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