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