therm.c

  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
 28static u32
 29therm_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *len, u8 *cnt)
 30{
 31	struct bit_entry bit_P;
 32	u32 therm = 0;
 33
 34	if (!bit_entry(bios, 'P', &bit_P)) {
 35		if (bit_P.version == 1)
 36			therm = nvbios_rd32(bios, bit_P.offset + 12);
 37		else if (bit_P.version == 2)
 38			therm = nvbios_rd32(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 0;
 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
 56static u32
 57nvbios_therm_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
 58{
 59	u8 hdr, cnt;
 60	u32 therm = therm_table(bios, ver, &hdr, len, &cnt);
 61	if (therm && idx < cnt)
 62		return therm + idx * *len;
 63	return 0;
 64}
 65
 66int
 67nvbios_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	u32 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
152int
153nvbios_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	u32 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}