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Diffstat (limited to 'board/alaska/extserial.c')
| -rw-r--r-- | board/alaska/extserial.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/board/alaska/extserial.c b/board/alaska/extserial.c new file mode 100644 index 0000000..f17e06e --- /dev/null +++ b/board/alaska/extserial.c @@ -0,0 +1,110 @@ +/* + * (C) Copyright 2004, Freescale, Inc + * TsiChung Liew, Tsi-Chung.Liew@freescale.com. + * + * 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 + * + */ + +/* + * Minimal serial functions needed to use one of the PSC ports + * as serial console interface. + */ + +#include <common.h> +#include <mpc8220.h> + +#if defined (CONFIG_EXTUART_CONSOLE) +# include <ns16550.h> + +# define PADSERIAL_BAUD_115200 0x40 +# define PADSERIAL_BAUD_57600 0x20 +# define PADSERIAL_BAUD_9600 0 +# define PADCARD_FREQ 18432000 + +const NS16550_t com_port = (NS16550_t) CFG_NS16550_COM1; + +int ext_serial_init (void) +{ + DECLARE_GLOBAL_DATA_PTR; + volatile u8 *dipswitch = (volatile u8 *) (CFG_CPLD_BASE + 0x1002); + int baud_divisor; + + /* Find out the baud rate speed on debug card dip switches */ + if (*dipswitch & PADSERIAL_BAUD_115200) + gd->baudrate = 115200; + else if (*dipswitch & PADSERIAL_BAUD_57600) + gd->baudrate = 57600; + else + gd->baudrate = 9600; + + /* Debug card frequency */ + baud_divisor = PADCARD_FREQ / (16 * gd->baudrate); + + NS16550_init (com_port, baud_divisor); + + return (0); +} + +void ext_serial_putc (const char c) +{ + if (c == '\n') + NS16550_putc (com_port, '\r'); + + NS16550_putc (com_port, c); +} + +void ext_serial_puts (const char *s) +{ + while (*s) { + serial_putc (*s++); + } +} + +int ext_serial_getc (void) +{ + return NS16550_getc (com_port); +} + +int ext_serial_tstc (void) +{ + return NS16550_tstc (com_port); +} + +void ext_serial_setbrg (void) +{ + DECLARE_GLOBAL_DATA_PTR; + + volatile u8 *dipswitch = (volatile u8 *) (CFG_CPLD_BASE + 0x1002); + int baud_divisor; + + /* Find out the baud rate speed on debug card dip switches */ + if (*dipswitch & PADSERIAL_BAUD_115200) + gd->baudrate = 115200; + else if (*dipswitch & PADSERIAL_BAUD_57600) + gd->baudrate = 57600; + else + gd->baudrate = 9600; + + /* Debug card frequency */ + baud_divisor = PADCARD_FREQ / (16 * gd->baudrate); + + NS16550_reinit (com_port, baud_divisor); +} +#endif /* CONFIG_EXTUART_CONSOLE */ |