arch/mips/ite-boards/generic/puts.c

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