// SPDX-License-Identifier: GPL-2.0 /* * Copyright 2017 NXP */ #include #include #include #include #include #include #include #include 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, .rfree = 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, };