Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 983 insertions, 0 deletions

diff --git a/drivers/platform/mellanox/Kconfig b/drivers/platform/mellanox/Kconfig
new file mode 100644
index 000000000..cd8a90846
--- /dev/null
+++ b/drivers/platform/mellanox/Kconfig
@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Platform support for Mellanox hardware
+#
+
+menuconfig MELLANOX_PLATFORM
+	bool "Platform support for Mellanox hardware"
+	depends on X86 || ARM || COMPILE_TEST
+	---help---
+	  Say Y here to get to see options for platform support for
+	  Mellanox systems. This option alone does not add any kernel code.
+
+	  If you say N, all options in this submenu will be skipped and disabled.
+
+if MELLANOX_PLATFORM
+
+config MLXREG_HOTPLUG
+	tristate "Mellanox platform hotplug driver support"
+	depends on REGMAP
+	depends on HWMON
+	depends on I2C
+	---help---
+	  This driver handles hot-plug events for the power suppliers, power
+	  cables and fans on the wide range Mellanox IB and Ethernet systems.
+
+config MLXREG_IO
+	tristate "Mellanox platform register access driver support"
+	depends on REGMAP
+	depends on HWMON
+	help
+	  This driver allows access to Mellanox programmable device register
+	  space through sysfs interface. The sets of registers for sysfs access
+	  are defined per system type bases and include the registers related
+	  to system resets operation, system reset causes monitoring and some
+	  kinds of mux selection.
+
+endif # MELLANOX_PLATFORM
diff --git a/drivers/platform/mellanox/Makefile b/drivers/platform/mellanox/Makefile
new file mode 100644
index 000000000..57074d9c7
--- /dev/null
+++ b/drivers/platform/mellanox/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for linux/drivers/platform/mellanox
+# Mellanox Platform-Specific Drivers
+#
+obj-$(CONFIG_MLXREG_HOTPLUG)	+= mlxreg-hotplug.o
+obj-$(CONFIG_MLXREG_IO) += mlxreg-io.o
diff --git a/drivers/platform/mellanox/mlxreg-hotplug.c b/drivers/platform/mellanox/mlxreg-hotplug.c
new file mode 100644
index 000000000..d52c821b8
--- /dev/null
+++ b/drivers/platform/mellanox/mlxreg-hotplug.c
@@ -0,0 +1,694 @@
+/*
+ * Copyright (c) 2016-2018 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2016-2018 Vadim Pasternak <vadimp@mellanox.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_data/mlxreg.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/regmap.h>
+#include <linux/workqueue.h>
+
+/* Offset of event and mask registers from status register. */
+#define MLXREG_HOTPLUG_EVENT_OFF	1
+#define MLXREG_HOTPLUG_MASK_OFF		2
+#define MLXREG_HOTPLUG_AGGR_MASK_OFF	1
+
+/* ASIC good health mask. */
+#define MLXREG_HOTPLUG_GOOD_HEALTH_MASK	0x02
+
+#define MLXREG_HOTPLUG_ATTRS_MAX	24
+#define MLXREG_HOTPLUG_NOT_ASSERT	3
+
+/**
+ * struct mlxreg_hotplug_priv_data - platform private data:
+ * @irq: platform device interrupt number;
+ * @dev: basic device;
+ * @pdev: platform device;
+ * @plat: platform data;
+ * @regmap: register map handle;
+ * @dwork_irq: delayed work template;
+ * @lock: spin lock;
+ * @hwmon: hwmon device;
+ * @mlxreg_hotplug_attr: sysfs attributes array;
+ * @mlxreg_hotplug_dev_attr: sysfs sensor device attribute array;
+ * @group: sysfs attribute group;
+ * @groups: list of sysfs attribute group for hwmon registration;
+ * @cell: location of top aggregation interrupt register;
+ * @mask: top aggregation interrupt common mask;
+ * @aggr_cache: last value of aggregation register status;
+ * @after_probe: flag indication probing completion;
+ * @not_asserted: number of entries in workqueue with no signal assertion;
+ */
+struct mlxreg_hotplug_priv_data {
+	int irq;
+	struct device *dev;
+	struct platform_device *pdev;
+	struct mlxreg_hotplug_platform_data *plat;
+	struct regmap *regmap;
+	struct delayed_work dwork_irq;
+	spinlock_t lock; /* sync with interrupt */
+	struct device *hwmon;
+	struct attribute *mlxreg_hotplug_attr[MLXREG_HOTPLUG_ATTRS_MAX + 1];
+	struct sensor_device_attribute_2
+			mlxreg_hotplug_dev_attr[MLXREG_HOTPLUG_ATTRS_MAX];
+	struct attribute_group group;
+	const struct attribute_group *groups[2];
+	u32 cell;
+	u32 mask;
+	u32 aggr_cache;
+	bool after_probe;
+	u8 not_asserted;
+};
+
+static int mlxreg_hotplug_device_create(struct mlxreg_hotplug_priv_data *priv,
+					struct mlxreg_core_data *data)
+{
+	struct mlxreg_core_hotplug_platform_data *pdata;
+
+	/* Notify user by sending hwmon uevent. */
+	kobject_uevent(&priv->hwmon->kobj, KOBJ_CHANGE);
+
+	/*
+	 * Return if adapter number is negative. It could be in case hotplug
+	 * event is not associated with hotplug device.
+	 */
+	if (data->hpdev.nr < 0)
+		return 0;
+
+	pdata = dev_get_platdata(&priv->pdev->dev);
+	data->hpdev.adapter = i2c_get_adapter(data->hpdev.nr +
+					      pdata->shift_nr);
+	if (!data->hpdev.adapter) {
+		dev_err(priv->dev, "Failed to get adapter for bus %d\n",
+			data->hpdev.nr + pdata->shift_nr);
+		return -EFAULT;
+	}
+
+	data->hpdev.client = i2c_new_device(data->hpdev.adapter,
+					    data->hpdev.brdinfo);
+	if (!data->hpdev.client) {
+		dev_err(priv->dev, "Failed to create client %s at bus %d at addr 0x%02x\n",
+			data->hpdev.brdinfo->type, data->hpdev.nr +
+			pdata->shift_nr, data->hpdev.brdinfo->addr);
+
+		i2c_put_adapter(data->hpdev.adapter);
+		data->hpdev.adapter = NULL;
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+static void
+mlxreg_hotplug_device_destroy(struct mlxreg_hotplug_priv_data *priv,
+			      struct mlxreg_core_data *data)
+{
+	/* Notify user by sending hwmon uevent. */
+	kobject_uevent(&priv->hwmon->kobj, KOBJ_CHANGE);
+
+	if (data->hpdev.client) {
+		i2c_unregister_device(data->hpdev.client);
+		data->hpdev.client = NULL;
+	}
+
+	if (data->hpdev.adapter) {
+		i2c_put_adapter(data->hpdev.adapter);
+		data->hpdev.adapter = NULL;
+	}
+}
+
+static ssize_t mlxreg_hotplug_attr_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct mlxreg_hotplug_priv_data *priv = dev_get_drvdata(dev);
+	struct mlxreg_core_hotplug_platform_data *pdata;
+	int index = to_sensor_dev_attr_2(attr)->index;
+	int nr = to_sensor_dev_attr_2(attr)->nr;
+	struct mlxreg_core_item *item;
+	struct mlxreg_core_data *data;
+	u32 regval;
+	int ret;
+
+	pdata = dev_get_platdata(&priv->pdev->dev);
+	item = pdata->items + nr;
+	data = item->data + index;
+
+	ret = regmap_read(priv->regmap, data->reg, &regval);
+	if (ret)
+		return ret;
+
+	if (item->health) {
+		regval &= data->mask;
+	} else {
+		/* Bit = 0 : functional if item->inversed is true. */
+		if (item->inversed)
+			regval = !(regval & data->mask);
+		else
+			regval = !!(regval & data->mask);
+	}
+
+	return sprintf(buf, "%u\n", regval);
+}
+
+#define PRIV_ATTR(i) priv->mlxreg_hotplug_attr[i]
+#define PRIV_DEV_ATTR(i) priv->mlxreg_hotplug_dev_attr[i]
+
+static int mlxreg_hotplug_attr_init(struct mlxreg_hotplug_priv_data *priv)
+{
+	struct mlxreg_core_hotplug_platform_data *pdata;
+	struct mlxreg_core_item *item;
+	struct mlxreg_core_data *data;
+	int num_attrs = 0, id = 0, i, j;
+
+	pdata = dev_get_platdata(&priv->pdev->dev);
+	item = pdata->items;
+
+	/* Go over all kinds of items - psu, pwr, fan. */
+	for (i = 0; i < pdata->counter; i++, item++) {
+		num_attrs += item->count;
+		data = item->data;
+		/* Go over all units within the item. */
+		for (j = 0; j < item->count; j++, data++, id++) {
+			PRIV_ATTR(id) = &PRIV_DEV_ATTR(id).dev_attr.attr;
+			PRIV_ATTR(id)->name = devm_kasprintf(&priv->pdev->dev,
+							     GFP_KERNEL,
+							     data->label);
+
+			if (!PRIV_ATTR(id)->name) {
+				dev_err(priv->dev, "Memory allocation failed for attr %d.\n",
+					id);
+				return -ENOMEM;
+			}
+
+			PRIV_DEV_ATTR(id).dev_attr.attr.name =
+							PRIV_ATTR(id)->name;
+			PRIV_DEV_ATTR(id).dev_attr.attr.mode = 0444;
+			PRIV_DEV_ATTR(id).dev_attr.show =
+						mlxreg_hotplug_attr_show;
+			PRIV_DEV_ATTR(id).nr = i;
+			PRIV_DEV_ATTR(id).index = j;
+			sysfs_attr_init(&PRIV_DEV_ATTR(id).dev_attr.attr);
+		}
+	}
+
+	priv->group.attrs = devm_kcalloc(&priv->pdev->dev,
+					 num_attrs,
+					 sizeof(struct attribute *),
+					 GFP_KERNEL);
+	if (!priv->group.attrs)
+		return -ENOMEM;
+
+	priv->group.attrs = priv->mlxreg_hotplug_attr;
+	priv->groups[0] = &priv->group;
+	priv->groups[1] = NULL;
+
+	return 0;
+}
+
+static void
+mlxreg_hotplug_work_helper(struct mlxreg_hotplug_priv_data *priv,
+			   struct mlxreg_core_item *item)
+{
+	struct mlxreg_core_data *data;
+	unsigned long asserted;
+	u32 regval, bit;
+	int ret;
+
+	/*
+	 * Validate if item related to received signal type is valid.
+	 * It should never happen, excepted the situation when some
+	 * piece of hardware is broken. In such situation just produce
+	 * error message and return. Caller must continue to handle the
+	 * signals from other devices if any.
+	 */
+	if (unlikely(!item)) {
+		dev_err(priv->dev, "False signal: at offset:mask 0x%02x:0x%02x.\n",
+			item->reg, item->mask);
+
+		return;
+	}
+
+	/* Mask event. */
+	ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_MASK_OFF,
+			   0);
+	if (ret)
+		goto out;
+
+	/* Read status. */
+	ret = regmap_read(priv->regmap, item->reg, &regval);
+	if (ret)
+		goto out;
+
+	/* Set asserted bits and save last status. */
+	regval &= item->mask;
+	asserted = item->cache ^ regval;
+	item->cache = regval;
+
+	for_each_set_bit(bit, &asserted, 8) {
+		data = item->data + bit;
+		if (regval & BIT(bit)) {
+			if (item->inversed)
+				mlxreg_hotplug_device_destroy(priv, data);
+			else
+				mlxreg_hotplug_device_create(priv, data);
+		} else {
+			if (item->inversed)
+				mlxreg_hotplug_device_create(priv, data);
+			else
+				mlxreg_hotplug_device_destroy(priv, data);
+		}
+	}
+
+	/* Acknowledge event. */
+	ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_EVENT_OFF,
+			   0);
+	if (ret)
+		goto out;
+
+	/* Unmask event. */
+	ret = regmap_write(priv->regmap, item->reg + MLXREG_HOTPLUG_MASK_OFF,
+			   item->mask);
+
+ out:
+	if (ret)
+		dev_err(priv->dev, "Failed to complete workqueue.\n");
+}
+
+static void
+mlxreg_hotplug_health_work_helper(struct mlxreg_hotplug_priv_data *priv,
+				  struct mlxreg_core_item *item)
+{
+	struct mlxreg_core_data *data = item->data;
+	u32 regval;
+	int i, ret = 0;
+
+	for (i = 0; i < item->count; i++, data++) {
+		/* Mask event. */
+		ret = regmap_write(priv->regmap, data->reg +
+				   MLXREG_HOTPLUG_MASK_OFF, 0);
+		if (ret)
+			goto out;
+
+		/* Read status. */
+		ret = regmap_read(priv->regmap, data->reg, &regval);
+		if (ret)
+			goto out;
+
+		regval &= data->mask;
+
+		if (item->cache == regval)
+			goto ack_event;
+
+		/*
+		 * ASIC health indication is provided through two bits. Bits
+		 * value 0x2 indicates that ASIC reached the good health, value
+		 * 0x0 indicates ASIC the bad health or dormant state and value
+		 * 0x3 indicates the booting state. During ASIC reset it should
+		 * pass the following states: dormant -> booting -> good.
+		 */
+		if (regval == MLXREG_HOTPLUG_GOOD_HEALTH_MASK) {
+			if (!data->attached) {
+				/*
+				 * ASIC is in steady state. Connect associated
+				 * device, if configured.
+				 */
+				mlxreg_hotplug_device_create(priv, data);
+				data->attached = true;
+			}
+		} else {
+			if (data->attached) {
+				/*
+				 * ASIC health is failed after ASIC has been
+				 * in steady state. Disconnect associated
+				 * device, if it has been connected.
+				 */
+				mlxreg_hotplug_device_destroy(priv, data);
+				data->attached = false;
+				data->health_cntr = 0;
+			}
+		}
+		item->cache = regval;
+ack_event:
+		/* Acknowledge event. */
+		ret = regmap_write(priv->regmap, data->reg +
+				   MLXREG_HOTPLUG_EVENT_OFF, 0);
+		if (ret)
+			goto out;
+
+		/* Unmask event. */
+		ret = regmap_write(priv->regmap, data->reg +
+				   MLXREG_HOTPLUG_MASK_OFF, data->mask);
+		if (ret)
+			goto out;
+	}
+
+ out:
+	if (ret)
+		dev_err(priv->dev, "Failed to complete workqueue.\n");
+}
+
+/*
+ * mlxreg_hotplug_work_handler - performs traversing of device interrupt
+ * registers according to the below hierarchy schema:
+ *
+ *				Aggregation registers (status/mask)
+ * PSU registers:		*---*
+ * *-----------------*		|   |
+ * |status/event/mask|----->    | * |
+ * *-----------------*		|   |
+ * Power registers:		|   |
+ * *-----------------*		|   |
+ * |status/event/mask|----->    | * |
+ * *-----------------*		|   |
+ * FAN registers:		|   |--> CPU
+ * *-----------------*		|   |
+ * |status/event/mask|----->    | * |
+ * *-----------------*		|   |
+ * ASIC registers:		|   |
+ * *-----------------*		|   |
+ * |status/event/mask|----->    | * |
+ * *-----------------*		|   |
+ *				*---*
+ *
+ * In case some system changed are detected: FAN in/out, PSU in/out, power
+ * cable attached/detached, ASIC health good/bad, relevant device is created
+ * or destroyed.
+ */
+static void mlxreg_hotplug_work_handler(struct work_struct *work)
+{
+	struct mlxreg_core_hotplug_platform_data *pdata;
+	struct mlxreg_hotplug_priv_data *priv;
+	struct mlxreg_core_item *item;
+	u32 regval, aggr_asserted;
+	unsigned long flags;
+	int i, ret;
+
+	priv = container_of(work, struct mlxreg_hotplug_priv_data,
+			    dwork_irq.work);
+	pdata = dev_get_platdata(&priv->pdev->dev);
+	item = pdata->items;
+
+	/* Mask aggregation event. */
+	ret = regmap_write(priv->regmap, pdata->cell +
+			   MLXREG_HOTPLUG_AGGR_MASK_OFF, 0);
+	if (ret < 0)
+		goto out;
+
+	/* Read aggregation status. */
+	ret = regmap_read(priv->regmap, pdata->cell, &regval);
+	if (ret)
+		goto out;
+
+	regval &= pdata->mask;
+	aggr_asserted = priv->aggr_cache ^ regval;
+	priv->aggr_cache = regval;
+
+	/*
+	 * Handler is invoked, but no assertion is detected at top aggregation
+	 * status level. Set aggr_asserted to mask value to allow handler extra
+	 * run over all relevant signals to recover any missed signal.
+	 */
+	if (priv->not_asserted == MLXREG_HOTPLUG_NOT_ASSERT) {
+		priv->not_asserted = 0;
+		aggr_asserted = pdata->mask;
+	}
+	if (!aggr_asserted)
+		goto unmask_event;
+
+	/* Handle topology and health configuration changes. */
+	for (i = 0; i < pdata->counter; i++, item++) {
+		if (aggr_asserted & item->aggr_mask) {
+			if (item->health)
+				mlxreg_hotplug_health_work_helper(priv, item);
+			else
+				mlxreg_hotplug_work_helper(priv, item);
+		}
+	}
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	/*
+	 * It is possible, that some signals have been inserted, while
+	 * interrupt has been masked by mlxreg_hotplug_work_handler. In this
+	 * case such signals will be missed. In order to handle these signals
+	 * delayed work is canceled and work task re-scheduled for immediate
+	 * execution. It allows to handle missed signals, if any. In other case
+	 * work handler just validates that no new signals have been received
+	 * during masking.
+	 */
+	cancel_delayed_work(&priv->dwork_irq);
+	schedule_delayed_work(&priv->dwork_irq, 0);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return;
+
+unmask_event:
+	priv->not_asserted++;
+	/* Unmask aggregation event (no need acknowledge). */
+	ret = regmap_write(priv->regmap, pdata->cell +
+			   MLXREG_HOTPLUG_AGGR_MASK_OFF, pdata->mask);
+
+ out:
+	if (ret)
+		dev_err(priv->dev, "Failed to complete workqueue.\n");
+}
+
+static int mlxreg_hotplug_set_irq(struct mlxreg_hotplug_priv_data *priv)
+{
+	struct mlxreg_core_hotplug_platform_data *pdata;
+	struct mlxreg_core_item *item;
+	int i, ret;
+
+	pdata = dev_get_platdata(&priv->pdev->dev);
+	item = pdata->items;
+
+	for (i = 0; i < pdata->counter; i++, item++) {
+		/* Clear group presense event. */
+		ret = regmap_write(priv->regmap, item->reg +
+				   MLXREG_HOTPLUG_EVENT_OFF, 0);
+		if (ret)
+			goto out;
+
+		/* Set group initial status as mask and unmask group event. */
+		if (item->inversed) {
+			item->cache = item->mask;
+			ret = regmap_write(priv->regmap, item->reg +
+					   MLXREG_HOTPLUG_MASK_OFF,
+					   item->mask);
+			if (ret)
+				goto out;
+		}
+	}
+
+	/* Keep aggregation initial status as zero and unmask events. */
+	ret = regmap_write(priv->regmap, pdata->cell +
+			   MLXREG_HOTPLUG_AGGR_MASK_OFF, pdata->mask);
+	if (ret)
+		goto out;
+
+	/* Keep low aggregation initial status as zero and unmask events. */
+	if (pdata->cell_low) {
+		ret = regmap_write(priv->regmap, pdata->cell_low +
+				   MLXREG_HOTPLUG_AGGR_MASK_OFF,
+				   pdata->mask_low);
+		if (ret)
+			goto out;
+	}
+
+	/* Invoke work handler for initializing hot plug devices setting. */
+	mlxreg_hotplug_work_handler(&priv->dwork_irq.work);
+
+ out:
+	if (ret)
+		dev_err(priv->dev, "Failed to set interrupts.\n");
+	enable_irq(priv->irq);
+	return ret;
+}
+
+static void mlxreg_hotplug_unset_irq(struct mlxreg_hotplug_priv_data *priv)
+{
+	struct mlxreg_core_hotplug_platform_data *pdata;
+	struct mlxreg_core_item *item;
+	struct mlxreg_core_data *data;
+	int count, i, j;
+
+	pdata = dev_get_platdata(&priv->pdev->dev);
+	item = pdata->items;
+	disable_irq(priv->irq);
+	cancel_delayed_work_sync(&priv->dwork_irq);
+
+	/* Mask low aggregation event, if defined. */
+	if (pdata->cell_low)
+		regmap_write(priv->regmap, pdata->cell_low +
+			     MLXREG_HOTPLUG_AGGR_MASK_OFF, 0);
+
+	/* Mask aggregation event. */
+	regmap_write(priv->regmap, pdata->cell + MLXREG_HOTPLUG_AGGR_MASK_OFF,
+		     0);
+
+	/* Clear topology configurations. */
+	for (i = 0; i < pdata->counter; i++, item++) {
+		data = item->data;
+		/* Mask group presense event. */
+		regmap_write(priv->regmap, data->reg + MLXREG_HOTPLUG_MASK_OFF,
+			     0);
+		/* Clear group presense event. */
+		regmap_write(priv->regmap, data->reg +
+			     MLXREG_HOTPLUG_EVENT_OFF, 0);
+
+		/* Remove all the attached devices in group. */
+		count = item->count;
+		for (j = 0; j < count; j++, data++)
+			mlxreg_hotplug_device_destroy(priv, data);
+	}
+}
+
+static irqreturn_t mlxreg_hotplug_irq_handler(int irq, void *dev)
+{
+	struct mlxreg_hotplug_priv_data *priv;
+
+	priv = (struct mlxreg_hotplug_priv_data *)dev;
+
+	/* Schedule work task for immediate execution.*/
+	schedule_delayed_work(&priv->dwork_irq, 0);
+
+	return IRQ_HANDLED;
+}
+
+static int mlxreg_hotplug_probe(struct platform_device *pdev)
+{
+	struct mlxreg_core_hotplug_platform_data *pdata;
+	struct mlxreg_hotplug_priv_data *priv;
+	struct i2c_adapter *deferred_adap;
+	int err;
+
+	pdata = dev_get_platdata(&pdev->dev);
+	if (!pdata) {
+		dev_err(&pdev->dev, "Failed to get platform data.\n");
+		return -EINVAL;
+	}
+
+	/* Defer probing if the necessary adapter is not configured yet. */
+	deferred_adap = i2c_get_adapter(pdata->deferred_nr);
+	if (!deferred_adap)
+		return -EPROBE_DEFER;
+	i2c_put_adapter(deferred_adap);
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	if (pdata->irq) {
+		priv->irq = pdata->irq;
+	} else {
+		priv->irq = platform_get_irq(pdev, 0);
+		if (priv->irq < 0) {
+			dev_err(&pdev->dev, "Failed to get platform irq: %d\n",
+				priv->irq);
+			return priv->irq;
+		}
+	}
+
+	priv->regmap = pdata->regmap;
+	priv->dev = pdev->dev.parent;
+	priv->pdev = pdev;
+
+	err = devm_request_irq(&pdev->dev, priv->irq,
+			       mlxreg_hotplug_irq_handler, IRQF_TRIGGER_FALLING
+			       | IRQF_SHARED, "mlxreg-hotplug", priv);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to request irq: %d\n", err);
+		return err;
+	}
+
+	disable_irq(priv->irq);
+	spin_lock_init(&priv->lock);
+	INIT_DELAYED_WORK(&priv->dwork_irq, mlxreg_hotplug_work_handler);
+	dev_set_drvdata(&pdev->dev, priv);
+
+	err = mlxreg_hotplug_attr_init(priv);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to allocate attributes: %d\n",
+			err);
+		return err;
+	}
+
+	priv->hwmon = devm_hwmon_device_register_with_groups(&pdev->dev,
+					"mlxreg_hotplug", priv, priv->groups);
+	if (IS_ERR(priv->hwmon)) {
+		dev_err(&pdev->dev, "Failed to register hwmon device %ld\n",
+			PTR_ERR(priv->hwmon));
+		return PTR_ERR(priv->hwmon);
+	}
+
+	/* Perform initial interrupts setup. */
+	mlxreg_hotplug_set_irq(priv);
+	priv->after_probe = true;
+
+	return 0;
+}
+
+static int mlxreg_hotplug_remove(struct platform_device *pdev)
+{
+	struct mlxreg_hotplug_priv_data *priv = dev_get_drvdata(&pdev->dev);
+
+	/* Clean interrupts setup. */
+	mlxreg_hotplug_unset_irq(priv);
+	devm_free_irq(&pdev->dev, priv->irq, priv);
+
+	return 0;
+}
+
+static struct platform_driver mlxreg_hotplug_driver = {
+	.driver = {
+		.name = "mlxreg-hotplug",
+	},
+	.probe = mlxreg_hotplug_probe,
+	.remove = mlxreg_hotplug_remove,
+};
+
+module_platform_driver(mlxreg_hotplug_driver);
+
+MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
+MODULE_DESCRIPTION("Mellanox regmap hotplug platform driver");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_ALIAS("platform:mlxreg-hotplug");
diff --git a/drivers/platform/mellanox/mlxreg-io.c b/drivers/platform/mellanox/mlxreg-io.c
new file mode 100644
index 000000000..1c3760c13
--- /dev/null
+++ b/drivers/platform/mellanox/mlxreg-io.c
@@ -0,0 +1,245 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Mellanox register access driver
+ *
+ * Copyright (C) 2018 Mellanox Technologies
+ * Copyright (C) 2018 Vadim Pasternak <vadimp@mellanox.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_data/mlxreg.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+/* Attribute parameters. */
+#define MLXREG_IO_ATT_SIZE	10
+#define MLXREG_IO_ATT_NUM	48
+
+/**
+ * struct mlxreg_io_priv_data - driver's private data:
+ *
+ * @pdev: platform device;
+ * @pdata: platform data;
+ * @hwmon: hwmon device;
+ * @mlxreg_io_attr: sysfs attributes array;
+ * @mlxreg_io_dev_attr: sysfs sensor device attribute array;
+ * @group: sysfs attribute group;
+ * @groups: list of sysfs attribute group for hwmon registration;
+ */
+struct mlxreg_io_priv_data {
+	struct platform_device *pdev;
+	struct mlxreg_core_platform_data *pdata;
+	struct device *hwmon;
+	struct attribute *mlxreg_io_attr[MLXREG_IO_ATT_NUM + 1];
+	struct sensor_device_attribute mlxreg_io_dev_attr[MLXREG_IO_ATT_NUM];
+	struct attribute_group group;
+	const struct attribute_group *groups[2];
+};
+
+static int
+mlxreg_io_get_reg(void *regmap, struct mlxreg_core_data *data, u32 in_val,
+		  bool rw_flag, u32 *regval)
+{
+	int ret;
+
+	ret = regmap_read(regmap, data->reg, regval);
+	if (ret)
+		goto access_error;
+
+	/*
+	 * There are three kinds of attributes: single bit, full register's
+	 * bits and bit sequence. For the first kind field mask indicates which
+	 * bits are not related and field bit is set zero. For the second kind
+	 * field mask is set to zero and field bit is set with all bits one.
+	 * No special handling for such kind of attributes - pass value as is.
+	 * For the third kind, field mask indicates which bits are related and
+	 * field bit is set to the first bit number (from 1 to 32) is the bit
+	 * sequence.
+	 */
+	if (!data->bit) {
+		/* Single bit. */
+		if (rw_flag) {
+			/* For show: expose effective bit value as 0 or 1. */
+			*regval = !!(*regval & ~data->mask);
+		} else {
+			/* For store: set effective bit value. */
+			*regval &= data->mask;
+			if (in_val)
+				*regval |= ~data->mask;
+		}
+	} else if (data->mask) {
+		/* Bit sequence. */
+		if (rw_flag) {
+			/* For show: mask and shift right. */
+			*regval = ror32(*regval & data->mask, (data->bit - 1));
+		} else {
+			/* For store: shift to the position and mask. */
+			in_val = rol32(in_val, data->bit - 1) & data->mask;
+			/* Clear relevant bits and set them to new value. */
+			*regval = (*regval & ~data->mask) | in_val;
+		}
+	}
+
+access_error:
+	return ret;
+}
+
+static ssize_t
+mlxreg_io_attr_show(struct device *dev, struct device_attribute *attr,
+		    char *buf)
+{
+	struct mlxreg_io_priv_data *priv = dev_get_drvdata(dev);
+	int index = to_sensor_dev_attr(attr)->index;
+	struct mlxreg_core_data *data = priv->pdata->data + index;
+	u32 regval = 0;
+	int ret;
+
+	ret = mlxreg_io_get_reg(priv->pdata->regmap, data, 0, true, &regval);
+	if (ret)
+		goto access_error;
+
+	return sprintf(buf, "%u\n", regval);
+
+access_error:
+	return ret;
+}
+
+static ssize_t
+mlxreg_io_attr_store(struct device *dev, struct device_attribute *attr,
+		     const char *buf, size_t len)
+{
+	struct mlxreg_io_priv_data *priv = dev_get_drvdata(dev);
+	int index = to_sensor_dev_attr(attr)->index;
+	struct mlxreg_core_data *data = priv->pdata->data + index;
+	u32 input_val, regval;
+	int ret;
+
+	if (len > MLXREG_IO_ATT_SIZE)
+		return -EINVAL;
+
+	/* Convert buffer to input value. */
+	ret = kstrtou32(buf, 0, &input_val);
+	if (ret)
+		return ret;
+
+	ret = mlxreg_io_get_reg(priv->pdata->regmap, data, input_val, false,
+				&regval);
+	if (ret)
+		goto access_error;
+
+	ret = regmap_write(priv->pdata->regmap, data->reg, regval);
+	if (ret)
+		goto access_error;
+
+	return len;
+
+access_error:
+	dev_err(&priv->pdev->dev, "Bus access error\n");
+	return ret;
+}
+
+static struct device_attribute mlxreg_io_devattr_rw = {
+	.show	= mlxreg_io_attr_show,
+	.store	= mlxreg_io_attr_store,
+};
+
+static int mlxreg_io_attr_init(struct mlxreg_io_priv_data *priv)
+{
+	int i;
+
+	priv->group.attrs = devm_kcalloc(&priv->pdev->dev,
+					 priv->pdata->counter,
+					 sizeof(struct attribute *),
+					 GFP_KERNEL);
+	if (!priv->group.attrs)
+		return -ENOMEM;
+
+	for (i = 0; i < priv->pdata->counter; i++) {
+		priv->mlxreg_io_attr[i] =
+				&priv->mlxreg_io_dev_attr[i].dev_attr.attr;
+		memcpy(&priv->mlxreg_io_dev_attr[i].dev_attr,
+		       &mlxreg_io_devattr_rw, sizeof(struct device_attribute));
+
+		/* Set attribute name as a label. */
+		priv->mlxreg_io_attr[i]->name =
+				devm_kasprintf(&priv->pdev->dev, GFP_KERNEL,
+					       priv->pdata->data[i].label);
+
+		if (!priv->mlxreg_io_attr[i]->name) {
+			dev_err(&priv->pdev->dev, "Memory allocation failed for sysfs attribute %d.\n",
+				i + 1);
+			return -ENOMEM;
+		}
+
+		priv->mlxreg_io_dev_attr[i].dev_attr.attr.mode =
+						priv->pdata->data[i].mode;
+		priv->mlxreg_io_dev_attr[i].dev_attr.attr.name =
+					priv->mlxreg_io_attr[i]->name;
+		priv->mlxreg_io_dev_attr[i].index = i;
+		sysfs_attr_init(&priv->mlxreg_io_dev_attr[i].dev_attr.attr);
+	}
+
+	priv->group.attrs = priv->mlxreg_io_attr;
+	priv->groups[0] = &priv->group;
+	priv->groups[1] = NULL;
+
+	return 0;
+}
+
+static int mlxreg_io_probe(struct platform_device *pdev)
+{
+	struct mlxreg_io_priv_data *priv;
+	int err;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->pdata = dev_get_platdata(&pdev->dev);
+	if (!priv->pdata) {
+		dev_err(&pdev->dev, "Failed to get platform data.\n");
+		return -EINVAL;
+	}
+
+	priv->pdev = pdev;
+
+	err = mlxreg_io_attr_init(priv);
+	if (err) {
+		dev_err(&priv->pdev->dev, "Failed to allocate attributes: %d\n",
+			err);
+		return err;
+	}
+
+	priv->hwmon = devm_hwmon_device_register_with_groups(&pdev->dev,
+							     "mlxreg_io",
+							      priv,
+							      priv->groups);
+	if (IS_ERR(priv->hwmon)) {
+		dev_err(&pdev->dev, "Failed to register hwmon device %ld\n",
+			PTR_ERR(priv->hwmon));
+		return PTR_ERR(priv->hwmon);
+	}
+
+	dev_set_drvdata(&pdev->dev, priv);
+
+	return 0;
+}
+
+static struct platform_driver mlxreg_io_driver = {
+	.driver = {
+	    .name = "mlxreg-io",
+	},
+	.probe = mlxreg_io_probe,
+};
+
+module_platform_driver(mlxreg_io_driver);
+
+MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
+MODULE_DESCRIPTION("Mellanox regmap I/O access driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mlxreg-io");