LXR linux/sound/soc/at91/at91-pcm.h

   1/*
   2 * at91-pcm.h - ALSA PCM interface for the Atmel AT91 SoC
   3 *
   4 * Author:      Frank Mandarino <fmandarino@endrelia.com>
   5 *              Endrelia Technologies Inc.
   6 * Created:     Mar 3, 2006
   7 *
   8 * Based on pxa2xx-pcm.h by:
   9 *
  10 * Author:      Nicolas Pitre
  11 * Created:     Nov 30, 2004
  12 * Copyright:   MontaVista Software, Inc.
  13 *
  14 * This program is free software; you can redistribute it and/or modify
  15 * it under the terms of the GNU General Public License version 2 as
  16 * published by the Free Software Foundation.
  17 */
  18
  19#ifndef _AT91_PCM_H
  20#define _AT91_PCM_H
  21
  22#include <asm/arch/hardware.h>
  23
  24struct at91_ssc_periph {
  25        void __iomem    *base;
  26        u32             pid;
  27};
  28
  29/*
  30 * Registers and status bits that are required by the PCM driver.
  31 */
  32struct at91_pdc_regs {
  33        unsigned int    xpr;            /* PDC recv/trans pointer */
  34        unsigned int    xcr;            /* PDC recv/trans counter */
  35        unsigned int    xnpr;           /* PDC next recv/trans pointer */
  36        unsigned int    xncr;           /* PDC next recv/trans counter */
  37        unsigned int    ptcr;           /* PDC transfer control */
  38};
  39
  40struct at91_ssc_mask {
  41        u32     ssc_enable;             /* SSC recv/trans enable */
  42        u32     ssc_disable;            /* SSC recv/trans disable */
  43        u32     ssc_endx;               /* SSC ENDTX or ENDRX */
  44        u32     ssc_endbuf;             /* SSC TXBUFE or RXBUFF */
  45        u32     pdc_enable;             /* PDC recv/trans enable */
  46        u32     pdc_disable;            /* PDC recv/trans disable */
  47};
  48
  49/*
  50 * This structure, shared between the PCM driver and the interface,
  51 * contains all information required by the PCM driver to perform the
  52 * PDC DMA operation.  All fields except dma_intr_handler() are initialized
  53 * by the interface.  The dms_intr_handler() pointer is set by the PCM
  54 * driver and called by the interface SSC interrupt handler if it is
  55 * non-NULL.
  56 */
  57struct at91_pcm_dma_params {
  58        char *name;                     /* stream identifier */
  59        int pdc_xfer_size;              /* PDC counter increment in bytes */
  60        void __iomem *ssc_base;         /* SSC base address */
  61        struct at91_pdc_regs *pdc; /* PDC receive or transmit registers */
  62        struct at91_ssc_mask *mask;/* SSC & PDC status bits */
  63        struct snd_pcm_substream *substream;
  64        void (*dma_intr_handler)(u32, struct snd_pcm_substream *);
  65};
  66
  67extern struct snd_soc_platform at91_soc_platform;
  68
  69#define at91_ssc_read(a)        ((unsigned long) __raw_readl(a))
  70#define at91_ssc_write(a,v)     __raw_writel((v),(a))
  71
  72#endif /* _AT91_PCM_H */
  73