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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2019 NXP
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/virtio.h>
#include <linux/rpmsg.h>
#define MSG "hello world!"
static int rpmsg_pingpong_cb(struct rpmsg_device *rpdev, void *data, int len,
void *priv, u32 src)
{
int err;
unsigned int rpmsg_pingpong;
/* reply */
rpmsg_pingpong = *(unsigned int *)data;
pr_info("get %d (src: 0x%x)\n", rpmsg_pingpong, src);
/* pingpongs should not live forever */
if (rpmsg_pingpong > 100) {
dev_info(&rpdev->dev, "goodbye!\n");
return 0;
}
rpmsg_pingpong++;
err = rpmsg_sendto(rpdev->ept, (void *)(&rpmsg_pingpong), 4, src);
if (err)
dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", err);
return err;
}
static int rpmsg_pingpong_probe(struct rpmsg_device *rpdev)
{
int err;
unsigned int rpmsg_pingpong;
dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
rpdev->src, rpdev->dst);
/*
* send a message to our remote processor, and tell remote
* processor about this channel
*/
err = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
if (err) {
dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", err);
return err;
}
rpmsg_pingpong = 0;
err = rpmsg_sendto(rpdev->ept, (void *)(&rpmsg_pingpong),
4, rpdev->dst);
if (err) {
dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", err);
return err;
}
return 0;
}
static void rpmsg_pingpong_remove(struct rpmsg_device *rpdev)
{
dev_info(&rpdev->dev, "rpmsg pingpong driver is removed\n");
}
static struct rpmsg_device_id rpmsg_driver_pingpong_id_table[] = {
{ .name = "rpmsg-openamp-demo-channel" },
{ .name = "rpmsg-openamp-demo-channel-1" },
{ },
};
static struct rpmsg_driver rpmsg_pingpong_driver = {
.drv.name = KBUILD_MODNAME,
.drv.owner = THIS_MODULE,
.id_table = rpmsg_driver_pingpong_id_table,
.probe = rpmsg_pingpong_probe,
.callback = rpmsg_pingpong_cb,
.remove = rpmsg_pingpong_remove,
};
static int __init init(void)
{
return register_rpmsg_driver(&rpmsg_pingpong_driver);
}
static void __exit fini(void)
{
unregister_rpmsg_driver(&rpmsg_pingpong_driver);
}
module_init(init);
module_exit(fini);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("iMX virtio remote processor messaging pingpong driver");
MODULE_LICENSE("GPL v2");
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