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1// SPDX-License-Identifier: GPL-2.0-only
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 *
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 *
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 */
21#include <linux/kernel_stat.h>
22#include <linux/signal.h>
23#include <linux/ioport.h>
24#include <linux/interrupt.h>
25#include <linux/irq.h>
26#include <linux/irqchip.h>
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>
35#include <linux/export.h>
36
37#include <asm/hardware/cache-l2x0.h>
38#include <asm/hardware/cache-uniphier.h>
39#include <asm/outercache.h>
40#include <asm/exception.h>
41#include <asm/mach/arch.h>
42#include <asm/mach/irq.h>
43#include <asm/mach/time.h>
44
45unsigned long irq_err_count;
46
47int arch_show_interrupts(struct seq_file *p, int prec)
48{
49#ifdef CONFIG_FIQ
50 show_fiq_list(p, prec);
51#endif
52#ifdef CONFIG_SMP
53 show_ipi_list(p, prec);
54#endif
55 seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
56 return 0;
57}
58
59/*
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.
64 */
65void handle_IRQ(unsigned int irq, struct pt_regs *regs)
66{
67 __handle_domain_irq(NULL, irq, false, regs);
68}
69
70/*
71 * asm_do_IRQ is the interface to be used from assembly code.
72 */
73asmlinkage void __exception_irq_entry
74asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
75{
76 handle_IRQ(irq, regs);
77}
78
79void __init init_IRQ(void)
80{
81 int ret;
82
83 if (IS_ENABLED(CONFIG_OF) && !machine_desc->init_irq)
84 irqchip_init();
85 else
86 machine_desc->init_irq();
87
88 if (IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_CACHE_L2X0) &&
89 (machine_desc->l2c_aux_mask || machine_desc->l2c_aux_val)) {
90 if (!outer_cache.write_sec)
91 outer_cache.write_sec = machine_desc->l2c_write_sec;
92 ret = l2x0_of_init(machine_desc->l2c_aux_val,
93 machine_desc->l2c_aux_mask);
94 if (ret && ret != -ENODEV)
95 pr_err("L2C: failed to init: %d\n", ret);
96 }
97
98 uniphier_cache_init();
99}
100
101#ifdef CONFIG_SPARSE_IRQ
102int __init arch_probe_nr_irqs(void)
103{
104 nr_irqs = machine_desc->nr_irqs ? machine_desc->nr_irqs : NR_IRQS;
105 return nr_irqs;
106}
107#endif
1// SPDX-License-Identifier: GPL-2.0-only
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 *
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 *
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 */
21#include <linux/signal.h>
22#include <linux/ioport.h>
23#include <linux/interrupt.h>
24#include <linux/irq.h>
25#include <linux/irqchip.h>
26#include <linux/random.h>
27#include <linux/smp.h>
28#include <linux/init.h>
29#include <linux/seq_file.h>
30#include <linux/errno.h>
31#include <linux/list.h>
32#include <linux/kallsyms.h>
33#include <linux/proc_fs.h>
34#include <linux/export.h>
35
36#include <asm/hardware/cache-l2x0.h>
37#include <asm/hardware/cache-uniphier.h>
38#include <asm/outercache.h>
39#include <asm/exception.h>
40#include <asm/mach/arch.h>
41#include <asm/mach/irq.h>
42#include <asm/mach/time.h>
43
44unsigned long irq_err_count;
45
46int arch_show_interrupts(struct seq_file *p, int prec)
47{
48#ifdef CONFIG_FIQ
49 show_fiq_list(p, prec);
50#endif
51#ifdef CONFIG_SMP
52 show_ipi_list(p, prec);
53#endif
54 seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
55 return 0;
56}
57
58/*
59 * handle_IRQ handles all hardware IRQ's. Decoded IRQs should
60 * not come via this function. Instead, they should provide their
61 * own 'handler'. Used by platform code implementing C-based 1st
62 * level decoding.
63 */
64void handle_IRQ(unsigned int irq, struct pt_regs *regs)
65{
66 struct pt_regs *old_regs = set_irq_regs(regs);
67 struct irq_desc *desc;
68
69 irq_enter();
70
71 /*
72 * Some hardware gives randomly wrong interrupts. Rather
73 * than crashing, do something sensible.
74 */
75 if (unlikely(!irq || irq >= nr_irqs))
76 desc = NULL;
77 else
78 desc = irq_to_desc(irq);
79
80 if (likely(desc))
81 handle_irq_desc(desc);
82 else
83 ack_bad_irq(irq);
84
85 irq_exit();
86 set_irq_regs(old_regs);
87}
88
89/*
90 * asm_do_IRQ is the interface to be used from assembly code.
91 */
92asmlinkage void __exception_irq_entry
93asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
94{
95 handle_IRQ(irq, regs);
96}
97
98void __init init_IRQ(void)
99{
100 int ret;
101
102 if (IS_ENABLED(CONFIG_OF) && !machine_desc->init_irq)
103 irqchip_init();
104 else
105 machine_desc->init_irq();
106
107 if (IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_CACHE_L2X0) &&
108 (machine_desc->l2c_aux_mask || machine_desc->l2c_aux_val)) {
109 if (!outer_cache.write_sec)
110 outer_cache.write_sec = machine_desc->l2c_write_sec;
111 ret = l2x0_of_init(machine_desc->l2c_aux_val,
112 machine_desc->l2c_aux_mask);
113 if (ret && ret != -ENODEV)
114 pr_err("L2C: failed to init: %d\n", ret);
115 }
116
117 uniphier_cache_init();
118}
119
120#ifdef CONFIG_SPARSE_IRQ
121int __init arch_probe_nr_irqs(void)
122{
123 nr_irqs = machine_desc->nr_irqs ? machine_desc->nr_irqs : NR_IRQS;
124 return nr_irqs;
125}
126#endif