firmware/drivers/pcf50605.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Driver for pcf50605 PMU and RTC
  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/pcf50605.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 "system.h"
  29 #include "config.h"
  30 #if CONFIG_I2C == I2C_PP5020 || CONFIG_I2C == I2C_PP5002
  31 #include "i2c-pp.h"
  32 #endif
  33 #include "rtc.h"
  34 #include "pcf5060x.h"
  35 #include "pcf50605.h"
  36
  37 unsigned char pcf50605_wakeup_flags = 0;
  38
  39 int pcf50605_read(int address)
  40 {
  41     return i2c_readbyte(0x8,address);
  42 }
  43
  44 int pcf50605_read_multiple(int address, unsigned char* buf, int count)
  45 {
  46     int read = i2c_readbytes(0x08, address, count, buf);
  47     return read - count;
  48 }
  49
  50 int pcf50605_write(int address, unsigned char val)
  51 {
  52     pp_i2c_send(0x8, address, val);
  53     return 0;
  54 }
  55
  56 int pcf50605_write_multiple(int address, const unsigned char* buf, int count)
  57 {
  58     int i;
  59
  60     i2c_lock();
  61
  62     for (i = 0; i < count; i++)
  63         pp_i2c_send(0x8, address + i, buf[i]);
  64
  65     i2c_unlock();
  66
  67     return 0;
  68 }
  69
  70 /* The following command puts the iPod into a deep sleep.  Warning
  71    from the good people of ipodlinux - never issue this command
  72    without setting CHGWAK or EXTONWAK if you ever want to be able to
  73    power on your iPod again. */
  74 void pcf50605_standby_mode(void)
  75 {
  76     pcf50605_write(PCF5060X_OOCC1,
  77                    GOSTDBY | CHGWAK | EXTONWAK | pcf50605_wakeup_flags);
  78 }
  79
  80 void pcf50605_init(void)
  81 {
  82 #if (defined (IPOD_VIDEO) || defined (IPOD_NANO))
  83     /* I/O and GPO voltage supply. ECO not allowed regarding data sheet. Defaults:
  84      * iPod Video = 0xf8 = 3.3V ON
  85      * iPod nano  = 0xf5 = 3.0V ON */
  86     pcf50605_write(PCF5060X_IOREGC,  0xf5); /* 3.0V ON */
  87
  88     /* Core voltage supply. ECO not stable, assumed due to less precision of
  89      * voltage in ECO mode. DCDC2 is not relevant as this may be used for
  90      * voltage scaling. Default is 1.2V ON for PP5022/PP5024 */
  91     pcf50605_write(PCF5060X_DCDC1,   0xec); /* 1.2V ON */
  92     pcf50605_write(PCF5060X_DCDC2,   0x0c); /* OFF */
  93
  94     /* Unknown. Defaults:
  95      * iPod Video = 0xe3 = 1.8V ON
  96      * iPod nano  = 0xe3 = 1.8V ON */
  97     pcf50605_write(PCF5060X_DCUDC1,  0xe3); /* 1.8V ON */
  98
  99     /* Codec voltage supply. ECO not allowed as max. current of 5mA is not
 100      * sufficient. Defaults:
 101      * iPod Video = 0xf5 = 3.0V ON
 102      * iPod nano  = 0xef = 2.4V ON */
 103     pcf50605_write(PCF5060X_D1REGC1, 0xf0); /* 2.5V ON */
 104
 105     /* PCF5060X_D2REGC1 is set in accordance to the accessory power setting */
 106
 107 #if  defined (IPOD_VIDEO)
 108     /* LCD voltage supply. Defaults:
 109      * iPod Video = 0xf5 = 3.0V ON */
 110     pcf50605_write(PCF5060X_D3REGC1, 0xf1); /* 2.6V ON */
 111 #elif defined (IPOD_NANO)
 112     /* D3REGC has effect on LCD and ATA, leave it unchanged due to possible ATA
 113      * failures. Defaults:
 114      * iPod nano  = 0xf5 = 3.0V ON */
 115     pcf50605_write(PCF5060X_D3REGC1, 0xf5); /* 3.0V ON */
 116 #endif
 117
 118     /* PCF5060X_LPREGC1 is leaved untouched as the setting varies over the
 119      * different iPod platforms. Defaults:
 120      * iPod Video = 0x1f = 0ff
 121      * iPod nano  = 0xf6 = 3.1V ON */
 122 #else
 123     /* keep initialization from svn for other iPods */
 124     pcf50605_write(PCF5060X_D1REGC1, 0xf5); /* 3.0V ON */
 125     pcf50605_write(PCF5060X_D3REGC1, 0xf5); /* 3.0V ON */
 126 #endif
 127 }