添加LTV350QV的FB驱动到基于linux-2.6.26的GEC2440开发板
1，编译配置内核
root@yuanxh-desktop:/home/yuanxh/s3c2410/linux-2.6.26-9g24x0# make menuconfig
进入配置菜单添加驱动到内核：
Device Drivers --->
Graphics support --->
<*> Support for frame buffer devices --->
<*> S3C2410 LCD framebuffer support
2，修改arch/arm/mach-s3c2440/mach-smdk2440.c文件
root@yuanxh-desktop:/home/yuanxh/s3c2410/linux-2.6.26-9g24x0# vi arch/arm/mach-s3c2440/mach-smdk2440.c
把static struct s3c2410fb_display smdk2440_lcd_cfg __initdata 修改成：
// change by yuanxihua@21cn.com
static struct s3c2410fb_display smdk2440_lcd_cfg __initdata = {
.lcdcon5 = S3C2410_LCDCON5_FRM565 |
S3C2410_LCDCON5_INVVCLK |
S3C2410_LCDCON5_INVVLINE |
S3C2410_LCDCON5_INVVFRAME |
// S3C2410_LCDCON5_INVVD |
// S3C2410_LCDCON5_INVVDEN |
// S3C2410_LCDCON5_PWREN |
// S3C2410_LCDCON5_BSWP |
S3C2410_LCDCON5_HWSWP,
.type = S3C2410_LCDCON1_TFT,
.width = 320,
.height = 240,
.pixclock = 270000, /* HCLK 60 MHz, divisor 10 */
.xres = 320,
.yres = 240,
.bpp = 16,
.left_margin = 21,
.right_margin = 14,
.hsync_len = 19,
.upper_margin = 6,
.lower_margin = 5,
.vsync_len = 4,
};
把static struct s3c2410fb_mach_info smdk2440_fb_info __initdata修改成：
// change by yuanxihua@21cn.com
static struct s3c2410fb_mach_info smdk2440_fb_info __initdata = {
.displays = &smdk2440_lcd_cfg,
.num_displays = 1,
.default_display = 0,
#if 1
/* currently setup by downloader */
.gpccon = 0xaa9556a9,
.gpccon_mask = 0xffffffff,
.gpcup = 0xffffffff,
.gpcup_mask = 0xffffffff,
.gpdcon = 0xaaaaaaaa,
.gpdcon_mask = 0xffffffff,
.gpdup = 0xffffffff,
.gpdup_mask = 0xffffffff,
#endif
.lpcsel = 0,
};
把s3c24xx_init_clocks(16934400);修改成：
// s3c24xx_init_clocks(16934400); // change by yuanxihua@21cn.com
s3c24xx_init_clocks(12000000);
3，修改include/asm-arm/arch-s3c2410/regs-lcd.h文件
root@yuanxh-desktop:/home/yuanxh/s3c2410/linux-2.6.26-9g24x0# vi include/asm-arm/arch-s3c2410/regs-lcd.h
把#define S3C2410_LCDCON1_MMODE (1<<7)修改成：
//#define S3C2410_LCDCON1_MMODE (1<<7)
#define S3C2410_LCDCON1_MMODE (0<<7) // change by yuanxihua@21cn.com
4，修改drivers/video/s3c2410fb.c文件
root@yuanxh-desktop:/home/yuanxh/s3c2410/linux-2.6.26-9g24x0# vi drivers/video/s3c2410fb.c
在第51行的/* useful functions */后添加：
/************************************************/
//LTV350QV_FOE_V0.0
#define LTV350QV_FOE 0x1d //device ID
typedef struct _LTV350qv_spi_data_{
unsigned char Device_ID; //ID of the device
unsigned int Index; //index of register
unsigned long Structure; //structure to be writed
}LTV350QV_SPI_Data;
//micro for LTV350QV_FOE
#define CS_H __raw_writel(__raw_readl(S3C2410_GPCDAT) |(1<< 8), S3C2410_GPCDAT)//MAKE_HIGH(LTV350QV_CS)
#define CS_L __raw_writel(__raw_readl(S3C2410_GPCDAT)&~(1<< 8), S3C2410_GPCDAT)//MAKE_LOW(LTV350QV_CS)
#define SCLK_H __raw_writel(__raw_readl(S3C2410_GPCDAT) |(1<< 9), S3C2410_GPCDAT)//MAKE_HIGH(LTV350QV_SCL)
#define SCLK_L __raw_writel(__raw_readl(S3C2410_GPCDAT)&~(1<< 9), S3C2410_GPCDAT)//MAKE_LOW(LTV350QV_SCL)
#define SDI_H __raw_writel(__raw_readl(S3C2410_GPCDAT) |(1<<10), S3C2410_GPCDAT)//MAKE_HIGH(LTV350QV_SDI)
#define SDI_L __raw_writel(__raw_readl(S3C2410_GPCDAT)&~(1<<10), S3C2410_GPCDAT)//MAKE_LOW(LTV350QV_SDI)
#define RST_H __raw_writel(__raw_readl(S3C2410_GPDDAT) |(1<< 0), S3C2410_GPDDAT)//MAKE_HIGH(LTV350QV_RST)
#define RST_L __raw_writel(__raw_readl(S3C2410_GPDDAT)&~(1<< 0), S3C2410_GPDDAT)//MAKE_LOW(LTV350QV_RST)
//***************************************************************
//**********these functions for SUMSUN LTV350QV TFT LCD****************
//***************************************************************
static void LTV350QV_Short_Delay(u_char time)
{
ndelay(150);
}
/*
static void LTV350QV_Rst(void)
{
RST_L;
mdelay(1);
RST_H;
mdelay(1);
}
*/
static void LTV350QV_Register_Write(LTV350QV_SPI_Data regdata)
{
u_char i,temp1;
u_int temp2;
u_long temp3;
unsigned long flags;
//write index
temp1=regdata.Device_ID<<2 | 0<<1 | 0<<0; //register index
temp2=regdata.Index;
temp3=(temp1<<24) | (temp2<<8);
local_irq_save(flags);
CS_L;
LTV350QV_Short_Delay(1);
for(i=0;i<24;i++)
{
SCLK_L;
if(temp3 & (1<<(31-i)) ) //if is H
SDI_H;
else
SDI_L;
LTV350QV_Short_Delay(1); //setup time
SCLK_H;
LTV350QV_Short_Delay(1); //hold time
}
CS_H;
LTV350QV_Short_Delay(5);
//write instruction
temp1=regdata.Device_ID<<2 | 1<<1 | 0<<0; //instruction
temp2=regdata.Structure;
temp3=(temp1<<24) | (temp2<<8);
CS_L;
LTV350QV_Short_Delay(1);
for(i=0;i<24;i++)
{
SCLK_L;
if(temp3 & (1<<(31-i)) ) //if is H
SDI_H;
else
SDI_L;
LTV350QV_Short_Delay(1);
SCLK_H;
LTV350QV_Short_Delay(1);
}
CS_H;
local_irq_restore(flags);
}
/****************************************
* *
****************************************/
static void LTV350QV_Write(u_int index, u_int regdata)
{
LTV350QV_SPI_Data WriteData;
WriteData.Device_ID = LTV350QV_FOE;
WriteData.Index = index;
WriteData.Structure = regdata;
LTV350QV_Register_Write(WriteData);
}
/****************************************
* *power ON sequence
****************************************/
static void LTV350QV_Power_ON(void)
{
LTV350QV_Write( 9, 0x0000);
mdelay(150);
LTV350QV_Write( 9, 0x4000);
LTV350QV_Write(10, 0x2000);
LTV350QV_Write( 9, 0x4055);
mdelay(550);
LTV350QV_Write( 1, 0x409d);
LTV350QV_Write( 2, 0x0204);
LTV350QV_Write( 3, 0x0100);
LTV350QV_Write( 4, 0x3000);
LTV350QV_Write( 5, 0x4003);
LTV350QV_Write( 6, 0x000a);
LTV350QV_Write( 7, 0x0021);
LTV350QV_Write( 8, 0x0c00);
LTV350QV_Write(10, 0x0103);
LTV350QV_Write(11, 0x0301);
LTV350QV_Write(12, 0x1f0f);
LTV350QV_Write(13, 0x1f0f);
LTV350QV_Write(14, 0x0707);
LTV350QV_Write(15, 0x0307);
LTV350QV_Write(16, 0x0707);
LTV350QV_Write(17, 0x0000);
LTV350QV_Write(18, 0x0004);
LTV350QV_Write(19, 0x0000);
mdelay(200);
LTV350QV_Write( 9, 0x4a55);
LTV350QV_Write( 5, 0x5003);
}
/**********************************
* *power OFF sequence
**********************************/
/*static void LTV350QV_Powen_OFF(void)
{
LTV350QV_Write( 9, 0x4055);// GON -> 0, POC -> 0
LTV350QV_Write( 5, 0x4003);// DSC -> 0
LTV350QV_Write(10, 0x0000);// VCOMG -> 0
mdelay(20);
LTV350QV_Write( 9, 0x4000);// AP[2:0] -> 000
}*/
static void s3c2440fb_init_ltv350qv(void)
{
__raw_writel(0xaa9556a9, S3C2410_GPCCON); //Initialize VD[7:0],LCDVF[2:0],VM,VFRAME,VLINE,VCLK,LEND
//LCDVF[0],[1],[2]---output;VD[0],[1],[2]----output.
__raw_writel(0xffffffff, S3C2410_GPCUP); // Disable Pull-up register
LTV350QV_Power_ON() ; //init LCD model
__raw_writel(0xaaaaaaaa, S3C2410_GPDCON);
__raw_writel(0xffffffff, S3C2410_GPDUP);
// __raw_writel(3, S3C2410_LCDINTMSK); // MASK LCD Sub Interrupt
// __raw_writel(0, S3C2410_TPAL); // Disable Temp Palette
// __raw_writel(0, S3C2410_LPCSEL); // Disable LPC3600
}
在static int s3c2410fb_init_registers(struct fb_info *info)的 return 0;前添加：
s3c2440fb_init_ltv350qv();
5, 编译内核生成驱动
root@yuanxh-desktop:/home/yuanxh/s3c2410/linux-2.6.26-9g24x0# make
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