drivers/video/fbdev/au1100fb.c

   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_pallettebase;
 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;
 344
 345         fbdev = to_au1100fb_device(fbi);
 346
 347         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 348         pgprot_val(vma->vm_page_prot) |= (6 << 9); //CCA=6
 349
 350         return vm_iomap_memory(vma, fbdev->fb_phys, fbdev->fb_len);
 351 }
 352
 353 static struct fb_ops au1100fb_ops =
 354 {
 355         .owner                  = THIS_MODULE,
 356         .fb_setcolreg           = au1100fb_fb_setcolreg,
 357         .fb_blank               = au1100fb_fb_blank,
 358         .fb_pan_display         = au1100fb_fb_pan_display,
 359         .fb_fillrect            = cfb_fillrect,
 360         .fb_copyarea            = cfb_copyarea,
 361         .fb_imageblit           = cfb_imageblit,
 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         unsigned long page;
 416         struct clk *c;
 417
 418         /* Allocate new device private */
 419         fbdev = devm_kzalloc(&dev->dev, sizeof(*fbdev), GFP_KERNEL);
 420         if (!fbdev)
 421                 return -ENOMEM;
 422
 423         if (au1100fb_setup(fbdev))
 424                 goto failed;
 425
 426         platform_set_drvdata(dev, (void *)fbdev);
 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         /*
 476          * Set page reserved so that mmap will work. This is necessary
 477          * since we'll be remapping normal memory.
 478          */
 479         for (page = (unsigned long)fbdev->fb_mem;
 480              page < PAGE_ALIGN((unsigned long)fbdev->fb_mem + fbdev->fb_len);
 481              page += PAGE_SIZE) {
 482 #ifdef CONFIG_DMA_NONCOHERENT
 483                 SetPageReserved(virt_to_page(CAC_ADDR((void *)page)));
 484 #else
 485                 SetPageReserved(virt_to_page(page));
 486 #endif
 487         }
 488
 489         print_dbg("Framebuffer memory map at %p", fbdev->fb_mem);
 490         print_dbg("phys=0x%08x, size=%dK", fbdev->fb_phys, fbdev->fb_len / 1024);
 491
 492         /* load the panel info into the var struct */
 493         au1100fb_var.bits_per_pixel = fbdev->panel->bpp;
 494         au1100fb_var.xres = fbdev->panel->xres;
 495         au1100fb_var.xres_virtual = au1100fb_var.xres;
 496         au1100fb_var.yres = fbdev->panel->yres;
 497         au1100fb_var.yres_virtual = au1100fb_var.yres;
 498
 499         fbdev->info.screen_base = fbdev->fb_mem;
 500         fbdev->info.fbops = &au1100fb_ops;
 501         fbdev->info.fix = au1100fb_fix;
 502
 503         fbdev->info.pseudo_palette =
 504                 devm_kcalloc(&dev->dev, 16, sizeof(u32), GFP_KERNEL);
 505         if (!fbdev->info.pseudo_palette)
 506                 return -ENOMEM;
 507
 508         if (fb_alloc_cmap(&fbdev->info.cmap, AU1100_LCD_NBR_PALETTE_ENTRIES, 0) < 0) {
 509                 print_err("Fail to allocate colormap (%d entries)",
 510                            AU1100_LCD_NBR_PALETTE_ENTRIES);
 511                 return -EFAULT;
 512         }
 513
 514         fbdev->info.var = au1100fb_var;
 515
 516         /* Set h/w registers */
 517         au1100fb_setmode(fbdev);
 518
 519         /* Register new framebuffer */
 520         if (register_framebuffer(&fbdev->info) < 0) {
 521                 print_err("cannot register new framebuffer");
 522                 goto failed;
 523         }
 524
 525         return 0;
 526
 527 failed:
 528         if (fbdev->lcdclk) {
 529                 clk_disable_unprepare(fbdev->lcdclk);
 530                 clk_put(fbdev->lcdclk);
 531         }
 532         if (fbdev->info.cmap.len != 0) {
 533                 fb_dealloc_cmap(&fbdev->info.cmap);
 534         }
 535
 536         return -ENODEV;
 537 }
 538
 539 int au1100fb_drv_remove(struct platform_device *dev)
 540 {
 541         struct au1100fb_device *fbdev = NULL;
 542
 543         if (!dev)
 544                 return -ENODEV;
 545
 546         fbdev = platform_get_drvdata(dev);
 547
 548 #if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO)
 549         au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
 550 #endif
 551         fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
 552
 553         /* Clean up all probe data */
 554         unregister_framebuffer(&fbdev->info);
 555
 556         fb_dealloc_cmap(&fbdev->info.cmap);
 557
 558         if (fbdev->lcdclk) {
 559                 clk_disable_unprepare(fbdev->lcdclk);
 560                 clk_put(fbdev->lcdclk);
 561         }
 562
 563         return 0;
 564 }
 565
 566 #ifdef CONFIG_PM
 567 static struct au1100fb_regs fbregs;
 568
 569 int au1100fb_drv_suspend(struct platform_device *dev, pm_message_t state)
 570 {
 571         struct au1100fb_device *fbdev = platform_get_drvdata(dev);
 572
 573         if (!fbdev)
 574                 return 0;
 575
 576         /* Blank the LCD */
 577         au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
 578
 579         if (fbdev->lcdclk)
 580                 clk_disable(fbdev->lcdclk);
 581
 582         memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
 583
 584         return 0;
 585 }
 586
 587 int au1100fb_drv_resume(struct platform_device *dev)
 588 {
 589         struct au1100fb_device *fbdev = platform_get_drvdata(dev);
 590
 591         if (!fbdev)
 592                 return 0;
 593
 594         memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
 595
 596         if (fbdev->lcdclk)
 597                 clk_enable(fbdev->lcdclk);
 598
 599         /* Unblank the LCD */
 600         au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);
 601
 602         return 0;
 603 }
 604 #else
 605 #define au1100fb_drv_suspend NULL
 606 #define au1100fb_drv_resume NULL
 607 #endif
 608
 609 static struct platform_driver au1100fb_driver = {
 610         .driver = {
 611                 .name           = "au1100-lcd",
 612         },
 613         .probe          = au1100fb_drv_probe,
 614         .remove         = au1100fb_drv_remove,
 615         .suspend        = au1100fb_drv_suspend,
 616         .resume         = au1100fb_drv_resume,
 617 };
 618 module_platform_driver(au1100fb_driver);
 619
 620 MODULE_DESCRIPTION(DRIVER_DESC);
 621 MODULE_LICENSE("GPL");