539 lines
12 KiB
C
539 lines
12 KiB
C
/**************************************************************************
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**
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** $Id: pcibus.c,v 1.34 1997/04/09 09:16:27 se Exp $
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**
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** pci bus subroutines for i386 architecture.
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**
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** FreeBSD
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**
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**-------------------------------------------------------------------------
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**
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** Copyright (c) 1994 Wolfgang Stanglmeier. All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**
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***************************************************************************
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*/
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#include "vector.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <i386/isa/icu.h>
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#include <i386/isa/isa_device.h>
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#include <pci/pcivar.h>
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#include <pci/pcireg.h>
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#include <pci/pcibus.h>
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/*-----------------------------------------------------------------
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**
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** The following functions are provided by the pci bios.
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** They are used only by the pci configuration.
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**
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** pcibus_setup():
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** Probes for a pci system.
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** Sets pci_maxdevice and pci_mechanism.
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**
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** pcibus_tag():
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** Creates a handle for pci configuration space access.
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** This handle is given to the read/write functions.
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**
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** pcibus_ftag():
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** Creates a modified handle.
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**
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** pcibus_read():
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** Read a long word from the pci configuration space.
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** Requires a tag (from pcitag) and the register
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** number (should be a long word aligned one).
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**
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** pcibus_write():
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** Writes a long word to the pci configuration space.
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** Requires a tag (from pcitag), the register number
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** (should be a long word aligned one), and a value.
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**
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** pcibus_regirq():
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** Register an interrupt handler for a pci device.
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** Requires a tag (from pcitag), the register number
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** (should be a long word aligned one), and a value.
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**
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**-----------------------------------------------------------------
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*/
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static int
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pcibus_check (void);
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static void
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pcibus_setup (void);
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static pcici_t
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pcibus_tag (u_char bus, u_char device, u_char func);
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static pcici_t
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pcibus_ftag (pcici_t tag, u_char func);
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static u_long
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pcibus_read (pcici_t tag, u_long reg);
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static void
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pcibus_write (pcici_t tag, u_long reg, u_long data);
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static int
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pcibus_ihandler_attach (int irq, inthand2_t *func, int arg, unsigned* maskptr);
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static int
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pcibus_ihandler_detach (int irq, inthand2_t *func);
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static int
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pcibus_imask_include (int irq, unsigned* maskptr);
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static int
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pcibus_imask_exclude (int irq, unsigned* maskptr);
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static struct pcibus i386pci = {
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"pci",
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pcibus_setup,
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pcibus_tag,
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pcibus_ftag,
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pcibus_read,
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pcibus_write,
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pcibus_ihandler_attach,
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pcibus_ihandler_detach,
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pcibus_imask_include,
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pcibus_imask_exclude,
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};
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/*
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** Announce structure to generic driver
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*/
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DATA_SET (pcibus_set, i386pci);
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/*--------------------------------------------------------------------
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**
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** Determine configuration mode
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**
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**--------------------------------------------------------------------
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*/
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#define CONF1_ADDR_PORT 0x0cf8
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#define CONF1_DATA_PORT 0x0cfc
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#define CONF1_ENABLE 0x80000000ul
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#define CONF1_ENABLE_CHK 0x80000000ul
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#define CONF1_ENABLE_MSK 0x7ff00000ul
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#define CONF1_ENABLE_CHK1 0xff000001ul
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#define CONF1_ENABLE_MSK1 0x80000001ul
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#define CONF1_ENABLE_RES1 0x80000000ul
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#define CONF2_ENABLE_PORT 0x0cf8
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#ifdef PC98
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#define CONF2_FORWARD_PORT 0x0cf9
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#else
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#define CONF2_FORWARD_PORT 0x0cfa
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#endif
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#define CONF2_ENABLE_CHK 0x0e
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#define CONF2_ENABLE_RES 0x0e
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static int
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pcibus_check (void)
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{
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u_char device;
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if (bootverbose) printf ("pcibus_check:\tdevice ");
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for (device = 0; device < pci_maxdevice; device++) {
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unsigned long id, class, header;
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if (bootverbose)
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printf ("%d ", device);
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id = pcibus_read (pcibus_tag (0,device,0), 0);
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if ((id == 0) || (id == 0xfffffffful))
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continue;
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class = pcibus_read (pcibus_tag (0,device,0), 8);
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if (bootverbose)
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printf ("[class=%x] ", class >> 8);
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if ((class & 0xffffff00) == 0 || (class & 0xf8f0ff00) != 0)
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continue;
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header = pcibus_read (pcibus_tag (0,device,0), 12);
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if (bootverbose)
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printf ("[hdr=%x] ", (header >> 16) & 0xff);
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if ((header & 0x007e0000) != 0)
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continue;
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if (bootverbose) printf ("is there (id=%08lx)\n", id);
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return 1;
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}
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if (bootverbose)
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printf ("-- nothing found\n");
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return 0;
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}
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static void
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pcibus_setup (void)
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{
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unsigned long mode1res,oldval1;
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unsigned char mode2res,oldval2;
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oldval1 = inl (CONF1_ADDR_PORT);
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if (bootverbose) {
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printf ("pcibus_setup(1):\tmode 1 addr port (0x0cf8) is 0x%08lx\n", oldval1);
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}
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/*---------------------------------------
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** Assume configuration mechanism 1 for now ...
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**---------------------------------------
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*/
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if ((oldval1 & CONF1_ENABLE_MSK) == 0) {
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pci_mechanism = 1;
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pci_maxdevice = 32;
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outl (CONF1_ADDR_PORT, CONF1_ENABLE_CHK);
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outb (CONF1_ADDR_PORT +3, 0);
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mode1res = inl (CONF1_ADDR_PORT);
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outl (CONF1_ADDR_PORT, oldval1);
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if (bootverbose)
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printf ("pcibus_setup(1a):\tmode1res=0x%08lx (0x%08lx)\n",
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mode1res, CONF1_ENABLE_CHK);
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if (mode1res) {
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if (pcibus_check())
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return;
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};
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outl (CONF1_ADDR_PORT, CONF1_ENABLE_CHK1);
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mode1res = inl(CONF1_ADDR_PORT);
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outl (CONF1_ADDR_PORT, oldval1);
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if (bootverbose)
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printf ("pcibus_setup(1b):\tmode1res=0x%08lx (0x%08lx)\n",
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mode1res, CONF1_ENABLE_CHK1);
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if ((mode1res & CONF1_ENABLE_MSK1) == CONF1_ENABLE_RES1) {
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if (pcibus_check())
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return;
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};
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}
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/*---------------------------------------
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** Try configuration mechanism 2 ...
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**---------------------------------------
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*/
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oldval2 = inb (CONF2_ENABLE_PORT);
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if (bootverbose) {
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printf ("pcibus_setup(2):\tmode 2 enable port (0x0cf8) is 0x%02x\n", oldval2);
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}
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if ((oldval2 & 0xf0) == 0) {
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pci_mechanism = 2;
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pci_maxdevice = 16;
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outb (CONF2_ENABLE_PORT, CONF2_ENABLE_CHK);
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mode2res = inb(CONF2_ENABLE_PORT);
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outb (CONF2_ENABLE_PORT, oldval2);
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if (bootverbose)
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printf ("pcibus_setup(2a):\tmode2res=0x%02x (0x%02x)\n",
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mode2res, CONF2_ENABLE_CHK);
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if (mode2res == CONF2_ENABLE_RES) {
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if (bootverbose)
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printf ("pcibus_setup(2a):\tnow trying mechanism 2\n");
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if (pcibus_check())
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return;
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}
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}
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/*---------------------------------------
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** No PCI bus host bridge found
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**---------------------------------------
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*/
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pci_mechanism = 0;
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pci_maxdevice = 0;
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}
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/*--------------------------------------------------------------------
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**
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** Build a pcitag from bus, device and function number
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**
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**--------------------------------------------------------------------
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*/
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static pcici_t
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pcibus_tag (unsigned char bus, unsigned char device, unsigned char func)
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{
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pcici_t tag;
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tag.cfg1 = 0;
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if (func >= 8) return tag;
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switch (pci_mechanism) {
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case 1:
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if (device < 32) {
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tag.cfg1 = CONF1_ENABLE
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| (((u_long) bus ) << 16ul)
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| (((u_long) device) << 11ul)
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| (((u_long) func ) << 8ul);
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}
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break;
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case 2:
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if (device < 16) {
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tag.cfg2.port = 0xc000 | (device << 8ul);
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tag.cfg2.enable = 0xf0 | (func << 1ul);
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tag.cfg2.forward = bus;
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}
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break;
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};
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return tag;
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}
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static pcici_t
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pcibus_ftag (pcici_t tag, u_char func)
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{
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switch (pci_mechanism) {
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case 1:
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tag.cfg1 &= ~0x700ul;
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tag.cfg1 |= (((u_long) func) << 8ul);
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break;
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case 2:
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tag.cfg2.enable = 0xf0 | (func << 1ul);
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break;
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};
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return tag;
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}
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/*--------------------------------------------------------------------
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**
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** Read register from configuration space.
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**
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**--------------------------------------------------------------------
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*/
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static u_long
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pcibus_read (pcici_t tag, u_long reg)
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{
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u_long addr, data = 0;
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if (!tag.cfg1) return (0xfffffffful);
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switch (pci_mechanism) {
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case 1:
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addr = tag.cfg1 | (reg & 0xfc);
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#ifdef PCI_DEBUG
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printf ("pci_conf_read(1): addr=%x ", addr);
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#endif
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outl (CONF1_ADDR_PORT, addr);
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data = inl (CONF1_DATA_PORT);
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outl (CONF1_ADDR_PORT, 0 );
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break;
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case 2:
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addr = tag.cfg2.port | (reg & 0xfc);
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#ifdef PCI_DEBUG
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printf ("pci_conf_read(2): addr=%x ", addr);
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#endif
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outb (CONF2_ENABLE_PORT , tag.cfg2.enable );
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outb (CONF2_FORWARD_PORT, tag.cfg2.forward);
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data = inl ((u_short) addr);
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outb (CONF2_ENABLE_PORT, 0);
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outb (CONF2_FORWARD_PORT, 0);
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break;
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};
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#ifdef PCI_DEBUG
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printf ("data=%x\n", data);
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#endif
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return (data);
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}
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/*--------------------------------------------------------------------
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**
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** Write register into configuration space.
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**
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**--------------------------------------------------------------------
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*/
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static void
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pcibus_write (pcici_t tag, u_long reg, u_long data)
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{
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u_long addr;
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if (!tag.cfg1) return;
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switch (pci_mechanism) {
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case 1:
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addr = tag.cfg1 | (reg & 0xfc);
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#ifdef PCI_DEBUG
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printf ("pci_conf_write(1): addr=%x data=%x\n",
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addr, data);
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#endif
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outl (CONF1_ADDR_PORT, addr);
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outl (CONF1_DATA_PORT, data);
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outl (CONF1_ADDR_PORT, 0 );
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break;
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case 2:
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addr = tag.cfg2.port | (reg & 0xfc);
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#ifdef PCI_DEBUG
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printf ("pci_conf_write(2): addr=%x data=%x\n",
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addr, data);
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#endif
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outb (CONF2_ENABLE_PORT, tag.cfg2.enable);
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outb (CONF2_FORWARD_PORT, tag.cfg2.forward);
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outl ((u_short) addr, data);
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outb (CONF2_ENABLE_PORT, 0);
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outb (CONF2_FORWARD_PORT, 0);
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break;
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};
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}
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/*-----------------------------------------------------------------------
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**
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** Register an interrupt handler for a pci device.
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**
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**-----------------------------------------------------------------------
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*/
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static int
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pcibus_ihandler_attach (int irq, inthand2_t *func, int arg, unsigned * maskptr)
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{
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char buf[16];
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char *cp;
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int free_id, id, result;
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sprintf(buf, "pci irq%d", irq);
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for (cp = intrnames, free_id = 0, id = 0; id < NR_DEVICES; id++) {
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if (strcmp(cp, buf) == 0)
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break;
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if (free_id <= 0 && strcmp(cp, "pci irqnn") == 0)
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free_id = id;
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while (*cp++ != '\0')
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;
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}
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if (id == NR_DEVICES) {
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id = free_id;
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if (id == 0) {
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/*
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* All pci irq counters are in use, perhaps because
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* config is old so there aren't any. Abuse the
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* clk0 counter.
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*/
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printf (
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"pcibus_ihandler_attach: counting pci irq%d's as clk0 irqs\n",
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irq);
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}
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}
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result = register_intr(
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irq, /* isa irq */
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id, /* device id */
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0, /* flags? */
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func, /* handler */
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maskptr, /* mask pointer */
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arg); /* handler arg */
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if (result) {
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printf ("@@@ pcibus_ihandler_attach: result=%d\n", result);
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return (result);
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};
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update_intr_masks();
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INTREN ((1ul<<irq));
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return (0);
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}
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static int
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pcibus_ihandler_detach (int irq, inthand2_t *func)
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{
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int result;
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INTRDIS ((1ul<<irq));
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result = unregister_intr (irq, func);
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if (result)
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printf ("@@@ pcibus_ihandler_detach: result=%d\n", result);
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update_intr_masks();
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return (result);
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}
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static int
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pcibus_imask_include (int irq, unsigned* maskptr)
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{
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unsigned mask;
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if (!maskptr) return (0);
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mask = 1ul << irq;
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if (*maskptr & mask)
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return (-1);
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INTRMASK (*maskptr, mask);
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update_intr_masks();
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return (0);
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}
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static int
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pcibus_imask_exclude (int irq, unsigned* maskptr)
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{
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unsigned mask;
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if (!maskptr) return (0);
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mask = 1ul << irq;
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if (! (*maskptr & mask))
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return (-1);
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INTRUNMASK (*maskptr, mask);
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update_intr_masks();
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return (0);
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}
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