smdkc110 在uboot下测试LCD

最近在开发板上飞了一块新的lcd，不晓得是不是因为飞线太复杂的缘故，通过kernel的时候屏幕就是不亮，通过spec配置基本都一样。然后就想通过最原始的方式来验证lcd，就是在uboot里初始化lcd，smdkc110里默认的是没有初始化lcd的，而且编译的话好像还有错，所以就自己写了一个lcd.c。用到以下两个文件就可以了

核心源码是/common/lcd.c   /cpu/s5pc11x /fimd.c

下面是lcd.c的代码

#include <config.h>
#include <common.h>
#include <command.h>
#include <version.h>
#include <stdarg.h>
#include <linux/types.h>
#include <devices.h>
#if defined(CONFIG_POST)
#include <post.h>
#endif
#include <lcd.h>
#include <watchdog.h>
#ifdef CONFIG_LCD

/************************************************************************/
/* ** FONT DATA */
/************************************************************************/
//#include <fonts.h> /* Get font data, width and height*/

#define LCD_WIDTH 1024
#define LCD_HEIGHT 600
#define LCD_BGCOLOR 0xffffff
#define LCD_SETCURSOR(Xpos,Ypos) (CFG_LCD_FBUFFER + Xpos*LCD_WIDTH*4 + Ypos*4)

static unsigned int TextColor = 0x0000;
static unsigned int BackColor = LCD_BGCOLOR;

void LCD_Initialize_NONAME1(void); //fimd.c中的LCD初始化函数


typedef struct vidinfo
{
    ushort    vl_col;        /* Number of columns (i.e. 640) */
    ushort    vl_row;        /* Number of rows (i.e. 480) */
    ushort    vl_width;    /* Width of display area in millimeters */
    ushort    vl_height;    /* Height of display area in millimeters */    /* LCD configuration register */
    u_char    vl_clkp;    /* Clock polarity */
    u_char    vl_oep;        /* Output Enable polarity */
    u_char    vl_hsp;        /* Horizontal Sync polarity */
    u_char    vl_vsp;        /* Vertical Sync polarity */
    u_char    vl_dp;        /* Data polarity */
    u_char    vl_bpix;    /* Bits per pixel, 0 = 1, 1 = 2, 2 = 4, 3 = 8, 4 = 16 */
    u_char    vl_lbw;        /* LCD Bus width, 0 = 4, 1 = 8 */
    u_char    vl_splt;    /* Split display, 0 = single-scan, 1 = dual-scan */
    u_char    vl_clor;    /* Color, 0 = mono, 1 = color */
    u_char    vl_tft;        /* 0 = passive, 1 = TFT */    /* Horizontal control register. Timing from data sheet */
    ushort    vl_hpw;        /* Horz sync pulse width */
    u_char    vl_blw;        /* Wait before of line */
    u_char    vl_elw;        /* Wait end of line */    /* Vertical control register. */
    u_char    vl_vpw;        /* Vertical sync pulse width */
    u_char    vl_bfw;        /* Wait before of frame */
    u_char    vl_efw;        /* Wait end of frame */    /* PXA LCD controller params */
    //struct    pxafb_info pxa;
} vidinfo_t;

vidinfo_t panel_info = {1024,600,1024,600,1,1,1,1,1,24,0,0,0,1,40,56,56,20,8,8};

/*
 * Frame buffer memory information
 */
//void *lcd_base; /* Start of framebuffer memory*/

static int lcd_init ();
void lcd_Enable (void);



/************************************************************************/
/* ** GENERIC Initialization Routines */
/************************************************************************/
int drv_lcd_init (void)
{
    device_t lcddev;
    int rc;
    // lcd_base = (void*)CFG_LCD_FBUFFER;

    lcd_init (); /* LCD initialization */
#ifdef CONFIG_NO_VIDEO_CONSOLE
    return 0;
#endif
    // Device initialization
    memset (&lcddev, 0, sizeof (lcddev));
    strcpy (lcddev.name, "lcd");
    lcddev.ext = 0;
    lcddev.flags = DEV_FLAGS_OUTPUT;
    ///cddev.putc = lcd_putc;
    //lcddev.puts = lcd_puts;
    rc = device_register (&lcddev); //重定向输出信息
    return (rc == 0) ? 1 : rc;
}
/*----------------------------------------------------------------------*/
static int lcd_init ()
{
    /* Initialize the lcd controller */
    printf("LCD Initializing......");
    //LCD_Initialize_NONAME1();
    LCD_Init(1);//上面的其实也可以初始化lcd
    printf("complete\n");
    LCD_clear(); //刷蓝色背景色
    //LCD_DisplayChar(0,0,'E'); //在（0,0）处写字母”E”
    return 0;
}
#if 0
void LCD_DrawChar(u16 Xpos, u16 Ypos, char *c)
{
  u32 index = 0, i = 0;
  u16 Xaddress = 0;
   Xaddress = Xpos;
    u32* pBuffer = (u32*)LCD_SETCURSOR(Xaddress, Ypos);
  for(index = 0; index < 24; index++)
  {
    for(i = 0; i < 16; i++)
    {
      if((c[index] & (1 << i)) == 0x00)
      {
        *pBuffer++ = BackColor;
      }
      else
      {
        *pBuffer++ = TextColor;
      }
    }
    Xaddress++;
    pBuffer = (u32*)LCD_SETCURSOR(Xaddress, Ypos);
  }
}

void LCD_DisplayChar(u16 Line, u16 Column, u8 Ascii)
{
  Ascii -= 32;
  LCD_DrawChar(Line, Column, &ASCII_Table[Ascii * 24]);
}
#endif
void LCD_clear()
{
    u16 i, j;
    u32* pBuffer = (u32*)CFG_LCD_FBUFFER;
    for (i=0; i < LCD_HEIGHT; i++)
    {
        for (j=0; j < LCD_WIDTH; j++)
        {
            *pBuffer++ = BackColor;
        }
    }
}
ulong calc_fbsize (void)
{
     ulong size;

     int line_length = (panel_info.vl_col * panel_info.vl_bpix) / 8;
     size = line_length * panel_info.vl_row;
#ifdef CFG_LCD_FBUFFER
     size = 2457600;
#endif
     return size;
}
/************************************************************************/
/* ** ROM capable initialization part - needed to reserve FB memory*/
/************************************************************************/
/*
 * This is called early in the system initialization to grab memory
 * for the LCD controller.
 * Returns new address for monitor, after reserving LCD buffer memory
 *
 * Note that this is running from ROM, so no write access to global data.
 */
ulong lcd_setmem (ulong addr)
{
    ulong size;
    int line_length = (panel_info.vl_col * panel_info.vl_bpix) / 8;
    debug ("LCD panel info: %d x %d, %d bit/pix\n",
    panel_info.vl_col, panel_info.vl_row, NBITS (panel_info.vl_bpix) );
    size = line_length * panel_info.vl_row;
#ifdef CFG_LCD_FBUFFER
     size = 2457600; //1024*600*4 bytes
#endif
    /* Round up to nearest full page */
    size = (size + (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
    /* Allocate pages for the frame buffer. */
    addr -= size;
    debug ("Reserving %ldk for LCD Framebuffer at: %08lx\n", size>>10, addr);
    return (addr);
}

int do_clearlcd(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
    printf("huabinbin test do_clearlcd");
    drv_lcd_init();
}
#endif /* CONFIG_LCD */

如果有需要的话你还可以再LCD_Init(1)这个函数去修改一些极性配置，我的平台

Outp32(0xf8000004, 0x016EC080);  这里可以修改那四个参数的极性配置。

只是很遗憾，屏幕显示的效果还是和kernel一样，但我想应该不影响这篇文章的正确性，等打好板子再来确认一下，这也是怕自己到时忘了，所以先记录下来！