292 lines
7.0 KiB
C
292 lines
7.0 KiB
C
/*
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* (C) Copyright 2016 Carlo Caione <carlo@caione.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <malloc.h>
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#include <mmc.h>
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#include <asm/io.h>
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#include <asm/arch/sd_emmc.h>
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#include <linux/log2.h>
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static inline void *get_regbase(const struct mmc *mmc)
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{
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struct meson_mmc_platdata *pdata = mmc->priv;
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return pdata->regbase;
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}
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static inline uint32_t meson_read(struct mmc *mmc, int offset)
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{
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return readl(get_regbase(mmc) + offset);
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}
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static inline void meson_write(struct mmc *mmc, uint32_t val, int offset)
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{
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writel(val, get_regbase(mmc) + offset);
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}
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static void meson_mmc_config_clock(struct mmc *mmc)
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{
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uint32_t meson_mmc_clk = 0;
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unsigned int clk, clk_src, clk_div;
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/* 1GHz / CLK_MAX_DIV = 15,9 MHz */
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if (mmc->clock > 16000000) {
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clk = SD_EMMC_CLKSRC_DIV2;
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clk_src = CLK_SRC_DIV2;
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} else {
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clk = SD_EMMC_CLKSRC_24M;
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clk_src = CLK_SRC_24M;
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}
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clk_div = DIV_ROUND_UP(clk, mmc->clock);
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/* 180 phase core clock */
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meson_mmc_clk |= CLK_CO_PHASE_180;
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/* 180 phase tx clock */
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meson_mmc_clk |= CLK_TX_PHASE_000;
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/* clock settings */
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meson_mmc_clk |= clk_src;
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meson_mmc_clk |= clk_div;
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meson_write(mmc, meson_mmc_clk, MESON_SD_EMMC_CLOCK);
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}
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static int meson_dm_mmc_set_ios(struct udevice *dev)
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{
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struct mmc *mmc = mmc_get_mmc_dev(dev);
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uint32_t meson_mmc_cfg;
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meson_mmc_config_clock(mmc);
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meson_mmc_cfg = meson_read(mmc, MESON_SD_EMMC_CFG);
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meson_mmc_cfg &= ~CFG_BUS_WIDTH_MASK;
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if (mmc->bus_width == 1)
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meson_mmc_cfg |= CFG_BUS_WIDTH_1;
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else if (mmc->bus_width == 4)
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meson_mmc_cfg |= CFG_BUS_WIDTH_4;
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else if (mmc->bus_width == 8)
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meson_mmc_cfg |= CFG_BUS_WIDTH_8;
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else
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return -EINVAL;
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/* 512 bytes block length */
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meson_mmc_cfg &= ~CFG_BL_LEN_MASK;
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meson_mmc_cfg |= CFG_BL_LEN_512;
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/* Response timeout 256 clk */
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meson_mmc_cfg &= ~CFG_RESP_TIMEOUT_MASK;
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meson_mmc_cfg |= CFG_RESP_TIMEOUT_256;
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/* Command-command gap 16 clk */
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meson_mmc_cfg &= ~CFG_RC_CC_MASK;
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meson_mmc_cfg |= CFG_RC_CC_16;
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meson_write(mmc, meson_mmc_cfg, MESON_SD_EMMC_CFG);
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return 0;
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}
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static void meson_mmc_setup_cmd(struct mmc *mmc, struct mmc_data *data,
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struct mmc_cmd *cmd)
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{
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uint32_t meson_mmc_cmd = 0, cfg;
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meson_mmc_cmd |= cmd->cmdidx << CMD_CFG_CMD_INDEX_SHIFT;
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if (cmd->resp_type & MMC_RSP_PRESENT) {
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if (cmd->resp_type & MMC_RSP_136)
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meson_mmc_cmd |= CMD_CFG_RESP_128;
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if (cmd->resp_type & MMC_RSP_BUSY)
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meson_mmc_cmd |= CMD_CFG_R1B;
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if (!(cmd->resp_type & MMC_RSP_CRC))
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meson_mmc_cmd |= CMD_CFG_RESP_NOCRC;
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} else {
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meson_mmc_cmd |= CMD_CFG_NO_RESP;
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}
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if (data) {
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cfg = meson_read(mmc, MESON_SD_EMMC_CFG);
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cfg &= ~CFG_BL_LEN_MASK;
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cfg |= ilog2(data->blocksize) << CFG_BL_LEN_SHIFT;
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meson_write(mmc, cfg, MESON_SD_EMMC_CFG);
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if (data->flags == MMC_DATA_WRITE)
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meson_mmc_cmd |= CMD_CFG_DATA_WR;
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meson_mmc_cmd |= CMD_CFG_DATA_IO | CMD_CFG_BLOCK_MODE |
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data->blocks;
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}
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meson_mmc_cmd |= CMD_CFG_TIMEOUT_4S | CMD_CFG_OWNER |
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CMD_CFG_END_OF_CHAIN;
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meson_write(mmc, meson_mmc_cmd, MESON_SD_EMMC_CMD_CFG);
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}
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static void meson_mmc_setup_addr(struct mmc *mmc, struct mmc_data *data)
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{
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struct meson_mmc_platdata *pdata = mmc->priv;
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unsigned int data_size;
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uint32_t data_addr = 0;
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if (data) {
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data_size = data->blocks * data->blocksize;
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if (data->flags == MMC_DATA_READ) {
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data_addr = (ulong) data->dest;
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invalidate_dcache_range(data_addr,
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data_addr + data_size);
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} else {
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pdata->w_buf = calloc(data_size, sizeof(char));
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data_addr = (ulong) pdata->w_buf;
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memcpy(pdata->w_buf, data->src, data_size);
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flush_dcache_range(data_addr, data_addr + data_size);
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}
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}
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meson_write(mmc, data_addr, MESON_SD_EMMC_CMD_DAT);
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}
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static void meson_mmc_read_response(struct mmc *mmc, struct mmc_cmd *cmd)
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{
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if (cmd->resp_type & MMC_RSP_136) {
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cmd->response[0] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP3);
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cmd->response[1] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP2);
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cmd->response[2] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP1);
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cmd->response[3] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP);
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} else {
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cmd->response[0] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP);
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}
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}
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static int meson_dm_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
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struct mmc_data *data)
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{
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struct mmc *mmc = mmc_get_mmc_dev(dev);
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struct meson_mmc_platdata *pdata = mmc->priv;
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uint32_t status;
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ulong start;
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int ret = 0;
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/* max block size supported by chip is 512 byte */
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if (data && data->blocksize > 512)
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return -EINVAL;
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meson_mmc_setup_cmd(mmc, data, cmd);
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meson_mmc_setup_addr(mmc, data);
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meson_write(mmc, cmd->cmdarg, MESON_SD_EMMC_CMD_ARG);
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/* use 10s timeout */
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start = get_timer(0);
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do {
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status = meson_read(mmc, MESON_SD_EMMC_STATUS);
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} while(!(status & STATUS_END_OF_CHAIN) && get_timer(start) < 10000);
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if (!(status & STATUS_END_OF_CHAIN))
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ret = -ETIMEDOUT;
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else if (status & STATUS_RESP_TIMEOUT)
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ret = -ETIMEDOUT;
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else if (status & STATUS_ERR_MASK)
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ret = -EIO;
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meson_mmc_read_response(mmc, cmd);
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if (data && data->flags == MMC_DATA_WRITE)
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free(pdata->w_buf);
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/* reset status bits */
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meson_write(mmc, STATUS_MASK, MESON_SD_EMMC_STATUS);
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return ret;
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}
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static const struct dm_mmc_ops meson_dm_mmc_ops = {
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.send_cmd = meson_dm_mmc_send_cmd,
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.set_ios = meson_dm_mmc_set_ios,
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};
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static int meson_mmc_ofdata_to_platdata(struct udevice *dev)
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{
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struct meson_mmc_platdata *pdata = dev_get_platdata(dev);
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fdt_addr_t addr;
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addr = devfdt_get_addr(dev);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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pdata->regbase = (void *)addr;
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return 0;
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}
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static int meson_mmc_probe(struct udevice *dev)
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{
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struct meson_mmc_platdata *pdata = dev_get_platdata(dev);
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struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
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struct mmc *mmc = &pdata->mmc;
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struct mmc_config *cfg = &pdata->cfg;
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uint32_t val;
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cfg->voltages = MMC_VDD_33_34 | MMC_VDD_32_33 |
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MMC_VDD_31_32 | MMC_VDD_165_195;
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cfg->host_caps = MMC_MODE_8BIT | MMC_MODE_4BIT |
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MMC_MODE_HS_52MHz | MMC_MODE_HS;
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cfg->f_min = DIV_ROUND_UP(SD_EMMC_CLKSRC_24M, CLK_MAX_DIV);
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cfg->f_max = 100000000; /* 100 MHz */
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cfg->b_max = 511; /* max 512 - 1 blocks */
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cfg->name = dev->name;
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mmc->priv = pdata;
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upriv->mmc = mmc;
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mmc_set_clock(mmc, cfg->f_min, false);
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/* reset all status bits */
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meson_write(mmc, STATUS_MASK, MESON_SD_EMMC_STATUS);
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/* disable interrupts */
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meson_write(mmc, 0, MESON_SD_EMMC_IRQ_EN);
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/* enable auto clock mode */
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val = meson_read(mmc, MESON_SD_EMMC_CFG);
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val &= ~CFG_SDCLK_ALWAYS_ON;
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val |= CFG_AUTO_CLK;
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meson_write(mmc, val, MESON_SD_EMMC_CFG);
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return 0;
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}
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int meson_mmc_bind(struct udevice *dev)
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{
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struct meson_mmc_platdata *pdata = dev_get_platdata(dev);
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return mmc_bind(dev, &pdata->mmc, &pdata->cfg);
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}
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static const struct udevice_id meson_mmc_match[] = {
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{ .compatible = "amlogic,meson-gx-mmc" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(meson_mmc) = {
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.name = "meson_gx_mmc",
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.id = UCLASS_MMC,
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.of_match = meson_mmc_match,
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.ops = &meson_dm_mmc_ops,
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.probe = meson_mmc_probe,
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.bind = meson_mmc_bind,
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.ofdata_to_platdata = meson_mmc_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct meson_mmc_platdata),
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};
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