drivers/video/imxfb.c

   1 /*
   2  *  linux/drivers/video/imxfb.c
   3  *
   4  *  Freescale i.MX Frame Buffer device driver
   5  *
   6  *  Copyright (C) 2004 Sascha Hauer, Pengutronix
   7  *   Based on acornfb.c Copyright (C) Russell King.
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file COPYING in the main directory of this archive for
  11  * more details.
  12  *
  13  * Please direct your questions and comments on this driver to the following
  14  * email address:
  15  *
  16  *      linux-arm-kernel@lists.arm.linux.org.uk
  17  */
  18
  19 //#define DEBUG 1
  20
  21 #include <linux/config.h>
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/sched.h>
  25 #include <linux/errno.h>
  26 #include <linux/string.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/slab.h>
  29 #include <linux/fb.h>
  30 #include <linux/delay.h>
  31 #include <linux/init.h>
  32 #include <linux/ioport.h>
  33 #include <linux/cpufreq.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/dma-mapping.h>
  36
  37 #include <asm/hardware.h>
  38 #include <asm/io.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/arch/imxfb.h>
  41
  42 /*
  43  * Complain if VAR is out of range.
  44  */
  45 #define DEBUG_VAR 1
  46
  47 #include "imxfb.h"
  48
  49 static struct imxfb_rgb def_rgb_16 = {
  50         .red    = { .offset = 8,  .length = 4, },
  51         .green  = { .offset = 4,  .length = 4, },
  52         .blue   = { .offset = 0,  .length = 4, },
  53         .transp = { .offset = 0,  .length = 0, },
  54 };
  55
  56 static struct imxfb_rgb def_rgb_8 = {
  57         .red    = { .offset = 0,  .length = 8, },
  58         .green  = { .offset = 0,  .length = 8, },
  59         .blue   = { .offset = 0,  .length = 8, },
  60         .transp = { .offset = 0,  .length = 0, },
  61 };
  62
  63 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info);
  64
  65 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
  66 {
  67         chan &= 0xffff;
  68         chan >>= 16 - bf->length;
  69         return chan << bf->offset;
  70 }
  71
  72 #define LCDC_PALETTE(x) __REG2(IMX_LCDC_BASE+0x800, (x)<<2)
  73 static int
  74 imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
  75                        u_int trans, struct fb_info *info)
  76 {
  77         struct imxfb_info *fbi = info->par;
  78         u_int val, ret = 1;
  79
  80 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
  81         if (regno < fbi->palette_size) {
  82                 val = (CNVT_TOHW(red, 4) << 8) |
  83                       (CNVT_TOHW(green,4) << 4) |
  84                       CNVT_TOHW(blue,  4);
  85
  86                 LCDC_PALETTE(regno) = val;
  87                 ret = 0;
  88         }
  89         return ret;
  90 }
  91
  92 static int
  93 imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  94                    u_int trans, struct fb_info *info)
  95 {
  96         struct imxfb_info *fbi = info->par;
  97         unsigned int val;
  98         int ret = 1;
  99
 100         /*
 101          * If inverse mode was selected, invert all the colours
 102          * rather than the register number.  The register number
 103          * is what you poke into the framebuffer to produce the
 104          * colour you requested.
 105          */
 106         if (fbi->cmap_inverse) {
 107                 red   = 0xffff - red;
 108                 green = 0xffff - green;
 109                 blue  = 0xffff - blue;
 110         }
 111
 112         /*
 113          * If greyscale is true, then we convert the RGB value
 114          * to greyscale no mater what visual we are using.
 115          */
 116         if (info->var.grayscale)
 117                 red = green = blue = (19595 * red + 38470 * green +
 118                                         7471 * blue) >> 16;
 119
 120         switch (info->fix.visual) {
 121         case FB_VISUAL_TRUECOLOR:
 122                 /*
 123                  * 12 or 16-bit True Colour.  We encode the RGB value
 124                  * according to the RGB bitfield information.
 125                  */
 126                 if (regno < 16) {
 127                         u32 *pal = info->pseudo_palette;
 128
 129                         val  = chan_to_field(red, &info->var.red);
 130                         val |= chan_to_field(green, &info->var.green);
 131                         val |= chan_to_field(blue, &info->var.blue);
 132
 133                         pal[regno] = val;
 134                         ret = 0;
 135                 }
 136                 break;
 137
 138         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 139         case FB_VISUAL_PSEUDOCOLOR:
 140                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
 141                 break;
 142         }
 143
 144         return ret;
 145 }
 146
 147 /*
 148  *  imxfb_check_var():
 149  *    Round up in the following order: bits_per_pixel, xres,
 150  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 151  *    bitfields, horizontal timing, vertical timing.
 152  */
 153 static int
 154 imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 155 {
 156         struct imxfb_info *fbi = info->par;
 157         int rgbidx;
 158
 159         if (var->xres < MIN_XRES)
 160                 var->xres = MIN_XRES;
 161         if (var->yres < MIN_YRES)
 162                 var->yres = MIN_YRES;
 163         if (var->xres > fbi->max_xres)
 164                 var->xres = fbi->max_xres;
 165         if (var->yres > fbi->max_yres)
 166                 var->yres = fbi->max_yres;
 167         var->xres_virtual = max(var->xres_virtual, var->xres);
 168         var->yres_virtual = max(var->yres_virtual, var->yres);
 169
 170         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
 171         switch (var->bits_per_pixel) {
 172         case 16:
 173                 rgbidx = RGB_16;
 174                 break;
 175         case 8:
 176                 rgbidx = RGB_8;
 177                 break;
 178         default:
 179                 rgbidx = RGB_16;
 180         }
 181
 182         /*
 183          * Copy the RGB parameters for this display
 184          * from the machine specific parameters.
 185          */
 186         var->red    = fbi->rgb[rgbidx]->red;
 187         var->green  = fbi->rgb[rgbidx]->green;
 188         var->blue   = fbi->rgb[rgbidx]->blue;
 189         var->transp = fbi->rgb[rgbidx]->transp;
 190
 191         pr_debug("RGBT length = %d:%d:%d:%d\n",
 192                 var->red.length, var->green.length, var->blue.length,
 193                 var->transp.length);
 194
 195         pr_debug("RGBT offset = %d:%d:%d:%d\n",
 196                 var->red.offset, var->green.offset, var->blue.offset,
 197                 var->transp.offset);
 198
 199         return 0;
 200 }
 201
 202 /*
 203  * imxfb_set_par():
 204  *      Set the user defined part of the display for the specified console
 205  */
 206 static int imxfb_set_par(struct fb_info *info)
 207 {
 208         struct imxfb_info *fbi = info->par;
 209         struct fb_var_screeninfo *var = &info->var;
 210
 211         pr_debug("set_par\n");
 212
 213         if (var->bits_per_pixel == 16)
 214                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 215         else if (!fbi->cmap_static)
 216                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 217         else {
 218                 /*
 219                  * Some people have weird ideas about wanting static
 220                  * pseudocolor maps.  I suspect their user space
 221                  * applications are broken.
 222                  */
 223                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 224         }
 225
 226         info->fix.line_length = var->xres_virtual *
 227                                   var->bits_per_pixel / 8;
 228         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 229
 230         imxfb_activate_var(var, info);
 231
 232         return 0;
 233 }
 234
 235 static void imxfb_enable_controller(struct imxfb_info *fbi)
 236 {
 237         pr_debug("Enabling LCD controller\n");
 238
 239         /* initialize LCDC */
 240         LCDC_RMCR &= ~RMCR_LCDC_EN;             /* just to be safe... */
 241
 242         LCDC_SSA        = fbi->screen_dma;
 243         /* physical screen start address            */
 244         LCDC_VPW        = VPW_VPW(fbi->max_xres * fbi->max_bpp / 8 / 4);
 245
 246         LCDC_POS        = 0x00000000;   /* panning offset 0 (0 pixel offset)        */
 247
 248         /* disable hardware cursor */
 249         LCDC_CPOS       &= ~(CPOS_CC0 | CPOS_CC1);
 250
 251         LCDC_RMCR = RMCR_LCDC_EN;
 252
 253         if(fbi->backlight_power)
 254                 fbi->backlight_power(1);
 255         if(fbi->lcd_power)
 256                 fbi->lcd_power(1);
 257 }
 258
 259 static void imxfb_disable_controller(struct imxfb_info *fbi)
 260 {
 261         pr_debug("Disabling LCD controller\n");
 262
 263         if(fbi->backlight_power)
 264                 fbi->backlight_power(0);
 265         if(fbi->lcd_power)
 266                 fbi->lcd_power(0);
 267
 268         LCDC_RMCR = 0;
 269 }
 270
 271 static int imxfb_blank(int blank, struct fb_info *info)
 272 {
 273         struct imxfb_info *fbi = info->par;
 274
 275         pr_debug("imxfb_blank: blank=%d\n", blank);
 276
 277         switch (blank) {
 278         case FB_BLANK_POWERDOWN:
 279         case FB_BLANK_VSYNC_SUSPEND:
 280         case FB_BLANK_HSYNC_SUSPEND:
 281         case FB_BLANK_NORMAL:
 282                 imxfb_disable_controller(fbi);
 283                 break;
 284
 285         case FB_BLANK_UNBLANK:
 286                 imxfb_enable_controller(fbi);
 287                 break;
 288         }
 289         return 0;
 290 }
 291
 292 static struct fb_ops imxfb_ops = {
 293         .owner          = THIS_MODULE,
 294         .fb_check_var   = imxfb_check_var,
 295         .fb_set_par     = imxfb_set_par,
 296         .fb_setcolreg   = imxfb_setcolreg,
 297         .fb_fillrect    = cfb_fillrect,
 298         .fb_copyarea    = cfb_copyarea,
 299         .fb_imageblit   = cfb_imageblit,
 300         .fb_blank       = imxfb_blank,
 301         .fb_cursor      = soft_cursor, /* FIXME: i.MX can do hardware cursor */
 302 };
 303
 304 /*
 305  * imxfb_activate_var():
 306  *      Configures LCD Controller based on entries in var parameter.  Settings are
 307  *      only written to the controller if changes were made.
 308  */
 309 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
 310 {
 311         struct imxfb_info *fbi = info->par;
 312         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 313                 var->xres, var->hsync_len,
 314                 var->left_margin, var->right_margin);
 315         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 316                 var->yres, var->vsync_len,
 317                 var->upper_margin, var->lower_margin);
 318
 319 #if DEBUG_VAR
 320         if (var->xres < 16        || var->xres > 1024)
 321                 printk(KERN_ERR "%s: invalid xres %d\n",
 322                         info->fix.id, var->xres);
 323         if (var->hsync_len < 1    || var->hsync_len > 64)
 324                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 325                         info->fix.id, var->hsync_len);
 326         if (var->left_margin > 255)
 327                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 328                         info->fix.id, var->left_margin);
 329         if (var->right_margin > 255)
 330                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 331                         info->fix.id, var->right_margin);
 332         if (var->yres < 1 || var->yres > 511)
 333                 printk(KERN_ERR "%s: invalid yres %d\n",
 334                         info->fix.id, var->yres);
 335         if (var->vsync_len > 100)
 336                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 337                         info->fix.id, var->vsync_len);
 338         if (var->upper_margin > 63)
 339                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 340                         info->fix.id, var->upper_margin);
 341         if (var->lower_margin > 255)
 342                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 343                         info->fix.id, var->lower_margin);
 344 #endif
 345
 346         LCDC_HCR        = HCR_H_WIDTH(var->hsync_len) |
 347                           HCR_H_WAIT_1(var->left_margin) |
 348                           HCR_H_WAIT_2(var->right_margin);
 349
 350         LCDC_VCR        = VCR_V_WIDTH(var->vsync_len) |
 351                           VCR_V_WAIT_1(var->upper_margin) |
 352                           VCR_V_WAIT_2(var->lower_margin);
 353
 354         LCDC_SIZE       = SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres);
 355         LCDC_PCR        = fbi->pcr;
 356         LCDC_PWMR       = fbi->pwmr;
 357         LCDC_LSCR1      = fbi->lscr1;
 358         LCDC_DMACR      = fbi->dmacr;
 359
 360         return 0;
 361 }
 362
 363 static void imxfb_setup_gpio(struct imxfb_info *fbi)
 364 {
 365         int width;
 366
 367         LCDC_RMCR       &= ~(RMCR_LCDC_EN | RMCR_SELF_REF);
 368
 369         if( fbi->pcr & PCR_TFT )
 370                 width = 16;
 371         else
 372                 width = 1 << ((fbi->pcr >> 28) & 0x3);
 373
 374         switch(width) {
 375         case 16:
 376                 imx_gpio_mode(PD30_PF_LD15);
 377                 imx_gpio_mode(PD29_PF_LD14);
 378                 imx_gpio_mode(PD28_PF_LD13);
 379                 imx_gpio_mode(PD27_PF_LD12);
 380                 imx_gpio_mode(PD26_PF_LD11);
 381                 imx_gpio_mode(PD25_PF_LD10);
 382                 imx_gpio_mode(PD24_PF_LD9);
 383                 imx_gpio_mode(PD23_PF_LD8);
 384         case 8:
 385                 imx_gpio_mode(PD22_PF_LD7);
 386                 imx_gpio_mode(PD21_PF_LD6);
 387                 imx_gpio_mode(PD20_PF_LD5);
 388                 imx_gpio_mode(PD19_PF_LD4);
 389         case 4:
 390                 imx_gpio_mode(PD18_PF_LD3);
 391                 imx_gpio_mode(PD17_PF_LD2);
 392         case 2:
 393                 imx_gpio_mode(PD16_PF_LD1);
 394         case 1:
 395                 imx_gpio_mode(PD15_PF_LD0);
 396         }
 397
 398         /* initialize GPIOs */
 399         imx_gpio_mode(PD6_PF_LSCLK);
 400         imx_gpio_mode(PD10_PF_SPL_SPR);
 401         imx_gpio_mode(PD11_PF_CONTRAST);
 402         imx_gpio_mode(PD14_PF_FLM_VSYNC);
 403         imx_gpio_mode(PD13_PF_LP_HSYNC);
 404         imx_gpio_mode(PD7_PF_REV);
 405         imx_gpio_mode(PD8_PF_CLS);
 406
 407 #ifndef CONFIG_MACH_PIMX1
 408         /* on PiMX1 used as buffers enable signal
 409          */
 410         imx_gpio_mode(PD9_PF_PS);
 411 #endif
 412
 413 #ifndef CONFIG_MACH_MX1FS2
 414         /* on mx1fs2 this pin is used to (de)activate the display, so we need
 415          * it as a normal gpio
 416          */
 417         imx_gpio_mode(PD12_PF_ACD_OE);
 418 #endif
 419
 420 }
 421
 422 #ifdef CONFIG_PM
 423 /*
 424  * Power management hooks.  Note that we won't be called from IRQ context,
 425  * unlike the blank functions above, so we may sleep.
 426  */
 427 static int imxfb_suspend(struct device *dev, pm_message_t state)
 428 {
 429         struct imxfb_info *fbi = dev_get_drvdata(dev);
 430         pr_debug("%s\n",__FUNCTION__);
 431
 432         imxfb_disable_controller(fbi);
 433         return 0;
 434 }
 435
 436 static int imxfb_resume(struct device *dev)
 437 {
 438         struct imxfb_info *fbi = dev_get_drvdata(dev);
 439         pr_debug("%s\n",__FUNCTION__);
 440
 441         imxfb_enable_controller(fbi);
 442         return 0;
 443 }
 444 #else
 445 #define imxfb_suspend   NULL
 446 #define imxfb_resume    NULL
 447 #endif
 448
 449 static int __init imxfb_init_fbinfo(struct device *dev)
 450 {
 451         struct imxfb_mach_info *inf = dev->platform_data;
 452         struct fb_info *info = dev_get_drvdata(dev);
 453         struct imxfb_info *fbi = info->par;
 454
 455         pr_debug("%s\n",__FUNCTION__);
 456
 457         info->pseudo_palette = kmalloc( sizeof(u32) * 16, GFP_KERNEL);
 458         if (!info->pseudo_palette)
 459                 return -ENOMEM;
 460
 461         memset(fbi, 0, sizeof(struct imxfb_info));
 462         fbi->dev = dev;
 463
 464         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 465
 466         info->fix.type  = FB_TYPE_PACKED_PIXELS;
 467         info->fix.type_aux              = 0;
 468         info->fix.xpanstep              = 0;
 469         info->fix.ypanstep              = 0;
 470         info->fix.ywrapstep             = 0;
 471         info->fix.accel = FB_ACCEL_NONE;
 472
 473         info->var.nonstd                = 0;
 474         info->var.activate              = FB_ACTIVATE_NOW;
 475         info->var.height                = -1;
 476         info->var.width = -1;
 477         info->var.accel_flags           = 0;
 478         info->var.vmode = FB_VMODE_NONINTERLACED;
 479
 480         info->fbops                     = &imxfb_ops;
 481         info->flags                     = FBINFO_FLAG_DEFAULT;
 482         info->pseudo_palette            = (fbi + 1);
 483
 484         fbi->rgb[RGB_16]                = &def_rgb_16;
 485         fbi->rgb[RGB_8]                 = &def_rgb_8;
 486
 487         fbi->max_xres                   = inf->xres;
 488         info->var.xres                  = inf->xres;
 489         info->var.xres_virtual          = inf->xres;
 490         fbi->max_yres                   = inf->yres;
 491         info->var.yres                  = inf->yres;
 492         info->var.yres_virtual          = inf->yres;
 493         fbi->max_bpp                    = inf->bpp;
 494         info->var.bits_per_pixel        = inf->bpp;
 495         info->var.pixclock              = inf->pixclock;
 496         info->var.hsync_len             = inf->hsync_len;
 497         info->var.left_margin           = inf->left_margin;
 498         info->var.right_margin          = inf->right_margin;
 499         info->var.vsync_len             = inf->vsync_len;
 500         info->var.upper_margin          = inf->upper_margin;
 501         info->var.lower_margin          = inf->lower_margin;
 502         info->var.sync                  = inf->sync;
 503         info->var.grayscale             = inf->cmap_greyscale;
 504         fbi->cmap_inverse               = inf->cmap_inverse;
 505         fbi->pcr                        = inf->pcr;
 506         fbi->lscr1                      = inf->lscr1;
 507         fbi->dmacr                      = inf->dmacr;
 508         fbi->pwmr                       = inf->pwmr;
 509         fbi->lcd_power                  = inf->lcd_power;
 510         fbi->backlight_power            = inf->backlight_power;
 511         info->fix.smem_len              = fbi->max_xres * fbi->max_yres *
 512                                           fbi->max_bpp / 8;
 513
 514         return 0;
 515 }
 516
 517 /*
 518  *      Allocates the DRAM memory for the frame buffer.  This buffer is
 519  *      remapped into a non-cached, non-buffered, memory region to
 520  *      allow pixel writes to occur without flushing the cache.
 521  *      Once this area is remapped, all virtual memory access to the
 522  *      video memory should occur at the new region.
 523  */
 524 static int __init imxfb_map_video_memory(struct fb_info *info)
 525 {
 526         struct imxfb_info *fbi = info->par;
 527
 528         fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
 529         fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
 530                                         &fbi->map_dma,GFP_KERNEL);
 531
 532         if (fbi->map_cpu) {
 533                 info->screen_base = fbi->map_cpu;
 534                 fbi->screen_cpu = fbi->map_cpu;
 535                 fbi->screen_dma = fbi->map_dma;
 536                 info->fix.smem_start = fbi->screen_dma;
 537         }
 538
 539         return fbi->map_cpu ? 0 : -ENOMEM;
 540 }
 541
 542 static int __init imxfb_probe(struct device *dev)
 543 {
 544         struct platform_device *pdev = to_platform_device(dev);
 545         struct imxfb_info *fbi;
 546         struct fb_info *info;
 547         struct imxfb_mach_info *inf;
 548         struct resource *res;
 549         int ret;
 550
 551         printk("i.MX Framebuffer driver\n");
 552
 553         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 554         if(!res)
 555                 return -ENODEV;
 556
 557         inf = dev->platform_data;
 558         if(!inf) {
 559                 dev_err(dev,"No platform_data available\n");
 560                 return -ENOMEM;
 561         }
 562
 563         info = framebuffer_alloc(sizeof(struct imxfb_info), dev);
 564         if(!info)
 565                 return -ENOMEM;
 566
 567         fbi = info->par;
 568
 569         dev_set_drvdata(dev, info);
 570
 571         ret = imxfb_init_fbinfo(dev);
 572         if( ret < 0 )
 573                 goto failed_init;
 574
 575         res = request_mem_region(res->start, res->end - res->start + 1, "IMXFB");
 576         if (!res) {
 577                 ret = -EBUSY;
 578                 goto failed_regs;
 579         }
 580
 581         if (!inf->fixed_screen_cpu) {
 582                 ret = imxfb_map_video_memory(info);
 583                 if (ret) {
 584                         dev_err(dev, "Failed to allocate video RAM: %d\n", ret);
 585                         ret = -ENOMEM;
 586                         goto failed_map;
 587                 }
 588         } else {
 589                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
 590                 fbi->map_cpu = inf->fixed_screen_cpu;
 591                 fbi->map_dma = inf->fixed_screen_dma;
 592                 info->screen_base = fbi->map_cpu;
 593                 fbi->screen_cpu = fbi->map_cpu;
 594                 fbi->screen_dma = fbi->map_dma;
 595                 info->fix.smem_start = fbi->screen_dma;
 596         }
 597
 598         /*
 599          * This makes sure that our colour bitfield
 600          * descriptors are correctly initialised.
 601          */
 602         imxfb_check_var(&info->var, info);
 603
 604         ret = fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
 605         if (ret < 0)
 606                 goto failed_cmap;
 607
 608         imxfb_setup_gpio(fbi);
 609
 610         imxfb_set_par(info);
 611         ret = register_framebuffer(info);
 612         if (ret < 0) {
 613                 dev_err(dev, "failed to register framebuffer\n");
 614                 goto failed_register;
 615         }
 616
 617         imxfb_enable_controller(fbi);
 618
 619         return 0;
 620
 621 failed_register:
 622         fb_dealloc_cmap(&info->cmap);
 623 failed_cmap:
 624         if (!inf->fixed_screen_cpu)
 625                 dma_free_writecombine(dev,fbi->map_size,fbi->map_cpu,
 626                            fbi->map_dma);
 627 failed_map:
 628         kfree(info->pseudo_palette);
 629 failed_regs:
 630         release_mem_region(res->start, res->end - res->start);
 631 failed_init:
 632         dev_set_drvdata(dev, NULL);
 633         framebuffer_release(info);
 634         return ret;
 635 }
 636
 637 static int imxfb_remove(struct device *dev)
 638 {
 639         struct platform_device *pdev = to_platform_device(dev);
 640         struct fb_info *info = dev_get_drvdata(dev);
 641         struct imxfb_info *fbi = info->par;
 642         struct resource *res;
 643
 644         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 645
 646         imxfb_disable_controller(fbi);
 647
 648         unregister_framebuffer(info);
 649
 650         fb_dealloc_cmap(&info->cmap);
 651         kfree(info->pseudo_palette);
 652         framebuffer_release(info);
 653
 654         release_mem_region(res->start, res->end - res->start + 1);
 655         dev_set_drvdata(dev, NULL);
 656
 657         return 0;
 658 }
 659
 660 void  imxfb_shutdown(struct device * dev)
 661 {
 662         struct fb_info *info = dev_get_drvdata(dev);
 663         struct imxfb_info *fbi = info->par;
 664         imxfb_disable_controller(fbi);
 665 }
 666
 667 static struct device_driver imxfb_driver = {
 668         .name           = "imx-fb",
 669         .bus            = &platform_bus_type,
 670         .probe          = imxfb_probe,
 671         .suspend        = imxfb_suspend,
 672         .resume         = imxfb_resume,
 673         .remove         = imxfb_remove,
 674         .shutdown       = imxfb_shutdown,
 675 };
 676
 677 int __init imxfb_init(void)
 678 {
 679         return driver_register(&imxfb_driver);
 680 }
 681
 682 static void __exit imxfb_cleanup(void)
 683 {
 684         driver_unregister(&imxfb_driver);
 685 }
 686
 687 module_init(imxfb_init);
 688 module_exit(imxfb_cleanup);
 689
 690 MODULE_DESCRIPTION("Motorola i.MX framebuffer driver");
 691 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 692 MODULE_LICENSE("GPL");