/* SPDX-License-Identifier: GPL-2.0-only */

/*
 *	pci.h
 *
 *	PCI defines and function prototypes
 *	Copyright 1994, Drew Eckhardt
 *	Copyright 1997--1999 Martin Mares <mj@ucw.cz>
 *
 *	For more information, please consult the following manuals (look at
 *	http://www.pcisig.com/ for how to get them):
 *
 *	PCI BIOS Specification
 *	PCI Local Bus Specification
 *	PCI to PCI Bridge Specification
 *	PCI System Design Guide
 */
#ifndef LINUX_PCI_H
#define LINUX_PCI_H

#include <linux/mod_devicetable.h>

#include <linux/pci_regs.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/compiler.h>
#include <driver.h>
#include <errno.h>
#include <io.h>

#include <linux/pci_ids.h>

/* Include architecture-dependent settings and functions */

#include <asm/pci.h>
#define PCI_ANY_ID (~0)

#define PCI_FIND_CAP_TTL	48

/*
 * The PCI interface treats multi-function devices as independent
 * devices.  The slot/function address of each device is encoded
 * in a single byte as follows:
 *
 *	7:3 = slot
 *	2:0 = function
 */
#define PCI_DEVFN(slot, func)	((((slot) & 0x1f) << 3) | ((func) & 0x07))
#define PCI_SLOT(devfn)		(((devfn) >> 3) & 0x1f)
#define PCI_FUNC(devfn)		((devfn) & 0x07)

/*
 *  For PCI devices, the region numbers are assigned this way:
 */
enum {
	/* #0-5: standard PCI resources */
	PCI_STD_RESOURCES,
	PCI_STD_RESOURCE_END = 5,

	/* #6: expansion ROM resource */
	PCI_ROM_RESOURCE,

	/* device specific resources */
#ifdef CONFIG_PCI_IOV
	PCI_IOV_RESOURCES,
	PCI_IOV_RESOURCE_END = PCI_IOV_RESOURCES + PCI_SRIOV_NUM_BARS - 1,
#endif

	/* resources assigned to buses behind the bridge */
#define PCI_BRIDGE_RESOURCE_NUM 4

	PCI_BRIDGE_RESOURCES,
	PCI_BRIDGE_RESOURCE_END = PCI_BRIDGE_RESOURCES +
				  PCI_BRIDGE_RESOURCE_NUM - 1,

	/* total resources associated with a PCI device */
	PCI_NUM_RESOURCES,

	/* preserve this for compatibility */
	DEVICE_COUNT_RESOURCE = PCI_NUM_RESOURCES,
};

/*
 * Error values that may be returned by PCI functions.
 */
#define PCIBIOS_SUCCESSFUL		0x00
#define PCIBIOS_FUNC_NOT_SUPPORTED	0x81
#define PCIBIOS_BAD_VENDOR_ID		0x83
#define PCIBIOS_DEVICE_NOT_FOUND	0x86
#define PCIBIOS_BAD_REGISTER_NUMBER	0x87
#define PCIBIOS_SET_FAILED		0x88
#define PCIBIOS_BUFFER_TOO_SMALL	0x89

/*
 * The pci_dev structure is used to describe PCI devices.
 */
struct pci_dev {
	struct list_head bus_list;	/* node in per-bus list */
	struct pci_bus	*bus;		/* bus this device is on */
	struct pci_bus	*subordinate;	/* bus this device bridges to */
	struct pci_slot	*slot;		/* Physical slot this device is in */
	const struct pci_device_id *id;	/* the id this device matches */

	struct device_d dev;

	unsigned int	devfn;		/* encoded device & function index */
	unsigned short	vendor;
	unsigned short	device;
	unsigned short	subsystem_vendor;
	unsigned short	subsystem_device;
	unsigned int	class;		/* 3 bytes: (base,sub,prog-if) */
	u8		revision;	/* PCI revision, low byte of class word */
	u8		hdr_type;	/* PCI header type (`multi' flag masked out) */

	struct resource resource[DEVICE_COUNT_RESOURCE]; /* I/O and memory regions + expansion ROMs */

	/* Base registers for this device, can be adjusted by
	 * pcibios_fixup() as necessary.
	 */
	unsigned long	base_address[6];
};
#define	to_pci_dev(d) container_of(d, struct pci_dev, dev)

#define pci_resource_start(dev, bar)	((dev)->resource[(bar)].start)
#define pci_resource_end(dev, bar)	((dev)->resource[(bar)].end)
#define pci_resource_flags(dev, bar)	((dev)->resource[(bar)].flags)
#define pci_resource_len(dev,bar) \
	((pci_resource_start((dev), (bar)) == 0 &&	\
	  pci_resource_end((dev), (bar)) ==		\
	  pci_resource_start((dev), (bar))) ? 0 :	\
							\
	 (pci_resource_end((dev), (bar)) -		\
	  pci_resource_start((dev), (bar)) + 1))

enum {
	PCI_BUS_RESOURCE_IO = 0,
	PCI_BUS_RESOURCE_MEM = 1,
	PCI_BUS_RESOURCE_MEM_PREF = 2,
	PCI_BUS_RESOURCE_BUSN = 3,
};
struct pci_bus {
	struct pci_controller *host;	/* associated host controller */
	struct device_d *parent;
	struct pci_bus *parent_bus;	/* parent bus */
	struct list_head node;		/* node in list of buses */
	struct list_head children;	/* list of child buses */
	struct list_head devices;	/* list of devices on this bus */
	struct resource *resource[PCI_BRIDGE_RESOURCE_NUM];

	unsigned char	number;		/* bus number */
	unsigned char	primary;	/* number of primary bridge */
	unsigned char	secondary;	/* number of secondary bridge */
	unsigned char	subordinate;	/* max number of subordinate buses */
};

/* Low-level architecture-dependent routines */

struct pci_ops {
	int (*read)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val);
	int (*write)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val);

	/* return memory address for pci resource */
	resource_size_t (*res_start)(struct pci_bus *bus, resource_size_t res_addr);
};

extern struct pci_ops *pci_ops;

/*
 * Each pci channel is a top-level PCI bus seem by CPU.  A machine  with
 * multiple PCI channels may have multiple PCI host controllers or a
 * single controller supporting multiple channels.
 */
struct pci_controller {
	struct pci_controller *next;
	struct device_d *parent;
	struct pci_bus *bus;

	const struct pci_ops *pci_ops;
	struct resource *mem_resource;
	struct resource *mem_pref_resource;
	unsigned long mem_offset;
	struct resource *io_resource;
	unsigned long io_offset;
	unsigned long io_map_base;

	unsigned int index;

	/* Optional access method for writing the bus number */
	void (*set_busno)(struct pci_controller *host, int busno);
};

struct pci_driver {
	struct list_head node;
	const char *name;
	const struct pci_device_id *id_table;	/* must be non-NULL for probe to be called */
	int  (*probe)  (struct pci_dev *dev, const struct pci_device_id *id);	/* New device inserted */
	void (*remove) (struct pci_dev *dev);	/* Device removed (NULL if not a hot-plug capable driver) */
	struct driver_d	driver;
};

#define	to_pci_driver(drv) container_of(drv, struct pci_driver, driver)

/* these helpers provide future and backwards compatibility
 * for accessing popular PCI BAR info */
#define pci_resource_start(dev, bar)    ((dev)->resource[(bar)].start)

/**
 * DEFINE_PCI_DEVICE_TABLE - macro used to describe a pci device table
 * @_table: device table name
 *
 * This macro is used to create a struct pci_device_id array (a device table)
 * in a generic manner.
 */
#define DEFINE_PCI_DEVICE_TABLE(_table) \
	const struct pci_device_id _table[]

/**
 * PCI_DEVICE - macro used to describe a specific pci device
 * @vend: the 16 bit PCI Vendor ID
 * @dev: the 16 bit PCI Device ID
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific device.  The subvendor and subdevice fields will be set to
 * PCI_ANY_ID.
 */
#define PCI_DEVICE(vend, dev) \
	.vendor = (vend), .device = (dev), \
	.subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID

/**
 * PCI_DEVICE_SUB - macro used to describe a specific PCI device with subsystem
 * @vend: the 16 bit PCI Vendor ID
 * @dev: the 16 bit PCI Device ID
 * @subvend: the 16 bit PCI Subvendor ID
 * @subdev: the 16 bit PCI Subdevice ID
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific device with subsystem information.
 */
#define PCI_DEVICE_SUB(vend, dev, subvend, subdev) \
	.vendor = (vend), .device = (dev), \
	.subvendor = (subvend), .subdevice = (subdev)

/**
 * PCI_DEVICE_CLASS - macro used to describe a specific pci device class
 * @dev_class: the class, subclass, prog-if triple for this device
 * @dev_class_mask: the class mask for this device
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific PCI class.  The vendor, device, subvendor, and subdevice
 * fields will be set to PCI_ANY_ID.
 */
#define PCI_DEVICE_CLASS(dev_class, dev_class_mask) \
	.class = (dev_class), .class_mask = (dev_class_mask), \
	.vendor = PCI_ANY_ID, .device = PCI_ANY_ID, \
	.subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID

/**
 * PCI_VDEVICE - macro used to describe a specific pci device in short form
 * @vend: the vendor name
 * @dev: the 16 bit PCI Device ID
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific PCI device.  The subvendor, and subdevice fields will be set
 * to PCI_ANY_ID. The macro allows the next field to follow as the device
 * private data.
 */

#define PCI_VDEVICE(vend, dev) \
	.vendor = PCI_VENDOR_ID_##vend, .device = (dev), \
	.subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID, 0, 0

int pci_register_driver(struct pci_driver *pdrv);
int pci_register_device(struct pci_dev *pdev);

#define pci_driver_register	pci_register_driver

#define device_pci_driver(drv)			\
	register_driver_macro(device,pci,drv)

extern struct list_head pci_root_buses; /* list of all known PCI buses */

extern void register_pci_controller(struct pci_controller *hose);

int pci_bus_read_config_byte(struct pci_bus *bus, unsigned int devfn,
			     int where, u8 *val);
int pci_bus_read_config_word(struct pci_bus *bus, unsigned int devfn,
			     int where, u16 *val);
int pci_bus_read_config_dword(struct pci_bus *bus, unsigned int devfn,
			      int where, u32 *val);
int pci_bus_write_config_byte(struct pci_bus *bus, unsigned int devfn,
			      int where, u8 val);
int pci_bus_write_config_word(struct pci_bus *bus, unsigned int devfn,
			      int where, u16 val);
int pci_bus_write_config_dword(struct pci_bus *bus, unsigned int devfn,
			       int where, u32 val);

static inline int pci_read_config_byte(const struct pci_dev *dev, int where, u8 *val)
{
	return pci_bus_read_config_byte(dev->bus, dev->devfn, where, val);
}
static inline int pci_read_config_word(const struct pci_dev *dev, int where, u16 *val)
{
	return pci_bus_read_config_word(dev->bus, dev->devfn, where, val);
}
static inline int pci_read_config_dword(const struct pci_dev *dev, int where,
					u32 *val)
{
	return pci_bus_read_config_dword(dev->bus, dev->devfn, where, val);
}
static inline int pci_write_config_byte(const struct pci_dev *dev, int where, u8 val)
{
	return pci_bus_write_config_byte(dev->bus, dev->devfn, where, val);
}
static inline int pci_write_config_word(const struct pci_dev *dev, int where, u16 val)
{
	return pci_bus_write_config_word(dev->bus, dev->devfn, where, val);
}
static inline int pci_write_config_dword(const struct pci_dev *dev, int where,
					 u32 val)
{
	return pci_bus_write_config_dword(dev->bus, dev->devfn, where, val);
}

void pci_set_master(struct pci_dev *dev);
void pci_clear_master(struct pci_dev *dev);
int pci_enable_device(struct pci_dev *dev);

u8 pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap);
u8 pci_find_capability(struct pci_dev *dev, int cap);

extern void __iomem *pci_iomap(struct pci_dev *dev, int bar);

/*
 * The world is not perfect and supplies us with broken PCI devices.
 * For at least a part of these bugs we need a work-around, so both
 * generic (drivers/pci/quirks.c) and per-architecture code can define
 * fixup hooks to be called for particular buggy devices.
 */

struct pci_fixup {
	u16 vendor;			/* Or PCI_ANY_ID */
	u16 device;			/* Or PCI_ANY_ID */
	u32 class;			/* Or PCI_ANY_ID */
	unsigned int class_shift;	/* should be 0, 8, 16 */
	void (*hook)(struct pci_dev *dev);
};

enum pci_fixup_pass {
	pci_fixup_early,	/* Before probing BARs */
	pci_fixup_header,	/* After reading configuration header */
	pci_fixup_enable,	/* pci_enable_device() time */
};

/* Anonymous variables would be nice... */
#define DECLARE_PCI_FIXUP_SECTION(section, name, vendor, device, class,	\
				  class_shift, hook)			\
	static const struct pci_fixup __PASTE(__pci_fixup_##name,__LINE__) __used	\
	__attribute__((__section__(#section), aligned((sizeof(void *)))))    \
		= { vendor, device, class, class_shift, hook };

#define DECLARE_PCI_FIXUP_CLASS_EARLY(vendor, device, class,		\
					 class_shift, hook)		\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_early,			\
		hook, vendor, device, class, class_shift, hook)
#define DECLARE_PCI_FIXUP_CLASS_HEADER(vendor, device, class,		\
					 class_shift, hook)		\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_header,			\
		hook, vendor, device, class, class_shift, hook)
#define DECLARE_PCI_FIXUP_CLASS_ENABLE(vendor, device, class,		\
					 class_shift, hook)		\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_enable,			\
		hook, vendor, device, class, class_shift, hook)

#define DECLARE_PCI_FIXUP_EARLY(vendor, device, hook)			\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_early,			\
		hook, vendor, device, PCI_ANY_ID, 0, hook)
#define DECLARE_PCI_FIXUP_HEADER(vendor, device, hook)			\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_header,			\
		hook, vendor, device, PCI_ANY_ID, 0, hook)
#define DECLARE_PCI_FIXUP_ENABLE(vendor, device, hook)			\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_enable,			\
		hook, vendor, device, PCI_ANY_ID, 0, hook)

void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev);

#ifdef CONFIG_PCI
const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
					 struct pci_dev *dev);
#else
static inline const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
							 struct pci_dev *dev)
{ return NULL; }
#endif

#endif /* LINUX_PCI_H */
