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 }
66
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