1 files changed, 146 insertions, 38 deletions

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index 8e855eb0bf89..09f597ad6e00 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -14,6 +14,8 @@
 
 #include <linux/clk.h>
 #include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
 
 #include <mach/hardware.h>
 #include <asm/gpio.h>
@@ -25,6 +27,10 @@
 #error "CONFIG_ARCH_AT91 must be defined."
 #endif
 
+#define valid_port(index)       ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
+#define at91_for_each_port(index)       \
+                for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
+
 /* interface and function clocks; sometimes also an AHB clock */
 static struct clk *iclk, *fclk, *hclk;
 static int clocked;
@@ -238,26 +244,26 @@ ohci_at91_start (struct usb_hcd *hcd)
 
 static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
 {
-        if (port < 0 || port >= 2)
+        if (!valid_port(port))
                 return;
 
         if (!gpio_is_valid(pdata->vbus_pin[port]))
                 return;
 
         gpio_set_value(pdata->vbus_pin[port],
-                       !pdata->vbus_pin_active_low[port] ^ enable);
+                       pdata->vbus_pin_active_low[port] ^ enable);
 }
 
 static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
 {
-        if (port < 0 || port >= 2)
+        if (!valid_port(port))
                 return -EINVAL;
 
         if (!gpio_is_valid(pdata->vbus_pin[port]))
                 return -EINVAL;
 
         return gpio_get_value(pdata->vbus_pin[port]) ^
-                !pdata->vbus_pin_active_low[port];
+                pdata->vbus_pin_active_low[port];
 }
 
 /*
@@ -269,9 +275,9 @@ static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
         int length = ohci_hub_status_data(hcd, buf);
         int port;
 
-        for (port = 0; port < ARRAY_SIZE(pdata->overcurrent_pin); port++) {
+        at91_for_each_port(port) {
                 if (pdata->overcurrent_changed[port]) {
-                        if (! length)
+                        if (!length)
                                 length = 1;
                         buf[0] |= 1 << (port + 1);
                 }
@@ -295,11 +301,17 @@ static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                 "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
                 hcd, typeReq, wValue, wIndex, buf, wLength);
 
+        wIndex--;
+
         switch (typeReq) {
         case SetPortFeature:
                 if (wValue == USB_PORT_FEAT_POWER) {
                         dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
-                        ohci_at91_usb_set_power(pdata, wIndex - 1, 1);
+                        if (valid_port(wIndex)) {
+                                ohci_at91_usb_set_power(pdata, wIndex, 1);
+                                ret = 0;
+                        }
+
                         goto out;
                 }
                 break;
@@ -310,9 +322,9 @@ static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                         dev_dbg(hcd->self.controller,
                                 "ClearPortFeature: C_OVER_CURRENT\n");
 
-                        if (wIndex == 1 || wIndex == 2) {
-                                pdata->overcurrent_changed[wIndex-1] = 0;
-                                pdata->overcurrent_status[wIndex-1] = 0;
+                        if (valid_port(wIndex)) {
+                                pdata->overcurrent_changed[wIndex] = 0;
+                                pdata->overcurrent_status[wIndex] = 0;
                         }
 
                         goto out;
@@ -321,9 +333,8 @@ static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                         dev_dbg(hcd->self.controller,
                                 "ClearPortFeature: OVER_CURRENT\n");
 
-                        if (wIndex == 1 || wIndex == 2) {
-                                pdata->overcurrent_status[wIndex-1] = 0;
-                        }
+                        if (valid_port(wIndex))
+                                pdata->overcurrent_status[wIndex] = 0;
 
                         goto out;
 
@@ -331,15 +342,15 @@ static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                         dev_dbg(hcd->self.controller,
                                 "ClearPortFeature: POWER\n");
 
-                        if (wIndex == 1 || wIndex == 2) {
-                                ohci_at91_usb_set_power(pdata, wIndex - 1, 0);
+                        if (valid_port(wIndex)) {
+                                ohci_at91_usb_set_power(pdata, wIndex, 0);
                                 return 0;
                         }
                 }
                 break;
         }
 
-        ret = ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
+        ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
         if (ret)
                 goto out;
 
@@ -375,18 +386,15 @@ static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 
                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
 
-                if (wIndex == 1 || wIndex == 2) {
-                        if (! ohci_at91_usb_get_power(pdata, wIndex-1)) {
+                if (valid_port(wIndex)) {
+                        if (!ohci_at91_usb_get_power(pdata, wIndex))
                                 *data &= ~cpu_to_le32(RH_PS_PPS);
-                        }
 
-                        if (pdata->overcurrent_changed[wIndex-1]) {
+                        if (pdata->overcurrent_changed[wIndex])
                                 *data |= cpu_to_le32(RH_PS_OCIC);
-                        }
 
-                        if (pdata->overcurrent_status[wIndex-1]) {
+                        if (pdata->overcurrent_status[wIndex])
                                 *data |= cpu_to_le32(RH_PS_POCI);
-                        }
                 }
         }
 
@@ -448,14 +456,14 @@ static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
 
         /* From the GPIO notifying the over-current situation, find
          * out the corresponding port */
-        for (port = 0; port < ARRAY_SIZE(pdata->overcurrent_pin); port++) {
+        at91_for_each_port(port) {
                 if (gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
                         gpio = pdata->overcurrent_pin[port];
                         break;
                 }
         }
 
-        if (port == ARRAY_SIZE(pdata->overcurrent_pin)) {
+        if (port == AT91_MAX_USBH_PORTS) {
                 dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
                 return IRQ_HANDLED;
         }
@@ -465,7 +473,7 @@ static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
         /* When notified of an over-current situation, disable power
            on the corresponding port, and mark this port in
            over-current. */
-        if (! val) {
+        if (!val) {
                 ohci_at91_usb_set_power(pdata, port, 0);
                 pdata->overcurrent_status[port]  = 1;
                 pdata->overcurrent_changed[port] = 1;
@@ -477,34 +485,133 @@ static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
         return IRQ_HANDLED;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id at91_ohci_dt_ids[] = {
+        { .compatible = "atmel,at91rm9200-ohci" },
+        { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
+
+static u64 at91_ohci_dma_mask = DMA_BIT_MASK(32);
+
+static int __devinit ohci_at91_of_init(struct platform_device *pdev)
+{
+        struct device_node *np = pdev->dev.of_node;
+        int i, gpio;
+        enum of_gpio_flags flags;
+        struct at91_usbh_data   *pdata;
+        u32 ports;
+
+        if (!np)
+                return 0;
+
+        /* Right now device-tree probed devices don't get dma_mask set.
+         * Since shared usb code relies on it, set it here for now.
+         * Once we have dma capability bindings this can go away.
+         */
+        if (!pdev->dev.dma_mask)
+                pdev->dev.dma_mask = &at91_ohci_dma_mask;
+
+        pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                return -ENOMEM;
+
+        if (!of_property_read_u32(np, "num-ports", &ports))
+                pdata->ports = ports;
+
+        at91_for_each_port(i) {
+                gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
+                pdata->vbus_pin[i] = gpio;
+                if (!gpio_is_valid(gpio))
+                        continue;
+                pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
+        }
+
+        at91_for_each_port(i)
+                pdata->overcurrent_pin[i] =
+                        of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
+
+        pdev->dev.platform_data = pdata;
+
+        return 0;
+}
+#else
+static int __devinit ohci_at91_of_init(struct platform_device *pdev)
+{
+        return 0;
+}
+#endif
+
 /*-------------------------------------------------------------------------*/
 
 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
 {
-        struct at91_usbh_data   *pdata = pdev->dev.platform_data;
+        struct at91_usbh_data   *pdata;
         int                     i;
+        int                     gpio;
+        int                     ret;
+
+        ret = ohci_at91_of_init(pdev);
+        if (ret)
+                return ret;
+
+        pdata = pdev->dev.platform_data;
 
         if (pdata) {
-                for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) {
+                at91_for_each_port(i) {
                         if (!gpio_is_valid(pdata->vbus_pin[i]))
                                 continue;
-                        gpio_request(pdata->vbus_pin[i], "ohci_vbus");
+                        gpio = pdata->vbus_pin[i];
+
+                        ret = gpio_request(gpio, "ohci_vbus");
+                        if (ret) {
+                                dev_err(&pdev->dev,
+                                        "can't request vbus gpio %d\n", gpio);
+                                continue;
+                        }
+                        ret = gpio_direction_output(gpio,
+                                                !pdata->vbus_pin_active_low[i]);
+                        if (ret) {
+                                dev_err(&pdev->dev,
+                                        "can't put vbus gpio %d as output %d\n",
+                                        gpio, !pdata->vbus_pin_active_low[i]);
+                                gpio_free(gpio);
+                                continue;
+                        }
+
                         ohci_at91_usb_set_power(pdata, i, 1);
                 }
 
-                for (i = 0; i < ARRAY_SIZE(pdata->overcurrent_pin); i++) {
-                        int ret;
-
+                at91_for_each_port(i) {
                         if (!gpio_is_valid(pdata->overcurrent_pin[i]))
                                 continue;
-                        gpio_request(pdata->overcurrent_pin[i], "ohci_overcurrent");
+                        gpio = pdata->overcurrent_pin[i];
+
+                        ret = gpio_request(gpio, "ohci_overcurrent");
+                        if (ret) {
+                                dev_err(&pdev->dev,
+                                        "can't request overcurrent gpio %d\n",
+                                        gpio);
+                                continue;
+                        }
+
+                        ret = gpio_direction_input(gpio);
+                        if (ret) {
+                                dev_err(&pdev->dev,
+                                        "can't configure overcurrent gpio %d as input\n",
+                                        gpio);
+                                gpio_free(gpio);
+                                continue;
+                        }
 
-                        ret = request_irq(gpio_to_irq(pdata->overcurrent_pin[i]),
+                        ret = request_irq(gpio_to_irq(gpio),
                                           ohci_hcd_at91_overcurrent_irq,
                                           IRQF_SHARED, "ohci_overcurrent", pdev);
                         if (ret) {
-                                gpio_free(pdata->overcurrent_pin[i]);
-                                dev_warn(& pdev->dev, "cannot get GPIO IRQ for overcurrent\n");
+                                gpio_free(gpio);
+                                dev_err(&pdev->dev,
+                                        "can't get gpio IRQ for overcurrent\n");
                         }
                 }
         }
@@ -519,14 +626,14 @@ static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
         int                     i;
 
         if (pdata) {
-                for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) {
+                at91_for_each_port(i) {
                         if (!gpio_is_valid(pdata->vbus_pin[i]))
                                 continue;
                         ohci_at91_usb_set_power(pdata, i, 0);
                         gpio_free(pdata->vbus_pin[i]);
                 }
 
-                for (i = 0; i < ARRAY_SIZE(pdata->overcurrent_pin); i++) {
+                at91_for_each_port(i) {
                         if (!gpio_is_valid(pdata->overcurrent_pin[i]))
                                 continue;
                         free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev);
@@ -596,5 +703,6 @@ static struct platform_driver ohci_hcd_at91_driver = {
         .driver         = {
                 .name   = "at91_ohci",
                 .owner  = THIS_MODULE,
+                .of_match_table = of_match_ptr(at91_ohci_dt_ids),
         },
 };