Re: [PATCH v6 3/4] mmc: Add realtek USB sdmmc host driver

[Ulf Hansson]

On 9 April 2014 08:16,  <rogerable@xxxxxxxxxxx> wrote:
> From: Roger Tseng <rogerable@xxxxxxxxxxx>
>
> Realtek USB SD/MMC host driver provides mmc host support based on the Realtek
> USB card reader MFD driver.
>
> Signed-off-by: Roger Tseng <rogerable@xxxxxxxxxxx>
> ---
>  drivers/mmc/host/Kconfig          |    7 +
>  drivers/mmc/host/Makefile         |    1 +
>  drivers/mmc/host/rtsx_usb_sdmmc.c | 1462 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 1470 insertions(+)
>  create mode 100644 drivers/mmc/host/rtsx_usb_sdmmc.c
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 1384f67..1c01df4 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -689,3 +689,10 @@ config MMC_REALTEK_PCI
>         help
>           Say Y here to include driver code to support SD/MMC card interface
>           of Realtek PCI-E card reader
> +
> +config MMC_REALTEK_USB
> +       tristate "Realtek USB SD/MMC Card Interface Driver"
> +       depends on MFD_RTSX_USB
> +       help
> +         Say Y here to include driver code to support SD/MMC card interface
> +         of Realtek RTS5129/39 series card reader
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 3483b6b..8194317 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -53,6 +53,7 @@ obj-$(CONFIG_MMC_USHC)                += ushc.o
>  obj-$(CONFIG_MMC_WMT)          += wmt-sdmmc.o
>
>  obj-$(CONFIG_MMC_REALTEK_PCI)  += rtsx_pci_sdmmc.o
> +obj-$(CONFIG_MMC_REALTEK_USB)  += rtsx_usb_sdmmc.o
>
>  obj-$(CONFIG_MMC_SDHCI_PLTFM)          += sdhci-pltfm.o
>  obj-$(CONFIG_MMC_SDHCI_CNS3XXX)                += sdhci-cns3xxx.o
> diff --git a/drivers/mmc/host/rtsx_usb_sdmmc.c b/drivers/mmc/host/rtsx_usb_sdmmc.c
> new file mode 100644
> index 0000000..37f58b5
> --- /dev/null
> +++ b/drivers/mmc/host/rtsx_usb_sdmmc.c
> @@ -0,0 +1,1462 @@
> +/* Realtek USB SD/MMC Card Interface driver
> + *
> + * Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, see <http://www.gnu.org/licenses/>.
> + *
> + * Author:
> + *   Roger Tseng <rogerable@xxxxxxxxxxx>
> + */
> +
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +#include <linux/platform_device.h>
> +#include <linux/usb.h>
> +#include <linux/mmc/host.h>
> +#include <linux/mmc/mmc.h>
> +#include <linux/mmc/sd.h>
> +#include <linux/mmc/sdio.h>
> +#include <linux/mmc/card.h>
> +#include <linux/scatterlist.h>
> +#include <linux/pm_runtime.h>
> +
> +#include <linux/mfd/rtsx_usb.h>
> +#include <asm/unaligned.h>
> +
> +#if defined(CONFIG_LEDS_CLASS) || defined(CONFIG_LEDS_CLASS_MODULE)
> +#include <linux/leds.h>
> +#include <linux/workqueue.h>
> +#define RTSX_USB_USE_LEDS_CLASS
> +#endif
> +
> +struct rtsx_usb_sdmmc {
> +       struct platform_device  *pdev;
> +       struct rtsx_ucr *ucr;
> +       struct mmc_host         *mmc;
> +       struct mmc_request      *mrq;
> +
> +       struct mutex            host_mutex;
> +
> +       u8                      ssc_depth;
> +       unsigned int            clock;
> +       bool                    vpclk;
> +       bool                    double_clk;
> +       bool                    host_removal;
> +       bool                    card_exist;
> +       bool                    initial_mode;
> +       bool                    ddr_mode;
> +
> +       unsigned char           power_mode;
> +
> +#if defined(CONFIG_LEDS_CLASS) || defined(CONFIG_LEDS_CLASS_MODULE)
> +       struct led_classdev     led;
> +       char                    led_name[32];
> +       struct work_struct      led_work;
> +#endif
> +};
> +
> +static inline struct device *sdmmc_dev(struct rtsx_usb_sdmmc *host)
> +{
> +       return &(host->pdev->dev);
> +}
> +
> +static inline void sd_clear_error(struct rtsx_usb_sdmmc *host)
> +{
> +       struct rtsx_ucr *ucr = host->ucr;
> +       rtsx_usb_ep0_write_register(ucr, CARD_STOP,
> +                                 SD_STOP | SD_CLR_ERR,
> +                                 SD_STOP | SD_CLR_ERR);
> +
> +       rtsx_usb_clear_dma_err(ucr);
> +       rtsx_usb_clear_fsm_err(ucr);
> +}
> +
> +#ifdef DEBUG
> +static void sd_print_debug_regs(struct rtsx_usb_sdmmc *host)
> +{
> +       struct rtsx_ucr *ucr = host->ucr;
> +       u8 val = 0;
> +
> +       rtsx_usb_ep0_read_register(ucr, SD_STAT1, &val);
> +       dev_dbg(sdmmc_dev(host), "SD_STAT1: 0x%x\n", val);
> +       rtsx_usb_ep0_read_register(ucr, SD_STAT2, &val);
> +       dev_dbg(sdmmc_dev(host), "SD_STAT2: 0x%x\n", val);
> +       rtsx_usb_ep0_read_register(ucr, SD_BUS_STAT, &val);
> +       dev_dbg(sdmmc_dev(host), "SD_BUS_STAT: 0x%x\n", val);
> +}
> +#else
> +#define sd_print_debug_regs(host)
> +#endif /* DEBUG */
> +
> +static int sd_read_data(struct rtsx_usb_sdmmc *host, struct mmc_command *cmd,
> +              u16 byte_cnt, u8 *buf, int buf_len, int timeout)
> +{
> +       struct rtsx_ucr *ucr = host->ucr;
> +       int err;
> +       u8 trans_mode;
> +
> +       if (!buf)
> +               buf_len = 0;
> +
> +       rtsx_usb_init_cmd(ucr);
> +       if (cmd != NULL) {
> +               dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD%d\n", __func__
> +                               , cmd->opcode);
> +               if (cmd->opcode == MMC_SEND_TUNING_BLOCK)
> +                       trans_mode = SD_TM_AUTO_TUNING;
> +               else
> +                       trans_mode = SD_TM_NORMAL_READ;
> +
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                               SD_CMD0, 0xFF, (u8)(cmd->opcode) | 0x40);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                               SD_CMD1, 0xFF, (u8)(cmd->arg >> 24));
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                               SD_CMD2, 0xFF, (u8)(cmd->arg >> 16));
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                               SD_CMD3, 0xFF, (u8)(cmd->arg >> 8));
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                               SD_CMD4, 0xFF, (u8)cmd->arg);
> +       } else {
> +               trans_mode = SD_TM_AUTO_READ_3;
> +       }
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, (u8)byte_cnt);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_H,
> +                       0xFF, (u8)(byte_cnt >> 8));
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_L, 0xFF, 1);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_H, 0xFF, 0);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF,
> +                       SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
> +                       SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_6);
> +       if (trans_mode != SD_TM_AUTO_TUNING)
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                               CARD_DATA_SOURCE, 0x01, PINGPONG_BUFFER);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER,
> +                       0xFF, trans_mode | SD_TRANSFER_START);
> +       rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
> +                       SD_TRANSFER_END, SD_TRANSFER_END);
> +
> +       if (cmd != NULL) {
> +               rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD1, 0, 0);
> +               rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD2, 0, 0);
> +               rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD3, 0, 0);
> +               rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD4, 0, 0);
> +       }
> +
> +       err = rtsx_usb_send_cmd(ucr, MODE_CR, timeout);
> +       if (err) {
> +               dev_dbg(sdmmc_dev(host),
> +                       "rtsx_usb_send_cmd failed (err = %d)\n", err);
> +               return err;
> +       }
> +
> +       err = rtsx_usb_get_rsp(ucr, !cmd ? 1 : 5, timeout);
> +       if (err || (ucr->rsp_buf[0] & SD_TRANSFER_ERR)) {
> +               sd_print_debug_regs(host);
> +
> +               if (!err) {
> +                       dev_dbg(sdmmc_dev(host),
> +                               "Transfer failed (SD_TRANSFER = %02x)\n",
> +                               ucr->rsp_buf[0]);
> +                       err = -EIO;
> +               } else {
> +                       dev_dbg(sdmmc_dev(host),
> +                               "rtsx_usb_get_rsp failed (err = %d)\n", err);
> +               }
> +
> +               return err;
> +       }
> +
> +       if (cmd != NULL) {
> +               cmd->resp[0] = get_unaligned_be32(ucr->rsp_buf + 1);
> +               dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
> +                               cmd->resp[0]);
> +       }
> +
> +       if (buf && buf_len) {
> +               /* 2-byte aligned part */
> +               err = rtsx_usb_read_ppbuf(ucr, buf, byte_cnt - (byte_cnt % 2));
> +               if (err) {
> +                       dev_dbg(sdmmc_dev(host),
> +                               "rtsx_usb_read_ppbuf failed (err = %d)\n", err);
> +                       return err;
> +               }
> +
> +               /* unaligned byte */
> +               if (byte_cnt % 2)
> +                       return rtsx_usb_read_register(ucr,
> +                                       PPBUF_BASE2 + byte_cnt,
> +                                       buf + byte_cnt - 1);
> +       }
> +
> +       return 0;
> +}
> +
> +static int sd_write_data(struct rtsx_usb_sdmmc *host, struct mmc_command *cmd,
> +               u16 byte_cnt, u8 *buf, int buf_len, int timeout)
> +{
> +       struct rtsx_ucr *ucr = host->ucr;
> +       int err;
> +       u8 trans_mode;
> +
> +       if (!buf)
> +               buf_len = 0;
> +
> +       if (buf && buf_len) {
> +               err = rtsx_usb_write_ppbuf(ucr, buf, buf_len);
> +               if (err) {
> +                       dev_dbg(sdmmc_dev(host),
> +                               "rtsx_usb_write_ppbuf failed (err = %d)\n",
> +                               err);
> +                       return err;
> +               }
> +       }
> +
> +       trans_mode = (cmd != NULL) ? SD_TM_AUTO_WRITE_2 : SD_TM_AUTO_WRITE_3;
> +       rtsx_usb_init_cmd(ucr);
> +
> +       if (cmd != NULL) {
> +               dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD%d\n", __func__,
> +                               cmd->opcode);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                               SD_CMD0, 0xFF, (u8)(cmd->opcode) | 0x40);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                               SD_CMD1, 0xFF, (u8)(cmd->arg >> 24));
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                               SD_CMD2, 0xFF, (u8)(cmd->arg >> 16));
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                               SD_CMD3, 0xFF, (u8)(cmd->arg >> 8));
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                               SD_CMD4, 0xFF, (u8)cmd->arg);
> +       }
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, (u8)byte_cnt);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_H,
> +                       0xFF, (u8)(byte_cnt >> 8));
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_L, 0xFF, 1);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_H, 0xFF, 0);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF,
> +               SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
> +               SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_6);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                       CARD_DATA_SOURCE, 0x01, PINGPONG_BUFFER);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
> +                       trans_mode | SD_TRANSFER_START);
> +       rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
> +                       SD_TRANSFER_END, SD_TRANSFER_END);
> +
> +       if (cmd != NULL) {
> +               rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD1, 0, 0);
> +               rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD2, 0, 0);
> +               rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD3, 0, 0);
> +               rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_CMD4, 0, 0);
> +       }
> +
> +       err = rtsx_usb_send_cmd(ucr, MODE_CR, timeout);
> +       if (err) {
> +               dev_dbg(sdmmc_dev(host),
> +                       "rtsx_usb_send_cmd failed (err = %d)\n", err);
> +               return err;
> +       }
> +
> +       err = rtsx_usb_get_rsp(ucr, !cmd ? 1 : 5, timeout);
> +       if (err) {
> +               sd_print_debug_regs(host);
> +               dev_dbg(sdmmc_dev(host),
> +                       "rtsx_usb_get_rsp failed (err = %d)\n", err);
> +               return err;
> +       }
> +
> +       if (cmd != NULL) {
> +               cmd->resp[0] = get_unaligned_be32(ucr->rsp_buf + 1);
> +               dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
> +                               cmd->resp[0]);
> +       }
> +
> +       return 0;
> +}
> +
> +static void sd_send_cmd_get_rsp(struct rtsx_usb_sdmmc *host,
> +               struct mmc_command *cmd)
> +{
> +       struct rtsx_ucr *ucr = host->ucr;
> +       u8 cmd_idx = (u8)cmd->opcode;
> +       u32 arg = cmd->arg;
> +       int err = 0;
> +       int timeout = 100;
> +       int i;
> +       u8 *ptr;
> +       int stat_idx = 0;
> +       int len = 2;
> +       u8 rsp_type;
> +
> +       dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
> +                       __func__, cmd_idx, arg);
> +
> +       /* Response type:
> +        * R0
> +        * R1, R5, R6, R7
> +        * R1b
> +        * R2
> +        * R3, R4
> +        */
> +       switch (mmc_resp_type(cmd)) {
> +       case MMC_RSP_NONE:
> +               rsp_type = SD_RSP_TYPE_R0;
> +               break;
> +       case MMC_RSP_R1:
> +               rsp_type = SD_RSP_TYPE_R1;
> +               break;
> +       case MMC_RSP_R1 & ~MMC_RSP_CRC:
> +               rsp_type = SD_RSP_TYPE_R1 | SD_NO_CHECK_CRC7;
> +               break;
> +       case MMC_RSP_R1B:
> +               rsp_type = SD_RSP_TYPE_R1b;
> +               break;
> +       case MMC_RSP_R2:
> +               rsp_type = SD_RSP_TYPE_R2;
> +               break;
> +       case MMC_RSP_R3:
> +               rsp_type = SD_RSP_TYPE_R3;
> +               break;
> +       default:
> +               dev_dbg(sdmmc_dev(host), "cmd->flag is not valid\n");
> +               err = -EINVAL;
> +               goto out;
> +       }
> +
> +       if (rsp_type == SD_RSP_TYPE_R1b)
> +               timeout = 3000;
> +
> +       if (cmd->opcode == SD_SWITCH_VOLTAGE) {
> +               err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
> +                               SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
> +                               SD_CLK_TOGGLE_EN);
> +               if (err)
> +                       goto out;
> +       }
> +
> +       rtsx_usb_init_cmd(ucr);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD0, 0xFF, 0x40 | cmd_idx);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD1, 0xFF, (u8)(arg >> 24));
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD2, 0xFF, (u8)(arg >> 16));
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD3, 0xFF, (u8)(arg >> 8));
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CMD4, 0xFF, (u8)arg);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF, rsp_type);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DATA_SOURCE,
> +                       0x01, PINGPONG_BUFFER);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER,
> +                       0xFF, SD_TM_CMD_RSP | SD_TRANSFER_START);
> +       rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
> +                    SD_TRANSFER_END | SD_STAT_IDLE,
> +                    SD_TRANSFER_END | SD_STAT_IDLE);
> +
> +       if (rsp_type == SD_RSP_TYPE_R2) {
> +               /* Read data from ping-pong buffer */
> +               for (i = PPBUF_BASE2; i < PPBUF_BASE2 + 16; i++)
> +                       rtsx_usb_add_cmd(ucr, READ_REG_CMD, (u16)i, 0, 0);
> +               stat_idx = 16;
> +       } else if (rsp_type != SD_RSP_TYPE_R0) {
> +               /* Read data from SD_CMDx registers */
> +               for (i = SD_CMD0; i <= SD_CMD4; i++)
> +                       rtsx_usb_add_cmd(ucr, READ_REG_CMD, (u16)i, 0, 0);
> +               stat_idx = 5;
> +       }
> +       len += stat_idx;
> +
> +       rtsx_usb_add_cmd(ucr, READ_REG_CMD, SD_STAT1, 0, 0);
> +
> +       err = rtsx_usb_send_cmd(ucr, MODE_CR, 100);
> +       if (err) {
> +               dev_dbg(sdmmc_dev(host),
> +                       "rtsx_usb_send_cmd error (err = %d)\n", err);
> +               goto out;
> +       }
> +
> +       err = rtsx_usb_get_rsp(ucr, len, timeout);
> +       if (err || (ucr->rsp_buf[0] & SD_TRANSFER_ERR)) {
> +               sd_print_debug_regs(host);
> +               sd_clear_error(host);
> +
> +               if (!err) {
> +                       dev_dbg(sdmmc_dev(host),
> +                               "Transfer failed (SD_TRANSFER = %02x)\n",
> +                                       ucr->rsp_buf[0]);
> +                       err = -EIO;
> +               } else {
> +                       dev_dbg(sdmmc_dev(host),
> +                               "rtsx_usb_get_rsp failed (err = %d)\n", err);
> +               }
> +
> +               goto out;
> +       }
> +
> +       if (rsp_type == SD_RSP_TYPE_R0) {
> +               err = 0;
> +               goto out;
> +       }
> +
> +       /* Skip result of CHECK_REG_CMD */
> +       ptr = ucr->rsp_buf + 1;
> +
> +       /* Check (Start,Transmission) bit of Response */
> +       if ((ptr[0] & 0xC0) != 0) {
> +               err = -EILSEQ;
> +               dev_dbg(sdmmc_dev(host), "Invalid response bit\n");
> +               goto out;
> +       }
> +
> +       /* Check CRC7 */
> +       if (!(rsp_type & SD_NO_CHECK_CRC7)) {
> +               if (ptr[stat_idx] & SD_CRC7_ERR) {
> +                       err = -EILSEQ;
> +                       dev_dbg(sdmmc_dev(host), "CRC7 error\n");
> +                       goto out;
> +               }
> +       }
> +
> +       if (rsp_type == SD_RSP_TYPE_R2) {
> +               for (i = 0; i < 4; i++) {
> +                       cmd->resp[i] = get_unaligned_be32(ptr + 1 + i * 4);
> +                       dev_dbg(sdmmc_dev(host), "cmd->resp[%d] = 0x%08x\n",
> +                                       i, cmd->resp[i]);
> +               }
> +       } else {
> +               cmd->resp[0] = get_unaligned_be32(ptr + 1);
> +               dev_dbg(sdmmc_dev(host), "cmd->resp[0] = 0x%08x\n",
> +                               cmd->resp[0]);
> +       }
> +
> +out:
> +       cmd->error = err;
> +}
> +
> +static int sd_rw_multi(struct rtsx_usb_sdmmc *host, struct mmc_request *mrq)
> +{
> +       struct rtsx_ucr *ucr = host->ucr;
> +       struct mmc_data *data = mrq->data;
> +       int read = (data->flags & MMC_DATA_READ) ? 1 : 0;
> +       u8 cfg2, trans_mode;
> +       int err;
> +       u8 flag;
> +       size_t data_len = data->blksz * data->blocks;
> +       unsigned int pipe;
> +
> +       if (read) {
> +               dev_dbg(sdmmc_dev(host), "%s: read %zu bytes\n",
> +                               __func__, data_len);
> +               cfg2 = SD_CALCULATE_CRC7 | SD_CHECK_CRC16 |
> +                       SD_NO_WAIT_BUSY_END | SD_CHECK_CRC7 | SD_RSP_LEN_0;
> +               trans_mode = SD_TM_AUTO_READ_3;
> +       } else {
> +               dev_dbg(sdmmc_dev(host), "%s: write %zu bytes\n",
> +                               __func__, data_len);
> +               cfg2 = SD_NO_CALCULATE_CRC7 | SD_CHECK_CRC16 |
> +                       SD_NO_WAIT_BUSY_END | SD_NO_CHECK_CRC7 | SD_RSP_LEN_0;
> +               trans_mode = SD_TM_AUTO_WRITE_3;
> +       }
> +
> +       rtsx_usb_init_cmd(ucr);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_L, 0xFF, 0x00);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BYTE_CNT_H, 0xFF, 0x02);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_L,
> +                       0xFF, (u8)data->blocks);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BLOCK_CNT_H,
> +                       0xFF, (u8)(data->blocks >> 8));
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_DATA_SOURCE,
> +                       0x01, RING_BUFFER);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC3,
> +                       0xFF, (u8)(data_len >> 24));
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC2,
> +                       0xFF, (u8)(data_len >> 16));
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC1,
> +                       0xFF, (u8)(data_len >> 8));
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_TC0,
> +                       0xFF, (u8)data_len);
> +       if (read) {
> +               flag = MODE_CDIR;
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_CTL,
> +                               0x03 | DMA_PACK_SIZE_MASK,
> +                               DMA_DIR_FROM_CARD | DMA_EN | DMA_512);
> +       } else {
> +               flag = MODE_CDOR;
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, MC_DMA_CTL,
> +                               0x03 | DMA_PACK_SIZE_MASK,
> +                               DMA_DIR_TO_CARD | DMA_EN | DMA_512);
> +       }
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG2, 0xFF, cfg2);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_TRANSFER, 0xFF,
> +                       trans_mode | SD_TRANSFER_START);
> +       rtsx_usb_add_cmd(ucr, CHECK_REG_CMD, SD_TRANSFER,
> +                       SD_TRANSFER_END, SD_TRANSFER_END);
> +
> +       err = rtsx_usb_send_cmd(ucr, flag, 100);
> +       if (err)
> +               return err;
> +
> +       if (read)
> +               pipe = usb_rcvbulkpipe(ucr->pusb_dev, EP_BULK_IN);
> +       else
> +               pipe = usb_sndbulkpipe(ucr->pusb_dev, EP_BULK_OUT);
> +
> +       err = rtsx_usb_transfer_data(ucr, pipe, data->sg, data_len,
> +                       data->sg_len,  NULL, 10000);
> +       if (err) {
> +               dev_dbg(sdmmc_dev(host), "rtsx_usb_transfer_data error %d\n"
> +                               , err);
> +               sd_clear_error(host);
> +               return err;
> +       }
> +
> +       return rtsx_usb_get_rsp(ucr, 1, 2000);
> +}
> +
> +static inline void sd_enable_initial_mode(struct rtsx_usb_sdmmc *host)
> +{
> +       rtsx_usb_write_register(host->ucr, SD_CFG1,
> +                       SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_128);
> +}
> +
> +static inline void sd_disable_initial_mode(struct rtsx_usb_sdmmc *host)
> +{
> +       rtsx_usb_write_register(host->ucr, SD_CFG1,
> +                       SD_CLK_DIVIDE_MASK, SD_CLK_DIVIDE_0);
> +}
> +
> +static void sd_normal_rw(struct rtsx_usb_sdmmc *host,
> +               struct mmc_request *mrq)
> +{
> +       struct mmc_command *cmd = mrq->cmd;
> +       struct mmc_data *data = mrq->data;
> +       u8 *buf;
> +
> +       buf = kzalloc(data->blksz, GFP_NOIO);
> +       if (!buf) {
> +               cmd->error = -ENOMEM;
> +               return;
> +       }
> +
> +       if (data->flags & MMC_DATA_READ) {
> +               if (host->initial_mode)
> +                       sd_disable_initial_mode(host);
> +
> +               cmd->error = sd_read_data(host, cmd, (u16)data->blksz, buf,
> +                               data->blksz, 200);
> +
> +               if (host->initial_mode)
> +                       sd_enable_initial_mode(host);
> +
> +               sg_copy_from_buffer(data->sg, data->sg_len, buf, data->blksz);
> +       } else {
> +               sg_copy_to_buffer(data->sg, data->sg_len, buf, data->blksz);
> +
> +               cmd->error = sd_write_data(host, cmd, (u16)data->blksz, buf,
> +                               data->blksz, 200);
> +       }
> +
> +       kfree(buf);
> +}
> +
> +static int sd_change_phase(struct rtsx_usb_sdmmc *host, u8 sample_point, int tx)
> +{
> +       struct rtsx_ucr *ucr = host->ucr;
> +       int err;
> +
> +       dev_dbg(sdmmc_dev(host), "%s: %s sample_point = %d\n",
> +                       __func__, tx ? "TX" : "RX", sample_point);
> +
> +       rtsx_usb_init_cmd(ucr);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV, CLK_CHANGE, CLK_CHANGE);
> +
> +       if (tx)
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
> +                               0x0F, sample_point);
> +       else
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK1_CTL,
> +                               0x0F, sample_point);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL, PHASE_NOT_RESET, 0);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_VPCLK0_CTL,
> +                       PHASE_NOT_RESET, PHASE_NOT_RESET);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV, CLK_CHANGE, 0);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1, SD_ASYNC_FIFO_RST, 0);
> +
> +       err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
> +       if (err)
> +               return err;
> +
> +       return 0;
> +}
> +
> +static inline u32 get_phase_point(u32 phase_map, unsigned int idx)
> +{
> +       idx &= MAX_PHASE;
> +       return phase_map & (1 << idx);
> +}
> +
> +static int get_phase_len(u32 phase_map, unsigned int idx)
> +{
> +       int i;
> +
> +       for (i = 0; i < MAX_PHASE + 1; i++) {
> +               if (get_phase_point(phase_map, idx + i) == 0)
> +                       return i;
> +       }
> +       return MAX_PHASE + 1;
> +}
> +
> +static u8 sd_search_final_phase(struct rtsx_usb_sdmmc *host, u32 phase_map)
> +{
> +       int start = 0, len = 0;
> +       int start_final = 0, len_final = 0;
> +       u8 final_phase = 0xFF;
> +
> +       if (phase_map == 0) {
> +               dev_dbg(sdmmc_dev(host), "Phase: [map:%x]\n", phase_map);
> +               return final_phase;
> +       }
> +
> +       while (start < MAX_PHASE + 1) {
> +               len = get_phase_len(phase_map, start);
> +               if (len_final < len) {
> +                       start_final = start;
> +                       len_final = len;
> +               }
> +               start += len ? len : 1;
> +       }
> +
> +       final_phase = (start_final + len_final / 2) & MAX_PHASE;
> +       dev_dbg(sdmmc_dev(host), "Phase: [map:%x] [maxlen:%d] [final:%d]\n",
> +               phase_map, len_final, final_phase);
> +
> +       return final_phase;
> +}
> +
> +static void sd_wait_data_idle(struct rtsx_usb_sdmmc *host)
> +{
> +       int err, i;
> +       u8 val = 0;
> +
> +       for (i = 0; i < 100; i++) {
> +               err = rtsx_usb_ep0_read_register(host->ucr,
> +                               SD_DATA_STATE, &val);
> +               if (val & SD_DATA_IDLE)
> +                       return;
> +
> +               usleep_range(100, 1000);
> +       }
> +}
> +
> +static int sd_tuning_rx_cmd(struct rtsx_usb_sdmmc *host,
> +               u8 opcode, u8 sample_point)
> +{
> +       int err;
> +       struct mmc_command cmd = {0};
> +
> +       err = sd_change_phase(host, sample_point, 0);
> +       if (err)
> +               return err;
> +
> +       cmd.opcode = MMC_SEND_TUNING_BLOCK;
> +       err = sd_read_data(host, &cmd, 0x40, NULL, 0, 100);
> +       if (err) {
> +               /* Wait till SD DATA IDLE */
> +               sd_wait_data_idle(host);
> +               sd_clear_error(host);
> +               return err;
> +       }
> +
> +       return 0;
> +}
> +
> +static void sd_tuning_phase(struct rtsx_usb_sdmmc *host,
> +               u8 opcode, u16 *phase_map)
> +{
> +       int err, i;
> +       u16 raw_phase_map = 0;
> +
> +       for (i = MAX_PHASE; i >= 0; i--) {
> +               err = sd_tuning_rx_cmd(host, opcode, (u8)i);
> +               if (!err)
> +                       raw_phase_map |= 1 << i;
> +       }
> +
> +       if (phase_map)
> +               *phase_map = raw_phase_map;
> +}
> +
> +static int sd_tuning_rx(struct rtsx_usb_sdmmc *host, u8 opcode)
> +{
> +       int err, i;
> +       u16 raw_phase_map[RX_TUNING_CNT] = {0}, phase_map;
> +       u8 final_phase;
> +
> +       /* setting fixed default TX phase */
> +       err = sd_change_phase(host, 0x01, 1);
> +       if (err) {
> +               dev_dbg(sdmmc_dev(host), "TX phase setting failed\n");
> +               return err;
> +       }
> +
> +       /* tuning RX phase */
> +       for (i = 0; i < RX_TUNING_CNT; i++) {
> +               sd_tuning_phase(host, opcode, &(raw_phase_map[i]));
> +
> +               if (raw_phase_map[i] == 0)
> +                       break;
> +       }
> +
> +       phase_map = 0xFFFF;
> +       for (i = 0; i < RX_TUNING_CNT; i++) {
> +               dev_dbg(sdmmc_dev(host), "RX raw_phase_map[%d] = 0x%04x\n",
> +                               i, raw_phase_map[i]);
> +               phase_map &= raw_phase_map[i];
> +       }
> +       dev_dbg(sdmmc_dev(host), "RX phase_map = 0x%04x\n", phase_map);
> +
> +       if (phase_map) {
> +               final_phase = sd_search_final_phase(host, phase_map);
> +               if (final_phase == 0xFF)
> +                       return -EINVAL;
> +
> +               err = sd_change_phase(host, final_phase, 0);
> +               if (err)
> +                       return err;
> +       } else {
> +               return -EINVAL;
> +       }
> +
> +       return 0;
> +}
> +
> +static int sdmmc_get_ro(struct mmc_host *mmc)
> +{
> +       struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
> +       struct rtsx_ucr *ucr = host->ucr;
> +       int err;
> +       u16 val;
> +
> +       if (host->host_removal)
> +               return -ENOMEDIUM;
> +
> +       mutex_lock(&ucr->dev_mutex);
> +
> +       /* Check SD card detect */
> +       err = rtsx_usb_get_card_status(ucr, &val);
> +
> +       mutex_unlock(&ucr->dev_mutex);
> +
> +
> +       /* Treat failed detection as non-ro */
> +       if (err)
> +               return 0;
> +
> +       if (val & SD_WP)
> +               return 1;
> +
> +       return 0;
> +}
> +
> +static int sdmmc_get_cd(struct mmc_host *mmc)
> +{
> +       struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
> +       struct rtsx_ucr *ucr = host->ucr;
> +       int err;
> +       u16 val;
> +
> +       if (host->host_removal)
> +               return -ENOMEDIUM;
> +
> +       mutex_lock(&ucr->dev_mutex);
> +
> +       /* Check SD card detect */
> +       err = rtsx_usb_get_card_status(ucr, &val);
> +
> +       mutex_unlock(&ucr->dev_mutex);
> +
> +       /* Treat failed detection as non-exist */
> +       if (err)
> +               goto no_card;
> +
> +       if (val & SD_CD) {
> +               host->card_exist = true;
> +               return 1;
> +       }
> +
> +no_card:
> +       host->card_exist = false;
> +       return 0;
> +}
> +
> +static void sdmmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
> +{
> +       struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
> +       struct rtsx_ucr *ucr = host->ucr;
> +       struct mmc_command *cmd = mrq->cmd;
> +       struct mmc_data *data = mrq->data;
> +       unsigned int data_size = 0;
> +
> +       dev_dbg(sdmmc_dev(host), "%s\n", __func__);
> +
> +       if (host->host_removal) {
> +               cmd->error = -ENOMEDIUM;
> +               goto finish;
> +       }
> +
> +       if ((!host->card_exist)) {
> +               cmd->error = -ENOMEDIUM;
> +               goto finish_detect_card;
> +       }
> +
> +       /*
> +        * Reject SDIO CMDs to speed up card identification
> +        * since unsupported
> +        */
> +       if (cmd->opcode == SD_IO_SEND_OP_COND ||
> +           cmd->opcode == SD_IO_RW_DIRECT ||
> +           cmd->opcode == SD_IO_RW_EXTENDED) {
> +               cmd->error = -EINVAL;
> +               goto finish;
> +       }
> +
> +       mutex_lock(&ucr->dev_mutex);
> +
> +       mutex_lock(&host->host_mutex);
> +       host->mrq = mrq;
> +       mutex_unlock(&host->host_mutex);
> +
> +       if (mrq->data)
> +               data_size = data->blocks * data->blksz;
> +
> +       if (!data_size) {
> +               sd_send_cmd_get_rsp(host, cmd);
> +       } else if ((!(data_size % 512) && cmd->opcode != MMC_SEND_EXT_CSD) ||
> +                  mmc_op_multi(cmd->opcode)) {
> +               sd_send_cmd_get_rsp(host, cmd);
> +
> +               if (!cmd->error) {
> +                       sd_rw_multi(host, mrq);
> +
> +                       if (mmc_op_multi(cmd->opcode) && mrq->stop) {
> +                               sd_send_cmd_get_rsp(host, mrq->stop);
> +                               rtsx_usb_write_register(ucr, MC_FIFO_CTL,
> +                                               FIFO_FLUSH, FIFO_FLUSH);
> +                       }
> +               }
> +       } else {
> +               sd_normal_rw(host, mrq);
> +       }
> +
> +       if (mrq->data) {
> +               if (cmd->error || data->error)
> +                       data->bytes_xfered = 0;
> +               else
> +                       data->bytes_xfered = data->blocks * data->blksz;
> +       }
> +
> +       mutex_unlock(&ucr->dev_mutex);
> +
> +finish_detect_card:
> +       if (cmd->error) {
> +               /*
> +                * detect card when fail to update card existence state and
> +                * speed up card removal when retry
> +                */
> +               sdmmc_get_cd(mmc);
> +               dev_dbg(sdmmc_dev(host), "cmd->error = %d\n", cmd->error);
> +       }
> +
> +finish:
> +       mutex_lock(&host->host_mutex);
> +       host->mrq = NULL;
> +       mutex_unlock(&host->host_mutex);
> +
> +       mmc_request_done(mmc, mrq);
> +}
> +
> +static int sd_set_bus_width(struct rtsx_usb_sdmmc *host,
> +               unsigned char bus_width)
> +{
> +       int err = 0;
> +       u8 width[] = {
> +               [MMC_BUS_WIDTH_1] = SD_BUS_WIDTH_1BIT,
> +               [MMC_BUS_WIDTH_4] = SD_BUS_WIDTH_4BIT,
> +               [MMC_BUS_WIDTH_8] = SD_BUS_WIDTH_8BIT,
> +       };
> +
> +       if (bus_width <= MMC_BUS_WIDTH_8)
> +               err = rtsx_usb_write_register(host->ucr, SD_CFG1,
> +                               0x03, width[bus_width]);
> +
> +       return err;
> +}
> +
> +static int sd_pull_ctl_disable_lqfp48(struct rtsx_ucr *ucr)
> +{
> +       rtsx_usb_init_cmd(ucr);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0x55);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x55);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0xA5);
> +
> +       return rtsx_usb_send_cmd(ucr, MODE_C, 100);
> +}
> +
> +static int sd_pull_ctl_disable_qfn24(struct rtsx_ucr *ucr)
> +{
> +       rtsx_usb_init_cmd(ucr);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0x65);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x55);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0x95);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x56);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0x59);
> +
> +       return rtsx_usb_send_cmd(ucr, MODE_C, 100);
> +}
> +
> +static int sd_pull_ctl_enable_lqfp48(struct rtsx_ucr *ucr)
> +{
> +       rtsx_usb_init_cmd(ucr);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0xAA);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0xAA);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0xA9);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x55);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x55);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0xA5);
> +
> +       return rtsx_usb_send_cmd(ucr, MODE_C, 100);
> +}
> +
> +static int sd_pull_ctl_enable_qfn24(struct rtsx_ucr *ucr)
> +{
> +       rtsx_usb_init_cmd(ucr);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL1, 0xFF, 0xA5);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL2, 0xFF, 0x9A);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL3, 0xFF, 0xA5);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL4, 0xFF, 0x9A);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL5, 0xFF, 0x65);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PULL_CTL6, 0xFF, 0x5A);
> +
> +       return rtsx_usb_send_cmd(ucr, MODE_C, 100);
> +}
> +
> +static int sd_power_on(struct rtsx_usb_sdmmc *host)
> +{
> +       struct rtsx_ucr *ucr = host->ucr;
> +       int err;
> +
> +       dev_dbg(sdmmc_dev(host), "%s\n", __func__);
> +       rtsx_usb_init_cmd(ucr);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_SELECT, 0x07, SD_MOD_SEL);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_SHARE_MODE,
> +                       CARD_SHARE_MASK, CARD_SHARE_SD);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_EN,
> +                       SD_CLK_EN, SD_CLK_EN);
> +       err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
> +       if (err)
> +               return err;
> +
> +       if (CHECK_PKG(ucr, LQFP48))
> +               err = sd_pull_ctl_enable_lqfp48(ucr);
> +       else
> +               err = sd_pull_ctl_enable_qfn24(ucr);
> +       if (err)
> +               return err;
> +
> +       err = rtsx_usb_write_register(ucr, CARD_PWR_CTL,
> +                       POWER_MASK, PARTIAL_POWER_ON);
> +       if (err)
> +               return err;
> +
> +       usleep_range(800, 1000);
> +
> +       rtsx_usb_init_cmd(ucr);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
> +                       POWER_MASK|LDO3318_PWR_MASK, POWER_ON|LDO_ON);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_OE,
> +                       SD_OUTPUT_EN, SD_OUTPUT_EN);
> +
> +       return rtsx_usb_send_cmd(ucr, MODE_C, 100);
> +}
> +
> +static int sd_power_off(struct rtsx_usb_sdmmc *host)
> +{
> +       struct rtsx_ucr *ucr = host->ucr;
> +       int err;
> +
> +       dev_dbg(sdmmc_dev(host), "%s\n", __func__);
> +       rtsx_usb_init_cmd(ucr);
> +
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_EN, SD_CLK_EN, 0);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_OE, SD_OUTPUT_EN, 0);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
> +                       POWER_MASK, POWER_OFF);
> +       rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_PWR_CTL,
> +                       POWER_MASK|LDO3318_PWR_MASK, POWER_OFF|LDO_SUSPEND);
> +
> +       err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
> +       if (err)
> +               return err;
> +
> +       if (CHECK_PKG(ucr, LQFP48))
> +                       return sd_pull_ctl_disable_lqfp48(ucr);
> +       return sd_pull_ctl_disable_qfn24(ucr);
> +}
> +
> +static int sd_set_power_mode(struct rtsx_usb_sdmmc *host,
> +               unsigned char power_mode)
> +{
> +       int err;
> +
> +       if (power_mode != MMC_POWER_OFF)
> +               power_mode = MMC_POWER_ON;
> +
> +       if (power_mode == host->power_mode)
> +               return 0;
> +
> +       if (power_mode == MMC_POWER_OFF) {
> +               err = sd_power_off(host);
> +               pm_runtime_put(sdmmc_dev(host));
> +       } else {
> +               pm_runtime_get_sync(sdmmc_dev(host));
> +               err = sd_power_on(host);
> +       }
> +
> +       if (!err)
> +               host->power_mode = power_mode;
> +
> +       return err;
> +}
> +
> +static int sd_set_timing(struct rtsx_usb_sdmmc *host,
> +               unsigned char timing, bool *ddr_mode)
> +{
> +       struct rtsx_ucr *ucr = host->ucr;
> +       int err;
> +
> +       *ddr_mode = false;
> +
> +       rtsx_usb_init_cmd(ucr);
> +
> +       switch (timing) {
> +       case MMC_TIMING_UHS_SDR104:
> +       case MMC_TIMING_UHS_SDR50:
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
> +                               0x0C | SD_ASYNC_FIFO_RST,
> +                               SD_30_MODE | SD_ASYNC_FIFO_RST);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
> +                               CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
> +               break;
> +
> +       case MMC_TIMING_UHS_DDR50:
> +               *ddr_mode = true;
> +
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
> +                               0x0C | SD_ASYNC_FIFO_RST,
> +                               SD_DDR_MODE | SD_ASYNC_FIFO_RST);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
> +                               CRC_VAR_CLK0 | SD30_FIX_CLK | SAMPLE_VAR_CLK1);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
> +                               DDR_VAR_TX_CMD_DAT, DDR_VAR_TX_CMD_DAT);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
> +                               DDR_VAR_RX_DAT | DDR_VAR_RX_CMD,
> +                               DDR_VAR_RX_DAT | DDR_VAR_RX_CMD);
> +               break;
> +
> +       case MMC_TIMING_MMC_HS:
> +       case MMC_TIMING_SD_HS:
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1,
> +                               0x0C, SD_20_MODE);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
> +                               CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PUSH_POINT_CTL,
> +                               SD20_TX_SEL_MASK, SD20_TX_14_AHEAD);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
> +                               SD20_RX_SEL_MASK, SD20_RX_14_DELAY);
> +               break;
> +
> +       default:
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                               SD_CFG1, 0x0C, SD_20_MODE);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CARD_CLK_SOURCE, 0xFF,
> +                               CRC_FIX_CLK | SD30_VAR_CLK0 | SAMPLE_VAR_CLK1);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD,
> +                               SD_PUSH_POINT_CTL, 0xFF, 0);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_SAMPLE_POINT_CTL,
> +                               SD20_RX_SEL_MASK, SD20_RX_POS_EDGE);
> +               break;
> +       }
> +
> +       err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
> +
> +       return err;
> +}
> +
> +static void sdmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> +{
> +       struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
> +       struct rtsx_ucr *ucr = host->ucr;
> +
> +       dev_dbg(sdmmc_dev(host), "%s\n", __func__);
> +       mutex_lock(&ucr->dev_mutex);
> +
> +       if (rtsx_usb_card_exclusive_check(ucr, RTSX_USB_SD_CARD)) {
> +               mutex_unlock(&ucr->dev_mutex);
> +               return;
> +       }
> +
> +       sd_set_power_mode(host, ios->power_mode);
> +       sd_set_bus_width(host, ios->bus_width);
> +       sd_set_timing(host, ios->timing, &host->ddr_mode);
> +
> +       host->vpclk = false;
> +       host->double_clk = true;
> +
> +       switch (ios->timing) {
> +       case MMC_TIMING_UHS_SDR104:
> +       case MMC_TIMING_UHS_SDR50:
> +               host->ssc_depth = SSC_DEPTH_2M;
> +               host->vpclk = true;
> +               host->double_clk = false;
> +               break;
> +       case MMC_TIMING_UHS_DDR50:
> +       case MMC_TIMING_UHS_SDR25:
> +               host->ssc_depth = SSC_DEPTH_1M;
> +               break;
> +       default:
> +               host->ssc_depth = SSC_DEPTH_512K;
> +               break;
> +       }
> +
> +       host->initial_mode = (ios->clock <= 1000000) ? true : false;
> +       host->clock = ios->clock;
> +
> +       rtsx_usb_switch_clock(host->ucr, host->clock, host->ssc_depth,
> +                       host->initial_mode, host->double_clk, host->vpclk);
> +
> +       mutex_unlock(&ucr->dev_mutex);
> +       dev_dbg(sdmmc_dev(host), "%s end\n", __func__);
> +}
> +
> +static int sdmmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
> +{
> +       struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
> +       struct rtsx_ucr *ucr = host->ucr;
> +       int err = 0;
> +
> +       dev_dbg(sdmmc_dev(host), "%s: signal_voltage = %d\n",
> +                       __func__, ios->signal_voltage);
> +
> +       if (host->host_removal)
> +               return -ENOMEDIUM;
> +
> +       if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_120)
> +               return -EPERM;
> +
> +       mutex_lock(&ucr->dev_mutex);
> +
> +       err = rtsx_usb_card_exclusive_check(ucr, RTSX_USB_SD_CARD);
> +       if (err) {
> +               mutex_unlock(&ucr->dev_mutex);
> +               return err;
> +       }
> +
> +       /* Let mmc core do the busy checking, simply stop the forced-toggle
> +        * clock(while issuing CMD11) and switch voltage.
> +        */
> +       rtsx_usb_init_cmd(ucr);
> +
> +       if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PAD_CTL,
> +                               SD_IO_USING_1V8, SD_IO_USING_3V3);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, LDO_POWER_CFG,
> +                               TUNE_SD18_MASK, TUNE_SD18_3V3);
> +       } else {
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_BUS_STAT,
> +                               SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
> +                               SD_CLK_FORCE_STOP);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_PAD_CTL,
> +                               SD_IO_USING_1V8, SD_IO_USING_1V8);
> +               rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, LDO_POWER_CFG,
> +                               TUNE_SD18_MASK, TUNE_SD18_1V8);
> +       }
> +
> +       err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
> +       mutex_unlock(&ucr->dev_mutex);
> +
> +       return err;
> +}
> +
> +static int sdmmc_card_busy(struct mmc_host *mmc)
> +{
> +       struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
> +       struct rtsx_ucr *ucr = host->ucr;
> +       int err;
> +       u8 stat;
> +       u8 mask = SD_DAT3_STATUS | SD_DAT2_STATUS | SD_DAT1_STATUS
> +               | SD_DAT0_STATUS;
> +
> +       dev_dbg(sdmmc_dev(host), "%s\n", __func__);
> +
> +       mutex_lock(&ucr->dev_mutex);
> +
> +       err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
> +                       SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP,
> +                       SD_CLK_TOGGLE_EN);
> +       if (err)
> +               goto out;
> +
> +       mdelay(1);
> +
> +       err = rtsx_usb_read_register(ucr, SD_BUS_STAT, &stat);
> +       if (err)
> +               goto out;
> +
> +       err = rtsx_usb_write_register(ucr, SD_BUS_STAT,
> +                       SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
> +out:
> +       mutex_unlock(&ucr->dev_mutex);
> +
> +       if (err)
> +               return err;
> +
> +       /* check if any pin between dat[0:3] is low */
> +       if ((stat & mask) != mask)
> +               return 1;
> +       else
> +               return 0;
> +}
> +
> +static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
> +{
> +       struct rtsx_usb_sdmmc *host = mmc_priv(mmc);
> +       struct rtsx_ucr *ucr = host->ucr;
> +       int err = 0;
> +
> +       if (host->host_removal)
> +               return -ENOMEDIUM;
> +
> +       mutex_lock(&ucr->dev_mutex);
> +
> +       if (!host->ddr_mode)
> +               err = sd_tuning_rx(host, MMC_SEND_TUNING_BLOCK);
> +
> +       mutex_unlock(&ucr->dev_mutex);
> +
> +       return err;
> +}
> +
> +static const struct mmc_host_ops rtsx_usb_sdmmc_ops = {
> +       .request = sdmmc_request,
> +       .set_ios = sdmmc_set_ios,
> +       .get_ro = sdmmc_get_ro,
> +       .get_cd = sdmmc_get_cd,
> +       .start_signal_voltage_switch = sdmmc_switch_voltage,
> +       .card_busy = sdmmc_card_busy,
> +       .execute_tuning = sdmmc_execute_tuning,
> +};
> +
> +#ifdef RTSX_USB_USE_LEDS_CLASS
> +static void rtsx_usb_led_control(struct led_classdev *led,
> +       enum led_brightness brightness)
> +{
> +       struct rtsx_usb_sdmmc *host = container_of(led,
> +                       struct rtsx_usb_sdmmc, led);
> +
> +       if (host->host_removal)
> +               return;
> +
> +       host->led.brightness = brightness;
> +       schedule_work(&host->led_work);
> +}
> +
> +static void rtsx_usb_update_led(struct work_struct *work)
> +{
> +       struct rtsx_usb_sdmmc *host =
> +               container_of(work, struct rtsx_usb_sdmmc, led_work);
> +       struct rtsx_ucr *ucr = host->ucr;
> +
> +       mutex_lock(&ucr->dev_mutex);
> +
> +       if (host->led.brightness == LED_OFF)
> +               rtsx_usb_turn_off_led(ucr);
> +       else
> +               rtsx_usb_turn_on_led(ucr);
> +
> +       mutex_unlock(&ucr->dev_mutex);
> +}
> +#endif
> +
> +static void rtsx_usb_init_host(struct rtsx_usb_sdmmc *host)
> +{
> +       struct mmc_host *mmc = host->mmc;
> +
> +       mmc->f_min = 250000;
> +       mmc->f_max = 208000000;
> +       mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
> +       mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SD_HIGHSPEED |
> +               MMC_CAP_MMC_HIGHSPEED | MMC_CAP_BUS_WIDTH_TEST |
> +               MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | MMC_CAP_UHS_SDR50 |
> +               MMC_CAP_NEEDS_POLL;
> +
> +       mmc->max_current_330 = 400;
> +       mmc->max_current_180 = 800;
> +       mmc->ops = &rtsx_usb_sdmmc_ops;
> +       mmc->max_segs = 256;
> +       mmc->max_seg_size = 65536;
> +       mmc->max_blk_size = 512;
> +       mmc->max_blk_count = 65535;
> +       mmc->max_req_size = 524288;
> +
> +       host->power_mode = MMC_POWER_OFF;
> +}
> +
> +static int rtsx_usb_sdmmc_drv_probe(struct platform_device *pdev)
> +{
> +       struct mmc_host *mmc;
> +       struct rtsx_usb_sdmmc *host;
> +       struct rtsx_ucr *ucr;
> +#ifdef RTSX_USB_USE_LEDS_CLASS
> +       int err;
> +#endif
> +
> +       ucr = usb_get_intfdata(to_usb_interface(pdev->dev.parent));
> +       if (!ucr)
> +               return -ENXIO;
> +
> +       dev_dbg(&(pdev->dev), ": Realtek USB SD/MMC controller found\n");
> +
> +       mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
> +       if (!mmc)
> +               return -ENOMEM;
> +
> +       host = mmc_priv(mmc);
> +       host->ucr = ucr;
> +       host->mmc = mmc;
> +       host->pdev = pdev;
> +       platform_set_drvdata(pdev, host);
> +
> +       mutex_init(&host->host_mutex);
> +       rtsx_usb_init_host(host);
> +       pm_runtime_enable(&pdev->dev);
> +
> +#ifdef RTSX_USB_USE_LEDS_CLASS
> +       snprintf(host->led_name, sizeof(host->led_name),
> +               "%s::", mmc_hostname(mmc));
> +       host->led.name = host->led_name;
> +       host->led.brightness = LED_OFF;
> +       host->led.default_trigger = mmc_hostname(mmc);
> +       host->led.brightness_set = rtsx_usb_led_control;
> +
> +       err = led_classdev_register(mmc_dev(mmc), &host->led);
> +       if (err)
> +               dev_err(&(pdev->dev),
> +                               "Failed to register LED device: %d\n", err);
> +       INIT_WORK(&host->led_work, rtsx_usb_update_led);
> +
> +#endif
> +       mmc_add_host(mmc);
> +
> +       return 0;
> +}
> +
> +static int rtsx_usb_sdmmc_drv_remove(struct platform_device *pdev)
> +{
> +       struct rtsx_usb_sdmmc *host = platform_get_drvdata(pdev);
> +       struct mmc_host *mmc;
> +
> +       if (!host)
> +               return 0;
> +
> +       mmc = host->mmc;
> +       host->host_removal = true;
> +
> +       mutex_lock(&host->host_mutex);
> +       if (host->mrq) {
> +               dev_dbg(&(pdev->dev),
> +                       "%s: Controller removed during transfer\n",
> +                       mmc_hostname(mmc));
> +               host->mrq->cmd->error = -ENOMEDIUM;
> +               if (host->mrq->stop)
> +                       host->mrq->stop->error = -ENOMEDIUM;
> +               mmc_request_done(mmc, host->mrq);
> +       }
> +       mutex_unlock(&host->host_mutex);
> +
> +       mmc_remove_host(mmc);
> +
> +#ifdef RTSX_USB_USE_LEDS_CLASS
> +       cancel_work_sync(&host->led_work);
> +       led_classdev_unregister(&host->led);
> +#endif
> +
> +       mmc_free_host(mmc);
> +
> +       /* Balance possible unbalanced usage count
> +        * e.g. unconditional module removal
> +        */
> +       if (pm_runtime_active(&pdev->dev))
> +               pm_runtime_put(&pdev->dev);

This shouldn't be needed.

mmc_remove_host() will invoke your ->set_ios() callback with
power_mode set to MMC_POWER_OFF.

> +
> +       pm_runtime_disable(&pdev->dev);
> +       platform_set_drvdata(pdev, NULL);
> +
> +       dev_dbg(&(pdev->dev),
> +               ": Realtek USB SD/MMC module has been removed\n");
> +
> +       return 0;
> +}
> +
> +static struct platform_device_id rtsx_usb_sdmmc_ids[] = {
> +       {
> +               .name = "rtsx_usb_sdmmc",
> +       }, {
> +               /* sentinel */
> +       }
> +};
> +MODULE_DEVICE_TABLE(platform, rtsx_usb_sdmmc_ids);
> +
> +static struct platform_driver rtsx_usb_sdmmc_driver = {
> +       .probe          = rtsx_usb_sdmmc_drv_probe,
> +       .remove         = rtsx_usb_sdmmc_drv_remove,
> +       .id_table       = rtsx_usb_sdmmc_ids,
> +       .driver         = {
> +               .owner  = THIS_MODULE,
> +               .name   = "rtsx_usb_sdmmc",
> +       },
> +};
> +module_platform_driver(rtsx_usb_sdmmc_driver);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_AUTHOR("Roger Tseng <rogerable@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Realtek USB SD/MMC Card Host Driver");
> --
> 1.8.2
>

Fix the minor thing above and you may add my ack!

Kind regards
Ulf Hansson
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