pinctrl: rockchip: emulate both edge triggered interrupts
From: Heiko Stuebner <heiko@...> Date: Thu, 29 Aug 2013 00:10:56 +0200
Commit-Message
The gpio interrupt controller on Rockchip socs can do edge triggers only for single edges but not both. Nevertheless a lot of gpio users rely on the availability of both-edge triggered interrupts - i.e. gpio-keys. Therefore implement a solution similar to pinctrl-coh901 re-setting the triggering edge depending on the gpio value in the interrupt demuxer. Signed-off-by: Heiko Stuebner <heiko@...>
Patch-Comment
drivers/pinctrl/pinctrl-rockchip.c | 61 +++++++++++++++++++++++++++++++----- 1 file changed, 54 insertions(+), 7 deletions(-)
Statistics
- 54 lines added
- 7 lines removed
Changes
---------------------- drivers/pinctrl/pinctrl-rockchip.c ----------------------
index f5e53a7..e939c28 100644
@@ -101,7 +101,7 @@ struct rockchip_pin_bank {
struct gpio_chip gpio_chip;
struct pinctrl_gpio_range grange;
spinlock_t slock;
+ u32 toggle_edge_mode;
};
#define PIN_BANK(id, pins, label) \
@@ -1078,7 +1078,9 @@ static void rockchip_irq_demux(unsigned int irq, struct irq_desc *desc)
{
struct irq_chip *chip = irq_get_chip(irq);
struct rockchip_pin_bank *bank = irq_get_handler_data(irq);
+ u32 polarity = 0, data = 0;
u32 pend;
+ bool edge_changed = false;
dev_dbg(bank->drvdata->dev, "got irq for bank %s\n", bank->name);
@@ -1086,6 +1088,12 @@ static void rockchip_irq_demux(unsigned int irq, struct irq_desc *desc)
pend = readl_relaxed(bank->reg_base + GPIO_INT_STATUS);
+ if (bank->toggle_edge_mode) {
+ polarity = readl_relaxed(bank->reg_base +
+ GPIO_INT_POLARITY);
+ data = readl_relaxed(bank->reg_base + GPIO_EXT_PORT);
+ }
+
while (pend) {
unsigned int virq;
@@ -1100,9 +1108,30 @@ static void rockchip_irq_demux(unsigned int irq, struct irq_desc *desc)
dev_dbg(bank->drvdata->dev, "handling irq %d\n", irq);
+ /*
+ * Triggering IRQ on both rising and falling edge
+ * needs manual intervention.
+ */
+ if (bank->toggle_edge_mode & BIT(irq)) {
+ if (data & BIT(irq))
+ polarity &= ~BIT(irq);
+ else
+ polarity |= BIT(irq);
+
+ edge_changed = true;
+ }
+
generic_handle_irq(virq);
}
+ if (bank->toggle_edge_mode && edge_changed) {
+ /* Interrupt params should only be set with ints disabled */
+ data = readl_relaxed(bank->reg_base + GPIO_INTEN);
+ writel_relaxed(0, bank->reg_base + GPIO_INTEN);
+ writel(polarity, bank->reg_base + GPIO_INT_POLARITY);
+ writel(data, bank->reg_base + GPIO_INTEN);
+ }
+
chained_irq_exit(chip, desc);
}
@@ -1115,6 +1144,12 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
u32 level;
u32 data;
+ /* make sure the pin is configured as gpio input */
+ rockchip_set_mux(bank, d->hwirq, RK_FUNC_GPIO);
+ data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
+ data &= ~mask;
+ writel_relaxed(data, bank->reg_base + GPIO_SWPORT_DDR);
+
if (type & IRQ_TYPE_EDGE_BOTH)
__irq_set_handler_locked(d->irq, handle_edge_irq);
else
@@ -1126,19 +1161,37 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
polarity = readl_relaxed(gc->reg_base + GPIO_INT_POLARITY);
switch (type) {
+ case IRQ_TYPE_EDGE_BOTH:
+ bank->toggle_edge_mode |= mask;
+ level |= mask;
+
+ /*
+ * Determine gpio state. If 1 next interrupt should be falling
+ * otherwise rising.
+ */
+ data = readl(bank->reg_base + GPIO_EXT_PORT);
+ if (data & mask)
+ polarity &= ~mask;
+ else
+ polarity |= mask;
+ break;
case IRQ_TYPE_EDGE_RISING:
+ bank->toggle_edge_mode &= ~mask;
level |= mask;
polarity |= mask;
break;
case IRQ_TYPE_EDGE_FALLING:
+ bank->toggle_edge_mode &= ~mask;
level |= mask;
polarity &= ~mask;
break;
case IRQ_TYPE_LEVEL_HIGH:
+ bank->toggle_edge_mode &= ~mask;
level &= ~mask;
polarity |= mask;
break;
case IRQ_TYPE_LEVEL_LOW:
+ bank->toggle_edge_mode &= ~mask;
level &= ~mask;
polarity &= ~mask;
break;
@@ -1152,12 +1205,6 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
irq_gc_unlock(gc);
return 0;
}