drivers/video/fbdev/jz4740_fb.c

   1 /*
   2  *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
   3  *      JZ4740 SoC LCD framebuffer driver
   4  *
   5  *  This program is free software; you can redistribute it and/or modify it
   6  *  under  the terms of  the GNU General Public License as published by the
   7  *  Free Software Foundation;  either version 2 of the License, or (at your
   8  *  option) any later version.
   9  *
  10  *  You should have received a copy of the GNU General Public License along
  11  *  with this program; if not, write to the Free Software Foundation, Inc.,
  12  *  675 Mass Ave, Cambridge, MA 02139, USA.
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/mutex.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/pinctrl/consumer.h>
  21
  22 #include <linux/clk.h>
  23 #include <linux/delay.h>
  24
  25 #include <linux/console.h>
  26 #include <linux/fb.h>
  27
  28 #include <linux/dma-mapping.h>
  29
  30 #include <asm/mach-jz4740/jz4740_fb.h>
  31
  32 #define JZ_REG_LCD_CFG          0x00
  33 #define JZ_REG_LCD_VSYNC        0x04
  34 #define JZ_REG_LCD_HSYNC        0x08
  35 #define JZ_REG_LCD_VAT          0x0C
  36 #define JZ_REG_LCD_DAH          0x10
  37 #define JZ_REG_LCD_DAV          0x14
  38 #define JZ_REG_LCD_PS           0x18
  39 #define JZ_REG_LCD_CLS          0x1C
  40 #define JZ_REG_LCD_SPL          0x20
  41 #define JZ_REG_LCD_REV          0x24
  42 #define JZ_REG_LCD_CTRL         0x30
  43 #define JZ_REG_LCD_STATE        0x34
  44 #define JZ_REG_LCD_IID          0x38
  45 #define JZ_REG_LCD_DA0          0x40
  46 #define JZ_REG_LCD_SA0          0x44
  47 #define JZ_REG_LCD_FID0         0x48
  48 #define JZ_REG_LCD_CMD0         0x4C
  49 #define JZ_REG_LCD_DA1          0x50
  50 #define JZ_REG_LCD_SA1          0x54
  51 #define JZ_REG_LCD_FID1         0x58
  52 #define JZ_REG_LCD_CMD1         0x5C
  53
  54 #define JZ_LCD_CFG_SLCD                 BIT(31)
  55 #define JZ_LCD_CFG_PS_DISABLE           BIT(23)
  56 #define JZ_LCD_CFG_CLS_DISABLE          BIT(22)
  57 #define JZ_LCD_CFG_SPL_DISABLE          BIT(21)
  58 #define JZ_LCD_CFG_REV_DISABLE          BIT(20)
  59 #define JZ_LCD_CFG_HSYNCM               BIT(19)
  60 #define JZ_LCD_CFG_PCLKM                BIT(18)
  61 #define JZ_LCD_CFG_INV                  BIT(17)
  62 #define JZ_LCD_CFG_SYNC_DIR             BIT(16)
  63 #define JZ_LCD_CFG_PS_POLARITY          BIT(15)
  64 #define JZ_LCD_CFG_CLS_POLARITY         BIT(14)
  65 #define JZ_LCD_CFG_SPL_POLARITY         BIT(13)
  66 #define JZ_LCD_CFG_REV_POLARITY         BIT(12)
  67 #define JZ_LCD_CFG_HSYNC_ACTIVE_LOW     BIT(11)
  68 #define JZ_LCD_CFG_PCLK_FALLING_EDGE    BIT(10)
  69 #define JZ_LCD_CFG_DE_ACTIVE_LOW        BIT(9)
  70 #define JZ_LCD_CFG_VSYNC_ACTIVE_LOW     BIT(8)
  71 #define JZ_LCD_CFG_18_BIT               BIT(7)
  72 #define JZ_LCD_CFG_PDW                  (BIT(5) | BIT(4))
  73 #define JZ_LCD_CFG_MODE_MASK 0xf
  74
  75 #define JZ_LCD_CTRL_BURST_4             (0x0 << 28)
  76 #define JZ_LCD_CTRL_BURST_8             (0x1 << 28)
  77 #define JZ_LCD_CTRL_BURST_16            (0x2 << 28)
  78 #define JZ_LCD_CTRL_RGB555              BIT(27)
  79 #define JZ_LCD_CTRL_OFUP                BIT(26)
  80 #define JZ_LCD_CTRL_FRC_GRAYSCALE_16    (0x0 << 24)
  81 #define JZ_LCD_CTRL_FRC_GRAYSCALE_4     (0x1 << 24)
  82 #define JZ_LCD_CTRL_FRC_GRAYSCALE_2     (0x2 << 24)
  83 #define JZ_LCD_CTRL_PDD_MASK            (0xff << 16)
  84 #define JZ_LCD_CTRL_EOF_IRQ             BIT(13)
  85 #define JZ_LCD_CTRL_SOF_IRQ             BIT(12)
  86 #define JZ_LCD_CTRL_OFU_IRQ             BIT(11)
  87 #define JZ_LCD_CTRL_IFU0_IRQ            BIT(10)
  88 #define JZ_LCD_CTRL_IFU1_IRQ            BIT(9)
  89 #define JZ_LCD_CTRL_DD_IRQ              BIT(8)
  90 #define JZ_LCD_CTRL_QDD_IRQ             BIT(7)
  91 #define JZ_LCD_CTRL_REVERSE_ENDIAN      BIT(6)
  92 #define JZ_LCD_CTRL_LSB_FISRT           BIT(5)
  93 #define JZ_LCD_CTRL_DISABLE             BIT(4)
  94 #define JZ_LCD_CTRL_ENABLE              BIT(3)
  95 #define JZ_LCD_CTRL_BPP_1               0x0
  96 #define JZ_LCD_CTRL_BPP_2               0x1
  97 #define JZ_LCD_CTRL_BPP_4               0x2
  98 #define JZ_LCD_CTRL_BPP_8               0x3
  99 #define JZ_LCD_CTRL_BPP_15_16           0x4
 100 #define JZ_LCD_CTRL_BPP_18_24           0x5
 101
 102 #define JZ_LCD_CMD_SOF_IRQ BIT(31)
 103 #define JZ_LCD_CMD_EOF_IRQ BIT(30)
 104 #define JZ_LCD_CMD_ENABLE_PAL BIT(28)
 105
 106 #define JZ_LCD_SYNC_MASK 0x3ff
 107
 108 #define JZ_LCD_STATE_DISABLED BIT(0)
 109
 110 struct jzfb_framedesc {
 111         uint32_t next;
 112         uint32_t addr;
 113         uint32_t id;
 114         uint32_t cmd;
 115 } __packed;
 116
 117 struct jzfb {
 118         struct fb_info *fb;
 119         struct platform_device *pdev;
 120         void __iomem *base;
 121         struct resource *mem;
 122         struct jz4740_fb_platform_data *pdata;
 123
 124         size_t vidmem_size;
 125         void *vidmem;
 126         dma_addr_t vidmem_phys;
 127         struct jzfb_framedesc *framedesc;
 128         dma_addr_t framedesc_phys;
 129
 130         struct clk *ldclk;
 131         struct clk *lpclk;
 132
 133         unsigned is_enabled:1;
 134         struct mutex lock;
 135
 136         uint32_t pseudo_palette[16];
 137 };
 138
 139 static const struct fb_fix_screeninfo jzfb_fix = {
 140         .id             = "JZ4740 FB",
 141         .type           = FB_TYPE_PACKED_PIXELS,
 142         .visual         = FB_VISUAL_TRUECOLOR,
 143         .xpanstep       = 0,
 144         .ypanstep       = 0,
 145         .ywrapstep      = 0,
 146         .accel          = FB_ACCEL_NONE,
 147 };
 148
 149 /* Based on CNVT_TOHW macro from skeletonfb.c */
 150 static inline uint32_t jzfb_convert_color_to_hw(unsigned val,
 151         struct fb_bitfield *bf)
 152 {
 153         return (((val << bf->length) + 0x7FFF - val) >> 16) << bf->offset;
 154 }
 155
 156 static int jzfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 157                         unsigned blue, unsigned transp, struct fb_info *fb)
 158 {
 159         uint32_t color;
 160
 161         if (regno >= 16)
 162                 return -EINVAL;
 163
 164         color = jzfb_convert_color_to_hw(red, &fb->var.red);
 165         color |= jzfb_convert_color_to_hw(green, &fb->var.green);
 166         color |= jzfb_convert_color_to_hw(blue, &fb->var.blue);
 167         color |= jzfb_convert_color_to_hw(transp, &fb->var.transp);
 168
 169         ((uint32_t *)(fb->pseudo_palette))[regno] = color;
 170
 171         return 0;
 172 }
 173
 174 static int jzfb_get_controller_bpp(struct jzfb *jzfb)
 175 {
 176         switch (jzfb->pdata->bpp) {
 177         case 18:
 178         case 24:
 179                 return 32;
 180         case 15:
 181                 return 16;
 182         default:
 183                 return jzfb->pdata->bpp;
 184         }
 185 }
 186
 187 static struct fb_videomode *jzfb_get_mode(struct jzfb *jzfb,
 188         struct fb_var_screeninfo *var)
 189 {
 190         size_t i;
 191         struct fb_videomode *mode = jzfb->pdata->modes;
 192
 193         for (i = 0; i < jzfb->pdata->num_modes; ++i, ++mode) {
 194                 if (mode->xres == var->xres && mode->yres == var->yres)
 195                         return mode;
 196         }
 197
 198         return NULL;
 199 }
 200
 201 static int jzfb_check_var(struct fb_var_screeninfo *var, struct fb_info *fb)
 202 {
 203         struct jzfb *jzfb = fb->par;
 204         struct fb_videomode *mode;
 205
 206         if (var->bits_per_pixel != jzfb_get_controller_bpp(jzfb) &&
 207                 var->bits_per_pixel != jzfb->pdata->bpp)
 208                 return -EINVAL;
 209
 210         mode = jzfb_get_mode(jzfb, var);
 211         if (mode == NULL)
 212                 return -EINVAL;
 213
 214         fb_videomode_to_var(var, mode);
 215
 216         switch (jzfb->pdata->bpp) {
 217         case 8:
 218                 break;
 219         case 15:
 220                 var->red.offset = 10;
 221                 var->red.length = 5;
 222                 var->green.offset = 6;
 223                 var->green.length = 5;
 224                 var->blue.offset = 0;
 225                 var->blue.length = 5;
 226                 break;
 227         case 16:
 228                 var->red.offset = 11;
 229                 var->red.length = 5;
 230                 var->green.offset = 5;
 231                 var->green.length = 6;
 232                 var->blue.offset = 0;
 233                 var->blue.length = 5;
 234                 break;
 235         case 18:
 236                 var->red.offset = 16;
 237                 var->red.length = 6;
 238                 var->green.offset = 8;
 239                 var->green.length = 6;
 240                 var->blue.offset = 0;
 241                 var->blue.length = 6;
 242                 var->bits_per_pixel = 32;
 243                 break;
 244         case 32:
 245         case 24:
 246                 var->transp.offset = 24;
 247                 var->transp.length = 8;
 248                 var->red.offset = 16;
 249                 var->red.length = 8;
 250                 var->green.offset = 8;
 251                 var->green.length = 8;
 252                 var->blue.offset = 0;
 253                 var->blue.length = 8;
 254                 var->bits_per_pixel = 32;
 255                 break;
 256         default:
 257                 break;
 258         }
 259
 260         return 0;
 261 }
 262
 263 static int jzfb_set_par(struct fb_info *info)
 264 {
 265         struct jzfb *jzfb = info->par;
 266         struct jz4740_fb_platform_data *pdata = jzfb->pdata;
 267         struct fb_var_screeninfo *var = &info->var;
 268         struct fb_videomode *mode;
 269         uint16_t hds, vds;
 270         uint16_t hde, vde;
 271         uint16_t ht, vt;
 272         uint32_t ctrl;
 273         uint32_t cfg;
 274         unsigned long rate;
 275
 276         mode = jzfb_get_mode(jzfb, var);
 277         if (mode == NULL)
 278                 return -EINVAL;
 279
 280         if (mode == info->mode)
 281                 return 0;
 282
 283         info->mode = mode;
 284
 285         hds = mode->hsync_len + mode->left_margin;
 286         hde = hds + mode->xres;
 287         ht = hde + mode->right_margin;
 288
 289         vds = mode->vsync_len + mode->upper_margin;
 290         vde = vds + mode->yres;
 291         vt = vde + mode->lower_margin;
 292
 293         ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
 294
 295         switch (pdata->bpp) {
 296         case 1:
 297                 ctrl |= JZ_LCD_CTRL_BPP_1;
 298                 break;
 299         case 2:
 300                 ctrl |= JZ_LCD_CTRL_BPP_2;
 301                 break;
 302         case 4:
 303                 ctrl |= JZ_LCD_CTRL_BPP_4;
 304                 break;
 305         case 8:
 306                 ctrl |= JZ_LCD_CTRL_BPP_8;
 307         break;
 308         case 15:
 309                 ctrl |= JZ_LCD_CTRL_RGB555; /* Falltrough */
 310         case 16:
 311                 ctrl |= JZ_LCD_CTRL_BPP_15_16;
 312                 break;
 313         case 18:
 314         case 24:
 315         case 32:
 316                 ctrl |= JZ_LCD_CTRL_BPP_18_24;
 317                 break;
 318         default:
 319                 break;
 320         }
 321
 322         cfg = pdata->lcd_type & 0xf;
 323
 324         if (!(mode->sync & FB_SYNC_HOR_HIGH_ACT))
 325                 cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
 326
 327         if (!(mode->sync & FB_SYNC_VERT_HIGH_ACT))
 328                 cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
 329
 330         if (pdata->pixclk_falling_edge)
 331                 cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
 332
 333         if (pdata->date_enable_active_low)
 334                 cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
 335
 336         if (pdata->lcd_type == JZ_LCD_TYPE_GENERIC_18_BIT)
 337                 cfg |= JZ_LCD_CFG_18_BIT;
 338
 339         if (mode->pixclock) {
 340                 rate = PICOS2KHZ(mode->pixclock) * 1000;
 341                 mode->refresh = rate / vt / ht;
 342         } else {
 343                 if (pdata->lcd_type == JZ_LCD_TYPE_8BIT_SERIAL)
 344                         rate = mode->refresh * (vt + 2 * mode->xres) * ht;
 345                 else
 346                         rate = mode->refresh * vt * ht;
 347
 348                 mode->pixclock = KHZ2PICOS(rate / 1000);
 349         }
 350
 351         mutex_lock(&jzfb->lock);
 352         if (!jzfb->is_enabled)
 353                 clk_enable(jzfb->ldclk);
 354         else
 355                 ctrl |= JZ_LCD_CTRL_ENABLE;
 356
 357         switch (pdata->lcd_type) {
 358         case JZ_LCD_TYPE_SPECIAL_TFT_1:
 359         case JZ_LCD_TYPE_SPECIAL_TFT_2:
 360         case JZ_LCD_TYPE_SPECIAL_TFT_3:
 361                 writel(pdata->special_tft_config.spl, jzfb->base + JZ_REG_LCD_SPL);
 362                 writel(pdata->special_tft_config.cls, jzfb->base + JZ_REG_LCD_CLS);
 363                 writel(pdata->special_tft_config.ps, jzfb->base + JZ_REG_LCD_PS);
 364                 writel(pdata->special_tft_config.ps, jzfb->base + JZ_REG_LCD_REV);
 365                 break;
 366         default:
 367                 cfg |= JZ_LCD_CFG_PS_DISABLE;
 368                 cfg |= JZ_LCD_CFG_CLS_DISABLE;
 369                 cfg |= JZ_LCD_CFG_SPL_DISABLE;
 370                 cfg |= JZ_LCD_CFG_REV_DISABLE;
 371                 break;
 372         }
 373
 374         writel(mode->hsync_len, jzfb->base + JZ_REG_LCD_HSYNC);
 375         writel(mode->vsync_len, jzfb->base + JZ_REG_LCD_VSYNC);
 376
 377         writel((ht << 16) | vt, jzfb->base + JZ_REG_LCD_VAT);
 378
 379         writel((hds << 16) | hde, jzfb->base + JZ_REG_LCD_DAH);
 380         writel((vds << 16) | vde, jzfb->base + JZ_REG_LCD_DAV);
 381
 382         writel(cfg, jzfb->base + JZ_REG_LCD_CFG);
 383
 384         writel(ctrl, jzfb->base + JZ_REG_LCD_CTRL);
 385
 386         if (!jzfb->is_enabled)
 387                 clk_disable_unprepare(jzfb->ldclk);
 388
 389         mutex_unlock(&jzfb->lock);
 390
 391         clk_set_rate(jzfb->lpclk, rate);
 392         clk_set_rate(jzfb->ldclk, rate * 3);
 393
 394         return 0;
 395 }
 396
 397 static void jzfb_enable(struct jzfb *jzfb)
 398 {
 399         uint32_t ctrl;
 400
 401         clk_prepare_enable(jzfb->ldclk);
 402
 403         pinctrl_pm_select_default_state(&jzfb->pdev->dev);
 404
 405         writel(0, jzfb->base + JZ_REG_LCD_STATE);
 406
 407         writel(jzfb->framedesc->next, jzfb->base + JZ_REG_LCD_DA0);
 408
 409         ctrl = readl(jzfb->base + JZ_REG_LCD_CTRL);
 410         ctrl |= JZ_LCD_CTRL_ENABLE;
 411         ctrl &= ~JZ_LCD_CTRL_DISABLE;
 412         writel(ctrl, jzfb->base + JZ_REG_LCD_CTRL);
 413 }
 414
 415 static void jzfb_disable(struct jzfb *jzfb)
 416 {
 417         uint32_t ctrl;
 418
 419         ctrl = readl(jzfb->base + JZ_REG_LCD_CTRL);
 420         ctrl |= JZ_LCD_CTRL_DISABLE;
 421         writel(ctrl, jzfb->base + JZ_REG_LCD_CTRL);
 422         do {
 423                 ctrl = readl(jzfb->base + JZ_REG_LCD_STATE);
 424         } while (!(ctrl & JZ_LCD_STATE_DISABLED));
 425
 426         pinctrl_pm_select_sleep_state(&jzfb->pdev->dev);
 427
 428         clk_disable_unprepare(jzfb->ldclk);
 429 }
 430
 431 static int jzfb_blank(int blank_mode, struct fb_info *info)
 432 {
 433         struct jzfb *jzfb = info->par;
 434
 435         switch (blank_mode) {
 436         case FB_BLANK_UNBLANK:
 437                 mutex_lock(&jzfb->lock);
 438                 if (jzfb->is_enabled) {
 439                         mutex_unlock(&jzfb->lock);
 440                         return 0;
 441                 }
 442
 443                 jzfb_enable(jzfb);
 444                 jzfb->is_enabled = 1;
 445
 446                 mutex_unlock(&jzfb->lock);
 447                 break;
 448         default:
 449                 mutex_lock(&jzfb->lock);
 450                 if (!jzfb->is_enabled) {
 451                         mutex_unlock(&jzfb->lock);
 452                         return 0;
 453                 }
 454
 455                 jzfb_disable(jzfb);
 456                 jzfb->is_enabled = 0;
 457
 458                 mutex_unlock(&jzfb->lock);
 459                 break;
 460         }
 461
 462         return 0;
 463 }
 464
 465 static int jzfb_alloc_devmem(struct jzfb *jzfb)
 466 {
 467         int max_videosize = 0;
 468         struct fb_videomode *mode = jzfb->pdata->modes;
 469         void *page;
 470         int i;
 471
 472         for (i = 0; i < jzfb->pdata->num_modes; ++mode, ++i) {
 473                 if (max_videosize < mode->xres * mode->yres)
 474                         max_videosize = mode->xres * mode->yres;
 475         }
 476
 477         max_videosize *= jzfb_get_controller_bpp(jzfb) >> 3;
 478
 479         jzfb->framedesc = dma_alloc_coherent(&jzfb->pdev->dev,
 480                                         sizeof(*jzfb->framedesc),
 481                                         &jzfb->framedesc_phys, GFP_KERNEL);
 482
 483         if (!jzfb->framedesc)
 484                 return -ENOMEM;
 485
 486         jzfb->vidmem_size = PAGE_ALIGN(max_videosize);
 487         jzfb->vidmem = dma_alloc_coherent(&jzfb->pdev->dev,
 488                                         jzfb->vidmem_size,
 489                                         &jzfb->vidmem_phys, GFP_KERNEL);
 490
 491         if (!jzfb->vidmem)
 492                 goto err_free_framedesc;
 493
 494         for (page = jzfb->vidmem;
 495                  page < jzfb->vidmem + PAGE_ALIGN(jzfb->vidmem_size);
 496                  page += PAGE_SIZE) {
 497                 SetPageReserved(virt_to_page(page));
 498         }
 499
 500         jzfb->framedesc->next = jzfb->framedesc_phys;
 501         jzfb->framedesc->addr = jzfb->vidmem_phys;
 502         jzfb->framedesc->id = 0xdeafbead;
 503         jzfb->framedesc->cmd = 0;
 504         jzfb->framedesc->cmd |= max_videosize / 4;
 505
 506         return 0;
 507
 508 err_free_framedesc:
 509         dma_free_coherent(&jzfb->pdev->dev, sizeof(*jzfb->framedesc),
 510                                 jzfb->framedesc, jzfb->framedesc_phys);
 511         return -ENOMEM;
 512 }
 513
 514 static void jzfb_free_devmem(struct jzfb *jzfb)
 515 {
 516         dma_free_coherent(&jzfb->pdev->dev, jzfb->vidmem_size,
 517                                 jzfb->vidmem, jzfb->vidmem_phys);
 518         dma_free_coherent(&jzfb->pdev->dev, sizeof(*jzfb->framedesc),
 519                                 jzfb->framedesc, jzfb->framedesc_phys);
 520 }
 521
 522 static struct  fb_ops jzfb_ops = {
 523         .owner = THIS_MODULE,
 524         .fb_check_var = jzfb_check_var,
 525         .fb_set_par = jzfb_set_par,
 526         .fb_blank = jzfb_blank,
 527         .fb_fillrect    = sys_fillrect,
 528         .fb_copyarea    = sys_copyarea,
 529         .fb_imageblit   = sys_imageblit,
 530         .fb_setcolreg = jzfb_setcolreg,
 531 };
 532
 533 static int jzfb_probe(struct platform_device *pdev)
 534 {
 535         int ret;
 536         struct jzfb *jzfb;
 537         struct fb_info *fb;
 538         struct jz4740_fb_platform_data *pdata = pdev->dev.platform_data;
 539         struct resource *mem;
 540
 541         if (!pdata) {
 542                 dev_err(&pdev->dev, "Missing platform data\n");
 543                 return -ENXIO;
 544         }
 545
 546         fb = framebuffer_alloc(sizeof(struct jzfb), &pdev->dev);
 547         if (!fb) {
 548                 dev_err(&pdev->dev, "Failed to allocate framebuffer device\n");
 549                 return -ENOMEM;
 550         }
 551
 552         fb->fbops = &jzfb_ops;
 553         fb->flags = FBINFO_DEFAULT;
 554
 555         jzfb = fb->par;
 556         jzfb->pdev = pdev;
 557         jzfb->pdata = pdata;
 558
 559         jzfb->ldclk = devm_clk_get(&pdev->dev, "lcd");
 560         if (IS_ERR(jzfb->ldclk)) {
 561                 ret = PTR_ERR(jzfb->ldclk);
 562                 dev_err(&pdev->dev, "Failed to get lcd clock: %d\n", ret);
 563                 goto err_framebuffer_release;
 564         }
 565
 566         jzfb->lpclk = devm_clk_get(&pdev->dev, "lcd_pclk");
 567         if (IS_ERR(jzfb->lpclk)) {
 568                 ret = PTR_ERR(jzfb->lpclk);
 569                 dev_err(&pdev->dev, "Failed to get lcd pixel clock: %d\n", ret);
 570                 goto err_framebuffer_release;
 571         }
 572
 573         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 574         jzfb->base = devm_ioremap_resource(&pdev->dev, mem);
 575         if (IS_ERR(jzfb->base)) {
 576                 ret = PTR_ERR(jzfb->base);
 577                 goto err_framebuffer_release;
 578         }
 579
 580         platform_set_drvdata(pdev, jzfb);
 581
 582         mutex_init(&jzfb->lock);
 583
 584         fb_videomode_to_modelist(pdata->modes, pdata->num_modes,
 585                                  &fb->modelist);
 586         fb_videomode_to_var(&fb->var, pdata->modes);
 587         fb->var.bits_per_pixel = pdata->bpp;
 588         jzfb_check_var(&fb->var, fb);
 589
 590         ret = jzfb_alloc_devmem(jzfb);
 591         if (ret) {
 592                 dev_err(&pdev->dev, "Failed to allocate video memory\n");
 593                 goto err_framebuffer_release;
 594         }
 595
 596         fb->fix = jzfb_fix;
 597         fb->fix.line_length = fb->var.bits_per_pixel * fb->var.xres / 8;
 598         fb->fix.mmio_start = mem->start;
 599         fb->fix.mmio_len = resource_size(mem);
 600         fb->fix.smem_start = jzfb->vidmem_phys;
 601         fb->fix.smem_len =  fb->fix.line_length * fb->var.yres;
 602         fb->screen_base = jzfb->vidmem;
 603         fb->pseudo_palette = jzfb->pseudo_palette;
 604
 605         fb_alloc_cmap(&fb->cmap, 256, 0);
 606
 607         clk_prepare_enable(jzfb->ldclk);
 608         jzfb->is_enabled = 1;
 609
 610         writel(jzfb->framedesc->next, jzfb->base + JZ_REG_LCD_DA0);
 611
 612         fb->mode = NULL;
 613         jzfb_set_par(fb);
 614
 615         ret = register_framebuffer(fb);
 616         if (ret) {
 617                 dev_err(&pdev->dev, "Failed to register framebuffer: %d\n", ret);
 618                 goto err_free_devmem;
 619         }
 620
 621         jzfb->fb = fb;
 622
 623         return 0;
 624
 625 err_free_devmem:
 626         fb_dealloc_cmap(&fb->cmap);
 627         jzfb_free_devmem(jzfb);
 628 err_framebuffer_release:
 629         framebuffer_release(fb);
 630         return ret;
 631 }
 632
 633 static int jzfb_remove(struct platform_device *pdev)
 634 {
 635         struct jzfb *jzfb = platform_get_drvdata(pdev);
 636
 637         jzfb_blank(FB_BLANK_POWERDOWN, jzfb->fb);
 638
 639         fb_dealloc_cmap(&jzfb->fb->cmap);
 640         jzfb_free_devmem(jzfb);
 641
 642         framebuffer_release(jzfb->fb);
 643
 644         return 0;
 645 }
 646
 647 #ifdef CONFIG_PM
 648
 649 static int jzfb_suspend(struct device *dev)
 650 {
 651         struct jzfb *jzfb = dev_get_drvdata(dev);
 652
 653         console_lock();
 654         fb_set_suspend(jzfb->fb, 1);
 655         console_unlock();
 656
 657         mutex_lock(&jzfb->lock);
 658         if (jzfb->is_enabled)
 659                 jzfb_disable(jzfb);
 660         mutex_unlock(&jzfb->lock);
 661
 662         return 0;
 663 }
 664
 665 static int jzfb_resume(struct device *dev)
 666 {
 667         struct jzfb *jzfb = dev_get_drvdata(dev);
 668         clk_prepare_enable(jzfb->ldclk);
 669
 670         mutex_lock(&jzfb->lock);
 671         if (jzfb->is_enabled)
 672                 jzfb_enable(jzfb);
 673         mutex_unlock(&jzfb->lock);
 674
 675         console_lock();
 676         fb_set_suspend(jzfb->fb, 0);
 677         console_unlock();
 678
 679         return 0;
 680 }
 681
 682 static const struct dev_pm_ops jzfb_pm_ops = {
 683         .suspend        = jzfb_suspend,
 684         .resume         = jzfb_resume,
 685         .poweroff       = jzfb_suspend,
 686         .restore        = jzfb_resume,
 687 };
 688
 689 #define JZFB_PM_OPS (&jzfb_pm_ops)
 690
 691 #else
 692 #define JZFB_PM_OPS NULL
 693 #endif
 694
 695 static struct platform_driver jzfb_driver = {
 696         .probe = jzfb_probe,
 697         .remove = jzfb_remove,
 698         .driver = {
 699                 .name = "jz4740-fb",
 700                 .pm = JZFB_PM_OPS,
 701         },
 702 };
 703 module_platform_driver(jzfb_driver);
 704
 705 MODULE_LICENSE("GPL");
 706 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 707 MODULE_DESCRIPTION("JZ4740 SoC LCD framebuffer driver");
 708 MODULE_ALIAS("platform:jz4740-fb");