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-rw-r--r--trunk/src/emu/machine/ins8250.h149
1 files changed, 149 insertions, 0 deletions
diff --git a/trunk/src/emu/machine/ins8250.h b/trunk/src/emu/machine/ins8250.h
new file mode 100644
index 00000000000..b3ed0349b55
--- /dev/null
+++ b/trunk/src/emu/machine/ins8250.h
@@ -0,0 +1,149 @@
+/**********************************************************************
+
+ 8250 UART interface and emulation
+
+**********************************************************************/
+
+#ifndef __INS8250_H_
+#define __INS8250_H_
+
+#include "emu.h"
+
+/***************************************************************************
+ CLASS DEFINITIONS
+***************************************************************************/
+struct ins8250_interface
+{
+ devcb_write_line m_out_tx_cb;
+ devcb_write_line m_out_dtr_cb;
+ devcb_write_line m_out_rts_cb;
+ devcb_write_line m_out_int_cb;
+ devcb_write_line m_out_out1_cb;
+ devcb_write_line m_out_out2_cb;
+};
+
+class ins8250_uart_device : public device_t,
+ public device_serial_interface,
+ public ins8250_interface
+{
+public:
+ ins8250_uart_device(const machine_config &mconfig, device_type type, const char* name, const char *tag, device_t *owner, UINT32 clock);
+ DECLARE_WRITE8_MEMBER( ins8250_w );
+ DECLARE_READ8_MEMBER( ins8250_r );
+ DECLARE_WRITE_LINE_MEMBER( dcd_w );
+ DECLARE_WRITE_LINE_MEMBER( dsr_w );
+ DECLARE_WRITE_LINE_MEMBER( ri_w );
+ DECLARE_WRITE_LINE_MEMBER( cts_w );
+ DECLARE_WRITE_LINE_MEMBER( rx_w ) { check_for_start(state); }
+ void input_callback(UINT8 state) { m_input_state = state; }
+
+protected:
+ virtual void device_start();
+ virtual void device_config_complete();
+ virtual void device_reset();
+ virtual void rcv_complete();
+ virtual void tra_complete();
+ virtual void tra_callback();
+
+ virtual void set_fcr(UINT8 data) {}
+ virtual void push_tx(UINT8 data) {}
+ virtual UINT8 pop_rx() { return 0; }
+
+ void trigger_int(int flag);
+ void clear_int(int flag);
+
+ enum {
+ TYPE_INS8250 = 0,
+ TYPE_INS8250A,
+ TYPE_NS16450,
+ TYPE_NS16550,
+ TYPE_NS16550A,
+ TYPE_PC16550D,
+ };
+ int m_device_type;
+ struct {
+ UINT8 thr; /* 0 -W transmitter holding register */
+ UINT8 rbr; /* 0 R- receiver buffer register */
+ UINT8 ier; /* 1 RW interrupt enable register */
+ UINT16 dl; /* 0/1 RW divisor latch (if DLAB = 1) */
+ UINT8 iir; /* 2 R- interrupt identification register */
+ UINT8 fcr;
+ UINT8 lcr; /* 3 RW line control register (bit 7: DLAB) */
+ UINT8 mcr; /* 4 RW modem control register */
+ UINT8 lsr; /* 5 R- line status register */
+ UINT8 msr; /* 6 R- modem status register */
+ UINT8 scr; /* 7 RW scratch register */
+ } m_regs;
+private:
+ UINT8 m_int_pending;
+
+ devcb_resolved_write_line m_out_tx_func;
+ devcb_resolved_write_line m_out_dtr_func;
+ devcb_resolved_write_line m_out_rts_func;
+ devcb_resolved_write_line m_out_int_func;
+ devcb_resolved_write_line m_out_out1_func;
+ devcb_resolved_write_line m_out_out2_func;
+
+ void update_interrupt();
+ void update_clock();
+ void update_msr(int bit, UINT8 state);
+};
+
+class ins8250_device : public ins8250_uart_device
+{
+public:
+ ins8250_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+};
+
+class ns16450_device : public ins8250_uart_device
+{
+public:
+ ns16450_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+};
+
+class ns16550_device : public ins8250_uart_device
+{
+public:
+ ns16550_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+protected:
+ virtual void device_start() { m_timeout = timer_alloc(); ins8250_uart_device::device_start(); }
+ virtual void device_reset();
+ virtual void rcv_complete();
+ virtual void tra_complete();
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
+ virtual void set_fcr(UINT8 data);
+ virtual void push_tx(UINT8 data);
+ virtual UINT8 pop_rx();
+private:
+ void set_timer() { m_timeout->adjust(attotime::from_hz((clock()*4*8)/(m_regs.dl*16))); }
+ int m_rintlvl;
+ UINT8 m_rfifo[16];
+ UINT8 m_tfifo[16];
+ int m_rhead, m_rtail, m_rnum;
+ int m_thead, m_ttail;
+ emu_timer *m_timeout;
+};
+
+extern const device_type INS8250;
+extern const device_type NS16450;
+extern const device_type NS16550;
+
+/***************************************************************************
+ DEVICE CONFIGURATION MACROS
+***************************************************************************/
+
+#define MCFG_INS8250_ADD(_tag, _intrf, _clock) \
+ MCFG_DEVICE_ADD(_tag, INS8250, _clock) \
+ MCFG_DEVICE_CONFIG(_intrf)
+
+
+#define MCFG_NS16450_ADD(_tag, _intrf, _clock) \
+ MCFG_DEVICE_ADD(_tag, NS16450, _clock) \
+ MCFG_DEVICE_CONFIG(_intrf)
+
+
+#define MCFG_NS16550_ADD(_tag, _intrf, _clock) \
+ MCFG_DEVICE_ADD(_tag, NS16550, _clock) \
+ MCFG_DEVICE_CONFIG(_intrf)
+
+#endif