diff options
Diffstat (limited to 'drivers/mmc/nexell_dw_mmc.c')
| -rw-r--r-- | drivers/mmc/nexell_dw_mmc.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/drivers/mmc/nexell_dw_mmc.c b/drivers/mmc/nexell_dw_mmc.c new file mode 100644 index 0000000000..0462759444 --- /dev/null +++ b/drivers/mmc/nexell_dw_mmc.c @@ -0,0 +1,237 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2016 Nexell + * Youngbok, Park <park@nexell.co.kr> + * + * (C) Copyright 2019 Stefan Bosch <stefan_b@posteo.net> + */ + +#include <common.h> +#include <dm.h> +#include <dt-structs.h> +#include <dwmmc.h> +#include <log.h> +#include <syscon.h> +#include <asm/arch/reset.h> +#include <asm/arch/clk.h> + +#define DWMCI_CLKSEL 0x09C +#define DWMCI_SHIFT_0 0x0 +#define DWMCI_SHIFT_1 0x1 +#define DWMCI_SHIFT_2 0x2 +#define DWMCI_SHIFT_3 0x3 +#define DWMCI_SET_SAMPLE_CLK(x) (x) +#define DWMCI_SET_DRV_CLK(x) ((x) << 16) +#define DWMCI_SET_DIV_RATIO(x) ((x) << 24) +#define DWMCI_CLKCTRL 0x114 +#define NX_MMC_CLK_DELAY(x, y, a, b) ((((x) & 0xFF) << 0) |\ + (((y) & 0x03) << 16) |\ + (((a) & 0xFF) << 8) |\ + (((b) & 0x03) << 24)) + +struct nexell_mmc_plat { + struct mmc_config cfg; + struct mmc mmc; +}; + +struct nexell_dwmmc_priv { + struct clk *clk; + struct dwmci_host host; + int fifo_size; + bool fifo_mode; + int frequency; + u32 min_freq; + u32 max_freq; + int d_delay; + int d_shift; + int s_delay; + int s_shift; + bool mmcboost; +}; + +struct clk *clk_get(const char *id); + +static void nx_dw_mmc_clksel(struct dwmci_host *host) +{ + /* host->priv is pointer to "struct udevice" */ + struct nexell_dwmmc_priv *priv = dev_get_priv(host->priv); + u32 val; + + if (priv->mmcboost) + val = DWMCI_SET_SAMPLE_CLK(DWMCI_SHIFT_0) | + DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) | DWMCI_SET_DIV_RATIO(1); + else + val = DWMCI_SET_SAMPLE_CLK(DWMCI_SHIFT_0) | + DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) | DWMCI_SET_DIV_RATIO(3); + + dwmci_writel(host, DWMCI_CLKSEL, val); +} + +static void nx_dw_mmc_reset(int ch) +{ + int rst_id = RESET_ID_SDMMC0 + ch; + + nx_rstcon_setrst(rst_id, 0); + nx_rstcon_setrst(rst_id, 1); +} + +static void nx_dw_mmc_clk_delay(struct udevice *dev) +{ + unsigned int delay; + struct nexell_dwmmc_priv *priv = dev_get_priv(dev); + struct dwmci_host *host = &priv->host; + + delay = NX_MMC_CLK_DELAY(priv->d_delay, + priv->d_shift, priv->s_delay, priv->s_shift); + + writel(delay, (host->ioaddr + DWMCI_CLKCTRL)); + debug("%s: Values set: d_delay==%d, d_shift==%d, s_delay==%d, " + "s_shift==%d\n", __func__, priv->d_delay, priv->d_shift, + priv->s_delay, priv->s_shift); +} + +static unsigned int nx_dw_mmc_get_clk(struct dwmci_host *host, uint freq) +{ + struct clk *clk; + struct udevice *dev = host->priv; + struct nexell_dwmmc_priv *priv = dev_get_priv(dev); + + int index = host->dev_index; + char name[50] = { 0, }; + + clk = priv->clk; + if (!clk) { + sprintf(name, "%s.%d", DEV_NAME_SDHC, index); + clk = clk_get((const char *)name); + if (!clk) + return 0; + priv->clk = clk; + } + + return clk_get_rate(clk) / 2; +} + +static unsigned long nx_dw_mmc_set_clk(struct dwmci_host *host, + unsigned int rate) +{ + struct clk *clk; + char name[50] = { 0, }; + struct udevice *dev = host->priv; + struct nexell_dwmmc_priv *priv = dev_get_priv(dev); + + int index = host->dev_index; + + clk = priv->clk; + if (!clk) { + sprintf(name, "%s.%d", DEV_NAME_SDHC, index); + clk = clk_get((const char *)name); + if (!clk) { + debug("%s: clk_get(\"%s\") failed!\n", __func__, name); + return 0; + } + priv->clk = clk; + } + + clk_disable(clk); + rate = clk_set_rate(clk, rate); + clk_enable(clk); + + return rate; +} + +static int nexell_dwmmc_ofdata_to_platdata(struct udevice *dev) +{ + struct nexell_dwmmc_priv *priv = dev_get_priv(dev); + struct dwmci_host *host = &priv->host; + int val = -1; + + debug("%s\n", __func__); + + host->name = dev->name; + host->ioaddr = dev_read_addr_ptr(dev); + host->buswidth = dev_read_u32_default(dev, "bus-width", 4); + host->get_mmc_clk = nx_dw_mmc_get_clk; + host->clksel = nx_dw_mmc_clksel; + host->priv = dev; + + val = dev_read_u32_default(dev, "index", -1); + if (val < 0 || val > 2) { + debug(" 'index' missing/invalid!\n"); + return -EINVAL; + } + host->dev_index = val; + + priv->fifo_size = dev_read_u32_default(dev, "fifo-size", 0x20); + priv->fifo_mode = dev_read_bool(dev, "fifo-mode"); + priv->frequency = dev_read_u32_default(dev, "frequency", 50000000); + priv->max_freq = dev_read_u32_default(dev, "max-frequency", 50000000); + priv->min_freq = 400000; /* 400 kHz */ + priv->d_delay = dev_read_u32_default(dev, "drive_dly", 0); + priv->d_shift = dev_read_u32_default(dev, "drive_shift", 3); + priv->s_delay = dev_read_u32_default(dev, "sample_dly", 0); + priv->s_shift = dev_read_u32_default(dev, "sample_shift", 2); + priv->mmcboost = dev_read_u32_default(dev, "mmcboost", 0); + + debug(" index==%d, name==%s, ioaddr==0x%08x\n", + host->dev_index, host->name, (u32)host->ioaddr); + return 0; +} + +static int nexell_dwmmc_probe(struct udevice *dev) +{ + struct nexell_mmc_plat *plat = dev_get_platdata(dev); + struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev); + struct nexell_dwmmc_priv *priv = dev_get_priv(dev); + struct dwmci_host *host = &priv->host; + struct udevice *pwr_dev __maybe_unused; + + host->fifoth_val = MSIZE(0x2) | + RX_WMARK(priv->fifo_size / 2 - 1) | + TX_WMARK(priv->fifo_size / 2); + + host->fifo_mode = priv->fifo_mode; + + dwmci_setup_cfg(&plat->cfg, host, priv->max_freq, priv->min_freq); + host->mmc = &plat->mmc; + host->mmc->priv = &priv->host; + host->mmc->dev = dev; + upriv->mmc = host->mmc; + + if (nx_dw_mmc_set_clk(host, priv->frequency * 4) != + priv->frequency * 4) { + debug("%s: nx_dw_mmc_set_clk(host, %d) failed!\n", + __func__, priv->frequency * 4); + return -EIO; + } + debug("%s: nx_dw_mmc_set_clk(host, %d) OK\n", + __func__, priv->frequency * 4); + + nx_dw_mmc_reset(host->dev_index); + nx_dw_mmc_clk_delay(dev); + + return dwmci_probe(dev); +} + +static int nexell_dwmmc_bind(struct udevice *dev) +{ + struct nexell_mmc_plat *plat = dev_get_platdata(dev); + + return dwmci_bind(dev, &plat->mmc, &plat->cfg); +} + +static const struct udevice_id nexell_dwmmc_ids[] = { + { .compatible = "nexell,nexell-dwmmc" }, + { } +}; + +U_BOOT_DRIVER(nexell_dwmmc_drv) = { + .name = "nexell_dwmmc", + .id = UCLASS_MMC, + .of_match = nexell_dwmmc_ids, + .ofdata_to_platdata = nexell_dwmmc_ofdata_to_platdata, + .ops = &dm_dwmci_ops, + .bind = nexell_dwmmc_bind, + .probe = nexell_dwmmc_probe, + .priv_auto_alloc_size = sizeof(struct nexell_dwmmc_priv), + .platdata_auto_alloc_size = sizeof(struct nexell_mmc_plat), +}; |