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/*
* 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 */
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