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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/arch/arm/kernel/irq.c | |
4 | * | |
5 | * Copyright (C) 1992 Linus Torvalds | |
6 | * Modifications for ARM processor Copyright (C) 1995-2000 Russell King. | |
7 | * | |
8749af68 RK |
8 | * Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation. |
9 | * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and | |
10 | * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>. | |
11 | * | |
1da177e4 LT |
12 | * This file contains the code used by various IRQ handling routines: |
13 | * asking for different IRQ's should be done through these routines | |
14 | * instead of just grabbing them. Thus setups with different IRQ numbers | |
15 | * shouldn't result in any weird surprises, and installing new handlers | |
16 | * should be easier. | |
17 | * | |
18 | * IRQ's are in fact implemented a bit like signal handlers for the kernel. | |
19 | * Naturally it's not a 1:1 relation, but there are similarities. | |
20 | */ | |
1da177e4 | 21 | #include <linux/kernel_stat.h> |
1da177e4 LT |
22 | #include <linux/signal.h> |
23 | #include <linux/ioport.h> | |
24 | #include <linux/interrupt.h> | |
4a2581a0 | 25 | #include <linux/irq.h> |
ebafed7a | 26 | #include <linux/irqchip.h> |
1da177e4 LT |
27 | #include <linux/random.h> |
28 | #include <linux/smp.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/seq_file.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/list.h> | |
33 | #include <linux/kallsyms.h> | |
34 | #include <linux/proc_fs.h> | |
05c76982 | 35 | #include <linux/export.h> |
1da177e4 | 36 | |
805604ef | 37 | #include <asm/hardware/cache-l2x0.h> |
e7ecbc05 | 38 | #include <asm/hardware/cache-uniphier.h> |
f8130906 | 39 | #include <asm/outercache.h> |
5a567d78 | 40 | #include <asm/exception.h> |
8ff1443c | 41 | #include <asm/mach/arch.h> |
897d8527 | 42 | #include <asm/mach/irq.h> |
8749af68 | 43 | #include <asm/mach/time.h> |
1da177e4 | 44 | |
4a2581a0 | 45 | unsigned long irq_err_count; |
1da177e4 | 46 | |
25a5662a | 47 | int arch_show_interrupts(struct seq_file *p, int prec) |
1da177e4 | 48 | { |
baa28e35 | 49 | #ifdef CONFIG_FIQ |
25a5662a | 50 | show_fiq_list(p, prec); |
1da177e4 LT |
51 | #endif |
52 | #ifdef CONFIG_SMP | |
25a5662a | 53 | show_ipi_list(p, prec); |
1da177e4 | 54 | #endif |
25a5662a | 55 | seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count); |
1da177e4 LT |
56 | return 0; |
57 | } | |
58 | ||
1da177e4 | 59 | /* |
a4841e39 RKAL |
60 | * handle_IRQ handles all hardware IRQ's. Decoded IRQs should |
61 | * not come via this function. Instead, they should provide their | |
62 | * own 'handler'. Used by platform code implementing C-based 1st | |
63 | * level decoding. | |
1da177e4 | 64 | */ |
a4841e39 | 65 | void handle_IRQ(unsigned int irq, struct pt_regs *regs) |
1da177e4 | 66 | { |
a71b092a | 67 | __handle_domain_irq(NULL, irq, false, regs); |
1da177e4 LT |
68 | } |
69 | ||
a4841e39 RKAL |
70 | /* |
71 | * asm_do_IRQ is the interface to be used from assembly code. | |
72 | */ | |
73 | asmlinkage void __exception_irq_entry | |
74 | asm_do_IRQ(unsigned int irq, struct pt_regs *regs) | |
75 | { | |
76 | handle_IRQ(irq, regs); | |
77 | } | |
78 | ||
1da177e4 LT |
79 | void __init init_IRQ(void) |
80 | { | |
805604ef RK |
81 | int ret; |
82 | ||
ebafed7a MR |
83 | if (IS_ENABLED(CONFIG_OF) && !machine_desc->init_irq) |
84 | irqchip_init(); | |
85 | else | |
86 | machine_desc->init_irq(); | |
805604ef RK |
87 | |
88 | if (IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_CACHE_L2X0) && | |
89 | (machine_desc->l2c_aux_mask || machine_desc->l2c_aux_val)) { | |
0c4c2edc TF |
90 | if (!outer_cache.write_sec) |
91 | outer_cache.write_sec = machine_desc->l2c_write_sec; | |
805604ef RK |
92 | ret = l2x0_of_init(machine_desc->l2c_aux_val, |
93 | machine_desc->l2c_aux_mask); | |
9023cc82 | 94 | if (ret && ret != -ENODEV) |
805604ef RK |
95 | pr_err("L2C: failed to init: %d\n", ret); |
96 | } | |
e7ecbc05 MY |
97 | |
98 | uniphier_cache_init(); | |
1da177e4 LT |
99 | } |
100 | ||
354e6f72 | 101 | #ifdef CONFIG_SPARSE_IRQ |
102 | int __init arch_probe_nr_irqs(void) | |
103 | { | |
8ff1443c | 104 | nr_irqs = machine_desc->nr_irqs ? machine_desc->nr_irqs : NR_IRQS; |
b683de2b | 105 | return nr_irqs; |
354e6f72 | 106 | } |
107 | #endif |