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// 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
static int ns_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
{
void __iomem *pvtmon = thermal_zone_device_priv(tz);
int offset = thermal_zone_get_offset(tz);
int slope = thermal_zone_get_slope(tz);
u32 val;
val = readl(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, pvtmon + PVTMON_CONTROL0);
}
val = readl(pvtmon + PVTMON_STATUS);
*temp = slope * val + offset;
return 0;
}
static const struct thermal_zone_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 thermal_zone_device *tz;
void __iomem *pvtmon;
pvtmon = of_iomap(dev_of_node(dev), 0);
if (WARN_ON(!pvtmon))
return -ENOENT;
tz = devm_thermal_of_zone_register(dev, 0,
pvtmon,
&ns_thermal_ops);
if (IS_ERR(tz)) {
iounmap(pvtmon);
return PTR_ERR(tz);
}
platform_set_drvdata(pdev, pvtmon);
return 0;
}
static void ns_thermal_remove(struct platform_device *pdev)
{
void __iomem *pvtmon = platform_get_drvdata(pdev);
iounmap(pvtmon);
}
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_new = 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");
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