PPC: e500mc: add missing IVORs to bitmap
[qemu.git] / hw / grlib_gptimer.c
1 /*
2 * QEMU GRLIB GPTimer Emulator
3 *
4 * Copyright (c) 2010-2011 AdaCore
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "sysbus.h"
26 #include "qemu-timer.h"
27 #include "ptimer.h"
28
29 #include "trace.h"
30
31 #define UNIT_REG_SIZE 16 /* Size of memory mapped regs for the unit */
32 #define GPTIMER_REG_SIZE 16 /* Size of memory mapped regs for a GPTimer */
33
34 #define GPTIMER_MAX_TIMERS 8
35
36 /* GPTimer Config register fields */
37 #define GPTIMER_ENABLE (1 << 0)
38 #define GPTIMER_RESTART (1 << 1)
39 #define GPTIMER_LOAD (1 << 2)
40 #define GPTIMER_INT_ENABLE (1 << 3)
41 #define GPTIMER_INT_PENDING (1 << 4)
42 #define GPTIMER_CHAIN (1 << 5) /* Not supported */
43 #define GPTIMER_DEBUG_HALT (1 << 6) /* Not supported */
44
45 /* Memory mapped register offsets */
46 #define SCALER_OFFSET 0x00
47 #define SCALER_RELOAD_OFFSET 0x04
48 #define CONFIG_OFFSET 0x08
49 #define COUNTER_OFFSET 0x00
50 #define COUNTER_RELOAD_OFFSET 0x04
51 #define TIMER_BASE 0x10
52
53 typedef struct GPTimer GPTimer;
54 typedef struct GPTimerUnit GPTimerUnit;
55
56 struct GPTimer {
57 QEMUBH *bh;
58 struct ptimer_state *ptimer;
59
60 qemu_irq irq;
61 int id;
62 GPTimerUnit *unit;
63
64 /* registers */
65 uint32_t counter;
66 uint32_t reload;
67 uint32_t config;
68 };
69
70 struct GPTimerUnit {
71 SysBusDevice busdev;
72 MemoryRegion iomem;
73
74 uint32_t nr_timers; /* Number of timers available */
75 uint32_t freq_hz; /* System frequency */
76 uint32_t irq_line; /* Base irq line */
77
78 GPTimer *timers;
79
80 /* registers */
81 uint32_t scaler;
82 uint32_t reload;
83 uint32_t config;
84 };
85
86 static void grlib_gptimer_enable(GPTimer *timer)
87 {
88 assert(timer != NULL);
89
90
91 ptimer_stop(timer->ptimer);
92
93 if (!(timer->config & GPTIMER_ENABLE)) {
94 /* Timer disabled */
95 trace_grlib_gptimer_disabled(timer->id, timer->config);
96 return;
97 }
98
99 /* ptimer is triggered when the counter reach 0 but GPTimer is triggered at
100 underflow. Set count + 1 to simulate the GPTimer behavior. */
101
102 trace_grlib_gptimer_enable(timer->id, timer->counter + 1);
103
104 ptimer_set_count(timer->ptimer, timer->counter + 1);
105 ptimer_run(timer->ptimer, 1);
106 }
107
108 static void grlib_gptimer_restart(GPTimer *timer)
109 {
110 assert(timer != NULL);
111
112 trace_grlib_gptimer_restart(timer->id, timer->reload);
113
114 timer->counter = timer->reload;
115 grlib_gptimer_enable(timer);
116 }
117
118 static void grlib_gptimer_set_scaler(GPTimerUnit *unit, uint32_t scaler)
119 {
120 int i = 0;
121 uint32_t value = 0;
122
123 assert(unit != NULL);
124
125 if (scaler > 0) {
126 value = unit->freq_hz / (scaler + 1);
127 } else {
128 value = unit->freq_hz;
129 }
130
131 trace_grlib_gptimer_set_scaler(scaler, value);
132
133 for (i = 0; i < unit->nr_timers; i++) {
134 ptimer_set_freq(unit->timers[i].ptimer, value);
135 }
136 }
137
138 static void grlib_gptimer_hit(void *opaque)
139 {
140 GPTimer *timer = opaque;
141 assert(timer != NULL);
142
143 trace_grlib_gptimer_hit(timer->id);
144
145 /* Timer expired */
146
147 if (timer->config & GPTIMER_INT_ENABLE) {
148 /* Set the pending bit (only unset by write in the config register) */
149 timer->config |= GPTIMER_INT_PENDING;
150 qemu_irq_pulse(timer->irq);
151 }
152
153 if (timer->config & GPTIMER_RESTART) {
154 grlib_gptimer_restart(timer);
155 }
156 }
157
158 static uint64_t grlib_gptimer_read(void *opaque, target_phys_addr_t addr,
159 unsigned size)
160 {
161 GPTimerUnit *unit = opaque;
162 target_phys_addr_t timer_addr;
163 int id;
164 uint32_t value = 0;
165
166 addr &= 0xff;
167
168 /* Unit registers */
169 switch (addr) {
170 case SCALER_OFFSET:
171 trace_grlib_gptimer_readl(-1, addr, unit->scaler);
172 return unit->scaler;
173
174 case SCALER_RELOAD_OFFSET:
175 trace_grlib_gptimer_readl(-1, addr, unit->reload);
176 return unit->reload;
177
178 case CONFIG_OFFSET:
179 trace_grlib_gptimer_readl(-1, addr, unit->config);
180 return unit->config;
181
182 default:
183 break;
184 }
185
186 timer_addr = (addr % TIMER_BASE);
187 id = (addr - TIMER_BASE) / TIMER_BASE;
188
189 if (id >= 0 && id < unit->nr_timers) {
190
191 /* GPTimer registers */
192 switch (timer_addr) {
193 case COUNTER_OFFSET:
194 value = ptimer_get_count(unit->timers[id].ptimer);
195 trace_grlib_gptimer_readl(id, addr, value);
196 return value;
197
198 case COUNTER_RELOAD_OFFSET:
199 value = unit->timers[id].reload;
200 trace_grlib_gptimer_readl(id, addr, value);
201 return value;
202
203 case CONFIG_OFFSET:
204 trace_grlib_gptimer_readl(id, addr, unit->timers[id].config);
205 return unit->timers[id].config;
206
207 default:
208 break;
209 }
210
211 }
212
213 trace_grlib_gptimer_readl(-1, addr, 0);
214 return 0;
215 }
216
217 static void grlib_gptimer_write(void *opaque, target_phys_addr_t addr,
218 uint64_t value, unsigned size)
219 {
220 GPTimerUnit *unit = opaque;
221 target_phys_addr_t timer_addr;
222 int id;
223
224 addr &= 0xff;
225
226 /* Unit registers */
227 switch (addr) {
228 case SCALER_OFFSET:
229 value &= 0xFFFF; /* clean up the value */
230 unit->scaler = value;
231 trace_grlib_gptimer_writel(-1, addr, unit->scaler);
232 return;
233
234 case SCALER_RELOAD_OFFSET:
235 value &= 0xFFFF; /* clean up the value */
236 unit->reload = value;
237 trace_grlib_gptimer_writel(-1, addr, unit->reload);
238 grlib_gptimer_set_scaler(unit, value);
239 return;
240
241 case CONFIG_OFFSET:
242 /* Read Only (disable timer freeze not supported) */
243 trace_grlib_gptimer_writel(-1, addr, 0);
244 return;
245
246 default:
247 break;
248 }
249
250 timer_addr = (addr % TIMER_BASE);
251 id = (addr - TIMER_BASE) / TIMER_BASE;
252
253 if (id >= 0 && id < unit->nr_timers) {
254
255 /* GPTimer registers */
256 switch (timer_addr) {
257 case COUNTER_OFFSET:
258 trace_grlib_gptimer_writel(id, addr, value);
259 unit->timers[id].counter = value;
260 grlib_gptimer_enable(&unit->timers[id]);
261 return;
262
263 case COUNTER_RELOAD_OFFSET:
264 trace_grlib_gptimer_writel(id, addr, value);
265 unit->timers[id].reload = value;
266 return;
267
268 case CONFIG_OFFSET:
269 trace_grlib_gptimer_writel(id, addr, value);
270
271 if (value & GPTIMER_INT_PENDING) {
272 /* clear pending bit */
273 value &= ~GPTIMER_INT_PENDING;
274 } else {
275 /* keep pending bit */
276 value |= unit->timers[id].config & GPTIMER_INT_PENDING;
277 }
278
279 unit->timers[id].config = value;
280
281 /* gptimer_restart calls gptimer_enable, so if "enable" and "load"
282 bits are present, we just have to call restart. */
283
284 if (value & GPTIMER_LOAD) {
285 grlib_gptimer_restart(&unit->timers[id]);
286 } else if (value & GPTIMER_ENABLE) {
287 grlib_gptimer_enable(&unit->timers[id]);
288 }
289
290 /* These fields must always be read as 0 */
291 value &= ~(GPTIMER_LOAD & GPTIMER_DEBUG_HALT);
292
293 unit->timers[id].config = value;
294 return;
295
296 default:
297 break;
298 }
299
300 }
301
302 trace_grlib_gptimer_writel(-1, addr, value);
303 }
304
305 static const MemoryRegionOps grlib_gptimer_ops = {
306 .read = grlib_gptimer_read,
307 .write = grlib_gptimer_write,
308 .endianness = DEVICE_NATIVE_ENDIAN,
309 .valid = {
310 .min_access_size = 4,
311 .max_access_size = 4,
312 },
313 };
314
315 static void grlib_gptimer_reset(DeviceState *d)
316 {
317 GPTimerUnit *unit = container_of(d, GPTimerUnit, busdev.qdev);
318 int i = 0;
319
320 assert(unit != NULL);
321
322 unit->scaler = 0;
323 unit->reload = 0;
324 unit->config = 0;
325
326 unit->config = unit->nr_timers;
327 unit->config |= unit->irq_line << 3;
328 unit->config |= 1 << 8; /* separate interrupt */
329 unit->config |= 1 << 9; /* Disable timer freeze */
330
331
332 for (i = 0; i < unit->nr_timers; i++) {
333 GPTimer *timer = &unit->timers[i];
334
335 timer->counter = 0;
336 timer->reload = 0;
337 timer->config = 0;
338 ptimer_stop(timer->ptimer);
339 ptimer_set_count(timer->ptimer, 0);
340 ptimer_set_freq(timer->ptimer, unit->freq_hz);
341 }
342 }
343
344 static int grlib_gptimer_init(SysBusDevice *dev)
345 {
346 GPTimerUnit *unit = FROM_SYSBUS(typeof(*unit), dev);
347 unsigned int i;
348
349 assert(unit->nr_timers > 0);
350 assert(unit->nr_timers <= GPTIMER_MAX_TIMERS);
351
352 unit->timers = g_malloc0(sizeof unit->timers[0] * unit->nr_timers);
353
354 for (i = 0; i < unit->nr_timers; i++) {
355 GPTimer *timer = &unit->timers[i];
356
357 timer->unit = unit;
358 timer->bh = qemu_bh_new(grlib_gptimer_hit, timer);
359 timer->ptimer = ptimer_init(timer->bh);
360 timer->id = i;
361
362 /* One IRQ line for each timer */
363 sysbus_init_irq(dev, &timer->irq);
364
365 ptimer_set_freq(timer->ptimer, unit->freq_hz);
366 }
367
368 memory_region_init_io(&unit->iomem, &grlib_gptimer_ops, unit, "gptimer",
369 UNIT_REG_SIZE + GPTIMER_REG_SIZE * unit->nr_timers);
370
371 sysbus_init_mmio(dev, &unit->iomem);
372 return 0;
373 }
374
375 static Property grlib_gptimer_properties[] = {
376 DEFINE_PROP_UINT32("frequency", GPTimerUnit, freq_hz, 40000000),
377 DEFINE_PROP_UINT32("irq-line", GPTimerUnit, irq_line, 8),
378 DEFINE_PROP_UINT32("nr-timers", GPTimerUnit, nr_timers, 2),
379 DEFINE_PROP_END_OF_LIST(),
380 };
381
382 static void grlib_gptimer_class_init(ObjectClass *klass, void *data)
383 {
384 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
385
386 k->init = grlib_gptimer_init;
387 }
388
389 static DeviceInfo grlib_gptimer_info = {
390 .name = "grlib,gptimer",
391 .reset = grlib_gptimer_reset,
392 .size = sizeof(GPTimerUnit),
393 .props = grlib_gptimer_properties,
394 .class_init = grlib_gptimer_class_init,
395 };
396
397 static void grlib_gptimer_register(void)
398 {
399 sysbus_register_withprop(&grlib_gptimer_info);
400 }
401
402 device_init(grlib_gptimer_register)