Commit 285892a7 authored by Julien Massot's avatar Julien Massot Committed by Mathieu Poirier

remoteproc: Add Renesas rcar driver

Renesas Gen3 platform includes a Cortex-r7 processor.

Both: the application cores (A5x) and the realtime core (CR7)
share access to the RAM and devices with the same address map,
so device addresses are equal to the Linux physical addresses.

In order to initialize this remote processor we need to:
- power on the realtime core
- put the firmware in a RAM area
- set the boot address for this firmware (reset vector)
- Deassert the reset

This initial driver allows to start and stop the Cortex R7
processor.
Signed-off-by: default avatarJulien Massot <julien.massot@iot.bzh>
Link: https://lore.kernel.org/r/20211207165829.195537-3-julien.massot@iot.bzhSigned-off-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
parent d3c76a42
...@@ -283,6 +283,17 @@ config QCOM_WCNSS_PIL ...@@ -283,6 +283,17 @@ config QCOM_WCNSS_PIL
verified and booted with the help of the Peripheral Authentication verified and booted with the help of the Peripheral Authentication
System (PAS) in TrustZone. System (PAS) in TrustZone.
config RCAR_REMOTEPROC
tristate "Renesas R-Car Gen3 remoteproc support"
depends on ARCH_RENESAS || COMPILE_TEST
help
Say y here to support R-Car realtime processor via the
remote processor framework. An ELF firmware can be loaded
thanks to sysfs remoteproc entries. The remote processor
can be started and stopped.
This can be either built-in or a loadable module.
If compiled as module (M), the module name is rcar_rproc.
config ST_REMOTEPROC config ST_REMOTEPROC
tristate "ST remoteproc support" tristate "ST remoteproc support"
depends on ARCH_STI depends on ARCH_STI
......
...@@ -32,6 +32,7 @@ obj-$(CONFIG_QCOM_SYSMON) += qcom_sysmon.o ...@@ -32,6 +32,7 @@ obj-$(CONFIG_QCOM_SYSMON) += qcom_sysmon.o
obj-$(CONFIG_QCOM_WCNSS_PIL) += qcom_wcnss_pil.o obj-$(CONFIG_QCOM_WCNSS_PIL) += qcom_wcnss_pil.o
qcom_wcnss_pil-y += qcom_wcnss.o qcom_wcnss_pil-y += qcom_wcnss.o
qcom_wcnss_pil-y += qcom_wcnss_iris.o qcom_wcnss_pil-y += qcom_wcnss_iris.o
obj-$(CONFIG_RCAR_REMOTEPROC) += rcar_rproc.o
obj-$(CONFIG_ST_REMOTEPROC) += st_remoteproc.o obj-$(CONFIG_ST_REMOTEPROC) += st_remoteproc.o
obj-$(CONFIG_ST_SLIM_REMOTEPROC) += st_slim_rproc.o obj-$(CONFIG_ST_SLIM_REMOTEPROC) += st_slim_rproc.o
obj-$(CONFIG_STM32_RPROC) += stm32_rproc.o obj-$(CONFIG_STM32_RPROC) += stm32_rproc.o
......
// 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) {
dev_err(&rproc->dev,
"unable to acquire memory-region\n");
return -EINVAL;
}
if (rmem->base > U32_MAX)
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)
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_get_sync(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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