u-boot/drivers/power/domain/imx8-power-domain-legacy.c
Marek Vasut 20874a6072 power-domain: Return 0 if ops unimplemented and remove empty functions
In case the ops is not implemented, return 0 in the core right away.
This is better than having multiple copies of functions which just
return 0 in each power domain driver. Drop all those empty functions.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Cc: Simon Glass <sjg@chromium.org>
2022-04-21 12:44:23 +02:00

369 lines
8.7 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2017 NXP
*/
#include <common.h>
#include <dm.h>
#include <log.h>
#include <malloc.h>
#include <power-domain-uclass.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <asm/arch/power-domain.h>
#include <dm/device-internal.h>
#include <dm/device.h>
#include <dm/uclass-internal.h>
#include <asm/arch/sci/sci.h>
DECLARE_GLOBAL_DATA_PTR;
struct imx8_power_domain_priv {
bool state_on;
};
static bool check_device_power_off(struct udevice *dev,
const char *permanent_on_devices[],
int size)
{
int i;
for (i = 0; i < size; i++) {
if (!strcmp(dev->name, permanent_on_devices[i]))
return false;
}
return true;
}
void imx8_power_off_pd_devices(const char *permanent_on_devices[], int size)
{
struct udevice *dev;
struct power_domain pd;
for (uclass_find_first_device(UCLASS_POWER_DOMAIN, &dev); dev;
uclass_find_next_device(&dev)) {
if (!device_active(dev))
continue;
/*
* Power off active pd devices except the permanent
* power on devices
*/
if (check_device_power_off(dev, permanent_on_devices, size)) {
pd.dev = dev;
power_domain_off(&pd);
}
}
}
int imx8_power_domain_lookup_name(const char *name,
struct power_domain *power_domain)
{
struct udevice *dev;
struct power_domain_ops *ops;
int ret;
debug("%s(power_domain=%p name=%s)\n", __func__, power_domain, name);
ret = uclass_get_device_by_name(UCLASS_POWER_DOMAIN, name, &dev);
if (ret) {
printf("%s fail: %s, ret = %d\n", __func__, name, ret);
return ret;
}
ops = (struct power_domain_ops *)dev->driver->ops;
power_domain->dev = dev;
ret = ops->request(power_domain);
if (ret) {
debug("ops->request() failed: %d\n", ret);
return ret;
}
debug("%s ok: %s\n", __func__, dev->name);
return 0;
}
static int imx8_power_domain_on(struct power_domain *power_domain)
{
struct udevice *dev = power_domain->dev;
struct imx8_power_domain_plat *pdata;
struct imx8_power_domain_priv *ppriv;
sc_err_t ret;
int err;
struct power_domain parent_domain;
struct udevice *parent = dev_get_parent(dev);
/* Need to power on parent node first */
if (device_get_uclass_id(parent) == UCLASS_POWER_DOMAIN) {
parent_domain.dev = parent;
err = imx8_power_domain_on(&parent_domain);
if (err)
return err;
}
pdata = (struct imx8_power_domain_plat *)dev_get_plat(dev);
ppriv = (struct imx8_power_domain_priv *)dev_get_priv(dev);
debug("%s(power_domain=%s) resource_id %d\n", __func__, dev->name,
pdata->resource_id);
/* Already powered on */
if (ppriv->state_on)
return 0;
if (pdata->resource_id != SC_R_NONE) {
if (!sc_rm_is_resource_owned(-1, pdata->resource_id))
printf("%s [%d] not owned by curr partition\n", dev->name, pdata->resource_id);
ret = sc_pm_set_resource_power_mode(-1, pdata->resource_id,
SC_PM_PW_MODE_ON);
if (ret) {
printf("Error: %s Power up failed! (error = %d)\n",
dev->name, ret);
return -EIO;
}
}
ppriv->state_on = true;
debug("%s is powered on\n", dev->name);
return 0;
}
static int imx8_power_domain_off_node(struct power_domain *power_domain)
{
struct udevice *dev = power_domain->dev;
struct udevice *child;
struct imx8_power_domain_priv *ppriv;
struct imx8_power_domain_priv *child_ppriv;
struct imx8_power_domain_plat *pdata;
sc_err_t ret;
ppriv = dev_get_priv(dev);
pdata = dev_get_plat(dev);
debug("%s, %s, state_on %d\n", __func__, dev->name, ppriv->state_on);
/* Already powered off */
if (!ppriv->state_on)
return 0;
/* Check if all subnodes are off */
for (device_find_first_child(dev, &child);
child;
device_find_next_child(&child)) {
if (device_active(child)) {
child_ppriv =
(struct imx8_power_domain_priv *)dev_get_priv(child);
if (child_ppriv->state_on)
return -EPERM;
}
}
if (pdata->resource_id != SC_R_NONE) {
ret = sc_pm_set_resource_power_mode(-1, pdata->resource_id,
SC_PM_PW_MODE_OFF);
if (ret) {
if (!sc_rm_is_resource_owned(-1, pdata->resource_id)) {
printf("%s not owned by curr partition %d\n", dev->name, pdata->resource_id);
return 0;
}
printf("Error: %s Power off failed! (error = %d)\n",
dev->name, ret);
return -EIO;
}
}
ppriv->state_on = false;
debug("%s is powered off\n", dev->name);
return 0;
}
static int imx8_power_domain_off_parentnodes(struct power_domain *power_domain)
{
struct udevice *dev = power_domain->dev;
struct udevice *parent = dev_get_parent(dev);
struct udevice *child;
struct imx8_power_domain_priv *ppriv;
struct imx8_power_domain_priv *child_ppriv;
struct imx8_power_domain_plat *pdata;
sc_err_t ret;
struct power_domain parent_pd;
if (device_get_uclass_id(parent) == UCLASS_POWER_DOMAIN) {
pdata =
(struct imx8_power_domain_plat *)dev_get_plat(parent);
ppriv = (struct imx8_power_domain_priv *)dev_get_priv(parent);
debug("%s, %s, state_on %d\n", __func__, parent->name,
ppriv->state_on);
/* Already powered off */
if (!ppriv->state_on)
return 0;
/*
* Check if all sibling nodes are off. If yes,
* power off parent
*/
for (device_find_first_child(parent, &child); child;
device_find_next_child(&child)) {
if (device_active(child)) {
child_ppriv = (struct imx8_power_domain_priv *)
dev_get_priv(child);
/* Find a power on sibling */
if (child_ppriv->state_on) {
debug("sibling %s, state_on %d\n",
child->name,
child_ppriv->state_on);
return 0;
}
}
}
/* power off parent */
if (pdata->resource_id != SC_R_NONE) {
ret = sc_pm_set_resource_power_mode(-1,
pdata->resource_id,
SC_PM_PW_MODE_OFF);
if (ret) {
printf("%s Power off failed! (error = %d)\n",
parent->name, ret);
return -EIO;
}
}
ppriv->state_on = false;
debug("%s is powered off\n", parent->name);
parent_pd.dev = parent;
imx8_power_domain_off_parentnodes(&parent_pd);
}
return 0;
}
static int imx8_power_domain_off(struct power_domain *power_domain)
{
int ret;
debug("%s(power_domain=%p)\n", __func__, power_domain);
/* Turn off the node */
ret = imx8_power_domain_off_node(power_domain);
if (ret) {
debug("Can't power off the node of dev %s, ret = %d\n",
power_domain->dev->name, ret);
return ret;
}
/* Turn off parent nodes, if sibling nodes are all off */
ret = imx8_power_domain_off_parentnodes(power_domain);
if (ret) {
printf("Failed to power off parent nodes of dev %s, ret = %d\n",
power_domain->dev->name, ret);
return ret;
}
return 0;
}
static int imx8_power_domain_of_xlate(struct power_domain *power_domain,
struct ofnode_phandle_args *args)
{
debug("%s(power_domain=%p)\n", __func__, power_domain);
/* Do nothing to the xlate, since we don't have args used */
return 0;
}
static int imx8_power_domain_bind(struct udevice *dev)
{
int offset;
const char *name;
int ret = 0;
debug("%s(dev=%p)\n", __func__, dev);
offset = dev_of_offset(dev);
for (offset = fdt_first_subnode(gd->fdt_blob, offset); offset > 0;
offset = fdt_next_subnode(gd->fdt_blob, offset)) {
/* Bind the subnode to this driver */
name = fdt_get_name(gd->fdt_blob, offset, NULL);
ret = device_bind_with_driver_data(dev, dev->driver, name,
dev->driver_data,
offset_to_ofnode(offset),
NULL);
if (ret == -ENODEV)
printf("Driver '%s' refuses to bind\n",
dev->driver->name);
if (ret)
printf("Error binding driver '%s': %d\n",
dev->driver->name, ret);
}
return 0;
}
static int imx8_power_domain_probe(struct udevice *dev)
{
struct imx8_power_domain_priv *ppriv;
debug("%s(dev=%s)\n", __func__, dev->name);
ppriv = (struct imx8_power_domain_priv *)dev_get_priv(dev);
/* Set default to power off */
if (ppriv)
ppriv->state_on = false;
return 0;
}
static int imx8_power_domain_of_to_plat(struct udevice *dev)
{
int reg;
struct imx8_power_domain_plat *pdata = dev_get_plat(dev);
reg = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "reg", -1);
if (reg == -1) {
debug("%s: Invalid resource id %d\n", __func__, reg);
return -EINVAL;
}
pdata->resource_id = (sc_rsrc_t)reg;
debug("%s resource_id %d\n", __func__, pdata->resource_id);
return 0;
}
static const struct udevice_id imx8_power_domain_ids[] = {
{ .compatible = "nxp,imx8-pd" },
{ }
};
struct power_domain_ops imx8_power_domain_ops = {
.on = imx8_power_domain_on,
.off = imx8_power_domain_off,
.of_xlate = imx8_power_domain_of_xlate,
};
U_BOOT_DRIVER(imx8_power_domain) = {
.name = "imx8_power_domain",
.id = UCLASS_POWER_DOMAIN,
.of_match = imx8_power_domain_ids,
.bind = imx8_power_domain_bind,
.probe = imx8_power_domain_probe,
.of_to_plat = imx8_power_domain_of_to_plat,
.plat_auto = sizeof(struct imx8_power_domain_plat),
.priv_auto = sizeof(struct imx8_power_domain_priv),
.ops = &imx8_power_domain_ops,
.flags = DM_FLAG_DEFAULT_PD_CTRL_OFF,
};