USB: chipidea: add imx usbmisc support

i.MX usb controllers share non-core registers, which may include
SoC specific controls. We turn it into a usbmisc device and usbmisc
driver set operations needed by ci13xxx_imx driver.

For example, Sabrelite board has bad over-current design, we can
usbmisc to disable over-current detection.

Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Richard Zhao <richard.zhao@freescale.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

6 files changed, 274 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt b/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
index 2c290418bb2d..5778b9c83bd8 100644
--- a/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
+++ b/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
@@ -7,7 +7,10 @@ Required properties:
 
 Optional properties:
 - fsl,usbphy: phandler of usb phy that connects to the only one port
+- fsl,usbmisc: phandler of non-core register device, with one argument
+  that indicate usb controller index
 - vbus-supply: regulator for vbus
+- disable-over-current: disable over current detect
 
 Examples:
 usb@02184000 { /* USB OTG */
@@ -15,4 +18,6 @@ usb@02184000 { /* USB OTG */
         reg = <0x02184000 0x200>;
         interrupts = <0 43 0x04>;
         fsl,usbphy = <&usbphy1>;
+        fsl,usbmisc = <&usbmisc 0>;
+        disable-over-current;
 };
diff --git a/Documentation/devicetree/bindings/usb/usbmisc-imx.txt b/Documentation/devicetree/bindings/usb/usbmisc-imx.txt
new file mode 100644
index 000000000000..97ce94e1a6cc
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/usbmisc-imx.txt
@@ -0,0 +1,14 @@
+* Freescale i.MX non-core registers
+
+Required properties:
+- #index-cells: Cells used to descibe usb controller index. Should be <1>
+- compatible: Should be one of below:
+        "fsl,imx6q-usbmisc" for imx6q
+- reg: Should contain registers location and length
+
+Examples:
+usbmisc@02184800 {
+        #index-cells = <1>;
+        compatible = "fsl,imx6q-usbmisc";
+        reg = <0x02184800 0x200>;
+};
diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
index 5c66d9c330ca..57e510f6c245 100644
--- a/drivers/usb/chipidea/Makefile
+++ b/drivers/usb/chipidea/Makefile
@@ -15,5 +15,5 @@ ifneq ($(CONFIG_PCI),)
 endif
 
 ifneq ($(CONFIG_OF_DEVICE),)
-        obj-$(CONFIG_USB_CHIPIDEA)      += ci13xxx_imx.o
+        obj-$(CONFIG_USB_CHIPIDEA)      += ci13xxx_imx.o usbmisc_imx6q.o
 endif
diff --git a/drivers/usb/chipidea/ci13xxx_imx.c b/drivers/usb/chipidea/ci13xxx_imx.c
index ef60d06835d0..96ac67bbd2db 100644
--- a/drivers/usb/chipidea/ci13xxx_imx.c
+++ b/drivers/usb/chipidea/ci13xxx_imx.c
@@ -22,6 +22,7 @@
 #include <linux/regulator/consumer.h>
 
 #include "ci.h"
+#include "ci13xxx_imx.h"
 
 #define pdev_to_phy(pdev) \
         ((struct usb_phy *)platform_get_drvdata(pdev))
@@ -34,6 +35,55 @@ struct ci13xxx_imx_data {
         struct regulator *reg_vbus;
 };
 
+static const struct usbmisc_ops *usbmisc_ops;
+
+/* Common functions shared by usbmisc drivers */
+
+int usbmisc_set_ops(const struct usbmisc_ops *ops)
+{
+        if (usbmisc_ops)
+                return -EBUSY;
+
+        usbmisc_ops = ops;
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(usbmisc_set_ops);
+
+void usbmisc_unset_ops(const struct usbmisc_ops *ops)
+{
+        usbmisc_ops = NULL;
+}
+EXPORT_SYMBOL_GPL(usbmisc_unset_ops);
+
+int usbmisc_get_init_data(struct device *dev, struct usbmisc_usb_device *usbdev)
+{
+        struct device_node *np = dev->of_node;
+        struct of_phandle_args args;
+        int ret;
+
+        usbdev->dev = dev;
+
+        ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells",
+                                        0, &args);
+        if (ret) {
+                dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n",
+                        ret);
+                memset(usbdev, 0, sizeof(*usbdev));
+                return ret;
+        }
+        usbdev->index = args.args[0];
+        of_node_put(args.np);
+
+        if (of_find_property(np, "disable-over-current", NULL))
+                usbdev->disable_oc = 1;
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(usbmisc_get_init_data);
+
+/* End of common functions shared by usbmisc drivers*/
+
 static struct ci13xxx_platform_data ci13xxx_imx_platdata __devinitdata  = {
         .name                   = "ci13xxx_imx",
         .flags                  = CI13XXX_REQUIRE_TRANSCEIVER |
@@ -51,6 +101,10 @@ static int __devinit ci13xxx_imx_probe(struct platform_device *pdev)
         struct regulator *reg_vbus;
         int ret;
 
+        if (of_find_property(pdev->dev.of_node, "fsl,usbmisc", NULL)
+                && !usbmisc_ops)
+                return -EPROBE_DEFER;
+
         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
         if (!data) {
                 dev_err(&pdev->dev, "Failed to allocate CI13xxx-IMX data!\n");
@@ -120,6 +174,16 @@ static int __devinit ci13xxx_imx_probe(struct platform_device *pdev)
                 *pdev->dev.dma_mask = DMA_BIT_MASK(32);
                 dma_set_coherent_mask(&pdev->dev, *pdev->dev.dma_mask);
         }
+
+        if (usbmisc_ops && usbmisc_ops->init) {
+                ret = usbmisc_ops->init(&pdev->dev);
+                if (ret) {
+                        dev_err(&pdev->dev,
+                                "usbmisc init failed, ret=%d\n", ret);
+                        goto err;
+                }
+        }
+
         plat_ci = ci13xxx_add_device(&pdev->dev,
                                 pdev->resource, pdev->num_resources,
                                 &ci13xxx_imx_platdata);
diff --git a/drivers/usb/chipidea/ci13xxx_imx.h b/drivers/usb/chipidea/ci13xxx_imx.h
new file mode 100644
index 000000000000..2e88accb3d67
--- /dev/null
+++ b/drivers/usb/chipidea/ci13xxx_imx.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ *
+ * 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
+ */
+
+/* Used to set SoC specific callbacks */
+struct usbmisc_ops {
+        /* It's called once when probe a usb device */
+        int (*init)(struct device *dev);
+};
+
+struct usbmisc_usb_device {
+        struct device *dev; /* usb controller device */
+        int index;
+
+        int disable_oc:1; /* over current detect disabled */
+};
+
+int usbmisc_set_ops(const struct usbmisc_ops *ops);
+void usbmisc_unset_ops(const struct usbmisc_ops *ops);
+int
+usbmisc_get_init_data(struct device *dev, struct usbmisc_usb_device *usbdev);
diff --git a/drivers/usb/chipidea/usbmisc_imx6q.c b/drivers/usb/chipidea/usbmisc_imx6q.c
new file mode 100644
index 000000000000..416e3fc58fd0
--- /dev/null
+++ b/drivers/usb/chipidea/usbmisc_imx6q.c
@@ -0,0 +1,162 @@
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ *
+ * 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/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#include "ci13xxx_imx.h"
+
+#define USB_DEV_MAX 4
+
+#define BM_OVER_CUR_DIS         BIT(7)
+
+struct imx6q_usbmisc {
+        void __iomem *base;
+        spinlock_t lock;
+        struct clk *clk;
+        struct usbmisc_usb_device usbdev[USB_DEV_MAX];
+};
+
+static struct imx6q_usbmisc *usbmisc;
+
+static struct usbmisc_usb_device *get_usbdev(struct device *dev)
+{
+        int i, ret;
+
+        for (i = 0; i < USB_DEV_MAX; i++) {
+                if (usbmisc->usbdev[i].dev == dev)
+                        return &usbmisc->usbdev[i];
+                else if (!usbmisc->usbdev[i].dev)
+                        break;
+        }
+
+        if (i >= USB_DEV_MAX)
+                return ERR_PTR(-EBUSY);
+
+        ret = usbmisc_get_init_data(dev, &usbmisc->usbdev[i]);
+        if (ret)
+                return ERR_PTR(ret);
+
+        return &usbmisc->usbdev[i];
+}
+
+static int usbmisc_imx6q_init(struct device *dev)
+{
+
+        struct usbmisc_usb_device *usbdev;
+        unsigned long flags;
+        u32 reg;
+
+        usbdev = get_usbdev(dev);
+        if (IS_ERR(usbdev))
+                return PTR_ERR(usbdev);
+
+        if (usbdev->disable_oc) {
+                spin_lock_irqsave(&usbmisc->lock, flags);
+                reg = readl(usbmisc->base + usbdev->index * 4);
+                writel(reg | BM_OVER_CUR_DIS,
+                        usbmisc->base + usbdev->index * 4);
+                spin_unlock_irqrestore(&usbmisc->lock, flags);
+        }
+
+        return 0;
+}
+
+static const struct usbmisc_ops imx6q_usbmisc_ops = {
+        .init = usbmisc_imx6q_init,
+};
+
+static const struct of_device_id usbmisc_imx6q_dt_ids[] = {
+        { .compatible = "fsl,imx6q-usbmisc"},
+        { /* sentinel */ }
+};
+
+static int __devinit usbmisc_imx6q_probe(struct platform_device *pdev)
+{
+        struct resource *res;
+        struct imx6q_usbmisc *data;
+        int ret;
+
+        if (usbmisc)
+                return -EBUSY;
+
+        data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+        if (!data)
+                return -ENOMEM;
+
+        spin_lock_init(&data->lock);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        data->base = devm_request_and_ioremap(&pdev->dev, res);
+        if (!data->base)
+                return -EADDRNOTAVAIL;
+
+        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,
+                        "clk_prepare_enable failed, err=%d\n", ret);
+                return ret;
+        }
+
+        ret = usbmisc_set_ops(&imx6q_usbmisc_ops);
+        if (ret) {
+                clk_disable_unprepare(data->clk);
+                return ret;
+        }
+
+        usbmisc = data;
+
+        return 0;
+}
+
+static int __devexit usbmisc_imx6q_remove(struct platform_device *pdev)
+{
+        usbmisc_unset_ops(&imx6q_usbmisc_ops);
+        clk_disable_unprepare(usbmisc->clk);
+        return 0;
+}
+
+static struct platform_driver usbmisc_imx6q_driver = {
+        .probe = usbmisc_imx6q_probe,
+        .remove = __devexit_p(usbmisc_imx6q_remove),
+        .driver = {
+                .name = "usbmisc_imx6q",
+                .owner = THIS_MODULE,
+                .of_match_table = usbmisc_imx6q_dt_ids,
+         },
+};
+
+int __init usbmisc_imx6q_drv_init(void)
+{
+        return platform_driver_register(&usbmisc_imx6q_driver);
+}
+subsys_initcall(usbmisc_imx6q_drv_init);
+
+void __exit usbmisc_imx6q_drv_exit(void)
+{
+        platform_driver_unregister(&usbmisc_imx6q_driver);
+}
+module_exit(usbmisc_imx6q_drv_exit);
+
+MODULE_ALIAS("platform:usbmisc-imx6q");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("driver for imx6q usb non-core registers");
+MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");