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  * All files in this archive are subject to the GNU General Public License.
  20  * See the file COPYING in the source tree root for full license agreement.
  21  *
  22  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  23  * KIND, either express or implied.
  24  *
  25  ****************************************************************************/
  26 #include "kernel.h"
  27 #include "wmcodec.h"
  28 #include "i2s.h"
  29 #include "audio.h"
  30 #include "audiohw.h"
  31 #include "system.h"
  32
  33 const struct sound_settings_info audiohw_settings[] = {
  34     [SOUND_VOLUME]        = {"dB", 0,  1, -74,   6, -25},
  35 #ifdef USE_ADAPTIVE_BASS
  36     [SOUND_BASS]          = {"",   0,  1,   0,  15,   0},
  37 #else
  38     [SOUND_BASS]          = {"dB", 1, 15, -60,  90,   0},
  39 #endif
  40     [SOUND_TREBLE]        = {"dB", 1, 15, -60,  90,   0},
  41     [SOUND_BALANCE]       = {"%",  0,  1,-100, 100,   0},
  42     [SOUND_CHANNELS]      = {"",   0,  1,   0,   5,   0},
  43     [SOUND_STEREO_WIDTH]  = {"%",  0,  5,   0, 250, 100},
  44 };
  45
  46 /* Flags used in combination with settings */
  47
  48 /* use zero crossing to reduce clicks during volume changes */
  49 #define LOUT1_BITS      (LOUT1_LO1ZC)
  50 /* latch left volume first then update left+right together */
  51 #define ROUT1_BITS      (ROUT1_RO1ZC | ROUT1_RO1VU)
  52 #define LOUT2_BITS      (LOUT2_LO2ZC)
  53 #define ROUT2_BITS      (ROUT2_RO2ZC | ROUT2_RO2VU)
  54 /* We use linear bass control with 200 Hz cutoff */
  55 #ifdef USE_ADAPTIVE_BASE
  56 #define BASSCTRL_BITS   (BASSCTRL_BC | BASSCTRL_BB)
  57 #else
  58 #define BASSCTRL_BITS   (BASSCTRL_BC)
  59 #endif
  60 /* We use linear treble control with 4 kHz cutoff */
  61 #define TREBCTRL_BITS   (TREBCTRL_TC)
  62
  63 /* convert tenth of dB volume (-730..60) to master volume register value */
  64 int tenthdb2master(int db)
  65 {
  66     /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
  67     /* 1111111 ==  +6dB  (0x7f)                            */
  68     /* 1111001 ==   0dB  (0x79)                            */
  69     /* 0110000 == -73dB  (0x30)                            */
  70     /* 0101111..0000000 == mute  (<= 0x2f)                 */
  71     if (db < VOLUME_MIN)
  72         return 0x0;
  73     else
  74         return (db / 10) + 73 + 0x30;
  75 }
  76
  77 static int tone_tenthdb2hw(int value)
  78 {
  79     /* -6.0db..+0db..+9.0db step 1.5db - translate -60..+0..+90 step 15
  80         to 10..6..0 step -1.
  81     */
  82     value = 10 - (value + 60) / 15;
  83
  84     if (value == 6)
  85         value = 0xf; /* 0db -> off */
  86
  87     return value;
  88 }
  89
  90
  91 #ifdef USE_ADAPTIVE_BASS
  92 static int adaptivebass2hw(int value)
  93 {
  94     /* 0 to 15 step 1 - step -1  0 = off is a 15 in the register */
  95     value = 15 - value;
  96
  97     return value;
  98 }
  99 #endif
 100
 101 /* Reset and power up the WM8751 */
 102 void audiohw_preinit(void)
 103 {
 104 #ifdef MROBE_100
 105     /* controls headphone ouput */
 106     GPIOL_ENABLE     |= 0x10;
 107     GPIOL_OUTPUT_EN  |= 0x10;
 108     GPIOL_OUTPUT_VAL |= 0x10; /* disable */
 109 #endif
 110
 111 #ifdef CPU_PP502x
 112     i2s_reset();
 113 #endif
 114
 115     /*
 116      * 1. Switch on power supplies.
 117      *    By default the WM8751 is in Standby Mode, the DAC is
 118      *    digitally muted and the Audio Interface, Line outputs
 119      *    and Headphone outputs are all OFF (DACMU = 1 Power
 120      *    Management registers 1 and 2 are all zeros).
 121      */
 122     wmcodec_write(RESET, RESET_RESET);    /*Reset*/
 123
 124      /* 2. Enable Vmid and VREF. */
 125     wmcodec_write(PWRMGMT1, PWRMGMT1_VREF | PWRMGMT1_VMIDSEL_5K);
 126
 127     /* BCLKINV=0(Dont invert BCLK) MS=1(Enable Master) LRSWAP=0 LRP=0 */
 128     /* IWL=00(16 bit) FORMAT=10(I2S format) */
 129     wmcodec_write(AINTFCE, AINTFCE_MS | AINTFCE_WL_16 |
 130                   AINTFCE_FORMAT_I2S);
 131 }
 132
 133 /* Enable DACs and audio output after a short delay */
 134 void audiohw_postinit(void)
 135 {
 136     /* From app notes: allow Vref to stabilize to reduce clicks */
 137     sleep(HZ);
 138
 139      /* 3. Enable DACs as required. */
 140     wmcodec_write(PWRMGMT2, PWRMGMT2_DACL | PWRMGMT2_DACR);
 141
 142      /* 4. Enable line and / or headphone output buffers as required. */
 143 #ifdef MROBE_100
 144     wmcodec_write(PWRMGMT2, PWRMGMT2_DACL | PWRMGMT2_DACR |
 145                   PWRMGMT2_LOUT1 | PWRMGMT2_ROUT1);
 146 #else
 147     wmcodec_write(PWRMGMT2, PWRMGMT2_DACL | PWRMGMT2_DACR |
 148                   PWRMGMT2_LOUT1 | PWRMGMT2_ROUT1 | PWRMGMT2_LOUT2 |
 149                   PWRMGMT2_ROUT2);
 150 #endif
 151
 152     wmcodec_write(ADDITIONAL1, ADDITIONAL1_TSDEN | ADDITIONAL1_TOEN |
 153                     ADDITIONAL1_DMONOMIX_LLRR | ADDITIONAL1_VSEL_DEFAULT);
 154
 155     wmcodec_write(LEFTMIX1, LEFTMIX1_LD2LO | LEFTMIX1_LI2LO_DEFAULT);
 156     wmcodec_write(RIGHTMIX2, RIGHTMIX2_RD2RO | RIGHTMIX2_RI2RO_DEFAULT);
 157
 158     audiohw_mute(false);
 159
 160 #ifdef MROBE_100
 161     /* enable headphone output */
 162     GPIOL_OUTPUT_VAL &= ~0x10;
 163     GPIOL_OUTPUT_EN  |=  0x10;
 164 #endif
 165 }
 166
 167 void audiohw_set_master_vol(int vol_l, int vol_r)
 168 {
 169     /* +6 to -73dB 1dB steps (plus mute == 80levels) 7bits */
 170     /* 1111111 ==  +6dB                                    */
 171     /* 1111001 ==   0dB                                    */
 172     /* 0110000 == -73dB                                    */
 173     /* 0101111 == mute (0x2f)                              */
 174
 175     wmcodec_write(LOUT1, LOUT1_BITS | LOUT1_LOUT1VOL(vol_l));
 176     wmcodec_write(ROUT1, ROUT1_BITS | ROUT1_ROUT1VOL(vol_r));
 177 }
 178
 179 #ifndef MROBE_100
 180 void audiohw_set_lineout_vol(int vol_l, int vol_r)
 181 {
 182     wmcodec_write(LOUT2, LOUT2_BITS | LOUT2_LOUT2VOL(vol_l));
 183     wmcodec_write(ROUT2, ROUT2_BITS | ROUT2_ROUT2VOL(vol_r));
 184 }
 185 #endif
 186
 187 void audiohw_set_bass(int value)
 188 {
 189     wmcodec_write(BASSCTRL, BASSCTRL_BITS |
 190
 191 #ifdef USE_ADAPTIVE_BASS
 192         BASSCTRL_BASS(adaptivebass2hw(value)));
 193 #else
 194         BASSCTRL_BASS(tone_tenthdb2hw(value)));
 195 #endif
 196 }
 197
 198 void audiohw_set_treble(int value)
 199 {
 200     wmcodec_write(TREBCTRL, TREBCTRL_BITS |
 201         TREBCTRL_TREB(tone_tenthdb2hw(value)));
 202 }
 203
 204 void audiohw_mute(bool mute)
 205 {
 206     /* Mute:   Set DACMU = 1 to soft-mute the audio DACs. */
 207     /* Unmute: Set DACMU = 0 to soft-un-mute the audio DACs. */
 208     wmcodec_write(DACCTRL, mute ? DACCTRL_DACMU : 0);
 209 }
 210
 211 /* Nice shutdown of WM8751 codec */
 212 void audiohw_close(void)
 213 {
 214     /* 1. Set DACMU = 1 to soft-mute the audio DACs. */
 215     audiohw_mute(true);
 216
 217     /* 2. Disable all output buffers. */
 218     wmcodec_write(PWRMGMT2, 0x0);
 219
 220     /* 3. Switch off the power supplies. */
 221     wmcodec_write(PWRMGMT1, 0x0);
 222 }
 223
 224 /* Note: Disable output before calling this function */
 225 void audiohw_set_frequency(int fsel)
 226 {
 227     wmcodec_write(CLOCKING, fsel);
 228 }