drivers/mmc/host/meson-mx-sdhc-mmc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Amlogic Meson6/Meson8/Meson8b/Meson8m2 SDHC MMC host controller driver.
   4  *
   5  * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/device.h>
  10 #include <linux/dma-mapping.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/iopoll.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/property.h>
  17 #include <linux/regmap.h>
  18 #include <linux/regulator/consumer.h>
  19 #include <linux/types.h>
  20
  21 #include <linux/mmc/host.h>
  22 #include <linux/mmc/mmc.h>
  23 #include <linux/mmc/sdio.h>
  24 #include <linux/mmc/slot-gpio.h>
  25
  26 #include "meson-mx-sdhc.h"
  27
  28 #define MESON_SDHC_NUM_BULK_CLKS                                4
  29 #define MESON_SDHC_MAX_BLK_SIZE                                 512
  30 #define MESON_SDHC_NUM_TUNING_TRIES                             10
  31
  32 #define MESON_SDHC_WAIT_CMD_READY_SLEEP_US                      1
  33 #define MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US                    100000
  34 #define MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US                    1
  35 #define MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US                  200
  36
  37 struct meson_mx_sdhc_data {
  38         void            (*init_hw)(struct mmc_host *mmc);
  39         void            (*set_pdma)(struct mmc_host *mmc);
  40         void            (*wait_before_send)(struct mmc_host *mmc);
  41         bool            hardware_flush_all_cmds;
  42 };
  43
  44 struct meson_mx_sdhc_host {
  45         struct mmc_host                 *mmc;
  46
  47         struct mmc_request              *mrq;
  48         struct mmc_command              *cmd;
  49         int                             error;
  50
  51         struct regmap                   *regmap;
  52
  53         struct clk                      *pclk;
  54         struct clk                      *sd_clk;
  55         struct clk_bulk_data            bulk_clks[MESON_SDHC_NUM_BULK_CLKS];
  56         bool                            bulk_clks_enabled;
  57
  58         const struct meson_mx_sdhc_data *platform;
  59 };
  60
  61 static const struct regmap_config meson_mx_sdhc_regmap_config = {
  62         .reg_bits = 8,
  63         .val_bits = 32,
  64         .reg_stride = 4,
  65         .max_register = MESON_SDHC_CLK2,
  66 };
  67
  68 static void meson_mx_sdhc_hw_reset(struct mmc_host *mmc)
  69 {
  70         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
  71
  72         regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_MAIN_CTRL |
  73                      MESON_SDHC_SRST_RXFIFO | MESON_SDHC_SRST_TXFIFO |
  74                      MESON_SDHC_SRST_DPHY_RX | MESON_SDHC_SRST_DPHY_TX |
  75                      MESON_SDHC_SRST_DMA_IF);
  76         usleep_range(10, 100);
  77
  78         regmap_write(host->regmap, MESON_SDHC_SRST, 0);
  79         usleep_range(10, 100);
  80 }
  81
  82 static void meson_mx_sdhc_clear_fifo(struct mmc_host *mmc)
  83 {
  84         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
  85         u32 stat;
  86
  87         regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
  88         if (!FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) &&
  89             !FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat))
  90                 return;
  91
  92         regmap_write(host->regmap, MESON_SDHC_SRST, MESON_SDHC_SRST_RXFIFO |
  93                      MESON_SDHC_SRST_TXFIFO | MESON_SDHC_SRST_MAIN_CTRL);
  94         udelay(5);
  95
  96         regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
  97         if (FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat) ||
  98             FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat))
  99                 dev_warn(mmc_dev(host->mmc),
 100                          "Failed to clear FIFOs, RX: %lu, TX: %lu\n",
 101                          FIELD_GET(MESON_SDHC_STAT_RXFIFO_CNT, stat),
 102                          FIELD_GET(MESON_SDHC_STAT_TXFIFO_CNT, stat));
 103 }
 104
 105 static void meson_mx_sdhc_wait_cmd_ready(struct mmc_host *mmc)
 106 {
 107         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 108         u32 stat, esta;
 109         int ret;
 110
 111         ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT, stat,
 112                                        !(stat & MESON_SDHC_STAT_CMD_BUSY),
 113                                        MESON_SDHC_WAIT_CMD_READY_SLEEP_US,
 114                                        MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US);
 115         if (ret) {
 116                 dev_warn(mmc_dev(mmc),
 117                          "Failed to poll for CMD_BUSY while processing CMD%d\n",
 118                          host->cmd->opcode);
 119                 meson_mx_sdhc_hw_reset(mmc);
 120         }
 121
 122         ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, esta,
 123                                        !(esta & MESON_SDHC_ESTA_11_13),
 124                                        MESON_SDHC_WAIT_CMD_READY_SLEEP_US,
 125                                        MESON_SDHC_WAIT_CMD_READY_TIMEOUT_US);
 126         if (ret) {
 127                 dev_warn(mmc_dev(mmc),
 128                          "Failed to poll for ESTA[13:11] while processing CMD%d\n",
 129                          host->cmd->opcode);
 130                 meson_mx_sdhc_hw_reset(mmc);
 131         }
 132 }
 133
 134 static void meson_mx_sdhc_start_cmd(struct mmc_host *mmc,
 135                                     struct mmc_command *cmd)
 136 {
 137         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 138         u32 ictl, send;
 139         int pack_len;
 140
 141         host->cmd = cmd;
 142
 143         ictl = MESON_SDHC_ICTL_DATA_TIMEOUT | MESON_SDHC_ICTL_DATA_ERR_CRC |
 144                MESON_SDHC_ICTL_RXFIFO_FULL | MESON_SDHC_ICTL_TXFIFO_EMPTY |
 145                MESON_SDHC_ICTL_RESP_TIMEOUT | MESON_SDHC_ICTL_RESP_ERR_CRC;
 146
 147         send = FIELD_PREP(MESON_SDHC_SEND_CMD_INDEX, cmd->opcode);
 148
 149         if (cmd->data) {
 150                 send |= MESON_SDHC_SEND_CMD_HAS_DATA;
 151                 send |= FIELD_PREP(MESON_SDHC_SEND_TOTAL_PACK,
 152                                    cmd->data->blocks - 1);
 153
 154                 if (cmd->data->blksz < MESON_SDHC_MAX_BLK_SIZE)
 155                         pack_len = cmd->data->blksz;
 156                 else
 157                         pack_len = 0;
 158
 159                 if (cmd->data->flags & MMC_DATA_WRITE)
 160                         send |= MESON_SDHC_SEND_DATA_DIR;
 161
 162                 /*
 163                  * If command with no data, just wait response done
 164                  * interrupt(int[0]), and if command with data transfer, just
 165                  * wait dma done interrupt(int[11]), don't need care about
 166                  * dat0 busy or not.
 167                  */
 168                 if (host->platform->hardware_flush_all_cmds ||
 169                     cmd->data->flags & MMC_DATA_WRITE)
 170                         /* hardware flush: */
 171                         ictl |= MESON_SDHC_ICTL_DMA_DONE;
 172                 else
 173                         /* software flush: */
 174                         ictl |= MESON_SDHC_ICTL_DATA_XFER_OK;
 175         } else {
 176                 pack_len = 0;
 177
 178                 ictl |= MESON_SDHC_ICTL_RESP_OK;
 179         }
 180
 181         if (cmd->opcode == MMC_STOP_TRANSMISSION)
 182                 send |= MESON_SDHC_SEND_DATA_STOP;
 183
 184         if (cmd->flags & MMC_RSP_PRESENT)
 185                 send |= MESON_SDHC_SEND_CMD_HAS_RESP;
 186
 187         if (cmd->flags & MMC_RSP_136) {
 188                 send |= MESON_SDHC_SEND_RESP_LEN;
 189                 send |= MESON_SDHC_SEND_RESP_NO_CRC;
 190         }
 191
 192         if (!(cmd->flags & MMC_RSP_CRC))
 193                 send |= MESON_SDHC_SEND_RESP_NO_CRC;
 194
 195         if (cmd->flags & MMC_RSP_BUSY)
 196                 send |= MESON_SDHC_SEND_R1B;
 197
 198         /* enable the new IRQs and mask all pending ones */
 199         regmap_write(host->regmap, MESON_SDHC_ICTL, ictl);
 200         regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
 201
 202         regmap_write(host->regmap, MESON_SDHC_ARGU, cmd->arg);
 203
 204         regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
 205                            MESON_SDHC_CTRL_PACK_LEN,
 206                            FIELD_PREP(MESON_SDHC_CTRL_PACK_LEN, pack_len));
 207
 208         if (cmd->data)
 209                 regmap_write(host->regmap, MESON_SDHC_ADDR,
 210                              sg_dma_address(cmd->data->sg));
 211
 212         meson_mx_sdhc_wait_cmd_ready(mmc);
 213
 214         if (cmd->data)
 215                 host->platform->set_pdma(mmc);
 216
 217         if (host->platform->wait_before_send)
 218                 host->platform->wait_before_send(mmc);
 219
 220         regmap_write(host->regmap, MESON_SDHC_SEND, send);
 221 }
 222
 223 static void meson_mx_sdhc_disable_clks(struct mmc_host *mmc)
 224 {
 225         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 226
 227         if (!host->bulk_clks_enabled)
 228                 return;
 229
 230         clk_bulk_disable_unprepare(MESON_SDHC_NUM_BULK_CLKS, host->bulk_clks);
 231
 232         host->bulk_clks_enabled = false;
 233 }
 234
 235 static int meson_mx_sdhc_enable_clks(struct mmc_host *mmc)
 236 {
 237         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 238         int ret;
 239
 240         if (host->bulk_clks_enabled)
 241                 return 0;
 242
 243         ret = clk_bulk_prepare_enable(MESON_SDHC_NUM_BULK_CLKS,
 244                                       host->bulk_clks);
 245         if (ret)
 246                 return ret;
 247
 248         host->bulk_clks_enabled = true;
 249
 250         return 0;
 251 }
 252
 253 static int meson_mx_sdhc_set_clk(struct mmc_host *mmc, struct mmc_ios *ios)
 254 {
 255         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 256         u32 rx_clk_phase;
 257         int ret;
 258
 259         meson_mx_sdhc_disable_clks(mmc);
 260
 261         if (ios->clock) {
 262                 ret = clk_set_rate(host->sd_clk, ios->clock);
 263                 if (ret) {
 264                         dev_warn(mmc_dev(mmc),
 265                                  "Failed to set MMC clock to %uHz: %d\n",
 266                                  ios->clock, host->error);
 267                         return ret;
 268                 }
 269
 270                 ret = meson_mx_sdhc_enable_clks(mmc);
 271                 if (ret)
 272                         return ret;
 273
 274                 mmc->actual_clock = clk_get_rate(host->sd_clk);
 275
 276                 /*
 277                  * according to Amlogic the following latching points are
 278                  * selected with empirical values, there is no (known) formula
 279                  * to calculate these.
 280                  */
 281                 if (mmc->actual_clock > 100000000) {
 282                         rx_clk_phase = 1;
 283                 } else if (mmc->actual_clock > 45000000) {
 284                         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
 285                                 rx_clk_phase = 15;
 286                         else
 287                                 rx_clk_phase = 11;
 288                 } else if (mmc->actual_clock >= 25000000) {
 289                         rx_clk_phase = 15;
 290                 } else if (mmc->actual_clock > 5000000) {
 291                         rx_clk_phase = 23;
 292                 } else if (mmc->actual_clock > 1000000) {
 293                         rx_clk_phase = 55;
 294                 } else {
 295                         rx_clk_phase = 1061;
 296                 }
 297
 298                 regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
 299                                    MESON_SDHC_CLK2_RX_CLK_PHASE,
 300                                    FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
 301                                               rx_clk_phase));
 302         } else {
 303                 mmc->actual_clock = 0;
 304         }
 305
 306         return 0;
 307 }
 308
 309 static void meson_mx_sdhc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 310 {
 311         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 312         unsigned short vdd = ios->vdd;
 313
 314         switch (ios->power_mode) {
 315         case MMC_POWER_OFF:
 316                 vdd = 0;
 317                 fallthrough;
 318
 319         case MMC_POWER_UP:
 320                 if (!IS_ERR(mmc->supply.vmmc)) {
 321                         host->error = mmc_regulator_set_ocr(mmc,
 322                                                             mmc->supply.vmmc,
 323                                                             vdd);
 324                         if (host->error)
 325                                 return;
 326                 }
 327
 328                 break;
 329
 330         case MMC_POWER_ON:
 331                 break;
 332         }
 333
 334         host->error = meson_mx_sdhc_set_clk(mmc, ios);
 335         if (host->error)
 336                 return;
 337
 338         switch (ios->bus_width) {
 339         case MMC_BUS_WIDTH_1:
 340                 regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
 341                                    MESON_SDHC_CTRL_DAT_TYPE,
 342                                    FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 0));
 343                 break;
 344
 345         case MMC_BUS_WIDTH_4:
 346                 regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
 347                                    MESON_SDHC_CTRL_DAT_TYPE,
 348                                    FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 1));
 349                 break;
 350
 351         case MMC_BUS_WIDTH_8:
 352                 regmap_update_bits(host->regmap, MESON_SDHC_CTRL,
 353                                    MESON_SDHC_CTRL_DAT_TYPE,
 354                                    FIELD_PREP(MESON_SDHC_CTRL_DAT_TYPE, 2));
 355                 break;
 356
 357         default:
 358                 dev_err(mmc_dev(mmc), "unsupported bus width: %d\n",
 359                         ios->bus_width);
 360                 host->error = -EINVAL;
 361                 return;
 362         }
 363 }
 364
 365 static int meson_mx_sdhc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq)
 366 {
 367         struct mmc_data *data = mrq->data;
 368         int dma_len;
 369
 370         if (!data)
 371                 return 0;
 372
 373         dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len,
 374                              mmc_get_dma_dir(data));
 375         if (dma_len <= 0) {
 376                 dev_err(mmc_dev(mmc), "dma_map_sg failed\n");
 377                 return -ENOMEM;
 378         }
 379
 380         return 0;
 381 }
 382
 383 static void meson_mx_sdhc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 384 {
 385         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 386         struct mmc_command *cmd = mrq->cmd;
 387
 388         if (!host->error)
 389                 host->error = meson_mx_sdhc_map_dma(mmc, mrq);
 390
 391         if (host->error) {
 392                 cmd->error = host->error;
 393                 mmc_request_done(mmc, mrq);
 394                 return;
 395         }
 396
 397         host->mrq = mrq;
 398
 399         meson_mx_sdhc_start_cmd(mmc, mrq->cmd);
 400 }
 401
 402 static int meson_mx_sdhc_card_busy(struct mmc_host *mmc)
 403 {
 404         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 405         u32 stat;
 406
 407         regmap_read(host->regmap, MESON_SDHC_STAT, &stat);
 408         return FIELD_GET(MESON_SDHC_STAT_DAT3_0, stat) == 0;
 409 }
 410
 411 static bool meson_mx_sdhc_tuning_point_matches(struct mmc_host *mmc,
 412                                                u32 opcode)
 413 {
 414         unsigned int i, num_matches = 0;
 415         int ret;
 416
 417         for (i = 0; i < MESON_SDHC_NUM_TUNING_TRIES; i++) {
 418                 ret = mmc_send_tuning(mmc, opcode, NULL);
 419                 if (!ret)
 420                         num_matches++;
 421         }
 422
 423         return num_matches == MESON_SDHC_NUM_TUNING_TRIES;
 424 }
 425
 426 static int meson_mx_sdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
 427 {
 428         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 429         int div, start, len, best_start, best_len;
 430         int curr_phase, old_phase, new_phase;
 431         u32 val;
 432
 433         len = 0;
 434         start = 0;
 435         best_len = 0;
 436
 437         regmap_read(host->regmap, MESON_SDHC_CLK2, &val);
 438         old_phase = FIELD_GET(MESON_SDHC_CLK2_RX_CLK_PHASE, val);
 439
 440         regmap_read(host->regmap, MESON_SDHC_CLKC, &val);
 441         div = FIELD_GET(MESON_SDHC_CLKC_CLK_DIV, val);
 442
 443         for (curr_phase = 0; curr_phase <= div; curr_phase++) {
 444                 regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
 445                                    MESON_SDHC_CLK2_RX_CLK_PHASE,
 446                                    FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
 447                                               curr_phase));
 448
 449                 if (meson_mx_sdhc_tuning_point_matches(mmc, opcode)) {
 450                         if (!len) {
 451                                 start = curr_phase;
 452
 453                                 dev_dbg(mmc_dev(mmc),
 454                                         "New RX phase window starts at %u\n",
 455                                         start);
 456                         }
 457
 458                         len++;
 459                 } else {
 460                         if (len > best_len) {
 461                                 best_start = start;
 462                                 best_len = len;
 463
 464                                 dev_dbg(mmc_dev(mmc),
 465                                         "New best RX phase window: %u - %u\n",
 466                                         best_start, best_start + best_len);
 467                         }
 468
 469                         /* reset the current window */
 470                         len = 0;
 471                 }
 472         }
 473
 474         if (len > best_len)
 475                 /* the last window is the best (or possibly only) window */
 476                 new_phase = start + (len / 2);
 477         else if (best_len)
 478                 /* there was a better window than the last */
 479                 new_phase = best_start + (best_len / 2);
 480         else
 481                 /* no window was found at all, reset to the original phase */
 482                 new_phase = old_phase;
 483
 484         regmap_update_bits(host->regmap, MESON_SDHC_CLK2,
 485                            MESON_SDHC_CLK2_RX_CLK_PHASE,
 486                            FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,
 487                                       new_phase));
 488
 489         if (!len && !best_len)
 490                 return -EIO;
 491
 492         dev_dbg(mmc_dev(mmc), "Tuned RX clock phase to %u\n", new_phase);
 493
 494         return 0;
 495 }
 496
 497 static const struct mmc_host_ops meson_mx_sdhc_ops = {
 498         .hw_reset                       = meson_mx_sdhc_hw_reset,
 499         .request                        = meson_mx_sdhc_request,
 500         .set_ios                        = meson_mx_sdhc_set_ios,
 501         .card_busy                      = meson_mx_sdhc_card_busy,
 502         .execute_tuning                 = meson_mx_sdhc_execute_tuning,
 503         .get_cd                         = mmc_gpio_get_cd,
 504         .get_ro                         = mmc_gpio_get_ro,
 505 };
 506
 507 static void meson_mx_sdhc_request_done(struct meson_mx_sdhc_host *host)
 508 {
 509         struct mmc_request *mrq = host->mrq;
 510         struct mmc_host *mmc = host->mmc;
 511
 512         /* disable interrupts and mask all pending ones */
 513         regmap_update_bits(host->regmap, MESON_SDHC_ICTL,
 514                            MESON_SDHC_ICTL_ALL_IRQS, 0);
 515         regmap_update_bits(host->regmap, MESON_SDHC_ISTA,
 516                            MESON_SDHC_ISTA_ALL_IRQS, MESON_SDHC_ISTA_ALL_IRQS);
 517
 518         host->mrq = NULL;
 519         host->cmd = NULL;
 520
 521         mmc_request_done(mmc, mrq);
 522 }
 523
 524 static u32 meson_mx_sdhc_read_response(struct meson_mx_sdhc_host *host, u8 idx)
 525 {
 526         u32 val;
 527
 528         regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
 529                            MESON_SDHC_PDMA_DMA_MODE, 0);
 530
 531         regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
 532                            MESON_SDHC_PDMA_PIO_RDRESP,
 533                            FIELD_PREP(MESON_SDHC_PDMA_PIO_RDRESP, idx));
 534
 535         regmap_read(host->regmap, MESON_SDHC_ARGU, &val);
 536
 537         return val;
 538 }
 539
 540 static irqreturn_t meson_mx_sdhc_irq(int irq, void *data)
 541 {
 542         struct meson_mx_sdhc_host *host = data;
 543         struct mmc_command *cmd = host->cmd;
 544         u32 ictl, ista;
 545
 546         regmap_read(host->regmap, MESON_SDHC_ICTL, &ictl);
 547         regmap_read(host->regmap, MESON_SDHC_ISTA, &ista);
 548
 549         if (!(ictl & ista))
 550                 return IRQ_NONE;
 551
 552         if (ista & MESON_SDHC_ISTA_RXFIFO_FULL ||
 553             ista & MESON_SDHC_ISTA_TXFIFO_EMPTY)
 554                 cmd->error = -EIO;
 555         else if (ista & MESON_SDHC_ISTA_RESP_ERR_CRC)
 556                 cmd->error = -EILSEQ;
 557         else if (ista & MESON_SDHC_ISTA_RESP_TIMEOUT)
 558                 cmd->error = -ETIMEDOUT;
 559
 560         if (cmd->data) {
 561                 if (ista & MESON_SDHC_ISTA_DATA_ERR_CRC)
 562                         cmd->data->error = -EILSEQ;
 563                 else if (ista & MESON_SDHC_ISTA_DATA_TIMEOUT)
 564                         cmd->data->error = -ETIMEDOUT;
 565         }
 566
 567         if (cmd->error || (cmd->data && cmd->data->error))
 568                 dev_dbg(mmc_dev(host->mmc), "CMD%d error, ISTA: 0x%08x\n",
 569                         cmd->opcode, ista);
 570
 571         return IRQ_WAKE_THREAD;
 572 }
 573
 574 static irqreturn_t meson_mx_sdhc_irq_thread(int irq, void *irq_data)
 575 {
 576         struct meson_mx_sdhc_host *host = irq_data;
 577         struct mmc_command *cmd;
 578         u32 val;
 579
 580         cmd = host->cmd;
 581         if (WARN_ON(!cmd))
 582                 return IRQ_HANDLED;
 583
 584         if (cmd->data && !cmd->data->error) {
 585                 if (!host->platform->hardware_flush_all_cmds &&
 586                     cmd->data->flags & MMC_DATA_READ) {
 587                         meson_mx_sdhc_wait_cmd_ready(host->mmc);
 588
 589                         /*
 590                          * If MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH was
 591                          * previously 0x1 then it has to be set to 0x3. If it
 592                          * was 0x0 before then it has to be set to 0x2. Without
 593                          * this reading SD cards sometimes transfers garbage,
 594                          * which results in cards not being detected due to:
 595                          *   unrecognised SCR structure version <random number>
 596                          */
 597                         val = FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
 598                                          2);
 599                         regmap_update_bits(host->regmap, MESON_SDHC_PDMA, val,
 600                                            val);
 601                 }
 602
 603                 dma_unmap_sg(mmc_dev(host->mmc), cmd->data->sg,
 604                              cmd->data->sg_len, mmc_get_dma_dir(cmd->data));
 605
 606                 cmd->data->bytes_xfered = cmd->data->blksz * cmd->data->blocks;
 607         }
 608
 609         meson_mx_sdhc_wait_cmd_ready(host->mmc);
 610
 611         if (cmd->flags & MMC_RSP_136) {
 612                 cmd->resp[0] = meson_mx_sdhc_read_response(host, 4);
 613                 cmd->resp[1] = meson_mx_sdhc_read_response(host, 3);
 614                 cmd->resp[2] = meson_mx_sdhc_read_response(host, 2);
 615                 cmd->resp[3] = meson_mx_sdhc_read_response(host, 1);
 616         } else {
 617                 cmd->resp[0] = meson_mx_sdhc_read_response(host, 0);
 618         }
 619
 620         if (cmd->error == -EIO || cmd->error == -ETIMEDOUT)
 621                 meson_mx_sdhc_hw_reset(host->mmc);
 622         else if (cmd->data)
 623                 /*
 624                  * Clear the FIFOs after completing data transfers to prevent
 625                  * corrupting data on write access. It's not clear why this is
 626                  * needed (for reads and writes), but it mimics what the BSP
 627                  * kernel did.
 628                  */
 629                 meson_mx_sdhc_clear_fifo(host->mmc);
 630
 631         meson_mx_sdhc_request_done(host);
 632
 633         return IRQ_HANDLED;
 634 }
 635
 636 static void meson_mx_sdhc_init_hw_meson8(struct mmc_host *mmc)
 637 {
 638         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 639
 640         regmap_write(host->regmap, MESON_SDHC_MISC,
 641                      FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 7) |
 642                      FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) |
 643                      FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2));
 644
 645         regmap_write(host->regmap, MESON_SDHC_ENHC,
 646                      FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 63) |
 647                      MESON_SDHC_ENHC_MESON6_DMA_WR_RESP |
 648                      FIELD_PREP(MESON_SDHC_ENHC_MESON6_RX_TIMEOUT, 255) |
 649                      FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12));
 650 };
 651
 652 static void meson_mx_sdhc_set_pdma_meson8(struct mmc_host *mmc)
 653 {
 654         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 655
 656         if (host->cmd->data->flags & MMC_DATA_WRITE)
 657                 regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
 658                                    MESON_SDHC_PDMA_DMA_MODE |
 659                                    MESON_SDHC_PDMA_RD_BURST |
 660                                    MESON_SDHC_PDMA_TXFIFO_FILL,
 661                                    MESON_SDHC_PDMA_DMA_MODE |
 662                                    FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 31) |
 663                                    MESON_SDHC_PDMA_TXFIFO_FILL);
 664         else
 665                 regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
 666                                    MESON_SDHC_PDMA_DMA_MODE |
 667                                    MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
 668                                    MESON_SDHC_PDMA_DMA_MODE |
 669                                    FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH,
 670                                               1));
 671
 672         if (host->cmd->data->flags & MMC_DATA_WRITE)
 673                 regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
 674                                    MESON_SDHC_PDMA_RD_BURST,
 675                                    FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15));
 676 }
 677
 678 static void meson_mx_sdhc_wait_before_send_meson8(struct mmc_host *mmc)
 679 {
 680         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 681         u32 val;
 682         int ret;
 683
 684         ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_ESTA, val,
 685                                        val == 0,
 686                                        MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US,
 687                                        MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US);
 688         if (ret)
 689                 dev_warn(mmc_dev(mmc),
 690                          "Failed to wait for ESTA to clear: 0x%08x\n", val);
 691
 692         if (host->cmd->data && host->cmd->data->flags & MMC_DATA_WRITE) {
 693                 ret = regmap_read_poll_timeout(host->regmap, MESON_SDHC_STAT,
 694                                         val, val & MESON_SDHC_STAT_TXFIFO_CNT,
 695                                         MESON_SDHC_WAIT_BEFORE_SEND_SLEEP_US,
 696                                         MESON_SDHC_WAIT_BEFORE_SEND_TIMEOUT_US);
 697                 if (ret)
 698                         dev_warn(mmc_dev(mmc),
 699                                  "Failed to wait for TX FIFO to fill\n");
 700         }
 701 }
 702
 703 static void meson_mx_sdhc_init_hw_meson8m2(struct mmc_host *mmc)
 704 {
 705         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 706
 707         regmap_write(host->regmap, MESON_SDHC_MISC,
 708                      FIELD_PREP(MESON_SDHC_MISC_TXSTART_THRES, 6) |
 709                      FIELD_PREP(MESON_SDHC_MISC_WCRC_ERR_PATT, 5) |
 710                      FIELD_PREP(MESON_SDHC_MISC_WCRC_OK_PATT, 2));
 711
 712         regmap_write(host->regmap, MESON_SDHC_ENHC,
 713                      FIELD_PREP(MESON_SDHC_ENHC_RXFIFO_TH, 64) |
 714                      FIELD_PREP(MESON_SDHC_ENHC_MESON8M2_DEBUG, 1) |
 715                      MESON_SDHC_ENHC_MESON8M2_WRRSP_MODE |
 716                      FIELD_PREP(MESON_SDHC_ENHC_SDIO_IRQ_PERIOD, 12));
 717 }
 718
 719 static void meson_mx_sdhc_set_pdma_meson8m2(struct mmc_host *mmc)
 720 {
 721         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 722
 723         regmap_update_bits(host->regmap, MESON_SDHC_PDMA,
 724                            MESON_SDHC_PDMA_DMA_MODE, MESON_SDHC_PDMA_DMA_MODE);
 725 }
 726
 727 static void meson_mx_sdhc_init_hw(struct mmc_host *mmc)
 728 {
 729         struct meson_mx_sdhc_host *host = mmc_priv(mmc);
 730
 731         meson_mx_sdhc_hw_reset(mmc);
 732
 733         regmap_write(host->regmap, MESON_SDHC_CTRL,
 734                      FIELD_PREP(MESON_SDHC_CTRL_RX_PERIOD, 0xf) |
 735                      FIELD_PREP(MESON_SDHC_CTRL_RX_TIMEOUT, 0x7f) |
 736                      FIELD_PREP(MESON_SDHC_CTRL_RX_ENDIAN, 0x7) |
 737                      FIELD_PREP(MESON_SDHC_CTRL_TX_ENDIAN, 0x7));
 738
 739         /*
 740          * start with a valid divider and enable the memory (un-setting
 741          * MESON_SDHC_CLKC_MEM_PWR_OFF).
 742          */
 743         regmap_write(host->regmap, MESON_SDHC_CLKC, MESON_SDHC_CLKC_CLK_DIV);
 744
 745         regmap_write(host->regmap, MESON_SDHC_CLK2,
 746                      FIELD_PREP(MESON_SDHC_CLK2_SD_CLK_PHASE, 1));
 747
 748         regmap_write(host->regmap, MESON_SDHC_PDMA,
 749                      MESON_SDHC_PDMA_DMA_URGENT |
 750                      FIELD_PREP(MESON_SDHC_PDMA_WR_BURST, 7) |
 751                      FIELD_PREP(MESON_SDHC_PDMA_TXFIFO_TH, 49) |
 752                      FIELD_PREP(MESON_SDHC_PDMA_RD_BURST, 15) |
 753                      FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_TH, 7));
 754
 755         /* some initialization bits depend on the SoC: */
 756         host->platform->init_hw(mmc);
 757
 758         /* disable and mask all interrupts: */
 759         regmap_write(host->regmap, MESON_SDHC_ICTL, 0);
 760         regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
 761 }
 762
 763 static int meson_mx_sdhc_probe(struct platform_device *pdev)
 764 {
 765         struct device *dev = &pdev->dev;
 766         struct meson_mx_sdhc_host *host;
 767         struct mmc_host *mmc;
 768         void __iomem *base;
 769         int ret, irq;
 770
 771         mmc = mmc_alloc_host(sizeof(*host), dev);
 772         if (!mmc)
 773                 return -ENOMEM;
 774
 775         ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host,
 776                                        mmc);
 777         if (ret) {
 778                 dev_err(dev, "Failed to register mmc_free_host action\n");
 779                 return ret;
 780         }
 781
 782         host = mmc_priv(mmc);
 783         host->mmc = mmc;
 784
 785         platform_set_drvdata(pdev, host);
 786
 787         host->platform = device_get_match_data(dev);
 788         if (!host->platform)
 789                 return -EINVAL;
 790
 791         base = devm_platform_ioremap_resource(pdev, 0);
 792         if (IS_ERR(base))
 793                 return PTR_ERR(base);
 794
 795         host->regmap = devm_regmap_init_mmio(dev, base,
 796                                              &meson_mx_sdhc_regmap_config);
 797         if (IS_ERR(host->regmap))
 798                 return PTR_ERR(host->regmap);
 799
 800         host->pclk = devm_clk_get(dev, "pclk");
 801         if (IS_ERR(host->pclk))
 802                 return PTR_ERR(host->pclk);
 803
 804         /* accessing any register requires the module clock to be enabled: */
 805         ret = clk_prepare_enable(host->pclk);
 806         if (ret) {
 807                 dev_err(dev, "Failed to enable 'pclk' clock\n");
 808                 return ret;
 809         }
 810
 811         meson_mx_sdhc_init_hw(mmc);
 812
 813         ret = meson_mx_sdhc_register_clkc(dev, base, host->bulk_clks);
 814         if (ret)
 815                 goto err_disable_pclk;
 816
 817         host->sd_clk = host->bulk_clks[1].clk;
 818
 819         /* Get regulators and the supported OCR mask */
 820         ret = mmc_regulator_get_supply(mmc);
 821         if (ret)
 822                 goto err_disable_pclk;
 823
 824         mmc->max_req_size = SZ_128K;
 825         mmc->max_seg_size = mmc->max_req_size;
 826         mmc->max_blk_count = FIELD_GET(MESON_SDHC_SEND_TOTAL_PACK, ~0);
 827         mmc->max_blk_size = MESON_SDHC_MAX_BLK_SIZE;
 828         mmc->max_busy_timeout = 30 * MSEC_PER_SEC;
 829         mmc->f_min = clk_round_rate(host->sd_clk, 1);
 830         mmc->f_max = clk_round_rate(host->sd_clk, ULONG_MAX);
 831         mmc->max_current_180 = 300;
 832         mmc->max_current_330 = 300;
 833         mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_HW_RESET;
 834         mmc->ops = &meson_mx_sdhc_ops;
 835
 836         ret = mmc_of_parse(mmc);
 837         if (ret)
 838                 goto err_disable_pclk;
 839
 840         irq = platform_get_irq(pdev, 0);
 841         ret = devm_request_threaded_irq(dev, irq, meson_mx_sdhc_irq,
 842                                         meson_mx_sdhc_irq_thread, IRQF_ONESHOT,
 843                                         NULL, host);
 844         if (ret)
 845                 goto err_disable_pclk;
 846
 847         ret = mmc_add_host(mmc);
 848         if (ret)
 849                 goto err_disable_pclk;
 850
 851         return 0;
 852
 853 err_disable_pclk:
 854         clk_disable_unprepare(host->pclk);
 855         return ret;
 856 }
 857
 858 static int meson_mx_sdhc_remove(struct platform_device *pdev)
 859 {
 860         struct meson_mx_sdhc_host *host = platform_get_drvdata(pdev);
 861
 862         mmc_remove_host(host->mmc);
 863
 864         meson_mx_sdhc_disable_clks(host->mmc);
 865
 866         clk_disable_unprepare(host->pclk);
 867
 868         return 0;
 869 }
 870
 871 static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8 = {
 872         .init_hw                        = meson_mx_sdhc_init_hw_meson8,
 873         .set_pdma                       = meson_mx_sdhc_set_pdma_meson8,
 874         .wait_before_send               = meson_mx_sdhc_wait_before_send_meson8,
 875         .hardware_flush_all_cmds        = false,
 876 };
 877
 878 static const struct meson_mx_sdhc_data meson_mx_sdhc_data_meson8m2 = {
 879         .init_hw                        = meson_mx_sdhc_init_hw_meson8m2,
 880         .set_pdma                       = meson_mx_sdhc_set_pdma_meson8m2,
 881         .hardware_flush_all_cmds        = true,
 882 };
 883
 884 static const struct of_device_id meson_mx_sdhc_of_match[] = {
 885         {
 886                 .compatible = "amlogic,meson8-sdhc",
 887                 .data = &meson_mx_sdhc_data_meson8
 888         },
 889         {
 890                 .compatible = "amlogic,meson8b-sdhc",
 891                 .data = &meson_mx_sdhc_data_meson8
 892         },
 893         {
 894                 .compatible = "amlogic,meson8m2-sdhc",
 895                 .data = &meson_mx_sdhc_data_meson8m2
 896         },
 897         { /* sentinel */ }
 898 };
 899 MODULE_DEVICE_TABLE(of, meson_mx_sdhc_of_match);
 900
 901 static struct platform_driver meson_mx_sdhc_driver = {
 902         .probe   = meson_mx_sdhc_probe,
 903         .remove  = meson_mx_sdhc_remove,
 904         .driver  = {
 905                 .name = "meson-mx-sdhc",
 906                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 907                 .of_match_table = of_match_ptr(meson_mx_sdhc_of_match),
 908         },
 909 };
 910
 911 module_platform_driver(meson_mx_sdhc_driver);
 912
 913 MODULE_DESCRIPTION("Meson6, Meson8, Meson8b and Meson8m2 SDHC Host Driver");
 914 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
 915 MODULE_LICENSE("GPL v2");