firmware/tuner_samsung.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  * Tuner "middleware" for Samsung S1A0903X01 chip
  10  *
  11  * Copyright (C) 2003 Linus Nielsen Feltzing
  12  *
  13  * All files in this archive are subject to the GNU General Public License.
  14  * See the file COPYING in the source tree root for full license agreement.
  15  *
  16  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  17  * KIND, either express or implied.
  18  *
  19  ****************************************************************************/
  20
  21 #include <stdbool.h>
  22 #include <stdlib.h>
  23 #include "config.h"
  24 #include "tuner.h" /* tuner abstraction interface */
  25 #include "fmradio.h" /* physical interface driver */
  26 #include "mpeg.h"
  27 #include "sound.h"
  28
  29 #define DEFAULT_IN1 0x100003 /* Mute */
  30 #define DEFAULT_IN2 0x140884 /* 5kHz, 7.2MHz crystal */
  31 #define PLL_FREQ_STEP 10000
  32
  33 static int fm_in1;
  34 static int fm_in2;
  35
  36 /* tuner abstraction layer: set something to the tuner */
  37 void samsung_set(int setting, int value)
  38 {
  39     switch(setting)
  40     {
  41         case RADIO_SLEEP:
  42             if (!value)
  43             {   /* wakeup: just unit */
  44                 fm_in1 = DEFAULT_IN1;
  45                 fm_in2 = DEFAULT_IN2;
  46                 fmradio_set(1, fm_in1);
  47                 fmradio_set(2, fm_in2);
  48             }
  49             /* else we have no sleep mode? */
  50             break;
  51
  52         case RADIO_FREQUENCY:
  53         {
  54             int pll_cnt;
  55 #if CONFIG_CODEC == MAS3587F
  56             /* Shift the MAS internal clock away for certain frequencies to
  57              * avoid interference. */
  58             int pitch = 1000;
  59
  60             /* 4th harmonic falls in the FM frequency range */
  61             int if_freq = 4 * mpeg_get_mas_pllfreq();
  62
  63             /* shift the mas harmonic >= 300 kHz away using the direction
  64              * which needs less shifting. */
  65             if (value < if_freq)
  66             {
  67                 if (if_freq - value < 300000)
  68                     pitch = 1003 - (if_freq - value) / 100000;
  69             }
  70             else
  71             {
  72                 if (value - if_freq < 300000)
  73                     pitch = 997 + (value - if_freq) / 100000;
  74             }
  75             sound_set_pitch(pitch);
  76 #endif
  77             /* We add the standard Intermediate Frequency 10.7MHz
  78             ** before calculating the divisor
  79             ** The reference frequency is set to 50kHz, and the VCO
  80             ** output is prescaled by 2.
  81             */
  82
  83             pll_cnt = (value + 10700000) / (PLL_FREQ_STEP/2) / 2;
  84
  85             /* 0x100000 == FM mode
  86             ** 0x000002 == Microprocessor controlled Mute
  87             */
  88             fm_in1 = (fm_in1 & 0xfff00007) | (pll_cnt << 3);
  89             fmradio_set(1, fm_in1);
  90             break;
  91         }
  92
  93         case RADIO_MUTE:
  94             fm_in1 = (fm_in1 & 0xfffffffe) | (value?1:0);
  95             fmradio_set(1, fm_in1);
  96             break;
  97
  98         case RADIO_IF_MEASUREMENT:
  99             fm_in1 = (fm_in1 & 0xfffffffb) | (value?4:0);
 100             fmradio_set(1, fm_in1);
 101             break;
 102
 103         case RADIO_SENSITIVITY:
 104             fm_in2 = (fm_in2 & 0xffff9fff) | ((value & 3) << 13);
 105             fmradio_set(2, fm_in2);
 106             break;
 107
 108         case RADIO_FORCE_MONO:
 109             fm_in2 = (fm_in2 & 0xfffffffb) | (value?0:4);
 110             fmradio_set(2, fm_in2);
 111             break;
 112     }
 113 }
 114
 115 /* tuner abstraction layer: read something from the tuner */
 116 int samsung_get(int setting)
 117 {
 118     int val = -1;
 119     switch(setting)
 120     {
 121         case RADIO_PRESENT:
 122             fmradio_set(2, 0x140885); /* 5kHz, 7.2MHz crystal, test mode 1 */
 123             val = (fmradio_read(0) == 0x140885);
 124             break;
 125
 126         case RADIO_TUNED:
 127             val = fmradio_read(3);
 128             val = abs(10700 - ((val & 0x7ffff) / 8)) < 50; /* convert to kHz */
 129             break;
 130
 131         case RADIO_STEREO:
 132             val = fmradio_read(3);
 133             val = ((val & 0x100000) ? true : false);
 134     }
 135     return val;
 136 }