1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright 2018-2020 NXP.
4 */
5
6#include <dt-bindings/firmware/imx/rsrc.h>
7#include <linux/err.h>
8#include <linux/firmware/imx/sci.h>
9#include <linux/module.h>
10#include <linux/of.h>
11#include <linux/platform_device.h>
12#include <linux/slab.h>
13#include <linux/thermal.h>
14
15#include "thermal_hwmon.h"
16
17#define IMX_SC_MISC_FUNC_GET_TEMP	13
18
19static struct imx_sc_ipc *thermal_ipc_handle;
20
21struct imx_sc_sensor {
22	struct thermal_zone_device *tzd;
23	u32 resource_id;
24};
25
26struct req_get_temp {
27	u16 resource_id;
28	u8 type;
29} __packed __aligned(4);
30
31struct resp_get_temp {
32	s16 celsius;
33	s8 tenths;
34} __packed __aligned(4);
35
36struct imx_sc_msg_misc_get_temp {
37	struct imx_sc_rpc_msg hdr;
38	union {
39		struct req_get_temp req;
40		struct resp_get_temp resp;
41	} data;
42} __packed __aligned(4);
43
44static int imx_sc_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
45{
46	struct imx_sc_msg_misc_get_temp msg;
47	struct imx_sc_rpc_msg *hdr = &msg.hdr;
48	struct imx_sc_sensor *sensor = thermal_zone_device_priv(tz);
49	int ret;
50
51	msg.data.req.resource_id = sensor->resource_id;
52	msg.data.req.type = IMX_SC_C_TEMP;
53
54	hdr->ver = IMX_SC_RPC_VERSION;
55	hdr->svc = IMX_SC_RPC_SVC_MISC;
56	hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
57	hdr->size = 2;
58
59	ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
60	if (ret)
61		return ret;
62
63	*temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
64
65	return 0;
66}
67
68static const struct thermal_zone_device_ops imx_sc_thermal_ops = {
69	.get_temp = imx_sc_thermal_get_temp,
70};
71
72static int imx_sc_thermal_probe(struct platform_device *pdev)
73{
74	struct imx_sc_sensor *sensor;
75	const int *resource_id;
76	int i, ret;
77
78	ret = imx_scu_get_handle(&thermal_ipc_handle);
79	if (ret)
80		return ret;
81
82	resource_id = of_device_get_match_data(&pdev->dev);
83	if (!resource_id)
84		return -EINVAL;
85
86	for (i = 0; resource_id[i] >= 0; i++) {
87
88		sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
89		if (!sensor)
90			return -ENOMEM;
91
92		sensor->resource_id = resource_id[i];
93
94		sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,
95							    sensor, &imx_sc_thermal_ops);
96		if (IS_ERR(sensor->tzd)) {
97			/*
98			 * Save the error value before freeing the
99			 * sensor pointer, otherwise we endup with a
100			 * use-after-free error
101			 */
102			ret = PTR_ERR(sensor->tzd);
103
104			devm_kfree(&pdev->dev, sensor);
105
106			/*
107			 * The thermal framework notifies us there is
108			 * no thermal zone description for such a
109			 * sensor id
110			 */
111			if (ret == -ENODEV)
112				continue;
113
114			dev_err(&pdev->dev, "failed to register thermal zone\n");
115			return ret;
116		}
117
118		devm_thermal_add_hwmon_sysfs(&pdev->dev, sensor->tzd);
119	}
120
121	return 0;
122}
123
124static const int imx_sc_sensors[] = {
125	IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0,
126	IMX_SC_R_AP_0, IMX_SC_R_AP_1,
127	IMX_SC_R_GPU_0_PID0, IMX_SC_R_GPU_1_PID0,
128	IMX_SC_R_DRC_0, -1 };
129
130static const struct of_device_id imx_sc_thermal_table[] = {
131	{ .compatible = "fsl,imx-sc-thermal", .data =  imx_sc_sensors },
132	{}
133};
134MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
135
136static struct platform_driver imx_sc_thermal_driver = {
137		.probe = imx_sc_thermal_probe,
138		.driver = {
139			.name = "imx-sc-thermal",
140			.of_match_table = imx_sc_thermal_table,
141		},
142};
143module_platform_driver(imx_sc_thermal_driver);
144
145MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
146MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
147MODULE_LICENSE("GPL v2");
148