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[z180-stamp.git] / avr / z180-serv.c
1 /*
2 * (C) Copyright 2014-2016 Leo C. <erbl259-lmu@yahoo.de>
3 *
4 * SPDX-License-Identifier: GPL-2.0
5 */
6
7 #include "z180-serv.h"
8 #include "common.h"
9 #include <stdlib.h>
10 #include <string.h>
11 #include <stdbool.h>
12 #include <util/atomic.h>
13
14 #include "config.h"
15 #include "background.h"
16 #include "env.h"
17 #include "ff.h"
18 #include "serial.h"
19 #include "z80-if.h"
20 #include "debug.h"
21 #include "print-utils.h"
22 #include "timer.h"
23 #include "time.h"
24 #include "bcd.h"
25 #include "rtc.h"
26
27 #define DEBUG_CPM_SDIO 1 /* set to 1 to debug */
28
29 #define debug_cpmsd(fmt, args...) \
30 debug_cond(DEBUG_CPM_SDIO, fmt, ##args)
31
32
33 /*--------------------------------------------------------------------------*/
34
35 struct msg_item {
36 uint8_t fct;
37 uint8_t sub_min, sub_max;
38 void (*func)(uint8_t, int, uint8_t *);
39 };
40
41 uint32_t msg_to_addr(uint8_t *msg)
42 {
43 union {
44 uint32_t as32;
45 uint8_t as8[4];
46 } addr;
47
48 addr.as8[0] = msg[0];
49 addr.as8[1] = msg[1];
50 addr.as8[2] = msg[2];
51 addr.as8[3] = 0;
52
53 return addr.as32;
54 }
55
56
57 static int msg_xmit_header(uint8_t func, uint8_t subf, int len)
58 {
59 z80_memfifo_putc(fifo_msgout, 0xAE);
60 z80_memfifo_putc(fifo_msgout, len+2);
61 z80_memfifo_putc(fifo_msgout, func);
62 z80_memfifo_putc(fifo_msgout, subf);
63
64 return 0;
65 }
66
67 int msg_xmit(uint8_t func, uint8_t subf, int len, uint8_t *msg)
68 {
69 msg_xmit_header(func, subf, len);
70 while (len--)
71 z80_memfifo_putc(fifo_msgout, *msg++);
72
73 return 0;
74 }
75
76 void do_msg_ini_memfifo(uint8_t subf, int len, uint8_t * msg)
77 {
78 (void)len;
79
80 z80_memfifo_init(subf, msg_to_addr(msg));
81 }
82
83
84 void do_msg_char_out(uint8_t subf, int len, uint8_t * msg)
85 {
86 (void)subf;
87
88 while (len--)
89 putchar(*msg++);
90 }
91
92 /* echo message */
93 void do_msg_echo(uint8_t subf, int len, uint8_t * msg)
94 {
95 (void)subf;
96
97 /* send re-echo */
98 msg_xmit(1, 3, len, msg);
99 }
100
101 /* get timer */
102 void do_msg_get_timer(uint8_t subf, int len, uint8_t * msg)
103 {
104 uint32_t time_ms = (len >= 4) ? *(uint32_t *) msg : 0;
105
106 time_ms = get_timer(time_ms);
107 msg_xmit(3, subf, sizeof(time_ms), (uint8_t *) &time_ms);
108 }
109
110 /* ---------------------------------------------------------------------------*/
111
112 #define CPM_DAY_OFFSET ((1978-1900) * 365 + 19) /* 19 leap years */
113
114 /*
115 * Convert CP/M time stamp to a broken-down time structure
116 *
117 */
118 int mk_date_time (int len, uint8_t *msg, struct tm *tmp)
119 {
120 time_t stamp;
121
122 if (len != 5)
123 return -1;
124
125 /* days since 2000-01-01 */
126 long days = msg[3] + (msg[4] << 8) - 8036;
127
128 if (days < 0)
129 return -1;
130
131 stamp = days * ONE_DAY;
132 stamp += bcd2bin(msg[0]);
133 stamp += bcd2bin(msg[1]) * 60 ;
134 stamp += bcd2bin(msg[2]) * 3600L;
135 gmtime_r(&stamp, tmp);
136 return 0;
137 }
138
139 void mk_cpm_time(struct tm *tmp, uint8_t cpm_time[5])
140 {
141 uint16_t days = 1;
142 uint_fast8_t leap=2;
143
144 for (int year=78; year < tmp->tm_year; year++) {
145 days = days + 365 + (leap == 0);
146 leap = (leap+1)%4;
147 }
148 days += tmp->tm_yday;
149
150 cpm_time[0] = bin2bcd(tmp->tm_sec);
151 cpm_time[1] = bin2bcd(tmp->tm_min);
152 cpm_time[2] = bin2bcd(tmp->tm_hour);
153 cpm_time[3] = days;
154 cpm_time[4] = days >> 8;
155 }
156
157 /* get/set cp/m time */
158 void do_msg_get_set_time(uint8_t subf, int len, uint8_t * msg)
159 {
160 struct tm t;
161 uint8_t cpm_time[5];
162 int rc;
163
164 memset(cpm_time, 0, ARRAY_SIZE(cpm_time));
165
166 switch (subf) {
167 case 3: /* set date & time */
168 /* initialize t with current time */
169 rc = rtc_get (&t);
170
171 if (rc >= 0) {
172 /* insert new date & time */
173 if (mk_date_time (len, msg, &t) != 0) {
174 my_puts_P(PSTR("## set_time: Bad date format\n"));
175 break;
176 }
177
178 time_t time;
179 time = mk_gmtime(&t);
180 gmtime_r(&time, &t);
181
182 /* and write to RTC */
183 rc = rtc_set (&t);
184 if(rc)
185 my_puts_P(PSTR("## set_time: Set date failed\n"));
186 } else {
187 my_puts_P(PSTR("## set_time: Get date failed\n"));
188 }
189 /* FALL TROUGH */
190 case 2: /* get date & time */
191 rc = rtc_get (&t);
192 if (rc >= 0) {
193 time_t time;
194 time = mk_gmtime(&t);
195 //mktime(&t);
196 gmtime_r(&time, &t);
197
198 mk_cpm_time(&t, cpm_time);
199 } else {
200 my_puts_P(PSTR("## get_time: Get date failed\n"));
201 }
202 break;
203 }
204
205 msg_xmit(3, subf, sizeof(cpm_time), cpm_time);
206 }
207
208 /* ---------------------------------------------------------------------------*/
209
210 static uint8_t disk_buffer[CONFIG_CPM_BLOCK_SIZE];
211 static struct cpm_drive_s drv_table[CONFIG_CPM_MAX_DRIVE];
212 static int handle_cpm_drv_to;
213
214
215 int drv_list(void)
216 {
217 for (uint8_t i = 0; i < CONFIG_CPM_MAX_DRIVE; i++) {
218 struct cpm_drive_s * p = &drv_table[i];
219 if (p->img_name) {
220 printf_P(PSTR(" dsk%d: %2s %3s attached to %s\n"), i,
221 p->opt&DRV_OPT_RO ? "RO":"RW", p->opt&DRV_OPT_DEBUG ? "DBG":"",
222 p->img_name);
223 }
224 }
225 return 0;
226 }
227
228 int drv_detach(uint8_t drv)
229 {
230 if (drv < CONFIG_CPM_MAX_DRIVE) {
231 struct cpm_drive_s *p = &drv_table[drv];
232
233 debug_cpmsd("## detach dsk%d: %s\n", drv,
234 p->img_name ? p->img_name : "-");
235
236 if (p->img_name) {
237 f_close(&p->fd);
238 free(p->img_name);
239 p->opt = 0;
240 p->flags &= ~DRV_FLG_DIRTY;
241 p->img_name = NULL;
242 }
243 }
244 return 0;
245 }
246
247 static int drv_find_file_attached(const char *fn)
248 {
249 for (uint8_t i = 0; i < CONFIG_CPM_MAX_DRIVE; i++) {
250 struct cpm_drive_s *p = &drv_table[i];
251 if (p->img_name && !strcmp(fn, p->img_name)) {
252 return i;
253 }
254 }
255 return -1;
256 }
257
258 int drv_attach(uint8_t drv, const char *filename, drv_opt_t options)
259 {
260 int res;
261
262 if (drv >= CONFIG_CPM_MAX_DRIVE)
263 return AT_RANGE;
264
265 struct cpm_drive_s *p = &drv_table[drv];
266
267 if (options & DRV_OPT_REATTATCH) {
268 if (filename) {
269 return AT_ERROR;
270 }
271
272 if (!p->img_name) {
273 return AT_NOT;
274 }
275
276 p->opt = options & ~DRV_OPT_REATTATCH;
277
278 /* TODO: change options */
279
280 } else {
281
282 if (p->img_name)
283 return AT_ALREADY;
284 if (drv_find_file_attached(filename) >= 0)
285 return AT_OTHER;
286
287 p->opt = options;
288
289 /* new attachment */
290
291 if ((p->img_name = strdup(filename)) == NULL)
292 return AT_NOMEM;
293
294 res = f_open(&p->fd, p->img_name,
295 FA_WRITE | FA_READ);
296
297 if (!res && f_size(&p->fd) < CONFIG_CPM_DISKSIZE) {
298 unsigned int bw;
299
300 debug_cpmsd(" expanding image file from %ld to %ld\n",
301 f_size(&p->fd), CONFIG_CPM_DISKSIZE);
302
303 res = f_lseek(&p->fd, CONFIG_CPM_DISKSIZE-CONFIG_CPM_BLOCK_SIZE);
304 if (!res) {
305 memset(disk_buffer, 0xe5, CONFIG_CPM_BLOCK_SIZE);
306 res = f_write(&p->fd, disk_buffer, CONFIG_CPM_BLOCK_SIZE, &bw);
307 if (res || bw < CONFIG_CPM_BLOCK_SIZE) {
308 debug_cpmsd(" failed! res: %d, bytes written: %u\n", res, bw);
309 }
310 p->flags |= DRV_FLG_DIRTY;
311 bg_setstat(handle_cpm_drv_to, 1);
312 }
313 }
314 if (res) {
315 drv_detach(drv);
316 return AT_OPEN;
317 }
318 }
319
320 return AT_OK;
321 }
322
323
324 int cpm_drv_to(int state)
325 {
326 static uint32_t ts;
327
328 switch(state) {
329 case 0:
330 break;
331
332 case 1:
333 ts = get_timer(0);
334 state = 2;
335 break;
336
337 case 2:
338 if (get_timer(ts) > 1000) {
339 for (uint_fast8_t i=0; i < CONFIG_CPM_MAX_DRIVE; i++) {
340 if (drv_table[i].flags & DRV_FLG_DIRTY) {
341 f_sync(&drv_table[i].fd);
342 drv_table[i].flags &= ~DRV_FLG_DIRTY;
343 debug_cpmsd("## %7lu f_sync: %c:\n", get_timer(0), i + CONFIG_CPM_BASE_DRIVE);
344 }
345 }
346 state = 0;
347 }
348 }
349 return state;
350 }
351
352
353 void msg_cpm_result(uint8_t subf, uint8_t rc, int res)
354 {
355 uint8_t result_msg[3];
356
357 if (res)
358 rc |= 0x80;
359
360 result_msg[0] = rc;
361 result_msg[1] = res;
362 result_msg[2] = res >> 8;
363
364 if (rc) {
365 debug_cpmsd("###%7lu error rc: %.02x, res: %d\n", get_timer(0), rc, res);
366 }
367
368 msg_xmit(2, subf, sizeof(result_msg), result_msg);
369 }
370
371 /*
372 db 2 ; disk command
373 ds 1 ; subcommand (login/read/write)
374 ds 1 ; @adrv (8 bits) +0
375 ds 1 ; @rdrv (8 bits) +1
376 ds 3 ; @xdph (24 bits) +2
377 */
378
379 void do_msg_cpm_login(uint8_t subf, int len, uint8_t * msg)
380 {
381 uint8_t drv;
382 struct cpm_drive_s *p;
383 FRESULT res = 0;
384
385 (void)subf;
386
387 if (len != 5) {
388 return msg_cpm_result(subf, 0x01, res);
389 }
390
391 debug_cpmsd("\n## %7lu login: %c:\n", get_timer(0), msg[1]+CONFIG_CPM_BASE_DRIVE);
392
393 /* Get relative drive number */
394 drv = msg[1];
395 if ( drv >= CONFIG_CPM_MAX_DRIVE) {
396 debug_cpmsd("## failed: invalid relative drive number '%d'\n", drv);
397 return msg_cpm_result(subf, 0x02, res);
398 }
399
400 p = &drv_table[drv];
401 p->flags &= ~DRV_FLG_OPEN;
402 p->dph = ((uint32_t)msg[4] << 16) + ((uint16_t)msg[3] << 8) + msg[2];
403
404
405 if (p->img_name == NULL) {
406 /* no file attached */
407 debug_cpmsd("## failed: no file attached:\n");
408 return msg_cpm_result(subf, 0x03, res);
409 }
410
411 p->flags |= DRV_FLG_OPEN;
412
413 /* send result*/
414 msg_cpm_result(subf, 0x00, res);
415 }
416
417
418 /*
419 db 2 ; disk command
420 ds 1 ; subcommand (login/read/write)
421 ds 1 ; @adrv (8 bits) +0
422 ds 1 ; @rdrv (8 bits) +1
423 ds 2 ; @trk (16 bits) +2
424 ds 2 ; @sect(16 bits) +4
425 ds 1 ; @cnt (8 bits) +6
426 ds 3 ; phys. transfer addr +7
427 */
428
429 #define ADRV 0
430 #define RDRV 1
431 #define TRK 2
432 #define SEC 4
433 #define CNT 6
434 #define ADDR 7
435
436 void do_msg_cpm_rw(uint8_t subf, int len, uint8_t * msg)
437 {
438 uint8_t drv;
439 uint32_t addr;
440 uint32_t pos;
441 uint8_t secs;
442 bool dowrite = (subf == 2);
443 FRESULT res = 0;
444 uint8_t rc = 0;
445 bool buserr = 0;
446
447 if (len != 10) {
448 return msg_cpm_result(subf, 0x01, res);
449 }
450
451 drv = msg[RDRV];
452 if ( drv>= CONFIG_CPM_MAX_DRIVE) {
453 return msg_cpm_result(subf, 0x02, res);
454 }
455
456 secs = msg[CNT];
457 addr = ((uint32_t)msg[ADDR+2] << 16) + ((uint16_t)msg[ADDR+1] << 8) + msg[ADDR];
458
459
460 /* TODO: tracks per sector from dpb */
461 pos = (((uint16_t)(msg[TRK+1] << 8) + msg[TRK]) * 8
462 + ((uint32_t)(msg[SEC+1] << 8) + msg[SEC])) * CONFIG_CPM_BLOCK_SIZE;
463
464 debug_cpmsd("## %7lu cpm_rw: %s %c: trk:%4d, sec: %d, pos: %.8lx, secs: %2d, "
465 "addr: %.5lx\n", get_timer(0), dowrite ? "write" : " read",
466 msg[RDRV]+CONFIG_CPM_BASE_DRIVE,
467 ((uint16_t)(msg[TRK+1] << 8) + msg[TRK]), msg[SEC], pos, msg[CNT], addr);
468
469 if (pos + secs * CONFIG_CPM_BLOCK_SIZE > CONFIG_CPM_DISKSIZE) {
470 debug_cpmsd(" access > DISKSIZE (%.8lx > %.8lx) aborted!\n",
471 pos + secs * CONFIG_CPM_BLOCK_SIZE, CONFIG_CPM_DISKSIZE);
472 return msg_cpm_result(subf, 0x04, res);
473 }
474
475 res = f_lseek(&drv_table[drv].fd, pos);
476
477 while (!res && secs--) {
478 unsigned int brw;
479 if (dowrite) {
480 if (!(z80_bus_cmd(Request) & ZST_ACQUIRED)) {
481 buserr = 1;
482 break;
483 } else {
484 z80_read_block(disk_buffer, addr, CONFIG_CPM_BLOCK_SIZE);
485 z80_bus_cmd(Release);
486 }
487 res = f_write(&drv_table[drv].fd, disk_buffer, CONFIG_CPM_BLOCK_SIZE, &brw);
488 } else {
489 res = f_read(&drv_table[drv].fd, disk_buffer, CONFIG_CPM_BLOCK_SIZE, &brw);
490 if (res == FR_OK) {
491 if (!(z80_bus_cmd(Request) & ZST_ACQUIRED)) {
492 buserr = 1;
493 break;
494 } else {
495 z80_write_block(disk_buffer, addr, CONFIG_CPM_BLOCK_SIZE);
496 z80_bus_cmd(Release);
497 }
498 }
499 }
500 if (brw != CONFIG_CPM_BLOCK_SIZE) {
501 debug_cpmsd(" short read or write: res: %d, bytes rd/wr: %u\n", res, brw);
502 res = 64;
503 }
504 addr += CONFIG_CPM_BLOCK_SIZE;
505 }
506
507 if (dowrite && !res) {
508 drv_table[drv].flags |= DRV_FLG_DIRTY;
509 bg_setstat(handle_cpm_drv_to, 1);
510 }
511
512 if (buserr) {
513 debug_cpmsd("Bus timeout\n");
514 rc = 0x03;
515 }
516
517 /* send result*/
518 msg_cpm_result(subf, rc, res);
519 }
520
521
522 const FLASH struct msg_item z80_messages[] =
523 {
524 { 0, /* fct nr. */
525 1, 3, /* sub fct nr. from, to */
526 do_msg_ini_memfifo},
527 { 1,
528 1, 1,
529 do_msg_char_out},
530 { 1,
531 2, 2,
532 do_msg_echo},
533 { 2,
534 0, 0,
535 do_msg_cpm_login},
536 { 2,
537 1, 2,
538 do_msg_cpm_rw},
539 { 3,
540 1, 1,
541 do_msg_get_timer},
542 { 3,
543 2, 3, /* 2: get, 3: set time and date */
544 do_msg_get_set_time},
545 { 0xff, /* end mark */
546 0, 0,
547 0},
548
549 };
550
551
552
553
554 void do_message(int len, uint8_t *msg)
555 {
556 uint8_t fct, sub_fct;
557 int_fast8_t i = 0;
558
559 if (len >= 2) {
560 fct = *msg++;
561 sub_fct = *msg++;
562 len -= 2;
563
564 while (fct != z80_messages[i].fct) {
565 if (z80_messages[i].fct == 0xff) {
566 DBG_P(1, "do_message: Unknown function: %i, %i\n",
567 fct, sub_fct);
568 return; /* TODO: unknown message # */
569 }
570
571 ++i;
572 }
573
574 while (fct == z80_messages[i].fct) {
575 if (sub_fct >= z80_messages[i].sub_min &&
576 sub_fct <= z80_messages[i].sub_max )
577 break;
578 ++i;
579 }
580
581 if (z80_messages[i].fct != fct) {
582 DBG_P(1, "do_message: Unknown sub function: %i, %i\n",
583 fct, sub_fct);
584 return; /* TODO: unknown message sub# */
585 }
586
587 (z80_messages[i].func)(sub_fct, len, msg);
588
589
590 } else {
591 /* TODO: error */
592 DBG_P(1, "do_message: to few arguments (%i); this shouldn't happen!\n", len);
593 }
594 }
595
596
597
598 #define CTRBUF_LEN 256
599
600 void check_msg_fifo(void)
601 {
602 int ch;
603 static int_fast8_t state;
604 static int msglen,idx;
605 static uint8_t buffer[CTRBUF_LEN];
606
607 while ((ch = z80_memfifo_getc(fifo_msgin)) >= 0) {
608 switch (state) {
609 case 0: /* wait for start of message */
610 if (ch == 0xAE) { /* TODO: magic number */
611 msglen = 0;
612 idx = 0;
613 state = 1;
614 }
615 break;
616 case 1: /* get msg len */
617 if (ch > 0 && ch <= CTRBUF_LEN) {
618 msglen = ch;
619 state = 2;
620 } else
621 state = 0;
622 break;
623 case 2: /* get message */
624 buffer[idx++] = ch;
625 if (idx == msglen) {
626 do_message(msglen, buffer);
627 state = 0;
628 }
629 break;
630 }
631 }
632 }
633
634
635 int msg_handling(int state)
636 {
637 bool pending;
638
639 ATOMIC_BLOCK(ATOMIC_FORCEON) {
640 pending = (Stat & S_MSG_PENDING) != 0;
641 Stat &= ~S_MSG_PENDING;
642 }
643
644 if (pending) {
645 uint8_t init_request;
646 z80_bus_cmd(Request);
647 init_request = z80_read(0x43);
648 z80_bus_cmd(Release);
649 if ( init_request != 0) {
650 /* Get address of fifo 0 */
651 z80_bus_cmd(Request);
652 uint32_t fifo_addr = z80_read(0x40) +
653 ((uint16_t) z80_read(0x40+1) << 8) +
654 ((uint32_t) z80_read(0x40+2) << 16);
655 z80_write(0x43, 0);
656 z80_bus_cmd(Release);
657
658 if (fifo_addr != 0) {
659 z80_memfifo_init(fifo_msgin, fifo_addr);
660 state = 1;
661 } else
662 state = 0;
663
664 } else {
665 check_msg_fifo();
666 }
667 }
668
669 return state;
670 }
671
672
673 static int handle_msg_handling;
674
675 void setup_z180_serv(void)
676 {
677
678 handle_msg_handling = bg_register(msg_handling, 0);
679 handle_cpm_drv_to = bg_register(cpm_drv_to, 0);
680 }
681
682 void restart_z180_serv(void)
683 {
684 z80_bus_cmd(Request);
685 z80_memset(0x40, 0, 4);
686 z80_bus_cmd(Release);
687
688 for (int i = 0; i < NUM_FIFOS; i++)
689 z80_memfifo_init(i, 0);
690 bg_setstat(handle_msg_handling, 0);
691
692 }
693
694 #if 0
695 /*--------------------------------------------------------------------------*/
696
697 const FLASH uint8_t iniprog[] = {
698 0xAF, // xor a
699 0xED, 0x39, 0x36, // out0 (rcr),a ;disable DRAM refresh
700 0x3E, 0x30, // ld a,030h
701 0xED, 0x39, 0x32 //out0 (dcntl),a ;0 mem, max i/0 wait states
702 };
703
704 const FLASH uint8_t sertest[] = {
705 0xAF, // xor a
706 0xED, 0x39, 0x36, // out0 (rcr),a ;disable DRAM refresh
707 0x3E, 0x30, // ld a,030h
708 0xED, 0x39, 0x32, // out0 (dcntl),a ;0 mem, max i/0 wait states
709 0x3E, 0x80, // ld a,M_MPBT ;no MP, PS=10, DR=16, SS=0
710 0xED, 0x39, 0x03, // out0 (cntlb1),a
711 0x3E, 0x64, // ld a,M_RE + M_TE + M_MOD2 ;
712 0xED, 0x39, 0x01, // out0 (cntla1),a
713 0x3E, 0x00, // ld a,0
714 0xED, 0x39, 0x05, // out0 (stat1),a ;Enable rx interrupts
715 0xED, 0x38, 0x05, //l0:in0 a,(stat1)
716 0xE6, 0x80, // and 80h
717 0x28, 0xF9, // jr z,l0
718 0xED, 0x00, 0x09, // in0 b,(rdr1)
719 0xED, 0x38, 0x05, //l1:in0 a,(stat1)
720 0xE6, 0x02, // and 02h
721 0x28, 0xF9, // jr z,l1
722 0xED, 0x01, 0x07, // out0 (tdr1),b
723 0x18, 0xEA, // jr l0
724 };
725
726 const FLASH uint8_t test1[] = {
727 0xAF, // xor a
728 0xED, 0x39, 0x36, // out0 (rcr),a ;disable DRAM refresh
729 0x3E, 0x30, // ld a,030h
730 0xED, 0x39, 0x32, // out0 (dcntl),a ;0 mem, max i/0 wait states
731 0x21, 0x1E, 0x00, // ld hl,dmclrt ;load DMA registers
732 0x06, 0x08, // ld b,dmct_e-dmclrt
733 0x0E, 0x20, // ld c,sar0l
734 0xED, 0x93, // otimr
735 0x3E, 0xC3, // ld a,0c3h ;dst +1, src +1, burst
736 0xED, 0x39, 0x31, // out0 (dmode),a ;
737 0x3E, 0x62, // ld a,062h ;enable dma0,
738 0xED, 0x39, 0x30, //cl_1: out0 (dstat),a ;copy 64k
739 0x18, 0xFB, // jr cl_1 ;
740 0x00, 0x00, //dmclrt: dw 0 ;src (inc)
741 0x00, // db 0 ;src
742 0x00, 0x00, // dw 0 ;dst (inc),
743 0x00, // db 0 ;dst
744 0x00, 0x00, // dw 0 ;count (64k)
745 };
746 #endif
Z180 Stamp Monitor