Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 639 insertions, 0 deletions

diff --git a/drivers/mailbox/cix-mailbox.c b/drivers/mailbox/cix-mailbox.c
new file mode 100644
index 000000000..7fa979c1b
--- /dev/null
+++ b/drivers/mailbox/cix-mailbox.c
@@ -0,0 +1,639 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2025 Cix Technology Group Co., Ltd.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mailbox_controller.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+/*
+ * The maximum transmission size is 32 words or 128 bytes.
+ */
+#define CIX_MBOX_MSG_WORDS	32	/* Max length = 32 words */
+#define CIX_MBOX_MSG_LEN_MASK	0x7fL	/* Max length = 128 bytes */
+
+/* [0~7] Fast channel
+ * [8] doorbell base channel
+ * [9]fifo base channel
+ * [10] register base channel
+ */
+#define CIX_MBOX_FAST_IDX	7
+#define CIX_MBOX_DB_IDX		8
+#define CIX_MBOX_FIFO_IDX	9
+#define CIX_MBOX_REG_IDX	10
+#define CIX_MBOX_CHANS	11
+
+/* Register define */
+#define CIX_REG_MSG(n)	(0x0 + 0x4*(n))			/* 0x0~0x7c */
+#define CIX_REG_DB_ACK	CIX_REG_MSG(CIX_MBOX_MSG_WORDS)	/* 0x80 */
+#define CIX_ERR_COMP	(CIX_REG_DB_ACK + 0x4)		/* 0x84 */
+#define CIX_ERR_COMP_CLR	(CIX_REG_DB_ACK + 0x8)		/* 0x88 */
+#define CIX_REG_F_INT(IDX)	(CIX_ERR_COMP_CLR + 0x4*(IDX+1))	/* 0x8c~0xa8 */
+#define CIX_FIFO_WR		(CIX_REG_F_INT(CIX_MBOX_FAST_IDX+1))	/* 0xac */
+#define CIX_FIFO_RD		(CIX_FIFO_WR + 0x4)			/* 0xb0 */
+#define CIX_FIFO_STAS	(CIX_FIFO_WR + 0x8)			/* 0xb4 */
+#define CIX_FIFO_WM		(CIX_FIFO_WR + 0xc)			/* 0xb8 */
+#define CIX_INT_ENABLE	(CIX_FIFO_WR + 0x10)		/* 0xbc */
+#define CIX_INT_ENABLE_SIDE_B	(CIX_FIFO_WR + 0x14)	/* 0xc0 */
+#define CIX_INT_CLEAR	(CIX_FIFO_WR + 0x18)		/* 0xc4 */
+#define CIX_INT_STATUS	(CIX_FIFO_WR + 0x1c)		/* 0xc8 */
+#define CIX_FIFO_RST	(CIX_FIFO_WR + 0x20)		/* 0xcc */
+
+#define CIX_MBOX_TX		0
+#define CIX_MBOX_RX		1
+
+#define CIX_DB_INT_BIT	BIT(0)
+#define CIX_DB_ACK_INT_BIT	BIT(1)
+
+#define CIX_FIFO_WM_DEFAULT		CIX_MBOX_MSG_WORDS
+#define CIX_FIFO_STAS_WMK		BIT(0)
+#define CIX_FIFO_STAS_FULL		BIT(1)
+#define CIX_FIFO_STAS_EMPTY		BIT(2)
+#define CIX_FIFO_STAS_UFLOW		BIT(3)
+#define CIX_FIFO_STAS_OFLOW		BIT(4)
+
+#define CIX_FIFO_RST_BIT		BIT(0)
+
+#define CIX_DB_INT			BIT(0)
+#define CIX_ACK_INT			BIT(1)
+#define CIX_FIFO_FULL_INT		BIT(2)
+#define CIX_FIFO_EMPTY_INT		BIT(3)
+#define CIX_FIFO_WM01_INT		BIT(4)
+#define CIX_FIFO_WM10_INT		BIT(5)
+#define CIX_FIFO_OFLOW_INT		BIT(6)
+#define CIX_FIFO_UFLOW_INT		BIT(7)
+#define CIX_FIFO_N_EMPTY_INT	BIT(8)
+#define CIX_FAST_CH_INT(IDX)	BIT((IDX)+9)
+
+#define CIX_SHMEM_OFFSET 0x80
+
+enum cix_mbox_chan_type {
+	CIX_MBOX_TYPE_DB,
+	CIX_MBOX_TYPE_REG,
+	CIX_MBOX_TYPE_FIFO,
+	CIX_MBOX_TYPE_FAST,
+};
+
+struct cix_mbox_con_priv {
+	enum cix_mbox_chan_type type;
+	struct mbox_chan	*chan;
+	int index;
+};
+
+struct cix_mbox_priv {
+	struct device *dev;
+	int irq;
+	int dir;
+	void __iomem *base;	/* region for mailbox */
+	struct cix_mbox_con_priv con_priv[CIX_MBOX_CHANS];
+	struct mbox_chan mbox_chans[CIX_MBOX_CHANS];
+	struct mbox_controller mbox;
+	bool use_shmem;
+};
+
+/*
+ * The CIX mailbox supports four types of transfers:
+ * CIX_MBOX_TYPE_DB, CIX_MBOX_TYPE_FAST, CIX_MBOX_TYPE_REG, and CIX_MBOX_TYPE_FIFO.
+ * For the REG and FIFO types of transfers, the message format is as follows:
+ */
+union cix_mbox_msg_reg_fifo {
+	u32 length;	/* unit is byte */
+	u32 buf[CIX_MBOX_MSG_WORDS]; /* buf[0] must be the byte length of this array */
+};
+
+static struct cix_mbox_priv *to_cix_mbox_priv(struct mbox_controller *mbox)
+{
+	return container_of(mbox, struct cix_mbox_priv, mbox);
+}
+
+static void cix_mbox_write(struct cix_mbox_priv *priv, u32 val, u32 offset)
+{
+	if (priv->use_shmem)
+		iowrite32(val, priv->base + offset - CIX_SHMEM_OFFSET);
+	else
+		iowrite32(val, priv->base + offset);
+}
+
+static u32 cix_mbox_read(struct cix_mbox_priv *priv, u32 offset)
+{
+	if (priv->use_shmem)
+		return ioread32(priv->base + offset - CIX_SHMEM_OFFSET);
+	else
+		return ioread32(priv->base + offset);
+}
+
+static bool mbox_fifo_empty(struct mbox_chan *chan)
+{
+	struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+
+	return ((cix_mbox_read(priv, CIX_FIFO_STAS) & CIX_FIFO_STAS_EMPTY) ? true : false);
+}
+
+/*
+ *The transmission unit of the CIX mailbox is word.
+ *The byte length should be converted into the word length.
+ */
+static inline u32 mbox_get_msg_size(void *msg)
+{
+	u32 len;
+
+	len = ((u32 *)msg)[0] & CIX_MBOX_MSG_LEN_MASK;
+	return DIV_ROUND_UP(len, 4);
+}
+
+static int cix_mbox_send_data_db(struct mbox_chan *chan, void *data)
+{
+	struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+
+	/* trigger doorbell irq */
+	cix_mbox_write(priv, CIX_DB_INT_BIT, CIX_REG_DB_ACK);
+
+	return 0;
+}
+
+static int cix_mbox_send_data_reg(struct mbox_chan *chan, void *data)
+{
+	struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+	union cix_mbox_msg_reg_fifo *msg = data;
+	u32 len, i;
+
+	if (!data)
+		return -EINVAL;
+
+	len = mbox_get_msg_size(data);
+	for (i = 0; i < len; i++)
+		cix_mbox_write(priv, msg->buf[i], CIX_REG_MSG(i));
+
+	/* trigger doorbell irq */
+	cix_mbox_write(priv, CIX_DB_INT_BIT, CIX_REG_DB_ACK);
+
+	return 0;
+}
+
+static int cix_mbox_send_data_fifo(struct mbox_chan *chan, void *data)
+{
+	struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+	union cix_mbox_msg_reg_fifo *msg = data;
+	u32 len, val, i;
+
+	if (!data)
+		return -EINVAL;
+
+	len = mbox_get_msg_size(data);
+	cix_mbox_write(priv, len, CIX_FIFO_WM);
+	for (i = 0; i < len; i++)
+		cix_mbox_write(priv, msg->buf[i], CIX_FIFO_WR);
+
+	/* Enable fifo empty interrupt */
+	val = cix_mbox_read(priv, CIX_INT_ENABLE);
+	val |= CIX_FIFO_EMPTY_INT;
+	cix_mbox_write(priv, val, CIX_INT_ENABLE);
+
+	return 0;
+}
+
+static int cix_mbox_send_data_fast(struct mbox_chan *chan, void *data)
+{
+	struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+	struct cix_mbox_con_priv *cp = chan->con_priv;
+	u32 *arg = (u32 *)data;
+	int index = cp->index;
+
+	if (!data)
+		return -EINVAL;
+
+	if (index < 0 || index > CIX_MBOX_FAST_IDX) {
+		dev_err(priv->dev, "Invalid Mbox index %d\n", index);
+		return -EINVAL;
+	}
+
+	cix_mbox_write(priv, arg[0], CIX_REG_F_INT(index));
+
+	return 0;
+}
+
+static int cix_mbox_send_data(struct mbox_chan *chan, void *data)
+{
+	struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+	struct cix_mbox_con_priv *cp = chan->con_priv;
+
+	if (priv->dir != CIX_MBOX_TX) {
+		dev_err(priv->dev, "Invalid Mbox dir %d\n", priv->dir);
+		return -EINVAL;
+	}
+
+	switch (cp->type) {
+	case CIX_MBOX_TYPE_DB:
+		cix_mbox_send_data_db(chan, data);
+		break;
+	case CIX_MBOX_TYPE_REG:
+		cix_mbox_send_data_reg(chan, data);
+		break;
+	case CIX_MBOX_TYPE_FIFO:
+		cix_mbox_send_data_fifo(chan, data);
+		break;
+	case CIX_MBOX_TYPE_FAST:
+		cix_mbox_send_data_fast(chan, data);
+		break;
+	default:
+		dev_err(priv->dev, "Invalid channel type: %d\n", cp->type);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void cix_mbox_isr_db(struct mbox_chan *chan)
+{
+	struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+	u32 int_status;
+
+	int_status = cix_mbox_read(priv, CIX_INT_STATUS);
+
+	if (priv->dir == CIX_MBOX_RX) {
+		/* rx interrupt is triggered */
+		if (int_status & CIX_DB_INT) {
+			cix_mbox_write(priv, CIX_DB_INT, CIX_INT_CLEAR);
+			mbox_chan_received_data(chan, NULL);
+			/* trigger ack interrupt */
+			cix_mbox_write(priv, CIX_DB_ACK_INT_BIT, CIX_REG_DB_ACK);
+		}
+	} else {
+		/* tx ack interrupt is triggered */
+		if (int_status & CIX_ACK_INT) {
+			cix_mbox_write(priv, CIX_ACK_INT, CIX_INT_CLEAR);
+			mbox_chan_received_data(chan, NULL);
+		}
+	}
+}
+
+static void cix_mbox_isr_reg(struct mbox_chan *chan)
+{
+	struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+	u32 int_status;
+
+	int_status = cix_mbox_read(priv, CIX_INT_STATUS);
+
+	if (priv->dir == CIX_MBOX_RX) {
+		/* rx interrupt is triggered */
+		if (int_status & CIX_DB_INT) {
+			u32 data[CIX_MBOX_MSG_WORDS], len, i;
+
+			cix_mbox_write(priv, CIX_DB_INT, CIX_INT_CLEAR);
+			data[0] = cix_mbox_read(priv, CIX_REG_MSG(0));
+			len = mbox_get_msg_size(data);
+			for (i = 1; i < len; i++)
+				data[i] = cix_mbox_read(priv, CIX_REG_MSG(i));
+
+			/* trigger ack interrupt */
+			cix_mbox_write(priv, CIX_DB_ACK_INT_BIT, CIX_REG_DB_ACK);
+			mbox_chan_received_data(chan, data);
+		}
+	} else {
+		/* tx ack interrupt is triggered */
+		if (int_status & CIX_ACK_INT) {
+			cix_mbox_write(priv, CIX_ACK_INT, CIX_INT_CLEAR);
+			mbox_chan_txdone(chan, 0);
+		}
+	}
+}
+
+static void cix_mbox_isr_fifo(struct mbox_chan *chan)
+{
+	struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+	u32 int_status, status;
+
+	int_status = cix_mbox_read(priv, CIX_INT_STATUS);
+
+	if (priv->dir == CIX_MBOX_RX) {
+		/* FIFO waterMark interrupt is generated */
+		if (int_status & (CIX_FIFO_FULL_INT | CIX_FIFO_WM01_INT)) {
+			u32 data[CIX_MBOX_MSG_WORDS] = { 0 }, i = 0;
+
+			cix_mbox_write(priv, (CIX_FIFO_FULL_INT | CIX_FIFO_WM01_INT),
+						CIX_INT_CLEAR);
+			do {
+				data[i++] = cix_mbox_read(priv, CIX_FIFO_RD);
+			} while (!mbox_fifo_empty(chan) && i < CIX_MBOX_MSG_WORDS);
+
+			mbox_chan_received_data(chan, data);
+		}
+		/* FIFO underflow is generated */
+		if (int_status & CIX_FIFO_UFLOW_INT) {
+			status = cix_mbox_read(priv, CIX_FIFO_STAS);
+			dev_err(priv->dev, "fifo underflow: int_stats %d\n", status);
+			cix_mbox_write(priv, CIX_FIFO_UFLOW_INT, CIX_INT_CLEAR);
+		}
+	} else {
+		/* FIFO empty interrupt is generated */
+		if (int_status & CIX_FIFO_EMPTY_INT) {
+			u32 val;
+
+			cix_mbox_write(priv, CIX_FIFO_EMPTY_INT, CIX_INT_CLEAR);
+			/* Disable empty irq*/
+			val = cix_mbox_read(priv, CIX_INT_ENABLE);
+			val &= ~CIX_FIFO_EMPTY_INT;
+			cix_mbox_write(priv, val, CIX_INT_ENABLE);
+			mbox_chan_txdone(chan, 0);
+		}
+		/* FIFO overflow is generated */
+		if (int_status & CIX_FIFO_OFLOW_INT) {
+			status = cix_mbox_read(priv, CIX_FIFO_STAS);
+			dev_err(priv->dev, "fifo overflow: int_stats %d\n", status);
+			cix_mbox_write(priv, CIX_FIFO_OFLOW_INT, CIX_INT_CLEAR);
+		}
+	}
+}
+
+static void cix_mbox_isr_fast(struct mbox_chan *chan)
+{
+	struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+	struct cix_mbox_con_priv *cp = chan->con_priv;
+	u32 int_status, data;
+
+	/* no irq will be trigger for TX dir mbox */
+	if (priv->dir != CIX_MBOX_RX)
+		return;
+
+	int_status = cix_mbox_read(priv, CIX_INT_STATUS);
+
+	if (int_status & CIX_FAST_CH_INT(cp->index)) {
+		cix_mbox_write(priv, CIX_FAST_CH_INT(cp->index), CIX_INT_CLEAR);
+		data = cix_mbox_read(priv, CIX_REG_F_INT(cp->index));
+		mbox_chan_received_data(chan, &data);
+	}
+}
+
+static irqreturn_t cix_mbox_isr(int irq, void *arg)
+{
+	struct mbox_chan *chan = arg;
+	struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+	struct cix_mbox_con_priv *cp = chan->con_priv;
+
+	switch (cp->type) {
+	case CIX_MBOX_TYPE_DB:
+		cix_mbox_isr_db(chan);
+		break;
+	case CIX_MBOX_TYPE_REG:
+		cix_mbox_isr_reg(chan);
+		break;
+	case CIX_MBOX_TYPE_FIFO:
+		cix_mbox_isr_fifo(chan);
+		break;
+	case CIX_MBOX_TYPE_FAST:
+		cix_mbox_isr_fast(chan);
+		break;
+	default:
+		dev_err(priv->dev, "Invalid channel type: %d\n", cp->type);
+		return IRQ_NONE;
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int cix_mbox_startup(struct mbox_chan *chan)
+{
+	struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+	struct cix_mbox_con_priv *cp = chan->con_priv;
+	int index = cp->index, ret;
+	u32 val;
+
+	ret = request_irq(priv->irq, cix_mbox_isr, IRQF_NO_SUSPEND,
+			  dev_name(priv->dev), chan);
+	if (ret) {
+		dev_err(priv->dev, "Unable to acquire IRQ %d\n", priv->irq);
+		return ret;
+	}
+
+	switch (cp->type) {
+	case CIX_MBOX_TYPE_DB:
+		/* Overwrite txdone_method for DB channel */
+		chan->txdone_method = MBOX_TXDONE_BY_ACK;
+		fallthrough;
+	case CIX_MBOX_TYPE_REG:
+		if (priv->dir == CIX_MBOX_TX) {
+			/* Enable ACK interrupt */
+			val = cix_mbox_read(priv, CIX_INT_ENABLE);
+			val |= CIX_ACK_INT;
+			cix_mbox_write(priv, val, CIX_INT_ENABLE);
+		} else {
+			/* Enable Doorbell interrupt */
+			val = cix_mbox_read(priv, CIX_INT_ENABLE_SIDE_B);
+			val |= CIX_DB_INT;
+			cix_mbox_write(priv, val, CIX_INT_ENABLE_SIDE_B);
+		}
+		break;
+	case CIX_MBOX_TYPE_FIFO:
+		/* reset fifo */
+		cix_mbox_write(priv, CIX_FIFO_RST_BIT, CIX_FIFO_RST);
+		/* set default watermark */
+		cix_mbox_write(priv, CIX_FIFO_WM_DEFAULT, CIX_FIFO_WM);
+		if (priv->dir == CIX_MBOX_TX) {
+			/* Enable fifo overflow interrupt */
+			val = cix_mbox_read(priv, CIX_INT_ENABLE);
+			val |= CIX_FIFO_OFLOW_INT;
+			cix_mbox_write(priv, val, CIX_INT_ENABLE);
+		} else {
+			/* Enable fifo full/underflow interrupt */
+			val = cix_mbox_read(priv, CIX_INT_ENABLE_SIDE_B);
+			val |= CIX_FIFO_UFLOW_INT|CIX_FIFO_WM01_INT;
+			cix_mbox_write(priv, val, CIX_INT_ENABLE_SIDE_B);
+		}
+		break;
+	case CIX_MBOX_TYPE_FAST:
+		/* Only RX channel has intterupt */
+		if (priv->dir == CIX_MBOX_RX) {
+			if (index < 0 || index > CIX_MBOX_FAST_IDX) {
+				dev_err(priv->dev, "Invalid index %d\n", index);
+				ret = -EINVAL;
+				goto failed;
+			}
+			/* enable fast channel interrupt */
+			val = cix_mbox_read(priv, CIX_INT_ENABLE_SIDE_B);
+			val |= CIX_FAST_CH_INT(index);
+			cix_mbox_write(priv, val, CIX_INT_ENABLE_SIDE_B);
+		}
+		break;
+	default:
+		dev_err(priv->dev, "Invalid channel type: %d\n", cp->type);
+		ret = -EINVAL;
+		goto failed;
+	}
+	return 0;
+
+failed:
+	free_irq(priv->irq, chan);
+	return ret;
+}
+
+static void cix_mbox_shutdown(struct mbox_chan *chan)
+{
+	struct cix_mbox_priv *priv = to_cix_mbox_priv(chan->mbox);
+	struct cix_mbox_con_priv *cp = chan->con_priv;
+	int index = cp->index;
+	u32 val;
+
+	switch (cp->type) {
+	case CIX_MBOX_TYPE_DB:
+	case CIX_MBOX_TYPE_REG:
+		if (priv->dir == CIX_MBOX_TX) {
+			/* Disable ACK interrupt */
+			val = cix_mbox_read(priv, CIX_INT_ENABLE);
+			val &= ~CIX_ACK_INT;
+			cix_mbox_write(priv, val, CIX_INT_ENABLE);
+		} else if (priv->dir == CIX_MBOX_RX) {
+			/* Disable Doorbell interrupt */
+			val = cix_mbox_read(priv, CIX_INT_ENABLE_SIDE_B);
+			val &= ~CIX_DB_INT;
+			cix_mbox_write(priv, val, CIX_INT_ENABLE_SIDE_B);
+		}
+		break;
+	case CIX_MBOX_TYPE_FIFO:
+		if (priv->dir == CIX_MBOX_TX) {
+			/* Disable empty/fifo overflow irq*/
+			val = cix_mbox_read(priv, CIX_INT_ENABLE);
+			val &= ~(CIX_FIFO_EMPTY_INT | CIX_FIFO_OFLOW_INT);
+			cix_mbox_write(priv, val, CIX_INT_ENABLE);
+		} else if (priv->dir == CIX_MBOX_RX) {
+			/* Disable fifo WM01/underflow interrupt */
+			val = cix_mbox_read(priv, CIX_INT_ENABLE_SIDE_B);
+			val &= ~(CIX_FIFO_UFLOW_INT | CIX_FIFO_WM01_INT);
+			cix_mbox_write(priv, val, CIX_INT_ENABLE_SIDE_B);
+		}
+		break;
+	case CIX_MBOX_TYPE_FAST:
+		if (priv->dir == CIX_MBOX_RX) {
+			if (index < 0 || index > CIX_MBOX_FAST_IDX) {
+				dev_err(priv->dev, "Invalid index %d\n", index);
+				break;
+			}
+			/* Disable fast channel interrupt */
+			val = cix_mbox_read(priv, CIX_INT_ENABLE_SIDE_B);
+			val &= ~CIX_FAST_CH_INT(index);
+			cix_mbox_write(priv, val, CIX_INT_ENABLE_SIDE_B);
+		}
+		break;
+
+	default:
+		dev_err(priv->dev, "Invalid channel type: %d\n", cp->type);
+		break;
+	}
+
+	free_irq(priv->irq, chan);
+}
+
+static const struct mbox_chan_ops cix_mbox_chan_ops = {
+	.send_data = cix_mbox_send_data,
+	.startup = cix_mbox_startup,
+	.shutdown = cix_mbox_shutdown,
+};
+
+static void cix_mbox_init(struct cix_mbox_priv *priv)
+{
+	struct cix_mbox_con_priv *cp;
+	int i;
+
+	for (i = 0; i < CIX_MBOX_CHANS; i++) {
+		cp = &priv->con_priv[i];
+		cp->index = i;
+		cp->chan = &priv->mbox_chans[i];
+		priv->mbox_chans[i].con_priv = cp;
+		if (cp->index <= CIX_MBOX_FAST_IDX)
+			cp->type = CIX_MBOX_TYPE_FAST;
+		if (cp->index == CIX_MBOX_DB_IDX)
+			cp->type = CIX_MBOX_TYPE_DB;
+		if (cp->index == CIX_MBOX_FIFO_IDX)
+			cp->type = CIX_MBOX_TYPE_FIFO;
+		if (cp->index == CIX_MBOX_REG_IDX)
+			cp->type = CIX_MBOX_TYPE_REG;
+	}
+}
+
+static int cix_mbox_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cix_mbox_priv *priv;
+	struct resource *res;
+	const char *dir_str;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+	priv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	/*
+	 * The first 0x80 bytes of the register space of the cix mailbox controller
+	 * can be used as shared memory for clients. When this shared memory is in
+	 * use, the base address of the mailbox is offset by 0x80. Therefore, when
+	 * performing subsequent read/write operations, it is necessary to subtract
+	 * the offset CIX_SHMEM_OFFSET.
+	 *
+	 * When the base address of the mailbox is offset by 0x80, it indicates
+	 * that shmem is in use.
+	 */
+	priv->use_shmem = !!(res->start & CIX_SHMEM_OFFSET);
+
+	priv->irq = platform_get_irq(pdev, 0);
+	if (priv->irq < 0)
+		return priv->irq;
+
+	if (device_property_read_string(dev, "cix,mbox-dir", &dir_str))
+		return dev_err_probe(dev, -EINVAL, "cix,mbox-dir property not found\n");
+
+	if (!strcmp(dir_str, "tx"))
+		priv->dir = 0;
+	else if (!strcmp(dir_str, "rx"))
+		priv->dir = 1;
+	else
+		return dev_err_probe(dev, -EINVAL, "cix,mbox-dir=%s is not expected\n", dir_str);
+
+	cix_mbox_init(priv);
+
+	priv->mbox.dev = dev;
+	priv->mbox.ops = &cix_mbox_chan_ops;
+	priv->mbox.chans = priv->mbox_chans;
+	priv->mbox.txdone_irq = true;
+	priv->mbox.num_chans = CIX_MBOX_CHANS;
+	priv->mbox.of_xlate = NULL;
+
+	platform_set_drvdata(pdev, priv);
+	ret = devm_mbox_controller_register(dev, &priv->mbox);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to register mailbox\n");
+
+	return 0;
+}
+
+static const struct of_device_id cix_mbox_dt_ids[] = {
+	{ .compatible = "cix,sky1-mbox" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, cix_mbox_dt_ids);
+
+static struct platform_driver cix_mbox_driver = {
+	.probe = cix_mbox_probe,
+	.driver = {
+		.name = "cix_mbox",
+		.of_match_table = cix_mbox_dt_ids,
+	},
+};
+
+static int __init cix_mailbox_init(void)
+{
+	return platform_driver_register(&cix_mbox_driver);
+}
+arch_initcall(cix_mailbox_init);
+
+MODULE_AUTHOR("Cix Technology Group Co., Ltd.");
+MODULE_DESCRIPTION("CIX mailbox driver");
+MODULE_LICENSE("GPL");