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// 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/platform_device.h>
#include <linux/soc/qcom/smd-rpm.h>
#include "icc-rpm.h"
#define RPM_KEY_BW 0x00007762
#define QCOM_RPM_SMD_KEY_RATE 0x007a484b
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);
int qcom_icc_rpm_set_bus_rate(const struct rpm_clk_resource *clk, int ctx, u32 rate)
{
struct clk_smd_rpm_req req = {
.key = cpu_to_le32(QCOM_RPM_SMD_KEY_RATE),
.nbytes = cpu_to_le32(sizeof(u32)),
};
/* Branch clocks are only on/off */
if (clk->branch)
rate = !!rate;
req.value = cpu_to_le32(rate);
return qcom_rpm_smd_write(icc_smd_rpm,
ctx,
clk->resource_type,
clk->clock_id,
&req, sizeof(req));
}
EXPORT_SYMBOL_GPL(qcom_icc_rpm_set_bus_rate);
static void qcom_icc_rpm_smd_remove(struct platform_device *pdev)
{
icc_smd_rpm = NULL;
}
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_new = 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");
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