1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * RPM over SMD communication wrapper for interconnects
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2019 Linaro Ltd
6*4882a593Smuzhiyun * Author: Georgi Djakov <georgi.djakov@linaro.org>
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/interconnect-provider.h>
10*4882a593Smuzhiyun #include <linux/module.h>
11*4882a593Smuzhiyun #include <linux/of.h>
12*4882a593Smuzhiyun #include <linux/of_platform.h>
13*4882a593Smuzhiyun #include <linux/platform_device.h>
14*4882a593Smuzhiyun #include <linux/soc/qcom/smd-rpm.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include "smd-rpm.h"
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #define RPM_KEY_BW 0x00007762
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun static struct qcom_smd_rpm *icc_smd_rpm;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun struct icc_rpm_smd_req {
23*4882a593Smuzhiyun __le32 key;
24*4882a593Smuzhiyun __le32 nbytes;
25*4882a593Smuzhiyun __le32 value;
26*4882a593Smuzhiyun };
27*4882a593Smuzhiyun
qcom_icc_rpm_smd_available(void)28*4882a593Smuzhiyun bool qcom_icc_rpm_smd_available(void)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun return !!icc_smd_rpm;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_available);
33*4882a593Smuzhiyun
qcom_icc_rpm_smd_send(int ctx,int rsc_type,int id,u32 val)34*4882a593Smuzhiyun int qcom_icc_rpm_smd_send(int ctx, int rsc_type, int id, u32 val)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun struct icc_rpm_smd_req req = {
37*4882a593Smuzhiyun .key = cpu_to_le32(RPM_KEY_BW),
38*4882a593Smuzhiyun .nbytes = cpu_to_le32(sizeof(u32)),
39*4882a593Smuzhiyun .value = cpu_to_le32(val),
40*4882a593Smuzhiyun };
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun return qcom_rpm_smd_write(icc_smd_rpm, ctx, rsc_type, id, &req,
43*4882a593Smuzhiyun sizeof(req));
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_send);
46*4882a593Smuzhiyun
qcom_icc_rpm_smd_remove(struct platform_device * pdev)47*4882a593Smuzhiyun static int qcom_icc_rpm_smd_remove(struct platform_device *pdev)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun icc_smd_rpm = NULL;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun return 0;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
qcom_icc_rpm_smd_probe(struct platform_device * pdev)54*4882a593Smuzhiyun static int qcom_icc_rpm_smd_probe(struct platform_device *pdev)
55*4882a593Smuzhiyun {
56*4882a593Smuzhiyun icc_smd_rpm = dev_get_drvdata(pdev->dev.parent);
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun if (!icc_smd_rpm) {
59*4882a593Smuzhiyun dev_err(&pdev->dev, "unable to retrieve handle to RPM\n");
60*4882a593Smuzhiyun return -ENODEV;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun return 0;
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun static struct platform_driver qcom_interconnect_rpm_smd_driver = {
67*4882a593Smuzhiyun .driver = {
68*4882a593Smuzhiyun .name = "icc_smd_rpm",
69*4882a593Smuzhiyun },
70*4882a593Smuzhiyun .probe = qcom_icc_rpm_smd_probe,
71*4882a593Smuzhiyun .remove = qcom_icc_rpm_smd_remove,
72*4882a593Smuzhiyun };
73*4882a593Smuzhiyun module_platform_driver(qcom_interconnect_rpm_smd_driver);
74*4882a593Smuzhiyun MODULE_AUTHOR("Georgi Djakov <georgi.djakov@linaro.org>");
75*4882a593Smuzhiyun MODULE_DESCRIPTION("Qualcomm SMD RPM interconnect proxy driver");
76*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
77*4882a593Smuzhiyun MODULE_ALIAS("platform:icc_smd_rpm");
78