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/*
* (C) Copyright 2007
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* Author: Igor Lisitsin <igor@emcraft.com>
*
* Copyright 2010, Stefan Roese, DENX Software Engineering, sr@denx.de
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/ppc4xx.h>
#include <ns16550.h>
#include <asm/io.h>
#include <serial.h>
/*
* UART test
*
* The controllers are configured to loopback mode and several
* characters are transmitted.
*/
#include <post.h>
#if CONFIG_POST & CONFIG_SYS_POST_UART
/*
* This table defines the UART's that should be tested and can
* be overridden in the board config file
*/
#ifndef CONFIG_SYS_POST_UART_TABLE
#define CONFIG_SYS_POST_UART_TABLE { CONFIG_SYS_NS16550_COM1, \
CONFIG_SYS_NS16550_COM2, CONFIG_SYS_NS16550_COM3, \
CONFIG_SYS_NS16550_COM4 }
#endif
DECLARE_GLOBAL_DATA_PTR;
static int test_ctlr (struct NS16550 *com_port, int index)
{
int res = -1;
char test_str[] = "*** UART Test String ***\r\n";
int i;
int divisor;
divisor = (get_serial_clock() + (gd->baudrate * (16 / 2))) /
(16 * gd->baudrate);
NS16550_init(com_port, divisor);
/*
* Set internal loopback mode in UART
*/
out_8(&com_port->mcr, in_8(&com_port->mcr) | UART_MCR_LOOP);
/* Reset FIFOs */
out_8(&com_port->fcr, UART_FCR_RXSR | UART_FCR_TXSR);
udelay(100);
/* Flush RX-FIFO */
while (NS16550_tstc(com_port))
NS16550_getc(com_port);
for (i = 0; i < sizeof (test_str) - 1; i++) {
NS16550_putc(com_port, test_str[i]);
if (NS16550_getc(com_port) != test_str[i])
goto done;
}
res = 0;
done:
if (res)
post_log ("uart%d test failed\n", index);
return res;
}
int uart_post_test (int flags)
{
int i, res = 0;
static unsigned long base[] = CONFIG_SYS_POST_UART_TABLE;
for (i = 0; i < ARRAY_SIZE(base); i++) {
if (test_ctlr((struct NS16550 *)base[i], i))
res = -1;
}
serial_reinit_all ();
return res;
}
#endif /* CONFIG_POST & CONFIG_SYS_POST_UART */
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