| wdenk | 2d5b561 | 2003-10-14 19:43:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2002 |
| 3 | * Wolfgang Denk, DENX Software Engineering, <wd@denx.de> |
| 4 | * |
| 5 | * (C) Copyright 2002 |
| 6 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| 7 | * Marius Groeger <mgroeger@sysgo.de> |
| 8 | * |
| 9 | * (C) Copyright 2002 |
| 10 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| 11 | * Alex Zuepke <azu@sysgo.de> |
| 12 | * |
| 13 | * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or modify |
| 16 | * it under the terms of the GNU General Public License as published by |
| 17 | * the Free Software Foundation; either version 2 of the License, or |
| 18 | * (at your option) any later version. |
| 19 | * |
| 20 | * This program is distributed in the hope that it will be useful, |
| 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 23 | * GNU General Public License for more details. |
| 24 | * |
| 25 | * You should have received a copy of the GNU General Public License |
| 26 | * along with this program; if not, write to the Free Software |
| 27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 28 | * |
| 29 | */ |
| 30 | |
| 31 | #include <common.h> |
| 32 | #include <asm/arch/ixp425.h> |
| 33 | |
| 34 | void serial_setbrg (void) |
| 35 | { |
| 36 | DECLARE_GLOBAL_DATA_PTR; |
| 37 | |
| 38 | unsigned int quot = 0; |
| 39 | int uart = CFG_IXP425_CONSOLE; |
| 40 | |
| 41 | if (gd->baudrate == 1200) |
| 42 | quot = 192; |
| 43 | else if (gd->baudrate == 9600) |
| 44 | quot = 96; |
| 45 | else if (gd->baudrate == 19200) |
| 46 | quot = 48; |
| 47 | else if (gd->baudrate == 38400) |
| 48 | quot = 24; |
| 49 | else if (gd->baudrate == 57600) |
| 50 | quot = 16; |
| 51 | else if (gd->baudrate == 115200) |
| 52 | quot = 8; |
| 53 | else |
| 54 | hang (); |
| 55 | |
| 56 | IER(uart) = 0; /* Disable for now */ |
| 57 | FCR(uart) = 0; /* No fifos enabled */ |
| 58 | |
| 59 | /* set baud rate */ |
| 60 | LCR(uart) = LCR_WLS0 | LCR_WLS1 | LCR_DLAB; |
| 61 | DLL(uart) = quot & 0xff; |
| 62 | DLH(uart) = quot >> 8; |
| 63 | LCR(uart) = LCR_WLS0 | LCR_WLS1; |
| 64 | |
| 65 | IER(uart) = IER_UUE; |
| 66 | } |
| 67 | |
| 68 | |
| 69 | /* |
| 70 | * Initialise the serial port with the given baudrate. The settings |
| 71 | * are always 8 data bits, no parity, 1 stop bit, no start bits. |
| 72 | * |
| 73 | */ |
| 74 | int serial_init (void) |
| 75 | { |
| 76 | serial_setbrg (); |
| 77 | |
| 78 | return (0); |
| 79 | } |
| 80 | |
| 81 | |
| 82 | /* |
| 83 | * Output a single byte to the serial port. |
| 84 | */ |
| 85 | void serial_putc (const char c) |
| 86 | { |
| 87 | /* wait for room in the tx FIFO on UART */ |
| 88 | while ((LSR(CFG_IXP425_CONSOLE) & LSR_TEMT) == 0); |
| 89 | |
| 90 | THR(CFG_IXP425_CONSOLE) = c; |
| 91 | |
| 92 | /* If \n, also do \r */ |
| 93 | if (c == '\n') |
| 94 | serial_putc ('\r'); |
| 95 | } |
| 96 | |
| 97 | /* |
| 98 | * Read a single byte from the serial port. Returns 1 on success, 0 |
| 99 | * otherwise. When the function is succesfull, the character read is |
| 100 | * written into its argument c. |
| 101 | */ |
| 102 | int serial_tstc (void) |
| 103 | { |
| 104 | return LSR(CFG_IXP425_CONSOLE) & LSR_DR; |
| 105 | } |
| 106 | |
| 107 | /* |
| 108 | * Read a single byte from the serial port. Returns 1 on success, 0 |
| 109 | * otherwise. When the function is succesfull, the character read is |
| 110 | * written into its argument c. |
| 111 | */ |
| 112 | int serial_getc (void) |
| 113 | { |
| 114 | while (!(LSR(CFG_IXP425_CONSOLE) & LSR_DR)); |
| 115 | |
| 116 | return (char) RBR(CFG_IXP425_CONSOLE) & 0xff; |
| 117 | } |
| 118 | |
| 119 | void |
| 120 | serial_puts (const char *s) |
| 121 | { |
| 122 | while (*s) { |
| 123 | serial_putc (*s++); |
| 124 | } |
| 125 | } |