freebsd-skq/sys/i386/isa/pcibus.c
Stefan Eßer 781d9d4623 Keep PCI_CONF_MODE in a safe place for later reference, if #defined.
Reviewed by:	se
Submitted by:	seb@erix.ericsson.se (Sebastian Strollo)
1995-02-25 17:51:18 +00:00

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/**************************************************************************
**
** $Id: pcibus.c,v 1.2 1995/02/09 20:16:19 se Exp $
**
** pci bus subroutines for i386 architecture.
**
** 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.
**
***************************************************************************
*/
#ifndef __FreeBSD2__
#if __FreeBSD__ >= 2
#define __FreeBSD2__
#endif
#endif
#ifdef __FreeBSD2__
#define HAS_CPUFUNC_H
#endif
#include <types.h>
#include <param.h>
#include <kernel.h>
#include <i386/isa/isa.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/icu.h>
#ifdef HAS_CPUFUNC_H
#include <i386/include/cpufunc.h>
#endif
#include <pci/pcivar.h>
#include <pci/pcireg.h>
#include <pci/pcibus.h>
extern int printf();
static char pci_mode;
/*-----------------------------------------------------------------
**
** The following functions are provided by the pci bios.
** They are used only by the pci configuration.
**
** pcibus_mode():
** Probes for a pci system.
** Returns 1 or 2 for pci configuration mechanism.
** Returns 0 if no pci system.
**
** pcibus_tag():
** Gets a handle for accessing the pci configuration
** space.
** This handle is given to the mapping functions (see
** above) or to the read/write functions.
**
** pcibus_read():
** Read a long word from the pci configuration space.
** Requires a tag (from pcitag) and the register
** number (should be a long word alligned one).
**
** pcibus_write():
** Writes a long word to the pci configuration space.
** Requires a tag (from pcitag), the register number
** (should be a long word alligned one), and a value.
**
** pcibus_regirq():
** Register an interupt handler for a pci device.
** Requires a tag (from pcitag), the register number
** (should be a long word alligned one), and a value.
**
**-----------------------------------------------------------------
*/
static int
pcibus_mode (void);
static pcici_t
pcibus_tag (u_char bus, u_char device, u_char func);
static u_long
pcibus_read (pcici_t tag, u_long reg);
static void
pcibus_write (pcici_t tag, u_long reg, u_long data);
static int
pcibus_regint (pcici_t tag, int(*func)(), void* arg, unsigned* maskptr);
struct pcibus i386pci = {
"pci",
pcibus_mode,
pcibus_tag,
pcibus_read,
pcibus_write,
pcibus_regint,
};
/*
** Announce structure to generic driver
*/
DATA_SET (pcibus_set, i386pci);
/*--------------------------------------------------------------------
**
** 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
static int
pcibus_mode (void)
{
#ifdef PCI_CONF_MODE
pci_mode = 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
**
**--------------------------------------------------------------------
*/
static pcici_t
pcibus_tag (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.
**
**--------------------------------------------------------------------
*/
static u_long
pcibus_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.
**
**--------------------------------------------------------------------
*/
static void
pcibus_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;
};
}
/*-----------------------------------------------------------------------
**
** Register an interupt handler for a pci device.
**
**-----------------------------------------------------------------------
*/
#ifndef __FreeBSD2__
/*
* Type of the first (asm) part of an interrupt handler.
*/
typedef void inthand_t __P((u_int cs, u_int ef, u_int esp, u_int ss));
/*
* Usual type of the second (C) part of an interrupt handler. Some bogus
* ones need the arg to be the interrupt frame (and not a copy of it, which
* is all that is possible in C).
*/
typedef void inthand2_t __P((int unit));
/*
** XXX @FreeBSD2@
**
** Unfortunately, the mptr argument is _no_ pointer in 2.0 FreeBSD.
** We would prefer a pointer because it enables us to install
** new interrupt handlers at any time.
** (This is just going to be changed ... <se> :)
** In 2.0 FreeBSD later installed interrupt handlers may change
** the xyz_imask, but this would not be recognized by handlers
** which are installed before.
*/
static int
register_intr __P((int intr, int device_id, unsigned int flags,
inthand2_t *handler, unsigned int * mptr, int unit));
extern unsigned intr_mask[ICU_LEN];
#endif /* !__FreeBSD2__ */
static unsigned int pci_int_mask [16];
int pcibus_regint (pcici_t tag, int(*func)(), void* arg, unsigned* maskptr)
{
int irq;
unsigned mask, oldmask;
irq = PCI_INTERRUPT_LINE_EXTRACT(
pci_conf_read (tag, PCI_INTERRUPT_REG));
mask = 1ul << irq;
if (!maskptr)
maskptr = &pci_int_mask[irq];
oldmask = *maskptr;
INTRMASK (*maskptr, mask);
register_intr(
irq, /* isa irq */
0, /* deviced?? */
0, /* flags? */
(inthand2_t*) func, /* handler */
maskptr, /* mask pointer */
(int) arg); /* handler arg */
#ifdef __FreeBSD2__
/*
** XXX See comment at beginning of file.
**
** Have to update all the interrupt masks ... Grrrrr!!!
*/
{
unsigned * mp = &intr_mask[0];
/*
** update the isa interrupt masks.
*/
for (mp=&intr_mask[0]; mp<&intr_mask[ICU_LEN]; mp++)
if ((~*mp & oldmask)==0)
*mp |= mask;
/*
** update the pci interrupt masks.
*/
for (mp=&pci_int_mask[0]; mp<&pci_int_mask[16]; mp++)
if ((~*mp & oldmask)==0)
*mp |= mask;
};
#endif
INTREN (mask);
return (1);
}