1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (c) 2014-2017, The Linux Foundation. All rights reserved.
15  * struct do_cleanup_msg - The data structure for an SSR do_cleanup message
16  * @version:	The G-Link SSR protocol version
17  * @command:	The G-Link SSR command - do_cleanup
20  * @name:	G-Link edge name of the subsystem being restarted
31  * struct cleanup_done_msg - The data structure for an SSR cleanup_done message
32  * @version:	The G-Link SSR protocol version
33  * @response:	The G-Link SSR response to a do_cleanup command, cleanup_done
43  * G-Link SSR protocol commands
62  * qcom_glink_ssr_notify() - notify GLINK SSR about stopped remoteproc
75 	struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev);  in qcom_glink_ssr_callback()
78 		dev_err(ssr->dev, "message too short\n");  in qcom_glink_ssr_callback()
79 		return -EINVAL;  in qcom_glink_ssr_callback()
82 	if (le32_to_cpu(msg->version) != 0)  in qcom_glink_ssr_callback()
83 		return -EINVAL;  in qcom_glink_ssr_callback()
85 	if (le32_to_cpu(msg->response) != GLINK_SSR_CLEANUP_DONE)  in qcom_glink_ssr_callback()
88 	if (le32_to_cpu(msg->seq_num) != ssr->seq_num) {  in qcom_glink_ssr_callback()
89 		dev_err(ssr->dev, "invalid sequence number of response\n");  in qcom_glink_ssr_callback()
90 		return -EINVAL;  in qcom_glink_ssr_callback()
93 	complete(&ssr->completion);  in qcom_glink_ssr_callback()
107 	ssr->seq_num++;  in qcom_glink_ssr_notifier_call()
108 	reinit_completion(&ssr->completion);  in qcom_glink_ssr_notifier_call()
112 	msg.seq_num = cpu_to_le32(ssr->seq_num);  in qcom_glink_ssr_notifier_call()
116 	ret = rpmsg_send(ssr->ept, &msg, sizeof(msg));  in qcom_glink_ssr_notifier_call()
118 		dev_err(ssr->dev, "failed to send cleanup message\n");  in qcom_glink_ssr_notifier_call()
120 	ret = wait_for_completion_timeout(&ssr->completion, HZ);  in qcom_glink_ssr_notifier_call()
122 		dev_err(ssr->dev, "timeout waiting for cleanup done message\n");  in qcom_glink_ssr_notifier_call()
131 	ssr = devm_kzalloc(&rpdev->dev, sizeof(*ssr), GFP_KERNEL);  in qcom_glink_ssr_probe()
133 		return -ENOMEM;  in qcom_glink_ssr_probe()
135 	init_completion(&ssr->completion);  in qcom_glink_ssr_probe()
137 	ssr->dev = &rpdev->dev;  in qcom_glink_ssr_probe()
138 	ssr->ept = rpdev->ept;  in qcom_glink_ssr_probe()
139 	ssr->nb.notifier_call = qcom_glink_ssr_notifier_call;  in qcom_glink_ssr_probe()
141 	dev_set_drvdata(&rpdev->dev, ssr);  in qcom_glink_ssr_probe()
143 	return blocking_notifier_chain_register(&ssr_notifiers, &ssr->nb);  in qcom_glink_ssr_probe()
148 	struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev);  in qcom_glink_ssr_remove()
150 	blocking_notifier_chain_unregister(&ssr_notifiers, &ssr->nb);  in qcom_glink_ssr_remove()