android2.3 显示驱动学习分析

/* linux/drivers/video/samsung/s3cfb.c
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
 *              http://www.samsung.com/
 *
 * Core file for Samsung Display Controller (FIMD) driver
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include
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#include
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#include
#ifdef CONFIG_HAS_WAKELOCK
#include
#include
#include
#endif
#include "s3cfb.h"

struct s3c_platform_fb *to_fb_plat(struct device *dev)
{
 struct platform_device *pdev = to_platform_device(dev);

 return (struct s3c_platform_fb *)pdev->dev.platform_data;
}

static unsigned int bootloaderfb;
module_param_named(bootloaderfb, bootloaderfb, uint, 0444);
MODULE_PARM_DESC(bootloaderfb, "Address of booting logo image in Bootloader");

#ifndef CONFIG_FRAMEBUFFER_CONSOLE
static int s3cfb_draw_logo(struct fb_info *fb)
{
#ifdef CONFIG_FB_S3C_SPLASH_SCREEN
 struct fb_fix_screeninfo *fix = &fb->fix;
 struct fb_var_screeninfo *var = &fb->var;

 u32 height = var->yres / 3;
 u32 line = fix->line_length;
 u32 i, j;

 for (i = 0; i < height; i++) {
  int offset = i * line;
  for (j = 0; j < var->xres; j++) {
   fb->screen_base[offset++] = 0;
   fb->screen_base[offset++] = 0;
   fb->screen_base[offset++] = 0xff;
   fb->screen_base[offset++] = 0;
  }
 }

 for (i = height; i < height * 2; i++) {
  int offset = i * line;
  for (j = 0; j < var->xres; j++) {
   fb->screen_base[offset++] = 0;
   fb->screen_base[offset++] = 0xff;
   fb->screen_base[offset++] = 0;
   fb->screen_base[offset++] = 0;
  }
 }

 for (i = height * 2; i < height * 3; i++) {
  int offset = i * line;
  for (j = 0; j < var->xres; j++) {
   fb->screen_base[offset++] = 0xff;
   fb->screen_base[offset++] = 0;
   fb->screen_base[offset++] = 0;
   fb->screen_base[offset++] = 0;
  }
 }
#endif
 if (bootloaderfb) {
  u8 *logo_virt_buf;
  logo_virt_buf = ioremap_nocache(bootloaderfb,
    fb->var.yres * fb->fix.line_length);

  memcpy(fb->screen_base, logo_virt_buf,
    fb->var.yres * fb->fix.line_length);
  iounmap(logo_virt_buf);
 }
 return 0;
}
#endif
static irqreturn_t s3cfb_irq_frame(int irq, void *data)
{
 struct s3cfb_global *fbdev = (struct s3cfb_global *)data;

 s3cfb_clear_interrupt(fbdev);

 complete_all(&fbdev->fb_complete);

 return IRQ_HANDLED;
}
static void s3cfb_set_window(struct s3cfb_global *ctrl, int id, int enable)
{
 struct s3cfb_window *win = ctrl->fb[id]->par;

 if (enable) {
  s3cfb_window_on(ctrl, id);
  win->enabled = 1;
 } else {
  s3cfb_window_off(ctrl, id);
  win->enabled = 0;
 }
}
static int s3cfb_init_global(struct s3cfb_global *ctrl)
{
 ctrl->output = OUTPUT_RGB;
 ctrl->rgb_mode = MODE_RGB_P;

 init_completion(&ctrl->fb_complete);
 mutex_init(&ctrl->lock);

 s3cfb_set_output(ctrl);
 s3cfb_set_display_mode(ctrl);
 s3cfb_set_polarity(ctrl);
 s3cfb_set_timing(ctrl);
 s3cfb_set_lcd_size(ctrl);

 return 0;
}
static int s3cfb_map_video_memory(struct fb_info *fb)
{
 struct fb_fix_screeninfo *fix = &fb->fix;
 struct s3cfb_window *win = fb->par;
 struct s3cfb_global *fbdev =
  platform_get_drvdata(to_platform_device(fb->device));
 struct s3c_platform_fb *pdata = to_fb_plat(fbdev->dev);

 if (win->owner == DMA_MEM_OTHER) {
  fix->smem_start = win->other_mem_addr;
  fix->smem_len = win->other_mem_size;
  return 0;
 }

 if (fb->screen_base)
  return 0;

 if (pdata && pdata->pmem_start && (pdata->pmem_size >= fix->smem_len)) {
  fix->smem_start = pdata->pmem_start;
  fb->screen_base = ioremap_wc(fix->smem_start, pdata->pmem_size);
 } else
  fb->screen_base = dma_alloc_writecombine(fbdev->dev,
       PAGE_ALIGN(fix->smem_len),
       (unsigned int *)
       &fix->smem_start, GFP_KERNEL);

 if (!fb->screen_base)
  return -ENOMEM;

 dev_info(fbdev->dev, "[fb%d] dma: 0x%08x, cpu: 0x%08x, "
    "size: 0x%08x\n", win->id,
    (unsigned int)fix->smem_start,
    (unsigned int)fb->screen_base, fix->smem_len);

 memset(fb->screen_base, 0, fix->smem_len);
 win->owner = DMA_MEM_FIMD;

 return 0;
}

static int s3cfb_unmap_video_memory(struct fb_info *fb)
{
 struct s3cfb_global *fbdev =
  platform_get_drvdata(to_platform_device(fb->device));
 struct s3c_platform_fb *pdata = to_fb_plat(fbdev->dev);
 struct fb_fix_screeninfo *fix = &fb->fix;
 struct s3cfb_window *win = fb->par;

 if (fix->smem_start) {
  if (win->owner == DMA_MEM_FIMD) {
   if (pdata && pdata->pmem_start &&
    (pdata->pmem_size >= fix->smem_len)) {
    iounmap(fb->screen_base);
    fb->screen_base = NULL;
   } else {
    dma_free_writecombine(fbdev->dev, fix->smem_len,
     fb->screen_base, fix->smem_start);
    fb->screen_base = NULL;
   }
  }
  fix->smem_start = 0;
  fix->smem_len = 0;
  dev_info(fbdev->dev,
   "[fb%d] video memory released\n", win->id);
 }

 return 0;
}
static int s3cfb_unmap_default_video_memory(struct fb_info *fb)
{
 struct s3cfb_global *fbdev =
  platform_get_drvdata(to_platform_device(fb->device));
 struct fb_fix_screeninfo *fix = &fb->fix;
 struct s3cfb_window *win = fb->par;

 if (fix->smem_start) {
#if defined(CONFIG_FB_S3C_VIRTUAL)
  iounmap(fb->screen_base);
  fb->screen_base = NULL;
#else
  dma_free_writecombine(fbdev->dev, fix->smem_len,
          fb->screen_base, fix->smem_start);
  fb->screen_base = NULL;
#endif
  fix->smem_start = 0;
  fix->smem_len = 0;
  dev_info(fbdev->dev,
   "[fb%d] video memory released\n", win->id);
 }

 return 0;
}

static void s3cfb_set_bitfield(struct fb_var_screeninfo *var)
{
 switch (var->bits_per_pixel) {
 case 16:
  if (var->transp.length == 1) {
   var->red.offset = 10;
   var->red.length = 5;
   var->green.offset = 5;
   var->green.length = 5;
   var->blue.offset = 0;
   var->blue.length = 5;
   var->transp.offset = 15;
  } else if (var->transp.length == 4) {
   var->red.offset = 8;
   var->red.length = 4;
   var->green.offset = 4;
   var->green.length = 4;
   var->blue.offset = 0;
   var->blue.length = 4;
   var->transp.offset = 12;
  } else {
   var->red.offset = 11;
   var->red.length = 5;
   var->green.offset = 5;
   var->green.length = 6;
   var->blue.offset = 0;
   var->blue.length = 5;
   var->transp.offset = 0;
  }
  break;

 case 24:
  var->red.offset = 16;
  var->red.length = 8;
  var->green.offset = 8;
  var->green.length = 8;
  var->blue.offset = 0;
  var->blue.length = 8;
  var->transp.offset = 0;
  var->transp.length = 0;
  break;

 case 32:
  var->red.offset = 16;
  var->red.length = 8;
  var->green.offset = 8;
  var->green.length = 8;
  var->blue.offset = 0;
  var->blue.length = 8;
  var->transp.offset = 24;
  var->transp.length = 8;

  break;
 }
}

static void s3cfb_set_alpha_info(struct fb_var_screeninfo *var,
    struct s3cfb_window *win)
{
 if (var->transp.length > 0)
  win->alpha.mode = PIXEL_BLENDING;
 else {
  win->alpha.mode = PLANE_BLENDING;
  win->alpha.channel = 0;
  win->alpha.value = S3CFB_AVALUE(0xf, 0xf, 0xf);
 }
}
static int s3cfb_check_var(struct fb_var_screeninfo *var, struct fb_info *fb)
{
 struct s3cfb_window *win = fb->par;
 struct s3cfb_global *fbdev =
  platform_get_drvdata(to_platform_device(fb->device));
 struct s3cfb_lcd *lcd = fbdev->lcd;

 dev_dbg(fbdev->dev, "[fb%d] check_var\n", win->id);

 if (var->bits_per_pixel != 16 && var->bits_per_pixel != 24 &&
     var->bits_per_pixel != 32) {
  dev_err(fbdev->dev, "invalid bits per pixel\n");
  return -EINVAL;
 }

 if (var->xres > lcd->width)
  var->xres = lcd->width;

 if (var->yres > lcd->height)
  var->yres = lcd->height;

 if (var->xres_virtual < var->xres)
  var->xres_virtual = var->xres;

 if (var->yres_virtual > var->yres * CONFIG_FB_S3C_NR_BUFFERS)
  var->yres_virtual = var->yres * CONFIG_FB_S3C_NR_BUFFERS;

 var->xoffset = 0;

 if (var->yoffset + var->yres > var->yres_virtual)
  var->yoffset = var->yres_virtual - var->yres;

 if (win->x + var->xres > lcd->width)
  win->x = lcd->width - var->xres;

 if (win->y + var->yres > lcd->height)
  win->y = lcd->height - var->yres;

 s3cfb_set_bitfield(var);
 s3cfb_set_alpha_info(var, win);

 return 0;
}

static void s3cfb_set_win_params(struct s3cfb_global *ctrl, int id)
{
 s3cfb_set_window_control(ctrl, id);
 s3cfb_set_window_position(ctrl, id);
 s3cfb_set_window_size(ctrl, id);
 s3cfb_set_buffer_address(ctrl, id);
 s3cfb_set_buffer_size(ctrl, id);

 if (id > 0) {
  s3cfb_set_alpha_blending(ctrl, id);
  s3cfb_set_chroma_key(ctrl, id);
 }
}
static int s3cfb_set_par(struct fb_info *fb)
{
 struct s3cfb_global *fbdev =
  platform_get_drvdata(to_platform_device(fb->device));
 struct s3c_platform_fb *pdata = to_fb_plat(fbdev->dev);
 struct s3cfb_window *win = fb->par;

 dev_dbg(fbdev->dev, "[fb%d] set_par\n", win->id);

 /* modify the fix info */
 if (win->id != pdata->default_win) {
  fb->fix.line_length = fb->var.xres_virtual *
      fb->var.bits_per_pixel / 8;
  fb->fix.smem_len = fb->fix.line_length * fb->var.yres_virtual;

  s3cfb_map_video_memory(fb);
 }

 s3cfb_set_win_params(fbdev, win->id);

 return 0;
}

static int s3cfb_blank(int blank_mode, struct fb_info *fb)
{
 struct s3cfb_window *win = fb->par;
 struct s3cfb_global *fbdev =
  platform_get_drvdata(to_platform_device(fb->device));

 dev_dbg(fbdev->dev, "change blank mode\n");

 switch (blank_mode) {
 case FB_BLANK_UNBLANK:
  if (fb->fix.smem_start) {
   s3cfb_win_map_off(fbdev, win->id);
   s3cfb_set_window(fbdev, win->id, 1);
  } else
   dev_info(fbdev->dev,
     "[fb%d] no allocated memory for unblank\n",
     win->id);
  break;

 case FB_BLANK_NORMAL:
  s3cfb_win_map_on(fbdev, win->id, 0);
  s3cfb_set_window(fbdev, win->id, 1);

  break;

 case FB_BLANK_POWERDOWN:
  s3cfb_set_window(fbdev, win->id, 0);
  s3cfb_win_map_off(fbdev, win->id);

  break;

 case FB_BLANK_VSYNC_SUSPEND:
 case FB_BLANK_HSYNC_SUSPEND:
 default:
  dev_dbg(fbdev->dev, "unsupported blank mode\n");
  return -EINVAL;
 }

 return 0;
}
static int s3cfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fb)
{
 struct fb_fix_screeninfo *fix = &fb->fix;
 struct s3cfb_window *win = fb->par;
 struct s3cfb_global *fbdev =
  platform_get_drvdata(to_platform_device(fb->device));

 if (var->yoffset + var->yres > var->yres_virtual) {
  dev_err(fbdev->dev, "invalid yoffset value\n");
  return -EINVAL;
 }

 if (win->owner == DMA_MEM_OTHER)
  fix->smem_start = win->other_mem_addr;

 fb->var.yoffset = var->yoffset;

 dev_dbg(fbdev->dev,
  "[fb%d] yoffset for pan display: %d\n",
  win->id, var->yoffset);

 s3cfb_set_buffer_address(fbdev, win->id);

 return 0;
}

static unsigned int __chan_to_field(unsigned int chan,
        struct fb_bitfield bf)
{
 chan &= 0xffff;
 chan >>= 16 - bf.length;

 return chan << bf.offset;
}

static int s3cfb_setcolreg(unsigned int regno, unsigned int red,
      unsigned int green, unsigned int blue,
      unsigned int transp, struct fb_info *fb)
{
 unsigned int *pal = (unsigned int *)fb->pseudo_palette;
 unsigned int val = 0;

 if (regno < 16) {
  val |= __chan_to_field(red, fb->var.red);
  val |= __chan_to_field(green, fb->var.green);
  val |= __chan_to_field(blue, fb->var.blue);
  val |= __chan_to_field(transp, fb->var.transp);

  pal[regno] = val;
 }

 return 0;
}

static int s3cfb_open(struct fb_info *fb, int user)
{
 struct s3cfb_global *fbdev =
  platform_get_drvdata(to_platform_device(fb->device));
 struct s3c_platform_fb *pdata = to_fb_plat(fbdev->dev);
 struct s3cfb_window *win = fb->par;
 int ret = 0;

 mutex_lock(&fbdev->lock);

 if (win->in_use && win->id != pdata->default_win)
  ret = -EBUSY;
 else
  win->in_use++;

 mutex_unlock(&fbdev->lock);

 return ret;
}
static int s3cfb_release_window(struct fb_info *fb)
{
 struct s3cfb_global *fbdev =
  platform_get_drvdata(to_platform_device(fb->device));
 struct s3c_platform_fb *pdata = to_fb_plat(fbdev->dev);
 struct s3cfb_window *win = fb->par;

 if (win->id != pdata->default_win) {
  s3cfb_set_window(fbdev, win->id, 0);
  s3cfb_unmap_video_memory(fb);
  s3cfb_set_buffer_address(fbdev, win->id);
 }

 win->x = 0;
 win->y = 0;

 return 0;
}
static int s3cfb_release(struct fb_info *fb, int user)
{
 struct s3cfb_global *fbdev =
  platform_get_drvdata(to_platform_device(fb->device));
 struct s3cfb_window *win = fb->par;

 s3cfb_release_window(fb);

 mutex_lock(&fbdev->lock);

 if (!WARN_ON(!win->in_use))
  win->in_use--;

 mutex_unlock(&fbdev->lock);

 return 0;
}

static int s3cfb_wait_for_vsync(struct s3cfb_global *ctrl)
{
 int ret;

 dev_dbg(ctrl->dev, "waiting for VSYNC interrupt\n");

 ret = wait_for_completion_interruptible_timeout(
  &ctrl->fb_complete, msecs_to_jiffies(100));
 if (ret == 0)
  return -ETIMEDOUT;
 if (ret < 0)
  return ret;

 dev_dbg(ctrl->dev, "got a VSYNC interrupt\n");

 return ret;
}
static int s3cfb_ioctl(struct fb_info *fb, unsigned int cmd, unsigned long arg)
{
 struct s3cfb_global *fbdev =
  platform_get_drvdata(to_platform_device(fb->device));
 struct fb_var_screeninfo *var = &fb->var;
 struct s3cfb_window *win = fb->par;
 struct s3cfb_lcd *lcd = fbdev->lcd;
 struct fb_fix_screeninfo *fix = &fb->fix;
 struct s3cfb_next_info next_fb_info;

 volatile unsigned int * LCDControllerBase = NULL;
 int framebuffer_addr = 0;

 int ret = 0;

 union {
  struct s3cfb_user_window user_window;
  struct s3cfb_user_plane_alpha user_alpha;
  struct s3cfb_user_chroma user_chroma;
  int vsync;
 } p;

 switch (cmd) {
 case FBIO_WAITFORVSYNC:
  s3cfb_wait_for_vsync(fbdev);
  break;

 case S3CFB_WIN_POSITION:
  if (copy_from_user(&p.user_window,
       (struct s3cfb_user_window __user *)arg,
       sizeof(p.user_window)))
   ret = -EFAULT;
  else {
   if (p.user_window.x < 0)
    p.user_window.x = 0;

   if (p.user_window.y < 0)
    p.user_window.y = 0;

   if (p.user_window.x + var->xres > lcd->width)
    win->x = lcd->width - var->xres;
   else
    win->x = p.user_window.x;

   if (p.user_window.y + var->yres > lcd->height)
    win->y = lcd->height - var->yres;
   else
    win->y = p.user_window.y;

   s3cfb_set_window_position(fbdev, win->id);
  }
  break;

 case S3CFB_WIN_SET_PLANE_ALPHA:
  if (copy_from_user(&p.user_alpha,
       (struct s3cfb_user_plane_alpha __user *)arg,
       sizeof(p.user_alpha)))
   ret = -EFAULT;
  else {
   win->alpha.mode = PLANE_BLENDING;
   win->alpha.channel = p.user_alpha.channel;
   win->alpha.value =
       S3CFB_AVALUE(p.user_alpha.red,
      p.user_alpha.green, p.user_alpha.blue);

   s3cfb_set_alpha_blending(fbdev, win->id);
  }
  break;

 case S3CFB_WIN_SET_CHROMA:
  if (copy_from_user(&p.user_chroma,
       (struct s3cfb_user_chroma __user *)arg,
       sizeof(p.user_chroma)))
   ret = -EFAULT;
  else {
   win->chroma.enabled = p.user_chroma.enabled;
   win->chroma.key = S3CFB_CHROMA(p.user_chroma.red,
             p.user_chroma.green,
             p.user_chroma.blue);

   s3cfb_set_chroma_key(fbdev, win->id);
  }
  break;

 case S3CFB_SET_VSYNC_INT:
  if (get_user(p.vsync, (int __user *)arg))
   ret = -EFAULT;
  else {
   if (p.vsync)
    s3cfb_set_global_interrupt(fbdev, 1);

   s3cfb_set_vsync_interrupt(fbdev, p.vsync);
  }
  break;

 case S3CFB_GET_CURR_FB_INFO:
  next_fb_info.phy_start_addr = fix->smem_start;
  next_fb_info.xres = var->xres;
  next_fb_info.yres = var->yres;
  next_fb_info.xres_virtual = var->xres_virtual;
  next_fb_info.yres_virtual = var->yres_virtual;
  next_fb_info.xoffset = var->xoffset;
  next_fb_info.yoffset = var->yoffset;
  next_fb_info.lcd_offset_x = 0;
  next_fb_info.lcd_offset_y = 0;

  if (copy_to_user((void *)arg,
     (struct s3cfb_next_info *) &next_fb_info,
     sizeof(struct s3cfb_next_info)))
   return -EFAULT;
  break;

 /* get changing physical framebuffer address(because of double buffering) */
 case S3CFB_GET_LCD_ADDR:
  LCDControllerBase = (volatile unsigned int *)ioremap(0xf8000000,1024);
  framebuffer_addr = LCDControllerBase[0xa0/4 + (win->id)*2];
  iounmap(LCDControllerBase);

  dev_dbg(fbdev->dev, "framebuffer_addr: 0x%08x\n", framebuffer_addr);

  if (copy_to_user((void *)arg, &framebuffer_addr, sizeof(int)))
   return -EFAULT;

  break;
 }

 return ret;
}

struct fb_ops s3cfb_ops = {
 .owner = THIS_MODULE,
 .fb_fillrect = cfb_fillrect,
 .fb_copyarea = cfb_copyarea,
 .fb_imageblit = cfb_imageblit,
 .fb_check_var = s3cfb_check_var,
 .fb_set_par = s3cfb_set_par,
 .fb_blank = s3cfb_blank,
 .fb_pan_display = s3cfb_pan_display,
 .fb_setcolreg = s3cfb_setcolreg,
 .fb_ioctl = s3cfb_ioctl,
 .fb_open = s3cfb_open,
 .fb_release = s3cfb_release,
};

static void s3cfb_init_fbinfo(struct s3cfb_global *ctrl, int id)
{
 struct fb_info *fb = ctrl->fb[id];
 struct fb_fix_screeninfo *fix = &fb->fix;
 struct fb_var_screeninfo *var = &fb->var;
 struct s3cfb_window *win = fb->par;
 struct s3cfb_alpha *alpha = &win->alpha;
 struct s3cfb_lcd *lcd = ctrl->lcd;
 struct s3cfb_lcd_timing *timing = &lcd->timing;

 memset(win, 0, sizeof(*win));
 platform_set_drvdata(to_platform_device(ctrl->dev), ctrl);
 strcpy(fix->id, S3CFB_NAME);

 win->id = id;
 win->path = DATA_PATH_DMA;
 win->dma_burst = 16;
 alpha->mode = PLANE_BLENDING;

 fb->fbops = &s3cfb_ops;
 fb->flags = FBINFO_FLAG_DEFAULT;
 fb->pseudo_palette = &win->pseudo_pal;
#if (CONFIG_FB_S3C_NR_BUFFERS != 1)
 fix->xpanstep = 2;
 fix->ypanstep = 1;
#else
 fix->xpanstep = 0;
 fix->ypanstep = 0;
#endif
 fix->type = FB_TYPE_PACKED_PIXELS;
 fix->accel = FB_ACCEL_NONE;
 fix->visual = FB_VISUAL_TRUECOLOR;
 var->xres = lcd->width;
 var->yres = lcd->height;
#if defined(CONFIG_FB_S3C_VIRTUAL)
 var->xres_virtual = CONFIG_FB_S3C_X_VRES;
 var->yres_virtual = CONFIG_FB_S3C_Y_VRES * CONFIG_FB_S3C_NR_BUFFERS;
#else
 var->xres_virtual = var->xres;
 var->yres_virtual = var->yres * CONFIG_FB_S3C_NR_BUFFERS;
#endif
 var->bits_per_pixel = 32;
 var->xoffset = 0;
 var->yoffset = 0;
 var->width = lcd->p_width;
 var->height = lcd->p_height;
 var->transp.length = 0;

 fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;
 fix->smem_len = fix->line_length * var->yres_virtual;

 var->nonstd = 0;
 var->activate = FB_ACTIVATE_NOW;
 var->vmode = FB_VMODE_NONINTERLACED;
 var->hsync_len = timing->h_sw;
 var->vsync_len = timing->v_sw;
 var->left_margin = timing->h_fp;
 var->right_margin = timing->h_bp;
 var->upper_margin = timing->v_fp;
 var->lower_margin = timing->v_bp;

 var->pixclock = lcd->freq * (var->left_margin + var->right_margin +
    var->hsync_len + var->xres) *
    (var->upper_margin + var->lower_margin +
    var->vsync_len + var->yres);

#if defined(CONFIG_FB_S3C_LTE480WV)
 /* LTE480WV LCD Device tunning.
  * To avoid LTE480WV LCD flickering
  */
 var->pixclock *= 2;
#endif

 dev_dbg(ctrl->dev, "pixclock: %d\n", var->pixclock);

 s3cfb_set_bitfield(var);
 s3cfb_set_alpha_info(var, win);

}

static int s3cfb_alloc_framebuffer(struct s3cfb_global *ctrl)
{
 struct s3c_platform_fb *pdata = to_fb_plat(ctrl->dev);
 int ret, i;

 ctrl->fb = kmalloc(pdata->nr_wins *
   sizeof(*(ctrl->fb)), GFP_KERNEL);
 if (!ctrl->fb) {
  dev_err(ctrl->dev, "not enough memory\n");
  ret = -ENOMEM;
  goto err_alloc;
 }

 for (i = 0; i < pdata->nr_wins; i++) {
  ctrl->fb[i] = framebuffer_alloc(sizeof(*ctrl->fb),
       ctrl->dev);
  if (!ctrl->fb[i]) {
   dev_err(ctrl->dev, "not enough memory\n");
   ret = -ENOMEM;
   goto err_alloc_fb;
  }

  s3cfb_init_fbinfo(ctrl, i);

  if (i == pdata->default_win) {
   if (s3cfb_map_video_memory(ctrl->fb[i])) {
    dev_err(ctrl->dev,
     "failed to map video memory "
     "for default window (%d)\n", i);
    ret = -ENOMEM;
    goto err_map_video_mem;
   }
  }
 }

 return 0;

err_alloc_fb:
 while (--i >= 0) {
  if (i == pdata->default_win)
   s3cfb_unmap_default_video_memory(ctrl->fb[i]);

err_map_video_mem:
  framebuffer_release(ctrl->fb[i]);
 }
 kfree(ctrl->fb);

err_alloc:
 return ret;
}

static int s3cfb_register_framebuffer(struct s3cfb_global *ctrl)
{
 struct s3c_platform_fb *pdata = to_fb_plat(ctrl->dev);
 int ret, i, j;

 for (i = pdata->default_win;
  i < pdata->nr_wins + pdata->default_win; i++) {
   j = i % pdata->nr_wins;
   ret = register_framebuffer(ctrl->fb[j]);
   if (ret) {
    dev_err(ctrl->dev, "failed to register "
      "framebuffer device\n");
    ret = -EINVAL;
    goto err_register_fb;
   }
#ifndef CONFIG_FRAMEBUFFER_CONSOLE
   if (j == pdata->default_win) {
    s3cfb_check_var(&ctrl->fb[j]->var, ctrl->fb[j]);
    s3cfb_set_par(ctrl->fb[j]);
    s3cfb_draw_logo(ctrl->fb[j]);
   }
#endif
 }

 return 0;
err_register_fb:
 while (--i >= pdata->default_win) {
  j = i % pdata->nr_wins;
  unregister_framebuffer(ctrl->fb[j]);
 }
 return ret;
}
static int s3cfb_sysfs_show_win_power(struct device *dev,
          struct device_attribute *attr, char *buf)
{
 struct s3c_platform_fb *pdata = to_fb_plat(dev);
 struct platform_device *pdev = to_platform_device(dev);
 struct s3cfb_global *fbdev = platform_get_drvdata(pdev);
 struct s3cfb_window *win;
 char temp[16];
 int i;

 for (i = 0; i < pdata->nr_wins; i++) {
  win = fbdev->fb[i]->par;
  sprintf(temp, "[fb%d] %s\n", i, win->enabled ? "on" : "off");
  strcat(buf, temp);
 }

 return strlen(buf);
}

static int s3cfb_sysfs_store_win_power(struct device *dev,
           struct device_attribute *attr,
           const char *buf, size_t len)
{
 struct s3c_platform_fb *pdata = to_fb_plat(dev);
 struct platform_device *pdev = to_platform_device(dev);
 struct s3cfb_global *fbdev = platform_get_drvdata(pdev);
 int id, to;
 int ret = 0;

 ret = strict_strtoul(buf, 10, (unsigned long *)&id);
 if (ret < 0)
  return -EINVAL;

 to = (id % 10);
 if (to != 0 && to != 1)
  return -EINVAL;

 id = (id / 10);
 if (id < 0 || id >= pdata->nr_wins)
  return -EINVAL;

 s3cfb_set_window(fbdev, id, to);

 return len;
}

static DEVICE_ATTR(win_power, S_IRUGO | S_IWUSR,
     s3cfb_sysfs_show_win_power, s3cfb_sysfs_store_win_power);

static int __devinit s3cfb_probe(struct platform_device *pdev)
{
 struct s3c_platform_fb *pdata;
 struct s3cfb_global *fbdev;
 struct resource *res;
 int i, j, ret = 0;

 fbdev = kzalloc(sizeof(struct s3cfb_global), GFP_KERNEL);
 if (!fbdev) {
  dev_err(&pdev->dev, "failed to allocate for "
   "global fb structure\n");
  ret = -ENOMEM;
  goto err_global;
 }
 fbdev->dev = &pdev->dev;

 fbdev->regulator = regulator_get(&pdev->dev, "pd");
 if (!fbdev->regulator) {
  dev_err(fbdev->dev, "failed to get regulator\n");
  ret = -EINVAL;
  goto err_regulator;
 }
 ret = regulator_enable(fbdev->regulator);
 if (ret < 0) {
  dev_err(fbdev->dev, "failed to enable regulator\n");
  ret = -EINVAL;
  goto err_regulator;
 }
 pdata = to_fb_plat(&pdev->dev);
 if (!pdata) {
  dev_err(fbdev->dev, "failed to get platform data\n");
  ret = -EINVAL;
  goto err_pdata;
 }

 fbdev->lcd = (struct s3cfb_lcd *)pdata->lcd;

 if (pdata->cfg_gpio)
  pdata->cfg_gpio(pdev);

 if (pdata->clk_on)
  pdata->clk_on(pdev, &fbdev->clock);

 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 if (!res) {
  dev_err(fbdev->dev, "failed to get io memory region\n");
  ret = -EINVAL;
  goto err_io;
 }

 res = request_mem_region(res->start,
     res->end - res->start + 1, pdev->name);
 if (!res) {
  dev_err(fbdev->dev, "failed to request io memory region\n");
  ret = -EINVAL;
  goto err_io;
 }

 fbdev->regs = ioremap(res->start, res->end - res->start + 1);
 if (!fbdev->regs) {
  dev_err(fbdev->dev, "failed to remap io region\n");
  ret = -EINVAL;
  goto err_mem;
 }

 s3cfb_set_vsync_interrupt(fbdev, 1);
 s3cfb_set_global_interrupt(fbdev, 1);
 s3cfb_init_global(fbdev);

 if (s3cfb_alloc_framebuffer(fbdev)) {
  ret = -ENOMEM;
  goto err_alloc;
 }

 if (s3cfb_register_framebuffer(fbdev)) {
  ret = -EINVAL;
  goto err_register;
 }

 s3cfb_set_clock(fbdev);
 s3cfb_set_window(fbdev, pdata->default_win, 1);

 s3cfb_display_on(fbdev);

 fbdev->irq = platform_get_irq(pdev, 0);
 if (request_irq(fbdev->irq, s3cfb_irq_frame, IRQF_SHARED,
   pdev->name, fbdev)) {
  dev_err(fbdev->dev, "request_irq failed\n");
  ret = -EINVAL;
  goto err_irq;
 }

#ifdef CONFIG_FB_S3C_LCD_INIT
 if (pdata->backlight_on)
  pdata->backlight_on(pdev);

 if (!bootloaderfb && pdata->reset_lcd)
  pdata->reset_lcd(pdev);
#endif

#ifdef CONFIG_HAS_EARLYSUSPEND
 fbdev->early_suspend.suspend = s3cfb_early_suspend;
 fbdev->early_suspend.resume = s3cfb_late_resume;
 fbdev->early_suspend.level = EARLY_SUSPEND_LEVEL_DISABLE_FB;
 register_early_suspend(&fbdev->early_suspend);
#endif

 ret = device_create_file(&(pdev->dev), &dev_attr_win_power);
 if (ret < 0)
  dev_err(fbdev->dev, "failed to add sysfs entries\n");

 dev_info(fbdev->dev, "registered successfully\n");

#if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO)
 if (fb_prepare_logo( fbdev->fb[pdata->default_win], FB_ROTATE_UR)) {
  printk("Start display and show logo\n");
  /* Start display and show logo on boot */
  fb_set_cmap(&fbdev->fb[pdata->default_win]->cmap, fbdev->fb[pdata->default_win]);
  fb_show_logo(fbdev->fb[pdata->default_win], FB_ROTATE_UR);
 }
#endif

 return 0;

err_irq:
 s3cfb_display_off(fbdev);
 s3cfb_set_window(fbdev, pdata->default_win, 0);
 for (i = pdata->default_win;
   i < pdata->nr_wins + pdata->default_win; i++) {
  j = i % pdata->nr_wins;
  unregister_framebuffer(fbdev->fb[j]);
 }
err_register:
 for (i = 0; i < pdata->nr_wins; i++) {
  if (i == pdata->default_win)
   s3cfb_unmap_default_video_memory(fbdev->fb[i]);
  framebuffer_release(fbdev->fb[i]);
 }
 kfree(fbdev->fb);

err_alloc:
 iounmap(fbdev->regs);

err_mem:
 release_mem_region(res->start,
     res->end - res->start + 1);

err_io:
 pdata->clk_off(pdev, &fbdev->clock);

err_pdata:
 regulator_disable(fbdev->regulator);

err_regulator:
 kfree(fbdev);

err_global:
 return ret;
}

static int __devexit s3cfb_remove(struct platform_device *pdev)
{
 struct s3c_platform_fb *pdata = to_fb_plat(&pdev->dev);
 struct s3cfb_global *fbdev = platform_get_drvdata(pdev);
 struct s3cfb_window *win;
 struct resource *res;
 struct fb_info *fb;
 int i;

 device_remove_file(&(pdev->dev), &dev_attr_win_power);

#ifdef CONFIG_HAS_EARLYSUSPEND
 unregister_early_suspend(&fbdev->early_suspend);
#endif

 free_irq(fbdev->irq, fbdev);
 iounmap(fbdev->regs);

 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 if (res)
  release_mem_region(res->start,
   res->end - res->start + 1);

 pdata->clk_off(pdev, &fbdev->clock);

 for (i = 0; i < pdata->nr_wins; i++) {
  fb = fbdev->fb[i];

  if (fb) {
   win = fb->par;
   if (win->id == pdata->default_win)
    s3cfb_unmap_default_video_memory(fb);
   else
    s3cfb_unmap_video_memory(fb);

   s3cfb_set_buffer_address(fbdev, i);
   framebuffer_release(fb);
  }
 }

 regulator_disable(fbdev->regulator);

 kfree(fbdev->fb);
 kfree(fbdev);

 return 0;
}

void s3cfb_early_suspend(struct early_suspend *h)
{
 struct s3cfb_global *fbdev =
  container_of(h, struct s3cfb_global, early_suspend);
 struct s3c_platform_fb *pdata = to_fb_plat(fbdev->dev);
 struct platform_device *pdev = to_platform_device(fbdev->dev);

 pr_debug("s3cfb_early_suspend is called\n");

 /* backlight_onoff function is only used for backlight_off */
 if (pdata->backlight_onoff)
  pdata->backlight_onoff(pdev, false);

 s3cfb_display_off(fbdev);
 clk_disable(fbdev->clock);
#if defined(CONFIG_FB_S3C_TL2796)
 lcd_cfg_gpio_early_suspend();
#endif
 regulator_disable(fbdev->regulator);

 return ;
}

void s3cfb_late_resume(struct early_suspend *h)
{
 struct s3cfb_global *fbdev =
  container_of(h, struct s3cfb_global, early_suspend);
 struct s3c_platform_fb *pdata = to_fb_plat(fbdev->dev);
 struct platform_device *pdev = to_platform_device(fbdev->dev);
 struct fb_info *fb;
 struct s3cfb_window *win;
 int i, j, ret;

 pr_info("s3cfb_late_resume is called\n");

 ret = regulator_enable(fbdev->regulator);
 if (ret < 0)
  dev_err(fbdev->dev, "failed to enable regulator\n");

#if defined(CONFIG_FB_S3C_TL2796)
 lcd_cfg_gpio_late_resume();
#endif
 dev_dbg(fbdev->dev, "wake up from suspend\n");
 if (pdata->cfg_gpio)
  pdata->cfg_gpio(pdev);

 clk_enable(fbdev->clock);
 s3cfb_init_global(fbdev);
 s3cfb_set_clock(fbdev);

 s3cfb_display_on(fbdev);

 for (i = pdata->default_win;
  i < pdata->nr_wins + pdata->default_win; i++) {
   j = i % pdata->nr_wins;
   fb = fbdev->fb[j];
   win = fb->par;
   if ((win->path == DATA_PATH_DMA) && (win->enabled)) {
    s3cfb_set_par(fb);
    s3cfb_set_window(fbdev, win->id, 1);
   }
 }

 s3cfb_set_vsync_interrupt(fbdev, 1);
 s3cfb_set_global_interrupt(fbdev, 1);

 if (pdata->reset_lcd)
  pdata->reset_lcd(pdev);

 if (pdata->backlight_on)
  pdata->backlight_on(pdev);

 pr_info("s3cfb_late_resume is complete\n");
 return ;
}

static struct platform_driver s3cfb_driver = {
 .probe = s3cfb_probe,
 .remove = __devexit_p(s3cfb_remove),
 .driver = {
     .name = S3CFB_NAME,
     .owner = THIS_MODULE,
 },
};

static int __init s3cfb_register(void)
{
 platform_driver_register(&s3cfb_driver);

 return 0;
}
static void __exit s3cfb_unregister(void)
{
 platform_driver_unregister(&s3cfb_driver);
}

module_init(s3cfb_register);
module_exit(s3cfb_unregister);

MODULE_AUTHOR("Jonghun, Han ");
MODULE_AUTHOR("Jinsung, Yang ");
MODULE_DESCRIPTION("Samsung Display Controller (FIMD) driver");
MODULE_LICENSE("GPL");

 

 

---------------和以前2440 之类的显示驱动比较了一下，发现，S5pv210 最大的不同就是 本身的控制器复杂强大了，这些驱动就会有相应的改变。

欲知详情，请看我博客的后续分析，今天只是看了一些，还没太深入。