uart.h

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

/*
 * This software is Copyright (C) 1998 by T.sqware - all rights limited
 * It is provided in to the public domain "as is", can be freely modified
 * as far as this copyight notice is kept unchanged, but does not imply
 * an endorsement by T.sqware of the product in which it is included.
 */

#ifndef _BSPUART_H
#define _BSPUART_H

#include <bsp/irq.h>

#include <sys/ioctl.h>
#include <rtems/libio.h>

void BSP_uart_init(int uart, int baud, int hwFlow);
void BSP_uart_set_baud(int uart, int baud);
void BSP_uart_intr_ctrl(int uart, int cmd);
void BSP_uart_throttle(int uart);
void BSP_uart_unthrottle(int uart);
int  BSP_uart_polled_status(int uart);
void BSP_uart_polled_write(int uart, int val);
int  BSP_uart_polled_read(int uart);
void BSP_uart_termios_set(int uart, void *ttyp);
int  BSP_uart_termios_write_com(int minor, const char *buf, int len);
void BSP_uart_termios_isr_com1();
void BSP_uart_termios_isr_com2();
void BSP_uart_dbgisr_com1(void);
void BSP_uart_dbgisr_com2(void);
int  BSP_uart_install_isr(int uart, rtems_irq_hdl handler);
int  BSP_uart_remove_isr(int uart, rtems_irq_hdl handler);
int  BSP_uart_termios_write_polled(int minor, const char *buf, int len);
int  BSP_uart_get_break_cb(int uart, rtems_libio_ioctl_args_t *arg);
int  BSP_uart_set_break_cb(int uart, rtems_libio_ioctl_args_t *arg);

extern unsigned BSP_poll_char_via_serial(void);
extern void BSP_output_char_via_serial(const char val);
extern int BSPConsolePort;
extern int BSPBaseBaud;

/* Special IOCTLS to install a lowlevel 'BREAK' handler */

/* pass a BSP_UartBreakCb pointer to ioctl when retrieving
 * or installing break callback
 */
typedef void (*BSP_UartBreakCbProc)(int			uartMinor,
									unsigned	uartRBRLSRStatus,
									void		*termiosPrivatePtr,
									void		*private);

typedef struct BSP_UartBreakCbRec_ {
		BSP_UartBreakCbProc		handler;	/* NOTE NOTE this handler runs in INTERRUPT CONTEXT */
		void					*private;	/* closure pointer which is passed to the callback  */
} BSP_UartBreakCbRec, *BSP_UartBreakCb;

#define BIOCGETBREAKCB	_IOR('b',1,sizeof(BSP_UartBreakCbRec))
#define BIOCSETBREAKCB	_IOW('b',2,sizeof(BSP_UartBreakCbRec))

/*
 * Command values for BSP_uart_intr_ctrl(),
 * values are strange in order to catch errors 
 * with assert
 */
#define BSP_UART_INTR_CTRL_DISABLE  (0)
#define BSP_UART_INTR_CTRL_GDB      (0xaa) /* RX only */
#define BSP_UART_INTR_CTRL_ENABLE   (0xbb) /* Normal operations */
#define BSP_UART_INTR_CTRL_TERMIOS  (0xcc) /* RX & line status */

/* Return values for uart_polled_status() */
#define BSP_UART_STATUS_ERROR    (-1) /* No character */
#define BSP_UART_STATUS_NOCHAR   (0)  /* No character */
#define BSP_UART_STATUS_CHAR     (1)  /* Character present */
#define BSP_UART_STATUS_BREAK    (2)  /* Break point is detected */

/* PC UART definitions */
#define BSP_UART_COM1            (0)
#define BSP_UART_COM2            (1)

/*
 * Offsets from base
 */

/* DLAB 0 */
#define RBR  (0)    /* Rx Buffer Register (read) */
#define THR  (0)    /* Tx Buffer Register (write) */
#define IER  (1)    /* Interrupt Enable Register */

/* DLAB X */
#define IIR  (2)    /* Interrupt Ident Register (read) */
#define FCR  (2)    /* FIFO Control Register (write) */
#define LCR  (3)    /* Line Control Register */
#define MCR  (4)    /* Modem Control Register */
#define LSR  (5)    /* Line Status Register */
#define MSR  (6)    /* Modem Status  Register */
#define SCR  (7)    /* Scratch register */

/* DLAB 1 */
#define DLL  (0)    /* Divisor Latch, LSB */
#define DLM  (1)    /* Divisor Latch, MSB */
#define AFR  (2)    /* Alternate Function register */

/*
 * Interrupt source definition via IIR
 */
#define MODEM_STATUS				0
#define NO_MORE_INTR				1
#define TRANSMITTER_HODING_REGISTER_EMPTY	2
#define RECEIVER_DATA_AVAIL			4
#define RECEIVER_ERROR  			6
#define CHARACTER_TIMEOUT_INDICATION		12

/*
 * Bits definition of IER
 */
#define	RECEIVE_ENABLE		0x1
#define	TRANSMIT_ENABLE		0x2
#define RECEIVER_LINE_ST_ENABLE	0x4
#define MODEM_ENABLE	   	0x8
#define INTERRUPT_DISABLE	0x0

/*
 * Bits definition of the Line Status Register (LSR)
 */
#define DR	0x01	/* Data Ready */
#define OE	0x02	/* Overrun Error */
#define PE	0x04	/* Parity Error */
#define FE	0x08	/* Framing Error */
#define BI	0x10	/* Break Interrupt */
#define THRE	0x20	/* Transmitter Holding Register Empty */
#define TEMT	0x40	/* Transmitter Empty */
#define ERFIFO	0x80	/* Error receive Fifo */

/*
 * Bits definition of the MODEM Control Register (MCR)
 */
#define DTR	0x01	/* Data Terminal Ready */
#define RTS 	0x02	/* Request To Send */
#define OUT_1	0x04	/* Output 1, (reserved on COMPAQ I/O Board) */
#define OUT_2	0x08	/* Output 2, Enable Asynchronous Port Interrupts */
#define LB	0x10	/* Enable Internal Loop Back */

/*
 * Bits definition of the Line Control Register (LCR)
 */
#define CHR_5_BITS 0
#define CHR_6_BITS 1
#define CHR_7_BITS 2
#define CHR_8_BITS 3

#define WL	0x03	/* Word length mask */
#define STB	0x04	/* 1 Stop Bit, otherwise 2 Stop Bits */
#define PEN	0x08	/* Parity Enabled */
#define EPS	0x10	/* Even Parity Select, otherwise Odd */
#define SP	0x20	/* Stick Parity */
#define BCB	0x40	/* Break Control Bit */
#define DLAB	0x80	/* Enable Divisor Latch Access */

/*
 * Bits definition of the MODEM Status Register (MSR)
 */
#define DCTS	0x01	/* Delta Clear To Send */
#define DDSR	0x02	/* Delta Data Set Ready */
#define TERI	0x04 	/* Trailing Edge Ring Indicator */
#define DDCD	0x08	/* Delta Carrier Detect Indicator */
#define CTS  	0x10 	/* Clear To Send (when loop back is active) */
#define DSR	0x20	/* Data Set Ready (when loop back is active) */
#define RI  	0x40 	/* Ring Indicator (when loop back is active) */
#define DCD	0x80	/* Data Carrier Detect (when loop back is active) */

/*
 * Bits definition of the FIFO Control Register : WD16C552 or NS16550
 */

#define FIFO_CTRL   0x01    /* Set to 1 permit access to other bits */
#define FIFO_EN	    0x01    /* Enable the FIFO */
#define XMIT_RESET  0x02    /* Transmit FIFO Reset */
#define RCV_RESET   0x04    /* Receive FIFO Reset */
#define FCR3	    0x08    /* do not understand manual! */

#define RECEIVE_FIFO_TRIGGER1	0x0  /* trigger recieve interrupt after 1 byte  */
#define RECEIVE_FIFO_TRIGGER4	0x40 /* trigger recieve interrupt after 4 byte  */
#define RECEIVE_FIFO_TRIGGER8	0x80 /* trigger recieve interrupt after 8 byte  */
#define RECEIVE_FIFO_TRIGGER12	0xc0 /* trigger recieve interrupt after 12 byte */
#define TRIG_LEVEL  		0xc0 /* Mask for the trigger level 		*/

#endif /* _BSPUART_H */