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1 | /* |
2 | * Copyright (c) 2014-2017, The Linux Foundation. All rights reserved. | |
3 | * Copyright (c) 2017, Linaro Ltd. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 and | |
7 | * only version 2 as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/completion.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/notifier.h> | |
18 | #include <linux/rpmsg.h> | |
19 | #include <linux/remoteproc/qcom_rproc.h> | |
20 | ||
21 | /** | |
22 | * struct do_cleanup_msg - The data structure for an SSR do_cleanup message | |
23 | * version: The G-Link SSR protocol version | |
24 | * command: The G-Link SSR command - do_cleanup | |
25 | * seq_num: Sequence number | |
26 | * name_len: Length of the name of the subsystem being restarted | |
27 | * name: G-Link edge name of the subsystem being restarted | |
28 | */ | |
29 | struct do_cleanup_msg { | |
30 | __le32 version; | |
31 | __le32 command; | |
32 | __le32 seq_num; | |
33 | __le32 name_len; | |
34 | char name[32]; | |
35 | }; | |
36 | ||
37 | /** | |
38 | * struct cleanup_done_msg - The data structure for an SSR cleanup_done message | |
39 | * version: The G-Link SSR protocol version | |
40 | * response: The G-Link SSR response to a do_cleanup command, cleanup_done | |
41 | * seq_num: Sequence number | |
42 | */ | |
43 | struct cleanup_done_msg { | |
44 | __le32 version; | |
45 | __le32 response; | |
46 | __le32 seq_num; | |
47 | }; | |
48 | ||
49 | /** | |
50 | * G-Link SSR protocol commands | |
51 | */ | |
52 | #define GLINK_SSR_DO_CLEANUP 0 | |
53 | #define GLINK_SSR_CLEANUP_DONE 1 | |
54 | ||
55 | struct glink_ssr { | |
56 | struct device *dev; | |
57 | struct rpmsg_endpoint *ept; | |
58 | ||
59 | struct notifier_block nb; | |
60 | ||
61 | u32 seq_num; | |
62 | struct completion completion; | |
63 | }; | |
64 | ||
65 | static int qcom_glink_ssr_callback(struct rpmsg_device *rpdev, | |
66 | void *data, int len, void *priv, u32 addr) | |
67 | { | |
68 | struct cleanup_done_msg *msg = data; | |
69 | struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev); | |
70 | ||
71 | if (len < sizeof(*msg)) { | |
72 | dev_err(ssr->dev, "message too short\n"); | |
73 | return -EINVAL; | |
74 | } | |
75 | ||
76 | if (le32_to_cpu(msg->version) != 0) | |
77 | return -EINVAL; | |
78 | ||
79 | if (le32_to_cpu(msg->response) != GLINK_SSR_CLEANUP_DONE) | |
80 | return 0; | |
81 | ||
82 | if (le32_to_cpu(msg->seq_num) != ssr->seq_num) { | |
83 | dev_err(ssr->dev, "invalid sequence number of response\n"); | |
84 | return -EINVAL; | |
85 | } | |
86 | ||
87 | complete(&ssr->completion); | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | static int qcom_glink_ssr_notify(struct notifier_block *nb, unsigned long event, | |
93 | void *data) | |
94 | { | |
95 | struct glink_ssr *ssr = container_of(nb, struct glink_ssr, nb); | |
96 | struct do_cleanup_msg msg; | |
97 | char *ssr_name = data; | |
98 | int ret; | |
99 | ||
100 | ssr->seq_num++; | |
101 | reinit_completion(&ssr->completion); | |
102 | ||
103 | memset(&msg, 0, sizeof(msg)); | |
104 | msg.command = cpu_to_le32(GLINK_SSR_DO_CLEANUP); | |
105 | msg.seq_num = cpu_to_le32(ssr->seq_num); | |
106 | msg.name_len = cpu_to_le32(strlen(ssr_name)); | |
107 | strlcpy(msg.name, ssr_name, sizeof(msg.name)); | |
108 | ||
109 | ret = rpmsg_send(ssr->ept, &msg, sizeof(msg)); | |
110 | if (ret < 0) | |
111 | dev_err(ssr->dev, "failed to send cleanup message\n"); | |
112 | ||
113 | ret = wait_for_completion_timeout(&ssr->completion, HZ); | |
114 | if (!ret) | |
115 | dev_err(ssr->dev, "timeout waiting for cleanup done message\n"); | |
116 | ||
117 | return NOTIFY_DONE; | |
118 | } | |
119 | ||
120 | static int qcom_glink_ssr_probe(struct rpmsg_device *rpdev) | |
121 | { | |
122 | struct glink_ssr *ssr; | |
123 | ||
124 | ssr = devm_kzalloc(&rpdev->dev, sizeof(*ssr), GFP_KERNEL); | |
125 | if (!ssr) | |
126 | return -ENOMEM; | |
127 | ||
128 | init_completion(&ssr->completion); | |
129 | ||
130 | ssr->dev = &rpdev->dev; | |
131 | ssr->ept = rpdev->ept; | |
132 | ssr->nb.notifier_call = qcom_glink_ssr_notify; | |
133 | ||
134 | dev_set_drvdata(&rpdev->dev, ssr); | |
135 | ||
136 | return qcom_register_ssr_notifier(&ssr->nb); | |
137 | } | |
138 | ||
139 | static void qcom_glink_ssr_remove(struct rpmsg_device *rpdev) | |
140 | { | |
141 | struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev); | |
142 | ||
143 | qcom_unregister_ssr_notifier(&ssr->nb); | |
144 | } | |
145 | ||
146 | static const struct rpmsg_device_id qcom_glink_ssr_match[] = { | |
147 | { "glink_ssr" }, | |
148 | {} | |
149 | }; | |
150 | ||
151 | static struct rpmsg_driver qcom_glink_ssr_driver = { | |
152 | .probe = qcom_glink_ssr_probe, | |
153 | .remove = qcom_glink_ssr_remove, | |
154 | .callback = qcom_glink_ssr_callback, | |
155 | .id_table = qcom_glink_ssr_match, | |
156 | .drv = { | |
157 | .name = "qcom_glink_ssr", | |
158 | }, | |
159 | }; | |
160 | module_rpmsg_driver(qcom_glink_ssr_driver); | |
161 | ||
162 | MODULE_ALIAS("rpmsg:glink_ssr"); | |
163 | MODULE_DESCRIPTION("Qualcomm GLINK SSR notifier"); | |
164 | MODULE_LICENSE("GPL v2"); |