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u-boot/drivers/mmc/meson_gx_mmc.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2016 Carlo Caione <carlo@caione.org>
*/
#include <common.h>
#include <dm.h>
#include <fdtdec.h>
#include <malloc.h>
#include <mmc.h>
#include <asm/io.h>
#include <asm/arch/sd_emmc.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;
if (!mmc->clock)
return;
/* 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 = devfdt_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 = 511; /* max 512 - 1 blocks */
cfg->name = dev->name;
mmc->priv = pdata;
upriv->mmc = mmc;
mmc_set_clock(mmc, cfg->f_min, false);
/* 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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