Merge tag 'seabios-20211203-pull-request' of git://git.kraxel.org/qemu into staging
[qemu.git] / hw / timer / etraxfs_timer.c
1 /*
2 * QEMU ETRAX Timers
3 *
4 * Copyright (c) 2007 Edgar E. Iglesias, Axis Communications AB.
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 "qemu/osdep.h"
26 #include "hw/sysbus.h"
27 #include "sysemu/reset.h"
28 #include "sysemu/runstate.h"
29 #include "qemu/module.h"
30 #include "qemu/timer.h"
31 #include "hw/irq.h"
32 #include "hw/ptimer.h"
33 #include "qom/object.h"
34
35 #define D(x)
36
37 #define RW_TMR0_DIV 0x00
38 #define R_TMR0_DATA 0x04
39 #define RW_TMR0_CTRL 0x08
40 #define RW_TMR1_DIV 0x10
41 #define R_TMR1_DATA 0x14
42 #define RW_TMR1_CTRL 0x18
43 #define R_TIME 0x38
44 #define RW_WD_CTRL 0x40
45 #define R_WD_STAT 0x44
46 #define RW_INTR_MASK 0x48
47 #define RW_ACK_INTR 0x4c
48 #define R_INTR 0x50
49 #define R_MASKED_INTR 0x54
50
51 #define TYPE_ETRAX_FS_TIMER "etraxfs-timer"
52 typedef struct ETRAXTimerState ETRAXTimerState;
53 DECLARE_INSTANCE_CHECKER(ETRAXTimerState, ETRAX_TIMER,
54 TYPE_ETRAX_FS_TIMER)
55
56 struct ETRAXTimerState {
57 SysBusDevice parent_obj;
58
59 MemoryRegion mmio;
60 qemu_irq irq;
61 qemu_irq nmi;
62
63 ptimer_state *ptimer_t0;
64 ptimer_state *ptimer_t1;
65 ptimer_state *ptimer_wd;
66
67 int wd_hits;
68
69 /* Control registers. */
70 uint32_t rw_tmr0_div;
71 uint32_t r_tmr0_data;
72 uint32_t rw_tmr0_ctrl;
73
74 uint32_t rw_tmr1_div;
75 uint32_t r_tmr1_data;
76 uint32_t rw_tmr1_ctrl;
77
78 uint32_t rw_wd_ctrl;
79
80 uint32_t rw_intr_mask;
81 uint32_t rw_ack_intr;
82 uint32_t r_intr;
83 uint32_t r_masked_intr;
84 };
85
86 static uint64_t
87 timer_read(void *opaque, hwaddr addr, unsigned int size)
88 {
89 ETRAXTimerState *t = opaque;
90 uint32_t r = 0;
91
92 switch (addr) {
93 case R_TMR0_DATA:
94 r = ptimer_get_count(t->ptimer_t0);
95 break;
96 case R_TMR1_DATA:
97 r = ptimer_get_count(t->ptimer_t1);
98 break;
99 case R_TIME:
100 r = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) / 10;
101 break;
102 case RW_INTR_MASK:
103 r = t->rw_intr_mask;
104 break;
105 case R_MASKED_INTR:
106 r = t->r_intr & t->rw_intr_mask;
107 break;
108 default:
109 D(printf ("%s %x\n", __func__, addr));
110 break;
111 }
112 return r;
113 }
114
115 static void update_ctrl(ETRAXTimerState *t, int tnum)
116 {
117 unsigned int op;
118 unsigned int freq;
119 unsigned int freq_hz;
120 unsigned int div;
121 uint32_t ctrl;
122
123 ptimer_state *timer;
124
125 if (tnum == 0) {
126 ctrl = t->rw_tmr0_ctrl;
127 div = t->rw_tmr0_div;
128 timer = t->ptimer_t0;
129 } else {
130 ctrl = t->rw_tmr1_ctrl;
131 div = t->rw_tmr1_div;
132 timer = t->ptimer_t1;
133 }
134
135
136 op = ctrl & 3;
137 freq = ctrl >> 2;
138 freq_hz = 32000000;
139
140 switch (freq)
141 {
142 case 0:
143 case 1:
144 D(printf ("extern or disabled timer clock?\n"));
145 break;
146 case 4: freq_hz = 29493000; break;
147 case 5: freq_hz = 32000000; break;
148 case 6: freq_hz = 32768000; break;
149 case 7: freq_hz = 100000000; break;
150 default:
151 abort();
152 break;
153 }
154
155 D(printf ("freq_hz=%d div=%d\n", freq_hz, div));
156 ptimer_transaction_begin(timer);
157 ptimer_set_freq(timer, freq_hz);
158 ptimer_set_limit(timer, div, 0);
159
160 switch (op)
161 {
162 case 0:
163 /* Load. */
164 ptimer_set_limit(timer, div, 1);
165 break;
166 case 1:
167 /* Hold. */
168 ptimer_stop(timer);
169 break;
170 case 2:
171 /* Run. */
172 ptimer_run(timer, 0);
173 break;
174 default:
175 abort();
176 break;
177 }
178 ptimer_transaction_commit(timer);
179 }
180
181 static void timer_update_irq(ETRAXTimerState *t)
182 {
183 t->r_intr &= ~(t->rw_ack_intr);
184 t->r_masked_intr = t->r_intr & t->rw_intr_mask;
185
186 D(printf("%s: masked_intr=%x\n", __func__, t->r_masked_intr));
187 qemu_set_irq(t->irq, !!t->r_masked_intr);
188 }
189
190 static void timer0_hit(void *opaque)
191 {
192 ETRAXTimerState *t = opaque;
193 t->r_intr |= 1;
194 timer_update_irq(t);
195 }
196
197 static void timer1_hit(void *opaque)
198 {
199 ETRAXTimerState *t = opaque;
200 t->r_intr |= 2;
201 timer_update_irq(t);
202 }
203
204 static void watchdog_hit(void *opaque)
205 {
206 ETRAXTimerState *t = opaque;
207 if (t->wd_hits == 0) {
208 /* real hw gives a single tick before reseting but we are
209 a bit friendlier to compensate for our slower execution. */
210 ptimer_set_count(t->ptimer_wd, 10);
211 ptimer_run(t->ptimer_wd, 1);
212 qemu_irq_raise(t->nmi);
213 }
214 else
215 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
216
217 t->wd_hits++;
218 }
219
220 static inline void timer_watchdog_update(ETRAXTimerState *t, uint32_t value)
221 {
222 unsigned int wd_en = t->rw_wd_ctrl & (1 << 8);
223 unsigned int wd_key = t->rw_wd_ctrl >> 9;
224 unsigned int wd_cnt = t->rw_wd_ctrl & 511;
225 unsigned int new_key = value >> 9 & ((1 << 7) - 1);
226 unsigned int new_cmd = (value >> 8) & 1;
227
228 /* If the watchdog is enabled, they written key must match the
229 complement of the previous. */
230 wd_key = ~wd_key & ((1 << 7) - 1);
231
232 if (wd_en && wd_key != new_key)
233 return;
234
235 D(printf("en=%d new_key=%x oldkey=%x cmd=%d cnt=%d\n",
236 wd_en, new_key, wd_key, new_cmd, wd_cnt));
237
238 if (t->wd_hits)
239 qemu_irq_lower(t->nmi);
240
241 t->wd_hits = 0;
242
243 ptimer_transaction_begin(t->ptimer_wd);
244 ptimer_set_freq(t->ptimer_wd, 760);
245 if (wd_cnt == 0)
246 wd_cnt = 256;
247 ptimer_set_count(t->ptimer_wd, wd_cnt);
248 if (new_cmd)
249 ptimer_run(t->ptimer_wd, 1);
250 else
251 ptimer_stop(t->ptimer_wd);
252
253 t->rw_wd_ctrl = value;
254 ptimer_transaction_commit(t->ptimer_wd);
255 }
256
257 static void
258 timer_write(void *opaque, hwaddr addr,
259 uint64_t val64, unsigned int size)
260 {
261 ETRAXTimerState *t = opaque;
262 uint32_t value = val64;
263
264 switch (addr)
265 {
266 case RW_TMR0_DIV:
267 t->rw_tmr0_div = value;
268 break;
269 case RW_TMR0_CTRL:
270 D(printf ("RW_TMR0_CTRL=%x\n", value));
271 t->rw_tmr0_ctrl = value;
272 update_ctrl(t, 0);
273 break;
274 case RW_TMR1_DIV:
275 t->rw_tmr1_div = value;
276 break;
277 case RW_TMR1_CTRL:
278 D(printf ("RW_TMR1_CTRL=%x\n", value));
279 t->rw_tmr1_ctrl = value;
280 update_ctrl(t, 1);
281 break;
282 case RW_INTR_MASK:
283 D(printf ("RW_INTR_MASK=%x\n", value));
284 t->rw_intr_mask = value;
285 timer_update_irq(t);
286 break;
287 case RW_WD_CTRL:
288 timer_watchdog_update(t, value);
289 break;
290 case RW_ACK_INTR:
291 t->rw_ack_intr = value;
292 timer_update_irq(t);
293 t->rw_ack_intr = 0;
294 break;
295 default:
296 printf ("%s " TARGET_FMT_plx " %x\n",
297 __func__, addr, value);
298 break;
299 }
300 }
301
302 static const MemoryRegionOps timer_ops = {
303 .read = timer_read,
304 .write = timer_write,
305 .endianness = DEVICE_LITTLE_ENDIAN,
306 .valid = {
307 .min_access_size = 4,
308 .max_access_size = 4
309 }
310 };
311
312 static void etraxfs_timer_reset_enter(Object *obj, ResetType type)
313 {
314 ETRAXTimerState *t = ETRAX_TIMER(obj);
315
316 ptimer_transaction_begin(t->ptimer_t0);
317 ptimer_stop(t->ptimer_t0);
318 ptimer_transaction_commit(t->ptimer_t0);
319 ptimer_transaction_begin(t->ptimer_t1);
320 ptimer_stop(t->ptimer_t1);
321 ptimer_transaction_commit(t->ptimer_t1);
322 ptimer_transaction_begin(t->ptimer_wd);
323 ptimer_stop(t->ptimer_wd);
324 ptimer_transaction_commit(t->ptimer_wd);
325 t->rw_wd_ctrl = 0;
326 t->r_intr = 0;
327 t->rw_intr_mask = 0;
328 }
329
330 static void etraxfs_timer_reset_hold(Object *obj)
331 {
332 ETRAXTimerState *t = ETRAX_TIMER(obj);
333
334 qemu_irq_lower(t->irq);
335 }
336
337 static void etraxfs_timer_realize(DeviceState *dev, Error **errp)
338 {
339 ETRAXTimerState *t = ETRAX_TIMER(dev);
340 SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
341
342 t->ptimer_t0 = ptimer_init(timer0_hit, t, PTIMER_POLICY_DEFAULT);
343 t->ptimer_t1 = ptimer_init(timer1_hit, t, PTIMER_POLICY_DEFAULT);
344 t->ptimer_wd = ptimer_init(watchdog_hit, t, PTIMER_POLICY_DEFAULT);
345
346 sysbus_init_irq(sbd, &t->irq);
347 sysbus_init_irq(sbd, &t->nmi);
348
349 memory_region_init_io(&t->mmio, OBJECT(t), &timer_ops, t,
350 "etraxfs-timer", 0x5c);
351 sysbus_init_mmio(sbd, &t->mmio);
352 }
353
354 static void etraxfs_timer_class_init(ObjectClass *klass, void *data)
355 {
356 DeviceClass *dc = DEVICE_CLASS(klass);
357 ResettableClass *rc = RESETTABLE_CLASS(klass);
358
359 dc->realize = etraxfs_timer_realize;
360 rc->phases.enter = etraxfs_timer_reset_enter;
361 rc->phases.hold = etraxfs_timer_reset_hold;
362 }
363
364 static const TypeInfo etraxfs_timer_info = {
365 .name = TYPE_ETRAX_FS_TIMER,
366 .parent = TYPE_SYS_BUS_DEVICE,
367 .instance_size = sizeof(ETRAXTimerState),
368 .class_init = etraxfs_timer_class_init,
369 };
370
371 static void etraxfs_timer_register_types(void)
372 {
373 type_register_static(&etraxfs_timer_info);
374 }
375
376 type_init(etraxfs_timer_register_types)