Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | /* * * BRIEF MODULE DESCRIPTION * Low level uart routines to directly access a 16550 uart. * * Copyright 2000,2001 MontaVista Software Inc. * Author: MontaVista Software, Inc. * ppopov@mvista.com or source@mvista.com * * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * 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., * 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/types.h> #define SERIAL_BASE 0xB4011800 /* it8172 */ #define SER_CMD 5 #define SER_DATA 0x00 #define TX_BUSY 0x20 #define TIMEOUT 0xffff #undef SLOW_DOWN static const char digits[16] = "0123456789abcdef"; static volatile unsigned char *const com1 = (unsigned char *) SERIAL_BASE; #ifdef SLOW_DOWN static inline void slow_down() { int k; for (k = 0; k < 10000; k++); } #else #define slow_down() #endif void putch(const unsigned char c) { unsigned char ch; int i = 0; do { ch = com1[SER_CMD]; slow_down(); i++; if (i > TIMEOUT) { break; } } while (0 == (ch & TX_BUSY)); com1[SER_DATA] = c; } void puts(unsigned char *cp) { unsigned char ch; int i = 0; while (*cp) { do { ch = com1[SER_CMD]; slow_down(); i++; if (i > TIMEOUT) { break; } } while (0 == (ch & TX_BUSY)); com1[SER_DATA] = *cp++; } putch('\r'); putch('\n'); } void fputs(unsigned char *cp) { unsigned char ch; int i = 0; while (*cp) { do { ch = com1[SER_CMD]; slow_down(); i++; if (i > TIMEOUT) { break; } } while (0 == (ch & TX_BUSY)); com1[SER_DATA] = *cp++; } } void put64(uint64_t ul) { int cnt; unsigned ch; cnt = 16; /* 16 nibbles in a 64 bit long */ putch('0'); putch('x'); do { cnt--; ch = (unsigned char) (ul >> cnt * 4) & 0x0F; putch(digits[ch]); } while (cnt > 0); } void put32(unsigned u) { int cnt; unsigned ch; cnt = 8; /* 8 nibbles in a 32 bit long */ putch('0'); putch('x'); do { cnt--; ch = (unsigned char) (u >> cnt * 4) & 0x0F; putch(digits[ch]); } while (cnt > 0); } |