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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> | |
3e35772b | 11 | #include <linux/rpmsg/qcom_glink.h> |
c4d77d5f BA |
12 | #include <linux/remoteproc/qcom_rproc.h> |
13 | ||
14 | /** | |
15 | * struct do_cleanup_msg - The data structure for an SSR do_cleanup message | |
df2f392c AE |
16 | * @version: The G-Link SSR protocol version |
17 | * @command: The G-Link SSR command - do_cleanup | |
18 | * @seq_num: Sequence number | |
19 | * @name_len: Length of the name of the subsystem being restarted | |
20 | * @name: G-Link edge name of the subsystem being restarted | |
c4d77d5f BA |
21 | */ |
22 | struct do_cleanup_msg { | |
23 | __le32 version; | |
24 | __le32 command; | |
25 | __le32 seq_num; | |
26 | __le32 name_len; | |
27 | char name[32]; | |
28 | }; | |
29 | ||
30 | /** | |
31 | * struct cleanup_done_msg - The data structure for an SSR cleanup_done message | |
df2f392c AE |
32 | * @version: The G-Link SSR protocol version |
33 | * @response: The G-Link SSR response to a do_cleanup command, cleanup_done | |
34 | * @seq_num: Sequence number | |
c4d77d5f BA |
35 | */ |
36 | struct cleanup_done_msg { | |
37 | __le32 version; | |
38 | __le32 response; | |
39 | __le32 seq_num; | |
40 | }; | |
41 | ||
101042f4 | 42 | /* |
c4d77d5f BA |
43 | * G-Link SSR protocol commands |
44 | */ | |
45 | #define GLINK_SSR_DO_CLEANUP 0 | |
46 | #define GLINK_SSR_CLEANUP_DONE 1 | |
47 | ||
48 | struct glink_ssr { | |
49 | struct device *dev; | |
50 | struct rpmsg_endpoint *ept; | |
51 | ||
52 | struct notifier_block nb; | |
53 | ||
54 | u32 seq_num; | |
55 | struct completion completion; | |
56 | }; | |
57 | ||
5d1f2e3c BA |
58 | /* Notifier list for all registered glink_ssr instances */ |
59 | static BLOCKING_NOTIFIER_HEAD(ssr_notifiers); | |
60 | ||
61 | /** | |
62 | * qcom_glink_ssr_notify() - notify GLINK SSR about stopped remoteproc | |
63 | * @ssr_name: name of the remoteproc that has been stopped | |
64 | */ | |
65 | void qcom_glink_ssr_notify(const char *ssr_name) | |
66 | { | |
67 | blocking_notifier_call_chain(&ssr_notifiers, 0, (void *)ssr_name); | |
68 | } | |
69 | EXPORT_SYMBOL_GPL(qcom_glink_ssr_notify); | |
70 | ||
c4d77d5f BA |
71 | static int qcom_glink_ssr_callback(struct rpmsg_device *rpdev, |
72 | void *data, int len, void *priv, u32 addr) | |
73 | { | |
74 | struct cleanup_done_msg *msg = data; | |
75 | struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev); | |
76 | ||
77 | if (len < sizeof(*msg)) { | |
78 | dev_err(ssr->dev, "message too short\n"); | |
79 | return -EINVAL; | |
80 | } | |
81 | ||
82 | if (le32_to_cpu(msg->version) != 0) | |
83 | return -EINVAL; | |
84 | ||
85 | if (le32_to_cpu(msg->response) != GLINK_SSR_CLEANUP_DONE) | |
86 | return 0; | |
87 | ||
88 | if (le32_to_cpu(msg->seq_num) != ssr->seq_num) { | |
89 | dev_err(ssr->dev, "invalid sequence number of response\n"); | |
90 | return -EINVAL; | |
91 | } | |
92 | ||
93 | complete(&ssr->completion); | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
5d1f2e3c BA |
98 | static int qcom_glink_ssr_notifier_call(struct notifier_block *nb, |
99 | unsigned long event, | |
100 | void *data) | |
c4d77d5f BA |
101 | { |
102 | struct glink_ssr *ssr = container_of(nb, struct glink_ssr, nb); | |
103 | struct do_cleanup_msg msg; | |
104 | char *ssr_name = data; | |
105 | int ret; | |
106 | ||
107 | ssr->seq_num++; | |
108 | reinit_completion(&ssr->completion); | |
109 | ||
110 | memset(&msg, 0, sizeof(msg)); | |
111 | msg.command = cpu_to_le32(GLINK_SSR_DO_CLEANUP); | |
112 | msg.seq_num = cpu_to_le32(ssr->seq_num); | |
113 | msg.name_len = cpu_to_le32(strlen(ssr_name)); | |
d2ff0f84 | 114 | strscpy(msg.name, ssr_name, sizeof(msg.name)); |
c4d77d5f BA |
115 | |
116 | ret = rpmsg_send(ssr->ept, &msg, sizeof(msg)); | |
117 | if (ret < 0) | |
118 | dev_err(ssr->dev, "failed to send cleanup message\n"); | |
119 | ||
120 | ret = wait_for_completion_timeout(&ssr->completion, HZ); | |
121 | if (!ret) | |
122 | dev_err(ssr->dev, "timeout waiting for cleanup done message\n"); | |
123 | ||
124 | return NOTIFY_DONE; | |
125 | } | |
126 | ||
127 | static int qcom_glink_ssr_probe(struct rpmsg_device *rpdev) | |
128 | { | |
129 | struct glink_ssr *ssr; | |
130 | ||
131 | ssr = devm_kzalloc(&rpdev->dev, sizeof(*ssr), GFP_KERNEL); | |
132 | if (!ssr) | |
133 | return -ENOMEM; | |
134 | ||
135 | init_completion(&ssr->completion); | |
136 | ||
137 | ssr->dev = &rpdev->dev; | |
138 | ssr->ept = rpdev->ept; | |
5d1f2e3c | 139 | ssr->nb.notifier_call = qcom_glink_ssr_notifier_call; |
c4d77d5f BA |
140 | |
141 | dev_set_drvdata(&rpdev->dev, ssr); | |
142 | ||
5d1f2e3c | 143 | return blocking_notifier_chain_register(&ssr_notifiers, &ssr->nb); |
c4d77d5f BA |
144 | } |
145 | ||
146 | static void qcom_glink_ssr_remove(struct rpmsg_device *rpdev) | |
147 | { | |
148 | struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev); | |
149 | ||
5d1f2e3c | 150 | blocking_notifier_chain_unregister(&ssr_notifiers, &ssr->nb); |
c4d77d5f BA |
151 | } |
152 | ||
153 | static const struct rpmsg_device_id qcom_glink_ssr_match[] = { | |
154 | { "glink_ssr" }, | |
155 | {} | |
156 | }; | |
157 | ||
158 | static struct rpmsg_driver qcom_glink_ssr_driver = { | |
159 | .probe = qcom_glink_ssr_probe, | |
160 | .remove = qcom_glink_ssr_remove, | |
161 | .callback = qcom_glink_ssr_callback, | |
162 | .id_table = qcom_glink_ssr_match, | |
163 | .drv = { | |
164 | .name = "qcom_glink_ssr", | |
165 | }, | |
166 | }; | |
167 | module_rpmsg_driver(qcom_glink_ssr_driver); |