root / hw / arm_timer.c @ c75a823c
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1 | 5fafdf24 | ths | /*
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2 | cdbdb648 | pbrook | * ARM PrimeCell Timer modules.
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3 | cdbdb648 | pbrook | *
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4 | cdbdb648 | pbrook | * Copyright (c) 2005-2006 CodeSourcery.
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5 | cdbdb648 | pbrook | * Written by Paul Brook
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6 | cdbdb648 | pbrook | *
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7 | cdbdb648 | pbrook | * This code is licenced under the GPL.
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8 | cdbdb648 | pbrook | */
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9 | cdbdb648 | pbrook | |
10 | 87ecb68b | pbrook | #include "hw.h" |
11 | 87ecb68b | pbrook | #include "qemu-timer.h" |
12 | 9596ebb7 | pbrook | #include "primecell.h" |
13 | cdbdb648 | pbrook | |
14 | cdbdb648 | pbrook | /* Common timer implementation. */
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15 | cdbdb648 | pbrook | |
16 | cdbdb648 | pbrook | #define TIMER_CTRL_ONESHOT (1 << 0) |
17 | cdbdb648 | pbrook | #define TIMER_CTRL_32BIT (1 << 1) |
18 | cdbdb648 | pbrook | #define TIMER_CTRL_DIV1 (0 << 2) |
19 | cdbdb648 | pbrook | #define TIMER_CTRL_DIV16 (1 << 2) |
20 | cdbdb648 | pbrook | #define TIMER_CTRL_DIV256 (2 << 2) |
21 | cdbdb648 | pbrook | #define TIMER_CTRL_IE (1 << 5) |
22 | cdbdb648 | pbrook | #define TIMER_CTRL_PERIODIC (1 << 6) |
23 | cdbdb648 | pbrook | #define TIMER_CTRL_ENABLE (1 << 7) |
24 | cdbdb648 | pbrook | |
25 | cdbdb648 | pbrook | typedef struct { |
26 | 423f0742 | pbrook | ptimer_state *timer; |
27 | cdbdb648 | pbrook | uint32_t control; |
28 | cdbdb648 | pbrook | uint32_t limit; |
29 | cdbdb648 | pbrook | int freq;
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30 | cdbdb648 | pbrook | int int_level;
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31 | d537cf6c | pbrook | qemu_irq irq; |
32 | cdbdb648 | pbrook | } arm_timer_state; |
33 | cdbdb648 | pbrook | |
34 | cdbdb648 | pbrook | /* Check all active timers, and schedule the next timer interrupt. */
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35 | cdbdb648 | pbrook | |
36 | 423f0742 | pbrook | static void arm_timer_update(arm_timer_state *s) |
37 | cdbdb648 | pbrook | { |
38 | cdbdb648 | pbrook | /* Update interrupts. */
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39 | cdbdb648 | pbrook | if (s->int_level && (s->control & TIMER_CTRL_IE)) {
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40 | d537cf6c | pbrook | qemu_irq_raise(s->irq); |
41 | cdbdb648 | pbrook | } else {
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42 | d537cf6c | pbrook | qemu_irq_lower(s->irq); |
43 | cdbdb648 | pbrook | } |
44 | cdbdb648 | pbrook | } |
45 | cdbdb648 | pbrook | |
46 | 9596ebb7 | pbrook | static uint32_t arm_timer_read(void *opaque, target_phys_addr_t offset) |
47 | cdbdb648 | pbrook | { |
48 | cdbdb648 | pbrook | arm_timer_state *s = (arm_timer_state *)opaque; |
49 | cdbdb648 | pbrook | |
50 | cdbdb648 | pbrook | switch (offset >> 2) { |
51 | cdbdb648 | pbrook | case 0: /* TimerLoad */ |
52 | cdbdb648 | pbrook | case 6: /* TimerBGLoad */ |
53 | cdbdb648 | pbrook | return s->limit;
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54 | cdbdb648 | pbrook | case 1: /* TimerValue */ |
55 | 423f0742 | pbrook | return ptimer_get_count(s->timer);
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56 | cdbdb648 | pbrook | case 2: /* TimerControl */ |
57 | cdbdb648 | pbrook | return s->control;
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58 | cdbdb648 | pbrook | case 4: /* TimerRIS */ |
59 | cdbdb648 | pbrook | return s->int_level;
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60 | cdbdb648 | pbrook | case 5: /* TimerMIS */ |
61 | cdbdb648 | pbrook | if ((s->control & TIMER_CTRL_IE) == 0) |
62 | cdbdb648 | pbrook | return 0; |
63 | cdbdb648 | pbrook | return s->int_level;
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64 | cdbdb648 | pbrook | default:
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65 | 423f0742 | pbrook | cpu_abort (cpu_single_env, "arm_timer_read: Bad offset %x\n",
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66 | 423f0742 | pbrook | (int)offset);
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67 | cdbdb648 | pbrook | return 0; |
68 | cdbdb648 | pbrook | } |
69 | cdbdb648 | pbrook | } |
70 | cdbdb648 | pbrook | |
71 | 423f0742 | pbrook | /* Reset the timer limit after settings have changed. */
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72 | 423f0742 | pbrook | static void arm_timer_recalibrate(arm_timer_state *s, int reload) |
73 | 423f0742 | pbrook | { |
74 | 423f0742 | pbrook | uint32_t limit; |
75 | 423f0742 | pbrook | |
76 | 423f0742 | pbrook | if ((s->control & TIMER_CTRL_PERIODIC) == 0) { |
77 | 423f0742 | pbrook | /* Free running. */
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78 | 423f0742 | pbrook | if (s->control & TIMER_CTRL_32BIT)
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79 | 423f0742 | pbrook | limit = 0xffffffff;
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80 | 423f0742 | pbrook | else
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81 | 423f0742 | pbrook | limit = 0xffff;
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82 | 423f0742 | pbrook | } else {
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83 | 423f0742 | pbrook | /* Periodic. */
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84 | 423f0742 | pbrook | limit = s->limit; |
85 | 423f0742 | pbrook | } |
86 | 423f0742 | pbrook | ptimer_set_limit(s->timer, limit, reload); |
87 | 423f0742 | pbrook | } |
88 | 423f0742 | pbrook | |
89 | cdbdb648 | pbrook | static void arm_timer_write(void *opaque, target_phys_addr_t offset, |
90 | cdbdb648 | pbrook | uint32_t value) |
91 | cdbdb648 | pbrook | { |
92 | cdbdb648 | pbrook | arm_timer_state *s = (arm_timer_state *)opaque; |
93 | 423f0742 | pbrook | int freq;
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94 | cdbdb648 | pbrook | |
95 | cdbdb648 | pbrook | switch (offset >> 2) { |
96 | cdbdb648 | pbrook | case 0: /* TimerLoad */ |
97 | cdbdb648 | pbrook | s->limit = value; |
98 | 423f0742 | pbrook | arm_timer_recalibrate(s, 1);
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99 | cdbdb648 | pbrook | break;
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100 | cdbdb648 | pbrook | case 1: /* TimerValue */ |
101 | cdbdb648 | pbrook | /* ??? Linux seems to want to write to this readonly register.
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102 | cdbdb648 | pbrook | Ignore it. */
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103 | cdbdb648 | pbrook | break;
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104 | cdbdb648 | pbrook | case 2: /* TimerControl */ |
105 | cdbdb648 | pbrook | if (s->control & TIMER_CTRL_ENABLE) {
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106 | cdbdb648 | pbrook | /* Pause the timer if it is running. This may cause some
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107 | cdbdb648 | pbrook | inaccuracy dure to rounding, but avoids a whole lot of other
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108 | cdbdb648 | pbrook | messyness. */
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109 | 423f0742 | pbrook | ptimer_stop(s->timer); |
110 | cdbdb648 | pbrook | } |
111 | cdbdb648 | pbrook | s->control = value; |
112 | 423f0742 | pbrook | freq = s->freq; |
113 | cdbdb648 | pbrook | /* ??? Need to recalculate expiry time after changing divisor. */
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114 | cdbdb648 | pbrook | switch ((value >> 2) & 3) { |
115 | 423f0742 | pbrook | case 1: freq >>= 4; break; |
116 | 423f0742 | pbrook | case 2: freq >>= 8; break; |
117 | cdbdb648 | pbrook | } |
118 | 423f0742 | pbrook | arm_timer_recalibrate(s, 0);
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119 | 423f0742 | pbrook | ptimer_set_freq(s->timer, freq); |
120 | cdbdb648 | pbrook | if (s->control & TIMER_CTRL_ENABLE) {
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121 | cdbdb648 | pbrook | /* Restart the timer if still enabled. */
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122 | 423f0742 | pbrook | ptimer_run(s->timer, (s->control & TIMER_CTRL_ONESHOT) != 0);
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123 | cdbdb648 | pbrook | } |
124 | cdbdb648 | pbrook | break;
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125 | cdbdb648 | pbrook | case 3: /* TimerIntClr */ |
126 | cdbdb648 | pbrook | s->int_level = 0;
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127 | cdbdb648 | pbrook | break;
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128 | cdbdb648 | pbrook | case 6: /* TimerBGLoad */ |
129 | cdbdb648 | pbrook | s->limit = value; |
130 | 423f0742 | pbrook | arm_timer_recalibrate(s, 0);
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131 | cdbdb648 | pbrook | break;
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132 | cdbdb648 | pbrook | default:
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133 | 423f0742 | pbrook | cpu_abort (cpu_single_env, "arm_timer_write: Bad offset %x\n",
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134 | 423f0742 | pbrook | (int)offset);
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135 | cdbdb648 | pbrook | } |
136 | 423f0742 | pbrook | arm_timer_update(s); |
137 | cdbdb648 | pbrook | } |
138 | cdbdb648 | pbrook | |
139 | cdbdb648 | pbrook | static void arm_timer_tick(void *opaque) |
140 | cdbdb648 | pbrook | { |
141 | 423f0742 | pbrook | arm_timer_state *s = (arm_timer_state *)opaque; |
142 | 423f0742 | pbrook | s->int_level = 1;
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143 | 423f0742 | pbrook | arm_timer_update(s); |
144 | cdbdb648 | pbrook | } |
145 | cdbdb648 | pbrook | |
146 | d537cf6c | pbrook | static void *arm_timer_init(uint32_t freq, qemu_irq irq) |
147 | cdbdb648 | pbrook | { |
148 | cdbdb648 | pbrook | arm_timer_state *s; |
149 | 423f0742 | pbrook | QEMUBH *bh; |
150 | cdbdb648 | pbrook | |
151 | cdbdb648 | pbrook | s = (arm_timer_state *)qemu_mallocz(sizeof(arm_timer_state));
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152 | cdbdb648 | pbrook | s->irq = irq; |
153 | 423f0742 | pbrook | s->freq = freq; |
154 | cdbdb648 | pbrook | s->control = TIMER_CTRL_IE; |
155 | cdbdb648 | pbrook | |
156 | 423f0742 | pbrook | bh = qemu_bh_new(arm_timer_tick, s); |
157 | 423f0742 | pbrook | s->timer = ptimer_init(bh); |
158 | cdbdb648 | pbrook | /* ??? Save/restore. */
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159 | cdbdb648 | pbrook | return s;
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160 | cdbdb648 | pbrook | } |
161 | cdbdb648 | pbrook | |
162 | cdbdb648 | pbrook | /* ARM PrimeCell SP804 dual timer module.
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163 | cdbdb648 | pbrook | Docs for this device don't seem to be publicly available. This
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164 | d85fb99b | pbrook | implementation is based on guesswork, the linux kernel sources and the
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165 | cdbdb648 | pbrook | Integrator/CP timer modules. */
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166 | cdbdb648 | pbrook | |
167 | cdbdb648 | pbrook | typedef struct { |
168 | cdbdb648 | pbrook | void *timer[2]; |
169 | cdbdb648 | pbrook | int level[2]; |
170 | cdbdb648 | pbrook | uint32_t base; |
171 | d537cf6c | pbrook | qemu_irq irq; |
172 | cdbdb648 | pbrook | } sp804_state; |
173 | cdbdb648 | pbrook | |
174 | d537cf6c | pbrook | /* Merge the IRQs from the two component devices. */
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175 | cdbdb648 | pbrook | static void sp804_set_irq(void *opaque, int irq, int level) |
176 | cdbdb648 | pbrook | { |
177 | cdbdb648 | pbrook | sp804_state *s = (sp804_state *)opaque; |
178 | cdbdb648 | pbrook | |
179 | cdbdb648 | pbrook | s->level[irq] = level; |
180 | d537cf6c | pbrook | qemu_set_irq(s->irq, s->level[0] || s->level[1]); |
181 | cdbdb648 | pbrook | } |
182 | cdbdb648 | pbrook | |
183 | cdbdb648 | pbrook | static uint32_t sp804_read(void *opaque, target_phys_addr_t offset) |
184 | cdbdb648 | pbrook | { |
185 | cdbdb648 | pbrook | sp804_state *s = (sp804_state *)opaque; |
186 | cdbdb648 | pbrook | |
187 | cdbdb648 | pbrook | /* ??? Don't know the PrimeCell ID for this device. */
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188 | cdbdb648 | pbrook | offset -= s->base; |
189 | cdbdb648 | pbrook | if (offset < 0x20) { |
190 | cdbdb648 | pbrook | return arm_timer_read(s->timer[0], offset); |
191 | cdbdb648 | pbrook | } else {
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192 | cdbdb648 | pbrook | return arm_timer_read(s->timer[1], offset - 0x20); |
193 | cdbdb648 | pbrook | } |
194 | cdbdb648 | pbrook | } |
195 | cdbdb648 | pbrook | |
196 | cdbdb648 | pbrook | static void sp804_write(void *opaque, target_phys_addr_t offset, |
197 | cdbdb648 | pbrook | uint32_t value) |
198 | cdbdb648 | pbrook | { |
199 | cdbdb648 | pbrook | sp804_state *s = (sp804_state *)opaque; |
200 | cdbdb648 | pbrook | |
201 | cdbdb648 | pbrook | offset -= s->base; |
202 | cdbdb648 | pbrook | if (offset < 0x20) { |
203 | cdbdb648 | pbrook | arm_timer_write(s->timer[0], offset, value);
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204 | cdbdb648 | pbrook | } else {
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205 | cdbdb648 | pbrook | arm_timer_write(s->timer[1], offset - 0x20, value); |
206 | cdbdb648 | pbrook | } |
207 | cdbdb648 | pbrook | } |
208 | cdbdb648 | pbrook | |
209 | cdbdb648 | pbrook | static CPUReadMemoryFunc *sp804_readfn[] = {
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210 | cdbdb648 | pbrook | sp804_read, |
211 | cdbdb648 | pbrook | sp804_read, |
212 | cdbdb648 | pbrook | sp804_read |
213 | cdbdb648 | pbrook | }; |
214 | cdbdb648 | pbrook | |
215 | cdbdb648 | pbrook | static CPUWriteMemoryFunc *sp804_writefn[] = {
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216 | cdbdb648 | pbrook | sp804_write, |
217 | cdbdb648 | pbrook | sp804_write, |
218 | cdbdb648 | pbrook | sp804_write |
219 | cdbdb648 | pbrook | }; |
220 | cdbdb648 | pbrook | |
221 | d537cf6c | pbrook | void sp804_init(uint32_t base, qemu_irq irq)
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222 | cdbdb648 | pbrook | { |
223 | cdbdb648 | pbrook | int iomemtype;
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224 | cdbdb648 | pbrook | sp804_state *s; |
225 | d537cf6c | pbrook | qemu_irq *qi; |
226 | cdbdb648 | pbrook | |
227 | cdbdb648 | pbrook | s = (sp804_state *)qemu_mallocz(sizeof(sp804_state));
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228 | d537cf6c | pbrook | qi = qemu_allocate_irqs(sp804_set_irq, s, 2);
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229 | cdbdb648 | pbrook | s->base = base; |
230 | cdbdb648 | pbrook | s->irq = irq; |
231 | cdbdb648 | pbrook | /* ??? The timers are actually configurable between 32kHz and 1MHz, but
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232 | cdbdb648 | pbrook | we don't implement that. */
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233 | d537cf6c | pbrook | s->timer[0] = arm_timer_init(1000000, qi[0]); |
234 | d537cf6c | pbrook | s->timer[1] = arm_timer_init(1000000, qi[1]); |
235 | cdbdb648 | pbrook | iomemtype = cpu_register_io_memory(0, sp804_readfn,
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236 | cdbdb648 | pbrook | sp804_writefn, s); |
237 | 187337f8 | pbrook | cpu_register_physical_memory(base, 0x00001000, iomemtype);
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238 | cdbdb648 | pbrook | /* ??? Save/restore. */
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239 | cdbdb648 | pbrook | } |
240 | cdbdb648 | pbrook | |
241 | cdbdb648 | pbrook | |
242 | cdbdb648 | pbrook | /* Integrator/CP timer module. */
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243 | cdbdb648 | pbrook | |
244 | cdbdb648 | pbrook | typedef struct { |
245 | cdbdb648 | pbrook | void *timer[3]; |
246 | cdbdb648 | pbrook | uint32_t base; |
247 | cdbdb648 | pbrook | } icp_pit_state; |
248 | cdbdb648 | pbrook | |
249 | cdbdb648 | pbrook | static uint32_t icp_pit_read(void *opaque, target_phys_addr_t offset) |
250 | cdbdb648 | pbrook | { |
251 | cdbdb648 | pbrook | icp_pit_state *s = (icp_pit_state *)opaque; |
252 | cdbdb648 | pbrook | int n;
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253 | cdbdb648 | pbrook | |
254 | cdbdb648 | pbrook | /* ??? Don't know the PrimeCell ID for this device. */
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255 | cdbdb648 | pbrook | offset -= s->base; |
256 | cdbdb648 | pbrook | n = offset >> 8;
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257 | cdbdb648 | pbrook | if (n > 3) |
258 | cdbdb648 | pbrook | cpu_abort(cpu_single_env, "sp804_read: Bad timer %d\n", n);
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259 | cdbdb648 | pbrook | |
260 | cdbdb648 | pbrook | return arm_timer_read(s->timer[n], offset & 0xff); |
261 | cdbdb648 | pbrook | } |
262 | cdbdb648 | pbrook | |
263 | cdbdb648 | pbrook | static void icp_pit_write(void *opaque, target_phys_addr_t offset, |
264 | cdbdb648 | pbrook | uint32_t value) |
265 | cdbdb648 | pbrook | { |
266 | cdbdb648 | pbrook | icp_pit_state *s = (icp_pit_state *)opaque; |
267 | cdbdb648 | pbrook | int n;
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268 | cdbdb648 | pbrook | |
269 | cdbdb648 | pbrook | offset -= s->base; |
270 | cdbdb648 | pbrook | n = offset >> 8;
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271 | cdbdb648 | pbrook | if (n > 3) |
272 | cdbdb648 | pbrook | cpu_abort(cpu_single_env, "sp804_write: Bad timer %d\n", n);
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273 | cdbdb648 | pbrook | |
274 | cdbdb648 | pbrook | arm_timer_write(s->timer[n], offset & 0xff, value);
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275 | cdbdb648 | pbrook | } |
276 | cdbdb648 | pbrook | |
277 | cdbdb648 | pbrook | |
278 | cdbdb648 | pbrook | static CPUReadMemoryFunc *icp_pit_readfn[] = {
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279 | cdbdb648 | pbrook | icp_pit_read, |
280 | cdbdb648 | pbrook | icp_pit_read, |
281 | cdbdb648 | pbrook | icp_pit_read |
282 | cdbdb648 | pbrook | }; |
283 | cdbdb648 | pbrook | |
284 | cdbdb648 | pbrook | static CPUWriteMemoryFunc *icp_pit_writefn[] = {
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285 | cdbdb648 | pbrook | icp_pit_write, |
286 | cdbdb648 | pbrook | icp_pit_write, |
287 | cdbdb648 | pbrook | icp_pit_write |
288 | cdbdb648 | pbrook | }; |
289 | cdbdb648 | pbrook | |
290 | d537cf6c | pbrook | void icp_pit_init(uint32_t base, qemu_irq *pic, int irq) |
291 | cdbdb648 | pbrook | { |
292 | cdbdb648 | pbrook | int iomemtype;
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293 | cdbdb648 | pbrook | icp_pit_state *s; |
294 | cdbdb648 | pbrook | |
295 | cdbdb648 | pbrook | s = (icp_pit_state *)qemu_mallocz(sizeof(icp_pit_state));
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296 | cdbdb648 | pbrook | s->base = base; |
297 | cdbdb648 | pbrook | /* Timer 0 runs at the system clock speed (40MHz). */
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298 | d537cf6c | pbrook | s->timer[0] = arm_timer_init(40000000, pic[irq]); |
299 | cdbdb648 | pbrook | /* The other two timers run at 1MHz. */
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300 | d537cf6c | pbrook | s->timer[1] = arm_timer_init(1000000, pic[irq + 1]); |
301 | d537cf6c | pbrook | s->timer[2] = arm_timer_init(1000000, pic[irq + 2]); |
302 | cdbdb648 | pbrook | |
303 | cdbdb648 | pbrook | iomemtype = cpu_register_io_memory(0, icp_pit_readfn,
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304 | cdbdb648 | pbrook | icp_pit_writefn, s); |
305 | 187337f8 | pbrook | cpu_register_physical_memory(base, 0x00001000, iomemtype);
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306 | cdbdb648 | pbrook | /* ??? Save/restore. */
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307 | cdbdb648 | pbrook | } |