usb: chipidea: add imx platform driver

This patch supports only the host-mode functionality so far.

Signed-off-by: Richard Zhao <richard.zhao@freescale.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Peter Chen <peter.chen@freescale.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Felipe Balbi <balbi@ti.com>
Tested-by: Subodh Nijsure <snijsure@grid-net.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 201 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
index b69900a62a4d..5c66d9c330ca 100644
--- a/drivers/usb/chipidea/Makefile
+++ b/drivers/usb/chipidea/Makefile
@@ -14,3 +14,6 @@ ifneq ($(CONFIG_PCI),)
         obj-$(CONFIG_USB_CHIPIDEA)      += ci13xxx_pci.o
 endif
 
+ifneq ($(CONFIG_OF_DEVICE),)
+        obj-$(CONFIG_USB_CHIPIDEA)      += ci13xxx_imx.o
+endif
diff --git a/drivers/usb/chipidea/ci13xxx_imx.c b/drivers/usb/chipidea/ci13xxx_imx.c
new file mode 100644
index 000000000000..ef60d06835d0
--- /dev/null
+++ b/drivers/usb/chipidea/ci13xxx_imx.c
@@ -0,0 +1,198 @@
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ * Copyright (C) 2012 Marek Vasut <marex@denx.de>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/dma-mapping.h>
+#include <linux/usb/chipidea.h>
+#include <linux/clk.h>
+#include <linux/regulator/consumer.h>
+
+#include "ci.h"
+
+#define pdev_to_phy(pdev) \
+        ((struct usb_phy *)platform_get_drvdata(pdev))
+
+struct ci13xxx_imx_data {
+        struct device_node *phy_np;
+        struct usb_phy *phy;
+        struct platform_device *ci_pdev;
+        struct clk *clk;
+        struct regulator *reg_vbus;
+};
+
+static struct ci13xxx_platform_data ci13xxx_imx_platdata __devinitdata  = {
+        .name                   = "ci13xxx_imx",
+        .flags                  = CI13XXX_REQUIRE_TRANSCEIVER |
+                                  CI13XXX_PULLUP_ON_VBUS |
+                                  CI13XXX_DISABLE_STREAMING,
+        .capoffset              = DEF_CAPOFFSET,
+};
+
+static int __devinit ci13xxx_imx_probe(struct platform_device *pdev)
+{
+        struct ci13xxx_imx_data *data;
+        struct platform_device *plat_ci, *phy_pdev;
+        struct device_node *phy_np;
+        struct resource *res;
+        struct regulator *reg_vbus;
+        int ret;
+
+        data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+        if (!data) {
+                dev_err(&pdev->dev, "Failed to allocate CI13xxx-IMX data!\n");
+                return -ENOMEM;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "Can't get device resources!\n");
+                return -ENOENT;
+        }
+
+        data->clk = devm_clk_get(&pdev->dev, NULL);
+        if (IS_ERR(data->clk)) {
+                dev_err(&pdev->dev,
+                        "Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
+                return PTR_ERR(data->clk);
+        }
+
+        ret = clk_prepare_enable(data->clk);
+        if (ret) {
+                dev_err(&pdev->dev,
+                        "Failed to prepare or enable clock, err=%d\n", ret);
+                return ret;
+        }
+
+        phy_np = of_parse_phandle(pdev->dev.of_node, "fsl,usbphy", 0);
+        if (phy_np) {
+                data->phy_np = phy_np;
+                phy_pdev = of_find_device_by_node(phy_np);
+                if (phy_pdev) {
+                        struct usb_phy *phy;
+                        phy = pdev_to_phy(phy_pdev);
+                        if (phy &&
+                            try_module_get(phy_pdev->dev.driver->owner)) {
+                                usb_phy_init(phy);
+                                data->phy = phy;
+                        }
+                }
+        }
+
+        /* we only support host now, so enable vbus here */
+        reg_vbus = devm_regulator_get(&pdev->dev, "vbus");
+        if (!IS_ERR(reg_vbus)) {
+                ret = regulator_enable(reg_vbus);
+                if (ret) {
+                        dev_err(&pdev->dev,
+                                "Failed to enable vbus regulator, err=%d\n",
+                                ret);
+                        goto put_np;
+                }
+                data->reg_vbus = reg_vbus;
+        } else {
+                reg_vbus = NULL;
+        }
+
+        ci13xxx_imx_platdata.phy = data->phy;
+
+        if (!pdev->dev.dma_mask) {
+                pdev->dev.dma_mask = devm_kzalloc(&pdev->dev,
+                                      sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
+                if (!pdev->dev.dma_mask) {
+                        ret = -ENOMEM;
+                        dev_err(&pdev->dev, "Failed to alloc dma_mask!\n");
+                        goto err;
+                }
+                *pdev->dev.dma_mask = DMA_BIT_MASK(32);
+                dma_set_coherent_mask(&pdev->dev, *pdev->dev.dma_mask);
+        }
+        plat_ci = ci13xxx_add_device(&pdev->dev,
+                                pdev->resource, pdev->num_resources,
+                                &ci13xxx_imx_platdata);
+        if (IS_ERR(plat_ci)) {
+                ret = PTR_ERR(plat_ci);
+                dev_err(&pdev->dev,
+                        "Can't register ci_hdrc platform device, err=%d\n",
+                        ret);
+                goto err;
+        }
+
+        data->ci_pdev = plat_ci;
+        platform_set_drvdata(pdev, data);
+
+        pm_runtime_no_callbacks(&pdev->dev);
+        pm_runtime_enable(&pdev->dev);
+
+        return 0;
+
+err:
+        if (reg_vbus)
+                regulator_disable(reg_vbus);
+put_np:
+        if (phy_np)
+                of_node_put(phy_np);
+        clk_disable_unprepare(data->clk);
+        return ret;
+}
+
+static int __devexit ci13xxx_imx_remove(struct platform_device *pdev)
+{
+        struct ci13xxx_imx_data *data = platform_get_drvdata(pdev);
+
+        pm_runtime_disable(&pdev->dev);
+        ci13xxx_remove_device(data->ci_pdev);
+
+        if (data->reg_vbus)
+                regulator_disable(data->reg_vbus);
+
+        if (data->phy) {
+                usb_phy_shutdown(data->phy);
+                module_put(data->phy->dev->driver->owner);
+        }
+
+        of_node_put(data->phy_np);
+
+        clk_disable_unprepare(data->clk);
+
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+static const struct of_device_id ci13xxx_imx_dt_ids[] = {
+        { .compatible = "fsl,imx27-usb", },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ci13xxx_imx_dt_ids);
+
+static struct platform_driver ci13xxx_imx_driver = {
+        .probe = ci13xxx_imx_probe,
+        .remove = __devexit_p(ci13xxx_imx_remove),
+        .driver = {
+                .name = "imx_usb",
+                .owner = THIS_MODULE,
+                .of_match_table = ci13xxx_imx_dt_ids,
+         },
+};
+
+module_platform_driver(ci13xxx_imx_driver);
+
+MODULE_ALIAS("platform:imx-usb");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("CI13xxx i.MX USB binding");
+MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
+MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");