/*
* Qualcomm Peripheral Image Loader helpers
*
* Copyright (C) 2016 Linaro Ltd
* Copyright (C) 2015 Sony Mobile Communications Inc
* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* 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.
*/
#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/remoteproc.h>
#include <linux/rpmsg/qcom_smd.h>
#include "remoteproc_internal.h"
#include "qcom_common.h"
#define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev)
#define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev)
BLOCKING_NOTIFIER_HEAD(ssr_notifiers);
/**
* qcom_mdt_find_rsc_table() - provide dummy resource table for remoteproc
* @rproc: remoteproc handle
* @fw: firmware header
* @tablesz: outgoing size of the table
*
* Returns a dummy table.
*/
struct resource_table *qcom_mdt_find_rsc_table(struct rproc *rproc,
const struct firmware *fw,
int *tablesz)
{
static struct resource_table table = { .ver = 1, };
*tablesz = sizeof(table);
return &table;
}
EXPORT_SYMBOL_GPL(qcom_mdt_find_rsc_table);
static int smd_subdev_probe(struct rproc_subdev *subdev)
{
struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
smd->edge = qcom_smd_register_edge(smd->dev, smd->node);
return PTR_ERR_OR_ZERO(smd->edge);
}
static void smd_subdev_remove(struct rproc_subdev *subdev)
{
struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
qcom_smd_unregister_edge(smd->edge);
smd->edge = NULL;
}
/**
* qcom_add_smd_subdev() - try to add a SMD subdevice to rproc
* @rproc: rproc handle to parent the subdevice
* @smd: reference to a Qualcomm subdev context
*/
void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
{
struct device *dev = &rproc->dev;
smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge");
if (!smd->node)
return;
smd->dev = dev;
rproc_add_subdev(rproc, &smd->subdev, smd_subdev_probe, smd_subdev_remove);
}
EXPORT_SYMBOL_GPL(qcom_add_smd_subdev);
/**
* qcom_remove_smd_subdev() - remove the smd subdevice from rproc
* @rproc: rproc handle
* @smd: the SMD subdevice to remove
*/
void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
{
rproc_remove_subdev(rproc, &smd->subdev);
of_node_put(smd->node);
}
EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);
/**
* qcom_register_ssr_notifier() - register SSR notification handler
* @nb: notifier_block to notify for restart notifications
*
* Returns 0 on success, negative errno on failure.
*
* This register the @notify function as handler for restart notifications. As
* remote processors are stopped this function will be called, with the SSR
* name passed as a parameter.
*/
int qcom_register_ssr_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&ssr_notifiers, nb);
}
EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);
/**
* qcom_unregister_ssr_notifier() - unregister SSR notification handler
* @nb: notifier_block to unregister
*/
void qcom_unregister_ssr_notifier(struct notifier_block *nb)
{
blocking_notifier_chain_unregister(&ssr_notifiers, nb);
}
EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
static int ssr_notify_start(struct rproc_subdev *subdev)
{
return 0;
}
static void ssr_notify_stop(struct rproc_subdev *subdev)
{
struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
blocking_notifier_call_chain(&ssr_notifiers, 0, (void *)ssr->name);
}
/**
* qcom_add_ssr_subdev() - register subdevice as restart notification source
* @rproc: rproc handle
* @ssr: SSR subdevice handle
* @ssr_name: identifier to use for notifications originating from @rproc
*
* As the @ssr is registered with the @rproc SSR events will be sent to all
* registered listeners in the system as the remoteproc is shut down.
*/
void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
const char *ssr_name)
{
ssr->name = ssr_name;
rproc_add_subdev(rproc, &ssr->subdev, ssr_notify_start, ssr_notify_stop);
}
EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev);
/**
* qcom_remove_ssr_subdev() - remove subdevice as restart notification source
* @rproc: rproc handle
* @ssr: SSR subdevice handle
*/
void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
{
rproc_remove_subdev(rproc, &ssr->subdev);
}
EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
MODULE_LICENSE("GPL v2");
