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Some Exynos based SoCs like Tensor gs101 protect the PMU registers for security hardening reasons so that they are only write accessible in el3 via an SMC call. As most Exynos drivers that need to write PMU registers currently obtain a regmap via syscon (phys, pinctrl, watchdog). Support for the above usecase is implemented in this driver using a custom regmap similar to syscon to handle the SMC call. Platforms that don't secure PMU registers, get a mmio regmap like before. As regmaps abstract out the underlying register access changes to the leaf drivers are minimal. A new API exynos_get_pmu_regmap_by_phandle() is provided for leaf drivers that currently use syscon_regmap_lookup_by_phandle(). This also handles deferred probing. Tested-by: Sam Protsenko <semen.protsenko@linaro.org> Tested-by: Alexey Klimov <alexey.klimov@linaro.org> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Peter Griffin <peter.griffin@linaro.org> Link: https://lore.kernel.org/r/20240220220613.797068-2-peter.griffin@linaro.org Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2015 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Header for Exynos PMU Driver support
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*/
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#ifndef __EXYNOS_PMU_H
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#define __EXYNOS_PMU_H
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#include <linux/io.h>
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#define PMU_TABLE_END (-1U)
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struct exynos_pmu_conf {
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unsigned int offset;
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u8 val[NUM_SYS_POWERDOWN];
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};
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struct exynos_pmu_data {
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const struct exynos_pmu_conf *pmu_config;
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const struct exynos_pmu_conf *pmu_config_extra;
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bool pmu_secure;
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void (*pmu_init)(void);
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void (*powerdown_conf)(enum sys_powerdown);
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void (*powerdown_conf_extra)(enum sys_powerdown);
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};
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extern void __iomem *pmu_base_addr;
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#ifdef CONFIG_EXYNOS_PMU_ARM_DRIVERS
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/* list of all exported SoC specific data */
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extern const struct exynos_pmu_data exynos3250_pmu_data;
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extern const struct exynos_pmu_data exynos4210_pmu_data;
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extern const struct exynos_pmu_data exynos4212_pmu_data;
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extern const struct exynos_pmu_data exynos4412_pmu_data;
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extern const struct exynos_pmu_data exynos5250_pmu_data;
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extern const struct exynos_pmu_data exynos5420_pmu_data;
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#endif
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extern void pmu_raw_writel(u32 val, u32 offset);
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extern u32 pmu_raw_readl(u32 offset);
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#endif /* __EXYNOS_PMU_H */
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