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Fri, 13 Dec 2024 08:45:22 -0800 (PST) From: Peter Griffin Date: Fri, 13 Dec 2024 16:44:41 +0000 Subject: [PATCH 4/4] soc: samsung: exynos-pmu: enable CPU hotplug support for gs101 Precedence: bulk X-Mailing-List: linux-samsung-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241213-contrib-pg-cpu-hotplug-suspend2ram-fixes-v1-v1-4-c72978f63713@linaro.org> References: <20241213-contrib-pg-cpu-hotplug-suspend2ram-fixes-v1-v1-0-c72978f63713@linaro.org> In-Reply-To: <20241213-contrib-pg-cpu-hotplug-suspend2ram-fixes-v1-v1-0-c72978f63713@linaro.org> To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alim Akhtar , Krzysztof Kozlowski , Lee Jones Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, tudor.ambarus@linaro.org, andre.draszik@linaro.org, willmcvicker@google.com, kernel-team@android.com, Peter Griffin X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; 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a=openpgp; fpr=0EFC8E6F5578750D56B549FCCEE8B8D6023472BA 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 register region only a warning is issued if the registers can't be mapped, and the old behaviour is maintained. Signed-off-by: Peter Griffin --- drivers/soc/samsung/exynos-pmu.c | 73 ++++++++++++++++++++++++++++- drivers/soc/samsung/exynos-pmu.h | 1 + include/linux/soc/samsung/exynos-regs-pmu.h | 11 +++++ 3 files changed, 84 insertions(+), 1 deletion(-) diff --git a/drivers/soc/samsung/exynos-pmu.c b/drivers/soc/samsung/exynos-pmu.c index d8c53cec7f37..68eb4eb3813b 100644 --- a/drivers/soc/samsung/exynos-pmu.c +++ b/drivers/soc/samsung/exynos-pmu.c @@ -6,6 +6,7 @@ // Exynos - CPU PMU(Power Management Unit) support #include +#include #include #include #include @@ -32,6 +33,7 @@ struct exynos_pmu_context { struct device *dev; const struct exynos_pmu_data *pmu_data; struct regmap *pmureg; + void __iomem *pmuintrgen_base; }; void __iomem *pmu_base_addr; @@ -221,7 +223,8 @@ static const struct regmap_config regmap_smccfg = { }; static const struct exynos_pmu_data gs101_pmu_data = { - .pmu_secure = true + .pmu_secure = true, + .pmu_cpuhp = true, }; /* @@ -325,6 +328,52 @@ struct regmap *exynos_get_pmu_regmap_by_phandle(struct device_node *np, } EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap_by_phandle); +/* + * CPU_INFORM register hint values which are used by + * EL3 firmware (el3mon). + */ +#define CPU_INFORM_CLEAR 0 +#define CPU_INFORM_C2 1 + +static int cpuhp_pmu_online(unsigned int cpu) +{ + void __iomem *base = pmu_context->pmuintrgen_base; + u32 reg; + u32 mask; + + /* clear cpu inform hint */ + regmap_write(pmu_context->pmureg, GS101_CPU_INFORM(cpu), + CPU_INFORM_CLEAR); + + mask = (1 << cpu); + + writel(((0 << cpu) & mask), base + GS101_GRP2_INTR_BID_ENABLE); + + reg = readl(base + GS101_GRP2_INTR_BID_UPEND) & mask; + writel(reg & mask, base + GS101_GRP2_INTR_BID_CLEAR); + + return 0; +} + +static int cpuhp_pmu_offline(unsigned int cpu) +{ + void __iomem *base = pmu_context->pmuintrgen_base; + u32 reg, mask; + + /* set cpu inform hint */ + regmap_write(pmu_context->pmureg, GS101_CPU_INFORM(cpu), + CPU_INFORM_C2); + + writel((1 << cpu), base + GS101_GRP2_INTR_BID_ENABLE); + + mask = ((1 << cpu) | (1 << (cpu+8))); + + reg = readl(base + GS101_GRP1_INTR_BID_UPEND) & mask; + writel(reg & mask, base + GS101_GRP1_INTR_BID_CLEAR); + + return 0; +} + static int exynos_pmu_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -377,6 +426,28 @@ static int exynos_pmu_probe(struct platform_device *pdev) pmu_context->pmureg = regmap; pmu_context->dev = dev; + if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_cpuhp) { + + pmu_context->pmuintrgen_base = + devm_platform_ioremap_resource_byname(pdev, "pmu-intr-gen"); + /* + * To maintain support for older DTs that didn't specify pmu-intr-gen + * register region, just issue a warning rather than fail to probe. + */ + if (IS_ERR(pmu_context->pmuintrgen_base)) { + dev_warn(&pdev->dev, + "failed to map pmu-intr-gen registers\n"); + } else { + cpuhp_setup_state(CPUHP_BP_PREPARE_DYN, + "soc/exynos-pmu:prepare", + cpuhp_pmu_online, NULL); + + cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, + "soc/exynos-pmu:online", + NULL, cpuhp_pmu_offline); + } + } + if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init) pmu_context->pmu_data->pmu_init(); diff --git a/drivers/soc/samsung/exynos-pmu.h b/drivers/soc/samsung/exynos-pmu.h index 0a49a2c9a08e..0938bb4fe15f 100644 --- a/drivers/soc/samsung/exynos-pmu.h +++ b/drivers/soc/samsung/exynos-pmu.h @@ -22,6 +22,7 @@ struct exynos_pmu_data { const struct exynos_pmu_conf *pmu_config; const struct exynos_pmu_conf *pmu_config_extra; bool pmu_secure; + bool pmu_cpuhp; void (*pmu_init)(void); void (*powerdown_conf)(enum sys_powerdown); diff --git a/include/linux/soc/samsung/exynos-regs-pmu.h b/include/linux/soc/samsung/exynos-regs-pmu.h index ce1a3790d6fb..0d5a17ea8fb8 100644 --- a/include/linux/soc/samsung/exynos-regs-pmu.h +++ b/include/linux/soc/samsung/exynos-regs-pmu.h @@ -658,9 +658,20 @@ #define EXYNOS5433_PAD_RETENTION_FSYSGENIO_OPTION (0x32A8) /* For Tensor GS101 */ +/* PMU ALIVE */ #define GS101_SYSIP_DAT0 (0x810) +#define GS101_CPU0_INFORM (0x860) +#define GS101_CPU_INFORM(cpu) \ + (GS101_CPU0_INFORM + (cpu*4)) #define GS101_SYSTEM_CONFIGURATION (0x3A00) #define GS101_PHY_CTRL_USB20 (0x3EB0) #define GS101_PHY_CTRL_USBDP (0x3EB4) +/* PMU INTR GEN */ +#define GS101_GRP1_INTR_BID_UPEND (0x0108) +#define GS101_GRP1_INTR_BID_CLEAR (0x010c) +#define GS101_GRP2_INTR_BID_ENABLE (0x0200) +#define GS101_GRP2_INTR_BID_UPEND (0x0208) +#define GS101_GRP2_INTR_BID_CLEAR (0x020c) + #endif /* __LINUX_SOC_EXYNOS_REGS_PMU_H */