drivers/video/fbdev/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
   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/module.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/slab.h>
  24 #include <linux/clk.h>
  25 #include <linux/fb.h>
  26 #include <linux/io.h>
  27
  28 #include <linux/platform_data/video-ep93xx.h>
  29
  30 /* Vertical Frame Timing Registers */
  31 #define EP93XXFB_VLINES_TOTAL                   0x0000  /* SW locked */
  32 #define EP93XXFB_VSYNC                          0x0004  /* SW locked */
  33 #define EP93XXFB_VACTIVE                        0x0008  /* SW locked */
  34 #define EP93XXFB_VBLANK                         0x0228  /* SW locked */
  35 #define EP93XXFB_VCLK                           0x000c  /* SW locked */
  36
  37 /* Horizontal Frame Timing Registers */
  38 #define EP93XXFB_HCLKS_TOTAL                    0x0010  /* SW locked */
  39 #define EP93XXFB_HSYNC                          0x0014  /* SW locked */
  40 #define EP93XXFB_HACTIVE                        0x0018  /* SW locked */
  41 #define EP93XXFB_HBLANK                         0x022c  /* SW locked */
  42 #define EP93XXFB_HCLK                           0x001c  /* SW locked */
  43
  44 /* Frame Buffer Memory Configuration Registers */
  45 #define EP93XXFB_SCREEN_PAGE                    0x0028
  46 #define EP93XXFB_SCREEN_HPAGE                   0x002c
  47 #define EP93XXFB_SCREEN_LINES                   0x0030
  48 #define EP93XXFB_LINE_LENGTH                    0x0034
  49 #define EP93XXFB_VLINE_STEP                     0x0038
  50 #define EP93XXFB_LINE_CARRY                     0x003c  /* SW locked */
  51 #define EP93XXFB_EOL_OFFSET                     0x0230
  52
  53 /* Other Video Registers */
  54 #define EP93XXFB_BRIGHTNESS                     0x0020
  55 #define EP93XXFB_ATTRIBS                        0x0024  /* SW locked */
  56 #define EP93XXFB_SWLOCK                         0x007c  /* SW locked */
  57 #define EP93XXFB_AC_RATE                        0x0214
  58 #define EP93XXFB_FIFO_LEVEL                     0x0234
  59 #define EP93XXFB_PIXELMODE                      0x0054
  60 #define EP93XXFB_PIXELMODE_32BPP                (0x7 << 0)
  61 #define EP93XXFB_PIXELMODE_24BPP                (0x6 << 0)
  62 #define EP93XXFB_PIXELMODE_16BPP                (0x4 << 0)
  63 #define EP93XXFB_PIXELMODE_8BPP                 (0x2 << 0)
  64 #define EP93XXFB_PIXELMODE_SHIFT_1P_24B         (0x0 << 3)
  65 #define EP93XXFB_PIXELMODE_SHIFT_1P_18B         (0x1 << 3)
  66 #define EP93XXFB_PIXELMODE_COLOR_LUT            (0x0 << 10)
  67 #define EP93XXFB_PIXELMODE_COLOR_888            (0x4 << 10)
  68 #define EP93XXFB_PIXELMODE_COLOR_555            (0x5 << 10)
  69 #define EP93XXFB_PARL_IF_OUT                    0x0058
  70 #define EP93XXFB_PARL_IF_IN                     0x005c
  71
  72 /* Blink Control Registers */
  73 #define EP93XXFB_BLINK_RATE                     0x0040
  74 #define EP93XXFB_BLINK_MASK                     0x0044
  75 #define EP93XXFB_BLINK_PATTRN                   0x0048
  76 #define EP93XXFB_PATTRN_MASK                    0x004c
  77 #define EP93XXFB_BKGRND_OFFSET                  0x0050
  78
  79 /* Hardware Cursor Registers */
  80 #define EP93XXFB_CURSOR_ADR_START               0x0060
  81 #define EP93XXFB_CURSOR_ADR_RESET               0x0064
  82 #define EP93XXFB_CURSOR_SIZE                    0x0068
  83 #define EP93XXFB_CURSOR_COLOR1                  0x006c
  84 #define EP93XXFB_CURSOR_COLOR2                  0x0070
  85 #define EP93XXFB_CURSOR_BLINK_COLOR1            0x021c
  86 #define EP93XXFB_CURSOR_BLINK_COLOR2            0x0220
  87 #define EP93XXFB_CURSOR_XY_LOC                  0x0074
  88 #define EP93XXFB_CURSOR_DSCAN_HY_LOC            0x0078
  89 #define EP93XXFB_CURSOR_BLINK_RATE_CTRL         0x0224
  90
  91 /* LUT Registers */
  92 #define EP93XXFB_GRY_SCL_LUTR                   0x0080
  93 #define EP93XXFB_GRY_SCL_LUTG                   0x0280
  94 #define EP93XXFB_GRY_SCL_LUTB                   0x0300
  95 #define EP93XXFB_LUT_SW_CONTROL                 0x0218
  96 #define EP93XXFB_LUT_SW_CONTROL_SWTCH           (1 << 0)
  97 #define EP93XXFB_LUT_SW_CONTROL_SSTAT           (1 << 1)
  98 #define EP93XXFB_COLOR_LUT                      0x0400
  99
 100 /* Video Signature Registers */
 101 #define EP93XXFB_VID_SIG_RSLT_VAL               0x0200
 102 #define EP93XXFB_VID_SIG_CTRL                   0x0204
 103 #define EP93XXFB_VSIG                           0x0208
 104 #define EP93XXFB_HSIG                           0x020c
 105 #define EP93XXFB_SIG_CLR_STR                    0x0210
 106
 107 /* Minimum / Maximum resolutions supported */
 108 #define EP93XXFB_MIN_XRES                       64
 109 #define EP93XXFB_MIN_YRES                       64
 110 #define EP93XXFB_MAX_XRES                       1024
 111 #define EP93XXFB_MAX_YRES                       768
 112
 113 struct ep93xx_fbi {
 114         struct ep93xxfb_mach_info       *mach_info;
 115         struct clk                      *clk;
 116         struct resource                 *res;
 117         void __iomem                    *mmio_base;
 118         unsigned int                    pseudo_palette[256];
 119 };
 120
 121 static int check_screenpage_bug = 1;
 122 module_param(check_screenpage_bug, int, 0644);
 123 MODULE_PARM_DESC(check_screenpage_bug,
 124                  "Check for bit 27 screen page bug. Default = 1");
 125
 126 static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi,
 127                                           unsigned int off)
 128 {
 129         return __raw_readl(fbi->mmio_base + off);
 130 }
 131
 132 static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi,
 133                                    unsigned int val, unsigned int off)
 134 {
 135         __raw_writel(val, fbi->mmio_base + off);
 136 }
 137
 138 /*
 139  * Write to one of the locked raster registers.
 140  */
 141 static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi,
 142                                        unsigned int val, unsigned int reg)
 143 {
 144         /*
 145          * We don't need a lock or delay here since the raster register
 146          * block will remain unlocked until the next access.
 147          */
 148         ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK);
 149         ep93xxfb_writel(fbi, val, reg);
 150 }
 151
 152 static void ep93xxfb_set_video_attribs(struct fb_info *info)
 153 {
 154         struct ep93xx_fbi *fbi = info->par;
 155         unsigned int attribs;
 156
 157         attribs = EP93XXFB_ENABLE;
 158         attribs |= fbi->mach_info->flags;
 159         ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS);
 160 }
 161
 162 static int ep93xxfb_set_pixelmode(struct fb_info *info)
 163 {
 164         struct ep93xx_fbi *fbi = info->par;
 165         unsigned int val;
 166
 167         info->var.transp.offset = 0;
 168         info->var.transp.length = 0;
 169
 170         switch (info->var.bits_per_pixel) {
 171         case 8:
 172                 val = EP93XXFB_PIXELMODE_8BPP | EP93XXFB_PIXELMODE_COLOR_LUT |
 173                         EP93XXFB_PIXELMODE_SHIFT_1P_18B;
 174
 175                 info->var.red.offset    = 0;
 176                 info->var.red.length    = 8;
 177                 info->var.green.offset  = 0;
 178                 info->var.green.length  = 8;
 179                 info->var.blue.offset   = 0;
 180                 info->var.blue.length   = 8;
 181                 info->fix.visual        = FB_VISUAL_PSEUDOCOLOR;
 182                 break;
 183
 184         case 16:
 185                 val = EP93XXFB_PIXELMODE_16BPP | EP93XXFB_PIXELMODE_COLOR_555 |
 186                         EP93XXFB_PIXELMODE_SHIFT_1P_18B;
 187
 188                 info->var.red.offset    = 11;
 189                 info->var.red.length    = 5;
 190                 info->var.green.offset  = 5;
 191                 info->var.green.length  = 6;
 192                 info->var.blue.offset   = 0;
 193                 info->var.blue.length   = 5;
 194                 info->fix.visual        = FB_VISUAL_TRUECOLOR;
 195                 break;
 196
 197         case 24:
 198                 val = EP93XXFB_PIXELMODE_24BPP | EP93XXFB_PIXELMODE_COLOR_888 |
 199                         EP93XXFB_PIXELMODE_SHIFT_1P_24B;
 200
 201                 info->var.red.offset    = 16;
 202                 info->var.red.length    = 8;
 203                 info->var.green.offset  = 8;
 204                 info->var.green.length  = 8;
 205                 info->var.blue.offset   = 0;
 206                 info->var.blue.length   = 8;
 207                 info->fix.visual        = FB_VISUAL_TRUECOLOR;
 208                 break;
 209
 210         case 32:
 211                 val = EP93XXFB_PIXELMODE_32BPP | EP93XXFB_PIXELMODE_COLOR_888 |
 212                         EP93XXFB_PIXELMODE_SHIFT_1P_24B;
 213
 214                 info->var.red.offset    = 16;
 215                 info->var.red.length    = 8;
 216                 info->var.green.offset  = 8;
 217                 info->var.green.length  = 8;
 218                 info->var.blue.offset   = 0;
 219                 info->var.blue.length   = 8;
 220                 info->fix.visual        = FB_VISUAL_TRUECOLOR;
 221                 break;
 222
 223         default:
 224                 return -EINVAL;
 225         }
 226
 227         ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE);
 228         return 0;
 229 }
 230
 231 static void ep93xxfb_set_timing(struct fb_info *info)
 232 {
 233         struct ep93xx_fbi *fbi = info->par;
 234         unsigned int vlines_total, hclks_total, start, stop;
 235
 236         vlines_total = info->var.yres + info->var.upper_margin +
 237                 info->var.lower_margin + info->var.vsync_len - 1;
 238
 239         hclks_total = info->var.xres + info->var.left_margin +
 240                 info->var.right_margin + info->var.hsync_len - 1;
 241
 242         ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL);
 243         ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL);
 244
 245         start = vlines_total;
 246         stop = vlines_total - info->var.vsync_len;
 247         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VSYNC);
 248
 249         start = vlines_total - info->var.vsync_len - info->var.upper_margin;
 250         stop = info->var.lower_margin - 1;
 251         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VBLANK);
 252         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VACTIVE);
 253
 254         start = vlines_total;
 255         stop = vlines_total + 1;
 256         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VCLK);
 257
 258         start = hclks_total;
 259         stop = hclks_total - info->var.hsync_len;
 260         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HSYNC);
 261
 262         start = hclks_total - info->var.hsync_len - info->var.left_margin;
 263         stop = info->var.right_margin - 1;
 264         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HBLANK);
 265         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HACTIVE);
 266
 267         start = hclks_total;
 268         stop = hclks_total;
 269         ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HCLK);
 270
 271         ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY);
 272 }
 273
 274 static int ep93xxfb_set_par(struct fb_info *info)
 275 {
 276         struct ep93xx_fbi *fbi = info->par;
 277
 278         clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock));
 279
 280         ep93xxfb_set_timing(info);
 281
 282         info->fix.line_length = info->var.xres_virtual *
 283                 info->var.bits_per_pixel / 8;
 284
 285         ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE);
 286         ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES);
 287         ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel)
 288                               / 32) - 1, EP93XXFB_LINE_LENGTH);
 289         ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP);
 290         ep93xxfb_set_video_attribs(info);
 291         return 0;
 292 }
 293
 294 static int ep93xxfb_check_var(struct fb_var_screeninfo *var,
 295                               struct fb_info *info)
 296 {
 297         int err;
 298
 299         err = ep93xxfb_set_pixelmode(info);
 300         if (err)
 301                 return err;
 302
 303         var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES);
 304         var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES);
 305         var->xres_virtual = max(var->xres_virtual, var->xres);
 306
 307         var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES);
 308         var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES);
 309         var->yres_virtual = max(var->yres_virtual, var->yres);
 310
 311         return 0;
 312 }
 313
 314 static int ep93xxfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 315 {
 316         unsigned int offset = vma->vm_pgoff << PAGE_SHIFT;
 317
 318         if (offset < info->fix.smem_len) {
 319                 return dma_mmap_wc(info->dev, vma, info->screen_base,
 320                                    info->fix.smem_start, info->fix.smem_len);
 321         }
 322
 323         return -EINVAL;
 324 }
 325
 326 static int ep93xxfb_blank(int blank_mode, struct fb_info *info)
 327 {
 328         struct ep93xx_fbi *fbi = info->par;
 329         unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS);
 330
 331         if (blank_mode) {
 332                 if (fbi->mach_info->blank)
 333                         fbi->mach_info->blank(blank_mode, info);
 334                 ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE,
 335                                     EP93XXFB_ATTRIBS);
 336                 clk_disable(fbi->clk);
 337         } else {
 338                 clk_enable(fbi->clk);
 339                 ep93xxfb_out_locked(fbi, attribs | EP93XXFB_ENABLE,
 340                                     EP93XXFB_ATTRIBS);
 341                 if (fbi->mach_info->blank)
 342                         fbi->mach_info->blank(blank_mode, info);
 343         }
 344
 345         return 0;
 346 }
 347
 348 static inline int ep93xxfb_convert_color(int val, int width)
 349 {
 350         return ((val << width) + 0x7fff - val) >> 16;
 351 }
 352
 353 static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red,
 354                               unsigned int green, unsigned int blue,
 355                               unsigned int transp, struct fb_info *info)
 356 {
 357         struct ep93xx_fbi *fbi = info->par;
 358         unsigned int *pal = info->pseudo_palette;
 359         unsigned int ctrl, i, rgb, lut_current, lut_stat;
 360
 361         switch (info->fix.visual) {
 362         case FB_VISUAL_PSEUDOCOLOR:
 363                 if (regno > 255)
 364                         return 1;
 365                 rgb = ((red & 0xff00) << 8) | (green & 0xff00) |
 366                         ((blue & 0xff00) >> 8);
 367
 368                 pal[regno] = rgb;
 369                 ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2)));
 370                 ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL);
 371                 lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT);
 372                 lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH);
 373
 374                 if (lut_stat == lut_current) {
 375                         for (i = 0; i < 256; i++) {
 376                                 ep93xxfb_writel(fbi, pal[i],
 377                                         EP93XXFB_COLOR_LUT + (i << 2));
 378                         }
 379
 380                         ep93xxfb_writel(fbi,
 381                                         ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH,
 382                                         EP93XXFB_LUT_SW_CONTROL);
 383                 }
 384                 break;
 385
 386         case FB_VISUAL_TRUECOLOR:
 387                 if (regno > 16)
 388                         return 1;
 389
 390                 red = ep93xxfb_convert_color(red, info->var.red.length);
 391                 green = ep93xxfb_convert_color(green, info->var.green.length);
 392                 blue = ep93xxfb_convert_color(blue, info->var.blue.length);
 393                 transp = ep93xxfb_convert_color(transp,
 394                                                 info->var.transp.length);
 395
 396                 pal[regno] = (red << info->var.red.offset) |
 397                         (green << info->var.green.offset) |
 398                         (blue << info->var.blue.offset) |
 399                         (transp << info->var.transp.offset);
 400                 break;
 401
 402         default:
 403                 return 1;
 404         }
 405
 406         return 0;
 407 }
 408
 409 static struct fb_ops ep93xxfb_ops = {
 410         .owner          = THIS_MODULE,
 411         .fb_check_var   = ep93xxfb_check_var,
 412         .fb_set_par     = ep93xxfb_set_par,
 413         .fb_blank       = ep93xxfb_blank,
 414         .fb_fillrect    = cfb_fillrect,
 415         .fb_copyarea    = cfb_copyarea,
 416         .fb_imageblit   = cfb_imageblit,
 417         .fb_setcolreg   = ep93xxfb_setcolreg,
 418         .fb_mmap        = ep93xxfb_mmap,
 419 };
 420
 421 static int ep93xxfb_alloc_videomem(struct fb_info *info)
 422 {
 423         char __iomem *virt_addr;
 424         dma_addr_t phys_addr;
 425         unsigned int fb_size;
 426
 427         /* Maximum 16bpp -> used memory is maximum x*y*2 bytes */
 428         fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES * 2;
 429
 430         virt_addr = dma_alloc_wc(info->dev, fb_size, &phys_addr, GFP_KERNEL);
 431         if (!virt_addr)
 432                 return -ENOMEM;
 433
 434         /*
 435          * There is a bug in the ep93xx framebuffer which causes problems
 436          * if bit 27 of the physical address is set.
 437          * See: http://marc.info/?l=linux-arm-kernel&m=110061245502000&w=2
 438          * There does not seem to be any official errata for this, but I
 439          * have confirmed the problem exists on my hardware (ep9315) at
 440          * least.
 441          */
 442         if (check_screenpage_bug && phys_addr & (1 << 27)) {
 443                 dev_err(info->dev, "ep93xx framebuffer bug. phys addr (0x%x) "
 444                         "has bit 27 set: cannot init framebuffer\n",
 445                         phys_addr);
 446
 447                 dma_free_coherent(info->dev, fb_size, virt_addr, phys_addr);
 448                 return -ENOMEM;
 449         }
 450
 451         info->fix.smem_start = phys_addr;
 452         info->fix.smem_len = fb_size;
 453         info->screen_base = virt_addr;
 454
 455         return 0;
 456 }
 457
 458 static void ep93xxfb_dealloc_videomem(struct fb_info *info)
 459 {
 460         if (info->screen_base)
 461                 dma_free_coherent(info->dev, info->fix.smem_len,
 462                                   info->screen_base, info->fix.smem_start);
 463 }
 464
 465 static int ep93xxfb_probe(struct platform_device *pdev)
 466 {
 467         struct ep93xxfb_mach_info *mach_info = dev_get_platdata(&pdev->dev);
 468         struct fb_info *info;
 469         struct ep93xx_fbi *fbi;
 470         struct resource *res;
 471         char *video_mode;
 472         int err;
 473
 474         if (!mach_info)
 475                 return -EINVAL;
 476
 477         info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev);
 478         if (!info)
 479                 return -ENOMEM;
 480
 481         info->dev = &pdev->dev;
 482         platform_set_drvdata(pdev, info);
 483         fbi = info->par;
 484         fbi->mach_info = mach_info;
 485
 486         err = fb_alloc_cmap(&info->cmap, 256, 0);
 487         if (err)
 488                 goto failed_cmap;
 489
 490         err = ep93xxfb_alloc_videomem(info);
 491         if (err)
 492                 goto failed_videomem;
 493
 494         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 495         if (!res) {
 496                 err = -ENXIO;
 497                 goto failed_resource;
 498         }
 499
 500         /*
 501          * FIXME - We don't do a request_mem_region here because we are
 502          * sharing the register space with the backlight driver (see
 503          * drivers/video/backlight/ep93xx_bl.c) and doing so will cause
 504          * the second loaded driver to return -EBUSY.
 505          *
 506          * NOTE: No locking is required; the backlight does not touch
 507          * any of the framebuffer registers.
 508          */
 509         fbi->res = res;
 510         fbi->mmio_base = devm_ioremap(&pdev->dev, res->start,
 511                                       resource_size(res));
 512         if (!fbi->mmio_base) {
 513                 err = -ENXIO;
 514                 goto failed_resource;
 515         }
 516
 517         strcpy(info->fix.id, pdev->name);
 518         info->fbops             = &ep93xxfb_ops;
 519         info->fix.type          = FB_TYPE_PACKED_PIXELS;
 520         info->fix.accel         = FB_ACCEL_NONE;
 521         info->var.activate      = FB_ACTIVATE_NOW;
 522         info->var.vmode         = FB_VMODE_NONINTERLACED;
 523         info->flags             = FBINFO_DEFAULT;
 524         info->node              = -1;
 525         info->state             = FBINFO_STATE_RUNNING;
 526         info->pseudo_palette    = &fbi->pseudo_palette;
 527
 528         fb_get_options("ep93xx-fb", &video_mode);
 529         err = fb_find_mode(&info->var, info, video_mode,
 530                            NULL, 0, NULL, 16);
 531         if (err == 0) {
 532                 dev_err(info->dev, "No suitable video mode found\n");
 533                 err = -EINVAL;
 534                 goto failed_resource;
 535         }
 536
 537         if (mach_info->setup) {
 538                 err = mach_info->setup(pdev);
 539                 if (err)
 540                         goto failed_resource;
 541         }
 542
 543         err = ep93xxfb_check_var(&info->var, info);
 544         if (err)
 545                 goto failed_check;
 546
 547         fbi->clk = devm_clk_get(&pdev->dev, NULL);
 548         if (IS_ERR(fbi->clk)) {
 549                 err = PTR_ERR(fbi->clk);
 550                 fbi->clk = NULL;
 551                 goto failed_check;
 552         }
 553
 554         ep93xxfb_set_par(info);
 555         clk_enable(fbi->clk);
 556
 557         err = register_framebuffer(info);
 558         if (err)
 559                 goto failed_check;
 560
 561         dev_info(info->dev, "registered. Mode = %dx%d-%d\n",
 562                  info->var.xres, info->var.yres, info->var.bits_per_pixel);
 563         return 0;
 564
 565 failed_check:
 566         if (fbi->mach_info->teardown)
 567                 fbi->mach_info->teardown(pdev);
 568 failed_resource:
 569         ep93xxfb_dealloc_videomem(info);
 570 failed_videomem:
 571         fb_dealloc_cmap(&info->cmap);
 572 failed_cmap:
 573         kfree(info);
 574
 575         return err;
 576 }
 577
 578 static int ep93xxfb_remove(struct platform_device *pdev)
 579 {
 580         struct fb_info *info = platform_get_drvdata(pdev);
 581         struct ep93xx_fbi *fbi = info->par;
 582
 583         unregister_framebuffer(info);
 584         clk_disable(fbi->clk);
 585         ep93xxfb_dealloc_videomem(info);
 586         fb_dealloc_cmap(&info->cmap);
 587
 588         if (fbi->mach_info->teardown)
 589                 fbi->mach_info->teardown(pdev);
 590
 591         kfree(info);
 592
 593         return 0;
 594 }
 595
 596 static struct platform_driver ep93xxfb_driver = {
 597         .probe          = ep93xxfb_probe,
 598         .remove         = ep93xxfb_remove,
 599         .driver = {
 600                 .name   = "ep93xx-fb",
 601         },
 602 };
 603 module_platform_driver(ep93xxfb_driver);
 604
 605 MODULE_DESCRIPTION("EP93XX Framebuffer Driver");
 606 MODULE_ALIAS("platform:ep93xx-fb");
 607 MODULE_AUTHOR("Ryan Mallon, "
 608               "H Hartley Sweeten <hsweeten@visionengravers.com");
 609 MODULE_LICENSE("GPL");