drivers/video/fbdev/atmel_lcdfb.c

   1 /*
   2  *  Driver for AT91/AT32 LCD Controller
   3  *
   4  *  Copyright (C) 2007 Atmel Corporation
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file COPYING in the main directory of this archive for
   8  * more details.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/dma-mapping.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/clk.h>
  16 #include <linux/fb.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19 #include <linux/backlight.h>
  20 #include <linux/gfp.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/of_device.h>
  24 #include <linux/of_gpio.h>
  25 #include <video/of_display_timing.h>
  26 #include <linux/regulator/consumer.h>
  27 #include <video/videomode.h>
  28
  29 #include <asm/gpio.h>
  30
  31 #include <video/atmel_lcdc.h>
  32
  33 struct atmel_lcdfb_config {
  34         bool have_alt_pixclock;
  35         bool have_hozval;
  36         bool have_intensity_bit;
  37 };
  38
  39  /* LCD Controller info data structure, stored in device platform_data */
  40 struct atmel_lcdfb_info {
  41         spinlock_t              lock;
  42         struct fb_info          *info;
  43         void __iomem            *mmio;
  44         int                     irq_base;
  45         struct work_struct      task;
  46
  47         unsigned int            smem_len;
  48         struct platform_device  *pdev;
  49         struct clk              *bus_clk;
  50         struct clk              *lcdc_clk;
  51
  52         struct backlight_device *backlight;
  53         u8                      bl_power;
  54         u8                      saved_lcdcon;
  55
  56         u32                     pseudo_palette[16];
  57         bool                    have_intensity_bit;
  58
  59         struct atmel_lcdfb_pdata pdata;
  60
  61         struct atmel_lcdfb_config *config;
  62         struct regulator        *reg_lcd;
  63 };
  64
  65 struct atmel_lcdfb_power_ctrl_gpio {
  66         int gpio;
  67         int active_low;
  68
  69         struct list_head list;
  70 };
  71
  72 #define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))
  73 #define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))
  74
  75 /* configurable parameters */
  76 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  77 #define ATMEL_LCDC_DMA_BURST_LEN        8       /* words */
  78 #define ATMEL_LCDC_FIFO_SIZE            512     /* words */
  79
  80 static struct atmel_lcdfb_config at91sam9261_config = {
  81         .have_hozval            = true,
  82         .have_intensity_bit     = true,
  83 };
  84
  85 static struct atmel_lcdfb_config at91sam9263_config = {
  86         .have_intensity_bit     = true,
  87 };
  88
  89 static struct atmel_lcdfb_config at91sam9g10_config = {
  90         .have_hozval            = true,
  91 };
  92
  93 static struct atmel_lcdfb_config at91sam9g45_config = {
  94         .have_alt_pixclock      = true,
  95 };
  96
  97 static struct atmel_lcdfb_config at91sam9g45es_config = {
  98 };
  99
 100 static struct atmel_lcdfb_config at91sam9rl_config = {
 101         .have_intensity_bit     = true,
 102 };
 103
 104 static struct atmel_lcdfb_config at32ap_config = {
 105         .have_hozval            = true,
 106 };
 107
 108 static const struct platform_device_id atmel_lcdfb_devtypes[] = {
 109         {
 110                 .name = "at91sam9261-lcdfb",
 111                 .driver_data = (unsigned long)&at91sam9261_config,
 112         }, {
 113                 .name = "at91sam9263-lcdfb",
 114                 .driver_data = (unsigned long)&at91sam9263_config,
 115         }, {
 116                 .name = "at91sam9g10-lcdfb",
 117                 .driver_data = (unsigned long)&at91sam9g10_config,
 118         }, {
 119                 .name = "at91sam9g45-lcdfb",
 120                 .driver_data = (unsigned long)&at91sam9g45_config,
 121         }, {
 122                 .name = "at91sam9g45es-lcdfb",
 123                 .driver_data = (unsigned long)&at91sam9g45es_config,
 124         }, {
 125                 .name = "at91sam9rl-lcdfb",
 126                 .driver_data = (unsigned long)&at91sam9rl_config,
 127         }, {
 128                 .name = "at32ap-lcdfb",
 129                 .driver_data = (unsigned long)&at32ap_config,
 130         }, {
 131                 /* terminator */
 132         }
 133 };
 134 MODULE_DEVICE_TABLE(platform, atmel_lcdfb_devtypes);
 135
 136 static struct atmel_lcdfb_config *
 137 atmel_lcdfb_get_config(struct platform_device *pdev)
 138 {
 139         unsigned long data;
 140
 141         data = platform_get_device_id(pdev)->driver_data;
 142
 143         return (struct atmel_lcdfb_config *)data;
 144 }
 145
 146 #if defined(CONFIG_ARCH_AT91)
 147 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 148                                          | FBINFO_PARTIAL_PAN_OK \
 149                                          | FBINFO_HWACCEL_YPAN)
 150
 151 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 152                                         struct fb_var_screeninfo *var,
 153                                         struct fb_info *info)
 154 {
 155
 156 }
 157 #elif defined(CONFIG_AVR32)
 158 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 159                                         | FBINFO_PARTIAL_PAN_OK \
 160                                         | FBINFO_HWACCEL_XPAN \
 161                                         | FBINFO_HWACCEL_YPAN)
 162
 163 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 164                                      struct fb_var_screeninfo *var,
 165                                      struct fb_info *info)
 166 {
 167         u32 dma2dcfg;
 168         u32 pixeloff;
 169
 170         pixeloff = (var->xoffset * info->var.bits_per_pixel) & 0x1f;
 171
 172         dma2dcfg = (info->var.xres_virtual - info->var.xres)
 173                  * info->var.bits_per_pixel / 8;
 174         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
 175         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
 176
 177         /* Update configuration */
 178         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
 179                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
 180                     | ATMEL_LCDC_DMAUPDT);
 181 }
 182 #endif
 183
 184 static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
 185                 | ATMEL_LCDC_POL_POSITIVE
 186                 | ATMEL_LCDC_ENA_PWMENABLE;
 187
 188 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
 189
 190 /* some bl->props field just changed */
 191 static int atmel_bl_update_status(struct backlight_device *bl)
 192 {
 193         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 194         int                     power = sinfo->bl_power;
 195         int                     brightness = bl->props.brightness;
 196
 197         /* REVISIT there may be a meaningful difference between
 198          * fb_blank and power ... there seem to be some cases
 199          * this doesn't handle correctly.
 200          */
 201         if (bl->props.fb_blank != sinfo->bl_power)
 202                 power = bl->props.fb_blank;
 203         else if (bl->props.power != sinfo->bl_power)
 204                 power = bl->props.power;
 205
 206         if (brightness < 0 && power == FB_BLANK_UNBLANK)
 207                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 208         else if (power != FB_BLANK_UNBLANK)
 209                 brightness = 0;
 210
 211         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
 212         if (contrast_ctr & ATMEL_LCDC_POL_POSITIVE)
 213                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
 214                         brightness ? contrast_ctr : 0);
 215         else
 216                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 217
 218         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
 219
 220         return 0;
 221 }
 222
 223 static int atmel_bl_get_brightness(struct backlight_device *bl)
 224 {
 225         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 226
 227         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 228 }
 229
 230 static const struct backlight_ops atmel_lcdc_bl_ops = {
 231         .update_status = atmel_bl_update_status,
 232         .get_brightness = atmel_bl_get_brightness,
 233 };
 234
 235 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 236 {
 237         struct backlight_properties props;
 238         struct backlight_device *bl;
 239
 240         sinfo->bl_power = FB_BLANK_UNBLANK;
 241
 242         if (sinfo->backlight)
 243                 return;
 244
 245         memset(&props, 0, sizeof(struct backlight_properties));
 246         props.type = BACKLIGHT_RAW;
 247         props.max_brightness = 0xff;
 248         bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
 249                                        &atmel_lcdc_bl_ops, &props);
 250         if (IS_ERR(bl)) {
 251                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
 252                                 PTR_ERR(bl));
 253                 return;
 254         }
 255         sinfo->backlight = bl;
 256
 257         bl->props.power = FB_BLANK_UNBLANK;
 258         bl->props.fb_blank = FB_BLANK_UNBLANK;
 259         bl->props.brightness = atmel_bl_get_brightness(bl);
 260 }
 261
 262 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 263 {
 264         if (!sinfo->backlight)
 265                 return;
 266
 267         if (sinfo->backlight->ops) {
 268                 sinfo->backlight->props.power = FB_BLANK_POWERDOWN;
 269                 sinfo->backlight->ops->update_status(sinfo->backlight);
 270         }
 271         backlight_device_unregister(sinfo->backlight);
 272 }
 273
 274 #else
 275
 276 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 277 {
 278         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
 279 }
 280
 281 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 282 {
 283 }
 284
 285 #endif
 286
 287 static void init_contrast(struct atmel_lcdfb_info *sinfo)
 288 {
 289         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 290
 291         /* contrast pwm can be 'inverted' */
 292         if (pdata->lcdcon_pol_negative)
 293                 contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
 294
 295         /* have some default contrast/backlight settings */
 296         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 297         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 298
 299         if (pdata->lcdcon_is_backlight)
 300                 init_backlight(sinfo);
 301 }
 302
 303 static inline void atmel_lcdfb_power_control(struct atmel_lcdfb_info *sinfo, int on)
 304 {
 305         int ret;
 306         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 307
 308         if (pdata->atmel_lcdfb_power_control)
 309                 pdata->atmel_lcdfb_power_control(pdata, on);
 310         else if (sinfo->reg_lcd) {
 311                 if (on) {
 312                         ret = regulator_enable(sinfo->reg_lcd);
 313                         if (ret)
 314                                 dev_err(&sinfo->pdev->dev,
 315                                         "lcd regulator enable failed:   %d\n", ret);
 316                 } else {
 317                         ret = regulator_disable(sinfo->reg_lcd);
 318                         if (ret)
 319                                 dev_err(&sinfo->pdev->dev,
 320                                         "lcd regulator disable failed: %d\n", ret);
 321                 }
 322         }
 323 }
 324
 325 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
 326         .type           = FB_TYPE_PACKED_PIXELS,
 327         .visual         = FB_VISUAL_TRUECOLOR,
 328         .xpanstep       = 0,
 329         .ypanstep       = 1,
 330         .ywrapstep      = 0,
 331         .accel          = FB_ACCEL_NONE,
 332 };
 333
 334 static unsigned long compute_hozval(struct atmel_lcdfb_info *sinfo,
 335                                                         unsigned long xres)
 336 {
 337         unsigned long lcdcon2;
 338         unsigned long value;
 339
 340         if (!sinfo->config->have_hozval)
 341                 return xres;
 342
 343         lcdcon2 = lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2);
 344         value = xres;
 345         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
 346                 /* STN display */
 347                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
 348                         value *= 3;
 349                 }
 350                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
 351                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
 352                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
 353                         value = DIV_ROUND_UP(value, 4);
 354                 else
 355                         value = DIV_ROUND_UP(value, 8);
 356         }
 357
 358         return value;
 359 }
 360
 361 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
 362 {
 363         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 364
 365         /* Turn off the LCD controller and the DMA controller */
 366         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 367                         pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 368
 369         /* Wait for the LCDC core to become idle */
 370         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 371                 msleep(10);
 372
 373         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 374 }
 375
 376 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
 377 {
 378         atmel_lcdfb_stop_nowait(sinfo);
 379
 380         /* Wait for DMA engine to become idle... */
 381         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 382                 msleep(10);
 383 }
 384
 385 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
 386 {
 387         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 388
 389         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, pdata->default_dmacon);
 390         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 391                 (pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
 392                 | ATMEL_LCDC_PWR);
 393 }
 394
 395 static void atmel_lcdfb_update_dma(struct fb_info *info,
 396                                struct fb_var_screeninfo *var)
 397 {
 398         struct atmel_lcdfb_info *sinfo = info->par;
 399         struct fb_fix_screeninfo *fix = &info->fix;
 400         unsigned long dma_addr;
 401
 402         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
 403                     + var->xoffset * info->var.bits_per_pixel / 8);
 404
 405         dma_addr &= ~3UL;
 406
 407         /* Set framebuffer DMA base address and pixel offset */
 408         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
 409
 410         atmel_lcdfb_update_dma2d(sinfo, var, info);
 411 }
 412
 413 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
 414 {
 415         struct fb_info *info = sinfo->info;
 416
 417         dma_free_writecombine(info->device, info->fix.smem_len,
 418                                 info->screen_base, info->fix.smem_start);
 419 }
 420
 421 /**
 422  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
 423  *      @sinfo: the frame buffer to allocate memory for
 424  *
 425  *      This function is called only from the atmel_lcdfb_probe()
 426  *      so no locking by fb_info->mm_lock around smem_len setting is needed.
 427  */
 428 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
 429 {
 430         struct fb_info *info = sinfo->info;
 431         struct fb_var_screeninfo *var = &info->var;
 432         unsigned int smem_len;
 433
 434         smem_len = (var->xres_virtual * var->yres_virtual
 435                     * ((var->bits_per_pixel + 7) / 8));
 436         info->fix.smem_len = max(smem_len, sinfo->smem_len);
 437
 438         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
 439                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
 440
 441         if (!info->screen_base) {
 442                 return -ENOMEM;
 443         }
 444
 445         memset(info->screen_base, 0, info->fix.smem_len);
 446
 447         return 0;
 448 }
 449
 450 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
 451                                                      struct fb_info *info)
 452 {
 453         struct fb_videomode varfbmode;
 454         const struct fb_videomode *fbmode = NULL;
 455
 456         fb_var_to_videomode(&varfbmode, var);
 457         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
 458         if (fbmode)
 459                 fb_videomode_to_var(var, fbmode);
 460         return fbmode;
 461 }
 462
 463
 464 /**
 465  *      atmel_lcdfb_check_var - Validates a var passed in.
 466  *      @var: frame buffer variable screen structure
 467  *      @info: frame buffer structure that represents a single frame buffer
 468  *
 469  *      Checks to see if the hardware supports the state requested by
 470  *      var passed in. This function does not alter the hardware
 471  *      state!!!  This means the data stored in struct fb_info and
 472  *      struct atmel_lcdfb_info do not change. This includes the var
 473  *      inside of struct fb_info.  Do NOT change these. This function
 474  *      can be called on its own if we intent to only test a mode and
 475  *      not actually set it. The stuff in modedb.c is a example of
 476  *      this. If the var passed in is slightly off by what the
 477  *      hardware can support then we alter the var PASSED in to what
 478  *      we can do. If the hardware doesn't support mode change a
 479  *      -EINVAL will be returned by the upper layers. You don't need
 480  *      to implement this function then. If you hardware doesn't
 481  *      support changing the resolution then this function is not
 482  *      needed. In this case the driver would just provide a var that
 483  *      represents the static state the screen is in.
 484  *
 485  *      Returns negative errno on error, or zero on success.
 486  */
 487 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 488                              struct fb_info *info)
 489 {
 490         struct device *dev = info->device;
 491         struct atmel_lcdfb_info *sinfo = info->par;
 492         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 493         unsigned long clk_value_khz;
 494
 495         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 496
 497         dev_dbg(dev, "%s:\n", __func__);
 498
 499         if (!(var->pixclock && var->bits_per_pixel)) {
 500                 /* choose a suitable mode if possible */
 501                 if (!atmel_lcdfb_choose_mode(var, info)) {
 502                         dev_err(dev, "needed value not specified\n");
 503                         return -EINVAL;
 504                 }
 505         }
 506
 507         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
 508         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
 509         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
 510         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
 511
 512         if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
 513                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
 514                 return -EINVAL;
 515         }
 516
 517         /* Do not allow to have real resoulution larger than virtual */
 518         if (var->xres > var->xres_virtual)
 519                 var->xres_virtual = var->xres;
 520
 521         if (var->yres > var->yres_virtual)
 522                 var->yres_virtual = var->yres;
 523
 524         /* Force same alignment for each line */
 525         var->xres = (var->xres + 3) & ~3UL;
 526         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
 527
 528         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
 529         var->transp.msb_right = 0;
 530         var->transp.offset = var->transp.length = 0;
 531         var->xoffset = var->yoffset = 0;
 532
 533         if (info->fix.smem_len) {
 534                 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
 535                                          * ((var->bits_per_pixel + 7) / 8));
 536                 if (smem_len > info->fix.smem_len) {
 537                         dev_err(dev, "Frame buffer is too small (%u) for screen size (need at least %u)\n",
 538                                 info->fix.smem_len, smem_len);
 539                         return -EINVAL;
 540                 }
 541         }
 542
 543         /* Saturate vertical and horizontal timings at maximum values */
 544         var->vsync_len = min_t(u32, var->vsync_len,
 545                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
 546         var->upper_margin = min_t(u32, var->upper_margin,
 547                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
 548         var->lower_margin = min_t(u32, var->lower_margin,
 549                         ATMEL_LCDC_VFP);
 550         var->right_margin = min_t(u32, var->right_margin,
 551                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
 552         var->hsync_len = min_t(u32, var->hsync_len,
 553                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
 554         var->left_margin = min_t(u32, var->left_margin,
 555                         ATMEL_LCDC_HBP + 1);
 556
 557         /* Some parameters can't be zero */
 558         var->vsync_len = max_t(u32, var->vsync_len, 1);
 559         var->right_margin = max_t(u32, var->right_margin, 1);
 560         var->hsync_len = max_t(u32, var->hsync_len, 1);
 561         var->left_margin = max_t(u32, var->left_margin, 1);
 562
 563         switch (var->bits_per_pixel) {
 564         case 1:
 565         case 2:
 566         case 4:
 567         case 8:
 568                 var->red.offset = var->green.offset = var->blue.offset = 0;
 569                 var->red.length = var->green.length = var->blue.length
 570                         = var->bits_per_pixel;
 571                 break;
 572         case 16:
 573                 /* Older SOCs use IBGR:555 rather than BGR:565. */
 574                 if (sinfo->config->have_intensity_bit)
 575                         var->green.length = 5;
 576                 else
 577                         var->green.length = 6;
 578
 579                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 580                         /* RGB:5X5 mode */
 581                         var->red.offset = var->green.length + 5;
 582                         var->blue.offset = 0;
 583                 } else {
 584                         /* BGR:5X5 mode */
 585                         var->red.offset = 0;
 586                         var->blue.offset = var->green.length + 5;
 587                 }
 588                 var->green.offset = 5;
 589                 var->red.length = var->blue.length = 5;
 590                 break;
 591         case 32:
 592                 var->transp.offset = 24;
 593                 var->transp.length = 8;
 594                 /* fall through */
 595         case 24:
 596                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 597                         /* RGB:888 mode */
 598                         var->red.offset = 16;
 599                         var->blue.offset = 0;
 600                 } else {
 601                         /* BGR:888 mode */
 602                         var->red.offset = 0;
 603                         var->blue.offset = 16;
 604                 }
 605                 var->green.offset = 8;
 606                 var->red.length = var->green.length = var->blue.length = 8;
 607                 break;
 608         default:
 609                 dev_err(dev, "color depth %d not supported\n",
 610                                         var->bits_per_pixel);
 611                 return -EINVAL;
 612         }
 613
 614         return 0;
 615 }
 616
 617 /*
 618  * LCD reset sequence
 619  */
 620 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
 621 {
 622         might_sleep();
 623
 624         atmel_lcdfb_stop(sinfo);
 625         atmel_lcdfb_start(sinfo);
 626 }
 627
 628 /**
 629  *      atmel_lcdfb_set_par - Alters the hardware state.
 630  *      @info: frame buffer structure that represents a single frame buffer
 631  *
 632  *      Using the fb_var_screeninfo in fb_info we set the resolution
 633  *      of the this particular framebuffer. This function alters the
 634  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 635  *      not alter var in fb_info since we are using that data. This
 636  *      means we depend on the data in var inside fb_info to be
 637  *      supported by the hardware.  atmel_lcdfb_check_var is always called
 638  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 639  *      change the resolution you don't need this function.
 640  *
 641  */
 642 static int atmel_lcdfb_set_par(struct fb_info *info)
 643 {
 644         struct atmel_lcdfb_info *sinfo = info->par;
 645         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 646         unsigned long hozval_linesz;
 647         unsigned long value;
 648         unsigned long clk_value_khz;
 649         unsigned long bits_per_line;
 650         unsigned long pix_factor = 2;
 651
 652         might_sleep();
 653
 654         dev_dbg(info->device, "%s:\n", __func__);
 655         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 656                  info->var.xres, info->var.yres,
 657                  info->var.xres_virtual, info->var.yres_virtual);
 658
 659         atmel_lcdfb_stop_nowait(sinfo);
 660
 661         if (info->var.bits_per_pixel == 1)
 662                 info->fix.visual = FB_VISUAL_MONO01;
 663         else if (info->var.bits_per_pixel <= 8)
 664                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 665         else
 666                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 667
 668         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 669         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 670
 671         /* Re-initialize the DMA engine... */
 672         dev_dbg(info->device, "  * update DMA engine\n");
 673         atmel_lcdfb_update_dma(info, &info->var);
 674
 675         /* ...set frame size and burst length = 8 words (?) */
 676         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 677         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 678         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 679
 680         /* Now, the LCDC core... */
 681
 682         /* Set pixel clock */
 683         if (sinfo->config->have_alt_pixclock)
 684                 pix_factor = 1;
 685
 686         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 687
 688         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 689
 690         if (value < pix_factor) {
 691                 dev_notice(info->device, "Bypassing pixel clock divider\n");
 692                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 693         } else {
 694                 value = (value / pix_factor) - 1;
 695                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
 696                                 value);
 697                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
 698                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
 699                 info->var.pixclock =
 700                         KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
 701                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 702                                         PICOS2KHZ(info->var.pixclock));
 703         }
 704
 705
 706         /* Initialize control register 2 */
 707         value = pdata->default_lcdcon2;
 708
 709         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 710                 value |= ATMEL_LCDC_INVLINE_INVERTED;
 711         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 712                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
 713
 714         switch (info->var.bits_per_pixel) {
 715                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 716                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 717                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 718                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 719                 case 15: /* fall through */
 720                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 721                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 722                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 723                 default: BUG(); break;
 724         }
 725         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 726         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 727
 728         /* Vertical timing */
 729         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 730         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 731         value |= info->var.lower_margin;
 732         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 733         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 734
 735         /* Horizontal timing */
 736         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 737         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 738         value |= (info->var.left_margin - 1);
 739         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 740         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 741
 742         /* Horizontal value (aka line size) */
 743         hozval_linesz = compute_hozval(sinfo, info->var.xres);
 744
 745         /* Display size */
 746         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 747         value |= info->var.yres - 1;
 748         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 749         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 750
 751         /* FIFO Threshold: Use formula from data sheet */
 752         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 753         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 754
 755         /* Toggle LCD_MODE every frame */
 756         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 757
 758         /* Disable all interrupts */
 759         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 760         /* Enable FIFO & DMA errors */
 761         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
 762
 763         /* ...wait for DMA engine to become idle... */
 764         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 765                 msleep(10);
 766
 767         atmel_lcdfb_start(sinfo);
 768
 769         dev_dbg(info->device, "  * DONE\n");
 770
 771         return 0;
 772 }
 773
 774 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 775 {
 776         chan &= 0xffff;
 777         chan >>= 16 - bf->length;
 778         return chan << bf->offset;
 779 }
 780
 781 /**
 782  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 783  *      @regno: Which register in the CLUT we are programming
 784  *      @red: The red value which can be up to 16 bits wide
 785  *      @green: The green value which can be up to 16 bits wide
 786  *      @blue:  The blue value which can be up to 16 bits wide.
 787  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 788  *      @info: frame buffer info structure
 789  *
 790  *      Set a single color register. The values supplied have a 16 bit
 791  *      magnitude which needs to be scaled in this function for the hardware.
 792  *      Things to take into consideration are how many color registers, if
 793  *      any, are supported with the current color visual. With truecolor mode
 794  *      no color palettes are supported. Here a pseudo palette is created
 795  *      which we store the value in pseudo_palette in struct fb_info. For
 796  *      pseudocolor mode we have a limited color palette. To deal with this
 797  *      we can program what color is displayed for a particular pixel value.
 798  *      DirectColor is similar in that we can program each color field. If
 799  *      we have a static colormap we don't need to implement this function.
 800  *
 801  *      Returns negative errno on error, or zero on success. In an
 802  *      ideal world, this would have been the case, but as it turns
 803  *      out, the other drivers return 1 on failure, so that's what
 804  *      we're going to do.
 805  */
 806 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 807                              unsigned int green, unsigned int blue,
 808                              unsigned int transp, struct fb_info *info)
 809 {
 810         struct atmel_lcdfb_info *sinfo = info->par;
 811         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 812         unsigned int val;
 813         u32 *pal;
 814         int ret = 1;
 815
 816         if (info->var.grayscale)
 817                 red = green = blue = (19595 * red + 38470 * green
 818                                       + 7471 * blue) >> 16;
 819
 820         switch (info->fix.visual) {
 821         case FB_VISUAL_TRUECOLOR:
 822                 if (regno < 16) {
 823                         pal = info->pseudo_palette;
 824
 825                         val  = chan_to_field(red, &info->var.red);
 826                         val |= chan_to_field(green, &info->var.green);
 827                         val |= chan_to_field(blue, &info->var.blue);
 828
 829                         pal[regno] = val;
 830                         ret = 0;
 831                 }
 832                 break;
 833
 834         case FB_VISUAL_PSEUDOCOLOR:
 835                 if (regno < 256) {
 836                         if (sinfo->config->have_intensity_bit) {
 837                                 /* old style I+BGR:555 */
 838                                 val  = ((red   >> 11) & 0x001f);
 839                                 val |= ((green >>  6) & 0x03e0);
 840                                 val |= ((blue  >>  1) & 0x7c00);
 841
 842                                 /*
 843                                  * TODO: intensity bit. Maybe something like
 844                                  *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 845                                  */
 846                         } else {
 847                                 /* new style BGR:565 / RGB:565 */
 848                                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 849                                         val  = ((blue >> 11) & 0x001f);
 850                                         val |= ((red  >>  0) & 0xf800);
 851                                 } else {
 852                                         val  = ((red  >> 11) & 0x001f);
 853                                         val |= ((blue >>  0) & 0xf800);
 854                                 }
 855
 856                                 val |= ((green >>  5) & 0x07e0);
 857                         }
 858
 859                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 860                         ret = 0;
 861                 }
 862                 break;
 863
 864         case FB_VISUAL_MONO01:
 865                 if (regno < 2) {
 866                         val = (regno == 0) ? 0x00 : 0x1F;
 867                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 868                         ret = 0;
 869                 }
 870                 break;
 871
 872         }
 873
 874         return ret;
 875 }
 876
 877 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 878                                struct fb_info *info)
 879 {
 880         dev_dbg(info->device, "%s\n", __func__);
 881
 882         atmel_lcdfb_update_dma(info, var);
 883
 884         return 0;
 885 }
 886
 887 static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
 888 {
 889         struct atmel_lcdfb_info *sinfo = info->par;
 890
 891         switch (blank_mode) {
 892         case FB_BLANK_UNBLANK:
 893         case FB_BLANK_NORMAL:
 894                 atmel_lcdfb_start(sinfo);
 895                 break;
 896         case FB_BLANK_VSYNC_SUSPEND:
 897         case FB_BLANK_HSYNC_SUSPEND:
 898                 break;
 899         case FB_BLANK_POWERDOWN:
 900                 atmel_lcdfb_stop(sinfo);
 901                 break;
 902         default:
 903                 return -EINVAL;
 904         }
 905
 906         /* let fbcon do a soft blank for us */
 907         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
 908 }
 909
 910 static struct fb_ops atmel_lcdfb_ops = {
 911         .owner          = THIS_MODULE,
 912         .fb_check_var   = atmel_lcdfb_check_var,
 913         .fb_set_par     = atmel_lcdfb_set_par,
 914         .fb_setcolreg   = atmel_lcdfb_setcolreg,
 915         .fb_blank       = atmel_lcdfb_blank,
 916         .fb_pan_display = atmel_lcdfb_pan_display,
 917         .fb_fillrect    = cfb_fillrect,
 918         .fb_copyarea    = cfb_copyarea,
 919         .fb_imageblit   = cfb_imageblit,
 920 };
 921
 922 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 923 {
 924         struct fb_info *info = dev_id;
 925         struct atmel_lcdfb_info *sinfo = info->par;
 926         u32 status;
 927
 928         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 929         if (status & ATMEL_LCDC_UFLWI) {
 930                 dev_warn(info->device, "FIFO underflow %#x\n", status);
 931                 /* reset DMA and FIFO to avoid screen shifting */
 932                 schedule_work(&sinfo->task);
 933         }
 934         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
 935         return IRQ_HANDLED;
 936 }
 937
 938 /*
 939  * LCD controller task (to reset the LCD)
 940  */
 941 static void atmel_lcdfb_task(struct work_struct *work)
 942 {
 943         struct atmel_lcdfb_info *sinfo =
 944                 container_of(work, struct atmel_lcdfb_info, task);
 945
 946         atmel_lcdfb_reset(sinfo);
 947 }
 948
 949 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 950 {
 951         struct fb_info *info = sinfo->info;
 952         int ret = 0;
 953
 954         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 955
 956         dev_info(info->device,
 957                "%luKiB frame buffer at %08lx (mapped at %p)\n",
 958                (unsigned long)info->fix.smem_len / 1024,
 959                (unsigned long)info->fix.smem_start,
 960                info->screen_base);
 961
 962         /* Allocate colormap */
 963         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 964         if (ret < 0)
 965                 dev_err(info->device, "Alloc color map failed\n");
 966
 967         return ret;
 968 }
 969
 970 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 971 {
 972         clk_prepare_enable(sinfo->bus_clk);
 973         clk_prepare_enable(sinfo->lcdc_clk);
 974 }
 975
 976 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 977 {
 978         clk_disable_unprepare(sinfo->bus_clk);
 979         clk_disable_unprepare(sinfo->lcdc_clk);
 980 }
 981
 982 #ifdef CONFIG_OF
 983 static const struct of_device_id atmel_lcdfb_dt_ids[] = {
 984         { .compatible = "atmel,at91sam9261-lcdc" , .data = &at91sam9261_config, },
 985         { .compatible = "atmel,at91sam9263-lcdc" , .data = &at91sam9263_config, },
 986         { .compatible = "atmel,at91sam9g10-lcdc" , .data = &at91sam9g10_config, },
 987         { .compatible = "atmel,at91sam9g45-lcdc" , .data = &at91sam9g45_config, },
 988         { .compatible = "atmel,at91sam9g45es-lcdc" , .data = &at91sam9g45es_config, },
 989         { .compatible = "atmel,at91sam9rl-lcdc" , .data = &at91sam9rl_config, },
 990         { .compatible = "atmel,at32ap-lcdc" , .data = &at32ap_config, },
 991         { /* sentinel */ }
 992 };
 993
 994 MODULE_DEVICE_TABLE(of, atmel_lcdfb_dt_ids);
 995
 996 static const char *atmel_lcdfb_wiring_modes[] = {
 997         [ATMEL_LCDC_WIRING_BGR] = "BRG",
 998         [ATMEL_LCDC_WIRING_RGB] = "RGB",
 999 };
1000
1001 static int atmel_lcdfb_get_of_wiring_modes(struct device_node *np)
1002 {
1003         const char *mode;
1004         int err, i;
1005
1006         err = of_property_read_string(np, "atmel,lcd-wiring-mode", &mode);
1007         if (err < 0)
1008                 return ATMEL_LCDC_WIRING_BGR;
1009
1010         for (i = 0; i < ARRAY_SIZE(atmel_lcdfb_wiring_modes); i++)
1011                 if (!strcasecmp(mode, atmel_lcdfb_wiring_modes[i]))
1012                         return i;
1013
1014         return -ENODEV;
1015 }
1016
1017 static void atmel_lcdfb_power_control_gpio(struct atmel_lcdfb_pdata *pdata, int on)
1018 {
1019         struct atmel_lcdfb_power_ctrl_gpio *og;
1020
1021         list_for_each_entry(og, &pdata->pwr_gpios, list)
1022                 gpio_set_value(og->gpio, on);
1023 }
1024
1025 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
1026 {
1027         struct fb_info *info = sinfo->info;
1028         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
1029         struct fb_var_screeninfo *var = &info->var;
1030         struct device *dev = &sinfo->pdev->dev;
1031         struct device_node *np =dev->of_node;
1032         struct device_node *display_np;
1033         struct device_node *timings_np;
1034         struct display_timings *timings;
1035         enum of_gpio_flags flags;
1036         struct atmel_lcdfb_power_ctrl_gpio *og;
1037         bool is_gpio_power = false;
1038         int ret = -ENOENT;
1039         int i, gpio;
1040
1041         sinfo->config = (struct atmel_lcdfb_config*)
1042                 of_match_device(atmel_lcdfb_dt_ids, dev)->data;
1043
1044         display_np = of_parse_phandle(np, "display", 0);
1045         if (!display_np) {
1046                 dev_err(dev, "failed to find display phandle\n");
1047                 return -ENOENT;
1048         }
1049
1050         ret = of_property_read_u32(display_np, "bits-per-pixel", &var->bits_per_pixel);
1051         if (ret < 0) {
1052                 dev_err(dev, "failed to get property bits-per-pixel\n");
1053                 goto put_display_node;
1054         }
1055
1056         ret = of_property_read_u32(display_np, "atmel,guard-time", &pdata->guard_time);
1057         if (ret < 0) {
1058                 dev_err(dev, "failed to get property atmel,guard-time\n");
1059                 goto put_display_node;
1060         }
1061
1062         ret = of_property_read_u32(display_np, "atmel,lcdcon2", &pdata->default_lcdcon2);
1063         if (ret < 0) {
1064                 dev_err(dev, "failed to get property atmel,lcdcon2\n");
1065                 goto put_display_node;
1066         }
1067
1068         ret = of_property_read_u32(display_np, "atmel,dmacon", &pdata->default_dmacon);
1069         if (ret < 0) {
1070                 dev_err(dev, "failed to get property bits-per-pixel\n");
1071                 goto put_display_node;
1072         }
1073
1074         INIT_LIST_HEAD(&pdata->pwr_gpios);
1075         ret = -ENOMEM;
1076         for (i = 0; i < of_gpio_named_count(display_np, "atmel,power-control-gpio"); i++) {
1077                 gpio = of_get_named_gpio_flags(display_np, "atmel,power-control-gpio",
1078                                                i, &flags);
1079                 if (gpio < 0)
1080                         continue;
1081
1082                 og = devm_kzalloc(dev, sizeof(*og), GFP_KERNEL);
1083                 if (!og)
1084                         goto put_display_node;
1085
1086                 og->gpio = gpio;
1087                 og->active_low = flags & OF_GPIO_ACTIVE_LOW;
1088                 is_gpio_power = true;
1089                 ret = devm_gpio_request(dev, gpio, "lcd-power-control-gpio");
1090                 if (ret) {
1091                         dev_err(dev, "request gpio %d failed\n", gpio);
1092                         goto put_display_node;
1093                 }
1094
1095                 ret = gpio_direction_output(gpio, og->active_low);
1096                 if (ret) {
1097                         dev_err(dev, "set direction output gpio %d failed\n", gpio);
1098                         goto put_display_node;
1099                 }
1100                 list_add(&og->list, &pdata->pwr_gpios);
1101         }
1102
1103         if (is_gpio_power)
1104                 pdata->atmel_lcdfb_power_control = atmel_lcdfb_power_control_gpio;
1105
1106         ret = atmel_lcdfb_get_of_wiring_modes(display_np);
1107         if (ret < 0) {
1108                 dev_err(dev, "invalid atmel,lcd-wiring-mode\n");
1109                 goto put_display_node;
1110         }
1111         pdata->lcd_wiring_mode = ret;
1112
1113         pdata->lcdcon_is_backlight = of_property_read_bool(display_np, "atmel,lcdcon-backlight");
1114         pdata->lcdcon_pol_negative = of_property_read_bool(display_np, "atmel,lcdcon-backlight-inverted");
1115
1116         timings = of_get_display_timings(display_np);
1117         if (!timings) {
1118                 dev_err(dev, "failed to get display timings\n");
1119                 ret = -EINVAL;
1120                 goto put_display_node;
1121         }
1122
1123         timings_np = of_get_child_by_name(display_np, "display-timings");
1124         if (!timings_np) {
1125                 dev_err(dev, "failed to find display-timings node\n");
1126                 ret = -ENODEV;
1127                 goto put_display_node;
1128         }
1129
1130         for (i = 0; i < of_get_child_count(timings_np); i++) {
1131                 struct videomode vm;
1132                 struct fb_videomode fb_vm;
1133
1134                 ret = videomode_from_timings(timings, &vm, i);
1135                 if (ret < 0)
1136                         goto put_timings_node;
1137                 ret = fb_videomode_from_videomode(&vm, &fb_vm);
1138                 if (ret < 0)
1139                         goto put_timings_node;
1140
1141                 fb_add_videomode(&fb_vm, &info->modelist);
1142         }
1143
1144         /*
1145          * FIXME: Make sure we are not referencing any fields in display_np
1146          * and timings_np and drop our references to them before returning to
1147          * avoid leaking the nodes on probe deferral and driver unbind.
1148          */
1149
1150         return 0;
1151
1152 put_timings_node:
1153         of_node_put(timings_np);
1154 put_display_node:
1155         of_node_put(display_np);
1156         return ret;
1157 }
1158 #else
1159 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
1160 {
1161         return 0;
1162 }
1163 #endif
1164
1165 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
1166 {
1167         struct device *dev = &pdev->dev;
1168         struct fb_info *info;
1169         struct atmel_lcdfb_info *sinfo;
1170         struct atmel_lcdfb_pdata *pdata = NULL;
1171         struct resource *regs = NULL;
1172         struct resource *map = NULL;
1173         struct fb_modelist *modelist;
1174         int ret;
1175
1176         dev_dbg(dev, "%s BEGIN\n", __func__);
1177
1178         ret = -ENOMEM;
1179         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
1180         if (!info) {
1181                 dev_err(dev, "cannot allocate memory\n");
1182                 goto out;
1183         }
1184
1185         sinfo = info->par;
1186         sinfo->pdev = pdev;
1187         sinfo->info = info;
1188
1189         INIT_LIST_HEAD(&info->modelist);
1190
1191         if (pdev->dev.of_node) {
1192                 ret = atmel_lcdfb_of_init(sinfo);
1193                 if (ret)
1194                         goto free_info;
1195         } else if (dev_get_platdata(dev)) {
1196                 struct fb_monspecs *monspecs;
1197                 int i;
1198
1199                 pdata = dev_get_platdata(dev);
1200                 monspecs = pdata->default_monspecs;
1201                 sinfo->pdata = *pdata;
1202
1203                 for (i = 0; i < monspecs->modedb_len; i++)
1204                         fb_add_videomode(&monspecs->modedb[i], &info->modelist);
1205
1206                 sinfo->config = atmel_lcdfb_get_config(pdev);
1207
1208                 info->var.bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16;
1209                 memcpy(&info->monspecs, pdata->default_monspecs, sizeof(info->monspecs));
1210         } else {
1211                 dev_err(dev, "cannot get default configuration\n");
1212                 goto free_info;
1213         }
1214
1215         if (!sinfo->config)
1216                 goto free_info;
1217
1218         sinfo->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
1219         if (IS_ERR(sinfo->reg_lcd))
1220                 sinfo->reg_lcd = NULL;
1221
1222         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
1223         info->pseudo_palette = sinfo->pseudo_palette;
1224         info->fbops = &atmel_lcdfb_ops;
1225
1226         info->fix = atmel_lcdfb_fix;
1227         strcpy(info->fix.id, sinfo->pdev->name);
1228
1229         /* Enable LCDC Clocks */
1230         sinfo->bus_clk = clk_get(dev, "hclk");
1231         if (IS_ERR(sinfo->bus_clk)) {
1232                 ret = PTR_ERR(sinfo->bus_clk);
1233                 goto free_info;
1234         }
1235         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
1236         if (IS_ERR(sinfo->lcdc_clk)) {
1237                 ret = PTR_ERR(sinfo->lcdc_clk);
1238                 goto put_bus_clk;
1239         }
1240         atmel_lcdfb_start_clock(sinfo);
1241
1242         modelist = list_first_entry(&info->modelist,
1243                         struct fb_modelist, list);
1244         fb_videomode_to_var(&info->var, &modelist->mode);
1245
1246         atmel_lcdfb_check_var(&info->var, info);
1247
1248         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1249         if (!regs) {
1250                 dev_err(dev, "resources unusable\n");
1251                 ret = -ENXIO;
1252                 goto stop_clk;
1253         }
1254
1255         sinfo->irq_base = platform_get_irq(pdev, 0);
1256         if (sinfo->irq_base < 0) {
1257                 dev_err(dev, "unable to get irq\n");
1258                 ret = sinfo->irq_base;
1259                 goto stop_clk;
1260         }
1261
1262         /* Initialize video memory */
1263         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1264         if (map) {
1265                 /* use a pre-allocated memory buffer */
1266                 info->fix.smem_start = map->start;
1267                 info->fix.smem_len = resource_size(map);
1268                 if (!request_mem_region(info->fix.smem_start,
1269                                         info->fix.smem_len, pdev->name)) {
1270                         ret = -EBUSY;
1271                         goto stop_clk;
1272                 }
1273
1274                 info->screen_base = ioremap_wc(info->fix.smem_start,
1275                                                info->fix.smem_len);
1276                 if (!info->screen_base) {
1277                         ret = -ENOMEM;
1278                         goto release_intmem;
1279                 }
1280
1281                 /*
1282                  * Don't clear the framebuffer -- someone may have set
1283                  * up a splash image.
1284                  */
1285         } else {
1286                 /* allocate memory buffer */
1287                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
1288                 if (ret < 0) {
1289                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
1290                         goto stop_clk;
1291                 }
1292         }
1293
1294         /* LCDC registers */
1295         info->fix.mmio_start = regs->start;
1296         info->fix.mmio_len = resource_size(regs);
1297
1298         if (!request_mem_region(info->fix.mmio_start,
1299                                 info->fix.mmio_len, pdev->name)) {
1300                 ret = -EBUSY;
1301                 goto free_fb;
1302         }
1303
1304         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
1305         if (!sinfo->mmio) {
1306                 dev_err(dev, "cannot map LCDC registers\n");
1307                 ret = -ENOMEM;
1308                 goto release_mem;
1309         }
1310
1311         /* Initialize PWM for contrast or backlight ("off") */
1312         init_contrast(sinfo);
1313
1314         /* interrupt */
1315         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
1316         if (ret) {
1317                 dev_err(dev, "request_irq failed: %d\n", ret);
1318                 goto unmap_mmio;
1319         }
1320
1321         /* Some operations on the LCDC might sleep and
1322          * require a preemptible task context */
1323         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
1324
1325         ret = atmel_lcdfb_init_fbinfo(sinfo);
1326         if (ret < 0) {
1327                 dev_err(dev, "init fbinfo failed: %d\n", ret);
1328                 goto unregister_irqs;
1329         }
1330
1331         ret = atmel_lcdfb_set_par(info);
1332         if (ret < 0) {
1333                 dev_err(dev, "set par failed: %d\n", ret);
1334                 goto unregister_irqs;
1335         }
1336
1337         dev_set_drvdata(dev, info);
1338
1339         /*
1340          * Tell the world that we're ready to go
1341          */
1342         ret = register_framebuffer(info);
1343         if (ret < 0) {
1344                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
1345                 goto reset_drvdata;
1346         }
1347
1348         /* Power up the LCDC screen */
1349         atmel_lcdfb_power_control(sinfo, 1);
1350
1351         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1352                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1353
1354         return 0;
1355
1356 reset_drvdata:
1357         dev_set_drvdata(dev, NULL);
1358         fb_dealloc_cmap(&info->cmap);
1359 unregister_irqs:
1360         cancel_work_sync(&sinfo->task);
1361         free_irq(sinfo->irq_base, info);
1362 unmap_mmio:
1363         exit_backlight(sinfo);
1364         iounmap(sinfo->mmio);
1365 release_mem:
1366         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1367 free_fb:
1368         if (map)
1369                 iounmap(info->screen_base);
1370         else
1371                 atmel_lcdfb_free_video_memory(sinfo);
1372
1373 release_intmem:
1374         if (map)
1375                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1376 stop_clk:
1377         atmel_lcdfb_stop_clock(sinfo);
1378         clk_put(sinfo->lcdc_clk);
1379 put_bus_clk:
1380         clk_put(sinfo->bus_clk);
1381 free_info:
1382         framebuffer_release(info);
1383 out:
1384         dev_dbg(dev, "%s FAILED\n", __func__);
1385         return ret;
1386 }
1387
1388 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1389 {
1390         struct device *dev = &pdev->dev;
1391         struct fb_info *info = dev_get_drvdata(dev);
1392         struct atmel_lcdfb_info *sinfo;
1393         struct atmel_lcdfb_pdata *pdata;
1394
1395         if (!info || !info->par)
1396                 return 0;
1397         sinfo = info->par;
1398         pdata = &sinfo->pdata;
1399
1400         cancel_work_sync(&sinfo->task);
1401         exit_backlight(sinfo);
1402         atmel_lcdfb_power_control(sinfo, 0);
1403         unregister_framebuffer(info);
1404         atmel_lcdfb_stop_clock(sinfo);
1405         clk_put(sinfo->lcdc_clk);
1406         clk_put(sinfo->bus_clk);
1407         fb_dealloc_cmap(&info->cmap);
1408         free_irq(sinfo->irq_base, info);
1409         iounmap(sinfo->mmio);
1410         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1411         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1412                 iounmap(info->screen_base);
1413                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1414         } else {
1415                 atmel_lcdfb_free_video_memory(sinfo);
1416         }
1417
1418         framebuffer_release(info);
1419
1420         return 0;
1421 }
1422
1423 #ifdef CONFIG_PM
1424
1425 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1426 {
1427         struct fb_info *info = platform_get_drvdata(pdev);
1428         struct atmel_lcdfb_info *sinfo = info->par;
1429
1430         /*
1431          * We don't want to handle interrupts while the clock is
1432          * stopped. It may take forever.
1433          */
1434         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1435
1436         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR);
1437         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1438         atmel_lcdfb_power_control(sinfo, 0);
1439         atmel_lcdfb_stop(sinfo);
1440         atmel_lcdfb_stop_clock(sinfo);
1441
1442         return 0;
1443 }
1444
1445 static int atmel_lcdfb_resume(struct platform_device *pdev)
1446 {
1447         struct fb_info *info = platform_get_drvdata(pdev);
1448         struct atmel_lcdfb_info *sinfo = info->par;
1449
1450         atmel_lcdfb_start_clock(sinfo);
1451         atmel_lcdfb_start(sinfo);
1452         atmel_lcdfb_power_control(sinfo, 1);
1453         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1454
1455         /* Enable FIFO & DMA errors */
1456         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1457                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1458
1459         return 0;
1460 }
1461
1462 #else
1463 #define atmel_lcdfb_suspend     NULL
1464 #define atmel_lcdfb_resume      NULL
1465 #endif
1466
1467 static struct platform_driver atmel_lcdfb_driver = {
1468         .remove         = __exit_p(atmel_lcdfb_remove),
1469         .suspend        = atmel_lcdfb_suspend,
1470         .resume         = atmel_lcdfb_resume,
1471         .id_table       = atmel_lcdfb_devtypes,
1472         .driver         = {
1473                 .name   = "atmel_lcdfb",
1474                 .of_match_table = of_match_ptr(atmel_lcdfb_dt_ids),
1475         },
1476 };
1477
1478 module_platform_driver_probe(atmel_lcdfb_driver, atmel_lcdfb_probe);
1479
1480 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1481 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1482 MODULE_LICENSE("GPL");