1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * OMAP3 thermal driver. 4 * 5 * Copyright (C) 2011-2012 Texas Instruments Inc. 6 * Copyright (C) 2014 Pavel Machek <pavel@ucw.cz> 7 * 8 * Note 9 * http://www.ti.com/lit/er/sprz278f/sprz278f.pdf "Advisory 10 * 3.1.1.186 MMC OCP Clock Not Gated When Thermal Sensor Is Used" 11 * 12 * Also TI says: 13 * Just be careful when you try to make thermal policy like decisions 14 * based on this sensor. Placement of the sensor w.r.t the actual logic 15 * generating heat has to be a factor as well. If you are just looking 16 * for an approximation temperature (thermometerish kind), you might be 17 * ok with this. I am not sure we'd find any TI data around this.. just a 18 * heads up. 19 */ 20 21 #include "ti-thermal.h" 22 #include "ti-bandgap.h" 23 24 /* 25 * OMAP34XX has one instance of thermal sensor for MPU 26 * need to describe the individual bit fields 27 */ 28 static struct temp_sensor_registers 29 omap34xx_mpu_temp_sensor_registers = { 30 .temp_sensor_ctrl = 0, 31 .bgap_soc_mask = BIT(8), 32 .bgap_eocz_mask = BIT(7), 33 .bgap_dtemp_mask = 0x7f, 34 35 .bgap_mode_ctrl = 0, 36 .mode_ctrl_mask = BIT(9), 37 }; 38 39 /* Thresholds and limits for OMAP34XX MPU temperature sensor */ 40 static struct temp_sensor_data omap34xx_mpu_temp_sensor_data = { 41 .min_freq = 32768, 42 .max_freq = 32768, 43 }; 44 45 /* 46 * Temperature values in milli degree celsius 47 */ 48 static const int 49 omap34xx_adc_to_temp[128] = { 50 -40000, -40000, -40000, -40000, -40000, -39000, -38000, -36000, 51 -34000, -32000, -31000, -29000, -28000, -26000, -25000, -24000, 52 -22000, -21000, -19000, -18000, -17000, -15000, -14000, -12000, 53 -11000, -9000, -8000, -7000, -5000, -4000, -2000, -1000, 0000, 54 1000, 3000, 4000, 5000, 7000, 8000, 10000, 11000, 13000, 14000, 55 15000, 17000, 18000, 20000, 21000, 22000, 24000, 25000, 27000, 56 28000, 30000, 31000, 32000, 34000, 35000, 37000, 38000, 39000, 57 41000, 42000, 44000, 45000, 47000, 48000, 49000, 51000, 52000, 58 53000, 55000, 56000, 58000, 59000, 60000, 62000, 63000, 65000, 59 66000, 67000, 69000, 70000, 72000, 73000, 74000, 76000, 77000, 60 79000, 80000, 81000, 83000, 84000, 85000, 87000, 88000, 89000, 61 91000, 92000, 94000, 95000, 96000, 98000, 99000, 100000, 62 102000, 103000, 105000, 106000, 107000, 109000, 110000, 111000, 63 113000, 114000, 116000, 117000, 118000, 120000, 121000, 122000, 64 124000, 124000, 125000, 125000, 125000, 125000, 125000 65 }; 66 67 /* OMAP34XX data */ 68 const struct ti_bandgap_data omap34xx_data = { 69 .features = TI_BANDGAP_FEATURE_CLK_CTRL | TI_BANDGAP_FEATURE_UNRELIABLE, 70 .fclock_name = "ts_fck", 71 .div_ck_name = "ts_fck", 72 .conv_table = omap34xx_adc_to_temp, 73 .adc_start_val = 0, 74 .adc_end_val = 127, 75 .expose_sensor = ti_thermal_expose_sensor, 76 .remove_sensor = ti_thermal_remove_sensor, 77 78 .sensors = { 79 { 80 .registers = &omap34xx_mpu_temp_sensor_registers, 81 .ts_data = &omap34xx_mpu_temp_sensor_data, 82 .domain = "cpu", 83 .slope_pcb = 0, 84 .constant_pcb = 20000, 85 .register_cooling = NULL, 86 .unregister_cooling = NULL, 87 }, 88 }, 89 .sensor_count = 1, 90 }; 91 92 /* 93 * OMAP36XX has one instance of thermal sensor for MPU 94 * need to describe the individual bit fields 95 */ 96 static struct temp_sensor_registers 97 omap36xx_mpu_temp_sensor_registers = { 98 .temp_sensor_ctrl = 0, 99 .bgap_soc_mask = BIT(9), 100 .bgap_eocz_mask = BIT(8), 101 .bgap_dtemp_mask = 0xFF, 102 103 .bgap_mode_ctrl = 0, 104 .mode_ctrl_mask = BIT(10), 105 }; 106 107 /* Thresholds and limits for OMAP36XX MPU temperature sensor */ 108 static struct temp_sensor_data omap36xx_mpu_temp_sensor_data = { 109 .min_freq = 32768, 110 .max_freq = 32768, 111 }; 112 113 /* 114 * Temperature values in milli degree celsius 115 */ 116 static const int 117 omap36xx_adc_to_temp[128] = { 118 -40000, -40000, -40000, -40000, -40000, -40000, -40000, -40000, 119 -40000, -40000, -40000, -40000, -40000, -38000, -35000, -34000, 120 -32000, -30000, -28000, -26000, -24000, -22000, -20000, -18500, 121 -17000, -15000, -13500, -12000, -10000, -8000, -6500, -5000, -3500, 122 -1500, 0, 2000, 3500, 5000, 6500, 8500, 10000, 12000, 13500, 123 15000, 17000, 19000, 21000, 23000, 25000, 27000, 28500, 30000, 124 32000, 33500, 35000, 37000, 38500, 40000, 42000, 43500, 45000, 125 47000, 48500, 50000, 52000, 53500, 55000, 57000, 58500, 60000, 126 62000, 64000, 66000, 68000, 70000, 71500, 73500, 75000, 77000, 127 78500, 80000, 82000, 83500, 85000, 87000, 88500, 90000, 92000, 128 93500, 95000, 97000, 98500, 100000, 102000, 103500, 105000, 107000, 129 109000, 111000, 113000, 115000, 117000, 118500, 120000, 122000, 130 123500, 125000, 125000, 125000, 125000, 125000, 125000, 125000, 131 125000, 125000, 125000, 125000, 125000, 125000, 125000, 125000, 132 125000, 125000, 125000, 125000, 125000, 125000, 125000 133 }; 134 135 /* OMAP36XX data */ 136 const struct ti_bandgap_data omap36xx_data = { 137 .features = TI_BANDGAP_FEATURE_CLK_CTRL | TI_BANDGAP_FEATURE_UNRELIABLE, 138 .fclock_name = "ts_fck", 139 .div_ck_name = "ts_fck", 140 .conv_table = omap36xx_adc_to_temp, 141 .adc_start_val = 0, 142 .adc_end_val = 127, 143 .expose_sensor = ti_thermal_expose_sensor, 144 .remove_sensor = ti_thermal_remove_sensor, 145 146 .sensors = { 147 { 148 .registers = &omap36xx_mpu_temp_sensor_registers, 149 .ts_data = &omap36xx_mpu_temp_sensor_data, 150 .domain = "cpu", 151 .slope_pcb = 0, 152 .constant_pcb = 20000, 153 .register_cooling = NULL, 154 .unregister_cooling = NULL, 155 }, 156 }, 157 .sensor_count = 1, 158 }; 159