1 /*
2  * Copyright 2012 Nouveau Community
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: Martin Peres
23  */
24 #include <subdev/bios.h>
25 #include <subdev/bios/bit.h>
26 #include <subdev/bios/therm.h>
27 
28 static u16
29 therm_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *len, u8 *cnt)
30 {
31 	struct bit_entry bit_P;
32 	u16 therm = 0;
33 
34 	if (!bit_entry(bios, 'P', &bit_P)) {
35 		if (bit_P.version == 1)
36 			therm = nvbios_rd16(bios, bit_P.offset + 12);
37 		else if (bit_P.version == 2)
38 			therm = nvbios_rd16(bios, bit_P.offset + 16);
39 		else
40 			nvkm_error(&bios->subdev,
41 				   "unknown offset for thermal in BIT P %d\n",
42 				   bit_P.version);
43 	}
44 
45 	/* exit now if we haven't found the thermal table */
46 	if (!therm)
47 		return 0x0000;
48 
49 	*ver = nvbios_rd08(bios, therm + 0);
50 	*hdr = nvbios_rd08(bios, therm + 1);
51 	*len = nvbios_rd08(bios, therm + 2);
52 	*cnt = nvbios_rd08(bios, therm + 3);
53 	return therm + nvbios_rd08(bios, therm + 1);
54 }
55 
56 static u16
57 nvbios_therm_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
58 {
59 	u8 hdr, cnt;
60 	u16 therm = therm_table(bios, ver, &hdr, len, &cnt);
61 	if (therm && idx < cnt)
62 		return therm + idx * *len;
63 	return 0x0000;
64 }
65 
66 int
67 nvbios_therm_sensor_parse(struct nvkm_bios *bios,
68 			  enum nvbios_therm_domain domain,
69 			  struct nvbios_therm_sensor *sensor)
70 {
71 	s8 thrs_section, sensor_section, offset;
72 	u8 ver, len, i;
73 	u16 entry;
74 
75 	/* we only support the core domain for now */
76 	if (domain != NVBIOS_THERM_DOMAIN_CORE)
77 		return -EINVAL;
78 
79 	/* Read the entries from the table */
80 	thrs_section = 0;
81 	sensor_section = -1;
82 	i = 0;
83 	while ((entry = nvbios_therm_entry(bios, i++, &ver, &len))) {
84 		s16 value = nvbios_rd16(bios, entry + 1);
85 
86 		switch (nvbios_rd08(bios, entry + 0)) {
87 		case 0x0:
88 			thrs_section = value;
89 			if (value > 0)
90 				return 0; /* we do not try to support ambient */
91 			break;
92 		case 0x01:
93 			sensor_section++;
94 			if (sensor_section == 0) {
95 				offset = ((s8) nvbios_rd08(bios, entry + 2)) / 2;
96 				sensor->offset_constant = offset;
97 			}
98 			break;
99 
100 		case 0x04:
101 			if (thrs_section == 0) {
102 				sensor->thrs_critical.temp = (value & 0xff0) >> 4;
103 				sensor->thrs_critical.hysteresis = value & 0xf;
104 			}
105 			break;
106 
107 		case 0x07:
108 			if (thrs_section == 0) {
109 				sensor->thrs_down_clock.temp = (value & 0xff0) >> 4;
110 				sensor->thrs_down_clock.hysteresis = value & 0xf;
111 			}
112 			break;
113 
114 		case 0x08:
115 			if (thrs_section == 0) {
116 				sensor->thrs_fan_boost.temp = (value & 0xff0) >> 4;
117 				sensor->thrs_fan_boost.hysteresis = value & 0xf;
118 			}
119 			break;
120 
121 		case 0x10:
122 			if (sensor_section == 0)
123 				sensor->offset_num = value;
124 			break;
125 
126 		case 0x11:
127 			if (sensor_section == 0)
128 				sensor->offset_den = value;
129 			break;
130 
131 		case 0x12:
132 			if (sensor_section == 0)
133 				sensor->slope_mult = value;
134 			break;
135 
136 		case 0x13:
137 			if (sensor_section == 0)
138 				sensor->slope_div = value;
139 			break;
140 		case 0x32:
141 			if (thrs_section == 0) {
142 				sensor->thrs_shutdown.temp = (value & 0xff0) >> 4;
143 				sensor->thrs_shutdown.hysteresis = value & 0xf;
144 			}
145 			break;
146 		}
147 	}
148 
149 	return 0;
150 }
151 
152 int
153 nvbios_therm_fan_parse(struct nvkm_bios *bios, struct nvbios_therm_fan *fan)
154 {
155 	struct nvbios_therm_trip_point *cur_trip = NULL;
156 	u8 ver, len, i;
157 	u16 entry;
158 
159 	uint8_t duty_lut[] = { 0, 0, 25, 0, 40, 0, 50, 0,
160 				75, 0, 85, 0, 100, 0, 100, 0 };
161 
162 	i = 0;
163 	fan->nr_fan_trip = 0;
164 	fan->fan_mode = NVBIOS_THERM_FAN_OTHER;
165 	while ((entry = nvbios_therm_entry(bios, i++, &ver, &len))) {
166 		s16 value = nvbios_rd16(bios, entry + 1);
167 
168 		switch (nvbios_rd08(bios, entry + 0)) {
169 		case 0x22:
170 			fan->min_duty = value & 0xff;
171 			fan->max_duty = (value & 0xff00) >> 8;
172 			break;
173 		case 0x24:
174 			fan->nr_fan_trip++;
175 			if (fan->fan_mode > NVBIOS_THERM_FAN_TRIP)
176 				fan->fan_mode = NVBIOS_THERM_FAN_TRIP;
177 			cur_trip = &fan->trip[fan->nr_fan_trip - 1];
178 			cur_trip->hysteresis = value & 0xf;
179 			cur_trip->temp = (value & 0xff0) >> 4;
180 			cur_trip->fan_duty = duty_lut[(value & 0xf000) >> 12];
181 			break;
182 		case 0x25:
183 			cur_trip = &fan->trip[fan->nr_fan_trip - 1];
184 			cur_trip->fan_duty = value;
185 			break;
186 		case 0x26:
187 			if (!fan->pwm_freq)
188 				fan->pwm_freq = value;
189 			break;
190 		case 0x3b:
191 			fan->bump_period = value;
192 			break;
193 		case 0x3c:
194 			fan->slow_down_period = value;
195 			break;
196 		case 0x46:
197 			if (fan->fan_mode > NVBIOS_THERM_FAN_LINEAR)
198 				fan->fan_mode = NVBIOS_THERM_FAN_LINEAR;
199 			fan->linear_min_temp = nvbios_rd08(bios, entry + 1);
200 			fan->linear_max_temp = nvbios_rd08(bios, entry + 2);
201 			break;
202 		}
203 	}
204 
205 	/* starting from fermi, fan management is always linear */
206 	if (bios->subdev.device->card_type >= NV_C0 &&
207 		fan->fan_mode == NVBIOS_THERM_FAN_OTHER) {
208 		fan->fan_mode = NVBIOS_THERM_FAN_LINEAR;
209 	}
210 
211 	return 0;
212 }
213