1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/module.h>
7*4882a593Smuzhiyun #include <linux/of_address.h>
8*4882a593Smuzhiyun #include <linux/platform_device.h>
9*4882a593Smuzhiyun #include <linux/thermal.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun struct thermal_mmio {
12*4882a593Smuzhiyun void __iomem *mmio_base;
13*4882a593Smuzhiyun u32 (*read_mmio)(void __iomem *mmio_base);
14*4882a593Smuzhiyun u32 mask;
15*4882a593Smuzhiyun int factor;
16*4882a593Smuzhiyun };
17*4882a593Smuzhiyun
thermal_mmio_readb(void __iomem * mmio_base)18*4882a593Smuzhiyun static u32 thermal_mmio_readb(void __iomem *mmio_base)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun return readb(mmio_base);
21*4882a593Smuzhiyun }
22*4882a593Smuzhiyun
thermal_mmio_get_temperature(void * private,int * temp)23*4882a593Smuzhiyun static int thermal_mmio_get_temperature(void *private, int *temp)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun int t;
26*4882a593Smuzhiyun struct thermal_mmio *sensor =
27*4882a593Smuzhiyun (struct thermal_mmio *)private;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun t = sensor->read_mmio(sensor->mmio_base) & sensor->mask;
30*4882a593Smuzhiyun t *= sensor->factor;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun *temp = t;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun return 0;
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun static struct thermal_zone_of_device_ops thermal_mmio_ops = {
38*4882a593Smuzhiyun .get_temp = thermal_mmio_get_temperature,
39*4882a593Smuzhiyun };
40*4882a593Smuzhiyun
thermal_mmio_probe(struct platform_device * pdev)41*4882a593Smuzhiyun static int thermal_mmio_probe(struct platform_device *pdev)
42*4882a593Smuzhiyun {
43*4882a593Smuzhiyun struct resource *resource;
44*4882a593Smuzhiyun struct thermal_mmio *sensor;
45*4882a593Smuzhiyun int (*sensor_init_func)(struct platform_device *pdev,
46*4882a593Smuzhiyun struct thermal_mmio *sensor);
47*4882a593Smuzhiyun struct thermal_zone_device *thermal_zone;
48*4882a593Smuzhiyun int ret;
49*4882a593Smuzhiyun int temperature;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
52*4882a593Smuzhiyun if (!sensor)
53*4882a593Smuzhiyun return -ENOMEM;
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
56*4882a593Smuzhiyun sensor->mmio_base = devm_ioremap_resource(&pdev->dev, resource);
57*4882a593Smuzhiyun if (IS_ERR(sensor->mmio_base)) {
58*4882a593Smuzhiyun dev_err(&pdev->dev, "failed to ioremap memory (%ld)\n",
59*4882a593Smuzhiyun PTR_ERR(sensor->mmio_base));
60*4882a593Smuzhiyun return PTR_ERR(sensor->mmio_base);
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun sensor_init_func = device_get_match_data(&pdev->dev);
64*4882a593Smuzhiyun if (sensor_init_func) {
65*4882a593Smuzhiyun ret = sensor_init_func(pdev, sensor);
66*4882a593Smuzhiyun if (ret) {
67*4882a593Smuzhiyun dev_err(&pdev->dev,
68*4882a593Smuzhiyun "failed to initialize sensor (%d)\n",
69*4882a593Smuzhiyun ret);
70*4882a593Smuzhiyun return ret;
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun }
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun thermal_zone = devm_thermal_zone_of_sensor_register(&pdev->dev,
75*4882a593Smuzhiyun 0,
76*4882a593Smuzhiyun sensor,
77*4882a593Smuzhiyun &thermal_mmio_ops);
78*4882a593Smuzhiyun if (IS_ERR(thermal_zone)) {
79*4882a593Smuzhiyun dev_err(&pdev->dev,
80*4882a593Smuzhiyun "failed to register sensor (%ld)\n",
81*4882a593Smuzhiyun PTR_ERR(thermal_zone));
82*4882a593Smuzhiyun return PTR_ERR(thermal_zone);
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun thermal_mmio_get_temperature(sensor, &temperature);
86*4882a593Smuzhiyun dev_info(&pdev->dev,
87*4882a593Smuzhiyun "thermal mmio sensor %s registered, current temperature: %d\n",
88*4882a593Smuzhiyun pdev->name, temperature);
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun return 0;
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
al_thermal_init(struct platform_device * pdev,struct thermal_mmio * sensor)93*4882a593Smuzhiyun static int al_thermal_init(struct platform_device *pdev,
94*4882a593Smuzhiyun struct thermal_mmio *sensor)
95*4882a593Smuzhiyun {
96*4882a593Smuzhiyun sensor->read_mmio = thermal_mmio_readb;
97*4882a593Smuzhiyun sensor->mask = 0xff;
98*4882a593Smuzhiyun sensor->factor = 1000;
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun return 0;
101*4882a593Smuzhiyun }
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun static const struct of_device_id thermal_mmio_id_table[] = {
104*4882a593Smuzhiyun { .compatible = "amazon,al-thermal", .data = al_thermal_init},
105*4882a593Smuzhiyun {}
106*4882a593Smuzhiyun };
107*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, thermal_mmio_id_table);
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun static struct platform_driver thermal_mmio_driver = {
110*4882a593Smuzhiyun .probe = thermal_mmio_probe,
111*4882a593Smuzhiyun .driver = {
112*4882a593Smuzhiyun .name = "thermal-mmio",
113*4882a593Smuzhiyun .of_match_table = of_match_ptr(thermal_mmio_id_table),
114*4882a593Smuzhiyun },
115*4882a593Smuzhiyun };
116*4882a593Smuzhiyun
117*4882a593Smuzhiyun module_platform_driver(thermal_mmio_driver);
118*4882a593Smuzhiyun
119*4882a593Smuzhiyun MODULE_AUTHOR("Talel Shenhar <talel@amazon.com>");
120*4882a593Smuzhiyun MODULE_DESCRIPTION("Thermal MMIO Driver");
121*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
122