a0ebf66267
The Exynos Power Management Unit (PMU) drivers contain quite large static arrays of register values necessary for given Exynos SoC to enter low power mode. All this data is useless for ARMv8 SoC like Exynos5433, because the image will not be shared between ARMv7 and ARMv8. Add additional Kconfig symbol for selecting the SoC-specific driver addons thus skipping the useless data in the final image (this is similar approach to chosen for Exynos clock controller drivers): - exynos-pmu driver will be compiled on both architectures ARMv7 and ARMv8, - additional driver_data for ARMv7 SoCs will not be built on ARMv8 and a macro will return NULL for them in of_device_id - this should be safe as these compatibles cannot match on ARMv7 and driver anyway handles NULL driver_data, - on ARMv8 compile only exynos-pmu driver which exposes the syscon-regmap for PMU address space. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
160 lines
4 KiB
C
160 lines
4 KiB
C
/*
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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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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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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/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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if (pmu_data->pmu_config_extra) {
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for (i = 0; pmu_data->pmu_config_extra[i].offset != PMU_TABLE_END; i++)
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pmu_raw_writel(pmu_data->pmu_config_extra[i].val[mode],
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pmu_data->pmu_config_extra[i].offset);
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}
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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,exynos4212-pmu",
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.data = exynos_pmu_data_arm_ptr(exynos4212_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,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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{ /*sentinel*/ },
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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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struct resource *res;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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pmu_base_addr = devm_ioremap_resource(dev, res);
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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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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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