env_nvram.c 4.0 KB

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  1. /*
  2. * (C) Copyright 2000-2002
  3. * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  4. *
  5. * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  6. * Andreas Heppel <aheppel@sysgo.de>
  7. * See file CREDITS for list of people who contributed to this
  8. * project.
  9. *
  10. * This program is free software; you can redistribute it and/or
  11. * modify it under the terms of the GNU General Public License as
  12. * published by the Free Software Foundation; either version 2 of
  13. * the License, or (at your option) any later version.
  14. *
  15. * This program is distributed in the hope that it will be useful,
  16. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18. * GNU General Public License for more details.
  19. *
  20. * You should have received a copy of the GNU General Public License
  21. * along with this program; if not, write to the Free Software
  22. * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23. * MA 02111-1307 USA
  24. */
  25. /*
  26. * 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
  27. *
  28. * It might not be possible in all cases to use 'memcpy()' to copy
  29. * the environment to NVRAM, as the NVRAM might not be mapped into
  30. * the memory space. (I.e. this is the case for the BAB750). In those
  31. * cases it might be possible to access the NVRAM using a different
  32. * method. For example, the RTC on the BAB750 is accessible in IO
  33. * space using its address and data registers. To enable usage of
  34. * NVRAM in those cases I invented the functions 'nvram_read()' and
  35. * 'nvram_write()', which will be activated upon the configuration
  36. * #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are
  37. * strongly dependent on the used HW, and must be redefined for each
  38. * board that wants to use them.
  39. */
  40. #include <common.h>
  41. #include <command.h>
  42. #include <environment.h>
  43. #include <linux/stddef.h>
  44. DECLARE_GLOBAL_DATA_PTR;
  45. #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
  46. extern void *nvram_read(void *dest, const long src, size_t count);
  47. extern void nvram_write(long dest, const void *src, size_t count);
  48. env_t *env_ptr = NULL;
  49. #else
  50. env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
  51. #endif
  52. char * env_name_spec = "NVRAM";
  53. extern uchar default_environment[];
  54. #ifdef CONFIG_AMIGAONEG3SE
  55. uchar env_get_char_spec (int index)
  56. {
  57. #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
  58. uchar c;
  59. nvram_read(&c, CONFIG_ENV_ADDR+index, 1);
  60. return c;
  61. #else
  62. uchar retval;
  63. enable_nvram();
  64. retval = *((uchar *)(gd->env_addr + index));
  65. disable_nvram();
  66. return retval;
  67. #endif
  68. }
  69. #else
  70. uchar env_get_char_spec (int index)
  71. {
  72. #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
  73. uchar c;
  74. nvram_read(&c, CONFIG_ENV_ADDR+index, 1);
  75. return c;
  76. #else
  77. return *((uchar *)(gd->env_addr + index));
  78. #endif
  79. }
  80. #endif
  81. void env_relocate_spec (void)
  82. {
  83. #if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
  84. nvram_read(env_ptr, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
  85. #else
  86. memcpy (env_ptr, (void*)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
  87. #endif
  88. }
  89. int saveenv (void)
  90. {
  91. int rcode = 0;
  92. #ifdef CONFIG_AMIGAONEG3SE
  93. enable_nvram();
  94. #endif
  95. #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
  96. nvram_write(CONFIG_ENV_ADDR, env_ptr, CONFIG_ENV_SIZE);
  97. #else
  98. if (memcpy ((char *)CONFIG_ENV_ADDR, env_ptr, CONFIG_ENV_SIZE) == NULL)
  99. rcode = 1 ;
  100. #endif
  101. #ifdef CONFIG_AMIGAONEG3SE
  102. udelay(10000);
  103. disable_nvram();
  104. #endif
  105. return rcode;
  106. }
  107. /************************************************************************
  108. * Initialize Environment use
  109. *
  110. * We are still running from ROM, so data use is limited
  111. */
  112. int env_init (void)
  113. {
  114. #ifdef CONFIG_AMIGAONEG3SE
  115. enable_nvram();
  116. #endif
  117. #if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
  118. ulong crc;
  119. uchar data[ENV_SIZE];
  120. nvram_read (&crc, CONFIG_ENV_ADDR, sizeof(ulong));
  121. nvram_read (data, CONFIG_ENV_ADDR+sizeof(ulong), ENV_SIZE);
  122. if (crc32(0, data, ENV_SIZE) == crc) {
  123. gd->env_addr = (ulong)CONFIG_ENV_ADDR + sizeof(long);
  124. #else
  125. if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
  126. gd->env_addr = (ulong)&(env_ptr->data);
  127. #endif
  128. gd->env_valid = 1;
  129. } else {
  130. gd->env_addr = (ulong)&default_environment[0];
  131. gd->env_valid = 0;
  132. }
  133. #ifdef CONFIG_AMIGAONEG3SE
  134. disable_nvram();
  135. #endif
  136. return (0);
  137. }