firmware/target/arm/imx31/gigabeat-s/wmcodec-imx31.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Gigabeat S specific code for the WM8978 codec
  11  *
  12  * Copyright (C) 2008 Michael Sevakis
  13  *
  14  * All files in this archive are subject to the GNU General Public License.
  15  * See the file COPYING in the source tree root for full license agreement.
  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 "config.h"
  22 #include "system.h"
  23 #include "kernel.h"
  24 #include "sound.h"
  25 #include "i2c-imx31.h"
  26
  27 /* NOTE: Some port-specific bits will have to be moved away (node and GPIO
  28  * writes) for cleanest implementation. */
  29
  30 static struct i2c_node wm8978_i2c_node =
  31 {
  32     .num  = I2C1_NUM,
  33     .ifdr = I2C_IFDR_DIV192, /* 66MHz/.4MHz = 165, closest = 192 = 343750Hz */
  34                              /* Just hard-code for now - scaling may require
  35                               * updating */
  36     .addr = WMC_I2C_ADDR,
  37 };
  38
  39 void audiohw_init(void)
  40 {
  41     /* USB PLL = 338.688MHz, /30 = 11.2896MHz = 256Fs */
  42     imx31_regmod32(&CLKCTL_PDR1,
  43                    PDR1_SSI1_PODFw(64-1) | PDR1_SSI2_PODFw(5-1),
  44                    PDR1_SSI1_PODF | PDR1_SSI2_PODF);
  45     imx31_regmod32(&CLKCTL_PDR1,
  46                    PDR1_SSI1_PRE_PODFw(4-1) | PDR1_SSI2_PRE_PODFw(1-1),
  47                    PDR1_SSI1_PRE_PODF | PDR1_SSI2_PRE_PODF);
  48     i2c_enable_node(&wm8978_i2c_node, true);
  49
  50     audiohw_preinit();
  51
  52     GPIO3_DR |= (1 << 21); /* Turn on analogue LDO */
  53 }
  54
  55 void audiohw_enable_headphone_jack(bool enable)
  56 {
  57     if (enable)
  58     {
  59         GPIO3_DR |= (1 << 22); /* Turn on headphone jack output */
  60     }
  61     else
  62     {
  63         GPIO3_DR &= ~(1 << 22); /* Turn off headphone jack output */
  64     }
  65 }
  66
  67 void wmcodec_write(int reg, int data)
  68 {
  69     unsigned char d[2];
  70     /* |aaaaaaad|dddddddd| */
  71     d[0] = (reg << 1) | ((data & 0x100) >> 8);
  72     d[1] = data;
  73     i2c_write(&wm8978_i2c_node, d, 2);
  74 }