linux/drivers/video/imxfb.c
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   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/math64.h>
  34#include <linux/of.h>
  35#include <linux/of_device.h>
  36
  37#include <video/of_display_timing.h>
  38#include <video/of_videomode.h>
  39#include <video/videomode.h>
  40
  41#include <linux/platform_data/video-imxfb.h>
  42
  43/*
  44 * Complain if VAR is out of range.
  45 */
  46#define DEBUG_VAR 1
  47
  48#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
  49        (defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE) && \
  50                defined(CONFIG_FB_IMX_MODULE))
  51#define PWMR_BACKLIGHT_AVAILABLE
  52#endif
  53
  54#define DRIVER_NAME "imx-fb"
  55
  56#define LCDC_SSA        0x00
  57
  58#define LCDC_SIZE       0x04
  59#define SIZE_XMAX(x)    ((((x) >> 4) & 0x3f) << 20)
  60
  61#define YMAX_MASK_IMX1  0x1ff
  62#define YMAX_MASK_IMX21 0x3ff
  63
  64#define LCDC_VPW        0x08
  65#define VPW_VPW(x)      ((x) & 0x3ff)
  66
  67#define LCDC_CPOS       0x0C
  68#define CPOS_CC1        (1<<31)
  69#define CPOS_CC0        (1<<30)
  70#define CPOS_OP         (1<<28)
  71#define CPOS_CXP(x)     (((x) & 3ff) << 16)
  72
  73#define LCDC_LCWHB      0x10
  74#define LCWHB_BK_EN     (1<<31)
  75#define LCWHB_CW(w)     (((w) & 0x1f) << 24)
  76#define LCWHB_CH(h)     (((h) & 0x1f) << 16)
  77#define LCWHB_BD(x)     ((x) & 0xff)
  78
  79#define LCDC_LCHCC      0x14
  80
  81#define LCDC_PCR        0x18
  82
  83#define LCDC_HCR        0x1C
  84#define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
  85#define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
  86#define HCR_H_WAIT_2(x) ((x) & 0xff)
  87
  88#define LCDC_VCR        0x20
  89#define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
  90#define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
  91#define VCR_V_WAIT_2(x) ((x) & 0xff)
  92
  93#define LCDC_POS        0x24
  94#define POS_POS(x)      ((x) & 1f)
  95
  96#define LCDC_LSCR1      0x28
  97/* bit fields in imxfb.h */
  98
  99#define LCDC_PWMR       0x2C
 100/* bit fields in imxfb.h */
 101
 102#define LCDC_DMACR      0x30
 103/* bit fields in imxfb.h */
 104
 105#define LCDC_RMCR       0x34
 106
 107#define RMCR_LCDC_EN_MX1        (1<<1)
 108
 109#define RMCR_SELF_REF   (1<<0)
 110
 111#define LCDC_LCDICR     0x38
 112#define LCDICR_INT_SYN  (1<<2)
 113#define LCDICR_INT_CON  (1)
 114
 115#define LCDC_LCDISR     0x40
 116#define LCDISR_UDR_ERR  (1<<3)
 117#define LCDISR_ERR_RES  (1<<2)
 118#define LCDISR_EOF      (1<<1)
 119#define LCDISR_BOF      (1<<0)
 120
 121#define IMXFB_LSCR1_DEFAULT 0x00120300
 122
 123/* Used fb-mode. Can be set on kernel command line, therefore file-static. */
 124static const char *fb_mode;
 125
 126/*
 127 * These are the bitfields for each
 128 * display depth that we support.
 129 */
 130struct imxfb_rgb {
 131        struct fb_bitfield      red;
 132        struct fb_bitfield      green;
 133        struct fb_bitfield      blue;
 134        struct fb_bitfield      transp;
 135};
 136
 137enum imxfb_type {
 138        IMX1_FB,
 139        IMX21_FB,
 140};
 141
 142struct imxfb_info {
 143        struct platform_device  *pdev;
 144        void __iomem            *regs;
 145        struct clk              *clk_ipg;
 146        struct clk              *clk_ahb;
 147        struct clk              *clk_per;
 148        enum imxfb_type         devtype;
 149        bool                    enabled;
 150
 151        /*
 152         * These are the addresses we mapped
 153         * the framebuffer memory region to.
 154         */
 155        dma_addr_t              map_dma;
 156        u_char                  *map_cpu;
 157        u_int                   map_size;
 158
 159        u_char                  *screen_cpu;
 160        dma_addr_t              screen_dma;
 161        u_int                   palette_size;
 162
 163        dma_addr_t              dbar1;
 164        dma_addr_t              dbar2;
 165
 166        u_int                   pcr;
 167        u_int                   pwmr;
 168        u_int                   lscr1;
 169        u_int                   dmacr;
 170        u_int                   cmap_inverse:1,
 171                                cmap_static:1,
 172                                unused:30;
 173
 174        struct imx_fb_videomode *mode;
 175        int                     num_modes;
 176#ifdef PWMR_BACKLIGHT_AVAILABLE
 177        struct backlight_device *bl;
 178#endif
 179
 180        void (*lcd_power)(int);
 181        void (*backlight_power)(int);
 182};
 183
 184static struct platform_device_id imxfb_devtype[] = {
 185        {
 186                .name = "imx1-fb",
 187                .driver_data = IMX1_FB,
 188        }, {
 189                .name = "imx21-fb",
 190                .driver_data = IMX21_FB,
 191        }, {
 192                /* sentinel */
 193        }
 194};
 195MODULE_DEVICE_TABLE(platform, imxfb_devtype);
 196
 197static struct of_device_id imxfb_of_dev_id[] = {
 198        {
 199                .compatible = "fsl,imx1-fb",
 200                .data = &imxfb_devtype[IMX1_FB],
 201        }, {
 202                .compatible = "fsl,imx21-fb",
 203                .data = &imxfb_devtype[IMX21_FB],
 204        }, {
 205                /* sentinel */
 206        }
 207};
 208MODULE_DEVICE_TABLE(of, imxfb_of_dev_id);
 209
 210static inline int is_imx1_fb(struct imxfb_info *fbi)
 211{
 212        return fbi->devtype == IMX1_FB;
 213}
 214
 215#define IMX_NAME        "IMX"
 216
 217/*
 218 * Minimum X and Y resolutions
 219 */
 220#define MIN_XRES        64
 221#define MIN_YRES        64
 222
 223/* Actually this really is 18bit support, the lowest 2 bits of each colour
 224 * are unused in hardware. We claim to have 24bit support to make software
 225 * like X work, which does not support 18bit.
 226 */
 227static struct imxfb_rgb def_rgb_18 = {
 228        .red    = {.offset = 16, .length = 8,},
 229        .green  = {.offset = 8, .length = 8,},
 230        .blue   = {.offset = 0, .length = 8,},
 231        .transp = {.offset = 0, .length = 0,},
 232};
 233
 234static struct imxfb_rgb def_rgb_16_tft = {
 235        .red    = {.offset = 11, .length = 5,},
 236        .green  = {.offset = 5, .length = 6,},
 237        .blue   = {.offset = 0, .length = 5,},
 238        .transp = {.offset = 0, .length = 0,},
 239};
 240
 241static struct imxfb_rgb def_rgb_16_stn = {
 242        .red    = {.offset = 8, .length = 4,},
 243        .green  = {.offset = 4, .length = 4,},
 244        .blue   = {.offset = 0, .length = 4,},
 245        .transp = {.offset = 0, .length = 0,},
 246};
 247
 248static struct imxfb_rgb def_rgb_8 = {
 249        .red    = {.offset = 0, .length = 8,},
 250        .green  = {.offset = 0, .length = 8,},
 251        .blue   = {.offset = 0, .length = 8,},
 252        .transp = {.offset = 0, .length = 0,},
 253};
 254
 255static int imxfb_activate_var(struct fb_var_screeninfo *var,
 256                struct fb_info *info);
 257
 258static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 259{
 260        chan &= 0xffff;
 261        chan >>= 16 - bf->length;
 262        return chan << bf->offset;
 263}
 264
 265static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
 266                u_int trans, struct fb_info *info)
 267{
 268        struct imxfb_info *fbi = info->par;
 269        u_int val, ret = 1;
 270
 271#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
 272        if (regno < fbi->palette_size) {
 273                val = (CNVT_TOHW(red, 4) << 8) |
 274                      (CNVT_TOHW(green,4) << 4) |
 275                      CNVT_TOHW(blue,  4);
 276
 277                writel(val, fbi->regs + 0x800 + (regno << 2));
 278                ret = 0;
 279        }
 280        return ret;
 281}
 282
 283static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 284                   u_int trans, struct fb_info *info)
 285{
 286        struct imxfb_info *fbi = info->par;
 287        unsigned int val;
 288        int ret = 1;
 289
 290        /*
 291         * If inverse mode was selected, invert all the colours
 292         * rather than the register number.  The register number
 293         * is what you poke into the framebuffer to produce the
 294         * colour you requested.
 295         */
 296        if (fbi->cmap_inverse) {
 297                red   = 0xffff - red;
 298                green = 0xffff - green;
 299                blue  = 0xffff - blue;
 300        }
 301
 302        /*
 303         * If greyscale is true, then we convert the RGB value
 304         * to greyscale no mater what visual we are using.
 305         */
 306        if (info->var.grayscale)
 307                red = green = blue = (19595 * red + 38470 * green +
 308                                        7471 * blue) >> 16;
 309
 310        switch (info->fix.visual) {
 311        case FB_VISUAL_TRUECOLOR:
 312                /*
 313                 * 12 or 16-bit True Colour.  We encode the RGB value
 314                 * according to the RGB bitfield information.
 315                 */
 316                if (regno < 16) {
 317                        u32 *pal = info->pseudo_palette;
 318
 319                        val  = chan_to_field(red, &info->var.red);
 320                        val |= chan_to_field(green, &info->var.green);
 321                        val |= chan_to_field(blue, &info->var.blue);
 322
 323                        pal[regno] = val;
 324                        ret = 0;
 325                }
 326                break;
 327
 328        case FB_VISUAL_STATIC_PSEUDOCOLOR:
 329        case FB_VISUAL_PSEUDOCOLOR:
 330                ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
 331                break;
 332        }
 333
 334        return ret;
 335}
 336
 337static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
 338{
 339        struct imx_fb_videomode *m;
 340        int i;
 341
 342        if (!fb_mode)
 343                return &fbi->mode[0];
 344
 345        for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
 346                if (!strcmp(m->mode.name, fb_mode))
 347                        return m;
 348        }
 349        return NULL;
 350}
 351
 352/*
 353 *  imxfb_check_var():
 354 *    Round up in the following order: bits_per_pixel, xres,
 355 *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 356 *    bitfields, horizontal timing, vertical timing.
 357 */
 358static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 359{
 360        struct imxfb_info *fbi = info->par;
 361        struct imxfb_rgb *rgb;
 362        const struct imx_fb_videomode *imxfb_mode;
 363        unsigned long lcd_clk;
 364        unsigned long long tmp;
 365        u32 pcr = 0;
 366
 367        if (var->xres < MIN_XRES)
 368                var->xres = MIN_XRES;
 369        if (var->yres < MIN_YRES)
 370                var->yres = MIN_YRES;
 371
 372        imxfb_mode = imxfb_find_mode(fbi);
 373        if (!imxfb_mode)
 374                return -EINVAL;
 375
 376        var->xres               = imxfb_mode->mode.xres;
 377        var->yres               = imxfb_mode->mode.yres;
 378        var->bits_per_pixel     = imxfb_mode->bpp;
 379        var->pixclock           = imxfb_mode->mode.pixclock;
 380        var->hsync_len          = imxfb_mode->mode.hsync_len;
 381        var->left_margin        = imxfb_mode->mode.left_margin;
 382        var->right_margin       = imxfb_mode->mode.right_margin;
 383        var->vsync_len          = imxfb_mode->mode.vsync_len;
 384        var->upper_margin       = imxfb_mode->mode.upper_margin;
 385        var->lower_margin       = imxfb_mode->mode.lower_margin;
 386        var->sync               = imxfb_mode->mode.sync;
 387        var->xres_virtual       = max(var->xres_virtual, var->xres);
 388        var->yres_virtual       = max(var->yres_virtual, var->yres);
 389
 390        pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
 391
 392        lcd_clk = clk_get_rate(fbi->clk_per);
 393
 394        tmp = var->pixclock * (unsigned long long)lcd_clk;
 395
 396        do_div(tmp, 1000000);
 397
 398        if (do_div(tmp, 1000000) > 500000)
 399                tmp++;
 400
 401        pcr = (unsigned int)tmp;
 402
 403        if (--pcr > 0x3F) {
 404                pcr = 0x3F;
 405                printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
 406                                lcd_clk / pcr);
 407        }
 408
 409        switch (var->bits_per_pixel) {
 410        case 32:
 411                pcr |= PCR_BPIX_18;
 412                rgb = &def_rgb_18;
 413                break;
 414        case 16:
 415        default:
 416                if (is_imx1_fb(fbi))
 417                        pcr |= PCR_BPIX_12;
 418                else
 419                        pcr |= PCR_BPIX_16;
 420
 421                if (imxfb_mode->pcr & PCR_TFT)
 422                        rgb = &def_rgb_16_tft;
 423                else
 424                        rgb = &def_rgb_16_stn;
 425                break;
 426        case 8:
 427                pcr |= PCR_BPIX_8;
 428                rgb = &def_rgb_8;
 429                break;
 430        }
 431
 432        /* add sync polarities */
 433        pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
 434
 435        fbi->pcr = pcr;
 436
 437        /*
 438         * Copy the RGB parameters for this display
 439         * from the machine specific parameters.
 440         */
 441        var->red    = rgb->red;
 442        var->green  = rgb->green;
 443        var->blue   = rgb->blue;
 444        var->transp = rgb->transp;
 445
 446        pr_debug("RGBT length = %d:%d:%d:%d\n",
 447                var->red.length, var->green.length, var->blue.length,
 448                var->transp.length);
 449
 450        pr_debug("RGBT offset = %d:%d:%d:%d\n",
 451                var->red.offset, var->green.offset, var->blue.offset,
 452                var->transp.offset);
 453
 454        return 0;
 455}
 456
 457/*
 458 * imxfb_set_par():
 459 *      Set the user defined part of the display for the specified console
 460 */
 461static int imxfb_set_par(struct fb_info *info)
 462{
 463        struct imxfb_info *fbi = info->par;
 464        struct fb_var_screeninfo *var = &info->var;
 465
 466        if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
 467                info->fix.visual = FB_VISUAL_TRUECOLOR;
 468        else if (!fbi->cmap_static)
 469                info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 470        else {
 471                /*
 472                 * Some people have weird ideas about wanting static
 473                 * pseudocolor maps.  I suspect their user space
 474                 * applications are broken.
 475                 */
 476                info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 477        }
 478
 479        info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
 480        fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 481
 482        imxfb_activate_var(var, info);
 483
 484        return 0;
 485}
 486
 487#ifdef PWMR_BACKLIGHT_AVAILABLE
 488static int imxfb_bl_get_brightness(struct backlight_device *bl)
 489{
 490        struct imxfb_info *fbi = bl_get_data(bl);
 491
 492        return readl(fbi->regs + LCDC_PWMR) & 0xFF;
 493}
 494
 495static int imxfb_bl_update_status(struct backlight_device *bl)
 496{
 497        struct imxfb_info *fbi = bl_get_data(bl);
 498        int brightness = bl->props.brightness;
 499
 500        if (!fbi->pwmr)
 501                return 0;
 502
 503        if (bl->props.power != FB_BLANK_UNBLANK)
 504                brightness = 0;
 505        if (bl->props.fb_blank != FB_BLANK_UNBLANK)
 506                brightness = 0;
 507
 508        fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
 509
 510        if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
 511                clk_prepare_enable(fbi->clk_ipg);
 512                clk_prepare_enable(fbi->clk_ahb);
 513                clk_prepare_enable(fbi->clk_per);
 514        }
 515        writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 516        if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
 517                clk_disable_unprepare(fbi->clk_per);
 518                clk_disable_unprepare(fbi->clk_ahb);
 519                clk_disable_unprepare(fbi->clk_ipg);
 520        }
 521
 522        return 0;
 523}
 524
 525static const struct backlight_ops imxfb_lcdc_bl_ops = {
 526        .update_status = imxfb_bl_update_status,
 527        .get_brightness = imxfb_bl_get_brightness,
 528};
 529
 530static void imxfb_init_backlight(struct imxfb_info *fbi)
 531{
 532        struct backlight_properties props;
 533        struct backlight_device *bl;
 534
 535        if (fbi->bl)
 536                return;
 537
 538        memset(&props, 0, sizeof(struct backlight_properties));
 539        props.max_brightness = 0xff;
 540        props.type = BACKLIGHT_RAW;
 541        writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 542
 543        bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
 544                                       &imxfb_lcdc_bl_ops, &props);
 545        if (IS_ERR(bl)) {
 546                dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
 547                                PTR_ERR(bl));
 548                return;
 549        }
 550
 551        fbi->bl = bl;
 552        bl->props.power = FB_BLANK_UNBLANK;
 553        bl->props.fb_blank = FB_BLANK_UNBLANK;
 554        bl->props.brightness = imxfb_bl_get_brightness(bl);
 555}
 556
 557static void imxfb_exit_backlight(struct imxfb_info *fbi)
 558{
 559        if (fbi->bl)
 560                backlight_device_unregister(fbi->bl);
 561}
 562#endif
 563
 564static void imxfb_enable_controller(struct imxfb_info *fbi)
 565{
 566
 567        if (fbi->enabled)
 568                return;
 569
 570        pr_debug("Enabling LCD controller\n");
 571
 572        writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
 573
 574        /* panning offset 0 (0 pixel offset)        */
 575        writel(0x00000000, fbi->regs + LCDC_POS);
 576
 577        /* disable hardware cursor */
 578        writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
 579                fbi->regs + LCDC_CPOS);
 580
 581        /*
 582         * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
 583         * on other SoCs
 584         */
 585        writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
 586
 587        clk_prepare_enable(fbi->clk_ipg);
 588        clk_prepare_enable(fbi->clk_ahb);
 589        clk_prepare_enable(fbi->clk_per);
 590        fbi->enabled = true;
 591
 592        if (fbi->backlight_power)
 593                fbi->backlight_power(1);
 594        if (fbi->lcd_power)
 595                fbi->lcd_power(1);
 596}
 597
 598static void imxfb_disable_controller(struct imxfb_info *fbi)
 599{
 600        if (!fbi->enabled)
 601                return;
 602
 603        pr_debug("Disabling LCD controller\n");
 604
 605        if (fbi->backlight_power)
 606                fbi->backlight_power(0);
 607        if (fbi->lcd_power)
 608                fbi->lcd_power(0);
 609
 610        clk_disable_unprepare(fbi->clk_per);
 611        clk_disable_unprepare(fbi->clk_ipg);
 612        clk_disable_unprepare(fbi->clk_ahb);
 613        fbi->enabled = false;
 614
 615        writel(0, fbi->regs + LCDC_RMCR);
 616}
 617
 618static int imxfb_blank(int blank, struct fb_info *info)
 619{
 620        struct imxfb_info *fbi = info->par;
 621
 622        pr_debug("imxfb_blank: blank=%d\n", blank);
 623
 624        switch (blank) {
 625        case FB_BLANK_POWERDOWN:
 626        case FB_BLANK_VSYNC_SUSPEND:
 627        case FB_BLANK_HSYNC_SUSPEND:
 628        case FB_BLANK_NORMAL:
 629                imxfb_disable_controller(fbi);
 630                break;
 631
 632        case FB_BLANK_UNBLANK:
 633                imxfb_enable_controller(fbi);
 634                break;
 635        }
 636        return 0;
 637}
 638
 639static struct fb_ops imxfb_ops = {
 640        .owner          = THIS_MODULE,
 641        .fb_check_var   = imxfb_check_var,
 642        .fb_set_par     = imxfb_set_par,
 643        .fb_setcolreg   = imxfb_setcolreg,
 644        .fb_fillrect    = cfb_fillrect,
 645        .fb_copyarea    = cfb_copyarea,
 646        .fb_imageblit   = cfb_imageblit,
 647        .fb_blank       = imxfb_blank,
 648};
 649
 650/*
 651 * imxfb_activate_var():
 652 *      Configures LCD Controller based on entries in var parameter.  Settings are
 653 *      only written to the controller if changes were made.
 654 */
 655static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
 656{
 657        struct imxfb_info *fbi = info->par;
 658        u32 ymax_mask = is_imx1_fb(fbi) ? YMAX_MASK_IMX1 : YMAX_MASK_IMX21;
 659
 660        pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 661                var->xres, var->hsync_len,
 662                var->left_margin, var->right_margin);
 663        pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 664                var->yres, var->vsync_len,
 665                var->upper_margin, var->lower_margin);
 666
 667#if DEBUG_VAR
 668        if (var->xres < 16        || var->xres > 1024)
 669                printk(KERN_ERR "%s: invalid xres %d\n",
 670                        info->fix.id, var->xres);
 671        if (var->hsync_len < 1    || var->hsync_len > 64)
 672                printk(KERN_ERR "%s: invalid hsync_len %d\n",
 673                        info->fix.id, var->hsync_len);
 674        if (var->left_margin > 255)
 675                printk(KERN_ERR "%s: invalid left_margin %d\n",
 676                        info->fix.id, var->left_margin);
 677        if (var->right_margin > 255)
 678                printk(KERN_ERR "%s: invalid right_margin %d\n",
 679                        info->fix.id, var->right_margin);
 680        if (var->yres < 1 || var->yres > ymax_mask)
 681                printk(KERN_ERR "%s: invalid yres %d\n",
 682                        info->fix.id, var->yres);
 683        if (var->vsync_len > 100)
 684                printk(KERN_ERR "%s: invalid vsync_len %d\n",
 685                        info->fix.id, var->vsync_len);
 686        if (var->upper_margin > 63)
 687                printk(KERN_ERR "%s: invalid upper_margin %d\n",
 688                        info->fix.id, var->upper_margin);
 689        if (var->lower_margin > 255)
 690                printk(KERN_ERR "%s: invalid lower_margin %d\n",
 691                        info->fix.id, var->lower_margin);
 692#endif
 693
 694        /* physical screen start address            */
 695        writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
 696                fbi->regs + LCDC_VPW);
 697
 698        writel(HCR_H_WIDTH(var->hsync_len - 1) |
 699                HCR_H_WAIT_1(var->right_margin - 1) |
 700                HCR_H_WAIT_2(var->left_margin - 3),
 701                fbi->regs + LCDC_HCR);
 702
 703        writel(VCR_V_WIDTH(var->vsync_len) |
 704                VCR_V_WAIT_1(var->lower_margin) |
 705                VCR_V_WAIT_2(var->upper_margin),
 706                fbi->regs + LCDC_VCR);
 707
 708        writel(SIZE_XMAX(var->xres) | (var->yres & ymax_mask),
 709                        fbi->regs + LCDC_SIZE);
 710
 711        writel(fbi->pcr, fbi->regs + LCDC_PCR);
 712#ifndef PWMR_BACKLIGHT_AVAILABLE
 713        if (fbi->pwmr)
 714                writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
 715#endif
 716        writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
 717
 718        /* dmacr = 0 is no valid value, as we need DMA control marks. */
 719        if (fbi->dmacr)
 720                writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
 721
 722        return 0;
 723}
 724
 725#ifdef CONFIG_PM
 726/*
 727 * Power management hooks.  Note that we won't be called from IRQ context,
 728 * unlike the blank functions above, so we may sleep.
 729 */
 730static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
 731{
 732        struct fb_info *info = platform_get_drvdata(dev);
 733        struct imxfb_info *fbi = info->par;
 734
 735        pr_debug("%s\n", __func__);
 736
 737        imxfb_disable_controller(fbi);
 738        return 0;
 739}
 740
 741static int imxfb_resume(struct platform_device *dev)
 742{
 743        struct fb_info *info = platform_get_drvdata(dev);
 744        struct imxfb_info *fbi = info->par;
 745
 746        pr_debug("%s\n", __func__);
 747
 748        imxfb_enable_controller(fbi);
 749        return 0;
 750}
 751#else
 752#define imxfb_suspend   NULL
 753#define imxfb_resume    NULL
 754#endif
 755
 756static int imxfb_init_fbinfo(struct platform_device *pdev)
 757{
 758        struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
 759        struct fb_info *info = dev_get_drvdata(&pdev->dev);
 760        struct imxfb_info *fbi = info->par;
 761        struct device_node *np;
 762
 763        pr_debug("%s\n",__func__);
 764
 765        info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
 766        if (!info->pseudo_palette)
 767                return -ENOMEM;
 768
 769        memset(fbi, 0, sizeof(struct imxfb_info));
 770
 771        fbi->devtype = pdev->id_entry->driver_data;
 772
 773        strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
 774
 775        info->fix.type                  = FB_TYPE_PACKED_PIXELS;
 776        info->fix.type_aux              = 0;
 777        info->fix.xpanstep              = 0;
 778        info->fix.ypanstep              = 0;
 779        info->fix.ywrapstep             = 0;
 780        info->fix.accel                 = FB_ACCEL_NONE;
 781
 782        info->var.nonstd                = 0;
 783        info->var.activate              = FB_ACTIVATE_NOW;
 784        info->var.height                = -1;
 785        info->var.width = -1;
 786        info->var.accel_flags           = 0;
 787        info->var.vmode                 = FB_VMODE_NONINTERLACED;
 788
 789        info->fbops                     = &imxfb_ops;
 790        info->flags                     = FBINFO_FLAG_DEFAULT |
 791                                          FBINFO_READS_FAST;
 792        if (pdata) {
 793                info->var.grayscale             = pdata->cmap_greyscale;
 794                fbi->cmap_inverse               = pdata->cmap_inverse;
 795                fbi->cmap_static                = pdata->cmap_static;
 796                fbi->lscr1                      = pdata->lscr1;
 797                fbi->dmacr                      = pdata->dmacr;
 798                fbi->pwmr                       = pdata->pwmr;
 799                fbi->lcd_power                  = pdata->lcd_power;
 800                fbi->backlight_power            = pdata->backlight_power;
 801        } else {
 802                np = pdev->dev.of_node;
 803                info->var.grayscale = of_property_read_bool(np,
 804                                                "cmap-greyscale");
 805                fbi->cmap_inverse = of_property_read_bool(np, "cmap-inverse");
 806                fbi->cmap_static = of_property_read_bool(np, "cmap-static");
 807
 808                fbi->lscr1 = IMXFB_LSCR1_DEFAULT;
 809                of_property_read_u32(np, "fsl,lscr1", &fbi->lscr1);
 810
 811                of_property_read_u32(np, "fsl,dmacr", &fbi->dmacr);
 812
 813                /* These two function pointers could be used by some specific
 814                 * platforms. */
 815                fbi->lcd_power = NULL;
 816                fbi->backlight_power = NULL;
 817        }
 818
 819        return 0;
 820}
 821
 822static int imxfb_of_read_mode(struct device *dev, struct device_node *np,
 823                struct imx_fb_videomode *imxfb_mode)
 824{
 825        int ret;
 826        struct fb_videomode *of_mode = &imxfb_mode->mode;
 827        u32 bpp;
 828        u32 pcr;
 829
 830        ret = of_property_read_string(np, "model", &of_mode->name);
 831        if (ret)
 832                of_mode->name = NULL;
 833
 834        ret = of_get_fb_videomode(np, of_mode, OF_USE_NATIVE_MODE);
 835        if (ret) {
 836                dev_err(dev, "Failed to get videomode from DT\n");
 837                return ret;
 838        }
 839
 840        ret = of_property_read_u32(np, "bits-per-pixel", &bpp);
 841        ret |= of_property_read_u32(np, "fsl,pcr", &pcr);
 842
 843        if (ret) {
 844                dev_err(dev, "Failed to read bpp and pcr from DT\n");
 845                return -EINVAL;
 846        }
 847
 848        if (bpp < 1 || bpp > 255) {
 849                dev_err(dev, "Bits per pixel have to be between 1 and 255\n");
 850                return -EINVAL;
 851        }
 852
 853        imxfb_mode->bpp = bpp;
 854        imxfb_mode->pcr = pcr;
 855
 856        return 0;
 857}
 858
 859static int imxfb_probe(struct platform_device *pdev)
 860{
 861        struct imxfb_info *fbi;
 862        struct fb_info *info;
 863        struct imx_fb_platform_data *pdata;
 864        struct resource *res;
 865        struct imx_fb_videomode *m;
 866        const struct of_device_id *of_id;
 867        int ret, i;
 868        int bytes_per_pixel;
 869
 870        dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
 871
 872        of_id = of_match_device(imxfb_of_dev_id, &pdev->dev);
 873        if (of_id)
 874                pdev->id_entry = of_id->data;
 875
 876        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 877        if (!res)
 878                return -ENODEV;
 879
 880        pdata = pdev->dev.platform_data;
 881
 882        info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
 883        if (!info)
 884                return -ENOMEM;
 885
 886        fbi = info->par;
 887
 888        platform_set_drvdata(pdev, info);
 889
 890        ret = imxfb_init_fbinfo(pdev);
 891        if (ret < 0)
 892                goto failed_init;
 893
 894        if (pdata) {
 895                if (!fb_mode)
 896                        fb_mode = pdata->mode[0].mode.name;
 897
 898                fbi->mode = pdata->mode;
 899                fbi->num_modes = pdata->num_modes;
 900        } else {
 901                struct device_node *display_np;
 902                fb_mode = NULL;
 903
 904                display_np = of_parse_phandle(pdev->dev.of_node, "display", 0);
 905                if (!display_np) {
 906                        dev_err(&pdev->dev, "No display defined in devicetree\n");
 907                        ret = -EINVAL;
 908                        goto failed_of_parse;
 909                }
 910
 911                /*
 912                 * imxfb does not support more modes, we choose only the native
 913                 * mode.
 914                 */
 915                fbi->num_modes = 1;
 916
 917                fbi->mode = devm_kzalloc(&pdev->dev,
 918                                sizeof(struct imx_fb_videomode), GFP_KERNEL);
 919                if (!fbi->mode) {
 920                        ret = -ENOMEM;
 921                        goto failed_of_parse;
 922                }
 923
 924                ret = imxfb_of_read_mode(&pdev->dev, display_np, fbi->mode);
 925                if (ret)
 926                        goto failed_of_parse;
 927        }
 928
 929        /* Calculate maximum bytes used per pixel. In most cases this should
 930         * be the same as m->bpp/8 */
 931        m = &fbi->mode[0];
 932        bytes_per_pixel = (m->bpp + 7) / 8;
 933        for (i = 0; i < fbi->num_modes; i++, m++)
 934                info->fix.smem_len = max_t(size_t, info->fix.smem_len,
 935                                m->mode.xres * m->mode.yres * bytes_per_pixel);
 936
 937        res = request_mem_region(res->start, resource_size(res),
 938                                DRIVER_NAME);
 939        if (!res) {
 940                ret = -EBUSY;
 941                goto failed_req;
 942        }
 943
 944        fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
 945        if (IS_ERR(fbi->clk_ipg)) {
 946                ret = PTR_ERR(fbi->clk_ipg);
 947                goto failed_getclock;
 948        }
 949
 950        fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
 951        if (IS_ERR(fbi->clk_ahb)) {
 952                ret = PTR_ERR(fbi->clk_ahb);
 953                goto failed_getclock;
 954        }
 955
 956        fbi->clk_per = devm_clk_get(&pdev->dev, "per");
 957        if (IS_ERR(fbi->clk_per)) {
 958                ret = PTR_ERR(fbi->clk_per);
 959                goto failed_getclock;
 960        }
 961
 962        fbi->regs = ioremap(res->start, resource_size(res));
 963        if (fbi->regs == NULL) {
 964                dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
 965                ret = -ENOMEM;
 966                goto failed_ioremap;
 967        }
 968
 969        /* Seems not being used by anyone, so no support for oftree */
 970        if (!pdata || !pdata->fixed_screen_cpu) {
 971                fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
 972                fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
 973                                fbi->map_size, &fbi->map_dma, GFP_KERNEL);
 974
 975                if (!fbi->map_cpu) {
 976                        dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
 977                        ret = -ENOMEM;
 978                        goto failed_map;
 979                }
 980
 981                info->screen_base = fbi->map_cpu;
 982                fbi->screen_cpu = fbi->map_cpu;
 983                fbi->screen_dma = fbi->map_dma;
 984                info->fix.smem_start = fbi->screen_dma;
 985        } else {
 986                /* Fixed framebuffer mapping enables location of the screen in eSRAM */
 987                fbi->map_cpu = pdata->fixed_screen_cpu;
 988                fbi->map_dma = pdata->fixed_screen_dma;
 989                info->screen_base = fbi->map_cpu;
 990                fbi->screen_cpu = fbi->map_cpu;
 991                fbi->screen_dma = fbi->map_dma;
 992                info->fix.smem_start = fbi->screen_dma;
 993        }
 994
 995        if (pdata && pdata->init) {
 996                ret = pdata->init(fbi->pdev);
 997                if (ret)
 998                        goto failed_platform_init;
 999        }
1000
1001
1002        INIT_LIST_HEAD(&info->modelist);
1003        for (i = 0; i < fbi->num_modes; i++)
1004                fb_add_videomode(&fbi->mode[i].mode, &info->modelist);
1005
1006        /*
1007         * This makes sure that our colour bitfield
1008         * descriptors are correctly initialised.
1009         */
1010        imxfb_check_var(&info->var, info);
1011
1012        ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
1013        if (ret < 0)
1014                goto failed_cmap;
1015
1016        imxfb_set_par(info);
1017        ret = register_framebuffer(info);
1018        if (ret < 0) {
1019                dev_err(&pdev->dev, "failed to register framebuffer\n");
1020                goto failed_register;
1021        }
1022
1023        imxfb_enable_controller(fbi);
1024        fbi->pdev = pdev;
1025#ifdef PWMR_BACKLIGHT_AVAILABLE
1026        imxfb_init_backlight(fbi);
1027#endif
1028
1029        return 0;
1030
1031failed_register:
1032        fb_dealloc_cmap(&info->cmap);
1033failed_cmap:
1034        if (pdata && pdata->exit)
1035                pdata->exit(fbi->pdev);
1036failed_platform_init:
1037        if (pdata && !pdata->fixed_screen_cpu)
1038                dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
1039                        fbi->map_dma);
1040failed_map:
1041        iounmap(fbi->regs);
1042failed_ioremap:
1043failed_getclock:
1044        release_mem_region(res->start, resource_size(res));
1045failed_req:
1046failed_of_parse:
1047        kfree(info->pseudo_palette);
1048failed_init:
1049        framebuffer_release(info);
1050        return ret;
1051}
1052
1053static int imxfb_remove(struct platform_device *pdev)
1054{
1055        struct imx_fb_platform_data *pdata;
1056        struct fb_info *info = platform_get_drvdata(pdev);
1057        struct imxfb_info *fbi = info->par;
1058        struct resource *res;
1059
1060        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1061
1062        imxfb_disable_controller(fbi);
1063
1064#ifdef PWMR_BACKLIGHT_AVAILABLE
1065        imxfb_exit_backlight(fbi);
1066#endif
1067        unregister_framebuffer(info);
1068
1069        pdata = pdev->dev.platform_data;
1070        if (pdata && pdata->exit)
1071                pdata->exit(fbi->pdev);
1072
1073        fb_dealloc_cmap(&info->cmap);
1074        kfree(info->pseudo_palette);
1075        framebuffer_release(info);
1076
1077        iounmap(fbi->regs);
1078        release_mem_region(res->start, resource_size(res));
1079
1080        return 0;
1081}
1082
1083static void imxfb_shutdown(struct platform_device *dev)
1084{
1085        struct fb_info *info = platform_get_drvdata(dev);
1086        struct imxfb_info *fbi = info->par;
1087        imxfb_disable_controller(fbi);
1088}
1089
1090static struct platform_driver imxfb_driver = {
1091        .suspend        = imxfb_suspend,
1092        .resume         = imxfb_resume,
1093        .remove         = imxfb_remove,
1094        .shutdown       = imxfb_shutdown,
1095        .driver         = {
1096                .name   = DRIVER_NAME,
1097                .of_match_table = imxfb_of_dev_id,
1098        },
1099        .id_table       = imxfb_devtype,
1100};
1101
1102static int imxfb_setup(void)
1103{
1104#ifndef MODULE
1105        char *opt, *options = NULL;
1106
1107        if (fb_get_options("imxfb", &options))
1108                return -ENODEV;
1109
1110        if (!options || !*options)
1111                return 0;
1112
1113        while ((opt = strsep(&options, ",")) != NULL) {
1114                if (!*opt)
1115                        continue;
1116                else
1117                        fb_mode = opt;
1118        }
1119#endif
1120        return 0;
1121}
1122
1123static int __init imxfb_init(void)
1124{
1125        int ret = imxfb_setup();
1126
1127        if (ret < 0)
1128                return ret;
1129
1130        return platform_driver_probe(&imxfb_driver, imxfb_probe);
1131}
1132
1133static void __exit imxfb_cleanup(void)
1134{
1135        platform_driver_unregister(&imxfb_driver);
1136}
1137
1138module_init(imxfb_init);
1139module_exit(imxfb_cleanup);
1140
1141MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
1142MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1143MODULE_LICENSE("GPL");
1144
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