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 static int
28 pwm_info(struct nvkm_therm *therm, int *line, int *ctrl, int *indx)
29 {
30 	struct nvkm_subdev *subdev = &therm->subdev;
31 
32 	if (*line == 0x04) {
33 		*ctrl = 0x00e100;
34 		*line = 4;
35 		*indx = 0;
36 	} else
37 	if (*line == 0x09) {
38 		*ctrl = 0x00e100;
39 		*line = 9;
40 		*indx = 1;
41 	} else
42 	if (*line == 0x10) {
43 		*ctrl = 0x00e28c;
44 		*line = 0;
45 		*indx = 0;
46 	} else {
47 		nvkm_error(subdev, "unknown pwm ctrl for gpio %d\n", *line);
48 		return -ENODEV;
49 	}
50 
51 	return 0;
52 }
53 
54 int
55 nv50_fan_pwm_ctrl(struct nvkm_therm *therm, int line, bool enable)
56 {
57 	struct nvkm_device *device = therm->subdev.device;
58 	u32 data = enable ? 0x00000001 : 0x00000000;
59 	int ctrl, id, ret = pwm_info(therm, &line, &ctrl, &id);
60 	if (ret == 0)
61 		nvkm_mask(device, ctrl, 0x00010001 << line, data << line);
62 	return ret;
63 }
64 
65 int
66 nv50_fan_pwm_get(struct nvkm_therm *therm, int line, u32 *divs, u32 *duty)
67 {
68 	struct nvkm_device *device = therm->subdev.device;
69 	int ctrl, id, ret = pwm_info(therm, &line, &ctrl, &id);
70 	if (ret)
71 		return ret;
72 
73 	if (nvkm_rd32(device, ctrl) & (1 << line)) {
74 		*divs = nvkm_rd32(device, 0x00e114 + (id * 8));
75 		*duty = nvkm_rd32(device, 0x00e118 + (id * 8));
76 		return 0;
77 	}
78 
79 	return -EINVAL;
80 }
81 
82 int
83 nv50_fan_pwm_set(struct nvkm_therm *therm, int line, u32 divs, u32 duty)
84 {
85 	struct nvkm_device *device = therm->subdev.device;
86 	int ctrl, id, ret = pwm_info(therm, &line, &ctrl, &id);
87 	if (ret)
88 		return ret;
89 
90 	nvkm_wr32(device, 0x00e114 + (id * 8), divs);
91 	nvkm_wr32(device, 0x00e118 + (id * 8), duty | 0x80000000);
92 	return 0;
93 }
94 
95 int
96 nv50_fan_pwm_clock(struct nvkm_therm *therm, int line)
97 {
98 	struct nvkm_device *device = therm->subdev.device;
99 	int pwm_clock;
100 
101 	/* determine the PWM source clock */
102 	if (device->chipset > 0x50 && device->chipset < 0x94) {
103 		u8 pwm_div = nvkm_rd32(device, 0x410c);
104 		if (nvkm_rd32(device, 0xc040) & 0x800000) {
105 			/* Use the HOST clock (100 MHz)
106 			* Where does this constant(2.4) comes from? */
107 			pwm_clock = (100000000 >> pwm_div) * 10 / 24;
108 		} else {
109 			/* Where does this constant(20) comes from? */
110 			pwm_clock = (device->crystal * 1000) >> pwm_div;
111 			pwm_clock /= 20;
112 		}
113 	} else {
114 		pwm_clock = (device->crystal * 1000) / 20;
115 	}
116 
117 	return pwm_clock;
118 }
119 
120 static void
121 nv50_sensor_setup(struct nvkm_therm *therm)
122 {
123 	struct nvkm_device *device = therm->subdev.device;
124 	nvkm_mask(device, 0x20010, 0x40000000, 0x0);
125 	mdelay(20); /* wait for the temperature to stabilize */
126 }
127 
128 static int
129 nv50_temp_get(struct nvkm_therm *therm)
130 {
131 	struct nvkm_device *device = therm->subdev.device;
132 	struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
133 	int core_temp;
134 
135 	core_temp = nvkm_rd32(device, 0x20014) & 0x3fff;
136 
137 	/* if the slope or the offset is unset, do no use the sensor */
138 	if (!sensor->slope_div || !sensor->slope_mult ||
139 	    !sensor->offset_num || !sensor->offset_den)
140 	    return -ENODEV;
141 
142 	core_temp = core_temp * sensor->slope_mult / sensor->slope_div;
143 	core_temp = core_temp + sensor->offset_num / sensor->offset_den;
144 	core_temp = core_temp + sensor->offset_constant - 8;
145 
146 	/* reserve negative temperatures for errors */
147 	if (core_temp < 0)
148 		core_temp = 0;
149 
150 	return core_temp;
151 }
152 
153 static void
154 nv50_therm_init(struct nvkm_therm *therm)
155 {
156 	nv50_sensor_setup(therm);
157 }
158 
159 static const struct nvkm_therm_func
160 nv50_therm = {
161 	.init = nv50_therm_init,
162 	.intr = nv40_therm_intr,
163 	.pwm_ctrl = nv50_fan_pwm_ctrl,
164 	.pwm_get = nv50_fan_pwm_get,
165 	.pwm_set = nv50_fan_pwm_set,
166 	.pwm_clock = nv50_fan_pwm_clock,
167 	.temp_get = nv50_temp_get,
168 	.program_alarms = nvkm_therm_program_alarms_polling,
169 };
170 
171 int
172 nv50_therm_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
173 	       struct nvkm_therm **ptherm)
174 {
175 	return nvkm_therm_new_(&nv50_therm, device, type, inst, ptherm);
176 }
177