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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" |
a8eb9a43 | 22 | #include "trace.h" |
854123bf | 23 | |
f55d613b AJ |
24 | #define WDT_STATUS (0x00 / 4) |
25 | #define WDT_RELOAD_VALUE (0x04 / 4) | |
26 | #define WDT_RESTART (0x08 / 4) | |
27 | #define WDT_CTRL (0x0C / 4) | |
854123bf CLG |
28 | #define WDT_CTRL_RESET_MODE_SOC (0x00 << 5) |
29 | #define WDT_CTRL_RESET_MODE_FULL_CHIP (0x01 << 5) | |
30 | #define WDT_CTRL_1MHZ_CLK BIT(4) | |
31 | #define WDT_CTRL_WDT_EXT BIT(3) | |
32 | #define WDT_CTRL_WDT_INTR BIT(2) | |
33 | #define WDT_CTRL_RESET_SYSTEM BIT(1) | |
34 | #define WDT_CTRL_ENABLE BIT(0) | |
f55d613b AJ |
35 | #define WDT_RESET_WIDTH (0x18 / 4) |
36 | #define WDT_RESET_WIDTH_ACTIVE_HIGH BIT(31) | |
37 | #define WDT_POLARITY_MASK (0xFF << 24) | |
38 | #define WDT_ACTIVE_HIGH_MAGIC (0xA5 << 24) | |
39 | #define WDT_ACTIVE_LOW_MAGIC (0x5A << 24) | |
40 | #define WDT_RESET_WIDTH_PUSH_PULL BIT(30) | |
41 | #define WDT_DRIVE_TYPE_MASK (0xFF << 24) | |
42 | #define WDT_PUSH_PULL_MAGIC (0xA8 << 24) | |
43 | #define WDT_OPEN_DRAIN_MAGIC (0x8A << 24) | |
6b2b2a70 | 44 | #define WDT_RESET_MASK1 (0x1c / 4) |
854123bf | 45 | |
f55d613b AJ |
46 | #define WDT_TIMEOUT_STATUS (0x10 / 4) |
47 | #define WDT_TIMEOUT_CLEAR (0x14 / 4) | |
854123bf | 48 | |
f55d613b | 49 | #define WDT_RESTART_MAGIC 0x4755 |
854123bf | 50 | |
6b2b2a70 | 51 | #define AST2600_SCU_RESET_CONTROL1 (0x40 / 4) |
3059c2f5 JS |
52 | #define SCU_RESET_CONTROL1 (0x04 / 4) |
53 | #define SCU_RESET_SDRAM BIT(0) | |
54 | ||
854123bf CLG |
55 | static bool aspeed_wdt_is_enabled(const AspeedWDTState *s) |
56 | { | |
57 | return s->regs[WDT_CTRL] & WDT_CTRL_ENABLE; | |
58 | } | |
59 | ||
60 | static uint64_t aspeed_wdt_read(void *opaque, hwaddr offset, unsigned size) | |
61 | { | |
62 | AspeedWDTState *s = ASPEED_WDT(opaque); | |
63 | ||
a8eb9a43 CLG |
64 | trace_aspeed_wdt_read(offset, size); |
65 | ||
854123bf CLG |
66 | offset >>= 2; |
67 | ||
68 | switch (offset) { | |
69 | case WDT_STATUS: | |
70 | return s->regs[WDT_STATUS]; | |
71 | case WDT_RELOAD_VALUE: | |
72 | return s->regs[WDT_RELOAD_VALUE]; | |
73 | case WDT_RESTART: | |
74 | qemu_log_mask(LOG_GUEST_ERROR, | |
75 | "%s: read from write-only reg at offset 0x%" | |
76 | HWADDR_PRIx "\n", __func__, offset); | |
77 | return 0; | |
78 | case WDT_CTRL: | |
79 | return s->regs[WDT_CTRL]; | |
f55d613b AJ |
80 | case WDT_RESET_WIDTH: |
81 | return s->regs[WDT_RESET_WIDTH]; | |
6b2b2a70 JS |
82 | case WDT_RESET_MASK1: |
83 | return s->regs[WDT_RESET_MASK1]; | |
854123bf CLG |
84 | case WDT_TIMEOUT_STATUS: |
85 | case WDT_TIMEOUT_CLEAR: | |
854123bf CLG |
86 | qemu_log_mask(LOG_UNIMP, |
87 | "%s: uninmplemented read at offset 0x%" HWADDR_PRIx "\n", | |
88 | __func__, offset); | |
89 | return 0; | |
90 | default: | |
91 | qemu_log_mask(LOG_GUEST_ERROR, | |
92 | "%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n", | |
93 | __func__, offset); | |
94 | return 0; | |
95 | } | |
96 | ||
97 | } | |
98 | ||
28c80f15 | 99 | static void aspeed_wdt_reload(AspeedWDTState *s) |
854123bf | 100 | { |
f958537a | 101 | uint64_t reload; |
854123bf | 102 | |
28c80f15 | 103 | if (!(s->regs[WDT_CTRL] & WDT_CTRL_1MHZ_CLK)) { |
854123bf CLG |
104 | reload = muldiv64(s->regs[WDT_RELOAD_VALUE], NANOSECONDS_PER_SECOND, |
105 | s->pclk_freq); | |
106 | } else { | |
f958537a | 107 | reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL; |
854123bf CLG |
108 | } |
109 | ||
110 | if (aspeed_wdt_is_enabled(s)) { | |
111 | timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload); | |
112 | } | |
113 | } | |
114 | ||
28c80f15 JS |
115 | static void aspeed_wdt_reload_1mhz(AspeedWDTState *s) |
116 | { | |
117 | uint64_t reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL; | |
118 | ||
119 | if (aspeed_wdt_is_enabled(s)) { | |
120 | timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload); | |
121 | } | |
122 | } | |
123 | ||
709098fd AJ |
124 | static uint64_t aspeed_2400_sanitize_ctrl(uint64_t data) |
125 | { | |
126 | return data & 0xffff; | |
127 | } | |
128 | ||
129 | static uint64_t aspeed_2500_sanitize_ctrl(uint64_t data) | |
130 | { | |
131 | return (data & ~(0xfUL << 8)) | WDT_CTRL_1MHZ_CLK; | |
132 | } | |
133 | ||
134 | static uint64_t aspeed_2600_sanitize_ctrl(uint64_t data) | |
135 | { | |
136 | return data & ~(0x7UL << 7); | |
137 | } | |
28c80f15 | 138 | |
854123bf CLG |
139 | static void aspeed_wdt_write(void *opaque, hwaddr offset, uint64_t data, |
140 | unsigned size) | |
141 | { | |
142 | AspeedWDTState *s = ASPEED_WDT(opaque); | |
6112bd6d | 143 | AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(s); |
709098fd | 144 | bool enable; |
854123bf | 145 | |
a8eb9a43 CLG |
146 | trace_aspeed_wdt_write(offset, size, data); |
147 | ||
854123bf CLG |
148 | offset >>= 2; |
149 | ||
150 | switch (offset) { | |
151 | case WDT_STATUS: | |
152 | qemu_log_mask(LOG_GUEST_ERROR, | |
153 | "%s: write to read-only reg at offset 0x%" | |
154 | HWADDR_PRIx "\n", __func__, offset); | |
155 | break; | |
156 | case WDT_RELOAD_VALUE: | |
157 | s->regs[WDT_RELOAD_VALUE] = data; | |
158 | break; | |
159 | case WDT_RESTART: | |
160 | if ((data & 0xFFFF) == WDT_RESTART_MAGIC) { | |
161 | s->regs[WDT_STATUS] = s->regs[WDT_RELOAD_VALUE]; | |
28c80f15 | 162 | awc->wdt_reload(s); |
854123bf CLG |
163 | } |
164 | break; | |
165 | case WDT_CTRL: | |
709098fd AJ |
166 | data = awc->sanitize_ctrl(data); |
167 | enable = data & WDT_CTRL_ENABLE; | |
854123bf CLG |
168 | if (enable && !aspeed_wdt_is_enabled(s)) { |
169 | s->regs[WDT_CTRL] = data; | |
28c80f15 | 170 | awc->wdt_reload(s); |
854123bf CLG |
171 | } else if (!enable && aspeed_wdt_is_enabled(s)) { |
172 | s->regs[WDT_CTRL] = data; | |
173 | timer_del(s->timer); | |
74b67e1f AJ |
174 | } else { |
175 | s->regs[WDT_CTRL] = data; | |
854123bf CLG |
176 | } |
177 | break; | |
f55d613b | 178 | case WDT_RESET_WIDTH: |
6112bd6d CLG |
179 | if (awc->reset_pulse) { |
180 | awc->reset_pulse(s, data & WDT_POLARITY_MASK); | |
f55d613b | 181 | } |
6112bd6d CLG |
182 | s->regs[WDT_RESET_WIDTH] &= ~awc->ext_pulse_width_mask; |
183 | s->regs[WDT_RESET_WIDTH] |= data & awc->ext_pulse_width_mask; | |
f55d613b | 184 | break; |
6112bd6d | 185 | |
6b2b2a70 JS |
186 | case WDT_RESET_MASK1: |
187 | /* TODO: implement */ | |
188 | s->regs[WDT_RESET_MASK1] = data; | |
189 | break; | |
190 | ||
854123bf CLG |
191 | case WDT_TIMEOUT_STATUS: |
192 | case WDT_TIMEOUT_CLEAR: | |
854123bf CLG |
193 | qemu_log_mask(LOG_UNIMP, |
194 | "%s: uninmplemented write at offset 0x%" HWADDR_PRIx "\n", | |
195 | __func__, offset); | |
196 | break; | |
197 | default: | |
198 | qemu_log_mask(LOG_GUEST_ERROR, | |
199 | "%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n", | |
200 | __func__, offset); | |
201 | } | |
202 | return; | |
203 | } | |
204 | ||
205 | static WatchdogTimerModel model = { | |
206 | .wdt_name = TYPE_ASPEED_WDT, | |
207 | .wdt_description = "Aspeed watchdog device", | |
208 | }; | |
209 | ||
210 | static const VMStateDescription vmstate_aspeed_wdt = { | |
211 | .name = "vmstate_aspeed_wdt", | |
212 | .version_id = 0, | |
213 | .minimum_version_id = 0, | |
214 | .fields = (VMStateField[]) { | |
215 | VMSTATE_TIMER_PTR(timer, AspeedWDTState), | |
216 | VMSTATE_UINT32_ARRAY(regs, AspeedWDTState, ASPEED_WDT_REGS_MAX), | |
217 | VMSTATE_END_OF_LIST() | |
218 | } | |
219 | }; | |
220 | ||
221 | static const MemoryRegionOps aspeed_wdt_ops = { | |
222 | .read = aspeed_wdt_read, | |
223 | .write = aspeed_wdt_write, | |
224 | .endianness = DEVICE_LITTLE_ENDIAN, | |
225 | .valid.min_access_size = 4, | |
226 | .valid.max_access_size = 4, | |
227 | .valid.unaligned = false, | |
228 | }; | |
229 | ||
230 | static void aspeed_wdt_reset(DeviceState *dev) | |
231 | { | |
232 | AspeedWDTState *s = ASPEED_WDT(dev); | |
709098fd | 233 | AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(s); |
854123bf CLG |
234 | |
235 | s->regs[WDT_STATUS] = 0x3EF1480; | |
236 | s->regs[WDT_RELOAD_VALUE] = 0x03EF1480; | |
237 | s->regs[WDT_RESTART] = 0; | |
709098fd | 238 | s->regs[WDT_CTRL] = awc->sanitize_ctrl(0); |
f55d613b | 239 | s->regs[WDT_RESET_WIDTH] = 0xFF; |
854123bf CLG |
240 | |
241 | timer_del(s->timer); | |
242 | } | |
243 | ||
244 | static void aspeed_wdt_timer_expired(void *dev) | |
245 | { | |
246 | AspeedWDTState *s = ASPEED_WDT(dev); | |
6112bd6d | 247 | uint32_t reset_ctrl_reg = ASPEED_WDT_GET_CLASS(s)->reset_ctrl_reg; |
854123bf | 248 | |
3059c2f5 | 249 | /* Do not reset on SDRAM controller reset */ |
6112bd6d | 250 | if (s->scu->regs[reset_ctrl_reg] & SCU_RESET_SDRAM) { |
3059c2f5 JS |
251 | timer_del(s->timer); |
252 | s->regs[WDT_CTRL] = 0; | |
253 | return; | |
254 | } | |
255 | ||
aabf1de4 JS |
256 | qemu_log_mask(CPU_LOG_RESET, "Watchdog timer %" HWADDR_PRIx " expired.\n", |
257 | s->iomem.addr); | |
854123bf CLG |
258 | watchdog_perform_action(); |
259 | timer_del(s->timer); | |
260 | } | |
261 | ||
262 | #define PCLK_HZ 24000000 | |
263 | ||
264 | static void aspeed_wdt_realize(DeviceState *dev, Error **errp) | |
265 | { | |
266 | SysBusDevice *sbd = SYS_BUS_DEVICE(dev); | |
267 | AspeedWDTState *s = ASPEED_WDT(dev); | |
3059c2f5 | 268 | |
2ec11f23 | 269 | assert(s->scu); |
854123bf CLG |
270 | |
271 | s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, aspeed_wdt_timer_expired, dev); | |
272 | ||
273 | /* FIXME: This setting should be derived from the SCU hw strapping | |
274 | * register SCU70 | |
275 | */ | |
276 | s->pclk_freq = PCLK_HZ; | |
277 | ||
278 | memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_wdt_ops, s, | |
279 | TYPE_ASPEED_WDT, ASPEED_WDT_REGS_MAX * 4); | |
280 | sysbus_init_mmio(sbd, &s->iomem); | |
281 | } | |
282 | ||
2ec11f23 CLG |
283 | static Property aspeed_wdt_properties[] = { |
284 | DEFINE_PROP_LINK("scu", AspeedWDTState, scu, TYPE_ASPEED_SCU, | |
285 | AspeedSCUState *), | |
286 | DEFINE_PROP_END_OF_LIST(), | |
287 | }; | |
288 | ||
854123bf CLG |
289 | static void aspeed_wdt_class_init(ObjectClass *klass, void *data) |
290 | { | |
291 | DeviceClass *dc = DEVICE_CLASS(klass); | |
292 | ||
6112bd6d | 293 | dc->desc = "ASPEED Watchdog Controller"; |
854123bf CLG |
294 | dc->realize = aspeed_wdt_realize; |
295 | dc->reset = aspeed_wdt_reset; | |
296 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); | |
297 | dc->vmsd = &vmstate_aspeed_wdt; | |
4f67d30b | 298 | device_class_set_props(dc, aspeed_wdt_properties); |
854123bf CLG |
299 | } |
300 | ||
301 | static const TypeInfo aspeed_wdt_info = { | |
302 | .parent = TYPE_SYS_BUS_DEVICE, | |
303 | .name = TYPE_ASPEED_WDT, | |
304 | .instance_size = sizeof(AspeedWDTState), | |
305 | .class_init = aspeed_wdt_class_init, | |
6112bd6d CLG |
306 | .class_size = sizeof(AspeedWDTClass), |
307 | .abstract = true, | |
308 | }; | |
309 | ||
310 | static void aspeed_2400_wdt_class_init(ObjectClass *klass, void *data) | |
311 | { | |
312 | DeviceClass *dc = DEVICE_CLASS(klass); | |
313 | AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass); | |
314 | ||
315 | dc->desc = "ASPEED 2400 Watchdog Controller"; | |
316 | awc->offset = 0x20; | |
317 | awc->ext_pulse_width_mask = 0xff; | |
318 | awc->reset_ctrl_reg = SCU_RESET_CONTROL1; | |
28c80f15 | 319 | awc->wdt_reload = aspeed_wdt_reload; |
709098fd | 320 | awc->sanitize_ctrl = aspeed_2400_sanitize_ctrl; |
6112bd6d CLG |
321 | } |
322 | ||
323 | static const TypeInfo aspeed_2400_wdt_info = { | |
324 | .name = TYPE_ASPEED_2400_WDT, | |
325 | .parent = TYPE_ASPEED_WDT, | |
326 | .instance_size = sizeof(AspeedWDTState), | |
327 | .class_init = aspeed_2400_wdt_class_init, | |
328 | }; | |
329 | ||
330 | static void aspeed_2500_wdt_reset_pulse(AspeedWDTState *s, uint32_t property) | |
331 | { | |
332 | if (property) { | |
333 | if (property == WDT_ACTIVE_HIGH_MAGIC) { | |
334 | s->regs[WDT_RESET_WIDTH] |= WDT_RESET_WIDTH_ACTIVE_HIGH; | |
335 | } else if (property == WDT_ACTIVE_LOW_MAGIC) { | |
336 | s->regs[WDT_RESET_WIDTH] &= ~WDT_RESET_WIDTH_ACTIVE_HIGH; | |
337 | } else if (property == WDT_PUSH_PULL_MAGIC) { | |
338 | s->regs[WDT_RESET_WIDTH] |= WDT_RESET_WIDTH_PUSH_PULL; | |
339 | } else if (property == WDT_OPEN_DRAIN_MAGIC) { | |
340 | s->regs[WDT_RESET_WIDTH] &= ~WDT_RESET_WIDTH_PUSH_PULL; | |
341 | } | |
342 | } | |
343 | } | |
344 | ||
345 | static void aspeed_2500_wdt_class_init(ObjectClass *klass, void *data) | |
346 | { | |
347 | DeviceClass *dc = DEVICE_CLASS(klass); | |
348 | AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass); | |
349 | ||
350 | dc->desc = "ASPEED 2500 Watchdog Controller"; | |
351 | awc->offset = 0x20; | |
352 | awc->ext_pulse_width_mask = 0xfffff; | |
353 | awc->reset_ctrl_reg = SCU_RESET_CONTROL1; | |
354 | awc->reset_pulse = aspeed_2500_wdt_reset_pulse; | |
28c80f15 | 355 | awc->wdt_reload = aspeed_wdt_reload_1mhz; |
709098fd | 356 | awc->sanitize_ctrl = aspeed_2500_sanitize_ctrl; |
6112bd6d CLG |
357 | } |
358 | ||
359 | static const TypeInfo aspeed_2500_wdt_info = { | |
360 | .name = TYPE_ASPEED_2500_WDT, | |
361 | .parent = TYPE_ASPEED_WDT, | |
362 | .instance_size = sizeof(AspeedWDTState), | |
363 | .class_init = aspeed_2500_wdt_class_init, | |
854123bf CLG |
364 | }; |
365 | ||
6b2b2a70 JS |
366 | static void aspeed_2600_wdt_class_init(ObjectClass *klass, void *data) |
367 | { | |
368 | DeviceClass *dc = DEVICE_CLASS(klass); | |
369 | AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass); | |
370 | ||
371 | dc->desc = "ASPEED 2600 Watchdog Controller"; | |
372 | awc->offset = 0x40; | |
373 | awc->ext_pulse_width_mask = 0xfffff; /* TODO */ | |
374 | awc->reset_ctrl_reg = AST2600_SCU_RESET_CONTROL1; | |
375 | awc->reset_pulse = aspeed_2500_wdt_reset_pulse; | |
28c80f15 | 376 | awc->wdt_reload = aspeed_wdt_reload_1mhz; |
709098fd | 377 | awc->sanitize_ctrl = aspeed_2600_sanitize_ctrl; |
6b2b2a70 JS |
378 | } |
379 | ||
380 | static const TypeInfo aspeed_2600_wdt_info = { | |
381 | .name = TYPE_ASPEED_2600_WDT, | |
382 | .parent = TYPE_ASPEED_WDT, | |
383 | .instance_size = sizeof(AspeedWDTState), | |
384 | .class_init = aspeed_2600_wdt_class_init, | |
385 | }; | |
386 | ||
854123bf CLG |
387 | static void wdt_aspeed_register_types(void) |
388 | { | |
389 | watchdog_add_model(&model); | |
390 | type_register_static(&aspeed_wdt_info); | |
6112bd6d CLG |
391 | type_register_static(&aspeed_2400_wdt_info); |
392 | type_register_static(&aspeed_2500_wdt_info); | |
6b2b2a70 | 393 | type_register_static(&aspeed_2600_wdt_info); |
854123bf CLG |
394 | } |
395 | ||
396 | type_init(wdt_aspeed_register_types) |