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freebsd/sys/i386/pci/pcibios.c
Stefan Eßer 65772aee92 Submitted by: Wolfgang Stanglmeier <wolf@dentaro.GUN.de>
Bug fixed, that caused system hang on first interrupt on some motherboards.

New version of PCI bus configuration code, now supports dynamic interrupt
configuration (using BIOS supplied values).
NCR SCSI and DEC Ethernet driver patched to use this feature.
*** Remove PCI IRQ specifications from your kernel config file ! ***
1994-10-12 02:33:23 +00:00

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/**************************************************************************
**
** $Id: pcibios.c,v 2.6 94/10/11 19:01:25 wolf Oct11 $
**
** #define for pci-bus bios functions.
**
** 386bsd / FreeBSD
**
**-------------------------------------------------------------------------
**
** Copyright (c) 1994 Wolfgang Stanglmeier. 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.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** 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 <pci.h>
#if NPCI > 0
#if __FreeBSD__ >= 2
#define HAS_CPUFUNC_H
#endif
#include <types.h>
#include <i386/isa/isa.h>
#include <i386/pci/pcireg.h>
#ifdef HAS_CPUFUNC_H
#include <i386/include/cpufunc.h>
#endif
extern int printf();
static char pci_mode;
/*--------------------------------------------------------------------
**
** Port access
**
**--------------------------------------------------------------------
*/
#ifndef HAS_CPUFUNC_H
#undef inl
#define inl(port) \
({ u_long data; \
__asm __volatile("inl %1, %0": "=a" (data): "d" ((u_short)(port))); \
data; })
#undef outl
#define outl(port, data) \
{__asm __volatile("outl %0, %1"::"a" ((u_long)(data)), "d" ((u_short)(port)));}
#undef inb
#define inb(port) \
({ u_char data; \
__asm __volatile("inb %1, %0": "=a" (data): "d" ((u_short)(port))); \
data; })
#undef outb
#define outb(port, data) \
{__asm __volatile("outb %0, %1"::"a" ((u_char)(data)), "d" ((u_short)(port)));}
#endif /* HAS_CPUFUNC_H */
/*--------------------------------------------------------------------
**
** Determine configuration mode
**
**--------------------------------------------------------------------
*/
#define CONF1_ENABLE 0x80000000ul
#define CONF1_ADDR_PORT 0x0cf8
#define CONF1_DATA_PORT 0x0cfc
#define CONF2_ENABLE_PORT 0x0cf8
#define CONF2_FORWARD_PORT 0x0cfa
int pci_conf_mode (void)
{
#ifdef PCI_CONF_MODE
return (PCI_CONF_MODE)
#else /* PCI_CONF_MODE */
u_long result, oldval;
/*---------------------------------------
** Configuration mode 2 ?
**---------------------------------------
*/
outb (CONF2_ENABLE_PORT, 0);
outb (CONF2_FORWARD_PORT, 0);
if (!inb (CONF2_ENABLE_PORT) && !inb (CONF2_FORWARD_PORT)) {
pci_mode = 2;
return (2);
};
/*---------------------------------------
** Configuration mode 1 ?
**---------------------------------------
*/
oldval = inl (CONF1_ADDR_PORT);
outl (CONF1_ADDR_PORT, CONF1_ENABLE);
result = inl (CONF1_ADDR_PORT);
outl (CONF1_ADDR_PORT, oldval);
if (result == CONF1_ENABLE) {
pci_mode = 1;
return (1);
};
/*---------------------------------------
** No PCI bus available.
**---------------------------------------
*/
return (0);
#endif /* PCI_CONF_MODE */
}
/*--------------------------------------------------------------------
**
** Build a pcitag from bus, device and function number
**
**--------------------------------------------------------------------
*/
pcici_t pcitag (unsigned char bus,
unsigned char device,
unsigned char func)
{
pcici_t tag;
tag.cfg1 = 0;
if (device >= 32) return tag;
if (func >= 8) return tag;
switch (pci_mode) {
case 1:
tag.cfg1 = CONF1_ENABLE
| (((u_long) bus ) << 16ul)
| (((u_long) device) << 11ul)
| (((u_long) func ) << 8ul);
break;
case 2:
if (device >= 16) break;
tag.cfg2.port = 0xc000 | (device << 8ul);
tag.cfg2.enable = 0xf1 | (func << 1ul);
tag.cfg2.forward = bus;
break;
};
return tag;
}
/*--------------------------------------------------------------------
**
** Read register from configuration space.
**
**--------------------------------------------------------------------
*/
u_long pci_conf_read (pcici_t tag, u_long reg)
{
u_long addr, data = 0;
if (!tag.cfg1) return (0xfffffffful);
switch (pci_mode) {
case 1:
addr = tag.cfg1 | (reg & 0xfc);
#ifdef PCI_DEBUG
printf ("pci_conf_read(1): addr=%x ", addr);
#endif
outl (CONF1_ADDR_PORT, addr);
data = inl (CONF1_DATA_PORT);
outl (CONF1_ADDR_PORT, 0 );
break;
case 2:
addr = tag.cfg2.port | (reg & 0xfc);
#ifdef PCI_DEBUG
printf ("pci_conf_read(2): addr=%x ", addr);
#endif
outb (CONF2_ENABLE_PORT , tag.cfg2.enable );
outb (CONF2_FORWARD_PORT, tag.cfg2.forward);
data = inl ((u_short) addr);
outb (CONF2_ENABLE_PORT, 0);
outb (CONF2_FORWARD_PORT, 0);
break;
};
#ifdef PCI_DEBUG
printf ("data=%x\n", data);
#endif
return (data);
}
/*--------------------------------------------------------------------
**
** Write register into configuration space.
**
**--------------------------------------------------------------------
*/
void pci_conf_write (pcici_t tag, u_long reg, u_long data)
{
u_long addr;
if (!tag.cfg1) return;
switch (pci_mode) {
case 1:
addr = tag.cfg1 | (reg & 0xfc);
#ifdef PCI_DEBUG
printf ("pci_conf_write(1): addr=%x data=%x\n",
addr, data);
#endif
outl (CONF1_ADDR_PORT, addr);
outl (CONF1_DATA_PORT, data);
outl (CONF1_ADDR_PORT, 0 );
break;
case 2:
addr = tag.cfg2.port | (reg & 0xfc);
#ifdef PCI_DEBUG
printf ("pci_conf_write(2): addr=%x data=%x\n",
addr, data);
#endif
outb (CONF2_ENABLE_PORT, tag.cfg2.enable);
outb (CONF2_FORWARD_PORT, tag.cfg2.forward);
outl ((u_short) addr, data);
outb (CONF2_ENABLE_PORT, 0);
outb (CONF2_FORWARD_PORT, 0);
break;
};
}
#endif /* NPCI > 0 */