1 files changed, 0 insertions, 205 deletions
diff --git a/drivers/firmware/arm_scmi/mailbox.c b/drivers/firmware/arm_scmi/mailbox.c
deleted file mode 100644
index 1e40cb035044..000000000000
--- a/drivers/firmware/arm_scmi/mailbox.c
+++ /dev/null
@@ -1,205 +0,0 @@
-// 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
- * @shmem: Transmit/Receive shared memory area
- */
-struct scmi_mailbox {
-	struct mbox_client cl;
-	struct mbox_chan *chan;
-	struct scmi_chan_info *cinfo;
-	struct scmi_shared_mem __iomem *shmem;
-};
-
-#define client_to_scmi_mailbox(c) container_of(c, struct scmi_mailbox, cl)
-
-static void tx_prepare(struct mbox_client *cl, void *m)
-{
-	struct scmi_mailbox *smbox = client_to_scmi_mailbox(cl);
-
-	shmem_tx_prepare(smbox->shmem, m, smbox->cinfo);
-}
-
-static void rx_callback(struct mbox_client *cl, void *m)
-{
-	struct scmi_mailbox *smbox = client_to_scmi_mailbox(cl);
-
-	scmi_rx_callback(smbox->cinfo, shmem_read_header(smbox->shmem), NULL);
-}
-
-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 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(dev, sizeof(*smbox), GFP_KERNEL);
-	if (!smbox)
-		return -ENOMEM;
-
-	shmem = of_parse_phandle(cdev->of_node, "shmem", idx);
-	if (!of_device_is_compatible(shmem, "arm,scmi-shmem"))
-		return -ENXIO;
-
-	ret = of_address_to_resource(shmem, 0, &res);
-	of_node_put(shmem);
-	if (ret) {
-		dev_err(cdev, "failed to get SCMI %s shared memory\n", desc);
-		return ret;
-	}
-
-	size = resource_size(&res);
-	smbox->shmem = devm_ioremap(dev, res.start, size);
-	if (!smbox->shmem) {
-		dev_err(dev, "failed to ioremap SCMI %s shared memory\n", desc);
-		return -EADDRNOTAVAIL;
-	}
-
-	cl = &smbox->cl;
-	cl->dev = cdev;
-	cl->tx_prepare = tx ? tx_prepare : NULL;
-	cl->rx_callback = 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 (smbox && !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_xfer *__unused)
-{
-	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 void mailbox_fetch_response(struct scmi_chan_info *cinfo,
-				   struct scmi_xfer *xfer)
-{
-	struct scmi_mailbox *smbox = cinfo->transport_info;
-
-	shmem_fetch_response(smbox->shmem, xfer);
-}
-
-static void mailbox_fetch_notification(struct scmi_chan_info *cinfo,
-				       size_t max_len, struct scmi_xfer *xfer)
-{
-	struct scmi_mailbox *smbox = cinfo->transport_info;
-
-	shmem_fetch_notification(smbox->shmem, max_len, xfer);
-}
-
-static void mailbox_clear_channel(struct scmi_chan_info *cinfo)
-{
-	struct scmi_mailbox *smbox = cinfo->transport_info;
-
-	shmem_clear_channel(smbox->shmem);
-}
-
-static bool
-mailbox_poll_done(struct scmi_chan_info *cinfo, struct scmi_xfer *xfer)
-{
-	struct scmi_mailbox *smbox = cinfo->transport_info;
-
-	return shmem_poll_done(smbox->shmem, xfer);
-}
-
-static const 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,
-	.fetch_response = mailbox_fetch_response,
-	.fetch_notification = mailbox_fetch_notification,
-	.clear_channel = mailbox_clear_channel,
-	.poll_done = mailbox_poll_done,
-};
-
-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,
-};