xref: /linux/sound/soc/atmel/atmel_ssc_dai.h (revision b746a1a2860f4a918f32d10dc569115d282aaf2f)
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 
82 struct 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 
93 struct 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 
108 int atmel_ssc_set_audio(int ssc_id);
109 void atmel_ssc_put_audio(int ssc_id);
110 
111 #endif /* _AT91_SSC_DAI_H */
112