drivers/mmc/host/sdhci_am654.c

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