diff options
Diffstat (limited to 'arch/arm/kernel/irq.c')
| -rw-r--r-- | arch/arm/kernel/irq.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c new file mode 100644 index 000000000..fe28fc1f7 --- /dev/null +++ b/arch/arm/kernel/irq.c @@ -0,0 +1,156 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/arch/arm/kernel/irq.c + * + * Copyright (C) 1992 Linus Torvalds + * Modifications for ARM processor Copyright (C) 1995-2000 Russell King. + * + * Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation. + * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and + * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>. + * + * This file contains the code used by various IRQ handling routines: + * asking for different IRQ's should be done through these routines + * instead of just grabbing them. Thus setups with different IRQ numbers + * shouldn't result in any weird surprises, and installing new handlers + * should be easier. + * + * IRQ's are in fact implemented a bit like signal handlers for the kernel. + * Naturally it's not a 1:1 relation, but there are similarities. + */ +#include <linux/signal.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/irqchip.h> +#include <linux/random.h> +#include <linux/smp.h> +#include <linux/init.h> +#include <linux/seq_file.h> +#include <linux/errno.h> +#include <linux/list.h> +#include <linux/kallsyms.h> +#include <linux/proc_fs.h> +#include <linux/export.h> + +#include <asm/hardware/cache-l2x0.h> +#include <asm/hardware/cache-uniphier.h> +#include <asm/outercache.h> +#include <asm/softirq_stack.h> +#include <asm/exception.h> +#include <asm/mach/arch.h> +#include <asm/mach/irq.h> +#include <asm/mach/time.h> + +#include "reboot.h" + +unsigned long irq_err_count; + +#ifdef CONFIG_IRQSTACKS + +asmlinkage DEFINE_PER_CPU_READ_MOSTLY(u8 *, irq_stack_ptr); + +static void __init init_irq_stacks(void) +{ + u8 *stack; + int cpu; + + for_each_possible_cpu(cpu) { + if (!IS_ENABLED(CONFIG_VMAP_STACK)) + stack = (u8 *)__get_free_pages(GFP_KERNEL, + THREAD_SIZE_ORDER); + else + stack = __vmalloc_node(THREAD_SIZE, THREAD_ALIGN, + THREADINFO_GFP, NUMA_NO_NODE, + __builtin_return_address(0)); + + if (WARN_ON(!stack)) + break; + per_cpu(irq_stack_ptr, cpu) = &stack[THREAD_SIZE]; + } +} + +#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK +static void ____do_softirq(void *arg) +{ + __do_softirq(); +} + +void do_softirq_own_stack(void) +{ + call_with_stack(____do_softirq, NULL, + __this_cpu_read(irq_stack_ptr)); +} +#endif +#endif + +int arch_show_interrupts(struct seq_file *p, int prec) +{ +#ifdef CONFIG_FIQ + show_fiq_list(p, prec); +#endif +#ifdef CONFIG_SMP + show_ipi_list(p, prec); +#endif + seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count); + return 0; +} + +/* + * handle_IRQ handles all hardware IRQ's. Decoded IRQs should + * not come via this function. Instead, they should provide their + * own 'handler'. Used by platform code implementing C-based 1st + * level decoding. + */ +void handle_IRQ(unsigned int irq, struct pt_regs *regs) +{ + struct irq_desc *desc; + + /* + * Some hardware gives randomly wrong interrupts. Rather + * than crashing, do something sensible. + */ + if (unlikely(!irq || irq >= nr_irqs)) + desc = NULL; + else + desc = irq_to_desc(irq); + + if (likely(desc)) + handle_irq_desc(desc); + else + ack_bad_irq(irq); +} + +void __init init_IRQ(void) +{ + int ret; + +#ifdef CONFIG_IRQSTACKS + init_irq_stacks(); +#endif + + if (IS_ENABLED(CONFIG_OF) && !machine_desc->init_irq) + irqchip_init(); + else + machine_desc->init_irq(); + + if (IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_CACHE_L2X0) && + (machine_desc->l2c_aux_mask || machine_desc->l2c_aux_val)) { + if (!outer_cache.write_sec) + outer_cache.write_sec = machine_desc->l2c_write_sec; + ret = l2x0_of_init(machine_desc->l2c_aux_val, + machine_desc->l2c_aux_mask); + if (ret && ret != -ENODEV) + pr_err("L2C: failed to init: %d\n", ret); + } + + uniphier_cache_init(); +} + +#ifdef CONFIG_SPARSE_IRQ +int __init arch_probe_nr_irqs(void) +{ + nr_irqs = machine_desc->nr_irqs ? machine_desc->nr_irqs : NR_IRQS; + return nr_irqs; +} +#endif |