This driver was ported from u-boot v2019.10. Instead of devicetree compatible it is using ARM AMBA id. So, there is no need to patch devicetree with different compatible as it was implemented in u-boot.
Signed-off-by: Oleksij Rempel <[email protected]> --- drivers/mci/Kconfig | 8 + drivers/mci/Makefile | 1 + drivers/mci/stm32_sdmmc2.c | 680 +++++++++++++++++++++++++++++++++++++ 3 files changed, 689 insertions(+) create mode 100644 drivers/mci/stm32_sdmmc2.c diff --git a/drivers/mci/Kconfig b/drivers/mci/Kconfig index 08c8c84e8c..5b56031013 100644 --- a/drivers/mci/Kconfig +++ b/drivers/mci/Kconfig @@ -153,4 +153,12 @@ config MMC_SPI_CRC_ON help Enable CRC protection for transfers +config MCI_STM32_SDMMC2 + bool "STMicroelectronics STM32H7 SD/MMC Host Controller support" + depends on ARM_AMBA + 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 diff --git a/drivers/mci/Makefile b/drivers/mci/Makefile index 25a1d073dc..04c1287fee 100644 --- a/drivers/mci/Makefile +++ b/drivers/mci/Makefile @@ -14,3 +14,4 @@ obj-$(CONFIG_MCI_TEGRA) += tegra-sdmmc.o obj-$(CONFIG_MCI_SPI) += mci_spi.o obj-$(CONFIG_MCI_DW) += dw_mmc.o obj-$(CONFIG_MCI_MMCI) += mmci.o +obj-$(CONFIG_MCI_STM32_SDMMC2) += stm32_sdmmc2.o diff --git a/drivers/mci/stm32_sdmmc2.c b/drivers/mci/stm32_sdmmc2.c new file mode 100644 index 0000000000..4fb3cbc6a5 --- /dev/null +++ b/drivers/mci/stm32_sdmmc2.c @@ -0,0 +1,680 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2017, STMicroelectronics - All Rights Reserved + * Author(s): Patrice Chotard, <[email protected]> for STMicroelectronics. + */ + +#include <common.h> +#include <dma.h> +#include <init.h> +#include <linux/amba/bus.h> +#include <linux/iopoll.h> +#include <linux/log2.h> +#include <linux/reset.h> +#include <mci.h> + +#define DRIVER_NAME "stm32_sdmmc" + +/* 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 + +#define IS_RISING_EDGE(reg) ((reg) & SDMMC_CLKCR_NEGEDGE ? 0 : 1) + +struct stm32_sdmmc2_priv { + void __iomem *base; + struct mci_host mci; + struct device_d *dev; + struct clk *clk; + struct reset_control *reset_ctl; + u32 clk_reg_msk; + u32 pwr_reg_msk; +}; + +struct stm32_sdmmc2_ctx { + u32 cache_start; + u32 cache_end; + u32 data_length; + bool dpsm_abort; +}; + +#define to_mci_host(mci) container_of(mci, struct stm32_sdmmc2_priv, mci) + +static void stm32_sdmmc2_start_data(struct stm32_sdmmc2_priv *priv, + struct mci_data *data, + struct stm32_sdmmc2_ctx *ctx) +{ + unsigned int num_bytes = data->blocks * data->blocksize; + u32 data_ctrl, idmabase0; + + /* Configure the SDMMC DPSM (Data Path State Machine) */ + data_ctrl = (__ilog2_u32(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); + + if (data->flags & MMC_DATA_WRITE) + dma_sync_single_for_device((unsigned long)idmabase0, + num_bytes, DMA_TO_DEVICE); + else + dma_sync_single_for_device((unsigned long)idmabase0, + num_bytes, DMA_FROM_DEVICE); + + /* 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 mci_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 mci_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, + 1000000); + + if (ret < 0) { + dev_err(priv->dev, "%s: timeout reading SDMMC_STA register\n", + __func__); + ctx->dpsm_abort = true; + return ret; + } + + /* Check status */ + if (status & SDMMC_STA_CTIMEOUT) { + dev_err(priv->dev, "%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) { + dev_err(priv->dev, "%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) { + dev_err(priv->dev, "%s: timeout reading SDMMC_STA\n", + __func__); + ctx->dpsm_abort = true; + return ret; + } + + if (status & SDMMC_STA_DTIMEOUT) { + dev_err(priv->dev, "%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 mci_cmd *cmd, + struct mci_data *data, + struct stm32_sdmmc2_ctx *ctx) +{ + u32 mask = SDMMC_STA_DCRCFAIL | SDMMC_STA_DTIMEOUT | + SDMMC_STA_IDMATE | SDMMC_STA_DATAEND; + unsigned int num_bytes = data->blocks * data->blocksize; + 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); + + if (data->flags & MMC_DATA_WRITE) + dma_sync_single_for_cpu((unsigned long)data->src, + num_bytes, DMA_TO_DEVICE); + else + dma_sync_single_for_cpu((unsigned long)data->dest, + num_bytes, DMA_FROM_DEVICE); + + if (status & SDMMC_STA_DCRCFAIL) { + dev_err(priv->dev, "%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) { + dev_err(priv->dev, "%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) { + dev_err(priv->dev, "%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) { + dev_err(priv->dev, "%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) { + dev_err(priv->dev, "%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 mci_host *mci, struct mci_cmd *cmd, + struct mci_data *data) +{ + struct stm32_sdmmc2_priv *priv = to_mci_host(mci); + 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, &ctx); + + dev_dbg(priv->dev, "%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 mci_cmd stop_cmd; + + stop_cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION; + stop_cmd.cmdarg = 0; + stop_cmd.resp_type = MMC_RSP_R1b; + + dev_dbg(priv->dev, "%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) { + dev_warn(priv->dev, "%s: cmd %d failed, retrying ...\n", + __func__, cmd->cmdidx); + retry--; + goto retry_cmd; + } + + dev_dbg(priv->dev, "%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 int stm32_sdmmc2_reset(struct mci_host *mci, struct device_d *mci_dev) +{ + struct stm32_sdmmc2_priv *priv = to_mci_host(mci); + + reset_control_assert(priv->reset_ctl); + udelay(2); + reset_control_deassert(priv->reset_ctl); + + /* init the needed SDMMC register after reset */ + writel(priv->pwr_reg_msk, priv->base + SDMMC_POWER); + + return 0; +} + +/* + * 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->mci, priv->dev); + writel(SDMMC_POWER_PWRCTRL_CYCLE | priv->pwr_reg_msk, + priv->base + SDMMC_POWER); +} + +/* + * 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. */ +} + +static void stm32_sdmmc2_set_ios(struct mci_host *mci, struct mci_ios *ios) +{ + struct stm32_sdmmc2_priv *priv = to_mci_host(mci); + u32 desired = mci->clock; + u32 sys_clock = clk_get_rate(priv->clk); + u32 clk = 0; + + dev_dbg(priv->dev, "%s: bus_with = %d, clock = %d\n", __func__, + mci->bus_width, mci->clock); + + if (mci->clock) + stm32_sdmmc2_pwron(priv); + else + stm32_sdmmc2_pwrcycle(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 (mci->bus_width == 4) + clk |= SDMMC_CLKCR_WIDBUS_4; + if (mci->bus_width == 8) + clk |= SDMMC_CLKCR_WIDBUS_8; + + writel(clk | priv->clk_reg_msk | SDMMC_CLKCR_HWFC_EN, + priv->base + SDMMC_CLKCR); +} + +static int stm32_sdmmc2_probe(struct amba_device *adev, + const struct amba_id *id) +{ + struct device_d *dev = &adev->dev; + struct device_node *np = dev->device_node; + struct stm32_sdmmc2_priv *priv; + struct mci_host *mci; + int ret; + + priv = xzalloc(sizeof(*priv)); + + priv->base = amba_get_mem_region(adev); + priv->dev = dev; + + mci = &priv->mci; + mci->send_cmd = stm32_sdmmc2_send_cmd, + mci->set_ios = stm32_sdmmc2_set_ios, + mci->init = stm32_sdmmc2_reset; + mci->hw_dev = dev; + + priv->clk = clk_get(dev, NULL); + if (IS_ERR(priv->clk)) { + ret = PTR_ERR(priv->clk); + goto priv_free; + } + + ret = clk_enable(priv->clk); + if (ret) + goto priv_free; + + if (of_get_property(np, "st,neg-edge", NULL)) + priv->clk_reg_msk |= SDMMC_CLKCR_NEGEDGE; + if (of_get_property(np, "st,sig-dir", NULL)) + priv->pwr_reg_msk |= SDMMC_POWER_DIRPOL; + if (of_get_property(np, "st,use-ckin", NULL)) + priv->clk_reg_msk |= SDMMC_CLKCR_SELCLKRX_CKIN; + + priv->reset_ctl = reset_control_get(dev, NULL); + if (IS_ERR(priv->reset_ctl)) + priv->reset_ctl = NULL; + + mci->f_min = 400000; + /* f_max is taken from kernel v5.3 variant_stm32_sdmmc */ + mci->f_max = 208000000; + mci->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195; + + return mci_register(&priv->mci); + +priv_free: + free(priv); + + return ret; +} + +static struct amba_id stm32_sdmmc2_ids[] = { + /* ST Micro STM32MP157C */ + { + .id = 0x10153180, + .mask = 0xf0ffffff, + }, + { 0, 0 }, +}; + +static struct amba_driver stm32_sdmmc2_driver = { + .drv = { + .name = DRIVER_NAME, + }, + .probe = stm32_sdmmc2_probe, + .id_table = stm32_sdmmc2_ids, +}; + +static int stm32_sdmmc2_init(void) +{ + amba_driver_register(&stm32_sdmmc2_driver); + return 0; +} +device_initcall(stm32_sdmmc2_init); -- 2.23.0 _______________________________________________ barebox mailing list [email protected] http://lists.infradead.org/mailman/listinfo/barebox
