mmc: dw_mmc: add dw_mmc-k3 for k3 platform

Add dw_mmc-k3.c for k3v2, support sd/emmc

Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Zhigang Wang <brooke.wangzhigang@huawei.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Chris Ball <chris@printf.net>

4 files changed, 203 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/mmc/k3-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/k3-dw-mshc.txt
new file mode 100644
index 000000000000..d7e2d7f159bb
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/k3-dw-mshc.txt
@@ -0,0 +1,60 @@
+* Hisilicon specific extensions to the Synopsys Designware Mobile
+  Storage Host Controller
+
+Read synopsys-dw-mshc.txt for more details
+
+The Synopsys designware mobile storage host controller is used to interface
+a SoC with storage medium such as eMMC or SD/MMC cards. This file documents
+differences between the core Synopsys dw mshc controller properties described
+by synopsys-dw-mshc.txt and the properties used by the Hisilicon specific
+extensions to the Synopsys Designware Mobile Storage Host Controller.
+
+Required Properties:
+
+* compatible: should be one of the following.
+  - "hisilicon,hi4511-dw-mshc": for controllers with hi4511 specific extentions.
+
+* clock-freq-table: should be the frequency (in Hz) array of the ciu clock
+        in each supported mode.
+        0. CIU clock rate in Hz for DS mode
+        1. CIU clock rate in Hz for MMC HS mode
+        2. CIU clock rate in Hz for SD HS mode
+        3. CIU clock rate in Hz for SDR12 mode
+        4. CIU clock rate in Hz for SDR25 mode
+        5. CIU clock rate in Hz for SDR50 mode
+        6. CIU clock rate in Hz for SDR104 mode
+        7. CIU clock rate in Hz for DDR50 mode
+        8. CIU clock rate in Hz for HS200 mode
+
+Example:
+
+        /* for Hi3620 */
+
+        /* SoC portion */
+        dwmmc_0: dwmmc0@fcd03000 {
+                compatible = "hisilicon,hi4511-dw-mshc";
+                reg = <0xfcd03000 0x1000>;
+                interrupts = <0 16 4>;
+                #address-cells = <1>;
+                #size-cells = <0>;
+                clocks = <&mmc_clock HI3620_SD_CIUCLK>, <&clock HI3620_DDRC_PER_CLK>;
+                clock-names = "ciu", "biu";
+                clock-freq-table =
+                <25000000 0 50000000 25000000 50000000 100000000 0 50000000>;
+        };
+
+        /* Board portion */
+        dwmmc0@fcd03000 {
+                num-slots = <1>;
+                vmmc-supply = <&ldo12>;
+                fifo-depth = <0x100>;
+                supports-highspeed;
+                pinctrl-names = "default";
+                pinctrl-0 = <&sd_pmx_pins &sd_cfg_func1 &sd_cfg_func2>;
+                slot@0 {
+                        reg = <0>;
+                        bus-width = <4>;
+                        disable-wp;
+                        cd-gpios = <&gpio10 3 0>;
+                };
+        };
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 265ba4800134..6da5a085f5f8 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -576,6 +576,16 @@ config MMC_DW_SOCFPGA
           This selects support for Altera SoCFPGA specific extensions to the
           Synopsys DesignWare Memory Card Interface driver.
 
+config MMC_DW_K3
+        tristate "K3 specific extensions for Synopsys DW Memory Card Interface"
+        depends on MMC_DW
+        select MMC_DW_PLTFM
+        select MMC_DW_IDMAC
+        help
+          This selects support for Hisilicon K3 SoC specific extensions to the
+          Synopsys DesignWare Memory Card Interface driver. Select this option
+          for platforms based on Hisilicon K3 SoC's.
+
 config MMC_DW_PCI
         tristate "Synopsys Designware MCI support on PCI bus"
         depends on MMC_DW && PCI
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 5dd3de9b2677..a69fd640698d 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_MMC_DW)		+= dw_mmc.o
 obj-$(CONFIG_MMC_DW_PLTFM)      += dw_mmc-pltfm.o
 obj-$(CONFIG_MMC_DW_EXYNOS)     += dw_mmc-exynos.o
 obj-$(CONFIG_MMC_DW_SOCFPGA)    += dw_mmc-socfpga.o
+obj-$(CONFIG_MMC_DW_K3)         += dw_mmc-k3.o
 obj-$(CONFIG_MMC_DW_PCI)        += dw_mmc-pci.o
 obj-$(CONFIG_MMC_SH_MMCIF)      += sh_mmcif.o
 obj-$(CONFIG_MMC_JZ4740)        += jz4740_mmc.o
diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
new file mode 100644
index 000000000000..68e5e428e8f6
--- /dev/null
+++ b/drivers/mmc/host/dw_mmc-k3.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2013 Linaro Ltd.
+ * Copyright (c) 2013 Hisilicon Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/dw_mmc.h>
+#include <linux/of_address.h>
+
+#include "dw_mmc.h"
+#include "dw_mmc-pltfm.h"
+
+#define MAX_NUMS        10
+struct dw_mci_k3_priv_data {
+        u32     clk_table[MAX_NUMS];
+};
+
+static void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios)
+{
+        struct dw_mci_k3_priv_data *priv = host->priv;
+        u32 rate = priv->clk_table[ios->timing];
+        int ret;
+
+        if (!rate) {
+                dev_warn(host->dev,
+                        "no specified rate in timing %u\n", ios->timing);
+                return;
+        }
+
+        ret = clk_set_rate(host->ciu_clk, rate);
+        if (ret)
+                dev_warn(host->dev, "failed to set clock rate %uHz\n", rate);
+
+        host->bus_hz = clk_get_rate(host->ciu_clk);
+}
+
+static int dw_mci_k3_parse_dt(struct dw_mci *host)
+{
+        struct dw_mci_k3_priv_data *priv;
+        struct device_node *node = host->dev->of_node;
+        struct property *prop;
+        const __be32 *cur;
+        u32 val, num = 0;
+
+        priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
+        if (!priv) {
+                dev_err(host->dev, "mem alloc failed for private data\n");
+                return -ENOMEM;
+        }
+        host->priv = priv;
+
+        of_property_for_each_u32(node, "clock-freq-table", prop, cur, val) {
+                if (num >= MAX_NUMS)
+                        break;
+                priv->clk_table[num++] = val;
+        }
+        return 0;
+}
+
+static const struct dw_mci_drv_data k3_drv_data = {
+        .set_ios                = dw_mci_k3_set_ios,
+        .parse_dt               = dw_mci_k3_parse_dt,
+};
+
+static const struct of_device_id dw_mci_k3_match[] = {
+        { .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, },
+        {},
+};
+MODULE_DEVICE_TABLE(of, dw_mci_k3_match);
+
+static int dw_mci_k3_probe(struct platform_device *pdev)
+{
+        const struct dw_mci_drv_data *drv_data;
+        const struct of_device_id *match;
+
+        match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
+        drv_data = match->data;
+
+        return dw_mci_pltfm_register(pdev, drv_data);
+}
+
+static int dw_mci_k3_suspend(struct device *dev)
+{
+        struct dw_mci *host = dev_get_drvdata(dev);
+        int ret;
+
+        ret = dw_mci_suspend(host);
+        if (!ret)
+                clk_disable_unprepare(host->ciu_clk);
+
+        return ret;
+}
+
+static int dw_mci_k3_resume(struct device *dev)
+{
+        struct dw_mci *host = dev_get_drvdata(dev);
+        int ret;
+
+        ret = clk_prepare_enable(host->ciu_clk);
+        if (ret) {
+                dev_err(host->dev, "failed to enable ciu clock\n");
+                return ret;
+        }
+
+        return dw_mci_resume(host);
+}
+
+SIMPLE_DEV_PM_OPS(dw_mci_k3_pmops, dw_mci_k3_suspend, dw_mci_k3_resume);
+
+static struct platform_driver dw_mci_k3_pltfm_driver = {
+        .probe          = dw_mci_k3_probe,
+        .remove         = dw_mci_pltfm_remove,
+        .driver         = {
+                .name           = "dwmmc_k3",
+                .of_match_table = dw_mci_k3_match,
+                .pm             = &dw_mci_k3_pmops,
+        },
+};
+
+module_platform_driver(dw_mci_k3_pltfm_driver);
+
+MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:dwmmc-k3");