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fbdev
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bt455.h

bt455.h 2.0 KB
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  1. /*
    2. 

  2.  *	linux/drivers/video/bt455.h
    3. 

  3.  *
    4. 

  4.  *	Copyright 2003  Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de>
    5. 

  5.  *
    6. 

  6.  *	This file is subject to the terms and conditions of the GNU General
    7. 

  7.  *	Public License. See the file COPYING in the main directory of this
    8. 

  8.  *	archive for more details.
    9. 

  9.  */
    10. 

  10. #include <linux/types.h>
    11. 

  11. 

  12. /*
    13. 

  13.  * Bt455 byte-wide registers, 32-bit aligned.
    14. 

  14.  */
    15. 

  15. struct bt455_regs {
    16. 

  16. 	volatile u8 addr_cmap;
    17. 

  17. 	u8 pad0[3];
    18. 

  18. 	volatile u8 addr_cmap_data;
    19. 

  19. 	u8 pad1[3];
    20. 

  20. 	volatile u8 addr_clr;
    21. 

  21. 	u8 pad2[3];
    22. 

  22. 	volatile u8 addr_ovly;
    23. 

  23. 	u8 pad3[3];
    24. 

  24. };
    25. 

  25. 

  26. static inline void bt455_select_reg(struct bt455_regs *regs, int ir)
    27. 

  27. {
    28. 

  28. 	mb();
    29. 

  29. 	regs->addr_cmap = ir & 0x0f;
    30. 

  30. }
    31. 

  31. 

  32. /*
    33. 

  33.  * Read/write to a Bt455 color map register.
    34. 

  34.  */
    35. 

  35. static inline void bt455_read_cmap_entry(struct bt455_regs *regs, int cr,
    36. 

  36. 					 u8* red, u8* green, u8* blue)
    37. 

  37. {
    38. 

  38. 	bt455_select_reg(regs, cr);
    39. 

  39. 	mb();
    40. 

  40. 	*red = regs->addr_cmap_data & 0x0f;
    41. 

  41. 	rmb();
    42. 

  42. 	*green = regs->addr_cmap_data & 0x0f;
    43. 

  43. 	rmb();
    44. 

  44. 	*blue = regs->addr_cmap_data & 0x0f;
    45. 

  45. }
    46. 

  46. 

  47. static inline void bt455_write_cmap_entry(struct bt455_regs *regs, int cr,
    48. 

  48. 					  u8 red, u8 green, u8 blue)
    49. 

  49. {
    50. 

  50. 	bt455_select_reg(regs, cr);
    51. 

  51. 	wmb();
    52. 

  52. 	regs->addr_cmap_data = red & 0x0f;
    53. 

  53. 	wmb();
    54. 

  54. 	regs->addr_cmap_data = green & 0x0f;
    55. 

  55. 	wmb();
    56. 

  56. 	regs->addr_cmap_data = blue & 0x0f;
    57. 

  57. }
    58. 

  58. 

  59. static inline void bt455_write_ovly_entry(struct bt455_regs *regs, int cr,
    60. 

  60. 					  u8 red, u8 green, u8 blue)
    61. 

  61. {
    62. 

  62. 	bt455_select_reg(regs, cr);
    63. 

  63. 	wmb();
    64. 

  64. 	regs->addr_ovly = red & 0x0f;
    65. 

  65. 	wmb();
    66. 

  66. 	regs->addr_ovly = green & 0x0f;
    67. 

  67. 	wmb();
    68. 

  68. 	regs->addr_ovly = blue & 0x0f;
    69. 

  69. }
    70. 

  70. 

  71. static inline void bt455_set_cursor(struct bt455_regs *regs)
    72. 

  72. {
    73. 

  73. 	mb();
    74. 

  74. 	regs->addr_ovly = 0x0f;
    75. 

  75. 	wmb();
    76. 

  76. 	regs->addr_ovly = 0x0f;
    77. 

  77. 	wmb();
    78. 

  78. 	regs->addr_ovly = 0x0f;
    79. 

  79. }
    80. 

  80. 

  81. static inline void bt455_erase_cursor(struct bt455_regs *regs)
    82. 

  82. {
    83. 

  83. 	/* bt455_write_cmap_entry(regs, 8, 0x00, 0x00, 0x00); */
    84. 

  84. 	/* bt455_write_cmap_entry(regs, 9, 0x00, 0x00, 0x00); */
    85. 

  85. 	bt455_write_ovly_entry(regs, 8, 0x03, 0x03, 0x03);
    86. 

  86. 	bt455_write_ovly_entry(regs, 9, 0x07, 0x07, 0x07);
    87. 

  87. 

  88. 	wmb();
    89. 

  89. 	regs->addr_ovly = 0x09;
    90. 

  90. 	wmb();
    91. 

  91. 	regs->addr_ovly = 0x09;
    92. 

  92. 	wmb();
    93. 

  93. 	regs->addr_ovly = 0x09;
    94. 

  94. }
    95. 

  95.