mmc: exynos_dw_mmc: support the Driver mode for Exynos

This patch support the driver mode for exynos dwmmc controller.
To support the legacy model, maintained the existing code.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

drivers/mmc/exynos_dw_mmc.c

@@ -23,8 +23,21 @@
 #define	DWMMC_MMC0_SDR_TIMING_VAL	0x03030001
 #define	DWMMC_MMC2_SDR_TIMING_VAL	0x03020001
 
+#ifdef CONFIG_DM_MMC
+#include <dm.h>
+DECLARE_GLOBAL_DATA_PTR;
+
+struct exynos_mmc_plat {
+	struct mmc_config cfg;
+	struct mmc mmc;
+};
+#endif
+
 /* Exynos implmentation specific drver private data */
 struct dwmci_exynos_priv_data {
+#ifdef CONFIG_DM_MMC
+	struct dwmci_host host;
+#endif
 	u32 sdr_timing;
 };
 
@@ -105,11 +118,15 @@ static int exynos_dwmci_core_init(struct dwmci_host *host)
 	host->caps = MMC_MODE_DDR_52MHz;
 	host->clksel = exynos_dwmci_clksel;
 	host->get_mmc_clk = exynos_dwmci_get_clk;
+
+#ifndef CONFIG_DM_MMC
 	/* Add the mmc channel to be registered with mmc core */
 	if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) {
 		printf("DWMMC%d registration failed\n", host->dev_index);
 		return -1;
 	}
+#endif
+
 	return 0;
 }
 
@@ -237,3 +254,58 @@ int exynos_dwmmc_init(const void *blob)
 
 	return err;
 }
+
+#ifdef CONFIG_DM_MMC
+static int exynos_dwmmc_probe(struct udevice *dev)
+{
+	struct exynos_mmc_plat *plat = dev_get_platdata(dev);
+	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+	struct dwmci_exynos_priv_data *priv = dev_get_priv(dev);
+	struct dwmci_host *host = &priv->host;
+	int err;
+
+	err = exynos_dwmci_get_config(gd->fdt_blob, dev->of_offset, host);
+	if (err)
+		return err;
+	err = do_dwmci_init(host);
+	if (err)
+		return err;
+
+	dwmci_setup_cfg(&plat->cfg, host->name, host->buswidth, host->caps,
+			DWMMC_MAX_FREQ, DWMMC_MIN_FREQ);
+	host->mmc = &plat->mmc;
+	host->mmc->priv = &priv->host;
+	host->priv = dev;
+	upriv->mmc = host->mmc;
+
+	return dwmci_probe(dev);
+}
+
+static int exynos_dwmmc_bind(struct udevice *dev)
+{
+	struct exynos_mmc_plat *plat = dev_get_platdata(dev);
+	int ret;
+
+	ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static const struct udevice_id exynos_dwmmc_ids[] = {
+	{ .compatible = "samsung,exynos4412-dw-mshc" },
+	{ }
+};
+
+U_BOOT_DRIVER(exynos_dwmmc_drv) = {
+	.name		= "exynos_dwmmc",
+	.id		= UCLASS_MMC,
+	.of_match	= exynos_dwmmc_ids,
+	.bind		= exynos_dwmmc_bind,
+	.ops		= &dm_dwmci_ops,
+	.probe		= exynos_dwmmc_probe,
+	.priv_auto_alloc_size	= sizeof(struct dwmci_exynos_priv_data),
+	.platdata_auto_alloc_size = sizeof(struct exynos_mmc_plat),
+};
+#endif