mirror of
https://github.com/AsahiLinux/u-boot
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167 lines
4 KiB
C
167 lines
4 KiB
C
/*
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* (C) Copyright 2000-2004
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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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 <command.h>
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#include <asm/mcfuart.h>
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#ifdef CONFIG_M5272
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#include <asm/m5272.h>
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#endif
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#ifdef CONFIG_M5282
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#include <asm/m5282.h>
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#endif
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#ifdef CONFIG_M5249
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#include <asm/m5249.h>
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#endif
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#ifdef CONFIG_M5249
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#define DoubleClock(a) ((double)(CFG_CLK/2) / 32.0 / (double)(a))
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#else
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#define DoubleClock(a) ((double)(CFG_CLK) / 32.0 / (double)(a))
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#endif
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void rs_serial_setbaudrate(int port,int baudrate)
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{
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#if defined(CONFIG_M5272) || defined(CONFIG_M5249)
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volatile unsigned char *uartp;
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double clock, fraction;
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if (port == 0)
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uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1);
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else
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uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE2);
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clock = DoubleClock(baudrate); /* Set baud above */
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fraction = ((clock - (int)clock) * 16.0) + 0.5;
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uartp[MCFUART_UBG1] = (((int)clock >> 8) & 0xff); /* set msb baud */
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uartp[MCFUART_UBG2] = ((int)clock & 0xff); /* set lsb baud */
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uartp[MCFUART_UFPD] = ((int)fraction & 0xf); /* set baud fraction adjust */
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#endif
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};
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void rs_serial_init(int port,int baudrate)
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{
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volatile unsigned char *uartp;
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/*
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* Reset UART, get it into known state...
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*/
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if (port == 0)
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uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1);
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else
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uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE2);
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uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
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uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
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uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */
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uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR; /* reset Error pointer */
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/*
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* Set port for CONSOLE_BAUD_RATE, 8 data bits, 1 stop bit, no parity.
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*/
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uartp[MCFUART_UMR] = MCFUART_MR1_PARITYNONE | MCFUART_MR1_CS8;
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uartp[MCFUART_UMR] = MCFUART_MR2_STOP1;
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rs_serial_setbaudrate(port,baudrate);
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uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
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uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
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return;
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}
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/****************************************************************************/
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/*
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* Output a single character, using UART polled mode.
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* This is used for console output.
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*/
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void rs_put_char(char ch)
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{
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volatile unsigned char *uartp;
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int i;
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uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1);
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for (i = 0; (i < 0x10000); i++) {
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if (uartp[MCFUART_USR] & MCFUART_USR_TXREADY)
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break;
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}
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uartp[MCFUART_UTB] = ch;
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return;
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}
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int rs_is_char(void)
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{
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volatile unsigned char *uartp;
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uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1);
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return((uartp[MCFUART_USR] & MCFUART_USR_RXREADY) ? 1 : 0);
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}
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int rs_get_char(void)
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{
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volatile unsigned char *uartp;
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uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1);
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return(uartp[MCFUART_URB]);
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}
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void serial_setbrg(void) {
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DECLARE_GLOBAL_DATA_PTR;
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rs_serial_setbaudrate(0,gd->bd->bi_baudrate);
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}
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int serial_init(void) {
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DECLARE_GLOBAL_DATA_PTR;
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rs_serial_init(0,gd->baudrate);
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return 0;
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}
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void serial_putc(const char c) {
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if (c == '\n')
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serial_putc ('\r');
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rs_put_char(c);
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}
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void serial_puts (const char *s) {
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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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int serial_getc(void) {
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while(!rs_is_char());
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return rs_get_char();
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}
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int serial_tstc() {
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return rs_is_char();
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}
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