GNU Linux-libre 5.13.14-gnu1
[releases.git] / arch / mips / loongson2ef / fuloong-2e / irq.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2007 Lemote Inc. & Institute of Computing Technology
4  * Author: Fuxin Zhang, zhangfx@lemote.com
5  */
6 #include <linux/interrupt.h>
7
8 #include <asm/irq_cpu.h>
9 #include <asm/i8259.h>
10
11 #include <loongson.h>
12
13 static void i8259_irqdispatch(void)
14 {
15         int irq;
16
17         irq = i8259_irq();
18         if (irq >= 0)
19                 do_IRQ(irq);
20         else
21                 spurious_interrupt();
22 }
23
24 asmlinkage void mach_irq_dispatch(unsigned int pending)
25 {
26         if (pending & CAUSEF_IP7)
27                 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
28         else if (pending & CAUSEF_IP6) /* perf counter loverflow */
29                 return;
30         else if (pending & CAUSEF_IP5)
31                 i8259_irqdispatch();
32         else if (pending & CAUSEF_IP2)
33                 bonito_irqdispatch();
34         else
35                 spurious_interrupt();
36 }
37
38 void __init mach_init_irq(void)
39 {
40         int irq;
41
42         /* init all controller
43          *   0-15         ------> i8259 interrupt
44          *   16-23        ------> mips cpu interrupt
45          *   32-63        ------> bonito irq
46          */
47
48         /* most bonito irq should be level triggered */
49         LOONGSON_INTEDGE = LOONGSON_ICU_SYSTEMERR | LOONGSON_ICU_MASTERERR |
50             LOONGSON_ICU_RETRYERR | LOONGSON_ICU_MBOXES;
51
52         /* Sets the first-level interrupt dispatcher. */
53         mips_cpu_irq_init();
54         init_i8259_irqs();
55         bonito_irq_init();
56
57         /* bonito irq at IP2 */
58         irq = MIPS_CPU_IRQ_BASE + 2;
59         if (request_irq(irq, no_action, IRQF_NO_THREAD, "cascade", NULL))
60                 pr_err("Failed to request irq %d (cascade)\n", irq);
61         /* 8259 irq at IP5 */
62         irq = MIPS_CPU_IRQ_BASE + 5;
63         if (request_irq(irq, no_action, IRQF_NO_THREAD, "cascade", NULL))
64                 pr_err("Failed to request irq %d (cascade)\n", irq);
65 }