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 *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                 cmd_usage(cmdtp);
  48                 return 1;
  49         }
  50
  51         if ((flag & CMD_FLAG_REPEAT) == 0) {
  52                 /* New command specified.  Check for a size specification.
  53                  * Defaults to long if no or incorrect specification.
  54                  */
  55                 size = cmd_get_data_size (argv[0], 1);
  56                 addr = simple_strtoul (argv[1], NULL, 16);
  57                 value = simple_strtoul (argv[2], NULL, 16);
  58         }
  59 #if defined (CONFIG_X86)
  60
  61         {
  62                 unsigned short port = addr;
  63
  64                 switch (size) {
  65                 default:
  66                 case 1:
  67                     {
  68                         unsigned char ch = value;
  69                         __asm__ volatile ("out %0, %%dx"::"a" (ch), "d" (port));
  70                     }
  71                         break;
  72                 case 2:
  73                     {
  74                         unsigned short w = value;
  75                         __asm__ volatile ("out %0, %%dx"::"a" (w), "d" (port));
  76                     }
  77                         break;
  78                 case 4:
  79                         __asm__ volatile ("out %0, %%dx"::"a" (value), "d" (port));
  80
  81                         break;
  82                 }
  83         }
  84
  85 #endif                                                  /* CONFIG_X86 */
  86
  87         out_last_addr = addr;
  88         out_last_size = size;
  89         out_last_value = value;
  90
  91         return 0;
  92 }
  93
  94 U_BOOT_CMD(
  95         out,    3,      1,      do_portio_out,
  96         "write datum to IO port",
  97         "[.b, .w, .l] port value\n    - output to IO port"
  98 );
  99
 100 int do_portio_in (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 101 {
 102         uint addr = in_last_addr;
 103         uint size = in_last_size;
 104
 105         if (argc != 2) {
 106                 cmd_usage(cmdtp);
 107                 return 1;
 108         }
 109
 110         if ((flag & CMD_FLAG_REPEAT) == 0) {
 111                 /* New command specified.  Check for a size specification.
 112                  * Defaults to long if no or incorrect specification.
 113                  */
 114                 size = cmd_get_data_size (argv[0], 1);
 115                 addr = simple_strtoul (argv[1], NULL, 16);
 116         }
 117 #if defined (CONFIG_X86)
 118
 119         {
 120                 unsigned short port = addr;
 121
 122                 switch (size) {
 123                 default:
 124                 case 1:
 125                     {
 126                         unsigned char ch;
 127                         __asm__ volatile ("in %%dx, %0":"=a" (ch):"d" (port));
 128
 129                         printf (" %02x\n", ch);
 130                     }
 131                         break;
 132                 case 2:
 133                     {
 134                         unsigned short w;
 135                         __asm__ volatile ("in %%dx, %0":"=a" (w):"d" (port));
 136
 137                         printf (" %04x\n", w);
 138                     }
 139                         break;
 140                 case 4:
 141                     {
 142                         unsigned long l;
 143                         __asm__ volatile ("in %%dx, %0":"=a" (l):"d" (port));
 144
 145                         printf (" %08lx\n", l);
 146                     }
 147                         break;
 148                 }
 149         }
 150 #endif  /* CONFIG_X86 */
 151
 152         in_last_addr = addr;
 153         in_last_size = size;
 154
 155         return 0;
 156 }
 157
 158 U_BOOT_CMD(
 159         in,     2,      1,      do_portio_in,
 160         "read data from an IO port",
 161         "[.b, .w, .l] port\n"
 162         "    - read datum from IO port"
 163 );