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tegra_das.h

/*
 * tegra_das.h - Definitions for Tegra DAS driver
 *
 * Author: Stephen Warren <swarren@nvidia.com>
 * Copyright (C) 2010 - NVIDIA, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#ifndef __TEGRA_DAS_H__
#define __TEGRA_DAS_H__

/* Register TEGRA_DAS_DAP_CTRL_SEL */
#define TEGRA_DAS_DAP_CTRL_SEL                        0x00
#define TEGRA_DAS_DAP_CTRL_SEL_COUNT                  5
#define TEGRA_DAS_DAP_CTRL_SEL_STRIDE                 4
#define TEGRA_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P           31
#define TEGRA_DAS_DAP_CTRL_SEL_DAP_MS_SEL_S           1
#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P     30
#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_S     1
#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P     29
#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_S     1
#define TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P         0
#define TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_S         5

/* Values for field TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL */
#define TEGRA_DAS_DAP_SEL_DAC1      0
#define TEGRA_DAS_DAP_SEL_DAC2      1
#define TEGRA_DAS_DAP_SEL_DAC3      2
#define TEGRA_DAS_DAP_SEL_DAP1      16
#define TEGRA_DAS_DAP_SEL_DAP2      17
#define TEGRA_DAS_DAP_SEL_DAP3      18
#define TEGRA_DAS_DAP_SEL_DAP4      19
#define TEGRA_DAS_DAP_SEL_DAP5      20

/* Register TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL */
#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL              0x40
#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_COUNT              3
#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE             4
#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P   28
#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_S   4
#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P   24
#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_S   4
#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P            0
#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_S            4

/*
 * Values for:
 * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL
 * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL
 * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL
 */
#define TEGRA_DAS_DAC_SEL_DAP1      0
#define TEGRA_DAS_DAC_SEL_DAP2      1
#define TEGRA_DAS_DAC_SEL_DAP3      2
#define TEGRA_DAS_DAC_SEL_DAP4      3
#define TEGRA_DAS_DAC_SEL_DAP5      4

/*
 * Names/IDs of the DACs/DAPs.
 */

#define TEGRA_DAS_DAP_ID_1 0
#define TEGRA_DAS_DAP_ID_2 1
#define TEGRA_DAS_DAP_ID_3 2
#define TEGRA_DAS_DAP_ID_4 3
#define TEGRA_DAS_DAP_ID_5 4

#define TEGRA_DAS_DAC_ID_1 0
#define TEGRA_DAS_DAC_ID_2 1
#define TEGRA_DAS_DAC_ID_3 2

00086 struct tegra_das {
      struct device *dev;
      void __iomem *regs;
      struct dentry *debug;
};

/*
 * Terminology:
 * DAS: Digital audio switch (HW module controlled by this driver)
 * DAP: Digital audio port (port/pins on Tegra device)
 * DAC: Digital audio controller (e.g. I2S or AC97 controller elsewhere)
 * 
 * The Tegra DAS is a mux/cross-bar which can connect each DAP to a specific
 * DAC, or another DAP. When DAPs are connected, one must be the master and
 * one the slave. Each DAC allows selection of a specific DAP for input, to
 * cater for the case where N DAPs are connected to 1 DAC for broadcast
 * output.
 *
 * This driver is dumb; no attempt is made to ensure that a valid routing
 * configuration is programmed.
 */

/*
 * Connect a DAP to to a DAC
 * dap_id: DAP to connect: TEGRA_DAS_DAP_ID_*
 * dac_sel: DAC to connect to: TEGRA_DAS_DAP_SEL_DAC*
 */
extern int tegra_das_connect_dap_to_dac(int dap_id, int dac_sel);

/*
 * Connect a DAP to to another DAP
 * dap_id: DAP to connect: TEGRA_DAS_DAP_ID_*
 * other_dap_sel: DAP to connect to: TEGRA_DAS_DAP_SEL_DAP*
 * master: Is this DAP the master (1) or slave (0)
 * sdata1rx: Is this DAP's SDATA1 pin RX (1) or TX (0)
 * sdata2rx: Is this DAP's SDATA2 pin RX (1) or TX (0)
 */
extern int tegra_das_connect_dap_to_dap(int dap_id, int other_dap_sel,
                              int master, int sdata1rx,
                              int sdata2rx);

/*
 * Connect a DAC's input to a DAP
 * (DAC outputs are selected by the DAP)
 * dac_id: DAC ID to connect: TEGRA_DAS_DAC_ID_*
 * dap_sel: DAP to receive input from: TEGRA_DAS_DAC_SEL_DAP*
 */
extern int tegra_das_connect_dac_to_dap(int dac_id, int dap_sel);

#endif

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