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5bf704c204
arc_request_percpu_irq() is called by all cores to request/enable percpu irq. It has some "prep" calls needed by genirq: - setup percpu devid - disable IRQ_NOAUTOEN However given that enable_percpu_irq() is called enayways, latter can be avoided. We are now left with irq_set_percpu_devid() quirk and that too for ARCompact builds only, since previous patch updated ARCv2 intc to do this in the "right" place, i.e. irq map function. By next release, this will ultimately be fixed for ARCompact as well. Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Alexey Brodkin <abrodkin@synopsys.com> Cc: linux-snps-arc@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
81 lines
2 KiB
C
81 lines
2 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_irq_cpu)
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plat_smp_ops.init_irq_cpu(smp_processor_id());
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if (machine_desc->init_cpu_smp)
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machine_desc->init_cpu_smp(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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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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