Commit be06f8e7 authored by Georgi Djakov's avatar Georgi Djakov

interconnect: qcom: Add interconnect RPM over SMD driver

On some Qualcomm SoCs, there is a remote processor, which controls some of
the Network-On-Chip interconnect resources. Other CPUs express their needs
by communicating with this processor. Add a driver to handle communication
with this remote processor.
Reviewed-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: default avatarGeorgi Djakov <georgi.djakov@linaro.org>
parent 24f516eb
...@@ -12,3 +12,6 @@ config INTERCONNECT_QCOM_SDM845 ...@@ -12,3 +12,6 @@ config INTERCONNECT_QCOM_SDM845
help help
This is a driver for the Qualcomm Network-on-Chip on sdm845-based This is a driver for the Qualcomm Network-on-Chip on sdm845-based
platforms. platforms.
config INTERCONNECT_QCOM_SMD_RPM
tristate
# SPDX-License-Identifier: GPL-2.0 # SPDX-License-Identifier: GPL-2.0
qnoc-sdm845-objs := sdm845.o qnoc-sdm845-objs := sdm845.o
icc-smd-rpm-objs := smd-rpm.o
obj-$(CONFIG_INTERCONNECT_QCOM_SDM845) += qnoc-sdm845.o obj-$(CONFIG_INTERCONNECT_QCOM_SDM845) += qnoc-sdm845.o
obj-$(CONFIG_INTERCONNECT_QCOM_SMD_RPM) += icc-smd-rpm.o
// SPDX-License-Identifier: GPL-2.0
/*
* RPM over SMD communication wrapper for interconnects
*
* Copyright (C) 2019 Linaro Ltd
* Author: Georgi Djakov <georgi.djakov@linaro.org>
*/
#include <linux/interconnect-provider.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/soc/qcom/smd-rpm.h>
#include "smd-rpm.h"
#define RPM_KEY_BW 0x00007762
static struct qcom_smd_rpm *icc_smd_rpm;
struct icc_rpm_smd_req {
__le32 key;
__le32 nbytes;
__le32 value;
};
bool qcom_icc_rpm_smd_available(void)
{
return !!icc_smd_rpm;
}
EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_available);
int qcom_icc_rpm_smd_send(int ctx, int rsc_type, int id, u32 val)
{
struct icc_rpm_smd_req req = {
.key = cpu_to_le32(RPM_KEY_BW),
.nbytes = cpu_to_le32(sizeof(u32)),
.value = cpu_to_le32(val),
};
return qcom_rpm_smd_write(icc_smd_rpm, ctx, rsc_type, id, &req,
sizeof(req));
}
EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_send);
static int qcom_icc_rpm_smd_remove(struct platform_device *pdev)
{
icc_smd_rpm = NULL;
return 0;
}
static int qcom_icc_rpm_smd_probe(struct platform_device *pdev)
{
icc_smd_rpm = dev_get_drvdata(pdev->dev.parent);
if (!icc_smd_rpm) {
dev_err(&pdev->dev, "unable to retrieve handle to RPM\n");
return -ENODEV;
}
return 0;
}
static struct platform_driver qcom_interconnect_rpm_smd_driver = {
.driver = {
.name = "icc_smd_rpm",
},
.probe = qcom_icc_rpm_smd_probe,
.remove = qcom_icc_rpm_smd_remove,
};
module_platform_driver(qcom_interconnect_rpm_smd_driver);
MODULE_AUTHOR("Georgi Djakov <georgi.djakov@linaro.org>");
MODULE_DESCRIPTION("Qualcomm SMD RPM interconnect proxy driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:icc_smd_rpm");
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2019, Linaro Ltd.
* Author: Georgi Djakov <georgi.djakov@linaro.org>
*/
#ifndef __DRIVERS_INTERCONNECT_QCOM_SMD_RPM_H
#define __DRIVERS_INTERCONNECT_QCOM_SMD_RPM_H
#include <linux/soc/qcom/smd-rpm.h>
bool qcom_icc_rpm_smd_available(void);
int qcom_icc_rpm_smd_send(int ctx, int rsc_type, int id, u32 val);
#endif
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