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 #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 /* Used fb-mode. Can be set on kernel command line, therefore file-static. */
 134 static const char *fb_mode;
 135
 136
 137 /*
 138  * These are the bitfields for each
 139  * display depth that we support.
 140  */
 141 struct imxfb_rgb {
 142         struct fb_bitfield      red;
 143         struct fb_bitfield      green;
 144         struct fb_bitfield      blue;
 145         struct fb_bitfield      transp;
 146 };
 147
 148 struct imxfb_info {
 149         struct platform_device  *pdev;
 150         void __iomem            *regs;
 151         struct clk              *clk;
 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         struct imx_fb_videomode *mode;
 177         int                     num_modes;
 178
 179         void (*lcd_power)(int);
 180         void (*backlight_power)(int);
 181 };
 182
 183 #define IMX_NAME        "IMX"
 184
 185 /*
 186  * Minimum X and Y resolutions
 187  */
 188 #define MIN_XRES        64
 189 #define MIN_YRES        64
 190
 191 /* Actually this really is 18bit support, the lowest 2 bits of each colour
 192  * are unused in hardware. We claim to have 24bit support to make software
 193  * like X work, which does not support 18bit.
 194  */
 195 static struct imxfb_rgb def_rgb_18 = {
 196         .red    = {.offset = 16, .length = 8,},
 197         .green  = {.offset = 8, .length = 8,},
 198         .blue   = {.offset = 0, .length = 8,},
 199         .transp = {.offset = 0, .length = 0,},
 200 };
 201
 202 static struct imxfb_rgb def_rgb_16_tft = {
 203         .red    = {.offset = 11, .length = 5,},
 204         .green  = {.offset = 5, .length = 6,},
 205         .blue   = {.offset = 0, .length = 5,},
 206         .transp = {.offset = 0, .length = 0,},
 207 };
 208
 209 static struct imxfb_rgb def_rgb_16_stn = {
 210         .red    = {.offset = 8, .length = 4,},
 211         .green  = {.offset = 4, .length = 4,},
 212         .blue   = {.offset = 0, .length = 4,},
 213         .transp = {.offset = 0, .length = 0,},
 214 };
 215
 216 static struct imxfb_rgb def_rgb_8 = {
 217         .red    = {.offset = 0, .length = 8,},
 218         .green  = {.offset = 0, .length = 8,},
 219         .blue   = {.offset = 0, .length = 8,},
 220         .transp = {.offset = 0, .length = 0,},
 221 };
 222
 223 static int imxfb_activate_var(struct fb_var_screeninfo *var,
 224                 struct fb_info *info);
 225
 226 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 227 {
 228         chan &= 0xffff;
 229         chan >>= 16 - bf->length;
 230         return chan << bf->offset;
 231 }
 232
 233 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
 234                 u_int trans, struct fb_info *info)
 235 {
 236         struct imxfb_info *fbi = info->par;
 237         u_int val, ret = 1;
 238
 239 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
 240         if (regno < fbi->palette_size) {
 241                 val = (CNVT_TOHW(red, 4) << 8) |
 242                       (CNVT_TOHW(green,4) << 4) |
 243                       CNVT_TOHW(blue,  4);
 244
 245                 writel(val, fbi->regs + 0x800 + (regno << 2));
 246                 ret = 0;
 247         }
 248         return ret;
 249 }
 250
 251 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 252                    u_int trans, struct fb_info *info)
 253 {
 254         struct imxfb_info *fbi = info->par;
 255         unsigned int val;
 256         int ret = 1;
 257
 258         /*
 259          * If inverse mode was selected, invert all the colours
 260          * rather than the register number.  The register number
 261          * is what you poke into the framebuffer to produce the
 262          * colour you requested.
 263          */
 264         if (fbi->cmap_inverse) {
 265                 red   = 0xffff - red;
 266                 green = 0xffff - green;
 267                 blue  = 0xffff - blue;
 268         }
 269
 270         /*
 271          * If greyscale is true, then we convert the RGB value
 272          * to greyscale no mater what visual we are using.
 273          */
 274         if (info->var.grayscale)
 275                 red = green = blue = (19595 * red + 38470 * green +
 276                                         7471 * blue) >> 16;
 277
 278         switch (info->fix.visual) {
 279         case FB_VISUAL_TRUECOLOR:
 280                 /*
 281                  * 12 or 16-bit True Colour.  We encode the RGB value
 282                  * according to the RGB bitfield information.
 283                  */
 284                 if (regno < 16) {
 285                         u32 *pal = info->pseudo_palette;
 286
 287                         val  = chan_to_field(red, &info->var.red);
 288                         val |= chan_to_field(green, &info->var.green);
 289                         val |= chan_to_field(blue, &info->var.blue);
 290
 291                         pal[regno] = val;
 292                         ret = 0;
 293                 }
 294                 break;
 295
 296         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 297         case FB_VISUAL_PSEUDOCOLOR:
 298                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
 299                 break;
 300         }
 301
 302         return ret;
 303 }
 304
 305 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
 306 {
 307         struct imx_fb_videomode *m;
 308         int i;
 309
 310         for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
 311                 if (!strcmp(m->mode.name, fb_mode))
 312                         return m;
 313         }
 314         return NULL;
 315 }
 316
 317 /*
 318  *  imxfb_check_var():
 319  *    Round up in the following order: bits_per_pixel, xres,
 320  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 321  *    bitfields, horizontal timing, vertical timing.
 322  */
 323 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 324 {
 325         struct imxfb_info *fbi = info->par;
 326         struct imxfb_rgb *rgb;
 327         const struct imx_fb_videomode *imxfb_mode;
 328         unsigned long lcd_clk;
 329         unsigned long long tmp;
 330         u32 pcr = 0;
 331
 332         if (var->xres < MIN_XRES)
 333                 var->xres = MIN_XRES;
 334         if (var->yres < MIN_YRES)
 335                 var->yres = MIN_YRES;
 336
 337         imxfb_mode = imxfb_find_mode(fbi);
 338         if (!imxfb_mode)
 339                 return -EINVAL;
 340
 341         var->xres               = imxfb_mode->mode.xres;
 342         var->yres               = imxfb_mode->mode.yres;
 343         var->bits_per_pixel     = imxfb_mode->bpp;
 344         var->pixclock           = imxfb_mode->mode.pixclock;
 345         var->hsync_len          = imxfb_mode->mode.hsync_len;
 346         var->left_margin        = imxfb_mode->mode.left_margin;
 347         var->right_margin       = imxfb_mode->mode.right_margin;
 348         var->vsync_len          = imxfb_mode->mode.vsync_len;
 349         var->upper_margin       = imxfb_mode->mode.upper_margin;
 350         var->lower_margin       = imxfb_mode->mode.lower_margin;
 351         var->sync               = imxfb_mode->mode.sync;
 352         var->xres_virtual       = max(var->xres_virtual, var->xres);
 353         var->yres_virtual       = max(var->yres_virtual, var->yres);
 354
 355         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
 356
 357         lcd_clk = clk_get_rate(fbi->clk);
 358
 359         tmp = var->pixclock * (unsigned long long)lcd_clk;
 360
 361         do_div(tmp, 1000000);
 362
 363         if (do_div(tmp, 1000000) > 500000)
 364                 tmp++;
 365
 366         pcr = (unsigned int)tmp;
 367
 368         if (--pcr > 0x3F) {
 369                 pcr = 0x3F;
 370                 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
 371                                 lcd_clk / pcr);
 372         }
 373
 374         switch (var->bits_per_pixel) {
 375         case 32:
 376                 pcr |= PCR_BPIX_18;
 377                 rgb = &def_rgb_18;
 378                 break;
 379         case 16:
 380         default:
 381                 if (cpu_is_mx1())
 382                         pcr |= PCR_BPIX_12;
 383                 else
 384                         pcr |= PCR_BPIX_16;
 385
 386                 if (imxfb_mode->pcr & PCR_TFT)
 387                         rgb = &def_rgb_16_tft;
 388                 else
 389                         rgb = &def_rgb_16_stn;
 390                 break;
 391         case 8:
 392                 pcr |= PCR_BPIX_8;
 393                 rgb = &def_rgb_8;
 394                 break;
 395         }
 396
 397         /* add sync polarities */
 398         pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
 399
 400         fbi->pcr = pcr;
 401
 402         /*
 403          * Copy the RGB parameters for this display
 404          * from the machine specific parameters.
 405          */
 406         var->red    = rgb->red;
 407         var->green  = rgb->green;
 408         var->blue   = rgb->blue;
 409         var->transp = rgb->transp;
 410
 411         pr_debug("RGBT length = %d:%d:%d:%d\n",
 412                 var->red.length, var->green.length, var->blue.length,
 413                 var->transp.length);
 414
 415         pr_debug("RGBT offset = %d:%d:%d:%d\n",
 416                 var->red.offset, var->green.offset, var->blue.offset,
 417                 var->transp.offset);
 418
 419         return 0;
 420 }
 421
 422 /*
 423  * imxfb_set_par():
 424  *      Set the user defined part of the display for the specified console
 425  */
 426 static int imxfb_set_par(struct fb_info *info)
 427 {
 428         struct imxfb_info *fbi = info->par;
 429         struct fb_var_screeninfo *var = &info->var;
 430
 431         if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
 432                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 433         else if (!fbi->cmap_static)
 434                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 435         else {
 436                 /*
 437                  * Some people have weird ideas about wanting static
 438                  * pseudocolor maps.  I suspect their user space
 439                  * applications are broken.
 440                  */
 441                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 442         }
 443
 444         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
 445         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 446
 447         imxfb_activate_var(var, info);
 448
 449         return 0;
 450 }
 451
 452 static void imxfb_enable_controller(struct imxfb_info *fbi)
 453 {
 454         pr_debug("Enabling LCD controller\n");
 455
 456         writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
 457
 458         /* panning offset 0 (0 pixel offset)        */
 459         writel(0x00000000, fbi->regs + LCDC_POS);
 460
 461         /* disable hardware cursor */
 462         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
 463                 fbi->regs + LCDC_CPOS);
 464
 465         writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR);
 466
 467         clk_enable(fbi->clk);
 468
 469         if (fbi->backlight_power)
 470                 fbi->backlight_power(1);
 471         if (fbi->lcd_power)
 472                 fbi->lcd_power(1);
 473 }
 474
 475 static void imxfb_disable_controller(struct imxfb_info *fbi)
 476 {
 477         pr_debug("Disabling LCD controller\n");
 478
 479         if (fbi->backlight_power)
 480                 fbi->backlight_power(0);
 481         if (fbi->lcd_power)
 482                 fbi->lcd_power(0);
 483
 484         clk_disable(fbi->clk);
 485
 486         writel(0, fbi->regs + LCDC_RMCR);
 487 }
 488
 489 static int imxfb_blank(int blank, struct fb_info *info)
 490 {
 491         struct imxfb_info *fbi = info->par;
 492
 493         pr_debug("imxfb_blank: blank=%d\n", blank);
 494
 495         switch (blank) {
 496         case FB_BLANK_POWERDOWN:
 497         case FB_BLANK_VSYNC_SUSPEND:
 498         case FB_BLANK_HSYNC_SUSPEND:
 499         case FB_BLANK_NORMAL:
 500                 imxfb_disable_controller(fbi);
 501                 break;
 502
 503         case FB_BLANK_UNBLANK:
 504                 imxfb_enable_controller(fbi);
 505                 break;
 506         }
 507         return 0;
 508 }
 509
 510 static struct fb_ops imxfb_ops = {
 511         .owner          = THIS_MODULE,
 512         .fb_check_var   = imxfb_check_var,
 513         .fb_set_par     = imxfb_set_par,
 514         .fb_setcolreg   = imxfb_setcolreg,
 515         .fb_fillrect    = cfb_fillrect,
 516         .fb_copyarea    = cfb_copyarea,
 517         .fb_imageblit   = cfb_imageblit,
 518         .fb_blank       = imxfb_blank,
 519 };
 520
 521 /*
 522  * imxfb_activate_var():
 523  *      Configures LCD Controller based on entries in var parameter.  Settings are
 524  *      only written to the controller if changes were made.
 525  */
 526 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
 527 {
 528         struct imxfb_info *fbi = info->par;
 529
 530         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 531                 var->xres, var->hsync_len,
 532                 var->left_margin, var->right_margin);
 533         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 534                 var->yres, var->vsync_len,
 535                 var->upper_margin, var->lower_margin);
 536
 537 #if DEBUG_VAR
 538         if (var->xres < 16        || var->xres > 1024)
 539                 printk(KERN_ERR "%s: invalid xres %d\n",
 540                         info->fix.id, var->xres);
 541         if (var->hsync_len < 1    || var->hsync_len > 64)
 542                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 543                         info->fix.id, var->hsync_len);
 544         if (var->left_margin > 255)
 545                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 546                         info->fix.id, var->left_margin);
 547         if (var->right_margin > 255)
 548                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 549                         info->fix.id, var->right_margin);
 550         if (var->yres < 1 || var->yres > 511)
 551                 printk(KERN_ERR "%s: invalid yres %d\n",
 552                         info->fix.id, var->yres);
 553         if (var->vsync_len > 100)
 554                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 555                         info->fix.id, var->vsync_len);
 556         if (var->upper_margin > 63)
 557                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 558                         info->fix.id, var->upper_margin);
 559         if (var->lower_margin > 255)
 560                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 561                         info->fix.id, var->lower_margin);
 562 #endif
 563
 564         /* physical screen start address            */
 565         writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
 566                 fbi->regs + LCDC_VPW);
 567
 568         writel(HCR_H_WIDTH(var->hsync_len - 1) |
 569                 HCR_H_WAIT_1(var->right_margin - 1) |
 570                 HCR_H_WAIT_2(var->left_margin - 3),
 571                 fbi->regs + LCDC_HCR);
 572
 573         writel(VCR_V_WIDTH(var->vsync_len) |
 574                 VCR_V_WAIT_1(var->lower_margin) |
 575                 VCR_V_WAIT_2(var->upper_margin),
 576                 fbi->regs + LCDC_VCR);
 577
 578         writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
 579                         fbi->regs + LCDC_SIZE);
 580
 581         writel(fbi->pcr, fbi->regs + LCDC_PCR);
 582         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 583         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
 584         writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
 585
 586         return 0;
 587 }
 588
 589 #ifdef CONFIG_PM
 590 /*
 591  * Power management hooks.  Note that we won't be called from IRQ context,
 592  * unlike the blank functions above, so we may sleep.
 593  */
 594 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
 595 {
 596         struct imxfb_info *fbi = platform_get_drvdata(dev);
 597
 598         pr_debug("%s\n", __func__);
 599
 600         imxfb_disable_controller(fbi);
 601         return 0;
 602 }
 603
 604 static int imxfb_resume(struct platform_device *dev)
 605 {
 606         struct imxfb_info *fbi = platform_get_drvdata(dev);
 607
 608         pr_debug("%s\n", __func__);
 609
 610         imxfb_enable_controller(fbi);
 611         return 0;
 612 }
 613 #else
 614 #define imxfb_suspend   NULL
 615 #define imxfb_resume    NULL
 616 #endif
 617
 618 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
 619 {
 620         struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
 621         struct fb_info *info = dev_get_drvdata(&pdev->dev);
 622         struct imxfb_info *fbi = info->par;
 623         struct imx_fb_videomode *m;
 624         int i;
 625
 626         pr_debug("%s\n",__func__);
 627
 628         info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
 629         if (!info->pseudo_palette)
 630                 return -ENOMEM;
 631
 632         memset(fbi, 0, sizeof(struct imxfb_info));
 633
 634         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 635
 636         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
 637         info->fix.type_aux              = 0;
 638         info->fix.xpanstep              = 0;
 639         info->fix.ypanstep              = 0;
 640         info->fix.ywrapstep             = 0;
 641         info->fix.accel                 = FB_ACCEL_NONE;
 642
 643         info->var.nonstd                = 0;
 644         info->var.activate              = FB_ACTIVATE_NOW;
 645         info->var.height                = -1;
 646         info->var.width = -1;
 647         info->var.accel_flags           = 0;
 648         info->var.vmode                 = FB_VMODE_NONINTERLACED;
 649
 650         info->fbops                     = &imxfb_ops;
 651         info->flags                     = FBINFO_FLAG_DEFAULT |
 652                                           FBINFO_READS_FAST;
 653         info->var.grayscale             = pdata->cmap_greyscale;
 654         fbi->cmap_inverse               = pdata->cmap_inverse;
 655         fbi->cmap_static                = pdata->cmap_static;
 656         fbi->lscr1                      = pdata->lscr1;
 657         fbi->dmacr                      = pdata->dmacr;
 658         fbi->pwmr                       = pdata->pwmr;
 659         fbi->lcd_power                  = pdata->lcd_power;
 660         fbi->backlight_power            = pdata->backlight_power;
 661
 662         for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
 663                 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
 664                                 m->mode.xres * m->mode.yres * m->bpp / 8);
 665
 666         return 0;
 667 }
 668
 669 static int __init imxfb_probe(struct platform_device *pdev)
 670 {
 671         struct imxfb_info *fbi;
 672         struct fb_info *info;
 673         struct imx_fb_platform_data *pdata;
 674         struct resource *res;
 675         int ret, i;
 676
 677         dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
 678
 679         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 680         if (!res)
 681                 return -ENODEV;
 682
 683         pdata = pdev->dev.platform_data;
 684         if (!pdata) {
 685                 dev_err(&pdev->dev,"No platform_data available\n");
 686                 return -ENOMEM;
 687         }
 688
 689         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
 690         if (!info)
 691                 return -ENOMEM;
 692
 693         fbi = info->par;
 694
 695         if (!fb_mode)
 696                 fb_mode = pdata->mode[0].mode.name;
 697
 698         platform_set_drvdata(pdev, info);
 699
 700         ret = imxfb_init_fbinfo(pdev);
 701         if (ret < 0)
 702                 goto failed_init;
 703
 704         res = request_mem_region(res->start, resource_size(res),
 705                                 DRIVER_NAME);
 706         if (!res) {
 707                 ret = -EBUSY;
 708                 goto failed_req;
 709         }
 710
 711         fbi->clk = clk_get(&pdev->dev, NULL);
 712         if (IS_ERR(fbi->clk)) {
 713                 ret = PTR_ERR(fbi->clk);;
 714                 dev_err(&pdev->dev, "unable to get clock: %d\n", ret);
 715                 goto failed_getclock;
 716         }
 717
 718         fbi->regs = ioremap(res->start, resource_size(res));
 719         if (fbi->regs == NULL) {
 720                 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
 721                 goto failed_ioremap;
 722         }
 723
 724         if (!pdata->fixed_screen_cpu) {
 725                 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
 726                 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
 727                                 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
 728
 729                 if (!fbi->map_cpu) {
 730                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
 731                         ret = -ENOMEM;
 732                         goto failed_map;
 733                 }
 734
 735                 info->screen_base = fbi->map_cpu;
 736                 fbi->screen_cpu = fbi->map_cpu;
 737                 fbi->screen_dma = fbi->map_dma;
 738                 info->fix.smem_start = fbi->screen_dma;
 739         } else {
 740                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
 741                 fbi->map_cpu = pdata->fixed_screen_cpu;
 742                 fbi->map_dma = pdata->fixed_screen_dma;
 743                 info->screen_base = fbi->map_cpu;
 744                 fbi->screen_cpu = fbi->map_cpu;
 745                 fbi->screen_dma = fbi->map_dma;
 746                 info->fix.smem_start = fbi->screen_dma;
 747         }
 748
 749         if (pdata->init) {
 750                 ret = pdata->init(fbi->pdev);
 751                 if (ret)
 752                         goto failed_platform_init;
 753         }
 754
 755         fbi->mode = pdata->mode;
 756         fbi->num_modes = pdata->num_modes;
 757
 758         INIT_LIST_HEAD(&info->modelist);
 759         for (i = 0; i < pdata->num_modes; i++)
 760                 fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
 761
 762         /*
 763          * This makes sure that our colour bitfield
 764          * descriptors are correctly initialised.
 765          */
 766         imxfb_check_var(&info->var, info);
 767
 768         ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
 769         if (ret < 0)
 770                 goto failed_cmap;
 771
 772         imxfb_set_par(info);
 773         ret = register_framebuffer(info);
 774         if (ret < 0) {
 775                 dev_err(&pdev->dev, "failed to register framebuffer\n");
 776                 goto failed_register;
 777         }
 778
 779         imxfb_enable_controller(fbi);
 780
 781         return 0;
 782
 783 failed_register:
 784         fb_dealloc_cmap(&info->cmap);
 785 failed_cmap:
 786         if (pdata->exit)
 787                 pdata->exit(fbi->pdev);
 788 failed_platform_init:
 789         if (!pdata->fixed_screen_cpu)
 790                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
 791                         fbi->map_dma);
 792 failed_map:
 793         clk_put(fbi->clk);
 794 failed_getclock:
 795         iounmap(fbi->regs);
 796 failed_ioremap:
 797         release_mem_region(res->start, resource_size(res));
 798 failed_req:
 799         kfree(info->pseudo_palette);
 800 failed_init:
 801         platform_set_drvdata(pdev, NULL);
 802         framebuffer_release(info);
 803         return ret;
 804 }
 805
 806 static int __devexit imxfb_remove(struct platform_device *pdev)
 807 {
 808         struct imx_fb_platform_data *pdata;
 809         struct fb_info *info = platform_get_drvdata(pdev);
 810         struct imxfb_info *fbi = info->par;
 811         struct resource *res;
 812
 813         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 814
 815         imxfb_disable_controller(fbi);
 816
 817         unregister_framebuffer(info);
 818
 819         pdata = pdev->dev.platform_data;
 820         if (pdata->exit)
 821                 pdata->exit(fbi->pdev);
 822
 823         fb_dealloc_cmap(&info->cmap);
 824         kfree(info->pseudo_palette);
 825         framebuffer_release(info);
 826
 827         iounmap(fbi->regs);
 828         release_mem_region(res->start, resource_size(res));
 829         clk_disable(fbi->clk);
 830         clk_put(fbi->clk);
 831
 832         platform_set_drvdata(pdev, NULL);
 833
 834         return 0;
 835 }
 836
 837 void  imxfb_shutdown(struct platform_device * dev)
 838 {
 839         struct fb_info *info = platform_get_drvdata(dev);
 840         struct imxfb_info *fbi = info->par;
 841         imxfb_disable_controller(fbi);
 842 }
 843
 844 static struct platform_driver imxfb_driver = {
 845         .suspend        = imxfb_suspend,
 846         .resume         = imxfb_resume,
 847         .remove         = __devexit_p(imxfb_remove),
 848         .shutdown       = imxfb_shutdown,
 849         .driver         = {
 850                 .name   = DRIVER_NAME,
 851         },
 852 };
 853
 854 static int imxfb_setup(void)
 855 {
 856 #ifndef MODULE
 857         char *opt, *options = NULL;
 858
 859         if (fb_get_options("imxfb", &options))
 860                 return -ENODEV;
 861
 862         if (!options || !*options)
 863                 return 0;
 864
 865         while ((opt = strsep(&options, ",")) != NULL) {
 866                 if (!*opt)
 867                         continue;
 868                 else
 869                         fb_mode = opt;
 870         }
 871 #endif
 872         return 0;
 873 }
 874
 875 int __init imxfb_init(void)
 876 {
 877         int ret = imxfb_setup();
 878
 879         if (ret < 0)
 880                 return ret;
 881
 882         return platform_driver_probe(&imxfb_driver, imxfb_probe);
 883 }
 884
 885 static void __exit imxfb_cleanup(void)
 886 {
 887         platform_driver_unregister(&imxfb_driver);
 888 }
 889
 890 module_init(imxfb_init);
 891 module_exit(imxfb_cleanup);
 892
 893 MODULE_DESCRIPTION("Motorola i.MX framebuffer driver");
 894 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 895 MODULE_LICENSE("GPL");