// SPDX-License-Identifier: GPL-2.0-only
/*
* 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.
*/
#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/remoteproc.h>
#include <linux/rpmsg/qcom_glink.h>
#include <linux/rpmsg/qcom_smd.h>
#include <linux/soc/qcom/mdt_loader.h>
#include "remoteproc_internal.h"
#include "qcom_common.h"
#define to_glink_subdev(d) container_of(d, struct qcom_rproc_glink, subdev)
#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)
static BLOCKING_NOTIFIER_HEAD(ssr_notifiers);
static int glink_subdev_start(struct rproc_subdev *subdev)
{
struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
glink->edge = qcom_glink_smem_register(glink->dev, glink->node);
return PTR_ERR_OR_ZERO(glink->edge);
}
static void glink_subdev_stop(struct rproc_subdev *subdev, bool crashed)
{
struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
qcom_glink_smem_unregister(glink->edge);
glink->edge = NULL;
}
/**
* qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc
* @rproc: rproc handle to parent the subdevice
* @glink: reference to a GLINK subdev context
*/
void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
{
struct device *dev = &rproc->dev;
glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge");
if (!glink->node)
return;
glink->dev = dev;
glink->subdev.start = glink_subdev_start;
glink->subdev.stop = glink_subdev_stop;
rproc_add_subdev(rproc, &glink->subdev);
}
EXPORT_SYMBOL_GPL(qcom_add_glink_subdev);
/**
* qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc
* @rproc: rproc handle
* @glink: reference to a GLINK subdev context
*/
void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
{
if (!glink->node)
return;
rproc_remove_subdev(rproc, &glink->subdev);
of_node_put(glink->node);
}
EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);
/**
* qcom_register_dump_segments() - register segments for coredump
* @rproc: remoteproc handle
* @fw: firmware header
*
* Register all segments of the ELF in the remoteproc coredump segment list
*
* Return: 0 on success, negative errno on failure.
*/
int qcom_register_dump_segments(struct rproc *rproc,
const struct firmware *fw)
{
const struct elf32_phdr *phdrs;
const struct elf32_phdr *phdr;
const struct elf32_hdr *ehdr;
int ret;
int i;
ehdr = (struct elf32_hdr *)fw->data;
phdrs = (struct elf32_phdr *)(ehdr + 1);
for (i = 0; i < ehdr->e_phnum; i++) {
phdr = &phdrs[i];
if (phdr->p_type != PT_LOAD)
continue;
if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
continue;
if (!phdr->p_memsz)
continue;
ret = rproc_coredump_add_segment(rproc, phdr->p_paddr,
phdr->p_memsz);
if (ret)
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(qcom_register_dump_segments);
static int smd_subdev_start(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_stop(struct rproc_subdev *subdev, bool crashed)
{
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;
smd->subdev.start = smd_subdev_start;
smd->subdev.stop = smd_subdev_stop;
rproc_add_subdev(rproc, &smd->subdev);
}
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)
{
if (!smd->node)
return;
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 void ssr_notify_unprepare(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;
ssr->subdev.unprepare = ssr_notify_unprepare;
rproc_add_subdev(rproc, &ssr->subdev);
}
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");
