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![Marek Szyprowski](/assets/img/avatar_default.png)
Handling of special clock operations on power domain on/off sequences has been moved to respective Exynos clock controller drivers, so there is no need to keep the duplicated (and conflicting) code in Exynos power domain driver. Mark clock related properties in Exynos power domain bindings as deprecated. This change has no inpact on backwards-compatibility, as the new drivers properly work with old DTBs (deprecated properties are ignored). Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
168 lines
3.9 KiB
C
168 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/sched.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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bool is_off;
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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 __initconst = {
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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 __initconst = {
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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[] __initconst = {
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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 __init 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 __init int exynos4_pm_init_power_domain(void)
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{
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struct device_node *np;
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const struct of_device_id *match;
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for_each_matching_node_and_match(np, exynos_pm_domain_of_match, &match) {
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const struct exynos_pm_domain_config *pm_domain_cfg;
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struct exynos_pm_domain *pd;
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int on;
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pm_domain_cfg = match->data;
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pd = kzalloc(sizeof(*pd), GFP_KERNEL);
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if (!pd) {
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of_node_put(np);
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return -ENOMEM;
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}
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pd->pd.name = exynos_get_domain_name(np);
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if (!pd->pd.name) {
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kfree(pd);
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of_node_put(np);
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return -ENOMEM;
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}
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pd->base = of_iomap(np, 0);
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if (!pd->base) {
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pr_warn("%s: failed to map memory\n", __func__);
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kfree_const(pd->pd.name);
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kfree(pd);
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continue;
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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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of_genpd_add_provider_simple(np, &pd->pd);
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}
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/* Assign the child power domains to their parents */
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for_each_matching_node(np, exynos_pm_domain_of_match) {
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struct of_phandle_args child, parent;
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child.np = np;
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child.args_count = 0;
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if (of_parse_phandle_with_args(np, "power-domains",
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"#power-domain-cells", 0,
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&parent) != 0)
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continue;
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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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return 0;
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}
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core_initcall(exynos4_pm_init_power_domain);
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