/*
 * drivers/video/tegra/host/nvhost_channel.h
 *
 * Tegra Graphics Host Channel
 *
 * Copyright (c) 2010-2013, NVIDIA Corporation.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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/>.
 */

#ifndef __NVHOST_CHANNEL_H
#define __NVHOST_CHANNEL_H

#include <linux/cdev.h>
#include <linux/io.h>
#include "nvhost_cdma.h"

#define NVHOST_MAX_WAIT_CHECKS		256
#define NVHOST_MAX_GATHERS		512
#define NVHOST_MAX_HANDLES		1280
#define NVHOST_MAX_POWERGATE_IDS	2

struct nvhost_master;
struct platform_device;
struct nvhost_channel;
struct nvhost_hwctx;
struct nvhost_alloc_obj_ctx_args;
struct nvhost_free_obj_ctx_args;
struct nvhost_alloc_gpfifo_args;
struct nvhost_gpfifo;
struct nvhost_fence;
struct nvhost_wait_args;
struct nvhost_cycle_stats_args;
struct nvhost_zcull_bind_args;
struct nvhost_set_error_notifier;
struct nvhost_set_priority_args;

struct nvhost_zcull_ops {
	int (*bind)(struct nvhost_hwctx *,
		    struct nvhost_zcull_bind_args *args);
};

struct nvhost_channel_ops {
	const char *soc_name;
	int (*init)(struct nvhost_channel *,
		    struct nvhost_master *,
		    int chid);
	int (*submit)(struct nvhost_job *job);
	int (*save_context)(struct nvhost_channel *channel);
	int (*alloc_obj)(struct nvhost_hwctx *,
			struct nvhost_alloc_obj_ctx_args *args);
	int (*free_obj)(struct nvhost_hwctx *,
			struct nvhost_free_obj_ctx_args *args);
	int (*alloc_gpfifo)(struct nvhost_hwctx *,
			struct nvhost_alloc_gpfifo_args *args);
	int (*submit_gpfifo)(struct nvhost_hwctx *,
			struct nvhost_gpfifo *gpfifo,
			u32 num_entries,
			struct nvhost_fence *fence,
			u32 flags);
	int (*set_error_notifier)(struct nvhost_hwctx *hwctx,
			    struct nvhost_set_error_notifier *args);
	int (*set_priority)(struct nvhost_hwctx *hwctx,
			    struct nvhost_set_priority_args *args);
	int (*wait)(struct nvhost_hwctx *,
		    struct nvhost_wait_args *args);
#if defined(CONFIG_TEGRA_GPU_CYCLE_STATS)
	int (*cycle_stats)(struct nvhost_hwctx *,
			struct nvhost_cycle_stats_args *args);
#endif
	struct nvhost_zcull_ops zcull;
	int (*init_gather_filter)(struct nvhost_channel *ch);
};

struct nvhost_channel {
	struct nvhost_channel_ops ops;
	int refcount;
	int chid;
	u32 syncpt_id;
	struct mutex reflock;
	struct mutex submitlock;
	void __iomem *aperture;
	struct nvhost_hwctx *cur_ctx;
	struct device *node;
	struct platform_device *dev;
	struct cdev cdev;
	struct nvhost_hwctx_handler *ctxhandler;
	struct nvhost_cdma cdma;

	/* the address space block here
	 * belongs to the module. but for
	 * now just keep it here */
	struct device *as_node;
	struct cdev as_cdev;
	struct nvhost_as *as;
};

#define channel_op(ch)		(ch->ops)
#define channel_zcull_op(ch)	(ch->ops.zcull)
#define channel_zbc_op(ch)	(ch->zbc)

int nvhost_channel_init(struct nvhost_channel *ch,
	struct nvhost_master *dev, int index);

int nvhost_channel_submit(struct nvhost_job *job);

struct nvhost_channel *nvhost_getchannel(struct nvhost_channel *ch,
		bool force);
void nvhost_putchannel(struct nvhost_channel *ch);
int nvhost_channel_suspend(struct nvhost_channel *ch);

int nvhost_channel_read_reg(struct nvhost_channel *channel,
	struct nvhost_hwctx *hwctx,
	u32 offset, u32 *value);

struct nvhost_channel *nvhost_alloc_channel_internal(int chindex,
	int max_channels, int *current_channel_count);

void nvhost_free_channel_internal(struct nvhost_channel *ch,
	int *current_channel_count);

int nvhost_channel_save_context(struct nvhost_channel *ch);
void nvhost_channel_init_gather_filter(struct nvhost_channel *ch);

struct nvhost_hwctx *nvhost_channel_get_file_hwctx(int fd);

#endif