summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/machine/at_keybc.cpp
blob: 5e6ac7795698339a498144536948d41ce5a22af3 (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
// license:BSD-3-Clause
// copyright-holders:Vas Crabb
/***************************************************************************

    IBM PC/AT and PS/2 keyboard controllers

    IBM used Intel UPI-41 microcontrollers to implement bidirectional
    keyboard communication from the PC/AT and PS/2.  On the PS/2, the
    microcontroller also handles mouse communication.  The PS/2 host
    interface to the keyboard/mouse controller is backwards-compatible
    for documented commands.  However a number of undocumented commands
    are no longer implemented, the pin assignments are different, and
    interrupt outputs are latched externally using a 74ALS74 at ZM87.

    PC/AT I/O pin assignments:
    P10:    NC              no connection
    P11:    NC              no connection
    P12:    NC              no connection
    P13:    NC              no connection
    P14:    -RAM SEL        enable external RAM         low disables
    P15:                    manufacturing setting       low disables
    P16:    SW1             CRT adapter switch          low for CGA
    P17:    +KBD INH        inhibit keyboard            active low
    P20:    RC              reset CPU                   active low
    P21:    A20 GATE        enable A20 line             active high
    P22:    NC              no connection
    P23:    NC              no connection
    P24:    +OPT BUF FULL   output buffer full          active high
    P25:    NC              no connection
    P26:                    open collector KBD CLK      inverted
    P27:                    open collector KBD DATA     not inverted
    TEST0:  KBD CLK                                     not inverted
    TEST1:  KBD DATA                                    not inverted

    PS/2 I/O pin assignments
    P10:    KYBD DATA                                   not inverted
    P11:    MOUSE DATA                                  not inverted
    P12:                    keyboard/mouse power fuse   low if blown
    P13:                    no connection
    P14:                    no connection
    P15:                    no connection
    P16:                    no connection
    P17:                    no connection
    P20:    +HOT RES        reset CPU                   inverted
    P21:    A20 PASS        enable A20 line             not inverted
    P22:                    open collector MOUSE DATA   inverted
    P23:                    open collector MOUSE CLK    inverted
    P24:                    latched as BIRQ1            rising trigger
    P25:                    latched as IRQ12            rising trigger
    P26:                    open collector KYBD CLK     inverted
    P27:                    open collector KYBD DATA    inverted
    TEST0:  KYBD CLK                                    not inverted
    TEST1:  MOUSE CLK                                   not inverted

    Notes:
    * PS/2 BIRQ1 and IRQ12 are cleard by reading data.
    * PS/2 BIRQ1 and IRQ12 are active low, but we use ASSERT_LINE here.
    * PS/2 IRQ12 is open collector for sharing with cards.

    TODO:
    * Move display type and key lock controls to drivers.
    * Expose power fuse failure.

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

#include "emu.h"
#include "at_keybc.h"

namespace {

ROM_START(at_kbc)
	ROM_REGION(0x0800, "mcu", 0)
	ROM_SYSTEM_BIOS(0, "ibm", "IBM 1983") // 1983 IBM controller BIOS
	ROMX_LOAD("1503033.bin", 0x0000, 0x0800, CRC(5a81c0d2) SHA1(0100f8789fb4de74706ae7f9473a12ec2b9bd729), ROM_BIOS(0))
	ROM_SYSTEM_BIOS(1, "ptl", "PTL 1986") // unknown controller BIOS, (c) 1985, 1986 PTL
	ROMX_LOAD("yan25d05.bin", 0x0000, 0x0800, CRC(70c798f1) SHA1(ae9a79c7184a17331b70a50035ff63c757df094c), ROM_BIOS(1))
	ROM_SYSTEM_BIOS(2, "award15", "Award 1985 V1.5") // MIPS Rx2030 i8742 keyboard controller
	ROMX_LOAD("keyboard_1.5.bin", 0x0000, 0x0800, CRC(f86ba0f7) SHA1(1ad475451db35a76d929824c035d582279fbe3a3), ROM_BIOS(2))
ROM_END

ROM_START(ps2_kbc)
	ROM_REGION(0x0800, "mcu", 0)
	ROM_LOAD("72x8455.zm82", 0x0000, 0x0800, CRC(7da223d3) SHA1(54c52ff6c6a2310f79b2c7e6d1259be9de868f0e))
ROM_END

INPUT_PORTS_START(at_kbc)
	PORT_START("P1")
	PORT_BIT(0x3f, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_CONFNAME(0x40, 0x00, "CRT Adapter Switch")
	PORT_CONFSETTING(   0x40, "Monochrome Display Adapter")
	PORT_CONFSETTING(   0x00, "Color Graphics Adapter")
	PORT_CONFNAME(0x80, 0x80, "Key Lock")
	PORT_CONFSETTING(   0x80, DEF_STR(Off))
	PORT_CONFSETTING(   0x00, DEF_STR(On))
INPUT_PORTS_END

} // anonymous namespace



//**************************************************************************
//  DEVICE TYPES
//**************************************************************************

DEFINE_DEVICE_TYPE(AT_KEYBOARD_CONTROLLER, at_keyboard_controller_device, "at_keybc", "PC/AT Keyboard Controller")
DEFINE_DEVICE_TYPE(PS2_KEYBOARD_CONTROLLER, ps2_keyboard_controller_device, "ps2_keybc", "PS/2 Keyboard/Mouse Controller")


//**************************************************************************
//  KEYBOARD CONTROLLER DEVICE BASE
//**************************************************************************

uint8_t at_kbc_device_base::data_r()
{
	return m_mcu->upi41_master_r(machine().dummy_space(), 0U);
}

uint8_t at_kbc_device_base::status_r()
{
	return m_mcu->upi41_master_r(machine().dummy_space(), 1U);
}

void at_kbc_device_base::data_w(uint8_t data)
{
	machine().scheduler().synchronize(timer_expired_delegate(FUNC(at_kbc_device_base::write_data), this), unsigned(data));
}

void at_kbc_device_base::command_w(uint8_t data)
{
	machine().scheduler().synchronize(timer_expired_delegate(FUNC(at_kbc_device_base::write_command), this), unsigned(data));
}

WRITE_LINE_MEMBER(at_kbc_device_base::kbd_clk_w)
{
	machine().scheduler().synchronize(timer_expired_delegate(FUNC(at_kbc_device_base::set_kbd_clk_in), this), state);
}

WRITE_LINE_MEMBER(at_kbc_device_base::kbd_data_w)
{
	machine().scheduler().synchronize(timer_expired_delegate(FUNC(at_kbc_device_base::set_kbd_data_in), this), state);
}

at_kbc_device_base::at_kbc_device_base(machine_config const &mconfig, device_type type, char const *tag, device_t *owner, u32 clock)
	: device_t(mconfig, type, tag, owner, clock)
	, m_mcu(*this, "mcu")
	, m_hot_res_cb(*this), m_gate_a20_cb(*this), m_kbd_irq_cb(*this)
	, m_kbd_clk_cb(*this), m_kbd_data_cb(*this)
	, m_hot_res(0U), m_gate_a20(0U), m_kbd_irq(0U)
	, m_kbd_clk_in(1U), m_kbd_clk_out(1U), m_kbd_data_in(1U), m_kbd_data_out(1U)
{
}

void at_kbc_device_base::device_resolve_objects()
{
	m_hot_res_cb.resolve_safe();
	m_gate_a20_cb.resolve_safe();
	m_kbd_irq_cb.resolve_safe();
	m_kbd_clk_cb.resolve_safe();
	m_kbd_data_cb.resolve_safe();
}

void at_kbc_device_base::device_start()
{
	save_item(NAME(m_hot_res));
	save_item(NAME(m_gate_a20));
	save_item(NAME(m_kbd_irq));
	save_item(NAME(m_kbd_clk_in));
	save_item(NAME(m_kbd_clk_out));
	save_item(NAME(m_kbd_data_in));
	save_item(NAME(m_kbd_data_out));

	m_hot_res = m_gate_a20 = m_kbd_irq = 0U;
	m_kbd_clk_in = m_kbd_clk_out = 1U;
	m_kbd_data_in = m_kbd_data_out = 1U;
}

inline void at_kbc_device_base::set_hot_res(u8 state)
{
	if (state != m_hot_res)
		m_hot_res_cb((m_hot_res = state) ? ASSERT_LINE : CLEAR_LINE);
}

inline void at_kbc_device_base::set_gate_a20(u8 state)
{
	if (state != m_gate_a20)
		m_gate_a20_cb((m_gate_a20 = state) ? ASSERT_LINE : CLEAR_LINE);
}

inline void at_kbc_device_base::set_kbd_irq(u8 state)
{
	if (state != m_kbd_irq)
		m_kbd_irq_cb((m_kbd_irq = state) ? ASSERT_LINE : CLEAR_LINE);
}

inline void at_kbc_device_base::set_kbd_clk_out(u8 state)
{
	if (state != m_kbd_clk_out)
		m_kbd_clk_cb(m_kbd_clk_out = state);
}

inline void at_kbc_device_base::set_kbd_data_out(u8 state)
{
	if (state != m_kbd_data_out)
		m_kbd_data_cb(m_kbd_data_out = state);
}

inline u8 at_kbc_device_base::kbd_clk_r() const
{
	return m_kbd_clk_in & m_kbd_clk_out;
}

inline u8 at_kbc_device_base::kbd_data_r() const
{
	return m_kbd_data_in & m_kbd_data_out;
}

TIMER_CALLBACK_MEMBER(at_kbc_device_base::write_data)
{
	m_mcu->upi41_master_w(machine().dummy_space(), 0U, u8(u32(param)));
}

TIMER_CALLBACK_MEMBER(at_kbc_device_base::write_command)
{
	m_mcu->upi41_master_w(machine().dummy_space(), 1U, u8(u32(param)));
}

TIMER_CALLBACK_MEMBER(at_kbc_device_base::set_kbd_clk_in)
{
	m_kbd_clk_in = param ? 1U : 0U;
}

TIMER_CALLBACK_MEMBER(at_kbc_device_base::set_kbd_data_in)
{
	m_kbd_data_in = param ? 1U : 0U;
}


//**************************************************************************
//  PC/AT KEYBOARD CONTROLLER DEVICE
//**************************************************************************

at_keyboard_controller_device::at_keyboard_controller_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock)
	: at_kbc_device_base(mconfig, AT_KEYBOARD_CONTROLLER, tag, owner, clock)
{
}

tiny_rom_entry const *at_keyboard_controller_device::device_rom_region() const
{
	return ROM_NAME(at_kbc);
}

void at_keyboard_controller_device::device_add_mconfig(machine_config &config)
{
	I8042(config, m_mcu, DERIVED_CLOCK(1, 1));
	m_mcu->p1_in_cb().set_ioport("P1");
	m_mcu->p1_out_cb().set_nop();
	m_mcu->p2_in_cb().set_constant(0xffU);
	m_mcu->p2_out_cb().set(FUNC(at_keyboard_controller_device::p2_w));
	m_mcu->t0_in_cb().set([this] () { return kbd_clk_r(); });
	m_mcu->t1_in_cb().set([this] () { return kbd_data_r(); });
}

ioport_constructor at_keyboard_controller_device::device_input_ports() const
{
	return INPUT_PORTS_NAME(at_kbc);
}

void at_keyboard_controller_device::p2_w(uint8_t data)
{
	set_hot_res(BIT(~data, 0));
	set_gate_a20(BIT(data, 1));
	set_kbd_irq(BIT(data, 4));
	set_kbd_clk_out(BIT(~data, 6));
	set_kbd_data_out(BIT(data, 7));
}


//**************************************************************************
//  PS/2 KEYBOARD/MOUSE CONTROLLER DEVICE
//**************************************************************************

uint8_t ps2_keyboard_controller_device::data_r()
{
	set_kbd_irq(0U);
	set_mouse_irq(0U);
	return m_mcu->upi41_master_r(machine().dummy_space(), 0U);
}

WRITE_LINE_MEMBER(ps2_keyboard_controller_device::mouse_clk_w)
{
	machine().scheduler().synchronize(timer_expired_delegate(FUNC(ps2_keyboard_controller_device::set_mouse_clk_in), this), state);
}

WRITE_LINE_MEMBER(ps2_keyboard_controller_device::mouse_data_w)
{
	machine().scheduler().synchronize(timer_expired_delegate(FUNC(ps2_keyboard_controller_device::set_mouse_data_in), this), state);
}

ps2_keyboard_controller_device::ps2_keyboard_controller_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock)
	: at_kbc_device_base(mconfig, PS2_KEYBOARD_CONTROLLER, tag, owner, clock)
	, m_mouse_irq_cb(*this)
	, m_mouse_clk_cb(*this), m_mouse_data_cb(*this)
	, m_mouse_irq(0U)
	, m_mouse_clk_in(1U), m_mouse_clk_out(1U), m_mouse_data_in(1U), m_mouse_data_out(1U)
	, m_p2_data(0xffU)
{
}

tiny_rom_entry const *ps2_keyboard_controller_device::device_rom_region() const
{
	return ROM_NAME(ps2_kbc);
}

void ps2_keyboard_controller_device::device_add_mconfig(machine_config &config)
{
	I8042(config, m_mcu, DERIVED_CLOCK(1, 1));
	m_mcu->p1_in_cb().set(FUNC(ps2_keyboard_controller_device::p1_r));
	m_mcu->p1_out_cb().set_nop();
	m_mcu->p2_in_cb().set_constant(0xffU);
	m_mcu->p2_out_cb().set(FUNC(ps2_keyboard_controller_device::p2_w));
	m_mcu->t0_in_cb().set([this] () { return kbd_clk_r(); });
	m_mcu->t1_in_cb().set([this] () { return mouse_clk_r(); });
}

void ps2_keyboard_controller_device::device_resolve_objects()
{
	at_kbc_device_base::device_resolve_objects();

	m_mouse_clk_cb.resolve_safe();
	m_mouse_data_cb.resolve_safe();
}

void ps2_keyboard_controller_device::device_start()
{
	at_kbc_device_base::device_start();

	save_item(NAME(m_mouse_irq));
	save_item(NAME(m_mouse_clk_in));
	save_item(NAME(m_mouse_clk_out));
	save_item(NAME(m_mouse_data_in));
	save_item(NAME(m_mouse_data_out));
	save_item(NAME(m_p2_data));

	m_mouse_irq = 0U;
	m_mouse_clk_in = m_mouse_clk_out = 1U;
	m_mouse_data_in = m_mouse_data_out = 1U;
	m_p2_data = 0xffU;
}

inline void ps2_keyboard_controller_device::set_mouse_irq(u8 state)
{
	if (state != m_mouse_irq)
		m_mouse_irq_cb((m_mouse_irq = state) ? ASSERT_LINE : CLEAR_LINE);
}

inline void ps2_keyboard_controller_device::set_mouse_clk_out(u8 state)
{
	if (state != m_mouse_clk_out)
		m_mouse_clk_cb(m_mouse_clk_out = state);
}

inline void ps2_keyboard_controller_device::set_mouse_data_out(u8 state)
{
	if (state != m_mouse_data_out)
		m_mouse_data_cb(m_mouse_data_out = state);
}

inline u8 ps2_keyboard_controller_device::mouse_clk_r() const
{
	return m_mouse_clk_in & m_mouse_clk_out;
}

inline u8 ps2_keyboard_controller_device::mouse_data_r() const
{
	return m_mouse_data_in & m_mouse_data_out;
}

TIMER_CALLBACK_MEMBER(ps2_keyboard_controller_device::set_mouse_clk_in)
{
	m_mouse_clk_in = param ? 1U : 0U;
}

TIMER_CALLBACK_MEMBER(ps2_keyboard_controller_device::set_mouse_data_in)
{
	m_mouse_data_in = param ? 1U : 0U;
}

uint8_t ps2_keyboard_controller_device::p1_r()
{
	return kbd_data_r() | (mouse_data_r() << 1) | 0xfcU;
}

void ps2_keyboard_controller_device::p2_w(uint8_t data)
{
	set_hot_res(BIT(~data, 0));
	set_gate_a20(BIT(data, 1));
	set_mouse_data_out(BIT(~data, 2));
	set_mouse_clk_out(BIT(~data, 3));
	set_kbd_clk_out(BIT(~data, 6));
	set_kbd_data_out(BIT(~data, 7));

	if (BIT(data & ~m_p2_data, 4))
		set_kbd_irq(1U);
	if (BIT(data & ~m_p2_data, 5))
		set_mouse_irq(1U);
	m_p2_data = data;
}