Linux Kernel  3.7.1
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irq-rm7000.c
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1 /*
2  * Copyright (C) 2003 Ralf Baechle
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License as published by the
6  * Free Software Foundation; either version 2 of the License, or (at your
7  * option) any later version.
8  *
9  * Handler for RM7000 extended interrupts. These are a non-standard
10  * feature so we handle them separately from standard interrupts.
11  */
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/irq.h>
15 #include <linux/kernel.h>
16 
17 #include <asm/irq_cpu.h>
18 #include <asm/mipsregs.h>
19 
20 static inline void unmask_rm7k_irq(struct irq_data *d)
21 {
22  set_c0_intcontrol(0x100 << (d->irq - RM7K_CPU_IRQ_BASE));
23 }
24 
25 static inline void mask_rm7k_irq(struct irq_data *d)
26 {
27  clear_c0_intcontrol(0x100 << (d->irq - RM7K_CPU_IRQ_BASE));
28 }
29 
30 static struct irq_chip rm7k_irq_controller = {
31  .name = "RM7000",
32  .irq_ack = mask_rm7k_irq,
33  .irq_mask = mask_rm7k_irq,
34  .irq_mask_ack = mask_rm7k_irq,
35  .irq_unmask = unmask_rm7k_irq,
36  .irq_eoi = unmask_rm7k_irq
37 };
38 
40 {
41  int base = RM7K_CPU_IRQ_BASE;
42  int i;
43 
44  clear_c0_intcontrol(0x00000f00); /* Mask all */
45 
46  for (i = base; i < base + 4; i++)
47  irq_set_chip_and_handler(i, &rm7k_irq_controller,
49 }