diff options
Diffstat (limited to 'drivers/mmc/meson_gx_mmc.c')
| -rw-r--r-- | drivers/mmc/meson_gx_mmc.c | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/drivers/mmc/meson_gx_mmc.c b/drivers/mmc/meson_gx_mmc.c new file mode 100644 index 0000000000..8e28ab70f5 --- /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); + + /* 180 phase core clock */ + meson_mmc_clk |= CLK_CO_PHASE_180; + + /* 180 phase tx clock */ + 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; + + meson_mmc_cmd |= CMD_CFG_DATA_IO | CMD_CFG_BLOCK_MODE | + data->blocks; + } + + meson_mmc_cmd |= CMD_CFG_TIMEOUT_4S | CMD_CFG_OWNER | + CMD_CFG_END_OF_CHAIN; + + 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 { + 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), +}; 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