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 #ifdef CONFIG_ARCH_MX1
  57 #define SIZE_YMAX(y)    ((y) & 0x1ff)
  58 #else
  59 #define SIZE_YMAX(y)    ((y) & 0x3ff)
  60 #endif
  61
  62 #define LCDC_VPW        0x08
  63 #define VPW_VPW(x)      ((x) & 0x3ff)
  64
  65 #define LCDC_CPOS       0x0C
  66 #define CPOS_CC1        (1<<31)
  67 #define CPOS_CC0        (1<<30)
  68 #define CPOS_OP         (1<<28)
  69 #define CPOS_CXP(x)     (((x) & 3ff) << 16)
  70
  71 #ifdef CONFIG_ARCH_MX1
  72 #define CPOS_CYP(y)     ((y) & 0x1ff)
  73 #else
  74 #define CPOS_CYP(y)     ((y) & 0x3ff)
  75 #endif
  76
  77 #define LCDC_LCWHB      0x10
  78 #define LCWHB_BK_EN     (1<<31)
  79 #define LCWHB_CW(w)     (((w) & 0x1f) << 24)
  80 #define LCWHB_CH(h)     (((h) & 0x1f) << 16)
  81 #define LCWHB_BD(x)     ((x) & 0xff)
  82
  83 #define LCDC_LCHCC      0x14
  84
  85 #ifdef CONFIG_ARCH_MX1
  86 #define LCHCC_CUR_COL_R(r) (((r) & 0x1f) << 11)
  87 #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 5)
  88 #define LCHCC_CUR_COL_B(b) ((b) & 0x1f)
  89 #else
  90 #define LCHCC_CUR_COL_R(r) (((r) & 0x3f) << 12)
  91 #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 6)
  92 #define LCHCC_CUR_COL_B(b) ((b) & 0x3f)
  93 #endif
  94
  95 #define LCDC_PCR        0x18
  96
  97 #define LCDC_HCR        0x1C
  98 #define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
  99 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
 100 #define HCR_H_WAIT_2(x) ((x) & 0xff)
 101
 102 #define LCDC_VCR        0x20
 103 #define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
 104 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
 105 #define VCR_V_WAIT_2(x) ((x) & 0xff)
 106
 107 #define LCDC_POS        0x24
 108 #define POS_POS(x)      ((x) & 1f)
 109
 110 #define LCDC_LSCR1      0x28
 111 /* bit fields in imxfb.h */
 112
 113 #define LCDC_PWMR       0x2C
 114 /* bit fields in imxfb.h */
 115
 116 #define LCDC_DMACR      0x30
 117 /* bit fields in imxfb.h */
 118
 119 #define LCDC_RMCR       0x34
 120
 121 #ifdef CONFIG_ARCH_MX1
 122 #define RMCR_LCDC_EN    (1<<1)
 123 #else
 124 #define RMCR_LCDC_EN    0
 125 #endif
 126
 127 #define RMCR_SELF_REF   (1<<0)
 128
 129 #define LCDC_LCDICR     0x38
 130 #define LCDICR_INT_SYN  (1<<2)
 131 #define LCDICR_INT_CON  (1)
 132
 133 #define LCDC_LCDISR     0x40
 134 #define LCDISR_UDR_ERR  (1<<3)
 135 #define LCDISR_ERR_RES  (1<<2)
 136 #define LCDISR_EOF      (1<<1)
 137 #define LCDISR_BOF      (1<<0)
 138
 139 /* Used fb-mode. Can be set on kernel command line, therefore file-static. */
 140 static const char *fb_mode;
 141
 142
 143 /*
 144  * These are the bitfields for each
 145  * display depth that we support.
 146  */
 147 struct imxfb_rgb {
 148         struct fb_bitfield      red;
 149         struct fb_bitfield      green;
 150         struct fb_bitfield      blue;
 151         struct fb_bitfield      transp;
 152 };
 153
 154 struct imxfb_info {
 155         struct platform_device  *pdev;
 156         void __iomem            *regs;
 157         struct clk              *clk;
 158
 159         /*
 160          * These are the addresses we mapped
 161          * the framebuffer memory region to.
 162          */
 163         dma_addr_t              map_dma;
 164         u_char                  *map_cpu;
 165         u_int                   map_size;
 166
 167         u_char                  *screen_cpu;
 168         dma_addr_t              screen_dma;
 169         u_int                   palette_size;
 170
 171         dma_addr_t              dbar1;
 172         dma_addr_t              dbar2;
 173
 174         u_int                   pcr;
 175         u_int                   pwmr;
 176         u_int                   lscr1;
 177         u_int                   dmacr;
 178         u_int                   cmap_inverse:1,
 179                                 cmap_static:1,
 180                                 unused:30;
 181
 182         struct imx_fb_videomode *mode;
 183         int                     num_modes;
 184 #ifdef PWMR_BACKLIGHT_AVAILABLE
 185         struct backlight_device *bl;
 186 #endif
 187
 188         void (*lcd_power)(int);
 189         void (*backlight_power)(int);
 190 };
 191
 192 #define IMX_NAME        "IMX"
 193
 194 /*
 195  * Minimum X and Y resolutions
 196  */
 197 #define MIN_XRES        64
 198 #define MIN_YRES        64
 199
 200 /* Actually this really is 18bit support, the lowest 2 bits of each colour
 201  * are unused in hardware. We claim to have 24bit support to make software
 202  * like X work, which does not support 18bit.
 203  */
 204 static struct imxfb_rgb def_rgb_18 = {
 205         .red    = {.offset = 16, .length = 8,},
 206         .green  = {.offset = 8, .length = 8,},
 207         .blue   = {.offset = 0, .length = 8,},
 208         .transp = {.offset = 0, .length = 0,},
 209 };
 210
 211 static struct imxfb_rgb def_rgb_16_tft = {
 212         .red    = {.offset = 11, .length = 5,},
 213         .green  = {.offset = 5, .length = 6,},
 214         .blue   = {.offset = 0, .length = 5,},
 215         .transp = {.offset = 0, .length = 0,},
 216 };
 217
 218 static struct imxfb_rgb def_rgb_16_stn = {
 219         .red    = {.offset = 8, .length = 4,},
 220         .green  = {.offset = 4, .length = 4,},
 221         .blue   = {.offset = 0, .length = 4,},
 222         .transp = {.offset = 0, .length = 0,},
 223 };
 224
 225 static struct imxfb_rgb def_rgb_8 = {
 226         .red    = {.offset = 0, .length = 8,},
 227         .green  = {.offset = 0, .length = 8,},
 228         .blue   = {.offset = 0, .length = 8,},
 229         .transp = {.offset = 0, .length = 0,},
 230 };
 231
 232 static int imxfb_activate_var(struct fb_var_screeninfo *var,
 233                 struct fb_info *info);
 234
 235 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 236 {
 237         chan &= 0xffff;
 238         chan >>= 16 - bf->length;
 239         return chan << bf->offset;
 240 }
 241
 242 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
 243                 u_int trans, struct fb_info *info)
 244 {
 245         struct imxfb_info *fbi = info->par;
 246         u_int val, ret = 1;
 247
 248 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
 249         if (regno < fbi->palette_size) {
 250                 val = (CNVT_TOHW(red, 4) << 8) |
 251                       (CNVT_TOHW(green,4) << 4) |
 252                       CNVT_TOHW(blue,  4);
 253
 254                 writel(val, fbi->regs + 0x800 + (regno << 2));
 255                 ret = 0;
 256         }
 257         return ret;
 258 }
 259
 260 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 261                    u_int trans, struct fb_info *info)
 262 {
 263         struct imxfb_info *fbi = info->par;
 264         unsigned int val;
 265         int ret = 1;
 266
 267         /*
 268          * If inverse mode was selected, invert all the colours
 269          * rather than the register number.  The register number
 270          * is what you poke into the framebuffer to produce the
 271          * colour you requested.
 272          */
 273         if (fbi->cmap_inverse) {
 274                 red   = 0xffff - red;
 275                 green = 0xffff - green;
 276                 blue  = 0xffff - blue;
 277         }
 278
 279         /*
 280          * If greyscale is true, then we convert the RGB value
 281          * to greyscale no mater what visual we are using.
 282          */
 283         if (info->var.grayscale)
 284                 red = green = blue = (19595 * red + 38470 * green +
 285                                         7471 * blue) >> 16;
 286
 287         switch (info->fix.visual) {
 288         case FB_VISUAL_TRUECOLOR:
 289                 /*
 290                  * 12 or 16-bit True Colour.  We encode the RGB value
 291                  * according to the RGB bitfield information.
 292                  */
 293                 if (regno < 16) {
 294                         u32 *pal = info->pseudo_palette;
 295
 296                         val  = chan_to_field(red, &info->var.red);
 297                         val |= chan_to_field(green, &info->var.green);
 298                         val |= chan_to_field(blue, &info->var.blue);
 299
 300                         pal[regno] = val;
 301                         ret = 0;
 302                 }
 303                 break;
 304
 305         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 306         case FB_VISUAL_PSEUDOCOLOR:
 307                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
 308                 break;
 309         }
 310
 311         return ret;
 312 }
 313
 314 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
 315 {
 316         struct imx_fb_videomode *m;
 317         int i;
 318
 319         for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
 320                 if (!strcmp(m->mode.name, fb_mode))
 321                         return m;
 322         }
 323         return NULL;
 324 }
 325
 326 /*
 327  *  imxfb_check_var():
 328  *    Round up in the following order: bits_per_pixel, xres,
 329  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 330  *    bitfields, horizontal timing, vertical timing.
 331  */
 332 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 333 {
 334         struct imxfb_info *fbi = info->par;
 335         struct imxfb_rgb *rgb;
 336         const struct imx_fb_videomode *imxfb_mode;
 337         unsigned long lcd_clk;
 338         unsigned long long tmp;
 339         u32 pcr = 0;
 340
 341         if (var->xres < MIN_XRES)
 342                 var->xres = MIN_XRES;
 343         if (var->yres < MIN_YRES)
 344                 var->yres = MIN_YRES;
 345
 346         imxfb_mode = imxfb_find_mode(fbi);
 347         if (!imxfb_mode)
 348                 return -EINVAL;
 349
 350         var->xres               = imxfb_mode->mode.xres;
 351         var->yres               = imxfb_mode->mode.yres;
 352         var->bits_per_pixel     = imxfb_mode->bpp;
 353         var->pixclock           = imxfb_mode->mode.pixclock;
 354         var->hsync_len          = imxfb_mode->mode.hsync_len;
 355         var->left_margin        = imxfb_mode->mode.left_margin;
 356         var->right_margin       = imxfb_mode->mode.right_margin;
 357         var->vsync_len          = imxfb_mode->mode.vsync_len;
 358         var->upper_margin       = imxfb_mode->mode.upper_margin;
 359         var->lower_margin       = imxfb_mode->mode.lower_margin;
 360         var->sync               = imxfb_mode->mode.sync;
 361         var->xres_virtual       = max(var->xres_virtual, var->xres);
 362         var->yres_virtual       = max(var->yres_virtual, var->yres);
 363
 364         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
 365
 366         lcd_clk = clk_get_rate(fbi->clk);
 367
 368         tmp = var->pixclock * (unsigned long long)lcd_clk;
 369
 370         do_div(tmp, 1000000);
 371
 372         if (do_div(tmp, 1000000) > 500000)
 373                 tmp++;
 374
 375         pcr = (unsigned int)tmp;
 376
 377         if (--pcr > 0x3F) {
 378                 pcr = 0x3F;
 379                 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
 380                                 lcd_clk / pcr);
 381         }
 382
 383         switch (var->bits_per_pixel) {
 384         case 32:
 385                 pcr |= PCR_BPIX_18;
 386                 rgb = &def_rgb_18;
 387                 break;
 388         case 16:
 389         default:
 390                 if (cpu_is_mx1())
 391                         pcr |= PCR_BPIX_12;
 392                 else
 393                         pcr |= PCR_BPIX_16;
 394
 395                 if (imxfb_mode->pcr & PCR_TFT)
 396                         rgb = &def_rgb_16_tft;
 397                 else
 398                         rgb = &def_rgb_16_stn;
 399                 break;
 400         case 8:
 401                 pcr |= PCR_BPIX_8;
 402                 rgb = &def_rgb_8;
 403                 break;
 404         }
 405
 406         /* add sync polarities */
 407         pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
 408
 409         fbi->pcr = pcr;
 410
 411         /*
 412          * Copy the RGB parameters for this display
 413          * from the machine specific parameters.
 414          */
 415         var->red    = rgb->red;
 416         var->green  = rgb->green;
 417         var->blue   = rgb->blue;
 418         var->transp = rgb->transp;
 419
 420         pr_debug("RGBT length = %d:%d:%d:%d\n",
 421                 var->red.length, var->green.length, var->blue.length,
 422                 var->transp.length);
 423
 424         pr_debug("RGBT offset = %d:%d:%d:%d\n",
 425                 var->red.offset, var->green.offset, var->blue.offset,
 426                 var->transp.offset);
 427
 428         return 0;
 429 }
 430
 431 /*
 432  * imxfb_set_par():
 433  *      Set the user defined part of the display for the specified console
 434  */
 435 static int imxfb_set_par(struct fb_info *info)
 436 {
 437         struct imxfb_info *fbi = info->par;
 438         struct fb_var_screeninfo *var = &info->var;
 439
 440         if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
 441                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 442         else if (!fbi->cmap_static)
 443                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 444         else {
 445                 /*
 446                  * Some people have weird ideas about wanting static
 447                  * pseudocolor maps.  I suspect their user space
 448                  * applications are broken.
 449                  */
 450                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 451         }
 452
 453         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
 454         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 455
 456         imxfb_activate_var(var, info);
 457
 458         return 0;
 459 }
 460
 461 #ifdef PWMR_BACKLIGHT_AVAILABLE
 462 static int imxfb_bl_get_brightness(struct backlight_device *bl)
 463 {
 464         struct imxfb_info *fbi = bl_get_data(bl);
 465
 466         return readl(fbi->regs + LCDC_PWMR) & 0xFF;
 467 }
 468
 469 static int imxfb_bl_update_status(struct backlight_device *bl)
 470 {
 471         struct imxfb_info *fbi = bl_get_data(bl);
 472         int brightness = bl->props.brightness;
 473
 474         if (bl->props.power != FB_BLANK_UNBLANK)
 475                 brightness = 0;
 476         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 477                 brightness = 0;
 478
 479         fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
 480
 481         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 482                 clk_enable(fbi->clk);
 483         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 484         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 485                 clk_disable(fbi->clk);
 486
 487         return 0;
 488 }
 489
 490 static const struct backlight_ops imxfb_lcdc_bl_ops = {
 491         .update_status = imxfb_bl_update_status,
 492         .get_brightness = imxfb_bl_get_brightness,
 493 };
 494
 495 static void imxfb_init_backlight(struct imxfb_info *fbi)
 496 {
 497         struct backlight_properties props;
 498         struct backlight_device *bl;
 499
 500         if (fbi->bl)
 501                 return;
 502
 503         memset(&props, 0, sizeof(struct backlight_properties));
 504         props.max_brightness = 0xff;
 505         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 506
 507         bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
 508                                        &imxfb_lcdc_bl_ops, &props);
 509         if (IS_ERR(bl)) {
 510                 dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
 511                                 PTR_ERR(bl));
 512                 return;
 513         }
 514
 515         fbi->bl = bl;
 516         bl->props.power = FB_BLANK_UNBLANK;
 517         bl->props.fb_blank = FB_BLANK_UNBLANK;
 518         bl->props.brightness = imxfb_bl_get_brightness(bl);
 519 }
 520
 521 static void imxfb_exit_backlight(struct imxfb_info *fbi)
 522 {
 523         if (fbi->bl)
 524                 backlight_device_unregister(fbi->bl);
 525 }
 526 #endif
 527
 528 static void imxfb_enable_controller(struct imxfb_info *fbi)
 529 {
 530         pr_debug("Enabling LCD controller\n");
 531
 532         writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
 533
 534         /* panning offset 0 (0 pixel offset)        */
 535         writel(0x00000000, fbi->regs + LCDC_POS);
 536
 537         /* disable hardware cursor */
 538         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
 539                 fbi->regs + LCDC_CPOS);
 540
 541         writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR);
 542
 543         clk_enable(fbi->clk);
 544
 545         if (fbi->backlight_power)
 546                 fbi->backlight_power(1);
 547         if (fbi->lcd_power)
 548                 fbi->lcd_power(1);
 549 }
 550
 551 static void imxfb_disable_controller(struct imxfb_info *fbi)
 552 {
 553         pr_debug("Disabling LCD controller\n");
 554
 555         if (fbi->backlight_power)
 556                 fbi->backlight_power(0);
 557         if (fbi->lcd_power)
 558                 fbi->lcd_power(0);
 559
 560         clk_disable(fbi->clk);
 561
 562         writel(0, fbi->regs + LCDC_RMCR);
 563 }
 564
 565 static int imxfb_blank(int blank, struct fb_info *info)
 566 {
 567         struct imxfb_info *fbi = info->par;
 568
 569         pr_debug("imxfb_blank: blank=%d\n", blank);
 570
 571         switch (blank) {
 572         case FB_BLANK_POWERDOWN:
 573         case FB_BLANK_VSYNC_SUSPEND:
 574         case FB_BLANK_HSYNC_SUSPEND:
 575         case FB_BLANK_NORMAL:
 576                 imxfb_disable_controller(fbi);
 577                 break;
 578
 579         case FB_BLANK_UNBLANK:
 580                 imxfb_enable_controller(fbi);
 581                 break;
 582         }
 583         return 0;
 584 }
 585
 586 static struct fb_ops imxfb_ops = {
 587         .owner          = THIS_MODULE,
 588         .fb_check_var   = imxfb_check_var,
 589         .fb_set_par     = imxfb_set_par,
 590         .fb_setcolreg   = imxfb_setcolreg,
 591         .fb_fillrect    = cfb_fillrect,
 592         .fb_copyarea    = cfb_copyarea,
 593         .fb_imageblit   = cfb_imageblit,
 594         .fb_blank       = imxfb_blank,
 595 };
 596
 597 /*
 598  * imxfb_activate_var():
 599  *      Configures LCD Controller based on entries in var parameter.  Settings are
 600  *      only written to the controller if changes were made.
 601  */
 602 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
 603 {
 604         struct imxfb_info *fbi = info->par;
 605
 606         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 607                 var->xres, var->hsync_len,
 608                 var->left_margin, var->right_margin);
 609         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 610                 var->yres, var->vsync_len,
 611                 var->upper_margin, var->lower_margin);
 612
 613 #if DEBUG_VAR
 614         if (var->xres < 16        || var->xres > 1024)
 615                 printk(KERN_ERR "%s: invalid xres %d\n",
 616                         info->fix.id, var->xres);
 617         if (var->hsync_len < 1    || var->hsync_len > 64)
 618                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 619                         info->fix.id, var->hsync_len);
 620         if (var->left_margin > 255)
 621                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 622                         info->fix.id, var->left_margin);
 623         if (var->right_margin > 255)
 624                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 625                         info->fix.id, var->right_margin);
 626         if (var->yres < 1 || var->yres > 511)
 627                 printk(KERN_ERR "%s: invalid yres %d\n",
 628                         info->fix.id, var->yres);
 629         if (var->vsync_len > 100)
 630                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 631                         info->fix.id, var->vsync_len);
 632         if (var->upper_margin > 63)
 633                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 634                         info->fix.id, var->upper_margin);
 635         if (var->lower_margin > 255)
 636                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 637                         info->fix.id, var->lower_margin);
 638 #endif
 639
 640         /* physical screen start address            */
 641         writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
 642                 fbi->regs + LCDC_VPW);
 643
 644         writel(HCR_H_WIDTH(var->hsync_len - 1) |
 645                 HCR_H_WAIT_1(var->right_margin - 1) |
 646                 HCR_H_WAIT_2(var->left_margin - 3),
 647                 fbi->regs + LCDC_HCR);
 648
 649         writel(VCR_V_WIDTH(var->vsync_len) |
 650                 VCR_V_WAIT_1(var->lower_margin) |
 651                 VCR_V_WAIT_2(var->upper_margin),
 652                 fbi->regs + LCDC_VCR);
 653
 654         writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
 655                         fbi->regs + LCDC_SIZE);
 656
 657         writel(fbi->pcr, fbi->regs + LCDC_PCR);
 658 #ifndef PWMR_BACKLIGHT_AVAILABLE
 659         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 660 #endif
 661         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
 662         writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
 663
 664         return 0;
 665 }
 666
 667 #ifdef CONFIG_PM
 668 /*
 669  * Power management hooks.  Note that we won't be called from IRQ context,
 670  * unlike the blank functions above, so we may sleep.
 671  */
 672 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
 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_disable_controller(fbi);
 680         return 0;
 681 }
 682
 683 static int imxfb_resume(struct platform_device *dev)
 684 {
 685         struct fb_info *info = platform_get_drvdata(dev);
 686         struct imxfb_info *fbi = info->par;
 687
 688         pr_debug("%s\n", __func__);
 689
 690         imxfb_enable_controller(fbi);
 691         return 0;
 692 }
 693 #else
 694 #define imxfb_suspend   NULL
 695 #define imxfb_resume    NULL
 696 #endif
 697
 698 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
 699 {
 700         struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
 701         struct fb_info *info = dev_get_drvdata(&pdev->dev);
 702         struct imxfb_info *fbi = info->par;
 703         struct imx_fb_videomode *m;
 704         int i;
 705
 706         pr_debug("%s\n",__func__);
 707
 708         info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
 709         if (!info->pseudo_palette)
 710                 return -ENOMEM;
 711
 712         memset(fbi, 0, sizeof(struct imxfb_info));
 713
 714         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 715
 716         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
 717         info->fix.type_aux              = 0;
 718         info->fix.xpanstep              = 0;
 719         info->fix.ypanstep              = 0;
 720         info->fix.ywrapstep             = 0;
 721         info->fix.accel                 = FB_ACCEL_NONE;
 722
 723         info->var.nonstd                = 0;
 724         info->var.activate              = FB_ACTIVATE_NOW;
 725         info->var.height                = -1;
 726         info->var.width = -1;
 727         info->var.accel_flags           = 0;
 728         info->var.vmode                 = FB_VMODE_NONINTERLACED;
 729
 730         info->fbops                     = &imxfb_ops;
 731         info->flags                     = FBINFO_FLAG_DEFAULT |
 732                                           FBINFO_READS_FAST;
 733         info->var.grayscale             = pdata->cmap_greyscale;
 734         fbi->cmap_inverse               = pdata->cmap_inverse;
 735         fbi->cmap_static                = pdata->cmap_static;
 736         fbi->lscr1                      = pdata->lscr1;
 737         fbi->dmacr                      = pdata->dmacr;
 738         fbi->pwmr                       = pdata->pwmr;
 739         fbi->lcd_power                  = pdata->lcd_power;
 740         fbi->backlight_power            = pdata->backlight_power;
 741
 742         for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
 743                 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
 744                                 m->mode.xres * m->mode.yres * m->bpp / 8);
 745
 746         return 0;
 747 }
 748
 749 static int __init imxfb_probe(struct platform_device *pdev)
 750 {
 751         struct imxfb_info *fbi;
 752         struct fb_info *info;
 753         struct imx_fb_platform_data *pdata;
 754         struct resource *res;
 755         int ret, i;
 756
 757         dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
 758
 759         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 760         if (!res)
 761                 return -ENODEV;
 762
 763         pdata = pdev->dev.platform_data;
 764         if (!pdata) {
 765                 dev_err(&pdev->dev,"No platform_data available\n");
 766                 return -ENOMEM;
 767         }
 768
 769         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
 770         if (!info)
 771                 return -ENOMEM;
 772
 773         fbi = info->par;
 774
 775         if (!fb_mode)
 776                 fb_mode = pdata->mode[0].mode.name;
 777
 778         platform_set_drvdata(pdev, info);
 779
 780         ret = imxfb_init_fbinfo(pdev);
 781         if (ret < 0)
 782                 goto failed_init;
 783
 784         res = request_mem_region(res->start, resource_size(res),
 785                                 DRIVER_NAME);
 786         if (!res) {
 787                 ret = -EBUSY;
 788                 goto failed_req;
 789         }
 790
 791         fbi->clk = clk_get(&pdev->dev, NULL);
 792         if (IS_ERR(fbi->clk)) {
 793                 ret = PTR_ERR(fbi->clk);
 794                 dev_err(&pdev->dev, "unable to get clock: %d\n", ret);
 795                 goto failed_getclock;
 796         }
 797
 798         fbi->regs = ioremap(res->start, resource_size(res));
 799         if (fbi->regs == NULL) {
 800                 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
 801                 goto failed_ioremap;
 802         }
 803
 804         if (!pdata->fixed_screen_cpu) {
 805                 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
 806                 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
 807                                 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
 808
 809                 if (!fbi->map_cpu) {
 810                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
 811                         ret = -ENOMEM;
 812                         goto failed_map;
 813                 }
 814
 815                 info->screen_base = fbi->map_cpu;
 816                 fbi->screen_cpu = fbi->map_cpu;
 817                 fbi->screen_dma = fbi->map_dma;
 818                 info->fix.smem_start = fbi->screen_dma;
 819         } else {
 820                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
 821                 fbi->map_cpu = pdata->fixed_screen_cpu;
 822                 fbi->map_dma = pdata->fixed_screen_dma;
 823                 info->screen_base = fbi->map_cpu;
 824                 fbi->screen_cpu = fbi->map_cpu;
 825                 fbi->screen_dma = fbi->map_dma;
 826                 info->fix.smem_start = fbi->screen_dma;
 827         }
 828
 829         if (pdata->init) {
 830                 ret = pdata->init(fbi->pdev);
 831                 if (ret)
 832                         goto failed_platform_init;
 833         }
 834
 835         fbi->mode = pdata->mode;
 836         fbi->num_modes = pdata->num_modes;
 837
 838         INIT_LIST_HEAD(&info->modelist);
 839         for (i = 0; i < pdata->num_modes; i++)
 840                 fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
 841
 842         /*
 843          * This makes sure that our colour bitfield
 844          * descriptors are correctly initialised.
 845          */
 846         imxfb_check_var(&info->var, info);
 847
 848         ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
 849         if (ret < 0)
 850                 goto failed_cmap;
 851
 852         imxfb_set_par(info);
 853         ret = register_framebuffer(info);
 854         if (ret < 0) {
 855                 dev_err(&pdev->dev, "failed to register framebuffer\n");
 856                 goto failed_register;
 857         }
 858
 859         imxfb_enable_controller(fbi);
 860         fbi->pdev = pdev;
 861 #ifdef PWMR_BACKLIGHT_AVAILABLE
 862         imxfb_init_backlight(fbi);
 863 #endif
 864
 865         return 0;
 866
 867 failed_register:
 868         fb_dealloc_cmap(&info->cmap);
 869 failed_cmap:
 870         if (pdata->exit)
 871                 pdata->exit(fbi->pdev);
 872 failed_platform_init:
 873         if (!pdata->fixed_screen_cpu)
 874                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
 875                         fbi->map_dma);
 876 failed_map:
 877         clk_put(fbi->clk);
 878 failed_getclock:
 879         iounmap(fbi->regs);
 880 failed_ioremap:
 881         release_mem_region(res->start, resource_size(res));
 882 failed_req:
 883         kfree(info->pseudo_palette);
 884 failed_init:
 885         platform_set_drvdata(pdev, NULL);
 886         framebuffer_release(info);
 887         return ret;
 888 }
 889
 890 static int __devexit imxfb_remove(struct platform_device *pdev)
 891 {
 892         struct imx_fb_platform_data *pdata;
 893         struct fb_info *info = platform_get_drvdata(pdev);
 894         struct imxfb_info *fbi = info->par;
 895         struct resource *res;
 896
 897         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 898
 899         imxfb_disable_controller(fbi);
 900
 901 #ifdef PWMR_BACKLIGHT_AVAILABLE
 902         imxfb_exit_backlight(fbi);
 903 #endif
 904         unregister_framebuffer(info);
 905
 906         pdata = pdev->dev.platform_data;
 907         if (pdata->exit)
 908                 pdata->exit(fbi->pdev);
 909
 910         fb_dealloc_cmap(&info->cmap);
 911         kfree(info->pseudo_palette);
 912         framebuffer_release(info);
 913
 914         iounmap(fbi->regs);
 915         release_mem_region(res->start, resource_size(res));
 916         clk_disable(fbi->clk);
 917         clk_put(fbi->clk);
 918
 919         platform_set_drvdata(pdev, NULL);
 920
 921         return 0;
 922 }
 923
 924 void  imxfb_shutdown(struct platform_device * dev)
 925 {
 926         struct fb_info *info = platform_get_drvdata(dev);
 927         struct imxfb_info *fbi = info->par;
 928         imxfb_disable_controller(fbi);
 929 }
 930
 931 static struct platform_driver imxfb_driver = {
 932         .suspend        = imxfb_suspend,
 933         .resume         = imxfb_resume,
 934         .remove         = __devexit_p(imxfb_remove),
 935         .shutdown       = imxfb_shutdown,
 936         .driver         = {
 937                 .name   = DRIVER_NAME,
 938         },
 939 };
 940
 941 static int imxfb_setup(void)
 942 {
 943 #ifndef MODULE
 944         char *opt, *options = NULL;
 945
 946         if (fb_get_options("imxfb", &options))
 947                 return -ENODEV;
 948
 949         if (!options || !*options)
 950                 return 0;
 951
 952         while ((opt = strsep(&options, ",")) != NULL) {
 953                 if (!*opt)
 954                         continue;
 955                 else
 956                         fb_mode = opt;
 957         }
 958 #endif
 959         return 0;
 960 }
 961
 962 int __init imxfb_init(void)
 963 {
 964         int ret = imxfb_setup();
 965
 966         if (ret < 0)
 967                 return ret;
 968
 969         return platform_driver_probe(&imxfb_driver, imxfb_probe);
 970 }
 971
 972 static void __exit imxfb_cleanup(void)
 973 {
 974         platform_driver_unregister(&imxfb_driver);
 975 }
 976
 977 module_init(imxfb_init);
 978 module_exit(imxfb_cleanup);
 979
 980 MODULE_DESCRIPTION("Motorola i.MX framebuffer driver");
 981 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 982 MODULE_LICENSE("GPL");