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>
16 * Late Interrupt system init called from start_kernel for Boot CPU only
18 * Since slab must already be initialized, platforms can start doing any
19 * needed request_irq( )s
21 void __init init_IRQ(void)
24 * process the entire interrupt tree in one go
25 * Any external intc will be setup provided DT chains them
31 /* a SMP H/w block could do IPI IRQ request here */
32 if (plat_smp_ops.init_irq_cpu)
33 plat_smp_ops.init_irq_cpu(smp_processor_id());
35 if (machine_desc->init_cpu_smp)
36 machine_desc->init_cpu_smp(smp_processor_id());
41 * "C" Entry point for any ARC ISR, called from low level vector handler
42 * @irq is the vector number read from ICAUSE reg of on-chip intc
44 void arch_do_IRQ(unsigned int irq, struct pt_regs *regs)
46 struct pt_regs *old_regs = set_irq_regs(regs);
49 generic_handle_irq(irq);
51 set_irq_regs(old_regs);
54 void arc_request_percpu_irq(int irq, int cpu,
55 irqreturn_t (*isr)(int irq, void *dev),
59 /* Boot cpu calls request, all call enable */
64 * These 2 calls are essential to making percpu IRQ APIs work
65 * Ideally these details could be hidden in irq chip map function
66 * but the issue is IPIs IRQs being static (non-DT) and platform
67 * specific, so we can't identify them there.
69 irq_set_percpu_devid(irq);
70 irq_modify_status(irq, IRQ_NOAUTOEN, 0); /* @irq, @clr, @set */
72 rc = request_percpu_irq(irq, isr, irq_nm, percpu_dev);
74 panic("Percpu IRQ request failed for %d\n", irq);
77 enable_percpu_irq(irq, 0);