linux/drivers/interconnect/qcom/smd-rpm.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * RPM over SMD communication wrapper for interconnects
   4 *
   5 * Copyright (C) 2019 Linaro Ltd
   6 * Author: Georgi Djakov <georgi.djakov@linaro.org>
   7 */
   8
   9#include <linux/interconnect-provider.h>
  10#include <linux/module.h>
  11#include <linux/of.h>
  12#include <linux/of_platform.h>
  13#include <linux/platform_device.h>
  14#include <linux/soc/qcom/smd-rpm.h>
  15
  16#include "smd-rpm.h"
  17
  18#define RPM_KEY_BW              0x00007762
  19
  20static struct qcom_smd_rpm *icc_smd_rpm;
  21
  22struct icc_rpm_smd_req {
  23        __le32 key;
  24        __le32 nbytes;
  25        __le32 value;
  26};
  27
  28bool qcom_icc_rpm_smd_available(void)
  29{
  30        return !!icc_smd_rpm;
  31}
  32EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_available);
  33
  34int qcom_icc_rpm_smd_send(int ctx, int rsc_type, int id, u32 val)
  35{
  36        struct icc_rpm_smd_req req = {
  37                .key = cpu_to_le32(RPM_KEY_BW),
  38                .nbytes = cpu_to_le32(sizeof(u32)),
  39                .value = cpu_to_le32(val),
  40        };
  41
  42        return qcom_rpm_smd_write(icc_smd_rpm, ctx, rsc_type, id, &req,
  43                                  sizeof(req));
  44}
  45EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_send);
  46
  47static int qcom_icc_rpm_smd_remove(struct platform_device *pdev)
  48{
  49        icc_smd_rpm = NULL;
  50
  51        return 0;
  52}
  53
  54static int qcom_icc_rpm_smd_probe(struct platform_device *pdev)
  55{
  56        icc_smd_rpm = dev_get_drvdata(pdev->dev.parent);
  57
  58        if (!icc_smd_rpm) {
  59                dev_err(&pdev->dev, "unable to retrieve handle to RPM\n");
  60                return -ENODEV;
  61        }
  62
  63        return 0;
  64}
  65
  66static struct platform_driver qcom_interconnect_rpm_smd_driver = {
  67        .driver = {
  68                .name           = "icc_smd_rpm",
  69        },
  70        .probe = qcom_icc_rpm_smd_probe,
  71        .remove = qcom_icc_rpm_smd_remove,
  72};
  73module_platform_driver(qcom_interconnect_rpm_smd_driver);
  74MODULE_AUTHOR("Georgi Djakov <georgi.djakov@linaro.org>");
  75MODULE_DESCRIPTION("Qualcomm SMD RPM interconnect proxy driver");
  76MODULE_LICENSE("GPL v2");
  77MODULE_ALIAS("platform:icc_smd_rpm");
  78