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/sched.h>
  29 #include <linux/errno.h>
  30 #include <linux/string.h>
  31 #include <linux/mm.h>
  32 #include <linux/tty.h>
  33 #include <linux/slab.h>
  34 #include <linux/delay.h>
  35 #include <linux/init.h>
  36 #include <linux/fb.h>
  37 #include <video/maxinefb.h>
  38
  39 /* bootinfo.h defines the machine type values, needed when checking */
  40 /* whether are really running on a maxine, KM                       */
  41 #include <asm/bootinfo.h>
  42
  43 static struct fb_info fb_info;
  44
  45 static struct fb_var_screeninfo maxinefb_defined = {
  46         .xres =         1024,
  47         .yres =         768,
  48         .xres_virtual = 1024,
  49         .yres_virtual = 768,
  50         .bits_per_pixel =8,
  51         .activate =     FB_ACTIVATE_NOW,
  52         .height =       -1,
  53         .width =        -1,
  54         .vmode =        FB_VMODE_NONINTERLACED,
  55 };
  56
  57 static struct fb_fix_screeninfo maxinefb_fix = {
  58         .id =           "Maxine onboard graphics 1024x768x8",
  59         .smem_len =     (1024*768),
  60         .type =         FB_TYPE_PACKED_PIXELS,
  61         .visual =       FB_VISUAL_PSEUDOCOLOR,
  62         .line_length =  1024,
  63 };
  64
  65 /* Handle the funny Inmos RamDAC/video controller ... */
  66
  67 void maxinefb_ims332_write_register(int regno, register unsigned int val)
  68 {
  69         register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
  70         unsigned char *wptr;
  71
  72         wptr = regs + 0xa0000 + (regno << 4);
  73         *((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;
  74         *((volatile unsigned short *) (wptr)) = val;
  75 }
  76
  77 unsigned int maxinefb_ims332_read_register(int regno)
  78 {
  79         register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
  80         unsigned char *rptr;
  81         register unsigned int j, k;
  82
  83         rptr = regs + 0x80000 + (regno << 4);
  84         j = *((volatile unsigned short *) rptr);
  85         k = *((volatile unsigned short *) regs);
  86
  87         return (j & 0xffff) | ((k & 0xff00) << 8);
  88 }
  89
  90 /* Set the palette */
  91 static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
  92                               unsigned blue, unsigned transp, struct fb_info *info)
  93 {
  94         /* value to be written into the palette reg. */
  95         unsigned long hw_colorvalue = 0;
  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_get_fix     = gen_get_fix,
 111         .fb_get_var     = gen_get_var,
 112         .fb_setcolreg   = maxinefb_setcolreg,
 113         .fb_fillrect    = cfb_fillrect,
 114         .fb_copyarea    = cfb_copyarea,
 115         .fb_imageblit   = cfb_imageblit,
 116 };
 117
 118 int __init maxinefb_init(void)
 119 {
 120         unsigned long fboff;
 121         unsigned long fb_start;
 122         int i;
 123
 124         if (fb_get_options("maxinefb", NULL))
 125                 return -ENODEV;
 126
 127         /* Validate we're on the proper machine type */
 128         if (mips_machtype != MACH_DS5000_XX) {
 129                 return -EINVAL;
 130         }
 131
 132         printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
 133         printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
 134
 135         /* Framebuffer display memory base address */
 136         fb_start = DS5000_xx_ONBOARD_FBMEM_START;
 137
 138         /* Clear screen */
 139         for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
 140                 *(volatile unsigned char *)fboff = 0x0;
 141
 142         maxinefb_fix.smem_start = fb_start;
 143
 144         /* erase hardware cursor */
 145         for (i = 0; i < 512; i++) {
 146                 maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
 147                                                0);
 148                 /*
 149                    if (i&0x8 == 0)
 150                    maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
 151                    else
 152                    maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
 153                  */
 154         }
 155
 156         fb_info.fbops = &maxinefb_ops;
 157         fb_info.screen_base = (char *)maxinefb_fix.smem_start;
 158         fb_info.var = maxinefb_defined;
 159         fb_info.fix = maxinefb_fix;
 160         fb_info.flags = FBINFO_DEFAULT;
 161
 162         fb_alloc_cmap(&fb_info.cmap, 256, 0);
 163
 164         if (register_framebuffer(&fb_info) < 0)
 165                 return 1;
 166         return 0;
 167 }
 168
 169 static void __exit maxinefb_exit(void)
 170 {
 171         unregister_framebuffer(&fb_info);
 172 }
 173
 174 #ifdef MODULE
 175 MODULE_LICENSE("GPL");
 176 #endif
 177 module_init(maxinefb_init);
 178 module_exit(maxinefb_exit);
 179