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
19 static struct imx_sc_ipc *thermal_ipc_handle;
20
21 struct imx_sc_sensor {
22 struct thermal_zone_device *tzd;
23 u32 resource_id;
24 };
25
26 struct req_get_temp {
27 u16 resource_id;
28 u8 type;
29 } __packed __aligned(4);
30
31 struct resp_get_temp {
32 s16 celsius;
33 s8 tenths;
34 } __packed __aligned(4);
35
36 struct 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
imx_sc_thermal_get_temp(struct thermal_zone_device * tz,int * temp)44 static 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
68 static const struct thermal_zone_device_ops imx_sc_thermal_ops = {
69 .get_temp = imx_sc_thermal_get_temp,
70 };
71
imx_sc_thermal_probe(struct platform_device * pdev)72 static 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
124 static 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
130 static const struct of_device_id imx_sc_thermal_table[] = {
131 { .compatible = "fsl,imx-sc-thermal", .data = imx_sc_sensors },
132 {}
133 };
134 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
135
136 static 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 };
143 module_platform_driver(imx_sc_thermal_driver);
144
145 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
146 MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
147 MODULE_LICENSE("GPL v2");
148
