git.oblomov.eu Git - linux-2.6/blob - drivers/video/imxfb.c

   1 /*
   2  *  Freescale i.MX Frame Buffer device driver
   3  *
   4  *  Copyright (C) 2004 Sascha Hauer, Pengutronix
   5  *   Based on acornfb.c Copyright (C) Russell King.
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file COPYING in the main directory of this archive for
   9  * more details.
  10  *
  11  * Please direct your questions and comments on this driver to the following
  12  * email address:
  13  *
  14  *      linux-arm-kernel@lists.arm.linux.org.uk
  15  */
  16
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/errno.h>
  21 #include <linux/string.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/slab.h>
  24 #include <linux/mm.h>
  25 #include <linux/fb.h>
  26 #include <linux/delay.h>
  27 #include <linux/init.h>
  28 #include <linux/ioport.h>
  29 #include <linux/cpufreq.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/dma-mapping.h>
  32 #include <linux/io.h>
  33
  34 #include <mach/imxfb.h>
  35
  36 /*
  37  * Complain if VAR is out of range.
  38  */
  39 #define DEBUG_VAR 1
  40
  41 #define DRIVER_NAME "imx-fb"
  42
  43 #define LCDC_SSA        0x00
  44
  45 #define LCDC_SIZE       0x04
  46 #define SIZE_XMAX(x)    ((((x) >> 4) & 0x3f) << 20)
  47 #define SIZE_YMAX(y)    ((y) & 0x1ff)
  48
  49 #define LCDC_VPW        0x08
  50 #define VPW_VPW(x)      ((x) & 0x3ff)
  51
  52 #define LCDC_CPOS       0x0C
  53 #define CPOS_CC1        (1<<31)
  54 #define CPOS_CC0        (1<<30)
  55 #define CPOS_OP         (1<<28)
  56 #define CPOS_CXP(x)     (((x) & 3ff) << 16)
  57 #define CPOS_CYP(y)     ((y) & 0x1ff)
  58
  59 #define LCDC_LCWHB      0x10
  60 #define LCWHB_BK_EN     (1<<31)
  61 #define LCWHB_CW(w)     (((w) & 0x1f) << 24)
  62 #define LCWHB_CH(h)     (((h) & 0x1f) << 16)
  63 #define LCWHB_BD(x)     ((x) & 0xff)
  64
  65 #define LCDC_LCHCC      0x14
  66 #define LCHCC_CUR_COL_R(r) (((r) & 0x1f) << 11)
  67 #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 5)
  68 #define LCHCC_CUR_COL_B(b) ((b) & 0x1f)
  69
  70 #define LCDC_PCR        0x18
  71
  72 #define LCDC_HCR        0x1C
  73 #define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
  74 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
  75 #define HCR_H_WAIT_2(x) ((x) & 0xff)
  76
  77 #define LCDC_VCR        0x20
  78 #define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
  79 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
  80 #define VCR_V_WAIT_2(x) ((x) & 0xff)
  81
  82 #define LCDC_POS        0x24
  83 #define POS_POS(x)      ((x) & 1f)
  84
  85 #define LCDC_LSCR1      0x28
  86 /* bit fields in imxfb.h */
  87
  88 #define LCDC_PWMR       0x2C
  89 /* bit fields in imxfb.h */
  90
  91 #define LCDC_DMACR      0x30
  92 /* bit fields in imxfb.h */
  93
  94 #define LCDC_RMCR       0x34
  95 #define RMCR_LCDC_EN    (1<<1)
  96 #define RMCR_SELF_REF   (1<<0)
  97
  98 #define LCDC_LCDICR     0x38
  99 #define LCDICR_INT_SYN  (1<<2)
 100 #define LCDICR_INT_CON  (1)
 101
 102 #define LCDC_LCDISR     0x40
 103 #define LCDISR_UDR_ERR  (1<<3)
 104 #define LCDISR_ERR_RES  (1<<2)
 105 #define LCDISR_EOF      (1<<1)
 106 #define LCDISR_BOF      (1<<0)
 107
 108 /*
 109  * These are the bitfields for each
 110  * display depth that we support.
 111  */
 112 struct imxfb_rgb {
 113         struct fb_bitfield      red;
 114         struct fb_bitfield      green;
 115         struct fb_bitfield      blue;
 116         struct fb_bitfield      transp;
 117 };
 118
 119 struct imxfb_info {
 120         struct platform_device  *pdev;
 121         void __iomem            *regs;
 122
 123         u_int                   max_bpp;
 124         u_int                   max_xres;
 125         u_int                   max_yres;
 126
 127         /*
 128          * These are the addresses we mapped
 129          * the framebuffer memory region to.
 130          */
 131         dma_addr_t              map_dma;
 132         u_char                  *map_cpu;
 133         u_int                   map_size;
 134
 135         u_char                  *screen_cpu;
 136         dma_addr_t              screen_dma;
 137         u_int                   palette_size;
 138
 139         dma_addr_t              dbar1;
 140         dma_addr_t              dbar2;
 141
 142         u_int                   pcr;
 143         u_int                   pwmr;
 144         u_int                   lscr1;
 145         u_int                   dmacr;
 146         u_int                   cmap_inverse:1,
 147                                 cmap_static:1,
 148                                 unused:30;
 149
 150         void (*lcd_power)(int);
 151         void (*backlight_power)(int);
 152 };
 153
 154 #define IMX_NAME        "IMX"
 155
 156 /*
 157  * Minimum X and Y resolutions
 158  */
 159 #define MIN_XRES        64
 160 #define MIN_YRES        64
 161
 162 static struct imxfb_rgb def_rgb_16_tft = {
 163         .red    = {.offset = 11, .length = 5,},
 164         .green  = {.offset = 5, .length = 6,},
 165         .blue   = {.offset = 0, .length = 5,},
 166         .transp = {.offset = 0, .length = 0,},
 167 };
 168
 169 static struct imxfb_rgb def_rgb_16_stn = {
 170         .red    = {.offset = 8, .length = 4,},
 171         .green  = {.offset = 4, .length = 4,},
 172         .blue   = {.offset = 0, .length = 4,},
 173         .transp = {.offset = 0, .length = 0,},
 174 };
 175
 176 static struct imxfb_rgb def_rgb_8 = {
 177         .red    = {.offset = 0, .length = 8,},
 178         .green  = {.offset = 0, .length = 8,},
 179         .blue   = {.offset = 0, .length = 8,},
 180         .transp = {.offset = 0, .length = 0,},
 181 };
 182
 183 static int imxfb_activate_var(struct fb_var_screeninfo *var,
 184                 struct fb_info *info);
 185
 186 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 187 {
 188         chan &= 0xffff;
 189         chan >>= 16 - bf->length;
 190         return chan << bf->offset;
 191 }
 192
 193 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
 194                 u_int trans, struct fb_info *info)
 195 {
 196         struct imxfb_info *fbi = info->par;
 197         u_int val, ret = 1;
 198
 199 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
 200         if (regno < fbi->palette_size) {
 201                 val = (CNVT_TOHW(red, 4) << 8) |
 202                       (CNVT_TOHW(green,4) << 4) |
 203                       CNVT_TOHW(blue,  4);
 204
 205                 writel(val, fbi->regs + 0x800 + (regno << 2));
 206                 ret = 0;
 207         }
 208         return ret;
 209 }
 210
 211 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 212                    u_int trans, struct fb_info *info)
 213 {
 214         struct imxfb_info *fbi = info->par;
 215         unsigned int val;
 216         int ret = 1;
 217
 218         /*
 219          * If inverse mode was selected, invert all the colours
 220          * rather than the register number.  The register number
 221          * is what you poke into the framebuffer to produce the
 222          * colour you requested.
 223          */
 224         if (fbi->cmap_inverse) {
 225                 red   = 0xffff - red;
 226                 green = 0xffff - green;
 227                 blue  = 0xffff - blue;
 228         }
 229
 230         /*
 231          * If greyscale is true, then we convert the RGB value
 232          * to greyscale no mater what visual we are using.
 233          */
 234         if (info->var.grayscale)
 235                 red = green = blue = (19595 * red + 38470 * green +
 236                                         7471 * blue) >> 16;
 237
 238         switch (info->fix.visual) {
 239         case FB_VISUAL_TRUECOLOR:
 240                 /*
 241                  * 12 or 16-bit True Colour.  We encode the RGB value
 242                  * according to the RGB bitfield information.
 243                  */
 244                 if (regno < 16) {
 245                         u32 *pal = info->pseudo_palette;
 246
 247                         val  = chan_to_field(red, &info->var.red);
 248                         val |= chan_to_field(green, &info->var.green);
 249                         val |= chan_to_field(blue, &info->var.blue);
 250
 251                         pal[regno] = val;
 252                         ret = 0;
 253                 }
 254                 break;
 255
 256         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 257         case FB_VISUAL_PSEUDOCOLOR:
 258                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
 259                 break;
 260         }
 261
 262         return ret;
 263 }
 264
 265 /*
 266  *  imxfb_check_var():
 267  *    Round up in the following order: bits_per_pixel, xres,
 268  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 269  *    bitfields, horizontal timing, vertical timing.
 270  */
 271 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 272 {
 273         struct imxfb_info *fbi = info->par;
 274         struct imxfb_rgb *rgb;
 275
 276         if (var->xres < MIN_XRES)
 277                 var->xres = MIN_XRES;
 278         if (var->yres < MIN_YRES)
 279                 var->yres = MIN_YRES;
 280         if (var->xres > fbi->max_xres)
 281                 var->xres = fbi->max_xres;
 282         if (var->yres > fbi->max_yres)
 283                 var->yres = fbi->max_yres;
 284         var->xres_virtual = max(var->xres_virtual, var->xres);
 285         var->yres_virtual = max(var->yres_virtual, var->yres);
 286
 287         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
 288         switch (var->bits_per_pixel) {
 289         case 16:
 290         default:
 291                 if (readl(fbi->regs + LCDC_PCR) & PCR_TFT)
 292                         rgb = &def_rgb_16_tft;
 293                 else
 294                         rgb = &def_rgb_16_stn;
 295                 break;
 296         case 8:
 297                 rgb = &def_rgb_8;
 298                 break;
 299         }
 300
 301         /*
 302          * Copy the RGB parameters for this display
 303          * from the machine specific parameters.
 304          */
 305         var->red    = rgb->red;
 306         var->green  = rgb->green;
 307         var->blue   = rgb->blue;
 308         var->transp = rgb->transp;
 309
 310         pr_debug("RGBT length = %d:%d:%d:%d\n",
 311                 var->red.length, var->green.length, var->blue.length,
 312                 var->transp.length);
 313
 314         pr_debug("RGBT offset = %d:%d:%d:%d\n",
 315                 var->red.offset, var->green.offset, var->blue.offset,
 316                 var->transp.offset);
 317
 318         return 0;
 319 }
 320
 321 /*
 322  * imxfb_set_par():
 323  *      Set the user defined part of the display for the specified console
 324  */
 325 static int imxfb_set_par(struct fb_info *info)
 326 {
 327         struct imxfb_info *fbi = info->par;
 328         struct fb_var_screeninfo *var = &info->var;
 329
 330         pr_debug("set_par\n");
 331
 332         if (var->bits_per_pixel == 16)
 333                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 334         else if (!fbi->cmap_static)
 335                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 336         else {
 337                 /*
 338                  * Some people have weird ideas about wanting static
 339                  * pseudocolor maps.  I suspect their user space
 340                  * applications are broken.
 341                  */
 342                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 343         }
 344
 345         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
 346         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 347
 348         imxfb_activate_var(var, info);
 349
 350         return 0;
 351 }
 352
 353 static void imxfb_enable_controller(struct imxfb_info *fbi)
 354 {
 355         pr_debug("Enabling LCD controller\n");
 356
 357         /* initialize LCDC */
 358         writel(readl(fbi->regs + LCDC_RMCR) & ~RMCR_LCDC_EN,
 359                 fbi->regs + LCDC_RMCR); /* just to be safe... */
 360
 361         writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
 362
 363         /* physical screen start address            */
 364         writel(VPW_VPW(fbi->max_xres * fbi->max_bpp / 8 / 4),
 365                 fbi->regs + LCDC_VPW);
 366
 367         /* panning offset 0 (0 pixel offset)        */
 368         writel(0x00000000, fbi->regs + LCDC_POS);
 369
 370         /* disable hardware cursor */
 371         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
 372                 fbi->regs + LCDC_CPOS);
 373
 374         writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR);
 375
 376         if (fbi->backlight_power)
 377                 fbi->backlight_power(1);
 378         if (fbi->lcd_power)
 379                 fbi->lcd_power(1);
 380 }
 381
 382 static void imxfb_disable_controller(struct imxfb_info *fbi)
 383 {
 384         pr_debug("Disabling LCD controller\n");
 385
 386         if (fbi->backlight_power)
 387                 fbi->backlight_power(0);
 388         if (fbi->lcd_power)
 389                 fbi->lcd_power(0);
 390
 391         writel(0, fbi->regs + LCDC_RMCR);
 392 }
 393
 394 static int imxfb_blank(int blank, struct fb_info *info)
 395 {
 396         struct imxfb_info *fbi = info->par;
 397
 398         pr_debug("imxfb_blank: blank=%d\n", blank);
 399
 400         switch (blank) {
 401         case FB_BLANK_POWERDOWN:
 402         case FB_BLANK_VSYNC_SUSPEND:
 403         case FB_BLANK_HSYNC_SUSPEND:
 404         case FB_BLANK_NORMAL:
 405                 imxfb_disable_controller(fbi);
 406                 break;
 407
 408         case FB_BLANK_UNBLANK:
 409                 imxfb_enable_controller(fbi);
 410                 break;
 411         }
 412         return 0;
 413 }
 414
 415 static struct fb_ops imxfb_ops = {
 416         .owner          = THIS_MODULE,
 417         .fb_check_var   = imxfb_check_var,
 418         .fb_set_par     = imxfb_set_par,
 419         .fb_setcolreg   = imxfb_setcolreg,
 420         .fb_fillrect    = cfb_fillrect,
 421         .fb_copyarea    = cfb_copyarea,
 422         .fb_imageblit   = cfb_imageblit,
 423         .fb_blank       = imxfb_blank,
 424 };
 425
 426 /*
 427  * imxfb_activate_var():
 428  *      Configures LCD Controller based on entries in var parameter.  Settings are
 429  *      only written to the controller if changes were made.
 430  */
 431 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
 432 {
 433         struct imxfb_info *fbi = info->par;
 434         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 435                 var->xres, var->hsync_len,
 436                 var->left_margin, var->right_margin);
 437         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 438                 var->yres, var->vsync_len,
 439                 var->upper_margin, var->lower_margin);
 440
 441 #if DEBUG_VAR
 442         if (var->xres < 16        || var->xres > 1024)
 443                 printk(KERN_ERR "%s: invalid xres %d\n",
 444                         info->fix.id, var->xres);
 445         if (var->hsync_len < 1    || var->hsync_len > 64)
 446                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 447                         info->fix.id, var->hsync_len);
 448         if (var->left_margin > 255)
 449                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 450                         info->fix.id, var->left_margin);
 451         if (var->right_margin > 255)
 452                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 453                         info->fix.id, var->right_margin);
 454         if (var->yres < 1 || var->yres > 511)
 455                 printk(KERN_ERR "%s: invalid yres %d\n",
 456                         info->fix.id, var->yres);
 457         if (var->vsync_len > 100)
 458                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 459                         info->fix.id, var->vsync_len);
 460         if (var->upper_margin > 63)
 461                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 462                         info->fix.id, var->upper_margin);
 463         if (var->lower_margin > 255)
 464                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 465                         info->fix.id, var->lower_margin);
 466 #endif
 467
 468         writel(HCR_H_WIDTH(var->hsync_len) |
 469                 HCR_H_WAIT_1(var->right_margin) |
 470                 HCR_H_WAIT_2(var->left_margin),
 471                 fbi->regs + LCDC_HCR);
 472
 473         writel(VCR_V_WIDTH(var->vsync_len) |
 474                 VCR_V_WAIT_1(var->lower_margin) |
 475                 VCR_V_WAIT_2(var->upper_margin),
 476                 fbi->regs + LCDC_VCR);
 477
 478         writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
 479                         fbi->regs + LCDC_SIZE);
 480         writel(fbi->pcr, fbi->regs + LCDC_PCR);
 481         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 482         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
 483         writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
 484
 485         return 0;
 486 }
 487
 488 #ifdef CONFIG_PM
 489 /*
 490  * Power management hooks.  Note that we won't be called from IRQ context,
 491  * unlike the blank functions above, so we may sleep.
 492  */
 493 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
 494 {
 495         struct imxfb_info *fbi = platform_get_drvdata(dev);
 496
 497         pr_debug("%s\n", __func__);
 498
 499         imxfb_disable_controller(fbi);
 500         return 0;
 501 }
 502
 503 static int imxfb_resume(struct platform_device *dev)
 504 {
 505         struct imxfb_info *fbi = platform_get_drvdata(dev);
 506
 507         pr_debug("%s\n", __func__);
 508
 509         imxfb_enable_controller(fbi);
 510         return 0;
 511 }
 512 #else
 513 #define imxfb_suspend   NULL
 514 #define imxfb_resume    NULL
 515 #endif
 516
 517 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
 518 {
 519         struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
 520         struct fb_info *info = dev_get_drvdata(&pdev->dev);
 521         struct imxfb_info *fbi = info->par;
 522
 523         pr_debug("%s\n",__func__);
 524
 525         info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
 526         if (!info->pseudo_palette)
 527                 return -ENOMEM;
 528
 529         memset(fbi, 0, sizeof(struct imxfb_info));
 530
 531         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 532
 533         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
 534         info->fix.type_aux              = 0;
 535         info->fix.xpanstep              = 0;
 536         info->fix.ypanstep              = 0;
 537         info->fix.ywrapstep             = 0;
 538         info->fix.accel                 = FB_ACCEL_NONE;
 539
 540         info->var.nonstd                = 0;
 541         info->var.activate              = FB_ACTIVATE_NOW;
 542         info->var.height                = -1;
 543         info->var.width = -1;
 544         info->var.accel_flags           = 0;
 545         info->var.vmode                 = FB_VMODE_NONINTERLACED;
 546
 547         info->fbops                     = &imxfb_ops;
 548         info->flags                     = FBINFO_FLAG_DEFAULT |
 549                                           FBINFO_READS_FAST;
 550
 551         fbi->max_xres                   = pdata->xres;
 552         info->var.xres                  = pdata->xres;
 553         info->var.xres_virtual          = pdata->xres;
 554         fbi->max_yres                   = pdata->yres;
 555         info->var.yres                  = pdata->yres;
 556         info->var.yres_virtual          = pdata->yres;
 557         fbi->max_bpp                    = pdata->bpp;
 558         info->var.bits_per_pixel        = pdata->bpp;
 559         info->var.nonstd                = pdata->nonstd;
 560         info->var.pixclock              = pdata->pixclock;
 561         info->var.hsync_len             = pdata->hsync_len;
 562         info->var.left_margin           = pdata->left_margin;
 563         info->var.right_margin          = pdata->right_margin;
 564         info->var.vsync_len             = pdata->vsync_len;
 565         info->var.upper_margin          = pdata->upper_margin;
 566         info->var.lower_margin          = pdata->lower_margin;
 567         info->var.sync                  = pdata->sync;
 568         info->var.grayscale             = pdata->cmap_greyscale;
 569         fbi->cmap_inverse               = pdata->cmap_inverse;
 570         fbi->cmap_static                = pdata->cmap_static;
 571         fbi->pcr                        = pdata->pcr;
 572         fbi->lscr1                      = pdata->lscr1;
 573         fbi->dmacr                      = pdata->dmacr;
 574         fbi->pwmr                       = pdata->pwmr;
 575         fbi->lcd_power                  = pdata->lcd_power;
 576         fbi->backlight_power            = pdata->backlight_power;
 577         info->fix.smem_len              = fbi->max_xres * fbi->max_yres *
 578                                           fbi->max_bpp / 8;
 579
 580         return 0;
 581 }
 582
 583 static int __init imxfb_probe(struct platform_device *pdev)
 584 {
 585         struct imxfb_info *fbi;
 586         struct fb_info *info;
 587         struct imx_fb_platform_data *pdata;
 588         struct resource *res;
 589         int ret;
 590
 591         printk("i.MX Framebuffer driver\n");
 592
 593         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 594         if (!res)
 595                 return -ENODEV;
 596
 597         pdata = pdev->dev.platform_data;
 598         if (!pdata) {
 599                 dev_err(&pdev->dev,"No platform_data available\n");
 600                 return -ENOMEM;
 601         }
 602
 603         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
 604         if (!info)
 605                 return -ENOMEM;
 606
 607         fbi = info->par;
 608
 609         platform_set_drvdata(pdev, info);
 610
 611         ret = imxfb_init_fbinfo(pdev);
 612         if (ret < 0)
 613                 goto failed_init;
 614
 615         res = request_mem_region(res->start, resource_size(res),
 616                                 DRIVER_NAME);
 617         if (!res) {
 618                 ret = -EBUSY;
 619                 goto failed_req;
 620         }
 621
 622         fbi->regs = ioremap(res->start, resource_size(res));
 623         if (fbi->regs == NULL) {
 624                 printk(KERN_ERR"Cannot map frame buffer registers\n");
 625                 goto failed_ioremap;
 626         }
 627
 628         if (!pdata->fixed_screen_cpu) {
 629                 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
 630                 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
 631                                 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
 632
 633                 if (!fbi->map_cpu) {
 634                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
 635                         ret = -ENOMEM;
 636                         goto failed_map;
 637                 }
 638
 639                 info->screen_base = fbi->map_cpu;
 640                 fbi->screen_cpu = fbi->map_cpu;
 641                 fbi->screen_dma = fbi->map_dma;
 642                 info->fix.smem_start = fbi->screen_dma;
 643         } else {
 644                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
 645                 fbi->map_cpu = pdata->fixed_screen_cpu;
 646                 fbi->map_dma = pdata->fixed_screen_dma;
 647                 info->screen_base = fbi->map_cpu;
 648                 fbi->screen_cpu = fbi->map_cpu;
 649                 fbi->screen_dma = fbi->map_dma;
 650                 info->fix.smem_start = fbi->screen_dma;
 651         }
 652
 653         /*
 654          * This makes sure that our colour bitfield
 655          * descriptors are correctly initialised.
 656          */
 657         imxfb_check_var(&info->var, info);
 658
 659         ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
 660         if (ret < 0)
 661                 goto failed_cmap;
 662
 663         imxfb_set_par(info);
 664         ret = register_framebuffer(info);
 665         if (ret < 0) {
 666                 dev_err(&pdev->dev, "failed to register framebuffer\n");
 667                 goto failed_register;
 668         }
 669
 670         imxfb_enable_controller(fbi);
 671
 672         return 0;
 673
 674 failed_register:
 675         fb_dealloc_cmap(&info->cmap);
 676 failed_cmap:
 677         if (!pdata->fixed_screen_cpu)
 678                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
 679                         fbi->map_dma);
 680 failed_map:
 681         iounmap(fbi->regs);
 682 failed_ioremap:
 683         release_mem_region(res->start, res->end - res->start);
 684 failed_req:
 685         kfree(info->pseudo_palette);
 686 failed_init:
 687         platform_set_drvdata(pdev, NULL);
 688         framebuffer_release(info);
 689         return ret;
 690 }
 691
 692 static int __devexit imxfb_remove(struct platform_device *pdev)
 693 {
 694         struct fb_info *info = platform_get_drvdata(pdev);
 695         struct imxfb_info *fbi = info->par;
 696         struct resource *res;
 697
 698         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 699
 700         imxfb_disable_controller(fbi);
 701
 702         unregister_framebuffer(info);
 703
 704         fb_dealloc_cmap(&info->cmap);
 705         kfree(info->pseudo_palette);
 706         framebuffer_release(info);
 707
 708         iounmap(fbi->regs);
 709         release_mem_region(res->start, res->end - res->start + 1);
 710         platform_set_drvdata(pdev, NULL);
 711
 712         return 0;
 713 }
 714
 715 void  imxfb_shutdown(struct platform_device * dev)
 716 {
 717         struct fb_info *info = platform_get_drvdata(dev);
 718         struct imxfb_info *fbi = info->par;
 719         imxfb_disable_controller(fbi);
 720 }
 721
 722 static struct platform_driver imxfb_driver = {
 723         .suspend        = imxfb_suspend,
 724         .resume         = imxfb_resume,
 725         .remove         = __devexit_p(imxfb_remove),
 726         .shutdown       = imxfb_shutdown,
 727         .driver         = {
 728                 .name   = DRIVER_NAME,
 729         },
 730 };
 731
 732 int __init imxfb_init(void)
 733 {
 734         return platform_driver_probe(&imxfb_driver, imxfb_probe);
 735 }
 736
 737 static void __exit imxfb_cleanup(void)
 738 {
 739         platform_driver_unregister(&imxfb_driver);
 740 }
 741
 742 module_init(imxfb_init);
 743 module_exit(imxfb_cleanup);
 744
 745 MODULE_DESCRIPTION("Motorola i.MX framebuffer driver");
 746 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 747 MODULE_LICENSE("GPL");