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https://github.com/holub/mame
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Imported I8214 PIC from MESS. (no whatsnew)
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Curt Coder
parent
009a270864
commit
87a69b25ae
2
.gitattributes
vendored
2
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vendored
@ -789,6 +789,8 @@ src/emu/machine/i8155.c svneol=native#text/plain
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src/emu/machine/i8155.h svneol=native#text/plain
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src/emu/machine/i8212.c svneol=native#text/plain
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src/emu/machine/i8212.h svneol=native#text/plain
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src/emu/machine/i8214.c svneol=native#text/plain
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src/emu/machine/i8214.h svneol=native#text/plain
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src/emu/machine/i8243.c svneol=native#text/plain
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src/emu/machine/i8243.h svneol=native#text/plain
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src/emu/machine/i8255a.c svneol=native#text/plain
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@ -171,6 +171,7 @@ EMUMACHINEOBJS = \
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$(EMUMACHINE)/i2cmem.o \
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$(EMUMACHINE)/i8155.o \
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$(EMUMACHINE)/i8212.o \
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$(EMUMACHINE)/i8214.o \
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$(EMUMACHINE)/i8243.o \
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$(EMUMACHINE)/i8255a.o \
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$(EMUMACHINE)/i8355.o \
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239
src/emu/machine/i8214.c
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239
src/emu/machine/i8214.c
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@ -0,0 +1,239 @@
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/**********************************************************************
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Intel 8214 Priority Interrupt Controller emulation
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Copyright MESS Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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**********************************************************************/
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#include "emu.h"
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#include "i8214.h"
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#include "machine/devhelpr.h"
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//**************************************************************************
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// MACROS / CONSTANTS
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//**************************************************************************
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#define LOG 0
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//**************************************************************************
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// GLOBAL VARIABLES
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//**************************************************************************
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// devices
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const device_type I8214 = i8214_device_config::static_alloc_device_config;
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//**************************************************************************
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// DEVICE CONFIGURATION
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//**************************************************************************
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GENERIC_DEVICE_CONFIG_SETUP(i8214, "I8214")
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//-------------------------------------------------
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// device_config_complete - perform any
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// operations now that the configuration is
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// complete
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//-------------------------------------------------
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void i8214_device_config::device_config_complete()
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{
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// inherit a copy of the static data
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const i8214_interface *intf = reinterpret_cast<const i8214_interface *>(static_config());
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if (intf != NULL)
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*static_cast<i8214_interface *>(this) = *intf;
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// or initialize to defaults if none provided
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else
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{
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memset(&m_out_int_func, 0, sizeof(m_out_int_func));
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memset(&m_out_enlg_func, 0, sizeof(m_out_enlg_func));
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}
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}
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//**************************************************************************
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// INLINE HELPERS
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//**************************************************************************
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//-------------------------------------------------
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// trigger_interrupt -
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//-------------------------------------------------
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inline void i8214_device::trigger_interrupt(int level)
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{
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if (LOG) logerror("I8214 '%s' Interrupt Level %u\n", tag(), level);
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m_a = level;
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// disable interrupts
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m_int_dis = 1;
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// disable next level group
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devcb_call_write_line(&m_out_enlg_func, 0);
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// toggle interrupt line
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devcb_call_write_line(&m_out_int_func, ASSERT_LINE);
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devcb_call_write_line(&m_out_int_func, CLEAR_LINE);
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}
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//-------------------------------------------------
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// check_interrupt -
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//-------------------------------------------------
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inline void i8214_device::check_interrupt()
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{
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int level;
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if (m_int_dis || !m_etlg) return;
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for (level = 7; level >= 0; level--)
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{
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if (!BIT(m_r, 7 - level))
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{
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if (m_sgs)
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{
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if (level > m_b)
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{
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trigger_interrupt(level);
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}
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}
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else
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{
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trigger_interrupt(level);
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}
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}
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}
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}
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// i8214_device - constructor
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//-------------------------------------------------
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i8214_device::i8214_device(running_machine &_machine, const i8214_device_config &config)
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: device_t(_machine, config),
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m_config(config)
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void i8214_device::device_start()
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{
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// resolve callbacks
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devcb_resolve_write_line(&m_out_int_func, &m_config.m_out_int_func, this);
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devcb_resolve_write_line(&m_out_enlg_func, &m_config.m_out_enlg_func, this);
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// register for state saving
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save_item(NAME(m_inte));
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save_item(NAME(m_int_dis));
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save_item(NAME(m_a));
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save_item(NAME(m_b));
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save_item(NAME(m_r));
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save_item(NAME(m_sgs));
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save_item(NAME(m_etlg));
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}
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//-------------------------------------------------
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// a_r -
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//-------------------------------------------------
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UINT8 i8214_device::a_r()
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{
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UINT8 a = m_a & 0x07;
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if (LOG) logerror("I8214 '%s' A: %01x\n", tag(), a);
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return a;
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}
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//-------------------------------------------------
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// b_w -
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//-------------------------------------------------
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void i8214_device::b_w(UINT8 data)
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{
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m_b = data & 0x07;
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if (LOG) logerror("I8214 '%s' B: %01x\n", tag(), m_b);
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// enable interrupts
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m_int_dis = 0;
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// enable next level group
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devcb_call_write_line(&m_out_enlg_func, 1);
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check_interrupt();
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}
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//-------------------------------------------------
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// r_w -
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//-------------------------------------------------
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void i8214_device::r_w(UINT8 data)
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{
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if (LOG) logerror("I8214 '%s' R: %02x\n", tag(), data);
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m_r = data;
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check_interrupt();
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}
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//-------------------------------------------------
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// sgs_w -
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//-------------------------------------------------
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WRITE_LINE_MEMBER( i8214_device::sgs_w )
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{
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if (LOG) logerror("I8214 '%s' SGS: %u\n", tag(), state);
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m_sgs = state;
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check_interrupt();
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}
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//-------------------------------------------------
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// etlg_w -
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//-------------------------------------------------
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WRITE_LINE_MEMBER( i8214_device::etlg_w )
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{
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if (LOG) logerror("I8214 '%s' ETLG: %u\n", tag(), state);
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m_etlg = state;
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}
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//-------------------------------------------------
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// inte_w -
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//-------------------------------------------------
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WRITE_LINE_MEMBER( i8214_device::inte_w )
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{
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if (LOG) logerror("I8214 '%s' INTE: %u\n", tag(), state);
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m_inte = state;
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}
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129
src/emu/machine/i8214.h
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129
src/emu/machine/i8214.h
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@ -0,0 +1,129 @@
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/**********************************************************************
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Intel 8214 Priority Interrupt Controller emulation
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Copyright MESS Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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**********************************************************************
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_____ _____
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_B0 1 |* \_/ | 24 Vcc
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_B1 2 | | 23 _ECS
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_B2 3 | | 22 _R7
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_SGS 4 | | 21 _R6
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_INT 5 | | 20 _R5
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_CLK 6 | 8214 | 19 _R4
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INTE 7 | | 18 _R3
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_A0 8 | | 17 _R2
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_A1 9 | | 16 _R1
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_A2 10 | | 15 _R0
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_ELR 11 | | 14 ENLG
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GND 12 |_____________| 13 ETLG
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**********************************************************************/
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#pragma once
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#ifndef __I8214__
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#define __I8214__
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#include "emu.h"
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///*************************************************************************
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// INTERFACE CONFIGURATION MACROS
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///*************************************************************************
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#define MCFG_I8214_ADD(_tag, _clock, _config) \
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MCFG_DEVICE_ADD(_tag, I8214, _clock) \
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MCFG_DEVICE_CONFIG(_config)
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#define I8214_INTERFACE(name) \
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const i8214_interface (name) =
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///*************************************************************************
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// TYPE DEFINITIONS
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///*************************************************************************
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// ======================> i8214_interface
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struct i8214_interface
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{
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devcb_write_line m_out_int_func;
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devcb_write_line m_out_enlg_func;
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};
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// ======================> i8214_device_config
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class i8214_device_config : public device_config,
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public i8214_interface
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{
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friend class i8214_device;
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// construction/destruction
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i8214_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock);
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public:
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// allocators
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static device_config *static_alloc_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock);
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virtual device_t *alloc_device(running_machine &machine) const;
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protected:
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// device_config overrides
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virtual void device_config_complete();
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};
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// ======================> i8214_device
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class i8214_device : public device_t
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{
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friend class i8214_device_config;
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// construction/destruction
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i8214_device(running_machine &_machine, const i8214_device_config &_config);
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public:
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DECLARE_WRITE_LINE_MEMBER( sgs_w );
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DECLARE_WRITE_LINE_MEMBER( etlg_w );
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DECLARE_WRITE_LINE_MEMBER( inte_w );
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UINT8 a_r();
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void b_w(UINT8 data);
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void r_w(UINT8 data);
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protected:
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// device-level overrides
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virtual void device_start();
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private:
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inline void trigger_interrupt(int level);
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inline void check_interrupt();
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devcb_resolved_write_line m_out_int_func;
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devcb_resolved_write_line m_out_enlg_func;
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int m_inte; // interrupt enable
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int m_int_dis; // interrupt disable flip-flop
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int m_a; // request level
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int m_b; // current status register
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UINT8 m_r; // interrupt request latch
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int m_sgs; // status group select
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int m_etlg; // enable this level group
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const i8214_device_config &m_config;
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};
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// device type definition
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extern const device_type I8214;
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#endif
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