Commit a4c0094f authored by Asmaa Mnebhi's avatar Asmaa Mnebhi Committed by Sebastian Reichel
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power: reset: pwr-mlxbf: add BlueField SoC power control driver 



This driver supports handling 2 BlueField power states controlled by
GPIO interrupts:

1) chip reset and
2) low power mode

Signed-off-by: default avatarAsmaa Mnebhi <asmaa@nvidia.com>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent e08f8a11

drivers/power/reset/Kconfig

+6 −0
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@@ -297,4 +297,10 @@ config NVMEM_REBOOT_MODE 
	  then the bootloader can read it and take different

	  action according to the mode.



config POWER_MLXBF

	tristate "Mellanox BlueField power handling driver"

	depends on (GPIO_MLXBF2 && ACPI)

	help

	  This driver supports reset or low power mode handling for Mellanox BlueField.



endif

drivers/power/reset/Makefile

+1 −0
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@@ -35,3 +35,4 @@ obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o 
obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o

obj-$(CONFIG_POWER_RESET_SC27XX) += sc27xx-poweroff.o

obj-$(CONFIG_NVMEM_REBOOT_MODE) += nvmem-reboot-mode.o

obj-$(CONFIG_POWER_MLXBF) += pwr-mlxbf.o

drivers/power/reset/pwr-mlxbf.c

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+97 −0
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// SPDX-License-Identifier: GPL-2.0-only or BSD-3-Clause



/*

 *  Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES.

 */



#include <linux/acpi.h>

#include <linux/device.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/mod_devicetable.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/pm.h>

#include <linux/reboot.h>

#include <linux/types.h>



const char *rst_pwr_hid = "MLNXBF24";

const char *low_pwr_hid = "MLNXBF29";



struct pwr_mlxbf {

	struct work_struct send_work;

	const char *hid;

};



static void pwr_mlxbf_send_work(struct work_struct *work)

{

	acpi_bus_generate_netlink_event("button/power.*", "Power Button", 0x80, 1);

}



static irqreturn_t pwr_mlxbf_irq(int irq, void *ptr)

{

	struct pwr_mlxbf *priv = ptr;



	if (!strncmp(priv->hid, rst_pwr_hid, 8))

		emergency_restart();



	if (!strncmp(priv->hid, low_pwr_hid, 8))

		schedule_work(&priv->send_work);



	return IRQ_HANDLED;

}



static int pwr_mlxbf_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct acpi_device *adev;

	struct pwr_mlxbf *priv;

	const char *hid;

	int irq, err;



	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);

	if (!priv)

		return -ENOMEM;



	adev = ACPI_COMPANION(dev);

	if (!adev)

		return -ENXIO;



	hid = acpi_device_hid(adev);

	priv->hid = hid;



	irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);

	if (irq < 0)

		return dev_err_probe(dev, irq, "Error getting %s irq.\n", priv->hid);



	err = devm_work_autocancel(dev, &priv->send_work, pwr_mlxbf_send_work);

	if (err)

		return err;



	err = devm_request_irq(dev, irq, pwr_mlxbf_irq, 0, hid, priv);

	if (err)

		dev_err(dev, "Failed request of %s irq\n", priv->hid);



	return err;

}



static const struct acpi_device_id __maybe_unused pwr_mlxbf_acpi_match[] = {

	{ "MLNXBF24", 0 },

	{ "MLNXBF29", 0 },

	{},

};

MODULE_DEVICE_TABLE(acpi, pwr_mlxbf_acpi_match);



static struct platform_driver pwr_mlxbf_driver = {

	.driver = {

		.name = "pwr_mlxbf",

		.acpi_match_table = pwr_mlxbf_acpi_match,

	},

	.probe    = pwr_mlxbf_probe,

};



module_platform_driver(pwr_mlxbf_driver);



MODULE_DESCRIPTION("Mellanox BlueField power driver");

MODULE_AUTHOR("Asmaa Mnebhi <asmaa@nvidia.com>");

MODULE_LICENSE("Dual BSD/GPL");