s3c6410_lcd&framebuffer驱动分析(二)

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1、ints3cfb_init_registers(s3cfb_info_t*fbi){   structclk*lcd_clock;//LCD时钟来源   structfb_var_screeninfo*var=&fbi->fb.var;//可变参数   unsignedlongflags=0,page_width=0,offset=0;   unsignedlongvideo_phy_temp_f1=fbi->screen_dma_f1;/**缓存物理地址*/   unsignedlongvideo_phy_temp_f2=fbi->screen_dma_f2;   in

2、twin_num= fbi->win_id;   /*InitialiseLCDwithvaluesfromhare*/   local_irq_save(flags);   page_width=var->xres*s3cfb_fimd.bytes_per_pixel;   offset=(var->xres_virtual-var->xres)*s3cfb_fimd.bytes_per_pixel;/**偏移量,应该就是左边界距离吧   if(win_num==0){      s3cfb_fimd.vidcon0=s3cfb_fimd.vidcon0&~(S3C_V

3、IDCON0_ENVID_ENABLE

4、S3C_VIDCON0_ENVID_F_ENABLE);      writel(s3cfb_fimd.vidcon0,S3C_VIDCON0);//视频输出及显示控制信号使能      lcd_clock=clk_get(NULL,"lcd");//获取视频时钟源      s3cfb_fimd.vidcon0

5、=S3C_VIDCON0_CLKVAL_F((int)((clk_get_rate(lcd_clock)/s3cfb_fimd.pixclock)-1));#ifdefined(CONFIG_FB_S3C_EXT_VIRT

6、UAL_SCREEN)      offset=0;      s3cfb_fimd.vidw00add0b0=video_phy_temp_f1;      s3cfb_fimd.vidw00add0b1=video_phy_temp_f2;      s3cfb_fimd.vidw00add1b0=S3C_VIDWxxADD1_VBASEL_F((unsignedlong)video_phy_temp_f1+(page_width+offset)*(var->yres));      s3cfb_fimd.vidw00add1b1=S3C_VIDWxxADD1_VBA

7、SEL_F((unsignedlong)video_phy_temp_f2+(page_width+offset)*(var->yres));#endif    }   writel(video_phy_temp_f1,S3C_VIDW00ADD0B0+(0x08*win_num));   writel(S3C_VIDWxxADD1_VBASEL_F((unsignedlong)video_phy_temp_f1+(page_width+offset)*(var->yres)),S3C_VIDW00ADD1B0+(0x08*win_num));   writel(S3C_

8、VIDWxxADD2_OFFSIZE_F(offset)

9、(S3C_VIDWxxADD2_PAGEWIDTH_F(page_width)),S3C_VIDW00ADD2+(0x04*win_num));   if(win_num<2){      writel(video_phy_temp_f2,S3C_VIDW00ADD0B1+(0x08*win_num));      writel(S3C_VIDWxxADD1_VBASEL_F((unsignedlong)video_phy_temp_f2+(page_width+offset)*(var->yres)),S3C_V

10、IDW00ADD1B1+(0x08*win_num));   }/*********下面就是往各种寄存器里面写东西,初始化各个窗口所对应的寄存器等**/   switch(win_num){   case0:      writel(s3cfb_fimd.wincon0,S3C_WINCON0);      writel(s3cfb_fimd.vidcon0,S3C_VIDCON0);      writel(s3cfb_fimd.vidcon1,S3C_VIDCON1);      writel(s3cfb_fimd.vid