// SPDX-License-Identifier: GPL-2.0-only
|
/*
|
* Copyright (C) 2017 Rafał Miłecki <rafal@milecki.pl>
|
*/
|
|
#include <linux/module.h>
|
#include <linux/of_address.h>
|
#include <linux/platform_device.h>
|
#include <linux/thermal.h>
|
|
#define PVTMON_CONTROL0 0x00
|
#define PVTMON_CONTROL0_SEL_MASK 0x0000000e
|
#define PVTMON_CONTROL0_SEL_TEMP_MONITOR 0x00000000
|
#define PVTMON_CONTROL0_SEL_TEST_MODE 0x0000000e
|
#define PVTMON_STATUS 0x08
|
|
struct ns_thermal {
|
struct thermal_zone_device *tz;
|
void __iomem *pvtmon;
|
};
|
|
static int ns_thermal_get_temp(void *data, int *temp)
|
{
|
struct ns_thermal *ns_thermal = data;
|
int offset = thermal_zone_get_offset(ns_thermal->tz);
|
int slope = thermal_zone_get_slope(ns_thermal->tz);
|
u32 val;
|
|
val = readl(ns_thermal->pvtmon + PVTMON_CONTROL0);
|
if ((val & PVTMON_CONTROL0_SEL_MASK) != PVTMON_CONTROL0_SEL_TEMP_MONITOR) {
|
/* Clear current mode selection */
|
val &= ~PVTMON_CONTROL0_SEL_MASK;
|
|
/* Set temp monitor mode (it's the default actually) */
|
val |= PVTMON_CONTROL0_SEL_TEMP_MONITOR;
|
|
writel(val, ns_thermal->pvtmon + PVTMON_CONTROL0);
|
}
|
|
val = readl(ns_thermal->pvtmon + PVTMON_STATUS);
|
*temp = slope * val + offset;
|
|
return 0;
|
}
|
|
static const struct thermal_zone_of_device_ops ns_thermal_ops = {
|
.get_temp = ns_thermal_get_temp,
|
};
|
|
static int ns_thermal_probe(struct platform_device *pdev)
|
{
|
struct device *dev = &pdev->dev;
|
struct ns_thermal *ns_thermal;
|
|
ns_thermal = devm_kzalloc(dev, sizeof(*ns_thermal), GFP_KERNEL);
|
if (!ns_thermal)
|
return -ENOMEM;
|
|
ns_thermal->pvtmon = of_iomap(dev_of_node(dev), 0);
|
if (WARN_ON(!ns_thermal->pvtmon))
|
return -ENOENT;
|
|
ns_thermal->tz = devm_thermal_zone_of_sensor_register(dev, 0,
|
ns_thermal,
|
&ns_thermal_ops);
|
if (IS_ERR(ns_thermal->tz)) {
|
iounmap(ns_thermal->pvtmon);
|
return PTR_ERR(ns_thermal->tz);
|
}
|
|
platform_set_drvdata(pdev, ns_thermal);
|
|
return 0;
|
}
|
|
static int ns_thermal_remove(struct platform_device *pdev)
|
{
|
struct ns_thermal *ns_thermal = platform_get_drvdata(pdev);
|
|
iounmap(ns_thermal->pvtmon);
|
|
return 0;
|
}
|
|
static const struct of_device_id ns_thermal_of_match[] = {
|
{ .compatible = "brcm,ns-thermal", },
|
{},
|
};
|
MODULE_DEVICE_TABLE(of, ns_thermal_of_match);
|
|
static struct platform_driver ns_thermal_driver = {
|
.probe = ns_thermal_probe,
|
.remove = ns_thermal_remove,
|
.driver = {
|
.name = "ns-thermal",
|
.of_match_table = ns_thermal_of_match,
|
},
|
};
|
module_platform_driver(ns_thermal_driver);
|
|
MODULE_AUTHOR("Rafał Miłecki <rafal@milecki.pl>");
|
MODULE_DESCRIPTION("Northstar thermal driver");
|
MODULE_LICENSE("GPL v2");
|
