622 lines
13 KiB
C
622 lines
13 KiB
C
/**************************************************************************
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**
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** $Id: pci.c,v 1.5 1994/09/28 16:34:07 se Exp $
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**
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** General subroutines for the PCI bus on 80*86 systems.
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** pci_configure ()
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**
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** 386bsd / 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 <pci.h>
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#if NPCI > 0
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/*========================================================
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**
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** Configuration
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**
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**========================================================
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*/
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/*
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** maximum number of devices which share one interrupt line
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*/
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#ifndef PCI_MAX_DPI
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#define PCI_MAX_DPI (4)
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#endif /*PCI_MAX_DPI*/
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/*========================================================
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**
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** #includes and declarations
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**
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**========================================================
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <i386/isa/icu.h>
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#include <i386/isa/isa.h>
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#include <i386/isa/isa_device.h>
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#include <i386/pci/pci.h>
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#include <i386/pci/pci_device.h>
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#include <i386/pci/pcibios.h>
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/*
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** Function prototypes missing in system headers
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*/
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#if ! (__FreeBSD__ >= 2)
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extern pmap_t pmap_kernel(void);
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static vm_offset_t pmap_mapdev (vm_offset_t paddr, vm_size_t vsize);
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#endif
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/*========================================================
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**
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** Autoconfiguration (of isa bus)
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**
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**========================================================
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*/
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/*
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** per slot data structure for passing interupts..
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*/
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static struct {
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u_short number;
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u_short isanum;
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struct {
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int (*proc)(int dev);
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dev_t unit;
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} vector[PCI_MAX_DPI];
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} pcidata [NPCI];
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/*
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** check device ready
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*/
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static int pciprobe (struct isa_device *dev)
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{
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if (dev->id_unit >= NPCI)
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return (0);
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if (!pci_conf_mode())
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return (0);
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return (-1);
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}
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/*
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** initialize the driver structure
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*/
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static int pciattach (struct isa_device *isdp)
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{
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pcidata[isdp->id_unit].number = 0;
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pcidata[isdp->id_unit].isanum = ffs(isdp->id_irq)-1;
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return (1);
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}
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/*
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** ISA driver structure
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*/
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struct isa_driver pcidriver = {
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pciprobe,
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pciattach,
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"pci"
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};
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/*========================================================
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**
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** Interrupt forward from isa to pci devices.
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**
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**========================================================
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*/
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void pciintr (int unit)
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{
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u_short i;
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if (unit >= NPCI) return;
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for (i=0; i<pcidata[unit].number; i++) {
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(void)(*pcidata[unit].vector[i].proc)
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(pcidata[unit].vector[i].unit);
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};
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}
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/*========================================================
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**
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** Autoconfiguration of pci devices.
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**
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** This is reverse to the isa configuration.
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** (1) find a pci device.
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** (2) look for a driver.
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**
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**========================================================
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*/
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/*--------------------------------------------------------
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**
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** The pci devices can be mapped to any address.
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** As default we start at the last gigabyte.
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**
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**--------------------------------------------------------
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*/
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#ifndef PCI_PMEM_START
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#define PCI_PMEM_START 0xc0000000
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#endif
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static vm_offset_t pci_paddr = PCI_PMEM_START;
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/*---------------------------------------------------------
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**
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** pci_configure ()
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**
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**---------------------------------------------------------
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*/
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static void not_supported (pcici_t tag, u_long type);
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void pci_configure()
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{
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u_char device,last_device;
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u_short bus,last_bus;
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pcici_t tag;
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pcidi_t type;
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u_long data;
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int unit;
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int intpin;
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int isanum;
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int pci_mode;
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struct pci_driver *drp;
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struct pci_device *dvp;
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/*
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** check pci bus present
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*/
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pci_mode = pci_conf_mode ();
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if (!pci_mode) return;
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last_bus = pci_last_bus ();
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last_device = pci_mode==1 ? 31 : 15;
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/*
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** hello world ..
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*/
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#ifndef PCI_QUIET
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printf ("pci*: mode=%d, scanning bus 0..%d, device 0..%d.\n",
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pci_mode, last_bus, last_device);
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#endif
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for (bus=0;bus<=last_bus; bus++)
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for (device=0; device<=last_device; device ++) {
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tag = pcitag (bus, device, 0);
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type = pci_conf_read (tag, PCI_ID_REG);
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if ((!type) || (type==0xfffffffful)) continue;
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/*
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** lookup device in ioconfiguration:
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*/
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for (dvp = pci_devtab; dvp->pd_device_id; dvp++) {
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if (dvp->pd_device_id == type) break;
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};
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drp = dvp->pd_driver;
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if (!dvp->pd_device_id) {
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/*
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** not found
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** try to dig out some information.
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**
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** By Garrett Wollman
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** <wollman@halloran-eldar.lcs.mit.edu>
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*/
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int data = pci_conf_read(tag, PCI_CLASS_REG);
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vm_offset_t va;
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vm_offset_t pa;
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int reg;
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switch (data & PCI_CLASS_MASK) {
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case PCI_CLASS_PREHISTORIC:
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if ((data & PCI_SUBCLASS_MASK)
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!= PCI_SUBCLASS_PREHISTORIC_VGA)
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break;
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case PCI_CLASS_DISPLAY:
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for (reg = PCI_MAP_REG_START;
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reg < PCI_MAP_REG_END;
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reg += 4) {
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data = pci_map_mem(tag, reg, &va, &pa);
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if (data == 0)
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printf (
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"pci%d:%d: mapped VGA-like device at physaddr 0x%lx\n",
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bus, device, (u_long)pa);
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}
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continue;
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};
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#ifndef PCI_QUIET
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printf("pci%d:%d: ", bus, device);
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not_supported (tag, type);
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#endif
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};
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if (!drp) {
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if(dvp->pd_flags & PDF_LOADABLE) {
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printf("%s: loadable device on pci%d:%d\n",
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dvp->pd_name, bus, device);
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}
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continue;
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}
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/*
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** found it.
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** probe returns the device unit.
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*/
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unit = (*drp->probe) (tag);
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if (unit<0) {
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printf ("%s <%s>: probe failed on pci%d:%d\n",
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dvp->pd_name, drp->name, bus, device);
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continue;
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};
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printf ("%s%d <%s>", dvp->pd_name, unit, drp->name);
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/*
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** install interrupts
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*/
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data = pci_conf_read (tag, PCI_INTERRUPT_REG);
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intpin = PCI_INTERRUPT_PIN_EXTRACT(data);
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if (intpin) {
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int idx=NPCI;
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/*
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** Usage of int line register (if set by bios)
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** Matt Thomas <thomas@lkg.dec.com>
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*/
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isanum = PCI_INTERRUPT_LINE_EXTRACT(data);
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if (isanum) {
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/*
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** @INT@ FIXME!!!
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**
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** Should try to use "register_interupt"
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** at this point.
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*/
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printf (" line=%d", isanum);
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for (idx = 0; idx < NPCI; idx++) {
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if (pcidata[idx].isanum == isanum)
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break;
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};
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};
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/*
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** Or take the device number as index ...
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*/
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if (idx >= NPCI) idx = device;
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/*
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** And install the interrupt.
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*/
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if (idx<NPCI) {
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u_short entry = pcidata[idx].number;
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printf (" irq %c", 0x60+intpin);
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if (entry < PCI_MAX_DPI) {
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pcidata[idx].vector[entry].proc = drp->intr;
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pcidata[idx].vector[entry].unit = unit;
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entry++;
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};
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printf (" isa=%d [%d]",pcidata[idx].isanum, entry);
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pcidata[idx].number=entry;
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} else {
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printf (" no int");
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};
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};
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/*
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** enable memory access
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*/
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data = pci_conf_read (tag, PCI_COMMAND_STATUS_REG)
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& 0xffff | PCI_COMMAND_MEM_ENABLE;
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pci_conf_write (tag, (u_char) PCI_COMMAND_STATUS_REG, data);
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/*
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** attach device
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** may produce additional log messages,
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** i.e. when installing subdevices.
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*/
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printf (" on pci%d:%d\n", bus, device);
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(void) (*drp->attach) (tag);
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}
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#ifndef PCI_QUIET
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printf ("pci uses physical addresses from 0x%lx to 0x%lx\n",
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(u_long)PCI_PMEM_START, (u_long)pci_paddr);
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#endif
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}
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/*-----------------------------------------------------------------------
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**
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** Map device into port space.
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**
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** PCI-Specification: 6.2.5.1: address maps
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**
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**-----------------------------------------------------------------------
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*/
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int pci_map_port (pcici_t tag, u_long reg, u_short* pa)
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{
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/*
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** @MAPIO@ not yet implemented.
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*/
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return (ENOSYS);
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}
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/*-----------------------------------------------------------------------
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**
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** Map device into virtual and physical space
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**
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** PCI-Specification: 6.2.5.1: address maps
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**
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**-----------------------------------------------------------------------
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*/
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int pci_map_mem (pcici_t tag, u_long reg, vm_offset_t* va, vm_offset_t* pa)
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{
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u_long data;
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vm_size_t vsize;
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vm_offset_t vaddr;
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/*
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** sanity check
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*/
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if (reg <= PCI_MAP_REG_START || reg >= PCI_MAP_REG_END || (reg & 3))
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return (EINVAL);
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/*
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** get size and type of memory
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**
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** type is in the lowest four bits.
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** If device requires 2^n bytes, the next
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** n-4 bits are read as 0.
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*/
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pci_conf_write (tag, reg, 0xfffffffful);
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data = pci_conf_read (tag, reg);
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switch (data & 0x0f) {
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case PCI_MAP_MEMORY_TYPE_32BIT: /* 32 bit non cachable */
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break;
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default: /* unknown */
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return (EINVAL);
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};
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/*
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** mask out the type,
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** and round up to a page size
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*/
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vsize = round_page (-(data & PCI_MAP_MEMORY_ADDRESS_MASK));
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if (!vsize) return (EINVAL);
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/*
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** align physical address to virtual size
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*/
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if (data = pci_paddr % vsize)
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pci_paddr += vsize - data;
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vaddr = pmap_mapdev (pci_paddr, vsize);
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if (!vaddr) return (EINVAL);
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#ifndef PCI_QUIET
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/*
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** display values.
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*/
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printf ("\treg%d: virtual=0x%lx physical=0x%lx\n",
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reg, (u_long)vaddr, (u_long)pci_paddr);
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#endif
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/*
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** return them to the driver
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*/
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*va = vaddr;
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*pa = pci_paddr;
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/*
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** set device address
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*/
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pci_conf_write (tag, reg, pci_paddr);
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/*
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** and don't forget to increment pci_paddr
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*/
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pci_paddr += vsize;
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return (0);
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}
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/*-----------------------------------------------------------
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**
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** Mapping of physical to virtual memory
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**
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**-----------------------------------------------------------
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*/
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#if ! (__FreeBSD__ >= 2)
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extern vm_map_t kernel_map;
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static vm_offset_t pmap_mapdev (vm_offset_t paddr, vm_size_t vsize)
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{
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vm_offset_t vaddr,value;
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u_long result;
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vaddr = vm_map_min (kernel_map);
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result = vm_map_find (kernel_map, (void*)0, (vm_offset_t) 0,
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&vaddr, vsize, TRUE);
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if (result != KERN_SUCCESS) {
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printf (" vm_map_find failed(%d)\n", result);
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return (0);
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};
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/*
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** map physical
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*/
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value = vaddr;
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while (vsize >= NBPG) {
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pmap_enter (pmap_kernel(), vaddr, paddr,
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VM_PROT_READ|VM_PROT_WRITE, TRUE);
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vaddr += NBPG;
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paddr += NBPG;
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vsize -= NBPG;
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};
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return (value);
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}
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#endif
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/*-----------------------------------------------------------
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**
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** Display of unknown devices.
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**
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**-----------------------------------------------------------
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*/
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struct vt {
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u_short ident;
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char* name;
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};
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static struct vt VendorTable[] = {
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{0x1002, "ATI TECHNOLOGIES INC"},
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{0x1011, "DIGITAL EQUIPMENT CORP."},
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{0x101A, "NCR"},
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{0x102B, "MATROX"},
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{0x1045, "OPTI"},
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{0x5333, "S3 INC."},
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{0x8086, "INTEL CORPORATION"},
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{0,0}
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};
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static const char *const majclasses[] = {
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"old", "storage", "network", "display",
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"multimedia", "memory", "bridge"
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};
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void not_supported (pcici_t tag, u_long type)
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{
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u_char reg;
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u_long data;
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struct vt * vp;
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/*
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** lookup the names.
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*/
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for (vp=VendorTable; vp->ident; vp++)
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if (vp->ident == (type & 0xffff))
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break;
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/*
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** and display them.
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*/
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if (vp->ident) printf (vp->name);
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else printf ("vendor=0x%lx", type & 0xffff);
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printf (", device=0x%lx", type >> 16);
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data = (pci_conf_read(tag, PCI_CLASS_REG) >> 24) & 0xff;
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if (data < sizeof(majclasses) / sizeof(majclasses[0]))
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printf(", class=%s", majclasses[data]);
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printf (" [not supported]\n");
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for (reg=PCI_MAP_REG_START; reg<PCI_MAP_REG_END; reg+=4) {
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data = pci_conf_read (tag, reg);
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if (!data) continue;
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switch (data&7) {
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case 1:
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case 5:
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printf (" map(%lx): io(%lx)\n", reg, data & ~3);
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break;
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||
case 0:
|
||
printf (" map(%lx): mem32(%lx)\n", reg, data & ~7);
|
||
break;
|
||
case 2:
|
||
printf (" map(%lx): mem20(%lx)\n", reg, data & ~7);
|
||
break;
|
||
case 4:
|
||
printf (" map(%lx): mem64(%lx)\n", reg, data & ~7);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
#endif
|