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authorRichard Röjfors <richard.rojfors@pelagicore.com>2010-03-05 13:44:35 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-06 11:26:48 -0800
commit8c35c89aa3d7e0f253c3a10456a8b075288b4565 (patch)
tree571fa92195a23fbd6cab7de7cba099aa69da7269 /drivers/gpio
parent3e45f1d1155894e6f4291f5536b224874d52d8e2 (diff)
timbgpio: add support for interrupt triggering on both flanks
Introduce support for triggering interrupts on both rising and falling edge. This feature requires version 3 or newer of the IP, a version check is done when triggering on both edges is requested. Signed-off-by: Richard Röjfors <richard.rojfors@pelagicore.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/timbgpio.c32
1 files changed, 23 insertions, 9 deletions
diff --git a/drivers/gpio/timbgpio.c b/drivers/gpio/timbgpio.c
index 4ecba6e5a32d..d4295fa5369e 100644
--- a/drivers/gpio/timbgpio.c
+++ b/drivers/gpio/timbgpio.c
@@ -38,6 +38,8 @@
#define TGPIO_ICR 0x14
#define TGPIO_FLR 0x18
#define TGPIO_LVR 0x1c
+#define TGPIO_VER 0x20
+#define TGPIO_BFLR 0x24
struct timbgpio {
void __iomem *membase;
@@ -126,17 +128,23 @@ static int timbgpio_irq_type(unsigned irq, unsigned trigger)
struct timbgpio *tgpio = get_irq_chip_data(irq);
int offset = irq - tgpio->irq_base;
unsigned long flags;
- u32 lvr, flr;
+ u32 lvr, flr, bflr = 0;
+ u32 ver;
if (offset < 0 || offset > tgpio->gpio.ngpio)
return -EINVAL;
+ ver = ioread32(tgpio->membase + TGPIO_VER);
+
spin_lock_irqsave(&tgpio->lock, flags);
lvr = ioread32(tgpio->membase + TGPIO_LVR);
flr = ioread32(tgpio->membase + TGPIO_FLR);
+ if (ver > 2)
+ bflr = ioread32(tgpio->membase + TGPIO_BFLR);
if (trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
+ bflr &= ~(1 << offset);
flr &= ~(1 << offset);
if (trigger & IRQ_TYPE_LEVEL_HIGH)
lvr |= 1 << offset;
@@ -144,21 +152,27 @@ static int timbgpio_irq_type(unsigned irq, unsigned trigger)
lvr &= ~(1 << offset);
}
- if ((trigger & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH)
- return -EINVAL;
- else {
+ if ((trigger & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
+ if (ver < 3)
+ return -EINVAL;
+ else {
+ flr |= 1 << offset;
+ bflr |= 1 << offset;
+ }
+ } else {
+ bflr &= ~(1 << offset);
flr |= 1 << offset;
- /* opposite compared to the datasheet, but it mirrors the
- * reality
- */
if (trigger & IRQ_TYPE_EDGE_FALLING)
- lvr |= 1 << offset;
- else
lvr &= ~(1 << offset);
+ else
+ lvr |= 1 << offset;
}
iowrite32(lvr, tgpio->membase + TGPIO_LVR);
iowrite32(flr, tgpio->membase + TGPIO_FLR);
+ if (ver > 2)
+ iowrite32(bflr, tgpio->membase + TGPIO_BFLR);
+
iowrite32(1 << offset, tgpio->membase + TGPIO_ICR);
spin_unlock_irqrestore(&tgpio->lock, flags);