- 根目录:
- drivers
- thermal
- rockchip_thermal.c
/*
* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/thermal.h>
/**
* If the temperature over a period of time High,
* the resulting TSHUT gave CRU module,let it reset the entire chip,
* or via GPIO give PMIC.
*/
enum tshut_mode {
TSHUT_MODE_CRU = 0,
TSHUT_MODE_GPIO,
};
/**
* the system Temperature Sensors tshut(tshut) polarity
* the bit 8 is tshut polarity.
* 0: low active, 1: high active
*/
enum tshut_polarity {
TSHUT_LOW_ACTIVE = 0,
TSHUT_HIGH_ACTIVE,
};
/**
* The system has three Temperature Sensors. channel 0 is reserved,
* channel 1 is for CPU, and channel 2 is for GPU.
*/
enum sensor_id {
SENSOR_CPU = 1,
SENSOR_GPU,
};
struct rockchip_tsadc_chip {
/* The hardware-controlled tshut property */
long tshut_temp;
enum tshut_mode tshut_mode;
enum tshut_polarity tshut_polarity;
/* Chip-wide methods */
void (*initialize)(void __iomem *reg, enum tshut_polarity p);
void (*irq_ack)(void __iomem *reg);
void (*control)(void __iomem *reg, bool on);
/* Per-sensor methods */
int (*get_temp)(int chn, void __iomem *reg, long *temp);
void (*set_tshut_temp)(int chn, void __iomem *reg, long temp);
void (*set_tshut_mode)(int chn, void __iomem *reg, enum tshut_mode m);
};
struct rockchip_thermal_sensor {
struct rockchip_thermal_data *thermal;
struct thermal_zone_device *tzd;
enum sensor_id id;
};
#define NUM_SENSORS 2 /* Ignore unused sensor 0 */
struct rockchip_thermal_data {
const struct rockchip_tsadc_chip *chip;
struct platform_device *pdev;
struct reset_control *reset;
struct rockchip_thermal_sensor sensors[NUM_SENSORS];
struct clk *clk;
struct clk *pclk;
void __iomem *regs;
long tshut_temp;
enum tshut_mode tshut_mode;
enum tshut_polarity tshut_polarity;
};
/* TSADC V2 Sensor info define: */
#define TSADCV2_AUTO_CON 0x04
#define TSADCV2_INT_EN 0x08
#define TSADCV2_INT_PD 0x0c
#define TSADCV2_DATA(chn) (0x20 + (chn) * 0x04)
#define TSADCV2_COMP_SHUT(chn) (0x40 + (chn) * 0x04)
#define TSADCV2_HIGHT_INT_DEBOUNCE 0x60
#define TSADCV2_HIGHT_TSHUT_DEBOUNCE 0x64
#define TSADCV2_AUTO_PERIOD 0x68
#define TSADCV2_AUTO_PERIOD_HT 0x6c
#define TSADCV2_AUTO_EN BIT(0)
#define TSADCV2_AUTO_DISABLE ~BIT(0)
#define TSADCV2_AUTO_SRC_EN(chn) BIT(4 + (chn))
#define TSADCV2_AUTO_TSHUT_POLARITY_HIGH BIT(8)
#define TSADCV2_AUTO_TSHUT_POLARITY_LOW ~BIT(8)
#define TSADCV2_INT_SRC_EN(chn) BIT(chn)
#define TSADCV2_SHUT_2GPIO_SRC_EN(chn) BIT(4 + (chn))
#define TSADCV2_SHUT_2CRU_SRC_EN(chn) BIT(8 + (chn))
#define TSADCV2_INT_PD_CLEAR ~BIT(8)
#define TSADCV2_DATA_MASK 0xfff
#define TSADCV2_HIGHT_INT_DEBOUNCE_COUNT 4
#define TSADCV2_HIGHT_TSHUT_DEBOUNCE_COUNT 4
#define TSADCV2_AUTO_PERIOD_TIME 250 /* msec */
#define TSADCV2_AUTO_PERIOD_HT_TIME 50 /* msec */
struct tsadc_table {
unsigned long code;
long temp;
};
static const struct tsadc_table v2_code_table[] = {
{TSADCV2_DATA_MASK, -40000},
{3800, -40000},
{3792, -35000},
{3783, -30000},
{3774, -25000},
{3765, -20000},
{3756, -15000},
{3747, -10000},
{3737, -5000},
{3728, 0},
{3718, 5000},
{3708, 10000},
{3698, 15000},
{3688, 20000},
{3678, 25000},
{3667, 30000},
{3656, 35000},
{3645, 40000},
{3634, 45000},
{3623, 50000},
{3611, 55000},
{3600, 60000},
{3588, 65000},
{3575, 70000},
{3563, 75000},
{3550, 80000},
{3537, 85000},
{3524, 90000},
{3510, 95000},
{3496, 100000},
{3482, 105000},
{3467, 110000},
{3452, 115000},
{3437, 120000},
{3421, 125000},
{0, 125000},
};
static u32 rk_tsadcv2_temp_to_code(long temp)
{
int high, low, mid;
low = 0;
high = ARRAY_SIZE(v2_code_table) - 1;
mid = (high + low) / 2;
if (temp < v2_code_table[low].temp || temp > v2_code_table[high].temp)
return 0;
while (low <= high) {
if (temp == v2_code_table[mid].temp)
return v2_code_table[mid].code;
else if (temp < v2_code_table[mid].temp)
high = mid - 1;
else
low = mid + 1;
mid = (low + high) / 2;
}
return 0;
}
static long rk_tsadcv2_code_to_temp(u32 code)
{
unsigned int low = 0;
unsigned int high = ARRAY_SIZE(v2_code_table) - 1;
unsigned int mid = (low + high) / 2;
unsigned int num;
unsigned long denom;
/* Invalid code, return -EAGAIN */
if (code > TSADCV2_DATA_MASK)
return -EAGAIN;
while (low <= high && mid) {
if (code >= v2_code_table[mid].code &&
code < v2_code_table[mid - 1].code)
break;
else if (code < v2_code_table[mid].code)
low = mid + 1;
else
high = mid - 1;
mid = (low + high) / 2;
}
/*
* The 5C granularity provided by the table is too much. Let's
* assume that the relationship between sensor readings and
* temperature between 2 table entries is linear and interpolate
* to produce less granular result.
*/
num = v2_code_table[mid].temp - v2_code_table[mid - 1].temp;
num *= v2_code_table[mid - 1].code - code;
denom = v2_code_table[mid - 1].code - v2_code_table[mid].code;
return v2_code_table[mid - 1].temp + (num / denom);
}
/**
* rk_tsadcv2_initialize - initialize TASDC Controller
* (1) Set TSADCV2_AUTO_PERIOD, configure the interleave between
* every two accessing of TSADC in normal operation.
* (2) Set TSADCV2_AUTO_PERIOD_HT, configure the interleave between
* every two accessing of TSADC after the temperature is higher
* than COM_SHUT or COM_INT.
* (3) Set TSADCV2_HIGH_INT_DEBOUNCE and TSADC_HIGHT_TSHUT_DEBOUNCE,
* if the temperature is higher than COMP_INT or COMP_SHUT for
* "debounce" times, TSADC controller will generate interrupt or TSHUT.
*/
static void rk_tsadcv2_initialize(void __iomem *regs,
enum tshut_polarity tshut_polarity)
{
if (tshut_polarity == TSHUT_HIGH_ACTIVE)
writel_relaxed(0 | (TSADCV2_AUTO_TSHUT_POLARITY_HIGH),
regs + TSADCV2_AUTO_CON);
else
writel_relaxed(0 | (TSADCV2_AUTO_TSHUT_POLARITY_LOW),
regs + TSADCV2_AUTO_CON);
writel_relaxed(TSADCV2_AUTO_PERIOD_TIME, regs + TSADCV2_AUTO_PERIOD);
writel_relaxed(TSADCV2_HIGHT_INT_DEBOUNCE_COUNT,
regs + TSADCV2_HIGHT_INT_DEBOUNCE);
writel_relaxed(TSADCV2_AUTO_PERIOD_HT_TIME,
regs + TSADCV2_AUTO_PERIOD_HT);
writel_relaxed(TSADCV2_HIGHT_TSHUT_DEBOUNCE_COUNT,
regs + TSADCV2_HIGHT_TSHUT_DEBOUNCE);
}
static void rk_tsadcv2_irq_ack(void __iomem *regs)
{
u32 val;
val = readl_relaxed(regs + TSADCV2_INT_PD);
writel_relaxed(val & TSADCV2_INT_PD_CLEAR, regs + TSADCV2_INT_PD);
}
static void rk_tsadcv2_control(void __iomem *regs, bool enable)
{
u32 val;
val = readl_relaxed(regs + TSADCV2_AUTO_CON);
if (enable)
val |= TSADCV2_AUTO_EN;
else
val &= ~TSADCV2_AUTO_EN;
writel_relaxed(val, regs + TSADCV2_AUTO_CON);
}
static int rk_tsadcv2_get_temp(int chn, void __iomem *regs, long *temp)
{
u32 val;
/* the A/D value of the channel last conversion need some time */
val = readl_relaxed(regs + TSADCV2_DATA(chn));
if (val == 0)
return -EAGAIN;
*temp = rk_tsadcv2_code_to_temp(val);
return 0;
}
static void rk_tsadcv2_tshut_temp(int chn, void __iomem *regs, long temp)
{
u32 tshut_value, val;
tshut_value = rk_tsadcv2_temp_to_code(temp);
writel_relaxed(tshut_value, regs + TSADCV2_COMP_SHUT(chn));
/* TSHUT will be valid */
val = readl_relaxed(regs + TSADCV2_AUTO_CON);
writel_relaxed(val | TSADCV2_AUTO_SRC_EN(chn), regs + TSADCV2_AUTO_CON);
}
static void rk_tsadcv2_tshut_mode(int chn, void __iomem *regs,
enum tshut_mode mode)
{
u32 val;
val = readl_relaxed(regs + TSADCV2_INT_EN);
if (mode == TSHUT_MODE_GPIO) {
val &= ~TSADCV2_SHUT_2CRU_SRC_EN(chn);
val |= TSADCV2_SHUT_2GPIO_SRC_EN(chn);
} else {
val &= ~TSADCV2_SHUT_2GPIO_SRC_EN(chn);
val |= TSADCV2_SHUT_2CRU_SRC_EN(chn);
}
writel_relaxed(val, regs + TSADCV2_INT_EN);
}
static const struct rockchip_tsadc_chip rk3288_tsadc_data = {
.tshut_mode = TSHUT_MODE_GPIO, /* default TSHUT via GPIO give PMIC */
.tshut_polarity = TSHUT_LOW_ACTIVE, /* default TSHUT LOW ACTIVE */
.tshut_temp = 95000,
.initialize = rk_tsadcv2_initialize,
.irq_ack = rk_tsadcv2_irq_ack,
.control = rk_tsadcv2_control,
.get_temp = rk_tsadcv2_get_temp,
.set_tshut_temp = rk_tsadcv2_tshut_temp,
.set_tshut_mode = rk_tsadcv2_tshut_mode,
};
static const struct of_device_id of_rockchip_thermal_match[] = {
{
.compatible = "rockchip,rk3288-tsadc",
.data = (void *)&rk3288_tsadc_data,
},
{ /* end */ },
};
MODULE_DEVICE_TABLE(of, of_rockchip_thermal_match);
static void
rockchip_thermal_toggle_sensor(struct rockchip_thermal_sensor *sensor, bool on)
{
struct thermal_zone_device *tzd = sensor->tzd;
tzd->ops->set_mode(tzd,
on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
}
static irqreturn_t rockchip_thermal_alarm_irq_thread(int irq, void *dev)
{
struct rockchip_thermal_data *thermal = dev;
int i;
dev_dbg(&thermal->pdev->dev, "thermal alarm\n");
thermal->chip->irq_ack(thermal->regs);
for (i = 0; i < ARRAY_SIZE(thermal->sensors); i++)
thermal_zone_device_update(thermal->sensors[i].tzd);
return IRQ_HANDLED;
}
static int rockchip_thermal_get_temp(void *_sensor, long *out_temp)
{
struct rockchip_thermal_sensor *sensor = _sensor;
struct rockchip_thermal_data *thermal = sensor->thermal;
const struct rockchip_tsadc_chip *tsadc = sensor->thermal->chip;
int retval;
retval = tsadc->get_temp(sensor->id, thermal->regs, out_temp);
dev_dbg(&thermal->pdev->dev, "sensor %d - temp: %ld, retval: %d\n",
sensor->id, *out_temp, retval);
return retval;
}
static const struct thermal_zone_of_device_ops rockchip_of_thermal_ops = {
.get_temp = rockchip_thermal_get_temp,
};
static int rockchip_configure_from_dt(struct device *dev,
struct device_node *np,
struct rockchip_thermal_data *thermal)
{
u32 shut_temp, tshut_mode, tshut_polarity;
if (of_property_read_u32(np, "rockchip,hw-tshut-temp", &shut_temp)) {
dev_warn(dev,
"Missing tshut temp property, using default %ld\n",
thermal->chip->tshut_temp);
thermal->tshut_temp = thermal->chip->tshut_temp;
} else {
thermal->tshut_temp = shut_temp;
}
if (thermal->tshut_temp > INT_MAX) {
dev_err(dev, "Invalid tshut temperature specified: %ld\n",
thermal->tshut_temp);
return -ERANGE;
}
if (of_property_read_u32(np, "rockchip,hw-tshut-mode", &tshut_mode)) {
dev_warn(dev,
"Missing tshut mode property, using default (%s)\n",
thermal->chip->tshut_mode == TSHUT_MODE_GPIO ?
"gpio" : "cru");
thermal->tshut_mode = thermal->chip->tshut_mode;
} else {
thermal->tshut_mode = tshut_mode;
}
if (thermal->tshut_mode > 1) {
dev_err(dev, "Invalid tshut mode specified: %d\n",
thermal->tshut_mode);
return -EINVAL;
}
if (of_property_read_u32(np, "rockchip,hw-tshut-polarity",
&tshut_polarity)) {
dev_warn(dev,
"Missing tshut-polarity property, using default (%s)\n",
thermal->chip->tshut_polarity == TSHUT_LOW_ACTIVE ?
"low" : "high");
thermal->tshut_polarity = thermal->chip->tshut_polarity;
} else {
thermal->tshut_polarity = tshut_polarity;
}
if (thermal->tshut_polarity > 1) {
dev_err(dev, "Invalid tshut-polarity specified: %d\n",
thermal->tshut_polarity);
return -EINVAL;
}
return 0;
}
static int
rockchip_thermal_register_sensor(struct platform_device *pdev,
struct rockchip_thermal_data *thermal,
struct rockchip_thermal_sensor *sensor,
enum sensor_id id)
{
const struct rockchip_tsadc_chip *tsadc = thermal->chip;
int error;
tsadc->set_tshut_mode(id, thermal->regs, thermal->tshut_mode);
tsadc->set_tshut_temp(id, thermal->regs, thermal->tshut_temp);
sensor->thermal = thermal;
sensor->id = id;
sensor->tzd = thermal_zone_of_sensor_register(&pdev->dev, id, sensor,
&rockchip_of_thermal_ops);
if (IS_ERR(sensor->tzd)) {
error = PTR_ERR(sensor->tzd);
dev_err(&pdev->dev, "failed to register sensor %d: %d\n",
id, error);
return error;
}
return 0;
}
/*
* Reset TSADC Controller, reset all tsadc registers.
*/
static void rockchip_thermal_reset_controller(struct reset_control *reset)
{
reset_control_assert(reset);
usleep_range(10, 20);
reset_control_deassert(reset);
}
static int rockchip_thermal_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct rockchip_thermal_data *thermal;
const struct of_device_id *match;
struct resource *res;
int irq;
int i;
int error;
match = of_match_node(of_rockchip_thermal_match, np);
if (!match)
return -ENXIO;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "no irq resource?\n");
return -EINVAL;
}
thermal = devm_kzalloc(&pdev->dev, sizeof(struct rockchip_thermal_data),
GFP_KERNEL);
if (!thermal)
return -ENOMEM;
thermal->pdev = pdev;
thermal->chip = (const struct rockchip_tsadc_chip *)match->data;
if (!thermal->chip)
return -EINVAL;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
thermal->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(thermal->regs))
return PTR_ERR(thermal->regs);
thermal->reset = devm_reset_control_get(&pdev->dev, "tsadc-apb");
if (IS_ERR(thermal->reset)) {
error = PTR_ERR(thermal->reset);
dev_err(&pdev->dev, "failed to get tsadc reset: %d\n", error);
return error;
}
thermal->clk = devm_clk_get(&pdev->dev, "tsadc");
if (IS_ERR(thermal->clk)) {
error = PTR_ERR(thermal->clk);
dev_err(&pdev->dev, "failed to get tsadc clock: %d\n", error);
return error;
}
thermal->pclk = devm_clk_get(&pdev->dev, "apb_pclk");
if (IS_ERR(thermal->pclk)) {
error = PTR_ERR(thermal->pclk);
dev_err(&pdev->dev, "failed to get apb_pclk clock: %d\n",
error);
return error;
}
error = clk_prepare_enable(thermal->clk);
if (error) {
dev_err(&pdev->dev, "failed to enable converter clock: %d\n",
error);
return error;
}
error = clk_prepare_enable(thermal->pclk);
if (error) {
dev_err(&pdev->dev, "failed to enable pclk: %d\n", error);
goto err_disable_clk;
}
rockchip_thermal_reset_controller(thermal->reset);
error = rockchip_configure_from_dt(&pdev->dev, np, thermal);
if (error) {
dev_err(&pdev->dev, "failed to parse device tree data: %d\n",
error);
goto err_disable_pclk;
}
thermal->chip->initialize(thermal->regs, thermal->tshut_polarity);
error = rockchip_thermal_register_sensor(pdev, thermal,
&thermal->sensors[0],
SENSOR_CPU);
if (error) {
dev_err(&pdev->dev,
"failed to register CPU thermal sensor: %d\n", error);
goto err_disable_pclk;
}
error = rockchip_thermal_register_sensor(pdev, thermal,
&thermal->sensors[1],
SENSOR_GPU);
if (error) {
dev_err(&pdev->dev,
"failed to register GPU thermal sensor: %d\n", error);
goto err_unregister_cpu_sensor;
}
error = devm_request_threaded_irq(&pdev->dev, irq, NULL,
&rockchip_thermal_alarm_irq_thread,
IRQF_ONESHOT,
"rockchip_thermal", thermal);
if (error) {
dev_err(&pdev->dev,
"failed to request tsadc irq: %d\n", error);
goto err_unregister_gpu_sensor;
}
thermal->chip->control(thermal->regs, true);
for (i = 0; i < ARRAY_SIZE(thermal->sensors); i++)
rockchip_thermal_toggle_sensor(&thermal->sensors[i], true);
platform_set_drvdata(pdev, thermal);
return 0;
err_unregister_gpu_sensor:
thermal_zone_of_sensor_unregister(&pdev->dev, thermal->sensors[1].tzd);
err_unregister_cpu_sensor:
thermal_zone_of_sensor_unregister(&pdev->dev, thermal->sensors[0].tzd);
err_disable_pclk:
clk_disable_unprepare(thermal->pclk);
err_disable_clk:
clk_disable_unprepare(thermal->clk);
return error;
}
static int rockchip_thermal_remove(struct platform_device *pdev)
{
struct rockchip_thermal_data *thermal = platform_get_drvdata(pdev);
int i;
for (i = 0; i < ARRAY_SIZE(thermal->sensors); i++) {
struct rockchip_thermal_sensor *sensor = &thermal->sensors[i];
rockchip_thermal_toggle_sensor(sensor, false);
thermal_zone_of_sensor_unregister(&pdev->dev, sensor->tzd);
}
thermal->chip->control(thermal->regs, false);
clk_disable_unprepare(thermal->pclk);
clk_disable_unprepare(thermal->clk);
return 0;
}
static int __maybe_unused rockchip_thermal_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct rockchip_thermal_data *thermal = platform_get_drvdata(pdev);
int i;
for (i = 0; i < ARRAY_SIZE(thermal->sensors); i++)
rockchip_thermal_toggle_sensor(&thermal->sensors[i], false);
thermal->chip->control(thermal->regs, false);
clk_disable(thermal->pclk);
clk_disable(thermal->clk);
return 0;
}
static int __maybe_unused rockchip_thermal_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct rockchip_thermal_data *thermal = platform_get_drvdata(pdev);
int i;
int error;
error = clk_enable(thermal->clk);
if (error)
return error;
error = clk_enable(thermal->pclk);
if (error)
return error;
rockchip_thermal_reset_controller(thermal->reset);
thermal->chip->initialize(thermal->regs, thermal->tshut_polarity);
for (i = 0; i < ARRAY_SIZE(thermal->sensors); i++) {
enum sensor_id id = thermal->sensors[i].id;
thermal->chip->set_tshut_mode(id, thermal->regs,
thermal->tshut_mode);
thermal->chip->set_tshut_temp(id, thermal->regs,
thermal->tshut_temp);
}
thermal->chip->control(thermal->regs, true);
for (i = 0; i < ARRAY_SIZE(thermal->sensors); i++)
rockchip_thermal_toggle_sensor(&thermal->sensors[i], true);
return 0;
}
static SIMPLE_DEV_PM_OPS(rockchip_thermal_pm_ops,
rockchip_thermal_suspend, rockchip_thermal_resume);
static struct platform_driver rockchip_thermal_driver = {
.driver = {
.name = "rockchip-thermal",
.pm = &rockchip_thermal_pm_ops,
.of_match_table = of_rockchip_thermal_match,
},
.probe = rockchip_thermal_probe,
.remove = rockchip_thermal_remove,
};
module_platform_driver(rockchip_thermal_driver);
MODULE_DESCRIPTION("ROCKCHIP THERMAL Driver");
MODULE_AUTHOR("Rockchip, Inc.");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:rockchip-thermal");