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| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/cas/@/dev/pci/pci_subr.c |
/*-
* Copyright (c) 2011 Advanced Computing Technologies LLC
* Written by: John H. Baldwin <jhb@FreeBSD.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/pci/pci_subr.c 224069 2011-07-15 21:08:58Z jhb $");
/*
* Support APIs for Host to PCI bridge drivers and drivers that
* provide PCI domains.
*/
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/systm.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcib_private.h>
/*
* Try to read the bus number of a host-PCI bridge using appropriate config
* registers.
*/
int
host_pcib_get_busno(pci_read_config_fn read_config, int bus, int slot, int func,
uint8_t *busnum)
{
uint32_t id;
id = read_config(bus, slot, func, PCIR_DEVVENDOR, 4);
if (id == 0xffffffff)
return (0);
switch (id) {
case 0x12258086:
/* Intel 824?? */
/* XXX This is a guess */
/* *busnum = read_config(bus, slot, func, 0x41, 1); */
*busnum = bus;
break;
case 0x84c48086:
/* Intel 82454KX/GX (Orion) */
*busnum = read_config(bus, slot, func, 0x4a, 1);
break;
case 0x84ca8086:
/*
* For the 450nx chipset, there is a whole bundle of
* things pretending to be host bridges. The MIOC will
* be seen first and isn't really a pci bridge (the
* actual busses are attached to the PXB's). We need to
* read the registers of the MIOC to figure out the
* bus numbers for the PXB channels.
*
* Since the MIOC doesn't have a pci bus attached, we
* pretend it wasn't there.
*/
return (0);
case 0x84cb8086:
switch (slot) {
case 0x12:
/* Intel 82454NX PXB#0, Bus#A */
*busnum = read_config(bus, 0x10, func, 0xd0, 1);
break;
case 0x13:
/* Intel 82454NX PXB#0, Bus#B */
*busnum = read_config(bus, 0x10, func, 0xd1, 1) + 1;
break;
case 0x14:
/* Intel 82454NX PXB#1, Bus#A */
*busnum = read_config(bus, 0x10, func, 0xd3, 1);
break;
case 0x15:
/* Intel 82454NX PXB#1, Bus#B */
*busnum = read_config(bus, 0x10, func, 0xd4, 1) + 1;
break;
}
break;
/* ServerWorks -- vendor 0x1166 */
case 0x00051166:
case 0x00061166:
case 0x00081166:
case 0x00091166:
case 0x00101166:
case 0x00111166:
case 0x00171166:
case 0x01011166:
case 0x010f1014:
case 0x01101166:
case 0x02011166:
case 0x02251166:
case 0x03021014:
*busnum = read_config(bus, slot, func, 0x44, 1);
break;
/* Compaq/HP -- vendor 0x0e11 */
case 0x60100e11:
*busnum = read_config(bus, slot, func, 0xc8, 1);
break;
default:
/* Don't know how to read bus number. */
return 0;
}
return 1;
}
#ifdef NEW_PCIB
/*
* Return a pointer to a pretty name for a PCI device. If the device
* has a driver attached, the device's name is used, otherwise a name
* is generated from the device's PCI address.
*/
const char *
pcib_child_name(device_t child)
{
static char buf[64];
if (device_get_nameunit(child) != NULL)
return (device_get_nameunit(child));
snprintf(buf, sizeof(buf), "pci%d:%d:%d:%d", pci_get_domain(child),
pci_get_bus(child), pci_get_slot(child), pci_get_function(child));
return (buf);
}
/*
* Some Host-PCI bridge drivers know which resource ranges they can
* decode and should only allocate subranges to child PCI devices.
* This API provides a way to manage this. The bridge drive should
* initialize this structure during attach and call
* pcib_host_res_decodes() on each resource range it decodes. It can
* then use pcib_host_res_alloc() and pcib_host_res_adjust() as helper
* routines for BUS_ALLOC_RESOURCE() and BUS_ADJUST_RESOURCE(). This
* API assumes that resources for any decoded ranges can be safely
* allocated from the parent via bus_generic_alloc_resource().
*/
int
pcib_host_res_init(device_t pcib, struct pcib_host_resources *hr)
{
hr->hr_pcib = pcib;
resource_list_init(&hr->hr_rl);
return (0);
}
int
pcib_host_res_free(device_t pcib, struct pcib_host_resources *hr)
{
resource_list_free(&hr->hr_rl);
return (0);
}
int
pcib_host_res_decodes(struct pcib_host_resources *hr, int type, u_long start,
u_long end, u_int flags)
{
struct resource_list_entry *rle;
int rid;
if (bootverbose)
device_printf(hr->hr_pcib, "decoding %d %srange %#lx-%#lx\n",
type, flags & RF_PREFETCHABLE ? "prefetchable ": "", start,
end);
rid = resource_list_add_next(&hr->hr_rl, type, start, end,
end - start + 1);
if (flags & RF_PREFETCHABLE) {
KASSERT(type == SYS_RES_MEMORY,
("only memory is prefetchable"));
rle = resource_list_find(&hr->hr_rl, type, rid);
rle->flags = RLE_PREFETCH;
}
return (0);
}
struct resource *
pcib_host_res_alloc(struct pcib_host_resources *hr, device_t dev, int type,
int *rid, u_long start, u_long end, u_long count, u_int flags)
{
struct resource_list_entry *rle;
struct resource *r;
u_long new_start, new_end;
if (flags & RF_PREFETCHABLE)
KASSERT(type == SYS_RES_MEMORY,
("only memory is prefetchable"));
rle = resource_list_find(&hr->hr_rl, type, 0);
if (rle == NULL) {
/*
* No decoding ranges for this resource type, just pass
* the request up to the parent.
*/
return (bus_generic_alloc_resource(hr->hr_pcib, dev, type, rid,
start, end, count, flags));
}
restart:
/* Try to allocate from each decoded range. */
for (; rle != NULL; rle = STAILQ_NEXT(rle, link)) {
if (rle->type != type)
continue;
if (((flags & RF_PREFETCHABLE) != 0) !=
((rle->flags & RLE_PREFETCH) != 0))
continue;
new_start = ulmax(start, rle->start);
new_end = ulmin(end, rle->end);
if (new_start > new_end ||
new_start + count - 1 > new_end ||
new_start + count < new_start)
continue;
r = bus_generic_alloc_resource(hr->hr_pcib, dev, type, rid,
new_start, new_end, count, flags);
if (r != NULL) {
if (bootverbose)
device_printf(hr->hr_pcib,
"allocated type %d (%#lx-%#lx) for rid %x of %s\n",
type, rman_get_start(r), rman_get_end(r),
*rid, pcib_child_name(dev));
return (r);
}
}
/*
* If we failed to find a prefetch range for a memory
* resource, try again without prefetch.
*/
if (flags & RF_PREFETCHABLE) {
flags &= ~RF_PREFETCHABLE;
rle = resource_list_find(&hr->hr_rl, type, 0);
goto restart;
}
return (NULL);
}
int
pcib_host_res_adjust(struct pcib_host_resources *hr, device_t dev, int type,
struct resource *r, u_long start, u_long end)
{
struct resource_list_entry *rle;
rle = resource_list_find(&hr->hr_rl, type, 0);
if (rle == NULL) {
/*
* No decoding ranges for this resource type, just pass
* the request up to the parent.
*/
return (bus_generic_adjust_resource(hr->hr_pcib, dev, type, r,
start, end));
}
/* Only allow adjustments that stay within a decoded range. */
for (; rle != NULL; rle = STAILQ_NEXT(rle, link)) {
if (rle->start <= start && rle->end >= end)
return (bus_generic_adjust_resource(hr->hr_pcib, dev,
type, r, start, end));
}
return (ERANGE);
}
#endif /* NEW_PCIB */