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