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Date: Fri, 12 Apr 2013 17:02:22 +0530
From: amit daniel kachhap <amit.daniel@...sung.com>
To: Eduardo Valentin <eduardo.valentin@...com>
Cc: linux-pm@...r.kernel.org,
Thomas Abraham <thomas.abraham@...aro.org>,
Zhang Rui <rui.zhang@...el.com>,
linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
Kukjin Kim <kgene.kim@...sung.com>
Subject: Re: [7/9] thermal: exynos: Add support for exynos5440 TMU sensor.
Hi Eduardo,
On Fri, Apr 12, 2013 at 2:34 AM, Eduardo Valentin
<eduardo.valentin@...com> wrote:
>
> Amit,
>
>
> On 26-03-2013 07:34, Amit Daniel Kachhap wrote:
>>
>> This sensor registers 3 instance of the tmu controller with the thermal
>> zone
>> and hence reports 3 temperature output. This driver supports upto five
>> trip
>> points. For critical threshold the driver uses the core driver thermal
>> framework for shutdown and for non-critical threshold it invokes the hw
>> based
>> frequency clipping limits. Because of such differences with the existing
>> 4210
>> tmu controller, exynos5440 tmu driver is added in a new file.
>>
>> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
>>
>> ---
>> drivers/thermal/samsung/Kconfig | 9 +
>> drivers/thermal/samsung/Makefile | 1 +
>> drivers/thermal/samsung/exynos5440_thermal.c | 713
>> ++++++++++++++++++++++++++
>
>
> This driver does not compile as module:
> ERROR: "exynos_report_trigger"
> [drivers/thermal/samsung/exynos5440_thermal.ko] undefined!
> ERROR: "exynos_get_frequency_level"
> [drivers/thermal/samsung/exynos5440_thermal.ko] undefined!
> ERROR: "exynos_unregister_thermal"
> [drivers/thermal/samsung/exynos5440_thermal.ko] undefined!
Ok will fix it.
>
>
> Besides, this driver is pretty similar to 4210 driver. Are you you cannot
> isolate the difference into config data? Again, check the driver design for
> TI SoC thermal (drivers/staging/ti-soc-thermal/ on linux-next)
Yes I started with a 4210 file and srarted modifying it but then lot
of conditional code started getting inserted and it become very
complex. So I splitted this file itself. Will check your
implementation.
Thanks,
Amit Daniel
>
>
>> 3 files changed, 723 insertions(+), 0 deletions(-)
>> create mode 100644 drivers/thermal/samsung/exynos5440_thermal.c
>>
>> diff --git a/drivers/thermal/samsung/Kconfig
>> b/drivers/thermal/samsung/Kconfig
>> index cefe693..0c7b4eb 100644
>> --- a/drivers/thermal/samsung/Kconfig
>> +++ b/drivers/thermal/samsung/Kconfig
>> @@ -20,4 +20,13 @@ config EXYNOS4210_THERMAL
>> initialises the TMU controller and registers/unregisters with
>> exynos
>> common thermal layer.
>>
>> +config EXYNOS5440_THERMAL
>> + tristate "Temperature sensor on Samsung EXYNOS 5440 SOC"
>> + depends on SOC_EXYNOS5440
>> + help
>> + If you say yes here you can enable TMU (Thermal Management Unit)
>> + support on SAMSUNG EXYNOS 5440 series of SoC. This option
>> initialises
>> + the TMU controller and registers/unregisters with exynos common
>> + thermal layer.
>> +
>> endif
>> diff --git a/drivers/thermal/samsung/Makefile
>> b/drivers/thermal/samsung/Makefile
>> index d51d0c2..53230cf 100644
>> --- a/drivers/thermal/samsung/Makefile
>> +++ b/drivers/thermal/samsung/Makefile
>> @@ -3,3 +3,4 @@
>> #
>> obj-$(CONFIG_EXYNOS_COMMON) += exynos_common.o
>> obj-$(CONFIG_EXYNOS4210_THERMAL) += exynos4210_thermal.o
>> +obj-$(CONFIG_EXYNOS5440_THERMAL) += exynos5440_thermal.o
>> diff --git a/drivers/thermal/samsung/exynos5440_thermal.c
>> b/drivers/thermal/samsung/exynos5440_thermal.c
>> new file mode 100644
>> index 0000000..a3c75d3
>> --- /dev/null
>> +++ b/drivers/thermal/samsung/exynos5440_thermal.c
>> @@ -0,0 +1,713 @@
>> +/*
>> + * exynos5440_thermal.c - Samsung EXYNOS 5440 TMU
>> + * (Thermal Management Unit)
>> + *
>> + * Copyright (C) 2013 Samsung Electronics
>> + * Amit Daniel Kachhap <amit.daniel@...sung.com>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that 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.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program; if not, write to the Free Software
>> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
>> USA
>> + *
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/cpufreq.h>
>> +#include <linux/cpu_cooling.h>
>> +#include <linux/err.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/kernel.h>
>> +#include <linux/kobject.h>
>> +#include <linux/module.h>
>> +#include <linux/mutex.h>
>> +#include <linux/of.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/slab.h>
>> +#include <linux/thermal.h>
>> +#include <linux/workqueue.h>
>> +#include <linux/platform_data/exynos_thermal.h>
>> +
>> +#include "exynos_common.h"
>> +
>> +
>> +/* Exynos5440 specific registers */
>> +#define TMU_S0_7_TRIM 0x0118
>> +#define TMU_S0_7_CTRL 0x0138
>> +#define TMU_S0_7_DEBUG 0x0158
>> +#define TMU_S0_7_STATUS 0x0178
>> +#define TMU_S0_7_COUNTER0 0x0198
>> +#define TMU_S0_7_COUNTER1 0x01b8
>> +#define TMU_S0_7_COUNTER2 0x01d8
>> +#define TMU_S0_7_COUNTER3 0x01f8
>> +#define TMU_S0_7_TEMP 0x0208
>> +#define TMU_S0_7_TH0 0x0228
>> +#define TMU_S0_7_TH1 0x0248
>> +#define TMU_S0_7_TH2 0x0268
>> +#define TMU_S0_7_PTEMP0 0x0288
>> +#define TMU_S0_7_PTEMP1 0x02a8
>> +#define TMU_S0_7_PTEMP2 0x02c8
>> +#define TMU_S0_7_PTEMP3 0x02e8
>> +#define TMU_S0_7_EVTEN 0x0308
>> +#define TMU_S0_7_IRQEN 0x0328
>> +#define TMU_S0_7_IRQ 0x0348
>> +#define TMU_IRQ_STATUS 0x0368
>> +#define TMU_PMIN 0x036c
>> +#define TMU_TEMP 0x0370
>> +#define TMU_MISC 0x0374
>> +
>> +/* Exynos5440 specific mask and shifts */
>> +#define TMU_TEMP_MASK 0xff
>> +
>> +#define TMU_TRIM_DATA_25C_SHIFT 0x0
>> +#define TMU_TRIM_DATA_85C_SHIFT 0x8
>> +
>> +#define TMU_BUF_VREF_SEL_MASK 0x1f
>> +#define TMU_BUF_VREF_SEL_SHIFT 24
>> +#define TMU_THERM_TRIP_MODE_MASK 0x7
>> +#define TMU_THERM_TRIP_MODE_SHIFT 13
>> +#define TMU_THERM_TRIP_EN_SHIFT 12
>> +#define TMU_BUF_SLOPE_SEL_MASK 0Xf
>> +#define TMU_BUF_SLOPE_SEL_SHIFT 8
>> +#define TMU_THERM_IRQ_MODE_SHIFT 7
>> +#define TMU_CALIB_MODE_MASK 0x3
>> +#define TMU_CALIB_MODE_SHIFT 4
>> +#define TMU_FILTER_MODE_MASK 0x7
>> +#define TMU_FILTER_MODE_SHIFT 1
>> +#define TMU_SENSOR_EN_SHIFT 0
>> +#define TMU_SENSOR_ENABLE 0x1
>> +
>> +#define TMU_EMU_EN_SHIFT 0
>> +#define TMU_TEMP_EMU_SHIFT 8
>> +#define TMU_EMUL_ENABLE 1
>> +
>> +#define TMU_STATUS_IDLE_SHIFT 0
>> +
>> +#define TMU_TIME_MASK 0xffff
>> +#define TMU_TIME_OF_SHIFT 16
>> +#define TMU_TIME_ON_SHIFT 0
>> +
>> +#define TMU_CURRENT_TEMP_SHIFT 0
>> +#define TMU_FILTERED_TEMP_SHIFT 8
>> +#define TMU_RAW_TEMP_SHIFT 16
>> +#define TMU_TEMP_SEQNUM 24
>> +
>> +#define TMU_THRES_RISE0_SHIFT 0
>> +#define TMU_THRES_RISE1_SHIFT 8
>> +#define TMU_THRES_RISE2_SHIFT 16
>> +#define TMU_THRES_RISE3_SHIFT 24
>> +
>> +#define TMU_THRES_FALL0_SHIFT 0
>> +#define TMU_THRES_FALL1_SHIFT 8
>> +#define TMU_THRES_FALL2_SHIFT 16
>> +#define TMU_THRES_FALL3_SHIFT 24
>> +
>> +#define TMU_THRES_RISE4_SHIFT 24
>> +
>> +#define TMU_RISE_EVTEN_MASK 0xf
>> +#define TMU_RISE_EVTEN_SHIFT 0
>> +#define TMU_FALL_EVTEN_MASK 0xf
>> +#define TMU_FALL_EVTEN_SHIFT 4
>> +
>> +#define TMU_RISE_IRQEN_MASK 0xf
>> +#define TMU_RISE_IRQEN_SHIFT 0
>> +#define TMU_FALL_IRQEN_MASK 0xf
>> +#define TMU_FALL_IRQEN_SHIFT 4
>> +#define TMU_CLEAR_RISE_INT TMU_RISE_IRQEN_MASK
>> +#define TMU_CLEAR_FALL_INT (TMU_FALL_IRQEN_MASK << 4)
>> +
>> +#define TMU_PMIN_MASK 0x7
>> +#define TMU_PMIN0_SHIFT 0
>> +#define TMU_PMIN1_SHIFT 4
>> +#define TMU_PMIN2_SHIFT 8
>> +#define TMU_PMIN3_SHIFT 12
>> +#define TMU_PMIN_SHIFT(x) (4 * x)
>> +#define TMU_TPMIN_SHIFT 16
>> +
>> +#define TMU_TEMP_MAX_SHIFT 0
>> +#define TMU_MAX_RISE_LEVEL 4
>> +#define TMU_MAX_FALL_LEVEL 4
>> +#define TMU_MAX_SENSOR 8
>> +
>> +#define TMU_DEF_CODE_TO_TEMP_OFFSET 20
>> +
>> +struct exynos_tmu_data {
>> + int irq;
>> + int id;
>> + unsigned int shift;
>> + enum soc_type soc;
>> + void __iomem *base;
>> + struct clk *clk;
>> + struct work_struct irq_work;
>> + u8 temp_error1, temp_error2;
>> + struct mutex lock;
>> + struct thermal_sensor_conf *reg_conf;
>> + struct exynos_tmu_platform_data *pdata;
>> +};
>> +
>> +struct exynos_tmu_common {
>> + int level[TMU_MAX_SENSOR];
>> + int sensor_count;
>> +};
>> +static struct exynos_tmu_common tmu_common;
>> +/*
>> + * TMU treats temperature as a mapped temperature code.
>> + * The temperature is converted differently depending on the calibration
>> type.
>> + */
>> +static int temp_to_code(struct exynos_tmu_data *data, u8 temp)
>> +{
>> + struct exynos_tmu_platform_data *pdata = data->pdata;
>> + int temp_code;
>> +
>> + if (pdata->cal_mode == HW_MODE)
>> + return temp;
>> +
>> + switch (pdata->cal_type) {
>> + case TYPE_TWO_POINT_TRIMMING:
>> + temp_code = (temp - 25) *
>> + (data->temp_error2 - data->temp_error1) /
>> + (70 - 25) + data->temp_error1;
>> + break;
>> + case TYPE_ONE_POINT_TRIMMING:
>> + temp_code = temp + data->temp_error1 - 25;
>> + break;
>> + default:
>> + temp_code = temp + TMU_DEF_CODE_TO_TEMP_OFFSET;
>> + break;
>> + }
>> +
>> + return temp_code;
>> +}
>> +
>> +/*
>> + * Calculate a temperature value from a temperature code.
>> + * The unit of the temperature is degree Celsius.
>> + */
>> +static int code_to_temp(struct exynos_tmu_data *data, u8 temp_code)
>> +{
>> + struct exynos_tmu_platform_data *pdata = data->pdata;
>> + int temp;
>> +
>> + if (pdata->cal_mode == HW_MODE)
>> + return temp_code;
>> +
>> + switch (pdata->cal_type) {
>> + case TYPE_TWO_POINT_TRIMMING:
>> + temp = (temp_code - data->temp_error1) * (70 - 25) /
>> + (data->temp_error2 - data->temp_error1) + 25;
>> + break;
>> + case TYPE_ONE_POINT_TRIMMING:
>> + temp = temp_code - data->temp_error1 + 25;
>> + break;
>> + default:
>> + temp = temp_code - TMU_DEF_CODE_TO_TEMP_OFFSET;
>> + break;
>> + }
>> +
>> + return temp;
>> +}
>> +
>> +static int exynos_tmu_initialize(struct platform_device *pdev)
>> +{
>> + struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>> + struct exynos_tmu_platform_data *pdata = data->pdata;
>> + unsigned int status, con, trim_info;
>> + unsigned int rising_threshold = 0, falling_threshold = 0;
>> + int ret = 0, threshold_code, i, trigger_levs = 0;
>> +
>> + status = readl(data->base + data->shift + TMU_S0_7_STATUS);
>> + status &= 0x1;
>> + if (!status)
>> + dev_err(&pdev->dev, "Sensor Initial status is busy\n");
>> +
>> + if (pdata->cal_mode == HW_MODE)
>> + goto skip_calib_data;
>> +
>> + /* Save trimming info in order to perform calibration */
>> + trim_info = readl(data->base + data->shift + TMU_S0_7_TRIM);
>> + data->temp_error1 = trim_info & TMU_TEMP_MASK;
>> + data->temp_error2 = ((trim_info >> 8) & TMU_TEMP_MASK);
>> + if (!data->temp_error1)
>> + data->temp_error1 = pdata->efuse_value & TMU_TEMP_MASK;
>> + if (!data->temp_error2)
>> + data->temp_error2 = (pdata->efuse_value >> 8) &
>> TMU_TEMP_MASK;
>> +
>> +skip_calib_data:
>> + /* Count trigger levels to be enabled */
>> + for (i = 0; i < MAX_THRESHOLD_LEVS; i++)
>> + if (pdata->trigger_levels[i])
>> + trigger_levs++;
>> +
>> + /* Write temperature code for rising and falling threshold */
>> + for (i = 0; (i < trigger_levs && i < TMU_MAX_RISE_LEVEL); i++) {
>> + threshold_code = temp_to_code(data,
>> + pdata->trigger_levels[i]);
>> + if (threshold_code < 0) {
>> + ret = threshold_code;
>> + dev_err(&pdev->dev, "Invalid threshold=%d
>> level=%d\n",
>> + threshold_code,
>> i);
>> + goto out;
>> + }
>> + rising_threshold |= threshold_code << 8 * i;
>> + if (pdata->threshold_falling) {
>> + threshold_code = temp_to_code(data,
>> + pdata->trigger_levels[i] -
>> + pdata->threshold_falling);
>> + if (threshold_code > 0)
>> + falling_threshold |=
>> + threshold_code << 8 * i;
>> + }
>> + }
>> + writel(rising_threshold,
>> + data->base + data->shift + TMU_S0_7_TH0);
>> + writel(falling_threshold,
>> + data->base + data->shift + TMU_S0_7_TH1);
>> +
>> + /* if 5th threshold limit is also present */
>> + if (i == TMU_MAX_RISE_LEVEL) {
>> + threshold_code = temp_to_code(data,
>> + pdata->trigger_levels[i]);
>> + if (threshold_code < 0) {
>> + ret = threshold_code;
>> + dev_err(&pdev->dev, "Invalid threshold=%d
>> level=%d\n",
>> + threshold_code,
>> i);
>> + goto out;
>> + }
>> + rising_threshold = threshold_code <<
>> TMU_THRES_RISE4_SHIFT;
>> + writel(rising_threshold,
>> + data->base + data->shift + TMU_S0_7_TH2);
>> + con = readl(data->base + data->shift + TMU_S0_7_CTRL);
>> + con |= (1 << TMU_THERM_TRIP_EN_SHIFT);
>> + writel(con, data->base + data->shift + TMU_S0_7_CTRL);
>> + }
>> +
>> + writel(TMU_CLEAR_RISE_INT | TMU_CLEAR_FALL_INT,
>> + data->base + data->shift + TMU_S0_7_IRQ);
>> +
>> + /* clear all PMIN */
>> + writel(0, data->base + TMU_PMIN);
>> +out:
>> + return ret;
>> +}
>> +
>> +static void exynos_tmu_control(struct platform_device *pdev, bool on)
>> +{
>> + struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>> + struct exynos_tmu_platform_data *pdata = data->pdata;
>> + unsigned int con, interrupt_en;
>> +
>> + mutex_lock(&data->lock);
>> + con = readl(data->base + data->shift + TMU_S0_7_CTRL);
>> + con &= ~(TMU_BUF_VREF_SEL_MASK << TMU_BUF_VREF_SEL_SHIFT |
>> + TMU_THERM_TRIP_MODE_MASK << TMU_THERM_TRIP_MODE_SHIFT |
>> + TMU_BUF_SLOPE_SEL_MASK << TMU_BUF_SLOPE_SEL_SHIFT |
>> + TMU_CALIB_MODE_MASK << TMU_CALIB_MODE_SHIFT |
>> + TMU_FILTER_MODE_MASK << TMU_FILTER_MODE_SHIFT |
>> + TMU_SENSOR_ENABLE << TMU_SENSOR_EN_SHIFT);
>> +
>> + con |= pdata->reference_voltage << TMU_BUF_VREF_SEL_SHIFT |
>> + pdata->gain << TMU_BUF_SLOPE_SEL_SHIFT;
>> +
>> + if (pdata->cal_mode == HW_MODE)
>> + con |= pdata->cal_type << TMU_CALIB_MODE_SHIFT;
>> +
>> + con |= pdata->noise_cancel_mode << TMU_THERM_TRIP_MODE_SHIFT;
>> +
>> + if (on) {
>> + con |= TMU_SENSOR_ENABLE;
>> + interrupt_en =
>> + pdata->trigger_enable[3] << 3 |
>> + pdata->trigger_enable[2] << 2 |
>> + pdata->trigger_enable[1] << 1 |
>> + pdata->trigger_enable[0] << 0;
>> + if (pdata->threshold_falling)
>> + interrupt_en |= interrupt_en <<
>> TMU_FALL_IRQEN_SHIFT;
>> + } else {
>> + interrupt_en = 0; /* Disable all interrupts */
>> + }
>> + writel(interrupt_en, data->base + data->shift + TMU_S0_7_IRQEN);
>> + writel(interrupt_en, data->base + data->shift + TMU_S0_7_EVTEN);
>> + writel(con, data->base + data->shift + TMU_S0_7_CTRL);
>> +
>> + mutex_unlock(&data->lock);
>> +}
>> +
>> +static int exynos_tmu_read(struct exynos_tmu_data *data)
>> +{
>> + u8 temp_code;
>> + int temp;
>> +
>> + mutex_lock(&data->lock);
>
>
> Dont you need to enable clocks?
>
>
>> +
>> + temp_code = readl(data->base + data->shift + TMU_S0_7_TEMP);
>> + temp_code >>= TMU_CURRENT_TEMP_SHIFT;
>> + temp_code &= TMU_TEMP_MASK;
>> + temp = code_to_temp(data, temp_code);
>> +
>> + mutex_unlock(&data->lock);
>> +
>> + return temp;
>> +}
>> +
>> +#ifdef CONFIG_THERMAL_EMULATION
>> +static int exynos_tmu_set_emulation(struct exynos_tmu_data *data,
>> + unsigned long temp)
>> +{
>> + unsigned int reg;
>> +
>> + if (temp && temp < MCELSIUS)
>> + goto out;
>> +
>> + mutex_lock(&data->lock);
>> + reg = readl(data->base + data->shift + TMU_S0_7_DEBUG);
>> +
>> + if (temp) {
>> + temp /= MCELSIUS;
>> + reg &= ~(TMU_TEMP_MASK << TMU_TEMP_EMU_SHIFT);
>> + reg |= (temp_to_code(data, temp) << TMU_TEMP_EMU_SHIFT) |
>> + TMU_EMUL_ENABLE;
>> + } else {
>> + reg &= ~TMU_EMUL_ENABLE;
>> + }
>> +
>> + writel(reg, data->base + data->shift + TMU_S0_7_DEBUG);
>> + mutex_unlock(&data->lock);
>> + return 0;
>> +out:
>> + return -EINVAL;
>> +}
>> +#endif
>> +
>> +static void exynos_tmu_set_cooling(struct exynos_tmu_data *data, int
>> level,
>> + unsigned int cur_temp)
>> +{
>> + struct exynos_tmu_platform_data *pdata = data->pdata;
>> + bool check_rise, change;
>> + unsigned int thres_temp, freq = 0, val;
>> + int i, index, max_level = 0;
>> +
>> + /* Get the max level across all sensors except this */
>> + for (i = 0; i < tmu_common.sensor_count; i++) {
>> + if (i == data->id)
>> + continue;
>> + if (tmu_common.level[i] > max_level)
>> + max_level = tmu_common.level[i];
>> + }
>> + change = false;
>> + if (level < TMU_MAX_RISE_LEVEL) {
>> + thres_temp = readl(data->base + data->shift +
>> TMU_S0_7_TH0);
>> + thres_temp = (thres_temp >> (level * 8) & TMU_TEMP_MASK);
>> + check_rise = true;
>> + tmu_common.level[data->id] = level + 1;
>> + if (tmu_common.level[data->id] > max_level)
>> + change = true;
>> + } else {
>> + level -= TMU_MAX_RISE_LEVEL;
>> + thres_temp = readl(data->base + data->shift +
>> TMU_S0_7_TH1);
>> + thres_temp = (thres_temp >> (level * 8) & TMU_TEMP_MASK);
>> + check_rise = false;
>> + tmu_common.level[data->id] = level;
>> + if (tmu_common.level[data->id] >= max_level)
>> + change = true;
>> + }
>> +
>> + if (change == false)
>> + return;
>> +
>> + thres_temp = code_to_temp(data, thres_temp);
>> + if (!check_rise)
>> + thres_temp += pdata->threshold_falling;
>> +
>> + change = false;
>> + /* find this threshold temp in the patform table cooling data */
>> + for (i = 0; i < pdata->freq_tab_count; i++) {
>> + if (thres_temp != pdata->freq_tab[i].temp_level)
>> + continue;
>> +
>> + if (check_rise && cur_temp >= thres_temp) {
>> + freq = pdata->freq_tab[i].freq_clip_max;
>> + change = true;
>> + }
>> + if (!check_rise &&
>> + (cur_temp <= (thres_temp - pdata->threshold_falling))) {
>> + change = true;
>> + freq = 0;
>> + }
>> + }
>> +
>> + /* critical threshold temp */
>> + if (thres_temp == pdata->trigger_levels[TMU_MAX_RISE_LEVEL - 1])
>> + exynos_report_trigger(data->reg_conf);
>> +
>> + if (change == false)
>> + return;
>> +
>> + index = 0;
>> +
>> + if (freq) {
>> + index = exynos_get_frequency_level(0, freq);
>> + if (index < 0)
>> + return;
>> + }
>> +
>> + val = readl(data->base + TMU_PMIN);
>> + val &= (~(TMU_PMIN_MASK << TMU_PMIN_SHIFT(level)));
>> + val |= (index << TMU_PMIN_SHIFT(level));
>> + writel(val, data->base + TMU_PMIN);
>> +}
>> +
>> +static void exynos_tmu_work(struct work_struct *work)
>> +{
>> + struct exynos_tmu_data *data = container_of(work,
>> + struct exynos_tmu_data, irq_work);
>> + int i, cur_temp;
>> + unsigned int val_type, val_irq;
>> +
>> + if (!data)
>> + goto out;
>> +
>> + val_type = readl(data->base + TMU_IRQ_STATUS);
>> +
>> + /* Find which sensor generated this interrupt */
>> + if (!((val_type >> data->id) & 0x1))
>> + goto out;
>> +
>> + cur_temp = exynos_tmu_read(data);
>> + val_irq = readl(data->base + data->shift + TMU_S0_7_IRQ);
>> + for (i = 0; i < (TMU_MAX_RISE_LEVEL + TMU_MAX_FALL_LEVEL); i++) {
>> + if (!((val_irq >> i) & 0x1))
>> + continue;
>> + exynos_tmu_set_cooling(data, i, cur_temp);
>> + }
>> + /* clear the interrupts */
>> + writel(val_irq, data->base + data->shift + TMU_S0_7_IRQ);
>> +out:
>> + enable_irq(data->irq);
>> +}
>> +
>> +static irqreturn_t exynos_tmu_irq(int irq, void *id)
>> +{
>> + struct exynos_tmu_data *data = id;
>> +
>> + disable_irq_nosync(irq);
>> + schedule_work(&data->irq_work);
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static const struct of_device_id exynos_tmu_match[] = {
>> + {
>> + .compatible = "samsung,exynos5440-tmu",
>> + },
>> + {},
>> +};
>> +MODULE_DEVICE_TABLE(of, exynos_tmu_match);
>> +
>> +int exynos_map_dt_data(struct platform_device *pdev)
>> +{
>> + struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>> + struct resource res;
>> +
>> + if (!data)
>> + return -ENODEV;
>> +
>> + data->id = of_alias_get_id(pdev->dev.of_node, "tmuctrl");
>> + if (data->id < 0)
>> + data->id = 0;
>> +
>> + data->shift = data->id * 4;
>> +
>> + data->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
>> + if (data->irq <= 0) {
>> + dev_err(&pdev->dev, "failed to get IRQ\n");
>> + return -ENODEV;
>> + }
>> +
>> + if (of_address_to_resource(pdev->dev.of_node, 0, &res)) {
>> + dev_err(&pdev->dev, "failed to get Resource\n");
>> + return -ENODEV;
>> + }
>> +
>> + /* clear the last 16 bytes */
>> + res.start &= (~(0xFFFF));
>> + data->base = devm_ioremap(&pdev->dev, res.start,
>> resource_size(&res));
>> + if (!data->base) {
>> + dev_err(&pdev->dev, "Failed to ioremap memory\n");
>> + return -ENOMEM;
>> + }
>> + return 0;
>> +}
>> +
>> +static int exynos_tmu_probe(struct platform_device *pdev)
>> +{
>> + struct exynos_tmu_data *data;
>> + struct exynos_tmu_platform_data *pdata;
>> + struct thermal_sensor_conf *sensor_conf;
>> + int ret, i;
>> +
>> + data = devm_kzalloc(&pdev->dev, sizeof(struct exynos_tmu_data),
>> + GFP_KERNEL);
>> + if (!data) {
>> + dev_err(&pdev->dev, "Failed to allocate driver
>> structure\n");
>> + return -ENOMEM;
>> + }
>> +
>> + pdata = (struct exynos_tmu_platform_data *)
>> + platform_get_device_id(pdev)->driver_data;
>> + if (!pdata) {
>> + dev_err(&pdev->dev, "No platform init data supplied.\n");
>> + return -ENODEV;
>> + }
>> +
>> + data->pdata = pdata;
>> + platform_set_drvdata(pdev, data);
>> +
>> + ret = exynos_map_dt_data(pdev);
>> + if (ret)
>> + goto unset_data;
>> +
>> + INIT_WORK(&data->irq_work, exynos_tmu_work);
>> +
>> + ret = devm_request_irq(&pdev->dev, data->irq, exynos_tmu_irq,
>> + IRQF_TRIGGER_RISING|IRQF_SHARED, dev_name(&pdev->dev),
>> data);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Failed to request irq: %d\n",
>> data->irq);
>> + goto unset_data;
>> + }
>> +
>> + data->clk = of_clk_get(pdev->dev.of_node, 0);
>> + if (IS_ERR(data->clk)) {
>> + dev_err(&pdev->dev, "Failed to get tmu clock\n");
>> + ret = PTR_ERR(data->clk);
>> + goto unset_data;
>> + }
>> + clk_enable(data->clk);
>> +
>
>
> hmmm ok, you want it to be always running, right?
>
>
>> + mutex_init(&data->lock);
>> +
>> + ret = exynos_tmu_initialize(pdev);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Failed to initialize TMU\n");
>> + goto err_clk;
>> + }
>> +
>> + exynos_tmu_control(pdev, true);
>> +
>> + /* Allocate a structure to register with the exynos core thermal
>> */
>> + sensor_conf = devm_kzalloc(&pdev->dev,
>> + sizeof(struct thermal_sensor_conf),
>> GFP_KERNEL);
>> + if (!sensor_conf) {
>> + dev_err(&pdev->dev, "Failed to allocate registration
>> struct\n");
>> + ret = -ENOMEM;
>> + goto err_clk;
>> + }
>> + data->reg_conf = sensor_conf;
>> + sprintf(sensor_conf->name, "therm_zone%d", data->id);
>> + sensor_conf->read_temperature = (int (*)(void *))exynos_tmu_read;
>> +#ifdef CONFIG_THERMAL_EMULATION
>> + sensor_conf->write_emul_temp =
>> + (int (*)(void *, unsigned long))exynos_tmu_set_emulation;
>> +#endif
>
>
> Do you really need this ifdef here? Cant you do same as you have done for
> 4210?
>
>
>> + sensor_conf->driver_data = data;
>> + sensor_conf->trip_data.trip_count = pdata->trigger_enable[0] +
>> + pdata->trigger_enable[1] +
>> pdata->trigger_enable[2] +
>> + pdata->trigger_enable[3];
>> +
>> + for (i = 0; i < sensor_conf->trip_data.trip_count; i++)
>> + sensor_conf->trip_data.trip_val[i] =
>> pdata->trigger_levels[i];
>> +
>> + sensor_conf->trip_data.trigger_falling = pdata->threshold_falling;
>> +
>> + /* Register the sensor with thermal management interface */
>> + ret = exynos_register_thermal(sensor_conf);
>> + if (ret) {
>> + dev_err(&pdev->dev, "Failed to register thermal
>> interface\n");
>> + goto err_clk;
>> + }
>> + tmu_common.sensor_count++;
>> + return 0;
>> +err_clk:
>> + clk_disable(data->clk);
>> + clk_put(data->clk);
>> +unset_data:
>> + platform_set_drvdata(pdev, NULL);
>> + return ret;
>> +}
>> +
>> +static int exynos_tmu_remove(struct platform_device *pdev)
>> +{
>> + struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>> + struct thermal_sensor_conf *sensor_conf = data->reg_conf;
>> +
>> + exynos_tmu_control(pdev, false);
>> + clk_disable(data->clk);
>> +
>> + exynos_unregister_thermal(sensor_conf);
>> +
>> + clk_put(data->clk);
>> +
>> + platform_set_drvdata(pdev, NULL);
>> +
>> + return 0;
>> +}
>> +
>> +#ifdef CONFIG_PM_SLEEP
>> +static int exynos_tmu_suspend(struct device *dev)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>> +
>> + exynos_tmu_control(pdev, false);
>> + clk_disable(data->clk);
>> +
>> + return 0;
>> +}
>> +
>> +static int exynos_tmu_resume(struct device *dev)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>> +
>> + clk_enable(data->clk);
>> + exynos_tmu_initialize(pdev);
>> + exynos_tmu_control(pdev, true);
>> +
>> + return 0;
>> +}
>> +
>> +static SIMPLE_DEV_PM_OPS(exynos_tmu_pm,
>> + exynos_tmu_suspend, exynos_tmu_resume);
>> +#define EXYNOS_TMU_PM (&exynos_tmu_pm)
>> +#else
>> +#define EXYNOS_TMU_PM NULL
>> +#endif
>> +
>> +static struct platform_driver exynos_tmu_driver = {
>> + .driver = {
>> + .name = "exynos5440-tmu",
>> + .owner = THIS_MODULE,
>> + .pm = EXYNOS_TMU_PM,
>> + .of_match_table = exynos_tmu_match,
>> + },
>> + .probe = exynos_tmu_probe,
>> + .remove = exynos_tmu_remove,
>> +};
>> +
>> +module_platform_driver(exynos_tmu_driver);
>> +
>> +MODULE_DESCRIPTION("EXYNOS5440 TMU Driver");
>> +MODULE_AUTHOR("Amit Daniel<amit.daniel@...sung.com>");
>> +MODULE_LICENSE("GPL");
>
> GPL v2?
>
>> +MODULE_ALIAS("platform:exynos5440-tmu");
>>
>
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