summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/machine/gaelco3d.cpp
blob: 315cba86b4cbac193e4ef2440504031f74f0d893 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
// license:BSD-3-Clause
// copyright-holders:Couriersud
/***************************************************************************

    Gaelco 3D serial hardware

    Couriersud, early 2010

    Not all lines are fully understood. There is some handshaking going
    on on send which is not fully understood. Those wishing to have a look
    at this:

    Serial send:          0x1fca (radikalb, 68020) 1866e (surfplnt)
    Serial receive:       0x1908 (radikalb, 68020) 185ae

    The receive is interrupt driven (interrupt 6) and the send is
    initiated out of the normal program loop. There is the chance
    of race conditions in mame.

    To run two instances of radikalb on *nix, use the following

    a) Uncomment SHARED_MEM_DRIVER below
    b) Open two terminals
    c) In terminal 1: mkdir /tmp/x1; cd /tmp/x1; /path/to/mame64 -np 2 -mt -rp /mnt/mame/romlib/r -inipath . radikalb -w -nomaximize -inipath .
    d) In terminal 2: mkdir /tmp/x2; cd /tmp/x2; /path/to/mame64 -np 2 -mt -rp /mnt/mame/romlib/r -inipath . radikalb -w -nomaximize -inipath .
    e) Set one instance to be master and one to be slave in service mode
    f) Have fun

***************************************************************************/

#include "emu.h"
#include "gaelco3d.h"

//#define SHARED_MEM_DRIVER      (1)

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef _MSC_VER
#include <io.h>
#define S_IRWXU (_S_IREAD | _S_IWRITE | _S_IEXEC)
#else
#include <unistd.h>
#endif
#include <errno.h>
#ifdef SHARED_MEM_DRIVER
#include <sys/mman.h>
#endif

#define VERBOSE     (0)
#if VERBOSE
#define LOGMSG(x)   logerror x
#else
#define LOGMSG(x)   do {} while (0);
#endif

/* external status bits */
#define GAELCOSER_STATUS_READY          0x01
#define GAELCOSER_STATUS_RTS            0x02

/* only RTS currently understood ! */
//#define GAELCOSER_STATUS_DTR          0x04

/* internal bits follow ... */
#define GAELCOSER_STATUS_IRQ_ENABLE     0x10
#define GAELCOSER_STATUS_RESET          0x20
#define GAELCOSER_STATUS_SEND           0x40

/*
 * 115200 seems plausible, radikalb won't work below this speed
 * surfplnt will not work below 460800 ....
 * speedup will not work above 115200
 * 10 bits = 8 data + 1 start + 1 stop
 */

#define LINK_BAUD (115200*4)
//Only for speedup
//#define LINK_BAUD (115200)
#define LINK_BITS 10

#define LINK_FREQ (LINK_BAUD / LINK_BITS)

/* Sync up the instances 8 times for each byte transferred */
#define SYNC_MULT (4)

#define SYNC_FREQ (15000000 / 20) //(LINK_FREQ * SYNC_MULT)

/* allow for slight differences in execution speed */

#define LINK_SLACK ((SYNC_MULT / 4) + 1)
#define LINK_SLACK_B ((LINK_SLACK / 3) + 1)



/* code below currently works on unix only */
#ifdef SHARED_MEM_DRIVER
gaelco_serial_device::osd_shared_mem *gaelco_serial_device::osd_sharedmem_alloc(const char *path, int create, size_t size)
{
	int fd;
	osd_shared_mem *os_shmem = (osd_shared_mem *)malloc(sizeof(osd_shared_mem));

	if (create)
	{
		char *buf = (char *) malloc(size);
		memset(buf,0, size);

		fd = open(path, O_RDWR | O_CREAT, S_IRWXU);
		write(fd, buf, size);
		os_shmem->creator = 1;
	}
	else
	{
		fd = open(path, O_RDWR);
		if (fd == -1)
		{
			free(os_shmem);
			return nullptr;
		}
		os_shmem->creator = 0;
	}
	os_shmem->fn = (char *) malloc(strlen(path)+1);
	strcpy(os_shmem->fn, path);

	assert(fd != -1);

	os_shmem->ptr = mmap(nullptr, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
	os_shmem->size = size;
	close(fd);
	return os_shmem;
}

void gaelco_serial_device::osd_sharedmem_free(osd_shared_mem *os_shmem)
{
	munmap(os_shmem->ptr, os_shmem->size);
	if (os_shmem->creator)
		unlink(os_shmem->fn);
	free(os_shmem->fn);
	free(os_shmem);
}

void *gaelco_serial_device::osd_sharedmem_ptr(osd_shared_mem *os_shmem)
{
	return os_shmem->ptr;
}
#else
gaelco_serial_device::osd_shared_mem *gaelco_serial_device::osd_sharedmem_alloc(const char *path, int create, size_t size)
{
	osd_shared_mem *os_shmem = (osd_shared_mem *) malloc(sizeof(osd_shared_mem));

	os_shmem->creator = 0;

	os_shmem->ptr = (void *) malloc(size);
	os_shmem->size = size;
	return os_shmem;
}

void gaelco_serial_device::osd_sharedmem_free(osd_shared_mem *os_shmem)
{
	free(os_shmem->ptr);
	free(os_shmem);
}

void *gaelco_serial_device::osd_sharedmem_ptr(osd_shared_mem *os_shmem)
{
	return os_shmem->ptr;
}
#endif

/***************************************************************************
    DEVICE INTERFACE
***************************************************************************/

#define PATH_NAME "/tmp/gaelco_serial"

void gaelco_serial_device::buf_reset(buf_t *buf)
{
	buf->stat = GAELCOSER_STATUS_RTS | GAELCOSER_STATUS_RESET;
	buf->data = 0;
	buf->data_cnt = -1;
	buf->cnt = 0;
}

DEFINE_DEVICE_TYPE(GAELCO_SERIAL, gaelco_serial_device, "gaelco_serial", "Gaelco 3D Serial Hardware")

gaelco_serial_device::gaelco_serial_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
	: device_t(mconfig, GAELCO_SERIAL, tag, owner, clock),
	m_irq_handler(*this),
	m_status(0),
	m_last_in_msg_cnt(0),
	m_slack_cnt(0),
	m_sync_timer(nullptr),
	m_in_ptr(nullptr),
	m_out_ptr(nullptr),
	m_os_shmem(nullptr),
	m_shmem(nullptr)
{
}

//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void gaelco_serial_device::device_start()
{
	/* validate arguments */
	assert(strlen(tag()) < 20);

	m_irq_handler.resolve_safe();
	m_sync_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(gaelco_serial_device::link_cb), this));

	/* register for save states */
	//save_item(NAME(earom->offset));
	//save_item(NAME(earom->data));

#ifdef SHARED_MEM_DRIVER
	m_sync_timer->adjust(attotime::zero,0,attotime::from_hz(SYNC_FREQ));
#endif

	m_os_shmem = osd_sharedmem_alloc(PATH_NAME, 0, sizeof(shmem_t));
	if (m_os_shmem == nullptr)
	{
		m_os_shmem = osd_sharedmem_alloc(PATH_NAME, 1, sizeof(shmem_t));
		m_shmem = (shmem_t *) osd_sharedmem_ptr(m_os_shmem);

		m_in_ptr = &m_shmem->buf[0];
		m_out_ptr = &m_shmem->buf[1];
	}
	else
	{
		m_shmem = (shmem_t *) osd_sharedmem_ptr(m_os_shmem);
		m_in_ptr = &m_shmem->buf[1];
		m_out_ptr = &m_shmem->buf[0];
	}
}

//-------------------------------------------------
//  device_reset - device-specific reset
//-------------------------------------------------

void gaelco_serial_device::device_reset()
{
	m_status = GAELCOSER_STATUS_READY    |GAELCOSER_STATUS_IRQ_ENABLE ;

	m_last_in_msg_cnt = -1;
	m_slack_cnt = LINK_SLACK_B;

	std::lock_guard<std::mutex> guard(m_mutex);
	buf_reset(m_out_ptr);
	buf_reset(m_in_ptr);
}

//-------------------------------------------------
//  device_stop - device-specific stop
//-------------------------------------------------

void gaelco_serial_device::device_stop()
{
	{
		std::lock_guard<std::mutex> guard(m_mutex);
		buf_reset(m_out_ptr);
		buf_reset(m_in_ptr);
	}
	osd_sharedmem_free(m_os_shmem);
}

TIMER_CALLBACK_MEMBER( gaelco_serial_device::set_status_cb )
{
	uint8_t mask = param >> 8;
	uint8_t set = param & 0xff;

	m_status &= mask;
	m_status |= set;
}

void gaelco_serial_device::set_status(uint8_t mask, uint8_t set, int wait)
{
	machine().scheduler().timer_set(attotime::from_hz(wait), timer_expired_delegate(FUNC(gaelco_serial_device::set_status_cb), this), (mask << 8)|set);
}

void gaelco_serial_device::process_in()
{
	int t;

	if ((m_in_ptr->stat & GAELCOSER_STATUS_RESET) != 0)
		m_out_ptr->cnt = 0;

	/* new data available ? */
	t = m_in_ptr->data_cnt;
	if (t != m_last_in_msg_cnt)
	{
		m_last_in_msg_cnt = t;
		if (m_in_ptr->cnt > 10)
		{
			m_status &= ~GAELCOSER_STATUS_READY;
			LOGMSG(("command receive %02x at %d (%d)\n", m_in_ptr->data, m_out_ptr->cnt, m_in_ptr->cnt));
			if ((m_status & GAELCOSER_STATUS_IRQ_ENABLE) != 0)
			{
				m_irq_handler(1);
				LOGMSG(("irq!\n"));
			}
		}
	}
}

void gaelco_serial_device::sync_link()
{
	volatile buf_t *buf = m_in_ptr;
	int breakme = 1;
	do
	{
		std::lock_guard<std::mutex> guard(m_mutex);

		process_in();
		/* HACK: put some timing noise on the line */
		if (buf->cnt + m_slack_cnt > m_out_ptr->cnt)
			breakme = 0;
		/* stop if not connected .. */
		if ((m_out_ptr->stat & GAELCOSER_STATUS_RESET) != 0)
			breakme = 0;

	} while (breakme);

	m_slack_cnt++;
	m_slack_cnt = (m_slack_cnt % LINK_SLACK) + LINK_SLACK_B;

	{
		std::lock_guard<std::mutex> guard(m_mutex);
		m_out_ptr->stat &= ~GAELCOSER_STATUS_RESET;
	}
}

TIMER_CALLBACK_MEMBER( gaelco_serial_device::link_cb )
{
	std::lock_guard<std::mutex> guard(m_mutex);
	m_out_ptr->cnt++;
	sync_link();
}


/***************************************************************************
    INTERFACE FUNCTIONS
***************************************************************************/



WRITE_LINE_MEMBER(gaelco_serial_device::irq_enable)
{
	LOGMSG(("???? irq enable %d\n", state));
}

READ8_MEMBER(gaelco_serial_device::status_r)
{
	uint8_t ret = 0;

	std::lock_guard<std::mutex> guard(m_mutex);

	process_in();
	if ((m_status & GAELCOSER_STATUS_READY) != 0)
		ret |= 0x01;
	if ((m_in_ptr->stat & GAELCOSER_STATUS_RTS) != 0)
		ret |= 0x02;

	return ret;
}

WRITE8_MEMBER(gaelco_serial_device::data_w)
{
	std::lock_guard<std::mutex> guard(m_mutex);

	m_out_ptr->data = data;
	m_status &= ~GAELCOSER_STATUS_READY;
	m_out_ptr->data_cnt++;

	set_status( ~GAELCOSER_STATUS_READY, GAELCOSER_STATUS_READY, LINK_FREQ );

	LOGMSG(("command send %02x at %d\n", data, m_out_ptr->cnt));
}

READ8_MEMBER( gaelco_serial_device::data_r)
{
	uint8_t ret;

	std::lock_guard<std::mutex> guard(m_mutex);
	process_in();
	ret = (m_in_ptr->data & 0xff);

	m_irq_handler(0);
	LOGMSG(("read %02x at %d (%d)\n", ret, m_out_ptr->cnt, m_in_ptr->cnt));

	/* if we are not sending, mark as as ready */
	if ((m_status & GAELCOSER_STATUS_SEND) == 0)
		m_status |= GAELCOSER_STATUS_READY;

	return ret;
}

WRITE_LINE_MEMBER(gaelco_serial_device::unknown_w)
{
	std::lock_guard<std::mutex> guard(m_mutex);
	LOGMSG(("???? unknown serial access %d\n", state));

}

WRITE_LINE_MEMBER(gaelco_serial_device::rts_w)
{
	std::lock_guard<std::mutex> guard(m_mutex);

	if (state == 0)
		m_out_ptr->stat |= GAELCOSER_STATUS_RTS;
	else
	{
		//Commented out for now
		//m_status |= GAELCOSER_STATUS_READY;
		m_out_ptr->stat &= ~GAELCOSER_STATUS_RTS;
	}
}

WRITE_LINE_MEMBER(gaelco_serial_device::tr_w)
{
	LOGMSG(("set transmit %d\n", data));
	std::lock_guard<std::mutex> guard(m_mutex);
	if (state != 0)
		m_status |= GAELCOSER_STATUS_SEND;
	else
		m_status &= ~GAELCOSER_STATUS_SEND;
}