94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/*
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* Copyright (C) 2011-12 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/interrupt.h>
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#include <linux/irqchip.h>
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#include <asm/mach_desc.h>
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#include <asm/smp.h>
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/*
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* Late Interrupt system init called from start_kernel for Boot CPU only
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*
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* Since slab must already be initialized, platforms can start doing any
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* needed request_irq( )s
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*/
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void __init init_IRQ(void)
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{
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/*
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* process the entire interrupt tree in one go
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* Any external intc will be setup provided DT chains them
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* properly
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*/
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irqchip_init();
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#ifdef CONFIG_SMP
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/* a SMP H/w block could do IPI IRQ request here */
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if (plat_smp_ops.init_per_cpu)
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plat_smp_ops.init_per_cpu(smp_processor_id());
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if (machine_desc->init_per_cpu)
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machine_desc->init_per_cpu(smp_processor_id());
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#endif
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}
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/*
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* "C" Entry point for any ARC ISR, called from low level vector handler
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* @irq is the vector number read from ICAUSE reg of on-chip intc
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*/
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void arch_do_IRQ(unsigned int irq, struct pt_regs *regs)
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{
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struct pt_regs *old_regs = set_irq_regs(regs);
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irq_enter();
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generic_handle_irq(irq);
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irq_exit();
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set_irq_regs(old_regs);
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}
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/*
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* API called for requesting percpu interrupts - called by each CPU
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* - For boot CPU, actually request the IRQ with genirq core + enables
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* - For subsequent callers only enable called locally
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*
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* Relies on being called by boot cpu first (i.e. request called ahead) of
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* any enable as expected by genirq. Hence Suitable only for TIMER, IPI
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* which are guaranteed to be setup on boot core first.
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* Late probed peripherals such as perf can't use this as there no guarantee
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* of being called on boot CPU first.
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*/
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void arc_request_percpu_irq(int irq, int cpu,
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irqreturn_t (*isr)(int irq, void *dev),
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const char *irq_nm,
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void *percpu_dev)
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{
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/* Boot cpu calls request, all call enable */
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if (!cpu) {
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int rc;
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#ifdef CONFIG_ISA_ARCOMPACT
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/*
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* A subsequent request_percpu_irq() fails if percpu_devid is
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* not set. That in turns sets NOAUTOEN, meaning each core needs
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* to call enable_percpu_irq()
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*
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* For ARCv2, this is done in irq map function since we know
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* which irqs are strictly per cpu
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*/
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irq_set_percpu_devid(irq);
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#endif
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rc = request_percpu_irq(irq, isr, irq_nm, percpu_dev);
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if (rc)
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panic("Percpu IRQ request failed for %d\n", irq);
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}
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enable_percpu_irq(irq, 0);
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}
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