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
  24 struct 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  */
  32 struct 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
  40 struct 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  */
  57 struct 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
  67 extern 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 */