drivers/video/nuc900fb.c

   1 /*
   2  *
   3  * Copyright (c) 2009 Nuvoton technology corporation
   4  * All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  *  Description:
  12  *    Nuvoton LCD Controller Driver
  13  *  Author:
  14  *    Wang Qiang (rurality.linux@gmail.com) 2009/12/11
  15  */
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/errno.h>
  19 #include <linux/string.h>
  20 #include <linux/mm.h>
  21 #include <linux/tty.h>
  22 #include <linux/slab.h>
  23 #include <linux/delay.h>
  24 #include <linux/fb.h>
  25 #include <linux/init.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/workqueue.h>
  29 #include <linux/wait.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/clk.h>
  32 #include <linux/cpufreq.h>
  33 #include <linux/io.h>
  34 #include <linux/pm.h>
  35 #include <linux/device.h>
  36
  37 #include <mach/map.h>
  38 #include <mach/regs-clock.h>
  39 #include <mach/regs-ldm.h>
  40 #include <mach/fb.h>
  41 #include <mach/clkdev.h>
  42
  43 #include "nuc900fb.h"
  44
  45
  46 /*
  47  *  Initialize the nuc900 video (dual) buffer address
  48  */
  49 static void nuc900fb_set_lcdaddr(struct fb_info *info)
  50 {
  51         struct nuc900fb_info *fbi = info->par;
  52         void __iomem *regs = fbi->io;
  53         unsigned long vbaddr1, vbaddr2;
  54
  55         vbaddr1  = info->fix.smem_start;
  56         vbaddr2  = info->fix.smem_start;
  57         vbaddr2 += info->fix.line_length * info->var.yres;
  58
  59         /* set frambuffer start phy addr*/
  60         writel(vbaddr1, regs + REG_LCM_VA_BADDR0);
  61         writel(vbaddr2, regs + REG_LCM_VA_BADDR1);
  62
  63         writel(fbi->regs.lcd_va_fbctrl, regs + REG_LCM_VA_FBCTRL);
  64         writel(fbi->regs.lcd_va_scale, regs + REG_LCM_VA_SCALE);
  65 }
  66
  67 /*
  68  *      calculate divider for lcd div
  69  */
  70 static unsigned int nuc900fb_calc_pixclk(struct nuc900fb_info *fbi,
  71                                          unsigned long pixclk)
  72 {
  73         unsigned long clk = fbi->clk_rate;
  74         unsigned long long div;
  75
  76         /* pixclk is in picseconds. our clock is in Hz*/
  77         /* div = (clk * pixclk)/10^12 */
  78         div = (unsigned long long)clk * pixclk;
  79         div >>= 12;
  80         do_div(div, 625 * 625UL * 625);
  81
  82         dev_dbg(fbi->dev, "pixclk %ld, divisor is %lld\n", pixclk, div);
  83
  84         return div;
  85 }
  86
  87 /*
  88  *      Check the video params of 'var'.
  89  */
  90 static int nuc900fb_check_var(struct fb_var_screeninfo *var,
  91                                struct fb_info *info)
  92 {
  93         struct nuc900fb_info *fbi = info->par;
  94         struct nuc900fb_mach_info *mach_info = fbi->dev->platform_data;
  95         struct nuc900fb_display *display = NULL;
  96         struct nuc900fb_display *default_display = mach_info->displays +
  97                                                    mach_info->default_display;
  98         int i;
  99
 100         dev_dbg(fbi->dev, "check_var(var=%p, info=%p)\n", var, info);
 101
 102         /* validate x/y resolution */
 103         /* choose default mode if possible */
 104         if (var->xres == default_display->xres &&
 105             var->yres == default_display->yres &&
 106             var->bits_per_pixel == default_display->bpp)
 107                 display = default_display;
 108         else
 109                 for (i = 0; i < mach_info->num_displays; i++)
 110                         if (var->xres == mach_info->displays[i].xres &&
 111                             var->yres == mach_info->displays[i].yres &&
 112                             var->bits_per_pixel == mach_info->displays[i].bpp) {
 113                                 display = mach_info->displays + i;
 114                                 break;
 115                         }
 116
 117         if (display == NULL) {
 118                 printk(KERN_ERR "wrong resolution or depth %dx%d at %d bit per pixel\n",
 119                         var->xres, var->yres, var->bits_per_pixel);
 120                 return -EINVAL;
 121         }
 122
 123         /* it should be the same size as the display */
 124         var->xres_virtual       = display->xres;
 125         var->yres_virtual       = display->yres;
 126         var->height             = display->height;
 127         var->width              = display->width;
 128
 129         /* copy lcd settings */
 130         var->pixclock           = display->pixclock;
 131         var->left_margin        = display->left_margin;
 132         var->right_margin       = display->right_margin;
 133         var->upper_margin       = display->upper_margin;
 134         var->lower_margin       = display->lower_margin;
 135         var->vsync_len          = display->vsync_len;
 136         var->hsync_len          = display->hsync_len;
 137
 138         var->transp.offset      = 0;
 139         var->transp.length      = 0;
 140
 141         fbi->regs.lcd_dccs = display->dccs;
 142         fbi->regs.lcd_device_ctrl = display->devctl;
 143         fbi->regs.lcd_va_fbctrl = display->fbctrl;
 144         fbi->regs.lcd_va_scale = display->scale;
 145
 146         /* set R/G/B possions */
 147         switch (var->bits_per_pixel) {
 148         case 1:
 149         case 2:
 150         case 4:
 151         case 8:
 152         default:
 153                 var->red.offset         = 0;
 154                 var->red.length         = var->bits_per_pixel;
 155                 var->green              = var->red;
 156                 var->blue               = var->red;
 157                 break;
 158         case 12:
 159                 var->red.length         = 4;
 160                 var->green.length       = 4;
 161                 var->blue.length        = 4;
 162                 var->red.offset         = 8;
 163                 var->green.offset       = 4;
 164                 var->blue.offset        = 0;
 165                 break;
 166         case 16:
 167                 var->red.length         = 5;
 168                 var->green.length       = 6;
 169                 var->blue.length        = 5;
 170                 var->red.offset         = 11;
 171                 var->green.offset       = 5;
 172                 var->blue.offset        = 0;
 173                 break;
 174         case 18:
 175                 var->red.length         = 6;
 176                 var->green.length       = 6;
 177                 var->blue.length        = 6;
 178                 var->red.offset         = 12;
 179                 var->green.offset       = 6;
 180                 var->blue.offset        = 0;
 181                 break;
 182         case 32:
 183                 var->red.length         = 8;
 184                 var->green.length       = 8;
 185                 var->blue.length        = 8;
 186                 var->red.offset         = 16;
 187                 var->green.offset       = 8;
 188                 var->blue.offset        = 0;
 189                 break;
 190         }
 191
 192         return 0;
 193 }
 194
 195 /*
 196  *      Calculate lcd register values from var setting & save into hw
 197  */
 198 static void nuc900fb_calculate_lcd_regs(const struct fb_info *info,
 199                                         struct nuc900fb_hw *regs)
 200 {
 201         const struct fb_var_screeninfo *var = &info->var;
 202         int vtt = var->height + var->upper_margin + var->lower_margin;
 203         int htt = var->width + var->left_margin + var->right_margin;
 204         int hsync = var->width + var->right_margin;
 205         int vsync = var->height + var->lower_margin;
 206
 207         regs->lcd_crtc_size = LCM_CRTC_SIZE_VTTVAL(vtt) |
 208                               LCM_CRTC_SIZE_HTTVAL(htt);
 209         regs->lcd_crtc_dend = LCM_CRTC_DEND_VDENDVAL(var->height) |
 210                               LCM_CRTC_DEND_HDENDVAL(var->width);
 211         regs->lcd_crtc_hr = LCM_CRTC_HR_EVAL(var->width + 5) |
 212                             LCM_CRTC_HR_SVAL(var->width + 1);
 213         regs->lcd_crtc_hsync = LCM_CRTC_HSYNC_EVAL(hsync + var->hsync_len) |
 214                                LCM_CRTC_HSYNC_SVAL(hsync);
 215         regs->lcd_crtc_vr = LCM_CRTC_VR_EVAL(vsync + var->vsync_len) |
 216                             LCM_CRTC_VR_SVAL(vsync);
 217
 218 }
 219
 220 /*
 221  *      Activate (set) the controller from the given framebuffer
 222  *      information
 223  */
 224 static void nuc900fb_activate_var(struct fb_info *info)
 225 {
 226         struct nuc900fb_info *fbi = info->par;
 227         void __iomem *regs = fbi->io;
 228         struct fb_var_screeninfo *var = &info->var;
 229         int clkdiv;
 230
 231         clkdiv = nuc900fb_calc_pixclk(fbi, var->pixclock) - 1;
 232         if (clkdiv < 0)
 233                 clkdiv = 0;
 234
 235         nuc900fb_calculate_lcd_regs(info, &fbi->regs);
 236
 237         /* set the new lcd registers*/
 238
 239         dev_dbg(fbi->dev, "new lcd register set:\n");
 240         dev_dbg(fbi->dev, "dccs       = 0x%08x\n", fbi->regs.lcd_dccs);
 241         dev_dbg(fbi->dev, "dev_ctl    = 0x%08x\n", fbi->regs.lcd_device_ctrl);
 242         dev_dbg(fbi->dev, "crtc_size  = 0x%08x\n", fbi->regs.lcd_crtc_size);
 243         dev_dbg(fbi->dev, "crtc_dend  = 0x%08x\n", fbi->regs.lcd_crtc_dend);
 244         dev_dbg(fbi->dev, "crtc_hr    = 0x%08x\n", fbi->regs.lcd_crtc_hr);
 245         dev_dbg(fbi->dev, "crtc_hsync = 0x%08x\n", fbi->regs.lcd_crtc_hsync);
 246         dev_dbg(fbi->dev, "crtc_vr    = 0x%08x\n", fbi->regs.lcd_crtc_vr);
 247
 248         writel(fbi->regs.lcd_device_ctrl, regs + REG_LCM_DEV_CTRL);
 249         writel(fbi->regs.lcd_crtc_size, regs + REG_LCM_CRTC_SIZE);
 250         writel(fbi->regs.lcd_crtc_dend, regs + REG_LCM_CRTC_DEND);
 251         writel(fbi->regs.lcd_crtc_hr, regs + REG_LCM_CRTC_HR);
 252         writel(fbi->regs.lcd_crtc_hsync, regs + REG_LCM_CRTC_HSYNC);
 253         writel(fbi->regs.lcd_crtc_vr, regs + REG_LCM_CRTC_VR);
 254
 255         /* set lcd address pointers */
 256         nuc900fb_set_lcdaddr(info);
 257
 258         writel(fbi->regs.lcd_dccs, regs + REG_LCM_DCCS);
 259 }
 260
 261 /*
 262  *      Alters the hardware state.
 263  *
 264  */
 265 static int nuc900fb_set_par(struct fb_info *info)
 266 {
 267         struct fb_var_screeninfo *var = &info->var;
 268
 269         switch (var->bits_per_pixel) {
 270         case 32:
 271         case 24:
 272         case 18:
 273         case 16:
 274         case 12:
 275                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 276                 break;
 277         case 1:
 278                 info->fix.visual = FB_VISUAL_MONO01;
 279                 break;
 280         default:
 281                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 282                 break;
 283         }
 284
 285         info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
 286
 287         /* activate this new configuration */
 288         nuc900fb_activate_var(info);
 289         return 0;
 290 }
 291
 292 static inline unsigned int chan_to_field(unsigned int chan,
 293                                          struct fb_bitfield *bf)
 294 {
 295         chan &= 0xffff;
 296         chan >>= 16 - bf->length;
 297         return chan << bf->offset;
 298 }
 299
 300 static int nuc900fb_setcolreg(unsigned regno,
 301                                unsigned red, unsigned green, unsigned blue,
 302                                unsigned transp, struct fb_info *info)
 303 {
 304         unsigned int val;
 305
 306         switch (info->fix.visual) {
 307         case FB_VISUAL_TRUECOLOR:
 308                 /* true-colour, use pseuo-palette */
 309                 if (regno < 16) {
 310                         u32 *pal = info->pseudo_palette;
 311
 312                         val  = chan_to_field(red, &info->var.red);
 313                         val |= chan_to_field(green, &info->var.green);
 314                         val |= chan_to_field(blue, &info->var.blue);
 315                         pal[regno] = val;
 316                 }
 317                 break;
 318
 319         default:
 320                 return 1;   /* unknown type */
 321         }
 322         return 0;
 323 }
 324
 325 /**
 326  *      nuc900fb_blank
 327  *
 328  */
 329 static int nuc900fb_blank(int blank_mode, struct fb_info *info)
 330 {
 331
 332         return 0;
 333 }
 334
 335 static struct fb_ops nuc900fb_ops = {
 336         .owner                  = THIS_MODULE,
 337         .fb_check_var           = nuc900fb_check_var,
 338         .fb_set_par             = nuc900fb_set_par,
 339         .fb_blank               = nuc900fb_blank,
 340         .fb_setcolreg           = nuc900fb_setcolreg,
 341         .fb_fillrect            = cfb_fillrect,
 342         .fb_copyarea            = cfb_copyarea,
 343         .fb_imageblit           = cfb_imageblit,
 344 };
 345
 346
 347 static inline void modify_gpio(void __iomem *reg,
 348                                unsigned long set, unsigned long mask)
 349 {
 350         unsigned long tmp;
 351         tmp = readl(reg) & ~mask;
 352         writel(tmp | set, reg);
 353 }
 354
 355 /*
 356  * Initialise LCD-related registers
 357  */
 358 static int nuc900fb_init_registers(struct fb_info *info)
 359 {
 360         struct nuc900fb_info *fbi = info->par;
 361         struct nuc900fb_mach_info *mach_info = fbi->dev->platform_data;
 362         void __iomem *regs = fbi->io;
 363
 364         /*reset the display engine*/
 365         writel(0, regs + REG_LCM_DCCS);
 366         writel(readl(regs + REG_LCM_DCCS) | LCM_DCCS_ENG_RST,
 367                regs + REG_LCM_DCCS);
 368         ndelay(100);
 369         writel(readl(regs + REG_LCM_DCCS) & (~LCM_DCCS_ENG_RST),
 370                regs + REG_LCM_DCCS);
 371         ndelay(100);
 372
 373         writel(0, regs + REG_LCM_DEV_CTRL);
 374
 375         /* config gpio output */
 376         modify_gpio(W90X900_VA_GPIO + 0x54, mach_info->gpio_dir,
 377                     mach_info->gpio_dir_mask);
 378         modify_gpio(W90X900_VA_GPIO + 0x58, mach_info->gpio_data,
 379                     mach_info->gpio_data_mask);
 380
 381         return 0;
 382 }
 383
 384
 385 /*
 386  *    Alloc the SDRAM region of NUC900 for the frame buffer.
 387  *    The buffer should be a non-cached, non-buffered, memory region
 388  *    to allow palette and pixel writes without flushing the cache.
 389  */
 390 static int __init nuc900fb_map_video_memory(struct fb_info *info)
 391 {
 392         struct nuc900fb_info *fbi = info->par;
 393         dma_addr_t map_dma;
 394         unsigned long map_size = PAGE_ALIGN(info->fix.smem_len);
 395
 396         dev_dbg(fbi->dev, "nuc900fb_map_video_memory(fbi=%p) map_size %lu\n",
 397                 fbi, map_size);
 398
 399         info->screen_base = dma_alloc_writecombine(fbi->dev, map_size,
 400                                                         &map_dma, GFP_KERNEL);
 401
 402         if (!info->screen_base)
 403                 return -ENOMEM;
 404
 405         memset(info->screen_base, 0x00, map_size);
 406         info->fix.smem_start = map_dma;
 407
 408         return 0;
 409 }
 410
 411 static inline void nuc900fb_unmap_video_memory(struct fb_info *info)
 412 {
 413         struct nuc900fb_info *fbi = info->par;
 414         dma_free_writecombine(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
 415                               info->screen_base, info->fix.smem_start);
 416 }
 417
 418 static irqreturn_t nuc900fb_irqhandler(int irq, void *dev_id)
 419 {
 420         struct nuc900fb_info *fbi = dev_id;
 421         void __iomem *regs = fbi->io;
 422         void __iomem *irq_base = fbi->irq_base;
 423         unsigned long lcdirq = readl(regs + REG_LCM_INT_CS);
 424
 425         if (lcdirq & LCM_INT_CS_DISP_F_STATUS) {
 426                 writel(readl(irq_base) | 1<<30, irq_base);
 427
 428                 /* wait VA_EN low */
 429                 if ((readl(regs + REG_LCM_DCCS) &
 430                     LCM_DCCS_SINGLE) == LCM_DCCS_SINGLE)
 431                         while ((readl(regs + REG_LCM_DCCS) &
 432                                LCM_DCCS_VA_EN) == LCM_DCCS_VA_EN)
 433                                 ;
 434                 /* display_out-enable */
 435                 writel(readl(regs + REG_LCM_DCCS) | LCM_DCCS_DISP_OUT_EN,
 436                         regs + REG_LCM_DCCS);
 437                 /* va-enable*/
 438                 writel(readl(regs + REG_LCM_DCCS) | LCM_DCCS_VA_EN,
 439                         regs + REG_LCM_DCCS);
 440         } else if (lcdirq & LCM_INT_CS_UNDERRUN_INT) {
 441                 writel(readl(irq_base) | LCM_INT_CS_UNDERRUN_INT, irq_base);
 442         } else if (lcdirq & LCM_INT_CS_BUS_ERROR_INT) {
 443                 writel(readl(irq_base) | LCM_INT_CS_BUS_ERROR_INT, irq_base);
 444         }
 445
 446         return IRQ_HANDLED;
 447 }
 448
 449 #ifdef CONFIG_CPU_FREQ
 450
 451 static int nuc900fb_cpufreq_transition(struct notifier_block *nb,
 452                                        unsigned long val, void *data)
 453 {
 454         struct nuc900fb_info *info;
 455         struct fb_info *fbinfo;
 456         long delta_f;
 457         info = container_of(nb, struct nuc900fb_info, freq_transition);
 458         fbinfo = platform_get_drvdata(to_platform_device(info->dev));
 459
 460         delta_f = info->clk_rate - clk_get_rate(info->clk);
 461
 462         if ((val == CPUFREQ_POSTCHANGE && delta_f > 0) ||
 463            (val == CPUFREQ_PRECHANGE && delta_f < 0)) {
 464                 info->clk_rate = clk_get_rate(info->clk);
 465                 nuc900fb_activate_var(fbinfo);
 466         }
 467
 468         return 0;
 469 }
 470
 471 static inline int nuc900fb_cpufreq_register(struct nuc900fb_info *fbi)
 472 {
 473         fbi->freq_transition.notifier_call = nuc900fb_cpufreq_transition;
 474         return cpufreq_register_notifier(&fbi->freq_transition,
 475                                   CPUFREQ_TRANSITION_NOTIFIER);
 476 }
 477
 478 static inline void nuc900fb_cpufreq_deregister(struct nuc900fb_info *fbi)
 479 {
 480         cpufreq_unregister_notifier(&fbi->freq_transition,
 481                                     CPUFREQ_TRANSITION_NOTIFIER);
 482 }
 483 #else
 484 static inline int nuc900fb_cpufreq_transition(struct notifier_block *nb,
 485                                        unsigned long val, void *data)
 486 {
 487         return 0;
 488 }
 489
 490 static inline int nuc900fb_cpufreq_register(struct nuc900fb_info *fbi)
 491 {
 492         return 0;
 493 }
 494
 495 static inline void nuc900fb_cpufreq_deregister(struct nuc900fb_info *info)
 496 {
 497 }
 498 #endif
 499
 500 static char driver_name[] = "nuc900fb";
 501
 502 static int __devinit nuc900fb_probe(struct platform_device *pdev)
 503 {
 504         struct nuc900fb_info *fbi;
 505         struct nuc900fb_display *display;
 506         struct fb_info     *fbinfo;
 507         struct nuc900fb_mach_info *mach_info;
 508         struct resource *res;
 509         int ret;
 510         int irq;
 511         int i;
 512         int size;
 513
 514         dev_dbg(&pdev->dev, "devinit\n");
 515         mach_info = pdev->dev.platform_data;
 516         if (mach_info == NULL) {
 517                 dev_err(&pdev->dev,
 518                         "no platform data for lcd, cannot attach\n");
 519                 return -EINVAL;
 520         }
 521
 522         if (mach_info->default_display > mach_info->num_displays) {
 523                 dev_err(&pdev->dev,
 524                         "default display No. is %d but only %d displays \n",
 525                         mach_info->default_display, mach_info->num_displays);
 526                 return -EINVAL;
 527         }
 528
 529
 530         display = mach_info->displays + mach_info->default_display;
 531
 532         irq = platform_get_irq(pdev, 0);
 533         if (irq < 0) {
 534                 dev_err(&pdev->dev, "no irq for device\n");
 535                 return -ENOENT;
 536         }
 537
 538         fbinfo = framebuffer_alloc(sizeof(struct nuc900fb_info), &pdev->dev);
 539         if (!fbinfo)
 540                 return -ENOMEM;
 541
 542         platform_set_drvdata(pdev, fbinfo);
 543
 544         fbi = fbinfo->par;
 545         fbi->dev = &pdev->dev;
 546
 547 #ifdef CONFIG_CPU_NUC950
 548         fbi->drv_type = LCDDRV_NUC950;
 549 #endif
 550
 551         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 552
 553         size = (res->end - res->start) + 1;
 554         fbi->mem = request_mem_region(res->start, size, pdev->name);
 555         if (fbi->mem == NULL) {
 556                 dev_err(&pdev->dev, "failed to alloc memory region\n");
 557                 ret = -ENOENT;
 558                 goto free_fb;
 559         }
 560
 561         fbi->io = ioremap(res->start, size);
 562         if (fbi->io == NULL) {
 563                 dev_err(&pdev->dev, "ioremap() of lcd registers failed\n");
 564                 ret = -ENXIO;
 565                 goto release_mem_region;
 566         }
 567
 568         fbi->irq_base = fbi->io + REG_LCM_INT_CS;
 569
 570
 571         /* Stop the LCD */
 572         writel(0, fbi->io + REG_LCM_DCCS);
 573
 574         /* fill the fbinfo*/
 575         strcpy(fbinfo->fix.id, driver_name);
 576         fbinfo->fix.type                = FB_TYPE_PACKED_PIXELS;
 577         fbinfo->fix.type_aux            = 0;
 578         fbinfo->fix.xpanstep            = 0;
 579         fbinfo->fix.ypanstep            = 0;
 580         fbinfo->fix.ywrapstep           = 0;
 581         fbinfo->fix.accel               = FB_ACCEL_NONE;
 582         fbinfo->var.nonstd              = 0;
 583         fbinfo->var.activate            = FB_ACTIVATE_NOW;
 584         fbinfo->var.accel_flags         = 0;
 585         fbinfo->var.vmode               = FB_VMODE_NONINTERLACED;
 586         fbinfo->fbops                   = &nuc900fb_ops;
 587         fbinfo->flags                   = FBINFO_FLAG_DEFAULT;
 588         fbinfo->pseudo_palette          = &fbi->pseudo_pal;
 589
 590         ret = request_irq(irq, nuc900fb_irqhandler, IRQF_DISABLED,
 591                           pdev->name, fbinfo);
 592         if (ret) {
 593                 dev_err(&pdev->dev, "cannot register irq handler %d -err %d\n",
 594                         irq, ret);
 595                 ret = -EBUSY;
 596                 goto release_regs;
 597         }
 598
 599         nuc900_driver_clksrc_div(&pdev->dev, "ext", 0x2);
 600
 601         fbi->clk = clk_get(&pdev->dev, NULL);
 602         if (!fbi->clk || IS_ERR(fbi->clk)) {
 603                 printk(KERN_ERR "nuc900-lcd:failed to get lcd clock source\n");
 604                 ret = -ENOENT;
 605                 goto release_irq;
 606         }
 607
 608         clk_enable(fbi->clk);
 609         dev_dbg(&pdev->dev, "got and enabled clock\n");
 610
 611         fbi->clk_rate = clk_get_rate(fbi->clk);
 612
 613         /* calutate the video buffer size */
 614         for (i = 0; i < mach_info->num_displays; i++) {
 615                 unsigned long smem_len = mach_info->displays[i].xres;
 616                 smem_len *= mach_info->displays[i].yres;
 617                 smem_len *= mach_info->displays[i].bpp;
 618                 smem_len >>= 3;
 619                 if (fbinfo->fix.smem_len < smem_len)
 620                         fbinfo->fix.smem_len = smem_len;
 621         }
 622
 623         /* Initialize Video Memory */
 624         ret = nuc900fb_map_video_memory(fbinfo);
 625         if (ret) {
 626                 printk(KERN_ERR "Failed to allocate video RAM: %x\n", ret);
 627                 goto release_clock;
 628         }
 629
 630         dev_dbg(&pdev->dev, "got video memory\n");
 631
 632         fbinfo->var.xres = display->xres;
 633         fbinfo->var.yres = display->yres;
 634         fbinfo->var.bits_per_pixel = display->bpp;
 635
 636         nuc900fb_init_registers(fbinfo);
 637
 638         nuc900fb_check_var(&fbinfo->var, fbinfo);
 639
 640         ret = nuc900fb_cpufreq_register(fbi);
 641         if (ret < 0) {
 642                 dev_err(&pdev->dev, "Failed to register cpufreq\n");
 643                 goto free_video_memory;
 644         }
 645
 646         ret = register_framebuffer(fbinfo);
 647         if (ret) {
 648                 printk(KERN_ERR "failed to register framebuffer device: %d\n",
 649                         ret);
 650                 goto free_cpufreq;
 651         }
 652
 653         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 654                 fbinfo->node, fbinfo->fix.id);
 655
 656         return 0;
 657
 658 free_cpufreq:
 659         nuc900fb_cpufreq_deregister(fbi);
 660 free_video_memory:
 661         nuc900fb_unmap_video_memory(fbinfo);
 662 release_clock:
 663         clk_disable(fbi->clk);
 664         clk_put(fbi->clk);
 665 release_irq:
 666         free_irq(irq, fbi);
 667 release_regs:
 668         iounmap(fbi->io);
 669 release_mem_region:
 670         release_mem_region(res->start, size);
 671 free_fb:
 672         framebuffer_release(fbinfo);
 673         return ret;
 674 }
 675
 676 /*
 677  * shutdown the lcd controller
 678  */
 679 static void nuc900fb_stop_lcd(struct fb_info *info)
 680 {
 681         struct nuc900fb_info *fbi = info->par;
 682         void __iomem *regs = fbi->io;
 683
 684         writel((~LCM_DCCS_DISP_INT_EN) | (~LCM_DCCS_VA_EN) | (~LCM_DCCS_OSD_EN),
 685                 regs + REG_LCM_DCCS);
 686 }
 687
 688 /*
 689  *  Cleanup
 690  */
 691 static int nuc900fb_remove(struct platform_device *pdev)
 692 {
 693         struct fb_info *fbinfo = platform_get_drvdata(pdev);
 694         struct nuc900fb_info *fbi = fbinfo->par;
 695         int irq;
 696
 697         nuc900fb_stop_lcd(fbinfo);
 698         msleep(1);
 699
 700         nuc900fb_unmap_video_memory(fbinfo);
 701
 702         iounmap(fbi->io);
 703
 704         irq = platform_get_irq(pdev, 0);
 705         free_irq(irq, fbi);
 706
 707         release_resource(fbi->mem);
 708         kfree(fbi->mem);
 709
 710         platform_set_drvdata(pdev, NULL);
 711         framebuffer_release(fbinfo);
 712
 713         return 0;
 714 }
 715
 716 #ifdef CONFIG_PM
 717
 718 /*
 719  *      suspend and resume support for the lcd controller
 720  */
 721
 722 static int nuc900fb_suspend(struct platform_device *dev, pm_message_t state)
 723 {
 724         struct fb_info     *fbinfo = platform_get_drvdata(dev);
 725         struct nuc900fb_info *info = fbinfo->par;
 726
 727         nuc900fb_stop_lcd();
 728         msleep(1);
 729         clk_disable(info->clk);
 730         return 0;
 731 }
 732
 733 static int nuc900fb_resume(struct platform_device *dev)
 734 {
 735         struct fb_info     *fbinfo = platform_get_drvdata(dev);
 736         struct nuc900fb_info *fbi = fbinfo->par;
 737
 738         printk(KERN_INFO "nuc900fb resume\n");
 739
 740         clk_enable(fbi->clk);
 741         msleep(1);
 742
 743         nuc900fb_init_registers(fbinfo);
 744         nuc900fb_activate_var(bfinfo);
 745
 746         return 0;
 747 }
 748
 749 #else
 750 #define nuc900fb_suspend NULL
 751 #define nuc900fb_resume  NULL
 752 #endif
 753
 754 static struct platform_driver nuc900fb_driver = {
 755         .probe          = nuc900fb_probe,
 756         .remove         = nuc900fb_remove,
 757         .suspend        = nuc900fb_suspend,
 758         .resume         = nuc900fb_resume,
 759         .driver         = {
 760                 .name   = "nuc900-lcd",
 761                 .owner  = THIS_MODULE,
 762         },
 763 };
 764
 765 int __devinit nuc900fb_init(void)
 766 {
 767         return platform_driver_register(&nuc900fb_driver);
 768 }
 769
 770 static void __exit nuc900fb_cleanup(void)
 771 {
 772         platform_driver_unregister(&nuc900fb_driver);
 773 }
 774
 775 module_init(nuc900fb_init);
 776 module_exit(nuc900fb_cleanup);
 777
 778 MODULE_DESCRIPTION("Framebuffer driver for the NUC900");
 779 MODULE_LICENSE("GPL");