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u-boot/drivers/power/regulator/regulator-uclass.c
Konstantin Porotchkin fec8c900c8 power: regulator: Add support for regulator-force-boot-off 
Add support for regulator-force-boot-off DT property.
This property can be used by the board/device drivers for
turning off regulators on early init stages as pre-requisite
for the other components initialization.

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
2021-04-29 07:38:57 +02:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2014-2015 Samsung Electronics
* Przemyslaw Marczak <p.marczak@samsung.com>
*/
#include <common.h>
#include <errno.h>
#include <dm.h>
#include <log.h>
#include <dm/uclass-internal.h>
#include <linux/delay.h>
#include <power/pmic.h>
#include <power/regulator.h>
int regulator_mode(struct udevice *dev, struct dm_regulator_mode **modep)
{
struct dm_regulator_uclass_plat *uc_pdata;
*modep = NULL;
uc_pdata = dev_get_uclass_plat(dev);
if (!uc_pdata)
return -ENXIO;
*modep = uc_pdata->mode;
return uc_pdata->mode_count;
}
int regulator_get_value(struct udevice *dev)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops || !ops->get_value)
return -ENOSYS;
return ops->get_value(dev);
}
static void regulator_set_value_ramp_delay(struct udevice *dev, int old_uV,
int new_uV, unsigned int ramp_delay)
{
int delay = DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
debug("regulator %s: delay %u us (%d uV -> %d uV)\n", dev->name, delay,
old_uV, new_uV);
udelay(delay);
}
int regulator_set_value(struct udevice *dev, int uV)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
struct dm_regulator_uclass_plat *uc_pdata;
int ret, old_uV = uV, is_enabled = 0;
uc_pdata = dev_get_uclass_plat(dev);
if (uc_pdata->min_uV != -ENODATA && uV < uc_pdata->min_uV)
return -EINVAL;
if (uc_pdata->max_uV != -ENODATA && uV > uc_pdata->max_uV)
return -EINVAL;
if (!ops || !ops->set_value)
return -ENOSYS;
if (uc_pdata->ramp_delay) {
is_enabled = regulator_get_enable(dev);
old_uV = regulator_get_value(dev);
}
ret = ops->set_value(dev, uV);
if (!ret) {
if (uc_pdata->ramp_delay && old_uV > 0 && is_enabled)
regulator_set_value_ramp_delay(dev, old_uV, uV,
uc_pdata->ramp_delay);
}
return ret;
}
int regulator_set_suspend_value(struct udevice *dev, int uV)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
struct dm_regulator_uclass_plat *uc_pdata;
uc_pdata = dev_get_uclass_plat(dev);
if (uc_pdata->min_uV != -ENODATA && uV < uc_pdata->min_uV)
return -EINVAL;
if (uc_pdata->max_uV != -ENODATA && uV > uc_pdata->max_uV)
return -EINVAL;
if (!ops->set_suspend_value)
return -ENOSYS;
return ops->set_suspend_value(dev, uV);
}
int regulator_get_suspend_value(struct udevice *dev)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops->get_suspend_value)
return -ENOSYS;
return ops->get_suspend_value(dev);
}
/*
* To be called with at most caution as there is no check
* before setting the actual voltage value.
*/
int regulator_set_value_force(struct udevice *dev, int uV)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops || !ops->set_value)
return -ENOSYS;
return ops->set_value(dev, uV);
}
int regulator_get_current(struct udevice *dev)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops || !ops->get_current)
return -ENOSYS;
return ops->get_current(dev);
}
int regulator_set_current(struct udevice *dev, int uA)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
struct dm_regulator_uclass_plat *uc_pdata;
uc_pdata = dev_get_uclass_plat(dev);
if (uc_pdata->min_uA != -ENODATA && uA < uc_pdata->min_uA)
return -EINVAL;
if (uc_pdata->max_uA != -ENODATA && uA > uc_pdata->max_uA)
return -EINVAL;
if (!ops || !ops->set_current)
return -ENOSYS;
return ops->set_current(dev, uA);
}
int regulator_get_enable(struct udevice *dev)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops || !ops->get_enable)
return -ENOSYS;
return ops->get_enable(dev);
}
int regulator_set_enable(struct udevice *dev, bool enable)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
struct dm_regulator_uclass_plat *uc_pdata;
int ret, old_enable = 0;
if (!ops || !ops->set_enable)
return -ENOSYS;
uc_pdata = dev_get_uclass_plat(dev);
if (!enable && uc_pdata->always_on)
return -EACCES;
if (uc_pdata->ramp_delay)
old_enable = regulator_get_enable(dev);
ret = ops->set_enable(dev, enable);
if (!ret) {
if (uc_pdata->ramp_delay && !old_enable && enable) {
int uV = regulator_get_value(dev);
if (uV > 0) {
regulator_set_value_ramp_delay(dev, 0, uV,
uc_pdata->ramp_delay);
}
}
}
return ret;
}
int regulator_set_enable_if_allowed(struct udevice *dev, bool enable)
{
int ret;
ret = regulator_set_enable(dev, enable);
if (ret == -ENOSYS || ret == -EACCES)
return 0;
return ret;
}
int regulator_set_suspend_enable(struct udevice *dev, bool enable)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops->set_suspend_enable)
return -ENOSYS;
return ops->set_suspend_enable(dev, enable);
}
int regulator_get_suspend_enable(struct udevice *dev)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops->get_suspend_enable)
return -ENOSYS;
return ops->get_suspend_enable(dev);
}
int regulator_get_mode(struct udevice *dev)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops || !ops->get_mode)
return -ENOSYS;
return ops->get_mode(dev);
}
int regulator_set_mode(struct udevice *dev, int mode)
{
const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
if (!ops || !ops->set_mode)
return -ENOSYS;
return ops->set_mode(dev, mode);
}
int regulator_get_by_platname(const char *plat_name, struct udevice **devp)
{
struct dm_regulator_uclass_plat *uc_pdata;
struct udevice *dev;
int ret;
*devp = NULL;
for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev;
ret = uclass_find_next_device(&dev)) {
if (ret) {
debug("regulator %s, ret=%d\n", dev->name, ret);
continue;
}
uc_pdata = dev_get_uclass_plat(dev);
if (!uc_pdata || strcmp(plat_name, uc_pdata->name))
continue;
return uclass_get_device_tail(dev, 0, devp);
}
debug("%s: can't find: %s, ret=%d\n", __func__, plat_name, ret);
return -ENODEV;
}
int regulator_get_by_devname(const char *devname, struct udevice **devp)
{
return uclass_get_device_by_name(UCLASS_REGULATOR, devname, devp);
}
int device_get_supply_regulator(struct udevice *dev, const char *supply_name,
struct udevice **devp)
{
return uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
supply_name, devp);
}
int regulator_autoset(struct udevice *dev)
{
struct dm_regulator_uclass_plat *uc_pdata;
int ret = 0;
uc_pdata = dev_get_uclass_plat(dev);
ret = regulator_set_suspend_enable(dev, uc_pdata->suspend_on);
if (!ret && uc_pdata->suspend_on) {
ret = regulator_set_suspend_value(dev, uc_pdata->suspend_uV);
if (!ret)
return ret;
}
if (!uc_pdata->always_on && !uc_pdata->boot_on)
return -EMEDIUMTYPE;
if (uc_pdata->type == REGULATOR_TYPE_FIXED)
return regulator_set_enable(dev, true);
if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UV)
ret = regulator_set_value(dev, uc_pdata->min_uV);
if (uc_pdata->init_uV > 0)
ret = regulator_set_value(dev, uc_pdata->init_uV);
if (!ret && (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UA))
ret = regulator_set_current(dev, uc_pdata->min_uA);
if (!ret)
ret = regulator_set_enable(dev, true);
return ret;
}
int regulator_unset(struct udevice *dev)
{
struct dm_regulator_uclass_plat *uc_pdata;
uc_pdata = dev_get_uclass_plat(dev);
if (uc_pdata && uc_pdata->force_off)
return regulator_set_enable(dev, false);
return -EMEDIUMTYPE;
}
static void regulator_show(struct udevice *dev, int ret)
{
struct dm_regulator_uclass_plat *uc_pdata;
uc_pdata = dev_get_uclass_plat(dev);
printf("%s@%s: ", dev->name, uc_pdata->name);
if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UV)
printf("set %d uV", uc_pdata->min_uV);
if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UA)
printf("; set %d uA", uc_pdata->min_uA);
printf("; enabling");
if (ret)
printf(" (ret: %d)", ret);
printf("\n");
}
int regulator_autoset_by_name(const char *platname, struct udevice **devp)
{
struct udevice *dev;
int ret;
ret = regulator_get_by_platname(platname, &dev);
if (devp)
*devp = dev;
if (ret) {
debug("Can get the regulator: %s (err=%d)\n", platname, ret);
return ret;
}
return regulator_autoset(dev);
}
int regulator_list_autoset(const char *list_platname[],
struct udevice *list_devp[],
bool verbose)
{
struct udevice *dev;
int error = 0, i = 0, ret;
while (list_platname[i]) {
ret = regulator_autoset_by_name(list_platname[i], &dev);
if (ret != -EMEDIUMTYPE && verbose)
regulator_show(dev, ret);
if (ret & !error)
error = ret;
if (list_devp)
list_devp[i] = dev;
i++;
}
return error;
}
static bool regulator_name_is_unique(struct udevice *check_dev,
const char *check_name)
{
struct dm_regulator_uclass_plat *uc_pdata;
struct udevice *dev;
int check_len = strlen(check_name);
int ret;
int len;
for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev;
ret = uclass_find_next_device(&dev)) {
if (ret || dev == check_dev)
continue;
uc_pdata = dev_get_uclass_plat(dev);
len = strlen(uc_pdata->name);
if (len != check_len)
continue;
if (!strcmp(uc_pdata->name, check_name))
return false;
}
return true;
}
static int regulator_post_bind(struct udevice *dev)
{
struct dm_regulator_uclass_plat *uc_pdata;
const char *property = "regulator-name";
uc_pdata = dev_get_uclass_plat(dev);
/* Regulator's mandatory constraint */
uc_pdata->name = dev_read_string(dev, property);
if (!uc_pdata->name) {
debug("%s: dev '%s' has no property '%s'\n",
__func__, dev->name, property);
uc_pdata->name = dev_read_name(dev);
if (!uc_pdata->name)
return -EINVAL;
}
if (regulator_name_is_unique(dev, uc_pdata->name))
return 0;
debug("'%s' of dev: '%s', has nonunique value: '%s\n",
property, dev->name, uc_pdata->name);
return -EINVAL;
}
static int regulator_pre_probe(struct udevice *dev)
{
struct dm_regulator_uclass_plat *uc_pdata;
ofnode node;
uc_pdata = dev_get_uclass_plat(dev);
if (!uc_pdata)
return -ENXIO;
/* Regulator's optional constraints */
uc_pdata->min_uV = dev_read_u32_default(dev, "regulator-min-microvolt",
-ENODATA);
uc_pdata->max_uV = dev_read_u32_default(dev, "regulator-max-microvolt",
-ENODATA);
uc_pdata->init_uV = dev_read_u32_default(dev, "regulator-init-microvolt",
-ENODATA);
uc_pdata->min_uA = dev_read_u32_default(dev, "regulator-min-microamp",
-ENODATA);
uc_pdata->max_uA = dev_read_u32_default(dev, "regulator-max-microamp",
-ENODATA);
uc_pdata->always_on = dev_read_bool(dev, "regulator-always-on");
uc_pdata->boot_on = dev_read_bool(dev, "regulator-boot-on");
uc_pdata->ramp_delay = dev_read_u32_default(dev, "regulator-ramp-delay",
0);
uc_pdata->force_off = dev_read_bool(dev, "regulator-force-boot-off");
node = dev_read_subnode(dev, "regulator-state-mem");
if (ofnode_valid(node)) {
uc_pdata->suspend_on = !ofnode_read_bool(node, "regulator-off-in-suspend");
if (ofnode_read_u32(node, "regulator-suspend-microvolt", &uc_pdata->suspend_uV))
uc_pdata->suspend_uV = uc_pdata->max_uV;
} else {
uc_pdata->suspend_on = true;
uc_pdata->suspend_uV = uc_pdata->max_uV;
}
/* Those values are optional (-ENODATA if unset) */
if ((uc_pdata->min_uV != -ENODATA) &&
(uc_pdata->max_uV != -ENODATA) &&
(uc_pdata->min_uV == uc_pdata->max_uV))
uc_pdata->flags |= REGULATOR_FLAG_AUTOSET_UV;
/* Those values are optional (-ENODATA if unset) */
if ((uc_pdata->min_uA != -ENODATA) &&
(uc_pdata->max_uA != -ENODATA) &&
(uc_pdata->min_uA == uc_pdata->max_uA))
uc_pdata->flags |= REGULATOR_FLAG_AUTOSET_UA;
return 0;
}
int regulators_enable_boot_on(bool verbose)
{
struct udevice *dev;
struct uclass *uc;
int ret;
ret = uclass_get(UCLASS_REGULATOR, &uc);
if (ret)
return ret;
for (uclass_first_device(UCLASS_REGULATOR, &dev);
dev;
uclass_next_device(&dev)) {
ret = regulator_autoset(dev);
if (ret == -EMEDIUMTYPE) {
ret = 0;
continue;
}
if (verbose)
regulator_show(dev, ret);
if (ret == -ENOSYS)
ret = 0;
}
return ret;
}
int regulators_enable_boot_off(bool verbose)
{
struct udevice *dev;
struct uclass *uc;
int ret;
ret = uclass_get(UCLASS_REGULATOR, &uc);
if (ret)
return ret;
for (uclass_first_device(UCLASS_REGULATOR, &dev);
dev;
uclass_next_device(&dev)) {
ret = regulator_unset(dev);
if (ret == -EMEDIUMTYPE) {
ret = 0;
continue;
}
if (verbose)
regulator_show(dev, ret);
if (ret == -ENOSYS)
ret = 0;
}
return ret;
}
UCLASS_DRIVER(regulator) = {
.id = UCLASS_REGULATOR,
.name = "regulator",
.post_bind = regulator_post_bind,
.pre_probe = regulator_pre_probe,
.per_device_plat_auto = sizeof(struct dm_regulator_uclass_plat),
};
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