1 /* 2 * BRIEF MODULE DESCRIPTION 3 * Au1100 LCD Driver. 4 * 5 * Rewritten for 2.6 by Embedded Alley Solutions 6 * <source@embeddedalley.com>, based on submissions by 7 * Karl Lessard <klessard@sunrisetelecom.com> 8 * <c.pellegrin@exadron.com> 9 * 10 * PM support added by Rodolfo Giometti <giometti@linux.it> 11 * Cursor enable/disable by Rodolfo Giometti <giometti@linux.it> 12 * 13 * Copyright 2002 MontaVista Software 14 * Author: MontaVista Software, Inc. 15 * ppopov@mvista.com or source@mvista.com 16 * 17 * Copyright 2002 Alchemy Semiconductor 18 * Author: Alchemy Semiconductor 19 * 20 * Based on: 21 * linux/drivers/video/skeletonfb.c -- Skeleton for a frame buffer device 22 * Created 28 Dec 1997 by Geert Uytterhoeven 23 * 24 * This program is free software; you can redistribute it and/or modify it 25 * under the terms of the GNU General Public License as published by the 26 * Free Software Foundation; either version 2 of the License, or (at your 27 * option) any later version. 28 * 29 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 30 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 31 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 32 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 35 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 36 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * You should have received a copy of the GNU General Public License along 41 * with this program; if not, write to the Free Software Foundation, Inc., 42 * 675 Mass Ave, Cambridge, MA 02139, USA. 43 */ 44 #include <linux/clk.h> 45 #include <linux/module.h> 46 #include <linux/kernel.h> 47 #include <linux/errno.h> 48 #include <linux/string.h> 49 #include <linux/mm.h> 50 #include <linux/fb.h> 51 #include <linux/init.h> 52 #include <linux/interrupt.h> 53 #include <linux/ctype.h> 54 #include <linux/dma-mapping.h> 55 #include <linux/platform_device.h> 56 #include <linux/slab.h> 57 58 #include <asm/mach-au1x00/au1000.h> 59 60 #define DEBUG 0 61 62 #include "au1100fb.h" 63 64 #define DRIVER_NAME "au1100fb" 65 #define DRIVER_DESC "LCD controller driver for AU1100 processors" 66 67 #define to_au1100fb_device(_info) \ 68 (_info ? container_of(_info, struct au1100fb_device, info) : NULL); 69 70 /* Bitfields format supported by the controller. Note that the order of formats 71 * SHOULD be the same as in the LCD_CONTROL_SBPPF field, so we can retrieve the 72 * right pixel format by doing rgb_bitfields[LCD_CONTROL_SBPPF_XXX >> LCD_CONTROL_SBPPF] 73 */ 74 struct fb_bitfield rgb_bitfields[][4] = 75 { 76 /* Red, Green, Blue, Transp */ 77 { { 10, 6, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 0, 0, 0 } }, 78 { { 11, 5, 0 }, { 5, 6, 0 }, { 0, 5, 0 }, { 0, 0, 0 } }, 79 { { 11, 5, 0 }, { 6, 5, 0 }, { 0, 6, 0 }, { 0, 0, 0 } }, 80 { { 10, 5, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 15, 1, 0 } }, 81 { { 11, 5, 0 }, { 6, 5, 0 }, { 1, 5, 0 }, { 0, 1, 0 } }, 82 83 /* The last is used to describe 12bpp format */ 84 { { 8, 4, 0 }, { 4, 4, 0 }, { 0, 4, 0 }, { 0, 0, 0 } }, 85 }; 86 87 static struct fb_fix_screeninfo au1100fb_fix = { 88 .id = "AU1100 FB", 89 .xpanstep = 1, 90 .ypanstep = 1, 91 .type = FB_TYPE_PACKED_PIXELS, 92 .accel = FB_ACCEL_NONE, 93 }; 94 95 static struct fb_var_screeninfo au1100fb_var = { 96 .activate = FB_ACTIVATE_NOW, 97 .height = -1, 98 .width = -1, 99 .vmode = FB_VMODE_NONINTERLACED, 100 }; 101 102 /* fb_blank 103 * Blank the screen. Depending on the mode, the screen will be 104 * activated with the backlight color, or desactivated 105 */ 106 static int au1100fb_fb_blank(int blank_mode, struct fb_info *fbi) 107 { 108 struct au1100fb_device *fbdev = to_au1100fb_device(fbi); 109 110 print_dbg("fb_blank %d %p", blank_mode, fbi); 111 112 switch (blank_mode) { 113 114 case VESA_NO_BLANKING: 115 /* Turn on panel */ 116 fbdev->regs->lcd_control |= LCD_CONTROL_GO; 117 wmb(); /* drain writebuffer */ 118 break; 119 120 case VESA_VSYNC_SUSPEND: 121 case VESA_HSYNC_SUSPEND: 122 case VESA_POWERDOWN: 123 /* Turn off panel */ 124 fbdev->regs->lcd_control &= ~LCD_CONTROL_GO; 125 wmb(); /* drain writebuffer */ 126 break; 127 default: 128 break; 129 130 } 131 return 0; 132 } 133 134 /* 135 * Set hardware with var settings. This will enable the controller with a specific 136 * mode, normally validated with the fb_check_var method 137 */ 138 int au1100fb_setmode(struct au1100fb_device *fbdev) 139 { 140 struct fb_info *info = &fbdev->info; 141 u32 words; 142 int index; 143 144 if (!fbdev) 145 return -EINVAL; 146 147 /* Update var-dependent FB info */ 148 if (panel_is_active(fbdev->panel) || panel_is_color(fbdev->panel)) { 149 if (info->var.bits_per_pixel <= 8) { 150 /* palettized */ 151 info->var.red.offset = 0; 152 info->var.red.length = info->var.bits_per_pixel; 153 info->var.red.msb_right = 0; 154 155 info->var.green.offset = 0; 156 info->var.green.length = info->var.bits_per_pixel; 157 info->var.green.msb_right = 0; 158 159 info->var.blue.offset = 0; 160 info->var.blue.length = info->var.bits_per_pixel; 161 info->var.blue.msb_right = 0; 162 163 info->var.transp.offset = 0; 164 info->var.transp.length = 0; 165 info->var.transp.msb_right = 0; 166 167 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 168 info->fix.line_length = info->var.xres_virtual / 169 (8/info->var.bits_per_pixel); 170 } else { 171 /* non-palettized */ 172 index = (fbdev->panel->control_base & LCD_CONTROL_SBPPF_MASK) >> LCD_CONTROL_SBPPF_BIT; 173 info->var.red = rgb_bitfields[index][0]; 174 info->var.green = rgb_bitfields[index][1]; 175 info->var.blue = rgb_bitfields[index][2]; 176 info->var.transp = rgb_bitfields[index][3]; 177 178 info->fix.visual = FB_VISUAL_TRUECOLOR; 179 info->fix.line_length = info->var.xres_virtual << 1; /* depth=16 */ 180 } 181 } else { 182 /* mono */ 183 info->fix.visual = FB_VISUAL_MONO10; 184 info->fix.line_length = info->var.xres_virtual / 8; 185 } 186 187 info->screen_size = info->fix.line_length * info->var.yres_virtual; 188 info->var.rotate = ((fbdev->panel->control_base&LCD_CONTROL_SM_MASK) \ 189 >> LCD_CONTROL_SM_BIT) * 90; 190 191 /* Determine BPP mode and format */ 192 fbdev->regs->lcd_control = fbdev->panel->control_base; 193 fbdev->regs->lcd_horztiming = fbdev->panel->horztiming; 194 fbdev->regs->lcd_verttiming = fbdev->panel->verttiming; 195 fbdev->regs->lcd_clkcontrol = fbdev->panel->clkcontrol_base; 196 fbdev->regs->lcd_intenable = 0; 197 fbdev->regs->lcd_intstatus = 0; 198 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(fbdev->fb_phys); 199 200 if (panel_is_dual(fbdev->panel)) { 201 /* Second panel display seconf half of screen if possible, 202 * otherwise display the same as the first panel */ 203 if (info->var.yres_virtual >= (info->var.yres << 1)) { 204 fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys + 205 (info->fix.line_length * 206 (info->var.yres_virtual >> 1))); 207 } else { 208 fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys); 209 } 210 } 211 212 words = info->fix.line_length / sizeof(u32); 213 if (!info->var.rotate || (info->var.rotate == 180)) { 214 words *= info->var.yres_virtual; 215 if (info->var.rotate /* 180 */) { 216 words -= (words % 8); /* should be divisable by 8 */ 217 } 218 } 219 fbdev->regs->lcd_words = LCD_WRD_WRDS_N(words); 220 221 fbdev->regs->lcd_pwmdiv = 0; 222 fbdev->regs->lcd_pwmhi = 0; 223 224 /* Resume controller */ 225 fbdev->regs->lcd_control |= LCD_CONTROL_GO; 226 mdelay(10); 227 au1100fb_fb_blank(VESA_NO_BLANKING, info); 228 229 return 0; 230 } 231 232 /* fb_setcolreg 233 * Set color in LCD palette. 234 */ 235 int au1100fb_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi) 236 { 237 struct au1100fb_device *fbdev; 238 u32 *palette; 239 u32 value; 240 241 fbdev = to_au1100fb_device(fbi); 242 palette = fbdev->regs->lcd_palettebase; 243 244 if (regno > (AU1100_LCD_NBR_PALETTE_ENTRIES - 1)) 245 return -EINVAL; 246 247 if (fbi->var.grayscale) { 248 /* Convert color to grayscale */ 249 red = green = blue = 250 (19595 * red + 38470 * green + 7471 * blue) >> 16; 251 } 252 253 if (fbi->fix.visual == FB_VISUAL_TRUECOLOR) { 254 /* Place color in the pseudopalette */ 255 if (regno > 16) 256 return -EINVAL; 257 258 palette = (u32*)fbi->pseudo_palette; 259 260 red >>= (16 - fbi->var.red.length); 261 green >>= (16 - fbi->var.green.length); 262 blue >>= (16 - fbi->var.blue.length); 263 264 value = (red << fbi->var.red.offset) | 265 (green << fbi->var.green.offset)| 266 (blue << fbi->var.blue.offset); 267 value &= 0xFFFF; 268 269 } else if (panel_is_active(fbdev->panel)) { 270 /* COLOR TFT PALLETTIZED (use RGB 565) */ 271 value = (red & 0xF800)|((green >> 5) & 0x07E0)|((blue >> 11) & 0x001F); 272 value &= 0xFFFF; 273 274 } else if (panel_is_color(fbdev->panel)) { 275 /* COLOR STN MODE */ 276 value = (((panel_swap_rgb(fbdev->panel) ? blue : red) >> 12) & 0x000F) | 277 ((green >> 8) & 0x00F0) | 278 (((panel_swap_rgb(fbdev->panel) ? red : blue) >> 4) & 0x0F00); 279 value &= 0xFFF; 280 } else { 281 /* MONOCHROME MODE */ 282 value = (green >> 12) & 0x000F; 283 value &= 0xF; 284 } 285 286 palette[regno] = value; 287 288 return 0; 289 } 290 291 /* fb_pan_display 292 * Pan display in x and/or y as specified 293 */ 294 int au1100fb_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi) 295 { 296 struct au1100fb_device *fbdev; 297 int dy; 298 299 fbdev = to_au1100fb_device(fbi); 300 301 print_dbg("fb_pan_display %p %p", var, fbi); 302 303 if (!var || !fbdev) { 304 return -EINVAL; 305 } 306 307 if (var->xoffset - fbi->var.xoffset) { 308 /* No support for X panning for now! */ 309 return -EINVAL; 310 } 311 312 print_dbg("fb_pan_display 2 %p %p", var, fbi); 313 dy = var->yoffset - fbi->var.yoffset; 314 if (dy) { 315 316 u32 dmaaddr; 317 318 print_dbg("Panning screen of %d lines", dy); 319 320 dmaaddr = fbdev->regs->lcd_dmaaddr0; 321 dmaaddr += (fbi->fix.line_length * dy); 322 323 /* TODO: Wait for current frame to finished */ 324 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr); 325 326 if (panel_is_dual(fbdev->panel)) { 327 dmaaddr = fbdev->regs->lcd_dmaaddr1; 328 dmaaddr += (fbi->fix.line_length * dy); 329 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr); 330 } 331 } 332 print_dbg("fb_pan_display 3 %p %p", var, fbi); 333 334 return 0; 335 } 336 337 /* fb_mmap 338 * Map video memory in user space. We don't use the generic fb_mmap method mainly 339 * to allow the use of the TLB streaming flag (CCA=6) 340 */ 341 int au1100fb_fb_mmap(struct fb_info *fbi, struct vm_area_struct *vma) 342 { 343 struct au1100fb_device *fbdev = to_au1100fb_device(fbi); 344 345 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 346 347 pgprot_val(vma->vm_page_prot) |= (6 << 9); //CCA=6 348 349 return dma_mmap_coherent(fbdev->dev, vma, fbdev->fb_mem, fbdev->fb_phys, 350 fbdev->fb_len); 351 } 352 353 static const struct fb_ops au1100fb_ops = { 354 .owner = THIS_MODULE, 355 __FB_DEFAULT_IOMEM_OPS_RDWR, 356 .fb_setcolreg = au1100fb_fb_setcolreg, 357 .fb_blank = au1100fb_fb_blank, 358 .fb_pan_display = au1100fb_fb_pan_display, 359 __FB_DEFAULT_IOMEM_OPS_DRAW, 360 .fb_mmap = au1100fb_fb_mmap, 361 }; 362 363 364 /*-------------------------------------------------------------------------*/ 365 366 static int au1100fb_setup(struct au1100fb_device *fbdev) 367 { 368 char *this_opt, *options; 369 int num_panels = ARRAY_SIZE(known_lcd_panels); 370 371 if (num_panels <= 0) { 372 print_err("No LCD panels supported by driver!"); 373 return -ENODEV; 374 } 375 376 if (fb_get_options(DRIVER_NAME, &options)) 377 return -ENODEV; 378 if (!options) 379 return -ENODEV; 380 381 while ((this_opt = strsep(&options, ",")) != NULL) { 382 /* Panel option */ 383 if (!strncmp(this_opt, "panel:", 6)) { 384 int i; 385 this_opt += 6; 386 for (i = 0; i < num_panels; i++) { 387 if (!strncmp(this_opt, known_lcd_panels[i].name, 388 strlen(this_opt))) { 389 fbdev->panel = &known_lcd_panels[i]; 390 fbdev->panel_idx = i; 391 break; 392 } 393 } 394 if (i >= num_panels) { 395 print_warn("Panel '%s' not supported!", this_opt); 396 return -ENODEV; 397 } 398 } 399 /* Unsupported option */ 400 else 401 print_warn("Unsupported option \"%s\"", this_opt); 402 } 403 404 print_info("Panel=%s", fbdev->panel->name); 405 406 return 0; 407 } 408 409 static int au1100fb_drv_probe(struct platform_device *dev) 410 { 411 struct au1100fb_device *fbdev; 412 struct resource *regs_res; 413 struct clk *c; 414 415 /* Allocate new device private */ 416 fbdev = devm_kzalloc(&dev->dev, sizeof(*fbdev), GFP_KERNEL); 417 if (!fbdev) 418 return -ENOMEM; 419 420 if (au1100fb_setup(fbdev)) 421 goto failed; 422 423 platform_set_drvdata(dev, (void *)fbdev); 424 fbdev->dev = &dev->dev; 425 426 /* Allocate region for our registers and map them */ 427 regs_res = platform_get_resource(dev, IORESOURCE_MEM, 0); 428 if (!regs_res) { 429 print_err("fail to retrieve registers resource"); 430 return -EFAULT; 431 } 432 433 au1100fb_fix.mmio_start = regs_res->start; 434 au1100fb_fix.mmio_len = resource_size(regs_res); 435 436 if (!devm_request_mem_region(&dev->dev, 437 au1100fb_fix.mmio_start, 438 au1100fb_fix.mmio_len, 439 DRIVER_NAME)) { 440 print_err("fail to lock memory region at 0x%08lx", 441 au1100fb_fix.mmio_start); 442 return -EBUSY; 443 } 444 445 fbdev->regs = (struct au1100fb_regs*)KSEG1ADDR(au1100fb_fix.mmio_start); 446 447 print_dbg("Register memory map at %p", fbdev->regs); 448 print_dbg("phys=0x%08x, size=%d", fbdev->regs_phys, fbdev->regs_len); 449 450 c = clk_get(NULL, "lcd_intclk"); 451 if (!IS_ERR(c)) { 452 fbdev->lcdclk = c; 453 clk_set_rate(c, 48000000); 454 clk_prepare_enable(c); 455 } 456 457 /* Allocate the framebuffer to the maximum screen size * nbr of video buffers */ 458 fbdev->fb_len = fbdev->panel->xres * fbdev->panel->yres * 459 (fbdev->panel->bpp >> 3) * AU1100FB_NBR_VIDEO_BUFFERS; 460 461 fbdev->fb_mem = dmam_alloc_coherent(&dev->dev, 462 PAGE_ALIGN(fbdev->fb_len), 463 &fbdev->fb_phys, GFP_KERNEL); 464 if (!fbdev->fb_mem) { 465 print_err("fail to allocate framebuffer (size: %dK))", 466 fbdev->fb_len / 1024); 467 return -ENOMEM; 468 } 469 470 au1100fb_fix.smem_start = fbdev->fb_phys; 471 au1100fb_fix.smem_len = fbdev->fb_len; 472 473 print_dbg("Framebuffer memory map at %p", fbdev->fb_mem); 474 print_dbg("phys=0x%08x, size=%dK", fbdev->fb_phys, fbdev->fb_len / 1024); 475 476 /* load the panel info into the var struct */ 477 au1100fb_var.bits_per_pixel = fbdev->panel->bpp; 478 au1100fb_var.xres = fbdev->panel->xres; 479 au1100fb_var.xres_virtual = au1100fb_var.xres; 480 au1100fb_var.yres = fbdev->panel->yres; 481 au1100fb_var.yres_virtual = au1100fb_var.yres; 482 483 fbdev->info.screen_base = fbdev->fb_mem; 484 fbdev->info.fbops = &au1100fb_ops; 485 fbdev->info.fix = au1100fb_fix; 486 487 fbdev->info.pseudo_palette = 488 devm_kcalloc(&dev->dev, 16, sizeof(u32), GFP_KERNEL); 489 if (!fbdev->info.pseudo_palette) 490 return -ENOMEM; 491 492 if (fb_alloc_cmap(&fbdev->info.cmap, AU1100_LCD_NBR_PALETTE_ENTRIES, 0) < 0) { 493 print_err("Fail to allocate colormap (%d entries)", 494 AU1100_LCD_NBR_PALETTE_ENTRIES); 495 return -EFAULT; 496 } 497 498 fbdev->info.var = au1100fb_var; 499 500 /* Set h/w registers */ 501 au1100fb_setmode(fbdev); 502 503 /* Register new framebuffer */ 504 if (register_framebuffer(&fbdev->info) < 0) { 505 print_err("cannot register new framebuffer"); 506 goto failed; 507 } 508 509 return 0; 510 511 failed: 512 if (fbdev->lcdclk) { 513 clk_disable_unprepare(fbdev->lcdclk); 514 clk_put(fbdev->lcdclk); 515 } 516 if (fbdev->info.cmap.len != 0) { 517 fb_dealloc_cmap(&fbdev->info.cmap); 518 } 519 520 return -ENODEV; 521 } 522 523 void au1100fb_drv_remove(struct platform_device *dev) 524 { 525 struct au1100fb_device *fbdev = NULL; 526 527 fbdev = platform_get_drvdata(dev); 528 529 #if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO) 530 au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info); 531 #endif 532 fbdev->regs->lcd_control &= ~LCD_CONTROL_GO; 533 534 /* Clean up all probe data */ 535 unregister_framebuffer(&fbdev->info); 536 537 fb_dealloc_cmap(&fbdev->info.cmap); 538 539 if (fbdev->lcdclk) { 540 clk_disable_unprepare(fbdev->lcdclk); 541 clk_put(fbdev->lcdclk); 542 } 543 } 544 545 #ifdef CONFIG_PM 546 static struct au1100fb_regs fbregs; 547 548 int au1100fb_drv_suspend(struct platform_device *dev, pm_message_t state) 549 { 550 struct au1100fb_device *fbdev = platform_get_drvdata(dev); 551 552 if (!fbdev) 553 return 0; 554 555 /* Blank the LCD */ 556 au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info); 557 558 clk_disable(fbdev->lcdclk); 559 560 memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs)); 561 562 return 0; 563 } 564 565 int au1100fb_drv_resume(struct platform_device *dev) 566 { 567 struct au1100fb_device *fbdev = platform_get_drvdata(dev); 568 569 if (!fbdev) 570 return 0; 571 572 memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs)); 573 574 clk_enable(fbdev->lcdclk); 575 576 /* Unblank the LCD */ 577 au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info); 578 579 return 0; 580 } 581 #else 582 #define au1100fb_drv_suspend NULL 583 #define au1100fb_drv_resume NULL 584 #endif 585 586 static struct platform_driver au1100fb_driver = { 587 .driver = { 588 .name = "au1100-lcd", 589 }, 590 .probe = au1100fb_drv_probe, 591 .remove_new = au1100fb_drv_remove, 592 .suspend = au1100fb_drv_suspend, 593 .resume = au1100fb_drv_resume, 594 }; 595 module_platform_driver(au1100fb_driver); 596 597 MODULE_DESCRIPTION(DRIVER_DESC); 598 MODULE_LICENSE("GPL"); 599