445 lines
10 KiB
C
445 lines
10 KiB
C
/**************************************************************************
|
||
**
|
||
** $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);
|
||
}
|