/*
 * 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/if0001.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 = -ENOSYS;

	nvif_ioctl(&ctrl->object, "control pstate info size %d\n", size);
	if (!(ret = nvif_unpack(ret, &data, &size, 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 = -ENODEV;
		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 = -ENOSYS;

	nvif_ioctl(&ctrl->object, "control pstate attr size %d\n", size);
	if (!(ret = nvif_unpack(ret, &data, &size, 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 = -ENOSYS;

	nvif_ioctl(&ctrl->object, "control pstate user size %d\n", size);
	if (!(ret = nvif_unpack(ret, &data, &size, 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_CLASS_CONTROL,
	.base.minver = -1,
	.base.maxver = -1,
	.ctor = nvkm_control_new,
};