Message-Id: <4b74f1b6c1f9653241a1b5754525e230b3d76a3f.1579595093.git.viresh.kumar@linaro.org>
Date:   Tue, 21 Jan 2020 13:57:48 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     arnd@...db.de, Sudeep Holla <sudeep.holla@....com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>, jassisinghbrar@...il.com,
        cristian.marussi@....com, peng.fan@....com,
        peter.hilber@...nsynergy.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH V3] firmware: arm_scmi: Make scmi core independent of the transport type

The SCMI specification is fairly independent of the transport protocol,
which can be a simple mailbox (already implemented) or anything else.
The current Linux implementation however is very much dependent on the
mailbox transport layer.

This patch makes the SCMI core code (driver.c) independent of the
mailbox transport layer and moves all mailbox related code to a new
file: mailbox.c.

We can now implement more transport protocols to transport SCMI
messages.

The transport protocols just need to provide struct scmi_transport_ops,
with its version of the callbacks to enable exchange of SCMI messages.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
@Sudeep: Can you please help me getting this tested?

V2->V3:
- Added more ops to the structure to read/write/memcpy data
- Payload is moved to mailbox.c and is handled in transport specific way
  now. This resulted in lots of changes.

V1->V2:
- Dropped __iomem from payload data.
- Moved transport ops to scmi_desc, and that has a per transport
  instance now which is differentiated using the compatible string.
- Converted IS_ERR_OR_NULL to IS_ERR.

 drivers/firmware/arm_scmi/Makefile  |   3 +-
 drivers/firmware/arm_scmi/common.h  |  88 +++++++++++
 drivers/firmware/arm_scmi/driver.c  | 223 +++++++---------------------
 drivers/firmware/arm_scmi/mailbox.c | 202 +++++++++++++++++++++++++
 4 files changed, 343 insertions(+), 173 deletions(-)
 create mode 100644 drivers/firmware/arm_scmi/mailbox.c

diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile
index 5f298f00a82e..df2c05a545d8 100644
--- a/drivers/firmware/arm_scmi/Makefile
+++ b/drivers/firmware/arm_scmi/Makefile
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
-obj-y	= scmi-bus.o scmi-driver.o scmi-protocols.o
+obj-y	= scmi-bus.o scmi-driver.o scmi-protocols.o scmi-transport.o
 scmi-bus-y = bus.o
 scmi-driver-y = driver.o
+scmi-transport-y = mailbox.o
 scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o
 obj-$(CONFIG_ARM_SCMI_POWER_DOMAIN) += scmi_pm_domain.o
diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
index 5237c2ff79fe..fc3e427eb2cc 100644
--- a/drivers/firmware/arm_scmi/common.h
+++ b/drivers/firmware/arm_scmi/common.h
@@ -13,6 +13,7 @@
 #include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/scmi_protocol.h>
+#include <linux/stddef.h>
 #include <linux/types.h>
 
 #include <asm/unaligned.h>
@@ -111,3 +112,90 @@ void scmi_setup_protocol_implemented(const struct scmi_handle *handle,
 				     u8 *prot_imp);
 
 int scmi_base_protocol_init(struct scmi_handle *h);
+
+/* SCMI Transport */
+
+/*
+ * SCMI specification requires all parameters, message headers, return
+ * arguments or any protocol data to be expressed in little endian
+ * format only.
+ */
+struct scmi_shared_mem {
+	__le32 reserved;
+	__le32 channel_status;
+#define SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR	BIT(1)
+#define SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE	BIT(0)
+	__le32 reserved1[2];
+	__le32 flags;
+#define SCMI_SHMEM_FLAG_INTR_ENABLED	BIT(0)
+	__le32 length;
+	__le32 msg_header;
+	u8 msg_payload[0];
+};
+
+/* Offset of fields within the above structure */
+#define SHMEM_CHANNEL_STATUS		offsetof(struct scmi_shared_mem, channel_status)
+#define SHMEM_FLAGS			offsetof(struct scmi_shared_mem, flags)
+#define SHMEM_LENGTH			offsetof(struct scmi_shared_mem, length)
+#define SHMEM_MSG_HEADER		offsetof(struct scmi_shared_mem, msg_header)
+#define SHMEM_MSG_PAYLOAD		offsetof(struct scmi_shared_mem, msg_payload)
+
+struct scmi_info;
+
+/**
+ * struct scmi_chan_info - Structure representing a SCMI channel information
+ *
+ * @payload: Transmit/Receive payload area
+ * @dev: Reference to device in the SCMI hierarchy corresponding to this
+ *	 channel
+ * @handle: Pointer to SCMI entity handle
+ * @transport_info: Transport layer related information
+ */
+struct scmi_chan_info {
+	struct scmi_info *info;
+	struct device *dev;
+	struct scmi_handle *handle;
+	void *transport_info;
+};
+
+/**
+ * struct scmi_transport_ops - Structure representing a SCMI transport ops
+ *
+ * @send_message: Callback to send a message
+ * @mark_txdone: Callback to mark tx as done
+ * @chan_setup: Callback to allocate and setup a channel
+ * @chan_free: Callback to free a channel
+ */
+struct scmi_transport_ops {
+	bool (*chan_available)(struct device *dev, int idx);
+	int (*chan_setup)(struct scmi_chan_info *cinfo, struct device *dev, bool tx);
+	int (*chan_free)(int id, void *p, void *data);
+	int (*send_message)(struct scmi_chan_info *cinfo, struct scmi_xfer *xfer);
+	void (*mark_txdone)(struct scmi_chan_info *cinfo, int ret);
+	u32 (*read32)(struct scmi_chan_info *cinfo, unsigned int offset);
+	void (*write32)(struct scmi_chan_info *cinfo, u32 val, unsigned int offset);
+	void (*memcpy_from)(struct scmi_chan_info *cinfo, void *to, unsigned int offset, long len);
+	void (*memcpy_to)(struct scmi_chan_info *cinfo, unsigned int offset, void *from, long len);
+
+};
+
+/**
+ * struct scmi_desc - Description of SoC integration
+ *
+ * @max_rx_timeout_ms: Timeout for communication with SoC (in Milliseconds)
+ * @max_msg: Maximum number of messages that can be pending
+ *	simultaneously in the system
+ * @max_msg_size: Maximum size of data per message that can be handled.
+ */
+struct scmi_desc {
+	struct scmi_transport_ops *ops;
+	int max_rx_timeout_ms;
+	int max_msg;
+	int max_msg_size;
+};
+
+extern const struct scmi_desc scmi_mailbox_desc;
+
+void scmi_tx_prepare(struct scmi_chan_info *cinfo, struct scmi_xfer *t);
+void scmi_rx_callback(struct scmi_chan_info *cinfo, struct scmi_xfer *t);
+void scmi_free_channel(struct scmi_chan_info *cinfo, struct idr *idr, int id);
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 3eb0382491ce..c34b283685c5 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -19,7 +19,6 @@
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/ktime.h>
-#include <linux/mailbox_client.h>
 #include <linux/module.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
@@ -77,38 +76,6 @@ struct scmi_xfers_info {
 	spinlock_t xfer_lock;
 };
 
-/**
- * struct scmi_desc - Description of SoC integration
- *
- * @max_rx_timeout_ms: Timeout for communication with SoC (in Milliseconds)
- * @max_msg: Maximum number of messages that can be pending
- *	simultaneously in the system
- * @max_msg_size: Maximum size of data per message that can be handled.
- */
-struct scmi_desc {
-	int max_rx_timeout_ms;
-	int max_msg;
-	int max_msg_size;
-};
-
-/**
- * struct scmi_chan_info - Structure representing a SCMI channel information
- *
- * @cl: Mailbox Client
- * @chan: Transmit/Receive mailbox channel
- * @payload: Transmit/Receive mailbox channel payload area
- * @dev: Reference to device in the SCMI hierarchy corresponding to this
- *	 channel
- * @handle: Pointer to SCMI entity handle
- */
-struct scmi_chan_info {
-	struct mbox_client cl;
-	struct mbox_chan *chan;
-	void __iomem *payload;
-	struct device *dev;
-	struct scmi_handle *handle;
-};
-
 /**
  * struct scmi_info - Structure representing a SCMI instance
  *
@@ -138,27 +105,8 @@ struct scmi_info {
 	int users;
 };
 
-#define client_to_scmi_chan_info(c) container_of(c, struct scmi_chan_info, cl)
 #define handle_to_scmi_info(h)	container_of(h, struct scmi_info, handle)
 
-/*
- * SCMI specification requires all parameters, message headers, return
- * arguments or any protocol data to be expressed in little endian
- * format only.
- */
-struct scmi_shared_mem {
-	__le32 reserved;
-	__le32 channel_status;
-#define SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR	BIT(1)
-#define SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE	BIT(0)
-	__le32 reserved1[2];
-	__le32 flags;
-#define SCMI_SHMEM_FLAG_INTR_ENABLED	BIT(0)
-	__le32 length;
-	__le32 msg_header;
-	u8 msg_payload[0];
-};
-
 static const int scmi_linux_errmap[] = {
 	/* better than switch case as long as return value is continuous */
 	0,			/* SCMI_SUCCESS */
@@ -194,15 +142,17 @@ static inline void scmi_dump_header_dbg(struct device *dev,
 		hdr->id, hdr->seq, hdr->protocol_id);
 }
 
-static void scmi_fetch_response(struct scmi_xfer *xfer,
-				struct scmi_shared_mem __iomem *mem)
+static void scmi_fetch_response(struct scmi_chan_info *cinfo,
+				struct scmi_xfer *xfer)
 {
-	xfer->hdr.status = ioread32(mem->msg_payload);
+	struct scmi_transport_ops *ops = cinfo->info->desc->ops;
+
+	xfer->hdr.status = ops->read32(cinfo, SHMEM_MSG_PAYLOAD);
 	/* Skip the length of header and status in payload area i.e 8 bytes */
-	xfer->rx.len = min_t(size_t, xfer->rx.len, ioread32(&mem->length) - 8);
+	xfer->rx.len = min_t(size_t, xfer->rx.len, ops->read32(cinfo, SHMEM_LENGTH) - 8);
 
 	/* Take a copy to the rx buffer.. */
-	memcpy_fromio(xfer->rx.buf, mem->msg_payload + 4, xfer->rx.len);
+	ops->memcpy_from(cinfo, xfer->rx.buf, SHMEM_MSG_PAYLOAD + 4, xfer->rx.len);
 }
 
 /**
@@ -233,19 +183,17 @@ static inline void unpack_scmi_header(u32 msg_hdr, struct scmi_msg_hdr *hdr)
 }
 
 /**
- * scmi_tx_prepare() - mailbox client callback to prepare for the transfer
+ * scmi_tx_prepare() - callback to prepare for the transfer
  *
- * @cl: client pointer
- * @m: mailbox message
+ * @cinfo: SCMI channel info
+ * @t: transfer message
  *
  * This function prepares the shared memory which contains the header and the
  * payload.
  */
-static void scmi_tx_prepare(struct mbox_client *cl, void *m)
+void scmi_tx_prepare(struct scmi_chan_info *cinfo, struct scmi_xfer *t)
 {
-	struct scmi_xfer *t = m;
-	struct scmi_chan_info *cinfo = client_to_scmi_chan_info(cl);
-	struct scmi_shared_mem __iomem *mem = cinfo->payload;
+	struct scmi_transport_ops *ops = cinfo->info->desc->ops;
 
 	/*
 	 * Ideally channel must be free by now unless OS timeout last
@@ -253,16 +201,17 @@ static void scmi_tx_prepare(struct mbox_client *cl, void *m)
 	 * until it releases the shared memory, otherwise we may endup
 	 * overwriting its response with new message payload or vice-versa
 	 */
-	spin_until_cond(ioread32(&mem->channel_status) &
+	spin_until_cond(ops->read32(cinfo, SHMEM_CHANNEL_STATUS) &
 			SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE);
 	/* Mark channel busy + clear error */
-	iowrite32(0x0, &mem->channel_status);
-	iowrite32(t->hdr.poll_completion ? 0 : SCMI_SHMEM_FLAG_INTR_ENABLED,
-		  &mem->flags);
-	iowrite32(sizeof(mem->msg_header) + t->tx.len, &mem->length);
-	iowrite32(pack_scmi_header(&t->hdr), &mem->msg_header);
+	ops->write32(cinfo, 0x0, SHMEM_CHANNEL_STATUS);
+	ops->write32(cinfo,
+		     t->hdr.poll_completion ? 0 : SCMI_SHMEM_FLAG_INTR_ENABLED,
+		     SHMEM_FLAGS);
+	ops->write32(cinfo, sizeof(((struct scmi_shared_mem *)0)->msg_header) + t->tx.len, SHMEM_LENGTH);
+	ops->write32(cinfo, pack_scmi_header(&t->hdr), SHMEM_MSG_HEADER);
 	if (t->tx.buf)
-		memcpy_toio(mem->msg_payload, t->tx.buf, t->tx.len);
+		ops->memcpy_to(cinfo, SHMEM_MSG_PAYLOAD, t->tx.buf, t->tx.len);
 }
 
 /**
@@ -332,10 +281,10 @@ __scmi_xfer_put(struct scmi_xfers_info *minfo, struct scmi_xfer *xfer)
 }
 
 /**
- * scmi_rx_callback() - mailbox client callback for receive messages
+ * scmi_rx_callback() - callback for receiving messages
  *
- * @cl: client pointer
- * @m: mailbox message
+ * @cinfo: SCMI channel info
+ * @t: transfer message
  *
  * Processes one received message to appropriate transfer information and
  * signals completion of the transfer.
@@ -343,19 +292,17 @@ __scmi_xfer_put(struct scmi_xfers_info *minfo, struct scmi_xfer *xfer)
  * NOTE: This function will be invoked in IRQ context, hence should be
  * as optimal as possible.
  */
-static void scmi_rx_callback(struct mbox_client *cl, void *m)
+void scmi_rx_callback(struct scmi_chan_info *cinfo, struct scmi_xfer *t)
 {
 	u8 msg_type;
 	u32 msg_hdr;
 	u16 xfer_id;
 	struct scmi_xfer *xfer;
-	struct scmi_chan_info *cinfo = client_to_scmi_chan_info(cl);
 	struct device *dev = cinfo->dev;
 	struct scmi_info *info = handle_to_scmi_info(cinfo->handle);
 	struct scmi_xfers_info *minfo = &info->tx_minfo;
-	struct scmi_shared_mem __iomem *mem = cinfo->payload;
 
-	msg_hdr = ioread32(&mem->msg_header);
+	msg_hdr = cinfo->info->desc->ops->read32(cinfo, SHMEM_MSG_HEADER);
 	msg_type = MSG_XTRACT_TYPE(msg_hdr);
 	xfer_id = MSG_XTRACT_TOKEN(msg_hdr);
 
@@ -372,7 +319,7 @@ static void scmi_rx_callback(struct mbox_client *cl, void *m)
 
 	scmi_dump_header_dbg(dev, &xfer->hdr);
 
-	scmi_fetch_response(xfer, mem);
+	scmi_fetch_response(cinfo, xfer);
 
 	if (msg_type == MSG_TYPE_DELAYED_RESP)
 		complete(xfer->async_done);
@@ -394,22 +341,22 @@ void scmi_xfer_put(const struct scmi_handle *handle, struct scmi_xfer *xfer)
 }
 
 static bool
-scmi_xfer_poll_done(const struct scmi_chan_info *cinfo, struct scmi_xfer *xfer)
+scmi_xfer_poll_done(struct scmi_chan_info *cinfo, struct scmi_xfer *xfer)
 {
-	struct scmi_shared_mem __iomem *mem = cinfo->payload;
-	u16 xfer_id = MSG_XTRACT_TOKEN(ioread32(&mem->msg_header));
+	struct scmi_transport_ops *ops = cinfo->info->desc->ops;
+	u16 xfer_id = MSG_XTRACT_TOKEN(ops->read32(cinfo, SHMEM_MSG_HEADER));
 
 	if (xfer->hdr.seq != xfer_id)
 		return false;
 
-	return ioread32(&mem->channel_status) &
+	return ops->read32(cinfo, SHMEM_CHANNEL_STATUS) &
 		(SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR |
 		SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE);
 }
 
 #define SCMI_MAX_POLL_TO_NS	(100 * NSEC_PER_USEC)
 
-static bool scmi_xfer_done_no_timeout(const struct scmi_chan_info *cinfo,
+static bool scmi_xfer_done_no_timeout(struct scmi_chan_info *cinfo,
 				      struct scmi_xfer *xfer, ktime_t stop)
 {
 	ktime_t __cur = ktime_get();
@@ -439,29 +386,26 @@ int scmi_do_xfer(const struct scmi_handle *handle, struct scmi_xfer *xfer)
 	if (unlikely(!cinfo))
 		return -EINVAL;
 
-	ret = mbox_send_message(cinfo->chan, xfer);
+	ret = info->desc->ops->send_message(cinfo, xfer);
 	if (ret < 0) {
-		dev_dbg(dev, "mbox send fail %d\n", ret);
+		dev_dbg(dev, "Failed to send message %d\n", ret);
 		return ret;
 	}
 
-	/* mbox_send_message returns non-negative value on success, so reset */
-	ret = 0;
-
 	if (xfer->hdr.poll_completion) {
 		ktime_t stop = ktime_add_ns(ktime_get(), SCMI_MAX_POLL_TO_NS);
 
 		spin_until_cond(scmi_xfer_done_no_timeout(cinfo, xfer, stop));
 
 		if (ktime_before(ktime_get(), stop))
-			scmi_fetch_response(xfer, cinfo->payload);
+			scmi_fetch_response(cinfo, xfer);
 		else
 			ret = -ETIMEDOUT;
 	} else {
 		/* And we wait for the response. */
 		timeout = msecs_to_jiffies(info->desc->max_rx_timeout_ms);
 		if (!wait_for_completion_timeout(&xfer->done, timeout)) {
-			dev_err(dev, "mbox timed out in resp(caller: %pS)\n",
+			dev_err(dev, "timed out in resp(caller: %pS)\n",
 				(void *)_RET_IP_);
 			ret = -ETIMEDOUT;
 		}
@@ -470,13 +414,7 @@ int scmi_do_xfer(const struct scmi_handle *handle, struct scmi_xfer *xfer)
 	if (!ret && xfer->hdr.status)
 		ret = scmi_to_linux_errno(xfer->hdr.status);
 
-	/*
-	 * NOTE: we might prefer not to need the mailbox ticker to manage the
-	 * transfer queueing since the protocol layer queues things by itself.
-	 * Unfortunately, we have to kick the mailbox framework after we have
-	 * received our message.
-	 */
-	mbox_client_txdone(cinfo->chan, ret);
+	info->desc->ops->mark_txdone(cinfo, ret);
 
 	return ret;
 }
@@ -713,29 +651,18 @@ static int scmi_xfer_info_init(struct scmi_info *sinfo)
 	return 0;
 }
 
-static int scmi_mailbox_check(struct device_node *np, int idx)
-{
-	return of_parse_phandle_with_args(np, "mboxes", "#mbox-cells",
-					  idx, NULL);
-}
-
-static int scmi_mbox_chan_setup(struct scmi_info *info, struct device *dev,
-				int prot_id, bool tx)
+static int scmi_chan_setup(struct scmi_info *info, struct device *dev,
+			   int prot_id, bool tx)
 {
 	int ret, idx;
-	struct resource res;
-	resource_size_t size;
-	struct device_node *shmem, *np = dev->of_node;
 	struct scmi_chan_info *cinfo;
-	struct mbox_client *cl;
 	struct idr *idr;
-	const char *desc = tx ? "Tx" : "Rx";
 
 	/* Transmit channel is first entry i.e. index 0 */
 	idx = tx ? 0 : 1;
 	idr = tx ? &info->tx_idr : &info->rx_idr;
 
-	if (scmi_mailbox_check(np, idx)) {
+	if (!info->desc->ops->chan_available(dev, idx)) {
 		cinfo = idr_find(idr, SCMI_PROTOCOL_BASE);
 		if (unlikely(!cinfo)) /* Possible only if platform has no Rx */
 			return -EINVAL;
@@ -747,37 +674,11 @@ static int scmi_mbox_chan_setup(struct scmi_info *info, struct device *dev,
 		return -ENOMEM;
 
 	cinfo->dev = dev;
+	cinfo->info = info;
 
-	cl = &cinfo->cl;
-	cl->dev = dev;
-	cl->rx_callback = scmi_rx_callback;
-	cl->tx_prepare = tx ? scmi_tx_prepare : NULL;
-	cl->tx_block = false;
-	cl->knows_txdone = tx;
-
-	shmem = of_parse_phandle(np, "shmem", idx);
-	ret = of_address_to_resource(shmem, 0, &res);
-	of_node_put(shmem);
-	if (ret) {
-		dev_err(dev, "failed to get SCMI %s payload memory\n", desc);
-		return ret;
-	}
-
-	size = resource_size(&res);
-	cinfo->payload = devm_ioremap(info->dev, res.start, size);
-	if (!cinfo->payload) {
-		dev_err(dev, "failed to ioremap SCMI %s payload\n", desc);
-		return -EADDRNOTAVAIL;
-	}
-
-	cinfo->chan = mbox_request_channel(cl, idx);
-	if (IS_ERR(cinfo->chan)) {
-		ret = PTR_ERR(cinfo->chan);
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "failed to request SCMI %s mailbox\n",
-				desc);
+	ret = info->desc->ops->chan_setup(cinfo, info->dev, tx);
+	if (ret)
 		return ret;
-	}
 
 idr_alloc:
 	ret = idr_alloc(idr, cinfo, prot_id, prot_id + 1, GFP_KERNEL);
@@ -791,12 +692,12 @@ static int scmi_mbox_chan_setup(struct scmi_info *info, struct device *dev,
 }
 
 static inline int
-scmi_mbox_txrx_setup(struct scmi_info *info, struct device *dev, int prot_id)
+scmi_txrx_setup(struct scmi_info *info, struct device *dev, int prot_id)
 {
-	int ret = scmi_mbox_chan_setup(info, dev, prot_id, true);
+	int ret = scmi_chan_setup(info, dev, prot_id, true);
 
 	if (!ret) /* Rx is optional, hence no error check */
-		scmi_mbox_chan_setup(info, dev, prot_id, false);
+		scmi_chan_setup(info, dev, prot_id, false);
 
 	return ret;
 }
@@ -814,7 +715,7 @@ scmi_create_protocol_device(struct device_node *np, struct scmi_info *info,
 		return;
 	}
 
-	if (scmi_mbox_txrx_setup(info, &sdev->dev, prot_id)) {
+	if (scmi_txrx_setup(info, &sdev->dev, prot_id)) {
 		dev_err(&sdev->dev, "failed to setup transport\n");
 		scmi_device_destroy(sdev);
 		return;
@@ -833,12 +734,6 @@ static int scmi_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *child, *np = dev->of_node;
 
-	/* Only mailbox method supported, check for the presence of one */
-	if (scmi_mailbox_check(np, 0)) {
-		dev_err(dev, "no mailbox found in %pOF\n", np);
-		return -EINVAL;
-	}
-
 	desc = of_device_get_match_data(dev);
 	if (!desc)
 		return -EINVAL;
@@ -863,7 +758,7 @@ static int scmi_probe(struct platform_device *pdev)
 	handle->dev = info->dev;
 	handle->version = &info->version;
 
-	ret = scmi_mbox_txrx_setup(info, dev, SCMI_PROTOCOL_BASE);
+	ret = scmi_txrx_setup(info, dev, SCMI_PROTOCOL_BASE);
 	if (ret)
 		return ret;
 
@@ -898,19 +793,9 @@ static int scmi_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int scmi_mbox_free_channel(int id, void *p, void *data)
+void scmi_free_channel(struct scmi_chan_info *cinfo, struct idr *idr, int id)
 {
-	struct scmi_chan_info *cinfo = p;
-	struct idr *idr = data;
-
-	if (!IS_ERR_OR_NULL(cinfo->chan)) {
-		mbox_free_channel(cinfo->chan);
-		cinfo->chan = NULL;
-	}
-
 	idr_remove(idr, id);
-
-	return 0;
 }
 
 static int scmi_remove(struct platform_device *pdev)
@@ -930,25 +815,19 @@ static int scmi_remove(struct platform_device *pdev)
 		return ret;
 
 	/* Safe to free channels since no more users */
-	ret = idr_for_each(idr, scmi_mbox_free_channel, idr);
+	ret = idr_for_each(idr, info->desc->ops->chan_free, idr);
 	idr_destroy(&info->tx_idr);
 
 	idr = &info->rx_idr;
-	ret = idr_for_each(idr, scmi_mbox_free_channel, idr);
+	ret = idr_for_each(idr, info->desc->ops->chan_free, idr);
 	idr_destroy(&info->rx_idr);
 
 	return ret;
 }
 
-static const struct scmi_desc scmi_generic_desc = {
-	.max_rx_timeout_ms = 30,	/* We may increase this if required */
-	.max_msg = 20,		/* Limited by MBOX_TX_QUEUE_LEN */
-	.max_msg_size = 128,
-};
-
 /* Each compatible listed below must have descriptor associated with it */
 static const struct of_device_id scmi_of_match[] = {
-	{ .compatible = "arm,scmi", .data = &scmi_generic_desc },
+	{ .compatible = "arm,scmi", .data = &scmi_mailbox_desc },
 	{ /* Sentinel */ },
 };
 
diff --git a/drivers/firmware/arm_scmi/mailbox.c b/drivers/firmware/arm_scmi/mailbox.c
new file mode 100644
index 000000000000..7509e7eb262a
--- /dev/null
+++ b/drivers/firmware/arm_scmi/mailbox.c
@@ -0,0 +1,202 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System Control and Management Interface (SCMI) Message Mailbox Transport
+ * driver.
+ *
+ * Copyright (C) 2019 ARM Ltd.
+ */
+
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/mailbox_client.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+
+#include "common.h"
+
+/**
+ * struct scmi_mailbox - Structure representing a SCMI mailbox transport
+ *
+ * @cl: Mailbox Client
+ * @chan: Transmit/Receive mailbox channel
+ * @cinfo: SCMI channel info
+ */
+struct scmi_mailbox {
+	struct mbox_client cl;
+	struct mbox_chan *chan;
+	struct scmi_chan_info *cinfo;
+	void __iomem *payload;
+};
+
+#define client_to_scmi_mailbox(c) container_of(c, struct scmi_mailbox, cl)
+
+static bool mailbox_chan_available(struct device *dev, int idx)
+{
+	return !of_parse_phandle_with_args(dev->of_node, "mboxes",
+					   "#mbox-cells", idx, NULL);
+}
+
+static void mailbox_tx_prepare(struct mbox_client *cl, void *m)
+{
+	struct scmi_mailbox *smbox = client_to_scmi_mailbox(cl);
+	struct scmi_chan_info *cinfo = smbox->cinfo;
+
+	scmi_tx_prepare(cinfo, m);
+}
+
+static void mailbox_rx_callback(struct mbox_client *cl, void *m)
+{
+	struct scmi_mailbox *smbox = client_to_scmi_mailbox(cl);
+	struct scmi_chan_info *cinfo = smbox->cinfo;
+
+	scmi_rx_callback(cinfo, m);
+}
+
+static int mailbox_chan_setup(struct scmi_chan_info *cinfo, struct device *dev,
+			      bool tx)
+{
+	const char *desc = tx ? "Tx" : "Rx";
+	struct device *cdev = cinfo->dev;
+	struct scmi_mailbox *smbox;
+	struct device_node *shmem;
+	int ret, idx = tx ? 0 : 1;
+	struct mbox_client *cl;
+	resource_size_t size;
+	struct resource res;
+
+	smbox = devm_kzalloc(cdev, sizeof(*smbox), GFP_KERNEL);
+	if (!smbox)
+		return -ENOMEM;
+
+	shmem = of_parse_phandle(cdev->of_node, "shmem", idx);
+	ret = of_address_to_resource(shmem, 0, &res);
+	of_node_put(shmem);
+	if (ret) {
+		dev_err(cdev, "failed to get SCMI %s payload memory\n", desc);
+		return ret;
+	}
+
+	size = resource_size(&res);
+	smbox->payload = devm_ioremap(dev, res.start, size);
+	if (!smbox->payload) {
+		dev_err(dev, "failed to ioremap SCMI %s payload\n", desc);
+		return -EADDRNOTAVAIL;
+	}
+
+	cl = &smbox->cl;
+	cl->dev = cdev;
+	cl->tx_prepare = tx ? mailbox_tx_prepare : NULL;
+	cl->rx_callback = mailbox_rx_callback;
+	cl->tx_block = false;
+	cl->knows_txdone = tx;
+
+	smbox->chan = mbox_request_channel(cl, tx ? 0 : 1);
+	if (IS_ERR(smbox->chan)) {
+		ret = PTR_ERR(smbox->chan);
+		if (ret != -EPROBE_DEFER)
+			dev_err(cdev, "failed to request SCMI %s mailbox\n",
+				tx ? "Tx" : "Rx");
+		return ret;
+	}
+
+	cinfo->transport_info = smbox;
+	smbox->cinfo = cinfo;
+
+	return 0;
+}
+
+static int mailbox_chan_free(int id, void *p, void *data)
+{
+	struct scmi_chan_info *cinfo = p;
+	struct scmi_mailbox *smbox = cinfo->transport_info;
+
+	if (!IS_ERR(smbox->chan)) {
+		mbox_free_channel(smbox->chan);
+		cinfo->transport_info = NULL;
+		smbox->chan = NULL;
+		smbox->cinfo = NULL;
+	}
+
+	scmi_free_channel(cinfo, data, id);
+
+	return 0;
+}
+
+static int mailbox_send_message(struct scmi_chan_info *cinfo,
+				struct scmi_xfer *xfer)
+{
+	struct scmi_mailbox *smbox = cinfo->transport_info;
+	int ret;
+
+	ret = mbox_send_message(smbox->chan, xfer);
+
+	/* mbox_send_message returns non-negative value on success, so reset */
+	if (ret > 0)
+		ret = 0;
+
+	return ret;
+}
+
+static void mailbox_mark_txdone(struct scmi_chan_info *cinfo, int ret)
+{
+	struct scmi_mailbox *smbox = cinfo->transport_info;
+
+	/*
+	 * NOTE: we might prefer not to need the mailbox ticker to manage the
+	 * transfer queueing since the protocol layer queues things by itself.
+	 * Unfortunately, we have to kick the mailbox framework after we have
+	 * received our message.
+	 */
+	mbox_client_txdone(smbox->chan, ret);
+}
+
+static u32 mailbox_read32(struct scmi_chan_info *cinfo, unsigned int offset)
+{
+	struct scmi_mailbox *smbox = cinfo->transport_info;
+
+	return ioread32(smbox->payload + offset);
+}
+
+static void mailbox_write32(struct scmi_chan_info *cinfo, u32 val,
+			    unsigned int offset)
+{
+	struct scmi_mailbox *smbox = cinfo->transport_info;
+
+	iowrite32(val, smbox->payload + offset);
+}
+
+static void mailbox_memcpy_from(struct scmi_chan_info *cinfo, void *to,
+				unsigned int offset, long len)
+{
+	struct scmi_mailbox *smbox = cinfo->transport_info;
+
+	memcpy_fromio(to, smbox->payload + offset, len);
+}
+
+static void mailbox_memcpy_to(struct scmi_chan_info *cinfo, unsigned int offset,
+			      void *from, long len)
+{
+	struct scmi_mailbox *smbox = cinfo->transport_info;
+
+	memcpy_toio(smbox->payload + offset, from, len);
+}
+
+static struct scmi_transport_ops scmi_mailbox_ops = {
+	.chan_available = mailbox_chan_available,
+	.chan_setup = mailbox_chan_setup,
+	.chan_free = mailbox_chan_free,
+	.send_message = mailbox_send_message,
+	.mark_txdone = mailbox_mark_txdone,
+	.read32 = mailbox_read32,
+	.write32 = mailbox_write32,
+	.memcpy_from = mailbox_memcpy_from,
+	.memcpy_to = mailbox_memcpy_to,
+};
+
+const struct scmi_desc scmi_mailbox_desc = {
+	.ops = &scmi_mailbox_ops,
+	.max_rx_timeout_ms = 30, /* We may increase this if required */
+	.max_msg = 20, /* Limited by MBOX_TX_QUEUE_LEN */
+	.max_msg_size = 128,
+};
-- 
2.21.0.rc0.269.g1a574e7a288b

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