root / hw / syborg_timer.c @ 3e35ba93
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1 | 4af39611 | Paul Brook | /*
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2 | 4af39611 | Paul Brook | * Syborg Interval Timer.
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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 "qemu-timer.h" |
27 | 4af39611 | Paul Brook | #include "syborg.h" |
28 | 4af39611 | Paul Brook | |
29 | 4af39611 | Paul Brook | //#define DEBUG_SYBORG_TIMER
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30 | 4af39611 | Paul Brook | |
31 | 4af39611 | Paul Brook | #ifdef DEBUG_SYBORG_TIMER
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32 | 4af39611 | Paul Brook | #define DPRINTF(fmt, ...) \
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33 | 4af39611 | Paul Brook | do { printf("syborg_timer: " fmt , ##args); } while (0) |
34 | 4af39611 | Paul Brook | #define BADF(fmt, ...) \
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35 | 4af39611 | Paul Brook | do { fprintf(stderr, "syborg_timer: error: " fmt , ## __VA_ARGS__); \ |
36 | 4af39611 | Paul Brook | exit(1);} while (0) |
37 | 4af39611 | Paul Brook | #else
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38 | 4af39611 | Paul Brook | #define DPRINTF(fmt, ...) do {} while(0) |
39 | 4af39611 | Paul Brook | #define BADF(fmt, ...) \
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40 | 4af39611 | Paul Brook | do { fprintf(stderr, "syborg_timer: error: " fmt , ## __VA_ARGS__);} while (0) |
41 | 4af39611 | Paul Brook | #endif
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42 | 4af39611 | Paul Brook | |
43 | 4af39611 | Paul Brook | enum {
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44 | 4af39611 | Paul Brook | TIMER_ID = 0,
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45 | 4af39611 | Paul Brook | TIMER_RUNNING = 1,
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46 | 4af39611 | Paul Brook | TIMER_ONESHOT = 2,
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47 | 4af39611 | Paul Brook | TIMER_LIMIT = 3,
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48 | 4af39611 | Paul Brook | TIMER_VALUE = 4,
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49 | 4af39611 | Paul Brook | TIMER_INT_ENABLE = 5,
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50 | 4af39611 | Paul Brook | TIMER_INT_STATUS = 6,
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51 | 4af39611 | Paul Brook | TIMER_FREQ = 7
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52 | 4af39611 | Paul Brook | }; |
53 | 4af39611 | Paul Brook | |
54 | 4af39611 | Paul Brook | typedef struct { |
55 | 4af39611 | Paul Brook | SysBusDevice busdev; |
56 | 4af39611 | Paul Brook | ptimer_state *timer; |
57 | 4af39611 | Paul Brook | int running;
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58 | 4af39611 | Paul Brook | int oneshot;
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59 | 4af39611 | Paul Brook | uint32_t limit; |
60 | 4af39611 | Paul Brook | uint32_t freq; |
61 | 4af39611 | Paul Brook | uint32_t int_level; |
62 | 4af39611 | Paul Brook | uint32_t int_enabled; |
63 | 4af39611 | Paul Brook | qemu_irq irq; |
64 | 4af39611 | Paul Brook | } SyborgTimerState; |
65 | 4af39611 | Paul Brook | |
66 | 4af39611 | Paul Brook | static void syborg_timer_update(SyborgTimerState *s) |
67 | 4af39611 | Paul Brook | { |
68 | 4af39611 | Paul Brook | /* Update interrupt. */
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69 | 4af39611 | Paul Brook | if (s->int_level && s->int_enabled) {
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70 | 4af39611 | Paul Brook | qemu_irq_raise(s->irq); |
71 | 4af39611 | Paul Brook | } else {
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72 | 4af39611 | Paul Brook | qemu_irq_lower(s->irq); |
73 | 4af39611 | Paul Brook | } |
74 | 4af39611 | Paul Brook | } |
75 | 4af39611 | Paul Brook | |
76 | 4af39611 | Paul Brook | static void syborg_timer_tick(void *opaque) |
77 | 4af39611 | Paul Brook | { |
78 | 4af39611 | Paul Brook | SyborgTimerState *s = (SyborgTimerState *)opaque; |
79 | 4af39611 | Paul Brook | //DPRINTF("Timer Tick\n");
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80 | 4af39611 | Paul Brook | s->int_level = 1;
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81 | 4af39611 | Paul Brook | if (s->oneshot)
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82 | 4af39611 | Paul Brook | s->running = 0;
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83 | 4af39611 | Paul Brook | syborg_timer_update(s); |
84 | 4af39611 | Paul Brook | } |
85 | 4af39611 | Paul Brook | |
86 | c227f099 | Anthony Liguori | static uint32_t syborg_timer_read(void *opaque, target_phys_addr_t offset) |
87 | 4af39611 | Paul Brook | { |
88 | 4af39611 | Paul Brook | SyborgTimerState *s = (SyborgTimerState *)opaque; |
89 | 4af39611 | Paul Brook | |
90 | 4af39611 | Paul Brook | DPRINTF("Reg read %d\n", (int)offset); |
91 | 4af39611 | Paul Brook | offset &= 0xfff;
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92 | 4af39611 | Paul Brook | switch (offset >> 2) { |
93 | 4af39611 | Paul Brook | case TIMER_ID:
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94 | 4af39611 | Paul Brook | return SYBORG_ID_TIMER;
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95 | 4af39611 | Paul Brook | case TIMER_RUNNING:
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96 | 4af39611 | Paul Brook | return s->running;
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97 | 4af39611 | Paul Brook | case TIMER_ONESHOT:
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98 | 4af39611 | Paul Brook | return s->oneshot;
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99 | 4af39611 | Paul Brook | case TIMER_LIMIT:
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100 | 4af39611 | Paul Brook | return s->limit;
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101 | 4af39611 | Paul Brook | case TIMER_VALUE:
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102 | 4af39611 | Paul Brook | return ptimer_get_count(s->timer);
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103 | 4af39611 | Paul Brook | case TIMER_INT_ENABLE:
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104 | 4af39611 | Paul Brook | return s->int_enabled;
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105 | 4af39611 | Paul Brook | case TIMER_INT_STATUS:
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106 | 4af39611 | Paul Brook | return s->int_level;
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107 | 4af39611 | Paul Brook | case TIMER_FREQ:
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108 | 4af39611 | Paul Brook | return s->freq;
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109 | 4af39611 | Paul Brook | default:
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110 | 4af39611 | Paul Brook | cpu_abort(cpu_single_env, "syborg_timer_read: Bad offset %x\n",
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111 | 4af39611 | Paul Brook | (int)offset);
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112 | 4af39611 | Paul Brook | return 0; |
113 | 4af39611 | Paul Brook | } |
114 | 4af39611 | Paul Brook | } |
115 | 4af39611 | Paul Brook | |
116 | c227f099 | Anthony Liguori | static void syborg_timer_write(void *opaque, target_phys_addr_t offset, |
117 | 4af39611 | Paul Brook | uint32_t value) |
118 | 4af39611 | Paul Brook | { |
119 | 4af39611 | Paul Brook | SyborgTimerState *s = (SyborgTimerState *)opaque; |
120 | 4af39611 | Paul Brook | |
121 | 4af39611 | Paul Brook | DPRINTF("Reg write %d\n", (int)offset); |
122 | 4af39611 | Paul Brook | offset &= 0xfff;
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123 | 4af39611 | Paul Brook | switch (offset >> 2) { |
124 | 4af39611 | Paul Brook | case TIMER_RUNNING:
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125 | 4af39611 | Paul Brook | if (value == s->running)
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126 | 4af39611 | Paul Brook | break;
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127 | 4af39611 | Paul Brook | s->running = value; |
128 | 4af39611 | Paul Brook | if (value) {
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129 | 4af39611 | Paul Brook | ptimer_run(s->timer, s->oneshot); |
130 | 4af39611 | Paul Brook | } else {
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131 | 4af39611 | Paul Brook | ptimer_stop(s->timer); |
132 | 4af39611 | Paul Brook | } |
133 | 4af39611 | Paul Brook | break;
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134 | 4af39611 | Paul Brook | case TIMER_ONESHOT:
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135 | 4af39611 | Paul Brook | if (s->running) {
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136 | 4af39611 | Paul Brook | ptimer_stop(s->timer); |
137 | 4af39611 | Paul Brook | } |
138 | 4af39611 | Paul Brook | s->oneshot = value; |
139 | 4af39611 | Paul Brook | if (s->running) {
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140 | 4af39611 | Paul Brook | ptimer_run(s->timer, s->oneshot); |
141 | 4af39611 | Paul Brook | } |
142 | 4af39611 | Paul Brook | break;
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143 | 4af39611 | Paul Brook | case TIMER_LIMIT:
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144 | 4af39611 | Paul Brook | s->limit = value; |
145 | 4af39611 | Paul Brook | ptimer_set_limit(s->timer, value, 1);
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146 | 4af39611 | Paul Brook | break;
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147 | 4af39611 | Paul Brook | case TIMER_VALUE:
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148 | 4af39611 | Paul Brook | ptimer_set_count(s->timer, value); |
149 | 4af39611 | Paul Brook | break;
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150 | 4af39611 | Paul Brook | case TIMER_INT_ENABLE:
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151 | 4af39611 | Paul Brook | s->int_enabled = value; |
152 | 4af39611 | Paul Brook | syborg_timer_update(s); |
153 | 4af39611 | Paul Brook | break;
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154 | 4af39611 | Paul Brook | case TIMER_INT_STATUS:
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155 | 4af39611 | Paul Brook | s->int_level &= ~value; |
156 | 4af39611 | Paul Brook | syborg_timer_update(s); |
157 | 4af39611 | Paul Brook | break;
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158 | 4af39611 | Paul Brook | default:
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159 | 4af39611 | Paul Brook | cpu_abort(cpu_single_env, "syborg_timer_write: Bad offset %x\n",
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160 | 4af39611 | Paul Brook | (int)offset);
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161 | 4af39611 | Paul Brook | break;
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162 | 4af39611 | Paul Brook | } |
163 | 4af39611 | Paul Brook | } |
164 | 4af39611 | Paul Brook | |
165 | d60efc6b | Blue Swirl | static CPUReadMemoryFunc * const syborg_timer_readfn[] = { |
166 | 4af39611 | Paul Brook | syborg_timer_read, |
167 | 4af39611 | Paul Brook | syborg_timer_read, |
168 | 4af39611 | Paul Brook | syborg_timer_read |
169 | 4af39611 | Paul Brook | }; |
170 | 4af39611 | Paul Brook | |
171 | d60efc6b | Blue Swirl | static CPUWriteMemoryFunc * const syborg_timer_writefn[] = { |
172 | 4af39611 | Paul Brook | syborg_timer_write, |
173 | 4af39611 | Paul Brook | syborg_timer_write, |
174 | 4af39611 | Paul Brook | syborg_timer_write |
175 | 4af39611 | Paul Brook | }; |
176 | 4af39611 | Paul Brook | |
177 | 4af39611 | Paul Brook | static void syborg_timer_save(QEMUFile *f, void *opaque) |
178 | 4af39611 | Paul Brook | { |
179 | 4af39611 | Paul Brook | SyborgTimerState *s = opaque; |
180 | 4af39611 | Paul Brook | |
181 | 4af39611 | Paul Brook | qemu_put_be32(f, s->running); |
182 | 4af39611 | Paul Brook | qemu_put_be32(f, s->oneshot); |
183 | 4af39611 | Paul Brook | qemu_put_be32(f, s->limit); |
184 | 4af39611 | Paul Brook | qemu_put_be32(f, s->int_level); |
185 | 4af39611 | Paul Brook | qemu_put_be32(f, s->int_enabled); |
186 | 4af39611 | Paul Brook | qemu_put_ptimer(f, s->timer); |
187 | 4af39611 | Paul Brook | } |
188 | 4af39611 | Paul Brook | |
189 | 4af39611 | Paul Brook | static int syborg_timer_load(QEMUFile *f, void *opaque, int version_id) |
190 | 4af39611 | Paul Brook | { |
191 | 4af39611 | Paul Brook | SyborgTimerState *s = opaque; |
192 | 4af39611 | Paul Brook | |
193 | 4af39611 | Paul Brook | if (version_id != 1) |
194 | 4af39611 | Paul Brook | return -EINVAL;
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195 | 4af39611 | Paul Brook | |
196 | 4af39611 | Paul Brook | s->running = qemu_get_be32(f); |
197 | 4af39611 | Paul Brook | s->oneshot = qemu_get_be32(f); |
198 | 4af39611 | Paul Brook | s->limit = qemu_get_be32(f); |
199 | 4af39611 | Paul Brook | s->int_level = qemu_get_be32(f); |
200 | 4af39611 | Paul Brook | s->int_enabled = qemu_get_be32(f); |
201 | 4af39611 | Paul Brook | qemu_get_ptimer(f, s->timer); |
202 | 4af39611 | Paul Brook | |
203 | 4af39611 | Paul Brook | return 0; |
204 | 4af39611 | Paul Brook | } |
205 | 4af39611 | Paul Brook | |
206 | 81a322d4 | Gerd Hoffmann | static int syborg_timer_init(SysBusDevice *dev) |
207 | 4af39611 | Paul Brook | { |
208 | 4af39611 | Paul Brook | SyborgTimerState *s = FROM_SYSBUS(SyborgTimerState, dev); |
209 | 4af39611 | Paul Brook | QEMUBH *bh; |
210 | 4af39611 | Paul Brook | int iomemtype;
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211 | 4af39611 | Paul Brook | |
212 | 4af39611 | Paul Brook | if (s->freq == 0) { |
213 | 4af39611 | Paul Brook | fprintf(stderr, "syborg_timer: Zero/unset frequency\n");
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214 | 4af39611 | Paul Brook | exit(1);
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215 | 4af39611 | Paul Brook | } |
216 | 4af39611 | Paul Brook | sysbus_init_irq(dev, &s->irq); |
217 | 1eed09cb | Avi Kivity | iomemtype = cpu_register_io_memory(syborg_timer_readfn, |
218 | 4af39611 | Paul Brook | syborg_timer_writefn, s); |
219 | 4af39611 | Paul Brook | sysbus_init_mmio(dev, 0x1000, iomemtype);
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220 | 4af39611 | Paul Brook | |
221 | 4af39611 | Paul Brook | bh = qemu_bh_new(syborg_timer_tick, s); |
222 | 4af39611 | Paul Brook | s->timer = ptimer_init(bh); |
223 | 4af39611 | Paul Brook | ptimer_set_freq(s->timer, s->freq); |
224 | 4af39611 | Paul Brook | register_savevm("syborg_timer", -1, 1, |
225 | 4af39611 | Paul Brook | syborg_timer_save, syborg_timer_load, s); |
226 | 81a322d4 | Gerd Hoffmann | return 0; |
227 | 4af39611 | Paul Brook | } |
228 | 4af39611 | Paul Brook | |
229 | 1431b6a1 | Paul Brook | static SysBusDeviceInfo syborg_timer_info = {
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230 | 1431b6a1 | Paul Brook | .init = syborg_timer_init, |
231 | 074f2fff | Gerd Hoffmann | .qdev.name = "syborg,timer",
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232 | 074f2fff | Gerd Hoffmann | .qdev.size = sizeof(SyborgTimerState),
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233 | ee6847d1 | Gerd Hoffmann | .qdev.props = (Property[]) { |
234 | 083301fc | Gerd Hoffmann | DEFINE_PROP_UINT32("frequency",SyborgTimerState, freq, 0), |
235 | 083301fc | Gerd Hoffmann | DEFINE_PROP_END_OF_LIST(), |
236 | 1431b6a1 | Paul Brook | } |
237 | 1431b6a1 | Paul Brook | }; |
238 | 1431b6a1 | Paul Brook | |
239 | 4af39611 | Paul Brook | static void syborg_timer_register_devices(void) |
240 | 4af39611 | Paul Brook | { |
241 | 074f2fff | Gerd Hoffmann | sysbus_register_withprop(&syborg_timer_info); |
242 | 4af39611 | Paul Brook | } |
243 | 4af39611 | Paul Brook | |
244 | 4af39611 | Paul Brook | device_init(syborg_timer_register_devices) |