469d645390
When the bootloader starts only IRAM is available, the first task is to ask the PMU to verify if the iPod has previously been hibernated by OF. Due to memory limitations, the kernel cannot be used on this stage. This patch modifies I2C and PMU low level functions to not to depend on kernel (removes mutexes, and uses HW timer instead of current_tick), actual kernel functions are modified to be 'mutexed' wrappers of the new functions. Change-Id: I7cef9e95dedaf176dc0659315f3dc33166d5b116
168 lines
3.8 KiB
C
168 lines
3.8 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id: pmu-nano2g.c 27752 2010-08-08 10:49:32Z bertrik $
|
|
*
|
|
* Copyright © 2008 Rafaël Carré
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include "config.h"
|
|
#include "kernel.h"
|
|
#include "i2c-s5l8702.h"
|
|
#include "pmu-target.h"
|
|
|
|
static struct mutex pmu_adc_mutex;
|
|
|
|
int pmu_read_multiple(int address, int count, unsigned char* buffer)
|
|
{
|
|
return i2c_read(0, 0xe6, address, count, buffer);
|
|
}
|
|
|
|
int pmu_write_multiple(int address, int count, unsigned char* buffer)
|
|
{
|
|
return i2c_write(0, 0xe6, address, count, buffer);
|
|
}
|
|
|
|
unsigned char pmu_read(int address)
|
|
{
|
|
unsigned char tmp;
|
|
|
|
pmu_read_multiple(address, 1, &tmp);
|
|
|
|
return tmp;
|
|
}
|
|
|
|
int pmu_write(int address, unsigned char val)
|
|
{
|
|
return pmu_write_multiple(address, 1, &val);
|
|
}
|
|
|
|
void pmu_init(void)
|
|
{
|
|
mutex_init(&pmu_adc_mutex);
|
|
}
|
|
|
|
int pmu_read_adc(unsigned int adc)
|
|
{
|
|
int data = 0;
|
|
mutex_lock(&pmu_adc_mutex);
|
|
pmu_write(0x54, 5 | (adc << 4));
|
|
while ((data & 0x80) == 0)
|
|
{
|
|
yield();
|
|
data = pmu_read(0x57);
|
|
}
|
|
int value = (pmu_read(0x55) << 2) | (data & 3);
|
|
mutex_unlock(&pmu_adc_mutex);
|
|
return value;
|
|
}
|
|
|
|
/* millivolts */
|
|
int pmu_read_battery_voltage(void)
|
|
{
|
|
return (pmu_read_adc(1) * 2000 / 1023) + 2250;
|
|
}
|
|
|
|
/* milliamps */
|
|
int pmu_read_battery_current(void)
|
|
{
|
|
//TODO: Figure out how to read the battery current
|
|
// return pmu_read_adc(2);
|
|
return 0;
|
|
}
|
|
|
|
void pmu_ldo_on_in_standby(unsigned int ldo, int onoff)
|
|
{
|
|
if (ldo < 4)
|
|
{
|
|
unsigned char newval = pmu_read(0x3B) & ~(1 << (2 * ldo));
|
|
if (onoff) newval |= 1 << (2 * ldo);
|
|
pmu_write(0x3B, newval);
|
|
}
|
|
else if (ldo < 8)
|
|
{
|
|
unsigned char newval = pmu_read(0x3C) & ~(1 << (2 * (ldo - 4)));
|
|
if (onoff) newval |= 1 << (2 * (ldo - 4));
|
|
pmu_write(0x3C, newval);
|
|
}
|
|
}
|
|
|
|
void pmu_ldo_set_voltage(unsigned int ldo, unsigned char voltage)
|
|
{
|
|
if (ldo > 6) return;
|
|
pmu_write(0x2d + (ldo << 1), voltage);
|
|
}
|
|
|
|
void pmu_hdd_power(bool on)
|
|
{
|
|
pmu_write(0x1b, on ? 1 : 0);
|
|
}
|
|
|
|
void pmu_ldo_power_on(unsigned int ldo)
|
|
{
|
|
if (ldo > 6) return;
|
|
pmu_write(0x2e + (ldo << 1), 1);
|
|
}
|
|
|
|
void pmu_ldo_power_off(unsigned int ldo)
|
|
{
|
|
if (ldo > 6) return;
|
|
pmu_write(0x2e + (ldo << 1), 0);
|
|
}
|
|
|
|
void pmu_set_wake_condition(unsigned char condition)
|
|
{
|
|
pmu_write(0xd, condition);
|
|
}
|
|
|
|
void pmu_enter_standby(void)
|
|
{
|
|
pmu_write(0xc, 1);
|
|
}
|
|
|
|
void pmu_read_rtc(unsigned char* buffer)
|
|
{
|
|
pmu_read_multiple(0x59, 7, buffer);
|
|
}
|
|
|
|
void pmu_write_rtc(unsigned char* buffer)
|
|
{
|
|
pmu_write_multiple(0x59, 7, buffer);
|
|
}
|
|
|
|
#ifdef BOOTLOADER
|
|
int pmu_rd_multiple(int address, int count, unsigned char* buffer)
|
|
{
|
|
return i2c_rd(0, 0xe6, address, count, buffer);
|
|
}
|
|
|
|
int pmu_wr_multiple(int address, int count, unsigned char* buffer)
|
|
{
|
|
return i2c_wr(0, 0xe6, address, count, buffer);
|
|
}
|
|
|
|
unsigned char pmu_rd(int address)
|
|
{
|
|
unsigned char val;
|
|
pmu_rd_multiple(address, 1, &val);
|
|
return val;
|
|
}
|
|
|
|
int pmu_wr(int address, unsigned char val)
|
|
{
|
|
return pmu_wr_multiple(address, 1, &val);
|
|
}
|
|
#endif /* BOOTLOADER */
|