[PATCH v4 1/1] mmc: Add MMC support for stm32h7 Socs

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[PATCH v4 1/1] mmc: Add MMC support for stm32h7 Socs

Patrice CHOTARD
From: Patrice Chotard <[hidden email]>

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 <[hidden email]>
Signed-off-by: Patrice Chotard <[hidden email]>
---
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, <[hidden email]> 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)
+{
+ 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);
+
+ /* 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),
+};
--
1.9.1

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

Simon Glass-3
On 11 August 2017 at 08:35,  <[hidden email]> wrote:

> From: Patrice Chotard <[hidden email]>
>
> 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 <[hidden email]>
> Signed-off-by: Patrice Chotard <[hidden email]>
> ---
> 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

Reviewed-by: Simon Glass <[hidden email]>
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Re: [PATCH v4 1/1] mmc: Add MMC support for stm32h7 Socs

Jaehoon Chung
In reply to this post by Patrice CHOTARD
Hi Patrice.

On 08/11/2017 11:35 PM, [hidden email] wrote:

> From: Patrice Chotard <[hidden email]>
>
> 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 <[hidden email]>
> Signed-off-by: Patrice Chotard <[hidden email]>
> ---
> 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, <[hidden email]> 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),
> +};
>

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