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authorArnd Bergmann <arnd@arndb.de>2013-03-27 21:44:22 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-28 11:22:15 -0700
commitf3bc64d6d1f21c1b92d75f233a37b75d77af6963 (patch)
treedd21f8705b9fa4661edef271a59651882a624a87 /drivers/usb/host/ehci-platform.c
parent4d053fdac3c44ec8c7a78c810292a156abf84971 (diff)
USB: EHCI: DT support for generic bus glue
This lets us use the ehci-platform driver on platforms without special requirements for their ehci controllers. In particular, this is true for the vt8500/wm8x50 platforms, which currently have a separate driver that causes problems with multiplatform configurations. Tested-by: Tony Prisk <linux@prisktech.co.nz> Tested-by: Peter Vasil <petervasil@gmail.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/ehci-platform.c')
-rw-r--r--drivers/usb/host/ehci-platform.c34
1 files changed, 28 insertions, 6 deletions
diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index ca750639054..cda0fa9613e 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -18,11 +18,13 @@
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
+#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/hrtimer.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
@@ -62,22 +64,32 @@ static const struct ehci_driver_overrides platform_overrides __initdata = {
.reset = ehci_platform_reset,
};
+static struct usb_ehci_pdata ehci_platform_defaults;
+
static int ehci_platform_probe(struct platform_device *dev)
{
struct usb_hcd *hcd;
struct resource *res_mem;
- struct usb_ehci_pdata *pdata = dev->dev.platform_data;
+ struct usb_ehci_pdata *pdata;
int irq;
int err = -ENOMEM;
- if (!pdata) {
- WARN_ON(1);
- return -ENODEV;
- }
-
if (usb_disabled())
return -ENODEV;
+ /*
+ * use reasonable defaults so platforms don't have to provide these.
+ * with DT probing on ARM, none of these are set.
+ */
+ if (!dev->dev.platform_data)
+ dev->dev.platform_data = &ehci_platform_defaults;
+ if (!dev->dev.dma_mask)
+ dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
+ if (!dev->dev.coherent_dma_mask)
+ dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+
+ pdata = dev->dev.platform_data;
+
irq = platform_get_irq(dev, 0);
if (irq < 0) {
dev_err(&dev->dev, "no irq provided");
@@ -139,6 +151,9 @@ static int ehci_platform_remove(struct platform_device *dev)
if (pdata->power_off)
pdata->power_off(dev);
+ if (pdata == &ehci_platform_defaults)
+ dev->dev.platform_data = NULL;
+
return 0;
}
@@ -183,6 +198,12 @@ static int ehci_platform_resume(struct device *dev)
#define ehci_platform_resume NULL
#endif /* CONFIG_PM */
+static const struct of_device_id vt8500_ehci_ids[] = {
+ { .compatible = "via,vt8500-ehci", },
+ { .compatible = "wm,prizm-ehci", },
+ {}
+};
+
static const struct platform_device_id ehci_platform_table[] = {
{ "ehci-platform", 0 },
{ }
@@ -203,6 +224,7 @@ static struct platform_driver ehci_platform_driver = {
.owner = THIS_MODULE,
.name = "ehci-platform",
.pm = &ehci_platform_pm_ops,
+ .of_match_table = of_match_ptr(vt8500_ehci_ids),
}
};