[U-Boot] [PATCH v4 27/33] rockchip: Add an MMC driver

Simon Glass
2015-08-24T15:12:45Z

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>
---

Changes in v4: None
Changes in v3: None
Changes in v2: None

drivers/mmc/Kconfig | 9 +++++
drivers/mmc/Makefile | 1 +
drivers/mmc/rockchip_mmc.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 108 insertions(+)
create mode 100644 drivers/mmc/rockchip_mmc.c

diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 3e835f7..cd5f53c 100644
--- a/drivers/mmc/Kconfig
+++ b/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_MMC
+ bool "Rockchip SD/MMC controller support"
+ depends on DM && OF_CONTROL
+ help
+ This enables support for the Rockchip SD/MMM controller, which is
+ based on Designware IP. The device is compatible with 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
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index cae207c..7fd63de 100644
--- a/drivers/mmc/Makefile
+++ b/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-$(CONFIG_ROCKCHIP_MMC) += rockchip_mmc.o
obj-$(CONFIG_SUPPORT_EMMC_RPMB) += rpmb.o
obj-$(CONFIG_S3C_SDI) += s3c_sdi.o
obj-$(CONFIG_S5P_SDHCI) += s5p_sdhci.o
diff --git a/drivers/mmc/rockchip_mmc.c b/drivers/mmc/rockchip_mmc.c
new file mode 100644
index 0000000..430e7e5
--- /dev/null
+++ b/drivers/mmc/rockchip_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_mmc_priv {
+ struct udevice *clk;
+ struct rk3288_grf *grf;
+ struct dwmci_host host;
+};
+
+static uint rockchip_mmc_get_mmc_clk(struct dwmci_host *host, uint freq)
+{
+ struct udevice *dev = host->priv;
+ struct rockchip_mmc_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_mmc_ofdata_to_platdata(struct udevice *dev)
+{
+ struct rockchip_mmc_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_mmc_get_mmc_clk;
+ host->priv = dev;
+
+ /* TODO(sjg at chromium.org): Remove the need for this hack */
+ host->dev_index = (ulong)host->ioaddr == 0xff0f0000 ? 0 : 1;
+
+ return 0;
+}
+
+int rockchip_mmc_probe(struct udevice *dev)
+{
+ struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+ struct rockchip_mmc_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_mmc_ids[] = {
+ { .compatible = "rockchip,rk3288-dw-mshc" },
+ { }
+};
+
+U_BOOT_DRIVER(rockchip_mmc_drv) = {
+ .name = "rockchip_mmc",
+ .id = UCLASS_MMC,
+ .of_match = rockchip_mmc_ids,
+ .ofdata_to_platdata = rockchip_mmc_ofdata_to_platdata,
+ .probe = rockchip_mmc_probe,
+ .priv_auto_alloc_size = sizeof(struct dwmci_host),
+};
--
2.5.0.457.gab17608