1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Renesas SDHI 4 * 5 * Copyright (C) 2015-19 Renesas Electronics Corporation 6 * Copyright (C) 2016-19 Sang Engineering, Wolfram Sang 7 * Copyright (C) 2016-17 Horms Solutions, Simon Horman 8 * Copyright (C) 2009 Magnus Damm 9 * 10 * Based on "Compaq ASIC3 support": 11 * 12 * Copyright 2001 Compaq Computer Corporation. 13 * Copyright 2004-2005 Phil Blundell 14 * Copyright 2007-2008 OpenedHand Ltd. 15 * 16 * Authors: Phil Blundell <pb@handhelds.org>, 17 * Samuel Ortiz <sameo@openedhand.com> 18 * 19 */ 20 21 #include <linux/kernel.h> 22 #include <linux/clk.h> 23 #include <linux/slab.h> 24 #include <linux/module.h> 25 #include <linux/of_device.h> 26 #include <linux/platform_device.h> 27 #include <linux/mmc/host.h> 28 #include <linux/mmc/slot-gpio.h> 29 #include <linux/mfd/tmio.h> 30 #include <linux/sh_dma.h> 31 #include <linux/delay.h> 32 #include <linux/pinctrl/consumer.h> 33 #include <linux/pinctrl/pinctrl-state.h> 34 #include <linux/regulator/consumer.h> 35 #include <linux/sys_soc.h> 36 37 #include "renesas_sdhi.h" 38 #include "tmio_mmc.h" 39 40 #define HOST_MODE 0xe4 41 42 #define SDHI_VER_GEN2_SDR50 0x490c 43 #define SDHI_VER_RZ_A1 0x820b 44 /* very old datasheets said 0x490c for SDR104, too. They are wrong! */ 45 #define SDHI_VER_GEN2_SDR104 0xcb0d 46 #define SDHI_VER_GEN3_SD 0xcc10 47 #define SDHI_VER_GEN3_SDMMC 0xcd10 48 49 struct renesas_sdhi_quirks { 50 bool hs400_disabled; 51 bool hs400_4taps; 52 }; 53 54 static void renesas_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width) 55 { 56 u32 val; 57 58 /* 59 * see also 60 * renesas_sdhi_of_data :: dma_buswidth 61 */ 62 switch (sd_ctrl_read16(host, CTL_VERSION)) { 63 case SDHI_VER_GEN2_SDR50: 64 val = (width == 32) ? 0x0001 : 0x0000; 65 break; 66 case SDHI_VER_GEN2_SDR104: 67 val = (width == 32) ? 0x0000 : 0x0001; 68 break; 69 case SDHI_VER_GEN3_SD: 70 case SDHI_VER_GEN3_SDMMC: 71 if (width == 64) 72 val = 0x0000; 73 else if (width == 32) 74 val = 0x0101; 75 else 76 val = 0x0001; 77 break; 78 default: 79 /* nothing to do */ 80 return; 81 } 82 83 sd_ctrl_write16(host, HOST_MODE, val); 84 } 85 86 static int renesas_sdhi_clk_enable(struct tmio_mmc_host *host) 87 { 88 struct mmc_host *mmc = host->mmc; 89 struct renesas_sdhi *priv = host_to_priv(host); 90 int ret = clk_prepare_enable(priv->clk); 91 92 if (ret < 0) 93 return ret; 94 95 ret = clk_prepare_enable(priv->clk_cd); 96 if (ret < 0) { 97 clk_disable_unprepare(priv->clk); 98 return ret; 99 } 100 101 /* 102 * The clock driver may not know what maximum frequency 103 * actually works, so it should be set with the max-frequency 104 * property which will already have been read to f_max. If it 105 * was missing, assume the current frequency is the maximum. 106 */ 107 if (!mmc->f_max) 108 mmc->f_max = clk_get_rate(priv->clk); 109 110 /* 111 * Minimum frequency is the minimum input clock frequency 112 * divided by our maximum divider. 113 */ 114 mmc->f_min = max(clk_round_rate(priv->clk, 1) / 512, 1L); 115 116 /* enable 16bit data access on SDBUF as default */ 117 renesas_sdhi_sdbuf_width(host, 16); 118 119 return 0; 120 } 121 122 static unsigned int renesas_sdhi_clk_update(struct tmio_mmc_host *host, 123 unsigned int new_clock) 124 { 125 struct renesas_sdhi *priv = host_to_priv(host); 126 unsigned int freq, diff, best_freq = 0, diff_min = ~0; 127 int i; 128 129 /* tested only on R-Car Gen2+ currently; may work for others */ 130 if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2)) 131 return clk_get_rate(priv->clk); 132 133 /* 134 * We want the bus clock to be as close as possible to, but no 135 * greater than, new_clock. As we can divide by 1 << i for 136 * any i in [0, 9] we want the input clock to be as close as 137 * possible, but no greater than, new_clock << i. 138 */ 139 for (i = min(9, ilog2(UINT_MAX / new_clock)); i >= 0; i--) { 140 freq = clk_round_rate(priv->clk, new_clock << i); 141 if (freq > (new_clock << i)) { 142 /* Too fast; look for a slightly slower option */ 143 freq = clk_round_rate(priv->clk, 144 (new_clock << i) / 4 * 3); 145 if (freq > (new_clock << i)) 146 continue; 147 } 148 149 diff = new_clock - (freq >> i); 150 if (diff <= diff_min) { 151 best_freq = freq; 152 diff_min = diff; 153 } 154 } 155 156 clk_set_rate(priv->clk, best_freq); 157 158 return clk_get_rate(priv->clk); 159 } 160 161 static void renesas_sdhi_set_clock(struct tmio_mmc_host *host, 162 unsigned int new_clock) 163 { 164 u32 clk = 0, clock; 165 166 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN & 167 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 168 169 if (new_clock == 0) { 170 host->mmc->actual_clock = 0; 171 goto out; 172 } 173 174 host->mmc->actual_clock = renesas_sdhi_clk_update(host, new_clock); 175 clock = host->mmc->actual_clock / 512; 176 177 for (clk = 0x80000080; new_clock >= (clock << 1); clk >>= 1) 178 clock <<= 1; 179 180 /* 1/1 clock is option */ 181 if ((host->pdata->flags & TMIO_MMC_CLK_ACTUAL) && ((clk >> 22) & 0x1)) { 182 if (!(host->mmc->ios.timing == MMC_TIMING_MMC_HS400)) 183 clk |= 0xff; 184 else 185 clk &= ~0xff; 186 } 187 188 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK); 189 if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2)) 190 usleep_range(10000, 11000); 191 192 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN | 193 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 194 195 out: 196 /* HW engineers overrode docs: no sleep needed on R-Car2+ */ 197 if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2)) 198 usleep_range(10000, 11000); 199 } 200 201 static void renesas_sdhi_clk_disable(struct tmio_mmc_host *host) 202 { 203 struct renesas_sdhi *priv = host_to_priv(host); 204 205 clk_disable_unprepare(priv->clk); 206 clk_disable_unprepare(priv->clk_cd); 207 } 208 209 static int renesas_sdhi_card_busy(struct mmc_host *mmc) 210 { 211 struct tmio_mmc_host *host = mmc_priv(mmc); 212 213 return !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) & 214 TMIO_STAT_DAT0); 215 } 216 217 static int renesas_sdhi_start_signal_voltage_switch(struct mmc_host *mmc, 218 struct mmc_ios *ios) 219 { 220 struct tmio_mmc_host *host = mmc_priv(mmc); 221 struct renesas_sdhi *priv = host_to_priv(host); 222 struct pinctrl_state *pin_state; 223 int ret; 224 225 switch (ios->signal_voltage) { 226 case MMC_SIGNAL_VOLTAGE_330: 227 pin_state = priv->pins_default; 228 break; 229 case MMC_SIGNAL_VOLTAGE_180: 230 pin_state = priv->pins_uhs; 231 break; 232 default: 233 return -EINVAL; 234 } 235 236 /* 237 * If anything is missing, assume signal voltage is fixed at 238 * 3.3V and succeed/fail accordingly. 239 */ 240 if (IS_ERR(priv->pinctrl) || IS_ERR(pin_state)) 241 return ios->signal_voltage == 242 MMC_SIGNAL_VOLTAGE_330 ? 0 : -EINVAL; 243 244 ret = mmc_regulator_set_vqmmc(host->mmc, ios); 245 if (ret) 246 return ret; 247 248 return pinctrl_select_state(priv->pinctrl, pin_state); 249 } 250 251 /* SCC registers */ 252 #define SH_MOBILE_SDHI_SCC_DTCNTL 0x000 253 #define SH_MOBILE_SDHI_SCC_TAPSET 0x002 254 #define SH_MOBILE_SDHI_SCC_DT2FF 0x004 255 #define SH_MOBILE_SDHI_SCC_CKSEL 0x006 256 #define SH_MOBILE_SDHI_SCC_RVSCNTL 0x008 257 #define SH_MOBILE_SDHI_SCC_RVSREQ 0x00A 258 #define SH_MOBILE_SDHI_SCC_TMPPORT2 0x00E 259 260 /* Definitions for values the SH_MOBILE_SDHI_SCC_DTCNTL register */ 261 #define SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN BIT(0) 262 #define SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT 16 263 #define SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_MASK 0xff 264 265 /* Definitions for values the SH_MOBILE_SDHI_SCC_CKSEL register */ 266 #define SH_MOBILE_SDHI_SCC_CKSEL_DTSEL BIT(0) 267 /* Definitions for values the SH_MOBILE_SDHI_SCC_RVSCNTL register */ 268 #define SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN BIT(0) 269 /* Definitions for values the SH_MOBILE_SDHI_SCC_RVSREQ register */ 270 #define SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR BIT(2) 271 /* Definitions for values the SH_MOBILE_SDHI_SCC_TMPPORT2 register */ 272 #define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL BIT(4) 273 #define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN BIT(31) 274 275 static inline u32 sd_scc_read32(struct tmio_mmc_host *host, 276 struct renesas_sdhi *priv, int addr) 277 { 278 return readl(priv->scc_ctl + (addr << host->bus_shift)); 279 } 280 281 static inline void sd_scc_write32(struct tmio_mmc_host *host, 282 struct renesas_sdhi *priv, 283 int addr, u32 val) 284 { 285 writel(val, priv->scc_ctl + (addr << host->bus_shift)); 286 } 287 288 static unsigned int renesas_sdhi_init_tuning(struct tmio_mmc_host *host) 289 { 290 struct renesas_sdhi *priv; 291 292 priv = host_to_priv(host); 293 294 /* Initialize SCC */ 295 sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, 0x0); 296 297 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN & 298 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 299 300 /* set sampling clock selection range */ 301 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL, 302 SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN | 303 0x8 << SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT); 304 305 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL, 306 SH_MOBILE_SDHI_SCC_CKSEL_DTSEL | 307 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL)); 308 309 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL, 310 ~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN & 311 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL)); 312 313 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, priv->scc_tappos); 314 315 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN | 316 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 317 318 /* Read TAPNUM */ 319 return (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL) >> 320 SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT) & 321 SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_MASK; 322 } 323 324 static void renesas_sdhi_prepare_tuning(struct tmio_mmc_host *host, 325 unsigned long tap) 326 { 327 struct renesas_sdhi *priv = host_to_priv(host); 328 329 /* Set sampling clock position */ 330 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, tap); 331 } 332 333 static void renesas_sdhi_hs400_complete(struct tmio_mmc_host *host) 334 { 335 struct renesas_sdhi *priv = host_to_priv(host); 336 337 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN & 338 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 339 340 /* Set HS400 mode */ 341 sd_ctrl_write16(host, CTL_SDIF_MODE, 0x0001 | 342 sd_ctrl_read16(host, CTL_SDIF_MODE)); 343 344 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, 345 priv->scc_tappos_hs400); 346 347 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2, 348 (SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN | 349 SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) | 350 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2)); 351 352 /* Set the sampling clock selection range of HS400 mode */ 353 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL, 354 SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN | 355 0x4 << SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT); 356 357 358 if (host->pdata->flags & TMIO_MMC_HAVE_4TAP_HS400) 359 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, 360 host->tap_set / 2); 361 362 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL, 363 SH_MOBILE_SDHI_SCC_CKSEL_DTSEL | 364 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL)); 365 366 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN | 367 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 368 } 369 370 static void renesas_sdhi_reset_scc(struct tmio_mmc_host *host, 371 struct renesas_sdhi *priv) 372 { 373 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN & 374 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 375 376 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL, 377 ~SH_MOBILE_SDHI_SCC_CKSEL_DTSEL & 378 sd_scc_read32(host, priv, 379 SH_MOBILE_SDHI_SCC_CKSEL)); 380 } 381 382 static void renesas_sdhi_disable_scc(struct tmio_mmc_host *host) 383 { 384 struct renesas_sdhi *priv = host_to_priv(host); 385 386 renesas_sdhi_reset_scc(host, priv); 387 388 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL, 389 ~SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN & 390 sd_scc_read32(host, priv, 391 SH_MOBILE_SDHI_SCC_DTCNTL)); 392 393 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN | 394 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 395 } 396 397 static void renesas_sdhi_reset_hs400_mode(struct tmio_mmc_host *host, 398 struct renesas_sdhi *priv) 399 { 400 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN & 401 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 402 403 /* Reset HS400 mode */ 404 sd_ctrl_write16(host, CTL_SDIF_MODE, ~0x0001 & 405 sd_ctrl_read16(host, CTL_SDIF_MODE)); 406 407 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, priv->scc_tappos); 408 409 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2, 410 ~(SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN | 411 SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) & 412 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2)); 413 414 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN | 415 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 416 } 417 418 static void renesas_sdhi_prepare_hs400_tuning(struct tmio_mmc_host *host) 419 { 420 renesas_sdhi_reset_hs400_mode(host, host_to_priv(host)); 421 } 422 423 #define SH_MOBILE_SDHI_MAX_TAP 3 424 425 static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host) 426 { 427 struct renesas_sdhi *priv = host_to_priv(host); 428 unsigned long tap_cnt; /* counter of tuning success */ 429 unsigned long tap_start;/* start position of tuning success */ 430 unsigned long tap_end; /* end position of tuning success */ 431 unsigned long ntap; /* temporary counter of tuning success */ 432 unsigned long i; 433 434 /* Clear SCC_RVSREQ */ 435 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0); 436 437 /* 438 * When tuning CMD19 is issued twice for each tap, merge the 439 * result requiring the tap to be good in both runs before 440 * considering it for tuning selection. 441 */ 442 for (i = 0; i < host->tap_num * 2; i++) { 443 int offset = host->tap_num * (i < host->tap_num ? 1 : -1); 444 445 if (!test_bit(i, host->taps)) 446 clear_bit(i + offset, host->taps); 447 } 448 449 /* 450 * Find the longest consecutive run of successful probes. If that 451 * is more than SH_MOBILE_SDHI_MAX_TAP probes long then use the 452 * center index as the tap. 453 */ 454 tap_cnt = 0; 455 ntap = 0; 456 tap_start = 0; 457 tap_end = 0; 458 for (i = 0; i < host->tap_num * 2; i++) { 459 if (test_bit(i, host->taps)) { 460 ntap++; 461 } else { 462 if (ntap > tap_cnt) { 463 tap_start = i - ntap; 464 tap_end = i - 1; 465 tap_cnt = ntap; 466 } 467 ntap = 0; 468 } 469 } 470 471 if (ntap > tap_cnt) { 472 tap_start = i - ntap; 473 tap_end = i - 1; 474 tap_cnt = ntap; 475 } 476 477 if (tap_cnt >= SH_MOBILE_SDHI_MAX_TAP) 478 host->tap_set = (tap_start + tap_end) / 2 % host->tap_num; 479 else 480 return -EIO; 481 482 /* Set SCC */ 483 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, host->tap_set); 484 485 /* Enable auto re-tuning */ 486 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL, 487 SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN | 488 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL)); 489 490 return 0; 491 } 492 493 static bool renesas_sdhi_check_scc_error(struct tmio_mmc_host *host) 494 { 495 struct renesas_sdhi *priv = host_to_priv(host); 496 bool use_4tap = host->pdata->flags & TMIO_MMC_HAVE_4TAP_HS400; 497 498 /* 499 * Skip checking SCC errors when running on 4 taps in HS400 mode as 500 * any retuning would still result in the same 4 taps being used. 501 */ 502 if (!(host->mmc->ios.timing == MMC_TIMING_UHS_SDR104) && 503 !(host->mmc->ios.timing == MMC_TIMING_MMC_HS200) && 504 !(host->mmc->ios.timing == MMC_TIMING_MMC_HS400 && !use_4tap)) 505 return false; 506 507 if (mmc_doing_retune(host->mmc)) 508 return false; 509 510 /* Check SCC error */ 511 if (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL) & 512 SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN && 513 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ) & 514 SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR) { 515 /* Clear SCC error */ 516 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0); 517 return true; 518 } 519 520 return false; 521 } 522 523 static void renesas_sdhi_hw_reset(struct tmio_mmc_host *host) 524 { 525 struct renesas_sdhi *priv; 526 527 priv = host_to_priv(host); 528 529 renesas_sdhi_reset_scc(host, priv); 530 renesas_sdhi_reset_hs400_mode(host, priv); 531 532 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN | 533 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 534 535 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL, 536 ~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN & 537 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL)); 538 539 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL, 540 ~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN & 541 sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL)); 542 543 if (host->pdata->flags & TMIO_MMC_MIN_RCAR2) 544 sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, 545 TMIO_MASK_INIT_RCAR2); 546 } 547 548 static int renesas_sdhi_wait_idle(struct tmio_mmc_host *host, u32 bit) 549 { 550 int timeout = 1000; 551 /* CBSY is set when busy, SCLKDIVEN is cleared when busy */ 552 u32 wait_state = (bit == TMIO_STAT_CMD_BUSY ? TMIO_STAT_CMD_BUSY : 0); 553 554 while (--timeout && (sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) 555 & bit) == wait_state) 556 udelay(1); 557 558 if (!timeout) { 559 dev_warn(&host->pdev->dev, "timeout waiting for SD bus idle\n"); 560 return -EBUSY; 561 } 562 563 return 0; 564 } 565 566 static int renesas_sdhi_write16_hook(struct tmio_mmc_host *host, int addr) 567 { 568 u32 bit = TMIO_STAT_SCLKDIVEN; 569 570 switch (addr) { 571 case CTL_SD_CMD: 572 case CTL_STOP_INTERNAL_ACTION: 573 case CTL_XFER_BLK_COUNT: 574 case CTL_SD_XFER_LEN: 575 case CTL_SD_MEM_CARD_OPT: 576 case CTL_TRANSACTION_CTL: 577 case CTL_DMA_ENABLE: 578 case HOST_MODE: 579 if (host->pdata->flags & TMIO_MMC_HAVE_CBSY) 580 bit = TMIO_STAT_CMD_BUSY; 581 /* fallthrough */ 582 case CTL_SD_CARD_CLK_CTL: 583 return renesas_sdhi_wait_idle(host, bit); 584 } 585 586 return 0; 587 } 588 589 static int renesas_sdhi_multi_io_quirk(struct mmc_card *card, 590 unsigned int direction, int blk_size) 591 { 592 /* 593 * In Renesas controllers, when performing a 594 * multiple block read of one or two blocks, 595 * depending on the timing with which the 596 * response register is read, the response 597 * value may not be read properly. 598 * Use single block read for this HW bug 599 */ 600 if ((direction == MMC_DATA_READ) && 601 blk_size == 2) 602 return 1; 603 604 return blk_size; 605 } 606 607 static void renesas_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable) 608 { 609 /* Iff regs are 8 byte apart, sdbuf is 64 bit. Otherwise always 32. */ 610 int width = (host->bus_shift == 2) ? 64 : 32; 611 612 sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? DMA_ENABLE_DMASDRW : 0); 613 renesas_sdhi_sdbuf_width(host, enable ? width : 16); 614 } 615 616 static const struct renesas_sdhi_quirks sdhi_quirks_4tap_nohs400 = { 617 .hs400_disabled = true, 618 .hs400_4taps = true, 619 }; 620 621 static const struct renesas_sdhi_quirks sdhi_quirks_4tap = { 622 .hs400_4taps = true, 623 }; 624 625 static const struct renesas_sdhi_quirks sdhi_quirks_nohs400 = { 626 .hs400_disabled = true, 627 }; 628 629 static const struct soc_device_attribute sdhi_quirks_match[] = { 630 { .soc_id = "r8a7795", .revision = "ES1.*", .data = &sdhi_quirks_4tap_nohs400 }, 631 { .soc_id = "r8a7795", .revision = "ES2.0", .data = &sdhi_quirks_4tap }, 632 { .soc_id = "r8a7796", .revision = "ES1.[012]", .data = &sdhi_quirks_4tap_nohs400 }, 633 { .soc_id = "r8a774a1", .revision = "ES1.[012]", .data = &sdhi_quirks_4tap_nohs400 }, 634 { .soc_id = "r8a77980", .data = &sdhi_quirks_nohs400 }, 635 { /* Sentinel. */ }, 636 }; 637 638 int renesas_sdhi_probe(struct platform_device *pdev, 639 const struct tmio_mmc_dma_ops *dma_ops) 640 { 641 struct tmio_mmc_data *mmd = pdev->dev.platform_data; 642 const struct renesas_sdhi_quirks *quirks = NULL; 643 const struct renesas_sdhi_of_data *of_data; 644 const struct soc_device_attribute *attr; 645 struct tmio_mmc_data *mmc_data; 646 struct tmio_mmc_dma *dma_priv; 647 struct tmio_mmc_host *host; 648 struct renesas_sdhi *priv; 649 struct resource *res; 650 int irq, ret, i; 651 u16 ver; 652 653 of_data = of_device_get_match_data(&pdev->dev); 654 655 attr = soc_device_match(sdhi_quirks_match); 656 if (attr) 657 quirks = attr->data; 658 659 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 660 if (!res) 661 return -EINVAL; 662 663 priv = devm_kzalloc(&pdev->dev, sizeof(struct renesas_sdhi), 664 GFP_KERNEL); 665 if (!priv) 666 return -ENOMEM; 667 668 mmc_data = &priv->mmc_data; 669 dma_priv = &priv->dma_priv; 670 671 priv->clk = devm_clk_get(&pdev->dev, NULL); 672 if (IS_ERR(priv->clk)) { 673 ret = PTR_ERR(priv->clk); 674 dev_err(&pdev->dev, "cannot get clock: %d\n", ret); 675 return ret; 676 } 677 678 /* 679 * Some controllers provide a 2nd clock just to run the internal card 680 * detection logic. Unfortunately, the existing driver architecture does 681 * not support a separation of clocks for runtime PM usage. When 682 * native hotplug is used, the tmio driver assumes that the core 683 * must continue to run for card detect to stay active, so we cannot 684 * disable it. 685 * Additionally, it is prohibited to supply a clock to the core but not 686 * to the card detect circuit. That leaves us with if separate clocks 687 * are presented, we must treat them both as virtually 1 clock. 688 */ 689 priv->clk_cd = devm_clk_get(&pdev->dev, "cd"); 690 if (IS_ERR(priv->clk_cd)) 691 priv->clk_cd = NULL; 692 693 priv->pinctrl = devm_pinctrl_get(&pdev->dev); 694 if (!IS_ERR(priv->pinctrl)) { 695 priv->pins_default = pinctrl_lookup_state(priv->pinctrl, 696 PINCTRL_STATE_DEFAULT); 697 priv->pins_uhs = pinctrl_lookup_state(priv->pinctrl, 698 "state_uhs"); 699 } 700 701 host = tmio_mmc_host_alloc(pdev, mmc_data); 702 if (IS_ERR(host)) 703 return PTR_ERR(host); 704 705 if (of_data) { 706 mmc_data->flags |= of_data->tmio_flags; 707 mmc_data->ocr_mask = of_data->tmio_ocr_mask; 708 mmc_data->capabilities |= of_data->capabilities; 709 mmc_data->capabilities2 |= of_data->capabilities2; 710 mmc_data->dma_rx_offset = of_data->dma_rx_offset; 711 mmc_data->max_blk_count = of_data->max_blk_count; 712 mmc_data->max_segs = of_data->max_segs; 713 dma_priv->dma_buswidth = of_data->dma_buswidth; 714 host->bus_shift = of_data->bus_shift; 715 } 716 717 host->write16_hook = renesas_sdhi_write16_hook; 718 host->clk_enable = renesas_sdhi_clk_enable; 719 host->clk_disable = renesas_sdhi_clk_disable; 720 host->set_clock = renesas_sdhi_set_clock; 721 host->multi_io_quirk = renesas_sdhi_multi_io_quirk; 722 host->dma_ops = dma_ops; 723 724 if (quirks && quirks->hs400_disabled) 725 host->mmc->caps2 &= ~(MMC_CAP2_HS400 | MMC_CAP2_HS400_ES); 726 727 if (quirks && quirks->hs400_4taps) 728 mmc_data->flags |= TMIO_MMC_HAVE_4TAP_HS400; 729 730 /* For some SoC, we disable internal WP. GPIO may override this */ 731 if (mmc_can_gpio_ro(host->mmc)) 732 mmc_data->capabilities2 &= ~MMC_CAP2_NO_WRITE_PROTECT; 733 734 /* SDR speeds are only available on Gen2+ */ 735 if (mmc_data->flags & TMIO_MMC_MIN_RCAR2) { 736 /* card_busy caused issues on r8a73a4 (pre-Gen2) CD-less SDHI */ 737 host->ops.card_busy = renesas_sdhi_card_busy; 738 host->ops.start_signal_voltage_switch = 739 renesas_sdhi_start_signal_voltage_switch; 740 host->sdcard_irq_setbit_mask = TMIO_STAT_ALWAYS_SET_27; 741 742 /* SDR and HS200/400 registers requires HW reset */ 743 if (of_data && of_data->scc_offset) { 744 priv->scc_ctl = host->ctl + of_data->scc_offset; 745 host->mmc->caps |= MMC_CAP_HW_RESET; 746 host->hw_reset = renesas_sdhi_hw_reset; 747 } 748 } 749 750 /* Orginally registers were 16 bit apart, could be 32 or 64 nowadays */ 751 if (!host->bus_shift && resource_size(res) > 0x100) /* old way to determine the shift */ 752 host->bus_shift = 1; 753 754 if (mmd) 755 *mmc_data = *mmd; 756 757 dma_priv->filter = shdma_chan_filter; 758 dma_priv->enable = renesas_sdhi_enable_dma; 759 760 mmc_data->alignment_shift = 1; /* 2-byte alignment */ 761 mmc_data->capabilities |= MMC_CAP_MMC_HIGHSPEED; 762 763 /* 764 * All SDHI blocks support 2-byte and larger block sizes in 4-bit 765 * bus width mode. 766 */ 767 mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES; 768 769 /* 770 * All SDHI blocks support SDIO IRQ signalling. 771 */ 772 mmc_data->flags |= TMIO_MMC_SDIO_IRQ; 773 774 /* All SDHI have CMD12 control bit */ 775 mmc_data->flags |= TMIO_MMC_HAVE_CMD12_CTRL; 776 777 /* All SDHI have SDIO status bits which must be 1 */ 778 mmc_data->flags |= TMIO_MMC_SDIO_STATUS_SETBITS; 779 780 ret = renesas_sdhi_clk_enable(host); 781 if (ret) 782 goto efree; 783 784 ver = sd_ctrl_read16(host, CTL_VERSION); 785 /* GEN2_SDR104 is first known SDHI to use 32bit block count */ 786 if (ver < SDHI_VER_GEN2_SDR104 && mmc_data->max_blk_count > U16_MAX) 787 mmc_data->max_blk_count = U16_MAX; 788 789 /* One Gen2 SDHI incarnation does NOT have a CBSY bit */ 790 if (ver == SDHI_VER_GEN2_SDR50) 791 mmc_data->flags &= ~TMIO_MMC_HAVE_CBSY; 792 793 ret = tmio_mmc_host_probe(host); 794 if (ret < 0) 795 goto edisclk; 796 797 /* Enable tuning iff we have an SCC and a supported mode */ 798 if (of_data && of_data->scc_offset && 799 (host->mmc->caps & MMC_CAP_UHS_SDR104 || 800 host->mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR | 801 MMC_CAP2_HS400_1_8V))) { 802 const struct renesas_sdhi_scc *taps = of_data->taps; 803 bool hit = false; 804 805 for (i = 0; i < of_data->taps_num; i++) { 806 if (taps[i].clk_rate == 0 || 807 taps[i].clk_rate == host->mmc->f_max) { 808 priv->scc_tappos = taps->tap; 809 priv->scc_tappos_hs400 = taps->tap_hs400; 810 hit = true; 811 break; 812 } 813 } 814 815 if (!hit) 816 dev_warn(&host->pdev->dev, "Unknown clock rate for SDR104\n"); 817 818 host->init_tuning = renesas_sdhi_init_tuning; 819 host->prepare_tuning = renesas_sdhi_prepare_tuning; 820 host->select_tuning = renesas_sdhi_select_tuning; 821 host->check_scc_error = renesas_sdhi_check_scc_error; 822 host->prepare_hs400_tuning = 823 renesas_sdhi_prepare_hs400_tuning; 824 host->hs400_downgrade = renesas_sdhi_disable_scc; 825 host->hs400_complete = renesas_sdhi_hs400_complete; 826 } 827 828 i = 0; 829 while (1) { 830 irq = platform_get_irq(pdev, i); 831 if (irq < 0) 832 break; 833 i++; 834 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0, 835 dev_name(&pdev->dev), host); 836 if (ret) 837 goto eirq; 838 } 839 840 /* There must be at least one IRQ source */ 841 if (!i) { 842 ret = irq; 843 goto eirq; 844 } 845 846 dev_info(&pdev->dev, "%s base at 0x%08lx max clock rate %u MHz\n", 847 mmc_hostname(host->mmc), (unsigned long) 848 (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start), 849 host->mmc->f_max / 1000000); 850 851 return ret; 852 853 eirq: 854 tmio_mmc_host_remove(host); 855 edisclk: 856 renesas_sdhi_clk_disable(host); 857 efree: 858 tmio_mmc_host_free(host); 859 860 return ret; 861 } 862 EXPORT_SYMBOL_GPL(renesas_sdhi_probe); 863 864 int renesas_sdhi_remove(struct platform_device *pdev) 865 { 866 struct tmio_mmc_host *host = platform_get_drvdata(pdev); 867 868 tmio_mmc_host_remove(host); 869 renesas_sdhi_clk_disable(host); 870 871 return 0; 872 } 873 EXPORT_SYMBOL_GPL(renesas_sdhi_remove); 874 875 MODULE_LICENSE("GPL v2"); 876