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d788bfa9 HC |
1 | #include <loongson.h> |
2 | #include <irq.h> | |
3 | #include <linux/interrupt.h> | |
4 | #include <linux/module.h> | |
5 | ||
6 | #include <asm/irq_cpu.h> | |
7 | #include <asm/i8259.h> | |
8 | #include <asm/mipsregs.h> | |
9 | ||
10 | unsigned int ht_irq[] = {1, 3, 4, 5, 6, 7, 8, 12, 14, 15}; | |
11 | ||
12 | static void ht_irqdispatch(void) | |
13 | { | |
14 | unsigned int i, irq; | |
15 | ||
16 | irq = LOONGSON_HT1_INT_VECTOR(0); | |
17 | LOONGSON_HT1_INT_VECTOR(0) = irq; /* Acknowledge the IRQs */ | |
18 | ||
19 | for (i = 0; i < ARRAY_SIZE(ht_irq); i++) { | |
20 | if (irq & (0x1 << ht_irq[i])) | |
21 | do_IRQ(ht_irq[i]); | |
22 | } | |
23 | } | |
24 | ||
25 | void mach_irq_dispatch(unsigned int pending) | |
26 | { | |
27 | if (pending & CAUSEF_IP7) | |
28 | do_IRQ(LOONGSON_TIMER_IRQ); | |
300459d5 HC |
29 | #if defined(CONFIG_SMP) |
30 | else if (pending & CAUSEF_IP6) | |
31 | loongson3_ipi_interrupt(NULL); | |
32 | #endif | |
d788bfa9 HC |
33 | else if (pending & CAUSEF_IP3) |
34 | ht_irqdispatch(); | |
35 | else if (pending & CAUSEF_IP2) | |
36 | do_IRQ(LOONGSON_UART_IRQ); | |
37 | else { | |
38 | pr_err("%s : spurious interrupt\n", __func__); | |
39 | spurious_interrupt(); | |
40 | } | |
41 | } | |
42 | ||
43 | static struct irqaction cascade_irqaction = { | |
44 | .handler = no_action, | |
45 | .name = "cascade", | |
46 | }; | |
47 | ||
48 | static inline void mask_loongson_irq(struct irq_data *d) | |
49 | { | |
50 | clear_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE)); | |
51 | irq_disable_hazard(); | |
300459d5 HC |
52 | |
53 | /* Workaround: UART IRQ may deliver to any core */ | |
54 | if (d->irq == LOONGSON_UART_IRQ) { | |
55 | int cpu = smp_processor_id(); | |
56 | ||
57 | LOONGSON_INT_ROUTER_INTENCLR = 1 << 10; | |
58 | LOONGSON_INT_ROUTER_LPC = 0x10 + (1<<cpu); | |
59 | } | |
d788bfa9 HC |
60 | } |
61 | ||
62 | static inline void unmask_loongson_irq(struct irq_data *d) | |
63 | { | |
300459d5 HC |
64 | /* Workaround: UART IRQ may deliver to any core */ |
65 | if (d->irq == LOONGSON_UART_IRQ) { | |
66 | int cpu = smp_processor_id(); | |
67 | ||
68 | LOONGSON_INT_ROUTER_INTENSET = 1 << 10; | |
69 | LOONGSON_INT_ROUTER_LPC = 0x10 + (1<<cpu); | |
70 | } | |
71 | ||
d788bfa9 HC |
72 | set_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE)); |
73 | irq_enable_hazard(); | |
74 | } | |
75 | ||
76 | /* For MIPS IRQs which shared by all cores */ | |
77 | static struct irq_chip loongson_irq_chip = { | |
78 | .name = "Loongson", | |
79 | .irq_ack = mask_loongson_irq, | |
80 | .irq_mask = mask_loongson_irq, | |
81 | .irq_mask_ack = mask_loongson_irq, | |
82 | .irq_unmask = unmask_loongson_irq, | |
83 | .irq_eoi = unmask_loongson_irq, | |
84 | }; | |
85 | ||
86 | void irq_router_init(void) | |
87 | { | |
88 | int i; | |
89 | ||
90 | /* route LPC int to cpu core0 int 0 */ | |
91 | LOONGSON_INT_ROUTER_LPC = LOONGSON_INT_CORE0_INT0; | |
92 | /* route HT1 int0 ~ int7 to cpu core0 INT1*/ | |
93 | for (i = 0; i < 8; i++) | |
94 | LOONGSON_INT_ROUTER_HT1(i) = LOONGSON_INT_CORE0_INT1; | |
95 | /* enable HT1 interrupt */ | |
96 | LOONGSON_HT1_INTN_EN(0) = 0xffffffff; | |
97 | /* enable router interrupt intenset */ | |
98 | LOONGSON_INT_ROUTER_INTENSET = | |
99 | LOONGSON_INT_ROUTER_INTEN | (0xffff << 16) | 0x1 << 10; | |
100 | } | |
101 | ||
102 | void __init mach_init_irq(void) | |
103 | { | |
104 | clear_c0_status(ST0_IM | ST0_BEV); | |
105 | ||
106 | irq_router_init(); | |
107 | mips_cpu_irq_init(); | |
108 | init_i8259_irqs(); | |
109 | irq_set_chip_and_handler(LOONGSON_UART_IRQ, | |
110 | &loongson_irq_chip, handle_level_irq); | |
111 | ||
112 | /* setup HT1 irq */ | |
113 | setup_irq(LOONGSON_HT1_IRQ, &cascade_irqaction); | |
114 | ||
115 | set_c0_status(STATUSF_IP2 | STATUSF_IP6); | |
116 | } | |
c4a987db HC |
117 | |
118 | #ifdef CONFIG_HOTPLUG_CPU | |
119 | ||
120 | void fixup_irqs(void) | |
121 | { | |
122 | irq_cpu_offline(); | |
123 | clear_c0_status(ST0_IM); | |
124 | } | |
125 | ||
126 | #endif |