217 lines
4.1 KiB
C
217 lines
4.1 KiB
C
pyright 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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* ght 2002-2004
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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/hardware.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* flush serial input queue. returns 0 on success or negative error
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* number otherwise
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*/
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static int serial_flush_input(void)
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{
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volatile u32 tmp;
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/* keep on reading as long as the receiver is not empty */
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while(UTRSTAT0&0x01) {
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tmp = REGB(URXH0);
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}
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return 0;
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}
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/* flush output queue. returns 0 on success or negative error number
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* otherwise
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*/
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static int serial_flush_output(void)
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{
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/* wait until the transmitter is no longer busy */
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while(!(UTRSTAT0 & 0x02)) {
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}
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return 0;
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}
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static void s3c44b0_serial_setbrg(void)
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{
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u32 divisor = 0;
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/* get correct divisor */
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switch(gd->baudrate) {
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case 1200:
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#if CONFIG_S3C44B0_CLOCK_SPEED==66
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divisor = 3124;
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#elif CONFIG_S3C44B0_CLOCK_SPEED==75
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divisor = 3905;
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#else
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# error CONFIG_S3C44B0_CLOCK_SPEED undefined
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#endif
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break;
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case 9600:
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#if CONFIG_S3C44B0_CLOCK_SPEED==66
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divisor = 390;
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#elif CONFIG_S3C44B0_CLOCK_SPEED==75
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divisor = 487;
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#else
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# error CONFIG_S3C44B0_CLOCK_SPEED undefined
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#endif
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break;
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case 19200:
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#if CONFIG_S3C44B0_CLOCK_SPEED==66
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divisor = 194;
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#elif CONFIG_S3C44B0_CLOCK_SPEED==75
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divisor = 243;
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#else
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# error CONFIG_S3C44B0_CLOCK_SPEED undefined
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#endif
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break;
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case 38400:
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#if CONFIG_S3C44B0_CLOCK_SPEED==66
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divisor = 97;
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#elif CONFIG_S3C44B0_CLOCK_SPEED==75
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divisor = 121;
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#else
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# error CONFIG_S3C44B0_CLOCK_SPEED undefined
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#endif /* break; */
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case 57600:
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#if CONFIG_S3C44B0_CLOCK_SPEED==66
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divisor = 64;
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#elif CONFIG_S3C44B0_CLOCK_SPEED==75
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divisor = 80;
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#else
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# error CONFIG_S3C44B0_CLOCK_SPEED undefined
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#endif /* break; */
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case 115200:
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#if CONFIG_S3C44B0_CLOCK_SPEED==66
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divisor = 32;
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#elif CONFIG_S3C44B0_CLOCK_SPEED==75
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divisor = 40;
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#else
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# error CONFIG_S3C44B0_CLOCK_SPEED undefined
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#endif /* break; */
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}
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serial_flush_output();
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serial_flush_input();
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UFCON0 = 0x0;
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ULCON0 = 0x03;
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UCON0 = 0x05;
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UBRDIV0 = divisor;
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UFCON1 = 0x0;
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ULCON1 = 0x03;
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UCON1 = 0x05;
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UBRDIV1 = divisor;
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for(divisor=0; divisor<100; divisor++) {
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/* NOP */
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}
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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 s3c44b0_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 s3c44b0_serial_putc(const char c)
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{
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/* wait for room in the transmit FIFO */
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while(!(UTRSTAT0 & 0x02));
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UTXH0 = (unsigned char)c;
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/*
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to be polite with serial console add a line feed
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to the carriage return character
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*/
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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 s3c44b0_serial_tstc(void)
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{
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return (UTRSTAT0 & 0x01);
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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 s3c44b0_serial_getc(void)
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{
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int rv;
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for(;;) {
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rv = s3c44b0_serial_tstc();
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if(rv > 0)
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return URXH0;
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}
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}
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static struct serial_device s3c44b0_serial_drv = {
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.name = "s3c44b0_serial",
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.start = s3c44b0_serial_init,
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.stop = NULL,
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.setbrg = s3c44b0_serial_setbrg,
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.putc = s3c44b0_serial_putc,
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.puts = default_serial_puts,
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.getc = s3c44b0_serial_getc,
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.tstc = s3c44b0_serial_tstc,
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};
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void s3c44b0_serial_initialize(void)
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{
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serial_register(&s3c44b0_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 &s3c44b0_serial_drv;
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}
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