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path: root/arch/arm/plat-mxc/gpio.c
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Diffstat (limited to 'arch/arm/plat-mxc/gpio.c')
-rw-r--r--arch/arm/plat-mxc/gpio.c49
1 files changed, 48 insertions, 1 deletions
diff --git a/arch/arm/plat-mxc/gpio.c b/arch/arm/plat-mxc/gpio.c
index 89e95798cc3..7506d963be4 100644
--- a/arch/arm/plat-mxc/gpio.c
+++ b/arch/arm/plat-mxc/gpio.c
@@ -64,6 +64,8 @@ static void gpio_unmask_irq(u32 irq)
_set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 1);
}
+static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset);
+
static int gpio_set_irq_type(u32 irq, u32 type)
{
u32 gpio = irq_to_gpio(irq);
@@ -72,6 +74,7 @@ static int gpio_set_irq_type(u32 irq, u32 type)
int edge;
void __iomem *reg = port->base;
+ port->both_edges &= ~(1 << (gpio & 31));
switch (type) {
case IRQ_TYPE_EDGE_RISING:
edge = GPIO_INT_RISE_EDGE;
@@ -79,13 +82,24 @@ static int gpio_set_irq_type(u32 irq, u32 type)
case IRQ_TYPE_EDGE_FALLING:
edge = GPIO_INT_FALL_EDGE;
break;
+ case IRQ_TYPE_EDGE_BOTH:
+ val = mxc_gpio_get(&port->chip, gpio & 31);
+ if (val) {
+ edge = GPIO_INT_LOW_LEV;
+ pr_debug("mxc: set GPIO %d to low trigger\n", gpio);
+ } else {
+ edge = GPIO_INT_HIGH_LEV;
+ pr_debug("mxc: set GPIO %d to high trigger\n", gpio);
+ }
+ port->both_edges |= 1 << (gpio & 31);
+ break;
case IRQ_TYPE_LEVEL_LOW:
edge = GPIO_INT_LOW_LEV;
break;
case IRQ_TYPE_LEVEL_HIGH:
edge = GPIO_INT_HIGH_LEV;
break;
- default: /* this includes IRQ_TYPE_EDGE_BOTH */
+ default:
return -EINVAL;
}
@@ -98,6 +112,34 @@ static int gpio_set_irq_type(u32 irq, u32 type)
return 0;
}
+static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio)
+{
+ void __iomem *reg = port->base;
+ u32 bit, val;
+ int edge;
+
+ reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */
+ bit = gpio & 0xf;
+ val = __raw_readl(reg);
+ edge = (val >> (bit << 1)) & 3;
+ val &= ~(0x3 << (bit << 1));
+ switch (edge) {
+ case GPIO_INT_HIGH_LEV:
+ edge = GPIO_INT_LOW_LEV;
+ pr_debug("mxc: switch GPIO %d to low trigger\n", gpio);
+ break;
+ case GPIO_INT_LOW_LEV:
+ edge = GPIO_INT_HIGH_LEV;
+ pr_debug("mxc: switch GPIO %d to high trigger\n", gpio);
+ break;
+ default:
+ pr_err("mxc: invalid configuration for GPIO %d: %x\n",
+ gpio, edge);
+ return;
+ }
+ __raw_writel(val | (edge << (bit << 1)), reg);
+}
+
/* handle n interrupts in one status register */
static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat)
{
@@ -105,11 +147,16 @@ static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat)
gpio_irq_no = port->virtual_irq_start;
for (; irq_stat != 0; irq_stat >>= 1, gpio_irq_no++) {
+ u32 gpio = irq_to_gpio(gpio_irq_no);
if ((irq_stat & 1) == 0)
continue;
BUG_ON(!(irq_desc[gpio_irq_no].handle_irq));
+
+ if (port->both_edges & (1 << (gpio & 31)))
+ mxc_flip_edge(port, gpio);
+
irq_desc[gpio_irq_no].handle_irq(gpio_irq_no,
&irq_desc[gpio_irq_no]);
}