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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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598995027b
Some additional register writes are required when hotplugging CPUs on gs101, without these the system hangs when hotplugging. Specifically a CPU_INFORM register needs to be programmed with a hint value which is used by the EL3 firmware (el3mon) and the pmu-intr-gen registers need to be programmed. With this patch applied, and corresponding DT update CPU hotplug now works as expected. e.g. echo 0 > /sys/devices/system/cpu/cpu6/online echo 1 > /sys/devices/system/cpu/cpu6/online Note: to maintain compatibility with older DTs that didn't specify pmu-intr-gen phandle only a warning is issued if the syscon can't be obtained. Signed-off-by: Peter Griffin <peter.griffin@linaro.org> Link: https://lore.kernel.org/r/20250506-contrib-pg-cpu-hotplug-suspend2ram-fixes-v1-v4-5-9f64a2657316@linaro.org [krzk: few blank line and white-space alignment fixes from checkpatch] Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
47 lines
1.2 KiB
C
47 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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bool pmu_cpuhp;
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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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