common/cmd_portio.c

   1 /*
   2  * (C) Copyright 2003
   3  * Marc Singer, elf@buici.com
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * Port I/O Functions
  26  *
  27  * Copied from FADS ROM, Dan Malek (dmalek@jlc.net)
  28  */
  29
  30 #include <common.h>
  31 #include <command.h>
  32
  33 #if (CONFIG_COMMANDS & CFG_CMD_PORTIO)
  34
  35 extern int cmd_get_data_size (char *arg, int default_size);
  36
  37 /* Display values from last command.
  38  * Memory modify remembered values are different from display memory.
  39  */
  40 static uint in_last_addr, in_last_size;
  41 static uint out_last_addr, out_last_size, out_last_value;
  42
  43
  44 int do_portio_out (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
  45 {
  46         uint addr = out_last_addr;
  47         uint size = out_last_size;
  48         uint value = out_last_value;
  49
  50         if (argc != 3) {
  51                 printf ("Usage:\n%s\n", cmdtp->usage);
  52                 return 1;
  53         }
  54
  55         if ((flag & CMD_FLAG_REPEAT) == 0) {
  56                 /* New command specified.  Check for a size specification.
  57                  * Defaults to long if no or incorrect specification.
  58                  */
  59                 size = cmd_get_data_size (argv[0], 1);
  60                 addr = simple_strtoul (argv[1], NULL, 16);
  61                 value = simple_strtoul (argv[2], NULL, 16);
  62         }
  63 #if defined (CONFIG_X86)
  64
  65         {
  66                 unsigned short port = addr;
  67
  68                 switch (size) {
  69                 default:
  70                 case 1:
  71                     {
  72                         unsigned char ch = value;
  73                         __asm__ volatile ("out %0, %%dx"::"a" (ch), "d" (port));
  74                     }
  75                         break;
  76                 case 2:
  77                     {
  78                         unsigned short w = value;
  79                         __asm__ volatile ("out %0, %%dx"::"a" (w), "d" (port));
  80                     }
  81                         break;
  82                 case 4:
  83                         __asm__ volatile ("out %0, %%dx"::"a" (value), "d" (port));
  84
  85                         break;
  86                 }
  87         }
  88
  89 #endif                                                  /* CONFIG_X86 */
  90
  91         out_last_addr = addr;
  92         out_last_size = size;
  93         out_last_value = value;
  94
  95         return 0;
  96 }
  97
  98 U_BOOT_CMD(
  99         out,    3,      1,      do_portio_out,
 100         "out     - write datum to IO port\n",
 101         "[.b, .w, .l] port value\n    - output to IO port\n"
 102 );
 103
 104 int do_portio_in (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 105 {
 106         uint addr = in_last_addr;
 107         uint size = in_last_size;
 108
 109         if (argc != 2) {
 110                 printf ("Usage:\n%s\n", cmdtp->usage);
 111                 return 1;
 112         }
 113
 114         if ((flag & CMD_FLAG_REPEAT) == 0) {
 115                 /* New command specified.  Check for a size specification.
 116                  * Defaults to long if no or incorrect specification.
 117                  */
 118                 size = cmd_get_data_size (argv[0], 1);
 119                 addr = simple_strtoul (argv[1], NULL, 16);
 120         }
 121 #if defined (CONFIG_X86)
 122
 123         {
 124                 unsigned short port = addr;
 125
 126                 switch (size) {
 127                 default:
 128                 case 1:
 129                     {
 130                         unsigned char ch;
 131                         __asm__ volatile ("in %%dx, %0":"=a" (ch):"d" (port));
 132
 133                         printf (" %02x\n", ch);
 134                     }
 135                         break;
 136                 case 2:
 137                     {
 138                         unsigned short w;
 139                         __asm__ volatile ("in %%dx, %0":"=a" (w):"d" (port));
 140
 141                         printf (" %04x\n", w);
 142                     }
 143                         break;
 144                 case 4:
 145                     {
 146                         unsigned long l;
 147                         __asm__ volatile ("in %%dx, %0":"=a" (l):"d" (port));
 148
 149                         printf (" %08lx\n", l);
 150                     }
 151                         break;
 152                 }
 153         }
 154 #endif  /* CONFIG_X86 */
 155
 156         in_last_addr = addr;
 157         in_last_size = size;
 158
 159         return 0;
 160 }
 161
 162 U_BOOT_CMD(
 163         in,     2,      1,      do_portio_in,
 164         "in      - read data from an IO port\n",
 165         "[.b, .w, .l] port\n"
 166         "    - read datum from IO port\n"
 167 );
 168
 169 #endif  /* CFG_CMD_PORTIO */