/*
   This file is based on:
   $XFree86: xc/programs/Xserver/hw/xfree86/etc/scanpci.c,v 3.34.2.17 1998/11/10 11:55:40 dawes Exp $
   Modified for readability by Nick Kurshev
*/
#include <errno.h>
#ifdef __i386__
//#include <sys/perm.h> doesn't exist on libc5 systems
int iopl();
#else
#if !defined(__sparc__) && !defined(__powerpc__) && !defined(__x86_64__)
#include <sys/io.h>
#endif
#endif

#include "config.h"

#ifdef CONFIG_DHAHELPER
#include <fcntl.h>
int dhahelper_initialized = 0;
int dhahelper_fd = 0;
#endif

#ifdef CONFIG_SVGAHELPER
#include <svgalib_helper.h>
#ifdef __linux__
#include <linux/ioctl.h>
#endif
#include <fcntl.h>
#ifndef SVGALIB_HELPER_IOC_MAGIC
/* svgalib 1.9.18+ compatibility ::atmos */
#define SVGALIB_HELPER_IOCGPCIINL SVGAHELPER_PCIINL
#endif
int svgahelper_initialized = 0;
int svgahelper_fd = 0;

static int pci_config_type(void)
{
    return 1;
}

static long pci_config_read_long(
          unsigned char bus,
          unsigned char dev,
          int func, 
          unsigned cmd)
{
    unsigned long config_cmd;
    pcic_t p;
    
    p.address = cmd;
    p.pcipos = (bus << 8) | dev | (func << 5);
    
    if (ioctl(svgahelper_fd, SVGALIB_HELPER_IOCGPCIINL, &p))
	return -1;

    return p.val;
}

static int pci_get_vendor(
          unsigned char bus,
          unsigned char dev,
          int func)
{
    return pci_config_read_long(bus, dev, func, 0);
}
#endif

static __inline__ int enable_os_io(void)
{
#ifdef CONFIG_SVGAHELPER
    svgahelper_fd = open(DEV_SVGA, O_RDWR);
    if (svgahelper_fd > 0)
    {
	svgahelper_initialized = 1;
	return(0);
    }
    svgahelper_initialized = -1;
#endif

#ifdef CONFIG_DHAHELPER
    dhahelper_fd = open("/dev/dhahelper", O_RDWR);
    if (dhahelper_fd > 0)
    {
	dhahelper_initialized = 1;
	return(0);
    }
    dhahelper_initialized = -1;
#endif

#if defined(__powerpc__) && defined(__linux__)
/* should be fixed? */
#else    
    if (iopl(3) != 0)
	return(errno);
#endif    
    return(0);
}

static __inline__ int disable_os_io(void)
{
#ifdef CONFIG_SVGAHELPER
    if (svgahelper_initialized == 1)
	close(svgahelper_fd);
    else
#endif
#ifdef CONFIG_DHAHELPER
    if (dhahelper_initialized == 1)
	close(dhahelper_fd);
    else
#endif
#if defined(__powerpc__) && defined(__linux__)
/* should be fixed? */
#else    
    if (iopl(0) != 0)
	return(errno);
#endif    
    return(0);
}

#if (defined(__powerpc__) || defined(__sparc__) || defined(__sparc64__) \
    || defined(__x86_64__)) && defined(__linux__) && !defined(CONFIG_SVGAHELPER)
#define CONFIG_PCI_LINUX_PROC
#endif

#if defined(CONFIG_PCI_LINUX_PROC)
static int pci_config_type( void ) { return 1; }

/* pci operations for (powerpc) Linux 
   questions, suggestions etc: 
   mplayer-dev-eng@mplayerhq.hu, colin@colino.net*/
#include <fcntl.h>
//#include <sys/io.h>
#include <linux/pci.h>
#include "libavutil/common.h"
#include "libavutil/bswap.h"

static int pci_get_vendor(
          unsigned char bus,
          unsigned char dev,
          int func)
{
    int retval;
    char path[100];
    int fd;
    short vendor, device;
    sprintf(path,"/proc/bus/pci/%02d/%02x.0", bus, dev);
    fd = open(path,O_RDONLY|O_SYNC);
    if (fd == -1) {
	    retval=0xFFFF;
    }
    else if (pread(fd, &vendor, 2, PCI_VENDOR_ID) == 2 &&
             pread(fd, &device, 2, PCI_DEVICE_ID) == 2) {
	    vendor = le2me_16(vendor);
	    device = le2me_16(device);
	    retval = vendor + (device<<16); /*no worries about byte order, 
	    				      all ppc are bigendian*/
    } else {
	    retval = 0xFFFF;
    }   
    if (fd > 0) {
	    close(fd);
    }
    return retval;
}

static long pci_config_read_long(
          unsigned char bus,
          unsigned char dev,
          int func, 
          unsigned cmd)
{
    long retval;
    char path[100];
    int fd;
    sprintf(path,"/proc/bus/pci/%02d/%02x.0", bus, dev);
    fd = open(path,O_RDONLY|O_SYNC);
    if (fd == -1) {
	    retval=0;
    }
    else if (pread(fd, &retval, 4, cmd) == 4) {
	    retval = le2me_32(retval);
    } else {
	    retval = 0;
    }   
    if (fd > 0) {
	    close(fd);
    }
    return retval;
}
#endif