drivers/video/sh7760fb.c

   1 /*
   2  * SH7760/SH7763 LCDC Framebuffer driver.
   3  *
   4  * (c) 2006-2008 MSC Vertriebsges.m.b.H.,
   5  *             Manuel Lauss <mano@roarinelk.homelinux.net>
   6  * (c) 2008 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
   7  *
   8  *  This file is subject to the terms and conditions of the GNU General
   9  *  Public License.  See the file COPYING in the main directory of this
  10  *  archive for more details.
  11  *
  12  * PLEASE HAVE A LOOK AT Documentation/fb/sh7760fb.txt!
  13  *
  14  * Thanks to Siegfried Schaefer <s.schaefer at schaefer-edv.de>
  15  *     for his original source and testing!
  16  *
  17  * sh7760_setcolreg get from drivers/video/sh_mobile_lcdcfb.c
  18  */
  19
  20 #include <linux/completion.h>
  21 #include <linux/delay.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/fb.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/io.h>
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/platform_device.h>
  29
  30 #include <asm/sh7760fb.h>
  31
  32 struct sh7760fb_par {
  33         void __iomem *base;
  34         int irq;
  35
  36         struct sh7760fb_platdata *pd;   /* display information */
  37
  38         dma_addr_t fbdma;       /* physical address */
  39
  40         int rot;                /* rotation enabled? */
  41
  42         u32 pseudo_palette[16];
  43
  44         struct platform_device *dev;
  45         struct resource *ioarea;
  46         struct completion vsync;        /* vsync irq event */
  47 };
  48
  49 static irqreturn_t sh7760fb_irq(int irq, void *data)
  50 {
  51         struct completion *c = data;
  52
  53         complete(c);
  54
  55         return IRQ_HANDLED;
  56 }
  57
  58 /* wait_for_lps - wait until power supply has reached a certain state. */
  59 static int wait_for_lps(struct sh7760fb_par *par, int val)
  60 {
  61         int i = 100;
  62         while (--i && ((ioread16(par->base + LDPMMR) & 3) != val))
  63                 msleep(1);
  64
  65         if (i <= 0)
  66                 return -ETIMEDOUT;
  67
  68         return 0;
  69 }
  70
  71 /* en/disable the LCDC */
  72 static int sh7760fb_blank(int blank, struct fb_info *info)
  73 {
  74         struct sh7760fb_par *par = info->par;
  75         struct sh7760fb_platdata *pd = par->pd;
  76         unsigned short cntr = ioread16(par->base + LDCNTR);
  77         unsigned short intr = ioread16(par->base + LDINTR);
  78         int lps;
  79
  80         if (blank == FB_BLANK_UNBLANK) {
  81                 intr |= VINT_START;
  82                 cntr = LDCNTR_DON2 | LDCNTR_DON;
  83                 lps = 3;
  84         } else {
  85                 intr &= ~VINT_START;
  86                 cntr = LDCNTR_DON2;
  87                 lps = 0;
  88         }
  89
  90         if (pd->blank)
  91                 pd->blank(blank);
  92
  93         iowrite16(intr, par->base + LDINTR);
  94         iowrite16(cntr, par->base + LDCNTR);
  95
  96         return wait_for_lps(par, lps);
  97 }
  98
  99 static int sh7760_setcolreg (u_int regno,
 100         u_int red, u_int green, u_int blue,
 101         u_int transp, struct fb_info *info)
 102 {
 103         u32 *palette = info->pseudo_palette;
 104
 105         if (regno >= 16)
 106                 return -EINVAL;
 107
 108         /* only FB_VISUAL_TRUECOLOR supported */
 109
 110         red >>= 16 - info->var.red.length;
 111         green >>= 16 - info->var.green.length;
 112         blue >>= 16 - info->var.blue.length;
 113         transp >>= 16 - info->var.transp.length;
 114
 115         palette[regno] = (red << info->var.red.offset) |
 116                 (green << info->var.green.offset) |
 117                 (blue << info->var.blue.offset) |
 118                 (transp << info->var.transp.offset);
 119
 120         return 0;
 121 }
 122
 123 static void encode_fix(struct fb_fix_screeninfo *fix, struct fb_info *info,
 124                        unsigned long stride)
 125 {
 126         memset(fix, 0, sizeof(struct fb_fix_screeninfo));
 127         strcpy(fix->id, "sh7760-lcdc");
 128
 129         fix->smem_start = (unsigned long)info->screen_base;
 130         fix->smem_len = info->screen_size;
 131
 132         fix->line_length = stride;
 133 }
 134
 135 static int sh7760fb_get_color_info(struct device *dev,
 136                                    u16 lddfr, int *bpp, int *gray)
 137 {
 138         int lbpp, lgray;
 139
 140         lgray = lbpp = 0;
 141
 142         switch (lddfr & LDDFR_COLOR_MASK) {
 143         case LDDFR_1BPP_MONO:
 144                 lgray = 1;
 145                 lbpp = 1;
 146                 break;
 147         case LDDFR_2BPP_MONO:
 148                 lgray = 1;
 149                 lbpp = 2;
 150                 break;
 151         case LDDFR_4BPP_MONO:
 152                 lgray = 1;
 153         case LDDFR_4BPP:
 154                 lbpp = 4;
 155                 break;
 156         case LDDFR_6BPP_MONO:
 157                 lgray = 1;
 158         case LDDFR_8BPP:
 159                 lbpp = 8;
 160                 break;
 161         case LDDFR_16BPP_RGB555:
 162         case LDDFR_16BPP_RGB565:
 163                 lbpp = 16;
 164                 lgray = 0;
 165                 break;
 166         default:
 167                 dev_dbg(dev, "unsupported LDDFR bit depth.\n");
 168                 return -EINVAL;
 169         }
 170
 171         if (bpp)
 172                 *bpp = lbpp;
 173         if (gray)
 174                 *gray = lgray;
 175
 176         return 0;
 177 }
 178
 179 static int sh7760fb_check_var(struct fb_var_screeninfo *var,
 180                               struct fb_info *info)
 181 {
 182         struct fb_fix_screeninfo *fix = &info->fix;
 183         struct sh7760fb_par *par = info->par;
 184         int ret, bpp;
 185
 186         /* get color info from register value */
 187         ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
 188         if (ret)
 189                 return ret;
 190
 191         var->bits_per_pixel = bpp;
 192
 193         if ((var->grayscale) && (var->bits_per_pixel == 1))
 194                 fix->visual = FB_VISUAL_MONO10;
 195         else if (var->bits_per_pixel >= 15)
 196                 fix->visual = FB_VISUAL_TRUECOLOR;
 197         else
 198                 fix->visual = FB_VISUAL_PSEUDOCOLOR;
 199
 200         /* TODO: add some more validation here */
 201         return 0;
 202 }
 203
 204 /*
 205  * sh7760fb_set_par - set videomode.
 206  *
 207  * NOTE: The rotation, grayscale and DSTN codepaths are
 208  *     totally untested!
 209  */
 210 static int sh7760fb_set_par(struct fb_info *info)
 211 {
 212         struct sh7760fb_par *par = info->par;
 213         struct fb_videomode *vm = par->pd->def_mode;
 214         unsigned long sbase, dstn_off, ldsarl, stride;
 215         unsigned short hsynp, hsynw, htcn, hdcn;
 216         unsigned short vsynp, vsynw, vtln, vdln;
 217         unsigned short lddfr, ldmtr;
 218         int ret, bpp, gray;
 219
 220         par->rot = par->pd->rotate;
 221
 222         /* rotate only works with xres <= 320 */
 223         if (par->rot && (vm->xres > 320)) {
 224                 dev_dbg(info->dev, "rotation disabled due to display size\n");
 225                 par->rot = 0;
 226         }
 227
 228         /* calculate LCDC reg vals from display parameters */
 229         hsynp = vm->right_margin + vm->xres;
 230         hsynw = vm->hsync_len;
 231         htcn = vm->left_margin + hsynp + hsynw;
 232         hdcn = vm->xres;
 233         vsynp = vm->lower_margin + vm->yres;
 234         vsynw = vm->vsync_len;
 235         vtln = vm->upper_margin + vsynp + vsynw;
 236         vdln = vm->yres;
 237
 238         /* get color info from register value */
 239         ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, &gray);
 240         if (ret)
 241                 return ret;
 242
 243         dev_dbg(info->dev, "%dx%d %dbpp %s (orientation %s)\n", hdcn,
 244                 vdln, bpp, gray ? "grayscale" : "color",
 245                 par->rot ? "rotated" : "normal");
 246
 247 #ifdef CONFIG_CPU_LITTLE_ENDIAN
 248         lddfr = par->pd->lddfr | (1 << 8);
 249 #else
 250         lddfr = par->pd->lddfr & ~(1 << 8);
 251 #endif
 252
 253         ldmtr = par->pd->ldmtr;
 254
 255         if (!(vm->sync & FB_SYNC_HOR_HIGH_ACT))
 256                 ldmtr |= LDMTR_CL1POL;
 257         if (!(vm->sync & FB_SYNC_VERT_HIGH_ACT))
 258                 ldmtr |= LDMTR_FLMPOL;
 259
 260         /* shut down LCDC before changing display parameters */
 261         sh7760fb_blank(FB_BLANK_POWERDOWN, info);
 262
 263         iowrite16(par->pd->ldickr, par->base + LDICKR); /* pixclock */
 264         iowrite16(ldmtr, par->base + LDMTR);    /* polarities */
 265         iowrite16(lddfr, par->base + LDDFR);    /* color/depth */
 266         iowrite16((par->rot ? 1 << 13 : 0), par->base + LDSMR); /* rotate */
 267         iowrite16(par->pd->ldpmmr, par->base + LDPMMR); /* Power Management */
 268         iowrite16(par->pd->ldpspr, par->base + LDPSPR); /* Power Supply Ctrl */
 269
 270         /* display resolution */
 271         iowrite16(((htcn >> 3) - 1) | (((hdcn >> 3) - 1) << 8),
 272                   par->base + LDHCNR);
 273         iowrite16(vdln - 1, par->base + LDVDLNR);
 274         iowrite16(vtln - 1, par->base + LDVTLNR);
 275         /* h/v sync signals */
 276         iowrite16((vsynp - 1) | ((vsynw - 1) << 12), par->base + LDVSYNR);
 277         iowrite16(((hsynp >> 3) - 1) | (((hsynw >> 3) - 1) << 12),
 278                   par->base + LDHSYNR);
 279         /* AC modulation sig */
 280         iowrite16(par->pd->ldaclnr, par->base + LDACLNR);
 281
 282         stride = (par->rot) ? vtln : hdcn;
 283         if (!gray)
 284                 stride *= (bpp + 7) >> 3;
 285         else {
 286                 if (bpp == 1)
 287                         stride >>= 3;
 288                 else if (bpp == 2)
 289                         stride >>= 2;
 290                 else if (bpp == 4)
 291                         stride >>= 1;
 292                 /* 6 bpp == 8 bpp */
 293         }
 294
 295         /* if rotated, stride must be power of 2 */
 296         if (par->rot) {
 297                 unsigned long bit = 1 << 31;
 298                 while (bit) {
 299                         if (stride & bit)
 300                                 break;
 301                         bit >>= 1;
 302                 }
 303                 if (stride & ~bit)
 304                         stride = bit << 1;      /* not P-o-2, round up */
 305         }
 306         iowrite16(stride, par->base + LDLAOR);
 307
 308         /* set display mem start address */
 309         sbase = (unsigned long)par->fbdma;
 310         if (par->rot)
 311                 sbase += (hdcn - 1) * stride;
 312
 313         iowrite32(sbase, par->base + LDSARU);
 314
 315         /*
 316          * for DSTN need to set address for lower half.
 317          * I (mlau) don't know which address to set it to,
 318          * so I guessed at (stride * yres/2).
 319          */
 320         if (((ldmtr & 0x003f) >= LDMTR_DSTN_MONO_8) &&
 321             ((ldmtr & 0x003f) <= LDMTR_DSTN_COLOR_16)) {
 322
 323                 dev_dbg(info->dev, " ***** DSTN untested! *****\n");
 324
 325                 dstn_off = stride;
 326                 if (par->rot)
 327                         dstn_off *= hdcn >> 1;
 328                 else
 329                         dstn_off *= vdln >> 1;
 330
 331                 ldsarl = sbase + dstn_off;
 332         } else
 333                 ldsarl = 0;
 334
 335         iowrite32(ldsarl, par->base + LDSARL);  /* mem for lower half of DSTN */
 336
 337         encode_fix(&info->fix, info, stride);
 338         sh7760fb_check_var(&info->var, info);
 339
 340         sh7760fb_blank(FB_BLANK_UNBLANK, info); /* panel on! */
 341
 342         dev_dbg(info->dev, "hdcn  : %6d htcn  : %6d\n", hdcn, htcn);
 343         dev_dbg(info->dev, "hsynw : %6d hsynp : %6d\n", hsynw, hsynp);
 344         dev_dbg(info->dev, "vdln  : %6d vtln  : %6d\n", vdln, vtln);
 345         dev_dbg(info->dev, "vsynw : %6d vsynp : %6d\n", vsynw, vsynp);
 346         dev_dbg(info->dev, "clksrc: %6d clkdiv: %6d\n",
 347                 (par->pd->ldickr >> 12) & 3, par->pd->ldickr & 0x1f);
 348         dev_dbg(info->dev, "ldpmmr: 0x%04x ldpspr: 0x%04x\n", par->pd->ldpmmr,
 349                 par->pd->ldpspr);
 350         dev_dbg(info->dev, "ldmtr : 0x%04x lddfr : 0x%04x\n", ldmtr, lddfr);
 351         dev_dbg(info->dev, "ldlaor: %ld\n", stride);
 352         dev_dbg(info->dev, "ldsaru: 0x%08lx ldsarl: 0x%08lx\n", sbase, ldsarl);
 353
 354         return 0;
 355 }
 356
 357 static struct fb_ops sh7760fb_ops = {
 358         .owner = THIS_MODULE,
 359         .fb_blank = sh7760fb_blank,
 360         .fb_check_var = sh7760fb_check_var,
 361         .fb_setcolreg = sh7760_setcolreg,
 362         .fb_set_par = sh7760fb_set_par,
 363         .fb_fillrect = cfb_fillrect,
 364         .fb_copyarea = cfb_copyarea,
 365         .fb_imageblit = cfb_imageblit,
 366 };
 367
 368 static void sh7760fb_free_mem(struct fb_info *info)
 369 {
 370         struct sh7760fb_par *par = info->par;
 371
 372         if (!info->screen_base)
 373                 return;
 374
 375         dma_free_coherent(info->dev, info->screen_size,
 376                           info->screen_base, par->fbdma);
 377
 378         par->fbdma = 0;
 379         info->screen_base = NULL;
 380         info->screen_size = 0;
 381 }
 382
 383 /* allocate the framebuffer memory. This memory must be in Area3,
 384  * (dictated by the DMA engine) and contiguous, at a 512 byte boundary.
 385  */
 386 static int sh7760fb_alloc_mem(struct fb_info *info)
 387 {
 388         struct sh7760fb_par *par = info->par;
 389         void *fbmem;
 390         unsigned long vram;
 391         int ret, bpp;
 392
 393         if (info->screen_base)
 394                 return 0;
 395
 396         /* get color info from register value */
 397         ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
 398         if (ret) {
 399                 printk(KERN_ERR "colinfo\n");
 400                 return ret;
 401         }
 402
 403         /* min VRAM: xres_min = 16, yres_min = 1, bpp = 1: 2byte -> 1 page
 404            max VRAM: xres_max = 1024, yres_max = 1024, bpp = 16: 2MB */
 405
 406         vram = info->var.xres * info->var.yres;
 407         if (info->var.grayscale) {
 408                 if (bpp == 1)
 409                         vram >>= 3;
 410                 else if (bpp == 2)
 411                         vram >>= 2;
 412                 else if (bpp == 4)
 413                         vram >>= 1;
 414         } else if (bpp > 8)
 415                 vram *= 2;
 416         if ((vram < 1) || (vram > 1024 * 2048)) {
 417                 dev_dbg(info->dev, "too much VRAM required. Check settings\n");
 418                 return -ENODEV;
 419         }
 420
 421         if (vram < PAGE_SIZE)
 422                 vram = PAGE_SIZE;
 423
 424         fbmem = dma_alloc_coherent(info->dev, vram, &par->fbdma, GFP_KERNEL);
 425
 426         if (!fbmem)
 427                 return -ENOMEM;
 428
 429         if ((par->fbdma & SH7760FB_DMA_MASK) != SH7760FB_DMA_MASK) {
 430                 sh7760fb_free_mem(info);
 431                 dev_err(info->dev, "kernel gave me memory at 0x%08lx, which is"
 432                         "unusable for the LCDC\n", (unsigned long)par->fbdma);
 433                 return -ENOMEM;
 434         }
 435
 436         info->screen_base = fbmem;
 437         info->screen_size = vram;
 438
 439         return 0;
 440 }
 441
 442 static int __devinit sh7760fb_probe(struct platform_device *pdev)
 443 {
 444         struct fb_info *info;
 445         struct resource *res;
 446         struct sh7760fb_par *par;
 447         int ret;
 448
 449         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 450         if (unlikely(res == NULL)) {
 451                 dev_err(&pdev->dev, "invalid resource\n");
 452                 return -EINVAL;
 453         }
 454
 455         info = framebuffer_alloc(sizeof(struct sh7760fb_par), &pdev->dev);
 456         if (!info)
 457                 return -ENOMEM;
 458
 459         par = info->par;
 460         par->dev = pdev;
 461
 462         par->pd = pdev->dev.platform_data;
 463         if (!par->pd) {
 464                 dev_dbg(info->dev, "no display setup data!\n");
 465                 ret = -ENODEV;
 466                 goto out_fb;
 467         }
 468
 469         par->ioarea = request_mem_region(res->start,
 470                                          (res->end - res->start), pdev->name);
 471         if (!par->ioarea) {
 472                 dev_err(&pdev->dev, "mmio area busy\n");
 473                 ret = -EBUSY;
 474                 goto out_fb;
 475         }
 476
 477         par->base = ioremap_nocache(res->start, res->end - res->start + 1);
 478         if (!par->base) {
 479                 dev_err(&pdev->dev, "cannot remap\n");
 480                 ret = -ENODEV;
 481                 goto out_res;
 482         }
 483
 484         iowrite16(0, par->base + LDINTR);       /* disable vsync irq */
 485         par->irq = platform_get_irq(pdev, 0);
 486         if (par->irq >= 0) {
 487                 ret = request_irq(par->irq, sh7760fb_irq, 0,
 488                                   "sh7760-lcdc", &par->vsync);
 489                 if (ret) {
 490                         dev_err(&pdev->dev, "cannot grab IRQ\n");
 491                         par->irq = -ENXIO;
 492                 } else
 493                         disable_irq_nosync(par->irq);
 494         }
 495
 496         fb_videomode_to_var(&info->var, par->pd->def_mode);
 497
 498         ret = sh7760fb_alloc_mem(info);
 499         if (ret) {
 500                 dev_dbg(info->dev, "framebuffer memory allocation failed!\n");
 501                 goto out_unmap;
 502         }
 503
 504         info->pseudo_palette = par->pseudo_palette;
 505
 506         /* fixup color register bitpositions. These are fixed by hardware */
 507         info->var.red.offset = 11;
 508         info->var.red.length = 5;
 509         info->var.red.msb_right = 0;
 510
 511         info->var.green.offset = 5;
 512         info->var.green.length = 6;
 513         info->var.green.msb_right = 0;
 514
 515         info->var.blue.offset = 0;
 516         info->var.blue.length = 5;
 517         info->var.blue.msb_right = 0;
 518
 519         info->var.transp.offset = 0;
 520         info->var.transp.length = 0;
 521         info->var.transp.msb_right = 0;
 522
 523         /* set the DON2 bit now, before cmap allocation, as it will randomize
 524          * palette memory.
 525          */
 526         iowrite16(LDCNTR_DON2, par->base + LDCNTR);
 527         info->fbops = &sh7760fb_ops;
 528
 529         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 530         if (ret) {
 531                 dev_dbg(info->dev, "Unable to allocate cmap memory\n");
 532                 goto out_mem;
 533         }
 534
 535         ret = register_framebuffer(info);
 536         if (ret < 0) {
 537                 dev_dbg(info->dev, "cannot register fb!\n");
 538                 goto out_cmap;
 539         }
 540         platform_set_drvdata(pdev, info);
 541
 542         printk(KERN_INFO "%s: memory at phys 0x%08lx-0x%08lx, size %ld KiB\n",
 543                pdev->name,
 544                (unsigned long)par->fbdma,
 545                (unsigned long)(par->fbdma + info->screen_size - 1),
 546                info->screen_size >> 10);
 547
 548         return 0;
 549
 550 out_cmap:
 551         sh7760fb_blank(FB_BLANK_POWERDOWN, info);
 552         fb_dealloc_cmap(&info->cmap);
 553 out_mem:
 554         sh7760fb_free_mem(info);
 555 out_unmap:
 556         if (par->irq >= 0)
 557                 free_irq(par->irq, &par->vsync);
 558         iounmap(par->base);
 559 out_res:
 560         release_resource(par->ioarea);
 561         kfree(par->ioarea);
 562 out_fb:
 563         framebuffer_release(info);
 564         return ret;
 565 }
 566
 567 static int __devexit sh7760fb_remove(struct platform_device *dev)
 568 {
 569         struct fb_info *info = platform_get_drvdata(dev);
 570         struct sh7760fb_par *par = info->par;
 571
 572         sh7760fb_blank(FB_BLANK_POWERDOWN, info);
 573         unregister_framebuffer(info);
 574         fb_dealloc_cmap(&info->cmap);
 575         sh7760fb_free_mem(info);
 576         if (par->irq >= 0)
 577                 free_irq(par->irq, par);
 578         iounmap(par->base);
 579         release_resource(par->ioarea);
 580         kfree(par->ioarea);
 581         framebuffer_release(info);
 582         platform_set_drvdata(dev, NULL);
 583
 584         return 0;
 585 }
 586
 587 static struct platform_driver sh7760_lcdc_driver = {
 588         .driver = {
 589                    .name = "sh7760-lcdc",
 590                    .owner = THIS_MODULE,
 591                    },
 592         .probe = sh7760fb_probe,
 593         .remove = __devexit_p(sh7760fb_remove),
 594 };
 595
 596 static int __init sh7760fb_init(void)
 597 {
 598         return platform_driver_register(&sh7760_lcdc_driver);
 599 }
 600
 601 static void __exit sh7760fb_exit(void)
 602 {
 603         platform_driver_unregister(&sh7760_lcdc_driver);
 604 }
 605
 606 module_init(sh7760fb_init);
 607 module_exit(sh7760fb_exit);
 608
 609 MODULE_AUTHOR("Nobuhiro Iwamatsu, Manuel Lauss");
 610 MODULE_DESCRIPTION("FBdev for SH7760/63 integrated LCD Controller");
 611 MODULE_LICENSE("GPL");