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initial bits of driver for Hitachi HD44780-compatible LCD controllers.
machine dependent part sits in p64lcd.c;
it doesn't initialize LCD properly - missed some timings, i think.

unfortunately, i have fryed my brand-new 16x4 LCD and can't continue work right now..
very sadly, R.I.P :(

/*
 * $Id: 44780_dev.c,v 1.1 2008/01/07 20:24:48 nbrk Exp $
 */
#include <sys/types.h>
#include <sys/device.h>
#include <sys/gpio.h>
#include <dev/lcd/44780var.h>
#include <dev/lcd/44780reg.h>


/*
 * Driver for Hitachi 44780-based LCD.
 */

int 	h44780_attach(struct device *, uint32_t, uint8_t);
void	h44780_write(struct h44780_dd *ddp, uint16_t data);
void	h44780_strobe(struct h44780_dd *ddp);
void	h44780_init(struct h44780_dd *ddp);

struct driver h44780_dr = {
	sizeof(struct h44780_dd),
	h44780_attach,
	NULL,
	NULL
};


int
h44780_attach(struct device *self, uint32_t loc, uint8_t flags)
{
	struct h44780_dd *ddp = self->dv_devdata;
	ddp->h_bop = self->dv_parent->dv_aux;

	printf("Hitachi 44780 LCD controller\n");

	h44780_init(ddp);

	return(0);
}


void
h44780_write(struct h44780_dd *ddp, uint16_t data)
{
	printf("h44780_write: write 0x%x\n", data);
	ddp->h_bop->write(ddp->h_bop->selfdd, data);

}


void
h44780_strobe(struct h44780_dd *ddp)
{
	ddp->h_bop->strobe(ddp->h_bop->selfdd);

}


void
h44780_init(struct h44780_dd *ddp)
{
	h44780_write(ddp, H44780_CMD_IFLEN | H44780_DL | H44780_N | H44780_F);
//	h44780_strobe(ddp);
	H44780_DELAY;
	h44780_write(ddp, H44780_CMD_IFLEN | H44780_DL | H44780_N | H44780_F);
//	h44780_strobe(ddp);
	H44780_DELAY;
	h44780_write(ddp, H44780_CMD_IFLEN | H44780_DL | H44780_N | H44780_F);
//	h44780_strobe(ddp);
	H44780_DELAY;
	h44780_write(ddp, H44780_CMD_ENABLE | H44780_B | H44780_C | H44780_D);
//	h44780_strobe(ddp);
	H44780_DELAY;
	h44780_write(ddp, H44780_CMD_CLS);
//	h44780_strobe(ddp);
	H44780_DELAY;
	h44780_write(ddp, H44780_CMD_SETDIR | H44780_ID | H44780_S);
//	h44780_strobe(ddp);
	h44780_write(ddp, 0);
//	h44780_strobe(ddp);
H44780_DELAY;
	h44780_write(ddp, 0x38);
//	h44780_strobe(ddp);
H44780_DELAY;
	h44780_write(ddp, 0);
//	h44780_strobe(ddp);
H44780_DELAY;
	h44780_write(ddp, 0x0f);
//	h44780_strobe(ddp);
}