firmware/target/arm/s5l8700/yps3/power-yps3.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright © 2009 Bertrik Sikken
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  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 <stdbool.h>
  22 #include "config.h"
  23 #include "s5l8700.h"
  24 #include "power.h"
  25
  26 /*  Power handling for the S5L8700 based Samsung YP-S3
  27
  28     Pins involved in power management:
  29     * P0.1: stay powered up (even with the USB cable unplugged)
  30     * P1.1: USB power detect
  31     * P4.7: tuner power/enable
  32     * P5.2: unknown output
  33     * P5.3: unknown output, related to charging (perhaps charge current?)
  34     * P5.4: charge status input (only valid if charger enabled)
  35     * P5.6: charger enable
  36 */
  37
  38 void power_off(void)
  39 {
  40     /* take down P0.1 to power off (plugged USB cable overrides this though) */
  41     PDAT0 &= ~(1 << 1);
  42
  43     while(1); /* wait for system to shut down */
  44 }
  45
  46 void power_init(void)
  47 {
  48     /* configure P0.1 as output for power-up and stay powered up */
  49     PCON0 = (PCON0 & ~(3 << 2)) | (1 << 2);
  50     PDAT0 |= (1 << 1);
  51
  52     /* configure P1.1 as input for USB power detect */
  53     PCON1 = (PCON1 & ~0x000000F0) | 0x00000000;
  54
  55     /* configure P4.7 as output for tuner power and turn power off */
  56     PCON4 = (PCON4 & ~0xF0000000) | 0x10000000;
  57     PDAT4 &= ~(1 << 7);
  58
  59     /* configure P5.2 / P5.3 / P5.6 as output, P5.4 as input */
  60     PCON5 = (PCON5 & ~0x0F0FFF00) | 0x01001100;
  61     PDAT5 &= ~((1 << 2) | (1 << 3) | (1 << 6));
  62 }
  63
  64 #if CONFIG_CHARGING
  65 unsigned int power_input_status(void)
  66 {
  67     /* check USB power on P1.1 */
  68     if (PDAT1 & (1 << 1)) {
  69         return POWER_INPUT_USB;
  70     }
  71
  72     return POWER_INPUT_NONE;
  73 }
  74
  75 bool charging_state(void)
  76 {
  77     /* check if charger is enabled */
  78     if (PDAT5 & (1 << 6)) {
  79         /* check if charging is busy */
  80         return (PDAT5 & (1 << 4));
  81     }
  82     return false;
  83 }
  84 #endif /* CONFIG_CHARGING */
  85
  86 #if CONFIG_TUNER
  87 bool tuner_power(bool status)
  88 {
  89     if (status) {
  90         PDAT4 |= (1 << 7);
  91     }
  92     else {
  93         PDAT4 &= ~(1 << 7);
  94     }
  95     /* TODO what should we return here? */
  96     return status;
  97 }
  98
  99 bool tuner_powered(void)
 100 {
 101     return (PDAT4 & (1 << 7));
 102 }
 103 #endif /* CONFIG_TUNER */
 104