root / hw / syborg_interrupt.c @ 15a1956a
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1 | 4af39611 | Paul Brook | /*
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2 | 4af39611 | Paul Brook | * Syborg interrupt controller.
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3 | 4af39611 | Paul Brook | *
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4 | 4af39611 | Paul Brook | * Copyright (c) 2008 CodeSourcery
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5 | 4af39611 | Paul Brook | *
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6 | 4af39611 | Paul Brook | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | 4af39611 | Paul Brook | * of this software and associated documentation files (the "Software"), to deal
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8 | 4af39611 | Paul Brook | * in the Software without restriction, including without limitation the rights
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9 | 4af39611 | Paul Brook | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | 4af39611 | Paul Brook | * copies of the Software, and to permit persons to whom the Software is
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11 | 4af39611 | Paul Brook | * furnished to do so, subject to the following conditions:
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12 | 4af39611 | Paul Brook | *
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13 | 4af39611 | Paul Brook | * The above copyright notice and this permission notice shall be included in
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14 | 4af39611 | Paul Brook | * all copies or substantial portions of the Software.
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15 | 4af39611 | Paul Brook | *
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16 | 4af39611 | Paul Brook | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | 4af39611 | Paul Brook | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | 4af39611 | Paul Brook | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | 4af39611 | Paul Brook | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | 4af39611 | Paul Brook | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | 4af39611 | Paul Brook | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | 4af39611 | Paul Brook | * THE SOFTWARE.
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23 | 4af39611 | Paul Brook | */
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24 | 4af39611 | Paul Brook | |
25 | 4af39611 | Paul Brook | #include "sysbus.h" |
26 | 4af39611 | Paul Brook | #include "syborg.h" |
27 | 4af39611 | Paul Brook | |
28 | 4af39611 | Paul Brook | //#define DEBUG_SYBORG_INT
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29 | 4af39611 | Paul Brook | |
30 | 4af39611 | Paul Brook | #ifdef DEBUG_SYBORG_INT
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31 | 4af39611 | Paul Brook | #define DPRINTF(fmt, ...) \
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32 | 4af39611 | Paul Brook | do { printf("syborg_int: " fmt , ## __VA_ARGS__); } while (0) |
33 | 4af39611 | Paul Brook | #define BADF(fmt, ...) \
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34 | 4af39611 | Paul Brook | do { fprintf(stderr, "syborg_int: error: " fmt , ## __VA_ARGS__); \ |
35 | 4af39611 | Paul Brook | exit(1);} while (0) |
36 | 4af39611 | Paul Brook | #else
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37 | 4af39611 | Paul Brook | #define DPRINTF(fmt, ...) do {} while(0) |
38 | 4af39611 | Paul Brook | #define BADF(fmt, ...) \
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39 | 4af39611 | Paul Brook | do { fprintf(stderr, "syborg_int: error: " fmt , ## __VA_ARGS__);} while (0) |
40 | 4af39611 | Paul Brook | #endif
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41 | 4af39611 | Paul Brook | enum {
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42 | 4af39611 | Paul Brook | INT_ID = 0,
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43 | 4af39611 | Paul Brook | INT_STATUS = 1, /* number of pending interrupts */ |
44 | 4af39611 | Paul Brook | INT_CURRENT = 2, /* next interrupt to be serviced */ |
45 | 4af39611 | Paul Brook | INT_DISABLE_ALL = 3,
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46 | 4af39611 | Paul Brook | INT_DISABLE = 4,
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47 | 4af39611 | Paul Brook | INT_ENABLE = 5,
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48 | 4af39611 | Paul Brook | INT_TOTAL = 6
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49 | 4af39611 | Paul Brook | }; |
50 | 4af39611 | Paul Brook | |
51 | 4af39611 | Paul Brook | typedef struct { |
52 | 4af39611 | Paul Brook | unsigned level:1; |
53 | 4af39611 | Paul Brook | unsigned enabled:1; |
54 | 4af39611 | Paul Brook | } syborg_int_flags; |
55 | 4af39611 | Paul Brook | |
56 | 4af39611 | Paul Brook | typedef struct { |
57 | 4af39611 | Paul Brook | SysBusDevice busdev; |
58 | 4af39611 | Paul Brook | int pending_count;
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59 | 4af39611 | Paul Brook | int num_irqs;
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60 | 4af39611 | Paul Brook | syborg_int_flags *flags; |
61 | 4af39611 | Paul Brook | qemu_irq parent_irq; |
62 | 4af39611 | Paul Brook | } SyborgIntState; |
63 | 4af39611 | Paul Brook | |
64 | 4af39611 | Paul Brook | static void syborg_int_update(SyborgIntState *s) |
65 | 4af39611 | Paul Brook | { |
66 | 4af39611 | Paul Brook | DPRINTF("pending %d\n", s->pending_count);
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67 | 4af39611 | Paul Brook | qemu_set_irq(s->parent_irq, s->pending_count > 0);
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68 | 4af39611 | Paul Brook | } |
69 | 4af39611 | Paul Brook | |
70 | 4af39611 | Paul Brook | static void syborg_int_set_irq(void *opaque, int irq, int level) |
71 | 4af39611 | Paul Brook | { |
72 | 4af39611 | Paul Brook | SyborgIntState *s = (SyborgIntState *)opaque; |
73 | 4af39611 | Paul Brook | |
74 | 4af39611 | Paul Brook | if (s->flags[irq].level == level)
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75 | 4af39611 | Paul Brook | return;
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76 | 4af39611 | Paul Brook | |
77 | 4af39611 | Paul Brook | s->flags[irq].level = level; |
78 | 4af39611 | Paul Brook | if (s->flags[irq].enabled) {
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79 | 4af39611 | Paul Brook | if (level)
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80 | 4af39611 | Paul Brook | s->pending_count++; |
81 | 4af39611 | Paul Brook | else
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82 | 4af39611 | Paul Brook | s->pending_count--; |
83 | 4af39611 | Paul Brook | syborg_int_update(s); |
84 | 4af39611 | Paul Brook | } |
85 | 4af39611 | Paul Brook | } |
86 | 4af39611 | Paul Brook | |
87 | 4af39611 | Paul Brook | static uint32_t syborg_int_read(void *opaque, target_phys_addr_t offset) |
88 | 4af39611 | Paul Brook | { |
89 | 4af39611 | Paul Brook | SyborgIntState *s = (SyborgIntState *)opaque; |
90 | 4af39611 | Paul Brook | int i;
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91 | 4af39611 | Paul Brook | |
92 | 4af39611 | Paul Brook | offset &= 0xfff;
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93 | 4af39611 | Paul Brook | switch (offset >> 2) { |
94 | 4af39611 | Paul Brook | case INT_ID:
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95 | 4af39611 | Paul Brook | return SYBORG_ID_INT;
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96 | 4af39611 | Paul Brook | case INT_STATUS:
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97 | 4af39611 | Paul Brook | DPRINTF("read status=%d\n", s->pending_count);
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98 | 4af39611 | Paul Brook | return s->pending_count;
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99 | 4af39611 | Paul Brook | |
100 | 4af39611 | Paul Brook | case INT_CURRENT:
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101 | 4af39611 | Paul Brook | for (i = 0; i < s->num_irqs; i++) { |
102 | 4af39611 | Paul Brook | if (s->flags[i].level & s->flags[i].enabled) {
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103 | 4af39611 | Paul Brook | DPRINTF("read current=%d\n", i);
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104 | 4af39611 | Paul Brook | return i;
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105 | 4af39611 | Paul Brook | } |
106 | 4af39611 | Paul Brook | } |
107 | 4af39611 | Paul Brook | DPRINTF("read current=none\n");
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108 | 4af39611 | Paul Brook | return 0xffffffffu; |
109 | 4af39611 | Paul Brook | |
110 | 4af39611 | Paul Brook | default:
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111 | 4af39611 | Paul Brook | cpu_abort(cpu_single_env, "syborg_int_read: Bad offset %x\n",
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112 | 4af39611 | Paul Brook | (int)offset);
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113 | 4af39611 | Paul Brook | return 0; |
114 | 4af39611 | Paul Brook | } |
115 | 4af39611 | Paul Brook | } |
116 | 4af39611 | Paul Brook | |
117 | 4af39611 | Paul Brook | static void syborg_int_write(void *opaque, target_phys_addr_t offset, uint32_t value) |
118 | 4af39611 | Paul Brook | { |
119 | 4af39611 | Paul Brook | SyborgIntState *s = (SyborgIntState *)opaque; |
120 | 4af39611 | Paul Brook | int i;
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121 | 4af39611 | Paul Brook | offset &= 0xfff;
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122 | 4af39611 | Paul Brook | |
123 | 4af39611 | Paul Brook | DPRINTF("syborg_int_write offset=%d val=%d\n", (int)offset, (int)value); |
124 | 4af39611 | Paul Brook | switch (offset >> 2) { |
125 | 4af39611 | Paul Brook | case INT_DISABLE_ALL:
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126 | 4af39611 | Paul Brook | s->pending_count = 0;
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127 | 4af39611 | Paul Brook | for (i = 0; i < s->num_irqs; i++) |
128 | 4af39611 | Paul Brook | s->flags[i].enabled = 0;
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129 | 4af39611 | Paul Brook | break;
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130 | 4af39611 | Paul Brook | |
131 | 4af39611 | Paul Brook | case INT_DISABLE:
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132 | 4af39611 | Paul Brook | if (value >= s->num_irqs)
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133 | 4af39611 | Paul Brook | break;
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134 | 4af39611 | Paul Brook | if (s->flags[value].enabled) {
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135 | 4af39611 | Paul Brook | if (s->flags[value].enabled)
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136 | 4af39611 | Paul Brook | s->pending_count--; |
137 | 4af39611 | Paul Brook | s->flags[value].enabled = 0;
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138 | 4af39611 | Paul Brook | } |
139 | 4af39611 | Paul Brook | break;
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140 | 4af39611 | Paul Brook | |
141 | 4af39611 | Paul Brook | case INT_ENABLE:
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142 | 4af39611 | Paul Brook | if (value >= s->num_irqs)
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143 | 4af39611 | Paul Brook | break;
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144 | 4af39611 | Paul Brook | if (!(s->flags[value].enabled)) {
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145 | 4af39611 | Paul Brook | if(s->flags[value].level)
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146 | 4af39611 | Paul Brook | s->pending_count++; |
147 | 4af39611 | Paul Brook | s->flags[value].enabled = 1;
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148 | 4af39611 | Paul Brook | } |
149 | 4af39611 | Paul Brook | break;
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150 | 4af39611 | Paul Brook | |
151 | 4af39611 | Paul Brook | default:
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152 | 4af39611 | Paul Brook | cpu_abort(cpu_single_env, "syborg_int_write: Bad offset %x\n",
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153 | 4af39611 | Paul Brook | (int)offset);
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154 | 4af39611 | Paul Brook | return;
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155 | 4af39611 | Paul Brook | } |
156 | 4af39611 | Paul Brook | syborg_int_update(s); |
157 | 4af39611 | Paul Brook | } |
158 | 4af39611 | Paul Brook | |
159 | 4af39611 | Paul Brook | static CPUReadMemoryFunc *syborg_int_readfn[] = {
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160 | 4af39611 | Paul Brook | syborg_int_read, |
161 | 4af39611 | Paul Brook | syborg_int_read, |
162 | 4af39611 | Paul Brook | syborg_int_read |
163 | 4af39611 | Paul Brook | }; |
164 | 4af39611 | Paul Brook | |
165 | 4af39611 | Paul Brook | static CPUWriteMemoryFunc *syborg_int_writefn[] = {
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166 | 4af39611 | Paul Brook | syborg_int_write, |
167 | 4af39611 | Paul Brook | syborg_int_write, |
168 | 4af39611 | Paul Brook | syborg_int_write |
169 | 4af39611 | Paul Brook | }; |
170 | 4af39611 | Paul Brook | |
171 | 4af39611 | Paul Brook | static void syborg_int_save(QEMUFile *f, void *opaque) |
172 | 4af39611 | Paul Brook | { |
173 | 4af39611 | Paul Brook | SyborgIntState *s = (SyborgIntState *)opaque; |
174 | 4af39611 | Paul Brook | int i;
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175 | 4af39611 | Paul Brook | |
176 | 4af39611 | Paul Brook | qemu_put_be32(f, s->num_irqs); |
177 | 4af39611 | Paul Brook | qemu_put_be32(f, s->pending_count); |
178 | 4af39611 | Paul Brook | for (i = 0; i < s->num_irqs; i++) { |
179 | 4af39611 | Paul Brook | qemu_put_be32(f, s->flags[i].enabled |
180 | 4af39611 | Paul Brook | | ((unsigned)s->flags[i].level << 1)); |
181 | 4af39611 | Paul Brook | } |
182 | 4af39611 | Paul Brook | } |
183 | 4af39611 | Paul Brook | |
184 | 4af39611 | Paul Brook | static int syborg_int_load(QEMUFile *f, void *opaque, int version_id) |
185 | 4af39611 | Paul Brook | { |
186 | 4af39611 | Paul Brook | SyborgIntState *s = (SyborgIntState *)opaque; |
187 | 4af39611 | Paul Brook | uint32_t val; |
188 | 4af39611 | Paul Brook | int i;
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189 | 4af39611 | Paul Brook | |
190 | 4af39611 | Paul Brook | if (version_id != 1) |
191 | 4af39611 | Paul Brook | return -EINVAL;
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192 | 4af39611 | Paul Brook | |
193 | 4af39611 | Paul Brook | val = qemu_get_be32(f); |
194 | 4af39611 | Paul Brook | if (val != s->num_irqs)
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195 | 4af39611 | Paul Brook | return -EINVAL;
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196 | 4af39611 | Paul Brook | s->pending_count = qemu_get_be32(f); |
197 | 4af39611 | Paul Brook | for (i = 0; i < s->num_irqs; i++) { |
198 | 4af39611 | Paul Brook | val = qemu_get_be32(f); |
199 | 4af39611 | Paul Brook | s->flags[i].enabled = val & 1;
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200 | 4af39611 | Paul Brook | s->flags[i].level = (val >> 1) & 1; |
201 | 4af39611 | Paul Brook | } |
202 | 4af39611 | Paul Brook | return 0; |
203 | 4af39611 | Paul Brook | } |
204 | 4af39611 | Paul Brook | |
205 | 4af39611 | Paul Brook | static void syborg_int_init(SysBusDevice *dev) |
206 | 4af39611 | Paul Brook | { |
207 | 4af39611 | Paul Brook | SyborgIntState *s = FROM_SYSBUS(SyborgIntState, dev); |
208 | 4af39611 | Paul Brook | int iomemtype;
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209 | 4af39611 | Paul Brook | |
210 | 4af39611 | Paul Brook | sysbus_init_irq(dev, &s->parent_irq); |
211 | 4af39611 | Paul Brook | s->num_irqs = qdev_get_prop_int(&dev->qdev, "num-interrupts", 64); |
212 | 067a3ddc | Paul Brook | qdev_init_gpio_in(&dev->qdev, syborg_int_set_irq, s->num_irqs); |
213 | 1eed09cb | Avi Kivity | iomemtype = cpu_register_io_memory(syborg_int_readfn, |
214 | 4af39611 | Paul Brook | syborg_int_writefn, s); |
215 | 4af39611 | Paul Brook | sysbus_init_mmio(dev, 0x1000, iomemtype);
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216 | 4af39611 | Paul Brook | s->flags = qemu_mallocz(s->num_irqs * sizeof(syborg_int_flags));
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217 | 4af39611 | Paul Brook | |
218 | 4af39611 | Paul Brook | register_savevm("syborg_int", -1, 1, syborg_int_save, syborg_int_load, s); |
219 | 4af39611 | Paul Brook | } |
220 | 4af39611 | Paul Brook | |
221 | 4af39611 | Paul Brook | static void syborg_interrupt_register_devices(void) |
222 | 4af39611 | Paul Brook | { |
223 | 4af39611 | Paul Brook | sysbus_register_dev("syborg,interrupt", sizeof(SyborgIntState), |
224 | 4af39611 | Paul Brook | syborg_int_init); |
225 | 4af39611 | Paul Brook | } |
226 | 4af39611 | Paul Brook | |
227 | 4af39611 | Paul Brook | device_init(syborg_interrupt_register_devices) |