root / hw / puv3_intc.c @ 7830cf78
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1 | 5c8556a6 | Guan Xuetao | /*
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2 | 5c8556a6 | Guan Xuetao | * INTC device simulation in PKUnity SoC
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3 | 5c8556a6 | Guan Xuetao | *
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4 | 5c8556a6 | Guan Xuetao | * Copyright (C) 2010-2012 Guan Xuetao
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5 | 5c8556a6 | Guan Xuetao | *
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6 | 5c8556a6 | Guan Xuetao | * This program is free software; you can redistribute it and/or modify
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7 | 5c8556a6 | Guan Xuetao | * it under the terms of the GNU General Public License version 2 as
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8 | 5c8556a6 | Guan Xuetao | * published by the Free Software Foundation, or any later version.
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9 | 5c8556a6 | Guan Xuetao | * See the COPYING file in the top-level directory.
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10 | 5c8556a6 | Guan Xuetao | */
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11 | 5c8556a6 | Guan Xuetao | #include "sysbus.h" |
12 | 5c8556a6 | Guan Xuetao | |
13 | 5c8556a6 | Guan Xuetao | #undef DEBUG_PUV3
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14 | 5c8556a6 | Guan Xuetao | #include "puv3.h" |
15 | 5c8556a6 | Guan Xuetao | |
16 | 5c8556a6 | Guan Xuetao | typedef struct { |
17 | 5c8556a6 | Guan Xuetao | SysBusDevice busdev; |
18 | 5c8556a6 | Guan Xuetao | MemoryRegion iomem; |
19 | 5c8556a6 | Guan Xuetao | qemu_irq parent_irq; |
20 | 5c8556a6 | Guan Xuetao | |
21 | 5c8556a6 | Guan Xuetao | uint32_t reg_ICMR; |
22 | 5c8556a6 | Guan Xuetao | uint32_t reg_ICPR; |
23 | 5c8556a6 | Guan Xuetao | } PUV3INTCState; |
24 | 5c8556a6 | Guan Xuetao | |
25 | 5c8556a6 | Guan Xuetao | /* Update interrupt status after enabled or pending bits have been changed. */
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26 | 5c8556a6 | Guan Xuetao | static void puv3_intc_update(PUV3INTCState *s) |
27 | 5c8556a6 | Guan Xuetao | { |
28 | 5c8556a6 | Guan Xuetao | if (s->reg_ICMR & s->reg_ICPR) {
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29 | 5c8556a6 | Guan Xuetao | qemu_irq_raise(s->parent_irq); |
30 | 5c8556a6 | Guan Xuetao | } else {
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31 | 5c8556a6 | Guan Xuetao | qemu_irq_lower(s->parent_irq); |
32 | 5c8556a6 | Guan Xuetao | } |
33 | 5c8556a6 | Guan Xuetao | } |
34 | 5c8556a6 | Guan Xuetao | |
35 | 5c8556a6 | Guan Xuetao | /* Process a change in an external INTC input. */
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36 | 5c8556a6 | Guan Xuetao | static void puv3_intc_handler(void *opaque, int irq, int level) |
37 | 5c8556a6 | Guan Xuetao | { |
38 | 5c8556a6 | Guan Xuetao | PUV3INTCState *s = opaque; |
39 | 5c8556a6 | Guan Xuetao | |
40 | 5c8556a6 | Guan Xuetao | DPRINTF("irq 0x%x, level 0x%x\n", irq, level);
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41 | 5c8556a6 | Guan Xuetao | if (level) {
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42 | 5c8556a6 | Guan Xuetao | s->reg_ICPR |= (1 << irq);
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43 | 5c8556a6 | Guan Xuetao | } else {
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44 | 5c8556a6 | Guan Xuetao | s->reg_ICPR &= ~(1 << irq);
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45 | 5c8556a6 | Guan Xuetao | } |
46 | 5c8556a6 | Guan Xuetao | puv3_intc_update(s); |
47 | 5c8556a6 | Guan Xuetao | } |
48 | 5c8556a6 | Guan Xuetao | |
49 | a8170e5e | Avi Kivity | static uint64_t puv3_intc_read(void *opaque, hwaddr offset, |
50 | 5c8556a6 | Guan Xuetao | unsigned size)
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51 | 5c8556a6 | Guan Xuetao | { |
52 | 5c8556a6 | Guan Xuetao | PUV3INTCState *s = opaque; |
53 | 5c8556a6 | Guan Xuetao | uint32_t ret = 0;
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54 | 5c8556a6 | Guan Xuetao | |
55 | 5c8556a6 | Guan Xuetao | switch (offset) {
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56 | 5c8556a6 | Guan Xuetao | case 0x04: /* INTC_ICMR */ |
57 | 5c8556a6 | Guan Xuetao | ret = s->reg_ICMR; |
58 | 5c8556a6 | Guan Xuetao | break;
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59 | 5c8556a6 | Guan Xuetao | case 0x0c: /* INTC_ICIP */ |
60 | 5c8556a6 | Guan Xuetao | ret = s->reg_ICPR; /* the same value with ICPR */
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61 | 5c8556a6 | Guan Xuetao | break;
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62 | 5c8556a6 | Guan Xuetao | default:
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63 | 5c8556a6 | Guan Xuetao | DPRINTF("Bad offset %x\n", (int)offset); |
64 | 5c8556a6 | Guan Xuetao | } |
65 | 5c8556a6 | Guan Xuetao | DPRINTF("offset 0x%x, value 0x%x\n", offset, ret);
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66 | 5c8556a6 | Guan Xuetao | return ret;
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67 | 5c8556a6 | Guan Xuetao | } |
68 | 5c8556a6 | Guan Xuetao | |
69 | a8170e5e | Avi Kivity | static void puv3_intc_write(void *opaque, hwaddr offset, |
70 | 5c8556a6 | Guan Xuetao | uint64_t value, unsigned size)
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71 | 5c8556a6 | Guan Xuetao | { |
72 | 5c8556a6 | Guan Xuetao | PUV3INTCState *s = opaque; |
73 | 5c8556a6 | Guan Xuetao | |
74 | 5c8556a6 | Guan Xuetao | DPRINTF("offset 0x%x, value 0x%x\n", offset, value);
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75 | 5c8556a6 | Guan Xuetao | switch (offset) {
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76 | 5c8556a6 | Guan Xuetao | case 0x00: /* INTC_ICLR */ |
77 | 5c8556a6 | Guan Xuetao | case 0x14: /* INTC_ICCR */ |
78 | 5c8556a6 | Guan Xuetao | break;
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79 | 5c8556a6 | Guan Xuetao | case 0x04: /* INTC_ICMR */ |
80 | 5c8556a6 | Guan Xuetao | s->reg_ICMR = value; |
81 | 5c8556a6 | Guan Xuetao | break;
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82 | 5c8556a6 | Guan Xuetao | default:
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83 | 5c8556a6 | Guan Xuetao | DPRINTF("Bad offset 0x%x\n", (int)offset); |
84 | 5c8556a6 | Guan Xuetao | return;
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85 | 5c8556a6 | Guan Xuetao | } |
86 | 5c8556a6 | Guan Xuetao | puv3_intc_update(s); |
87 | 5c8556a6 | Guan Xuetao | } |
88 | 5c8556a6 | Guan Xuetao | |
89 | 5c8556a6 | Guan Xuetao | static const MemoryRegionOps puv3_intc_ops = { |
90 | 5c8556a6 | Guan Xuetao | .read = puv3_intc_read, |
91 | 5c8556a6 | Guan Xuetao | .write = puv3_intc_write, |
92 | 5c8556a6 | Guan Xuetao | .impl = { |
93 | 5c8556a6 | Guan Xuetao | .min_access_size = 4,
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94 | 5c8556a6 | Guan Xuetao | .max_access_size = 4,
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95 | 5c8556a6 | Guan Xuetao | }, |
96 | 5c8556a6 | Guan Xuetao | .endianness = DEVICE_NATIVE_ENDIAN, |
97 | 5c8556a6 | Guan Xuetao | }; |
98 | 5c8556a6 | Guan Xuetao | |
99 | 5c8556a6 | Guan Xuetao | static int puv3_intc_init(SysBusDevice *dev) |
100 | 5c8556a6 | Guan Xuetao | { |
101 | 5c8556a6 | Guan Xuetao | PUV3INTCState *s = FROM_SYSBUS(PUV3INTCState, dev); |
102 | 5c8556a6 | Guan Xuetao | |
103 | 5c8556a6 | Guan Xuetao | qdev_init_gpio_in(&s->busdev.qdev, puv3_intc_handler, PUV3_IRQS_NR); |
104 | 5c8556a6 | Guan Xuetao | sysbus_init_irq(&s->busdev, &s->parent_irq); |
105 | 5c8556a6 | Guan Xuetao | |
106 | 5c8556a6 | Guan Xuetao | s->reg_ICMR = 0;
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107 | 5c8556a6 | Guan Xuetao | s->reg_ICPR = 0;
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108 | 5c8556a6 | Guan Xuetao | |
109 | 5c8556a6 | Guan Xuetao | memory_region_init_io(&s->iomem, &puv3_intc_ops, s, "puv3_intc",
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110 | 5c8556a6 | Guan Xuetao | PUV3_REGS_OFFSET); |
111 | 5c8556a6 | Guan Xuetao | sysbus_init_mmio(dev, &s->iomem); |
112 | 5c8556a6 | Guan Xuetao | |
113 | 5c8556a6 | Guan Xuetao | return 0; |
114 | 5c8556a6 | Guan Xuetao | } |
115 | 5c8556a6 | Guan Xuetao | |
116 | 5c8556a6 | Guan Xuetao | static void puv3_intc_class_init(ObjectClass *klass, void *data) |
117 | 5c8556a6 | Guan Xuetao | { |
118 | 5c8556a6 | Guan Xuetao | SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass); |
119 | 5c8556a6 | Guan Xuetao | |
120 | 5c8556a6 | Guan Xuetao | sdc->init = puv3_intc_init; |
121 | 5c8556a6 | Guan Xuetao | } |
122 | 5c8556a6 | Guan Xuetao | |
123 | 5c8556a6 | Guan Xuetao | static const TypeInfo puv3_intc_info = { |
124 | 5c8556a6 | Guan Xuetao | .name = "puv3_intc",
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125 | 5c8556a6 | Guan Xuetao | .parent = TYPE_SYS_BUS_DEVICE, |
126 | 5c8556a6 | Guan Xuetao | .instance_size = sizeof(PUV3INTCState),
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127 | 5c8556a6 | Guan Xuetao | .class_init = puv3_intc_class_init, |
128 | 5c8556a6 | Guan Xuetao | }; |
129 | 5c8556a6 | Guan Xuetao | |
130 | 5c8556a6 | Guan Xuetao | static void puv3_intc_register_type(void) |
131 | 5c8556a6 | Guan Xuetao | { |
132 | 5c8556a6 | Guan Xuetao | type_register_static(&puv3_intc_info); |
133 | 5c8556a6 | Guan Xuetao | } |
134 | 5c8556a6 | Guan Xuetao | |
135 | 5c8556a6 | Guan Xuetao | type_init(puv3_intc_register_type) |