USB: ehci-tegra: add probing through device tree

Rely on platform_data being passed through auxdata for now; more elaborate
bindings for phy config and tunings to be added.

v2: moved vbus-gpio check to the helper function, added check for !of_node,
    added usb2 clock to board-dt table.

Signed-off-by: Olof Johansson <olof@lixom.net>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 71 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index db9d1b4bfbdc..dbc7fe8ca9e7 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -21,7 +21,12 @@
 #include <linux/platform_data/tegra_usb.h>
 #include <linux/irq.h>
 #include <linux/usb/otg.h>
+#include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+
 #include <mach/usb_phy.h>
+#include <mach/iomap.h>
 
 #define TEGRA_USB_DMA_ALIGN 32
 
@@ -574,6 +579,35 @@ static const struct hc_driver tegra_ehci_hc_driver = {
         .port_handed_over       = ehci_port_handed_over,
 };
 
+static int setup_vbus_gpio(struct platform_device *pdev)
+{
+        int err = 0;
+        int gpio;
+
+        if (!pdev->dev.of_node)
+                return 0;
+
+        gpio = of_get_named_gpio(pdev->dev.of_node, "nvidia,vbus-gpio", 0);
+        if (!gpio_is_valid(gpio))
+                return 0;
+
+        err = gpio_request(gpio, "vbus_gpio");
+        if (err) {
+                dev_err(&pdev->dev, "can't request vbus gpio %d", gpio);
+                return err;
+        }
+        err = gpio_direction_output(gpio, 1);
+        if (err) {
+                dev_err(&pdev->dev, "can't enable vbus\n");
+                return err;
+        }
+        gpio_set_value(gpio, 1);
+
+        return err;
+}
+
+static u64 tegra_ehci_dma_mask = DMA_BIT_MASK(32);
+
 static int tegra_ehci_probe(struct platform_device *pdev)
 {
         struct resource *res;
@@ -590,6 +624,15 @@ static int tegra_ehci_probe(struct platform_device *pdev)
                 return -EINVAL;
         }
 
+        /* 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 = &tegra_ehci_dma_mask;
+
+        setup_vbus_gpio(pdev);
+
         tegra = kzalloc(sizeof(struct tegra_ehci_hcd), GFP_KERNEL);
         if (!tegra)
                 return -ENOMEM;
@@ -640,6 +683,28 @@ static int tegra_ehci_probe(struct platform_device *pdev)
                 goto fail_io;
         }
 
+        /* This is pretty ugly and needs to be fixed when we do only
+         * device-tree probing. Old code relies on the platform_device
+         * numbering that we lack for device-tree-instantiated devices.
+         */
+        if (instance < 0) {
+                switch (res->start) {
+                case TEGRA_USB_BASE:
+                        instance = 0;
+                        break;
+                case TEGRA_USB2_BASE:
+                        instance = 1;
+                        break;
+                case TEGRA_USB3_BASE:
+                        instance = 2;
+                        break;
+                default:
+                        err = -ENODEV;
+                        dev_err(&pdev->dev, "unknown usb instance\n");
+                        goto fail_phy;
+                }
+        }
+
         tegra->phy = tegra_usb_phy_open(instance, hcd->regs, pdata->phy_config,
                                                 TEGRA_USB_PHY_MODE_HOST);
         if (IS_ERR(tegra->phy)) {
@@ -773,6 +838,11 @@ static void tegra_ehci_hcd_shutdown(struct platform_device *pdev)
                 hcd->driver->shutdown(hcd);
 }
 
+static struct of_device_id tegra_ehci_of_match[] __devinitdata = {
+        { .compatible = "nvidia,tegra20-ehci", },
+        { },
+};
+
 static struct platform_driver tegra_ehci_driver = {
         .probe          = tegra_ehci_probe,
         .remove         = tegra_ehci_remove,
@@ -783,5 +853,6 @@ static struct platform_driver tegra_ehci_driver = {
         .shutdown       = tegra_ehci_hcd_shutdown,
         .driver         = {
                 .name   = "tegra-ehci",
+                .of_match_table = tegra_ehci_of_match,
         }
 };