drivers/video/maxinefb.c

   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
  40 static struct fb_info fb_info;
  41
  42 static 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
  54 static 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
  64 void 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
  74 unsigned 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 */
  88 static 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
 108 static 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
 116 int __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
 167 static void __exit maxinefb_exit(void)
 168 {
 169         unregister_framebuffer(&fb_info);
 170 }
 171
 172 #ifdef MODULE
 173 MODULE_LICENSE("GPL");
 174 #endif
 175 module_init(maxinefb_init);
 176 module_exit(maxinefb_exit);
 177