1 /* 2 * OMAP3 thermal driver. 3 * 4 * Copyright (C) 2011-2012 Texas Instruments Inc. 5 * Copyright (C) 2014 Pavel Machek <pavel@ucw.cz> 6 * 7 * This software is licensed under the terms of the GNU General Public 8 * License version 2, as published by the Free Software Foundation, and 9 * may be copied, distributed, and modified under those terms. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * Note 17 * http://www.ti.com/lit/er/sprz278f/sprz278f.pdf "Advisory 18 * 3.1.1.186 MMC OCP Clock Not Gated When Thermal Sensor Is Used" 19 * 20 * Also TI says: 21 * Just be careful when you try to make thermal policy like decisions 22 * based on this sensor. Placement of the sensor w.r.t the actual logic 23 * generating heat has to be a factor as well. If you are just looking 24 * for an approximation temperature (thermometerish kind), you might be 25 * ok with this. I am not sure we'd find any TI data around this.. just a 26 * heads up. 27 */ 28 29 #include "ti-thermal.h" 30 #include "ti-bandgap.h" 31 32 /* 33 * OMAP34XX has one instance of thermal sensor for MPU 34 * need to describe the individual bit fields 35 */ 36 static struct temp_sensor_registers 37 omap34xx_mpu_temp_sensor_registers = { 38 .temp_sensor_ctrl = 0, 39 .bgap_soc_mask = BIT(8), 40 .bgap_eocz_mask = BIT(7), 41 .bgap_dtemp_mask = 0x7f, 42 43 .bgap_mode_ctrl = 0, 44 .mode_ctrl_mask = BIT(9), 45 }; 46 47 /* Thresholds and limits for OMAP34XX MPU temperature sensor */ 48 static struct temp_sensor_data omap34xx_mpu_temp_sensor_data = { 49 .min_freq = 32768, 50 .max_freq = 32768, 51 .max_temp = 125000, 52 .min_temp = -40000, 53 .hyst_val = 5000, 54 }; 55 56 /* 57 * Temperature values in milli degree celsius 58 */ 59 static const int 60 omap34xx_adc_to_temp[128] = { 61 -40000, -40000, -40000, -40000, -40000, -39000, -38000, -36000, 62 -34000, -32000, -31000, -29000, -28000, -26000, -25000, -24000, 63 -22000, -21000, -19000, -18000, -17000, -15000, -14000, -12000, 64 -11000, -9000, -8000, -7000, -5000, -4000, -2000, -1000, 0000, 65 1000, 3000, 4000, 5000, 7000, 8000, 10000, 11000, 13000, 14000, 66 15000, 17000, 18000, 20000, 21000, 22000, 24000, 25000, 27000, 67 28000, 30000, 31000, 32000, 34000, 35000, 37000, 38000, 39000, 68 41000, 42000, 44000, 45000, 47000, 48000, 49000, 51000, 52000, 69 53000, 55000, 56000, 58000, 59000, 60000, 62000, 63000, 65000, 70 66000, 67000, 69000, 70000, 72000, 73000, 74000, 76000, 77000, 71 79000, 80000, 81000, 83000, 84000, 85000, 87000, 88000, 89000, 72 91000, 92000, 94000, 95000, 96000, 98000, 99000, 100000, 73 102000, 103000, 105000, 106000, 107000, 109000, 110000, 111000, 74 113000, 114000, 116000, 117000, 118000, 120000, 121000, 122000, 75 124000, 124000, 125000, 125000, 125000, 125000, 125000 76 }; 77 78 /* OMAP34XX data */ 79 const struct ti_bandgap_data omap34xx_data = { 80 .features = TI_BANDGAP_FEATURE_CLK_CTRL | TI_BANDGAP_FEATURE_UNRELIABLE, 81 .fclock_name = "ts_fck", 82 .div_ck_name = "ts_fck", 83 .conv_table = omap34xx_adc_to_temp, 84 .adc_start_val = 0, 85 .adc_end_val = 127, 86 .expose_sensor = ti_thermal_expose_sensor, 87 .remove_sensor = ti_thermal_remove_sensor, 88 89 .sensors = { 90 { 91 .registers = &omap34xx_mpu_temp_sensor_registers, 92 .ts_data = &omap34xx_mpu_temp_sensor_data, 93 .domain = "cpu", 94 .slope = 0, 95 .constant = 20000, 96 .slope_pcb = 0, 97 .constant_pcb = 20000, 98 .register_cooling = NULL, 99 .unregister_cooling = NULL, 100 }, 101 }, 102 .sensor_count = 1, 103 }; 104 105 /* 106 * OMAP36XX has one instance of thermal sensor for MPU 107 * need to describe the individual bit fields 108 */ 109 static struct temp_sensor_registers 110 omap36xx_mpu_temp_sensor_registers = { 111 .temp_sensor_ctrl = 0, 112 .bgap_soc_mask = BIT(9), 113 .bgap_eocz_mask = BIT(8), 114 .bgap_dtemp_mask = 0xFF, 115 116 .bgap_mode_ctrl = 0, 117 .mode_ctrl_mask = BIT(10), 118 }; 119 120 /* Thresholds and limits for OMAP36XX MPU temperature sensor */ 121 static struct temp_sensor_data omap36xx_mpu_temp_sensor_data = { 122 .min_freq = 32768, 123 .max_freq = 32768, 124 .max_temp = 125000, 125 .min_temp = -40000, 126 .hyst_val = 5000, 127 }; 128 129 /* 130 * Temperature values in milli degree celsius 131 */ 132 static const int 133 omap36xx_adc_to_temp[128] = { 134 -40000, -40000, -40000, -40000, -40000, -40000, -40000, -40000, 135 -40000, -40000, -40000, -40000, -40000, -38000, -35000, -34000, 136 -32000, -30000, -28000, -26000, -24000, -22000, -20000, -18500, 137 -17000, -15000, -13500, -12000, -10000, -8000, -6500, -5000, -3500, 138 -1500, 0, 2000, 3500, 5000, 6500, 8500, 10000, 12000, 13500, 139 15000, 17000, 19000, 21000, 23000, 25000, 27000, 28500, 30000, 140 32000, 33500, 35000, 37000, 38500, 40000, 42000, 43500, 45000, 141 47000, 48500, 50000, 52000, 53500, 55000, 57000, 58500, 60000, 142 62000, 64000, 66000, 68000, 70000, 71500, 73500, 75000, 77000, 143 78500, 80000, 82000, 83500, 85000, 87000, 88500, 90000, 92000, 144 93500, 95000, 97000, 98500, 100000, 102000, 103500, 105000, 107000, 145 109000, 111000, 113000, 115000, 117000, 118500, 120000, 122000, 146 123500, 125000, 125000, 125000, 125000, 125000, 125000, 125000, 147 125000, 125000, 125000, 125000, 125000, 125000, 125000, 125000, 148 125000, 125000, 125000, 125000, 125000, 125000, 125000 149 }; 150 151 /* OMAP36XX data */ 152 const struct ti_bandgap_data omap36xx_data = { 153 .features = TI_BANDGAP_FEATURE_CLK_CTRL | TI_BANDGAP_FEATURE_UNRELIABLE, 154 .fclock_name = "ts_fck", 155 .div_ck_name = "ts_fck", 156 .conv_table = omap36xx_adc_to_temp, 157 .adc_start_val = 0, 158 .adc_end_val = 127, 159 .expose_sensor = ti_thermal_expose_sensor, 160 .remove_sensor = ti_thermal_remove_sensor, 161 162 .sensors = { 163 { 164 .registers = &omap36xx_mpu_temp_sensor_registers, 165 .ts_data = &omap36xx_mpu_temp_sensor_data, 166 .domain = "cpu", 167 .slope = 0, 168 .constant = 20000, 169 .slope_pcb = 0, 170 .constant_pcb = 20000, 171 .register_cooling = NULL, 172 .unregister_cooling = NULL, 173 }, 174 }, 175 .sensor_count = 1, 176 }; 177