73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
|
/*
|
||
|
|
* Support for Versatile FPGA-based IRQ controllers
|
||
|
|
*/
|
||
|
|
#include <linux/irq.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
|
||
|
|
#include <asm/mach/irq.h>
|
||
|
|
#include <plat/fpga-irq.h>
|
||
|
|
|
||
|
|
#define IRQ_STATUS 0x00
|
||
|
|
#define IRQ_RAW_STATUS 0x04
|
||
|
|
#define IRQ_ENABLE_SET 0x08
|
||
|
|
#define IRQ_ENABLE_CLEAR 0x0c
|
||
|
|
|
||
|
|
static void fpga_irq_mask(struct irq_data *d)
|
||
|
|
{
|
||
|
|
struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
|
||
|
|
u32 mask = 1 << (d->irq - f->irq_start);
|
||
|
|
|
||
|
|
writel(mask, f->base + IRQ_ENABLE_CLEAR);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void fpga_irq_unmask(struct irq_data *d)
|
||
|
|
{
|
||
|
|
struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
|
||
|
|
u32 mask = 1 << (d->irq - f->irq_start);
|
||
|
|
|
||
|
|
writel(mask, f->base + IRQ_ENABLE_SET);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void fpga_irq_handle(unsigned int irq, struct irq_desc *desc)
|
||
|
|
{
|
||
|
|
struct fpga_irq_data *f = irq_desc_get_handler_data(desc);
|
||
|
|
u32 status = readl(f->base + IRQ_STATUS);
|
||
|
|
|
||
|
|
if (status == 0) {
|
||
|
|
do_bad_IRQ(irq, desc);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
do {
|
||
|
|
irq = ffs(status) - 1;
|
||
|
|
status &= ~(1 << irq);
|
||
|
|
|
||
|
|
generic_handle_irq(irq + f->irq_start);
|
||
|
|
} while (status);
|
||
|
|
}
|
||
|
|
|
||
|
|
void __init fpga_irq_init(int parent_irq, u32 valid, struct fpga_irq_data *f)
|
||
|
|
{
|
||
|
|
unsigned int i;
|
||
|
|
|
||
|
|
f->chip.irq_ack = fpga_irq_mask;
|
||
|
|
f->chip.irq_mask = fpga_irq_mask;
|
||
|
|
f->chip.irq_unmask = fpga_irq_unmask;
|
||
|
|
|
||
|
|
if (parent_irq != -1) {
|
||
|
|
irq_set_handler_data(parent_irq, f);
|
||
|
|
irq_set_chained_handler(parent_irq, fpga_irq_handle);
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < 32; i++) {
|
||
|
|
if (valid & (1 << i)) {
|
||
|
|
unsigned int irq = f->irq_start + i;
|
||
|
|
|
||
|
|
irq_set_chip_data(irq, f);
|
||
|
|
irq_set_chip_and_handler(irq, &f->chip,
|
||
|
|
handle_level_irq);
|
||
|
|
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|