path: root/sound/mips/hal2.c

/*
 *  Driver for A2 audio system used in SGI machines
 *  Copyright (c) 2008 Thomas Bogendoerfer <tsbogend@alpha.fanken.de>
 *
 *  Based on OSS code from Ladislav Michl <ladis@linux-mips.org>, which
 *  was based on code from Ulf Carlsson
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>

#include <asm/sgi/hpc3.h>
#include <asm/sgi/ip22.h>

#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/pcm-indirect.h>
#include <sound/initval.h>

#include "hal2.h"

static int index = SNDRV_DEFAULT_IDX1;  /* Index 0-MAX */
static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */

module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for SGI HAL2 soundcard.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for SGI HAL2 soundcard.");
MODULE_DESCRIPTION("ALSA driver for SGI HAL2 audio");
MODULE_AUTHOR("Thomas Bogendoerfer");
MODULE_LICENSE("GPL");


#define H2_BLOCK_SIZE	1024
#define H2_BUF_SIZE	16384

struct hal2_pbus {
	struct hpc3_pbus_dmacregs *pbus;
	int pbusnr;
	unsigned int ctrl;		/* Current state of pbus->pbdma_ctrl */
};

struct hal2_desc {
	struct hpc_dma_desc desc;
	u32 pad;			/* padding */
};

struct hal2_codec {
	struct snd_pcm_indirect pcm_indirect;
	struct snd_pcm_substream *substream;

	unsigned char *buffer;
	dma_addr_t buffer_dma;
	struct hal2_desc *desc;
	dma_addr_t desc_dma;
	int desc_count;
	struct hal2_pbus pbus;
	int voices;			/* mono/stereo */
	unsigned int sample_rate;
	unsigned int master;		/* Master frequency */
	unsigned short mod;		/* MOD value */
	unsigned short inc;		/* INC value */
};

#define H2_MIX_OUTPUT_ATT	0
#define H2_MIX_INPUT_GAIN	1

struct snd_hal2 {
	struct snd_card *card;

	struct hal2_ctl_regs *ctl_regs;	/* HAL2 ctl registers */
	struct hal2_aes_regs *aes_regs;	/* HAL2 aes registers */
	struct hal2_vol_regs *vol_regs;	/* HAL2 vol registers */
	struct hal2_syn_regs *syn_regs;	/* HAL2 syn registers */

	struct hal2_codec dac;
	struct hal2_codec adc;
};

#define H2_INDIRECT_WAIT(regs)	while (hal2_read(&regs->isr) & H2_ISR_TSTATUS);

#define H2_READ_ADDR(addr)	(addr | (1<<7))
#define H2_WRITE_ADDR(addr)	(addr)

static inline u32 hal2_read(u32 *reg)
{
	return __raw_readl(reg);
}

static inline void hal2_write(u32 val, u32 *reg)
{
	__raw_writel(val, reg);
}


static u32 hal2_i_read32(struct snd_hal2 *hal2, u16 addr)
{
	u32 ret;
	struct hal2_ctl_regs *regs = hal2->ctl_regs;

	hal2_write(H2_READ_ADDR(addr), &regs->iar);
	H2_INDIRECT_WAIT(regs);
	ret = hal2_read(&regs->idr0) & 0xffff;
	hal2_write(H2_READ_ADDR(addr) | 0x1, &regs->iar);
	H2_INDIRECT_WAIT(regs);
	ret |= (hal2_read(&regs->idr0) & 0xffff) << 16;
	return ret;
}

static void hal2_i_write16(struct snd_hal2 *hal2, u16 addr, u16 val)
{
	struct hal2_ctl_regs *regs = hal2->ctl_regs;

	hal2_write(val, &regs->idr0);
	hal2_write(0, &regs->idr1);
	hal2_write(0, &regs->idr2);
	hal2_write(0, &regs->idr3);
	hal2_write(H2_WRITE_ADDR(addr), &regs->iar);
	H2_INDIRECT_WAIT(regs);
}

static void hal2_i_write32(struct snd_hal2 *hal2, u16 addr, u32 val)
{
	struct hal2_ctl_regs *regs = hal2->ctl_regs;

	hal2_write(val & 0xffff, &regs->idr0);
	hal2_write(val >> 16, &regs->idr1);
	hal2_write(0, &regs->idr2);
	hal2_write(0, &regs->idr3);
	hal2_write(H2_WRITE_ADDR(addr), &regs->iar);
	H2_INDIRECT_WAIT(regs);
}

static void hal2_i_setbit16(struct snd_hal2 *hal2, u16 addr, u16 bit)
{
	struct hal2_ctl_regs *regs = hal2->ctl_regs;

	hal2_write(H2_READ_ADDR(addr), &regs->iar);
	H2_INDIRECT_WAIT(regs);
	hal2_write((hal2_read(&regs->idr0) & 0xffff) | bit, &regs->idr0);
	hal2_write(0, &regs->idr1);
	hal2_write(0, &regs->idr2);
	hal2_write(0, &regs->idr3);
	hal2_write(H2_WRITE_ADDR(addr), &regs->iar);