/*
 * Copyright (C) 2017 Etnaviv Project
 * Copyright (C) 2017 Zodiac Inflight Innovations
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "etnaviv_gpu.h"

struct etnaviv_pm_domain;

struct etnaviv_pm_signal {
	char name[64];
	u32 data;

	u32 (*sample)(struct etnaviv_gpu *gpu,
	              const struct etnaviv_pm_domain *domain,
	              const struct etnaviv_pm_signal *signal);
};

struct etnaviv_pm_domain {
	char name[64];
	u8 nr_signals;
	const struct etnaviv_pm_signal *signal;
};

struct etnaviv_pm_domain_meta {
	const struct etnaviv_pm_domain *domains;
	u32 nr_domains;
};

static const struct etnaviv_pm_domain doms_3d[] = {
};

static const struct etnaviv_pm_domain doms_2d[] = {
};

static const struct etnaviv_pm_domain doms_vg[] = {
};

static const struct etnaviv_pm_domain_meta doms_meta[] = {
	{
		.nr_domains = ARRAY_SIZE(doms_3d),
		.domains = &doms_3d[0]
	},
	{
		.nr_domains = ARRAY_SIZE(doms_2d),
		.domains = &doms_2d[0]
	},
	{
		.nr_domains = ARRAY_SIZE(doms_vg),
		.domains = &doms_vg[0]
	}
};

int etnaviv_pm_query_dom(struct etnaviv_gpu *gpu,
	struct drm_etnaviv_pm_domain *domain)
{
	const struct etnaviv_pm_domain_meta *meta = &doms_meta[domain->pipe];
	const struct etnaviv_pm_domain *dom;

	if (domain->iter >= meta->nr_domains)
		return -EINVAL;

	dom = meta->domains + domain->iter;

	domain->id = domain->iter;
	domain->nr_signals = dom->nr_signals;
	strncpy(domain->name, dom->name, sizeof(domain->name));

	domain->iter++;
	if (domain->iter == meta->nr_domains)
		domain->iter = 0xff;

	return 0;
}

int etnaviv_pm_query_sig(struct etnaviv_gpu *gpu,
	struct drm_etnaviv_pm_signal *signal)
{
	const struct etnaviv_pm_domain_meta *meta = &doms_meta[signal->pipe];
	const struct etnaviv_pm_domain *dom;
	const struct etnaviv_pm_signal *sig;

	if (signal->domain >= meta->nr_domains)
		return -EINVAL;

	dom = meta->domains + signal->domain;

	if (signal->iter > dom->nr_signals)
		return -EINVAL;

	sig = &dom->signal[signal->iter];

	signal->id = signal->iter;
	strncpy(signal->name, sig->name, sizeof(signal->name));

	signal->iter++;
	if (signal->iter == dom->nr_signals)
		signal->iter = 0xffff;

	return 0;
}

int etnaviv_pm_req_validate(const struct drm_etnaviv_gem_submit_pmr *r,
	u32 exec_state)
{
	const struct etnaviv_pm_domain_meta *meta = &doms_meta[exec_state];
	const struct etnaviv_pm_domain *dom;

	if (r->domain >= meta->nr_domains)
		return -EINVAL;

	dom = meta->domains + r->domain;

	if (r->signal > dom->nr_signals)
		return -EINVAL;

	return 0;
}