vfd.c

AT91RM9200的完整启动代码：包括loader, boot及U-boot三部分均已编译通过！欢迎下载使用！

void set_vfd_pixel(unsigned char x, unsigned char y,
		   unsigned char color, unsigned char display,
		   unsigned char value)
{
	DECLARE_GLOBAL_DATA_PTR;
	ulong adr;
	unsigned char bit_nr, temp;

	if (! gd->vfd_type) {
		/* Unknown type. */
		return;
	}

	/* Pixel-Eintrag Nr. 1 */
	adr = adr_vfd_table[x][y][color][display][0];
	/* Pixel-Eintrag Nr. 1 */
	bit_nr = bit_vfd_table[x][y][color][display][0];
	temp=(*(volatile unsigned char*)(adr));

	if (value)
		temp |=  (1<<bit_nr);
	else
		temp &= ~(1<<bit_nr);

	(*(volatile unsigned char*)(adr))=temp;
}

/*
 * transfer image from BMP-File
 */
void transfer_pic(int display, unsigned char *adr, int height, int width)
{
	int x, y;
	unsigned char temp;

	for (; height > 0; height -= 18)
	{
		if (height > 18)
			y = 18;
		else
			y = height;
		for (; y > 0; y--)
		{
			for (x = 0; x < width; x += 2)
			{
				temp = *adr++;
				set_vfd_pixel(x, y-1, 0, display, 0);
				set_vfd_pixel(x, y-1, 1, display, 0);
				if ((temp >> 4) == BLAU)
					set_vfd_pixel(x, y-1, 0, display, 1);
				else if ((temp >> 4) == ROT)
					set_vfd_pixel(x, y-1, 1, display, 1);
				else if ((temp >> 4) == VIOLETT)
				{
					set_vfd_pixel(x, y-1, 0, display, 1);
					set_vfd_pixel(x, y-1, 1, display, 1);
				}
				set_vfd_pixel(x+1, y-1, 0, display, 0);
				set_vfd_pixel(x+1, y-1, 1, display, 0);
				if ((temp & 0x0F) == BLAU)
					set_vfd_pixel(x+1, y-1, 0, display, 1);
				else if ((temp & 0x0F) == ROT)
					set_vfd_pixel(x+1, y-1, 1, display, 1);
				else if ((temp & 0x0F) == VIOLETT)
				{
					set_vfd_pixel(x+1, y-1, 0, display, 1);
					set_vfd_pixel(x+1, y-1, 1, display, 1);
				}
			}
		}
		if (display > 0)
			display--;
		else
			display = 3;
	}
}

/*
 * This function initializes VFD clock that is needed for the CPLD that
 * manages the keyboard.
 */
int vfd_init_clocks (void)
{

	/* try to determine display type from the value
	 * defined by pull-ups
	 */
	rPCUP = (rPCUP & 0xFFF0);	/* activate  GPC0...GPC3 pullups */
	rPCCON = (rPCCON & 0xFFFFFF00);	/* configure GPC0...GPC3 as inputs */
	udelay (10);				/* allow signals to settle */
	vfd_board_id = (~rPCDAT) & 0x000F;	/* read GPC0...GPC3 port pins */

	VFD_DISABLE;				/* activate blank for the vfd */

#define	NEW_CPLD_CLK

#ifdef NEW_CPLD_CLK
	if (vfd_board_id) {
		/* If new board revision, then use PWM 3 as cpld-clock */
		/* Enable 500 Hz timer for fill level sensor to operate properly */
		/* Configure TOUT3 as functional pin, disable pull-up */
		rPDCON &= ~0x30000;
		rPDCON |= 0x20000;
		rPDUP |= (1 << 8);

		/* Configure the prescaler */
		rTCFG0 &= ~0xff00;
		rTCFG0 |= 0x0f00;

		/* Select MUX input (divider) for timer3 (1/16) */
		rTCFG1 &= ~0xf000;
		rTCFG1 |= 0x3000;

		/* Enable autoreload and set the counter and compare
		 * registers to values for the 500 Hz clock
		 * (for a given  prescaler (15) and divider (16)):
		 * counter = (66000000 / 500) >> 9;
		 */
		rTCNTB3 = 0x101;
		rTCMPB3 = 0x101 / 2;

		/* Start timer */
		rTCON = (rTCON | UPDATE3 | RELOAD3) & ~INVERT3;
		rTCON = (rTCON | START3) & ~UPDATE3;
	}
#endif
	/* If old board revision, then use vm-signal as cpld-clock */
	rLCDCON2 = 0x00FFC000;
	rLCDCON3 = 0x0007FF00;
	rLCDCON4 = 0x00000000;
	rLCDCON5 = 0x00000400;
	rLCDCON1 = 0x00000B75;
	/* VM (GPD1) is used as clock for the CPLD */
	rPDCON = (rPDCON & 0xFFFFFFF3) | 0x00000008;

	return 0;
}

/*
 * initialize LCD-Controller of the S3C2400 for using VFDs
 *
 * VFD detection depends on the board revision:
 * starting from Rev. 200 a type code can be read from the data pins,
 * driven by some pull-up resistors; all earlier systems must be
 * manually configured. The type is set in the "vfd_type" environment
 * variable.
 */
int drv_vfd_init(void)
{
	char *tmp;
	ulong palette;
	static int vfd_init_done = 0;
	int vfd_inv_data = 0;

	DECLARE_GLOBAL_DATA_PTR;

	if (vfd_init_done != 0)
		return (0);
	vfd_init_done = 1;

	debug("Detecting Revison of WA4-VFD: ID=0x%X\n", vfd_board_id);

	switch (vfd_board_id) {
	case 0:			/* board revision < Rev.200 */
		if ((tmp = getenv ("vfd_type")) == NULL) {
			break;
		}
		if (strcmp(tmp, "T119C") == 0) {
			gd->vfd_type = VFD_TYPE_T119C;
		} else if (strcmp(tmp, "MN11236") == 0) {
			gd->vfd_type = VFD_TYPE_MN11236;
		} else {
			/* cannot use printf for a warning here */
			gd->vfd_type = 0;	/* unknown */
		}

		break;
	default:		/* default to MN11236, data inverted */
		gd->vfd_type = VFD_TYPE_MN11236;
		vfd_inv_data = 1;
		setenv ("vfd_type", "MN11236");
	}
	debug ("VFD type: %s%s\n",
		(gd->vfd_type == VFD_TYPE_T119C)   ? "T119C" :
		(gd->vfd_type == VFD_TYPE_MN11236) ? "MN11236" :
		"unknown",
		vfd_inv_data ? ", inverted data" : "");

	gd->fb_base = gd->fb_base;
	create_vfd_table();
	init_grid_ctrl();

	for (palette=0; palette < 16; palette++)
		(*(volatile unsigned int*)(PALETTE+(palette*4)))=palette;
	for (palette=16; palette < 256; palette++)
		(*(volatile unsigned int*)(PALETTE+(palette*4)))=0x00;

	/*
	 * Hinweis: Der Framebuffer ist um genau ein Nibble verschoben
	 * Das erste angezeigte Pixel wird aus dem zweiten Nibble geholt
	 * das letzte angezeigte Pixel wird aus dem ersten Nibble geholt
	 * (wrap around)
	 * see manual S3C2400
	 */
	/* Stopp LCD-Controller */
	rLCDCON1 = 0x00000000;
	/* frame buffer startadr */
	rLCDSADDR1 = gd->fb_base >> 1;
 	/* frame buffer endadr */
	rLCDSADDR2 = (gd->fb_base + FRAME_BUF_SIZE) >> 1;
	rLCDSADDR3 = ((256/4));
rLCDCON2 = 0x000DC000;
	if(gd->vfd_type == VFD_TYPE_MN11236)
		rLCDCON2 = 37 << 14;	/* MN11236: 38 lines */
	else
		rLCDCON2 = 55 << 14;	/* T119C:   56 lines */
	rLCDCON3 = 0x0051000A;
	rLCDCON4 = 0x00000001;
	if (gd->vfd_type && vfd_inv_data)
		rLCDCON5 = 0x000004C0;
	else
		rLCDCON5 = 0x00000440;

	/* Port pins as LCD output */
	rPCCON =   (rPCCON & 0xFFFFFF00)| 0x000000AA;
	rPDCON =   (rPDCON & 0xFFFFFF03)| 0x000000A8;

	/* Synchronize VFD enable with LCD controller to avoid flicker	*/
	rLCDCON1 = 0x00000B75;			/* Start LCD-Controller	*/
	while((rLCDCON5 & 0x180000)!=0x100000);	/* Wait for end of VSYNC */
	while((rLCDCON5 & 0x060000)!=0x040000);	/* Wait for next HSYNC	*/
	while((rLCDCON5 & 0x060000)==0x040000);
	while((rLCDCON5 & 0x060000)!=0x000000);
	if(gd->vfd_type)
		VFD_ENABLE;

	debug ("LCDSADDR1: %lX\n", rLCDSADDR1);
	debug ("LCDSADDR2: %lX\n", rLCDSADDR2);
	debug ("LCDSADDR3: %lX\n", rLCDSADDR3);

	return 0;
}

/*
 * Disable VFD: should be run before resetting the system:
 * disable VM, enable pull-up
 */
void disable_vfd (void)
{
	VFD_DISABLE;
	rPDCON &= ~0xC;
	rPDUP  &= ~0x2;
}

/************************************************************************/
/* ** ROM capable initialization part - needed to reserve FB memory	*/
/************************************************************************/

/*
 * This is called early in the system initialization to grab memory
 * for the VFD controller.
 *
 * Note that this is running from ROM, so no write access to global data.
 */
ulong vfd_setmem (ulong addr)
{
	ulong size;

	/* Round up to nearest full page */
	size = (FRAME_BUF_SIZE + (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);

	debug ("Reserving %ldk for VFD Framebuffer at: %08lx\n", size>>10, addr);

	return (size);
}

#endif /* CONFIG_VFD */