1 /*
2  * Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology
3  * Author: Fuxin Zhang, zhangfx@lemote.com
4  *
5  *  This program is free software; you can redistribute  it and/or modify it
6  *  under  the terms of  the GNU General  Public License as published by the
7  *  Free Software Foundation;  either version 2 of the  License, or (at your
8  *  option) any later version.
9  */
10 #include <linux/delay.h>
11 #include <linux/interrupt.h>
12 
13 #include <loongson.h>
14 /*
15  * the first level int-handler will jump here if it is a bonito irq
16  */
bonito_irqdispatch(void)17 void bonito_irqdispatch(void)
18 {
19 	u32 int_status;
20 	int i;
21 
22 	/* workaround the IO dma problem: let cpu looping to allow DMA finish */
23 	int_status = LOONGSON_INTISR;
24 	while (int_status & (1 << 10)) {
25 		udelay(1);
26 		int_status = LOONGSON_INTISR;
27 	}
28 
29 	/* Get pending sources, masked by current enables */
30 	int_status = LOONGSON_INTISR & LOONGSON_INTEN;
31 
32 	if (int_status) {
33 		i = __ffs(int_status);
34 		do_IRQ(LOONGSON_IRQ_BASE + i);
35 	}
36 }
37 
plat_irq_dispatch(void)38 asmlinkage void plat_irq_dispatch(void)
39 {
40 	unsigned int pending;
41 
42 	pending = read_c0_cause() & read_c0_status() & ST0_IM;
43 
44 	/* machine-specific plat_irq_dispatch */
45 	mach_irq_dispatch(pending);
46 }
47 
arch_init_irq(void)48 void __init arch_init_irq(void)
49 {
50 	/*
51 	 * Clear all of the interrupts while we change the able around a bit.
52 	 * int-handler is not on bootstrap
53 	 */
54 	clear_c0_status(ST0_IM | ST0_BEV);
55 
56 	/* no steer */
57 	LOONGSON_INTSTEER = 0;
58 
59 	/*
60 	 * Mask out all interrupt by writing "1" to all bit position in
61 	 * the interrupt reset reg.
62 	 */
63 	LOONGSON_INTENCLR = ~0;
64 
65 	/* machine specific irq init */
66 	mach_init_irq();
67 }
68