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23#include "qemu/osdep.h"
24#include "qemu/log.h"
25#include "trace.h"
26#include "qapi/error.h"
27#include "qemu/module.h"
28#include "sysemu/watchdog.h"
29#include "hw/sysbus.h"
30#include "hw/irq.h"
31#include "hw/qdev-properties.h"
32#include "hw/registerfields.h"
33#include "hw/watchdog/cmsdk-apb-watchdog.h"
34#include "migration/vmstate.h"
35
36REG32(WDOGLOAD, 0x0)
37REG32(WDOGVALUE, 0x4)
38REG32(WDOGCONTROL, 0x8)
39 FIELD(WDOGCONTROL, INTEN, 0, 1)
40 FIELD(WDOGCONTROL, RESEN, 1, 1)
41#define R_WDOGCONTROL_VALID_MASK (R_WDOGCONTROL_INTEN_MASK | \
42 R_WDOGCONTROL_RESEN_MASK)
43REG32(WDOGINTCLR, 0xc)
44REG32(WDOGRIS, 0x10)
45 FIELD(WDOGRIS, INT, 0, 1)
46REG32(WDOGMIS, 0x14)
47REG32(WDOGTEST, 0x418)
48REG32(WDOGLOCK, 0xc00)
49#define WDOG_UNLOCK_VALUE 0x1ACCE551
50REG32(WDOGITCR, 0xf00)
51 FIELD(WDOGITCR, ENABLE, 0, 1)
52#define R_WDOGITCR_VALID_MASK R_WDOGITCR_ENABLE_MASK
53REG32(WDOGITOP, 0xf04)
54 FIELD(WDOGITOP, WDOGRES, 0, 1)
55 FIELD(WDOGITOP, WDOGINT, 1, 1)
56#define R_WDOGITOP_VALID_MASK (R_WDOGITOP_WDOGRES_MASK | \
57 R_WDOGITOP_WDOGINT_MASK)
58REG32(PID4, 0xfd0)
59REG32(PID5, 0xfd4)
60REG32(PID6, 0xfd8)
61REG32(PID7, 0xfdc)
62REG32(PID0, 0xfe0)
63REG32(PID1, 0xfe4)
64REG32(PID2, 0xfe8)
65REG32(PID3, 0xfec)
66REG32(CID0, 0xff0)
67REG32(CID1, 0xff4)
68REG32(CID2, 0xff8)
69REG32(CID3, 0xffc)
70
71
72static const uint32_t cmsdk_apb_watchdog_id[] = {
73 0x04, 0x00, 0x00, 0x00,
74 0x24, 0xb8, 0x1b, 0x00,
75 0x0d, 0xf0, 0x05, 0xb1,
76};
77
78static const uint32_t luminary_watchdog_id[] = {
79 0x00, 0x00, 0x00, 0x00,
80 0x05, 0x18, 0x18, 0x01,
81 0x0d, 0xf0, 0x05, 0xb1,
82};
83
84static bool cmsdk_apb_watchdog_intstatus(CMSDKAPBWatchdog *s)
85{
86
87 return s->intstatus && (s->control & R_WDOGCONTROL_INTEN_MASK);
88}
89
90static bool cmsdk_apb_watchdog_resetstatus(CMSDKAPBWatchdog *s)
91{
92
93 return s->resetstatus && (s->control & R_WDOGCONTROL_RESEN_MASK);
94}
95
96static void cmsdk_apb_watchdog_update(CMSDKAPBWatchdog *s)
97{
98 bool wdogint;
99 bool wdogres;
100
101 if (s->itcr) {
102
103
104
105
106 wdogint = s->itop & R_WDOGITOP_WDOGINT_MASK;
107 wdogres = s->itop & R_WDOGITOP_WDOGRES_MASK;
108 } else {
109 wdogint = cmsdk_apb_watchdog_intstatus(s);
110 wdogres = cmsdk_apb_watchdog_resetstatus(s);
111 }
112
113 qemu_set_irq(s->wdogint, wdogint);
114 if (wdogres) {
115 watchdog_perform_action();
116 }
117}
118
119static uint64_t cmsdk_apb_watchdog_read(void *opaque, hwaddr offset,
120 unsigned size)
121{
122 CMSDKAPBWatchdog *s = CMSDK_APB_WATCHDOG(opaque);
123 uint64_t r;
124
125 switch (offset) {
126 case A_WDOGLOAD:
127 r = ptimer_get_limit(s->timer);
128 break;
129 case A_WDOGVALUE:
130 r = ptimer_get_count(s->timer);
131 break;
132 case A_WDOGCONTROL:
133 r = s->control;
134 break;
135 case A_WDOGRIS:
136 r = s->intstatus;
137 break;
138 case A_WDOGMIS:
139 r = cmsdk_apb_watchdog_intstatus(s);
140 break;
141 case A_WDOGLOCK:
142 r = s->lock;
143 break;
144 case A_WDOGITCR:
145 if (s->is_luminary) {
146 goto bad_offset;
147 }
148 r = s->itcr;
149 break;
150 case A_PID4 ... A_CID3:
151 r = s->id[(offset - A_PID4) / 4];
152 break;
153 case A_WDOGINTCLR:
154 case A_WDOGITOP:
155 if (s->is_luminary) {
156 goto bad_offset;
157 }
158 qemu_log_mask(LOG_GUEST_ERROR,
159 "CMSDK APB watchdog read: read of WO offset %x\n",
160 (int)offset);
161 r = 0;
162 break;
163 case A_WDOGTEST:
164 if (!s->is_luminary) {
165 goto bad_offset;
166 }
167 qemu_log_mask(LOG_UNIMP,
168 "Luminary watchdog read: stall not implemented\n");
169 r = 0;
170 break;
171 default:
172bad_offset:
173 qemu_log_mask(LOG_GUEST_ERROR,
174 "CMSDK APB watchdog read: bad offset %x\n", (int)offset);
175 r = 0;
176 break;
177 }
178 trace_cmsdk_apb_watchdog_read(offset, r, size);
179 return r;
180}
181
182static void cmsdk_apb_watchdog_write(void *opaque, hwaddr offset,
183 uint64_t value, unsigned size)
184{
185 CMSDKAPBWatchdog *s = CMSDK_APB_WATCHDOG(opaque);
186
187 trace_cmsdk_apb_watchdog_write(offset, value, size);
188
189 if (s->lock && offset != A_WDOGLOCK) {
190
191 qemu_log_mask(LOG_GUEST_ERROR,
192 "CMSDK APB watchdog write: write to locked watchdog\n");
193 return;
194 }
195
196 switch (offset) {
197 case A_WDOGLOAD:
198
199
200
201
202 ptimer_transaction_begin(s->timer);
203 ptimer_set_limit(s->timer, value, 1);
204 ptimer_run(s->timer, 0);
205 ptimer_transaction_commit(s->timer);
206 break;
207 case A_WDOGCONTROL:
208 if (s->is_luminary && 0 != (R_WDOGCONTROL_INTEN_MASK & s->control)) {
209
210
211
212
213
214 break;
215 }
216 s->control = value & R_WDOGCONTROL_VALID_MASK;
217 cmsdk_apb_watchdog_update(s);
218 break;
219 case A_WDOGINTCLR:
220 s->intstatus = 0;
221 ptimer_transaction_begin(s->timer);
222 ptimer_set_count(s->timer, ptimer_get_limit(s->timer));
223 ptimer_transaction_commit(s->timer);
224 cmsdk_apb_watchdog_update(s);
225 break;
226 case A_WDOGLOCK:
227 s->lock = (value != WDOG_UNLOCK_VALUE);
228 break;
229 case A_WDOGITCR:
230 if (s->is_luminary) {
231 goto bad_offset;
232 }
233 s->itcr = value & R_WDOGITCR_VALID_MASK;
234 cmsdk_apb_watchdog_update(s);
235 break;
236 case A_WDOGITOP:
237 if (s->is_luminary) {
238 goto bad_offset;
239 }
240 s->itop = value & R_WDOGITOP_VALID_MASK;
241 cmsdk_apb_watchdog_update(s);
242 break;
243 case A_WDOGVALUE:
244 case A_WDOGRIS:
245 case A_WDOGMIS:
246 case A_PID4 ... A_CID3:
247 qemu_log_mask(LOG_GUEST_ERROR,
248 "CMSDK APB watchdog write: write to RO offset 0x%x\n",
249 (int)offset);
250 break;
251 case A_WDOGTEST:
252 if (!s->is_luminary) {
253 goto bad_offset;
254 }
255 qemu_log_mask(LOG_UNIMP,
256 "Luminary watchdog write: stall not implemented\n");
257 break;
258 default:
259bad_offset:
260 qemu_log_mask(LOG_GUEST_ERROR,
261 "CMSDK APB watchdog write: bad offset 0x%x\n",
262 (int)offset);
263 break;
264 }
265}
266
267static const MemoryRegionOps cmsdk_apb_watchdog_ops = {
268 .read = cmsdk_apb_watchdog_read,
269 .write = cmsdk_apb_watchdog_write,
270 .endianness = DEVICE_LITTLE_ENDIAN,
271
272 .impl.min_access_size = 4,
273 .impl.max_access_size = 4,
274 .valid.min_access_size = 1,
275 .valid.max_access_size = 4,
276};
277
278static void cmsdk_apb_watchdog_tick(void *opaque)
279{
280 CMSDKAPBWatchdog *s = CMSDK_APB_WATCHDOG(opaque);
281
282 if (!s->intstatus) {
283
284 s->intstatus = R_WDOGRIS_INT_MASK;
285 } else {
286
287 s->resetstatus = 1;
288 ptimer_stop(s->timer);
289 }
290 cmsdk_apb_watchdog_update(s);
291}
292
293static void cmsdk_apb_watchdog_reset(DeviceState *dev)
294{
295 CMSDKAPBWatchdog *s = CMSDK_APB_WATCHDOG(dev);
296
297 trace_cmsdk_apb_watchdog_reset();
298 s->control = 0;
299 s->intstatus = 0;
300 s->lock = 0;
301 s->itcr = 0;
302 s->itop = 0;
303 s->resetstatus = 0;
304
305 ptimer_transaction_begin(s->timer);
306 ptimer_set_limit(s->timer, 0xffffffff, 1);
307 ptimer_run(s->timer, 0);
308 ptimer_transaction_commit(s->timer);
309}
310
311static void cmsdk_apb_watchdog_init(Object *obj)
312{
313 SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
314 CMSDKAPBWatchdog *s = CMSDK_APB_WATCHDOG(obj);
315
316 memory_region_init_io(&s->iomem, obj, &cmsdk_apb_watchdog_ops,
317 s, "cmsdk-apb-watchdog", 0x1000);
318 sysbus_init_mmio(sbd, &s->iomem);
319 sysbus_init_irq(sbd, &s->wdogint);
320
321 s->is_luminary = false;
322 s->id = cmsdk_apb_watchdog_id;
323}
324
325static void cmsdk_apb_watchdog_realize(DeviceState *dev, Error **errp)
326{
327 CMSDKAPBWatchdog *s = CMSDK_APB_WATCHDOG(dev);
328
329 if (s->wdogclk_frq == 0) {
330 error_setg(errp,
331 "CMSDK APB watchdog: wdogclk-frq property must be set");
332 return;
333 }
334
335 s->timer = ptimer_init(cmsdk_apb_watchdog_tick, s,
336 PTIMER_POLICY_WRAP_AFTER_ONE_PERIOD |
337 PTIMER_POLICY_TRIGGER_ONLY_ON_DECREMENT |
338 PTIMER_POLICY_NO_IMMEDIATE_RELOAD |
339 PTIMER_POLICY_NO_COUNTER_ROUND_DOWN);
340
341 ptimer_transaction_begin(s->timer);
342 ptimer_set_freq(s->timer, s->wdogclk_frq);
343 ptimer_transaction_commit(s->timer);
344}
345
346static const VMStateDescription cmsdk_apb_watchdog_vmstate = {
347 .name = "cmsdk-apb-watchdog",
348 .version_id = 1,
349 .minimum_version_id = 1,
350 .fields = (VMStateField[]) {
351 VMSTATE_PTIMER(timer, CMSDKAPBWatchdog),
352 VMSTATE_UINT32(control, CMSDKAPBWatchdog),
353 VMSTATE_UINT32(intstatus, CMSDKAPBWatchdog),
354 VMSTATE_UINT32(lock, CMSDKAPBWatchdog),
355 VMSTATE_UINT32(itcr, CMSDKAPBWatchdog),
356 VMSTATE_UINT32(itop, CMSDKAPBWatchdog),
357 VMSTATE_UINT32(resetstatus, CMSDKAPBWatchdog),
358 VMSTATE_END_OF_LIST()
359 }
360};
361
362static Property cmsdk_apb_watchdog_properties[] = {
363 DEFINE_PROP_UINT32("wdogclk-frq", CMSDKAPBWatchdog, wdogclk_frq, 0),
364 DEFINE_PROP_END_OF_LIST(),
365};
366
367static void cmsdk_apb_watchdog_class_init(ObjectClass *klass, void *data)
368{
369 DeviceClass *dc = DEVICE_CLASS(klass);
370
371 dc->realize = cmsdk_apb_watchdog_realize;
372 dc->vmsd = &cmsdk_apb_watchdog_vmstate;
373 dc->reset = cmsdk_apb_watchdog_reset;
374 dc->props = cmsdk_apb_watchdog_properties;
375}
376
377static const TypeInfo cmsdk_apb_watchdog_info = {
378 .name = TYPE_CMSDK_APB_WATCHDOG,
379 .parent = TYPE_SYS_BUS_DEVICE,
380 .instance_size = sizeof(CMSDKAPBWatchdog),
381 .instance_init = cmsdk_apb_watchdog_init,
382 .class_init = cmsdk_apb_watchdog_class_init,
383};
384
385static void luminary_watchdog_init(Object *obj)
386{
387 CMSDKAPBWatchdog *s = CMSDK_APB_WATCHDOG(obj);
388
389 s->is_luminary = true;
390 s->id = luminary_watchdog_id;
391}
392
393static const TypeInfo luminary_watchdog_info = {
394 .name = TYPE_LUMINARY_WATCHDOG,
395 .parent = TYPE_CMSDK_APB_WATCHDOG,
396 .instance_init = luminary_watchdog_init
397};
398
399static void cmsdk_apb_watchdog_register_types(void)
400{
401 type_register_static(&cmsdk_apb_watchdog_info);
402 type_register_static(&luminary_watchdog_info);
403}
404
405type_init(cmsdk_apb_watchdog_register_types);
406
