arm64: IRQ handling
This patch adds the support for IRQ handling. The actual interrupt controller will be part of a separate patch (going into drivers/irqchip/). Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
This commit is contained in:
Marc Zyngier
Catalin Marinas
parent
58d0ba578b
commit
fb9bd7d6df
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/*
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* Copyright (C) 2012 ARM Ltd.
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_HARDIRQ_H
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#define __ASM_HARDIRQ_H
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#include <linux/cache.h>
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#include <linux/threads.h>
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#include <asm/irq.h>
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typedef struct {
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unsigned int __softirq_pending;
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} ____cacheline_aligned irq_cpustat_t;
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#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
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#define __inc_irq_stat(cpu, member) __IRQ_STAT(cpu, member)++
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#define __get_irq_stat(cpu, member) __IRQ_STAT(cpu, member)
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#ifdef CONFIG_SMP
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u64 smp_irq_stat_cpu(unsigned int cpu);
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#define arch_irq_stat_cpu smp_irq_stat_cpu
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#endif
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#define __ARCH_IRQ_EXIT_IRQS_DISABLED 1
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static inline void ack_bad_irq(unsigned int irq)
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{
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extern unsigned long irq_err_count;
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irq_err_count++;
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}
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extern void handle_IRQ(unsigned int, struct pt_regs *);
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#endif /* __ASM_HARDIRQ_H */
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#ifndef __ASM_IRQ_H
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#define __ASM_IRQ_H
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#include <asm-generic/irq.h>
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extern void (*handle_arch_irq)(struct pt_regs *);
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#endif
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/*
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* Copyright (C) 2012 ARM Ltd.
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_IRQFLAGS_H
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#define __ASM_IRQFLAGS_H
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#ifdef __KERNEL__
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#include <asm/ptrace.h>
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/*
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* CPU interrupt mask handling.
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*/
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static inline unsigned long arch_local_irq_save(void)
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{
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unsigned long flags;
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asm volatile(
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"mrs %0, daif // arch_local_irq_save\n"
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"msr daifset, #2"
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: "=r" (flags)
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:
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: "memory");
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return flags;
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}
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static inline void arch_local_irq_enable(void)
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{
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asm volatile(
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"msr daifclr, #2 // arch_local_irq_enable"
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:
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:
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: "memory");
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}
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static inline void arch_local_irq_disable(void)
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{
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asm volatile(
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"msr daifset, #2 // arch_local_irq_disable"
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:
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:
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: "memory");
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}
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#define local_fiq_enable() asm("msr daifclr, #1" : : : "memory")
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#define local_fiq_disable() asm("msr daifset, #1" : : : "memory")
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/*
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* Save the current interrupt enable state.
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*/
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static inline unsigned long arch_local_save_flags(void)
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{
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unsigned long flags;
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asm volatile(
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"mrs %0, daif // arch_local_save_flags"
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: "=r" (flags)
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:
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: "memory");
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return flags;
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}
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/*
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* restore saved IRQ state
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*/
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static inline void arch_local_irq_restore(unsigned long flags)
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{
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asm volatile(
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"msr daif, %0 // arch_local_irq_restore"
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:
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: "r" (flags)
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: "memory");
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}
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static inline int arch_irqs_disabled_flags(unsigned long flags)
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{
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return flags & PSR_I_BIT;
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}
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#endif
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#endif
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/*
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* Based on arch/arm/kernel/irq.c
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*
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* Copyright (C) 1992 Linus Torvalds
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* Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
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* Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation.
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* Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and
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* Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
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* Copyright (C) 2012 ARM Ltd.
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel_stat.h>
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#include <linux/irq.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/of_irq.h>
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#include <linux/seq_file.h>
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#include <linux/ratelimit.h>
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unsigned long irq_err_count;
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int arch_show_interrupts(struct seq_file *p, int prec)
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{
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#ifdef CONFIG_SMP
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show_ipi_list(p, prec);
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#endif
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seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
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return 0;
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}
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/*
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* handle_IRQ handles all hardware IRQ's. Decoded IRQs should
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* not come via this function. Instead, they should provide their
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* own 'handler'. Used by platform code implementing C-based 1st
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* level decoding.
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*/
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void handle_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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/*
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* Some hardware gives randomly wrong interrupts. Rather
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* than crashing, do something sensible.
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*/
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if (unlikely(irq >= nr_irqs)) {
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pr_warn_ratelimited("Bad IRQ%u\n", irq);
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ack_bad_irq(irq);
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} else {
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generic_handle_irq(irq);
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}
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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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* Interrupt controllers supported by the kernel.
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*/
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static const struct of_device_id intctrl_of_match[] __initconst = {
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/* IRQ controllers { .compatible, .data } info to go here */
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{}
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};
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void __init init_IRQ(void)
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{
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of_irq_init(intctrl_of_match);
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if (!handle_arch_irq)
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panic("No interrupt controller found.");
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}
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