drivers/mmc/host/rtsx_usb_sdmmc.c

   1 /* Realtek USB SD/MMC Card Interface driver
   2  *
   3  * Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, see <http://www.gnu.org/licenses/>.
  16  *
  17  * Author:
  18  *   Roger Tseng <rogerable@realtek.com>
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/slab.h>
  23 #include <linux/delay.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/usb.h>
  26 #include <linux/mmc/host.h>
  27 #include <linux/mmc/mmc.h>
  28 #include <linux/mmc/sd.h>
  29 #include <linux/mmc/card.h>
  30 #include <linux/scatterlist.h>
  31 #include <linux/pm_runtime.h>
  32
  33 #include <linux/rtsx_usb.h>
  34 #include <asm/unaligned.h>
  35
  36 #if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
  37                 defined(CONFIG_MMC_REALTEK_USB_MODULE))
  38 #include <linux/leds.h>
  39 #include <linux/workqueue.h>
  40 #define RTSX_USB_USE_LEDS_CLASS
  41 #endif
  42
  43 struct rtsx_usb_sdmmc {
  44         struct platform_device  *pdev;
  45         struct rtsx_ucr *ucr;
  46         struct mmc_host         *mmc;
  47         struct mmc_request      *mrq;
  48
  49         struct mutex            host_mutex;
  50
  51         u8                      ssc_depth;
  52         unsigned int            clock;
  53         bool                    vpclk;
  54         bool                    double_clk;
  55         bool                    host_removal;
  56         bool                    card_exist;
  57         bool                    initial_mode;
  58         bool                    ddr_mode;
  59
  60         unsigned char           power_mode;
  61
  62 #ifdef RTSX_USB_USE_LEDS_CLASS
  63         struct led_classdev     led;
  64         char                    led_name[32];
  65         struct work_struct      led_work;
  66 #endif
  67 };
  68
  69 static inline struct device *sdmmc_dev(struct rtsx_usb_sdmmc *host)
  70 {
  71         return &(host->pdev->dev);
  72 }
  73
  74 static inline void sd_clear_error(struct rtsx_usb_sdmmc *host)
  75 {
  76         struct rtsx_ucr *ucr = host->ucr;
  77         rtsx_usb_ep0_write_register(ucr, CARD_STOP,
  78                                   SD_STOP | SD_CLR_ERR,
  79                                   SD_STOP | SD_CLR_ERR);
  80
  81         rtsx_usb_clear_dma_err(ucr);
  82         rtsx_usb_clear_fsm_err(ucr);
  83 }
  84
  85 #ifdef DEBUG
  86 static void sd_print_debug_regs(struct rtsx_usb_sdmmc *host)
  87 {
  88         struct rtsx_ucr *ucr = host->ucr;
  89         u8 val = 0;
  90
  91         rtsx_usb_ep0_read_register(ucr, SD_STAT1, &val);
  92         dev_dbg(sdmmc_dev(host), "SD_STAT1: 0x%x\n", val);
  93         rtsx_usb_ep0_read_register(ucr, SD_STAT2, &val);
  94         dev_dbg(sdmmc_dev(host), "SD_STAT2: 0x%x\n", val);
  95         rtsx_usb_ep0_read_register(ucr, SD_BUS_STAT, &val);
  96         dev_dbg(sdmmc_dev(host), "SD_BUS_STAT: 0x%x\n", val);
  97 }
  98 #else
  99 #define sd_print_debug_regs(host)
 100 #endif /* DEBUG */
 101
 102 static int sd_read_data(struct rtsx_usb_sdmmc *host, struct mmc_command *cmd,
 103                u16 byte_cnt, u8 *buf, int buf_len, int timeout)
 104 {
 105         struct rtsx_ucr *ucr = host->ucr;
 106         int err;
 107         u8 trans_mode;
 108
 109         if (!buf)
 110                 buf_len = 0;
 111
 112         rtsx_usb_init_cmd(ucr);
 113         if (cmd != NULL) {
 114                 dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD%d\n", __func__
 115                                 , cmd->opcode);
 116                 if (cmd->opcode == MMC_SEND_TUNING_BLOCK)
 117                         trans_mode = SD_TM_AUTO_TUNING;
 118                 else
 119                         trans_mode = SD_TM_NORMAL_READ;
 120
 121                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 122                                 SD_CMD0, 0xFF, (u8)(cmd->opcode) | 0x40);
 123                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 124                                 SD_CMD1, 0xFF, (u8)(cmd->arg >> 24));
 125                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 126                                 SD_CMD2, 0xFF, (u8)(cmd->arg >> 16));
 127                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 128                                 SD_CMD3, 0xFF, (u8)(cmd->arg >> 8));
 129                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 130                                 SD_CMD4, 0xFF, (u8)cmd->arg);
 131         } else {
 132                 trans_mode = SD_TM_AUTO_READ_3;
 133         }
 134
 135         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, (u8)byte_cnt);
 136         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_H,
 137                         0xFF, (u8)(byte_cnt >> 8));
 138         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_L, 0xFF, 1);
 139         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_H, 0xFF, 0);
 140
 141         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF,
 142                         SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
 143                         SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_6);
 144         if (trans_mode != SD_TM_AUTO_TUNING)
 145                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 146                                 CARD_DATA_SOURCE, 0x01, PINGPONG_BUFFER);
 147
 148         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER,
 149                         0xFF, trans_mode | SD_TRANSFER_START);
 150         rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
 151                         SD_TRANSFER_END, SD_TRANSFER_END);
 152
 153         if (cmd != NULL) {
 154                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD1, 0, 0);
 155                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD2, 0, 0);
 156                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD3, 0, 0);
 157                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD4, 0, 0);
 158         }
 159
 160         err = rtsx_usb_send_cmd(ucr, MODE_CR, timeout);
 161         if (err) {
 162                 dev_dbg(sdmmc_dev(host),
 163                         "rtsx_usb_send_cmd failed (err = %d)\n", err);
 164                 return err;
 165         }
 166
 167         err = rtsx_usb_get_rsp(ucr, !cmd ? 1 : 5, timeout);
 168         if (err || (ucr->rsp_buf[0] & SD_TRANSFER_ERR)) {
 169                 sd_print_debug_regs(host);
 170
 171                 if (!err) {
 172                         dev_dbg(sdmmc_dev(host),
 173                                 "Transfer failed (SD_TRANSFER = %02x)\n",
 174                                 ucr->rsp_buf[0]);
 175                         err = -EIO;
 176                 } else {
 177                         dev_dbg(sdmmc_dev(host),
 178                                 "rtsx_usb_get_rsp failed (err = %d)\n", err);
 179                 }
 180
 181                 return err;
 182         }
 183
 184         if (cmd != NULL) {
 185                 cmd->resp[0] = get_unaligned_be32(ucr->rsp_buf + 1);
 186                 dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
 187                                 cmd->resp[0]);
 188         }
 189
 190         if (buf && buf_len) {
 191                 /* 2-byte aligned part */
 192                 err = rtsx_usb_read_ppbuf(ucr, buf, byte_cnt - (byte_cnt % 2));
 193                 if (err) {
 194                         dev_dbg(sdmmc_dev(host),
 195                                 "rtsx_usb_read_ppbuf failed (err = %d)\n", err);
 196                         return err;
 197                 }
 198
 199                 /* unaligned byte */
 200                 if (byte_cnt % 2)
 201                         return rtsx_usb_read_register(ucr,
 202                                         PPBUF_BASE2 + byte_cnt,
 203                                         buf + byte_cnt - 1);
 204         }
 205
 206         return 0;
 207 }
 208
 209 static int sd_write_data(struct rtsx_usb_sdmmc *host, struct mmc_command *cmd,
 210                 u16 byte_cnt, u8 *buf, int buf_len, int timeout)
 211 {
 212         struct rtsx_ucr *ucr = host->ucr;
 213         int err;
 214         u8 trans_mode;
 215
 216         if (!buf)
 217                 buf_len = 0;
 218
 219         if (buf && buf_len) {
 220                 err = rtsx_usb_write_ppbuf(ucr, buf, buf_len);
 221                 if (err) {
 222                         dev_dbg(sdmmc_dev(host),
 223                                 "rtsx_usb_write_ppbuf failed (err = %d)\n",
 224                                 err);
 225                         return err;
 226                 }
 227         }
 228
 229         trans_mode = (cmd != NULL) ? SD_TM_AUTO_WRITE_2 : SD_TM_AUTO_WRITE_3;
 230         rtsx_usb_init_cmd(ucr);
 231
 232         if (cmd != NULL) {
 233                 dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD%d\n", __func__,
 234                                 cmd->opcode);
 235                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 236                                 SD_CMD0, 0xFF, (u8)(cmd->opcode) | 0x40);
 237                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 238                                 SD_CMD1, 0xFF, (u8)(cmd->arg >> 24));
 239                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 240                                 SD_CMD2, 0xFF, (u8)(cmd->arg >> 16));
 241                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 242                                 SD_CMD3, 0xFF, (u8)(cmd->arg >> 8));
 243                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 244                                 SD_CMD4, 0xFF, (u8)cmd->arg);
 245         }
 246
 247         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, (u8)byte_cnt);
 248         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_H,
 249                         0xFF, (u8)(byte_cnt >> 8));
 250         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_L, 0xFF, 1);
 251         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_H, 0xFF, 0);
 252
 253         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF,
 254                 SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
 255                 SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_6);
 256         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
 257                         CARD_DATA_SOURCE, 0x01, PINGPONG_BUFFER);
 258
 259         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
 260                         trans_mode | SD_TRANSFER_START);
 261         rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
 262                         SD_TRANSFER_END, SD_TRANSFER_END);
 263
 264         if (cmd != NULL) {
 265                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD1, 0, 0);
 266                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD2, 0, 0);
 267                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD3, 0, 0);
 268                 rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD4, 0, 0);
 269         }
 270
 271         err = rtsx_usb_send_cmd(ucr, MODE_CR, timeout);
 272         if (err) {
 273                 dev_dbg(sdmmc_dev(host),
 274                         "rtsx_usb_send_cmd failed (err = %d)\n", err);
 275                 return err;
 276         }
 277
 278         err = rtsx_usb_get_rsp(ucr, !cmd ? 1 : 5, timeout);
 279         if (err) {
 280                 sd_print_debug_regs(host);
 281                 dev_dbg(sdmmc_dev(host),
 282                         "rtsx_usb_get_rsp failed (err = %d)\n", err);
 283                 return err;
 284         }
 285
 286         if (cmd != NULL) {
 287                 cmd->resp[0] = get_unaligned_be32(ucr->rsp_buf + 1);
 288                 dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
 289                                 cmd->resp[0]);
 290         }
 291
 292         return 0;
 293 }
 294
 295 static void sd_send_cmd_get_rsp(struct rtsx_usb_sdmmc *host,
 296                 struct mmc_command *cmd)
 297 {
 298         struct rtsx_ucr *ucr = host->ucr;
 299         u8 cmd_idx = (u8)cmd->opcode;
 300         u32 arg = cmd->arg;
 301         int err = 0;
 302         int timeout = 100;
 303         int i;
 304         u8 *ptr;
 305         int stat_idx = 0;
 306         int len = 2;
 307         u8 rsp_type;
 308
 309         dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
 310                         __func__, cmd_idx, arg);
 311
 312         /* Response type:
 313          * R0
 314          * R1, R5, R6, R7
 315          * R1b
 316          * R2
 317          * R3, R4
 318          */
 319         switch (mmc_resp_type(cmd)) {
 320         case MMC_RSP_NONE:
 321                 rsp_type = SD_RSP_TYPE_R0;
 322                 break;
 323         case MMC_RSP_R1:
 324                 rsp_type = SD_RSP_TYPE_R1;
 325                 break;
 326         case MMC_RSP_R1_NO_CRC:
 327                 rsp_type = SD_RSP_TYPE_R1 | SD_NO_CHECK_CRC7;
 328                 break;
 329         case MMC_RSP_R1B:
 330                 rsp_type = SD_RSP_TYPE_R1b;
 331                 break;
 332         case MMC_RSP_R2:
 333                 rsp_type = SD_RSP_TYPE_R2;
 334                 break;
 335         case MMC_RSP_R3:
 336                 rsp_type = SD_RSP_TYPE_R3;
 337                 break;
 338         default:
 339                 dev_dbg(sdmmc_dev(host), "cmd->flag is not valid\n");
 340                 err = -EINVAL;
 341                 goto out;
 342         }
 343
 344         if (rsp_type == SD_RSP_TYPE_R1b)
 345                 timeout = cmd->busy_timeout ? cmd->busy_timeout : 3000;
 346
 347         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
 348                 err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
 349                                 SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
 350                                 SD_CLK_TOGGLE_EN);
 351                 if (err)
 352                         goto out;
 353         }
 354
 355         rtsx_usb_init_cmd(ucr);
 356
 357         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD0, 0xFF, 0x40 | cmd_idx);
 358         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD1, 0xFF, (u8)(arg >> 24));
 359         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD2, 0xFF, (u8)(arg >> 16));
 360         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD3, 0xFF, (u8)(arg >> 8));
 361         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD4, 0xFF, (u8)arg);
 362
 363         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF, rsp_type);
 364         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DATA_SOURCE,
 365                         0x01, PINGPONG_BUFFER);
 366         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER,
 367                         0xFF, SD_TM_CMD_RSP | SD_TRANSFER_START);
 368         rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
 369                      SD_TRANSFER_END | SD_STAT_IDLE,
 370                      SD_TRANSFER_END | SD_STAT_IDLE);
 371
 372         if (rsp_type == SD_RSP_TYPE_R2) {
 373                 /* Read data from ping-pong buffer */
 374                 for (i = PPBUF_BASE2; i < PPBUF_BASE2 + 16; i++)
 375                         rtsx_usb_add_cmd(ucr, READ_REG_CMD, (u16)i, 0, 0);
 376                 stat_idx = 16;
 377         } else if (rsp_type != SD_RSP_TYPE_R0) {
 378                 /* Read data from SD_CMDx registers */
 379                 for (i = SD_CMD0; i <= SD_CMD4; i++)
 380                         rtsx_usb_add_cmd(ucr, READ_REG_CMD, (u16)i, 0, 0);
 381                 stat_idx = 5;
 382         }
 383         len += stat_idx;
 384
 385         rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_STAT1, 0, 0);
 386
 387         err = rtsx_usb_send_cmd(ucr, MODE_CR, 100);
 388         if (err) {
 389                 dev_dbg(sdmmc_dev(host),
 390                         "rtsx_usb_send_cmd error (err = %d)\n", err);
 391                 goto out;
 392         }
 393
 394         err = rtsx_usb_get_rsp(ucr, len, timeout);
 395         if (err || (ucr->rsp_buf[0] & SD_TRANSFER_ERR)) {
 396                 sd_print_debug_regs(host);
 397                 sd_clear_error(host);
 398
 399                 if (!err) {
 400                         dev_dbg(sdmmc_dev(host),
 401                                 "Transfer failed (SD_TRANSFER = %02x)\n",
 402                                         ucr->rsp_buf[0]);
 403                         err = -EIO;
 404                 } else {
 405                         dev_dbg(sdmmc_dev(host),
 406                                 "rtsx_usb_get_rsp failed (err = %d)\n", err);
 407                 }
 408
 409                 goto out;
 410         }
 411
 412         if (rsp_type == SD_RSP_TYPE_R0) {
 413                 err = 0;
 414                 goto out;
 415         }
 416
 417         /* Skip result of CHECK_REG_CMD */
 418         ptr = ucr->rsp_buf + 1;
 419
 420         /* Check (Start,Transmission) bit of Response */
 421         if ((ptr[0] & 0xC0) != 0) {
 422                 err = -EILSEQ;
 423                 dev_dbg(sdmmc_dev(host), "Invalid response bit\n");
 424                 goto out;
 425         }
 426
 427         /* Check CRC7 */
 428         if (!(rsp_type & SD_NO_CHECK_CRC7)) {
 429                 if (ptr[stat_idx] & SD_CRC7_ERR) {
 430                         err = -EILSEQ;
 431                         dev_dbg(sdmmc_dev(host), "CRC7 error\n");
 432                         goto out;
 433                 }
 434         }
 435
 436         if (rsp_type == SD_RSP_TYPE_R2) {
 437                 /*
 438                  * The controller offloads the last byte {CRC-7, end bit 1'b1}
 439                  * of response type R2. Assign dummy CRC, 0, and end bit to the
 440                  * byte(ptr[16], goes into the LSB of resp[3] later).
 441                  */
 442                 ptr[16] = 1;
 443
 444                 for (i = 0; i < 4; i++) {
 445                         cmd->resp[i] = get_unaligned_be32(ptr + 1 + i * 4);
 446                         dev_dbg(sdmmc_dev(host), "cmd->resp[%d] = 0x%08x\n",
 447                                         i, cmd->resp[i]);
 448                 }
 449         } else {
 450                 cmd->resp[0] = get_unaligned_be32(ptr + 1);
 451                 dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
 452                                 cmd->resp[0]);
 453         }
 454
 455 out:
 456         cmd->error = err;
 457 }
 458
 459 static int sd_rw_multi(struct rtsx_usb_sdmmc *host, struct mmc_request *mrq)
 460 {
 461         struct rtsx_ucr *ucr = host->ucr;
 462         struct mmc_data *data = mrq->data;
 463         int read = (data->flags & MMC_DATA_READ) ? 1 : 0;
 464         u8 cfg2, trans_mode;
 465         int err;
 466         u8 flag;
 467         size_t data_len = data->blksz * data->blocks;
 468         unsigned int pipe;
 469
 470         if (read) {
 471                 dev_dbg(sdmmc_dev(host), "%s: read %zu bytes\n",
 472                                 __func__, data_len);
 473                 cfg2 = SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
 474                         SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_0;
 475                 trans_mode = SD_TM_AUTO_READ_3;
 476         } else {
 477                 dev_dbg(sdmmc_dev(host), "%s: write %zu bytes\n",
 478                                 __func__, data_len);
 479                 cfg2 = SD_NO_CALCULATE_CRC7 | SD_CHECK_CRC16 |
 480                         SD_NO_WAIT_BUSY_END | SD_NO_CHECK_CRC7 | SD_RSP_LEN_0;
 481                 trans_mode = SD_TM_AUTO_WRITE_3;
 482         }
 483
 484         rtsx_usb_init_cmd(ucr);
 485
 486         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, 0x00);
 487         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_H, 0xFF, 0x02);
 488         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_L,
 489                         0xFF, (u8)data->blocks);
 490         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_H,
 491                         0xFF, (u8)(data->blocks >> 8));
 492
 493         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DATA_SOURCE,
 494                         0x01, RING_BUFFER);
 495
 496         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC3,
 497                         0xFF, (u8)(data_len >> 24));
 498         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC2,
 499                         0xFF, (u8)(data_len >> 16));
 500         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC1,
 501                         0xFF, (u8)(data_len >> 8));
 502         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC0,
 503                         0xFF, (u8)data_len);
 504         if (read) {
 505                 flag = MODE_CDIR;
 506                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_CTL,
 507                                 0x03 | DMA_PACK_SIZE_MASK,
 508                                 DMA_DIR_FROM_CARD | DMA_EN | DMA_512);
 509         } else {
 510                 flag = MODE_CDOR;
 511                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_CTL,
 512                                 0x03 | DMA_PACK_SIZE_MASK,
 513                                 DMA_DIR_TO_CARD | DMA_EN | DMA_512);
 514         }
 515
 516         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF, cfg2);
 517         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
 518                         trans_mode | SD_TRANSFER_START);
 519         rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
 520                         SD_TRANSFER_END, SD_TRANSFER_END);
 521
 522         err = rtsx_usb_send_cmd(ucr, flag, 100);
 523         if (err)
 524                 return err;
 525
 526         if (read)
 527                 pipe = usb_rcvbulkpipe(ucr->pusb_dev, EP_BULK_IN);
 528         else
 529                 pipe = usb_sndbulkpipe(ucr->pusb_dev, EP_BULK_OUT);
 530
 531         err = rtsx_usb_transfer_data(ucr, pipe, data->sg, data_len,
 532                         data->sg_len,  NULL, 10000);
 533         if (err) {
 534                 dev_dbg(sdmmc_dev(host), "rtsx_usb_transfer_data error %d\n"
 535                                 , err);
 536                 sd_clear_error(host);
 537                 return err;
 538         }
 539
 540         return rtsx_usb_get_rsp(ucr, 1, 2000);
 541 }
 542
 543 static inline void sd_enable_initial_mode(struct rtsx_usb_sdmmc *host)
 544 {
 545         rtsx_usb_write_register(host->ucr, SD_CFG1,
 546                         SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_128);
 547 }
 548
 549 static inline void sd_disable_initial_mode(struct rtsx_usb_sdmmc *host)
 550 {
 551         rtsx_usb_write_register(host->ucr, SD_CFG1,
 552                         SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_0);
 553 }
 554
 555 static void sd_normal_rw(struct rtsx_usb_sdmmc *host,
 556                 struct mmc_request *mrq)
 557 {
 558         struct mmc_command *cmd = mrq->cmd;
 559         struct mmc_data *data = mrq->data;
 560         u8 *buf;
 561
 562         buf = kzalloc(data->blksz, GFP_NOIO);
 563         if (!buf) {
 564                 cmd->error = -ENOMEM;
 565                 return;
 566         }
 567
 568         if (data->flags & MMC_DATA_READ) {
 569                 if (host->initial_mode)
 570                         sd_disable_initial_mode(host);
 571
 572                 cmd->error = sd_read_data(host, cmd, (u16)data->blksz, buf,
 573                                 data->blksz, 200);
 574
 575                 if (host->initial_mode)
 576                         sd_enable_initial_mode(host);
 577
 578                 sg_copy_from_buffer(data->sg, data->sg_len, buf, data->blksz);
 579         } else {
 580                 sg_copy_to_buffer(data->sg, data->sg_len, buf, data->blksz);
 581
 582                 cmd->error = sd_write_data(host, cmd, (u16)data->blksz, buf,
 583                                 data->blksz, 200);
 584         }
 585
 586         kfree(buf);
 587 }
 588
 589 static int sd_change_phase(struct rtsx_usb_sdmmc *host, u8 sample_point, int tx)
 590 {
 591         struct rtsx_ucr *ucr = host->ucr;
 592         int err;
 593
 594         dev_dbg(sdmmc_dev(host), "%s: %s sample_point = %d\n",
 595                         __func__, tx ? "TX" : "RX", sample_point);
 596
 597         rtsx_usb_init_cmd(ucr);
 598
 599         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV, CLK_CHANGE, CLK_CHANGE);
 600
 601         if (tx)
 602                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
 603                                 0x0F, sample_point);
 604         else
 605                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK1_CTL,
 606                                 0x0F, sample_point);
 607
 608         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL, PHASE_NOT_RESET, 0);
 609         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
 610                         PHASE_NOT_RESET, PHASE_NOT_RESET);
 611         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV, CLK_CHANGE, 0);
 612         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1, SD_ASYNC_FIFO_RST, 0);
 613
 614         err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
 615         if (err)
 616                 return err;
 617
 618         return 0;
 619 }
 620
 621 static inline u32 get_phase_point(u32 phase_map, unsigned int idx)
 622 {
 623         idx &= MAX_PHASE;
 624         return phase_map & (1 << idx);
 625 }
 626
 627 static int get_phase_len(u32 phase_map, unsigned int idx)
 628 {
 629         int i;
 630
 631         for (i = 0; i < MAX_PHASE + 1; i++) {
 632                 if (get_phase_point(phase_map, idx + i) == 0)
 633                         return i;
 634         }
 635         return MAX_PHASE + 1;
 636 }
 637
 638 static u8 sd_search_final_phase(struct rtsx_usb_sdmmc *host, u32 phase_map)
 639 {
 640         int start = 0, len = 0;
 641         int start_final = 0, len_final = 0;
 642         u8 final_phase = 0xFF;
 643
 644         if (phase_map == 0) {
 645                 dev_dbg(sdmmc_dev(host), "Phase: [map:%x]\n", phase_map);
 646                 return final_phase;
 647         }
 648
 649         while (start < MAX_PHASE + 1) {
 650                 len = get_phase_len(phase_map, start);
 651                 if (len_final < len) {
 652                         start_final = start;
 653                         len_final = len;
 654                 }
 655                 start += len ? len : 1;
 656         }
 657
 658         final_phase = (start_final + len_final / 2) & MAX_PHASE;
 659         dev_dbg(sdmmc_dev(host), "Phase: [map:%x] [maxlen:%d] [final:%d]\n",
 660                 phase_map, len_final, final_phase);
 661
 662         return final_phase;
 663 }
 664
 665 static void sd_wait_data_idle(struct rtsx_usb_sdmmc *host)
 666 {
 667         int err, i;
 668         u8 val = 0;
 669
 670         for (i = 0; i < 100; i++) {
 671                 err = rtsx_usb_ep0_read_register(host->ucr,
 672                                 SD_DATA_STATE, &val);
 673                 if (val & SD_DATA_IDLE)
 674                         return;
 675
 676                 usleep_range(100, 1000);
 677         }
 678 }
 679
 680 static int sd_tuning_rx_cmd(struct rtsx_usb_sdmmc *host,
 681                 u8 opcode, u8 sample_point)
 682 {
 683         int err;
 684         struct mmc_command cmd = {};
 685
 686         err = sd_change_phase(host, sample_point, 0);
 687         if (err)
 688                 return err;
 689
 690         cmd.opcode = MMC_SEND_TUNING_BLOCK;
 691         err = sd_read_data(host, &cmd, 0x40, NULL, 0, 100);
 692         if (err) {
 693                 /* Wait till SD DATA IDLE */
 694                 sd_wait_data_idle(host);
 695                 sd_clear_error(host);
 696                 return err;
 697         }
 698
 699         return 0;
 700 }
 701
 702 static void sd_tuning_phase(struct rtsx_usb_sdmmc *host,
 703                 u8 opcode, u16 *phase_map)
 704 {
 705         int err, i;
 706         u16 raw_phase_map = 0;
 707
 708         for (i = MAX_PHASE; i >= 0; i--) {
 709                 err = sd_tuning_rx_cmd(host, opcode, (u8)i);
 710                 if (!err)
 711                         raw_phase_map |= 1 << i;
 712         }
 713
 714         if (phase_map)
 715                 *phase_map = raw_phase_map;
 716 }
 717
 718 static int sd_tuning_rx(struct rtsx_usb_sdmmc *host, u8 opcode)
 719 {
 720         int err, i;
 721         u16 raw_phase_map[RX_TUNING_CNT] = {0}, phase_map;
 722         u8 final_phase;
 723
 724         /* setting fixed default TX phase */
 725         err = sd_change_phase(host, 0x01, 1);
 726         if (err) {
 727                 dev_dbg(sdmmc_dev(host), "TX phase setting failed\n");
 728                 return err;
 729         }
 730
 731         /* tuning RX phase */
 732         for (i = 0; i < RX_TUNING_CNT; i++) {
 733                 sd_tuning_phase(host, opcode, &(raw_phase_map[i]));
 734
 735                 if (raw_phase_map[i] == 0)
 736                         break;
 737         }
 738
 739         phase_map = 0xFFFF;
 740         for (i = 0; i < RX_TUNING_CNT; i++) {
 741                 dev_dbg(sdmmc_dev(host), "RX raw_phase_map[%d] = 0x%04x\n",
 742                                 i, raw_phase_map[i]);
 743                 phase_map &= raw_phase_map[i];
 744         }
 745         dev_dbg(sdmmc_dev(host), "RX phase_map = 0x%04x\n", phase_map);
 746
 747         if (phase_map) {
 748                 final_phase = sd_search_final_phase(host, phase_map);
 749                 if (final_phase == 0xFF)
 750                         return -EINVAL;
 751
 752                 err = sd_change_phase(host, final_phase, 0);
 753                 if (err)
 754                         return err;
 755         } else {
 756                 return -EINVAL;
 757         }
 758
 759         return 0;
 760 }
 761
 762 static int sdmmc_get_ro(struct mmc_host *mmc)
 763 {
 764         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
 765         struct rtsx_ucr *ucr = host->ucr;
 766         int err;
 767         u16 val;
 768
 769         if (host->host_removal)
 770                 return -ENOMEDIUM;
 771
 772         mutex_lock(&ucr->dev_mutex);
 773
 774         /* Check SD card detect */
 775         err = rtsx_usb_get_card_status(ucr, &val);
 776
 777         mutex_unlock(&ucr->dev_mutex);
 778
 779
 780         /* Treat failed detection as non-ro */
 781         if (err)
 782                 return 0;
 783
 784         if (val & SD_WP)
 785                 return 1;
 786
 787         return 0;
 788 }
 789
 790 static int sdmmc_get_cd(struct mmc_host *mmc)
 791 {
 792         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
 793         struct rtsx_ucr *ucr = host->ucr;
 794         int err;
 795         u16 val;
 796
 797         if (host->host_removal)
 798                 return -ENOMEDIUM;
 799
 800         mutex_lock(&ucr->dev_mutex);
 801
 802         /* Check SD card detect */
 803         err = rtsx_usb_get_card_status(ucr, &val);
 804
 805         mutex_unlock(&ucr->dev_mutex);
 806
 807         /* Treat failed detection as non-exist */
 808         if (err)
 809                 goto no_card;
 810
 811         if (val & SD_CD) {
 812                 host->card_exist = true;
 813                 return 1;
 814         }
 815
 816 no_card:
 817         host->card_exist = false;
 818         return 0;
 819 }
 820
 821 static void sdmmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 822 {
 823         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
 824         struct rtsx_ucr *ucr = host->ucr;
 825         struct mmc_command *cmd = mrq->cmd;
 826         struct mmc_data *data = mrq->data;
 827         unsigned int data_size = 0;
 828
 829         dev_dbg(sdmmc_dev(host), "%s\n", __func__);
 830
 831         if (host->host_removal) {
 832                 cmd->error = -ENOMEDIUM;
 833                 goto finish;
 834         }
 835
 836         if ((!host->card_exist)) {
 837                 cmd->error = -ENOMEDIUM;
 838                 goto finish_detect_card;
 839         }
 840
 841         mutex_lock(&ucr->dev_mutex);
 842
 843         mutex_lock(&host->host_mutex);
 844         host->mrq = mrq;
 845         mutex_unlock(&host->host_mutex);
 846
 847         if (mrq->data)
 848                 data_size = data->blocks * data->blksz;
 849
 850         if (!data_size) {
 851                 sd_send_cmd_get_rsp(host, cmd);
 852         } else if ((!(data_size % 512) && cmd->opcode != MMC_SEND_EXT_CSD) ||
 853                    mmc_op_multi(cmd->opcode)) {
 854                 sd_send_cmd_get_rsp(host, cmd);
 855
 856                 if (!cmd->error) {
 857                         sd_rw_multi(host, mrq);
 858
 859                         if (mmc_op_multi(cmd->opcode) && mrq->stop) {
 860                                 sd_send_cmd_get_rsp(host, mrq->stop);
 861                                 rtsx_usb_write_register(ucr, MC_FIFO_CTL,
 862                                                 FIFO_FLUSH, FIFO_FLUSH);
 863                         }
 864                 }
 865         } else {
 866                 sd_normal_rw(host, mrq);
 867         }
 868
 869         if (mrq->data) {
 870                 if (cmd->error || data->error)
 871                         data->bytes_xfered = 0;
 872                 else
 873                         data->bytes_xfered = data->blocks * data->blksz;
 874         }
 875
 876         mutex_unlock(&ucr->dev_mutex);
 877
 878 finish_detect_card:
 879         if (cmd->error) {
 880                 /*
 881                  * detect card when fail to update card existence state and
 882                  * speed up card removal when retry
 883                  */
 884                 sdmmc_get_cd(mmc);
 885                 dev_dbg(sdmmc_dev(host), "cmd->error = %d\n", cmd->error);
 886         }
 887
 888 finish:
 889         mutex_lock(&host->host_mutex);
 890         host->mrq = NULL;
 891         mutex_unlock(&host->host_mutex);
 892
 893         mmc_request_done(mmc, mrq);
 894 }
 895
 896 static int sd_set_bus_width(struct rtsx_usb_sdmmc *host,
 897                 unsigned char bus_width)
 898 {
 899         int err = 0;
 900         static const u8 width[] = {
 901                 [MMC_BUS_WIDTH_1] = SD_BUS_WIDTH_1BIT,
 902                 [MMC_BUS_WIDTH_4] = SD_BUS_WIDTH_4BIT,
 903                 [MMC_BUS_WIDTH_8] = SD_BUS_WIDTH_8BIT,
 904         };
 905
 906         if (bus_width <= MMC_BUS_WIDTH_8)
 907                 err = rtsx_usb_write_register(host->ucr, SD_CFG1,
 908                                 0x03, width[bus_width]);
 909
 910         return err;
 911 }
 912
 913 static int sd_pull_ctl_disable_lqfp48(struct rtsx_ucr *ucr)
 914 {
 915         rtsx_usb_init_cmd(ucr);
 916
 917         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0x55);
 918         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
 919         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
 920         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
 921         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x55);
 922         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0xA5);
 923
 924         return rtsx_usb_send_cmd(ucr, MODE_C, 100);
 925 }
 926
 927 static int sd_pull_ctl_disable_qfn24(struct rtsx_ucr *ucr)
 928 {
 929         rtsx_usb_init_cmd(ucr);
 930
 931         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0x65);
 932         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
 933         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
 934         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
 935         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x56);
 936         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0x59);
 937
 938         return rtsx_usb_send_cmd(ucr, MODE_C, 100);
 939 }
 940
 941 static int sd_pull_ctl_enable_lqfp48(struct rtsx_ucr *ucr)
 942 {
 943         rtsx_usb_init_cmd(ucr);
 944
 945         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0xAA);
 946         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0xAA);
 947         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0xA9);
 948         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
 949         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x55);
 950         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0xA5);
 951
 952         return rtsx_usb_send_cmd(ucr, MODE_C, 100);
 953 }
 954
 955 static int sd_pull_ctl_enable_qfn24(struct rtsx_ucr *ucr)
 956 {
 957         rtsx_usb_init_cmd(ucr);
 958
 959         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0xA5);
 960         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x9A);
 961         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0xA5);
 962         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x9A);
 963         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x65);
 964         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0x5A);
 965
 966         return rtsx_usb_send_cmd(ucr, MODE_C, 100);
 967 }
 968
 969 static int sd_power_on(struct rtsx_usb_sdmmc *host)
 970 {
 971         struct rtsx_ucr *ucr = host->ucr;
 972         int err;
 973
 974         dev_dbg(sdmmc_dev(host), "%s\n", __func__);
 975         rtsx_usb_init_cmd(ucr);
 976         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_SELECT, 0x07, SD_MOD_SEL);
 977         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_SHARE_MODE,
 978                         CARD_SHARE_MASK, CARD_SHARE_SD);
 979         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_EN,
 980                         SD_CLK_EN, SD_CLK_EN);
 981         err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
 982         if (err)
 983                 return err;
 984
 985         if (CHECK_PKG(ucr, LQFP48))
 986                 err = sd_pull_ctl_enable_lqfp48(ucr);
 987         else
 988                 err = sd_pull_ctl_enable_qfn24(ucr);
 989         if (err)
 990                 return err;
 991
 992         err = rtsx_usb_write_register(ucr, CARD_PWR_CTL,
 993                         POWER_MASK, PARTIAL_POWER_ON);
 994         if (err)
 995                 return err;
 996
 997         usleep_range(800, 1000);
 998
 999         rtsx_usb_init_cmd(ucr);
1000         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
1001                         POWER_MASK|LDO3318_PWR_MASK, POWER_ON|LDO_ON);
1002         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_OE,
1003                         SD_OUTPUT_EN, SD_OUTPUT_EN);
1004
1005         return rtsx_usb_send_cmd(ucr, MODE_C, 100);
1006 }
1007
1008 static int sd_power_off(struct rtsx_usb_sdmmc *host)
1009 {
1010         struct rtsx_ucr *ucr = host->ucr;
1011         int err;
1012
1013         dev_dbg(sdmmc_dev(host), "%s\n", __func__);
1014         rtsx_usb_init_cmd(ucr);
1015
1016         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_EN, SD_CLK_EN, 0);
1017         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_OE, SD_OUTPUT_EN, 0);
1018         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
1019                         POWER_MASK, POWER_OFF);
1020         rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
1021                         POWER_MASK|LDO3318_PWR_MASK, POWER_OFF|LDO_SUSPEND);
1022
1023         err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
1024         if (err)
1025                 return err;
1026
1027         if (CHECK_PKG(ucr, LQFP48))
1028                         return sd_pull_ctl_disable_lqfp48(ucr);
1029         return sd_pull_ctl_disable_qfn24(ucr);
1030 }
1031
1032 static int sd_set_power_mode(struct rtsx_usb_sdmmc *host,
1033                 unsigned char power_mode)
1034 {
1035         int err;
1036
1037         if (power_mode != MMC_POWER_OFF)
1038                 power_mode = MMC_POWER_ON;
1039
1040         if (power_mode == host->power_mode)
1041                 return 0;
1042
1043         if (power_mode == MMC_POWER_OFF) {
1044                 err = sd_power_off(host);
1045                 pm_runtime_put(sdmmc_dev(host));
1046         } else {
1047                 pm_runtime_get_sync(sdmmc_dev(host));
1048                 err = sd_power_on(host);
1049         }
1050
1051         if (!err)
1052                 host->power_mode = power_mode;
1053
1054         return err;
1055 }
1056
1057 static int sd_set_timing(struct rtsx_usb_sdmmc *host,
1058                 unsigned char timing, bool *ddr_mode)
1059 {
1060         struct rtsx_ucr *ucr = host->ucr;
1061         int err;
1062
1063         *ddr_mode = false;
1064
1065         rtsx_usb_init_cmd(ucr);
1066
1067         switch (timing) {
1068         case MMC_TIMING_UHS_SDR104:
1069         case MMC_TIMING_UHS_SDR50:
1070                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
1071                                 0x0C | SD_ASYNC_FIFO_RST,
1072                                 SD_30_MODE | SD_ASYNC_FIFO_RST);
1073                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1074                                 CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
1075                 break;
1076
1077         case MMC_TIMING_UHS_DDR50:
1078                 *ddr_mode = true;
1079
1080                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
1081                                 0x0C | SD_ASYNC_FIFO_RST,
1082                                 SD_DDR_MODE | SD_ASYNC_FIFO_RST);
1083                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1084                                 CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
1085                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
1086                                 DDR_VAR_TX_CMD_DAT, DDR_VAR_TX_CMD_DAT);
1087                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1088                                 DDR_VAR_RX_DAT | DDR_VAR_RX_CMD,
1089                                 DDR_VAR_RX_DAT | DDR_VAR_RX_CMD);
1090                 break;
1091
1092         case MMC_TIMING_MMC_HS:
1093         case MMC_TIMING_SD_HS:
1094                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
1095                                 0x0C, SD_20_MODE);
1096                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1097                                 CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
1098                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
1099                                 SD20_TX_SEL_MASK, SD20_TX_14_AHEAD);
1100                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1101                                 SD20_RX_SEL_MASK, SD20_RX_14_DELAY);
1102                 break;
1103
1104         default:
1105                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
1106                                 SD_CFG1, 0x0C, SD_20_MODE);
1107                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
1108                                 CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
1109                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
1110                                 SD_PUSH_POINT_CTL, 0xFF, 0);
1111                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
1112                                 SD20_RX_SEL_MASK, SD20_RX_POS_EDGE);
1113                 break;
1114         }
1115
1116         err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
1117
1118         return err;
1119 }
1120
1121 static void sdmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1122 {
1123         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1124         struct rtsx_ucr *ucr = host->ucr;
1125
1126         dev_dbg(sdmmc_dev(host), "%s\n", __func__);
1127         mutex_lock(&ucr->dev_mutex);
1128
1129         sd_set_power_mode(host, ios->power_mode);
1130         sd_set_bus_width(host, ios->bus_width);
1131         sd_set_timing(host, ios->timing, &host->ddr_mode);
1132
1133         host->vpclk = false;
1134         host->double_clk = true;
1135
1136         switch (ios->timing) {
1137         case MMC_TIMING_UHS_SDR104:
1138         case MMC_TIMING_UHS_SDR50:
1139                 host->ssc_depth = SSC_DEPTH_2M;
1140                 host->vpclk = true;
1141                 host->double_clk = false;
1142                 break;
1143         case MMC_TIMING_UHS_DDR50:
1144         case MMC_TIMING_UHS_SDR25:
1145                 host->ssc_depth = SSC_DEPTH_1M;
1146                 break;
1147         default:
1148                 host->ssc_depth = SSC_DEPTH_512K;
1149                 break;
1150         }
1151
1152         host->initial_mode = (ios->clock <= 1000000) ? true : false;
1153         host->clock = ios->clock;
1154
1155         rtsx_usb_switch_clock(host->ucr, host->clock, host->ssc_depth,
1156                         host->initial_mode, host->double_clk, host->vpclk);
1157
1158         mutex_unlock(&ucr->dev_mutex);
1159         dev_dbg(sdmmc_dev(host), "%s end\n", __func__);
1160 }
1161
1162 static int sdmmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1163 {
1164         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1165         struct rtsx_ucr *ucr = host->ucr;
1166         int err = 0;
1167
1168         dev_dbg(sdmmc_dev(host), "%s: signal_voltage = %d\n",
1169                         __func__, ios->signal_voltage);
1170
1171         if (host->host_removal)
1172                 return -ENOMEDIUM;
1173
1174         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_120)
1175                 return -EPERM;
1176
1177         mutex_lock(&ucr->dev_mutex);
1178
1179         err = rtsx_usb_card_exclusive_check(ucr, RTSX_USB_SD_CARD);
1180         if (err) {
1181                 mutex_unlock(&ucr->dev_mutex);
1182                 return err;
1183         }
1184
1185         /* Let mmc core do the busy checking, simply stop the forced-toggle
1186          * clock(while issuing CMD11) and switch voltage.
1187          */
1188         rtsx_usb_init_cmd(ucr);
1189
1190         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1191                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PAD_CTL,
1192                                 SD_IO_USING_1V8, SD_IO_USING_3V3);
1193                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, LDO_POWER_CFG,
1194                                 TUNE_SD18_MASK, TUNE_SD18_3V3);
1195         } else {
1196                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BUS_STAT,
1197                                 SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
1198                                 SD_CLK_FORCE_STOP);
1199                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PAD_CTL,
1200                                 SD_IO_USING_1V8, SD_IO_USING_1V8);
1201                 rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, LDO_POWER_CFG,
1202                                 TUNE_SD18_MASK, TUNE_SD18_1V8);
1203         }
1204
1205         err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
1206         mutex_unlock(&ucr->dev_mutex);
1207
1208         return err;
1209 }
1210
1211 static int sdmmc_card_busy(struct mmc_host *mmc)
1212 {
1213         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1214         struct rtsx_ucr *ucr = host->ucr;
1215         int err;
1216         u8 stat;
1217         u8 mask = SD_DAT3_STATUS | SD_DAT2_STATUS | SD_DAT1_STATUS
1218                 | SD_DAT0_STATUS;
1219
1220         dev_dbg(sdmmc_dev(host), "%s\n", __func__);
1221
1222         mutex_lock(&ucr->dev_mutex);
1223
1224         err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
1225                         SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
1226                         SD_CLK_TOGGLE_EN);
1227         if (err)
1228                 goto out;
1229
1230         mdelay(1);
1231
1232         err = rtsx_usb_read_register(ucr, SD_BUS_STAT, &stat);
1233         if (err)
1234                 goto out;
1235
1236         err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
1237                         SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
1238 out:
1239         mutex_unlock(&ucr->dev_mutex);
1240
1241         if (err)
1242                 return err;
1243
1244         /* check if any pin between dat[0:3] is low */
1245         if ((stat & mask) != mask)
1246                 return 1;
1247         else
1248                 return 0;
1249 }
1250
1251 static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
1252 {
1253         struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
1254         struct rtsx_ucr *ucr = host->ucr;
1255         int err = 0;
1256
1257         if (host->host_removal)
1258                 return -ENOMEDIUM;
1259
1260         mutex_lock(&ucr->dev_mutex);
1261
1262         if (!host->ddr_mode)
1263                 err = sd_tuning_rx(host, MMC_SEND_TUNING_BLOCK);
1264
1265         mutex_unlock(&ucr->dev_mutex);
1266
1267         return err;
1268 }
1269
1270 static const struct mmc_host_ops rtsx_usb_sdmmc_ops = {
1271         .request = sdmmc_request,
1272         .set_ios = sdmmc_set_ios,
1273         .get_ro = sdmmc_get_ro,
1274         .get_cd = sdmmc_get_cd,
1275         .start_signal_voltage_switch = sdmmc_switch_voltage,
1276         .card_busy = sdmmc_card_busy,
1277         .execute_tuning = sdmmc_execute_tuning,
1278 };
1279
1280 #ifdef RTSX_USB_USE_LEDS_CLASS
1281 static void rtsx_usb_led_control(struct led_classdev *led,
1282         enum led_brightness brightness)
1283 {
1284         struct rtsx_usb_sdmmc *host = container_of(led,
1285                         struct rtsx_usb_sdmmc, led);
1286
1287         if (host->host_removal)
1288                 return;
1289
1290         host->led.brightness = brightness;
1291         schedule_work(&host->led_work);
1292 }
1293
1294 static void rtsx_usb_update_led(struct work_struct *work)
1295 {
1296         struct rtsx_usb_sdmmc *host =
1297                 container_of(work, struct rtsx_usb_sdmmc, led_work);
1298         struct rtsx_ucr *ucr = host->ucr;
1299
1300         pm_runtime_get_sync(sdmmc_dev(host));
1301         mutex_lock(&ucr->dev_mutex);
1302
1303         if (host->led.brightness == LED_OFF)
1304                 rtsx_usb_turn_off_led(ucr);
1305         else
1306                 rtsx_usb_turn_on_led(ucr);
1307
1308         mutex_unlock(&ucr->dev_mutex);
1309         pm_runtime_put(sdmmc_dev(host));
1310 }
1311 #endif
1312
1313 static void rtsx_usb_init_host(struct rtsx_usb_sdmmc *host)
1314 {
1315         struct mmc_host *mmc = host->mmc;
1316
1317         mmc->f_min = 250000;
1318         mmc->f_max = 208000000;
1319         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
1320         mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SD_HIGHSPEED |
1321                 MMC_CAP_MMC_HIGHSPEED | MMC_CAP_BUS_WIDTH_TEST |
1322                 MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | MMC_CAP_UHS_SDR50 |
1323                 MMC_CAP_NEEDS_POLL | MMC_CAP_ERASE;
1324         mmc->caps2 = MMC_CAP2_NO_PRESCAN_POWERUP | MMC_CAP2_FULL_PWR_CYCLE |
1325                 MMC_CAP2_NO_SDIO;
1326
1327         mmc->max_current_330 = 400;
1328         mmc->max_current_180 = 800;
1329         mmc->ops = &rtsx_usb_sdmmc_ops;
1330         mmc->max_segs = 256;
1331         mmc->max_seg_size = 65536;
1332         mmc->max_blk_size = 512;
1333         mmc->max_blk_count = 65535;
1334         mmc->max_req_size = 524288;
1335
1336         host->power_mode = MMC_POWER_OFF;
1337 }
1338
1339 static int rtsx_usb_sdmmc_drv_probe(struct platform_device *pdev)
1340 {
1341         struct mmc_host *mmc;
1342         struct rtsx_usb_sdmmc *host;
1343         struct rtsx_ucr *ucr;
1344 #ifdef RTSX_USB_USE_LEDS_CLASS
1345         int err;
1346 #endif
1347
1348         ucr = usb_get_intfdata(to_usb_interface(pdev->dev.parent));
1349         if (!ucr)
1350                 return -ENXIO;
1351
1352         dev_dbg(&(pdev->dev), ": Realtek USB SD/MMC controller found\n");
1353
1354         mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
1355         if (!mmc)
1356                 return -ENOMEM;
1357
1358         host = mmc_priv(mmc);
1359         host->ucr = ucr;
1360         host->mmc = mmc;
1361         host->pdev = pdev;
1362         platform_set_drvdata(pdev, host);
1363
1364         mutex_init(&host->host_mutex);
1365         rtsx_usb_init_host(host);
1366         pm_runtime_use_autosuspend(&pdev->dev);
1367         pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
1368         pm_runtime_enable(&pdev->dev);
1369
1370 #ifdef RTSX_USB_USE_LEDS_CLASS
1371         snprintf(host->led_name, sizeof(host->led_name),
1372                 "%s::", mmc_hostname(mmc));
1373         host->led.name = host->led_name;
1374         host->led.brightness = LED_OFF;
1375         host->led.default_trigger = mmc_hostname(mmc);
1376         host->led.brightness_set = rtsx_usb_led_control;
1377
1378         err = led_classdev_register(mmc_dev(mmc), &host->led);
1379         if (err)
1380                 dev_err(&(pdev->dev),
1381                                 "Failed to register LED device: %d\n", err);
1382         INIT_WORK(&host->led_work, rtsx_usb_update_led);
1383
1384 #endif
1385         mmc_add_host(mmc);
1386
1387         return 0;
1388 }
1389
1390 static int rtsx_usb_sdmmc_drv_remove(struct platform_device *pdev)
1391 {
1392         struct rtsx_usb_sdmmc *host = platform_get_drvdata(pdev);
1393         struct mmc_host *mmc;
1394
1395         if (!host)
1396                 return 0;
1397
1398         mmc = host->mmc;
1399         host->host_removal = true;
1400
1401         mutex_lock(&host->host_mutex);
1402         if (host->mrq) {
1403                 dev_dbg(&(pdev->dev),
1404                         "%s: Controller removed during transfer\n",
1405                         mmc_hostname(mmc));
1406                 host->mrq->cmd->error = -ENOMEDIUM;
1407                 if (host->mrq->stop)
1408                         host->mrq->stop->error = -ENOMEDIUM;
1409                 mmc_request_done(mmc, host->mrq);
1410         }
1411         mutex_unlock(&host->host_mutex);
1412
1413         mmc_remove_host(mmc);
1414
1415 #ifdef RTSX_USB_USE_LEDS_CLASS
1416         cancel_work_sync(&host->led_work);
1417         led_classdev_unregister(&host->led);
1418 #endif
1419
1420         mmc_free_host(mmc);
1421         pm_runtime_disable(&pdev->dev);
1422         pm_runtime_dont_use_autosuspend(&pdev->dev);
1423         platform_set_drvdata(pdev, NULL);
1424
1425         dev_dbg(&(pdev->dev),
1426                 ": Realtek USB SD/MMC module has been removed\n");
1427
1428         return 0;
1429 }
1430
1431 static const struct platform_device_id rtsx_usb_sdmmc_ids[] = {
1432         {
1433                 .name = "rtsx_usb_sdmmc",
1434         }, {
1435                 /* sentinel */
1436         }
1437 };
1438 MODULE_DEVICE_TABLE(platform, rtsx_usb_sdmmc_ids);
1439
1440 static struct platform_driver rtsx_usb_sdmmc_driver = {
1441         .probe          = rtsx_usb_sdmmc_drv_probe,
1442         .remove         = rtsx_usb_sdmmc_drv_remove,
1443         .id_table       = rtsx_usb_sdmmc_ids,
1444         .driver         = {
1445                 .name   = "rtsx_usb_sdmmc",
1446         },
1447 };
1448 module_platform_driver(rtsx_usb_sdmmc_driver);
1449
1450 MODULE_LICENSE("GPL v2");
1451 MODULE_AUTHOR("Roger Tseng <rogerable@realtek.com>");
1452 MODULE_DESCRIPTION("Realtek USB SD/MMC Card Host Driver");