LXR linux/include/linux/platform_data/davinci

   1/*
   2 * TI DaVinci Audio Serial Port support
   3 *
   4 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License as
   8 * published by the Free Software Foundation version 2.
   9 *
  10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11 * kind, whether express or implied; without even the implied warranty
  12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13 * GNU General Public License for more details.
  14 */
  15
  16#ifndef __DAVINCI_ASP_H
  17#define __DAVINCI_ASP_H
  18
  19#include <linux/genalloc.h>
  20
  21struct snd_platform_data {
  22        u32 tx_dma_offset;
  23        u32 rx_dma_offset;
  24        int asp_chan_q; /* event queue number for ASP channel */
  25        int ram_chan_q; /* event queue number for RAM channel */
  26        /*
  27         * Allowing this is more efficient and eliminates left and right swaps
  28         * caused by underruns, but will swap the left and right channels
  29         * when compared to previous behavior.
  30         */
  31        unsigned enable_channel_combine:1;
  32        unsigned sram_size_playback;
  33        unsigned sram_size_capture;
  34        struct gen_pool *sram_pool;
  35
  36        /*
  37         * If McBSP peripheral gets the clock from an external pin,
  38         * there are three chooses, that are MCBSP_CLKX, MCBSP_CLKR
  39         * and MCBSP_CLKS.
  40         * Depending on different hardware connections it is possible
  41         * to use this setting to change the behaviour of McBSP
  42         * driver.
  43         */
  44        int clk_input_pin;
  45
  46        /*
  47         * This flag works when both clock and FS are outputs for the cpu
  48         * and makes clock more accurate (FS is not symmetrical and the
  49         * clock is very fast.
  50         * The clock becoming faster is named
  51         * i2s continuous serial clock (I2S_SCK) and it is an externally
  52         * visible bit clock.
  53         *
  54         * first line : WordSelect
  55         * second line : ContinuousSerialClock
  56         * third line: SerialData
  57         *
  58         * SYMMETRICAL APPROACH:
  59         *   _______________________          LEFT
  60         * _|         RIGHT         |______________________|
  61         *     _   _         _   _   _   _         _   _
  62         *   _| |_| |_ x16 _| |_| |_| |_| |_ x16 _| |_| |_
  63         *     _   _         _   _   _   _         _   _
  64         *   _/ \_/ \_ ... _/ \_/ \_/ \_/ \_ ... _/ \_/ \_
  65         *    \_/ \_/       \_/ \_/ \_/ \_/       \_/ \_/
  66         *
  67         * ACCURATE CLOCK APPROACH:
  68         *   ______________          LEFT
  69         * _|     RIGHT    |_______________________________|
  70         *     _         _   _         _   _   _   _   _   _
  71         *   _| |_ x16 _| |_| |_ x16 _| |_| |_| |_| |_| |_| |
  72         *     _         _   _          _      dummy cycles
  73         *   _/ \_ ... _/ \_/ \_  ... _/ \__________________
  74         *    \_/       \_/ \_/        \_/
  75         *
  76         */
  77        bool i2s_accurate_sck;
  78
  79        /* McASP specific fields */
  80        int tdm_slots;
  81        u8 op_mode;
  82        u8 num_serializer;
  83        u8 *serial_dir;
  84        u8 version;
  85        u8 txnumevt;
  86        u8 rxnumevt;
  87};
  88
  89enum {
  90        MCASP_VERSION_1 = 0,    /* DM646x */
  91        MCASP_VERSION_2,        /* DA8xx/OMAPL1x */
  92        MCASP_VERSION_3,        /* TI81xx/AM33xx */
  93};
  94
  95enum mcbsp_clk_input_pin {
  96        MCBSP_CLKR = 0,         /* as in DM365 */
  97        MCBSP_CLKS,
  98};
  99
 100#define INACTIVE_MODE   0
 101#define TX_MODE         1
 102#define RX_MODE         2
 103
 104#define DAVINCI_MCASP_IIS_MODE  0
 105#define DAVINCI_MCASP_DIT_MODE  1
 106
 107#endif
 108