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   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 #include <mach/hardware.h>
  37
  38 /*
  39  * Complain if VAR is out of range.
  40  */
  41 #define DEBUG_VAR 1
  42
  43 #define DRIVER_NAME "imx-fb"
  44
  45 #define LCDC_SSA        0x00
  46
  47 #define LCDC_SIZE       0x04
  48 #define SIZE_XMAX(x)    ((((x) >> 4) & 0x3f) << 20)
  49
  50 #ifdef CONFIG_ARCH_MX1
  51 #define SIZE_YMAX(y)    ((y) & 0x1ff)
  52 #else
  53 #define SIZE_YMAX(y)    ((y) & 0x3ff)
  54 #endif
  55
  56 #define LCDC_VPW        0x08
  57 #define VPW_VPW(x)      ((x) & 0x3ff)
  58
  59 #define LCDC_CPOS       0x0C
  60 #define CPOS_CC1        (1<<31)
  61 #define CPOS_CC0        (1<<30)
  62 #define CPOS_OP         (1<<28)
  63 #define CPOS_CXP(x)     (((x) & 3ff) << 16)
  64
  65 #ifdef CONFIG_ARCH_MX1
  66 #define CPOS_CYP(y)     ((y) & 0x1ff)
  67 #else
  68 #define CPOS_CYP(y)     ((y) & 0x3ff)
  69 #endif
  70
  71 #define LCDC_LCWHB      0x10
  72 #define LCWHB_BK_EN     (1<<31)
  73 #define LCWHB_CW(w)     (((w) & 0x1f) << 24)
  74 #define LCWHB_CH(h)     (((h) & 0x1f) << 16)
  75 #define LCWHB_BD(x)     ((x) & 0xff)
  76
  77 #define LCDC_LCHCC      0x14
  78
  79 #ifdef CONFIG_ARCH_MX1
  80 #define LCHCC_CUR_COL_R(r) (((r) & 0x1f) << 11)
  81 #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 5)
  82 #define LCHCC_CUR_COL_B(b) ((b) & 0x1f)
  83 #else
  84 #define LCHCC_CUR_COL_R(r) (((r) & 0x3f) << 12)
  85 #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 6)
  86 #define LCHCC_CUR_COL_B(b) ((b) & 0x3f)
  87 #endif
  88
  89 #define LCDC_PCR        0x18
  90
  91 #define LCDC_HCR        0x1C
  92 #define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
  93 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
  94 #define HCR_H_WAIT_2(x) ((x) & 0xff)
  95
  96 #define LCDC_VCR        0x20
  97 #define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
  98 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
  99 #define VCR_V_WAIT_2(x) ((x) & 0xff)
 100
 101 #define LCDC_POS        0x24
 102 #define POS_POS(x)      ((x) & 1f)
 103
 104 #define LCDC_LSCR1      0x28
 105 /* bit fields in imxfb.h */
 106
 107 #define LCDC_PWMR       0x2C
 108 /* bit fields in imxfb.h */
 109
 110 #define LCDC_DMACR      0x30
 111 /* bit fields in imxfb.h */
 112
 113 #define LCDC_RMCR       0x34
 114
 115 #ifdef CONFIG_ARCH_MX1
 116 #define RMCR_LCDC_EN    (1<<1)
 117 #else
 118 #define RMCR_LCDC_EN    0
 119 #endif
 120
 121 #define RMCR_SELF_REF   (1<<0)
 122
 123 #define LCDC_LCDICR     0x38
 124 #define LCDICR_INT_SYN  (1<<2)
 125 #define LCDICR_INT_CON  (1)
 126
 127 #define LCDC_LCDISR     0x40
 128 #define LCDISR_UDR_ERR  (1<<3)
 129 #define LCDISR_ERR_RES  (1<<2)
 130 #define LCDISR_EOF      (1<<1)
 131 #define LCDISR_BOF      (1<<0)
 132
 133 /*
 134  * These are the bitfields for each
 135  * display depth that we support.
 136  */
 137 struct imxfb_rgb {
 138         struct fb_bitfield      red;
 139         struct fb_bitfield      green;
 140         struct fb_bitfield      blue;
 141         struct fb_bitfield      transp;
 142 };
 143
 144 struct imxfb_info {
 145         struct platform_device  *pdev;
 146         void __iomem            *regs;
 147         struct clk              *clk;
 148
 149         u_int                   max_bpp;
 150         u_int                   max_xres;
 151         u_int                   max_yres;
 152
 153         /*
 154          * These are the addresses we mapped
 155          * the framebuffer memory region to.
 156          */
 157         dma_addr_t              map_dma;
 158         u_char                  *map_cpu;
 159         u_int                   map_size;
 160
 161         u_char                  *screen_cpu;
 162         dma_addr_t              screen_dma;
 163         u_int                   palette_size;
 164
 165         dma_addr_t              dbar1;
 166         dma_addr_t              dbar2;
 167
 168         u_int                   pcr;
 169         u_int                   pwmr;
 170         u_int                   lscr1;
 171         u_int                   dmacr;
 172         u_int                   cmap_inverse:1,
 173                                 cmap_static:1,
 174                                 unused:30;
 175
 176         void (*lcd_power)(int);
 177         void (*backlight_power)(int);
 178 };
 179
 180 #define IMX_NAME        "IMX"
 181
 182 /*
 183  * Minimum X and Y resolutions
 184  */
 185 #define MIN_XRES        64
 186 #define MIN_YRES        64
 187
 188 /* Actually this really is 18bit support, the lowest 2 bits of each colour
 189  * are unused in hardware. We claim to have 24bit support to make software
 190  * like X work, which does not support 18bit.
 191  */
 192 static struct imxfb_rgb def_rgb_18 = {
 193         .red    = {.offset = 16, .length = 8,},
 194         .green  = {.offset = 8, .length = 8,},
 195         .blue   = {.offset = 0, .length = 8,},
 196         .transp = {.offset = 0, .length = 0,},
 197 };
 198
 199 static struct imxfb_rgb def_rgb_16_tft = {
 200         .red    = {.offset = 11, .length = 5,},
 201         .green  = {.offset = 5, .length = 6,},
 202         .blue   = {.offset = 0, .length = 5,},
 203         .transp = {.offset = 0, .length = 0,},
 204 };
 205
 206 static struct imxfb_rgb def_rgb_16_stn = {
 207         .red    = {.offset = 8, .length = 4,},
 208         .green  = {.offset = 4, .length = 4,},
 209         .blue   = {.offset = 0, .length = 4,},
 210         .transp = {.offset = 0, .length = 0,},
 211 };
 212
 213 static struct imxfb_rgb def_rgb_8 = {
 214         .red    = {.offset = 0, .length = 8,},
 215         .green  = {.offset = 0, .length = 8,},
 216         .blue   = {.offset = 0, .length = 8,},
 217         .transp = {.offset = 0, .length = 0,},
 218 };
 219
 220 static int imxfb_activate_var(struct fb_var_screeninfo *var,
 221                 struct fb_info *info);
 222
 223 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 224 {
 225         chan &= 0xffff;
 226         chan >>= 16 - bf->length;
 227         return chan << bf->offset;
 228 }
 229
 230 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
 231                 u_int trans, struct fb_info *info)
 232 {
 233         struct imxfb_info *fbi = info->par;
 234         u_int val, ret = 1;
 235
 236 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
 237         if (regno < fbi->palette_size) {
 238                 val = (CNVT_TOHW(red, 4) << 8) |
 239                       (CNVT_TOHW(green,4) << 4) |
 240                       CNVT_TOHW(blue,  4);
 241
 242                 writel(val, fbi->regs + 0x800 + (regno << 2));
 243                 ret = 0;
 244         }
 245         return ret;
 246 }
 247
 248 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 249                    u_int trans, struct fb_info *info)
 250 {
 251         struct imxfb_info *fbi = info->par;
 252         unsigned int val;
 253         int ret = 1;
 254
 255         /*
 256          * If inverse mode was selected, invert all the colours
 257          * rather than the register number.  The register number
 258          * is what you poke into the framebuffer to produce the
 259          * colour you requested.
 260          */
 261         if (fbi->cmap_inverse) {
 262                 red   = 0xffff - red;
 263                 green = 0xffff - green;
 264                 blue  = 0xffff - blue;
 265         }
 266
 267         /*
 268          * If greyscale is true, then we convert the RGB value
 269          * to greyscale no mater what visual we are using.
 270          */
 271         if (info->var.grayscale)
 272                 red = green = blue = (19595 * red + 38470 * green +
 273                                         7471 * blue) >> 16;
 274
 275         switch (info->fix.visual) {
 276         case FB_VISUAL_TRUECOLOR:
 277                 /*
 278                  * 12 or 16-bit True Colour.  We encode the RGB value
 279                  * according to the RGB bitfield information.
 280                  */
 281                 if (regno < 16) {
 282                         u32 *pal = info->pseudo_palette;
 283
 284                         val  = chan_to_field(red, &info->var.red);
 285                         val |= chan_to_field(green, &info->var.green);
 286                         val |= chan_to_field(blue, &info->var.blue);
 287
 288                         pal[regno] = val;
 289                         ret = 0;
 290                 }
 291                 break;
 292
 293         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 294         case FB_VISUAL_PSEUDOCOLOR:
 295                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
 296                 break;
 297         }
 298
 299         return ret;
 300 }
 301
 302 /*
 303  *  imxfb_check_var():
 304  *    Round up in the following order: bits_per_pixel, xres,
 305  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 306  *    bitfields, horizontal timing, vertical timing.
 307  */
 308 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 309 {
 310         struct imxfb_info *fbi = info->par;
 311         struct imxfb_rgb *rgb;
 312
 313         if (var->xres < MIN_XRES)
 314                 var->xres = MIN_XRES;
 315         if (var->yres < MIN_YRES)
 316                 var->yres = MIN_YRES;
 317         if (var->xres > fbi->max_xres)
 318                 var->xres = fbi->max_xres;
 319         if (var->yres > fbi->max_yres)
 320                 var->yres = fbi->max_yres;
 321         var->xres_virtual = max(var->xres_virtual, var->xres);
 322         var->yres_virtual = max(var->yres_virtual, var->yres);
 323
 324         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
 325         switch (var->bits_per_pixel) {
 326         case 32:
 327                 rgb = &def_rgb_18;
 328                 break;
 329         case 16:
 330         default:
 331                 if (fbi->pcr & PCR_TFT)
 332                         rgb = &def_rgb_16_tft;
 333                 else
 334                         rgb = &def_rgb_16_stn;
 335                 break;
 336         case 8:
 337                 rgb = &def_rgb_8;
 338                 break;
 339         }
 340
 341         /*
 342          * Copy the RGB parameters for this display
 343          * from the machine specific parameters.
 344          */
 345         var->red    = rgb->red;
 346         var->green  = rgb->green;
 347         var->blue   = rgb->blue;
 348         var->transp = rgb->transp;
 349
 350         pr_debug("RGBT length = %d:%d:%d:%d\n",
 351                 var->red.length, var->green.length, var->blue.length,
 352                 var->transp.length);
 353
 354         pr_debug("RGBT offset = %d:%d:%d:%d\n",
 355                 var->red.offset, var->green.offset, var->blue.offset,
 356                 var->transp.offset);
 357
 358         return 0;
 359 }
 360
 361 /*
 362  * imxfb_set_par():
 363  *      Set the user defined part of the display for the specified console
 364  */
 365 static int imxfb_set_par(struct fb_info *info)
 366 {
 367         struct imxfb_info *fbi = info->par;
 368         struct fb_var_screeninfo *var = &info->var;
 369
 370         if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
 371                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 372         else if (!fbi->cmap_static)
 373                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 374         else {
 375                 /*
 376                  * Some people have weird ideas about wanting static
 377                  * pseudocolor maps.  I suspect their user space
 378                  * applications are broken.
 379                  */
 380                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 381         }
 382
 383         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
 384         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 385
 386         imxfb_activate_var(var, info);
 387
 388         return 0;
 389 }
 390
 391 static void imxfb_enable_controller(struct imxfb_info *fbi)
 392 {
 393         pr_debug("Enabling LCD controller\n");
 394
 395         writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
 396
 397         /* physical screen start address            */
 398         writel(VPW_VPW(fbi->max_xres * fbi->max_bpp / 8 / 4),
 399                 fbi->regs + LCDC_VPW);
 400
 401         /* panning offset 0 (0 pixel offset)        */
 402         writel(0x00000000, fbi->regs + LCDC_POS);
 403
 404         /* disable hardware cursor */
 405         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
 406                 fbi->regs + LCDC_CPOS);
 407
 408         writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR);
 409
 410         clk_enable(fbi->clk);
 411
 412         if (fbi->backlight_power)
 413                 fbi->backlight_power(1);
 414         if (fbi->lcd_power)
 415                 fbi->lcd_power(1);
 416 }
 417
 418 static void imxfb_disable_controller(struct imxfb_info *fbi)
 419 {
 420         pr_debug("Disabling LCD controller\n");
 421
 422         if (fbi->backlight_power)
 423                 fbi->backlight_power(0);
 424         if (fbi->lcd_power)
 425                 fbi->lcd_power(0);
 426
 427         clk_disable(fbi->clk);
 428
 429         writel(0, fbi->regs + LCDC_RMCR);
 430 }
 431
 432 static int imxfb_blank(int blank, struct fb_info *info)
 433 {
 434         struct imxfb_info *fbi = info->par;
 435
 436         pr_debug("imxfb_blank: blank=%d\n", blank);
 437
 438         switch (blank) {
 439         case FB_BLANK_POWERDOWN:
 440         case FB_BLANK_VSYNC_SUSPEND:
 441         case FB_BLANK_HSYNC_SUSPEND:
 442         case FB_BLANK_NORMAL:
 443                 imxfb_disable_controller(fbi);
 444                 break;
 445
 446         case FB_BLANK_UNBLANK:
 447                 imxfb_enable_controller(fbi);
 448                 break;
 449         }
 450         return 0;
 451 }
 452
 453 static struct fb_ops imxfb_ops = {
 454         .owner          = THIS_MODULE,
 455         .fb_check_var   = imxfb_check_var,
 456         .fb_set_par     = imxfb_set_par,
 457         .fb_setcolreg   = imxfb_setcolreg,
 458         .fb_fillrect    = cfb_fillrect,
 459         .fb_copyarea    = cfb_copyarea,
 460         .fb_imageblit   = cfb_imageblit,
 461         .fb_blank       = imxfb_blank,
 462 };
 463
 464 /*
 465  * imxfb_activate_var():
 466  *      Configures LCD Controller based on entries in var parameter.  Settings are
 467  *      only written to the controller if changes were made.
 468  */
 469 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
 470 {
 471         struct imxfb_info *fbi = info->par;
 472         unsigned int pcr, lcd_clk;
 473         unsigned long long tmp;
 474
 475         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 476                 var->xres, var->hsync_len,
 477                 var->left_margin, var->right_margin);
 478         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 479                 var->yres, var->vsync_len,
 480                 var->upper_margin, var->lower_margin);
 481
 482 #if DEBUG_VAR
 483         if (var->xres < 16        || var->xres > 1024)
 484                 printk(KERN_ERR "%s: invalid xres %d\n",
 485                         info->fix.id, var->xres);
 486         if (var->hsync_len < 1    || var->hsync_len > 64)
 487                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 488                         info->fix.id, var->hsync_len);
 489         if (var->left_margin > 255)
 490                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 491                         info->fix.id, var->left_margin);
 492         if (var->right_margin > 255)
 493                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 494                         info->fix.id, var->right_margin);
 495         if (var->yres < 1 || var->yres > 511)
 496                 printk(KERN_ERR "%s: invalid yres %d\n",
 497                         info->fix.id, var->yres);
 498         if (var->vsync_len > 100)
 499                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 500                         info->fix.id, var->vsync_len);
 501         if (var->upper_margin > 63)
 502                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 503                         info->fix.id, var->upper_margin);
 504         if (var->lower_margin > 255)
 505                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 506                         info->fix.id, var->lower_margin);
 507 #endif
 508
 509         writel(HCR_H_WIDTH(var->hsync_len - 1) |
 510                 HCR_H_WAIT_1(var->right_margin - 1) |
 511                 HCR_H_WAIT_2(var->left_margin - 3),
 512                 fbi->regs + LCDC_HCR);
 513
 514         writel(VCR_V_WIDTH(var->vsync_len) |
 515                 VCR_V_WAIT_1(var->lower_margin) |
 516                 VCR_V_WAIT_2(var->upper_margin),
 517                 fbi->regs + LCDC_VCR);
 518
 519         writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
 520                         fbi->regs + LCDC_SIZE);
 521
 522         lcd_clk = clk_get_rate(fbi->clk);
 523         tmp = var->pixclock * (unsigned long long)lcd_clk;
 524         do_div(tmp, 1000000);
 525         if (do_div(tmp, 1000000) > 500000)
 526                 tmp++;
 527         pcr = (unsigned int)tmp;
 528         if (--pcr > 0x3F) {
 529                 pcr = 0x3F;
 530                 printk(KERN_WARNING "Must limit pixel clock to %uHz\n",
 531                                 lcd_clk / pcr);
 532         }
 533
 534         switch (var->bits_per_pixel) {
 535         case 32:
 536                 pcr |= PCR_BPIX_18;
 537                 break;
 538         case 16:
 539         default:
 540                 if (cpu_is_mx1())
 541                         pcr |= PCR_BPIX_12;
 542                 else
 543                         pcr |= PCR_BPIX_16;
 544                 break;
 545         case 8:
 546                 pcr |= PCR_BPIX_8;
 547                 break;
 548         }
 549
 550         /* add sync polarities */
 551         pcr |= fbi->pcr & ~(0x3f | (7 << 25));
 552
 553         writel(pcr, fbi->regs + LCDC_PCR);
 554         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 555         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
 556         writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
 557
 558         return 0;
 559 }
 560
 561 #ifdef CONFIG_PM
 562 /*
 563  * Power management hooks.  Note that we won't be called from IRQ context,
 564  * unlike the blank functions above, so we may sleep.
 565  */
 566 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
 567 {
 568         struct imxfb_info *fbi = platform_get_drvdata(dev);
 569
 570         pr_debug("%s\n", __func__);
 571
 572         imxfb_disable_controller(fbi);
 573         return 0;
 574 }
 575
 576 static int imxfb_resume(struct platform_device *dev)
 577 {
 578         struct imxfb_info *fbi = platform_get_drvdata(dev);
 579
 580         pr_debug("%s\n", __func__);
 581
 582         imxfb_enable_controller(fbi);
 583         return 0;
 584 }
 585 #else
 586 #define imxfb_suspend   NULL
 587 #define imxfb_resume    NULL
 588 #endif
 589
 590 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
 591 {
 592         struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
 593         struct fb_info *info = dev_get_drvdata(&pdev->dev);
 594         struct imxfb_info *fbi = info->par;
 595
 596         pr_debug("%s\n",__func__);
 597
 598         info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
 599         if (!info->pseudo_palette)
 600                 return -ENOMEM;
 601
 602         memset(fbi, 0, sizeof(struct imxfb_info));
 603
 604         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 605
 606         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
 607         info->fix.type_aux              = 0;
 608         info->fix.xpanstep              = 0;
 609         info->fix.ypanstep              = 0;
 610         info->fix.ywrapstep             = 0;
 611         info->fix.accel                 = FB_ACCEL_NONE;
 612
 613         info->var.nonstd                = 0;
 614         info->var.activate              = FB_ACTIVATE_NOW;
 615         info->var.height                = -1;
 616         info->var.width = -1;
 617         info->var.accel_flags           = 0;
 618         info->var.vmode                 = FB_VMODE_NONINTERLACED;
 619
 620         info->fbops                     = &imxfb_ops;
 621         info->flags                     = FBINFO_FLAG_DEFAULT |
 622                                           FBINFO_READS_FAST;
 623
 624         fbi->max_xres                   = pdata->xres;
 625         info->var.xres                  = pdata->xres;
 626         info->var.xres_virtual          = pdata->xres;
 627         fbi->max_yres                   = pdata->yres;
 628         info->var.yres                  = pdata->yres;
 629         info->var.yres_virtual          = pdata->yres;
 630         fbi->max_bpp                    = pdata->bpp;
 631         info->var.bits_per_pixel        = pdata->bpp;
 632         info->var.nonstd                = pdata->nonstd;
 633         info->var.pixclock              = pdata->pixclock;
 634         info->var.hsync_len             = pdata->hsync_len;
 635         info->var.left_margin           = pdata->left_margin;
 636         info->var.right_margin          = pdata->right_margin;
 637         info->var.vsync_len             = pdata->vsync_len;
 638         info->var.upper_margin          = pdata->upper_margin;
 639         info->var.lower_margin          = pdata->lower_margin;
 640         info->var.sync                  = pdata->sync;
 641         info->var.grayscale             = pdata->cmap_greyscale;
 642         fbi->cmap_inverse               = pdata->cmap_inverse;
 643         fbi->cmap_static                = pdata->cmap_static;
 644         fbi->pcr                        = pdata->pcr;
 645         fbi->lscr1                      = pdata->lscr1;
 646         fbi->dmacr                      = pdata->dmacr;
 647         fbi->pwmr                       = pdata->pwmr;
 648         fbi->lcd_power                  = pdata->lcd_power;
 649         fbi->backlight_power            = pdata->backlight_power;
 650         info->fix.smem_len              = fbi->max_xres * fbi->max_yres *
 651                                           fbi->max_bpp / 8;
 652
 653         return 0;
 654 }
 655
 656 static int __init imxfb_probe(struct platform_device *pdev)
 657 {
 658         struct imxfb_info *fbi;
 659         struct fb_info *info;
 660         struct imx_fb_platform_data *pdata;
 661         struct resource *res;
 662         int ret;
 663
 664         printk("i.MX Framebuffer driver\n");
 665
 666         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 667         if (!res)
 668                 return -ENODEV;
 669
 670         pdata = pdev->dev.platform_data;
 671         if (!pdata) {
 672                 dev_err(&pdev->dev,"No platform_data available\n");
 673                 return -ENOMEM;
 674         }
 675
 676         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
 677         if (!info)
 678                 return -ENOMEM;
 679
 680         fbi = info->par;
 681
 682         platform_set_drvdata(pdev, info);
 683
 684         ret = imxfb_init_fbinfo(pdev);
 685         if (ret < 0)
 686                 goto failed_init;
 687
 688         res = request_mem_region(res->start, resource_size(res),
 689                                 DRIVER_NAME);
 690         if (!res) {
 691                 ret = -EBUSY;
 692                 goto failed_req;
 693         }
 694
 695         fbi->clk = clk_get(&pdev->dev, NULL);
 696         if (IS_ERR(fbi->clk)) {
 697                 ret = PTR_ERR(fbi->clk);;
 698                 dev_err(&pdev->dev, "unable to get clock: %d\n", ret);
 699                 goto failed_getclock;
 700         }
 701
 702         fbi->regs = ioremap(res->start, resource_size(res));
 703         if (fbi->regs == NULL) {
 704                 printk(KERN_ERR"Cannot map frame buffer registers\n");
 705                 goto failed_ioremap;
 706         }
 707
 708         if (!pdata->fixed_screen_cpu) {
 709                 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
 710                 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
 711                                 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
 712
 713                 if (!fbi->map_cpu) {
 714                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
 715                         ret = -ENOMEM;
 716                         goto failed_map;
 717                 }
 718
 719                 info->screen_base = fbi->map_cpu;
 720                 fbi->screen_cpu = fbi->map_cpu;
 721                 fbi->screen_dma = fbi->map_dma;
 722                 info->fix.smem_start = fbi->screen_dma;
 723         } else {
 724                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
 725                 fbi->map_cpu = pdata->fixed_screen_cpu;
 726                 fbi->map_dma = pdata->fixed_screen_dma;
 727                 info->screen_base = fbi->map_cpu;
 728                 fbi->screen_cpu = fbi->map_cpu;
 729                 fbi->screen_dma = fbi->map_dma;
 730                 info->fix.smem_start = fbi->screen_dma;
 731         }
 732
 733         if (pdata->init) {
 734                 ret = pdata->init(fbi->pdev);
 735                 if (ret)
 736                         goto failed_platform_init;
 737         }
 738
 739         /*
 740          * This makes sure that our colour bitfield
 741          * descriptors are correctly initialised.
 742          */
 743         imxfb_check_var(&info->var, info);
 744
 745         ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
 746         if (ret < 0)
 747                 goto failed_cmap;
 748
 749         imxfb_set_par(info);
 750         ret = register_framebuffer(info);
 751         if (ret < 0) {
 752                 dev_err(&pdev->dev, "failed to register framebuffer\n");
 753                 goto failed_register;
 754         }
 755
 756         imxfb_enable_controller(fbi);
 757
 758         return 0;
 759
 760 failed_register:
 761         fb_dealloc_cmap(&info->cmap);
 762 failed_cmap:
 763         if (pdata->exit)
 764                 pdata->exit(fbi->pdev);
 765 failed_platform_init:
 766         if (!pdata->fixed_screen_cpu)
 767                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
 768                         fbi->map_dma);
 769 failed_map:
 770         clk_put(fbi->clk);
 771 failed_getclock:
 772         iounmap(fbi->regs);
 773 failed_ioremap:
 774         release_mem_region(res->start, res->end - res->start);
 775 failed_req:
 776         kfree(info->pseudo_palette);
 777 failed_init:
 778         platform_set_drvdata(pdev, NULL);
 779         framebuffer_release(info);
 780         return ret;
 781 }
 782
 783 static int __devexit imxfb_remove(struct platform_device *pdev)
 784 {
 785         struct imx_fb_platform_data *pdata;
 786         struct fb_info *info = platform_get_drvdata(pdev);
 787         struct imxfb_info *fbi = info->par;
 788         struct resource *res;
 789
 790         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 791
 792         imxfb_disable_controller(fbi);
 793
 794         unregister_framebuffer(info);
 795
 796         pdata = pdev->dev.platform_data;
 797         if (pdata->exit)
 798                 pdata->exit(fbi->pdev);
 799
 800         fb_dealloc_cmap(&info->cmap);
 801         kfree(info->pseudo_palette);
 802         framebuffer_release(info);
 803
 804         iounmap(fbi->regs);
 805         release_mem_region(res->start, res->end - res->start + 1);
 806         clk_disable(fbi->clk);
 807         clk_put(fbi->clk);
 808
 809         platform_set_drvdata(pdev, NULL);
 810
 811         return 0;
 812 }
 813
 814 void  imxfb_shutdown(struct platform_device * dev)
 815 {
 816         struct fb_info *info = platform_get_drvdata(dev);
 817         struct imxfb_info *fbi = info->par;
 818         imxfb_disable_controller(fbi);
 819 }
 820
 821 static struct platform_driver imxfb_driver = {
 822         .suspend        = imxfb_suspend,
 823         .resume         = imxfb_resume,
 824         .remove         = __devexit_p(imxfb_remove),
 825         .shutdown       = imxfb_shutdown,
 826         .driver         = {
 827                 .name   = DRIVER_NAME,
 828         },
 829 };
 830
 831 int __init imxfb_init(void)
 832 {
 833         return platform_driver_probe(&imxfb_driver, imxfb_probe);
 834 }
 835
 836 static void __exit imxfb_cleanup(void)
 837 {
 838         platform_driver_unregister(&imxfb_driver);
 839 }
 840
 841 module_init(imxfb_init);
 842 module_exit(imxfb_cleanup);
 843
 844 MODULE_DESCRIPTION("Motorola i.MX framebuffer driver");
 845 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 846 MODULE_LICENSE("GPL");