416 lines
10 KiB
C
416 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright 2019 Google LLC.
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/remoteproc.h>
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#include <linux/rpmsg/mtk_rpmsg.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include "rpmsg_internal.h"
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struct mtk_rpmsg_rproc_subdev {
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struct platform_device *pdev;
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struct mtk_rpmsg_info *info;
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struct rpmsg_endpoint *ns_ept;
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struct rproc_subdev subdev;
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struct work_struct register_work;
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struct list_head channels;
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struct mutex channels_lock;
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};
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#define to_mtk_subdev(d) container_of(d, struct mtk_rpmsg_rproc_subdev, subdev)
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struct mtk_rpmsg_channel_info {
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struct rpmsg_channel_info info;
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bool registered;
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struct list_head list;
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};
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/**
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* struct rpmsg_ns_msg - dynamic name service announcement message
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* @name: name of remote service that is published
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* @addr: address of remote service that is published
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*
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* This message is sent across to publish a new service. When we receive these
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* messages, an appropriate rpmsg channel (i.e device) is created. In turn, the
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* ->probe() handler of the appropriate rpmsg driver will be invoked
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* (if/as-soon-as one is registered).
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*/
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struct rpmsg_ns_msg {
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char name[RPMSG_NAME_SIZE];
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u32 addr;
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} __packed;
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struct mtk_rpmsg_device {
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struct rpmsg_device rpdev;
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struct mtk_rpmsg_rproc_subdev *mtk_subdev;
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};
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struct mtk_rpmsg_endpoint {
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struct rpmsg_endpoint ept;
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struct mtk_rpmsg_rproc_subdev *mtk_subdev;
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};
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#define to_mtk_rpmsg_device(r) container_of(r, struct mtk_rpmsg_device, rpdev)
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#define to_mtk_rpmsg_endpoint(r) container_of(r, struct mtk_rpmsg_endpoint, ept)
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static const struct rpmsg_endpoint_ops mtk_rpmsg_endpoint_ops;
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static void __mtk_ept_release(struct kref *kref)
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{
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struct rpmsg_endpoint *ept = container_of(kref, struct rpmsg_endpoint,
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refcount);
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kfree(to_mtk_rpmsg_endpoint(ept));
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}
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static void mtk_rpmsg_ipi_handler(void *data, unsigned int len, void *priv)
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{
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struct mtk_rpmsg_endpoint *mept = priv;
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struct rpmsg_endpoint *ept = &mept->ept;
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int ret;
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ret = (*ept->cb)(ept->rpdev, data, len, ept->priv, ept->addr);
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if (ret)
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dev_warn(&ept->rpdev->dev, "rpmsg handler return error = %d",
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ret);
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}
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static struct rpmsg_endpoint *
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__mtk_create_ept(struct mtk_rpmsg_rproc_subdev *mtk_subdev,
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struct rpmsg_device *rpdev, rpmsg_rx_cb_t cb, void *priv,
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u32 id)
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{
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struct mtk_rpmsg_endpoint *mept;
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struct rpmsg_endpoint *ept;
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struct platform_device *pdev = mtk_subdev->pdev;
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int ret;
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mept = kzalloc(sizeof(*mept), GFP_KERNEL);
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if (!mept)
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return NULL;
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mept->mtk_subdev = mtk_subdev;
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ept = &mept->ept;
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kref_init(&ept->refcount);
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ept->rpdev = rpdev;
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ept->cb = cb;
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ept->priv = priv;
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ept->ops = &mtk_rpmsg_endpoint_ops;
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ept->addr = id;
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ret = mtk_subdev->info->register_ipi(pdev, id, mtk_rpmsg_ipi_handler,
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mept);
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if (ret) {
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dev_err(&pdev->dev, "IPI register failed, id = %d", id);
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kref_put(&ept->refcount, __mtk_ept_release);
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return NULL;
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}
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return ept;
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}
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static struct rpmsg_endpoint *
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mtk_rpmsg_create_ept(struct rpmsg_device *rpdev, rpmsg_rx_cb_t cb, void *priv,
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struct rpmsg_channel_info chinfo)
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{
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struct mtk_rpmsg_rproc_subdev *mtk_subdev =
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to_mtk_rpmsg_device(rpdev)->mtk_subdev;
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return __mtk_create_ept(mtk_subdev, rpdev, cb, priv, chinfo.src);
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}
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static void mtk_rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
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{
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struct mtk_rpmsg_rproc_subdev *mtk_subdev =
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to_mtk_rpmsg_endpoint(ept)->mtk_subdev;
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mtk_subdev->info->unregister_ipi(mtk_subdev->pdev, ept->addr);
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kref_put(&ept->refcount, __mtk_ept_release);
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}
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static int mtk_rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
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{
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struct mtk_rpmsg_rproc_subdev *mtk_subdev =
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to_mtk_rpmsg_endpoint(ept)->mtk_subdev;
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return mtk_subdev->info->send_ipi(mtk_subdev->pdev, ept->addr, data,
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len, 0);
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}
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static int mtk_rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
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{
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struct mtk_rpmsg_rproc_subdev *mtk_subdev =
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to_mtk_rpmsg_endpoint(ept)->mtk_subdev;
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/*
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* TODO: This currently is same as mtk_rpmsg_send, and wait until SCP
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* received the last command.
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*/
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return mtk_subdev->info->send_ipi(mtk_subdev->pdev, ept->addr, data,
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len, 0);
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}
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static const struct rpmsg_endpoint_ops mtk_rpmsg_endpoint_ops = {
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.destroy_ept = mtk_rpmsg_destroy_ept,
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.send = mtk_rpmsg_send,
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.trysend = mtk_rpmsg_trysend,
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};
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static void mtk_rpmsg_release_device(struct device *dev)
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{
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struct rpmsg_device *rpdev = to_rpmsg_device(dev);
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struct mtk_rpmsg_device *mdev = to_mtk_rpmsg_device(rpdev);
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kfree(mdev);
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}
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static const struct rpmsg_device_ops mtk_rpmsg_device_ops = {
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.create_ept = mtk_rpmsg_create_ept,
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};
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static struct device_node *
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mtk_rpmsg_match_device_subnode(struct device_node *node, const char *channel)
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{
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struct device_node *child;
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const char *name;
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int ret;
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for_each_available_child_of_node(node, child) {
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ret = of_property_read_string(child, "mtk,rpmsg-name", &name);
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if (ret)
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continue;
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if (strcmp(name, channel) == 0)
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return child;
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}
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return NULL;
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}
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static int mtk_rpmsg_register_device(struct mtk_rpmsg_rproc_subdev *mtk_subdev,
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struct rpmsg_channel_info *info)
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{
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struct rpmsg_device *rpdev;
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struct mtk_rpmsg_device *mdev;
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struct platform_device *pdev = mtk_subdev->pdev;
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int ret;
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mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
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if (!mdev)
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return -ENOMEM;
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mdev->mtk_subdev = mtk_subdev;
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rpdev = &mdev->rpdev;
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rpdev->ops = &mtk_rpmsg_device_ops;
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rpdev->src = info->src;
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rpdev->dst = info->dst;
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strscpy(rpdev->id.name, info->name, RPMSG_NAME_SIZE);
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rpdev->dev.of_node =
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mtk_rpmsg_match_device_subnode(pdev->dev.of_node, info->name);
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rpdev->dev.parent = &pdev->dev;
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rpdev->dev.release = mtk_rpmsg_release_device;
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ret = rpmsg_register_device(rpdev);
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if (ret) {
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kfree(mdev);
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return ret;
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}
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return 0;
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}
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static void mtk_register_device_work_function(struct work_struct *register_work)
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{
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struct mtk_rpmsg_rproc_subdev *subdev = container_of(
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register_work, struct mtk_rpmsg_rproc_subdev, register_work);
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struct platform_device *pdev = subdev->pdev;
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struct mtk_rpmsg_channel_info *info;
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int ret;
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mutex_lock(&subdev->channels_lock);
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list_for_each_entry(info, &subdev->channels, list) {
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if (info->registered)
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continue;
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ret = mtk_rpmsg_register_device(subdev, &info->info);
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if (ret) {
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dev_err(&pdev->dev, "Can't create rpmsg_device\n");
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continue;
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}
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info->registered = true;
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}
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mutex_unlock(&subdev->channels_lock);
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}
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static int mtk_rpmsg_create_device(struct mtk_rpmsg_rproc_subdev *mtk_subdev,
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char *name, u32 addr)
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{
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struct mtk_rpmsg_channel_info *info;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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strscpy(info->info.name, name, RPMSG_NAME_SIZE);
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info->info.src = addr;
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info->info.dst = RPMSG_ADDR_ANY;
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mutex_lock(&mtk_subdev->channels_lock);
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list_add(&info->list, &mtk_subdev->channels);
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mutex_unlock(&mtk_subdev->channels_lock);
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schedule_work(&mtk_subdev->register_work);
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return 0;
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}
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static int mtk_rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len,
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void *priv, u32 src)
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{
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struct rpmsg_ns_msg *msg = data;
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struct mtk_rpmsg_rproc_subdev *mtk_subdev = priv;
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struct device *dev = &mtk_subdev->pdev->dev;
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int ret;
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if (len != sizeof(*msg)) {
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dev_err(dev, "malformed ns msg (%d)\n", len);
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return -EINVAL;
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}
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/*
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* the name service ept does _not_ belong to a real rpmsg channel,
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* and is handled by the rpmsg bus itself.
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* for sanity reasons, make sure a valid rpdev has _not_ sneaked
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* in somehow.
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*/
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if (rpdev) {
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dev_err(dev, "anomaly: ns ept has an rpdev handle\n");
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return -EINVAL;
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}
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/* don't trust the remote processor for null terminating the name */
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msg->name[RPMSG_NAME_SIZE - 1] = '\0';
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dev_info(dev, "creating channel %s addr 0x%x\n", msg->name, msg->addr);
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ret = mtk_rpmsg_create_device(mtk_subdev, msg->name, msg->addr);
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if (ret) {
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dev_err(dev, "create rpmsg device failed\n");
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return ret;
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}
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return 0;
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}
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static int mtk_rpmsg_prepare(struct rproc_subdev *subdev)
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{
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struct mtk_rpmsg_rproc_subdev *mtk_subdev = to_mtk_subdev(subdev);
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/* a dedicated endpoint handles the name service msgs */
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if (mtk_subdev->info->ns_ipi_id >= 0) {
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mtk_subdev->ns_ept =
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__mtk_create_ept(mtk_subdev, NULL, mtk_rpmsg_ns_cb,
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mtk_subdev,
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mtk_subdev->info->ns_ipi_id);
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if (!mtk_subdev->ns_ept) {
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dev_err(&mtk_subdev->pdev->dev,
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"failed to create name service endpoint\n");
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return -ENOMEM;
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}
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}
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return 0;
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}
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static void mtk_rpmsg_unprepare(struct rproc_subdev *subdev)
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{
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struct mtk_rpmsg_rproc_subdev *mtk_subdev = to_mtk_subdev(subdev);
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if (mtk_subdev->ns_ept) {
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mtk_rpmsg_destroy_ept(mtk_subdev->ns_ept);
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mtk_subdev->ns_ept = NULL;
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}
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}
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static void mtk_rpmsg_stop(struct rproc_subdev *subdev, bool crashed)
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{
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struct mtk_rpmsg_channel_info *info, *next;
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struct mtk_rpmsg_rproc_subdev *mtk_subdev = to_mtk_subdev(subdev);
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struct device *dev = &mtk_subdev->pdev->dev;
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/*
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* Destroy the name service endpoint here, to avoid new channel being
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* created after the rpmsg_unregister_device loop below.
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*/
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if (mtk_subdev->ns_ept) {
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mtk_rpmsg_destroy_ept(mtk_subdev->ns_ept);
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mtk_subdev->ns_ept = NULL;
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}
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cancel_work_sync(&mtk_subdev->register_work);
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mutex_lock(&mtk_subdev->channels_lock);
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list_for_each_entry(info, &mtk_subdev->channels, list) {
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if (!info->registered)
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continue;
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if (rpmsg_unregister_device(dev, &info->info)) {
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dev_warn(
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dev,
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"rpmsg_unregister_device failed for %s.%d.%d\n",
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info->info.name, info->info.src,
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info->info.dst);
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}
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}
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list_for_each_entry_safe(info, next,
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&mtk_subdev->channels, list) {
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list_del(&info->list);
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kfree(info);
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}
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mutex_unlock(&mtk_subdev->channels_lock);
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}
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struct rproc_subdev *
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mtk_rpmsg_create_rproc_subdev(struct platform_device *pdev,
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struct mtk_rpmsg_info *info)
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{
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struct mtk_rpmsg_rproc_subdev *mtk_subdev;
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mtk_subdev = kzalloc(sizeof(*mtk_subdev), GFP_KERNEL);
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if (!mtk_subdev)
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return NULL;
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mtk_subdev->pdev = pdev;
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mtk_subdev->subdev.prepare = mtk_rpmsg_prepare;
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mtk_subdev->subdev.stop = mtk_rpmsg_stop;
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mtk_subdev->subdev.unprepare = mtk_rpmsg_unprepare;
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mtk_subdev->info = info;
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INIT_LIST_HEAD(&mtk_subdev->channels);
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INIT_WORK(&mtk_subdev->register_work,
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mtk_register_device_work_function);
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mutex_init(&mtk_subdev->channels_lock);
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return &mtk_subdev->subdev;
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}
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EXPORT_SYMBOL_GPL(mtk_rpmsg_create_rproc_subdev);
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void mtk_rpmsg_destroy_rproc_subdev(struct rproc_subdev *subdev)
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{
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struct mtk_rpmsg_rproc_subdev *mtk_subdev = to_mtk_subdev(subdev);
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kfree(mtk_subdev);
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}
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EXPORT_SYMBOL_GPL(mtk_rpmsg_destroy_rproc_subdev);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("MediaTek scp rpmsg driver");
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