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1da177e4 LT |
1 | /* |
2 | * Copyright 2001 MontaVista Software Inc. | |
3 | * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net | |
4 | * | |
5 | * Copyright (C) 2001 Ralf Baechle | |
70342287 RB |
6 | * Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved. |
7 | * Author: Maciej W. Rozycki <macro@mips.com> | |
1da177e4 LT |
8 | * |
9 | * This file define the irq handler for MIPS CPU interrupts. | |
10 | * | |
70342287 RB |
11 | * This program is free software; you can redistribute it and/or modify it |
12 | * under the terms of the GNU General Public License as published by the | |
1da177e4 LT |
13 | * Free Software Foundation; either version 2 of the License, or (at your |
14 | * option) any later version. | |
15 | */ | |
16 | ||
17 | /* | |
18 | * Almost all MIPS CPUs define 8 interrupt sources. They are typically | |
19 | * level triggered (i.e., cannot be cleared from CPU; must be cleared from | |
20 | * device). The first two are software interrupts which we don't really | |
21 | * use or support. The last one is usually the CPU timer interrupt if | |
22 | * counter register is present or, for CPUs with an external FPU, by | |
23 | * convention it's the FPU exception interrupt. | |
24 | * | |
25 | * Don't even think about using this on SMP. You have been warned. | |
26 | * | |
27 | * This file exports one global function: | |
97dcb82d | 28 | * void mips_cpu_irq_init(void); |
1da177e4 LT |
29 | */ |
30 | #include <linux/init.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/kernel.h> | |
ca4d3e67 | 33 | #include <linux/irq.h> |
0916b469 | 34 | #include <linux/irqdomain.h> |
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35 | |
36 | #include <asm/irq_cpu.h> | |
37 | #include <asm/mipsregs.h> | |
d03d0a57 | 38 | #include <asm/mipsmtregs.h> |
1da177e4 | 39 | |
a93951c4 | 40 | static inline void unmask_mips_irq(struct irq_data *d) |
1da177e4 | 41 | { |
a93951c4 | 42 | set_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE)); |
569f75bd | 43 | irq_enable_hazard(); |
1da177e4 LT |
44 | } |
45 | ||
a93951c4 | 46 | static inline void mask_mips_irq(struct irq_data *d) |
1da177e4 | 47 | { |
a93951c4 | 48 | clear_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE)); |
569f75bd | 49 | irq_disable_hazard(); |
1da177e4 LT |
50 | } |
51 | ||
94dee171 | 52 | static struct irq_chip mips_cpu_irq_controller = { |
70d21cde | 53 | .name = "MIPS", |
a93951c4 TG |
54 | .irq_ack = mask_mips_irq, |
55 | .irq_mask = mask_mips_irq, | |
56 | .irq_mask_ack = mask_mips_irq, | |
57 | .irq_unmask = unmask_mips_irq, | |
58 | .irq_eoi = unmask_mips_irq, | |
1da177e4 LT |
59 | }; |
60 | ||
d03d0a57 RB |
61 | /* |
62 | * Basically the same as above but taking care of all the MT stuff | |
63 | */ | |
64 | ||
a93951c4 | 65 | static unsigned int mips_mt_cpu_irq_startup(struct irq_data *d) |
d03d0a57 RB |
66 | { |
67 | unsigned int vpflags = dvpe(); | |
68 | ||
a93951c4 | 69 | clear_c0_cause(0x100 << (d->irq - MIPS_CPU_IRQ_BASE)); |
d03d0a57 | 70 | evpe(vpflags); |
a93951c4 | 71 | unmask_mips_irq(d); |
d03d0a57 RB |
72 | return 0; |
73 | } | |
74 | ||
d03d0a57 RB |
75 | /* |
76 | * While we ack the interrupt interrupts are disabled and thus we don't need | |
77 | * to deal with concurrency issues. Same for mips_cpu_irq_end. | |
78 | */ | |
a93951c4 | 79 | static void mips_mt_cpu_irq_ack(struct irq_data *d) |
d03d0a57 RB |
80 | { |
81 | unsigned int vpflags = dvpe(); | |
a93951c4 | 82 | clear_c0_cause(0x100 << (d->irq - MIPS_CPU_IRQ_BASE)); |
d03d0a57 | 83 | evpe(vpflags); |
a93951c4 | 84 | mask_mips_irq(d); |
d03d0a57 RB |
85 | } |
86 | ||
94dee171 | 87 | static struct irq_chip mips_mt_cpu_irq_controller = { |
70d21cde | 88 | .name = "MIPS", |
a93951c4 TG |
89 | .irq_startup = mips_mt_cpu_irq_startup, |
90 | .irq_ack = mips_mt_cpu_irq_ack, | |
91 | .irq_mask = mask_mips_irq, | |
92 | .irq_mask_ack = mips_mt_cpu_irq_ack, | |
93 | .irq_unmask = unmask_mips_irq, | |
94 | .irq_eoi = unmask_mips_irq, | |
d03d0a57 | 95 | }; |
1da177e4 | 96 | |
85f7cdac AB |
97 | asmlinkage void __weak plat_irq_dispatch(void) |
98 | { | |
99 | unsigned long pending = read_c0_cause() & read_c0_status() & ST0_IM; | |
100 | int irq; | |
101 | ||
102 | if (!pending) { | |
103 | spurious_interrupt(); | |
104 | return; | |
105 | } | |
106 | ||
107 | pending >>= CAUSEB_IP; | |
108 | while (pending) { | |
109 | irq = fls(pending) - 1; | |
110 | do_IRQ(MIPS_CPU_IRQ_BASE + irq); | |
111 | pending &= ~BIT(irq); | |
112 | } | |
113 | } | |
114 | ||
0916b469 GJ |
115 | static int mips_cpu_intc_map(struct irq_domain *d, unsigned int irq, |
116 | irq_hw_number_t hw) | |
117 | { | |
118 | static struct irq_chip *chip; | |
119 | ||
120 | if (hw < 2 && cpu_has_mipsmt) { | |
121 | /* Software interrupts are used for MT/CMT IPI */ | |
122 | chip = &mips_mt_cpu_irq_controller; | |
123 | } else { | |
124 | chip = &mips_cpu_irq_controller; | |
125 | } | |
126 | ||
127 | irq_set_chip_and_handler(irq, chip, handle_percpu_irq); | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | static const struct irq_domain_ops mips_cpu_intc_irq_domain_ops = { | |
133 | .map = mips_cpu_intc_map, | |
134 | .xlate = irq_domain_xlate_onecell, | |
135 | }; | |
136 | ||
0f84c305 | 137 | static void __init __mips_cpu_irq_init(struct device_node *of_node) |
0916b469 GJ |
138 | { |
139 | struct irq_domain *domain; | |
140 | ||
141 | /* Mask interrupts. */ | |
142 | clear_c0_status(ST0_IM); | |
143 | clear_c0_cause(CAUSEF_IP); | |
144 | ||
145 | domain = irq_domain_add_legacy(of_node, 8, MIPS_CPU_IRQ_BASE, 0, | |
146 | &mips_cpu_intc_irq_domain_ops, NULL); | |
147 | if (!domain) | |
f7777dcc | 148 | panic("Failed to add irqdomain for MIPS CPU"); |
0f84c305 AB |
149 | } |
150 | ||
151 | void __init mips_cpu_irq_init(void) | |
152 | { | |
153 | __mips_cpu_irq_init(NULL); | |
154 | } | |
0916b469 | 155 | |
afe8dc25 AB |
156 | int __init mips_cpu_irq_of_init(struct device_node *of_node, |
157 | struct device_node *parent) | |
0f84c305 AB |
158 | { |
159 | __mips_cpu_irq_init(of_node); | |
0916b469 GJ |
160 | return 0; |
161 | } |