104 lines
3.4 KiB
C
104 lines
3.4 KiB
C
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/*
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* OMAP3 thermal driver.
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*
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* Copyright (C) 2011-2012 Texas Instruments Inc.
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* Copyright (C) 2014 Pavel Machek <pavel@ucw.cz>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Note
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* http://www.ti.com/lit/er/sprz278f/sprz278f.pdf "Advisory
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* 3.1.1.186 MMC OCP Clock Not Gated When Thermal Sensor Is Used"
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*
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* Also TI says:
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* Just be careful when you try to make thermal policy like decisions
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* based on this sensor. Placement of the sensor w.r.t the actual logic
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* generating heat has to be a factor as well. If you are just looking
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* for an approximation temperature (thermometerish kind), you might be
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* ok with this. I am not sure we'd find any TI data around this.. just a
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* heads up.
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*/
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#include "ti-thermal.h"
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#include "ti-bandgap.h"
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/*
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* OMAP34XX has one instance of thermal sensor for MPU
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* need to describe the individual bit fields
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*/
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static struct temp_sensor_registers
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omap34xx_mpu_temp_sensor_registers = {
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.temp_sensor_ctrl = 0,
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.bgap_soc_mask = BIT(8),
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.bgap_eocz_mask = BIT(7),
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.bgap_dtemp_mask = 0x7f,
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.bgap_mode_ctrl = 0,
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.mode_ctrl_mask = BIT(9),
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};
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/* Thresholds and limits for OMAP34XX MPU temperature sensor */
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static struct temp_sensor_data omap34xx_mpu_temp_sensor_data = {
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.min_freq = 32768,
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.max_freq = 32768,
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.max_temp = 125000,
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.min_temp = -40000,
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.hyst_val = 5000,
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};
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/*
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* Temperature values in milli degree celsius
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*/
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static const int
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omap34xx_adc_to_temp[128] = {
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-40000, -40000, -40000, -40000, -40000, -39000, -38000, -36000,
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-34000, -32000, -31000, -29000, -28000, -26000, -25000, -24000,
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-22000, -21000, -19000, -18000, -17000, -15000, -14000, -12000,
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-11000, -9000, -8000, -7000, -5000, -4000, -2000, -1000, 0000,
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1000, 3000, 4000, 5000, 7000, 8000, 10000, 11000, 13000, 14000,
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15000, 17000, 18000, 20000, 21000, 22000, 24000, 25000, 27000,
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28000, 30000, 31000, 32000, 34000, 35000, 37000, 38000, 39000,
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41000, 42000, 44000, 45000, 47000, 48000, 49000, 51000, 52000,
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53000, 55000, 56000, 58000, 59000, 60000, 62000, 63000, 65000,
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66000, 67000, 69000, 70000, 72000, 73000, 74000, 76000, 77000,
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79000, 80000, 81000, 83000, 84000, 85000, 87000, 88000, 89000,
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91000, 92000, 94000, 95000, 96000, 98000, 99000, 100000,
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102000, 103000, 105000, 106000, 107000, 109000, 110000, 111000,
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113000, 114000, 116000, 117000, 118000, 120000, 121000, 122000,
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124000, 124000, 125000, 125000, 125000, 125000, 125000
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};
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/* OMAP34XX data */
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const struct ti_bandgap_data omap34xx_data = {
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.features = TI_BANDGAP_FEATURE_CLK_CTRL | TI_BANDGAP_FEATURE_UNRELIABLE,
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.fclock_name = "ts_fck",
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.div_ck_name = "ts_fck",
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.conv_table = omap34xx_adc_to_temp,
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.adc_start_val = 0,
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.adc_end_val = 127,
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.expose_sensor = ti_thermal_expose_sensor,
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.remove_sensor = ti_thermal_remove_sensor,
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.sensors = {
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{
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.registers = &omap34xx_mpu_temp_sensor_registers,
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.ts_data = &omap34xx_mpu_temp_sensor_data,
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.domain = "cpu",
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.slope = 0,
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.constant = 20000,
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.slope_pcb = 0,
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.constant_pcb = 20000,
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.register_cooling = NULL,
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.unregister_cooling = NULL,
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},
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},
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.sensor_count = 1,
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};
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