diff options
Diffstat (limited to 'cpu/mcf52x2/serial.c')
| -rw-r--r-- | cpu/mcf52x2/serial.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/cpu/mcf52x2/serial.c b/cpu/mcf52x2/serial.c new file mode 100644 index 0000000..fbbd14d --- /dev/null +++ b/cpu/mcf52x2/serial.c @@ -0,0 +1,159 @@ +/* + * (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(); +} |