forked from Minki/linux
286130ebf1
Note this is not part of platform owned static machine_desc, but more of device owned plat_smp_ops (rather misnamed) which a IPI provider or some such typically defines. This will help us seperate out the IPI registration from platform specific init_cpu_smp() into device specific init_irq_cpu() Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
79 lines
2.0 KiB
C
79 lines
2.0 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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/*
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* These 2 calls are essential to making percpu IRQ APIs work
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* Ideally these details could be hidden in irq chip map function
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* but the issue is IPIs IRQs being static (non-DT) and platform
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* specific, so we can't identify them there.
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*/
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irq_set_percpu_devid(irq);
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irq_modify_status(irq, IRQ_NOAUTOEN, 0); /* @irq, @clr, @set */
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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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