ca_dw_mmc.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2019 Cortina Access
* Arthur Li <arthur.li@cortina-access.com>
*/
#include <common.h>
#include <dwmmc.h>
#include <fdtdec.h>
#include <linux/libfdt.h>
#include <malloc.h>
#include <errno.h>
#include <dm.h>
#include <mapmem.h>
#define SD_CLK_SEL_MASK (0x3)
#define SD_DLL_DEFAULT (0x143000)
#define SD_SCLK_MAX (200000000)
#define SD_CLK_SEL_200MHZ (0x2)
#define SD_CLK_SEL_100MHZ (0x1)
#define IO_DRV_SD_DS_OFFSET (16)
#define IO_DRV_SD_DS_MASK (0xff << IO_DRV_SD_DS_OFFSET)
#define MIN_FREQ (400000)
DECLARE_GLOBAL_DATA_PTR;
struct ca_mmc_plat {
struct mmc_config cfg;
struct mmc mmc;
};
struct ca_dwmmc_priv_data {
struct dwmci_host host;
void __iomem *sd_dll_reg;
void __iomem *io_drv_reg;
u8 ds;
};
static void ca_dwmci_clksel(struct dwmci_host *host)
{
struct ca_dwmmc_priv_data *priv = host->priv;
u32 val = readl(priv->sd_dll_reg);
if (host->bus_hz >= 200000000) {
val &= ~SD_CLK_SEL_MASK;
val |= SD_CLK_SEL_200MHZ;
} else if (host->bus_hz >= 100000000) {
val &= ~SD_CLK_SEL_MASK;
val |= SD_CLK_SEL_100MHZ;
} else {
val &= ~SD_CLK_SEL_MASK;
}
writel(val, priv->sd_dll_reg);
}
static void ca_dwmci_board_init(struct dwmci_host *host)
{
struct ca_dwmmc_priv_data *priv = host->priv;
u32 val = readl(priv->io_drv_reg);
writel(SD_DLL_DEFAULT, priv->sd_dll_reg);
val &= ~IO_DRV_SD_DS_MASK;
if (priv && priv->ds)
val |= priv->ds << IO_DRV_SD_DS_OFFSET;
writel(val, priv->io_drv_reg);
}
unsigned int ca_dwmci_get_mmc_clock(struct dwmci_host *host, uint freq)
{
struct ca_dwmmc_priv_data *priv = host->priv;
u8 sd_clk_sel = readl(priv->sd_dll_reg) & SD_CLK_SEL_MASK;
u8 clk_div;
switch (sd_clk_sel) {
case 2:
clk_div = 1;
break;
case 1:
clk_div = 2;
break;
default:
clk_div = 4;
}
return SD_SCLK_MAX / clk_div / (host->div + 1);
}
static int ca_dwmmc_ofdata_to_platdata(struct udevice *dev)
{
struct ca_dwmmc_priv_data *priv = dev_get_priv(dev);
struct dwmci_host *host = &priv->host;
u32 tmp;
host->name = dev->name;
host->dev_index = 0;
host->buswidth = dev_read_u32_default(dev, "bus-width", 1);
if (host->buswidth != 1 && host->buswidth != 4)
return -EINVAL;
host->bus_hz = dev_read_u32_default(dev, "max-frequency", 50000000);
priv->ds = dev_read_u32_default(dev, "io_ds", 0x33);
host->fifo_mode = dev_read_bool(dev, "fifo-mode");
dev_read_u32(dev, "sd_dll_ctrl", &tmp);
priv->sd_dll_reg = map_sysmem((uintptr_t)tmp, sizeof(uintptr_t));
if (!priv->sd_dll_reg)
return -EINVAL;
dev_read_u32(dev, "io_drv_ctrl", &tmp);
priv->io_drv_reg = map_sysmem((uintptr_t)tmp, sizeof(uintptr_t));
if (!priv->io_drv_reg)
return -EINVAL;
host->ioaddr = dev_read_addr_ptr(dev);
if (host->ioaddr == (void *)FDT_ADDR_T_NONE) {
printf("DWMMC: base address is invalid\n");
return -EINVAL;
}
host->priv = priv;
return 0;
}
struct dm_mmc_ops ca_dwmci_dm_ops;
static int ca_dwmmc_probe(struct udevice *dev)
{
struct ca_mmc_plat *plat = dev_get_platdata(dev);
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct ca_dwmmc_priv_data *priv = dev_get_priv(dev);
struct dwmci_host *host = &priv->host;
memcpy(&ca_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
dwmci_setup_cfg(&plat->cfg, host, host->bus_hz, MIN_FREQ);
if (host->buswidth == 1) {
(&plat->cfg)->host_caps &= ~MMC_MODE_8BIT;
(&plat->cfg)->host_caps &= ~MMC_MODE_4BIT;
}
host->mmc = &plat->mmc;
host->mmc->priv = &priv->host;
upriv->mmc = host->mmc;
host->mmc->dev = dev;
host->clksel = ca_dwmci_clksel;
host->board_init = ca_dwmci_board_init;
host->get_mmc_clk = ca_dwmci_get_mmc_clock;
return dwmci_probe(dev);
}
static int ca_dwmmc_bind(struct udevice *dev)
{
struct ca_mmc_plat *plat = dev_get_platdata(dev);
return dwmci_bind(dev, &plat->mmc, &plat->cfg);
}
static const struct udevice_id ca_dwmmc_ids[] = {
{ .compatible = "snps,dw-cortina" },
{ }
};
U_BOOT_DRIVER(ca_dwmmc_drv) = {
.name = "cortina_dwmmc",
.id = UCLASS_MMC,
.of_match = ca_dwmmc_ids,
.ofdata_to_platdata = ca_dwmmc_ofdata_to_platdata,
.bind = ca_dwmmc_bind,
.ops = &ca_dwmci_dm_ops,
.probe = ca_dwmmc_probe,
.priv_auto_alloc_size = sizeof(struct ca_dwmmc_priv_data),
.platdata_auto_alloc_size = sizeof(struct ca_mmc_plat),
};