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![Krzysztof Kozlowski](/assets/img/avatar_default.png)
The 'is_off' member of internal state structure 'exynos_pm_domain' is
not used anymore.
Fixes: 2ed5f23671
("ARM: EXYNOS: Detect power domain state on registration from DT")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20211008075253.67961-1-krzysztof.kozlowski@canonical.com
166 lines
3.9 KiB
C
166 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Exynos Generic power domain support.
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//
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// Copyright (c) 2012 Samsung Electronics Co., Ltd.
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// http://www.samsung.com
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//
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// Implementation of Exynos specific power domain control which is used in
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// conjunction with runtime-pm. Support for both device-tree and non-device-tree
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// based power domain support is included.
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/pm_domain.h>
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#include <linux/delay.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/pm_runtime.h>
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struct exynos_pm_domain_config {
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/* Value for LOCAL_PWR_CFG and STATUS fields for each domain */
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u32 local_pwr_cfg;
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};
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/*
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* Exynos specific wrapper around the generic power domain
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*/
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struct exynos_pm_domain {
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void __iomem *base;
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struct generic_pm_domain pd;
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u32 local_pwr_cfg;
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};
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static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
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{
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struct exynos_pm_domain *pd;
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void __iomem *base;
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u32 timeout, pwr;
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char *op;
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pd = container_of(domain, struct exynos_pm_domain, pd);
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base = pd->base;
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pwr = power_on ? pd->local_pwr_cfg : 0;
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writel_relaxed(pwr, base);
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/* Wait max 1ms */
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timeout = 10;
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while ((readl_relaxed(base + 0x4) & pd->local_pwr_cfg) != pwr) {
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if (!timeout) {
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op = (power_on) ? "enable" : "disable";
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pr_err("Power domain %s %s failed\n", domain->name, op);
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return -ETIMEDOUT;
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}
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timeout--;
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cpu_relax();
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usleep_range(80, 100);
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}
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return 0;
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}
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static int exynos_pd_power_on(struct generic_pm_domain *domain)
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{
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return exynos_pd_power(domain, true);
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}
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static int exynos_pd_power_off(struct generic_pm_domain *domain)
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{
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return exynos_pd_power(domain, false);
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}
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static const struct exynos_pm_domain_config exynos4210_cfg = {
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.local_pwr_cfg = 0x7,
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};
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static const struct exynos_pm_domain_config exynos5433_cfg = {
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.local_pwr_cfg = 0xf,
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};
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static const struct of_device_id exynos_pm_domain_of_match[] = {
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{
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.compatible = "samsung,exynos4210-pd",
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.data = &exynos4210_cfg,
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}, {
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.compatible = "samsung,exynos5433-pd",
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.data = &exynos5433_cfg,
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},
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{ },
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};
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static const char *exynos_get_domain_name(struct device_node *node)
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{
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const char *name;
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if (of_property_read_string(node, "label", &name) < 0)
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name = kbasename(node->full_name);
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return kstrdup_const(name, GFP_KERNEL);
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}
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static int exynos_pd_probe(struct platform_device *pdev)
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{
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const struct exynos_pm_domain_config *pm_domain_cfg;
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct of_phandle_args child, parent;
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struct exynos_pm_domain *pd;
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int on, ret;
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pm_domain_cfg = of_device_get_match_data(dev);
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pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
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if (!pd)
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return -ENOMEM;
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pd->pd.name = exynos_get_domain_name(np);
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if (!pd->pd.name)
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return -ENOMEM;
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pd->base = of_iomap(np, 0);
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if (!pd->base) {
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kfree_const(pd->pd.name);
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return -ENODEV;
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}
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pd->pd.power_off = exynos_pd_power_off;
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pd->pd.power_on = exynos_pd_power_on;
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pd->local_pwr_cfg = pm_domain_cfg->local_pwr_cfg;
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on = readl_relaxed(pd->base + 0x4) & pd->local_pwr_cfg;
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pm_genpd_init(&pd->pd, NULL, !on);
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ret = of_genpd_add_provider_simple(np, &pd->pd);
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if (ret == 0 && of_parse_phandle_with_args(np, "power-domains",
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"#power-domain-cells", 0, &parent) == 0) {
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child.np = np;
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child.args_count = 0;
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if (of_genpd_add_subdomain(&parent, &child))
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pr_warn("%pOF failed to add subdomain: %pOF\n",
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parent.np, child.np);
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else
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pr_info("%pOF has as child subdomain: %pOF.\n",
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parent.np, child.np);
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}
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pm_runtime_enable(dev);
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return ret;
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}
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static struct platform_driver exynos_pd_driver = {
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.probe = exynos_pd_probe,
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.driver = {
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.name = "exynos-pd",
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.of_match_table = exynos_pm_domain_of_match,
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.suppress_bind_attrs = true,
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}
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};
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static __init int exynos4_pm_init_power_domain(void)
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{
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return platform_driver_register(&exynos_pd_driver);
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}
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core_initcall(exynos4_pm_init_power_domain);
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