ns16550.c File Reference

#include <stdlib.h>
#include <rtems.h>
#include <rtems/libio.h>
#include <rtems/ringbuf.h>
#include <rtems/bspIo.h>
#include <rtems/termiostypes.h>
#include <libchip/serial.h>
#include <libchip/sersupp.h>
#include <bsp.h>
#include <libchip/ns16550_p.h>
#include <libchip/ns16550.h>

Data Structures
struct	NS16550Context

Functions
NS16550_STATIC void	ns16550_init (int minor)
NS16550_STATIC int	ns16550_open (int major, int minor, void *arg)
NS16550_STATIC int	ns16550_close (int major, int minor, void *arg)
NS16550_STATIC void	ns16550_write_polled (int minor, char cChar)
NS16550_STATIC int	ns16550_assert_RTS (int minor)
NS16550_STATIC int	ns16550_negate_RTS (int minor)
NS16550_STATIC int	ns16550_assert_DTR (int minor)
NS16550_STATIC int	ns16550_negate_DTR (int minor)
NS16550_STATIC void	ns16550_initialize_interrupts (int minor)
NS16550_STATIC void	ns16550_cleanup_interrupts (int minor)
NS16550_STATIC ssize_t	ns16550_write_support_int (int minor, const char *buf, size_t len)
	Transmits up to len characters from buf.
NS16550_STATIC ssize_t	ns16550_write_support_polled (int minor, const char *buf, size_t len)
int	ns16550_inbyte_nonblocking_polled (int minor)
NS16550_STATIC void	ns16550_enable_interrupts (console_tbl *c, int mask)
NS16550_STATIC int	ns16550_set_attributes (int minor, const struct termios *t)
void	ns16550_outch_polled (console_tbl *c, char out)
	Polled write for NS16550.
int	ns16550_inch_polled (console_tbl *c)

Variables
const console_flow	ns16550_flow_RTSCTS
const console_flow	ns16550_flow_DTRCTS
const console_fns	ns16550_fns
const console_fns	ns16550_fns_polled

Detailed Description

This file contains the TTY driver for the National Semiconductor NS16550.

This part is widely cloned and second sourced. It is found in a number of "Super IO" controllers.

This driver uses the termios pseudo driver.

Function Documentation

ns16550_write_support_int()

ssize_t ns16550_write_support_int	(	int	minor,
		const char *	buf,
		size_t	len )

Transmits up to len characters from buf.

This routine is invoked either from task context with disabled interrupts to start a new transmission process with exactly one character in case of an idle output state or from the interrupt handler to refill the transmitter.

Returns always zero.

Variable Documentation

ns16550_flow_DTRCTS

const console_flow ns16550_flow_DTRCTS

Initial value:

                                       = {
  ns16550_negate_DTR,             
  ns16550_assert_DTR              
}

ns16550_flow_RTSCTS

const console_flow ns16550_flow_RTSCTS

Initial value:

                                       = {
  ns16550_negate_RTS,             
  ns16550_assert_RTS              
}

ns16550_fns

const console_fns ns16550_fns

Initial value:

                              = {
  libchip_serial_default_probe,   
  ns16550_open,                   
  ns16550_close,                  
  NULL,                           
  ns16550_write_support_int,      
  ns16550_init,                   
  ns16550_write_polled,           
  ns16550_set_attributes,         
  true                            
}

ns16550_fns_polled

const console_fns ns16550_fns_polled

Initial value:

                                     = {
  libchip_serial_default_probe,        
  ns16550_open,                        
  ns16550_close,                       
  ns16550_inbyte_nonblocking_polled,   
  ns16550_write_support_polled,        
  ns16550_init,                        
  ns16550_write_polled,                
  ns16550_set_attributes,              
  false                                
}