drivers:mmc:sdhci: enable support for DT

This patch enables support for device tree for sdhci driver.
Non DT case is still supported.

Signed-off-by: Piotr Wilczek <p.wilczek@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

arch/arm/include/asm/arch-exynos/mmc.h

@@ -53,6 +53,8 @@
 #define SDHCI_CTRL4_DRIVE_MASK(_x)	((_x) << 16)
 #define SDHCI_CTRL4_DRIVE_SHIFT		(16)
 
+#define SDHCI_MAX_HOSTS 4
+
 int s5p_sdhci_init(u32 regbase, int index, int bus_width);
 
 static inline int s5p_mmc_init(int index, int bus_width)
@@ -62,4 +64,9 @@ static inline int s5p_mmc_init(int index, int bus_width)
 
 	return s5p_sdhci_init(base, index, bus_width);
 }
+
+#ifdef CONFIG_OF_CONTROL
+int exynos_mmc_init(const void *blob);
+#endif
+
 #endif

drivers/mmc/s5p_sdhci.c

@@ -8,8 +8,15 @@
 #include <common.h>
 #include <malloc.h>
 #include <sdhci.h>
+#include <fdtdec.h>
+#include <libfdt.h>
+#include <asm/gpio.h>
 #include <asm/arch/mmc.h>
 #include <asm/arch/clk.h>
+#include <errno.h>
+#ifdef CONFIG_OF_CONTROL
+#include <asm/arch/pinmux.h>
+#endif
 
 static char *S5P_NAME = "SAMSUNG SDHCI";
 static void s5p_sdhci_set_control_reg(struct sdhci_host *host)
@@ -86,3 +93,125 @@ int s5p_sdhci_init(u32 regbase, int index, int bus_width)
 
 	return add_sdhci(host, 52000000, 400000);
 }
+
+#ifdef CONFIG_OF_CONTROL
+struct sdhci_host sdhci_host[SDHCI_MAX_HOSTS];
+
+static int do_sdhci_init(struct sdhci_host *host)
+{
+	int dev_id, flag;
+	int err = 0;
+
+	flag = host->bus_width == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE;
+	dev_id = host->index + PERIPH_ID_SDMMC0;
+
+	if (fdt_gpio_isvalid(&host->pwr_gpio)) {
+		gpio_direction_output(host->pwr_gpio.gpio, 1);
+		err = exynos_pinmux_config(dev_id, flag);
+		if (err) {
+			debug("MMC not configured\n");
+			return err;
+		}
+	}
+
+	if (fdt_gpio_isvalid(&host->cd_gpio)) {
+		gpio_direction_output(host->cd_gpio.gpio, 0xf);
+		if (gpio_get_value(host->cd_gpio.gpio))
+			return -ENODEV;
+
+		err = exynos_pinmux_config(dev_id, flag);
+		if (err) {
+			printf("external SD not configured\n");
+			return err;
+		}
+	}
+
+	host->name = S5P_NAME;
+
+	host->quirks = SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_BROKEN_VOLTAGE |
+		SDHCI_QUIRK_BROKEN_R1B | SDHCI_QUIRK_32BIT_DMA_ADDR |
+		SDHCI_QUIRK_WAIT_SEND_CMD;
+	host->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
+	host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
+
+	host->set_control_reg = &s5p_sdhci_set_control_reg;
+	host->set_clock = set_mmc_clk;
+
+	host->host_caps = MMC_MODE_HC;
+
+	return add_sdhci(host, 52000000, 400000);
+}
+
+static int sdhci_get_config(const void *blob, int node, struct sdhci_host *host)
+{
+	int bus_width, dev_id;
+	unsigned int base;
+
+	/* Get device id */
+	dev_id = pinmux_decode_periph_id(blob, node);
+	if (dev_id < PERIPH_ID_SDMMC0 && dev_id > PERIPH_ID_SDMMC3) {
+		debug("MMC: Can't get device id\n");
+		return -1;
+	}
+	host->index = dev_id - PERIPH_ID_SDMMC0;
+
+	/* Get bus width */
+	bus_width = fdtdec_get_int(blob, node, "samsung,bus-width", 0);
+	if (bus_width <= 0) {
+		debug("MMC: Can't get bus-width\n");
+		return -1;
+	}
+	host->bus_width = bus_width;
+
+	/* Get the base address from the device node */
+	base = fdtdec_get_addr(blob, node, "reg");
+	if (!base) {
+		debug("MMC: Can't get base address\n");
+		return -1;
+	}
+	host->ioaddr = (void *)base;
+
+	fdtdec_decode_gpio(blob, node, "pwr-gpios", &host->pwr_gpio);
+	fdtdec_decode_gpio(blob, node, "cd-gpios", &host->cd_gpio);
+
+	return 0;
+}
+
+static int process_nodes(const void *blob, int node_list[], int count)
+{
+	struct sdhci_host *host;
+	int i, node;
+
+	debug("%s: count = %d\n", __func__, count);
+
+	/* build sdhci_host[] for each controller */
+	for (i = 0; i < count; i++) {
+		node = node_list[i];
+		if (node <= 0)
+			continue;
+
+		host = &sdhci_host[i];
+
+		if (sdhci_get_config(blob, node, host)) {
+			printf("%s: failed to decode dev %d\n",	__func__, i);
+			return -1;
+		}
+		do_sdhci_init(host);
+	}
+	return 0;
+}
+
+int exynos_mmc_init(const void *blob)
+{
+	int count;
+	int node_list[SDHCI_MAX_HOSTS];
+
+	count = fdtdec_find_aliases_for_id(blob, "mmc",
+			COMPAT_SAMSUNG_EXYNOS_MMC, node_list,
+			SDHCI_MAX_HOSTS);
+
+	process_nodes(blob, node_list, count);
+
+	return 1;
+}
+#endif

include/fdtdec.h

@@ -82,6 +82,7 @@ enum fdt_compat_id {
 	COMPAT_SAMSUNG_EXYNOS_MIPI_DSI,	/* Exynos mipi dsi */
 	COMPAT_SAMSUNG_EXYNOS5_DP,	/* Exynos Display port controller */
 	COMPAT_SAMSUNG_EXYNOS5_DWMMC,	/* Exynos5 DWMMC controller */
+	COMPAT_SAMSUNG_EXYNOS_MMC,	/* Exynos MMC controller */
 	COMPAT_SAMSUNG_EXYNOS_SERIAL,	/* Exynos UART */
 	COMPAT_MAXIM_MAX77686_PMIC,	/* MAX77686 PMIC */
 	COMPAT_GENERIC_SPI_FLASH,	/* Generic SPI Flash chip */

include/sdhci.h

@@ -12,6 +12,7 @@
 
 #include <asm/io.h>
 #include <mmc.h>
+#include <fdtdec.h>
 
 /*
  * Controller registers
@@ -244,6 +245,10 @@ struct sdhci_host {
 	const struct sdhci_ops *ops;
 	int index;
 
+	int bus_width;
+	struct fdt_gpio_state pwr_gpio;	/* Power GPIO */
+	struct fdt_gpio_state cd_gpio;		/* Card Detect GPIO */
+
 	void (*set_control_reg)(struct sdhci_host *host);
 	void (*set_clock)(int dev_index, unsigned int div);
 	uint	voltages;

lib/fdtdec.c

@@ -55,6 +55,7 @@ static const char * const compat_names[COMPAT_COUNT] = {
 	COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"),
 	COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"),
 	COMPAT(SAMSUNG_EXYNOS5_DWMMC, "samsung,exynos5250-dwmmc"),
+	COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"),
 	COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"),
 	COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"),
 	COMPAT(GENERIC_SPI_FLASH, "spi-flash"),