// SPDX-License-Identifier: GPL-2.0
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/*
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* Rockchip Remote Processors Messaging Test.
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*
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* Copyright (c) 2022 Rockchip Electronics Co. Ltd.
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* Author: Hongming Zou <hongming.zou@rock-chips.com>
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*/
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/rpmsg.h>
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#include <linux/rpmsg/rockchip_rpmsg.h>
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#include <linux/time.h>
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#include <linux/virtio.h>
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#define LINUX_TEST_MSG_1 "Announce master ept id!"
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#define LINUX_TEST_MSG_2 "Rockchip rpmsg linux test pingpong!"
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#define MSG_LIMIT 10000
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/* different processor cores may need to adjust the value of this definition */
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#define LINUX_RPMSG_COMPENSATION (1) //ms
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struct rpmsg_info_t {
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int rx_count;
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};
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static int rockchip_rpmsg_test_cb(struct rpmsg_device *rp, void *payload,
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int payload_len, void *priv, u32 src)
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{
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int ret;
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uint32_t remote_ept_id;
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struct rpmsg_info_t *info = dev_get_drvdata(&rp->dev);
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remote_ept_id = src;
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dev_info(&rp->dev, "rx msg %s rx_count %d(remote_ept_id: 0x%x)\n",
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(char *)payload, ++info->rx_count, remote_ept_id);
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/* test should not live forever */
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if (info->rx_count >= MSG_LIMIT) {
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dev_info(&rp->dev, "Rockchip rpmsg test exit!\n");
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return 0;
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}
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mdelay(LINUX_RPMSG_COMPENSATION);
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/* send a new message now */
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ret = rpmsg_sendto(rp->ept, LINUX_TEST_MSG_2, strlen(LINUX_TEST_MSG_2), remote_ept_id);
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if (ret)
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dev_err(&rp->dev, "rpmsg_send failed: %d\n", ret);
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return ret;
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}
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static int rockchip_rpmsg_test_probe(struct rpmsg_device *rp)
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{
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int ret;
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uint32_t master_ept_id, remote_ept_id;
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struct rpmsg_info_t *info;
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master_ept_id = rp->src;
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remote_ept_id = rp->dst;
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dev_info(&rp->dev, "new channel: 0x%x -> 0x%x!\n", master_ept_id, remote_ept_id);
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info = devm_kzalloc(&rp->dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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dev_set_drvdata(&rp->dev, info);
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/*
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* send a message to our remote processor, and tell remote
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* processor about this channel
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*/
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ret = rpmsg_send(rp->ept, LINUX_TEST_MSG_1, strlen(LINUX_TEST_MSG_1));
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if (ret) {
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dev_err(&rp->dev, "rpmsg_send failed: %d\n", ret);
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return ret;
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}
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mdelay(LINUX_RPMSG_COMPENSATION);
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ret = rpmsg_sendto(rp->ept, LINUX_TEST_MSG_2, strlen(LINUX_TEST_MSG_2), remote_ept_id);
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if (ret) {
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dev_err(&rp->dev, "rpmsg_send failed: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static void rockchip_rpmsg_test_remove(struct rpmsg_device *rp)
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{
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dev_info(&rp->dev, "rockchip rpmsg test is removed\n");
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}
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static struct rpmsg_device_id rockchip_rpmsg_test_id_table[] = {
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{ .name = "rpmsg-ap3-ch0" },
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{ .name = "rpmsg-mcu0-test" },
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{ /* sentinel */ },
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};
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static struct rpmsg_driver rockchip_rpmsg_test = {
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.drv.name = KBUILD_MODNAME,
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.drv.owner = THIS_MODULE,
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.id_table = rockchip_rpmsg_test_id_table,
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.probe = rockchip_rpmsg_test_probe,
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.callback = rockchip_rpmsg_test_cb,
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.remove = rockchip_rpmsg_test_remove,
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};
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static int __init init(void)
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{
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return register_rpmsg_driver(&rockchip_rpmsg_test);
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}
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static void __exit fini(void)
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{
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unregister_rpmsg_driver(&rockchip_rpmsg_test);
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}
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module_init(init);
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module_exit(fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Rockchip Remote Processors Messaging Test");
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MODULE_AUTHOR("Hongming Zou <hongming.zou@rock-chips.com>");
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