1 /* 2 * Copyright (C) 2010 Google, Inc. 3 * 4 * This software is licensed under the terms of the GNU General Public 5 * License version 2, as published by the Free Software Foundation, and 6 * may be copied, distributed, and modified under those terms. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 */ 14 15 #include <linux/delay.h> 16 #include <linux/err.h> 17 #include <linux/module.h> 18 #include <linux/init.h> 19 #include <linux/iopoll.h> 20 #include <linux/platform_device.h> 21 #include <linux/clk.h> 22 #include <linux/io.h> 23 #include <linux/of.h> 24 #include <linux/of_device.h> 25 #include <linux/pinctrl/consumer.h> 26 #include <linux/regulator/consumer.h> 27 #include <linux/reset.h> 28 #include <linux/mmc/card.h> 29 #include <linux/mmc/host.h> 30 #include <linux/mmc/mmc.h> 31 #include <linux/mmc/slot-gpio.h> 32 #include <linux/gpio/consumer.h> 33 #include <linux/ktime.h> 34 35 #include "sdhci-pltfm.h" 36 #include "cqhci.h" 37 38 /* Tegra SDHOST controller vendor register definitions */ 39 #define SDHCI_TEGRA_VENDOR_CLOCK_CTRL 0x100 40 #define SDHCI_CLOCK_CTRL_TAP_MASK 0x00ff0000 41 #define SDHCI_CLOCK_CTRL_TAP_SHIFT 16 42 #define SDHCI_CLOCK_CTRL_TRIM_MASK 0x1f000000 43 #define SDHCI_CLOCK_CTRL_TRIM_SHIFT 24 44 #define SDHCI_CLOCK_CTRL_SDR50_TUNING_OVERRIDE BIT(5) 45 #define SDHCI_CLOCK_CTRL_PADPIPE_CLKEN_OVERRIDE BIT(3) 46 #define SDHCI_CLOCK_CTRL_SPI_MODE_CLKEN_OVERRIDE BIT(2) 47 48 #define SDHCI_TEGRA_VENDOR_SYS_SW_CTRL 0x104 49 #define SDHCI_TEGRA_SYS_SW_CTRL_ENHANCED_STROBE BIT(31) 50 51 #define SDHCI_TEGRA_VENDOR_CAP_OVERRIDES 0x10c 52 #define SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_MASK 0x00003f00 53 #define SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_SHIFT 8 54 55 #define SDHCI_TEGRA_VENDOR_MISC_CTRL 0x120 56 #define SDHCI_MISC_CTRL_ENABLE_SDR104 0x8 57 #define SDHCI_MISC_CTRL_ENABLE_SDR50 0x10 58 #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300 0x20 59 #define SDHCI_MISC_CTRL_ENABLE_DDR50 0x200 60 61 #define SDHCI_TEGRA_VENDOR_DLLCAL_CFG 0x1b0 62 #define SDHCI_TEGRA_DLLCAL_CALIBRATE BIT(31) 63 64 #define SDHCI_TEGRA_VENDOR_DLLCAL_STA 0x1bc 65 #define SDHCI_TEGRA_DLLCAL_STA_ACTIVE BIT(31) 66 67 #define SDHCI_VNDR_TUN_CTRL0_0 0x1c0 68 #define SDHCI_VNDR_TUN_CTRL0_TUN_HW_TAP 0x20000 69 #define SDHCI_VNDR_TUN_CTRL0_START_TAP_VAL_MASK 0x03fc0000 70 #define SDHCI_VNDR_TUN_CTRL0_START_TAP_VAL_SHIFT 18 71 #define SDHCI_VNDR_TUN_CTRL0_MUL_M_MASK 0x00001fc0 72 #define SDHCI_VNDR_TUN_CTRL0_MUL_M_SHIFT 6 73 #define SDHCI_VNDR_TUN_CTRL0_TUN_ITER_MASK 0x000e000 74 #define SDHCI_VNDR_TUN_CTRL0_TUN_ITER_SHIFT 13 75 #define TRIES_128 2 76 #define TRIES_256 4 77 #define SDHCI_VNDR_TUN_CTRL0_TUN_WORD_SEL_MASK 0x7 78 79 #define SDHCI_TEGRA_VNDR_TUN_CTRL1_0 0x1c4 80 #define SDHCI_TEGRA_VNDR_TUN_STATUS0 0x1C8 81 #define SDHCI_TEGRA_VNDR_TUN_STATUS1 0x1CC 82 #define SDHCI_TEGRA_VNDR_TUN_STATUS1_TAP_MASK 0xFF 83 #define SDHCI_TEGRA_VNDR_TUN_STATUS1_END_TAP_SHIFT 0x8 84 #define TUNING_WORD_BIT_SIZE 32 85 86 #define SDHCI_TEGRA_AUTO_CAL_CONFIG 0x1e4 87 #define SDHCI_AUTO_CAL_START BIT(31) 88 #define SDHCI_AUTO_CAL_ENABLE BIT(29) 89 #define SDHCI_AUTO_CAL_PDPU_OFFSET_MASK 0x0000ffff 90 91 #define SDHCI_TEGRA_SDMEM_COMP_PADCTRL 0x1e0 92 #define SDHCI_TEGRA_SDMEM_COMP_PADCTRL_VREF_SEL_MASK 0x0000000f 93 #define SDHCI_TEGRA_SDMEM_COMP_PADCTRL_VREF_SEL_VAL 0x7 94 #define SDHCI_TEGRA_SDMEM_COMP_PADCTRL_E_INPUT_E_PWRD BIT(31) 95 #define SDHCI_COMP_PADCTRL_DRVUPDN_OFFSET_MASK 0x07FFF000 96 97 #define SDHCI_TEGRA_AUTO_CAL_STATUS 0x1ec 98 #define SDHCI_TEGRA_AUTO_CAL_ACTIVE BIT(31) 99 100 #define NVQUIRK_FORCE_SDHCI_SPEC_200 BIT(0) 101 #define NVQUIRK_ENABLE_BLOCK_GAP_DET BIT(1) 102 #define NVQUIRK_ENABLE_SDHCI_SPEC_300 BIT(2) 103 #define NVQUIRK_ENABLE_SDR50 BIT(3) 104 #define NVQUIRK_ENABLE_SDR104 BIT(4) 105 #define NVQUIRK_ENABLE_DDR50 BIT(5) 106 #define NVQUIRK_HAS_PADCALIB BIT(6) 107 #define NVQUIRK_NEEDS_PAD_CONTROL BIT(7) 108 #define NVQUIRK_DIS_CARD_CLK_CONFIG_TAP BIT(8) 109 #define NVQUIRK_CQHCI_DCMD_R1B_CMD_TIMING BIT(9) 110 111 /* SDMMC CQE Base Address for Tegra Host Ver 4.1 and Higher */ 112 #define SDHCI_TEGRA_CQE_BASE_ADDR 0xF000 113 114 struct sdhci_tegra_soc_data { 115 const struct sdhci_pltfm_data *pdata; 116 u32 nvquirks; 117 u8 min_tap_delay; 118 u8 max_tap_delay; 119 }; 120 121 /* Magic pull up and pull down pad calibration offsets */ 122 struct sdhci_tegra_autocal_offsets { 123 u32 pull_up_3v3; 124 u32 pull_down_3v3; 125 u32 pull_up_3v3_timeout; 126 u32 pull_down_3v3_timeout; 127 u32 pull_up_1v8; 128 u32 pull_down_1v8; 129 u32 pull_up_1v8_timeout; 130 u32 pull_down_1v8_timeout; 131 u32 pull_up_sdr104; 132 u32 pull_down_sdr104; 133 u32 pull_up_hs400; 134 u32 pull_down_hs400; 135 }; 136 137 struct sdhci_tegra { 138 const struct sdhci_tegra_soc_data *soc_data; 139 struct gpio_desc *power_gpio; 140 bool ddr_signaling; 141 bool pad_calib_required; 142 bool pad_control_available; 143 144 struct reset_control *rst; 145 struct pinctrl *pinctrl_sdmmc; 146 struct pinctrl_state *pinctrl_state_3v3; 147 struct pinctrl_state *pinctrl_state_1v8; 148 struct pinctrl_state *pinctrl_state_3v3_drv; 149 struct pinctrl_state *pinctrl_state_1v8_drv; 150 151 struct sdhci_tegra_autocal_offsets autocal_offsets; 152 ktime_t last_calib; 153 154 u32 default_tap; 155 u32 default_trim; 156 u32 dqs_trim; 157 bool enable_hwcq; 158 unsigned long curr_clk_rate; 159 u8 tuned_tap_delay; 160 }; 161 162 static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg) 163 { 164 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 165 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 166 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; 167 168 if (unlikely((soc_data->nvquirks & NVQUIRK_FORCE_SDHCI_SPEC_200) && 169 (reg == SDHCI_HOST_VERSION))) { 170 /* Erratum: Version register is invalid in HW. */ 171 return SDHCI_SPEC_200; 172 } 173 174 return readw(host->ioaddr + reg); 175 } 176 177 static void tegra_sdhci_writew(struct sdhci_host *host, u16 val, int reg) 178 { 179 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 180 181 switch (reg) { 182 case SDHCI_TRANSFER_MODE: 183 /* 184 * Postpone this write, we must do it together with a 185 * command write that is down below. 186 */ 187 pltfm_host->xfer_mode_shadow = val; 188 return; 189 case SDHCI_COMMAND: 190 writel((val << 16) | pltfm_host->xfer_mode_shadow, 191 host->ioaddr + SDHCI_TRANSFER_MODE); 192 return; 193 } 194 195 writew(val, host->ioaddr + reg); 196 } 197 198 static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg) 199 { 200 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 201 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 202 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; 203 204 /* Seems like we're getting spurious timeout and crc errors, so 205 * disable signalling of them. In case of real errors software 206 * timers should take care of eventually detecting them. 207 */ 208 if (unlikely(reg == SDHCI_SIGNAL_ENABLE)) 209 val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC); 210 211 writel(val, host->ioaddr + reg); 212 213 if (unlikely((soc_data->nvquirks & NVQUIRK_ENABLE_BLOCK_GAP_DET) && 214 (reg == SDHCI_INT_ENABLE))) { 215 /* Erratum: Must enable block gap interrupt detection */ 216 u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL); 217 if (val & SDHCI_INT_CARD_INT) 218 gap_ctrl |= 0x8; 219 else 220 gap_ctrl &= ~0x8; 221 writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL); 222 } 223 } 224 225 static bool tegra_sdhci_configure_card_clk(struct sdhci_host *host, bool enable) 226 { 227 bool status; 228 u32 reg; 229 230 reg = sdhci_readw(host, SDHCI_CLOCK_CONTROL); 231 status = !!(reg & SDHCI_CLOCK_CARD_EN); 232 233 if (status == enable) 234 return status; 235 236 if (enable) 237 reg |= SDHCI_CLOCK_CARD_EN; 238 else 239 reg &= ~SDHCI_CLOCK_CARD_EN; 240 241 sdhci_writew(host, reg, SDHCI_CLOCK_CONTROL); 242 243 return status; 244 } 245 246 static void tegra210_sdhci_writew(struct sdhci_host *host, u16 val, int reg) 247 { 248 bool is_tuning_cmd = 0; 249 bool clk_enabled; 250 u8 cmd; 251 252 if (reg == SDHCI_COMMAND) { 253 cmd = SDHCI_GET_CMD(val); 254 is_tuning_cmd = cmd == MMC_SEND_TUNING_BLOCK || 255 cmd == MMC_SEND_TUNING_BLOCK_HS200; 256 } 257 258 if (is_tuning_cmd) 259 clk_enabled = tegra_sdhci_configure_card_clk(host, 0); 260 261 writew(val, host->ioaddr + reg); 262 263 if (is_tuning_cmd) { 264 udelay(1); 265 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); 266 tegra_sdhci_configure_card_clk(host, clk_enabled); 267 } 268 } 269 270 static bool tegra_sdhci_is_pad_and_regulator_valid(struct sdhci_host *host) 271 { 272 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 273 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 274 int has_1v8, has_3v3; 275 276 /* 277 * The SoCs which have NVQUIRK_NEEDS_PAD_CONTROL require software pad 278 * voltage configuration in order to perform voltage switching. This 279 * means that valid pinctrl info is required on SDHCI instances capable 280 * of performing voltage switching. Whether or not an SDHCI instance is 281 * capable of voltage switching is determined based on the regulator. 282 */ 283 284 if (!(tegra_host->soc_data->nvquirks & NVQUIRK_NEEDS_PAD_CONTROL)) 285 return true; 286 287 if (IS_ERR(host->mmc->supply.vqmmc)) 288 return false; 289 290 has_1v8 = regulator_is_supported_voltage(host->mmc->supply.vqmmc, 291 1700000, 1950000); 292 293 has_3v3 = regulator_is_supported_voltage(host->mmc->supply.vqmmc, 294 2700000, 3600000); 295 296 if (has_1v8 == 1 && has_3v3 == 1) 297 return tegra_host->pad_control_available; 298 299 /* Fixed voltage, no pad control required. */ 300 return true; 301 } 302 303 static void tegra_sdhci_set_tap(struct sdhci_host *host, unsigned int tap) 304 { 305 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 306 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 307 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; 308 bool card_clk_enabled = false; 309 u32 reg; 310 311 /* 312 * Touching the tap values is a bit tricky on some SoC generations. 313 * The quirk enables a workaround for a glitch that sometimes occurs if 314 * the tap values are changed. 315 */ 316 317 if (soc_data->nvquirks & NVQUIRK_DIS_CARD_CLK_CONFIG_TAP) 318 card_clk_enabled = tegra_sdhci_configure_card_clk(host, false); 319 320 reg = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); 321 reg &= ~SDHCI_CLOCK_CTRL_TAP_MASK; 322 reg |= tap << SDHCI_CLOCK_CTRL_TAP_SHIFT; 323 sdhci_writel(host, reg, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); 324 325 if (soc_data->nvquirks & NVQUIRK_DIS_CARD_CLK_CONFIG_TAP && 326 card_clk_enabled) { 327 udelay(1); 328 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); 329 tegra_sdhci_configure_card_clk(host, card_clk_enabled); 330 } 331 } 332 333 static void tegra_sdhci_hs400_enhanced_strobe(struct mmc_host *mmc, 334 struct mmc_ios *ios) 335 { 336 struct sdhci_host *host = mmc_priv(mmc); 337 u32 val; 338 339 val = sdhci_readl(host, SDHCI_TEGRA_VENDOR_SYS_SW_CTRL); 340 341 if (ios->enhanced_strobe) 342 val |= SDHCI_TEGRA_SYS_SW_CTRL_ENHANCED_STROBE; 343 else 344 val &= ~SDHCI_TEGRA_SYS_SW_CTRL_ENHANCED_STROBE; 345 346 sdhci_writel(host, val, SDHCI_TEGRA_VENDOR_SYS_SW_CTRL); 347 348 } 349 350 static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask) 351 { 352 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 353 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 354 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; 355 u32 misc_ctrl, clk_ctrl, pad_ctrl; 356 357 sdhci_reset(host, mask); 358 359 if (!(mask & SDHCI_RESET_ALL)) 360 return; 361 362 tegra_sdhci_set_tap(host, tegra_host->default_tap); 363 364 misc_ctrl = sdhci_readl(host, SDHCI_TEGRA_VENDOR_MISC_CTRL); 365 clk_ctrl = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); 366 367 misc_ctrl &= ~(SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300 | 368 SDHCI_MISC_CTRL_ENABLE_SDR50 | 369 SDHCI_MISC_CTRL_ENABLE_DDR50 | 370 SDHCI_MISC_CTRL_ENABLE_SDR104); 371 372 clk_ctrl &= ~(SDHCI_CLOCK_CTRL_TRIM_MASK | 373 SDHCI_CLOCK_CTRL_SPI_MODE_CLKEN_OVERRIDE); 374 375 if (tegra_sdhci_is_pad_and_regulator_valid(host)) { 376 /* Erratum: Enable SDHCI spec v3.00 support */ 377 if (soc_data->nvquirks & NVQUIRK_ENABLE_SDHCI_SPEC_300) 378 misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300; 379 /* Advertise UHS modes as supported by host */ 380 if (soc_data->nvquirks & NVQUIRK_ENABLE_SDR50) 381 misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDR50; 382 if (soc_data->nvquirks & NVQUIRK_ENABLE_DDR50) 383 misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_DDR50; 384 if (soc_data->nvquirks & NVQUIRK_ENABLE_SDR104) 385 misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDR104; 386 if (soc_data->nvquirks & SDHCI_MISC_CTRL_ENABLE_SDR50) 387 clk_ctrl |= SDHCI_CLOCK_CTRL_SDR50_TUNING_OVERRIDE; 388 } 389 390 clk_ctrl |= tegra_host->default_trim << SDHCI_CLOCK_CTRL_TRIM_SHIFT; 391 392 sdhci_writel(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL); 393 sdhci_writel(host, clk_ctrl, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); 394 395 if (soc_data->nvquirks & NVQUIRK_HAS_PADCALIB) { 396 pad_ctrl = sdhci_readl(host, SDHCI_TEGRA_SDMEM_COMP_PADCTRL); 397 pad_ctrl &= ~SDHCI_TEGRA_SDMEM_COMP_PADCTRL_VREF_SEL_MASK; 398 pad_ctrl |= SDHCI_TEGRA_SDMEM_COMP_PADCTRL_VREF_SEL_VAL; 399 sdhci_writel(host, pad_ctrl, SDHCI_TEGRA_SDMEM_COMP_PADCTRL); 400 401 tegra_host->pad_calib_required = true; 402 } 403 404 tegra_host->ddr_signaling = false; 405 } 406 407 static void tegra_sdhci_configure_cal_pad(struct sdhci_host *host, bool enable) 408 { 409 u32 val; 410 411 /* 412 * Enable or disable the additional I/O pad used by the drive strength 413 * calibration process. 414 */ 415 val = sdhci_readl(host, SDHCI_TEGRA_SDMEM_COMP_PADCTRL); 416 417 if (enable) 418 val |= SDHCI_TEGRA_SDMEM_COMP_PADCTRL_E_INPUT_E_PWRD; 419 else 420 val &= ~SDHCI_TEGRA_SDMEM_COMP_PADCTRL_E_INPUT_E_PWRD; 421 422 sdhci_writel(host, val, SDHCI_TEGRA_SDMEM_COMP_PADCTRL); 423 424 if (enable) 425 usleep_range(1, 2); 426 } 427 428 static void tegra_sdhci_set_pad_autocal_offset(struct sdhci_host *host, 429 u16 pdpu) 430 { 431 u32 reg; 432 433 reg = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG); 434 reg &= ~SDHCI_AUTO_CAL_PDPU_OFFSET_MASK; 435 reg |= pdpu; 436 sdhci_writel(host, reg, SDHCI_TEGRA_AUTO_CAL_CONFIG); 437 } 438 439 static int tegra_sdhci_set_padctrl(struct sdhci_host *host, int voltage, 440 bool state_drvupdn) 441 { 442 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 443 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 444 struct sdhci_tegra_autocal_offsets *offsets = 445 &tegra_host->autocal_offsets; 446 struct pinctrl_state *pinctrl_drvupdn = NULL; 447 int ret = 0; 448 u8 drvup = 0, drvdn = 0; 449 u32 reg; 450 451 if (!state_drvupdn) { 452 /* PADS Drive Strength */ 453 if (voltage == MMC_SIGNAL_VOLTAGE_180) { 454 if (tegra_host->pinctrl_state_1v8_drv) { 455 pinctrl_drvupdn = 456 tegra_host->pinctrl_state_1v8_drv; 457 } else { 458 drvup = offsets->pull_up_1v8_timeout; 459 drvdn = offsets->pull_down_1v8_timeout; 460 } 461 } else { 462 if (tegra_host->pinctrl_state_3v3_drv) { 463 pinctrl_drvupdn = 464 tegra_host->pinctrl_state_3v3_drv; 465 } else { 466 drvup = offsets->pull_up_3v3_timeout; 467 drvdn = offsets->pull_down_3v3_timeout; 468 } 469 } 470 471 if (pinctrl_drvupdn != NULL) { 472 ret = pinctrl_select_state(tegra_host->pinctrl_sdmmc, 473 pinctrl_drvupdn); 474 if (ret < 0) 475 dev_err(mmc_dev(host->mmc), 476 "failed pads drvupdn, ret: %d\n", ret); 477 } else if ((drvup) || (drvdn)) { 478 reg = sdhci_readl(host, 479 SDHCI_TEGRA_SDMEM_COMP_PADCTRL); 480 reg &= ~SDHCI_COMP_PADCTRL_DRVUPDN_OFFSET_MASK; 481 reg |= (drvup << 20) | (drvdn << 12); 482 sdhci_writel(host, reg, 483 SDHCI_TEGRA_SDMEM_COMP_PADCTRL); 484 } 485 486 } else { 487 /* Dual Voltage PADS Voltage selection */ 488 if (!tegra_host->pad_control_available) 489 return 0; 490 491 if (voltage == MMC_SIGNAL_VOLTAGE_180) { 492 ret = pinctrl_select_state(tegra_host->pinctrl_sdmmc, 493 tegra_host->pinctrl_state_1v8); 494 if (ret < 0) 495 dev_err(mmc_dev(host->mmc), 496 "setting 1.8V failed, ret: %d\n", ret); 497 } else { 498 ret = pinctrl_select_state(tegra_host->pinctrl_sdmmc, 499 tegra_host->pinctrl_state_3v3); 500 if (ret < 0) 501 dev_err(mmc_dev(host->mmc), 502 "setting 3.3V failed, ret: %d\n", ret); 503 } 504 } 505 506 return ret; 507 } 508 509 static void tegra_sdhci_pad_autocalib(struct sdhci_host *host) 510 { 511 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 512 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 513 struct sdhci_tegra_autocal_offsets offsets = 514 tegra_host->autocal_offsets; 515 struct mmc_ios *ios = &host->mmc->ios; 516 bool card_clk_enabled; 517 u16 pdpu; 518 u32 reg; 519 int ret; 520 521 switch (ios->timing) { 522 case MMC_TIMING_UHS_SDR104: 523 pdpu = offsets.pull_down_sdr104 << 8 | offsets.pull_up_sdr104; 524 break; 525 case MMC_TIMING_MMC_HS400: 526 pdpu = offsets.pull_down_hs400 << 8 | offsets.pull_up_hs400; 527 break; 528 default: 529 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) 530 pdpu = offsets.pull_down_1v8 << 8 | offsets.pull_up_1v8; 531 else 532 pdpu = offsets.pull_down_3v3 << 8 | offsets.pull_up_3v3; 533 } 534 535 /* Set initial offset before auto-calibration */ 536 tegra_sdhci_set_pad_autocal_offset(host, pdpu); 537 538 card_clk_enabled = tegra_sdhci_configure_card_clk(host, false); 539 540 tegra_sdhci_configure_cal_pad(host, true); 541 542 reg = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG); 543 reg |= SDHCI_AUTO_CAL_ENABLE | SDHCI_AUTO_CAL_START; 544 sdhci_writel(host, reg, SDHCI_TEGRA_AUTO_CAL_CONFIG); 545 546 usleep_range(1, 2); 547 /* 10 ms timeout */ 548 ret = readl_poll_timeout(host->ioaddr + SDHCI_TEGRA_AUTO_CAL_STATUS, 549 reg, !(reg & SDHCI_TEGRA_AUTO_CAL_ACTIVE), 550 1000, 10000); 551 552 tegra_sdhci_configure_cal_pad(host, false); 553 554 tegra_sdhci_configure_card_clk(host, card_clk_enabled); 555 556 if (ret) { 557 dev_err(mmc_dev(host->mmc), "Pad autocal timed out\n"); 558 559 /* Disable automatic cal and use fixed Drive Strengths */ 560 reg = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG); 561 reg &= ~SDHCI_AUTO_CAL_ENABLE; 562 sdhci_writel(host, reg, SDHCI_TEGRA_AUTO_CAL_CONFIG); 563 564 ret = tegra_sdhci_set_padctrl(host, ios->signal_voltage, false); 565 if (ret < 0) 566 dev_err(mmc_dev(host->mmc), 567 "Setting drive strengths failed: %d\n", ret); 568 } 569 } 570 571 static void tegra_sdhci_parse_pad_autocal_dt(struct sdhci_host *host) 572 { 573 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 574 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 575 struct sdhci_tegra_autocal_offsets *autocal = 576 &tegra_host->autocal_offsets; 577 int err; 578 579 err = device_property_read_u32(host->mmc->parent, 580 "nvidia,pad-autocal-pull-up-offset-3v3", 581 &autocal->pull_up_3v3); 582 if (err) 583 autocal->pull_up_3v3 = 0; 584 585 err = device_property_read_u32(host->mmc->parent, 586 "nvidia,pad-autocal-pull-down-offset-3v3", 587 &autocal->pull_down_3v3); 588 if (err) 589 autocal->pull_down_3v3 = 0; 590 591 err = device_property_read_u32(host->mmc->parent, 592 "nvidia,pad-autocal-pull-up-offset-1v8", 593 &autocal->pull_up_1v8); 594 if (err) 595 autocal->pull_up_1v8 = 0; 596 597 err = device_property_read_u32(host->mmc->parent, 598 "nvidia,pad-autocal-pull-down-offset-1v8", 599 &autocal->pull_down_1v8); 600 if (err) 601 autocal->pull_down_1v8 = 0; 602 603 err = device_property_read_u32(host->mmc->parent, 604 "nvidia,pad-autocal-pull-up-offset-3v3-timeout", 605 &autocal->pull_up_3v3_timeout); 606 if (err) { 607 if (!IS_ERR(tegra_host->pinctrl_state_3v3) && 608 (tegra_host->pinctrl_state_3v3_drv == NULL)) 609 pr_warn("%s: Missing autocal timeout 3v3-pad drvs\n", 610 mmc_hostname(host->mmc)); 611 autocal->pull_up_3v3_timeout = 0; 612 } 613 614 err = device_property_read_u32(host->mmc->parent, 615 "nvidia,pad-autocal-pull-down-offset-3v3-timeout", 616 &autocal->pull_down_3v3_timeout); 617 if (err) { 618 if (!IS_ERR(tegra_host->pinctrl_state_3v3) && 619 (tegra_host->pinctrl_state_3v3_drv == NULL)) 620 pr_warn("%s: Missing autocal timeout 3v3-pad drvs\n", 621 mmc_hostname(host->mmc)); 622 autocal->pull_down_3v3_timeout = 0; 623 } 624 625 err = device_property_read_u32(host->mmc->parent, 626 "nvidia,pad-autocal-pull-up-offset-1v8-timeout", 627 &autocal->pull_up_1v8_timeout); 628 if (err) { 629 if (!IS_ERR(tegra_host->pinctrl_state_1v8) && 630 (tegra_host->pinctrl_state_1v8_drv == NULL)) 631 pr_warn("%s: Missing autocal timeout 1v8-pad drvs\n", 632 mmc_hostname(host->mmc)); 633 autocal->pull_up_1v8_timeout = 0; 634 } 635 636 err = device_property_read_u32(host->mmc->parent, 637 "nvidia,pad-autocal-pull-down-offset-1v8-timeout", 638 &autocal->pull_down_1v8_timeout); 639 if (err) { 640 if (!IS_ERR(tegra_host->pinctrl_state_1v8) && 641 (tegra_host->pinctrl_state_1v8_drv == NULL)) 642 pr_warn("%s: Missing autocal timeout 1v8-pad drvs\n", 643 mmc_hostname(host->mmc)); 644 autocal->pull_down_1v8_timeout = 0; 645 } 646 647 err = device_property_read_u32(host->mmc->parent, 648 "nvidia,pad-autocal-pull-up-offset-sdr104", 649 &autocal->pull_up_sdr104); 650 if (err) 651 autocal->pull_up_sdr104 = autocal->pull_up_1v8; 652 653 err = device_property_read_u32(host->mmc->parent, 654 "nvidia,pad-autocal-pull-down-offset-sdr104", 655 &autocal->pull_down_sdr104); 656 if (err) 657 autocal->pull_down_sdr104 = autocal->pull_down_1v8; 658 659 err = device_property_read_u32(host->mmc->parent, 660 "nvidia,pad-autocal-pull-up-offset-hs400", 661 &autocal->pull_up_hs400); 662 if (err) 663 autocal->pull_up_hs400 = autocal->pull_up_1v8; 664 665 err = device_property_read_u32(host->mmc->parent, 666 "nvidia,pad-autocal-pull-down-offset-hs400", 667 &autocal->pull_down_hs400); 668 if (err) 669 autocal->pull_down_hs400 = autocal->pull_down_1v8; 670 } 671 672 static void tegra_sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) 673 { 674 struct sdhci_host *host = mmc_priv(mmc); 675 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 676 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 677 ktime_t since_calib = ktime_sub(ktime_get(), tegra_host->last_calib); 678 679 /* 100 ms calibration interval is specified in the TRM */ 680 if (ktime_to_ms(since_calib) > 100) { 681 tegra_sdhci_pad_autocalib(host); 682 tegra_host->last_calib = ktime_get(); 683 } 684 685 sdhci_request(mmc, mrq); 686 } 687 688 static void tegra_sdhci_parse_tap_and_trim(struct sdhci_host *host) 689 { 690 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 691 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 692 int err; 693 694 err = device_property_read_u32(host->mmc->parent, "nvidia,default-tap", 695 &tegra_host->default_tap); 696 if (err) 697 tegra_host->default_tap = 0; 698 699 err = device_property_read_u32(host->mmc->parent, "nvidia,default-trim", 700 &tegra_host->default_trim); 701 if (err) 702 tegra_host->default_trim = 0; 703 704 err = device_property_read_u32(host->mmc->parent, "nvidia,dqs-trim", 705 &tegra_host->dqs_trim); 706 if (err) 707 tegra_host->dqs_trim = 0x11; 708 } 709 710 static void tegra_sdhci_parse_dt(struct sdhci_host *host) 711 { 712 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 713 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 714 715 if (device_property_read_bool(host->mmc->parent, "supports-cqe")) 716 tegra_host->enable_hwcq = true; 717 else 718 tegra_host->enable_hwcq = false; 719 720 tegra_sdhci_parse_pad_autocal_dt(host); 721 tegra_sdhci_parse_tap_and_trim(host); 722 } 723 724 static void tegra_sdhci_set_clock(struct sdhci_host *host, unsigned int clock) 725 { 726 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 727 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 728 unsigned long host_clk; 729 730 if (!clock) 731 return sdhci_set_clock(host, clock); 732 733 /* 734 * In DDR50/52 modes the Tegra SDHCI controllers require the SDHCI 735 * divider to be configured to divided the host clock by two. The SDHCI 736 * clock divider is calculated as part of sdhci_set_clock() by 737 * sdhci_calc_clk(). The divider is calculated from host->max_clk and 738 * the requested clock rate. 739 * 740 * By setting the host->max_clk to clock * 2 the divider calculation 741 * will always result in the correct value for DDR50/52 modes, 742 * regardless of clock rate rounding, which may happen if the value 743 * from clk_get_rate() is used. 744 */ 745 host_clk = tegra_host->ddr_signaling ? clock * 2 : clock; 746 clk_set_rate(pltfm_host->clk, host_clk); 747 tegra_host->curr_clk_rate = host_clk; 748 if (tegra_host->ddr_signaling) 749 host->max_clk = host_clk; 750 else 751 host->max_clk = clk_get_rate(pltfm_host->clk); 752 753 sdhci_set_clock(host, clock); 754 755 if (tegra_host->pad_calib_required) { 756 tegra_sdhci_pad_autocalib(host); 757 tegra_host->pad_calib_required = false; 758 } 759 } 760 761 static unsigned int tegra_sdhci_get_max_clock(struct sdhci_host *host) 762 { 763 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 764 765 return clk_round_rate(pltfm_host->clk, UINT_MAX); 766 } 767 768 static void tegra_sdhci_set_dqs_trim(struct sdhci_host *host, u8 trim) 769 { 770 u32 val; 771 772 val = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CAP_OVERRIDES); 773 val &= ~SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_MASK; 774 val |= trim << SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_SHIFT; 775 sdhci_writel(host, val, SDHCI_TEGRA_VENDOR_CAP_OVERRIDES); 776 } 777 778 static void tegra_sdhci_hs400_dll_cal(struct sdhci_host *host) 779 { 780 u32 reg; 781 int err; 782 783 reg = sdhci_readl(host, SDHCI_TEGRA_VENDOR_DLLCAL_CFG); 784 reg |= SDHCI_TEGRA_DLLCAL_CALIBRATE; 785 sdhci_writel(host, reg, SDHCI_TEGRA_VENDOR_DLLCAL_CFG); 786 787 /* 1 ms sleep, 5 ms timeout */ 788 err = readl_poll_timeout(host->ioaddr + SDHCI_TEGRA_VENDOR_DLLCAL_STA, 789 reg, !(reg & SDHCI_TEGRA_DLLCAL_STA_ACTIVE), 790 1000, 5000); 791 if (err) 792 dev_err(mmc_dev(host->mmc), 793 "HS400 delay line calibration timed out\n"); 794 } 795 796 static void tegra_sdhci_tap_correction(struct sdhci_host *host, u8 thd_up, 797 u8 thd_low, u8 fixed_tap) 798 { 799 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 800 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 801 u32 val, tun_status; 802 u8 word, bit, edge1, tap, window; 803 bool tap_result; 804 bool start_fail = false; 805 bool start_pass = false; 806 bool end_pass = false; 807 bool first_fail = false; 808 bool first_pass = false; 809 u8 start_pass_tap = 0; 810 u8 end_pass_tap = 0; 811 u8 first_fail_tap = 0; 812 u8 first_pass_tap = 0; 813 u8 total_tuning_words = host->tuning_loop_count / TUNING_WORD_BIT_SIZE; 814 815 /* 816 * Read auto-tuned results and extract good valid passing window by 817 * filtering out un-wanted bubble/partial/merged windows. 818 */ 819 for (word = 0; word < total_tuning_words; word++) { 820 val = sdhci_readl(host, SDHCI_VNDR_TUN_CTRL0_0); 821 val &= ~SDHCI_VNDR_TUN_CTRL0_TUN_WORD_SEL_MASK; 822 val |= word; 823 sdhci_writel(host, val, SDHCI_VNDR_TUN_CTRL0_0); 824 tun_status = sdhci_readl(host, SDHCI_TEGRA_VNDR_TUN_STATUS0); 825 bit = 0; 826 while (bit < TUNING_WORD_BIT_SIZE) { 827 tap = word * TUNING_WORD_BIT_SIZE + bit; 828 tap_result = tun_status & (1 << bit); 829 if (!tap_result && !start_fail) { 830 start_fail = true; 831 if (!first_fail) { 832 first_fail_tap = tap; 833 first_fail = true; 834 } 835 836 } else if (tap_result && start_fail && !start_pass) { 837 start_pass_tap = tap; 838 start_pass = true; 839 if (!first_pass) { 840 first_pass_tap = tap; 841 first_pass = true; 842 } 843 844 } else if (!tap_result && start_fail && start_pass && 845 !end_pass) { 846 end_pass_tap = tap - 1; 847 end_pass = true; 848 } else if (tap_result && start_pass && start_fail && 849 end_pass) { 850 window = end_pass_tap - start_pass_tap; 851 /* discard merged window and bubble window */ 852 if (window >= thd_up || window < thd_low) { 853 start_pass_tap = tap; 854 end_pass = false; 855 } else { 856 /* set tap at middle of valid window */ 857 tap = start_pass_tap + window / 2; 858 tegra_host->tuned_tap_delay = tap; 859 return; 860 } 861 } 862 863 bit++; 864 } 865 } 866 867 if (!first_fail) { 868 WARN_ON("no edge detected, continue with hw tuned delay.\n"); 869 } else if (first_pass) { 870 /* set tap location at fixed tap relative to the first edge */ 871 edge1 = first_fail_tap + (first_pass_tap - first_fail_tap) / 2; 872 if (edge1 - 1 > fixed_tap) 873 tegra_host->tuned_tap_delay = edge1 - fixed_tap; 874 else 875 tegra_host->tuned_tap_delay = edge1 + fixed_tap; 876 } 877 } 878 879 static void tegra_sdhci_post_tuning(struct sdhci_host *host) 880 { 881 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 882 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 883 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; 884 u32 avg_tap_dly, val, min_tap_dly, max_tap_dly; 885 u8 fixed_tap, start_tap, end_tap, window_width; 886 u8 thdupper, thdlower; 887 u8 num_iter; 888 u32 clk_rate_mhz, period_ps, bestcase, worstcase; 889 890 /* retain HW tuned tap to use incase if no correction is needed */ 891 val = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); 892 tegra_host->tuned_tap_delay = (val & SDHCI_CLOCK_CTRL_TAP_MASK) >> 893 SDHCI_CLOCK_CTRL_TAP_SHIFT; 894 if (soc_data->min_tap_delay && soc_data->max_tap_delay) { 895 min_tap_dly = soc_data->min_tap_delay; 896 max_tap_dly = soc_data->max_tap_delay; 897 clk_rate_mhz = tegra_host->curr_clk_rate / USEC_PER_SEC; 898 period_ps = USEC_PER_SEC / clk_rate_mhz; 899 bestcase = period_ps / min_tap_dly; 900 worstcase = period_ps / max_tap_dly; 901 /* 902 * Upper and Lower bound thresholds used to detect merged and 903 * bubble windows 904 */ 905 thdupper = (2 * worstcase + bestcase) / 2; 906 thdlower = worstcase / 4; 907 /* 908 * fixed tap is used when HW tuning result contains single edge 909 * and tap is set at fixed tap delay relative to the first edge 910 */ 911 avg_tap_dly = (period_ps * 2) / (min_tap_dly + max_tap_dly); 912 fixed_tap = avg_tap_dly / 2; 913 914 val = sdhci_readl(host, SDHCI_TEGRA_VNDR_TUN_STATUS1); 915 start_tap = val & SDHCI_TEGRA_VNDR_TUN_STATUS1_TAP_MASK; 916 end_tap = (val >> SDHCI_TEGRA_VNDR_TUN_STATUS1_END_TAP_SHIFT) & 917 SDHCI_TEGRA_VNDR_TUN_STATUS1_TAP_MASK; 918 window_width = end_tap - start_tap; 919 num_iter = host->tuning_loop_count; 920 /* 921 * partial window includes edges of the tuning range. 922 * merged window includes more taps so window width is higher 923 * than upper threshold. 924 */ 925 if (start_tap == 0 || (end_tap == (num_iter - 1)) || 926 (end_tap == num_iter - 2) || window_width >= thdupper) { 927 pr_debug("%s: Apply tuning correction\n", 928 mmc_hostname(host->mmc)); 929 tegra_sdhci_tap_correction(host, thdupper, thdlower, 930 fixed_tap); 931 } 932 } 933 934 tegra_sdhci_set_tap(host, tegra_host->tuned_tap_delay); 935 } 936 937 static int tegra_sdhci_execute_hw_tuning(struct mmc_host *mmc, u32 opcode) 938 { 939 struct sdhci_host *host = mmc_priv(mmc); 940 int err; 941 942 err = sdhci_execute_tuning(mmc, opcode); 943 if (!err && !host->tuning_err) 944 tegra_sdhci_post_tuning(host); 945 946 return err; 947 } 948 949 static void tegra_sdhci_set_uhs_signaling(struct sdhci_host *host, 950 unsigned timing) 951 { 952 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 953 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 954 bool set_default_tap = false; 955 bool set_dqs_trim = false; 956 bool do_hs400_dll_cal = false; 957 u8 iter = TRIES_256; 958 u32 val; 959 960 tegra_host->ddr_signaling = false; 961 switch (timing) { 962 case MMC_TIMING_UHS_SDR50: 963 break; 964 case MMC_TIMING_UHS_SDR104: 965 case MMC_TIMING_MMC_HS200: 966 /* Don't set default tap on tunable modes. */ 967 iter = TRIES_128; 968 break; 969 case MMC_TIMING_MMC_HS400: 970 set_dqs_trim = true; 971 do_hs400_dll_cal = true; 972 iter = TRIES_128; 973 break; 974 case MMC_TIMING_MMC_DDR52: 975 case MMC_TIMING_UHS_DDR50: 976 tegra_host->ddr_signaling = true; 977 set_default_tap = true; 978 break; 979 default: 980 set_default_tap = true; 981 break; 982 } 983 984 val = sdhci_readl(host, SDHCI_VNDR_TUN_CTRL0_0); 985 val &= ~(SDHCI_VNDR_TUN_CTRL0_TUN_ITER_MASK | 986 SDHCI_VNDR_TUN_CTRL0_START_TAP_VAL_MASK | 987 SDHCI_VNDR_TUN_CTRL0_MUL_M_MASK); 988 val |= (iter << SDHCI_VNDR_TUN_CTRL0_TUN_ITER_SHIFT | 989 0 << SDHCI_VNDR_TUN_CTRL0_START_TAP_VAL_SHIFT | 990 1 << SDHCI_VNDR_TUN_CTRL0_MUL_M_SHIFT); 991 sdhci_writel(host, val, SDHCI_VNDR_TUN_CTRL0_0); 992 sdhci_writel(host, 0, SDHCI_TEGRA_VNDR_TUN_CTRL1_0); 993 994 host->tuning_loop_count = (iter == TRIES_128) ? 128 : 256; 995 996 sdhci_set_uhs_signaling(host, timing); 997 998 tegra_sdhci_pad_autocalib(host); 999 1000 if (tegra_host->tuned_tap_delay && !set_default_tap) 1001 tegra_sdhci_set_tap(host, tegra_host->tuned_tap_delay); 1002 else 1003 tegra_sdhci_set_tap(host, tegra_host->default_tap); 1004 1005 if (set_dqs_trim) 1006 tegra_sdhci_set_dqs_trim(host, tegra_host->dqs_trim); 1007 1008 if (do_hs400_dll_cal) 1009 tegra_sdhci_hs400_dll_cal(host); 1010 } 1011 1012 static int tegra_sdhci_execute_tuning(struct sdhci_host *host, u32 opcode) 1013 { 1014 unsigned int min, max; 1015 1016 /* 1017 * Start search for minimum tap value at 10, as smaller values are 1018 * may wrongly be reported as working but fail at higher speeds, 1019 * according to the TRM. 1020 */ 1021 min = 10; 1022 while (min < 255) { 1023 tegra_sdhci_set_tap(host, min); 1024 if (!mmc_send_tuning(host->mmc, opcode, NULL)) 1025 break; 1026 min++; 1027 } 1028 1029 /* Find the maximum tap value that still passes. */ 1030 max = min + 1; 1031 while (max < 255) { 1032 tegra_sdhci_set_tap(host, max); 1033 if (mmc_send_tuning(host->mmc, opcode, NULL)) { 1034 max--; 1035 break; 1036 } 1037 max++; 1038 } 1039 1040 /* The TRM states the ideal tap value is at 75% in the passing range. */ 1041 tegra_sdhci_set_tap(host, min + ((max - min) * 3 / 4)); 1042 1043 return mmc_send_tuning(host->mmc, opcode, NULL); 1044 } 1045 1046 static int sdhci_tegra_start_signal_voltage_switch(struct mmc_host *mmc, 1047 struct mmc_ios *ios) 1048 { 1049 struct sdhci_host *host = mmc_priv(mmc); 1050 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 1051 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 1052 int ret = 0; 1053 1054 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) { 1055 ret = tegra_sdhci_set_padctrl(host, ios->signal_voltage, true); 1056 if (ret < 0) 1057 return ret; 1058 ret = sdhci_start_signal_voltage_switch(mmc, ios); 1059 } else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) { 1060 ret = sdhci_start_signal_voltage_switch(mmc, ios); 1061 if (ret < 0) 1062 return ret; 1063 ret = tegra_sdhci_set_padctrl(host, ios->signal_voltage, true); 1064 } 1065 1066 if (tegra_host->pad_calib_required) 1067 tegra_sdhci_pad_autocalib(host); 1068 1069 return ret; 1070 } 1071 1072 static int tegra_sdhci_init_pinctrl_info(struct device *dev, 1073 struct sdhci_tegra *tegra_host) 1074 { 1075 tegra_host->pinctrl_sdmmc = devm_pinctrl_get(dev); 1076 if (IS_ERR(tegra_host->pinctrl_sdmmc)) { 1077 dev_dbg(dev, "No pinctrl info, err: %ld\n", 1078 PTR_ERR(tegra_host->pinctrl_sdmmc)); 1079 return -1; 1080 } 1081 1082 tegra_host->pinctrl_state_1v8_drv = pinctrl_lookup_state( 1083 tegra_host->pinctrl_sdmmc, "sdmmc-1v8-drv"); 1084 if (IS_ERR(tegra_host->pinctrl_state_1v8_drv)) { 1085 if (PTR_ERR(tegra_host->pinctrl_state_1v8_drv) == -ENODEV) 1086 tegra_host->pinctrl_state_1v8_drv = NULL; 1087 } 1088 1089 tegra_host->pinctrl_state_3v3_drv = pinctrl_lookup_state( 1090 tegra_host->pinctrl_sdmmc, "sdmmc-3v3-drv"); 1091 if (IS_ERR(tegra_host->pinctrl_state_3v3_drv)) { 1092 if (PTR_ERR(tegra_host->pinctrl_state_3v3_drv) == -ENODEV) 1093 tegra_host->pinctrl_state_3v3_drv = NULL; 1094 } 1095 1096 tegra_host->pinctrl_state_3v3 = 1097 pinctrl_lookup_state(tegra_host->pinctrl_sdmmc, "sdmmc-3v3"); 1098 if (IS_ERR(tegra_host->pinctrl_state_3v3)) { 1099 dev_warn(dev, "Missing 3.3V pad state, err: %ld\n", 1100 PTR_ERR(tegra_host->pinctrl_state_3v3)); 1101 return -1; 1102 } 1103 1104 tegra_host->pinctrl_state_1v8 = 1105 pinctrl_lookup_state(tegra_host->pinctrl_sdmmc, "sdmmc-1v8"); 1106 if (IS_ERR(tegra_host->pinctrl_state_1v8)) { 1107 dev_warn(dev, "Missing 1.8V pad state, err: %ld\n", 1108 PTR_ERR(tegra_host->pinctrl_state_1v8)); 1109 return -1; 1110 } 1111 1112 tegra_host->pad_control_available = true; 1113 1114 return 0; 1115 } 1116 1117 static void tegra_sdhci_voltage_switch(struct sdhci_host *host) 1118 { 1119 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 1120 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 1121 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; 1122 1123 if (soc_data->nvquirks & NVQUIRK_HAS_PADCALIB) 1124 tegra_host->pad_calib_required = true; 1125 } 1126 1127 static void sdhci_tegra_update_dcmd_desc(struct mmc_host *mmc, 1128 struct mmc_request *mrq, u64 *data) 1129 { 1130 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(mmc_priv(mmc)); 1131 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 1132 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; 1133 1134 if (soc_data->nvquirks & NVQUIRK_CQHCI_DCMD_R1B_CMD_TIMING && 1135 mrq->cmd->flags & MMC_RSP_R1B) 1136 *data |= CQHCI_CMD_TIMING(1); 1137 } 1138 1139 static void sdhci_tegra_cqe_enable(struct mmc_host *mmc) 1140 { 1141 struct cqhci_host *cq_host = mmc->cqe_private; 1142 u32 cqcfg = 0; 1143 1144 /* 1145 * Tegra SDMMC Controller design prevents write access to BLOCK_COUNT 1146 * registers when CQE is enabled. 1147 */ 1148 cqcfg = cqhci_readl(cq_host, CQHCI_CFG); 1149 if (cqcfg & CQHCI_ENABLE) 1150 cqhci_writel(cq_host, (cqcfg & ~CQHCI_ENABLE), CQHCI_CFG); 1151 1152 sdhci_cqe_enable(mmc); 1153 1154 if (cqcfg & CQHCI_ENABLE) 1155 cqhci_writel(cq_host, cqcfg, CQHCI_CFG); 1156 } 1157 1158 static void sdhci_tegra_dumpregs(struct mmc_host *mmc) 1159 { 1160 sdhci_dumpregs(mmc_priv(mmc)); 1161 } 1162 1163 static u32 sdhci_tegra_cqhci_irq(struct sdhci_host *host, u32 intmask) 1164 { 1165 int cmd_error = 0; 1166 int data_error = 0; 1167 1168 if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error)) 1169 return intmask; 1170 1171 cqhci_irq(host->mmc, intmask, cmd_error, data_error); 1172 1173 return 0; 1174 } 1175 1176 static const struct cqhci_host_ops sdhci_tegra_cqhci_ops = { 1177 .enable = sdhci_tegra_cqe_enable, 1178 .disable = sdhci_cqe_disable, 1179 .dumpregs = sdhci_tegra_dumpregs, 1180 .update_dcmd_desc = sdhci_tegra_update_dcmd_desc, 1181 }; 1182 1183 static const struct sdhci_ops tegra_sdhci_ops = { 1184 .read_w = tegra_sdhci_readw, 1185 .write_l = tegra_sdhci_writel, 1186 .set_clock = tegra_sdhci_set_clock, 1187 .set_bus_width = sdhci_set_bus_width, 1188 .reset = tegra_sdhci_reset, 1189 .platform_execute_tuning = tegra_sdhci_execute_tuning, 1190 .set_uhs_signaling = tegra_sdhci_set_uhs_signaling, 1191 .voltage_switch = tegra_sdhci_voltage_switch, 1192 .get_max_clock = tegra_sdhci_get_max_clock, 1193 }; 1194 1195 static const struct sdhci_pltfm_data sdhci_tegra20_pdata = { 1196 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | 1197 SDHCI_QUIRK_SINGLE_POWER_WRITE | 1198 SDHCI_QUIRK_NO_HISPD_BIT | 1199 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC | 1200 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, 1201 .ops = &tegra_sdhci_ops, 1202 }; 1203 1204 static const struct sdhci_tegra_soc_data soc_data_tegra20 = { 1205 .pdata = &sdhci_tegra20_pdata, 1206 .nvquirks = NVQUIRK_FORCE_SDHCI_SPEC_200 | 1207 NVQUIRK_ENABLE_BLOCK_GAP_DET, 1208 }; 1209 1210 static const struct sdhci_pltfm_data sdhci_tegra30_pdata = { 1211 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | 1212 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | 1213 SDHCI_QUIRK_SINGLE_POWER_WRITE | 1214 SDHCI_QUIRK_NO_HISPD_BIT | 1215 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC | 1216 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, 1217 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | 1218 SDHCI_QUIRK2_BROKEN_HS200 | 1219 /* 1220 * Auto-CMD23 leads to "Got command interrupt 0x00010000 even 1221 * though no command operation was in progress." 1222 * 1223 * The exact reason is unknown, as the same hardware seems 1224 * to support Auto CMD23 on a downstream 3.1 kernel. 1225 */ 1226 SDHCI_QUIRK2_ACMD23_BROKEN, 1227 .ops = &tegra_sdhci_ops, 1228 }; 1229 1230 static const struct sdhci_tegra_soc_data soc_data_tegra30 = { 1231 .pdata = &sdhci_tegra30_pdata, 1232 .nvquirks = NVQUIRK_ENABLE_SDHCI_SPEC_300 | 1233 NVQUIRK_ENABLE_SDR50 | 1234 NVQUIRK_ENABLE_SDR104 | 1235 NVQUIRK_HAS_PADCALIB, 1236 }; 1237 1238 static const struct sdhci_ops tegra114_sdhci_ops = { 1239 .read_w = tegra_sdhci_readw, 1240 .write_w = tegra_sdhci_writew, 1241 .write_l = tegra_sdhci_writel, 1242 .set_clock = tegra_sdhci_set_clock, 1243 .set_bus_width = sdhci_set_bus_width, 1244 .reset = tegra_sdhci_reset, 1245 .platform_execute_tuning = tegra_sdhci_execute_tuning, 1246 .set_uhs_signaling = tegra_sdhci_set_uhs_signaling, 1247 .voltage_switch = tegra_sdhci_voltage_switch, 1248 .get_max_clock = tegra_sdhci_get_max_clock, 1249 }; 1250 1251 static const struct sdhci_pltfm_data sdhci_tegra114_pdata = { 1252 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | 1253 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | 1254 SDHCI_QUIRK_SINGLE_POWER_WRITE | 1255 SDHCI_QUIRK_NO_HISPD_BIT | 1256 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC | 1257 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, 1258 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN, 1259 .ops = &tegra114_sdhci_ops, 1260 }; 1261 1262 static const struct sdhci_tegra_soc_data soc_data_tegra114 = { 1263 .pdata = &sdhci_tegra114_pdata, 1264 }; 1265 1266 static const struct sdhci_pltfm_data sdhci_tegra124_pdata = { 1267 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | 1268 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | 1269 SDHCI_QUIRK_SINGLE_POWER_WRITE | 1270 SDHCI_QUIRK_NO_HISPD_BIT | 1271 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC | 1272 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, 1273 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | 1274 /* 1275 * The TRM states that the SD/MMC controller found on 1276 * Tegra124 can address 34 bits (the maximum supported by 1277 * the Tegra memory controller), but tests show that DMA 1278 * to or from above 4 GiB doesn't work. This is possibly 1279 * caused by missing programming, though it's not obvious 1280 * what sequence is required. Mark 64-bit DMA broken for 1281 * now to fix this for existing users (e.g. Nyan boards). 1282 */ 1283 SDHCI_QUIRK2_BROKEN_64_BIT_DMA, 1284 .ops = &tegra114_sdhci_ops, 1285 }; 1286 1287 static const struct sdhci_tegra_soc_data soc_data_tegra124 = { 1288 .pdata = &sdhci_tegra124_pdata, 1289 }; 1290 1291 static const struct sdhci_ops tegra210_sdhci_ops = { 1292 .read_w = tegra_sdhci_readw, 1293 .write_w = tegra210_sdhci_writew, 1294 .write_l = tegra_sdhci_writel, 1295 .set_clock = tegra_sdhci_set_clock, 1296 .set_bus_width = sdhci_set_bus_width, 1297 .reset = tegra_sdhci_reset, 1298 .set_uhs_signaling = tegra_sdhci_set_uhs_signaling, 1299 .voltage_switch = tegra_sdhci_voltage_switch, 1300 .get_max_clock = tegra_sdhci_get_max_clock, 1301 }; 1302 1303 static const struct sdhci_pltfm_data sdhci_tegra210_pdata = { 1304 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | 1305 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | 1306 SDHCI_QUIRK_SINGLE_POWER_WRITE | 1307 SDHCI_QUIRK_NO_HISPD_BIT | 1308 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC | 1309 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, 1310 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN, 1311 .ops = &tegra210_sdhci_ops, 1312 }; 1313 1314 static const struct sdhci_tegra_soc_data soc_data_tegra210 = { 1315 .pdata = &sdhci_tegra210_pdata, 1316 .nvquirks = NVQUIRK_NEEDS_PAD_CONTROL | 1317 NVQUIRK_HAS_PADCALIB | 1318 NVQUIRK_DIS_CARD_CLK_CONFIG_TAP | 1319 NVQUIRK_ENABLE_SDR50 | 1320 NVQUIRK_ENABLE_SDR104, 1321 .min_tap_delay = 106, 1322 .max_tap_delay = 185, 1323 }; 1324 1325 static const struct sdhci_ops tegra186_sdhci_ops = { 1326 .read_w = tegra_sdhci_readw, 1327 .write_l = tegra_sdhci_writel, 1328 .set_clock = tegra_sdhci_set_clock, 1329 .set_bus_width = sdhci_set_bus_width, 1330 .reset = tegra_sdhci_reset, 1331 .set_uhs_signaling = tegra_sdhci_set_uhs_signaling, 1332 .voltage_switch = tegra_sdhci_voltage_switch, 1333 .get_max_clock = tegra_sdhci_get_max_clock, 1334 .irq = sdhci_tegra_cqhci_irq, 1335 }; 1336 1337 static const struct sdhci_pltfm_data sdhci_tegra186_pdata = { 1338 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | 1339 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | 1340 SDHCI_QUIRK_SINGLE_POWER_WRITE | 1341 SDHCI_QUIRK_NO_HISPD_BIT | 1342 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC | 1343 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, 1344 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | 1345 /* SDHCI controllers on Tegra186 support 40-bit addressing. 1346 * IOVA addresses are 48-bit wide on Tegra186. 1347 * With 64-bit dma mask used for SDHCI, accesses can 1348 * be broken. Disable 64-bit dma, which would fall back 1349 * to 32-bit dma mask. Ideally 40-bit dma mask would work, 1350 * But it is not supported as of now. 1351 */ 1352 SDHCI_QUIRK2_BROKEN_64_BIT_DMA, 1353 .ops = &tegra186_sdhci_ops, 1354 }; 1355 1356 static const struct sdhci_tegra_soc_data soc_data_tegra186 = { 1357 .pdata = &sdhci_tegra186_pdata, 1358 .nvquirks = NVQUIRK_NEEDS_PAD_CONTROL | 1359 NVQUIRK_HAS_PADCALIB | 1360 NVQUIRK_DIS_CARD_CLK_CONFIG_TAP | 1361 NVQUIRK_ENABLE_SDR50 | 1362 NVQUIRK_ENABLE_SDR104 | 1363 NVQUIRK_CQHCI_DCMD_R1B_CMD_TIMING, 1364 .min_tap_delay = 84, 1365 .max_tap_delay = 136, 1366 }; 1367 1368 static const struct sdhci_tegra_soc_data soc_data_tegra194 = { 1369 .pdata = &sdhci_tegra186_pdata, 1370 .nvquirks = NVQUIRK_NEEDS_PAD_CONTROL | 1371 NVQUIRK_HAS_PADCALIB | 1372 NVQUIRK_DIS_CARD_CLK_CONFIG_TAP | 1373 NVQUIRK_ENABLE_SDR50 | 1374 NVQUIRK_ENABLE_SDR104, 1375 .min_tap_delay = 96, 1376 .max_tap_delay = 139, 1377 }; 1378 1379 static const struct of_device_id sdhci_tegra_dt_match[] = { 1380 { .compatible = "nvidia,tegra194-sdhci", .data = &soc_data_tegra194 }, 1381 { .compatible = "nvidia,tegra186-sdhci", .data = &soc_data_tegra186 }, 1382 { .compatible = "nvidia,tegra210-sdhci", .data = &soc_data_tegra210 }, 1383 { .compatible = "nvidia,tegra124-sdhci", .data = &soc_data_tegra124 }, 1384 { .compatible = "nvidia,tegra114-sdhci", .data = &soc_data_tegra114 }, 1385 { .compatible = "nvidia,tegra30-sdhci", .data = &soc_data_tegra30 }, 1386 { .compatible = "nvidia,tegra20-sdhci", .data = &soc_data_tegra20 }, 1387 {} 1388 }; 1389 MODULE_DEVICE_TABLE(of, sdhci_tegra_dt_match); 1390 1391 static int sdhci_tegra_add_host(struct sdhci_host *host) 1392 { 1393 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 1394 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 1395 struct cqhci_host *cq_host; 1396 bool dma64; 1397 int ret; 1398 1399 if (!tegra_host->enable_hwcq) 1400 return sdhci_add_host(host); 1401 1402 sdhci_enable_v4_mode(host); 1403 1404 ret = sdhci_setup_host(host); 1405 if (ret) 1406 return ret; 1407 1408 host->mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD; 1409 1410 cq_host = devm_kzalloc(host->mmc->parent, 1411 sizeof(*cq_host), GFP_KERNEL); 1412 if (!cq_host) { 1413 ret = -ENOMEM; 1414 goto cleanup; 1415 } 1416 1417 cq_host->mmio = host->ioaddr + SDHCI_TEGRA_CQE_BASE_ADDR; 1418 cq_host->ops = &sdhci_tegra_cqhci_ops; 1419 1420 dma64 = host->flags & SDHCI_USE_64_BIT_DMA; 1421 if (dma64) 1422 cq_host->caps |= CQHCI_TASK_DESC_SZ_128; 1423 1424 ret = cqhci_init(cq_host, host->mmc, dma64); 1425 if (ret) 1426 goto cleanup; 1427 1428 ret = __sdhci_add_host(host); 1429 if (ret) 1430 goto cleanup; 1431 1432 return 0; 1433 1434 cleanup: 1435 sdhci_cleanup_host(host); 1436 return ret; 1437 } 1438 1439 static int sdhci_tegra_probe(struct platform_device *pdev) 1440 { 1441 const struct of_device_id *match; 1442 const struct sdhci_tegra_soc_data *soc_data; 1443 struct sdhci_host *host; 1444 struct sdhci_pltfm_host *pltfm_host; 1445 struct sdhci_tegra *tegra_host; 1446 struct clk *clk; 1447 int rc; 1448 1449 match = of_match_device(sdhci_tegra_dt_match, &pdev->dev); 1450 if (!match) 1451 return -EINVAL; 1452 soc_data = match->data; 1453 1454 host = sdhci_pltfm_init(pdev, soc_data->pdata, sizeof(*tegra_host)); 1455 if (IS_ERR(host)) 1456 return PTR_ERR(host); 1457 pltfm_host = sdhci_priv(host); 1458 1459 tegra_host = sdhci_pltfm_priv(pltfm_host); 1460 tegra_host->ddr_signaling = false; 1461 tegra_host->pad_calib_required = false; 1462 tegra_host->pad_control_available = false; 1463 tegra_host->soc_data = soc_data; 1464 1465 if (soc_data->nvquirks & NVQUIRK_NEEDS_PAD_CONTROL) { 1466 rc = tegra_sdhci_init_pinctrl_info(&pdev->dev, tegra_host); 1467 if (rc == 0) 1468 host->mmc_host_ops.start_signal_voltage_switch = 1469 sdhci_tegra_start_signal_voltage_switch; 1470 } 1471 1472 /* Hook to periodically rerun pad calibration */ 1473 if (soc_data->nvquirks & NVQUIRK_HAS_PADCALIB) 1474 host->mmc_host_ops.request = tegra_sdhci_request; 1475 1476 host->mmc_host_ops.hs400_enhanced_strobe = 1477 tegra_sdhci_hs400_enhanced_strobe; 1478 1479 if (!host->ops->platform_execute_tuning) 1480 host->mmc_host_ops.execute_tuning = 1481 tegra_sdhci_execute_hw_tuning; 1482 1483 rc = mmc_of_parse(host->mmc); 1484 if (rc) 1485 goto err_parse_dt; 1486 1487 if (tegra_host->soc_data->nvquirks & NVQUIRK_ENABLE_DDR50) 1488 host->mmc->caps |= MMC_CAP_1_8V_DDR; 1489 1490 tegra_sdhci_parse_dt(host); 1491 1492 tegra_host->power_gpio = devm_gpiod_get_optional(&pdev->dev, "power", 1493 GPIOD_OUT_HIGH); 1494 if (IS_ERR(tegra_host->power_gpio)) { 1495 rc = PTR_ERR(tegra_host->power_gpio); 1496 goto err_power_req; 1497 } 1498 1499 clk = devm_clk_get(mmc_dev(host->mmc), NULL); 1500 if (IS_ERR(clk)) { 1501 dev_err(mmc_dev(host->mmc), "clk err\n"); 1502 rc = PTR_ERR(clk); 1503 goto err_clk_get; 1504 } 1505 clk_prepare_enable(clk); 1506 pltfm_host->clk = clk; 1507 1508 tegra_host->rst = devm_reset_control_get_exclusive(&pdev->dev, 1509 "sdhci"); 1510 if (IS_ERR(tegra_host->rst)) { 1511 rc = PTR_ERR(tegra_host->rst); 1512 dev_err(&pdev->dev, "failed to get reset control: %d\n", rc); 1513 goto err_rst_get; 1514 } 1515 1516 rc = reset_control_assert(tegra_host->rst); 1517 if (rc) 1518 goto err_rst_get; 1519 1520 usleep_range(2000, 4000); 1521 1522 rc = reset_control_deassert(tegra_host->rst); 1523 if (rc) 1524 goto err_rst_get; 1525 1526 usleep_range(2000, 4000); 1527 1528 rc = sdhci_tegra_add_host(host); 1529 if (rc) 1530 goto err_add_host; 1531 1532 return 0; 1533 1534 err_add_host: 1535 reset_control_assert(tegra_host->rst); 1536 err_rst_get: 1537 clk_disable_unprepare(pltfm_host->clk); 1538 err_clk_get: 1539 err_power_req: 1540 err_parse_dt: 1541 sdhci_pltfm_free(pdev); 1542 return rc; 1543 } 1544 1545 static int sdhci_tegra_remove(struct platform_device *pdev) 1546 { 1547 struct sdhci_host *host = platform_get_drvdata(pdev); 1548 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 1549 struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); 1550 1551 sdhci_remove_host(host, 0); 1552 1553 reset_control_assert(tegra_host->rst); 1554 usleep_range(2000, 4000); 1555 clk_disable_unprepare(pltfm_host->clk); 1556 1557 sdhci_pltfm_free(pdev); 1558 1559 return 0; 1560 } 1561 1562 static struct platform_driver sdhci_tegra_driver = { 1563 .driver = { 1564 .name = "sdhci-tegra", 1565 .of_match_table = sdhci_tegra_dt_match, 1566 .pm = &sdhci_pltfm_pmops, 1567 }, 1568 .probe = sdhci_tegra_probe, 1569 .remove = sdhci_tegra_remove, 1570 }; 1571 1572 module_platform_driver(sdhci_tegra_driver); 1573 1574 MODULE_DESCRIPTION("SDHCI driver for Tegra"); 1575 MODULE_AUTHOR("Google, Inc."); 1576 MODULE_LICENSE("GPL v2"); 1577