From: Patrice Chotard patrice.chotard@st.com

This patch adds SD/MMC support for STM32H7 SoCs.

Here is an extraction of SDMMC main features, embedded in STM32H7 SoCs. The SD/MMC block include the following: _ Full compliance with MultiMediaCard System Specification Version 4.51. Card support for three different databus modes: 1-bit (default), 4-bit and 8-bit. _ Full compatibility with previous versions of MultiMediaCards (backward compatibility). _ Full compliance with SD memory card specifications version 4.1. (SDR104 SDMMC_CK speed limited to maximum allowed IO speed, SPI mode and UHS-II mode not supported). _ Full compliance with SDIO card specification version 4.0. Card support for two different databus modes: 1-bit (default) and 4-bit. (SDR104 SDMMC_CK speed limited to maximum allowed IO speed, SPI mode and UHS-II mode not supported). _ Data transfer up to 208 Mbyte/s for the 8 bit mode. (depending maximum allowed IO speed). _ Data and command output enable signals to control external bidirectional drivers.

The current version of the SDMMC supports only one SD/SDIO/MMC card at any one time and a stack of MMC Version 4.51 or previous.

Signed-off-by: Christophe Kerello christophe.kerello@st.com Signed-off-by: Patrice Chotard patrice.chotard@st.com ---

v5: _ give a more meaningful name to stm32_sdmmc2_start_cmd() last param _ use readl_poll_timeout() instead of using while in stm32_sdmmc2_end_cmd() v4: _ replace mmc_create() usage by mmc_bind() callback _ rename struct stm32_sdmmc2_host to stm32_sdmmc2_priv v3: _ use registers offset instead of registers struct description _ rename clk_reg_add and pwr_reg_add to respectively clk_reg_msk and pwr_reg_msk _ don't exit in error if DT bus-width value is not correct, force it to 1 and continue v2: _ add .get_cd() callback support

drivers/mmc/Kconfig | 8 + drivers/mmc/Makefile | 1 + drivers/mmc/stm32_sdmmc2.c | 608 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 617 insertions(+) create mode 100644 drivers/mmc/stm32_sdmmc2.c

diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index 82b8d75..6ac7ab2 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -377,6 +377,14 @@ config GENERIC_ATMEL_MCI the SD Memory Card Specification V2.0, the SDIO V2.0 specification and CE-ATA V1.1.

+config STM32_SDMMC2 + bool "STMicroelectronics STM32H7 SD/MMC Host Controller support" + depends on DM_MMC && BLK && OF_CONTROL && DM_MMC_OPS + help + This selects support for the SD/MMC controller on STM32H7 SoCs. + If you have a board based on such a SoC and with a SD/MMC slot, + say Y or M here. + endif

config TEGRA124_MMC_DISABLE_EXT_LOOPBACK diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile index 2d781c3..2584663 100644 --- a/drivers/mmc/Makefile +++ b/drivers/mmc/Makefile @@ -43,6 +43,7 @@ obj-$(CONFIG_SUPPORT_EMMC_RPMB) += rpmb.o obj-$(CONFIG_MMC_SANDBOX) += sandbox_mmc.o obj-$(CONFIG_SH_MMCIF) += sh_mmcif.o obj-$(CONFIG_SH_SDHI) += sh_sdhi.o +obj-$(CONFIG_STM32_SDMMC2) += stm32_sdmmc2.o

# SDHCI obj-$(CONFIG_MMC_SDHCI) += sdhci.o diff --git a/drivers/mmc/stm32_sdmmc2.c b/drivers/mmc/stm32_sdmmc2.c new file mode 100644 index 0000000..0e1f40b --- /dev/null +++ b/drivers/mmc/stm32_sdmmc2.c @@ -0,0 +1,608 @@ +/* + * Copyright (C) STMicroelectronics SA 2017 + * Author(s): Patrice CHOTARD, patrice.chotard@st.com for STMicroelectronics. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <clk.h> +#include <dm.h> +#include <fdtdec.h> +#include <libfdt.h> +#include <mmc.h> +#include <reset.h> +#include <asm/io.h> +#include <asm/gpio.h> +#include <linux/iopoll.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 GENMASK(1, 0) +#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 GENMASK(21, 20) + +/* 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 + +DECLARE_GLOBAL_DATA_PTR; + +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 Data TimeOut value */ + writel(SDMMC_CMD_TIMEOUT, priv->base + SDMMC_DTIMER); + + /* 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) +{ + if (readl(priv->base + SDMMC_ARG) & SDMMC_CMD_CPSMEN) + writel(0, priv->base + SDMMC_ARG); + + 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; + } + + /* 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, + 300); + + 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); + } + } + + 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; + +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); + + 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__); + + stm32_sdmmc2_start_cmd(priv, &stop_cmd, SDMMC_CMD_CMDSTOP); + 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; +} + +static void stm32_sdmmc2_pwron(struct stm32_sdmmc2_priv *priv) +{ + /* Reset */ + reset_assert(&priv->reset_ctl); + udelay(2); + reset_deassert(&priv->reset_ctl); + + udelay(1000); + + /* Set Power State to ON */ + writel(SDMMC_POWER_PWRCTRL | priv->pwr_reg_msk, priv->base + SDMMC_POWER); + + /* + * 1ms: required power up waiting time before starting the + * SD initialization sequence + */ + udelay(1000); +} + +#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); + struct stm32_sdmmc2_plat *plat = dev_get_platdata(dev); + struct mmc_config *cfg = &plat->cfg; + 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->bus_width == 1) && (desired == cfg->f_min)) + 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, 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 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, +}; + +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,negedge")) + priv->clk_reg_msk |= SDMMC_CLKCR_NEGEDGE; + if (dev_read_bool(dev, "st,dirpol")) + priv->pwr_reg_msk |= SDMMC_POWER_DIRPOL; + + 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; + case 4: + cfg->host_caps |= MMC_MODE_4BIT; + break; + case 1: + break; + default: + error("invalid "bus-width" property, force to 1\n"); + } + + upriv->mmc = &plat->mmc; + + return 0; + +clk_disable: + clk_disable(&priv->clk); +clk_free: + clk_free(&priv->clk); + + return ret; +} + +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), +};