Eric Lee / smarc-fsl-linux-kernel

Blame view

drivers/rpmsg/imx_rpmsg_pingpong.c 2.65 KB
edit raw normal view history
81f7e3824   Eric Lee   Initial Release, ... 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
 
  /*
   * Copyright (C) 2015 Freescale Semiconductor, Inc.
   *
   * derived from the omap-rpmsg implementation.
   * Remote processor messaging transport - pingpong driver
   *
   * The code contained herein is licensed under the GNU General Public
   * License. You may obtain a copy of the GNU General Public License
   * Version 2 or later at the following locations:
   *
   * http://www.opensource.org/licenses/gpl-license.html
   * http://www.gnu.org/copyleft/gpl.html
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/virtio.h>
  #include <linux/rpmsg.h>
  
  #define MSG		"hello world!"
  static unsigned int rpmsg_pingpong;
  
  static int rpmsg_pingpong_cb(struct rpmsg_device *rpdev, void *data, int len,
  						void *priv, u32 src)
  {
  	int err;
  
  	/* reply */
  	rpmsg_pingpong = *(unsigned int *)data;
  	pr_info("get %d (src: 0x%x)
  ", rpmsg_pingpong, src);
  
  	/* pingpongs should not live forever */
  	if (rpmsg_pingpong > 100) {
  		dev_info(&rpdev->dev, "goodbye!
  ");
  		return 0;
  	}
  	rpmsg_pingpong++;
  	err = rpmsg_sendto(rpdev->ept, (void *)(&rpmsg_pingpong), 4, src);
  
  	if (err)
  		dev_err(&rpdev->dev, "rpmsg_send failed: %d
  ", err);
  
  	return err;
  }
  
  static int rpmsg_pingpong_probe(struct rpmsg_device *rpdev)
  {
  	int err;
  
  	dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!
  ",
  			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
  ", 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
  ", err);
  		return err;
  	}
  
  	return 0;
  }
  
  static void rpmsg_pingpong_remove(struct rpmsg_device *rpdev)
  {
  	dev_info(&rpdev->dev, "rpmsg pingpong driver is removed
  ");
  }
  
  static struct rpmsg_device_id rpmsg_driver_pingpong_id_table[] = {
  	{ .name	= "rpmsg-openamp-demo-channel" },
  	{ .name	= "rpmsg-openamp-demo-channel-1" },
  	{ },
  };
  MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_pingpong_id_table);
  
  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");