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https://github.com/brain-hackers/u-boot-brain
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b207d6455b
Implement support for CONFIG_SERIAL_MULTI into altera serial driver. This driver was so far only usable directly, but this patch also adds support for the multi method. This allows using more than one serial driver alongside the altera driver. Also, add a weak implementation of default_serial_console() returning this driver. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Marek Vasut <marek.vasut@gmail.com> Cc: Tom Rini <trini@ti.com> Cc: Scott McNutt <smcnutt@psyent.com>
156 lines
3.2 KiB
C
156 lines
3.2 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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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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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 void altera_serial_puts(const char *s)
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{
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while (*s != 0) {
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serial_putc (*s++);
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}
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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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#ifdef CONFIG_SERIAL_MULTI
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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 = altera_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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#else
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int serial_init(void)
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{
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return altera_serial_init();
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}
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void serial_setbrg(void)
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{
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altera_serial_setbrg();
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}
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void serial_putc(const char c)
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{
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altera_serial_putc(c);
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}
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void serial_puts(const char *s)
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{
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altera_serial_puts(s);
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}
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int serial_getc(void)
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{
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return altera_serial_getc();
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}
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int serial_tstc(void)
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{
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return altera_serial_tstc();
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}
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#endif
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