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 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
  44         (defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE) && \
  45                 defined(CONFIG_FB_IMX_MODULE))
  46 #define PWMR_BACKLIGHT_AVAILABLE
  47 #endif
  48
  49 #define DRIVER_NAME "imx-fb"
  50
  51 #define LCDC_SSA        0x00
  52
  53 #define LCDC_SIZE       0x04
  54 #define SIZE_XMAX(x)    ((((x) >> 4) & 0x3f) << 20)
  55
  56 #define YMAX_MASK       (cpu_is_mx1() ? 0x1ff : 0x3ff)
  57 #define SIZE_YMAX(y)    ((y) & YMAX_MASK)
  58
  59 #define LCDC_VPW        0x08
  60 #define VPW_VPW(x)      ((x) & 0x3ff)
  61
  62 #define LCDC_CPOS       0x0C
  63 #define CPOS_CC1        (1<<31)
  64 #define CPOS_CC0        (1<<30)
  65 #define CPOS_OP         (1<<28)
  66 #define CPOS_CXP(x)     (((x) & 3ff) << 16)
  67
  68 #define LCDC_LCWHB      0x10
  69 #define LCWHB_BK_EN     (1<<31)
  70 #define LCWHB_CW(w)     (((w) & 0x1f) << 24)
  71 #define LCWHB_CH(h)     (((h) & 0x1f) << 16)
  72 #define LCWHB_BD(x)     ((x) & 0xff)
  73
  74 #define LCDC_LCHCC      0x14
  75
  76 #define LCDC_PCR        0x18
  77
  78 #define LCDC_HCR        0x1C
  79 #define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
  80 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
  81 #define HCR_H_WAIT_2(x) ((x) & 0xff)
  82
  83 #define LCDC_VCR        0x20
  84 #define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
  85 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
  86 #define VCR_V_WAIT_2(x) ((x) & 0xff)
  87
  88 #define LCDC_POS        0x24
  89 #define POS_POS(x)      ((x) & 1f)
  90
  91 #define LCDC_LSCR1      0x28
  92 /* bit fields in imxfb.h */
  93
  94 #define LCDC_PWMR       0x2C
  95 /* bit fields in imxfb.h */
  96
  97 #define LCDC_DMACR      0x30
  98 /* bit fields in imxfb.h */
  99
 100 #define LCDC_RMCR       0x34
 101
 102 #define RMCR_LCDC_EN_MX1        (1<<1)
 103
 104 #define RMCR_SELF_REF   (1<<0)
 105
 106 #define LCDC_LCDICR     0x38
 107 #define LCDICR_INT_SYN  (1<<2)
 108 #define LCDICR_INT_CON  (1)
 109
 110 #define LCDC_LCDISR     0x40
 111 #define LCDISR_UDR_ERR  (1<<3)
 112 #define LCDISR_ERR_RES  (1<<2)
 113 #define LCDISR_EOF      (1<<1)
 114 #define LCDISR_BOF      (1<<0)
 115
 116 /* Used fb-mode. Can be set on kernel command line, therefore file-static. */
 117 static const char *fb_mode;
 118
 119
 120 /*
 121  * These are the bitfields for each
 122  * display depth that we support.
 123  */
 124 struct imxfb_rgb {
 125         struct fb_bitfield      red;
 126         struct fb_bitfield      green;
 127         struct fb_bitfield      blue;
 128         struct fb_bitfield      transp;
 129 };
 130
 131 struct imxfb_info {
 132         struct platform_device  *pdev;
 133         void __iomem            *regs;
 134         struct clk              *clk;
 135
 136         /*
 137          * These are the addresses we mapped
 138          * the framebuffer memory region to.
 139          */
 140         dma_addr_t              map_dma;
 141         u_char                  *map_cpu;
 142         u_int                   map_size;
 143
 144         u_char                  *screen_cpu;
 145         dma_addr_t              screen_dma;
 146         u_int                   palette_size;
 147
 148         dma_addr_t              dbar1;
 149         dma_addr_t              dbar2;
 150
 151         u_int                   pcr;
 152         u_int                   pwmr;
 153         u_int                   lscr1;
 154         u_int                   dmacr;
 155         u_int                   cmap_inverse:1,
 156                                 cmap_static:1,
 157                                 unused:30;
 158
 159         struct imx_fb_videomode *mode;
 160         int                     num_modes;
 161 #ifdef PWMR_BACKLIGHT_AVAILABLE
 162         struct backlight_device *bl;
 163 #endif
 164
 165         void (*lcd_power)(int);
 166         void (*backlight_power)(int);
 167 };
 168
 169 #define IMX_NAME        "IMX"
 170
 171 /*
 172  * Minimum X and Y resolutions
 173  */
 174 #define MIN_XRES        64
 175 #define MIN_YRES        64
 176
 177 /* Actually this really is 18bit support, the lowest 2 bits of each colour
 178  * are unused in hardware. We claim to have 24bit support to make software
 179  * like X work, which does not support 18bit.
 180  */
 181 static struct imxfb_rgb def_rgb_18 = {
 182         .red    = {.offset = 16, .length = 8,},
 183         .green  = {.offset = 8, .length = 8,},
 184         .blue   = {.offset = 0, .length = 8,},
 185         .transp = {.offset = 0, .length = 0,},
 186 };
 187
 188 static struct imxfb_rgb def_rgb_16_tft = {
 189         .red    = {.offset = 11, .length = 5,},
 190         .green  = {.offset = 5, .length = 6,},
 191         .blue   = {.offset = 0, .length = 5,},
 192         .transp = {.offset = 0, .length = 0,},
 193 };
 194
 195 static struct imxfb_rgb def_rgb_16_stn = {
 196         .red    = {.offset = 8, .length = 4,},
 197         .green  = {.offset = 4, .length = 4,},
 198         .blue   = {.offset = 0, .length = 4,},
 199         .transp = {.offset = 0, .length = 0,},
 200 };
 201
 202 static struct imxfb_rgb def_rgb_8 = {
 203         .red    = {.offset = 0, .length = 8,},
 204         .green  = {.offset = 0, .length = 8,},
 205         .blue   = {.offset = 0, .length = 8,},
 206         .transp = {.offset = 0, .length = 0,},
 207 };
 208
 209 static int imxfb_activate_var(struct fb_var_screeninfo *var,
 210                 struct fb_info *info);
 211
 212 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 213 {
 214         chan &= 0xffff;
 215         chan >>= 16 - bf->length;
 216         return chan << bf->offset;
 217 }
 218
 219 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
 220                 u_int trans, struct fb_info *info)
 221 {
 222         struct imxfb_info *fbi = info->par;
 223         u_int val, ret = 1;
 224
 225 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
 226         if (regno < fbi->palette_size) {
 227                 val = (CNVT_TOHW(red, 4) << 8) |
 228                       (CNVT_TOHW(green,4) << 4) |
 229                       CNVT_TOHW(blue,  4);
 230
 231                 writel(val, fbi->regs + 0x800 + (regno << 2));
 232                 ret = 0;
 233         }
 234         return ret;
 235 }
 236
 237 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 238                    u_int trans, struct fb_info *info)
 239 {
 240         struct imxfb_info *fbi = info->par;
 241         unsigned int val;
 242         int ret = 1;
 243
 244         /*
 245          * If inverse mode was selected, invert all the colours
 246          * rather than the register number.  The register number
 247          * is what you poke into the framebuffer to produce the
 248          * colour you requested.
 249          */
 250         if (fbi->cmap_inverse) {
 251                 red   = 0xffff - red;
 252                 green = 0xffff - green;
 253                 blue  = 0xffff - blue;
 254         }
 255
 256         /*
 257          * If greyscale is true, then we convert the RGB value
 258          * to greyscale no mater what visual we are using.
 259          */
 260         if (info->var.grayscale)
 261                 red = green = blue = (19595 * red + 38470 * green +
 262                                         7471 * blue) >> 16;
 263
 264         switch (info->fix.visual) {
 265         case FB_VISUAL_TRUECOLOR:
 266                 /*
 267                  * 12 or 16-bit True Colour.  We encode the RGB value
 268                  * according to the RGB bitfield information.
 269                  */
 270                 if (regno < 16) {
 271                         u32 *pal = info->pseudo_palette;
 272
 273                         val  = chan_to_field(red, &info->var.red);
 274                         val |= chan_to_field(green, &info->var.green);
 275                         val |= chan_to_field(blue, &info->var.blue);
 276
 277                         pal[regno] = val;
 278                         ret = 0;
 279                 }
 280                 break;
 281
 282         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 283         case FB_VISUAL_PSEUDOCOLOR:
 284                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
 285                 break;
 286         }
 287
 288         return ret;
 289 }
 290
 291 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
 292 {
 293         struct imx_fb_videomode *m;
 294         int i;
 295
 296         for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
 297                 if (!strcmp(m->mode.name, fb_mode))
 298                         return m;
 299         }
 300         return NULL;
 301 }
 302
 303 /*
 304  *  imxfb_check_var():
 305  *    Round up in the following order: bits_per_pixel, xres,
 306  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 307  *    bitfields, horizontal timing, vertical timing.
 308  */
 309 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 310 {
 311         struct imxfb_info *fbi = info->par;
 312         struct imxfb_rgb *rgb;
 313         const struct imx_fb_videomode *imxfb_mode;
 314         unsigned long lcd_clk;
 315         unsigned long long tmp;
 316         u32 pcr = 0;
 317
 318         if (var->xres < MIN_XRES)
 319                 var->xres = MIN_XRES;
 320         if (var->yres < MIN_YRES)
 321                 var->yres = MIN_YRES;
 322
 323         imxfb_mode = imxfb_find_mode(fbi);
 324         if (!imxfb_mode)
 325                 return -EINVAL;
 326
 327         var->xres               = imxfb_mode->mode.xres;
 328         var->yres               = imxfb_mode->mode.yres;
 329         var->bits_per_pixel     = imxfb_mode->bpp;
 330         var->pixclock           = imxfb_mode->mode.pixclock;
 331         var->hsync_len          = imxfb_mode->mode.hsync_len;
 332         var->left_margin        = imxfb_mode->mode.left_margin;
 333         var->right_margin       = imxfb_mode->mode.right_margin;
 334         var->vsync_len          = imxfb_mode->mode.vsync_len;
 335         var->upper_margin       = imxfb_mode->mode.upper_margin;
 336         var->lower_margin       = imxfb_mode->mode.lower_margin;
 337         var->sync               = imxfb_mode->mode.sync;
 338         var->xres_virtual       = max(var->xres_virtual, var->xres);
 339         var->yres_virtual       = max(var->yres_virtual, var->yres);
 340
 341         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
 342
 343         lcd_clk = clk_get_rate(fbi->clk);
 344
 345         tmp = var->pixclock * (unsigned long long)lcd_clk;
 346
 347         do_div(tmp, 1000000);
 348
 349         if (do_div(tmp, 1000000) > 500000)
 350                 tmp++;
 351
 352         pcr = (unsigned int)tmp;
 353
 354         if (--pcr > 0x3F) {
 355                 pcr = 0x3F;
 356                 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
 357                                 lcd_clk / pcr);
 358         }
 359
 360         switch (var->bits_per_pixel) {
 361         case 32:
 362                 pcr |= PCR_BPIX_18;
 363                 rgb = &def_rgb_18;
 364                 break;
 365         case 16:
 366         default:
 367                 if (cpu_is_mx1())
 368                         pcr |= PCR_BPIX_12;
 369                 else
 370                         pcr |= PCR_BPIX_16;
 371
 372                 if (imxfb_mode->pcr & PCR_TFT)
 373                         rgb = &def_rgb_16_tft;
 374                 else
 375                         rgb = &def_rgb_16_stn;
 376                 break;
 377         case 8:
 378                 pcr |= PCR_BPIX_8;
 379                 rgb = &def_rgb_8;
 380                 break;
 381         }
 382
 383         /* add sync polarities */
 384         pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
 385
 386         fbi->pcr = pcr;
 387
 388         /*
 389          * Copy the RGB parameters for this display
 390          * from the machine specific parameters.
 391          */
 392         var->red    = rgb->red;
 393         var->green  = rgb->green;
 394         var->blue   = rgb->blue;
 395         var->transp = rgb->transp;
 396
 397         pr_debug("RGBT length = %d:%d:%d:%d\n",
 398                 var->red.length, var->green.length, var->blue.length,
 399                 var->transp.length);
 400
 401         pr_debug("RGBT offset = %d:%d:%d:%d\n",
 402                 var->red.offset, var->green.offset, var->blue.offset,
 403                 var->transp.offset);
 404
 405         return 0;
 406 }
 407
 408 /*
 409  * imxfb_set_par():
 410  *      Set the user defined part of the display for the specified console
 411  */
 412 static int imxfb_set_par(struct fb_info *info)
 413 {
 414         struct imxfb_info *fbi = info->par;
 415         struct fb_var_screeninfo *var = &info->var;
 416
 417         if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
 418                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 419         else if (!fbi->cmap_static)
 420                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 421         else {
 422                 /*
 423                  * Some people have weird ideas about wanting static
 424                  * pseudocolor maps.  I suspect their user space
 425                  * applications are broken.
 426                  */
 427                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 428         }
 429
 430         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
 431         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 432
 433         imxfb_activate_var(var, info);
 434
 435         return 0;
 436 }
 437
 438 #ifdef PWMR_BACKLIGHT_AVAILABLE
 439 static int imxfb_bl_get_brightness(struct backlight_device *bl)
 440 {
 441         struct imxfb_info *fbi = bl_get_data(bl);
 442
 443         return readl(fbi->regs + LCDC_PWMR) & 0xFF;
 444 }
 445
 446 static int imxfb_bl_update_status(struct backlight_device *bl)
 447 {
 448         struct imxfb_info *fbi = bl_get_data(bl);
 449         int brightness = bl->props.brightness;
 450
 451         if (bl->props.power != FB_BLANK_UNBLANK)
 452                 brightness = 0;
 453         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 454                 brightness = 0;
 455
 456         fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
 457
 458         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 459                 clk_enable(fbi->clk);
 460         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 461         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 462                 clk_disable(fbi->clk);
 463
 464         return 0;
 465 }
 466
 467 static const struct backlight_ops imxfb_lcdc_bl_ops = {
 468         .update_status = imxfb_bl_update_status,
 469         .get_brightness = imxfb_bl_get_brightness,
 470 };
 471
 472 static void imxfb_init_backlight(struct imxfb_info *fbi)
 473 {
 474         struct backlight_properties props;
 475         struct backlight_device *bl;
 476
 477         if (fbi->bl)
 478                 return;
 479
 480         memset(&props, 0, sizeof(struct backlight_properties));
 481         props.max_brightness = 0xff;
 482         props.type = BACKLIGHT_RAW;
 483         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 484
 485         bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
 486                                        &imxfb_lcdc_bl_ops, &props);
 487         if (IS_ERR(bl)) {
 488                 dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
 489                                 PTR_ERR(bl));
 490                 return;
 491         }
 492
 493         fbi->bl = bl;
 494         bl->props.power = FB_BLANK_UNBLANK;
 495         bl->props.fb_blank = FB_BLANK_UNBLANK;
 496         bl->props.brightness = imxfb_bl_get_brightness(bl);
 497 }
 498
 499 static void imxfb_exit_backlight(struct imxfb_info *fbi)
 500 {
 501         if (fbi->bl)
 502                 backlight_device_unregister(fbi->bl);
 503 }
 504 #endif
 505
 506 static void imxfb_enable_controller(struct imxfb_info *fbi)
 507 {
 508         pr_debug("Enabling LCD controller\n");
 509
 510         writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
 511
 512         /* panning offset 0 (0 pixel offset)        */
 513         writel(0x00000000, fbi->regs + LCDC_POS);
 514
 515         /* disable hardware cursor */
 516         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
 517                 fbi->regs + LCDC_CPOS);
 518
 519         /*
 520          * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
 521          * on other SoCs
 522          */
 523         writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
 524
 525         clk_enable(fbi->clk);
 526
 527         if (fbi->backlight_power)
 528                 fbi->backlight_power(1);
 529         if (fbi->lcd_power)
 530                 fbi->lcd_power(1);
 531 }
 532
 533 static void imxfb_disable_controller(struct imxfb_info *fbi)
 534 {
 535         pr_debug("Disabling LCD controller\n");
 536
 537         if (fbi->backlight_power)
 538                 fbi->backlight_power(0);
 539         if (fbi->lcd_power)
 540                 fbi->lcd_power(0);
 541
 542         clk_disable(fbi->clk);
 543
 544         writel(0, fbi->regs + LCDC_RMCR);
 545 }
 546
 547 static int imxfb_blank(int blank, struct fb_info *info)
 548 {
 549         struct imxfb_info *fbi = info->par;
 550
 551         pr_debug("imxfb_blank: blank=%d\n", blank);
 552
 553         switch (blank) {
 554         case FB_BLANK_POWERDOWN:
 555         case FB_BLANK_VSYNC_SUSPEND:
 556         case FB_BLANK_HSYNC_SUSPEND:
 557         case FB_BLANK_NORMAL:
 558                 imxfb_disable_controller(fbi);
 559                 break;
 560
 561         case FB_BLANK_UNBLANK:
 562                 imxfb_enable_controller(fbi);
 563                 break;
 564         }
 565         return 0;
 566 }
 567
 568 static struct fb_ops imxfb_ops = {
 569         .owner          = THIS_MODULE,
 570         .fb_check_var   = imxfb_check_var,
 571         .fb_set_par     = imxfb_set_par,
 572         .fb_setcolreg   = imxfb_setcolreg,
 573         .fb_fillrect    = cfb_fillrect,
 574         .fb_copyarea    = cfb_copyarea,
 575         .fb_imageblit   = cfb_imageblit,
 576         .fb_blank       = imxfb_blank,
 577 };
 578
 579 /*
 580  * imxfb_activate_var():
 581  *      Configures LCD Controller based on entries in var parameter.  Settings are
 582  *      only written to the controller if changes were made.
 583  */
 584 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
 585 {
 586         struct imxfb_info *fbi = info->par;
 587
 588         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 589                 var->xres, var->hsync_len,
 590                 var->left_margin, var->right_margin);
 591         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 592                 var->yres, var->vsync_len,
 593                 var->upper_margin, var->lower_margin);
 594
 595 #if DEBUG_VAR
 596         if (var->xres < 16        || var->xres > 1024)
 597                 printk(KERN_ERR "%s: invalid xres %d\n",
 598                         info->fix.id, var->xres);
 599         if (var->hsync_len < 1    || var->hsync_len > 64)
 600                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 601                         info->fix.id, var->hsync_len);
 602         if (var->left_margin > 255)
 603                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 604                         info->fix.id, var->left_margin);
 605         if (var->right_margin > 255)
 606                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 607                         info->fix.id, var->right_margin);
 608         if (var->yres < 1 || var->yres > YMAX_MASK)
 609                 printk(KERN_ERR "%s: invalid yres %d\n",
 610                         info->fix.id, var->yres);
 611         if (var->vsync_len > 100)
 612                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 613                         info->fix.id, var->vsync_len);
 614         if (var->upper_margin > 63)
 615                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 616                         info->fix.id, var->upper_margin);
 617         if (var->lower_margin > 255)
 618                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 619                         info->fix.id, var->lower_margin);
 620 #endif
 621
 622         /* physical screen start address            */
 623         writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
 624                 fbi->regs + LCDC_VPW);
 625
 626         writel(HCR_H_WIDTH(var->hsync_len - 1) |
 627                 HCR_H_WAIT_1(var->right_margin - 1) |
 628                 HCR_H_WAIT_2(var->left_margin - 3),
 629                 fbi->regs + LCDC_HCR);
 630
 631         writel(VCR_V_WIDTH(var->vsync_len) |
 632                 VCR_V_WAIT_1(var->lower_margin) |
 633                 VCR_V_WAIT_2(var->upper_margin),
 634                 fbi->regs + LCDC_VCR);
 635
 636         writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
 637                         fbi->regs + LCDC_SIZE);
 638
 639         writel(fbi->pcr, fbi->regs + LCDC_PCR);
 640 #ifndef PWMR_BACKLIGHT_AVAILABLE
 641         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 642 #endif
 643         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
 644         writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
 645
 646         return 0;
 647 }
 648
 649 #ifdef CONFIG_PM
 650 /*
 651  * Power management hooks.  Note that we won't be called from IRQ context,
 652  * unlike the blank functions above, so we may sleep.
 653  */
 654 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
 655 {
 656         struct fb_info *info = platform_get_drvdata(dev);
 657         struct imxfb_info *fbi = info->par;
 658
 659         pr_debug("%s\n", __func__);
 660
 661         imxfb_disable_controller(fbi);
 662         return 0;
 663 }
 664
 665 static int imxfb_resume(struct platform_device *dev)
 666 {
 667         struct fb_info *info = platform_get_drvdata(dev);
 668         struct imxfb_info *fbi = info->par;
 669
 670         pr_debug("%s\n", __func__);
 671
 672         imxfb_enable_controller(fbi);
 673         return 0;
 674 }
 675 #else
 676 #define imxfb_suspend   NULL
 677 #define imxfb_resume    NULL
 678 #endif
 679
 680 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
 681 {
 682         struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
 683         struct fb_info *info = dev_get_drvdata(&pdev->dev);
 684         struct imxfb_info *fbi = info->par;
 685         struct imx_fb_videomode *m;
 686         int i;
 687
 688         pr_debug("%s\n",__func__);
 689
 690         info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
 691         if (!info->pseudo_palette)
 692                 return -ENOMEM;
 693
 694         memset(fbi, 0, sizeof(struct imxfb_info));
 695
 696         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 697
 698         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
 699         info->fix.type_aux              = 0;
 700         info->fix.xpanstep              = 0;
 701         info->fix.ypanstep              = 0;
 702         info->fix.ywrapstep             = 0;
 703         info->fix.accel                 = FB_ACCEL_NONE;
 704
 705         info->var.nonstd                = 0;
 706         info->var.activate              = FB_ACTIVATE_NOW;
 707         info->var.height                = -1;
 708         info->var.width = -1;
 709         info->var.accel_flags           = 0;
 710         info->var.vmode                 = FB_VMODE_NONINTERLACED;
 711
 712         info->fbops                     = &imxfb_ops;
 713         info->flags                     = FBINFO_FLAG_DEFAULT |
 714                                           FBINFO_READS_FAST;
 715         info->var.grayscale             = pdata->cmap_greyscale;
 716         fbi->cmap_inverse               = pdata->cmap_inverse;
 717         fbi->cmap_static                = pdata->cmap_static;
 718         fbi->lscr1                      = pdata->lscr1;
 719         fbi->dmacr                      = pdata->dmacr;
 720         fbi->pwmr                       = pdata->pwmr;
 721         fbi->lcd_power                  = pdata->lcd_power;
 722         fbi->backlight_power            = pdata->backlight_power;
 723
 724         for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
 725                 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
 726                                 m->mode.xres * m->mode.yres * m->bpp / 8);
 727
 728         return 0;
 729 }
 730
 731 static int __init imxfb_probe(struct platform_device *pdev)
 732 {
 733         struct imxfb_info *fbi;
 734         struct fb_info *info;
 735         struct imx_fb_platform_data *pdata;
 736         struct resource *res;
 737         int ret, i;
 738
 739         dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
 740
 741         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 742         if (!res)
 743                 return -ENODEV;
 744
 745         pdata = pdev->dev.platform_data;
 746         if (!pdata) {
 747                 dev_err(&pdev->dev,"No platform_data available\n");
 748                 return -ENOMEM;
 749         }
 750
 751         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
 752         if (!info)
 753                 return -ENOMEM;
 754
 755         fbi = info->par;
 756
 757         if (!fb_mode)
 758                 fb_mode = pdata->mode[0].mode.name;
 759
 760         platform_set_drvdata(pdev, info);
 761
 762         ret = imxfb_init_fbinfo(pdev);
 763         if (ret < 0)
 764                 goto failed_init;
 765
 766         res = request_mem_region(res->start, resource_size(res),
 767                                 DRIVER_NAME);
 768         if (!res) {
 769                 ret = -EBUSY;
 770                 goto failed_req;
 771         }
 772
 773         fbi->clk = clk_get(&pdev->dev, NULL);
 774         if (IS_ERR(fbi->clk)) {
 775                 ret = PTR_ERR(fbi->clk);
 776                 dev_err(&pdev->dev, "unable to get clock: %d\n", ret);
 777                 goto failed_getclock;
 778         }
 779
 780         fbi->regs = ioremap(res->start, resource_size(res));
 781         if (fbi->regs == NULL) {
 782                 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
 783                 goto failed_ioremap;
 784         }
 785
 786         if (!pdata->fixed_screen_cpu) {
 787                 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
 788                 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
 789                                 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
 790
 791                 if (!fbi->map_cpu) {
 792                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
 793                         ret = -ENOMEM;
 794                         goto failed_map;
 795                 }
 796
 797                 info->screen_base = fbi->map_cpu;
 798                 fbi->screen_cpu = fbi->map_cpu;
 799                 fbi->screen_dma = fbi->map_dma;
 800                 info->fix.smem_start = fbi->screen_dma;
 801         } else {
 802                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
 803                 fbi->map_cpu = pdata->fixed_screen_cpu;
 804                 fbi->map_dma = pdata->fixed_screen_dma;
 805                 info->screen_base = fbi->map_cpu;
 806                 fbi->screen_cpu = fbi->map_cpu;
 807                 fbi->screen_dma = fbi->map_dma;
 808                 info->fix.smem_start = fbi->screen_dma;
 809         }
 810
 811         if (pdata->init) {
 812                 ret = pdata->init(fbi->pdev);
 813                 if (ret)
 814                         goto failed_platform_init;
 815         }
 816
 817         fbi->mode = pdata->mode;
 818         fbi->num_modes = pdata->num_modes;
 819
 820         INIT_LIST_HEAD(&info->modelist);
 821         for (i = 0; i < pdata->num_modes; i++)
 822                 fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
 823
 824         /*
 825          * This makes sure that our colour bitfield
 826          * descriptors are correctly initialised.
 827          */
 828         imxfb_check_var(&info->var, info);
 829
 830         ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
 831         if (ret < 0)
 832                 goto failed_cmap;
 833
 834         imxfb_set_par(info);
 835         ret = register_framebuffer(info);
 836         if (ret < 0) {
 837                 dev_err(&pdev->dev, "failed to register framebuffer\n");
 838                 goto failed_register;
 839         }
 840
 841         imxfb_enable_controller(fbi);
 842         fbi->pdev = pdev;
 843 #ifdef PWMR_BACKLIGHT_AVAILABLE
 844         imxfb_init_backlight(fbi);
 845 #endif
 846
 847         return 0;
 848
 849 failed_register:
 850         fb_dealloc_cmap(&info->cmap);
 851 failed_cmap:
 852         if (pdata->exit)
 853                 pdata->exit(fbi->pdev);
 854 failed_platform_init:
 855         if (!pdata->fixed_screen_cpu)
 856                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
 857                         fbi->map_dma);
 858 failed_map:
 859         iounmap(fbi->regs);
 860 failed_ioremap:
 861         clk_put(fbi->clk);
 862 failed_getclock:
 863         release_mem_region(res->start, resource_size(res));
 864 failed_req:
 865         kfree(info->pseudo_palette);
 866 failed_init:
 867         platform_set_drvdata(pdev, NULL);
 868         framebuffer_release(info);
 869         return ret;
 870 }
 871
 872 static int __devexit imxfb_remove(struct platform_device *pdev)
 873 {
 874         struct imx_fb_platform_data *pdata;
 875         struct fb_info *info = platform_get_drvdata(pdev);
 876         struct imxfb_info *fbi = info->par;
 877         struct resource *res;
 878
 879         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 880
 881         imxfb_disable_controller(fbi);
 882
 883 #ifdef PWMR_BACKLIGHT_AVAILABLE
 884         imxfb_exit_backlight(fbi);
 885 #endif
 886         unregister_framebuffer(info);
 887
 888         pdata = pdev->dev.platform_data;
 889         if (pdata->exit)
 890                 pdata->exit(fbi->pdev);
 891
 892         fb_dealloc_cmap(&info->cmap);
 893         kfree(info->pseudo_palette);
 894         framebuffer_release(info);
 895
 896         iounmap(fbi->regs);
 897         release_mem_region(res->start, resource_size(res));
 898         clk_disable(fbi->clk);
 899         clk_put(fbi->clk);
 900
 901         platform_set_drvdata(pdev, NULL);
 902
 903         return 0;
 904 }
 905
 906 void  imxfb_shutdown(struct platform_device * dev)
 907 {
 908         struct fb_info *info = platform_get_drvdata(dev);
 909         struct imxfb_info *fbi = info->par;
 910         imxfb_disable_controller(fbi);
 911 }
 912
 913 static struct platform_driver imxfb_driver = {
 914         .suspend        = imxfb_suspend,
 915         .resume         = imxfb_resume,
 916         .remove         = __devexit_p(imxfb_remove),
 917         .shutdown       = imxfb_shutdown,
 918         .driver         = {
 919                 .name   = DRIVER_NAME,
 920         },
 921 };
 922
 923 static int imxfb_setup(void)
 924 {
 925 #ifndef MODULE
 926         char *opt, *options = NULL;
 927
 928         if (fb_get_options("imxfb", &options))
 929                 return -ENODEV;
 930
 931         if (!options || !*options)
 932                 return 0;
 933
 934         while ((opt = strsep(&options, ",")) != NULL) {
 935                 if (!*opt)
 936                         continue;
 937                 else
 938                         fb_mode = opt;
 939         }
 940 #endif
 941         return 0;
 942 }
 943
 944 int __init imxfb_init(void)
 945 {
 946         int ret = imxfb_setup();
 947
 948         if (ret < 0)
 949                 return ret;
 950
 951         return platform_driver_probe(&imxfb_driver, imxfb_probe);
 952 }
 953
 954 static void __exit imxfb_cleanup(void)
 955 {
 956         platform_driver_unregister(&imxfb_driver);
 957 }
 958
 959 module_init(imxfb_init);
 960 module_exit(imxfb_cleanup);
 961
 962 MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
 963 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 964 MODULE_LICENSE("GPL");