linux/drivers/video/au1100fb.c
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   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/module.h>
  45#include <linux/kernel.h>
  46#include <linux/errno.h>
  47#include <linux/string.h>
  48#include <linux/mm.h>
  49#include <linux/fb.h>
  50#include <linux/init.h>
  51#include <linux/interrupt.h>
  52#include <linux/ctype.h>
  53#include <linux/dma-mapping.h>
  54#include <linux/platform_device.h>
  55#include <linux/slab.h>
  56
  57#include <asm/mach-au1x00/au1000.h>
  58
  59#define DEBUG 0
  60
  61#include "au1100fb.h"
  62
  63#define DRIVER_NAME "au1100fb"
  64#define DRIVER_DESC "LCD controller driver for AU1100 processors"
  65
  66#define to_au1100fb_device(_info) \
  67          (_info ? container_of(_info, struct au1100fb_device, info) : NULL);
  68
  69/* Bitfields format supported by the controller. Note that the order of formats
  70 * SHOULD be the same as in the LCD_CONTROL_SBPPF field, so we can retrieve the
  71 * right pixel format by doing rgb_bitfields[LCD_CONTROL_SBPPF_XXX >> LCD_CONTROL_SBPPF]
  72 */
  73struct fb_bitfield rgb_bitfields[][4] =
  74{
  75        /*     Red,        Green,        Blue,       Transp   */
  76        { { 10, 6, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 0, 0, 0 } },
  77        { { 11, 5, 0 }, { 5, 6, 0 }, { 0, 5, 0 }, { 0, 0, 0 } },
  78        { { 11, 5, 0 }, { 6, 5, 0 }, { 0, 6, 0 }, { 0, 0, 0 } },
  79        { { 10, 5, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 15, 1, 0 } },
  80        { { 11, 5, 0 }, { 6, 5, 0 }, { 1, 5, 0 }, { 0, 1, 0 } },
  81
  82        /* The last is used to describe 12bpp format */
  83        { { 8, 4, 0 },  { 4, 4, 0 }, { 0, 4, 0 }, { 0, 0, 0 } },
  84};
  85
  86static struct fb_fix_screeninfo au1100fb_fix = {
  87        .id             = "AU1100 FB",
  88        .xpanstep       = 1,
  89        .ypanstep       = 1,
  90        .type           = FB_TYPE_PACKED_PIXELS,
  91        .accel          = FB_ACCEL_NONE,
  92};
  93
  94static struct fb_var_screeninfo au1100fb_var = {
  95        .activate       = FB_ACTIVATE_NOW,
  96        .height         = -1,
  97        .width          = -1,
  98        .vmode          = FB_VMODE_NONINTERLACED,
  99};
 100
 101/* fb_blank
 102 * Blank the screen. Depending on the mode, the screen will be
 103 * activated with the backlight color, or desactivated
 104 */
 105static int au1100fb_fb_blank(int blank_mode, struct fb_info *fbi)
 106{
 107        struct au1100fb_device *fbdev = to_au1100fb_device(fbi);
 108
 109        print_dbg("fb_blank %d %p", blank_mode, fbi);
 110
 111        switch (blank_mode) {
 112
 113        case VESA_NO_BLANKING:
 114                /* Turn on panel */
 115                fbdev->regs->lcd_control |= LCD_CONTROL_GO;
 116                au_sync();
 117                break;
 118
 119        case VESA_VSYNC_SUSPEND:
 120        case VESA_HSYNC_SUSPEND:
 121        case VESA_POWERDOWN:
 122                /* Turn off panel */
 123                fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
 124                au_sync();
 125                break;
 126        default:
 127                break;
 128
 129        }
 130        return 0;
 131}
 132
 133/*
 134 * Set hardware with var settings. This will enable the controller with a specific
 135 * mode, normally validated with the fb_check_var method
 136         */
 137int au1100fb_setmode(struct au1100fb_device *fbdev)
 138{
 139        struct fb_info *info = &fbdev->info;
 140        u32 words;
 141        int index;
 142
 143        if (!fbdev)
 144                return -EINVAL;
 145
 146        /* Update var-dependent FB info */
 147        if (panel_is_active(fbdev->panel) || panel_is_color(fbdev->panel)) {
 148                if (info->var.bits_per_pixel <= 8) {
 149                        /* palettized */
 150                        info->var.red.offset    = 0;
 151                        info->var.red.length    = info->var.bits_per_pixel;
 152                        info->var.red.msb_right = 0;
 153
 154                        info->var.green.offset  = 0;
 155                        info->var.green.length  = info->var.bits_per_pixel;
 156                        info->var.green.msb_right = 0;
 157
 158                        info->var.blue.offset   = 0;
 159                        info->var.blue.length   = info->var.bits_per_pixel;
 160                        info->var.blue.msb_right = 0;
 161
 162                        info->var.transp.offset = 0;
 163                        info->var.transp.length = 0;
 164                        info->var.transp.msb_right = 0;
 165
 166                        info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 167                        info->fix.line_length = info->var.xres_virtual /
 168                                                        (8/info->var.bits_per_pixel);
 169                } else {
 170                        /* non-palettized */
 171                        index = (fbdev->panel->control_base & LCD_CONTROL_SBPPF_MASK) >> LCD_CONTROL_SBPPF_BIT;
 172                        info->var.red = rgb_bitfields[index][0];
 173                        info->var.green = rgb_bitfields[index][1];
 174                        info->var.blue = rgb_bitfields[index][2];
 175                        info->var.transp = rgb_bitfields[index][3];
 176
 177                        info->fix.visual = FB_VISUAL_TRUECOLOR;
 178                        info->fix.line_length = info->var.xres_virtual << 1; /* depth=16 */
 179                }
 180        } else {
 181                /* mono */
 182                info->fix.visual = FB_VISUAL_MONO10;
 183                info->fix.line_length = info->var.xres_virtual / 8;
 184        }
 185
 186        info->screen_size = info->fix.line_length * info->var.yres_virtual;
 187        info->var.rotate = ((fbdev->panel->control_base&LCD_CONTROL_SM_MASK) \
 188                                >> LCD_CONTROL_SM_BIT) * 90;
 189
 190        /* Determine BPP mode and format */
 191        fbdev->regs->lcd_control = fbdev->panel->control_base;
 192        fbdev->regs->lcd_horztiming = fbdev->panel->horztiming;
 193        fbdev->regs->lcd_verttiming = fbdev->panel->verttiming;
 194        fbdev->regs->lcd_clkcontrol = fbdev->panel->clkcontrol_base;
 195        fbdev->regs->lcd_intenable = 0;
 196        fbdev->regs->lcd_intstatus = 0;
 197        fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(fbdev->fb_phys);
 198
 199        if (panel_is_dual(fbdev->panel)) {
 200                /* Second panel display seconf half of screen if possible,
 201                 * otherwise display the same as the first panel */
 202                if (info->var.yres_virtual >= (info->var.yres << 1)) {
 203                        fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys +
 204                                                          (info->fix.line_length *
 205                                                          (info->var.yres_virtual >> 1)));
 206                } else {
 207                        fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys);
 208                }
 209        }
 210
 211        words = info->fix.line_length / sizeof(u32);
 212        if (!info->var.rotate || (info->var.rotate == 180)) {
 213                words *= info->var.yres_virtual;
 214                if (info->var.rotate /* 180 */) {
 215                        words -= (words % 8); /* should be divisable by 8 */
 216                }
 217        }
 218        fbdev->regs->lcd_words = LCD_WRD_WRDS_N(words);
 219
 220        fbdev->regs->lcd_pwmdiv = 0;
 221        fbdev->regs->lcd_pwmhi = 0;
 222
 223        /* Resume controller */
 224        fbdev->regs->lcd_control |= LCD_CONTROL_GO;
 225        mdelay(10);
 226        au1100fb_fb_blank(VESA_NO_BLANKING, info);
 227
 228        return 0;
 229}
 230
 231/* fb_setcolreg
 232 * Set color in LCD palette.
 233 */
 234int au1100fb_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi)
 235{
 236        struct au1100fb_device *fbdev;
 237        u32 *palette;
 238        u32 value;
 239
 240        fbdev = to_au1100fb_device(fbi);
 241        palette = fbdev->regs->lcd_pallettebase;
 242
 243        if (regno > (AU1100_LCD_NBR_PALETTE_ENTRIES - 1))
 244                return -EINVAL;
 245
 246        if (fbi->var.grayscale) {
 247                /* Convert color to grayscale */
 248                red = green = blue =
 249                        (19595 * red + 38470 * green + 7471 * blue) >> 16;
 250        }
 251
 252        if (fbi->fix.visual == FB_VISUAL_TRUECOLOR) {
 253                /* Place color in the pseudopalette */
 254                if (regno > 16)
 255                        return -EINVAL;
 256
 257                palette = (u32*)fbi->pseudo_palette;
 258
 259                red   >>= (16 - fbi->var.red.length);
 260                green >>= (16 - fbi->var.green.length);
 261                blue  >>= (16 - fbi->var.blue.length);
 262
 263                value = (red   << fbi->var.red.offset)  |
 264                        (green << fbi->var.green.offset)|
 265                        (blue  << fbi->var.blue.offset);
 266                value &= 0xFFFF;
 267
 268        } else if (panel_is_active(fbdev->panel)) {
 269                /* COLOR TFT PALLETTIZED (use RGB 565) */
 270                value = (red & 0xF800)|((green >> 5) & 0x07E0)|((blue >> 11) & 0x001F);
 271                value &= 0xFFFF;
 272
 273        } else if (panel_is_color(fbdev->panel)) {
 274                /* COLOR STN MODE */
 275                value = (((panel_swap_rgb(fbdev->panel) ? blue : red) >> 12) & 0x000F) |
 276                        ((green >> 8) & 0x00F0) |
 277                        (((panel_swap_rgb(fbdev->panel) ? red : blue) >> 4) & 0x0F00);
 278                value &= 0xFFF;
 279        } else {
 280                /* MONOCHROME MODE */
 281                value = (green >> 12) & 0x000F;
 282                value &= 0xF;
 283        }
 284
 285        palette[regno] = value;
 286
 287        return 0;
 288}
 289
 290/* fb_pan_display
 291 * Pan display in x and/or y as specified
 292 */
 293int au1100fb_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)
 294{
 295        struct au1100fb_device *fbdev;
 296        int dy;
 297
 298        fbdev = to_au1100fb_device(fbi);
 299
 300        print_dbg("fb_pan_display %p %p", var, fbi);
 301
 302        if (!var || !fbdev) {
 303                return -EINVAL;
 304        }
 305
 306        if (var->xoffset - fbi->var.xoffset) {
 307                /* No support for X panning for now! */
 308                return -EINVAL;
 309        }
 310
 311        print_dbg("fb_pan_display 2 %p %p", var, fbi);
 312        dy = var->yoffset - fbi->var.yoffset;
 313        if (dy) {
 314
 315                u32 dmaaddr;
 316
 317                print_dbg("Panning screen of %d lines", dy);
 318
 319                dmaaddr = fbdev->regs->lcd_dmaaddr0;
 320                dmaaddr += (fbi->fix.line_length * dy);
 321
 322                /* TODO: Wait for current frame to finished */
 323                fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
 324
 325                if (panel_is_dual(fbdev->panel)) {
 326                        dmaaddr = fbdev->regs->lcd_dmaaddr1;
 327                        dmaaddr += (fbi->fix.line_length * dy);
 328                        fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
 329        }
 330        }
 331        print_dbg("fb_pan_display 3 %p %p", var, fbi);
 332
 333        return 0;
 334}
 335
 336/* fb_rotate
 337 * Rotate the display of this angle. This doesn't seems to be used by the core,
 338 * but as our hardware supports it, so why not implementing it...
 339 */
 340void au1100fb_fb_rotate(struct fb_info *fbi, int angle)
 341{
 342        struct au1100fb_device *fbdev = to_au1100fb_device(fbi);
 343
 344        print_dbg("fb_rotate %p %d", fbi, angle);
 345
 346        if (fbdev && (angle > 0) && !(angle % 90)) {
 347
 348                fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
 349
 350                fbdev->regs->lcd_control &= ~(LCD_CONTROL_SM_MASK);
 351                fbdev->regs->lcd_control |= ((angle/90) << LCD_CONTROL_SM_BIT);
 352
 353                fbdev->regs->lcd_control |= LCD_CONTROL_GO;
 354        }
 355}
 356
 357/* fb_mmap
 358 * Map video memory in user space. We don't use the generic fb_mmap method mainly
 359 * to allow the use of the TLB streaming flag (CCA=6)
 360 */
 361int au1100fb_fb_mmap(struct fb_info *fbi, struct vm_area_struct *vma)
 362{
 363        struct au1100fb_device *fbdev;
 364        unsigned int len;
 365        unsigned long start=0, off;
 366
 367        fbdev = to_au1100fb_device(fbi);
 368
 369        if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) {
 370                return -EINVAL;
 371        }
 372
 373        start = fbdev->fb_phys & PAGE_MASK;
 374        len = PAGE_ALIGN((start & ~PAGE_MASK) + fbdev->fb_len);
 375
 376        off = vma->vm_pgoff << PAGE_SHIFT;
 377
 378        if ((vma->vm_end - vma->vm_start + off) > len) {
 379                return -EINVAL;
 380        }
 381
 382        off += start;
 383        vma->vm_pgoff = off >> PAGE_SHIFT;
 384
 385        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 386        pgprot_val(vma->vm_page_prot) |= (6 << 9); //CCA=6
 387
 388        vma->vm_flags |= VM_IO;
 389
 390        if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
 391                                vma->vm_end - vma->vm_start,
 392                                vma->vm_page_prot)) {
 393                return -EAGAIN;
 394        }
 395
 396        return 0;
 397}
 398
 399static struct fb_ops au1100fb_ops =
 400{
 401        .owner                  = THIS_MODULE,
 402        .fb_setcolreg           = au1100fb_fb_setcolreg,
 403        .fb_blank               = au1100fb_fb_blank,
 404        .fb_pan_display         = au1100fb_fb_pan_display,
 405        .fb_fillrect            = cfb_fillrect,
 406        .fb_copyarea            = cfb_copyarea,
 407        .fb_imageblit           = cfb_imageblit,
 408        .fb_rotate              = au1100fb_fb_rotate,
 409        .fb_mmap                = au1100fb_fb_mmap,
 410};
 411
 412
 413/*-------------------------------------------------------------------------*/
 414
 415static int au1100fb_setup(struct au1100fb_device *fbdev)
 416{
 417        char *this_opt, *options;
 418        int num_panels = ARRAY_SIZE(known_lcd_panels);
 419
 420        if (num_panels <= 0) {
 421                print_err("No LCD panels supported by driver!");
 422                return -ENODEV;
 423        }
 424
 425        if (fb_get_options(DRIVER_NAME, &options))
 426                return -ENODEV;
 427        if (!options)
 428                return -ENODEV;
 429
 430        while ((this_opt = strsep(&options, ",")) != NULL) {
 431                /* Panel option */
 432                if (!strncmp(this_opt, "panel:", 6)) {
 433                        int i;
 434                        this_opt += 6;
 435                        for (i = 0; i < num_panels; i++) {
 436                                if (!strncmp(this_opt, known_lcd_panels[i].name,
 437                                             strlen(this_opt))) {
 438                                        fbdev->panel = &known_lcd_panels[i];
 439                                        fbdev->panel_idx = i;
 440                                        break;
 441                                }
 442                        }
 443                        if (i >= num_panels) {
 444                                print_warn("Panel '%s' not supported!", this_opt);
 445                                return -ENODEV;
 446                        }
 447                }
 448                /* Unsupported option */
 449                else
 450                        print_warn("Unsupported option \"%s\"", this_opt);
 451        }
 452
 453        print_info("Panel=%s", fbdev->panel->name);
 454
 455        return 0;
 456}
 457
 458static int au1100fb_drv_probe(struct platform_device *dev)
 459{
 460        struct au1100fb_device *fbdev = NULL;
 461        struct resource *regs_res;
 462        unsigned long page;
 463        u32 sys_clksrc;
 464
 465        /* Allocate new device private */
 466        fbdev = devm_kzalloc(&dev->dev, sizeof(struct au1100fb_device),
 467                             GFP_KERNEL);
 468        if (!fbdev) {
 469                print_err("fail to allocate device private record");
 470                return -ENOMEM;
 471        }
 472
 473        if (au1100fb_setup(fbdev))
 474                goto failed;
 475
 476        platform_set_drvdata(dev, (void *)fbdev);
 477
 478        /* Allocate region for our registers and map them */
 479        regs_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 480        if (!regs_res) {
 481                print_err("fail to retrieve registers resource");
 482                return -EFAULT;
 483        }
 484
 485        au1100fb_fix.mmio_start = regs_res->start;
 486        au1100fb_fix.mmio_len = resource_size(regs_res);
 487
 488        if (!devm_request_mem_region(&dev->dev,
 489                                     au1100fb_fix.mmio_start,
 490                                     au1100fb_fix.mmio_len,
 491                                     DRIVER_NAME)) {
 492                print_err("fail to lock memory region at 0x%08lx",
 493                                au1100fb_fix.mmio_start);
 494                return -EBUSY;
 495        }
 496
 497        fbdev->regs = (struct au1100fb_regs*)KSEG1ADDR(au1100fb_fix.mmio_start);
 498
 499        print_dbg("Register memory map at %p", fbdev->regs);
 500        print_dbg("phys=0x%08x, size=%d", fbdev->regs_phys, fbdev->regs_len);
 501
 502        /* Allocate the framebuffer to the maximum screen size * nbr of video buffers */
 503        fbdev->fb_len = fbdev->panel->xres * fbdev->panel->yres *
 504                        (fbdev->panel->bpp >> 3) * AU1100FB_NBR_VIDEO_BUFFERS;
 505
 506        fbdev->fb_mem = dmam_alloc_coherent(&dev->dev,
 507                                            PAGE_ALIGN(fbdev->fb_len),
 508                                            &fbdev->fb_phys, GFP_KERNEL);
 509        if (!fbdev->fb_mem) {
 510                print_err("fail to allocate frambuffer (size: %dK))",
 511                          fbdev->fb_len / 1024);
 512                return -ENOMEM;
 513        }
 514
 515        au1100fb_fix.smem_start = fbdev->fb_phys;
 516        au1100fb_fix.smem_len = fbdev->fb_len;
 517
 518        /*
 519         * Set page reserved so that mmap will work. This is necessary
 520         * since we'll be remapping normal memory.
 521         */
 522        for (page = (unsigned long)fbdev->fb_mem;
 523             page < PAGE_ALIGN((unsigned long)fbdev->fb_mem + fbdev->fb_len);
 524             page += PAGE_SIZE) {
 525#ifdef CONFIG_DMA_NONCOHERENT
 526                SetPageReserved(virt_to_page(CAC_ADDR((void *)page)));
 527#else
 528                SetPageReserved(virt_to_page(page));
 529#endif
 530        }
 531
 532        print_dbg("Framebuffer memory map at %p", fbdev->fb_mem);
 533        print_dbg("phys=0x%08x, size=%dK", fbdev->fb_phys, fbdev->fb_len / 1024);
 534
 535        /* Setup LCD clock to AUX (48 MHz) */
 536        sys_clksrc = au_readl(SYS_CLKSRC) & ~(SYS_CS_ML_MASK | SYS_CS_DL | SYS_CS_CL);
 537        au_writel((sys_clksrc | (1 << SYS_CS_ML_BIT)), SYS_CLKSRC);
 538
 539        /* load the panel info into the var struct */
 540        au1100fb_var.bits_per_pixel = fbdev->panel->bpp;
 541        au1100fb_var.xres = fbdev->panel->xres;
 542        au1100fb_var.xres_virtual = au1100fb_var.xres;
 543        au1100fb_var.yres = fbdev->panel->yres;
 544        au1100fb_var.yres_virtual = au1100fb_var.yres;
 545
 546        fbdev->info.screen_base = fbdev->fb_mem;
 547        fbdev->info.fbops = &au1100fb_ops;
 548        fbdev->info.fix = au1100fb_fix;
 549
 550        fbdev->info.pseudo_palette =
 551                devm_kzalloc(&dev->dev, sizeof(u32) * 16, GFP_KERNEL);
 552        if (!fbdev->info.pseudo_palette)
 553                return -ENOMEM;
 554
 555        if (fb_alloc_cmap(&fbdev->info.cmap, AU1100_LCD_NBR_PALETTE_ENTRIES, 0) < 0) {
 556                print_err("Fail to allocate colormap (%d entries)",
 557                           AU1100_LCD_NBR_PALETTE_ENTRIES);
 558                return -EFAULT;
 559        }
 560
 561        fbdev->info.var = au1100fb_var;
 562
 563        /* Set h/w registers */
 564        au1100fb_setmode(fbdev);
 565
 566        /* Register new framebuffer */
 567        if (register_framebuffer(&fbdev->info) < 0) {
 568                print_err("cannot register new framebuffer");
 569                goto failed;
 570        }
 571
 572        return 0;
 573
 574failed:
 575        if (fbdev->fb_mem) {
 576                dma_free_noncoherent(&dev->dev, fbdev->fb_len, fbdev->fb_mem,
 577                                     fbdev->fb_phys);
 578        }
 579        if (fbdev->info.cmap.len != 0) {
 580                fb_dealloc_cmap(&fbdev->info.cmap);
 581        }
 582        platform_set_drvdata(dev, NULL);
 583
 584        return -ENODEV;
 585}
 586
 587int au1100fb_drv_remove(struct platform_device *dev)
 588{
 589        struct au1100fb_device *fbdev = NULL;
 590
 591        if (!dev)
 592                return -ENODEV;
 593
 594        fbdev = (struct au1100fb_device *) platform_get_drvdata(dev);
 595
 596#if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO)
 597        au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
 598#endif
 599        fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
 600
 601        /* Clean up all probe data */
 602        unregister_framebuffer(&fbdev->info);
 603
 604        fb_dealloc_cmap(&fbdev->info.cmap);
 605
 606        return 0;
 607}
 608
 609#ifdef CONFIG_PM
 610static u32 sys_clksrc;
 611static struct au1100fb_regs fbregs;
 612
 613int au1100fb_drv_suspend(struct platform_device *dev, pm_message_t state)
 614{
 615        struct au1100fb_device *fbdev = platform_get_drvdata(dev);
 616
 617        if (!fbdev)
 618                return 0;
 619
 620        /* Save the clock source state */
 621        sys_clksrc = au_readl(SYS_CLKSRC);
 622
 623        /* Blank the LCD */
 624        au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
 625
 626        /* Stop LCD clocking */
 627        au_writel(sys_clksrc & ~SYS_CS_ML_MASK, SYS_CLKSRC);
 628
 629        memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
 630
 631        return 0;
 632}
 633
 634int au1100fb_drv_resume(struct platform_device *dev)
 635{
 636        struct au1100fb_device *fbdev = platform_get_drvdata(dev);
 637
 638        if (!fbdev)
 639                return 0;
 640
 641        memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
 642
 643        /* Restart LCD clocking */
 644        au_writel(sys_clksrc, SYS_CLKSRC);
 645
 646        /* Unblank the LCD */
 647        au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);
 648
 649        return 0;
 650}
 651#else
 652#define au1100fb_drv_suspend NULL
 653#define au1100fb_drv_resume NULL
 654#endif
 655
 656static struct platform_driver au1100fb_driver = {
 657        .driver = {
 658                .name           = "au1100-lcd",
 659                .owner          = THIS_MODULE,
 660        },
 661        .probe          = au1100fb_drv_probe,
 662        .remove         = au1100fb_drv_remove,
 663        .suspend        = au1100fb_drv_suspend,
 664        .resume         = au1100fb_drv_resume,
 665};
 666
 667static int __init au1100fb_load(void)
 668{
 669        return platform_driver_register(&au1100fb_driver);
 670}
 671
 672static void __exit au1100fb_unload(void)
 673{
 674        platform_driver_unregister(&au1100fb_driver);
 675}
 676
 677module_init(au1100fb_load);
 678module_exit(au1100fb_unload);
 679
 680MODULE_DESCRIPTION(DRIVER_DESC);
 681MODULE_LICENSE("GPL");
 682
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