drivers/video/mxsfb.c

   1 /*
   2  * Copyright (C) 2010 Juergen Beisert, Pengutronix
   3  *
   4  * This code is based on:
   5  * Author: Vitaly Wool <vital@embeddedalley.com>
   6  *
   7  * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
   8  * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  */
  19
  20 #define DRIVER_NAME "mxsfb"
  21
  22 /**
  23  * @file
  24  * @brief LCDIF driver for i.MX23 and i.MX28
  25  *
  26  * The LCDIF support four modes of operation
  27  * - MPU interface (to drive smart displays) -> not supported yet
  28  * - VSYNC interface (like MPU interface plus Vsync) -> not supported yet
  29  * - Dotclock interface (to drive LC displays with RGB data and sync signals)
  30  * - DVI (to drive ITU-R BT656)  -> not supported yet
  31  *
  32  * This driver depends on a correct setup of the pins used for this purpose
  33  * (platform specific).
  34  *
  35  * For the developer: Don't forget to set the data bus width to the display
  36  * in the imx_fb_videomode structure. You will else end up with ugly colours.
  37  * If you fight against jitter you can vary the clock delay. This is a feature
  38  * of the i.MX28 and you can vary it between 2 ns ... 8 ns in 2 ns steps. Give
  39  * the required value in the imx_fb_videomode structure.
  40  */
  41
  42 #include <linux/module.h>
  43 #include <linux/kernel.h>
  44 #include <linux/of_device.h>
  45 #include <linux/platform_device.h>
  46 #include <linux/clk.h>
  47 #include <linux/dma-mapping.h>
  48 #include <linux/io.h>
  49 #include <linux/fb.h>
  50 #include <linux/regulator/consumer.h>
  51 #include <video/of_display_timing.h>
  52 #include <video/of_videomode.h>
  53 #include <video/videomode.h>
  54
  55 #define REG_SET 4
  56 #define REG_CLR 8
  57
  58 #define LCDC_CTRL                       0x00
  59 #define LCDC_CTRL1                      0x10
  60 #define LCDC_V4_CTRL2                   0x20
  61 #define LCDC_V3_TRANSFER_COUNT          0x20
  62 #define LCDC_V4_TRANSFER_COUNT          0x30
  63 #define LCDC_V4_CUR_BUF                 0x40
  64 #define LCDC_V4_NEXT_BUF                0x50
  65 #define LCDC_V3_CUR_BUF                 0x30
  66 #define LCDC_V3_NEXT_BUF                0x40
  67 #define LCDC_TIMING                     0x60
  68 #define LCDC_VDCTRL0                    0x70
  69 #define LCDC_VDCTRL1                    0x80
  70 #define LCDC_VDCTRL2                    0x90
  71 #define LCDC_VDCTRL3                    0xa0
  72 #define LCDC_VDCTRL4                    0xb0
  73 #define LCDC_DVICTRL0                   0xc0
  74 #define LCDC_DVICTRL1                   0xd0
  75 #define LCDC_DVICTRL2                   0xe0
  76 #define LCDC_DVICTRL3                   0xf0
  77 #define LCDC_DVICTRL4                   0x100
  78 #define LCDC_V4_DATA                    0x180
  79 #define LCDC_V3_DATA                    0x1b0
  80 #define LCDC_V4_DEBUG0                  0x1d0
  81 #define LCDC_V3_DEBUG0                  0x1f0
  82
  83 #define CTRL_SFTRST                     (1 << 31)
  84 #define CTRL_CLKGATE                    (1 << 30)
  85 #define CTRL_BYPASS_COUNT               (1 << 19)
  86 #define CTRL_VSYNC_MODE                 (1 << 18)
  87 #define CTRL_DOTCLK_MODE                (1 << 17)
  88 #define CTRL_DATA_SELECT                (1 << 16)
  89 #define CTRL_SET_BUS_WIDTH(x)           (((x) & 0x3) << 10)
  90 #define CTRL_GET_BUS_WIDTH(x)           (((x) >> 10) & 0x3)
  91 #define CTRL_SET_WORD_LENGTH(x)         (((x) & 0x3) << 8)
  92 #define CTRL_GET_WORD_LENGTH(x)         (((x) >> 8) & 0x3)
  93 #define CTRL_MASTER                     (1 << 5)
  94 #define CTRL_DF16                       (1 << 3)
  95 #define CTRL_DF18                       (1 << 2)
  96 #define CTRL_DF24                       (1 << 1)
  97 #define CTRL_RUN                        (1 << 0)
  98
  99 #define CTRL1_FIFO_CLEAR                (1 << 21)
 100 #define CTRL1_SET_BYTE_PACKAGING(x)     (((x) & 0xf) << 16)
 101 #define CTRL1_GET_BYTE_PACKAGING(x)     (((x) >> 16) & 0xf)
 102
 103 #define TRANSFER_COUNT_SET_VCOUNT(x)    (((x) & 0xffff) << 16)
 104 #define TRANSFER_COUNT_GET_VCOUNT(x)    (((x) >> 16) & 0xffff)
 105 #define TRANSFER_COUNT_SET_HCOUNT(x)    ((x) & 0xffff)
 106 #define TRANSFER_COUNT_GET_HCOUNT(x)    ((x) & 0xffff)
 107
 108
 109 #define VDCTRL0_ENABLE_PRESENT          (1 << 28)
 110 #define VDCTRL0_VSYNC_ACT_HIGH          (1 << 27)
 111 #define VDCTRL0_HSYNC_ACT_HIGH          (1 << 26)
 112 #define VDCTRL0_DOTCLK_ACT_FALLING      (1 << 25)
 113 #define VDCTRL0_ENABLE_ACT_HIGH         (1 << 24)
 114 #define VDCTRL0_VSYNC_PERIOD_UNIT       (1 << 21)
 115 #define VDCTRL0_VSYNC_PULSE_WIDTH_UNIT  (1 << 20)
 116 #define VDCTRL0_HALF_LINE               (1 << 19)
 117 #define VDCTRL0_HALF_LINE_MODE          (1 << 18)
 118 #define VDCTRL0_SET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
 119 #define VDCTRL0_GET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
 120
 121 #define VDCTRL2_SET_HSYNC_PERIOD(x)     ((x) & 0x3ffff)
 122 #define VDCTRL2_GET_HSYNC_PERIOD(x)     ((x) & 0x3ffff)
 123
 124 #define VDCTRL3_MUX_SYNC_SIGNALS        (1 << 29)
 125 #define VDCTRL3_VSYNC_ONLY              (1 << 28)
 126 #define SET_HOR_WAIT_CNT(x)             (((x) & 0xfff) << 16)
 127 #define GET_HOR_WAIT_CNT(x)             (((x) >> 16) & 0xfff)
 128 #define SET_VERT_WAIT_CNT(x)            ((x) & 0xffff)
 129 #define GET_VERT_WAIT_CNT(x)            ((x) & 0xffff)
 130
 131 #define VDCTRL4_SET_DOTCLK_DLY(x)       (((x) & 0x7) << 29) /* v4 only */
 132 #define VDCTRL4_GET_DOTCLK_DLY(x)       (((x) >> 29) & 0x7) /* v4 only */
 133 #define VDCTRL4_SYNC_SIGNALS_ON         (1 << 18)
 134 #define SET_DOTCLK_H_VALID_DATA_CNT(x)  ((x) & 0x3ffff)
 135
 136 #define DEBUG0_HSYNC                    (1 < 26)
 137 #define DEBUG0_VSYNC                    (1 < 25)
 138
 139 #define MIN_XRES                        120
 140 #define MIN_YRES                        120
 141
 142 #define RED 0
 143 #define GREEN 1
 144 #define BLUE 2
 145 #define TRANSP 3
 146
 147 #define STMLCDIF_8BIT  1 /** pixel data bus to the display is of 8 bit width */
 148 #define STMLCDIF_16BIT 0 /** pixel data bus to the display is of 16 bit width */
 149 #define STMLCDIF_18BIT 2 /** pixel data bus to the display is of 18 bit width */
 150 #define STMLCDIF_24BIT 3 /** pixel data bus to the display is of 24 bit width */
 151
 152 #define MXSFB_SYNC_DATA_ENABLE_HIGH_ACT (1 << 6)
 153 #define MXSFB_SYNC_DOTCLK_FALLING_ACT   (1 << 7) /* negtive edge sampling */
 154
 155 enum mxsfb_devtype {
 156         MXSFB_V3,
 157         MXSFB_V4,
 158 };
 159
 160 /* CPU dependent register offsets */
 161 struct mxsfb_devdata {
 162         unsigned transfer_count;
 163         unsigned cur_buf;
 164         unsigned next_buf;
 165         unsigned debug0;
 166         unsigned hs_wdth_mask;
 167         unsigned hs_wdth_shift;
 168         unsigned ipversion;
 169 };
 170
 171 struct mxsfb_info {
 172         struct fb_info fb_info;
 173         struct platform_device *pdev;
 174         struct clk *clk;
 175         void __iomem *base;     /* registers */
 176         unsigned allocated_size;
 177         int enabled;
 178         unsigned ld_intf_width;
 179         unsigned dotclk_delay;
 180         const struct mxsfb_devdata *devdata;
 181         u32 sync;
 182         struct regulator *reg_lcd;
 183 };
 184
 185 #define mxsfb_is_v3(host) (host->devdata->ipversion == 3)
 186 #define mxsfb_is_v4(host) (host->devdata->ipversion == 4)
 187
 188 static const struct mxsfb_devdata mxsfb_devdata[] = {
 189         [MXSFB_V3] = {
 190                 .transfer_count = LCDC_V3_TRANSFER_COUNT,
 191                 .cur_buf = LCDC_V3_CUR_BUF,
 192                 .next_buf = LCDC_V3_NEXT_BUF,
 193                 .debug0 = LCDC_V3_DEBUG0,
 194                 .hs_wdth_mask = 0xff,
 195                 .hs_wdth_shift = 24,
 196                 .ipversion = 3,
 197         },
 198         [MXSFB_V4] = {
 199                 .transfer_count = LCDC_V4_TRANSFER_COUNT,
 200                 .cur_buf = LCDC_V4_CUR_BUF,
 201                 .next_buf = LCDC_V4_NEXT_BUF,
 202                 .debug0 = LCDC_V4_DEBUG0,
 203                 .hs_wdth_mask = 0x3fff,
 204                 .hs_wdth_shift = 18,
 205                 .ipversion = 4,
 206         },
 207 };
 208
 209 #define to_imxfb_host(x) (container_of(x, struct mxsfb_info, fb_info))
 210
 211 /* mask and shift depends on architecture */
 212 static inline u32 set_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
 213 {
 214         return (val & host->devdata->hs_wdth_mask) <<
 215                 host->devdata->hs_wdth_shift;
 216 }
 217
 218 static inline u32 get_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
 219 {
 220         return (val >> host->devdata->hs_wdth_shift) &
 221                 host->devdata->hs_wdth_mask;
 222 }
 223
 224 static const struct fb_bitfield def_rgb565[] = {
 225         [RED] = {
 226                 .offset = 11,
 227                 .length = 5,
 228         },
 229         [GREEN] = {
 230                 .offset = 5,
 231                 .length = 6,
 232         },
 233         [BLUE] = {
 234                 .offset = 0,
 235                 .length = 5,
 236         },
 237         [TRANSP] = {    /* no support for transparency */
 238                 .length = 0,
 239         }
 240 };
 241
 242 static const struct fb_bitfield def_rgb888[] = {
 243         [RED] = {
 244                 .offset = 16,
 245                 .length = 8,
 246         },
 247         [GREEN] = {
 248                 .offset = 8,
 249                 .length = 8,
 250         },
 251         [BLUE] = {
 252                 .offset = 0,
 253                 .length = 8,
 254         },
 255         [TRANSP] = {    /* no support for transparency */
 256                 .length = 0,
 257         }
 258 };
 259
 260 static inline unsigned chan_to_field(unsigned chan, struct fb_bitfield *bf)
 261 {
 262         chan &= 0xffff;
 263         chan >>= 16 - bf->length;
 264         return chan << bf->offset;
 265 }
 266
 267 static int mxsfb_check_var(struct fb_var_screeninfo *var,
 268                 struct fb_info *fb_info)
 269 {
 270         struct mxsfb_info *host = to_imxfb_host(fb_info);
 271         const struct fb_bitfield *rgb = NULL;
 272
 273         if (var->xres < MIN_XRES)
 274                 var->xres = MIN_XRES;
 275         if (var->yres < MIN_YRES)
 276                 var->yres = MIN_YRES;
 277
 278         var->xres_virtual = var->xres;
 279
 280         var->yres_virtual = var->yres;
 281
 282         switch (var->bits_per_pixel) {
 283         case 16:
 284                 /* always expect RGB 565 */
 285                 rgb = def_rgb565;
 286                 break;
 287         case 32:
 288                 switch (host->ld_intf_width) {
 289                 case STMLCDIF_8BIT:
 290                         pr_debug("Unsupported LCD bus width mapping\n");
 291                         break;
 292                 case STMLCDIF_16BIT:
 293                 case STMLCDIF_18BIT:
 294                 case STMLCDIF_24BIT:
 295                         /* real 24 bit */
 296                         rgb = def_rgb888;
 297                         break;
 298                 }
 299                 break;
 300         default:
 301                 pr_err("Unsupported colour depth: %u\n", var->bits_per_pixel);
 302                 return -EINVAL;
 303         }
 304
 305         /*
 306          * Copy the RGB parameters for this display
 307          * from the machine specific parameters.
 308          */
 309         var->red    = rgb[RED];
 310         var->green  = rgb[GREEN];
 311         var->blue   = rgb[BLUE];
 312         var->transp = rgb[TRANSP];
 313
 314         return 0;
 315 }
 316
 317 static void mxsfb_enable_controller(struct fb_info *fb_info)
 318 {
 319         struct mxsfb_info *host = to_imxfb_host(fb_info);
 320         u32 reg;
 321         int ret;
 322
 323         dev_dbg(&host->pdev->dev, "%s\n", __func__);
 324
 325         if (host->reg_lcd) {
 326                 ret = regulator_enable(host->reg_lcd);
 327                 if (ret) {
 328                         dev_err(&host->pdev->dev,
 329                                 "lcd regulator enable failed:   %d\n", ret);
 330                         return;
 331                 }
 332         }
 333
 334         clk_prepare_enable(host->clk);
 335         clk_set_rate(host->clk, PICOS2KHZ(fb_info->var.pixclock) * 1000U);
 336
 337         /* if it was disabled, re-enable the mode again */
 338         writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_SET);
 339
 340         /* enable the SYNC signals first, then the DMA engine */
 341         reg = readl(host->base + LCDC_VDCTRL4);
 342         reg |= VDCTRL4_SYNC_SIGNALS_ON;
 343         writel(reg, host->base + LCDC_VDCTRL4);
 344
 345         writel(CTRL_RUN, host->base + LCDC_CTRL + REG_SET);
 346
 347         host->enabled = 1;
 348 }
 349
 350 static void mxsfb_disable_controller(struct fb_info *fb_info)
 351 {
 352         struct mxsfb_info *host = to_imxfb_host(fb_info);
 353         unsigned loop;
 354         u32 reg;
 355         int ret;
 356
 357         dev_dbg(&host->pdev->dev, "%s\n", __func__);
 358
 359         /*
 360          * Even if we disable the controller here, it will still continue
 361          * until its FIFOs are running out of data
 362          */
 363         writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_CLR);
 364
 365         loop = 1000;
 366         while (loop) {
 367                 reg = readl(host->base + LCDC_CTRL);
 368                 if (!(reg & CTRL_RUN))
 369                         break;
 370                 loop--;
 371         }
 372
 373         reg = readl(host->base + LCDC_VDCTRL4);
 374         writel(reg & ~VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4);
 375
 376         clk_disable_unprepare(host->clk);
 377
 378         host->enabled = 0;
 379
 380         if (host->reg_lcd) {
 381                 ret = regulator_disable(host->reg_lcd);
 382                 if (ret)
 383                         dev_err(&host->pdev->dev,
 384                                 "lcd regulator disable failed: %d\n", ret);
 385         }
 386 }
 387
 388 static int mxsfb_set_par(struct fb_info *fb_info)
 389 {
 390         struct mxsfb_info *host = to_imxfb_host(fb_info);
 391         u32 ctrl, vdctrl0, vdctrl4;
 392         int line_size, fb_size;
 393         int reenable = 0;
 394
 395         line_size =  fb_info->var.xres * (fb_info->var.bits_per_pixel >> 3);
 396         fb_size = fb_info->var.yres_virtual * line_size;
 397
 398         if (fb_size > fb_info->fix.smem_len)
 399                 return -ENOMEM;
 400
 401         fb_info->fix.line_length = line_size;
 402
 403         /*
 404          * It seems, you can't re-program the controller if it is still running.
 405          * This may lead into shifted pictures (FIFO issue?).
 406          * So, first stop the controller and drain its FIFOs
 407          */
 408         if (host->enabled) {
 409                 reenable = 1;
 410                 mxsfb_disable_controller(fb_info);
 411         }
 412
 413         /* clear the FIFOs */
 414         writel(CTRL1_FIFO_CLEAR, host->base + LCDC_CTRL1 + REG_SET);
 415
 416         ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER |
 417                 CTRL_SET_BUS_WIDTH(host->ld_intf_width);
 418
 419         switch (fb_info->var.bits_per_pixel) {
 420         case 16:
 421                 dev_dbg(&host->pdev->dev, "Setting up RGB565 mode\n");
 422                 ctrl |= CTRL_SET_WORD_LENGTH(0);
 423                 writel(CTRL1_SET_BYTE_PACKAGING(0xf), host->base + LCDC_CTRL1);
 424                 break;
 425         case 32:
 426                 dev_dbg(&host->pdev->dev, "Setting up RGB888/666 mode\n");
 427                 ctrl |= CTRL_SET_WORD_LENGTH(3);
 428                 switch (host->ld_intf_width) {
 429                 case STMLCDIF_8BIT:
 430                         dev_err(&host->pdev->dev,
 431                                         "Unsupported LCD bus width mapping\n");
 432                         return -EINVAL;
 433                 case STMLCDIF_16BIT:
 434                 case STMLCDIF_18BIT:
 435                 case STMLCDIF_24BIT:
 436                         /* real 24 bit */
 437                         break;
 438                 }
 439                 /* do not use packed pixels = one pixel per word instead */
 440                 writel(CTRL1_SET_BYTE_PACKAGING(0x7), host->base + LCDC_CTRL1);
 441                 break;
 442         default:
 443                 dev_err(&host->pdev->dev, "Unhandled color depth of %u\n",
 444                                 fb_info->var.bits_per_pixel);
 445                 return -EINVAL;
 446         }
 447
 448         writel(ctrl, host->base + LCDC_CTRL);
 449
 450         writel(TRANSFER_COUNT_SET_VCOUNT(fb_info->var.yres) |
 451                         TRANSFER_COUNT_SET_HCOUNT(fb_info->var.xres),
 452                         host->base + host->devdata->transfer_count);
 453
 454         vdctrl0 = VDCTRL0_ENABLE_PRESENT |      /* always in DOTCLOCK mode */
 455                 VDCTRL0_VSYNC_PERIOD_UNIT |
 456                 VDCTRL0_VSYNC_PULSE_WIDTH_UNIT |
 457                 VDCTRL0_SET_VSYNC_PULSE_WIDTH(fb_info->var.vsync_len);
 458         if (fb_info->var.sync & FB_SYNC_HOR_HIGH_ACT)
 459                 vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH;
 460         if (fb_info->var.sync & FB_SYNC_VERT_HIGH_ACT)
 461                 vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH;
 462         if (host->sync & MXSFB_SYNC_DATA_ENABLE_HIGH_ACT)
 463                 vdctrl0 |= VDCTRL0_ENABLE_ACT_HIGH;
 464         if (host->sync & MXSFB_SYNC_DOTCLK_FALLING_ACT)
 465                 vdctrl0 |= VDCTRL0_DOTCLK_ACT_FALLING;
 466
 467         writel(vdctrl0, host->base + LCDC_VDCTRL0);
 468
 469         /* frame length in lines */
 470         writel(fb_info->var.upper_margin + fb_info->var.vsync_len +
 471                 fb_info->var.lower_margin + fb_info->var.yres,
 472                 host->base + LCDC_VDCTRL1);
 473
 474         /* line length in units of clocks or pixels */
 475         writel(set_hsync_pulse_width(host, fb_info->var.hsync_len) |
 476                 VDCTRL2_SET_HSYNC_PERIOD(fb_info->var.left_margin +
 477                 fb_info->var.hsync_len + fb_info->var.right_margin +
 478                 fb_info->var.xres),
 479                 host->base + LCDC_VDCTRL2);
 480
 481         writel(SET_HOR_WAIT_CNT(fb_info->var.left_margin +
 482                 fb_info->var.hsync_len) |
 483                 SET_VERT_WAIT_CNT(fb_info->var.upper_margin +
 484                         fb_info->var.vsync_len),
 485                 host->base + LCDC_VDCTRL3);
 486
 487         vdctrl4 = SET_DOTCLK_H_VALID_DATA_CNT(fb_info->var.xres);
 488         if (mxsfb_is_v4(host))
 489                 vdctrl4 |= VDCTRL4_SET_DOTCLK_DLY(host->dotclk_delay);
 490         writel(vdctrl4, host->base + LCDC_VDCTRL4);
 491
 492         writel(fb_info->fix.smem_start +
 493                         fb_info->fix.line_length * fb_info->var.yoffset,
 494                         host->base + host->devdata->next_buf);
 495
 496         if (reenable)
 497                 mxsfb_enable_controller(fb_info);
 498
 499         return 0;
 500 }
 501
 502 static int mxsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 503                 u_int transp, struct fb_info *fb_info)
 504 {
 505         unsigned int val;
 506         int ret = -EINVAL;
 507
 508         /*
 509          * If greyscale is true, then we convert the RGB value
 510          * to greyscale no matter what visual we are using.
 511          */
 512         if (fb_info->var.grayscale)
 513                 red = green = blue = (19595 * red + 38470 * green +
 514                                         7471 * blue) >> 16;
 515
 516         switch (fb_info->fix.visual) {
 517         case FB_VISUAL_TRUECOLOR:
 518                 /*
 519                  * 12 or 16-bit True Colour.  We encode the RGB value
 520                  * according to the RGB bitfield information.
 521                  */
 522                 if (regno < 16) {
 523                         u32 *pal = fb_info->pseudo_palette;
 524
 525                         val  = chan_to_field(red, &fb_info->var.red);
 526                         val |= chan_to_field(green, &fb_info->var.green);
 527                         val |= chan_to_field(blue, &fb_info->var.blue);
 528
 529                         pal[regno] = val;
 530                         ret = 0;
 531                 }
 532                 break;
 533
 534         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 535         case FB_VISUAL_PSEUDOCOLOR:
 536                 break;
 537         }
 538
 539         return ret;
 540 }
 541
 542 static int mxsfb_blank(int blank, struct fb_info *fb_info)
 543 {
 544         struct mxsfb_info *host = to_imxfb_host(fb_info);
 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                 if (host->enabled)
 552                         mxsfb_disable_controller(fb_info);
 553                 break;
 554
 555         case FB_BLANK_UNBLANK:
 556                 if (!host->enabled)
 557                         mxsfb_enable_controller(fb_info);
 558                 break;
 559         }
 560         return 0;
 561 }
 562
 563 static int mxsfb_pan_display(struct fb_var_screeninfo *var,
 564                 struct fb_info *fb_info)
 565 {
 566         struct mxsfb_info *host = to_imxfb_host(fb_info);
 567         unsigned offset;
 568
 569         if (var->xoffset != 0)
 570                 return -EINVAL;
 571
 572         offset = fb_info->fix.line_length * var->yoffset;
 573
 574         /* update on next VSYNC */
 575         writel(fb_info->fix.smem_start + offset,
 576                         host->base + host->devdata->next_buf);
 577
 578         return 0;
 579 }
 580
 581 static struct fb_ops mxsfb_ops = {
 582         .owner = THIS_MODULE,
 583         .fb_check_var = mxsfb_check_var,
 584         .fb_set_par = mxsfb_set_par,
 585         .fb_setcolreg = mxsfb_setcolreg,
 586         .fb_blank = mxsfb_blank,
 587         .fb_pan_display = mxsfb_pan_display,
 588         .fb_fillrect = cfb_fillrect,
 589         .fb_copyarea = cfb_copyarea,
 590         .fb_imageblit = cfb_imageblit,
 591 };
 592
 593 static int mxsfb_restore_mode(struct mxsfb_info *host,
 594                         struct fb_videomode *vmode)
 595 {
 596         struct fb_info *fb_info = &host->fb_info;
 597         unsigned line_count;
 598         unsigned period;
 599         unsigned long pa, fbsize;
 600         int bits_per_pixel, ofs;
 601         u32 transfer_count, vdctrl0, vdctrl2, vdctrl3, vdctrl4, ctrl;
 602
 603         /* Only restore the mode when the controller is running */
 604         ctrl = readl(host->base + LCDC_CTRL);
 605         if (!(ctrl & CTRL_RUN))
 606                 return -EINVAL;
 607
 608         vdctrl0 = readl(host->base + LCDC_VDCTRL0);
 609         vdctrl2 = readl(host->base + LCDC_VDCTRL2);
 610         vdctrl3 = readl(host->base + LCDC_VDCTRL3);
 611         vdctrl4 = readl(host->base + LCDC_VDCTRL4);
 612
 613         transfer_count = readl(host->base + host->devdata->transfer_count);
 614
 615         vmode->xres = TRANSFER_COUNT_GET_HCOUNT(transfer_count);
 616         vmode->yres = TRANSFER_COUNT_GET_VCOUNT(transfer_count);
 617
 618         switch (CTRL_GET_WORD_LENGTH(ctrl)) {
 619         case 0:
 620                 bits_per_pixel = 16;
 621                 break;
 622         case 3:
 623                 bits_per_pixel = 32;
 624                 break;
 625         case 1:
 626         default:
 627                 return -EINVAL;
 628         }
 629
 630         fb_info->var.bits_per_pixel = bits_per_pixel;
 631
 632         vmode->pixclock = KHZ2PICOS(clk_get_rate(host->clk) / 1000U);
 633         vmode->hsync_len = get_hsync_pulse_width(host, vdctrl2);
 634         vmode->left_margin = GET_HOR_WAIT_CNT(vdctrl3) - vmode->hsync_len;
 635         vmode->right_margin = VDCTRL2_GET_HSYNC_PERIOD(vdctrl2) -
 636                 vmode->hsync_len - vmode->left_margin - vmode->xres;
 637         vmode->vsync_len = VDCTRL0_GET_VSYNC_PULSE_WIDTH(vdctrl0);
 638         period = readl(host->base + LCDC_VDCTRL1);
 639         vmode->upper_margin = GET_VERT_WAIT_CNT(vdctrl3) - vmode->vsync_len;
 640         vmode->lower_margin = period - vmode->vsync_len -
 641                 vmode->upper_margin - vmode->yres;
 642
 643         vmode->vmode = FB_VMODE_NONINTERLACED;
 644
 645         vmode->sync = 0;
 646         if (vdctrl0 & VDCTRL0_HSYNC_ACT_HIGH)
 647                 vmode->sync |= FB_SYNC_HOR_HIGH_ACT;
 648         if (vdctrl0 & VDCTRL0_VSYNC_ACT_HIGH)
 649                 vmode->sync |= FB_SYNC_VERT_HIGH_ACT;
 650
 651         pr_debug("Reconstructed video mode:\n");
 652         pr_debug("%dx%d, hsync: %u left: %u, right: %u, vsync: %u, upper: %u, lower: %u\n",
 653                 vmode->xres, vmode->yres, vmode->hsync_len, vmode->left_margin,
 654                 vmode->right_margin, vmode->vsync_len, vmode->upper_margin,
 655                 vmode->lower_margin);
 656         pr_debug("pixclk: %ldkHz\n", PICOS2KHZ(vmode->pixclock));
 657
 658         host->ld_intf_width = CTRL_GET_BUS_WIDTH(ctrl);
 659         host->dotclk_delay = VDCTRL4_GET_DOTCLK_DLY(vdctrl4);
 660
 661         fb_info->fix.line_length = vmode->xres * (bits_per_pixel >> 3);
 662
 663         pa = readl(host->base + host->devdata->cur_buf);
 664         fbsize = fb_info->fix.line_length * vmode->yres;
 665         if (pa < fb_info->fix.smem_start)
 666                 return -EINVAL;
 667         if (pa + fbsize > fb_info->fix.smem_start + fb_info->fix.smem_len)
 668                 return -EINVAL;
 669         ofs = pa - fb_info->fix.smem_start;
 670         if (ofs) {
 671                 memmove(fb_info->screen_base, fb_info->screen_base + ofs, fbsize);
 672                 writel(fb_info->fix.smem_start, host->base + host->devdata->next_buf);
 673         }
 674
 675         line_count = fb_info->fix.smem_len / fb_info->fix.line_length;
 676         fb_info->fix.ypanstep = 1;
 677
 678         clk_prepare_enable(host->clk);
 679         host->enabled = 1;
 680
 681         return 0;
 682 }
 683
 684 static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host,
 685                                 struct fb_videomode *vmode)
 686 {
 687         struct fb_info *fb_info = &host->fb_info;
 688         struct fb_var_screeninfo *var = &fb_info->var;
 689         struct device *dev = &host->pdev->dev;
 690         struct device_node *np = host->pdev->dev.of_node;
 691         struct device_node *display_np;
 692         struct videomode vm;
 693         u32 width;
 694         int ret;
 695
 696         display_np = of_parse_phandle(np, "display", 0);
 697         if (!display_np) {
 698                 dev_err(dev, "failed to find display phandle\n");
 699                 return -ENOENT;
 700         }
 701
 702         ret = of_property_read_u32(display_np, "bus-width", &width);
 703         if (ret < 0) {
 704                 dev_err(dev, "failed to get property bus-width\n");
 705                 goto put_display_node;
 706         }
 707
 708         switch (width) {
 709         case 8:
 710                 host->ld_intf_width = STMLCDIF_8BIT;
 711                 break;
 712         case 16:
 713                 host->ld_intf_width = STMLCDIF_16BIT;
 714                 break;
 715         case 18:
 716                 host->ld_intf_width = STMLCDIF_18BIT;
 717                 break;
 718         case 24:
 719                 host->ld_intf_width = STMLCDIF_24BIT;
 720                 break;
 721         default:
 722                 dev_err(dev, "invalid bus-width value\n");
 723                 ret = -EINVAL;
 724                 goto put_display_node;
 725         }
 726
 727         ret = of_property_read_u32(display_np, "bits-per-pixel",
 728                                    &var->bits_per_pixel);
 729         if (ret < 0) {
 730                 dev_err(dev, "failed to get property bits-per-pixel\n");
 731                 goto put_display_node;
 732         }
 733
 734         ret = of_get_videomode(display_np, &vm, OF_USE_NATIVE_MODE);
 735         if (ret) {
 736                 dev_err(dev, "failed to get videomode from DT\n");
 737                 goto put_display_node;
 738         }
 739
 740         ret = fb_videomode_from_videomode(&vm, vmode);
 741         if (ret < 0)
 742                 goto put_display_node;
 743
 744         if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
 745                 host->sync |= MXSFB_SYNC_DATA_ENABLE_HIGH_ACT;
 746         if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
 747                 host->sync |= MXSFB_SYNC_DOTCLK_FALLING_ACT;
 748
 749 put_display_node:
 750         of_node_put(display_np);
 751         return ret;
 752 }
 753
 754 static int mxsfb_init_fbinfo(struct mxsfb_info *host,
 755                         struct fb_videomode *vmode)
 756 {
 757         int ret;
 758         struct fb_info *fb_info = &host->fb_info;
 759         struct fb_var_screeninfo *var = &fb_info->var;
 760         dma_addr_t fb_phys;
 761         void *fb_virt;
 762         unsigned fb_size;
 763
 764         fb_info->fbops = &mxsfb_ops;
 765         fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST;
 766         strlcpy(fb_info->fix.id, "mxs", sizeof(fb_info->fix.id));
 767         fb_info->fix.type = FB_TYPE_PACKED_PIXELS;
 768         fb_info->fix.ypanstep = 1;
 769         fb_info->fix.visual = FB_VISUAL_TRUECOLOR,
 770         fb_info->fix.accel = FB_ACCEL_NONE;
 771
 772         ret = mxsfb_init_fbinfo_dt(host, vmode);
 773         if (ret)
 774                 return ret;
 775
 776         var->nonstd = 0;
 777         var->activate = FB_ACTIVATE_NOW;
 778         var->accel_flags = 0;
 779         var->vmode = FB_VMODE_NONINTERLACED;
 780
 781         /* Memory allocation for framebuffer */
 782         fb_size = SZ_2M;
 783         fb_virt = alloc_pages_exact(fb_size, GFP_DMA);
 784         if (!fb_virt)
 785                 return -ENOMEM;
 786
 787         fb_phys = virt_to_phys(fb_virt);
 788
 789         fb_info->fix.smem_start = fb_phys;
 790         fb_info->screen_base = fb_virt;
 791         fb_info->screen_size = fb_info->fix.smem_len = fb_size;
 792
 793         if (mxsfb_restore_mode(host, vmode))
 794                 memset(fb_virt, 0, fb_size);
 795
 796         return 0;
 797 }
 798
 799 static void mxsfb_free_videomem(struct mxsfb_info *host)
 800 {
 801         struct fb_info *fb_info = &host->fb_info;
 802
 803         free_pages_exact(fb_info->screen_base, fb_info->fix.smem_len);
 804 }
 805
 806 static struct platform_device_id mxsfb_devtype[] = {
 807         {
 808                 .name = "imx23-fb",
 809                 .driver_data = MXSFB_V3,
 810         }, {
 811                 .name = "imx28-fb",
 812                 .driver_data = MXSFB_V4,
 813         }, {
 814                 /* sentinel */
 815         }
 816 };
 817 MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
 818
 819 static const struct of_device_id mxsfb_dt_ids[] = {
 820         { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
 821         { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
 822         { /* sentinel */ }
 823 };
 824 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
 825
 826 static int mxsfb_probe(struct platform_device *pdev)
 827 {
 828         const struct of_device_id *of_id =
 829                         of_match_device(mxsfb_dt_ids, &pdev->dev);
 830         struct resource *res;
 831         struct mxsfb_info *host;
 832         struct fb_info *fb_info;
 833         struct fb_videomode *mode;
 834         int ret;
 835
 836         if (of_id)
 837                 pdev->id_entry = of_id->data;
 838
 839         fb_info = framebuffer_alloc(sizeof(struct mxsfb_info), &pdev->dev);
 840         if (!fb_info) {
 841                 dev_err(&pdev->dev, "Failed to allocate fbdev\n");
 842                 return -ENOMEM;
 843         }
 844
 845         mode = devm_kzalloc(&pdev->dev, sizeof(struct fb_videomode),
 846                         GFP_KERNEL);
 847         if (mode == NULL)
 848                 return -ENOMEM;
 849
 850         host = to_imxfb_host(fb_info);
 851
 852         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 853         host->base = devm_ioremap_resource(&pdev->dev, res);
 854         if (IS_ERR(host->base)) {
 855                 ret = PTR_ERR(host->base);
 856                 goto fb_release;
 857         }
 858
 859         host->pdev = pdev;
 860         platform_set_drvdata(pdev, host);
 861
 862         host->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
 863
 864         host->clk = devm_clk_get(&host->pdev->dev, NULL);
 865         if (IS_ERR(host->clk)) {
 866                 ret = PTR_ERR(host->clk);
 867                 goto fb_release;
 868         }
 869
 870         host->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
 871         if (IS_ERR(host->reg_lcd))
 872                 host->reg_lcd = NULL;
 873
 874         fb_info->pseudo_palette = devm_kzalloc(&pdev->dev, sizeof(u32) * 16,
 875                                                GFP_KERNEL);
 876         if (!fb_info->pseudo_palette) {
 877                 ret = -ENOMEM;
 878                 goto fb_release;
 879         }
 880
 881         ret = mxsfb_init_fbinfo(host, mode);
 882         if (ret != 0)
 883                 goto fb_release;
 884
 885         fb_videomode_to_var(&fb_info->var, mode);
 886
 887         /* init the color fields */
 888         mxsfb_check_var(&fb_info->var, fb_info);
 889
 890         platform_set_drvdata(pdev, fb_info);
 891
 892         ret = register_framebuffer(fb_info);
 893         if (ret != 0) {
 894                 dev_err(&pdev->dev,"Failed to register framebuffer\n");
 895                 goto fb_destroy;
 896         }
 897
 898         if (!host->enabled) {
 899                 writel(0, host->base + LCDC_CTRL);
 900                 mxsfb_set_par(fb_info);
 901                 mxsfb_enable_controller(fb_info);
 902         }
 903
 904         dev_info(&pdev->dev, "initialized\n");
 905
 906         return 0;
 907
 908 fb_destroy:
 909         if (host->enabled)
 910                 clk_disable_unprepare(host->clk);
 911 fb_release:
 912         framebuffer_release(fb_info);
 913
 914         return ret;
 915 }
 916
 917 static int mxsfb_remove(struct platform_device *pdev)
 918 {
 919         struct fb_info *fb_info = platform_get_drvdata(pdev);
 920         struct mxsfb_info *host = to_imxfb_host(fb_info);
 921
 922         if (host->enabled)
 923                 mxsfb_disable_controller(fb_info);
 924
 925         unregister_framebuffer(fb_info);
 926         mxsfb_free_videomem(host);
 927
 928         framebuffer_release(fb_info);
 929
 930         return 0;
 931 }
 932
 933 static void mxsfb_shutdown(struct platform_device *pdev)
 934 {
 935         struct fb_info *fb_info = platform_get_drvdata(pdev);
 936         struct mxsfb_info *host = to_imxfb_host(fb_info);
 937
 938         /*
 939          * Force stop the LCD controller as keeping it running during reboot
 940          * might interfere with the BootROM's boot mode pads sampling.
 941          */
 942         writel(CTRL_RUN, host->base + LCDC_CTRL + REG_CLR);
 943 }
 944
 945 static struct platform_driver mxsfb_driver = {
 946         .probe = mxsfb_probe,
 947         .remove = mxsfb_remove,
 948         .shutdown = mxsfb_shutdown,
 949         .id_table = mxsfb_devtype,
 950         .driver = {
 951                    .name = DRIVER_NAME,
 952                    .of_match_table = mxsfb_dt_ids,
 953         },
 954 };
 955
 956 module_platform_driver(mxsfb_driver);
 957
 958 MODULE_DESCRIPTION("Freescale mxs framebuffer driver");
 959 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 960 MODULE_LICENSE("GPL");