amd7930.c

linux 内核源代码

/*
 * Driver for AMD7930 sound chips found on Sparcs.
 * Copyright (C) 2002 David S. Miller <[e-mail]>
 *
 * Based entirely upon drivers/sbus/audio/amd7930.c which is:
 * Copyright (C) 1996,1997 Thomas K. Dyas ([e-mail])
 *
 * --- 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 <sound/driver.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/info.h>
#include <sound/control.h>
#include <sound/initval.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/sbus.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 int 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;
	__u8	mmr2;
};

/* After an amd7930 interrupt, reading the Interrupt Register (ir)
 * clears the interrupt and returns a bitmask indicating which
 * interrupt source(s) require service.
 */

#define AMR_IR_DTTHRSH			0x01 /* D-channel xmit threshold */
#define AMR_IR_DRTHRSH			0x02 /* D-channel recv threshold */
#define AMR_IR_DSRI			0x04 /* D-channel packet status */
#define AMR_IR_DERI			0x08 /* D-channel error */
#define AMR_IR_BBUF			0x10 /* B-channel data xfer */
#define AMR_IR_LSRI			0x20 /* LIU status */
#define AMR_IR_DSR2I			0x40 /* D-channel buffer status */
#define AMR_IR_MLTFRMI			0x80 /* multiframe or PP */

/* The amd7930 has "indirect registers" which are accessed by writing
 * the register number into the Command Register and then reading or
 * writing values from the Data Register as appropriate. We define the
 * AMR_* macros to be the indirect register numbers and AM_* macros to
 * be bits in whatever register is referred to.
 */

/* Initialization */
#define	AMR_INIT			0x21
#define		AM_INIT_ACTIVE			0x01
#define		AM_INIT_DATAONLY		0x02
#define		AM_INIT_POWERDOWN		0x03
#define		AM_INIT_DISABLE_INTS		0x04
#define AMR_INIT2			0x20
#define		AM_INIT2_ENABLE_POWERDOWN	0x20
#define		AM_INIT2_ENABLE_MULTIFRAME	0x10

/* Line Interface Unit */
#define	AMR_LIU_LSR			0xA1
#define		AM_LIU_LSR_STATE		0x07
#define		AM_LIU_LSR_F3			0x08
#define		AM_LIU_LSR_F7			0x10
#define		AM_LIU_LSR_F8			0x20
#define		AM_LIU_LSR_HSW			0x40
#define		AM_LIU_LSR_HSW_CHG		0x80
#define	AMR_LIU_LPR			0xA2
#define	AMR_LIU_LMR1			0xA3
#define		AM_LIU_LMR1_B1_ENABL		0x01
#define		AM_LIU_LMR1_B2_ENABL		0x02
#define		AM_LIU_LMR1_F_DISABL		0x04
#define		AM_LIU_LMR1_FA_DISABL		0x08
#define		AM_LIU_LMR1_REQ_ACTIV		0x10
#define		AM_LIU_LMR1_F8_F3		0x20
#define		AM_LIU_LMR1_LIU_ENABL		0x40
#define	AMR_LIU_LMR2			0xA4
#define		AM_LIU_LMR2_DECHO		0x01
#define		AM_LIU_LMR2_DLOOP		0x02
#define		AM_LIU_LMR2_DBACKOFF		0x04
#define		AM_LIU_LMR2_EN_F3_INT		0x08
#define		AM_LIU_LMR2_EN_F8_INT		0x10
#define		AM_LIU_LMR2_EN_HSW_INT		0x20
#define		AM_LIU_LMR2_EN_F7_INT		0x40
#define	AMR_LIU_2_4			0xA5
#define	AMR_LIU_MF			0xA6
#define	AMR_LIU_MFSB			0xA7
#define	AMR_LIU_MFQB			0xA8

/* Multiplexor */
#define	AMR_MUX_MCR1			0x41
#define	AMR_MUX_MCR2			0x42
#define	AMR_MUX_MCR3			0x43
#define		AM_MUX_CHANNEL_B1		0x01
#define		AM_MUX_CHANNEL_B2		0x02
#define		AM_MUX_CHANNEL_Ba		0x03
#define		AM_MUX_CHANNEL_Bb		0x04
#define		AM_MUX_CHANNEL_Bc		0x05
#define		AM_MUX_CHANNEL_Bd		0x06
#define		AM_MUX_CHANNEL_Be		0x07
#define		AM_MUX_CHANNEL_Bf		0x08
#define	AMR_MUX_MCR4			0x44
#define		AM_MUX_MCR4_ENABLE_INTS		0x08
#define		AM_MUX_MCR4_REVERSE_Bb		0x10
#define		AM_MUX_MCR4_REVERSE_Bc		0x20
#define	AMR_MUX_1_4			0x45

/* Main Audio Processor */
#define	AMR_MAP_X			0x61
#define	AMR_MAP_R			0x62
#define	AMR_MAP_GX			0x63
#define	AMR_MAP_GR			0x64
#define	AMR_MAP_GER			0x65
#define	AMR_MAP_STGR			0x66
#define	AMR_MAP_FTGR_1_2		0x67
#define	AMR_MAP_ATGR_1_2		0x68
#define	AMR_MAP_MMR1			0x69
#define		AM_MAP_MMR1_ALAW		0x01
#define		AM_MAP_MMR1_GX			0x02
#define		AM_MAP_MMR1_GR			0x04
#define		AM_MAP_MMR1_GER			0x08
#define		AM_MAP_MMR1_X			0x10
#define		AM_MAP_MMR1_R			0x20
#define		AM_MAP_MMR1_STG			0x40
#define		AM_MAP_MMR1_LOOPBACK		0x80
#define	AMR_MAP_MMR2			0x6A
#define		AM_MAP_MMR2_AINB		0x01
#define		AM_MAP_MMR2_LS			0x02
#define		AM_MAP_MMR2_ENABLE_DTMF		0x04
#define		AM_MAP_MMR2_ENABLE_TONEGEN	0x08
#define		AM_MAP_MMR2_ENABLE_TONERING	0x10
#define		AM_MAP_MMR2_DISABLE_HIGHPASS	0x20
#define		AM_MAP_MMR2_DISABLE_AUTOZERO	0x40
#define	AMR_MAP_1_10			0x6B
#define	AMR_MAP_MMR3			0x6C
#define	AMR_MAP_STRA			0x6D
#define	AMR_MAP_STRF			0x6E
#define	AMR_MAP_PEAKX			0x70
#define	AMR_MAP_PEAKR			0x71
#define	AMR_MAP_15_16			0x72

/* Data Link Controller */
#define	AMR_DLC_FRAR_1_2_3		0x81
#define	AMR_DLC_SRAR_1_2_3		0x82
#define	AMR_DLC_TAR			0x83
#define	AMR_DLC_DRLR			0x84
#define	AMR_DLC_DTCR			0x85
#define	AMR_DLC_DMR1			0x86
#define		AMR_DLC_DMR1_DTTHRSH_INT	0x01
#define		AMR_DLC_DMR1_DRTHRSH_INT	0x02
#define		AMR_DLC_DMR1_TAR_ENABL		0x04
#define		AMR_DLC_DMR1_EORP_INT		0x08
#define		AMR_DLC_DMR1_EN_ADDR1		0x10
#define		AMR_DLC_DMR1_EN_ADDR2		0x20
#define		AMR_DLC_DMR1_EN_ADDR3		0x40
#define		AMR_DLC_DMR1_EN_ADDR4		0x80
#define		AMR_DLC_DMR1_EN_ADDRS		0xf0
#define	AMR_DLC_DMR2			0x87
#define		AMR_DLC_DMR2_RABRT_INT		0x01
#define		AMR_DLC_DMR2_RESID_INT		0x02
#define		AMR_DLC_DMR2_COLL_INT		0x04
#define		AMR_DLC_DMR2_FCS_INT		0x08
#define		AMR_DLC_DMR2_OVFL_INT		0x10
#define		AMR_DLC_DMR2_UNFL_INT		0x20
#define		AMR_DLC_DMR2_OVRN_INT		0x40
#define		AMR_DLC_DMR2_UNRN_INT		0x80
#define	AMR_DLC_1_7			0x88
#define	AMR_DLC_DRCR			0x89
#define	AMR_DLC_RNGR1			0x8A
#define	AMR_DLC_RNGR2			0x8B
#define	AMR_DLC_FRAR4			0x8C
#define	AMR_DLC_SRAR4			0x8D
#define	AMR_DLC_DMR3			0x8E
#define		AMR_DLC_DMR3_VA_INT		0x01
#define		AMR_DLC_DMR3_EOTP_INT		0x02
#define		AMR_DLC_DMR3_LBRP_INT		0x04
#define		AMR_DLC_DMR3_RBA_INT		0x08
#define		AMR_DLC_DMR3_LBT_INT		0x10
#define		AMR_DLC_DMR3_TBE_INT		0x20
#define		AMR_DLC_DMR3_RPLOST_INT		0x40
#define		AMR_DLC_DMR3_KEEP_FCS		0x80
#define	AMR_DLC_DMR4			0x8F
#define		AMR_DLC_DMR4_RCV_1		0x00
#define		AMR_DLC_DMR4_RCV_2		0x01
#define		AMR_DLC_DMR4_RCV_4		0x02
#define		AMR_DLC_DMR4_RCV_8		0x03
#define		AMR_DLC_DMR4_RCV_16		0x01
#define		AMR_DLC_DMR4_RCV_24		0x02
#define		AMR_DLC_DMR4_RCV_30		0x03
#define		AMR_DLC_DMR4_XMT_1		0x00
#define		AMR_DLC_DMR4_XMT_2		0x04
#define		AMR_DLC_DMR4_XMT_4		0x08
#define		AMR_DLC_DMR4_XMT_8		0x0c
#define		AMR_DLC_DMR4_XMT_10		0x08
#define		AMR_DLC_DMR4_XMT_14		0x0c
#define		AMR_DLC_DMR4_IDLE_MARK		0x00
#define		AMR_DLC_DMR4_IDLE_FLAG		0x10
#define		AMR_DLC_DMR4_ADDR_BOTH		0x00
#define		AMR_DLC_DMR4_ADDR_1ST		0x20
#define		AMR_DLC_DMR4_ADDR_2ND		0xa0
#define		AMR_DLC_DMR4_CR_ENABLE		0x40
#define	AMR_DLC_12_15			0x90
#define	AMR_DLC_ASR			0x91
#define	AMR_DLC_EFCR			0x92
#define		AMR_DLC_EFCR_EXTEND_FIFO	0x01
#define		AMR_DLC_EFCR_SEC_PKT_INT	0x02

#define AMR_DSR1_VADDR			0x01
#define AMR_DSR1_EORP			0x02
#define AMR_DSR1_PKT_IP			0x04
#define AMR_DSR1_DECHO_ON		0x08
#define AMR_DSR1_DLOOP_ON		0x10
#define AMR_DSR1_DBACK_OFF		0x20
#define AMR_DSR1_EOTP			0x40
#define AMR_DSR1_CXMT_ABRT		0x80

#define AMR_DSR2_LBRP			0x01
#define AMR_DSR2_RBA			0x02
#define AMR_DSR2_RPLOST			0x04
#define AMR_DSR2_LAST_BYTE		0x08
#define AMR_DSR2_TBE			0x10
#define AMR_DSR2_MARK_IDLE		0x20
#define AMR_DSR2_FLAG_IDLE		0x40
#define AMR_DSR2_SECOND_PKT		0x80

#define AMR_DER_RABRT			0x01
#define AMR_DER_RFRAME			0x02
#define AMR_DER_COLLISION		0x04
#define AMR_DER_FCS			0x08
#define AMR_DER_OVFL			0x10
#define AMR_DER_UNFL			0x20
#define AMR_DER_OVRN			0x40
#define AMR_DER_UNRN			0x80

/* Peripheral Port */
#define	AMR_PP_PPCR1			0xC0
#define	AMR_PP_PPSR			0xC1
#define	AMR_PP_PPIER			0xC2
#define	AMR_PP_MTDR			0xC3
#define	AMR_PP_MRDR			0xC3
#define	AMR_PP_CITDR0			0xC4
#define	AMR_PP_CIRDR0			0xC4
#define	AMR_PP_CITDR1			0xC5
#define	AMR_PP_CIRDR1			0xC5
#define	AMR_PP_PPCR2			0xC8
#define	AMR_PP_PPCR3			0xC9

struct snd_amd7930 {
	spinlock_t		lock;
	void __iomem		*regs;
	u32			flags;
#define AMD7930_FLAG_PLAYBACK	0x00000001
#define AMD7930_FLAG_CAPTURE	0x00000002

	struct amd7930_map	map;

	struct snd_card		*card;
	struct snd_pcm		*pcm;
	struct snd_pcm_substream	*playback_substream;
	struct snd_pcm_substream	*capture_substream;

	/* Playback/Capture buffer state. */
	unsigned char		*p_orig, *p_cur;
	int			p_left;
	unsigned char		*c_orig, *c_cur;
	int			c_left;

	int			rgain;
	int			pgain;
	int			mgain;

	unsigned int		irq;
	unsigned int		regs_size;
	struct snd_amd7930	*next;
};

static struct snd_amd7930 *amd7930_list;

/* Idle the AMD7930 chip.  The amd->lock is not held.  */
static __inline__ void amd7930_idle(struct snd_amd7930 *amd)
{
	unsigned long flags;

	spin_lock_irqsave(&amd->lock, flags);
	sbus_writeb(AMR_INIT, amd->regs + AMD7930_CR);
	sbus_writeb(0, amd->regs + AMD7930_DR);
	spin_unlock_irqrestore(&amd->lock, flags);
}

/* Enable chip interrupts.  The amd->lock is not held.  */
static __inline__ void amd7930_enable_ints(struct snd_amd7930 *amd)
{
	unsigned long flags;

	spin_lock_irqsave(&amd->lock, flags);
	sbus_writeb(AMR_INIT, amd->regs + AMD7930_CR);
	sbus_writeb(AM_INIT_ACTIVE, amd->regs + AMD7930_DR);
	spin_unlock_irqrestore(&amd->lock, flags);
}

/* Disable chip interrupts.  The amd->lock is not held.  */
static __inline__ void amd7930_disable_ints(struct snd_amd7930 *amd)
{
	unsigned long flags;

	spin_lock_irqsave(&amd->lock, flags);
	sbus_writeb(AMR_INIT, amd->regs + AMD7930_CR);
	sbus_writeb(AM_INIT_ACTIVE | AM_INIT_DISABLE_INTS, amd->regs + AMD7930_DR);
	spin_unlock_irqrestore(&amd->lock, flags);
}

/* Commit amd7930_map settings to the hardware.
 * The amd->lock is held and local interrupts are disabled.
 */
static void __amd7930_write_map(struct snd_amd7930 *amd)
{
	struct amd7930_map *map = &amd->map;