// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
 * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
 */

#include <common.h>
#include <clk.h>
#include <cpu_func.h>
#include <dm.h>
#include <fdtdec.h>
#include <linux/libfdt.h>
#include <mmc.h>
#include <reset.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <linux/iopoll.h>
#include <watchdog.h>

struct stm32_sdmmc2_plat {
        struct mmc_config cfg;
        struct mmc mmc;
};

struct stm32_sdmmc2_priv {
        fdt_addr_t base;
        struct clk clk;
        struct reset_ctl reset_ctl;
        struct gpio_desc cd_gpio;
        u32 clk_reg_msk;
        u32 pwr_reg_msk;
};

struct stm32_sdmmc2_ctx {
        u32 cache_start;
        u32 cache_end;
        u32 data_length;
        bool dpsm_abort;
};

/* SDMMC REGISTERS OFFSET */
#define SDMMC_POWER             0x00    /* SDMMC power control             */
#define SDMMC_CLKCR             0x04    /* SDMMC clock control             */
#define SDMMC_ARG               0x08    /* SDMMC argument                  */
#define SDMMC_CMD               0x0C    /* SDMMC command                   */
#define SDMMC_RESP1             0x14    /* SDMMC response 1                */
#define SDMMC_RESP2             0x18    /* SDMMC response 2                */
#define SDMMC_RESP3             0x1C    /* SDMMC response 3                */
#define SDMMC_RESP4             0x20    /* SDMMC response 4                */
#define SDMMC_DTIMER            0x24    /* SDMMC data timer                */
#define SDMMC_DLEN              0x28    /* SDMMC data length               */
#define SDMMC_DCTRL             0x2C    /* SDMMC data control              */
#define SDMMC_DCOUNT            0x30    /* SDMMC data counter              */
#define SDMMC_STA               0x34    /* SDMMC status                    */
#define SDMMC_ICR               0x38    /* SDMMC interrupt clear           */
#define SDMMC_MASK              0x3C    /* SDMMC mask                      */
#define SDMMC_IDMACTRL          0x50    /* SDMMC DMA control               */
#define SDMMC_IDMABASE0         0x58    /* SDMMC DMA buffer 0 base address */

/* SDMMC_POWER register */
#define SDMMC_POWER_PWRCTRL_MASK        GENMASK(1, 0)
#define SDMMC_POWER_PWRCTRL_OFF         0
#define SDMMC_POWER_PWRCTRL_CYCLE       2
#define SDMMC_POWER_PWRCTRL_ON          3
#define SDMMC_POWER_VSWITCH             BIT(2)
#define SDMMC_POWER_VSWITCHEN           BIT(3)
#define SDMMC_POWER_DIRPOL              BIT(4)

/* SDMMC_CLKCR register */
#define SDMMC_CLKCR_CLKDIV              GENMASK(9, 0)
#define SDMMC_CLKCR_CLKDIV_MAX          SDMMC_CLKCR_CLKDIV
#define SDMMC_CLKCR_PWRSAV              BIT(12)
#define SDMMC_CLKCR_WIDBUS_4            BIT(14)
#define SDMMC_CLKCR_WIDBUS_8            BIT(15)
#define SDMMC_CLKCR_NEGEDGE             BIT(16)
#define SDMMC_CLKCR_HWFC_EN             BIT(17)
#define SDMMC_CLKCR_DDR                 BIT(18)
#define SDMMC_CLKCR_BUSSPEED            BIT(19)
#define SDMMC_CLKCR_SELCLKRX_MASK       GENMASK(21, 20)
#define SDMMC_CLKCR_SELCLKRX_CK         0
#define SDMMC_CLKCR_SELCLKRX_CKIN       BIT(20)
#define SDMMC_CLKCR_SELCLKRX_FBCK       BIT(21)

/* SDMMC_CMD register */
#define SDMMC_CMD_CMDINDEX              GENMASK(5, 0)
#define SDMMC_CMD_CMDTRANS              BIT(6)
#define SDMMC_CMD_CMDSTOP               BIT(7)
#define SDMMC_CMD_WAITRESP              GENMASK(9, 8)
#define SDMMC_CMD_WAITRESP_0            BIT(8)
#define SDMMC_CMD_WAITRESP_1            BIT(9)
#define SDMMC_CMD_WAITINT               BIT(10)
#define SDMMC_CMD_WAITPEND              BIT(11)
#define SDMMC_CMD_CPSMEN                BIT(12)
#define SDMMC_CMD_DTHOLD                BIT(13)
#define SDMMC_CMD_BOOTMODE              BIT(14)
#define SDMMC_CMD_BOOTEN                BIT(15)
#define SDMMC_CMD_CMDSUSPEND            BIT(16)

/* SDMMC_DCTRL register */
#define SDMMC_DCTRL_DTEN                BIT(0)
#define SDMMC_DCTRL_DTDIR               BIT(1)
#define SDMMC_DCTRL_DTMODE              GENMASK(3, 2)
#define SDMMC_DCTRL_DBLOCKSIZE          GENMASK(7, 4)
#define SDMMC_DCTRL_DBLOCKSIZE_SHIFT    4
#define SDMMC_DCTRL_RWSTART             BIT(8)
#define SDMMC_DCTRL_RWSTOP              BIT(9)
#define SDMMC_DCTRL_RWMOD               BIT(10)
#define SDMMC_DCTRL_SDMMCEN             BIT(11)
#define SDMMC_DCTRL_BOOTACKEN           BIT(12)
#define SDMMC_DCTRL_FIFORST             BIT(13)

/* SDMMC_STA register */
#define SDMMC_STA_CCRCFAIL              BIT(0)
#define SDMMC_STA_DCRCFAIL              BIT(1)
#define SDMMC_STA_CTIMEOUT              BIT(2)
#define SDMMC_STA_DTIMEOUT              BIT(3)
#define SDMMC_STA_TXUNDERR              BIT(4)
#define SDMMC_STA_RXOVERR               BIT(5)
#define SDMMC_STA_CMDREND               BIT(6)
#define SDMMC_STA_CMDSENT               BIT(7)
#define SDMMC_STA_DATAEND               BIT(8)
#define SDMMC_STA_DHOLD                 BIT(9)
#define SDMMC_STA_DBCKEND               BIT(10)
#define SDMMC_STA_DABORT                BIT(11)
#define SDMMC_STA_DPSMACT               BIT(12)
#define SDMMC_STA_CPSMACT               BIT(13)
#define SDMMC_STA_TXFIFOHE              BIT(14)
#define SDMMC_STA_RXFIFOHF              BIT(15)
#define SDMMC_STA_TXFIFOF               BIT(16)
#define SDMMC_STA_RXFIFOF               BIT(17)
#define SDMMC_STA_TXFIFOE               BIT(18)
#define SDMMC_STA_RXFIFOE               BIT(19)
#define SDMMC_STA_BUSYD0                BIT(20)
#define SDMMC_STA_BUSYD0END             BIT(21)
#define SDMMC_STA_SDMMCIT               BIT(22)
#define SDMMC_STA_ACKFAIL               BIT(23)
#define SDMMC_STA_ACKTIMEOUT            BIT(24)
#define SDMMC_STA_VSWEND                BIT(25)
#define SDMMC_STA_CKSTOP                BIT(26)
#define SDMMC_STA_IDMATE                BIT(27)
#define SDMMC_STA_IDMABTC               BIT(28)

/* SDMMC_ICR register */
#define SDMMC_ICR_CCRCFAILC             BIT(0)
#define SDMMC_ICR_DCRCFAILC             BIT(1)
#define SDMMC_ICR_CTIMEOUTC             BIT(2)
#define SDMMC_ICR_DTIMEOUTC             BIT(3)
#define SDMMC_ICR_TXUNDERRC             BIT(4)
#define SDMMC_ICR_RXOVERRC              BIT(5)
#define SDMMC_ICR_CMDRENDC              BIT(6)
#define SDMMC_ICR_CMDSENTC              BIT(7)
#define SDMMC_ICR_DATAENDC              BIT(8)
#define SDMMC_ICR_DHOLDC                BIT(9)
#define SDMMC_ICR_DBCKENDC              BIT(10)
#define SDMMC_ICR_DABORTC               BIT(11)
#define SDMMC_ICR_BUSYD0ENDC            BIT(21)
#define SDMMC_ICR_SDMMCITC              BIT(22)
#define SDMMC_ICR_ACKFAILC              BIT(23)
#define SDMMC_ICR_ACKTIMEOUTC           BIT(24)
#define SDMMC_ICR_VSWENDC               BIT(25)
#define SDMMC_ICR_CKSTOPC               BIT(26)
#define SDMMC_ICR_IDMATEC               BIT(27)
#define SDMMC_ICR_IDMABTCC              BIT(28)
#define SDMMC_ICR_STATIC_FLAGS          ((GENMASK(28, 21)) | (GENMASK(11, 0)))

/* SDMMC_MASK register */
#define SDMMC_MASK_CCRCFAILIE           BIT(0)
#define SDMMC_MASK_DCRCFAILIE           BIT(1)
#define SDMMC_MASK_CTIMEOUTIE           BIT(2)
#define SDMMC_MASK_DTIMEOUTIE           BIT(3)
#define SDMMC_MASK_TXUNDERRIE           BIT(4)
#define SDMMC_MASK_RXOVERRIE            BIT(5)
#define SDMMC_MASK_CMDRENDIE            BIT(6)
#define SDMMC_MASK_CMDSENTIE            BIT(7)
#define SDMMC_MASK_DATAENDIE            BIT(8)
#define SDMMC_MASK_DHOLDIE              BIT(9)
#define SDMMC_MASK_DBCKENDIE            BIT(10)
#define SDMMC_MASK_DABORTIE             BIT(11)
#define SDMMC_MASK_TXFIFOHEIE           BIT(14)
#define SDMMC_MASK_RXFIFOHFIE           BIT(15)
#define SDMMC_MASK_RXFIFOFIE            BIT(17)
#define SDMMC_MASK_TXFIFOEIE            BIT(18)
#define SDMMC_MASK_BUSYD0ENDIE          BIT(21)
#define SDMMC_MASK_SDMMCITIE            BIT(22)
#define SDMMC_MASK_ACKFAILIE            BIT(23)
#define SDMMC_MASK_ACKTIMEOUTIE         BIT(24)
#define SDMMC_MASK_VSWENDIE             BIT(25)
#define SDMMC_MASK_CKSTOPIE             BIT(26)
#define SDMMC_MASK_IDMABTCIE            BIT(28)

/* SDMMC_IDMACTRL register */
#define SDMMC_IDMACTRL_IDMAEN           BIT(0)

#define SDMMC_CMD_TIMEOUT               0xFFFFFFFF
#define SDMMC_BUSYD0END_TIMEOUT_US      2000000

static void stm32_sdmmc2_start_data(struct stm32_sdmmc2_priv *priv,
                                    struct mmc_data *data,
                                    struct stm32_sdmmc2_ctx *ctx)
{
        u32 data_ctrl, idmabase0;

        /* Configure the SDMMC DPSM (Data Path State Machine) */
        data_ctrl = (__ilog2(data->blocksize) <<
                     SDMMC_DCTRL_DBLOCKSIZE_SHIFT) &
                    SDMMC_DCTRL_DBLOCKSIZE;

        if (data->flags & MMC_DATA_READ) {
                data_ctrl |= SDMMC_DCTRL_DTDIR;
                idmabase0 = (u32)data->dest;
        } else {
                idmabase0 = (u32)data->src;
        }

        /* Set the SDMMC DataLength value */
        writel(ctx->data_length, priv->base + SDMMC_DLEN);

        /* Write to SDMMC DCTRL */
        writel(data_ctrl, priv->base + SDMMC_DCTRL);

        /* Cache align */
        ctx->cache_start = rounddown(idmabase0, ARCH_DMA_MINALIGN);
        ctx->cache_end = roundup(idmabase0 + ctx->data_length,
                                 ARCH_DMA_MINALIGN);

        /*
         * Flush data cache before DMA start (clean and invalidate)
         * Clean also needed for read
         * Avoid issue on buffer not cached-aligned
         */
        flush_dcache_range(ctx->cache_start, ctx->cache_end);

        /* Enable internal DMA */
        writel(idmabase0, priv->base + SDMMC_IDMABASE0);
        writel(SDMMC_IDMACTRL_IDMAEN, priv->base + SDMMC_IDMACTRL);
}

static void stm32_sdmmc2_start_cmd(struct stm32_sdmmc2_priv *priv,
                                   struct mmc_cmd *cmd, u32 cmd_param,
                                   struct stm32_sdmmc2_ctx *ctx)
{
        u32 timeout = 0;

        if (readl(priv->base + SDMMC_CMD) & SDMMC_CMD_CPSMEN)
                writel(0, priv->base + SDMMC_CMD);

        cmd_param |= cmd->cmdidx | SDMMC_CMD_CPSMEN;
        if (cmd->resp_type & MMC_RSP_PRESENT) {
                if (cmd->resp_type & MMC_RSP_136)
                        cmd_param |= SDMMC_CMD_WAITRESP;
                else if (cmd->resp_type & MMC_RSP_CRC)
                        cmd_param |= SDMMC_CMD_WAITRESP_0;
                else
                        cmd_param |= SDMMC_CMD_WAITRESP_1;
        }

        /*
         * SDMMC_DTIME must be set in two case:
         * - on data transfert.
         * - on busy request.
         * If not done or too short, the dtimeout flag occurs and DPSM stays
         * enabled/busy and waits for abort (stop transmission cmd).
         * Next data command is not possible whereas DPSM is activated.
         */
        if (ctx->data_length) {
                timeout = SDMMC_CMD_TIMEOUT;
        } else {
                writel(0, priv->base + SDMMC_DCTRL);

                if (cmd->resp_type & MMC_RSP_BUSY)
                        timeout = SDMMC_CMD_TIMEOUT;
        }

        /* Set the SDMMC Data TimeOut value */
        writel(timeout, priv->base + SDMMC_DTIMER);

        /* Clear flags */
        writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);

        /* Set SDMMC argument value */
        writel(cmd->cmdarg, priv->base + SDMMC_ARG);

        /* Set SDMMC command parameters */
        writel(cmd_param, priv->base + SDMMC_CMD);
}

static int stm32_sdmmc2_end_cmd(struct stm32_sdmmc2_priv *priv,
                                struct mmc_cmd *cmd,
                                struct stm32_sdmmc2_ctx *ctx)
{
        u32 mask = SDMMC_STA_CTIMEOUT;
        u32 status;
        int ret;

        if (cmd->resp_type & MMC_RSP_PRESENT) {
                mask |= SDMMC_STA_CMDREND;
                if (cmd->resp_type & MMC_RSP_CRC)
                        mask |= SDMMC_STA_CCRCFAIL;
        } else {
                mask |= SDMMC_STA_CMDSENT;
        }

        /* Polling status register */
        ret = readl_poll_timeout(priv->base + SDMMC_STA, status, status & mask,
                                 10000);

        if (ret < 0) {
                debug("%s: timeout reading SDMMC_STA register\n", __func__);
                ctx->dpsm_abort = true;
                return ret;
        }

        /* Check status */
        if (status & SDMMC_STA_CTIMEOUT) {
                debug("%s: error SDMMC_STA_CTIMEOUT (0x%x) for cmd %d\n",
                      __func__, status, cmd->cmdidx);
                ctx->dpsm_abort = true;
                return -ETIMEDOUT;
        }

        if (status & SDMMC_STA_CCRCFAIL && cmd->resp_type & MMC_RSP_CRC) {
                debug("%s: error SDMMC_STA_CCRCFAIL (0x%x) for cmd %d\n",
                      __func__, status, cmd->cmdidx);
                ctx->dpsm_abort = true;
                return -EILSEQ;
        }

        if (status & SDMMC_STA_CMDREND && cmd->resp_type & MMC_RSP_PRESENT) {
                cmd->response[0] = readl(priv->base + SDMMC_RESP1);
                if (cmd->resp_type & MMC_RSP_136) {
                        cmd->response[1] = readl(priv->base + SDMMC_RESP2);
                        cmd->response[2] = readl(priv->base + SDMMC_RESP3);
                        cmd->response[3] = readl(priv->base + SDMMC_RESP4);
                }

                /* Wait for BUSYD0END flag if busy status is detected */
                if (cmd->resp_type & MMC_RSP_BUSY &&
                    status & SDMMC_STA_BUSYD0) {
                        mask = SDMMC_STA_DTIMEOUT | SDMMC_STA_BUSYD0END;

                        /* Polling status register */
                        ret = readl_poll_timeout(priv->base + SDMMC_STA,
                                                 status, status & mask,
                                                 SDMMC_BUSYD0END_TIMEOUT_US);

                        if (ret < 0) {
                                debug("%s: timeout reading SDMMC_STA\n",
                                      __func__);
                                ctx->dpsm_abort = true;
                                return ret;
                        }

                        if (status & SDMMC_STA_DTIMEOUT) {
                                debug("%s: error SDMMC_STA_DTIMEOUT (0x%x)\n",
                                      __func__, status);
                                ctx->dpsm_abort = true;
                                return -ETIMEDOUT;
                        }
                }
        }

        return 0;
}

static int stm32_sdmmc2_end_data(struct stm32_sdmmc2_priv *priv,
                                 struct mmc_cmd *cmd,
                                 struct mmc_data *data,
                                 struct stm32_sdmmc2_ctx *ctx)
{
        u32 mask = SDMMC_STA_DCRCFAIL | SDMMC_STA_DTIMEOUT |
                   SDMMC_STA_IDMATE | SDMMC_STA_DATAEND;
        u32 status;

        if (data->flags & MMC_DATA_READ)
                mask |= SDMMC_STA_RXOVERR;
        else
                mask |= SDMMC_STA_TXUNDERR;

        status = readl(priv->base + SDMMC_STA);
        while (!(status & mask))
                status = readl(priv->base + SDMMC_STA);

        /*
         * Need invalidate the dcache again to avoid any
         * cache-refill during the DMA operations (pre-fetching)
         */
        if (data->flags & MMC_DATA_READ)
                invalidate_dcache_range(ctx->cache_start, ctx->cache_end);

        if (status & SDMMC_STA_DCRCFAIL) {
                debug("%s: error SDMMC_STA_DCRCFAIL (0x%x) for cmd %d\n",
                      __func__, status, cmd->cmdidx);
                if (readl(priv->base + SDMMC_DCOUNT))
                        ctx->dpsm_abort = true;
                return -EILSEQ;
        }

        if (status & SDMMC_STA_DTIMEOUT) {
                debug("%s: error SDMMC_STA_DTIMEOUT (0x%x) for cmd %d\n",
                      __func__, status, cmd->cmdidx);
                ctx->dpsm_abort = true;
                return -ETIMEDOUT;
        }

        if (status & SDMMC_STA_TXUNDERR) {
                debug("%s: error SDMMC_STA_TXUNDERR (0x%x) for cmd %d\n",
                      __func__, status, cmd->cmdidx);
                ctx->dpsm_abort = true;
                return -EIO;
        }

        if (status & SDMMC_STA_RXOVERR) {
                debug("%s: error SDMMC_STA_RXOVERR (0x%x) for cmd %d\n",
                      __func__, status, cmd->cmdidx);
                ctx->dpsm_abort = true;
                return -EIO;
        }

        if (status & SDMMC_STA_IDMATE) {
                debug("%s: error SDMMC_STA_IDMATE (0x%x) for cmd %d\n",
                      __func__, status, cmd->cmdidx);
                ctx->dpsm_abort = true;
                return -EIO;
        }

        return 0;
}

static int stm32_sdmmc2_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
                                 struct mmc_data *data)
{
        struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
        struct stm32_sdmmc2_ctx ctx;
        u32 cmdat = data ? SDMMC_CMD_CMDTRANS : 0;
        int ret, retry = 3;

        WATCHDOG_RESET();

retry_cmd:
        ctx.data_length = 0;
        ctx.dpsm_abort = false;

        if (data) {
                ctx.data_length = data->blocks * data->blocksize;
                stm32_sdmmc2_start_data(priv, data, &ctx);
        }

        stm32_sdmmc2_start_cmd(priv, cmd, cmdat, &ctx);

        debug("%s: send cmd %d data: 0x%x @ 0x%x\n",
              __func__, cmd->cmdidx,
              data ? ctx.data_length : 0, (unsigned int)data);

        ret = stm32_sdmmc2_end_cmd(priv, cmd, &ctx);

        if (data && !ret)
                ret = stm32_sdmmc2_end_data(priv, cmd, data, &ctx);

        /* Clear flags */
        writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
        if (data)
                writel(0x0, priv->base + SDMMC_IDMACTRL);

        /*
         * To stop Data Path State Machine, a stop_transmission command
         * shall be send on cmd or data errors.
         */
        if (ctx.dpsm_abort && (cmd->cmdidx != MMC_CMD_STOP_TRANSMISSION)) {
                struct mmc_cmd stop_cmd;

                stop_cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
                stop_cmd.cmdarg = 0;
                stop_cmd.resp_type = MMC_RSP_R1b;

                debug("%s: send STOP command to abort dpsm treatments\n",
                      __func__);

                ctx.data_length = 0;

                stm32_sdmmc2_start_cmd(priv, &stop_cmd,
                                       SDMMC_CMD_CMDSTOP, &ctx);
                stm32_sdmmc2_end_cmd(priv, &stop_cmd, &ctx);

                writel(SDMMC_ICR_STATIC_FLAGS, priv->base + SDMMC_ICR);
        }

        if ((ret != -ETIMEDOUT) && (ret != 0) && retry) {
                printf("%s: cmd %d failed, retrying ...\n",
                       __func__, cmd->cmdidx);
                retry--;
                goto retry_cmd;
        }

        debug("%s: end for CMD %d, ret = %d\n", __func__, cmd->cmdidx, ret);

        return ret;
}

/*
 * Reset the SDMMC with the RCC.SDMMCxRST register bit.
 * This will reset the SDMMC to the reset state and the CPSM and DPSM
 * to the Idle state. SDMMC is disabled, Signals Hiz.
 */
static void stm32_sdmmc2_reset(struct stm32_sdmmc2_priv *priv)
{
        /* Reset */
        reset_assert(&priv->reset_ctl);
        udelay(2);
        reset_deassert(&priv->reset_ctl);

        /* init the needed SDMMC register after reset */
        writel(priv->pwr_reg_msk, priv->base + SDMMC_POWER);
}

/*
 * Set the SDMMC in power-cycle state.
 * This will make that the SDMMC_D[7:0],
 * SDMMC_CMD and SDMMC_CK are driven low, to prevent the card from being
 * supplied through the signal lines.
 */
static void stm32_sdmmc2_pwrcycle(struct stm32_sdmmc2_priv *priv)
{
        if ((readl(priv->base + SDMMC_POWER) & SDMMC_POWER_PWRCTRL_MASK) ==
            SDMMC_POWER_PWRCTRL_CYCLE)
                return;

        stm32_sdmmc2_reset(priv);
}

/*
 * set the SDMMC state Power-on: the card is clocked
 * manage the SDMMC state control:
 * Reset => Power-Cycle => Power-Off => Power
 *    PWRCTRL=10     PWCTRL=00    PWCTRL=11
 */
static void stm32_sdmmc2_pwron(struct stm32_sdmmc2_priv *priv)
{
        u32 pwrctrl =
                readl(priv->base + SDMMC_POWER) &  SDMMC_POWER_PWRCTRL_MASK;

        if (pwrctrl == SDMMC_POWER_PWRCTRL_ON)
                return;

        /* warning: same PWRCTRL value after reset and for power-off state
         * it is the reset state here = the only managed by the driver
         */
        if (pwrctrl == SDMMC_POWER_PWRCTRL_OFF) {
                writel(SDMMC_POWER_PWRCTRL_CYCLE | priv->pwr_reg_msk,
                       priv->base + SDMMC_POWER);
        }

        /*
         * the remaining case is SDMMC_POWER_PWRCTRL_CYCLE
         * switch to Power-Off state: SDMCC disable, signals drive 1
         */
        writel(SDMMC_POWER_PWRCTRL_OFF | priv->pwr_reg_msk,
               priv->base + SDMMC_POWER);

        /* After the 1ms delay set the SDMMC to power-on */
        mdelay(1);
        writel(SDMMC_POWER_PWRCTRL_ON | priv->pwr_reg_msk,
               priv->base + SDMMC_POWER);

        /* during the first 74 SDMMC_CK cycles the SDMMC is still disabled. */
}

#define IS_RISING_EDGE(reg) (reg & SDMMC_CLKCR_NEGEDGE ? 0 : 1)
static int stm32_sdmmc2_set_ios(struct udevice *dev)
{
        struct mmc *mmc = mmc_get_mmc_dev(dev);
        struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
        u32 desired = mmc->clock;
        u32 sys_clock = clk_get_rate(&priv->clk);
        u32 clk = 0;

        debug("%s: bus_with = %d, clock = %d\n", __func__,
              mmc->bus_width, mmc->clock);

        if (mmc->clk_disable)
                stm32_sdmmc2_pwrcycle(priv);
        else
                stm32_sdmmc2_pwron(priv);

        /*
         * clk_div = 0 => command and data generated on SDMMCCLK falling edge
         * clk_div > 0 and NEGEDGE = 0 => command and data generated on
         * SDMMCCLK rising edge
         * clk_div > 0 and NEGEDGE = 1 => command and data generated on
         * SDMMCCLK falling edge
         */
        if (desired && ((sys_clock > desired) ||
                        IS_RISING_EDGE(priv->clk_reg_msk))) {
                clk = DIV_ROUND_UP(sys_clock, 2 * desired);
                if (clk > SDMMC_CLKCR_CLKDIV_MAX)
                        clk = SDMMC_CLKCR_CLKDIV_MAX;
        }

        if (mmc->bus_width == 4)
                clk |= SDMMC_CLKCR_WIDBUS_4;
        if (mmc->bus_width == 8)
                clk |= SDMMC_CLKCR_WIDBUS_8;

        writel(clk | priv->clk_reg_msk | SDMMC_CLKCR_HWFC_EN,
               priv->base + SDMMC_CLKCR);

        return 0;
}

static int stm32_sdmmc2_getcd(struct udevice *dev)
{
        struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);

        debug("stm32_sdmmc2_getcd called\n");

        if (dm_gpio_is_valid(&priv->cd_gpio))
                return dm_gpio_get_value(&priv->cd_gpio);

        return 1;
}

static int stm32_sdmmc2_host_power_cycle(struct udevice *dev)
{
        struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);

        writel(SDMMC_POWER_PWRCTRL_CYCLE | priv->pwr_reg_msk,
               priv->base + SDMMC_POWER);

        return 0;
}

static const struct dm_mmc_ops stm32_sdmmc2_ops = {
        .send_cmd = stm32_sdmmc2_send_cmd,
        .set_ios = stm32_sdmmc2_set_ios,
        .get_cd = stm32_sdmmc2_getcd,
        .host_power_cycle = stm32_sdmmc2_host_power_cycle,
};

static int stm32_sdmmc2_probe(struct udevice *dev)
{
        struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
        struct stm32_sdmmc2_plat *plat = dev_get_platdata(dev);
        struct stm32_sdmmc2_priv *priv = dev_get_priv(dev);
        struct mmc_config *cfg = &plat->cfg;
        int ret;

        priv->base = dev_read_addr(dev);
        if (priv->base == FDT_ADDR_T_NONE)
                return -EINVAL;

        if (dev_read_bool(dev, "st,neg-edge"))
                priv->clk_reg_msk |= SDMMC_CLKCR_NEGEDGE;
        if (dev_read_bool(dev, "st,sig-dir"))
                priv->pwr_reg_msk |= SDMMC_POWER_DIRPOL;
        if (dev_read_bool(dev, "st,use-ckin"))
                priv->clk_reg_msk |= SDMMC_CLKCR_SELCLKRX_CKIN;

        ret = clk_get_by_index(dev, 0, &priv->clk);
        if (ret)
                return ret;

        ret = clk_enable(&priv->clk);
        if (ret)
                goto clk_free;

        ret = reset_get_by_index(dev, 0, &priv->reset_ctl);
        if (ret)
                goto clk_disable;

        gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio,
                             GPIOD_IS_IN);

        cfg->f_min = 400000;
        cfg->f_max = dev_read_u32_default(dev, "max-frequency", 52000000);
        cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
        cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
        cfg->name = "STM32 SDMMC2";

        cfg->host_caps = 0;
        if (cfg->f_max > 25000000)
                cfg->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;

        switch (dev_read_u32_default(dev, "bus-width", 1)) {
        case 8:
                cfg->host_caps |= MMC_MODE_8BIT;
                /* fall through */
        case 4:
                cfg->host_caps |= MMC_MODE_4BIT;
                break;
        case 1:
                break;
        default:
                pr_err("invalid \"bus-width\" property, force to 1\n");
        }

        upriv->mmc = &plat->mmc;

        /* SDMMC init */
        stm32_sdmmc2_reset(priv);
        return 0;

clk_disable:
        clk_disable(&priv->clk);
clk_free:
        clk_free(&priv->clk);

        return ret;
}

static int stm32_sdmmc_bind(struct udevice *dev)
{
        struct stm32_sdmmc2_plat *plat = dev_get_platdata(dev);

        return mmc_bind(dev, &plat->mmc, &plat->cfg);
}

static const struct udevice_id stm32_sdmmc2_ids[] = {
        { .compatible = "st,stm32-sdmmc2" },
        { }
};

U_BOOT_DRIVER(stm32_sdmmc2) = {
        .name = "stm32_sdmmc2",
        .id = UCLASS_MMC,
        .of_match = stm32_sdmmc2_ids,
        .ops = &stm32_sdmmc2_ops,
        .probe = stm32_sdmmc2_probe,
        .bind = stm32_sdmmc_bind,
        .priv_auto_alloc_size = sizeof(struct stm32_sdmmc2_priv),
        .platdata_auto_alloc_size = sizeof(struct stm32_sdmmc2_plat),
};