// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2016, NVIDIA CORPORATION. */ #define LOG_CATEGORY UCLASS_POWER_DOMAIN #include #include #include #include #include #include struct power_domain_priv { int *on_count; }; static inline struct power_domain_ops *power_domain_dev_ops(struct udevice *dev) { return (struct power_domain_ops *)dev->driver->ops; } static int power_domain_of_xlate_default(struct power_domain *power_domain, struct ofnode_phandle_args *args) { debug("%s(power_domain=%p)\n", __func__, power_domain); if (args->args_count != 1) { debug("Invalid args_count: %d\n", args->args_count); return -EINVAL; } power_domain->id = args->args[0]; return 0; } int power_domain_get_by_index(struct udevice *dev, struct power_domain *power_domain, int index) { struct ofnode_phandle_args args; int ret; struct udevice *dev_power_domain; struct power_domain_ops *ops; debug("%s(dev=%p, power_domain=%p)\n", __func__, dev, power_domain); ret = dev_read_phandle_with_args(dev, "power-domains", "#power-domain-cells", 0, index, &args); if (ret) { debug("%s: dev_read_phandle_with_args failed: %d\n", __func__, ret); return ret; } ret = uclass_get_device_by_ofnode(UCLASS_POWER_DOMAIN, args.node, &dev_power_domain); if (ret) { debug("%s: uclass_get_device_by_ofnode failed: %d\n", __func__, ret); return ret; } ops = power_domain_dev_ops(dev_power_domain); power_domain->dev = dev_power_domain; if (ops->of_xlate) ret = ops->of_xlate(power_domain, &args); else ret = power_domain_of_xlate_default(power_domain, &args); if (ret) { debug("of_xlate() failed: %d\n", ret); return ret; } ret = ops->request ? ops->request(power_domain) : 0; if (ret) { debug("ops->request() failed: %d\n", ret); return ret; } return 0; } int power_domain_get_by_name(struct udevice *dev, struct power_domain *power_domain, const char *name) { int index; index = dev_read_stringlist_search(dev, "power-domain-names", name); if (index < 0) { debug("fdt_stringlist_search() failed: %d\n", index); return index; } return power_domain_get_by_index(dev, power_domain, index); } int power_domain_get(struct udevice *dev, struct power_domain *power_domain) { return power_domain_get_by_index(dev, power_domain, 0); } int power_domain_free(struct power_domain *power_domain) { struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev); debug("%s(power_domain=%p)\n", __func__, power_domain); return ops->rfree ? ops->rfree(power_domain) : 0; } int power_domain_on_lowlevel(struct power_domain *power_domain) { struct power_domain_priv *priv = dev_get_uclass_priv(power_domain->dev); struct power_domain_plat *plat = dev_get_uclass_plat(power_domain->dev); struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev); int *on_count = plat->subdomains ? &priv->on_count[power_domain->id] : NULL; int ret; /* Refcounting is not enabled on all drivers by default */ if (on_count) { debug("Enable power domain %s.%ld: %d -> %d (%s)\n", power_domain->dev->name, power_domain->id, *on_count, *on_count + 1, (((*on_count + 1) > 1) ? "EALREADY" : "todo")); (*on_count)++; if (*on_count > 1) return -EALREADY; } ret = ops->on ? ops->on(power_domain) : 0; if (ret) { if (on_count) (*on_count)--; return ret; } return 0; } int power_domain_off_lowlevel(struct power_domain *power_domain) { struct power_domain_priv *priv = dev_get_uclass_priv(power_domain->dev); struct power_domain_plat *plat = dev_get_uclass_plat(power_domain->dev); struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev); int *on_count = plat->subdomains ? &priv->on_count[power_domain->id] : NULL; int ret; /* Refcounting is not enabled on all drivers by default */ if (on_count) { debug("Disable power domain %s.%ld: %d -> %d (%s%s)\n", power_domain->dev->name, power_domain->id, *on_count, *on_count - 1, (((*on_count) <= 0) ? "EALREADY" : ""), (((*on_count - 1) > 0) ? "BUSY" : "todo")); if (*on_count <= 0) return -EALREADY; (*on_count)--; if (*on_count > 0) return -EBUSY; } ret = ops->off ? ops->off(power_domain) : 0; if (ret) { if (on_count) (*on_count)++; return ret; } return 0; } #if CONFIG_IS_ENABLED(OF_REAL) static int dev_power_domain_ctrl(struct udevice *dev, bool on) { struct power_domain pd; int i, count, ret = 0; count = dev_count_phandle_with_args(dev, "power-domains", "#power-domain-cells", 0); for (i = 0; i < count; i++) { ret = power_domain_get_by_index(dev, &pd, i); if (ret) return ret; if (on) ret = power_domain_on(&pd); else ret = power_domain_off(&pd); } /* * For platforms with parent and child power-domain devices * we may not run device_remove() on the power-domain parent * because it will result in removing its children and switching * off their power-domain parent. So we will get here again and * again and will be stuck in an endless loop. */ if (count > 0 && !on && dev_get_parent(dev) == pd.dev && device_get_uclass_id(dev) == UCLASS_POWER_DOMAIN) return ret; /* * power_domain_get() bound the device, thus * we must remove it again to prevent unbinding * active devices (which would result in unbind * error). */ if (count > 0 && !on) device_remove(pd.dev, DM_REMOVE_NORMAL); return ret; } int dev_power_domain_on(struct udevice *dev) { return dev_power_domain_ctrl(dev, true); } int dev_power_domain_off(struct udevice *dev) { return dev_power_domain_ctrl(dev, false); } #endif /* OF_REAL */ static int power_domain_post_probe(struct udevice *dev) { struct power_domain_priv *priv = dev_get_uclass_priv(dev); struct power_domain_plat *plat = dev_get_uclass_plat(dev); if (plat->subdomains) { priv->on_count = calloc(sizeof(int), plat->subdomains); if (!priv->on_count) return -ENOMEM; } return 0; } static int power_domain_pre_remove(struct udevice *dev) { struct power_domain_priv *priv = dev_get_uclass_priv(dev); struct power_domain_plat *plat = dev_get_uclass_plat(dev); if (plat->subdomains) free(priv->on_count); return 0; } UCLASS_DRIVER(power_domain) = { .id = UCLASS_POWER_DOMAIN, .name = "power_domain", .post_probe = power_domain_post_probe, .pre_remove = power_domain_pre_remove, .per_device_auto = sizeof(struct power_domain_priv), .per_device_plat_auto = sizeof(struct power_domain_plat), };