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; 141 u32 words; 142 int index; 143 144 if (!fbdev) 145 return -EINVAL; 146 147 info = &fbdev->info; 148 149 /* Update var-dependent FB info */ 150 if (panel_is_active(fbdev->panel) || panel_is_color(fbdev->panel)) { 151 if (info->var.bits_per_pixel <= 8) { 152 /* palettized */ 153 info->var.red.offset = 0; 154 info->var.red.length = info->var.bits_per_pixel; 155 info->var.red.msb_right = 0; 156 157 info->var.green.offset = 0; 158 info->var.green.length = info->var.bits_per_pixel; 159 info->var.green.msb_right = 0; 160 161 info->var.blue.offset = 0; 162 info->var.blue.length = info->var.bits_per_pixel; 163 info->var.blue.msb_right = 0; 164 165 info->var.transp.offset = 0; 166 info->var.transp.length = 0; 167 info->var.transp.msb_right = 0; 168 169 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 170 info->fix.line_length = info->var.xres_virtual / 171 (8/info->var.bits_per_pixel); 172 } else { 173 /* non-palettized */ 174 index = (fbdev->panel->control_base & LCD_CONTROL_SBPPF_MASK) >> LCD_CONTROL_SBPPF_BIT; 175 info->var.red = rgb_bitfields[index][0]; 176 info->var.green = rgb_bitfields[index][1]; 177 info->var.blue = rgb_bitfields[index][2]; 178 info->var.transp = rgb_bitfields[index][3]; 179 180 info->fix.visual = FB_VISUAL_TRUECOLOR; 181 info->fix.line_length = info->var.xres_virtual << 1; /* depth=16 */ 182 } 183 } else { 184 /* mono */ 185 info->fix.visual = FB_VISUAL_MONO10; 186 info->fix.line_length = info->var.xres_virtual / 8; 187 } 188 189 info->screen_size = info->fix.line_length * info->var.yres_virtual; 190 info->var.rotate = ((fbdev->panel->control_base&LCD_CONTROL_SM_MASK) \ 191 >> LCD_CONTROL_SM_BIT) * 90; 192 193 /* Determine BPP mode and format */ 194 fbdev->regs->lcd_control = fbdev->panel->control_base; 195 fbdev->regs->lcd_horztiming = fbdev->panel->horztiming; 196 fbdev->regs->lcd_verttiming = fbdev->panel->verttiming; 197 fbdev->regs->lcd_clkcontrol = fbdev->panel->clkcontrol_base; 198 fbdev->regs->lcd_intenable = 0; 199 fbdev->regs->lcd_intstatus = 0; 200 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(fbdev->fb_phys); 201 202 if (panel_is_dual(fbdev->panel)) { 203 /* Second panel display seconf half of screen if possible, 204 * otherwise display the same as the first panel */ 205 if (info->var.yres_virtual >= (info->var.yres << 1)) { 206 fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys + 207 (info->fix.line_length * 208 (info->var.yres_virtual >> 1))); 209 } else { 210 fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys); 211 } 212 } 213 214 words = info->fix.line_length / sizeof(u32); 215 if (!info->var.rotate || (info->var.rotate == 180)) { 216 words *= info->var.yres_virtual; 217 if (info->var.rotate /* 180 */) { 218 words -= (words % 8); /* should be divisable by 8 */ 219 } 220 } 221 fbdev->regs->lcd_words = LCD_WRD_WRDS_N(words); 222 223 fbdev->regs->lcd_pwmdiv = 0; 224 fbdev->regs->lcd_pwmhi = 0; 225 226 /* Resume controller */ 227 fbdev->regs->lcd_control |= LCD_CONTROL_GO; 228 mdelay(10); 229 au1100fb_fb_blank(VESA_NO_BLANKING, info); 230 231 return 0; 232 } 233 234 /* fb_setcolreg 235 * Set color in LCD palette. 236 */ 237 int au1100fb_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi) 238 { 239 struct au1100fb_device *fbdev; 240 u32 *palette; 241 u32 value; 242 243 fbdev = to_au1100fb_device(fbi); 244 palette = fbdev->regs->lcd_palettebase; 245 246 if (regno > (AU1100_LCD_NBR_PALETTE_ENTRIES - 1)) 247 return -EINVAL; 248 249 if (fbi->var.grayscale) { 250 /* Convert color to grayscale */ 251 red = green = blue = 252 (19595 * red + 38470 * green + 7471 * blue) >> 16; 253 } 254 255 if (fbi->fix.visual == FB_VISUAL_TRUECOLOR) { 256 /* Place color in the pseudopalette */ 257 if (regno > 16) 258 return -EINVAL; 259 260 palette = (u32*)fbi->pseudo_palette; 261 262 red >>= (16 - fbi->var.red.length); 263 green >>= (16 - fbi->var.green.length); 264 blue >>= (16 - fbi->var.blue.length); 265 266 value = (red << fbi->var.red.offset) | 267 (green << fbi->var.green.offset)| 268 (blue << fbi->var.blue.offset); 269 value &= 0xFFFF; 270 271 } else if (panel_is_active(fbdev->panel)) { 272 /* COLOR TFT PALLETTIZED (use RGB 565) */ 273 value = (red & 0xF800)|((green >> 5) & 0x07E0)|((blue >> 11) & 0x001F); 274 value &= 0xFFFF; 275 276 } else if (panel_is_color(fbdev->panel)) { 277 /* COLOR STN MODE */ 278 value = (((panel_swap_rgb(fbdev->panel) ? blue : red) >> 12) & 0x000F) | 279 ((green >> 8) & 0x00F0) | 280 (((panel_swap_rgb(fbdev->panel) ? red : blue) >> 4) & 0x0F00); 281 value &= 0xFFF; 282 } else { 283 /* MONOCHROME MODE */ 284 value = (green >> 12) & 0x000F; 285 value &= 0xF; 286 } 287 288 palette[regno] = value; 289 290 return 0; 291 } 292 293 /* fb_pan_display 294 * Pan display in x and/or y as specified 295 */ 296 int au1100fb_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi) 297 { 298 struct au1100fb_device *fbdev; 299 int dy; 300 301 fbdev = to_au1100fb_device(fbi); 302 303 print_dbg("fb_pan_display %p %p", var, fbi); 304 305 if (!var || !fbdev) { 306 return -EINVAL; 307 } 308 309 if (var->xoffset - fbi->var.xoffset) { 310 /* No support for X panning for now! */ 311 return -EINVAL; 312 } 313 314 print_dbg("fb_pan_display 2 %p %p", var, fbi); 315 dy = var->yoffset - fbi->var.yoffset; 316 if (dy) { 317 318 u32 dmaaddr; 319 320 print_dbg("Panning screen of %d lines", dy); 321 322 dmaaddr = fbdev->regs->lcd_dmaaddr0; 323 dmaaddr += (fbi->fix.line_length * dy); 324 325 /* TODO: Wait for current frame to finished */ 326 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr); 327 328 if (panel_is_dual(fbdev->panel)) { 329 dmaaddr = fbdev->regs->lcd_dmaaddr1; 330 dmaaddr += (fbi->fix.line_length * dy); 331 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr); 332 } 333 } 334 print_dbg("fb_pan_display 3 %p %p", var, fbi); 335 336 return 0; 337 } 338 339 /* fb_mmap 340 * Map video memory in user space. We don't use the generic fb_mmap method mainly 341 * to allow the use of the TLB streaming flag (CCA=6) 342 */ 343 int au1100fb_fb_mmap(struct fb_info *fbi, struct vm_area_struct *vma) 344 { 345 struct au1100fb_device *fbdev = to_au1100fb_device(fbi); 346 347 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 348 349 pgprot_val(vma->vm_page_prot) |= (6 << 9); //CCA=6 350 351 return dma_mmap_coherent(fbdev->dev, vma, fbdev->fb_mem, fbdev->fb_phys, 352 fbdev->fb_len); 353 } 354 355 static const struct fb_ops au1100fb_ops = { 356 .owner = THIS_MODULE, 357 __FB_DEFAULT_IOMEM_OPS_RDWR, 358 .fb_setcolreg = au1100fb_fb_setcolreg, 359 .fb_blank = au1100fb_fb_blank, 360 .fb_pan_display = au1100fb_fb_pan_display, 361 __FB_DEFAULT_IOMEM_OPS_DRAW, 362 .fb_mmap = au1100fb_fb_mmap, 363 }; 364 365 366 /*-------------------------------------------------------------------------*/ 367 368 static int au1100fb_setup(struct au1100fb_device *fbdev) 369 { 370 char *this_opt, *options; 371 int num_panels = ARRAY_SIZE(known_lcd_panels); 372 373 if (num_panels <= 0) { 374 print_err("No LCD panels supported by driver!"); 375 return -ENODEV; 376 } 377 378 if (fb_get_options(DRIVER_NAME, &options)) 379 return -ENODEV; 380 if (!options) 381 return -ENODEV; 382 383 while ((this_opt = strsep(&options, ",")) != NULL) { 384 /* Panel option */ 385 if (!strncmp(this_opt, "panel:", 6)) { 386 int i; 387 this_opt += 6; 388 for (i = 0; i < num_panels; i++) { 389 if (!strncmp(this_opt, known_lcd_panels[i].name, 390 strlen(this_opt))) { 391 fbdev->panel = &known_lcd_panels[i]; 392 fbdev->panel_idx = i; 393 break; 394 } 395 } 396 if (i >= num_panels) { 397 print_warn("Panel '%s' not supported!", this_opt); 398 return -ENODEV; 399 } 400 } 401 /* Unsupported option */ 402 else 403 print_warn("Unsupported option \"%s\"", this_opt); 404 } 405 406 print_info("Panel=%s", fbdev->panel->name); 407 408 return 0; 409 } 410 411 static int au1100fb_drv_probe(struct platform_device *dev) 412 { 413 struct au1100fb_device *fbdev; 414 struct resource *regs_res; 415 struct clk *c; 416 417 /* Allocate new device private */ 418 fbdev = devm_kzalloc(&dev->dev, sizeof(*fbdev), GFP_KERNEL); 419 if (!fbdev) 420 return -ENOMEM; 421 422 if (au1100fb_setup(fbdev)) 423 goto failed; 424 425 platform_set_drvdata(dev, (void *)fbdev); 426 fbdev->dev = &dev->dev; 427 428 /* Allocate region for our registers and map them */ 429 regs_res = platform_get_resource(dev, IORESOURCE_MEM, 0); 430 if (!regs_res) { 431 print_err("fail to retrieve registers resource"); 432 return -EFAULT; 433 } 434 435 au1100fb_fix.mmio_start = regs_res->start; 436 au1100fb_fix.mmio_len = resource_size(regs_res); 437 438 if (!devm_request_mem_region(&dev->dev, 439 au1100fb_fix.mmio_start, 440 au1100fb_fix.mmio_len, 441 DRIVER_NAME)) { 442 print_err("fail to lock memory region at 0x%08lx", 443 au1100fb_fix.mmio_start); 444 return -EBUSY; 445 } 446 447 fbdev->regs = (struct au1100fb_regs*)KSEG1ADDR(au1100fb_fix.mmio_start); 448 449 print_dbg("Register memory map at %p", fbdev->regs); 450 print_dbg("phys=0x%08x, size=%d", fbdev->regs_phys, fbdev->regs_len); 451 452 c = clk_get(NULL, "lcd_intclk"); 453 if (!IS_ERR(c)) { 454 fbdev->lcdclk = c; 455 clk_set_rate(c, 48000000); 456 clk_prepare_enable(c); 457 } 458 459 /* Allocate the framebuffer to the maximum screen size * nbr of video buffers */ 460 fbdev->fb_len = fbdev->panel->xres * fbdev->panel->yres * 461 (fbdev->panel->bpp >> 3) * AU1100FB_NBR_VIDEO_BUFFERS; 462 463 fbdev->fb_mem = dmam_alloc_coherent(&dev->dev, 464 PAGE_ALIGN(fbdev->fb_len), 465 &fbdev->fb_phys, GFP_KERNEL); 466 if (!fbdev->fb_mem) { 467 print_err("fail to allocate framebuffer (size: %dK))", 468 fbdev->fb_len / 1024); 469 return -ENOMEM; 470 } 471 472 au1100fb_fix.smem_start = fbdev->fb_phys; 473 au1100fb_fix.smem_len = fbdev->fb_len; 474 475 print_dbg("Framebuffer memory map at %p", fbdev->fb_mem); 476 print_dbg("phys=0x%08x, size=%dK", fbdev->fb_phys, fbdev->fb_len / 1024); 477 478 /* load the panel info into the var struct */ 479 au1100fb_var.bits_per_pixel = fbdev->panel->bpp; 480 au1100fb_var.xres = fbdev->panel->xres; 481 au1100fb_var.xres_virtual = au1100fb_var.xres; 482 au1100fb_var.yres = fbdev->panel->yres; 483 au1100fb_var.yres_virtual = au1100fb_var.yres; 484 485 fbdev->info.screen_base = fbdev->fb_mem; 486 fbdev->info.fbops = &au1100fb_ops; 487 fbdev->info.fix = au1100fb_fix; 488 489 fbdev->info.pseudo_palette = 490 devm_kcalloc(&dev->dev, 16, sizeof(u32), GFP_KERNEL); 491 if (!fbdev->info.pseudo_palette) 492 return -ENOMEM; 493 494 if (fb_alloc_cmap(&fbdev->info.cmap, AU1100_LCD_NBR_PALETTE_ENTRIES, 0) < 0) { 495 print_err("Fail to allocate colormap (%d entries)", 496 AU1100_LCD_NBR_PALETTE_ENTRIES); 497 return -EFAULT; 498 } 499 500 fbdev->info.var = au1100fb_var; 501 502 /* Set h/w registers */ 503 au1100fb_setmode(fbdev); 504 505 /* Register new framebuffer */ 506 if (register_framebuffer(&fbdev->info) < 0) { 507 print_err("cannot register new framebuffer"); 508 goto failed; 509 } 510 511 return 0; 512 513 failed: 514 if (fbdev->lcdclk) { 515 clk_disable_unprepare(fbdev->lcdclk); 516 clk_put(fbdev->lcdclk); 517 } 518 if (fbdev->info.cmap.len != 0) { 519 fb_dealloc_cmap(&fbdev->info.cmap); 520 } 521 522 return -ENODEV; 523 } 524 525 void au1100fb_drv_remove(struct platform_device *dev) 526 { 527 struct au1100fb_device *fbdev = NULL; 528 529 fbdev = platform_get_drvdata(dev); 530 531 #if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO) 532 au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info); 533 #endif 534 fbdev->regs->lcd_control &= ~LCD_CONTROL_GO; 535 536 /* Clean up all probe data */ 537 unregister_framebuffer(&fbdev->info); 538 539 fb_dealloc_cmap(&fbdev->info.cmap); 540 541 if (fbdev->lcdclk) { 542 clk_disable_unprepare(fbdev->lcdclk); 543 clk_put(fbdev->lcdclk); 544 } 545 } 546 547 #ifdef CONFIG_PM 548 static struct au1100fb_regs fbregs; 549 550 int au1100fb_drv_suspend(struct platform_device *dev, pm_message_t state) 551 { 552 struct au1100fb_device *fbdev = platform_get_drvdata(dev); 553 554 if (!fbdev) 555 return 0; 556 557 /* Blank the LCD */ 558 au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info); 559 560 clk_disable(fbdev->lcdclk); 561 562 memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs)); 563 564 return 0; 565 } 566 567 int au1100fb_drv_resume(struct platform_device *dev) 568 { 569 struct au1100fb_device *fbdev = platform_get_drvdata(dev); 570 571 if (!fbdev) 572 return 0; 573 574 memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs)); 575 576 clk_enable(fbdev->lcdclk); 577 578 /* Unblank the LCD */ 579 au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info); 580 581 return 0; 582 } 583 #else 584 #define au1100fb_drv_suspend NULL 585 #define au1100fb_drv_resume NULL 586 #endif 587 588 static struct platform_driver au1100fb_driver = { 589 .driver = { 590 .name = "au1100-lcd", 591 }, 592 .probe = au1100fb_drv_probe, 593 .remove = au1100fb_drv_remove, 594 .suspend = au1100fb_drv_suspend, 595 .resume = au1100fb_drv_resume, 596 }; 597 module_platform_driver(au1100fb_driver); 598 599 MODULE_DESCRIPTION(DRIVER_DESC); 600 MODULE_LICENSE("GPL"); 601