[RFC PATCH 09/11] ARM: OMAP4+: thermal: introduce bandgap temperature sensor
Cousson, Benoit
b-cousson at ti.com
Fri May 25 11:49:44 EDT 2012
On 5/25/2012 10:25 AM, Eduardo Valentin wrote:
> In the System Control Module, OMAP supplies a voltage reference
> and a temperature sensor feature that are gathered in the band
> gap voltage and temperature sensor (VBGAPTS) module. The band
> gap provides current and voltage reference for its internal
> circuits and other analog IP blocks. The analog-to-digital
> converter (ADC) produces an output value that is proportional
> to the silicon temperature.
>
> This patch provides a platform driver which expose this feature.
> It is moduled as a MFD child of the System Control Module core
> MFD driver.
>
> This driver provides only APIs to access the device properties,
> like temperature, thresholds and update rate.
>
> Signed-off-by: Eduardo Valentin<eduardo.valentin at ti.com>
> Signed-off-by: Keerthy<j-keerthy at ti.com>
> ---
> .../devicetree/bindings/thermal/omap_bandgap.txt | 27 +
> drivers/thermal/Kconfig | 13 +
> drivers/thermal/Makefile | 4 +-
> drivers/thermal/omap-bandgap.c | 1601 ++++++++++++++++++++
> drivers/thermal/omap-bandgap.h | 63 +
> 5 files changed, 1707 insertions(+), 1 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/thermal/omap_bandgap.txt
> create mode 100644 drivers/thermal/omap-bandgap.c
> create mode 100644 drivers/thermal/omap-bandgap.h
>
> diff --git a/Documentation/devicetree/bindings/thermal/omap_bandgap.txt b/Documentation/devicetree/bindings/thermal/omap_bandgap.txt
> new file mode 100644
> index 0000000..430bcf8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/thermal/omap_bandgap.txt
> @@ -0,0 +1,27 @@
> +* Texas Instrument OMAP SCM bandgap bindings
> +
> +In the System Control Module, OMAP supplies a voltage reference
> +and a temperature sensor feature that are gathered in the band
> +gap voltage and temperature sensor (VBGAPTS) module. The band
> +gap provides current and voltage reference for its internal
> +circuits and other analog IP blocks. The analog-to-digital
> +converter (ADC) produces an output value that is proportional
> +to the silicon temperature.
> +
> +Required properties:
> +- compatible : Should be:
> + - "ti,omap4460-control-bandgap" : for OMAP4460 bandgap
> + - "ti,omap5430-control-bandgap" : for OMAP5430 bandgap
> +- interrupts : this entry should indicate which interrupt line
> +the talert signal is routed to;
> +Specific:
> +- ti,tshut-gpio : this entry should be used to inform which GPIO
> +line the tshut signal is routed to;
> +
> +Example:
> +
> +bandgap {
> + compatible = "ti,omap4460-control-bandgap";
> + interrupts =<0 126 4>; /* talert */
> + ti,tshut-gpio =<86>;
> +};
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 514a691..ffdd240 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -26,3 +26,16 @@ config SPEAR_THERMAL
> help
> Enable this to plug the SPEAr thermal sensor driver into the Linux
> thermal framework
> +
> +config OMAP_BANDGAP
> + tristate "Texas Instruments OMAP4+ temperature sensor driver"
> + depends on THERMAL
> + depends on MFD_OMAP_CONTROL
> + help
> + If you say yes here you get support for the Texas Instruments
> + OMAP4460+ on die bandgap temperature sensor support. The register
> + set is part of system control module.
> +
> + This includes alert interrupts generation and also the TSHUT
> + support.
> +
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index a9fff0b..5ff1af1 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -3,4 +3,6 @@
> #
>
> obj-$(CONFIG_THERMAL) += thermal_sys.o
> -obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
> \ No newline at end of file
> +obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
> +obj-$(CONFIG_OMAP_BANDGAP) += omap-thermal.o
> +omap-thermal-y := omap-bandgap.o
> diff --git a/drivers/thermal/omap-bandgap.c b/drivers/thermal/omap-bandgap.c
> new file mode 100644
> index 0000000..3d5a12b
> --- /dev/null
> +++ b/drivers/thermal/omap-bandgap.c
> @@ -0,0 +1,1601 @@
> +/*
> + * OMAP4 Bandgap temperature sensor driver
> + *
> + * Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/
> + * Author: J Keerthy<j-keerthy at ti.com>
> + * Author: Moiz Sonasath<m-sonasath at ti.com>
> + * Couple of fixes, DT and MFD adaptation:
> + * Eduardo Valentin<eduardo.valentin at ti.com>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * 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., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + */
> +
> +#include<linux/module.h>
> +#include<linux/export.h>
> +#include<linux/init.h>
> +#include<linux/kernel.h>
> +#include<linux/interrupt.h>
> +#include<linux/clk.h>
> +#include<linux/gpio.h>
> +#include<linux/platform_device.h>
> +#include<linux/err.h>
> +#include<linux/types.h>
> +#include<linux/mutex.h>
> +#include<linux/reboot.h>
> +#include<linux/of_platform.h>
> +#include<linux/of_irq.h>
> +#include<linux/mfd/omap_control.h>
> +
> +#include<mach/control.h>
> +
> +#include "omap-bandgap.h"
> +
> +/* Offsets from the base of temperature sensor registers */
> +
> +#define OMAP4460_TEMP_SENSOR_CTRL_OFFSET 0x32C
> +#define OMAP4460_BGAP_CTRL_OFFSET 0x378
> +#define OMAP4460_BGAP_COUNTER_OFFSET 0x37C
> +#define OMAP4460_BGAP_THRESHOLD_OFFSET 0x380
> +#define OMAP4460_BGAP_TSHUT_OFFSET 0x384
> +#define OMAP4460_BGAP_STATUS_OFFSET 0x388
> +#define OMAP4460_FUSE_OPP_BGAP 0x260
> +
> +#define OMAP5430_TEMP_SENSOR_MPU_OFFSET 0x32C
> +#define OMAP5430_BGAP_CTRL_OFFSET 0x380
> +#define OMAP5430_BGAP_COUNTER_MPU_OFFSET 0x39C
> +#define OMAP5430_BGAP_THRESHOLD_MPU_OFFSET 0x384
> +#define OMAP5430_BGAP_TSHUT_MPU_OFFSET 0x390
> +#define OMAP5430_BGAP_STATUS_OFFSET 0x3A8
> +#define OMAP5430_FUSE_OPP_BGAP_MPU 0x1E4
> +
> +#define OMAP5430_TEMP_SENSOR_GPU_OFFSET 0x330
> +#define OMAP5430_BGAP_COUNTER_GPU_OFFSET 0x3A0
> +#define OMAP5430_BGAP_THRESHOLD_GPU_OFFSET 0x388
> +#define OMAP5430_BGAP_TSHUT_GPU_OFFSET 0x394
> +#define OMAP5430_FUSE_OPP_BGAP_GPU 0x1E0
> +
> +#define OMAP5430_TEMP_SENSOR_CORE_OFFSET 0x334
> +#define OMAP5430_BGAP_COUNTER_CORE_OFFSET 0x3A4
> +#define OMAP5430_BGAP_THRESHOLD_CORE_OFFSET 0x38C
> +#define OMAP5430_BGAP_TSHUT_CORE_OFFSET 0x398
> +#define OMAP5430_FUSE_OPP_BGAP_CORE 0x1E8
> +
> +#define OMAP4460_TSHUT_HOT 900 /* 122 deg C */
> +#define OMAP4460_TSHUT_COLD 895 /* 100 deg C */
> +#define OMAP4460_T_HOT 800 /* 73 deg C */
> +#define OMAP4460_T_COLD 795 /* 71 deg C */
> +#define OMAP4460_MAX_FREQ 1500000
> +#define OMAP4460_MIN_FREQ 1000000
> +#define OMAP4460_MIN_TEMP -40000
> +#define OMAP4460_MAX_TEMP 123000
> +#define OMAP4460_HYST_VAL 5000
> +#define OMAP4460_ADC_START_VALUE 530
> +#define OMAP4460_ADC_END_VALUE 932
> +
> +#define OMAP5430_MPU_TSHUT_HOT 915
> +#define OMAP5430_MPU_TSHUT_COLD 900
> +#define OMAP5430_MPU_T_HOT 800
> +#define OMAP5430_MPU_T_COLD 795
> +#define OMAP5430_MPU_MAX_FREQ 1500000
> +#define OMAP5430_MPU_MIN_FREQ 1000000
> +#define OMAP5430_MPU_MIN_TEMP -40000
> +#define OMAP5430_MPU_MAX_TEMP 125000
> +#define OMAP5430_MPU_HYST_VAL 5000
> +#define OMAP5430_ADC_START_VALUE 532
> +#define OMAP5430_ADC_END_VALUE 934
> +
> +#define OMAP5430_GPU_TSHUT_HOT 915
> +#define OMAP5430_GPU_TSHUT_COLD 900
> +#define OMAP5430_GPU_T_HOT 800
> +#define OMAP5430_GPU_T_COLD 795
> +#define OMAP5430_GPU_MAX_FREQ 1500000
> +#define OMAP5430_GPU_MIN_FREQ 1000000
> +#define OMAP5430_GPU_MIN_TEMP -40000
> +#define OMAP5430_GPU_MAX_TEMP 125000
> +#define OMAP5430_GPU_HYST_VAL 5000
> +
> +#define OMAP5430_CORE_TSHUT_HOT 915
> +#define OMAP5430_CORE_TSHUT_COLD 900
> +#define OMAP5430_CORE_T_HOT 800
> +#define OMAP5430_CORE_T_COLD 795
> +#define OMAP5430_CORE_MAX_FREQ 1500000
> +#define OMAP5430_CORE_MIN_FREQ 1000000
> +#define OMAP5430_CORE_MIN_TEMP -40000
> +#define OMAP5430_CORE_MAX_TEMP 125000
> +#define OMAP5430_CORE_HYST_VAL 5000
> +
> +/**
> + * The register offsets and bit fields might change across
> + * OMAP versions hence populating them in this structure.
> + */
> +
> +struct temp_sensor_registers {
> + u32 temp_sensor_ctrl;
> + u32 bgap_tempsoff_mask;
> + u32 bgap_soc_mask;
> + u32 bgap_eocz_mask;
> + u32 bgap_dtemp_mask;
> +
> + u32 bgap_mask_ctrl;
> + u32 mask_hot_mask;
> + u32 mask_cold_mask;
> +
> + u32 bgap_mode_ctrl;
> + u32 mode_ctrl_mask;
> +
> + u32 bgap_counter;
> + u32 counter_mask;
> +
> + u32 bgap_threshold;
> + u32 threshold_thot_mask;
> + u32 threshold_tcold_mask;
> +
> + u32 tshut_threshold;
> + u32 tshut_hot_mask;
> + u32 tshut_cold_mask;
> +
> + u32 bgap_status;
> + u32 status_clean_stop_mask;
> + u32 status_bgap_alert_mask;
> + u32 status_hot_mask;
> + u32 status_cold_mask;
> +
> + u32 bgap_efuse;
> +};
> +
> +/**
> + * The thresholds and limits for temperature sensors.
> + */
> +struct temp_sensor_data {
> + u32 tshut_hot;
> + u32 tshut_cold;
> + u32 t_hot;
> + u32 t_cold;
> + u32 min_freq;
> + u32 max_freq;
> + int max_temp;
> + int min_temp;
> + int hyst_val;
> + u32 adc_start_val;
> + u32 adc_end_val;
> + u32 update_int1;
> + u32 update_int2;
> +};
> +
> +/**
> + * struct temp_sensor_regval - temperature sensor register values
> + * @bg_mode_ctrl: temp sensor control register value
> + * @bg_ctrl: bandgap ctrl register value
> + * @bg_counter: bandgap counter value
> + * @bg_threshold: bandgap threshold register value
> + * @tshut_threshold: bandgap tshut register value
> + */
> +struct temp_sensor_regval {
> + u32 bg_mode_ctrl;
> + u32 bg_ctrl;
> + u32 bg_counter;
> + u32 bg_threshold;
> + u32 tshut_threshold;
> +};
> +
> +/**
> + * struct omap_temp_sensor - bandgap temperature sensor platform data
> + * @ts_data: pointer to struct with thresholds, limits of temperature sensor
> + * @registers: pointer to the list of register offsets and bitfields
> + * @regval: temperature sensor register values
> + * @domain: the name of the domain where the sensor is located
> + */
> +struct omap_temp_sensor {
> + struct temp_sensor_data *ts_data;
> + struct temp_sensor_registers *registers;
> + struct temp_sensor_regval *regval;
> + char *domain;
> +};
> +
> +/**
> + * struct omap_bandgap_data - bandgap platform data structure
> + * @has_talert: indicates if the chip has talert output line
> + * @has_tshut: indicates if the chip has tshut output line
> + * @conv_table: Pointer to adc to temperature conversion table
> + * @fclock_name: clock name of the functional clock
> + * @div_ck_nme: clock name of the clock divisor
> + * @sensor_count: count of temperature sensor device in scm
> + * @sensors: array of sensors present in this bandgap instance
> + * @expose_sensor: callback to export sensor to thermal API
> + */
> +struct omap_bandgap_data {
> + bool has_talert;
> + bool has_tshut;
> + const int *conv_table;
> + char *fclock_name;
> + char *div_ck_name;
> + int sensor_count;
> + int (*report_temperature)(struct omap_bandgap *bg_ptr, int id);
> + int (*expose_sensor)(struct omap_bandgap *bg_ptr, int id, char *domain);
> +
> + /* this needs to be at the end */
> + struct omap_temp_sensor sensors[];
> +};
> +
> +/* TODO: provide data structures for 4430 */
> +
> +/*
> + * OMAP4460 has one instance of thermal sensor for MPU
> + * need to describe the individual bit fields
> + */
> +static struct temp_sensor_registers
> +omap4460_mpu_temp_sensor_registers = {
> + .temp_sensor_ctrl = OMAP4460_TEMP_SENSOR_CTRL_OFFSET,
> + .bgap_tempsoff_mask = OMAP4460_BGAP_TEMPSOFF_MASK,
> + .bgap_soc_mask = OMAP4460_BGAP_TEMP_SENSOR_SOC_MASK,
> + .bgap_eocz_mask = OMAP4460_BGAP_TEMP_SENSOR_EOCZ_MASK,
> + .bgap_dtemp_mask = OMAP4460_BGAP_TEMP_SENSOR_DTEMP_MASK,
> +
> + .bgap_mask_ctrl = OMAP4460_BGAP_CTRL_OFFSET,
> + .mask_hot_mask = OMAP4460_MASK_HOT_MASK,
> + .mask_cold_mask = OMAP4460_MASK_COLD_MASK,
> +
> + .bgap_mode_ctrl = OMAP4460_BGAP_CTRL_OFFSET,
> + .mode_ctrl_mask = OMAP4460_SINGLE_MODE_MASK,
> +
> + .bgap_counter = OMAP4460_BGAP_COUNTER_OFFSET,
> + .counter_mask = OMAP4460_COUNTER_MASK,
> +
> + .bgap_threshold = OMAP4460_BGAP_THRESHOLD_OFFSET,
> + .threshold_thot_mask = OMAP4460_T_HOT_MASK,
> + .threshold_tcold_mask = OMAP4460_T_COLD_MASK,
> +
> + .tshut_threshold = OMAP4460_BGAP_TSHUT_OFFSET,
> + .tshut_hot_mask = OMAP4460_TSHUT_HOT_MASK,
> + .tshut_cold_mask = OMAP4460_TSHUT_COLD_MASK,
> +
> + .bgap_status = OMAP4460_BGAP_STATUS_OFFSET,
> + .status_clean_stop_mask = OMAP4460_CLEAN_STOP_MASK,
> + .status_bgap_alert_mask = OMAP4460_BGAP_ALERT_MASK,
> + .status_hot_mask = OMAP4460_HOT_FLAG_MASK,
> + .status_cold_mask = OMAP4460_COLD_FLAG_MASK,
> +
> + .bgap_efuse = OMAP4460_FUSE_OPP_BGAP,
> +};
> +
> +/*
> + * OMAP4460 has one instance of thermal sensor for MPU
Bad copy paste.
> + * need to describe the individual bit fields
> + */
> +static struct temp_sensor_registers
> +omap5430_mpu_temp_sensor_registers = {
> + .temp_sensor_ctrl = OMAP5430_TEMP_SENSOR_MPU_OFFSET,
> + .bgap_tempsoff_mask = OMAP5430_BGAP_TEMPSOFF_MASK,
> + .bgap_soc_mask = OMAP5430_BGAP_TEMP_SENSOR_SOC_MASK,
> + .bgap_eocz_mask = OMAP5430_BGAP_TEMP_SENSOR_EOCZ_MASK,
> + .bgap_dtemp_mask = OMAP5430_BGAP_TEMP_SENSOR_DTEMP_MASK,
> +
> + .bgap_mask_ctrl = OMAP5430_BGAP_CTRL_OFFSET,
> + .mask_hot_mask = OMAP5430_MASK_HOT_MPU_MASK,
> + .mask_cold_mask = OMAP5430_MASK_COLD_MPU_MASK,
> +
> + .bgap_mode_ctrl = OMAP5430_BGAP_COUNTER_MPU_OFFSET,
> + .mode_ctrl_mask = OMAP5430_REPEAT_MODE_MASK,
> +
> + .bgap_counter = OMAP5430_BGAP_COUNTER_MPU_OFFSET,
> + .counter_mask = OMAP5430_COUNTER_MASK,
> +
> + .bgap_threshold = OMAP5430_BGAP_THRESHOLD_MPU_OFFSET,
> + .threshold_thot_mask = OMAP5430_T_HOT_MASK,
> + .threshold_tcold_mask = OMAP5430_T_COLD_MASK,
> +
> + .tshut_threshold = OMAP5430_BGAP_TSHUT_MPU_OFFSET,
> + .tshut_hot_mask = OMAP5430_TSHUT_HOT_MASK,
> + .tshut_cold_mask = OMAP5430_TSHUT_COLD_MASK,
> +
> + .bgap_status = OMAP5430_BGAP_STATUS_OFFSET,
> + .status_clean_stop_mask = 0x0,
> + .status_bgap_alert_mask = OMAP5430_BGAP_ALERT_MASK,
> + .status_hot_mask = OMAP5430_HOT_MPU_FLAG_MASK,
> + .status_cold_mask = OMAP5430_COLD_MPU_FLAG_MASK,
> +
> + .bgap_efuse = OMAP5430_FUSE_OPP_BGAP_MPU,
> +};
> +
> +/*
> + * OMAP4460 has one instance of thermal sensor for MPU
> + * need to describe the individual bit fields
> + */
Ditto
> +static struct temp_sensor_registers
> +omap5430_gpu_temp_sensor_registers = {
> + .temp_sensor_ctrl = OMAP5430_TEMP_SENSOR_GPU_OFFSET,
> + .bgap_tempsoff_mask = OMAP5430_BGAP_TEMPSOFF_MASK,
> + .bgap_soc_mask = OMAP5430_BGAP_TEMP_SENSOR_SOC_MASK,
> + .bgap_eocz_mask = OMAP5430_BGAP_TEMP_SENSOR_EOCZ_MASK,
> + .bgap_dtemp_mask = OMAP5430_BGAP_TEMP_SENSOR_DTEMP_MASK,
> +
> + .bgap_mask_ctrl = OMAP5430_BGAP_CTRL_OFFSET,
> + .mask_hot_mask = OMAP5430_MASK_HOT_MM_MASK,
> + .mask_cold_mask = OMAP5430_MASK_COLD_MM_MASK,
> +
> + .bgap_mode_ctrl = OMAP5430_BGAP_COUNTER_GPU_OFFSET,
> + .mode_ctrl_mask = OMAP5430_REPEAT_MODE_MASK,
> +
> + .bgap_counter = OMAP5430_BGAP_COUNTER_GPU_OFFSET,
> + .counter_mask = OMAP5430_COUNTER_MASK,
> +
> + .bgap_threshold = OMAP5430_BGAP_THRESHOLD_GPU_OFFSET,
> + .threshold_thot_mask = OMAP5430_T_HOT_MASK,
> + .threshold_tcold_mask = OMAP5430_T_COLD_MASK,
> +
> + .tshut_threshold = OMAP5430_BGAP_TSHUT_GPU_OFFSET,
> + .tshut_hot_mask = OMAP5430_TSHUT_HOT_MASK,
> + .tshut_cold_mask = OMAP5430_TSHUT_COLD_MASK,
> +
> + .bgap_status = OMAP5430_BGAP_STATUS_OFFSET,
> + .status_clean_stop_mask = 0x0,
> + .status_bgap_alert_mask = OMAP5430_BGAP_ALERT_MASK,
> + .status_hot_mask = OMAP5430_HOT_MM_FLAG_MASK,
> + .status_cold_mask = OMAP5430_COLD_MM_FLAG_MASK,
> +
> + .bgap_efuse = OMAP5430_FUSE_OPP_BGAP_GPU,
> +};
> +
> +/*
> + * OMAP4460 has one instance of thermal sensor for MPU
> + * need to describe the individual bit fields
> + */
Ditto
> +static struct temp_sensor_registers
> +omap5430_core_temp_sensor_registers = {
> + .temp_sensor_ctrl = OMAP5430_TEMP_SENSOR_CORE_OFFSET,
> + .bgap_tempsoff_mask = OMAP5430_BGAP_TEMPSOFF_MASK,
> + .bgap_soc_mask = OMAP5430_BGAP_TEMP_SENSOR_SOC_MASK,
> + .bgap_eocz_mask = OMAP5430_BGAP_TEMP_SENSOR_EOCZ_MASK,
> + .bgap_dtemp_mask = OMAP5430_BGAP_TEMP_SENSOR_DTEMP_MASK,
> +
> + .bgap_mask_ctrl = OMAP5430_BGAP_CTRL_OFFSET,
> + .mask_hot_mask = OMAP5430_MASK_HOT_CORE_MASK,
> + .mask_cold_mask = OMAP5430_MASK_COLD_CORE_MASK,
> +
> + .bgap_mode_ctrl = OMAP5430_BGAP_COUNTER_CORE_OFFSET,
> + .mode_ctrl_mask = OMAP5430_REPEAT_MODE_MASK,
> +
> + .bgap_counter = OMAP5430_BGAP_COUNTER_CORE_OFFSET,
> + .counter_mask = OMAP5430_COUNTER_MASK,
> +
> + .bgap_threshold = OMAP5430_BGAP_THRESHOLD_CORE_OFFSET,
> + .threshold_thot_mask = OMAP5430_T_HOT_MASK,
> + .threshold_tcold_mask = OMAP5430_T_COLD_MASK,
> +
> + .tshut_threshold = OMAP5430_BGAP_TSHUT_CORE_OFFSET,
> + .tshut_hot_mask = OMAP5430_TSHUT_HOT_MASK,
> + .tshut_cold_mask = OMAP5430_TSHUT_COLD_MASK,
> +
> + .bgap_status = OMAP5430_BGAP_STATUS_OFFSET,
> + .status_clean_stop_mask = 0x0,
> + .status_bgap_alert_mask = OMAP5430_BGAP_ALERT_MASK,
> + .status_hot_mask = OMAP5430_HOT_CORE_FLAG_MASK,
> + .status_cold_mask = OMAP5430_COLD_CORE_FLAG_MASK,
> +
> + .bgap_efuse = OMAP5430_FUSE_OPP_BGAP_CORE,
> +};
> +
> +/* Thresholds and limits for OMAP4460 MPU temperature sensor */
> +static struct temp_sensor_data omap4460_mpu_temp_sensor_data = {
> + .tshut_hot = OMAP4460_TSHUT_HOT,
> + .tshut_cold = OMAP4460_TSHUT_COLD,
> + .t_hot = OMAP4460_T_HOT,
> + .t_cold = OMAP4460_T_COLD,
> + .min_freq = OMAP4460_MIN_FREQ,
> + .max_freq = OMAP4460_MAX_FREQ,
> + .max_temp = OMAP4460_MAX_TEMP,
> + .min_temp = OMAP4460_MIN_TEMP,
> + .hyst_val = OMAP4460_HYST_VAL,
> + .adc_start_val = OMAP4460_ADC_START_VALUE,
> + .adc_end_val = OMAP4460_ADC_END_VALUE,
> + .update_int1 = 1000,
> + .update_int2 = 2000,
> +};
> +
> +/* Thresholds and limits for OMAP5430 MPU temperature sensor */
> +static struct temp_sensor_data omap5430_mpu_temp_sensor_data = {
> + .tshut_hot = OMAP5430_MPU_TSHUT_HOT,
> + .tshut_cold = OMAP5430_MPU_TSHUT_COLD,
> + .t_hot = OMAP5430_MPU_T_HOT,
> + .t_cold = OMAP5430_MPU_T_COLD,
> + .min_freq = OMAP5430_MPU_MIN_FREQ,
> + .max_freq = OMAP5430_MPU_MAX_FREQ,
> + .max_temp = OMAP5430_MPU_MAX_TEMP,
> + .min_temp = OMAP5430_MPU_MIN_TEMP,
> + .hyst_val = OMAP5430_MPU_HYST_VAL,
> + .adc_start_val = OMAP5430_ADC_START_VALUE,
> + .adc_end_val = OMAP5430_ADC_END_VALUE,
> + .update_int1 = 1000,
> + .update_int2 = 2000,
> +};
> +
> +/* Thresholds and limits for OMAP5430 GPU temperature sensor */
> +static struct temp_sensor_data omap5430_gpu_temp_sensor_data = {
> + .tshut_hot = OMAP5430_GPU_TSHUT_HOT,
> + .tshut_cold = OMAP5430_GPU_TSHUT_COLD,
> + .t_hot = OMAP5430_GPU_T_HOT,
> + .t_cold = OMAP5430_GPU_T_COLD,
> + .min_freq = OMAP5430_GPU_MIN_FREQ,
> + .max_freq = OMAP5430_GPU_MAX_FREQ,
> + .max_temp = OMAP5430_GPU_MAX_TEMP,
> + .min_temp = OMAP5430_GPU_MIN_TEMP,
> + .hyst_val = OMAP5430_GPU_HYST_VAL,
> + .adc_start_val = OMAP5430_ADC_START_VALUE,
> + .adc_end_val = OMAP5430_ADC_END_VALUE,
> + .update_int1 = 1000,
> + .update_int2 = 2000,
> +};
> +
> +/* Thresholds and limits for OMAP5430 CORE temperature sensor */
> +static struct temp_sensor_data omap5430_core_temp_sensor_data = {
> + .tshut_hot = OMAP5430_CORE_TSHUT_HOT,
> + .tshut_cold = OMAP5430_CORE_TSHUT_COLD,
> + .t_hot = OMAP5430_CORE_T_HOT,
> + .t_cold = OMAP5430_CORE_T_COLD,
> + .min_freq = OMAP5430_CORE_MIN_FREQ,
> + .max_freq = OMAP5430_CORE_MAX_FREQ,
> + .max_temp = OMAP5430_CORE_MAX_TEMP,
> + .min_temp = OMAP5430_CORE_MIN_TEMP,
> + .hyst_val = OMAP5430_CORE_HYST_VAL,
> + .adc_start_val = OMAP5430_ADC_START_VALUE,
> + .adc_end_val = OMAP5430_ADC_END_VALUE,
> + .update_int1 = 1000,
> + .update_int2 = 2000,
> +};
> +
> +/*
> + * Temperature values in milli degree celsius
> + * ADC code values from 530 to 923
> + */
> +static const int
> +omap4460_adc_to_temp[OMAP4460_ADC_END_VALUE - OMAP4460_ADC_START_VALUE + 1] = {
> + -40000, -40000, -40000, -40000, -39800, -39400, -39000, -38600, -38200,
> + -37800, -37300, -36800, -36400, -36000, -35600, -35200, -34800,
> + -34300, -33800, -33400, -33000, -32600, -32200, -31800, -31300,
> + -30800, -30400, -30000, -29600, -29200, -28700, -28200, -27800,
> + -27400, -27000, -26600, -26200, -25700, -25200, -24800, -24400,
> + -24000, -23600, -23200, -22700, -22200, -21800, -21400, -21000,
> + -20600, -20200, -19700, -19200, -18800, -18400, -18000, -17600,
> + -17200, -16700, -16200, -15800, -15400, -15000, -14600, -14200,
> + -13700, -13200, -12800, -12400, -12000, -11600, -11200, -10700,
> + -10200, -9800, -9400, -9000, -8600, -8200, -7700, -7200, -6800,
> + -6400, -6000, -5600, -5200, -4800, -4300, -3800, -3400, -3000,
> + -2600, -2200, -1800, -1300, -800, -400, 0, 400, 800, 1200, 1600,
> + 2100, 2600, 3000, 3400, 3800, 4200, 4600, 5100, 5600, 6000, 6400,
> + 6800, 7200, 7600, 8000, 8500, 9000, 9400, 9800, 10200, 10600, 11000,
> + 11400, 11900, 12400, 12800, 13200, 13600, 14000, 14400, 14800,
> + 15300, 15800, 16200, 16600, 17000, 17400, 17800, 18200, 18700,
> + 19200, 19600, 20000, 20400, 20800, 21200, 21600, 22100, 22600,
> + 23000, 23400, 23800, 24200, 24600, 25000, 25400, 25900, 26400,
> + 26800, 27200, 27600, 28000, 28400, 28800, 29300, 29800, 30200,
> + 30600, 31000, 31400, 31800, 32200, 32600, 33100, 33600, 34000,
> + 34400, 34800, 35200, 35600, 36000, 36400, 36800, 37300, 37800,
> + 38200, 38600, 39000, 39400, 39800, 40200, 40600, 41100, 41600,
> + 42000, 42400, 42800, 43200, 43600, 44000, 44400, 44800, 45300,
> + 45800, 46200, 46600, 47000, 47400, 47800, 48200, 48600, 49000,
> + 49500, 50000, 50400, 50800, 51200, 51600, 52000, 52400, 52800,
> + 53200, 53700, 54200, 54600, 55000, 55400, 55800, 56200, 56600,
> + 57000, 57400, 57800, 58200, 58700, 59200, 59600, 60000, 60400,
> + 60800, 61200, 61600, 62000, 62400, 62800, 63300, 63800, 64200,
> + 64600, 65000, 65400, 65800, 66200, 66600, 67000, 67400, 67800,
> + 68200, 68700, 69200, 69600, 70000, 70400, 70800, 71200, 71600,
> + 72000, 72400, 72800, 73200, 73600, 74100, 74600, 75000, 75400,
> + 75800, 76200, 76600, 77000, 77400, 77800, 78200, 78600, 79000,
> + 79400, 79800, 80300, 80800, 81200, 81600, 82000, 82400, 82800,
> + 83200, 83600, 84000, 84400, 84800, 85200, 85600, 86000, 86400,
> + 86800, 87300, 87800, 88200, 88600, 89000, 89400, 89800, 90200,
> + 90600, 91000, 91400, 91800, 92200, 92600, 93000, 93400, 93800,
> + 94200, 94600, 95000, 95500, 96000, 96400, 96800, 97200, 97600,
> + 98000, 98400, 98800, 99200, 99600, 100000, 100400, 100800, 101200,
> + 101600, 102000, 102400, 102800, 103200, 103600, 104000, 104400,
> + 104800, 105200, 105600, 106100, 106600, 107000, 107400, 107800,
> + 108200, 108600, 109000, 109400, 109800, 110200, 110600, 111000,
> + 111400, 111800, 112200, 112600, 113000, 113400, 113800, 114200,
> + 114600, 115000, 115400, 115800, 116200, 116600, 117000, 117400,
> + 117800, 118200, 118600, 119000, 119400, 119800, 120200, 120600,
> + 121000, 121400, 121800, 122200, 122600, 123000, 123400, 123800, 124200,
> + 124600, 124900, 125000, 125000, 125000, 125000
> +};
> +
> +static const int
> +omap5430_adc_to_temp[OMAP5430_ADC_END_VALUE - OMAP5430_ADC_START_VALUE + 1] = {
> + -40000, -40000, -40000, -40000, -39800, -39400, -39000, -38600,
> + -38200, -37800, -37300, -36800,
> + -36400, -36000, -35600, -35200, -34800, -34300, -33800, -33400, -33000,
> + -32600,
> + -32200, -31800, -31300, -30800, -30400, -30000, -29600, -29200, -28700,
> + -28200, -27800, -27400, -27000, -26600, -26200, -25700, -25200, -24800,
> + -24400, -24000, -23600, -23200, -22700, -22200, -21800, -21400, -21000,
> + -20600, -20200, -19700, -19200, -9300, -18400, -18000, -17600, -17200,
> + -16700, -16200, -15800, -15400, -15000, -14600, -14200, -13700, -13200,
> + -12800, -12400, -12000, -11600, -11200, -10700, -10200, -9800, -9400,
> + -9000,
> + -8600, -8200, -7700, -7200, -6800, -6400, -6000, -5600, -5200, -4800,
> + -4300,
> + -3800, -3400, -3000, -2600, -2200, -1800, -1300, -800, -400, 0, 400,
> + 800,
> + 1200, 1600, 2100, 2600, 3000, 3400, 3800, 4200, 4600, 5100, 5600, 6000,
> + 6400, 6800, 7200, 7600, 8000, 8500, 9000, 9400, 9800, 10200, 10800,
> + 11100,
> + 11400, 11900, 12400, 12800, 13200, 13600, 14000, 14400, 14800, 15300,
> + 15800,
> + 16200, 16600, 17000, 17400, 17800, 18200, 18700, 19200, 19600, 20000,
> + 20400,
> + 20800, 21200, 21600, 22100, 22600, 23000, 23400, 23800, 24200, 24600,
> + 25000,
> + 25400, 25900, 26400, 26800, 27200, 27600, 28000, 28400, 28800, 29300,
> + 29800,
> + 30200, 30600, 31000, 31400, 31800, 32200, 32600, 33100, 33600, 34000,
> + 34400,
> + 34800, 35200, 35600, 36000, 36400, 36800, 37300, 37800, 38200, 38600,
> + 39000,
> + 39400, 39800, 40200, 40600, 41100, 41600, 42000, 42400, 42800, 43200,
> + 43600,
> + 44000, 44400, 44800, 45300, 45800, 46200, 46600, 47000, 47400, 47800,
> + 48200,
> + 48600, 49000, 49500, 50000, 50400, 50800, 51200, 51600, 52000, 52400,
> + 52800,
> + 53200, 53700, 54200, 54600, 55000, 55400, 55800, 56200, 56600, 57000,
> + 57400,
> + 57800, 58200, 58700, 59200, 59600, 60000, 60400, 60800, 61200, 61600,
> + 62000,
> + 62400, 62800, 63300, 63800, 64200, 64600, 65000, 65400, 65800, 66200,
> + 66600,
> + 67000, 67400, 67800, 68200, 68700, 69200, 69600, 70000, 70400, 70800,
> + 71200,
> + 71600, 72000, 72400, 72800, 73200, 73600, 74100, 74600, 75000, 75400,
> + 75800,
> + 76200, 76600, 77000, 77400, 77800, 78200, 78600, 79000, 79400, 79800,
> + 80300,
> + 80800, 81200, 81600, 82000, 82400, 82800, 83200, 83600, 84000, 84400,
> + 84800,
> + 85200, 85600, 86000, 86400, 86800, 87300, 87800, 88200, 88600, 89000,
> + 89400,
> + 89800, 90200, 90600, 91000, 91400, 91800, 92200, 92600, 93000, 93400,
> + 93800,
> + 94200, 94600, 95000, 95500, 96000, 96400, 96800, 97200, 97600, 98000,
> + 98400,
> + 98800, 99200, 99600, 100000, 100400, 100800, 101200, 101600, 102000,
> + 102400,
> + 102800, 103200, 103600, 104000, 104400, 104800, 105200, 105600, 106100,
> + 106600, 107000, 107400, 107800, 108200, 108600, 109000, 109400, 109800,
> + 110200, 110600, 111000, 111400, 111800, 112200, 112600, 113000, 113400,
> + 113800, 114200, 114600, 115000, 115400, 115800, 116200, 116600, 117000,
> + 117400, 117800, 118200, 118600, 119000, 119400, 119800, 120200, 120600,
> + 121000, 121400, 121800, 122200, 122600, 123000, 123400, 123800, 124200,
> + 124600, 124900, 125000, 125000, 125000, 125000,
> +};
It might be good to store the per SoC data in dedicated files or at
least put some #ifdef around to avoid wasting memory for a non-multi
OMAP boot.
> +
> +static irqreturn_t talert_irq_handler(int irq, void *data)
> +{
> + struct omap_bandgap *bg_ptr = data;
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + u32 t_hot = 0, t_cold = 0, temp, ctrl;
> + int i, r;
> +
> + bg_ptr = data;
> + /* Read the status of t_hot */
> + for (i = 0; i< bg_ptr->pdata->sensor_count; i++) {
> + tsr = bg_ptr->pdata->sensors[i].registers;
> + r = omap_control_readl(cdev, tsr->bgap_status,&t_hot);
> + t_hot&= tsr->status_hot_mask;
> +
> + /* Read the status of t_cold */
> + r |= omap_control_readl(cdev, tsr->bgap_status,&t_cold);
> + t_cold&= tsr->status_cold_mask;
> +
> + if (!t_cold&& !t_hot)
> + continue;
> +
> + r |= omap_control_readl(cdev, tsr->bgap_mask_ctrl,&ctrl);
> + /*
> + * One TALERT interrupt: Two sources
> + * If the interrupt is due to t_hot then mask t_hot and
> + * and unmask t_cold else mask t_cold and unmask t_hot
> + */
> + if (t_hot) {
> + ctrl&= ~tsr->mask_hot_mask;
> + ctrl |= tsr->mask_cold_mask;
> + } else if (t_cold) {
> + ctrl&= ~tsr->mask_cold_mask;
> + ctrl |= tsr->mask_hot_mask;
> + }
> +
> + r |= omap_control_writel(cdev, ctrl, tsr->bgap_mask_ctrl);
> +
> + if (r) {
> + dev_err(bg_ptr->dev, "failed to ack talert interrupt\n");
> + return IRQ_NONE;
> + }
> +
> + /* read temperature */
> + r = omap_control_readl(cdev, tsr->temp_sensor_ctrl,&temp);
> + temp&= tsr->bgap_dtemp_mask;
> +
> + /* report temperature to whom may concern */
> + if (bg_ptr->pdata->report_temperature)
> + bg_ptr->pdata->report_temperature(bg_ptr, i);
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t omap_bandgap_tshut_irq_handler(int irq, void *data)
> +{
> + orderly_poweroff(true);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static
> +int adc_to_temp_conversion(struct omap_bandgap *bg_ptr, int id, int adc_val,
> + int *t)
> +{
> + struct temp_sensor_data *ts_data = bg_ptr->pdata->sensors[id].ts_data;
> +
> + /* look up for temperature in the table and return the temperature */
> + if (adc_val< ts_data->adc_start_val || adc_val> ts_data->adc_end_val)
> + return -ERANGE;
> +
> + *t = bg_ptr->conv_table[adc_val - ts_data->adc_start_val];
> +
> + return 0;
> +}
> +
> +static int temp_to_adc_conversion(long temp, struct omap_bandgap *bg_ptr, int i,
> + int *adc)
> +{
> + struct temp_sensor_data *ts_data = bg_ptr->pdata->sensors[i].ts_data;
> + int high, low, mid;
> +
> + low = 0;
> + high = ts_data->adc_end_val - ts_data->adc_start_val;
> + mid = (high + low) / 2;
> +
> + if (temp< bg_ptr->conv_table[high] || temp> bg_ptr->conv_table[high])
> + return -EINVAL;
> +
> + while (low< high) {
> + if (temp< bg_ptr->conv_table[mid])
> + high = mid - 1;
> + else
> + low = mid + 1;
> + mid = (low + high) / 2;
> + }
> +
> + *adc = ts_data->adc_start_val + low;
> +
> + return 0;
> +}
> +
> +static int temp_sensor_unmask_interrupts(struct omap_bandgap *bg_ptr, int id,
> + u32 t_hot, u32 t_cold)
> +{
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + u32 temp, reg_val;
> + int err;
> +
> + /* Read the current on die temperature */
> + tsr = bg_ptr->pdata->sensors[id].registers;
> + err = omap_control_readl(cdev, tsr->temp_sensor_ctrl,&temp);
> + temp&= tsr->bgap_dtemp_mask;
> +
> + err |= omap_control_readl(cdev, tsr->bgap_mask_ctrl,®_val);
> + if (temp< t_hot)
> + reg_val |= tsr->mask_hot_mask;
> + else
> + reg_val&= ~tsr->mask_hot_mask;
> +
> + if (t_cold< temp)
> + reg_val |= tsr->mask_cold_mask;
> + else
> + reg_val&= ~tsr->mask_cold_mask;
> + err |= omap_control_writel(cdev, reg_val, tsr->bgap_mask_ctrl);
> +
> + if (err) {
> + dev_err(bg_ptr->dev, "failed to unmask interrupts\n");
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +static
> +int add_hyst(int adc_val, int hyst_val, struct omap_bandgap *bg_ptr, int i,
> + u32 *sum)
> +{
> + int temp, ret;
> +
> + ret = adc_to_temp_conversion(bg_ptr, i, adc_val,&temp);
> + if (ret< 0)
> + return ret;
> +
> + temp += hyst_val;
> +
> + return temp_to_adc_conversion(temp, bg_ptr, i, sum);
> +}
> +
> +static
> +int temp_sensor_configure_thot(struct omap_bandgap *bg_ptr, int id, int t_hot)
> +{
> + struct temp_sensor_data *ts_data = bg_ptr->pdata->sensors[id].ts_data;
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + u32 thresh_val, reg_val;
> + int cold, err;
> +
> + tsr = bg_ptr->pdata->sensors[id].registers;
> +
> + /* obtain the T cold value */
> + err = omap_control_readl(cdev, tsr->bgap_threshold,&thresh_val);
> + cold = (thresh_val& tsr->threshold_tcold_mask)>>
> + __ffs(tsr->threshold_tcold_mask);
> + if (t_hot<= cold) {
> + /* change the t_cold to t_hot - 5000 millidegrees */
> + err |= add_hyst(t_hot, -ts_data->hyst_val, bg_ptr, id,&cold);
> + /* write the new t_cold value */
> + reg_val = thresh_val& (~tsr->threshold_tcold_mask);
> + reg_val |= cold<< __ffs(tsr->threshold_tcold_mask);
> + err |= omap_control_writel(cdev, reg_val, tsr->bgap_threshold);
> + thresh_val = reg_val;
> + }
> +
> + /* write the new t_hot value */
> + reg_val = thresh_val& ~tsr->threshold_thot_mask;
> + reg_val |= (t_hot<< __ffs(tsr->threshold_thot_mask));
> + err |= omap_control_writel(cdev, reg_val, tsr->bgap_threshold);
> + if (err) {
> + dev_err(bg_ptr->dev, "failed to reprogram thot threshold\n");
> + return -EIO;
> + }
> +
> + return temp_sensor_unmask_interrupts(bg_ptr, id, t_hot, cold);
> +}
> +
> +static
> +int temp_sensor_init_talert_thresholds(struct omap_bandgap *bg_ptr, int id,
> + int t_hot, int t_cold)
> +{
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + u32 reg_val, thresh_val;
> + int err;
> +
> + tsr = bg_ptr->pdata->sensors[id].registers;
> + err = omap_control_readl(cdev, tsr->bgap_threshold,&thresh_val);
> +
> + /* write the new t_cold value */
> + reg_val = thresh_val& ~tsr->threshold_tcold_mask;
> + reg_val |= (t_cold<< __ffs(tsr->threshold_tcold_mask));
> + err |= omap_control_writel(cdev, reg_val, tsr->bgap_threshold);
> + if (err) {
> + dev_err(bg_ptr->dev, "failed to reprogram tcold threshold\n");
> + return -EIO;
> + }
> +
> + err = omap_control_readl(cdev, tsr->bgap_threshold,&thresh_val);
> +
> + /* write the new t_hot value */
> + reg_val = thresh_val& ~tsr->threshold_thot_mask;
> + reg_val |= (t_hot<< __ffs(tsr->threshold_thot_mask));
> + err |= omap_control_writel(cdev, reg_val, tsr->bgap_threshold);
> + if (err) {
> + dev_err(bg_ptr->dev, "failed to reprogram thot threshold\n");
> + return -EIO;
> + }
> +
> + err = omap_control_readl(cdev, tsr->bgap_mask_ctrl,®_val);
> + reg_val |= tsr->mask_hot_mask;
> + reg_val |= tsr->mask_cold_mask;
> + err |= omap_control_writel(cdev, reg_val, tsr->bgap_mask_ctrl);
> + if (err) {
> + dev_err(bg_ptr->dev, "failed to reprogram thot threshold\n");
> + return -EIO;
> + }
> +
> + return err;
> +}
> +
> +static
> +int temp_sensor_configure_tcold(struct omap_bandgap *bg_ptr, int id,
> + int t_cold)
> +{
> + struct temp_sensor_data *ts_data = bg_ptr->pdata->sensors[id].ts_data;
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + u32 thresh_val, reg_val;
> + int hot, err;
> +
> + tsr = bg_ptr->pdata->sensors[id].registers;
> + /* obtain the T cold value */
> + err = omap_control_readl(cdev, tsr->bgap_threshold,&thresh_val);
> + hot = (thresh_val& tsr->threshold_thot_mask)>>
> + __ffs(tsr->threshold_thot_mask);
> +
> + if (t_cold>= hot) {
> + /* change the t_hot to t_cold + 5000 millidegrees */
> + err |= add_hyst(t_cold, ts_data->hyst_val, bg_ptr, id,&hot);
> + /* write the new t_hot value */
> + reg_val = thresh_val& (~tsr->threshold_thot_mask);
> + reg_val |= hot<< __ffs(tsr->threshold_thot_mask);
> + err |= omap_control_writel(cdev, reg_val, tsr->bgap_threshold);
> + thresh_val = reg_val;
> + }
> +
> + /* write the new t_cold value */
> + reg_val = thresh_val& ~tsr->threshold_tcold_mask;
> + reg_val |= (t_cold<< __ffs(tsr->threshold_tcold_mask));
> + err |= omap_control_writel(cdev, reg_val, tsr->bgap_threshold);
> + if (err) {
> + dev_err(bg_ptr->dev, "failed to reprogram tcold threshold\n");
> + return -EIO;
> + }
> +
> + return temp_sensor_unmask_interrupts(bg_ptr, id, hot, t_cold);
> +}
> +
> +static int temp_sensor_configure_tshut_hot(struct omap_bandgap *bg_ptr,
> + int id, int tshut_hot)
> +{
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + u32 reg_val;
> + int err;
> +
> + tsr = bg_ptr->pdata->sensors[id].registers;
> + err = omap_control_readl(cdev, tsr->tshut_threshold,®_val);
> + reg_val&= ~tsr->tshut_hot_mask;
> + reg_val |= tshut_hot<< __ffs(tsr->tshut_hot_mask);
> + err |= omap_control_writel(cdev, reg_val, tsr->tshut_threshold);
> + if (err) {
> + dev_err(bg_ptr->dev, "failed to reprogram tshut thot\n");
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +static int temp_sensor_configure_tshut_cold(struct omap_bandgap *bg_ptr,
> + int id, int tshut_cold)
> +{
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + u32 reg_val;
> + int err;
> +
> + tsr = bg_ptr->pdata->sensors[id].registers;
> + err = omap_control_readl(cdev, tsr->tshut_threshold,®_val);
> + reg_val&= ~tsr->tshut_cold_mask;
> + reg_val |= tshut_cold<< __ffs(tsr->tshut_cold_mask);
> + err |= omap_control_writel(cdev, reg_val, tsr->tshut_threshold);
> + if (err) {
> + dev_err(bg_ptr->dev, "failed to reprogram tshut tcold\n");
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +static int configure_temp_sensor_counter(struct omap_bandgap *bg_ptr, int id,
> + u32 counter)
> +{
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + u32 val;
> + int err;
> +
> + tsr = bg_ptr->pdata->sensors[id].registers;
> + err = omap_control_readl(cdev, tsr->bgap_counter,&val);
> + val&= ~tsr->counter_mask;
> + val |= counter<< __ffs(tsr->counter_mask);
> + err |= omap_control_writel(cdev, val, tsr->bgap_counter);
> + if (err) {
> + dev_err(bg_ptr->dev, "failed to reprogram tshut tcold\n");
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +/* Exposed APIs */
> +/**
> + * omap_bandgap_read_thot() - reads sensor current thot
> + * @bg_ptr - pointer to bandgap instance
> + * @id - sensor id
> + * @thot - resulting current thot value
> + *
> + * returns 0 on success or the proper error code
> + */
> +int omap_bandgap_read_thot(struct omap_bandgap *bg_ptr, int id,
> + int *thot)
> +{
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + u32 temp;
> + int ret;
> +
> + tsr = bg_ptr->pdata->sensors[id].registers;
> + ret = omap_control_readl(cdev, tsr->bgap_threshold,&temp);
> + temp = (temp& tsr->threshold_thot_mask)>>
> + __ffs(tsr->threshold_thot_mask);
> + ret |= adc_to_temp_conversion(bg_ptr, id, temp,&temp);
> + if (ret) {
> + dev_err(bg_ptr->dev, "failed to read thot\n");
> + return -EIO;
> + }
> +
> + *thot = temp;
> +
> + return 0;
> +}
> +
> +/**
> + * omap_bandgap_write_thot() - sets sensor current thot
> + * @bg_ptr - pointer to bandgap instance
> + * @id - sensor id
> + * @val - desired thot value
> + *
> + * returns 0 on success or the proper error code
> + */
> +int omap_bandgap_write_thot(struct omap_bandgap *bg_ptr, int id, int val)
> +{
> + struct temp_sensor_data *ts_data = bg_ptr->pdata->sensors[id].ts_data;
> + struct temp_sensor_registers *tsr;
> + u32 t_hot;
> + int ret;
> +
> + tsr = bg_ptr->pdata->sensors[id].registers;
> +
> + if (val< ts_data->min_temp + ts_data->hyst_val)
> + return -EINVAL;
> + ret = temp_to_adc_conversion(val, bg_ptr, id,&t_hot);
> + if (ret< 0)
> + return ret;
> +
> + mutex_lock(&bg_ptr->bg_mutex);
> + temp_sensor_configure_thot(bg_ptr, id, t_hot);
> + mutex_unlock(&bg_ptr->bg_mutex);
> +
> + return 0;
> +}
> +
> +/**
> + * omap_bandgap_read_tcold() - reads sensor current tcold
> + * @bg_ptr - pointer to bandgap instance
> + * @id - sensor id
> + * @tcold - resulting current tcold value
> + *
> + * returns 0 on success or the proper error code
> + */
> +int omap_bandgap_read_tcold(struct omap_bandgap *bg_ptr, int id,
> + int *tcold)
> +{
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + u32 temp;
> + int ret;
> +
> + tsr = bg_ptr->pdata->sensors[id].registers;
> + ret = omap_control_readl(cdev, tsr->bgap_threshold,&temp);
> + temp = (temp& tsr->threshold_tcold_mask)
> + >> __ffs(tsr->threshold_tcold_mask);
> + ret |= adc_to_temp_conversion(bg_ptr, id, temp,&temp);
> + if (ret)
> + return -EIO;
> +
> + *tcold = temp;
> +
> + return 0;
> +}
> +
> +/**
> + * omap_bandgap_write_tcold() - sets the sensor tcold
> + * @bg_ptr - pointer to bandgap instance
> + * @id - sensor id
> + * @val - desired tcold value
> + *
> + * returns 0 on success or the proper error code
> + */
> +int omap_bandgap_write_tcold(struct omap_bandgap *bg_ptr, int id, int val)
> +{
> + struct temp_sensor_data *ts_data = bg_ptr->pdata->sensors[id].ts_data;
> + struct temp_sensor_registers *tsr;
> + u32 t_cold;
> + int ret;
> +
> + tsr = bg_ptr->pdata->sensors[id].registers;
> + if (val> ts_data->max_temp + ts_data->hyst_val)
> + return -EINVAL;
> +
> + ret = temp_to_adc_conversion(val, bg_ptr, id,&t_cold);
> + if (ret< 0)
> + return ret;
> +
> + mutex_lock(&bg_ptr->bg_mutex);
> + temp_sensor_configure_tcold(bg_ptr, id, t_cold);
> + mutex_unlock(&bg_ptr->bg_mutex);
> +
> + return 0;
> +}
> +
> +/**
> + * omap_bandgap_read_update_interval() - read the sensor update interval
> + * @bg_ptr - pointer to bandgap instance
> + * @id - sensor id
> + * @interval - resulting update interval in miliseconds
> + *
> + * returns 0 on success or the proper error code
> + */
> +int omap_bandgap_read_update_interval(struct omap_bandgap *bg_ptr, int id,
> + int *interval)
> +{
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + u32 time;
> + int ret;
> +
> + tsr = bg_ptr->pdata->sensors[id].registers;
> + ret = omap_control_readl(cdev, tsr->bgap_counter,&time);
> + if (ret)
> + return ret;
> + time = (time& tsr->counter_mask)>> __ffs(tsr->counter_mask);
> + time = time * 1000 / bg_ptr->clk_rate;
> +
> + *interval = time;
> +
> + return 0;
> +}
> +
> +/**
> + * omap_bandgap_write_update_interval() - set the update interval
> + * @bg_ptr - pointer to bandgap instance
> + * @id - sensor id
> + * @interval - desired update interval in miliseconds
> + *
> + * returns 0 on success or the proper error code
> + */
> +int omap_bandgap_write_update_interval(struct omap_bandgap *bg_ptr,
> + int id, u32 interval)
> +{
> + interval = interval * bg_ptr->clk_rate / 1000;
> + mutex_lock(&bg_ptr->bg_mutex);
> + configure_temp_sensor_counter(bg_ptr, id, interval);
> + mutex_unlock(&bg_ptr->bg_mutex);
> +
> + return 0;
> +}
> +
> +/**
> + * omap_bandgap_read_temperature() - report current temperature
> + * @bg_ptr - pointer to bandgap instance
> + * @id - sensor id
> + * @temperature - resulting temperature
> + *
> + * returns 0 on success or the proper error code
> + */
> +int omap_bandgap_read_temperature(struct omap_bandgap *bg_ptr, int id,
> + int *temperature)
> +{
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + u32 temp;
> + int ret;
> +
> + tsr = bg_ptr->pdata->sensors[id].registers;
> + ret = omap_control_readl(cdev, tsr->temp_sensor_ctrl,&temp);
> + temp&= tsr->bgap_dtemp_mask;
> +
> + ret |= adc_to_temp_conversion(bg_ptr, id, temp,&temp);
> + if (ret)
> + return -EIO;
> +
> + *temperature = temp;
> +
> + return 0;
> +}
> +
> +/**
> + * enable_continuous_mode() - One time enabling of continuous conversion mode
> + * @bg_ptr - pointer to scm instance
> + */
> +static int enable_continuous_mode(struct omap_bandgap *bg_ptr)
> +{
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + int i, r;
> + u32 val;
> +
> + for (i = 0; i< bg_ptr->pdata->sensor_count; i++) {
> + tsr = bg_ptr->pdata->sensors[i].registers;
> + r = omap_control_readl(cdev, tsr->bgap_mode_ctrl,&val);
> + val |= 1<< __ffs(tsr->mode_ctrl_mask);
> + r |= omap_control_writel(cdev, val, tsr->bgap_mode_ctrl);
> + if (r)
> + dev_err(bg_ptr->dev, "could not save sensor %d\n", i);
> + }
> +
> + return r ? -EIO : 0;
> +}
> +
> +static int omap_bandgap_tshut_init(struct omap_bandgap *bg_ptr,
> + struct platform_device *pdev)
> +{
> + int gpio_nr = bg_ptr->tshut_gpio;
> + int status;
> +
> + /* Request for gpio_86 line */
> + status = gpio_request(gpio_nr, "tshut");
> + if (status< 0) {
> + dev_err(bg_ptr->dev,
> + "Could not request for TSHUT GPIO:%i\n", 86);
> + return status;
> + }
> + status = gpio_direction_input(gpio_nr);
> + if (status) {
> + dev_err(bg_ptr->dev,
> + "Cannot set input TSHUT GPIO %d\n", gpio_nr);
> + return status;
> + }
> +
> + status = request_irq(gpio_to_irq(gpio_nr),
> + omap_bandgap_tshut_irq_handler,
> + IRQF_TRIGGER_RISING, "tshut",
> + NULL);
> + if (status) {
> + gpio_free(gpio_nr);
> + dev_err(bg_ptr->dev, "request irq failed for TSHUT");
> + }
> +
> + return 0;
> +}
> +
> +static int omap_bandgap_talert_init(struct omap_bandgap *bg_ptr,
> + struct platform_device *pdev)
> +{
> + int ret;
> +
> + bg_ptr->irq = platform_get_irq(pdev, 0);
> + if (bg_ptr->irq< 0) {
> + dev_err(&pdev->dev, "get_irq failed\n");
> + return bg_ptr->irq;
> + }
> + ret = request_threaded_irq(bg_ptr->irq, NULL,
> + talert_irq_handler,
> + IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
> + "talert", bg_ptr);
> + if (ret) {
> + dev_err(&pdev->dev, "Request threaded irq failed.\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static const struct omap_bandgap_data omap4460_data = {
> + .has_talert = true,
> + .has_tshut = true,
> + .fclock_name = "bandgap_ts_fclk",
> + .div_ck_name = "div_ts_ck",
None of these clock data should be there ideally. You should ensure that
the proper device alias will be there using clkdev entries.
Except that with DT, it will not work without the clock DT binding :-(
I think Rob posted a latest update based on CCF... but for the moment we
are stuck :-(
> + .conv_table = omap4460_adc_to_temp,
> + .sensors = {
> + {
> + .registers =&omap4460_mpu_temp_sensor_registers,
> + .ts_data =&omap4460_mpu_temp_sensor_data,
> + .domain = "cpu",
> + },
> + },
> + .sensor_count = 1,
> +};
> +
> +static const struct omap_bandgap_data omap5430_data = {
> + .has_talert = true,
> + .has_tshut = true,
> + .fclock_name = "ts_clk_div_ck",
> + .div_ck_name = "ts_clk_div_ck",
> + .conv_table = omap5430_adc_to_temp,
> + .sensors = {
> + {
> + .registers =&omap5430_mpu_temp_sensor_registers,
> + .ts_data =&omap5430_mpu_temp_sensor_data,
> + .domain = "cpu",
> + },
> + {
> + .registers =&omap5430_gpu_temp_sensor_registers,
> + .ts_data =&omap5430_gpu_temp_sensor_data,
> + .domain = "gpu",
> + },
> + {
> + .registers =&omap5430_core_temp_sensor_registers,
> + .ts_data =&omap5430_core_temp_sensor_data,
> + .domain = "core",
> + },
> + },
> + .sensor_count = 3,
It can probably be replaced by a sizeof.
> +};
> +
> +static const struct of_device_id of_omap_bandgap_match[] = {
> + /*
> + * TODO: Add support to 4430
> + * { .compatible = "ti,omap4430-bandgap", .data = , },
> + */
> + {
> + .compatible = "ti,omap4460-bandgap",
> + .data = (void *)&omap4460_data,
No need to cast toward a void *.
> + },
> + {
> + .compatible = "ti,omap5430-bandgap",
> + .data = (void *)&omap5430_data,
> + },
> + /* Sentinel */
> + { },
> +};
> +
> +static struct omap_bandgap *omap_bandgap_build(struct platform_device *pdev)
> +{
> + struct device_node *node = pdev->dev.of_node;
> + const struct of_device_id *of_id;
> + struct omap_bandgap *bg_ptr;
bg_ptr is not a super name.
> + u32 prop;
> +
> + /* just for the sake */
> + if (!node) {
> + dev_err(&pdev->dev, "no platform information available\n");
> + return ERR_PTR(-EINVAL);
> + }
Not needed, just do the of_match_device here directly.
> +
> + bg_ptr = devm_kzalloc(&pdev->dev, sizeof(struct omap_bandgap),
> + GFP_KERNEL);
> + if (!bg_ptr) {
> + dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n");
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + of_id = of_match_device(of_omap_bandgap_match,&pdev->dev);
> + if (of_id)
> + bg_ptr->pdata = of_id->data;
Nit: This is not really pdata anymore, so you should maybe remove the
"p" to avoid confusion.
> +
> + if (bg_ptr->pdata->has_tshut) {
> + if (of_property_read_u32(node, "ti,tshut-gpio",&prop)< 0) {
> + dev_err(&pdev->dev, "missing tshut gpio in device tree\n");
> + return ERR_PTR(-EINVAL);
> + }
> + bg_ptr->tshut_gpio = prop;
> + if (!gpio_is_valid(bg_ptr->tshut_gpio)) {
> + dev_err(&pdev->dev, "invalid gpio for tshut (%d)\n",
> + bg_ptr->tshut_gpio);
> + return ERR_PTR(-EINVAL);
> + }
> + }
> +
> + return bg_ptr;
> +}
> +
> +static
> +int __devinit omap_bandgap_probe(struct platform_device *pdev)
> +{
> + struct device *cdev = pdev->dev.parent;
> + struct omap_bandgap *bg_ptr;
> + int clk_rate, ret = 0, i;
> +
> + if (!cdev) {
> + dev_err(&pdev->dev, "no omap control ref in our parent\n");
> + return -EINVAL;
> + }
> +
> + bg_ptr = omap_bandgap_build(pdev);
> + if (IS_ERR_OR_NULL(bg_ptr)) {
> + dev_err(&pdev->dev, "failed to fetch platform data\n");
> + return PTR_ERR(bg_ptr);
> + }
> +
> + if (bg_ptr->pdata->has_talert) {
Nit2: Yeah, in fact instead of pdata, "conf" or "settings" seems to be
more representative of what this structure really contain.
> + ret = omap_bandgap_talert_init(bg_ptr, pdev);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to initialize Talert IRQ\n");
> + return ret;
> + }
> + }
> +
> + if (bg_ptr->pdata->has_tshut) {
> + ret = omap_bandgap_tshut_init(bg_ptr, pdev);
> + if (ret) {
> + dev_err(&pdev->dev,
> + "failed to initialize system tshut IRQ\n");
> + goto free_talert;
> + }
> + }
> +
> + bg_ptr->fclock = clk_get(NULL, bg_ptr->pdata->fclock_name);
That's not good to get a clock without using the local dev alias.
But because of lack of clock DT binding yet, I'm not sure we have the
choice.
> + ret = IS_ERR_OR_NULL(bg_ptr->fclock);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to request fclock reference\n");
> + goto free_irqs;
> + }
> +
> + bg_ptr->div_clk = clk_get(NULL, bg_ptr->pdata->div_ck_name);
> + ret = IS_ERR_OR_NULL(bg_ptr->div_clk);
> + if (ret) {
> + dev_err(&pdev->dev,
> + "failed to request div_ts_ck clock ref\n");
> + goto free_irqs;
> + }
> +
> + bg_ptr->conv_table = bg_ptr->pdata->conv_table;
> + for (i = 0; i< bg_ptr->pdata->sensor_count; i++) {
> + struct temp_sensor_registers *tsr;
> + u32 val;
> +
> + tsr = bg_ptr->pdata->sensors[i].registers;
> + /*
> + * check if the efuse has a non-zero value if not
> + * it is an untrimmed sample and the temperatures
> + * may not be accurate
> + */
> + ret = omap_control_readl(cdev, tsr->bgap_efuse,&val);
> + if (ret || !val)
> + dev_info(&pdev->dev,
> + "Non-trimmed BGAP, Temp not accurate\n");
> + }
> +
> + clk_rate = clk_round_rate(bg_ptr->div_clk,
> + bg_ptr->pdata->sensors[0].ts_data->max_freq);
> + if (clk_rate< bg_ptr->pdata->sensors[0].ts_data->min_freq ||
> + clk_rate == 0xffffffff) {
> + ret = -ENODEV;
> + goto put_clks;
> + }
> +
> + ret = clk_set_rate(bg_ptr->div_clk, clk_rate);
> + if (ret) {
> + dev_err(&pdev->dev, "Cannot set clock rate\n");
> + goto put_clks;
> + }
> +
> + bg_ptr->clk_rate = clk_rate;
> + clk_enable(bg_ptr->fclock);
> +
> + mutex_init(&bg_ptr->bg_mutex);
> + bg_ptr->dev =&pdev->dev;
> + platform_set_drvdata(pdev, bg_ptr);
> +
> + /* 1 clk cycle */
What does that mean exactly?
Regards,
Benoit
> + for (i = 0; i< bg_ptr->pdata->sensor_count; i++)
> + configure_temp_sensor_counter(bg_ptr, i, 1);
> +
> + for (i = 0; i< bg_ptr->pdata->sensor_count; i++) {
> + struct temp_sensor_data *ts_data;
> +
> + ts_data = bg_ptr->pdata->sensors[i].ts_data;
> +
> + temp_sensor_init_talert_thresholds(bg_ptr, i,
> + ts_data->t_hot,
> + ts_data->t_cold);
> + temp_sensor_configure_tshut_hot(bg_ptr, i,
> + ts_data->tshut_hot);
> + temp_sensor_configure_tshut_cold(bg_ptr, i,
> + ts_data->tshut_cold);
> + }
> +
> + enable_continuous_mode(bg_ptr);
> +
> + /* Set .250 seconds time as default counter */
> + for (i = 0; i< bg_ptr->pdata->sensor_count; i++)
> + configure_temp_sensor_counter(bg_ptr, i,
> + bg_ptr->clk_rate / 4);
> +
> + /* Every thing is good? Then expose the sensors */
> + for (i = 0; i< bg_ptr->pdata->sensor_count; i++) {
> + char *domain;
> +
> + domain = bg_ptr->pdata->sensors[i].domain;
> + if (bg_ptr->pdata->expose_sensor)
> + bg_ptr->pdata->expose_sensor(bg_ptr, i, domain);
> + }
> +
> + return 0;
> +
> +put_clks:
> + clk_disable(bg_ptr->fclock);
> + clk_put(bg_ptr->fclock);
> + clk_put(bg_ptr->div_clk);
> +free_irqs:
> + free_irq(gpio_to_irq(bg_ptr->tshut_gpio), NULL);
> + gpio_free(bg_ptr->tshut_gpio);
> +free_talert:
> + free_irq(bg_ptr->irq, bg_ptr);
> +
> + return ret;
> +}
> +
> +static
> +int __devexit omap_bandgap_remove(struct platform_device *pdev)
> +{
> + struct omap_bandgap *bg_ptr = platform_get_drvdata(pdev);
> +
> + clk_disable(bg_ptr->fclock);
> + clk_put(bg_ptr->fclock);
> + clk_put(bg_ptr->div_clk);
> + free_irq(bg_ptr->irq, bg_ptr);
> + free_irq(gpio_to_irq(bg_ptr->tshut_gpio), NULL);
> + gpio_free(bg_ptr->tshut_gpio);
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM
> +static int omap_bandgap_save_ctxt(struct omap_bandgap *bg_ptr)
> +{
> + struct device *cdev = bg_ptr->dev->parent;
> + int err = 0;
> + int i;
> +
> + for (i = 0; i< bg_ptr->pdata->sensor_count; i++) {
> + struct temp_sensor_registers *tsr;
> + struct temp_sensor_regval *rval;
> +
> + rval = bg_ptr->pdata->sensors[i].regval;
> + tsr = bg_ptr->pdata->sensors[i].registers;
> +
> + err = omap_control_readl(cdev, tsr->bgap_mode_ctrl,
> + &rval->bg_mode_ctrl);
> + err |= omap_control_readl(cdev, tsr->bgap_mask_ctrl,
> + &rval->bg_ctrl);
> + err |= omap_control_readl(cdev, tsr->bgap_counter,
> + &rval->bg_counter);
> + err |= omap_control_readl(cdev, tsr->bgap_threshold,
> + &rval->bg_threshold);
> + err |= omap_control_readl(cdev, tsr->tshut_threshold,
> + &rval->tshut_threshold);
> +
> + if (err)
> + dev_err(bg_ptr->dev, "could not save sensor %d\n", i);
> + }
> +
> + return err ? -EIO : 0;
> +}
> +
> +static int
> +omap_bandgap_force_single_read(struct omap_bandgap *bg_ptr, int id)
> +{
> + struct device *cdev = bg_ptr->dev->parent;
> + struct temp_sensor_registers *tsr;
> + u32 temp = 0, counter = 1000;
> + int err;
> +
> + tsr = bg_ptr->pdata->sensors[id].registers;
> + /* Select single conversion mode */
> + err = omap_control_readl(cdev, tsr->bgap_mode_ctrl,&temp);
> + temp&= ~(1<< __ffs(tsr->mode_ctrl_mask));
> + omap_control_writel(cdev, temp, tsr->bgap_mode_ctrl);
> +
> + /* Start of Conversion = 1 */
> + err |= omap_control_readl(cdev, tsr->temp_sensor_ctrl,&temp);
> + temp |= 1<< __ffs(tsr->bgap_soc_mask);
> + omap_control_writel(cdev, temp, tsr->temp_sensor_ctrl);
> + /* Wait until DTEMP is updated */
> + err |= omap_control_readl(cdev, tsr->temp_sensor_ctrl,&temp);
> + temp&= (tsr->bgap_dtemp_mask);
> + while ((temp == 0)&& --counter) {
> + err |= omap_control_readl(cdev, tsr->temp_sensor_ctrl,&temp);
> + temp&= (tsr->bgap_dtemp_mask);
> + }
> + /* Start of Conversion = 0 */
> + err |= omap_control_readl(cdev, tsr->temp_sensor_ctrl,&temp);
> + temp&= ~(1<< __ffs(tsr->bgap_soc_mask));
> + err |= omap_control_writel(cdev, temp, tsr->temp_sensor_ctrl);
> +
> + return err ? -EIO : 0;
> +}
> +
> +static int omap_bandgap_restore_ctxt(struct omap_bandgap *bg_ptr)
> +{
> + struct device *cdev = bg_ptr->dev->parent;
> + int i, err = 0;
> + u32 temp = 0;
> +
> + for (i = 0; i< bg_ptr->pdata->sensor_count; i++) {
> + struct temp_sensor_registers *tsr;
> + struct temp_sensor_regval *rval;
> + u32 val;
> +
> + rval = bg_ptr->pdata->sensors[i].regval;
> + tsr = bg_ptr->pdata->sensors[i].registers;
> +
> + err = omap_control_readl(cdev, tsr->bgap_counter,&val);
> + if (val == 0) {
> + err |= omap_control_writel(cdev, rval->bg_threshold,
> + tsr->bgap_threshold);
> + err |= omap_control_writel(cdev, rval->tshut_threshold,
> + tsr->tshut_threshold);
> + /* Force immediate temperature measurement and update
> + * of the DTEMP field
> + */
> + omap_bandgap_force_single_read(bg_ptr, i);
> + err |= omap_control_writel(cdev, rval->bg_counter,
> + tsr->bgap_counter);
> + err |= omap_control_writel(cdev, rval->bg_mode_ctrl,
> + tsr->bgap_mode_ctrl);
> + err |= omap_control_writel(cdev, rval->bg_ctrl,
> + tsr->bgap_mask_ctrl);
> + } else {
> + err |= omap_control_readl(cdev, tsr->temp_sensor_ctrl,
> + &temp);
> + temp&= (tsr->bgap_dtemp_mask);
> + if (temp == 0) {
> + omap_bandgap_force_single_read(bg_ptr, i);
> + err |= omap_control_readl(cdev,
> + tsr->bgap_mask_ctrl,
> + &temp);
> + temp |= 1<< __ffs(tsr->mode_ctrl_mask);
> + err |= omap_control_writel(cdev, temp,
> + tsr->bgap_mask_ctrl);
> + }
> + }
> + if (err)
> + dev_err(bg_ptr->dev, "could not save sensor %d\n", i);
> + }
> +
> + return err ? -EIO : 0;
> +}
> +
> +static int omap_bandgap_suspend(struct device *dev)
> +{
> + struct omap_bandgap *bg_ptr = dev_get_drvdata(dev);
> + int err;
> +
> + err = omap_bandgap_save_ctxt(bg_ptr);
> + clk_disable(bg_ptr->fclock);
> +
> + return err;
> +}
> +
> +static int omap_bandgap_resume(struct device *dev)
> +{
> + struct omap_bandgap *bg_ptr = dev_get_drvdata(dev);
> +
> + clk_enable(bg_ptr->fclock);
> +
> + return omap_bandgap_restore_ctxt(bg_ptr);
> +}
> +static const struct dev_pm_ops omap_bandgap_dev_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(omap_bandgap_suspend,
> + omap_bandgap_resume)
> +};
> +
> +#define DEV_PM_OPS (&omap_bandgap_dev_pm_ops)
> +#else
> +#define DEV_PM_OPS NULL
> +#endif
> +
> +static struct platform_driver omap_bandgap_sensor_driver = {
> + .probe = omap_bandgap_probe,
> + .remove = omap_bandgap_remove,
> + .driver = {
> + .name = "omap-bandgap",
> + .pm = DEV_PM_OPS,
> + .of_match_table = of_omap_bandgap_match,
> + },
> +};
> +
> +module_platform_driver(omap_bandgap_sensor_driver);
> +early_platform_init("early_omap_temperature",&omap_bandgap_sensor_driver);
> +
> +MODULE_DESCRIPTION("OMAP4+ bandgap temperature sensor driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:omap-bandgap");
> +MODULE_AUTHOR("Texas Instrument Inc.");
> diff --git a/drivers/thermal/omap-bandgap.h b/drivers/thermal/omap-bandgap.h
> new file mode 100644
> index 0000000..12e0d6b
> --- /dev/null
> +++ b/drivers/thermal/omap-bandgap.h
> @@ -0,0 +1,63 @@
> +/*
> + * OMAP4 Bandgap temperature sensor driver
> + *
> + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
> + * Contact:
> + * Eduardo Valentin<eduardo.valentin at ti.com>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * 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., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + *
> + */
> +#ifndef __OMAP_BANDGAP_H
> +#define __OMAP_BANDGAP_H
> +
> +struct omap_bandgap_data;
> +
> +/**
> + * struct omap_bandgap - bandgap device structure
> + * @dev: device pointer
> + * @pdata: platform data with sensor data
> + * @fclock: pointer to functional clock of temperature sensor
> + * @div_clk: pointer to parent clock of temperature sensor fclk
> + * @conv_table: Pointer to adc to temperature conversion table
> + * @bg_mutex: Mutex for sysfs, irq and PM
> + * @irq: MPU Irq number for thermal alert
> + * @tshut_gpio: GPIO where Tshut signal is routed
> + * @clk_rate: Holds current clock rate
> + */
> +struct omap_bandgap {
> + struct device *dev;
> + const struct omap_bandgap_data *pdata;
> + struct clk *fclock;
> + struct clk *div_clk;
> + const int *conv_table;
> + struct mutex bg_mutex; /* Mutex for irq and PM */
> + int irq;
> + int tshut_gpio;
> + u32 clk_rate;
> +};
> +
> +int omap_bandgap_read_thot(struct omap_bandgap *bg_ptr, int id, int *thot);
> +int omap_bandgap_write_thot(struct omap_bandgap *bg_ptr, int id, int val);
> +int omap_bandgap_read_tcold(struct omap_bandgap *bg_ptr, int id, int *tcold);
> +int omap_bandgap_write_tcold(struct omap_bandgap *bg_ptr, int id, int val);
> +int omap_bandgap_read_update_interval(struct omap_bandgap *bg_ptr, int id,
> + int *interval);
> +int omap_bandgap_write_update_interval(struct omap_bandgap *bg_ptr, int id,
> + u32 interval);
> +int omap_bandgap_read_temperature(struct omap_bandgap *bg_ptr, int id,
> + int *temperature);
> +
> +#endif
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