sound/soc/at91/at91rm9200-pcm.h

   1 /*
   2  * at91rm9200-pcm.h - ALSA PCM interface for the Atmel AT91RM9200 chip
   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 /*
  20  * Registers and status bits that are required by the PCM driver.
  21  */
  22 struct at91rm9200_ssc_regs {
  23         void __iomem    *cr;            /* SSC control */
  24         void __iomem    *ier;           /* SSC interrupt enable */
  25         void __iomem    *idr;           /* SSC interrupt disable */
  26 };
  27
  28 struct at91rm9200_pdc_regs {
  29         void __iomem    *xpr;           /* PDC recv/trans pointer */
  30         void __iomem    *xcr;           /* PDC recv/trans counter */
  31         void __iomem    *xnpr;          /* PDC next recv/trans pointer */
  32         void __iomem    *xncr;          /* PDC next recv/trans counter */
  33         void __iomem    *ptcr;          /* PDC transfer control */
  34 };
  35
  36 struct at91rm9200_ssc_mask {
  37         u32     ssc_enable;             /* SSC recv/trans enable */
  38         u32     ssc_disable;            /* SSC recv/trans disable */
  39         u32     ssc_endx;               /* SSC ENDTX or ENDRX */
  40         u32     ssc_endbuf;             /* SSC TXBUFE or RXBUFF */
  41         u32     pdc_enable;             /* PDC recv/trans enable */
  42         u32     pdc_disable;            /* PDC recv/trans disable */
  43 };
  44
  45
  46 /*
  47  * This structure, shared between the PCM driver and the interface,
  48  * contains all information required by the PCM driver to perform the
  49  * PDC DMA operation.  All fields except dma_intr_handler() are initialized
  50  * by the interface.  The dms_intr_handler() pointer is set by the PCM
  51  * driver and called by the interface SSC interrupt handler if it is
  52  * non-NULL.
  53  */
  54 typedef struct {
  55         char *name;                     /* stream identifier */
  56         int pdc_xfer_size;              /* PDC counter increment in bytes */
  57         struct at91rm9200_ssc_regs *ssc; /* SSC register addresses */
  58         struct at91rm9200_pdc_regs *pdc; /* PDC receive/transmit registers */
  59         struct at91rm9200_ssc_mask *mask;/* SSC & PDC status bits */
  60         snd_pcm_substream_t *substream;
  61         void (*dma_intr_handler)(u32, snd_pcm_substream_t *);
  62 } at91rm9200_pcm_dma_params_t;
  63
  64 extern struct snd_soc_cpu_dai at91rm9200_i2s_dai[3];
  65 extern struct snd_soc_platform at91rm9200_soc_platform;
  66
  67
  68 /*
  69  * SSC I/O helpers.
  70  * E.g., at91_ssc_write(AT91_SSC(1) + AT91_SSC_CR, AT91_SSC_RXEN);
  71  */
  72 #define AT91_SSC(x) (((x)==0) ? AT91_VA_BASE_SSC0 :\
  73          ((x)==1) ? AT91_VA_BASE_SSC1 : ((x)==2) ? AT91_VA_BASE_SSC2 : NULL)
  74 #define at91_ssc_read(a)        ((unsigned long) __raw_readl(a))
  75 #define at91_ssc_write(a,v)     __raw_writel((v),(a))