LXR linux/sound/soc/tegra/tegra

   1/*
   2 * tegra_das.h - Definitions for Tegra DAS driver
   3 *
   4 * Author: Stephen Warren <swarren@nvidia.com>
   5 * Copyright (C) 2010 - NVIDIA, Inc.
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License
   9 * version 2 as published by the Free Software Foundation.
  10 *
  11 * This program is distributed in the hope that it will be useful, but
  12 * WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 * General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  19 * 02110-1301 USA
  20 *
  21 */
  22
  23#ifndef __TEGRA_DAS_H__
  24#define __TEGRA_DAS_H__
  25
  26/* Register TEGRA_DAS_DAP_CTRL_SEL */
  27#define TEGRA_DAS_DAP_CTRL_SEL                          0x00
  28#define TEGRA_DAS_DAP_CTRL_SEL_COUNT                    5
  29#define TEGRA_DAS_DAP_CTRL_SEL_STRIDE                   4
  30#define TEGRA_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P             31
  31#define TEGRA_DAS_DAP_CTRL_SEL_DAP_MS_SEL_S             1
  32#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P       30
  33#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_S       1
  34#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P       29
  35#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_S       1
  36#define TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P           0
  37#define TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_S           5
  38
  39/* Values for field TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL */
  40#define TEGRA_DAS_DAP_SEL_DAC1  0
  41#define TEGRA_DAS_DAP_SEL_DAC2  1
  42#define TEGRA_DAS_DAP_SEL_DAC3  2
  43#define TEGRA_DAS_DAP_SEL_DAP1  16
  44#define TEGRA_DAS_DAP_SEL_DAP2  17
  45#define TEGRA_DAS_DAP_SEL_DAP3  18
  46#define TEGRA_DAS_DAP_SEL_DAP4  19
  47#define TEGRA_DAS_DAP_SEL_DAP5  20
  48
  49/* Register TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL */
  50#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL                        0x40
  51#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_COUNT                  3
  52#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE                 4
  53#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P       28
  54#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_S       4
  55#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P       24
  56#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_S       4
  57#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P          0
  58#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_S          4
  59
  60/*
  61 * Values for:
  62 * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL
  63 * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL
  64 * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL
  65 */
  66#define TEGRA_DAS_DAC_SEL_DAP1  0
  67#define TEGRA_DAS_DAC_SEL_DAP2  1
  68#define TEGRA_DAS_DAC_SEL_DAP3  2
  69#define TEGRA_DAS_DAC_SEL_DAP4  3
  70#define TEGRA_DAS_DAC_SEL_DAP5  4
  71
  72/*
  73 * Names/IDs of the DACs/DAPs.
  74 */
  75
  76#define TEGRA_DAS_DAP_ID_1 0
  77#define TEGRA_DAS_DAP_ID_2 1
  78#define TEGRA_DAS_DAP_ID_3 2
  79#define TEGRA_DAS_DAP_ID_4 3
  80#define TEGRA_DAS_DAP_ID_5 4
  81
  82#define TEGRA_DAS_DAC_ID_1 0
  83#define TEGRA_DAS_DAC_ID_2 1
  84#define TEGRA_DAS_DAC_ID_3 2
  85
  86struct tegra_das {
  87        struct device *dev;
  88        void __iomem *regs;
  89        struct dentry *debug;
  90};
  91
  92/*
  93 * Terminology:
  94 * DAS: Digital audio switch (HW module controlled by this driver)
  95 * DAP: Digital audio port (port/pins on Tegra device)
  96 * DAC: Digital audio controller (e.g. I2S or AC97 controller elsewhere)
  97 * 
  98 * The Tegra DAS is a mux/cross-bar which can connect each DAP to a specific
  99 * DAC, or another DAP. When DAPs are connected, one must be the master and
 100 * one the slave. Each DAC allows selection of a specific DAP for input, to
 101 * cater for the case where N DAPs are connected to 1 DAC for broadcast
 102 * output.
 103 *
 104 * This driver is dumb; no attempt is made to ensure that a valid routing
 105 * configuration is programmed.
 106 */
 107
 108/*
 109 * Connect a DAP to to a DAC
 110 * dap_id: DAP to connect: TEGRA_DAS_DAP_ID_*
 111 * dac_sel: DAC to connect to: TEGRA_DAS_DAP_SEL_DAC*
 112 */
 113extern int tegra_das_connect_dap_to_dac(int dap_id, int dac_sel);
 114
 115/*
 116 * Connect a DAP to to another DAP
 117 * dap_id: DAP to connect: TEGRA_DAS_DAP_ID_*
 118 * other_dap_sel: DAP to connect to: TEGRA_DAS_DAP_SEL_DAP*
 119 * master: Is this DAP the master (1) or slave (0)
 120 * sdata1rx: Is this DAP's SDATA1 pin RX (1) or TX (0)
 121 * sdata2rx: Is this DAP's SDATA2 pin RX (1) or TX (0)
 122 */
 123extern int tegra_das_connect_dap_to_dap(int dap_id, int other_dap_sel,
 124                                        int master, int sdata1rx,
 125                                        int sdata2rx);
 126
 127/*
 128 * Connect a DAC's input to a DAP
 129 * (DAC outputs are selected by the DAP)
 130 * dac_id: DAC ID to connect: TEGRA_DAS_DAC_ID_*
 131 * dap_sel: DAP to receive input from: TEGRA_DAS_DAC_SEL_DAP*
 132 */
 133extern int tegra_das_connect_dac_to_dap(int dac_id, int dap_sel);
 134
 135#endif
 136