linux/drivers/video/maxinefb.c
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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/*
  19 * Changes:
  20 * 2001/01/27 removed debugging and testing code, fixed fb_ops
  21 *            initialization which had caused a crash before,
  22 *            general cleanup, first official release (KM)
  23 *
  24 */
  25
  26#include <linux/module.h>
  27#include <linux/kernel.h>
  28#include <linux/errno.h>
  29#include <linux/string.h>
  30#include <linux/mm.h>
  31#include <linux/delay.h>
  32#include <linux/init.h>
  33#include <linux/fb.h>
  34#include <video/maxinefb.h>
  35
  36/* bootinfo.h defines the machine type values, needed when checking */
  37/* whether are really running on a maxine, KM                       */
  38#include <asm/bootinfo.h>
  39
  40static struct fb_info fb_info;
  41
  42static struct fb_var_screeninfo maxinefb_defined = {
  43        .xres =         1024,
  44        .yres =         768,
  45        .xres_virtual = 1024,
  46        .yres_virtual = 768,
  47        .bits_per_pixel =8,
  48        .activate =     FB_ACTIVATE_NOW,
  49        .height =       -1,
  50        .width =        -1,
  51        .vmode =        FB_VMODE_NONINTERLACED,
  52};
  53
  54static struct fb_fix_screeninfo maxinefb_fix = {
  55        .id =           "Maxine",
  56        .smem_len =     (1024*768),
  57        .type =         FB_TYPE_PACKED_PIXELS,
  58        .visual =       FB_VISUAL_PSEUDOCOLOR,
  59        .line_length =  1024,
  60};
  61
  62/* Handle the funny Inmos RamDAC/video controller ... */
  63
  64void maxinefb_ims332_write_register(int regno, register unsigned int val)
  65{
  66        register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
  67        unsigned char *wptr;
  68
  69        wptr = regs + 0xa0000 + (regno << 4);
  70        *((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;
  71        *((volatile unsigned short *) (wptr)) = val;
  72}
  73
  74unsigned int maxinefb_ims332_read_register(int regno)
  75{
  76        register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
  77        unsigned char *rptr;
  78        register unsigned int j, k;
  79
  80        rptr = regs + 0x80000 + (regno << 4);
  81        j = *((volatile unsigned short *) rptr);
  82        k = *((volatile unsigned short *) regs);
  83
  84        return (j & 0xffff) | ((k & 0xff00) << 8);
  85}
  86
  87/* Set the palette */
  88static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
  89                              unsigned blue, unsigned transp, struct fb_info *info)
  90{
  91        /* value to be written into the palette reg. */
  92        unsigned long hw_colorvalue = 0;
  93
  94        if (regno > 255)
  95                return 1;
  96
  97        red   >>= 8;    /* The cmap fields are 16 bits    */
  98        green >>= 8;    /* wide, but the harware colormap */
  99        blue  >>= 8;    /* registers are only 8 bits wide */
 100
 101        hw_colorvalue = (blue << 16) + (green << 8) + (red);
 102
 103        maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno,
 104                                       hw_colorvalue);
 105        return 0;
 106}
 107
 108static struct fb_ops maxinefb_ops = {
 109        .owner          = THIS_MODULE,
 110        .fb_setcolreg   = maxinefb_setcolreg,
 111        .fb_fillrect    = cfb_fillrect,
 112        .fb_copyarea    = cfb_copyarea,
 113        .fb_imageblit   = cfb_imageblit,
 114};
 115
 116int __init maxinefb_init(void)
 117{
 118        unsigned long fboff;
 119        unsigned long fb_start;
 120        int i;
 121
 122        if (fb_get_options("maxinefb", NULL))
 123                return -ENODEV;
 124
 125        /* Validate we're on the proper machine type */
 126        if (mips_machtype != MACH_DS5000_XX) {
 127                return -EINVAL;
 128        }
 129
 130        printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
 131        printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
 132
 133        /* Framebuffer display memory base address */
 134        fb_start = DS5000_xx_ONBOARD_FBMEM_START;
 135
 136        /* Clear screen */
 137        for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
 138                *(volatile unsigned char *)fboff = 0x0;
 139
 140        maxinefb_fix.smem_start = fb_start;
 141        
 142        /* erase hardware cursor */
 143        for (i = 0; i < 512; i++) {
 144                maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
 145                                               0);
 146                /*
 147                   if (i&0x8 == 0)
 148                   maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
 149                   else
 150                   maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
 151                 */
 152        }
 153
 154        fb_info.fbops = &maxinefb_ops;
 155        fb_info.screen_base = (char *)maxinefb_fix.smem_start;
 156        fb_info.var = maxinefb_defined;
 157        fb_info.fix = maxinefb_fix;
 158        fb_info.flags = FBINFO_DEFAULT;
 159
 160        fb_alloc_cmap(&fb_info.cmap, 256, 0);
 161
 162        if (register_framebuffer(&fb_info) < 0)
 163                return 1;
 164        return 0;
 165}
 166
 167static void __exit maxinefb_exit(void)
 168{
 169        unregister_framebuffer(&fb_info);
 170}
 171
 172#ifdef MODULE
 173MODULE_LICENSE("GPL");
 174#endif
 175module_init(maxinefb_init);
 176module_exit(maxinefb_exit);
 177
 178
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