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b6cd0fef93
Implement support for CONFIG_SERIAL_MULTI into ixp 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 ixp 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: Michael Schwingen <michael@schwingen.org>
183 lines
4.0 KiB
C
183 lines
4.0 KiB
C
/*
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* (C) Copyright 2002
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* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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*
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* Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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, MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <asm/arch/ixp425.h>
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#include <watchdog.h>
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#include <serial.h>
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#include <linux/compiler.h>
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/*
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* 14.7456 MHz
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* Baud Rate = --------------
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* 16 x Divisor
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*/
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#define SERIAL_CLOCK 921600
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DECLARE_GLOBAL_DATA_PTR;
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static void ixp_serial_setbrg(void)
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{
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unsigned int quot = 0;
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int uart = CONFIG_SYS_IXP425_CONSOLE;
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if ((gd->baudrate <= SERIAL_CLOCK) && (SERIAL_CLOCK % gd->baudrate == 0))
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quot = SERIAL_CLOCK / gd->baudrate;
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else
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hang ();
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IER(uart) = 0; /* Disable for now */
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FCR(uart) = 0; /* No fifos enabled */
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/* set baud rate */
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LCR(uart) = LCR_WLS0 | LCR_WLS1 | LCR_DLAB;
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DLL(uart) = quot & 0xff;
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DLH(uart) = quot >> 8;
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LCR(uart) = LCR_WLS0 | LCR_WLS1;
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#ifdef CONFIG_SERIAL_RTS_ACTIVE
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MCR(uart) = MCR_RTS; /* set RTS active */
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#else
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MCR(uart) = 0; /* set RTS inactive */
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#endif
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IER(uart) = IER_UUE;
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}
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/*
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* Initialise the serial port with the given baudrate. The settings
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* are always 8 data bits, no parity, 1 stop bit, no start bits.
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*
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*/
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static int ixp_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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/*
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* Output a single byte to the serial port.
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*/
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static void ixp_serial_putc(const char c)
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{
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/* wait for room in the tx FIFO on UART */
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while ((LSR(CONFIG_SYS_IXP425_CONSOLE) & LSR_TEMT) == 0)
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WATCHDOG_RESET(); /* Reset HW Watchdog, if needed */
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THR(CONFIG_SYS_IXP425_CONSOLE) = c;
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/* If \n, also do \r */
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if (c == '\n')
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serial_putc ('\r');
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}
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/*
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* Read a single byte from the serial port. Returns 1 on success, 0
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* otherwise. When the function is succesfull, the character read is
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* written into its argument c.
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*/
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static int ixp_serial_tstc(void)
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{
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return LSR(CONFIG_SYS_IXP425_CONSOLE) & LSR_DR;
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}
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/*
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* Read a single byte from the serial port. Returns 1 on success, 0
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* otherwise. When the function is succesfull, the character read is
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* written into its argument c.
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*/
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static int ixp_serial_getc(void)
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{
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while (!(LSR(CONFIG_SYS_IXP425_CONSOLE) & LSR_DR))
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WATCHDOG_RESET(); /* Reset HW Watchdog, if needed */
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return (char) RBR(CONFIG_SYS_IXP425_CONSOLE) & 0xff;
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}
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static void ixp_serial_puts(const char *s)
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{
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while (*s) {
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serial_putc (*s++);
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}
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}
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#ifdef CONFIG_SERIAL_MULTI
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static struct serial_device ixp_serial_drv = {
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.name = "ixp_serial",
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.start = ixp_serial_init,
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.stop = NULL,
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.setbrg = ixp_serial_setbrg,
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.putc = ixp_serial_putc,
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.puts = ixp_serial_puts,
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.getc = ixp_serial_getc,
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.tstc = ixp_serial_tstc,
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};
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void ixp_serial_initialize(void)
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{
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serial_register(&ixp_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 &ixp_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 ixp_serial_init();
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}
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void serial_setbrg(void)
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{
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ixp_serial_setbrg();
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}
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void serial_putc(const char c)
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{
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ixp_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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ixp_serial_puts(s);
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}
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int serial_getc(void)
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{
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return ixp_serial_getc();
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}
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int serial_tstc(void)
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{
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return ixp_serial_tstc();
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}
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#endif
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