summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/mc68000/sysbus.cpp
blob: f8818ce005d77148de5455c2e740785223431b5e (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
// license: BSD-3-Clause
// copyright-holders: Dirk Best
/***************************************************************************

    mc-68000-Computer System Bus

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

#include "emu.h"
#include "sysbus.h"


//**************************************************************************
//  BUS DEVICE
//**************************************************************************

DEFINE_DEVICE_TYPE(MC68000_SYSBUS, mc68000_sysbus_device, "mc68000_sysbus", "mc-68000 System Bus")

mc68000_sysbus_device::mc68000_sysbus_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	device_t(mconfig, MC68000_SYSBUS, tag, owner, clock),
	m_irq1_cb(*this),
	m_irq2_cb(*this),
	m_irq3_cb(*this),
	m_irq4_cb(*this),
	m_irq5_cb(*this),
	m_irq6_cb(*this),
	m_irq7_cb(*this)
{
}

mc68000_sysbus_device::~mc68000_sysbus_device()
{
}

void mc68000_sysbus_device::add_card(int slot, device_mc68000_sysbus_card_interface *card)
{
	m_device_list[slot] = card;
}

void mc68000_sysbus_device::device_start()
{

	// clear slots
	std::fill(std::begin(m_device_list), std::end(m_device_list), nullptr);
}

// callbacks from slot device to the host
void mc68000_sysbus_device::irq1_w(int state) { m_irq1_cb(state); }
void mc68000_sysbus_device::irq2_w(int state) { m_irq2_cb(state); }
void mc68000_sysbus_device::irq3_w(int state) { m_irq3_cb(state); }
void mc68000_sysbus_device::irq4_w(int state) { m_irq4_cb(state); }
void mc68000_sysbus_device::irq5_w(int state) { m_irq5_cb(state); }
void mc68000_sysbus_device::irq6_w(int state) { m_irq6_cb(state); }
void mc68000_sysbus_device::irq7_w(int state) { m_irq7_cb(state); }

uint16_t mc68000_sysbus_device::slot_r(int slot, offs_t offset, uint16_t mem_mask)
{
	if (m_device_list[slot])
		return m_device_list[slot]->slot_r(offset, mem_mask);
	else
	{
		logerror("Read from unused slot %d: %06x = ffff & %04x\n", slot, offset, mem_mask);
		return 0xffff;
	}
}

void mc68000_sysbus_device::slot_w(int slot, offs_t offset, uint16_t data, uint16_t mem_mask)
{
	if (m_device_list[slot])
		m_device_list[slot]->slot_w(offset, data, mem_mask);
	else
		logerror("Write to unused slot %d: %06x = %04x & %04x\n", slot, offset, data, mem_mask);
}

uint16_t mc68000_sysbus_device::floppy_r(offs_t offset, uint16_t mem_mask)
{
	uint16_t data = 0xffff;

	for (int i = 0; i < 8; i++)
		if (m_device_list[i])
			data &= m_device_list[i]->floppy_r(offset, mem_mask);

	return data;
}

void mc68000_sysbus_device::floppy_w(offs_t offset, uint16_t data, uint16_t mem_mask)
{
	for (int i = 0; i < 8; i++)
		if (m_device_list[i])
			m_device_list[i]->floppy_w(offset, data, mem_mask);
}


//**************************************************************************
//  SLOT DEVICE
//**************************************************************************

DEFINE_DEVICE_TYPE(MC68000_SYSBUS_SLOT, mc68000_sysbus_slot_device, "mc68000_sysbus_slot", "mc-68000 System Bus Slot")

mc68000_sysbus_slot_device::mc68000_sysbus_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	mc68000_sysbus_slot_device(mconfig, MC68000_SYSBUS_SLOT, tag, owner, clock)
{
}

mc68000_sysbus_slot_device::mc68000_sysbus_slot_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
	device_t(mconfig, type, tag, owner, clock),
	device_single_card_slot_interface<device_mc68000_sysbus_card_interface>(mconfig, *this)
{
}

void mc68000_sysbus_slot_device::device_resolve_objects()
{
	device_mc68000_sysbus_card_interface *const card = get_card_device();

	if (card)
	{
		mc68000_sysbus_device *bus = downcast<mc68000_sysbus_device *>(m_owner);
		card->set_bus(bus, tag());
	}
}

void mc68000_sysbus_slot_device::device_start()
{
}


//**************************************************************************
//  CARD INTERFACE
//**************************************************************************

device_mc68000_sysbus_card_interface::device_mc68000_sysbus_card_interface(const machine_config &mconfig, device_t &device) :
	device_interface(device, "mc68000sysbus"),
	m_bus(nullptr),
	m_next(nullptr),
	m_slot_tag(nullptr),
	m_slot(-1)
{
}

device_mc68000_sysbus_card_interface::~device_mc68000_sysbus_card_interface()
{
}

void device_mc68000_sysbus_card_interface::set_bus(mc68000_sysbus_device *bus, const char *slot_tag)
{
	m_slot_tag = slot_tag;
	m_bus = bus;
}

void device_mc68000_sysbus_card_interface::interface_pre_start()
{
	if (!m_bus)
		fatalerror("mc-68000 System Bus device undefined\n");

	if (m_slot < 0)
	{
		if (!m_bus->started())
			throw device_missing_dependencies();

		// extract the slot number from the last digit of the slot tag
		size_t const len = strlen(m_slot_tag);

		m_slot = (m_slot_tag[len - 1] - '0');
		if (m_slot < 0 || m_slot > 7)
			fatalerror("Slot %x out of range for mc-68000 System Bus\n", m_slot);

		m_bus->add_card(m_slot, this);
	}
}