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         .red.length     = 8,
  52         .green.length   = 8,
  53         .blue.length    = 8,
  54         .activate       = FB_ACTIVATE_NOW,
  55         .height         = -1,
  56         .width          = -1,
  57         .vmode          = FB_VMODE_NONINTERLACED,
  58 };
  59
  60 static struct fb_fix_screeninfo maxinefb_fix = {
  61         .id             = "Maxine onboard graphics 1024x768x8",
  62         .smem_len       = (1024*768),
  63         .type           = FB_TYPE_PACKED_PIXELS,
  64         .visual         = FB_VISUAL_PSEUDOCOLOR,
  65         .line_length    = 1024,
  66 };
  67
  68 /* Reference to machine type set in arch/mips/dec/prom/identify.c, KM */
  69 extern unsigned long mips_machtype;
  70
  71 /* Handle the funny Inmos RamDAC/video controller ... */
  72
  73 void maxinefb_ims332_write_register(int regno, register unsigned int val)
  74 {
  75         register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
  76         unsigned char *wptr;
  77
  78         wptr = regs + 0xa0000 + (regno << 4);
  79         *((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;
  80         *((volatile unsigned short *) (wptr)) = val;
  81 }
  82
  83 unsigned int maxinefb_ims332_read_register(int regno)
  84 {
  85         register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
  86         unsigned char *rptr;
  87         register unsigned int j, k;
  88
  89         rptr = regs + 0x80000 + (regno << 4);
  90         j = *((volatile unsigned short *) rptr);
  91         k = *((volatile unsigned short *) regs);
  92
  93         return (j & 0xffff) | ((k & 0xff00) << 8);
  94 }
  95
  96 /* Set the palette */
  97 static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
  98                               unsigned blue, unsigned transp, struct fb_info *info)
  99 {
 100         /* value to be written into the palette reg. */
 101         unsigned long hw_colorvalue = 0;
 102
 103         red   >>= 8;    /* The cmap fields are 16 bits    */
 104         green >>= 8;    /* wide, but the harware colormap */
 105         blue  >>= 8;    /* registers are only 8 bits wide */
 106
 107         hw_colorvalue = (blue << 16) + (green << 8) + (red);
 108
 109         maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno,
 110                                        hw_colorvalue);
 111         return 0;
 112 }
 113
 114 static struct fb_ops maxinefb_ops = {
 115         .owner          = THIS_MODULE,
 116         .fb_setcolreg   = maxinefb_setcolreg,
 117         .fb_fillrect    = cfb_fillrect,
 118         .fb_copyarea    = cfb_copyarea,
 119         .fb_imageblit   = cfb_imageblit,
 120         .fb_cursor      = soft_cursor,
 121 };
 122
 123 int __init maxinefb_init(void)
 124 {
 125         volatile unsigned char *fboff;
 126         unsigned long fb_start;
 127         int i;
 128
 129         if (fb_get_options("maxinefb", NULL))
 130                 return -ENODEV;
 131
 132         /* Validate we're on the proper machine type */
 133         if (mips_machtype != MACH_DS5000_XX) {
 134                 return -EINVAL;
 135         }
 136
 137         printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
 138         printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
 139
 140         /* Framebuffer display memory base address */
 141         fb_start = DS5000_xx_ONBOARD_FBMEM_START;
 142
 143         /* Clear screen */
 144         for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
 145                 *fboff = 0x0;
 146
 147         maxinefb_fix.smem_start = fb_start;
 148
 149         /* erase hardware cursor */
 150         for (i = 0; i < 512; i++) {
 151                 maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
 152                                                0);
 153                 /*
 154                    if (i&0x8 == 0)
 155                    maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
 156                    else
 157                    maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
 158                  */
 159         }
 160
 161         fb_info.fbops = &maxinefb_ops;
 162         fb_info.screen_base = (char *) maxinefb_fix.smem_start;
 163         fb_info.var = maxinefb_defined;
 164         fb_info.fix = maxinefb_fix;
 165         fb_info.flags = FBINFO_DEFAULT;
 166
 167         fb_alloc_cmap(&fb_info.cmap, 256, 0);
 168
 169         if (register_framebuffer(&fb_info) < 0)
 170                 return 1;
 171         return 0;
 172 }
 173
 174 static void __exit maxinefb_exit(void)
 175 {
 176         unregister_framebuffer(&fb_info);
 177 }
 178
 179 #ifdef MODULE
 180 MODULE_LICENSE("GPL");
 181 #endif
 182 module_init(maxinefb_init);
 183 module_exit(maxinefb_exit);
 184