lcdspi.c

Samsung LCD驱动（SPI接口）

void spi_write_gram(unsigned short data)
{
	unsigned char bytes[3] = {0,0,0};

	spi_select_register(0x22);

	bytes[0] = START_BYTE(RS_CONTROL_REGISTER, RW_WRITE);	// = 0x76
	bytes[1] = (unsigned char)(data>>8);
	bytes[2] = (unsigned char)data;
	spi_transaction(bytes,3);
}

void delay_100us(void)
{ 
	udelay(100);
}

void delay_10ms(void)
{
	mdelay(10);
}

void delay_20ms(void)
{
	mdelay(20);
}	

void delay_100ms(void)
{
	mdelay(100);
}	

void LCDWriteReg(unsigned short R)
{
#ifdef Samsung_22
	unsigned char bytes[2]={0,0};
	unsigned char byte_zero[1]={0};

	bytes[0] = (unsigned char)(R>>8);
	bytes[1] = (unsigned char)R;

	//2 Send Option 1: 8bit or 16bit
	//2 Send Option 2: data sequence
	//2 Send Option 3: drive RS manually 
	//GPCR2 |= GPIO_bit(77);
	spi_transaction(bytes, 1);
	//spi_transaction(byte_zero, 1);
	//GPSR2 |= GPIO_bit(77);
	spi_transaction(&bytes[1], 1);
	//spi_transaction(byte_zero, 1);
#else
	unsigned short index = (R >> 8);
	unsigned short data = (R & 0xff);
	
	spi_write_register(index, data);
#endif
}

void   SS_22_PowerSetting_1(void)
{
	delay_100us();
	LCDWriteReg(0x2201);    
	delay_100us();
	LCDWriteReg(0x0301);
}

void   SS_22_PowerSetting_2(void)
{
	delay_20ms();
	LCDWriteReg(0x1d08);     
	delay_20ms(); 
	delay_20ms();  
	LCDWriteReg(0x2300);        	
	delay_20ms();
	LCDWriteReg(0x2494);        	
	delay_20ms();
	LCDWriteReg(0x256f);      
	delay_20ms();    	
}

void   SS_22_PowerSetting_3(void)
{
	LCDWriteReg(0x281e);    
	delay_20ms();
	LCDWriteReg(0x1a00);        	
	delay_20ms();
	LCDWriteReg(0x2110);        	
	delay_20ms();
	LCDWriteReg(0x1825);        	
	delay_20ms();
	delay_20ms();    	
	LCDWriteReg(0x1948);        	
	delay_20ms();
	LCDWriteReg(0x18e5);        	
	delay_20ms();
	delay_20ms();     
	LCDWriteReg(0x18f7);        	
	delay_20ms();
	delay_20ms();    
	LCDWriteReg(0x1b07);        	
	delay_20ms();
	delay_20ms();    
	LCDWriteReg(0x1f5a);    
	delay_20ms();
	LCDWriteReg(0x2054);        	
	delay_20ms();
	LCDWriteReg(0x1ec1);        	
	delay_20ms();
	delay_20ms();    
	LCDWriteReg(0x2100);        	
	delay_100us();
	LCDWriteReg(0x3b01);        	
	delay_20ms();
	delay_20ms();    
	LCDWriteReg(0x0020);        	
	delay_20ms();
	LCDWriteReg(0x0201);        	
	delay_20ms();
	delay_20ms();
}

void SS_22_InitialFunction_1(void)
{
	LCDWriteReg(0x00a0);    
	delay_100us();
	LCDWriteReg(0x0110);        	
	delay_100us();
	LCDWriteReg(0x0200);        
	delay_20ms();
	LCDWriteReg(0x0500);        	
	delay_20ms();
	LCDWriteReg(0x0d00);        	
	delay_20ms();
	delay_20ms();
}

void SS_22_InitialFunction_2(void)
{  
	LCDWriteReg(0x0e00);    
	delay_100us();
	LCDWriteReg(0x0f00);        	
	delay_100us();
	LCDWriteReg(0x1000);        	
	delay_100us();
	LCDWriteReg(0x1100);
	delay_100us();
	LCDWriteReg(0x1200);    
	delay_100us(); 
	LCDWriteReg(0x1300);    	
	delay_100us();
	LCDWriteReg(0x1400);    	
	delay_100us();
	LCDWriteReg(0x1500);
	delay_100us();
	LCDWriteReg(0x1600);    	
	delay_100us();
	LCDWriteReg(0x1700);    	
	delay_100us();
	LCDWriteReg(0x3401);    	
	delay_100us();       
	LCDWriteReg(0x3500);    	
}

void SS_22_InitialFunction_3(void)
{ 
	LCDWriteReg(0x8d01);
	delay_100us();
	LCDWriteReg(0x8b28);    	
	delay_100us();
	LCDWriteReg(0x4b00);    	
	delay_100us();
	LCDWriteReg(0x4c00);    	
	delay_100us();
	LCDWriteReg(0x4d00);    	
	delay_100us();
	LCDWriteReg(0x4e00);    	
	delay_100us();
	LCDWriteReg(0x4f00);    	
	delay_100us();
	LCDWriteReg(0x5000);    	
	delay_100us();
	LCDWriteReg(0x8600);    	
	delay_100us();
	LCDWriteReg(0x8726);    	
	delay_100us();
	LCDWriteReg(0x8802);    	
	delay_100us();
	LCDWriteReg(0x8905);    	
	delay_100us();
	LCDWriteReg(0x3301);    	
	delay_100us();
	LCDWriteReg(0x3706);    	
	delay_100us();
	LCDWriteReg(0x7600);    	
	delay_100us();
}

void SS_22_InitialFunction_4(void)
{   
	LCDWriteReg(0x4200);
	delay_100us();
	LCDWriteReg(0x4300);    	
	delay_100us();
	LCDWriteReg(0x4400);    	
	delay_100us();
	LCDWriteReg(0x4500);    	
	delay_100us();
	LCDWriteReg(0x46ef);    	
	delay_100us();
	LCDWriteReg(0x4700);    	
	delay_100us();
	LCDWriteReg(0x4800);    	
	delay_100us();
	LCDWriteReg(0x4901);    	
	delay_100us();
	LCDWriteReg(0x4a3f);    	
	delay_100us();
	LCDWriteReg(0x3c00);    	
	delay_100us();
	LCDWriteReg(0x3d00);    	
	delay_100us();
	LCDWriteReg(0x3e01);    	
	delay_100us();
	LCDWriteReg(0x3f3f);    	
	delay_100us();
	LCDWriteReg(0x4001);    	
	delay_100us();
	LCDWriteReg(0x410a);    	
	delay_100us();
}

void SS_22_InitialFunction_5(void)
{  
	LCDWriteReg(0x8f05);    	  
	delay_100us();
	LCDWriteReg(0x9005);
	delay_100us();
	LCDWriteReg(0x9144);    	
	delay_100us();
	LCDWriteReg(0x9244);    	
	delay_100us();
	LCDWriteReg(0x9344);
	delay_100us();
	LCDWriteReg(0x9433);    	
	delay_100us();
	LCDWriteReg(0x9505);    	
	delay_100us();
	LCDWriteReg(0x9605);    	
	delay_100us();
	LCDWriteReg(0x9744);    	
	delay_100us();
	LCDWriteReg(0x9844);    	
	delay_100us();
	LCDWriteReg(0x9944);    	
	delay_100us(); 
	LCDWriteReg(0x9a33);    	
	delay_100us();
	LCDWriteReg(0x9b33);    	
	delay_100us();
	LCDWriteReg(0x9c33);    	
	delay_100us();
	LCDWriteReg(0x9d80);    	
	delay_100us();
}

void Samsung_LCM_22(void)
{	  
	delay_10ms();
	SS_22_PowerSetting_1();	
	SS_22_InitialFunction_1();
	delay_20ms();
	delay_20ms(); //delay 40ms    
	SS_22_InitialFunction_2();    
	delay_20ms();
	delay_20ms(); //delay 40ms
	SS_22_InitialFunction_3();   
	delay_20ms();
	delay_20ms(); //delay 40ms 
	SS_22_InitialFunction_4();  	
	delay_20ms();
	delay_20ms(); //delay 40ms 
	SS_22_InitialFunction_5();  	
	delay_20ms();
	delay_20ms(); //delay 40ms   
	SS_22_PowerSetting_2();	
	delay_20ms();
	delay_20ms(); //delay 40ms   
	SS_22_PowerSetting_3();	   
}

static int __init modinit(void)
{
	//unsigned int reg;
	//unsigned int *io_base;	//SSP3 ioremap

	printk("It's me, Leon\n");
	
	/* The example code below display how register was mapped to memory */
	/*
	printk("GPDR0=%08x\n", GPDR0);	//__REG(0x40E0000C)
	reg = 0xf2e0000c;
	printk("GPDR0=%08x\n", *((unsigned int *)reg) );
	*/

	/* If SSP3 registers have not been mapped to memory, we can still handle that */
	/*
	io_base = ioremap(0x41900000, 0x1000);
	printk("io_base=%08x\n", io_base);
	printk("SSP3_SSCR0=%08x\n", *io_base);
	*/
	
	printk("SSP3_SSCR0=%08x\n", SSP3_SSCR0);

	/* We should set RS low */
	GAFR2_L &= 0xf3ffffff;	//L_BIAS GPIO 77
	GPCR2 |= GPIO_bit(77);

	ssp3_enable();

	mdelay(2000);
	Samsung_LCM_22();
	
	printk("GAFR2_U=%08x\n", GAFR2_U);
	printk("GAFR1_U=%08x\n", GAFR1_U);
	printk("SSP3_SSCR0=%08x\n", SSP3_SSCR0);
	printk("SSP3_SSCR1=%08x\n", SSP3_SSCR1);
	printk("SSP3_SSSR=%08x\n", SSP3_SSSR);

	/* Fixme: We might restore RS original setting */
	//GAFR2_L |= 0x08000000;	//L_BIAS GPIO 77

	return 0;
}

static void __exit modexit(void)
{
	ssp3_disable();
}

module_init(modinit);
module_exit(modexit);