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/*
* Copyright (c) 2013 The Chromium OS Authors.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <cros_ec.h>
#include <errno.h>
#include <power/tps65090_pmic.h>
DECLARE_GLOBAL_DATA_PTR;
#define TPS65090_ADDR 0x48
static struct tps65090 {
struct cros_ec_dev *dev; /* The CROS_EC device */
} config;
/* TPS65090 register addresses */
enum {
REG_IRQ1 = 0,
REG_CG_CTRL0 = 4,
REG_CG_STATUS1 = 0xa,
REG_FET1_CTRL = 0x0f,
REG_FET2_CTRL,
REG_FET3_CTRL,
REG_FET4_CTRL,
REG_FET5_CTRL,
REG_FET6_CTRL,
REG_FET7_CTRL,
TPS65090_NUM_REGS,
};
enum {
IRQ1_VBATG = 1 << 3,
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 */
};
/**
* tps65090_read - read a byte from tps6090
*
* @param reg The register address to read from.
* @param val We'll return value value read here.
* @return 0 if ok; error if EC returns failure.
*/
static int tps65090_read(u32 reg, u8 *val)
{
return cros_ec_i2c_xfer(config.dev, TPS65090_ADDR, reg, 1,
val, 1, true);
}
/**
* tps65090_write - write a byte to tps6090
*
* @param reg The register address to write to.
* @param val The value to write.
* @return 0 if ok; error if EC returns failure.
*/
static int tps65090_write(u32 reg, u8 val)
{
return cros_ec_i2c_xfer(config.dev, TPS65090_ADDR, reg, 1,
&val, 1, false);
}
/**
* Checks for a valid FET number
*
* @param fet_id FET number to check
* @return 0 if ok, -EINVAL if FET value is out of range
*/
static int tps65090_check_fet(unsigned int fet_id)
{
if (fet_id == 0 || fet_id > MAX_FET_NUM) {
debug("parameter fet_id is out of range, %u not in 1 ~ %u\n",
fet_id, MAX_FET_NUM);
return -EINVAL;
}
return 0;
}
/**
* Set the power state for a FET
*
* @param fet_id Fet number to set (1..MAX_FET_NUM)
* @param set 1 to power on FET, 0 to power off
* @return -EIO if we got a comms error, -EAGAIN if the FET failed to
* change state. If all is ok, returns 0.
*/
static int tps65090_fet_set(int fet_id, bool set)
{
int retry;
u8 reg, value;
value = FET_CTRL_ADENFET | FET_CTRL_WAIT;
if (set)
value |= FET_CTRL_ENFET;
if (tps65090_write(REG_FET1_CTRL + fet_id - 1, value))
return -EIO;
/* Try reading until we get a result */
for (retry = 0; retry < MAX_CTRL_READ_TRIES; retry++) {
if (tps65090_read(REG_FET1_CTRL + fet_id - 1, ®))
return -EIO;
/* 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;
mdelay(1);
}
debug("FET %d: Power good should have set to %d but reg=%#02x\n",
fet_id, set, reg);
return -EAGAIN;
}
int tps65090_fet_enable(unsigned int fet_id)
{
ulong start;
int loops;
int ret;
ret = tps65090_check_fet(fet_id);
if (ret)
return ret;
start = get_timer(0);
for (loops = 0;; loops++) {
ret = tps65090_fet_set(fet_id, true);
if (!ret)
break;
if (get_timer(start) > 100)
break;
/* Turn it off and try again until we time out */
tps65090_fet_set(fet_id, false);
}
if (ret) {
debug("%s: FET%d failed to power on: time=%lums, loops=%d\n",
__func__, fet_id, get_timer(start), loops);
} else if (loops) {
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 == -EAGAIN)
ret = 0;
return ret;
}
int tps65090_fet_disable(unsigned int fet_id)
{
int ret;
ret = tps65090_check_fet(fet_id);
if (ret)
return ret;
ret = tps65090_fet_set(fet_id, false);
return ret;
}
int tps65090_fet_is_enabled(unsigned int fet_id)
{
u8 reg = 0;
int ret;
ret = tps65090_check_fet(fet_id);
if (ret)
return ret;
ret = tps65090_read(REG_FET1_CTRL + fet_id - 1, ®);
if (ret) {
debug("fail to read FET%u_CTRL register over I2C", fet_id);
return -EIO;
}
return reg & FET_CTRL_ENFET;
}
int tps65090_init(void)
{
puts("TPS65090 PMIC EC init\n");
config.dev = board_get_cros_ec_dev();
if (!config.dev) {
debug("%s: no cros_ec device: cannot init tps65090\n",
__func__);
return -ENODEV;
}
return 0;
}
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