/*
 *      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/pci_regs.h>     /* The pci register defines */

/*
 * 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)

/* Ioctls for /proc/bus/pci/X/Y nodes. */
#define PCIIOC_BASE             ('P' << 24 | 'C' << 16 | 'I' << 8)
#define PCIIOC_CONTROLLER       (PCIIOC_BASE | 0x00)    /* Get controller for PCI device. */
#define PCIIOC_MMAP_IS_IO       (PCIIOC_BASE | 0x01)    /* Set mmap state to I/O space. */
#define PCIIOC_MMAP_IS_MEM      (PCIIOC_BASE | 0x02)    /* Set mmap state to MEM space. */
#define PCIIOC_WRITE_COMBINE    (PCIIOC_BASE | 0x03)    /* Enable/disable write-combining. */

#ifdef __KERNEL__

#include <linux/mod_devicetable.h>

#include <linux/types.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/kobject.h>
#include <asm/atomic.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/irqreturn.h>

/* Include the ID list */
#include <linux/pci_ids.h>

/* pci_slot represents a physical slot */
struct pci_slot {
        struct pci_bus *bus;            /* The bus this slot is on */
        struct list_head list;          /* node in list of slots on this bus */
        struct hotplug_slot *hotplug;   /* Hotplug info (migrate over time) */
        unsigned char number;           /* PCI_SLOT(pci_dev->devfn) */
        struct kobject kobj;
};

static inline const char *pci_slot_name(const struct pci_slot *slot)
{
        return kobject_name(&slot->kobj);
}

/* File state for mmap()s on /proc/bus/pci/X/Y */
enum pci_mmap_state {
        pci_mmap_io,
        pci_mmap_mem
};

/* This defines the direction arg to the DMA mapping routines. */
#define PCI_DMA_BIDIRECTIONAL   0
#define PCI_DMA_TODEVICE        1
#define PCI_DMA_FROMDEVICE      2
#define PCI_DMA_NONE            3

/*
 *  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
};

typedef int __bitwise pci_power_t;

#define PCI_D0          ((pci_power_t __force) 0)
#define PCI_D1          ((pci_power_t __force) 1)
#define PCI_D2          ((pci_power_t __force) 2)
#define PCI_D3hot       ((pci_power_t __force) 3)
#define PCI_D3cold      ((pci_power_t __force) 4)
#define PCI_UNKNOWN     ((pci_power_t __force) 5)
#define PCI_POWER_ERROR ((pci_power_t __force) -1)

#define PCI_PM_D2_DELAY 200
#define PCI_PM_D3_WAIT  10
#define PCI_PM_BUS_WAIT 50

/** The pci_channel state describes connectivity between the CPU and
 *  the pci device.  If some PCI bus between here and the pci device
 *  has crashed or locked up, this info is reflected here.
 */
typedef unsigned int __bitwise pci_channel_state_t;

enum pci_channel_state {
        /* I/O channel is in normal state */
        pci_channel_io_normal = (__force pci_channel_state_t) 1,

        /* I/O to channel is blocked */
        pci_channel_io_frozen = (__force pci_channel_state_t) 2,

        /* PCI card is dead */
        pci_channel_io_perm_failure = (__force pci_channel_state_t) 3,
};

typedef unsigned int __bitwise pcie_reset_state_t;

enum pcie_reset_state {
        /* Reset is NOT asserted (Use to deassert reset) */
        pcie_deassert_reset = (__force pcie_reset_state_t) 1,

        /* Use #PERST to reset PCI-E device */
        pcie_warm_reset = (__force pcie_reset_state_t) 2,

        /* Use PCI-E Hot Reset to reset device */
        pcie_hot_reset = (__force pcie_reset_state_t) 3
};

typedef unsigned short __bitwise pci_dev_flags_t;
enum pci_dev_flags {
        /* INTX_DISABLE in PCI_COMMAND register disables MSI
         * generation too.
         */
        PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG = (__force pci_dev_flags_t) 1,
        /* Device configuration is irrevocably lost if disabled into D3 */
        PCI_DEV_FLAGS_NO_D3 = (__force pci_dev_flags_t) 2,
};

enum pci_irq_reroute_variant {
        INTEL_IRQ_REROUTE_VARIANT = 1,
        MAX_IRQ_REROUTE_VARIANTS = 3
};

typedef unsigned short __bitwise pci_bus_flags_t;
enum pci_bus_flags {
        PCI_BUS_FLAGS_NO_MSI   = (__force pci_bus_flags_t) 1,
        PCI_BUS_FLAGS_NO_MMRBC = (__force pci_bus_flags_t) 2,
};

struct pci_cap_saved_state {
        struct hlist_node next;
        char cap_nr;
        u32 data[0];
};

struct pcie_link_state;
struct pci_vpd;
struct pci_sriov;

/*
 * 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 */

        void            *sysdata;       /* hook for sys-specific extension */
        struct proc_dir_entry *procent; /* device entry in /proc/bus/pci */
        struct pci_slot *slot;          /* Physical slot this device is in */

        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) */
        u8              pcie_type;      /* PCI-E device/port type */
        u8              rom_base_reg;   /* which config register controls the ROM */
        u8              pin;            /* which interrupt pin this device uses */

        struct pci_driver *driver;      /* which driver has allocated this device */
        u64             dma_mask;       /* Mask of the bits of bus address this
                                           device implements.  Normally this is
                                           0xffffffff.  You only need to change
                                           this if your device has broken DMA
                                           or supports 64-bit transfers.  */

        struct device_dma_parameters dma_parms;

        pci_power_t     current_state;  /* Current operating state. In ACPI-speak,
                                           this is D0-D3, D0 being fully functional,
                                           and D3 being off. */
        int             pm_cap;         /* PM capability offset in the
                                           configuration space */
        unsigned int    pme_support:5;  /* Bitmask of states from which PME#
                                           can be generated */
        unsigned int    d1_support:1;   /* Low power state D1 is supported */
        unsigned int    d2_support:1;   /* Low power state D2 is supported */
        unsigned int    no_d1d2:1;      /* Only allow D0 and D3 */

#ifdef CONFIG_PCIEASPM
        struct pcie_link_state  *link_state;    /* ASPM link state. */
#endif

        pci_channel_state_t error_state;        /* current connectivity state */
        struct  device  dev;            /* Generic device interface */

        int             cfg_size;       /* Size of configuration space */

        /*
         * Instead of touching interrupt line and base address registers
         * directly, use the values stored here. They might be different!
         */
        unsigned int    irq;
        struct resource resource[DEVICE_COUNT_RESOURCE]; /* I/O and memory regions + expansion ROMs */

        /* These fields are used by common fixups */
        unsigned int    transparent:1;  /* Transparent PCI bridge */
        unsigned int    multifunction:1;/* Part of multi-function device */
        /* keep track of device state */
        unsigned int    is_added:1;
        unsigned int    is_busmaster:1; /* device is busmaster */
        unsigned int    no_msi:1;       /* device may not use msi */
        unsigned int    block_ucfg_access:1;    /* userspace config space access is blocked */
        unsigned int    broken_parity_status:1; /* Device generates false positive parity */
        unsigned int    irq_reroute_variant:2;  /* device needs IRQ rerouting variant */
        unsigned int    msi_enabled:1;
        unsigned int    msix_enabled:1;
        unsigned int    ari_enabled:1;  /* ARI forwarding */
        unsigned int    is_managed:1;
        unsigned int    is_pcie:1;
        unsigned int    state_saved:1;
        unsigned int    is_physfn:1;
        unsigned int    is_virtfn:1;
        pci_dev_flags_t dev_flags;
        atomic_t        enable_cnt;     /* pci_enable_device has been called */

        u32             saved_config_space[16]; /* config space saved at suspend time */
        struct hlist_head saved_cap_space;
        struct bin_attribute *rom_attr; /* attribute descriptor for sysfs ROM entry */
        int rom_attr_enabled;           /* has display of the rom attribute been enabled? */
        struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file for resources */
        struct bin_attribute *res_attr_wc[DEVICE_COUNT_RESOURCE]; /* sysfs file for WC mapping of resources */
#ifdef CONFIG_PCI_MSI
        struct list_head msi_list;
#endif
        struct pci_vpd *vpd;
#ifdef CONFIG_PCI_IOV
        union {
                struct pci_sriov *sriov;        /* SR-IOV capability related */
                struct pci_dev *physfn; /* the PF this VF is associated with */
        };
#endif
};

extern struct pci_dev *alloc_pci_dev(void);

#define pci_dev_b(n) list_entry(n, struct pci_dev, bus_list)
#define to_pci_dev(n) container_of(n, struct pci_dev, dev)
#define for_each_pci_dev(d) while ((d = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, d)) != NULL)

static inline int pci_channel_offline(struct pci_dev *pdev)
{
        return (pdev->error_state != pci_channel_io_normal);
}

static inline struct pci_cap_saved_state *pci_find_saved_cap(
        struct pci_dev *pci_dev, char cap)
{
        struct pci_cap_saved_state *tmp;
        struct hlist_node *pos;

        hlist_for_each_entry(tmp, pos, &pci_dev->saved_cap_space, next) {
                if (tmp->cap_nr == cap)
                        return tmp;
        }
        return NULL;
}

static inline void pci_add_saved_cap(struct pci_dev *pci_dev,
        struct pci_cap_saved_state *new_cap)
{
        hlist_add_head(&new_cap->next, &pci_dev->saved_cap_space);
}

#ifndef PCI_BUS_NUM_RESOURCES
#define PCI_BUS_NUM_RESOURCES   16
#endif

#define PCI_REGION_FLAG_MASK    0x0fU   /* These bits of resource flags tell us the PCI region flags */

struct pci_bus {
        struct list_head node;          /* node in list of buses */
        struct pci_bus  *parent;        /* parent bus this bridge is on */
        struct list_head children;      /* list of child buses */
        struct list_head devices;       /* list of devices on this bus */
        struct pci_dev  *self;          /* bridge device as seen by parent */
        struct list_head slots;         /* list of slots on this bus */
        struct resource *resource[PCI_BUS_NUM_RESOURCES];
                                        /* address space routed to this bus */

        struct pci_ops  *ops;           /* configuration access functions */
        void            *sysdata;       /* hook for sys-specific extension */
        struct proc_dir_entry *procdir; /* directory entry in /proc/bus/pci */

        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 */

        char            name[48];

        unsigned short  bridge_ctl;     /* manage NO_ISA/FBB/et al behaviors */
        pci_bus_flags_t bus_flags;      /* Inherited by child busses */
        struct device           *bridge;
        struct device           dev;
        struct bin_attribute    *legacy_io; /* legacy I/O for this bus */
        struct bin_attribute    *legacy_mem; /* legacy mem */
        unsigned int            is_added:1;
};

#define pci_bus_b(n)    list_entry(n, struct pci_bus, node)
#define to_pci_bus(n)   container_of(n, struct pci_bus, dev)

/*
 * Returns true if the pci bus is root (behind host-pci bridge),
 * false otherwise
 */
static inline bool pci_is_root_bus(struct pci_bus *pbus)
{
        return !(pbus->parent);
}

#ifdef CONFIG_PCI_MSI
static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev)
{
        return pci_dev->msi_enabled || pci_dev->msix_enabled;
}
#else
static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev) { return false; }
#endif

/*
 * 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

/* 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);
};

/*
 * ACPI needs to be able to access PCI config space before we've done a
 * PCI bus scan and created pci_bus structures.
 */
extern int raw_pci_read(unsigned int domain, unsigned int bus,
                        unsigned int devfn, int reg, int len, u32 *val);
extern int raw_pci_write(unsigned int domain, unsigned int bus,
                        unsigned int devfn, int reg, int len, u32 val);

struct pci_bus_region {
        resource_size_t start;
        resource_size_t end;
};

struct pci_dynids {
        spinlock_t lock;            /* protects list, index */
        struct list_head list;      /* for IDs added at runtime */
};

/* ---------------------------------------------------------------- */
/** PCI Error Recovery System (PCI-ERS).  If a PCI device driver provides
 *  a set of callbacks in struct pci_error_handlers, then that device driver
 *  will be notified of PCI bus errors, and will be driven to recovery
 *  when an error occurs.
 */

typedef unsigned int __bitwise pci_ers_result_t;

enum pci_ers_result {
        /* no result/none/not supported in device driver */
        PCI_ERS_RESULT_NONE = (__force pci_ers_result_t) 1,

        /* Device driver can recover without slot reset */
        PCI_ERS_RESULT_CAN_RECOVER = (__force pci_ers_result_t) 2,

        /* Device driver wants slot to be reset. */
        PCI_ERS_RESULT_NEED_RESET = (__force pci_ers_result_t) 3,

        /* Device has completely failed, is unrecoverable */
        PCI_ERS_RESULT_DISCONNECT = (__force pci_ers_result_t) 4,

        /* Device driver is fully recovered and operational */
        PCI_ERS_RESULT_RECOVERED = (__force pci_ers_result_t) 5,
};

/* PCI bus error event callbacks */
struct pci_error_handlers {
        /* PCI bus error detected on this device */
        pci_ers_result_t (*error_detected)(struct pci_dev *dev,
                                           enum pci_channel_state error);

        /* MMIO has been re-enabled, but not DMA */
        pci_ers_result_t (*mmio_enabled)(struct pci_dev *dev);

        /* PCI Express link has been reset */
        pci_ers_result_t (*link_reset)(struct pci_dev *dev);

        /* PCI slot has been reset */
        pci_ers_result_t (*slot_reset)(struct pci_dev *dev);

        /* Device driver may resume normal operations */
        void (*resume)(struct pci_dev *dev);
};

/* ---------------------------------------------------------------- */

struct module;
struct pci_driver {
        struct list_head node;
        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) */
        int  (*suspend) (struct pci_dev *dev, pm_message_t state);      /* Device suspended */
        int  (*suspend_late) (struct pci_dev *dev, pm_message_t state);
        int  (*resume_early) (struct pci_dev *dev);
        int  (*resume) (struct pci_dev *dev);                   /* Device woken up */
        void (*shutdown) (struct pci_dev *dev);
        struct pci_error_handlers *err_handler;
        struct device_driver    driver;
        struct pci_dynids dynids;
};

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

/**
 * 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[] __devinitconst

/**
 * 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_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
 * @vendor: the vendor name
 * @device: 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(vendor, device)             \
        PCI_VENDOR_ID_##vendor, (device),       \
        PCI_ANY_ID, PCI_ANY_ID, 0, 0

/* these external functions are only available when PCI support is enabled */
#ifdef CONFIG_PCI

extern struct bus_type pci_bus_type;

/* Do NOT directly access these two variables, unless you are arch specific pci
 * code, or pci core code. */
extern struct list_head pci_root_buses; /* list of all known PCI buses */
/* Some device drivers need know if pci is initiated */
extern int no_pci_devices(void);

void pcibios_fixup_bus(struct pci_bus *);
int __must_check pcibios_enable_device(struct pci_dev *, int mask);
char *pcibios_setup(char *str);

/* Used only when drivers/pci/setup.c is used */
void pcibios_align_resource(void *, struct resource *, resource_size_t,
                                resource_size_t);
void pcibios_update_irq(struct pci_dev *, int irq);

/* Generic PCI functions used internally */

extern struct pci_bus *pci_find_bus(int domain, int busnr);
void pci_bus_add_devices(const struct pci_bus *bus);
struct pci_bus *pci_scan_bus_parented(struct device *parent, int bus,
                                      struct pci_ops *ops, void *sysdata);
static inline struct pci_bus * __devinit pci_scan_bus(int bus, struct pci_ops *ops,
                                           void *sysdata)
{
        struct pci_bus *root_bus;
        root_bus = pci_scan_bus_parented(NULL, bus, ops, sysdata);
        if (root_bus)
                pci_bus_add_devices(root_bus);
        return root_bus;
}
struct pci_bus *pci_create_bus(struct device *parent, int bus,
                               struct pci_ops *ops, void *sysdata);
struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
                                int busnr);
struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
                                 const char *name,
                                 struct hotplug_slot *hotplug);
void pci_destroy_slot(struct pci_slot *slot);
void pci_renumber_slot(struct pci_slot *slot, int slot_nr);
int pci_scan_slot(struct pci_bus *bus, int devfn);
struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn);
void pci_device_add(struct pci_dev *dev, struct pci_bus *bus);
unsigned int pci_scan_child_bus(struct pci_bus *bus);
int __must_check pci_bus_add_device(struct pci_dev *dev);
void pci_read_bridge_bases(struct pci_bus *child);
struct resource *pci_find_parent_resource(const struct pci_dev *dev,
                                          struct resource *res);
u8 pci_swizzle_interrupt_pin(struct pci_dev *dev, u8 pin);
int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge);
u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp);
extern struct pci_dev *pci_dev_get(struct pci_dev *dev);
extern void pci_dev_put(struct pci_dev *dev);
extern void pci_remove_bus(struct pci_bus *b);
extern void pci_remove_bus_device(struct pci_dev *dev);
extern void pci_stop_bus_device(struct pci_dev *dev);
void pci_setup_cardbus(struct pci_bus *bus);
extern void pci_sort_breadthfirst(void);

/* Generic PCI functions exported to card drivers */

#ifdef CONFIG_PCI_LEGACY
struct pci_dev __deprecated *pci_find_device(unsigned int vendor,
                                             unsigned int device,
                                             struct pci_dev *from);
struct pci_dev __deprecated *pci_find_slot(unsigned int bus,
                                           unsigned int devfn);
#endif /* CONFIG_PCI_LEGACY */

enum pci_lost_interrupt_reason {
        PCI_LOST_IRQ_NO_INFORMATION = 0,
        PCI_LOST_IRQ_DISABLE_MSI,
        PCI_LOST_IRQ_DISABLE_MSIX,
        PCI_LOST_IRQ_DISABLE_ACPI,
};
enum pci_lost_interrupt_reason pci_lost_interrupt(struct pci_dev *dev);
int pci_find_capability(struct pci_dev *dev, int cap);
int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap);
int pci_find_ext_capability(struct pci_dev *dev, int cap);
int pci_find_ht_capability(struct pci_dev *dev, int ht_cap);
int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap);
struct pci_bus *pci_find_next_bus(const struct pci_bus *from);

struct pci_dev *pci_get_device(unsigned int vendor, unsigned int device,
                                struct pci_dev *from);
struct pci_dev *pci_get_subsys(unsigned int vendor, unsigned int device,
                                unsigned int ss_vendor, unsigned int ss_device,
                                struct pci_dev *from);
struct pci_dev *pci_get_slot(struct pci_bus *bus, unsigned int devfn);
struct pci_dev *pci_get_bus_and_slot(unsigned int bus, unsigned int devfn);
struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from);
int pci_dev_present(const struct pci_device_id *ids);

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(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(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(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(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(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(struct pci_dev *dev, int where,
                                         u32 val)
{
        return pci_bus_write_config_dword(dev->bus, dev->devfn, where, val);
}

int __must_check pci_enable_device(struct pci_dev *dev);
int __must_check pci_enable_device_io(struct pci_dev *dev);
int __must_check pci_enable_device_mem(struct pci_dev *dev);
int __must_check pci_reenable_device(struct pci_dev *);
int __must_check pcim_enable_device(struct pci_dev *pdev);
void pcim_pin_device(struct pci_dev *pdev);

static inline int pci_is_enabled(struct pci_dev *pdev)
{
        return (atomic_read(&pdev->enable_cnt) > 0);
}

static inline int pci_is_managed(struct pci_dev *pdev)
{
        return pdev->is_managed;
}

void pci_disable_device(struct pci_dev *dev);
void pci_set_master(struct pci_dev *dev);
void pci_clear_master(struct pci_dev *dev);
int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state);
#define HAVE_PCI_SET_MWI
int __must_check pci_set_mwi(struct pci_dev *dev);
int pci_try_set_mwi(struct pci_dev *dev);
void pci_clear_mwi(struct pci_dev *dev);
void pci_intx(struct pci_dev *dev, int enable);
void pci_msi_off(struct pci_dev *dev);
int pci_set_dma_mask(struct pci_dev *dev, u64 mask);
int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask);
int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size);
int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask);
int pcix_get_max_mmrbc(struct pci_dev *dev);
int pcix_get_mmrbc(struct pci_dev *dev);
int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc);
int pcie_get_readrq(struct pci_dev *dev);
int pcie_set_readrq(struct pci_dev *dev, int rq);
int pci_reset_function(struct pci_dev *dev);
int pci_execute_reset_function(struct pci_dev *dev);
void pci_update_resource(struct pci_dev *dev, int resno);
int __must_check pci_assign_resource(struct pci_dev *dev, int i);
int pci_select_bars(struct pci_dev *dev, unsigned long flags);

/* ROM control related routines */
int pci_enable_rom(struct pci_dev *pdev);
void pci_disable_rom(struct pci_dev *pdev);
void __iomem __must_check *pci_map_rom(struct pci_dev *pdev, size_t *size);
void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom);
size_t pci_get_rom_size(struct pci_dev *pdev, void __iomem *rom, size_t size);

/* Power management related routines */
int pci_save_state(struct pci_dev *dev);
int pci_restore_state(struct pci_dev *dev);
int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state);
int pci_set_power_state(struct pci_dev *dev, pci_power_t state);
pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state);
bool pci_pme_capable(struct pci_dev *dev, pci_power_t state);
void pci_pme_active(struct pci_dev *dev, bool enable);
int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable);
int pci_wake_from_d3(struct pci_dev *dev, bool enable);
pci_power_t pci_target_state(struct pci_dev *dev);
int pci_prepare_to_sleep(struct pci_dev *dev);
int pci_back_from_sleep(struct pci_dev *dev);

/* Functions for PCI Hotplug drivers to use */
int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap);
#ifdef CONFIG_HOTPLUG
unsigned int pci_rescan_bus(struct pci_bus *bus);
#endif

/* Vital product data routines */
ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
int pci_vpd_truncate(struct pci_dev *dev, size_t size);

/* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
void pci_bus_assign_resources(const struct pci_bus *bus);
void pci_bus_size_bridges(struct pci_bus *bus);
int pci_claim_resource(struct pci_dev *, int);
void pci_assign_unassigned_resources(void);
void pdev_enable_device(struct pci_dev *);
void pdev_sort_resources(struct pci_dev *, struct resource_list *);
int pci_enable_resources(struct pci_dev *, int mask);
void pci_fixup_irqs(u8 (*)(struct pci_dev *, u8 *),
                    int (*)(struct pci_dev *, u8, u8));
#define HAVE_PCI_REQ_REGIONS    2
int __must_check pci_request_regions(struct pci_dev *, const char *);
int __must_check pci_request_regions_exclusive(struct pci_dev *, const char *);
void pci_release_regions(struct pci_dev *);
int __must_check pci_request_region(struct pci_dev *, int, const char *);
int __must_check pci_request_region_exclusive(struct pci_dev *, int, const char *);
void pci_release_region(struct pci_dev *, int);
int pci_request_selected_regions(struct pci_dev *, int, const char *);
int pci_request_selected_regions_exclusive(struct pci_dev *, int, const char *);
void pci_release_selected_regions(struct pci_dev *, int);

/* drivers/pci/bus.c */
int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
                        struct resource *res, resource_size_t size,
                        resource_size_t align, resource_size_t min,
                        unsigned int type_mask,
                        void (*alignf)(void *, struct resource *,
                                resource_size_t, resource_size_t),
                        void *alignf_data);
void pci_enable_bridges(struct pci_bus *bus);

/* Proper probing supporting hot-pluggable devices */
int __must_check __pci_register_driver(struct pci_driver *, struct module *,
                                       const char *mod_name);

/*
 * pci_register_driver must be a macro so that KBUILD_MODNAME can be expanded
 */
#define pci_register_driver(driver)             \
        __pci_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)

void pci_unregister_driver(struct pci_driver *dev);
void pci_remove_behind_bridge(struct pci_dev *dev);
struct pci_driver *pci_dev_driver(const struct pci_dev *dev);
const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
                                         struct pci_dev *dev);
int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
                    int pass);

void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
                  void *userdata);
int pci_cfg_space_size_ext(struct pci_dev *dev);
int pci_cfg_space_size(struct pci_dev *dev);
unsigned char pci_bus_max_busnr(struct pci_bus *bus);

/* kmem_cache style wrapper around pci_alloc_consistent() */

#include <linux/dmapool.h>

#define pci_pool dma_pool
#define pci_pool_create(name, pdev, size, align, allocation) \
                dma_pool_create(name, &pdev->dev, size, align, allocation)
#define pci_pool_destroy(pool) dma_pool_destroy(pool)
#define pci_pool_alloc(pool, flags, handle) dma_pool_alloc(pool, flags, handle)
#define pci_pool_free(pool, vaddr, addr) dma_pool_free(pool, vaddr, addr)

enum pci_dma_burst_strategy {
        PCI_DMA_BURST_INFINITY, /* make bursts as large as possible,
                                   strategy_parameter is N/A */
        PCI_DMA_BURST_BOUNDARY, /* disconnect at every strategy_parameter
                                   byte boundaries */
        PCI_DMA_BURST_MULTIPLE, /* disconnect at some multiple of
                                   strategy_parameter byte boundaries */
};

struct msix_entry {
        u32     vector; /* kernel uses to write allocated vector */
        u16     entry;  /* driver uses to specify entry, OS writes */
};


#ifndef CONFIG_PCI_MSI
static inline int pci_enable_msi_block(struct pci_dev *dev, unsigned int nvec)
{
        return -1;
}

static inline void pci_msi_shutdown(struct pci_dev *dev)
{ }
static inline void pci_disable_msi(struct pci_dev *dev)
{ }

static inline int pci_msix_table_size(struct pci_dev *dev)
{
        return 0;
}
static inline int pci_enable_msix(struct pci_dev *dev,
                                  struct msix_entry *entries, int nvec)
{
        return -1;
}

static inline void pci_msix_shutdown(struct pci_dev *dev)
{ }
static inline void pci_disable_msix(struct pci_dev *dev)
{ }

static inline void msi_remove_pci_irq_vectors(struct pci_dev *dev)
{ }

static inline void pci_restore_msi_state(struct pci_dev *dev)
{ }
static inline int pci_msi_enabled(void)
{
        return 0;
}
#else
extern int pci_enable_msi_block(struct pci_dev *dev, unsigned int nvec);
extern void pci_msi_shutdown(struct pci_dev *dev);
extern void pci_disable_msi(struct pci_dev *dev);
extern int pci_msix_table_size(struct pci_dev *dev);
extern int pci_enable_msix(struct pci_dev *dev,
        struct msix_entry *entries, int nvec);
extern void pci_msix_shutdown(struct pci_dev *dev);
extern void pci_disable_msix(struct pci_dev *dev);
extern void msi_remove_pci_irq_vectors(struct pci_dev *dev);
extern void pci_restore_msi_state(struct pci_dev *dev);
extern int pci_msi_enabled(void);
#endif

#ifndef CONFIG_PCIEASPM
static inline int pcie_aspm_enabled(void)
{
        return 0;
}
#else
extern int pcie_aspm_enabled(void);
#endif

#define pci_enable_msi(pdev)    pci_enable_msi_block(pdev, 1)

#ifdef CONFIG_HT_IRQ
/* The functions a driver should call */
int  ht_create_irq(struct pci_dev *dev, int idx);
void ht_destroy_irq(unsigned int irq);
#endif /* CONFIG_HT_IRQ */

extern void pci_block_user_cfg_access(struct pci_dev *dev);
extern void pci_unblock_user_cfg_access(struct pci_dev *dev);

/*
 * PCI domain support.  Sometimes called PCI segment (eg by ACPI),
 * a PCI domain is defined to be a set of PCI busses which share
 * configuration space.
 */
#ifdef CONFIG_PCI_DOMAINS
extern int pci_domains_supported;
#else
enum { pci_domains_supported = 0 };
static inline int pci_domain_nr(struct pci_bus *bus)
{
        return 0;
}

static inline int pci_proc_domain(struct pci_bus *bus)
{
        return 0;
}
#endif /* CONFIG_PCI_DOMAINS */

#else /* CONFIG_PCI is not enabled */

/*
 *  If the system does not have PCI, clearly these return errors.  Define
 *  these as simple inline functions to avoid hair in drivers.
 */

#define _PCI_NOP(o, s, t) \
        static inline int pci_##o##_config_##s(struct pci_dev *dev, \
                                                int where, t val) \
                { return PCIBIOS_FUNC_NOT_SUPPORTED; }

#define _PCI_NOP_ALL(o, x)      _PCI_NOP(o, byte, u8 x) \
                                _PCI_NOP(o, word, u16 x) \
                                _PCI_NOP(o, dword, u32 x)
_PCI_NOP_ALL(read, *)
_PCI_NOP_ALL(write,)

static inline struct pci_dev *pci_find_device(unsigned int vendor,
                                              unsigned int device,
                                              struct pci_dev *from)
{
        return NULL;
}

static inline struct pci_dev *pci_find_slot(unsigned int bus,
                                            unsigned int devfn)
{
        return NULL;
}

static inline struct pci_dev *pci_get_device(unsigned int vendor,
                                             unsigned int device,
                                             struct pci_dev *from)
{
        return NULL;
}

static inline struct pci_dev *pci_get_subsys(unsigned int vendor,
                                             unsigned int device,
                                             unsigned int ss_vendor,
                                             unsigned int ss_device,
                                             struct pci_dev *from)
{
        return NULL;
}

static inline struct pci_dev *pci_get_class(unsigned int class,
                                            struct pci_dev *from)
{
        return NULL;
}

#define pci_dev_present(ids)    (0)
#define no_pci_devices()        (1)
#define pci_dev_put(dev)        do { } while (0)

static inline void pci_set_master(struct pci_dev *dev)
{ }

static inline int pci_enable_device(struct pci_dev *dev)
{
        return -EIO;
}

static inline void pci_disable_device(struct pci_dev *dev)
{ }

static inline int pci_set_dma_mask(struct pci_dev *dev, u64 mask)
{
        return -EIO;
}

static inline int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
{
        return -EIO;
}

static inline int pci_set_dma_max_seg_size(struct pci_dev *dev,
                                        unsigned int size)
{
        return -EIO;
}

static inline int pci_set_dma_seg_boundary(struct pci_dev *dev,
                                        unsigned long mask)
{

        return -EIO;
}

static inline int pci_assign_resource(struct pci_dev *dev, int i)
{
        return -EBUSY;
}

static inline int __pci_register_driver(struct pci_driver *drv,
                                        struct module *owner)
{
        return 0;
}

static inline int pci_register_driver(struct pci_driver *drv)
{
        return 0;
}

static inline void pci_unregister_driver(struct pci_driver *drv)
{ }

static inline int pci_find_capability(struct pci_dev *dev, int cap)
{
        return 0;
}

static inline int pci_find_next_capability(struct pci_dev *dev, u8 post,
                                           int cap)
{
        return 0;
}

static inline int pci_find_ext_capability(struct pci_dev *dev, int cap)
{
        return 0;
}

/* Power management related routines */
static inline int pci_save_state(struct pci_dev *dev)
{
        return 0;
}

static inline int pci_restore_state(struct pci_dev *dev)
{
        return 0;
}

static inline int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
{
        return 0;
}

static inline pci_power_t pci_choose_state(struct pci_dev *dev,
                                           pm_message_t state)
{
        return PCI_D0;
}

static inline int pci_enable_wake(struct pci_dev *dev, pci_power_t state,
                                  int enable)
{
        return 0;
}

static inline int pci_request_regions(struct pci_dev *dev, const char *res_name)
{
        return -EIO;
}

static inline void pci_release_regions(struct pci_dev *dev)
{ }

#define pci_dma_burst_advice(pdev, strat, strategy_parameter) do { } while (0)

static inline void pci_block_user_cfg_access(struct pci_dev *dev)
{ }

static inline void pci_unblock_user_cfg_access(struct pci_dev *dev)
{ }

static inline struct pci_bus *pci_find_next_bus(const struct pci_bus *from)
{ return NULL; }

static inline struct pci_dev *pci_get_slot(struct pci_bus *bus,
                                                unsigned int devfn)
{ return NULL; }

static inline struct pci_dev *pci_get_bus_and_slot(unsigned int bus,
                                                unsigned int devfn)
{ return NULL; }

#endif /* CONFIG_PCI */

/* Include architecture-dependent settings and functions */

#include <asm/pci.h>

/* 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_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))

/* Similar to the helpers above, these manipulate per-pci_dev
 * driver-specific data.  They are really just a wrapper around
 * the generic device structure functions of these calls.
 */
static inline void *pci_get_drvdata(struct pci_dev *pdev)
{
        return dev_get_drvdata(&pdev->dev);
}

static inline void pci_set_drvdata(struct pci_dev *pdev, void *data)
{
        dev_set_drvdata(&pdev->dev, data);
}

/* If you want to know what to call your pci_dev, ask this function.
 * Again, it's a wrapper around the generic device.
 */
static inline const char *pci_name(struct pci_dev *pdev)
{
        return dev_name(&pdev->dev);
}


/* Some archs don't want to expose struct resource to userland as-is
 * in sysfs and /proc
 */
#ifndef HAVE_ARCH_PCI_RESOURCE_TO_USER
static inline void pci_resource_to_user(const struct pci_dev *dev, int bar,
                const struct resource *rsrc, resource_size_t *start,
                resource_size_t *end)
{
        *start = rsrc->start;
        *end = rsrc->end;
}
#endif /* HAVE_ARCH_PCI_RESOURCE_TO_USER */


/*
 *  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, device;     /* You can use PCI_ANY_ID here of course */
        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_final,        /* Final phase of device fixups */
        pci_fixup_enable,       /* pci_enable_device() time */
        pci_fixup_resume,       /* pci_device_resume() */
        pci_fixup_suspend,      /* pci_device_suspend */
        pci_fixup_resume_early, /* pci_device_resume_early() */
};

/* Anonymous variables would be nice... */
#define DECLARE_PCI_FIXUP_SECTION(section, name, vendor, device, hook)  \
        static const struct pci_fixup __pci_fixup_##name __used         \
        __attribute__((__section__(#section))) = { vendor, device, hook };
#define DECLARE_PCI_FIXUP_EARLY(vendor, device, hook)                   \
        DECLARE_PCI_FIXUP_SECTION(.pci_fixup_early,                     \
                        vendor##device##hook, vendor, device, hook)
#define DECLARE_PCI_FIXUP_HEADER(vendor, device, hook)                  \
        DECLARE_PCI_FIXUP_SECTION(.pci_fixup_header,                    \
                        vendor##device##hook, vendor, device, hook)
#define DECLARE_PCI_FIXUP_FINAL(vendor, device, hook)                   \
        DECLARE_PCI_FIXUP_SECTION(.pci_fixup_final,                     \
                        vendor##device##hook, vendor, device, hook)
#define DECLARE_PCI_FIXUP_ENABLE(vendor, device, hook)                  \
        DECLARE_PCI_FIXUP_SECTION(.pci_fixup_enable,                    \
                        vendor##device##hook, vendor, device, hook)
#define DECLARE_PCI_FIXUP_RESUME(vendor, device, hook)                  \
        DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume,                    \
                        resume##vendor##device##hook, vendor, device, hook)
#define DECLARE_PCI_FIXUP_RESUME_EARLY(vendor, device, hook)            \
        DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume_early,              \
                        resume_early##vendor##device##hook, vendor, device, hook)
#define DECLARE_PCI_FIXUP_SUSPEND(vendor, device, hook)                 \
        DECLARE_PCI_FIXUP_SECTION(.pci_fixup_suspend,                   \
                        suspend##vendor##device##hook, vendor, device, hook)


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

void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen);
void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr);
void __iomem * const *pcim_iomap_table(struct pci_dev *pdev);
int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name);
int pcim_iomap_regions_request_all(struct pci_dev *pdev, u16 mask,
                                   const char *name);
void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask);

extern int pci_pci_problems;
#define PCIPCI_FAIL             1       /* No PCI PCI DMA */
#define PCIPCI_TRITON           2
#define PCIPCI_NATOMA           4
#define PCIPCI_VIAETBF          8
#define PCIPCI_VSFX             16
#define PCIPCI_ALIMAGIK         32      /* Need low latency setting */
#define PCIAGP_FAIL             64      /* No PCI to AGP DMA */

extern unsigned long pci_cardbus_io_size;
extern unsigned long pci_cardbus_mem_size;

int pcibios_add_platform_entries(struct pci_dev *dev);
void pcibios_disable_device(struct pci_dev *dev);
int pcibios_set_pcie_reset_state(struct pci_dev *dev,
                                 enum pcie_reset_state state);

#ifdef CONFIG_PCI_MMCONFIG
extern void __init pci_mmcfg_early_init(void);
extern void __init pci_mmcfg_late_init(void);
#else
static inline void pci_mmcfg_early_init(void) { }
static inline void pci_mmcfg_late_init(void) { }
#endif

int pci_ext_cfg_avail(struct pci_dev *dev);

void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar);

#ifdef CONFIG_PCI_IOV
extern int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
extern void pci_disable_sriov(struct pci_dev *dev);
extern irqreturn_t pci_sriov_migration(struct pci_dev *dev);
#else
static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
{
        return -ENODEV;
}
static inline void pci_disable_sriov(struct pci_dev *dev)
{
}
static inline irqreturn_t pci_sriov_migration(struct pci_dev *dev)
{
        return IRQ_NONE;
}
#endif

#endif /* __KERNEL__ */
#endif /* LINUX_PCI_H */