2023-02-15 19:32:47 +08:00
|
|
|
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
/*
|
|
|
|
* StarFive Designware Mobile Storage Host Controller Driver
|
|
|
|
*
|
|
|
|
* Copyright (c) 2022 StarFive Technology Co., Ltd.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/clk.h>
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/mfd/syscon.h>
|
|
|
|
#include <linux/mmc/host.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/of_address.h>
|
|
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/regmap.h>
|
|
|
|
|
|
|
|
#include "dw_mmc.h"
|
|
|
|
#include "dw_mmc-pltfm.h"
|
|
|
|
|
|
|
|
#define ALL_INT_CLR 0x1ffff
|
|
|
|
#define MAX_DELAY_CHAIN 32
|
|
|
|
|
|
|
|
struct starfive_priv {
|
|
|
|
struct device *dev;
|
|
|
|
struct regmap *reg_syscon;
|
|
|
|
u32 syscon_offset;
|
|
|
|
u32 syscon_shift;
|
|
|
|
u32 syscon_mask;
|
|
|
|
};
|
|
|
|
|
|
|
|
static void dw_mci_starfive_set_ios(struct dw_mci *host, struct mmc_ios *ios)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
unsigned int clock;
|
|
|
|
|
|
|
|
if (ios->timing == MMC_TIMING_MMC_DDR52 || ios->timing == MMC_TIMING_UHS_DDR50) {
|
|
|
|
clock = (ios->clock > 50000000 && ios->clock <= 52000000) ? 100000000 : ios->clock;
|
|
|
|
ret = clk_set_rate(host->ciu_clk, clock);
|
|
|
|
if (ret)
|
|
|
|
dev_dbg(host->dev, "Use an external frequency divider %uHz\n", ios->clock);
|
|
|
|
host->bus_hz = clk_get_rate(host->ciu_clk);
|
|
|
|
} else {
|
|
|
|
dev_dbg(host->dev, "Using the internal divider\n");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int dw_mci_starfive_execute_tuning(struct dw_mci_slot *slot,
|
|
|
|
u32 opcode)
|
|
|
|
{
|
|
|
|
static const int grade = MAX_DELAY_CHAIN;
|
|
|
|
struct dw_mci *host = slot->host;
|
|
|
|
struct starfive_priv *priv = host->priv;
|
|
|
|
int rise_point = -1, fall_point = -1;
|
2023-03-07 10:46:46 +08:00
|
|
|
int err, prev_err = 0;
|
2023-02-15 19:32:47 +08:00
|
|
|
int i;
|
|
|
|
bool found = 0;
|
|
|
|
u32 regval;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Use grade as the max delay chain, and use the rise_point and
|
|
|
|
* fall_point to ensure the best sampling point of a data input
|
|
|
|
* signals.
|
|
|
|
*/
|
|
|
|
for (i = 0; i < grade; i++) {
|
|
|
|
regval = i << priv->syscon_shift;
|
|
|
|
err = regmap_update_bits(priv->reg_syscon, priv->syscon_offset,
|
|
|
|
priv->syscon_mask, regval);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
mci_writel(host, RINTSTS, ALL_INT_CLR);
|
|
|
|
|
|
|
|
err = mmc_send_tuning(slot->mmc, opcode, NULL);
|
|
|
|
if (!err)
|
|
|
|
found = 1;
|
|
|
|
|
|
|
|
if (i > 0) {
|
|
|
|
if (err && !prev_err)
|
|
|
|
fall_point = i - 1;
|
|
|
|
if (!err && prev_err)
|
|
|
|
rise_point = i;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (rise_point != -1 && fall_point != -1)
|
|
|
|
goto tuning_out;
|
|
|
|
|
|
|
|
prev_err = err;
|
|
|
|
err = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
tuning_out:
|
|
|
|
if (found) {
|
|
|
|
if (rise_point == -1)
|
|
|
|
rise_point = 0;
|
|
|
|
if (fall_point == -1)
|
|
|
|
fall_point = grade - 1;
|
|
|
|
if (fall_point < rise_point) {
|
|
|
|
if ((rise_point + fall_point) >
|
|
|
|
(grade - 1))
|
|
|
|
i = fall_point / 2;
|
|
|
|
else
|
|
|
|
i = (rise_point + grade - 1) / 2;
|
|
|
|
} else {
|
|
|
|
i = (rise_point + fall_point) / 2;
|
|
|
|
}
|
|
|
|
|
|
|
|
regval = i << priv->syscon_shift;
|
|
|
|
err = regmap_update_bits(priv->reg_syscon, priv->syscon_offset,
|
|
|
|
priv->syscon_mask, regval);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
mci_writel(host, RINTSTS, ALL_INT_CLR);
|
|
|
|
|
|
|
|
dev_info(host->dev, "Found valid delay chain! use it [delay=%d]\n", i);
|
|
|
|
} else {
|
|
|
|
dev_err(host->dev, "No valid delay chain! use default\n");
|
|
|
|
err = -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
mci_writel(host, RINTSTS, ALL_INT_CLR);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int dw_mci_starfive_parse_dt(struct dw_mci *host)
|
|
|
|
{
|
|
|
|
struct of_phandle_args args;
|
|
|
|
struct starfive_priv *priv;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
|
|
|
|
if (!priv)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
ret = of_parse_phandle_with_fixed_args(host->dev->of_node,
|
|
|
|
"starfive,sysreg", 3, 0, &args);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(host->dev, "Failed to parse starfive,sysreg\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
priv->reg_syscon = syscon_node_to_regmap(args.np);
|
|
|
|
of_node_put(args.np);
|
|
|
|
if (IS_ERR(priv->reg_syscon))
|
|
|
|
return PTR_ERR(priv->reg_syscon);
|
|
|
|
|
|
|
|
priv->syscon_offset = args.args[0];
|
|
|
|
priv->syscon_shift = args.args[1];
|
|
|
|
priv->syscon_mask = args.args[2];
|
|
|
|
|
|
|
|
host->priv = priv;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct dw_mci_drv_data starfive_data = {
|
|
|
|
.common_caps = MMC_CAP_CMD23,
|
|
|
|
.set_ios = dw_mci_starfive_set_ios,
|
|
|
|
.parse_dt = dw_mci_starfive_parse_dt,
|
|
|
|
.execute_tuning = dw_mci_starfive_execute_tuning,
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct of_device_id dw_mci_starfive_match[] = {
|
|
|
|
{ .compatible = "starfive,jh7110-mmc",
|
|
|
|
.data = &starfive_data },
|
|
|
|
{},
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, dw_mci_starfive_match);
|
|
|
|
|
|
|
|
static int dw_mci_starfive_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
return dw_mci_pltfm_register(pdev, &starfive_data);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct platform_driver dw_mci_starfive_driver = {
|
|
|
|
.probe = dw_mci_starfive_probe,
|
|
|
|
.remove = dw_mci_pltfm_remove,
|
|
|
|
.driver = {
|
|
|
|
.name = "dwmmc_starfive",
|
|
|
|
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
|
|
|
|
.of_match_table = dw_mci_starfive_match,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
module_platform_driver(dw_mci_starfive_driver);
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("StarFive JH7110 Specific DW-MSHC Driver Extension");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_ALIAS("platform:dwmmc_starfive");
|