cmd_portio.c 3.5 KB

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  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. * Port I/O Functions
  25. *
  26. * Copied from FADS ROM, Dan Malek (dmalek@jlc.net)
  27. */
  28. #include <common.h>
  29. #include <command.h>
  30. /* Display values from last command.
  31. * Memory modify remembered values are different from display memory.
  32. */
  33. static uint in_last_addr, in_last_size;
  34. static uint out_last_addr, out_last_size, out_last_value;
  35. int do_portio_out (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
  36. {
  37. uint addr = out_last_addr;
  38. uint size = out_last_size;
  39. uint value = out_last_value;
  40. if (argc != 3)
  41. return CMD_RET_USAGE;
  42. if ((flag & CMD_FLAG_REPEAT) == 0) {
  43. /*
  44. * New command specified. Check for a size specification.
  45. * Defaults to long if no or incorrect specification.
  46. */
  47. size = cmd_get_data_size (argv[0], 1);
  48. addr = simple_strtoul (argv[1], NULL, 16);
  49. value = simple_strtoul (argv[2], NULL, 16);
  50. }
  51. #if defined (CONFIG_X86)
  52. {
  53. unsigned short port = addr;
  54. switch (size) {
  55. default:
  56. case 1:
  57. {
  58. unsigned char ch = value;
  59. __asm__ volatile ("out %0, %%dx"::"a" (ch), "d" (port));
  60. }
  61. break;
  62. case 2:
  63. {
  64. unsigned short w = value;
  65. __asm__ volatile ("out %0, %%dx"::"a" (w), "d" (port));
  66. }
  67. break;
  68. case 4:
  69. __asm__ volatile ("out %0, %%dx"::"a" (value), "d" (port));
  70. break;
  71. }
  72. }
  73. #endif /* CONFIG_X86 */
  74. out_last_addr = addr;
  75. out_last_size = size;
  76. out_last_value = value;
  77. return 0;
  78. }
  79. U_BOOT_CMD(
  80. out, 3, 1, do_portio_out,
  81. "write datum to IO port",
  82. "[.b, .w, .l] port value\n - output to IO port"
  83. );
  84. int do_portio_in (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
  85. {
  86. uint addr = in_last_addr;
  87. uint size = in_last_size;
  88. if (argc != 2)
  89. return CMD_RET_USAGE;
  90. if ((flag & CMD_FLAG_REPEAT) == 0) {
  91. /*
  92. * New command specified. Check for a size specification.
  93. * Defaults to long if no or incorrect specification.
  94. */
  95. size = cmd_get_data_size (argv[0], 1);
  96. addr = simple_strtoul (argv[1], NULL, 16);
  97. }
  98. #if defined (CONFIG_X86)
  99. {
  100. unsigned short port = addr;
  101. switch (size) {
  102. default:
  103. case 1:
  104. {
  105. unsigned char ch;
  106. __asm__ volatile ("in %%dx, %0":"=a" (ch):"d" (port));
  107. printf (" %02x\n", ch);
  108. }
  109. break;
  110. case 2:
  111. {
  112. unsigned short w;
  113. __asm__ volatile ("in %%dx, %0":"=a" (w):"d" (port));
  114. printf (" %04x\n", w);
  115. }
  116. break;
  117. case 4:
  118. {
  119. unsigned long l;
  120. __asm__ volatile ("in %%dx, %0":"=a" (l):"d" (port));
  121. printf (" %08lx\n", l);
  122. }
  123. break;
  124. }
  125. }
  126. #endif /* CONFIG_X86 */
  127. in_last_addr = addr;
  128. in_last_size = size;
  129. return 0;
  130. }
  131. U_BOOT_CMD(
  132. in, 2, 1, do_portio_in,
  133. "read data from an IO port",
  134. "[.b, .w, .l] port\n"
  135. " - read datum from IO port"
  136. );