mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-10 06:43:28 +09:00
169 lines
3.9 KiB
C
169 lines
3.9 KiB
C
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/*
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* (C) Copyright 2000-2003
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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 <commproc.h>
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#include <command.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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#include <asm/mcfuart.h>
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#define DoubleClock(a) ((double)(MCF_CLK) / 32.0 / (double)(a))
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void rs_serial_setbaudrate (int port, int baudrate)
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{
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#ifdef CONFIG_M5272
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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 *) (MCF_MBAR + MCFUART_BASE1);
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else
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uartp = (volatile unsigned char *) (MCF_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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double clock, fraction;
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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 *) (MCF_MBAR + MCFUART_BASE1);
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else
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uartp = (volatile unsigned char *) (MCF_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] =
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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 *) (MCF_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 *) (MCF_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 *) (MCF_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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{
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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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{
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DECLARE_GLOBAL_DATA_PTR;
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rs_serial_init (0, gd->bd->bi_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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{
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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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{
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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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{
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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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{
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return rs_is_char ();
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}
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