/*
* PMac DBDMA lowlevel functions
*
* Copyright (c) by Takashi Iwai <tiwai@suse.de>
* code based on dmasound.c.
*
* 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 <asm/io.h>
#include <asm/irq.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <sound/core.h>
#include "pmac.h"
#include <sound/pcm_params.h>
#include <asm/pmac_feature.h>
#include <asm/pci-bridge.h>
/* fixed frequency table for awacs, screamer, burgundy, DACA (44100 max) */
static int awacs_freqs[8] = {
44100, 29400, 22050, 17640, 14700, 11025, 8820, 7350
};
/* fixed frequency table for tumbler */
static int tumbler_freqs[1] = {
44100
};
/*
* we will allocate a single 'emergency' dbdma cmd block to use if the
* tx status comes up "DEAD". This happens on some PowerComputing Pmac
* clones, either owing to a bug in dbdma or some interaction between
* IDE and sound. However, this measure would deal with DEAD status if
* it appeared elsewhere.
*/
static struct pmac_dbdma emergency_dbdma;
static int emergency_in_use;
/*
* allocate DBDMA command arrays
*/
static int snd_pmac_dbdma_alloc(struct snd_pmac *chip, struct pmac_dbdma *rec, int size)
{
unsigned int rsize = sizeof(struct dbdma_cmd) * (size + 1);
rec->space = dma_alloc_coherent(&chip->pdev->dev, rsize,
&rec->dma_base, GFP_KERNEL);
if (rec->space == NULL)
return -ENOMEM;
rec->size = size;
memset