1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * atmel_ssc_dai.h - ALSA SSC interface for the Atmel  SoC
4 *
5 * Copyright (C) 2005 SAN People
6 * Copyright (C) 2008 Atmel
7 *
8 * Author: Sedji Gaouaou <sedji.gaouaou@atmel.com>
9 *         ATMEL CORP.
10 *
11 * Based on at91-ssc.c by
12 * Frank Mandarino <fmandarino@endrelia.com>
13 * Based on pxa2xx Platform drivers by
14 * Liam Girdwood <lrg@slimlogic.co.uk>
15 */
16
17#ifndef _ATMEL_SSC_DAI_H
18#define _ATMEL_SSC_DAI_H
19
20#include <linux/types.h>
21#include <linux/atmel-ssc.h>
22
23#include "atmel-pcm.h"
24
25/* SSC system clock ids */
26#define ATMEL_SYSCLK_MCK	0 /* SSC uses AT91 MCK as system clock */
27
28/* SSC divider ids */
29#define ATMEL_SSC_CMR_DIV	0 /* MCK divider for BCLK */
30#define ATMEL_SSC_TCMR_PERIOD	1 /* BCLK divider for transmit FS */
31#define ATMEL_SSC_RCMR_PERIOD	2 /* BCLK divider for receive FS */
32/*
33 * SSC direction masks
34 */
35#define SSC_DIR_MASK_UNUSED	0
36#define SSC_DIR_MASK_PLAYBACK	1
37#define SSC_DIR_MASK_CAPTURE	2
38
39/*
40 * SSC register values that Atmel left out of <linux/atmel-ssc.h>.  These
41 * are expected to be used with SSC_BF
42 */
43/* START bit field values */
44#define SSC_START_CONTINUOUS	0
45#define SSC_START_TX_RX		1
46#define SSC_START_LOW_RF	2
47#define SSC_START_HIGH_RF	3
48#define SSC_START_FALLING_RF	4
49#define SSC_START_RISING_RF	5
50#define SSC_START_LEVEL_RF	6
51#define SSC_START_EDGE_RF	7
52#define SSS_START_COMPARE_0	8
53
54/* CKI bit field values */
55#define SSC_CKI_FALLING		0
56#define SSC_CKI_RISING		1
57
58/* CKO bit field values */
59#define SSC_CKO_NONE		0
60#define SSC_CKO_CONTINUOUS	1
61#define SSC_CKO_TRANSFER	2
62
63/* CKS bit field values */
64#define SSC_CKS_DIV		0
65#define SSC_CKS_CLOCK		1
66#define SSC_CKS_PIN		2
67
68/* FSEDGE bit field values */
69#define SSC_FSEDGE_POSITIVE	0
70#define SSC_FSEDGE_NEGATIVE	1
71
72/* FSOS bit field values */
73#define SSC_FSOS_NONE		0
74#define SSC_FSOS_NEGATIVE	1
75#define SSC_FSOS_POSITIVE	2
76#define SSC_FSOS_LOW		3
77#define SSC_FSOS_HIGH		4
78#define SSC_FSOS_TOGGLE		5
79
80#define START_DELAY		1
81
82struct atmel_ssc_state {
83	u32 ssc_cmr;
84	u32 ssc_rcmr;
85	u32 ssc_rfmr;
86	u32 ssc_tcmr;
87	u32 ssc_tfmr;
88	u32 ssc_sr;
89	u32 ssc_imr;
90};
91
92
93struct atmel_ssc_info {
94	char *name;
95	struct ssc_device *ssc;
96	unsigned short dir_mask;	/* 0=unused, 1=playback, 2=capture */
97	unsigned short initialized;	/* true if SSC has been initialized */
98	unsigned short daifmt;
99	unsigned short cmr_div;
100	unsigned short tcmr_period;
101	unsigned short rcmr_period;
102	unsigned int forced_divider;
103	struct atmel_pcm_dma_params *dma_params[2];
104	struct atmel_ssc_state ssc_state;
105	unsigned long mck_rate;
106};
107
108int atmel_ssc_set_audio(int ssc_id);
109void atmel_ssc_put_audio(int ssc_id);
110
111#endif /* _AT91_SSC_DAI_H */
112