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     static bool last_recording = false;
  49     bool recording = flags & SRCF_RECORDING;
  50
  51     switch (source)
  52     {
  53         default:                        /* playback - no recording */
  54             source = AUDIO_SRC_PLAYBACK;
  55         case AUDIO_SRC_PLAYBACK:
  56             audio_channels = 2;
  57             if (source != last_source)
  58             {
  59                 audiohw_set_monitor(false);
  60                 audiohw_disable_recording();
  61             }
  62             break;
  63
  64         case AUDIO_SRC_MIC:             /* recording only */
  65             audio_channels = 1;
  66             if (source != last_source)
  67             {
  68                 audiohw_set_monitor(false);
  69                 audiohw_enable_recording(true);  /* source mic */
  70             }
  71             break;
  72
  73         case AUDIO_SRC_FMRADIO:         /* recording and playback */
  74             audio_channels = 2;
  75
  76             if (source == last_source && recording == last_recording)
  77                 break;
  78
  79             last_recording = recording;
  80
  81             if (recording)
  82             {
  83                 audiohw_set_monitor(false);
  84                 audiohw_enable_recording(false);
  85             }
  86             else
  87             {
  88                 audiohw_disable_recording();
  89                 audiohw_set_monitor(true); /* line 1 analog audio path */
  90             }
  91             break;
  92     } /* end switch */
  93
  94     last_source = source;
  95 } /* audio_input_mux */
  96
  97
  98 void audiohw_set_sampr_dividers(int fsel)
  99 {
 100     /* Seems to predivide 24MHz by 2 for a source clock of 12MHz. Maybe
 101      * there's a way to set that? */
 102     static const struct
 103     {
 104         unsigned char iisclk;
 105         unsigned char iisdiv;
 106     } regvals[HW_NUM_FREQ] =
 107     {
 108         /* 8kHz - 24kHz work well but there seems to be a minor crackling
 109          * issue for playback at times and all possibilities were checked
 110          * for the divisors without any positive change.
 111          * 32kHz - 48kHz seem fine all around. */
 112 #if 0
 113         [HW_FREQ_8] =       /* CLK / 1500 (8000Hz) */
 114         {
 115             .iisclk = 24,
 116             .iisdiv = 59,
 117         },
 118         [HW_FREQ_11] =      /* CLK / 1088 (~11029.41Hz) */
 119         {
 120             .iisclk = 33,
 121             .iisdiv = 31,
 122         },
 123         [HW_FREQ_12] =      /* CLK / 1000 (120000Hz) */
 124         {
 125             .iisclk = 49,
 126             .iisdiv = 19,
 127         },
 128         [HW_FREQ_16] =      /* CLK / 750 (16000Hz) */
 129         {
 130             .iisclk = 24,
 131             .iisdiv = 29,
 132         },
 133         [HW_FREQ_22] =      /* CLK / 544 (~22058.82Hz)  */
 134         {
 135             .iisclk = 33,
 136             .iisdiv = 15,
 137         },
 138         [HW_FREQ_24] =      /* CLK / 500 (24000Hz) */
 139         {
 140             .iisclk = 49,
 141             .iisdiv = 9,
 142         },
 143 #endif
 144         [HW_FREQ_32] =      /* CLK / 375 (32000Hz) */
 145         {
 146             .iisclk = 24,
 147             .iisdiv = 14,
 148         },
 149         [HW_FREQ_44] =      /* CLK / 272 (~44117.68Hz) */
 150         {
 151             .iisclk = 33,
 152             .iisdiv = 7,
 153         },
 154         [HW_FREQ_48] =      /* CLK / 250 (48000Hz) */
 155         {
 156             .iisclk = 49,
 157             .iisdiv = 4,
 158         },
 159         /* going a bit higher would be nice to get 64kHz play, 32kHz rec, but a
 160          * close enough division isn't obtainable unless CLK can be changed */
 161     };
 162
 163     IISCLK = (IISCLK & ~0x17ff) | regvals[fsel].iisclk;
 164     IISDIV = (IISDIV & ~0xc000003f) | regvals[fsel].iisdiv;
 165 }
 166
 167 unsigned int pcm_sampr_type_rec_to_play(unsigned int samplerate)
 168 {
 169     /* Check if the samplerate is in the list of recordable rates.
 170      * Fail to default if not */
 171     int index = round_value_to_list32(samplerate, rec_freq_sampr,
 172                                       REC_NUM_FREQ, false);
 173     if (samplerate != rec_freq_sampr[index])
 174         return HW_SAMPR_DEFAULT;
 175
 176     return samplerate * 2; /* Recording rates are 1/2 the codec clock */
 177 }