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/*
* Copyright 2012 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: Ben Skeggs
* Martin Peres
*/
#include "priv.h"
#include <core/object.h>
#include <core/device.h>
#include <subdev/gpio.h>
#include <subdev/timer.h>
int
nouveau_therm_fan_get(struct nouveau_therm *therm)
{
struct nouveau_therm_priv *priv = (void *)therm;
struct nouveau_gpio *gpio = nouveau_gpio(therm);
struct dcb_gpio_func func;
int card_type = nv_device(therm)->card_type;
u32 divs, duty;
int ret;
if (!priv->fan.pwm_get)
return -ENODEV;
ret = gpio->find(gpio, 0, DCB_GPIO_PWM_FAN, 0xff, &func);
if (ret == 0) {
ret = priv->fan.pwm_get(therm, func.line, &divs, &duty);
if (ret == 0 && divs) {
divs = max(divs, duty);
if (card_type <= NV_40 || (func.log[0] & 1))
duty = divs - duty;
return (duty * 100) / divs;
}
return gpio->get(gpio, 0, func.func, func.line) * 100;
}
return -ENODEV;
}
int
nouveau_therm_fan_set(struct nouveau_therm *therm, int percent)
{
struct nouveau_therm_priv *priv = (void *)therm;
struct nouveau_gpio *gpio = nouveau_gpio(therm);
struct dcb_gpio_func func;
int card_type = nv_device(therm)->card_type;
u32 divs, duty;
int ret;
if (!priv->fan.pwm_set)
return -ENODEV;
if (percent < priv->bios_fan.min_duty)
percent = priv->bios_fan.min_duty;
if (percent > priv->bios_fan.max_duty)
percent = priv->bios_fan.max_duty;
ret = gpio->find(gpio, 0, DCB_GPIO_PWM_FAN, 0xff, &func);
if (ret == 0) {
divs = priv->bios_perf_fan.pwm_divisor;
if (priv->bios_fan.pwm_freq) {
/*XXX: PNVIO clock more than likely... */
divs = 135000 /priv->bios_fan.pwm_freq;
if (nv_device(therm)->chipset < 0xa3)
divs /= 4;
}
duty = ((divs * percent) + 99) / 100;
if (card_type <= NV_40 || (func.log[0] & 1))
duty = divs - duty;
ret = priv->fan.pwm_set(therm, func.line, divs, duty);
return ret;
}
return -ENODEV;
}
int
nouveau_therm_fan_sense(struct nouveau_therm *therm)
{
struct nouveau_timer *ptimer = nouveau_timer(therm);
struct nouveau_gpio *gpio = nouveau_gpio(therm);
struct dcb_gpio_func func;
u32 cycles, cur, prev;
u64 start;
if (gpio->find(gpio, 0, DCB_GPIO_FAN_SENSE, 0xff, &func))
return -ENODEV;
/* Monitor the GPIO input 0x3b for 250ms.
* When the fan spins, it changes the value of GPIO FAN_SENSE.
* We get 4 changes (0 -> 1 -> 0 -> 1 -> [...]) per complete rotation.
*/
start = ptimer->read(ptimer);
prev = gpio->get(gpio, 0, func.func, func.line);
cycles = 0;
do {
cur = gpio->get(gpio, 0, func.func, func.line);
if (prev != cur) {
cycles++;
prev = cur;
}
usleep_range(500, 1000); /* supports 0 < rpm < 7500 */
} while (ptimer->read(ptimer) - start < 250000000);
/* interpolate to get rpm */
return cycles / 4 * 4 * 60;
}
static void
nouveau_therm_fan_set_defaults(struct nouveau_therm *therm)
{
struct nouveau_therm_priv *priv = (void *)therm;
priv->bios_fan.pwm_freq = 0;
priv->bios_fan.min_duty = 0;
priv->bios_fan.max_duty = 100;
}
static void
nouveau_therm_fan_safety_checks(struct nouveau_therm *therm)
{
struct nouveau_therm_priv *priv = (void *)therm;
if (priv->bios_fan.min_duty > 100)
priv->bios_fan.min_duty = 100;
if (priv->bios_fan.max_duty > 100)
priv->bios_fan.max_duty = 100;
if (priv->bios_fan.min_duty > priv->bios_fan.max_duty)
priv->bios_fan.min_duty = priv->bios_fan.max_duty;
}
int
nouveau_therm_fan_ctor(struct nouveau_therm *therm)
{
struct nouveau_therm_priv *priv = (void *)therm;
struct nouveau_bios *bios = nouveau_bios(therm);
nouveau_therm_fan_set_defaults(therm);
nvbios_perf_fan_parse(bios, &priv->bios_perf_fan);
if (nvbios_therm_fan_parse(bios, &priv->bios_fan))
nv_error(therm, "parsing the thermal table failed\n");
nouveau_therm_fan_safety_checks(therm);
return 0;
}
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