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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 RM9000 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 #include <linux/module.h>
17 
18 #include <asm/irq_cpu.h>
19 #include <asm/mipsregs.h>
20 
unmask_rm9k_irq(struct irq_data * d)21 static inline void unmask_rm9k_irq(struct irq_data *d)
22 {
23 	set_c0_intcontrol(0x1000 << (d->irq - RM9K_CPU_IRQ_BASE));
24 }
25 
mask_rm9k_irq(struct irq_data * d)26 static inline void mask_rm9k_irq(struct irq_data *d)
27 {
28 	clear_c0_intcontrol(0x1000 << (d->irq - RM9K_CPU_IRQ_BASE));
29 }
30 
rm9k_cpu_irq_enable(struct irq_data * d)31 static inline void rm9k_cpu_irq_enable(struct irq_data *d)
32 {
33 	unsigned long flags;
34 
35 	local_irq_save(flags);
36 	unmask_rm9k_irq(d);
37 	local_irq_restore(flags);
38 }
39 
40 /*
41  * Performance counter interrupts are global on all processors.
42  */
local_rm9k_perfcounter_irq_startup(void * args)43 static void local_rm9k_perfcounter_irq_startup(void *args)
44 {
45 	rm9k_cpu_irq_enable(args);
46 }
47 
rm9k_perfcounter_irq_startup(struct irq_data * d)48 static unsigned int rm9k_perfcounter_irq_startup(struct irq_data *d)
49 {
50 	on_each_cpu(local_rm9k_perfcounter_irq_startup, d, 1);
51 
52 	return 0;
53 }
54 
local_rm9k_perfcounter_irq_shutdown(void * args)55 static void local_rm9k_perfcounter_irq_shutdown(void *args)
56 {
57 	unsigned long flags;
58 
59 	local_irq_save(flags);
60 	mask_rm9k_irq(args);
61 	local_irq_restore(flags);
62 }
63 
rm9k_perfcounter_irq_shutdown(struct irq_data * d)64 static void rm9k_perfcounter_irq_shutdown(struct irq_data *d)
65 {
66 	on_each_cpu(local_rm9k_perfcounter_irq_shutdown, d, 1);
67 }
68 
69 static struct irq_chip rm9k_irq_controller = {
70 	.name = "RM9000",
71 	.irq_ack = mask_rm9k_irq,
72 	.irq_mask = mask_rm9k_irq,
73 	.irq_mask_ack = mask_rm9k_irq,
74 	.irq_unmask = unmask_rm9k_irq,
75 	.irq_eoi = unmask_rm9k_irq
76 };
77 
78 static struct irq_chip rm9k_perfcounter_irq = {
79 	.name = "RM9000",
80 	.irq_startup = rm9k_perfcounter_irq_startup,
81 	.irq_shutdown = rm9k_perfcounter_irq_shutdown,
82 	.irq_ack = mask_rm9k_irq,
83 	.irq_mask = mask_rm9k_irq,
84 	.irq_mask_ack = mask_rm9k_irq,
85 	.irq_unmask = unmask_rm9k_irq,
86 };
87 
88 unsigned int rm9000_perfcount_irq;
89 
90 EXPORT_SYMBOL(rm9000_perfcount_irq);
91 
rm9k_cpu_irq_init(void)92 void __init rm9k_cpu_irq_init(void)
93 {
94 	int base = RM9K_CPU_IRQ_BASE;
95 	int i;
96 
97 	clear_c0_intcontrol(0x0000f000);		/* Mask all */
98 
99 	for (i = base; i < base + 4; i++)
100 		irq_set_chip_and_handler(i, &rm9k_irq_controller,
101 					 handle_level_irq);
102 
103 	rm9000_perfcount_irq = base + 1;
104 	irq_set_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,
105 				 handle_percpu_irq);
106 }
107