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 #define RETRY_TUNING_MAX 10 90 91 /* Command Queue Host Controller Interface Base address */ 92 #define SDHCI_AM654_CQE_BASE_ADDR 0x200 93 94 static const struct regmap_config sdhci_am654_regmap_config = { 95 .reg_bits = 32, 96 .val_bits = 32, 97 .reg_stride = 4, 98 .fast_io = true, 99 }; 100 101 struct timing_data { 102 const char *otap_binding; 103 const char *itap_binding; 104 u32 capability; 105 }; 106 107 static const struct timing_data td[] = { 108 [MMC_TIMING_LEGACY] = {"ti,otap-del-sel-legacy", 109 "ti,itap-del-sel-legacy", 110 0}, 111 [MMC_TIMING_MMC_HS] = {"ti,otap-del-sel-mmc-hs", 112 "ti,itap-del-sel-mmc-hs", 113 MMC_CAP_MMC_HIGHSPEED}, 114 [MMC_TIMING_SD_HS] = {"ti,otap-del-sel-sd-hs", 115 "ti,itap-del-sel-sd-hs", 116 MMC_CAP_SD_HIGHSPEED}, 117 [MMC_TIMING_UHS_SDR12] = {"ti,otap-del-sel-sdr12", 118 "ti,itap-del-sel-sdr12", 119 MMC_CAP_UHS_SDR12}, 120 [MMC_TIMING_UHS_SDR25] = {"ti,otap-del-sel-sdr25", 121 "ti,itap-del-sel-sdr25", 122 MMC_CAP_UHS_SDR25}, 123 [MMC_TIMING_UHS_SDR50] = {"ti,otap-del-sel-sdr50", 124 NULL, 125 MMC_CAP_UHS_SDR50}, 126 [MMC_TIMING_UHS_SDR104] = {"ti,otap-del-sel-sdr104", 127 NULL, 128 MMC_CAP_UHS_SDR104}, 129 [MMC_TIMING_UHS_DDR50] = {"ti,otap-del-sel-ddr50", 130 NULL, 131 MMC_CAP_UHS_DDR50}, 132 [MMC_TIMING_MMC_DDR52] = {"ti,otap-del-sel-ddr52", 133 "ti,itap-del-sel-ddr52", 134 MMC_CAP_DDR}, 135 [MMC_TIMING_MMC_HS200] = {"ti,otap-del-sel-hs200", 136 NULL, 137 MMC_CAP2_HS200}, 138 [MMC_TIMING_MMC_HS400] = {"ti,otap-del-sel-hs400", 139 NULL, 140 MMC_CAP2_HS400}, 141 }; 142 143 struct sdhci_am654_data { 144 struct regmap *base; 145 u32 otap_del_sel[ARRAY_SIZE(td)]; 146 u32 itap_del_sel[ARRAY_SIZE(td)]; 147 u32 itap_del_ena[ARRAY_SIZE(td)]; 148 int clkbuf_sel; 149 int trm_icp; 150 int drv_strength; 151 int strb_sel; 152 u32 flags; 153 u32 quirks; 154 bool dll_enable; 155 u32 tuning_loop; 156 157 #define SDHCI_AM654_QUIRK_FORCE_CDTEST BIT(0) 158 #define SDHCI_AM654_QUIRK_SUPPRESS_V1P8_ENA BIT(1) 159 }; 160 161 struct window { 162 u8 start; 163 u8 end; 164 u8 length; 165 }; 166 167 struct sdhci_am654_driver_data { 168 const struct sdhci_pltfm_data *pdata; 169 u32 flags; 170 u32 quirks; 171 #define IOMUX_PRESENT (1 << 0) 172 #define FREQSEL_2_BIT (1 << 1) 173 #define STRBSEL_4_BIT (1 << 2) 174 #define DLL_PRESENT (1 << 3) 175 #define DLL_CALIB (1 << 4) 176 }; 177 178 static void sdhci_am654_setup_dll(struct sdhci_host *host, unsigned int clock) 179 { 180 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 181 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 182 int sel50, sel100, freqsel; 183 u32 mask, val; 184 int ret; 185 186 /* Disable delay chain mode */ 187 regmap_update_bits(sdhci_am654->base, PHY_CTRL5, 188 SELDLYTXCLK_MASK | SELDLYRXCLK_MASK, 0); 189 190 if (sdhci_am654->flags & FREQSEL_2_BIT) { 191 switch (clock) { 192 case 200000000: 193 sel50 = 0; 194 sel100 = 0; 195 break; 196 case 100000000: 197 sel50 = 0; 198 sel100 = 1; 199 break; 200 default: 201 sel50 = 1; 202 sel100 = 0; 203 } 204 205 /* Configure PHY DLL frequency */ 206 mask = SEL50_MASK | SEL100_MASK; 207 val = (sel50 << SEL50_SHIFT) | (sel100 << SEL100_SHIFT); 208 regmap_update_bits(sdhci_am654->base, PHY_CTRL5, mask, val); 209 210 } else { 211 switch (clock) { 212 case 200000000: 213 freqsel = 0x0; 214 break; 215 default: 216 freqsel = 0x4; 217 } 218 219 regmap_update_bits(sdhci_am654->base, PHY_CTRL5, FREQSEL_MASK, 220 freqsel << FREQSEL_SHIFT); 221 } 222 /* Configure DLL TRIM */ 223 mask = DLL_TRIM_ICP_MASK; 224 val = sdhci_am654->trm_icp << DLL_TRIM_ICP_SHIFT; 225 226 /* Configure DLL driver strength */ 227 mask |= DR_TY_MASK; 228 val |= sdhci_am654->drv_strength << DR_TY_SHIFT; 229 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, mask, val); 230 231 /* Enable DLL */ 232 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, ENDLL_MASK, 233 0x1 << ENDLL_SHIFT); 234 /* 235 * Poll for DLL ready. Use a one second timeout. 236 * Works in all experiments done so far 237 */ 238 ret = regmap_read_poll_timeout(sdhci_am654->base, PHY_STAT1, val, 239 val & DLLRDY_MASK, 1000, 1000000); 240 if (ret) { 241 dev_err(mmc_dev(host->mmc), "DLL failed to relock\n"); 242 return; 243 } 244 } 245 246 static void sdhci_am654_write_itapdly(struct sdhci_am654_data *sdhci_am654, 247 u32 itapdly, u32 enable) 248 { 249 /* Set ITAPCHGWIN before writing to ITAPDLY */ 250 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPCHGWIN_MASK, 251 1 << ITAPCHGWIN_SHIFT); 252 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPDLYENA_MASK, 253 enable << ITAPDLYENA_SHIFT); 254 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPDLYSEL_MASK, 255 itapdly << ITAPDLYSEL_SHIFT); 256 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPCHGWIN_MASK, 0); 257 } 258 259 static void sdhci_am654_setup_delay_chain(struct sdhci_am654_data *sdhci_am654, 260 unsigned char timing) 261 { 262 u32 mask, val; 263 264 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, ENDLL_MASK, 0); 265 266 val = 1 << SELDLYTXCLK_SHIFT | 1 << SELDLYRXCLK_SHIFT; 267 mask = SELDLYTXCLK_MASK | SELDLYRXCLK_MASK; 268 regmap_update_bits(sdhci_am654->base, PHY_CTRL5, mask, val); 269 270 sdhci_am654_write_itapdly(sdhci_am654, sdhci_am654->itap_del_sel[timing], 271 sdhci_am654->itap_del_ena[timing]); 272 } 273 274 static void sdhci_am654_set_clock(struct sdhci_host *host, unsigned int clock) 275 { 276 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 277 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 278 unsigned char timing = host->mmc->ios.timing; 279 u32 otap_del_sel; 280 u32 mask, val; 281 282 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, ENDLL_MASK, 0); 283 284 sdhci_set_clock(host, clock); 285 286 /* Setup Output TAP delay */ 287 otap_del_sel = sdhci_am654->otap_del_sel[timing]; 288 289 mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK; 290 val = (0x1 << OTAPDLYENA_SHIFT) | 291 (otap_del_sel << OTAPDLYSEL_SHIFT); 292 293 /* Write to STRBSEL for HS400 speed mode */ 294 if (timing == MMC_TIMING_MMC_HS400) { 295 if (sdhci_am654->flags & STRBSEL_4_BIT) 296 mask |= STRBSEL_4BIT_MASK; 297 else 298 mask |= STRBSEL_8BIT_MASK; 299 300 val |= sdhci_am654->strb_sel << STRBSEL_SHIFT; 301 } 302 303 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val); 304 305 if (timing > MMC_TIMING_UHS_SDR25 && clock >= CLOCK_TOO_SLOW_HZ) { 306 sdhci_am654_setup_dll(host, clock); 307 sdhci_am654->dll_enable = true; 308 309 if (timing == MMC_TIMING_MMC_HS400) { 310 sdhci_am654->itap_del_ena[timing] = 0x1; 311 sdhci_am654->itap_del_sel[timing] = sdhci_am654->itap_del_sel[timing - 1]; 312 } 313 314 sdhci_am654_write_itapdly(sdhci_am654, sdhci_am654->itap_del_sel[timing], 315 sdhci_am654->itap_del_ena[timing]); 316 } else { 317 sdhci_am654_setup_delay_chain(sdhci_am654, timing); 318 sdhci_am654->dll_enable = false; 319 } 320 321 regmap_update_bits(sdhci_am654->base, PHY_CTRL5, CLKBUFSEL_MASK, 322 sdhci_am654->clkbuf_sel); 323 } 324 325 static void sdhci_j721e_4bit_set_clock(struct sdhci_host *host, 326 unsigned int clock) 327 { 328 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 329 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 330 unsigned char timing = host->mmc->ios.timing; 331 u32 otap_del_sel; 332 u32 itap_del_ena; 333 u32 itap_del_sel; 334 u32 mask, val; 335 336 /* Setup Output TAP delay */ 337 otap_del_sel = sdhci_am654->otap_del_sel[timing]; 338 339 mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK; 340 val = (0x1 << OTAPDLYENA_SHIFT) | 341 (otap_del_sel << OTAPDLYSEL_SHIFT); 342 343 /* Setup Input TAP delay */ 344 itap_del_ena = sdhci_am654->itap_del_ena[timing]; 345 itap_del_sel = sdhci_am654->itap_del_sel[timing]; 346 347 mask |= ITAPDLYENA_MASK | ITAPDLYSEL_MASK; 348 val |= (itap_del_ena << ITAPDLYENA_SHIFT) | 349 (itap_del_sel << ITAPDLYSEL_SHIFT); 350 351 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPCHGWIN_MASK, 352 1 << ITAPCHGWIN_SHIFT); 353 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val); 354 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPCHGWIN_MASK, 0); 355 regmap_update_bits(sdhci_am654->base, PHY_CTRL5, CLKBUFSEL_MASK, 356 sdhci_am654->clkbuf_sel); 357 358 sdhci_set_clock(host, clock); 359 } 360 361 static int sdhci_am654_start_signal_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios) 362 { 363 struct sdhci_host *host = mmc_priv(mmc); 364 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 365 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 366 int ret; 367 368 if ((sdhci_am654->quirks & SDHCI_AM654_QUIRK_SUPPRESS_V1P8_ENA) && 369 ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) { 370 if (!IS_ERR(mmc->supply.vqmmc)) { 371 ret = mmc_regulator_set_vqmmc(mmc, ios); 372 if (ret < 0) { 373 pr_err("%s: Switching to 1.8V signalling voltage failed,\n", 374 mmc_hostname(mmc)); 375 return -EIO; 376 } 377 } 378 return 0; 379 } 380 381 return sdhci_start_signal_voltage_switch(mmc, ios); 382 } 383 384 static u8 sdhci_am654_write_power_on(struct sdhci_host *host, u8 val, int reg) 385 { 386 writeb(val, host->ioaddr + reg); 387 usleep_range(1000, 10000); 388 return readb(host->ioaddr + reg); 389 } 390 391 #define MAX_POWER_ON_TIMEOUT 1500000 /* us */ 392 static void sdhci_am654_write_b(struct sdhci_host *host, u8 val, int reg) 393 { 394 unsigned char timing = host->mmc->ios.timing; 395 u8 pwr; 396 int ret; 397 398 if (reg == SDHCI_HOST_CONTROL) { 399 switch (timing) { 400 /* 401 * According to the data manual, HISPD bit 402 * should not be set in these speed modes. 403 */ 404 case MMC_TIMING_SD_HS: 405 case MMC_TIMING_MMC_HS: 406 val &= ~SDHCI_CTRL_HISPD; 407 } 408 } 409 410 writeb(val, host->ioaddr + reg); 411 if (reg == SDHCI_POWER_CONTROL && (val & SDHCI_POWER_ON)) { 412 /* 413 * Power on will not happen until the card detect debounce 414 * timer expires. Wait at least 1.5 seconds for the power on 415 * bit to be set 416 */ 417 ret = read_poll_timeout(sdhci_am654_write_power_on, pwr, 418 pwr & SDHCI_POWER_ON, 0, 419 MAX_POWER_ON_TIMEOUT, false, host, val, 420 reg); 421 if (ret) 422 dev_info(mmc_dev(host->mmc), "Power on failed\n"); 423 } 424 } 425 426 static void sdhci_am654_reset(struct sdhci_host *host, u8 mask) 427 { 428 u8 ctrl; 429 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 430 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 431 432 sdhci_and_cqhci_reset(host, mask); 433 434 if (sdhci_am654->quirks & SDHCI_AM654_QUIRK_FORCE_CDTEST) { 435 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 436 ctrl |= SDHCI_CTRL_CDTEST_INS | SDHCI_CTRL_CDTEST_EN; 437 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 438 } 439 } 440 441 static int sdhci_am654_execute_tuning(struct mmc_host *mmc, u32 opcode) 442 { 443 struct sdhci_host *host = mmc_priv(mmc); 444 int err = sdhci_execute_tuning(mmc, opcode); 445 446 if (err) 447 return err; 448 /* 449 * Tuning data remains in the buffer after tuning. 450 * Do a command and data reset to get rid of it 451 */ 452 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); 453 454 return 0; 455 } 456 457 static u32 sdhci_am654_cqhci_irq(struct sdhci_host *host, u32 intmask) 458 { 459 int cmd_error = 0; 460 int data_error = 0; 461 462 if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error)) 463 return intmask; 464 465 cqhci_irq(host->mmc, intmask, cmd_error, data_error); 466 467 return 0; 468 } 469 470 #define ITAPDLY_LENGTH 32 471 #define ITAPDLY_LAST_INDEX (ITAPDLY_LENGTH - 1) 472 473 static int sdhci_am654_calculate_itap(struct sdhci_host *host, struct window 474 *fail_window, u8 num_fails, bool circular_buffer) 475 { 476 u8 itap = 0, start_fail = 0, end_fail = 0, pass_length = 0; 477 u8 first_fail_start = 0, last_fail_end = 0; 478 struct device *dev = mmc_dev(host->mmc); 479 struct window pass_window = {0, 0, 0}; 480 int prev_fail_end = -1; 481 u8 i; 482 483 if (!num_fails) { 484 /* Retry tuning */ 485 dev_dbg(dev, "No failing region found, retry tuning\n"); 486 return -1; 487 } 488 489 if (fail_window->length == ITAPDLY_LENGTH) { 490 /* Retry tuning */ 491 dev_dbg(dev, "No passing itapdly, retry tuning\n"); 492 return -1; 493 } 494 495 first_fail_start = fail_window->start; 496 last_fail_end = fail_window[num_fails - 1].end; 497 498 for (i = 0; i < num_fails; i++) { 499 start_fail = fail_window[i].start; 500 end_fail = fail_window[i].end; 501 pass_length = start_fail - (prev_fail_end + 1); 502 503 if (pass_length > pass_window.length) { 504 pass_window.start = prev_fail_end + 1; 505 pass_window.length = pass_length; 506 } 507 prev_fail_end = end_fail; 508 } 509 510 if (!circular_buffer) 511 pass_length = ITAPDLY_LAST_INDEX - last_fail_end; 512 else 513 pass_length = ITAPDLY_LAST_INDEX - last_fail_end + first_fail_start; 514 515 if (pass_length > pass_window.length) { 516 pass_window.start = last_fail_end + 1; 517 pass_window.length = pass_length; 518 } 519 520 if (!circular_buffer) 521 itap = pass_window.start + (pass_window.length >> 1); 522 else 523 itap = (pass_window.start + (pass_window.length >> 1)) % ITAPDLY_LENGTH; 524 525 return (itap > ITAPDLY_LAST_INDEX) ? ITAPDLY_LAST_INDEX >> 1 : itap; 526 } 527 528 static int sdhci_am654_do_tuning(struct sdhci_host *host, 529 u32 opcode) 530 { 531 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 532 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 533 unsigned char timing = host->mmc->ios.timing; 534 struct window fail_window[ITAPDLY_LENGTH]; 535 struct device *dev = mmc_dev(host->mmc); 536 u8 curr_pass, itap; 537 u8 fail_index = 0; 538 u8 prev_pass = 1; 539 540 memset(fail_window, 0, sizeof(fail_window)); 541 542 /* Enable ITAPDLY */ 543 sdhci_am654->itap_del_ena[timing] = 0x1; 544 545 for (itap = 0; itap < ITAPDLY_LENGTH; itap++) { 546 sdhci_am654_write_itapdly(sdhci_am654, itap, sdhci_am654->itap_del_ena[timing]); 547 548 curr_pass = !mmc_send_tuning(host->mmc, opcode, NULL); 549 550 if (!curr_pass && prev_pass) 551 fail_window[fail_index].start = itap; 552 553 if (!curr_pass) { 554 fail_window[fail_index].end = itap; 555 fail_window[fail_index].length++; 556 dev_dbg(dev, "Failed itapdly=%d\n", itap); 557 } 558 559 if (curr_pass && !prev_pass) 560 fail_index++; 561 562 prev_pass = curr_pass; 563 } 564 565 if (fail_window[fail_index].length != 0) 566 fail_index++; 567 568 return sdhci_am654_calculate_itap(host, fail_window, fail_index, 569 sdhci_am654->dll_enable); 570 } 571 572 static int sdhci_am654_platform_execute_tuning(struct sdhci_host *host, 573 u32 opcode) 574 { 575 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 576 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 577 unsigned char timing = host->mmc->ios.timing; 578 struct device *dev = mmc_dev(host->mmc); 579 int itapdly; 580 581 do { 582 itapdly = sdhci_am654_do_tuning(host, opcode); 583 if (itapdly >= 0) 584 break; 585 } while (++sdhci_am654->tuning_loop < RETRY_TUNING_MAX); 586 587 if (itapdly < 0) { 588 dev_err(dev, "Failed to find itapdly, fail tuning\n"); 589 return -1; 590 } 591 592 dev_dbg(dev, "Passed tuning, final itapdly=%d\n", itapdly); 593 sdhci_am654_write_itapdly(sdhci_am654, itapdly, sdhci_am654->itap_del_ena[timing]); 594 /* Save ITAPDLY */ 595 sdhci_am654->itap_del_sel[timing] = itapdly; 596 597 return 0; 598 } 599 600 static const struct sdhci_ops sdhci_am654_ops = { 601 .platform_execute_tuning = sdhci_am654_platform_execute_tuning, 602 .get_max_clock = sdhci_pltfm_clk_get_max_clock, 603 .get_timeout_clock = sdhci_pltfm_clk_get_max_clock, 604 .set_uhs_signaling = sdhci_set_uhs_signaling, 605 .set_bus_width = sdhci_set_bus_width, 606 .set_power = sdhci_set_power_and_bus_voltage, 607 .set_clock = sdhci_am654_set_clock, 608 .write_b = sdhci_am654_write_b, 609 .irq = sdhci_am654_cqhci_irq, 610 .reset = sdhci_and_cqhci_reset, 611 }; 612 613 static const struct sdhci_pltfm_data sdhci_am654_pdata = { 614 .ops = &sdhci_am654_ops, 615 .quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12, 616 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | 617 SDHCI_QUIRK2_DISABLE_HW_TIMEOUT, 618 }; 619 620 static const struct sdhci_am654_driver_data sdhci_am654_sr1_drvdata = { 621 .pdata = &sdhci_am654_pdata, 622 .flags = IOMUX_PRESENT | FREQSEL_2_BIT | STRBSEL_4_BIT | DLL_PRESENT | 623 DLL_CALIB, 624 }; 625 626 static const struct sdhci_am654_driver_data sdhci_am654_drvdata = { 627 .pdata = &sdhci_am654_pdata, 628 .flags = IOMUX_PRESENT | FREQSEL_2_BIT | STRBSEL_4_BIT | DLL_PRESENT, 629 }; 630 631 static const struct sdhci_ops sdhci_j721e_8bit_ops = { 632 .platform_execute_tuning = sdhci_am654_platform_execute_tuning, 633 .get_max_clock = sdhci_pltfm_clk_get_max_clock, 634 .get_timeout_clock = sdhci_pltfm_clk_get_max_clock, 635 .set_uhs_signaling = sdhci_set_uhs_signaling, 636 .set_bus_width = sdhci_set_bus_width, 637 .set_power = sdhci_set_power_and_bus_voltage, 638 .set_clock = sdhci_am654_set_clock, 639 .write_b = sdhci_am654_write_b, 640 .irq = sdhci_am654_cqhci_irq, 641 .reset = sdhci_and_cqhci_reset, 642 }; 643 644 static const struct sdhci_pltfm_data sdhci_j721e_8bit_pdata = { 645 .ops = &sdhci_j721e_8bit_ops, 646 .quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12, 647 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | 648 SDHCI_QUIRK2_DISABLE_HW_TIMEOUT, 649 }; 650 651 static const struct sdhci_am654_driver_data sdhci_j721e_8bit_drvdata = { 652 .pdata = &sdhci_j721e_8bit_pdata, 653 .flags = DLL_PRESENT | DLL_CALIB, 654 }; 655 656 static const struct sdhci_ops sdhci_j721e_4bit_ops = { 657 .platform_execute_tuning = sdhci_am654_platform_execute_tuning, 658 .get_max_clock = sdhci_pltfm_clk_get_max_clock, 659 .get_timeout_clock = sdhci_pltfm_clk_get_max_clock, 660 .set_uhs_signaling = sdhci_set_uhs_signaling, 661 .set_bus_width = sdhci_set_bus_width, 662 .set_power = sdhci_set_power_and_bus_voltage, 663 .set_clock = sdhci_j721e_4bit_set_clock, 664 .write_b = sdhci_am654_write_b, 665 .irq = sdhci_am654_cqhci_irq, 666 .reset = sdhci_am654_reset, 667 }; 668 669 static const struct sdhci_pltfm_data sdhci_j721e_4bit_pdata = { 670 .ops = &sdhci_j721e_4bit_ops, 671 .quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12, 672 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | 673 SDHCI_QUIRK2_DISABLE_HW_TIMEOUT, 674 }; 675 676 static const struct sdhci_am654_driver_data sdhci_j721e_4bit_drvdata = { 677 .pdata = &sdhci_j721e_4bit_pdata, 678 .flags = IOMUX_PRESENT, 679 }; 680 681 static const struct sdhci_am654_driver_data sdhci_am62_4bit_drvdata = { 682 .pdata = &sdhci_j721e_4bit_pdata, 683 .flags = IOMUX_PRESENT, 684 .quirks = SDHCI_AM654_QUIRK_SUPPRESS_V1P8_ENA, 685 }; 686 687 static const struct soc_device_attribute sdhci_am654_devices[] = { 688 { .family = "AM65X", 689 .revision = "SR1.0", 690 .data = &sdhci_am654_sr1_drvdata 691 }, 692 {/* sentinel */} 693 }; 694 695 static void sdhci_am654_dumpregs(struct mmc_host *mmc) 696 { 697 sdhci_dumpregs(mmc_priv(mmc)); 698 } 699 700 static const struct cqhci_host_ops sdhci_am654_cqhci_ops = { 701 .enable = sdhci_cqe_enable, 702 .disable = sdhci_cqe_disable, 703 .dumpregs = sdhci_am654_dumpregs, 704 }; 705 706 static int sdhci_am654_cqe_add_host(struct sdhci_host *host) 707 { 708 struct cqhci_host *cq_host; 709 710 cq_host = devm_kzalloc(mmc_dev(host->mmc), sizeof(struct cqhci_host), 711 GFP_KERNEL); 712 if (!cq_host) 713 return -ENOMEM; 714 715 cq_host->mmio = host->ioaddr + SDHCI_AM654_CQE_BASE_ADDR; 716 cq_host->quirks |= CQHCI_QUIRK_SHORT_TXFR_DESC_SZ; 717 cq_host->caps |= CQHCI_TASK_DESC_SZ_128; 718 cq_host->ops = &sdhci_am654_cqhci_ops; 719 720 host->mmc->caps2 |= MMC_CAP2_CQE; 721 722 return cqhci_init(cq_host, host->mmc, 1); 723 } 724 725 static int sdhci_am654_get_otap_delay(struct sdhci_host *host, 726 struct sdhci_am654_data *sdhci_am654) 727 { 728 struct device *dev = mmc_dev(host->mmc); 729 int i; 730 int ret; 731 732 for (i = MMC_TIMING_LEGACY; i <= MMC_TIMING_MMC_HS400; i++) { 733 734 ret = device_property_read_u32(dev, td[i].otap_binding, 735 &sdhci_am654->otap_del_sel[i]); 736 if (ret) { 737 if (i == MMC_TIMING_LEGACY) { 738 dev_err(dev, "Couldn't find mandatory ti,otap-del-sel-legacy\n"); 739 return ret; 740 } 741 dev_dbg(dev, "Couldn't find %s\n", 742 td[i].otap_binding); 743 /* 744 * Remove the corresponding capability 745 * if an otap-del-sel value is not found 746 */ 747 if (i <= MMC_TIMING_MMC_DDR52) 748 host->mmc->caps &= ~td[i].capability; 749 else 750 host->mmc->caps2 &= ~td[i].capability; 751 } 752 753 if (td[i].itap_binding) { 754 ret = device_property_read_u32(dev, td[i].itap_binding, 755 &sdhci_am654->itap_del_sel[i]); 756 if (!ret) 757 sdhci_am654->itap_del_ena[i] = 0x1; 758 } 759 } 760 761 return 0; 762 } 763 764 static int sdhci_am654_init(struct sdhci_host *host) 765 { 766 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 767 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 768 u32 ctl_cfg_2 = 0; 769 u32 mask; 770 u32 val; 771 int ret; 772 773 /* Reset OTAP to default value */ 774 mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK; 775 regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, 0x0); 776 777 if (sdhci_am654->flags & DLL_CALIB) { 778 regmap_read(sdhci_am654->base, PHY_STAT1, &val); 779 if (~val & CALDONE_MASK) { 780 /* Calibrate IO lines */ 781 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, 782 PDB_MASK, PDB_MASK); 783 ret = regmap_read_poll_timeout(sdhci_am654->base, 784 PHY_STAT1, val, 785 val & CALDONE_MASK, 786 1, 20); 787 if (ret) 788 return ret; 789 } 790 } 791 792 /* Enable pins by setting IO mux to 0 */ 793 if (sdhci_am654->flags & IOMUX_PRESENT) 794 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, 795 IOMUX_ENABLE_MASK, 0); 796 797 /* Set slot type based on SD or eMMC */ 798 if (host->mmc->caps & MMC_CAP_NONREMOVABLE) 799 ctl_cfg_2 = SLOTTYPE_EMBEDDED; 800 801 regmap_update_bits(sdhci_am654->base, CTL_CFG_2, SLOTTYPE_MASK, 802 ctl_cfg_2); 803 804 /* Enable tuning for SDR50 */ 805 regmap_update_bits(sdhci_am654->base, CTL_CFG_3, TUNINGFORSDR50_MASK, 806 TUNINGFORSDR50_MASK); 807 808 /* Use to re-execute tuning */ 809 sdhci_am654->tuning_loop = 0; 810 811 ret = sdhci_setup_host(host); 812 if (ret) 813 return ret; 814 815 ret = sdhci_am654_cqe_add_host(host); 816 if (ret) 817 goto err_cleanup_host; 818 819 ret = sdhci_am654_get_otap_delay(host, sdhci_am654); 820 if (ret) 821 goto err_cleanup_host; 822 823 ret = __sdhci_add_host(host); 824 if (ret) 825 goto err_cleanup_host; 826 827 return 0; 828 829 err_cleanup_host: 830 sdhci_cleanup_host(host); 831 return ret; 832 } 833 834 static int sdhci_am654_get_of_property(struct platform_device *pdev, 835 struct sdhci_am654_data *sdhci_am654) 836 { 837 struct device *dev = &pdev->dev; 838 int drv_strength; 839 int ret; 840 841 if (sdhci_am654->flags & DLL_PRESENT) { 842 ret = device_property_read_u32(dev, "ti,trm-icp", 843 &sdhci_am654->trm_icp); 844 if (ret) 845 return ret; 846 847 ret = device_property_read_u32(dev, "ti,driver-strength-ohm", 848 &drv_strength); 849 if (ret) 850 return ret; 851 852 switch (drv_strength) { 853 case 50: 854 sdhci_am654->drv_strength = DRIVER_STRENGTH_50_OHM; 855 break; 856 case 33: 857 sdhci_am654->drv_strength = DRIVER_STRENGTH_33_OHM; 858 break; 859 case 66: 860 sdhci_am654->drv_strength = DRIVER_STRENGTH_66_OHM; 861 break; 862 case 100: 863 sdhci_am654->drv_strength = DRIVER_STRENGTH_100_OHM; 864 break; 865 case 40: 866 sdhci_am654->drv_strength = DRIVER_STRENGTH_40_OHM; 867 break; 868 default: 869 dev_err(dev, "Invalid driver strength\n"); 870 return -EINVAL; 871 } 872 } 873 874 device_property_read_u32(dev, "ti,strobe-sel", &sdhci_am654->strb_sel); 875 device_property_read_u32(dev, "ti,clkbuf-sel", 876 &sdhci_am654->clkbuf_sel); 877 878 if (device_property_read_bool(dev, "ti,fails-without-test-cd")) 879 sdhci_am654->quirks |= SDHCI_AM654_QUIRK_FORCE_CDTEST; 880 881 sdhci_get_of_property(pdev); 882 883 return 0; 884 } 885 886 static const struct of_device_id sdhci_am654_of_match[] = { 887 { 888 .compatible = "ti,am654-sdhci-5.1", 889 .data = &sdhci_am654_drvdata, 890 }, 891 { 892 .compatible = "ti,j721e-sdhci-8bit", 893 .data = &sdhci_j721e_8bit_drvdata, 894 }, 895 { 896 .compatible = "ti,j721e-sdhci-4bit", 897 .data = &sdhci_j721e_4bit_drvdata, 898 }, 899 { 900 .compatible = "ti,am64-sdhci-8bit", 901 .data = &sdhci_j721e_8bit_drvdata, 902 }, 903 { 904 .compatible = "ti,am64-sdhci-4bit", 905 .data = &sdhci_j721e_4bit_drvdata, 906 }, 907 { 908 .compatible = "ti,am62-sdhci", 909 .data = &sdhci_am62_4bit_drvdata, 910 }, 911 { /* sentinel */ } 912 }; 913 MODULE_DEVICE_TABLE(of, sdhci_am654_of_match); 914 915 static int sdhci_am654_probe(struct platform_device *pdev) 916 { 917 const struct sdhci_am654_driver_data *drvdata; 918 const struct soc_device_attribute *soc; 919 struct sdhci_pltfm_host *pltfm_host; 920 struct sdhci_am654_data *sdhci_am654; 921 const struct of_device_id *match; 922 struct sdhci_host *host; 923 struct clk *clk_xin; 924 struct device *dev = &pdev->dev; 925 void __iomem *base; 926 int ret; 927 928 match = of_match_node(sdhci_am654_of_match, pdev->dev.of_node); 929 drvdata = match->data; 930 931 /* Update drvdata based on SoC revision */ 932 soc = soc_device_match(sdhci_am654_devices); 933 if (soc && soc->data) 934 drvdata = soc->data; 935 936 host = sdhci_pltfm_init(pdev, drvdata->pdata, sizeof(*sdhci_am654)); 937 if (IS_ERR(host)) 938 return PTR_ERR(host); 939 940 pltfm_host = sdhci_priv(host); 941 sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 942 sdhci_am654->flags = drvdata->flags; 943 sdhci_am654->quirks = drvdata->quirks; 944 945 clk_xin = devm_clk_get(dev, "clk_xin"); 946 if (IS_ERR(clk_xin)) { 947 dev_err(dev, "clk_xin clock not found.\n"); 948 return PTR_ERR(clk_xin); 949 } 950 951 pltfm_host->clk = clk_xin; 952 953 base = devm_platform_ioremap_resource(pdev, 1); 954 if (IS_ERR(base)) { 955 return PTR_ERR(base); 956 } 957 958 sdhci_am654->base = devm_regmap_init_mmio(dev, base, 959 &sdhci_am654_regmap_config); 960 if (IS_ERR(sdhci_am654->base)) { 961 dev_err(dev, "Failed to initialize regmap\n"); 962 return PTR_ERR(sdhci_am654->base); 963 } 964 965 ret = sdhci_am654_get_of_property(pdev, sdhci_am654); 966 if (ret) 967 return ret; 968 969 ret = mmc_of_parse(host->mmc); 970 if (ret) 971 return dev_err_probe(dev, ret, "parsing dt failed\n"); 972 973 host->mmc_host_ops.start_signal_voltage_switch = sdhci_am654_start_signal_voltage_switch; 974 host->mmc_host_ops.execute_tuning = sdhci_am654_execute_tuning; 975 976 pm_runtime_get_noresume(dev); 977 ret = pm_runtime_set_active(dev); 978 if (ret) 979 goto pm_put; 980 pm_runtime_enable(dev); 981 ret = clk_prepare_enable(pltfm_host->clk); 982 if (ret) 983 goto pm_disable; 984 985 ret = sdhci_am654_init(host); 986 if (ret) 987 goto clk_disable; 988 989 /* Setting up autosuspend */ 990 pm_runtime_set_autosuspend_delay(dev, SDHCI_AM654_AUTOSUSPEND_DELAY); 991 pm_runtime_use_autosuspend(dev); 992 pm_runtime_put_autosuspend(dev); 993 return 0; 994 995 clk_disable: 996 clk_disable_unprepare(pltfm_host->clk); 997 pm_disable: 998 pm_runtime_disable(dev); 999 pm_put: 1000 pm_runtime_put_noidle(dev); 1001 return ret; 1002 } 1003 1004 static void sdhci_am654_remove(struct platform_device *pdev) 1005 { 1006 struct sdhci_host *host = platform_get_drvdata(pdev); 1007 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 1008 struct device *dev = &pdev->dev; 1009 int ret; 1010 1011 ret = pm_runtime_get_sync(dev); 1012 if (ret < 0) 1013 dev_err(dev, "pm_runtime_get_sync() Failed\n"); 1014 1015 sdhci_remove_host(host, true); 1016 clk_disable_unprepare(pltfm_host->clk); 1017 pm_runtime_disable(dev); 1018 pm_runtime_put_noidle(dev); 1019 } 1020 1021 #ifdef CONFIG_PM 1022 static int sdhci_am654_restore(struct sdhci_host *host) 1023 { 1024 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 1025 struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host); 1026 u32 ctl_cfg_2 = 0; 1027 u32 val; 1028 int ret; 1029 1030 if (sdhci_am654->flags & DLL_CALIB) { 1031 regmap_read(sdhci_am654->base, PHY_STAT1, &val); 1032 if (~val & CALDONE_MASK) { 1033 /* Calibrate IO lines */ 1034 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, 1035 PDB_MASK, PDB_MASK); 1036 ret = regmap_read_poll_timeout(sdhci_am654->base, 1037 PHY_STAT1, val, 1038 val & CALDONE_MASK, 1039 1, 20); 1040 if (ret) 1041 return ret; 1042 } 1043 } 1044 1045 /* Enable pins by setting IO mux to 0 */ 1046 if (sdhci_am654->flags & IOMUX_PRESENT) 1047 regmap_update_bits(sdhci_am654->base, PHY_CTRL1, 1048 IOMUX_ENABLE_MASK, 0); 1049 1050 /* Set slot type based on SD or eMMC */ 1051 if (host->mmc->caps & MMC_CAP_NONREMOVABLE) 1052 ctl_cfg_2 = SLOTTYPE_EMBEDDED; 1053 1054 regmap_update_bits(sdhci_am654->base, CTL_CFG_2, SLOTTYPE_MASK, 1055 ctl_cfg_2); 1056 1057 regmap_read(sdhci_am654->base, CTL_CFG_3, &val); 1058 if (~val & TUNINGFORSDR50_MASK) 1059 /* Enable tuning for SDR50 */ 1060 regmap_update_bits(sdhci_am654->base, CTL_CFG_3, TUNINGFORSDR50_MASK, 1061 TUNINGFORSDR50_MASK); 1062 1063 return 0; 1064 } 1065 1066 static int sdhci_am654_runtime_suspend(struct device *dev) 1067 { 1068 struct sdhci_host *host = dev_get_drvdata(dev); 1069 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 1070 int ret; 1071 1072 if (host->tuning_mode != SDHCI_TUNING_MODE_3) 1073 mmc_retune_needed(host->mmc); 1074 1075 ret = cqhci_suspend(host->mmc); 1076 if (ret) 1077 return ret; 1078 1079 sdhci_runtime_suspend_host(host); 1080 1081 /* disable the clock */ 1082 clk_disable_unprepare(pltfm_host->clk); 1083 return 0; 1084 } 1085 1086 static int sdhci_am654_runtime_resume(struct device *dev) 1087 { 1088 struct sdhci_host *host = dev_get_drvdata(dev); 1089 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 1090 int ret; 1091 1092 /* Enable the clock */ 1093 ret = clk_prepare_enable(pltfm_host->clk); 1094 if (ret) 1095 return ret; 1096 1097 ret = sdhci_am654_restore(host); 1098 if (ret) 1099 return ret; 1100 1101 sdhci_runtime_resume_host(host, 0); 1102 1103 ret = cqhci_resume(host->mmc); 1104 if (ret) 1105 return ret; 1106 1107 return 0; 1108 } 1109 #endif 1110 1111 static const struct dev_pm_ops sdhci_am654_dev_pm_ops = { 1112 SET_RUNTIME_PM_OPS(sdhci_am654_runtime_suspend, 1113 sdhci_am654_runtime_resume, NULL) 1114 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 1115 pm_runtime_force_resume) 1116 }; 1117 1118 static struct platform_driver sdhci_am654_driver = { 1119 .driver = { 1120 .name = "sdhci-am654", 1121 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1122 .pm = &sdhci_am654_dev_pm_ops, 1123 .of_match_table = sdhci_am654_of_match, 1124 }, 1125 .probe = sdhci_am654_probe, 1126 .remove = sdhci_am654_remove, 1127 }; 1128 1129 module_platform_driver(sdhci_am654_driver); 1130 1131 MODULE_DESCRIPTION("Driver for SDHCI Controller on TI's AM654 devices"); 1132 MODULE_AUTHOR("Faiz Abbas <faiz_abbas@ti.com>"); 1133 MODULE_LICENSE("GPL"); 1134