rockchip: Add an MMC driver

Add an MMC driver which supports RK3288, but may also support other SoCs.
It uses the Designware MMC device.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/mmc/Kconfig

@@ -10,6 +10,15 @@ config DM_MMC
 	  appear as block devices in U-Boot and can support filesystems such
 	  as EXT4 and FAT.
 
+config ROCKCHIP_DWMMC
+	bool "Rockchip SD/MMC controller support"
+	depends on DM_MMC && OF_CONTROL
+	help
+	  This enables support for the Rockchip SD/MMM controller, which is
+	  based on Designware IP. The device is compatible with at least
+	  SD 3.0, SDIO 3.0 and MMC 4.5 and supports common eMMC chips as well
+	  as removeable SD and micro-SD cards.
+
 config SH_SDHI
 	bool "SuperH/Renesas ARM SoCs on-chip SDHI host controller support"
 	depends on RMOBILE

drivers/mmc/Makefile

@@ -29,6 +29,7 @@ obj-$(CONFIG_MXS_MMC) += mxsmmc.o
 obj-$(CONFIG_OMAP_HSMMC) += omap_hsmmc.o
 obj-$(CONFIG_X86) += pci_mmc.o
 obj-$(CONFIG_PXA_MMC_GENERIC) += pxa_mmc_gen.o
+obj-$(CONFIG_ROCKCHIP_DWMMC) += rockchip_dw_mmc.o
 obj-$(CONFIG_SUPPORT_EMMC_RPMB) += rpmb.o
 obj-$(CONFIG_S3C_SDI) += s3c_sdi.o
 obj-$(CONFIG_S5P_SDHCI) += s5p_sdhci.o

drivers/mmc/rockchip_dw_mmc.c

@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <dwmmc.h>
+#include <errno.h>
+#include <syscon.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/periph.h>
+#include <linux/err.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct rockchip_dwmmc_priv {
+	struct udevice *clk;
+	struct rk3288_grf *grf;
+	struct dwmci_host host;
+};
+
+static uint rockchip_dwmmc_get_mmc_clk(struct dwmci_host *host, uint freq)
+{
+	struct udevice *dev = host->priv;
+	struct rockchip_dwmmc_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	ret = clk_set_periph_rate(priv->clk, PERIPH_ID_SDMMC0 + host->dev_index,
+				  freq);
+	if (ret < 0) {
+		debug("%s: err=%d\n", __func__, ret);
+		return ret;
+	}
+
+	return freq;
+}
+
+static int rockchip_dwmmc_ofdata_to_platdata(struct udevice *dev)
+{
+	struct rockchip_dwmmc_priv *priv = dev_get_priv(dev);
+	struct dwmci_host *host = &priv->host;
+
+	host->name = dev->name;
+	host->ioaddr = (void *)dev_get_addr(dev);
+	host->buswidth = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+					"bus-width", 4);
+	host->get_mmc_clk = rockchip_dwmmc_get_mmc_clk;
+	host->priv = dev;
+
+	/* TODO(sjg@chromium.org): Remove the need for this hack */
+	host->dev_index = (ulong)host->ioaddr == 0xff0f0000 ? 0 : 1;
+
+	return 0;
+}
+
+static int rockchip_dwmmc_probe(struct udevice *dev)
+{
+	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+	struct rockchip_dwmmc_priv *priv = dev_get_priv(dev);
+	struct dwmci_host *host = &priv->host;
+	u32 minmax[2];
+	int ret;
+
+	priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
+	if (IS_ERR(priv->grf))
+		return PTR_ERR(priv->grf);
+	ret = uclass_get_device(UCLASS_CLK, CLK_GENERAL, &priv->clk);
+	if (ret)
+		return ret;
+
+	ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset,
+				   "clock-freq-min-max", minmax, 2);
+	if (!ret)
+		ret = add_dwmci(host, minmax[1], minmax[0]);
+	if (ret)
+		return ret;
+
+	upriv->mmc = host->mmc;
+
+	return 0;
+}
+
+static const struct udevice_id rockchip_dwmmc_ids[] = {
+	{ .compatible = "rockchip,rk3288-dw-mshc" },
+	{ }
+};
+
+U_BOOT_DRIVER(rockchip_dwmmc_drv) = {
+	.name		= "rockchip_dwmmc",
+	.id		= UCLASS_MMC,
+	.of_match	= rockchip_dwmmc_ids,
+	.ofdata_to_platdata = rockchip_dwmmc_ofdata_to_platdata,
+	.probe		= rockchip_dwmmc_probe,
+	.priv_auto_alloc_size = sizeof(struct rockchip_dwmmc_priv),
+};