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  *      [email protected]
  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 #include <linux/of.h>
  35 #include <linux/of_device.h>
  36
  37 #include <video/of_display_timing.h>
  38 #include <video/of_videomode.h>
  39 #include <video/videomode.h>
  40
  41 #include <linux/platform_data/video-imxfb.h>
  42
  43 /*
  44  * Complain if VAR is out of range.
  45  */
  46 #define DEBUG_VAR 1
  47
  48 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
  49         (defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE) && \
  50                 defined(CONFIG_FB_IMX_MODULE))
  51 #define PWMR_BACKLIGHT_AVAILABLE
  52 #endif
  53
  54 #define DRIVER_NAME "imx-fb"
  55
  56 #define LCDC_SSA        0x00
  57
  58 #define LCDC_SIZE       0x04
  59 #define SIZE_XMAX(x)    ((((x) >> 4) & 0x3f) << 20)
  60
  61 #define YMAX_MASK_IMX1  0x1ff
  62 #define YMAX_MASK_IMX21 0x3ff
  63
  64 #define LCDC_VPW        0x08
  65 #define VPW_VPW(x)      ((x) & 0x3ff)
  66
  67 #define LCDC_CPOS       0x0C
  68 #define CPOS_CC1        (1<<31)
  69 #define CPOS_CC0        (1<<30)
  70 #define CPOS_OP         (1<<28)
  71 #define CPOS_CXP(x)     (((x) & 3ff) << 16)
  72
  73 #define LCDC_LCWHB      0x10
  74 #define LCWHB_BK_EN     (1<<31)
  75 #define LCWHB_CW(w)     (((w) & 0x1f) << 24)
  76 #define LCWHB_CH(h)     (((h) & 0x1f) << 16)
  77 #define LCWHB_BD(x)     ((x) & 0xff)
  78
  79 #define LCDC_LCHCC      0x14
  80
  81 #define LCDC_PCR        0x18
  82
  83 #define LCDC_HCR        0x1C
  84 #define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
  85 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
  86 #define HCR_H_WAIT_2(x) ((x) & 0xff)
  87
  88 #define LCDC_VCR        0x20
  89 #define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
  90 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
  91 #define VCR_V_WAIT_2(x) ((x) & 0xff)
  92
  93 #define LCDC_POS        0x24
  94 #define POS_POS(x)      ((x) & 1f)
  95
  96 #define LCDC_LSCR1      0x28
  97 /* bit fields in imxfb.h */
  98
  99 #define LCDC_PWMR       0x2C
 100 /* bit fields in imxfb.h */
 101
 102 #define LCDC_DMACR      0x30
 103 /* bit fields in imxfb.h */
 104
 105 #define LCDC_RMCR       0x34
 106
 107 #define RMCR_LCDC_EN_MX1        (1<<1)
 108
 109 #define RMCR_SELF_REF   (1<<0)
 110
 111 #define LCDC_LCDICR     0x38
 112 #define LCDICR_INT_SYN  (1<<2)
 113 #define LCDICR_INT_CON  (1)
 114
 115 #define LCDC_LCDISR     0x40
 116 #define LCDISR_UDR_ERR  (1<<3)
 117 #define LCDISR_ERR_RES  (1<<2)
 118 #define LCDISR_EOF      (1<<1)
 119 #define LCDISR_BOF      (1<<0)
 120
 121 #define IMXFB_LSCR1_DEFAULT 0x00120300
 122
 123 /* Used fb-mode. Can be set on kernel command line, therefore file-static. */
 124 static const char *fb_mode;
 125
 126 /*
 127  * These are the bitfields for each
 128  * display depth that we support.
 129  */
 130 struct imxfb_rgb {
 131         struct fb_bitfield      red;
 132         struct fb_bitfield      green;
 133         struct fb_bitfield      blue;
 134         struct fb_bitfield      transp;
 135 };
 136
 137 enum imxfb_type {
 138         IMX1_FB,
 139         IMX21_FB,
 140 };
 141
 142 struct imxfb_info {
 143         struct platform_device  *pdev;
 144         void __iomem            *regs;
 145         struct clk              *clk_ipg;
 146         struct clk              *clk_ahb;
 147         struct clk              *clk_per;
 148         enum imxfb_type         devtype;
 149         bool                    enabled;
 150
 151         /*
 152          * These are the addresses we mapped
 153          * the framebuffer memory region to.
 154          */
 155         dma_addr_t              map_dma;
 156         u_char                  *map_cpu;
 157         u_int                   map_size;
 158
 159         u_char                  *screen_cpu;
 160         dma_addr_t              screen_dma;
 161         u_int                   palette_size;
 162
 163         dma_addr_t              dbar1;
 164         dma_addr_t              dbar2;
 165
 166         u_int                   pcr;
 167         u_int                   pwmr;
 168         u_int                   lscr1;
 169         u_int                   dmacr;
 170         u_int                   cmap_inverse:1,
 171                                 cmap_static:1,
 172                                 unused:30;
 173
 174         struct imx_fb_videomode *mode;
 175         int                     num_modes;
 176 #ifdef PWMR_BACKLIGHT_AVAILABLE
 177         struct backlight_device *bl;
 178 #endif
 179
 180         void (*lcd_power)(int);
 181         void (*backlight_power)(int);
 182 };
 183
 184 static struct platform_device_id imxfb_devtype[] = {
 185         {
 186                 .name = "imx1-fb",
 187                 .driver_data = IMX1_FB,
 188         }, {
 189                 .name = "imx21-fb",
 190                 .driver_data = IMX21_FB,
 191         }, {
 192                 /* sentinel */
 193         }
 194 };
 195 MODULE_DEVICE_TABLE(platform, imxfb_devtype);
 196
 197 static struct of_device_id imxfb_of_dev_id[] = {
 198         {
 199                 .compatible = "fsl,imx1-fb",
 200                 .data = &imxfb_devtype[IMX1_FB],
 201         }, {
 202                 .compatible = "fsl,imx21-fb",
 203                 .data = &imxfb_devtype[IMX21_FB],
 204         }, {
 205                 /* sentinel */
 206         }
 207 };
 208 MODULE_DEVICE_TABLE(of, imxfb_of_dev_id);
 209
 210 static inline int is_imx1_fb(struct imxfb_info *fbi)
 211 {
 212         return fbi->devtype == IMX1_FB;
 213 }
 214
 215 #define IMX_NAME        "IMX"
 216
 217 /*
 218  * Minimum X and Y resolutions
 219  */
 220 #define MIN_XRES        64
 221 #define MIN_YRES        64
 222
 223 /* Actually this really is 18bit support, the lowest 2 bits of each colour
 224  * are unused in hardware. We claim to have 24bit support to make software
 225  * like X work, which does not support 18bit.
 226  */
 227 static struct imxfb_rgb def_rgb_18 = {
 228         .red    = {.offset = 16, .length = 8,},
 229         .green  = {.offset = 8, .length = 8,},
 230         .blue   = {.offset = 0, .length = 8,},
 231         .transp = {.offset = 0, .length = 0,},
 232 };
 233
 234 static struct imxfb_rgb def_rgb_16_tft = {
 235         .red    = {.offset = 11, .length = 5,},
 236         .green  = {.offset = 5, .length = 6,},
 237         .blue   = {.offset = 0, .length = 5,},
 238         .transp = {.offset = 0, .length = 0,},
 239 };
 240
 241 static struct imxfb_rgb def_rgb_16_stn = {
 242         .red    = {.offset = 8, .length = 4,},
 243         .green  = {.offset = 4, .length = 4,},
 244         .blue   = {.offset = 0, .length = 4,},
 245         .transp = {.offset = 0, .length = 0,},
 246 };
 247
 248 static struct imxfb_rgb def_rgb_8 = {
 249         .red    = {.offset = 0, .length = 8,},
 250         .green  = {.offset = 0, .length = 8,},
 251         .blue   = {.offset = 0, .length = 8,},
 252         .transp = {.offset = 0, .length = 0,},
 253 };
 254
 255 static int imxfb_activate_var(struct fb_var_screeninfo *var,
 256                 struct fb_info *info);
 257
 258 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 259 {
 260         chan &= 0xffff;
 261         chan >>= 16 - bf->length;
 262         return chan << bf->offset;
 263 }
 264
 265 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
 266                 u_int trans, struct fb_info *info)
 267 {
 268         struct imxfb_info *fbi = info->par;
 269         u_int val, ret = 1;
 270
 271 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
 272         if (regno < fbi->palette_size) {
 273                 val = (CNVT_TOHW(red, 4) << 8) |
 274                       (CNVT_TOHW(green,4) << 4) |
 275                       CNVT_TOHW(blue,  4);
 276
 277                 writel(val, fbi->regs + 0x800 + (regno << 2));
 278                 ret = 0;
 279         }
 280         return ret;
 281 }
 282
 283 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 284                    u_int trans, struct fb_info *info)
 285 {
 286         struct imxfb_info *fbi = info->par;
 287         unsigned int val;
 288         int ret = 1;
 289
 290         /*
 291          * If inverse mode was selected, invert all the colours
 292          * rather than the register number.  The register number
 293          * is what you poke into the framebuffer to produce the
 294          * colour you requested.
 295          */
 296         if (fbi->cmap_inverse) {
 297                 red   = 0xffff - red;
 298                 green = 0xffff - green;
 299                 blue  = 0xffff - blue;
 300         }
 301
 302         /*
 303          * If greyscale is true, then we convert the RGB value
 304          * to greyscale no mater what visual we are using.
 305          */
 306         if (info->var.grayscale)
 307                 red = green = blue = (19595 * red + 38470 * green +
 308                                         7471 * blue) >> 16;
 309
 310         switch (info->fix.visual) {
 311         case FB_VISUAL_TRUECOLOR:
 312                 /*
 313                  * 12 or 16-bit True Colour.  We encode the RGB value
 314                  * according to the RGB bitfield information.
 315                  */
 316                 if (regno < 16) {
 317                         u32 *pal = info->pseudo_palette;
 318
 319                         val  = chan_to_field(red, &info->var.red);
 320                         val |= chan_to_field(green, &info->var.green);
 321                         val |= chan_to_field(blue, &info->var.blue);
 322
 323                         pal[regno] = val;
 324                         ret = 0;
 325                 }
 326                 break;
 327
 328         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 329         case FB_VISUAL_PSEUDOCOLOR:
 330                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
 331                 break;
 332         }
 333
 334         return ret;
 335 }
 336
 337 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
 338 {
 339         struct imx_fb_videomode *m;
 340         int i;
 341
 342         if (!fb_mode)
 343                 return &fbi->mode[0];
 344
 345         for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
 346                 if (!strcmp(m->mode.name, fb_mode))
 347                         return m;
 348         }
 349         return NULL;
 350 }
 351
 352 /*
 353  *  imxfb_check_var():
 354  *    Round up in the following order: bits_per_pixel, xres,
 355  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 356  *    bitfields, horizontal timing, vertical timing.
 357  */
 358 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 359 {
 360         struct imxfb_info *fbi = info->par;
 361         struct imxfb_rgb *rgb;
 362         const struct imx_fb_videomode *imxfb_mode;
 363         unsigned long lcd_clk;
 364         unsigned long long tmp;
 365         u32 pcr = 0;
 366
 367         if (var->xres < MIN_XRES)
 368                 var->xres = MIN_XRES;
 369         if (var->yres < MIN_YRES)
 370                 var->yres = MIN_YRES;
 371
 372         imxfb_mode = imxfb_find_mode(fbi);
 373         if (!imxfb_mode)
 374                 return -EINVAL;
 375
 376         var->xres               = imxfb_mode->mode.xres;
 377         var->yres               = imxfb_mode->mode.yres;
 378         var->bits_per_pixel     = imxfb_mode->bpp;
 379         var->pixclock           = imxfb_mode->mode.pixclock;
 380         var->hsync_len          = imxfb_mode->mode.hsync_len;
 381         var->left_margin        = imxfb_mode->mode.left_margin;
 382         var->right_margin       = imxfb_mode->mode.right_margin;
 383         var->vsync_len          = imxfb_mode->mode.vsync_len;
 384         var->upper_margin       = imxfb_mode->mode.upper_margin;
 385         var->lower_margin       = imxfb_mode->mode.lower_margin;
 386         var->sync               = imxfb_mode->mode.sync;
 387         var->xres_virtual       = max(var->xres_virtual, var->xres);
 388         var->yres_virtual       = max(var->yres_virtual, var->yres);
 389
 390         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
 391
 392         lcd_clk = clk_get_rate(fbi->clk_per);
 393
 394         tmp = var->pixclock * (unsigned long long)lcd_clk;
 395
 396         do_div(tmp, 1000000);
 397
 398         if (do_div(tmp, 1000000) > 500000)
 399                 tmp++;
 400
 401         pcr = (unsigned int)tmp;
 402
 403         if (--pcr > 0x3F) {
 404                 pcr = 0x3F;
 405                 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
 406                                 lcd_clk / pcr);
 407         }
 408
 409         switch (var->bits_per_pixel) {
 410         case 32:
 411                 pcr |= PCR_BPIX_18;
 412                 rgb = &def_rgb_18;
 413                 break;
 414         case 16:
 415         default:
 416                 if (is_imx1_fb(fbi))
 417                         pcr |= PCR_BPIX_12;
 418                 else
 419                         pcr |= PCR_BPIX_16;
 420
 421                 if (imxfb_mode->pcr & PCR_TFT)
 422                         rgb = &def_rgb_16_tft;
 423                 else
 424                         rgb = &def_rgb_16_stn;
 425                 break;
 426         case 8:
 427                 pcr |= PCR_BPIX_8;
 428                 rgb = &def_rgb_8;
 429                 break;
 430         }
 431
 432         /* add sync polarities */
 433         pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
 434
 435         fbi->pcr = pcr;
 436
 437         /*
 438          * Copy the RGB parameters for this display
 439          * from the machine specific parameters.
 440          */
 441         var->red    = rgb->red;
 442         var->green  = rgb->green;
 443         var->blue   = rgb->blue;
 444         var->transp = rgb->transp;
 445
 446         pr_debug("RGBT length = %d:%d:%d:%d\n",
 447                 var->red.length, var->green.length, var->blue.length,
 448                 var->transp.length);
 449
 450         pr_debug("RGBT offset = %d:%d:%d:%d\n",
 451                 var->red.offset, var->green.offset, var->blue.offset,
 452                 var->transp.offset);
 453
 454         return 0;
 455 }
 456
 457 /*
 458  * imxfb_set_par():
 459  *      Set the user defined part of the display for the specified console
 460  */
 461 static int imxfb_set_par(struct fb_info *info)
 462 {
 463         struct imxfb_info *fbi = info->par;
 464         struct fb_var_screeninfo *var = &info->var;
 465
 466         if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
 467                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 468         else if (!fbi->cmap_static)
 469                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 470         else {
 471                 /*
 472                  * Some people have weird ideas about wanting static
 473                  * pseudocolor maps.  I suspect their user space
 474                  * applications are broken.
 475                  */
 476                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 477         }
 478
 479         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
 480         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 481
 482         imxfb_activate_var(var, info);
 483
 484         return 0;
 485 }
 486
 487 #ifdef PWMR_BACKLIGHT_AVAILABLE
 488 static int imxfb_bl_get_brightness(struct backlight_device *bl)
 489 {
 490         struct imxfb_info *fbi = bl_get_data(bl);
 491
 492         return readl(fbi->regs + LCDC_PWMR) & 0xFF;
 493 }
 494
 495 static int imxfb_bl_update_status(struct backlight_device *bl)
 496 {
 497         struct imxfb_info *fbi = bl_get_data(bl);
 498         int brightness = bl->props.brightness;
 499
 500         if (!fbi->pwmr)
 501                 return 0;
 502
 503         if (bl->props.power != FB_BLANK_UNBLANK)
 504                 brightness = 0;
 505         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 506                 brightness = 0;
 507
 508         fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
 509
 510         if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
 511                 clk_prepare_enable(fbi->clk_ipg);
 512                 clk_prepare_enable(fbi->clk_ahb);
 513                 clk_prepare_enable(fbi->clk_per);
 514         }
 515         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 516         if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
 517                 clk_disable_unprepare(fbi->clk_per);
 518                 clk_disable_unprepare(fbi->clk_ahb);
 519                 clk_disable_unprepare(fbi->clk_ipg);
 520         }
 521
 522         return 0;
 523 }
 524
 525 static const struct backlight_ops imxfb_lcdc_bl_ops = {
 526         .update_status = imxfb_bl_update_status,
 527         .get_brightness = imxfb_bl_get_brightness,
 528 };
 529
 530 static void imxfb_init_backlight(struct imxfb_info *fbi)
 531 {
 532         struct backlight_properties props;
 533         struct backlight_device *bl;
 534
 535         if (fbi->bl)
 536                 return;
 537
 538         memset(&props, 0, sizeof(struct backlight_properties));
 539         props.max_brightness = 0xff;
 540         props.type = BACKLIGHT_RAW;
 541         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 542
 543         bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
 544                                        &imxfb_lcdc_bl_ops, &props);
 545         if (IS_ERR(bl)) {
 546                 dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
 547                                 PTR_ERR(bl));
 548                 return;
 549         }
 550
 551         fbi->bl = bl;
 552         bl->props.power = FB_BLANK_UNBLANK;
 553         bl->props.fb_blank = FB_BLANK_UNBLANK;
 554         bl->props.brightness = imxfb_bl_get_brightness(bl);
 555 }
 556
 557 static void imxfb_exit_backlight(struct imxfb_info *fbi)
 558 {
 559         if (fbi->bl)
 560                 backlight_device_unregister(fbi->bl);
 561 }
 562 #endif
 563
 564 static void imxfb_enable_controller(struct imxfb_info *fbi)
 565 {
 566
 567         if (fbi->enabled)
 568                 return;
 569
 570         pr_debug("Enabling LCD controller\n");
 571
 572         writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
 573
 574         /* panning offset 0 (0 pixel offset)        */
 575         writel(0x00000000, fbi->regs + LCDC_POS);
 576
 577         /* disable hardware cursor */
 578         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
 579                 fbi->regs + LCDC_CPOS);
 580
 581         /*
 582          * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
 583          * on other SoCs
 584          */
 585         writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
 586
 587         clk_prepare_enable(fbi->clk_ipg);
 588         clk_prepare_enable(fbi->clk_ahb);
 589         clk_prepare_enable(fbi->clk_per);
 590         fbi->enabled = true;
 591
 592         if (fbi->backlight_power)
 593                 fbi->backlight_power(1);
 594         if (fbi->lcd_power)
 595                 fbi->lcd_power(1);
 596 }
 597
 598 static void imxfb_disable_controller(struct imxfb_info *fbi)
 599 {
 600         if (!fbi->enabled)
 601                 return;
 602
 603         pr_debug("Disabling LCD controller\n");
 604
 605         if (fbi->backlight_power)
 606                 fbi->backlight_power(0);
 607         if (fbi->lcd_power)
 608                 fbi->lcd_power(0);
 609
 610         clk_disable_unprepare(fbi->clk_per);
 611         clk_disable_unprepare(fbi->clk_ipg);
 612         clk_disable_unprepare(fbi->clk_ahb);
 613         fbi->enabled = false;
 614
 615         writel(0, fbi->regs + LCDC_RMCR);
 616 }
 617
 618 static int imxfb_blank(int blank, struct fb_info *info)
 619 {
 620         struct imxfb_info *fbi = info->par;
 621
 622         pr_debug("imxfb_blank: blank=%d\n", blank);
 623
 624         switch (blank) {
 625         case FB_BLANK_POWERDOWN:
 626         case FB_BLANK_VSYNC_SUSPEND:
 627         case FB_BLANK_HSYNC_SUSPEND:
 628         case FB_BLANK_NORMAL:
 629                 imxfb_disable_controller(fbi);
 630                 break;
 631
 632         case FB_BLANK_UNBLANK:
 633                 imxfb_enable_controller(fbi);
 634                 break;
 635         }
 636         return 0;
 637 }
 638
 639 static struct fb_ops imxfb_ops = {
 640         .owner          = THIS_MODULE,
 641         .fb_check_var   = imxfb_check_var,
 642         .fb_set_par     = imxfb_set_par,
 643         .fb_setcolreg   = imxfb_setcolreg,
 644         .fb_fillrect    = cfb_fillrect,
 645         .fb_copyarea    = cfb_copyarea,
 646         .fb_imageblit   = cfb_imageblit,
 647         .fb_blank       = imxfb_blank,
 648 };
 649
 650 /*
 651  * imxfb_activate_var():
 652  *      Configures LCD Controller based on entries in var parameter.  Settings are
 653  *      only written to the controller if changes were made.
 654  */
 655 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
 656 {
 657         struct imxfb_info *fbi = info->par;
 658         u32 ymax_mask = is_imx1_fb(fbi) ? YMAX_MASK_IMX1 : YMAX_MASK_IMX21;
 659
 660         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 661                 var->xres, var->hsync_len,
 662                 var->left_margin, var->right_margin);
 663         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 664                 var->yres, var->vsync_len,
 665                 var->upper_margin, var->lower_margin);
 666
 667 #if DEBUG_VAR
 668         if (var->xres < 16        || var->xres > 1024)
 669                 printk(KERN_ERR "%s: invalid xres %d\n",
 670                         info->fix.id, var->xres);
 671         if (var->hsync_len < 1    || var->hsync_len > 64)
 672                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 673                         info->fix.id, var->hsync_len);
 674         if (var->left_margin > 255)
 675                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 676                         info->fix.id, var->left_margin);
 677         if (var->right_margin > 255)
 678                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 679                         info->fix.id, var->right_margin);
 680         if (var->yres < 1 || var->yres > ymax_mask)
 681                 printk(KERN_ERR "%s: invalid yres %d\n",
 682                         info->fix.id, var->yres);
 683         if (var->vsync_len > 100)
 684                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 685                         info->fix.id, var->vsync_len);
 686         if (var->upper_margin > 63)
 687                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 688                         info->fix.id, var->upper_margin);
 689         if (var->lower_margin > 255)
 690                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 691                         info->fix.id, var->lower_margin);
 692 #endif
 693
 694         /* physical screen start address            */
 695         writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
 696                 fbi->regs + LCDC_VPW);
 697
 698         writel(HCR_H_WIDTH(var->hsync_len - 1) |
 699                 HCR_H_WAIT_1(var->right_margin - 1) |
 700                 HCR_H_WAIT_2(var->left_margin - 3),
 701                 fbi->regs + LCDC_HCR);
 702
 703         writel(VCR_V_WIDTH(var->vsync_len) |
 704                 VCR_V_WAIT_1(var->lower_margin) |
 705                 VCR_V_WAIT_2(var->upper_margin),
 706                 fbi->regs + LCDC_VCR);
 707
 708         writel(SIZE_XMAX(var->xres) | (var->yres & ymax_mask),
 709                         fbi->regs + LCDC_SIZE);
 710
 711         writel(fbi->pcr, fbi->regs + LCDC_PCR);
 712 #ifndef PWMR_BACKLIGHT_AVAILABLE
 713         if (fbi->pwmr)
 714                 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 715 #endif
 716         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
 717
 718         /* dmacr = 0 is no valid value, as we need DMA control marks. */
 719         if (fbi->dmacr)
 720                 writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
 721
 722         return 0;
 723 }
 724
 725 #ifdef CONFIG_PM
 726 /*
 727  * Power management hooks.  Note that we won't be called from IRQ context,
 728  * unlike the blank functions above, so we may sleep.
 729  */
 730 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
 731 {
 732         struct fb_info *info = platform_get_drvdata(dev);
 733         struct imxfb_info *fbi = info->par;
 734
 735         pr_debug("%s\n", __func__);
 736
 737         imxfb_disable_controller(fbi);
 738         return 0;
 739 }
 740
 741 static int imxfb_resume(struct platform_device *dev)
 742 {
 743         struct fb_info *info = platform_get_drvdata(dev);
 744         struct imxfb_info *fbi = info->par;
 745
 746         pr_debug("%s\n", __func__);
 747
 748         imxfb_enable_controller(fbi);
 749         return 0;
 750 }
 751 #else
 752 #define imxfb_suspend   NULL
 753 #define imxfb_resume    NULL
 754 #endif
 755
 756 static int imxfb_init_fbinfo(struct platform_device *pdev)
 757 {
 758         struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
 759         struct fb_info *info = dev_get_drvdata(&pdev->dev);
 760         struct imxfb_info *fbi = info->par;
 761         struct device_node *np;
 762
 763         pr_debug("%s\n",__func__);
 764
 765         info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
 766         if (!info->pseudo_palette)
 767                 return -ENOMEM;
 768
 769         memset(fbi, 0, sizeof(struct imxfb_info));
 770
 771         fbi->devtype = pdev->id_entry->driver_data;
 772
 773         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 774
 775         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
 776         info->fix.type_aux              = 0;
 777         info->fix.xpanstep              = 0;
 778         info->fix.ypanstep              = 0;
 779         info->fix.ywrapstep             = 0;
 780         info->fix.accel                 = FB_ACCEL_NONE;
 781
 782         info->var.nonstd                = 0;
 783         info->var.activate              = FB_ACTIVATE_NOW;
 784         info->var.height                = -1;
 785         info->var.width = -1;
 786         info->var.accel_flags           = 0;
 787         info->var.vmode                 = FB_VMODE_NONINTERLACED;
 788
 789         info->fbops                     = &imxfb_ops;
 790         info->flags                     = FBINFO_FLAG_DEFAULT |
 791                                           FBINFO_READS_FAST;
 792         if (pdata) {
 793                 info->var.grayscale             = pdata->cmap_greyscale;
 794                 fbi->cmap_inverse               = pdata->cmap_inverse;
 795                 fbi->cmap_static                = pdata->cmap_static;
 796                 fbi->lscr1                      = pdata->lscr1;
 797                 fbi->dmacr                      = pdata->dmacr;
 798                 fbi->pwmr                       = pdata->pwmr;
 799                 fbi->lcd_power                  = pdata->lcd_power;
 800                 fbi->backlight_power            = pdata->backlight_power;
 801         } else {
 802                 np = pdev->dev.of_node;
 803                 info->var.grayscale = of_property_read_bool(np,
 804                                                 "cmap-greyscale");
 805                 fbi->cmap_inverse = of_property_read_bool(np, "cmap-inverse");
 806                 fbi->cmap_static = of_property_read_bool(np, "cmap-static");
 807
 808                 fbi->lscr1 = IMXFB_LSCR1_DEFAULT;
 809                 of_property_read_u32(np, "fsl,lscr1", &fbi->lscr1);
 810
 811                 of_property_read_u32(np, "fsl,dmacr", &fbi->dmacr);
 812
 813                 /* These two function pointers could be used by some specific
 814                  * platforms. */
 815                 fbi->lcd_power = NULL;
 816                 fbi->backlight_power = NULL;
 817         }
 818
 819         return 0;
 820 }
 821
 822 static int imxfb_of_read_mode(struct device *dev, struct device_node *np,
 823                 struct imx_fb_videomode *imxfb_mode)
 824 {
 825         int ret;
 826         struct fb_videomode *of_mode = &imxfb_mode->mode;
 827         u32 bpp;
 828         u32 pcr;
 829
 830         ret = of_property_read_string(np, "model", &of_mode->name);
 831         if (ret)
 832                 of_mode->name = NULL;
 833
 834         ret = of_get_fb_videomode(np, of_mode, OF_USE_NATIVE_MODE);
 835         if (ret) {
 836                 dev_err(dev, "Failed to get videomode from DT\n");
 837                 return ret;
 838         }
 839
 840         ret = of_property_read_u32(np, "bits-per-pixel", &bpp);
 841         ret |= of_property_read_u32(np, "fsl,pcr", &pcr);
 842
 843         if (ret) {
 844                 dev_err(dev, "Failed to read bpp and pcr from DT\n");
 845                 return -EINVAL;
 846         }
 847
 848         if (bpp < 1 || bpp > 255) {
 849                 dev_err(dev, "Bits per pixel have to be between 1 and 255\n");
 850                 return -EINVAL;
 851         }
 852
 853         imxfb_mode->bpp = bpp;
 854         imxfb_mode->pcr = pcr;
 855
 856         return 0;
 857 }
 858
 859 static int imxfb_probe(struct platform_device *pdev)
 860 {
 861         struct imxfb_info *fbi;
 862         struct fb_info *info;
 863         struct imx_fb_platform_data *pdata;
 864         struct resource *res;
 865         struct imx_fb_videomode *m;
 866         const struct of_device_id *of_id;
 867         int ret, i;
 868         int bytes_per_pixel;
 869
 870         dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
 871
 872         of_id = of_match_device(imxfb_of_dev_id, &pdev->dev);
 873         if (of_id)
 874                 pdev->id_entry = of_id->data;
 875
 876         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 877         if (!res)
 878                 return -ENODEV;
 879
 880         pdata = pdev->dev.platform_data;
 881
 882         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
 883         if (!info)
 884                 return -ENOMEM;
 885
 886         fbi = info->par;
 887
 888         platform_set_drvdata(pdev, info);
 889
 890         ret = imxfb_init_fbinfo(pdev);
 891         if (ret < 0)
 892                 goto failed_init;
 893
 894         if (pdata) {
 895                 if (!fb_mode)
 896                         fb_mode = pdata->mode[0].mode.name;
 897
 898                 fbi->mode = pdata->mode;
 899                 fbi->num_modes = pdata->num_modes;
 900         } else {
 901                 struct device_node *display_np;
 902                 fb_mode = NULL;
 903
 904                 display_np = of_parse_phandle(pdev->dev.of_node, "display", 0);
 905                 if (!display_np) {
 906                         dev_err(&pdev->dev, "No display defined in devicetree\n");
 907                         ret = -EINVAL;
 908                         goto failed_of_parse;
 909                 }
 910
 911                 /*
 912                  * imxfb does not support more modes, we choose only the native
 913                  * mode.
 914                  */
 915                 fbi->num_modes = 1;
 916
 917                 fbi->mode = devm_kzalloc(&pdev->dev,
 918                                 sizeof(struct imx_fb_videomode), GFP_KERNEL);
 919                 if (!fbi->mode) {
 920                         ret = -ENOMEM;
 921                         goto failed_of_parse;
 922                 }
 923
 924                 ret = imxfb_of_read_mode(&pdev->dev, display_np, fbi->mode);
 925                 if (ret)
 926                         goto failed_of_parse;
 927         }
 928
 929         /* Calculate maximum bytes used per pixel. In most cases this should
 930          * be the same as m->bpp/8 */
 931         m = &fbi->mode[0];
 932         bytes_per_pixel = (m->bpp + 7) / 8;
 933         for (i = 0; i < fbi->num_modes; i++, m++)
 934                 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
 935                                 m->mode.xres * m->mode.yres * bytes_per_pixel);
 936
 937         res = request_mem_region(res->start, resource_size(res),
 938                                 DRIVER_NAME);
 939         if (!res) {
 940                 ret = -EBUSY;
 941                 goto failed_req;
 942         }
 943
 944         fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
 945         if (IS_ERR(fbi->clk_ipg)) {
 946                 ret = PTR_ERR(fbi->clk_ipg);
 947                 goto failed_getclock;
 948         }
 949
 950         fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
 951         if (IS_ERR(fbi->clk_ahb)) {
 952                 ret = PTR_ERR(fbi->clk_ahb);
 953                 goto failed_getclock;
 954         }
 955
 956         fbi->clk_per = devm_clk_get(&pdev->dev, "per");
 957         if (IS_ERR(fbi->clk_per)) {
 958                 ret = PTR_ERR(fbi->clk_per);
 959                 goto failed_getclock;
 960         }
 961
 962         fbi->regs = ioremap(res->start, resource_size(res));
 963         if (fbi->regs == NULL) {
 964                 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
 965                 ret = -ENOMEM;
 966                 goto failed_ioremap;
 967         }
 968
 969         /* Seems not being used by anyone, so no support for oftree */
 970         if (!pdata || !pdata->fixed_screen_cpu) {
 971                 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
 972                 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
 973                                 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
 974
 975                 if (!fbi->map_cpu) {
 976                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
 977                         ret = -ENOMEM;
 978                         goto failed_map;
 979                 }
 980
 981                 info->screen_base = fbi->map_cpu;
 982                 fbi->screen_cpu = fbi->map_cpu;
 983                 fbi->screen_dma = fbi->map_dma;
 984                 info->fix.smem_start = fbi->screen_dma;
 985         } else {
 986                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
 987                 fbi->map_cpu = pdata->fixed_screen_cpu;
 988                 fbi->map_dma = pdata->fixed_screen_dma;
 989                 info->screen_base = fbi->map_cpu;
 990                 fbi->screen_cpu = fbi->map_cpu;
 991                 fbi->screen_dma = fbi->map_dma;
 992                 info->fix.smem_start = fbi->screen_dma;
 993         }
 994
 995         if (pdata && pdata->init) {
 996                 ret = pdata->init(fbi->pdev);
 997                 if (ret)
 998                         goto failed_platform_init;
 999         }
1000
1001
1002         INIT_LIST_HEAD(&info->modelist);
1003         for (i = 0; i < fbi->num_modes; i++)
1004                 fb_add_videomode(&fbi->mode[i].mode, &info->modelist);
1005
1006         /*
1007          * This makes sure that our colour bitfield
1008          * descriptors are correctly initialised.
1009          */
1010         imxfb_check_var(&info->var, info);
1011
1012         ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
1013         if (ret < 0)
1014                 goto failed_cmap;
1015
1016         imxfb_set_par(info);
1017         ret = register_framebuffer(info);
1018         if (ret < 0) {
1019                 dev_err(&pdev->dev, "failed to register framebuffer\n");
1020                 goto failed_register;
1021         }
1022
1023         imxfb_enable_controller(fbi);
1024         fbi->pdev = pdev;
1025 #ifdef PWMR_BACKLIGHT_AVAILABLE
1026         imxfb_init_backlight(fbi);
1027 #endif
1028
1029         return 0;
1030
1031 failed_register:
1032         fb_dealloc_cmap(&info->cmap);
1033 failed_cmap:
1034         if (pdata && pdata->exit)
1035                 pdata->exit(fbi->pdev);
1036 failed_platform_init:
1037         if (pdata && !pdata->fixed_screen_cpu)
1038                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
1039                         fbi->map_dma);
1040 failed_map:
1041         iounmap(fbi->regs);
1042 failed_ioremap:
1043 failed_getclock:
1044         release_mem_region(res->start, resource_size(res));
1045 failed_req:
1046 failed_of_parse:
1047         kfree(info->pseudo_palette);
1048 failed_init:
1049         framebuffer_release(info);
1050         return ret;
1051 }
1052
1053 static int imxfb_remove(struct platform_device *pdev)
1054 {
1055         struct imx_fb_platform_data *pdata;
1056         struct fb_info *info = platform_get_drvdata(pdev);
1057         struct imxfb_info *fbi = info->par;
1058         struct resource *res;
1059
1060         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1061
1062         imxfb_disable_controller(fbi);
1063
1064 #ifdef PWMR_BACKLIGHT_AVAILABLE
1065         imxfb_exit_backlight(fbi);
1066 #endif
1067         unregister_framebuffer(info);
1068
1069         pdata = pdev->dev.platform_data;
1070         if (pdata && pdata->exit)
1071                 pdata->exit(fbi->pdev);
1072
1073         fb_dealloc_cmap(&info->cmap);
1074         kfree(info->pseudo_palette);
1075         framebuffer_release(info);
1076
1077         iounmap(fbi->regs);
1078         release_mem_region(res->start, resource_size(res));
1079
1080         return 0;
1081 }
1082
1083 static void imxfb_shutdown(struct platform_device *dev)
1084 {
1085         struct fb_info *info = platform_get_drvdata(dev);
1086         struct imxfb_info *fbi = info->par;
1087         imxfb_disable_controller(fbi);
1088 }
1089
1090 static struct platform_driver imxfb_driver = {
1091         .suspend        = imxfb_suspend,
1092         .resume         = imxfb_resume,
1093         .remove         = imxfb_remove,
1094         .shutdown       = imxfb_shutdown,
1095         .driver         = {
1096                 .name   = DRIVER_NAME,
1097                 .of_match_table = imxfb_of_dev_id,
1098         },
1099         .id_table       = imxfb_devtype,
1100 };
1101
1102 static int imxfb_setup(void)
1103 {
1104 #ifndef MODULE
1105         char *opt, *options = NULL;
1106
1107         if (fb_get_options("imxfb", &options))
1108                 return -ENODEV;
1109
1110         if (!options || !*options)
1111                 return 0;
1112
1113         while ((opt = strsep(&options, ",")) != NULL) {
1114                 if (!*opt)
1115                         continue;
1116                 else
1117                         fb_mode = opt;
1118         }
1119 #endif
1120         return 0;
1121 }
1122
1123 static int __init imxfb_init(void)
1124 {
1125         int ret = imxfb_setup();
1126
1127         if (ret < 0)
1128                 return ret;
1129
1130         return platform_driver_probe(&imxfb_driver, imxfb_probe);
1131 }
1132
1133 static void __exit imxfb_cleanup(void)
1134 {
1135         platform_driver_unregister(&imxfb_driver);
1136 }
1137
1138 module_init(imxfb_init);
1139 module_exit(imxfb_cleanup);
1140
1141 MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
1142 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1143 MODULE_LICENSE("GPL");