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 /* Display values from last command.
  34  * Memory modify remembered values are different from display memory.
  35  */
  36 static uint in_last_addr, in_last_size;
  37 static uint out_last_addr, out_last_size, out_last_value;
  38
  39
  40 int do_portio_out (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
  41 {
  42         uint addr = out_last_addr;
  43         uint size = out_last_size;
  44         uint value = out_last_value;
  45
  46         if (argc != 3)
  47                 return cmd_usage(cmdtp);
  48
  49         if ((flag & CMD_FLAG_REPEAT) == 0) {
  50                 /*
  51                  * New command specified.  Check for a size specification.
  52                  * Defaults to long if no or incorrect specification.
  53                  */
  54                 size = cmd_get_data_size (argv[0], 1);
  55                 addr = simple_strtoul (argv[1], NULL, 16);
  56                 value = simple_strtoul (argv[2], NULL, 16);
  57         }
  58 #if defined (CONFIG_X86)
  59
  60         {
  61                 unsigned short port = addr;
  62
  63                 switch (size) {
  64                 default:
  65                 case 1:
  66                     {
  67                         unsigned char ch = value;
  68                         __asm__ volatile ("out %0, %%dx"::"a" (ch), "d" (port));
  69                     }
  70                         break;
  71                 case 2:
  72                     {
  73                         unsigned short w = value;
  74                         __asm__ volatile ("out %0, %%dx"::"a" (w), "d" (port));
  75                     }
  76                         break;
  77                 case 4:
  78                         __asm__ volatile ("out %0, %%dx"::"a" (value), "d" (port));
  79
  80                         break;
  81                 }
  82         }
  83
  84 #endif                                                  /* CONFIG_X86 */
  85
  86         out_last_addr = addr;
  87         out_last_size = size;
  88         out_last_value = value;
  89
  90         return 0;
  91 }
  92
  93 U_BOOT_CMD(
  94         out,    3,      1,      do_portio_out,
  95         "write datum to IO port",
  96         "[.b, .w, .l] port value\n    - output to IO port"
  97 );
  98
  99 int do_portio_in (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
 100 {
 101         uint addr = in_last_addr;
 102         uint size = in_last_size;
 103
 104         if (argc != 2)
 105                 return cmd_usage(cmdtp);
 106
 107         if ((flag & CMD_FLAG_REPEAT) == 0) {
 108                 /*
 109                  * New command specified.  Check for a size specification.
 110                  * Defaults to long if no or incorrect specification.
 111                  */
 112                 size = cmd_get_data_size (argv[0], 1);
 113                 addr = simple_strtoul (argv[1], NULL, 16);
 114         }
 115 #if defined (CONFIG_X86)
 116
 117         {
 118                 unsigned short port = addr;
 119
 120                 switch (size) {
 121                 default:
 122                 case 1:
 123                     {
 124                         unsigned char ch;
 125                         __asm__ volatile ("in %%dx, %0":"=a" (ch):"d" (port));
 126
 127                         printf (" %02x\n", ch);
 128                     }
 129                         break;
 130                 case 2:
 131                     {
 132                         unsigned short w;
 133                         __asm__ volatile ("in %%dx, %0":"=a" (w):"d" (port));
 134
 135                         printf (" %04x\n", w);
 136                     }
 137                         break;
 138                 case 4:
 139                     {
 140                         unsigned long l;
 141                         __asm__ volatile ("in %%dx, %0":"=a" (l):"d" (port));
 142
 143                         printf (" %08lx\n", l);
 144                     }
 145                         break;
 146                 }
 147         }
 148 #endif  /* CONFIG_X86 */
 149
 150         in_last_addr = addr;
 151         in_last_size = size;
 152
 153         return 0;
 154 }
 155
 156 U_BOOT_CMD(
 157         in,     2,      1,      do_portio_in,
 158         "read data from an IO port",
 159         "[.b, .w, .l] port\n"
 160         "    - read datum from IO port"
 161 );