Commit | Line | Data |
---|---|---|
97fb5e8d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c4d77d5f BA |
2 | /* |
3 | * Copyright (c) 2014-2017, The Linux Foundation. All rights reserved. | |
4 | * Copyright (c) 2017, Linaro Ltd. | |
c4d77d5f BA |
5 | */ |
6 | ||
7 | #include <linux/completion.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/notifier.h> | |
10 | #include <linux/rpmsg.h> | |
11 | #include <linux/remoteproc/qcom_rproc.h> | |
12 | ||
13 | /** | |
14 | * struct do_cleanup_msg - The data structure for an SSR do_cleanup message | |
15 | * version: The G-Link SSR protocol version | |
16 | * command: The G-Link SSR command - do_cleanup | |
17 | * seq_num: Sequence number | |
18 | * name_len: Length of the name of the subsystem being restarted | |
19 | * name: G-Link edge name of the subsystem being restarted | |
20 | */ | |
21 | struct do_cleanup_msg { | |
22 | __le32 version; | |
23 | __le32 command; | |
24 | __le32 seq_num; | |
25 | __le32 name_len; | |
26 | char name[32]; | |
27 | }; | |
28 | ||
29 | /** | |
30 | * struct cleanup_done_msg - The data structure for an SSR cleanup_done message | |
31 | * version: The G-Link SSR protocol version | |
32 | * response: The G-Link SSR response to a do_cleanup command, cleanup_done | |
33 | * seq_num: Sequence number | |
34 | */ | |
35 | struct cleanup_done_msg { | |
36 | __le32 version; | |
37 | __le32 response; | |
38 | __le32 seq_num; | |
39 | }; | |
40 | ||
41 | /** | |
42 | * G-Link SSR protocol commands | |
43 | */ | |
44 | #define GLINK_SSR_DO_CLEANUP 0 | |
45 | #define GLINK_SSR_CLEANUP_DONE 1 | |
46 | ||
47 | struct glink_ssr { | |
48 | struct device *dev; | |
49 | struct rpmsg_endpoint *ept; | |
50 | ||
51 | struct notifier_block nb; | |
52 | ||
53 | u32 seq_num; | |
54 | struct completion completion; | |
55 | }; | |
56 | ||
57 | static int qcom_glink_ssr_callback(struct rpmsg_device *rpdev, | |
58 | void *data, int len, void *priv, u32 addr) | |
59 | { | |
60 | struct cleanup_done_msg *msg = data; | |
61 | struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev); | |
62 | ||
63 | if (len < sizeof(*msg)) { | |
64 | dev_err(ssr->dev, "message too short\n"); | |
65 | return -EINVAL; | |
66 | } | |
67 | ||
68 | if (le32_to_cpu(msg->version) != 0) | |
69 | return -EINVAL; | |
70 | ||
71 | if (le32_to_cpu(msg->response) != GLINK_SSR_CLEANUP_DONE) | |
72 | return 0; | |
73 | ||
74 | if (le32_to_cpu(msg->seq_num) != ssr->seq_num) { | |
75 | dev_err(ssr->dev, "invalid sequence number of response\n"); | |
76 | return -EINVAL; | |
77 | } | |
78 | ||
79 | complete(&ssr->completion); | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | static int qcom_glink_ssr_notify(struct notifier_block *nb, unsigned long event, | |
85 | void *data) | |
86 | { | |
87 | struct glink_ssr *ssr = container_of(nb, struct glink_ssr, nb); | |
88 | struct do_cleanup_msg msg; | |
89 | char *ssr_name = data; | |
90 | int ret; | |
91 | ||
92 | ssr->seq_num++; | |
93 | reinit_completion(&ssr->completion); | |
94 | ||
95 | memset(&msg, 0, sizeof(msg)); | |
96 | msg.command = cpu_to_le32(GLINK_SSR_DO_CLEANUP); | |
97 | msg.seq_num = cpu_to_le32(ssr->seq_num); | |
98 | msg.name_len = cpu_to_le32(strlen(ssr_name)); | |
99 | strlcpy(msg.name, ssr_name, sizeof(msg.name)); | |
100 | ||
101 | ret = rpmsg_send(ssr->ept, &msg, sizeof(msg)); | |
102 | if (ret < 0) | |
103 | dev_err(ssr->dev, "failed to send cleanup message\n"); | |
104 | ||
105 | ret = wait_for_completion_timeout(&ssr->completion, HZ); | |
106 | if (!ret) | |
107 | dev_err(ssr->dev, "timeout waiting for cleanup done message\n"); | |
108 | ||
109 | return NOTIFY_DONE; | |
110 | } | |
111 | ||
112 | static int qcom_glink_ssr_probe(struct rpmsg_device *rpdev) | |
113 | { | |
114 | struct glink_ssr *ssr; | |
115 | ||
116 | ssr = devm_kzalloc(&rpdev->dev, sizeof(*ssr), GFP_KERNEL); | |
117 | if (!ssr) | |
118 | return -ENOMEM; | |
119 | ||
120 | init_completion(&ssr->completion); | |
121 | ||
122 | ssr->dev = &rpdev->dev; | |
123 | ssr->ept = rpdev->ept; | |
124 | ssr->nb.notifier_call = qcom_glink_ssr_notify; | |
125 | ||
126 | dev_set_drvdata(&rpdev->dev, ssr); | |
127 | ||
128 | return qcom_register_ssr_notifier(&ssr->nb); | |
129 | } | |
130 | ||
131 | static void qcom_glink_ssr_remove(struct rpmsg_device *rpdev) | |
132 | { | |
133 | struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev); | |
134 | ||
135 | qcom_unregister_ssr_notifier(&ssr->nb); | |
136 | } | |
137 | ||
138 | static const struct rpmsg_device_id qcom_glink_ssr_match[] = { | |
139 | { "glink_ssr" }, | |
140 | {} | |
141 | }; | |
142 | ||
143 | static struct rpmsg_driver qcom_glink_ssr_driver = { | |
144 | .probe = qcom_glink_ssr_probe, | |
145 | .remove = qcom_glink_ssr_remove, | |
146 | .callback = qcom_glink_ssr_callback, | |
147 | .id_table = qcom_glink_ssr_match, | |
148 | .drv = { | |
149 | .name = "qcom_glink_ssr", | |
150 | }, | |
151 | }; | |
152 | module_rpmsg_driver(qcom_glink_ssr_driver); | |
153 | ||
154 | MODULE_ALIAS("rpmsg:glink_ssr"); | |
155 | MODULE_DESCRIPTION("Qualcomm GLINK SSR notifier"); | |
156 | MODULE_LICENSE("GPL v2"); |