arch/mips/au1000/common/puts.c

   1 /*
   2  *
   3  * BRIEF MODULE DESCRIPTION
   4  *      Low level uart routines to directly access a 16550 uart.
   5  *
   6  * Copyright 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 #include <asm/mach-au1x00/au1000.h>
  33
  34 #define SERIAL_BASE   UART_BASE
  35 #define SER_CMD       0x7
  36 #define SER_DATA      0x1
  37 #define TX_BUSY       0x20
  38
  39 #define TIMEOUT       0xffffff
  40 #define SLOW_DOWN
  41
  42 static const char digits[16] = "0123456789abcdef";
  43 static volatile unsigned long * const com1 = (unsigned long *)SERIAL_BASE;
  44
  45
  46 #ifdef SLOW_DOWN
  47 static inline void slow_down(void)
  48 {
  49     int k;
  50     for (k=0; k<10000; k++);
  51 }
  52 #else
  53 #define slow_down()
  54 #endif
  55
  56 void
  57 putch(const unsigned char c)
  58 {
  59     unsigned char ch;
  60     int i = 0;
  61
  62     do {
  63         ch = com1[SER_CMD];
  64         slow_down();
  65         i++;
  66         if (i>TIMEOUT) {
  67             break;
  68         }
  69     } while (0 == (ch & TX_BUSY));
  70     com1[SER_DATA] = c;
  71 }
  72
  73 void
  74 puts(unsigned char *cp)
  75 {
  76     unsigned char ch;
  77     int i = 0;
  78
  79     while (*cp) {
  80         do {
  81              ch = com1[SER_CMD];
  82             slow_down();
  83             i++;
  84             if (i>TIMEOUT) {
  85                 break;
  86             }
  87         } while (0 == (ch & TX_BUSY));
  88         com1[SER_DATA] = *cp++;
  89     }
  90     putch('\r');
  91     putch('\n');
  92 }
  93
  94 void
  95 fputs(const char *cp)
  96 {
  97     unsigned char ch;
  98     int i = 0;
  99
 100     while (*cp) {
 101
 102         do {
 103              ch = com1[SER_CMD];
 104              slow_down();
 105             i++;
 106             if (i>TIMEOUT) {
 107                 break;
 108             }
 109         } while (0 == (ch & TX_BUSY));
 110         com1[SER_DATA] = *cp++;
 111     }
 112 }
 113
 114
 115 void
 116 put64(uint64_t ul)
 117 {
 118     int cnt;
 119     unsigned ch;
 120
 121     cnt = 16;            /* 16 nibbles in a 64 bit long */
 122     putch('0');
 123     putch('x');
 124     do {
 125         cnt--;
 126         ch = (unsigned char)(ul >> cnt * 4) & 0x0F;
 127                 putch(digits[ch]);
 128     } while (cnt > 0);
 129 }
 130
 131 void
 132 put32(unsigned u)
 133 {
 134     int cnt;
 135     unsigned ch;
 136
 137     cnt = 8;            /* 8 nibbles in a 32 bit long */
 138     putch('0');
 139     putch('x');
 140     do {
 141         cnt--;
 142         ch = (unsigned char)(u >> cnt * 4) & 0x0F;
 143                 putch(digits[ch]);
 144     } while (cnt > 0);
 145 }