drivers/mmc/host/mmci_stm32_sdmmc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) STMicroelectronics 2018 - All Rights Reserved
   4  * Author: Ludovic.barre@st.com for STMicroelectronics.
   5  */
   6 #include <linux/bitfield.h>
   7 #include <linux/delay.h>
   8 #include <linux/dma-mapping.h>
   9 #include <linux/iopoll.h>
  10 #include <linux/mmc/host.h>
  11 #include <linux/mmc/card.h>
  12 #include <linux/of_address.h>
  13 #include <linux/reset.h>
  14 #include <linux/scatterlist.h>
  15 #include "mmci.h"
  16
  17 #define SDMMC_LLI_BUF_LEN       PAGE_SIZE
  18
  19 #define DLYB_CR                 0x0
  20 #define DLYB_CR_DEN             BIT(0)
  21 #define DLYB_CR_SEN             BIT(1)
  22
  23 #define DLYB_CFGR               0x4
  24 #define DLYB_CFGR_SEL_MASK      GENMASK(3, 0)
  25 #define DLYB_CFGR_UNIT_MASK     GENMASK(14, 8)
  26 #define DLYB_CFGR_LNG_MASK      GENMASK(27, 16)
  27 #define DLYB_CFGR_LNGF          BIT(31)
  28
  29 #define DLYB_NB_DELAY           11
  30 #define DLYB_CFGR_SEL_MAX       (DLYB_NB_DELAY + 1)
  31 #define DLYB_CFGR_UNIT_MAX      127
  32
  33 #define DLYB_LNG_TIMEOUT_US     1000
  34 #define SDMMC_VSWEND_TIMEOUT_US 10000
  35
  36 #define SYSCFG_DLYBSD_CR        0x0
  37 #define DLYBSD_CR_EN            BIT(0)
  38 #define DLYBSD_CR_RXTAPSEL_MASK GENMASK(6, 1)
  39 #define DLYBSD_TAPSEL_NB        32
  40 #define DLYBSD_BYP_EN           BIT(16)
  41 #define DLYBSD_BYP_CMD          GENMASK(21, 17)
  42 #define DLYBSD_ANTIGLITCH_EN    BIT(22)
  43
  44 #define SYSCFG_DLYBSD_SR        0x4
  45 #define DLYBSD_SR_LOCK          BIT(0)
  46 #define DLYBSD_SR_RXTAPSEL_ACK  BIT(1)
  47
  48 #define DLYBSD_TIMEOUT_1S_IN_US 1000000
  49
  50 struct sdmmc_lli_desc {
  51         u32 idmalar;
  52         u32 idmabase;
  53         u32 idmasize;
  54 };
  55
  56 struct sdmmc_idma {
  57         dma_addr_t sg_dma;
  58         void *sg_cpu;
  59         dma_addr_t bounce_dma_addr;
  60         void *bounce_buf;
  61         bool use_bounce_buffer;
  62 };
  63
  64 struct sdmmc_dlyb;
  65
  66 struct sdmmc_tuning_ops {
  67         int (*dlyb_enable)(struct sdmmc_dlyb *dlyb);
  68         void (*set_input_ck)(struct sdmmc_dlyb *dlyb);
  69         int (*tuning_prepare)(struct mmci_host *host);
  70         int (*set_cfg)(struct sdmmc_dlyb *dlyb, int unit __maybe_unused,
  71                        int phase, bool sampler __maybe_unused);
  72 };
  73
  74 struct sdmmc_dlyb {
  75         void __iomem *base;
  76         u32 unit;
  77         u32 max;
  78         struct sdmmc_tuning_ops *ops;
  79 };
  80
  81 static int sdmmc_idma_validate_data(struct mmci_host *host,
  82                                     struct mmc_data *data)
  83 {
  84         struct sdmmc_idma *idma = host->dma_priv;
  85         struct device *dev = mmc_dev(host->mmc);
  86         struct scatterlist *sg;
  87         int i;
  88
  89         /*
  90          * idma has constraints on idmabase & idmasize for each element
  91          * excepted the last element which has no constraint on idmasize
  92          */
  93         idma->use_bounce_buffer = false;
  94         for_each_sg(data->sg, sg, data->sg_len - 1, i) {
  95                 if (!IS_ALIGNED(sg->offset, sizeof(u32)) ||
  96                     !IS_ALIGNED(sg->length,
  97                                 host->variant->stm32_idmabsize_align)) {
  98                         dev_dbg(mmc_dev(host->mmc),
  99                                 "unaligned scatterlist: ofst:%x length:%d\n",
 100                                 data->sg->offset, data->sg->length);
 101                         goto use_bounce_buffer;
 102                 }
 103         }
 104
 105         if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
 106                 dev_dbg(mmc_dev(host->mmc),
 107                         "unaligned last scatterlist: ofst:%x length:%d\n",
 108                         data->sg->offset, data->sg->length);
 109                 goto use_bounce_buffer;
 110         }
 111
 112         return 0;
 113
 114 use_bounce_buffer:
 115         if (!idma->bounce_buf) {
 116                 idma->bounce_buf = dmam_alloc_coherent(dev,
 117                                                        host->mmc->max_req_size,
 118                                                        &idma->bounce_dma_addr,
 119                                                        GFP_KERNEL);
 120                 if (!idma->bounce_buf) {
 121                         dev_err(dev, "Unable to map allocate DMA bounce buffer.\n");
 122                         return -ENOMEM;
 123                 }
 124         }
 125
 126         idma->use_bounce_buffer = true;
 127
 128         return 0;
 129 }
 130
 131 static int _sdmmc_idma_prep_data(struct mmci_host *host,
 132                                  struct mmc_data *data)
 133 {
 134         struct sdmmc_idma *idma = host->dma_priv;
 135
 136         if (idma->use_bounce_buffer) {
 137                 if (data->flags & MMC_DATA_WRITE) {
 138                         unsigned int xfer_bytes = data->blksz * data->blocks;
 139
 140                         sg_copy_to_buffer(data->sg, data->sg_len,
 141                                           idma->bounce_buf, xfer_bytes);
 142                         dma_wmb();
 143                 }
 144         } else {
 145                 int n_elem;
 146
 147                 n_elem = dma_map_sg(mmc_dev(host->mmc),
 148                                     data->sg,
 149                                     data->sg_len,
 150                                     mmc_get_dma_dir(data));
 151
 152                 if (!n_elem) {
 153                         dev_err(mmc_dev(host->mmc), "dma_map_sg failed\n");
 154                         return -EINVAL;
 155                 }
 156         }
 157         return 0;
 158 }
 159
 160 static int sdmmc_idma_prep_data(struct mmci_host *host,
 161                                 struct mmc_data *data, bool next)
 162 {
 163         /* Check if job is already prepared. */
 164         if (!next && data->host_cookie == host->next_cookie)
 165                 return 0;
 166
 167         return _sdmmc_idma_prep_data(host, data);
 168 }
 169
 170 static void sdmmc_idma_unprep_data(struct mmci_host *host,
 171                                    struct mmc_data *data, int err)
 172 {
 173         struct sdmmc_idma *idma = host->dma_priv;
 174
 175         if (idma->use_bounce_buffer) {
 176                 if (data->flags & MMC_DATA_READ) {
 177                         unsigned int xfer_bytes = data->blksz * data->blocks;
 178
 179                         sg_copy_from_buffer(data->sg, data->sg_len,
 180                                             idma->bounce_buf, xfer_bytes);
 181                 }
 182         } else {
 183                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 184                              mmc_get_dma_dir(data));
 185         }
 186 }
 187
 188 static int sdmmc_idma_setup(struct mmci_host *host)
 189 {
 190         struct sdmmc_idma *idma;
 191         struct device *dev = mmc_dev(host->mmc);
 192
 193         idma = devm_kzalloc(dev, sizeof(*idma), GFP_KERNEL);
 194         if (!idma)
 195                 return -ENOMEM;
 196
 197         host->dma_priv = idma;
 198
 199         if (host->variant->dma_lli) {
 200                 idma->sg_cpu = dmam_alloc_coherent(dev, SDMMC_LLI_BUF_LEN,
 201                                                    &idma->sg_dma, GFP_KERNEL);
 202                 if (!idma->sg_cpu) {
 203                         dev_err(dev, "Failed to alloc IDMA descriptor\n");
 204                         return -ENOMEM;
 205                 }
 206                 host->mmc->max_segs = SDMMC_LLI_BUF_LEN /
 207                         sizeof(struct sdmmc_lli_desc);
 208                 host->mmc->max_seg_size = host->variant->stm32_idmabsize_mask;
 209
 210                 host->mmc->max_req_size = SZ_1M;
 211         } else {
 212                 host->mmc->max_segs = 1;
 213                 host->mmc->max_seg_size = host->mmc->max_req_size;
 214         }
 215
 216         return dma_set_max_seg_size(dev, host->mmc->max_seg_size);
 217 }
 218
 219 static int sdmmc_idma_start(struct mmci_host *host, unsigned int *datactrl)
 220
 221 {
 222         struct sdmmc_idma *idma = host->dma_priv;
 223         struct sdmmc_lli_desc *desc = (struct sdmmc_lli_desc *)idma->sg_cpu;
 224         struct mmc_data *data = host->data;
 225         struct scatterlist *sg;
 226         int i;
 227
 228         if (!host->variant->dma_lli || data->sg_len == 1 ||
 229             idma->use_bounce_buffer) {
 230                 u32 dma_addr;
 231
 232                 if (idma->use_bounce_buffer)
 233                         dma_addr = idma->bounce_dma_addr;
 234                 else
 235                         dma_addr = sg_dma_address(data->sg);
 236
 237                 writel_relaxed(dma_addr,
 238                                host->base + MMCI_STM32_IDMABASE0R);
 239                 writel_relaxed(MMCI_STM32_IDMAEN,
 240                                host->base + MMCI_STM32_IDMACTRLR);
 241                 return 0;
 242         }
 243
 244         for_each_sg(data->sg, sg, data->sg_len, i) {
 245                 desc[i].idmalar = (i + 1) * sizeof(struct sdmmc_lli_desc);
 246                 desc[i].idmalar |= MMCI_STM32_ULA | MMCI_STM32_ULS
 247                         | MMCI_STM32_ABR;
 248                 desc[i].idmabase = sg_dma_address(sg);
 249                 desc[i].idmasize = sg_dma_len(sg);
 250         }
 251
 252         /* notice the end of link list */
 253         desc[data->sg_len - 1].idmalar &= ~MMCI_STM32_ULA;
 254
 255         dma_wmb();
 256         writel_relaxed(idma->sg_dma, host->base + MMCI_STM32_IDMABAR);
 257         writel_relaxed(desc[0].idmalar, host->base + MMCI_STM32_IDMALAR);
 258         writel_relaxed(desc[0].idmabase, host->base + MMCI_STM32_IDMABASE0R);
 259         writel_relaxed(desc[0].idmasize, host->base + MMCI_STM32_IDMABSIZER);
 260         writel_relaxed(MMCI_STM32_IDMAEN | MMCI_STM32_IDMALLIEN,
 261                        host->base + MMCI_STM32_IDMACTRLR);
 262
 263         return 0;
 264 }
 265
 266 static void sdmmc_idma_finalize(struct mmci_host *host, struct mmc_data *data)
 267 {
 268         writel_relaxed(0, host->base + MMCI_STM32_IDMACTRLR);
 269
 270         if (!data->host_cookie)
 271                 sdmmc_idma_unprep_data(host, data, 0);
 272 }
 273
 274 static void mmci_sdmmc_set_clkreg(struct mmci_host *host, unsigned int desired)
 275 {
 276         unsigned int clk = 0, ddr = 0;
 277
 278         if (host->mmc->ios.timing == MMC_TIMING_MMC_DDR52 ||
 279             host->mmc->ios.timing == MMC_TIMING_UHS_DDR50)
 280                 ddr = MCI_STM32_CLK_DDR;
 281
 282         /*
 283          * cclk = mclk / (2 * clkdiv)
 284          * clkdiv 0 => bypass
 285          * in ddr mode bypass is not possible
 286          */
 287         if (desired) {
 288                 if (desired >= host->mclk && !ddr) {
 289                         host->cclk = host->mclk;
 290                 } else {
 291                         clk = DIV_ROUND_UP(host->mclk, 2 * desired);
 292                         if (clk > MCI_STM32_CLK_CLKDIV_MSK)
 293                                 clk = MCI_STM32_CLK_CLKDIV_MSK;
 294                         host->cclk = host->mclk / (2 * clk);
 295                 }
 296         } else {
 297                 /*
 298                  * while power-on phase the clock can't be define to 0,
 299                  * Only power-off and power-cyc deactivate the clock.
 300                  * if desired clock is 0, set max divider
 301                  */
 302                 clk = MCI_STM32_CLK_CLKDIV_MSK;
 303                 host->cclk = host->mclk / (2 * clk);
 304         }
 305
 306         /* Set actual clock for debug */
 307         if (host->mmc->ios.power_mode == MMC_POWER_ON)
 308                 host->mmc->actual_clock = host->cclk;
 309         else
 310                 host->mmc->actual_clock = 0;
 311
 312         if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)
 313                 clk |= MCI_STM32_CLK_WIDEBUS_4;
 314         if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8)
 315                 clk |= MCI_STM32_CLK_WIDEBUS_8;
 316
 317         clk |= MCI_STM32_CLK_HWFCEN;
 318         clk |= host->clk_reg_add;
 319         clk |= ddr;
 320
 321         if (host->mmc->ios.timing >= MMC_TIMING_UHS_SDR50)
 322                 clk |= MCI_STM32_CLK_BUSSPEED;
 323
 324         mmci_write_clkreg(host, clk);
 325 }
 326
 327 static void sdmmc_dlyb_mp15_input_ck(struct sdmmc_dlyb *dlyb)
 328 {
 329         if (!dlyb || !dlyb->base)
 330                 return;
 331
 332         /* Output clock = Input clock */
 333         writel_relaxed(0, dlyb->base + DLYB_CR);
 334 }
 335
 336 static void mmci_sdmmc_set_pwrreg(struct mmci_host *host, unsigned int pwr)
 337 {
 338         struct mmc_ios ios = host->mmc->ios;
 339         struct sdmmc_dlyb *dlyb = host->variant_priv;
 340
 341         /* adds OF options */
 342         pwr = host->pwr_reg_add;
 343
 344         if (dlyb && dlyb->ops->set_input_ck)
 345                 dlyb->ops->set_input_ck(dlyb);
 346
 347         if (ios.power_mode == MMC_POWER_OFF) {
 348                 /* Only a reset could power-off sdmmc */
 349                 reset_control_assert(host->rst);
 350                 udelay(2);
 351                 reset_control_deassert(host->rst);
 352
 353                 /*
 354                  * Set the SDMMC in Power-cycle state.
 355                  * This will make that the SDMMC_D[7:0], SDMMC_CMD and SDMMC_CK
 356                  * are driven low, to prevent the Card from being supplied
 357                  * through the signal lines.
 358                  */
 359                 mmci_write_pwrreg(host, MCI_STM32_PWR_CYC | pwr);
 360         } else if (ios.power_mode == MMC_POWER_ON) {
 361                 /*
 362                  * After power-off (reset): the irq mask defined in probe
 363                  * functionis lost
 364                  * ault irq mask (probe) must be activated
 365                  */
 366                 writel(MCI_IRQENABLE | host->variant->start_err,
 367                        host->base + MMCIMASK0);
 368
 369                 /* preserves voltage switch bits */
 370                 pwr |= host->pwr_reg & (MCI_STM32_VSWITCHEN |
 371                                         MCI_STM32_VSWITCH);
 372
 373                 /*
 374                  * After a power-cycle state, we must set the SDMMC in
 375                  * Power-off. The SDMMC_D[7:0], SDMMC_CMD and SDMMC_CK are
 376                  * driven high. Then we can set the SDMMC to Power-on state
 377                  */
 378                 mmci_write_pwrreg(host, MCI_PWR_OFF | pwr);
 379                 mdelay(1);
 380                 mmci_write_pwrreg(host, MCI_PWR_ON | pwr);
 381         }
 382 }
 383
 384 static u32 sdmmc_get_dctrl_cfg(struct mmci_host *host)
 385 {
 386         u32 datactrl;
 387
 388         datactrl = mmci_dctrl_blksz(host);
 389
 390         if (host->hw_revision >= 3) {
 391                 u32 thr = 0;
 392
 393                 if (host->mmc->ios.timing == MMC_TIMING_UHS_SDR104 ||
 394                     host->mmc->ios.timing == MMC_TIMING_MMC_HS200) {
 395                         thr = ffs(min_t(unsigned int, host->data->blksz,
 396                                         host->variant->fifosize));
 397                         thr = min_t(u32, thr, MMCI_STM32_THR_MASK);
 398                 }
 399
 400                 writel_relaxed(thr, host->base + MMCI_STM32_FIFOTHRR);
 401         }
 402
 403         if (host->mmc->card && mmc_card_sdio(host->mmc->card) &&
 404             host->data->blocks == 1)
 405                 datactrl |= MCI_DPSM_STM32_MODE_SDIO;
 406         else if (host->data->stop && !host->mrq->sbc)
 407                 datactrl |= MCI_DPSM_STM32_MODE_BLOCK_STOP;
 408         else
 409                 datactrl |= MCI_DPSM_STM32_MODE_BLOCK;
 410
 411         return datactrl;
 412 }
 413
 414 static bool sdmmc_busy_complete(struct mmci_host *host, struct mmc_command *cmd,
 415                                 u32 status, u32 err_msk)
 416 {
 417         void __iomem *base = host->base;
 418         u32 busy_d0, busy_d0end, mask, sdmmc_status;
 419
 420         mask = readl_relaxed(base + MMCIMASK0);
 421         sdmmc_status = readl_relaxed(base + MMCISTATUS);
 422         busy_d0end = sdmmc_status & MCI_STM32_BUSYD0END;
 423         busy_d0 = sdmmc_status & MCI_STM32_BUSYD0;
 424
 425         /* complete if there is an error or busy_d0end */
 426         if ((status & err_msk) || busy_d0end)
 427                 goto complete;
 428
 429         /*
 430          * On response the busy signaling is reflected in the BUSYD0 flag.
 431          * if busy_d0 is in-progress we must activate busyd0end interrupt
 432          * to wait this completion. Else this request has no busy step.
 433          */
 434         if (busy_d0) {
 435                 if (!host->busy_status) {
 436                         writel_relaxed(mask | host->variant->busy_detect_mask,
 437                                        base + MMCIMASK0);
 438                         host->busy_status = status &
 439                                 (MCI_CMDSENT | MCI_CMDRESPEND);
 440                 }
 441                 return false;
 442         }
 443
 444 complete:
 445         if (host->busy_status) {
 446                 writel_relaxed(mask & ~host->variant->busy_detect_mask,
 447                                base + MMCIMASK0);
 448                 host->busy_status = 0;
 449         }
 450
 451         writel_relaxed(host->variant->busy_detect_mask, base + MMCICLEAR);
 452
 453         return true;
 454 }
 455
 456 static int sdmmc_dlyb_mp15_enable(struct sdmmc_dlyb *dlyb)
 457 {
 458         writel_relaxed(DLYB_CR_DEN, dlyb->base + DLYB_CR);
 459
 460         return 0;
 461 }
 462
 463 static int sdmmc_dlyb_mp15_set_cfg(struct sdmmc_dlyb *dlyb,
 464                                    int unit, int phase, bool sampler)
 465 {
 466         u32 cfgr;
 467
 468         writel_relaxed(DLYB_CR_SEN | DLYB_CR_DEN, dlyb->base + DLYB_CR);
 469
 470         cfgr = FIELD_PREP(DLYB_CFGR_UNIT_MASK, unit) |
 471                FIELD_PREP(DLYB_CFGR_SEL_MASK, phase);
 472         writel_relaxed(cfgr, dlyb->base + DLYB_CFGR);
 473
 474         if (!sampler)
 475                 writel_relaxed(DLYB_CR_DEN, dlyb->base + DLYB_CR);
 476
 477         return 0;
 478 }
 479
 480 static int sdmmc_dlyb_mp15_prepare(struct mmci_host *host)
 481 {
 482         struct sdmmc_dlyb *dlyb = host->variant_priv;
 483         u32 cfgr;
 484         int i, lng, ret;
 485
 486         for (i = 0; i <= DLYB_CFGR_UNIT_MAX; i++) {
 487                 dlyb->ops->set_cfg(dlyb, i, DLYB_CFGR_SEL_MAX, true);
 488
 489                 ret = readl_relaxed_poll_timeout(dlyb->base + DLYB_CFGR, cfgr,
 490                                                  (cfgr & DLYB_CFGR_LNGF),
 491                                                  1, DLYB_LNG_TIMEOUT_US);
 492                 if (ret) {
 493                         dev_warn(mmc_dev(host->mmc),
 494                                  "delay line cfg timeout unit:%d cfgr:%d\n",
 495                                  i, cfgr);
 496                         continue;
 497                 }
 498
 499                 lng = FIELD_GET(DLYB_CFGR_LNG_MASK, cfgr);
 500                 if (lng < BIT(DLYB_NB_DELAY) && lng > 0)
 501                         break;
 502         }
 503
 504         if (i > DLYB_CFGR_UNIT_MAX)
 505                 return -EINVAL;
 506
 507         dlyb->unit = i;
 508         dlyb->max = __fls(lng);
 509
 510         return 0;
 511 }
 512
 513 static int sdmmc_dlyb_mp25_enable(struct sdmmc_dlyb *dlyb)
 514 {
 515         u32 cr, sr;
 516
 517         cr = readl_relaxed(dlyb->base + SYSCFG_DLYBSD_CR);
 518         cr |= DLYBSD_CR_EN;
 519
 520         writel_relaxed(cr, dlyb->base + SYSCFG_DLYBSD_CR);
 521
 522         return readl_relaxed_poll_timeout(dlyb->base + SYSCFG_DLYBSD_SR,
 523                                            sr, sr & DLYBSD_SR_LOCK, 1,
 524                                            DLYBSD_TIMEOUT_1S_IN_US);
 525 }
 526
 527 static int sdmmc_dlyb_mp25_set_cfg(struct sdmmc_dlyb *dlyb,
 528                                    int unit __maybe_unused, int phase,
 529                                    bool sampler __maybe_unused)
 530 {
 531         u32 cr, sr;
 532
 533         cr = readl_relaxed(dlyb->base + SYSCFG_DLYBSD_CR);
 534         cr &= ~DLYBSD_CR_RXTAPSEL_MASK;
 535         cr |= FIELD_PREP(DLYBSD_CR_RXTAPSEL_MASK, phase);
 536
 537         writel_relaxed(cr, dlyb->base + SYSCFG_DLYBSD_CR);
 538
 539         return readl_relaxed_poll_timeout(dlyb->base + SYSCFG_DLYBSD_SR,
 540                                           sr, sr & DLYBSD_SR_RXTAPSEL_ACK, 1,
 541                                           DLYBSD_TIMEOUT_1S_IN_US);
 542 }
 543
 544 static int sdmmc_dlyb_mp25_prepare(struct mmci_host *host)
 545 {
 546         struct sdmmc_dlyb *dlyb = host->variant_priv;
 547
 548         dlyb->max = DLYBSD_TAPSEL_NB;
 549
 550         return 0;
 551 }
 552
 553 static int sdmmc_dlyb_phase_tuning(struct mmci_host *host, u32 opcode)
 554 {
 555         struct sdmmc_dlyb *dlyb = host->variant_priv;
 556         int cur_len = 0, max_len = 0, end_of_len = 0;
 557         int phase, ret;
 558
 559         for (phase = 0; phase <= dlyb->max; phase++) {
 560                 ret = dlyb->ops->set_cfg(dlyb, dlyb->unit, phase, false);
 561                 if (ret) {
 562                         dev_err(mmc_dev(host->mmc), "tuning config failed\n");
 563                         return ret;
 564                 }
 565
 566                 if (mmc_send_tuning(host->mmc, opcode, NULL)) {
 567                         cur_len = 0;
 568                 } else {
 569                         cur_len++;
 570                         if (cur_len > max_len) {
 571                                 max_len = cur_len;
 572                                 end_of_len = phase;
 573                         }
 574                 }
 575         }
 576
 577         if (!max_len) {
 578                 dev_err(mmc_dev(host->mmc), "no tuning point found\n");
 579                 return -EINVAL;
 580         }
 581
 582         if (dlyb->ops->set_input_ck)
 583                 dlyb->ops->set_input_ck(dlyb);
 584
 585         phase = end_of_len - max_len / 2;
 586         ret = dlyb->ops->set_cfg(dlyb, dlyb->unit, phase, false);
 587         if (ret) {
 588                 dev_err(mmc_dev(host->mmc), "tuning reconfig failed\n");
 589                 return ret;
 590         }
 591
 592         dev_dbg(mmc_dev(host->mmc), "unit:%d max_dly:%d phase:%d\n",
 593                 dlyb->unit, dlyb->max, phase);
 594
 595         return 0;
 596 }
 597
 598 static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
 599 {
 600         struct mmci_host *host = mmc_priv(mmc);
 601         struct sdmmc_dlyb *dlyb = host->variant_priv;
 602         u32 clk;
 603         int ret;
 604
 605         if ((host->mmc->ios.timing != MMC_TIMING_UHS_SDR104 &&
 606              host->mmc->ios.timing != MMC_TIMING_MMC_HS200) ||
 607             host->mmc->actual_clock <= 50000000)
 608                 return 0;
 609
 610         if (!dlyb || !dlyb->base)
 611                 return -EINVAL;
 612
 613         ret = dlyb->ops->dlyb_enable(dlyb);
 614         if (ret)
 615                 return ret;
 616
 617         /*
 618          * SDMMC_FBCK is selected when an external Delay Block is needed
 619          * with SDR104 or HS200.
 620          */
 621         clk = host->clk_reg;
 622         clk &= ~MCI_STM32_CLK_SEL_MSK;
 623         clk |= MCI_STM32_CLK_SELFBCK;
 624         mmci_write_clkreg(host, clk);
 625
 626         ret = dlyb->ops->tuning_prepare(host);
 627         if (ret)
 628                 return ret;
 629
 630         return sdmmc_dlyb_phase_tuning(host, opcode);
 631 }
 632
 633 static void sdmmc_pre_sig_volt_vswitch(struct mmci_host *host)
 634 {
 635         /* clear the voltage switch completion flag */
 636         writel_relaxed(MCI_STM32_VSWENDC, host->base + MMCICLEAR);
 637         /* enable Voltage switch procedure */
 638         mmci_write_pwrreg(host, host->pwr_reg | MCI_STM32_VSWITCHEN);
 639 }
 640
 641 static int sdmmc_post_sig_volt_switch(struct mmci_host *host,
 642                                       struct mmc_ios *ios)
 643 {
 644         unsigned long flags;
 645         u32 status;
 646         int ret = 0;
 647
 648         spin_lock_irqsave(&host->lock, flags);
 649         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180 &&
 650             host->pwr_reg & MCI_STM32_VSWITCHEN) {
 651                 mmci_write_pwrreg(host, host->pwr_reg | MCI_STM32_VSWITCH);
 652                 spin_unlock_irqrestore(&host->lock, flags);
 653
 654                 /* wait voltage switch completion while 10ms */
 655                 ret = readl_relaxed_poll_timeout(host->base + MMCISTATUS,
 656                                                  status,
 657                                                  (status & MCI_STM32_VSWEND),
 658                                                  10, SDMMC_VSWEND_TIMEOUT_US);
 659
 660                 writel_relaxed(MCI_STM32_VSWENDC | MCI_STM32_CKSTOPC,
 661                                host->base + MMCICLEAR);
 662                 spin_lock_irqsave(&host->lock, flags);
 663                 mmci_write_pwrreg(host, host->pwr_reg &
 664                                   ~(MCI_STM32_VSWITCHEN | MCI_STM32_VSWITCH));
 665         }
 666         spin_unlock_irqrestore(&host->lock, flags);
 667
 668         return ret;
 669 }
 670
 671 static struct mmci_host_ops sdmmc_variant_ops = {
 672         .validate_data = sdmmc_idma_validate_data,
 673         .prep_data = sdmmc_idma_prep_data,
 674         .unprep_data = sdmmc_idma_unprep_data,
 675         .get_datactrl_cfg = sdmmc_get_dctrl_cfg,
 676         .dma_setup = sdmmc_idma_setup,
 677         .dma_start = sdmmc_idma_start,
 678         .dma_finalize = sdmmc_idma_finalize,
 679         .set_clkreg = mmci_sdmmc_set_clkreg,
 680         .set_pwrreg = mmci_sdmmc_set_pwrreg,
 681         .busy_complete = sdmmc_busy_complete,
 682         .pre_sig_volt_switch = sdmmc_pre_sig_volt_vswitch,
 683         .post_sig_volt_switch = sdmmc_post_sig_volt_switch,
 684 };
 685
 686 static struct sdmmc_tuning_ops dlyb_tuning_mp15_ops = {
 687         .dlyb_enable = sdmmc_dlyb_mp15_enable,
 688         .set_input_ck = sdmmc_dlyb_mp15_input_ck,
 689         .tuning_prepare = sdmmc_dlyb_mp15_prepare,
 690         .set_cfg = sdmmc_dlyb_mp15_set_cfg,
 691 };
 692
 693 static struct sdmmc_tuning_ops dlyb_tuning_mp25_ops = {
 694         .dlyb_enable = sdmmc_dlyb_mp25_enable,
 695         .tuning_prepare = sdmmc_dlyb_mp25_prepare,
 696         .set_cfg = sdmmc_dlyb_mp25_set_cfg,
 697 };
 698
 699 void sdmmc_variant_init(struct mmci_host *host)
 700 {
 701         struct device_node *np = host->mmc->parent->of_node;
 702         void __iomem *base_dlyb;
 703         struct sdmmc_dlyb *dlyb;
 704
 705         host->ops = &sdmmc_variant_ops;
 706         host->pwr_reg = readl_relaxed(host->base + MMCIPOWER);
 707
 708         base_dlyb = devm_of_iomap(mmc_dev(host->mmc), np, 1, NULL);
 709         if (IS_ERR(base_dlyb))
 710                 return;
 711
 712         dlyb = devm_kzalloc(mmc_dev(host->mmc), sizeof(*dlyb), GFP_KERNEL);
 713         if (!dlyb)
 714                 return;
 715
 716         dlyb->base = base_dlyb;
 717         if (of_device_is_compatible(np, "st,stm32mp25-sdmmc2"))
 718                 dlyb->ops = &dlyb_tuning_mp25_ops;
 719         else
 720                 dlyb->ops = &dlyb_tuning_mp15_ops;
 721
 722         host->variant_priv = dlyb;
 723         host->mmc_ops->execute_tuning = sdmmc_execute_tuning;
 724 }