sharpsl_param.c 1.7 KB

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  1. /*
  2. * Hardware parameter area specific to Sharp SL series devices
  3. *
  4. * Copyright (c) 2005 Richard Purdie
  5. *
  6. * Based on Sharp's 2.4 kernel patches
  7. *
  8. * This program is free software; you can redistribute it and/or modify
  9. * it under the terms of the GNU General Public License version 2 as
  10. * published by the Free Software Foundation.
  11. *
  12. */
  13. #include <linux/kernel.h>
  14. #include <linux/string.h>
  15. #include <asm/mach/sharpsl_param.h>
  16. /*
  17. * Certain hardware parameters determined at the time of device manufacture,
  18. * typically including LCD parameters are loaded by the bootloader at the
  19. * address PARAM_BASE. As the kernel will overwrite them, we need to store
  20. * them early in the boot process, then pass them to the appropriate drivers.
  21. * Not all devices use all paramaters but the format is common to all.
  22. */
  23. #ifdef CONFIG_ARCH_SA1100
  24. #define PARAM_BASE 0xe8ffc000
  25. #else
  26. #define PARAM_BASE 0xa0000a00
  27. #endif
  28. #define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 ) | ( b << 8 ) | a )
  29. #define COMADJ_MAGIC MAGIC_CHG('C','M','A','D')
  30. #define UUID_MAGIC MAGIC_CHG('U','U','I','D')
  31. #define TOUCH_MAGIC MAGIC_CHG('T','U','C','H')
  32. #define AD_MAGIC MAGIC_CHG('B','V','A','D')
  33. #define PHAD_MAGIC MAGIC_CHG('P','H','A','D')
  34. struct sharpsl_param_info sharpsl_param;
  35. void sharpsl_save_param(void)
  36. {
  37. memcpy(&sharpsl_param, (void *)PARAM_BASE, sizeof(struct sharpsl_param_info));
  38. if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
  39. sharpsl_param.comadj=-1;
  40. if (sharpsl_param.phad_keyword != PHAD_MAGIC)
  41. sharpsl_param.phadadj=-1;
  42. if (sharpsl_param.uuid_keyword != UUID_MAGIC)
  43. sharpsl_param.uuid[0]=-1;
  44. if (sharpsl_param.touch_keyword != TOUCH_MAGIC)
  45. sharpsl_param.touch_xp=-1;
  46. if (sharpsl_param.adadj_keyword != AD_MAGIC)
  47. sharpsl_param.adadj=-1;
  48. }