diff options
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/Makefile | 1 | ||||
| -rw-r--r-- | drivers/serial/serial_ixp.c | 125 |
2 files changed, 126 insertions, 0 deletions
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index c7a1882ef8..b6fd0d7746 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -32,6 +32,7 @@ COBJS-y += ns16550.o COBJS-$(CONFIG_DRIVER_S3C4510_UART) += s3c4510b_uart.o COBJS-$(CONFIG_S3C64XX) += s3c64xx.o COBJS-y += serial.o +COBJS-$(CONFIG_IXP_SERIAL) += serial_ixp.o COBJS-$(CONFIG_MAX3100_SERIAL) += serial_max3100.o COBJS-$(CONFIG_PL010_SERIAL) += serial_pl01x.o COBJS-$(CONFIG_PL011_SERIAL) += serial_pl01x.o diff --git a/drivers/serial/serial_ixp.c b/drivers/serial/serial_ixp.c new file mode 100644 index 0000000000..dd26af49b5 --- /dev/null +++ b/drivers/serial/serial_ixp.c @@ -0,0 +1,125 @@ +/* + * (C) Copyright 2002 + * Wolfgang Denk, DENX Software Engineering, <wd@denx.de> + * + * (C) Copyright 2002 + * Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Marius Groeger <mgroeger@sysgo.de> + * + * (C) Copyright 2002 + * Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Alex Zuepke <azu@sysgo.de> + * + * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) + * + * 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 <asm/arch/ixp425.h> + +/* + * 14.7456 MHz + * Baud Rate = -------------- + * 16 x Divisor + */ +#define SERIAL_CLOCK 921600 + +DECLARE_GLOBAL_DATA_PTR; + +void serial_setbrg (void) +{ + unsigned int quot = 0; + int uart = CONFIG_SYS_IXP425_CONSOLE; + + if ((gd->baudrate <= SERIAL_CLOCK) && (SERIAL_CLOCK % gd->baudrate == 0)) + quot = SERIAL_CLOCK / gd->baudrate; + else + hang (); + + IER(uart) = 0; /* Disable for now */ + FCR(uart) = 0; /* No fifos enabled */ + + /* set baud rate */ + LCR(uart) = LCR_WLS0 | LCR_WLS1 | LCR_DLAB; + DLL(uart) = quot & 0xff; + DLH(uart) = quot >> 8; + LCR(uart) = LCR_WLS0 | LCR_WLS1; +#ifdef CONFIG_SERIAL_RTS_ACTIVE + MCR(uart) = MCR_RTS; /* set RTS active */ +#else + MCR(uart) = 0; /* set RTS inactive */ +#endif + IER(uart) = IER_UUE; +} + +/* + * Initialise the serial port with the given baudrate. The settings + * are always 8 data bits, no parity, 1 stop bit, no start bits. + * + */ +int serial_init (void) +{ + serial_setbrg (); + + return (0); +} + + +/* + * Output a single byte to the serial port. + */ +void serial_putc (const char c) +{ + /* wait for room in the tx FIFO on UART */ + while ((LSR(CONFIG_SYS_IXP425_CONSOLE) & LSR_TEMT) == 0); + + THR(CONFIG_SYS_IXP425_CONSOLE) = c; + + /* If \n, also do \r */ + if (c == '\n') + serial_putc ('\r'); +} + +/* + * Read a single byte from the serial port. Returns 1 on success, 0 + * otherwise. When the function is succesfull, the character read is + * written into its argument c. + */ +int serial_tstc (void) +{ + return LSR(CONFIG_SYS_IXP425_CONSOLE) & LSR_DR; +} + +/* + * Read a single byte from the serial port. Returns 1 on success, 0 + * otherwise. When the function is succesfull, the character read is + * written into its argument c. + */ +int serial_getc (void) +{ + while (!(LSR(CONFIG_SYS_IXP425_CONSOLE) & LSR_DR)); + + return (char) RBR(CONFIG_SYS_IXP425_CONSOLE) & 0xff; +} + +void +serial_puts (const char *s) +{ + while (*s) { + serial_putc (*s++); + } +} |