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Diffstat (limited to 'cpu/sa1100/serial.c')
| -rw-r--r-- | cpu/sa1100/serial.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/cpu/sa1100/serial.c b/cpu/sa1100/serial.c new file mode 100644 index 000000000..68bcd1f2a --- /dev/null +++ b/cpu/sa1100/serial.c @@ -0,0 +1,158 @@ +/* + * (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 <SA-1100.h> + +void serial_setbrg (void) +{ + DECLARE_GLOBAL_DATA_PTR; + + unsigned int reg = 0; + + if (gd->baudrate == 1200) + reg = 191; + else if (gd->baudrate == 9600) + reg = 23; + else if (gd->baudrate == 19200) + reg = 11; + else if (gd->baudrate == 38400) + reg = 5; + else if (gd->baudrate == 57600) + reg = 3; + else if (gd->baudrate == 115200) + reg = 1; + else + hang (); + +#ifdef CONFIG_SERIAL1 + /* Wait until port is ready ... */ + while (Ser1UTSR1 & UTSR1_TBY) { + } + + /* init serial serial 1 */ + Ser1UTCR3 = 0x00; + Ser1UTSR0 = 0xff; + Ser1UTCR0 = (UTCR0_1StpBit | UTCR0_8BitData); + Ser1UTCR1 = 0; + Ser1UTCR2 = (u32) reg; + Ser1UTCR3 = (UTCR3_RXE | UTCR3_TXE); +#elif CONFIG_SERIAL3 + /* Wait until port is ready ... */ + while (Ser3UTSR1 & UTSR1_TBY) { + } + + /* init serial serial 3 */ + Ser3UTCR3 = 0x00; + Ser3UTSR0 = 0xff; + Ser3UTCR0 = (UTCR0_1StpBit | UTCR0_8BitData); + Ser3UTCR1 = 0; + Ser3UTCR2 = (u32) reg; + Ser3UTCR3 = (UTCR3_RXE | UTCR3_TXE); +#else +#error "Bad: you didn't configured serial ..." +#endif +} + + +/* + * 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) +{ +#ifdef CONFIG_SERIAL1 + /* wait for room in the tx FIFO on SERIAL1 */ + while ((Ser1UTSR0 & UTSR0_TFS) == 0); + + Ser1UTDR = c; +#elif CONFIG_SERIAL3 + /* wait for room in the tx FIFO on SERIAL3 */ + while ((Ser3UTSR0 & UTSR0_TFS) == 0); + + Ser3UTDR = c; +#endif + + /* 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) +{ +#ifdef CONFIG_SERIAL1 + return Ser1UTSR1 & UTSR1_RNE; +#elif CONFIG_SERIAL3 + return Ser3UTSR1 & UTSR1_RNE; +#endif +} + +/* + * 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) +{ +#ifdef CONFIG_SERIAL1 + while (!(Ser1UTSR1 & UTSR1_RNE)); + + return (char) Ser1UTDR & 0xff; +#elif CONFIG_SERIAL3 + while (!(Ser3UTSR1 & UTSR1_RNE)); + + return (char) Ser3UTDR & 0xff; +#endif +} + +void +serial_puts (const char *s) +{ + while (*s) { + serial_putc (*s++); + } +} |