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https://github.com/AsahiLinux/u-boot
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316 lines
7.6 KiB
C
316 lines
7.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2017 NXP
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*/
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#include <common.h>
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#include <dm.h>
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#include <power-domain-uclass.h>
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#include <asm/io.h>
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#include <asm/arch/power-domain.h>
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#include <dm/device-internal.h>
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#include <dm/device.h>
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#include <asm/arch/sci/sci.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct imx8_power_domain_priv {
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bool state_on;
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};
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static int imx8_power_domain_request(struct power_domain *power_domain)
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{
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debug("%s(power_domain=%p)\n", __func__, power_domain);
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return 0;
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}
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static int imx8_power_domain_free(struct power_domain *power_domain)
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{
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debug("%s(power_domain=%p)\n", __func__, power_domain);
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return 0;
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}
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static int imx8_power_domain_on(struct power_domain *power_domain)
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{
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struct udevice *dev = power_domain->dev;
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struct imx8_power_domain_platdata *pdata;
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struct imx8_power_domain_priv *ppriv;
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sc_err_t ret;
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int err;
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struct power_domain parent_domain;
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struct udevice *parent = dev_get_parent(dev);
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/* Need to power on parent node first */
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if (device_get_uclass_id(parent) == UCLASS_POWER_DOMAIN) {
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parent_domain.dev = parent;
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err = imx8_power_domain_on(&parent_domain);
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if (err)
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return err;
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}
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pdata = (struct imx8_power_domain_platdata *)dev_get_platdata(dev);
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ppriv = (struct imx8_power_domain_priv *)dev_get_priv(dev);
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debug("%s(power_domain=%s) resource_id %d\n", __func__, dev->name,
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pdata->resource_id);
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/* Already powered on */
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if (ppriv->state_on)
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return 0;
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if (pdata->resource_id != SC_R_LAST) {
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ret = sc_pm_set_resource_power_mode(-1, pdata->resource_id,
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SC_PM_PW_MODE_ON);
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if (ret) {
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printf("Error: %s Power up failed! (error = %d)\n",
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dev->name, ret);
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return -EIO;
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}
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}
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ppriv->state_on = true;
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debug("%s is powered on\n", dev->name);
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return 0;
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}
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static int imx8_power_domain_off_node(struct power_domain *power_domain)
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{
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struct udevice *dev = power_domain->dev;
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struct udevice *child;
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struct imx8_power_domain_priv *ppriv;
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struct imx8_power_domain_priv *child_ppriv;
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struct imx8_power_domain_platdata *pdata;
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sc_err_t ret;
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ppriv = dev_get_priv(dev);
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pdata = dev_get_platdata(dev);
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debug("%s, %s, state_on %d\n", __func__, dev->name, ppriv->state_on);
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/* Already powered off */
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if (!ppriv->state_on)
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return 0;
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/* Check if all subnodes are off */
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for (device_find_first_child(dev, &child);
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child;
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device_find_next_child(&child)) {
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if (device_active(child)) {
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child_ppriv =
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(struct imx8_power_domain_priv *)dev_get_priv(child);
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if (child_ppriv->state_on)
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return -EPERM;
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}
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}
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if (pdata->resource_id != SC_R_LAST) {
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if (!sc_rm_is_resource_owned(-1, pdata->resource_id)) {
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printf("%s not owned by curr partition\n", dev->name);
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return 0;
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}
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ret = sc_pm_set_resource_power_mode(-1, pdata->resource_id,
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SC_PM_PW_MODE_OFF);
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if (ret) {
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printf("Error: %s Power off failed! (error = %d)\n",
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dev->name, ret);
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return -EIO;
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}
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}
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ppriv->state_on = false;
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debug("%s is powered off\n", dev->name);
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return 0;
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}
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static int imx8_power_domain_off_parentnodes(struct power_domain *power_domain)
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{
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struct udevice *dev = power_domain->dev;
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struct udevice *parent = dev_get_parent(dev);
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struct udevice *child;
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struct imx8_power_domain_priv *ppriv;
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struct imx8_power_domain_priv *child_ppriv;
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struct imx8_power_domain_platdata *pdata;
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sc_err_t ret;
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struct power_domain parent_pd;
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if (device_get_uclass_id(parent) == UCLASS_POWER_DOMAIN) {
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pdata =
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(struct imx8_power_domain_platdata *)dev_get_platdata(parent);
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ppriv = (struct imx8_power_domain_priv *)dev_get_priv(parent);
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debug("%s, %s, state_on %d\n", __func__, parent->name,
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ppriv->state_on);
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/* Already powered off */
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if (!ppriv->state_on)
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return 0;
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/*
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* Check if all sibling nodes are off. If yes,
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* power off parent
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*/
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for (device_find_first_child(parent, &child); child;
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device_find_next_child(&child)) {
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if (device_active(child)) {
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child_ppriv = (struct imx8_power_domain_priv *)
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dev_get_priv(child);
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/* Find a power on sibling */
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if (child_ppriv->state_on) {
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debug("sibling %s, state_on %d\n",
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child->name,
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child_ppriv->state_on);
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return 0;
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}
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}
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}
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/* power off parent */
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if (pdata->resource_id != SC_R_LAST) {
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ret = sc_pm_set_resource_power_mode(-1,
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pdata->resource_id,
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SC_PM_PW_MODE_OFF);
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if (ret) {
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printf("%s Power off failed! (error = %d)\n",
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parent->name, ret);
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return -EIO;
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}
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}
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ppriv->state_on = false;
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debug("%s is powered off\n", parent->name);
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parent_pd.dev = parent;
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imx8_power_domain_off_parentnodes(&parent_pd);
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}
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return 0;
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}
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static int imx8_power_domain_off(struct power_domain *power_domain)
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{
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int ret;
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debug("%s(power_domain=%p)\n", __func__, power_domain);
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/* Turn off the node */
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ret = imx8_power_domain_off_node(power_domain);
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if (ret) {
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debug("Can't power off the node of dev %s, ret = %d\n",
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power_domain->dev->name, ret);
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return ret;
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}
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/* Turn off parent nodes, if sibling nodes are all off */
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ret = imx8_power_domain_off_parentnodes(power_domain);
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if (ret) {
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printf("Failed to power off parent nodes of dev %s, ret = %d\n",
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power_domain->dev->name, ret);
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return ret;
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}
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return 0;
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}
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static int imx8_power_domain_of_xlate(struct power_domain *power_domain,
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struct ofnode_phandle_args *args)
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{
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debug("%s(power_domain=%p)\n", __func__, power_domain);
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/* Do nothing to the xlate, since we don't have args used */
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return 0;
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}
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static int imx8_power_domain_bind(struct udevice *dev)
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{
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int offset;
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const char *name;
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int ret = 0;
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debug("%s(dev=%p)\n", __func__, dev);
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offset = dev_of_offset(dev);
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for (offset = fdt_first_subnode(gd->fdt_blob, offset); offset > 0;
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offset = fdt_next_subnode(gd->fdt_blob, offset)) {
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/* Bind the subnode to this driver */
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name = fdt_get_name(gd->fdt_blob, offset, NULL);
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ret = device_bind_with_driver_data(dev, dev->driver, name,
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dev->driver_data,
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offset_to_ofnode(offset),
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NULL);
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if (ret == -ENODEV)
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printf("Driver '%s' refuses to bind\n",
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dev->driver->name);
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if (ret)
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printf("Error binding driver '%s': %d\n",
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dev->driver->name, ret);
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}
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return 0;
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}
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static int imx8_power_domain_probe(struct udevice *dev)
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{
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struct imx8_power_domain_priv *ppriv;
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debug("%s(dev=%s)\n", __func__, dev->name);
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ppriv = (struct imx8_power_domain_priv *)dev_get_priv(dev);
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/* Set default to power off */
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if (ppriv)
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ppriv->state_on = false;
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return 0;
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}
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static int imx8_power_domain_ofdata_to_platdata(struct udevice *dev)
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{
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int reg;
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struct imx8_power_domain_platdata *pdata = dev_get_platdata(dev);
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reg = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "reg", -1);
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if (reg == -1) {
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debug("%s: Invalid resource id %d\n", __func__, reg);
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return -EINVAL;
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}
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pdata->resource_id = (sc_rsrc_t)reg;
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debug("%s resource_id %d\n", __func__, pdata->resource_id);
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return 0;
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}
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static const struct udevice_id imx8_power_domain_ids[] = {
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{ .compatible = "nxp,imx8-pd" },
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{ }
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};
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struct power_domain_ops imx8_power_domain_ops = {
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.request = imx8_power_domain_request,
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.free = imx8_power_domain_free,
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.on = imx8_power_domain_on,
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.off = imx8_power_domain_off,
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.of_xlate = imx8_power_domain_of_xlate,
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};
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U_BOOT_DRIVER(imx8_power_domain) = {
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.name = "imx8_power_domain",
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.id = UCLASS_POWER_DOMAIN,
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.of_match = imx8_power_domain_ids,
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.bind = imx8_power_domain_bind,
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.probe = imx8_power_domain_probe,
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.ofdata_to_platdata = imx8_power_domain_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct imx8_power_domain_platdata),
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.priv_auto_alloc_size = sizeof(struct imx8_power_domain_priv),
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.ops = &imx8_power_domain_ops,
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};
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