73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/*
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* at91-pcm.h - ALSA PCM interface for the Atmel AT91 SoC
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*
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* Author: Frank Mandarino <fmandarino@endrelia.com>
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* Endrelia Technologies Inc.
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* Created: Mar 3, 2006
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*
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* Based on pxa2xx-pcm.h by:
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*
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* Author: Nicolas Pitre
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* Created: Nov 30, 2004
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* Copyright: MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _AT91_PCM_H
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#define _AT91_PCM_H
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#include <mach/hardware.h>
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struct at91_ssc_periph {
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void __iomem *base;
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u32 pid;
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};
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/*
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* Registers and status bits that are required by the PCM driver.
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*/
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struct at91_pdc_regs {
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unsigned int xpr; /* PDC recv/trans pointer */
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unsigned int xcr; /* PDC recv/trans counter */
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unsigned int xnpr; /* PDC next recv/trans pointer */
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unsigned int xncr; /* PDC next recv/trans counter */
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unsigned int ptcr; /* PDC transfer control */
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};
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struct at91_ssc_mask {
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u32 ssc_enable; /* SSC recv/trans enable */
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u32 ssc_disable; /* SSC recv/trans disable */
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u32 ssc_endx; /* SSC ENDTX or ENDRX */
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u32 ssc_endbuf; /* SSC TXBUFE or RXBUFF */
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u32 pdc_enable; /* PDC recv/trans enable */
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u32 pdc_disable; /* PDC recv/trans disable */
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};
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/*
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* This structure, shared between the PCM driver and the interface,
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* contains all information required by the PCM driver to perform the
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* PDC DMA operation. All fields except dma_intr_handler() are initialized
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* by the interface. The dms_intr_handler() pointer is set by the PCM
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* driver and called by the interface SSC interrupt handler if it is
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* non-NULL.
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*/
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struct at91_pcm_dma_params {
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char *name; /* stream identifier */
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int pdc_xfer_size; /* PDC counter increment in bytes */
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void __iomem *ssc_base; /* SSC base address */
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struct at91_pdc_regs *pdc; /* PDC receive or transmit registers */
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struct at91_ssc_mask *mask;/* SSC & PDC status bits */
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struct snd_pcm_substream *substream;
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void (*dma_intr_handler)(u32, struct snd_pcm_substream *);
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};
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extern struct snd_soc_platform at91_soc_platform;
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#define at91_ssc_read(a) ((unsigned long) __raw_readl(a))
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#define at91_ssc_write(a,v) __raw_writel((v),(a))
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#endif /* _AT91_PCM_H */
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