--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2017 NXP
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <power-domain-uclass.h>
+#include <asm/io.h>
+#include <asm/arch/power-domain.h>
+#include <dm/device-internal.h>
+#include <dm/device.h>
+#include <asm/arch/sci/sci.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct imx8_power_domain_priv {
+ bool state_on;
+};
+
+static int imx8_power_domain_request(struct power_domain *power_domain)
+{
+ debug("%s(power_domain=%p)\n", __func__, power_domain);
+
+ return 0;
+}
+
+static int imx8_power_domain_free(struct power_domain *power_domain)
+{
+ debug("%s(power_domain=%p)\n", __func__, power_domain);
+
+ return 0;
+}
+
+static int imx8_power_domain_on(struct power_domain *power_domain)
+{
+ struct udevice *dev = power_domain->dev;
+ struct imx8_power_domain_platdata *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_platdata *)dev_get_platdata(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_LAST) {
+ 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_platdata *pdata;
+ sc_err_t ret;
+
+ ppriv = dev_get_priv(dev);
+ pdata = dev_get_platdata(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_LAST) {
+ if (!sc_rm_is_resource_owned(-1, pdata->resource_id)) {
+ printf("%s not owned by curr partition\n", dev->name);
+ return 0;
+ }
+ ret = sc_pm_set_resource_power_mode(-1, pdata->resource_id,
+ SC_PM_PW_MODE_OFF);
+ if (ret) {
+ 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_platdata *pdata;
+ sc_err_t ret;
+ struct power_domain parent_pd;
+
+ if (device_get_uclass_id(parent) == UCLASS_POWER_DOMAIN) {
+ pdata =
+ (struct imx8_power_domain_platdata *)dev_get_platdata(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_LAST) {
+ 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_ofdata_to_platdata(struct udevice *dev)
+{
+ int reg;
+ struct imx8_power_domain_platdata *pdata = dev_get_platdata(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 = {
+ .request = imx8_power_domain_request,
+ .free = imx8_power_domain_free,
+ .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,
+ .ofdata_to_platdata = imx8_power_domain_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct imx8_power_domain_platdata),
+ .priv_auto_alloc_size = sizeof(struct imx8_power_domain_priv),
+ .ops = &imx8_power_domain_ops,
+};
projects / u-boot.git / commitdiff