1 /*
2  * Copyright 2012 Red Hat Inc.
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: Ben Skeggs
23  * 	    Martin Peres
24  */
25 #include "priv.h"
26 
27 #include <subdev/fuse.h>
28 
29 int
30 g84_temp_get(struct nvkm_therm *therm)
31 {
32 	struct nvkm_device *device = therm->subdev.device;
33 
34 	if (nvkm_fuse_read(device->fuse, 0x1a8) == 1)
35 		return nvkm_rd32(device, 0x20400);
36 	else
37 		return -ENODEV;
38 }
39 
40 void
41 g84_sensor_setup(struct nvkm_therm *therm)
42 {
43 	struct nvkm_device *device = therm->subdev.device;
44 
45 	/* enable temperature reading for cards with insane defaults */
46 	if (nvkm_fuse_read(device->fuse, 0x1a8) == 1) {
47 		nvkm_mask(device, 0x20008, 0x80008000, 0x80000000);
48 		nvkm_mask(device, 0x2000c, 0x80000003, 0x00000000);
49 		mdelay(20); /* wait for the temperature to stabilize */
50 	}
51 }
52 
53 static void
54 g84_therm_program_alarms(struct nvkm_therm *therm)
55 {
56 	struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
57 	struct nvkm_subdev *subdev = &therm->subdev;
58 	struct nvkm_device *device = subdev->device;
59 	unsigned long flags;
60 
61 	spin_lock_irqsave(&therm->sensor.alarm_program_lock, flags);
62 
63 	/* enable RISING and FALLING IRQs for shutdown, THRS 0, 1, 2 and 4 */
64 	nvkm_wr32(device, 0x20000, 0x000003ff);
65 
66 	/* shutdown: The computer should be shutdown when reached */
67 	nvkm_wr32(device, 0x20484, sensor->thrs_shutdown.hysteresis);
68 	nvkm_wr32(device, 0x20480, sensor->thrs_shutdown.temp);
69 
70 	/* THRS_1 : fan boost*/
71 	nvkm_wr32(device, 0x204c4, sensor->thrs_fan_boost.temp);
72 
73 	/* THRS_2 : critical */
74 	nvkm_wr32(device, 0x204c0, sensor->thrs_critical.temp);
75 
76 	/* THRS_4 : down clock */
77 	nvkm_wr32(device, 0x20414, sensor->thrs_down_clock.temp);
78 	spin_unlock_irqrestore(&therm->sensor.alarm_program_lock, flags);
79 
80 	nvkm_debug(subdev,
81 		   "Programmed thresholds [ %d(%d), %d(%d), %d(%d), %d(%d) ]\n",
82 		   sensor->thrs_fan_boost.temp,
83 		   sensor->thrs_fan_boost.hysteresis,
84 		   sensor->thrs_down_clock.temp,
85 		   sensor->thrs_down_clock.hysteresis,
86 		   sensor->thrs_critical.temp,
87 		   sensor->thrs_critical.hysteresis,
88 		   sensor->thrs_shutdown.temp,
89 		   sensor->thrs_shutdown.hysteresis);
90 
91 }
92 
93 /* must be called with alarm_program_lock taken ! */
94 static void
95 g84_therm_threshold_hyst_emulation(struct nvkm_therm *therm,
96 				   uint32_t thrs_reg, u8 status_bit,
97 				   const struct nvbios_therm_threshold *thrs,
98 				   enum nvkm_therm_thrs thrs_name)
99 {
100 	struct nvkm_device *device = therm->subdev.device;
101 	enum nvkm_therm_thrs_direction direction;
102 	enum nvkm_therm_thrs_state prev_state, new_state;
103 	int temp, cur;
104 
105 	prev_state = nvkm_therm_sensor_get_threshold_state(therm, thrs_name);
106 	temp = nvkm_rd32(device, thrs_reg);
107 
108 	/* program the next threshold */
109 	if (temp == thrs->temp) {
110 		nvkm_wr32(device, thrs_reg, thrs->temp - thrs->hysteresis);
111 		new_state = NVKM_THERM_THRS_HIGHER;
112 	} else {
113 		nvkm_wr32(device, thrs_reg, thrs->temp);
114 		new_state = NVKM_THERM_THRS_LOWER;
115 	}
116 
117 	/* fix the state (in case someone reprogrammed the alarms) */
118 	cur = therm->func->temp_get(therm);
119 	if (new_state == NVKM_THERM_THRS_LOWER && cur > thrs->temp)
120 		new_state = NVKM_THERM_THRS_HIGHER;
121 	else if (new_state == NVKM_THERM_THRS_HIGHER &&
122 		cur < thrs->temp - thrs->hysteresis)
123 		new_state = NVKM_THERM_THRS_LOWER;
124 	nvkm_therm_sensor_set_threshold_state(therm, thrs_name, new_state);
125 
126 	/* find the direction */
127 	if (prev_state < new_state)
128 		direction = NVKM_THERM_THRS_RISING;
129 	else if (prev_state > new_state)
130 		direction = NVKM_THERM_THRS_FALLING;
131 	else
132 		return;
133 
134 	/* advertise a change in direction */
135 	nvkm_therm_sensor_event(therm, thrs_name, direction);
136 }
137 
138 static void
139 g84_therm_intr(struct nvkm_therm *therm)
140 {
141 	struct nvkm_subdev *subdev = &therm->subdev;
142 	struct nvkm_device *device = subdev->device;
143 	struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
144 	unsigned long flags;
145 	uint32_t intr;
146 
147 	spin_lock_irqsave(&therm->sensor.alarm_program_lock, flags);
148 
149 	intr = nvkm_rd32(device, 0x20100) & 0x3ff;
150 
151 	/* THRS_4: downclock */
152 	if (intr & 0x002) {
153 		g84_therm_threshold_hyst_emulation(therm, 0x20414, 24,
154 						   &sensor->thrs_down_clock,
155 						   NVKM_THERM_THRS_DOWNCLOCK);
156 		intr &= ~0x002;
157 	}
158 
159 	/* shutdown */
160 	if (intr & 0x004) {
161 		g84_therm_threshold_hyst_emulation(therm, 0x20480, 20,
162 						   &sensor->thrs_shutdown,
163 						   NVKM_THERM_THRS_SHUTDOWN);
164 		intr &= ~0x004;
165 	}
166 
167 	/* THRS_1 : fan boost */
168 	if (intr & 0x008) {
169 		g84_therm_threshold_hyst_emulation(therm, 0x204c4, 21,
170 						   &sensor->thrs_fan_boost,
171 						   NVKM_THERM_THRS_FANBOOST);
172 		intr &= ~0x008;
173 	}
174 
175 	/* THRS_2 : critical */
176 	if (intr & 0x010) {
177 		g84_therm_threshold_hyst_emulation(therm, 0x204c0, 22,
178 						   &sensor->thrs_critical,
179 						   NVKM_THERM_THRS_CRITICAL);
180 		intr &= ~0x010;
181 	}
182 
183 	if (intr)
184 		nvkm_error(subdev, "intr %08x\n", intr);
185 
186 	/* ACK everything */
187 	nvkm_wr32(device, 0x20100, 0xffffffff);
188 	nvkm_wr32(device, 0x1100, 0x10000); /* PBUS */
189 
190 	spin_unlock_irqrestore(&therm->sensor.alarm_program_lock, flags);
191 }
192 
193 void
194 g84_therm_fini(struct nvkm_therm *therm)
195 {
196 	struct nvkm_device *device = therm->subdev.device;
197 
198 	/* Disable PTherm IRQs */
199 	nvkm_wr32(device, 0x20000, 0x00000000);
200 
201 	/* ACK all PTherm IRQs */
202 	nvkm_wr32(device, 0x20100, 0xffffffff);
203 	nvkm_wr32(device, 0x1100, 0x10000); /* PBUS */
204 }
205 
206 static void
207 g84_therm_init(struct nvkm_therm *therm)
208 {
209 	g84_sensor_setup(therm);
210 }
211 
212 static const struct nvkm_therm_func
213 g84_therm = {
214 	.init = g84_therm_init,
215 	.fini = g84_therm_fini,
216 	.intr = g84_therm_intr,
217 	.pwm_ctrl = nv50_fan_pwm_ctrl,
218 	.pwm_get = nv50_fan_pwm_get,
219 	.pwm_set = nv50_fan_pwm_set,
220 	.pwm_clock = nv50_fan_pwm_clock,
221 	.temp_get = g84_temp_get,
222 	.program_alarms = g84_therm_program_alarms,
223 };
224 
225 int
226 g84_therm_new(struct nvkm_device *device, int index, struct nvkm_therm **ptherm)
227 {
228 	struct nvkm_therm *therm;
229 	int ret;
230 
231 	ret = nvkm_therm_new_(&g84_therm, device, index, &therm);
232 	*ptherm = therm;
233 	if (ret)
234 		return ret;
235 
236 	/* init the thresholds */
237 	nvkm_therm_sensor_set_threshold_state(therm, NVKM_THERM_THRS_SHUTDOWN,
238 						     NVKM_THERM_THRS_LOWER);
239 	nvkm_therm_sensor_set_threshold_state(therm, NVKM_THERM_THRS_FANBOOST,
240 						     NVKM_THERM_THRS_LOWER);
241 	nvkm_therm_sensor_set_threshold_state(therm, NVKM_THERM_THRS_CRITICAL,
242 						     NVKM_THERM_THRS_LOWER);
243 	nvkm_therm_sensor_set_threshold_state(therm, NVKM_THERM_THRS_DOWNCLOCK,
244 						     NVKM_THERM_THRS_LOWER);
245 	return 0;
246 }
247