summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/machine/68153bim.h
blob: 124870b819422a0071930f43b679d50b4b055e18 (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
// license:BSD-3-Clause
// copyright-holders:Joakim Larsson Edstrom
/**********************************************************************
*
*   Motorola MC68153 BIM - Bus Interrupter Module
*
*                           _____   _____
*                  Vcc   1 |*    \_/     | 40  A3
*                  RW*   2 |             | 39  A2
*                  CS*   3 |             | 38  A1
*                 DTACK* 4 |             | 37  D7
*                 IACK*  5 |             | 36  D6
*                IACKIN* 6 |             | 35  D5
*               IACKOUT* 7 |             | 34  D4
*                 IRQ1*  8 |             | 33  D3
*                  GND   9 |             | 32  D2
*                  GND  10 |             | 31  GND
*                  Vcc  11 |             | 30  VCC
*                 IRQ2* 12 |   MC68153   | 29  D1
*                 IRQ3* 13 |  EI68C153   | 28  D0
*                 IRQ4* 14 |             | 27  INTAE*
*                 IRQ5* 15 |             | 26  INTAL1
*                 IRQ6* 16 |             | 25  INTAL0
*                 IRQ7* 17 |             | 24  INT3*
*                  CLK* 18 |             | 23  INT2*
*                 INT0* 19 |             | 22  INT1*
*                  GND  20 |_____________| 21  Vcc
*
**********************************************************************/

#ifndef MAME_MACHINE_68153BIM_H
#define MAME_MACHINE_68153BIM_H

#pragma once


//**************************************************************************
//  TYPE DEFINITIONS
//**************************************************************************

class bim68153_device;

class bim68153_channel : public device_t
{
	friend class bim68153_device;

public:
	bim68153_channel(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);

	// device-level overrides
	virtual void device_start() override;
	virtual void device_reset() override;

	// read register handlers
	uint8_t do_bimreg_control_r();
	uint8_t do_bimreg_vector_r();

	// write register handlers
	void do_bimreg_control_w(uint8_t data);
	void do_bimreg_vector_w(uint8_t vector);

	DECLARE_WRITE_LINE_MEMBER( int_w );
	devcb_read8 m_out_iack_cb;
	uint8_t m_int_state;

	// Register state
	uint8_t m_control;
	uint8_t m_vector;

protected:
	enum
	{
		NONE     = 0,
		PENDING  = 1,
	};

	enum
	{
		RCV_IDLE     = 0,
		RCV_SEEKING  = 1,
		RCV_SAMPLING = 2
	};

	enum
	{
		REG_CNTRL_INT_LVL_MSK   = 0x07,
		REG_CNTRL_INT_AUT_DIS   = 0x08,
		REG_CNTRL_INT_ENABLE    = 0x10,
		REG_CNTRL_INT_EXT       = 0x20,
		REG_CNTRL_INT_AUT_CLR   = 0x40,
		REG_CNTRL_INT_FLAG      = 0x80,
	};
	int m_int;      // interrupt request from connected device
	int m_index;    // Which channel am I?
	bim68153_device *m_bim; // my device
};


class bim68153_device : public device_t
{
	friend class bim68153_channel;

public:
	// construction/destruction
	bim68153_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);

	u16 iack(int irqline);
	int acknowledge();
	int get_irq_level();

	auto out_int_callback() { return m_out_int_cb.bind(); }

	// These callback set INTAL0 and INTAL1 but are probably not needed as the
	// shorthand OUT_IACK0..OUT_IACK3 below embed the channel information
	auto out_intal0_callback() { return m_out_intal0_cb.bind(); }
	auto out_intal1_callback() { return m_out_intal1_cb.bind(); }

	// LOCAL IACK callbacks emulating the INTAL0 and INTAL1 outputs for INTAE requesting a vector from a sub device
	template <unsigned Bit> auto out_iack_callback() { return m_chn[Bit]->m_out_iack_cb.bind(); }
	auto out_iack0_callback() { return m_chn[CHN_0]->m_out_iack_cb.bind(); }
	auto out_iack1_callback() { return m_chn[CHN_1]->m_out_iack_cb.bind(); }
	auto out_iack2_callback() { return m_chn[CHN_2]->m_out_iack_cb.bind(); }
	auto out_iack3_callback() { return m_chn[CHN_3]->m_out_iack_cb.bind(); }

	uint8_t read(offs_t offset);
	void write(offs_t offset, uint8_t data);


	DECLARE_WRITE_LINE_MEMBER( iackin_w ) { m_iackin = state; }
	DECLARE_WRITE_LINE_MEMBER( int0_w ) { m_chn[CHN_0]->int_w(state); }
	DECLARE_WRITE_LINE_MEMBER( int1_w ) { m_chn[CHN_1]->int_w(state); }
	DECLARE_WRITE_LINE_MEMBER( int2_w ) { m_chn[CHN_2]->int_w(state); }
	DECLARE_WRITE_LINE_MEMBER( int3_w ) { m_chn[CHN_3]->int_w(state); }

protected:
	bim68153_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, uint32_t variant);

	// device-level overrides
	virtual void device_start() override;
	virtual void device_reset() override;
	virtual void device_add_mconfig(machine_config &config) override;

	void trigger_interrupt(int ch);
	int get_channel_index(bim68153_channel *ch);

	// Register enums
	enum
	{
		REG_CONTROL  = 0x00,
		REG_VECTOR   = 0x04,
		CHN_MSK      = 0x03,
		CHN_0        = 0x00,
		CHN_1        = 0x01,
		CHN_2        = 0x02,
		CHN_3        = 0x03,
	};

	enum
	{
		INT_CHN0 = 0,
		INT_CHN1 = 1,
		INT_CHN2 = 2,
		INT_CHN3 = 3,
	};

	// Variants of BIM
	enum
	{
		TYPE_MC68153   = 0x001,
		TYPE_EI68C153  = 0x002,
	};

	required_device<bim68153_channel> m_chn[4];

	devcb_write_line    m_out_int_cb;

	// iack signalling towards subdevices, see also out_iack_callbacks in each bim68153_channel which overlaps
	devcb_write_line    m_out_intal0_cb;
	devcb_write_line    m_out_intal1_cb;

	// Daisy chain signals
	devcb_read8         m_out_iackout_cb;
	int m_iackin;
	int m_irq_level;
};

class ei68c153_device : public bim68153_device
{
public :
	ei68c153_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
};

// device type definition
DECLARE_DEVICE_TYPE(MC68153,         bim68153_device)
DECLARE_DEVICE_TYPE(EI68C153,        ei68c153_device)
DECLARE_DEVICE_TYPE(MC68153_CHANNEL, bim68153_channel)

#endif // MAME_MACHINE_68153BIM_H