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https://github.com/holub/mame
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i8089.c: go thru initialization
This commit is contained in:
Dirk Best
parent
af3f2242cd
commit
2ef54e2487
@ -14,6 +14,50 @@
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#define VERBOSE 1
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//**************************************************************************
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// I/O CHANNEL
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//**************************************************************************
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const device_type I8089_CHANNEL = &device_creator<i8089_channel>;
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class i8089_channel : public device_t,
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public device_execute_interface
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{
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public:
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// construction/destruction
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i8089_channel(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
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protected:
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// device-level overrides
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virtual void device_start();
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virtual void execute_run();
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int m_icount;
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};
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i8089_channel::i8089_channel(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
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device_t(mconfig, I8089_CHANNEL, "Intel 8089 I/O Channel", tag, owner, clock, "i8089_channel", __FILE__),
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device_execute_interface(mconfig, *this),
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m_icount(0)
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{
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}
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void i8089_channel::device_start()
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{
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// set our instruction counter
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m_icountptr = &m_icount;
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}
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void i8089_channel::execute_run()
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{
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do
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{
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m_icount--;
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}
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while (m_icount > 0);
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}
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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@ -31,8 +75,17 @@ const device_type I8089 = &device_creator<i8089_device>;
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i8089_device::i8089_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
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device_t(mconfig, I8089, "Intel 8089", tag, owner, clock, "i8089", __FILE__),
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m_ch1(*this, "1"),
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m_ch2(*this, "2"),
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m_write_sintr1(*this),
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m_write_sintr2(*this)
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m_write_sintr2(*this),
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m_16bit_system(false),
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m_16bit_remote(false),
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m_master(false),
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m_request_grant(false),
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m_control_block(0),
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m_ca(0),
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m_sel(0)
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{
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}
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@ -48,9 +101,22 @@ void i8089_device::static_set_cputag(device_t &device, const char *tag)
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void i8089_device::device_start()
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{
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// make sure our channels have been setup first
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if (!m_ch1->started() || !m_ch2->started())
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throw device_missing_dependencies();
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// resolve callbacks
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m_write_sintr1.resolve_safe();
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m_write_sintr2.resolve_safe();
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// get pointers to memory
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device_t *cpu = machine().device(m_cputag);
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m_mem = &cpu->memory().space(AS_PROGRAM);
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m_io = &cpu->memory().space(AS_IO);
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// initialize channel clock
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m_ch1->set_unscaled_clock(clock());
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m_ch2->set_unscaled_clock(clock());
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}
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//-------------------------------------------------
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@ -59,6 +125,85 @@ void i8089_device::device_start()
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void i8089_device::device_reset()
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{
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m_initialized = false;
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}
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//-------------------------------------------------
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// machine_config_additions - device-specific
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// machine configurations
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//-------------------------------------------------
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static MACHINE_CONFIG_FRAGMENT( i8089 )
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MCFG_DEVICE_ADD("1", I8089_CHANNEL, 0)
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MCFG_DEVICE_ADD("2", I8089_CHANNEL, 0)
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MACHINE_CONFIG_END
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machine_config_constructor i8089_device::device_mconfig_additions() const
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{
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return MACHINE_CONFIG_NAME( i8089 );
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}
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//**************************************************************************
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// IMPLEMENTATION
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//**************************************************************************
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void i8089_device::initialize()
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{
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assert(!m_initialized);
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// get system bus width
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UINT8 sys_bus = m_mem->read_byte(0xffff6);
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m_16bit_system = BIT(sys_bus, 0);
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// get system configuration block address
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UINT16 scb_offset = read_word(0xffff8);
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UINT16 scb_segment = read_word(0xffffa);
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offs_t scb_address = (scb_segment << 4) + scb_offset;
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// get system operation command
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UINT16 soc = read_word(scb_address);
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m_16bit_remote = BIT(soc, 0);
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m_request_grant = BIT(soc, 1);
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m_master = !m_sel;
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UINT16 cb_offset = read_word(scb_address + 2);
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UINT16 cb_segment = read_word(scb_address + 4);
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m_control_block = (cb_segment << 4) + cb_offset;
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// todo: set/clear busy
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m_initialized = true;
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// output some debug info
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if (VERBOSE)
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{
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logerror("%s('%s'): initializing\n", shortname(), basetag());
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logerror("%s('%s'): %s system bus\n", shortname(), basetag(), m_16bit_system ? "16-bit" : "8-bit");
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logerror("%s('%s'): system configuration block location: %06x\n", shortname(), basetag(), scb_address);
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logerror("%s('%s'): %s remote bus\n", shortname(), basetag(), m_16bit_remote ? "16-bit" : "8-bit");
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logerror("%s('%s'): request/grant: %d\n", shortname(), basetag(), m_request_grant);
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logerror("%s('%s'): is %s\n", shortname(), basetag(), m_master ? "master" : "slave");
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logerror("%s('%s'): channel control block location: %06x\n", shortname(), basetag(), m_control_block);
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}
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}
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UINT16 i8089_device::read_word(offs_t address)
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{
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assert(m_initialized);
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UINT16 data = 0xffff;
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if (m_16bit_system)
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{
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data = m_mem->read_word(address);
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}
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else
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{
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data = m_mem->read_byte(address);
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data |= m_mem->read_byte(address + 1) << 8;
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}
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return data;
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}
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@ -70,12 +215,22 @@ WRITE_LINE_MEMBER( i8089_device::ca_w )
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{
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if (VERBOSE)
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logerror("%s('%s'): ca_w: %u\n", shortname(), basetag(), state);
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if (m_ca == 1 && state == 0)
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{
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if (!m_initialized)
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initialize();
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}
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m_ca = state;
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}
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WRITE_LINE_MEMBER( i8089_device::sel_w )
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{
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if (VERBOSE)
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logerror("%s('%s'): sel_w: %u\n", shortname(), basetag(), state);
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m_sel = state;
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}
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WRITE_LINE_MEMBER( i8089_device::drq1_w )
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@ -18,7 +18,7 @@
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#define MCFG_I8089_ADD(_tag, _clock, _cputag) \
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MCFG_DEVICE_ADD(_tag, I8089, _clock) \
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i8089_device::static_set_cputag(*device, _cputag); \
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i8089_device::static_set_cputag(*device, _cputag);
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#define MCFG_I8089_SINTR1(_sintr1) \
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downcast<i8089_device *>(device)->set_sintr1_callback(DEVCB2_##_sintr1);
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@ -31,6 +31,9 @@
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// TYPE DEFINITIONS
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//**************************************************************************
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// forward declaration
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class i8089_channel;
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// ======================> i8089_device
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class i8089_device : public device_t
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@ -59,12 +62,38 @@ protected:
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virtual void device_start();
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virtual void device_reset();
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// optional information overrides
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virtual machine_config_constructor device_mconfig_additions() const;
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private:
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required_device<i8089_channel> m_ch1;
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required_device<i8089_channel> m_ch2;
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devcb2_write_line m_write_sintr1;
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devcb2_write_line m_write_sintr2;
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void initialize();
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UINT16 read_word(offs_t address);
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// internal state
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const char *m_cputag;
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address_space *m_mem;
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address_space *m_io;
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// system configuration
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bool m_initialized;
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bool m_16bit_system;
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bool m_16bit_remote;
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bool m_master;
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bool m_request_grant;
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// control block location
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offs_t m_control_block;
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// state of input pins
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int m_ca;
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int m_sel;
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};
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