firmware/drivers/tuner/s1a0903x01.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  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ****************************************************************************/
  22
  23 #include <stdbool.h>
  24 #include <stdlib.h>
  25 #include "config.h"
  26 #include "kernel.h"
  27 #include "tuner.h" /* tuner abstraction interface */
  28 #include "fmradio.h" /* physical interface driver */
  29 #include "mpeg.h"
  30 #include "sound.h"
  31
  32 #define DEFAULT_IN1 0x100003 /* Mute */
  33 #define DEFAULT_IN2 0x140884 /* 5kHz, 7.2MHz crystal */
  34 #define PLL_FREQ_STEP 10000
  35
  36 static int fm_in1;
  37 static int fm_in2;
  38 static int fm_present = -1; /* unknown */
  39
  40 /* tuner abstraction layer: set something to the tuner */
  41 int s1a0903x01_set(int setting, int value)
  42 {
  43     int val = 1;
  44
  45     switch(setting)
  46     {
  47         case RADIO_SLEEP:
  48             if (!value)
  49             {   /* wakeup: just unit */
  50                 fm_in1 = DEFAULT_IN1;
  51                 fm_in2 = DEFAULT_IN2;
  52                 fmradio_set(1, fm_in1);
  53                 fmradio_set(2, fm_in2);
  54             }
  55             /* else we have no sleep mode? */
  56             break;
  57
  58         case RADIO_FREQUENCY:
  59         {
  60             int pll_cnt;
  61 #if CONFIG_CODEC == MAS3587F
  62             /* Shift the MAS internal clock away for certain frequencies to
  63              * avoid interference. */
  64             int pitch = 1000;
  65
  66             /* 4th harmonic falls in the FM frequency range */
  67             int if_freq = 4 * mpeg_get_mas_pllfreq();
  68
  69             /* shift the mas harmonic >= 300 kHz away using the direction
  70              * which needs less shifting. */
  71             if (value < if_freq)
  72             {
  73                 if (if_freq - value < 300000)
  74                     pitch = 1003 - (if_freq - value) / 100000;
  75             }
  76             else
  77             {
  78                 if (value - if_freq < 300000)
  79                     pitch = 997 + (value - if_freq) / 100000;
  80             }
  81             sound_set_pitch(pitch);
  82 #endif
  83             /* We add the standard Intermediate Frequency 10.7MHz
  84             ** before calculating the divisor
  85             ** The reference frequency is set to 50kHz, and the VCO
  86             ** output is prescaled by 2.
  87             */
  88
  89             pll_cnt = (value + 10700000) / (PLL_FREQ_STEP/2) / 2;
  90
  91             /* 0x100000 == FM mode
  92             ** 0x000002 == Microprocessor controlled Mute
  93             */
  94             fm_in1 = (fm_in1 & 0xfff00007) | (pll_cnt << 3);
  95             fmradio_set(1, fm_in1);
  96             break;
  97         }
  98
  99         case RADIO_SCAN_FREQUENCY:
 100             /* Tune in and delay */
 101             s1a0903x01_set(RADIO_FREQUENCY, value);
 102             sleep(1);
 103             /* Start IF measurement */
 104             fm_in1 |= 4;
 105             fmradio_set(1, fm_in1);
 106             sleep(1);
 107             val = s1a0903x01_get(RADIO_TUNED);
 108             break;
 109
 110         case RADIO_MUTE:
 111             fm_in1 = (fm_in1 & 0xfffffffe) | (value?1:0);
 112             fmradio_set(1, fm_in1);
 113             break;
 114
 115         case RADIO_FORCE_MONO:
 116             fm_in2 = (fm_in2 & 0xfffffffb) | (value?0:4);
 117             fmradio_set(2, fm_in2);
 118             break;
 119         /* NOTE: These were only zeroed when starting the tuner from OFF
 120                  but the default values already set them to 0. */
 121 #if 0
 122         case S1A0903X01_IF_MEASUREMENT:
 123             fm_in1 = (fm_in1 & 0xfffffffb) | (value?4:0);
 124             fmradio_set(1, fm_in1);
 125             break;
 126
 127         case S1A0903X01_SENSITIVITY:
 128             fm_in2 = (fm_in2 & 0xffff9fff) | ((value & 3) << 13);
 129             fmradio_set(2, fm_in2);
 130             break;
 131 #endif
 132         default:
 133             val = -1;
 134     }
 135
 136     return val;
 137 }
 138
 139 /* tuner abstraction layer: read something from the tuner */
 140 int s1a0903x01_get(int setting)
 141 {
 142     int val = -1;
 143     switch(setting)
 144     {
 145         case RADIO_PRESENT:
 146             if (fm_present == -1)
 147             {
 148 #ifdef HAVE_TUNER_PWR_CTRL
 149                 bool fmstatus = tuner_power(true);
 150 #endif
 151                 /* 5kHz, 7.2MHz crystal, test mode 1 */
 152                 fmradio_set(2, 0x140885);
 153                 fm_present = (fmradio_read(0) == 0x140885);
 154 #ifdef HAVE_TUNER_PWR_CTRL
 155                 if (!fmstatus)
 156                     tuner_power(false);
 157 #endif
 158             }
 159
 160             val = fm_present;
 161             break;
 162
 163         case RADIO_TUNED:
 164             val = fmradio_read(3);
 165             val = abs(10700 - ((val & 0x7ffff) / 8)) < 50; /* convert to kHz */
 166             break;
 167
 168         case RADIO_STEREO:
 169             val = fmradio_read(3);
 170             val = ((val & 0x100000) ? true : false);
 171             break;
 172     }
 173     return val;
 174 }