path: root/drivers/media/dvb/ttpci/av7110_hw.c

/*
 * av7110_hw.c: av7110 low level hardware access and firmware interface
 *
 * Copyright (C) 1999-2002 Ralph  Metzler
 *                       & Marcus Metzler for convergence integrated media GmbH
 *
 * originally based on code by:
 * Copyright (C) 1998,1999 Christian Theiss <mistert@rz.fh-augsburg.de>
 *
 * 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.
 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
 *
 * the project's page is at http://www.linuxtv.org/dvb/
 */

/* for debugging ARM communication: */
//#define COM_DEBUG

#include <stdarg.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/fs.h>

#include "av7110.h"
#include "av7110_hw.h"

#define _NOHANDSHAKE

/****************************************************************************
 * DEBI functions
 ****************************************************************************/

/* This DEBI code is based on the Stradis driver
   by Nathan Laredo <laredo@gnu.org> */

int av7110_debiwrite(struct av7110 *av7110, u32 config,
		     int addr, u32 val, int count)
{
	struct saa7146_dev *dev = av7110->dev;

	if (count <= 0 || count > 32764) {
		printk("%s: invalid count %d\n", __func__, count);
		return -1;
	}
	if (saa7146_wait_for_debi_done(av7110->dev, 0) < 0) {
		printk("%s: wait_for_debi_done failed\n", __func__);
		return -1;
	}
	saa7146_write(dev, DEBI_CONFIG, config);
	if (count <= 4)		/* immediate transfer */
		saa7146_write(dev, DEBI_AD, val);
	else			/* block transfer */
		saa7146_write(dev, DEBI_AD, av7110->debi_bus);
	saa7146_write(dev, DEBI_COMMAND, (count << 17) | (addr & 0xffff));
	saa7146_write(dev, MC2, (2 << 16) | 2);
	return 0;
}

u32 av7110_debiread(struct av7110 *av7110, u32 config, int addr, int count)
{
	struct saa7146_dev *dev = av7110->dev;
	u32 result = 0;

	if (count > 32764 || count <= 0) {
		printk("%s: invalid count %d\n", __func__, count);
		return 0;
	}
	if (saa7146_wait_for_debi_done(av7110->dev, 0) < 0) {
		printk("%s: wait_for_debi_done #1 failed\n", __func__);
		return 0;
	}
	saa7146_write(dev, DEBI_AD, av7110->debi_bus);
	saa7146_write(dev, DEBI_COMMAND, (count << 17) | 0x10000 | (addr & 0xffff));

	saa7146_write(dev, DEBI_CONFIG, config);
	saa7146_write(dev, MC2, (2 << 16) | 2);
	if (count > 4)
		return