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// SPDX-License-Identifier: GPL-2.0+
/*
* Synopsys DesignWare Multimedia Card Interface driver
* extensions used in various Synopsys ARC devboards.
*
* Copyright (C) 2019 Synopsys
* Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <dwmmc.h>
#include <errno.h>
#include <fdtdec.h>
#include <dm/device_compat.h>
#include <linux/libfdt.h>
#include <linux/err.h>
#include <malloc.h>
#define CLOCK_MIN 400000 /* 400 kHz */
#define FIFO_MIN 8
#define FIFO_MAX 4096
struct snps_dwmci_plat {
struct mmc_config cfg;
struct mmc mmc;
};
struct snps_dwmci_priv_data {
struct dwmci_host host;
u32 f_max;
};
static int snps_dwmmc_clk_setup(struct udevice *dev)
{
struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
struct dwmci_host *host = &priv->host;
struct clk clk_ciu, clk_biu;
int ret;
ret = clk_get_by_name(dev, "ciu", &clk_ciu);
if (ret)
goto clk_err;
ret = clk_enable(&clk_ciu);
if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
goto clk_err_ciu;
host->bus_hz = clk_get_rate(&clk_ciu);
if (host->bus_hz < CLOCK_MIN) {
ret = -EINVAL;
goto clk_err_ciu_dis;
}
ret = clk_get_by_name(dev, "biu", &clk_biu);
if (ret)
goto clk_err_ciu_dis;
ret = clk_enable(&clk_biu);
if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
goto clk_err_biu;
return 0;
clk_err_biu:
clk_free(&clk_biu);
clk_err_ciu_dis:
clk_disable(&clk_ciu);
clk_err_ciu:
clk_free(&clk_ciu);
clk_err:
dev_err(dev, "failed to setup clocks, ret %d\n", ret);
return ret;
}
static int snps_dwmmc_of_to_plat(struct udevice *dev)
{
struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
struct dwmci_host *host = &priv->host;
u32 fifo_depth;
int ret;
host->ioaddr = dev_read_addr_ptr(dev);
/*
* If fifo-depth is unset don't set fifoth_val - we will try to
* auto detect it.
*/
ret = dev_read_u32(dev, "fifo-depth", &fifo_depth);
if (!ret) {
if (fifo_depth < FIFO_MIN || fifo_depth > FIFO_MAX)
return -EINVAL;
host->fifoth_val = MSIZE(0x2) |
RX_WMARK(fifo_depth / 2 - 1) |
TX_WMARK(fifo_depth / 2);
}
host->buswidth = dev_read_u32_default(dev, "bus-width", 4);
if (host->buswidth != 1 && host->buswidth != 4 && host->buswidth != 8)
return -EINVAL;
/*
* If max-frequency is unset don't set priv->f_max - we will use
* host->bus_hz in probe() instead.
*/
ret = dev_read_u32(dev, "max-frequency", &priv->f_max);
if (!ret && priv->f_max < CLOCK_MIN)
return -EINVAL;
host->fifo_mode = dev_read_bool(dev, "fifo-mode");
host->name = dev->name;
host->dev_index = 0;
host->priv = priv;
return 0;
}
int snps_dwmmc_getcd(struct udevice *dev)
{
struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
struct dwmci_host *host = &priv->host;
return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
}
struct dm_mmc_ops snps_dwmci_dm_ops;
static int snps_dwmmc_probe(struct udevice *dev)
{
#ifdef CONFIG_BLK
struct snps_dwmci_plat *plat = dev_get_plat(dev);
#endif
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
struct dwmci_host *host = &priv->host;
unsigned int clock_max;
int ret;
/* Extend generic 'dm_dwmci_ops' with our 'getcd' implementation */
memcpy(&snps_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
snps_dwmci_dm_ops.get_cd = snps_dwmmc_getcd;
ret = snps_dwmmc_clk_setup(dev);
if (ret)
return ret;
if (!priv->f_max)
clock_max = host->bus_hz;
else
clock_max = min_t(unsigned int, host->bus_hz, priv->f_max);
#ifdef CONFIG_BLK
dwmci_setup_cfg(&plat->cfg, host, clock_max, CLOCK_MIN);
host->mmc = &plat->mmc;
#else
ret = add_dwmci(host, clock_max, CLOCK_MIN);
if (ret)
return ret;
#endif
host->mmc->priv = &priv->host;
upriv->mmc = host->mmc;
host->mmc->dev = dev;
return dwmci_probe(dev);
}
static int snps_dwmmc_bind(struct udevice *dev)
{
#ifdef CONFIG_BLK
struct snps_dwmci_plat *plat = dev_get_plat(dev);
int ret;
ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
if (ret)
return ret;
#endif
return 0;
}
static const struct udevice_id snps_dwmmc_ids[] = {
{ .compatible = "snps,dw-mshc" },
{ }
};
U_BOOT_DRIVER(snps_dwmmc_drv) = {
.name = "snps_dw_mmc",
.id = UCLASS_MMC,
.of_match = snps_dwmmc_ids,
.of_to_plat = snps_dwmmc_of_to_plat,
.ops = &snps_dwmci_dm_ops,
.bind = snps_dwmmc_bind,
.probe = snps_dwmmc_probe,
.priv_auto = sizeof(struct snps_dwmci_priv_data),
.plat_auto = sizeof(struct snps_dwmci_plat),
};
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