/*
 * AGPGART
 * Copyright (C) 2004 Silicon Graphics, Inc.
 * Copyright (C) 2002-2004 Dave Jones
 * Copyright (C) 1999 Jeff Hartmann
 * Copyright (C) 1999 Precision Insight, Inc.
 * Copyright (C) 1999 Xi Graphics, 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
 * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS 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.
 *
 */

#ifndef _AGP_BACKEND_PRIV_H
#define _AGP_BACKEND_PRIV_H 1

#include <asm/agp.h>	/* for flush_agp_cache() */

#define PFX "agpgart: "

//#define AGP_DEBUG 1
#ifdef AGP_DEBUG
#define DBG(x,y...) printk (KERN_DEBUG PFX "%s: " x "\n", __func__ , ## y)
#else
#define DBG(x,y...) do { } while (0)
#endif

extern struct agp_bridge_data *agp_bridge;

enum aper_size_type {
	U8_APER_SIZE,
	U16_APER_SIZE,
	U32_APER_SIZE,
	LVL2_APER_SIZE,
	FIXED_APER_SIZE
};

struct gatt_mask {
	unsigned long mask;
	u32 type;
	/* totally device specific, for integrated chipsets that
	 * might have different types of memory masks.  For other
	 * devices this will probably be ignored */
};

#define AGP_PAGE_DESTROY_UNMAP 1
#define AGP_PAGE_DESTROY_FREE 2

struct aper_size_info_8 {
	int size;
	int num_entries;
	int page_order;
	u8 size_value;
};

struct aper_size_info_16 {
	int size;
	int num_entries;
	int page_order;
	u16 size_value;
};

struct aper_size_info_32 {
	int size;
	int num_entries;
	int page_order;
	u32 size_value;
};

struct aper_size_info_lvl2 {
	int size;
	int num_entries;
	u32 size_value;
};

struct aper_size_info_fixed {
	int size;
	int num_entries;
	int page_order;
};

struct agp_bridge_driver {
	struct module *owner;
	const void *aperture_sizes;
	int num_aperture_sizes;
	enum aper_size_type size_type;
	bool cant_use_aperture;
	bool needs_scratch_page;
	const struct gatt_mask *masks;
	int (*fetch_size)(void);
	int (*configure)(void);
	void (*agp_enable)(struct agp_bridge_data *, u32);
	void (*cleanup)(void);
	void (*tlb_flush)(struct agp_memory *);
	unsigned long (*mask_memory)(struct agp_bridge_data *, dma_addr_t, int);
	void (*cache_flush)(void);
	int (*create_gatt_table)(struct agp_bridge_data *);
	int (*free_gatt_table)(struct agp_bridge_data *);
	int (*insert_memory)(struct agp_memory *, off_t, int);
	int (*remove_memory)(struct agp_memory *, off_t, int);
	struct agp_memory *(*alloc_by_type) (size_t, int);
	void (*free_by_type)(struct agp_memory *);
	struct page *(*agp_alloc_page)(struct agp_bridge_data *);
	int (*agp_alloc_pages)(struct agp_bridge_data *, struct agp_memory *, size_t);
	void (*agp_destroy_page)(struct page *, int flags);
	void (*agp_destroy_pages)(struct agp_memory *);
	int (*agp_type_to_mask_type) (struct agp_bridge_data *, int);
};

struct agp_bridge_data {
	const struct agp_version *version;
	const struct agp_bridge_driver *driver;
	const struct vm_operations_struct *vm_ops;
	void *previous_size;
	void *current_size;
	void *dev_private_data;
	struct pci_dev *dev;
	u32 __iomem *gatt_table;
	u32 *gatt_table_real;
	unsigned long scratch_page;
	struct page *scratch_page_page;
	dma_addr_t scratch_page_dma;
	unsigned long gart_bus_addr;
	unsigned long gatt_bus_addr;
	u32 mode;
	enum chipset_type type;
	unsigned long *key_list;
	atomic_t current_memory_agp;
	atomic_t agp_in_use;
	int max_memory_agp;	/* in number of pages */
	int aperture_size_idx;
	int capndx;
	int flags;
	char major_version;
	char minor_version;
	struct list_head list;
	u32 apbase_config;
	/* list of agp_memory mapped to the aperture */
	struct list_head mapped_list;
	spinlock_t mapped_lock;
};

#define KB(x)	((x) * 1024)
#define MB(x)	(KB (KB (x)))
#define GB(x)	(MB (KB (x)))

#define A_SIZE_8(x)	((struct aper_size_info_8 *) x)
#define A_SIZE_16(x)	((struct aper_size_info_16 *) x)
#define A_SIZE_32(x)	((struct aper_size_info_32 *) x)
#define A_SIZE_LVL2(x)	((struct aper_size_info_lvl2 *) x)
#define A_SIZE_FIX(x)	((struct aper_size_info_fixed *) x)
#define A_IDX8(bridge)	(A_SIZE_8((bridge)->driver->aperture_sizes) + i)
#define A_IDX16(bridge)	(A_SIZE_16((bridge)->driver->aperture_sizes) + i)
#define A_IDX32(bridge)	(A_SIZE_32((bridge)->driver->aperture_sizes) + i)
#define MAXKEY		(4096 * 32)

#define PGE_EMPTY(b, p)	(!(p) || (p) == (unsigned long) (b)->scratch_page)


struct agp_device_ids {
	unsigned short device_id; /* first, to make table easier to read */
	enum chipset_type chipset;
	const char *chipset_name;
	int (*chipset_setup) (struct pci_dev *pdev);	/* used to override generic */
};

/* Driver registration */
struct agp_bridge_data *agp_alloc_bridge(void);
void agp_put_bridge(struct agp_bridge_data *bridge);
int agp_add_bridge(struct agp_bridge_data *bridge);
void agp_remove_bridge(struct agp_bridge_data *bridge);

/* Frontend routines. */
#if IS_ENABLED(CONFIG_DRM_LEGACY)
int agp_frontend_initialize(void);
void agp_frontend_cleanup(void);
#else
static inline int agp_frontend_initialize(void) { return 0; }
static inline void agp_frontend_cleanup(void) {}
#endif

/* Generic routines. */
void agp_generic_enable(struct agp_bridge_data *bridge, u32 mode);
int agp_generic_create_gatt_table(struct agp_bridge_data *bridge);
int agp_generic_free_gatt_table(struct agp_bridge_data *bridge);
struct agp_memory *agp_create_memory(int scratch_pages);
int agp_generic_insert_memory(struct agp_memory *mem, off_t pg_start, int type);
int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type);
struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type);
void agp_generic_free_by_type(struct agp_memory *curr);
struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge);
int agp_generic_alloc_pages(struct agp_bridge_data *agp_bridge,
			    struct agp_memory *memory, size_t page_count);
void agp_generic_destroy_page(struct page *page, int flags);
void agp_generic_destroy_pages(struct agp_memory *memory);
void agp_free_key(int key);
int agp_num_entries(void);
u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 mode, u32 command);
void agp_device_command(u32 command, bool agp_v3);
int agp_3_5_enable(struct agp_bridge_data *bridge);
void global_cache_flush(void);
void get_agp_version(struct agp_bridge_data *bridge);
unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
				      dma_addr_t phys, int type);
int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
				  int type);
struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev);

/* generic functions for user-populated AGP memory types */
struct agp_memory *agp_generic_alloc_user(size_t page_count, int type);
void agp_alloc_page_array(size_t size, struct agp_memory *mem);
static inline void agp_free_page_array(struct agp_memory *mem)
{
	kvfree(mem->pages);
}


/* generic routines for agp>=3 */
int agp3_generic_fetch_size(void);
void agp3_generic_tlbflush(struct agp_memory *mem);
int agp3_generic_configure(void);
void agp3_generic_cleanup(void);

/* GATT allocation. Returns/accepts GATT kernel virtual address. */
#define alloc_gatt_pages(order)		\
	((char *)__get_free_pages(GFP_KERNEL, (order)))
#define free_gatt_pages(table, order)	\
	free_pages((unsigned long)(table), (order))

/* aperture sizes have been standardised since v3 */
#define AGP_GENERIC_SIZES_ENTRIES 11
extern const struct aper_size_info_16 agp3_generic_sizes[];

extern int agp_off;
extern int agp_try_unsupported_boot;

long compat_agp_ioctl(struct file *file, unsigned int cmd, unsigned long arg);

/* Chipset independent registers (from AGP Spec) */
#define AGP_APBASE	0x10
#define AGP_APERTURE_BAR	0

#define AGPSTAT		0x4
#define AGPCMD		0x8
#define AGPNISTAT	0xc
#define AGPCTRL		0x10
#define AGPAPSIZE	0x14
#define AGPNEPG		0x16
#define AGPGARTLO	0x18
#define AGPGARTHI	0x1c
#define AGPNICMD	0x20

#define AGP_MAJOR_VERSION_SHIFT	(20)
#define AGP_MINOR_VERSION_SHIFT	(16)

#define AGPSTAT_RQ_DEPTH	(0xff000000)
#define AGPSTAT_RQ_DEPTH_SHIFT	24

#define AGPSTAT_CAL_MASK	(1<<12|1<<11|1<<10)
#define AGPSTAT_ARQSZ		(1<<15|1<<14|1<<13)
#define AGPSTAT_ARQSZ_SHIFT	13

#define AGPSTAT_SBA		(1<<9)
#define AGPSTAT_AGP_ENABLE	(1<<8)
#define AGPSTAT_FW		(1<<4)
#define AGPSTAT_MODE_3_0	(1<<3)

#define AGPSTAT2_1X		(1<<0)
#define AGPSTAT2_2X		(1<<1)
#define AGPSTAT2_4X		(1<<2)

#define AGPSTAT3_RSVD		(1<<2)
#define AGPSTAT3_8X		(1<<1)
#define AGPSTAT3_4X		(1)

#define AGPCTRL_APERENB		(1<<8)
#define AGPCTRL_GTLBEN		(1<<7)

#define AGP2_RESERVED_MASK 0x00fffcc8
#define AGP3_RESERVED_MASK 0x00ff00c4

#define AGP_ERRATA_FASTWRITES 1<<0
#define AGP_ERRATA_SBA	 1<<1
#define AGP_ERRATA_1X 1<<2

#endif	/* _AGP_BACKEND_PRIV_H */
