mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-10 14:55:00 +02:00
94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
|
/*
|
||
|
|
* Moschip MCS814x generic interrupt controller routines
|
||
|
|
*
|
||
|
|
* Copyright (C) 2012, Florian Fainelli <florian@openwrt.org>
|
||
|
|
*
|
||
|
|
* Licensed under the GPLv2
|
||
|
|
*/
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/irq.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/of.h>
|
||
|
|
#include <linux/of_address.h>
|
||
|
|
#include <linux/irqdomain.h>
|
||
|
|
|
||
|
|
#include <asm/exception.h>
|
||
|
|
#include <asm/mach/irq.h>
|
||
|
|
|
||
|
|
#define MCS814X_IRQ_ICR 0x00
|
||
|
|
#define MCS814X_IRQ_ISR 0x04
|
||
|
|
#define MCS814X_IRQ_MASK 0x20
|
||
|
|
#define MCS814X_IRQ_STS0 0x40
|
||
|
|
|
||
|
|
static void __iomem *mcs814x_intc_base;
|
||
|
|
|
||
|
|
static void __init mcs814x_alloc_gc(void __iomem *base, unsigned int irq_start,
|
||
|
|
unsigned int num)
|
||
|
|
{
|
||
|
|
struct irq_chip_generic *gc;
|
||
|
|
struct irq_chip_type *ct;
|
||
|
|
|
||
|
|
gc = irq_alloc_generic_chip("mcs814x-intc", 1,
|
||
|
|
irq_start, base, handle_level_irq);
|
||
|
|
if (!gc)
|
||
|
|
panic("unable to allocate generic irq chip");
|
||
|
|
|
||
|
|
ct = gc->chip_types;
|
||
|
|
ct->chip.irq_ack = irq_gc_unmask_enable_reg;
|
||
|
|
ct->chip.irq_mask = irq_gc_mask_clr_bit;
|
||
|
|
ct->chip.irq_unmask = irq_gc_mask_set_bit;
|
||
|
|
ct->regs.mask = MCS814X_IRQ_MASK;
|
||
|
|
ct->regs.enable = MCS814X_IRQ_ICR;
|
||
|
|
|
||
|
|
irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
|
||
|
|
IRQ_NOREQUEST, 0);
|
||
|
|
|
||
|
|
/* Clear all interrupts */
|
||
|
|
__raw_writel(0xffffffff, base + MCS814X_IRQ_ICR);
|
||
|
|
}
|
||
|
|
|
||
|
|
asmlinkage void __exception_irq_entry mcs814x_handle_irq(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
u32 status, irq;
|
||
|
|
|
||
|
|
do {
|
||
|
|
/* read the status register */
|
||
|
|
status = __raw_readl(mcs814x_intc_base + MCS814X_IRQ_STS0);
|
||
|
|
if (!status)
|
||
|
|
break;
|
||
|
|
|
||
|
|
irq = ffs(status) - 1;
|
||
|
|
status |= (1 << irq);
|
||
|
|
/* clear the interrupt */
|
||
|
|
__raw_writel(status, mcs814x_intc_base + MCS814X_IRQ_ICR);
|
||
|
|
/* call the generic handler */
|
||
|
|
handle_IRQ(irq, regs);
|
||
|
|
|
||
|
|
} while (1);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id mcs814x_intc_ids[] = {
|
||
|
|
{ .compatible = "moschip,mcs814x-intc" },
|
||
|
|
{ /* sentinel */ },
|
||
|
|
};
|
||
|
|
|
||
|
|
void __init mcs814x_of_irq_init(void)
|
||
|
|
{
|
||
|
|
struct device_node *np;
|
||
|
|
|
||
|
|
np = of_find_matching_node(NULL, mcs814x_intc_ids);
|
||
|
|
if (!np)
|
||
|
|
panic("unable to find compatible intc node in dtb\n");
|
||
|
|
|
||
|
|
mcs814x_intc_base = of_iomap(np, 0);
|
||
|
|
if (!mcs814x_intc_base)
|
||
|
|
panic("unable to map intc cpu registers\n");
|
||
|
|
|
||
|
|
irq_domain_add_simple(np, 0);
|
||
|
|
|
||
|
|
of_node_put(np);
|
||
|
|
|
||
|
|
mcs814x_alloc_gc(mcs814x_intc_base, 0, 32);
|
||
|
|
}
|
||
|
|
|