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authorAsmaa Mnebhi <asmaa@nvidia.com>2022-06-14 16:19:11 +0200
committerSebastian Reichel <sebastian.reichel@collabora.com>2022-06-17 17:05:28 +0200
commita4c0094fcf7628f31bf82a7b25e7f51ee5a22324 (patch)
treee860c0e6649e6784728a9d2ba3a982c695cf9559 /drivers/power
parentpower: supply: ab8500: Exit maintenance if too low voltage (diff)
downloadlinux-a4c0094fcf7628f31bf82a7b25e7f51ee5a22324.tar.xz
linux-a4c0094fcf7628f31bf82a7b25e7f51ee5a22324.zip
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: Asmaa Mnebhi <asmaa@nvidia.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/reset/Kconfig6
-rw-r--r--drivers/power/reset/Makefile1
-rw-r--r--drivers/power/reset/pwr-mlxbf.c97
3 files changed, 104 insertions, 0 deletions
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index 4b563db3ab3e..a8c46ba5878f 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -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
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index f606a2f60539..0a39424fc558 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -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
diff --git a/drivers/power/reset/pwr-mlxbf.c b/drivers/power/reset/pwr-mlxbf.c
new file mode 100644
index 000000000000..c1f9987834a2
--- /dev/null
+++ b/drivers/power/reset/pwr-mlxbf.c
@@ -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");