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/*
* Copyright (c) 2015 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <power/pmic.h>
#include <power/regulator.h>
#include <power/tps65090.h>
static int tps65090_fet_probe(struct udevice *dev)
{
struct dm_regulator_uclass_platdata *uc_pdata;
uc_pdata = dev_get_uclass_platdata(dev);
uc_pdata->type = REGULATOR_TYPE_OTHER;
uc_pdata->mode_count = 0;
return 0;
}
static int tps65090_fet_get_enable(struct udevice *dev)
{
struct udevice *pmic = dev_get_parent(dev);
int ret, fet_id;
fet_id = dev->driver_data;
debug("%s: fet_id=%d\n", __func__, fet_id);
ret = pmic_reg_read(pmic, REG_FET_BASE + fet_id);
if (ret < 0)
return ret;
return ret & FET_CTRL_ENFET;
}
/**
* Set the power state for a FET
*
* @param pmic pmic structure for the tps65090
* @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(struct udevice *pmic, int fet_id, bool set)
{
int retry;
u32 value;
int ret;
value = FET_CTRL_ADENFET | FET_CTRL_WAIT;
if (set)
value |= FET_CTRL_ENFET;
if (pmic_reg_write(pmic, REG_FET_BASE + fet_id, value))
return -EIO;
/* Try reading until we get a result */
for (retry = 0; retry < MAX_CTRL_READ_TRIES; retry++) {
ret = pmic_reg_read(pmic, REG_FET_BASE + fet_id);
if (ret < 0)
return ret;
/* Check that the FET went into the expected state */
debug("%s: flags=%x\n", __func__, ret);
if (!!(ret & FET_CTRL_PGFET) == set)
return 0;
/* If we got a timeout, there is no point in waiting longer */
if (ret & FET_CTRL_TOFET)
break;
mdelay(1);
}
debug("FET %d: Power good should have set to %d but reg=%#02x\n",
fet_id, set, ret);
return -EAGAIN;
}
static int tps65090_fet_set_enable(struct udevice *dev, bool enable)
{
struct udevice *pmic = dev_get_parent(dev);
int ret, fet_id;
ulong start;
int loops;
fet_id = dev->driver_data;
debug("%s: fet_id=%d, enable=%d\n", __func__, fet_id, enable);
start = get_timer(0);
for (loops = 0;; loops++) {
ret = tps65090_fet_set(pmic, fet_id, enable);
if (!ret)
break;
if (get_timer(start) > 100)
break;
/* Turn it off and try again until we time out */
tps65090_fet_set(pmic, 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 on snow. We'll just return 0 here and assume
* that the FET will eventually come up.
*/
if (ret == -EAGAIN)
ret = 0;
return ret;
}
static const struct dm_regulator_ops tps65090_fet_ops = {
.get_enable = tps65090_fet_get_enable,
.set_enable = tps65090_fet_set_enable,
};
U_BOOT_DRIVER(tps65090_fet) = {
.name = TPS65090_FET_DRIVER,
.id = UCLASS_REGULATOR,
.ops = &tps65090_fet_ops,
.probe = tps65090_fet_probe,
};
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