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>

3 files changed, 52 insertions, 17 deletions

diff --git a/drivers/usb/host/isp116x-hcd.c b/drivers/usb/host/isp116x-hcd.c
index ce1ca0b..4dda31b 100644
--- a/drivers/usb/host/isp116x-hcd.c
+++ b/drivers/usb/host/isp116x-hcd.c
@@ -1562,11 +1562,12 @@ static int __devinit isp116x_probe(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd;
 	struct isp116x *isp116x;
-	struct resource *addr, *data;
+	struct resource *addr, *data, *ires;
 	void __iomem *addr_reg;
 	void __iomem *data_reg;
 	int irq;
 	int ret = 0;
+	unsigned long irqflags;
 
 	if (pdev->num_resources < 3) {
 		ret = -ENODEV;
@@ -1575,12 +1576,16 @@ static int __devinit isp116x_probe(struct platform_device *pdev)
 
 	data = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	addr = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	irq = platform_get_irq(pdev, 0);
-	if (!addr || !data || irq < 0) {
+	ires = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+
+	if (!addr || !data || !ires) {
 		ret = -ENODEV;
 		goto err1;
 	}
 
+	irq = ires->start;
+	irqflags = ires->flags & IRQF_TRIGGER_MASK;
+
 	if (pdev->dev.dma_mask) {
 		DBG("DMA not supported\n");
 		ret = -EINVAL;
@@ -1634,7 +1639,7 @@ static int __devinit isp116x_probe(struct platform_device *pdev)
 		goto err6;
 	}
 
-	ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
+	ret = usb_add_hcd(hcd, irq, irqflags | IRQF_DISABLED);
 	if (ret)
 		goto err6;
 
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 @@ static unsigned short endian;
 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 @@ static int __init_or_module r8a66597_remove(struct platform_device *pdev)
 #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 @@ static int __init r8a66597_probe(struct platform_device *pdev)
 		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 @@ static int __init r8a66597_probe(struct platform_device *pdev)
 	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");
diff --git a/drivers/usb/host/sl811-hcd.c b/drivers/usb/host/sl811-hcd.c
index 8a74bbb..e106e9d 100644
--- a/drivers/usb/host/sl811-hcd.c
+++ b/drivers/usb/host/sl811-hcd.c
@@ -1620,22 +1620,26 @@ sl811h_probe(struct platform_device *dev)
 {
 	struct usb_hcd		*hcd;
 	struct sl811		*sl811;
-	struct resource		*addr, *data;
+	struct resource		*addr, *data, *ires;
 	int			irq;
 	void __iomem		*addr_reg;
 	void __iomem		*data_reg;
 	int			retval;
 	u8			tmp, ioaddr = 0;
+	unsigned long		irqflags;
 
 	/* basic sanity checks first.  board-specific init logic should
 	 * have initialized these three resources and probably board
 	 * specific platform_data.  we don't probe for IRQs, and do only
 	 * minimal sanity checking.
 	 */
-	irq = platform_get_irq(dev, 0);
-	if (dev->num_resources < 3 || irq < 0)
+	ires = platform_get_resource(dev, IORESOURCE_IRQ, 0);
+	if (dev->num_resources < 3 || !ires)
 		return -ENODEV;
 
+	irq = ires->start;
+	irqflags = ires->flags & IRQF_TRIGGER_MASK;
+
 	/* refuse to confuse usbcore */
 	if (dev->dev.dma_mask) {
 		DBG("no we won't dma\n");
@@ -1717,8 +1721,11 @@ sl811h_probe(struct platform_device *dev)
 	 * triggers (e.g. most ARM CPUs).  Initial driver stress testing
 	 * was on a system with single edge triggering, so most sorts of
 	 * triggering arrangement should work.
+	 *
+	 * Use resource IRQ flags if set by platform device setup.
 	 */
-	retval = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
+	irqflags |= IRQF_SHARED;
+	retval = usb_add_hcd(hcd, irq, IRQF_DISABLED | irqflags);
 	if (retval != 0)
 		goto err6;