/* * (C) Copyright 2000-2004 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <common.h> #include <command.h> #include <asm/mcfuart.h> #ifdef CONFIG_M5272 #include <asm/m5272.h> #endif #ifdef CONFIG_M5282 #include <asm/m5282.h> #endif #define DoubleClock(a) ((double)(CFG_CLK) / 32.0 / (double)(a)) void rs_serial_setbaudrate(int port,int baudrate) { #ifdef CONFIG_M5272 volatile unsigned char *uartp; double clock, fraction; if (port == 0) uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1); else uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE2); clock = DoubleClock(baudrate); /* Set baud above */ fraction = ((clock - (int)clock) * 16.0) + 0.5; uartp[MCFUART_UBG1] = (((int)clock >> 8) & 0xff); /* set msb baud */ uartp[MCFUART_UBG2] = ((int)clock & 0xff); /* set lsb baud */ uartp[MCFUART_UFPD] = ((int)fraction & 0xf); /* set baud fraction adjust */ #endif }; void rs_serial_init(int port,int baudrate) { volatile unsigned char *uartp; /* * Reset UART, get it into known state... */ if (port == 0) uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1); else uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE2); uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR; /* reset Error pointer */ /* * Set port for CONSOLE_BAUD_RATE, 8 data bits, 1 stop bit, no parity. */ uartp[MCFUART_UMR] = MCFUART_MR1_PARITYNONE | MCFUART_MR1_CS8; uartp[MCFUART_UMR] = MCFUART_MR2_STOP1; rs_serial_setbaudrate(port,baudrate); uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER; uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE; return; } /****************************************************************************/ /* * Output a single character, using UART polled mode. * This is used for console output. */ void rs_put_char(char ch) { volatile unsigned char *uartp; int i; uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1); for (i = 0; (i < 0x10000); i++) { if (uartp[MCFUART_USR] & MCFUART_USR_TXREADY) break; } uartp[MCFUART_UTB] = ch; return; } int rs_is_char(void) { volatile unsigned char *uartp; uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1); return((uartp[MCFUART_USR] & MCFUART_USR_RXREADY) ? 1 : 0); } int rs_get_char(void) { volatile unsigned char *uartp; uartp = (volatile unsigned char *) (CFG_MBAR + MCFUART_BASE1); return(uartp[MCFUART_URB]); } void serial_setbrg(void) { DECLARE_GLOBAL_DATA_PTR; rs_serial_setbaudrate(0,gd->bd->bi_baudrate); } int serial_init(void) { DECLARE_GLOBAL_DATA_PTR; rs_serial_init(0,gd->baudrate); return 0; } void serial_putc(const char c) { if (c == '\n') serial_putc ('\r'); rs_put_char(c); } void serial_puts (const char *s) { while (*s) { serial_putc(*s++); } } int serial_getc(void) { while(!rs_is_char()); return rs_get_char(); } int serial_tstc() { return rs_is_char(); }