mmc: hi6220_dw_mmc: Add hi6220 glue code for dw_mmc controller.

This patch adds the glue code for hi6220 SoC which has 2x synopsis
dw_mmc controllers. This will be used by the hikey board support
in subsequent patches.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/include/asm/arch-hi6220/dwmmc.h

+/*
+ * (C) Copyright 2015 Linaro
+ * Peter Griffin <peter.griffin@linaro.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+int hi6220_dwmci_add_port(int index, u32 regbase, int bus_width);

drivers/mmc/Makefile

@@ -13,6 +13,7 @@ obj-$(CONFIG_BFIN_SDH) += bfin_sdh.o
 obj-$(CONFIG_DAVINCI_MMC) += davinci_mmc.o
 obj-$(CONFIG_DWMMC) += dw_mmc.o
 obj-$(CONFIG_EXYNOS_DWMMC) += exynos_dw_mmc.o
+obj-$(CONFIG_HIKEY_DWMMC) += hi6220_dw_mmc.o
 obj-$(CONFIG_FSL_ESDHC) += fsl_esdhc.o
 obj-$(CONFIG_FTSDC010) += ftsdc010_mci.o
 obj-$(CONFIG_FTSDC021) += ftsdc021_sdhci.o

drivers/mmc/hi6220_dw_mmc.c

+/*
+ * (C) Copyright 2015 Linaro
+ * peter.griffin <peter.griffin@linaro.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dwmmc.h>
+#include <malloc.h>
+#include <asm-generic/errno.h>
+
+#define	DWMMC_MAX_CH_NUM		4
+
+#define	DWMMC_MAX_FREQ			50000000
+#define	DWMMC_MIN_FREQ			400000
+
+/* Source clock is configured to 100MHz by ATF bl1*/
+#define MMC0_DEFAULT_FREQ		100000000
+
+static int hi6220_dwmci_core_init(struct dwmci_host *host, int index)
+{
+	host->name = "HiKey DWMMC";
+
+	host->dev_index = index;
+
+	/* 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", index);
+		return -1;
+	}
+	return 0;
+}
+
+/*
+ * This function adds the mmc channel to be registered with mmc core.
+ * index -	mmc channel number.
+ * regbase -	register base address of mmc channel specified in 'index'.
+ * bus_width -	operating bus width of mmc channel specified in 'index'.
+ */
+int hi6220_dwmci_add_port(int index, u32 regbase, int bus_width)
+{
+	struct dwmci_host *host = NULL;
+
+	host = calloc(1, sizeof(struct dwmci_host));
+	if (!host) {
+		error("dwmci_host calloc failed!\n");
+		return -ENOMEM;
+	}
+
+	host->ioaddr = (void *)regbase;
+	host->buswidth = bus_width;
+	host->bus_hz = MMC0_DEFAULT_FREQ;
+
+	return hi6220_dwmci_core_init(host, index);
+}