101 lines
2.0 KiB
C
101 lines
2.0 KiB
C
/*
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* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
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* Scott McNutt <smcnutt@psyent.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <asm/io.h>
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#include <nios2-io.h>
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#include <linux/compiler.h>
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#include <serial.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*------------------------------------------------------------------
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* UART the serial port
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*-----------------------------------------------------------------*/
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static nios_uart_t *uart = (nios_uart_t *) CONFIG_SYS_NIOS_CONSOLE;
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#if defined(CONFIG_SYS_NIOS_FIXEDBAUD)
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/*
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* Everything's already setup for fixed-baud PTF
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* assignment
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*/
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static void altera_serial_setbrg(void)
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{
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}
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static int altera_serial_init(void)
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{
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return 0;
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}
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#else
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static void altera_serial_setbrg(void)
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{
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unsigned div;
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div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
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writel (div, &uart->divisor);
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}
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static int altera_serial_init(void)
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{
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serial_setbrg();
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return 0;
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}
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#endif /* CONFIG_SYS_NIOS_FIXEDBAUD */
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/*-----------------------------------------------------------------------
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* UART CONSOLE
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*---------------------------------------------------------------------*/
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static void altera_serial_putc(char c)
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{
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if (c == '\n')
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serial_putc ('\r');
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while ((readl (&uart->status) & NIOS_UART_TRDY) == 0)
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WATCHDOG_RESET ();
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writel ((unsigned char)c, &uart->txdata);
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}
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static int altera_serial_tstc(void)
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{
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return (readl (&uart->status) & NIOS_UART_RRDY);
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}
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static int altera_serial_getc(void)
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{
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while (serial_tstc () == 0)
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WATCHDOG_RESET ();
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return (readl (&uart->rxdata) & 0x00ff );
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}
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static struct serial_device altera_serial_drv = {
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.name = "altera_serial",
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.start = altera_serial_init,
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.stop = NULL,
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.setbrg = altera_serial_setbrg,
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.putc = altera_serial_putc,
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.puts = default_serial_puts,
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.getc = altera_serial_getc,
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.tstc = altera_serial_tstc,
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};
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void altera_serial_initialize(void)
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{
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serial_register(&altera_serial_drv);
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}
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__weak struct serial_device *default_serial_console(void)
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{
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return &altera_serial_drv;
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}
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