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/of_device.h>
12 #include <linux/platform_device.h>
13 #include <linux/slab.h>
14 #include <linux/thermal.h>
15
16 #include "thermal_hwmon.h"
17
18 #define IMX_SC_MISC_FUNC_GET_TEMP 13
19
20 static struct imx_sc_ipc *thermal_ipc_handle;
21
22 struct imx_sc_sensor {
23 struct thermal_zone_device *tzd;
24 u32 resource_id;
25 };
26
27 struct req_get_temp {
28 u16 resource_id;
29 u8 type;
30 } __packed __aligned(4);
31
32 struct resp_get_temp {
33 s16 celsius;
34 s8 tenths;
35 } __packed __aligned(4);
36
37 struct imx_sc_msg_misc_get_temp {
38 struct imx_sc_rpc_msg hdr;
39 union {
40 struct req_get_temp req;
41 struct resp_get_temp resp;
42 } data;
43 } __packed __aligned(4);
44
imx_sc_thermal_get_temp(struct thermal_zone_device * tz,int * temp)45 static int imx_sc_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
46 {
47 struct imx_sc_msg_misc_get_temp msg;
48 struct imx_sc_rpc_msg *hdr = &msg.hdr;
49 struct imx_sc_sensor *sensor = tz->devdata;
50 int ret;
51
52 msg.data.req.resource_id = sensor->resource_id;
53 msg.data.req.type = IMX_SC_C_TEMP;
54
55 hdr->ver = IMX_SC_RPC_VERSION;
56 hdr->svc = IMX_SC_RPC_SVC_MISC;
57 hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
58 hdr->size = 2;
59
60 ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
61 if (ret) {
62 dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n",
63 sensor->resource_id, ret);
64 return ret;
65 }
66
67 *temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
68
69 return 0;
70 }
71
72 static const struct thermal_zone_device_ops imx_sc_thermal_ops = {
73 .get_temp = imx_sc_thermal_get_temp,
74 };
75
imx_sc_thermal_probe(struct platform_device * pdev)76 static int imx_sc_thermal_probe(struct platform_device *pdev)
77 {
78 struct imx_sc_sensor *sensor;
79 const int *resource_id;
80 int i, ret;
81
82 ret = imx_scu_get_handle(&thermal_ipc_handle);
83 if (ret)
84 return ret;
85
86 resource_id = of_device_get_match_data(&pdev->dev);
87 if (!resource_id)
88 return -EINVAL;
89
90 for (i = 0; resource_id[i] >= 0; i++) {
91
92 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
93 if (!sensor)
94 return -ENOMEM;
95
96 sensor->resource_id = resource_id[i];
97
98 sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,
99 sensor, &imx_sc_thermal_ops);
100 if (IS_ERR(sensor->tzd)) {
101 /*
102 * Save the error value before freeing the
103 * sensor pointer, otherwise we endup with a
104 * use-after-free error
105 */
106 ret = PTR_ERR(sensor->tzd);
107
108 devm_kfree(&pdev->dev, sensor);
109
110 /*
111 * The thermal framework notifies us there is
112 * no thermal zone description for such a
113 * sensor id
114 */
115 if (ret == -ENODEV)
116 continue;
117
118 dev_err(&pdev->dev, "failed to register thermal zone\n");
119 return ret;
120 }
121
122 if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
123 dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
124 }
125
126 return 0;
127 }
128
129 static const int imx_sc_sensors[] = {
130 IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0,
131 IMX_SC_R_AP_0, IMX_SC_R_AP_1,
132 IMX_SC_R_GPU_0_PID0, IMX_SC_R_GPU_1_PID0,
133 IMX_SC_R_DRC_0, -1 };
134
135 static const struct of_device_id imx_sc_thermal_table[] = {
136 { .compatible = "fsl,imx-sc-thermal", .data = imx_sc_sensors },
137 {}
138 };
139 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
140
141 static struct platform_driver imx_sc_thermal_driver = {
142 .probe = imx_sc_thermal_probe,
143 .driver = {
144 .name = "imx-sc-thermal",
145 .of_match_table = imx_sc_thermal_table,
146 },
147 };
148 module_platform_driver(imx_sc_thermal_driver);
149
150 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
151 MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
152 MODULE_LICENSE("GPL v2");
153