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Commit | Line | Data |
---|---|---|
0c5890bb L |
1 | /** |
2 | * | |
3 | * Pin assignments | |
4 | * | |
72f58822 | 5 | * | Z180-Sig | AVR-Port | Dir | Special Function | |
0c5890bb L |
6 | * +------------+---------------+-------+-----------------------+ |
7 | * | A0 | PA 0 | O | | | |
8 | * | A1 | PA 1 | O | | | |
9 | * | A2 | PA 2 | O | | | |
10 | * | A3 | PA 3 | O | | | |
11 | * | A4 | PA 4 | O | | | |
12 | * | A5 | PA 5 | O | | | |
13 | * | A6 | PA 6 | O | | | |
14 | * | A7 | PA 7 | O | | | |
15 | * | A8 | PC 0 | O | | | |
16 | * | A9 | PC 1 | O | | | |
17 | * | A10 | PC 2 | O | | | |
18 | * | A11 | PC 3 | O | | | |
19 | * | A12 | PC 4 | O | | | |
20 | * | A13 | PC 5 | O | | | |
21 | * | A14 | PC 6 | O | | | |
22 | * | A15 | PC 7 | O | | | |
23 | * | A16 | PE 2 | O | | | |
24 | * | A17 | PE 3 | O | | | |
25 | * | A18 | PE 4 | O | | | |
26 | * | D0 | PF 0 | I/O | | | |
27 | * | D1 | PF 1 | I/O | | | |
28 | * | D2 | PF 2 | I/O | | | |
29 | * | D3 | PF 3 | I/O | | | |
30 | * | D4 | PF 4 | I/O | | | |
31 | * | D5 | PF 5 | I/O | | | |
32 | * | D6 | PF 6 | I/O | | | |
33 | * | D7 | PF 7 | I/O | | | |
34 | * | RD | PD 3 | O | | | |
35 | * | WR | PD 2 | O | | | |
36 | * | MREQ | PD 4 | O | | | |
37 | * | RST | PD 5 | O | | | |
38 | * | BUSREQ | PD 7 | O | | | |
39 | * | BUSACK | PD 6 | I | | | |
40 | * | IOCS1 | PE 5 | I | | | |
41 | * |* HALT | P | | | | |
42 | * |* NMI | P | | | | |
43 | * | | P | | | | |
44 | * | | P | | af1 USART1_TX | | |
45 | * | | P | | af1 USART1_RX | | |
46 | * | | P |JTDI | remap SPI1_NSS' | | |
47 | * | | P |JTDO | remap SPI1_SCK' | | |
48 | * | | P |JTRST | remap SPI1_MISO' | | |
49 | * | | P | | remap SPI1_MOSI' | | |
50 | * | | P | | af1 OSC32 | | |
51 | * | | P | | af1 OSC32 | | |
52 | ||
53 | ||
54 | */ | |
55 | ||
56 | #include <avr/io.h> | |
57 | #include <util/delay.h> | |
58 | #include <stdio.h> | |
59 | #include "debug.h" | |
60 | #include "z80-if.h" | |
61 | ||
62 | ||
63 | /* Number of array elements */ | |
64 | #define NELEMS(x) (sizeof x/sizeof *x) | |
65 | ||
66 | ||
67 | #define CONCAT(x,y) x ## y | |
68 | #define EVALUATOR(x,y) CONCAT(x,y) | |
69 | ||
70 | #define GPIO_(X) CONCAT(GPIO, X) | |
71 | ||
72 | struct bits { | |
73 | uint8_t b0:1; | |
74 | uint8_t b1:1; | |
75 | uint8_t b2:1; | |
76 | uint8_t b3:1; | |
77 | uint8_t b4:1; | |
78 | uint8_t b5:1; | |
79 | uint8_t b6:1; | |
80 | uint8_t b7:1; | |
81 | } __attribute__((__packed__)); | |
82 | ||
83 | #define SBIT(port,pin) ((*(volatile struct bits*)&port).b##pin) | |
84 | ||
85 | ||
86 | ||
87 | #define P_MREQ PORTD | |
88 | #define MREQ 4 | |
89 | #define DDR_MREQ DDRD | |
90 | #define P_RD PORTD | |
91 | #define RD 3 | |
92 | #define P_WR PORTD | |
93 | #define WR 2 | |
94 | #define P_BUSREQ PORTD | |
95 | #define BUSREQ 7 | |
96 | #define DDR_BUSREQ DDRD | |
97 | #define P_BUSACK PORTD | |
9b6b4b31 | 98 | #define PIN_BUSACK PIND |
0c5890bb L |
99 | #define BUSACK 6 |
100 | #define DDR_BUSACK DDRD | |
101 | //#define P_HALT PORTA | |
102 | //#define HALT 12 | |
103 | #define P_IOCS1 PORTE | |
104 | #define IOCS1 5 | |
105 | #define DDR_IOCS1 DDRE | |
106 | //#define P_NMI PORTB | |
107 | //#define NMI 7 | |
108 | #define P_RST PORTD | |
109 | #define DDR_RST DDRD | |
110 | #define RST 5 | |
111 | ||
112 | ||
113 | #define P_DB PORTF | |
114 | #define PIN_DB PINF | |
115 | #define DDR_DB DDRF | |
116 | ||
117 | #define P_ADL PORTA | |
118 | #define P_ADH PORTC | |
119 | #define P_ADB PORTE | |
120 | #define PIN_ADB PINE | |
9b6b4b31 L |
121 | #define DDR_ADL DDRA |
122 | #define DDR_ADH DDRC | |
0c5890bb L |
123 | #define DDR_ADB DDRE |
124 | ||
125 | #define ADB_WIDTH 3 | |
126 | #define ADB_SHIFT 2 | |
127 | //#define ADB_PORT PORTE | |
128 | ||
129 | ||
0c5890bb L |
130 | #define Z80_O_MREQ SBIT(P_MREQ, 4) |
131 | #define Z80_O_RD SBIT(P_RD, 3) | |
132 | #define Z80_O_WR SBIT(P_WR, 2) | |
133 | #define Z80_O_BUSREQ SBIT(P_BUSREQ, 7) | |
134 | //#define Z80_O_NMI SBIT(P_NMI, ) | |
135 | #define Z80_O_RST SBIT(P_RST, 5) | |
9b6b4b31 | 136 | #define Z80_I_BUSACK SBIT(PIN_BUSACK, 6) |
0c5890bb L |
137 | //#define Z80_I_HALT SBIT(P_HALT, ) |
138 | ||
9b6b4b31 | 139 | |
72f58822 | 140 | #if 0 |
0c5890bb L |
141 | void z80_busreq(level_t level) |
142 | { | |
143 | Z80_O_BUSREQ = level; | |
144 | } | |
72f58822 | 145 | #endif |
0c5890bb L |
146 | |
147 | void z80_reset(level_t level) | |
148 | { | |
149 | Z80_O_RST = level; | |
72f58822 L |
150 | if (level) |
151 | Stat |= S_Z180_RUNNING; | |
152 | else | |
153 | Stat &= ~S_Z180_RUNNING; | |
0c5890bb L |
154 | } |
155 | ||
534e1dfc L |
156 | int z80_stat_reset(void) |
157 | { | |
158 | return Z80_O_RST; | |
159 | } | |
0c5890bb L |
160 | |
161 | void z80_reset_pulse(void) | |
162 | { | |
163 | Z80_O_RST = 0; | |
164 | _delay_us(10); | |
165 | Z80_O_RST = 1; | |
72f58822 | 166 | Stat |= S_Z180_RUNNING; |
0c5890bb L |
167 | } |
168 | ||
534e1dfc L |
169 | int z80_runstate(void) |
170 | { | |
171 | return (Stat & S_Z180_RUNNING) != 0; | |
172 | } | |
173 | ||
0c5890bb L |
174 | #if 0 |
175 | int z80_stat_halt(void) | |
176 | { | |
177 | return Z80_I_HALT; | |
178 | } | |
179 | #endif | |
180 | ||
181 | ||
182 | #define MASK(n) ((1<<(n))-1) | |
183 | #define SMASK(w,s) (MASK(w) << (s)) | |
184 | ||
185 | ||
186 | ||
eded7ec4 L |
187 | typedef union { |
188 | uint32_t l; | |
189 | uint16_t w[2]; | |
190 | uint8_t b[4]; | |
191 | } addr_t; | |
192 | ||
193 | ||
0c5890bb L |
194 | /*--------------------------------------------------------------------------*/ |
195 | ||
196 | ||
9b6b4b31 | 197 | static void z80_setup_addrbus_tristate(void) |
0c5890bb | 198 | { |
9b6b4b31 L |
199 | /* /MREQ, /RD, /WR: Input, no pullup */ |
200 | DDR_MREQ &= ~(_BV(MREQ) | _BV(RD) | _BV(WR)); | |
201 | Z80_O_MREQ = 0; | |
202 | Z80_O_RD = 0; | |
203 | Z80_O_WR = 0; | |
204 | ||
0c5890bb L |
205 | P_ADL = 0; |
206 | DDR_ADL = 0; | |
207 | P_ADH = 0; | |
208 | DDR_ADH = 0; | |
9b6b4b31 | 209 | PIN_ADB = P_ADB & ~(MASK(ADB_WIDTH) << ADB_SHIFT); |
0c5890bb L |
210 | DDR_ADB = DDR_ADB & ~(MASK(ADB_WIDTH) << ADB_SHIFT); |
211 | } | |
212 | ||
213 | ||
9b6b4b31 | 214 | static void z80_setup_addrbus_active(void) |
0c5890bb | 215 | { |
9b6b4b31 L |
216 | /* /MREQ, /RD, /WR: Output and high */ |
217 | Z80_O_MREQ = 1; | |
218 | Z80_O_RD = 1; | |
219 | Z80_O_WR = 1; | |
220 | DDR_MREQ |= _BV(MREQ) | _BV(RD) | _BV(WR); | |
221 | ||
0c5890bb L |
222 | DDR_ADL = 0xff; |
223 | DDR_ADH = 0xff; | |
224 | DDR_ADB = DDR_ADB | (MASK(ADB_WIDTH) << ADB_SHIFT); | |
225 | } | |
226 | ||
227 | ||
228 | ||
229 | static void z80_setup_dbus_in(void) | |
230 | { | |
231 | DDR_DB = 0; | |
232 | P_DB = 0; | |
233 | } | |
234 | ||
235 | static void z80_setup_dbus_out(void) | |
236 | { | |
237 | DDR_DB = 0xff; | |
238 | } | |
239 | ||
0c5890bb L |
240 | void z80_setup_bus(void) |
241 | { | |
9b6b4b31 | 242 | /* /ZRESET: Output and low */ |
0c5890bb L |
243 | Z80_O_RST = 0; |
244 | DDR_RST |= _BV(RST); | |
245 | ||
9b6b4b31 | 246 | /* /BUSREQ: Output and high */ |
0c5890bb L |
247 | Z80_O_BUSREQ = 1; |
248 | DDR_BUSREQ |= _BV(BUSREQ); | |
249 | ||
9b6b4b31 | 250 | /* /BUSACK: Input, no pullup */ |
0c5890bb L |
251 | DDR_BUSACK &= ~_BV(BUSACK); |
252 | P_BUSACK &= ~_BV(BUSACK); | |
253 | ||
9b6b4b31 | 254 | /* /IOCS1: Input, no pullup */ |
0c5890bb L |
255 | DDR_IOCS1 &= ~_BV(IOCS1); |
256 | P_IOCS1 &= ~_BV(IOCS1); | |
257 | ||
9b6b4b31 | 258 | z80_setup_addrbus_tristate(); |
0c5890bb | 259 | z80_setup_dbus_in(); |
72f58822 L |
260 | |
261 | Stat &= ~S_Z180_RUNNING; | |
0c5890bb L |
262 | } |
263 | ||
9b6b4b31 L |
264 | /*--------------------------------------------------------------------------*/ |
265 | ||
0c5890bb L |
266 | void z80_request_bus(void) |
267 | { | |
268 | Z80_O_BUSREQ = 0; | |
72f58822 L |
269 | |
270 | if (!(Stat & S_Z180_RUNNING)) | |
271 | Z80_O_RST = 1; | |
272 | ||
0c5890bb | 273 | while(Z80_I_BUSACK == 1); |
9b6b4b31 | 274 | z80_setup_addrbus_active(); |
0c5890bb L |
275 | } |
276 | ||
277 | void z80_release_bus(void) | |
278 | { | |
279 | z80_setup_dbus_in(); | |
9b6b4b31 | 280 | z80_setup_addrbus_tristate(); |
72f58822 L |
281 | |
282 | if (!(Stat & S_Z180_RUNNING)) | |
283 | Z80_O_RST = 0; | |
284 | ||
0c5890bb | 285 | Z80_O_BUSREQ = 1; |
9b6b4b31 L |
286 | //while(Z80_I_BUSACK == 0); |
287 | } | |
288 | ||
289 | /*--------------------------------------------------------------------------*/ | |
290 | ||
291 | static | |
292 | //inline __attribute__ ((always_inline)) | |
293 | void z80_setaddress(uint32_t addr) | |
294 | { | |
295 | addr_t x; x.l = addr; | |
296 | ||
297 | P_ADL = x.b[0]; | |
298 | P_ADH = x.b[1]; | |
299 | PIN_ADB = ((x.b[2] << ADB_SHIFT) ^ P_ADB) & MASK(ADB_WIDTH) << ADB_SHIFT ; | |
0c5890bb L |
300 | } |
301 | ||
302 | void z80_write(uint32_t addr, uint8_t data) | |
303 | { | |
304 | z80_setaddress(addr); | |
305 | Z80_O_MREQ = 0; | |
0c5890bb | 306 | z80_setup_dbus_out(); |
9b6b4b31 L |
307 | P_DB = data; |
308 | P_DB = data; | |
309 | Z80_O_WR = 0; | |
0c5890bb L |
310 | Z80_O_WR = 0; |
311 | Z80_O_WR = 1; | |
312 | Z80_O_MREQ = 1; | |
313 | } | |
314 | ||
315 | uint8_t z80_read(uint32_t addr) | |
316 | { | |
317 | uint8_t data; | |
318 | ||
319 | z80_setaddress(addr); | |
320 | Z80_O_MREQ = 0; | |
321 | z80_setup_dbus_in(); | |
322 | Z80_O_RD = 0; | |
323 | Z80_O_RD = 0; | |
9b6b4b31 | 324 | Z80_O_RD = 0; |
0c5890bb L |
325 | data = PIN_DB; |
326 | Z80_O_RD = 1; | |
327 | Z80_O_MREQ = 1; | |
328 | ||
329 | return data; | |
330 | } | |
331 | ||
332 | ||
333 | void z80_memset(uint32_t addr, uint8_t data, uint32_t length) | |
334 | { | |
335 | z80_setup_dbus_out(); | |
336 | Z80_O_MREQ = 0; | |
337 | while(length--) { | |
338 | z80_setaddress(addr++); | |
339 | P_DB = data; | |
9b6b4b31 L |
340 | P_DB = data; |
341 | Z80_O_WR = 0; | |
0c5890bb L |
342 | Z80_O_WR = 0; |
343 | Z80_O_WR = 1; | |
344 | } | |
345 | Z80_O_MREQ = 1; | |
346 | } | |
347 | ||
9b6b4b31 | 348 | void z80_write_block(const __flash uint8_t *src, uint32_t dest, uint32_t length) |
0c5890bb L |
349 | { |
350 | uint8_t data; | |
351 | ||
352 | z80_setup_dbus_out(); | |
353 | Z80_O_MREQ = 0; | |
354 | while(length--) { | |
355 | z80_setaddress(dest++); | |
356 | data = *src++; | |
357 | P_DB = data; | |
9b6b4b31 L |
358 | P_DB = data; |
359 | Z80_O_WR = 0; | |
0c5890bb L |
360 | Z80_O_WR = 0; |
361 | Z80_O_WR = 1; | |
362 | } | |
363 | Z80_O_MREQ = 1; | |
364 | } | |
365 | ||
366 | /* | |
367 | 0179' rx.bs_mask: ds 1 ; (buf_len - 1) | |
368 | 017A' rx.in_idx: ds 1 ; | |
369 | 017B' rx.out_idx: ds 1 ; | |
370 | 017C' rx.buf: ds rx.buf_len ; | |
371 | 018B' rx.buf_end equ $-1 ; last byte (start+len-1) | |
372 | ||
373 | 018C' tx.bs_mask: ds 1 ; (buf_len - 1) | |
374 | 018D' tx.in_idx: ds 1 ; | |
375 | 018E' tx.out_idx: ds 1 ; | |
376 | 018F' tx.buf: ds tx.buf_len ; | |
377 | 019E' tx.buf_end equ $-1 ; last byte | |
378 | */ | |
379 | ||
380 | ||
381 | typedef struct __attribute__((packed)) { | |
382 | uint8_t mask; | |
383 | uint8_t in_idx; | |
384 | uint8_t out_idx; | |
385 | uint8_t buf[]; | |
386 | } zfifo_t; | |
387 | ||
388 | ||
389 | ||
390 | #define FIFO_BUFSIZE_MASK -3 | |
391 | #define FIFO_INDEX_IN -2 | |
392 | #define FIFO_INDEX_OUT -1 | |
393 | ||
394 | ||
395 | static struct { | |
396 | uint32_t base; | |
397 | uint8_t idx_out, | |
398 | idx_in, | |
399 | mask; | |
400 | } fifo_dsc[NUM_FIFOS]; | |
401 | ||
402 | ||
403 | void z80_memfifo_init(const fifo_t f, uint32_t adr) | |
404 | { | |
405 | ||
406 | DBG_P(2, "z80_memfifo_init: %i, %lx\n", f, adr); | |
407 | ||
408 | fifo_dsc[f].base = adr; | |
409 | ||
410 | z80_request_bus(); | |
411 | ||
412 | fifo_dsc[f].mask = z80_read(adr + FIFO_BUFSIZE_MASK); | |
413 | fifo_dsc[f].idx_in = z80_read(adr + FIFO_INDEX_IN); | |
414 | fifo_dsc[f].idx_out = z80_read(adr + FIFO_INDEX_OUT); | |
415 | ||
416 | z80_release_bus(); | |
417 | } | |
418 | ||
419 | ||
420 | int z80_memfifo_is_empty(const fifo_t f) | |
421 | { | |
422 | int rc = 1; | |
423 | ||
424 | if (fifo_dsc[f].base != 0) { | |
425 | ||
426 | uint32_t adr = fifo_dsc[f].base + FIFO_INDEX_IN; | |
427 | uint8_t idx; | |
428 | ||
429 | z80_request_bus(); | |
430 | idx = z80_read(adr); | |
431 | z80_release_bus(); | |
432 | rc = idx == fifo_dsc[f].idx_out; | |
433 | } | |
434 | ||
435 | return rc; | |
436 | } | |
437 | ||
438 | int z80_memfifo_is_full(const fifo_t f) | |
439 | { | |
440 | int rc = 1; | |
441 | ||
442 | if (fifo_dsc[f].base != 0) { | |
443 | z80_request_bus(); | |
444 | rc = ((fifo_dsc[f].idx_in + 1) & fifo_dsc[f].mask) | |
445 | == z80_read(fifo_dsc[f].base+FIFO_INDEX_OUT); | |
446 | z80_release_bus(); | |
447 | } | |
448 | return rc; | |
449 | } | |
450 | ||
451 | uint8_t z80_memfifo_getc(const fifo_t f) | |
452 | { | |
453 | uint8_t rc, idx; | |
454 | ||
455 | while (z80_memfifo_is_empty(f)) | |
456 | ; | |
457 | ||
458 | z80_request_bus(); | |
459 | idx = fifo_dsc[f].idx_out; | |
460 | rc = z80_read(fifo_dsc[f].base+idx); | |
461 | fifo_dsc[f].idx_out = ++idx & fifo_dsc[f].mask; | |
462 | z80_write(fifo_dsc[f].base+FIFO_INDEX_OUT, fifo_dsc[f].idx_out); | |
463 | z80_release_bus(); | |
464 | ||
465 | return rc; | |
466 | } | |
467 | ||
468 | ||
469 | void z80_memfifo_putc(fifo_t f, uint8_t val) | |
470 | { | |
471 | int idx; | |
472 | ||
473 | while (z80_memfifo_is_full(f)) | |
474 | ; | |
475 | ||
476 | z80_request_bus(); | |
477 | idx = fifo_dsc[f].idx_in; | |
478 | z80_write(fifo_dsc[f].base+idx, val); | |
479 | fifo_dsc[f].idx_in = ++idx & fifo_dsc[f].mask; | |
480 | z80_write(fifo_dsc[f].base+FIFO_INDEX_IN, fifo_dsc[f].idx_in); | |
481 | z80_release_bus(); | |
482 | } | |
483 | ||
484 | /*--------------------------------------------------------------------------*/ | |
72f58822 L |
485 | /* |
486 | TODO: Rewrite msg_fifo routines for AVR | |
487 | */ | |
0c5890bb L |
488 | |
489 | static struct { | |
490 | uint32_t base; | |
491 | //uint8_t idx_out, idx_in; | |
492 | uint16_t count; | |
493 | uint8_t buf[256]; | |
494 | } msg_fifo; | |
495 | ||
496 | /*--------------------------------------------------------------------------*/ | |
497 | ||
498 | #if 0 | |
499 | ||
500 | static void tim1_setup(void) | |
501 | { | |
502 | RCC_APB2RSTR |= RCC_APB2RSTR_TIM1RST; | |
503 | RCC_APB2RSTR &= ~RCC_APB2RSTR_TIM1RST; | |
504 | ||
505 | TIM1_CR1 = 0; | |
506 | ||
507 | TIM1_SMCR = 0 | |
508 | /* | TIM_SMCR_ETP */ | |
509 | /* | TIM_SMCR_ETF_CK_INT_N_2 */ | |
510 | | TIM_SMCR_TS_ETRF | |
511 | | TIM_SMCR_SMS_OFF | |
512 | ; | |
513 | ||
514 | TIM1_DIER = TIM_DIER_TDE; | |
515 | ||
516 | ||
517 | TIM1_CCMR1 = 0 | |
518 | | TIM_CCMR1_OC1M_FORCE_LOW | |
519 | | TIM_CCMR1_CC1S_OUT; | |
520 | ||
521 | TIM1_SMCR |= TIM_SMCR_SMS_TM; | |
522 | } | |
523 | ||
524 | #endif | |
525 | ||
526 | /*--------------------------------------------------------------------------*/ | |
527 | ||
528 | void z80_setup_msg_fifo(void) | |
529 | { | |
530 | // gpio_set_mode(P_BUSACK, GPIO_MODE_INPUT, | |
531 | // GPIO_CNF_INPUT_FLOAT, GPIO_BUSACK | GPIO_IOCS1); | |
532 | ||
533 | //... | |
534 | ||
535 | // msg_fifo.count = NELEMS(msg_fifo.buf); | |
536 | msg_fifo.count = 0; | |
537 | msg_fifo.base = 0; | |
538 | ||
539 | } | |
540 | ||
541 | ||
542 | void z80_init_msg_fifo(uint32_t addr) | |
543 | { | |
544 | ||
545 | DBG_P(1, "z80_init_msg_fifo: %lx\n", addr); | |
546 | ||
547 | z80_request_bus(); | |
548 | z80_write(addr+FIFO_INDEX_OUT, z80_read(addr+FIFO_INDEX_IN)); | |
549 | z80_release_bus(); | |
550 | msg_fifo.base = addr; | |
551 | } | |
552 | ||
553 | ||
554 | int z80_msg_fifo_getc(void) | |
555 | { | |
556 | int c = -1; | |
557 | ||
9b6b4b31 | 558 | #if 0 |
0c5890bb L |
559 | if (msg_fifo.count != (NELEMS(msg_fifo.buf) /*- DMA1_CNDTR4 */ )) { |
560 | c = msg_fifo.buf[msg_fifo.count]; | |
561 | if (++msg_fifo.count == NELEMS(msg_fifo.buf)) | |
562 | msg_fifo.count = 0; | |
563 | ||
564 | if (msg_fifo.base != 0) { | |
565 | z80_request_bus(); | |
566 | z80_write(msg_fifo.base+FIFO_INDEX_OUT, msg_fifo.count); | |
567 | z80_release_bus(); | |
568 | } | |
569 | } | |
9b6b4b31 | 570 | #endif |
0c5890bb L |
571 | |
572 | return c; | |
573 | } |