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 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/errno.h>
  20 #include <linux/string.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/fb.h>
  25 #include <linux/delay.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/cpufreq.h>
  29 #include <linux/clk.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/dma-mapping.h>
  32 #include <linux/io.h>
  33 #include <linux/math64.h>
  34
  35 #include <mach/imxfb.h>
  36
  37 /*
  38  * Complain if VAR is out of range.
  39  */
  40 #define DEBUG_VAR 1
  41
  42 #define DRIVER_NAME "imx-fb"
  43
  44 #define LCDC_SSA        0x00
  45
  46 #define LCDC_SIZE       0x04
  47 #define SIZE_XMAX(x)    ((((x) >> 4) & 0x3f) << 20)
  48
  49 #ifdef CONFIG_ARCH_MX1
  50 #define SIZE_YMAX(y)    ((y) & 0x1ff)
  51 #else
  52 #define SIZE_YMAX(y)    ((y) & 0x3ff)
  53 #endif
  54
  55 #define LCDC_VPW        0x08
  56 #define VPW_VPW(x)      ((x) & 0x3ff)
  57
  58 #define LCDC_CPOS       0x0C
  59 #define CPOS_CC1        (1<<31)
  60 #define CPOS_CC0        (1<<30)
  61 #define CPOS_OP         (1<<28)
  62 #define CPOS_CXP(x)     (((x) & 3ff) << 16)
  63
  64 #ifdef CONFIG_ARCH_MX1
  65 #define CPOS_CYP(y)     ((y) & 0x1ff)
  66 #else
  67 #define CPOS_CYP(y)     ((y) & 0x3ff)
  68 #endif
  69
  70 #define LCDC_LCWHB      0x10
  71 #define LCWHB_BK_EN     (1<<31)
  72 #define LCWHB_CW(w)     (((w) & 0x1f) << 24)
  73 #define LCWHB_CH(h)     (((h) & 0x1f) << 16)
  74 #define LCWHB_BD(x)     ((x) & 0xff)
  75
  76 #define LCDC_LCHCC      0x14
  77
  78 #ifdef CONFIG_ARCH_MX1
  79 #define LCHCC_CUR_COL_R(r) (((r) & 0x1f) << 11)
  80 #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 5)
  81 #define LCHCC_CUR_COL_B(b) ((b) & 0x1f)
  82 #else
  83 #define LCHCC_CUR_COL_R(r) (((r) & 0x3f) << 12)
  84 #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 6)
  85 #define LCHCC_CUR_COL_B(b) ((b) & 0x3f)
  86 #endif
  87
  88 #define LCDC_PCR        0x18
  89
  90 #define LCDC_HCR        0x1C
  91 #define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
  92 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
  93 #define HCR_H_WAIT_2(x) ((x) & 0xff)
  94
  95 #define LCDC_VCR        0x20
  96 #define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
  97 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
  98 #define VCR_V_WAIT_2(x) ((x) & 0xff)
  99
 100 #define LCDC_POS        0x24
 101 #define POS_POS(x)      ((x) & 1f)
 102
 103 #define LCDC_LSCR1      0x28
 104 /* bit fields in imxfb.h */
 105
 106 #define LCDC_PWMR       0x2C
 107 /* bit fields in imxfb.h */
 108
 109 #define LCDC_DMACR      0x30
 110 /* bit fields in imxfb.h */
 111
 112 #define LCDC_RMCR       0x34
 113
 114 #ifdef CONFIG_ARCH_MX1
 115 #define RMCR_LCDC_EN    (1<<1)
 116 #else
 117 #define RMCR_LCDC_EN    0
 118 #endif
 119
 120 #define RMCR_SELF_REF   (1<<0)
 121
 122 #define LCDC_LCDICR     0x38
 123 #define LCDICR_INT_SYN  (1<<2)
 124 #define LCDICR_INT_CON  (1)
 125
 126 #define LCDC_LCDISR     0x40
 127 #define LCDISR_UDR_ERR  (1<<3)
 128 #define LCDISR_ERR_RES  (1<<2)
 129 #define LCDISR_EOF      (1<<1)
 130 #define LCDISR_BOF      (1<<0)
 131
 132 /*
 133  * These are the bitfields for each
 134  * display depth that we support.
 135  */
 136 struct imxfb_rgb {
 137         struct fb_bitfield      red;
 138         struct fb_bitfield      green;
 139         struct fb_bitfield      blue;
 140         struct fb_bitfield      transp;
 141 };
 142
 143 struct imxfb_info {
 144         struct platform_device  *pdev;
 145         void __iomem            *regs;
 146         struct clk              *clk;
 147
 148         u_int                   max_bpp;
 149         u_int                   max_xres;
 150         u_int                   max_yres;
 151
 152         /*
 153          * These are the addresses we mapped
 154          * the framebuffer memory region to.
 155          */
 156         dma_addr_t              map_dma;
 157         u_char                  *map_cpu;
 158         u_int                   map_size;
 159
 160         u_char                  *screen_cpu;
 161         dma_addr_t              screen_dma;
 162         u_int                   palette_size;
 163
 164         dma_addr_t              dbar1;
 165         dma_addr_t              dbar2;
 166
 167         u_int                   pcr;
 168         u_int                   pwmr;
 169         u_int                   lscr1;
 170         u_int                   dmacr;
 171         u_int                   cmap_inverse:1,
 172                                 cmap_static:1,
 173                                 unused:30;
 174
 175         void (*lcd_power)(int);
 176         void (*backlight_power)(int);
 177 };
 178
 179 #define IMX_NAME        "IMX"
 180
 181 /*
 182  * Minimum X and Y resolutions
 183  */
 184 #define MIN_XRES        64
 185 #define MIN_YRES        64
 186
 187 /* Actually this really is 18bit support, the lowest 2 bits of each colour
 188  * are unused in hardware. We claim to have 24bit support to make software
 189  * like X work, which does not support 18bit.
 190  */
 191 static struct imxfb_rgb def_rgb_18 = {
 192         .red    = {.offset = 16, .length = 8,},
 193         .green  = {.offset = 8, .length = 8,},
 194         .blue   = {.offset = 0, .length = 8,},
 195         .transp = {.offset = 0, .length = 0,},
 196 };
 197
 198 static struct imxfb_rgb def_rgb_16_tft = {
 199         .red    = {.offset = 11, .length = 5,},
 200         .green  = {.offset = 5, .length = 6,},
 201         .blue   = {.offset = 0, .length = 5,},
 202         .transp = {.offset = 0, .length = 0,},
 203 };
 204
 205 static struct imxfb_rgb def_rgb_16_stn = {
 206         .red    = {.offset = 8, .length = 4,},
 207         .green  = {.offset = 4, .length = 4,},
 208         .blue   = {.offset = 0, .length = 4,},
 209         .transp = {.offset = 0, .length = 0,},
 210 };
 211
 212 static struct imxfb_rgb def_rgb_8 = {
 213         .red    = {.offset = 0, .length = 8,},
 214         .green  = {.offset = 0, .length = 8,},
 215         .blue   = {.offset = 0, .length = 8,},
 216         .transp = {.offset = 0, .length = 0,},
 217 };
 218
 219 static int imxfb_activate_var(struct fb_var_screeninfo *var,
 220                 struct fb_info *info);
 221
 222 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 223 {
 224         chan &= 0xffff;
 225         chan >>= 16 - bf->length;
 226         return chan << bf->offset;
 227 }
 228
 229 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
 230                 u_int trans, struct fb_info *info)
 231 {
 232         struct imxfb_info *fbi = info->par;
 233         u_int val, ret = 1;
 234
 235 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
 236         if (regno < fbi->palette_size) {
 237                 val = (CNVT_TOHW(red, 4) << 8) |
 238                       (CNVT_TOHW(green,4) << 4) |
 239                       CNVT_TOHW(blue,  4);
 240
 241                 writel(val, fbi->regs + 0x800 + (regno << 2));
 242                 ret = 0;
 243         }
 244         return ret;
 245 }
 246
 247 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 248                    u_int trans, struct fb_info *info)
 249 {
 250         struct imxfb_info *fbi = info->par;
 251         unsigned int val;
 252         int ret = 1;
 253
 254         /*
 255          * If inverse mode was selected, invert all the colours
 256          * rather than the register number.  The register number
 257          * is what you poke into the framebuffer to produce the
 258          * colour you requested.
 259          */
 260         if (fbi->cmap_inverse) {
 261                 red   = 0xffff - red;
 262                 green = 0xffff - green;
 263                 blue  = 0xffff - blue;
 264         }
 265
 266         /*
 267          * If greyscale is true, then we convert the RGB value
 268          * to greyscale no mater what visual we are using.
 269          */
 270         if (info->var.grayscale)
 271                 red = green = blue = (19595 * red + 38470 * green +
 272                                         7471 * blue) >> 16;
 273
 274         switch (info->fix.visual) {
 275         case FB_VISUAL_TRUECOLOR:
 276                 /*
 277                  * 12 or 16-bit True Colour.  We encode the RGB value
 278                  * according to the RGB bitfield information.
 279                  */
 280                 if (regno < 16) {
 281                         u32 *pal = info->pseudo_palette;
 282
 283                         val  = chan_to_field(red, &info->var.red);
 284                         val |= chan_to_field(green, &info->var.green);
 285                         val |= chan_to_field(blue, &info->var.blue);
 286
 287                         pal[regno] = val;
 288                         ret = 0;
 289                 }
 290                 break;
 291
 292         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 293         case FB_VISUAL_PSEUDOCOLOR:
 294                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
 295                 break;
 296         }
 297
 298         return ret;
 299 }
 300
 301 /*
 302  *  imxfb_check_var():
 303  *    Round up in the following order: bits_per_pixel, xres,
 304  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 305  *    bitfields, horizontal timing, vertical timing.
 306  */
 307 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 308 {
 309         struct imxfb_info *fbi = info->par;
 310         struct imxfb_rgb *rgb;
 311
 312         if (var->xres < MIN_XRES)
 313                 var->xres = MIN_XRES;
 314         if (var->yres < MIN_YRES)
 315                 var->yres = MIN_YRES;
 316         if (var->xres > fbi->max_xres)
 317                 var->xres = fbi->max_xres;
 318         if (var->yres > fbi->max_yres)
 319                 var->yres = fbi->max_yres;
 320         var->xres_virtual = max(var->xres_virtual, var->xres);
 321         var->yres_virtual = max(var->yres_virtual, var->yres);
 322
 323         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
 324         switch (var->bits_per_pixel) {
 325         case 32:
 326                 rgb = &def_rgb_18;
 327                 break;
 328         case 16:
 329         default:
 330                 if (fbi->pcr & PCR_TFT)
 331                         rgb = &def_rgb_16_tft;
 332                 else
 333                         rgb = &def_rgb_16_stn;
 334                 break;
 335         case 8:
 336                 rgb = &def_rgb_8;
 337                 break;
 338         }
 339
 340         /*
 341          * Copy the RGB parameters for this display
 342          * from the machine specific parameters.
 343          */
 344         var->red    = rgb->red;
 345         var->green  = rgb->green;
 346         var->blue   = rgb->blue;
 347         var->transp = rgb->transp;
 348
 349         pr_debug("RGBT length = %d:%d:%d:%d\n",
 350                 var->red.length, var->green.length, var->blue.length,
 351                 var->transp.length);
 352
 353         pr_debug("RGBT offset = %d:%d:%d:%d\n",
 354                 var->red.offset, var->green.offset, var->blue.offset,
 355                 var->transp.offset);
 356
 357         return 0;
 358 }
 359
 360 /*
 361  * imxfb_set_par():
 362  *      Set the user defined part of the display for the specified console
 363  */
 364 static int imxfb_set_par(struct fb_info *info)
 365 {
 366         struct imxfb_info *fbi = info->par;
 367         struct fb_var_screeninfo *var = &info->var;
 368
 369         if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
 370                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 371         else if (!fbi->cmap_static)
 372                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 373         else {
 374                 /*
 375                  * Some people have weird ideas about wanting static
 376                  * pseudocolor maps.  I suspect their user space
 377                  * applications are broken.
 378                  */
 379                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 380         }
 381
 382         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
 383         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 384
 385         imxfb_activate_var(var, info);
 386
 387         return 0;
 388 }
 389
 390 static void imxfb_enable_controller(struct imxfb_info *fbi)
 391 {
 392         pr_debug("Enabling LCD controller\n");
 393
 394         writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
 395
 396         /* physical screen start address            */
 397         writel(VPW_VPW(fbi->max_xres * fbi->max_bpp / 8 / 4),
 398                 fbi->regs + LCDC_VPW);
 399
 400         /* panning offset 0 (0 pixel offset)        */
 401         writel(0x00000000, fbi->regs + LCDC_POS);
 402
 403         /* disable hardware cursor */
 404         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
 405                 fbi->regs + LCDC_CPOS);
 406
 407         writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR);
 408
 409         clk_enable(fbi->clk);
 410
 411         if (fbi->backlight_power)
 412                 fbi->backlight_power(1);
 413         if (fbi->lcd_power)
 414                 fbi->lcd_power(1);
 415 }
 416
 417 static void imxfb_disable_controller(struct imxfb_info *fbi)
 418 {
 419         pr_debug("Disabling LCD controller\n");
 420
 421         if (fbi->backlight_power)
 422                 fbi->backlight_power(0);
 423         if (fbi->lcd_power)
 424                 fbi->lcd_power(0);
 425
 426         clk_disable(fbi->clk);
 427
 428         writel(0, fbi->regs + LCDC_RMCR);
 429 }
 430
 431 static int imxfb_blank(int blank, struct fb_info *info)
 432 {
 433         struct imxfb_info *fbi = info->par;
 434
 435         pr_debug("imxfb_blank: blank=%d\n", blank);
 436
 437         switch (blank) {
 438         case FB_BLANK_POWERDOWN:
 439         case FB_BLANK_VSYNC_SUSPEND:
 440         case FB_BLANK_HSYNC_SUSPEND:
 441         case FB_BLANK_NORMAL:
 442                 imxfb_disable_controller(fbi);
 443                 break;
 444
 445         case FB_BLANK_UNBLANK:
 446                 imxfb_enable_controller(fbi);
 447                 break;
 448         }
 449         return 0;
 450 }
 451
 452 static struct fb_ops imxfb_ops = {
 453         .owner          = THIS_MODULE,
 454         .fb_check_var   = imxfb_check_var,
 455         .fb_set_par     = imxfb_set_par,
 456         .fb_setcolreg   = imxfb_setcolreg,
 457         .fb_fillrect    = cfb_fillrect,
 458         .fb_copyarea    = cfb_copyarea,
 459         .fb_imageblit   = cfb_imageblit,
 460         .fb_blank       = imxfb_blank,
 461 };
 462
 463 /*
 464  * imxfb_activate_var():
 465  *      Configures LCD Controller based on entries in var parameter.  Settings are
 466  *      only written to the controller if changes were made.
 467  */
 468 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
 469 {
 470         struct imxfb_info *fbi = info->par;
 471         unsigned int pcr, lcd_clk;
 472         unsigned long long tmp;
 473
 474         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 475                 var->xres, var->hsync_len,
 476                 var->left_margin, var->right_margin);
 477         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 478                 var->yres, var->vsync_len,
 479                 var->upper_margin, var->lower_margin);
 480
 481 #if DEBUG_VAR
 482         if (var->xres < 16        || var->xres > 1024)
 483                 printk(KERN_ERR "%s: invalid xres %d\n",
 484                         info->fix.id, var->xres);
 485         if (var->hsync_len < 1    || var->hsync_len > 64)
 486                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 487                         info->fix.id, var->hsync_len);
 488         if (var->left_margin > 255)
 489                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 490                         info->fix.id, var->left_margin);
 491         if (var->right_margin > 255)
 492                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 493                         info->fix.id, var->right_margin);
 494         if (var->yres < 1 || var->yres > 511)
 495                 printk(KERN_ERR "%s: invalid yres %d\n",
 496                         info->fix.id, var->yres);
 497         if (var->vsync_len > 100)
 498                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 499                         info->fix.id, var->vsync_len);
 500         if (var->upper_margin > 63)
 501                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 502                         info->fix.id, var->upper_margin);
 503         if (var->lower_margin > 255)
 504                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 505                         info->fix.id, var->lower_margin);
 506 #endif
 507
 508         writel(HCR_H_WIDTH(var->hsync_len - 1) |
 509                 HCR_H_WAIT_1(var->right_margin - 1) |
 510                 HCR_H_WAIT_2(var->left_margin - 3),
 511                 fbi->regs + LCDC_HCR);
 512
 513         writel(VCR_V_WIDTH(var->vsync_len) |
 514                 VCR_V_WAIT_1(var->lower_margin) |
 515                 VCR_V_WAIT_2(var->upper_margin),
 516                 fbi->regs + LCDC_VCR);
 517
 518         writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
 519                         fbi->regs + LCDC_SIZE);
 520
 521         lcd_clk = clk_get_rate(fbi->clk);
 522         tmp = var->pixclock * (unsigned long long)lcd_clk;
 523         do_div(tmp, 1000000);
 524         if (do_div(tmp, 1000000) > 500000)
 525                 tmp++;
 526         pcr = (unsigned int)tmp;
 527         if (--pcr > 0x3F) {
 528                 pcr = 0x3F;
 529                 printk(KERN_WARNING "Must limit pixel clock to %uHz\n",
 530                                 lcd_clk / pcr);
 531         }
 532
 533         /* add sync polarities */
 534         pcr |= fbi->pcr & ~0x3F;
 535
 536         writel(pcr, fbi->regs + LCDC_PCR);
 537         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 538         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
 539         writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
 540
 541         return 0;
 542 }
 543
 544 #ifdef CONFIG_PM
 545 /*
 546  * Power management hooks.  Note that we won't be called from IRQ context,
 547  * unlike the blank functions above, so we may sleep.
 548  */
 549 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
 550 {
 551         struct imxfb_info *fbi = platform_get_drvdata(dev);
 552
 553         pr_debug("%s\n", __func__);
 554
 555         imxfb_disable_controller(fbi);
 556         return 0;
 557 }
 558
 559 static int imxfb_resume(struct platform_device *dev)
 560 {
 561         struct imxfb_info *fbi = platform_get_drvdata(dev);
 562
 563         pr_debug("%s\n", __func__);
 564
 565         imxfb_enable_controller(fbi);
 566         return 0;
 567 }
 568 #else
 569 #define imxfb_suspend   NULL
 570 #define imxfb_resume    NULL
 571 #endif
 572
 573 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
 574 {
 575         struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
 576         struct fb_info *info = dev_get_drvdata(&pdev->dev);
 577         struct imxfb_info *fbi = info->par;
 578
 579         pr_debug("%s\n",__func__);
 580
 581         info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
 582         if (!info->pseudo_palette)
 583                 return -ENOMEM;
 584
 585         memset(fbi, 0, sizeof(struct imxfb_info));
 586
 587         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 588
 589         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
 590         info->fix.type_aux              = 0;
 591         info->fix.xpanstep              = 0;
 592         info->fix.ypanstep              = 0;
 593         info->fix.ywrapstep             = 0;
 594         info->fix.accel                 = FB_ACCEL_NONE;
 595
 596         info->var.nonstd                = 0;
 597         info->var.activate              = FB_ACTIVATE_NOW;
 598         info->var.height                = -1;
 599         info->var.width = -1;
 600         info->var.accel_flags           = 0;
 601         info->var.vmode                 = FB_VMODE_NONINTERLACED;
 602
 603         info->fbops                     = &imxfb_ops;
 604         info->flags                     = FBINFO_FLAG_DEFAULT |
 605                                           FBINFO_READS_FAST;
 606
 607         fbi->max_xres                   = pdata->xres;
 608         info->var.xres                  = pdata->xres;
 609         info->var.xres_virtual          = pdata->xres;
 610         fbi->max_yres                   = pdata->yres;
 611         info->var.yres                  = pdata->yres;
 612         info->var.yres_virtual          = pdata->yres;
 613         fbi->max_bpp                    = pdata->bpp;
 614         info->var.bits_per_pixel        = pdata->bpp;
 615         info->var.nonstd                = pdata->nonstd;
 616         info->var.pixclock              = pdata->pixclock;
 617         info->var.hsync_len             = pdata->hsync_len;
 618         info->var.left_margin           = pdata->left_margin;
 619         info->var.right_margin          = pdata->right_margin;
 620         info->var.vsync_len             = pdata->vsync_len;
 621         info->var.upper_margin          = pdata->upper_margin;
 622         info->var.lower_margin          = pdata->lower_margin;
 623         info->var.sync                  = pdata->sync;
 624         info->var.grayscale             = pdata->cmap_greyscale;
 625         fbi->cmap_inverse               = pdata->cmap_inverse;
 626         fbi->cmap_static                = pdata->cmap_static;
 627         fbi->pcr                        = pdata->pcr;
 628         fbi->lscr1                      = pdata->lscr1;
 629         fbi->dmacr                      = pdata->dmacr;
 630         fbi->pwmr                       = pdata->pwmr;
 631         fbi->lcd_power                  = pdata->lcd_power;
 632         fbi->backlight_power            = pdata->backlight_power;
 633         info->fix.smem_len              = fbi->max_xres * fbi->max_yres *
 634                                           fbi->max_bpp / 8;
 635
 636         return 0;
 637 }
 638
 639 static int __init imxfb_probe(struct platform_device *pdev)
 640 {
 641         struct imxfb_info *fbi;
 642         struct fb_info *info;
 643         struct imx_fb_platform_data *pdata;
 644         struct resource *res;
 645         int ret;
 646
 647         printk("i.MX Framebuffer driver\n");
 648
 649         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 650         if (!res)
 651                 return -ENODEV;
 652
 653         pdata = pdev->dev.platform_data;
 654         if (!pdata) {
 655                 dev_err(&pdev->dev,"No platform_data available\n");
 656                 return -ENOMEM;
 657         }
 658
 659         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
 660         if (!info)
 661                 return -ENOMEM;
 662
 663         fbi = info->par;
 664
 665         platform_set_drvdata(pdev, info);
 666
 667         ret = imxfb_init_fbinfo(pdev);
 668         if (ret < 0)
 669                 goto failed_init;
 670
 671         res = request_mem_region(res->start, resource_size(res),
 672                                 DRIVER_NAME);
 673         if (!res) {
 674                 ret = -EBUSY;
 675                 goto failed_req;
 676         }
 677
 678         fbi->clk = clk_get(&pdev->dev, NULL);
 679         if (IS_ERR(fbi->clk)) {
 680                 ret = PTR_ERR(fbi->clk);;
 681                 dev_err(&pdev->dev, "unable to get clock: %d\n", ret);
 682                 goto failed_getclock;
 683         }
 684
 685         fbi->regs = ioremap(res->start, resource_size(res));
 686         if (fbi->regs == NULL) {
 687                 printk(KERN_ERR"Cannot map frame buffer registers\n");
 688                 goto failed_ioremap;
 689         }
 690
 691         if (!pdata->fixed_screen_cpu) {
 692                 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
 693                 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
 694                                 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
 695
 696                 if (!fbi->map_cpu) {
 697                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
 698                         ret = -ENOMEM;
 699                         goto failed_map;
 700                 }
 701
 702                 info->screen_base = fbi->map_cpu;
 703                 fbi->screen_cpu = fbi->map_cpu;
 704                 fbi->screen_dma = fbi->map_dma;
 705                 info->fix.smem_start = fbi->screen_dma;
 706         } else {
 707                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
 708                 fbi->map_cpu = pdata->fixed_screen_cpu;
 709                 fbi->map_dma = pdata->fixed_screen_dma;
 710                 info->screen_base = fbi->map_cpu;
 711                 fbi->screen_cpu = fbi->map_cpu;
 712                 fbi->screen_dma = fbi->map_dma;
 713                 info->fix.smem_start = fbi->screen_dma;
 714         }
 715
 716         if (pdata->init) {
 717                 ret = pdata->init(fbi->pdev);
 718                 if (ret)
 719                         goto failed_platform_init;
 720         }
 721
 722         /*
 723          * This makes sure that our colour bitfield
 724          * descriptors are correctly initialised.
 725          */
 726         imxfb_check_var(&info->var, info);
 727
 728         ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
 729         if (ret < 0)
 730                 goto failed_cmap;
 731
 732         imxfb_set_par(info);
 733         ret = register_framebuffer(info);
 734         if (ret < 0) {
 735                 dev_err(&pdev->dev, "failed to register framebuffer\n");
 736                 goto failed_register;
 737         }
 738
 739         imxfb_enable_controller(fbi);
 740
 741         return 0;
 742
 743 failed_register:
 744         fb_dealloc_cmap(&info->cmap);
 745 failed_cmap:
 746         if (pdata->exit)
 747                 pdata->exit(fbi->pdev);
 748 failed_platform_init:
 749         if (!pdata->fixed_screen_cpu)
 750                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
 751                         fbi->map_dma);
 752 failed_map:
 753         clk_put(fbi->clk);
 754 failed_getclock:
 755         iounmap(fbi->regs);
 756 failed_ioremap:
 757         release_mem_region(res->start, res->end - res->start);
 758 failed_req:
 759         kfree(info->pseudo_palette);
 760 failed_init:
 761         platform_set_drvdata(pdev, NULL);
 762         framebuffer_release(info);
 763         return ret;
 764 }
 765
 766 static int __devexit imxfb_remove(struct platform_device *pdev)
 767 {
 768         struct imx_fb_platform_data *pdata;
 769         struct fb_info *info = platform_get_drvdata(pdev);
 770         struct imxfb_info *fbi = info->par;
 771         struct resource *res;
 772
 773         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 774
 775         imxfb_disable_controller(fbi);
 776
 777         unregister_framebuffer(info);
 778
 779         pdata = pdev->dev.platform_data;
 780         if (pdata->exit)
 781                 pdata->exit(fbi->pdev);
 782
 783         fb_dealloc_cmap(&info->cmap);
 784         kfree(info->pseudo_palette);
 785         framebuffer_release(info);
 786
 787         iounmap(fbi->regs);
 788         release_mem_region(res->start, res->end - res->start + 1);
 789         clk_disable(fbi->clk);
 790         clk_put(fbi->clk);
 791
 792         platform_set_drvdata(pdev, NULL);
 793
 794         return 0;
 795 }
 796
 797 void  imxfb_shutdown(struct platform_device * dev)
 798 {
 799         struct fb_info *info = platform_get_drvdata(dev);
 800         struct imxfb_info *fbi = info->par;
 801         imxfb_disable_controller(fbi);
 802 }
 803
 804 static struct platform_driver imxfb_driver = {
 805         .suspend        = imxfb_suspend,
 806         .resume         = imxfb_resume,
 807         .remove         = __devexit_p(imxfb_remove),
 808         .shutdown       = imxfb_shutdown,
 809         .driver         = {
 810                 .name   = DRIVER_NAME,
 811         },
 812 };
 813
 814 int __init imxfb_init(void)
 815 {
 816         return platform_driver_probe(&imxfb_driver, imxfb_probe);
 817 }
 818
 819 static void __exit imxfb_cleanup(void)
 820 {
 821         platform_driver_unregister(&imxfb_driver);
 822 }
 823
 824 module_init(imxfb_init);
 825 module_exit(imxfb_cleanup);
 826
 827 MODULE_DESCRIPTION("Motorola i.MX framebuffer driver");
 828 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 829 MODULE_LICENSE("GPL");