mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-06 13:14:27 +00:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) 2015 Google, Inc
|
|
*/
|
|
|
|
#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,
|
|
};
|