drivers/video/ep93xx-fb.c

   1 /*
   2  * linux/drivers/video/ep93xx-fb.c
   3  *
   4  * Framebuffer support for the EP93xx series.
   5  *
   6  * Copyright (C) 2007 Bluewater Systems Ltd
   7  * Author: Ryan Mallon <ryan@bluewatersys.com>
   8  *
   9  * Copyright (c) 2009 H Hartley Sweeten <hsweeten@visionengravers.com>
  10  *
  11  * Based on the Cirrus Logic ep93xxfb driver, and various other ep93xxfb
  12  * drivers.
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  *
  18  */
  19
  20 #include <linux/platform_device.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/slab.h>
  23 #include <linux/clk.h>
  24 #include <linux/fb.h>
  25
  26 #include <mach/fb.h>
  27
  28 /* Vertical Frame Timing Registers */
  29 #define EP93XXFB_VLINES_TOTAL                   0x0000  /* SW locked */
  30 #define EP93XXFB_VSYNC                          0x0004  /* SW locked */
  31 #define EP93XXFB_VACTIVE                        0x0008  /* SW locked */
  32 #define EP93XXFB_VBLANK                         0x0228  /* SW locked */
  33 #define EP93XXFB_VCLK                           0x000c  /* SW locked */
  34
  35 /* Horizontal Frame Timing Registers */
  36 #define EP93XXFB_HCLKS_TOTAL                    0x0010  /* SW locked */
  37 #define EP93XXFB_HSYNC                          0x0014  /* SW locked */
  38 #define EP93XXFB_HACTIVE                        0x0018  /* SW locked */
  39 #define EP93XXFB_HBLANK                         0x022c  /* SW locked */
  40 #define EP93XXFB_HCLK                           0x001c  /* SW locked */
  41
  42 /* Frame Buffer Memory Configuration Registers */
  43 #define EP93XXFB_SCREEN_PAGE                    0x0028
  44 #define EP93XXFB_SCREEN_HPAGE                   0x002c
  45 #define EP93XXFB_SCREEN_LINES                   0x0030
  46 #define EP93XXFB_LINE_LENGTH                    0x0034
  47 #define EP93XXFB_VLINE_STEP                     0x0038
  48 #define EP93XXFB_LINE_CARRY                     0x003c  /* SW locked */
  49 #define EP93XXFB_EOL_OFFSET                     0x0230
  50
  51 /* Other Video Registers */
  52 #define EP93XXFB_BRIGHTNESS                     0x0020
  53 #define EP93XXFB_ATTRIBS                        0x0024  /* SW locked */
  54 #define EP93XXFB_SWLOCK                         0x007c  /* SW locked */
  55 #define EP93XXFB_AC_RATE                        0x0214
  56 #define EP93XXFB_FIFO_LEVEL                     0x0234
  57 #define EP93XXFB_PIXELMODE                      0x0054
  58 #define EP93XXFB_PIXELMODE_32BPP                (0x7 << 0)
  59 #define EP93XXFB_PIXELMODE_24BPP                (0x6 << 0)
  60 #define EP93XXFB_PIXELMODE_16BPP                (0x4 << 0)
  61 #define EP93XXFB_PIXELMODE_8BPP                 (0x2 << 0)
  62 #define EP93XXFB_PIXELMODE_SHIFT_1P_24B         (0x0 << 3)
  63 #define EP93XXFB_PIXELMODE_SHIFT_1P_18B         (0x1 << 3)
  64 #define EP93XXFB_PIXELMODE_COLOR_LUT            (0x0 << 10)
  65 #define EP93XXFB_PIXELMODE_COLOR_888            (0x4 << 10)
  66 #define EP93XXFB_PIXELMODE_COLOR_555            (0x5 << 10)
  67 #define EP93XXFB_PARL_IF_OUT                    0x0058
  68 #define EP93XXFB_PARL_IF_IN                     0x005c
  69
  70 /* Blink Control Registers */
  71 #define EP93XXFB_BLINK_RATE                     0x0040
  72 #define EP93XXFB_BLINK_MASK                     0x0044
  73 #define EP93XXFB_BLINK_PATTRN                   0x0048
  74 #define EP93XXFB_PATTRN_MASK                    0x004c
  75 #define EP93XXFB_BKGRND_OFFSET                  0x0050
  76
  77 /* Hardware Cursor Registers */
  78 #define EP93XXFB_CURSOR_ADR_START               0x0060
  79 #define EP93XXFB_CURSOR_ADR_RESET               0x0064
  80 #define EP93XXFB_CURSOR_SIZE                    0x0068
  81 #define EP93XXFB_CURSOR_COLOR1                  0x006c
  82 #define EP93XXFB_CURSOR_COLOR2                  0x0070
  83 #define EP93XXFB_CURSOR_BLINK_COLOR1            0x021c
  84 #define EP93XXFB_CURSOR_BLINK_COLOR2            0x0220
  85 #define EP93XXFB_CURSOR_XY_LOC                  0x0074
  86 #define EP93XXFB_CURSOR_DSCAN_HY_LOC            0x0078
  87 #define EP93XXFB_CURSOR_BLINK_RATE_CTRL         0x0224
  88
  89 /* LUT Registers */
  90 #define EP93XXFB_GRY_SCL_LUTR                   0x0080
  91 #define EP93XXFB_GRY_SCL_LUTG                   0x0280
  92 #define EP93XXFB_GRY_SCL_LUTB                   0x0300
  93 #define EP93XXFB_LUT_SW_CONTROL                 0x0218
  94 #define EP93XXFB_LUT_SW_CONTROL_SWTCH           (1 << 0)
  95 #define EP93XXFB_LUT_SW_CONTROL_SSTAT           (1 << 1)
  96 #define EP93XXFB_COLOR_LUT                      0x0400
  97
  98 /* Video Signature Registers */
  99 #define EP93XXFB_VID_SIG_RSLT_VAL               0x0200
 100 #define EP93XXFB_VID_SIG_CTRL                   0x0204
 101 #define EP93XXFB_VSIG                           0x0208
 102 #define EP93XXFB_HSIG                           0x020c
 103 #define EP93XXFB_SIG_CLR_STR                    0x0210
 104
 105 /* Minimum / Maximum resolutions supported */
 106 #define EP93XXFB_MIN_XRES                       64
 107 #define EP93XXFB_MIN_YRES                       64
 108 #define EP93XXFB_MAX_XRES                       1024
 109 #define EP93XXFB_MAX_YRES                       768
 110
 111 struct ep93xx_fbi {
 112         struct ep93xxfb_mach_info       *mach_info;
 113         struct clk                      *clk;
 114         struct resource                 *res;
 115         void __iomem                    *mmio_base;
 116         unsigned int                    pseudo_palette[256];
 117 };
 118
 119 static int check_screenpage_bug = 1;
 120 module_param(check_screenpage_bug, int, 0644);
 121 MODULE_PARM_DESC(check_screenpage_bug,
 122                  "Check for bit 27 screen page bug. Default = 1");
 123
 124 static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi,
 125                                           unsigned int off)
 126 {
 127         return __raw_readl(fbi->mmio_base + off);
 128 }
 129
 130 static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi,
 131                                    unsigned int val, unsigned int off)
 132 {
 133         __raw_writel(val, fbi->mmio_base + off);
 134 }
 135
 136 /*
 137  * Write to one of the locked raster registers.
 138  */
 139 static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi,
 140                                        unsigned int val, unsigned int reg)
 141 {
 142         /*
 143          * We don't need a lock or delay here since the raster register
 144          * block will remain unlocked until the next access.
 145          */
 146         ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK);
 147         ep93xxfb_writel(fbi, val, reg);
 148 }
 149
 150 static void ep93xxfb_set_video_attribs(struct fb_info *info)
 151 {
 152         struct ep93xx_fbi *fbi = info->par;
 153         unsigned int attribs;
 154
 155         attribs = EP93XXFB_ENABLE;
 156         attribs |= fbi->mach_info->flags;
 157         ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS);
 158 }
 159
 160 static int ep93xxfb_set_pixelmode(struct fb_info *info)
 161 {
 162         struct ep93xx_fbi *fbi = info->par;
 163         unsigned int val;
 164
 165         info->var.transp.offset = 0;
 166         info->var.transp.length = 0;
 167
 168         switch (info->var.bits_per_pixel) {
 169         case 8:
 170                 val = EP93XXFB_PIXELMODE_8BPP | EP93XXFB_PIXELMODE_COLOR_LUT |
 171                         EP93XXFB_PIXELMODE_SHIFT_1P_18B;
 172
 173                 info->var.red.offset    = 0;
 174                 info->var.red.length    = 8;
 175                 info->var.green.offset  = 0;
 176                 info->var.green.length  = 8;
 177                 info->var.blue.offset   = 0;
 178                 info->var.blue.length   = 8;
 179                 info->fix.visual        = FB_VISUAL_PSEUDOCOLOR;
 180                 break;
 181
 182         case 16:
 183                 val = EP93XXFB_PIXELMODE_16BPP | EP93XXFB_PIXELMODE_COLOR_555 |
 184                         EP93XXFB_PIXELMODE_SHIFT_1P_18B;
 185
 186                 info->var.red.offset    = 11;
 187                 info->var.red.length    = 5;
 188                 info->var.green.offset  = 5;
 189                 info->var.green.length  = 6;
 190                 info->var.blue.offset   = 0;
 191                 info->var.blue.length   = 5;
 192                 info->fix.visual        = FB_VISUAL_TRUECOLOR;
 193                 break;
 194
 195         case 24:
 196                 val = EP93XXFB_PIXELMODE_24BPP | EP93XXFB_PIXELMODE_COLOR_888 |
 197                         EP93XXFB_PIXELMODE_SHIFT_1P_24B;
 198
 199                 info->var.red.offset    = 16;
 200                 info->var.red.length    = 8;
 201                 info->var.green.offset  = 8;
 202                 info->var.green.length  = 8;
 203                 info->var.blue.offset   = 0;
 204                 info->var.blue.length   = 8;
 205                 info->fix.visual        = FB_VISUAL_TRUECOLOR;
 206                 break;
 207
 208         case 32:
 209                 val = EP93XXFB_PIXELMODE_32BPP | EP93XXFB_PIXELMODE_COLOR_888 |
 210                         EP93XXFB_PIXELMODE_SHIFT_1P_24B;
 211
 212                 info->var.red.offset    = 16;
 213                 info->var.red.length    = 8;
 214                 info->var.green.offset  = 8;
 215                 info->var.green.length  = 8;
 216                 info->var.blue.offset   = 0;
 217                 info->var.blue.length   = 8;
 218                 info->fix.visual        = FB_VISUAL_TRUECOLOR;
 219                 break;
 220
 221         default:
 222                 return -EINVAL;
 223         }
 224
 225         ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE);
 226         return 0;
 227 }
 228
 229 static void ep93xxfb_set_timing(struct fb_info *info)
 230 {
 231         struct ep93xx_fbi *fbi = info->par;
 232         unsigned int vlines_total, hclks_total, start, stop;
 233
 234         vlines_total = info->var.yres + info->var.upper_margin +
 235                 info->var.lower_margin + info->var.vsync_len - 1;
 236
 237         hclks_total = info->var.xres + info->var.left_margin +
 238                 info->var.right_margin + info->var.hsync_len - 1;
 239
 240         ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL);
 241         ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL);
 242
 243         start = vlines_total;
 244         stop = vlines_total - info->var.vsync_len;
 245         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VSYNC);
 246
 247         start = vlines_total - info->var.vsync_len - info->var.upper_margin;
 248         stop = info->var.lower_margin - 1;
 249         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VBLANK);
 250         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VACTIVE);
 251
 252         start = vlines_total;
 253         stop = vlines_total + 1;
 254         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VCLK);
 255
 256         start = hclks_total;
 257         stop = hclks_total - info->var.hsync_len;
 258         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HSYNC);
 259
 260         start = hclks_total - info->var.hsync_len - info->var.left_margin;
 261         stop = info->var.right_margin - 1;
 262         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HBLANK);
 263         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HACTIVE);
 264
 265         start = hclks_total;
 266         stop = hclks_total;
 267         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HCLK);
 268
 269         ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY);
 270 }
 271
 272 static int ep93xxfb_set_par(struct fb_info *info)
 273 {
 274         struct ep93xx_fbi *fbi = info->par;
 275
 276         clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock));
 277
 278         ep93xxfb_set_timing(info);
 279
 280         info->fix.line_length = info->var.xres_virtual *
 281                 info->var.bits_per_pixel / 8;
 282
 283         ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE);
 284         ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES);
 285         ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel)
 286                               / 32) - 1, EP93XXFB_LINE_LENGTH);
 287         ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP);
 288         ep93xxfb_set_video_attribs(info);
 289         return 0;
 290 }
 291
 292 static int ep93xxfb_check_var(struct fb_var_screeninfo *var,
 293                               struct fb_info *info)
 294 {
 295         int err;
 296
 297         err = ep93xxfb_set_pixelmode(info);
 298         if (err)
 299                 return err;
 300
 301         var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES);
 302         var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES);
 303         var->xres_virtual = max(var->xres_virtual, var->xres);
 304
 305         var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES);
 306         var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES);
 307         var->yres_virtual = max(var->yres_virtual, var->yres);
 308
 309         return 0;
 310 }
 311
 312 static int ep93xxfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 313 {
 314         unsigned int offset = vma->vm_pgoff << PAGE_SHIFT;
 315
 316         if (offset < info->fix.smem_len) {
 317                 return dma_mmap_writecombine(info->dev, vma, info->screen_base,
 318                                              info->fix.smem_start,
 319                                              info->fix.smem_len);
 320         }
 321
 322         return -EINVAL;
 323 }
 324
 325 static int ep93xxfb_blank(int blank_mode, struct fb_info *info)
 326 {
 327         struct ep93xx_fbi *fbi = info->par;
 328         unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS);
 329
 330         if (blank_mode) {
 331                 if (fbi->mach_info->blank)
 332                         fbi->mach_info->blank(blank_mode, info);
 333                 ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE,
 334                                     EP93XXFB_ATTRIBS);
 335                 clk_disable(fbi->clk);
 336         } else {
 337                 clk_enable(fbi->clk);
 338                 ep93xxfb_out_locked(fbi, attribs | EP93XXFB_ENABLE,
 339                                     EP93XXFB_ATTRIBS);
 340                 if (fbi->mach_info->blank)
 341                         fbi->mach_info->blank(blank_mode, info);
 342         }
 343
 344         return 0;
 345 }
 346
 347 static inline int ep93xxfb_convert_color(int val, int width)
 348 {
 349         return ((val << width) + 0x7fff - val) >> 16;
 350 }
 351
 352 static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red,
 353                               unsigned int green, unsigned int blue,
 354                               unsigned int transp, struct fb_info *info)
 355 {
 356         struct ep93xx_fbi *fbi = info->par;
 357         unsigned int *pal = info->pseudo_palette;
 358         unsigned int ctrl, i, rgb, lut_current, lut_stat;
 359
 360         switch (info->fix.visual) {
 361         case FB_VISUAL_PSEUDOCOLOR:
 362                 if (regno > 255)
 363                         return 1;
 364                 rgb = ((red & 0xff00) << 8) | (green & 0xff00) |
 365                         ((blue & 0xff00) >> 8);
 366
 367                 pal[regno] = rgb;
 368                 ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2)));
 369                 ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL);
 370                 lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT);
 371                 lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH);
 372
 373                 if (lut_stat == lut_current) {
 374                         for (i = 0; i < 256; i++) {
 375                                 ep93xxfb_writel(fbi, pal[i],
 376                                         EP93XXFB_COLOR_LUT + (i << 2));
 377                         }
 378
 379                         ep93xxfb_writel(fbi,
 380                                         ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH,
 381                                         EP93XXFB_LUT_SW_CONTROL);
 382                 }
 383                 break;
 384
 385         case FB_VISUAL_TRUECOLOR:
 386                 if (regno > 16)
 387                         return 1;
 388
 389                 red = ep93xxfb_convert_color(red, info->var.red.length);
 390                 green = ep93xxfb_convert_color(green, info->var.green.length);
 391                 blue = ep93xxfb_convert_color(blue, info->var.blue.length);
 392                 transp = ep93xxfb_convert_color(transp,
 393                                                 info->var.transp.length);
 394
 395                 pal[regno] = (red << info->var.red.offset) |
 396                         (green << info->var.green.offset) |
 397                         (blue << info->var.blue.offset) |
 398                         (transp << info->var.transp.offset);
 399                 break;
 400
 401         default:
 402                 return 1;
 403         }
 404
 405         return 0;
 406 }
 407
 408 static struct fb_ops ep93xxfb_ops = {
 409         .owner          = THIS_MODULE,
 410         .fb_check_var   = ep93xxfb_check_var,
 411         .fb_set_par     = ep93xxfb_set_par,
 412         .fb_blank       = ep93xxfb_blank,
 413         .fb_fillrect    = cfb_fillrect,
 414         .fb_copyarea    = cfb_copyarea,
 415         .fb_imageblit   = cfb_imageblit,
 416         .fb_setcolreg   = ep93xxfb_setcolreg,
 417         .fb_mmap        = ep93xxfb_mmap,
 418 };
 419
 420 static int __init ep93xxfb_calc_fbsize(struct ep93xxfb_mach_info *mach_info)
 421 {
 422         int i, fb_size = 0;
 423
 424         if (mach_info->num_modes == EP93XXFB_USE_MODEDB) {
 425                 fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES *
 426                         mach_info->bpp / 8;
 427         } else {
 428                 for (i = 0; i < mach_info->num_modes; i++) {
 429                         const struct fb_videomode *mode;
 430                         int size;
 431
 432                         mode = &mach_info->modes[i];
 433                         size = mode->xres * mode->yres * mach_info->bpp / 8;
 434                         if (size > fb_size)
 435                                 fb_size = size;
 436                 }
 437         }
 438
 439         return fb_size;
 440 }
 441
 442 static int __init ep93xxfb_alloc_videomem(struct fb_info *info)
 443 {
 444         struct ep93xx_fbi *fbi = info->par;
 445         char __iomem *virt_addr;
 446         dma_addr_t phys_addr;
 447         unsigned int fb_size;
 448
 449         fb_size = ep93xxfb_calc_fbsize(fbi->mach_info);
 450         virt_addr = dma_alloc_writecombine(info->dev, fb_size,
 451                                            &phys_addr, GFP_KERNEL);
 452         if (!virt_addr)
 453                 return -ENOMEM;
 454
 455         /*
 456          * There is a bug in the ep93xx framebuffer which causes problems
 457          * if bit 27 of the physical address is set.
 458          * See: http://marc.info/?l=linux-arm-kernel&m=110061245502000&w=2
 459          * There does not seem to be any offical errata for this, but I
 460          * have confirmed the problem exists on my hardware (ep9315) at
 461          * least.
 462          */
 463         if (check_screenpage_bug && phys_addr & (1 << 27)) {
 464                 dev_err(info->dev, "ep93xx framebuffer bug. phys addr (0x%x) "
 465                         "has bit 27 set: cannot init framebuffer\n",
 466                         phys_addr);
 467
 468                 dma_free_coherent(info->dev, fb_size, virt_addr, phys_addr);
 469                 return -ENOMEM;
 470         }
 471
 472         info->fix.smem_start = phys_addr;
 473         info->fix.smem_len = fb_size;
 474         info->screen_base = virt_addr;
 475
 476         return 0;
 477 }
 478
 479 static void ep93xxfb_dealloc_videomem(struct fb_info *info)
 480 {
 481         if (info->screen_base)
 482                 dma_free_coherent(info->dev, info->fix.smem_len,
 483                                   info->screen_base, info->fix.smem_start);
 484 }
 485
 486 static int __init ep93xxfb_probe(struct platform_device *pdev)
 487 {
 488         struct ep93xxfb_mach_info *mach_info = pdev->dev.platform_data;
 489         struct fb_info *info;
 490         struct ep93xx_fbi *fbi;
 491         struct resource *res;
 492         char *video_mode;
 493         int err;
 494
 495         if (!mach_info)
 496                 return -EINVAL;
 497
 498         info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev);
 499         if (!info)
 500                 return -ENOMEM;
 501
 502         info->dev = &pdev->dev;
 503         platform_set_drvdata(pdev, info);
 504         fbi = info->par;
 505         fbi->mach_info = mach_info;
 506
 507         err = fb_alloc_cmap(&info->cmap, 256, 0);
 508         if (err)
 509                 goto failed;
 510
 511         err = ep93xxfb_alloc_videomem(info);
 512         if (err)
 513                 goto failed;
 514
 515         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 516         if (!res) {
 517                 err = -ENXIO;
 518                 goto failed;
 519         }
 520
 521         res = request_mem_region(res->start, resource_size(res), pdev->name);
 522         if (!res) {
 523                 err = -EBUSY;
 524                 goto failed;
 525         }
 526
 527         fbi->res = res;
 528         fbi->mmio_base = ioremap(res->start, resource_size(res));
 529         if (!fbi->mmio_base) {
 530                 err = -ENXIO;
 531                 goto failed;
 532         }
 533
 534         strcpy(info->fix.id, pdev->name);
 535         info->fbops             = &ep93xxfb_ops;
 536         info->fix.type          = FB_TYPE_PACKED_PIXELS;
 537         info->fix.accel         = FB_ACCEL_NONE;
 538         info->var.activate      = FB_ACTIVATE_NOW;
 539         info->var.vmode         = FB_VMODE_NONINTERLACED;
 540         info->flags             = FBINFO_DEFAULT;
 541         info->node              = -1;
 542         info->state             = FBINFO_STATE_RUNNING;
 543         info->pseudo_palette    = &fbi->pseudo_palette;
 544
 545         fb_get_options("ep93xx-fb", &video_mode);
 546         err = fb_find_mode(&info->var, info, video_mode,
 547                            fbi->mach_info->modes, fbi->mach_info->num_modes,
 548                            fbi->mach_info->default_mode, fbi->mach_info->bpp);
 549         if (err == 0) {
 550                 dev_err(info->dev, "No suitable video mode found\n");
 551                 err = -EINVAL;
 552                 goto failed;
 553         }
 554
 555         if (mach_info->setup) {
 556                 err = mach_info->setup(pdev);
 557                 if (err)
 558                         return err;
 559         }
 560
 561         err = ep93xxfb_check_var(&info->var, info);
 562         if (err)
 563                 goto failed;
 564
 565         fbi->clk = clk_get(info->dev, NULL);
 566         if (IS_ERR(fbi->clk)) {
 567                 err = PTR_ERR(fbi->clk);
 568                 fbi->clk = NULL;
 569                 goto failed;
 570         }
 571
 572         ep93xxfb_set_par(info);
 573         clk_enable(fbi->clk);
 574
 575         err = register_framebuffer(info);
 576         if (err)
 577                 goto failed;
 578
 579         dev_info(info->dev, "registered. Mode = %dx%d-%d\n",
 580                  info->var.xres, info->var.yres, info->var.bits_per_pixel);
 581         return 0;
 582
 583 failed:
 584         if (fbi->clk)
 585                 clk_put(fbi->clk);
 586         if (fbi->mmio_base)
 587                 iounmap(fbi->mmio_base);
 588         if (fbi->res)
 589                 release_mem_region(fbi->res->start, resource_size(fbi->res));
 590         ep93xxfb_dealloc_videomem(info);
 591         if (&info->cmap)
 592                 fb_dealloc_cmap(&info->cmap);
 593         if (fbi->mach_info->teardown)
 594                 fbi->mach_info->teardown(pdev);
 595         kfree(info);
 596         platform_set_drvdata(pdev, NULL);
 597
 598         return err;
 599 }
 600
 601 static int ep93xxfb_remove(struct platform_device *pdev)
 602 {
 603         struct fb_info *info = platform_get_drvdata(pdev);
 604         struct ep93xx_fbi *fbi = info->par;
 605
 606         unregister_framebuffer(info);
 607         clk_disable(fbi->clk);
 608         clk_put(fbi->clk);
 609         iounmap(fbi->mmio_base);
 610         release_mem_region(fbi->res->start, resource_size(fbi->res));
 611         ep93xxfb_dealloc_videomem(info);
 612         fb_dealloc_cmap(&info->cmap);
 613
 614         if (fbi->mach_info->teardown)
 615                 fbi->mach_info->teardown(pdev);
 616
 617         kfree(info);
 618         platform_set_drvdata(pdev, NULL);
 619
 620         return 0;
 621 }
 622
 623 static struct platform_driver ep93xxfb_driver = {
 624         .probe          = ep93xxfb_probe,
 625         .remove         = ep93xxfb_remove,
 626         .driver = {
 627                 .name   = "ep93xx-fb",
 628                 .owner  = THIS_MODULE,
 629         },
 630 };
 631
 632 static int __devinit ep93xxfb_init(void)
 633 {
 634         return platform_driver_register(&ep93xxfb_driver);
 635 }
 636
 637 static void __exit ep93xxfb_exit(void)
 638 {
 639         platform_driver_unregister(&ep93xxfb_driver);
 640 }
 641
 642 module_init(ep93xxfb_init);
 643 module_exit(ep93xxfb_exit);
 644
 645 MODULE_DESCRIPTION("EP93XX Framebuffer Driver");
 646 MODULE_ALIAS("platform:ep93xx-fb");
 647 MODULE_AUTHOR("Ryan Mallon <ryan&bluewatersys.com>, "
 648               "H Hartley Sweeten <hsweeten@visionengravers.com");
 649 MODULE_LICENSE("GPL");