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