/*
 * Copyright (C) 2015 Broadcom
 *
 * 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.
 */

#include "drmP.h"
#include "drm_gem_cma_helper.h"

struct vc4_dev {
	struct drm_device *dev;

	struct vc4_hdmi *hdmi;
	struct vc4_hvs *hvs;
	struct vc4_crtc *crtc[3];

	struct drm_fbdev_cma *fbdev;

	/* The kernel-space BO cache.  Tracks buffers that have been
	 * unreferenced by all other users (refcounts of 0!) but not
	 * yet freed, so we can do cheap allocations.
	 */
	struct vc4_bo_cache {
		/* Array of list heads for entries in the BO cache,
		 * based on number of pages, so we can do O(1) lookups
		 * in the cache when allocating.
		 */
		struct list_head *size_list;
		uint32_t size_list_size;

		/* List of all BOs in the cache, ordered by age, so we
		 * can do O(1) lookups when trying to free old
		 * buffers.
		 */
		struct list_head time_list;
		struct work_struct time_work;
		struct timer_list time_timer;
	} bo_cache;

	struct vc4_bo_stats {
		u32 num_allocated;
		u32 size_allocated;
		u32 num_cached;
		u32 size_cached;
	} bo_stats;

	/* Protects bo_cache and the BO stats. */
	struct mutex bo_lock;
};

static inline struct vc4_dev *
to_vc4_dev(struct drm_device *dev)
{
	return (struct vc4_dev *)dev->dev_private;
}

struct vc4_bo {
	struct drm_gem_cma_object base;

	/* List entry for the BO's position in either
	 * vc4_exec_info->unref_list or vc4_dev->bo_cache.time_list
	 */
	struct list_head unref_head;

	/* Time in jiffies when the BO was put in vc4->bo_cache. */
	unsigned long free_time;

	/* List entry for the BO's position in vc4_dev->bo_cache.size_list */
	struct list_head size_head;
};

static inline struct vc4_bo *
to_vc4_bo(struct drm_gem_object *bo)
{
	return (struct vc4_bo *)bo;
}

struct vc4_hvs {
	struct platform_device *pdev;
	void __iomem *regs;
	void __iomem *dlist;
};

struct vc4_plane {
	struct drm_plane base;
};

static inline struct vc4_plane *
to_vc4_plane(struct drm_plane *plane)
{
	return (struct vc4_plane *)plane;
}

enum vc4_encoder_type {
	VC4_ENCODER_TYPE_HDMI,
	VC4_ENCODER_TYPE_VEC,
	VC4_ENCODER_TYPE_DSI0,
	VC4_ENCODER_TYPE_DSI1,
	VC4_ENCODER_TYPE_SMI,
	VC4_ENCODER_TYPE_DPI,
};

struct vc4_encoder {
	struct drm_encoder base;
	enum vc4_encoder_type type;
	u32 clock_select;
};

static inline struct vc4_encoder *
to_vc4_encoder(struct drm_encoder *encoder)
{
	return container_of(encoder, struct vc4_encoder, base);
}

#define HVS_READ(offset) readl(vc4->hvs->regs + offset)
#define HVS_WRITE(offset, val) writel(val, vc4->hvs->regs + offset)

/**
 * _wait_for - magic (register) wait macro
 *
 * Does the right thing for modeset paths when run under kdgb or similar atomic
 * contexts. Note that it's important that we check the condition again after
 * having timed out, since the timeout could be due to preemption or similar and
 * we've never had a chance to check the condition before the timeout.
 */
#define _wait_for(COND, MS, W) ({ \
	unsigned long timeout__ = jiffies + msecs_to_jiffies(MS) + 1;	\
	int ret__ = 0;							\
	while (!(COND)) {						\
		if (time_after(jiffies, timeout__)) {			\
			if (!(COND))					\
				ret__ = -ETIMEDOUT;			\
			break;						\
		}							\
		if (W && drm_can_sleep())  {				\
			msleep(W);					\
		} else {						\
			cpu_relax();					\
		}							\
	}								\
	ret__;								\
})

#define wait_for(COND, MS) _wait_for(COND, MS, 1)

/* vc4_bo.c */
struct drm_gem_object *vc4_create_object(struct drm_device *dev, size_t size);
void vc4_free_object(struct drm_gem_object *gem_obj);
struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size,
			     bool from_cache);
int vc4_dumb_create(struct drm_file *file_priv,
		    struct drm_device *dev,
		    struct drm_mode_create_dumb *args);
struct dma_buf *vc4_prime_export(struct drm_device *dev,
				 struct drm_gem_object *obj, int flags);
int vc4_create_bo_ioctl(struct drm_device *dev, void *data,
			struct drm_file *file_priv);
int vc4_mmap_bo_ioctl(struct drm_device *dev, void *data,
		      struct drm_file *file_priv);
void vc4_bo_cache_init(struct drm_device *dev);
void vc4_bo_cache_destroy(struct drm_device *dev);
int vc4_bo_stats_debugfs(struct seq_file *m, void *arg);

/* vc4_crtc.c */
extern struct platform_driver vc4_crtc_driver;
int vc4_enable_vblank(struct drm_device *dev, unsigned int crtc_id);
void vc4_disable_vblank(struct drm_device *dev, unsigned int crtc_id);
void vc4_cancel_page_flip(struct drm_crtc *crtc, struct drm_file *file);
int vc4_crtc_debugfs_regs(struct seq_file *m, void *arg);

/* vc4_debugfs.c */
int vc4_debugfs_init(struct drm_minor *minor);
void vc4_debugfs_cleanup(struct drm_minor *minor);

/* vc4_drv.c */
void __iomem *vc4_ioremap_regs(struct platform_device *dev, int index);

/* vc4_hdmi.c */
extern struct platform_driver vc4_hdmi_driver;
int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused);

/* vc4_hvs.c */
extern struct platform_driver vc4_hvs_driver;
void vc4_hvs_dump_state(struct drm_device *dev);
int vc4_hvs_debugfs_regs(struct seq_file *m, void *unused);

/* vc4_kms.c */
int vc4_kms_load(struct drm_device *dev);

/* vc4_plane.c */
struct drm_plane *vc4_plane_init(struct drm_device *dev,
				 enum drm_plane_type type);
u32 vc4_plane_write_dlist(struct drm_plane *plane, u32 __iomem *dlist);
u32 vc4_plane_dlist_size(struct drm_plane_state *state);