drivers/video/fbdev/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/lcd.h>
  34 #include <linux/math64.h>
  35 #include <linux/of.h>
  36 #include <linux/of_device.h>
  37
  38 #include <linux/regulator/consumer.h>
  39
  40 #include <video/of_display_timing.h>
  41 #include <video/of_videomode.h>
  42 #include <video/videomode.h>
  43
  44 #include <linux/platform_data/video-imxfb.h>
  45
  46 /*
  47  * Complain if VAR is out of range.
  48  */
  49 #define DEBUG_VAR 1
  50
  51 #define DRIVER_NAME "imx-fb"
  52
  53 #define LCDC_SSA        0x00
  54
  55 #define LCDC_SIZE       0x04
  56 #define SIZE_XMAX(x)    ((((x) >> 4) & 0x3f) << 20)
  57
  58 #define YMAX_MASK_IMX1  0x1ff
  59 #define YMAX_MASK_IMX21 0x3ff
  60
  61 #define LCDC_VPW        0x08
  62 #define VPW_VPW(x)      ((x) & 0x3ff)
  63
  64 #define LCDC_CPOS       0x0C
  65 #define CPOS_CC1        (1<<31)
  66 #define CPOS_CC0        (1<<30)
  67 #define CPOS_OP         (1<<28)
  68 #define CPOS_CXP(x)     (((x) & 3ff) << 16)
  69
  70 #define LCDC_LCWHB      0x10
  71 #define LCWHB_BK_EN     (1<<31)
  72 #define LCWHB_CW(w)     (((w) & 0x1f) << 24)
  73 #define LCWHB_CH(h)     (((h) & 0x1f) << 16)
  74 #define LCWHB_BD(x)     ((x) & 0xff)
  75
  76 #define LCDC_LCHCC      0x14
  77
  78 #define LCDC_PCR        0x18
  79
  80 #define LCDC_HCR        0x1C
  81 #define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
  82 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
  83 #define HCR_H_WAIT_2(x) ((x) & 0xff)
  84
  85 #define LCDC_VCR        0x20
  86 #define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
  87 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
  88 #define VCR_V_WAIT_2(x) ((x) & 0xff)
  89
  90 #define LCDC_POS        0x24
  91 #define POS_POS(x)      ((x) & 1f)
  92
  93 #define LCDC_LSCR1      0x28
  94 /* bit fields in imxfb.h */
  95
  96 #define LCDC_PWMR       0x2C
  97 /* bit fields in imxfb.h */
  98
  99 #define LCDC_DMACR      0x30
 100 /* bit fields in imxfb.h */
 101
 102 #define LCDC_RMCR       0x34
 103
 104 #define RMCR_LCDC_EN_MX1        (1<<1)
 105
 106 #define RMCR_SELF_REF   (1<<0)
 107
 108 #define LCDC_LCDICR     0x38
 109 #define LCDICR_INT_SYN  (1<<2)
 110 #define LCDICR_INT_CON  (1)
 111
 112 #define LCDC_LCDISR     0x40
 113 #define LCDISR_UDR_ERR  (1<<3)
 114 #define LCDISR_ERR_RES  (1<<2)
 115 #define LCDISR_EOF      (1<<1)
 116 #define LCDISR_BOF      (1<<0)
 117
 118 #define IMXFB_LSCR1_DEFAULT 0x00120300
 119
 120 #define LCDC_LAUSCR     0x80
 121 #define LAUSCR_AUS_MODE (1<<31)
 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_int                   map_size;
 157
 158         u_int                   palette_size;
 159
 160         dma_addr_t              dbar1;
 161         dma_addr_t              dbar2;
 162
 163         u_int                   pcr;
 164         u_int                   lauscr;
 165         u_int                   pwmr;
 166         u_int                   lscr1;
 167         u_int                   dmacr;
 168         bool                    cmap_inverse;
 169         bool                    cmap_static;
 170
 171         struct imx_fb_videomode *mode;
 172         int                     num_modes;
 173
 174         struct regulator        *lcd_pwr;
 175         int                     lcd_pwr_enabled;
 176 };
 177
 178 static const struct platform_device_id imxfb_devtype[] = {
 179         {
 180                 .name = "imx1-fb",
 181                 .driver_data = IMX1_FB,
 182         }, {
 183                 .name = "imx21-fb",
 184                 .driver_data = IMX21_FB,
 185         }, {
 186                 /* sentinel */
 187         }
 188 };
 189 MODULE_DEVICE_TABLE(platform, imxfb_devtype);
 190
 191 static const struct of_device_id imxfb_of_dev_id[] = {
 192         {
 193                 .compatible = "fsl,imx1-fb",
 194                 .data = &imxfb_devtype[IMX1_FB],
 195         }, {
 196                 .compatible = "fsl,imx21-fb",
 197                 .data = &imxfb_devtype[IMX21_FB],
 198         }, {
 199                 /* sentinel */
 200         }
 201 };
 202 MODULE_DEVICE_TABLE(of, imxfb_of_dev_id);
 203
 204 static inline int is_imx1_fb(struct imxfb_info *fbi)
 205 {
 206         return fbi->devtype == IMX1_FB;
 207 }
 208
 209 #define IMX_NAME        "IMX"
 210
 211 /*
 212  * Minimum X and Y resolutions
 213  */
 214 #define MIN_XRES        64
 215 #define MIN_YRES        64
 216
 217 /* Actually this really is 18bit support, the lowest 2 bits of each colour
 218  * are unused in hardware. We claim to have 24bit support to make software
 219  * like X work, which does not support 18bit.
 220  */
 221 static struct imxfb_rgb def_rgb_18 = {
 222         .red    = {.offset = 16, .length = 8,},
 223         .green  = {.offset = 8, .length = 8,},
 224         .blue   = {.offset = 0, .length = 8,},
 225         .transp = {.offset = 0, .length = 0,},
 226 };
 227
 228 static struct imxfb_rgb def_rgb_16_tft = {
 229         .red    = {.offset = 11, .length = 5,},
 230         .green  = {.offset = 5, .length = 6,},
 231         .blue   = {.offset = 0, .length = 5,},
 232         .transp = {.offset = 0, .length = 0,},
 233 };
 234
 235 static struct imxfb_rgb def_rgb_16_stn = {
 236         .red    = {.offset = 8, .length = 4,},
 237         .green  = {.offset = 4, .length = 4,},
 238         .blue   = {.offset = 0, .length = 4,},
 239         .transp = {.offset = 0, .length = 0,},
 240 };
 241
 242 static struct imxfb_rgb def_rgb_8 = {
 243         .red    = {.offset = 0, .length = 8,},
 244         .green  = {.offset = 0, .length = 8,},
 245         .blue   = {.offset = 0, .length = 8,},
 246         .transp = {.offset = 0, .length = 0,},
 247 };
 248
 249 static int imxfb_activate_var(struct fb_var_screeninfo *var,
 250                 struct fb_info *info);
 251
 252 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 253 {
 254         chan &= 0xffff;
 255         chan >>= 16 - bf->length;
 256         return chan << bf->offset;
 257 }
 258
 259 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
 260                 u_int trans, struct fb_info *info)
 261 {
 262         struct imxfb_info *fbi = info->par;
 263         u_int val, ret = 1;
 264
 265 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
 266         if (regno < fbi->palette_size) {
 267                 val = (CNVT_TOHW(red, 4) << 8) |
 268                       (CNVT_TOHW(green,4) << 4) |
 269                       CNVT_TOHW(blue,  4);
 270
 271                 writel(val, fbi->regs + 0x800 + (regno << 2));
 272                 ret = 0;
 273         }
 274         return ret;
 275 }
 276
 277 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 278                    u_int trans, struct fb_info *info)
 279 {
 280         struct imxfb_info *fbi = info->par;
 281         unsigned int val;
 282         int ret = 1;
 283
 284         /*
 285          * If inverse mode was selected, invert all the colours
 286          * rather than the register number.  The register number
 287          * is what you poke into the framebuffer to produce the
 288          * colour you requested.
 289          */
 290         if (fbi->cmap_inverse) {
 291                 red   = 0xffff - red;
 292                 green = 0xffff - green;
 293                 blue  = 0xffff - blue;
 294         }
 295
 296         /*
 297          * If greyscale is true, then we convert the RGB value
 298          * to greyscale no mater what visual we are using.
 299          */
 300         if (info->var.grayscale)
 301                 red = green = blue = (19595 * red + 38470 * green +
 302                                         7471 * blue) >> 16;
 303
 304         switch (info->fix.visual) {
 305         case FB_VISUAL_TRUECOLOR:
 306                 /*
 307                  * 12 or 16-bit True Colour.  We encode the RGB value
 308                  * according to the RGB bitfield information.
 309                  */
 310                 if (regno < 16) {
 311                         u32 *pal = info->pseudo_palette;
 312
 313                         val  = chan_to_field(red, &info->var.red);
 314                         val |= chan_to_field(green, &info->var.green);
 315                         val |= chan_to_field(blue, &info->var.blue);
 316
 317                         pal[regno] = val;
 318                         ret = 0;
 319                 }
 320                 break;
 321
 322         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 323         case FB_VISUAL_PSEUDOCOLOR:
 324                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
 325                 break;
 326         }
 327
 328         return ret;
 329 }
 330
 331 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
 332 {
 333         struct imx_fb_videomode *m;
 334         int i;
 335
 336         if (!fb_mode)
 337                 return &fbi->mode[0];
 338
 339         for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
 340                 if (!strcmp(m->mode.name, fb_mode))
 341                         return m;
 342         }
 343         return NULL;
 344 }
 345
 346 /*
 347  *  imxfb_check_var():
 348  *    Round up in the following order: bits_per_pixel, xres,
 349  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 350  *    bitfields, horizontal timing, vertical timing.
 351  */
 352 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 353 {
 354         struct imxfb_info *fbi = info->par;
 355         struct imxfb_rgb *rgb;
 356         const struct imx_fb_videomode *imxfb_mode;
 357         unsigned long lcd_clk;
 358         unsigned long long tmp;
 359         u32 pcr = 0;
 360
 361         if (var->xres < MIN_XRES)
 362                 var->xres = MIN_XRES;
 363         if (var->yres < MIN_YRES)
 364                 var->yres = MIN_YRES;
 365
 366         imxfb_mode = imxfb_find_mode(fbi);
 367         if (!imxfb_mode)
 368                 return -EINVAL;
 369
 370         var->xres               = imxfb_mode->mode.xres;
 371         var->yres               = imxfb_mode->mode.yres;
 372         var->bits_per_pixel     = imxfb_mode->bpp;
 373         var->pixclock           = imxfb_mode->mode.pixclock;
 374         var->hsync_len          = imxfb_mode->mode.hsync_len;
 375         var->left_margin        = imxfb_mode->mode.left_margin;
 376         var->right_margin       = imxfb_mode->mode.right_margin;
 377         var->vsync_len          = imxfb_mode->mode.vsync_len;
 378         var->upper_margin       = imxfb_mode->mode.upper_margin;
 379         var->lower_margin       = imxfb_mode->mode.lower_margin;
 380         var->sync               = imxfb_mode->mode.sync;
 381         var->xres_virtual       = max(var->xres_virtual, var->xres);
 382         var->yres_virtual       = max(var->yres_virtual, var->yres);
 383
 384         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
 385
 386         lcd_clk = clk_get_rate(fbi->clk_per);
 387
 388         tmp = var->pixclock * (unsigned long long)lcd_clk;
 389
 390         do_div(tmp, 1000000);
 391
 392         if (do_div(tmp, 1000000) > 500000)
 393                 tmp++;
 394
 395         pcr = (unsigned int)tmp;
 396
 397         if (--pcr > 0x3F) {
 398                 pcr = 0x3F;
 399                 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
 400                                 lcd_clk / pcr);
 401         }
 402
 403         switch (var->bits_per_pixel) {
 404         case 32:
 405                 pcr |= PCR_BPIX_18;
 406                 rgb = &def_rgb_18;
 407                 break;
 408         case 16:
 409         default:
 410                 if (is_imx1_fb(fbi))
 411                         pcr |= PCR_BPIX_12;
 412                 else
 413                         pcr |= PCR_BPIX_16;
 414
 415                 if (imxfb_mode->pcr & PCR_TFT)
 416                         rgb = &def_rgb_16_tft;
 417                 else
 418                         rgb = &def_rgb_16_stn;
 419                 break;
 420         case 8:
 421                 pcr |= PCR_BPIX_8;
 422                 rgb = &def_rgb_8;
 423                 break;
 424         }
 425
 426         /* add sync polarities */
 427         pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
 428
 429         fbi->pcr = pcr;
 430         /*
 431          * The LCDC AUS Mode Control Register does not exist on imx1.
 432          */
 433         if (!is_imx1_fb(fbi) && imxfb_mode->aus_mode)
 434                 fbi->lauscr = LAUSCR_AUS_MODE;
 435
 436         /*
 437          * Copy the RGB parameters for this display
 438          * from the machine specific parameters.
 439          */
 440         var->red    = rgb->red;
 441         var->green  = rgb->green;
 442         var->blue   = rgb->blue;
 443         var->transp = rgb->transp;
 444
 445         pr_debug("RGBT length = %d:%d:%d:%d\n",
 446                 var->red.length, var->green.length, var->blue.length,
 447                 var->transp.length);
 448
 449         pr_debug("RGBT offset = %d:%d:%d:%d\n",
 450                 var->red.offset, var->green.offset, var->blue.offset,
 451                 var->transp.offset);
 452
 453         return 0;
 454 }
 455
 456 /*
 457  * imxfb_set_par():
 458  *      Set the user defined part of the display for the specified console
 459  */
 460 static int imxfb_set_par(struct fb_info *info)
 461 {
 462         struct imxfb_info *fbi = info->par;
 463         struct fb_var_screeninfo *var = &info->var;
 464
 465         if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
 466                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 467         else if (!fbi->cmap_static)
 468                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 469         else {
 470                 /*
 471                  * Some people have weird ideas about wanting static
 472                  * pseudocolor maps.  I suspect their user space
 473                  * applications are broken.
 474                  */
 475                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 476         }
 477
 478         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
 479         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 480
 481         imxfb_activate_var(var, info);
 482
 483         return 0;
 484 }
 485
 486 static int imxfb_enable_controller(struct imxfb_info *fbi)
 487 {
 488         int ret;
 489
 490         if (fbi->enabled)
 491                 return 0;
 492
 493         pr_debug("Enabling LCD controller\n");
 494
 495         writel(fbi->map_dma, fbi->regs + LCDC_SSA);
 496
 497         /* panning offset 0 (0 pixel offset)        */
 498         writel(0x00000000, fbi->regs + LCDC_POS);
 499
 500         /* disable hardware cursor */
 501         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
 502                 fbi->regs + LCDC_CPOS);
 503
 504         /*
 505          * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
 506          * on other SoCs
 507          */
 508         writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
 509
 510         ret = clk_prepare_enable(fbi->clk_ipg);
 511         if (ret)
 512                 goto err_enable_ipg;
 513
 514         ret = clk_prepare_enable(fbi->clk_ahb);
 515         if (ret)
 516                 goto err_enable_ahb;
 517
 518         ret = clk_prepare_enable(fbi->clk_per);
 519         if (ret)
 520                 goto err_enable_per;
 521
 522         fbi->enabled = true;
 523         return 0;
 524
 525 err_enable_per:
 526         clk_disable_unprepare(fbi->clk_ahb);
 527 err_enable_ahb:
 528         clk_disable_unprepare(fbi->clk_ipg);
 529 err_enable_ipg:
 530         writel(0, fbi->regs + LCDC_RMCR);
 531
 532         return ret;
 533 }
 534
 535 static void imxfb_disable_controller(struct imxfb_info *fbi)
 536 {
 537         if (!fbi->enabled)
 538                 return;
 539
 540         pr_debug("Disabling LCD controller\n");
 541
 542         clk_disable_unprepare(fbi->clk_per);
 543         clk_disable_unprepare(fbi->clk_ahb);
 544         clk_disable_unprepare(fbi->clk_ipg);
 545         fbi->enabled = false;
 546
 547         writel(0, fbi->regs + LCDC_RMCR);
 548 }
 549
 550 static int imxfb_blank(int blank, struct fb_info *info)
 551 {
 552         struct imxfb_info *fbi = info->par;
 553
 554         pr_debug("imxfb_blank: blank=%d\n", blank);
 555
 556         switch (blank) {
 557         case FB_BLANK_POWERDOWN:
 558         case FB_BLANK_VSYNC_SUSPEND:
 559         case FB_BLANK_HSYNC_SUSPEND:
 560         case FB_BLANK_NORMAL:
 561                 imxfb_disable_controller(fbi);
 562                 break;
 563
 564         case FB_BLANK_UNBLANK:
 565                 return imxfb_enable_controller(fbi);
 566         }
 567         return 0;
 568 }
 569
 570 static const struct fb_ops imxfb_ops = {
 571         .owner          = THIS_MODULE,
 572         .fb_check_var   = imxfb_check_var,
 573         .fb_set_par     = imxfb_set_par,
 574         .fb_setcolreg   = imxfb_setcolreg,
 575         .fb_fillrect    = cfb_fillrect,
 576         .fb_copyarea    = cfb_copyarea,
 577         .fb_imageblit   = cfb_imageblit,
 578         .fb_blank       = imxfb_blank,
 579 };
 580
 581 /*
 582  * imxfb_activate_var():
 583  *      Configures LCD Controller based on entries in var parameter.  Settings are
 584  *      only written to the controller if changes were made.
 585  */
 586 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
 587 {
 588         struct imxfb_info *fbi = info->par;
 589         u32 ymax_mask = is_imx1_fb(fbi) ? YMAX_MASK_IMX1 : YMAX_MASK_IMX21;
 590
 591         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 592                 var->xres, var->hsync_len,
 593                 var->left_margin, var->right_margin);
 594         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 595                 var->yres, var->vsync_len,
 596                 var->upper_margin, var->lower_margin);
 597
 598 #if DEBUG_VAR
 599         if (var->xres < 16        || var->xres > 1024)
 600                 printk(KERN_ERR "%s: invalid xres %d\n",
 601                         info->fix.id, var->xres);
 602         if (var->hsync_len < 1    || var->hsync_len > 64)
 603                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 604                         info->fix.id, var->hsync_len);
 605         if (var->left_margin > 255)
 606                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 607                         info->fix.id, var->left_margin);
 608         if (var->right_margin > 255)
 609                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 610                         info->fix.id, var->right_margin);
 611         if (var->yres < 1 || var->yres > ymax_mask)
 612                 printk(KERN_ERR "%s: invalid yres %d\n",
 613                         info->fix.id, var->yres);
 614         if (var->vsync_len > 100)
 615                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 616                         info->fix.id, var->vsync_len);
 617         if (var->upper_margin > 63)
 618                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 619                         info->fix.id, var->upper_margin);
 620         if (var->lower_margin > 255)
 621                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 622                         info->fix.id, var->lower_margin);
 623 #endif
 624
 625         /* physical screen start address            */
 626         writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
 627                 fbi->regs + LCDC_VPW);
 628
 629         writel(HCR_H_WIDTH(var->hsync_len - 1) |
 630                 HCR_H_WAIT_1(var->right_margin - 1) |
 631                 HCR_H_WAIT_2(var->left_margin - 3),
 632                 fbi->regs + LCDC_HCR);
 633
 634         writel(VCR_V_WIDTH(var->vsync_len) |
 635                 VCR_V_WAIT_1(var->lower_margin) |
 636                 VCR_V_WAIT_2(var->upper_margin),
 637                 fbi->regs + LCDC_VCR);
 638
 639         writel(SIZE_XMAX(var->xres) | (var->yres & ymax_mask),
 640                         fbi->regs + LCDC_SIZE);
 641
 642         writel(fbi->pcr, fbi->regs + LCDC_PCR);
 643         if (fbi->pwmr)
 644                 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 645         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
 646
 647         /* dmacr = 0 is no valid value, as we need DMA control marks. */
 648         if (fbi->dmacr)
 649                 writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
 650
 651         if (fbi->lauscr)
 652                 writel(fbi->lauscr, fbi->regs + LCDC_LAUSCR);
 653
 654         return 0;
 655 }
 656
 657 static int imxfb_init_fbinfo(struct platform_device *pdev)
 658 {
 659         struct imx_fb_platform_data *pdata = dev_get_platdata(&pdev->dev);
 660         struct fb_info *info = platform_get_drvdata(pdev);
 661         struct imxfb_info *fbi = info->par;
 662         struct device_node *np;
 663
 664         pr_debug("%s\n",__func__);
 665
 666         info->pseudo_palette = kmalloc_array(16, sizeof(u32), GFP_KERNEL);
 667         if (!info->pseudo_palette)
 668                 return -ENOMEM;
 669
 670         memset(fbi, 0, sizeof(struct imxfb_info));
 671
 672         fbi->devtype = pdev->id_entry->driver_data;
 673
 674         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 675
 676         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
 677         info->fix.type_aux              = 0;
 678         info->fix.xpanstep              = 0;
 679         info->fix.ypanstep              = 0;
 680         info->fix.ywrapstep             = 0;
 681         info->fix.accel                 = FB_ACCEL_NONE;
 682
 683         info->var.nonstd                = 0;
 684         info->var.activate              = FB_ACTIVATE_NOW;
 685         info->var.height                = -1;
 686         info->var.width = -1;
 687         info->var.accel_flags           = 0;
 688         info->var.vmode                 = FB_VMODE_NONINTERLACED;
 689
 690         info->fbops                     = &imxfb_ops;
 691         info->flags                     = FBINFO_FLAG_DEFAULT |
 692                                           FBINFO_READS_FAST;
 693         if (pdata) {
 694                 fbi->lscr1                      = pdata->lscr1;
 695                 fbi->dmacr                      = pdata->dmacr;
 696                 fbi->pwmr                       = pdata->pwmr;
 697         } else {
 698                 np = pdev->dev.of_node;
 699                 info->var.grayscale = of_property_read_bool(np,
 700                                                 "cmap-greyscale");
 701                 fbi->cmap_inverse = of_property_read_bool(np, "cmap-inverse");
 702                 fbi->cmap_static = of_property_read_bool(np, "cmap-static");
 703
 704                 fbi->lscr1 = IMXFB_LSCR1_DEFAULT;
 705
 706                 of_property_read_u32(np, "fsl,lpccr", &fbi->pwmr);
 707
 708                 of_property_read_u32(np, "fsl,lscr1", &fbi->lscr1);
 709
 710                 of_property_read_u32(np, "fsl,dmacr", &fbi->dmacr);
 711         }
 712
 713         return 0;
 714 }
 715
 716 static int imxfb_of_read_mode(struct device *dev, struct device_node *np,
 717                 struct imx_fb_videomode *imxfb_mode)
 718 {
 719         int ret;
 720         struct fb_videomode *of_mode = &imxfb_mode->mode;
 721         u32 bpp;
 722         u32 pcr;
 723
 724         ret = of_property_read_string(np, "model", &of_mode->name);
 725         if (ret)
 726                 of_mode->name = NULL;
 727
 728         ret = of_get_fb_videomode(np, of_mode, OF_USE_NATIVE_MODE);
 729         if (ret) {
 730                 dev_err(dev, "Failed to get videomode from DT\n");
 731                 return ret;
 732         }
 733
 734         ret = of_property_read_u32(np, "bits-per-pixel", &bpp);
 735         ret |= of_property_read_u32(np, "fsl,pcr", &pcr);
 736
 737         if (ret) {
 738                 dev_err(dev, "Failed to read bpp and pcr from DT\n");
 739                 return -EINVAL;
 740         }
 741
 742         if (bpp < 1 || bpp > 255) {
 743                 dev_err(dev, "Bits per pixel have to be between 1 and 255\n");
 744                 return -EINVAL;
 745         }
 746
 747         imxfb_mode->bpp = bpp;
 748         imxfb_mode->pcr = pcr;
 749
 750         /*
 751          * fsl,aus-mode is optional
 752          */
 753         imxfb_mode->aus_mode = of_property_read_bool(np, "fsl,aus-mode");
 754
 755         return 0;
 756 }
 757
 758 static int imxfb_lcd_check_fb(struct lcd_device *lcddev, struct fb_info *fi)
 759 {
 760         struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
 761
 762         if (!fi || fi->par == fbi)
 763                 return 1;
 764
 765         return 0;
 766 }
 767
 768 static int imxfb_lcd_get_contrast(struct lcd_device *lcddev)
 769 {
 770         struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
 771
 772         return fbi->pwmr & 0xff;
 773 }
 774
 775 static int imxfb_lcd_set_contrast(struct lcd_device *lcddev, int contrast)
 776 {
 777         struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
 778
 779         if (fbi->pwmr && fbi->enabled) {
 780                 if (contrast > 255)
 781                         contrast = 255;
 782                 else if (contrast < 0)
 783                         contrast = 0;
 784
 785                 fbi->pwmr &= ~0xff;
 786                 fbi->pwmr |= contrast;
 787
 788                 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 789         }
 790
 791         return 0;
 792 }
 793
 794 static int imxfb_lcd_get_power(struct lcd_device *lcddev)
 795 {
 796         struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
 797
 798         if (!IS_ERR(fbi->lcd_pwr) &&
 799             !regulator_is_enabled(fbi->lcd_pwr))
 800                 return FB_BLANK_POWERDOWN;
 801
 802         return FB_BLANK_UNBLANK;
 803 }
 804
 805 static int imxfb_regulator_set(struct imxfb_info *fbi, int enable)
 806 {
 807         int ret;
 808
 809         if (enable == fbi->lcd_pwr_enabled)
 810                 return 0;
 811
 812         if (enable)
 813                 ret = regulator_enable(fbi->lcd_pwr);
 814         else
 815                 ret = regulator_disable(fbi->lcd_pwr);
 816
 817         if (ret == 0)
 818                 fbi->lcd_pwr_enabled = enable;
 819
 820         return ret;
 821 }
 822
 823 static int imxfb_lcd_set_power(struct lcd_device *lcddev, int power)
 824 {
 825         struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
 826
 827         if (!IS_ERR(fbi->lcd_pwr))
 828                 return imxfb_regulator_set(fbi, power == FB_BLANK_UNBLANK);
 829
 830         return 0;
 831 }
 832
 833 static struct lcd_ops imxfb_lcd_ops = {
 834         .check_fb       = imxfb_lcd_check_fb,
 835         .get_contrast   = imxfb_lcd_get_contrast,
 836         .set_contrast   = imxfb_lcd_set_contrast,
 837         .get_power      = imxfb_lcd_get_power,
 838         .set_power      = imxfb_lcd_set_power,
 839 };
 840
 841 static int imxfb_setup(void)
 842 {
 843         char *opt, *options = NULL;
 844
 845         if (fb_get_options("imxfb", &options))
 846                 return -ENODEV;
 847
 848         if (!options || !*options)
 849                 return 0;
 850
 851         while ((opt = strsep(&options, ",")) != NULL) {
 852                 if (!*opt)
 853                         continue;
 854                 else
 855                         fb_mode = opt;
 856         }
 857
 858         return 0;
 859 }
 860
 861 static int imxfb_probe(struct platform_device *pdev)
 862 {
 863         struct imxfb_info *fbi;
 864         struct lcd_device *lcd;
 865         struct fb_info *info;
 866         struct imx_fb_platform_data *pdata;
 867         struct resource *res;
 868         struct imx_fb_videomode *m;
 869         const struct of_device_id *of_id;
 870         int ret, i;
 871         int bytes_per_pixel;
 872
 873         dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
 874
 875         ret = imxfb_setup();
 876         if (ret < 0)
 877                 return ret;
 878
 879         of_id = of_match_device(imxfb_of_dev_id, &pdev->dev);
 880         if (of_id)
 881                 pdev->id_entry = of_id->data;
 882
 883         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 884         if (!res)
 885                 return -ENODEV;
 886
 887         pdata = dev_get_platdata(&pdev->dev);
 888
 889         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
 890         if (!info)
 891                 return -ENOMEM;
 892
 893         fbi = info->par;
 894
 895         platform_set_drvdata(pdev, info);
 896
 897         ret = imxfb_init_fbinfo(pdev);
 898         if (ret < 0)
 899                 goto failed_init;
 900
 901         if (pdata) {
 902                 if (!fb_mode)
 903                         fb_mode = pdata->mode[0].mode.name;
 904
 905                 fbi->mode = pdata->mode;
 906                 fbi->num_modes = pdata->num_modes;
 907         } else {
 908                 struct device_node *display_np;
 909                 fb_mode = NULL;
 910
 911                 display_np = of_parse_phandle(pdev->dev.of_node, "display", 0);
 912                 if (!display_np) {
 913                         dev_err(&pdev->dev, "No display defined in devicetree\n");
 914                         ret = -EINVAL;
 915                         goto failed_of_parse;
 916                 }
 917
 918                 /*
 919                  * imxfb does not support more modes, we choose only the native
 920                  * mode.
 921                  */
 922                 fbi->num_modes = 1;
 923
 924                 fbi->mode = devm_kzalloc(&pdev->dev,
 925                                 sizeof(struct imx_fb_videomode), GFP_KERNEL);
 926                 if (!fbi->mode) {
 927                         ret = -ENOMEM;
 928                         goto failed_of_parse;
 929                 }
 930
 931                 ret = imxfb_of_read_mode(&pdev->dev, display_np, fbi->mode);
 932                 if (ret)
 933                         goto failed_of_parse;
 934         }
 935
 936         /* Calculate maximum bytes used per pixel. In most cases this should
 937          * be the same as m->bpp/8 */
 938         m = &fbi->mode[0];
 939         bytes_per_pixel = (m->bpp + 7) / 8;
 940         for (i = 0; i < fbi->num_modes; i++, m++)
 941                 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
 942                                 m->mode.xres * m->mode.yres * bytes_per_pixel);
 943
 944         res = request_mem_region(res->start, resource_size(res),
 945                                 DRIVER_NAME);
 946         if (!res) {
 947                 ret = -EBUSY;
 948                 goto failed_req;
 949         }
 950
 951         fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
 952         if (IS_ERR(fbi->clk_ipg)) {
 953                 ret = PTR_ERR(fbi->clk_ipg);
 954                 goto failed_getclock;
 955         }
 956
 957         /*
 958          * The LCDC controller does not have an enable bit. The
 959          * controller starts directly when the clocks are enabled.
 960          * If the clocks are enabled when the controller is not yet
 961          * programmed with proper register values (enabled at the
 962          * bootloader, for example) then it just goes into some undefined
 963          * state.
 964          * To avoid this issue, let's enable and disable LCDC IPG clock
 965          * so that we force some kind of 'reset' to the LCDC block.
 966          */
 967         ret = clk_prepare_enable(fbi->clk_ipg);
 968         if (ret)
 969                 goto failed_getclock;
 970         clk_disable_unprepare(fbi->clk_ipg);
 971
 972         fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
 973         if (IS_ERR(fbi->clk_ahb)) {
 974                 ret = PTR_ERR(fbi->clk_ahb);
 975                 goto failed_getclock;
 976         }
 977
 978         fbi->clk_per = devm_clk_get(&pdev->dev, "per");
 979         if (IS_ERR(fbi->clk_per)) {
 980                 ret = PTR_ERR(fbi->clk_per);
 981                 goto failed_getclock;
 982         }
 983
 984         fbi->regs = ioremap(res->start, resource_size(res));
 985         if (fbi->regs == NULL) {
 986                 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
 987                 ret = -ENOMEM;
 988                 goto failed_ioremap;
 989         }
 990
 991         fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
 992         info->screen_buffer = dma_alloc_wc(&pdev->dev, fbi->map_size,
 993                                            &fbi->map_dma, GFP_KERNEL);
 994         if (!info->screen_buffer) {
 995                 dev_err(&pdev->dev, "Failed to allocate video RAM\n");
 996                 ret = -ENOMEM;
 997                 goto failed_map;
 998         }
 999
1000         info->fix.smem_start = fbi->map_dma;
1001
1002         if (pdata && pdata->init) {
1003                 ret = pdata->init(fbi->pdev);
1004                 if (ret)
1005                         goto failed_platform_init;
1006         }
1007
1008
1009         INIT_LIST_HEAD(&info->modelist);
1010         for (i = 0; i < fbi->num_modes; i++)
1011                 fb_add_videomode(&fbi->mode[i].mode, &info->modelist);
1012
1013         /*
1014          * This makes sure that our colour bitfield
1015          * descriptors are correctly initialised.
1016          */
1017         imxfb_check_var(&info->var, info);
1018
1019         /*
1020          * For modes > 8bpp, the color map is bypassed.
1021          * Therefore, 256 entries are enough.
1022          */
1023         ret = fb_alloc_cmap(&info->cmap, 256, 0);
1024         if (ret < 0)
1025                 goto failed_cmap;
1026
1027         imxfb_set_par(info);
1028         ret = register_framebuffer(info);
1029         if (ret < 0) {
1030                 dev_err(&pdev->dev, "failed to register framebuffer\n");
1031                 goto failed_register;
1032         }
1033
1034         fbi->lcd_pwr = devm_regulator_get(&pdev->dev, "lcd");
1035         if (PTR_ERR(fbi->lcd_pwr) == -EPROBE_DEFER) {
1036                 ret = -EPROBE_DEFER;
1037                 goto failed_lcd;
1038         }
1039
1040         lcd = devm_lcd_device_register(&pdev->dev, "imxfb-lcd", &pdev->dev, fbi,
1041                                        &imxfb_lcd_ops);
1042         if (IS_ERR(lcd)) {
1043                 ret = PTR_ERR(lcd);
1044                 goto failed_lcd;
1045         }
1046
1047         lcd->props.max_contrast = 0xff;
1048
1049         imxfb_enable_controller(fbi);
1050         fbi->pdev = pdev;
1051
1052         return 0;
1053
1054 failed_lcd:
1055         unregister_framebuffer(info);
1056
1057 failed_register:
1058         fb_dealloc_cmap(&info->cmap);
1059 failed_cmap:
1060         if (pdata && pdata->exit)
1061                 pdata->exit(fbi->pdev);
1062 failed_platform_init:
1063         dma_free_wc(&pdev->dev, fbi->map_size, info->screen_buffer,
1064                     fbi->map_dma);
1065 failed_map:
1066         iounmap(fbi->regs);
1067 failed_ioremap:
1068 failed_getclock:
1069         release_mem_region(res->start, resource_size(res));
1070 failed_req:
1071 failed_of_parse:
1072         kfree(info->pseudo_palette);
1073 failed_init:
1074         framebuffer_release(info);
1075         return ret;
1076 }
1077
1078 static int imxfb_remove(struct platform_device *pdev)
1079 {
1080         struct imx_fb_platform_data *pdata;
1081         struct fb_info *info = platform_get_drvdata(pdev);
1082         struct imxfb_info *fbi = info->par;
1083         struct resource *res;
1084
1085         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1086
1087         imxfb_disable_controller(fbi);
1088
1089         unregister_framebuffer(info);
1090         fb_dealloc_cmap(&info->cmap);
1091         pdata = dev_get_platdata(&pdev->dev);
1092         if (pdata && pdata->exit)
1093                 pdata->exit(fbi->pdev);
1094         dma_free_wc(&pdev->dev, fbi->map_size, info->screen_buffer,
1095                     fbi->map_dma);
1096         iounmap(fbi->regs);
1097         release_mem_region(res->start, resource_size(res));
1098         kfree(info->pseudo_palette);
1099         framebuffer_release(info);
1100
1101         return 0;
1102 }
1103
1104 static int __maybe_unused imxfb_suspend(struct device *dev)
1105 {
1106         struct fb_info *info = dev_get_drvdata(dev);
1107         struct imxfb_info *fbi = info->par;
1108
1109         imxfb_disable_controller(fbi);
1110
1111         return 0;
1112 }
1113
1114 static int __maybe_unused imxfb_resume(struct device *dev)
1115 {
1116         struct fb_info *info = dev_get_drvdata(dev);
1117         struct imxfb_info *fbi = info->par;
1118
1119         imxfb_enable_controller(fbi);
1120
1121         return 0;
1122 }
1123
1124 static SIMPLE_DEV_PM_OPS(imxfb_pm_ops, imxfb_suspend, imxfb_resume);
1125
1126 static struct platform_driver imxfb_driver = {
1127         .driver         = {
1128                 .name   = DRIVER_NAME,
1129                 .of_match_table = imxfb_of_dev_id,
1130                 .pm     = &imxfb_pm_ops,
1131         },
1132         .probe          = imxfb_probe,
1133         .remove         = imxfb_remove,
1134         .id_table       = imxfb_devtype,
1135 };
1136 module_platform_driver(imxfb_driver);
1137
1138 MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
1139 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1140 MODULE_LICENSE("GPL");