/*
 *      $Id: pci.h,v 1.87 1998/10/11 15:13:12 mj Exp $
 *
 *      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

/*
 * Under PCI, each device has 256 bytes of configuration address space,
 * of which the first 64 bytes are standardized as follows:
 */
#define PCI_VENDOR_ID           0x00    /* 16 bits */
#define PCI_DEVICE_ID           0x02    /* 16 bits */
#define PCI_COMMAND             0x04    /* 16 bits */
#define  PCI_COMMAND_IO         0x1     /* Enable response in I/O space */
#define  PCI_COMMAND_MEMORY     0x2     /* Enable response in Memory space */
#define  PCI_COMMAND_MASTER     0x4     /* Enable bus mastering */
#define  PCI_COMMAND_SPECIAL    0x8     /* Enable response to special cycles */
#define  PCI_COMMAND_INVALIDATE 0x10    /* Use memory write and invalidate */
#define  PCI_COMMAND_VGA_PALETTE 0x20   /* Enable palette snooping */
#define  PCI_COMMAND_PARITY     0x40    /* Enable parity checking */
#define  PCI_COMMAND_WAIT       0x80    /* Enable address/data stepping */
#define  PCI_COMMAND_SERR       0x100   /* Enable SERR */
#define  PCI_COMMAND_FAST_BACK  0x200   /* Enable back-to-back writes */

#define PCI_STATUS              0x06    /* 16 bits */
#define  PCI_STATUS_CAP_LIST    0x10    /* Support Capability List */
#define  PCI_STATUS_66MHZ       0x20    /* Support 66 Mhz PCI 2.1 bus */
#define  PCI_STATUS_UDF         0x40    /* Support User Definable Features [obsolete] */
#define  PCI_STATUS_FAST_BACK   0x80    /* Accept fast-back to back */
#define  PCI_STATUS_PARITY      0x100   /* Detected parity error */
#define  PCI_STATUS_DEVSEL_MASK 0x600   /* DEVSEL timing */
#define  PCI_STATUS_DEVSEL_FAST 0x000   
#define  PCI_STATUS_DEVSEL_MEDIUM 0x200
#define  PCI_STATUS_DEVSEL_SLOW 0x400
#define  PCI_STATUS_SIG_TARGET_ABORT 0x800 /* Set on target abort */
#define  PCI_STATUS_REC_TARGET_ABORT 0x1000 /* Master ack of " */
#define  PCI_STATUS_REC_MASTER_ABORT 0x2000 /* Set on master abort */
#define  PCI_STATUS_SIG_SYSTEM_ERROR 0x4000 /* Set when we drive SERR */
#define  PCI_STATUS_DETECTED_PARITY 0x8000 /* Set on parity error */

#define PCI_CLASS_REVISION      0x08    /* High 24 bits are class, low 8
                                           revision */
#define PCI_REVISION_ID         0x08    /* Revision ID */
#define PCI_CLASS_PROG          0x09    /* Reg. Level Programming Interface */
#define PCI_CLASS_DEVICE        0x0a    /* Device class */

#define PCI_CACHE_LINE_SIZE     0x0c    /* 8 bits */
#define PCI_LATENCY_TIMER       0x0d    /* 8 bits */
#define PCI_HEADER_TYPE         0x0e    /* 8 bits */
#define  PCI_HEADER_TYPE_NORMAL 0
#define  PCI_HEADER_TYPE_BRIDGE 1
#define  PCI_HEADER_TYPE_CARDBUS 2

#define PCI_BIST                0x0f    /* 8 bits */
#define PCI_BIST_CODE_MASK      0x0f    /* Return result */
#define PCI_BIST_START          0x40    /* 1 to start BIST, 2 secs or less */
#define PCI_BIST_CAPABLE        0x80    /* 1 if BIST capable */

/*
 * Base addresses specify locations in memory or I/O space.
 * Decoded size can be determined by writing a value of 
 * 0xffffffff to the register, and reading it back.  Only 
 * 1 bits are decoded.
 */
#define PCI_BASE_ADDRESS_0      0x10    /* 32 bits */
#define PCI_BASE_ADDRESS_1      0x14    /* 32 bits [htype 0,1 only] */
#define PCI_BASE_ADDRESS_2      0x18    /* 32 bits [htype 0 only] */
#define PCI_BASE_ADDRESS_3      0x1c    /* 32 bits */
#define PCI_BASE_ADDRESS_4      0x20    /* 32 bits */
#define PCI_BASE_ADDRESS_5      0x24    /* 32 bits */
#define  PCI_BASE_ADDRESS_SPACE 0x01    /* 0 = memory, 1 = I/O */
#define  PCI_BASE_ADDRESS_SPACE_IO 0x01
#define  PCI_BASE_ADDRESS_SPACE_MEMORY 0x00
#define  PCI_BASE_ADDRESS_MEM_TYPE_MASK 0x06
#define  PCI_BASE_ADDRESS_MEM_TYPE_32   0x00    /* 32 bit address */
#define  PCI_BASE_ADDRESS_MEM_TYPE_1M   0x02    /* Below 1M [obsolete] */
#define  PCI_BASE_ADDRESS_MEM_TYPE_64   0x04    /* 64 bit address */
#define  PCI_BASE_ADDRESS_MEM_PREFETCH  0x08    /* prefetchable? */
#define  PCI_BASE_ADDRESS_MEM_MASK      (~0x0fUL)
#define  PCI_BASE_ADDRESS_IO_MASK       (~0x03UL)
/* bit 1 is reserved if address_space = 1 */

/* Header type 0 (normal devices) */
#define PCI_CARDBUS_CIS         0x28
#define PCI_SUBSYSTEM_VENDOR_ID 0x2c
#define PCI_SUBSYSTEM_ID        0x2e  
#define PCI_ROM_ADDRESS         0x30    /* Bits 31..11 are address, 10..1 reserved */
#define  PCI_ROM_ADDRESS_ENABLE 0x01
#define PCI_ROM_ADDRESS_MASK    (~0x7ffUL)

#define PCI_CAPABILITY_LIST     0x34    /* Offset of first capability list entry */

/* 0x35-0x3b are reserved */
#define PCI_INTERRUPT_LINE      0x3c    /* 8 bits */
#define PCI_INTERRUPT_PIN       0x3d    /* 8 bits */
#define PCI_MIN_GNT             0x3e    /* 8 bits */
#define PCI_MAX_LAT             0x3f    /* 8 bits */

/* Header type 1 (PCI-to-PCI bridges) */
#define PCI_PRIMARY_BUS         0x18    /* Primary bus number */
#define PCI_SECONDARY_BUS       0x19    /* Secondary bus number */
#define PCI_SUBORDINATE_BUS     0x1a    /* Highest bus number behind the bridge */
#define PCI_SEC_LATENCY_TIMER   0x1b    /* Latency timer for secondary interface */
#define PCI_IO_BASE             0x1c    /* I/O range behind the bridge */
#define PCI_IO_LIMIT            0x1d
#define  PCI_IO_RANGE_TYPE_MASK 0x0fUL  /* I/O bridging type */
#define  PCI_IO_RANGE_TYPE_16   0x00
#define  PCI_IO_RANGE_TYPE_32   0x01
#define  PCI_IO_RANGE_MASK      (~0x0fUL)
#define PCI_SEC_STATUS          0x1e    /* Secondary status register, only bit 14 used */
#define PCI_MEMORY_BASE         0x20    /* Memory range behind */
#define PCI_MEMORY_LIMIT        0x22
#define  PCI_MEMORY_RANGE_TYPE_MASK 0x0fUL
#define  PCI_MEMORY_RANGE_MASK  (~0x0fUL)
#define PCI_PREF_MEMORY_BASE    0x24    /* Prefetchable memory range behind */
#define PCI_PREF_MEMORY_LIMIT   0x26
#define  PCI_PREF_RANGE_TYPE_MASK 0x0fUL
#define  PCI_PREF_RANGE_TYPE_32 0x00
#define  PCI_PREF_RANGE_TYPE_64 0x01
#define  PCI_PREF_RANGE_MASK    (~0x0fUL)
#define PCI_PREF_BASE_UPPER32   0x28    /* Upper half of prefetchable memory range */
#define PCI_PREF_LIMIT_UPPER32  0x2c
#define PCI_IO_BASE_UPPER16     0x30    /* Upper half of I/O addresses */
#define PCI_IO_LIMIT_UPPER16    0x32
/* 0x34 same as for htype 0 */
/* 0x35-0x3b is reserved */
#define PCI_ROM_ADDRESS1        0x38    /* Same as PCI_ROM_ADDRESS, but for htype 1 */
/* 0x3c-0x3d are same as for htype 0 */
#define PCI_BRIDGE_CONTROL      0x3e
#define  PCI_BRIDGE_CTL_PARITY  0x01    /* Enable parity detection on secondary interface */
#define  PCI_BRIDGE_CTL_SERR    0x02    /* The same for SERR forwarding */
#define  PCI_BRIDGE_CTL_NO_ISA  0x04    /* Disable bridging of ISA ports */
#define  PCI_BRIDGE_CTL_VGA     0x08    /* Forward VGA addresses */
#define  PCI_BRIDGE_CTL_MASTER_ABORT 0x20  /* Report master aborts */
#define  PCI_BRIDGE_CTL_BUS_RESET 0x40  /* Secondary bus reset */
#define  PCI_BRIDGE_CTL_FAST_BACK 0x80  /* Fast Back2Back enabled on secondary interface */

/* Header type 2 (CardBus bridges) */
#define PCI_CB_CAPABILITY_LIST  0x14
/* 0x15 reserved */
#define PCI_CB_SEC_STATUS       0x16    /* Secondary status */
#define PCI_CB_PRIMARY_BUS      0x18    /* PCI bus number */
#define PCI_CB_CARD_BUS         0x19    /* CardBus bus number */
#define PCI_CB_SUBORDINATE_BUS  0x1a    /* Subordinate bus number */
#define PCI_CB_LATENCY_TIMER    0x1b    /* CardBus latency timer */
#define PCI_CB_MEMORY_BASE_0    0x1c
#define PCI_CB_MEMORY_LIMIT_0   0x20
#define PCI_CB_MEMORY_BASE_1    0x24
#define PCI_CB_MEMORY_LIMIT_1   0x28
#define PCI_CB_IO_BASE_0        0x2c
#define PCI_CB_IO_BASE_0_HI     0x2e
#define PCI_CB_IO_LIMIT_0       0x30
#define PCI_CB_IO_LIMIT_0_HI    0x32
#define PCI_CB_IO_BASE_1        0x34
#define PCI_CB_IO_BASE_1_HI     0x36
#define PCI_CB_IO_LIMIT_1       0x38
#define PCI_CB_IO_LIMIT_1_HI    0x3a
#define  PCI_CB_IO_RANGE_MASK   (~0x03UL)
/* 0x3c-0x3d are same as for htype 0 */
#define PCI_CB_BRIDGE_CONTROL   0x3e
#define  PCI_CB_BRIDGE_CTL_PARITY       0x01    /* Similar to standard bridge control register */
#define  PCI_CB_BRIDGE_CTL_SERR         0x02
#define  PCI_CB_BRIDGE_CTL_ISA          0x04
#define  PCI_CB_BRIDGE_CTL_VGA          0x08
#define  PCI_CB_BRIDGE_CTL_MASTER_ABORT 0x20
#define  PCI_CB_BRIDGE_CTL_CB_RESET     0x40    /* CardBus reset */
#define  PCI_CB_BRIDGE_CTL_16BIT_INT    0x80    /* Enable interrupt for 16-bit cards */
#define  PCI_CB_BRIDGE_CTL_PREFETCH_MEM0 0x100  /* Prefetch enable for both memory regions */
#define  PCI_CB_BRIDGE_CTL_PREFETCH_MEM1 0x200
#define  PCI_CB_BRIDGE_CTL_POST_WRITES  0x400
#define PCI_CB_SUBSYSTEM_VENDOR_ID 0x40
#define PCI_CB_SUBSYSTEM_ID     0x42
#define PCI_CB_LEGACY_MODE_BASE 0x44    /* 16-bit PC Card legacy mode base address (ExCa) */
/* 0x48-0x7f reserved */

/* Capability lists */

#define PCI_CAP_LIST_ID         0       /* Capability ID */
#define  PCI_CAP_ID_PM          0x01    /* Power Management */
#define  PCI_CAP_ID_AGP         0x02    /* Accelerated Graphics Port */
#define  PCI_CAP_ID_VPD         0x03    /* Vital Product Data */
#define  PCI_CAP_ID_SLOTID      0x04    /* Slot Identification */
#define  PCI_CAP_ID_MSI         0x05    /* Message Signalled Interrupts */
#define  PCI_CAP_ID_CHSWP       0x06    /* CompactPCI HotSwap */
#define PCI_CAP_LIST_NEXT       1       /* Next capability in the list */
#define PCI_CAP_FLAGS           2       /* Capability defined flags (16 bits) */
#define PCI_CAP_SIZEOF          4

/* Power Management Registers */

#define PCI_PM_PMC              2       /* PM Capabilities Register */
#define  PCI_PM_CAP_VER_MASK    0x0007  /* Version */
#define  PCI_PM_CAP_PME_CLOCK   0x0008  /* PME clock required */
#define  PCI_PM_CAP_RESERVED    0x0010  /* Reserved field */
#define  PCI_PM_CAP_DSI         0x0020  /* Device specific initialization */
#define  PCI_PM_CAP_AUX_POWER   0x01C0  /* Auxilliary power support mask */
#define  PCI_PM_CAP_D1          0x0200  /* D1 power state support */
#define  PCI_PM_CAP_D2          0x0400  /* D2 power state support */
#define  PCI_PM_CAP_PME         0x0800  /* PME pin supported */
#define  PCI_PM_CAP_PME_MASK    0xF800  /* PME Mask of all supported states */
#define  PCI_PM_CAP_PME_D0      0x0800  /* PME# from D0 */
#define  PCI_PM_CAP_PME_D1      0x1000  /* PME# from D1 */
#define  PCI_PM_CAP_PME_D2      0x2000  /* PME# from D2 */
#define  PCI_PM_CAP_PME_D3      0x4000  /* PME# from D3 (hot) */
#define  PCI_PM_CAP_PME_D3cold  0x8000  /* PME# from D3 (cold) */
#define PCI_PM_CTRL             4       /* PM control and status register */
#define  PCI_PM_CTRL_STATE_MASK 0x0003  /* Current power state (D0 to D3) */
#define  PCI_PM_CTRL_PME_ENABLE 0x0100  /* PME pin enable */
#define  PCI_PM_CTRL_DATA_SEL_MASK      0x1e00  /* Data select (??) */
#define  PCI_PM_CTRL_DATA_SCALE_MASK    0x6000  /* Data scale (??) */
#define  PCI_PM_CTRL_PME_STATUS 0x8000  /* PME pin status */
#define PCI_PM_PPB_EXTENSIONS   6       /* PPB support extensions (??) */
#define  PCI_PM_PPB_B2_B3       0x40    /* Stop clock when in D3hot (??) */
#define  PCI_PM_BPCC_ENABLE     0x80    /* Bus power/clock control enable (??) */
#define PCI_PM_DATA_REGISTER    7       /* (??) */
#define PCI_PM_SIZEOF           8

/* AGP registers */

#define PCI_AGP_VERSION         2       /* BCD version number */
#define PCI_AGP_RFU             3       /* Rest of capability flags */
#define PCI_AGP_STATUS          4       /* Status register */
#define  PCI_AGP_STATUS_RQ_MASK 0xff000000      /* Maximum number of requests - 1 */
#define  PCI_AGP_STATUS_SBA     0x0200  /* Sideband addressing supported */
#define  PCI_AGP_STATUS_64BIT   0x0020  /* 64-bit addressing supported */
#define  PCI_AGP_STATUS_FW      0x0010  /* FW transfers supported */
#define  PCI_AGP_STATUS_RATE4   0x0004  /* 4x transfer rate supported */
#define  PCI_AGP_STATUS_RATE2   0x0002  /* 2x transfer rate supported */
#define  PCI_AGP_STATUS_RATE1   0x0001  /* 1x transfer rate supported */
#define PCI_AGP_COMMAND         8       /* Control register */
#define  PCI_AGP_COMMAND_RQ_MASK 0xff000000  /* Master: Maximum number of requests */
#define  PCI_AGP_COMMAND_SBA    0x0200  /* Sideband addressing enabled */
#define  PCI_AGP_COMMAND_AGP    0x0100  /* Allow processing of AGP transactions */
#define  PCI_AGP_COMMAND_64BIT  0x0020  /* Allow processing of 64-bit addresses */
#define  PCI_AGP_COMMAND_FW     0x0010  /* Force FW transfers */
#define  PCI_AGP_COMMAND_RATE4  0x0004  /* Use 4x rate */
#define  PCI_AGP_COMMAND_RATE2  0x0002  /* Use 2x rate */
#define  PCI_AGP_COMMAND_RATE1  0x0001  /* Use 1x rate */
#define PCI_AGP_SIZEOF          12

/* Slot Identification */

#define PCI_SID_ESR             2       /* Expansion Slot Register */
#define  PCI_SID_ESR_NSLOTS     0x1f    /* Number of expansion slots available */
#define  PCI_SID_ESR_FIC        0x20    /* First In Chassis Flag */
#define PCI_SID_CHASSIS_NR      3       /* Chassis Number */

/* Message Signalled Interrupts registers */

#define PCI_MSI_FLAGS           2       /* Various flags */
#define  PCI_MSI_FLAGS_64BIT    0x80    /* 64-bit addresses allowed */
#define  PCI_MSI_FLAGS_QSIZE    0x70    /* Message queue size configured */
#define  PCI_MSI_FLAGS_QMASK    0x0e    /* Maximum queue size available */
#define  PCI_MSI_FLAGS_ENABLE   0x01    /* MSI feature enabled */
#define PCI_MSI_RFU             3       /* Rest of capability flags */
#define PCI_MSI_ADDRESS_LO      4       /* Lower 32 bits */
#define PCI_MSI_ADDRESS_HI      8       /* Upper 32 bits (if PCI_MSI_FLAGS_64BIT set) */
#define PCI_MSI_DATA_32         8       /* 16 bits of data for 32-bit devices */
#define PCI_MSI_DATA_64         12      /* 16 bits of data for 64-bit devices */

/* Include the ID list */

#include <linux/pci_ids.h>

/*
 * 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/types.h>
#include <linux/config.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/errno.h>

/* 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

#define DEVICE_COUNT_COMPATIBLE 4
#define DEVICE_COUNT_IRQ        2
#define DEVICE_COUNT_DMA        2
#define DEVICE_COUNT_RESOURCE   12

#define PCI_ANY_ID (~0)

#define pci_present pcibios_present


#define pci_for_each_dev_reverse(dev) \
        for(dev = pci_dev_g(pci_devices.prev); dev != pci_dev_g(&pci_devices); dev = pci_dev_g(dev->global_list.prev))

#define pci_for_each_bus(bus) \
for(bus = pci_bus_b(pci_root_buses.next); bus != pci_bus_b(&pci_root_buses); bus = pci_bus_b(bus->node.next))

/*
 * The pci_dev structure is used to describe both PCI and ISAPnP devices.
 */
struct pci_dev {
        struct list_head global_list;   /* node in list of all PCI devices */
        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 */

        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              hdr_type;       /* PCI header type (`multi' flag masked out) */
        u8              rom_base_reg;   /* which config register controls the ROM */

        struct pci_driver *driver;      /* which driver has allocated this device */
        void            *driver_data;   /* data private to the driver */
        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.  */

        u32             current_state;  /* Current operating state. In ACPI-speak,
                                           this is D0-D3, D0 being fully functional,
                                           and D3 being off. */

        /* device is compatible with these IDs */
        unsigned short vendor_compatible[DEVICE_COUNT_COMPATIBLE];
        unsigned short device_compatible[DEVICE_COUNT_COMPATIBLE];

        /*
         * 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 */
        struct resource dma_resource[DEVICE_COUNT_DMA];
        struct resource irq_resource[DEVICE_COUNT_IRQ];

        char            name[80];       /* device name */
        char            slot_name[8];   /* slot name */
        int             active;         /* ISAPnP: device is active */
        int             ro;             /* ISAPnP: read only */
        unsigned short  regs;           /* ISAPnP: supported registers */

        int (*prepare)(struct pci_dev *dev);    /* ISAPnP hooks */
        int (*activate)(struct pci_dev *dev);
        int (*deactivate)(struct pci_dev *dev);
};

#define pci_dev_g(n) list_entry(n, struct pci_dev, global_list)
#define pci_dev_b(n) list_entry(n, struct pci_dev, bus_list)

/*
 *  For PCI devices, the region numbers are assigned this way:
 *
 *      0-5     standard PCI regions
 *      6       expansion ROM
 *      7-10    bridges: address space assigned to buses behind the bridge
 */

#define PCI_ROM_RESOURCE 6
#define PCI_BRIDGE_RESOURCES 7
#define PCI_NUM_RESOURCES 11
  
#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 resource *resource[4];   /* 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  vendor;
        unsigned short  device;
        unsigned int    serial;         /* serial number */
        unsigned char   pnpver;         /* Plug & Play version */
        unsigned char   productver;     /* product version */
        unsigned char   checksum;       /* if zero - checksum passed */
        unsigned char   pad1;
};

#define pci_bus_b(n) list_entry(n, struct pci_bus, node)

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

/*
 * 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_byte)(struct pci_dev *, int where, u8 *val);
        int (*read_word)(struct pci_dev *, int where, u16 *val);
        int (*read_dword)(struct pci_dev *, int where, u32 *val);
        int (*write_byte)(struct pci_dev *, int where, u8 val);
        int (*write_word)(struct pci_dev *, int where, u16 val);
        int (*write_dword)(struct pci_dev *, int where, u32 val);
};

struct pbus_set_ranges_data
{
        int found_vga;
        unsigned long io_start, io_end;
        unsigned long mem_start, mem_end;
};

struct pci_device_id {
        unsigned int vendor, device;            /* Vendor and device ID or PCI_ANY_ID */
        unsigned int subvendor, subdevice;      /* Subsystem ID's or PCI_ANY_ID */
        unsigned int class, class_mask;         /* (class,subclass,prog-if) triplet */
        unsigned long driver_data;              /* Data private to the driver */
};

struct pci_driver {
        struct list_head node;
        char *name;
        const struct pci_device_id *id_table;   /* NULL if wants all devices */
        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  (*save_state) (struct pci_dev *dev, u32 state);    /* Save Device Context */
        int  (*suspend)(struct pci_dev *dev, u32 state);        /* Device suspended */
        int  (*resume) (struct pci_dev *dev);                   /* Device woken up */
        int  (*enable_wake) (struct pci_dev *dev, u32 state, int enable);   /* Enable wake event */
};


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

#define pci_for_each_dev(dev) \
        for(dev = pci_dev_g(pci_devices.next); dev != pci_dev_g(&pci_devices); dev = pci_dev_g(dev->global_list.next))

void pcibios_init(void);
void pcibios_fixup_bus(struct pci_bus *);
int pcibios_enable_device(struct pci_dev *);
char *pcibios_setup (char *str);

/* Used only when drivers/pci/setup.c is used */
void pcibios_align_resource(void *, struct resource *, unsigned long);
void pcibios_update_resource(struct pci_dev *, struct resource *,
                             struct resource *, int);
void pcibios_update_irq(struct pci_dev *, int irq);
void pcibios_fixup_pbus_ranges(struct pci_bus *, struct pbus_set_ranges_data *);

/* Backward compatibility, don't use in new code! */

int pcibios_present(void);
int pcibios_read_config_byte (unsigned char bus, unsigned char dev_fn,
                              unsigned char where, unsigned char *val);
int pcibios_read_config_word (unsigned char bus, unsigned char dev_fn,
                              unsigned char where, unsigned short *val);
int pcibios_read_config_dword (unsigned char bus, unsigned char dev_fn,
                               unsigned char where, unsigned int *val);
int pcibios_write_config_byte (unsigned char bus, unsigned char dev_fn,
                               unsigned char where, unsigned char val);
int pcibios_write_config_word (unsigned char bus, unsigned char dev_fn,
                               unsigned char where, unsigned short val);
int pcibios_write_config_dword (unsigned char bus, unsigned char dev_fn,
                                unsigned char where, unsigned int val);
int pcibios_find_class (unsigned int class_code, unsigned short index, unsigned char *bus, unsigned char *dev_fn);
int pcibios_find_device (unsigned short vendor, unsigned short dev_id,
                         unsigned short index, unsigned char *bus,
                         unsigned char *dev_fn);

/* Generic PCI functions used internally */

void pci_init(void);
int pci_bus_exists(const struct list_head *list, int nr);
struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata);
struct pci_bus *pci_alloc_primary_bus(int bus);
struct pci_dev *pci_scan_slot(struct pci_dev *temp);
int pci_proc_attach_device(struct pci_dev *dev);
int pci_proc_detach_device(struct pci_dev *dev);
int pci_proc_attach_bus(struct pci_bus *bus);
int pci_proc_detach_bus(struct pci_bus *bus);
void pci_name_device(struct pci_dev *dev);
char *pci_class_name(u32 class);
void pci_read_bridge_bases(struct pci_bus *child);
struct resource *pci_find_parent_resource(const struct pci_dev *dev, struct resource *res);
int pci_setup_device(struct pci_dev *dev);
int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge);

/* Generic PCI functions exported to card drivers */

struct pci_dev *pci_find_device (unsigned int vendor, unsigned int device, const struct pci_dev *from);
struct pci_dev *pci_find_subsys (unsigned int vendor, unsigned int device,
                                 unsigned int ss_vendor, unsigned int ss_device,
                                 const struct pci_dev *from);
struct pci_dev *pci_find_class (unsigned int class, const struct pci_dev *from);
struct pci_dev *pci_find_slot (unsigned int bus, unsigned int devfn);
int pci_find_capability (struct pci_dev *dev, int cap);

int pci_read_config_byte(struct pci_dev *dev, int where, u8 *val);
int pci_read_config_word(struct pci_dev *dev, int where, u16 *val);
int pci_read_config_dword(struct pci_dev *dev, int where, u32 *val);
int pci_write_config_byte(struct pci_dev *dev, int where, u8 val);
int pci_write_config_word(struct pci_dev *dev, int where, u16 val);
int pci_write_config_dword(struct pci_dev *dev, int where, u32 val);

int pci_enable_device(struct pci_dev *dev);
void pci_disable_device(struct pci_dev *dev);
void pci_set_master(struct pci_dev *dev);
int pci_set_dma_mask(struct pci_dev *dev, u64 mask);
int pci_dac_set_dma_mask(struct pci_dev *dev, u64 mask);
int pci_assign_resource(struct pci_dev *dev, int i);

/* Power management related routines */
int pci_save_state(struct pci_dev *dev, u32 *buffer);
int pci_restore_state(struct pci_dev *dev, u32 *buffer);
int pci_set_power_state(struct pci_dev *dev, int state);
int pci_enable_wake(struct pci_dev *dev, u32 state, int enable);

/* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */

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 *, u32);
unsigned long pci_bridge_check_io(struct pci_dev *);
void pci_fixup_irqs(u8 (*)(struct pci_dev *, u8 *),
                    int (*)(struct pci_dev *, u8, u8));
#define HAVE_PCI_REQ_REGIONS
int pci_request_regions(struct pci_dev *, char *);
void pci_release_regions(struct pci_dev *);

/* New-style probing supporting hot-pluggable devices */
int pci_register_driver(struct pci_driver *);
void pci_unregister_driver(struct pci_driver *);
void pci_insert_device(struct pci_dev *, struct pci_bus *);
void pci_remove_device(struct pci_dev *);
struct pci_driver *pci_dev_driver(const struct pci_dev *);
const struct pci_device_id *pci_match_device(const struct pci_device_id *ids, const struct pci_dev *dev);
void pci_announce_device_to_drivers(struct pci_dev *);
unsigned int pci_do_scan_bus(struct pci_bus *bus);
struct pci_bus * pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr);

/* kmem_cache style wrapper around pci_alloc_consistent() */
struct pci_pool *pci_pool_create (const char *name, struct pci_dev *dev,
                size_t size, size_t align, size_t allocation, int flags);
void pci_pool_destroy (struct pci_pool *pool);

void *pci_pool_alloc (struct pci_pool *pool, int flags, dma_addr_t *handle);
void pci_pool_free (struct pci_pool *pool, void *vaddr, dma_addr_t addr);

#endif /* CONFIG_PCI */

/* Include architecture-dependent settings and functions */

#include <asm/pci.h>

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

#ifndef CONFIG_PCI
static inline int pcibios_present(void) { return 0; }
static inline int pcibios_find_class (unsigned int class_code, unsigned short index, unsigned char *bus, unsigned char *dev_fn) 
{       return PCIBIOS_DEVICE_NOT_FOUND; }

#define _PCI_NOP(o,s,t) \
        static inline int pcibios_##o##_config_##s (u8 bus, u8 dfn, u8 where, t val) \
                { return PCIBIOS_FUNC_NOT_SUPPORTED; } \
        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, const struct pci_dev *from)
{ return NULL; }

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

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_module_init(struct pci_driver *drv) { return -ENODEV; }
static inline int pci_set_dma_mask(struct pci_dev *dev, u64 mask) { return -EIO; }
static inline int pci_dac_set_dma_mask(struct pci_dev *dev, u64 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) { return 0;}
static inline void pci_unregister_driver(struct pci_driver *drv) { }
static inline int scsi_to_pci_dma_dir(unsigned char scsi_dir) { return scsi_dir; }
static inline int pci_find_capability (struct pci_dev *dev, int cap) {return 0; }
static inline const struct pci_device_id *pci_match_device(const struct pci_device_id *ids, const struct pci_dev *dev) { return NULL; }

/* Power management related routines */
static inline int pci_save_state(struct pci_dev *dev, u32 *buffer) { return 0; }
static inline int pci_restore_state(struct pci_dev *dev, u32 *buffer) { return 0; }
static inline int pci_set_power_state(struct pci_dev *dev, int state) { return 0; }
static inline int pci_enable_wake(struct pci_dev *dev, u32 state, int enable) { return 0; }

#define pci_for_each_dev(dev) \
        for(dev = NULL; 0; )

#else

/*
 * a helper function which helps ensure correct pci_driver
 * setup and cleanup for commonly-encountered hotplug/modular cases
 *
 * This MUST stay in a header, as it checks for -DMODULE
 */
static inline int pci_module_init(struct pci_driver *drv)
{
        int rc = pci_register_driver (drv);

        if (rc > 0)
                return 0;

        /* iff CONFIG_HOTPLUG and built into kernel, we should
         * leave the driver around for future hotplug events.
         * For the module case, a hotplug daemon of some sort
         * should load a module in response to an insert event. */
#if defined(CONFIG_HOTPLUG) && !defined(MODULE)
        if (rc == 0)
                return 0;
#else
        if (rc == 0)
                rc = -ENODEV;           
#endif

        /* if we get here, we need to clean up pci driver instance
         * and return some sort of error */
        pci_unregister_driver (drv);
        
        return rc;
}

#endif /* !CONFIG_PCI */

/* 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.  Currently stored as pci_dev::driver_data,
 * a void pointer, but it is not present on older kernels.
 */
static inline void *pci_get_drvdata (struct pci_dev *pdev)
{
        return pdev->driver_data;
}

static inline void pci_set_drvdata (struct pci_dev *pdev, void *data)
{
        pdev->driver_data = data;
}

/*
 *  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 {
        int pass;
        u16 vendor, device;                     /* You can use PCI_ANY_ID here of course */
        void (*hook)(struct pci_dev *dev);
};

extern struct pci_fixup pcibios_fixups[];

#define PCI_FIXUP_HEADER        1               /* Called immediately after reading configuration header */
#define PCI_FIXUP_FINAL         2               /* Final phase of device fixups */

void pci_fixup_device(int pass, struct pci_dev *dev);

extern int pci_pci_problems;
#define PCIPCI_FAIL             1
#define PCIPCI_TRITON           2
#define PCIPCI_NATOMA           4
#define PCIPCI_VIAETBF          8
#define PCIPCI_VSFX             16

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