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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) IoT.bzh 2021
*/
#include <linux/limits.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_reserved_mem.h>
#include <linux/pm_runtime.h>
#include <linux/remoteproc.h>
#include <linux/reset.h>
#include <linux/soc/renesas/rcar-rst.h>
#include "remoteproc_internal.h"
struct rcar_rproc {
struct reset_control *rst;
};
static int rcar_rproc_mem_alloc(struct rproc *rproc,
struct rproc_mem_entry *mem)
{
struct device *dev = &rproc->dev;
void *va;
dev_dbg(dev, "map memory: %pa+%zx\n", &mem->dma, mem->len);
va = ioremap_wc(mem->dma, mem->len);
if (!va) {
dev_err(dev, "Unable to map memory region: %pa+%zx\n",
&mem->dma, mem->len);
return -ENOMEM;
}
/* Update memory entry va */
mem->va = va;
return 0;
}
static int rcar_rproc_mem_release(struct rproc *rproc,
struct rproc_mem_entry *mem)
{
dev_dbg(&rproc->dev, "unmap memory: %pa\n", &mem->dma);
iounmap(mem->va);
return 0;
}
static int rcar_rproc_prepare(struct rproc *rproc)
{
struct device *dev = rproc->dev.parent;
struct device_node *np = dev->of_node;
struct of_phandle_iterator it;
struct rproc_mem_entry *mem;
struct reserved_mem *rmem;
u32 da;
/* Register associated reserved memory regions */
of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
while (of_phandle_iterator_next(&it) == 0) {
rmem = of_reserved_mem_lookup(it.node);
if (!rmem) {
of_node_put(it.node);
dev_err(&rproc->dev,
"unable to acquire memory-region\n");
return -EINVAL;
}
if (rmem->base > U32_MAX) {
of_node_put(it.node);
return -EINVAL;
}
/* No need to translate pa to da, R-Car use same map */
da = rmem->base;
mem = rproc_mem_entry_init(dev, NULL,
rmem->base,
rmem->size, da,
rcar_rproc_mem_alloc,
rcar_rproc_mem_release,
it.node->name);
if (!mem) {
of_node_put(it.node);
return -ENOMEM;
}
rproc_add_carveout(rproc, mem);
}
return 0;
}
static int rcar_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
{
int ret;
ret = rproc_elf_load_rsc_table(rproc, fw);
if (ret)
dev_info(&rproc->dev, "No resource table in elf\n");
return 0;
}
static int rcar_rproc_start(struct rproc *rproc)
{
struct rcar_rproc *priv = rproc->priv;
int err;
if (!rproc->bootaddr)
return -EINVAL;
err = rcar_rst_set_rproc_boot_addr(rproc->bootaddr);
if (err) {
dev_err(&rproc->dev, "failed to set rproc boot addr\n");
return err;
}
err = reset_control_deassert(priv->rst);
if (err)
dev_err(&rproc->dev, "failed to deassert reset\n");
return err;
}
static int rcar_rproc_stop(struct rproc *rproc)
{
struct rcar_rproc *priv = rproc->priv;
int err;
err = reset_control_assert(priv->rst);
if (err)
dev_err(&rproc->dev, "failed to assert reset\n");
return err;
}
static struct rproc_ops rcar_rproc_ops = {
.prepare = rcar_rproc_prepare,
.start = rcar_rproc_start,
.stop = rcar_rproc_stop,
.load = rproc_elf_load_segments,
.parse_fw = rcar_rproc_parse_fw,
.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
.sanity_check = rproc_elf_sanity_check,
.get_boot_addr = rproc_elf_get_boot_addr,
};
static int rcar_rproc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct rcar_rproc *priv;
struct rproc *rproc;
int ret;
rproc = devm_rproc_alloc(dev, np->name, &rcar_rproc_ops,
NULL, sizeof(*priv));
if (!rproc)
return -ENOMEM;
priv = rproc->priv;
priv->rst = devm_reset_control_get_exclusive(dev, NULL);
if (IS_ERR(priv->rst)) {
ret = PTR_ERR(priv->rst);
dev_err_probe(dev, ret, "fail to acquire rproc reset\n");
return ret;
}
pm_runtime_enable(dev);
ret = pm_runtime_resume_and_get(dev);
if (ret) {
dev_err(dev, "failed to power up\n");
return ret;
}
dev_set_drvdata(dev, rproc);
/* Manually start the rproc */
rproc->auto_boot = false;
ret = devm_rproc_add(dev, rproc);
if (ret) {
dev_err(dev, "rproc_add failed\n");
goto pm_disable;
}
return 0;
pm_disable:
pm_runtime_disable(dev);
return ret;
}
static int rcar_rproc_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
pm_runtime_disable(dev);
return 0;
}
static const struct of_device_id rcar_rproc_of_match[] = {
{ .compatible = "renesas,rcar-cr7" },
{},
};
MODULE_DEVICE_TABLE(of, rcar_rproc_of_match);
static struct platform_driver rcar_rproc_driver = {
.probe = rcar_rproc_probe,
.remove = rcar_rproc_remove,
.driver = {
.name = "rcar-rproc",
.of_match_table = rcar_rproc_of_match,
},
};
module_platform_driver(rcar_rproc_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Renesas R-Car Gen3 remote processor control driver");
MODULE_AUTHOR("Julien Massot <julien.massot@iot.bzh>");
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