/*
 * 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 <subdev/fuse.h>

int
g84_temp_get(struct nvkm_therm *therm)
{
        struct nvkm_device *device = therm->subdev.device;

        if (nvkm_fuse_read(device->fuse, 0x1a8) == 1)
                return nvkm_rd32(device, 0x20400);
        else
                return -ENODEV;
}

void
g84_sensor_setup(struct nvkm_therm *therm)
{
        struct nvkm_device *device = therm->subdev.device;

        /* enable temperature reading for cards with insane defaults */
        if (nvkm_fuse_read(device->fuse, 0x1a8) == 1) {
                nvkm_mask(device, 0x20008, 0x80008000, 0x80000000);
                nvkm_mask(device, 0x2000c, 0x80000003, 0x00000000);
                mdelay(20); /* wait for the temperature to stabilize */
        }
}

static void
g84_therm_program_alarms(struct nvkm_therm *therm)
{
        struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
        struct nvkm_subdev *subdev = &therm->subdev;
        struct nvkm_device *device = subdev->device;
        unsigned long flags;

        spin_lock_irqsave(&therm->sensor.alarm_program_lock, flags);

        /* enable RISING and FALLING IRQs for shutdown, THRS 0, 1, 2 and 4 */
        nvkm_wr32(device, 0x20000, 0x000003ff);

        /* shutdown: The computer should be shutdown when reached */
        nvkm_wr32(device, 0x20484, sensor->thrs_shutdown.hysteresis);
        nvkm_wr32(device, 0x20480, sensor->thrs_shutdown.temp);

        /* THRS_1 : fan boost*/
        nvkm_wr32(device, 0x204c4, sensor->thrs_fan_boost.temp);

        /* THRS_2 : critical */
        nvkm_wr32(device, 0x204c0, sensor->thrs_critical.temp);

        /* THRS_4 : down clock */
        nvkm_wr32(device, 0x20414, sensor->thrs_down_clock.temp);
        spin_unlock_irqrestore(&therm->sensor.alarm_program_lock, flags);

        nvkm_debug(subdev,
                   "Programmed thresholds [ %d(%d), %d(%d), %d(%d), %d(%d) ]\n",
                   sensor->thrs_fan_boost.temp,
                   sensor->thrs_fan_boost.hysteresis,
                   sensor->thrs_down_clock.temp,
                   sensor->thrs_down_clock.hysteresis,
                   sensor->thrs_critical.temp,
                   sensor->thrs_critical.hysteresis,
                   sensor->thrs_shutdown.temp,
                   sensor->thrs_shutdown.hysteresis);

}

/* must be called with alarm_program_lock taken ! */
static void
g84_therm_threshold_hyst_emulation(struct nvkm_therm *therm,
                                   uint32_t thrs_reg, u8 status_bit,
                                   const struct nvbios_therm_threshold *thrs,
                                   enum nvkm_therm_thrs thrs_name)
{
        struct nvkm_device *device = therm->subdev.device;
        enum nvkm_therm_thrs_direction direction;
        enum nvkm_therm_thrs_state prev_state, new_state;
        int temp, cur;

        prev_state = nvkm_therm_sensor_get_threshold_state(therm, thrs_name);
        temp = nvkm_rd32(device, thrs_reg);

        /* program the next threshold */
        if (temp == thrs->temp) {
                nvkm_wr32(device, thrs_reg, thrs->temp - thrs->hysteresis);
                new_state = NVKM_THERM_THRS_HIGHER;
        } else {
                nvkm_wr32(device, thrs_reg, thrs->temp);
                new_state = NVKM_THERM_THRS_LOWER;
        }

        /* fix the state (in case someone reprogrammed the alarms) */
        cur = therm->func->temp_get(therm);
        if (new_state == NVKM_THERM_THRS_LOWER && cur > thrs->temp)
                new_state = NVKM_THERM_THRS_HIGHER;
        else if (new_state == NVKM_THERM_THRS_HIGHER &&
                cur < thrs->temp - thrs->hysteresis)
                new_state = NVKM_THERM_THRS_LOWER;
        nvkm_therm_sensor_set_threshold_state(therm, thrs_name, new_state);

        /* find the direction */
        if (prev_state < new_state)
                direction = NVKM_THERM_THRS_RISING;
        else if (prev_state > new_state)
                direction = NVKM_THERM_THRS_FALLING;
        else
                return;

        /* advertise a change in direction */
        nvkm_therm_sensor_event(therm, thrs_name, direction);
}

static void
g84_therm_intr(struct nvkm_therm *therm)
{
        struct nvkm_subdev *subdev = &therm->subdev;
        struct nvkm_device *device = subdev->device;
        struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
        unsigned long flags;
        uint32_t intr;

        spin_lock_irqsave(&therm->sensor.alarm_program_lock, flags);

        intr = nvkm_rd32(device, 0x20100) & 0x3ff;

        /* THRS_4: downclock */
        if (intr & 0x002) {
                g84_therm_threshold_hyst_emulation(therm, 0x20414, 24,
                                                   &sensor->thrs_down_clock,
                                                   NVKM_THERM_THRS_DOWNCLOCK);
                intr &= ~0x002;
        }

        /* shutdown */
        if (intr & 0x004) {
                g84_therm_threshold_hyst_emulation(therm, 0x20480, 20,
                                                   &sensor->thrs_shutdown,
                                                   NVKM_THERM_THRS_SHUTDOWN);
                intr &= ~0x004;
        }

        /* THRS_1 : fan boost */
        if (intr & 0x008) {
                g84_therm_threshold_hyst_emulation(therm, 0x204c4, 21,
                                                   &sensor->thrs_fan_boost,
                                                   NVKM_THERM_THRS_FANBOOST);
                intr &= ~0x008;
        }

        /* THRS_2 : critical */
        if (intr & 0x010) {
                g84_therm_threshold_hyst_emulation(therm, 0x204c0, 22,
                                                   &sensor->thrs_critical,
                                                   NVKM_THERM_THRS_CRITICAL);
                intr &= ~0x010;
        }

        if (intr)
                nvkm_error(subdev, "intr %08x\n", intr);

        /* ACK everything */
        nvkm_wr32(device, 0x20100, 0xffffffff);
        nvkm_wr32(device, 0x1100, 0x10000); /* PBUS */

        spin_unlock_irqrestore(&therm->sensor.alarm_program_lock, flags);
}

void
g84_therm_fini(struct nvkm_therm *therm)
{
        struct nvkm_device *device = therm->subdev.device;

        /* Disable PTherm IRQs */
        nvkm_wr32(device, 0x20000, 0x00000000);

        /* ACK all PTherm IRQs */
        nvkm_wr32(device, 0x20100, 0xffffffff);
        nvkm_wr32(device, 0x1100, 0x10000); /* PBUS */
}

void
g84_therm_init(struct nvkm_therm *therm)
{
        g84_sensor_setup(therm);
}

static const struct nvkm_therm_func
g84_therm = {
        .init = g84_therm_init,
        .fini = g84_therm_fini,
        .intr = g84_therm_intr,
        .pwm_ctrl = nv50_fan_pwm_ctrl,
        .pwm_get = nv50_fan_pwm_get,
        .pwm_set = nv50_fan_pwm_set,
        .pwm_clock = nv50_fan_pwm_clock,
        .temp_get = g84_temp_get,
        .program_alarms = g84_therm_program_alarms,
};

int
g84_therm_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
              struct nvkm_therm **ptherm)
{
        struct nvkm_therm *therm;
        int ret;

        ret = nvkm_therm_new_(&g84_therm, device, type, inst, &therm);
        *ptherm = therm;
        if (ret)
                return ret;

        /* init the thresholds */
        nvkm_therm_sensor_set_threshold_state(therm, NVKM_THERM_THRS_SHUTDOWN,
                                                     NVKM_THERM_THRS_LOWER);
        nvkm_therm_sensor_set_threshold_state(therm, NVKM_THERM_THRS_FANBOOST,
                                                     NVKM_THERM_THRS_LOWER);
        nvkm_therm_sensor_set_threshold_state(therm, NVKM_THERM_THRS_CRITICAL,
                                                     NVKM_THERM_THRS_LOWER);
        nvkm_therm_sensor_set_threshold_state(therm, NVKM_THERM_THRS_DOWNCLOCK,
                                                     NVKM_THERM_THRS_LOWER);
        return 0;
}