1 // SPDX-License-Identifier: GPL-2.0 !! 1 /*
2 // Copyright (C) 2018 Hangzhou C-SKY Microsyst !! 2 * This file is subject to the terms and conditions of the GNU General Public
3 !! 3 * License. See the file "COPYING" in the main directory of this archive
>> 4 * for more details.
>> 5 *
>> 6 * Code to handle x86 style IRQs plus some generic interrupt stuff.
>> 7 *
>> 8 * Copyright (C) 1992 Linus Torvalds
>> 9 * Copyright (C) 1994 - 2000 Ralf Baechle
>> 10 */
>> 11 #include <linux/kernel.h>
>> 12 #include <linux/delay.h>
4 #include <linux/init.h> 13 #include <linux/init.h>
5 #include <linux/interrupt.h> 14 #include <linux/interrupt.h>
6 #include <linux/irq.h> !! 15 #include <linux/kernel_stat.h>
7 #include <linux/irqchip.h> !! 16 #include <linux/module.h>
8 #include <asm/traps.h> !! 17 #include <linux/proc_fs.h>
9 #include <asm/smp.h> !! 18 #include <linux/slab.h>
>> 19 #include <linux/mm.h>
>> 20 #include <linux/random.h>
>> 21 #include <linux/sched.h>
>> 22 #include <linux/seq_file.h>
>> 23 #include <linux/kallsyms.h>
>> 24 #include <linux/kgdb.h>
>> 25
>> 26 #include <asm/atomic.h>
>> 27 #include <asm/system.h>
>> 28 #include <asm/uaccess.h>
>> 29
>> 30 #ifdef CONFIG_KGDB
>> 31 int kgdb_early_setup;
>> 32 #endif
>> 33
>> 34 static unsigned long irq_map[NR_IRQS / BITS_PER_LONG];
>> 35
>> 36 int allocate_irqno(void)
>> 37 {
>> 38 int irq;
>> 39
>> 40 again:
>> 41 irq = find_first_zero_bit(irq_map, NR_IRQS);
>> 42
>> 43 if (irq >= NR_IRQS)
>> 44 return -ENOSPC;
>> 45
>> 46 if (test_and_set_bit(irq, irq_map))
>> 47 goto again;
>> 48
>> 49 return irq;
>> 50 }
>> 51
>> 52 /*
>> 53 * Allocate the 16 legacy interrupts for i8259 devices. This happens early
>> 54 * in the kernel initialization so treating allocation failure as BUG() is
>> 55 * ok.
>> 56 */
>> 57 void __init alloc_legacy_irqno(void)
>> 58 {
>> 59 int i;
>> 60
>> 61 for (i = 0; i <= 16; i++)
>> 62 BUG_ON(test_and_set_bit(i, irq_map));
>> 63 }
>> 64
>> 65 void free_irqno(unsigned int irq)
>> 66 {
>> 67 smp_mb__before_clear_bit();
>> 68 clear_bit(irq, irq_map);
>> 69 smp_mb__after_clear_bit();
>> 70 }
>> 71
>> 72 /*
>> 73 * 'what should we do if we get a hw irq event on an illegal vector'.
>> 74 * each architecture has to answer this themselves.
>> 75 */
>> 76 void ack_bad_irq(unsigned int irq)
>> 77 {
>> 78 smtc_im_ack_irq(irq);
>> 79 printk("unexpected IRQ # %d\n", irq);
>> 80 }
>> 81
>> 82 atomic_t irq_err_count;
>> 83
>> 84 /*
>> 85 * Generic, controller-independent functions:
>> 86 */
>> 87
>> 88 int show_interrupts(struct seq_file *p, void *v)
>> 89 {
>> 90 int i = *(loff_t *) v, j;
>> 91 struct irqaction * action;
>> 92 unsigned long flags;
>> 93
>> 94 if (i == 0) {
>> 95 seq_printf(p, " ");
>> 96 for_each_online_cpu(j)
>> 97 seq_printf(p, "CPU%d ", j);
>> 98 seq_putc(p, '\n');
>> 99 }
>> 100
>> 101 if (i < NR_IRQS) {
>> 102 spin_lock_irqsave(&irq_desc[i].lock, flags);
>> 103 action = irq_desc[i].action;
>> 104 if (!action)
>> 105 goto skip;
>> 106 seq_printf(p, "%3d: ", i);
>> 107 #ifndef CONFIG_SMP
>> 108 seq_printf(p, "%10u ", kstat_irqs(i));
>> 109 #else
>> 110 for_each_online_cpu(j)
>> 111 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
>> 112 #endif
>> 113 seq_printf(p, " %14s", irq_desc[i].chip->name);
>> 114 seq_printf(p, " %s", action->name);
>> 115
>> 116 for (action=action->next; action; action = action->next)
>> 117 seq_printf(p, ", %s", action->name);
>> 118
>> 119 seq_putc(p, '\n');
>> 120 skip:
>> 121 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
>> 122 } else if (i == NR_IRQS) {
>> 123 seq_putc(p, '\n');
>> 124 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
>> 125 }
>> 126 return 0;
>> 127 }
>> 128
>> 129 asmlinkage void spurious_interrupt(void)
>> 130 {
>> 131 atomic_inc(&irq_err_count);
>> 132 }
10 133
11 void __init init_IRQ(void) 134 void __init init_IRQ(void)
12 { 135 {
13 irqchip_init(); !! 136 int i;
14 #ifdef CONFIG_SMP !! 137
15 setup_smp_ipi(); !! 138 #ifdef CONFIG_KGDB
>> 139 if (kgdb_early_setup)
>> 140 return;
>> 141 #endif
>> 142
>> 143 for (i = 0; i < NR_IRQS; i++)
>> 144 set_irq_noprobe(i);
>> 145
>> 146 arch_init_irq();
>> 147
>> 148 #ifdef CONFIG_KGDB
>> 149 if (!kgdb_early_setup)
>> 150 kgdb_early_setup = 1;
16 #endif 151 #endif
17 } 152 }
18 153
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