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/*
* Copyright 2012, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*/
#include <delay.h>
#include <types.h>
#include <console/console.h>
#include <device/i2c.h>
#include "tps65090.h"
/* TPS65090 register addresses */
enum {
REG_CG_CTRL0 = 4,
REG_CG_STATUS1 = 0xa,
};
enum {
CG_CTRL0_ENC_MASK = 0x01,
MAX_FET_NUM = 7,
MAX_CTRL_READ_TRIES = 5,
/* TPS65090 FET_CTRL register values */
FET_CTRL_TOFET = 1 << 7, /* Timeout, startup, overload */
FET_CTRL_PGFET = 1 << 4, /* Power good for FET status */
FET_CTRL_WAIT = 3 << 2, /* Overcurrent timeout max */
FET_CTRL_ADENFET = 1 << 1, /* Enable output auto discharge */
FET_CTRL_ENFET = 1 << 0, /* Enable FET */
};
static int tps65090_i2c_write(unsigned int bus,
unsigned int reg_addr, unsigned char value)
{
int ret;
ret = i2c_writeb(bus, TPS65090_I2C_ADDR, reg_addr, value);
printk(BIOS_DEBUG, "%s: reg=%#x, value=%#x, ret=%d\n",
__func__, reg_addr, value, ret);
return ret;
}
static int tps65090_i2c_read(unsigned int bus,
unsigned int reg_addr, unsigned char *value)
{
int ret;
printk(BIOS_DEBUG, "%s: reg=%#x, ", __func__, reg_addr);
ret = i2c_readb(bus, TPS65090_I2C_ADDR, reg_addr, value);
if (ret)
printk(BIOS_DEBUG, "fail, ret=%d\n", ret);
else
printk(BIOS_DEBUG, "value=%#x, ret=%d\n", *value, ret);
return ret;
}
/**
* Set the power state for a FET
*
* @param bus
* @param fet_id Fet number to set (1..MAX_FET_NUM)
* @param set 1 to power on FET, 0 to power off
* @return FET_ERR_COMMS if we got a comms error, FET_ERR_NOT_READY if the
* FET failed to change state. If all is ok, returns 0.
*/
static int tps65090_fet_set(unsigned int bus, enum fet_id fet_id, int set)
{
int retry, value;
uint8_t reg;
value = FET_CTRL_ADENFET | FET_CTRL_WAIT;
if (set)
value |= FET_CTRL_ENFET;
if (tps65090_i2c_write(bus, fet_id, value))
return FET_ERR_COMMS;
/* Try reading until we get a result */
for (retry = 0; retry < MAX_CTRL_READ_TRIES; retry++) {
if (tps65090_i2c_read(bus, fet_id, ®))
return FET_ERR_COMMS;
/* Check that the fet went into the expected state */
if (!!(reg & FET_CTRL_PGFET) == set)
return 0;
/* If we got a timeout, there is no point in waiting longer */
if (reg & FET_CTRL_TOFET)
break;
udelay(1000);
}
printk(BIOS_DEBUG, "FET %d: Power good should have set to %d but "
"reg=%#02x\n", fet_id, set, reg);
return FET_ERR_NOT_READY;
}
/* FIXME(dhendrix): add timer API */
#if 0
int tps65090_fet_enable(unsigned int bus, enum fet_id fet_id)
{
int loops;
unsigned long start;
int ret = 0;
start = get_timer(0);
for (loops = 0; ; loops++) {
ret = tps65090_fet_set(bus, fet_id, 1);
if (!ret)
break;
if (get_timer(start) > 100)
break;
/* Turn it off and try again until we time out */
tps65090_fet_set(bus, fet_id, 0);
}
if (ret) {
printk(BIOS_DEBUG, "%s: FET%d failed to power on: time=%lums, "
"loops=%d\n", __func__, fet_id,
get_timer(start), loops);
} else if (loops) {
printk(BIOS_DEBUG, "%s: FET%d powered on after %lums, "
"loops=%d\n", __func__, fet_id,
get_timer(start), loops);
}
/*
* Unfortunately, there are some conditions where the power
* good bit will be 0, but the fet still comes up. One such
* case occurs with the lcd backlight. We'll just return 0 here
* and assume that the fet will eventually come up.
*/
if (ret == FET_ERR_NOT_READY)
ret = 0;
return ret;
}
#endif
int tps65090_fet_enable(unsigned int bus, enum fet_id fet_id)
{
int loops;
int ret = 0;
for (loops = 0; loops < 100; loops++) {
ret = tps65090_fet_set(bus, fet_id, 1);
if (!ret)
break;
/* Turn it off and try again until we time out */
tps65090_fet_set(bus, fet_id, 0);
udelay(1000);
}
if (ret) {
printk(BIOS_DEBUG, "%s: FET%d failed to power on\n",
__func__, fet_id);
} else if (loops) {
printk(BIOS_DEBUG, "%s: FET%d powered on\n",
__func__, fet_id);
}
/*
* Unfortunately, there are some conditions where the power
* good bit will be 0, but the fet still comes up. One such
* case occurs with the lcd backlight. We'll just return 0 here
* and assume that the fet will eventually come up.
*/
if (ret == FET_ERR_NOT_READY)
ret = 0;
return ret;
}
int tps65090_fet_disable(unsigned int bus, enum fet_id fet_id)
{
return tps65090_fet_set(bus, fet_id, 0);
}
int tps65090_fet_is_enabled(unsigned int bus, enum fet_id fet_id)
{
unsigned char reg;
int ret;
ret = tps65090_i2c_read(bus, fet_id, ®);
if (ret) {
printk(BIOS_DEBUG, "fail to read FET%u_CTRL", fet_id);
return -2;
}
return reg & FET_CTRL_ENFET;
}
int tps65090_is_charging(unsigned int bus)
{
unsigned char val;
int ret;
ret = tps65090_i2c_read(bus, REG_CG_CTRL0, &val);
if (ret)
return ret;
return val & CG_CTRL0_ENC_MASK ? 1 : 0;
}
int tps65090_set_charge_enable(unsigned int bus, int enable)
{
unsigned char val;
int ret;
ret = tps65090_i2c_read(bus, REG_CG_CTRL0, &val);
if (!ret) {
if (enable)
val |= CG_CTRL0_ENC_MASK;
else
val &= ~CG_CTRL0_ENC_MASK;
ret = tps65090_i2c_write(bus, REG_CG_CTRL0, val);
}
if (ret) {
printk(BIOS_DEBUG, "%s: Failed to enable\n", __func__);
return ret;
}
return 0;
}
int tps65090_get_status(unsigned int bus)
{
unsigned char val;
int ret;
ret = tps65090_i2c_read(bus, REG_CG_STATUS1, &val);
if (ret)
return ret;
return val;
}
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