maxinefb.c 4.6 KB

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  1. /*
  2. * linux/drivers/video/maxinefb.c
  3. *
  4. * DECstation 5000/xx onboard framebuffer support ... derived from:
  5. * "HP300 Topcat framebuffer support (derived from macfb of all things)
  6. * Phil Blundell <philb@gnu.org> 1998", the original code can be
  7. * found in the file hpfb.c in the same directory.
  8. *
  9. * DECstation related code Copyright (C) 1999,2000,2001 by
  10. * Michael Engel <engel@unix-ag.org> and
  11. * Karsten Merker <merker@linuxtag.org>.
  12. * This file is subject to the terms and conditions of the GNU General
  13. * Public License. See the file COPYING in the main directory of this
  14. * archive for more details.
  15. *
  16. */
  17. /*
  18. * Changes:
  19. * 2001/01/27 removed debugging and testing code, fixed fb_ops
  20. * initialization which had caused a crash before,
  21. * general cleanup, first official release (KM)
  22. *
  23. */
  24. #include <linux/module.h>
  25. #include <linux/kernel.h>
  26. #include <linux/errno.h>
  27. #include <linux/string.h>
  28. #include <linux/mm.h>
  29. #include <linux/slab.h>
  30. #include <linux/delay.h>
  31. #include <linux/init.h>
  32. #include <linux/fb.h>
  33. #include <video/maxinefb.h>
  34. /* bootinfo.h defines the machine type values, needed when checking */
  35. /* whether are really running on a maxine, KM */
  36. #include <asm/bootinfo.h>
  37. static struct fb_info fb_info;
  38. static struct fb_var_screeninfo maxinefb_defined = {
  39. .xres = 1024,
  40. .yres = 768,
  41. .xres_virtual = 1024,
  42. .yres_virtual = 768,
  43. .bits_per_pixel =8,
  44. .activate = FB_ACTIVATE_NOW,
  45. .height = -1,
  46. .width = -1,
  47. .vmode = FB_VMODE_NONINTERLACED,
  48. };
  49. static struct fb_fix_screeninfo maxinefb_fix = {
  50. .id = "Maxine",
  51. .smem_len = (1024*768),
  52. .type = FB_TYPE_PACKED_PIXELS,
  53. .visual = FB_VISUAL_PSEUDOCOLOR,
  54. .line_length = 1024,
  55. };
  56. /* Handle the funny Inmos RamDAC/video controller ... */
  57. void maxinefb_ims332_write_register(int regno, register unsigned int val)
  58. {
  59. register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
  60. unsigned char *wptr;
  61. wptr = regs + 0xa0000 + (regno << 4);
  62. *((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;
  63. *((volatile unsigned short *) (wptr)) = val;
  64. }
  65. unsigned int maxinefb_ims332_read_register(int regno)
  66. {
  67. register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
  68. unsigned char *rptr;
  69. register unsigned int j, k;
  70. rptr = regs + 0x80000 + (regno << 4);
  71. j = *((volatile unsigned short *) rptr);
  72. k = *((volatile unsigned short *) regs);
  73. return (j & 0xffff) | ((k & 0xff00) << 8);
  74. }
  75. /* Set the palette */
  76. static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
  77. unsigned blue, unsigned transp, struct fb_info *info)
  78. {
  79. /* value to be written into the palette reg. */
  80. unsigned long hw_colorvalue = 0;
  81. red >>= 8; /* The cmap fields are 16 bits */
  82. green >>= 8; /* wide, but the harware colormap */
  83. blue >>= 8; /* registers are only 8 bits wide */
  84. hw_colorvalue = (blue << 16) + (green << 8) + (red);
  85. maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno,
  86. hw_colorvalue);
  87. return 0;
  88. }
  89. static struct fb_ops maxinefb_ops = {
  90. .owner = THIS_MODULE,
  91. .fb_setcolreg = maxinefb_setcolreg,
  92. .fb_fillrect = cfb_fillrect,
  93. .fb_copyarea = cfb_copyarea,
  94. .fb_imageblit = cfb_imageblit,
  95. };
  96. int __init maxinefb_init(void)
  97. {
  98. unsigned long fboff;
  99. unsigned long fb_start;
  100. int i;
  101. if (fb_get_options("maxinefb", NULL))
  102. return -ENODEV;
  103. /* Validate we're on the proper machine type */
  104. if (mips_machtype != MACH_DS5000_XX) {
  105. return -EINVAL;
  106. }
  107. printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
  108. printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
  109. /* Framebuffer display memory base address */
  110. fb_start = DS5000_xx_ONBOARD_FBMEM_START;
  111. /* Clear screen */
  112. for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
  113. *(volatile unsigned char *)fboff = 0x0;
  114. maxinefb_fix.smem_start = fb_start;
  115. /* erase hardware cursor */
  116. for (i = 0; i < 512; i++) {
  117. maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
  118. 0);
  119. /*
  120. if (i&0x8 == 0)
  121. maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
  122. else
  123. maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
  124. */
  125. }
  126. fb_info.fbops = &maxinefb_ops;
  127. fb_info.screen_base = (char *)maxinefb_fix.smem_start;
  128. fb_info.var = maxinefb_defined;
  129. fb_info.fix = maxinefb_fix;
  130. fb_info.flags = FBINFO_DEFAULT;
  131. fb_alloc_cmap(&fb_info.cmap, 256, 0);
  132. if (register_framebuffer(&fb_info) < 0)
  133. return 1;
  134. return 0;
  135. }
  136. static void __exit maxinefb_exit(void)
  137. {
  138. unregister_framebuffer(&fb_info);
  139. }
  140. #ifdef MODULE
  141. MODULE_LICENSE("GPL");
  142. #endif
  143. module_init(maxinefb_init);
  144. module_exit(maxinefb_exit);