drivers/video/imacfb.c

   1 /*
   2  * framebuffer driver for Intel Based Mac's
   3  *
   4  * (c) 2006 Edgar Hucek <gimli@dark-green.com>
   5  * Original imac driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
   6  *
   7  */
   8
   9 #include <linux/delay.h>
  10 #include <linux/errno.h>
  11 #include <linux/fb.h>
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/ioport.h>
  15 #include <linux/mm.h>
  16 #include <linux/module.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/slab.h>
  19 #include <linux/string.h>
  20 #include <linux/tty.h>
  21
  22 #include <asm/io.h>
  23
  24 #include <video/vga.h>
  25
  26 typedef enum _MAC_TYPE {
  27         M_I17,
  28         M_I20,
  29         M_MINI,
  30         M_MACBOOK,
  31         M_NEW
  32 } MAC_TYPE;
  33
  34 /* --------------------------------------------------------------------- */
  35
  36 static struct fb_var_screeninfo imacfb_defined __initdata = {
  37         .activate               = FB_ACTIVATE_NOW,
  38         .height                 = -1,
  39         .width                  = -1,
  40         .right_margin           = 32,
  41         .upper_margin           = 16,
  42         .lower_margin           = 4,
  43         .vsync_len              = 4,
  44         .vmode                  = FB_VMODE_NONINTERLACED,
  45 };
  46
  47 static struct fb_fix_screeninfo imacfb_fix __initdata = {
  48         .id                     = "IMAC VGA",
  49         .type                   = FB_TYPE_PACKED_PIXELS,
  50         .accel                  = FB_ACCEL_NONE,
  51         .visual                 = FB_VISUAL_TRUECOLOR,
  52 };
  53
  54 static int inverse;
  55 static int model                = M_NEW;
  56 static int manual_height;
  57 static int manual_width;
  58
  59 #define DEFAULT_FB_MEM  1024*1024*16
  60
  61 /* --------------------------------------------------------------------- */
  62
  63 static int imacfb_setcolreg(unsigned regno, unsigned red, unsigned green,
  64                             unsigned blue, unsigned transp,
  65                             struct fb_info *info)
  66 {
  67         /*
  68          *  Set a single color register. The values supplied are
  69          *  already rounded down to the hardware's capabilities
  70          *  (according to the entries in the `var' structure). Return
  71          *  != 0 for invalid regno.
  72          */
  73
  74         if (regno >= info->cmap.len)
  75                 return 1;
  76
  77         if (regno < 16) {
  78                 red   >>= 8;
  79                 green >>= 8;
  80                 blue  >>= 8;
  81                 ((u32 *)(info->pseudo_palette))[regno] =
  82                         (red   << info->var.red.offset)   |
  83                         (green << info->var.green.offset) |
  84                         (blue  << info->var.blue.offset);
  85         }
  86         return 0;
  87 }
  88
  89 static struct fb_ops imacfb_ops = {
  90         .owner          = THIS_MODULE,
  91         .fb_setcolreg   = imacfb_setcolreg,
  92         .fb_fillrect    = cfb_fillrect,
  93         .fb_copyarea    = cfb_copyarea,
  94         .fb_imageblit   = cfb_imageblit,
  95 };
  96
  97 static int __init imacfb_setup(char *options)
  98 {
  99         char *this_opt;
 100
 101         if (!options || !*options)
 102                 return 0;
 103
 104         while ((this_opt = strsep(&options, ",")) != NULL) {
 105                 if (!*this_opt) continue;
 106
 107                 if (!strcmp(this_opt, "inverse"))
 108                         inverse = 1;
 109                 else if (!strcmp(this_opt, "i17"))
 110                         model = M_I17;
 111                 else if (!strcmp(this_opt, "i20"))
 112                         model = M_I20;
 113                 else if (!strcmp(this_opt, "mini"))
 114                         model = M_MINI;
 115                 else if (!strcmp(this_opt, "macbook"))
 116                         model = M_MACBOOK;
 117                 else if (!strncmp(this_opt, "height:", 7))
 118                         manual_height = simple_strtoul(this_opt+7, NULL, 0);
 119                 else if (!strncmp(this_opt, "width:", 6))
 120                         manual_width = simple_strtoul(this_opt+6, NULL, 0);
 121         }
 122         return 0;
 123 }
 124
 125 static int __init imacfb_probe(struct platform_device *dev)
 126 {
 127         struct fb_info *info;
 128         int err;
 129         unsigned int size_vmode;
 130         unsigned int size_remap;
 131         unsigned int size_total;
 132
 133         screen_info.lfb_depth = 32;
 134         screen_info.lfb_size = DEFAULT_FB_MEM / 0x10000;
 135         screen_info.pages=1;
 136         screen_info.blue_size = 8;
 137         screen_info.blue_pos = 0;
 138         screen_info.green_size = 8;
 139         screen_info.green_pos = 8;
 140         screen_info.red_size = 8;
 141         screen_info.red_pos = 16;
 142         screen_info.rsvd_size = 8;
 143         screen_info.rsvd_pos = 24;
 144
 145         switch (model) {
 146         case M_I17:
 147                 screen_info.lfb_width = 1440;
 148                 screen_info.lfb_height = 900;
 149                 screen_info.lfb_linelength = 1472 * 4;
 150                 screen_info.lfb_base = 0x80010000;
 151                 break;
 152         case M_NEW:
 153         case M_I20:
 154                 screen_info.lfb_width = 1680;
 155                 screen_info.lfb_height = 1050;
 156                 screen_info.lfb_linelength = 1728 * 4;
 157                 screen_info.lfb_base = 0x80010000;
 158                 break;
 159         case M_MINI:
 160                 screen_info.lfb_width = 1024;
 161                 screen_info.lfb_height = 768;
 162                 screen_info.lfb_linelength = 2048 * 4;
 163                 screen_info.lfb_base = 0x80000000;
 164                 break;
 165         case M_MACBOOK:
 166                 screen_info.lfb_width = 1280;
 167                 screen_info.lfb_height = 800;
 168                 screen_info.lfb_linelength = 2048 * 4;
 169                 screen_info.lfb_base = 0x80000000;
 170                 break;
 171         }
 172
 173         /* if the user wants to manually specify height/width,
 174            we will override the defaults */
 175         /* TODO: eventually get auto-detection working */
 176         if (manual_height > 0)
 177                 screen_info.lfb_height = manual_height;
 178         if (manual_width > 0)
 179                 screen_info.lfb_width = manual_width;
 180
 181         imacfb_fix.smem_start = screen_info.lfb_base;
 182         imacfb_defined.bits_per_pixel = screen_info.lfb_depth;
 183         imacfb_defined.xres = screen_info.lfb_width;
 184         imacfb_defined.yres = screen_info.lfb_height;
 185         imacfb_fix.line_length = screen_info.lfb_linelength;
 186
 187         /*   size_vmode -- that is the amount of memory needed for the
 188          *                 used video mode, i.e. the minimum amount of
 189          *                 memory we need. */
 190         size_vmode = imacfb_defined.yres * imacfb_fix.line_length;
 191
 192         /*   size_total -- all video memory we have. Used for
 193          *                 entries, ressource allocation and bounds
 194          *                 checking. */
 195         size_total = screen_info.lfb_size * 65536;
 196         if (size_total < size_vmode)
 197                 size_total = size_vmode;
 198
 199         /*   size_remap -- the amount of video memory we are going to
 200          *                 use for imacfb.  With modern cards it is no
 201          *                 option to simply use size_total as that
 202          *                 wastes plenty of kernel address space. */
 203         size_remap  = size_vmode * 2;
 204         if (size_remap < size_vmode)
 205                 size_remap = size_vmode;
 206         if (size_remap > size_total)
 207                 size_remap = size_total;
 208         imacfb_fix.smem_len = size_remap;
 209
 210         if (!request_mem_region(imacfb_fix.smem_start, size_total, "imacfb")) {
 211                 printk(KERN_WARNING
 212                        "imacfb: cannot reserve video memory at 0x%lx\n",
 213                         imacfb_fix.smem_start);
 214                 /* We cannot make this fatal. Sometimes this comes from magic
 215                    spaces our resource handlers simply don't know about */
 216         }
 217
 218         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 219         if (!info) {
 220                 err = -ENOMEM;
 221                 goto err_release_mem;
 222         }
 223         info->pseudo_palette = info->par;
 224         info->par = NULL;
 225
 226         info->screen_base = ioremap(imacfb_fix.smem_start, imacfb_fix.smem_len);
 227         if (!info->screen_base) {
 228                 printk(KERN_ERR "imacfb: abort, cannot ioremap video memory "
 229                                 "0x%x @ 0x%lx\n",
 230                         imacfb_fix.smem_len, imacfb_fix.smem_start);
 231                 err = -EIO;
 232                 goto err_unmap;
 233         }
 234
 235         printk(KERN_INFO "imacfb: framebuffer at 0x%lx, mapped to 0x%p, "
 236                "using %dk, total %dk\n",
 237                imacfb_fix.smem_start, info->screen_base,
 238                size_remap/1024, size_total/1024);
 239         printk(KERN_INFO "imacfb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 240                imacfb_defined.xres, imacfb_defined.yres,
 241                imacfb_defined.bits_per_pixel, imacfb_fix.line_length,
 242                screen_info.pages);
 243
 244         imacfb_defined.xres_virtual = imacfb_defined.xres;
 245         imacfb_defined.yres_virtual = imacfb_fix.smem_len /
 246                                         imacfb_fix.line_length;
 247         printk(KERN_INFO "imacfb: scrolling: redraw\n");
 248         imacfb_defined.yres_virtual = imacfb_defined.yres;
 249
 250         /* some dummy values for timing to make fbset happy */
 251         imacfb_defined.pixclock     = 10000000 / imacfb_defined.xres *
 252                                         1000 / imacfb_defined.yres;
 253         imacfb_defined.left_margin  = (imacfb_defined.xres / 8) & 0xf8;
 254         imacfb_defined.hsync_len    = (imacfb_defined.xres / 8) & 0xf8;
 255
 256         imacfb_defined.red.offset    = screen_info.red_pos;
 257         imacfb_defined.red.length    = screen_info.red_size;
 258         imacfb_defined.green.offset  = screen_info.green_pos;
 259         imacfb_defined.green.length  = screen_info.green_size;
 260         imacfb_defined.blue.offset   = screen_info.blue_pos;
 261         imacfb_defined.blue.length   = screen_info.blue_size;
 262         imacfb_defined.transp.offset = screen_info.rsvd_pos;
 263         imacfb_defined.transp.length = screen_info.rsvd_size;
 264
 265         printk(KERN_INFO "imacfb: %s: "
 266                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 267                "Truecolor",
 268                screen_info.rsvd_size,
 269                screen_info.red_size,
 270                screen_info.green_size,
 271                screen_info.blue_size,
 272                screen_info.rsvd_pos,
 273                screen_info.red_pos,
 274                screen_info.green_pos,
 275                screen_info.blue_pos);
 276
 277         imacfb_fix.ypanstep  = 0;
 278         imacfb_fix.ywrapstep = 0;
 279
 280         /* request failure does not faze us, as vgacon probably has this
 281          * region already (FIXME) */
 282         request_region(0x3c0, 32, "imacfb");
 283
 284         info->fbops = &imacfb_ops;
 285         info->var = imacfb_defined;
 286         info->fix = imacfb_fix;
 287         info->flags = FBINFO_FLAG_DEFAULT;
 288
 289         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 290                 err = -ENOMEM;
 291                 goto err_unmap;
 292         }
 293         if (register_framebuffer(info)<0) {
 294                 err = -EINVAL;
 295                 goto err_fb_dealoc;
 296         }
 297         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 298                info->node, info->fix.id);
 299         return 0;
 300
 301 err_fb_dealoc:
 302         fb_dealloc_cmap(&info->cmap);
 303 err_unmap:
 304         iounmap(info->screen_base);
 305         framebuffer_release(info);
 306 err_release_mem:
 307         release_mem_region(imacfb_fix.smem_start, size_total);
 308         return err;
 309 }
 310
 311 static struct platform_driver imacfb_driver = {
 312         .probe  = imacfb_probe,
 313         .driver = {
 314                 .name   = "imacfb",
 315         },
 316 };
 317
 318 static struct platform_device imacfb_device = {
 319         .name   = "imacfb",
 320 };
 321
 322 static int __init imacfb_init(void)
 323 {
 324         int ret;
 325         char *option = NULL;
 326
 327         /* ignore error return of fb_get_options */
 328         fb_get_options("imacfb", &option);
 329         imacfb_setup(option);
 330         ret = platform_driver_register(&imacfb_driver);
 331
 332         if (!ret) {
 333                 ret = platform_device_register(&imacfb_device);
 334                 if (ret)
 335                         platform_driver_unregister(&imacfb_driver);
 336         }
 337         return ret;
 338 }
 339 module_init(imacfb_init);
 340
 341 MODULE_LICENSE("GPL");