]>
Commit | Line | Data |
---|---|---|
854123bf CLG |
1 | /* |
2 | * ASPEED Watchdog Controller | |
3 | * | |
4 | * Copyright (C) 2016-2017 IBM Corp. | |
5 | * | |
6 | * This code is licensed under the GPL version 2 or later. See the | |
7 | * COPYING file in the top-level directory. | |
8 | */ | |
9 | ||
10 | #include "qemu/osdep.h" | |
f55d613b AJ |
11 | |
12 | #include "qapi/error.h" | |
854123bf | 13 | #include "qemu/log.h" |
0b8fa32f | 14 | #include "qemu/module.h" |
f55d613b | 15 | #include "qemu/timer.h" |
854123bf | 16 | #include "sysemu/watchdog.h" |
f55d613b | 17 | #include "hw/misc/aspeed_scu.h" |
a27bd6c7 | 18 | #include "hw/qdev-properties.h" |
854123bf | 19 | #include "hw/sysbus.h" |
854123bf | 20 | #include "hw/watchdog/wdt_aspeed.h" |
d6454270 | 21 | #include "migration/vmstate.h" |
854123bf | 22 | |
f55d613b AJ |
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) | |
854123bf CLG |
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) | |
f55d613b AJ |
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) | |
6b2b2a70 | 43 | #define WDT_RESET_MASK1 (0x1c / 4) |
854123bf | 44 | |
f55d613b AJ |
45 | #define WDT_TIMEOUT_STATUS (0x10 / 4) |
46 | #define WDT_TIMEOUT_CLEAR (0x14 / 4) | |
854123bf | 47 | |
f55d613b | 48 | #define WDT_RESTART_MAGIC 0x4755 |
854123bf | 49 | |
6b2b2a70 | 50 | #define AST2600_SCU_RESET_CONTROL1 (0x40 / 4) |
3059c2f5 JS |
51 | #define SCU_RESET_CONTROL1 (0x04 / 4) |
52 | #define SCU_RESET_SDRAM BIT(0) | |
53 | ||
854123bf CLG |
54 | static bool aspeed_wdt_is_enabled(const AspeedWDTState *s) |
55 | { | |
56 | return s->regs[WDT_CTRL] & WDT_CTRL_ENABLE; | |
57 | } | |
58 | ||
59 | static 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]; | |
f55d613b AJ |
77 | case WDT_RESET_WIDTH: |
78 | return s->regs[WDT_RESET_WIDTH]; | |
6b2b2a70 JS |
79 | case WDT_RESET_MASK1: |
80 | return s->regs[WDT_RESET_MASK1]; | |
854123bf CLG |
81 | case WDT_TIMEOUT_STATUS: |
82 | case WDT_TIMEOUT_CLEAR: | |
854123bf CLG |
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 | ||
28c80f15 | 96 | static void aspeed_wdt_reload(AspeedWDTState *s) |
854123bf | 97 | { |
f958537a | 98 | uint64_t reload; |
854123bf | 99 | |
28c80f15 | 100 | if (!(s->regs[WDT_CTRL] & WDT_CTRL_1MHZ_CLK)) { |
854123bf CLG |
101 | reload = muldiv64(s->regs[WDT_RELOAD_VALUE], NANOSECONDS_PER_SECOND, |
102 | s->pclk_freq); | |
103 | } else { | |
f958537a | 104 | reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL; |
854123bf CLG |
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 | ||
28c80f15 JS |
112 | static 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 | ||
854123bf CLG |
122 | static void aspeed_wdt_write(void *opaque, hwaddr offset, uint64_t data, |
123 | unsigned size) | |
124 | { | |
125 | AspeedWDTState *s = ASPEED_WDT(opaque); | |
6112bd6d | 126 | AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(s); |
854123bf CLG |
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]; | |
28c80f15 | 143 | awc->wdt_reload(s); |
854123bf CLG |
144 | } |
145 | break; | |
146 | case WDT_CTRL: | |
147 | if (enable && !aspeed_wdt_is_enabled(s)) { | |
148 | s->regs[WDT_CTRL] = data; | |
28c80f15 | 149 | awc->wdt_reload(s); |
854123bf CLG |
150 | } else if (!enable && aspeed_wdt_is_enabled(s)) { |
151 | s->regs[WDT_CTRL] = data; | |
152 | timer_del(s->timer); | |
153 | } | |
154 | break; | |
f55d613b | 155 | case WDT_RESET_WIDTH: |
6112bd6d CLG |
156 | if (awc->reset_pulse) { |
157 | awc->reset_pulse(s, data & WDT_POLARITY_MASK); | |
f55d613b | 158 | } |
6112bd6d CLG |
159 | s->regs[WDT_RESET_WIDTH] &= ~awc->ext_pulse_width_mask; |
160 | s->regs[WDT_RESET_WIDTH] |= data & awc->ext_pulse_width_mask; | |
f55d613b | 161 | break; |
6112bd6d | 162 | |
6b2b2a70 JS |
163 | case WDT_RESET_MASK1: |
164 | /* TODO: implement */ | |
165 | s->regs[WDT_RESET_MASK1] = data; | |
166 | break; | |
167 | ||
854123bf CLG |
168 | case WDT_TIMEOUT_STATUS: |
169 | case WDT_TIMEOUT_CLEAR: | |
854123bf CLG |
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 | ||
182 | static WatchdogTimerModel model = { | |
183 | .wdt_name = TYPE_ASPEED_WDT, | |
184 | .wdt_description = "Aspeed watchdog device", | |
185 | }; | |
186 | ||
187 | static 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 | ||
198 | static 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 | ||
207 | static 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; | |
f55d613b | 215 | s->regs[WDT_RESET_WIDTH] = 0xFF; |
854123bf CLG |
216 | |
217 | timer_del(s->timer); | |
218 | } | |
219 | ||
220 | static void aspeed_wdt_timer_expired(void *dev) | |
221 | { | |
222 | AspeedWDTState *s = ASPEED_WDT(dev); | |
6112bd6d | 223 | uint32_t reset_ctrl_reg = ASPEED_WDT_GET_CLASS(s)->reset_ctrl_reg; |
854123bf | 224 | |
3059c2f5 | 225 | /* Do not reset on SDRAM controller reset */ |
6112bd6d | 226 | if (s->scu->regs[reset_ctrl_reg] & SCU_RESET_SDRAM) { |
3059c2f5 JS |
227 | timer_del(s->timer); |
228 | s->regs[WDT_CTRL] = 0; | |
229 | return; | |
230 | } | |
231 | ||
aabf1de4 JS |
232 | qemu_log_mask(CPU_LOG_RESET, "Watchdog timer %" HWADDR_PRIx " expired.\n", |
233 | s->iomem.addr); | |
854123bf CLG |
234 | watchdog_perform_action(); |
235 | timer_del(s->timer); | |
236 | } | |
237 | ||
238 | #define PCLK_HZ 24000000 | |
239 | ||
240 | static void aspeed_wdt_realize(DeviceState *dev, Error **errp) | |
241 | { | |
242 | SysBusDevice *sbd = SYS_BUS_DEVICE(dev); | |
243 | AspeedWDTState *s = ASPEED_WDT(dev); | |
3059c2f5 | 244 | |
2ec11f23 | 245 | assert(s->scu); |
854123bf CLG |
246 | |
247 | s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, aspeed_wdt_timer_expired, dev); | |
248 | ||
249 | /* FIXME: This setting should be derived from the SCU hw strapping | |
250 | * register SCU70 | |
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 | ||
2ec11f23 CLG |
259 | static Property aspeed_wdt_properties[] = { |
260 | DEFINE_PROP_LINK("scu", AspeedWDTState, scu, TYPE_ASPEED_SCU, | |
261 | AspeedSCUState *), | |
262 | DEFINE_PROP_END_OF_LIST(), | |
263 | }; | |
264 | ||
854123bf CLG |
265 | static void aspeed_wdt_class_init(ObjectClass *klass, void *data) |
266 | { | |
267 | DeviceClass *dc = DEVICE_CLASS(klass); | |
268 | ||
6112bd6d | 269 | dc->desc = "ASPEED Watchdog Controller"; |
854123bf CLG |
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; | |
2ec11f23 | 274 | dc->props = aspeed_wdt_properties; |
854123bf CLG |
275 | } |
276 | ||
277 | static 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, | |
6112bd6d CLG |
282 | .class_size = sizeof(AspeedWDTClass), |
283 | .abstract = true, | |
284 | }; | |
285 | ||
286 | static 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; | |
28c80f15 | 295 | awc->wdt_reload = aspeed_wdt_reload; |
6112bd6d CLG |
296 | } |
297 | ||
298 | static 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 | ||
305 | static 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 | ||
320 | static 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; | |
28c80f15 | 330 | awc->wdt_reload = aspeed_wdt_reload_1mhz; |
6112bd6d CLG |
331 | } |
332 | ||
333 | static 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, | |
854123bf CLG |
338 | }; |
339 | ||
6b2b2a70 JS |
340 | static 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; /* TODO */ | |
348 | awc->reset_ctrl_reg = AST2600_SCU_RESET_CONTROL1; | |
349 | awc->reset_pulse = aspeed_2500_wdt_reset_pulse; | |
28c80f15 | 350 | awc->wdt_reload = aspeed_wdt_reload_1mhz; |
6b2b2a70 JS |
351 | } |
352 | ||
353 | static 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 | ||
854123bf CLG |
360 | static void wdt_aspeed_register_types(void) |
361 | { | |
362 | watchdog_add_model(&model); | |
363 | type_register_static(&aspeed_wdt_info); | |
6112bd6d CLG |
364 | type_register_static(&aspeed_2400_wdt_info); |
365 | type_register_static(&aspeed_2500_wdt_info); | |
6b2b2a70 | 366 | type_register_static(&aspeed_2600_wdt_info); |
854123bf CLG |
367 | } |
368 | ||
369 | type_init(wdt_aspeed_register_types) |