/*
* console driver for S3C2400 UARTs
*
* This driver uses the shared console driver in
* ...../libbsp/shared/console.c
*
* If you want the driver to be interrupt driven, you
* need to write the ISR, and in the ISR insert the
* chars into termios's queue.
*
* Copyright (c) 2004 Cogent Computer Systems
* Written by Jay Monkman <jtm@lopingdog.com>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <bsp.h> /* Must be before libio.h */
#include <rtems/libio.h>
#include <termios.h>
#include <rtems/bspIo.h>
/* Put the CPU (or UART) specific header file #include here */
#include <s3c24xx.h>
#include <libchip/serial.h>
#include <libchip/sersupp.h>
/* How many serial ports? */
#define NUM_DEVS 1
int uart_poll_read(int minor);
int dbg_dly;
/* static function prototypes */
static int uart_first_open(int major, int minor, void *arg);
static int uart_last_close(int major, int minor, void *arg);
static int uart_read(int minor);
static ssize_t uart_write(int minor, const char *buf, size_t len);
static void uart_init(int minor);
static void uart_write_polled(int minor, char c);
static int uart_set_attributes(int minor, const struct termios *t);
/* These are used by code in console.c */
unsigned long Console_Configuration_Count = NUM_DEVS;
/* Pointers to functions for handling the UART. */
const console_fns uart_fns =
{
libchip_serial_default_probe,
uart_first_open,
uart_last_close,
uart_read,
uart_write,
uart_init,
uart_write_polled, /* not used in this driver */
uart_set_attributes,
FALSE /* TRUE if interrupt driven, FALSE if not. */
};
/*
* There's one item in array for each UART.
*
* Some of these fields are marked "NOT USED". They are not used
* by console.c, but may be used by drivers in libchip
*
*/
console_tbl Console_Configuration_Ports[] = {
{
"/dev/com0", /* sDeviceName */
SERIAL_CUSTOM, /* deviceType */
&uart_fns, /* pDeviceFns */
NULL, /* deviceProbe */
NULL, /* pDeviceFlow */
0, /* ulMargin - NOT USED */
0, /* ulHysteresis - NOT USED */
NULL, /* pDeviceParams */
0, /* ulCtrlPort1 - NOT USED */
0, /* ulCtrlPort2 - NOT USED */
0, /* ulDataPort - NOT USED */
NULL, /* getRegister - NOT USED */
NULL, /* setRegister - NOT USED */
NULL, /* getData - NOT USED */
NULL, /* setData - NOT USED */
0, /* ulClock - NOT USED */
0 /* ulIntVector - NOT USED */
}
};
/*********************************************************************/
/* Functions called via termios callbacks (i.e. the ones in uart_fns */
/*********************************************************************/
/*
* This is called the first time each device is opened. If the driver
* is interrupt driven, you should enable interrupts here. Otherwise,
* it's probably safe to do nothing.
*
* Since micromonitor already set up the UART, we do nothing.
*/
static int uart_first_open(int major, int minor, void *arg)
{
return 0;
}
/*
* This is called the last time each device is closed. If the driver
* is interrupt driven, you should disable interrupts here. Otherwise,
* it's probably safe to do nothing.
*/
static int uart_last_close(int major, int minor, void *arg)
{
return 0;
}
/*
* Read one character from UART.
*
* Return -1 if there's no data, otherwise return
* the character in lowest 8 bits of returned int.
*/
static int uart_read(int minor)
{
char c;
if (minor == 0) {
if (rUTRSTAT0 & 0x1) {
c = rURXH0 & 0xff;
return c;
} else {
return -1;
}
} else {
printk("Unknown console minor number: %d\n", minor);
return -1;
}
}
/*
* Write buffer to UART
*
* return 1 on success, -1 on error
*/
static ssize_t uart_write(int minor, const char *buf, size_t len)
{
int i;
if (minor == 0) {
for (i = 0; i < len; i++) {
/* Wait for fifo to have room */
while(!(rUTRSTAT0 & 0x2)) {
continue;
}
rUTXH0 = (char) buf[i];
}
} else {
printk("Unknown console minor number: %d\n", minor);
return -1;
}
return 1;
}
/* Set up the UART. */
static void uart_init(int minor)
{
int i;
unsigned int reg = 0;
/* enable UART0 */
rCLKCON|=0x100;
/* value is calculated so : (int)(PCLK/16./baudrate) -1 */
reg = get_PCLK() / (16 * 115200) - 1;
/* FIFO enable, Tx/Rx FIFO clear */
rUFCON0 = 0x07;
rUMCON0 = 0x0;
/* Normal,No parity,1 stop,8 bit */
rULCON0 = 0x3;
/*
* tx=level,rx=edge,disable timeout int.,enable rx error int.,
* normal,interrupt or polling
*/
rUCON0 = 0x245;
rUBRDIV0 = reg;
for (i = 0; i < 100; i++);
}
/* I'm not sure this is needed for the shared console driver. */
static void uart_write_polled(int minor, char c)
{
uart_write(minor, &c, 1);
}
/* This is for setting baud rate, bits, etc. */
static int uart_set_attributes(int minor, const struct termios *t)
{
return 0;
}
/***********************************************************************/
/*
* The following functions are not used by TERMIOS, but other RTEMS
* functions use them instead.
*/
/***********************************************************************/
/*
* Read from UART. This is used in the exit code, and can't
* rely on interrupts.
*/
int uart_poll_read(int minor)
{
return uart_read(minor);
}
/*
* Write a character to the console. This is used by printk() and
* maybe other low level functions. It should not use interrupts or any
* RTEMS system calls. It needs to be very simple
*/
static void _BSP_put_char( char c ) {
uart_write_polled(0, c);
if (c == '\n') {
uart_write_polled(0, '\r');
}
}
BSP_output_char_function_type BSP_output_char = _BSP_put_char;
static int _BSP_get_char(void)
{
return uart_poll_read(0);
}
BSP_polling_getchar_function_type BSP_poll_char = _BSP_get_char;
