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e0709f50 | 1 | /* dv-m68hc11sio.c -- Simulation of the 68HC11 serial device. |
ecd75fc8 | 2 | Copyright (C) 1999-2014 Free Software Foundation, Inc. |
e0709f50 AC |
3 | Written by Stephane Carrez (stcarrez@worldnet.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 | |
4744ac1b | 10 | the Free Software Foundation; either version 3 of the License, or |
e0709f50 | 11 | (at your option) any later version. |
4744ac1b | 12 | |
e0709f50 AC |
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. | |
4744ac1b | 17 | |
e0709f50 | 18 | You should have received a copy of the GNU General Public License |
4744ac1b | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
e0709f50 AC |
20 | |
21 | */ | |
22 | ||
23 | ||
24 | #include "sim-main.h" | |
25 | #include "hw-main.h" | |
26 | #include "dv-sockser.h" | |
27 | #include "sim-assert.h" | |
28 | ||
29 | ||
30 | /* DEVICE | |
31 | ||
32 | m68hc11sio - m68hc11 serial I/O | |
33 | ||
34 | ||
35 | DESCRIPTION | |
36 | ||
37 | Implements the m68hc11 serial I/O controller described in the m68hc11 | |
38 | user guide. The serial I/O controller is directly connected to the CPU | |
39 | interrupt. The simulator implements: | |
40 | ||
41 | - baud rate emulation | |
42 | - 8-bits transfers | |
43 | ||
44 | PROPERTIES | |
45 | ||
46 | backend {tcp | stdio} | |
47 | ||
48 | Use dv-sockser TCP-port backend or stdio for backend. Default: stdio. | |
49 | ||
50 | ||
51 | PORTS | |
52 | ||
53 | reset (input) | |
54 | ||
55 | Reset port. This port is only used to simulate a reset of the serial | |
56 | I/O controller. It should be connected to the RESET output of the cpu. | |
57 | ||
58 | */ | |
59 | ||
60 | ||
61 | ||
62 | /* port ID's */ | |
63 | ||
64 | enum | |
65 | { | |
66 | RESET_PORT | |
67 | }; | |
68 | ||
69 | ||
70 | static const struct hw_port_descriptor m68hc11sio_ports[] = | |
71 | { | |
72 | { "reset", RESET_PORT, 0, input_port, }, | |
73 | { NULL, }, | |
74 | }; | |
75 | ||
76 | ||
77 | /* Serial Controller information. */ | |
78 | struct m68hc11sio | |
79 | { | |
80 | enum {sio_tcp, sio_stdio} backend; /* backend */ | |
81 | ||
82 | /* Number of cpu cycles to send a bit on the wire. */ | |
83 | unsigned long baud_cycle; | |
84 | ||
85 | /* Length in bits of characters sent, this includes the | |
86 | start/stop and parity bits. Together with baud_cycle, this | |
87 | is used to find the number of cpu cycles to send/receive a data. */ | |
88 | unsigned int data_length; | |
89 | ||
90 | /* Information about next character to be transmited. */ | |
91 | unsigned char tx_has_char; | |
92 | unsigned char tx_char; | |
93 | ||
94 | unsigned char rx_char; | |
95 | unsigned char rx_clear_scsr; | |
96 | ||
97 | /* Periodic I/O polling. */ | |
98 | struct hw_event* tx_poll_event; | |
99 | struct hw_event* rx_poll_event; | |
100 | }; | |
101 | ||
102 | ||
103 | ||
104 | /* Finish off the partially created hw device. Attach our local | |
105 | callbacks. Wire up our port names etc. */ | |
106 | ||
107 | static hw_io_read_buffer_method m68hc11sio_io_read_buffer; | |
108 | static hw_io_write_buffer_method m68hc11sio_io_write_buffer; | |
109 | static hw_port_event_method m68hc11sio_port_event; | |
110 | static hw_ioctl_method m68hc11sio_ioctl; | |
111 | ||
112 | #define M6811_SCI_FIRST_REG (M6811_BAUD) | |
113 | #define M6811_SCI_LAST_REG (M6811_SCDR) | |
114 | ||
115 | ||
116 | static void | |
117 | attach_m68hc11sio_regs (struct hw *me, | |
118 | struct m68hc11sio *controller) | |
119 | { | |
63348d04 | 120 | hw_attach_address (hw_parent (me), M6811_IO_LEVEL, io_map, |
e0709f50 AC |
121 | M6811_SCI_FIRST_REG, |
122 | M6811_SCI_LAST_REG - M6811_SCI_FIRST_REG + 1, | |
123 | me); | |
124 | ||
125 | if (hw_find_property(me, "backend") != NULL) | |
126 | { | |
127 | const char *value = hw_find_string_property(me, "backend"); | |
128 | if(! strcmp(value, "tcp")) | |
129 | controller->backend = sio_tcp; | |
130 | else if(! strcmp(value, "stdio")) | |
131 | controller->backend = sio_stdio; | |
132 | else | |
133 | hw_abort (me, "illegal value for backend parameter `%s':" | |
134 | "use tcp or stdio", value); | |
135 | } | |
136 | } | |
137 | ||
138 | ||
139 | static void | |
140 | m68hc11sio_finish (struct hw *me) | |
141 | { | |
142 | struct m68hc11sio *controller; | |
143 | ||
144 | controller = HW_ZALLOC (me, struct m68hc11sio); | |
e0709f50 AC |
145 | set_hw_data (me, controller); |
146 | set_hw_io_read_buffer (me, m68hc11sio_io_read_buffer); | |
147 | set_hw_io_write_buffer (me, m68hc11sio_io_write_buffer); | |
148 | set_hw_ports (me, m68hc11sio_ports); | |
149 | set_hw_port_event (me, m68hc11sio_port_event); | |
150 | #ifdef set_hw_ioctl | |
151 | set_hw_ioctl (me, m68hc11sio_ioctl); | |
152 | #else | |
153 | me->to_ioctl = m68hc11sio_ioctl; | |
154 | #endif | |
155 | ||
156 | /* Preset defaults. */ | |
157 | controller->backend = sio_stdio; | |
158 | ||
159 | /* Attach ourself to our parent bus. */ | |
160 | attach_m68hc11sio_regs (me, controller); | |
161 | ||
162 | /* Initialize to reset state. */ | |
163 | controller->tx_poll_event = NULL; | |
164 | controller->rx_poll_event = NULL; | |
165 | controller->tx_char = 0; | |
166 | controller->tx_has_char = 0; | |
167 | controller->rx_clear_scsr = 0; | |
168 | controller->rx_char = 0; | |
169 | } | |
170 | ||
171 | ||
172 | ||
173 | /* An event arrives on an interrupt port. */ | |
174 | ||
175 | static void | |
176 | m68hc11sio_port_event (struct hw *me, | |
177 | int my_port, | |
178 | struct hw *source, | |
179 | int source_port, | |
180 | int level) | |
181 | { | |
182 | SIM_DESC sd; | |
183 | struct m68hc11sio *controller; | |
184 | sim_cpu *cpu; | |
185 | unsigned8 val; | |
186 | ||
187 | controller = hw_data (me); | |
188 | sd = hw_system (me); | |
189 | cpu = STATE_CPU (sd, 0); | |
190 | switch (my_port) | |
191 | { | |
192 | case RESET_PORT: | |
193 | { | |
194 | HW_TRACE ((me, "SCI reset")); | |
195 | ||
196 | /* Reset the state of SCI registers. */ | |
197 | val = 0; | |
198 | m68hc11sio_io_write_buffer (me, &val, io_map, | |
199 | (unsigned_word) M6811_BAUD, 1); | |
200 | m68hc11sio_io_write_buffer (me, &val, io_map, | |
201 | (unsigned_word) M6811_SCCR1, 1); | |
202 | m68hc11sio_io_write_buffer (me, &val, io_map, | |
203 | (unsigned_word) M6811_SCCR2, 1); | |
204 | ||
205 | cpu->ios[M6811_SCSR] = M6811_TC | M6811_TDRE; | |
206 | controller->rx_char = 0; | |
207 | controller->tx_char = 0; | |
208 | controller->tx_has_char = 0; | |
209 | controller->rx_clear_scsr = 0; | |
210 | if (controller->rx_poll_event) | |
211 | { | |
212 | hw_event_queue_deschedule (me, controller->rx_poll_event); | |
213 | controller->rx_poll_event = 0; | |
214 | } | |
215 | if (controller->tx_poll_event) | |
216 | { | |
217 | hw_event_queue_deschedule (me, controller->tx_poll_event); | |
218 | controller->tx_poll_event = 0; | |
219 | } | |
220 | ||
221 | /* In bootstrap mode, initialize the SCI to 1200 bauds to | |
222 | simulate some initial setup by the internal rom. */ | |
223 | if (((cpu->ios[M6811_HPRIO]) & (M6811_SMOD | M6811_MDA)) == M6811_SMOD) | |
224 | { | |
225 | unsigned char val = 0x33; | |
226 | ||
227 | m68hc11sio_io_write_buffer (me, &val, io_map, | |
228 | (unsigned_word) M6811_BAUD, 1); | |
229 | val = 0x12; | |
230 | m68hc11sio_io_write_buffer (me, &val, io_map, | |
231 | (unsigned_word) M6811_SCCR2, 1); | |
232 | } | |
233 | break; | |
234 | } | |
235 | ||
236 | default: | |
237 | hw_abort (me, "Event on unknown port %d", my_port); | |
238 | break; | |
239 | } | |
240 | } | |
241 | ||
242 | ||
243 | void | |
244 | m68hc11sio_rx_poll (struct hw *me, void *data) | |
245 | { | |
246 | SIM_DESC sd; | |
247 | struct m68hc11sio *controller; | |
248 | sim_cpu *cpu; | |
249 | char cc; | |
250 | int cnt; | |
251 | int check_interrupt = 0; | |
252 | ||
253 | controller = hw_data (me); | |
254 | sd = hw_system (me); | |
255 | cpu = STATE_CPU (sd, 0); | |
256 | switch (controller->backend) | |
257 | { | |
258 | case sio_tcp: | |
259 | cnt = dv_sockser_read (sd); | |
260 | if (cnt != -1) | |
261 | { | |
262 | cc = (char) cnt; | |
263 | cnt = 1; | |
264 | } | |
265 | break; | |
266 | ||
267 | case sio_stdio: | |
268 | cnt = sim_io_poll_read (sd, 0 /* stdin */, &cc, 1); | |
269 | break; | |
270 | ||
271 | default: | |
272 | cnt = 0; | |
273 | break; | |
274 | } | |
275 | ||
276 | if (cnt == 1) | |
277 | { | |
278 | /* Raise the overrun flag if the previous character was not read. */ | |
279 | if (cpu->ios[M6811_SCSR] & M6811_RDRF) | |
280 | cpu->ios[M6811_SCSR] |= M6811_OR; | |
281 | ||
282 | cpu->ios[M6811_SCSR] |= M6811_RDRF; | |
283 | controller->rx_char = cc; | |
284 | controller->rx_clear_scsr = 0; | |
285 | check_interrupt = 1; | |
286 | } | |
287 | else | |
288 | { | |
289 | /* handle idle line detect here. */ | |
290 | ; | |
291 | } | |
292 | ||
293 | if (controller->rx_poll_event) | |
294 | { | |
295 | hw_event_queue_deschedule (me, controller->rx_poll_event); | |
296 | controller->rx_poll_event = 0; | |
297 | } | |
298 | ||
299 | if (cpu->ios[M6811_SCCR2] & M6811_RE) | |
300 | { | |
301 | unsigned long clock_cycle; | |
302 | ||
303 | /* Compute CPU clock cycles to wait for the next character. */ | |
304 | clock_cycle = controller->data_length * controller->baud_cycle; | |
305 | ||
306 | controller->rx_poll_event = hw_event_queue_schedule (me, clock_cycle, | |
307 | m68hc11sio_rx_poll, | |
308 | NULL); | |
309 | } | |
310 | ||
311 | if (check_interrupt) | |
312 | interrupts_update_pending (&cpu->cpu_interrupts); | |
313 | } | |
314 | ||
315 | ||
316 | void | |
317 | m68hc11sio_tx_poll (struct hw *me, void *data) | |
318 | { | |
319 | SIM_DESC sd; | |
320 | struct m68hc11sio *controller; | |
321 | sim_cpu *cpu; | |
e0709f50 AC |
322 | |
323 | controller = hw_data (me); | |
324 | sd = hw_system (me); | |
325 | cpu = STATE_CPU (sd, 0); | |
326 | ||
327 | cpu->ios[M6811_SCSR] |= M6811_TDRE; | |
328 | cpu->ios[M6811_SCSR] |= M6811_TC; | |
329 | ||
11115521 | 330 | /* Transmitter is enabled and we have something to send. */ |
e0709f50 AC |
331 | if ((cpu->ios[M6811_SCCR2] & M6811_TE) && controller->tx_has_char) |
332 | { | |
333 | cpu->ios[M6811_SCSR] &= ~M6811_TDRE; | |
334 | cpu->ios[M6811_SCSR] &= ~M6811_TC; | |
335 | controller->tx_has_char = 0; | |
e0709f50 AC |
336 | switch (controller->backend) |
337 | { | |
338 | case sio_tcp: | |
339 | dv_sockser_write (sd, controller->tx_char); | |
340 | break; | |
341 | ||
342 | case sio_stdio: | |
343 | sim_io_write_stdout (sd, &controller->tx_char, 1); | |
344 | sim_io_flush_stdout (sd); | |
345 | break; | |
346 | ||
347 | default: | |
348 | break; | |
349 | } | |
350 | } | |
351 | ||
352 | if (controller->tx_poll_event) | |
353 | { | |
354 | hw_event_queue_deschedule (me, controller->tx_poll_event); | |
355 | controller->tx_poll_event = 0; | |
356 | } | |
357 | ||
358 | if ((cpu->ios[M6811_SCCR2] & M6811_TE) | |
359 | && ((cpu->ios[M6811_SCSR] & M6811_TC) == 0)) | |
360 | { | |
361 | unsigned long clock_cycle; | |
362 | ||
363 | /* Compute CPU clock cycles to wait for the next character. */ | |
364 | clock_cycle = controller->data_length * controller->baud_cycle; | |
365 | ||
366 | controller->tx_poll_event = hw_event_queue_schedule (me, clock_cycle, | |
367 | m68hc11sio_tx_poll, | |
368 | NULL); | |
369 | } | |
370 | ||
11115521 | 371 | interrupts_update_pending (&cpu->cpu_interrupts); |
e0709f50 AC |
372 | } |
373 | ||
374 | /* Descriptions of the SIO I/O ports. These descriptions are only used to | |
375 | give information of the SIO device under GDB. */ | |
376 | io_reg_desc sccr2_desc[] = { | |
377 | { M6811_TIE, "TIE ", "Transmit Interrupt Enable" }, | |
378 | { M6811_TCIE, "TCIE ", "Transmit Complete Interrupt Enable" }, | |
379 | { M6811_RIE, "RIE ", "Receive Interrupt Enable" }, | |
380 | { M6811_ILIE, "ILIE ", "Idle Line Interrupt Enable" }, | |
381 | { M6811_TE, "TE ", "Transmit Enable" }, | |
382 | { M6811_RE, "RE ", "Receive Enable" }, | |
383 | { M6811_RWU, "RWU ", "Receiver Wake Up" }, | |
384 | { M6811_SBK, "SBRK ", "Send Break" }, | |
385 | { 0, 0, 0 } | |
386 | }; | |
387 | ||
388 | io_reg_desc sccr1_desc[] = { | |
389 | { M6811_R8, "R8 ", "Receive Data bit 8" }, | |
390 | { M6811_T8, "T8 ", "Transmit Data bit 8" }, | |
391 | { M6811_M, "M ", "SCI Character length (0=8-bits, 1=9-bits)" }, | |
392 | { M6811_WAKE, "WAKE ", "Wake up method select (0=idle, 1=addr mark" }, | |
393 | { 0, 0, 0 } | |
394 | }; | |
395 | ||
396 | io_reg_desc scsr_desc[] = { | |
397 | { M6811_TDRE, "TDRE ", "Transmit Data Register Empty" }, | |
398 | { M6811_TC, "TC ", "Transmit Complete" }, | |
399 | { M6811_RDRF, "RDRF ", "Receive Data Register Full" }, | |
400 | { M6811_IDLE, "IDLE ", "Idle Line Detect" }, | |
401 | { M6811_OR, "OR ", "Overrun Error" }, | |
402 | { M6811_NF, "NF ", "Noise Flag" }, | |
403 | { M6811_FE, "FE ", "Framing Error" }, | |
404 | { 0, 0, 0 } | |
405 | }; | |
406 | ||
407 | io_reg_desc baud_desc[] = { | |
408 | { M6811_TCLR, "TCLR ", "Clear baud rate (test mode)" }, | |
409 | { M6811_SCP1, "SCP1 ", "SCI baud rate prescaler select (SCP1)" }, | |
410 | { M6811_SCP0, "SCP0 ", "SCI baud rate prescaler select (SCP0)" }, | |
411 | { M6811_RCKB, "RCKB ", "Baur Rate Clock Check (test mode)" }, | |
412 | { M6811_SCR2, "SCR2 ", "SCI Baud rate select (SCR2)" }, | |
413 | { M6811_SCR1, "SCR1 ", "SCI Baud rate select (SCR1)" }, | |
414 | { M6811_SCR0, "SCR0 ", "SCI Baud rate select (SCR0)" }, | |
415 | { 0, 0, 0 } | |
416 | }; | |
417 | ||
418 | static void | |
419 | m68hc11sio_info (struct hw *me) | |
420 | { | |
421 | SIM_DESC sd; | |
422 | uint16 base = 0; | |
423 | sim_cpu *cpu; | |
424 | struct m68hc11sio *controller; | |
425 | uint8 val; | |
426 | long clock_cycle; | |
427 | ||
428 | sd = hw_system (me); | |
429 | cpu = STATE_CPU (sd, 0); | |
430 | controller = hw_data (me); | |
431 | ||
432 | sim_io_printf (sd, "M68HC11 SIO:\n"); | |
433 | ||
434 | base = cpu_get_io_base (cpu); | |
435 | ||
436 | val = cpu->ios[M6811_BAUD]; | |
437 | print_io_byte (sd, "BAUD ", baud_desc, val, base + M6811_BAUD); | |
438 | sim_io_printf (sd, " (%ld baud)\n", | |
439 | (cpu->cpu_frequency / 4) / controller->baud_cycle); | |
440 | ||
441 | val = cpu->ios[M6811_SCCR1]; | |
442 | print_io_byte (sd, "SCCR1", sccr1_desc, val, base + M6811_SCCR1); | |
443 | sim_io_printf (sd, " (%d bits) (%dN1)\n", | |
444 | controller->data_length, controller->data_length - 2); | |
445 | ||
446 | val = cpu->ios[M6811_SCCR2]; | |
447 | print_io_byte (sd, "SCCR2", sccr2_desc, val, base + M6811_SCCR2); | |
448 | sim_io_printf (sd, "\n"); | |
449 | ||
450 | val = cpu->ios[M6811_SCSR]; | |
451 | print_io_byte (sd, "SCSR ", scsr_desc, val, base + M6811_SCSR); | |
452 | sim_io_printf (sd, "\n"); | |
453 | ||
454 | clock_cycle = controller->data_length * controller->baud_cycle; | |
455 | ||
456 | if (controller->tx_poll_event) | |
457 | { | |
458 | signed64 t; | |
459 | int n; | |
460 | ||
461 | t = hw_event_remain_time (me, controller->tx_poll_event); | |
462 | n = (clock_cycle - t) / controller->baud_cycle; | |
463 | n = controller->data_length - n; | |
2990a9f4 | 464 | sim_io_printf (sd, " Transmit finished in %s (%d bit%s)\n", |
a685700c SC |
465 | cycle_to_string (cpu, t, PRINT_TIME | PRINT_CYCLE), |
466 | n, (n > 1 ? "s" : "")); | |
e0709f50 AC |
467 | } |
468 | if (controller->rx_poll_event) | |
469 | { | |
470 | signed64 t; | |
471 | ||
472 | t = hw_event_remain_time (me, controller->rx_poll_event); | |
2990a9f4 | 473 | sim_io_printf (sd, " Receive finished in %s\n", |
a685700c | 474 | cycle_to_string (cpu, t, PRINT_TIME | PRINT_CYCLE)); |
e0709f50 AC |
475 | } |
476 | ||
477 | } | |
478 | ||
479 | static int | |
480 | m68hc11sio_ioctl (struct hw *me, | |
481 | hw_ioctl_request request, | |
482 | va_list ap) | |
483 | { | |
484 | m68hc11sio_info (me); | |
485 | return 0; | |
486 | } | |
487 | ||
488 | /* generic read/write */ | |
489 | ||
490 | static unsigned | |
491 | m68hc11sio_io_read_buffer (struct hw *me, | |
492 | void *dest, | |
493 | int space, | |
494 | unsigned_word base, | |
495 | unsigned nr_bytes) | |
496 | { | |
497 | SIM_DESC sd; | |
498 | struct m68hc11sio *controller; | |
499 | sim_cpu *cpu; | |
500 | unsigned8 val; | |
501 | ||
502 | HW_TRACE ((me, "read 0x%08lx %d", (long) base, (int) nr_bytes)); | |
503 | ||
504 | sd = hw_system (me); | |
505 | cpu = STATE_CPU (sd, 0); | |
506 | controller = hw_data (me); | |
507 | ||
508 | switch (base) | |
509 | { | |
510 | case M6811_SCSR: | |
511 | controller->rx_clear_scsr = cpu->ios[M6811_SCSR] | |
512 | & (M6811_RDRF | M6811_IDLE | M6811_OR | M6811_NF | M6811_FE); | |
513 | ||
514 | case M6811_BAUD: | |
515 | case M6811_SCCR1: | |
516 | case M6811_SCCR2: | |
517 | val = cpu->ios[base]; | |
518 | break; | |
519 | ||
520 | case M6811_SCDR: | |
521 | if (controller->rx_clear_scsr) | |
522 | { | |
523 | cpu->ios[M6811_SCSR] &= ~controller->rx_clear_scsr; | |
524 | } | |
525 | val = controller->rx_char; | |
526 | break; | |
527 | ||
528 | default: | |
529 | return 0; | |
530 | } | |
531 | *((unsigned8*) dest) = val; | |
532 | return 1; | |
533 | } | |
534 | ||
535 | static unsigned | |
536 | m68hc11sio_io_write_buffer (struct hw *me, | |
537 | const void *source, | |
538 | int space, | |
539 | unsigned_word base, | |
540 | unsigned nr_bytes) | |
541 | { | |
542 | SIM_DESC sd; | |
543 | struct m68hc11sio *controller; | |
544 | sim_cpu *cpu; | |
545 | unsigned8 val; | |
546 | ||
547 | HW_TRACE ((me, "write 0x%08lx %d", (long) base, (int) nr_bytes)); | |
548 | ||
549 | sd = hw_system (me); | |
550 | cpu = STATE_CPU (sd, 0); | |
551 | controller = hw_data (me); | |
552 | ||
553 | val = *((const unsigned8*) source); | |
554 | switch (base) | |
555 | { | |
556 | case M6811_BAUD: | |
557 | { | |
558 | long divisor; | |
559 | long baud; | |
560 | ||
561 | cpu->ios[M6811_BAUD] = val; | |
562 | switch (val & (M6811_SCP1|M6811_SCP0)) | |
563 | { | |
564 | case M6811_BAUD_DIV_1: | |
565 | divisor = 1 * 16; | |
566 | break; | |
567 | ||
568 | case M6811_BAUD_DIV_3: | |
569 | divisor = 3 * 16; | |
570 | break; | |
571 | ||
572 | case M6811_BAUD_DIV_4: | |
573 | divisor = 4 * 16; | |
574 | break; | |
575 | ||
576 | default: | |
577 | case M6811_BAUD_DIV_13: | |
578 | divisor = 13 * 16; | |
579 | break; | |
580 | } | |
581 | val &= (M6811_SCR2|M6811_SCR1|M6811_SCR0); | |
582 | divisor *= (1 << val); | |
583 | ||
584 | baud = (cpu->cpu_frequency / 4) / divisor; | |
585 | ||
586 | HW_TRACE ((me, "divide rate %ld, baud rate %ld", | |
587 | divisor, baud)); | |
588 | ||
589 | controller->baud_cycle = divisor; | |
590 | } | |
591 | break; | |
592 | ||
593 | case M6811_SCCR1: | |
594 | { | |
595 | if (val & M6811_M) | |
596 | controller->data_length = 11; | |
597 | else | |
598 | controller->data_length = 10; | |
599 | ||
600 | cpu->ios[M6811_SCCR1] = val; | |
601 | } | |
602 | break; | |
603 | ||
604 | case M6811_SCCR2: | |
605 | if ((val & M6811_RE) == 0) | |
606 | { | |
607 | val &= ~(M6811_RDRF|M6811_IDLE|M6811_OR|M6811_NF|M6811_NF); | |
608 | val |= (cpu->ios[M6811_SCCR2] | |
609 | & (M6811_RDRF|M6811_IDLE|M6811_OR|M6811_NF|M6811_NF)); | |
610 | cpu->ios[M6811_SCCR2] = val; | |
611 | break; | |
612 | } | |
613 | ||
614 | /* Activate reception. */ | |
615 | if (controller->rx_poll_event == 0) | |
616 | { | |
617 | long clock_cycle; | |
618 | ||
619 | /* Compute CPU clock cycles to wait for the next character. */ | |
620 | clock_cycle = controller->data_length * controller->baud_cycle; | |
621 | ||
622 | controller->rx_poll_event = hw_event_queue_schedule (me, clock_cycle, | |
623 | m68hc11sio_rx_poll, | |
624 | NULL); | |
625 | } | |
626 | cpu->ios[M6811_SCCR2] = val; | |
627 | interrupts_update_pending (&cpu->cpu_interrupts); | |
628 | break; | |
629 | ||
630 | /* No effect. */ | |
631 | case M6811_SCSR: | |
632 | return 1; | |
633 | ||
634 | case M6811_SCDR: | |
635 | if (!(cpu->ios[M6811_SCSR] & M6811_TDRE)) | |
636 | { | |
637 | return 0; | |
638 | } | |
639 | ||
640 | controller->tx_char = val; | |
641 | controller->tx_has_char = 1; | |
642 | if ((cpu->ios[M6811_SCCR2] & M6811_TE) | |
643 | && controller->tx_poll_event == 0) | |
644 | { | |
645 | m68hc11sio_tx_poll (me, NULL); | |
646 | } | |
647 | return 1; | |
648 | ||
649 | default: | |
650 | return 0; | |
651 | } | |
652 | return nr_bytes; | |
653 | } | |
654 | ||
655 | ||
656 | const struct hw_descriptor dv_m68hc11sio_descriptor[] = { | |
b93775f5 SC |
657 | { "m68hc11sio", m68hc11sio_finish }, |
658 | { "m68hc12sio", m68hc11sio_finish }, | |
e0709f50 AC |
659 | { NULL }, |
660 | }; | |
661 |