ARM i.MX avic: convert to use generic irq chip
Convert i.MX avic irq handler to use generic irq chip. This not only
provides a cleanup implementation of irq chip handler, but also
implements suspend/resume interface with the help of generic irq chip
interface.
Change mxc_irq_chip to a new structure mxc_extra_irq to handle fiq
and priority functions.
Signed-off-by: Hui Wang <jason77.wang@gmail.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/plat-mxc/avic.c b/arch/arm/plat-mxc/avic.c
index 55d2534..846636a 100644
--- a/arch/arm/plat-mxc/avic.c
+++ b/arch/arm/plat-mxc/avic.c
@@ -50,6 +50,8 @@
void __iomem *avic_base;
+static u32 avic_saved_mask_reg[2];
+
#ifdef CONFIG_MXC_IRQ_PRIOR
static int avic_irq_set_priority(unsigned char irq, unsigned char prio)
{
@@ -90,24 +92,8 @@
}
#endif /* CONFIG_FIQ */
-/* Disable interrupt number "irq" in the AVIC */
-static void mxc_mask_irq(struct irq_data *d)
-{
- __raw_writel(d->irq, avic_base + AVIC_INTDISNUM);
-}
-/* Enable interrupt number "irq" in the AVIC */
-static void mxc_unmask_irq(struct irq_data *d)
-{
- __raw_writel(d->irq, avic_base + AVIC_INTENNUM);
-}
-
-static struct mxc_irq_chip mxc_avic_chip = {
- .base = {
- .irq_ack = mxc_mask_irq,
- .irq_mask = mxc_mask_irq,
- .irq_unmask = mxc_unmask_irq,
- },
+static struct mxc_extra_irq avic_extra_irq = {
#ifdef CONFIG_MXC_IRQ_PRIOR
.set_priority = avic_irq_set_priority,
#endif
@@ -116,6 +102,56 @@
#endif
};
+
+#ifdef CONFIG_PM
+static void avic_irq_suspend(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct irq_chip_type *ct = gc->chip_types;
+ int idx = gc->irq_base >> 5;
+
+ avic_saved_mask_reg[idx] = __raw_readl(avic_base + ct->regs.mask);
+ __raw_writel(gc->wake_active, avic_base + ct->regs.mask);
+}
+
+static void avic_irq_resume(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct irq_chip_type *ct = gc->chip_types;
+ int idx = gc->irq_base >> 5;
+
+ __raw_writel(avic_saved_mask_reg[idx], avic_base + ct->regs.mask);
+}
+
+#else
+#define avic_irq_suspend NULL
+#define avic_irq_resume NULL
+#endif
+
+static __init void avic_init_gc(unsigned int irq_start)
+{
+ struct irq_chip_generic *gc;
+ struct irq_chip_type *ct;
+ int idx = irq_start >> 5;
+
+ gc = irq_alloc_generic_chip("mxc-avic", 1, irq_start, avic_base,
+ handle_level_irq);
+ gc->private = &avic_extra_irq;
+ gc->wake_enabled = IRQ_MSK(32);
+
+ ct = gc->chip_types;
+ ct->chip.irq_mask = irq_gc_mask_clr_bit;
+ ct->chip.irq_unmask = irq_gc_mask_set_bit;
+ ct->chip.irq_ack = irq_gc_mask_clr_bit;
+ ct->chip.irq_set_wake = irq_gc_set_wake;
+ ct->chip.irq_suspend = avic_irq_suspend;
+ ct->chip.irq_resume = avic_irq_resume;
+ ct->regs.mask = !idx ? AVIC_INTENABLEL : AVIC_INTENABLEH;
+ ct->regs.ack = ct->regs.mask;
+
+ irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
+}
+
/*
* This function initializes the AVIC hardware and disables all the
* interrupts. It registers the interrupt enable and disable functions
@@ -140,11 +176,9 @@
/* all IRQ no FIQ */
__raw_writel(0, avic_base + AVIC_INTTYPEH);
__raw_writel(0, avic_base + AVIC_INTTYPEL);
- for (i = 0; i < AVIC_NUM_IRQS; i++) {
- irq_set_chip_and_handler(i, &mxc_avic_chip.base,
- handle_level_irq);
- set_irq_flags(i, IRQF_VALID);
- }
+
+ for (i = 0; i < AVIC_NUM_IRQS; i += 32)
+ avic_init_gc(i);
/* Set default priority value (0) for all IRQ's */
for (i = 0; i < 8; i++)
@@ -157,4 +191,3 @@
printk(KERN_INFO "MXC IRQ initialized\n");
}
-