From: Alexey Klimov <alexey.klimov@linaro.org>
To: "Sam Protsenko" <semen.protsenko@linaro.org>,
linux-samsung-soc@vger.kernel.org,
"Krzysztof Kozlowski" <krzk@kernel.org>,
"Peter Griffin" <peter.griffin@linaro.org>,
"André Draszik" <andre.draszik@linaro.org>,
"Conor Dooley" <conor+dt@kernel.org>,
"Alim Akhtar" <alim.akhtar@samsung.com>
Cc: Tudor Ambarus <tudor.ambarus@linaro.org>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
linux-arm-kernel@lists.infradead.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
Alexey Klimov <alexey.klimov@linaro.org>
Subject: [PATCH v3 4/6] soc: samsung: exynos-pmu: add Exynos850 CPU hotplug support
Date: Thu, 30 Apr 2026 02:56:54 +0100 [thread overview]
Message-ID: <20260430-exynos850-cpuhotplug-v3-4-fd6251d02a17@linaro.org> (raw)
In-Reply-To: <20260430-exynos850-cpuhotplug-v3-0-fd6251d02a17@linaro.org>
Add cpuhotplug support for Exynos850 platforms. This SoC requires
its own specific set of writes/updates to PMU and PMU interrupts
generation block in order to put a CPU or a group of CPUs into
a different sleep states or prepare these entities for a CPU_OFF
or wake-up out of idle state or after CPU online.
Without these writes/updates the CPU(s) wake-up or online fails.
While at this, also add description of Exynos850 PMU registers.
Signed-off-by: Alexey Klimov <alexey.klimov@linaro.org>
---
drivers/soc/samsung/Makefile | 2 +-
drivers/soc/samsung/exynos-pmu.c | 1 +
drivers/soc/samsung/exynos-pmu.h | 1 +
drivers/soc/samsung/exynos850-pmu.c | 79 +++++++++++++++++++++++++++++
include/linux/soc/samsung/exynos-regs-pmu.h | 5 ++
5 files changed, 87 insertions(+), 1 deletion(-)
diff --git a/drivers/soc/samsung/Makefile b/drivers/soc/samsung/Makefile
index 636a762608c9..7f544e3c1fcc 100644
--- a/drivers/soc/samsung/Makefile
+++ b/drivers/soc/samsung/Makefile
@@ -7,7 +7,7 @@ exynos_chipid-y += exynos-chipid.o exynos-asv.o
obj-$(CONFIG_EXYNOS_USI) += exynos-usi.o
obj-$(CONFIG_EXYNOS_PMU) += exynos_pmu.o
-exynos_pmu-y += exynos-pmu.o gs101-pmu.o
+exynos_pmu-y += exynos-pmu.o gs101-pmu.o exynos850-pmu.o
obj-$(CONFIG_EXYNOS_PMU_ARM_DRIVERS) += exynos3250-pmu.o exynos4-pmu.o \
exynos5250-pmu.o exynos5420-pmu.o
diff --git a/drivers/soc/samsung/exynos-pmu.c b/drivers/soc/samsung/exynos-pmu.c
index 660416c0db43..9dddf4759ab5 100644
--- a/drivers/soc/samsung/exynos-pmu.c
+++ b/drivers/soc/samsung/exynos-pmu.c
@@ -133,6 +133,7 @@ static const struct of_device_id exynos_pmu_of_device_ids[] = {
.compatible = "samsung,exynos7-pmu",
}, {
.compatible = "samsung,exynos850-pmu",
+ .data = &exynos850_pmu_data,
},
{ /*sentinel*/ },
};
diff --git a/drivers/soc/samsung/exynos-pmu.h b/drivers/soc/samsung/exynos-pmu.h
index 186299a049a8..4202d3cd94c9 100644
--- a/drivers/soc/samsung/exynos-pmu.h
+++ b/drivers/soc/samsung/exynos-pmu.h
@@ -102,6 +102,7 @@ extern const struct exynos_pmu_data exynos5250_pmu_data;
extern const struct exynos_pmu_data exynos5420_pmu_data;
#endif
extern const struct exynos_pmu_data gs101_pmu_data;
+extern const struct exynos_pmu_data exynos850_pmu_data;
extern void pmu_raw_writel(u32 val, u32 offset);
extern u32 pmu_raw_readl(u32 offset);
diff --git a/drivers/soc/samsung/exynos850-pmu.c b/drivers/soc/samsung/exynos850-pmu.c
new file mode 100644
index 000000000000..7a1ea45810bd
--- /dev/null
+++ b/drivers/soc/samsung/exynos850-pmu.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2026 Linaro Ltd.
+ *
+ * Exynos850 PMU support
+ */
+
+#include <linux/soc/samsung/exynos-pmu.h>
+#include <linux/soc/samsung/exynos-regs-pmu.h>
+#include <linux/regmap.h>
+#include <asm/cputype.h>
+
+#include "exynos-pmu.h"
+
+static int exynos850_cpu_pmu_offline(struct exynos_pmu_context *pmu_context, unsigned int cpu)
+ __must_hold(&pmu_context->cpupm_lock)
+{
+ u32 this_cluster = MPIDR_AFFINITY_LEVEL(read_cpuid_mpidr(), 2);
+ u32 cluster_cpu = MPIDR_AFFINITY_LEVEL(read_cpuid_mpidr(), 1);
+ unsigned int cpuhint = smp_processor_id();
+ u32 reg, mask;
+
+ /* set cpu inform hint */
+ regmap_write(pmu_context->pmureg, EXYNOS850_CPU_INFORM(cpuhint),
+ CPU_INFORM_C2);
+
+ mask = BIT(cpu);
+ regmap_update_bits(pmu_context->pmuintrgen, EXYNOS_GRP2_INTR_BID_ENABLE,
+ mask, BIT(cpu));
+
+ regmap_read(pmu_context->pmuintrgen, EXYNOS_GRP1_INTR_BID_UPEND, ®);
+ regmap_write(pmu_context->pmuintrgen, EXYNOS_GRP1_INTR_BID_CLEAR,
+ reg & mask);
+
+ mask = (BIT(cpu + 8));
+ regmap_read(pmu_context->pmuintrgen, EXYNOS_GRP1_INTR_BID_UPEND, ®);
+ regmap_write(pmu_context->pmuintrgen, EXYNOS_GRP1_INTR_BID_CLEAR,
+ reg & mask);
+
+ regmap_update_bits(pmu_context->pmureg,
+ EXYNOS850_CLUSTER_CPU_INT_EN(this_cluster, cluster_cpu),
+ 1 << 3, 1 << 3);
+ return 0;
+}
+
+static int exynos850_cpu_pmu_online(struct exynos_pmu_context *pmu_context, unsigned int cpu)
+ __must_hold(&pmu_context->cpupm_lock)
+{
+ u32 this_cluster = MPIDR_AFFINITY_LEVEL(read_cpuid_mpidr(), 2);
+ u32 cluster_cpu = MPIDR_AFFINITY_LEVEL(read_cpuid_mpidr(), 1);
+ unsigned int cpuhint = smp_processor_id();
+ u32 reg, mask;
+
+ /* clear cpu inform hint */
+ regmap_write(pmu_context->pmureg, EXYNOS850_CPU_INFORM(cpuhint),
+ CPU_INFORM_CLEAR);
+
+ mask = BIT(cpu);
+
+ regmap_update_bits(pmu_context->pmuintrgen, EXYNOS_GRP2_INTR_BID_ENABLE,
+ mask, (0 << cpu));
+
+ regmap_read(pmu_context->pmuintrgen, EXYNOS_GRP2_INTR_BID_UPEND, ®);
+
+ regmap_write(pmu_context->pmuintrgen, EXYNOS_GRP2_INTR_BID_CLEAR,
+ reg & mask);
+
+ regmap_update_bits(pmu_context->pmureg,
+ EXYNOS850_CLUSTER_CPU_INT_EN(this_cluster, cluster_cpu),
+ 1 << 3, 0 << 3);
+ return 0;
+}
+
+const struct exynos_pmu_data exynos850_pmu_data = {
+ .pmu_cpuhp = true,
+ .cpu_pmu_offline = exynos850_cpu_pmu_offline,
+ .cpu_pmu_online = exynos850_cpu_pmu_online,
+};
+
diff --git a/include/linux/soc/samsung/exynos-regs-pmu.h b/include/linux/soc/samsung/exynos-regs-pmu.h
index 9c4d3da41dbf..93c4d724c8ea 100644
--- a/include/linux/soc/samsung/exynos-regs-pmu.h
+++ b/include/linux/soc/samsung/exynos-regs-pmu.h
@@ -1015,6 +1015,11 @@
#define EXYNOS_GRP2_INTR_BID_UPEND (0x0208)
#define EXYNOS_GRP2_INTR_BID_CLEAR (0x020c)
+/* Exynos850 PMU Alive */
+#define EXYNOS850_CPU_INFORM(cpu) (0x0860 + ((cpu) & 7) * 4)
+#define EXYNOS850_CLUSTER_CPU_OFFSET(cl, cpu) (0x1000 + ((cl * 0x400) + ((cpu) * 0x80)))
+#define EXYNOS850_CLUSTER_CPU_INT_EN(cl, cpu) (EXYNOS850_CLUSTER_CPU_OFFSET(cl, cpu) + 0x44)
+
/* exynosautov920 */
#define EXYNOSAUTOV920_PHY_CTRL_USB20 (0x0710)
#define EXYNOSAUTOV920_PHY_CTRL_USB31 (0x0714)
--
2.51.0
next prev parent reply other threads:[~2026-04-30 1:57 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-30 1:56 [PATCH v3 0/6] Exynos-pmu: Generalise cpu{hotplug,idle},PMU intr gen and add Exynos850 CPU hotplug Alexey Klimov
2026-04-30 1:56 ` [PATCH v3 1/6] dt-bindings: soc: move,rename google,gs101-pmu-intr-gen and add exynos850 Alexey Klimov
2026-04-30 1:56 ` [PATCH v3 2/6] dt-bindings: soc: samsung: exynos-pmu: Require pmu-intr-gen-syscon for Exynos850 Alexey Klimov
2026-05-07 18:01 ` Rob Herring (Arm)
2026-05-08 20:49 ` Peter Griffin
2026-04-30 1:56 ` [PATCH v3 3/6] soc: samsung: exynos-pmu: generalise gs101-specific cpu{idle,hotplug} for Exynos SoCs Alexey Klimov
2026-05-08 20:37 ` Peter Griffin
2026-04-30 1:56 ` Alexey Klimov [this message]
2026-04-30 10:27 ` [PATCH v3 4/6] soc: samsung: exynos-pmu: add Exynos850 CPU hotplug support Alexey Klimov
2026-04-30 1:56 ` [PATCH v3 5/6] MAINTAINERS: add Exynos850 PMU entry Alexey Klimov
2026-04-30 1:56 ` [PATCH v3 6/6] arm64: dts: exynos850: add PMU interrupt generation node Alexey Klimov
2026-05-08 20:37 ` Peter Griffin
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