[RFC,v2,05/13] mmc: add nexell driver

diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 2f0eedc..bb8e7c0 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -253,6 +253,12 @@  config MMC_DW_SNPS
 	  This selects support for Synopsys DesignWare Memory Card Interface driver
 	  extensions used in various Synopsys ARC devboards.
 
+config NEXELL_DWMMC
+	bool "Nexell SD/MMC controller support"
+	depends on ARCH_NEXELL
+	depends on MMC_DW
+	default y
+
 config MMC_MESON_GX
 	bool "Meson GX EMMC controller support"
 	depends on DM_MMC && BLK && ARCH_MESON
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index 9c1f8e5..a7b5a7b 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -43,6 +43,7 @@  obj-$(CONFIG_SH_MMCIF) += sh_mmcif.o
 obj-$(CONFIG_SH_SDHI) += sh_sdhi.o
 obj-$(CONFIG_STM32_SDMMC2) += stm32_sdmmc2.o
 obj-$(CONFIG_JZ47XX_MMC) += jz_mmc.o
+obj-$(CONFIG_NEXELL_DWMMC) += nexell_dw_mmc_dm.o
 
 # SDHCI
 obj-$(CONFIG_MMC_SDHCI)			+= sdhci.o
diff --git a/drivers/mmc/nexell_dw_mmc_dm.c b/drivers/mmc/nexell_dw_mmc_dm.c
new file mode 100644
index 0000000..b06b60d
--- /dev/null
+++ b/drivers/mmc/nexell_dw_mmc_dm.c
@@ -0,0 +1,350 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Nexell
+ * Youngbok, Park <park at nexell.co.kr>
+ *
+ * (C) Copyright 2019 Stefan Bosch <stefan_b at posteo.net>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <dt-structs.h>
+#include <dwmmc.h>
+#include <syscon.h>
+#include <asm/gpio.h>
+#include <asm/arch/nx_gpio.h>
+#include <asm/arch/reset.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;
+
+};
+
+struct clk *clk_get(const char *id);
+
+static void set_pin_stat(int index, int bit, int value)
+{
+#if !defined(CONFIG_SPL_BUILD)
+	nx_gpio_set_pad_function(index, bit, value);
+#else
+#if defined(CONFIG_ARCH_S5P4418) ||	\
+	defined(CONFIG_ARCH_S5P6818)
+
+	unsigned long base[5] = {
+		PHY_BASEADDR_GPIOA, PHY_BASEADDR_GPIOB,
+		PHY_BASEADDR_GPIOC, PHY_BASEADDR_GPIOD,
+		PHY_BASEADDR_GPIOE,
+	};
+
+	dw_mmc_set_pin(base[index], bit, value);
+#endif
+#endif
+}
+
+static void nx_dw_mmc_set_pin(struct dwmci_host *host)
+{
+	debug("  %s(): dev_index == %d", __func__, host->dev_index);
+
+	switch (host->dev_index) {
+	case 0:
+		set_pin_stat(0, 29, 1);
+		set_pin_stat(0, 31, 1);
+		set_pin_stat(1, 1, 1);
+		set_pin_stat(1, 3, 1);
+		set_pin_stat(1, 5, 1);
+		set_pin_stat(1, 7, 1);
+		break;
+	case 1:
+		set_pin_stat(3, 22, 1);
+		set_pin_stat(3, 23, 1);
+		set_pin_stat(3, 24, 1);
+		set_pin_stat(3, 25, 1);
+		set_pin_stat(3, 26, 1);
+		set_pin_stat(3, 27, 1);
+		break;
+	case 2:
+		set_pin_stat(2, 18, 2);
+		set_pin_stat(2, 19, 2);
+		set_pin_stat(2, 20, 2);
+		set_pin_stat(2, 21, 2);
+		set_pin_stat(2, 22, 2);
+		set_pin_stat(2, 23, 2);
+		if (host->buswidth == 8) {
+			set_pin_stat(4, 21, 2);
+			set_pin_stat(4, 22, 2);
+			set_pin_stat(4, 23, 2);
+			set_pin_stat(4, 24, 2);
+		}
+		break;
+	default:
+		debug(" is invalid!");
+	}
+	debug("\n");
+}
+
+static void nx_dw_mmc_clksel(struct dwmci_host *host)
+{
+	u32 val;
+
+#ifdef CONFIG_BOOST_MMC
+	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);
+#endif
+
+	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)
+			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)
+{
+	/* if (dev): *priv = dev->priv, else: *priv = NULL */
+	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);
+
+	val = dev_read_u32_default(dev, "nexell,bus-width", -1);
+	if (val < 0) {
+		debug("  'nexell,bus-width' missing/invalid!\n");
+		return -EINVAL;
+	}
+	host->buswidth = val;
+	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) {
+		debug("  'index' missing/invalid!\n");
+		return -EINVAL;
+	}
+	host->dev_index = val;
+
+	val = dev_read_u32_default(dev, "fifo-size", 0x20);
+	if (val <= 0) {
+		debug("  'fifo-size' missing/invalid!\n");
+		return -EINVAL;
+	}
+	priv->fifo_size = val;
+
+	priv->fifo_mode = dev_read_bool(dev, "fifo-mode");
+
+	val = dev_read_u32_default(dev, "frequency", -1);
+	if (val < 0) {
+		debug("  'frequency' missing/invalid!\n");
+		return -EINVAL;
+	}
+	priv->frequency = val;
+
+	val = dev_read_u32_default(dev, "max-frequency", -1);
+	if (val < 0) {
+		debug("  'max-frequency' missing/invalid!\n");
+		return -EINVAL;
+	}
+	priv->max_freq = val;
+	priv->min_freq = 400000;  /* 400 kHz */
+
+	val = dev_read_u32_default(dev, "nexell,drive_dly", -1);
+	if (val < 0) {
+		debug("  'nexell,drive_dly' missing/invalid!\n");
+		return -EINVAL;
+	}
+	priv->d_delay = val;
+
+	val = dev_read_u32_default(dev, "nexell,drive_shift", -1);
+	if (val < 0) {
+		debug("  'nexell,drive_shift' missing/invalid!\n");
+		return -EINVAL;
+	}
+	priv->d_shift = val;
+
+	val = dev_read_u32_default(dev, "nexell,sample_dly", -1);
+	if (val < 0) {
+		debug("  'nexell,sample_dly' missing/invalid!\n");
+		return -EINVAL;
+	}
+	priv->s_delay = val;
+
+	val = dev_read_u32_default(dev, "nexell,sample_shift", -1);
+	if (val < 0) {
+		debug("  'nexell,sample_shift' missing/invalid!\n");
+		return -EINVAL;
+	}
+	priv->s_shift = val;
+
+	debug("  index==%d, name==%s, ioaddr==0x%08x, buswidth==%d, "
+		  "fifo_size==%d, fifo_mode==%d, frequency==%d\n",
+		  host->dev_index, host->name, (u32)host->ioaddr,
+		  host->buswidth, priv->fifo_size, priv->fifo_mode,
+		  priv->frequency);
+	debug("  min_freq==%d, max_freq==%d, delay: "
+		  "0x%02x:0x%02x:0x%02x:0x%02x\n",
+		  priv->min_freq, priv->max_freq, priv->d_delay,
+		  priv->d_shift, priv->s_delay, priv->s_shift);
+
+	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;
+
+	debug("%s():\n", __func__);
+
+	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;
+
+	nx_dw_mmc_set_pin(host);
+
+	debug("  nx_dw_mmc_set_clk(host, frequency * 4 == %d)\n",
+	      priv->frequency * 4);
+	nx_dw_mmc_set_clk(host, 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),
+};