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Subject[PATCH v2 2/2] gpio-langwell: implement irq shutdown interface
Date
From: "Li, Ning" <ning.li@intel.com>

Disable falling/rising edge detection during irq shutdown operation.

Signed-off-by: David Cohen <david.a.cohen@intel.com>
Signed-off-by: Li, Ning <ning.li@intel.com>
---
drivers/gpio/gpio-langwell.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/drivers/gpio/gpio-langwell.c b/drivers/gpio/gpio-langwell.c
index 2be69fe..10cc520 100644
--- a/drivers/gpio/gpio-langwell.c
+++ b/drivers/gpio/gpio-langwell.c
@@ -225,11 +225,32 @@ static void lnw_irq_mask(struct irq_data *d)
{
}

+static void lnw_irq_shutdown(struct irq_data *d)
+{
+ struct lnw_gpio *lnw = irq_data_get_irq_chip_data(d);
+ u32 gpio = irqd_to_hwirq(d);
+ unsigned long flags;
+ u32 value;
+ void __iomem *grer = gpio_reg(&lnw->chip, gpio, GRER);
+ void __iomem *gfer = gpio_reg(&lnw->chip, gpio, GFER);
+
+ spin_lock_irqsave(&lnw->lock, flags);
+
+ /* Disable falling/rising edge detection */
+ value = readl(grer) & ~BIT(gpio % 32);
+ writel(value, grer);
+ value = readl(gfer) & ~BIT(gpio % 32);
+ writel(value, gfer);
+
+ spin_unlock_irqrestore(&lnw->lock, flags);
+};
+
static struct irq_chip lnw_irqchip = {
.name = "LNW-GPIO",
.irq_mask = lnw_irq_mask,
.irq_unmask = lnw_irq_unmask,
.irq_set_type = lnw_irq_type,
+ .irq_shutdown = lnw_irq_shutdown,
};

static DEFINE_PCI_DEVICE_TABLE(lnw_gpio_ids) = { /* pin number */
--
1.7.10.4


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