This driver implements MMC support on Meson GX (S905) based systems. It's based on Carlo Caione's work, changes: - BLK support added - general refactoring

Signed-off-by: Carlo Caione carlo@caione.org Signed-off-by: Andreas Färber afaerber@suse.de Signed-off-by: Heiner Kallweit hkallweit1@gmail.com --- v4: - addressed review comments - general refactoring - remove config symbol MMC_MESON_GX_SD_PORT - changed From: to Carlo Caione - changed copyright year to 2016 --- arch/arm/include/asm/arch-meson/sd_emmc.h | 89 +++++++++ drivers/mmc/Kconfig | 6 + drivers/mmc/Makefile | 1 + drivers/mmc/meson_gx_mmc.c | 291 ++++++++++++++++++++++++++++++ 4 files changed, 387 insertions(+) create mode 100644 arch/arm/include/asm/arch-meson/sd_emmc.h create mode 100644 drivers/mmc/meson_gx_mmc.c

diff --git a/arch/arm/include/asm/arch-meson/sd_emmc.h b/arch/arm/include/asm/arch-meson/sd_emmc.h new file mode 100644 index 0000000..a09e034 --- /dev/null +++ b/arch/arm/include/asm/arch-meson/sd_emmc.h @@ -0,0 +1,89 @@ +/* + * (C) Copyright 2016 Carlo Caione carlo@caione.org + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __SD_EMMC_H__ +#define __SD_EMMC_H__ + +#include <mmc.h> + +#define SDIO_PORT_A 0 +#define SDIO_PORT_B 1 +#define SDIO_PORT_C 2 + +#define SD_EMMC_CLKSRC_24M 24000000 /* 24 MHz */ +#define SD_EMMC_CLKSRC_DIV2 1000000000 /* 1 GHz */ + +#define MESON_SD_EMMC_CLOCK 0x00 +#define CLK_MAX_DIV 63 +#define CLK_SRC_24M (0 << 6) +#define CLK_SRC_DIV2 (1 << 6) +#define CLK_CO_PHASE_000 (0 << 8) +#define CLK_CO_PHASE_090 (1 << 8) +#define CLK_CO_PHASE_180 (2 << 8) +#define CLK_CO_PHASE_270 (3 << 8) +#define CLK_TX_PHASE_000 (0 << 10) +#define CLK_TX_PHASE_090 (1 << 10) +#define CLK_TX_PHASE_180 (2 << 10) +#define CLK_TX_PHASE_270 (3 << 10) +#define CLK_ALWAYS_ON BIT(24) + +#define MESON_SD_EMMC_CFG 0x44 +#define CFG_BUS_WIDTH_MASK GENMASK(1, 0) +#define CFG_BUS_WIDTH_1 0 +#define CFG_BUS_WIDTH_4 1 +#define CFG_BUS_WIDTH_8 2 +#define CFG_BL_LEN_MASK GENMASK(7, 4) +#define CFG_BL_LEN_SHIFT 4 +#define CFG_BL_LEN_512 (9 << 4) +#define CFG_RESP_TIMEOUT_MASK GENMASK(11, 8) +#define CFG_RESP_TIMEOUT_256 (8 << 8) +#define CFG_RC_CC_MASK GENMASK(15, 12) +#define CFG_RC_CC_16 (4 << 12) +#define CFG_SDCLK_ALWAYS_ON BIT(18) +#define CFG_AUTO_CLK BIT(23) + +#define MESON_SD_EMMC_STATUS 0x48 +#define STATUS_MASK GENMASK(15, 0) +#define STATUS_ERR_MASK GENMASK(12, 0) +#define STATUS_RXD_ERR_MASK GENMASK(7, 0) +#define STATUS_TXD_ERR BIT(8) +#define STATUS_DESC_ERR BIT(9) +#define STATUS_RESP_ERR BIT(10) +#define STATUS_RESP_TIMEOUT BIT(11) +#define STATUS_DESC_TIMEOUT BIT(12) +#define STATUS_END_OF_CHAIN BIT(13) + +#define MESON_SD_EMMC_IRQ_EN 0x4c + +#define MESON_SD_EMMC_CMD_CFG 0x50 +#define CMD_CFG_LENGTH_MASK GENMASK(8, 0) +#define CMD_CFG_BLOCK_MODE BIT(9) +#define CMD_CFG_R1B BIT(10) +#define CMD_CFG_END_OF_CHAIN BIT(11) +#define CMD_CFG_TIMEOUT_4S (12 << 12) +#define CMD_CFG_NO_RESP BIT(16) +#define CMD_CFG_DATA_IO BIT(18) +#define CMD_CFG_DATA_WR BIT(19) +#define CMD_CFG_RESP_NOCRC BIT(20) +#define CMD_CFG_RESP_128 BIT(21) +#define CMD_CFG_CMD_INDEX_SHIFT 24 +#define CMD_CFG_OWNER BIT(31) + +#define MESON_SD_EMMC_CMD_ARG 0x54 +#define MESON_SD_EMMC_CMD_DAT 0x58 +#define MESON_SD_EMMC_CMD_RSP 0x5c +#define MESON_SD_EMMC_CMD_RSP1 0x60 +#define MESON_SD_EMMC_CMD_RSP2 0x64 +#define MESON_SD_EMMC_CMD_RSP3 0x68 + +struct meson_mmc_platdata { + struct mmc_config cfg; + struct mmc mmc; + void *regbase; + void *w_buf; +}; + +#endif diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index df4913b..bc647c8 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -172,6 +172,12 @@ config ZYNQ_SDHCI help Support for Arasan SDHCI host controller on Zynq/ZynqMP ARM SoCs platform

+config MMC_MESON_GX + bool "Meson GX EMMC controller support" + depends on DM_MMC && BLK && DM_MMC_OPS && ARCH_MESON + help + Support for EMMC host controller on Meson GX ARM SoCs platform (S905) + config ROCKCHIP_SDHCI bool "Arasan SDHCI controller for Rockchip support" depends on DM_MMC && BLK && DM_MMC_OPS diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile index 6af7f79..baa6531 100644 --- a/drivers/mmc/Makefile +++ b/drivers/mmc/Makefile @@ -31,6 +31,7 @@ ifdef CONFIG_SUPPORT_EMMC_BOOT obj-$(CONFIG_GENERIC_MMC) += mmc_boot.o endif obj-$(CONFIG_GENERIC_ATMEL_MCI) += gen_atmel_mci.o +obj-$(CONFIG_MMC_MESON_GX) += meson_gx_mmc.o obj-$(CONFIG_MMC_SPI) += mmc_spi.o obj-$(CONFIG_MVEBU_MMC) += mvebu_mmc.o obj-$(CONFIG_MMC_OMAP_HS) += omap_hsmmc.o diff --git a/drivers/mmc/meson_gx_mmc.c b/drivers/mmc/meson_gx_mmc.c new file mode 100644 index 0000000..12d2047 --- /dev/null +++ b/drivers/mmc/meson_gx_mmc.c @@ -0,0 +1,291 @@ +/* + * (C) Copyright 2016 Carlo Caione carlo@caione.org + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <fdtdec.h> +#include <malloc.h> +#include <mmc.h> +#include <asm/io.h> +#include <asm/arch/sd_emmc.h> +#include <dm/device.h> +#include <linux/log2.h> + +static inline void *get_regbase(const struct mmc *mmc) +{ + struct meson_mmc_platdata *pdata = mmc->priv; + + return pdata->regbase; +} + +static inline uint32_t meson_read(struct mmc *mmc, int offset) +{ + return readl(get_regbase(mmc) + offset); +} + +static inline void meson_write(struct mmc *mmc, uint32_t val, int offset) +{ + writel(val, get_regbase(mmc) + offset); +} + +static void meson_mmc_config_clock(struct mmc *mmc) +{ + uint32_t meson_mmc_clk = 0; + unsigned int clk, clk_src, clk_div; + + /* 1GHz / CLK_MAX_DIV = 15,9 MHz */ + if (mmc->clock > 16000000) { + clk = SD_EMMC_CLKSRC_DIV2; + clk_src = CLK_SRC_DIV2; + } else { + clk = SD_EMMC_CLKSRC_24M; + clk_src = CLK_SRC_24M; + } + clk_div = DIV_ROUND_UP(clk, mmc->clock); + + /* core clock phase */ + meson_mmc_clk |= CLK_CO_PHASE_180; + + /* tx clock phase */ + meson_mmc_clk |= CLK_TX_PHASE_000; + + /* clock settings */ + meson_mmc_clk |= clk_src; + meson_mmc_clk |= clk_div; + + meson_write(mmc, meson_mmc_clk, MESON_SD_EMMC_CLOCK); +} + +static int meson_dm_mmc_set_ios(struct udevice *dev) +{ + struct mmc *mmc = mmc_get_mmc_dev(dev); + uint32_t meson_mmc_cfg; + + meson_mmc_config_clock(mmc); + + meson_mmc_cfg = meson_read(mmc, MESON_SD_EMMC_CFG); + + meson_mmc_cfg &= ~CFG_BUS_WIDTH_MASK; + if (mmc->bus_width == 1) + meson_mmc_cfg |= CFG_BUS_WIDTH_1; + else if (mmc->bus_width == 4) + meson_mmc_cfg |= CFG_BUS_WIDTH_4; + else if (mmc->bus_width == 8) + meson_mmc_cfg |= CFG_BUS_WIDTH_8; + else + return -EINVAL; + + /* 512 bytes block length */ + meson_mmc_cfg &= ~CFG_BL_LEN_MASK; + meson_mmc_cfg |= CFG_BL_LEN_512; + + /* Response timeout 256 clk */ + meson_mmc_cfg &= ~CFG_RESP_TIMEOUT_MASK; + meson_mmc_cfg |= CFG_RESP_TIMEOUT_256; + + /* Command-command gap 16 clk */ + meson_mmc_cfg &= ~CFG_RC_CC_MASK; + meson_mmc_cfg |= CFG_RC_CC_16; + + meson_write(mmc, meson_mmc_cfg, MESON_SD_EMMC_CFG); + + return 0; +} + +static void meson_mmc_setup_cmd(struct mmc *mmc, struct mmc_data *data, + struct mmc_cmd *cmd) +{ + uint32_t meson_mmc_cmd = 0, cfg; + + meson_mmc_cmd |= cmd->cmdidx << CMD_CFG_CMD_INDEX_SHIFT; + + if (cmd->resp_type & MMC_RSP_PRESENT) { + if (cmd->resp_type & MMC_RSP_136) + meson_mmc_cmd |= CMD_CFG_RESP_128; + + if (cmd->resp_type & MMC_RSP_BUSY) + meson_mmc_cmd |= CMD_CFG_R1B; + + if (!(cmd->resp_type & MMC_RSP_CRC)) + meson_mmc_cmd |= CMD_CFG_RESP_NOCRC; + } else { + meson_mmc_cmd |= CMD_CFG_NO_RESP; + } + + if (data) { + cfg = meson_read(mmc, MESON_SD_EMMC_CFG); + cfg &= ~CFG_BL_LEN_MASK; + cfg |= ilog2(data->blocksize) << CFG_BL_LEN_SHIFT; + meson_write(mmc, cfg, MESON_SD_EMMC_CFG); + + if (data->flags == MMC_DATA_WRITE) + meson_mmc_cmd |= CMD_CFG_DATA_WR; + + cfg = CMD_CFG_DATA_IO | CMD_CFG_BLOCK_MODE | data->blocks; + meson_mmc_cmd |= cfg; + } + + cfg = CMD_CFG_TIMEOUT_4S | CMD_CFG_OWNER | CMD_CFG_END_OF_CHAIN; + meson_mmc_cmd |= cfg; + + meson_write(mmc, meson_mmc_cmd, MESON_SD_EMMC_CMD_CFG); +} + +static void meson_mmc_setup_addr(struct mmc *mmc, struct mmc_data *data) +{ + struct meson_mmc_platdata *pdata = mmc->priv; + unsigned int data_size; + uint32_t data_addr = 0; + + if (data) { + data_size = data->blocks * data->blocksize; + + if (data->flags == MMC_DATA_READ) { + data_addr = (ulong) data->dest; + invalidate_dcache_range(data_addr, + data_addr + data_size); + } else if (data->flags == MMC_DATA_WRITE) { + pdata->w_buf = calloc(data_size, sizeof(char)); + data_addr = (ulong) pdata->w_buf; + memcpy(pdata->w_buf, data->src, data_size); + flush_dcache_range(data_addr, data_addr + data_size); + } + } + + meson_write(mmc, data_addr, MESON_SD_EMMC_CMD_DAT); +} + +static void meson_mmc_read_response(struct mmc *mmc, struct mmc_cmd *cmd) +{ + if (cmd->resp_type & MMC_RSP_136) { + cmd->response[0] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP3); + cmd->response[1] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP2); + cmd->response[2] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP1); + cmd->response[3] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP); + } else { + cmd->response[0] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP); + } +} + +static int meson_dm_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd, + struct mmc_data *data) +{ + struct mmc *mmc = mmc_get_mmc_dev(dev); + struct meson_mmc_platdata *pdata = mmc->priv; + uint32_t status; + ulong start; + int ret = 0; + + /* max block size supported by chip is 512 byte */ + if (data && data->blocksize > 512) + return -EINVAL; + + meson_mmc_setup_cmd(mmc, data, cmd); + meson_mmc_setup_addr(mmc, data); + + meson_write(mmc, cmd->cmdarg, MESON_SD_EMMC_CMD_ARG); + + /* use 10s timeout */ + start = get_timer(0); + do { + status = meson_read(mmc, MESON_SD_EMMC_STATUS); + } while(!(status & STATUS_END_OF_CHAIN) && get_timer(start) < 10000); + + if (!(status & STATUS_END_OF_CHAIN)) + ret = -ETIMEDOUT; + else if (status & STATUS_RESP_TIMEOUT) + ret = -ETIMEDOUT; + else if (status & STATUS_ERR_MASK) + ret = -EIO; + + meson_mmc_read_response(mmc, cmd); + + if (data && data->flags == MMC_DATA_WRITE) + free(pdata->w_buf); + + /* reset status bits */ + meson_write(mmc, STATUS_MASK, MESON_SD_EMMC_STATUS); + + return ret; +} + +static const struct dm_mmc_ops meson_dm_mmc_ops = { + .send_cmd = meson_dm_mmc_send_cmd, + .set_ios = meson_dm_mmc_set_ios, +}; + +static int meson_mmc_ofdata_to_platdata(struct udevice *dev) +{ + struct meson_mmc_platdata *pdata = dev_get_platdata(dev); + fdt_addr_t addr; + + addr = dev_get_addr(dev); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + pdata->regbase = (void *)addr; + + return 0; +} + +static int meson_mmc_probe(struct udevice *dev) +{ + struct meson_mmc_platdata *pdata = dev_get_platdata(dev); + struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev); + struct mmc *mmc = &pdata->mmc; + struct mmc_config *cfg = &pdata->cfg; + uint32_t val; + + cfg->voltages = MMC_VDD_33_34 | MMC_VDD_32_33 | + MMC_VDD_31_32 | MMC_VDD_165_195; + cfg->host_caps = MMC_MODE_8BIT | MMC_MODE_4BIT | + MMC_MODE_HS_52MHz | MMC_MODE_HS; + cfg->f_min = DIV_ROUND_UP(SD_EMMC_CLKSRC_24M, CLK_MAX_DIV); + cfg->f_max = 100000000; /* 100 MHz */ + cfg->b_max = 256; /* max 256 blocks */ + cfg->name = dev->name; + + mmc->priv = pdata; + upriv->mmc = mmc; + + mmc_set_clock(mmc, cfg->f_min); + + /* reset all status bits */ + meson_write(mmc, STATUS_MASK, MESON_SD_EMMC_STATUS); + + /* disable interrupts */ + meson_write(mmc, 0, MESON_SD_EMMC_IRQ_EN); + + /* enable auto clock mode */ + val = meson_read(mmc, MESON_SD_EMMC_CFG); + val &= ~CFG_SDCLK_ALWAYS_ON; + val |= CFG_AUTO_CLK; + meson_write(mmc, val, MESON_SD_EMMC_CFG); + + return 0; +} + +int meson_mmc_bind(struct udevice *dev) +{ + struct meson_mmc_platdata *pdata = dev_get_platdata(dev); + + return mmc_bind(dev, &pdata->mmc, &pdata->cfg); +} + +static const struct udevice_id meson_mmc_match[] = { + { .compatible = "amlogic,meson-gx-mmc" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(meson_mmc) = { + .name = "meson_gx_mmc", + .id = UCLASS_MMC, + .of_match = meson_mmc_match, + .ops = &meson_dm_mmc_ops, + .probe = meson_mmc_probe, + .bind = meson_mmc_bind, + .ofdata_to_platdata = meson_mmc_ofdata_to_platdata, + .platdata_auto_alloc_size = sizeof(struct meson_mmc_platdata), +};