/*
 * Copyright 2013 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 <bskeggs@redhat.com>
 */
#include "ctrl.h"

#include <core/client.h>
#include <subdev/clk.h>

#include <nvif/class.h>
#include <nvif/ioctl.h>
#include <nvif/unpack.h>

static int
nvkm_control_mthd_pstate_info(struct nvkm_control *ctrl, void *data, u32 size)
{
        union {
                struct nvif_control_pstate_info_v0 v0;
        } *args = data;
        struct nvkm_clk *clk = ctrl->device->clk;
        int ret;

        nvif_ioctl(&ctrl->object, "control pstate info size %d\n", size);
        if (nvif_unpack(args->v0, 0, 0, false)) {
                nvif_ioctl(&ctrl->object, "control pstate info vers %d\n",
                           args->v0.version);
        } else
                return ret;

        if (clk) {
                args->v0.count = clk->state_nr;
                args->v0.ustate_ac = clk->ustate_ac;
                args->v0.ustate_dc = clk->ustate_dc;
                args->v0.pwrsrc = clk->pwrsrc;
                args->v0.pstate = clk->pstate;
        } else {
                args->v0.count = 0;
                args->v0.ustate_ac = NVIF_CONTROL_PSTATE_INFO_V0_USTATE_DISABLE;
                args->v0.ustate_dc = NVIF_CONTROL_PSTATE_INFO_V0_USTATE_DISABLE;
                args->v0.pwrsrc = -ENOSYS;
                args->v0.pstate = NVIF_CONTROL_PSTATE_INFO_V0_PSTATE_UNKNOWN;
        }

        return 0;
}

static int
nvkm_control_mthd_pstate_attr(struct nvkm_control *ctrl, void *data, u32 size)
{
        union {
                struct nvif_control_pstate_attr_v0 v0;
        } *args = data;
        struct nvkm_clk *clk = ctrl->device->clk;
        const struct nvkm_domain *domain;
        struct nvkm_pstate *pstate;
        struct nvkm_cstate *cstate;
        int i = 0, j = -1;
        u32 lo, hi;
        int ret;

        nvif_ioctl(&ctrl->object, "control pstate attr size %d\n", size);
        if (nvif_unpack(args->v0, 0, 0, false)) {
                nvif_ioctl(&ctrl->object,
                           "control pstate attr vers %d state %d index %d\n",
                           args->v0.version, args->v0.state, args->v0.index);
                if (!clk)
                        return -ENODEV;
                if (args->v0.state < NVIF_CONTROL_PSTATE_ATTR_V0_STATE_CURRENT)
                        return -EINVAL;
                if (args->v0.state >= clk->state_nr)
                        return -EINVAL;
        } else
                return ret;
        domain = clk->domains;

        while (domain->name != nv_clk_src_max) {
                if (domain->mname && ++j == args->v0.index)
                        break;
                domain++;
        }

        if (domain->name == nv_clk_src_max)
                return -EINVAL;

        if (args->v0.state != NVIF_CONTROL_PSTATE_ATTR_V0_STATE_CURRENT) {
                list_for_each_entry(pstate, &clk->states, head) {
                        if (i++ == args->v0.state)
                                break;
                }

                lo = pstate->base.domain[domain->name];
                hi = lo;
                list_for_each_entry(cstate, &pstate->list, head) {
                        lo = min(lo, cstate->domain[domain->name]);
                        hi = max(hi, cstate->domain[domain->name]);
                }

                args->v0.state = pstate->pstate;
        } else {
                lo = max(nvkm_clk_read(clk, domain->name), 0);
                hi = lo;
        }

        snprintf(args->v0.name, sizeof(args->v0.name), "%s", domain->mname);
        snprintf(args->v0.unit, sizeof(args->v0.unit), "MHz");
        args->v0.min = lo / domain->mdiv;
        args->v0.max = hi / domain->mdiv;

        args->v0.index = 0;
        while ((++domain)->name != nv_clk_src_max) {
                if (domain->mname) {
                        args->v0.index = ++j;
                        break;
                }
        }

        return 0;
}

static int
nvkm_control_mthd_pstate_user(struct nvkm_control *ctrl, void *data, u32 size)
{
        union {
                struct nvif_control_pstate_user_v0 v0;
        } *args = data;
        struct nvkm_clk *clk = ctrl->device->clk;
        int ret;

        nvif_ioctl(&ctrl->object, "control pstate user size %d\n", size);
        if (nvif_unpack(args->v0, 0, 0, false)) {
                nvif_ioctl(&ctrl->object,
                           "control pstate user vers %d ustate %d pwrsrc %d\n",
                           args->v0.version, args->v0.ustate, args->v0.pwrsrc);
                if (!clk)
                        return -ENODEV;
        } else
                return ret;

        if (args->v0.pwrsrc >= 0) {
                ret |= nvkm_clk_ustate(clk, args->v0.ustate, args->v0.pwrsrc);
        } else {
                ret |= nvkm_clk_ustate(clk, args->v0.ustate, 0);
                ret |= nvkm_clk_ustate(clk, args->v0.ustate, 1);
        }

        return ret;
}

static int
nvkm_control_mthd(struct nvkm_object *object, u32 mthd, void *data, u32 size)
{
        struct nvkm_control *ctrl = nvkm_control(object);
        switch (mthd) {
        case NVIF_CONTROL_PSTATE_INFO:
                return nvkm_control_mthd_pstate_info(ctrl, data, size);
        case NVIF_CONTROL_PSTATE_ATTR:
                return nvkm_control_mthd_pstate_attr(ctrl, data, size);
        case NVIF_CONTROL_PSTATE_USER:
                return nvkm_control_mthd_pstate_user(ctrl, data, size);
        default:
                break;
        }
        return -EINVAL;
}

static const struct nvkm_object_func
nvkm_control = {
        .mthd = nvkm_control_mthd,
};

static int
nvkm_control_new(struct nvkm_device *device, const struct nvkm_oclass *oclass,
                 void *data, u32 size, struct nvkm_object **pobject)
{
        struct nvkm_control *ctrl;

        if (!(ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL)))
                return -ENOMEM;
        *pobject = &ctrl->object;
        ctrl->device = device;

        nvkm_object_ctor(&nvkm_control, oclass, &ctrl->object);
        return 0;
}

const struct nvkm_device_oclass
nvkm_control_oclass = {
        .base.oclass = NVIF_IOCTL_NEW_V0_CONTROL,
        .base.minver = -1,
        .base.maxver = -1,
        .ctor = nvkm_control_new,
};