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09d0c1ca40
freebsd-nq/sys/pci/pci.c
Stefan Eßer 8ec7a852b0 Remove limit of port I/O addresses to 65K, since PCI specifies 32 bit 
port addresses (even though the PC architecture doesn't support them).

Add code to limit the I/O map size based on the lowest set bit of the
address. This cures the problem with the BT946C only having a 16 bit
map register, in voiolation of the PCI specs, without giving up the
general support of >65K port regions.
1996-02-19 00:30:40 +00:00

1778 lines
40 KiB
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/**************************************************************************
**
** $Id: pci.c,v 1.45 1996/02/17 23:57:03 se Exp $
**
** General subroutines for the PCI bus.
** pci_configure ()
**
** FreeBSD
**
**-------------------------------------------------------------------------
**
** Copyright (c) 1994 Wolfgang Stanglmeier. All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**
***************************************************************************
*/
#include "pci.h"
#if NPCI > 0
/*========================================================
**
** #includes and declarations
**
**========================================================
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/proc.h> /* declaration of wakeup(), used by vm.h */
#include <sys/devconf.h>
#include <machine/cpu.h> /* bootverbose */
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <sys/devconf.h>
#include <i386/isa/isa_device.h> /* XXX inthand2_t */
#include <pci/pcivar.h>
#include <pci/pcireg.h>
#include <pci/pcibus.h>
#define PCI_MAX_IRQ (16)
/*========================================================
**
** Structs and Functions
**
**========================================================
*/
struct pci_devconf {
struct kern_devconf pdc_kdc;
struct pci_info pdc_pi;
};
struct pcicb {
struct pcicb *pcicb_next;
struct pcicb *pcicb_up;
struct pcicb *pcicb_down;
pcici_t pcicb_bridge;
u_long pcicb_seen;
u_char pcicb_bus;
u_char pcicb_subordinate;
u_char pcicb_flags;
#define PCICB_ISAMEM 0x01
u_int pcicb_mfrom;
u_int pcicb_mupto;
u_int pcicb_mamount;
u_short pcicb_pfrom;
u_short pcicb_pupto;
u_short pcicb_pamount;
u_char pcicb_bfrom;
u_char pcicb_bupto;
u_long pcicb_iobase;
u_long pcicb_iolimit;
u_long pcicb_membase;
u_long pcicb_memlimit;
u_long pcicb_p_membase;
u_long pcicb_p_memlimit;
};
static int pci_externalize (struct kern_devconf *, struct sysctl_req *);
static int pci_internalize (struct kern_devconf *, struct sysctl_req *);
static void
not_supported (pcici_t tag, u_long type);
static void
pci_bus_config (void);
static int
pci_bridge_config (void);
static int
pci_mfdev (int bus, int device);
/*========================================================
**
** Variables
**
**========================================================
*/
/*
** log2 of safe burst len (in words)
*/
unsigned pci_max_burst_len = 3; /* 2=16Byte, 3=32Byte, 4=64Byte, ... */
unsigned pci_mechanism = 0;
unsigned pci_maxdevice = 0;
static struct pcibus* pcibus;
/*--------------------------------------------------------
**
** Local variables.
**
**--------------------------------------------------------
*/
static int pci_conf_count;
static int pci_info_done;
static struct pcicb pcibus0 = {
NULL, NULL, NULL,
{ 0 },
0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, /* real allocation */
0, 0xFFFF, /* iobase/limit */
0x2000000, 0xFFFFFFFFu, /* nonprefetch membase/limit */
0x2000000, 0xFFFFFFFFu /* prefetch membase/limit */
};
static struct pcicb *pcicb;
/*========================================================
**
** pci_configure ()
**
** Autoconfiguration of pci devices.
**
** May be called more than once.
** Any device is attached only once.
**
** Has to take care of mirrored devices, which are
** entailed by incomplete decoding of pci address lines.
**
**========================================================
*/
void pci_configure()
{
struct pcibus **pbp = (struct pcibus**) pcibus_set.ls_items;
/*
** check pci bus present
*/
while (!pci_maxdevice && (pcibus = *pbp++)) {
(*pcibus->pb_setup)();
}
if (!pci_maxdevice) return;
/*
** hello world ..
*/
for (pcicb = &pcibus0; pcicb != NULL;) {
pci_bus_config ();
if (pcicb->pcicb_down) {
pcicb = pcicb->pcicb_down;
continue;
};
while (pcicb && !pcicb->pcicb_next)
pcicb = pcicb->pcicb_up;
if (pcicb)
pcicb = pcicb->pcicb_next;
}
pci_conf_count++;
}
/*========================================================
**
** Subroutines for configuration.
**
**========================================================
*/
static void
pci_register_io (struct pcicb * cb, u_int base, u_int limit)
{
#ifdef PCI_BRIDGE_DEBUG
if (bootverbose)
printf ("register_io: bus=%d base=%x limit=%x\n",
cb->pcicb_bus, base, limit);
#endif
if (!cb->pcicb_pfrom || base < cb->pcicb_pfrom)
cb->pcicb_pfrom = base;
if (limit > cb->pcicb_pupto)
cb->pcicb_pupto = limit;
/*
** XXX should set bridge io mapping here
** but it can be mapped in 4k blocks only,
** leading to conflicts with isa/eisa ..
*/
}
static void
pci_register_memory (struct pcicb * cb, u_int base, u_int limit)
{
#ifdef PCI_BRIDGE_DEBUG
if (bootverbose)
printf ("register_mem: bus=%d base=%x limit=%x\n",
cb->pcicb_bus, base, limit);
#endif
if (!cb->pcicb_mfrom || base < cb->pcicb_mfrom)
cb->pcicb_mfrom = base;
if (limit > cb->pcicb_mupto)
cb->pcicb_mupto = limit;
/*
** set the bridges mapping
**
** XXX should handle the 1Mb granularity.
*/
if (cb->pcicb_bridge.tag) {
pci_conf_write(cb->pcicb_bridge,
PCI_PCI_BRIDGE_MEM_REG,
(cb->pcicb_memlimit & 0xffff0000) |
(cb->pcicb_membase >> 16));
if (bootverbose)
printf ("\t[pci%d uses memory from %x to %x]\n",
cb->pcicb_bus,
(unsigned) cb->pcicb_membase,
(unsigned) cb->pcicb_memlimit);
}
}
/*
** XXX This function is neither complete nor tested.
** It's only used if the bios hasn't done it's job
** of mapping the pci devices in the physical memory.
*/
static u_int
pci_memalloc (struct pcicb * cb, u_int addr, u_int size)
{
u_int result = 0, limit=0, newbase=0;
#ifdef PCI_BRIDGE_DEBUG
if (bootverbose)
printf ("memalloc: bus=%d addr=%x size=%x ..\n",
cb->pcicb_bus, addr, size);
#endif
if (!cb) goto done;
if (!cb->pcicb_membase) {
printf ("memalloc: bus%d: membase not set.\n",
cb->pcicb_bus);
goto done;
}
/*
** get upper allocation limit
*/
limit = cb->pcicb_memlimit;
if (cb->pcicb_mfrom && cb->pcicb_mfrom <= limit)
limit = cb->pcicb_mfrom-1;
/*
** address fixed, and impossible to allocate ?
*/
if (addr && addr+size-1 > limit)
goto done;
/*
** get possible address
*/
result = addr;
if (!result) result = ((limit + 1) / size - 1) * size;
/*
** if not local available, request from parent.
*/
if (result < cb->pcicb_membase) {
newbase = pci_memalloc (cb->pcicb_up, result, size);
if (newbase) cb->pcicb_membase = result;
else result=0;
}
done:
if (result)
pci_register_memory (cb, result, result+size-1);
#ifdef PCI_BRIDGE_DEBUG
printf ("memalloc: bus=%d addr=%x size=%x --> %x (limit=%x).\n",
cb->pcicb_bus, addr, size, result, limit);
#endif
return (result);
}
/*========================================================
**
** pci_bus_config()
**
** Autoconfiguration of one pci bus.
**
**========================================================
*/
static int
pci_mfdev (int bus, int device)
{
pcici_t tag0,tag1;
int pci_id0, pci_id1;
/*
** Detect a multi-function device that complies to the PCI 2.0 spec
*/
tag0 = pcibus->pb_tag (bus, device, 0);
if (pcibus->pb_read (tag0, PCI_HEADER_MISC) & PCI_HEADER_MULTIFUNCTION)
return 1;
/*
** Well, as always: Theory and implementation of PCI ...
**
** If there is a valid device ID returned for function 1 AND
** the device ID of function 0 and 1 is different OR
** the first mapping register of 0 and 1 differs,
** then assume a multi-function device anyway ...
**
** Example of such a broken device: ISA and IDE chip i83371FB (Triton)
*/
tag1 = pcibus->pb_tag (bus, device, 1);
pci_id1 = pcibus->pb_read (tag1, PCI_ID_REG);
if (pci_id1 != 0xffffffff) {
pci_id0 = pcibus->pb_read (tag0, PCI_ID_REG);
if (pci_id0 != pci_id1)
return 1;
if (pcibus->pb_read (tag0, PCI_MAP_REG_START)
!= pcibus->pb_read (tag1, PCI_MAP_REG_START))
return 1;
}
return 0;
}
static void
pci_bus_config (void)
{
int bus_no;
u_char device;
u_char reg;
pcici_t tag, mtag;
pcidi_t type;
u_long data;
int unit;
u_char pciint;
u_char irq;
struct pci_device *dvp;
struct pci_devconf *pdcp;
/*
** first initialize the bridge (bus controller chip)
*/
bus_no = pci_bridge_config ();
printf ("Probing for devices on PCI bus %d:\n", bus_no);
#ifndef PCI_QUIET
if (bootverbose && !pci_info_done) {
pci_info_done=1;
printf ("\tconfiguration mode %d allows %d devices.\n",
pci_mechanism, pci_maxdevice);
};
#endif
for (device=0; device<pci_maxdevice; device ++) {
char *name = NULL;
struct pci_device **dvpp;
int func, maxfunc = 0;
if ((pcicb->pcicb_seen >> device) & 1)
continue;
for (func=0; func <= maxfunc; func++) {
tag = pcibus->pb_tag (bus_no, device, func);
type = pcibus->pb_read (tag, PCI_ID_REG);
if ((!type) || (type==0xfffffffful)) continue;
/*
** lookup device in ioconfiguration:
*/
dvpp = (struct pci_device **)pcidevice_set.ls_items;
while (dvp = *dvpp++) {
if (dvp->pd_probe) {
if (name=(*dvp->pd_probe)(tag, type))
break;
}
};
/*
** check for mirrored devices.
*/
if (func != 0) {
goto real_device;
}
if (device & 0x10) {
mtag=pcibus->pb_tag (bus_no,
(u_char)(device & ~0x10), 0);
} else if (device & 0x08) {
mtag=pcibus->pb_tag (bus_no,
(u_char)(device & ~0x08), 0);
} else goto real_device;
if (type!=pcibus->pb_read (mtag, PCI_ID_REG))
goto real_device;
for (reg=PCI_MAP_REG_START;reg<PCI_MAP_REG_END;reg+=4)
if (pcibus->pb_read(tag,reg)!=pcibus->pb_read(mtag,reg))
goto real_device;
#ifndef PCI_QUIET
if (dvp==NULL) continue;
if (bootverbose)
printf ("%s? <%s> mirrored on pci%d:%d\n",
dvp->pd_name, name, bus_no, device);
#endif
continue;
real_device:
#ifndef PCI_QUIET
#ifdef PCI_BRIDGE_DEBUG
if (bootverbose) {
printf ("\tconfig header: 0x%08x 0x%08x 0x%08x 0x%08x\n",
pci_conf_read (tag, 0),
pci_conf_read (tag, 4),
pci_conf_read (tag, 8),
pci_conf_read (tag, 12));
}
#endif
#endif
if (func == 0 && pci_mfdev (bus_no, device)) {
maxfunc = 7;
}
if (dvp==NULL) {
#ifndef PCI_QUIET
if (pci_conf_count)
continue;
printf("%s%d:%d: ", pcibus->pb_name, bus_no, device);
not_supported (tag, type);
#endif
continue;
};
pcicb->pcicb_seen |= (1ul << device);
/*
** Get and increment the unit.
*/
unit = (*dvp->pd_count)++;
/*
** ignore device ?
*/
if (!*name) continue;
/*
** Announce this device
*/
printf ("%s%d <%s> rev %d", dvp->pd_name, unit, name,
(unsigned) pci_conf_read (tag, PCI_CLASS_REG) & 0xff);
/*
** Get the int pin number (pci interrupt number a-d)
** from the pci configuration space.
*/
data = pcibus->pb_read (tag, PCI_INTERRUPT_REG);
pciint = PCI_INTERRUPT_PIN_EXTRACT(data);
if (pciint) {
printf (" int %c irq ", 0x60+pciint);
irq = PCI_INTERRUPT_LINE_EXTRACT(data);
/*
** If it's zero, the isa irq number is unknown,
** and we cannot bind the pci interrupt.
*/
if (irq && (irq != 0xff))
printf ("%d", irq);
else
printf ("??");
};
printf (" on pci%d:%d\n", bus_no, device);
/*
** Read the current mapping,
** and update the pcicb fields.
*/
for (reg=PCI_MAP_REG_START;reg<PCI_MAP_REG_END;reg+=4) {
u_int map, addr, size;
data = pci_conf_read(tag, PCI_CLASS_REG);
switch (data & (PCI_CLASS_MASK|PCI_SUBCLASS_MASK)) {
case PCI_CLASS_BRIDGE|PCI_SUBCLASS_BRIDGE_PCI:
continue;
};
map = pcibus->pb_read (tag, reg);
if (!(map & PCI_MAP_MEMORY_ADDRESS_MASK))
continue;
pcibus->pb_write (tag, reg, 0xffffffff);
data = pcibus->pb_read (tag, reg);
pcibus->pb_write (tag, reg, map);
switch (data & 7) {
default:
continue;
case 1:
case 5:
addr = map & PCI_MAP_IO_ADDRESS_MASK;
size = -(data & PCI_MAP_IO_ADDRESS_MASK);
size &= ~(addr ^ -addr);
pci_register_io (pcicb, addr, addr+size-1);
pcicb->pcicb_pamount += size;
break;
case 0:
case 2:
case 4:
size = -(data & PCI_MAP_MEMORY_ADDRESS_MASK);
addr = map & PCI_MAP_MEMORY_ADDRESS_MASK;
if (addr >= 0x100000) {
pci_register_memory
(pcicb, addr, addr+size-1);
pcicb->pcicb_mamount += size;
} else {
pcicb->pcicb_flags |= PCICB_ISAMEM;
};
break;
};
if (bootverbose)
printf ("\tmapreg[%02x] type=%d addr=%08x size=%04x.\n",
reg, map&7, addr, size);
};
/*
** Allocate a devconf structure
** We should, and eventually will, set the
** parent pointer to a pci bus devconf structure,
** and arrange to set the state field dynamically.
*/
pdcp = (struct pci_devconf *)
malloc (sizeof (struct pci_devconf),M_DEVBUF,M_WAITOK);
bzero(pdcp, sizeof(struct pci_devconf));
pdcp -> pdc_pi.pi_bus = bus_no;
pdcp -> pdc_pi.pi_device = device;
pdcp -> pdc_pi.pi_func = func;
pdcp -> pdc_kdc.kdc_name = dvp->pd_name;
pdcp -> pdc_kdc.kdc_unit = unit;
pdcp -> pdc_kdc.kdc_md.mddc_devtype = MDDT_PCI;
pdcp -> pdc_kdc.kdc_externalize = pci_externalize;
pdcp -> pdc_kdc.kdc_internalize = pci_internalize;
pdcp -> pdc_kdc.kdc_datalen = PCI_EXTERNAL_LEN;
pdcp -> pdc_kdc.kdc_parentdata = &pdcp->pdc_pi;
pdcp -> pdc_kdc.kdc_state = DC_UNKNOWN;
pdcp -> pdc_kdc.kdc_description = name;
pdcp -> pdc_kdc.kdc_shutdown = dvp->pd_shutdown;
/*
** And register this device
*/
dev_attach (&pdcp->pdc_kdc);
/*
** attach device
** may produce additional log messages,
** i.e. when installing subdevices.
*/
(*dvp->pd_attach) (tag, unit);
/*
** Special processing of certain classes
*/
data = pci_conf_read(tag, PCI_CLASS_REG);
switch (data & (PCI_CLASS_MASK|PCI_SUBCLASS_MASK)) {
struct pcicb *this, **link;
unsigned char primary, secondary, subordinate;
u_int command;
case PCI_CLASS_BRIDGE|PCI_SUBCLASS_BRIDGE_PCI:
/*
** get current configuration of the bridge.
*/
data = pci_conf_read (tag, PCI_PCI_BRIDGE_BUS_REG);
primary = PCI_PRIMARY_BUS_EXTRACT (data);
secondary = PCI_SECONDARY_BUS_EXTRACT(data);
subordinate = PCI_SUBORDINATE_BUS_EXTRACT(data);
#ifndef PCI_QUIET
if (bootverbose) {
printf ("\tbridge from pci%d to pci%d through %d.\n",
primary, secondary, subordinate);
printf ("\tmapping regs: io:%08lx mem:%08lx pmem:%08lx\n",
pci_conf_read (tag, PCI_PCI_BRIDGE_IO_REG),
pci_conf_read (tag, PCI_PCI_BRIDGE_MEM_REG),
pci_conf_read (tag, PCI_PCI_BRIDGE_PMEM_REG));
}
#endif
/*
** check for uninitialized bridge.
*/
if (secondary == 0 || secondary < primary ||
bus_no != primary)
{
printf ("\tINCORRECTLY or NEVER CONFIGURED.\n");
/*
** disable this bridge
*/
pcibus->pb_write (tag, PCI_COMMAND_STATUS_REG,
0xffff0000);
secondary = 0;
subordinate = 0;
};
/*
** allocate bus descriptor for bus behind the bridge
*/
link = &pcicb->pcicb_down;
while (*link) link = &(*link)->pcicb_next;
this = malloc (sizeof (*this), M_DEVBUF, M_WAITOK);
/*
** Initialize this descriptor so far.
** (the initialization is completed just before
** scanning the bus behind the bridge.
*/
bzero (this, sizeof(*this));
this->pcicb_up = pcicb;
this->pcicb_bridge = tag;
this->pcicb_bus = secondary;
this->pcicb_subordinate = subordinate;
command = pci_conf_read(tag,PCI_COMMAND_STATUS_REG);
if (command & PCI_COMMAND_IO_ENABLE){
/*
** Bridge was configured by the bios.
** Read out the mapped io region.
*/
u_int reg, data, mask;
reg = pci_conf_read (tag,
PCI_PCI_BRIDGE_IO_REG);
pci_conf_write(tag,
PCI_PCI_BRIDGE_IO_REG, 0xFFFF);
data = pci_conf_read (tag,
PCI_PCI_BRIDGE_IO_REG);
pci_conf_write(tag,
PCI_PCI_BRIDGE_IO_REG, reg & 0xffff);
mask = (0xFF00 ^ (data & 0xFF00)) | 0xFF;
this->pcicb_iobase =
PCI_PPB_IOBASE_EXTRACT (reg);
this->pcicb_iolimit =
PCI_PPB_IOLIMIT_EXTRACT(reg) | mask;
/*
** Note the used io space.
*/
pci_register_io (pcicb, this->pcicb_iobase,
this->pcicb_iolimit);
};
if (command & PCI_COMMAND_MEM_ENABLE) {
/*
** Bridge was configured by the bios.
** Read out the mapped memory regions.
*/
u_int reg, data, mask;
/*
** non prefetchable memory
*/
reg = pci_conf_read (tag,
PCI_PCI_BRIDGE_MEM_REG);
pci_conf_write(tag,
PCI_PCI_BRIDGE_MEM_REG, 0xFFFFFFFF);
data = pci_conf_read (tag,
PCI_PCI_BRIDGE_MEM_REG);
pci_conf_write(tag,
PCI_PCI_BRIDGE_MEM_REG, reg);
mask = 0xFFFFFFFF ^ (data & 0xFFFF0000);
this->pcicb_membase =
PCI_PPB_MEMBASE_EXTRACT (reg);
this->pcicb_memlimit =
PCI_PPB_MEMLIMIT_EXTRACT(reg) | mask;
/*
** Register used memory space.
*/
pci_register_memory (pcicb,
this->pcicb_membase,
this->pcicb_memlimit);
/*
** prefetchable memory
*/
reg = pci_conf_read (tag,
PCI_PCI_BRIDGE_PMEM_REG);
pci_conf_write(tag,
PCI_PCI_BRIDGE_PMEM_REG, 0xFFFFFFFF);
data = pci_conf_read (tag,
PCI_PCI_BRIDGE_PMEM_REG);
pci_conf_write(tag,
PCI_PCI_BRIDGE_PMEM_REG, reg);
mask = 0xFFFFFFFF ^ (data & 0xFFFF0000);
this->pcicb_p_membase=
PCI_PPB_MEMBASE_EXTRACT (reg);
this->pcicb_p_memlimit=
PCI_PPB_MEMLIMIT_EXTRACT(reg) | mask;
/*
** Register used memory space.
*/
pci_register_memory (pcicb,
this->pcicb_p_membase,
this->pcicb_p_memlimit);
}
/*
** Link it in chain.
*/
*link=this;
/*
** Update mapping info of parent bus.
*/
if (!pcicb->pcicb_bfrom||secondary< pcicb->pcicb_bfrom)
pcicb->pcicb_bfrom = secondary;
if (subordinate > pcicb->pcicb_bupto)
pcicb->pcicb_bupto = subordinate;
break;
}
}
}
#ifndef PCI_QUIET
if (bootverbose) {
if (pcicb->pcicb_mamount)
printf ("%s%d: uses %d bytes of memory from %x upto %x.\n",
pcibus->pb_name, bus_no,
pcicb->pcicb_mamount,
pcicb->pcicb_mfrom, pcicb->pcicb_mupto);
if (pcicb->pcicb_pamount)
printf ("%s%d: uses %d bytes of I/O space from %x upto %x.\n",
pcibus->pb_name, bus_no,
pcicb->pcicb_pamount,
pcicb->pcicb_pfrom, pcicb->pcicb_pupto);
if (pcicb->pcicb_bfrom)
printf ("%s%d: subordinate busses from %x upto %x.\n",
pcibus->pb_name, bus_no,
pcicb->pcicb_bfrom, pcicb->pcicb_bupto);
}
#endif
}
/*========================================================
**
** pci_bridge_config()
**
** Configuration of a pci bridge.
**
**========================================================
*/
static int
pci_bridge_config (void)
{
pcici_t tag;
struct pcicb* parent;
tag = pcicb->pcicb_bridge;
if (tag.tag) {
if (!pcicb->pcicb_bus) {
u_int data;
/*
** Get the lowest available bus number.
*/
pcicb->pcicb_bus = ++pcibus0.pcicb_subordinate;
/*
** and configure the bridge
*/
data = pci_conf_read (tag, PCI_PCI_BRIDGE_BUS_REG);
data = PCI_PRIMARY_BUS_INSERT(data, pcicb->pcicb_up->pcicb_bus);
data = PCI_SECONDARY_BUS_INSERT(data, pcicb->pcicb_bus);
data = PCI_SUBORDINATE_BUS_INSERT(data, pcicb->pcicb_bus);
pci_conf_write (tag, PCI_PCI_BRIDGE_BUS_REG, data);
/*
** Propagate the new upper bus number limit.
*/
for (parent = pcicb->pcicb_up; parent != NULL;
parent = parent->pcicb_up)
{
if (parent->pcicb_subordinate >= pcicb->pcicb_bus)
continue;
parent->pcicb_subordinate = pcicb->pcicb_bus;
if (!parent->pcicb_bridge.tag)
continue;
data = pci_conf_read
(parent->pcicb_bridge, PCI_PCI_BRIDGE_BUS_REG);
data = PCI_SUBORDINATE_BUS_INSERT
(data, pcicb->pcicb_bus);
pci_conf_write (parent->pcicb_bridge,
PCI_PCI_BRIDGE_BUS_REG, data);
}
}
if (!pcicb->pcicb_membase) {
u_int size = 0x100000;
pcicb->pcicb_membase = pci_memalloc (pcicb->pcicb_up, 0, size);
if (pcicb->pcicb_membase)
pcicb->pcicb_memlimit = pcicb->pcicb_membase+size-1;
}
}
return pcicb->pcicb_bus;
}
/*-----------------------------------------------------------------
**
** The following functions are provided for the device driver
** to read/write the configuration space.
**
** pci_conf_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).
**
** pci_conf_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.
**
**-----------------------------------------------------------------
*/
u_long
pci_conf_read (pcici_t tag, u_long reg)
{
return (pcibus->pb_read (tag, reg));
}
void
pci_conf_write (pcici_t tag, u_long reg, u_long data)
{
pcibus->pb_write (tag, reg, data);
}
/*-----------------------------------------------------------------------
**
** Map device into port space.
**
** Actually the device should have been mapped by the bios.
** This function only reads and verifies the value.
**
** PCI-Specification: 6.2.5.1: address maps
**
**-----------------------------------------------------------------------
*/
int pci_map_port (pcici_t tag, u_long reg, u_short* pa)
{
unsigned data, ioaddr, iosize;
struct pcicb *link = pcicb;
/*
** sanity check
*/
if (reg < PCI_MAP_REG_START || reg >= PCI_MAP_REG_END || (reg & 3)) {
printf ("pci_map_port failed: bad register=0x%x\n",
(unsigned)reg);
return (0);
};
/*if (pcicb->pcicb_flags & PCICB_NOIOSET) {
printf ("pci_map_port failed: pci%d has not been configured for I/O access\n",
pcicb->pcicb_bus);
return (0);
}*/
/*
** get size and type of port
**
** type is in the lowest two bits.
** If device requires 2^n bytes, the next
** n-2 bits are hardwired as 0.
*/
ioaddr = pcibus->pb_read (tag, reg) & PCI_MAP_IO_ADDRESS_MASK;
if (!ioaddr) {
printf ("pci_map_port failed: not configured by bios.\n");
return (0);
};
pcibus->pb_write (tag, reg, 0xfffffffful);
data = pcibus->pb_read (tag, reg);
pcibus->pb_write (tag, reg, ioaddr);
if ((data & 0x03) != PCI_MAP_IO) {
printf ("pci_map_port failed: bad port type=0x%x\n",
(unsigned) data);
return (0);
};
iosize = -(data & PCI_MAP_IO_ADDRESS_MASK);
iosize &= ~(ioaddr ^ -ioaddr);
if (ioaddr < pcicb->pcicb_iobase
|| ioaddr + iosize -1 > pcicb->pcicb_iolimit) {
printf ("pci_map_port failed: device's iorange 0x%x-0x%x "
"is incompatible with its bridge's range 0x%x-0x%x\n",
(unsigned) ioaddr, (unsigned) ioaddr + iosize - 1,
(unsigned) pcicb->pcicb_iobase,
(unsigned) pcicb->pcicb_iolimit);
return (0);
}
#ifndef PCI_QUIET
if (bootverbose)
printf ("\treg%d: ioaddr=0x%x size=0x%x\n",
(unsigned) reg, (unsigned) ioaddr, (unsigned) iosize);
#endif
/*
** set the configuration register of and
** return the address to the driver.
** Make sure to enable each upstream bridge
** so I/O and DMA can go all the way.
*/
for (;;) {
data = pcibus->pb_read (tag, PCI_COMMAND_STATUS_REG) & 0xffff;
data |= PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MASTER_ENABLE;
(void) pcibus->pb_write(tag, PCI_COMMAND_STATUS_REG, data);
if ((link = link->pcicb_up) == NULL)
break;
tag = link->pcicb_bridge;
}
*pa = ioaddr;
return (1);
}
/*-----------------------------------------------------------------------
**
** Map device into virtual and physical space
**
** Actually the device should have been mapped by the bios.
** This function only reads and verifies the value.
**
** PCI-Specification: 6.2.5.1: address maps
**
**-----------------------------------------------------------------------
*/
int pci_map_mem (pcici_t tag, u_long reg, vm_offset_t* va, vm_offset_t* pa)
{
struct pcicb *link = pcicb;
unsigned data ,paddr;
vm_size_t psize, poffs;
vm_offset_t vaddr;
/*
** sanity check
*/
if (reg < PCI_MAP_REG_START || reg >= PCI_MAP_REG_END || (reg & 3)) {
printf ("pci_map_mem failed: bad register=0x%x\n",
(unsigned)reg);
return (0);
};
/*
** save old mapping, get size and type of memory
**
** type is in the lowest four bits.
** If device requires 2^n bytes, the next
** n-4 bits are read as 0.
*/
paddr = pcibus->pb_read (tag, reg) & PCI_MAP_MEMORY_ADDRESS_MASK;
pcibus->pb_write (tag, reg, 0xfffffffful);
data = pcibus->pb_read (tag, reg);
pcibus->pb_write (tag, reg, paddr);
/*
** check the type
*/
if ((data & PCI_MAP_MEMORY_TYPE_MASK) != PCI_MAP_MEMORY_TYPE_32BIT) {
printf ("pci_map_mem failed: bad memory type=0x%x\n",
(unsigned) data);
return (0);
};
/*
** get the size.
*/
psize = -(data & PCI_MAP_MEMORY_ADDRESS_MASK);
if (!paddr || paddr == PCI_MAP_MEMORY_ADDRESS_MASK) {
paddr = pci_memalloc (pcicb, 0, psize);
if (!paddr) {
printf ("pci_map_mem: not configured by bios.\n");
return (0);
};
pci_register_memory (pcicb, paddr, paddr+psize-1);
};
if (paddr < pcicb->pcicb_membase ||
paddr + psize - 1 > pcicb->pcicb_memlimit) {
printf ("pci_map_mem failed: device's memrange 0x%x-0x%x is "
"incompatible with its bridge's memrange 0x%x-0x%x\n",
(unsigned) paddr,
(unsigned) (paddr + psize - 1),
(unsigned) pcicb->pcicb_membase,
(unsigned) pcicb->pcicb_memlimit);
/* return (0);*/
/* ACHTUNG: Ist der Code richtig, wenn eine PCI-PCI-Bridge fuer
* die PCI-Slots verwendet wird, aber die Onboard-Devices direkt
* an der CPU-PCI-Bridge haengen (Siehe Compaq Prolinea Problem) ???
*/
}
pcibus->pb_write (tag, reg, paddr);
/*
** Truncate paddr to page boundary.
** (Or does pmap_mapdev the job?)
*/
poffs = paddr - trunc_page (paddr);
vaddr = (vm_offset_t) pmap_mapdev (paddr-poffs, psize+poffs);
if (!vaddr) return (0);
vaddr += poffs;
#ifndef PCI_QUIET
/*
** display values.
*/
if (bootverbose)
printf ("\treg%d: virtual=0x%lx physical=0x%lx size=0x%lx\n",
(unsigned) reg, (u_long)vaddr, (u_long)paddr, (u_long)psize);
#endif
/*
** set the configuration register and
** return the address to the driver
** Make sure to enable each upstream bridge
** so memory and DMA can go all the way.
*/
for (;;) {
data = pcibus->pb_read (tag, PCI_COMMAND_STATUS_REG) & 0xffff;
data |= PCI_COMMAND_MEM_ENABLE | PCI_COMMAND_MASTER_ENABLE;
(void) pcibus->pb_write(tag, PCI_COMMAND_STATUS_REG, data);
if ((link = link->pcicb_up) == NULL)
break;
tag = link->pcicb_bridge;
}
*va = vaddr;
*pa = paddr;
return (1);
}
/*------------------------------------------------------------
**
** Interface functions for the devconf module.
**
**------------------------------------------------------------
*/
static int
pci_externalize (struct kern_devconf *kdcp, struct sysctl_req *req)
{
struct pci_externalize_buffer buffer;
struct pci_info * pip = kdcp->kdc_parentdata;
pcici_t tag;
int i;
tag = pcibus->pb_tag (pip->pi_bus, pip->pi_device, pip->pi_func);
buffer.peb_pci_info = *pip;
for (i=0; i<PCI_EXT_CONF_LEN; i++) {
buffer.peb_config[i] = pcibus->pb_read (tag, i*4);
};
return SYSCTL_OUT(req, &buffer, sizeof buffer);
}
static int
pci_internalize (struct kern_devconf *kdcp, struct sysctl_req *re)
{
return EOPNOTSUPP;
}
/*-----------------------------------------------------------------------
**
** Pci meta interrupt handler
**
** This handler assumes level triggered interrupts.
** It's possible to build a kernel which handles shared
** edge triggered interrupts by the options "PCI_EDGE_INT".
** But there is a performance penalty.
**
** (Of course you can delete the #ifdef PCI_EDGE_INT bracketed
** code at all :-) :-) :-)
**
**-----------------------------------------------------------------------
*/
static struct pci_int_desc*
pci_int_desc [PCI_MAX_IRQ];
#ifndef NO_SHARED_IRQ
static inline unsigned
splq (unsigned mask)
{
unsigned temp=cpl;
cpl |= mask;
return temp;
}
static void
pci_int (int irq)
{
struct pci_int_desc * p;
int s;
if (irq<0 || irq >= PCI_MAX_IRQ) {
printf ("pci_int: irq %d out of range, ignored\n", irq);
return;
};
for (p = pci_int_desc[irq]; p!=NULL; p=p->pcid_next) {
s = splq (*p->pcid_maskptr);
(*p->pcid_handler) (p->pcid_argument);
p-> pcid_tally++;
splx (s);
#if 0
if (p->pcid_tally<20)
printf ("PCI_INT: irq=%d h=%p cpl o=%x n=%x val=%d\n",
irq, p->pcid_handler, s, cpl, c);
#endif
};
}
#endif
/*-----------------------------------------------------------------------
**
** Auxiliary function for interrupt (un)mapping.
**
**-----------------------------------------------------------------------
*/
static u_int
getirq (pcici_t tag)
{
u_int irq;
irq = PCI_INTERRUPT_LINE_EXTRACT(
pcibus->pb_read (tag, PCI_INTERRUPT_REG));
if (irq <= 0) {
printf ("\tint line register not set by bios\n");
return (0);
}
if (irq >= pcibus->pb_maxirq || irq >= PCI_MAX_IRQ) {
printf ("\tirq %d invalid.\n", irq);
return (0);
}
return (irq);
}
static struct pci_int_desc **
getintdescbytag (u_int irq, pcici_t tag)
{
struct pci_int_desc *p, **pp;
pp=&pci_int_desc[irq];
while (((p=*pp)) && !sametag(p->pcid_tag,tag))
pp=&p->pcid_next;
if (!p) return (NULL);
return (pp);
}
static struct pci_int_desc *
getintdescbymptr (u_int irq, unsigned * mptr)
{
struct pci_int_desc *p;
for (p=pci_int_desc[irq];p;p=p->pcid_next)
if (p->pcid_maskptr == mptr) break;
return (p);
}
/*-----------------------------------------------------------------------
**
** Map pci interrupt.
**
**-----------------------------------------------------------------------
*/
static unsigned pci_mask0 = 0;
int pci_map_int (pcici_t tag, pci_inthand_t *func, void *arg, unsigned *maskptr)
{
u_int irq;
int result, oldspl;
unsigned mask;
struct pci_int_desc *tail, *mdp=NULL, *new=NULL;
/*
** Get irq line from configuration space,
** and check for consistency.
*/
irq = getirq (tag);
if (irq >= PCI_MAX_IRQ) {
printf ("\tillegal irq %d.\n", irq);
return (0);
};
mask= 1ul << irq;
/*
** disable this interrupt.
*/
oldspl = splq (mask);
/*
** If handler for this tag already installed,
** remove it first.
*/
if (getintdescbytag (irq, tag) != NULL)
pci_unmap_int (tag);
/*
** If this irq not yet included in the mask, include it.
*/
mdp = getintdescbymptr (irq, maskptr);
if (!mdp) {
result = pcibus->pb_imaskinc (irq, maskptr);
if (result)
goto conflict;
};
/*
** Allocate descriptor and initialize it.
*/
tail = pci_int_desc[irq];
new = malloc (sizeof (*new), M_DEVBUF, M_WAITOK);
bzero (new, sizeof (*new));
new->pcid_next = tail;
new->pcid_tag = tag;
new->pcid_handler = func;
new->pcid_argument = arg;
new->pcid_maskptr = maskptr;
new->pcid_tally = 0;
new->pcid_mask = mask;
/*
** If first handler: install it.
** If second handler: install shared-int-handler.
*/
if (!tail) {
/*
** first handler for this irq.
*/
result = pcibus->pb_iattach
/*
* XXX if we get here, then `func' must be pci_int
* so the bogus casts are almost OK since they just
* undo the bogus casts that were needed to pass
* pci_int and its arg to pci_map_int().
*/
(irq, (inthand2_t *) func, (int) arg, maskptr);
if (result) goto conflict;
#ifdef NO_SHARED_IRQ
} else goto conflict;
#else
} else if (!tail->pcid_next) {
/*
** Second handler for this irq.
*/
if (bootverbose)
printf ("\tusing shared irq %d.\n", irq);
/*
** replace old handler by shared-int-handler.
*/
result = pcibus->pb_idetach (irq,
(inthand2_t *) tail->pcid_handler);
if (result)
printf ("\tCANNOT DETACH INT HANDLER.\n");
result = pcibus->pb_iattach (irq, pci_int, irq, &pci_mask0);
if (result) {
printf ("\tCANNOT ATTACH SHARED INT HANDLER.\n");
goto fail;
};
}
#endif
/*
** Link new descriptor, reenable ints and done.
*/
pci_int_desc[irq] = new;
splx (oldspl);
return (1);
/*
** Handle some problems.
*/
conflict:
printf ("\tirq %d already in use.\n", irq);
fail:
/*
** If descriptor allocated, free it.
** If included in mask, remove it.
*/
if (new) free(new, M_DEVBUF);
if (!mdp) (void) pcibus->pb_imaskexc (irq, maskptr);
splx (oldspl);
return (0);
}
/*-----------------------------------------------------------------------
**
** Unmap pci interrupt.
**
**-----------------------------------------------------------------------
*/
int pci_unmap_int (pcici_t tag)
{
int result, oldspl;
struct pci_int_desc *this, **hook, *tail;
unsigned irq;
/*
** Get irq line from configuration space,
** and check for consistency.
*/
irq = getirq (tag);
if (irq >= PCI_MAX_IRQ) {
printf ("\tillegal irq %d.\n", irq);
return (0);
};
/*
** Search and unlink interrupt descriptor.
*/
hook = getintdescbytag (irq, tag);
if (hook == NULL) {
printf ("\tno irq %d handler for pci %x\n",
irq, tag.tag);
return (0);
};
this = *hook;
*hook= this->pcid_next;
/*
** Message
*/
printf ("\tirq %d handler %p(%p) unmapped for pci %x after %d ints.\n",
irq, this->pcid_handler, this->pcid_argument,
this->pcid_tag.tag, this->pcid_tally);
/*
** If this irq no longer included in the mask, remove it.
*/
if (!getintdescbymptr (irq, this->pcid_maskptr))
(void) pcibus->pb_imaskexc (irq, this->pcid_maskptr);
tail = pci_int_desc[irq];
if (tail == NULL) {
/*
** Remove the old handler.
*/
result = pcibus->pb_idetach (irq,
(inthand2_t *) this->pcid_handler);
if (result)
printf ("\tirq %d: cannot remove handler.\n", irq);
} else if (tail->pcid_next == NULL) {
/*
** Remove the shared int handler.
** Install the last remaining handler.
*/
oldspl = splq (1ul << irq);
result = pcibus->pb_idetach (irq, pci_int);
if (result)
printf ("\tirq %d: cannot remove handler.\n", irq);
result = pcibus->pb_iattach (irq,
(inthand2_t *) tail->pcid_handler,
(int) tail->pcid_argument,
tail->pcid_maskptr);
if (result)
printf ("\tirq %d: cannot install handler.\n", irq);
splx (oldspl);
};
free (this, M_DEVBUF);
return (1);
}
/*-----------------------------------------------------------
**
** Display of unknown devices.
**
**-----------------------------------------------------------
*/
struct vt {
u_short ident;
char* name;
};
static struct vt VendorTable[] = {
{0x0e11, "Compaq"},
{0x1000, "NCR/Symbios"},
{0x1002, "ATI Technologies Inc."},
{0x1004, "VLSI"},
{0x100B, "National Semiconductor"},
{0x100E, "Weitek"},
{0x1011, "Digital Equipment Corporation"},
{0x1013, "Cirrus Logic"},
{0x101A, "NCR"},
{0x1022, "AMD"},
{0x102B, "Matrox"},
{0x102C, "Chips & Technologies"},
{0x1039, "Silicon Integrated Systems"},
{0x1042, "SMC"},
{0x1044, "DPT"},
{0x1045, "OPTI"},
{0x104B, "Bus Logic"},
{0x1060, "UMC"},
{0x1080, "Contaq"},
{0x1095, "CMD"},
{0x10b9, "ACER Labs"},
{0x1106, "VIA Technologies"},
{0x5333, "S3 Inc."},
{0x8086, "Intel Corporation"},
{0x9004, "Adaptec"},
{0,0}
};
typedef struct {
const int subclass;
const char *name;
} subclass_name;
/* 0x00 prehistoric subclasses */
static const subclass_name old_subclasses[] =
{
{ 0x00, "misc" },
{ 0x01, "vga" },
{ 0x00, NULL }
};
/* 0x01 mass storage subclasses */
static const subclass_name storage_subclasses[] =
{
{ 0x00, "scsi" },
{ 0x01, "ide" },
{ 0x02, "floppy"},
{ 0x03, "ipi" },
{ 0x80, "misc" },
{ 0x00, NULL }
};
/* 0x02 network subclasses */
static const subclass_name network_subclasses[] =
{
{ 0x00, "ethernet" },
{ 0x01, "tokenring" },
{ 0x02, "fddi" },
{ 0x80, "misc" },
{ 0x00, NULL }
};
/* 0x03 display subclasses */
static const subclass_name display_subclasses[] =
{
{ 0x00, "vga" },
{ 0x01, "xga" },
{ 0x80, "misc" },
{ 0x00, NULL }
};
/* 0x04 multimedia subclasses */
static const subclass_name multimedia_subclasses[] =
{
{ 0x00, "video" },
{ 0x01, "audio" },
{ 0x80, "misc" },
{ 0x00, NULL }
};
/* 0x05 memory subclasses */
static const subclass_name memory_subclasses[] =
{
{ 0x00, "ram" },
{ 0x01, "flash" },
{ 0x80, "misc" },
{ 0x00, NULL }
};
/* 0x06 bridge subclasses */
static const subclass_name bridge_subclasses[] =
{
{ 0x00, "host" },
{ 0x01, "isa" },
{ 0x02, "eisa" },
{ 0x03, "mc" },
{ 0x04, "pci" },
{ 0x05, "pcmcia"},
{ 0x80, "misc" },
{ 0x00, NULL }
};
static const subclass_name *const subclasses[] = {
old_subclasses,
storage_subclasses,
network_subclasses,
display_subclasses,
multimedia_subclasses,
memory_subclasses,
bridge_subclasses,
};
static const char *const majclasses[] = {
"old",
"storage",
"network",
"display",
"multimedia",
"memory",
"bridge"
};
void not_supported (pcici_t tag, u_long type)
{
u_long reg;
u_long data;
u_char class;
u_char subclass;
struct vt * vp;
int pciint;
int irq;
/*
** lookup the names.
*/
for (vp=VendorTable; vp->ident; vp++)
if (vp->ident == (type & 0xffff))
break;
/*
** and display them.
*/
if (vp->ident) printf (vp->name);
else printf ("vendor=0x%04lx", type & 0xffff);
printf (", device=0x%04lx", type >> 16);
data = pcibus->pb_read(tag, PCI_CLASS_REG);
class = (data >> 24) & 0xff;
subclass = (data >> 16) & 0xff;
if (class < sizeof(majclasses) / sizeof(majclasses[0])) {
printf(", class=%s", majclasses[class]);
} else {
printf(", class=0x%02x", class);
}
if (subclass < sizeof(subclasses) / sizeof(subclasses[0])) {
const subclass_name *p = subclasses[class];
while (p->name && (p->subclass != subclass))
p++;
if (p->name) {
printf(" (%s)", p->name);
} else {
printf(" (unknown subclass 0x%02lx)", subclass);
}
} else {
printf(", subclass=0x%02x", subclass);
}
data = pcibus->pb_read (tag, PCI_INTERRUPT_REG);
pciint = PCI_INTERRUPT_PIN_EXTRACT(data);
if (pciint) {
printf (" int %c irq ", 0x60+pciint);
irq = PCI_INTERRUPT_LINE_EXTRACT(data);
/*
** If it's zero, the isa irq number is unknown,
** and we cannot bind the pci interrupt.
*/
if (irq && (irq != 0xff))
printf ("%d", irq);
else
printf ("??");
};
if (class != (PCI_CLASS_BRIDGE >> 24))
printf (" [no driver assigned]");
printf ("\n");
if (bootverbose) {
if (class == (PCI_CLASS_BRIDGE >> 24)) {
printf ("configuration space registers:");
for (reg = 0; reg < 0x100; reg+=4) {
if ((reg & 0x0f) == 0) printf ("\n%02x:\t", reg);
printf ("%08x ", pcibus->pb_read (tag, reg));
}
printf ("\n");
} else {
for (reg=PCI_MAP_REG_START; reg<PCI_MAP_REG_END; reg+=4) {
data = pcibus->pb_read (tag, reg);
if ((data&~7)==0) continue;
switch (data&7) {
case 1:
case 5:
printf ("\tmap(%x): io(%04lx)\n",
reg, data & ~3);
break;
case 0:
printf ("\tmap(%x): mem32(%08lx)\n",
reg, data & ~7);
break;
case 2:
printf ("\tmap(%x): mem20(%05lx)\n",
reg, data & ~7);
break;
case 4:
printf ("\tmap(%x): mem64(%08x%08lx)\n",
reg, pcibus->pb_read (tag, reg +4), data & ~7);
reg += 4;
break;
}
}
}
}
}
#endif /* NPCI */
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