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/*-
* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
* Copyright (c) 2000, Michael Smith <msmith@freebsd.org>
* Copyright (c) 2000, BSDi
* Copyright (c) 2004, Scott Long <scottl@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 unmodified, 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 ``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 <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/i386/pci/pci_cfgreg.c 222531 2011-05-31 15:11:43Z nwhitehorn $");
#include "opt_xbox.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/lock.h>
#include <sys/kernel.h>
#include <sys/mutex.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <machine/pci_cfgreg.h>
#include <machine/pc/bios.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_kern.h>
#include <vm/vm_extern.h>
#include <vm/pmap.h>
#include <machine/pmap.h>
#ifdef XBOX
#include <machine/xbox.h>
#endif
#define PRVERB(a) do { \
if (bootverbose) \
printf a ; \
} while(0)
#define PCIE_CACHE 8
struct pcie_cfg_elem {
TAILQ_ENTRY(pcie_cfg_elem) elem;
vm_offset_t vapage;
vm_paddr_t papage;
};
enum {
CFGMECH_NONE = 0,
CFGMECH_1,
CFGMECH_2,
CFGMECH_PCIE,
};
SYSCTL_DECL(_hw_pci);
static TAILQ_HEAD(pcie_cfg_list, pcie_cfg_elem) pcie_list[MAXCPU];
static uint64_t pcie_base;
static int pcie_minbus, pcie_maxbus;
static uint32_t pcie_badslots;
static int cfgmech;
static int devmax;
static struct mtx pcicfg_mtx;
static int mcfg_enable = 1;
TUNABLE_INT("hw.pci.mcfg", &mcfg_enable);
SYSCTL_INT(_hw_pci, OID_AUTO, mcfg, CTLFLAG_RDTUN, &mcfg_enable, 0,
"Enable support for PCI-e memory mapped config access");
static uint32_t pci_docfgregread(int bus, int slot, int func, int reg,
int bytes);
static int pcireg_cfgread(int bus, int slot, int func, int reg, int bytes);
static void pcireg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes);
#ifndef XEN
static int pcireg_cfgopen(void);
#endif
static int pciereg_cfgread(int bus, unsigned slot, unsigned func,
unsigned reg, unsigned bytes);
static void pciereg_cfgwrite(int bus, unsigned slot, unsigned func,
unsigned reg, int data, unsigned bytes);
/*
* Some BIOS writers seem to want to ignore the spec and put
* 0 in the intline rather than 255 to indicate none. Some use
* numbers in the range 128-254 to indicate something strange and
* apparently undocumented anywhere. Assume these are completely bogus
* and map them to 255, which means "none".
*/
static __inline int
pci_i386_map_intline(int line)
{
if (line == 0 || line >= 128)
return (PCI_INVALID_IRQ);
return (line);
}
#ifndef XEN
static u_int16_t
pcibios_get_version(void)
{
struct bios_regs args;
if (PCIbios.ventry == 0) {
PRVERB(("pcibios: No call entry point\n"));
return (0);
}
args.eax = PCIBIOS_BIOS_PRESENT;
if (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL))) {
PRVERB(("pcibios: BIOS_PRESENT call failed\n"));
return (0);
}
if (args.edx != 0x20494350) {
PRVERB(("pcibios: BIOS_PRESENT didn't return 'PCI ' in edx\n"));
return (0);
}
return (args.ebx & 0xffff);
}
#endif
/*
* Initialise access to PCI configuration space
*/
int
pci_cfgregopen(void)
{
#ifdef XEN
return (0);
#else
static int opened = 0;
uint64_t pciebar;
u_int16_t vid, did;
u_int16_t v;
if (opened)
return (1);
if (cfgmech == CFGMECH_NONE && pcireg_cfgopen() == 0)
return (0);
v = pcibios_get_version();
if (v > 0)
PRVERB(("pcibios: BIOS version %x.%02x\n", (v & 0xff00) >> 8,
v & 0xff));
mtx_init(&pcicfg_mtx, "pcicfg", NULL, MTX_SPIN);
opened = 1;
/* $PIR requires PCI BIOS 2.10 or greater. */
if (v >= 0x0210)
pci_pir_open();
if (cfgmech == CFGMECH_PCIE)
return (1);
/*
* Grope around in the PCI config space to see if this is a
* chipset that is capable of doing memory-mapped config cycles.
* This also implies that it can do PCIe extended config cycles.
*/
/* Check for supported chipsets */
vid = pci_cfgregread(0, 0, 0, PCIR_VENDOR, 2);
did = pci_cfgregread(0, 0, 0, PCIR_DEVICE, 2);
switch (vid) {
case 0x8086:
switch (did) {
case 0x3590:
case 0x3592:
/* Intel 7520 or 7320 */
pciebar = pci_cfgregread(0, 0, 0, 0xce, 2) << 16;
pcie_cfgregopen(pciebar, 0, 255);
break;
case 0x2580:
case 0x2584:
case 0x2590:
/* Intel 915, 925, or 915GM */
pciebar = pci_cfgregread(0, 0, 0, 0x48, 4);
pcie_cfgregopen(pciebar, 0, 255);
break;
}
}
return(1);
#endif
}
static uint32_t
pci_docfgregread(int bus, int slot, int func, int reg, int bytes)
{
if (cfgmech == CFGMECH_PCIE &&
(bus >= pcie_minbus && bus <= pcie_maxbus) &&
(bus != 0 || !(1 << slot & pcie_badslots)))
return (pciereg_cfgread(bus, slot, func, reg, bytes));
else
return (pcireg_cfgread(bus, slot, func, reg, bytes));
}
/*
* Read configuration space register
*/
u_int32_t
pci_cfgregread(int bus, int slot, int func, int reg, int bytes)
{
uint32_t line;
/*
* Some BIOS writers seem to want to ignore the spec and put
* 0 in the intline rather than 255 to indicate none. The rest of
* the code uses 255 as an invalid IRQ.
*/
if (reg == PCIR_INTLINE && bytes == 1) {
line = pci_docfgregread(bus, slot, func, PCIR_INTLINE, 1);
return (pci_i386_map_intline(line));
}
return (pci_docfgregread(bus, slot, func, reg, bytes));
}
/*
* Write configuration space register
*/
void
pci_cfgregwrite(int bus, int slot, int func, int reg, u_int32_t data, int bytes)
{
if (cfgmech == CFGMECH_PCIE &&
(bus >= pcie_minbus && bus <= pcie_maxbus) &&
(bus != 0 || !(1 << slot & pcie_badslots)))
pciereg_cfgwrite(bus, slot, func, reg, data, bytes);
else
pcireg_cfgwrite(bus, slot, func, reg, data, bytes);
}
/*
* Configuration space access using direct register operations
*/
/* enable configuration space accesses and return data port address */
static int
pci_cfgenable(unsigned bus, unsigned slot, unsigned func, int reg, int bytes)
{
int dataport = 0;
#ifdef XBOX
if (arch_i386_is_xbox) {
/*
* The Xbox MCPX chipset is a derivative of the nForce 1
* chipset. It almost has the same bus layout; some devices
* cannot be used, because they have been removed.
*/
/*
* Devices 00:00.1 and 00:00.2 used to be memory controllers on
* the nForce chipset, but on the Xbox, using them will lockup
* the chipset.
*/
if (bus == 0 && slot == 0 && (func == 1 || func == 2))
return dataport;
/*
* Bus 1 only contains a VGA controller at 01:00.0. When you try
* to probe beyond that device, you only get garbage, which
* could cause lockups.
*/
if (bus == 1 && (slot != 0 || func != 0))
return dataport;
/*
* Bus 2 used to contain the AGP controller, but the Xbox MCPX
* doesn't have one. Probing it can cause lockups.
*/
if (bus >= 2)
return dataport;
}
#endif
if (bus <= PCI_BUSMAX
&& slot < devmax
&& func <= PCI_FUNCMAX
&& (unsigned)reg <= PCI_REGMAX
&& bytes != 3
&& (unsigned)bytes <= 4
&& (reg & (bytes - 1)) == 0) {
switch (cfgmech) {
case CFGMECH_PCIE:
case CFGMECH_1:
outl(CONF1_ADDR_PORT, (1 << 31)
| (bus << 16) | (slot << 11)
| (func << 8) | (reg & ~0x03));
dataport = CONF1_DATA_PORT + (reg & 0x03);
break;
case CFGMECH_2:
outb(CONF2_ENABLE_PORT, 0xf0 | (func << 1));
outb(CONF2_FORWARD_PORT, bus);
dataport = 0xc000 | (slot << 8) | reg;
break;
}
}
return (dataport);
}
/* disable configuration space accesses */
static void
pci_cfgdisable(void)
{
switch (cfgmech) {
case CFGMECH_PCIE:
case CFGMECH_1:
/*
* Do nothing for the config mechanism 1 case.
* Writing a 0 to the address port can apparently
* confuse some bridges and cause spurious
* access failures.
*/
break;
case CFGMECH_2:
outb(CONF2_ENABLE_PORT, 0);
break;
}
}
static int
pcireg_cfgread(int bus, int slot, int func, int reg, int bytes)
{
int data = -1;
int port;
mtx_lock_spin(&pcicfg_mtx);
port = pci_cfgenable(bus, slot, func, reg, bytes);
if (port != 0) {
switch (bytes) {
case 1:
data = inb(port);
break;
case 2:
data = inw(port);
break;
case 4:
data = inl(port);
break;
}
pci_cfgdisable();
}
mtx_unlock_spin(&pcicfg_mtx);
return (data);
}
static void
pcireg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes)
{
int port;
mtx_lock_spin(&pcicfg_mtx);
port = pci_cfgenable(bus, slot, func, reg, bytes);
if (port != 0) {
switch (bytes) {
case 1:
outb(port, data);
break;
case 2:
outw(port, data);
break;
case 4:
outl(port, data);
break;
}
pci_cfgdisable();
}
mtx_unlock_spin(&pcicfg_mtx);
}
#ifndef XEN
/* check whether the configuration mechanism has been correctly identified */
static int
pci_cfgcheck(int maxdev)
{
uint32_t id, class;
uint8_t header;
uint8_t device;
int port;
if (bootverbose)
printf("pci_cfgcheck:\tdevice ");
for (device = 0; device < maxdev; device++) {
if (bootverbose)
printf("%d ", device);
port = pci_cfgenable(0, device, 0, 0, 4);
id = inl(port);
if (id == 0 || id == 0xffffffff)
continue;
port = pci_cfgenable(0, device, 0, 8, 4);
class = inl(port) >> 8;
if (bootverbose)
printf("[class=%06x] ", class);
if (class == 0 || (class & 0xf870ff) != 0)
continue;
port = pci_cfgenable(0, device, 0, 14, 1);
header = inb(port);
if (bootverbose)
printf("[hdr=%02x] ", header);
if ((header & 0x7e) != 0)
continue;
if (bootverbose)
printf("is there (id=%08x)\n", id);
pci_cfgdisable();
return (1);
}
if (bootverbose)
printf("-- nothing found\n");
pci_cfgdisable();
return (0);
}
static int
pcireg_cfgopen(void)
{
uint32_t mode1res, oldval1;
uint8_t mode2res, oldval2;
/* Check for type #1 first. */
oldval1 = inl(CONF1_ADDR_PORT);
if (bootverbose) {
printf("pci_open(1):\tmode 1 addr port (0x0cf8) is 0x%08x\n",
oldval1);
}
cfgmech = CFGMECH_1;
devmax = 32;
outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK);
DELAY(1);
mode1res = inl(CONF1_ADDR_PORT);
outl(CONF1_ADDR_PORT, oldval1);
if (bootverbose)
printf("pci_open(1a):\tmode1res=0x%08x (0x%08lx)\n", mode1res,
CONF1_ENABLE_CHK);
if (mode1res) {
if (pci_cfgcheck(32))
return (cfgmech);
}
outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK1);
mode1res = inl(CONF1_ADDR_PORT);
outl(CONF1_ADDR_PORT, oldval1);
if (bootverbose)
printf("pci_open(1b):\tmode1res=0x%08x (0x%08lx)\n", mode1res,
CONF1_ENABLE_CHK1);
if ((mode1res & CONF1_ENABLE_MSK1) == CONF1_ENABLE_RES1) {
if (pci_cfgcheck(32))
return (cfgmech);
}
/* Type #1 didn't work, so try type #2. */
oldval2 = inb(CONF2_ENABLE_PORT);
if (bootverbose) {
printf("pci_open(2):\tmode 2 enable port (0x0cf8) is 0x%02x\n",
oldval2);
}
if ((oldval2 & 0xf0) == 0) {
cfgmech = CFGMECH_2;
devmax = 16;
outb(CONF2_ENABLE_PORT, CONF2_ENABLE_CHK);
mode2res = inb(CONF2_ENABLE_PORT);
outb(CONF2_ENABLE_PORT, oldval2);
if (bootverbose)
printf("pci_open(2a):\tmode2res=0x%02x (0x%02x)\n",
mode2res, CONF2_ENABLE_CHK);
if (mode2res == CONF2_ENABLE_RES) {
if (bootverbose)
printf("pci_open(2a):\tnow trying mechanism 2\n");
if (pci_cfgcheck(16))
return (cfgmech);
}
}
/* Nothing worked, so punt. */
cfgmech = CFGMECH_NONE;
devmax = 0;
return (cfgmech);
}
int
pcie_cfgregopen(uint64_t base, uint8_t minbus, uint8_t maxbus)
{
struct pcie_cfg_list *pcielist;
struct pcie_cfg_elem *pcie_array, *elem;
#ifdef SMP
struct pcpu *pc;
#endif
vm_offset_t va;
uint32_t val1, val2;
int i, slot;
if (!mcfg_enable)
return (0);
if (minbus != 0)
return (0);
#ifndef PAE
if (base >= 0x100000000) {
if (bootverbose)
printf(
"PCI: Memory Mapped PCI configuration area base 0x%jx too high\n",
(uintmax_t)base);
return (0);
}
#endif
if (bootverbose)
printf("PCIe: Memory Mapped configuration base @ 0x%jx\n",
(uintmax_t)base);
#ifdef SMP
STAILQ_FOREACH(pc, &cpuhead, pc_allcpu)
#endif
{
pcie_array = malloc(sizeof(struct pcie_cfg_elem) * PCIE_CACHE,
M_DEVBUF, M_NOWAIT);
if (pcie_array == NULL)
return (0);
va = kmem_alloc_nofault(kernel_map, PCIE_CACHE * PAGE_SIZE);
if (va == 0) {
free(pcie_array, M_DEVBUF);
return (0);
}
#ifdef SMP
pcielist = &pcie_list[pc->pc_cpuid];
#else
pcielist = &pcie_list[0];
#endif
TAILQ_INIT(pcielist);
for (i = 0; i < PCIE_CACHE; i++) {
elem = &pcie_array[i];
elem->vapage = va + (i * PAGE_SIZE);
elem->papage = 0;
TAILQ_INSERT_HEAD(pcielist, elem, elem);
}
}
pcie_base = base;
pcie_minbus = minbus;
pcie_maxbus = maxbus;
cfgmech = CFGMECH_PCIE;
devmax = 32;
/*
* On some AMD systems, some of the devices on bus 0 are
* inaccessible using memory-mapped PCI config access. Walk
* bus 0 looking for such devices. For these devices, we will
* fall back to using type 1 config access instead.
*/
if (pci_cfgregopen() != 0) {
for (slot = 0; slot <= PCI_SLOTMAX; slot++) {
val1 = pcireg_cfgread(0, slot, 0, 0, 4);
if (val1 == 0xffffffff)
continue;
val2 = pciereg_cfgread(0, slot, 0, 0, 4);
if (val2 != val1)
pcie_badslots |= (1 << slot);
}
}
return (1);
}
#endif /* !XEN */
#define PCIE_PADDR(bar, reg, bus, slot, func) \
((bar) | \
(((bus) & 0xff) << 20) | \
(((slot) & 0x1f) << 15) | \
(((func) & 0x7) << 12) | \
((reg) & 0xfff))
/*
* Find an element in the cache that matches the physical page desired, or
* create a new mapping from the least recently used element.
* A very simple LRU algorithm is used here, does it need to be more
* efficient?
*/
static __inline struct pcie_cfg_elem *
pciereg_findelem(vm_paddr_t papage)
{
struct pcie_cfg_list *pcielist;
struct pcie_cfg_elem *elem;
pcielist = &pcie_list[PCPU_GET(cpuid)];
TAILQ_FOREACH(elem, pcielist, elem) {
if (elem->papage == papage)
break;
}
if (elem == NULL) {
elem = TAILQ_LAST(pcielist, pcie_cfg_list);
if (elem->papage != 0) {
pmap_kremove(elem->vapage);
invlpg(elem->vapage);
}
pmap_kenter(elem->vapage, papage);
elem->papage = papage;
}
if (elem != TAILQ_FIRST(pcielist)) {
TAILQ_REMOVE(pcielist, elem, elem);
TAILQ_INSERT_HEAD(pcielist, elem, elem);
}
return (elem);
}
static int
pciereg_cfgread(int bus, unsigned slot, unsigned func, unsigned reg,
unsigned bytes)
{
struct pcie_cfg_elem *elem;
volatile vm_offset_t va;
vm_paddr_t pa, papage;
int data = -1;
if (bus < pcie_minbus || bus > pcie_maxbus || slot > PCI_SLOTMAX ||
func > PCI_FUNCMAX || reg > PCIE_REGMAX)
return (-1);
critical_enter();
pa = PCIE_PADDR(pcie_base, reg, bus, slot, func);
papage = pa & ~PAGE_MASK;
elem = pciereg_findelem(papage);
va = elem->vapage | (pa & PAGE_MASK);
switch (bytes) {
case 4:
data = *(volatile uint32_t *)(va);
break;
case 2:
data = *(volatile uint16_t *)(va);
break;
case 1:
data = *(volatile uint8_t *)(va);
break;
}
critical_exit();
return (data);
}
static void
pciereg_cfgwrite(int bus, unsigned slot, unsigned func, unsigned reg, int data,
unsigned bytes)
{
struct pcie_cfg_elem *elem;
volatile vm_offset_t va;
vm_paddr_t pa, papage;
if (bus < pcie_minbus || bus > pcie_maxbus || slot > PCI_SLOTMAX ||
func > PCI_FUNCMAX || reg > PCIE_REGMAX)
return;
critical_enter();
pa = PCIE_PADDR(pcie_base, reg, bus, slot, func);
papage = pa & ~PAGE_MASK;
elem = pciereg_findelem(papage);
va = elem->vapage | (pa & PAGE_MASK);
switch (bytes) {
case 4:
*(volatile uint32_t *)(va) = data;
break;
case 2:
*(volatile uint16_t *)(va) = data;
break;
case 1:
*(volatile uint8_t *)(va) = data;
break;
}
critical_exit();
}