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power: reset: pwr-mlxbf: add BlueField SoC power control driver

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

1) chip reset and
2) low power mode

Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Asmaa Mnebhi 2022-06-14 10:19:11 -04:00 committed by Sebastian Reichel
parent e08f8a1185
commit a4c0094fcf
3 changed files with 104 additions and 0 deletions
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6
drivers/power/reset/Kconfig
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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

1
drivers/power/reset/Makefile
View File

@ -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

97
drivers/power/reset/pwr-mlxbf.c Normal file
View File

@ -0,0 +1,97 @@
// 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");