minix/sys/arch/i386/stand/lib/test/pci_user.c
2012-02-09 18:48:13 +01:00

101 lines
2.6 KiB
C

/* $NetBSD: pci_user.c,v 1.4 2008/12/14 18:46:33 christos Exp $ */
/*
* Copyright (c) 1998
* Matthias Drochner. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "sanamespace.h"
#include <sys/types.h>
#include <machine/pio.h>
#include <pcivar.h>
extern int mapio(void);
/*
* Replacement for i386/stand/lib/biospci.c.
* Very simple functions to access PCI config space from
* userland. Works with configuration mode 1 only, can
* only access bus number 0.
*/
#define PCI_MODE1_ENABLE 0x80000000UL
#define PCI_MODE1_ADDRESS_REG 0x0cf8
#define PCI_MODE1_DATA_REG 0x0cfc
static int
maketag(int bus, int dev, int fcn)
{
return PCI_MODE1_ENABLE |
(bus << 16) | (dev << 11) | (fcn << 8);
}
int
pcicheck(void)
{
return mapio() ? -1 : 0;
}
int
pcifinddev(int vid, int did, pcihdl_t *handle)
{
int i;
for (i = 0; i < 32; i++) {
pcihdl_t h;
int id;
h = maketag(0, i, 0);
pcicfgread(&h, 0, &id);
if (id == (vid | (did << 16))) {
*handle = h;
return 0;
}
}
return -1;
}
int
pcicfgread(pcihdl_t *handle, int off, int *val)
{
int data;
outl(PCI_MODE1_ADDRESS_REG, *handle | off);
data = inl(PCI_MODE1_DATA_REG);
outl(PCI_MODE1_ADDRESS_REG, 0);
*val = data;
return 0;
}
int
pcicfgwrite(pcihdl_t *handle, int off, int val)
{
outl(PCI_MODE1_ADDRESS_REG, *handle | off);
outl(PCI_MODE1_DATA_REG, val);
outl(PCI_MODE1_ADDRESS_REG, 0);
return 0;
}