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Message-Id: <20250611031023.28769-4-nick.hu@sifive.com>
Date: Wed, 11 Jun 2025 11:10:22 +0800
From: Nick Hu <nick.hu@...ive.com>
To: conor+dt@...nel.org,
krzk+dt@...nel.org,
Alexandre Ghiti <alex@...ti.fr>,
linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org,
linux-riscv@...ts.infradead.org
Cc: Nick Hu <nick.hu@...ive.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Samuel Holland <samuel.holland@...ive.com>
Subject: [PATCH v2 3/3] cpuidle: Add SiFive power provider
The SiFive DMC is the power provider of the devices that inside the
SiFive CPU power domains, which include Tile, Cluster and Core Complex
power domains. Before the cpu entering the firmware-based idle state,
each devices that inside the corresponding domain should be suspended
properly. So this driver will create the power provider and set the
correct idle state.
Signed-off-by: Nick Hu <nick.hu@...ive.com>
---
drivers/cpuidle/Kconfig.riscv | 11 +++
drivers/cpuidle/Makefile | 1 +
drivers/cpuidle/cpuidle-sifive-dmc-pd.c | 102 ++++++++++++++++++++++++
3 files changed, 114 insertions(+)
create mode 100644 drivers/cpuidle/cpuidle-sifive-dmc-pd.c
diff --git a/drivers/cpuidle/Kconfig.riscv b/drivers/cpuidle/Kconfig.riscv
index 78518c26af74..af802afefa21 100644
--- a/drivers/cpuidle/Kconfig.riscv
+++ b/drivers/cpuidle/Kconfig.riscv
@@ -13,3 +13,14 @@ config RISCV_SBI_CPUIDLE
Select this option to enable RISC-V SBI firmware based CPU idle
driver for RISC-V systems. This drivers also supports hierarchical
DT based layout of the idle state.
+
+config SIFIVE_DMC_PD_CPUIDLE
+ bool "SiFive DMC SBI PD Provider Driver"
+ depends on ARCH_SIFIVE
+ select PM_GENERIC_DOMAINS_OF
+ select RISCV_SBI_CPUIDLE
+ default y
+ help
+ Select this option to enable SiFive DMC SBI PD Provider driver.
+ This driver will create the genpd provider and work with the
+ RISC-V SBI firmware based CPU idle driver.
diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
index 1de9e92c5b0f..1f8e01b415e8 100644
--- a/drivers/cpuidle/Makefile
+++ b/drivers/cpuidle/Makefile
@@ -42,3 +42,4 @@ obj-$(CONFIG_POWERNV_CPUIDLE) += cpuidle-powernv.o
###############################################################################
# RISC-V drivers
obj-$(CONFIG_RISCV_SBI_CPUIDLE) += cpuidle-riscv-sbi.o
+obj-$(CONFIG_SIFIVE_DMC_PD_CPUIDLE) += cpuidle-sifive-dmc-pd.o
diff --git a/drivers/cpuidle/cpuidle-sifive-dmc-pd.c b/drivers/cpuidle/cpuidle-sifive-dmc-pd.c
new file mode 100644
index 000000000000..1c6b2131e573
--- /dev/null
+++ b/drivers/cpuidle/cpuidle-sifive-dmc-pd.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SiFive CPUIDLE SBI PD driver
+ */
+
+#define pr_fmt(fmt) "sifive_cpuidle_sbi_pd: " fmt
+
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
+
+#include "cpuidle-riscv-sbi.h"
+#include "dt_idle_genpd.h"
+
+static void sifive_dmc_remove(struct platform_device *pdev)
+{
+ struct generic_pm_domain *pd = platform_get_drvdata(pdev);
+ struct device *dev = &pdev->dev;
+
+ pm_runtime_disable(dev);
+ of_genpd_del_provider(dev->of_node);
+ pm_genpd_remove(pd);
+ dt_idle_pd_free(pd);
+}
+
+static int sifive_dmc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct generic_pm_domain *pd;
+ struct of_phandle_args child, parent;
+ int ret = -ENOMEM;
+
+ pd = dt_idle_pd_alloc(np, sbi_dt_parse_state_node);
+ if (!pd)
+ goto fail;
+
+ pd->flags |= GENPD_FLAG_IRQ_SAFE | GENPD_FLAG_CPU_DOMAIN;
+ pd->power_off = sbi_cpuidle_pd_power_off;
+
+ ret = pm_genpd_init(pd, &pm_domain_cpu_gov, false);
+ if (ret)
+ goto free_pd;
+
+ ret = of_genpd_add_provider_simple(np, pd);
+ if (ret)
+ goto remove_pd;
+
+ if (of_parse_phandle_with_args(np, "power-domains",
+ "#power-domain-cells", 0,
+ &parent) == 0) {
+ child.np = np;
+ child.args_count = 0;
+
+ if (of_genpd_add_subdomain(&parent, &child))
+ pr_warn("%pOF failed to add subdomain: %pOF\n",
+ parent.np, child.np);
+ else
+ pr_debug("%pOF has a child subdomain: %pOF.\n",
+ parent.np, child.np);
+ }
+
+ platform_set_drvdata(pdev, pd);
+ pm_runtime_enable(dev);
+ pr_info("%s create success\n", pd->name);
+ return 0;
+
+remove_pd:
+ pm_genpd_remove(pd);
+free_pd:
+ dt_idle_pd_free(pd);
+fail:
+ pr_info("%s create fail\n", pd->name);
+
+ return ret;
+}
+
+static const struct of_device_id sifive_dmc_of_match[] = {
+ { .compatible = "sifive,tmc1", },
+ { .compatible = "sifive,tmc0", },
+ { .compatible = "sifive,smc1", },
+ { .compatible = "sifive,smc0", },
+ { .compatible = "sifive,cmc2", },
+ {}
+};
+
+static struct platform_driver sifive_dmc_driver = {
+ .probe = sifive_dmc_probe,
+ .remove = sifive_dmc_remove,
+ .driver = {
+ .name = "sifive_dmc",
+ .of_match_table = sifive_dmc_of_match,
+ .suppress_bind_attrs = true,
+ },
+};
+
+static int __init sifive_dmc_init(void)
+{
+ return platform_driver_register(&sifive_dmc_driver);
+}
+arch_initcall(sifive_dmc_init);
--
2.17.1
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