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93618e344a
The Exynos clock output (clkout) driver uses same register address space (Power Management Unit address space) as Exynos PMU driver and same set of compatibles. It was modeled as clock provider instantiated with CLK_OF_DECLARE_DRIVER(). This however brings ordering problems and lack of probe deferral, therefore clkout driver should be converted to a regular module and instantiated as a child of PMU driver to be able to use existing compatibles and address space. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Tested-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Stephen Boyd <sboyd@kernel.org> Link: https://lore.kernel.org/r/20201001165646.32279-2-krzk@kernel.org
162 lines
3.9 KiB
C
162 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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