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