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