forked from Minki/linux
e9a90d046b
DESCRIPTION Spurious Thermal Alert: Talert can happen randomly while the device remains under the temperature limit defined for this event to trig. This spurious event is caused by a incorrect re-synchronization between clock domains. The comparison between configured threshold and current temperature value can happen while the value is transitioning (metastable), thus causing inappropriate event generation. No spurious event occurs as long as the threshold value stays unchanged. Spurious event can be generated while a thermal alert threshold is modified in CONTROL_BANDGAP_THRESHOLD_MPU/GPU/CORE/DSPEVE/IVA_n. WORKAROUND Spurious event generation can be avoided by performing following sequence when the threshold is modified: 1. Mask the hot/cold events at the thermal IP level. 2. Modify Threshold. 3. Unmask the hot/cold events at the thermal IP level. Signed-off-by: Keerthy <j-keerthy@ti.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
415 lines
16 KiB
C
415 lines
16 KiB
C
/*
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* OMAP4 Bandgap temperature sensor driver
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*
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* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
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* Contact:
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* Eduardo Valentin <eduardo.valentin@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#ifndef __TI_BANDGAP_H
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#define __TI_BANDGAP_H
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/err.h>
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/**
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* DOC: bandgap driver data structure
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* ==================================
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*
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* +----------+----------------+
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* | struct temp_sensor_regval |
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* +---------------------------+
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* * (Array of)
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* |
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* |
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* +-------------------+ +-----------------+
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* | struct ti_bandgap |-->| struct device * |
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* +----------+--------+ +-----------------+
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* |
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* |
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* V
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* +------------------------+
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* | struct ti_bandgap_data |
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* +------------------------+
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* |
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* |
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* * (Array of)
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* +------------+------------------------------------------------------+
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* | +----------+------------+ +-------------------------+ |
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* | | struct ti_temp_sensor |-->| struct temp_sensor_data | |
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* | +-----------------------+ +------------+------------+ |
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* | | |
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* | + |
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* | V |
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* | +----------+-------------------+ |
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* | | struct temp_sensor_registers | |
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* | +------------------------------+ |
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* | |
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* +-------------------------------------------------------------------+
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*
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* Above is a simple diagram describing how the data structure below
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* are organized. For each bandgap device there should be a ti_bandgap_data
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* containing the device instance configuration, as well as, an array of
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* sensors, representing every sensor instance present in this bandgap.
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*/
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/**
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* struct temp_sensor_registers - descriptor to access registers and bitfields
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* @temp_sensor_ctrl: TEMP_SENSOR_CTRL register offset
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* @bgap_tempsoff_mask: mask to temp_sensor_ctrl.tempsoff
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* @bgap_soc_mask: mask to temp_sensor_ctrl.soc
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* @bgap_eocz_mask: mask to temp_sensor_ctrl.eocz
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* @bgap_dtemp_mask: mask to temp_sensor_ctrl.dtemp
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* @bgap_mask_ctrl: BANDGAP_MASK_CTRL register offset
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* @mask_hot_mask: mask to bandgap_mask_ctrl.mask_hot
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* @mask_cold_mask: mask to bandgap_mask_ctrl.mask_cold
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* @mask_sidlemode_mask: mask to bandgap_mask_ctrl.mask_sidlemode
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* @mask_counter_delay_mask: mask to bandgap_mask_ctrl.mask_counter_delay
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* @mask_freeze_mask: mask to bandgap_mask_ctrl.mask_free
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* @mask_clear_mask: mask to bandgap_mask_ctrl.mask_clear
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* @mask_clear_accum_mask: mask to bandgap_mask_ctrl.mask_clear_accum
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* @bgap_mode_ctrl: BANDGAP_MODE_CTRL register offset
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* @mode_ctrl_mask: mask to bandgap_mode_ctrl.mode_ctrl
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* @bgap_counter: BANDGAP_COUNTER register offset
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* @counter_mask: mask to bandgap_counter.counter
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* @bgap_threshold: BANDGAP_THRESHOLD register offset (TALERT thresholds)
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* @threshold_thot_mask: mask to bandgap_threhold.thot
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* @threshold_tcold_mask: mask to bandgap_threhold.tcold
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* @tshut_threshold: TSHUT_THRESHOLD register offset (TSHUT thresholds)
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* @tshut_efuse_mask: mask to tshut_threshold.tshut_efuse
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* @tshut_efuse_shift: shift to tshut_threshold.tshut_efuse
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* @tshut_hot_mask: mask to tshut_threhold.thot
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* @tshut_cold_mask: mask to tshut_threhold.thot
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* @bgap_status: BANDGAP_STATUS register offset
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* @status_clean_stop_mask: mask to bandgap_status.clean_stop
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* @status_bgap_alert_mask: mask to bandgap_status.bandgap_alert
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* @status_hot_mask: mask to bandgap_status.hot
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* @status_cold_mask: mask to bandgap_status.cold
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* @bgap_cumul_dtemp: BANDGAP_CUMUL_DTEMP register offset
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* @ctrl_dtemp_0: CTRL_DTEMP0 register offset
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* @ctrl_dtemp_1: CTRL_DTEMP1 register offset
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* @ctrl_dtemp_2: CTRL_DTEMP2 register offset
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* @ctrl_dtemp_3: CTRL_DTEMP3 register offset
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* @ctrl_dtemp_4: CTRL_DTEMP4 register offset
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* @bgap_efuse: BANDGAP_EFUSE register offset
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*
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* The register offsets and bitfields might change across
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* OMAP and variants versions. Hence this struct serves as a
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* descriptor map on how to access the registers and the bitfields.
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*
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* This descriptor contains registers of all versions of bandgap chips.
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* Not all versions will use all registers, depending on the available
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* features. Please read TRMs for descriptive explanation on each bitfield.
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*/
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struct temp_sensor_registers {
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u32 temp_sensor_ctrl;
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u32 bgap_tempsoff_mask;
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u32 bgap_soc_mask;
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u32 bgap_eocz_mask; /* not used: but needs revisit */
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u32 bgap_dtemp_mask;
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u32 bgap_mask_ctrl;
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u32 mask_hot_mask;
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u32 mask_cold_mask;
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u32 mask_sidlemode_mask; /* not used: but may be needed for pm */
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u32 mask_counter_delay_mask;
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u32 mask_freeze_mask;
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u32 mask_clear_mask; /* not used: but needed for trending */
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u32 mask_clear_accum_mask; /* not used: but needed for trending */
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u32 bgap_mode_ctrl;
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u32 mode_ctrl_mask;
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u32 bgap_counter;
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u32 counter_mask;
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u32 bgap_threshold;
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u32 threshold_thot_mask;
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u32 threshold_tcold_mask;
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u32 tshut_threshold;
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u32 tshut_efuse_mask; /* not used */
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u32 tshut_efuse_shift; /* not used */
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u32 tshut_hot_mask;
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u32 tshut_cold_mask;
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u32 bgap_status;
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u32 status_clean_stop_mask; /* not used: but needed for trending */
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u32 status_bgap_alert_mask; /* not used */
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u32 status_hot_mask;
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u32 status_cold_mask;
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u32 bgap_cumul_dtemp; /* not used: but needed for trending */
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u32 ctrl_dtemp_0; /* not used: but needed for trending */
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u32 ctrl_dtemp_1; /* not used: but needed for trending */
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u32 ctrl_dtemp_2; /* not used: but needed for trending */
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u32 ctrl_dtemp_3; /* not used: but needed for trending */
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u32 ctrl_dtemp_4; /* not used: but needed for trending */
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u32 bgap_efuse;
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};
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/**
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* struct temp_sensor_data - The thresholds and limits for temperature sensors.
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* @tshut_hot: temperature to trigger a thermal reset (initial value)
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* @tshut_cold: temp to get the plat out of reset due to thermal (init val)
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* @t_hot: temperature to trigger a thermal alert (high initial value)
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* @t_cold: temperature to trigger a thermal alert (low initial value)
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* @min_freq: sensor minimum clock rate
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* @max_freq: sensor maximum clock rate
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* @max_temp: sensor maximum temperature
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* @min_temp: sensor minimum temperature
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* @hyst_val: temperature hysteresis considered while converting ADC values
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* @update_int1: update interval
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* @update_int2: update interval
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*
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* This data structure will hold the required thresholds and temperature limits
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* for a specific temperature sensor, like shutdown temperature, alert
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* temperature, clock / rate used, ADC conversion limits and update intervals
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*/
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struct temp_sensor_data {
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u32 tshut_hot;
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u32 tshut_cold;
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u32 t_hot;
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u32 t_cold;
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u32 min_freq;
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u32 max_freq;
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int max_temp;
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int min_temp;
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int hyst_val;
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u32 update_int1; /* not used */
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u32 update_int2; /* not used */
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};
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struct ti_bandgap_data;
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/**
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* struct temp_sensor_regval - temperature sensor register values and priv data
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* @bg_mode_ctrl: temp sensor control register value
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* @bg_ctrl: bandgap ctrl register value
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* @bg_counter: bandgap counter value
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* @bg_threshold: bandgap threshold register value
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* @tshut_threshold: bandgap tshut register value
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* @data: private data
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*
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* Data structure to save and restore bandgap register set context. Only
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* required registers are shadowed, when needed.
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*/
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struct temp_sensor_regval {
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u32 bg_mode_ctrl;
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u32 bg_ctrl;
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u32 bg_counter;
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u32 bg_threshold;
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u32 tshut_threshold;
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void *data;
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};
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/**
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* struct ti_bandgap - bandgap device structure
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* @dev: struct device pointer
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* @base: io memory base address
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* @conf: struct with bandgap configuration set (# sensors, conv_table, etc)
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* @regval: temperature sensor register values
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* @fclock: pointer to functional clock of temperature sensor
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* @div_clk: pointer to divider clock of temperature sensor fclk
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* @lock: spinlock for ti_bandgap structure
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* @irq: MPU IRQ number for thermal alert
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* @tshut_gpio: GPIO where Tshut signal is routed
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* @clk_rate: Holds current clock rate
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*
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* The bandgap device structure representing the bandgap device instance.
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* It holds most of the dynamic stuff. Configurations and sensor specific
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* entries are inside the @conf structure.
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*/
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struct ti_bandgap {
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struct device *dev;
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void __iomem *base;
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const struct ti_bandgap_data *conf;
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struct temp_sensor_regval *regval;
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struct clk *fclock;
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struct clk *div_clk;
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spinlock_t lock; /* shields this struct */
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int irq;
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int tshut_gpio;
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u32 clk_rate;
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};
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/**
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* struct ti_temp_sensor - bandgap temperature sensor configuration data
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* @ts_data: pointer to struct with thresholds, limits of temperature sensor
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* @registers: pointer to the list of register offsets and bitfields
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* @domain: the name of the domain where the sensor is located
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* @slope: sensor gradient slope info for hotspot extrapolation equation
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* @constant: sensor gradient const info for hotspot extrapolation equation
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* @slope_pcb: sensor gradient slope info for hotspot extrapolation equation
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* with no external influence
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* @constant_pcb: sensor gradient const info for hotspot extrapolation equation
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* with no external influence
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* @register_cooling: function to describe how this sensor is going to be cooled
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* @unregister_cooling: function to release cooling data
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*
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* Data structure to describe a temperature sensor handled by a bandgap device.
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* It should provide configuration details on this sensor, such as how to
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* access the registers affecting this sensor, shadow register buffer, how to
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* assess the gradient from hotspot, how to cooldown the domain when sensor
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* reports too hot temperature.
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*/
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struct ti_temp_sensor {
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struct temp_sensor_data *ts_data;
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struct temp_sensor_registers *registers;
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char *domain;
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/* for hotspot extrapolation */
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const int slope;
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const int constant;
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const int slope_pcb;
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const int constant_pcb;
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int (*register_cooling)(struct ti_bandgap *bgp, int id);
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int (*unregister_cooling)(struct ti_bandgap *bgp, int id);
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};
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/**
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* DOC: ti bandgap feature types
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*
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* TI_BANDGAP_FEATURE_TSHUT - used when the thermal shutdown signal output
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* of a bandgap device instance is routed to the processor. This means
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* the system must react and perform the shutdown by itself (handle an
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* IRQ, for instance).
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*
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* TI_BANDGAP_FEATURE_TSHUT_CONFIG - used when the bandgap device has control
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* over the thermal shutdown configuration. This means that the thermal
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* shutdown thresholds are programmable, for instance.
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*
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* TI_BANDGAP_FEATURE_TALERT - used when the bandgap device instance outputs
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* a signal representing violation of programmable alert thresholds.
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*
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* TI_BANDGAP_FEATURE_MODE_CONFIG - used when it is possible to choose which
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* mode, continuous or one shot, the bandgap device instance will operate.
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*
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* TI_BANDGAP_FEATURE_COUNTER - used when the bandgap device instance allows
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* programming the update interval of its internal state machine.
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*
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* TI_BANDGAP_FEATURE_POWER_SWITCH - used when the bandgap device allows
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* itself to be switched on/off.
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*
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* TI_BANDGAP_FEATURE_CLK_CTRL - used when the clocks feeding the bandgap
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* device are gateable or not.
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*
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* TI_BANDGAP_FEATURE_FREEZE_BIT - used when the bandgap device features
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* a history buffer that its update can be freezed/unfreezed.
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*
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* TI_BANDGAP_FEATURE_COUNTER_DELAY - used when the bandgap device features
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* a delay programming based on distinct values.
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*
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* TI_BANDGAP_FEATURE_HISTORY_BUFFER - used when the bandgap device features
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* a history buffer of temperatures.
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*
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* TI_BANDGAP_FEATURE_ERRATA_814 - used to workaorund when the bandgap device
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* has Errata 814
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* TI_BANDGAP_FEATURE_ERRATA_813 - used to workaorund when the bandgap device
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* has Errata 813
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* TI_BANDGAP_HAS(b, f) - macro to check if a bandgap device is capable of a
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* specific feature (above) or not. Return non-zero, if yes.
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*/
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#define TI_BANDGAP_FEATURE_TSHUT BIT(0)
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#define TI_BANDGAP_FEATURE_TSHUT_CONFIG BIT(1)
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#define TI_BANDGAP_FEATURE_TALERT BIT(2)
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#define TI_BANDGAP_FEATURE_MODE_CONFIG BIT(3)
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#define TI_BANDGAP_FEATURE_COUNTER BIT(4)
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#define TI_BANDGAP_FEATURE_POWER_SWITCH BIT(5)
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#define TI_BANDGAP_FEATURE_CLK_CTRL BIT(6)
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#define TI_BANDGAP_FEATURE_FREEZE_BIT BIT(7)
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#define TI_BANDGAP_FEATURE_COUNTER_DELAY BIT(8)
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#define TI_BANDGAP_FEATURE_HISTORY_BUFFER BIT(9)
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#define TI_BANDGAP_FEATURE_ERRATA_814 BIT(10)
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#define TI_BANDGAP_FEATURE_ERRATA_813 BIT(11)
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#define TI_BANDGAP_HAS(b, f) \
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((b)->conf->features & TI_BANDGAP_FEATURE_ ## f)
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/**
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* struct ti_bandgap_data - ti bandgap data configuration structure
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* @features: a bitwise flag set to describe the device features
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* @conv_table: Pointer to ADC to temperature conversion table
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* @adc_start_val: ADC conversion table starting value
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* @adc_end_val: ADC conversion table ending value
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* @fclock_name: clock name of the functional clock
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* @div_ck_name: clock name of the clock divisor
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* @sensor_count: count of temperature sensor within this bandgap device
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* @report_temperature: callback to report thermal alert to thermal API
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* @expose_sensor: callback to export sensor to thermal API
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* @remove_sensor: callback to destroy sensor from thermal API
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* @sensors: array of sensors present in this bandgap instance
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*
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* This is a data structure which should hold most of the static configuration
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* of a bandgap device instance. It should describe which features this instance
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* is capable of, the clock names to feed this device, the amount of sensors and
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* their configuration representation, and how to export and unexport them to
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* a thermal API.
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*/
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struct ti_bandgap_data {
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unsigned int features;
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const int *conv_table;
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u32 adc_start_val;
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u32 adc_end_val;
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char *fclock_name;
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char *div_ck_name;
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int sensor_count;
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int (*report_temperature)(struct ti_bandgap *bgp, int id);
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int (*expose_sensor)(struct ti_bandgap *bgp, int id, char *domain);
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int (*remove_sensor)(struct ti_bandgap *bgp, int id);
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/* this needs to be at the end */
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struct ti_temp_sensor sensors[];
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};
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int ti_bandgap_read_thot(struct ti_bandgap *bgp, int id, int *thot);
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int ti_bandgap_write_thot(struct ti_bandgap *bgp, int id, int val);
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int ti_bandgap_read_tcold(struct ti_bandgap *bgp, int id, int *tcold);
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int ti_bandgap_write_tcold(struct ti_bandgap *bgp, int id, int val);
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int ti_bandgap_read_update_interval(struct ti_bandgap *bgp, int id,
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int *interval);
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int ti_bandgap_write_update_interval(struct ti_bandgap *bgp, int id,
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u32 interval);
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int ti_bandgap_read_temperature(struct ti_bandgap *bgp, int id,
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int *temperature);
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int ti_bandgap_set_sensor_data(struct ti_bandgap *bgp, int id, void *data);
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void *ti_bandgap_get_sensor_data(struct ti_bandgap *bgp, int id);
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int ti_bandgap_get_trend(struct ti_bandgap *bgp, int id, int *trend);
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#ifdef CONFIG_OMAP4_THERMAL
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extern const struct ti_bandgap_data omap4430_data;
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extern const struct ti_bandgap_data omap4460_data;
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extern const struct ti_bandgap_data omap4470_data;
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#else
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#define omap4430_data NULL
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#define omap4460_data NULL
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#define omap4470_data NULL
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#endif
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#ifdef CONFIG_OMAP5_THERMAL
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extern const struct ti_bandgap_data omap5430_data;
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#else
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#define omap5430_data NULL
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#endif
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#ifdef CONFIG_DRA752_THERMAL
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extern const struct ti_bandgap_data dra752_data;
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#else
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#define dra752_data NULL
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#endif
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#endif
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