mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 07:34:31 +00:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
100 lines
2 KiB
C
100 lines
2 KiB
C
/*
|
|
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
|
|
* Scott McNutt <smcnutt@psyent.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
|
|
#include <common.h>
|
|
#include <watchdog.h>
|
|
#include <asm/io.h>
|
|
#include <nios2-io.h>
|
|
#include <linux/compiler.h>
|
|
#include <serial.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/*------------------------------------------------------------------
|
|
* UART the serial port
|
|
*-----------------------------------------------------------------*/
|
|
|
|
static nios_uart_t *uart = (nios_uart_t *) CONFIG_SYS_NIOS_CONSOLE;
|
|
|
|
#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
|
|
|
|
/*
|
|
* Everything's already setup for fixed-baud PTF
|
|
* assignment
|
|
*/
|
|
static void altera_serial_setbrg(void)
|
|
{
|
|
}
|
|
|
|
static int altera_serial_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
|
|
static void altera_serial_setbrg(void)
|
|
{
|
|
unsigned div;
|
|
|
|
div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
|
|
writel (div, &uart->divisor);
|
|
}
|
|
|
|
static int altera_serial_init(void)
|
|
{
|
|
serial_setbrg();
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* UART CONSOLE
|
|
*---------------------------------------------------------------------*/
|
|
static void altera_serial_putc(char c)
|
|
{
|
|
if (c == '\n')
|
|
serial_putc ('\r');
|
|
while ((readl (&uart->status) & NIOS_UART_TRDY) == 0)
|
|
WATCHDOG_RESET ();
|
|
writel ((unsigned char)c, &uart->txdata);
|
|
}
|
|
|
|
static int altera_serial_tstc(void)
|
|
{
|
|
return (readl (&uart->status) & NIOS_UART_RRDY);
|
|
}
|
|
|
|
static int altera_serial_getc(void)
|
|
{
|
|
while (serial_tstc () == 0)
|
|
WATCHDOG_RESET ();
|
|
return (readl (&uart->rxdata) & 0x00ff );
|
|
}
|
|
|
|
static struct serial_device altera_serial_drv = {
|
|
.name = "altera_serial",
|
|
.start = altera_serial_init,
|
|
.stop = NULL,
|
|
.setbrg = altera_serial_setbrg,
|
|
.putc = altera_serial_putc,
|
|
.puts = default_serial_puts,
|
|
.getc = altera_serial_getc,
|
|
.tstc = altera_serial_tstc,
|
|
};
|
|
|
|
void altera_serial_initialize(void)
|
|
{
|
|
serial_register(&altera_serial_drv);
|
|
}
|
|
|
|
__weak struct serial_device *default_serial_console(void)
|
|
{
|
|
return &altera_serial_drv;
|
|
}
|