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_ipg;
 135         struct clk              *clk_ahb;
 136         struct clk              *clk_per;
 137
 138         /*
 139          * These are the addresses we mapped
 140          * the framebuffer memory region to.
 141          */
 142         dma_addr_t              map_dma;
 143         u_char                  *map_cpu;
 144         u_int                   map_size;
 145
 146         u_char                  *screen_cpu;
 147         dma_addr_t              screen_dma;
 148         u_int                   palette_size;
 149
 150         dma_addr_t              dbar1;
 151         dma_addr_t              dbar2;
 152
 153         u_int                   pcr;
 154         u_int                   pwmr;
 155         u_int                   lscr1;
 156         u_int                   dmacr;
 157         u_int                   cmap_inverse:1,
 158                                 cmap_static:1,
 159                                 unused:30;
 160
 161         struct imx_fb_videomode *mode;
 162         int                     num_modes;
 163 #ifdef PWMR_BACKLIGHT_AVAILABLE
 164         struct backlight_device *bl;
 165 #endif
 166
 167         void (*lcd_power)(int);
 168         void (*backlight_power)(int);
 169 };
 170
 171 #define IMX_NAME        "IMX"
 172
 173 /*
 174  * Minimum X and Y resolutions
 175  */
 176 #define MIN_XRES        64
 177 #define MIN_YRES        64
 178
 179 /* Actually this really is 18bit support, the lowest 2 bits of each colour
 180  * are unused in hardware. We claim to have 24bit support to make software
 181  * like X work, which does not support 18bit.
 182  */
 183 static struct imxfb_rgb def_rgb_18 = {
 184         .red    = {.offset = 16, .length = 8,},
 185         .green  = {.offset = 8, .length = 8,},
 186         .blue   = {.offset = 0, .length = 8,},
 187         .transp = {.offset = 0, .length = 0,},
 188 };
 189
 190 static struct imxfb_rgb def_rgb_16_tft = {
 191         .red    = {.offset = 11, .length = 5,},
 192         .green  = {.offset = 5, .length = 6,},
 193         .blue   = {.offset = 0, .length = 5,},
 194         .transp = {.offset = 0, .length = 0,},
 195 };
 196
 197 static struct imxfb_rgb def_rgb_16_stn = {
 198         .red    = {.offset = 8, .length = 4,},
 199         .green  = {.offset = 4, .length = 4,},
 200         .blue   = {.offset = 0, .length = 4,},
 201         .transp = {.offset = 0, .length = 0,},
 202 };
 203
 204 static struct imxfb_rgb def_rgb_8 = {
 205         .red    = {.offset = 0, .length = 8,},
 206         .green  = {.offset = 0, .length = 8,},
 207         .blue   = {.offset = 0, .length = 8,},
 208         .transp = {.offset = 0, .length = 0,},
 209 };
 210
 211 static int imxfb_activate_var(struct fb_var_screeninfo *var,
 212                 struct fb_info *info);
 213
 214 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 215 {
 216         chan &= 0xffff;
 217         chan >>= 16 - bf->length;
 218         return chan << bf->offset;
 219 }
 220
 221 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
 222                 u_int trans, struct fb_info *info)
 223 {
 224         struct imxfb_info *fbi = info->par;
 225         u_int val, ret = 1;
 226
 227 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
 228         if (regno < fbi->palette_size) {
 229                 val = (CNVT_TOHW(red, 4) << 8) |
 230                       (CNVT_TOHW(green,4) << 4) |
 231                       CNVT_TOHW(blue,  4);
 232
 233                 writel(val, fbi->regs + 0x800 + (regno << 2));
 234                 ret = 0;
 235         }
 236         return ret;
 237 }
 238
 239 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 240                    u_int trans, struct fb_info *info)
 241 {
 242         struct imxfb_info *fbi = info->par;
 243         unsigned int val;
 244         int ret = 1;
 245
 246         /*
 247          * If inverse mode was selected, invert all the colours
 248          * rather than the register number.  The register number
 249          * is what you poke into the framebuffer to produce the
 250          * colour you requested.
 251          */
 252         if (fbi->cmap_inverse) {
 253                 red   = 0xffff - red;
 254                 green = 0xffff - green;
 255                 blue  = 0xffff - blue;
 256         }
 257
 258         /*
 259          * If greyscale is true, then we convert the RGB value
 260          * to greyscale no mater what visual we are using.
 261          */
 262         if (info->var.grayscale)
 263                 red = green = blue = (19595 * red + 38470 * green +
 264                                         7471 * blue) >> 16;
 265
 266         switch (info->fix.visual) {
 267         case FB_VISUAL_TRUECOLOR:
 268                 /*
 269                  * 12 or 16-bit True Colour.  We encode the RGB value
 270                  * according to the RGB bitfield information.
 271                  */
 272                 if (regno < 16) {
 273                         u32 *pal = info->pseudo_palette;
 274
 275                         val  = chan_to_field(red, &info->var.red);
 276                         val |= chan_to_field(green, &info->var.green);
 277                         val |= chan_to_field(blue, &info->var.blue);
 278
 279                         pal[regno] = val;
 280                         ret = 0;
 281                 }
 282                 break;
 283
 284         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 285         case FB_VISUAL_PSEUDOCOLOR:
 286                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
 287                 break;
 288         }
 289
 290         return ret;
 291 }
 292
 293 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
 294 {
 295         struct imx_fb_videomode *m;
 296         int i;
 297
 298         for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
 299                 if (!strcmp(m->mode.name, fb_mode))
 300                         return m;
 301         }
 302         return NULL;
 303 }
 304
 305 /*
 306  *  imxfb_check_var():
 307  *    Round up in the following order: bits_per_pixel, xres,
 308  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 309  *    bitfields, horizontal timing, vertical timing.
 310  */
 311 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 312 {
 313         struct imxfb_info *fbi = info->par;
 314         struct imxfb_rgb *rgb;
 315         const struct imx_fb_videomode *imxfb_mode;
 316         unsigned long lcd_clk;
 317         unsigned long long tmp;
 318         u32 pcr = 0;
 319
 320         if (var->xres < MIN_XRES)
 321                 var->xres = MIN_XRES;
 322         if (var->yres < MIN_YRES)
 323                 var->yres = MIN_YRES;
 324
 325         imxfb_mode = imxfb_find_mode(fbi);
 326         if (!imxfb_mode)
 327                 return -EINVAL;
 328
 329         var->xres               = imxfb_mode->mode.xres;
 330         var->yres               = imxfb_mode->mode.yres;
 331         var->bits_per_pixel     = imxfb_mode->bpp;
 332         var->pixclock           = imxfb_mode->mode.pixclock;
 333         var->hsync_len          = imxfb_mode->mode.hsync_len;
 334         var->left_margin        = imxfb_mode->mode.left_margin;
 335         var->right_margin       = imxfb_mode->mode.right_margin;
 336         var->vsync_len          = imxfb_mode->mode.vsync_len;
 337         var->upper_margin       = imxfb_mode->mode.upper_margin;
 338         var->lower_margin       = imxfb_mode->mode.lower_margin;
 339         var->sync               = imxfb_mode->mode.sync;
 340         var->xres_virtual       = max(var->xres_virtual, var->xres);
 341         var->yres_virtual       = max(var->yres_virtual, var->yres);
 342
 343         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
 344
 345         lcd_clk = clk_get_rate(fbi->clk_per);
 346
 347         tmp = var->pixclock * (unsigned long long)lcd_clk;
 348
 349         do_div(tmp, 1000000);
 350
 351         if (do_div(tmp, 1000000) > 500000)
 352                 tmp++;
 353
 354         pcr = (unsigned int)tmp;
 355
 356         if (--pcr > 0x3F) {
 357                 pcr = 0x3F;
 358                 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
 359                                 lcd_clk / pcr);
 360         }
 361
 362         switch (var->bits_per_pixel) {
 363         case 32:
 364                 pcr |= PCR_BPIX_18;
 365                 rgb = &def_rgb_18;
 366                 break;
 367         case 16:
 368         default:
 369                 if (cpu_is_mx1())
 370                         pcr |= PCR_BPIX_12;
 371                 else
 372                         pcr |= PCR_BPIX_16;
 373
 374                 if (imxfb_mode->pcr & PCR_TFT)
 375                         rgb = &def_rgb_16_tft;
 376                 else
 377                         rgb = &def_rgb_16_stn;
 378                 break;
 379         case 8:
 380                 pcr |= PCR_BPIX_8;
 381                 rgb = &def_rgb_8;
 382                 break;
 383         }
 384
 385         /* add sync polarities */
 386         pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
 387
 388         fbi->pcr = pcr;
 389
 390         /*
 391          * Copy the RGB parameters for this display
 392          * from the machine specific parameters.
 393          */
 394         var->red    = rgb->red;
 395         var->green  = rgb->green;
 396         var->blue   = rgb->blue;
 397         var->transp = rgb->transp;
 398
 399         pr_debug("RGBT length = %d:%d:%d:%d\n",
 400                 var->red.length, var->green.length, var->blue.length,
 401                 var->transp.length);
 402
 403         pr_debug("RGBT offset = %d:%d:%d:%d\n",
 404                 var->red.offset, var->green.offset, var->blue.offset,
 405                 var->transp.offset);
 406
 407         return 0;
 408 }
 409
 410 /*
 411  * imxfb_set_par():
 412  *      Set the user defined part of the display for the specified console
 413  */
 414 static int imxfb_set_par(struct fb_info *info)
 415 {
 416         struct imxfb_info *fbi = info->par;
 417         struct fb_var_screeninfo *var = &info->var;
 418
 419         if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
 420                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 421         else if (!fbi->cmap_static)
 422                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 423         else {
 424                 /*
 425                  * Some people have weird ideas about wanting static
 426                  * pseudocolor maps.  I suspect their user space
 427                  * applications are broken.
 428                  */
 429                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 430         }
 431
 432         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
 433         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 434
 435         imxfb_activate_var(var, info);
 436
 437         return 0;
 438 }
 439
 440 #ifdef PWMR_BACKLIGHT_AVAILABLE
 441 static int imxfb_bl_get_brightness(struct backlight_device *bl)
 442 {
 443         struct imxfb_info *fbi = bl_get_data(bl);
 444
 445         return readl(fbi->regs + LCDC_PWMR) & 0xFF;
 446 }
 447
 448 static int imxfb_bl_update_status(struct backlight_device *bl)
 449 {
 450         struct imxfb_info *fbi = bl_get_data(bl);
 451         int brightness = bl->props.brightness;
 452
 453         if (bl->props.power != FB_BLANK_UNBLANK)
 454                 brightness = 0;
 455         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 456                 brightness = 0;
 457
 458         fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
 459
 460         if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
 461                 clk_prepare_enable(fbi->clk_ipg);
 462                 clk_prepare_enable(fbi->clk_ahb);
 463                 clk_prepare_enable(fbi->clk_per);
 464         }
 465         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 466         if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
 467                 clk_disable_unprepare(fbi->clk_per);
 468                 clk_disable_unprepare(fbi->clk_ahb);
 469                 clk_disable_unprepare(fbi->clk_ipg);
 470         }
 471
 472         return 0;
 473 }
 474
 475 static const struct backlight_ops imxfb_lcdc_bl_ops = {
 476         .update_status = imxfb_bl_update_status,
 477         .get_brightness = imxfb_bl_get_brightness,
 478 };
 479
 480 static void imxfb_init_backlight(struct imxfb_info *fbi)
 481 {
 482         struct backlight_properties props;
 483         struct backlight_device *bl;
 484
 485         if (fbi->bl)
 486                 return;
 487
 488         memset(&props, 0, sizeof(struct backlight_properties));
 489         props.max_brightness = 0xff;
 490         props.type = BACKLIGHT_RAW;
 491         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 492
 493         bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
 494                                        &imxfb_lcdc_bl_ops, &props);
 495         if (IS_ERR(bl)) {
 496                 dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
 497                                 PTR_ERR(bl));
 498                 return;
 499         }
 500
 501         fbi->bl = bl;
 502         bl->props.power = FB_BLANK_UNBLANK;
 503         bl->props.fb_blank = FB_BLANK_UNBLANK;
 504         bl->props.brightness = imxfb_bl_get_brightness(bl);
 505 }
 506
 507 static void imxfb_exit_backlight(struct imxfb_info *fbi)
 508 {
 509         if (fbi->bl)
 510                 backlight_device_unregister(fbi->bl);
 511 }
 512 #endif
 513
 514 static void imxfb_enable_controller(struct imxfb_info *fbi)
 515 {
 516         pr_debug("Enabling LCD controller\n");
 517
 518         writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
 519
 520         /* panning offset 0 (0 pixel offset)        */
 521         writel(0x00000000, fbi->regs + LCDC_POS);
 522
 523         /* disable hardware cursor */
 524         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
 525                 fbi->regs + LCDC_CPOS);
 526
 527         /*
 528          * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
 529          * on other SoCs
 530          */
 531         writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
 532
 533         clk_prepare_enable(fbi->clk_ipg);
 534         clk_prepare_enable(fbi->clk_ahb);
 535         clk_prepare_enable(fbi->clk_per);
 536
 537         if (fbi->backlight_power)
 538                 fbi->backlight_power(1);
 539         if (fbi->lcd_power)
 540                 fbi->lcd_power(1);
 541 }
 542
 543 static void imxfb_disable_controller(struct imxfb_info *fbi)
 544 {
 545         pr_debug("Disabling LCD controller\n");
 546
 547         if (fbi->backlight_power)
 548                 fbi->backlight_power(0);
 549         if (fbi->lcd_power)
 550                 fbi->lcd_power(0);
 551
 552         clk_disable_unprepare(fbi->clk_per);
 553         clk_disable_unprepare(fbi->clk_ipg);
 554         clk_disable_unprepare(fbi->clk_ahb);
 555
 556         writel(0, fbi->regs + LCDC_RMCR);
 557 }
 558
 559 static int imxfb_blank(int blank, struct fb_info *info)
 560 {
 561         struct imxfb_info *fbi = info->par;
 562
 563         pr_debug("imxfb_blank: blank=%d\n", blank);
 564
 565         switch (blank) {
 566         case FB_BLANK_POWERDOWN:
 567         case FB_BLANK_VSYNC_SUSPEND:
 568         case FB_BLANK_HSYNC_SUSPEND:
 569         case FB_BLANK_NORMAL:
 570                 imxfb_disable_controller(fbi);
 571                 break;
 572
 573         case FB_BLANK_UNBLANK:
 574                 imxfb_enable_controller(fbi);
 575                 break;
 576         }
 577         return 0;
 578 }
 579
 580 static struct fb_ops imxfb_ops = {
 581         .owner          = THIS_MODULE,
 582         .fb_check_var   = imxfb_check_var,
 583         .fb_set_par     = imxfb_set_par,
 584         .fb_setcolreg   = imxfb_setcolreg,
 585         .fb_fillrect    = cfb_fillrect,
 586         .fb_copyarea    = cfb_copyarea,
 587         .fb_imageblit   = cfb_imageblit,
 588         .fb_blank       = imxfb_blank,
 589 };
 590
 591 /*
 592  * imxfb_activate_var():
 593  *      Configures LCD Controller based on entries in var parameter.  Settings are
 594  *      only written to the controller if changes were made.
 595  */
 596 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
 597 {
 598         struct imxfb_info *fbi = info->par;
 599
 600         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 601                 var->xres, var->hsync_len,
 602                 var->left_margin, var->right_margin);
 603         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 604                 var->yres, var->vsync_len,
 605                 var->upper_margin, var->lower_margin);
 606
 607 #if DEBUG_VAR
 608         if (var->xres < 16        || var->xres > 1024)
 609                 printk(KERN_ERR "%s: invalid xres %d\n",
 610                         info->fix.id, var->xres);
 611         if (var->hsync_len < 1    || var->hsync_len > 64)
 612                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 613                         info->fix.id, var->hsync_len);
 614         if (var->left_margin > 255)
 615                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 616                         info->fix.id, var->left_margin);
 617         if (var->right_margin > 255)
 618                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 619                         info->fix.id, var->right_margin);
 620         if (var->yres < 1 || var->yres > YMAX_MASK)
 621                 printk(KERN_ERR "%s: invalid yres %d\n",
 622                         info->fix.id, var->yres);
 623         if (var->vsync_len > 100)
 624                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 625                         info->fix.id, var->vsync_len);
 626         if (var->upper_margin > 63)
 627                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 628                         info->fix.id, var->upper_margin);
 629         if (var->lower_margin > 255)
 630                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 631                         info->fix.id, var->lower_margin);
 632 #endif
 633
 634         /* physical screen start address            */
 635         writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
 636                 fbi->regs + LCDC_VPW);
 637
 638         writel(HCR_H_WIDTH(var->hsync_len - 1) |
 639                 HCR_H_WAIT_1(var->right_margin - 1) |
 640                 HCR_H_WAIT_2(var->left_margin - 3),
 641                 fbi->regs + LCDC_HCR);
 642
 643         writel(VCR_V_WIDTH(var->vsync_len) |
 644                 VCR_V_WAIT_1(var->lower_margin) |
 645                 VCR_V_WAIT_2(var->upper_margin),
 646                 fbi->regs + LCDC_VCR);
 647
 648         writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
 649                         fbi->regs + LCDC_SIZE);
 650
 651         writel(fbi->pcr, fbi->regs + LCDC_PCR);
 652 #ifndef PWMR_BACKLIGHT_AVAILABLE
 653         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 654 #endif
 655         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
 656         writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
 657
 658         return 0;
 659 }
 660
 661 #ifdef CONFIG_PM
 662 /*
 663  * Power management hooks.  Note that we won't be called from IRQ context,
 664  * unlike the blank functions above, so we may sleep.
 665  */
 666 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
 667 {
 668         struct fb_info *info = platform_get_drvdata(dev);
 669         struct imxfb_info *fbi = info->par;
 670
 671         pr_debug("%s\n", __func__);
 672
 673         imxfb_disable_controller(fbi);
 674         return 0;
 675 }
 676
 677 static int imxfb_resume(struct platform_device *dev)
 678 {
 679         struct fb_info *info = platform_get_drvdata(dev);
 680         struct imxfb_info *fbi = info->par;
 681
 682         pr_debug("%s\n", __func__);
 683
 684         imxfb_enable_controller(fbi);
 685         return 0;
 686 }
 687 #else
 688 #define imxfb_suspend   NULL
 689 #define imxfb_resume    NULL
 690 #endif
 691
 692 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
 693 {
 694         struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
 695         struct fb_info *info = dev_get_drvdata(&pdev->dev);
 696         struct imxfb_info *fbi = info->par;
 697         struct imx_fb_videomode *m;
 698         int i;
 699
 700         pr_debug("%s\n",__func__);
 701
 702         info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
 703         if (!info->pseudo_palette)
 704                 return -ENOMEM;
 705
 706         memset(fbi, 0, sizeof(struct imxfb_info));
 707
 708         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 709
 710         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
 711         info->fix.type_aux              = 0;
 712         info->fix.xpanstep              = 0;
 713         info->fix.ypanstep              = 0;
 714         info->fix.ywrapstep             = 0;
 715         info->fix.accel                 = FB_ACCEL_NONE;
 716
 717         info->var.nonstd                = 0;
 718         info->var.activate              = FB_ACTIVATE_NOW;
 719         info->var.height                = -1;
 720         info->var.width = -1;
 721         info->var.accel_flags           = 0;
 722         info->var.vmode                 = FB_VMODE_NONINTERLACED;
 723
 724         info->fbops                     = &imxfb_ops;
 725         info->flags                     = FBINFO_FLAG_DEFAULT |
 726                                           FBINFO_READS_FAST;
 727         info->var.grayscale             = pdata->cmap_greyscale;
 728         fbi->cmap_inverse               = pdata->cmap_inverse;
 729         fbi->cmap_static                = pdata->cmap_static;
 730         fbi->lscr1                      = pdata->lscr1;
 731         fbi->dmacr                      = pdata->dmacr;
 732         fbi->pwmr                       = pdata->pwmr;
 733         fbi->lcd_power                  = pdata->lcd_power;
 734         fbi->backlight_power            = pdata->backlight_power;
 735
 736         for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
 737                 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
 738                                 m->mode.xres * m->mode.yres * m->bpp / 8);
 739
 740         return 0;
 741 }
 742
 743 static int __init imxfb_probe(struct platform_device *pdev)
 744 {
 745         struct imxfb_info *fbi;
 746         struct fb_info *info;
 747         struct imx_fb_platform_data *pdata;
 748         struct resource *res;
 749         int ret, i;
 750
 751         dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
 752
 753         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 754         if (!res)
 755                 return -ENODEV;
 756
 757         pdata = pdev->dev.platform_data;
 758         if (!pdata) {
 759                 dev_err(&pdev->dev,"No platform_data available\n");
 760                 return -ENOMEM;
 761         }
 762
 763         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
 764         if (!info)
 765                 return -ENOMEM;
 766
 767         fbi = info->par;
 768
 769         if (!fb_mode)
 770                 fb_mode = pdata->mode[0].mode.name;
 771
 772         platform_set_drvdata(pdev, info);
 773
 774         ret = imxfb_init_fbinfo(pdev);
 775         if (ret < 0)
 776                 goto failed_init;
 777
 778         res = request_mem_region(res->start, resource_size(res),
 779                                 DRIVER_NAME);
 780         if (!res) {
 781                 ret = -EBUSY;
 782                 goto failed_req;
 783         }
 784
 785         fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
 786         if (IS_ERR(fbi->clk_ipg)) {
 787                 ret = PTR_ERR(fbi->clk_ipg);
 788                 goto failed_getclock;
 789         }
 790
 791         fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
 792         if (IS_ERR(fbi->clk_ahb)) {
 793                 ret = PTR_ERR(fbi->clk_ahb);
 794                 goto failed_getclock;
 795         }
 796
 797         fbi->clk_per = devm_clk_get(&pdev->dev, "per");
 798         if (IS_ERR(fbi->clk_per)) {
 799                 ret = PTR_ERR(fbi->clk_per);
 800                 goto failed_getclock;
 801         }
 802
 803         fbi->regs = ioremap(res->start, resource_size(res));
 804         if (fbi->regs == NULL) {
 805                 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
 806                 goto failed_ioremap;
 807         }
 808
 809         if (!pdata->fixed_screen_cpu) {
 810                 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
 811                 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
 812                                 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
 813
 814                 if (!fbi->map_cpu) {
 815                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
 816                         ret = -ENOMEM;
 817                         goto failed_map;
 818                 }
 819
 820                 info->screen_base = fbi->map_cpu;
 821                 fbi->screen_cpu = fbi->map_cpu;
 822                 fbi->screen_dma = fbi->map_dma;
 823                 info->fix.smem_start = fbi->screen_dma;
 824         } else {
 825                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
 826                 fbi->map_cpu = pdata->fixed_screen_cpu;
 827                 fbi->map_dma = pdata->fixed_screen_dma;
 828                 info->screen_base = fbi->map_cpu;
 829                 fbi->screen_cpu = fbi->map_cpu;
 830                 fbi->screen_dma = fbi->map_dma;
 831                 info->fix.smem_start = fbi->screen_dma;
 832         }
 833
 834         if (pdata->init) {
 835                 ret = pdata->init(fbi->pdev);
 836                 if (ret)
 837                         goto failed_platform_init;
 838         }
 839
 840         fbi->mode = pdata->mode;
 841         fbi->num_modes = pdata->num_modes;
 842
 843         INIT_LIST_HEAD(&info->modelist);
 844         for (i = 0; i < pdata->num_modes; i++)
 845                 fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
 846
 847         /*
 848          * This makes sure that our colour bitfield
 849          * descriptors are correctly initialised.
 850          */
 851         imxfb_check_var(&info->var, info);
 852
 853         ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
 854         if (ret < 0)
 855                 goto failed_cmap;
 856
 857         imxfb_set_par(info);
 858         ret = register_framebuffer(info);
 859         if (ret < 0) {
 860                 dev_err(&pdev->dev, "failed to register framebuffer\n");
 861                 goto failed_register;
 862         }
 863
 864         imxfb_enable_controller(fbi);
 865         fbi->pdev = pdev;
 866 #ifdef PWMR_BACKLIGHT_AVAILABLE
 867         imxfb_init_backlight(fbi);
 868 #endif
 869
 870         return 0;
 871
 872 failed_register:
 873         fb_dealloc_cmap(&info->cmap);
 874 failed_cmap:
 875         if (pdata->exit)
 876                 pdata->exit(fbi->pdev);
 877 failed_platform_init:
 878         if (!pdata->fixed_screen_cpu)
 879                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
 880                         fbi->map_dma);
 881 failed_map:
 882         iounmap(fbi->regs);
 883 failed_ioremap:
 884 failed_getclock:
 885         release_mem_region(res->start, resource_size(res));
 886 failed_req:
 887         kfree(info->pseudo_palette);
 888 failed_init:
 889         platform_set_drvdata(pdev, NULL);
 890         framebuffer_release(info);
 891         return ret;
 892 }
 893
 894 static int __devexit imxfb_remove(struct platform_device *pdev)
 895 {
 896         struct imx_fb_platform_data *pdata;
 897         struct fb_info *info = platform_get_drvdata(pdev);
 898         struct imxfb_info *fbi = info->par;
 899         struct resource *res;
 900
 901         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 902
 903         imxfb_disable_controller(fbi);
 904
 905 #ifdef PWMR_BACKLIGHT_AVAILABLE
 906         imxfb_exit_backlight(fbi);
 907 #endif
 908         unregister_framebuffer(info);
 909
 910         pdata = pdev->dev.platform_data;
 911         if (pdata->exit)
 912                 pdata->exit(fbi->pdev);
 913
 914         fb_dealloc_cmap(&info->cmap);
 915         kfree(info->pseudo_palette);
 916         framebuffer_release(info);
 917
 918         iounmap(fbi->regs);
 919         release_mem_region(res->start, resource_size(res));
 920
 921         platform_set_drvdata(pdev, NULL);
 922
 923         return 0;
 924 }
 925
 926 void  imxfb_shutdown(struct platform_device * dev)
 927 {
 928         struct fb_info *info = platform_get_drvdata(dev);
 929         struct imxfb_info *fbi = info->par;
 930         imxfb_disable_controller(fbi);
 931 }
 932
 933 static struct platform_driver imxfb_driver = {
 934         .suspend        = imxfb_suspend,
 935         .resume         = imxfb_resume,
 936         .remove         = __devexit_p(imxfb_remove),
 937         .shutdown       = imxfb_shutdown,
 938         .driver         = {
 939                 .name   = DRIVER_NAME,
 940         },
 941 };
 942
 943 static int imxfb_setup(void)
 944 {
 945 #ifndef MODULE
 946         char *opt, *options = NULL;
 947
 948         if (fb_get_options("imxfb", &options))
 949                 return -ENODEV;
 950
 951         if (!options || !*options)
 952                 return 0;
 953
 954         while ((opt = strsep(&options, ",")) != NULL) {
 955                 if (!*opt)
 956                         continue;
 957                 else
 958                         fb_mode = opt;
 959         }
 960 #endif
 961         return 0;
 962 }
 963
 964 int __init imxfb_init(void)
 965 {
 966         int ret = imxfb_setup();
 967
 968         if (ret < 0)
 969                 return ret;
 970
 971         return platform_driver_probe(&imxfb_driver, imxfb_probe);
 972 }
 973
 974 static void __exit imxfb_cleanup(void)
 975 {
 976         platform_driver_unregister(&imxfb_driver);
 977 }
 978
 979 module_init(imxfb_init);
 980 module_exit(imxfb_cleanup);
 981
 982 MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
 983 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 984 MODULE_LICENSE("GPL");