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/*
* arch/arm/plat-orion/irq.c
*
* Marvell Orion SoC IRQ handling.
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/io.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <asm/exception.h>
#include <plat/irq.h>
#include <plat/orion-gpio.h>
#include <mach/bridge-regs.h>
#ifdef CONFIG_MULTI_IRQ_HANDLER
/*
* Compiling with both non-DT and DT support enabled, will
* break asm irq handler used by non-DT boards. Therefore,
* we provide a C-style irq handler even for non-DT boards,
* if MULTI_IRQ_HANDLER is set.
*
* Notes:
* - this is prepared for Kirkwood and Dove only, update
* accordingly if you add Orion5x or MV78x00.
* - Orion5x uses different macro names and has only one
* set of CAUSE/MASK registers.
* - MV78x00 uses the same macro names but has a third
* set of CAUSE/MASK registers.
*
*/
static void __iomem *orion_irq_base = IRQ_VIRT_BASE;
asmlinkage void
__exception_irq_entry orion_legacy_handle_irq(struct pt_regs *regs)
{
u32 stat;
stat = readl_relaxed(orion_irq_base + IRQ_CAUSE_LOW_OFF);
stat &= readl_relaxed(orion_irq_base + IRQ_MASK_LOW_OFF);
if (stat) {
unsigned int hwirq = __fls(stat);
handle_IRQ(hwirq, regs);
return;
}
stat = readl_relaxed(orion_irq_base + IRQ_CAUSE_HIGH_OFF);
stat &= readl_relaxed(orion_irq_base + IRQ_MASK_HIGH_OFF);
if (stat) {
unsigned int hwirq = 32 + __fls(stat);
handle_IRQ(hwirq, regs);
return;
}
}
#endif
void __init orion_irq_init(unsigned int irq_start, void __iomem *maskaddr)
{
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
/*
* Mask all interrupts initially.
*/
writel(0, maskaddr);
gc = irq_alloc_generic_chip("orion_irq", 1, irq_start, maskaddr,
handle_level_irq);
ct = gc->chip_types;
ct->chip.irq_mask = irq_gc_mask_clr_bit;
ct->chip.irq_unmask = irq_gc_mask_set_bit;
irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_MASK_CACHE,
IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
#ifdef CONFIG_MULTI_IRQ_HANDLER
set_handle_irq(orion_legacy_handle_irq);
#endif
}
#ifdef CONFIG_OF
static int __init orion_add_irq_domain(struct device_node *np,
struct device_node *interrupt_parent)
{
int i = 0;
void __iomem *base;
do {
base = of_iomap(np, i);
if (base) {
orion_irq_init(i * 32, base + 0x04);
i++;
}
} while (base);
irq_domain_add_legacy(np, i * 32, 0, 0,
&irq_domain_simple_ops, NULL);
return 0;
}
static const struct of_device_id orion_irq_match[] = {
{ .compatible = "marvell,orion-intc",
.data = orion_add_irq_domain, },
{},
};
void __init orion_dt_init_irq(void)
{
of_irq_init(orion_irq_match);
}
#endif
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