/* SPDX-License-Identifier: GPL-2.0-or-later */
|
/*
|
* at91-pcm.h - ALSA PCM interface for the Atmel AT91 SoC.
|
*
|
* Copyright (C) 2005 SAN People
|
* Copyright (C) 2008 Atmel
|
*
|
* Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
|
*
|
* Based on at91-pcm. by:
|
* Frank Mandarino <fmandarino@endrelia.com>
|
* Copyright 2006 Endrelia Technologies Inc.
|
*
|
* Based on pxa2xx-pcm.c by:
|
*
|
* Author: Nicolas Pitre
|
* Created: Nov 30, 2004
|
* Copyright: (C) 2004 MontaVista Software, Inc.
|
*/
|
|
#ifndef _ATMEL_PCM_H
|
#define _ATMEL_PCM_H
|
|
#include <linux/atmel-ssc.h>
|
|
#define ATMEL_SSC_DMABUF_SIZE (64 * 1024)
|
|
/*
|
* Registers and status bits that are required by the PCM driver.
|
*/
|
struct atmel_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 atmel_ssc_mask {
|
u32 ssc_enable; /* SSC recv/trans enable */
|
u32 ssc_disable; /* SSC recv/trans disable */
|
u32 ssc_error; /* SSC error conditions */
|
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 dma_intr_handler() pointer is set by the PCM
|
* driver and called by the interface SSC interrupt handler if it is
|
* non-NULL.
|
*/
|
struct atmel_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 atmel_pdc_regs *pdc; /* PDC receive or transmit registers */
|
struct atmel_ssc_mask *mask; /* SSC & PDC status bits */
|
struct snd_pcm_substream *substream;
|
void (*dma_intr_handler)(u32, struct snd_pcm_substream *);
|
};
|
|
/*
|
* 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))
|
|
#if IS_ENABLED(CONFIG_SND_ATMEL_SOC_PDC)
|
int atmel_pcm_pdc_platform_register(struct device *dev);
|
#else
|
static inline int atmel_pcm_pdc_platform_register(struct device *dev)
|
{
|
return 0;
|
}
|
#endif
|
|
#if IS_ENABLED(CONFIG_SND_ATMEL_SOC_DMA)
|
int atmel_pcm_dma_platform_register(struct device *dev);
|
#else
|
static inline int atmel_pcm_dma_platform_register(struct device *dev)
|
{
|
return 0;
|
}
|
#endif
|
|
#endif /* _ATMEL_PCM_H */
|
