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---
arch/avr32/mach-at32ap/pio.c | 73 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 72 insertions(+), 1 deletion(-)
Index: linux-2.6.18-avr32/arch/avr32/mach-at32ap/pio.c
===================================================================
--- linux-2.6.18-avr32.orig/arch/avr32/mach-at32ap/pio.c 2006-11-29 18:17:15.000000000 +0100
+++ linux-2.6.18-avr32/arch/avr32/mach-at32ap/pio.c 2006-11-30 11:50:27.000000000 +0100
@@ -11,6 +11,7 @@
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/fs.h>
+#include <linux/irq.h>
#include <linux/platform_device.h>
#include <asm/gpio.h>
@@ -709,20 +710,90 @@ err_class_create:
late_initcall(pio_init_dev);
#endif /* CONFIG_PIO_DEV */
+/* Interrupt controller implementation */
+static void pio_mask_irq(unsigned int irq)
+{
+ struct pio_device *pio = get_irq_chip_data(irq);
+
+ pio_writel(pio, IDR, 1 << (irq & 0x1f));
+}
+
+static void pio_unmask_irq(unsigned int irq)
+{
+ struct pio_device *pio = get_irq_chip_data(irq);
+
+ pio_writel(pio, IER, 1 << (irq & 0x1f));
+}
+
+static int pio_set_irq_type(unsigned int irq, unsigned int flow_type)
+{
+ if (flow_type != IRQ_TYPE_NONE && flow_type != IRQ_TYPE_EDGE_BOTH)
+ return -EINVAL;
+
+ return 0;
+}
+
+static struct irq_chip pio_irq_chip = {
+ .name = "pio",
+ .mask = pio_mask_irq,
+ .unmask = pio_unmask_irq,
+ .set_type = pio_set_irq_type,
+};
+
+static void demux_pio_irq(unsigned int irq, struct irq_desc *desc,
+ struct pt_regs *regs)
+{
+ struct pio_device *pio = desc->handler_data;
+ struct irq_desc *ext_desc;
+ u32 status, pending;
+ unsigned int ext_irq;
+ unsigned int i;
+
+ status = pio_readl(pio, ISR);
+ pending = status & pio_readl(pio, IMR);
+
+ while (pending) {
+ i = fls(pending) - 1;
+ pending &= ~(1 << i);
+
+ ext_irq = gpio_to_irq(32 * pio_id(pio) + i);
+ ext_desc = irq_desc + ext_irq;
+ ext_desc->handle_irq(ext_irq, ext_desc, regs);
+ }
+}
+
static int __init pio_probe(struct platform_device *pdev)
{
struct pio_device *pio = NULL;
+ unsigned int i;
+ int int_irq, ext_irq;
BUG_ON(pdev->id >= MAX_NR_PIO_DEVICES);
pio = &pio_dev[pdev->id];
BUG_ON(!pio->regs);
- /* TODO: Interrupts */
+ /* Set up interrupts */
+ pio_writel(pio, IDR, ~0UL);
+ pio_readl(pio, ISR);
+
+ ext_irq = gpio_to_irq(32 * pdev->id);
+ for (i = 0; i < 32; i++, ext_irq++) {
+ set_irq_chip_and_handler(ext_irq, &pio_irq_chip,
+ handle_simple_irq);
+ set_irq_chip_data(ext_irq, pio);
+ }
+
+ int_irq = platform_get_irq(pdev, 0);
+ set_irq_chained_handler(int_irq, demux_pio_irq);
+ set_irq_data(int_irq, pio);
platform_set_drvdata(pdev, pio);
printk(KERN_INFO "%s: Atmel Port Multiplexer at 0x%p (irq %d)\n",
pio->name, pio->regs, platform_get_irq(pdev, 0));
+ printk(KERN_INFO
+ "%s: Handling 32 external IRQs, starting with IRQ %d\n",
+ pio->name, ext_irq - 32);
return 0;
}
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