165 lines
4.1 KiB
C
165 lines
4.1 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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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