// license:BSD-3-Clause // copyright-holders:smf, Carl /********************************************************************** 8250 UART interface and emulation **********************************************************************/ #ifndef MAME_MACHINE_INS8250_H #define MAME_MACHINE_INS8250_H #pragma once #include "diserial.h" /*************************************************************************** CLASS DEFINITIONS ***************************************************************************/ class ins8250_uart_device : public device_t, public device_serial_interface { public: auto out_tx_callback() { return m_out_tx_cb.bind(); } auto out_dtr_callback() { return m_out_dtr_cb.bind(); } auto out_rts_callback() { return m_out_rts_cb.bind(); } auto out_int_callback() { return m_out_int_cb.bind(); } auto out_out1_callback() { return m_out_out1_cb.bind(); } auto out_out2_callback() { return m_out_out2_cb.bind(); } void ins8250_w(offs_t offset, u8 data); u8 ins8250_r(offs_t offset); void dcd_w(int state); void dsr_w(int state); void ri_w(int state); void cts_w(int state); void rx_w(int state); int intrpt_r(); protected: enum class dev_type { INS8250, INS8250A, NS16450, NS16550, NS16550A }; ins8250_uart_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, dev_type device_type); virtual void device_start() override; virtual void device_reset() override; virtual void rcv_complete() override; virtual void tra_complete() override; virtual void tra_callback() override; virtual void set_fcr(u8 data) { } virtual void push_tx(u8 data) { } virtual u8 pop_rx() { return 0; } void trigger_int(int flag); void clear_int(int flag); void update_baud_rate(); const dev_type m_device_type; struct { u8 thr; /* 0 -W transmitter holding register */ u8 rbr; /* 0 R- receiver buffer register */ u8 ier; /* 1 RW interrupt enable register */ u16 dl; /* 0/1 RW divisor latch (if DLAB = 1) */ u8 iir; /* 2 R- interrupt identification register */ u8 fcr; u8 lcr; /* 3 RW line control register (bit 7: DLAB) */ u8 mcr; /* 4 RW modem control register */ u8 lsr; /* 5 R- line status register */ u8 msr; /* 6 R- modem status register */ u8 scr; /* 7 RW scratch register */ } m_regs; private: u8 m_int_pending; 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; void update_interrupt(); void update_msr(); int m_txd; int m_rxd; int m_dcd; int m_dsr; int m_ri; int m_cts; }; class ins8250_device : public ins8250_uart_device { public: ins8250_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock); }; class ns16450_device : public ins8250_uart_device { public: ns16450_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock); }; class ns16550_device : public ins8250_uart_device { public: ns16550_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock); protected: virtual void device_start() override; virtual void device_reset() override; virtual void rcv_complete() override; virtual void tra_complete() override; virtual void set_fcr(u8 data) override; virtual void push_tx(u8 data) override; virtual u8 pop_rx() override; TIMER_CALLBACK_MEMBER(timeout_expired); private: void set_timer() { m_timeout->adjust(attotime::from_hz((clock()*4*8)/(m_regs.dl*16))); } int m_rintlvl; u8 m_rfifo[16]; u8 m_efifo[16]; u8 m_tfifo[16]; int m_rhead, m_rtail, m_rnum; int m_thead, m_ttail; emu_timer *m_timeout; }; class pc16552_device : public device_t { public: pc16552_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock); u8 read(offs_t offset) { return ((offset & 8) ? m_chan1 : m_chan0)->ins8250_r(offset & 7); } void write(offs_t offset, u8 data) { ((offset & 8) ? m_chan1 : m_chan0)->ins8250_w(offset & 7, data); } protected: virtual void device_start() override; private: ns16550_device *m_chan0; ns16550_device *m_chan1; }; DECLARE_DEVICE_TYPE(PC16552D, pc16552_device) DECLARE_DEVICE_TYPE(INS8250, ins8250_device) DECLARE_DEVICE_TYPE(NS16450, ns16450_device) DECLARE_DEVICE_TYPE(NS16550, ns16550_device) #endif // MAME_MACHINE_INS8250_H