1 // SPDX-License-Identifier: GPL-2.0
3 // Exynos Generic power domain support.
8 // Implementation of Exynos specific power domain control which is used in
9 // conjunction with runtime-pm. Support for both device-tree and non-device-tree
10 // based power domain support is included.
23 	/* Value for LOCAL_PWR_CFG and STATUS fields for each domain */
28  * Exynos specific wrapper around the generic power domain
36 static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)  in exynos_pd_power()  argument
43 	pd = container_of(domain, struct exynos_pm_domain, pd);  in exynos_pd_power()
44 	base = pd->base;  in exynos_pd_power()
46 	pwr = power_on ? pd->local_pwr_cfg : 0;  in exynos_pd_power()
52 	while ((readl_relaxed(base + 0x4) & pd->local_pwr_cfg) != pwr) {  in exynos_pd_power()
55 			pr_err("Power domain %s %s failed\n", domain->name, op);  in exynos_pd_power()
56 			return -ETIMEDOUT;  in exynos_pd_power()
58 		timeout--;  in exynos_pd_power()
66 static int exynos_pd_power_on(struct generic_pm_domain *domain)  in exynos_pd_power_on()  argument
68 	return exynos_pd_power(domain, true);  in exynos_pd_power_on()
71 static int exynos_pd_power_off(struct generic_pm_domain *domain)  in exynos_pd_power_off()  argument
73 	return exynos_pd_power(domain, false);  in exynos_pd_power_off()
86 		.compatible = "samsung,exynos4210-pd",
89 		.compatible = "samsung,exynos5433-pd",
95 static const char *exynos_get_domain_name(struct device_node *node)  in exynos_get_domain_name()  argument
99 	if (of_property_read_string(node, "label", &name) < 0)  in exynos_get_domain_name()
100 		name = kbasename(node->full_name);  in exynos_get_domain_name()
107 	struct device *dev = &pdev->dev;  in exynos_pd_probe()
108 	struct device_node *np = dev->of_node;  in exynos_pd_probe()
116 		return -ENOMEM;  in exynos_pd_probe()
118 	pd->pd.name = exynos_get_domain_name(np);  in exynos_pd_probe()
119 	if (!pd->pd.name)  in exynos_pd_probe()
120 		return -ENOMEM;  in exynos_pd_probe()
122 	pd->base = of_iomap(np, 0);  in exynos_pd_probe()
123 	if (!pd->base) {  in exynos_pd_probe()
124 		kfree_const(pd->pd.name);  in exynos_pd_probe()
125 		return -ENODEV;  in exynos_pd_probe()
128 	pd->pd.power_off = exynos_pd_power_off;  in exynos_pd_probe()
129 	pd->pd.power_on = exynos_pd_power_on;  in exynos_pd_probe()
130 	pd->local_pwr_cfg = pm_domain_cfg->local_pwr_cfg;  in exynos_pd_probe()
132 	on = readl_relaxed(pd->base + 0x4) & pd->local_pwr_cfg;  in exynos_pd_probe()
134 	pm_genpd_init(&pd->pd, NULL, !on);  in exynos_pd_probe()
135 	ret = of_genpd_add_provider_simple(np, &pd->pd);  in exynos_pd_probe()
137 	if (ret == 0 && of_parse_phandle_with_args(np, "power-domains",  in exynos_pd_probe()
138 				      "#power-domain-cells", 0, &parent) == 0) {  in exynos_pd_probe()
157 		.name		= "exynos-pd",