USB: Let some USB host controllers get IRQ flags from resource
[This version fixes a thinko in the r8a66597 driver]
This patch let a few discrete USB host controllers drivers (isp116x-hcd,
r8a66597-hcd and sl811-hcd) obtain IRQ flags from their IORESOURCE_IRQ
resource if configured as such, much like it's been done for the smc91x
driver.
It spares people writing support for specific boards the burden to
configure the interrupt controller independantly, and keeps all IRQ
related information in a single resource.
HCD that are integrally part of a SoC have been left aside, as there
is probably no "wiring" options...
Tested on an Xscale PXA-255 based platform with isp116x-hcd.
Signed-off-by: Marc Zyngier <marc.zyngier@altran.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index ea7126f..3a45ad2 100644
--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -66,7 +66,7 @@
module_param(endian, ushort, 0644);
MODULE_PARM_DESC(endian, "data endian: big=256, little=0 (default=0)");
-static unsigned short irq_sense = INTL;
+static unsigned short irq_sense = 0xff;
module_param(irq_sense, ushort, 0644);
MODULE_PARM_DESC(irq_sense, "IRQ sense: low level=32, falling edge=0 "
"(default=32)");
@@ -2263,7 +2263,7 @@
#define resource_len(r) (((r)->end - (r)->start) + 1)
static int __init r8a66597_probe(struct platform_device *pdev)
{
- struct resource *res = NULL;
+ struct resource *res = NULL, *ires;
int irq = -1;
void __iomem *reg = NULL;
struct usb_hcd *hcd = NULL;
@@ -2286,13 +2286,16 @@
goto clean_up;
}
- irq = platform_get_irq(pdev, 0);
- if (irq < 0) {
+ ires = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!ires) {
ret = -ENODEV;
- err("platform_get_irq error.");
+ err("platform_get_resource IORESOURCE_IRQ error.");
goto clean_up;
}
+ irq = ires->start;
+ irq_trigger = ires->flags & IRQF_TRIGGER_MASK;
+
reg = ioremap(res->start, resource_len(res));
if (reg == NULL) {
ret = -ENOMEM;
@@ -2329,10 +2332,30 @@
INIT_LIST_HEAD(&r8a66597->child_device);
hcd->rsrc_start = res->start;
- if (irq_sense == INTL)
- irq_trigger = IRQF_TRIGGER_LOW;
- else
- irq_trigger = IRQF_TRIGGER_FALLING;
+
+ /* irq_sense setting on cmdline takes precedence over resource
+ * settings, so the introduction of irqflags in IRQ resourse
+ * won't disturb existing setups */
+ switch (irq_sense) {
+ case INTL:
+ irq_trigger = IRQF_TRIGGER_LOW;
+ break;
+ case 0:
+ irq_trigger = IRQF_TRIGGER_FALLING;
+ break;
+ case 0xff:
+ if (irq_trigger)
+ irq_sense = (irq_trigger & IRQF_TRIGGER_LOW) ?
+ INTL : 0;
+ else {
+ irq_sense = INTL;
+ irq_trigger = IRQF_TRIGGER_LOW;
+ }
+ break;
+ default:
+ err("Unknown irq_sense value.");
+ }
+
ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | irq_trigger);
if (ret != 0) {
err("Failed to add hcd");