1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * PowerNV sensor code
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2013 IBM
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/delay.h>
9*4882a593Smuzhiyun #include <linux/of_platform.h>
10*4882a593Smuzhiyun #include <asm/opal.h>
11*4882a593Smuzhiyun #include <asm/machdep.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun /*
14*4882a593Smuzhiyun * This will return sensor information to driver based on the requested sensor
15*4882a593Smuzhiyun * handle. A handle is an opaque id for the powernv, read by the driver from the
16*4882a593Smuzhiyun * device tree..
17*4882a593Smuzhiyun */
opal_get_sensor_data(u32 sensor_hndl,u32 * sensor_data)18*4882a593Smuzhiyun int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun int ret, token;
21*4882a593Smuzhiyun struct opal_msg msg;
22*4882a593Smuzhiyun __be32 data;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun token = opal_async_get_token_interruptible();
25*4882a593Smuzhiyun if (token < 0)
26*4882a593Smuzhiyun return token;
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun ret = opal_sensor_read(sensor_hndl, token, &data);
29*4882a593Smuzhiyun switch (ret) {
30*4882a593Smuzhiyun case OPAL_ASYNC_COMPLETION:
31*4882a593Smuzhiyun ret = opal_async_wait_response(token, &msg);
32*4882a593Smuzhiyun if (ret) {
33*4882a593Smuzhiyun pr_err("%s: Failed to wait for the async response, %d\n",
34*4882a593Smuzhiyun __func__, ret);
35*4882a593Smuzhiyun goto out;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun ret = opal_error_code(opal_get_async_rc(msg));
39*4882a593Smuzhiyun *sensor_data = be32_to_cpu(data);
40*4882a593Smuzhiyun break;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun case OPAL_SUCCESS:
43*4882a593Smuzhiyun ret = 0;
44*4882a593Smuzhiyun *sensor_data = be32_to_cpu(data);
45*4882a593Smuzhiyun break;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun case OPAL_WRONG_STATE:
48*4882a593Smuzhiyun ret = -EIO;
49*4882a593Smuzhiyun break;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun default:
52*4882a593Smuzhiyun ret = opal_error_code(ret);
53*4882a593Smuzhiyun break;
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun out:
57*4882a593Smuzhiyun opal_async_release_token(token);
58*4882a593Smuzhiyun return ret;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(opal_get_sensor_data);
61*4882a593Smuzhiyun
opal_get_sensor_data_u64(u32 sensor_hndl,u64 * sensor_data)62*4882a593Smuzhiyun int opal_get_sensor_data_u64(u32 sensor_hndl, u64 *sensor_data)
63*4882a593Smuzhiyun {
64*4882a593Smuzhiyun int ret, token;
65*4882a593Smuzhiyun struct opal_msg msg;
66*4882a593Smuzhiyun __be64 data;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun if (!opal_check_token(OPAL_SENSOR_READ_U64)) {
69*4882a593Smuzhiyun u32 sdata;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun ret = opal_get_sensor_data(sensor_hndl, &sdata);
72*4882a593Smuzhiyun if (!ret)
73*4882a593Smuzhiyun *sensor_data = sdata;
74*4882a593Smuzhiyun return ret;
75*4882a593Smuzhiyun }
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun token = opal_async_get_token_interruptible();
78*4882a593Smuzhiyun if (token < 0)
79*4882a593Smuzhiyun return token;
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun ret = opal_sensor_read_u64(sensor_hndl, token, &data);
82*4882a593Smuzhiyun switch (ret) {
83*4882a593Smuzhiyun case OPAL_ASYNC_COMPLETION:
84*4882a593Smuzhiyun ret = opal_async_wait_response(token, &msg);
85*4882a593Smuzhiyun if (ret) {
86*4882a593Smuzhiyun pr_err("%s: Failed to wait for the async response, %d\n",
87*4882a593Smuzhiyun __func__, ret);
88*4882a593Smuzhiyun goto out_token;
89*4882a593Smuzhiyun }
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun ret = opal_error_code(opal_get_async_rc(msg));
92*4882a593Smuzhiyun *sensor_data = be64_to_cpu(data);
93*4882a593Smuzhiyun break;
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun case OPAL_SUCCESS:
96*4882a593Smuzhiyun ret = 0;
97*4882a593Smuzhiyun *sensor_data = be64_to_cpu(data);
98*4882a593Smuzhiyun break;
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun case OPAL_WRONG_STATE:
101*4882a593Smuzhiyun ret = -EIO;
102*4882a593Smuzhiyun break;
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun default:
105*4882a593Smuzhiyun ret = opal_error_code(ret);
106*4882a593Smuzhiyun break;
107*4882a593Smuzhiyun }
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun out_token:
110*4882a593Smuzhiyun opal_async_release_token(token);
111*4882a593Smuzhiyun return ret;
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(opal_get_sensor_data_u64);
114*4882a593Smuzhiyun
opal_sensor_init(void)115*4882a593Smuzhiyun int __init opal_sensor_init(void)
116*4882a593Smuzhiyun {
117*4882a593Smuzhiyun struct platform_device *pdev;
118*4882a593Smuzhiyun struct device_node *sensor;
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun sensor = of_find_node_by_path("/ibm,opal/sensors");
121*4882a593Smuzhiyun if (!sensor) {
122*4882a593Smuzhiyun pr_err("Opal node 'sensors' not found\n");
123*4882a593Smuzhiyun return -ENODEV;
124*4882a593Smuzhiyun }
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun pdev = of_platform_device_create(sensor, "opal-sensor", NULL);
127*4882a593Smuzhiyun of_node_put(sensor);
128*4882a593Smuzhiyun
129*4882a593Smuzhiyun return PTR_ERR_OR_ZERO(pdev);
130*4882a593Smuzhiyun }
131