1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * sdhci_am654.c - SDHCI driver for TI's AM654 SOCs 4 * 5 * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com 6 * 7 */ 8 #include <linux/clk.h> 9 #include <linux/iopoll.h> 10 #include <linux/of.h> 11 #include <linux/module.h> 12 #include <linux/pm_runtime.h> 13 #include <linux/property.h> 14 #include <linux/regmap.h> 15 #include <linux/sys_soc.h> 16 17 #include "cqhci.h" 18 #include "sdhci-cqhci.h" 19 #include "sdhci-pltfm.h" 20 21 /* CTL_CFG Registers */ 22 #define CTL_CFG_2 0x14 23 #define CTL_CFG_3 0x18 24 25 #define SLOTTYPE_MASK GENMASK(31, 30) 26 #define SLOTTYPE_EMBEDDED BIT(30) 27 #define TUNINGFORSDR50_MASK BIT(13) 28 29 /* PHY Registers */ 30 #define PHY_CTRL1 0x100 31 #define PHY_CTRL2 0x104 32 #define PHY_CTRL3 0x108 33 #define PHY_CTRL4 0x10C 34 #define PHY_CTRL5 0x110 35 #define PHY_CTRL6 0x114 36 #define PHY_STAT1 0x130 37 #define PHY_STAT2 0x134 38 39 #define IOMUX_ENABLE_SHIFT 31 40 #define IOMUX_ENABLE_MASK BIT(IOMUX_ENABLE_SHIFT) 41 #define OTAPDLYENA_SHIFT 20 42 #define OTAPDLYENA_MASK BIT(OTAPDLYENA_SHIFT) 43 #define OTAPDLYSEL_SHIFT 12 44 #define OTAPDLYSEL_MASK GENMASK(15, 12) 45 #define STRBSEL_SHIFT 24 46 #define STRBSEL_4BIT_MASK GENMASK(27, 24) 47 #define STRBSEL_8BIT_MASK GENMASK(31, 24) 48 #define SEL50_SHIFT 8 49 #define SEL50_MASK BIT(SEL50_SHIFT) 50 #define SEL100_SHIFT 9 51 #define SEL100_MASK BIT(SEL100_SHIFT) 52 #define FREQSEL_SHIFT 8 53 #define FREQSEL_MASK GENMASK(10, 8) 54 #define CLKBUFSEL_SHIFT 0 55 #define CLKBUFSEL_MASK GENMASK(2, 0) 56 #define DLL_TRIM_ICP_SHIFT 4 57 #define DLL_TRIM_ICP_MASK GENMASK(7, 4) 58 #define DR_TY_SHIFT 20 59 #define DR_TY_MASK GENMASK(22, 20) 60 #define ENDLL_SHIFT 1 61 #define ENDLL_MASK BIT(ENDLL_SHIFT) 62 #define DLLRDY_SHIFT 0 63 #define DLLRDY_MASK BIT(DLLRDY_SHIFT) 64 #define PDB_SHIFT 0 65 #define PDB_MASK BIT(PDB_SHIFT) 66 #define CALDONE_SHIFT 1 67 #define CALDONE_MASK BIT(CALDONE_SHIFT) 68 #define RETRIM_SHIFT 17 69 #define RETRIM_MASK BIT(RETRIM_SHIFT) 70 #define SELDLYTXCLK_SHIFT 17 71 #define SELDLYTXCLK_MASK BIT(SELDLYTXCLK_SHIFT) 72 #define SELDLYRXCLK_SHIFT 16 73 #define SELDLYRXCLK_MASK BIT(SELDLYRXCLK_SHIFT) 74 #define ITAPDLYSEL_SHIFT 0 75 #define ITAPDLYSEL_MASK GENMASK(4, 0) 76 #define ITAPDLYENA_SHIFT 8 77 #define ITAPDLYENA_MASK BIT(ITAPDLYENA_SHIFT) 78 #define ITAPCHGWIN_SHIFT 9 79 #define ITAPCHGWIN_MASK BIT(ITAPCHGWIN_SHIFT) 80 81 #define DRIVER_STRENGTH_50_OHM 0x0 82 #define DRIVER_STRENGTH_33_OHM 0x1 83 #define DRIVER_STRENGTH_66_OHM 0x2 84 #define DRIVER_STRENGTH_100_OHM 0x3 85 #define DRIVER_STRENGTH_40_OHM 0x4 86 87 #define CLOCK_TOO_SLOW_HZ 50000000 88 #define SDHCI_AM654_AUTOSUSPEND_DELAY -1 89 90 /* Command Queue Host Controller Interface Base address */ 91 #define SDHCI_AM654_CQE_BASE_ADDR 0x200 92 93 static struct regmap_config sdhci_am654_regmap_config = { 94 .reg_bits = 32, 95 .val_bits = 32, 96 .reg_stride = 4, 97 .fast_io = true, 98 }; 99 100 struct timing_data { 101 const char *otap_binding; 102 const char *itap_binding; 103 u32 capability; 104 }; 105 106 static const struct timing_data td[] = { 107 [MMC_TIMING_LEGACY] = {"ti,otap-del-sel-legacy", 108 "ti,itap-del-sel-legacy", 109 0}, 110 [MMC_TIMING_MMC_HS] = {"ti,otap-del-sel-mmc-hs", 111 "ti,itap-del-sel-mmc-hs", 112 MMC_CAP_MMC_HIGHSPEED}, 113 [MMC_TIMING_SD_HS] = {"ti,otap-del-sel-sd-hs", 114 "ti,itap-del-sel-sd-hs", 115 MMC_CAP_SD_HIGHSPEED}, 116 [MMC_TIMING_UHS_SDR12] = {"ti,otap-del-sel-sdr12", 117 "ti,itap-del-sel-sdr12", 118 MMC_CAP_UHS_SDR12}, 119 [MMC_TIMING_UHS_SDR25] = {"ti,otap-del-sel-sdr25", 120 "ti,itap-del-sel-sdr25", 121 MMC_CAP_UHS_SDR25}, 122 [MMC_TIMING_UHS_SDR50] = {"ti,otap-del-sel-sdr50", 123 NULL, 124 MMC_CAP_UHS_SDR50}, 125 [MMC_TIMING_UHS_SDR104] = {"ti,otap-del-sel-sdr104", 126 NULL, 127 MMC_CAP_UHS_SDR104}, 128 [MMC_TIMING_UHS_DDR50] = {"ti,otap-del-sel-ddr50", 129 NULL, 130 MMC_CAP_UHS_DDR50}, 131 [MMC_TIMING_MMC_DDR52] = {"ti,otap-del-sel-ddr52", 132 "ti,itap-del-sel-ddr52", 133 MMC_CAP_DDR}, 134 [MMC_TIMING_MMC_HS200] = {"ti,otap-del-sel-hs200", 135 NULL, 136 MMC_CAP2_HS200}, 137 [MMC_TIMING_MMC_HS400] = {"ti,otap-del-sel-hs400", 138 NULL, 139 MMC_CAP2_HS400}, 140 }; 141 142 struct sdhci_am654_data { 143 struct regmap *base; 144 bool legacy_otapdly; 145 int otap_del_sel[ARRAY_SIZE(td)]; 146 int itap_del_sel[ARRAY_SIZE(td)]; 147 int clkbuf_sel; 148 int trm_icp; 149 int drv_strength; 150 int strb_sel; 151 u32 flags; 152 u32 quirks; 153 154 #define SDHCI_AM654_QUIRK_FORCE_CDTEST BIT(0) 155 }; 156 157 struct sdhci_am654_driver_data { 158 const struct sdhci_pltfm_data *pdata; 159 u32 flags; 160 #define IOMUX_PRESENT (1 << 0) 161 #define FREQSEL_2_BIT (1 << 1) 162 #define STRBSEL_4_BIT (1 << 2) 163 #define DLL_PRESENT (1 << 3) 164 #define DLL_CALIB (1 << 4) 165 }; 166 167 static void sdhci_am654_setup_dll(struct sdhci_host *host, unsigned int clock) 168 { 169 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 170 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 171 int sel50, sel100, freqsel; 172 u32 mask, val; 173 int ret; 174 175 /* Disable delay chain mode */ 176 regmap_update_bits(sdhci_am654->base, PHY_CTRL5, 177 SELDLYTXCLK_MASK | SELDLYRXCLK_MASK, 0); 178 179 if (sdhci_am654->flags & FREQSEL_2_BIT) { 180 switch (clock) { 181 case 200000000: 182 sel50 = 0; 183 sel100 = 0; 184 break; 185 case 100000000: 186 sel50 = 0; 187 sel100 = 1; 188 break; 189 default: 190 sel50 = 1; 191 sel100 = 0; 192 } 193 194 /* Configure PHY DLL frequency */ 195 mask = SEL50_MASK | SEL100_MASK; 196 val = (sel50 << SEL50_SHIFT) | (sel100 << SEL100_SHIFT); 197 regmap_update_bits(sdhci_am654->base, PHY_CTRL5, mask, val); 198 199 } else { 200 switch (clock) { 201 case 200000000: 202 freqsel = 0x0; 203 break; 204 default: 205 freqsel = 0x4; 206 } 207 208 regmap_update_bits(sdhci_am654->base, PHY_CTRL5, FREQSEL_MASK, 209 freqsel << FREQSEL_SHIFT); 210 } 211 /* Configure DLL TRIM */ 212 mask = DLL_TRIM_ICP_MASK; 213 val = sdhci_am654->trm_icp << DLL_TRIM_ICP_SHIFT; 214 215 /* Configure DLL driver strength */ 216 mask |= DR_TY_MASK; 217 val |= sdhci_am654->drv_strength << DR_TY_SHIFT; 218 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, mask, val); 219 220 /* Enable DLL */ 221 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, ENDLL_MASK, 222 0x1 << ENDLL_SHIFT); 223 /* 224 * Poll for DLL ready. Use a one second timeout. 225 * Works in all experiments done so far 226 */ 227 ret = regmap_read_poll_timeout(sdhci_am654->base, PHY_STAT1, val, 228 val & DLLRDY_MASK, 1000, 1000000); 229 if (ret) { 230 dev_err(mmc_dev(host->mmc), "DLL failed to relock\n"); 231 return; 232 } 233 } 234 235 static void sdhci_am654_write_itapdly(struct sdhci_am654_data *sdhci_am654, 236 u32 itapdly) 237 { 238 /* Set ITAPCHGWIN before writing to ITAPDLY */ 239 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPCHGWIN_MASK, 240 1 << ITAPCHGWIN_SHIFT); 241 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPDLYSEL_MASK, 242 itapdly << ITAPDLYSEL_SHIFT); 243 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPCHGWIN_MASK, 0); 244 } 245 246 static void sdhci_am654_setup_delay_chain(struct sdhci_am654_data *sdhci_am654, 247 unsigned char timing) 248 { 249 u32 mask, val; 250 251 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, ENDLL_MASK, 0); 252 253 val = 1 << SELDLYTXCLK_SHIFT | 1 << SELDLYRXCLK_SHIFT; 254 mask = SELDLYTXCLK_MASK | SELDLYRXCLK_MASK; 255 regmap_update_bits(sdhci_am654->base, PHY_CTRL5, mask, val); 256 257 sdhci_am654_write_itapdly(sdhci_am654, 258 sdhci_am654->itap_del_sel[timing]); 259 } 260 261 static void sdhci_am654_set_clock(struct sdhci_host *host, unsigned int clock) 262 { 263 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 264 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 265 unsigned char timing = host->mmc->ios.timing; 266 u32 otap_del_sel; 267 u32 otap_del_ena; 268 u32 mask, val; 269 270 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, ENDLL_MASK, 0); 271 272 sdhci_set_clock(host, clock); 273 274 /* Setup DLL Output TAP delay */ 275 if (sdhci_am654->legacy_otapdly) 276 otap_del_sel = sdhci_am654->otap_del_sel[0]; 277 else 278 otap_del_sel = sdhci_am654->otap_del_sel[timing]; 279 280 otap_del_ena = (timing > MMC_TIMING_UHS_SDR25) ? 1 : 0; 281 282 mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK; 283 val = (otap_del_ena << OTAPDLYENA_SHIFT) | 284 (otap_del_sel << OTAPDLYSEL_SHIFT); 285 286 /* Write to STRBSEL for HS400 speed mode */ 287 if (timing == MMC_TIMING_MMC_HS400) { 288 if (sdhci_am654->flags & STRBSEL_4_BIT) 289 mask |= STRBSEL_4BIT_MASK; 290 else 291 mask |= STRBSEL_8BIT_MASK; 292 293 val |= sdhci_am654->strb_sel << STRBSEL_SHIFT; 294 } 295 296 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val); 297 298 if (timing > MMC_TIMING_UHS_SDR25 && clock >= CLOCK_TOO_SLOW_HZ) 299 sdhci_am654_setup_dll(host, clock); 300 else 301 sdhci_am654_setup_delay_chain(sdhci_am654, timing); 302 303 regmap_update_bits(sdhci_am654->base, PHY_CTRL5, CLKBUFSEL_MASK, 304 sdhci_am654->clkbuf_sel); 305 } 306 307 static void sdhci_j721e_4bit_set_clock(struct sdhci_host *host, 308 unsigned int clock) 309 { 310 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 311 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 312 unsigned char timing = host->mmc->ios.timing; 313 u32 otap_del_sel; 314 u32 mask, val; 315 316 /* Setup DLL Output TAP delay */ 317 if (sdhci_am654->legacy_otapdly) 318 otap_del_sel = sdhci_am654->otap_del_sel[0]; 319 else 320 otap_del_sel = sdhci_am654->otap_del_sel[timing]; 321 322 mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK; 323 val = (0x1 << OTAPDLYENA_SHIFT) | 324 (otap_del_sel << OTAPDLYSEL_SHIFT); 325 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val); 326 327 regmap_update_bits(sdhci_am654->base, PHY_CTRL5, CLKBUFSEL_MASK, 328 sdhci_am654->clkbuf_sel); 329 330 sdhci_set_clock(host, clock); 331 } 332 333 static u8 sdhci_am654_write_power_on(struct sdhci_host *host, u8 val, int reg) 334 { 335 writeb(val, host->ioaddr + reg); 336 usleep_range(1000, 10000); 337 return readb(host->ioaddr + reg); 338 } 339 340 #define MAX_POWER_ON_TIMEOUT 1500000 /* us */ 341 static void sdhci_am654_write_b(struct sdhci_host *host, u8 val, int reg) 342 { 343 unsigned char timing = host->mmc->ios.timing; 344 u8 pwr; 345 int ret; 346 347 if (reg == SDHCI_HOST_CONTROL) { 348 switch (timing) { 349 /* 350 * According to the data manual, HISPD bit 351 * should not be set in these speed modes. 352 */ 353 case MMC_TIMING_SD_HS: 354 case MMC_TIMING_MMC_HS: 355 val &= ~SDHCI_CTRL_HISPD; 356 } 357 } 358 359 writeb(val, host->ioaddr + reg); 360 if (reg == SDHCI_POWER_CONTROL && (val & SDHCI_POWER_ON)) { 361 /* 362 * Power on will not happen until the card detect debounce 363 * timer expires. Wait at least 1.5 seconds for the power on 364 * bit to be set 365 */ 366 ret = read_poll_timeout(sdhci_am654_write_power_on, pwr, 367 pwr & SDHCI_POWER_ON, 0, 368 MAX_POWER_ON_TIMEOUT, false, host, val, 369 reg); 370 if (ret) 371 dev_info(mmc_dev(host->mmc), "Power on failed\n"); 372 } 373 } 374 375 static void sdhci_am654_reset(struct sdhci_host *host, u8 mask) 376 { 377 u8 ctrl; 378 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 379 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 380 381 sdhci_and_cqhci_reset(host, mask); 382 383 if (sdhci_am654->quirks & SDHCI_AM654_QUIRK_FORCE_CDTEST) { 384 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 385 ctrl |= SDHCI_CTRL_CDTEST_INS | SDHCI_CTRL_CDTEST_EN; 386 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 387 } 388 } 389 390 static int sdhci_am654_execute_tuning(struct mmc_host *mmc, u32 opcode) 391 { 392 struct sdhci_host *host = mmc_priv(mmc); 393 int err = sdhci_execute_tuning(mmc, opcode); 394 395 if (err) 396 return err; 397 /* 398 * Tuning data remains in the buffer after tuning. 399 * Do a command and data reset to get rid of it 400 */ 401 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); 402 403 return 0; 404 } 405 406 static u32 sdhci_am654_cqhci_irq(struct sdhci_host *host, u32 intmask) 407 { 408 int cmd_error = 0; 409 int data_error = 0; 410 411 if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error)) 412 return intmask; 413 414 cqhci_irq(host->mmc, intmask, cmd_error, data_error); 415 416 return 0; 417 } 418 419 #define ITAP_MAX 32 420 static int sdhci_am654_platform_execute_tuning(struct sdhci_host *host, 421 u32 opcode) 422 { 423 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 424 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 425 int cur_val, prev_val = 1, fail_len = 0, pass_window = 0, pass_len; 426 u32 itap; 427 428 /* Enable ITAPDLY */ 429 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPDLYENA_MASK, 430 1 << ITAPDLYENA_SHIFT); 431 432 for (itap = 0; itap < ITAP_MAX; itap++) { 433 sdhci_am654_write_itapdly(sdhci_am654, itap); 434 435 cur_val = !mmc_send_tuning(host->mmc, opcode, NULL); 436 if (cur_val && !prev_val) 437 pass_window = itap; 438 439 if (!cur_val) 440 fail_len++; 441 442 prev_val = cur_val; 443 } 444 /* 445 * Having determined the length of the failing window and start of 446 * the passing window calculate the length of the passing window and 447 * set the final value halfway through it considering the range as a 448 * circular buffer 449 */ 450 pass_len = ITAP_MAX - fail_len; 451 itap = (pass_window + (pass_len >> 1)) % ITAP_MAX; 452 sdhci_am654_write_itapdly(sdhci_am654, itap); 453 454 return 0; 455 } 456 457 static struct sdhci_ops sdhci_am654_ops = { 458 .platform_execute_tuning = sdhci_am654_platform_execute_tuning, 459 .get_max_clock = sdhci_pltfm_clk_get_max_clock, 460 .get_timeout_clock = sdhci_pltfm_clk_get_max_clock, 461 .set_uhs_signaling = sdhci_set_uhs_signaling, 462 .set_bus_width = sdhci_set_bus_width, 463 .set_power = sdhci_set_power_and_bus_voltage, 464 .set_clock = sdhci_am654_set_clock, 465 .write_b = sdhci_am654_write_b, 466 .irq = sdhci_am654_cqhci_irq, 467 .reset = sdhci_and_cqhci_reset, 468 }; 469 470 static const struct sdhci_pltfm_data sdhci_am654_pdata = { 471 .ops = &sdhci_am654_ops, 472 .quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12, 473 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN, 474 }; 475 476 static const struct sdhci_am654_driver_data sdhci_am654_sr1_drvdata = { 477 .pdata = &sdhci_am654_pdata, 478 .flags = IOMUX_PRESENT | FREQSEL_2_BIT | STRBSEL_4_BIT | DLL_PRESENT | 479 DLL_CALIB, 480 }; 481 482 static const struct sdhci_am654_driver_data sdhci_am654_drvdata = { 483 .pdata = &sdhci_am654_pdata, 484 .flags = IOMUX_PRESENT | FREQSEL_2_BIT | STRBSEL_4_BIT | DLL_PRESENT, 485 }; 486 487 static struct sdhci_ops sdhci_j721e_8bit_ops = { 488 .platform_execute_tuning = sdhci_am654_platform_execute_tuning, 489 .get_max_clock = sdhci_pltfm_clk_get_max_clock, 490 .get_timeout_clock = sdhci_pltfm_clk_get_max_clock, 491 .set_uhs_signaling = sdhci_set_uhs_signaling, 492 .set_bus_width = sdhci_set_bus_width, 493 .set_power = sdhci_set_power_and_bus_voltage, 494 .set_clock = sdhci_am654_set_clock, 495 .write_b = sdhci_am654_write_b, 496 .irq = sdhci_am654_cqhci_irq, 497 .reset = sdhci_and_cqhci_reset, 498 }; 499 500 static const struct sdhci_pltfm_data sdhci_j721e_8bit_pdata = { 501 .ops = &sdhci_j721e_8bit_ops, 502 .quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12, 503 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN, 504 }; 505 506 static const struct sdhci_am654_driver_data sdhci_j721e_8bit_drvdata = { 507 .pdata = &sdhci_j721e_8bit_pdata, 508 .flags = DLL_PRESENT | DLL_CALIB, 509 }; 510 511 static struct sdhci_ops sdhci_j721e_4bit_ops = { 512 .platform_execute_tuning = sdhci_am654_platform_execute_tuning, 513 .get_max_clock = sdhci_pltfm_clk_get_max_clock, 514 .get_timeout_clock = sdhci_pltfm_clk_get_max_clock, 515 .set_uhs_signaling = sdhci_set_uhs_signaling, 516 .set_bus_width = sdhci_set_bus_width, 517 .set_power = sdhci_set_power_and_bus_voltage, 518 .set_clock = sdhci_j721e_4bit_set_clock, 519 .write_b = sdhci_am654_write_b, 520 .irq = sdhci_am654_cqhci_irq, 521 .reset = sdhci_am654_reset, 522 }; 523 524 static const struct sdhci_pltfm_data sdhci_j721e_4bit_pdata = { 525 .ops = &sdhci_j721e_4bit_ops, 526 .quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12, 527 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN, 528 }; 529 530 static const struct sdhci_am654_driver_data sdhci_j721e_4bit_drvdata = { 531 .pdata = &sdhci_j721e_4bit_pdata, 532 .flags = IOMUX_PRESENT, 533 }; 534 535 static const struct soc_device_attribute sdhci_am654_devices[] = { 536 { .family = "AM65X", 537 .revision = "SR1.0", 538 .data = &sdhci_am654_sr1_drvdata 539 }, 540 {/* sentinel */} 541 }; 542 543 static void sdhci_am654_dumpregs(struct mmc_host *mmc) 544 { 545 sdhci_dumpregs(mmc_priv(mmc)); 546 } 547 548 static const struct cqhci_host_ops sdhci_am654_cqhci_ops = { 549 .enable = sdhci_cqe_enable, 550 .disable = sdhci_cqe_disable, 551 .dumpregs = sdhci_am654_dumpregs, 552 }; 553 554 static int sdhci_am654_cqe_add_host(struct sdhci_host *host) 555 { 556 struct cqhci_host *cq_host; 557 558 cq_host = devm_kzalloc(mmc_dev(host->mmc), sizeof(struct cqhci_host), 559 GFP_KERNEL); 560 if (!cq_host) 561 return -ENOMEM; 562 563 cq_host->mmio = host->ioaddr + SDHCI_AM654_CQE_BASE_ADDR; 564 cq_host->quirks |= CQHCI_QUIRK_SHORT_TXFR_DESC_SZ; 565 cq_host->caps |= CQHCI_TASK_DESC_SZ_128; 566 cq_host->ops = &sdhci_am654_cqhci_ops; 567 568 host->mmc->caps2 |= MMC_CAP2_CQE; 569 570 return cqhci_init(cq_host, host->mmc, 1); 571 } 572 573 static int sdhci_am654_get_otap_delay(struct sdhci_host *host, 574 struct sdhci_am654_data *sdhci_am654) 575 { 576 struct device *dev = mmc_dev(host->mmc); 577 int i; 578 int ret; 579 580 ret = device_property_read_u32(dev, td[MMC_TIMING_LEGACY].otap_binding, 581 &sdhci_am654->otap_del_sel[MMC_TIMING_LEGACY]); 582 if (ret) { 583 /* 584 * ti,otap-del-sel-legacy is mandatory, look for old binding 585 * if not found. 586 */ 587 ret = device_property_read_u32(dev, "ti,otap-del-sel", 588 &sdhci_am654->otap_del_sel[0]); 589 if (ret) { 590 dev_err(dev, "Couldn't find otap-del-sel\n"); 591 592 return ret; 593 } 594 595 dev_info(dev, "Using legacy binding ti,otap-del-sel\n"); 596 sdhci_am654->legacy_otapdly = true; 597 598 return 0; 599 } 600 601 for (i = MMC_TIMING_MMC_HS; i <= MMC_TIMING_MMC_HS400; i++) { 602 603 ret = device_property_read_u32(dev, td[i].otap_binding, 604 &sdhci_am654->otap_del_sel[i]); 605 if (ret) { 606 dev_dbg(dev, "Couldn't find %s\n", 607 td[i].otap_binding); 608 /* 609 * Remove the corresponding capability 610 * if an otap-del-sel value is not found 611 */ 612 if (i <= MMC_TIMING_MMC_DDR52) 613 host->mmc->caps &= ~td[i].capability; 614 else 615 host->mmc->caps2 &= ~td[i].capability; 616 } 617 618 if (td[i].itap_binding) 619 device_property_read_u32(dev, td[i].itap_binding, 620 &sdhci_am654->itap_del_sel[i]); 621 } 622 623 return 0; 624 } 625 626 static int sdhci_am654_init(struct sdhci_host *host) 627 { 628 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 629 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 630 u32 ctl_cfg_2 = 0; 631 u32 mask; 632 u32 val; 633 int ret; 634 635 /* Reset OTAP to default value */ 636 mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK; 637 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, 0x0); 638 639 if (sdhci_am654->flags & DLL_CALIB) { 640 regmap_read(sdhci_am654->base, PHY_STAT1, &val); 641 if (~val & CALDONE_MASK) { 642 /* Calibrate IO lines */ 643 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, 644 PDB_MASK, PDB_MASK); 645 ret = regmap_read_poll_timeout(sdhci_am654->base, 646 PHY_STAT1, val, 647 val & CALDONE_MASK, 648 1, 20); 649 if (ret) 650 return ret; 651 } 652 } 653 654 /* Enable pins by setting IO mux to 0 */ 655 if (sdhci_am654->flags & IOMUX_PRESENT) 656 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, 657 IOMUX_ENABLE_MASK, 0); 658 659 /* Set slot type based on SD or eMMC */ 660 if (host->mmc->caps & MMC_CAP_NONREMOVABLE) 661 ctl_cfg_2 = SLOTTYPE_EMBEDDED; 662 663 regmap_update_bits(sdhci_am654->base, CTL_CFG_2, SLOTTYPE_MASK, 664 ctl_cfg_2); 665 666 /* Enable tuning for SDR50 */ 667 regmap_update_bits(sdhci_am654->base, CTL_CFG_3, TUNINGFORSDR50_MASK, 668 TUNINGFORSDR50_MASK); 669 670 ret = sdhci_setup_host(host); 671 if (ret) 672 return ret; 673 674 ret = sdhci_am654_cqe_add_host(host); 675 if (ret) 676 goto err_cleanup_host; 677 678 ret = sdhci_am654_get_otap_delay(host, sdhci_am654); 679 if (ret) 680 goto err_cleanup_host; 681 682 ret = __sdhci_add_host(host); 683 if (ret) 684 goto err_cleanup_host; 685 686 return 0; 687 688 err_cleanup_host: 689 sdhci_cleanup_host(host); 690 return ret; 691 } 692 693 static int sdhci_am654_get_of_property(struct platform_device *pdev, 694 struct sdhci_am654_data *sdhci_am654) 695 { 696 struct device *dev = &pdev->dev; 697 int drv_strength; 698 int ret; 699 700 if (sdhci_am654->flags & DLL_PRESENT) { 701 ret = device_property_read_u32(dev, "ti,trm-icp", 702 &sdhci_am654->trm_icp); 703 if (ret) 704 return ret; 705 706 ret = device_property_read_u32(dev, "ti,driver-strength-ohm", 707 &drv_strength); 708 if (ret) 709 return ret; 710 711 switch (drv_strength) { 712 case 50: 713 sdhci_am654->drv_strength = DRIVER_STRENGTH_50_OHM; 714 break; 715 case 33: 716 sdhci_am654->drv_strength = DRIVER_STRENGTH_33_OHM; 717 break; 718 case 66: 719 sdhci_am654->drv_strength = DRIVER_STRENGTH_66_OHM; 720 break; 721 case 100: 722 sdhci_am654->drv_strength = DRIVER_STRENGTH_100_OHM; 723 break; 724 case 40: 725 sdhci_am654->drv_strength = DRIVER_STRENGTH_40_OHM; 726 break; 727 default: 728 dev_err(dev, "Invalid driver strength\n"); 729 return -EINVAL; 730 } 731 } 732 733 device_property_read_u32(dev, "ti,strobe-sel", &sdhci_am654->strb_sel); 734 device_property_read_u32(dev, "ti,clkbuf-sel", 735 &sdhci_am654->clkbuf_sel); 736 737 if (device_property_read_bool(dev, "ti,fails-without-test-cd")) 738 sdhci_am654->quirks |= SDHCI_AM654_QUIRK_FORCE_CDTEST; 739 740 sdhci_get_of_property(pdev); 741 742 return 0; 743 } 744 745 static const struct of_device_id sdhci_am654_of_match[] = { 746 { 747 .compatible = "ti,am654-sdhci-5.1", 748 .data = &sdhci_am654_drvdata, 749 }, 750 { 751 .compatible = "ti,j721e-sdhci-8bit", 752 .data = &sdhci_j721e_8bit_drvdata, 753 }, 754 { 755 .compatible = "ti,j721e-sdhci-4bit", 756 .data = &sdhci_j721e_4bit_drvdata, 757 }, 758 { 759 .compatible = "ti,am64-sdhci-8bit", 760 .data = &sdhci_j721e_8bit_drvdata, 761 }, 762 { 763 .compatible = "ti,am64-sdhci-4bit", 764 .data = &sdhci_j721e_4bit_drvdata, 765 }, 766 { 767 .compatible = "ti,am62-sdhci", 768 .data = &sdhci_j721e_4bit_drvdata, 769 }, 770 { /* sentinel */ } 771 }; 772 MODULE_DEVICE_TABLE(of, sdhci_am654_of_match); 773 774 static int sdhci_am654_probe(struct platform_device *pdev) 775 { 776 const struct sdhci_am654_driver_data *drvdata; 777 const struct soc_device_attribute *soc; 778 struct sdhci_pltfm_host *pltfm_host; 779 struct sdhci_am654_data *sdhci_am654; 780 const struct of_device_id *match; 781 struct sdhci_host *host; 782 struct clk *clk_xin; 783 struct device *dev = &pdev->dev; 784 void __iomem *base; 785 int ret; 786 787 match = of_match_node(sdhci_am654_of_match, pdev->dev.of_node); 788 drvdata = match->data; 789 790 /* Update drvdata based on SoC revision */ 791 soc = soc_device_match(sdhci_am654_devices); 792 if (soc && soc->data) 793 drvdata = soc->data; 794 795 host = sdhci_pltfm_init(pdev, drvdata->pdata, sizeof(*sdhci_am654)); 796 if (IS_ERR(host)) 797 return PTR_ERR(host); 798 799 pltfm_host = sdhci_priv(host); 800 sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 801 sdhci_am654->flags = drvdata->flags; 802 803 clk_xin = devm_clk_get(dev, "clk_xin"); 804 if (IS_ERR(clk_xin)) { 805 dev_err(dev, "clk_xin clock not found.\n"); 806 ret = PTR_ERR(clk_xin); 807 goto err_pltfm_free; 808 } 809 810 pltfm_host->clk = clk_xin; 811 812 base = devm_platform_ioremap_resource(pdev, 1); 813 if (IS_ERR(base)) { 814 ret = PTR_ERR(base); 815 goto err_pltfm_free; 816 } 817 818 sdhci_am654->base = devm_regmap_init_mmio(dev, base, 819 &sdhci_am654_regmap_config); 820 if (IS_ERR(sdhci_am654->base)) { 821 dev_err(dev, "Failed to initialize regmap\n"); 822 ret = PTR_ERR(sdhci_am654->base); 823 goto err_pltfm_free; 824 } 825 826 ret = sdhci_am654_get_of_property(pdev, sdhci_am654); 827 if (ret) 828 goto err_pltfm_free; 829 830 ret = mmc_of_parse(host->mmc); 831 if (ret) { 832 dev_err_probe(dev, ret, "parsing dt failed\n"); 833 goto err_pltfm_free; 834 } 835 836 host->mmc_host_ops.execute_tuning = sdhci_am654_execute_tuning; 837 838 pm_runtime_get_noresume(dev); 839 ret = pm_runtime_set_active(dev); 840 if (ret) 841 goto pm_put; 842 pm_runtime_enable(dev); 843 ret = clk_prepare_enable(pltfm_host->clk); 844 if (ret) 845 goto pm_disable; 846 847 ret = sdhci_am654_init(host); 848 if (ret) 849 goto clk_disable; 850 851 /* Setting up autosuspend */ 852 pm_runtime_set_autosuspend_delay(dev, SDHCI_AM654_AUTOSUSPEND_DELAY); 853 pm_runtime_use_autosuspend(dev); 854 pm_runtime_mark_last_busy(dev); 855 pm_runtime_put_autosuspend(dev); 856 return 0; 857 858 clk_disable: 859 clk_disable_unprepare(pltfm_host->clk); 860 pm_disable: 861 pm_runtime_disable(dev); 862 pm_put: 863 pm_runtime_put_noidle(dev); 864 err_pltfm_free: 865 sdhci_pltfm_free(pdev); 866 return ret; 867 } 868 869 static void sdhci_am654_remove(struct platform_device *pdev) 870 { 871 struct sdhci_host *host = platform_get_drvdata(pdev); 872 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 873 struct device *dev = &pdev->dev; 874 int ret; 875 876 ret = pm_runtime_get_sync(dev); 877 if (ret < 0) 878 dev_err(dev, "pm_runtime_get_sync() Failed\n"); 879 880 sdhci_remove_host(host, true); 881 clk_disable_unprepare(pltfm_host->clk); 882 pm_runtime_disable(dev); 883 pm_runtime_put_noidle(dev); 884 sdhci_pltfm_free(pdev); 885 } 886 887 #ifdef CONFIG_PM 888 static int sdhci_am654_restore(struct sdhci_host *host) 889 { 890 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 891 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 892 u32 ctl_cfg_2 = 0; 893 u32 val; 894 int ret; 895 896 if (sdhci_am654->flags & DLL_CALIB) { 897 regmap_read(sdhci_am654->base, PHY_STAT1, &val); 898 if (~val & CALDONE_MASK) { 899 /* Calibrate IO lines */ 900 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, 901 PDB_MASK, PDB_MASK); 902 ret = regmap_read_poll_timeout(sdhci_am654->base, 903 PHY_STAT1, val, 904 val & CALDONE_MASK, 905 1, 20); 906 if (ret) 907 return ret; 908 } 909 } 910 911 /* Enable pins by setting IO mux to 0 */ 912 if (sdhci_am654->flags & IOMUX_PRESENT) 913 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, 914 IOMUX_ENABLE_MASK, 0); 915 916 /* Set slot type based on SD or eMMC */ 917 if (host->mmc->caps & MMC_CAP_NONREMOVABLE) 918 ctl_cfg_2 = SLOTTYPE_EMBEDDED; 919 920 regmap_update_bits(sdhci_am654->base, CTL_CFG_2, SLOTTYPE_MASK, 921 ctl_cfg_2); 922 923 regmap_read(sdhci_am654->base, CTL_CFG_3, &val); 924 if (~val & TUNINGFORSDR50_MASK) 925 /* Enable tuning for SDR50 */ 926 regmap_update_bits(sdhci_am654->base, CTL_CFG_3, TUNINGFORSDR50_MASK, 927 TUNINGFORSDR50_MASK); 928 929 return 0; 930 } 931 932 static int sdhci_am654_runtime_suspend(struct device *dev) 933 { 934 struct sdhci_host *host = dev_get_drvdata(dev); 935 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 936 int ret; 937 938 if (host->tuning_mode != SDHCI_TUNING_MODE_3) 939 mmc_retune_needed(host->mmc); 940 941 ret = cqhci_suspend(host->mmc); 942 if (ret) 943 return ret; 944 945 ret = sdhci_runtime_suspend_host(host); 946 if (ret) 947 return ret; 948 949 /* disable the clock */ 950 clk_disable_unprepare(pltfm_host->clk); 951 return 0; 952 } 953 954 static int sdhci_am654_runtime_resume(struct device *dev) 955 { 956 struct sdhci_host *host = dev_get_drvdata(dev); 957 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 958 int ret; 959 960 /* Enable the clock */ 961 ret = clk_prepare_enable(pltfm_host->clk); 962 if (ret) 963 return ret; 964 965 ret = sdhci_am654_restore(host); 966 if (ret) 967 return ret; 968 969 ret = sdhci_runtime_resume_host(host, 0); 970 if (ret) 971 return ret; 972 973 ret = cqhci_resume(host->mmc); 974 if (ret) 975 return ret; 976 977 return 0; 978 } 979 #endif 980 981 static const struct dev_pm_ops sdhci_am654_dev_pm_ops = { 982 SET_RUNTIME_PM_OPS(sdhci_am654_runtime_suspend, 983 sdhci_am654_runtime_resume, NULL) 984 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 985 pm_runtime_force_resume) 986 }; 987 988 static struct platform_driver sdhci_am654_driver = { 989 .driver = { 990 .name = "sdhci-am654", 991 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 992 .pm = &sdhci_am654_dev_pm_ops, 993 .of_match_table = sdhci_am654_of_match, 994 }, 995 .probe = sdhci_am654_probe, 996 .remove_new = sdhci_am654_remove, 997 }; 998 999 module_platform_driver(sdhci_am654_driver); 1000 1001 MODULE_DESCRIPTION("Driver for SDHCI Controller on TI's AM654 devices"); 1002 MODULE_AUTHOR("Faiz Abbas <faiz_abbas@ti.com>"); 1003 MODULE_LICENSE("GPL"); 1004