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" 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/qdev-properties.h" 18 #include "hw/sysbus.h" 19 #include "hw/watchdog/wdt_aspeed.h" 20 #include "migration/vmstate.h" 21 #include "trace.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 #define WDT_RESET_MASK2 (0x20 / 4) 45 46 #define WDT_SW_RESET_CTRL (0x24 / 4) 47 #define WDT_SW_RESET_MASK1 (0x28 / 4) 48 #define WDT_SW_RESET_MASK2 (0x2c / 4) 49 50 #define WDT_TIMEOUT_STATUS (0x10 / 4) 51 #define WDT_TIMEOUT_CLEAR (0x14 / 4) 52 53 #define WDT_RESTART_MAGIC 0x4755 54 55 #define AST2600_SCU_RESET_CONTROL1 (0x40 / 4) 56 #define SCU_RESET_CONTROL1 (0x04 / 4) 57 #define SCU_RESET_SDRAM BIT(0) 58 59 static bool aspeed_wdt_is_enabled(const AspeedWDTState *s) 60 { 61 return s->regs[WDT_CTRL] & WDT_CTRL_ENABLE; 62 } 63 64 static uint64_t aspeed_wdt_read(void *opaque, hwaddr offset, unsigned size) 65 { 66 AspeedWDTState *s = ASPEED_WDT(opaque); 67 68 trace_aspeed_wdt_read(offset, size); 69 70 offset >>= 2; 71 72 switch (offset) { 73 case WDT_STATUS: 74 return s->regs[WDT_STATUS]; 75 case WDT_RELOAD_VALUE: 76 return s->regs[WDT_RELOAD_VALUE]; 77 case WDT_RESTART: 78 qemu_log_mask(LOG_GUEST_ERROR, 79 "%s: read from write-only reg at offset 0x%" 80 HWADDR_PRIx "\n", __func__, offset); 81 return 0; 82 case WDT_CTRL: 83 return s->regs[WDT_CTRL]; 84 case WDT_RESET_WIDTH: 85 return s->regs[WDT_RESET_WIDTH]; 86 case WDT_RESET_MASK1: 87 return s->regs[WDT_RESET_MASK1]; 88 case WDT_TIMEOUT_STATUS: 89 case WDT_TIMEOUT_CLEAR: 90 case WDT_RESET_MASK2: 91 case WDT_SW_RESET_CTRL: 92 case WDT_SW_RESET_MASK1: 93 case WDT_SW_RESET_MASK2: 94 qemu_log_mask(LOG_UNIMP, 95 "%s: uninmplemented read at offset 0x%" HWADDR_PRIx "\n", 96 __func__, offset); 97 return 0; 98 default: 99 qemu_log_mask(LOG_GUEST_ERROR, 100 "%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n", 101 __func__, offset); 102 return 0; 103 } 104 105 } 106 107 static void aspeed_wdt_reload(AspeedWDTState *s) 108 { 109 uint64_t reload; 110 111 if (!(s->regs[WDT_CTRL] & WDT_CTRL_1MHZ_CLK)) { 112 reload = muldiv64(s->regs[WDT_RELOAD_VALUE], NANOSECONDS_PER_SECOND, 113 s->pclk_freq); 114 } else { 115 reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL; 116 } 117 118 if (aspeed_wdt_is_enabled(s)) { 119 timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload); 120 } 121 } 122 123 static void aspeed_wdt_reload_1mhz(AspeedWDTState *s) 124 { 125 uint64_t reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL; 126 127 if (aspeed_wdt_is_enabled(s)) { 128 timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload); 129 } 130 } 131 132 static uint64_t aspeed_2400_sanitize_ctrl(uint64_t data) 133 { 134 return data & 0xffff; 135 } 136 137 static uint64_t aspeed_2500_sanitize_ctrl(uint64_t data) 138 { 139 return (data & ~(0xfUL << 8)) | WDT_CTRL_1MHZ_CLK; 140 } 141 142 static uint64_t aspeed_2600_sanitize_ctrl(uint64_t data) 143 { 144 return data & ~(0x7UL << 7); 145 } 146 147 static void aspeed_wdt_write(void *opaque, hwaddr offset, uint64_t data, 148 unsigned size) 149 { 150 AspeedWDTState *s = ASPEED_WDT(opaque); 151 AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(s); 152 bool enable; 153 154 trace_aspeed_wdt_write(offset, size, data); 155 156 offset >>= 2; 157 158 switch (offset) { 159 case WDT_STATUS: 160 qemu_log_mask(LOG_GUEST_ERROR, 161 "%s: write to read-only reg at offset 0x%" 162 HWADDR_PRIx "\n", __func__, offset); 163 break; 164 case WDT_RELOAD_VALUE: 165 s->regs[WDT_RELOAD_VALUE] = data; 166 break; 167 case WDT_RESTART: 168 if ((data & 0xFFFF) == WDT_RESTART_MAGIC) { 169 s->regs[WDT_STATUS] = s->regs[WDT_RELOAD_VALUE]; 170 awc->wdt_reload(s); 171 } 172 break; 173 case WDT_CTRL: 174 data = awc->sanitize_ctrl(data); 175 enable = data & WDT_CTRL_ENABLE; 176 if (enable && !aspeed_wdt_is_enabled(s)) { 177 s->regs[WDT_CTRL] = data; 178 awc->wdt_reload(s); 179 } else if (!enable && aspeed_wdt_is_enabled(s)) { 180 s->regs[WDT_CTRL] = data; 181 timer_del(s->timer); 182 } else { 183 s->regs[WDT_CTRL] = data; 184 } 185 break; 186 case WDT_RESET_WIDTH: 187 if (awc->reset_pulse) { 188 awc->reset_pulse(s, data & WDT_POLARITY_MASK); 189 } 190 s->regs[WDT_RESET_WIDTH] &= ~awc->ext_pulse_width_mask; 191 s->regs[WDT_RESET_WIDTH] |= data & awc->ext_pulse_width_mask; 192 break; 193 194 case WDT_RESET_MASK1: 195 /* TODO: implement */ 196 s->regs[WDT_RESET_MASK1] = data; 197 break; 198 199 case WDT_TIMEOUT_STATUS: 200 case WDT_TIMEOUT_CLEAR: 201 case WDT_RESET_MASK2: 202 case WDT_SW_RESET_CTRL: 203 case WDT_SW_RESET_MASK1: 204 case WDT_SW_RESET_MASK2: 205 qemu_log_mask(LOG_UNIMP, 206 "%s: uninmplemented write at offset 0x%" HWADDR_PRIx "\n", 207 __func__, offset); 208 break; 209 default: 210 qemu_log_mask(LOG_GUEST_ERROR, 211 "%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n", 212 __func__, offset); 213 } 214 return; 215 } 216 217 static const VMStateDescription vmstate_aspeed_wdt = { 218 .name = "vmstate_aspeed_wdt", 219 .version_id = 0, 220 .minimum_version_id = 0, 221 .fields = (VMStateField[]) { 222 VMSTATE_TIMER_PTR(timer, AspeedWDTState), 223 VMSTATE_UINT32_ARRAY(regs, AspeedWDTState, ASPEED_WDT_REGS_MAX), 224 VMSTATE_END_OF_LIST() 225 } 226 }; 227 228 static const MemoryRegionOps aspeed_wdt_ops = { 229 .read = aspeed_wdt_read, 230 .write = aspeed_wdt_write, 231 .endianness = DEVICE_LITTLE_ENDIAN, 232 .valid.min_access_size = 4, 233 .valid.max_access_size = 4, 234 .valid.unaligned = false, 235 }; 236 237 static void aspeed_wdt_reset(DeviceState *dev) 238 { 239 AspeedWDTState *s = ASPEED_WDT(dev); 240 AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(s); 241 242 s->regs[WDT_STATUS] = awc->default_status; 243 s->regs[WDT_RELOAD_VALUE] = awc->default_reload_value; 244 s->regs[WDT_RESTART] = 0; 245 s->regs[WDT_CTRL] = awc->sanitize_ctrl(0); 246 s->regs[WDT_RESET_WIDTH] = 0xFF; 247 248 timer_del(s->timer); 249 } 250 251 static void aspeed_wdt_timer_expired(void *dev) 252 { 253 AspeedWDTState *s = ASPEED_WDT(dev); 254 uint32_t reset_ctrl_reg = ASPEED_WDT_GET_CLASS(s)->reset_ctrl_reg; 255 256 /* Do not reset on SDRAM controller reset */ 257 if (s->scu->regs[reset_ctrl_reg] & SCU_RESET_SDRAM) { 258 timer_del(s->timer); 259 s->regs[WDT_CTRL] = 0; 260 return; 261 } 262 263 qemu_log_mask(CPU_LOG_RESET, "Watchdog timer %" HWADDR_PRIx " expired.\n", 264 s->iomem.addr); 265 watchdog_perform_action(); 266 timer_del(s->timer); 267 } 268 269 #define PCLK_HZ 24000000 270 271 static void aspeed_wdt_realize(DeviceState *dev, Error **errp) 272 { 273 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 274 AspeedWDTState *s = ASPEED_WDT(dev); 275 AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(dev); 276 277 assert(s->scu); 278 279 s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, aspeed_wdt_timer_expired, dev); 280 281 /* FIXME: This setting should be derived from the SCU hw strapping 282 * register SCU70 283 */ 284 s->pclk_freq = PCLK_HZ; 285 286 memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_wdt_ops, s, 287 TYPE_ASPEED_WDT, awc->iosize); 288 sysbus_init_mmio(sbd, &s->iomem); 289 } 290 291 static Property aspeed_wdt_properties[] = { 292 DEFINE_PROP_LINK("scu", AspeedWDTState, scu, TYPE_ASPEED_SCU, 293 AspeedSCUState *), 294 DEFINE_PROP_END_OF_LIST(), 295 }; 296 297 static void aspeed_wdt_class_init(ObjectClass *klass, void *data) 298 { 299 DeviceClass *dc = DEVICE_CLASS(klass); 300 301 dc->desc = "ASPEED Watchdog Controller"; 302 dc->realize = aspeed_wdt_realize; 303 dc->reset = aspeed_wdt_reset; 304 set_bit(DEVICE_CATEGORY_WATCHDOG, dc->categories); 305 dc->vmsd = &vmstate_aspeed_wdt; 306 device_class_set_props(dc, aspeed_wdt_properties); 307 dc->desc = "Aspeed watchdog device"; 308 } 309 310 static const TypeInfo aspeed_wdt_info = { 311 .parent = TYPE_SYS_BUS_DEVICE, 312 .name = TYPE_ASPEED_WDT, 313 .instance_size = sizeof(AspeedWDTState), 314 .class_init = aspeed_wdt_class_init, 315 .class_size = sizeof(AspeedWDTClass), 316 .abstract = true, 317 }; 318 319 static void aspeed_2400_wdt_class_init(ObjectClass *klass, void *data) 320 { 321 DeviceClass *dc = DEVICE_CLASS(klass); 322 AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass); 323 324 dc->desc = "ASPEED 2400 Watchdog Controller"; 325 awc->iosize = 0x20; 326 awc->ext_pulse_width_mask = 0xff; 327 awc->reset_ctrl_reg = SCU_RESET_CONTROL1; 328 awc->wdt_reload = aspeed_wdt_reload; 329 awc->sanitize_ctrl = aspeed_2400_sanitize_ctrl; 330 awc->default_status = 0x03EF1480; 331 awc->default_reload_value = 0x03EF1480; 332 } 333 334 static const TypeInfo aspeed_2400_wdt_info = { 335 .name = TYPE_ASPEED_2400_WDT, 336 .parent = TYPE_ASPEED_WDT, 337 .instance_size = sizeof(AspeedWDTState), 338 .class_init = aspeed_2400_wdt_class_init, 339 }; 340 341 static void aspeed_2500_wdt_reset_pulse(AspeedWDTState *s, uint32_t property) 342 { 343 if (property) { 344 if (property == WDT_ACTIVE_HIGH_MAGIC) { 345 s->regs[WDT_RESET_WIDTH] |= WDT_RESET_WIDTH_ACTIVE_HIGH; 346 } else if (property == WDT_ACTIVE_LOW_MAGIC) { 347 s->regs[WDT_RESET_WIDTH] &= ~WDT_RESET_WIDTH_ACTIVE_HIGH; 348 } else if (property == WDT_PUSH_PULL_MAGIC) { 349 s->regs[WDT_RESET_WIDTH] |= WDT_RESET_WIDTH_PUSH_PULL; 350 } else if (property == WDT_OPEN_DRAIN_MAGIC) { 351 s->regs[WDT_RESET_WIDTH] &= ~WDT_RESET_WIDTH_PUSH_PULL; 352 } 353 } 354 } 355 356 static void aspeed_2500_wdt_class_init(ObjectClass *klass, void *data) 357 { 358 DeviceClass *dc = DEVICE_CLASS(klass); 359 AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass); 360 361 dc->desc = "ASPEED 2500 Watchdog Controller"; 362 awc->iosize = 0x20; 363 awc->ext_pulse_width_mask = 0xfffff; 364 awc->reset_ctrl_reg = SCU_RESET_CONTROL1; 365 awc->reset_pulse = aspeed_2500_wdt_reset_pulse; 366 awc->wdt_reload = aspeed_wdt_reload_1mhz; 367 awc->sanitize_ctrl = aspeed_2500_sanitize_ctrl; 368 awc->default_status = 0x014FB180; 369 awc->default_reload_value = 0x014FB180; 370 } 371 372 static const TypeInfo aspeed_2500_wdt_info = { 373 .name = TYPE_ASPEED_2500_WDT, 374 .parent = TYPE_ASPEED_WDT, 375 .instance_size = sizeof(AspeedWDTState), 376 .class_init = aspeed_2500_wdt_class_init, 377 }; 378 379 static void aspeed_2600_wdt_class_init(ObjectClass *klass, void *data) 380 { 381 DeviceClass *dc = DEVICE_CLASS(klass); 382 AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass); 383 384 dc->desc = "ASPEED 2600 Watchdog Controller"; 385 awc->iosize = 0x40; 386 awc->ext_pulse_width_mask = 0xfffff; /* TODO */ 387 awc->reset_ctrl_reg = AST2600_SCU_RESET_CONTROL1; 388 awc->reset_pulse = aspeed_2500_wdt_reset_pulse; 389 awc->wdt_reload = aspeed_wdt_reload_1mhz; 390 awc->sanitize_ctrl = aspeed_2600_sanitize_ctrl; 391 awc->default_status = 0x014FB180; 392 awc->default_reload_value = 0x014FB180; 393 } 394 395 static const TypeInfo aspeed_2600_wdt_info = { 396 .name = TYPE_ASPEED_2600_WDT, 397 .parent = TYPE_ASPEED_WDT, 398 .instance_size = sizeof(AspeedWDTState), 399 .class_init = aspeed_2600_wdt_class_init, 400 }; 401 402 static void aspeed_1030_wdt_class_init(ObjectClass *klass, void *data) 403 { 404 DeviceClass *dc = DEVICE_CLASS(klass); 405 AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass); 406 407 dc->desc = "ASPEED 1030 Watchdog Controller"; 408 awc->iosize = 0x80; 409 awc->ext_pulse_width_mask = 0xfffff; /* TODO */ 410 awc->reset_ctrl_reg = AST2600_SCU_RESET_CONTROL1; 411 awc->reset_pulse = aspeed_2500_wdt_reset_pulse; 412 awc->wdt_reload = aspeed_wdt_reload_1mhz; 413 awc->sanitize_ctrl = aspeed_2600_sanitize_ctrl; 414 awc->default_status = 0x014FB180; 415 awc->default_reload_value = 0x014FB180; 416 } 417 418 static const TypeInfo aspeed_1030_wdt_info = { 419 .name = TYPE_ASPEED_1030_WDT, 420 .parent = TYPE_ASPEED_WDT, 421 .instance_size = sizeof(AspeedWDTState), 422 .class_init = aspeed_1030_wdt_class_init, 423 }; 424 425 static void wdt_aspeed_register_types(void) 426 { 427 type_register_static(&aspeed_wdt_info); 428 type_register_static(&aspeed_2400_wdt_info); 429 type_register_static(&aspeed_2500_wdt_info); 430 type_register_static(&aspeed_2600_wdt_info); 431 type_register_static(&aspeed_1030_wdt_info); 432 } 433 434 type_init(wdt_aspeed_register_types) 435