diff options
Diffstat (limited to 'drivers/soc/samsung/exynos-pmu.c')
| -rw-r--r-- | drivers/soc/samsung/exynos-pmu.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/drivers/soc/samsung/exynos-pmu.c b/drivers/soc/samsung/exynos-pmu.c new file mode 100644 index 000000000..732c86ce2 --- /dev/null +++ b/drivers/soc/samsung/exynos-pmu.c @@ -0,0 +1,164 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (c) 2011-2014 Samsung Electronics Co., Ltd. +// http://www.samsung.com/ +// +// Exynos - CPU PMU(Power Management Unit) support + +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/mfd/core.h> +#include <linux/mfd/syscon.h> +#include <linux/platform_device.h> +#include <linux/delay.h> + +#include <linux/soc/samsung/exynos-regs-pmu.h> +#include <linux/soc/samsung/exynos-pmu.h> + +#include "exynos-pmu.h" + +struct exynos_pmu_context { + struct device *dev; + const struct exynos_pmu_data *pmu_data; +}; + +void __iomem *pmu_base_addr; +static struct exynos_pmu_context *pmu_context; + +void pmu_raw_writel(u32 val, u32 offset) +{ + writel_relaxed(val, pmu_base_addr + offset); +} + +u32 pmu_raw_readl(u32 offset) +{ + return readl_relaxed(pmu_base_addr + offset); +} + +void exynos_sys_powerdown_conf(enum sys_powerdown mode) +{ + unsigned int i; + const struct exynos_pmu_data *pmu_data; + + if (!pmu_context || !pmu_context->pmu_data) + return; + + pmu_data = pmu_context->pmu_data; + + if (pmu_data->powerdown_conf) + pmu_data->powerdown_conf(mode); + + if (pmu_data->pmu_config) { + for (i = 0; (pmu_data->pmu_config[i].offset != PMU_TABLE_END); i++) + pmu_raw_writel(pmu_data->pmu_config[i].val[mode], + pmu_data->pmu_config[i].offset); + } + + if (pmu_data->powerdown_conf_extra) + pmu_data->powerdown_conf_extra(mode); +} + +/* + * Split the data between ARM architectures because it is relatively big + * and useless on other arch. + */ +#ifdef CONFIG_EXYNOS_PMU_ARM_DRIVERS +#define exynos_pmu_data_arm_ptr(data) (&data) +#else +#define exynos_pmu_data_arm_ptr(data) NULL +#endif + +/* + * PMU platform driver and devicetree bindings. + */ +static const struct of_device_id exynos_pmu_of_device_ids[] = { + { + .compatible = "samsung,exynos3250-pmu", + .data = exynos_pmu_data_arm_ptr(exynos3250_pmu_data), + }, { + .compatible = "samsung,exynos4210-pmu", + .data = exynos_pmu_data_arm_ptr(exynos4210_pmu_data), + }, { + .compatible = "samsung,exynos4412-pmu", + .data = exynos_pmu_data_arm_ptr(exynos4412_pmu_data), + }, { + .compatible = "samsung,exynos5250-pmu", + .data = exynos_pmu_data_arm_ptr(exynos5250_pmu_data), + }, { + .compatible = "samsung,exynos5410-pmu", + }, { + .compatible = "samsung,exynos5420-pmu", + .data = exynos_pmu_data_arm_ptr(exynos5420_pmu_data), + }, { + .compatible = "samsung,exynos5433-pmu", + }, { + .compatible = "samsung,exynos7-pmu", + }, { + .compatible = "samsung,exynos850-pmu", + }, + { /*sentinel*/ }, +}; + +static const struct mfd_cell exynos_pmu_devs[] = { + { .name = "exynos-clkout", }, +}; + +struct regmap *exynos_get_pmu_regmap(void) +{ + struct device_node *np = of_find_matching_node(NULL, + exynos_pmu_of_device_ids); + if (np) + return syscon_node_to_regmap(np); + return ERR_PTR(-ENODEV); +} +EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap); + +static int exynos_pmu_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + int ret; + + pmu_base_addr = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(pmu_base_addr)) + return PTR_ERR(pmu_base_addr); + + pmu_context = devm_kzalloc(&pdev->dev, + sizeof(struct exynos_pmu_context), + GFP_KERNEL); + if (!pmu_context) + return -ENOMEM; + pmu_context->dev = dev; + pmu_context->pmu_data = of_device_get_match_data(dev); + + if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init) + pmu_context->pmu_data->pmu_init(); + + platform_set_drvdata(pdev, pmu_context); + + ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, exynos_pmu_devs, + ARRAY_SIZE(exynos_pmu_devs), NULL, 0, NULL); + if (ret) + return ret; + + if (devm_of_platform_populate(dev)) + dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n"); + + dev_dbg(dev, "Exynos PMU Driver probe done\n"); + return 0; +} + +static struct platform_driver exynos_pmu_driver = { + .driver = { + .name = "exynos-pmu", + .of_match_table = exynos_pmu_of_device_ids, + }, + .probe = exynos_pmu_probe, +}; + +static int __init exynos_pmu_init(void) +{ + return platform_driver_register(&exynos_pmu_driver); + +} +postcore_initcall(exynos_pmu_init); |