131 lines
2.9 KiB
C
131 lines
2.9 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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* SPDX-License-Identifier: GPL-2.0+
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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 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 = default_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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