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/*
* Console driver for AT91RM9200 DBGU port
*
* This driver uses the shared console driver in
* ...../libbsp/shared/console.c
*
* Copyright (c) 2003 by Cogent Computer Systems
* Written by Mike Kelly <mike@cogcomp.com>
* and 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.com/license/LICENSE.
*/
#include <bsp.h>
#include <rtems/libio.h>
#include <termios.h>
#include <at91rm9200.h>
#include <at91rm9200_dbgu.h>
#include <at91rm9200_pmc.h>
#include <rtems/bspIo.h>
#include <libchip/serial.h>
#include <libchip/sersupp.h>
volatile int dbg_dly;
/* static function prototypes */
static int dbgu_first_open(int major, int minor, void *arg);
static int dbgu_last_close(int major, int minor, void *arg);
static int dbgu_read(int minor);
static ssize_t dbgu_write(int minor, const char *buf, size_t len);
static void dbgu_init(int minor);
static void dbgu_write_polled(int minor, char c);
static int dbgu_set_attributes(int minor, const struct termios *t);
/* Pointers to functions for handling the UART. */
const console_fns dbgu_fns =
{
libchip_serial_default_probe,
dbgu_first_open,
dbgu_last_close,
dbgu_read,
dbgu_write,
dbgu_init,
dbgu_write_polled, /* not used in this driver */
dbgu_set_attributes,
FALSE /* TRUE if interrupt driven, FALSE if not. */
};
/*********************************************************************/
/* Functions called via callbacks (i.e. the ones in uart_fns */
/*********************************************************************/
/*
* This is called the first time each device is opened. Since
* the driver is polled, we don't have to do anything. If the driver
* were interrupt driven, we'd enable interrupts here.
*/
static int dbgu_first_open(int major, int minor, void *arg)
{
return 0;
}
/*
* This is called the last time each device is closed. Since
* the driver is polled, we don't have to do anything. If the driver
* were interrupt driven, we'd disable interrupts here.
*/
static int dbgu_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 dbgu_read(int minor)
{
char c;
console_tbl *console_entry;
at91rm9200_dbgu_regs_t *dbgu;
console_entry = BSP_get_uart_from_minor(minor);
if (console_entry == NULL) {
return -1;
}
dbgu = (at91rm9200_dbgu_regs_t *)console_entry->ulCtrlPort1;
if (!(dbgu->sr & DBGU_INT_RXRDY)) {
return -1;
}
c = dbgu->rhr & 0xff;
return c;
}
/*
* Write buffer to UART
*
* return 1 on success, -1 on error
*/
static ssize_t dbgu_write(int minor, const char *buf, size_t len)
{
int i, x;
char c;
console_tbl *console_entry;
at91rm9200_dbgu_regs_t *dbgu;
console_entry = BSP_get_uart_from_minor(minor);
if (console_entry == NULL) {
return -1;
}
dbgu = (at91rm9200_dbgu_regs_t *)console_entry->ulCtrlPort1;
for (i = 0; i < len; i++) {
/* Wait for fifo to have room */
while(1) {
if (dbgu->sr & DBGU_INT_TXRDY) {
break;
}
}
c = (char) buf[i];
dbgu->thr = c;
/* the TXRDY flag does not seem to update right away (is this true?) */
/* so we wait a bit before continuing */
for (x = 0; x < 100; x++) {
dbg_dly++; /* using a global so this doesn't get optimized out */
}
}
return 1;
}
/* Set up the UART. */
static void dbgu_init(int minor)
{
console_tbl *console_entry;
at91rm9200_dbgu_regs_t *dbgu;
console_entry = BSP_get_uart_from_minor(minor);
if (console_entry == NULL) {
return;
}
dbgu = (at91rm9200_dbgu_regs_t *)console_entry->ulCtrlPort1;
/* Clear error bits, and reset */
dbgu->cr = (DBGU_CR_RSTSTA | DBGU_CR_RSTTX | DBGU_CR_RSTRX);
/* Clear pending interrupts */
dbgu->idr = DBGU_INT_ALL;
dbgu->imr = 0;
/* Set port to no parity, no loopback */
dbgu->mr = DBGU_MR_PAR_NONE | DBGU_MR_CHMODE_NORM;
/* Set the baud rate */
dbgu->brgr = (at91rm9200_get_mck() / 16) / BSP_get_baud();
/* Enable the DBGU */
dbgu->cr = (DBGU_CR_TXEN | DBGU_CR_RXEN);
}
/* This is used for getchark support */
static void dbgu_write_polled(int minor, char c)
{
dbgu_write(minor, &c, 1);
}
/* This is for setting baud rate, bits, etc. */
static int dbgu_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 dbgu_poll_read(int minor)
{
return dbgu_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 ) {
dbgu_write_polled(0, c);
if ( c == '\n' )
dbgu_write_polled(0, '\r');
}
BSP_output_char_function_type BSP_output_char = _BSP_put_char;
int _BSP_poll_char(void)
{
return dbgu_poll_read(0);
}
BSP_polling_getchar_function_type BSP_poll_char = _BSP_poll_char;
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