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GitHub Repository: torvalds/linux
 Path: blob/master/sound/soc/atmel/atmel_ssc_dai.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */

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/*

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 * atmel_ssc_dai.h - ALSA SSC interface for the Atmel  SoC

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 *

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 * Copyright (C) 2005 SAN People

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 * Copyright (C) 2008 Atmel

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 *

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 * Author: Sedji Gaouaou <[email protected]>

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 *         ATMEL CORP.

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 *

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 * Based on at91-ssc.c by

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 * Frank Mandarino <[email protected]>

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 * Based on pxa2xx Platform drivers by

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 * Liam Girdwood <[email protected]>

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 */

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#ifndef _ATMEL_SSC_DAI_H

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#define _ATMEL_SSC_DAI_H

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#include <linux/types.h>

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#include <linux/atmel-ssc.h>

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#include "atmel-pcm.h"

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/* SSC system clock ids */

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#define ATMEL_SYSCLK_MCK	0 /* SSC uses AT91 MCK as system clock */

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/* SSC divider ids */

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#define ATMEL_SSC_CMR_DIV	0 /* MCK divider for BCLK */

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#define ATMEL_SSC_TCMR_PERIOD	1 /* BCLK divider for transmit FS */

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#define ATMEL_SSC_RCMR_PERIOD	2 /* BCLK divider for receive FS */

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/*

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 * SSC direction masks

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 */

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#define SSC_DIR_MASK_UNUSED	0

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#define SSC_DIR_MASK_PLAYBACK	1

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#define SSC_DIR_MASK_CAPTURE	2

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/*

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 * SSC register values that Atmel left out of <linux/atmel-ssc.h>.  These

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 * are expected to be used with SSC_BF

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 */

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/* START bit field values */

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#define SSC_START_CONTINUOUS	0

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#define SSC_START_TX_RX		1

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#define SSC_START_LOW_RF	2

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#define SSC_START_HIGH_RF	3

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#define SSC_START_FALLING_RF	4

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#define SSC_START_RISING_RF	5

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#define SSC_START_LEVEL_RF	6

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#define SSC_START_EDGE_RF	7

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#define SSS_START_COMPARE_0	8

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/* CKI bit field values */

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#define SSC_CKI_FALLING		0

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#define SSC_CKI_RISING		1

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/* CKO bit field values */

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#define SSC_CKO_NONE		0

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#define SSC_CKO_CONTINUOUS	1

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#define SSC_CKO_TRANSFER	2

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/* CKS bit field values */

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#define SSC_CKS_DIV		0

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#define SSC_CKS_CLOCK		1

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#define SSC_CKS_PIN		2

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/* FSEDGE bit field values */

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#define SSC_FSEDGE_POSITIVE	0

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#define SSC_FSEDGE_NEGATIVE	1

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/* FSOS bit field values */

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#define SSC_FSOS_NONE		0

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#define SSC_FSOS_NEGATIVE	1

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#define SSC_FSOS_POSITIVE	2

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#define SSC_FSOS_LOW		3

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#define SSC_FSOS_HIGH		4

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#define SSC_FSOS_TOGGLE		5

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#define START_DELAY		1

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struct atmel_ssc_state {

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	u32 ssc_cmr;

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	u32 ssc_rcmr;

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	u32 ssc_rfmr;

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	u32 ssc_tcmr;

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	u32 ssc_tfmr;

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	u32 ssc_sr;

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	u32 ssc_imr;

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};

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struct atmel_ssc_info {

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	char *name;

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	struct ssc_device *ssc;

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	unsigned short dir_mask;	/* 0=unused, 1=playback, 2=capture */

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	unsigned short initialized;	/* true if SSC has been initialized */

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	unsigned short daifmt;

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	unsigned short cmr_div;

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	unsigned short tcmr_period;

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	unsigned short rcmr_period;

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	unsigned int forced_divider;

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	struct atmel_pcm_dma_params *dma_params[2];

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	struct atmel_ssc_state ssc_state;

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	unsigned long mck_rate;

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};

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int atmel_ssc_set_audio(int ssc_id);

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void atmel_ssc_put_audio(int ssc_id);

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#endif /* _AT91_SSC_DAI_H */

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