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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"
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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
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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)
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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)
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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
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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)
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52#define SCU_RESET_CONTROL1 (0x04 / 4)
53#define SCU_RESET_SDRAM BIT(0)
54
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55static bool aspeed_wdt_is_enabled(const AspeedWDTState *s)
56{
57 return s->regs[WDT_CTRL] & WDT_CTRL_ENABLE;
58}
59
60static uint64_t aspeed_wdt_read(void *opaque, hwaddr offset, unsigned size)
61{
62 AspeedWDTState *s = ASPEED_WDT(opaque);
63
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64 trace_aspeed_wdt_read(offset, size);
65
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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];
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80 case WDT_RESET_WIDTH:
81 return s->regs[WDT_RESET_WIDTH];
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82 case WDT_RESET_MASK1:
83 return s->regs[WDT_RESET_MASK1];
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84 case WDT_TIMEOUT_STATUS:
85 case WDT_TIMEOUT_CLEAR:
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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 99static 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)) {
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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;
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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
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115static 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
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124static uint64_t aspeed_2400_sanitize_ctrl(uint64_t data)
125{
126 return data & 0xffff;
127}
128
129static uint64_t aspeed_2500_sanitize_ctrl(uint64_t data)
130{
131 return (data & ~(0xfUL << 8)) | WDT_CTRL_1MHZ_CLK;
132}
133
134static uint64_t aspeed_2600_sanitize_ctrl(uint64_t data)
135{
136 return data & ~(0x7UL << 7);
137}
28c80f15 138
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139static 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
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146 trace_aspeed_wdt_write(offset, size, data);
147
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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);
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163 }
164 break;
165 case WDT_CTRL:
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166 data = awc->sanitize_ctrl(data);
167 enable = data & WDT_CTRL_ENABLE;
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168 if (enable && !aspeed_wdt_is_enabled(s)) {
169 s->regs[WDT_CTRL] = data;
28c80f15 170 awc->wdt_reload(s);
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171 } else if (!enable && aspeed_wdt_is_enabled(s)) {
172 s->regs[WDT_CTRL] = data;
173 timer_del(s->timer);
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174 } else {
175 s->regs[WDT_CTRL] = data;
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176 }
177 break;
f55d613b 178 case WDT_RESET_WIDTH:
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179 if (awc->reset_pulse) {
180 awc->reset_pulse(s, data & WDT_POLARITY_MASK);
f55d613b 181 }
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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
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186 case WDT_RESET_MASK1:
187 /* TODO: implement */
188 s->regs[WDT_RESET_MASK1] = data;
189 break;
190
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191 case WDT_TIMEOUT_STATUS:
192 case WDT_TIMEOUT_CLEAR:
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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
205static WatchdogTimerModel model = {
206 .wdt_name = TYPE_ASPEED_WDT,
207 .wdt_description = "Aspeed watchdog device",
208};
209
210static 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
221static 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
230static void aspeed_wdt_reset(DeviceState *dev)
231{
232 AspeedWDTState *s = ASPEED_WDT(dev);
709098fd 233 AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(s);
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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;
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240
241 timer_del(s->timer);
242}
243
244static 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) {
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251 timer_del(s->timer);
252 s->regs[WDT_CTRL] = 0;
253 return;
254 }
255
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256 qemu_log_mask(CPU_LOG_RESET, "Watchdog timer %" HWADDR_PRIx " expired.\n",
257 s->iomem.addr);
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258 watchdog_perform_action();
259 timer_del(s->timer);
260}
261
262#define PCLK_HZ 24000000
263
264static 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);
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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
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283static Property aspeed_wdt_properties[] = {
284 DEFINE_PROP_LINK("scu", AspeedWDTState, scu, TYPE_ASPEED_SCU,
285 AspeedSCUState *),
286 DEFINE_PROP_END_OF_LIST(),
287};
288
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289static void aspeed_wdt_class_init(ObjectClass *klass, void *data)
290{
291 DeviceClass *dc = DEVICE_CLASS(klass);
292
6112bd6d 293 dc->desc = "ASPEED Watchdog Controller";
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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);
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299}
300
301static 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,
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306 .class_size = sizeof(AspeedWDTClass),
307 .abstract = true,
308};
309
310static 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;
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321}
322
323static 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
330static 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
345static 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;
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357}
358
359static 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,
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364};
365
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366static 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;
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378}
379
380static 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
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387static void wdt_aspeed_register_types(void)
388{
389 watchdog_add_model(&model);
390 type_register_static(&aspeed_wdt_info);
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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);
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394}
395
396type_init(wdt_aspeed_register_types)