| /* |
| * 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; |
| } |