path: root/sound/soc/blackfin/bf5xx-sport.c

/*
 * File:         bf5xx_sport.c
 * Based on:
 * Author:       Roy Huang <roy.huang@analog.com>
 *
 * Created:      Tue Sep 21 10:52:42 CEST 2004
 * Description:
 *               Blackfin SPORT Driver
 *
 *               Copyright 2004-2007 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/gpio.h>
#include <linux/bug.h>
#include <asm/portmux.h>
#include <asm/dma.h>
#include <asm/blackfin.h>
#include <asm/cacheflush.h>

#include "bf5xx-sport.h"
/* delay between frame sync pulse and first data bit in multichannel mode */
#define FRAME_DELAY (1<<12)

struct sport_device *sport_handle;
EXPORT_SYMBOL(sport_handle);
/* note: multichannel is in units of 8 channels,
 * tdm_count is # channels NOT / 8 ! */
int sport_set_multichannel(struct sport_device *sport,
		int tdm_count, u32 mask, int packed)
{
	pr_debug("%s tdm_count=%d mask:0x%08x packed=%d\n", __func__,
			tdm_count, mask, packed);

	if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
		return -EBUSY;

	if (tdm_count & 0x7)
		return -EINVAL;

	if (tdm_count > 32)
		return -EINVAL; /* Only support less than 32 channels now */

	if (tdm_count) {
		sport->regs->mcmc1 = ((tdm_count>>3)-1) << 12;
		sport->regs->mcmc2 = FRAME_DELAY | MCMEN | \
				(packed ? (MCDTXPE|MCDRXPE) : 0);

		sport->regs->mtcs0 = mask;
		sport->regs->mrcs0 = mask;
		sport->regs->mtcs1 = 0;
		sport->regs->mrcs1 = 0;
		sport->regs->mtcs2 = 0;
		sport->regs->mrcs2 = 0;
		sport->regs->mtcs3 = 0;
		sport->regs->mrcs3 = 0;
	} else {
		sport->regs->mcmc1 = 0;
		sport->regs->mcmc2 = 0;

		sport->regs->mtcs0 = 0;
		sport->regs->mrcs0 = 0;
	}

	sport->regs->mtcs1 = 0; sport->regs->mtcs2 = 0; sport->regs->mtcs3 = 0;
	sport->regs->mrcs1 = 0; sport->regs->mrcs2 = 0; sport->regs->mrcs3 = 0;

	SSYNC();

	return 0;
}
EXPORT_SYMBOL(sport_set_multichannel);

int sport_config_rx(struct sport_device *sport, unsigned int rcr1,
		unsigned int rcr2, unsigned int clkdiv, unsigned int fsdiv)
{
	if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
		return -EBUSY;

	sport->regs->rcr1 = rcr1;
	sport->regs->rcr2 = rcr2;
	sport->regs->rclkdiv = clkdiv;
	sport->regs->rfsdiv = fsdiv;

	SSYNC();

	return 0;
}
EXPORT_SYMBOL(sport_config_rx);

int sport_config_tx(struct sport_device *sport, unsigned int tcr1,
		unsigned int tcr2, unsigned int clkdiv, unsigned int fsdiv)
{
	if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
		return -EBUSY;

	sport->regs->tcr1 = tcr1;
	sport->regs->tcr2 = tcr2;
	sport->regs->tclkdiv = clkdiv;
	sport->regs->tfsdiv = fsdiv;

	SSYNC();

	return 0;
}
EXPORT_SYMBOL(sport_config_tx);

static void setup_desc(struct dmasg *desc, void *buf, int fragcount,
		size_t fragsize, unsigned int cfg,
		unsigned int x_count, unsigned int ycount, size_t wdsize)
{

	int i;

	for (