summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/machine/naomig1.cpp
blob: 226b2e45dc40c9966d6b18f0b098ab75f7302430 (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
// license:BSD-3-Clause
// copyright-holders:Olivier Galibert

#include "emu.h"
#include "machine/naomig1.h"

void naomi_g1_device::amap(address_map &map)
{
	map(0x04, 0x07).rw(this, FUNC(naomi_g1_device::sb_gdstar_r), FUNC(naomi_g1_device::sb_gdstar_w));
	map(0x08, 0x0b).rw(this, FUNC(naomi_g1_device::sb_gdlen_r), FUNC(naomi_g1_device::sb_gdlen_w));
	map(0x0c, 0x0f).rw(this, FUNC(naomi_g1_device::sb_gddir_r), FUNC(naomi_g1_device::sb_gddir_w));
	map(0x14, 0x17).rw(this, FUNC(naomi_g1_device::sb_gden_r), FUNC(naomi_g1_device::sb_gden_w));
	map(0x18, 0x1b).rw(this, FUNC(naomi_g1_device::sb_gdst_r), FUNC(naomi_g1_device::sb_gdst_w));
	map(0x80, 0x83).w(this, FUNC(naomi_g1_device::sb_g1rrc_w));
	map(0x84, 0x87).w(this, FUNC(naomi_g1_device::sb_g1rwc_w));
	map(0x88, 0x8b).w(this, FUNC(naomi_g1_device::sb_g1frc_w));
	map(0x8c, 0x8f).w(this, FUNC(naomi_g1_device::sb_g1fwc_w));
	map(0x90, 0x93).w(this, FUNC(naomi_g1_device::sb_g1crc_w));
	map(0x94, 0x97).w(this, FUNC(naomi_g1_device::sb_g1cwc_w));
	map(0xa0, 0xa3).w(this, FUNC(naomi_g1_device::sb_g1gdrc_w));
	map(0xa4, 0xa7).w(this, FUNC(naomi_g1_device::sb_g1gdwc_w));
	map(0xb0, 0xb3).r(this, FUNC(naomi_g1_device::sb_g1sysm_r));
	map(0xb4, 0xb7).w(this, FUNC(naomi_g1_device::sb_g1crdyc_w));
	map(0xb8, 0xbb).w(this, FUNC(naomi_g1_device::sb_gdapro_w));
	map(0xf4, 0xf7).r(this, FUNC(naomi_g1_device::sb_gdstard_r));
	map(0xf8, 0xfb).r(this, FUNC(naomi_g1_device::sb_gdlend_r));
}

naomi_g1_device::naomi_g1_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock)
	: device_t(mconfig, type, tag, owner, clock)
	, irq_cb(*this)
{
}

void naomi_g1_device::device_start()
{
	timer = timer_alloc(G1_TIMER_ID);
	irq_cb.resolve_safe();

	save_item(NAME(gdstar));
	save_item(NAME(gdlen));
	save_item(NAME(gddir));
	save_item(NAME(gden));
	save_item(NAME(gdst));
}

void naomi_g1_device::device_reset()
{
	gdstar = 0;
	gdlen = 0;
	gddir = 0;
	gden = 0;
	gdst = 0;
}

void naomi_g1_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
	timer.adjust(attotime::never);
	if(!gdst)
		return;
	gdst = 0;
	irq_cb(DMA_GDROM_IRQ);
}

READ32_MEMBER(naomi_g1_device::sb_gdstar_r)
{
	return gdstar;
}

WRITE32_MEMBER(naomi_g1_device::sb_gdstar_w)
{
	COMBINE_DATA(&gdstar);
	logerror("G1: gdstar_w %08x @ %08x\n", data, mem_mask);
}

READ32_MEMBER(naomi_g1_device::sb_gdlen_r)
{
	return gdlen;
}

WRITE32_MEMBER(naomi_g1_device::sb_gdlen_w)
{
	COMBINE_DATA(&gdlen);
	logerror("G1: gdlen_w %08x @ %08x\n", data, mem_mask);
}

READ32_MEMBER(naomi_g1_device::sb_gddir_r)
{
	return gddir;
}

WRITE32_MEMBER(naomi_g1_device::sb_gddir_w)
{
	COMBINE_DATA(&gddir);
	gddir &= 1;
	logerror("G1: gddir_w %08x @ %08x\n", data, mem_mask);
}

READ32_MEMBER(naomi_g1_device::sb_gden_r)
{
	return gden;
}

WRITE32_MEMBER(naomi_g1_device::sb_gden_w)
{
	COMBINE_DATA(&gden);
	gden &= 1;
	logerror("G1: gden_w %08x @ %08x\n", data, mem_mask);
}

READ32_MEMBER(naomi_g1_device::sb_gdst_r)
{
	return gdst;
}

WRITE32_MEMBER(naomi_g1_device::sb_gdst_w)
{
	uint32_t old = gdst;
	COMBINE_DATA(&gdst);
	gdst &= 1;
	logerror("G1: gdst_w %08x @ %08x\n", data, mem_mask);
	if(!old && gdst && gden) {
		// DMA starts

		uint32_t adr = gdstar;
		uint32_t len = gdlen;

		// Deunan says round up to 32, doc says complete with zeroes.
		// Virtua Tennis requires one of the two to boot
		// We'll go with DK for now.
		//
		// In any case, low bit is ignored
		len = (len + 30) & ~30;

		bool to_mainram = true;
		while(len) {
			uint8_t *base;
			uint32_t limit = len;
			dma_get_position(base, limit, to_mainram);

			if(!limit)
				break;
			uint32_t tlen = limit > len ? len : limit;
			dma(base, adr, tlen, to_mainram);
			adr += tlen;
			len -= tlen;
			dma_advance(tlen);
		}

		while(len && to_mainram) {
			unsigned char zero[32];
			memset(zero, 0, sizeof(zero));
			uint32_t tlen = len > 32 ? 32 : len;
			dma(zero, adr, tlen, to_mainram);
			adr += tlen;
			len -= tlen;
		}

		/* 12x * 75 Hz = 0,00(1) secs per sector */
		/* TODO: make DMA to be single step */
		timer->adjust(attotime::from_usec(1111*(gdlen/2048)));
	}
}

WRITE32_MEMBER(naomi_g1_device::sb_g1rrc_w)
{
	logerror("G1: g1rrc_w %08x @ %08x\n", data, mem_mask);
}

WRITE32_MEMBER(naomi_g1_device::sb_g1rwc_w)
{
	logerror("G1: g1rwc_w %08x @ %08x\n", data, mem_mask);
}

WRITE32_MEMBER(naomi_g1_device::sb_g1crc_w)
{
	logerror("G1: g1crc_w %08x @ %08x\n", data, mem_mask);
}

WRITE32_MEMBER(naomi_g1_device::sb_g1cwc_w)
{
	logerror("G1: g1cwc_w %08x @ %08x\n", data, mem_mask);
}

WRITE32_MEMBER(naomi_g1_device::sb_g1frc_w)
{
	logerror("G1: g1frc_w %08x @ %08x\n", data, mem_mask);
}

WRITE32_MEMBER(naomi_g1_device::sb_g1fwc_w)
{
	logerror("G1: g1fwc_w %08x @ %08x\n", data, mem_mask);
}

WRITE32_MEMBER(naomi_g1_device::sb_g1gdrc_w)
{
	logerror("G1: g1gdrc_w %08x @ %08x\n", data, mem_mask);
}

WRITE32_MEMBER(naomi_g1_device::sb_g1gdwc_w)
{
	logerror("G1: g1gdwc_w %08x @ %08x\n", data, mem_mask);
}

READ32_MEMBER(naomi_g1_device::sb_g1sysm_r)
{
	logerror("G1: g1sysm_r @ %08x\n", mem_mask);
	return 0;
}

WRITE32_MEMBER(naomi_g1_device::sb_g1crdyc_w)
{
	logerror("G1: g1crdyc_w %08x @ %08x\n", data, mem_mask);
}

WRITE32_MEMBER(naomi_g1_device::sb_gdapro_w)
{
	logerror("G1: gdapro_w %08x @ %08x\n", data, mem_mask);
}

READ32_MEMBER(naomi_g1_device::sb_gdstard_r)
{
	logerror("G1: gdstard_r @ %08x\n", mem_mask);
	return 0;
}

READ32_MEMBER(naomi_g1_device::sb_gdlend_r)
{
	logerror("G1: gdlend_r @ %08x\n", mem_mask);
	return 0;
}

void naomi_g1_device::dma(void *dma_ptr, uint32_t main_adr, uint32_t size, bool to_mainram)
{
	if(!_dma_cb.isnull())
		_dma_cb(main_adr, dma_ptr, size >> 5, 32, to_mainram);
}