pci.h

/*
 *  PCI defines and function prototypes
 *  Copyright 1994, Drew Eckhardt
 *  Copyright 1997, 1998 Martin Mares <mj@atrey.karlin.mff.cuni.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 BOOTLOADER_PCI_H
#define BOOTLOADER_PCI_H

#include <rtems/pci.h>


/* Functions used to access pci configuration space */
struct pci_bootloader_config_access_functions {
        int (*read_config_byte)(unsigned char, unsigned char,
                               unsigned char, uint8_t *);
        int (*read_config_word)(unsigned char, unsigned char,
                               unsigned char, uint16_t *);
        int (*read_config_dword)(unsigned char, unsigned char,
                               unsigned char, uint32_t *);
        int (*write_config_byte)(unsigned char, unsigned char,
                               unsigned char, uint8_t);
        int (*write_config_word)(unsigned char, unsigned char,
                               unsigned char, uint16_t);
        int (*write_config_dword)(unsigned char, unsigned char,
                               unsigned char, uint32_t);
};

/*
 * There is one pci_dev structure for each slot-number/function-number
 * combination:
 */
struct pci_dev {
    struct pci_bus  *bus;       /* bus this device is on */
    struct pci_dev  *sibling;   /* next device on this bus */
    struct pci_dev  *next;      /* chain of all devices */

    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 int    class;      /* 3 bytes: (base,sub,prog-if) */
    unsigned int    hdr_type;   /* PCI header type */
    unsigned int    master : 1; /* set if device is master capable */
    /*
     * In theory, the irq level can be read from configuration
     * space and all would be fine.  However, old PCI chips don't
     * support these registers and return 0 instead.  For example,
     * the Vision864-P rev 0 chip can uses INTA, but returns 0 in
     * the interrupt line and pin registers.  pci_init()
     * initializes this field with the value at PCI_INTERRUPT_LINE
     * and it is the job of pcibios_fixup() to change it if
     * necessary.  The field must not be 0 unless the device
     * cannot generate interrupts at all.
     */
    unsigned int    irq;        /* irq generated by this device */

    /* Base registers for this device, can be adjusted by
     * pcibios_fixup() as necessary.
     */
    unsigned long   base_address[6];
    unsigned long   rom_address;
};

struct pci_bus {
    struct pci_bus  *parent;    /* parent bus this bridge is on */
    struct pci_bus  *children;  /* chain of P2P bridges on this bus */
    struct pci_bus  *next;      /* chain of all PCI buses */

    struct pci_dev  *self;      /* bridge device as seen by parent */
    struct pci_dev  *devices;   /* devices behind this bridge */

    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 */
};

extern struct pci_bus   pci_root;   /* root bus */
extern struct pci_dev   *pci_devices;   /* list of all devices */

#endif /* BOOTLOADER_PCI_H */