drivers/mmc/host/renesas_sdhi_core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Renesas SDHI
   4  *
   5  * Copyright (C) 2015-17 Renesas Electronics Corporation
   6  * Copyright (C) 2016-17 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, ret;
 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         ret = clk_set_rate(priv->clk, best_freq);
 157
 158         return ret == 0 ? best_freq : 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                 goto out;
 171
 172         clock = renesas_sdhi_clk_update(host, new_clock) / 512;
 173
 174         for (clk = 0x80000080; new_clock >= (clock << 1); clk >>= 1)
 175                 clock <<= 1;
 176
 177         /* 1/1 clock is option */
 178         if ((host->pdata->flags & TMIO_MMC_CLK_ACTUAL) && ((clk >> 22) & 0x1)) {
 179                 if (!(host->mmc->ios.timing == MMC_TIMING_MMC_HS400))
 180                         clk |= 0xff;
 181                 else
 182                         clk &= ~0xff;
 183         }
 184
 185         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK);
 186         if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
 187                 usleep_range(10000, 11000);
 188
 189         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
 190                 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
 191
 192 out:
 193         /* HW engineers overrode docs: no sleep needed on R-Car2+ */
 194         if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
 195                 usleep_range(10000, 11000);
 196 }
 197
 198 static void renesas_sdhi_clk_disable(struct tmio_mmc_host *host)
 199 {
 200         struct renesas_sdhi *priv = host_to_priv(host);
 201
 202         clk_disable_unprepare(priv->clk);
 203         clk_disable_unprepare(priv->clk_cd);
 204 }
 205
 206 static int renesas_sdhi_card_busy(struct mmc_host *mmc)
 207 {
 208         struct tmio_mmc_host *host = mmc_priv(mmc);
 209
 210         return !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) &
 211                  TMIO_STAT_DAT0);
 212 }
 213
 214 static int renesas_sdhi_start_signal_voltage_switch(struct mmc_host *mmc,
 215                                                     struct mmc_ios *ios)
 216 {
 217         struct tmio_mmc_host *host = mmc_priv(mmc);
 218         struct renesas_sdhi *priv = host_to_priv(host);
 219         struct pinctrl_state *pin_state;
 220         int ret;
 221
 222         switch (ios->signal_voltage) {
 223         case MMC_SIGNAL_VOLTAGE_330:
 224                 pin_state = priv->pins_default;
 225                 break;
 226         case MMC_SIGNAL_VOLTAGE_180:
 227                 pin_state = priv->pins_uhs;
 228                 break;
 229         default:
 230                 return -EINVAL;
 231         }
 232
 233         /*
 234          * If anything is missing, assume signal voltage is fixed at
 235          * 3.3V and succeed/fail accordingly.
 236          */
 237         if (IS_ERR(priv->pinctrl) || IS_ERR(pin_state))
 238                 return ios->signal_voltage ==
 239                         MMC_SIGNAL_VOLTAGE_330 ? 0 : -EINVAL;
 240
 241         ret = mmc_regulator_set_vqmmc(host->mmc, ios);
 242         if (ret)
 243                 return ret;
 244
 245         return pinctrl_select_state(priv->pinctrl, pin_state);
 246 }
 247
 248 /* SCC registers */
 249 #define SH_MOBILE_SDHI_SCC_DTCNTL       0x000
 250 #define SH_MOBILE_SDHI_SCC_TAPSET       0x002
 251 #define SH_MOBILE_SDHI_SCC_DT2FF        0x004
 252 #define SH_MOBILE_SDHI_SCC_CKSEL        0x006
 253 #define SH_MOBILE_SDHI_SCC_RVSCNTL      0x008
 254 #define SH_MOBILE_SDHI_SCC_RVSREQ       0x00A
 255 #define SH_MOBILE_SDHI_SCC_TMPPORT2     0x00E
 256
 257 /* Definitions for values the SH_MOBILE_SDHI_SCC_DTCNTL register */
 258 #define SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN         BIT(0)
 259 #define SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT  16
 260 #define SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_MASK   0xff
 261
 262 /* Definitions for values the SH_MOBILE_SDHI_SCC_CKSEL register */
 263 #define SH_MOBILE_SDHI_SCC_CKSEL_DTSEL          BIT(0)
 264 /* Definitions for values the SH_MOBILE_SDHI_SCC_RVSCNTL register */
 265 #define SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN        BIT(0)
 266 /* Definitions for values the SH_MOBILE_SDHI_SCC_RVSREQ register */
 267 #define SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR        BIT(2)
 268 /* Definitions for values the SH_MOBILE_SDHI_SCC_TMPPORT2 register */
 269 #define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL   BIT(4)
 270 #define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN     BIT(31)
 271
 272 static inline u32 sd_scc_read32(struct tmio_mmc_host *host,
 273                                 struct renesas_sdhi *priv, int addr)
 274 {
 275         return readl(priv->scc_ctl + (addr << host->bus_shift));
 276 }
 277
 278 static inline void sd_scc_write32(struct tmio_mmc_host *host,
 279                                   struct renesas_sdhi *priv,
 280                                   int addr, u32 val)
 281 {
 282         writel(val, priv->scc_ctl + (addr << host->bus_shift));
 283 }
 284
 285 static unsigned int renesas_sdhi_init_tuning(struct tmio_mmc_host *host)
 286 {
 287         struct renesas_sdhi *priv;
 288
 289         priv = host_to_priv(host);
 290
 291         /* Initialize SCC */
 292         sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, 0x0);
 293
 294         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
 295                         sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
 296
 297         /* set sampling clock selection range */
 298         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
 299                        SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN |
 300                        0x8 << SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT);
 301
 302         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL,
 303                        SH_MOBILE_SDHI_SCC_CKSEL_DTSEL |
 304                        sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL));
 305
 306         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
 307                        ~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &
 308                        sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
 309
 310         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, priv->scc_tappos);
 311
 312         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
 313                         sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
 314
 315         /* Read TAPNUM */
 316         return (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL) >>
 317                 SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT) &
 318                 SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_MASK;
 319 }
 320
 321 static void renesas_sdhi_prepare_tuning(struct tmio_mmc_host *host,
 322                                         unsigned long tap)
 323 {
 324         struct renesas_sdhi *priv = host_to_priv(host);
 325
 326         /* Set sampling clock position */
 327         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, tap);
 328 }
 329
 330 static void renesas_sdhi_hs400_complete(struct tmio_mmc_host *host)
 331 {
 332         struct renesas_sdhi *priv = host_to_priv(host);
 333
 334         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
 335                 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
 336
 337         /* Set HS400 mode */
 338         sd_ctrl_write16(host, CTL_SDIF_MODE, 0x0001 |
 339                         sd_ctrl_read16(host, CTL_SDIF_MODE));
 340
 341         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF,
 342                        priv->scc_tappos_hs400);
 343
 344         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2,
 345                        (SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN |
 346                         SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) |
 347                         sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2));
 348
 349         /* Set the sampling clock selection range of HS400 mode */
 350         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
 351                        SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN |
 352                        0x4 << SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT);
 353
 354
 355         if (host->pdata->flags & TMIO_MMC_HAVE_4TAP_HS400)
 356                 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET,
 357                                host->tap_set / 2);
 358
 359         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL,
 360                        SH_MOBILE_SDHI_SCC_CKSEL_DTSEL |
 361                        sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL));
 362
 363         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
 364                         sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
 365 }
 366
 367 static void renesas_sdhi_reset_scc(struct tmio_mmc_host *host,
 368                                    struct renesas_sdhi *priv)
 369 {
 370         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
 371                         sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
 372
 373         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL,
 374                        ~SH_MOBILE_SDHI_SCC_CKSEL_DTSEL &
 375                        sd_scc_read32(host, priv,
 376                                      SH_MOBILE_SDHI_SCC_CKSEL));
 377 }
 378
 379 static void renesas_sdhi_disable_scc(struct tmio_mmc_host *host)
 380 {
 381         struct renesas_sdhi *priv = host_to_priv(host);
 382
 383         renesas_sdhi_reset_scc(host, priv);
 384
 385         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
 386                        ~SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN &
 387                        sd_scc_read32(host, priv,
 388                                      SH_MOBILE_SDHI_SCC_DTCNTL));
 389
 390         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
 391                         sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
 392 }
 393
 394 static void renesas_sdhi_reset_hs400_mode(struct tmio_mmc_host *host,
 395                                           struct renesas_sdhi *priv)
 396 {
 397         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
 398                         sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
 399
 400         /* Reset HS400 mode */
 401         sd_ctrl_write16(host, CTL_SDIF_MODE, ~0x0001 &
 402                         sd_ctrl_read16(host, CTL_SDIF_MODE));
 403
 404         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, priv->scc_tappos);
 405
 406         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2,
 407                        ~(SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN |
 408                          SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) &
 409                         sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2));
 410
 411         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
 412                         sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
 413 }
 414
 415 static void renesas_sdhi_prepare_hs400_tuning(struct tmio_mmc_host *host)
 416 {
 417         renesas_sdhi_reset_hs400_mode(host, host_to_priv(host));
 418 }
 419
 420 #define SH_MOBILE_SDHI_MAX_TAP 3
 421
 422 static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host)
 423 {
 424         struct renesas_sdhi *priv = host_to_priv(host);
 425         unsigned long tap_cnt;  /* counter of tuning success */
 426         unsigned long tap_start;/* start position of tuning success */
 427         unsigned long tap_end;  /* end position of tuning success */
 428         unsigned long ntap;     /* temporary counter of tuning success */
 429         unsigned long i;
 430
 431         /* Clear SCC_RVSREQ */
 432         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
 433
 434         /*
 435          * When tuning CMD19 is issued twice for each tap, merge the
 436          * result requiring the tap to be good in both runs before
 437          * considering it for tuning selection.
 438          */
 439         for (i = 0; i < host->tap_num * 2; i++) {
 440                 int offset = host->tap_num * (i < host->tap_num ? 1 : -1);
 441
 442                 if (!test_bit(i, host->taps))
 443                         clear_bit(i + offset, host->taps);
 444         }
 445
 446         /*
 447          * Find the longest consecutive run of successful probes.  If that
 448          * is more than SH_MOBILE_SDHI_MAX_TAP probes long then use the
 449          * center index as the tap.
 450          */
 451         tap_cnt = 0;
 452         ntap = 0;
 453         tap_start = 0;
 454         tap_end = 0;
 455         for (i = 0; i < host->tap_num * 2; i++) {
 456                 if (test_bit(i, host->taps)) {
 457                         ntap++;
 458                 } else {
 459                         if (ntap > tap_cnt) {
 460                                 tap_start = i - ntap;
 461                                 tap_end = i - 1;
 462                                 tap_cnt = ntap;
 463                         }
 464                         ntap = 0;
 465                 }
 466         }
 467
 468         if (ntap > tap_cnt) {
 469                 tap_start = i - ntap;
 470                 tap_end = i - 1;
 471                 tap_cnt = ntap;
 472         }
 473
 474         if (tap_cnt >= SH_MOBILE_SDHI_MAX_TAP)
 475                 host->tap_set = (tap_start + tap_end) / 2 % host->tap_num;
 476         else
 477                 return -EIO;
 478
 479         /* Set SCC */
 480         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, host->tap_set);
 481
 482         /* Enable auto re-tuning */
 483         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
 484                        SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN |
 485                        sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
 486
 487         return 0;
 488 }
 489
 490 static bool renesas_sdhi_check_scc_error(struct tmio_mmc_host *host)
 491 {
 492         struct renesas_sdhi *priv = host_to_priv(host);
 493         bool use_4tap = host->pdata->flags & TMIO_MMC_HAVE_4TAP_HS400;
 494
 495         /*
 496          * Skip checking SCC errors when running on 4 taps in HS400 mode as
 497          * any retuning would still result in the same 4 taps being used.
 498          */
 499         if (!(host->mmc->ios.timing == MMC_TIMING_UHS_SDR104) &&
 500             !(host->mmc->ios.timing == MMC_TIMING_MMC_HS200) &&
 501             !(host->mmc->ios.timing == MMC_TIMING_MMC_HS400 && !use_4tap))
 502                 return false;
 503
 504         if (mmc_doing_retune(host->mmc))
 505                 return false;
 506
 507         /* Check SCC error */
 508         if (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL) &
 509             SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &&
 510             sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ) &
 511             SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR) {
 512                 /* Clear SCC error */
 513                 sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
 514                 return true;
 515         }
 516
 517         return false;
 518 }
 519
 520 static void renesas_sdhi_hw_reset(struct tmio_mmc_host *host)
 521 {
 522         struct renesas_sdhi *priv;
 523
 524         priv = host_to_priv(host);
 525
 526         renesas_sdhi_reset_scc(host, priv);
 527         renesas_sdhi_reset_hs400_mode(host, priv);
 528
 529         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
 530                         sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
 531
 532         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
 533                        ~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &
 534                        sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
 535
 536         sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
 537                        ~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &
 538                        sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
 539
 540         if (host->pdata->flags & TMIO_MMC_MIN_RCAR2)
 541                 sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK,
 542                                              TMIO_MASK_INIT_RCAR2);
 543 }
 544
 545 static int renesas_sdhi_wait_idle(struct tmio_mmc_host *host, u32 bit)
 546 {
 547         int timeout = 1000;
 548         /* CBSY is set when busy, SCLKDIVEN is cleared when busy */
 549         u32 wait_state = (bit == TMIO_STAT_CMD_BUSY ? TMIO_STAT_CMD_BUSY : 0);
 550
 551         while (--timeout && (sd_ctrl_read16_and_16_as_32(host, CTL_STATUS)
 552                               & bit) == wait_state)
 553                 udelay(1);
 554
 555         if (!timeout) {
 556                 dev_warn(&host->pdev->dev, "timeout waiting for SD bus idle\n");
 557                 return -EBUSY;
 558         }
 559
 560         return 0;
 561 }
 562
 563 static int renesas_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
 564 {
 565         u32 bit = TMIO_STAT_SCLKDIVEN;
 566
 567         switch (addr) {
 568         case CTL_SD_CMD:
 569         case CTL_STOP_INTERNAL_ACTION:
 570         case CTL_XFER_BLK_COUNT:
 571         case CTL_SD_XFER_LEN:
 572         case CTL_SD_MEM_CARD_OPT:
 573         case CTL_TRANSACTION_CTL:
 574         case CTL_DMA_ENABLE:
 575         case HOST_MODE:
 576                 if (host->pdata->flags & TMIO_MMC_HAVE_CBSY)
 577                         bit = TMIO_STAT_CMD_BUSY;
 578                 /* fallthrough */
 579         case CTL_SD_CARD_CLK_CTL:
 580                 return renesas_sdhi_wait_idle(host, bit);
 581         }
 582
 583         return 0;
 584 }
 585
 586 static int renesas_sdhi_multi_io_quirk(struct mmc_card *card,
 587                                        unsigned int direction, int blk_size)
 588 {
 589         /*
 590          * In Renesas controllers, when performing a
 591          * multiple block read of one or two blocks,
 592          * depending on the timing with which the
 593          * response register is read, the response
 594          * value may not be read properly.
 595          * Use single block read for this HW bug
 596          */
 597         if ((direction == MMC_DATA_READ) &&
 598             blk_size == 2)
 599                 return 1;
 600
 601         return blk_size;
 602 }
 603
 604 static void renesas_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
 605 {
 606         /* Iff regs are 8 byte apart, sdbuf is 64 bit. Otherwise always 32. */
 607         int width = (host->bus_shift == 2) ? 64 : 32;
 608
 609         sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? DMA_ENABLE_DMASDRW : 0);
 610         renesas_sdhi_sdbuf_width(host, enable ? width : 16);
 611 }
 612
 613 static const struct renesas_sdhi_quirks sdhi_quirks_h3_m3w_es1 = {
 614         .hs400_disabled = true,
 615         .hs400_4taps = true,
 616 };
 617
 618 static const struct renesas_sdhi_quirks sdhi_quirks_h3_es2 = {
 619         .hs400_disabled = false,
 620         .hs400_4taps = true,
 621 };
 622
 623 static const struct soc_device_attribute sdhi_quirks_match[]  = {
 624         { .soc_id = "r8a7795", .revision = "ES1.*", .data = &sdhi_quirks_h3_m3w_es1 },
 625         { .soc_id = "r8a7795", .revision = "ES2.0", .data = &sdhi_quirks_h3_es2 },
 626         { .soc_id = "r8a7796", .revision = "ES1.0", .data = &sdhi_quirks_h3_m3w_es1 },
 627         { .soc_id = "r8a7796", .revision = "ES1.1", .data = &sdhi_quirks_h3_m3w_es1 },
 628         { /* Sentinel. */ },
 629 };
 630
 631 int renesas_sdhi_probe(struct platform_device *pdev,
 632                        const struct tmio_mmc_dma_ops *dma_ops)
 633 {
 634         struct tmio_mmc_data *mmd = pdev->dev.platform_data;
 635         const struct renesas_sdhi_quirks *quirks = NULL;
 636         const struct renesas_sdhi_of_data *of_data;
 637         const struct soc_device_attribute *attr;
 638         struct tmio_mmc_data *mmc_data;
 639         struct tmio_mmc_dma *dma_priv;
 640         struct tmio_mmc_host *host;
 641         struct renesas_sdhi *priv;
 642         struct resource *res;
 643         int irq, ret, i;
 644         u16 ver;
 645
 646         of_data = of_device_get_match_data(&pdev->dev);
 647
 648         attr = soc_device_match(sdhi_quirks_match);
 649         if (attr)
 650                 quirks = attr->data;
 651
 652         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 653         if (!res)
 654                 return -EINVAL;
 655
 656         priv = devm_kzalloc(&pdev->dev, sizeof(struct renesas_sdhi),
 657                             GFP_KERNEL);
 658         if (!priv)
 659                 return -ENOMEM;
 660
 661         mmc_data = &priv->mmc_data;
 662         dma_priv = &priv->dma_priv;
 663
 664         priv->clk = devm_clk_get(&pdev->dev, NULL);
 665         if (IS_ERR(priv->clk)) {
 666                 ret = PTR_ERR(priv->clk);
 667                 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
 668                 return ret;
 669         }
 670
 671         /*
 672          * Some controllers provide a 2nd clock just to run the internal card
 673          * detection logic. Unfortunately, the existing driver architecture does
 674          * not support a separation of clocks for runtime PM usage. When
 675          * native hotplug is used, the tmio driver assumes that the core
 676          * must continue to run for card detect to stay active, so we cannot
 677          * disable it.
 678          * Additionally, it is prohibited to supply a clock to the core but not
 679          * to the card detect circuit. That leaves us with if separate clocks
 680          * are presented, we must treat them both as virtually 1 clock.
 681          */
 682         priv->clk_cd = devm_clk_get(&pdev->dev, "cd");
 683         if (IS_ERR(priv->clk_cd))
 684                 priv->clk_cd = NULL;
 685
 686         priv->pinctrl = devm_pinctrl_get(&pdev->dev);
 687         if (!IS_ERR(priv->pinctrl)) {
 688                 priv->pins_default = pinctrl_lookup_state(priv->pinctrl,
 689                                                 PINCTRL_STATE_DEFAULT);
 690                 priv->pins_uhs = pinctrl_lookup_state(priv->pinctrl,
 691                                                 "state_uhs");
 692         }
 693
 694         host = tmio_mmc_host_alloc(pdev, mmc_data);
 695         if (IS_ERR(host))
 696                 return PTR_ERR(host);
 697
 698         if (of_data) {
 699                 mmc_data->flags |= of_data->tmio_flags;
 700                 mmc_data->ocr_mask = of_data->tmio_ocr_mask;
 701                 mmc_data->capabilities |= of_data->capabilities;
 702                 mmc_data->capabilities2 |= of_data->capabilities2;
 703                 mmc_data->dma_rx_offset = of_data->dma_rx_offset;
 704                 mmc_data->max_blk_count = of_data->max_blk_count;
 705                 mmc_data->max_segs = of_data->max_segs;
 706                 dma_priv->dma_buswidth = of_data->dma_buswidth;
 707                 host->bus_shift = of_data->bus_shift;
 708         }
 709
 710         host->write16_hook      = renesas_sdhi_write16_hook;
 711         host->clk_enable        = renesas_sdhi_clk_enable;
 712         host->clk_disable       = renesas_sdhi_clk_disable;
 713         host->set_clock         = renesas_sdhi_set_clock;
 714         host->multi_io_quirk    = renesas_sdhi_multi_io_quirk;
 715         host->dma_ops           = dma_ops;
 716
 717         if (quirks && quirks->hs400_disabled)
 718                 host->mmc->caps2 &= ~(MMC_CAP2_HS400 | MMC_CAP2_HS400_ES);
 719
 720         if (quirks && quirks->hs400_4taps)
 721                 mmc_data->flags |= TMIO_MMC_HAVE_4TAP_HS400;
 722
 723         /* For some SoC, we disable internal WP. GPIO may override this */
 724         if (mmc_can_gpio_ro(host->mmc))
 725                 mmc_data->capabilities2 &= ~MMC_CAP2_NO_WRITE_PROTECT;
 726
 727         /* SDR speeds are only available on Gen2+ */
 728         if (mmc_data->flags & TMIO_MMC_MIN_RCAR2) {
 729                 /* card_busy caused issues on r8a73a4 (pre-Gen2) CD-less SDHI */
 730                 host->ops.card_busy = renesas_sdhi_card_busy;
 731                 host->ops.start_signal_voltage_switch =
 732                         renesas_sdhi_start_signal_voltage_switch;
 733                 host->sdcard_irq_setbit_mask = TMIO_STAT_ALWAYS_SET_27;
 734
 735                 /* SDR and HS200/400 registers requires HW reset */
 736                 if (of_data && of_data->scc_offset) {
 737                         priv->scc_ctl = host->ctl + of_data->scc_offset;
 738                         host->mmc->caps |= MMC_CAP_HW_RESET;
 739                         host->hw_reset = renesas_sdhi_hw_reset;
 740                 }
 741         }
 742
 743         /* Orginally registers were 16 bit apart, could be 32 or 64 nowadays */
 744         if (!host->bus_shift && resource_size(res) > 0x100) /* old way to determine the shift */
 745                 host->bus_shift = 1;
 746
 747         if (mmd)
 748                 *mmc_data = *mmd;
 749
 750         dma_priv->filter = shdma_chan_filter;
 751         dma_priv->enable = renesas_sdhi_enable_dma;
 752
 753         mmc_data->alignment_shift = 1; /* 2-byte alignment */
 754         mmc_data->capabilities |= MMC_CAP_MMC_HIGHSPEED;
 755
 756         /*
 757          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
 758          * bus width mode.
 759          */
 760         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
 761
 762         /*
 763          * All SDHI blocks support SDIO IRQ signalling.
 764          */
 765         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
 766
 767         /* All SDHI have CMD12 control bit */
 768         mmc_data->flags |= TMIO_MMC_HAVE_CMD12_CTRL;
 769
 770         /* All SDHI have SDIO status bits which must be 1 */
 771         mmc_data->flags |= TMIO_MMC_SDIO_STATUS_SETBITS;
 772
 773         ret = renesas_sdhi_clk_enable(host);
 774         if (ret)
 775                 goto efree;
 776
 777         ver = sd_ctrl_read16(host, CTL_VERSION);
 778         /* GEN2_SDR104 is first known SDHI to use 32bit block count */
 779         if (ver < SDHI_VER_GEN2_SDR104 && mmc_data->max_blk_count > U16_MAX)
 780                 mmc_data->max_blk_count = U16_MAX;
 781
 782         ret = tmio_mmc_host_probe(host);
 783         if (ret < 0)
 784                 goto edisclk;
 785
 786         /* One Gen2 SDHI incarnation does NOT have a CBSY bit */
 787         if (ver == SDHI_VER_GEN2_SDR50)
 788                 mmc_data->flags &= ~TMIO_MMC_HAVE_CBSY;
 789
 790         /* Enable tuning iff we have an SCC and a supported mode */
 791         if (of_data && of_data->scc_offset &&
 792             (host->mmc->caps & MMC_CAP_UHS_SDR104 ||
 793              host->mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR |
 794                                  MMC_CAP2_HS400_1_8V))) {
 795                 const struct renesas_sdhi_scc *taps = of_data->taps;
 796                 bool hit = false;
 797
 798                 for (i = 0; i < of_data->taps_num; i++) {
 799                         if (taps[i].clk_rate == 0 ||
 800                             taps[i].clk_rate == host->mmc->f_max) {
 801                                 priv->scc_tappos = taps->tap;
 802                                 priv->scc_tappos_hs400 = taps->tap_hs400;
 803                                 hit = true;
 804                                 break;
 805                         }
 806                 }
 807
 808                 if (!hit)
 809                         dev_warn(&host->pdev->dev, "Unknown clock rate for SDR104\n");
 810
 811                 host->init_tuning = renesas_sdhi_init_tuning;
 812                 host->prepare_tuning = renesas_sdhi_prepare_tuning;
 813                 host->select_tuning = renesas_sdhi_select_tuning;
 814                 host->check_scc_error = renesas_sdhi_check_scc_error;
 815                 host->prepare_hs400_tuning =
 816                         renesas_sdhi_prepare_hs400_tuning;
 817                 host->hs400_downgrade = renesas_sdhi_disable_scc;
 818                 host->hs400_complete = renesas_sdhi_hs400_complete;
 819         }
 820
 821         i = 0;
 822         while (1) {
 823                 irq = platform_get_irq(pdev, i);
 824                 if (irq < 0)
 825                         break;
 826                 i++;
 827                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
 828                                        dev_name(&pdev->dev), host);
 829                 if (ret)
 830                         goto eirq;
 831         }
 832
 833         /* There must be at least one IRQ source */
 834         if (!i) {
 835                 ret = irq;
 836                 goto eirq;
 837         }
 838
 839         dev_info(&pdev->dev, "%s base at 0x%08lx max clock rate %u MHz\n",
 840                  mmc_hostname(host->mmc), (unsigned long)
 841                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
 842                  host->mmc->f_max / 1000000);
 843
 844         return ret;
 845
 846 eirq:
 847         tmio_mmc_host_remove(host);
 848 edisclk:
 849         renesas_sdhi_clk_disable(host);
 850 efree:
 851         tmio_mmc_host_free(host);
 852
 853         return ret;
 854 }
 855 EXPORT_SYMBOL_GPL(renesas_sdhi_probe);
 856
 857 int renesas_sdhi_remove(struct platform_device *pdev)
 858 {
 859         struct tmio_mmc_host *host = platform_get_drvdata(pdev);
 860
 861         tmio_mmc_host_remove(host);
 862         renesas_sdhi_clk_disable(host);
 863
 864         return 0;
 865 }
 866 EXPORT_SYMBOL_GPL(renesas_sdhi_remove);
 867
 868 MODULE_LICENSE("GPL v2");