| 1 | /* dv-m68hc11tim.c -- Simulation of the 68HC11 timer devices. |
| 2 | Copyright (C) 1999-2020 Free Software Foundation, Inc. |
| 3 | Written by Stephane Carrez (stcarrez@nerim.fr) |
| 4 | (From a driver model Contributed by Cygnus Solutions.) |
| 5 | |
| 6 | This file is part of the program GDB, the GNU debugger. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 20 | |
| 21 | */ |
| 22 | |
| 23 | |
| 24 | #include "sim-main.h" |
| 25 | #include "hw-main.h" |
| 26 | #include "sim-assert.h" |
| 27 | #include <limits.h> |
| 28 | |
| 29 | /* DEVICE |
| 30 | |
| 31 | m68hc11tim - m68hc11 timer devices |
| 32 | |
| 33 | |
| 34 | DESCRIPTION |
| 35 | |
| 36 | Implements the m68hc11 timer as described in Chapter 10 |
| 37 | of the pink book. |
| 38 | |
| 39 | |
| 40 | PROPERTIES |
| 41 | |
| 42 | none |
| 43 | |
| 44 | |
| 45 | PORTS |
| 46 | |
| 47 | reset (input) |
| 48 | |
| 49 | Reset the timer device. This port must be connected to |
| 50 | the cpu-reset output port. |
| 51 | |
| 52 | capture (input) |
| 53 | |
| 54 | Input capture. This port must be connected to the input |
| 55 | captures. It latches the current TCNT free running counter |
| 56 | into one of the three input capture registers. |
| 57 | |
| 58 | */ |
| 59 | |
| 60 | |
| 61 | |
| 62 | /* port ID's */ |
| 63 | |
| 64 | enum |
| 65 | { |
| 66 | RESET_PORT, |
| 67 | CAPTURE |
| 68 | }; |
| 69 | |
| 70 | |
| 71 | static const struct hw_port_descriptor m68hc11tim_ports[] = |
| 72 | { |
| 73 | { "reset", RESET_PORT, 0, input_port, }, |
| 74 | { "capture", CAPTURE, 0, input_port, }, |
| 75 | { NULL, }, |
| 76 | }; |
| 77 | |
| 78 | |
| 79 | /* Timer Controller information. */ |
| 80 | struct m68hc11tim |
| 81 | { |
| 82 | unsigned long cop_delay; |
| 83 | unsigned long rti_delay; |
| 84 | unsigned long ovf_delay; |
| 85 | signed64 clock_prescaler; |
| 86 | signed64 tcnt_adjust; |
| 87 | signed64 cop_prev_interrupt; |
| 88 | signed64 rti_prev_interrupt; |
| 89 | |
| 90 | /* Periodic timers. */ |
| 91 | struct hw_event *rti_timer_event; |
| 92 | struct hw_event *cop_timer_event; |
| 93 | struct hw_event *tof_timer_event; |
| 94 | struct hw_event *cmp_timer_event; |
| 95 | }; |
| 96 | |
| 97 | |
| 98 | |
| 99 | /* Finish off the partially created hw device. Attach our local |
| 100 | callbacks. Wire up our port names etc. */ |
| 101 | |
| 102 | static hw_io_read_buffer_method m68hc11tim_io_read_buffer; |
| 103 | static hw_io_write_buffer_method m68hc11tim_io_write_buffer; |
| 104 | static hw_port_event_method m68hc11tim_port_event; |
| 105 | static hw_ioctl_method m68hc11tim_ioctl; |
| 106 | |
| 107 | #define M6811_TIMER_FIRST_REG (M6811_TCTN) |
| 108 | #define M6811_TIMER_LAST_REG (M6811_PACNT) |
| 109 | |
| 110 | |
| 111 | static void |
| 112 | attach_m68hc11tim_regs (struct hw *me, |
| 113 | struct m68hc11tim *controller) |
| 114 | { |
| 115 | hw_attach_address (hw_parent (me), M6811_IO_LEVEL, io_map, |
| 116 | M6811_TIMER_FIRST_REG, |
| 117 | M6811_TIMER_LAST_REG - M6811_TIMER_FIRST_REG + 1, |
| 118 | me); |
| 119 | } |
| 120 | |
| 121 | static void |
| 122 | m68hc11tim_finish (struct hw *me) |
| 123 | { |
| 124 | struct m68hc11tim *controller; |
| 125 | |
| 126 | controller = HW_ZALLOC (me, struct m68hc11tim); |
| 127 | set_hw_data (me, controller); |
| 128 | set_hw_io_read_buffer (me, m68hc11tim_io_read_buffer); |
| 129 | set_hw_io_write_buffer (me, m68hc11tim_io_write_buffer); |
| 130 | set_hw_ports (me, m68hc11tim_ports); |
| 131 | set_hw_port_event (me, m68hc11tim_port_event); |
| 132 | #ifdef set_hw_ioctl |
| 133 | set_hw_ioctl (me, m68hc11tim_ioctl); |
| 134 | #else |
| 135 | me->to_ioctl = m68hc11tim_ioctl; |
| 136 | #endif |
| 137 | |
| 138 | /* Preset defaults. */ |
| 139 | controller->clock_prescaler = 1; |
| 140 | controller->tcnt_adjust = 0; |
| 141 | |
| 142 | /* Attach ourself to our parent bus. */ |
| 143 | attach_m68hc11tim_regs (me, controller); |
| 144 | } |
| 145 | |
| 146 | |
| 147 | /* An event arrives on an interrupt port. */ |
| 148 | |
| 149 | static void |
| 150 | m68hc11tim_port_event (struct hw *me, |
| 151 | int my_port, |
| 152 | struct hw *source, |
| 153 | int source_port, |
| 154 | int level) |
| 155 | { |
| 156 | SIM_DESC sd; |
| 157 | struct m68hc11tim *controller; |
| 158 | sim_cpu *cpu; |
| 159 | unsigned8 val; |
| 160 | unsigned16 tcnt; |
| 161 | |
| 162 | controller = hw_data (me); |
| 163 | sd = hw_system (me); |
| 164 | cpu = STATE_CPU (sd, 0); |
| 165 | switch (my_port) |
| 166 | { |
| 167 | case RESET_PORT: |
| 168 | { |
| 169 | HW_TRACE ((me, "Timer reset")); |
| 170 | |
| 171 | /* Cancel all timer events. */ |
| 172 | if (controller->rti_timer_event) |
| 173 | { |
| 174 | hw_event_queue_deschedule (me, controller->rti_timer_event); |
| 175 | controller->rti_timer_event = 0; |
| 176 | controller->rti_prev_interrupt = 0; |
| 177 | } |
| 178 | if (controller->cop_timer_event) |
| 179 | { |
| 180 | hw_event_queue_deschedule (me, controller->cop_timer_event); |
| 181 | controller->cop_timer_event = 0; |
| 182 | controller->cop_prev_interrupt = 0; |
| 183 | } |
| 184 | if (controller->tof_timer_event) |
| 185 | { |
| 186 | hw_event_queue_deschedule (me, controller->tof_timer_event); |
| 187 | controller->tof_timer_event = 0; |
| 188 | } |
| 189 | if (controller->cmp_timer_event) |
| 190 | { |
| 191 | hw_event_queue_deschedule (me, controller->cmp_timer_event); |
| 192 | controller->cmp_timer_event = 0; |
| 193 | } |
| 194 | |
| 195 | /* Reset the state of Timer registers. This also restarts |
| 196 | the timer events (overflow and RTI clock). The pending |
| 197 | flags (TFLG2) must be cleared explicitly here. */ |
| 198 | val = 0; |
| 199 | cpu->ios[M6811_TFLG2] = 0; |
| 200 | m68hc11tim_io_write_buffer (me, &val, io_map, |
| 201 | (unsigned_word) M6811_TMSK2, 1); |
| 202 | m68hc11tim_io_write_buffer (me, &val, io_map, |
| 203 | (unsigned_word) M6811_PACTL, 1); |
| 204 | break; |
| 205 | } |
| 206 | |
| 207 | case CAPTURE: |
| 208 | tcnt = (uint16) ((cpu->cpu_absolute_cycle - controller->tcnt_adjust) |
| 209 | / controller->clock_prescaler); |
| 210 | switch (level) |
| 211 | { |
| 212 | case M6811_TIC1: |
| 213 | case M6811_TIC2: |
| 214 | case M6811_TIC3: |
| 215 | cpu->ios[level] = tcnt >> 8; |
| 216 | cpu->ios[level + 1] = tcnt; |
| 217 | break; |
| 218 | |
| 219 | default: |
| 220 | hw_abort (me, "Invalid event parameter %d", level); |
| 221 | break; |
| 222 | } |
| 223 | break; |
| 224 | |
| 225 | default: |
| 226 | hw_abort (me, "Event on unknown port %d", my_port); |
| 227 | break; |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | enum event_type |
| 232 | { |
| 233 | COP_EVENT, |
| 234 | RTI_EVENT, |
| 235 | OVERFLOW_EVENT, |
| 236 | COMPARE_EVENT |
| 237 | }; |
| 238 | |
| 239 | static void |
| 240 | m68hc11tim_timer_event (struct hw *me, void *data) |
| 241 | { |
| 242 | SIM_DESC sd; |
| 243 | struct m68hc11tim *controller; |
| 244 | sim_cpu *cpu; |
| 245 | enum event_type type; |
| 246 | unsigned long delay; |
| 247 | struct hw_event **eventp; |
| 248 | int check_interrupt = 0; |
| 249 | unsigned mask; |
| 250 | unsigned flags; |
| 251 | unsigned long tcnt_internal; |
| 252 | unsigned long tcnt, tcnt_prev; |
| 253 | signed64 tcnt_insn_end; |
| 254 | signed64 tcnt_insn_start; |
| 255 | int i; |
| 256 | sim_events *events; |
| 257 | |
| 258 | controller = hw_data (me); |
| 259 | sd = hw_system (me); |
| 260 | cpu = STATE_CPU (sd, 0); |
| 261 | type = (enum event_type) ((long) data) & 0x0FF; |
| 262 | events = STATE_EVENTS (sd); |
| 263 | |
| 264 | delay = 0; |
| 265 | switch (type) |
| 266 | { |
| 267 | case COP_EVENT: |
| 268 | eventp = &controller->cop_timer_event; |
| 269 | delay = controller->cop_delay; |
| 270 | delay = controller->cop_prev_interrupt + controller->cop_delay; |
| 271 | controller->cop_prev_interrupt = delay; |
| 272 | delay = delay - cpu->cpu_absolute_cycle; |
| 273 | check_interrupt = 1; |
| 274 | delay += events->nr_ticks_to_process; |
| 275 | break; |
| 276 | |
| 277 | case RTI_EVENT: |
| 278 | eventp = &controller->rti_timer_event; |
| 279 | delay = controller->rti_prev_interrupt + controller->rti_delay; |
| 280 | |
| 281 | if (((long) (data) & 0x0100) == 0) |
| 282 | { |
| 283 | cpu->ios[M6811_TFLG2] |= M6811_RTIF; |
| 284 | check_interrupt = 1; |
| 285 | controller->rti_prev_interrupt = delay; |
| 286 | delay += controller->rti_delay; |
| 287 | } |
| 288 | delay = delay - cpu->cpu_absolute_cycle; |
| 289 | delay += events->nr_ticks_to_process; |
| 290 | break; |
| 291 | |
| 292 | case OVERFLOW_EVENT: |
| 293 | /* Compute the 68HC11 internal free running counter. */ |
| 294 | tcnt_internal = (cpu->cpu_absolute_cycle - controller->tcnt_adjust); |
| 295 | |
| 296 | /* We must take into account the prescaler that comes |
| 297 | before the counter (it's a power of 2). */ |
| 298 | tcnt_internal &= 0x0ffff * controller->clock_prescaler; |
| 299 | |
| 300 | /* Compute the time when the overflow will occur. It occurs when |
| 301 | the counter increments from 0x0ffff to 0x10000 (and thus resets). */ |
| 302 | delay = (0x10000 * controller->clock_prescaler) - tcnt_internal; |
| 303 | |
| 304 | /* The 'nr_ticks_to_process' will be subtracted when the event |
| 305 | is scheduled. */ |
| 306 | delay += events->nr_ticks_to_process; |
| 307 | |
| 308 | eventp = &controller->tof_timer_event; |
| 309 | if (((long) (data) & 0x100) == 0) |
| 310 | { |
| 311 | cpu->ios[M6811_TFLG2] |= M6811_TOF; |
| 312 | check_interrupt = 1; |
| 313 | } |
| 314 | break; |
| 315 | |
| 316 | case COMPARE_EVENT: |
| 317 | /* Compute value of TCNT register (64-bit precision) at beginning |
| 318 | and end of instruction. */ |
| 319 | tcnt_insn_end = (cpu->cpu_absolute_cycle - controller->tcnt_adjust); |
| 320 | tcnt_insn_start = (tcnt_insn_end - cpu->cpu_current_cycle); |
| 321 | |
| 322 | /* TCNT value at beginning of current instruction. */ |
| 323 | tcnt_prev = (tcnt_insn_start / controller->clock_prescaler) & 0x0ffff; |
| 324 | |
| 325 | /* TCNT value at end of current instruction. */ |
| 326 | tcnt = (tcnt_insn_end / controller->clock_prescaler) & 0x0ffff; |
| 327 | |
| 328 | /* We must take into account the prescaler that comes |
| 329 | before the counter (it's a power of 2). */ |
| 330 | tcnt_internal = tcnt_insn_end; |
| 331 | tcnt_internal &= 0x0ffff * controller->clock_prescaler; |
| 332 | |
| 333 | flags = cpu->ios[M6811_TMSK1]; |
| 334 | mask = 0x80; |
| 335 | delay = 65536 * controller->clock_prescaler; |
| 336 | |
| 337 | /* Scan each output compare register to see if one matches |
| 338 | the free running counter. Set the corresponding OCi flag |
| 339 | if the output compare is enabled. */ |
| 340 | for (i = M6811_TOC1; i <= M6811_TOC5; i += 2, mask >>= 1) |
| 341 | { |
| 342 | unsigned long compare; |
| 343 | |
| 344 | compare = (cpu->ios[i] << 8) + cpu->ios[i + 1]; |
| 345 | |
| 346 | /* See if compare is reached; handle wrap arround. */ |
| 347 | if ((compare >= tcnt_prev && compare <= tcnt && tcnt_prev < tcnt) |
| 348 | || (compare >= tcnt_prev && tcnt_prev > tcnt) |
| 349 | || (compare < tcnt && tcnt_prev > tcnt)) |
| 350 | { |
| 351 | unsigned dt; |
| 352 | |
| 353 | if (compare > tcnt) |
| 354 | dt = 0x10000 - compare - tcnt; |
| 355 | else |
| 356 | dt = tcnt - compare; |
| 357 | |
| 358 | cpu->ios[M6811_TFLG1] |= mask; |
| 359 | |
| 360 | /* Raise interrupt now at the correct CPU cycle so that |
| 361 | we can find the interrupt latency. */ |
| 362 | cpu->cpu_absolute_cycle -= dt; |
| 363 | interrupts_update_pending (&cpu->cpu_interrupts); |
| 364 | cpu->cpu_absolute_cycle += dt; |
| 365 | } |
| 366 | |
| 367 | /* Compute how many times for the next match. |
| 368 | Use the internal counter value to take into account the |
| 369 | prescaler accurately. */ |
| 370 | compare = compare * controller->clock_prescaler; |
| 371 | if (compare > tcnt_internal) |
| 372 | compare = compare - tcnt_internal; |
| 373 | else |
| 374 | compare = compare - tcnt_internal |
| 375 | + 65536 * controller->clock_prescaler; |
| 376 | |
| 377 | if (compare < delay) |
| 378 | delay = compare; |
| 379 | } |
| 380 | |
| 381 | /* Deactivate the compare timer if no output compare is enabled. */ |
| 382 | if ((flags & 0xF8) == 0) |
| 383 | delay = 0; |
| 384 | else |
| 385 | delay += events->nr_ticks_to_process; |
| 386 | |
| 387 | eventp = &controller->cmp_timer_event; |
| 388 | break; |
| 389 | |
| 390 | default: |
| 391 | eventp = 0; |
| 392 | break; |
| 393 | } |
| 394 | |
| 395 | if (*eventp) |
| 396 | { |
| 397 | hw_event_queue_deschedule (me, *eventp); |
| 398 | *eventp = 0; |
| 399 | } |
| 400 | |
| 401 | if (delay != 0) |
| 402 | { |
| 403 | *eventp = hw_event_queue_schedule (me, delay, |
| 404 | m68hc11tim_timer_event, |
| 405 | (void*) type); |
| 406 | } |
| 407 | |
| 408 | if (check_interrupt) |
| 409 | interrupts_update_pending (&cpu->cpu_interrupts); |
| 410 | } |
| 411 | |
| 412 | |
| 413 | /* Descriptions of the Timer I/O ports. These descriptions are only used to |
| 414 | give information of the Timer device under GDB. */ |
| 415 | io_reg_desc tmsk1_desc[] = { |
| 416 | { M6811_OC1I, "OC1I ", "Timer Output Compare 1 Interrupt Enable" }, |
| 417 | { M6811_OC2I, "OC2I ", "Timer Output Compare 2 Interrupt Enable" }, |
| 418 | { M6811_OC3I, "OC3I ", "Timer Output Compare 3 Interrupt Enable" }, |
| 419 | { M6811_OC4I, "OC4I ", "Timer Output Compare 4 Interrupt Enable" }, |
| 420 | { M6811_OC5I, "OC5I ", "Timer Input Capture 4 / Output Compare 5 Enable" }, |
| 421 | { M6811_IC1I, "IC1I ", "Timer Input Capture 1 Interrupt Enable" }, |
| 422 | { M6811_IC2I, "IC2I ", "Timer Input Capture 2 Interrupt Enable" }, |
| 423 | { M6811_IC3I, "IC3I ", "Timer Input Capture 3 Interrupt Enable" }, |
| 424 | { 0, 0, 0 } |
| 425 | }; |
| 426 | |
| 427 | io_reg_desc tflg1_desc[] = { |
| 428 | { M6811_OC1F, "OC1F ", "Timer Output Compare 1 Interrupt Flag" }, |
| 429 | { M6811_OC2F, "OC2F ", "Timer Output Compare 2 Interrupt Flag" }, |
| 430 | { M6811_OC3F, "OC3F ", "Timer Output Compare 3 Interrupt Flag" }, |
| 431 | { M6811_OC4F, "OC4F ", "Timer Output Compare 4 Interrupt Flag" }, |
| 432 | { M6811_OC5F, "OC5F ", "Timer Input Capture 4 / Output Compare 5 Flag" }, |
| 433 | { M6811_IC1F, "IC1F ", "Timer Input Capture 1 Interrupt Flag" }, |
| 434 | { M6811_IC2F, "IC2F ", "Timer Input Capture 2 Interrupt Flag" }, |
| 435 | { M6811_IC3F, "IC3F ", "Timer Input Capture 3 Interrupt Flag" }, |
| 436 | { 0, 0, 0 } |
| 437 | }; |
| 438 | |
| 439 | io_reg_desc tmsk2_desc[] = { |
| 440 | { M6811_TOI, "TOI ", "Timer Overflow Interrupt Enable" }, |
| 441 | { M6811_RTII, "RTII ", "RTI Interrupt Enable" }, |
| 442 | { M6811_PAOVI, "PAOVI ", "Pulse Accumulator Overflow Interrupt Enable" }, |
| 443 | { M6811_PAII, "PAII ", "Pulse Accumulator Interrupt Enable" }, |
| 444 | { M6811_PR1, "PR1 ", "Timer prescaler (PR1)" }, |
| 445 | { M6811_PR0, "PR0 ", "Timer prescaler (PR0)" }, |
| 446 | { M6811_TPR_1, "TPR_1 ", "Timer prescaler div 1" }, |
| 447 | { M6811_TPR_4, "TPR_4 ", "Timer prescaler div 4" }, |
| 448 | { M6811_TPR_8, "TPR_8 ", "Timer prescaler div 8" }, |
| 449 | { M6811_TPR_16, "TPR_16", "Timer prescaler div 16" }, |
| 450 | { 0, 0, 0 } |
| 451 | }; |
| 452 | |
| 453 | io_reg_desc tflg2_desc[] = { |
| 454 | { M6811_TOF, "TOF ", "Timer Overflow Bit" }, |
| 455 | { M6811_RTIF, "RTIF ", "Read Time Interrupt Flag" }, |
| 456 | { M6811_PAOVF, "PAOVF ", "Pulse Accumulator Overflow Interrupt Flag" }, |
| 457 | { M6811_PAIF, "PAIF ", "Pulse Accumulator Input Edge" }, |
| 458 | { 0, 0, 0 } |
| 459 | }; |
| 460 | |
| 461 | io_reg_desc pactl_desc[] = { |
| 462 | { M6811_DDRA7, "DDRA7 ", "Data Direction for Port A bit-7" }, |
| 463 | { M6811_PAEN, "PAEN ", "Pulse Accumulator System Enable" }, |
| 464 | { M6811_PAMOD, "PAMOD ", "Pulse Accumulator Mode" }, |
| 465 | { M6811_PEDGE, "PEDGE ", "Pulse Accumulator Edge Control" }, |
| 466 | { M6811_RTR1, "RTR1 ", "RTI Interrupt rate select (RTR1)" }, |
| 467 | { M6811_RTR0, "RTR0 ", "RTI Interrupt rate select (RTR0)" }, |
| 468 | { 0, 0, 0 } |
| 469 | }; |
| 470 | |
| 471 | static double |
| 472 | to_realtime (sim_cpu *cpu, signed64 t) |
| 473 | { |
| 474 | return (double) (t) / (double) (cpu->cpu_frequency / 4); |
| 475 | } |
| 476 | |
| 477 | const char* |
| 478 | cycle_to_string (sim_cpu *cpu, signed64 t, int flags) |
| 479 | { |
| 480 | char time_buf[32]; |
| 481 | char cycle_buf[32]; |
| 482 | static char buf[64]; |
| 483 | |
| 484 | time_buf[0] = 0; |
| 485 | cycle_buf[0] = 0; |
| 486 | if (flags & PRINT_TIME) |
| 487 | { |
| 488 | double dt; |
| 489 | |
| 490 | dt = to_realtime (cpu, t); |
| 491 | if (dt < 0.001) |
| 492 | sprintf (time_buf, " (%3.1f us)", dt * 1000000.0); |
| 493 | else if (dt < 1.0) |
| 494 | sprintf (time_buf, " (%3.1f ms)", dt * 1000.0); |
| 495 | else |
| 496 | sprintf (time_buf, " (%3.1f s)", dt); |
| 497 | } |
| 498 | |
| 499 | if (flags & PRINT_CYCLE) |
| 500 | sprintf (cycle_buf, " cycle%s", |
| 501 | (t > 1 ? "s" : "")); |
| 502 | |
| 503 | if (t < LONG_MAX) |
| 504 | sprintf (buf, "%9lu%s%s", (unsigned long) t, cycle_buf, time_buf); |
| 505 | else |
| 506 | sprintf (buf, "%llu%s%s", t, cycle_buf, time_buf); |
| 507 | return buf; |
| 508 | } |
| 509 | |
| 510 | static void |
| 511 | m68hc11tim_print_timer (struct hw *me, const char *name, |
| 512 | struct hw_event *event) |
| 513 | { |
| 514 | SIM_DESC sd; |
| 515 | |
| 516 | sd = hw_system (me); |
| 517 | if (event == 0) |
| 518 | { |
| 519 | sim_io_printf (sd, " No %s interrupt will be raised.\n", name); |
| 520 | } |
| 521 | else |
| 522 | { |
| 523 | signed64 t; |
| 524 | sim_cpu *cpu; |
| 525 | |
| 526 | cpu = STATE_CPU (sd, 0); |
| 527 | |
| 528 | t = hw_event_remain_time (me, event); |
| 529 | sim_io_printf (sd, " Next %s interrupt in %s\n", |
| 530 | name, cycle_to_string (cpu, t, PRINT_TIME | PRINT_CYCLE)); |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | static void |
| 535 | m68hc11tim_info (struct hw *me) |
| 536 | { |
| 537 | SIM_DESC sd; |
| 538 | uint16 base = 0; |
| 539 | sim_cpu *cpu; |
| 540 | struct m68hc11tim *controller; |
| 541 | uint8 val; |
| 542 | uint16 val16; |
| 543 | |
| 544 | sd = hw_system (me); |
| 545 | cpu = STATE_CPU (sd, 0); |
| 546 | controller = hw_data (me); |
| 547 | |
| 548 | sim_io_printf (sd, "M68HC11 Timer:\n"); |
| 549 | |
| 550 | base = cpu_get_io_base (cpu); |
| 551 | |
| 552 | /* Info for TIC1 */ |
| 553 | val16 = (cpu->ios[M6811_TIC1_H] << 8) + cpu->ios[M6811_TIC1_L]; |
| 554 | print_io_word (sd, "TIC1 ", 0, val16, base + M6811_TIC1); |
| 555 | sim_io_printf (sd, "\n"); |
| 556 | |
| 557 | /* Info for TIC2 */ |
| 558 | val16 = (cpu->ios[M6811_TIC2_H] << 8) + cpu->ios[M6811_TIC2_L]; |
| 559 | print_io_word (sd, "TIC2 ", 0, val16, base + M6811_TIC2); |
| 560 | sim_io_printf (sd, "\n"); |
| 561 | |
| 562 | /* Info for TIC3 */ |
| 563 | val16 = (cpu->ios[M6811_TIC3_H] << 8) + cpu->ios[M6811_TIC3_L]; |
| 564 | print_io_word (sd, "TIC3 ", 0, val16, base + M6811_TIC3); |
| 565 | sim_io_printf (sd, "\n"); |
| 566 | |
| 567 | /* Info for TOC1 */ |
| 568 | val16 = (cpu->ios[M6811_TOC1_H] << 8) + cpu->ios[M6811_TOC1_L]; |
| 569 | print_io_word (sd, "TOC1 ", 0, val16, base + M6811_TOC1); |
| 570 | sim_io_printf (sd, "\n"); |
| 571 | |
| 572 | /* Info for TOC2 */ |
| 573 | val16 = (cpu->ios[M6811_TOC2_H] << 8) + cpu->ios[M6811_TOC2_L]; |
| 574 | print_io_word (sd, "TOC2 ", 0, val16, base + M6811_TOC2); |
| 575 | sim_io_printf (sd, "\n"); |
| 576 | |
| 577 | /* Info for TOC3 */ |
| 578 | val16 = (cpu->ios[M6811_TOC3_H] << 8) + cpu->ios[M6811_TOC3_L]; |
| 579 | print_io_word (sd, "TOC3 ", 0, val16, base + M6811_TOC3); |
| 580 | sim_io_printf (sd, "\n"); |
| 581 | |
| 582 | /* Info for TOC4 */ |
| 583 | val16 = (cpu->ios[M6811_TOC4_H] << 8) + cpu->ios[M6811_TOC4_L]; |
| 584 | print_io_word (sd, "TOC4 ", 0, val16, base + M6811_TOC4); |
| 585 | sim_io_printf (sd, "\n"); |
| 586 | |
| 587 | /* Info for TOC5 */ |
| 588 | val16 = (cpu->ios[M6811_TOC5_H] << 8) + cpu->ios[M6811_TOC5_L]; |
| 589 | print_io_word (sd, "TOC5 ", 0, val16, base + M6811_TOC5); |
| 590 | sim_io_printf (sd, "\n"); |
| 591 | |
| 592 | /* Info for TMSK1 */ |
| 593 | val = cpu->ios[M6811_TMSK1]; |
| 594 | print_io_byte (sd, "TMSK1 ", tmsk1_desc, val, base + M6811_TMSK1); |
| 595 | sim_io_printf (sd, "\n"); |
| 596 | |
| 597 | /* Info for TFLG1 */ |
| 598 | val = cpu->ios[M6811_TFLG1]; |
| 599 | print_io_byte (sd, "TFLG1", tflg1_desc, val, base + M6811_TFLG1); |
| 600 | sim_io_printf (sd, "\n"); |
| 601 | |
| 602 | val = cpu->ios[M6811_TMSK2]; |
| 603 | print_io_byte (sd, "TMSK2 ", tmsk2_desc, val, base + M6811_TMSK2); |
| 604 | sim_io_printf (sd, "\n"); |
| 605 | |
| 606 | val = cpu->ios[M6811_TFLG2]; |
| 607 | print_io_byte (sd, "TFLG2", tflg2_desc, val, base + M6811_TFLG2); |
| 608 | sim_io_printf (sd, "\n"); |
| 609 | |
| 610 | val = cpu->ios[M6811_PACTL]; |
| 611 | print_io_byte (sd, "PACTL", pactl_desc, val, base + M6811_PACTL); |
| 612 | sim_io_printf (sd, "\n"); |
| 613 | |
| 614 | val = cpu->ios[M6811_PACNT]; |
| 615 | print_io_byte (sd, "PACNT", 0, val, base + M6811_PACNT); |
| 616 | sim_io_printf (sd, "\n"); |
| 617 | |
| 618 | /* Give info about the next timer interrupts. */ |
| 619 | m68hc11tim_print_timer (me, "RTI", controller->rti_timer_event); |
| 620 | m68hc11tim_print_timer (me, "COP", controller->cop_timer_event); |
| 621 | m68hc11tim_print_timer (me, "OVERFLOW", controller->tof_timer_event); |
| 622 | m68hc11tim_print_timer (me, "COMPARE", controller->cmp_timer_event); |
| 623 | } |
| 624 | |
| 625 | static int |
| 626 | m68hc11tim_ioctl (struct hw *me, |
| 627 | hw_ioctl_request request, |
| 628 | va_list ap) |
| 629 | { |
| 630 | m68hc11tim_info (me); |
| 631 | return 0; |
| 632 | } |
| 633 | |
| 634 | /* generic read/write */ |
| 635 | |
| 636 | static unsigned |
| 637 | m68hc11tim_io_read_buffer (struct hw *me, |
| 638 | void *dest, |
| 639 | int space, |
| 640 | unsigned_word base, |
| 641 | unsigned nr_bytes) |
| 642 | { |
| 643 | SIM_DESC sd; |
| 644 | struct m68hc11tim *controller; |
| 645 | sim_cpu *cpu; |
| 646 | unsigned8 val; |
| 647 | unsigned cnt = 0; |
| 648 | |
| 649 | HW_TRACE ((me, "read 0x%08lx %d", (long) base, (int) nr_bytes)); |
| 650 | |
| 651 | sd = hw_system (me); |
| 652 | cpu = STATE_CPU (sd, 0); |
| 653 | controller = hw_data (me); |
| 654 | |
| 655 | while (nr_bytes) |
| 656 | { |
| 657 | switch (base) |
| 658 | { |
| 659 | /* The cpu_absolute_cycle is updated after each instruction. |
| 660 | Reading in a 16-bit register will be split in two accesses |
| 661 | but this will be atomic within the simulator. */ |
| 662 | case M6811_TCTN_H: |
| 663 | val = (uint8) ((cpu->cpu_absolute_cycle - controller->tcnt_adjust) |
| 664 | / (controller->clock_prescaler * 256)); |
| 665 | break; |
| 666 | |
| 667 | case M6811_TCTN_L: |
| 668 | val = (uint8) ((cpu->cpu_absolute_cycle - controller->tcnt_adjust) |
| 669 | / controller->clock_prescaler); |
| 670 | break; |
| 671 | |
| 672 | default: |
| 673 | val = cpu->ios[base]; |
| 674 | break; |
| 675 | } |
| 676 | *((unsigned8*) dest) = val; |
| 677 | dest = (char*) dest + 1; |
| 678 | base++; |
| 679 | nr_bytes--; |
| 680 | cnt++; |
| 681 | } |
| 682 | return cnt; |
| 683 | } |
| 684 | |
| 685 | static unsigned |
| 686 | m68hc11tim_io_write_buffer (struct hw *me, |
| 687 | const void *source, |
| 688 | int space, |
| 689 | unsigned_word base, |
| 690 | unsigned nr_bytes) |
| 691 | { |
| 692 | SIM_DESC sd; |
| 693 | struct m68hc11tim *controller; |
| 694 | sim_cpu *cpu; |
| 695 | unsigned8 val, n; |
| 696 | signed64 adj; |
| 697 | int reset_compare = 0; |
| 698 | int reset_overflow = 0; |
| 699 | int cnt = 0; |
| 700 | |
| 701 | HW_TRACE ((me, "write 0x%08lx %d", (long) base, (int) nr_bytes)); |
| 702 | |
| 703 | sd = hw_system (me); |
| 704 | cpu = STATE_CPU (sd, 0); |
| 705 | controller = hw_data (me); |
| 706 | |
| 707 | while (nr_bytes) |
| 708 | { |
| 709 | val = *((const unsigned8*) source); |
| 710 | switch (base) |
| 711 | { |
| 712 | /* Set the timer counter low part, trying to preserve the low part. |
| 713 | We compute the absolute cycle adjustment that we have to apply |
| 714 | to obtain the timer current value. Computation must be made |
| 715 | in 64-bit to avoid overflow problems. */ |
| 716 | case M6811_TCTN_L: |
| 717 | adj = ((cpu->cpu_absolute_cycle - controller->tcnt_adjust) |
| 718 | / (controller->clock_prescaler * (signed64) 256)) & 0x0FF; |
| 719 | adj = cpu->cpu_absolute_cycle |
| 720 | - (adj * controller->clock_prescaler * (signed64) 256) |
| 721 | - ((signed64) adj * controller->clock_prescaler); |
| 722 | controller->tcnt_adjust = adj; |
| 723 | reset_compare = 1; |
| 724 | reset_overflow = 1; |
| 725 | break; |
| 726 | |
| 727 | case M6811_TCTN_H: |
| 728 | adj = ((cpu->cpu_absolute_cycle - controller->tcnt_adjust) |
| 729 | / controller->clock_prescaler) & 0x0ff; |
| 730 | adj = cpu->cpu_absolute_cycle |
| 731 | - ((signed64) val * controller->clock_prescaler * (signed64) 256) |
| 732 | - (adj * controller->clock_prescaler); |
| 733 | controller->tcnt_adjust = adj; |
| 734 | reset_compare = 1; |
| 735 | reset_overflow = 1; |
| 736 | break; |
| 737 | |
| 738 | case M6811_TMSK2: |
| 739 | |
| 740 | /* Timer prescaler cannot be changed after 64 bus cycles. */ |
| 741 | if (cpu->cpu_absolute_cycle >= 64) |
| 742 | { |
| 743 | val &= ~(M6811_PR1 | M6811_PR0); |
| 744 | val |= cpu->ios[M6811_TMSK2] & (M6811_PR1 | M6811_PR0); |
| 745 | } |
| 746 | switch (val & (M6811_PR1 | M6811_PR0)) |
| 747 | { |
| 748 | case 0: |
| 749 | n = 1; |
| 750 | break; |
| 751 | case M6811_PR0: |
| 752 | n = 4; |
| 753 | break; |
| 754 | case M6811_PR1: |
| 755 | n = 8; |
| 756 | break; |
| 757 | default: |
| 758 | case M6811_PR1 | M6811_PR0: |
| 759 | n = 16; |
| 760 | break; |
| 761 | } |
| 762 | if (cpu->cpu_absolute_cycle < 64) |
| 763 | { |
| 764 | reset_overflow = 1; |
| 765 | controller->clock_prescaler = n; |
| 766 | } |
| 767 | cpu->ios[base] = val; |
| 768 | interrupts_update_pending (&cpu->cpu_interrupts); |
| 769 | break; |
| 770 | |
| 771 | case M6811_PACTL: |
| 772 | n = (1 << ((val & (M6811_RTR1 | M6811_RTR0)))); |
| 773 | cpu->ios[base] = val; |
| 774 | |
| 775 | controller->rti_delay = (long) (n) * 8192; |
| 776 | m68hc11tim_timer_event (me, (void*) (RTI_EVENT| 0x100)); |
| 777 | break; |
| 778 | |
| 779 | case M6811_TFLG2: |
| 780 | val &= cpu->ios[M6811_TFLG2]; |
| 781 | cpu->ios[M6811_TFLG2] &= ~val; |
| 782 | interrupts_update_pending (&cpu->cpu_interrupts); |
| 783 | break; |
| 784 | |
| 785 | case M6811_TMSK1: |
| 786 | cpu->ios[M6811_TMSK1] = val; |
| 787 | interrupts_update_pending (&cpu->cpu_interrupts); |
| 788 | reset_compare = 1; |
| 789 | break; |
| 790 | |
| 791 | case M6811_TFLG1: |
| 792 | val &= cpu->ios[M6811_TFLG1]; |
| 793 | cpu->ios[M6811_TFLG1] &= ~val; |
| 794 | interrupts_update_pending (&cpu->cpu_interrupts); |
| 795 | break; |
| 796 | |
| 797 | case M6811_TOC1: |
| 798 | case M6811_TOC2: |
| 799 | case M6811_TOC3: |
| 800 | case M6811_TOC4: |
| 801 | case M6811_TOC5: |
| 802 | cpu->ios[base] = val; |
| 803 | reset_compare = 1; |
| 804 | break; |
| 805 | |
| 806 | case M6811_TCTL1: |
| 807 | case M6811_TCTL2: |
| 808 | cpu->ios[base] = val; |
| 809 | break; |
| 810 | |
| 811 | default: |
| 812 | cpu->ios[base] = val; |
| 813 | break; |
| 814 | } |
| 815 | |
| 816 | base++; |
| 817 | nr_bytes--; |
| 818 | cnt++; |
| 819 | source = (char*) source + 1; |
| 820 | } |
| 821 | |
| 822 | /* Re-compute the next timer compare event. */ |
| 823 | if (reset_compare) |
| 824 | { |
| 825 | m68hc11tim_timer_event (me, (void*) (COMPARE_EVENT)); |
| 826 | } |
| 827 | if (reset_overflow) |
| 828 | { |
| 829 | m68hc11tim_timer_event (me, (void*) (OVERFLOW_EVENT| 0x100)); |
| 830 | } |
| 831 | return cnt; |
| 832 | } |
| 833 | |
| 834 | |
| 835 | const struct hw_descriptor dv_m68hc11tim_descriptor[] = { |
| 836 | { "m68hc11tim", m68hc11tim_finish }, |
| 837 | { "m68hc12tim", m68hc11tim_finish }, |
| 838 | { NULL }, |
| 839 | }; |
| 840 | |