source: rtems/bsps/powerpc/motorola_powerpc/bootloader/pci.h @ 03e1d837

/*
 *      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 */