mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Florian Fainelli](/assets/img/avatar_default.png)
Since we do not have interrupts on BCM7216, we cannot have trip point crossing, the thermal subsystem expects us to provide a NULL set_trips operation in that case, so make it possible to provide per-process thermal_zone_of_device_ops Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20200114190607.29339-7-f.fainelli@gmail.com
382 lines
9.8 KiB
C
382 lines
9.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Broadcom STB AVS TMON thermal sensor driver
|
|
*
|
|
* Copyright (c) 2015-2017 Broadcom
|
|
*/
|
|
|
|
#define DRV_NAME "brcmstb_thermal"
|
|
|
|
#define pr_fmt(fmt) DRV_NAME ": " fmt
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/irqreturn.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/thermal.h>
|
|
|
|
#define AVS_TMON_STATUS 0x00
|
|
#define AVS_TMON_STATUS_valid_msk BIT(11)
|
|
#define AVS_TMON_STATUS_data_msk GENMASK(10, 1)
|
|
#define AVS_TMON_STATUS_data_shift 1
|
|
|
|
#define AVS_TMON_EN_OVERTEMP_RESET 0x04
|
|
#define AVS_TMON_EN_OVERTEMP_RESET_msk BIT(0)
|
|
|
|
#define AVS_TMON_RESET_THRESH 0x08
|
|
#define AVS_TMON_RESET_THRESH_msk GENMASK(10, 1)
|
|
#define AVS_TMON_RESET_THRESH_shift 1
|
|
|
|
#define AVS_TMON_INT_IDLE_TIME 0x10
|
|
|
|
#define AVS_TMON_EN_TEMP_INT_SRCS 0x14
|
|
#define AVS_TMON_EN_TEMP_INT_SRCS_high BIT(1)
|
|
#define AVS_TMON_EN_TEMP_INT_SRCS_low BIT(0)
|
|
|
|
#define AVS_TMON_INT_THRESH 0x18
|
|
#define AVS_TMON_INT_THRESH_high_msk GENMASK(26, 17)
|
|
#define AVS_TMON_INT_THRESH_high_shift 17
|
|
#define AVS_TMON_INT_THRESH_low_msk GENMASK(10, 1)
|
|
#define AVS_TMON_INT_THRESH_low_shift 1
|
|
|
|
#define AVS_TMON_TEMP_INT_CODE 0x1c
|
|
#define AVS_TMON_TP_TEST_ENABLE 0x20
|
|
|
|
/* Default coefficients */
|
|
#define AVS_TMON_TEMP_SLOPE 487
|
|
#define AVS_TMON_TEMP_OFFSET 410040
|
|
|
|
/* HW related temperature constants */
|
|
#define AVS_TMON_TEMP_MAX 0x3ff
|
|
#define AVS_TMON_TEMP_MIN -88161
|
|
#define AVS_TMON_TEMP_MASK AVS_TMON_TEMP_MAX
|
|
|
|
enum avs_tmon_trip_type {
|
|
TMON_TRIP_TYPE_LOW = 0,
|
|
TMON_TRIP_TYPE_HIGH,
|
|
TMON_TRIP_TYPE_RESET,
|
|
TMON_TRIP_TYPE_MAX,
|
|
};
|
|
|
|
struct avs_tmon_trip {
|
|
/* HW bit to enable the trip */
|
|
u32 enable_offs;
|
|
u32 enable_mask;
|
|
|
|
/* HW field to read the trip temperature */
|
|
u32 reg_offs;
|
|
u32 reg_msk;
|
|
int reg_shift;
|
|
};
|
|
|
|
static struct avs_tmon_trip avs_tmon_trips[] = {
|
|
/* Trips when temperature is below threshold */
|
|
[TMON_TRIP_TYPE_LOW] = {
|
|
.enable_offs = AVS_TMON_EN_TEMP_INT_SRCS,
|
|
.enable_mask = AVS_TMON_EN_TEMP_INT_SRCS_low,
|
|
.reg_offs = AVS_TMON_INT_THRESH,
|
|
.reg_msk = AVS_TMON_INT_THRESH_low_msk,
|
|
.reg_shift = AVS_TMON_INT_THRESH_low_shift,
|
|
},
|
|
/* Trips when temperature is above threshold */
|
|
[TMON_TRIP_TYPE_HIGH] = {
|
|
.enable_offs = AVS_TMON_EN_TEMP_INT_SRCS,
|
|
.enable_mask = AVS_TMON_EN_TEMP_INT_SRCS_high,
|
|
.reg_offs = AVS_TMON_INT_THRESH,
|
|
.reg_msk = AVS_TMON_INT_THRESH_high_msk,
|
|
.reg_shift = AVS_TMON_INT_THRESH_high_shift,
|
|
},
|
|
/* Automatically resets chip when above threshold */
|
|
[TMON_TRIP_TYPE_RESET] = {
|
|
.enable_offs = AVS_TMON_EN_OVERTEMP_RESET,
|
|
.enable_mask = AVS_TMON_EN_OVERTEMP_RESET_msk,
|
|
.reg_offs = AVS_TMON_RESET_THRESH,
|
|
.reg_msk = AVS_TMON_RESET_THRESH_msk,
|
|
.reg_shift = AVS_TMON_RESET_THRESH_shift,
|
|
},
|
|
};
|
|
|
|
struct brcmstb_thermal_params {
|
|
unsigned int offset;
|
|
unsigned int mult;
|
|
const struct thermal_zone_of_device_ops *of_ops;
|
|
};
|
|
|
|
struct brcmstb_thermal_priv {
|
|
void __iomem *tmon_base;
|
|
struct device *dev;
|
|
struct thermal_zone_device *thermal;
|
|
/* Process specific thermal parameters used for calculations */
|
|
const struct brcmstb_thermal_params *temp_params;
|
|
};
|
|
|
|
/* Convert a HW code to a temperature reading (millidegree celsius) */
|
|
static inline int avs_tmon_code_to_temp(struct brcmstb_thermal_priv *priv,
|
|
u32 code)
|
|
{
|
|
int offset = priv->temp_params->offset;
|
|
int mult = priv->temp_params->mult;
|
|
|
|
return (offset - (int)((code & AVS_TMON_TEMP_MASK) * mult));
|
|
}
|
|
|
|
/*
|
|
* Convert a temperature value (millidegree celsius) to a HW code
|
|
*
|
|
* @temp: temperature to convert
|
|
* @low: if true, round toward the low side
|
|
*/
|
|
static inline u32 avs_tmon_temp_to_code(struct brcmstb_thermal_priv *priv,
|
|
int temp, bool low)
|
|
{
|
|
int offset = priv->temp_params->offset;
|
|
int mult = priv->temp_params->mult;
|
|
|
|
if (temp < AVS_TMON_TEMP_MIN)
|
|
return AVS_TMON_TEMP_MAX; /* Maximum code value */
|
|
|
|
if (temp >= offset)
|
|
return 0; /* Minimum code value */
|
|
|
|
if (low)
|
|
return (u32)(DIV_ROUND_UP(offset - temp, mult));
|
|
else
|
|
return (u32)((offset - temp) / mult);
|
|
}
|
|
|
|
static int brcmstb_get_temp(void *data, int *temp)
|
|
{
|
|
struct brcmstb_thermal_priv *priv = data;
|
|
u32 val;
|
|
long t;
|
|
|
|
val = __raw_readl(priv->tmon_base + AVS_TMON_STATUS);
|
|
|
|
if (!(val & AVS_TMON_STATUS_valid_msk)) {
|
|
dev_err(priv->dev, "reading not valid\n");
|
|
return -EIO;
|
|
}
|
|
|
|
val = (val & AVS_TMON_STATUS_data_msk) >> AVS_TMON_STATUS_data_shift;
|
|
|
|
t = avs_tmon_code_to_temp(priv, val);
|
|
if (t < 0)
|
|
*temp = 0;
|
|
else
|
|
*temp = t;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void avs_tmon_trip_enable(struct brcmstb_thermal_priv *priv,
|
|
enum avs_tmon_trip_type type, int en)
|
|
{
|
|
struct avs_tmon_trip *trip = &avs_tmon_trips[type];
|
|
u32 val = __raw_readl(priv->tmon_base + trip->enable_offs);
|
|
|
|
dev_dbg(priv->dev, "%sable trip, type %d\n", en ? "en" : "dis", type);
|
|
|
|
if (en)
|
|
val |= trip->enable_mask;
|
|
else
|
|
val &= ~trip->enable_mask;
|
|
|
|
__raw_writel(val, priv->tmon_base + trip->enable_offs);
|
|
}
|
|
|
|
static int avs_tmon_get_trip_temp(struct brcmstb_thermal_priv *priv,
|
|
enum avs_tmon_trip_type type)
|
|
{
|
|
struct avs_tmon_trip *trip = &avs_tmon_trips[type];
|
|
u32 val = __raw_readl(priv->tmon_base + trip->reg_offs);
|
|
|
|
val &= trip->reg_msk;
|
|
val >>= trip->reg_shift;
|
|
|
|
return avs_tmon_code_to_temp(priv, val);
|
|
}
|
|
|
|
static void avs_tmon_set_trip_temp(struct brcmstb_thermal_priv *priv,
|
|
enum avs_tmon_trip_type type,
|
|
int temp)
|
|
{
|
|
struct avs_tmon_trip *trip = &avs_tmon_trips[type];
|
|
u32 val, orig;
|
|
|
|
dev_dbg(priv->dev, "set temp %d to %d\n", type, temp);
|
|
|
|
/* round toward low temp for the low interrupt */
|
|
val = avs_tmon_temp_to_code(priv, temp,
|
|
type == TMON_TRIP_TYPE_LOW);
|
|
|
|
val <<= trip->reg_shift;
|
|
val &= trip->reg_msk;
|
|
|
|
orig = __raw_readl(priv->tmon_base + trip->reg_offs);
|
|
orig &= ~trip->reg_msk;
|
|
orig |= val;
|
|
__raw_writel(orig, priv->tmon_base + trip->reg_offs);
|
|
}
|
|
|
|
static int avs_tmon_get_intr_temp(struct brcmstb_thermal_priv *priv)
|
|
{
|
|
u32 val;
|
|
|
|
val = __raw_readl(priv->tmon_base + AVS_TMON_TEMP_INT_CODE);
|
|
return avs_tmon_code_to_temp(priv, val);
|
|
}
|
|
|
|
static irqreturn_t brcmstb_tmon_irq_thread(int irq, void *data)
|
|
{
|
|
struct brcmstb_thermal_priv *priv = data;
|
|
int low, high, intr;
|
|
|
|
low = avs_tmon_get_trip_temp(priv, TMON_TRIP_TYPE_LOW);
|
|
high = avs_tmon_get_trip_temp(priv, TMON_TRIP_TYPE_HIGH);
|
|
intr = avs_tmon_get_intr_temp(priv);
|
|
|
|
dev_dbg(priv->dev, "low/intr/high: %d/%d/%d\n",
|
|
low, intr, high);
|
|
|
|
/* Disable high-temp until next threshold shift */
|
|
if (intr >= high)
|
|
avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 0);
|
|
/* Disable low-temp until next threshold shift */
|
|
if (intr <= low)
|
|
avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 0);
|
|
|
|
/*
|
|
* Notify using the interrupt temperature, in case the temperature
|
|
* changes before it can next be read out
|
|
*/
|
|
thermal_zone_device_update(priv->thermal, intr);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int brcmstb_set_trips(void *data, int low, int high)
|
|
{
|
|
struct brcmstb_thermal_priv *priv = data;
|
|
|
|
dev_dbg(priv->dev, "set trips %d <--> %d\n", low, high);
|
|
|
|
/*
|
|
* Disable low-temp if "low" is too small. As per thermal framework
|
|
* API, we use -INT_MAX rather than INT_MIN.
|
|
*/
|
|
if (low <= -INT_MAX) {
|
|
avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 0);
|
|
} else {
|
|
avs_tmon_set_trip_temp(priv, TMON_TRIP_TYPE_LOW, low);
|
|
avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 1);
|
|
}
|
|
|
|
/* Disable high-temp if "high" is too big. */
|
|
if (high == INT_MAX) {
|
|
avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 0);
|
|
} else {
|
|
avs_tmon_set_trip_temp(priv, TMON_TRIP_TYPE_HIGH, high);
|
|
avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct thermal_zone_of_device_ops brcmstb_16nm_of_ops = {
|
|
.get_temp = brcmstb_get_temp,
|
|
};
|
|
|
|
static const struct brcmstb_thermal_params brcmstb_16nm_params = {
|
|
.offset = 457829,
|
|
.mult = 557,
|
|
.of_ops = &brcmstb_16nm_of_ops,
|
|
};
|
|
|
|
static const struct thermal_zone_of_device_ops brcmstb_28nm_of_ops = {
|
|
.get_temp = brcmstb_get_temp,
|
|
.set_trips = brcmstb_set_trips,
|
|
};
|
|
|
|
static const struct brcmstb_thermal_params brcmstb_28nm_params = {
|
|
.offset = 410040,
|
|
.mult = 487,
|
|
.of_ops = &brcmstb_28nm_of_ops,
|
|
};
|
|
|
|
static const struct of_device_id brcmstb_thermal_id_table[] = {
|
|
{ .compatible = "brcm,avs-tmon-bcm7216", .data = &brcmstb_16nm_params },
|
|
{ .compatible = "brcm,avs-tmon", .data = &brcmstb_28nm_params },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, brcmstb_thermal_id_table);
|
|
|
|
static int brcmstb_thermal_probe(struct platform_device *pdev)
|
|
{
|
|
const struct thermal_zone_of_device_ops *of_ops;
|
|
struct thermal_zone_device *thermal;
|
|
struct brcmstb_thermal_priv *priv;
|
|
struct resource *res;
|
|
int irq, ret;
|
|
|
|
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->temp_params = of_device_get_match_data(&pdev->dev);
|
|
if (!priv->temp_params)
|
|
return -EINVAL;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
priv->tmon_base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(priv->tmon_base))
|
|
return PTR_ERR(priv->tmon_base);
|
|
|
|
priv->dev = &pdev->dev;
|
|
platform_set_drvdata(pdev, priv);
|
|
of_ops = priv->temp_params->of_ops;
|
|
|
|
thermal = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, priv,
|
|
of_ops);
|
|
if (IS_ERR(thermal)) {
|
|
ret = PTR_ERR(thermal);
|
|
dev_err(&pdev->dev, "could not register sensor: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
priv->thermal = thermal;
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq >= 0) {
|
|
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
|
|
brcmstb_tmon_irq_thread,
|
|
IRQF_ONESHOT,
|
|
DRV_NAME, priv);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "could not request IRQ: %d\n", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
dev_info(&pdev->dev, "registered AVS TMON of-sensor driver\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver brcmstb_thermal_driver = {
|
|
.probe = brcmstb_thermal_probe,
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.of_match_table = brcmstb_thermal_id_table,
|
|
},
|
|
};
|
|
module_platform_driver(brcmstb_thermal_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Brian Norris");
|
|
MODULE_DESCRIPTION("Broadcom STB AVS TMON thermal driver");
|