#ifndef PCI_PCI_H_
#define PCI_PCI_H_

#include <stdint.h>
#include <stddef.h>

typedef union {
  uint32_t bits;
  struct {
    uint32_t alwayszero: 2;
    uint32_t fieldnum: 6;
    uint32_t fnnum: 3;
    uint32_t devnum: 5;
    uint32_t busnum: 8;
    uint32_t resv: 7;
    uint32_t enable: 1;
  };
} PciDev;

#define PCI_CFG_ADDR  0xCF8
#define PCI_CFG_DATA  0xCFC

#define PCI_VENDORID    0x00
#define PCI_DEVICEID    0x02
#define PCI_CMD         0x04
#define PCI_STATUS      0x06
#define PCI_REVID       0x08
#define PCI_PROGIF      0x09
#define PCI_SUBCLASS    0x0A
#define PCI_CLASS       0x0B
#define PCI_CACHELINESZ 0x0C
#define PCI_LTNCY_TIMER 0x0D
#define PCI_HDRTYPE     0x0E
#define PCI_BIST        0x0F
#define PCI_BAR0        0x10
#define PCI_BAR1        0x14
#define PCI_BAR2        0x18
#define PCI_BAR3        0x1C
#define PCI_BAR4        0x20
#define PCI_BAR5        0x24
#define PCI_INTRLINE    0x3C
#define PCI_SCNDRY_BUS  0x09

#define PCI_HDR_DEV     0
#define PCI_HDR_BRIDGE  1
#define PCI_HDR_CARDBUS 2

#define PCI_DEV_PER_BUS   32
#define PCI_FN_PER_DEV    32

uint32_t pci_read(PciDev dev, uint32_t field);
void pci_write(PciDev dev, uint32_t field, uint32_t v);
uint32_t pci_devtype(PciDev dev);
uint32_t pci_scndrybus(PciDev dev);
uint32_t pci_isend(PciDev dev);
PciDev pci_scanfn(uint16_t vendorid, uint16_t deviceid, uint32_t bus,
                  uint32_t device, uint32_t fn, int devtype);
PciDev pci_scanbus(uint16_t vendorid, uint16_t deviceid,
                   uint32_t bus, int devtype);
PciDev pci_scandev(uint16_t vendorid, uint16_t deviceid,
                  uint32_t bus, uint32_t device, int devtype);
PciDev pci_getdev(uint16_t vendorid, uint16_t deviceid, int devtype);

void pci_init(void);

#define PCI_INIT_ARRAY_MAX 0x100

typedef void (*PciInitFn)(void);
extern PciInitFn PCI_INIT_ARRAY[PCI_INIT_ARRAY_MAX];

#endif // PCI_PCI_H_