firmware/drivers/audio/wm8751.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Driver for WM8751 audio codec
  11  *
  12  * Based on code from the ipodlinux project - http://ipodlinux.org/
  13  * Adapted for Rockbox in December 2005
  14  *
  15  * Original file: linux/arch/armnommu/mach-ipod/audio.c
  16  *
  17  * Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
  18  *
  19  * This program is free software; you can redistribute it and/or
  20  * modify it under the terms of the GNU General Public License
  21  * as published by the Free Software Foundation; either version 2
  22  * of the License, or (at your option) any later version.
  23  *
  24  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  25  * KIND, either express or implied.
  26  *
  27  ****************************************************************************/
  28 #include "kernel.h"
  29 #include "wmcodec.h"
  30 #include "audio.h"
  31 #include "audiohw.h"
  32 #include "system.h"
  33
  34 const struct sound_settings_info audiohw_settings[] = {
  35     [SOUND_VOLUME]        = {"dB", 0,  1, -74,   6, -25},
  36 #ifdef USE_ADAPTIVE_BASS
  37     [SOUND_BASS]          = {"",   0,  1,   0,  15,   0},
  38 #else
  39     [SOUND_BASS]          = {"dB", 1, 15, -60,  90,   0},
  40 #endif
  41     [SOUND_TREBLE]        = {"dB", 1, 15, -60,  90,   0},
  42     [SOUND_BALANCE]       = {"%",  0,  1,-100, 100,   0},
  43     [SOUND_CHANNELS]      = {"",   0,  1,   0,   5,   0},
  44     [SOUND_STEREO_WIDTH]  = {"%",  0,  5,   0, 250, 100},
  45 };
  46
  47 /* Flags used in combination with settings */
  48
  49 /* use zero crossing to reduce clicks during volume changes */
  50 #define LOUT1_BITS      (LOUT1_LO1ZC)
  51 /* latch left volume first then update left+right together */
  52 #define ROUT1_BITS      (ROUT1_RO1ZC | ROUT1_RO1VU)
  53 #define LOUT2_BITS      (LOUT2_LO2ZC)
  54 #define ROUT2_BITS      (ROUT2_RO2ZC | ROUT2_RO2VU)
  55 /* We use linear bass control with 200 Hz cutoff */
  56 #ifdef USE_ADAPTIVE_BASE
  57 #define BASSCTRL_BITS   (BASSCTRL_BC | BASSCTRL_BB)
  58 #else
  59 #define BASSCTRL_BITS   (BASSCTRL_BC)
  60 #endif
  61 /* We use linear treble control with 4 kHz cutoff */
  62 #define TREBCTRL_BITS   (TREBCTRL_TC)
  63
  64 /* convert tenth of dB volume (-730..60) to master volume register value */
  65 int tenthdb2master(int db)
  66 {
  67     /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
  68     /* 1111111 ==  +6dB  (0x7f)                            */
  69     /* 1111001 ==   0dB  (0x79)                            */
  70     /* 0110000 == -73dB  (0x30)                            */
  71     /* 0101111..0000000 == mute  (<= 0x2f)                 */
  72     if (db < VOLUME_MIN)
  73         return 0x0;
  74     else
  75         return (db / 10) + 73 + 0x30;
  76 }
  77
  78 static int tone_tenthdb2hw(int value)
  79 {
  80     /* -6.0db..+0db..+9.0db step 1.5db - translate -60..+0..+90 step 15
  81         to 10..6..0 step -1.
  82     */
  83     value = 10 - (value + 60) / 15;
  84
  85     if (value == 6)
  86         value = 0xf; /* 0db -> off */
  87
  88     return value;
  89 }
  90
  91
  92 #ifdef USE_ADAPTIVE_BASS
  93 static int adaptivebass2hw(int value)
  94 {
  95     /* 0 to 15 step 1 - step -1  0 = off is a 15 in the register */
  96     value = 15 - value;
  97
  98     return value;
  99 }
 100 #endif
 101
 102 /* Reset and power up the WM8751 */
 103 void audiohw_preinit(void)
 104 {
 105 #ifdef MROBE_100
 106     /* controls headphone ouput */
 107     GPIOL_ENABLE     |= 0x10;
 108     GPIOL_OUTPUT_EN  |= 0x10;
 109     GPIOL_OUTPUT_VAL |= 0x10; /* disable */
 110 #endif
 111
 112 #ifdef CPU_PP502x
 113     i2s_reset();
 114 #endif
 115
 116     /*
 117      * 1. Switch on power supplies.
 118      *    By default the WM8751 is in Standby Mode, the DAC is
 119      *    digitally muted and the Audio Interface, Line outputs
 120      *    and Headphone outputs are all OFF (DACMU = 1 Power
 121      *    Management registers 1 and 2 are all zeros).
 122      */
 123     wmcodec_write(RESET, RESET_RESET);    /*Reset*/
 124
 125      /* 2. Enable Vmid and VREF. */
 126     wmcodec_write(PWRMGMT1, PWRMGMT1_VREF | PWRMGMT1_VMIDSEL_5K);
 127
 128     /* BCLKINV=0(Dont invert BCLK) MS=1(Enable Master) LRSWAP=0 LRP=0 */
 129     /* IWL=00(16 bit) FORMAT=10(I2S format) */
 130     wmcodec_write(AINTFCE, AINTFCE_MS | AINTFCE_WL_16 |
 131                   AINTFCE_FORMAT_I2S);
 132 }
 133
 134 /* Enable DACs and audio output after a short delay */
 135 void audiohw_postinit(void)
 136 {
 137     /* From app notes: allow Vref to stabilize to reduce clicks */
 138     sleep(HZ);
 139
 140      /* 3. Enable DACs as required. */
 141     wmcodec_write(PWRMGMT2, PWRMGMT2_DACL | PWRMGMT2_DACR);
 142
 143      /* 4. Enable line and / or headphone output buffers as required. */
 144 #ifdef MROBE_100
 145     wmcodec_write(PWRMGMT2, PWRMGMT2_DACL | PWRMGMT2_DACR |
 146                   PWRMGMT2_LOUT1 | PWRMGMT2_ROUT1);
 147 #else
 148     wmcodec_write(PWRMGMT2, PWRMGMT2_DACL | PWRMGMT2_DACR |
 149                   PWRMGMT2_LOUT1 | PWRMGMT2_ROUT1 | PWRMGMT2_LOUT2 |
 150                   PWRMGMT2_ROUT2);
 151 #endif
 152
 153     wmcodec_write(ADDITIONAL1, ADDITIONAL1_TSDEN | ADDITIONAL1_TOEN |
 154                     ADDITIONAL1_DMONOMIX_LLRR | ADDITIONAL1_VSEL_DEFAULT);
 155
 156     wmcodec_write(LEFTMIX1, LEFTMIX1_LD2LO | LEFTMIX1_LI2LO_DEFAULT);
 157     wmcodec_write(RIGHTMIX2, RIGHTMIX2_RD2RO | RIGHTMIX2_RI2RO_DEFAULT);
 158
 159     audiohw_mute(false);
 160
 161 #ifdef MROBE_100
 162     /* enable headphone output */
 163     GPIOL_OUTPUT_VAL &= ~0x10;
 164     GPIOL_OUTPUT_EN  |=  0x10;
 165 #endif
 166 }
 167
 168 void audiohw_set_master_vol(int vol_l, int vol_r)
 169 {
 170     /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
 171     /* 1111111 ==  +6dB                                    */
 172     /* 1111001 ==   0dB                                    */
 173     /* 0110000 == -73dB                                    */
 174     /* 0101111 == mute (0x2f)                              */
 175
 176     wmcodec_write(LOUT1, LOUT1_BITS | LOUT1_LOUT1VOL(vol_l));
 177     wmcodec_write(ROUT1, ROUT1_BITS | ROUT1_ROUT1VOL(vol_r));
 178 }
 179
 180 #ifndef MROBE_100
 181 void audiohw_set_lineout_vol(int vol_l, int vol_r)
 182 {
 183     wmcodec_write(LOUT2, LOUT2_BITS | LOUT2_LOUT2VOL(vol_l));
 184     wmcodec_write(ROUT2, ROUT2_BITS | ROUT2_ROUT2VOL(vol_r));
 185 }
 186 #endif
 187
 188 void audiohw_set_bass(int value)
 189 {
 190     wmcodec_write(BASSCTRL, BASSCTRL_BITS |
 191
 192 #ifdef USE_ADAPTIVE_BASS
 193         BASSCTRL_BASS(adaptivebass2hw(value)));
 194 #else
 195         BASSCTRL_BASS(tone_tenthdb2hw(value)));
 196 #endif
 197 }
 198
 199 void audiohw_set_treble(int value)
 200 {
 201     wmcodec_write(TREBCTRL, TREBCTRL_BITS |
 202         TREBCTRL_TREB(tone_tenthdb2hw(value)));
 203 }
 204
 205 void audiohw_mute(bool mute)
 206 {
 207     /* Mute:   Set DACMU = 1 to soft-mute the audio DACs. */
 208     /* Unmute: Set DACMU = 0 to soft-un-mute the audio DACs. */
 209     wmcodec_write(DACCTRL, mute ? DACCTRL_DACMU : 0);
 210 }
 211
 212 /* Nice shutdown of WM8751 codec */
 213 void audiohw_close(void)
 214 {
 215     /* 1. Set DACMU = 1 to soft-mute the audio DACs. */
 216     audiohw_mute(true);
 217
 218     /* 2. Disable all output buffers. */
 219     wmcodec_write(PWRMGMT2, 0x0);
 220
 221     /* 3. Switch off the power supplies. */
 222     wmcodec_write(PWRMGMT1, 0x0);
 223 }
 224
 225 /* Note: Disable output before calling this function */
 226 void audiohw_set_frequency(int fsel)
 227 {
 228     wmcodec_write(CLOCKING, fsel);
 229 }