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/* sound/soc/at32/at32-pcm.h
* ASoC PCM interface for Atmel AT32 SoC
*
* Copyright (C) 2008 Long Range Systems
* Geoffrey Wossum <gwossum@acm.org>
*
* 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 __SOUND_SOC_AT32_AT32_PCM_H
#define __SOUND_SOC_AT32_AT32_PCM_H __FILE__
#include <linux/atmel-ssc.h>
/*
* Registers and status bits that are required by the PCM driver
* TODO: Is ptcr really used?
*/
struct at32_pdc_regs {
u32 xpr; /* PDC RX/TX pointer */
u32 xcr; /* PDC RX/TX counter */
u32 xnpr; /* PDC next RX/TX pointer */
u32 xncr; /* PDC next RX/TX counter */
u32 ptcr; /* PDC transfer control */
};
/*
* SSC mask info
*/
struct at32_ssc_mask {
u32 ssc_enable; /* SSC RX/TX enable */
u32 ssc_disable; /* SSC RX/TX disable */
u32 ssc_endx; /* SSC ENDTX or ENDRX */
u32 ssc_endbuf; /* SSC TXBUFF or RXBUFF */
u32 pdc_enable; /* PDC RX/TX enable */
u32 pdc_disable; /* PDC RX/TX 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 at32_pcm_dma_params {
char *name; /* stream identifier */
int pdc_xfer_size; /* PDC counter increment in bytes */
struct ssc_device *ssc; /* SSC device for stream */
struct at32_pdc_regs *pdc; /* PDC register info */
struct at32_ssc_mask *mask; /* SSC mask info */
struct snd_pcm_substream *substream;
void (*dma_intr_handler) (u32, struct snd_pcm_substream *);
};
/*
* The AT32 ASoC platform driver
*/
extern struct snd_soc_platform at32_soc_platform;
/*
* SSC register access (since ssc_writel() / ssc_readl() require literal name)
*/
#define ssc_readx(base, reg) (__raw_readl((base) + (reg)))
#define ssc_writex(base, reg, value) __raw_writel((value), (base) + (reg))
#endif /* __SOUND_SOC_AT32_AT32_PCM_H */
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