nv50.c

  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
 27static int
 28pwm_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
 54int
 55nv50_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
 65int
 66nv50_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
 82int
 83nv50_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
 95int
 96nv50_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
120static void
121nv50_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
128static int
129nv50_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
153static void
154nv50_therm_init(struct nvkm_therm *therm)
155{
156	nv50_sensor_setup(therm);
157}
158
159static const struct nvkm_therm_func
160nv50_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
171int
172nv50_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}