forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
2.5 KiB
103 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Copyright (C) 2017 Rafał Miłecki <[email protected]> |
|
*/ |
|
|
|
#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 <[email protected]>"); |
|
MODULE_DESCRIPTION("Northstar thermal driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|