1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2018 Broadcom
6 #include <linux/module.h>
7 #include <linux/of_address.h>
8 #include <linux/platform_device.h>
9 #include <linux/thermal.h>
12 * In stingray thermal IO memory,
13 * Total Number of available TMONs MASK is at offset 0
14 * temperature registers BASE is at 4 byte offset.
15 * Each TMON temperature register size is 4.
17 #define SR_TMON_TEMP_BASE(id) ((id) * 0x4)
19 #define SR_TMON_MAX_LIST 6
22 struct thermal_zone_device *tz;
23 unsigned int crit_temp;
25 struct sr_thermal *priv;
30 unsigned int max_crit_temp;
31 struct sr_tmon tmon[SR_TMON_MAX_LIST];
34 static int sr_get_temp(void *data, int *temp)
36 struct sr_tmon *tmon = data;
37 struct sr_thermal *sr_thermal = tmon->priv;
39 *temp = readl(sr_thermal->regs + SR_TMON_TEMP_BASE(tmon->tmon_id));
44 static const struct thermal_zone_of_device_ops sr_tz_ops = {
45 .get_temp = sr_get_temp,
48 static int sr_thermal_probe(struct platform_device *pdev)
50 struct device *dev = &pdev->dev;
51 struct sr_thermal *sr_thermal;
58 sr_thermal = devm_kzalloc(dev, sizeof(*sr_thermal), GFP_KERNEL);
62 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
66 sr_thermal->regs = (void __iomem *)devm_memremap(&pdev->dev, res->start,
69 if (IS_ERR(sr_thermal->regs)) {
70 dev_err(dev, "failed to get io address\n");
71 return PTR_ERR(sr_thermal->regs);
74 ret = device_property_read_u32(dev, "brcm,tmon-mask", &sr_tmon_list);
78 tmon = sr_thermal->tmon;
79 for (i = 0; i < SR_TMON_MAX_LIST; i++, tmon++) {
80 if (!(sr_tmon_list & BIT(i)))
83 /* Flush temperature registers */
84 writel(0, sr_thermal->regs + SR_TMON_TEMP_BASE(i));
86 tmon->priv = sr_thermal;
87 tmon->tz = devm_thermal_zone_of_sensor_register(dev, i, tmon,
90 return PTR_ERR(tmon->tz);
92 dev_dbg(dev, "thermal sensor %d registered\n", i);
94 platform_set_drvdata(pdev, sr_thermal);
99 static const struct of_device_id sr_thermal_of_match[] = {
100 { .compatible = "brcm,sr-thermal", },
103 MODULE_DEVICE_TABLE(of, sr_thermal_of_match);
105 static struct platform_driver sr_thermal_driver = {
106 .probe = sr_thermal_probe,
108 .name = "sr-thermal",
109 .of_match_table = sr_thermal_of_match,
112 module_platform_driver(sr_thermal_driver);
114 MODULE_AUTHOR("Pramod Kumar <pramod.kumar@broadcom.com>");
115 MODULE_DESCRIPTION("Stingray thermal driver");
116 MODULE_LICENSE("GPL v2");