2 * Copyright (C) 2011-12 Synopsys, Inc. (www.synopsys.com)
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
10 #include <linux/interrupt.h>
11 #include <linux/irqchip.h>
12 #include <asm/mach_desc.h>
15 * Late Interrupt system init called from start_kernel for Boot CPU only
17 * Since slab must already be initialized, platforms can start doing any
18 * needed request_irq( )s
20 void __init init_IRQ(void)
22 /* Any external intc can be setup here */
23 if (machine_desc->init_irq)
24 machine_desc->init_irq();
26 /* process the entire interrupt tree in one go */
30 /* Master CPU can initialize it's side of IPI */
31 if (machine_desc->init_smp)
32 machine_desc->init_smp(smp_processor_id());
37 * "C" Entry point for any ARC ISR, called from low level vector handler
38 * @irq is the vector number read from ICAUSE reg of on-chip intc
40 void arch_do_IRQ(unsigned int irq, struct pt_regs *regs)
42 struct pt_regs *old_regs = set_irq_regs(regs);
45 generic_handle_irq(irq);
47 set_irq_regs(old_regs);
50 void arc_request_percpu_irq(int irq, int cpu,
51 irqreturn_t (*isr)(int irq, void *dev),
55 /* Boot cpu calls request, all call enable */
60 * These 2 calls are essential to making percpu IRQ APIs work
61 * Ideally these details could be hidden in irq chip map function
62 * but the issue is IPIs IRQs being static (non-DT) and platform
63 * specific, so we can't identify them there.
65 irq_set_percpu_devid(irq);
66 irq_modify_status(irq, IRQ_NOAUTOEN, 0); /* @irq, @clr, @set */
68 rc = request_percpu_irq(irq, isr, irq_nm, percpu_dev);
70 panic("Percpu IRQ request failed for %d\n", irq);
73 enable_percpu_irq(irq, 0);