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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> |
1da177e4 LT |
35 | |
36 | #include <asm/irq_cpu.h> | |
37 | #include <asm/mipsregs.h> | |
d03d0a57 | 38 | #include <asm/mipsmtregs.h> |
f64e55dc | 39 | #include <asm/setup.h> |
1da177e4 | 40 | |
a93951c4 | 41 | static inline void unmask_mips_irq(struct irq_data *d) |
1da177e4 | 42 | { |
a93951c4 | 43 | set_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE)); |
569f75bd | 44 | irq_enable_hazard(); |
1da177e4 LT |
45 | } |
46 | ||
a93951c4 | 47 | static inline void mask_mips_irq(struct irq_data *d) |
1da177e4 | 48 | { |
a93951c4 | 49 | clear_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE)); |
569f75bd | 50 | irq_disable_hazard(); |
1da177e4 LT |
51 | } |
52 | ||
94dee171 | 53 | static struct irq_chip mips_cpu_irq_controller = { |
70d21cde | 54 | .name = "MIPS", |
a93951c4 TG |
55 | .irq_ack = mask_mips_irq, |
56 | .irq_mask = mask_mips_irq, | |
57 | .irq_mask_ack = mask_mips_irq, | |
58 | .irq_unmask = unmask_mips_irq, | |
59 | .irq_eoi = unmask_mips_irq, | |
1da177e4 LT |
60 | }; |
61 | ||
d03d0a57 RB |
62 | /* |
63 | * Basically the same as above but taking care of all the MT stuff | |
64 | */ | |
65 | ||
a93951c4 | 66 | static unsigned int mips_mt_cpu_irq_startup(struct irq_data *d) |
d03d0a57 RB |
67 | { |
68 | unsigned int vpflags = dvpe(); | |
69 | ||
a93951c4 | 70 | clear_c0_cause(0x100 << (d->irq - MIPS_CPU_IRQ_BASE)); |
d03d0a57 | 71 | evpe(vpflags); |
a93951c4 | 72 | unmask_mips_irq(d); |
d03d0a57 RB |
73 | return 0; |
74 | } | |
75 | ||
d03d0a57 RB |
76 | /* |
77 | * While we ack the interrupt interrupts are disabled and thus we don't need | |
78 | * to deal with concurrency issues. Same for mips_cpu_irq_end. | |
79 | */ | |
a93951c4 | 80 | static void mips_mt_cpu_irq_ack(struct irq_data *d) |
d03d0a57 RB |
81 | { |
82 | unsigned int vpflags = dvpe(); | |
a93951c4 | 83 | clear_c0_cause(0x100 << (d->irq - MIPS_CPU_IRQ_BASE)); |
d03d0a57 | 84 | evpe(vpflags); |
a93951c4 | 85 | mask_mips_irq(d); |
d03d0a57 RB |
86 | } |
87 | ||
94dee171 | 88 | static struct irq_chip mips_mt_cpu_irq_controller = { |
70d21cde | 89 | .name = "MIPS", |
a93951c4 TG |
90 | .irq_startup = mips_mt_cpu_irq_startup, |
91 | .irq_ack = mips_mt_cpu_irq_ack, | |
92 | .irq_mask = mask_mips_irq, | |
93 | .irq_mask_ack = mips_mt_cpu_irq_ack, | |
94 | .irq_unmask = unmask_mips_irq, | |
95 | .irq_eoi = unmask_mips_irq, | |
d03d0a57 | 96 | }; |
1da177e4 | 97 | |
85f7cdac AB |
98 | asmlinkage void __weak plat_irq_dispatch(void) |
99 | { | |
100 | unsigned long pending = read_c0_cause() & read_c0_status() & ST0_IM; | |
101 | int irq; | |
102 | ||
103 | if (!pending) { | |
104 | spurious_interrupt(); | |
105 | return; | |
106 | } | |
107 | ||
108 | pending >>= CAUSEB_IP; | |
109 | while (pending) { | |
110 | irq = fls(pending) - 1; | |
111 | do_IRQ(MIPS_CPU_IRQ_BASE + irq); | |
112 | pending &= ~BIT(irq); | |
113 | } | |
114 | } | |
115 | ||
0916b469 GJ |
116 | static int mips_cpu_intc_map(struct irq_domain *d, unsigned int irq, |
117 | irq_hw_number_t hw) | |
118 | { | |
119 | static struct irq_chip *chip; | |
120 | ||
121 | if (hw < 2 && cpu_has_mipsmt) { | |
122 | /* Software interrupts are used for MT/CMT IPI */ | |
123 | chip = &mips_mt_cpu_irq_controller; | |
124 | } else { | |
125 | chip = &mips_cpu_irq_controller; | |
126 | } | |
127 | ||
f64e55dc AB |
128 | if (cpu_has_vint) |
129 | set_vi_handler(hw, plat_irq_dispatch); | |
130 | ||
0916b469 GJ |
131 | irq_set_chip_and_handler(irq, chip, handle_percpu_irq); |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | static const struct irq_domain_ops mips_cpu_intc_irq_domain_ops = { | |
137 | .map = mips_cpu_intc_map, | |
138 | .xlate = irq_domain_xlate_onecell, | |
139 | }; | |
140 | ||
0f84c305 | 141 | static void __init __mips_cpu_irq_init(struct device_node *of_node) |
0916b469 GJ |
142 | { |
143 | struct irq_domain *domain; | |
144 | ||
145 | /* Mask interrupts. */ | |
146 | clear_c0_status(ST0_IM); | |
147 | clear_c0_cause(CAUSEF_IP); | |
148 | ||
149 | domain = irq_domain_add_legacy(of_node, 8, MIPS_CPU_IRQ_BASE, 0, | |
150 | &mips_cpu_intc_irq_domain_ops, NULL); | |
151 | if (!domain) | |
f7777dcc | 152 | panic("Failed to add irqdomain for MIPS CPU"); |
0f84c305 AB |
153 | } |
154 | ||
155 | void __init mips_cpu_irq_init(void) | |
156 | { | |
157 | __mips_cpu_irq_init(NULL); | |
158 | } | |
0916b469 | 159 | |
afe8dc25 AB |
160 | int __init mips_cpu_irq_of_init(struct device_node *of_node, |
161 | struct device_node *parent) | |
0f84c305 AB |
162 | { |
163 | __mips_cpu_irq_init(of_node); | |
0916b469 GJ |
164 | return 0; |
165 | } |