117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2018 Broadcom
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/thermal.h>
|
|
|
|
/*
|
|
* In stingray thermal IO memory,
|
|
* Total Number of available TMONs MASK is at offset 0
|
|
* temperature registers BASE is at 4 byte offset.
|
|
* Each TMON temperature register size is 4.
|
|
*/
|
|
#define SR_TMON_TEMP_BASE(id) ((id) * 0x4)
|
|
|
|
#define SR_TMON_MAX_LIST 6
|
|
|
|
struct sr_tmon {
|
|
unsigned int crit_temp;
|
|
unsigned int tmon_id;
|
|
struct sr_thermal *priv;
|
|
};
|
|
|
|
struct sr_thermal {
|
|
void __iomem *regs;
|
|
unsigned int max_crit_temp;
|
|
struct sr_tmon tmon[SR_TMON_MAX_LIST];
|
|
};
|
|
|
|
static int sr_get_temp(struct thermal_zone_device *tz, int *temp)
|
|
{
|
|
struct sr_tmon *tmon = tz->devdata;
|
|
struct sr_thermal *sr_thermal = tmon->priv;
|
|
|
|
*temp = readl(sr_thermal->regs + SR_TMON_TEMP_BASE(tmon->tmon_id));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct thermal_zone_device_ops sr_tz_ops = {
|
|
.get_temp = sr_get_temp,
|
|
};
|
|
|
|
static int sr_thermal_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct thermal_zone_device *tz;
|
|
struct sr_thermal *sr_thermal;
|
|
struct sr_tmon *tmon;
|
|
struct resource *res;
|
|
u32 sr_tmon_list = 0;
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
sr_thermal = devm_kzalloc(dev, sizeof(*sr_thermal), GFP_KERNEL);
|
|
if (!sr_thermal)
|
|
return -ENOMEM;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -ENOENT;
|
|
|
|
sr_thermal->regs = (void __iomem *)devm_memremap(&pdev->dev, res->start,
|
|
resource_size(res),
|
|
MEMREMAP_WB);
|
|
if (IS_ERR(sr_thermal->regs)) {
|
|
dev_err(dev, "failed to get io address\n");
|
|
return PTR_ERR(sr_thermal->regs);
|
|
}
|
|
|
|
ret = device_property_read_u32(dev, "brcm,tmon-mask", &sr_tmon_list);
|
|
if (ret)
|
|
return ret;
|
|
|
|
tmon = sr_thermal->tmon;
|
|
for (i = 0; i < SR_TMON_MAX_LIST; i++, tmon++) {
|
|
if (!(sr_tmon_list & BIT(i)))
|
|
continue;
|
|
|
|
/* Flush temperature registers */
|
|
writel(0, sr_thermal->regs + SR_TMON_TEMP_BASE(i));
|
|
tmon->tmon_id = i;
|
|
tmon->priv = sr_thermal;
|
|
tz = devm_thermal_of_zone_register(dev, i, tmon,
|
|
&sr_tz_ops);
|
|
if (IS_ERR(tz))
|
|
return PTR_ERR(tz);
|
|
|
|
dev_dbg(dev, "thermal sensor %d registered\n", i);
|
|
}
|
|
platform_set_drvdata(pdev, sr_thermal);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id sr_thermal_of_match[] = {
|
|
{ .compatible = "brcm,sr-thermal", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sr_thermal_of_match);
|
|
|
|
static struct platform_driver sr_thermal_driver = {
|
|
.probe = sr_thermal_probe,
|
|
.driver = {
|
|
.name = "sr-thermal",
|
|
.of_match_table = sr_thermal_of_match,
|
|
},
|
|
};
|
|
module_platform_driver(sr_thermal_driver);
|
|
|
|
MODULE_AUTHOR("Pramod Kumar <pramod.kumar@broadcom.com>");
|
|
MODULE_DESCRIPTION("Stingray thermal driver");
|
|
MODULE_LICENSE("GPL v2");
|