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/*
* Copyright 2023 Arm Limited and/or its affiliates
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU licence.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you can access it online at
* http://www.gnu.org/licenses/gpl-2.0.html.
*
* SPDX-License-Identifier: GPL-2.0-only
*/
/****************************************************************************
* Includes
****************************************************************************/
#include "ethosu_version.h"
#include "ethosu_core_rpmsg.h"
#include <linux/errno.h>
/****************************************************************************
* Defines
****************************************************************************/
#define VERSION_RESP_TIMEOUT_MS 2000
/****************************************************************************
* Functions
****************************************************************************/
static void ethosu_version_fail(struct ethosu_mailbox_msg *msg)
{
struct ethosu_version *version =
container_of(msg, typeof(*version), msg);
if (completion_done(&version->done))
return;
version->errno = -EFAULT;
complete(&version->done);
}
void ethosu_version_rsp(struct ethosu_mailbox *mailbox,
int msg_id,
struct ethosu_core_msg_version_rsp *rsp)
{
struct device *dev = mailbox->dev;
struct ethosu_mailbox_msg *msg;
struct ethosu_version *version;
msg = ethosu_mailbox_find(mailbox, msg_id,
ETHOSU_CORE_MSG_VERSION_REQ);
if (IS_ERR(msg)) {
dev_warn(dev,
"Id for version msg not found. Id=0x%0x: %ld\n",
msg_id, PTR_ERR(msg));
return;
}
version = container_of(msg, typeof(*version), msg);
if (completion_done(&version->done))
return;
if (rsp->major != ETHOSU_CORE_MSG_VERSION_MAJOR ||
rsp->minor != ETHOSU_CORE_MSG_VERSION_MINOR) {
dev_warn(dev,
"Msg: Protocol version mismatch. Expected %u.%u.X but got %u.%u.%u",
ETHOSU_CORE_MSG_VERSION_MAJOR,
ETHOSU_CORE_MSG_VERSION_MINOR,
rsp->major, rsp->minor, rsp->patch);
version->errno = -EPROTO;
} else {
version->errno = 0;
}
complete(&version->done);
}
int ethosu_version_check_request(struct device *dev,
struct ethosu_mailbox *mailbox)
{
struct ethosu_version *version;
int ret;
int timeout;
version = devm_kzalloc(dev, sizeof(*version), GFP_KERNEL);
if (!version)
return -ENOMEM;
version->dev = dev;
init_completion(&version->done);
version->msg.fail = ethosu_version_fail;
ret = ethosu_mailbox_register(mailbox, &version->msg);
if (ret < 0)
goto free_version;
dev_dbg(dev, "Protocol version request created. Id=0x%x, handle=%pK\n",
version->msg.id, version);
ret = ethosu_mailbox_version_request(mailbox, &version->msg);
if (ret)
goto deregister;
/* Unlock the mutex to not block other messages while waiting */
device_unlock(dev);
/* Wait for version response */
timeout = wait_for_completion_timeout(&version->done,
msecs_to_jiffies(
VERSION_RESP_TIMEOUT_MS));
/* Take back the mutex before resuming to do anything */
device_lock(dev);
if (0 == timeout) {
dev_warn(dev, "Protocol version response timeout");
ret = -ETIME;
goto deregister;
}
if (version->errno) {
ret = version->errno;
goto deregister;
}
deregister:
ethosu_mailbox_deregister(mailbox, &version->msg);
free_version:
dev_dbg(dev, "Protocol version destroy. Id=0x%x, handle=%pK\n",
version->msg.id,
version);
devm_kfree(dev, version);
return ret;
}
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