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// 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_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
//**************************************************************************
READ8_MEMBER(at_kbc_device_base::data_r)
{
return m_mcu->upi41_master_r(space, 0U);
}
READ8_MEMBER(at_kbc_device_base::status_r)
{
return m_mcu->upi41_master_r(space, 1U);
}
WRITE8_MEMBER(at_kbc_device_base::data_w)
{
machine().scheduler().synchronize(timer_expired_delegate(FUNC(at_kbc_device_base::write_data), this), unsigned(data));
}
WRITE8_MEMBER(at_kbc_device_base::command_w)
{
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);
}
WRITE8_MEMBER(at_keyboard_controller_device::p2_w)
{
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
//**************************************************************************
READ8_MEMBER(ps2_keyboard_controller_device::data_r)
{
set_kbd_irq(0U);
set_mouse_irq(0U);
return m_mcu->upi41_master_r(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;
}
READ8_MEMBER(ps2_keyboard_controller_device::p1_r)
{
return kbd_data_r() | (mouse_data_r() << 1) | 0xfcU;
}
WRITE8_MEMBER(ps2_keyboard_controller_device::p2_w)
{
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;
}
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