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authorRussell King <rmk+lkml@arm.linux.org.uk>2006-01-08 04:02:07 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 23:13:46 -0500
commit9ded96f24c3a5fcbef954e88c443385a1af37eb9 (patch)
tree49f43337e2b8d63a5a28402a15d99fe27d8d2a1c /arch/arm/mach-omap1/serial.c
parent705b6c7b34f2621f95f606d0e683daa10cdb8eb9 (diff)
[PATCH] IRQ type flags
Some ARM platforms have the ability to program the interrupt controller to detect various interrupt edges and/or levels. For some platforms, this is critical to setup correctly, particularly those which the setting is dependent on the device. Currently, ARM drivers do (eg) the following: err = request_irq(irq, ...); set_irq_type(irq, IRQT_RISING); However, if the interrupt has previously been programmed to be level sensitive (for whatever reason) then this will cause an interrupt storm. Hence, if we combine set_irq_type() with request_irq(), we can then safely set the type prior to unmasking the interrupt. The unfortunate problem is that in order to support this, these flags need to be visible outside of the ARM architecture - drivers such as smc91x need these flags and they're cross-architecture. Finally, the SA_TRIGGER_* flag passed to request_irq() should reflect the property that the device would like. The IRQ controller code should do its best to select the most appropriate supported mode. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/arm/mach-omap1/serial.c')
-rw-r--r--arch/arm/mach-omap1/serial.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/arm/mach-omap1/serial.c b/arch/arm/mach-omap1/serial.c
index fcfb81d13cfe..7a68f098a025 100644
--- a/arch/arm/mach-omap1/serial.c
+++ b/arch/arm/mach-omap1/serial.c
@@ -252,9 +252,8 @@ static void __init omap_serial_set_port_wakeup(int gpio_nr)
252 return; 252 return;
253 } 253 }
254 omap_set_gpio_direction(gpio_nr, 1); 254 omap_set_gpio_direction(gpio_nr, 1);
255 set_irq_type(OMAP_GPIO_IRQ(gpio_nr), IRQT_RISING);
256 ret = request_irq(OMAP_GPIO_IRQ(gpio_nr), &omap_serial_wake_interrupt, 255 ret = request_irq(OMAP_GPIO_IRQ(gpio_nr), &omap_serial_wake_interrupt,
257 0, "serial wakeup", NULL); 256 SA_TRIGGER_RISING, "serial wakeup", NULL);
258 if (ret) { 257 if (ret) {
259 omap_free_gpio(gpio_nr); 258 omap_free_gpio(gpio_nr);
260 printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n", 259 printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n",