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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/softirq_stack.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
45#include "reboot.h"
46
47unsigned long irq_err_count;
48
49#ifdef CONFIG_IRQSTACKS
50
51asmlinkage DEFINE_PER_CPU_READ_MOSTLY(u8 *, irq_stack_ptr);
52
53static void __init init_irq_stacks(void)
54{
55 u8 *stack;
56 int cpu;
57
58 for_each_possible_cpu(cpu) {
59 if (!IS_ENABLED(CONFIG_VMAP_STACK))
60 stack = (u8 *)__get_free_pages(GFP_KERNEL,
61 THREAD_SIZE_ORDER);
62 else
63 stack = __vmalloc_node(THREAD_SIZE, THREAD_ALIGN,
64 THREADINFO_GFP, NUMA_NO_NODE,
65 __builtin_return_address(0));
66
67 if (WARN_ON(!stack))
68 break;
69 per_cpu(irq_stack_ptr, cpu) = &stack[THREAD_SIZE];
70 }
71}
72
73#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
74static void ____do_softirq(void *arg)
75{
76 __do_softirq();
77}
78
79void do_softirq_own_stack(void)
80{
81 call_with_stack(____do_softirq, NULL,
82 __this_cpu_read(irq_stack_ptr));
83}
84#endif
85#endif
86
87int arch_show_interrupts(struct seq_file *p, int prec)
88{
89#ifdef CONFIG_FIQ
90 show_fiq_list(p, prec);
91#endif
92#ifdef CONFIG_SMP
93 show_ipi_list(p, prec);
94#endif
95 seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
96 return 0;
97}
98
99/*
100 * handle_IRQ handles all hardware IRQ's. Decoded IRQs should
101 * not come via this function. Instead, they should provide their
102 * own 'handler'. Used by platform code implementing C-based 1st
103 * level decoding.
104 */
105void handle_IRQ(unsigned int irq, struct pt_regs *regs)
106{
107 struct irq_desc *desc;
108
109 /*
110 * Some hardware gives randomly wrong interrupts. Rather
111 * than crashing, do something sensible.
112 */
113 if (unlikely(!irq || irq >= nr_irqs))
114 desc = NULL;
115 else
116 desc = irq_to_desc(irq);
117
118 if (likely(desc))
119 handle_irq_desc(desc);
120 else
121 ack_bad_irq(irq);
122}
123
124void __init init_IRQ(void)
125{
126 int ret;
127
128#ifdef CONFIG_IRQSTACKS
129 init_irq_stacks();
130#endif
131
132 if (IS_ENABLED(CONFIG_OF) && !machine_desc->init_irq)
133 irqchip_init();
134 else
135 machine_desc->init_irq();
136
137 if (IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_CACHE_L2X0) &&
138 (machine_desc->l2c_aux_mask || machine_desc->l2c_aux_val)) {
139 if (!outer_cache.write_sec)
140 outer_cache.write_sec = machine_desc->l2c_write_sec;
141 ret = l2x0_of_init(machine_desc->l2c_aux_val,
142 machine_desc->l2c_aux_mask);
143 if (ret && ret != -ENODEV)
144 pr_err("L2C: failed to init: %d\n", ret);
145 }
146
147 uniphier_cache_init();
148}
149
150#ifdef CONFIG_SPARSE_IRQ
151int __init arch_probe_nr_irqs(void)
152{
153 nr_irqs = machine_desc->nr_irqs ? machine_desc->nr_irqs : NR_IRQS;
154 return nr_irqs;
155}
156#endif