502 1503 reg &= ~DTO_MASK; 1504 reg |= dto << DTO_SHIFT; 1505 OMAP_HSMMC_WRITE(host->base, SYSCTL, reg); 1506 } 1507 1508 static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host) 1509 { 1510 struct mmc_request *req = host->mrq; 1511 struct dma_chan *chan; 1512 1513 if (!req->data) 1514 return; 1515 OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz) 1516 | (req->data->blocks << 16)); 1517 set_data_timeout(host, req->data->timeout_ns, 1518 req->data->timeout_clks); 1519 chan = omap_hsmmc_get_dma_chan(host, req->data); 1520 dma_async_issue_pending(chan); 1521 } 1522 1523 /* 1524 * Configure block length for MMC/SD cards and initiate the transfer. 1525 */ 1526 static int 1527 omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req) 1528 { 1529 int ret; 1530 host->data = req->data; 1531 1532 if (req->data == NULL) { 1533 OMAP_HSMMC_WRITE(host->base, BLK, 0); 1534 /* 1535 * Set an arbitrary 100ms data timeout for commands with 1536 * busy signal. 1537 */ 1538 if (req->cmd->flags & MMC_RSP_BUSY) 1539 set_data_timeout(host, 100000000U, 0); 1540 return 0; 1541 } 1542 1543 if (host->use_dma) { 1544 ret = omap_hsmmc_setup_dma_transfer(host, req); 1545 if (ret != 0) { 1546 dev_err(mmc_dev(host->mmc), "MMC start dma failure\n"); 1547 return ret; 1548 } 1549 } 1550 return 0; 1551 } 1552 1553 static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq, 1554 int err) 1555 { 1556 struct omap_hsmmc_host *host = mmc_priv(mmc); 1557 struct mmc_data *data = mrq->data; 1558 1559 if (host->use_dma && data->host_cookie) { 1560 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, data); 1561 1562 dma_unmap_sg(c->device->dev, data->sg, data->sg_len, 1563 omap_hsmmc_get_dma_dir(host, data)); 1564 data->host_cookie = 0; 1565 } 1566 } 1567 1568 static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq, 1569 bool is_first_req) 1570 { 1571 struct omap_hsmmc_host *host = mmc_priv(mmc); 1572 1573 if (mrq->data->host_cookie) { 1574 mrq->data->host_cookie = 0; 1575 return ; 1576 } 1577 1578 if (host->use_dma) { 1579 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, mrq->data); 1580 1581 if (omap_hsmmc_pre_dma_transfer(host, mrq->data, 1582 &host->next_data, c)) 1583 mrq->data->host_cookie = 0; 1584 } 1585 } 1586 1587 /* 1588 * Request function. for read/write operation 1589 */ 1590 static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req) 1591 { 1592 struct omap_hsmmc_host *host = mmc_priv(mmc); 1593 int err; 1594 1595 BUG_ON(host->req_in_progress); 1596 BUG_ON(host->dma_ch != -1); 1597 if (host->protect_card) { 1598 if (host->reqs_blocked < 3) { 1599 /* 1600 * Ensure the controller is left in a consistent 1601 * state by resetting the command and data state 1602 * machines. 1603 */ 1604 omap_hsmmc_reset_controller_fsm(host, SRD); 1605 omap_hsmmc_reset_controller_fsm(host, SRC); 1606 host->reqs_blocked += 1; 1607 } 1608 req->cmd->error = -EBADF; 1609 if (req->data) 1610 req->data->error = -EBADF; 1611 req->cmd->retries = 0; 1612 mmc_request_done(mmc, req); 1613 return; 1614 } else if (host->reqs_blocked) 1615 host->reqs_blocked = 0; 1616 WARN_ON(host->mrq != NULL); 1617 host->mrq = req; 1618 host->clk_rate = clk_get_rate(host->fclk); 1619 err = omap_hsmmc_prepare_data(host, req); 1620 if (err) { 1621 req->cmd->error = err; 1622 if (req->data) 1623 req->data->error = err; 1624 host->mrq = NULL; 1625 mmc_request_done(mmc, req); 1626 return; 1627 } 1628 if (req->sbc && !(host->flags & AUTO_CMD23)) { 1629 omap_hsmmc_start_command(host, req->sbc, NULL); 1630 return; 1631 } 1632 1633 omap_hsmmc_start_dma_transfer(host); 1634 omap_hsmmc_start_command(host, req->cmd, req->data); 1635 } 1636 1637 /* Routine to configure clock values. Exposed API to core */ 1638 static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 1639 { 1640 struct omap_hsmmc_host *host = mmc_priv(mmc); 1641 int do_send_init_stream = 0; 1642 1643 if (ios->power_mode != host->power_mode) { 1644 switch (ios->power_mode) { 1645 case MMC_POWER_OFF: 1646 omap_hsmmc_set_power(host, 0, 0); 1647 break; 1648 case MMC_POWER_UP: 1649 omap_hsmmc_set_power(host, 1, ios->vdd); 1650 break; 1651 case MMC_POWER_ON: 1652 do_send_init_stream = 1; 1653 break; 1654 } 1655 host->power_mode = ios->power_mode; 1656 } 1657 1658 /* FIXME: set registers based only on changes to ios */ 1659 1660 omap_hsmmc_set_bus_width(host); 1661 1662 if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) { 1663 /* Only MMC1 can interface at 3V without some flavor 1664 * of external transceiver; but they all handle 1.8V. 1665 */ 1666 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) && 1667 (ios->vdd == DUAL_VOLT_OCR_BIT)) { 1668 /* 1669 * The mmc_select_voltage fn of the core does 1670 * not seem to set the power_mode to 1671 * MMC_POWER_UP upon recalculating the voltage. 1672 * vdd 1.8v. 1673 */ 1674 if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0) 1675 dev_dbg(mmc_dev(host->mmc), 1676 "Switch operation failed\n"); 1677 } 1678 } 1679 1680 omap_hsmmc_set_clock(host); 1681 1682 if (do_send_init_stream) 1683 send_init_stream(host); 1684 1685 omap_hsmmc_set_bus_mode(host); 1686 } 1687 1688 static int omap_hsmmc_get_cd(struct mmc_host *mmc) 1689 { 1690 struct omap_hsmmc_host *host = mmc_priv(mmc); 1691 1692 if (!host->card_detect) 1693 return -ENOSYS; 1694 return host->card_detect(host->dev); 1695 } 1696 1697 static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card) 1698 { 1699 struct omap_hsmmc_host *host = mmc_priv(mmc); 1700 1701 if (mmc_pdata(host)->init_card) 1702 mmc_pdata(host)->init_card(card); 1703 } 1704 1705 static void omap_hsmmc_enable_sdio_irq(struct mmc_host *mmc, int enable) 1706 { 1707 struct omap_hsmmc_host *host = mmc_priv(mmc); 1708 u32 irq_mask, con; 1709 unsigned long flags; 1710 1711 spin_lock_irqsave(&host->irq_lock, flags); 1712 1713 con = OMAP_HSMMC_READ(host->base, CON); 1714 irq_mask = OMAP_HSMMC_READ(host->base, ISE); 1715 if (enable) { 1716 host->flags |= HSMMC_SDIO_IRQ_ENABLED; 1717 irq_mask |= CIRQ_EN; 1718 con |= CTPL | CLKEXTFREE; 1719 } else { 1720 host->flags &= ~HSMMC_SDIO_IRQ_ENABLED; 1721 irq_mask &= ~CIRQ_EN; 1722 con &= ~(CTPL | CLKEXTFREE); 1723 } 1724 OMAP_HSMMC_WRITE(host->base, CON, con); 1725 OMAP_HSMMC_WRITE(host->base, IE, irq_mask); 1726 1727 /* 1728 * if enable, piggy back detection on current request 1729 * but always disable immediately 1730 */ 1731 if (!host->req_in_progress || !enable) 1732 OMAP_HSMMC_WRITE(host->base, ISE, irq_mask); 1733 1734 /* flush posted write */ 1735 OMAP_HSMMC_READ(host->base, IE); 1736 1737 spin_unlock_irqrestore(&host->irq_lock, flags); 1738 } 1739 1740 static int omap_hsmmc_configure_wake_irq(struct omap_hsmmc_host *host) 1741 { 1742 int ret; 1743 1744 /* 1745 * For omaps with wake-up path, wakeirq will be irq from pinctrl and 1746 * for other omaps, wakeirq will be from GPIO (dat line remuxed to 1747 * gpio). wakeirq is needed to detect sdio irq in runtime suspend state 1748 * with functional clock disabled. 1749 */ 1750 if (!host->dev->of_node || !host->wake_irq) 1751 return -ENODEV; 1752 1753 ret = dev_pm_set_dedicated_wake_irq(host->dev, host->wake_irq); 1754 if (ret) { 1755 dev_err(mmc_dev(host->mmc), "Unable to request wake IRQ\n"); 1756 goto err; 1757 } 1758 1759 /* 1760 * Some omaps don't have wake-up path from deeper idle states 1761 * and need to remux SDIO DAT1 to GPIO for wake-up from idle. 1762 */ 1763 if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING) { 1764 struct pinctrl *p = devm_pinctrl_get(host->dev); 1765 if (!p) { 1766 ret = -ENODEV; 1767 goto err_free_irq; 1768 } 1769 if (IS_ERR(pinctrl_lookup_state(p, PINCTRL_STATE_DEFAULT))) { 1770 dev_info(host->dev, "missing default pinctrl state\n"); 1771 devm_pinctrl_put(p); 1772 ret = -EINVAL; 1773 goto err_free_irq; 1774 } 1775 1776 if (IS_ERR(pinctrl_lookup_state(p, PINCTRL_STATE_IDLE))) { 1777 dev_info(host->dev, "missing idle pinctrl state\n"); 1778 devm_pinctrl_put(p); 1779 ret = -EINVAL; 1780 goto err_free_irq; 1781 } 1782 devm_pinctrl_put(p); 1783 } 1784 1785 OMAP_HSMMC_WRITE(host->base, HCTL, 1786 OMAP_HSMMC_READ(host->base, HCTL) | IWE); 1787 return 0; 1788 1789 err_free_irq: 1790 dev_pm_clear_wake_irq(host->dev); 1791 err: 1792 dev_warn(host->dev, "no SDIO IRQ support, falling back to polling\n"); 1793 host->wake_irq = 0; 1794 return ret; 1795 } 1796 1797 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host) 1798 { 1799 u32 hctl, capa, value; 1800 1801 /* Only MMC1 supports 3.0V */ 1802 if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) { 1803 hctl = SDVS30; 1804 capa = VS30 | VS18; 1805 } else { 1806 hctl = SDVS18; 1807 capa = VS18; 1808 } 1809 1810 value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK; 1811 OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl); 1812 1813 value = OMAP_HSMMC_READ(host->base, CAPA); 1814 OMAP_HSMMC_WRITE(host->base, CAPA, value | capa); 1815 1816 /* Set SD bus power bit */ 1817 set_sd_bus_power(host); 1818 } 1819 1820 static int omap_hsmmc_multi_io_quirk(struct mmc_card *card, 1821 unsigned int direction, int blk_size) 1822 { 1823 /* This controller can't do multiblock reads due to hw bugs */ 1824 if (direction == MMC_DATA_READ) 1825 return 1; 1826 1827 return blk_size; 1828 } 1829 1830 static struct mmc_host_ops omap_hsmmc_ops = { 1831 .post_req = omap_hsmmc_post_req, 1832 .pre_req = omap_hsmmc_pre_req, 1833 .request = omap_hsmmc_request, 1834 .set_ios = omap_hsmmc_set_ios, 1835 .get_cd = omap_hsmmc_get_cd, 1836 .get_ro = mmc_gpio_get_ro, 1837 .init_card = omap_hsmmc_init_card, 1838 .enable_sdio_irq = omap_hsmmc_enable_sdio_irq, 1839 }; 1840 1841 #ifdef CONFIG_DEBUG_FS 1842 1843 static int omap_hsmmc_regs_show(struct seq_file *s, void *data) 1844 { 1845 struct mmc_host *mmc = s->private; 1846 struct omap_hsmmc_host *host = mmc_priv(mmc); 1847 1848 seq_printf(s, "mmc%d:\n", mmc->index); 1849 seq_printf(s, "sdio irq mode\t%s\n", 1850 (mmc->caps & MMC_CAP_SDIO_IRQ) ? "interrupt" : "polling"); 1851 1852 if (mmc->caps & MMC_CAP_SDIO_IRQ) { 1853 seq_printf(s, "sdio irq \t%s\n", 1854 (host->flags & HSMMC_SDIO_IRQ_ENABLED) ? "enabled" 1855 : "disabled"); 1856 } 1857 seq_printf(s, "ctx_loss:\t%d\n", host->context_loss); 1858 1859 pm_runtime_get_sync(host->dev); 1860 seq_puts(s, "\nregs:\n"); 1861 seq_printf(s, "CON:\t\t0x%08x\n", 1862 OMAP_HSMMC_READ(host->base, CON)); 1863 seq_printf(s, "PSTATE:\t\t0x%08x\n", 1864 OMAP_HSMMC_READ(host->base, PSTATE)); 1865 seq_printf(s, "HCTL:\t\t0x%08x\n", 1866 OMAP_HSMMC_READ(host->base, HCTL)); 1867 seq_printf(s, "SYSCTL:\t\t0x%08x\n", 1868 OMAP_HSMMC_READ(host->base, SYSCTL)); 1869 seq_printf(s, "IE:\t\t0x%08x\n", 1870 OMAP_HSMMC_READ(host->base, IE)); 1871 seq_printf(s, "ISE:\t\t0x%08x\n", 1872 OMAP_HSMMC_READ(host->base, ISE)); 1873 seq_printf(s, "CAPA:\t\t0x%08x\n", 1874 OMAP_HSMMC_READ(host->base, CAPA)); 1875 1876 pm_runtime_mark_last_busy(host->dev); 1877 pm_runtime_put_autosuspend(host->dev); 1878 1879 return 0; 1880 } 1881 1882 static int omap_hsmmc_regs_open(struct inode *inode, struct file *file) 1883 { 1884 return single_open(file, omap_hsmmc_regs_show, inode->i_private); 1885 } 1886 1887 static const struct file_operations mmc_regs_fops = { 1888 .open = omap_hsmmc_regs_open, 1889 .read = seq_read, 1890 .llseek = seq_lseek, 1891 .release = single_release, 1892 }; 1893 1894 static void omap_hsmmc_debugfs(struct mmc_host *mmc) 1895 { 1896 if (mmc->debugfs_root) 1897 debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root, 1898 mmc, &mmc_regs_fops); 1899 } 1900 1901 #else 1902 1903 static void omap_hsmmc_debugfs(struct mmc_host *mmc) 1904 { 1905 } 1906 1907 #endif 1908 1909 #ifdef CONFIG_OF 1910 static const struct omap_mmc_of_data omap3_pre_es3_mmc_of_data = { 1911 /* See 35xx errata 2.1.1.128 in SPRZ278F */ 1912 .controller_flags = OMAP_HSMMC_BROKEN_MULTIBLOCK_READ, 1913 }; 1914 1915 static const struct omap_mmc_of_data omap4_mmc_of_data = { 1916 .reg_offset = 0x100, 1917 }; 1918 static const struct omap_mmc_of_data am33xx_mmc_of_data = { 1919 .reg_offset = 0x100, 1920 .controller_flags = OMAP_HSMMC_SWAKEUP_MISSING, 1921 }; 1922 1923 static const struct of_device_id omap_mmc_of_match[] = { 1924 { 1925 .compatible = "ti,omap2-hsmmc", 1926 }, 1927 { 1928 .compatible = "ti,omap3-pre-es3-hsmmc", 1929 .data = &omap3_pre_es3_mmc_of_data, 1930 }, 1931 { 1932 .compatible = "ti,omap3-hsmmc", 1933 }, 1934 { 1935 .compatible = "ti,omap4-hsmmc", 1936 .data = &omap4_mmc_of_data, 1937 }, 1938 { 1939 .compatible = "ti,am33xx-hsmmc", 1940 .data = &am33xx_mmc_of_data, 1941 }, 1942 {}, 1943 }; 1944 MODULE_DEVICE_TABLE(of, omap_mmc_of_match); 1945 1946 static struct omap_hsmmc_platform_data *of_get_hsmmc_pdata(struct device *dev) 1947 { 1948 struct omap_hsmmc_platform_data *pdata, *legacy; 1949 struct device_node *np = dev->of_node; 1950 1951 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 1952 if (!pdata) 1953 return ERR_PTR(-ENOMEM); /* out of memory */ 1954 1955 legacy = dev_get_platdata(dev); 1956 if (legacy && legacy->name) 1957 pdata->name = legacy->name; 1958 1959 if (of_find_property(np, "ti,dual-volt", NULL)) 1960 pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT; 1961 1962 pdata->gpio_cd = -EINVAL; 1963 pdata->gpio_cod = -EINVAL; 1964 pdata->gpio_wp = -EINVAL; 1965 1966 if (of_find_property(np, "ti,non-removable", NULL)) { 1967 pdata->nonremovable = true; 1968 pdata->no_regulator_off_init = true; 1969 } 1970 1971 if (of_find_property(np, "ti,needs-special-reset", NULL)) 1972 pdata->features |= HSMMC_HAS_UPDATED_RESET; 1973 1974 if (of_find_property(np, "ti,needs-special-hs-handling", NULL)) 1975 pdata->features |= HSMMC_HAS_HSPE_SUPPORT; 1976 1977 return pdata; 1978 } 1979 #else 1980 static inline struct omap_hsmmc_platform_data 1981 *of_get_hsmmc_pdata(struct device *dev) 1982 { 1983 return ERR_PTR(-EINVAL); 1984 } 1985 #endif 1986 1987 static int omap_hsmmc_probe(struct platform_device *pdev) 1988 { 1989 struct omap_hsmmc_platform_data *pdata = pdev->dev.platform_data; 1990 struct mmc_host *mmc; 1991 struct omap_hsmmc_host *host = NULL; 1992 struct resource *res; 1993 int ret, irq; 1994 const struct of_device_id *match; 1995 const struct omap_mmc_of_data *data; 1996 void __iomem *base; 1997 1998 match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev); 1999 if (match) { 2000 pdata = of_get_hsmmc_pdata(&pdev->dev); 2001 2002 if (IS_ERR(pdata)) 2003 return PTR_ERR(pdata); 2004 2005 if (match->data) { 2006 data = match->data; 2007 pdata->reg_offset = data->reg_offset; 2008 pdata->controller_flags |= data->controller_flags; 2009 } 2010 } 2011 2012 if (pdata == NULL) { 2013 dev_err(&pdev->dev, "Platform Data is missing\n"); 2014 return -ENXIO; 2015 } 2016 2017 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 2018 irq = platform_get_irq(pdev, 0); 2019 if (res == NULL || irq < 0) 2020 return -ENXIO; 2021 2022 base = devm_ioremap_resource(&pdev->dev, res); 2023 if (IS_ERR(base)) 2024 return PTR_ERR(base); 2025 2026 mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev); 2027 if (!mmc) { 2028 ret = -ENOMEM; 2029 goto err; 2030 } 2031 2032 ret = mmc_of_parse(mmc); 2033 if (ret) 2034 goto err1; 2035 2036 host = mmc_priv(mmc); 2037 host->mmc = mmc; 2038 host->pdata = pdata; 2039 host->dev = &pdev->dev; 2040 host->use_dma = 1; 2041 host->dma_ch = -1; 2042 host->irq = irq; 2043 host->mapbase = res->start + pdata->reg_offset; 2044 host->base = base + pdata->reg_offset; 2045 host->power_mode = MMC_POWER_OFF; 2046 host->next_data.cookie = 1; 2047 host->pbias_enabled = 0; 2048 host->vqmmc_enabled = 0; 2049 2050 ret = omap_hsmmc_gpio_init(mmc, host, pdata); 2051 if (ret) 2052 goto err_gpio; 2053 2054 platform_set_drvdata(pdev, host); 2055 2056 if (pdev->dev.of_node) 2057 host->wake_irq = irq_of_parse_and_map(pdev->dev.of_node, 1); 2058 2059 mmc->ops = &omap_hsmmc_ops; 2060 2061 mmc->f_min = OMAP_MMC_MIN_CLOCK; 2062 2063 if (pdata->max_freq > 0) 2064 mmc->f_max = pdata->max_freq; 2065 else if (mmc->f_max == 0) 2066 mmc->f_max = OMAP_MMC_MAX_CLOCK; 2067 2068 spin_lock_init(&host->irq_lock); 2069 2070 host->fclk = devm_clk_get(&pdev->dev, "fck"); 2071 if (IS_ERR(host->fclk)) { 2072 ret = PTR_ERR(host->fclk); 2073 host->fclk = NULL; 2074 goto err1; 2075 } 2076 2077 if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) { 2078 dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n"); 2079 omap_hsmmc_ops.multi_io_quirk = omap_hsmmc_multi_io_quirk; 2080 } 2081 2082 device_init_wakeup(&pdev->dev, true); 2083 pm_runtime_enable(host->dev); 2084 pm_runtime_get_sync(host->dev); 2085 pm_runtime_set_autosuspend_delay(host->dev, MMC_AUTOSUSPEND_DELAY); 2086 pm_runtime_use_autosuspend(host->dev); 2087 2088 omap_hsmmc_context_save(host); 2089 2090 host->dbclk = devm_clk_get(&pdev->dev, "mmchsdb_fck"); 2091 /* 2092 * MMC can still work without debounce clock. 2093 */ 2094 if (IS_ERR(host->dbclk)) { 2095 host->dbclk = NULL; 2096 } else if (clk_prepare_enable(host->dbclk) != 0) { 2097 dev_warn(mmc_dev(host->mmc), "Failed to enable debounce clk\n"); 2098 host->dbclk = NULL; 2099 } 2100 2101 /* Since we do only SG emulation, we can have as many segs 2102 * as we want. */ 2103 mmc->max_segs = 1024; 2104 2105 mmc->max_blk_size = 512; /* Block Length at max can be 1024 */ 2106 mmc->max_blk_count = 0xFFFF; /* No. of Blocks is 16 bits */ 2107 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; 2108 mmc->max_seg_size = mmc->max_req_size; 2109 2110 mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED | 2111 MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE; 2112 2113 mmc->caps |= mmc_pdata(host)->caps; 2114 if (mmc->caps & MMC_CAP_8_BIT_DATA) 2115 mmc->caps |= MMC_CAP_4_BIT_DATA; 2116 2117 if (mmc_pdata(host)->nonremovable) 2118 mmc->caps |= MMC_CAP_NONREMOVABLE; 2119 2120 mmc->pm_caps |= mmc_pdata(host)->pm_caps; 2121 2122 omap_hsmmc_conf_bus_power(host); 2123 2124 host->rx_chan = dma_request_chan(&pdev->dev, "rx"); 2125 if (IS_ERR(host->rx_chan)) { 2126 dev_err(mmc_dev(host->mmc), "RX DMA channel request failed\n"); 2127 ret = PTR_ERR(host->rx_chan); 2128 goto err_irq; 2129 } 2130 2131 host->tx_chan = dma_request_chan(&pdev->dev, "tx"); 2132 if (IS_ERR(host->tx_chan)) { 2133 dev_err(mmc_dev(host->mmc), "TX DMA channel request failed\n"); 2134 ret = PTR_ERR(host->tx_chan); 2135 goto err_irq; 2136 } 2137 2138 /* Request IRQ for MMC operations */ 2139 ret = devm_request_irq(&pdev->dev, host->irq, omap_hsmmc_irq, 0, 2140 mmc_hostname(mmc), host); 2141 if (ret) { 2142 dev_err(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n"); 2143 goto err_irq; 2144 } 2145 2146 ret = omap_hsmmc_reg_get(host); 2147 if (ret) 2148 goto err_irq; 2149 2150 mmc->ocr_avail = mmc_pdata(host)->ocr_mask; 2151 2152 omap_hsmmc_disable_irq(host); 2153 2154 /* 2155 * For now, only support SDIO interrupt if we have a separate 2156 * wake-up interrupt configured from device tree. This is because 2157 * the wake-up interrupt is needed for idle state and some 2158 * platforms need special quirks. And we don't want to add new 2159 * legacy mux platform init code callbacks any longer as we 2160 * are moving to DT based booting anyways. 2161 */ 2162 ret = omap_hsmmc_configure_wake_irq(host); 2163 if (!ret) 2164 mmc->caps |= MMC_CAP_SDIO_IRQ; 2165 2166 omap_hsmmc_protect_card(host); 2167 2168 mmc_add_host(mmc); 2169 2170 if (mmc_pdata(host)->name != NULL) { 2171 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name); 2172 if (ret < 0) 2173 goto err_slot_name; 2174 } 2175 if (host->get_cover_state) { 2176 ret = device_create_file(&mmc->class_dev, 2177 &dev_attr_cover_switch); 2178 if (ret < 0) 2179 goto err_slot_name; 2180 } 2181 2182 omap_hsmmc_debugfs(mmc); 2183 pm_runtime_mark_last_busy(host->dev); 2184 pm_runtime_put_autosuspend(host->dev); 2185 2186 return 0; 2187 2188 err_slot_name: 2189 mmc_remove_host(mmc); 2190 err_irq: 2191 device_init_wakeup(&pdev->dev, false); 2192 if (!IS_ERR_OR_NULL(host->tx_chan)) 2193 dma_release_channel(host->tx_chan); 2194 if (!IS_ERR_OR_NULL(host->rx_chan)) 2195 dma_release_channel(host->rx_chan); 2196 pm_runtime_dont_use_autosuspend(host->dev); 2197 pm_runtime_put_sync(host->dev); 2198 pm_runtime_disable(host->dev); 2199 if (host->dbclk) 2200 clk_disable_unprepare(host->dbclk); 2201 err1: 2202 err_gpio: 2203 mmc_free_host(mmc); 2204 err: 2205 return ret; 2206 } 2207 2208 static int omap_hsmmc_remove(struct platform_device *pdev) 2209 { 2210 struct omap_hsmmc_host *host = platform_get_drvdata(pdev); 2211 2212 pm_runtime_get_sync(host->dev); 2213 mmc_remove_host(host->mmc); 2214 2215 dma_release_channel(host->tx_chan); 2216 dma_release_channel(host->rx_chan); 2217 2218 pm_runtime_dont_use_autosuspend(host->dev); 2219 pm_runtime_put_sync(host->dev); 2220 pm_runtime_disable(host->dev); 2221 device_init_wakeup(&pdev->dev, false); 2222 if (host->dbclk) 2223 clk_disable_unprepare(host->dbclk); 2224 2225 mmc_free_host(host->mmc); 2226 2227 return 0; 2228 } 2229 2230 #ifdef CONFIG_PM_SLEEP 2231 static int omap_hsmmc_suspend(struct device *dev) 2232 { 2233 struct omap_hsmmc_host *host = dev_get_drvdata(dev); 2234 2235 if (!host) 2236 return 0; 2237 2238 pm_runtime_get_sync(host->dev); 2239 2240 if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER)) { 2241 OMAP_HSMMC_WRITE(host->base, ISE, 0); 2242 OMAP_HSMMC_WRITE(host->base, IE, 0); 2243 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); 2244 OMAP_HSMMC_WRITE(host->base, HCTL, 2245 OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP); 2246 } 2247 2248 if (host->dbclk) 2249 clk_disable_unprepare(host->dbclk); 2250 2251 pm_runtime_put_sync(host->dev); 2252 return 0; 2253 } 2254 2255 /* Routine to resume the MMC device */ 2256 static int omap_hsmmc_resume(struct device *dev) 2257 { 2258 struct omap_hsmmc_host *host = dev_get_drvdata(dev); 2259 2260 if (!host) 2261 return 0; 2262 2263 pm_runtime_get_sync(host->dev); 2264 2265 if (host->dbclk) 2266 clk_prepare_enable(host->dbclk); 2267 2268 if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER)) 2269 omap_hsmmc_conf_bus_power(host); 2270 2271 omap_hsmmc_protect_card(host); 2272 pm_runtime_mark_last_busy(host->dev); 2273 pm_runtime_put_autosuspend(host->dev); 2274 return 0; 2275 } 2276 #endif 2277 2278 static int omap_hsmmc_runtime_suspend(struct device *dev) 2279 { 2280 struct omap_hsmmc_host *host; 2281 unsigned long flags; 2282 int ret = 0; 2283 2284 host = platform_get_drvdata(to_platform_device(dev)); 2285 omap_hsmmc_context_save(host); 2286 dev_dbg(dev, "disabled\n"); 2287 2288 spin_lock_irqsave(&host->irq_lock, flags); 2289 if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) && 2290 (host->flags & HSMMC_SDIO_IRQ_ENABLED)) { 2291 /* disable sdio irq handling to prevent race */ 2292 OMAP_HSMMC_WRITE(host->base, ISE, 0); 2293 OMAP_HSMMC_WRITE(host->base, IE, 0); 2294 2295 if (!(OMAP_HSMMC_READ(host->base, PSTATE) & DLEV_DAT(1))) { 2296 /* 2297 * dat1 line low, pending sdio irq 2298 * race condition: possible irq handler running on 2299 * multi-core, abort 2300 */ 2301 dev_dbg(dev, "pending sdio irq, abort suspend\n"); 2302 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); 2303 OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN); 2304 OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN); 2305 pm_runtime_mark_last_busy(dev); 2306 ret = -EBUSY; 2307 goto abort; 2308 } 2309 2310 pinctrl_pm_select_idle_state(dev); 2311 } else { 2312 pinctrl_pm_select_idle_state(dev); 2313 } 2314 2315 abort: 2316 spin_unlock_irqrestore(&host->irq_lock, flags); 2317 return ret; 2318 } 2319 2320 static int omap_hsmmc_runtime_resume(struct device *dev) 2321 { 2322 struct omap_hsmmc_host *host; 2323 unsigned long flags; 2324 2325 host = platform_get_drvdata(to_platform_device(dev)); 2326 omap_hsmmc_context_restore(host); 2327 dev_dbg(dev, "enabled\n"); 2328 2329 spin_lock_irqsave(&host->irq_lock, flags); 2330 if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) && 2331 (host->flags & HSMMC_SDIO_IRQ_ENABLED)) { 2332 2333 pinctrl_pm_select_default_state(host->dev); 2334 2335 /* irq lost, if pinmux incorrect */ 2336 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); 2337 OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN); 2338 OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN); 2339 } else { 2340 pinctrl_pm_select_default_state(host->dev); 2341 } 2342 spin_unlock_irqrestore(&host->irq_lock, flags); 2343 return 0; 2344 } 2345 2346 static struct dev_pm_ops omap_hsmmc_dev_pm_ops = { 2347 SET_SYSTEM_SLEEP_PM_OPS(omap_hsmmc_suspend, omap_hsmmc_resume) 2348 .runtime_suspend = omap_hsmmc_runtime_suspend, 2349 .runtime_resume = omap_hsmmc_runtime_resume, 2350 }; 2351 2352 static struct platform_driver omap_hsmmc_driver = { 2353 .probe = omap_hsmmc_probe, 2354 .remove = omap_hsmmc_remove, 2355 .driver = { 2356 .name = DRIVER_NAME, 2357 .pm = &omap_hsmmc_dev_pm_ops, 2358 .of_match_table = of_match_ptr(omap_mmc_of_match), 2359 }, 2360 }; 2361 2362 module_platform_driver(omap_hsmmc_driver); 2363 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver"); 2364 MODULE_LICENSE("GPL"); 2365 MODULE_ALIAS("platform:" DRIVER_NAME); 2366 MODULE_AUTHOR("Texas Instruments Inc"); 2367