drivers/video/imxfb.c

   1 /*
   2  *  Freescale i.MX Frame Buffer device driver
   3  *
   4  *  Copyright (C) 2004 Sascha Hauer, Pengutronix
   5  *   Based on acornfb.c Copyright (C) Russell King.
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file COPYING in the main directory of this archive for
   9  * more details.
  10  *
  11  * Please direct your questions and comments on this driver to the following
  12  * email address:
  13  *
  14  *      linux-arm-kernel@lists.arm.linux.org.uk
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/errno.h>
  20 #include <linux/string.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/fb.h>
  25 #include <linux/delay.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/cpufreq.h>
  29 #include <linux/clk.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/dma-mapping.h>
  32 #include <linux/io.h>
  33 #include <linux/math64.h>
  34
  35 #include <mach/imxfb.h>
  36 #include <mach/hardware.h>
  37
  38 /*
  39  * Complain if VAR is out of range.
  40  */
  41 #define DEBUG_VAR 1
  42
  43 #define DRIVER_NAME "imx-fb"
  44
  45 #define LCDC_SSA        0x00
  46
  47 #define LCDC_SIZE       0x04
  48 #define SIZE_XMAX(x)    ((((x) >> 4) & 0x3f) << 20)
  49
  50 #ifdef CONFIG_ARCH_MX1
  51 #define SIZE_YMAX(y)    ((y) & 0x1ff)
  52 #else
  53 #define SIZE_YMAX(y)    ((y) & 0x3ff)
  54 #endif
  55
  56 #define LCDC_VPW        0x08
  57 #define VPW_VPW(x)      ((x) & 0x3ff)
  58
  59 #define LCDC_CPOS       0x0C
  60 #define CPOS_CC1        (1<<31)
  61 #define CPOS_CC0        (1<<30)
  62 #define CPOS_OP         (1<<28)
  63 #define CPOS_CXP(x)     (((x) & 3ff) << 16)
  64
  65 #ifdef CONFIG_ARCH_MX1
  66 #define CPOS_CYP(y)     ((y) & 0x1ff)
  67 #else
  68 #define CPOS_CYP(y)     ((y) & 0x3ff)
  69 #endif
  70
  71 #define LCDC_LCWHB      0x10
  72 #define LCWHB_BK_EN     (1<<31)
  73 #define LCWHB_CW(w)     (((w) & 0x1f) << 24)
  74 #define LCWHB_CH(h)     (((h) & 0x1f) << 16)
  75 #define LCWHB_BD(x)     ((x) & 0xff)
  76
  77 #define LCDC_LCHCC      0x14
  78
  79 #ifdef CONFIG_ARCH_MX1
  80 #define LCHCC_CUR_COL_R(r) (((r) & 0x1f) << 11)
  81 #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 5)
  82 #define LCHCC_CUR_COL_B(b) ((b) & 0x1f)
  83 #else
  84 #define LCHCC_CUR_COL_R(r) (((r) & 0x3f) << 12)
  85 #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 6)
  86 #define LCHCC_CUR_COL_B(b) ((b) & 0x3f)
  87 #endif
  88
  89 #define LCDC_PCR        0x18
  90
  91 #define LCDC_HCR        0x1C
  92 #define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
  93 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
  94 #define HCR_H_WAIT_2(x) ((x) & 0xff)
  95
  96 #define LCDC_VCR        0x20
  97 #define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
  98 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
  99 #define VCR_V_WAIT_2(x) ((x) & 0xff)
 100
 101 #define LCDC_POS        0x24
 102 #define POS_POS(x)      ((x) & 1f)
 103
 104 #define LCDC_LSCR1      0x28
 105 /* bit fields in imxfb.h */
 106
 107 #define LCDC_PWMR       0x2C
 108 /* bit fields in imxfb.h */
 109
 110 #define LCDC_DMACR      0x30
 111 /* bit fields in imxfb.h */
 112
 113 #define LCDC_RMCR       0x34
 114
 115 #ifdef CONFIG_ARCH_MX1
 116 #define RMCR_LCDC_EN    (1<<1)
 117 #else
 118 #define RMCR_LCDC_EN    0
 119 #endif
 120
 121 #define RMCR_SELF_REF   (1<<0)
 122
 123 #define LCDC_LCDICR     0x38
 124 #define LCDICR_INT_SYN  (1<<2)
 125 #define LCDICR_INT_CON  (1)
 126
 127 #define LCDC_LCDISR     0x40
 128 #define LCDISR_UDR_ERR  (1<<3)
 129 #define LCDISR_ERR_RES  (1<<2)
 130 #define LCDISR_EOF      (1<<1)
 131 #define LCDISR_BOF      (1<<0)
 132
 133 /* Used fb-mode. Can be set on kernel command line, therefore file-static. */
 134 static const char *fb_mode;
 135
 136
 137 /*
 138  * These are the bitfields for each
 139  * display depth that we support.
 140  */
 141 struct imxfb_rgb {
 142         struct fb_bitfield      red;
 143         struct fb_bitfield      green;
 144         struct fb_bitfield      blue;
 145         struct fb_bitfield      transp;
 146 };
 147
 148 struct imxfb_info {
 149         struct platform_device  *pdev;
 150         void __iomem            *regs;
 151         struct clk              *clk;
 152
 153         /*
 154          * These are the addresses we mapped
 155          * the framebuffer memory region to.
 156          */
 157         dma_addr_t              map_dma;
 158         u_char                  *map_cpu;
 159         u_int                   map_size;
 160
 161         u_char                  *screen_cpu;
 162         dma_addr_t              screen_dma;
 163         u_int                   palette_size;
 164
 165         dma_addr_t              dbar1;
 166         dma_addr_t              dbar2;
 167
 168         u_int                   pcr;
 169         u_int                   pwmr;
 170         u_int                   lscr1;
 171         u_int                   dmacr;
 172         u_int                   cmap_inverse:1,
 173                                 cmap_static:1,
 174                                 unused:30;
 175
 176         struct imx_fb_videomode *mode;
 177         int                     num_modes;
 178         struct backlight_device *bl;
 179
 180         void (*lcd_power)(int);
 181         void (*backlight_power)(int);
 182 };
 183
 184 #define IMX_NAME        "IMX"
 185
 186 /*
 187  * Minimum X and Y resolutions
 188  */
 189 #define MIN_XRES        64
 190 #define MIN_YRES        64
 191
 192 /* Actually this really is 18bit support, the lowest 2 bits of each colour
 193  * are unused in hardware. We claim to have 24bit support to make software
 194  * like X work, which does not support 18bit.
 195  */
 196 static struct imxfb_rgb def_rgb_18 = {
 197         .red    = {.offset = 16, .length = 8,},
 198         .green  = {.offset = 8, .length = 8,},
 199         .blue   = {.offset = 0, .length = 8,},
 200         .transp = {.offset = 0, .length = 0,},
 201 };
 202
 203 static struct imxfb_rgb def_rgb_16_tft = {
 204         .red    = {.offset = 11, .length = 5,},
 205         .green  = {.offset = 5, .length = 6,},
 206         .blue   = {.offset = 0, .length = 5,},
 207         .transp = {.offset = 0, .length = 0,},
 208 };
 209
 210 static struct imxfb_rgb def_rgb_16_stn = {
 211         .red    = {.offset = 8, .length = 4,},
 212         .green  = {.offset = 4, .length = 4,},
 213         .blue   = {.offset = 0, .length = 4,},
 214         .transp = {.offset = 0, .length = 0,},
 215 };
 216
 217 static struct imxfb_rgb def_rgb_8 = {
 218         .red    = {.offset = 0, .length = 8,},
 219         .green  = {.offset = 0, .length = 8,},
 220         .blue   = {.offset = 0, .length = 8,},
 221         .transp = {.offset = 0, .length = 0,},
 222 };
 223
 224 static int imxfb_activate_var(struct fb_var_screeninfo *var,
 225                 struct fb_info *info);
 226
 227 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 228 {
 229         chan &= 0xffff;
 230         chan >>= 16 - bf->length;
 231         return chan << bf->offset;
 232 }
 233
 234 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
 235                 u_int trans, struct fb_info *info)
 236 {
 237         struct imxfb_info *fbi = info->par;
 238         u_int val, ret = 1;
 239
 240 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
 241         if (regno < fbi->palette_size) {
 242                 val = (CNVT_TOHW(red, 4) << 8) |
 243                       (CNVT_TOHW(green,4) << 4) |
 244                       CNVT_TOHW(blue,  4);
 245
 246                 writel(val, fbi->regs + 0x800 + (regno << 2));
 247                 ret = 0;
 248         }
 249         return ret;
 250 }
 251
 252 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 253                    u_int trans, struct fb_info *info)
 254 {
 255         struct imxfb_info *fbi = info->par;
 256         unsigned int val;
 257         int ret = 1;
 258
 259         /*
 260          * If inverse mode was selected, invert all the colours
 261          * rather than the register number.  The register number
 262          * is what you poke into the framebuffer to produce the
 263          * colour you requested.
 264          */
 265         if (fbi->cmap_inverse) {
 266                 red   = 0xffff - red;
 267                 green = 0xffff - green;
 268                 blue  = 0xffff - blue;
 269         }
 270
 271         /*
 272          * If greyscale is true, then we convert the RGB value
 273          * to greyscale no mater what visual we are using.
 274          */
 275         if (info->var.grayscale)
 276                 red = green = blue = (19595 * red + 38470 * green +
 277                                         7471 * blue) >> 16;
 278
 279         switch (info->fix.visual) {
 280         case FB_VISUAL_TRUECOLOR:
 281                 /*
 282                  * 12 or 16-bit True Colour.  We encode the RGB value
 283                  * according to the RGB bitfield information.
 284                  */
 285                 if (regno < 16) {
 286                         u32 *pal = info->pseudo_palette;
 287
 288                         val  = chan_to_field(red, &info->var.red);
 289                         val |= chan_to_field(green, &info->var.green);
 290                         val |= chan_to_field(blue, &info->var.blue);
 291
 292                         pal[regno] = val;
 293                         ret = 0;
 294                 }
 295                 break;
 296
 297         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 298         case FB_VISUAL_PSEUDOCOLOR:
 299                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
 300                 break;
 301         }
 302
 303         return ret;
 304 }
 305
 306 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
 307 {
 308         struct imx_fb_videomode *m;
 309         int i;
 310
 311         for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
 312                 if (!strcmp(m->mode.name, fb_mode))
 313                         return m;
 314         }
 315         return NULL;
 316 }
 317
 318 /*
 319  *  imxfb_check_var():
 320  *    Round up in the following order: bits_per_pixel, xres,
 321  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 322  *    bitfields, horizontal timing, vertical timing.
 323  */
 324 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 325 {
 326         struct imxfb_info *fbi = info->par;
 327         struct imxfb_rgb *rgb;
 328         const struct imx_fb_videomode *imxfb_mode;
 329         unsigned long lcd_clk;
 330         unsigned long long tmp;
 331         u32 pcr = 0;
 332
 333         if (var->xres < MIN_XRES)
 334                 var->xres = MIN_XRES;
 335         if (var->yres < MIN_YRES)
 336                 var->yres = MIN_YRES;
 337
 338         imxfb_mode = imxfb_find_mode(fbi);
 339         if (!imxfb_mode)
 340                 return -EINVAL;
 341
 342         var->xres               = imxfb_mode->mode.xres;
 343         var->yres               = imxfb_mode->mode.yres;
 344         var->bits_per_pixel     = imxfb_mode->bpp;
 345         var->pixclock           = imxfb_mode->mode.pixclock;
 346         var->hsync_len          = imxfb_mode->mode.hsync_len;
 347         var->left_margin        = imxfb_mode->mode.left_margin;
 348         var->right_margin       = imxfb_mode->mode.right_margin;
 349         var->vsync_len          = imxfb_mode->mode.vsync_len;
 350         var->upper_margin       = imxfb_mode->mode.upper_margin;
 351         var->lower_margin       = imxfb_mode->mode.lower_margin;
 352         var->sync               = imxfb_mode->mode.sync;
 353         var->xres_virtual       = max(var->xres_virtual, var->xres);
 354         var->yres_virtual       = max(var->yres_virtual, var->yres);
 355
 356         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
 357
 358         lcd_clk = clk_get_rate(fbi->clk);
 359
 360         tmp = var->pixclock * (unsigned long long)lcd_clk;
 361
 362         do_div(tmp, 1000000);
 363
 364         if (do_div(tmp, 1000000) > 500000)
 365                 tmp++;
 366
 367         pcr = (unsigned int)tmp;
 368
 369         if (--pcr > 0x3F) {
 370                 pcr = 0x3F;
 371                 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
 372                                 lcd_clk / pcr);
 373         }
 374
 375         switch (var->bits_per_pixel) {
 376         case 32:
 377                 pcr |= PCR_BPIX_18;
 378                 rgb = &def_rgb_18;
 379                 break;
 380         case 16:
 381         default:
 382                 if (cpu_is_mx1())
 383                         pcr |= PCR_BPIX_12;
 384                 else
 385                         pcr |= PCR_BPIX_16;
 386
 387                 if (imxfb_mode->pcr & PCR_TFT)
 388                         rgb = &def_rgb_16_tft;
 389                 else
 390                         rgb = &def_rgb_16_stn;
 391                 break;
 392         case 8:
 393                 pcr |= PCR_BPIX_8;
 394                 rgb = &def_rgb_8;
 395                 break;
 396         }
 397
 398         /* add sync polarities */
 399         pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
 400
 401         fbi->pcr = pcr;
 402
 403         /*
 404          * Copy the RGB parameters for this display
 405          * from the machine specific parameters.
 406          */
 407         var->red    = rgb->red;
 408         var->green  = rgb->green;
 409         var->blue   = rgb->blue;
 410         var->transp = rgb->transp;
 411
 412         pr_debug("RGBT length = %d:%d:%d:%d\n",
 413                 var->red.length, var->green.length, var->blue.length,
 414                 var->transp.length);
 415
 416         pr_debug("RGBT offset = %d:%d:%d:%d\n",
 417                 var->red.offset, var->green.offset, var->blue.offset,
 418                 var->transp.offset);
 419
 420         return 0;
 421 }
 422
 423 /*
 424  * imxfb_set_par():
 425  *      Set the user defined part of the display for the specified console
 426  */
 427 static int imxfb_set_par(struct fb_info *info)
 428 {
 429         struct imxfb_info *fbi = info->par;
 430         struct fb_var_screeninfo *var = &info->var;
 431
 432         if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
 433                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 434         else if (!fbi->cmap_static)
 435                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 436         else {
 437                 /*
 438                  * Some people have weird ideas about wanting static
 439                  * pseudocolor maps.  I suspect their user space
 440                  * applications are broken.
 441                  */
 442                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 443         }
 444
 445         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
 446         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 447
 448         imxfb_activate_var(var, info);
 449
 450         return 0;
 451 }
 452
 453
 454
 455 static int imxfb_bl_get_brightness(struct backlight_device *bl)
 456 {
 457         struct imxfb_info *fbi = bl_get_data(bl);
 458
 459         return readl(fbi->regs + LCDC_PWMR) & 0xFF;
 460 }
 461
 462 static int imxfb_bl_update_status(struct backlight_device *bl)
 463 {
 464         struct imxfb_info *fbi = bl_get_data(bl);
 465         int brightness = bl->props.brightness;
 466
 467         if (bl->props.power != FB_BLANK_UNBLANK)
 468                 brightness = 0;
 469         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 470                 brightness = 0;
 471
 472         fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
 473
 474         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 475                 clk_enable(fbi->clk);
 476         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 477         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 478                 clk_disable(fbi->clk);
 479
 480         return 0;
 481 }
 482
 483 static const struct backlight_ops imxfb_lcdc_bl_ops = {
 484         .update_status = imxfb_bl_update_status,
 485         .get_brightness = imxfb_bl_get_brightness,
 486 };
 487
 488 static void imxfb_init_backlight(struct imxfb_info *fbi)
 489 {
 490         struct backlight_properties props;
 491         struct backlight_device *bl;
 492
 493         if (fbi->bl)
 494                 return;
 495
 496         memset(&props, 0, sizeof(struct backlight_properties));
 497         props.max_brightness = 0xff;
 498         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 499
 500         bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
 501                                        &imxfb_lcdc_bl_ops, &props);
 502         if (IS_ERR(bl)) {
 503                 dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
 504                                 PTR_ERR(bl));
 505                 return;
 506         }
 507
 508         fbi->bl = bl;
 509         bl->props.power = FB_BLANK_UNBLANK;
 510         bl->props.fb_blank = FB_BLANK_UNBLANK;
 511         bl->props.brightness = imxfb_bl_get_brightness(bl);
 512 }
 513
 514 static void imxfb_exit_backlight(struct imxfb_info *fbi)
 515 {
 516         if (fbi->bl)
 517                 backlight_device_unregister(fbi->bl);
 518 }
 519
 520 static void imxfb_enable_controller(struct imxfb_info *fbi)
 521 {
 522         pr_debug("Enabling LCD controller\n");
 523
 524         writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
 525
 526         /* panning offset 0 (0 pixel offset)        */
 527         writel(0x00000000, fbi->regs + LCDC_POS);
 528
 529         /* disable hardware cursor */
 530         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
 531                 fbi->regs + LCDC_CPOS);
 532
 533         writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR);
 534
 535         clk_enable(fbi->clk);
 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(fbi->clk);
 553
 554         writel(0, fbi->regs + LCDC_RMCR);
 555 }
 556
 557 static int imxfb_blank(int blank, struct fb_info *info)
 558 {
 559         struct imxfb_info *fbi = info->par;
 560
 561         pr_debug("imxfb_blank: blank=%d\n", blank);
 562
 563         switch (blank) {
 564         case FB_BLANK_POWERDOWN:
 565         case FB_BLANK_VSYNC_SUSPEND:
 566         case FB_BLANK_HSYNC_SUSPEND:
 567         case FB_BLANK_NORMAL:
 568                 imxfb_disable_controller(fbi);
 569                 break;
 570
 571         case FB_BLANK_UNBLANK:
 572                 imxfb_enable_controller(fbi);
 573                 break;
 574         }
 575         return 0;
 576 }
 577
 578 static struct fb_ops imxfb_ops = {
 579         .owner          = THIS_MODULE,
 580         .fb_check_var   = imxfb_check_var,
 581         .fb_set_par     = imxfb_set_par,
 582         .fb_setcolreg   = imxfb_setcolreg,
 583         .fb_fillrect    = cfb_fillrect,
 584         .fb_copyarea    = cfb_copyarea,
 585         .fb_imageblit   = cfb_imageblit,
 586         .fb_blank       = imxfb_blank,
 587 };
 588
 589 /*
 590  * imxfb_activate_var():
 591  *      Configures LCD Controller based on entries in var parameter.  Settings are
 592  *      only written to the controller if changes were made.
 593  */
 594 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
 595 {
 596         struct imxfb_info *fbi = info->par;
 597
 598         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 599                 var->xres, var->hsync_len,
 600                 var->left_margin, var->right_margin);
 601         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 602                 var->yres, var->vsync_len,
 603                 var->upper_margin, var->lower_margin);
 604
 605 #if DEBUG_VAR
 606         if (var->xres < 16        || var->xres > 1024)
 607                 printk(KERN_ERR "%s: invalid xres %d\n",
 608                         info->fix.id, var->xres);
 609         if (var->hsync_len < 1    || var->hsync_len > 64)
 610                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 611                         info->fix.id, var->hsync_len);
 612         if (var->left_margin > 255)
 613                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 614                         info->fix.id, var->left_margin);
 615         if (var->right_margin > 255)
 616                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 617                         info->fix.id, var->right_margin);
 618         if (var->yres < 1 || var->yres > 511)
 619                 printk(KERN_ERR "%s: invalid yres %d\n",
 620                         info->fix.id, var->yres);
 621         if (var->vsync_len > 100)
 622                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 623                         info->fix.id, var->vsync_len);
 624         if (var->upper_margin > 63)
 625                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 626                         info->fix.id, var->upper_margin);
 627         if (var->lower_margin > 255)
 628                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 629                         info->fix.id, var->lower_margin);
 630 #endif
 631
 632         /* physical screen start address            */
 633         writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
 634                 fbi->regs + LCDC_VPW);
 635
 636         writel(HCR_H_WIDTH(var->hsync_len - 1) |
 637                 HCR_H_WAIT_1(var->right_margin - 1) |
 638                 HCR_H_WAIT_2(var->left_margin - 3),
 639                 fbi->regs + LCDC_HCR);
 640
 641         writel(VCR_V_WIDTH(var->vsync_len) |
 642                 VCR_V_WAIT_1(var->lower_margin) |
 643                 VCR_V_WAIT_2(var->upper_margin),
 644                 fbi->regs + LCDC_VCR);
 645
 646         writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
 647                         fbi->regs + LCDC_SIZE);
 648
 649         writel(fbi->pcr, fbi->regs + LCDC_PCR);
 650         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
 651         writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
 652
 653         return 0;
 654 }
 655
 656 #ifdef CONFIG_PM
 657 /*
 658  * Power management hooks.  Note that we won't be called from IRQ context,
 659  * unlike the blank functions above, so we may sleep.
 660  */
 661 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
 662 {
 663         struct fb_info *info = platform_get_drvdata(dev);
 664         struct imxfb_info *fbi = info->par;
 665
 666         pr_debug("%s\n", __func__);
 667
 668         imxfb_disable_controller(fbi);
 669         return 0;
 670 }
 671
 672 static int imxfb_resume(struct platform_device *dev)
 673 {
 674         struct fb_info *info = platform_get_drvdata(dev);
 675         struct imxfb_info *fbi = info->par;
 676
 677         pr_debug("%s\n", __func__);
 678
 679         imxfb_enable_controller(fbi);
 680         return 0;
 681 }
 682 #else
 683 #define imxfb_suspend   NULL
 684 #define imxfb_resume    NULL
 685 #endif
 686
 687 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
 688 {
 689         struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
 690         struct fb_info *info = dev_get_drvdata(&pdev->dev);
 691         struct imxfb_info *fbi = info->par;
 692         struct imx_fb_videomode *m;
 693         int i;
 694
 695         pr_debug("%s\n",__func__);
 696
 697         info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
 698         if (!info->pseudo_palette)
 699                 return -ENOMEM;
 700
 701         memset(fbi, 0, sizeof(struct imxfb_info));
 702
 703         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 704
 705         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
 706         info->fix.type_aux              = 0;
 707         info->fix.xpanstep              = 0;
 708         info->fix.ypanstep              = 0;
 709         info->fix.ywrapstep             = 0;
 710         info->fix.accel                 = FB_ACCEL_NONE;
 711
 712         info->var.nonstd                = 0;
 713         info->var.activate              = FB_ACTIVATE_NOW;
 714         info->var.height                = -1;
 715         info->var.width = -1;
 716         info->var.accel_flags           = 0;
 717         info->var.vmode                 = FB_VMODE_NONINTERLACED;
 718
 719         info->fbops                     = &imxfb_ops;
 720         info->flags                     = FBINFO_FLAG_DEFAULT |
 721                                           FBINFO_READS_FAST;
 722         info->var.grayscale             = pdata->cmap_greyscale;
 723         fbi->cmap_inverse               = pdata->cmap_inverse;
 724         fbi->cmap_static                = pdata->cmap_static;
 725         fbi->lscr1                      = pdata->lscr1;
 726         fbi->dmacr                      = pdata->dmacr;
 727         fbi->pwmr                       = pdata->pwmr;
 728         fbi->lcd_power                  = pdata->lcd_power;
 729         fbi->backlight_power            = pdata->backlight_power;
 730
 731         for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
 732                 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
 733                                 m->mode.xres * m->mode.yres * m->bpp / 8);
 734
 735         return 0;
 736 }
 737
 738 static int __init imxfb_probe(struct platform_device *pdev)
 739 {
 740         struct imxfb_info *fbi;
 741         struct fb_info *info;
 742         struct imx_fb_platform_data *pdata;
 743         struct resource *res;
 744         int ret, i;
 745
 746         dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
 747
 748         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 749         if (!res)
 750                 return -ENODEV;
 751
 752         pdata = pdev->dev.platform_data;
 753         if (!pdata) {
 754                 dev_err(&pdev->dev,"No platform_data available\n");
 755                 return -ENOMEM;
 756         }
 757
 758         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
 759         if (!info)
 760                 return -ENOMEM;
 761
 762         fbi = info->par;
 763
 764         if (!fb_mode)
 765                 fb_mode = pdata->mode[0].mode.name;
 766
 767         platform_set_drvdata(pdev, info);
 768
 769         ret = imxfb_init_fbinfo(pdev);
 770         if (ret < 0)
 771                 goto failed_init;
 772
 773         res = request_mem_region(res->start, resource_size(res),
 774                                 DRIVER_NAME);
 775         if (!res) {
 776                 ret = -EBUSY;
 777                 goto failed_req;
 778         }
 779
 780         fbi->clk = clk_get(&pdev->dev, NULL);
 781         if (IS_ERR(fbi->clk)) {
 782                 ret = PTR_ERR(fbi->clk);
 783                 dev_err(&pdev->dev, "unable to get clock: %d\n", ret);
 784                 goto failed_getclock;
 785         }
 786
 787         fbi->regs = ioremap(res->start, resource_size(res));
 788         if (fbi->regs == NULL) {
 789                 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
 790                 goto failed_ioremap;
 791         }
 792
 793         if (!pdata->fixed_screen_cpu) {
 794                 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
 795                 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
 796                                 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
 797
 798                 if (!fbi->map_cpu) {
 799                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
 800                         ret = -ENOMEM;
 801                         goto failed_map;
 802                 }
 803
 804                 info->screen_base = fbi->map_cpu;
 805                 fbi->screen_cpu = fbi->map_cpu;
 806                 fbi->screen_dma = fbi->map_dma;
 807                 info->fix.smem_start = fbi->screen_dma;
 808         } else {
 809                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
 810                 fbi->map_cpu = pdata->fixed_screen_cpu;
 811                 fbi->map_dma = pdata->fixed_screen_dma;
 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         }
 817
 818         if (pdata->init) {
 819                 ret = pdata->init(fbi->pdev);
 820                 if (ret)
 821                         goto failed_platform_init;
 822         }
 823
 824         fbi->mode = pdata->mode;
 825         fbi->num_modes = pdata->num_modes;
 826
 827         INIT_LIST_HEAD(&info->modelist);
 828         for (i = 0; i < pdata->num_modes; i++)
 829                 fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
 830
 831         /*
 832          * This makes sure that our colour bitfield
 833          * descriptors are correctly initialised.
 834          */
 835         imxfb_check_var(&info->var, info);
 836
 837         ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
 838         if (ret < 0)
 839                 goto failed_cmap;
 840
 841         imxfb_set_par(info);
 842         ret = register_framebuffer(info);
 843         if (ret < 0) {
 844                 dev_err(&pdev->dev, "failed to register framebuffer\n");
 845                 goto failed_register;
 846         }
 847
 848         imxfb_enable_controller(fbi);
 849         fbi->pdev = pdev;
 850         imxfb_init_backlight(fbi);
 851
 852         return 0;
 853
 854 failed_register:
 855         fb_dealloc_cmap(&info->cmap);
 856 failed_cmap:
 857         if (pdata->exit)
 858                 pdata->exit(fbi->pdev);
 859 failed_platform_init:
 860         if (!pdata->fixed_screen_cpu)
 861                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
 862                         fbi->map_dma);
 863 failed_map:
 864         clk_put(fbi->clk);
 865 failed_getclock:
 866         iounmap(fbi->regs);
 867 failed_ioremap:
 868         release_mem_region(res->start, resource_size(res));
 869 failed_req:
 870         kfree(info->pseudo_palette);
 871 failed_init:
 872         platform_set_drvdata(pdev, NULL);
 873         framebuffer_release(info);
 874         return ret;
 875 }
 876
 877 static int __devexit imxfb_remove(struct platform_device *pdev)
 878 {
 879         struct imx_fb_platform_data *pdata;
 880         struct fb_info *info = platform_get_drvdata(pdev);
 881         struct imxfb_info *fbi = info->par;
 882         struct resource *res;
 883
 884         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 885
 886         imxfb_disable_controller(fbi);
 887
 888         imxfb_exit_backlight(fbi);
 889         unregister_framebuffer(info);
 890
 891         pdata = pdev->dev.platform_data;
 892         if (pdata->exit)
 893                 pdata->exit(fbi->pdev);
 894
 895         fb_dealloc_cmap(&info->cmap);
 896         kfree(info->pseudo_palette);
 897         framebuffer_release(info);
 898
 899         iounmap(fbi->regs);
 900         release_mem_region(res->start, resource_size(res));
 901         clk_disable(fbi->clk);
 902         clk_put(fbi->clk);
 903
 904         platform_set_drvdata(pdev, NULL);
 905
 906         return 0;
 907 }
 908
 909 void  imxfb_shutdown(struct platform_device * dev)
 910 {
 911         struct fb_info *info = platform_get_drvdata(dev);
 912         struct imxfb_info *fbi = info->par;
 913         imxfb_disable_controller(fbi);
 914 }
 915
 916 static struct platform_driver imxfb_driver = {
 917         .suspend        = imxfb_suspend,
 918         .resume         = imxfb_resume,
 919         .remove         = __devexit_p(imxfb_remove),
 920         .shutdown       = imxfb_shutdown,
 921         .driver         = {
 922                 .name   = DRIVER_NAME,
 923         },
 924 };
 925
 926 static int imxfb_setup(void)
 927 {
 928 #ifndef MODULE
 929         char *opt, *options = NULL;
 930
 931         if (fb_get_options("imxfb", &options))
 932                 return -ENODEV;
 933
 934         if (!options || !*options)
 935                 return 0;
 936
 937         while ((opt = strsep(&options, ",")) != NULL) {
 938                 if (!*opt)
 939                         continue;
 940                 else
 941                         fb_mode = opt;
 942         }
 943 #endif
 944         return 0;
 945 }
 946
 947 int __init imxfb_init(void)
 948 {
 949         int ret = imxfb_setup();
 950
 951         if (ret < 0)
 952                 return ret;
 953
 954         return platform_driver_probe(&imxfb_driver, imxfb_probe);
 955 }
 956
 957 static void __exit imxfb_cleanup(void)
 958 {
 959         platform_driver_unregister(&imxfb_driver);
 960 }
 961
 962 module_init(imxfb_init);
 963 module_exit(imxfb_cleanup);
 964
 965 MODULE_DESCRIPTION("Motorola i.MX framebuffer driver");
 966 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 967 MODULE_LICENSE("GPL");