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authorNicolas Pitre <nico@cam.org>2009-02-17 20:45:50 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-02-17 22:37:09 +0000
commitfd4b9b3650076ffadbdd6e360eb198f5d61747c0 (patch)
treeef6246442bf2c434269355f7ec52eefd897c1cb0 /arch/arm/plat-orion
parent744f6592727a7ab9e3ca4266bedaa786825a31bb (diff)
downloadlinux-fd4b9b3650076ffadbdd6e360eb198f5d61747c0.tar.bz2
[ARM] 5401/1: Orion: fix edge triggered GPIO interrupt support
The GPIO interrupts can be configured as either level triggered or edge triggered, with a default of level triggered. When an edge triggered interrupt is requested, the gpio_irq_set_type method is called which currently switches the given IRQ descriptor between two struct irq_chip instances: orion_gpio_irq_level_chip and orion_gpio_irq_edge_chip. This happens via __setup_irq() which also calls irq_chip_set_defaults() to assign default methods to uninitialized ones. The problem is that irq_chip_set_defaults() is called before the irq_chip reference is switched, leaving the new irq_chip (orion_gpio_irq_edge_chip in this case) with uninitialized methods such as chip->startup() causing a kernel oops. Many solutions are possible, such as making irq_chip_set_defaults() global and calling it from gpio_irq_set_type(), or calling __irq_set_trigger() before irq_chip_set_defaults() in __setup_irq(). But those require modifications to the generic IRQ code which might have adverse effect on other architectures, and that would still be a fragile arrangement. Manually copying the missing methods from within gpio_irq_set_type() would be really ugly and it would break again the day new methods with automatic defaults are added. A better solution is to have a single irq_chip instance which can deal with both edge and level triggered interrupts. It is also a good idea to switch the IRQ handler instead, as the edge IRQ handler allows for one edge IRQ event to be queued as the IRQ is actually masked only when that second IRQ is received, at which point the hardware can queue an additional IRQ event, making edge triggered interrupts a bit more reliable. Tested-by: Martin Michlmayr <tbm@cyrius.com> Signed-off-by: Nicolas Pitre <nico@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/plat-orion')
-rw-r--r--arch/arm/plat-orion/gpio.c73
-rw-r--r--arch/arm/plat-orion/include/plat/gpio.h3
2 files changed, 26 insertions, 50 deletions
diff --git a/arch/arm/plat-orion/gpio.c b/arch/arm/plat-orion/gpio.c
index 967186425ca1..0d12c2164766 100644
--- a/arch/arm/plat-orion/gpio.c
+++ b/arch/arm/plat-orion/gpio.c
@@ -265,51 +265,36 @@ EXPORT_SYMBOL(orion_gpio_set_blink);
* polarity LEVEL mask
*
****************************************************************************/
-static void gpio_irq_edge_ack(u32 irq)
-{
- int pin = irq_to_gpio(irq);
-
- writel(~(1 << (pin & 31)), GPIO_EDGE_CAUSE(pin));
-}
-
-static void gpio_irq_edge_mask(u32 irq)
-{
- int pin = irq_to_gpio(irq);
- u32 u;
-
- u = readl(GPIO_EDGE_MASK(pin));
- u &= ~(1 << (pin & 31));
- writel(u, GPIO_EDGE_MASK(pin));
-}
-static void gpio_irq_edge_unmask(u32 irq)
+static void gpio_irq_ack(u32 irq)
{
- int pin = irq_to_gpio(irq);
- u32 u;
-
- u = readl(GPIO_EDGE_MASK(pin));
- u |= 1 << (pin & 31);
- writel(u, GPIO_EDGE_MASK(pin));
+ int type = irq_desc[irq].status & IRQ_TYPE_SENSE_MASK;
+ if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
+ int pin = irq_to_gpio(irq);
+ writel(~(1 << (pin & 31)), GPIO_EDGE_CAUSE(pin));
+ }
}
-static void gpio_irq_level_mask(u32 irq)
+static void gpio_irq_mask(u32 irq)
{
int pin = irq_to_gpio(irq);
- u32 u;
-
- u = readl(GPIO_LEVEL_MASK(pin));
+ int type = irq_desc[irq].status & IRQ_TYPE_SENSE_MASK;
+ u32 reg = (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) ?
+ GPIO_EDGE_MASK(pin) : GPIO_LEVEL_MASK(pin);
+ u32 u = readl(reg);
u &= ~(1 << (pin & 31));
- writel(u, GPIO_LEVEL_MASK(pin));
+ writel(u, reg);
}
-static void gpio_irq_level_unmask(u32 irq)
+static void gpio_irq_unmask(u32 irq)
{
int pin = irq_to_gpio(irq);
- u32 u;
-
- u = readl(GPIO_LEVEL_MASK(pin));
+ int type = irq_desc[irq].status & IRQ_TYPE_SENSE_MASK;
+ u32 reg = (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) ?
+ GPIO_EDGE_MASK(pin) : GPIO_LEVEL_MASK(pin);
+ u32 u = readl(reg);
u |= 1 << (pin & 31);
- writel(u, GPIO_LEVEL_MASK(pin));
+ writel(u, reg);
}
static int gpio_irq_set_type(u32 irq, u32 type)
@@ -331,9 +316,9 @@ static int gpio_irq_set_type(u32 irq, u32 type)
* Set edge/level type.
*/
if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
- desc->chip = &orion_gpio_irq_edge_chip;
+ desc->handle_irq = handle_edge_irq;
} else if (type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
- desc->chip = &orion_gpio_irq_level_chip;
+ desc->handle_irq = handle_level_irq;
} else {
printk(KERN_ERR "failed to set irq=%d (type=%d)\n", irq, type);
return -EINVAL;
@@ -371,19 +356,11 @@ static int gpio_irq_set_type(u32 irq, u32 type)
return 0;
}
-struct irq_chip orion_gpio_irq_edge_chip = {
- .name = "orion_gpio_irq_edge",
- .ack = gpio_irq_edge_ack,
- .mask = gpio_irq_edge_mask,
- .unmask = gpio_irq_edge_unmask,
- .set_type = gpio_irq_set_type,
-};
-
-struct irq_chip orion_gpio_irq_level_chip = {
- .name = "orion_gpio_irq_level",
- .mask = gpio_irq_level_mask,
- .mask_ack = gpio_irq_level_mask,
- .unmask = gpio_irq_level_unmask,
+struct irq_chip orion_gpio_irq_chip = {
+ .name = "orion_gpio",
+ .ack = gpio_irq_ack,
+ .mask = gpio_irq_mask,
+ .unmask = gpio_irq_unmask,
.set_type = gpio_irq_set_type,
};
diff --git a/arch/arm/plat-orion/include/plat/gpio.h b/arch/arm/plat-orion/include/plat/gpio.h
index 54deaf274b52..ec743e82c876 100644
--- a/arch/arm/plat-orion/include/plat/gpio.h
+++ b/arch/arm/plat-orion/include/plat/gpio.h
@@ -31,8 +31,7 @@ void orion_gpio_set_blink(unsigned pin, int blink);
/*
* GPIO interrupt handling.
*/
-extern struct irq_chip orion_gpio_irq_edge_chip;
-extern struct irq_chip orion_gpio_irq_level_chip;
+extern struct irq_chip orion_gpio_irq_chip;
void orion_gpio_irq_handler(int irqoff);