drivers/video/fbdev/sh7760fb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * SH7760/SH7763 LCDC Framebuffer driver.
   4  *
   5  * (c) 2006-2008 MSC Vertriebsges.m.b.H.,
   6  *             Manuel Lauss <mano@roarinelk.homelinux.net>
   7  * (c) 2008 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
   8  *
   9  * PLEASE HAVE A LOOK AT Documentation/fb/sh7760fb.rst!
  10  *
  11  * Thanks to Siegfried Schaefer <s.schaefer at schaefer-edv.de>
  12  *     for his original source and testing!
  13  *
  14  * sh7760_setcolreg get from drivers/video/sh_mobile_lcdcfb.c
  15  */
  16
  17 #include <linux/completion.h>
  18 #include <linux/delay.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/fb.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/io.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/slab.h>
  27
  28 #include <asm/sh7760fb.h>
  29
  30 struct sh7760fb_par {
  31         void __iomem *base;
  32         int irq;
  33
  34         struct sh7760fb_platdata *pd;   /* display information */
  35
  36         dma_addr_t fbdma;       /* physical address */
  37
  38         int rot;                /* rotation enabled? */
  39
  40         u32 pseudo_palette[16];
  41
  42         struct platform_device *dev;
  43         struct resource *ioarea;
  44         struct completion vsync;        /* vsync irq event */
  45 };
  46
  47 static irqreturn_t sh7760fb_irq(int irq, void *data)
  48 {
  49         struct completion *c = data;
  50
  51         complete(c);
  52
  53         return IRQ_HANDLED;
  54 }
  55
  56 /* wait_for_lps - wait until power supply has reached a certain state. */
  57 static int wait_for_lps(struct sh7760fb_par *par, int val)
  58 {
  59         int i = 100;
  60         while (--i && ((ioread16(par->base + LDPMMR) & 3) != val))
  61                 msleep(1);
  62
  63         if (i <= 0)
  64                 return -ETIMEDOUT;
  65
  66         return 0;
  67 }
  68
  69 /* en/disable the LCDC */
  70 static int sh7760fb_blank(int blank, struct fb_info *info)
  71 {
  72         struct sh7760fb_par *par = info->par;
  73         struct sh7760fb_platdata *pd = par->pd;
  74         unsigned short cntr = ioread16(par->base + LDCNTR);
  75         unsigned short intr = ioread16(par->base + LDINTR);
  76         int lps;
  77
  78         if (blank == FB_BLANK_UNBLANK) {
  79                 intr |= VINT_START;
  80                 cntr = LDCNTR_DON2 | LDCNTR_DON;
  81                 lps = 3;
  82         } else {
  83                 intr &= ~VINT_START;
  84                 cntr = LDCNTR_DON2;
  85                 lps = 0;
  86         }
  87
  88         if (pd->blank)
  89                 pd->blank(blank);
  90
  91         iowrite16(intr, par->base + LDINTR);
  92         iowrite16(cntr, par->base + LDCNTR);
  93
  94         return wait_for_lps(par, lps);
  95 }
  96
  97 static int sh7760_setcolreg (u_int regno,
  98         u_int red, u_int green, u_int blue,
  99         u_int transp, struct fb_info *info)
 100 {
 101         u32 *palette = info->pseudo_palette;
 102
 103         if (regno >= 16)
 104                 return -EINVAL;
 105
 106         /* only FB_VISUAL_TRUECOLOR supported */
 107
 108         red >>= 16 - info->var.red.length;
 109         green >>= 16 - info->var.green.length;
 110         blue >>= 16 - info->var.blue.length;
 111         transp >>= 16 - info->var.transp.length;
 112
 113         palette[regno] = (red << info->var.red.offset) |
 114                 (green << info->var.green.offset) |
 115                 (blue << info->var.blue.offset) |
 116                 (transp << info->var.transp.offset);
 117
 118         return 0;
 119 }
 120
 121 static int sh7760fb_get_color_info(struct device *dev,
 122                                    u16 lddfr, int *bpp, int *gray)
 123 {
 124         int lbpp, lgray;
 125
 126         lgray = lbpp = 0;
 127
 128         switch (lddfr & LDDFR_COLOR_MASK) {
 129         case LDDFR_1BPP_MONO:
 130                 lgray = 1;
 131                 lbpp = 1;
 132                 break;
 133         case LDDFR_2BPP_MONO:
 134                 lgray = 1;
 135                 lbpp = 2;
 136                 break;
 137         case LDDFR_4BPP_MONO:
 138                 lgray = 1;
 139         case LDDFR_4BPP:
 140                 lbpp = 4;
 141                 break;
 142         case LDDFR_6BPP_MONO:
 143                 lgray = 1;
 144         case LDDFR_8BPP:
 145                 lbpp = 8;
 146                 break;
 147         case LDDFR_16BPP_RGB555:
 148         case LDDFR_16BPP_RGB565:
 149                 lbpp = 16;
 150                 lgray = 0;
 151                 break;
 152         default:
 153                 dev_dbg(dev, "unsupported LDDFR bit depth.\n");
 154                 return -EINVAL;
 155         }
 156
 157         if (bpp)
 158                 *bpp = lbpp;
 159         if (gray)
 160                 *gray = lgray;
 161
 162         return 0;
 163 }
 164
 165 static int sh7760fb_check_var(struct fb_var_screeninfo *var,
 166                               struct fb_info *info)
 167 {
 168         struct fb_fix_screeninfo *fix = &info->fix;
 169         struct sh7760fb_par *par = info->par;
 170         int ret, bpp;
 171
 172         /* get color info from register value */
 173         ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
 174         if (ret)
 175                 return ret;
 176
 177         var->bits_per_pixel = bpp;
 178
 179         if ((var->grayscale) && (var->bits_per_pixel == 1))
 180                 fix->visual = FB_VISUAL_MONO10;
 181         else if (var->bits_per_pixel >= 15)
 182                 fix->visual = FB_VISUAL_TRUECOLOR;
 183         else
 184                 fix->visual = FB_VISUAL_PSEUDOCOLOR;
 185
 186         /* TODO: add some more validation here */
 187         return 0;
 188 }
 189
 190 /*
 191  * sh7760fb_set_par - set videomode.
 192  *
 193  * NOTE: The rotation, grayscale and DSTN codepaths are
 194  *     totally untested!
 195  */
 196 static int sh7760fb_set_par(struct fb_info *info)
 197 {
 198         struct sh7760fb_par *par = info->par;
 199         struct fb_videomode *vm = par->pd->def_mode;
 200         unsigned long sbase, dstn_off, ldsarl, stride;
 201         unsigned short hsynp, hsynw, htcn, hdcn;
 202         unsigned short vsynp, vsynw, vtln, vdln;
 203         unsigned short lddfr, ldmtr;
 204         int ret, bpp, gray;
 205
 206         par->rot = par->pd->rotate;
 207
 208         /* rotate only works with xres <= 320 */
 209         if (par->rot && (vm->xres > 320)) {
 210                 dev_dbg(info->dev, "rotation disabled due to display size\n");
 211                 par->rot = 0;
 212         }
 213
 214         /* calculate LCDC reg vals from display parameters */
 215         hsynp = vm->right_margin + vm->xres;
 216         hsynw = vm->hsync_len;
 217         htcn = vm->left_margin + hsynp + hsynw;
 218         hdcn = vm->xres;
 219         vsynp = vm->lower_margin + vm->yres;
 220         vsynw = vm->vsync_len;
 221         vtln = vm->upper_margin + vsynp + vsynw;
 222         vdln = vm->yres;
 223
 224         /* get color info from register value */
 225         ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, &gray);
 226         if (ret)
 227                 return ret;
 228
 229         dev_dbg(info->dev, "%dx%d %dbpp %s (orientation %s)\n", hdcn,
 230                 vdln, bpp, gray ? "grayscale" : "color",
 231                 par->rot ? "rotated" : "normal");
 232
 233 #ifdef CONFIG_CPU_LITTLE_ENDIAN
 234         lddfr = par->pd->lddfr | (1 << 8);
 235 #else
 236         lddfr = par->pd->lddfr & ~(1 << 8);
 237 #endif
 238
 239         ldmtr = par->pd->ldmtr;
 240
 241         if (!(vm->sync & FB_SYNC_HOR_HIGH_ACT))
 242                 ldmtr |= LDMTR_CL1POL;
 243         if (!(vm->sync & FB_SYNC_VERT_HIGH_ACT))
 244                 ldmtr |= LDMTR_FLMPOL;
 245
 246         /* shut down LCDC before changing display parameters */
 247         sh7760fb_blank(FB_BLANK_POWERDOWN, info);
 248
 249         iowrite16(par->pd->ldickr, par->base + LDICKR); /* pixclock */
 250         iowrite16(ldmtr, par->base + LDMTR);    /* polarities */
 251         iowrite16(lddfr, par->base + LDDFR);    /* color/depth */
 252         iowrite16((par->rot ? 1 << 13 : 0), par->base + LDSMR); /* rotate */
 253         iowrite16(par->pd->ldpmmr, par->base + LDPMMR); /* Power Management */
 254         iowrite16(par->pd->ldpspr, par->base + LDPSPR); /* Power Supply Ctrl */
 255
 256         /* display resolution */
 257         iowrite16(((htcn >> 3) - 1) | (((hdcn >> 3) - 1) << 8),
 258                   par->base + LDHCNR);
 259         iowrite16(vdln - 1, par->base + LDVDLNR);
 260         iowrite16(vtln - 1, par->base + LDVTLNR);
 261         /* h/v sync signals */
 262         iowrite16((vsynp - 1) | ((vsynw - 1) << 12), par->base + LDVSYNR);
 263         iowrite16(((hsynp >> 3) - 1) | (((hsynw >> 3) - 1) << 12),
 264                   par->base + LDHSYNR);
 265         /* AC modulation sig */
 266         iowrite16(par->pd->ldaclnr, par->base + LDACLNR);
 267
 268         stride = (par->rot) ? vtln : hdcn;
 269         if (!gray)
 270                 stride *= (bpp + 7) >> 3;
 271         else {
 272                 if (bpp == 1)
 273                         stride >>= 3;
 274                 else if (bpp == 2)
 275                         stride >>= 2;
 276                 else if (bpp == 4)
 277                         stride >>= 1;
 278                 /* 6 bpp == 8 bpp */
 279         }
 280
 281         /* if rotated, stride must be power of 2 */
 282         if (par->rot) {
 283                 unsigned long bit = 1 << 31;
 284                 while (bit) {
 285                         if (stride & bit)
 286                                 break;
 287                         bit >>= 1;
 288                 }
 289                 if (stride & ~bit)
 290                         stride = bit << 1;      /* not P-o-2, round up */
 291         }
 292         iowrite16(stride, par->base + LDLAOR);
 293
 294         /* set display mem start address */
 295         sbase = (unsigned long)par->fbdma;
 296         if (par->rot)
 297                 sbase += (hdcn - 1) * stride;
 298
 299         iowrite32(sbase, par->base + LDSARU);
 300
 301         /*
 302          * for DSTN need to set address for lower half.
 303          * I (mlau) don't know which address to set it to,
 304          * so I guessed at (stride * yres/2).
 305          */
 306         if (((ldmtr & 0x003f) >= LDMTR_DSTN_MONO_8) &&
 307             ((ldmtr & 0x003f) <= LDMTR_DSTN_COLOR_16)) {
 308
 309                 dev_dbg(info->dev, " ***** DSTN untested! *****\n");
 310
 311                 dstn_off = stride;
 312                 if (par->rot)
 313                         dstn_off *= hdcn >> 1;
 314                 else
 315                         dstn_off *= vdln >> 1;
 316
 317                 ldsarl = sbase + dstn_off;
 318         } else
 319                 ldsarl = 0;
 320
 321         iowrite32(ldsarl, par->base + LDSARL);  /* mem for lower half of DSTN */
 322
 323         info->fix.line_length = stride;
 324
 325         sh7760fb_check_var(&info->var, info);
 326
 327         sh7760fb_blank(FB_BLANK_UNBLANK, info); /* panel on! */
 328
 329         dev_dbg(info->dev, "hdcn  : %6d htcn  : %6d\n", hdcn, htcn);
 330         dev_dbg(info->dev, "hsynw : %6d hsynp : %6d\n", hsynw, hsynp);
 331         dev_dbg(info->dev, "vdln  : %6d vtln  : %6d\n", vdln, vtln);
 332         dev_dbg(info->dev, "vsynw : %6d vsynp : %6d\n", vsynw, vsynp);
 333         dev_dbg(info->dev, "clksrc: %6d clkdiv: %6d\n",
 334                 (par->pd->ldickr >> 12) & 3, par->pd->ldickr & 0x1f);
 335         dev_dbg(info->dev, "ldpmmr: 0x%04x ldpspr: 0x%04x\n", par->pd->ldpmmr,
 336                 par->pd->ldpspr);
 337         dev_dbg(info->dev, "ldmtr : 0x%04x lddfr : 0x%04x\n", ldmtr, lddfr);
 338         dev_dbg(info->dev, "ldlaor: %ld\n", stride);
 339         dev_dbg(info->dev, "ldsaru: 0x%08lx ldsarl: 0x%08lx\n", sbase, ldsarl);
 340
 341         return 0;
 342 }
 343
 344 static const struct fb_ops sh7760fb_ops = {
 345         .owner = THIS_MODULE,
 346         .fb_blank = sh7760fb_blank,
 347         .fb_check_var = sh7760fb_check_var,
 348         .fb_setcolreg = sh7760_setcolreg,
 349         .fb_set_par = sh7760fb_set_par,
 350         .fb_fillrect = cfb_fillrect,
 351         .fb_copyarea = cfb_copyarea,
 352         .fb_imageblit = cfb_imageblit,
 353 };
 354
 355 static void sh7760fb_free_mem(struct fb_info *info)
 356 {
 357         struct sh7760fb_par *par = info->par;
 358
 359         if (!info->screen_base)
 360                 return;
 361
 362         dma_free_coherent(info->dev, info->screen_size,
 363                           info->screen_base, par->fbdma);
 364
 365         par->fbdma = 0;
 366         info->screen_base = NULL;
 367         info->screen_size = 0;
 368 }
 369
 370 /* allocate the framebuffer memory. This memory must be in Area3,
 371  * (dictated by the DMA engine) and contiguous, at a 512 byte boundary.
 372  */
 373 static int sh7760fb_alloc_mem(struct fb_info *info)
 374 {
 375         struct sh7760fb_par *par = info->par;
 376         void *fbmem;
 377         unsigned long vram;
 378         int ret, bpp;
 379
 380         if (info->screen_base)
 381                 return 0;
 382
 383         /* get color info from register value */
 384         ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
 385         if (ret) {
 386                 printk(KERN_ERR "colinfo\n");
 387                 return ret;
 388         }
 389
 390         /* min VRAM: xres_min = 16, yres_min = 1, bpp = 1: 2byte -> 1 page
 391            max VRAM: xres_max = 1024, yres_max = 1024, bpp = 16: 2MB */
 392
 393         vram = info->var.xres * info->var.yres;
 394         if (info->var.grayscale) {
 395                 if (bpp == 1)
 396                         vram >>= 3;
 397                 else if (bpp == 2)
 398                         vram >>= 2;
 399                 else if (bpp == 4)
 400                         vram >>= 1;
 401         } else if (bpp > 8)
 402                 vram *= 2;
 403         if ((vram < 1) || (vram > 1024 * 2048)) {
 404                 dev_dbg(info->dev, "too much VRAM required. Check settings\n");
 405                 return -ENODEV;
 406         }
 407
 408         if (vram < PAGE_SIZE)
 409                 vram = PAGE_SIZE;
 410
 411         fbmem = dma_alloc_coherent(info->dev, vram, &par->fbdma, GFP_KERNEL);
 412
 413         if (!fbmem)
 414                 return -ENOMEM;
 415
 416         if ((par->fbdma & SH7760FB_DMA_MASK) != SH7760FB_DMA_MASK) {
 417                 sh7760fb_free_mem(info);
 418                 dev_err(info->dev, "kernel gave me memory at 0x%08lx, which is"
 419                         "unusable for the LCDC\n", (unsigned long)par->fbdma);
 420                 return -ENOMEM;
 421         }
 422
 423         info->screen_base = fbmem;
 424         info->screen_size = vram;
 425         info->fix.smem_start = (unsigned long)info->screen_base;
 426         info->fix.smem_len = info->screen_size;
 427
 428         return 0;
 429 }
 430
 431 static int sh7760fb_probe(struct platform_device *pdev)
 432 {
 433         struct fb_info *info;
 434         struct resource *res;
 435         struct sh7760fb_par *par;
 436         int ret;
 437
 438         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 439         if (unlikely(res == NULL)) {
 440                 dev_err(&pdev->dev, "invalid resource\n");
 441                 return -EINVAL;
 442         }
 443
 444         info = framebuffer_alloc(sizeof(struct sh7760fb_par), &pdev->dev);
 445         if (!info)
 446                 return -ENOMEM;
 447
 448         par = info->par;
 449         par->dev = pdev;
 450
 451         par->pd = pdev->dev.platform_data;
 452         if (!par->pd) {
 453                 dev_dbg(info->dev, "no display setup data!\n");
 454                 ret = -ENODEV;
 455                 goto out_fb;
 456         }
 457
 458         par->ioarea = request_mem_region(res->start,
 459                                          resource_size(res), pdev->name);
 460         if (!par->ioarea) {
 461                 dev_err(&pdev->dev, "mmio area busy\n");
 462                 ret = -EBUSY;
 463                 goto out_fb;
 464         }
 465
 466         par->base = ioremap(res->start, resource_size(res));
 467         if (!par->base) {
 468                 dev_err(&pdev->dev, "cannot remap\n");
 469                 ret = -ENODEV;
 470                 goto out_res;
 471         }
 472
 473         iowrite16(0, par->base + LDINTR);       /* disable vsync irq */
 474         par->irq = platform_get_irq(pdev, 0);
 475         if (par->irq >= 0) {
 476                 ret = request_irq(par->irq, sh7760fb_irq, 0,
 477                                   "sh7760-lcdc", &par->vsync);
 478                 if (ret) {
 479                         dev_err(&pdev->dev, "cannot grab IRQ\n");
 480                         par->irq = -ENXIO;
 481                 } else
 482                         disable_irq_nosync(par->irq);
 483         }
 484
 485         fb_videomode_to_var(&info->var, par->pd->def_mode);
 486
 487         ret = sh7760fb_alloc_mem(info);
 488         if (ret) {
 489                 dev_dbg(info->dev, "framebuffer memory allocation failed!\n");
 490                 goto out_unmap;
 491         }
 492
 493         info->pseudo_palette = par->pseudo_palette;
 494
 495         /* fixup color register bitpositions. These are fixed by hardware */
 496         info->var.red.offset = 11;
 497         info->var.red.length = 5;
 498         info->var.red.msb_right = 0;
 499
 500         info->var.green.offset = 5;
 501         info->var.green.length = 6;
 502         info->var.green.msb_right = 0;
 503
 504         info->var.blue.offset = 0;
 505         info->var.blue.length = 5;
 506         info->var.blue.msb_right = 0;
 507
 508         info->var.transp.offset = 0;
 509         info->var.transp.length = 0;
 510         info->var.transp.msb_right = 0;
 511
 512         strcpy(info->fix.id, "sh7760-lcdc");
 513
 514         /* set the DON2 bit now, before cmap allocation, as it will randomize
 515          * palette memory.
 516          */
 517         iowrite16(LDCNTR_DON2, par->base + LDCNTR);
 518         info->fbops = &sh7760fb_ops;
 519
 520         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 521         if (ret) {
 522                 dev_dbg(info->dev, "Unable to allocate cmap memory\n");
 523                 goto out_mem;
 524         }
 525
 526         ret = register_framebuffer(info);
 527         if (ret < 0) {
 528                 dev_dbg(info->dev, "cannot register fb!\n");
 529                 goto out_cmap;
 530         }
 531         platform_set_drvdata(pdev, info);
 532
 533         printk(KERN_INFO "%s: memory at phys 0x%08lx-0x%08lx, size %ld KiB\n",
 534                pdev->name,
 535                (unsigned long)par->fbdma,
 536                (unsigned long)(par->fbdma + info->screen_size - 1),
 537                info->screen_size >> 10);
 538
 539         return 0;
 540
 541 out_cmap:
 542         sh7760fb_blank(FB_BLANK_POWERDOWN, info);
 543         fb_dealloc_cmap(&info->cmap);
 544 out_mem:
 545         sh7760fb_free_mem(info);
 546 out_unmap:
 547         if (par->irq >= 0)
 548                 free_irq(par->irq, &par->vsync);
 549         iounmap(par->base);
 550 out_res:
 551         release_mem_region(res->start, resource_size(res));
 552 out_fb:
 553         framebuffer_release(info);
 554         return ret;
 555 }
 556
 557 static int sh7760fb_remove(struct platform_device *dev)
 558 {
 559         struct fb_info *info = platform_get_drvdata(dev);
 560         struct sh7760fb_par *par = info->par;
 561
 562         sh7760fb_blank(FB_BLANK_POWERDOWN, info);
 563         unregister_framebuffer(info);
 564         fb_dealloc_cmap(&info->cmap);
 565         sh7760fb_free_mem(info);
 566         if (par->irq >= 0)
 567                 free_irq(par->irq, &par->vsync);
 568         iounmap(par->base);
 569         release_mem_region(par->ioarea->start, resource_size(par->ioarea));
 570         framebuffer_release(info);
 571
 572         return 0;
 573 }
 574
 575 static struct platform_driver sh7760_lcdc_driver = {
 576         .driver = {
 577                    .name = "sh7760-lcdc",
 578                    },
 579         .probe = sh7760fb_probe,
 580         .remove = sh7760fb_remove,
 581 };
 582
 583 module_platform_driver(sh7760_lcdc_driver);
 584
 585 MODULE_AUTHOR("Nobuhiro Iwamatsu, Manuel Lauss");
 586 MODULE_DESCRIPTION("FBdev for SH7760/63 integrated LCD Controller");
 587 MODULE_LICENSE("GPL v2");