summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/machine/iopsio2.cpp
blob: d0a15d9744661baaf637404885287b61ae579d6c (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
// license:BSD-3-Clause
// copyright-holders:Ryan Holtz
/******************************************************************************
*
*   Sony PlayStation 2 IOP SIO2 device skeleton
*
*   To Do:
*     Everything
*
*/

#include "emu.h"
#include "iopsio2.h"

DEFINE_DEVICE_TYPE(SONYIOP_SIO2, iop_sio2_device, "iopsio2", "PlayStation 2 IOP SIO2")

/*static*/ const size_t iop_sio2_device::BUFFER_SIZE = 512; // total guess based on memcard block size

iop_sio2_device::iop_sio2_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
	: device_t(mconfig, SONYIOP_SIO2, tag, owner, clock)
	, m_intc(*this, finder_base::DUMMY_TAG)
	, m_pad0(*this, finder_base::DUMMY_TAG)
	, m_pad1(*this, finder_base::DUMMY_TAG)
	, m_mc0(*this, finder_base::DUMMY_TAG)
{
}

iop_sio2_device::~iop_sio2_device()
{
}

void iop_sio2_device::device_start()
{
	if (!m_response_timer)
		m_response_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(iop_sio2_device::response_timer), this));

	save_item(NAME(m_buffer));
	save_item(NAME(m_curr_byte));
	save_item(NAME(m_end_byte));
	save_item(NAME(m_ctrl));

	save_item(NAME(m_unknown_0x6c));
	save_item(NAME(m_unknown_0x70));
	save_item(NAME(m_unknown_0x74));

	save_item(NAME(m_cmdbuf));
	save_item(NAME(m_curr_port));
	save_item(NAME(m_cmd_size));
	save_item(NAME(m_cmd_length));
	save_item(NAME(m_databuf[0]));
	save_item(NAME(m_databuf[1]));

	save_item(NAME(m_target_device));
}

void iop_sio2_device::device_reset()
{
	memset(m_buffer, 0, BUFFER_SIZE);
	m_curr_byte = 0;
	m_end_byte = 0;
	m_ctrl = 0;

	m_unknown_0x6c = 0;
	m_unknown_0x70 = 0xf;
	m_unknown_0x74 = 0;

	memset(m_cmdbuf, 0, sizeof(uint32_t) * 16);
	m_curr_port = 0;
	m_cmd_size = 0;
	m_cmd_length = 0;
	memset(m_databuf, 0, sizeof(uint32_t) * 4 * 2);

	m_target_device = 0;
}

READ32_MEMBER(iop_sio2_device::read)
{
	uint32_t ret = 0;
	switch (offset)
	{
		case 0x64/4:
			ret = receive();
			//logerror("%s: read: FIFO RECV %08x & %08x\n", machine().describe_context(), ret, mem_mask);
			break;
		case 0x68/4: // Control?
			ret = m_ctrl;
			//logerror("%s: read: CTRL %08x & %08x\n", machine().describe_context(), ret, mem_mask);
			break;
		case 0x6c/4:
			ret = m_unknown_0x6c;
			//logerror("%s: read: Unknown 0x6c (%08x & %08x)\n", machine().describe_context(), ret, mem_mask);
			break;
		case 0x70/4:
			ret = m_unknown_0x70;
			//logerror("%s: read: Unknown 0x70 (%08x & %08x)\n", machine().describe_context(), ret, mem_mask);
			break;
		case 0x74/4:
			ret = m_unknown_0x74;
			//logerror("%s: read: Unknown 0x74 (%08x & %08x)\n", machine().describe_context(), ret, mem_mask);
			break;
		case 0x80/4:
			// Unknown. Case is here to prevent log spam.
			break;
		default:
			logerror("%s: read: Unknown offset %08x & %08x\n", machine().describe_context(), 0x1f808200 + (offset << 2), mem_mask);
			break;
	}
	return ret;
}

WRITE32_MEMBER(iop_sio2_device::write)
{
	switch (offset)
	{
		case 0x00/4: case 0x04/4: case 0x08/4: case 0x0c/4: case 0x10/4: case 0x14/4: case 0x18/4: case 0x1c/4:
		case 0x20/4: case 0x24/4: case 0x28/4: case 0x2c/4: case 0x30/4: case 0x34/4: case 0x38/4: case 0x3c/4:
			//logerror("%s: write: CMDBUF[%d] = %08x & %08x\n", machine().describe_context(), offset, data, mem_mask);
			COMBINE_DATA(&m_cmdbuf[offset]);
			break;
		case 0x40/4: case 0x44/4:
			//logerror("%s: write: DATABUF[0][%d] = %08x & %08x\n", machine().describe_context(), offset - 0x40/4, data, mem_mask);
			COMBINE_DATA(&m_databuf[0][offset - 0x40/4]);
			break;
		case 0x48/4: case 0x4c/4:
			//logerror("%s: write: DATABUF[1][%d] = %08x & %08x\n", machine().describe_context(), offset - 0x48/4, data, mem_mask);
			COMBINE_DATA(&m_databuf[1][offset - 0x48/4]);
			break;
		case 0x50/4: case 0x54/4:
			//logerror("%s: write: DATABUF[2][%d] = %08x & %08x\n", machine().describe_context(), offset - 0x50/4, data, mem_mask);
			COMBINE_DATA(&m_databuf[2][offset - 0x50/4]);
			break;
		case 0x58/4: case 0x5c/4:
			//logerror("%s: write: DATABUF[3][%d] = %08x & %08x\n", machine().describe_context(), offset - 0x58/4, data, mem_mask);
			COMBINE_DATA(&m_databuf[3][offset - 0x58/4]);
			break;
		case 0x60/4:
			//logerror("%s: write: XMIT %08x & %08x\n", machine().describe_context(), data, mem_mask);
			transmit_to_device_hack((uint8_t)data);
			break;
		case 0x68/4: // Control?
		{
			//logerror("%s: write: Control? %08x & %08x\n", machine().describe_context(), data, mem_mask);
			//uint32_t old_ctrl = m_ctrl;
			m_ctrl = data & ~CTRL_IRQ;
			if (data & CTRL_IRQ)
			{
				m_intc->raise_interrupt(iop_intc_device::INT_SIO2);
			}
			else
			{
				m_curr_port = 0;
				m_cmd_size = 0;
				m_cmd_length = 0;
				m_end_byte = 0;
				m_curr_byte = 0;
				m_target_device = 0;
			}
			break;
		}
		case 0x80/4:
			// Unknown. Case is here to prevent log spam.
			break;
		default:
			logerror("%s: write: Unknown offset %08x = %08x & %08x\n", machine().describe_context(), 0x1f808200 + (offset << 2), data, mem_mask);
			break;
	}
}

uint8_t iop_sio2_device::receive()
{
	if (m_curr_byte >= m_end_byte)
	{
		//logerror("D:%d == E:%d, returning 0\n", m_curr_byte, m_end_byte);
		return 0;
	}
	const uint8_t ret = m_buffer[m_curr_byte];
	//logerror("buf[%d] = %02x\n", m_curr_byte, ret);
	m_curr_byte++;
	if (m_curr_byte >= m_end_byte)
	{
		//logerror("Reached end of buffer, resetting to 0\n");
		m_curr_byte = 0;
		m_end_byte = 0;
	}
	return ret;
}

void iop_sio2_device::transmit(uint8_t data)
{
	//logerror("%s: Transmitting: %02x\n", machine().describe_context(), data);
	if (!m_cmd_size && m_cmdbuf[m_curr_port])
	{
		m_cmd_size = (m_cmdbuf[m_curr_port++] & 0x0001ff00) >> 8;
		m_cmd_length = m_cmd_size;
	}

	// TODO: Transmit serially to actual slot device at 250kHz-2MHz as needed
	transmit_to_device_hack(data);
}

ps2_pad_device* iop_sio2_device::pad(uint8_t port)
{
	return (port == 0) ? m_pad0.target() : m_pad1.target();
}

TIMER_CALLBACK_MEMBER(iop_sio2_device::response_timer)
{
	if (param < 2)
	{
		pad(param)->process_fifos();
		while (pad(param)->xmit_fifo_depth() && m_end_byte < BUFFER_SIZE)
		{
			receive_from_device_hack(pad(param)->xmit_fifo_pop());
		}
	}
	else
	{
	}
}

void iop_sio2_device::transmit_to_device_hack(uint8_t data)
{
	if (m_target_device == 0)
	{
		select_device_hack(data);
	}

	//bool cmd_complete = false;
	if (m_cmd_size)
	{
		m_cmd_size--;
		if (!m_cmd_size)
		{
			//cmd_complete = true;
		}
	}

	switch (m_target_device)
	{
		case ps2_pad_device::SIO_DEVICE_ID:
			m_unknown_0x6c = 0x0001d100; // TODO: As above
			receive_from_device_hack(0);

			/*m_unknown_0x6c = 0x00001100; // TODO: What do these bits mean and why does the code expect them?
			pad(m_curr_port)->recv_fifo_push(data);

			if (!m_cmd_size)
			{
			    m_response_timer->adjust(attotime::from_ticks(8*pad(m_curr_port)->xmit_fifo_depth(), 250'000), m_curr_port);
			    m_curr_port++;
			}*/
			break;

		case ps2_mc_device::SIO_DEVICE_ID:
			/*if (m_cmd_size || cmd_complete)
			{
			    logerror("Pushing %02x to memory card, m_cmd_size is %d\n", data, m_cmd_size);
			    m_mc0->recv_fifo_push(data);
			}

			if (cmd_complete)
			{
			    logerror("Command is complete, processing fifos\n");
			    m_unknown_0x6c = 0x00001100;
			    m_mc0->process_fifos();
			    while (m_mc0->xmit_fifo_depth() && m_end_byte < BUFFER_SIZE)
			    {
			        logerror("xmit fifo is %d, end byte is %d\n", m_mc0->xmit_fifo_depth(), m_end_byte);
			        receive_from_device_hack(m_mc0->xmit_fifo_pop());
			    }
			    m_unknown_0x74 = m_cmd_length;
			}*/
			m_unknown_0x6c = 0x0001d100; // TODO: As above
			receive_from_device_hack(0);
			break;

		default:
			m_unknown_0x6c = 0x0001d100; // TODO: As above
			receive_from_device_hack(0);
			logerror("%s: Unknown device selected, can't write data %02x\n", machine().describe_context(), data);
			break;
	}
}

void iop_sio2_device::select_device_hack(uint8_t data)
{
	switch (data)
	{
		case ps2_pad_device::SIO_DEVICE_ID:
			m_target_device = data;
			// TODO: Select transmit frequency, etc.
			//logerror("%s: Selecting transmit device: Pad\n", machine().describe_context());
			break;
		case ps2_mc_device::SIO_DEVICE_ID:
			m_target_device = data;
			//logerror("%s: Selecting transmit device: Memcard\n", machine().describe_context());
			break;

		default:
			m_target_device = 0xff;
			//logerror("%s: Selecting transmit device: Unknown\n", machine().describe_context());
			break;
	}
}

void iop_sio2_device::receive_from_device_hack(uint8_t data)
{
	if (m_end_byte == BUFFER_SIZE)
	{
		return;
	}
	m_buffer[m_end_byte++] = data;
	//logerror("%s: Receiving byte from device (new top: %d)\n", machine().describe_context(), m_end_byte);
}