1 /* 2 * linux/drivers/video/amba-clcd.c 3 * 4 * Copyright (C) 2001 ARM Limited, by David A Rusling 5 * Updated to 2.5, Deep Blue Solutions Ltd. 6 * 7 * This file is subject to the terms and conditions of the GNU General Public 8 * License. See the file COPYING in the main directory of this archive 9 * for more details. 10 * 11 * ARM PrimeCell PL110 Color LCD Controller 12 */ 13 #include <linux/amba/bus.h> 14 #include <linux/amba/clcd.h> 15 #include <linux/backlight.h> 16 #include <linux/clk.h> 17 #include <linux/delay.h> 18 #include <linux/dma-mapping.h> 19 #include <linux/fb.h> 20 #include <linux/init.h> 21 #include <linux/ioport.h> 22 #include <linux/list.h> 23 #include <linux/mm.h> 24 #include <linux/module.h> 25 #include <linux/of_address.h> 26 #include <linux/of_graph.h> 27 #include <linux/slab.h> 28 #include <linux/string.h> 29 #include <video/display_timing.h> 30 #include <video/of_display_timing.h> 31 #include <video/videomode.h> 32 33 #define to_clcd(info) container_of(info, struct clcd_fb, fb) 34 35 /* This is limited to 16 characters when displayed by X startup */ 36 static const char *clcd_name = "CLCD FB"; 37 38 static inline void clcdfb_set_start(struct clcd_fb *fb) 39 { 40 unsigned long ustart = fb->fb.fix.smem_start; 41 unsigned long lstart; 42 43 ustart += fb->fb.var.yoffset * fb->fb.fix.line_length; 44 lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2; 45 46 writel(ustart, fb->regs + CLCD_UBAS); 47 writel(lstart, fb->regs + CLCD_LBAS); 48 } 49 50 static void clcdfb_disable(struct clcd_fb *fb) 51 { 52 u32 val; 53 54 if (fb->board->disable) 55 fb->board->disable(fb); 56 57 if (fb->panel->backlight) { 58 fb->panel->backlight->props.power = FB_BLANK_POWERDOWN; 59 backlight_update_status(fb->panel->backlight); 60 } 61 62 val = readl(fb->regs + fb->off_cntl); 63 if (val & CNTL_LCDPWR) { 64 val &= ~CNTL_LCDPWR; 65 writel(val, fb->regs + fb->off_cntl); 66 67 msleep(20); 68 } 69 if (val & CNTL_LCDEN) { 70 val &= ~CNTL_LCDEN; 71 writel(val, fb->regs + fb->off_cntl); 72 } 73 74 /* 75 * Disable CLCD clock source. 76 */ 77 if (fb->clk_enabled) { 78 fb->clk_enabled = false; 79 clk_disable(fb->clk); 80 } 81 } 82 83 static void clcdfb_enable(struct clcd_fb *fb, u32 cntl) 84 { 85 /* 86 * Enable the CLCD clock source. 87 */ 88 if (!fb->clk_enabled) { 89 fb->clk_enabled = true; 90 clk_enable(fb->clk); 91 } 92 93 /* 94 * Bring up by first enabling.. 95 */ 96 cntl |= CNTL_LCDEN; 97 writel(cntl, fb->regs + fb->off_cntl); 98 99 msleep(20); 100 101 /* 102 * and now apply power. 103 */ 104 cntl |= CNTL_LCDPWR; 105 writel(cntl, fb->regs + fb->off_cntl); 106 107 /* 108 * Turn on backlight 109 */ 110 if (fb->panel->backlight) { 111 fb->panel->backlight->props.power = FB_BLANK_UNBLANK; 112 backlight_update_status(fb->panel->backlight); 113 } 114 115 /* 116 * finally, enable the interface. 117 */ 118 if (fb->board->enable) 119 fb->board->enable(fb); 120 } 121 122 static int 123 clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var) 124 { 125 u32 caps; 126 int ret = 0; 127 128 if (fb->panel->caps && fb->board->caps) 129 caps = fb->panel->caps & fb->board->caps; 130 else { 131 /* Old way of specifying what can be used */ 132 caps = fb->panel->cntl & CNTL_BGR ? 133 CLCD_CAP_BGR : CLCD_CAP_RGB; 134 /* But mask out 444 modes as they weren't supported */ 135 caps &= ~CLCD_CAP_444; 136 } 137 138 /* Only TFT panels can do RGB888/BGR888 */ 139 if (!(fb->panel->cntl & CNTL_LCDTFT)) 140 caps &= ~CLCD_CAP_888; 141 142 memset(&var->transp, 0, sizeof(var->transp)); 143 144 var->red.msb_right = 0; 145 var->green.msb_right = 0; 146 var->blue.msb_right = 0; 147 148 switch (var->bits_per_pixel) { 149 case 1: 150 case 2: 151 case 4: 152 case 8: 153 /* If we can't do 5551, reject */ 154 caps &= CLCD_CAP_5551; 155 if (!caps) { 156 ret = -EINVAL; 157 break; 158 } 159 160 var->red.length = var->bits_per_pixel; 161 var->red.offset = 0; 162 var->green.length = var->bits_per_pixel; 163 var->green.offset = 0; 164 var->blue.length = var->bits_per_pixel; 165 var->blue.offset = 0; 166 break; 167 168 case 16: 169 /* If we can't do 444, 5551 or 565, reject */ 170 if (!(caps & (CLCD_CAP_444 | CLCD_CAP_5551 | CLCD_CAP_565))) { 171 ret = -EINVAL; 172 break; 173 } 174 175 /* 176 * Green length can be 4, 5 or 6 depending whether 177 * we're operating in 444, 5551 or 565 mode. 178 */ 179 if (var->green.length == 4 && caps & CLCD_CAP_444) 180 caps &= CLCD_CAP_444; 181 if (var->green.length == 5 && caps & CLCD_CAP_5551) 182 caps &= CLCD_CAP_5551; 183 else if (var->green.length == 6 && caps & CLCD_CAP_565) 184 caps &= CLCD_CAP_565; 185 else { 186 /* 187 * PL110 officially only supports RGB555, 188 * but may be wired up to allow RGB565. 189 */ 190 if (caps & CLCD_CAP_565) { 191 var->green.length = 6; 192 caps &= CLCD_CAP_565; 193 } else if (caps & CLCD_CAP_5551) { 194 var->green.length = 5; 195 caps &= CLCD_CAP_5551; 196 } else { 197 var->green.length = 4; 198 caps &= CLCD_CAP_444; 199 } 200 } 201 202 if (var->green.length >= 5) { 203 var->red.length = 5; 204 var->blue.length = 5; 205 } else { 206 var->red.length = 4; 207 var->blue.length = 4; 208 } 209 break; 210 case 32: 211 /* If we can't do 888, reject */ 212 caps &= CLCD_CAP_888; 213 if (!caps) { 214 ret = -EINVAL; 215 break; 216 } 217 218 var->red.length = 8; 219 var->green.length = 8; 220 var->blue.length = 8; 221 break; 222 default: 223 ret = -EINVAL; 224 break; 225 } 226 227 /* 228 * >= 16bpp displays have separate colour component bitfields 229 * encoded in the pixel data. Calculate their position from 230 * the bitfield length defined above. 231 */ 232 if (ret == 0 && var->bits_per_pixel >= 16) { 233 bool bgr, rgb; 234 235 bgr = caps & CLCD_CAP_BGR && var->blue.offset == 0; 236 rgb = caps & CLCD_CAP_RGB && var->red.offset == 0; 237 238 if (!bgr && !rgb) 239 /* 240 * The requested format was not possible, try just 241 * our capabilities. One of BGR or RGB must be 242 * supported. 243 */ 244 bgr = caps & CLCD_CAP_BGR; 245 246 if (bgr) { 247 var->blue.offset = 0; 248 var->green.offset = var->blue.offset + var->blue.length; 249 var->red.offset = var->green.offset + var->green.length; 250 } else { 251 var->red.offset = 0; 252 var->green.offset = var->red.offset + var->red.length; 253 var->blue.offset = var->green.offset + var->green.length; 254 } 255 } 256 257 return ret; 258 } 259 260 static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 261 { 262 struct clcd_fb *fb = to_clcd(info); 263 int ret = -EINVAL; 264 265 if (fb->board->check) 266 ret = fb->board->check(fb, var); 267 268 if (ret == 0 && 269 var->xres_virtual * var->bits_per_pixel / 8 * 270 var->yres_virtual > fb->fb.fix.smem_len) 271 ret = -EINVAL; 272 273 if (ret == 0) 274 ret = clcdfb_set_bitfields(fb, var); 275 276 return ret; 277 } 278 279 static int clcdfb_set_par(struct fb_info *info) 280 { 281 struct clcd_fb *fb = to_clcd(info); 282 struct clcd_regs regs; 283 284 fb->fb.fix.line_length = fb->fb.var.xres_virtual * 285 fb->fb.var.bits_per_pixel / 8; 286 287 if (fb->fb.var.bits_per_pixel <= 8) 288 fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR; 289 else 290 fb->fb.fix.visual = FB_VISUAL_TRUECOLOR; 291 292 fb->board->decode(fb, ®s); 293 294 clcdfb_disable(fb); 295 296 writel(regs.tim0, fb->regs + CLCD_TIM0); 297 writel(regs.tim1, fb->regs + CLCD_TIM1); 298 writel(regs.tim2, fb->regs + CLCD_TIM2); 299 writel(regs.tim3, fb->regs + CLCD_TIM3); 300 301 clcdfb_set_start(fb); 302 303 clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000); 304 305 fb->clcd_cntl = regs.cntl; 306 307 clcdfb_enable(fb, regs.cntl); 308 309 #ifdef DEBUG 310 printk(KERN_INFO 311 "CLCD: Registers set to\n" 312 " %08x %08x %08x %08x\n" 313 " %08x %08x %08x %08x\n", 314 readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1), 315 readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3), 316 readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS), 317 readl(fb->regs + fb->off_ienb), readl(fb->regs + fb->off_cntl)); 318 #endif 319 320 return 0; 321 } 322 323 static inline u32 convert_bitfield(int val, struct fb_bitfield *bf) 324 { 325 unsigned int mask = (1 << bf->length) - 1; 326 327 return (val >> (16 - bf->length) & mask) << bf->offset; 328 } 329 330 /* 331 * Set a single color register. The values supplied have a 16 bit 332 * magnitude. Return != 0 for invalid regno. 333 */ 334 static int 335 clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green, 336 unsigned int blue, unsigned int transp, struct fb_info *info) 337 { 338 struct clcd_fb *fb = to_clcd(info); 339 340 if (regno < 16) 341 fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) | 342 convert_bitfield(blue, &fb->fb.var.blue) | 343 convert_bitfield(green, &fb->fb.var.green) | 344 convert_bitfield(red, &fb->fb.var.red); 345 346 if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) { 347 int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3); 348 u32 val, mask, newval; 349 350 newval = (red >> 11) & 0x001f; 351 newval |= (green >> 6) & 0x03e0; 352 newval |= (blue >> 1) & 0x7c00; 353 354 /* 355 * 3.2.11: if we're configured for big endian 356 * byte order, the palette entries are swapped. 357 */ 358 if (fb->clcd_cntl & CNTL_BEBO) 359 regno ^= 1; 360 361 if (regno & 1) { 362 newval <<= 16; 363 mask = 0x0000ffff; 364 } else { 365 mask = 0xffff0000; 366 } 367 368 val = readl(fb->regs + hw_reg) & mask; 369 writel(val | newval, fb->regs + hw_reg); 370 } 371 372 return regno > 255; 373 } 374 375 /* 376 * Blank the screen if blank_mode != 0, else unblank. If blank == NULL 377 * then the caller blanks by setting the CLUT (Color Look Up Table) to all 378 * black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due 379 * to e.g. a video mode which doesn't support it. Implements VESA suspend 380 * and powerdown modes on hardware that supports disabling hsync/vsync: 381 * blank_mode == 2: suspend vsync 382 * blank_mode == 3: suspend hsync 383 * blank_mode == 4: powerdown 384 */ 385 static int clcdfb_blank(int blank_mode, struct fb_info *info) 386 { 387 struct clcd_fb *fb = to_clcd(info); 388 389 if (blank_mode != 0) { 390 clcdfb_disable(fb); 391 } else { 392 clcdfb_enable(fb, fb->clcd_cntl); 393 } 394 return 0; 395 } 396 397 static int clcdfb_mmap(struct fb_info *info, 398 struct vm_area_struct *vma) 399 { 400 struct clcd_fb *fb = to_clcd(info); 401 unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT; 402 int ret = -EINVAL; 403 404 len = info->fix.smem_len; 405 406 if (off <= len && vma->vm_end - vma->vm_start <= len - off && 407 fb->board->mmap) 408 ret = fb->board->mmap(fb, vma); 409 410 return ret; 411 } 412 413 static const struct fb_ops clcdfb_ops = { 414 .owner = THIS_MODULE, 415 .fb_check_var = clcdfb_check_var, 416 .fb_set_par = clcdfb_set_par, 417 .fb_setcolreg = clcdfb_setcolreg, 418 .fb_blank = clcdfb_blank, 419 .fb_fillrect = cfb_fillrect, 420 .fb_copyarea = cfb_copyarea, 421 .fb_imageblit = cfb_imageblit, 422 .fb_mmap = clcdfb_mmap, 423 }; 424 425 static int clcdfb_register(struct clcd_fb *fb) 426 { 427 int ret; 428 429 /* 430 * ARM PL111 always has IENB at 0x1c; it's only PL110 431 * which is reversed on some platforms. 432 */ 433 if (amba_manf(fb->dev) == 0x41 && amba_part(fb->dev) == 0x111) { 434 fb->off_ienb = CLCD_PL111_IENB; 435 fb->off_cntl = CLCD_PL111_CNTL; 436 } else { 437 fb->off_ienb = CLCD_PL110_IENB; 438 fb->off_cntl = CLCD_PL110_CNTL; 439 } 440 441 fb->clk = clk_get(&fb->dev->dev, NULL); 442 if (IS_ERR(fb->clk)) { 443 ret = PTR_ERR(fb->clk); 444 goto out; 445 } 446 447 ret = clk_prepare(fb->clk); 448 if (ret) 449 goto free_clk; 450 451 fb->fb.device = &fb->dev->dev; 452 453 fb->fb.fix.mmio_start = fb->dev->res.start; 454 fb->fb.fix.mmio_len = resource_size(&fb->dev->res); 455 456 fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len); 457 if (!fb->regs) { 458 printk(KERN_ERR "CLCD: unable to remap registers\n"); 459 ret = -ENOMEM; 460 goto clk_unprep; 461 } 462 463 fb->fb.fbops = &clcdfb_ops; 464 fb->fb.flags = FBINFO_FLAG_DEFAULT; 465 fb->fb.pseudo_palette = fb->cmap; 466 467 strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id)); 468 fb->fb.fix.type = FB_TYPE_PACKED_PIXELS; 469 fb->fb.fix.type_aux = 0; 470 fb->fb.fix.xpanstep = 0; 471 fb->fb.fix.ypanstep = 0; 472 fb->fb.fix.ywrapstep = 0; 473 fb->fb.fix.accel = FB_ACCEL_NONE; 474 475 fb->fb.var.xres = fb->panel->mode.xres; 476 fb->fb.var.yres = fb->panel->mode.yres; 477 fb->fb.var.xres_virtual = fb->panel->mode.xres; 478 fb->fb.var.yres_virtual = fb->panel->mode.yres; 479 fb->fb.var.bits_per_pixel = fb->panel->bpp; 480 fb->fb.var.grayscale = fb->panel->grayscale; 481 fb->fb.var.pixclock = fb->panel->mode.pixclock; 482 fb->fb.var.left_margin = fb->panel->mode.left_margin; 483 fb->fb.var.right_margin = fb->panel->mode.right_margin; 484 fb->fb.var.upper_margin = fb->panel->mode.upper_margin; 485 fb->fb.var.lower_margin = fb->panel->mode.lower_margin; 486 fb->fb.var.hsync_len = fb->panel->mode.hsync_len; 487 fb->fb.var.vsync_len = fb->panel->mode.vsync_len; 488 fb->fb.var.sync = fb->panel->mode.sync; 489 fb->fb.var.vmode = fb->panel->mode.vmode; 490 fb->fb.var.activate = FB_ACTIVATE_NOW; 491 fb->fb.var.nonstd = 0; 492 fb->fb.var.height = fb->panel->height; 493 fb->fb.var.width = fb->panel->width; 494 fb->fb.var.accel_flags = 0; 495 496 fb->fb.monspecs.hfmin = 0; 497 fb->fb.monspecs.hfmax = 100000; 498 fb->fb.monspecs.vfmin = 0; 499 fb->fb.monspecs.vfmax = 400; 500 fb->fb.monspecs.dclkmin = 1000000; 501 fb->fb.monspecs.dclkmax = 100000000; 502 503 /* 504 * Make sure that the bitfields are set appropriately. 505 */ 506 clcdfb_set_bitfields(fb, &fb->fb.var); 507 508 /* 509 * Allocate colourmap. 510 */ 511 ret = fb_alloc_cmap(&fb->fb.cmap, 256, 0); 512 if (ret) 513 goto unmap; 514 515 /* 516 * Ensure interrupts are disabled. 517 */ 518 writel(0, fb->regs + fb->off_ienb); 519 520 fb_set_var(&fb->fb, &fb->fb.var); 521 522 dev_info(&fb->dev->dev, "%s hardware, %s display\n", 523 fb->board->name, fb->panel->mode.name); 524 525 ret = register_framebuffer(&fb->fb); 526 if (ret == 0) 527 goto out; 528 529 printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret); 530 531 fb_dealloc_cmap(&fb->fb.cmap); 532 unmap: 533 iounmap(fb->regs); 534 clk_unprep: 535 clk_unprepare(fb->clk); 536 free_clk: 537 clk_put(fb->clk); 538 out: 539 return ret; 540 } 541 542 #ifdef CONFIG_OF 543 static int clcdfb_of_get_dpi_panel_mode(struct device_node *node, 544 struct clcd_panel *clcd_panel) 545 { 546 int err; 547 struct display_timing timing; 548 struct videomode video; 549 550 err = of_get_display_timing(node, "panel-timing", &timing); 551 if (err) { 552 pr_err("%pOF: problems parsing panel-timing (%d)\n", node, err); 553 return err; 554 } 555 556 videomode_from_timing(&timing, &video); 557 558 err = fb_videomode_from_videomode(&video, &clcd_panel->mode); 559 if (err) 560 return err; 561 562 /* Set up some inversion flags */ 563 if (timing.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE) 564 clcd_panel->tim2 |= TIM2_IPC; 565 else if (!(timing.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)) 566 /* 567 * To preserve backwards compatibility, the IPC (inverted 568 * pixel clock) flag needs to be set on any display that 569 * doesn't explicitly specify that the pixel clock is 570 * active on the negative or positive edge. 571 */ 572 clcd_panel->tim2 |= TIM2_IPC; 573 574 if (timing.flags & DISPLAY_FLAGS_HSYNC_LOW) 575 clcd_panel->tim2 |= TIM2_IHS; 576 577 if (timing.flags & DISPLAY_FLAGS_VSYNC_LOW) 578 clcd_panel->tim2 |= TIM2_IVS; 579 580 if (timing.flags & DISPLAY_FLAGS_DE_LOW) 581 clcd_panel->tim2 |= TIM2_IOE; 582 583 return 0; 584 } 585 586 static int clcdfb_snprintf_mode(char *buf, int size, struct fb_videomode *mode) 587 { 588 return snprintf(buf, size, "%ux%u@%u", mode->xres, mode->yres, 589 mode->refresh); 590 } 591 592 static int clcdfb_of_get_backlight(struct device *dev, 593 struct clcd_panel *clcd_panel) 594 { 595 struct backlight_device *backlight; 596 597 /* Look up the optional backlight device */ 598 backlight = devm_of_find_backlight(dev); 599 if (IS_ERR(backlight)) 600 return PTR_ERR(backlight); 601 602 clcd_panel->backlight = backlight; 603 return 0; 604 } 605 606 static int clcdfb_of_get_mode(struct device *dev, struct device_node *panel, 607 struct clcd_panel *clcd_panel) 608 { 609 int err; 610 struct fb_videomode *mode; 611 char *name; 612 int len; 613 614 /* Only directly connected DPI panels supported for now */ 615 if (of_device_is_compatible(panel, "panel-dpi")) 616 err = clcdfb_of_get_dpi_panel_mode(panel, clcd_panel); 617 else 618 err = -ENOENT; 619 if (err) 620 return err; 621 mode = &clcd_panel->mode; 622 623 len = clcdfb_snprintf_mode(NULL, 0, mode); 624 name = devm_kzalloc(dev, len + 1, GFP_KERNEL); 625 if (!name) 626 return -ENOMEM; 627 628 clcdfb_snprintf_mode(name, len + 1, mode); 629 mode->name = name; 630 631 return 0; 632 } 633 634 static int clcdfb_of_init_tft_panel(struct clcd_fb *fb, u32 r0, u32 g0, u32 b0) 635 { 636 static struct { 637 unsigned int part; 638 u32 r0, g0, b0; 639 u32 caps; 640 } panels[] = { 641 { 0x110, 1, 7, 13, CLCD_CAP_5551 }, 642 { 0x110, 0, 8, 16, CLCD_CAP_888 }, 643 { 0x110, 16, 8, 0, CLCD_CAP_888 }, 644 { 0x111, 4, 14, 20, CLCD_CAP_444 }, 645 { 0x111, 3, 11, 19, CLCD_CAP_444 | CLCD_CAP_5551 }, 646 { 0x111, 3, 10, 19, CLCD_CAP_444 | CLCD_CAP_5551 | 647 CLCD_CAP_565 }, 648 { 0x111, 0, 8, 16, CLCD_CAP_444 | CLCD_CAP_5551 | 649 CLCD_CAP_565 | CLCD_CAP_888 }, 650 }; 651 int i; 652 653 /* Bypass pixel clock divider */ 654 fb->panel->tim2 |= TIM2_BCD; 655 656 /* TFT display, vert. comp. interrupt at the start of the back porch */ 657 fb->panel->cntl |= CNTL_LCDTFT | CNTL_LCDVCOMP(1); 658 659 fb->panel->caps = 0; 660 661 /* Match the setup with known variants */ 662 for (i = 0; i < ARRAY_SIZE(panels) && !fb->panel->caps; i++) { 663 if (amba_part(fb->dev) != panels[i].part) 664 continue; 665 if (g0 != panels[i].g0) 666 continue; 667 if (r0 == panels[i].r0 && b0 == panels[i].b0) 668 fb->panel->caps = panels[i].caps; 669 } 670 671 /* 672 * If we actually physically connected the R lines to B and 673 * vice versa 674 */ 675 if (r0 != 0 && b0 == 0) 676 fb->panel->bgr_connection = true; 677 678 return fb->panel->caps ? 0 : -EINVAL; 679 } 680 681 static int clcdfb_of_init_display(struct clcd_fb *fb) 682 { 683 struct device_node *endpoint, *panel; 684 int err; 685 unsigned int bpp; 686 u32 max_bandwidth; 687 u32 tft_r0b0g0[3]; 688 689 fb->panel = devm_kzalloc(&fb->dev->dev, sizeof(*fb->panel), GFP_KERNEL); 690 if (!fb->panel) 691 return -ENOMEM; 692 693 /* 694 * Fetch the panel endpoint. 695 */ 696 endpoint = of_graph_get_next_endpoint(fb->dev->dev.of_node, NULL); 697 if (!endpoint) 698 return -ENODEV; 699 700 panel = of_graph_get_remote_port_parent(endpoint); 701 if (!panel) { 702 err = -ENODEV; 703 goto out_endpoint_put; 704 } 705 706 err = clcdfb_of_get_backlight(&fb->dev->dev, fb->panel); 707 if (err) 708 goto out_panel_put; 709 710 err = clcdfb_of_get_mode(&fb->dev->dev, panel, fb->panel); 711 if (err) 712 goto out_panel_put; 713 714 err = of_property_read_u32(fb->dev->dev.of_node, "max-memory-bandwidth", 715 &max_bandwidth); 716 if (!err) { 717 /* 718 * max_bandwidth is in bytes per second and pixclock in 719 * pico-seconds, so the maximum allowed bits per pixel is 720 * 8 * max_bandwidth / (PICOS2KHZ(pixclock) * 1000) 721 * Rearrange this calculation to avoid overflow and then ensure 722 * result is a valid format. 723 */ 724 bpp = max_bandwidth / (1000 / 8) 725 / PICOS2KHZ(fb->panel->mode.pixclock); 726 bpp = rounddown_pow_of_two(bpp); 727 if (bpp > 32) 728 bpp = 32; 729 } else 730 bpp = 32; 731 fb->panel->bpp = bpp; 732 733 #ifdef CONFIG_CPU_BIG_ENDIAN 734 fb->panel->cntl |= CNTL_BEBO; 735 #endif 736 fb->panel->width = -1; 737 fb->panel->height = -1; 738 739 if (of_property_read_u32_array(endpoint, 740 "arm,pl11x,tft-r0g0b0-pads", 741 tft_r0b0g0, ARRAY_SIZE(tft_r0b0g0)) != 0) { 742 err = -ENOENT; 743 goto out_panel_put; 744 } 745 746 of_node_put(panel); 747 of_node_put(endpoint); 748 749 return clcdfb_of_init_tft_panel(fb, tft_r0b0g0[0], 750 tft_r0b0g0[1], tft_r0b0g0[2]); 751 out_panel_put: 752 of_node_put(panel); 753 out_endpoint_put: 754 of_node_put(endpoint); 755 return err; 756 } 757 758 static int clcdfb_of_vram_setup(struct clcd_fb *fb) 759 { 760 int err; 761 struct device_node *memory; 762 u64 size; 763 764 err = clcdfb_of_init_display(fb); 765 if (err) 766 return err; 767 768 memory = of_parse_phandle(fb->dev->dev.of_node, "memory-region", 0); 769 if (!memory) 770 return -ENODEV; 771 772 fb->fb.screen_base = of_iomap(memory, 0); 773 if (!fb->fb.screen_base) { 774 of_node_put(memory); 775 return -ENOMEM; 776 } 777 778 fb->fb.fix.smem_start = of_translate_address(memory, 779 of_get_address(memory, 0, &size, NULL)); 780 fb->fb.fix.smem_len = size; 781 of_node_put(memory); 782 783 return 0; 784 } 785 786 static int clcdfb_of_vram_mmap(struct clcd_fb *fb, struct vm_area_struct *vma) 787 { 788 unsigned long off, user_size, kernel_size; 789 790 791 off = vma->vm_pgoff << PAGE_SHIFT; 792 user_size = vma->vm_end - vma->vm_start; 793 kernel_size = fb->fb.fix.smem_len; 794 795 if (off >= kernel_size || user_size > (kernel_size - off)) 796 return -ENXIO; 797 798 return remap_pfn_range(vma, vma->vm_start, 799 __phys_to_pfn(fb->fb.fix.smem_start) + vma->vm_pgoff, 800 user_size, 801 pgprot_writecombine(vma->vm_page_prot)); 802 } 803 804 static void clcdfb_of_vram_remove(struct clcd_fb *fb) 805 { 806 iounmap(fb->fb.screen_base); 807 } 808 809 static int clcdfb_of_dma_setup(struct clcd_fb *fb) 810 { 811 unsigned long framesize; 812 dma_addr_t dma; 813 int err; 814 815 err = clcdfb_of_init_display(fb); 816 if (err) 817 return err; 818 819 framesize = PAGE_ALIGN(fb->panel->mode.xres * fb->panel->mode.yres * 820 fb->panel->bpp / 8); 821 fb->fb.screen_base = dma_alloc_coherent(&fb->dev->dev, framesize, 822 &dma, GFP_KERNEL); 823 if (!fb->fb.screen_base) 824 return -ENOMEM; 825 826 fb->fb.fix.smem_start = dma; 827 fb->fb.fix.smem_len = framesize; 828 829 return 0; 830 } 831 832 static int clcdfb_of_dma_mmap(struct clcd_fb *fb, struct vm_area_struct *vma) 833 { 834 return dma_mmap_wc(&fb->dev->dev, vma, fb->fb.screen_base, 835 fb->fb.fix.smem_start, fb->fb.fix.smem_len); 836 } 837 838 static void clcdfb_of_dma_remove(struct clcd_fb *fb) 839 { 840 dma_free_coherent(&fb->dev->dev, fb->fb.fix.smem_len, 841 fb->fb.screen_base, fb->fb.fix.smem_start); 842 } 843 844 static struct clcd_board *clcdfb_of_get_board(struct amba_device *dev) 845 { 846 struct clcd_board *board = devm_kzalloc(&dev->dev, sizeof(*board), 847 GFP_KERNEL); 848 struct device_node *node = dev->dev.of_node; 849 850 if (!board) 851 return NULL; 852 853 board->name = of_node_full_name(node); 854 board->caps = CLCD_CAP_ALL; 855 board->check = clcdfb_check; 856 board->decode = clcdfb_decode; 857 if (of_property_present(node, "memory-region")) { 858 board->setup = clcdfb_of_vram_setup; 859 board->mmap = clcdfb_of_vram_mmap; 860 board->remove = clcdfb_of_vram_remove; 861 } else { 862 board->setup = clcdfb_of_dma_setup; 863 board->mmap = clcdfb_of_dma_mmap; 864 board->remove = clcdfb_of_dma_remove; 865 } 866 867 return board; 868 } 869 #else 870 static struct clcd_board *clcdfb_of_get_board(struct amba_device *dev) 871 { 872 return NULL; 873 } 874 #endif 875 876 static int clcdfb_probe(struct amba_device *dev, const struct amba_id *id) 877 { 878 struct clcd_board *board = dev_get_platdata(&dev->dev); 879 struct clcd_fb *fb; 880 int ret; 881 882 if (!board) 883 board = clcdfb_of_get_board(dev); 884 885 if (!board) 886 return -EINVAL; 887 888 ret = dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32)); 889 if (ret) 890 goto out; 891 892 ret = amba_request_regions(dev, NULL); 893 if (ret) { 894 printk(KERN_ERR "CLCD: unable to reserve regs region\n"); 895 goto out; 896 } 897 898 fb = kzalloc(sizeof(*fb), GFP_KERNEL); 899 if (!fb) { 900 ret = -ENOMEM; 901 goto free_region; 902 } 903 904 fb->dev = dev; 905 fb->board = board; 906 907 dev_info(&fb->dev->dev, "PL%03x designer %02x rev%u at 0x%08llx\n", 908 amba_part(dev), amba_manf(dev), amba_rev(dev), 909 (unsigned long long)dev->res.start); 910 911 ret = fb->board->setup(fb); 912 if (ret) 913 goto free_fb; 914 915 ret = clcdfb_register(fb); 916 if (ret == 0) { 917 amba_set_drvdata(dev, fb); 918 goto out; 919 } 920 921 fb->board->remove(fb); 922 free_fb: 923 kfree(fb); 924 free_region: 925 amba_release_regions(dev); 926 out: 927 return ret; 928 } 929 930 static void clcdfb_remove(struct amba_device *dev) 931 { 932 struct clcd_fb *fb = amba_get_drvdata(dev); 933 934 clcdfb_disable(fb); 935 unregister_framebuffer(&fb->fb); 936 if (fb->fb.cmap.len) 937 fb_dealloc_cmap(&fb->fb.cmap); 938 iounmap(fb->regs); 939 clk_unprepare(fb->clk); 940 clk_put(fb->clk); 941 942 fb->board->remove(fb); 943 944 kfree(fb); 945 946 amba_release_regions(dev); 947 } 948 949 static const struct amba_id clcdfb_id_table[] = { 950 { 951 .id = 0x00041110, 952 .mask = 0x000ffffe, 953 }, 954 { 0, 0 }, 955 }; 956 957 MODULE_DEVICE_TABLE(amba, clcdfb_id_table); 958 959 static struct amba_driver clcd_driver = { 960 .drv = { 961 .name = "clcd-pl11x", 962 }, 963 .probe = clcdfb_probe, 964 .remove = clcdfb_remove, 965 .id_table = clcdfb_id_table, 966 }; 967 968 static int __init amba_clcdfb_init(void) 969 { 970 if (fb_get_options("ambafb", NULL)) 971 return -ENODEV; 972 973 return amba_driver_register(&clcd_driver); 974 } 975 976 module_init(amba_clcdfb_init); 977 978 static void __exit amba_clcdfb_exit(void) 979 { 980 amba_driver_unregister(&clcd_driver); 981 } 982 983 module_exit(amba_clcdfb_exit); 984 985 MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver"); 986 MODULE_LICENSE("GPL"); 987