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
20 static struct qcom_smd_rpm *icc_smd_rpm;
21
22 struct icc_rpm_smd_req {
23 __le32 key;
24 __le32 nbytes;
25 __le32 value;
26 };
27
qcom_icc_rpm_smd_available(void)28 bool qcom_icc_rpm_smd_available(void)
29 {
30 return !!icc_smd_rpm;
31 }
32 EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_available);
33
qcom_icc_rpm_smd_send(int ctx,int rsc_type,int id,u32 val)34 int 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 }
45 EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_send);
46
qcom_icc_rpm_smd_remove(struct platform_device * pdev)47 static int qcom_icc_rpm_smd_remove(struct platform_device *pdev)
48 {
49 icc_smd_rpm = NULL;
50
51 return 0;
52 }
53
qcom_icc_rpm_smd_probe(struct platform_device * pdev)54 static 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
66 static 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 };
73 module_platform_driver(qcom_interconnect_rpm_smd_driver);
74 MODULE_AUTHOR("Georgi Djakov <georgi.djakov@linaro.org>");
75 MODULE_DESCRIPTION("Qualcomm SMD RPM interconnect proxy driver");
76 MODULE_LICENSE("GPL v2");
77 MODULE_ALIAS("platform:icc_smd_rpm");
78