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/screen_info.h>
  19 #include <linux/slab.h>
  20 #include <linux/string.h>
  21 #include <linux/dmi.h>
  22 #include <linux/efi.h>
  23
  24 #include <asm/io.h>
  25
  26 #include <video/vga.h>
  27
  28 typedef enum _MAC_TYPE {
  29         M_I17,
  30         M_I20,
  31         M_MINI,
  32         M_MACBOOK,
  33         M_UNKNOWN
  34 } MAC_TYPE;
  35
  36 /* --------------------------------------------------------------------- */
  37
  38 static struct fb_var_screeninfo imacfb_defined __initdata = {
  39         .activate               = FB_ACTIVATE_NOW,
  40         .height                 = -1,
  41         .width                  = -1,
  42         .right_margin           = 32,
  43         .upper_margin           = 16,
  44         .lower_margin           = 4,
  45         .vsync_len              = 4,
  46         .vmode                  = FB_VMODE_NONINTERLACED,
  47 };
  48
  49 static struct fb_fix_screeninfo imacfb_fix __initdata = {
  50         .id                     = "IMAC VGA",
  51         .type                   = FB_TYPE_PACKED_PIXELS,
  52         .accel                  = FB_ACCEL_NONE,
  53         .visual                 = FB_VISUAL_TRUECOLOR,
  54 };
  55
  56 static int inverse;
  57 static int model                = M_UNKNOWN;
  58 static int manual_height;
  59 static int manual_width;
  60
  61 static int set_system(struct dmi_system_id *id)
  62 {
  63         printk(KERN_INFO "imacfb: %s detected - set system to %ld\n",
  64                 id->ident, (long)id->driver_data);
  65
  66         model = (long)id->driver_data;
  67
  68         return 0;
  69 }
  70
  71 static struct dmi_system_id __initdata dmi_system_table[] = {
  72         { set_system, "iMac4,1", {
  73           DMI_MATCH(DMI_BIOS_VENDOR,"Apple Computer, Inc."),
  74           DMI_MATCH(DMI_PRODUCT_NAME,"iMac4,1") }, (void*)M_I17},
  75         { set_system, "MacBookPro1,1", {
  76           DMI_MATCH(DMI_BIOS_VENDOR,"Apple Computer, Inc."),
  77           DMI_MATCH(DMI_PRODUCT_NAME,"MacBookPro1,1") }, (void*)M_I17},
  78         { set_system, "MacBook1,1", {
  79           DMI_MATCH(DMI_BIOS_VENDOR,"Apple Computer, Inc."),
  80           DMI_MATCH(DMI_PRODUCT_NAME,"MacBook1,1")}, (void *)M_MACBOOK},
  81         { set_system, "Macmini1,1", {
  82           DMI_MATCH(DMI_BIOS_VENDOR,"Apple Computer, Inc."),
  83           DMI_MATCH(DMI_PRODUCT_NAME,"Macmini1,1")}, (void *)M_MINI},
  84         {},
  85 };
  86
  87 #define DEFAULT_FB_MEM  1024*1024*16
  88
  89 /* --------------------------------------------------------------------- */
  90
  91 static int imacfb_setcolreg(unsigned regno, unsigned red, unsigned green,
  92                             unsigned blue, unsigned transp,
  93                             struct fb_info *info)
  94 {
  95         /*
  96          *  Set a single color register. The values supplied are
  97          *  already rounded down to the hardware's capabilities
  98          *  (according to the entries in the `var' structure). Return
  99          *  != 0 for invalid regno.
 100          */
 101
 102         if (regno >= info->cmap.len)
 103                 return 1;
 104
 105         if (regno < 16) {
 106                 red   >>= 8;
 107                 green >>= 8;
 108                 blue  >>= 8;
 109                 ((u32 *)(info->pseudo_palette))[regno] =
 110                         (red   << info->var.red.offset)   |
 111                         (green << info->var.green.offset) |
 112                         (blue  << info->var.blue.offset);
 113         }
 114         return 0;
 115 }
 116
 117 static struct fb_ops imacfb_ops = {
 118         .owner          = THIS_MODULE,
 119         .fb_setcolreg   = imacfb_setcolreg,
 120         .fb_fillrect    = cfb_fillrect,
 121         .fb_copyarea    = cfb_copyarea,
 122         .fb_imageblit   = cfb_imageblit,
 123 };
 124
 125 static int __init imacfb_setup(char *options)
 126 {
 127         char *this_opt;
 128
 129         if (!options || !*options)
 130                 return 0;
 131
 132         while ((this_opt = strsep(&options, ",")) != NULL) {
 133                 if (!*this_opt) continue;
 134
 135                 if (!strcmp(this_opt, "inverse"))
 136                         inverse = 1;
 137                 else if (!strcmp(this_opt, "i17"))
 138                         model = M_I17;
 139                 else if (!strcmp(this_opt, "i20"))
 140                         model = M_I20;
 141                 else if (!strcmp(this_opt, "mini"))
 142                         model = M_MINI;
 143                 else if (!strcmp(this_opt, "macbook"))
 144                         model = M_MACBOOK;
 145                 else if (!strncmp(this_opt, "height:", 7))
 146                         manual_height = simple_strtoul(this_opt+7, NULL, 0);
 147                 else if (!strncmp(this_opt, "width:", 6))
 148                         manual_width = simple_strtoul(this_opt+6, NULL, 0);
 149         }
 150         return 0;
 151 }
 152
 153 static int __init imacfb_probe(struct platform_device *dev)
 154 {
 155         struct fb_info *info;
 156         int err;
 157         unsigned int size_vmode;
 158         unsigned int size_remap;
 159         unsigned int size_total;
 160
 161         screen_info.lfb_depth = 32;
 162         screen_info.lfb_size = DEFAULT_FB_MEM / 0x10000;
 163         screen_info.pages=1;
 164         screen_info.blue_size = 8;
 165         screen_info.blue_pos = 0;
 166         screen_info.green_size = 8;
 167         screen_info.green_pos = 8;
 168         screen_info.red_size = 8;
 169         screen_info.red_pos = 16;
 170         screen_info.rsvd_size = 8;
 171         screen_info.rsvd_pos = 24;
 172
 173         switch (model) {
 174         case M_I17:
 175                 screen_info.lfb_width = 1440;
 176                 screen_info.lfb_height = 900;
 177                 screen_info.lfb_linelength = 1472 * 4;
 178                 screen_info.lfb_base = 0x80010000;
 179                 break;
 180         case M_I20:
 181                 screen_info.lfb_width = 1680;
 182                 screen_info.lfb_height = 1050;
 183                 screen_info.lfb_linelength = 1728 * 4;
 184                 screen_info.lfb_base = 0x80010000;
 185                 break;
 186         case M_MINI:
 187                 screen_info.lfb_width = 1024;
 188                 screen_info.lfb_height = 768;
 189                 screen_info.lfb_linelength = 2048 * 4;
 190                 screen_info.lfb_base = 0x80000000;
 191                 break;
 192         case M_MACBOOK:
 193                 screen_info.lfb_width = 1280;
 194                 screen_info.lfb_height = 800;
 195                 screen_info.lfb_linelength = 2048 * 4;
 196                 screen_info.lfb_base = 0x80000000;
 197                 break;
 198         }
 199
 200         /* if the user wants to manually specify height/width,
 201            we will override the defaults */
 202         /* TODO: eventually get auto-detection working */
 203         if (manual_height > 0)
 204                 screen_info.lfb_height = manual_height;
 205         if (manual_width > 0)
 206                 screen_info.lfb_width = manual_width;
 207
 208         imacfb_fix.smem_start = screen_info.lfb_base;
 209         imacfb_defined.bits_per_pixel = screen_info.lfb_depth;
 210         imacfb_defined.xres = screen_info.lfb_width;
 211         imacfb_defined.yres = screen_info.lfb_height;
 212         imacfb_fix.line_length = screen_info.lfb_linelength;
 213
 214         /*   size_vmode -- that is the amount of memory needed for the
 215          *                 used video mode, i.e. the minimum amount of
 216          *                 memory we need. */
 217         size_vmode = imacfb_defined.yres * imacfb_fix.line_length;
 218
 219         /*   size_total -- all video memory we have. Used for
 220          *                 entries, ressource allocation and bounds
 221          *                 checking. */
 222         size_total = screen_info.lfb_size * 65536;
 223         if (size_total < size_vmode)
 224                 size_total = size_vmode;
 225
 226         /*   size_remap -- the amount of video memory we are going to
 227          *                 use for imacfb.  With modern cards it is no
 228          *                 option to simply use size_total as that
 229          *                 wastes plenty of kernel address space. */
 230         size_remap  = size_vmode * 2;
 231         if (size_remap < size_vmode)
 232                 size_remap = size_vmode;
 233         if (size_remap > size_total)
 234                 size_remap = size_total;
 235         imacfb_fix.smem_len = size_remap;
 236
 237 #ifndef __i386__
 238         screen_info.imacpm_seg = 0;
 239 #endif
 240
 241         if (!request_mem_region(imacfb_fix.smem_start, size_total, "imacfb")) {
 242                 printk(KERN_WARNING
 243                        "imacfb: cannot reserve video memory at 0x%lx\n",
 244                         imacfb_fix.smem_start);
 245                 /* We cannot make this fatal. Sometimes this comes from magic
 246                    spaces our resource handlers simply don't know about */
 247         }
 248
 249         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 250         if (!info) {
 251                 err = -ENOMEM;
 252                 goto err_release_mem;
 253         }
 254         info->pseudo_palette = info->par;
 255         info->par = NULL;
 256
 257         info->screen_base = ioremap(imacfb_fix.smem_start, imacfb_fix.smem_len);
 258         if (!info->screen_base) {
 259                 printk(KERN_ERR "imacfb: abort, cannot ioremap video memory "
 260                                 "0x%x @ 0x%lx\n",
 261                         imacfb_fix.smem_len, imacfb_fix.smem_start);
 262                 err = -EIO;
 263                 goto err_unmap;
 264         }
 265
 266         printk(KERN_INFO "imacfb: framebuffer at 0x%lx, mapped to 0x%p, "
 267                "using %dk, total %dk\n",
 268                imacfb_fix.smem_start, info->screen_base,
 269                size_remap/1024, size_total/1024);
 270         printk(KERN_INFO "imacfb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 271                imacfb_defined.xres, imacfb_defined.yres,
 272                imacfb_defined.bits_per_pixel, imacfb_fix.line_length,
 273                screen_info.pages);
 274
 275         imacfb_defined.xres_virtual = imacfb_defined.xres;
 276         imacfb_defined.yres_virtual = imacfb_fix.smem_len /
 277                                         imacfb_fix.line_length;
 278         printk(KERN_INFO "imacfb: scrolling: redraw\n");
 279         imacfb_defined.yres_virtual = imacfb_defined.yres;
 280
 281         /* some dummy values for timing to make fbset happy */
 282         imacfb_defined.pixclock     = 10000000 / imacfb_defined.xres *
 283                                         1000 / imacfb_defined.yres;
 284         imacfb_defined.left_margin  = (imacfb_defined.xres / 8) & 0xf8;
 285         imacfb_defined.hsync_len    = (imacfb_defined.xres / 8) & 0xf8;
 286
 287         imacfb_defined.red.offset    = screen_info.red_pos;
 288         imacfb_defined.red.length    = screen_info.red_size;
 289         imacfb_defined.green.offset  = screen_info.green_pos;
 290         imacfb_defined.green.length  = screen_info.green_size;
 291         imacfb_defined.blue.offset   = screen_info.blue_pos;
 292         imacfb_defined.blue.length   = screen_info.blue_size;
 293         imacfb_defined.transp.offset = screen_info.rsvd_pos;
 294         imacfb_defined.transp.length = screen_info.rsvd_size;
 295
 296         printk(KERN_INFO "imacfb: %s: "
 297                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 298                "Truecolor",
 299                screen_info.rsvd_size,
 300                screen_info.red_size,
 301                screen_info.green_size,
 302                screen_info.blue_size,
 303                screen_info.rsvd_pos,
 304                screen_info.red_pos,
 305                screen_info.green_pos,
 306                screen_info.blue_pos);
 307
 308         imacfb_fix.ypanstep  = 0;
 309         imacfb_fix.ywrapstep = 0;
 310
 311         /* request failure does not faze us, as vgacon probably has this
 312          * region already (FIXME) */
 313         request_region(0x3c0, 32, "imacfb");
 314
 315         info->fbops = &imacfb_ops;
 316         info->var = imacfb_defined;
 317         info->fix = imacfb_fix;
 318         info->flags = FBINFO_FLAG_DEFAULT;
 319
 320         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 321                 err = -ENOMEM;
 322                 goto err_unmap;
 323         }
 324         if (register_framebuffer(info)<0) {
 325                 err = -EINVAL;
 326                 goto err_fb_dealoc;
 327         }
 328         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 329                info->node, info->fix.id);
 330         return 0;
 331
 332 err_fb_dealoc:
 333         fb_dealloc_cmap(&info->cmap);
 334 err_unmap:
 335         iounmap(info->screen_base);
 336         framebuffer_release(info);
 337 err_release_mem:
 338         release_mem_region(imacfb_fix.smem_start, size_total);
 339         return err;
 340 }
 341
 342 static struct platform_driver imacfb_driver = {
 343         .probe  = imacfb_probe,
 344         .driver = {
 345                 .name   = "imacfb",
 346         },
 347 };
 348
 349 static struct platform_device imacfb_device = {
 350         .name   = "imacfb",
 351 };
 352
 353 static int __init imacfb_init(void)
 354 {
 355         int ret;
 356         char *option = NULL;
 357
 358         if (!efi_enabled)
 359                 return -ENODEV;
 360         if (!dmi_check_system(dmi_system_table))
 361                 return -ENODEV;
 362         if (model == M_UNKNOWN)
 363                 return -ENODEV;
 364
 365         if (fb_get_options("imacfb", &option))
 366                 return -ENODEV;
 367
 368         imacfb_setup(option);
 369         ret = platform_driver_register(&imacfb_driver);
 370
 371         if (!ret) {
 372                 ret = platform_device_register(&imacfb_device);
 373                 if (ret)
 374                         platform_driver_unregister(&imacfb_driver);
 375         }
 376         return ret;
 377 }
 378 module_init(imacfb_init);
 379
 380 MODULE_LICENSE("GPL");