linux-imx

/*

 * Driver for AMD7930 sound chips found on Sparcs.

 * Copyright (C) 2002, 2008 David S. Miller <davem@davemloft.net>

 *

 * Based entirely upon drivers/sbus/audio/amd7930.c which is:

 * Copyright (C) 1996,1997 Thomas K. Dyas (tdyas@eden.rutgers.edu)

 *

 * --- Notes from Thomas's original driver ---

 * This is the lowlevel driver for the AMD7930 audio chip found on all

 * sun4c machines and some sun4m machines.

 *

 * The amd7930 is actually an ISDN chip which has a very simple

 * integrated audio encoder/decoder. When Sun decided on what chip to

 * use for audio, they had the brilliant idea of using the amd7930 and

 * only connecting the audio encoder/decoder pins.

 *

 * Thanks to the AMD engineer who was able to get us the AMD79C30

 * databook which has all the programming information and gain tables.

 *

 * Advanced Micro Devices' Am79C30A is an ISDN/audio chip used in the

 * SparcStation 1+.  The chip provides microphone and speaker interfaces

 * which provide mono-channel audio at 8K samples per second via either

 * 8-bit A-law or 8-bit mu-law encoding.  Also, the chip features an

 * ISDN BRI Line Interface Unit (LIU), I.430 S/T physical interface,

 * which performs basic D channel LAPD processing and provides raw

 * B channel data.  The digital audio channel, the two ISDN B channels,

 * and two 64 Kbps channels to the microprocessor are all interconnected

 * via a multiplexer.

 * --- End of notes from Thoamas's original driver ---

 */

​

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/moduleparam.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/io.h>

​

#include <sound/core.h>

#include <sound/pcm.h>

#include <sound/info.h>

#include <sound/control.h>

#include <sound/initval.h>

​

#include <asm/irq.h>

#include <asm/prom.h>

​

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;  /* Index 0-MAX */

static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;   /* ID for this card */

static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; /* Enable this card */

​

module_param_array(index, int, NULL, 0444);

MODULE_PARM_DESC(index, "Index value for Sun AMD7930 soundcard.");

module_param_array(id, charp, NULL, 0444);

MODULE_PARM_DESC(id, "ID string for Sun AMD7930 soundcard.");

module_param_array(enable, bool, NULL, 0444);

MODULE_PARM_DESC(enable, "Enable Sun AMD7930 soundcard.");

MODULE_AUTHOR("Thomas K. Dyas and David S. Miller");

MODULE_DESCRIPTION("Sun AMD7930");

MODULE_LICENSE("GPL");

MODULE_SUPPORTED_DEVICE("{{Sun,AMD7930}}");

​

/* Device register layout.  */

​

/* Register interface presented to the CPU by the amd7930. */

#define AMD7930_CR  0x00UL      /* Command Register (W) */

#define AMD7930_IR  AMD7930_CR  /* Interrupt Register (R) */

#define AMD7930_DR  0x01UL      /* Data Register (R/W) */

#define AMD7930_DSR1    0x02UL      /* D-channel Status Register 1 (R) */

#define AMD7930_DER 0x03UL      /* D-channel Error Register (R) */

#define AMD7930_DCTB    0x04UL      /* D-channel Transmit Buffer (W) */

#define AMD7930_DCRB    AMD7930_DCTB    /* D-channel Receive Buffer (R) */

#define AMD7930_BBTB    0x05UL      /* Bb-channel Transmit Buffer (W) */

#define AMD7930_BBRB    AMD7930_BBTB    /* Bb-channel Receive Buffer (R) */

#define AMD7930_BCTB    0x06UL      /* Bc-channel Transmit Buffer (W) */

#define AMD7930_BCRB    AMD7930_BCTB    /* Bc-channel Receive Buffer (R) */

#define AMD7930_DSR2    0x07UL      /* D-channel Status Register 2 (R) */

​

/* Indirect registers in the Main Audio Processor. */

struct amd7930_map {

    __u16   x[8];

    __u16   r[8];

    __u16   gx;

    __u16   gr;

    __u16   ger;

    __u16   stgr;

    __u16   ftgr;

    __u16   atgr;

    __u8    mmr1;