drivers/video/sh_mobile_lcdcfb.c

   1 /*
   2  * SuperH Mobile LCDC Framebuffer
   3  *
   4  * Copyright (c) 2008 Magnus Damm
   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
   8  * for more details.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/delay.h>
  14 #include <linux/mm.h>
  15 #include <linux/fb.h>
  16 #include <linux/clk.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/dma-mapping.h>
  19 #include <asm/sh_mobile_lcdc.h>
  20
  21 #define PALETTE_NR 16
  22
  23 struct sh_mobile_lcdc_priv;
  24 struct sh_mobile_lcdc_chan {
  25         struct sh_mobile_lcdc_priv *lcdc;
  26         unsigned long *reg_offs;
  27         unsigned long ldmt1r_value;
  28         unsigned long enabled; /* ME and SE in LDCNT2R */
  29         struct sh_mobile_lcdc_chan_cfg cfg;
  30         u32 pseudo_palette[PALETTE_NR];
  31         struct fb_info info;
  32         dma_addr_t dma_handle;
  33 };
  34
  35 struct sh_mobile_lcdc_priv {
  36         void __iomem *base;
  37         struct clk *clk;
  38         unsigned long lddckr;
  39         struct sh_mobile_lcdc_chan ch[2];
  40 };
  41
  42 /* shared registers */
  43 #define _LDDCKR 0x410
  44 #define _LDDCKSTPR 0x414
  45 #define _LDINTR 0x468
  46 #define _LDSR 0x46c
  47 #define _LDCNT1R 0x470
  48 #define _LDCNT2R 0x474
  49 #define _LDDDSR 0x47c
  50 #define _LDDWD0R 0x800
  51 #define _LDDRDR 0x840
  52 #define _LDDWAR 0x900
  53 #define _LDDRAR 0x904
  54
  55 /* per-channel registers */
  56 enum { LDDCKPAT1R, LDDCKPAT2R, LDMT1R, LDMT2R, LDMT3R, LDDFR, LDSM1R,
  57        LDSA1R, LDMLSR, LDHCNR, LDHSYNR, LDVLNR, LDVSYNR, LDPMR };
  58
  59 static unsigned long lcdc_offs_mainlcd[] = {
  60         [LDDCKPAT1R] = 0x400,
  61         [LDDCKPAT2R] = 0x404,
  62         [LDMT1R] = 0x418,
  63         [LDMT2R] = 0x41c,
  64         [LDMT3R] = 0x420,
  65         [LDDFR] = 0x424,
  66         [LDSM1R] = 0x428,
  67         [LDSA1R] = 0x430,
  68         [LDMLSR] = 0x438,
  69         [LDHCNR] = 0x448,
  70         [LDHSYNR] = 0x44c,
  71         [LDVLNR] = 0x450,
  72         [LDVSYNR] = 0x454,
  73         [LDPMR] = 0x460,
  74 };
  75
  76 static unsigned long lcdc_offs_sublcd[] = {
  77         [LDDCKPAT1R] = 0x408,
  78         [LDDCKPAT2R] = 0x40c,
  79         [LDMT1R] = 0x600,
  80         [LDMT2R] = 0x604,
  81         [LDMT3R] = 0x608,
  82         [LDDFR] = 0x60c,
  83         [LDSM1R] = 0x610,
  84         [LDSA1R] = 0x618,
  85         [LDMLSR] = 0x620,
  86         [LDHCNR] = 0x624,
  87         [LDHSYNR] = 0x628,
  88         [LDVLNR] = 0x62c,
  89         [LDVSYNR] = 0x630,
  90         [LDPMR] = 0x63c,
  91 };
  92
  93 #define START_LCDC      0x00000001
  94 #define LCDC_RESET      0x00000100
  95 #define DISPLAY_BEU     0x00000008
  96 #define LCDC_ENABLE     0x00000001
  97
  98 static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
  99                             int reg_nr, unsigned long data)
 100 {
 101         iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]);
 102 }
 103
 104 static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan,
 105                                     int reg_nr)
 106 {
 107         return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]);
 108 }
 109
 110 static void lcdc_write(struct sh_mobile_lcdc_priv *priv,
 111                        unsigned long reg_offs, unsigned long data)
 112 {
 113         iowrite32(data, priv->base + reg_offs);
 114 }
 115
 116 static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv,
 117                                unsigned long reg_offs)
 118 {
 119         return ioread32(priv->base + reg_offs);
 120 }
 121
 122 static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv,
 123                           unsigned long reg_offs,
 124                           unsigned long mask, unsigned long until)
 125 {
 126         while ((lcdc_read(priv, reg_offs) & mask) != until)
 127                 cpu_relax();
 128 }
 129
 130 static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan)
 131 {
 132         return chan->cfg.chan == LCDC_CHAN_SUBLCD;
 133 }
 134
 135 static void lcdc_sys_write_index(void *handle, unsigned long data)
 136 {
 137         struct sh_mobile_lcdc_chan *ch = handle;
 138
 139         lcdc_write(ch->lcdc, _LDDWD0R, data | 0x10000000);
 140         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
 141         lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
 142 }
 143
 144 static void lcdc_sys_write_data(void *handle, unsigned long data)
 145 {
 146         struct sh_mobile_lcdc_chan *ch = handle;
 147
 148         lcdc_write(ch->lcdc, _LDDWD0R, data | 0x11000000);
 149         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
 150         lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
 151 }
 152
 153 static unsigned long lcdc_sys_read_data(void *handle)
 154 {
 155         struct sh_mobile_lcdc_chan *ch = handle;
 156
 157         lcdc_write(ch->lcdc, _LDDRDR, 0x01000000);
 158         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
 159         lcdc_write(ch->lcdc, _LDDRAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
 160         udelay(1);
 161
 162         return lcdc_read(ch->lcdc, _LDDRDR) & 0xffff;
 163 }
 164
 165 struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = {
 166         lcdc_sys_write_index,
 167         lcdc_sys_write_data,
 168         lcdc_sys_read_data,
 169 };
 170
 171 static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
 172                                       int start)
 173 {
 174         unsigned long tmp = lcdc_read(priv, _LDCNT2R);
 175         int k;
 176
 177         /* start or stop the lcdc */
 178         if (start)
 179                 lcdc_write(priv, _LDCNT2R, tmp | START_LCDC);
 180         else
 181                 lcdc_write(priv, _LDCNT2R, tmp & ~START_LCDC);
 182
 183         /* wait until power is applied/stopped on all channels */
 184         for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
 185                 if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled)
 186                         while (1) {
 187                                 tmp = lcdc_read_chan(&priv->ch[k], LDPMR) & 3;
 188                                 if (start && tmp == 3)
 189                                         break;
 190                                 if (!start && tmp == 0)
 191                                         break;
 192                                 cpu_relax();
 193                         }
 194
 195         if (!start)
 196                 lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */
 197 }
 198
 199 static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
 200 {
 201         struct sh_mobile_lcdc_chan *ch;
 202         struct fb_videomode *lcd_cfg;
 203         struct sh_mobile_lcdc_board_cfg *board_cfg;
 204         unsigned long tmp;
 205         int k, m;
 206         int ret = 0;
 207
 208         /* reset */
 209         lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LCDC_RESET);
 210         lcdc_wait_bit(priv, _LDCNT2R, LCDC_RESET, 0);
 211
 212         /* enable LCDC channels */
 213         tmp = lcdc_read(priv, _LDCNT2R);
 214         tmp |= priv->ch[0].enabled;
 215         tmp |= priv->ch[1].enabled;
 216         lcdc_write(priv, _LDCNT2R, tmp);
 217
 218         /* read data from external memory, avoid using the BEU for now */
 219         lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) & ~DISPLAY_BEU);
 220
 221         /* stop the lcdc first */
 222         sh_mobile_lcdc_start_stop(priv, 0);
 223
 224         /* configure clocks */
 225         tmp = priv->lddckr;
 226         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 227                 ch = &priv->ch[k];
 228
 229                 if (!priv->ch[k].enabled)
 230                         continue;
 231
 232                 m = ch->cfg.clock_divider;
 233                 if (!m)
 234                         continue;
 235
 236                 if (m == 1)
 237                         m = 1 << 6;
 238                 tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0);
 239
 240                 lcdc_write_chan(ch, LDDCKPAT1R, 0x00000000);
 241                 lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);
 242         }
 243
 244         lcdc_write(priv, _LDDCKR, tmp);
 245
 246         /* start dotclock again */
 247         lcdc_write(priv, _LDDCKSTPR, 0);
 248         lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0);
 249
 250         /* interrupts are disabled */
 251         lcdc_write(priv, _LDINTR, 0);
 252
 253         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 254                 ch = &priv->ch[k];
 255                 lcd_cfg = &ch->cfg.lcd_cfg;
 256
 257                 if (!ch->enabled)
 258                         continue;
 259
 260                 tmp = ch->ldmt1r_value;
 261                 tmp |= (lcd_cfg->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1 << 28;
 262                 tmp |= (lcd_cfg->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1 << 27;
 263                 lcdc_write_chan(ch, LDMT1R, tmp);
 264
 265                 /* setup SYS bus */
 266                 lcdc_write_chan(ch, LDMT2R, ch->cfg.sys_bus_cfg.ldmt2r);
 267                 lcdc_write_chan(ch, LDMT3R, ch->cfg.sys_bus_cfg.ldmt3r);
 268
 269                 /* horizontal configuration */
 270                 tmp = lcd_cfg->xres + lcd_cfg->hsync_len;
 271                 tmp += lcd_cfg->left_margin;
 272                 tmp += lcd_cfg->right_margin;
 273                 tmp /= 8; /* HTCN */
 274                 tmp |= (lcd_cfg->xres / 8) << 16; /* HDCN */
 275                 lcdc_write_chan(ch, LDHCNR, tmp);
 276
 277                 tmp = lcd_cfg->xres;
 278                 tmp += lcd_cfg->right_margin;
 279                 tmp /= 8; /* HSYNP */
 280                 tmp |= (lcd_cfg->hsync_len / 8) << 16; /* HSYNW */
 281                 lcdc_write_chan(ch, LDHSYNR, tmp);
 282
 283                 /* power supply */
 284                 lcdc_write_chan(ch, LDPMR, 0);
 285
 286                 /* vertical configuration */
 287                 tmp = lcd_cfg->yres + lcd_cfg->vsync_len;
 288                 tmp += lcd_cfg->upper_margin;
 289                 tmp += lcd_cfg->lower_margin; /* VTLN */
 290                 tmp |= lcd_cfg->yres << 16; /* VDLN */
 291                 lcdc_write_chan(ch, LDVLNR, tmp);
 292
 293                 tmp = lcd_cfg->yres;
 294                 tmp += lcd_cfg->lower_margin; /* VSYNP */
 295                 tmp |= lcd_cfg->vsync_len << 16; /* VSYNW */
 296                 lcdc_write_chan(ch, LDVSYNR, tmp);
 297
 298                 board_cfg = &ch->cfg.board_cfg;
 299                 if (board_cfg->setup_sys)
 300                         ret = board_cfg->setup_sys(board_cfg->board_data, ch,
 301                                                    &sh_mobile_lcdc_sys_bus_ops);
 302                 if (ret)
 303                         return ret;
 304         }
 305
 306         /* --- display_lcdc_data() --- */
 307         lcdc_write(priv, _LDINTR, 0x00000f00);
 308
 309         /* word and long word swap */
 310         lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 6);
 311
 312         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 313                 ch = &priv->ch[k];
 314
 315                 if (!priv->ch[k].enabled)
 316                         continue;
 317
 318                 /* set bpp format in PKF[4:0] */
 319                 tmp = lcdc_read_chan(ch, LDDFR);
 320                 tmp &= ~(0x0001001f);
 321                 tmp |= (priv->ch[k].info.var.bits_per_pixel == 16) ? 3 : 0;
 322                 lcdc_write_chan(ch, LDDFR, tmp);
 323
 324                 /* point out our frame buffer */
 325                 lcdc_write_chan(ch, LDSA1R, ch->info.fix.smem_start);
 326
 327                 /* set line size */
 328                 lcdc_write_chan(ch, LDMLSR, ch->info.fix.line_length);
 329
 330                 /* continuous read mode */
 331                 lcdc_write_chan(ch, LDSM1R, 0);
 332         }
 333
 334         /* display output */
 335         lcdc_write(priv, _LDCNT1R, LCDC_ENABLE);
 336
 337         /* start the lcdc */
 338         sh_mobile_lcdc_start_stop(priv, 1);
 339
 340         /* tell the board code to enable the panel */
 341         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 342                 ch = &priv->ch[k];
 343                 board_cfg = &ch->cfg.board_cfg;
 344                 if (board_cfg->display_on)
 345                         board_cfg->display_on(board_cfg->board_data);
 346         }
 347
 348         return 0;
 349 }
 350
 351 static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
 352 {
 353         struct sh_mobile_lcdc_chan *ch;
 354         struct sh_mobile_lcdc_board_cfg *board_cfg;
 355         int k;
 356
 357         /* tell the board code to disable the panel */
 358         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 359                 ch = &priv->ch[k];
 360                 board_cfg = &ch->cfg.board_cfg;
 361                 if (board_cfg->display_off)
 362                         board_cfg->display_off(board_cfg->board_data);
 363         }
 364
 365         /* stop the lcdc */
 366         sh_mobile_lcdc_start_stop(priv, 0);
 367 }
 368
 369 static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
 370 {
 371         int ifm, miftyp;
 372
 373         switch (ch->cfg.interface_type) {
 374         case RGB8: ifm = 0; miftyp = 0; break;
 375         case RGB9: ifm = 0; miftyp = 4; break;
 376         case RGB12A: ifm = 0; miftyp = 5; break;
 377         case RGB12B: ifm = 0; miftyp = 6; break;
 378         case RGB16: ifm = 0; miftyp = 7; break;
 379         case RGB18: ifm = 0; miftyp = 10; break;
 380         case RGB24: ifm = 0; miftyp = 11; break;
 381         case SYS8A: ifm = 1; miftyp = 0; break;
 382         case SYS8B: ifm = 1; miftyp = 1; break;
 383         case SYS8C: ifm = 1; miftyp = 2; break;
 384         case SYS8D: ifm = 1; miftyp = 3; break;
 385         case SYS9: ifm = 1; miftyp = 4; break;
 386         case SYS12: ifm = 1; miftyp = 5; break;
 387         case SYS16A: ifm = 1; miftyp = 7; break;
 388         case SYS16B: ifm = 1; miftyp = 8; break;
 389         case SYS16C: ifm = 1; miftyp = 9; break;
 390         case SYS18: ifm = 1; miftyp = 10; break;
 391         case SYS24: ifm = 1; miftyp = 11; break;
 392         default: goto bad;
 393         }
 394
 395         /* SUBLCD only supports SYS interface */
 396         if (lcdc_chan_is_sublcd(ch)) {
 397                 if (ifm == 0)
 398                         goto bad;
 399                 else
 400                         ifm = 0;
 401         }
 402
 403         ch->ldmt1r_value = (ifm << 12) | miftyp;
 404         return 0;
 405  bad:
 406         return -EINVAL;
 407 }
 408
 409 static int sh_mobile_lcdc_setup_clocks(struct device *dev, int clock_source,
 410                                        struct sh_mobile_lcdc_priv *priv)
 411 {
 412         char *str;
 413         int icksel;
 414
 415         switch (clock_source) {
 416         case LCDC_CLK_BUS: str = "bus_clk"; icksel = 0; break;
 417         case LCDC_CLK_PERIPHERAL: str = "peripheral_clk"; icksel = 1; break;
 418         case LCDC_CLK_EXTERNAL: str = NULL; icksel = 2; break;
 419         default:
 420                 return -EINVAL;
 421         }
 422
 423         priv->lddckr = icksel << 16;
 424
 425         if (str) {
 426                 priv->clk = clk_get(dev, str);
 427                 if (IS_ERR(priv->clk)) {
 428                         dev_err(dev, "cannot get clock %s\n", str);
 429                         return PTR_ERR(priv->clk);
 430                 }
 431
 432                 clk_enable(priv->clk);
 433         }
 434
 435         return 0;
 436 }
 437
 438 static int sh_mobile_lcdc_setcolreg(u_int regno,
 439                                     u_int red, u_int green, u_int blue,
 440                                     u_int transp, struct fb_info *info)
 441 {
 442         u32 *palette = info->pseudo_palette;
 443
 444         if (regno >= PALETTE_NR)
 445                 return -EINVAL;
 446
 447         /* only FB_VISUAL_TRUECOLOR supported */
 448
 449         red >>= 16 - info->var.red.length;
 450         green >>= 16 - info->var.green.length;
 451         blue >>= 16 - info->var.blue.length;
 452         transp >>= 16 - info->var.transp.length;
 453
 454         palette[regno] = (red << info->var.red.offset) |
 455           (green << info->var.green.offset) |
 456           (blue << info->var.blue.offset) |
 457           (transp << info->var.transp.offset);
 458
 459         return 0;
 460 }
 461
 462 static struct fb_fix_screeninfo sh_mobile_lcdc_fix  = {
 463         .id =           "SH Mobile LCDC",
 464         .type =         FB_TYPE_PACKED_PIXELS,
 465         .visual =       FB_VISUAL_TRUECOLOR,
 466         .accel =        FB_ACCEL_NONE,
 467 };
 468
 469 static struct fb_ops sh_mobile_lcdc_ops = {
 470         .fb_setcolreg   = sh_mobile_lcdc_setcolreg,
 471         .fb_fillrect    = cfb_fillrect,
 472         .fb_copyarea    = cfb_copyarea,
 473         .fb_imageblit   = cfb_imageblit,
 474 };
 475
 476 static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp)
 477 {
 478         switch (bpp) {
 479         case 16: /* PKF[4:0] = 00011 - RGB 565 */
 480                 var->red.offset = 11;
 481                 var->red.length = 5;
 482                 var->green.offset = 5;
 483                 var->green.length = 6;
 484                 var->blue.offset = 0;
 485                 var->blue.length = 5;
 486                 var->transp.offset = 0;
 487                 var->transp.length = 0;
 488                 break;
 489
 490         case 32: /* PKF[4:0] = 00000 - RGB 888
 491                   * sh7722 pdf says 00RRGGBB but reality is GGBB00RR
 492                   * this may be because LDDDSR has word swap enabled..
 493                   */
 494                 var->red.offset = 0;
 495                 var->red.length = 8;
 496                 var->green.offset = 24;
 497                 var->green.length = 8;
 498                 var->blue.offset = 16;
 499                 var->blue.length = 8;
 500                 var->transp.offset = 0;
 501                 var->transp.length = 0;
 502                 break;
 503         default:
 504                 return -EINVAL;
 505         }
 506         var->bits_per_pixel = bpp;
 507         var->red.msb_right = 0;
 508         var->green.msb_right = 0;
 509         var->blue.msb_right = 0;
 510         var->transp.msb_right = 0;
 511         return 0;
 512 }
 513
 514 static int sh_mobile_lcdc_remove(struct platform_device *pdev);
 515
 516 static int __init sh_mobile_lcdc_probe(struct platform_device *pdev)
 517 {
 518         struct fb_info *info;
 519         struct sh_mobile_lcdc_priv *priv;
 520         struct sh_mobile_lcdc_info *pdata;
 521         struct sh_mobile_lcdc_chan_cfg *cfg;
 522         struct resource *res;
 523         int error;
 524         void *buf;
 525         int i, j;
 526
 527         if (!pdev->dev.platform_data) {
 528                 dev_err(&pdev->dev, "no platform data defined\n");
 529                 error = -EINVAL;
 530                 goto err0;
 531         }
 532
 533         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 534         if (res == NULL) {
 535                 dev_err(&pdev->dev, "cannot find IO resource\n");
 536                 error = -ENOENT;
 537                 goto err0;
 538         }
 539
 540         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 541         if (!priv) {
 542                 dev_err(&pdev->dev, "cannot allocate device data\n");
 543                 error = -ENOMEM;
 544                 goto err0;
 545         }
 546
 547         platform_set_drvdata(pdev, priv);
 548         pdata = pdev->dev.platform_data;
 549
 550         j = 0;
 551         for (i = 0; i < ARRAY_SIZE(pdata->ch); i++) {
 552                 priv->ch[j].lcdc = priv;
 553                 memcpy(&priv->ch[j].cfg, &pdata->ch[i], sizeof(pdata->ch[i]));
 554
 555                 error = sh_mobile_lcdc_check_interface(&priv->ch[i]);
 556                 if (error) {
 557                         dev_err(&pdev->dev, "unsupported interface type\n");
 558                         goto err1;
 559                 }
 560
 561                 switch (pdata->ch[i].chan) {
 562                 case LCDC_CHAN_MAINLCD:
 563                         priv->ch[j].enabled = 1 << 1;
 564                         priv->ch[j].reg_offs = lcdc_offs_mainlcd;
 565                         j++;
 566                         break;
 567                 case LCDC_CHAN_SUBLCD:
 568                         priv->ch[j].enabled = 1 << 2;
 569                         priv->ch[j].reg_offs = lcdc_offs_sublcd;
 570                         j++;
 571                         break;
 572                 }
 573         }
 574
 575         if (!j) {
 576                 dev_err(&pdev->dev, "no channels defined\n");
 577                 error = -EINVAL;
 578                 goto err1;
 579         }
 580
 581         error = sh_mobile_lcdc_setup_clocks(&pdev->dev,
 582                                             pdata->clock_source, priv);
 583         if (error) {
 584                 dev_err(&pdev->dev, "unable to setup clocks\n");
 585                 goto err1;
 586         }
 587
 588         priv->lddckr = pdata->lddckr;
 589         priv->base = ioremap_nocache(res->start, (res->end - res->start) + 1);
 590
 591         for (i = 0; i < j; i++) {
 592                 info = &priv->ch[i].info;
 593                 cfg = &priv->ch[i].cfg;
 594
 595                 info->fbops = &sh_mobile_lcdc_ops;
 596                 info->var.xres = info->var.xres_virtual = cfg->lcd_cfg.xres;
 597                 info->var.yres = info->var.yres_virtual = cfg->lcd_cfg.yres;
 598                 info->var.activate = FB_ACTIVATE_NOW;
 599                 error = sh_mobile_lcdc_set_bpp(&info->var, cfg->bpp);
 600                 if (error)
 601                         break;
 602
 603                 info->fix = sh_mobile_lcdc_fix;
 604                 info->fix.line_length = cfg->lcd_cfg.xres * (cfg->bpp / 8);
 605                 info->fix.smem_len = info->fix.line_length * cfg->lcd_cfg.yres;
 606
 607                 buf = dma_alloc_coherent(&pdev->dev, info->fix.smem_len,
 608                                          &priv->ch[i].dma_handle, GFP_KERNEL);
 609                 if (!buf) {
 610                         dev_err(&pdev->dev, "unable to allocate buffer\n");
 611                         error = -ENOMEM;
 612                         break;
 613                 }
 614
 615                 info->pseudo_palette = &priv->ch[i].pseudo_palette;
 616                 info->flags = FBINFO_FLAG_DEFAULT;
 617
 618                 error = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0);
 619                 if (error < 0) {
 620                         dev_err(&pdev->dev, "unable to allocate cmap\n");
 621                         dma_free_coherent(&pdev->dev, info->fix.smem_len,
 622                                           buf, priv->ch[i].dma_handle);
 623                         break;
 624                 }
 625
 626                 memset(buf, 0, info->fix.smem_len);
 627                 info->fix.smem_start = priv->ch[i].dma_handle;
 628                 info->screen_base = buf;
 629                 info->device = &pdev->dev;
 630         }
 631
 632         if (error)
 633                 goto err1;
 634
 635         error = sh_mobile_lcdc_start(priv);
 636         if (error) {
 637                 dev_err(&pdev->dev, "unable to start hardware\n");
 638                 goto err1;
 639         }
 640
 641         for (i = 0; i < j; i++) {
 642                 error = register_framebuffer(&priv->ch[i].info);
 643                 if (error < 0)
 644                         goto err1;
 645         }
 646
 647         for (i = 0; i < j; i++) {
 648                 info = &priv->ch[i].info;
 649                 dev_info(info->dev,
 650                          "registered %s/%s as %dx%d %dbpp.\n",
 651                          pdev->name,
 652                          (priv->ch[i].cfg.chan == LCDC_CHAN_MAINLCD) ?
 653                          "mainlcd" : "sublcd",
 654                          (int) priv->ch[i].cfg.lcd_cfg.xres,
 655                          (int) priv->ch[i].cfg.lcd_cfg.yres,
 656                          priv->ch[i].cfg.bpp);
 657         }
 658
 659         return 0;
 660  err1:
 661         sh_mobile_lcdc_remove(pdev);
 662  err0:
 663         return error;
 664 }
 665
 666 static int sh_mobile_lcdc_remove(struct platform_device *pdev)
 667 {
 668         struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
 669         struct fb_info *info;
 670         int i;
 671
 672         for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
 673                 if (priv->ch[i].info.dev)
 674                         unregister_framebuffer(&priv->ch[i].info);
 675
 676         sh_mobile_lcdc_stop(priv);
 677
 678         for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
 679                 info = &priv->ch[i].info;
 680
 681                 if (!info->device)
 682                         continue;
 683
 684                 dma_free_coherent(&pdev->dev, info->fix.smem_len,
 685                                   info->screen_base, priv->ch[i].dma_handle);
 686                 fb_dealloc_cmap(&info->cmap);
 687         }
 688
 689         if (priv->clk) {
 690                 clk_disable(priv->clk);
 691                 clk_put(priv->clk);
 692         }
 693
 694         if (priv->base)
 695                 iounmap(priv->base);
 696
 697         kfree(priv);
 698         return 0;
 699 }
 700
 701 static struct platform_driver sh_mobile_lcdc_driver = {
 702         .driver         = {
 703                 .name           = "sh_mobile_lcdc_fb",
 704                 .owner          = THIS_MODULE,
 705         },
 706         .probe          = sh_mobile_lcdc_probe,
 707         .remove         = sh_mobile_lcdc_remove,
 708 };
 709
 710 static int __init sh_mobile_lcdc_init(void)
 711 {
 712         return platform_driver_register(&sh_mobile_lcdc_driver);
 713 }
 714
 715 static void __exit sh_mobile_lcdc_exit(void)
 716 {
 717         platform_driver_unregister(&sh_mobile_lcdc_driver);
 718 }
 719
 720 module_init(sh_mobile_lcdc_init);
 721 module_exit(sh_mobile_lcdc_exit);
 722
 723 MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver");
 724 MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
 725 MODULE_LICENSE("GPL v2");