hw_display.c

pocket pc hx4700 bootloader

/*
 * Copyright (C) 2006 Pawel Kolodziejski
 *
 * Some defines are from linux 2.6 kernel sources
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "types.h"
#include "pxa-regs.h"
#include "gpio.h"

int clear_screen(void) {
	int l;

	for (l = 0; l < 153600; l++) {
		*(char *)(0xA3000000 + l) = 0xff;
	}
}

int display_on(void) {
	lcd_power_on();
	pxafb_enable();
	pxafb_disable();
	pxafb_enable();
	backlight_power_on();
}

int lcd_power_on(void) {
	gpo_set(GPO_A716_LCD_ENABLE);
	gpo_set(GPO_A716_LCD_POWER3);
	mdelay(30);
	gpo_set(GPO_A716_LCD_POWER1);
	mdelay(30);
}

int lcd_power_off(void) {
	gpo_clear(GPO_A716_LCD_POWER1);
	mdelay(65);
	gpo_clear(GPO_A716_LCD_POWER3);
	gpo_clear(GPO_A716_LCD_ENABLE);
}

int backlight_power_on(void) {
	CKEN |= CKEN0_PWM0;
	PWM_PWDUTY0 = 255;
	PWM_PERVAL0 = 255;
	gpo_set(GPO_A716_BACKLIGHT);
}

int backlight_power_off(void) {
	PWM_PWDUTY0 = 0;
	PWM_PERVAL0 = 0;
	gpo_clear(GPO_A716_BACKLIGHT);
	CKEN &= ~CKEN0_PWM0;
	mdelay(30);
}

struct pxafb_dma_descriptor {
	unsigned int fdadr;
	unsigned int fsadr;
	unsigned int fidr;
	unsigned int ldcmd;
} __attribute__ ((aligned(16)));

int pxafb_disable(void) {
	LCCR0 &= ~(LCCR0_LDM);
	LCCR0 &= ~(LCCR0_ENB);
	LCCR0 = 0;
	LCCR1 = 0;
	LCCR2 = 0;
	LCCR3 = 0;
	LCSR = 0xffffffff;
	FDADR0 = 0;
}

int pxafb_enable(void) {
	struct pxafb_dma_descriptor *dma = (struct pxafb_dma_descriptor *)0xA3100000;
	unsigned int *fdadr0 = (unsigned int *)0xA3100100;

	CKEN &= ~CKEN16_LCD;
	CKEN |= CKEN16_LCD;

	dma->fdadr = (unsigned int)dma;
	dma->fsadr = (unsigned int)0xA3000000;
	dma->fidr = 0;
	dma->ldcmd = 153600;

	LCCR3 = (LCCR3_16BPP | LCCR3_HorSnchL | LCCR3_VrtSnchL | 7);
	LCCR2 = LCCR2_DisHght(320) + LCCR2_VrtSnchWdth(6) + LCCR2_BegFrmDel(4) + LCCR2_EndFrmDel(4);
	LCCR1 = LCCR1_DisWdth(240) + LCCR1_HorSnchWdth(64) + LCCR1_BegLnDel(11) + LCCR1_EndLnDel(11);
	LCCR0 = (LCCR0_PAS | LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM | LCCR0_QDM | LCCR0_BM | LCCR0_OUM);

	*fdadr0 = FDADR0;
	FDADR0 = dma->fdadr;
	FDADR1 = 0;
	LCCR0 |= LCCR0_ENB;
}