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->vsync); 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 }, 582 .probe = sh7760fb_probe, 583 .remove = sh7760fb_remove, 584 }; 585 586 module_platform_driver(sh7760_lcdc_driver); 587 588 MODULE_AUTHOR("Nobuhiro Iwamatsu, Manuel Lauss"); 589 MODULE_DESCRIPTION("FBdev for SH7760/63 integrated LCD Controller"); 590 MODULE_LICENSE("GPL"); 591