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1 | /* |
2 | * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com> | |
3 | * | |
70342287 RB |
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 | |
ca585cf9 KC |
6 | * Free Software Foundation; either version 2 of the License, or (at your |
7 | * option) any later version. | |
8 | */ | |
9 | ||
10 | #include <linux/interrupt.h> | |
11 | #include <linux/irq.h> | |
12 | #include <asm/irq_cpu.h> | |
13 | ||
14 | #include <loongson1.h> | |
15 | #include <irq.h> | |
16 | ||
17 | #define LS1X_INTC_REG(n, x) \ | |
18 | ((void __iomem *)KSEG1ADDR(LS1X_INTC_BASE + (n * 0x18) + (x))) | |
19 | ||
20 | #define LS1X_INTC_INTISR(n) LS1X_INTC_REG(n, 0x0) | |
21 | #define LS1X_INTC_INTIEN(n) LS1X_INTC_REG(n, 0x4) | |
22 | #define LS1X_INTC_INTSET(n) LS1X_INTC_REG(n, 0x8) | |
23 | #define LS1X_INTC_INTCLR(n) LS1X_INTC_REG(n, 0xc) | |
24 | #define LS1X_INTC_INTPOL(n) LS1X_INTC_REG(n, 0x10) | |
25 | #define LS1X_INTC_INTEDGE(n) LS1X_INTC_REG(n, 0x14) | |
26 | ||
27 | static void ls1x_irq_ack(struct irq_data *d) | |
28 | { | |
29 | unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f; | |
30 | unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5; | |
31 | ||
32 | __raw_writel(__raw_readl(LS1X_INTC_INTCLR(n)) | |
33 | | (1 << bit), LS1X_INTC_INTCLR(n)); | |
34 | } | |
35 | ||
36 | static void ls1x_irq_mask(struct irq_data *d) | |
37 | { | |
38 | unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f; | |
39 | unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5; | |
40 | ||
41 | __raw_writel(__raw_readl(LS1X_INTC_INTIEN(n)) | |
42 | & ~(1 << bit), LS1X_INTC_INTIEN(n)); | |
43 | } | |
44 | ||
45 | static void ls1x_irq_mask_ack(struct irq_data *d) | |
46 | { | |
47 | unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f; | |
48 | unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5; | |
49 | ||
50 | __raw_writel(__raw_readl(LS1X_INTC_INTIEN(n)) | |
51 | & ~(1 << bit), LS1X_INTC_INTIEN(n)); | |
52 | __raw_writel(__raw_readl(LS1X_INTC_INTCLR(n)) | |
53 | | (1 << bit), LS1X_INTC_INTCLR(n)); | |
54 | } | |
55 | ||
56 | static void ls1x_irq_unmask(struct irq_data *d) | |
57 | { | |
58 | unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f; | |
59 | unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5; | |
60 | ||
61 | __raw_writel(__raw_readl(LS1X_INTC_INTIEN(n)) | |
62 | | (1 << bit), LS1X_INTC_INTIEN(n)); | |
63 | } | |
64 | ||
65 | static struct irq_chip ls1x_irq_chip = { | |
66 | .name = "LS1X-INTC", | |
67 | .irq_ack = ls1x_irq_ack, | |
68 | .irq_mask = ls1x_irq_mask, | |
69 | .irq_mask_ack = ls1x_irq_mask_ack, | |
70 | .irq_unmask = ls1x_irq_unmask, | |
71 | }; | |
72 | ||
73 | static void ls1x_irq_dispatch(int n) | |
74 | { | |
75 | u32 int_status, irq; | |
76 | ||
77 | /* Get pending sources, masked by current enables */ | |
78 | int_status = __raw_readl(LS1X_INTC_INTISR(n)) & | |
79 | __raw_readl(LS1X_INTC_INTIEN(n)); | |
80 | ||
81 | if (int_status) { | |
82 | irq = LS1X_IRQ(n, __ffs(int_status)); | |
83 | do_IRQ(irq); | |
84 | } | |
85 | } | |
86 | ||
87 | asmlinkage void plat_irq_dispatch(void) | |
88 | { | |
89 | unsigned int pending; | |
90 | ||
91 | pending = read_c0_cause() & read_c0_status() & ST0_IM; | |
92 | ||
93 | if (pending & CAUSEF_IP7) | |
94 | do_IRQ(TIMER_IRQ); | |
95 | else if (pending & CAUSEF_IP2) | |
96 | ls1x_irq_dispatch(0); /* INT0 */ | |
97 | else if (pending & CAUSEF_IP3) | |
98 | ls1x_irq_dispatch(1); /* INT1 */ | |
99 | else if (pending & CAUSEF_IP4) | |
100 | ls1x_irq_dispatch(2); /* INT2 */ | |
101 | else if (pending & CAUSEF_IP5) | |
102 | ls1x_irq_dispatch(3); /* INT3 */ | |
103 | else if (pending & CAUSEF_IP6) | |
104 | ls1x_irq_dispatch(4); /* INT4 */ | |
105 | else | |
106 | spurious_interrupt(); | |
107 | ||
108 | } | |
109 | ||
110 | struct irqaction cascade_irqaction = { | |
111 | .handler = no_action, | |
112 | .name = "cascade", | |
113 | .flags = IRQF_NO_THREAD, | |
114 | }; | |
115 | ||
116 | static void __init ls1x_irq_init(int base) | |
117 | { | |
118 | int n; | |
119 | ||
120 | /* Disable interrupts and clear pending, | |
121 | * setup all IRQs as high level triggered | |
122 | */ | |
123 | for (n = 0; n < 4; n++) { | |
124 | __raw_writel(0x0, LS1X_INTC_INTIEN(n)); | |
125 | __raw_writel(0xffffffff, LS1X_INTC_INTCLR(n)); | |
126 | __raw_writel(0xffffffff, LS1X_INTC_INTPOL(n)); | |
127 | /* set DMA0, DMA1 and DMA2 to edge trigger */ | |
128 | __raw_writel(n ? 0x0 : 0xe000, LS1X_INTC_INTEDGE(n)); | |
129 | } | |
130 | ||
131 | ||
132 | for (n = base; n < LS1X_IRQS; n++) { | |
133 | irq_set_chip_and_handler(n, &ls1x_irq_chip, | |
134 | handle_level_irq); | |
135 | } | |
136 | ||
137 | setup_irq(INT0_IRQ, &cascade_irqaction); | |
138 | setup_irq(INT1_IRQ, &cascade_irqaction); | |
139 | setup_irq(INT2_IRQ, &cascade_irqaction); | |
140 | setup_irq(INT3_IRQ, &cascade_irqaction); | |
141 | } | |
142 | ||
143 | void __init arch_init_irq(void) | |
144 | { | |
145 | mips_cpu_irq_init(); | |
146 | ls1x_irq_init(LS1X_IRQ_BASE); | |
147 | } |