[ARM] 4236/2: basic {enable,disable}_irq_wake() support for PXA

pxa_set_gpio_wake handles GPIOs > 1, so IRQ_TO_GPIO has to be used
instead of just substracting IRQ_GPIO0 from the irq number.

1 files changed, 70 insertions, 2 deletions

diff --git a/arch/arm/mach-pxa/irq.c b/arch/arm/mach-pxa/irq.c
index 9f7499b6d435..4619d5fe606c 100644
--- a/arch/arm/mach-pxa/irq.c
+++ b/arch/arm/mach-pxa/irq.c
@@ -38,11 +38,33 @@ static void pxa_unmask_low_irq(unsigned int irq)
         ICMR |= (1 << (irq + PXA_IRQ_SKIP));
 }
 
+static int pxa_set_wake(unsigned int irq, unsigned int on)
+{
+        u32     mask;
+
+        switch (irq) {
+        case IRQ_RTCAlrm:
+                mask = PWER_RTC;
+                break;
+#ifdef CONFIG_PXA27x
+        /* REVISIT can handle USBH1, USBH2, USB, MSL, USIM, ... */
+#endif
+        default:
+                return -EINVAL;
+        }
+        if (on)
+                PWER |= mask;
+        else
+                PWER &= ~mask;
+        return 0;
+}
+
 static struct irq_chip pxa_internal_chip_low = {
         .name           = "SC",
         .ack            = pxa_mask_low_irq,
         .mask           = pxa_mask_low_irq,
         .unmask         = pxa_unmask_low_irq,
+        .set_wake       = pxa_set_wake,
 };
 
 #if PXA_INTERNAL_IRQS > 32
@@ -70,6 +92,26 @@ static struct irq_chip pxa_internal_chip_high = {
 
 #endif
 
+/* Note that if an input/irq line ever gets changed to an output during
+ * suspend, the relevant PWER, PRER, and PFER bits should be cleared.
+ */
+#ifdef CONFIG_PXA27x
+
+/* PXA27x:  Various gpios can issue wakeup events.  This logic only
+ * handles the simple cases, not the WEMUX2 and WEMUX3 options
+ */
+#define PXA27x_GPIO_NOWAKE_MASK \
+        ((1 << 8) | (1 << 7) | (1 << 6) | (1 << 5) | (1 << 2))
+#define WAKEMASK(gpio) \
+        (((gpio) <= 15) \
+                ? ((1 << (gpio)) & ~PXA27x_GPIO_NOWAKE_MASK) \
+                : ((gpio == 35) ? (1 << 24) : 0))
+#else
+
+/* pxa 210, 250, 255, 26x:  gpios 0..15 can issue wakeups */
+#define WAKEMASK(gpio) (((gpio) <= 15) ? (1 << (gpio)) : 0)
+#endif
+
 /*
  * PXA GPIO edge detection for IRQs:
  * IRQs are generated on Falling-Edge, Rising-Edge, or both.
@@ -83,9 +125,11 @@ static long GPIO_IRQ_mask[4];
 static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
 {
         int gpio, idx;
+        u32 mask;
 
         gpio = IRQ_TO_GPIO(irq);
         idx = gpio >> 5;
+        mask = WAKEMASK(gpio);
 
         if (type == IRQT_PROBE) {
             /* Don't mess with enabled GPIOs using preconfigured edges or
@@ -105,14 +149,20 @@ static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
         if (type & __IRQT_RISEDGE) {
                 /* printk("rising "); */
                 __set_bit (gpio, GPIO_IRQ_rising_edge);
-        } else
+                PRER |= mask;
+        } else {
                 __clear_bit (gpio, GPIO_IRQ_rising_edge);
+                PRER &= ~mask;
+        }
 
         if (type & __IRQT_FALEDGE) {
                 /* printk("falling "); */
                 __set_bit (gpio, GPIO_IRQ_falling_edge);
-        } else
+                PFER |= mask;
+        } else {
                 __clear_bit (gpio, GPIO_IRQ_falling_edge);
+                PFER &= ~mask;
+        }
 
         /* printk("edges\n"); */
 
@@ -130,12 +180,29 @@ static void pxa_ack_low_gpio(unsigned int irq)
         GEDR0 = (1 << (irq - IRQ_GPIO0));
 }
 
+static int pxa_set_gpio_wake(unsigned int irq, unsigned int on)
+{
+        int     gpio = IRQ_TO_GPIO(irq);
+        u32     mask = WAKEMASK(gpio);
+
+        if (!mask)
+                return -EINVAL;
+
+        if (on)
+                PWER |= mask;
+        else
+                PWER &= ~mask;
+        return 0;
+}
+
+
 static struct irq_chip pxa_low_gpio_chip = {
         .name           = "GPIO-l",
         .ack            = pxa_ack_low_gpio,
         .mask           = pxa_mask_low_irq,
         .unmask         = pxa_unmask_low_irq,
         .set_type       = pxa_gpio_irq_type,
+        .set_wake       = pxa_set_gpio_wake,
 };
 
 /*
@@ -244,6 +311,7 @@ static struct irq_chip pxa_muxed_gpio_chip = {
         .mask           = pxa_mask_muxed_gpio,
         .unmask         = pxa_unmask_muxed_gpio,
         .set_type       = pxa_gpio_irq_type,
+        .set_wake       = pxa_set_gpio_wake,
 };