power: reset: Add a driver for the Microsemi Ocelot reset (6ab739bc) · Commits · 戴 / test

drivers/power/reset/Kconfig

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		@@ -104,6 +104,13 @@ config POWER_RESET_MSM
		help
		Power off and restart support for Qualcomm boards.

		config POWER_RESET_OCELOT_RESET
		bool "Microsemi Ocelot reset driver"
		depends on MSCC_OCELOT \|\| COMPILE_TEST
		select MFD_SYSCON
		help
		This driver supports restart for Microsemi Ocelot SoC.

		config POWER_RESET_PIIX4_POWEROFF
		tristate "Intel PIIX4 power-off driver"
		depends on PCI

drivers/power/reset/Makefile

+1 −0

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		@@ -11,6 +11,7 @@ obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
		obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
		obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
		obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
		obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
		obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
		obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
		obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o

drivers/power/reset/ocelot-reset.c

0 → 100644

+88 −0

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		// SPDX-License-Identifier: (GPL-2.0 OR MIT)
		/*
		* Microsemi MIPS SoC reset driver
		*
		* License: Dual MIT/GPL
		* Copyright (c) 2017 Microsemi Corporation
		*/
		#include <linux/delay.h>
		#include <linux/io.h>
		#include <linux/notifier.h>
		#include <linux/mfd/syscon.h>
		#include <linux/of_address.h>
		#include <linux/of_device.h>
		#include <linux/platform_device.h>
		#include <linux/reboot.h>
		#include <linux/regmap.h>

		struct ocelot_reset_context {
		void __iomem *base;
		struct regmap *cpu_ctrl;
		struct notifier_block restart_handler;
		};

		#define ICPU_CFG_CPU_SYSTEM_CTRL_RESET 0x20
		#define CORE_RST_PROTECT BIT(2)

		#define SOFT_CHIP_RST BIT(0)

		static int ocelot_restart_handle(struct notifier_block *this,
		unsigned long mode, void *cmd)
		{
		struct ocelot_reset_context *ctx = container_of(this, struct
		ocelot_reset_context,
		restart_handler);

		/* Make sure the core is not protected from reset */
		regmap_update_bits(ctx->cpu_ctrl, ICPU_CFG_CPU_SYSTEM_CTRL_RESET,
		CORE_RST_PROTECT, 0);

		writel(SOFT_CHIP_RST, ctx->base);

		pr_emerg("Unable to restart system\n");
		return NOTIFY_DONE;
		}

		static int ocelot_reset_probe(struct platform_device *pdev)
		{
		struct ocelot_reset_context *ctx;
		struct resource *res;

		struct device *dev = &pdev->dev;
		int err;

		ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
		if (!ctx)
		return -ENOMEM;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		ctx->base = devm_ioremap_resource(dev, res);
		if (IS_ERR(ctx->base))
		return PTR_ERR(ctx->base);

		ctx->cpu_ctrl = syscon_regmap_lookup_by_compatible("mscc,ocelot-cpu-syscon");
		if (IS_ERR(ctx->cpu_ctrl))
		return PTR_ERR(ctx->cpu_ctrl);

		ctx->restart_handler.notifier_call = ocelot_restart_handle;
		ctx->restart_handler.priority = 192;
		err = register_restart_handler(&ctx->restart_handler);
		if (err)
		dev_err(dev, "can't register restart notifier (err=%d)\n", err);

		return err;
		}

		static const struct of_device_id ocelot_reset_of_match[] = {
		{ .compatible = "mscc,ocelot-chip-reset" },
		{}
		};

		static struct platform_driver ocelot_reset_driver = {
		.probe = ocelot_reset_probe,
		.driver = {
		.name = "ocelot-chip-reset",
		.of_match_table = ocelot_reset_of_match,
		},
		};
		builtin_platform_driver(ocelot_reset_driver);

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