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10#include "qemu/osdep.h"
11
12#include "qapi/error.h"
13#include "qemu/log.h"
14#include "qemu/module.h"
15#include "qemu/timer.h"
16#include "sysemu/watchdog.h"
17#include "hw/misc/aspeed_scu.h"
18#include "hw/qdev-properties.h"
19#include "hw/sysbus.h"
20#include "hw/watchdog/wdt_aspeed.h"
21#include "migration/vmstate.h"
22
23#define WDT_STATUS (0x00 / 4)
24#define WDT_RELOAD_VALUE (0x04 / 4)
25#define WDT_RESTART (0x08 / 4)
26#define WDT_CTRL (0x0C / 4)
27#define WDT_CTRL_RESET_MODE_SOC (0x00 << 5)
28#define WDT_CTRL_RESET_MODE_FULL_CHIP (0x01 << 5)
29#define WDT_CTRL_1MHZ_CLK BIT(4)
30#define WDT_CTRL_WDT_EXT BIT(3)
31#define WDT_CTRL_WDT_INTR BIT(2)
32#define WDT_CTRL_RESET_SYSTEM BIT(1)
33#define WDT_CTRL_ENABLE BIT(0)
34#define WDT_RESET_WIDTH (0x18 / 4)
35#define WDT_RESET_WIDTH_ACTIVE_HIGH BIT(31)
36#define WDT_POLARITY_MASK (0xFF << 24)
37#define WDT_ACTIVE_HIGH_MAGIC (0xA5 << 24)
38#define WDT_ACTIVE_LOW_MAGIC (0x5A << 24)
39#define WDT_RESET_WIDTH_PUSH_PULL BIT(30)
40#define WDT_DRIVE_TYPE_MASK (0xFF << 24)
41#define WDT_PUSH_PULL_MAGIC (0xA8 << 24)
42#define WDT_OPEN_DRAIN_MAGIC (0x8A << 24)
43#define WDT_RESET_MASK1 (0x1c / 4)
44
45#define WDT_TIMEOUT_STATUS (0x10 / 4)
46#define WDT_TIMEOUT_CLEAR (0x14 / 4)
47
48#define WDT_RESTART_MAGIC 0x4755
49
50#define AST2600_SCU_RESET_CONTROL1 (0x40 / 4)
51#define SCU_RESET_CONTROL1 (0x04 / 4)
52#define SCU_RESET_SDRAM BIT(0)
53
54static bool aspeed_wdt_is_enabled(const AspeedWDTState *s)
55{
56 return s->regs[WDT_CTRL] & WDT_CTRL_ENABLE;
57}
58
59static uint64_t aspeed_wdt_read(void *opaque, hwaddr offset, unsigned size)
60{
61 AspeedWDTState *s = ASPEED_WDT(opaque);
62
63 offset >>= 2;
64
65 switch (offset) {
66 case WDT_STATUS:
67 return s->regs[WDT_STATUS];
68 case WDT_RELOAD_VALUE:
69 return s->regs[WDT_RELOAD_VALUE];
70 case WDT_RESTART:
71 qemu_log_mask(LOG_GUEST_ERROR,
72 "%s: read from write-only reg at offset 0x%"
73 HWADDR_PRIx "\n", __func__, offset);
74 return 0;
75 case WDT_CTRL:
76 return s->regs[WDT_CTRL];
77 case WDT_RESET_WIDTH:
78 return s->regs[WDT_RESET_WIDTH];
79 case WDT_RESET_MASK1:
80 return s->regs[WDT_RESET_MASK1];
81 case WDT_TIMEOUT_STATUS:
82 case WDT_TIMEOUT_CLEAR:
83 qemu_log_mask(LOG_UNIMP,
84 "%s: uninmplemented read at offset 0x%" HWADDR_PRIx "\n",
85 __func__, offset);
86 return 0;
87 default:
88 qemu_log_mask(LOG_GUEST_ERROR,
89 "%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n",
90 __func__, offset);
91 return 0;
92 }
93
94}
95
96static void aspeed_wdt_reload(AspeedWDTState *s)
97{
98 uint64_t reload;
99
100 if (!(s->regs[WDT_CTRL] & WDT_CTRL_1MHZ_CLK)) {
101 reload = muldiv64(s->regs[WDT_RELOAD_VALUE], NANOSECONDS_PER_SECOND,
102 s->pclk_freq);
103 } else {
104 reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL;
105 }
106
107 if (aspeed_wdt_is_enabled(s)) {
108 timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload);
109 }
110}
111
112static void aspeed_wdt_reload_1mhz(AspeedWDTState *s)
113{
114 uint64_t reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL;
115
116 if (aspeed_wdt_is_enabled(s)) {
117 timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload);
118 }
119}
120
121
122static void aspeed_wdt_write(void *opaque, hwaddr offset, uint64_t data,
123 unsigned size)
124{
125 AspeedWDTState *s = ASPEED_WDT(opaque);
126 AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(s);
127 bool enable = data & WDT_CTRL_ENABLE;
128
129 offset >>= 2;
130
131 switch (offset) {
132 case WDT_STATUS:
133 qemu_log_mask(LOG_GUEST_ERROR,
134 "%s: write to read-only reg at offset 0x%"
135 HWADDR_PRIx "\n", __func__, offset);
136 break;
137 case WDT_RELOAD_VALUE:
138 s->regs[WDT_RELOAD_VALUE] = data;
139 break;
140 case WDT_RESTART:
141 if ((data & 0xFFFF) == WDT_RESTART_MAGIC) {
142 s->regs[WDT_STATUS] = s->regs[WDT_RELOAD_VALUE];
143 awc->wdt_reload(s);
144 }
145 break;
146 case WDT_CTRL:
147 if (enable && !aspeed_wdt_is_enabled(s)) {
148 s->regs[WDT_CTRL] = data;
149 awc->wdt_reload(s);
150 } else if (!enable && aspeed_wdt_is_enabled(s)) {
151 s->regs[WDT_CTRL] = data;
152 timer_del(s->timer);
153 }
154 break;
155 case WDT_RESET_WIDTH:
156 if (awc->reset_pulse) {
157 awc->reset_pulse(s, data & WDT_POLARITY_MASK);
158 }
159 s->regs[WDT_RESET_WIDTH] &= ~awc->ext_pulse_width_mask;
160 s->regs[WDT_RESET_WIDTH] |= data & awc->ext_pulse_width_mask;
161 break;
162
163 case WDT_RESET_MASK1:
164
165 s->regs[WDT_RESET_MASK1] = data;
166 break;
167
168 case WDT_TIMEOUT_STATUS:
169 case WDT_TIMEOUT_CLEAR:
170 qemu_log_mask(LOG_UNIMP,
171 "%s: uninmplemented write at offset 0x%" HWADDR_PRIx "\n",
172 __func__, offset);
173 break;
174 default:
175 qemu_log_mask(LOG_GUEST_ERROR,
176 "%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n",
177 __func__, offset);
178 }
179 return;
180}
181
182static WatchdogTimerModel model = {
183 .wdt_name = TYPE_ASPEED_WDT,
184 .wdt_description = "Aspeed watchdog device",
185};
186
187static const VMStateDescription vmstate_aspeed_wdt = {
188 .name = "vmstate_aspeed_wdt",
189 .version_id = 0,
190 .minimum_version_id = 0,
191 .fields = (VMStateField[]) {
192 VMSTATE_TIMER_PTR(timer, AspeedWDTState),
193 VMSTATE_UINT32_ARRAY(regs, AspeedWDTState, ASPEED_WDT_REGS_MAX),
194 VMSTATE_END_OF_LIST()
195 }
196};
197
198static const MemoryRegionOps aspeed_wdt_ops = {
199 .read = aspeed_wdt_read,
200 .write = aspeed_wdt_write,
201 .endianness = DEVICE_LITTLE_ENDIAN,
202 .valid.min_access_size = 4,
203 .valid.max_access_size = 4,
204 .valid.unaligned = false,
205};
206
207static void aspeed_wdt_reset(DeviceState *dev)
208{
209 AspeedWDTState *s = ASPEED_WDT(dev);
210
211 s->regs[WDT_STATUS] = 0x3EF1480;
212 s->regs[WDT_RELOAD_VALUE] = 0x03EF1480;
213 s->regs[WDT_RESTART] = 0;
214 s->regs[WDT_CTRL] = 0;
215 s->regs[WDT_RESET_WIDTH] = 0xFF;
216
217 timer_del(s->timer);
218}
219
220static void aspeed_wdt_timer_expired(void *dev)
221{
222 AspeedWDTState *s = ASPEED_WDT(dev);
223 uint32_t reset_ctrl_reg = ASPEED_WDT_GET_CLASS(s)->reset_ctrl_reg;
224
225
226 if (s->scu->regs[reset_ctrl_reg] & SCU_RESET_SDRAM) {
227 timer_del(s->timer);
228 s->regs[WDT_CTRL] = 0;
229 return;
230 }
231
232 qemu_log_mask(CPU_LOG_RESET, "Watchdog timer %" HWADDR_PRIx " expired.\n",
233 s->iomem.addr);
234 watchdog_perform_action();
235 timer_del(s->timer);
236}
237
238#define PCLK_HZ 24000000
239
240static void aspeed_wdt_realize(DeviceState *dev, Error **errp)
241{
242 SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
243 AspeedWDTState *s = ASPEED_WDT(dev);
244
245 assert(s->scu);
246
247 s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, aspeed_wdt_timer_expired, dev);
248
249
250
251
252 s->pclk_freq = PCLK_HZ;
253
254 memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_wdt_ops, s,
255 TYPE_ASPEED_WDT, ASPEED_WDT_REGS_MAX * 4);
256 sysbus_init_mmio(sbd, &s->iomem);
257}
258
259static Property aspeed_wdt_properties[] = {
260 DEFINE_PROP_LINK("scu", AspeedWDTState, scu, TYPE_ASPEED_SCU,
261 AspeedSCUState *),
262 DEFINE_PROP_END_OF_LIST(),
263};
264
265static void aspeed_wdt_class_init(ObjectClass *klass, void *data)
266{
267 DeviceClass *dc = DEVICE_CLASS(klass);
268
269 dc->desc = "ASPEED Watchdog Controller";
270 dc->realize = aspeed_wdt_realize;
271 dc->reset = aspeed_wdt_reset;
272 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
273 dc->vmsd = &vmstate_aspeed_wdt;
274 device_class_set_props(dc, aspeed_wdt_properties);
275}
276
277static const TypeInfo aspeed_wdt_info = {
278 .parent = TYPE_SYS_BUS_DEVICE,
279 .name = TYPE_ASPEED_WDT,
280 .instance_size = sizeof(AspeedWDTState),
281 .class_init = aspeed_wdt_class_init,
282 .class_size = sizeof(AspeedWDTClass),
283 .abstract = true,
284};
285
286static void aspeed_2400_wdt_class_init(ObjectClass *klass, void *data)
287{
288 DeviceClass *dc = DEVICE_CLASS(klass);
289 AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass);
290
291 dc->desc = "ASPEED 2400 Watchdog Controller";
292 awc->offset = 0x20;
293 awc->ext_pulse_width_mask = 0xff;
294 awc->reset_ctrl_reg = SCU_RESET_CONTROL1;
295 awc->wdt_reload = aspeed_wdt_reload;
296}
297
298static const TypeInfo aspeed_2400_wdt_info = {
299 .name = TYPE_ASPEED_2400_WDT,
300 .parent = TYPE_ASPEED_WDT,
301 .instance_size = sizeof(AspeedWDTState),
302 .class_init = aspeed_2400_wdt_class_init,
303};
304
305static void aspeed_2500_wdt_reset_pulse(AspeedWDTState *s, uint32_t property)
306{
307 if (property) {
308 if (property == WDT_ACTIVE_HIGH_MAGIC) {
309 s->regs[WDT_RESET_WIDTH] |= WDT_RESET_WIDTH_ACTIVE_HIGH;
310 } else if (property == WDT_ACTIVE_LOW_MAGIC) {
311 s->regs[WDT_RESET_WIDTH] &= ~WDT_RESET_WIDTH_ACTIVE_HIGH;
312 } else if (property == WDT_PUSH_PULL_MAGIC) {
313 s->regs[WDT_RESET_WIDTH] |= WDT_RESET_WIDTH_PUSH_PULL;
314 } else if (property == WDT_OPEN_DRAIN_MAGIC) {
315 s->regs[WDT_RESET_WIDTH] &= ~WDT_RESET_WIDTH_PUSH_PULL;
316 }
317 }
318}
319
320static void aspeed_2500_wdt_class_init(ObjectClass *klass, void *data)
321{
322 DeviceClass *dc = DEVICE_CLASS(klass);
323 AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass);
324
325 dc->desc = "ASPEED 2500 Watchdog Controller";
326 awc->offset = 0x20;
327 awc->ext_pulse_width_mask = 0xfffff;
328 awc->reset_ctrl_reg = SCU_RESET_CONTROL1;
329 awc->reset_pulse = aspeed_2500_wdt_reset_pulse;
330 awc->wdt_reload = aspeed_wdt_reload_1mhz;
331}
332
333static const TypeInfo aspeed_2500_wdt_info = {
334 .name = TYPE_ASPEED_2500_WDT,
335 .parent = TYPE_ASPEED_WDT,
336 .instance_size = sizeof(AspeedWDTState),
337 .class_init = aspeed_2500_wdt_class_init,
338};
339
340static void aspeed_2600_wdt_class_init(ObjectClass *klass, void *data)
341{
342 DeviceClass *dc = DEVICE_CLASS(klass);
343 AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass);
344
345 dc->desc = "ASPEED 2600 Watchdog Controller";
346 awc->offset = 0x40;
347 awc->ext_pulse_width_mask = 0xfffff;
348 awc->reset_ctrl_reg = AST2600_SCU_RESET_CONTROL1;
349 awc->reset_pulse = aspeed_2500_wdt_reset_pulse;
350 awc->wdt_reload = aspeed_wdt_reload_1mhz;
351}
352
353static const TypeInfo aspeed_2600_wdt_info = {
354 .name = TYPE_ASPEED_2600_WDT,
355 .parent = TYPE_ASPEED_WDT,
356 .instance_size = sizeof(AspeedWDTState),
357 .class_init = aspeed_2600_wdt_class_init,
358};
359
360static void wdt_aspeed_register_types(void)
361{
362 watchdog_add_model(&model);
363 type_register_static(&aspeed_wdt_info);
364 type_register_static(&aspeed_2400_wdt_info);
365 type_register_static(&aspeed_2500_wdt_info);
366 type_register_static(&aspeed_2600_wdt_info);
367}
368
369type_init(wdt_aspeed_register_types)
370
