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NetBSD/sys/dev/pci/pciconf.c

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/* $NetBSD: pciconf.c,v 1.14 2001/11/28 23:48:34 thorpej Exp $ */
/*
* Copyright 2001 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Allen Briggs for Wasabi Systems, Inc.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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.
*/
/*
* Derived in part from code from PMON/2000 (http://pmon.groupbsd.org/).
*/
/*
* To do:
* - Perform all data structure allocation dynamically, don't have
* statically-sized arrays ("oops, you lose because you have too
* many slots filled!")
* - Do this in 2 passes, with an MD hook to control the behavior:
* (1) Configure the bus (possibly including expansion
* ROMs.
* (2) Another pass to disable expansion ROMs if they're
* mapped (since you're not supposed to leave them
* mapped when you're not using them).
* This would facilitate MD code executing the expansion ROMs
* if necessary (possibly with an x86 emulator) to configure
* devices (e.g. VGA cards).
* - Deal with "anything can be hot-plugged" -- i.e., carry configuration
* information around & be able to reconfigure on the fly
* - Deal with segments (See IA64 System Abstraction Layer)
* - Deal with subtractive bridges (& non-spec positive/subtractive decode)
* - Deal with ISA/VGA/VGA palette snooping
* - Deal with device capabilities on bridges
* - Worry about changing a bridge to/from transparency
* From thorpej (05/25/01)
* - Try to handle devices that are already configured (perhaps using that
* as a hint to where we put other devices)
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pciconf.c,v 1.14 2001/11/28 23:48:34 thorpej Exp $");
#include "opt_pci.h"
#include <sys/param.h>
#include <sys/extent.h>
#include <sys/queue.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pciconf.h>
#include <dev/pci/pcidevs.h>
int pci_conf_debug = 0;
#if !defined(MIN)
#define MIN(a,b) (((a)<(b))?(a):(b))
#define MAX(a,b) (((a)>(b))?(a):(b))
#endif
/* per-bus constants. */
#define MAX_CONF_DEV 32 /* Arbitrary */
#define MAX_CONF_MEM (3 * MAX_CONF_DEV) /* Avg. 3 per device -- Arb. */
#define MAX_CONF_IO (3 * MAX_CONF_DEV) /* Avg. 1 per device -- Arb. */
#define PCI_BUSNO_SPACING (1 << 5)
struct _s_pciconf_bus_t; /* Forward declaration */
typedef struct _s_pciconf_dev_t {
int ipin;
int iline;
int min_gnt;
int max_lat;
int enable;
pcitag_t tag;
pci_chipset_tag_t pc;
struct _s_pciconf_bus_t *ppb; /* I am really a bridge */
} pciconf_dev_t;
typedef struct _s_pciconf_win_t {
pciconf_dev_t *dev;
int reg; /* 0 for busses */
int align;
int prefetch;
u_int64_t size;
u_int64_t address;
} pciconf_win_t;
typedef struct _s_pciconf_bus_t {
int busno;
int next_busno;
int last_busno;
int busno_spacing;
int max_mingnt;
int min_maxlat;
int cacheline_size;
int prefetch;
int fast_b2b;
int freq_66;
int def_ltim;
int max_ltim;
int bandwidth_used;
int swiz;
int io_32bit;
int pmem_64bit;
int ndevs;
pciconf_dev_t device[MAX_CONF_DEV];
/* These should be sorted in order of decreasing size */
int nmemwin;
pciconf_win_t pcimemwin[MAX_CONF_MEM];
int niowin;
pciconf_win_t pciiowin[MAX_CONF_IO];
bus_size_t io_total;
bus_size_t mem_total;
bus_size_t pmem_total;
struct extent *ioext;
struct extent *memext;
struct extent *pmemext;
pci_chipset_tag_t pc;
struct _s_pciconf_bus_t *parent_bus;
} pciconf_bus_t;
static int probe_bus(pciconf_bus_t *);
static void alloc_busno(pciconf_bus_t *, pciconf_bus_t *);
static int pci_do_device_query(pciconf_bus_t *, pcitag_t, int, int, int);
static int setup_iowins(pciconf_bus_t *);
static int setup_memwins(pciconf_bus_t *);
static int configure_bridge(pciconf_dev_t *);
static int configure_bus(pciconf_bus_t *);
static u_int64_t pci_allocate_range(struct extent *, u_int64_t, int);
static pciconf_win_t *get_io_desc(pciconf_bus_t *, bus_size_t);
static pciconf_win_t *get_mem_desc(pciconf_bus_t *, bus_size_t);
static pciconf_bus_t *query_bus(pciconf_bus_t *, pciconf_dev_t *, int);
static void print_tag(pci_chipset_tag_t, pcitag_t);
static void
print_tag(pci_chipset_tag_t pc, pcitag_t tag)
{
int bus, dev, func;
pci_decompose_tag(pc, tag, &bus, &dev, &func);
printf("PCI: bus %d, device %d, function %d: ", bus, dev, func);
}
/************************************************************************/
/************************************************************************/
/*********************** Bus probing routines ***********************/
/************************************************************************/
/************************************************************************/
static pciconf_win_t *
get_io_desc(pciconf_bus_t *pb, bus_size_t size)
{
int i, n;
n = pb->niowin;
for (i=n; i > 0 && size > pb->pciiowin[i-1].size; i--)
pb->pciiowin[i] = pb->pciiowin[i-1]; /* struct copy */
return &pb->pciiowin[i];
}
static pciconf_win_t *
get_mem_desc(pciconf_bus_t *pb, bus_size_t size)
{
int i, n;
n = pb->nmemwin;
for (i=n; i > 0 && size > pb->pcimemwin[i-1].size; i--)
pb->pcimemwin[i] = pb->pcimemwin[i-1]; /* struct copy */
return &pb->pcimemwin[i];
}
/*
* Set up bus common stuff, then loop over devices & functions.
* If we find something, call pci_do_device_query()).
*/
static int
probe_bus(pciconf_bus_t *pb)
{
int device, maxdevs;
#ifdef __PCI_BUS_DEVORDER
char devs[32];
int i;
#endif
maxdevs = pci_bus_maxdevs(pb->pc, pb->busno);
pb->ndevs = 0;
pb->niowin = 0;
pb->nmemwin = 0;
pb->freq_66 = 1;
pb->fast_b2b = 1;
pb->prefetch = 1;
pb->max_mingnt = 0; /* we are looking for the maximum */
pb->min_maxlat = 0x100; /* we are looking for the minimum */
pb->bandwidth_used = 0;
#ifdef __PCI_BUS_DEVORDER
pci_bus_devorder(pb->pc, pb->busno, devs);
for (i=0; (device=devs[i]) < 32 && device >= 0; i++) {
#else
for (device=0; device < maxdevs; device++) {
#endif
pcitag_t tag;
pcireg_t id, bhlcr;
int function, nfunction;
int confmode;
tag = pci_make_tag(pb->pc, pb->busno, device, 0);
if (pci_conf_debug) {
print_tag(pb->pc, tag);
}
id = pci_conf_read(pb->pc, tag, PCI_ID_REG);
if (pci_conf_debug) {
printf("id=%x: Vendor=%x, Product=%x\n",
id, PCI_VENDOR(id),PCI_PRODUCT(id));
}
/* Invalid vendor ID value? */
if (PCI_VENDOR(id) == PCI_VENDOR_INVALID)
continue;
bhlcr = pci_conf_read(pb->pc, tag, PCI_BHLC_REG);
nfunction = PCI_HDRTYPE_MULTIFN(bhlcr) ? 8 : 1;
for (function = 0 ; function < nfunction ; function++) {
tag = pci_make_tag(pb->pc, pb->busno, device, function);
id = pci_conf_read(pb->pc, tag, PCI_ID_REG);
if (PCI_VENDOR(id) == PCI_VENDOR_INVALID)
continue;
if (pb->ndevs+1 < MAX_CONF_DEV) {
if (pci_conf_debug) {
print_tag(pb->pc, tag);
printf("Found dev 0x%04x 0x%04x -- "
"really probing.\n",
PCI_VENDOR(id), PCI_PRODUCT(id));
}
#ifdef __HAVE_PCI_CONF_HOOK
confmode = pci_conf_hook(pb->pc, pb->busno,
device, function, id);
if (confmode == 0)
continue;
#else
/*
* Don't enable expansion ROMS -- some cards
* share address decoders between the EXPROM
* and PCI memory space, and enabling the ROM
* when not needed will cause all sorts of
* lossage.
*/
confmode = PCI_CONF_ALL & ~PCI_CONF_MAP_ROM;
#endif
if (pci_do_device_query(pb, tag, device,
function, confmode))
return -1;
pb->ndevs++;
}
}
}
return 0;
}
static void
alloc_busno(pciconf_bus_t *parent, pciconf_bus_t *pb)
{
pb->busno = parent->next_busno;
if (parent->next_busno + parent->busno_spacing > parent->last_busno)
panic("Too many PCI busses on bus %d", parent->busno);
parent->next_busno = parent->next_busno + parent->busno_spacing;
pb->next_busno = pb->busno+1;
pb->busno_spacing = parent->busno_spacing >> 1;
if (!pb->busno_spacing)
panic("PCI busses nested too deep.");
pb->last_busno = parent->next_busno - 1;
}
static pciconf_bus_t *
query_bus(pciconf_bus_t *parent, pciconf_dev_t *pd, int dev)
{
pciconf_bus_t *pb;
pcireg_t busreg, io, pmem;
pciconf_win_t *pi, *pm;
pb = malloc (sizeof (pciconf_bus_t), M_DEVBUF, M_NOWAIT);
if (!pb)
panic("Unable to allocate memory for PCI configuration.");
pb->cacheline_size = parent->cacheline_size;
pb->parent_bus = parent;
alloc_busno(parent, pb);
if (pci_conf_debug)
printf("PCI bus bridge covers busses %d-%d\n",
pb->busno, pb->last_busno);
busreg = parent->busno << PCI_BRIDGE_BUS_PRIMARY_SHIFT;
busreg |= pb->busno << PCI_BRIDGE_BUS_SECONDARY_SHIFT;
busreg |= pb->last_busno << PCI_BRIDGE_BUS_SUBORDINATE_SHIFT;
pci_conf_write(parent->pc, pd->tag, PCI_BRIDGE_BUS_REG, busreg);
pb->swiz = parent->swiz + dev;
pb->ioext = NULL;
pb->memext = NULL;
pb->pmemext = NULL;
pb->pc = parent->pc;
pb->io_total = pb->mem_total = pb->pmem_total = 0;
pb->io_32bit = 0;
if (parent->io_32bit) {
io = pci_conf_read(parent->pc, pd->tag, PCI_BRIDGE_STATIO_REG);
if (PCI_BRIDGE_IO_32BITS(io)) {
pb->io_32bit = 1;
}
}
pb->pmem_64bit = 0;
if (parent->pmem_64bit) {
pmem = pci_conf_read(parent->pc, pd->tag,
PCI_BRIDGE_PREFETCHMEM_REG);
if (PCI_BRIDGE_PREFETCHMEM_64BITS(pmem)) {
pb->pmem_64bit = 1;
}
}
if (probe_bus(pb)) {
printf("Failed to probe bus %d\n", pb->busno);
goto err;
}
if (pb->io_total > 0) {
if (parent->niowin >= MAX_CONF_IO) {
printf("pciconf: too many I/O windows\n");
goto err;
}
pb->io_total |= 0xfff; /* Round up */
pi = get_io_desc(parent, pb->io_total);
pi->dev = pd;
pi->reg = 0;
pi->size = pb->io_total;
pi->align = 0x1000; /* 4K alignment */
pi->prefetch = 0;
parent->niowin++;
parent->io_total += pb->io_total;
}
if (pb->mem_total > 0) {
if (parent->nmemwin >= MAX_CONF_MEM) {
printf("pciconf: too many MEM windows\n");
goto err;
}
pb->mem_total |= 0xfffff; /* Round up */
pm = get_mem_desc(parent, pb->mem_total);
pm->dev = pd;
pm->reg = 0;
pm->size = pb->mem_total;
pm->align = 0x100000; /* 1M alignment */
pm->prefetch = 0;
parent->nmemwin++;
parent->mem_total += pb->mem_total;
}
if (pb->pmem_total > 0) {
if (parent->nmemwin >= MAX_CONF_MEM) {
printf("pciconf: too many MEM windows\n");
goto err;
}
pb->pmem_total |= 0xfffff; /* Round up */
pm = get_mem_desc(parent, pb->pmem_total);
pm->dev = pd;
pm->reg = 0;
pm->size = pb->pmem_total;
pm->align = 0x100000; /* 1M alignment */
pm->prefetch = 1;
parent->nmemwin++;
parent->pmem_total += pb->pmem_total;
}
return pb;
err:
free(pb, M_DEVBUF);
return NULL;
}
static int
pci_do_device_query(pciconf_bus_t *pb, pcitag_t tag, int dev, int func, int mode)
{
pciconf_dev_t *pd;
pciconf_win_t *pi, *pm;
pcireg_t class, cmd, icr, bar, mask, bar64, mask64;
u_int64_t size;
int br, width;
pd = &pb->device[pb->ndevs];
pd->pc = pb->pc;
pd->tag = tag;
pd->ppb = NULL;
pd->enable = mode;
class = pci_conf_read(pb->pc, tag, PCI_CLASS_REG);
cmd = pci_conf_read(pb->pc, tag, PCI_COMMAND_STATUS_REG);
if (PCI_CLASS(class) != PCI_CLASS_BRIDGE) {
cmd &= ~(PCI_COMMAND_MASTER_ENABLE |
PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE);
pci_conf_write(pb->pc, tag, PCI_COMMAND_STATUS_REG, cmd);
} else if (pci_conf_debug) {
print_tag(pb->pc, tag);
printf("device is a bridge; not clearing enables\n");
}
if ((cmd & PCI_STATUS_BACKTOBACK_SUPPORT) == 0)
pb->fast_b2b = 0;
if ((cmd & PCI_STATUS_66MHZ_SUPPORT) == 0)
pb->freq_66 = 0;
if ( (PCI_CLASS(class) == PCI_CLASS_BRIDGE)
&& (PCI_SUBCLASS(class) == PCI_SUBCLASS_BRIDGE_PCI)) {
pd->ppb = query_bus(pb, pd, dev);
if (pd->ppb == NULL)
return -1;
return 0;
}
icr = pci_conf_read(pb->pc, tag, PCI_INTERRUPT_REG);
pd->ipin = PCI_INTERRUPT_PIN(icr);
pd->iline = PCI_INTERRUPT_LINE(icr);
pd->min_gnt = PCI_MIN_GNT(icr);
pd->max_lat = PCI_MAX_LAT(icr);
if (pd->iline || pd->ipin) {
pci_conf_interrupt(pb->pc, pb->busno, dev, pd->ipin, pb->swiz,
&pd->iline);
icr &= ~(PCI_INTERRUPT_LINE_MASK << PCI_INTERRUPT_LINE_SHIFT);
icr |= (pd->iline << PCI_INTERRUPT_LINE_SHIFT);
pci_conf_write(pb->pc, tag, PCI_INTERRUPT_REG, icr);
}
if (pd->min_gnt != 0 || pd->max_lat != 0) {
if (pd->min_gnt != 0 && pd->min_gnt > pb->max_mingnt)
pb->max_mingnt = pd->min_gnt;
if (pd->max_lat != 0 && pd->max_lat < pb->min_maxlat)
pb->min_maxlat = pd->max_lat;
pb->bandwidth_used += pd->min_gnt * 4000000 /
(pd->min_gnt + pd->max_lat);
}
width = 4;
for (br = PCI_MAPREG_START; br < PCI_MAPREG_END; br += width) {
#if 0
/* XXX Should only ignore if IDE not in legacy mode? */
if (PCI_CLASS(class) == PCI_CLASS_MASS_STORAGE &&
PCI_SUBCLASS(class) == PCI_SUBCLASS_MASS_STORAGE_IDE) {
break;
}
#endif
bar = pci_conf_read(pb->pc, tag, br);
pci_conf_write(pb->pc, tag, br, 0xffffffff);
mask = pci_conf_read(pb->pc, tag, br);
pci_conf_write(pb->pc, tag, br, bar);
width = 4;
if ( (mode & PCI_CONF_MAP_IO)
&& (PCI_MAPREG_TYPE(mask) == PCI_MAPREG_TYPE_IO)) {
/*
* Upper 16 bits must be one. Devices may hardwire
* them to zero, though, per PCI 2.2, 6.2.5.1, p 203.
*/
mask |= 0xffff0000;
size = PCI_MAPREG_IO_SIZE(mask);
if (size == 0) {
if (pci_conf_debug) {
print_tag(pb->pc, tag);
printf("I/O BAR 0x%x is void\n", br);
}
continue;
}
if (pb->niowin >= MAX_CONF_IO) {
printf("pciconf: too many I/O windows\n");
return -1;
}
pi = get_io_desc(pb, size);
pi->dev = pd;
pi->reg = br;
pi->size = (u_int64_t) size;
pi->align = 4;
pi->prefetch = 0;
if (pci_conf_debug) {
print_tag(pb->pc, tag);
printf("Register 0x%x, I/O size %llu\n",
br, pi->size);
}
pb->niowin++;
pb->io_total += size;
} else if ((mode & PCI_CONF_MAP_MEM)
&& (PCI_MAPREG_TYPE(mask) == PCI_MAPREG_TYPE_MEM)) {
switch (PCI_MAPREG_MEM_TYPE(mask)) {
case PCI_MAPREG_MEM_TYPE_32BIT:
case PCI_MAPREG_MEM_TYPE_32BIT_1M:
size = (u_int64_t) PCI_MAPREG_MEM_SIZE(mask);
break;
case PCI_MAPREG_MEM_TYPE_64BIT:
bar64 = pci_conf_read(pb->pc, tag, br + 4);
pci_conf_write(pb->pc, tag, br + 4, 0xffffffff);
mask64 = pci_conf_read(pb->pc, tag, br + 4);
pci_conf_write(pb->pc, tag, br + 4, bar64);
size = (u_int64_t) PCI_MAPREG_MEM64_SIZE(
(((u_int64_t) mask64) << 32) | mask);
width = 8;
continue;
default:
print_tag(pb->pc, tag);
printf("reserved mapping type 0x%x\n",
PCI_MAPREG_MEM_TYPE(mask));
continue;
}
if (size == 0) {
if (pci_conf_debug) {
print_tag(pb->pc, tag);
printf("MEM%d BAR 0x%x is void\n",
PCI_MAPREG_MEM_TYPE(mask) ==
PCI_MAPREG_MEM_TYPE_64BIT ?
64 : 32, br);
}
continue;
}
if (pb->nmemwin >= MAX_CONF_MEM) {
printf("pciconf: too many memory windows\n");
return -1;
}
pm = get_mem_desc(pb, size);
pm->dev = pd;
pm->reg = br;
pm->size = size;
pm->align = 4;
pm->prefetch = PCI_MAPREG_MEM_PREFETCHABLE(mask);
if (pci_conf_debug) {
print_tag(pb->pc, tag);
printf("Register 0x%x, memory size %llu\n",
br, pm->size);
}
pb->nmemwin++;
if (pm->prefetch) {
pb->pmem_total += size;
} else {
pb->mem_total += size;
}
}
}
if (mode & PCI_CONF_MAP_ROM) {
bar = pci_conf_read(pb->pc, tag, PCI_MAPREG_ROM);
pci_conf_write(pb->pc, tag, PCI_MAPREG_ROM, 0xfffffffe);
mask = pci_conf_read(pb->pc, tag, PCI_MAPREG_ROM);
pci_conf_write(pb->pc, tag, PCI_MAPREG_ROM, bar);
if (mask != 0 && mask != 0xffffffff) {
if (pb->nmemwin >= MAX_CONF_MEM) {
printf("pciconf: too many memory windows\n");
return -1;
}
size = (u_int64_t) PCI_MAPREG_MEM_SIZE(mask);
pm = get_mem_desc(pb, size);
pm->dev = pd;
pm->reg = PCI_MAPREG_ROM;
pm->size = size;
pm->align = 4;
pm->prefetch = 1;
if (pci_conf_debug) {
print_tag(pb->pc, tag);
printf("Expansion ROM memory size %llu\n", pm->size);
}
pb->nmemwin++;
pb->pmem_total += size;
}
} else {
/* Ensure ROM is disabled */
bar = pci_conf_read(pb->pc, tag, PCI_MAPREG_ROM);
pci_conf_write(pb->pc, tag, PCI_MAPREG_ROM, 0xfffffffe);
mask = pci_conf_read(pb->pc, tag, PCI_MAPREG_ROM);
pci_conf_write(pb->pc, tag, PCI_MAPREG_ROM,
bar & ~PCI_MAPREG_ROM_ENABLE);
}
return 0;
}
/************************************************************************/
/************************************************************************/
/******************** Bus configuration routines ********************/
/************************************************************************/
/************************************************************************/
static u_int64_t
pci_allocate_range(struct extent *ex, u_int64_t amt, int align)
{
int r;
u_long addr;
r = extent_alloc(ex, amt, align, 0, EX_NOWAIT, &addr);
if (r) {
addr = (u_long) -1;
printf("extent_alloc(%p, %llu, %d) returned %d\n",
ex, amt, align, r);
extent_print(ex);
}
return (pcireg_t) addr;
}
static int
setup_iowins(pciconf_bus_t *pb)
{
pciconf_win_t *pi;
pciconf_dev_t *pd;
for (pi=pb->pciiowin; pi < &pb->pciiowin[pb->niowin] ; pi++) {
if (pi->size == 0)
continue;
pd = pi->dev;
pi->address = pci_allocate_range(pb->ioext, pi->size,
pi->align);
if (pi->address == -1) {
print_tag(pd->pc, pd->tag);
printf("Failed to allocate PCI I/O space (%llu req)\n",
pi->size);
return -1;
}
if (!pb->io_32bit && pi->address > 0xFFFF) {
pi->address = 0;
pd->enable = 0;
}
if (pd->ppb && pi->reg == 0) {
pd->ppb->ioext = extent_create("pciconf", pi->address,
pi->address + pi->size, M_DEVBUF, NULL, 0,
EX_NOWAIT);
if (pd->ppb->ioext == NULL) {
print_tag(pd->pc, pd->tag);
printf("Failed to alloc I/O ext. for bus %d\n",
pd->ppb->busno);
return -1;
}
continue;
}
pd->enable |= PCI_CONF_ENABLE_IO;
if (pci_conf_debug) {
print_tag(pd->pc, pd->tag);
printf("Putting %llu I/O bytes @ %#llx (reg %x)\n",
pi->size, pi->address, pi->reg);
}
pci_conf_write(pd->pc, pd->tag, pi->reg,
PCI_MAPREG_IO_ADDR(pi->address) | PCI_MAPREG_TYPE_IO);
}
return 0;
}
static int
setup_memwins(pciconf_bus_t *pb)
{
pciconf_win_t *pm;
pciconf_dev_t *pd;
pcireg_t base;
struct extent *ex;
for (pm=pb->pcimemwin; pm < &pb->pcimemwin[pb->nmemwin] ; pm++) {
if (pm->size == 0)
continue;
pd = pm->dev;
ex = (pm->prefetch) ? pb->pmemext : pb->memext;
pm->address = pci_allocate_range(ex, pm->size, pm->align);
if (pm->address == -1) {
print_tag(pd->pc, pd->tag);
printf(
"Failed to allocate PCI memory space (%llu req)\n",
pm->size);
return -1;
}
if (pd->ppb && pm->reg == 0) {
ex = extent_create("pciconf", pm->address,
pm->address + pm->size, M_DEVBUF, NULL, 0,
EX_NOWAIT);
if (ex == NULL) {
print_tag(pd->pc, pd->tag);
printf("Failed to alloc MEM ext. for bus %d\n",
pd->ppb->busno);
return -1;
}
if (pm->prefetch) {
pd->ppb->pmemext = ex;
} else {
pd->ppb->memext = ex;
}
continue;
}
if (pm->prefetch && !pb->pmem_64bit &&
pm->address > 0xFFFFFFFFULL) {
pm->address = 0;
pd->enable = 0;
} else {
pd->enable |= PCI_CONF_ENABLE_MEM;
}
if (pm->reg != PCI_MAPREG_ROM) {
if (pci_conf_debug) {
print_tag(pd->pc, pd->tag);
printf(
"Putting %llu MEM bytes @ %#llx (reg %x)\n",
pm->size, pm->address, pm->reg);
}
base = pci_conf_read(pd->pc, pd->tag, pm->reg);
base = PCI_MAPREG_MEM_ADDR(pm->address) |
PCI_MAPREG_MEM_TYPE(base);
pci_conf_write(pd->pc, pd->tag, pm->reg, base);
if (PCI_MAPREG_MEM_TYPE(base) ==
PCI_MAPREG_MEM_TYPE_64BIT) {
base = (pcireg_t)
(PCI_MAPREG_MEM64_ADDR(pm->address) >> 32);
pci_conf_write(pd->pc, pd->tag, pm->reg + 4,
base);
}
}
}
for (pm=pb->pcimemwin; pm < &pb->pcimemwin[pb->nmemwin] ; pm++) {
if (pm->reg == PCI_MAPREG_ROM && pm->address != -1) {
pd = pm->dev;
if (pci_conf_debug) {
print_tag(pd->pc, pd->tag);
printf(
"Putting %llu ROM bytes @ %#llx (reg %x)\n",
pm->size, pm->address, pm->reg);
}
base = (pcireg_t) (pm->address | PCI_MAPREG_ROM_ENABLE);
pci_conf_write(pd->pc, pd->tag, pm->reg, base);
}
}
return 0;
}
/*
* Configure I/O, memory, and prefetcable memory spaces, then make
* a call to configure_bus().
*/
static int
configure_bridge(pciconf_dev_t *pd)
{
unsigned long io_base, io_limit, mem_base, mem_limit;
pciconf_bus_t *pb;
pcireg_t io, iohigh, mem, cmd;
int rv;
pb = pd->ppb;
/* Configure I/O base & limit*/
if (pb->ioext) {
io_base = pb->ioext->ex_start;
io_limit = pb->ioext->ex_end;
} else {
io_base = 0x1000; /* 4K */
io_limit = 0x0000;
}
if (pb->io_32bit) {
iohigh =
((io_base >> 16) << PCI_BRIDGE_IOHIGH_BASE_SHIFT) |
((io_limit >> 16) << PCI_BRIDGE_IOHIGH_LIMIT_SHIFT);
} else {
if (io_limit > 0xFFFF) {
printf("Bus %d bridge does not support 32-bit I/O. ",
pb->busno);
printf("Disabling I/O accesses\n");
io_base = 0x1000; /* 4K */
io_limit = 0x0000;
}
iohigh = 0;
}
io = pci_conf_read(pb->pc, pd->tag, PCI_BRIDGE_STATIO_REG) &
(PCI_BRIDGE_STATIO_STATUS_MASK << PCI_BRIDGE_STATIO_STATUS_SHIFT);
io |= (((io_base >> 8) & PCI_BRIDGE_STATIO_IOBASE_MASK)
<< PCI_BRIDGE_STATIO_IOBASE_SHIFT);
io |= (((io_limit >> 8) & PCI_BRIDGE_STATIO_IOLIMIT_MASK)
<< PCI_BRIDGE_STATIO_IOLIMIT_SHIFT);
pci_conf_write(pb->pc, pd->tag, PCI_BRIDGE_STATIO_REG, io);
pci_conf_write(pb->pc, pd->tag, PCI_BRIDGE_IOHIGH_REG, iohigh);
/* Configure mem base & limit */
if (pb->memext) {
mem_base = pb->memext->ex_start;
mem_limit = pb->memext->ex_end;
} else {
mem_base = 0x100000; /* 1M */
mem_limit = 0x000000;
}
if (mem_limit > 0xFFFFFFFFULL) {
printf("Bus %d bridge MEM range out of range. ", pb->busno);
printf("Disabling MEM accesses\n");
mem_base = 0x100000; /* 1M */
mem_limit = 0x000000;
}
mem = (((mem_base >> 20) & PCI_BRIDGE_MEMORY_BASE_MASK)
<< PCI_BRIDGE_MEMORY_BASE_SHIFT);
mem |= (((mem_limit >> 20) & PCI_BRIDGE_MEMORY_LIMIT_MASK)
<< PCI_BRIDGE_MEMORY_LIMIT_SHIFT);
pci_conf_write(pb->pc, pd->tag, PCI_BRIDGE_MEMORY_REG, mem);
/* Configure prefetchable mem base & limit */
if (pb->pmemext) {
mem_base = pb->pmemext->ex_start;
mem_limit = pb->pmemext->ex_end;
} else {
mem_base = 0x100000; /* 1M */
mem_limit = 0x000000;
}
mem = pci_conf_read(pb->pc, pd->tag, PCI_BRIDGE_PREFETCHMEM_REG);
if (!PCI_BRIDGE_PREFETCHMEM_64BITS(mem) && mem_limit > 0xFFFFFFFFULL) {
printf("Bus %d bridge does not support 64-bit PMEM. ",
pb->busno);
printf("Disabling prefetchable-MEM accesses\n");
mem_base = 0x100000; /* 1M */
mem_limit = 0x000000;
}
mem = (((mem_base >> 20) & PCI_BRIDGE_PREFETCHMEM_BASE_MASK)
<< PCI_BRIDGE_PREFETCHMEM_BASE_SHIFT);
mem |= (((mem_limit >> 20) & PCI_BRIDGE_PREFETCHMEM_LIMIT_MASK)
<< PCI_BRIDGE_PREFETCHMEM_LIMIT_SHIFT);
pci_conf_write(pb->pc, pd->tag, PCI_BRIDGE_PREFETCHMEM_REG, mem);
/*
* XXX -- 64-bit systems need a lot more than just this...
*/
if (sizeof(u_long) > 4) {
mem_base = (int64_t) mem_base >> 32;
mem_limit = (int64_t) mem_limit >> 32;
}
pci_conf_write(pb->pc, pd->tag, PCI_BRIDGE_PREFETCHBASE32_REG,
mem_base & 0xffffffff);
pci_conf_write(pb->pc, pd->tag, PCI_BRIDGE_PREFETCHLIMIT32_REG,
mem_limit & 0xffffffff);
rv = configure_bus(pb);
if (pb->ioext)
extent_destroy(pb->ioext);
if (pb->memext)
extent_destroy(pb->memext);
if (pb->pmemext)
extent_destroy(pb->pmemext);
if (rv == 0) {
cmd = pci_conf_read(pd->pc, pd->tag, PCI_BRIDGE_CONTROL_REG);
cmd &= PCI_BRIDGE_CONTROL_MASK;
cmd |= (PCI_BRIDGE_CONTROL_PERE | PCI_BRIDGE_CONTROL_SERR)
<< PCI_BRIDGE_CONTROL_SHIFT;
if (pb->fast_b2b) {
cmd |= PCI_BRIDGE_CONTROL_SECFASTB2B
<< PCI_BRIDGE_CONTROL_SHIFT;
}
pci_conf_write(pd->pc, pd->tag, PCI_BRIDGE_CONTROL_REG, cmd);
cmd = pci_conf_read(pd->pc, pd->tag, PCI_COMMAND_STATUS_REG);
cmd |= PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE;
pci_conf_write(pd->pc, pd->tag, PCI_COMMAND_STATUS_REG, cmd);
}
return rv;
}
/*
* Calculate latency values, allocate I/O and MEM segments, then set them
* up. If a PCI-PCI bridge is found, configure the bridge separately,
* which will cause a recursive call back here.
*/
static int
configure_bus(pciconf_bus_t *pb)
{
pciconf_dev_t *pd;
int def_ltim, max_ltim, band, bus_mhz;
bus_mhz = pb->freq_66 ? 66 : 33;
max_ltim = pb->max_mingnt * bus_mhz / 4; /* cvt to cycle count */
band = 40000000; /* 0.25us cycles/sec */
if (band < pb->bandwidth_used) {
printf("PCI bus %d: Warning: Total bandwidth exceeded!?\n",
pb->busno);
def_ltim = -1;
} else {
def_ltim = (band - pb->bandwidth_used) / pb->ndevs;
if (def_ltim > pb->min_maxlat)
def_ltim = pb->min_maxlat;
def_ltim = def_ltim * bus_mhz / 4;
}
def_ltim = (def_ltim + 7) & ~7;
max_ltim = (max_ltim + 7) & ~7;
pb->def_ltim = MIN( def_ltim, 255 );
pb->max_ltim = MIN( MAX(max_ltim, def_ltim ), 255 );
/*
* Now we have what we need to initialize the devices.
* It would probably be better if we could allocate all of these
* for all busses at once, but "not right now". First, get a list
* of free memory ranges from the m.d. system.
*/
if (setup_iowins(pb) || setup_memwins(pb)) {
printf("PCI bus configuration failed: ");
printf("unable to assign all I/O and memory ranges.");
return -1;
}
/*
* Configure the latency for the devices, and enable them.
*/
for (pd=pb->device ; pd < &pb->device[pb->ndevs] ; pd++) {
pcireg_t cmd, class, misc;
int ltim;
if (pci_conf_debug) {
print_tag(pd->pc, pd->tag);
printf("Configuring device.\n");
}
class = pci_conf_read(pd->pc, pd->tag, PCI_CLASS_REG);
misc = pci_conf_read(pd->pc, pd->tag, PCI_BHLC_REG);
cmd = pci_conf_read(pd->pc, pd->tag, PCI_COMMAND_STATUS_REG);
cmd |= PCI_COMMAND_SERR_ENABLE | PCI_COMMAND_PARITY_ENABLE;
if (pb->fast_b2b)
cmd |= PCI_COMMAND_BACKTOBACK_ENABLE;
if (PCI_CLASS(class) != PCI_CLASS_BRIDGE ||
PCI_SUBCLASS(class) != PCI_SUBCLASS_BRIDGE_PCI) {
if (pd->enable & PCI_CONF_ENABLE_IO)
cmd |= PCI_COMMAND_IO_ENABLE;
if (pd->enable & PCI_CONF_ENABLE_MEM)
cmd |= PCI_COMMAND_MEM_ENABLE;
if (pd->enable & PCI_CONF_ENABLE_BM)
cmd |= PCI_COMMAND_MASTER_ENABLE;
ltim = pd->min_gnt * bus_mhz / 4;
ltim = MIN (MAX (pb->def_ltim, ltim), pb->max_ltim);
} else {
cmd |= PCI_COMMAND_MASTER_ENABLE;
ltim = MIN (pb->def_ltim, pb->max_ltim);
}
if (!(pd->enable)) {
print_tag(pd->pc, pd->tag);
printf("Disabled due to lack of resources.\n");
cmd &= ~(PCI_COMMAND_MASTER_ENABLE |
PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE);
}
pci_conf_write(pd->pc, pd->tag, PCI_COMMAND_STATUS_REG, cmd);
misc &= ~((PCI_LATTIMER_MASK << PCI_LATTIMER_SHIFT) |
(PCI_CACHELINE_MASK << PCI_CACHELINE_SHIFT));
misc |= (ltim & PCI_LATTIMER_MASK) << PCI_LATTIMER_SHIFT;
misc |= (pb->cacheline_size & PCI_CACHELINE_MASK) <<
PCI_CACHELINE_SHIFT;
pci_conf_write(pd->pc, pd->tag, PCI_BHLC_REG, misc);
if (pd->ppb) {
if (configure_bridge(pd) < 0)
return -1;
continue;
}
}
if (pci_conf_debug) {
printf("PCI bus %d configured\n", pb->busno);
}
return 0;
}
/*
* Let's configure the PCI bus.
* This consists of basically scanning for all existing devices,
* identifying their needs, and then making another pass over them
* to set:
* 1. I/O addresses
* 2. Memory addresses (Prefetchable and not)
* 3. PCI command register
* 4. The latency part of the PCI BHLC (BIST (Built-In Self Test),
* Header type, Latency timer, Cache line size) register
*
* The command register is set to enable fast back-to-back transactions
* if the host bridge says it can handle it. We also configure
* Master Enable, SERR enable, parity enable, and (if this is not a
* PCI-PCI bridge) the I/O and Memory spaces. Apparently some devices
* will not report some I/O space.
*
* The latency is computed to be a "fair share" of the bus bandwidth.
* The bus bandwidth variable is initialized to the number of PCI cycles
* in one second. The number of cycles taken for one transaction by each
* device (MAX_LAT + MIN_GNT) is then subtracted from the bandwidth.
* Care is taken to ensure that the latency timer won't be set such that
* it would exceed the critical time for any device.
*
* This is complicated somewhat due to the presence of bridges. PCI-PCI
* bridges are probed and configured recursively.
*/
int
pci_configure_bus(pci_chipset_tag_t pc, struct extent *ioext,
struct extent *memext, struct extent *pmemext, int firstbus,
int cacheline_size)
{
pciconf_bus_t *pb;
int rv;
pb = malloc (sizeof (pciconf_bus_t), M_DEVBUF, M_NOWAIT);
pb->busno = firstbus;
pb->busno_spacing = PCI_BUSNO_SPACING;
pb->next_busno = pb->busno + 1;
pb->last_busno = 255;
pb->cacheline_size = cacheline_size;
pb->parent_bus = NULL;
pb->swiz = 0;
pb->io_32bit = 1;
pb->pmem_64bit = 0;
pb->ioext = ioext;
pb->memext = memext;
if (pmemext == NULL) {
pb->pmemext = memext;
} else {
pb->pmemext = pmemext;
}
pb->pc = pc;
pb->io_total = pb->mem_total = pb->pmem_total = 0;
rv = probe_bus(pb);
if (rv == 0) {
rv = configure_bus(pb);
}
/*
* All done!
*/
free(pb, M_DEVBUF);
return rv;
}
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