Re: [U-Boot] [PATCH v4 1/1] mmc: Add MMC support for stm32h7 Socs

Hi Patrice.

On 08/11/2017 11:35 PM, patrice.chotard@st.com wrote:

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

---

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 | 601 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 610 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..9ef6b79 --- /dev/null +++ b/drivers/mmc/stm32_sdmmc2.c @@ -0,0 +1,601 @@ +/*

• • 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>

+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 c)
  

"u32 c" is too meaningless naming. i

+{

• if (readl(priv->base + SDMMC_ARG) & SDMMC_CMD_CPSMEN)

• writel(0, priv->base + SDMMC_ARG);
  

• c |= cmd->cmdidx | SDMMC_CMD_CPSMEN;
• if (cmd->resp_type & MMC_RSP_PRESENT) {

• if (cmd->resp_type & MMC_RSP_136)
  

• 	c |= SDMMC_CMD_WAITRESP;
  

• else if (cmd->resp_type & MMC_RSP_CRC)
  

• 	c |= SDMMC_CMD_WAITRESP_0;
  

• else
  

• 	c |= 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(c, 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;
• 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 */
• status = readl(priv->base + SDMMC_STA);
• while (!(status & mask))

• status = readl(priv->base + SDMMC_STA);
  

It's better that use the readl_poll_timeout(). refer to include/linux/iopoll.h

Best Regards, Jaehoon Chung

• /* 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),

+};