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 #ifdef CONFIG_ARCH_MX1
  69 #define CPOS_CYP(y)     ((y) & 0x1ff)
  70 #else
  71 #define CPOS_CYP(y)     ((y) & 0x3ff)
  72 #endif
  73
  74 #define LCDC_LCWHB      0x10
  75 #define LCWHB_BK_EN     (1<<31)
  76 #define LCWHB_CW(w)     (((w) & 0x1f) << 24)
  77 #define LCWHB_CH(h)     (((h) & 0x1f) << 16)
  78 #define LCWHB_BD(x)     ((x) & 0xff)
  79
  80 #define LCDC_LCHCC      0x14
  81
  82 #ifdef CONFIG_ARCH_MX1
  83 #define LCHCC_CUR_COL_R(r) (((r) & 0x1f) << 11)
  84 #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 5)
  85 #define LCHCC_CUR_COL_B(b) ((b) & 0x1f)
  86 #else
  87 #define LCHCC_CUR_COL_R(r) (((r) & 0x3f) << 12)
  88 #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 6)
  89 #define LCHCC_CUR_COL_B(b) ((b) & 0x3f)
  90 #endif
  91
  92 #define LCDC_PCR        0x18
  93
  94 #define LCDC_HCR        0x1C
  95 #define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
  96 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
  97 #define HCR_H_WAIT_2(x) ((x) & 0xff)
  98
  99 #define LCDC_VCR        0x20
 100 #define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
 101 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
 102 #define VCR_V_WAIT_2(x) ((x) & 0xff)
 103
 104 #define LCDC_POS        0x24
 105 #define POS_POS(x)      ((x) & 1f)
 106
 107 #define LCDC_LSCR1      0x28
 108 /* bit fields in imxfb.h */
 109
 110 #define LCDC_PWMR       0x2C
 111 /* bit fields in imxfb.h */
 112
 113 #define LCDC_DMACR      0x30
 114 /* bit fields in imxfb.h */
 115
 116 #define LCDC_RMCR       0x34
 117
 118 #ifdef CONFIG_ARCH_MX1
 119 #define RMCR_LCDC_EN    (1<<1)
 120 #else
 121 #define RMCR_LCDC_EN    0
 122 #endif
 123
 124 #define RMCR_SELF_REF   (1<<0)
 125
 126 #define LCDC_LCDICR     0x38
 127 #define LCDICR_INT_SYN  (1<<2)
 128 #define LCDICR_INT_CON  (1)
 129
 130 #define LCDC_LCDISR     0x40
 131 #define LCDISR_UDR_ERR  (1<<3)
 132 #define LCDISR_ERR_RES  (1<<2)
 133 #define LCDISR_EOF      (1<<1)
 134 #define LCDISR_BOF      (1<<0)
 135
 136 /* Used fb-mode. Can be set on kernel command line, therefore file-static. */
 137 static const char *fb_mode;
 138
 139
 140 /*
 141  * These are the bitfields for each
 142  * display depth that we support.
 143  */
 144 struct imxfb_rgb {
 145         struct fb_bitfield      red;
 146         struct fb_bitfield      green;
 147         struct fb_bitfield      blue;
 148         struct fb_bitfield      transp;
 149 };
 150
 151 struct imxfb_info {
 152         struct platform_device  *pdev;
 153         void __iomem            *regs;
 154         struct clk              *clk;
 155
 156         /*
 157          * These are the addresses we mapped
 158          * the framebuffer memory region to.
 159          */
 160         dma_addr_t              map_dma;
 161         u_char                  *map_cpu;
 162         u_int                   map_size;
 163
 164         u_char                  *screen_cpu;
 165         dma_addr_t              screen_dma;
 166         u_int                   palette_size;
 167
 168         dma_addr_t              dbar1;
 169         dma_addr_t              dbar2;
 170
 171         u_int                   pcr;
 172         u_int                   pwmr;
 173         u_int                   lscr1;
 174         u_int                   dmacr;
 175         u_int                   cmap_inverse:1,
 176                                 cmap_static:1,
 177                                 unused:30;
 178
 179         struct imx_fb_videomode *mode;
 180         int                     num_modes;
 181 #ifdef PWMR_BACKLIGHT_AVAILABLE
 182         struct backlight_device *bl;
 183 #endif
 184
 185         void (*lcd_power)(int);
 186         void (*backlight_power)(int);
 187 };
 188
 189 #define IMX_NAME        "IMX"
 190
 191 /*
 192  * Minimum X and Y resolutions
 193  */
 194 #define MIN_XRES        64
 195 #define MIN_YRES        64
 196
 197 /* Actually this really is 18bit support, the lowest 2 bits of each colour
 198  * are unused in hardware. We claim to have 24bit support to make software
 199  * like X work, which does not support 18bit.
 200  */
 201 static struct imxfb_rgb def_rgb_18 = {
 202         .red    = {.offset = 16, .length = 8,},
 203         .green  = {.offset = 8, .length = 8,},
 204         .blue   = {.offset = 0, .length = 8,},
 205         .transp = {.offset = 0, .length = 0,},
 206 };
 207
 208 static struct imxfb_rgb def_rgb_16_tft = {
 209         .red    = {.offset = 11, .length = 5,},
 210         .green  = {.offset = 5, .length = 6,},
 211         .blue   = {.offset = 0, .length = 5,},
 212         .transp = {.offset = 0, .length = 0,},
 213 };
 214
 215 static struct imxfb_rgb def_rgb_16_stn = {
 216         .red    = {.offset = 8, .length = 4,},
 217         .green  = {.offset = 4, .length = 4,},
 218         .blue   = {.offset = 0, .length = 4,},
 219         .transp = {.offset = 0, .length = 0,},
 220 };
 221
 222 static struct imxfb_rgb def_rgb_8 = {
 223         .red    = {.offset = 0, .length = 8,},
 224         .green  = {.offset = 0, .length = 8,},
 225         .blue   = {.offset = 0, .length = 8,},
 226         .transp = {.offset = 0, .length = 0,},
 227 };
 228
 229 static int imxfb_activate_var(struct fb_var_screeninfo *var,
 230                 struct fb_info *info);
 231
 232 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 233 {
 234         chan &= 0xffff;
 235         chan >>= 16 - bf->length;
 236         return chan << bf->offset;
 237 }
 238
 239 static int imxfb_setpalettereg(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         u_int val, ret = 1;
 244
 245 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
 246         if (regno < fbi->palette_size) {
 247                 val = (CNVT_TOHW(red, 4) << 8) |
 248                       (CNVT_TOHW(green,4) << 4) |
 249                       CNVT_TOHW(blue,  4);
 250
 251                 writel(val, fbi->regs + 0x800 + (regno << 2));
 252                 ret = 0;
 253         }
 254         return ret;
 255 }
 256
 257 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 258                    u_int trans, struct fb_info *info)
 259 {
 260         struct imxfb_info *fbi = info->par;
 261         unsigned int val;
 262         int ret = 1;
 263
 264         /*
 265          * If inverse mode was selected, invert all the colours
 266          * rather than the register number.  The register number
 267          * is what you poke into the framebuffer to produce the
 268          * colour you requested.
 269          */
 270         if (fbi->cmap_inverse) {
 271                 red   = 0xffff - red;
 272                 green = 0xffff - green;
 273                 blue  = 0xffff - blue;
 274         }
 275
 276         /*
 277          * If greyscale is true, then we convert the RGB value
 278          * to greyscale no mater what visual we are using.
 279          */
 280         if (info->var.grayscale)
 281                 red = green = blue = (19595 * red + 38470 * green +
 282                                         7471 * blue) >> 16;
 283
 284         switch (info->fix.visual) {
 285         case FB_VISUAL_TRUECOLOR:
 286                 /*
 287                  * 12 or 16-bit True Colour.  We encode the RGB value
 288                  * according to the RGB bitfield information.
 289                  */
 290                 if (regno < 16) {
 291                         u32 *pal = info->pseudo_palette;
 292
 293                         val  = chan_to_field(red, &info->var.red);
 294                         val |= chan_to_field(green, &info->var.green);
 295                         val |= chan_to_field(blue, &info->var.blue);
 296
 297                         pal[regno] = val;
 298                         ret = 0;
 299                 }
 300                 break;
 301
 302         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 303         case FB_VISUAL_PSEUDOCOLOR:
 304                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
 305                 break;
 306         }
 307
 308         return ret;
 309 }
 310
 311 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
 312 {
 313         struct imx_fb_videomode *m;
 314         int i;
 315
 316         for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
 317                 if (!strcmp(m->mode.name, fb_mode))
 318                         return m;
 319         }
 320         return NULL;
 321 }
 322
 323 /*
 324  *  imxfb_check_var():
 325  *    Round up in the following order: bits_per_pixel, xres,
 326  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 327  *    bitfields, horizontal timing, vertical timing.
 328  */
 329 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 330 {
 331         struct imxfb_info *fbi = info->par;
 332         struct imxfb_rgb *rgb;
 333         const struct imx_fb_videomode *imxfb_mode;
 334         unsigned long lcd_clk;
 335         unsigned long long tmp;
 336         u32 pcr = 0;
 337
 338         if (var->xres < MIN_XRES)
 339                 var->xres = MIN_XRES;
 340         if (var->yres < MIN_YRES)
 341                 var->yres = MIN_YRES;
 342
 343         imxfb_mode = imxfb_find_mode(fbi);
 344         if (!imxfb_mode)
 345                 return -EINVAL;
 346
 347         var->xres               = imxfb_mode->mode.xres;
 348         var->yres               = imxfb_mode->mode.yres;
 349         var->bits_per_pixel     = imxfb_mode->bpp;
 350         var->pixclock           = imxfb_mode->mode.pixclock;
 351         var->hsync_len          = imxfb_mode->mode.hsync_len;
 352         var->left_margin        = imxfb_mode->mode.left_margin;
 353         var->right_margin       = imxfb_mode->mode.right_margin;
 354         var->vsync_len          = imxfb_mode->mode.vsync_len;
 355         var->upper_margin       = imxfb_mode->mode.upper_margin;
 356         var->lower_margin       = imxfb_mode->mode.lower_margin;
 357         var->sync               = imxfb_mode->mode.sync;
 358         var->xres_virtual       = max(var->xres_virtual, var->xres);
 359         var->yres_virtual       = max(var->yres_virtual, var->yres);
 360
 361         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
 362
 363         lcd_clk = clk_get_rate(fbi->clk);
 364
 365         tmp = var->pixclock * (unsigned long long)lcd_clk;
 366
 367         do_div(tmp, 1000000);
 368
 369         if (do_div(tmp, 1000000) > 500000)
 370                 tmp++;
 371
 372         pcr = (unsigned int)tmp;
 373
 374         if (--pcr > 0x3F) {
 375                 pcr = 0x3F;
 376                 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
 377                                 lcd_clk / pcr);
 378         }
 379
 380         switch (var->bits_per_pixel) {
 381         case 32:
 382                 pcr |= PCR_BPIX_18;
 383                 rgb = &def_rgb_18;
 384                 break;
 385         case 16:
 386         default:
 387                 if (cpu_is_mx1())
 388                         pcr |= PCR_BPIX_12;
 389                 else
 390                         pcr |= PCR_BPIX_16;
 391
 392                 if (imxfb_mode->pcr & PCR_TFT)
 393                         rgb = &def_rgb_16_tft;
 394                 else
 395                         rgb = &def_rgb_16_stn;
 396                 break;
 397         case 8:
 398                 pcr |= PCR_BPIX_8;
 399                 rgb = &def_rgb_8;
 400                 break;
 401         }
 402
 403         /* add sync polarities */
 404         pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
 405
 406         fbi->pcr = pcr;
 407
 408         /*
 409          * Copy the RGB parameters for this display
 410          * from the machine specific parameters.
 411          */
 412         var->red    = rgb->red;
 413         var->green  = rgb->green;
 414         var->blue   = rgb->blue;
 415         var->transp = rgb->transp;
 416
 417         pr_debug("RGBT length = %d:%d:%d:%d\n",
 418                 var->red.length, var->green.length, var->blue.length,
 419                 var->transp.length);
 420
 421         pr_debug("RGBT offset = %d:%d:%d:%d\n",
 422                 var->red.offset, var->green.offset, var->blue.offset,
 423                 var->transp.offset);
 424
 425         return 0;
 426 }
 427
 428 /*
 429  * imxfb_set_par():
 430  *      Set the user defined part of the display for the specified console
 431  */
 432 static int imxfb_set_par(struct fb_info *info)
 433 {
 434         struct imxfb_info *fbi = info->par;
 435         struct fb_var_screeninfo *var = &info->var;
 436
 437         if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
 438                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 439         else if (!fbi->cmap_static)
 440                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 441         else {
 442                 /*
 443                  * Some people have weird ideas about wanting static
 444                  * pseudocolor maps.  I suspect their user space
 445                  * applications are broken.
 446                  */
 447                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 448         }
 449
 450         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
 451         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 452
 453         imxfb_activate_var(var, info);
 454
 455         return 0;
 456 }
 457
 458 #ifdef PWMR_BACKLIGHT_AVAILABLE
 459 static int imxfb_bl_get_brightness(struct backlight_device *bl)
 460 {
 461         struct imxfb_info *fbi = bl_get_data(bl);
 462
 463         return readl(fbi->regs + LCDC_PWMR) & 0xFF;
 464 }
 465
 466 static int imxfb_bl_update_status(struct backlight_device *bl)
 467 {
 468         struct imxfb_info *fbi = bl_get_data(bl);
 469         int brightness = bl->props.brightness;
 470
 471         if (bl->props.power != FB_BLANK_UNBLANK)
 472                 brightness = 0;
 473         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 474                 brightness = 0;
 475
 476         fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
 477
 478         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 479                 clk_enable(fbi->clk);
 480         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 481         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 482                 clk_disable(fbi->clk);
 483
 484         return 0;
 485 }
 486
 487 static const struct backlight_ops imxfb_lcdc_bl_ops = {
 488         .update_status = imxfb_bl_update_status,
 489         .get_brightness = imxfb_bl_get_brightness,
 490 };
 491
 492 static void imxfb_init_backlight(struct imxfb_info *fbi)
 493 {
 494         struct backlight_properties props;
 495         struct backlight_device *bl;
 496
 497         if (fbi->bl)
 498                 return;
 499
 500         memset(&props, 0, sizeof(struct backlight_properties));
 501         props.max_brightness = 0xff;
 502         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 503
 504         bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
 505                                        &imxfb_lcdc_bl_ops, &props);
 506         if (IS_ERR(bl)) {
 507                 dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
 508                                 PTR_ERR(bl));
 509                 return;
 510         }
 511
 512         fbi->bl = bl;
 513         bl->props.power = FB_BLANK_UNBLANK;
 514         bl->props.fb_blank = FB_BLANK_UNBLANK;
 515         bl->props.brightness = imxfb_bl_get_brightness(bl);
 516 }
 517
 518 static void imxfb_exit_backlight(struct imxfb_info *fbi)
 519 {
 520         if (fbi->bl)
 521                 backlight_device_unregister(fbi->bl);
 522 }
 523 #endif
 524
 525 static void imxfb_enable_controller(struct imxfb_info *fbi)
 526 {
 527         pr_debug("Enabling LCD controller\n");
 528
 529         writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
 530
 531         /* panning offset 0 (0 pixel offset)        */
 532         writel(0x00000000, fbi->regs + LCDC_POS);
 533
 534         /* disable hardware cursor */
 535         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
 536                 fbi->regs + LCDC_CPOS);
 537
 538         writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR);
 539
 540         clk_enable(fbi->clk);
 541
 542         if (fbi->backlight_power)
 543                 fbi->backlight_power(1);
 544         if (fbi->lcd_power)
 545                 fbi->lcd_power(1);
 546 }
 547
 548 static void imxfb_disable_controller(struct imxfb_info *fbi)
 549 {
 550         pr_debug("Disabling LCD controller\n");
 551
 552         if (fbi->backlight_power)
 553                 fbi->backlight_power(0);
 554         if (fbi->lcd_power)
 555                 fbi->lcd_power(0);
 556
 557         clk_disable(fbi->clk);
 558
 559         writel(0, fbi->regs + LCDC_RMCR);
 560 }
 561
 562 static int imxfb_blank(int blank, struct fb_info *info)
 563 {
 564         struct imxfb_info *fbi = info->par;
 565
 566         pr_debug("imxfb_blank: blank=%d\n", blank);
 567
 568         switch (blank) {
 569         case FB_BLANK_POWERDOWN:
 570         case FB_BLANK_VSYNC_SUSPEND:
 571         case FB_BLANK_HSYNC_SUSPEND:
 572         case FB_BLANK_NORMAL:
 573                 imxfb_disable_controller(fbi);
 574                 break;
 575
 576         case FB_BLANK_UNBLANK:
 577                 imxfb_enable_controller(fbi);
 578                 break;
 579         }
 580         return 0;
 581 }
 582
 583 static struct fb_ops imxfb_ops = {
 584         .owner          = THIS_MODULE,
 585         .fb_check_var   = imxfb_check_var,
 586         .fb_set_par     = imxfb_set_par,
 587         .fb_setcolreg   = imxfb_setcolreg,
 588         .fb_fillrect    = cfb_fillrect,
 589         .fb_copyarea    = cfb_copyarea,
 590         .fb_imageblit   = cfb_imageblit,
 591         .fb_blank       = imxfb_blank,
 592 };
 593
 594 /*
 595  * imxfb_activate_var():
 596  *      Configures LCD Controller based on entries in var parameter.  Settings are
 597  *      only written to the controller if changes were made.
 598  */
 599 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
 600 {
 601         struct imxfb_info *fbi = info->par;
 602
 603         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 604                 var->xres, var->hsync_len,
 605                 var->left_margin, var->right_margin);
 606         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 607                 var->yres, var->vsync_len,
 608                 var->upper_margin, var->lower_margin);
 609
 610 #if DEBUG_VAR
 611         if (var->xres < 16        || var->xres > 1024)
 612                 printk(KERN_ERR "%s: invalid xres %d\n",
 613                         info->fix.id, var->xres);
 614         if (var->hsync_len < 1    || var->hsync_len > 64)
 615                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 616                         info->fix.id, var->hsync_len);
 617         if (var->left_margin > 255)
 618                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 619                         info->fix.id, var->left_margin);
 620         if (var->right_margin > 255)
 621                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 622                         info->fix.id, var->right_margin);
 623         if (var->yres < 1 || var->yres > YMAX_MASK)
 624                 printk(KERN_ERR "%s: invalid yres %d\n",
 625                         info->fix.id, var->yres);
 626         if (var->vsync_len > 100)
 627                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 628                         info->fix.id, var->vsync_len);
 629         if (var->upper_margin > 63)
 630                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 631                         info->fix.id, var->upper_margin);
 632         if (var->lower_margin > 255)
 633                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 634                         info->fix.id, var->lower_margin);
 635 #endif
 636
 637         /* physical screen start address            */
 638         writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
 639                 fbi->regs + LCDC_VPW);
 640
 641         writel(HCR_H_WIDTH(var->hsync_len - 1) |
 642                 HCR_H_WAIT_1(var->right_margin - 1) |
 643                 HCR_H_WAIT_2(var->left_margin - 3),
 644                 fbi->regs + LCDC_HCR);
 645
 646         writel(VCR_V_WIDTH(var->vsync_len) |
 647                 VCR_V_WAIT_1(var->lower_margin) |
 648                 VCR_V_WAIT_2(var->upper_margin),
 649                 fbi->regs + LCDC_VCR);
 650
 651         writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
 652                         fbi->regs + LCDC_SIZE);
 653
 654         writel(fbi->pcr, fbi->regs + LCDC_PCR);
 655 #ifndef PWMR_BACKLIGHT_AVAILABLE
 656         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 657 #endif
 658         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
 659         writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
 660
 661         return 0;
 662 }
 663
 664 #ifdef CONFIG_PM
 665 /*
 666  * Power management hooks.  Note that we won't be called from IRQ context,
 667  * unlike the blank functions above, so we may sleep.
 668  */
 669 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
 670 {
 671         struct fb_info *info = platform_get_drvdata(dev);
 672         struct imxfb_info *fbi = info->par;
 673
 674         pr_debug("%s\n", __func__);
 675
 676         imxfb_disable_controller(fbi);
 677         return 0;
 678 }
 679
 680 static int imxfb_resume(struct platform_device *dev)
 681 {
 682         struct fb_info *info = platform_get_drvdata(dev);
 683         struct imxfb_info *fbi = info->par;
 684
 685         pr_debug("%s\n", __func__);
 686
 687         imxfb_enable_controller(fbi);
 688         return 0;
 689 }
 690 #else
 691 #define imxfb_suspend   NULL
 692 #define imxfb_resume    NULL
 693 #endif
 694
 695 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
 696 {
 697         struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
 698         struct fb_info *info = dev_get_drvdata(&pdev->dev);
 699         struct imxfb_info *fbi = info->par;
 700         struct imx_fb_videomode *m;
 701         int i;
 702
 703         pr_debug("%s\n",__func__);
 704
 705         info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
 706         if (!info->pseudo_palette)
 707                 return -ENOMEM;
 708
 709         memset(fbi, 0, sizeof(struct imxfb_info));
 710
 711         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 712
 713         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
 714         info->fix.type_aux              = 0;
 715         info->fix.xpanstep              = 0;
 716         info->fix.ypanstep              = 0;
 717         info->fix.ywrapstep             = 0;
 718         info->fix.accel                 = FB_ACCEL_NONE;
 719
 720         info->var.nonstd                = 0;
 721         info->var.activate              = FB_ACTIVATE_NOW;
 722         info->var.height                = -1;
 723         info->var.width = -1;
 724         info->var.accel_flags           = 0;
 725         info->var.vmode                 = FB_VMODE_NONINTERLACED;
 726
 727         info->fbops                     = &imxfb_ops;
 728         info->flags                     = FBINFO_FLAG_DEFAULT |
 729                                           FBINFO_READS_FAST;
 730         info->var.grayscale             = pdata->cmap_greyscale;
 731         fbi->cmap_inverse               = pdata->cmap_inverse;
 732         fbi->cmap_static                = pdata->cmap_static;
 733         fbi->lscr1                      = pdata->lscr1;
 734         fbi->dmacr                      = pdata->dmacr;
 735         fbi->pwmr                       = pdata->pwmr;
 736         fbi->lcd_power                  = pdata->lcd_power;
 737         fbi->backlight_power            = pdata->backlight_power;
 738
 739         for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
 740                 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
 741                                 m->mode.xres * m->mode.yres * m->bpp / 8);
 742
 743         return 0;
 744 }
 745
 746 static int __init imxfb_probe(struct platform_device *pdev)
 747 {
 748         struct imxfb_info *fbi;
 749         struct fb_info *info;
 750         struct imx_fb_platform_data *pdata;
 751         struct resource *res;
 752         int ret, i;
 753
 754         dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
 755
 756         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 757         if (!res)
 758                 return -ENODEV;
 759
 760         pdata = pdev->dev.platform_data;
 761         if (!pdata) {
 762                 dev_err(&pdev->dev,"No platform_data available\n");
 763                 return -ENOMEM;
 764         }
 765
 766         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
 767         if (!info)
 768                 return -ENOMEM;
 769
 770         fbi = info->par;
 771
 772         if (!fb_mode)
 773                 fb_mode = pdata->mode[0].mode.name;
 774
 775         platform_set_drvdata(pdev, info);
 776
 777         ret = imxfb_init_fbinfo(pdev);
 778         if (ret < 0)
 779                 goto failed_init;
 780
 781         res = request_mem_region(res->start, resource_size(res),
 782                                 DRIVER_NAME);
 783         if (!res) {
 784                 ret = -EBUSY;
 785                 goto failed_req;
 786         }
 787
 788         fbi->clk = clk_get(&pdev->dev, NULL);
 789         if (IS_ERR(fbi->clk)) {
 790                 ret = PTR_ERR(fbi->clk);
 791                 dev_err(&pdev->dev, "unable to get clock: %d\n", ret);
 792                 goto failed_getclock;
 793         }
 794
 795         fbi->regs = ioremap(res->start, resource_size(res));
 796         if (fbi->regs == NULL) {
 797                 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
 798                 goto failed_ioremap;
 799         }
 800
 801         if (!pdata->fixed_screen_cpu) {
 802                 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
 803                 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
 804                                 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
 805
 806                 if (!fbi->map_cpu) {
 807                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
 808                         ret = -ENOMEM;
 809                         goto failed_map;
 810                 }
 811
 812                 info->screen_base = fbi->map_cpu;
 813                 fbi->screen_cpu = fbi->map_cpu;
 814                 fbi->screen_dma = fbi->map_dma;
 815                 info->fix.smem_start = fbi->screen_dma;
 816         } else {
 817                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
 818                 fbi->map_cpu = pdata->fixed_screen_cpu;
 819                 fbi->map_dma = pdata->fixed_screen_dma;
 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         }
 825
 826         if (pdata->init) {
 827                 ret = pdata->init(fbi->pdev);
 828                 if (ret)
 829                         goto failed_platform_init;
 830         }
 831
 832         fbi->mode = pdata->mode;
 833         fbi->num_modes = pdata->num_modes;
 834
 835         INIT_LIST_HEAD(&info->modelist);
 836         for (i = 0; i < pdata->num_modes; i++)
 837                 fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
 838
 839         /*
 840          * This makes sure that our colour bitfield
 841          * descriptors are correctly initialised.
 842          */
 843         imxfb_check_var(&info->var, info);
 844
 845         ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
 846         if (ret < 0)
 847                 goto failed_cmap;
 848
 849         imxfb_set_par(info);
 850         ret = register_framebuffer(info);
 851         if (ret < 0) {
 852                 dev_err(&pdev->dev, "failed to register framebuffer\n");
 853                 goto failed_register;
 854         }
 855
 856         imxfb_enable_controller(fbi);
 857         fbi->pdev = pdev;
 858 #ifdef PWMR_BACKLIGHT_AVAILABLE
 859         imxfb_init_backlight(fbi);
 860 #endif
 861
 862         return 0;
 863
 864 failed_register:
 865         fb_dealloc_cmap(&info->cmap);
 866 failed_cmap:
 867         if (pdata->exit)
 868                 pdata->exit(fbi->pdev);
 869 failed_platform_init:
 870         if (!pdata->fixed_screen_cpu)
 871                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
 872                         fbi->map_dma);
 873 failed_map:
 874         clk_put(fbi->clk);
 875 failed_getclock:
 876         iounmap(fbi->regs);
 877 failed_ioremap:
 878         release_mem_region(res->start, resource_size(res));
 879 failed_req:
 880         kfree(info->pseudo_palette);
 881 failed_init:
 882         platform_set_drvdata(pdev, NULL);
 883         framebuffer_release(info);
 884         return ret;
 885 }
 886
 887 static int __devexit imxfb_remove(struct platform_device *pdev)
 888 {
 889         struct imx_fb_platform_data *pdata;
 890         struct fb_info *info = platform_get_drvdata(pdev);
 891         struct imxfb_info *fbi = info->par;
 892         struct resource *res;
 893
 894         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 895
 896         imxfb_disable_controller(fbi);
 897
 898 #ifdef PWMR_BACKLIGHT_AVAILABLE
 899         imxfb_exit_backlight(fbi);
 900 #endif
 901         unregister_framebuffer(info);
 902
 903         pdata = pdev->dev.platform_data;
 904         if (pdata->exit)
 905                 pdata->exit(fbi->pdev);
 906
 907         fb_dealloc_cmap(&info->cmap);
 908         kfree(info->pseudo_palette);
 909         framebuffer_release(info);
 910
 911         iounmap(fbi->regs);
 912         release_mem_region(res->start, resource_size(res));
 913         clk_disable(fbi->clk);
 914         clk_put(fbi->clk);
 915
 916         platform_set_drvdata(pdev, NULL);
 917
 918         return 0;
 919 }
 920
 921 void  imxfb_shutdown(struct platform_device * dev)
 922 {
 923         struct fb_info *info = platform_get_drvdata(dev);
 924         struct imxfb_info *fbi = info->par;
 925         imxfb_disable_controller(fbi);
 926 }
 927
 928 static struct platform_driver imxfb_driver = {
 929         .suspend        = imxfb_suspend,
 930         .resume         = imxfb_resume,
 931         .remove         = __devexit_p(imxfb_remove),
 932         .shutdown       = imxfb_shutdown,
 933         .driver         = {
 934                 .name   = DRIVER_NAME,
 935         },
 936 };
 937
 938 static int imxfb_setup(void)
 939 {
 940 #ifndef MODULE
 941         char *opt, *options = NULL;
 942
 943         if (fb_get_options("imxfb", &options))
 944                 return -ENODEV;
 945
 946         if (!options || !*options)
 947                 return 0;
 948
 949         while ((opt = strsep(&options, ",")) != NULL) {
 950                 if (!*opt)
 951                         continue;
 952                 else
 953                         fb_mode = opt;
 954         }
 955 #endif
 956         return 0;
 957 }
 958
 959 int __init imxfb_init(void)
 960 {
 961         int ret = imxfb_setup();
 962
 963         if (ret < 0)
 964                 return ret;
 965
 966         return platform_driver_probe(&imxfb_driver, imxfb_probe);
 967 }
 968
 969 static void __exit imxfb_cleanup(void)
 970 {
 971         platform_driver_unregister(&imxfb_driver);
 972 }
 973
 974 module_init(imxfb_init);
 975 module_exit(imxfb_cleanup);
 976
 977 MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
 978 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 979 MODULE_LICENSE("GPL");