drivers/video/pmagb-b-fb.c

   1 /*
   2  *      linux/drivers/video/pmagb-b-fb.c
   3  *
   4  *      PMAGB-B TurboChannel framebuffer card 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>,
  11  *      Karsten Merker <merker@linuxtag.org> and
  12  *      Harald Koerfgen.
  13  *      This file is subject to the terms and conditions of the GNU General
  14  *      Public License.  See the file COPYING in the main directory of this
  15  *      archive for more details.
  16  *
  17  */
  18
  19 /*
  20  *      We currently only support the PMAGB-B in high resolution mode
  21  *      as I know of no way to detect low resolution mode set via jumper.
  22  *      KM, 2001/01/07
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27 #include <linux/sched.h>
  28 #include <linux/errno.h>
  29 #include <linux/string.h>
  30 #include <linux/timer.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 <asm/bootinfo.h>
  38 #include <asm/dec/machtype.h>
  39 #include <asm/dec/tc.h>
  40 #include <video/pmagb-b-fb.h>
  41
  42 struct pmagb_b_ramdac_regs {
  43         unsigned char addr_low;
  44         unsigned char pad0[3];
  45         unsigned char addr_hi;
  46         unsigned char pad1[3];
  47         unsigned char data;
  48         unsigned char pad2[3];
  49         unsigned char cmap;
  50 };
  51
  52 /*
  53  * Max 3 TURBOchannel slots -> max 3 PMAGB-B :)
  54  */
  55 static struct fb_info pmagbb_fb_info[3];
  56
  57 static struct fb_var_screeninfo pmagbbfb_defined = {
  58         .xres           = 1280,
  59         .yres           = 1024,
  60         .xres_virtual   = 1280,
  61         .yres_virtual   = 1024,
  62         .bits_per_pixel = 8,
  63         .red.length     = 8,
  64         .green.length   = 8,
  65         .blue.length    = 8,
  66         .activate       = FB_ACTIVATE_NOW,
  67         .height         = 274,
  68         .width          = 195,
  69         .accel_flags    = FB_ACCEL_NONE,
  70         .vmode          = FB_VMODE_NONINTERLACED,
  71 };
  72
  73 static struct fb_fix_screeninfo pmagbafb_fix = {
  74         .id             = "PMAGB-BA",
  75         .smem_len       = (1280 * 1024),
  76         .type           = FB_TYPE_PACKED_PIXELS,
  77         .visual         = FB_VISUAL_PSEUDOCOLOR,
  78         .line_length    = 1280,
  79 }
  80
  81 /*
  82  * Turn hardware cursor off
  83  */
  84 void pmagbbfb_erase_cursor(struct pmagb_b_ramdac_regs *bt459_regs)
  85 {
  86         bt459_regs->addr_low = 0;
  87         bt459_regs->addr_hi = 3;
  88         bt459_regs->data = 0;
  89 }
  90
  91 /*
  92  * Set the palette.
  93  */
  94 static int pmagbbfb_setcolreg(unsigned regno, unsigned red, unsigned green,
  95                               unsigned blue, unsigned transp,
  96                               struct fb_info *info)
  97 {
  98         struct pmagb_b_ramdac_regs *bt459_regs = (struct pmagb_b_ramdac_regs *) info->par;
  99
 100         if (regno >= info->cmap.len)
 101                 return 1;
 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         bt459_regs->addr_low = (__u8) regno;
 108         bt459_regs->addr_hi = 0;
 109         bt459_regs->cmap = red;
 110         bt459_regs->cmap = green;
 111         bt459_regs->cmap = blue;
 112         return 0;
 113 }
 114
 115 static struct fb_ops pmagbbfb_ops = {
 116         .owner          = THIS_MODULE,
 117         .fb_setcolreg   = pmagbbfb_setcolreg,
 118         .fb_fillrect    = cfb_fillrect,
 119         .fb_copyarea    = cfb_copyarea,
 120         .fb_imageblit   = cfb_imageblit,
 121         .fb_cursor      = soft_cursor,
 122 };
 123
 124 int __init pmagbbfb_init_one(int slot)
 125 {
 126         unsigned long base_addr = get_tc_base_addr(slot);
 127         struct fb_info *info = &pmagbb_fb_info[slot];
 128
 129         printk("PMAGB-BA framebuffer in slot %d\n", slot);
 130         /*
 131          * Framebuffer display memory base address and friends
 132          */
 133         pmagbbfb_fix.smem_start = base_addr + PMAGB_B_ONBOARD_FBMEM_OFFSET;
 134         info->par = (base_addr + PMAGB_B_BT459_OFFSET);
 135
 136         /*
 137          * Configure the Bt459 RAM DAC
 138          */
 139         pmagbbfb_erase_cursor((struct pmagb_b_ramdac_regs *) info->par);
 140
 141         /*
 142          *      Let there be consoles..
 143          */
 144         info->fbops = &pmagbbfb_ops;
 145         info->var = pmagbbfb_defined;
 146         info->fix = pmagbbfb_fix;
 147         info->screen_base = pmagbbfb_fix.smem_start;
 148         info->flags = FBINFO_DEFAULT;
 149
 150         fb_alloc_cmap(&fb_info.cmap, 256, 0);
 151
 152         if (register_framebuffer(info) < 0)
 153                 return 1;
 154         return 0;
 155 }
 156
 157 /*
 158  * Initialise the framebuffer
 159  */
 160
 161 int __init pmagbbfb_init(void)
 162 {
 163         int sid;
 164         int found = 0;
 165
 166         if (fb_get_options("pmagbbfb", NULL))
 167                 return -ENODEV;
 168
 169         if (TURBOCHANNEL) {
 170                 while ((sid = search_tc_card("PMAGB-BA")) >= 0) {
 171                         found = 1;
 172                         claim_tc_card(sid);
 173                         pmagbbfb_init_one(sid);
 174                 }
 175                 return found ? 0 : -ENODEV;
 176         } else {
 177                 return -ENODEV;
 178         }
 179 }
 180
 181 module_init(pmagbbfb_init);
 182 MODULE_LICENSE("GPL");