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/of_gpio.h>
  46 #include <linux/platform_device.h>
  47 #include <linux/clk.h>
  48 #include <linux/dma-mapping.h>
  49 #include <linux/io.h>
  50 #include <linux/pinctrl/consumer.h>
  51 #include <linux/mxsfb.h>
  52
  53 #define REG_SET 4
  54 #define REG_CLR 8
  55
  56 #define LCDC_CTRL                       0x00
  57 #define LCDC_CTRL1                      0x10
  58 #define LCDC_V4_CTRL2                   0x20
  59 #define LCDC_V3_TRANSFER_COUNT          0x20
  60 #define LCDC_V4_TRANSFER_COUNT          0x30
  61 #define LCDC_V4_CUR_BUF                 0x40
  62 #define LCDC_V4_NEXT_BUF                0x50
  63 #define LCDC_V3_CUR_BUF                 0x30
  64 #define LCDC_V3_NEXT_BUF                0x40
  65 #define LCDC_TIMING                     0x60
  66 #define LCDC_VDCTRL0                    0x70
  67 #define LCDC_VDCTRL1                    0x80
  68 #define LCDC_VDCTRL2                    0x90
  69 #define LCDC_VDCTRL3                    0xa0
  70 #define LCDC_VDCTRL4                    0xb0
  71 #define LCDC_DVICTRL0                   0xc0
  72 #define LCDC_DVICTRL1                   0xd0
  73 #define LCDC_DVICTRL2                   0xe0
  74 #define LCDC_DVICTRL3                   0xf0
  75 #define LCDC_DVICTRL4                   0x100
  76 #define LCDC_V4_DATA                    0x180
  77 #define LCDC_V3_DATA                    0x1b0
  78 #define LCDC_V4_DEBUG0                  0x1d0
  79 #define LCDC_V3_DEBUG0                  0x1f0
  80
  81 #define CTRL_SFTRST                     (1 << 31)
  82 #define CTRL_CLKGATE                    (1 << 30)
  83 #define CTRL_BYPASS_COUNT               (1 << 19)
  84 #define CTRL_VSYNC_MODE                 (1 << 18)
  85 #define CTRL_DOTCLK_MODE                (1 << 17)
  86 #define CTRL_DATA_SELECT                (1 << 16)
  87 #define CTRL_SET_BUS_WIDTH(x)           (((x) & 0x3) << 10)
  88 #define CTRL_GET_BUS_WIDTH(x)           (((x) >> 10) & 0x3)
  89 #define CTRL_SET_WORD_LENGTH(x)         (((x) & 0x3) << 8)
  90 #define CTRL_GET_WORD_LENGTH(x)         (((x) >> 8) & 0x3)
  91 #define CTRL_MASTER                     (1 << 5)
  92 #define CTRL_DF16                       (1 << 3)
  93 #define CTRL_DF18                       (1 << 2)
  94 #define CTRL_DF24                       (1 << 1)
  95 #define CTRL_RUN                        (1 << 0)
  96
  97 #define CTRL1_FIFO_CLEAR                (1 << 21)
  98 #define CTRL1_SET_BYTE_PACKAGING(x)     (((x) & 0xf) << 16)
  99 #define CTRL1_GET_BYTE_PACKAGING(x)     (((x) >> 16) & 0xf)
 100
 101 #define TRANSFER_COUNT_SET_VCOUNT(x)    (((x) & 0xffff) << 16)
 102 #define TRANSFER_COUNT_GET_VCOUNT(x)    (((x) >> 16) & 0xffff)
 103 #define TRANSFER_COUNT_SET_HCOUNT(x)    ((x) & 0xffff)
 104 #define TRANSFER_COUNT_GET_HCOUNT(x)    ((x) & 0xffff)
 105
 106
 107 #define VDCTRL0_ENABLE_PRESENT          (1 << 28)
 108 #define VDCTRL0_VSYNC_ACT_HIGH          (1 << 27)
 109 #define VDCTRL0_HSYNC_ACT_HIGH          (1 << 26)
 110 #define VDCTRL0_DOTCLK_ACT_FAILING      (1 << 25)
 111 #define VDCTRL0_ENABLE_ACT_HIGH         (1 << 24)
 112 #define VDCTRL0_VSYNC_PERIOD_UNIT       (1 << 21)
 113 #define VDCTRL0_VSYNC_PULSE_WIDTH_UNIT  (1 << 20)
 114 #define VDCTRL0_HALF_LINE               (1 << 19)
 115 #define VDCTRL0_HALF_LINE_MODE          (1 << 18)
 116 #define VDCTRL0_SET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
 117 #define VDCTRL0_GET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
 118
 119 #define VDCTRL2_SET_HSYNC_PERIOD(x)     ((x) & 0x3ffff)
 120 #define VDCTRL2_GET_HSYNC_PERIOD(x)     ((x) & 0x3ffff)
 121
 122 #define VDCTRL3_MUX_SYNC_SIGNALS        (1 << 29)
 123 #define VDCTRL3_VSYNC_ONLY              (1 << 28)
 124 #define SET_HOR_WAIT_CNT(x)             (((x) & 0xfff) << 16)
 125 #define GET_HOR_WAIT_CNT(x)             (((x) >> 16) & 0xfff)
 126 #define SET_VERT_WAIT_CNT(x)            ((x) & 0xffff)
 127 #define GET_VERT_WAIT_CNT(x)            ((x) & 0xffff)
 128
 129 #define VDCTRL4_SET_DOTCLK_DLY(x)       (((x) & 0x7) << 29) /* v4 only */
 130 #define VDCTRL4_GET_DOTCLK_DLY(x)       (((x) >> 29) & 0x7) /* v4 only */
 131 #define VDCTRL4_SYNC_SIGNALS_ON         (1 << 18)
 132 #define SET_DOTCLK_H_VALID_DATA_CNT(x)  ((x) & 0x3ffff)
 133
 134 #define DEBUG0_HSYNC                    (1 < 26)
 135 #define DEBUG0_VSYNC                    (1 < 25)
 136
 137 #define MIN_XRES                        120
 138 #define MIN_YRES                        120
 139
 140 #define RED 0
 141 #define GREEN 1
 142 #define BLUE 2
 143 #define TRANSP 3
 144
 145 enum mxsfb_devtype {
 146         MXSFB_V3,
 147         MXSFB_V4,
 148 };
 149
 150 /* CPU dependent register offsets */
 151 struct mxsfb_devdata {
 152         unsigned transfer_count;
 153         unsigned cur_buf;
 154         unsigned next_buf;
 155         unsigned debug0;
 156         unsigned hs_wdth_mask;
 157         unsigned hs_wdth_shift;
 158         unsigned ipversion;
 159 };
 160
 161 struct mxsfb_info {
 162         struct fb_info fb_info;
 163         struct platform_device *pdev;
 164         struct clk *clk;
 165         void __iomem *base;     /* registers */
 166         unsigned allocated_size;
 167         int enabled;
 168         unsigned ld_intf_width;
 169         unsigned dotclk_delay;
 170         const struct mxsfb_devdata *devdata;
 171         int mapped;
 172 };
 173
 174 #define mxsfb_is_v3(host) (host->devdata->ipversion == 3)
 175 #define mxsfb_is_v4(host) (host->devdata->ipversion == 4)
 176
 177 static const struct mxsfb_devdata mxsfb_devdata[] = {
 178         [MXSFB_V3] = {
 179                 .transfer_count = LCDC_V3_TRANSFER_COUNT,
 180                 .cur_buf = LCDC_V3_CUR_BUF,
 181                 .next_buf = LCDC_V3_NEXT_BUF,
 182                 .debug0 = LCDC_V3_DEBUG0,
 183                 .hs_wdth_mask = 0xff,
 184                 .hs_wdth_shift = 24,
 185                 .ipversion = 3,
 186         },
 187         [MXSFB_V4] = {
 188                 .transfer_count = LCDC_V4_TRANSFER_COUNT,
 189                 .cur_buf = LCDC_V4_CUR_BUF,
 190                 .next_buf = LCDC_V4_NEXT_BUF,
 191                 .debug0 = LCDC_V4_DEBUG0,
 192                 .hs_wdth_mask = 0x3fff,
 193                 .hs_wdth_shift = 18,
 194                 .ipversion = 4,
 195         },
 196 };
 197
 198 #define to_imxfb_host(x) (container_of(x, struct mxsfb_info, fb_info))
 199
 200 /* mask and shift depends on architecture */
 201 static inline u32 set_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
 202 {
 203         return (val & host->devdata->hs_wdth_mask) <<
 204                 host->devdata->hs_wdth_shift;
 205 }
 206
 207 static inline u32 get_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
 208 {
 209         return (val >> host->devdata->hs_wdth_shift) &
 210                 host->devdata->hs_wdth_mask;
 211 }
 212
 213 static const struct fb_bitfield def_rgb565[] = {
 214         [RED] = {
 215                 .offset = 11,
 216                 .length = 5,
 217         },
 218         [GREEN] = {
 219                 .offset = 5,
 220                 .length = 6,
 221         },
 222         [BLUE] = {
 223                 .offset = 0,
 224                 .length = 5,
 225         },
 226         [TRANSP] = {    /* no support for transparency */
 227                 .length = 0,
 228         }
 229 };
 230
 231 static const struct fb_bitfield def_rgb666[] = {
 232         [RED] = {
 233                 .offset = 16,
 234                 .length = 6,
 235         },
 236         [GREEN] = {
 237                 .offset = 8,
 238                 .length = 6,
 239         },
 240         [BLUE] = {
 241                 .offset = 0,
 242                 .length = 6,
 243         },
 244         [TRANSP] = {    /* no support for transparency */
 245                 .length = 0,
 246         }
 247 };
 248
 249 static const struct fb_bitfield def_rgb888[] = {
 250         [RED] = {
 251                 .offset = 16,
 252                 .length = 8,
 253         },
 254         [GREEN] = {
 255                 .offset = 8,
 256                 .length = 8,
 257         },
 258         [BLUE] = {
 259                 .offset = 0,
 260                 .length = 8,
 261         },
 262         [TRANSP] = {    /* no support for transparency */
 263                 .length = 0,
 264         }
 265 };
 266
 267 static inline unsigned chan_to_field(unsigned chan, struct fb_bitfield *bf)
 268 {
 269         chan &= 0xffff;
 270         chan >>= 16 - bf->length;
 271         return chan << bf->offset;
 272 }
 273
 274 static int mxsfb_check_var(struct fb_var_screeninfo *var,
 275                 struct fb_info *fb_info)
 276 {
 277         struct mxsfb_info *host = to_imxfb_host(fb_info);
 278         const struct fb_bitfield *rgb = NULL;
 279
 280         if (var->xres < MIN_XRES)
 281                 var->xres = MIN_XRES;
 282         if (var->yres < MIN_YRES)
 283                 var->yres = MIN_YRES;
 284
 285         var->xres_virtual = var->xres;
 286
 287         var->yres_virtual = var->yres;
 288
 289         switch (var->bits_per_pixel) {
 290         case 16:
 291                 /* always expect RGB 565 */
 292                 rgb = def_rgb565;
 293                 break;
 294         case 32:
 295                 switch (host->ld_intf_width) {
 296                 case STMLCDIF_8BIT:
 297                         pr_debug("Unsupported LCD bus width mapping\n");
 298                         break;
 299                 case STMLCDIF_16BIT:
 300                 case STMLCDIF_18BIT:
 301                         /* 24 bit to 18 bit mapping */
 302                         rgb = def_rgb666;
 303                         break;
 304                 case STMLCDIF_24BIT:
 305                         /* real 24 bit */
 306                         rgb = def_rgb888;
 307                         break;
 308                 }
 309                 break;
 310         default:
 311                 pr_debug("Unsupported colour depth: %u\n", var->bits_per_pixel);
 312                 return -EINVAL;
 313         }
 314
 315         /*
 316          * Copy the RGB parameters for this display
 317          * from the machine specific parameters.
 318          */
 319         var->red    = rgb[RED];
 320         var->green  = rgb[GREEN];
 321         var->blue   = rgb[BLUE];
 322         var->transp = rgb[TRANSP];
 323
 324         return 0;
 325 }
 326
 327 static void mxsfb_enable_controller(struct fb_info *fb_info)
 328 {
 329         struct mxsfb_info *host = to_imxfb_host(fb_info);
 330         u32 reg;
 331
 332         dev_dbg(&host->pdev->dev, "%s\n", __func__);
 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
 356         dev_dbg(&host->pdev->dev, "%s\n", __func__);
 357
 358         /*
 359          * Even if we disable the controller here, it will still continue
 360          * until its FIFOs are running out of data
 361          */
 362         writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_CLR);
 363
 364         loop = 1000;
 365         while (loop) {
 366                 reg = readl(host->base + LCDC_CTRL);
 367                 if (!(reg & CTRL_RUN))
 368                         break;
 369                 loop--;
 370         }
 371
 372         writel(VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4 + REG_CLR);
 373
 374         clk_disable_unprepare(host->clk);
 375
 376         host->enabled = 0;
 377 }
 378
 379 static int mxsfb_set_par(struct fb_info *fb_info)
 380 {
 381         struct mxsfb_info *host = to_imxfb_host(fb_info);
 382         u32 ctrl, vdctrl0, vdctrl4;
 383         int line_size, fb_size;
 384         int reenable = 0;
 385
 386         line_size =  fb_info->var.xres * (fb_info->var.bits_per_pixel >> 3);
 387         fb_size = fb_info->var.yres_virtual * line_size;
 388
 389         if (fb_size > fb_info->fix.smem_len)
 390                 return -ENOMEM;
 391
 392         fb_info->fix.line_length = line_size;
 393
 394         /*
 395          * It seems, you can't re-program the controller if it is still running.
 396          * This may lead into shifted pictures (FIFO issue?).
 397          * So, first stop the controller and drain its FIFOs
 398          */
 399         if (host->enabled) {
 400                 reenable = 1;
 401                 mxsfb_disable_controller(fb_info);
 402         }
 403
 404         /* clear the FIFOs */
 405         writel(CTRL1_FIFO_CLEAR, host->base + LCDC_CTRL1 + REG_SET);
 406
 407         ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER |
 408                 CTRL_SET_BUS_WIDTH(host->ld_intf_width);
 409
 410         switch (fb_info->var.bits_per_pixel) {
 411         case 16:
 412                 dev_dbg(&host->pdev->dev, "Setting up RGB565 mode\n");
 413                 ctrl |= CTRL_SET_WORD_LENGTH(0);
 414                 writel(CTRL1_SET_BYTE_PACKAGING(0xf), host->base + LCDC_CTRL1);
 415                 break;
 416         case 32:
 417                 dev_dbg(&host->pdev->dev, "Setting up RGB888/666 mode\n");
 418                 ctrl |= CTRL_SET_WORD_LENGTH(3);
 419                 switch (host->ld_intf_width) {
 420                 case STMLCDIF_8BIT:
 421                         dev_dbg(&host->pdev->dev,
 422                                         "Unsupported LCD bus width mapping\n");
 423                         return -EINVAL;
 424                 case STMLCDIF_16BIT:
 425                 case STMLCDIF_18BIT:
 426                         /* 24 bit to 18 bit mapping */
 427                         ctrl |= CTRL_DF24; /* ignore the upper 2 bits in
 428                                             *  each colour component
 429                                             */
 430                         break;
 431                 case STMLCDIF_24BIT:
 432                         /* real 24 bit */
 433                         break;
 434                 }
 435                 /* do not use packed pixels = one pixel per word instead */
 436                 writel(CTRL1_SET_BYTE_PACKAGING(0x7), host->base + LCDC_CTRL1);
 437                 break;
 438         default:
 439                 dev_dbg(&host->pdev->dev, "Unhandled color depth of %u\n",
 440                                 fb_info->var.bits_per_pixel);
 441                 return -EINVAL;
 442         }
 443
 444         writel(ctrl, host->base + LCDC_CTRL);
 445
 446         writel(TRANSFER_COUNT_SET_VCOUNT(fb_info->var.yres) |
 447                         TRANSFER_COUNT_SET_HCOUNT(fb_info->var.xres),
 448                         host->base + host->devdata->transfer_count);
 449
 450         vdctrl0 = VDCTRL0_ENABLE_PRESENT |      /* always in DOTCLOCK mode */
 451                 VDCTRL0_VSYNC_PERIOD_UNIT |
 452                 VDCTRL0_VSYNC_PULSE_WIDTH_UNIT |
 453                 VDCTRL0_SET_VSYNC_PULSE_WIDTH(fb_info->var.vsync_len);
 454         if (fb_info->var.sync & FB_SYNC_HOR_HIGH_ACT)
 455                 vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH;
 456         if (fb_info->var.sync & FB_SYNC_VERT_HIGH_ACT)
 457                 vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH;
 458         if (fb_info->var.sync & FB_SYNC_DATA_ENABLE_HIGH_ACT)
 459                 vdctrl0 |= VDCTRL0_ENABLE_ACT_HIGH;
 460         if (fb_info->var.sync & FB_SYNC_DOTCLK_FAILING_ACT)
 461                 vdctrl0 |= VDCTRL0_DOTCLK_ACT_FAILING;
 462
 463         writel(vdctrl0, host->base + LCDC_VDCTRL0);
 464
 465         /* frame length in lines */
 466         writel(fb_info->var.upper_margin + fb_info->var.vsync_len +
 467                 fb_info->var.lower_margin + fb_info->var.yres,
 468                 host->base + LCDC_VDCTRL1);
 469
 470         /* line length in units of clocks or pixels */
 471         writel(set_hsync_pulse_width(host, fb_info->var.hsync_len) |
 472                 VDCTRL2_SET_HSYNC_PERIOD(fb_info->var.left_margin +
 473                 fb_info->var.hsync_len + fb_info->var.right_margin +
 474                 fb_info->var.xres),
 475                 host->base + LCDC_VDCTRL2);
 476
 477         writel(SET_HOR_WAIT_CNT(fb_info->var.left_margin +
 478                 fb_info->var.hsync_len) |
 479                 SET_VERT_WAIT_CNT(fb_info->var.upper_margin +
 480                         fb_info->var.vsync_len),
 481                 host->base + LCDC_VDCTRL3);
 482
 483         vdctrl4 = SET_DOTCLK_H_VALID_DATA_CNT(fb_info->var.xres);
 484         if (mxsfb_is_v4(host))
 485                 vdctrl4 |= VDCTRL4_SET_DOTCLK_DLY(host->dotclk_delay);
 486         writel(vdctrl4, host->base + LCDC_VDCTRL4);
 487
 488         writel(fb_info->fix.smem_start +
 489                         fb_info->fix.line_length * fb_info->var.yoffset,
 490                         host->base + host->devdata->next_buf);
 491
 492         if (reenable)
 493                 mxsfb_enable_controller(fb_info);
 494
 495         return 0;
 496 }
 497
 498 static int mxsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 499                 u_int transp, struct fb_info *fb_info)
 500 {
 501         unsigned int val;
 502         int ret = -EINVAL;
 503
 504         /*
 505          * If greyscale is true, then we convert the RGB value
 506          * to greyscale no matter what visual we are using.
 507          */
 508         if (fb_info->var.grayscale)
 509                 red = green = blue = (19595 * red + 38470 * green +
 510                                         7471 * blue) >> 16;
 511
 512         switch (fb_info->fix.visual) {
 513         case FB_VISUAL_TRUECOLOR:
 514                 /*
 515                  * 12 or 16-bit True Colour.  We encode the RGB value
 516                  * according to the RGB bitfield information.
 517                  */
 518                 if (regno < 16) {
 519                         u32 *pal = fb_info->pseudo_palette;
 520
 521                         val  = chan_to_field(red, &fb_info->var.red);
 522                         val |= chan_to_field(green, &fb_info->var.green);
 523                         val |= chan_to_field(blue, &fb_info->var.blue);
 524
 525                         pal[regno] = val;
 526                         ret = 0;
 527                 }
 528                 break;
 529
 530         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 531         case FB_VISUAL_PSEUDOCOLOR:
 532                 break;
 533         }
 534
 535         return ret;
 536 }
 537
 538 static int mxsfb_blank(int blank, struct fb_info *fb_info)
 539 {
 540         struct mxsfb_info *host = to_imxfb_host(fb_info);
 541
 542         switch (blank) {
 543         case FB_BLANK_POWERDOWN:
 544         case FB_BLANK_VSYNC_SUSPEND:
 545         case FB_BLANK_HSYNC_SUSPEND:
 546         case FB_BLANK_NORMAL:
 547                 if (host->enabled)
 548                         mxsfb_disable_controller(fb_info);
 549                 break;
 550
 551         case FB_BLANK_UNBLANK:
 552                 if (!host->enabled)
 553                         mxsfb_enable_controller(fb_info);
 554                 break;
 555         }
 556         return 0;
 557 }
 558
 559 static int mxsfb_pan_display(struct fb_var_screeninfo *var,
 560                 struct fb_info *fb_info)
 561 {
 562         struct mxsfb_info *host = to_imxfb_host(fb_info);
 563         unsigned offset;
 564
 565         if (var->xoffset != 0)
 566                 return -EINVAL;
 567
 568         offset = fb_info->fix.line_length * var->yoffset;
 569
 570         /* update on next VSYNC */
 571         writel(fb_info->fix.smem_start + offset,
 572                         host->base + host->devdata->next_buf);
 573
 574         return 0;
 575 }
 576
 577 static struct fb_ops mxsfb_ops = {
 578         .owner = THIS_MODULE,
 579         .fb_check_var = mxsfb_check_var,
 580         .fb_set_par = mxsfb_set_par,
 581         .fb_setcolreg = mxsfb_setcolreg,
 582         .fb_blank = mxsfb_blank,
 583         .fb_pan_display = mxsfb_pan_display,
 584         .fb_fillrect = cfb_fillrect,
 585         .fb_copyarea = cfb_copyarea,
 586         .fb_imageblit = cfb_imageblit,
 587 };
 588
 589 static int __devinit mxsfb_restore_mode(struct mxsfb_info *host)
 590 {
 591         struct fb_info *fb_info = &host->fb_info;
 592         unsigned line_count;
 593         unsigned period;
 594         unsigned long pa, fbsize;
 595         int bits_per_pixel, ofs;
 596         u32 transfer_count, vdctrl0, vdctrl2, vdctrl3, vdctrl4, ctrl;
 597         struct fb_videomode vmode;
 598
 599         /* Only restore the mode when the controller is running */
 600         ctrl = readl(host->base + LCDC_CTRL);
 601         if (!(ctrl & CTRL_RUN))
 602                 return -EINVAL;
 603
 604         vdctrl0 = readl(host->base + LCDC_VDCTRL0);
 605         vdctrl2 = readl(host->base + LCDC_VDCTRL2);
 606         vdctrl3 = readl(host->base + LCDC_VDCTRL3);
 607         vdctrl4 = readl(host->base + LCDC_VDCTRL4);
 608
 609         transfer_count = readl(host->base + host->devdata->transfer_count);
 610
 611         vmode.xres = TRANSFER_COUNT_GET_HCOUNT(transfer_count);
 612         vmode.yres = TRANSFER_COUNT_GET_VCOUNT(transfer_count);
 613
 614         switch (CTRL_GET_WORD_LENGTH(ctrl)) {
 615         case 0:
 616                 bits_per_pixel = 16;
 617                 break;
 618         case 3:
 619                 bits_per_pixel = 32;
 620         case 1:
 621         default:
 622                 return -EINVAL;
 623         }
 624
 625         fb_info->var.bits_per_pixel = bits_per_pixel;
 626
 627         vmode.pixclock = KHZ2PICOS(clk_get_rate(host->clk) / 1000U);
 628         vmode.hsync_len = get_hsync_pulse_width(host, vdctrl2);
 629         vmode.left_margin = GET_HOR_WAIT_CNT(vdctrl3) - vmode.hsync_len;
 630         vmode.right_margin = VDCTRL2_GET_HSYNC_PERIOD(vdctrl2) - vmode.hsync_len -
 631                 vmode.left_margin - vmode.xres;
 632         vmode.vsync_len = VDCTRL0_GET_VSYNC_PULSE_WIDTH(vdctrl0);
 633         period = readl(host->base + LCDC_VDCTRL1);
 634         vmode.upper_margin = GET_VERT_WAIT_CNT(vdctrl3) - vmode.vsync_len;
 635         vmode.lower_margin = period - vmode.vsync_len - vmode.upper_margin - vmode.yres;
 636
 637         vmode.vmode = FB_VMODE_NONINTERLACED;
 638
 639         vmode.sync = 0;
 640         if (vdctrl0 & VDCTRL0_HSYNC_ACT_HIGH)
 641                 vmode.sync |= FB_SYNC_HOR_HIGH_ACT;
 642         if (vdctrl0 & VDCTRL0_VSYNC_ACT_HIGH)
 643                 vmode.sync |= FB_SYNC_VERT_HIGH_ACT;
 644
 645         pr_debug("Reconstructed video mode:\n");
 646         pr_debug("%dx%d, hsync: %u left: %u, right: %u, vsync: %u, upper: %u, lower: %u\n",
 647                         vmode.xres, vmode.yres,
 648                         vmode.hsync_len, vmode.left_margin, vmode.right_margin,
 649                         vmode.vsync_len, vmode.upper_margin, vmode.lower_margin);
 650         pr_debug("pixclk: %ldkHz\n", PICOS2KHZ(vmode.pixclock));
 651
 652         fb_add_videomode(&vmode, &fb_info->modelist);
 653
 654         host->ld_intf_width = CTRL_GET_BUS_WIDTH(ctrl);
 655         host->dotclk_delay = VDCTRL4_GET_DOTCLK_DLY(vdctrl4);
 656
 657         fb_info->fix.line_length = vmode.xres * (bits_per_pixel >> 3);
 658
 659         pa = readl(host->base + host->devdata->cur_buf);
 660         fbsize = fb_info->fix.line_length * vmode.yres;
 661         if (pa < fb_info->fix.smem_start)
 662                 return -EINVAL;
 663         if (pa + fbsize > fb_info->fix.smem_start + fb_info->fix.smem_len)
 664                 return -EINVAL;
 665         ofs = pa - fb_info->fix.smem_start;
 666         if (ofs) {
 667                 memmove(fb_info->screen_base, fb_info->screen_base + ofs, fbsize);
 668                 writel(fb_info->fix.smem_start, host->base + host->devdata->next_buf);
 669         }
 670
 671         line_count = fb_info->fix.smem_len / fb_info->fix.line_length;
 672         fb_info->fix.ypanstep = 1;
 673
 674         clk_prepare_enable(host->clk);
 675         host->enabled = 1;
 676
 677         return 0;
 678 }
 679
 680 static int __devinit mxsfb_init_fbinfo(struct mxsfb_info *host)
 681 {
 682         struct fb_info *fb_info = &host->fb_info;
 683         struct fb_var_screeninfo *var = &fb_info->var;
 684         struct mxsfb_platform_data *pdata = host->pdev->dev.platform_data;
 685         dma_addr_t fb_phys;
 686         void *fb_virt;
 687         unsigned fb_size = pdata->fb_size;
 688
 689         fb_info->fbops = &mxsfb_ops;
 690         fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST;
 691         strlcpy(fb_info->fix.id, "mxs", sizeof(fb_info->fix.id));
 692         fb_info->fix.type = FB_TYPE_PACKED_PIXELS;
 693         fb_info->fix.ypanstep = 1;
 694         fb_info->fix.visual = FB_VISUAL_TRUECOLOR,
 695         fb_info->fix.accel = FB_ACCEL_NONE;
 696
 697         var->bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16;
 698         var->nonstd = 0;
 699         var->activate = FB_ACTIVATE_NOW;
 700         var->accel_flags = 0;
 701         var->vmode = FB_VMODE_NONINTERLACED;
 702
 703         host->dotclk_delay = pdata->dotclk_delay;
 704         host->ld_intf_width = pdata->ld_intf_width;
 705
 706         /* Memory allocation for framebuffer */
 707         if (pdata->fb_phys) {
 708                 if (!fb_size)
 709                         return -EINVAL;
 710
 711                 fb_phys = pdata->fb_phys;
 712
 713                 if (!request_mem_region(fb_phys, fb_size, host->pdev->name))
 714                         return -ENOMEM;
 715
 716                 fb_virt = ioremap(fb_phys, fb_size);
 717                 if (!fb_virt) {
 718                         release_mem_region(fb_phys, fb_size);
 719                         return -ENOMEM;
 720                 }
 721                 host->mapped = 1;
 722         } else {
 723                 if (!fb_size)
 724                         fb_size = SZ_2M; /* default */
 725                 fb_virt = alloc_pages_exact(fb_size, GFP_DMA);
 726                 if (!fb_virt)
 727                         return -ENOMEM;
 728
 729                 fb_phys = virt_to_phys(fb_virt);
 730         }
 731
 732         fb_info->fix.smem_start = fb_phys;
 733         fb_info->screen_base = fb_virt;
 734         fb_info->screen_size = fb_info->fix.smem_len = fb_size;
 735
 736         if (mxsfb_restore_mode(host))
 737                 memset(fb_virt, 0, fb_size);
 738
 739         return 0;
 740 }
 741
 742 static void __devexit mxsfb_free_videomem(struct mxsfb_info *host)
 743 {
 744         struct fb_info *fb_info = &host->fb_info;
 745
 746         if (host->mapped) {
 747                 iounmap(fb_info->screen_base);
 748                 release_mem_region(fb_info->fix.smem_start,
 749                                 fb_info->screen_size);
 750         } else {
 751                 free_pages_exact(fb_info->screen_base, fb_info->fix.smem_len);
 752         }
 753 }
 754
 755 static struct platform_device_id mxsfb_devtype[] = {
 756         {
 757                 .name = "imx23-fb",
 758                 .driver_data = MXSFB_V3,
 759         }, {
 760                 .name = "imx28-fb",
 761                 .driver_data = MXSFB_V4,
 762         }, {
 763                 /* sentinel */
 764         }
 765 };
 766 MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
 767
 768 static const struct of_device_id mxsfb_dt_ids[] = {
 769         { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
 770         { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
 771         { /* sentinel */ }
 772 };
 773 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
 774
 775 static int __devinit mxsfb_probe(struct platform_device *pdev)
 776 {
 777         const struct of_device_id *of_id =
 778                         of_match_device(mxsfb_dt_ids, &pdev->dev);
 779         struct mxsfb_platform_data *pdata = pdev->dev.platform_data;
 780         struct resource *res;
 781         struct mxsfb_info *host;
 782         struct fb_info *fb_info;
 783         struct fb_modelist *modelist;
 784         struct pinctrl *pinctrl;
 785         int panel_enable;
 786         enum of_gpio_flags flags;
 787         int i, ret;
 788
 789         if (of_id)
 790                 pdev->id_entry = of_id->data;
 791
 792         if (!pdata) {
 793                 dev_err(&pdev->dev, "No platformdata. Giving up\n");
 794                 return -ENODEV;
 795         }
 796
 797         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 798         if (!res) {
 799                 dev_err(&pdev->dev, "Cannot get memory IO resource\n");
 800                 return -ENODEV;
 801         }
 802
 803         if (!request_mem_region(res->start, resource_size(res), pdev->name))
 804                 return -EBUSY;
 805
 806         fb_info = framebuffer_alloc(sizeof(struct mxsfb_info), &pdev->dev);
 807         if (!fb_info) {
 808                 dev_err(&pdev->dev, "Failed to allocate fbdev\n");
 809                 ret = -ENOMEM;
 810                 goto error_alloc_info;
 811         }
 812
 813         host = to_imxfb_host(fb_info);
 814
 815         host->base = ioremap(res->start, resource_size(res));
 816         if (!host->base) {
 817                 dev_err(&pdev->dev, "ioremap failed\n");
 818                 ret = -ENOMEM;
 819                 goto error_ioremap;
 820         }
 821
 822         host->pdev = pdev;
 823         platform_set_drvdata(pdev, host);
 824
 825         host->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
 826
 827         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 828         if (IS_ERR(pinctrl)) {
 829                 ret = PTR_ERR(pinctrl);
 830                 goto error_getpin;
 831         }
 832
 833         host->clk = clk_get(&host->pdev->dev, NULL);
 834         if (IS_ERR(host->clk)) {
 835                 ret = PTR_ERR(host->clk);
 836                 goto error_getclock;
 837         }
 838
 839         panel_enable = of_get_named_gpio_flags(pdev->dev.of_node,
 840                                                "panel-enable-gpios", 0, &flags);
 841         if (gpio_is_valid(panel_enable)) {
 842                 unsigned long f = GPIOF_OUT_INIT_HIGH;
 843                 if (flags == OF_GPIO_ACTIVE_LOW)
 844                         f = GPIOF_OUT_INIT_LOW;
 845                 ret = devm_gpio_request_one(&pdev->dev, panel_enable,
 846                                             f, "panel-enable");
 847                 if (ret) {
 848                         dev_err(&pdev->dev,
 849                                 "failed to request gpio %d: %d\n",
 850                                 panel_enable, ret);
 851                         goto error_panel_enable;
 852                 }
 853         }
 854
 855         fb_info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
 856         if (!fb_info->pseudo_palette) {
 857                 ret = -ENOMEM;
 858                 goto error_pseudo_pallette;
 859         }
 860
 861         INIT_LIST_HEAD(&fb_info->modelist);
 862
 863         ret = mxsfb_init_fbinfo(host);
 864         if (ret != 0)
 865                 goto error_init_fb;
 866
 867         for (i = 0; i < pdata->mode_count; i++)
 868                 fb_add_videomode(&pdata->mode_list[i], &fb_info->modelist);
 869
 870         modelist = list_first_entry(&fb_info->modelist,
 871                         struct fb_modelist, list);
 872         fb_videomode_to_var(&fb_info->var, &modelist->mode);
 873
 874         /* init the color fields */
 875         mxsfb_check_var(&fb_info->var, fb_info);
 876
 877         platform_set_drvdata(pdev, fb_info);
 878
 879         ret = register_framebuffer(fb_info);
 880         if (ret != 0) {
 881                 dev_err(&pdev->dev,"Failed to register framebuffer\n");
 882                 goto error_register;
 883         }
 884
 885         if (!host->enabled) {
 886                 writel(0, host->base + LCDC_CTRL);
 887                 mxsfb_set_par(fb_info);
 888                 mxsfb_enable_controller(fb_info);
 889         }
 890
 891         dev_info(&pdev->dev, "initialized\n");
 892
 893         return 0;
 894
 895 error_register:
 896         if (host->enabled)
 897                 clk_disable_unprepare(host->clk);
 898         fb_destroy_modelist(&fb_info->modelist);
 899 error_init_fb:
 900         kfree(fb_info->pseudo_palette);
 901 error_pseudo_pallette:
 902 error_panel_enable:
 903         clk_put(host->clk);
 904 error_getclock:
 905 error_getpin:
 906         iounmap(host->base);
 907 error_ioremap:
 908         framebuffer_release(fb_info);
 909 error_alloc_info:
 910         release_mem_region(res->start, resource_size(res));
 911
 912         return ret;
 913 }
 914
 915 static int __devexit mxsfb_remove(struct platform_device *pdev)
 916 {
 917         struct fb_info *fb_info = platform_get_drvdata(pdev);
 918         struct mxsfb_info *host = to_imxfb_host(fb_info);
 919         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 920
 921         if (host->enabled)
 922                 mxsfb_disable_controller(fb_info);
 923
 924         unregister_framebuffer(fb_info);
 925         kfree(fb_info->pseudo_palette);
 926         mxsfb_free_videomem(host);
 927         iounmap(host->base);
 928         clk_put(host->clk);
 929
 930         framebuffer_release(fb_info);
 931         release_mem_region(res->start, resource_size(res));
 932
 933         platform_set_drvdata(pdev, NULL);
 934
 935         return 0;
 936 }
 937
 938 static void mxsfb_shutdown(struct platform_device *pdev)
 939 {
 940         struct fb_info *fb_info = platform_get_drvdata(pdev);
 941         struct mxsfb_info *host = to_imxfb_host(fb_info);
 942
 943         /*
 944          * Force stop the LCD controller as keeping it running during reboot
 945          * might interfere with the BootROM's boot mode pads sampling.
 946          */
 947         writel(CTRL_RUN, host->base + LCDC_CTRL + REG_CLR);
 948 }
 949
 950 static struct platform_driver mxsfb_driver = {
 951         .probe = mxsfb_probe,
 952         .remove = __devexit_p(mxsfb_remove),
 953         .shutdown = mxsfb_shutdown,
 954         .id_table = mxsfb_devtype,
 955         .driver = {
 956                    .name = DRIVER_NAME,
 957                    .of_match_table = mxsfb_dt_ids,
 958         },
 959 };
 960
 961 module_platform_driver(mxsfb_driver);
 962
 963 MODULE_DESCRIPTION("Freescale mxs framebuffer driver");
 964 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 965 MODULE_LICENSE("GPL");