1 /* 2 * QEMU ETRAX Timers 3 * 4 * Copyright (c) 2007 Edgar E. Iglesias, Axis Communications AB. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "hw/sysbus.h" 27 #include "sysemu/reset.h" 28 #include "sysemu/runstate.h" 29 #include "migration/vmstate.h" 30 #include "qemu/module.h" 31 #include "qemu/timer.h" 32 #include "hw/irq.h" 33 #include "hw/ptimer.h" 34 #include "qom/object.h" 35 36 #define D(x) 37 38 #define RW_TMR0_DIV 0x00 39 #define R_TMR0_DATA 0x04 40 #define RW_TMR0_CTRL 0x08 41 #define RW_TMR1_DIV 0x10 42 #define R_TMR1_DATA 0x14 43 #define RW_TMR1_CTRL 0x18 44 #define R_TIME 0x38 45 #define RW_WD_CTRL 0x40 46 #define R_WD_STAT 0x44 47 #define RW_INTR_MASK 0x48 48 #define RW_ACK_INTR 0x4c 49 #define R_INTR 0x50 50 #define R_MASKED_INTR 0x54 51 52 #define TYPE_ETRAX_FS_TIMER "etraxfs-timer" 53 typedef struct ETRAXTimerState ETRAXTimerState; 54 DECLARE_INSTANCE_CHECKER(ETRAXTimerState, ETRAX_TIMER, 55 TYPE_ETRAX_FS_TIMER) 56 57 struct ETRAXTimerState { 58 SysBusDevice parent_obj; 59 60 MemoryRegion mmio; 61 qemu_irq irq; 62 qemu_irq nmi; 63 64 ptimer_state *ptimer_t0; 65 ptimer_state *ptimer_t1; 66 ptimer_state *ptimer_wd; 67 68 uint32_t wd_hits; 69 70 /* Control registers. */ 71 uint32_t rw_tmr0_div; 72 uint32_t r_tmr0_data; 73 uint32_t rw_tmr0_ctrl; 74 75 uint32_t rw_tmr1_div; 76 uint32_t r_tmr1_data; 77 uint32_t rw_tmr1_ctrl; 78 79 uint32_t rw_wd_ctrl; 80 81 uint32_t rw_intr_mask; 82 uint32_t rw_ack_intr; 83 uint32_t r_intr; 84 uint32_t r_masked_intr; 85 }; 86 87 static const VMStateDescription vmstate_etraxfs = { 88 .name = "etraxfs", 89 .version_id = 0, 90 .minimum_version_id = 0, 91 .fields = (const VMStateField[]) { 92 VMSTATE_PTIMER(ptimer_t0, ETRAXTimerState), 93 VMSTATE_PTIMER(ptimer_t1, ETRAXTimerState), 94 VMSTATE_PTIMER(ptimer_wd, ETRAXTimerState), 95 96 VMSTATE_UINT32(wd_hits, ETRAXTimerState), 97 98 VMSTATE_UINT32(rw_tmr0_div, ETRAXTimerState), 99 VMSTATE_UINT32(r_tmr0_data, ETRAXTimerState), 100 VMSTATE_UINT32(rw_tmr0_ctrl, ETRAXTimerState), 101 102 VMSTATE_UINT32(rw_tmr1_div, ETRAXTimerState), 103 VMSTATE_UINT32(r_tmr1_data, ETRAXTimerState), 104 VMSTATE_UINT32(rw_tmr1_ctrl, ETRAXTimerState), 105 106 VMSTATE_UINT32(rw_wd_ctrl, ETRAXTimerState), 107 108 VMSTATE_UINT32(rw_intr_mask, ETRAXTimerState), 109 VMSTATE_UINT32(rw_ack_intr, ETRAXTimerState), 110 VMSTATE_UINT32(r_intr, ETRAXTimerState), 111 VMSTATE_UINT32(r_masked_intr, ETRAXTimerState), 112 113 VMSTATE_END_OF_LIST() 114 } 115 }; 116 117 static uint64_t 118 timer_read(void *opaque, hwaddr addr, unsigned int size) 119 { 120 ETRAXTimerState *t = opaque; 121 uint32_t r = 0; 122 123 switch (addr) { 124 case R_TMR0_DATA: 125 r = ptimer_get_count(t->ptimer_t0); 126 break; 127 case R_TMR1_DATA: 128 r = ptimer_get_count(t->ptimer_t1); 129 break; 130 case R_TIME: 131 r = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) / 10; 132 break; 133 case RW_INTR_MASK: 134 r = t->rw_intr_mask; 135 break; 136 case R_MASKED_INTR: 137 r = t->r_intr & t->rw_intr_mask; 138 break; 139 default: 140 D(printf ("%s %x\n", __func__, addr)); 141 break; 142 } 143 return r; 144 } 145 146 static void update_ctrl(ETRAXTimerState *t, int tnum) 147 { 148 unsigned int op; 149 unsigned int freq; 150 unsigned int freq_hz; 151 unsigned int div; 152 uint32_t ctrl; 153 154 ptimer_state *timer; 155 156 if (tnum == 0) { 157 ctrl = t->rw_tmr0_ctrl; 158 div = t->rw_tmr0_div; 159 timer = t->ptimer_t0; 160 } else { 161 ctrl = t->rw_tmr1_ctrl; 162 div = t->rw_tmr1_div; 163 timer = t->ptimer_t1; 164 } 165 166 167 op = ctrl & 3; 168 freq = ctrl >> 2; 169 freq_hz = 32000000; 170 171 switch (freq) 172 { 173 case 0: 174 case 1: 175 D(printf ("extern or disabled timer clock?\n")); 176 break; 177 case 4: freq_hz = 29493000; break; 178 case 5: freq_hz = 32000000; break; 179 case 6: freq_hz = 32768000; break; 180 case 7: freq_hz = 100000000; break; 181 default: 182 abort(); 183 break; 184 } 185 186 D(printf ("freq_hz=%d div=%d\n", freq_hz, div)); 187 ptimer_transaction_begin(timer); 188 ptimer_set_freq(timer, freq_hz); 189 ptimer_set_limit(timer, div, 0); 190 191 switch (op) 192 { 193 case 0: 194 /* Load. */ 195 ptimer_set_limit(timer, div, 1); 196 break; 197 case 1: 198 /* Hold. */ 199 ptimer_stop(timer); 200 break; 201 case 2: 202 /* Run. */ 203 ptimer_run(timer, 0); 204 break; 205 default: 206 abort(); 207 break; 208 } 209 ptimer_transaction_commit(timer); 210 } 211 212 static void timer_update_irq(ETRAXTimerState *t) 213 { 214 t->r_intr &= ~(t->rw_ack_intr); 215 t->r_masked_intr = t->r_intr & t->rw_intr_mask; 216 217 D(printf("%s: masked_intr=%x\n", __func__, t->r_masked_intr)); 218 qemu_set_irq(t->irq, !!t->r_masked_intr); 219 } 220 221 static void timer0_hit(void *opaque) 222 { 223 ETRAXTimerState *t = opaque; 224 t->r_intr |= 1; 225 timer_update_irq(t); 226 } 227 228 static void timer1_hit(void *opaque) 229 { 230 ETRAXTimerState *t = opaque; 231 t->r_intr |= 2; 232 timer_update_irq(t); 233 } 234 235 static void watchdog_hit(void *opaque) 236 { 237 ETRAXTimerState *t = opaque; 238 if (t->wd_hits == 0) { 239 /* real hw gives a single tick before resetting but we are 240 a bit friendlier to compensate for our slower execution. */ 241 ptimer_set_count(t->ptimer_wd, 10); 242 ptimer_run(t->ptimer_wd, 1); 243 qemu_irq_raise(t->nmi); 244 } 245 else 246 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); 247 248 t->wd_hits++; 249 } 250 251 static inline void timer_watchdog_update(ETRAXTimerState *t, uint32_t value) 252 { 253 unsigned int wd_en = t->rw_wd_ctrl & (1 << 8); 254 unsigned int wd_key = t->rw_wd_ctrl >> 9; 255 unsigned int wd_cnt = t->rw_wd_ctrl & 511; 256 unsigned int new_key = value >> 9 & ((1 << 7) - 1); 257 unsigned int new_cmd = (value >> 8) & 1; 258 259 /* If the watchdog is enabled, they written key must match the 260 complement of the previous. */ 261 wd_key = ~wd_key & ((1 << 7) - 1); 262 263 if (wd_en && wd_key != new_key) 264 return; 265 266 D(printf("en=%d new_key=%x oldkey=%x cmd=%d cnt=%d\n", 267 wd_en, new_key, wd_key, new_cmd, wd_cnt)); 268 269 if (t->wd_hits) 270 qemu_irq_lower(t->nmi); 271 272 t->wd_hits = 0; 273 274 ptimer_transaction_begin(t->ptimer_wd); 275 ptimer_set_freq(t->ptimer_wd, 760); 276 if (wd_cnt == 0) 277 wd_cnt = 256; 278 ptimer_set_count(t->ptimer_wd, wd_cnt); 279 if (new_cmd) 280 ptimer_run(t->ptimer_wd, 1); 281 else 282 ptimer_stop(t->ptimer_wd); 283 284 t->rw_wd_ctrl = value; 285 ptimer_transaction_commit(t->ptimer_wd); 286 } 287 288 static void 289 timer_write(void *opaque, hwaddr addr, 290 uint64_t val64, unsigned int size) 291 { 292 ETRAXTimerState *t = opaque; 293 uint32_t value = val64; 294 295 switch (addr) 296 { 297 case RW_TMR0_DIV: 298 t->rw_tmr0_div = value; 299 break; 300 case RW_TMR0_CTRL: 301 D(printf ("RW_TMR0_CTRL=%x\n", value)); 302 t->rw_tmr0_ctrl = value; 303 update_ctrl(t, 0); 304 break; 305 case RW_TMR1_DIV: 306 t->rw_tmr1_div = value; 307 break; 308 case RW_TMR1_CTRL: 309 D(printf ("RW_TMR1_CTRL=%x\n", value)); 310 t->rw_tmr1_ctrl = value; 311 update_ctrl(t, 1); 312 break; 313 case RW_INTR_MASK: 314 D(printf ("RW_INTR_MASK=%x\n", value)); 315 t->rw_intr_mask = value; 316 timer_update_irq(t); 317 break; 318 case RW_WD_CTRL: 319 timer_watchdog_update(t, value); 320 break; 321 case RW_ACK_INTR: 322 t->rw_ack_intr = value; 323 timer_update_irq(t); 324 t->rw_ack_intr = 0; 325 break; 326 default: 327 printf("%s " HWADDR_FMT_plx " %x\n", __func__, addr, value); 328 break; 329 } 330 } 331 332 static const MemoryRegionOps timer_ops = { 333 .read = timer_read, 334 .write = timer_write, 335 .endianness = DEVICE_LITTLE_ENDIAN, 336 .valid = { 337 .min_access_size = 4, 338 .max_access_size = 4 339 } 340 }; 341 342 static void etraxfs_timer_reset_enter(Object *obj, ResetType type) 343 { 344 ETRAXTimerState *t = ETRAX_TIMER(obj); 345 346 ptimer_transaction_begin(t->ptimer_t0); 347 ptimer_stop(t->ptimer_t0); 348 ptimer_transaction_commit(t->ptimer_t0); 349 ptimer_transaction_begin(t->ptimer_t1); 350 ptimer_stop(t->ptimer_t1); 351 ptimer_transaction_commit(t->ptimer_t1); 352 ptimer_transaction_begin(t->ptimer_wd); 353 ptimer_stop(t->ptimer_wd); 354 ptimer_transaction_commit(t->ptimer_wd); 355 t->rw_wd_ctrl = 0; 356 t->r_intr = 0; 357 t->rw_intr_mask = 0; 358 } 359 360 static void etraxfs_timer_reset_hold(Object *obj, ResetType type) 361 { 362 ETRAXTimerState *t = ETRAX_TIMER(obj); 363 364 qemu_irq_lower(t->irq); 365 } 366 367 static void etraxfs_timer_realize(DeviceState *dev, Error **errp) 368 { 369 ETRAXTimerState *t = ETRAX_TIMER(dev); 370 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 371 372 t->ptimer_t0 = ptimer_init(timer0_hit, t, PTIMER_POLICY_LEGACY); 373 t->ptimer_t1 = ptimer_init(timer1_hit, t, PTIMER_POLICY_LEGACY); 374 t->ptimer_wd = ptimer_init(watchdog_hit, t, PTIMER_POLICY_LEGACY); 375 376 sysbus_init_irq(sbd, &t->irq); 377 sysbus_init_irq(sbd, &t->nmi); 378 379 memory_region_init_io(&t->mmio, OBJECT(t), &timer_ops, t, 380 "etraxfs-timer", 0x5c); 381 sysbus_init_mmio(sbd, &t->mmio); 382 } 383 384 static void etraxfs_timer_class_init(ObjectClass *klass, void *data) 385 { 386 DeviceClass *dc = DEVICE_CLASS(klass); 387 ResettableClass *rc = RESETTABLE_CLASS(klass); 388 389 dc->realize = etraxfs_timer_realize; 390 dc->vmsd = &vmstate_etraxfs; 391 rc->phases.enter = etraxfs_timer_reset_enter; 392 rc->phases.hold = etraxfs_timer_reset_hold; 393 } 394 395 static const TypeInfo etraxfs_timer_info = { 396 .name = TYPE_ETRAX_FS_TIMER, 397 .parent = TYPE_SYS_BUS_DEVICE, 398 .instance_size = sizeof(ETRAXTimerState), 399 .class_init = etraxfs_timer_class_init, 400 }; 401 402 static void etraxfs_timer_register_types(void) 403 { 404 type_register_static(&etraxfs_timer_info); 405 } 406 407 type_init(etraxfs_timer_register_types) 408