driver:mailbox: add mailbox driver

add mailbox driver

Signed-off-by: shanlong.li <shanlong.li@starfivetech.com>

[hoegeun.kwon: cherry-pick the commit a070a8d2467d from https://github.com/starfive-tech/linux/tree/JH7110_VisionFive2_6.1.y_devel]
Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>

Change-Id: Iedb770bbdc8ec148c1b7eebf48df3b0e273063f6

4 files changed, 771 insertions, 0 deletions

diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index 05d6fae800e3..e272ece9a335 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -294,4 +294,17 @@ config QCOM_IPCC
 	  acts as an interrupt controller for receiving interrupts from clients.
 	  Say Y here if you want to build this driver.
 
+config STARFIVE_MBOX
+	tristate "Platform Starfive Mailbox"
+	depends on OF
+	help
+	  Say Y here if you want to build a platform specific variant RISCV
+	  controller driver.
+
+config STARFIVE_MBOX_TEST
+	tristate "Starfive Mailbox Test Client"
+	depends on OF
+	depends on HAS_IOMEM
+	help
+	  Test client to help with testing new Controller driver implementations.
 endif
diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
index fc9376117111..f5ff98ba44c9 100644
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -62,3 +62,7 @@ obj-$(CONFIG_SPRD_MBOX)		+= sprd-mailbox.o
 obj-$(CONFIG_QCOM_IPCC)		+= qcom-ipcc.o
 
 obj-$(CONFIG_APPLE_MAILBOX)	+= apple-mailbox.o
+
+obj-$(CONFIG_STARFIVE_MBOX)    += starfive_mailbox.o
+
+obj-$(CONFIG_STARFIVE_MBOX_TEST)    += starfive_mailbox-test.o
diff --git a/drivers/mailbox/starfive_mailbox-test.c b/drivers/mailbox/starfive_mailbox-test.c
new file mode 100644
index 000000000000..4da866445630
--- /dev/null
+++ b/drivers/mailbox/starfive_mailbox-test.c
@@ -0,0 +1,407 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2015 ST Microelectronics
+ *
+ * Author: Lee Jones <lee.jones@linaro.org>
+ */
+
+#include <linux/debugfs.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mailbox_client.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/sched/signal.h>
+
+#include <linux/mailbox_controller.h>
+
+#define MBOX_MAX_SIG_LEN	8
+#define MBOX_MAX_MSG_LEN	16
+#define MBOX_BYTES_PER_LINE	16
+#define MBOX_HEXDUMP_LINE_LEN	((MBOX_BYTES_PER_LINE * 4) + 2)
+#define MBOX_HEXDUMP_MAX_LEN	(MBOX_HEXDUMP_LINE_LEN * (MBOX_MAX_MSG_LEN / MBOX_BYTES_PER_LINE))
+
+static bool mbox_data_ready;
+
+struct mbox_test_device {
+	struct device		*dev;
+	void __iomem		*tx_mmio;
+	void __iomem		*rx_mmio;
+	struct mbox_chan	*tx_channel;
+	struct mbox_chan	*rx_channel;
+	char			*rx_buffer;
+	char			*signal;
+	char			*message;
+	spinlock_t		lock;
+	wait_queue_head_t	waitq;
+	struct fasync_struct	*async_queue;
+	struct dentry		*root_debugfs_dir;
+};
+
+static ssize_t mbox_test_signal_write(struct file *filp,
+		const char __user *userbuf,
+		size_t count, loff_t *ppos)
+{
+	struct mbox_test_device *tdev = filp->private_data;
+
+	if (!tdev->tx_channel) {
+		dev_err(tdev->dev, "Channel cannot do Tx\n");
+		return -EINVAL;
+	}
+
+	if (count > MBOX_MAX_SIG_LEN) {
+		dev_err(tdev->dev,
+			"Signal length %zd greater than max allowed %d\n",
+			count, MBOX_MAX_SIG_LEN);
+		return -EINVAL;
+	}
+
+	/* Only allocate memory if we need to */
+	if (!tdev->signal) {
+		tdev->signal = kzalloc(MBOX_MAX_SIG_LEN, GFP_KERNEL);
+		if (!tdev->signal)
+			return -ENOMEM;
+	}
+
+	if (copy_from_user(tdev->signal, userbuf, count)) {
+		kfree(tdev->signal);
+		tdev->signal = NULL;
+		return -EFAULT;
+	}
+
+	return count;
+}
+
+static const struct file_operations mbox_test_signal_ops = {
+	.write = mbox_test_signal_write,
+	.open = simple_open,
+	.llseek = generic_file_llseek,
+};
+
+static int mbox_test_message_fasync(int fd, struct file *filp, int on)
+{
+	struct mbox_test_device *tdev = filp->private_data;
+
+	return fasync_helper(fd, filp, on, &tdev->async_queue);
+}
+
+static ssize_t mbox_test_message_write(struct file *filp,
+		const char __user *userbuf,
+		size_t count, loff_t *ppos)
+{
+	struct mbox_test_device *tdev = filp->private_data;
+	void *data;
+	int ret;
+
+	if (!tdev->tx_channel) {
+		dev_err(tdev->dev, "Channel cannot do Tx\n");
+		return -EINVAL;
+	}
+
+	if (count > MBOX_MAX_MSG_LEN) {
+		dev_err(tdev->dev,
+			"Message length %zd greater than max allowed %d\n",
+			count, MBOX_MAX_MSG_LEN);
+		return -EINVAL;
+	}
+
+	tdev->message = kzalloc(MBOX_MAX_MSG_LEN, GFP_KERNEL);
+	if (!tdev->message)
+		return -ENOMEM;
+
+	ret = copy_from_user(tdev->message, userbuf, count);
+	if (ret) {
+		ret = -EFAULT;
+		goto out;
+	}
+
+	if (tdev->tx_mmio && tdev->signal) {
+		print_hex_dump_bytes("Client: Sending: Signal: ", DUMP_PREFIX_ADDRESS,
+			tdev->signal, MBOX_MAX_SIG_LEN);
+
+		data = tdev->signal;
+	} else
+		data = tdev->message;
+
+	print_hex_dump_bytes("Client: Sending: Message: ", DUMP_PREFIX_ADDRESS,
+		tdev->message, MBOX_MAX_MSG_LEN);
+
+	ret = mbox_send_message(tdev->tx_channel, data);
+	mbox_chan_txdone(tdev->tx_channel, ret);
+	if (ret < 0)
+		dev_err(tdev->dev, "Failed to send message via mailbox\n");
+
+out:
+	kfree(tdev->signal);
+	kfree(tdev->message);
+	tdev->signal = NULL;
+
+	return ret < 0 ? ret : count;
+}
+
+static bool mbox_test_message_data_ready(struct mbox_test_device *tdev)
+{
+	bool data_ready;
+	unsigned long flags;
+
+	spin_lock_irqsave(&tdev->lock, flags);
+	data_ready = mbox_data_ready;
+	spin_unlock_irqrestore(&tdev->lock, flags);
+
+	return data_ready;
+}
+
+static ssize_t mbox_test_message_read(struct file *filp, char __user *userbuf,
+		size_t count, loff_t *ppos)
+{
+	struct mbox_test_device *tdev = filp->private_data;
+	unsigned long flags;
+	char *touser, *ptr;
+	int ret;
+
+	touser = kzalloc(MBOX_HEXDUMP_MAX_LEN + 1, GFP_KERNEL);
+	if (!touser)
+		return -ENOMEM;
+
+	if (!tdev->rx_channel) {
+		ret = snprintf(touser, 20, "<NO RX CAPABILITY>\n");
+		ret = simple_read_from_buffer(userbuf, count, ppos,
+			touser, ret);
+		goto kfree_err;
+	}
+
+	do {
+		if (mbox_test_message_data_ready(tdev))
+			break;
+
+		if (filp->f_flags & O_NONBLOCK) {
+			ret = -EAGAIN;
+			goto waitq_err;
+		}
+
+		if (signal_pending(current)) {
+			ret = -ERESTARTSYS;
+			goto waitq_err;
+		}
+		schedule();
+
+	} while (1);
+
+	spin_lock_irqsave(&tdev->lock, flags);
+
+	ptr = tdev->rx_buffer;
+
+	mbox_data_ready = false;
+
+	spin_unlock_irqrestore(&tdev->lock, flags);
+	if (copy_to_user((void __user *)userbuf, ptr, 4))
+		ret = -EFAULT;
+
+waitq_err:
+	__set_current_state(TASK_RUNNING);
+kfree_err:
+	kfree(touser);
+	return ret;
+}
+
+static __poll_t
+mbox_test_message_poll(struct file *filp, struct poll_table_struct *wait)
+{
+	struct mbox_test_device *tdev = filp->private_data;
+
+	poll_wait(filp, &tdev->waitq, wait);
+
+	if (mbox_test_message_data_ready(tdev))
+		return EPOLLIN | EPOLLRDNORM;
+	return 0;
+}
+
+static const struct file_operations mbox_test_message_ops = {
+	.write = mbox_test_message_write,
+	.read = mbox_test_message_read,
+	.fasync = mbox_test_message_fasync,
+	.poll = mbox_test_message_poll,
+	.open = simple_open,
+	.llseek = generic_file_llseek,
+};
+
+static int mbox_test_add_debugfs(struct platform_device *pdev,
+		struct mbox_test_device *tdev)
+{
+	if (!debugfs_initialized())
+		return 0;
+
+	tdev->root_debugfs_dir = debugfs_create_dir(dev_name(&pdev->dev), NULL);
+	if (!tdev->root_debugfs_dir) {
+		dev_err(&pdev->dev, "Failed to create Mailbox debugfs\n");
+		return -EINVAL;
+	}
+
+	debugfs_create_file("message", 0600, tdev->root_debugfs_dir,
+		tdev, &mbox_test_message_ops);
+
+	debugfs_create_file("signal", 0200, tdev->root_debugfs_dir,
+		tdev, &mbox_test_signal_ops);
+
+	return 0;
+}
+
+static void mbox_test_receive_message(struct mbox_client *client, void *message)
+{
+	struct mbox_test_device *tdev = dev_get_drvdata(client->dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&tdev->lock, flags);
+	if (tdev->rx_mmio) {
+		memcpy_fromio(tdev->rx_buffer, tdev->rx_mmio, MBOX_MAX_MSG_LEN);
+		print_hex_dump_bytes("Client: Received [MMIO]: ", DUMP_PREFIX_ADDRESS,
+			tdev->rx_buffer, MBOX_MAX_MSG_LEN);
+	} else if (message) {
+		print_hex_dump_bytes("Client: Received [API]: ", DUMP_PREFIX_ADDRESS,
+			message, MBOX_MAX_MSG_LEN);
+		memcpy(tdev->rx_buffer, message, MBOX_MAX_MSG_LEN);
+	}
+	mbox_data_ready = true;
+	spin_unlock_irqrestore(&tdev->lock, flags);
+}
+
+static void mbox_test_prepare_message(struct mbox_client *client, void *message)
+{
+	struct mbox_test_device *tdev = dev_get_drvdata(client->dev);
+
+	if (tdev->tx_mmio) {
+		if (tdev->signal)
+			memcpy_toio(tdev->tx_mmio, tdev->message, MBOX_MAX_MSG_LEN);
+		else
+			memcpy_toio(tdev->tx_mmio, message, MBOX_MAX_MSG_LEN);
+	}
+}
+
+static struct mbox_chan *
+mbox_test_request_channel(struct platform_device *pdev, const char *name)
+{
+	struct mbox_client *client;
+	struct mbox_chan *channel;
+
+	client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL);
+	if (!client)
+		return ERR_PTR(-ENOMEM);
+
+	client->dev        = &pdev->dev;
+	client->rx_callback    = mbox_test_receive_message;
+	client->tx_prepare    = mbox_test_prepare_message;
+	client->tx_block    = false;
+	client->knows_txdone    = false;
+	client->tx_tout        = 500;
+
+	channel = mbox_request_channel_byname(client, name);
+	if (IS_ERR(channel)) {
+		dev_warn(&pdev->dev, "Failed to request %s channel\n", name);
+		return NULL;
+	}
+
+	return channel;
+}
+
+static int mbox_test_probe(struct platform_device *pdev)
+{
+	struct mbox_test_device *tdev;
+	struct resource *res;
+	resource_size_t size;
+	int ret;
+
+	tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL);
+	if (!tdev)
+		return -ENOMEM;
+
+	/* It's okay for MMIO to be NULL */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	tdev->tx_mmio = devm_ioremap_resource(&pdev->dev, res);
+	if (PTR_ERR(tdev->tx_mmio) == -EBUSY) {
+		/* if reserved area in SRAM, try just ioremap */
+		size = resource_size(res);
+		tdev->tx_mmio = devm_ioremap(&pdev->dev, res->start, size);
+	} else if (IS_ERR(tdev->tx_mmio)) {
+		tdev->tx_mmio = NULL;
+	}
+
+	/* If specified, second reg entry is Rx MMIO */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	tdev->rx_mmio = devm_ioremap_resource(&pdev->dev, res);
+	if (PTR_ERR(tdev->rx_mmio) == -EBUSY) {
+		size = resource_size(res);
+		tdev->rx_mmio = devm_ioremap(&pdev->dev, res->start, size);
+	} else if (IS_ERR(tdev->rx_mmio)) {
+		tdev->rx_mmio = tdev->tx_mmio;
+	}
+
+	tdev->tx_channel = mbox_test_request_channel(pdev, "tx");
+	tdev->rx_channel = mbox_test_request_channel(pdev, "rx");
+
+	if (!tdev->tx_channel && !tdev->rx_channel)
+		return -EPROBE_DEFER;
+
+	/* If Rx is not specified but has Rx MMIO, then Rx = Tx */
+	if (!tdev->rx_channel && (tdev->rx_mmio != tdev->tx_mmio))
+		tdev->rx_channel = tdev->tx_channel;
+
+	tdev->dev = &pdev->dev;
+	platform_set_drvdata(pdev, tdev);
+
+	spin_lock_init(&tdev->lock);
+
+	if (tdev->rx_channel) {
+		tdev->rx_buffer = devm_kzalloc(&pdev->dev,
+			MBOX_MAX_MSG_LEN, GFP_KERNEL);
+		if (!tdev->rx_buffer)
+			return -ENOMEM;
+	}
+
+	ret = mbox_test_add_debugfs(pdev, tdev);
+	if (ret)
+		return ret;
+
+	dev_info(&pdev->dev, "Successfully registered\n");
+
+	return 0;
+}
+
+static int mbox_test_remove(struct platform_device *pdev)
+{
+	struct mbox_test_device *tdev = platform_get_drvdata(pdev);
+
+	debugfs_remove_recursive(tdev->root_debugfs_dir);
+
+	if (tdev->tx_channel)
+		mbox_free_channel(tdev->tx_channel);
+	if (tdev->rx_channel)
+		mbox_free_channel(tdev->rx_channel);
+
+	return 0;
+}
+
+static const struct of_device_id mbox_test_match[] = {
+	{ .compatible = "starfive,mailbox-test" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mbox_test_match);
+
+static struct platform_driver mbox_test_driver = {
+	.driver = {
+		.name = "mailbox_test",
+		.of_match_table = mbox_test_match,
+	},
+	.probe  = mbox_test_probe,
+	.remove = mbox_test_remove,
+};
+module_platform_driver(mbox_test_driver);
+
+MODULE_DESCRIPTION("Generic Mailbox Testing Facility");
+MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/mailbox/starfive_mailbox.c b/drivers/mailbox/starfive_mailbox.c
new file mode 100644
index 000000000000..977514a7c154
--- /dev/null
+++ b/drivers/mailbox/starfive_mailbox.c
@@ -0,0 +1,347 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * mailbox driver for StarFive JH7110 SoC
+ *
+ * Copyright (c) 2021 StarFive Technology Co., Ltd.
+ * Author: Shanlong Li <shanlong.li@starfivetech.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/mailbox_controller.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <linux/pm_runtime.h>
+
+#include "mailbox.h"
+
+#define MBOX_CHAN_MAX		4
+
+#define MBOX_BASE(mbox, ch)	((mbox)->base + ((ch) * 0x10))
+#define MBOX_IRQ_REG		0x00
+#define MBOX_SET_REG		0x04
+#define MBOX_CLR_REG		0x08
+#define MBOX_CMD_REG		0x0c
+#define MBC_PEND_SMRY		0x100
+
+typedef enum {
+	MAILBOX_CORE_U7 = 0,
+	MAILBOX_CORE_HIFI4,
+	MAILBOX_CORE_E2,
+	MAILBOX_CORE_RSVD0,
+	MAILBOX_CORE_NUM,
+} mailbox_core_t;
+
+struct mailbox_irq_name_c{
+	int id;
+	char name[16];
+};
+
+static const struct mailbox_irq_name_c irq_peer_name[MBOX_CHAN_MAX] = {
+	{MAILBOX_CORE_U7,    "u74_core"},
+	{MAILBOX_CORE_HIFI4, "hifi4_core"},
+	{MAILBOX_CORE_E2,    "e24_core"},
+	{MAILBOX_CORE_RSVD0, "" },
+};
+
+/**
+ * starfive mailbox channel information
+ *
+ * A channel can be used for TX or RX, it can trigger remote
+ * processor interrupt to notify remote processor and can receive
+ * interrupt if has incoming message.
+ *
+ * @dst_irq:    Interrupt vector for remote processor
+ * @core_id:    id for remote processor
+ */
+struct starfive_chan_info {
+	unsigned int dst_irq;
+	mailbox_core_t core_id;
+};
+
+/**
+ * starfive mailbox controller data
+ *
+ * Mailbox controller includes 4 channels and can allocate
+ * channel for message transferring.
+ *
+ * @dev:    Device to which it is attached
+ * @base:    Base address of the register mapping region
+ * @chan:    Representation of channels in mailbox controller
+ * @mchan:    Representation of channel info
+ * @controller:    Representation of a communication channel controller
+ */
+struct starfive_mbox {
+	struct device *dev;
+	void __iomem *base;
+	struct mbox_chan chan[MBOX_CHAN_MAX];
+	struct starfive_chan_info mchan[MBOX_CHAN_MAX];
+	struct mbox_controller controller;
+	struct clk *clk;
+	struct reset_control *rst_rresetn;
+};
+
+static struct starfive_mbox *to_starfive_mbox(struct mbox_controller *mbox)
+{
+	return container_of(mbox, struct starfive_mbox, controller);
+}
+
+static struct mbox_chan *
+starfive_of_mbox_index_xlate(struct mbox_controller *mbox,
+			const struct of_phandle_args *sp)
+{
+	struct starfive_mbox *sbox;
+
+	int ind = sp->args[0];
+	int core_id = sp->args[1];
+
+	if (ind >= mbox->num_chans || core_id >= MAILBOX_CORE_NUM)
+		return ERR_PTR(-EINVAL);
+
+	sbox = to_starfive_mbox(mbox);
+
+	sbox->mchan[ind].core_id = core_id;
+
+	return &mbox->chans[ind];
+}
+
+static irqreturn_t starfive_rx_irq_handler(int irq, void *p)
+{
+	struct mbox_chan *chan = p;
+	unsigned long ch = (unsigned long)chan->con_priv;
+	struct starfive_mbox *mbox = to_starfive_mbox(chan->mbox);
+	void __iomem *base = MBOX_BASE(mbox, ch);
+	u32 val;
+
+	val = readl(base + MBOX_CMD_REG);
+	if (!val)
+		return IRQ_NONE;
+
+	mbox_chan_received_data(chan, (void *)&val);
+	writel(val, base + MBOX_CLR_REG);
+	return IRQ_HANDLED;
+}
+
+static int starfive_mbox_check_state(struct mbox_chan *chan)
+{
+	unsigned long ch = (unsigned long)chan->con_priv;
+	struct starfive_mbox *mbox = to_starfive_mbox(chan->mbox);
+	unsigned long irq_flag = IRQF_SHARED;
+	long ret = 0;
+
+	pm_runtime_get_sync(mbox->dev);
+	/* MAILBOX should be with IRQF_NO_SUSPEND set */
+	if (!mbox->dev->pm_domain)
+		irq_flag |= IRQF_NO_SUSPEND;
+
+	/* Mailbox is idle so directly bail out */
+	if (readl(mbox->base + MBC_PEND_SMRY) & BIT(ch))
+		return -EBUSY;
+
+	if (mbox->mchan[ch].dst_irq > 0) {
+		dev_dbg(mbox->dev, "%s: host IRQ = %d, ch:%ld", __func__, mbox->mchan[ch].dst_irq, ch);
+		ret = devm_request_irq(mbox->dev, mbox->mchan[ch].dst_irq, starfive_rx_irq_handler,
+			irq_flag, irq_peer_name[ch].name, chan);
+		if (ret < 0)
+			dev_err(mbox->dev, "request_irq %d failed\n", mbox->mchan[ch].dst_irq);
+	}
+
+	return ret;
+}
+
+static int starfive_mbox_startup(struct mbox_chan *chan)
+{
+	return starfive_mbox_check_state(chan);
+}
+
+static void starfive_mbox_shutdown(struct mbox_chan *chan)
+{
+	struct starfive_mbox *mbox = to_starfive_mbox(chan->mbox);
+	unsigned long ch = (unsigned long)chan->con_priv;
+	void __iomem *base = MBOX_BASE(mbox, ch);
+
+	writel(0x0, base + MBOX_IRQ_REG);
+	writel(0x0, base + MBOX_CLR_REG);
+
+	if (mbox->mchan[ch].dst_irq > 0)
+		devm_free_irq(mbox->dev, mbox->mchan[ch].dst_irq, chan);
+	pm_runtime_put_sync(mbox->dev);
+}
+
+static int starfive_mbox_send_data(struct mbox_chan *chan, void *msg)
+{
+	unsigned long ch = (unsigned long)chan->con_priv;
+	struct starfive_mbox *mbox = to_starfive_mbox(chan->mbox);
+	struct starfive_chan_info *mchan = &mbox->mchan[ch];
+	void __iomem *base = MBOX_BASE(mbox, ch);
+	u32 *buf = msg;
+
+	/* Ensure channel is released */
+	if (readl(mbox->base + MBC_PEND_SMRY) & BIT(ch)) {
+		pr_debug("%s:%d. busy\n", __func__, __LINE__);
+		return -EBUSY;
+	}
+
+	/* Clear mask for destination interrupt */
+	writel(BIT(mchan->core_id), base + MBOX_IRQ_REG);
+
+	/* Fill message data */
+	writel(*buf, base + MBOX_SET_REG);
+	return 0;
+}
+
+static struct mbox_chan_ops starfive_mbox_ops = {
+	.startup = starfive_mbox_startup,
+	.send_data = starfive_mbox_send_data,
+	.shutdown = starfive_mbox_shutdown,
+};
+
+static const struct of_device_id starfive_mbox_of_match[] = {
+	{ .compatible = "starfive,mail_box",},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, starfive_mbox_of_match);
+
+void starfive_mailbox_init(struct starfive_mbox *mbox)
+{
+	mbox->clk = devm_clk_get_optional(mbox->dev, "clk_apb");
+	if (IS_ERR(mbox->clk)) {
+		dev_err(mbox->dev, "failed to get mailbox\n");
+		return;
+	}
+
+	mbox->rst_rresetn = devm_reset_control_get_exclusive(mbox->dev, "mbx_rre");
+	if (IS_ERR(mbox->rst_rresetn)) {
+		dev_err(mbox->dev, "failed to get mailbox reset\n");
+		return;
+	}
+
+	clk_prepare_enable(mbox->clk);
+	reset_control_deassert(mbox->rst_rresetn);
+}
+
+static int starfive_mbox_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct starfive_mbox *mbox;
+	struct mbox_chan *chan;
+	struct resource *res;
+	unsigned long ch;
+	int err;
+
+	mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);
+	if (!mbox)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mbox->base = devm_ioremap_resource(dev, res);
+	mbox->dev = dev;
+
+	if (IS_ERR(mbox->base))
+		return PTR_ERR(mbox->base);
+
+	starfive_mailbox_init(mbox);
+
+	mbox->controller.dev = dev;
+	mbox->controller.chans = mbox->chan;
+	mbox->controller.num_chans = MBOX_CHAN_MAX;
+	mbox->controller.ops = &starfive_mbox_ops;
+	mbox->controller.of_xlate = starfive_of_mbox_index_xlate;
+	mbox->controller.txdone_irq = true;
+	mbox->controller.txdone_poll = false;
+
+	/* Initialize mailbox channel data */
+	chan = mbox->chan;
+	for (ch = 0; ch < MBOX_CHAN_MAX; ch++) {
+		mbox->mchan[ch].dst_irq = 0;
+		mbox->mchan[ch].core_id = (mailbox_core_t)ch;
+		chan[ch].con_priv = (void *)ch;
+	}
+	mbox->mchan[MAILBOX_CORE_HIFI4].dst_irq = platform_get_irq(pdev, 0);
+	mbox->mchan[MAILBOX_CORE_E2].dst_irq = platform_get_irq(pdev, 1);
+
+	err = mbox_controller_register(&mbox->controller);
+	if (err) {
+		dev_err(dev, "Failed to register mailbox %d\n", err);
+		return err;
+	}
+
+	platform_set_drvdata(pdev, mbox);
+	dev_info(dev, "Mailbox enabled\n");
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	return 0;
+}
+
+static int starfive_mbox_remove(struct platform_device *pdev)
+{
+	struct starfive_mbox *mbox = platform_get_drvdata(pdev);
+
+	mbox_controller_unregister(&mbox->controller);
+	devm_clk_put(mbox->dev, mbox->clk);
+	pm_runtime_disable(mbox->dev);
+
+	return 0;
+}
+
+static int __maybe_unused starfive_mbox_suspend(struct device *dev)
+{
+	struct starfive_mbox *mbox = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(mbox->clk);
+
+	return 0;
+}
+
+static int __maybe_unused starfive_mbox_resume(struct device *dev)
+{
+	struct starfive_mbox *mbox = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_prepare_enable(mbox->clk);
+	if (ret)
+		dev_err(dev, "failed to enable clock\n");
+
+	return ret;
+}
+
+static const struct dev_pm_ops starfive_mbox_pm_ops = {
+	.suspend = starfive_mbox_suspend,
+	.resume = starfive_mbox_resume,
+	SET_RUNTIME_PM_OPS(starfive_mbox_suspend, starfive_mbox_resume, NULL)
+};
+static struct platform_driver starfive_mbox_driver = {
+	.probe  = starfive_mbox_probe,
+	.remove = starfive_mbox_remove,
+	.driver = {
+	.name = "mailbox",
+		.of_match_table = starfive_mbox_of_match,
+		.pm = &starfive_mbox_pm_ops,
+	},
+};
+
+static int __init starfive_mbox_init(void)
+{
+	return platform_driver_register(&starfive_mbox_driver);
+}
+core_initcall(starfive_mbox_init);
+
+static void __exit starfive_mbox_exit(void)
+{
+	platform_driver_unregister(&starfive_mbox_driver);
+}
+module_exit(starfive_mbox_exit);
+
+MODULE_DESCRIPTION("StarFive Mailbox Controller driver");
+MODULE_AUTHOR("Shanlong Li <shanlong.li@starfivetech.com>");
+MODULE_LICENSE("GPL");