firmware/target/arm/sandisk/audio-c200_e200.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 by Michael Sevakis
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include "system.h"
  22 #include "cpu.h"
  23 #include "audio.h"
  24 #include "sound.h"
  25 #include "general.h"
  26
  27 int audio_channels = 2;
  28 int audio_output_source = AUDIO_SRC_PLAYBACK;
  29
  30 void audio_set_output_source(int source)
  31 {
  32     int oldmode = set_fiq_status(FIQ_DISABLED);
  33
  34     if ((unsigned)source >= AUDIO_NUM_SOURCES)
  35         source = AUDIO_SRC_PLAYBACK;
  36
  37     audio_output_source = source;
  38
  39     if (source != AUDIO_SRC_PLAYBACK)
  40         IISCONFIG |= (1 << 29);
  41
  42     set_fiq_status(oldmode);
  43 } /* audio_set_output_source */
  44
  45 void audio_input_mux(int source, unsigned flags)
  46 {
  47     static int last_source = AUDIO_SRC_PLAYBACK;
  48 #ifdef HAVE_RECORDING
  49     static bool last_recording = false;
  50     bool recording = flags & SRCF_RECORDING;
  51 #else
  52     (void) flags;
  53 #endif
  54
  55     switch (source)
  56     {
  57         default:                        /* playback - no recording */
  58             source = AUDIO_SRC_PLAYBACK;
  59         case AUDIO_SRC_PLAYBACK:
  60             audio_channels = 2;
  61             if (source != last_source)
  62             {
  63 #if defined(HAVE_RECORDING) || defined(HAVE_FMRADIO_IN)
  64                 audiohw_set_monitor(false);
  65 #endif
  66 #ifdef HAVE_RECORDING
  67                 audiohw_disable_recording();
  68 #endif
  69             }
  70             break;
  71
  72 #if defined(HAVE_RECORDING) && (INPUT_SRC_CAPS & SRC_CAP_MIC)
  73         case AUDIO_SRC_MIC:             /* recording only */
  74             audio_channels = 1;
  75             if (source != last_source)
  76             {
  77                 audiohw_set_monitor(false);
  78                 audiohw_enable_recording(true);  /* source mic */
  79             }
  80             break;
  81 #endif
  82
  83 #if (INPUT_SRC_CAPS & SRC_CAP_FMRADIO)
  84         case AUDIO_SRC_FMRADIO:         /* recording and playback */
  85             audio_channels = 2;
  86
  87             if (source == last_source
  88 #ifdef HAVE_RECORDING
  89                     && recording == last_recording
  90 #endif
  91                 )
  92                 break;
  93
  94 #ifdef HAVE_RECORDING
  95             last_recording = recording;
  96             if (recording)
  97             {
  98                 audiohw_set_monitor(false);
  99                 audiohw_enable_recording(false);
 100             }
 101 #endif
 102             else
 103             {
 104 #ifdef HAVE_RECORDING
 105                 audiohw_disable_recording();
 106 #endif
 107 #if defined(HAVE_RECORDING) || defined(HAVE_FMRADIO_IN)
 108                 audiohw_set_monitor(true); /* line 1 analog audio path */
 109 #endif
 110
 111             }
 112             break;
 113 #endif /* (INPUT_SRC_CAPS & SRC_CAP_FMRADIO) */
 114     } /* end switch */
 115
 116     last_source = source;
 117 } /* audio_input_mux */
 118
 119
 120 void audiohw_set_sampr_dividers(int fsel)
 121 {
 122     /* Seems to predivide 24MHz by 2 for a source clock of 12MHz. Maybe
 123      * there's a way to set that? */
 124     static const struct
 125     {
 126         unsigned char iisclk;
 127         unsigned char iisdiv;
 128     } regvals[HW_NUM_FREQ] =
 129     {
 130         /* 8kHz - 24kHz work well but there seems to be a minor crackling
 131          * issue for playback at times and all possibilities were checked
 132          * for the divisors without any positive change.
 133          * 32kHz - 48kHz seem fine all around. */
 134 #if 0
 135         [HW_FREQ_8] =       /* CLK / 1500 (8000Hz) */
 136         {
 137             .iisclk = 24,
 138             .iisdiv = 59,
 139         },
 140         [HW_FREQ_11] =      /* CLK / 1088 (~11029.41Hz) */
 141         {
 142             .iisclk = 33,
 143             .iisdiv = 31,
 144         },
 145         [HW_FREQ_12] =      /* CLK / 1000 (120000Hz) */
 146         {
 147             .iisclk = 49,
 148             .iisdiv = 19,
 149         },
 150         [HW_FREQ_16] =      /* CLK / 750 (16000Hz) */
 151         {
 152             .iisclk = 24,
 153             .iisdiv = 29,
 154         },
 155         [HW_FREQ_22] =      /* CLK / 544 (~22058.82Hz)  */
 156         {
 157             .iisclk = 33,
 158             .iisdiv = 15,
 159         },
 160         [HW_FREQ_24] =      /* CLK / 500 (24000Hz) */
 161         {
 162             .iisclk = 49,
 163             .iisdiv = 9,
 164         },
 165 #endif
 166         [HW_FREQ_32] =      /* CLK / 375 (32000Hz) */
 167         {
 168             .iisclk = 24,
 169             .iisdiv = 14,
 170         },
 171         [HW_FREQ_44] =      /* CLK / 272 (~44117.68Hz) */
 172         {
 173             .iisclk = 33,
 174             .iisdiv = 7,
 175         },
 176         [HW_FREQ_48] =      /* CLK / 250 (48000Hz) */
 177         {
 178             .iisclk = 49,
 179             .iisdiv = 4,
 180         },
 181         /* going a bit higher would be nice to get 64kHz play, 32kHz rec, but a
 182          * close enough division isn't obtainable unless CLK can be changed */
 183     };
 184
 185     IISCLK = (IISCLK & ~0x17ff) | regvals[fsel].iisclk;
 186     IISDIV = (IISDIV & ~0xc000003f) | regvals[fsel].iisdiv;
 187 }
 188
 189 #ifdef CONFIG_SAMPR_TYPES
 190 unsigned int pcm_sampr_to_hw_sampr(unsigned int samplerate,
 191                                    unsigned int type)
 192 {
 193 #ifdef HAVE_RECORDING
 194     if (samplerate != HW_SAMPR_RESET && type == SAMPR_TYPE_REC)
 195     {
 196         /* Check if the samplerate is in the list of recordable rates.
 197          * Fail to default if not */
 198         int index = round_value_to_list32(samplerate, rec_freq_sampr,
 199                                           REC_NUM_FREQ, false);
 200         if (samplerate != rec_freq_sampr[index])
 201             samplerate = REC_SAMPR_DEFAULT;
 202
 203         samplerate *= 2; /* Recording rates are 1/2 the codec clock */
 204     }
 205 #endif /* HAVE_RECORDING */
 206
 207     return samplerate;
 208     (void)type;
 209 }
 210 #endif /* CONFIG_SAMPR_TYPES */