97fb5e8d9b
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 and only version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 294 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141900.825281744@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2014-2017, The Linux Foundation. All rights reserved.
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* Copyright (c) 2017, Linaro Ltd.
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*/
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#include <linux/completion.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/rpmsg.h>
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#include <linux/remoteproc/qcom_rproc.h>
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/**
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* struct do_cleanup_msg - The data structure for an SSR do_cleanup message
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* version: The G-Link SSR protocol version
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* command: The G-Link SSR command - do_cleanup
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* seq_num: Sequence number
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* name_len: Length of the name of the subsystem being restarted
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* name: G-Link edge name of the subsystem being restarted
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*/
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struct do_cleanup_msg {
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__le32 version;
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__le32 command;
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__le32 seq_num;
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__le32 name_len;
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char name[32];
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};
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/**
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* struct cleanup_done_msg - The data structure for an SSR cleanup_done message
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* version: The G-Link SSR protocol version
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* response: The G-Link SSR response to a do_cleanup command, cleanup_done
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* seq_num: Sequence number
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*/
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struct cleanup_done_msg {
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__le32 version;
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__le32 response;
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__le32 seq_num;
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};
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/**
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* G-Link SSR protocol commands
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*/
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#define GLINK_SSR_DO_CLEANUP 0
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#define GLINK_SSR_CLEANUP_DONE 1
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struct glink_ssr {
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struct device *dev;
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struct rpmsg_endpoint *ept;
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struct notifier_block nb;
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u32 seq_num;
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struct completion completion;
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};
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static int qcom_glink_ssr_callback(struct rpmsg_device *rpdev,
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void *data, int len, void *priv, u32 addr)
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{
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struct cleanup_done_msg *msg = data;
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struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev);
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if (len < sizeof(*msg)) {
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dev_err(ssr->dev, "message too short\n");
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return -EINVAL;
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}
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if (le32_to_cpu(msg->version) != 0)
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return -EINVAL;
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if (le32_to_cpu(msg->response) != GLINK_SSR_CLEANUP_DONE)
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return 0;
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if (le32_to_cpu(msg->seq_num) != ssr->seq_num) {
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dev_err(ssr->dev, "invalid sequence number of response\n");
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return -EINVAL;
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}
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complete(&ssr->completion);
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return 0;
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}
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static int qcom_glink_ssr_notify(struct notifier_block *nb, unsigned long event,
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void *data)
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{
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struct glink_ssr *ssr = container_of(nb, struct glink_ssr, nb);
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struct do_cleanup_msg msg;
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char *ssr_name = data;
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int ret;
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ssr->seq_num++;
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reinit_completion(&ssr->completion);
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memset(&msg, 0, sizeof(msg));
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msg.command = cpu_to_le32(GLINK_SSR_DO_CLEANUP);
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msg.seq_num = cpu_to_le32(ssr->seq_num);
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msg.name_len = cpu_to_le32(strlen(ssr_name));
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strlcpy(msg.name, ssr_name, sizeof(msg.name));
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ret = rpmsg_send(ssr->ept, &msg, sizeof(msg));
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if (ret < 0)
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dev_err(ssr->dev, "failed to send cleanup message\n");
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ret = wait_for_completion_timeout(&ssr->completion, HZ);
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if (!ret)
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dev_err(ssr->dev, "timeout waiting for cleanup done message\n");
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return NOTIFY_DONE;
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}
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static int qcom_glink_ssr_probe(struct rpmsg_device *rpdev)
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{
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struct glink_ssr *ssr;
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ssr = devm_kzalloc(&rpdev->dev, sizeof(*ssr), GFP_KERNEL);
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if (!ssr)
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return -ENOMEM;
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init_completion(&ssr->completion);
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ssr->dev = &rpdev->dev;
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ssr->ept = rpdev->ept;
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ssr->nb.notifier_call = qcom_glink_ssr_notify;
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dev_set_drvdata(&rpdev->dev, ssr);
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return qcom_register_ssr_notifier(&ssr->nb);
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}
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static void qcom_glink_ssr_remove(struct rpmsg_device *rpdev)
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{
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struct glink_ssr *ssr = dev_get_drvdata(&rpdev->dev);
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qcom_unregister_ssr_notifier(&ssr->nb);
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}
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static const struct rpmsg_device_id qcom_glink_ssr_match[] = {
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{ "glink_ssr" },
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{}
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};
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static struct rpmsg_driver qcom_glink_ssr_driver = {
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.probe = qcom_glink_ssr_probe,
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.remove = qcom_glink_ssr_remove,
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.callback = qcom_glink_ssr_callback,
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.id_table = qcom_glink_ssr_match,
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.drv = {
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.name = "qcom_glink_ssr",
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},
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};
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module_rpmsg_driver(qcom_glink_ssr_driver);
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MODULE_ALIAS("rpmsg:glink_ssr");
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MODULE_DESCRIPTION("Qualcomm GLINK SSR notifier");
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MODULE_LICENSE("GPL v2");
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