163 lines
3.9 KiB
C
163 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (c) 2011-2014 Samsung Electronics Co., Ltd.
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// http://www.samsung.com/
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//
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// Exynos - CPU PMU(Power Management Unit) support
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/syscon.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/soc/samsung/exynos-regs-pmu.h>
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#include <linux/soc/samsung/exynos-pmu.h>
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#include "exynos-pmu.h"
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struct exynos_pmu_context {
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struct device *dev;
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const struct exynos_pmu_data *pmu_data;
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};
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void __iomem *pmu_base_addr;
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static struct exynos_pmu_context *pmu_context;
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void pmu_raw_writel(u32 val, u32 offset)
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{
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writel_relaxed(val, pmu_base_addr + offset);
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}
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u32 pmu_raw_readl(u32 offset)
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{
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return readl_relaxed(pmu_base_addr + offset);
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}
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void exynos_sys_powerdown_conf(enum sys_powerdown mode)
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{
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unsigned int i;
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const struct exynos_pmu_data *pmu_data;
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if (!pmu_context || !pmu_context->pmu_data)
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return;
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pmu_data = pmu_context->pmu_data;
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if (pmu_data->powerdown_conf)
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pmu_data->powerdown_conf(mode);
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if (pmu_data->pmu_config) {
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for (i = 0; (pmu_data->pmu_config[i].offset != PMU_TABLE_END); i++)
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pmu_raw_writel(pmu_data->pmu_config[i].val[mode],
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pmu_data->pmu_config[i].offset);
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}
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if (pmu_data->powerdown_conf_extra)
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pmu_data->powerdown_conf_extra(mode);
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}
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/*
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* Split the data between ARM architectures because it is relatively big
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* and useless on other arch.
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*/
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#ifdef CONFIG_EXYNOS_PMU_ARM_DRIVERS
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#define exynos_pmu_data_arm_ptr(data) (&data)
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#else
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#define exynos_pmu_data_arm_ptr(data) NULL
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#endif
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/*
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* PMU platform driver and devicetree bindings.
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*/
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static const struct of_device_id exynos_pmu_of_device_ids[] = {
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{
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.compatible = "samsung,exynos3250-pmu",
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.data = exynos_pmu_data_arm_ptr(exynos3250_pmu_data),
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}, {
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.compatible = "samsung,exynos4210-pmu",
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.data = exynos_pmu_data_arm_ptr(exynos4210_pmu_data),
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}, {
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.compatible = "samsung,exynos4412-pmu",
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.data = exynos_pmu_data_arm_ptr(exynos4412_pmu_data),
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}, {
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.compatible = "samsung,exynos5250-pmu",
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.data = exynos_pmu_data_arm_ptr(exynos5250_pmu_data),
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}, {
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.compatible = "samsung,exynos5410-pmu",
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}, {
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.compatible = "samsung,exynos5420-pmu",
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.data = exynos_pmu_data_arm_ptr(exynos5420_pmu_data),
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}, {
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.compatible = "samsung,exynos5433-pmu",
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}, {
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.compatible = "samsung,exynos7-pmu",
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},
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{ /*sentinel*/ },
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};
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static const struct mfd_cell exynos_pmu_devs[] = {
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{ .name = "exynos-clkout", },
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};
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struct regmap *exynos_get_pmu_regmap(void)
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{
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struct device_node *np = of_find_matching_node(NULL,
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exynos_pmu_of_device_ids);
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if (np)
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return syscon_node_to_regmap(np);
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return ERR_PTR(-ENODEV);
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}
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EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap);
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static int exynos_pmu_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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int ret;
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pmu_base_addr = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(pmu_base_addr))
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return PTR_ERR(pmu_base_addr);
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pmu_context = devm_kzalloc(&pdev->dev,
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sizeof(struct exynos_pmu_context),
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GFP_KERNEL);
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if (!pmu_context)
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return -ENOMEM;
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pmu_context->dev = dev;
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pmu_context->pmu_data = of_device_get_match_data(dev);
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if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init)
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pmu_context->pmu_data->pmu_init();
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platform_set_drvdata(pdev, pmu_context);
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ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, exynos_pmu_devs,
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ARRAY_SIZE(exynos_pmu_devs), NULL, 0, NULL);
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if (ret)
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return ret;
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if (devm_of_platform_populate(dev))
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dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n");
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dev_dbg(dev, "Exynos PMU Driver probe done\n");
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return 0;
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}
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static struct platform_driver exynos_pmu_driver = {
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.driver = {
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.name = "exynos-pmu",
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.of_match_table = exynos_pmu_of_device_ids,
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},
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.probe = exynos_pmu_probe,
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};
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static int __init exynos_pmu_init(void)
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{
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return platform_driver_register(&exynos_pmu_driver);
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}
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postcore_initcall(exynos_pmu_init);
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