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