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/*
* Copyright (C) 2011-12 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/interrupt.h>
#include <linux/irqchip.h>
#include <asm/mach_desc.h>
/*
* Late Interrupt system init called from start_kernel for Boot CPU only
*
* Since slab must already be initialized, platforms can start doing any
* needed request_irq( )s
*/
void __init init_IRQ(void)
{
/*
* process the entire interrupt tree in one go
* Any external intc will be setup provided DT chains them
* properly
*/
irqchip_init();
#ifdef CONFIG_SMP
/* Master CPU can initialize it's side of IPI */
if (machine_desc->init_smp)
machine_desc->init_smp(smp_processor_id());
#endif
}
/*
* "C" Entry point for any ARC ISR, called from low level vector handler
* @irq is the vector number read from ICAUSE reg of on-chip intc
*/
void arch_do_IRQ(unsigned int irq, struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
irq_enter();
generic_handle_irq(irq);
irq_exit();
set_irq_regs(old_regs);
}
void arc_request_percpu_irq(int irq, int cpu,
irqreturn_t (*isr)(int irq, void *dev),
const char *irq_nm,
void *percpu_dev)
{
/* Boot cpu calls request, all call enable */
if (!cpu) {
int rc;
/*
* These 2 calls are essential to making percpu IRQ APIs work
* Ideally these details could be hidden in irq chip map function
* but the issue is IPIs IRQs being static (non-DT) and platform
* specific, so we can't identify them there.
*/
irq_set_percpu_devid(irq);
irq_modify_status(irq, IRQ_NOAUTOEN, 0); /* @irq, @clr, @set */
rc = request_percpu_irq(irq, isr, irq_nm, percpu_dev);
if (rc)
panic("Percpu IRQ request failed for %d\n", irq);
}
enable_percpu_irq(irq, 0);
}
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