drivers/video/pmag-ba-fb.c

   1 /*
   2  *      linux/drivers/video/pmag-ba-fb.c
   3  *
   4  *      PMAG-BA 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  *      Based on digital document:
  10  *      "PMAG-BA TURBOchannel Color Frame Buffer
  11  *       Functional Specification", Revision 1.2, August 27, 1990
  12  *
  13  *      DECstation related code Copyright (C) 1999, 2000, 2001 by
  14  *      Michael Engel <engel@unix-ag.org>,
  15  *      Karsten Merker <merker@linuxtag.org> and
  16  *      Harald Koerfgen.
  17  *      This file is subject to the terms and conditions of the GNU General
  18  *      Public License.  See the file COPYING in the main directory of this
  19  *      archive for more details.
  20  *
  21  */
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/sched.h>
  25 #include <linux/errno.h>
  26 #include <linux/string.h>
  27 #include <linux/timer.h>
  28 #include <linux/mm.h>
  29 #include <linux/tty.h>
  30 #include <linux/slab.h>
  31 #include <linux/delay.h>
  32 #include <linux/init.h>
  33 #include <linux/fb.h>
  34 #include <asm/bootinfo.h>
  35 #include <asm/dec/machtype.h>
  36 #include <asm/dec/tc.h>
  37 #include <video/pmag-ba-fb.h>
  38
  39 struct pmag_ba_ramdac_regs {
  40         unsigned char addr_low;
  41         unsigned char pad0[3];
  42         unsigned char addr_hi;
  43         unsigned char pad1[3];
  44         unsigned char data;
  45         unsigned char pad2[3];
  46         unsigned char cmap;
  47 };
  48
  49 /*
  50  * Max 3 TURBOchannel slots -> max 3 PMAG-BA :)
  51  */
  52 static struct fb_info pmagba_fb_info[3];
  53
  54 static struct fb_var_screeninfo pmagbafb_defined = {
  55         .xres           = 1024,
  56         .yres           = 864,
  57         .xres_virtual   = 1024,
  58         .yres_virtual   = 864,
  59         .bits_per_pixel = 8,
  60         .red.length     = 8,
  61         .green.length   = 8,
  62         .blue.length    = 8,
  63         .activate       = FB_ACTIVATE_NOW,
  64         .height         = 274,
  65         .width          = 195,
  66         .accel          = FB_ACCEL_NONE,
  67         .vmode          = FB_VMODE_NONINTERLACED,
  68 };
  69
  70 static struct fb_fix_screeninfo pmagbafb_fix = {
  71         .id             = "PMAG-BA",
  72         .smem_len       = (1024 * 864),
  73         .type           = FB_TYPE_PACKED_PIXELS,
  74         .visual         = FB_VISUAL_PSEUDOCOLOR,
  75         .line_length    = 1024,
  76 };
  77
  78 /*
  79  * Turn hardware cursor off
  80  */
  81 void pmagbafb_erase_cursor(struct pmag_ba_ramdac_regs *bt459_regs)
  82 {
  83         bt459_regs->addr_low = 0;
  84         bt459_regs->addr_hi = 3;
  85         bt459_regs->data = 0;
  86 }
  87
  88 /*
  89  * Set the palette.
  90  */
  91 static int pmagbafb_setcolreg(unsigned regno, unsigned red, unsigned green,
  92                               unsigned blue, unsigned transp,
  93                               struct fb_info *info)
  94 {
  95         struct pmag_ba_ramdac_regs *bt459_regs = (struct pmag_ba_ramdac_regs *) info->par;
  96
  97         if (regno >= info->cmap.len)
  98                 return 1;
  99
 100         red   >>= 8;    /* The cmap fields are 16 bits    */
 101         green >>= 8;    /* wide, but the harware colormap */
 102         blue  >>= 8;    /* registers are only 8 bits wide */
 103
 104         bt459_regs->addr_low = (__u8) regno;
 105         bt459_regs->addr_hi = 0;
 106         bt459_regs->cmap = red;
 107         bt459_regs->cmap = green;
 108         bt459_regs->cmap = blue;
 109         return 0;
 110 }
 111
 112 static struct fb_ops pmagbafb_ops = {
 113         .owner          = THIS_MODULE,
 114         .fb_get_fix     = gen_get_fix,
 115         .fb_get_var     = gen_get_var,
 116         .fb_setcolreg   = pmagbafb_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 pmagbafb_init_one(int slot)
 124 {
 125         unsigned long base_addr = get_tc_base_addr(slot);
 126         struct fb_info *info = &pmagba_fb_info[slot];
 127         struct display *disp = &pmagba_disp[slot];
 128
 129         printk("PMAG-BA framebuffer in slot %d\n", slot);
 130         /*
 131          * Framebuffer display memory base address and friends
 132          */
 133         pmagbafb_fix.smem_start = base_addr + PMAG_BA_ONBOARD_FBMEM_OFFSET;
 134         info->par = (base_addr + PMAG_BA_BT459_OFFSET);
 135
 136         /*
 137          * Configure the Bt459 RAM DAC
 138          */
 139         pmagbafb_erase_cursor((struct pmag_ba_ramdac_regs *) info->par);
 140
 141         /*
 142          *      Let there be consoles..
 143          */
 144         info->fbops = &pmagbafb_ops;
 145         info->var = pmagbafb_defined;
 146         info->fix = pmagbafb_fix;
 147         info->screen_base = pmagbafb_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 pmagbafb_init(void)
 162 {
 163         int sid;
 164         int found = 0;
 165
 166         if (fb_get_options("pmagbafb", NULL))
 167                 return -ENODEV;
 168
 169         if (TURBOCHANNEL) {
 170                 while ((sid = search_tc_card("PMAG-BA")) >= 0) {
 171                         found = 1;
 172                         claim_tc_card(sid);
 173                         pmagbafb_init_one(sid);
 174                 }
 175                 return found ? 0 : -ENODEV;
 176         } else {
 177                 return -ENODEV;
 178         }
 179 }
 180
 181 module_init(pmagbafb_init);
 182 MODULE_LICENSE("GPL");