1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * tegra20_das.h - Definitions for Tegra20 DAS driver
4  *
5  * Author: Stephen Warren <swarren@nvidia.com>
6  * Copyright (C) 2010,2012 - NVIDIA, Inc.
7  */
8 
9 #ifndef __TEGRA20_DAS_H__
10 #define __TEGRA20_DAS_H__
11 
12 /* Register TEGRA20_DAS_DAP_CTRL_SEL */
13 #define TEGRA20_DAS_DAP_CTRL_SEL			0x00
14 #define TEGRA20_DAS_DAP_CTRL_SEL_COUNT			5
15 #define TEGRA20_DAS_DAP_CTRL_SEL_STRIDE			4
16 #define TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P		31
17 #define TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_S		1
18 #define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P	30
19 #define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_S	1
20 #define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P	29
21 #define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_S	1
22 #define TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P		0
23 #define TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_S		5
24 
25 /* Values for field TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL */
26 #define TEGRA20_DAS_DAP_SEL_DAC1	0
27 #define TEGRA20_DAS_DAP_SEL_DAC2	1
28 #define TEGRA20_DAS_DAP_SEL_DAC3	2
29 #define TEGRA20_DAS_DAP_SEL_DAP1	16
30 #define TEGRA20_DAS_DAP_SEL_DAP2	17
31 #define TEGRA20_DAS_DAP_SEL_DAP3	18
32 #define TEGRA20_DAS_DAP_SEL_DAP4	19
33 #define TEGRA20_DAS_DAP_SEL_DAP5	20
34 
35 /* Register TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL */
36 #define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL			0x40
37 #define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_COUNT		3
38 #define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE		4
39 #define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P	28
40 #define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_S	4
41 #define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P	24
42 #define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_S	4
43 #define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P	0
44 #define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_S	4
45 
46 /*
47  * Values for:
48  * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL
49  * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL
50  * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL
51  */
52 #define TEGRA20_DAS_DAC_SEL_DAP1	0
53 #define TEGRA20_DAS_DAC_SEL_DAP2	1
54 #define TEGRA20_DAS_DAC_SEL_DAP3	2
55 #define TEGRA20_DAS_DAC_SEL_DAP4	3
56 #define TEGRA20_DAS_DAC_SEL_DAP5	4
57 
58 /*
59  * Names/IDs of the DACs/DAPs.
60  */
61 
62 #define TEGRA20_DAS_DAP_ID_1 0
63 #define TEGRA20_DAS_DAP_ID_2 1
64 #define TEGRA20_DAS_DAP_ID_3 2
65 #define TEGRA20_DAS_DAP_ID_4 3
66 #define TEGRA20_DAS_DAP_ID_5 4
67 
68 #define TEGRA20_DAS_DAC_ID_1 0
69 #define TEGRA20_DAS_DAC_ID_2 1
70 #define TEGRA20_DAS_DAC_ID_3 2
71 
72 struct tegra20_das {
73 	struct device *dev;
74 	struct regmap *regmap;
75 };
76 
77 /*
78  * Terminology:
79  * DAS: Digital audio switch (HW module controlled by this driver)
80  * DAP: Digital audio port (port/pins on Tegra device)
81  * DAC: Digital audio controller (e.g. I2S or AC97 controller elsewhere)
82  *
83  * The Tegra DAS is a mux/cross-bar which can connect each DAP to a specific
84  * DAC, or another DAP. When DAPs are connected, one must be the master and
85  * one the slave. Each DAC allows selection of a specific DAP for input, to
86  * cater for the case where N DAPs are connected to 1 DAC for broadcast
87  * output.
88  *
89  * This driver is dumb; no attempt is made to ensure that a valid routing
90  * configuration is programmed.
91  */
92 
93 /*
94  * Connect a DAP to a DAC
95  * dap_id: DAP to connect: TEGRA20_DAS_DAP_ID_*
96  * dac_sel: DAC to connect to: TEGRA20_DAS_DAP_SEL_DAC*
97  */
98 extern int tegra20_das_connect_dap_to_dac(int dap, int dac);
99 
100 /*
101  * Connect a DAP to another DAP
102  * dap_id: DAP to connect: TEGRA20_DAS_DAP_ID_*
103  * other_dap_sel: DAP to connect to: TEGRA20_DAS_DAP_SEL_DAP*
104  * master: Is this DAP the master (1) or slave (0)
105  * sdata1rx: Is this DAP's SDATA1 pin RX (1) or TX (0)
106  * sdata2rx: Is this DAP's SDATA2 pin RX (1) or TX (0)
107  */
108 extern int tegra20_das_connect_dap_to_dap(int dap, int otherdap,
109 					  int master, int sdata1rx,
110 					  int sdata2rx);
111 
112 /*
113  * Connect a DAC's input to a DAP
114  * (DAC outputs are selected by the DAP)
115  * dac_id: DAC ID to connect: TEGRA20_DAS_DAC_ID_*
116  * dap_sel: DAP to receive input from: TEGRA20_DAS_DAC_SEL_DAP*
117  */
118 extern int tegra20_das_connect_dac_to_dap(int dac, int dap);
119 
120 #endif
121