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 "qemu/module.h" 30 #include "qemu/timer.h" 31 #include "hw/irq.h" 32 #include "hw/ptimer.h" 33 #include "qom/object.h" 34 35 #define D(x) 36 37 #define RW_TMR0_DIV 0x00 38 #define R_TMR0_DATA 0x04 39 #define RW_TMR0_CTRL 0x08 40 #define RW_TMR1_DIV 0x10 41 #define R_TMR1_DATA 0x14 42 #define RW_TMR1_CTRL 0x18 43 #define R_TIME 0x38 44 #define RW_WD_CTRL 0x40 45 #define R_WD_STAT 0x44 46 #define RW_INTR_MASK 0x48 47 #define RW_ACK_INTR 0x4c 48 #define R_INTR 0x50 49 #define R_MASKED_INTR 0x54 50 51 #define TYPE_ETRAX_FS_TIMER "etraxfs,timer" 52 typedef struct ETRAXTimerState ETRAXTimerState; 53 DECLARE_INSTANCE_CHECKER(ETRAXTimerState, ETRAX_TIMER, 54 TYPE_ETRAX_FS_TIMER) 55 56 struct ETRAXTimerState { 57 SysBusDevice parent_obj; 58 59 MemoryRegion mmio; 60 qemu_irq irq; 61 qemu_irq nmi; 62 63 ptimer_state *ptimer_t0; 64 ptimer_state *ptimer_t1; 65 ptimer_state *ptimer_wd; 66 67 int wd_hits; 68 69 /* Control registers. */ 70 uint32_t rw_tmr0_div; 71 uint32_t r_tmr0_data; 72 uint32_t rw_tmr0_ctrl; 73 74 uint32_t rw_tmr1_div; 75 uint32_t r_tmr1_data; 76 uint32_t rw_tmr1_ctrl; 77 78 uint32_t rw_wd_ctrl; 79 80 uint32_t rw_intr_mask; 81 uint32_t rw_ack_intr; 82 uint32_t r_intr; 83 uint32_t r_masked_intr; 84 }; 85 86 static uint64_t 87 timer_read(void *opaque, hwaddr addr, unsigned int size) 88 { 89 ETRAXTimerState *t = opaque; 90 uint32_t r = 0; 91 92 switch (addr) { 93 case R_TMR0_DATA: 94 r = ptimer_get_count(t->ptimer_t0); 95 break; 96 case R_TMR1_DATA: 97 r = ptimer_get_count(t->ptimer_t1); 98 break; 99 case R_TIME: 100 r = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) / 10; 101 break; 102 case RW_INTR_MASK: 103 r = t->rw_intr_mask; 104 break; 105 case R_MASKED_INTR: 106 r = t->r_intr & t->rw_intr_mask; 107 break; 108 default: 109 D(printf ("%s %x\n", __func__, addr)); 110 break; 111 } 112 return r; 113 } 114 115 static void update_ctrl(ETRAXTimerState *t, int tnum) 116 { 117 unsigned int op; 118 unsigned int freq; 119 unsigned int freq_hz; 120 unsigned int div; 121 uint32_t ctrl; 122 123 ptimer_state *timer; 124 125 if (tnum == 0) { 126 ctrl = t->rw_tmr0_ctrl; 127 div = t->rw_tmr0_div; 128 timer = t->ptimer_t0; 129 } else { 130 ctrl = t->rw_tmr1_ctrl; 131 div = t->rw_tmr1_div; 132 timer = t->ptimer_t1; 133 } 134 135 136 op = ctrl & 3; 137 freq = ctrl >> 2; 138 freq_hz = 32000000; 139 140 switch (freq) 141 { 142 case 0: 143 case 1: 144 D(printf ("extern or disabled timer clock?\n")); 145 break; 146 case 4: freq_hz = 29493000; break; 147 case 5: freq_hz = 32000000; break; 148 case 6: freq_hz = 32768000; break; 149 case 7: freq_hz = 100000000; break; 150 default: 151 abort(); 152 break; 153 } 154 155 D(printf ("freq_hz=%d div=%d\n", freq_hz, div)); 156 ptimer_transaction_begin(timer); 157 ptimer_set_freq(timer, freq_hz); 158 ptimer_set_limit(timer, div, 0); 159 160 switch (op) 161 { 162 case 0: 163 /* Load. */ 164 ptimer_set_limit(timer, div, 1); 165 break; 166 case 1: 167 /* Hold. */ 168 ptimer_stop(timer); 169 break; 170 case 2: 171 /* Run. */ 172 ptimer_run(timer, 0); 173 break; 174 default: 175 abort(); 176 break; 177 } 178 ptimer_transaction_commit(timer); 179 } 180 181 static void timer_update_irq(ETRAXTimerState *t) 182 { 183 t->r_intr &= ~(t->rw_ack_intr); 184 t->r_masked_intr = t->r_intr & t->rw_intr_mask; 185 186 D(printf("%s: masked_intr=%x\n", __func__, t->r_masked_intr)); 187 qemu_set_irq(t->irq, !!t->r_masked_intr); 188 } 189 190 static void timer0_hit(void *opaque) 191 { 192 ETRAXTimerState *t = opaque; 193 t->r_intr |= 1; 194 timer_update_irq(t); 195 } 196 197 static void timer1_hit(void *opaque) 198 { 199 ETRAXTimerState *t = opaque; 200 t->r_intr |= 2; 201 timer_update_irq(t); 202 } 203 204 static void watchdog_hit(void *opaque) 205 { 206 ETRAXTimerState *t = opaque; 207 if (t->wd_hits == 0) { 208 /* real hw gives a single tick before reseting but we are 209 a bit friendlier to compensate for our slower execution. */ 210 ptimer_set_count(t->ptimer_wd, 10); 211 ptimer_run(t->ptimer_wd, 1); 212 qemu_irq_raise(t->nmi); 213 } 214 else 215 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); 216 217 t->wd_hits++; 218 } 219 220 static inline void timer_watchdog_update(ETRAXTimerState *t, uint32_t value) 221 { 222 unsigned int wd_en = t->rw_wd_ctrl & (1 << 8); 223 unsigned int wd_key = t->rw_wd_ctrl >> 9; 224 unsigned int wd_cnt = t->rw_wd_ctrl & 511; 225 unsigned int new_key = value >> 9 & ((1 << 7) - 1); 226 unsigned int new_cmd = (value >> 8) & 1; 227 228 /* If the watchdog is enabled, they written key must match the 229 complement of the previous. */ 230 wd_key = ~wd_key & ((1 << 7) - 1); 231 232 if (wd_en && wd_key != new_key) 233 return; 234 235 D(printf("en=%d new_key=%x oldkey=%x cmd=%d cnt=%d\n", 236 wd_en, new_key, wd_key, new_cmd, wd_cnt)); 237 238 if (t->wd_hits) 239 qemu_irq_lower(t->nmi); 240 241 t->wd_hits = 0; 242 243 ptimer_transaction_begin(t->ptimer_wd); 244 ptimer_set_freq(t->ptimer_wd, 760); 245 if (wd_cnt == 0) 246 wd_cnt = 256; 247 ptimer_set_count(t->ptimer_wd, wd_cnt); 248 if (new_cmd) 249 ptimer_run(t->ptimer_wd, 1); 250 else 251 ptimer_stop(t->ptimer_wd); 252 253 t->rw_wd_ctrl = value; 254 ptimer_transaction_commit(t->ptimer_wd); 255 } 256 257 static void 258 timer_write(void *opaque, hwaddr addr, 259 uint64_t val64, unsigned int size) 260 { 261 ETRAXTimerState *t = opaque; 262 uint32_t value = val64; 263 264 switch (addr) 265 { 266 case RW_TMR0_DIV: 267 t->rw_tmr0_div = value; 268 break; 269 case RW_TMR0_CTRL: 270 D(printf ("RW_TMR0_CTRL=%x\n", value)); 271 t->rw_tmr0_ctrl = value; 272 update_ctrl(t, 0); 273 break; 274 case RW_TMR1_DIV: 275 t->rw_tmr1_div = value; 276 break; 277 case RW_TMR1_CTRL: 278 D(printf ("RW_TMR1_CTRL=%x\n", value)); 279 t->rw_tmr1_ctrl = value; 280 update_ctrl(t, 1); 281 break; 282 case RW_INTR_MASK: 283 D(printf ("RW_INTR_MASK=%x\n", value)); 284 t->rw_intr_mask = value; 285 timer_update_irq(t); 286 break; 287 case RW_WD_CTRL: 288 timer_watchdog_update(t, value); 289 break; 290 case RW_ACK_INTR: 291 t->rw_ack_intr = value; 292 timer_update_irq(t); 293 t->rw_ack_intr = 0; 294 break; 295 default: 296 printf ("%s " TARGET_FMT_plx " %x\n", 297 __func__, addr, value); 298 break; 299 } 300 } 301 302 static const MemoryRegionOps timer_ops = { 303 .read = timer_read, 304 .write = timer_write, 305 .endianness = DEVICE_LITTLE_ENDIAN, 306 .valid = { 307 .min_access_size = 4, 308 .max_access_size = 4 309 } 310 }; 311 312 static void etraxfs_timer_reset(void *opaque) 313 { 314 ETRAXTimerState *t = opaque; 315 316 ptimer_transaction_begin(t->ptimer_t0); 317 ptimer_stop(t->ptimer_t0); 318 ptimer_transaction_commit(t->ptimer_t0); 319 ptimer_transaction_begin(t->ptimer_t1); 320 ptimer_stop(t->ptimer_t1); 321 ptimer_transaction_commit(t->ptimer_t1); 322 ptimer_transaction_begin(t->ptimer_wd); 323 ptimer_stop(t->ptimer_wd); 324 ptimer_transaction_commit(t->ptimer_wd); 325 t->rw_wd_ctrl = 0; 326 t->r_intr = 0; 327 t->rw_intr_mask = 0; 328 qemu_irq_lower(t->irq); 329 } 330 331 static void etraxfs_timer_realize(DeviceState *dev, Error **errp) 332 { 333 ETRAXTimerState *t = ETRAX_TIMER(dev); 334 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 335 336 t->ptimer_t0 = ptimer_init(timer0_hit, t, PTIMER_POLICY_DEFAULT); 337 t->ptimer_t1 = ptimer_init(timer1_hit, t, PTIMER_POLICY_DEFAULT); 338 t->ptimer_wd = ptimer_init(watchdog_hit, t, PTIMER_POLICY_DEFAULT); 339 340 sysbus_init_irq(sbd, &t->irq); 341 sysbus_init_irq(sbd, &t->nmi); 342 343 memory_region_init_io(&t->mmio, OBJECT(t), &timer_ops, t, 344 "etraxfs-timer", 0x5c); 345 sysbus_init_mmio(sbd, &t->mmio); 346 qemu_register_reset(etraxfs_timer_reset, t); 347 } 348 349 static void etraxfs_timer_class_init(ObjectClass *klass, void *data) 350 { 351 DeviceClass *dc = DEVICE_CLASS(klass); 352 353 dc->realize = etraxfs_timer_realize; 354 } 355 356 static const TypeInfo etraxfs_timer_info = { 357 .name = TYPE_ETRAX_FS_TIMER, 358 .parent = TYPE_SYS_BUS_DEVICE, 359 .instance_size = sizeof(ETRAXTimerState), 360 .class_init = etraxfs_timer_class_init, 361 }; 362 363 static void etraxfs_timer_register_types(void) 364 { 365 type_register_static(&etraxfs_timer_info); 366 } 367 368 type_init(etraxfs_timer_register_types) 369