root/sound/soc/at91/at91-pcm.h

INCLUDED FROM

/*
 * at91-pcm.h - ALSA PCM interface for the Atmel AT91 SoC
 *
 * Author:      Frank Mandarino <fmandarino@endrelia.com>
 *              Endrelia Technologies Inc.
 * Created:     Mar 3, 2006
 *
 * Based on pxa2xx-pcm.h by:
 *
 * Author:      Nicolas Pitre
 * Created:     Nov 30, 2004
 * Copyright:   MontaVista Software, Inc.
 *
 * 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.
 */

#ifndef _AT91_PCM_H
#define _AT91_PCM_H

#include <mach/hardware.h>

struct at91_ssc_periph {
        void __iomem    *base;
        u32             pid;
};

/*
 * Registers and status bits that are required by the PCM driver.
 */
struct at91_pdc_regs {
        unsigned int    xpr;            /* PDC recv/trans pointer */
        unsigned int    xcr;            /* PDC recv/trans counter */
        unsigned int    xnpr;           /* PDC next recv/trans pointer */
        unsigned int    xncr;           /* PDC next recv/trans counter */
        unsigned int    ptcr;           /* PDC transfer control */
};

struct at91_ssc_mask {
        u32     ssc_enable;             /* SSC recv/trans enable */
        u32     ssc_disable;            /* SSC recv/trans disable */
        u32     ssc_endx;               /* SSC ENDTX or ENDRX */
        u32     ssc_endbuf;             /* SSC TXBUFE or RXBUFF */
        u32     pdc_enable;             /* PDC recv/trans enable */
        u32     pdc_disable;            /* PDC recv/trans disable */
};

/*
 * This structure, shared between the PCM driver and the interface,
 * contains all information required by the PCM driver to perform the
 * PDC DMA operation.  All fields except dma_intr_handler() are initialized
 * by the interface.  The dms_intr_handler() pointer is set by the PCM
 * driver and called by the interface SSC interrupt handler if it is
 * non-NULL.
 */
struct at91_pcm_dma_params {
        char *name;                     /* stream identifier */
        int pdc_xfer_size;              /* PDC counter increment in bytes */
        void __iomem *ssc_base;         /* SSC base address */
        struct at91_pdc_regs *pdc; /* PDC receive or transmit registers */
        struct at91_ssc_mask *mask;/* SSC & PDC status bits */
        struct snd_pcm_substream *substream;
        void (*dma_intr_handler)(u32, struct snd_pcm_substream *);
};

extern struct snd_soc_platform at91_soc_platform;

#define at91_ssc_read(a)        ((unsigned long) __raw_readl(a))
#define at91_ssc_write(a,v)     __raw_writel((v),(a))

#endif /* _AT91_PCM_H */