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kernel / pub / scm / linux / kernel / git / wtarreau / linux-2.4 / 08b263e5f5f159eeb635fcddf0e46f5ea7474414 / . / arch / ppc / kernel / pci.c
blob: 1a76e879ce86cfdc14cdb1e567340a612670cc43 [file] [log] [blame]
/*
* Common pmac/prep/chrp pci routines. -- Cort
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/bootmem.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/sections.h>
#include <asm/pci-bridge.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#undef DEBUG
#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif
unsigned long isa_io_base = 0;
unsigned long isa_mem_base = 0;
unsigned long pci_dram_offset = 0;
void pcibios_make_OF_bus_map(void);
static int pci_relocate_bridge_resource(struct pci_bus *bus, int i);
static int probe_resource(struct pci_bus *parent, struct resource *pr,
struct resource *res, struct resource **conflict);
static void update_bridge_base(struct pci_bus *bus, int i);
static void pcibios_fixup_resources(struct pci_dev* dev);
static void fixup_broken_pcnet32(struct pci_dev* dev);
static int reparent_resources(struct resource *parent, struct resource *res);
static void fixup_rev1_53c810(struct pci_dev* dev);
static void fixup_cpc710_pci64(struct pci_dev* dev);
#ifdef CONFIG_ALL_PPC
static void pcibios_fixup_cardbus(struct pci_dev* dev);
static u8* pci_to_OF_bus_map;
#endif
/* By default, we don't re-assign bus numbers. We do this only on
* some pmacs
*/
int pci_assign_all_busses;
struct pci_controller* hose_head;
struct pci_controller** hose_tail = &hose_head;
static int pci_bus_count;
struct pci_fixup pcibios_fixups[] = {
{ PCI_FIXUP_HEADER, PCI_VENDOR_ID_TRIDENT, PCI_ANY_ID, fixup_broken_pcnet32 },
{ PCI_FIXUP_HEADER, PCI_VENDOR_ID_NCR, PCI_DEVICE_ID_NCR_53C810, fixup_rev1_53c810 },
{ PCI_FIXUP_HEADER, PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64},
{ PCI_FIXUP_HEADER, PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources },
#ifdef CONFIG_ALL_PPC
/* We should add per-machine fixup support in xxx_setup.c or xxx_pci.c */
{ PCI_FIXUP_FINAL, PCI_VENDOR_ID_TI, PCI_ANY_ID, pcibios_fixup_cardbus },
#endif /* CONFIG_ALL_PPC */
{ 0 }
};
static void
fixup_rev1_53c810(struct pci_dev* dev)
{
/* rev 1 ncr53c810 chips don't set the class at all which means
* they don't get their resources remapped. Fix that here.
*/
if ((dev->class == PCI_CLASS_NOT_DEFINED)) {
printk("NCR 53c810 rev 1 detected, setting PCI class.\n");
dev->class = PCI_CLASS_STORAGE_SCSI;
}
}
static void
fixup_broken_pcnet32(struct pci_dev* dev)
{
if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) {
dev->vendor = PCI_VENDOR_ID_AMD;
pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD);
pci_name_device(dev);
}
}
static void
fixup_cpc710_pci64(struct pci_dev* dev)
{
/* Hide the PCI64 BARs from the kernel as their content doesn't
* fit well in the resource management
*/
dev->resource[0].start = dev->resource[0].end = 0;
dev->resource[0].flags = 0;
dev->resource[1].start = dev->resource[1].end = 0;
dev->resource[1].flags = 0;
}
void
pcibios_update_resource(struct pci_dev *dev, struct resource *root,
struct resource *res, int resource)
{
u32 new, check;
int reg;
struct pci_controller* hose = dev->sysdata;
unsigned long io_offset;
new = res->start;
res->flags &= ~IORESOURCE_UNSET;
if (hose && res->flags & IORESOURCE_IO) {
io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
new -= io_offset;
}
if (hose && res->flags & IORESOURCE_MEM)
new -= hose->pci_mem_offset;
new |= (res->flags & PCI_REGION_FLAG_MASK);
if (resource < 6) {
reg = PCI_BASE_ADDRESS_0 + 4*resource;
} else if (resource == PCI_ROM_RESOURCE) {
res->flags |= PCI_ROM_ADDRESS_ENABLE;
reg = dev->rom_base_reg;
} else {
/* Somebody might have asked allocation of a non-standard resource */
return;
}
pci_write_config_dword(dev, reg, new);
pci_read_config_dword(dev, reg, &check);
if ((new ^ check) & ((new & PCI_BASE_ADDRESS_SPACE_IO) ? PCI_BASE_ADDRESS_IO_MASK : PCI_BASE_ADDRESS_MEM_MASK)) {
printk(KERN_ERR "PCI: Error while updating region "
"%s/%d (%08x != %08x)\n", dev->slot_name, resource,
new, check);
}
printk(KERN_INFO "PCI: moved device %s resource %d (%lx) to %x\n",
dev->slot_name, resource, res->flags,
new & ~PCI_REGION_FLAG_MASK);
}
static void
pcibios_fixup_resources(struct pci_dev *dev)
{
struct pci_controller* hose = (struct pci_controller *)dev->sysdata;
int i;
unsigned long offset;
if (!hose) {
printk(KERN_ERR "No hose for PCI dev %s!\n", dev->slot_name);
return;
}
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
struct resource *res = dev->resource + i;
if (!res->flags)
continue;
if (!res->start || res->end == 0xffffffff) {
DBG("PCI:%s Resource %d [%08lx-%08lx] is unassigned\n",
dev->slot_name, i, res->start, res->end);
res->end -= res->start;
res->start = 0;
res->flags |= IORESOURCE_UNSET;
continue;
}
offset = 0;
if (res->flags & IORESOURCE_MEM) {
offset = hose->pci_mem_offset;
} else if (res->flags & IORESOURCE_IO) {
offset = (unsigned long) hose->io_base_virt
- isa_io_base;
}
if (offset != 0) {
res->start += offset;
res->end += offset;
#ifdef DEBUG
printk("Fixup res %d (%lx) of dev %s: %lx -> %lx\n",
i, res->flags, dev->slot_name,
res->start - offset, res->start);
#endif
}
}
/* Call machine specific resource fixup */
if (ppc_md.pcibios_fixup_resources)
ppc_md.pcibios_fixup_resources(dev);
}
#ifdef CONFIG_ALL_PPC
static void
pcibios_fixup_cardbus(struct pci_dev* dev)
{
if (_machine != _MACH_Pmac)
return;
/*
* Fix the interrupt routing on the various cardbus bridges
* used on powerbooks
*/
if (dev->vendor != PCI_VENDOR_ID_TI)
return;
if (dev->device == PCI_DEVICE_ID_TI_1130 ||
dev->device == PCI_DEVICE_ID_TI_1131) {
u8 val;
/* Enable PCI interrupt */
if (pci_read_config_byte(dev, 0x91, &val) == 0)
pci_write_config_byte(dev, 0x91, val | 0x30);
/* Disable ISA interrupt mode */
if (pci_read_config_byte(dev, 0x92, &val) == 0)
pci_write_config_byte(dev, 0x92, val & ~0x06);
}
if (dev->device == PCI_DEVICE_ID_TI_1210 ||
dev->device == PCI_DEVICE_ID_TI_1211 ||
dev->device == PCI_DEVICE_ID_TI_1410) {
u8 val;
/* 0x8c == TI122X_IRQMUX, 2 says to route the INTA
signal out the MFUNC0 pin */
if (pci_read_config_byte(dev, 0x8c, &val) == 0)
pci_write_config_byte(dev, 0x8c, (val & ~0x0f) | 2);
/* Disable ISA interrupt mode */
if (pci_read_config_byte(dev, 0x92, &val) == 0)
pci_write_config_byte(dev, 0x92, val & ~0x06);
}
}
#endif /* CONFIG_ALL_PPC */
/*
* We need to avoid collisions with `mirrored' VGA ports
* and other strange ISA hardware, so we always want the
* addresses to be allocated in the 0x000-0x0ff region
* modulo 0x400.
*
* Why? Because some silly external IO cards only decode
* the low 10 bits of the IO address. The 0x00-0xff region
* is reserved for motherboard devices that decode all 16
* bits, so it's ok to allocate at, say, 0x2800-0x28ff,
* but we want to try to avoid allocating at 0x2900-0x2bff
* which might have be mirrored at 0x0100-0x03ff..
*/
void
pcibios_align_resource(void *data, struct resource *res, unsigned long size,
unsigned long align)
{
struct pci_dev *dev = data;
if (res->flags & IORESOURCE_IO) {
unsigned long start = res->start;
if (size > 0x100) {
printk(KERN_ERR "PCI: I/O Region %s/%d too large"
" (%ld bytes)\n", dev->slot_name,
dev->resource - res, size);
}
if (start & 0x300) {
start = (start + 0x3ff) & ~0x3ff;
res->start = start;
}
}
}
/*
* Handle resources of PCI devices. If the world were perfect, we could
* just allocate all the resource regions and do nothing more. It isn't.
* On the other hand, we cannot just re-allocate all devices, as it would
* require us to know lots of host bridge internals. So we attempt to
* keep as much of the original configuration as possible, but tweak it
* when it's found to be wrong.
*
* Known BIOS problems we have to work around:
* - I/O or memory regions not configured
* - regions configured, but not enabled in the command register
* - bogus I/O addresses above 64K used
* - expansion ROMs left enabled (this may sound harmless, but given
* the fact the PCI specs explicitly allow address decoders to be
* shared between expansion ROMs and other resource regions, it's
* at least dangerous)
*
* Our solution:
* (1) Allocate resources for all buses behind PCI-to-PCI bridges.
* This gives us fixed barriers on where we can allocate.
* (2) Allocate resources for all enabled devices. If there is
* a collision, just mark the resource as unallocated. Also
* disable expansion ROMs during this step.
* (3) Try to allocate resources for disabled devices. If the
* resources were assigned correctly, everything goes well,
* if they weren't, they won't disturb allocation of other
* resources.
* (4) Assign new addresses to resources which were either
* not configured at all or misconfigured. If explicitly
* requested by the user, configure expansion ROM address
* as well.
*/
static void __init
pcibios_allocate_bus_resources(struct list_head *bus_list)
{
struct list_head *ln;
struct pci_bus *bus;
int i;
struct resource *res, *pr;
/* Depth-First Search on bus tree */
for (ln = bus_list->next; ln != bus_list; ln=ln->next) {
bus = pci_bus_b(ln);
for (i = 0; i < 4; ++i) {
if ((res = bus->resource[i]) == NULL || !res->flags
|| res->start > res->end)
continue;
if (bus->parent == NULL)
pr = (res->flags & IORESOURCE_IO)?
&ioport_resource: &iomem_resource;
else {
pr = pci_find_parent_resource(bus->self, res);
if (pr == res) {
/* this happens when the generic PCI
* code (wrongly) decides that this
* bridge is transparent -- paulus
*/
continue;
}
}
DBG("PCI: bridge rsrc %lx..%lx (%lx), parent %p\n",
res->start, res->end, res->flags, pr);
if (pr) {
if (request_resource(pr, res) == 0)
continue;
/*
* Must be a conflict with an existing entry.
* Move that entry (or entries) under the
* bridge resource and try again.
*/
if (reparent_resources(pr, res) == 0)
continue;
}
printk(KERN_ERR "PCI: Cannot allocate resource region "
"%d of PCI bridge %d\n", i, bus->number);
if (pci_relocate_bridge_resource(bus, i))
bus->resource[i] = NULL;
}
pcibios_allocate_bus_resources(&bus->children);
}
}
/*
* Reparent resource children of pr that conflict with res
* under res, and make res replace those children.
*/
static int __init
reparent_resources(struct resource *parent, struct resource *res)
{
struct resource *p, **pp;
struct resource **firstpp = NULL;
for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) {
if (p->end < res->start)
continue;
if (res->end < p->start)
break;
if (p->start < res->start || p->end > res->end)
return -1; /* not completely contained */
if (firstpp == NULL)
firstpp = pp;
}
if (firstpp == NULL)
return -1; /* didn't find any conflicting entries? */
res->parent = parent;
res->child = *firstpp;
res->sibling = *pp;
*firstpp = res;
*pp = NULL;
for (p = res->child; p != NULL; p = p->sibling) {
p->parent = res;
DBG(KERN_INFO "PCI: reparented %s [%lx..%lx] under %s\n",
p->name, p->start, p->end, res->name);
}
return 0;
}
/*
* A bridge has been allocated a range which is outside the range
* of its parent bridge, so it needs to be moved.
*/
static int __init
pci_relocate_bridge_resource(struct pci_bus *bus, int i)
{
struct resource *res, *pr, *conflict;
unsigned long try, size;
int j;
struct pci_bus *parent = bus->parent;
if (parent == NULL) {
/* shouldn't ever happen */
printk(KERN_ERR "PCI: can't move host bridge resource\n");
return -1;
}
res = bus->resource[i];
pr = NULL;
for (j = 0; j < 4; j++) {
struct resource *r = parent->resource[j];
if (!r)
continue;
if ((res->flags ^ r->flags) & (IORESOURCE_IO | IORESOURCE_MEM))
continue;
if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH)) {
pr = r;
break;
}
if (res->flags & IORESOURCE_PREFETCH)
pr = r;
}
if (pr == NULL)
return -1;
size = res->end - res->start;
if (pr->start > pr->end || size > pr->end - pr->start)
return -1;
try = pr->end + 1;
for (;;) {
try &= ~0xfffUL;
if (res->flags & IORESOURCE_MEM)
try &= ~0xfffffUL;
res->start = try - size - 1;
res->end = try - 1;
if (try <= size || res->start < pr->start)
return -1;
if (probe_resource(bus->parent, pr, res, &conflict) == 0)
break;
if (conflict->start <= pr->start + size)
return -1;
try = conflict->start;
}
if (request_resource(pr, res)) {
DBG(KERN_ERR "PCI: huh? couldn't move to %lx..%lx\n",
res->start, res->end);
return -1; /* "can't happen" */
}
update_bridge_base(bus, i);
printk(KERN_INFO "PCI: bridge %d resource %d moved to %lx..%lx\n",
bus->number, i, res->start, res->end);
return 0;
}
static int __init
probe_resource(struct pci_bus *parent, struct resource *pr,
struct resource *res, struct resource **conflict)
{
struct pci_bus *bus;
struct pci_dev *dev;
struct resource *r;
struct list_head *ln;
int i;
for (r = pr->child; r != NULL; r = r->sibling) {
if (r->end >= res->start && res->end >= r->start) {
*conflict = r;
return 1;
}
}
for (ln = parent->children.next; ln != &parent->children;
ln = ln->next) {
bus = pci_bus_b(ln);
for (i = 0; i < 4; ++i) {
if ((r = bus->resource[i]) == NULL)
continue;
if (!r->flags || r->start > r->end || r == res)
continue;
if (pci_find_parent_resource(bus->self, r) != pr)
continue;
if (r->end >= res->start && res->end >= r->start) {
*conflict = r;
return 1;
}
}
}
for (ln = parent->devices.next; ln != &parent->devices; ln=ln->next) {
dev = pci_dev_b(ln);
for (i = 0; i < 6; ++i) {
r = &dev->resource[i];
if (!r->flags || (r->flags & IORESOURCE_UNSET))
continue;
if (pci_find_parent_resource(bus->self, r) != pr)
continue;
if (r->end >= res->start && res->end >= r->start) {
*conflict = r;
return 1;
}
}
}
return 0;
}
static void __init
update_bridge_base(struct pci_bus *bus, int i)
{
struct resource *res = bus->resource[i];
u8 io_base_lo, io_limit_lo;
u16 mem_base, mem_limit;
u16 cmd;
unsigned long start, end, off;
struct pci_dev *dev = bus->self;
struct pci_controller *hose = dev->sysdata;
if (!hose) {
printk("update_bridge_base: no hose?\n");
return;
}
pci_read_config_word(dev, PCI_COMMAND, &cmd);
pci_write_config_word(dev, PCI_COMMAND,
cmd & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY));
if (res->flags & IORESOURCE_IO) {
u16 bu;
off = (unsigned long) hose->io_base_virt - isa_io_base;
start = res->start - off;
end = res->end - off;
pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &bu);
io_limit_lo &= PCI_IO_RANGE_TYPE_MASK;
if (io_base_lo == PCI_IO_RANGE_TYPE_16 && end > 0xffff) {
printk(KERN_ERR "bridge only supports 16-bit I/O!\n");
goto out;
}
io_base_lo |= (start >> 8) & PCI_IO_RANGE_MASK;
io_limit_lo |= (end >> 8) & PCI_IO_RANGE_MASK;
pci_write_config_word(dev, PCI_IO_BASE_UPPER16, start >> 16);
pci_write_config_word(dev, PCI_IO_LIMIT_UPPER16, end >> 16);
pci_write_config_byte(dev, PCI_IO_BASE, io_base_lo);
pci_write_config_byte(dev, PCI_IO_LIMIT, io_limit_lo);
} else if ((res->flags & (IORESOURCE_MEM | IORESOURCE_PREFETCH))
== IORESOURCE_MEM) {
off = hose->pci_mem_offset;
mem_base = ((res->start - off) >> 16) & PCI_MEMORY_RANGE_MASK;
mem_limit = ((res->end - off) >> 16) & PCI_MEMORY_RANGE_MASK;
pci_write_config_word(dev, PCI_MEMORY_BASE, mem_base);
pci_write_config_word(dev, PCI_MEMORY_LIMIT, mem_limit);
} else if ((res->flags & (IORESOURCE_MEM | IORESOURCE_PREFETCH))
== (IORESOURCE_MEM | IORESOURCE_PREFETCH)) {
off = hose->pci_mem_offset;
mem_base = ((res->start - off) >> 16) & PCI_PREF_RANGE_MASK;
mem_limit = ((res->end - off) >> 16) & PCI_PREF_RANGE_MASK;
pci_write_config_word(dev, PCI_PREF_MEMORY_BASE, mem_base);
pci_write_config_word(dev, PCI_PREF_MEMORY_LIMIT, mem_limit);
} else {
DBG(KERN_ERR "PCI: ugh, bridge %s res %d has flags=%lx\n",
dev->slot_name, i, res->flags);
}
out:
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
static inline void alloc_resource(struct pci_dev *dev, int idx)
{
struct resource *pr, *r = &dev->resource[idx];
DBG("PCI:%s: Resource %d: %08lx-%08lx (f=%lx)\n",
dev->slot_name, idx, r->start, r->end, r->flags);
pr = pci_find_parent_resource(dev, r);
if (!pr || request_resource(pr, r) < 0) {
printk(KERN_ERR "PCI: Cannot allocate resource region %d"
" of device %s\n", idx, dev->slot_name);
if (pr)
DBG("PCI: parent is %p: %08lx-%08lx (f=%lx)\n",
pr, pr->start, pr->end, pr->flags);
/* We'll assign a new address later */
r->flags |= IORESOURCE_UNSET;
r->end -= r->start;
r->start = 0;
}
}
static void __init
pcibios_allocate_resources(int pass)
{
struct pci_dev *dev;
int idx, disabled;
u16 command;
struct resource *r;
pci_for_each_dev(dev) {
pci_read_config_word(dev, PCI_COMMAND, &command);
for (idx = 0; idx < 6; idx++) {
r = &dev->resource[idx];
if (r->parent) /* Already allocated */
continue;
if (!r->flags || (r->flags & IORESOURCE_UNSET))
continue; /* Not assigned at all */
if (r->flags & IORESOURCE_IO)
disabled = !(command & PCI_COMMAND_IO);
else
disabled = !(command & PCI_COMMAND_MEMORY);
if (pass == disabled)
alloc_resource(dev, idx);
}
if (pass)
continue;
r = &dev->resource[PCI_ROM_RESOURCE];
if (r->flags & PCI_ROM_ADDRESS_ENABLE) {
/* Turn the ROM off, leave the resource region, but keep it unregistered. */
u32 reg;
DBG("PCI: Switching off ROM of %s\n", dev->slot_name);
r->flags &= ~PCI_ROM_ADDRESS_ENABLE;
pci_read_config_dword(dev, dev->rom_base_reg, &reg);
pci_write_config_dword(dev, dev->rom_base_reg,
reg & ~PCI_ROM_ADDRESS_ENABLE);
}
}
}
static void __init
pcibios_assign_resources(void)
{
struct pci_dev *dev;
int idx;
struct resource *r;
pci_for_each_dev(dev) {
int class = dev->class >> 8;
/* Don't touch classless devices and host bridges */
if (!class || class == PCI_CLASS_BRIDGE_HOST)
continue;
for (idx = 0; idx < 6; idx++) {
r = &dev->resource[idx];
/*
* We shall assign a new address to this resource,
* either because the BIOS (sic) forgot to do so
* or because we have decided the old address was
* unusable for some reason.
*/
if ((r->flags & IORESOURCE_UNSET) && r->end &&
(!ppc_md.pcibios_enable_device_hook ||
!ppc_md.pcibios_enable_device_hook(dev, 1)))
pci_assign_resource(dev, idx);
}
#if 0 /* don't assign ROMs */
r = &dev->resource[PCI_ROM_RESOURCE];
r->end -= r->start;
r->start = 0;
if (r->end)
pci_assign_resource(dev, PCI_ROM_RESOURCE);
#endif
}
}
int
pcibios_enable_resources(struct pci_dev *dev)
{
u16 cmd, old_cmd;
int idx;
struct resource *r;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
old_cmd = cmd;
for (idx=0; idx<6; idx++) {
r = &dev->resource[idx];
if (r->flags & IORESOURCE_UNSET) {
printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", dev->slot_name);
return -EINVAL;
}
if (r->flags & IORESOURCE_IO)
cmd |= PCI_COMMAND_IO;
if (r->flags & IORESOURCE_MEM)
cmd |= PCI_COMMAND_MEMORY;
}
if (dev->resource[PCI_ROM_RESOURCE].start)
cmd |= PCI_COMMAND_MEMORY;
if (cmd != old_cmd) {
printk("PCI: Enabling device %s (%04x -> %04x)\n", dev->slot_name, old_cmd, cmd);
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
return 0;
}
static int next_controller_index;
struct pci_controller * __init
pcibios_alloc_controller(void)
{
struct pci_controller *hose;
hose = (struct pci_controller *)alloc_bootmem(sizeof(*hose));
memset(hose, 0, sizeof(struct pci_controller));
*hose_tail = hose;
hose_tail = &hose->next;
hose->index = next_controller_index++;
return hose;
}
#ifdef CONFIG_ALL_PPC
/*
* Functions below are used on OpenFirmware machines.
*/
static void __openfirmware
make_one_node_map(struct device_node* node, u8 pci_bus)
{
int *bus_range;
int len;
if (pci_bus >= pci_bus_count)
return;
bus_range = (int *) get_property(node, "bus-range", &len);
if (bus_range == NULL || len < 2 * sizeof(int)) {
printk(KERN_WARNING "Can't get bus-range for %s\n",
node->full_name);
return;
}
pci_to_OF_bus_map[pci_bus] = bus_range[0];
for (node=node->child; node != 0;node = node->sibling) {
struct pci_dev* dev;
unsigned int *class_code, *reg;
class_code = (unsigned int *) get_property(node, "class-code", 0);
if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
continue;
reg = (unsigned int *)get_property(node, "reg", 0);
if (!reg)
continue;
dev = pci_find_slot(pci_bus, ((reg[0] >> 8) & 0xff));
if (!dev || !dev->subordinate)
continue;
make_one_node_map(node, dev->subordinate->number);
}
}
void __openfirmware
pcibios_make_OF_bus_map(void)
{
int i;
struct pci_controller* hose;
u8* of_prop_map;
pci_to_OF_bus_map = (u8*)kmalloc(pci_bus_count, GFP_KERNEL);
if (!pci_to_OF_bus_map) {
printk(KERN_ERR "Can't allocate OF bus map !\n");
return;
}
/* We fill the bus map with invalid values, that helps
* debugging.
*/
for (i=0; i<pci_bus_count; i++)
pci_to_OF_bus_map[i] = 0xff;
/* For each hose, we begin searching bridges */
for(hose=hose_head; hose; hose=hose->next) {
struct device_node* node;
node = (struct device_node *)hose->arch_data;
if (!node)
continue;
make_one_node_map(node, hose->first_busno);
}
of_prop_map = get_property(find_path_device("/"), "pci-OF-bus-map", 0);
if (of_prop_map)
memcpy(of_prop_map, pci_to_OF_bus_map, pci_bus_count);
#ifdef DEBUG
printk("PCI->OF bus map:\n");
for (i=0; i<pci_bus_count; i++) {
if (pci_to_OF_bus_map[i] == 0xff)
continue;
printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
}
#endif
}
typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data);
static struct device_node* __openfirmware
scan_OF_pci_childs(struct device_node* node, pci_OF_scan_iterator filter, void* data)
{
struct device_node* sub_node;
for (; node != 0;node = node->sibling) {
unsigned int *class_code;
if (filter(node, data))
return node;
/* For PCI<->PCI bridges or CardBus bridges, we go down
* Note: some OFs create a parent node "multifunc-device" as
* a fake root for all functions of a multi-function device,
* we go down them as well.
*/
class_code = (unsigned int *) get_property(node, "class-code", 0);
if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
strcmp(node->name, "multifunc-device"))
continue;
sub_node = scan_OF_pci_childs(node->child, filter, data);
if (sub_node)
return sub_node;
}
return NULL;
}
static int
scan_OF_pci_childs_iterator(struct device_node* node, void* data)
{
unsigned int *reg;
u8* fdata = (u8*)data;
reg = (unsigned int *) get_property(node, "reg", 0);
if (reg && ((reg[0] >> 8) & 0xff) == fdata[1]
&& ((reg[0] >> 16) & 0xff) == fdata[0])
return 1;
return 0;
}
static struct device_node* __openfirmware
scan_OF_childs_for_device(struct device_node* node, u8 bus, u8 dev_fn)
{
u8 filter_data[2] = {bus, dev_fn};
return scan_OF_pci_childs(node, scan_OF_pci_childs_iterator, filter_data);
}
/*
* Scans the OF tree for a device node matching a PCI device
*/
struct device_node*
pci_device_to_OF_node(struct pci_dev *dev)
{
struct pci_controller *hose;
struct device_node *node;
int bus;
if (!have_of)
return NULL;
/* Lookup the hose */
bus = dev->bus->number;
hose = pci_bus_to_hose(bus);
if (!hose)
return NULL;
/* Check it has an OF node associated */
node = (struct device_node *) hose->arch_data;
if (!node)
return NULL;
/* Fixup bus number according to what OF think it is. */
if (pci_to_OF_bus_map)
bus = pci_to_OF_bus_map[bus];
if (bus == 0xff)
return NULL;
/* Now, lookup childs of the hose */
return scan_OF_childs_for_device(node->child, bus, dev->devfn);
}
/* This routine is meant to be used early during boot, when the
* PCI bus numbers have not yet been assigned, and you need to
* issue PCI config cycles to an OF device.
* It could also be used to "fix" RTAS config cycles if you want
* to set pci_assign_all_busses to 1 and still use RTAS for PCI
* config cycles.
*/
struct pci_controller*
pci_find_hose_for_OF_device(struct device_node* node)
{
if (!have_of)
return NULL;
while(node) {
struct pci_controller* hose;
for (hose=hose_head;hose;hose=hose->next)
if (hose->arch_data == node)
return hose;
node=node->parent;
}
return NULL;
}
static int __openfirmware
find_OF_pci_device_filter(struct device_node* node, void* data)
{
return ((void *)node == data);
}
/*
* Returns the PCI device matching a given OF node
*/
int
pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
{
unsigned int *reg;
struct pci_controller* hose;
struct pci_dev* dev;
if (!have_of)
return -ENODEV;
/* Make sure it's really a PCI device */
hose = pci_find_hose_for_OF_device(node);
if (!hose || !hose->arch_data)
return -ENODEV;
if (!scan_OF_pci_childs(((struct device_node*)hose->arch_data)->child,
find_OF_pci_device_filter, (void *)node))
return -ENODEV;
reg = (unsigned int *) get_property(node, "reg", 0);
if (!reg)
return -ENODEV;
*bus = (reg[0] >> 16) & 0xff;
*devfn = ((reg[0] >> 8) & 0xff);
/* Ok, here we need some tweak. If we have already renumbered
* all busses, we can't rely on the OF bus number any more.
* the pci_to_OF_bus_map is not enough as several PCI busses
* may match the same OF bus number.
*/
if (!pci_to_OF_bus_map)
return 0;
pci_for_each_dev(dev) {
if (pci_to_OF_bus_map[dev->bus->number] != *bus)
continue;
if (dev->devfn != *devfn)
continue;
*bus = dev->bus->number;
return 0;
}
return -ENODEV;
}
void __init
pci_process_bridge_OF_ranges(struct pci_controller *hose,
struct device_node *dev, int primary)
{
unsigned int *ranges, *prev;
int rlen = 0;
int memno = 0;
struct resource *res;
int na = prom_n_addr_cells(dev);
int np = na + 5;
unsigned int size;
/* First we try to merge ranges to fix a problem with some pmacs
* that can have more than 3 ranges, fortunately using contiguous
* addresses -- BenH
*/
ranges = (unsigned int *) get_property(dev, "ranges", &rlen);
prev = NULL;
while ((rlen -= np * sizeof(unsigned int)) >= 0) {
if (prev) {
if (prev[0] == ranges[0] && prev[1] == ranges[1] &&
(prev[2] + prev[na+4]) == ranges[2] &&
(prev[na+2] + prev[na+4]) == ranges[na+2]) {
prev[na+4] += ranges[na+4];
ranges[0] = 0;
ranges += np;
continue;
}
}
prev = ranges;
ranges += np;
}
/*
* The ranges property is laid out as an array of elements,
* each of which comprises:
* cells 0 - 2: a PCI address
* cells 3 or 3+4: a CPU physical address
* (size depending on dev->n_addr_cells)
* cells 4+5 or 5+6: the size of the range
*/
rlen = 0;
hose->io_base_phys = 0;
ranges = (unsigned int *) get_property(dev, "ranges", &rlen);
while ((rlen -= np * sizeof(unsigned int)) >= 0) {
res = NULL;
size = ranges[na+4];
switch (ranges[0] >> 24) {
case 1: /* I/O space */
if (ranges[2] != 0)
break;
hose->io_base_phys = ranges[na+2];
/* limit I/O to 16MB */
if (size > 0x01000000)
size = 0x01000000;
hose->io_base_virt = ioremap(ranges[na+2], size);
if (primary)
isa_io_base = (unsigned long) hose->io_base_virt;
res = &hose->io_resource;
res->flags = IORESOURCE_IO;
res->start = ranges[2];
break;
case 2: /* memory space */
memno = 0;
if (ranges[1] == 0 && ranges[2] == 0
&& ranges[na+4] <= (16 << 20)) {
/* 1st 16MB, i.e. ISA memory area */
if (primary)
isa_mem_base = ranges[na+2];
memno = 1;
}
while (memno < 3 && hose->mem_resources[memno].flags)
++memno;
if (memno == 0)
hose->pci_mem_offset = ranges[na+2] - ranges[2];
if (memno < 3) {
res = &hose->mem_resources[memno];
res->flags = IORESOURCE_MEM;
res->start = ranges[na+2];
}
break;
}
if (res != NULL) {
res->name = dev->full_name;
res->end = res->start + size - 1;
res->parent = NULL;
res->sibling = NULL;
res->child = NULL;
}
ranges += np;
}
}
/* We create the "pci-OF-bus-map" property now so it appears in the
* /proc device tree
*/
void __init
pci_create_OF_bus_map(void)
{
struct property* of_prop;
of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
if (of_prop && find_path_device("/")) {
memset(of_prop, -1, sizeof(struct property) + 256);
of_prop->name = "pci-OF-bus-map";
of_prop->length = 256;
of_prop->value = (unsigned char *)&of_prop[1];
prom_add_property(find_path_device("/"), of_prop);
}
}
#endif /* CONFIG_ALL_PPC */
/*
* This set of routines checks for PCI<->PCI bridges that have closed
* IO resources and have child devices. It tries to re-open an IO
* window on them.
*
* This is a _temporary_ fix to workaround a problem with Apple's OF
* closing IO windows on P2P bridges when the OF drivers of cards
* below this bridge don't claim any IO range (typically ATI or
* Adaptec).
*
* A more complete fix would be to use drivers/pci/setup-bus.c, which
* involves a working pcibios_fixup_pbus_ranges(), some more care about
* ordering when creating the host bus resources, and maybe a few more
* minor tweaks
*/
/* Initialize bridges with base/limit values we have collected */
static void __init
do_update_p2p_io_resource(struct pci_bus *bus, int enable_vga)
{
struct pci_dev *bridge = bus->self;
struct pci_controller* hose = (struct pci_controller *)bridge->sysdata;
u32 l;
u16 w;
struct resource res;
res = *(bus->resource[0]);
DBG("Remapping Bus %d, bridge: %s\n", bus->number, bridge->name);
res.start -= ((unsigned long) hose->io_base_virt - isa_io_base);
res.end -= ((unsigned long) hose->io_base_virt - isa_io_base);
DBG(" IO window: %08lx-%08lx\n", res.start, res.end);
/* Set up the top and bottom of the PCI I/O segment for this bus. */
pci_read_config_dword(bridge, PCI_IO_BASE, &l);
l &= 0xffff000f;
l |= (res.start >> 8) & 0x00f0;
l |= res.end & 0xf000;
pci_write_config_dword(bridge, PCI_IO_BASE, l);
if ((l & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
l = (res.start >> 16) | (res.end & 0xffff0000);
pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, l);
}
pci_read_config_word(bridge, PCI_COMMAND, &w);
w |= PCI_COMMAND_IO;
pci_write_config_word(bridge, PCI_COMMAND, w);
#if 0 /* Enabling this causes XFree 4.2.0 to hang during PCI probe */
if (enable_vga) {
pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, &w);
w |= PCI_BRIDGE_CTL_VGA;
pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, w);
}
#endif
}
/* This function is pretty basic and actually quite broken for the
* general case, it's enough for us right now though. It's supposed
* to tell us if we need to open an IO range at all or not and what
* size.
*/
static int __init
check_for_io_childs(struct pci_bus *bus, struct resource* res, int *found_vga)
{
struct list_head *ln;
int i;
int rc = 0;
#define push_end(res, size) do { unsigned long __sz = (size) ; \
res->end = ((res->end + __sz) / (__sz + 1)) * (__sz + 1) + __sz; \
} while (0)
for (ln=bus->devices.next; ln != &bus->devices; ln=ln->next) {
struct pci_dev *dev = pci_dev_b(ln);
u16 class = dev->class >> 8;
if (class == PCI_CLASS_DISPLAY_VGA ||
class == PCI_CLASS_NOT_DEFINED_VGA)
*found_vga = 1;
if (class >> 8 == PCI_BASE_CLASS_BRIDGE && dev->subordinate)
rc |= check_for_io_childs(dev->subordinate, res, found_vga);
if (class == PCI_CLASS_BRIDGE_CARDBUS)
push_end(res, 0xfff);
for (i=0; i<PCI_NUM_RESOURCES; i++) {
struct resource *r;
unsigned long r_size;
if (dev->class >> 8 == PCI_CLASS_BRIDGE_PCI
&& i >= PCI_BRIDGE_RESOURCES)
continue;
r = &dev->resource[i];
r_size = r->end - r->start;
if (r_size < 0xfff)
r_size = 0xfff;
if (r->flags & IORESOURCE_IO && (r_size) != 0) {
rc = 1;
push_end(res, r_size);
}
}
}
return rc;
}
/* Here we scan all P2P bridges of a given level that have a closed
* IO window. Note that the test for the presence of a VGA card should
* be improved to take into account already configured P2P bridges,
* currently, we don't see them and might end up configuring 2 bridges
* with VGA pass through enabled
*/
static void __init
do_fixup_p2p_level(struct pci_bus *bus)
{
struct list_head *ln;
int i, parent_io;
int has_vga = 0;
for (parent_io=0; parent_io<4; parent_io++)
if (bus->resource[parent_io]->flags & IORESOURCE_IO)
break;
if (parent_io >= 4)
return;
for (ln=bus->children.next; ln != &bus->children; ln=ln->next) {
struct pci_bus *b = pci_bus_b(ln);
struct pci_dev *d = b->self;
struct pci_controller* hose = (struct pci_controller *)d->sysdata;
struct resource *res = b->resource[0];
struct resource tmp_res;
unsigned long max;
int found_vga = 0;
memset(&tmp_res, 0, sizeof(tmp_res));
tmp_res.start = bus->resource[parent_io]->start;
/* We don't let low addresses go through that closed P2P bridge, well,
* that may not be necessary but I feel safer that way
*/
if (tmp_res.start == 0)
tmp_res.start = 0x1000;
if (!list_empty(&b->devices) && res && res->flags == 0 &&
res != bus->resource[parent_io] &&
(d->class >> 8) == PCI_CLASS_BRIDGE_PCI &&
check_for_io_childs(b, &tmp_res, &found_vga)) {
u8 io_base_lo;
printk(KERN_INFO "Fixing up IO bus %s\n", b->name);
if (found_vga) {
if (has_vga) {
printk(KERN_WARNING "Skipping VGA, already active"
" on bus segment\n");
found_vga = 0;
} else
has_vga = 1;
}
pci_read_config_byte(d, PCI_IO_BASE, &io_base_lo);
if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32)
max = ((unsigned long) hose->io_base_virt
- isa_io_base) + 0xffffffff;
else
max = ((unsigned long) hose->io_base_virt
- isa_io_base) + 0xffff;
*res = tmp_res;
res->flags = IORESOURCE_IO;
res->name = b->name;
/* Find a resource in the parent where we can allocate */
for (i = 0 ; i < 4; i++) {
struct resource *r = bus->resource[i];
if (!r)
continue;
if ((r->flags & IORESOURCE_IO) == 0)
continue;
DBG("Trying to allocate from %08lx, size %08lx from parent"
" res %d: %08lx -> %08lx\n",
res->start, res->end, i, r->start, r->end);
if (allocate_resource(r, res, res->end + 1, res->start, max,
res->end + 1, NULL, NULL) < 0) {
DBG("Failed !\n");
continue;
}
do_update_p2p_io_resource(b, found_vga);
break;
}
}
do_fixup_p2p_level(b);
}
}
static void
pcibios_fixup_p2p_bridges(void)
{
struct list_head *ln;
for(ln=pci_root_buses.next; ln != &pci_root_buses; ln=ln->next) {
struct pci_bus *b = pci_bus_b(ln);
do_fixup_p2p_level(b);
}
}
void __init
pcibios_init(void)
{
struct pci_controller *hose;
struct pci_bus *bus;
int next_busno, bus_offset;
printk(KERN_INFO "PCI: Probing PCI hardware\n");
/* There is a problem with bus renumbering currently. If
* you have 2 sibling pci<->pci bridges, and during PCI
* probe, the first one gets assigned a new number equal
* to the old number of the second one, you'll end up
* probing that branch with 2 bridges racing on the bus
* numbers.
* I work around this on pmac by adding a large offset
* between host bridges, though a better long term solution
* will have to be found in the generic code. --BenH
*/
#ifdef CONFIG_ALL_PPC
if (machine_is_compatible("MacRISC"))
bus_offset = 0x10;
else
#endif
bus_offset = 1;
/* Scan all of the recorded PCI controllers. */
for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
if (pci_assign_all_busses)
hose->first_busno = next_busno;
hose->last_busno = 0xff;
bus = pci_scan_bus(hose->first_busno, hose->ops, hose);
hose->last_busno = bus->subordinate;
if (pci_assign_all_busses || next_busno <= hose->last_busno)
next_busno = hose->last_busno + bus_offset;
}
pci_bus_count = next_busno;
/* OpenFirmware based machines need a map of OF bus
* numbers vs. kernel bus numbers since we may have to
* remap them.
*/
if (pci_assign_all_busses && have_of)
pcibios_make_OF_bus_map();
/* Do machine dependent PCI interrupt routing */
if (ppc_md.pci_swizzle && ppc_md.pci_map_irq)
pci_fixup_irqs(ppc_md.pci_swizzle, ppc_md.pci_map_irq);
/* Call machine dependant fixup */
if (ppc_md.pcibios_fixup)
ppc_md.pcibios_fixup();
/* Allocate and assign resources */
pcibios_allocate_bus_resources(&pci_root_buses);
pcibios_allocate_resources(0);
pcibios_allocate_resources(1);
pcibios_fixup_p2p_bridges();
pcibios_assign_resources();
/* Call machine dependent post-init code */
if (ppc_md.pcibios_after_init)
ppc_md.pcibios_after_init();
}
unsigned char __init
common_swizzle(struct pci_dev *dev, unsigned char *pinp)
{
struct pci_controller *hose = dev->sysdata;
if (dev->bus->number != hose->first_busno) {
u8 pin = *pinp;
do {
pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
/* Move up the chain of bridges. */
dev = dev->bus->self;
} while (dev->bus->self);
*pinp = pin;
/* The slot is the idsel of the last bridge. */
}
return PCI_SLOT(dev->devfn);
}
void __init
pcibios_fixup_pbus_ranges(struct pci_bus * bus, struct pbus_set_ranges_data * ranges)
{
ranges->io_start -= bus->resource[0]->start;
ranges->io_end -= bus->resource[0]->start;
ranges->mem_start -= bus->resource[1]->start;
ranges->mem_end -= bus->resource[1]->start;
}
unsigned long resource_fixup(struct pci_dev * dev, struct resource * res,
unsigned long start, unsigned long size)
{
return start;
}
void __init pcibios_fixup_bus(struct pci_bus *bus)
{
struct pci_controller *hose = (struct pci_controller *) bus->sysdata;
unsigned long io_offset;
struct resource *res;
int i;
io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
if (bus->parent == NULL) {
/* This is a host bridge - fill in its resources */
hose->bus = bus;
bus->resource[0] = res = &hose->io_resource;
if (!res->flags) {
if (io_offset)
printk(KERN_ERR "I/O resource not set for host"
" bridge %d\n", hose->index);
res->start = 0;
res->end = IO_SPACE_LIMIT;
res->flags = IORESOURCE_IO;
}
res->start += io_offset;
res->end += io_offset;
for (i = 0; i < 3; ++i) {
res = &hose->mem_resources[i];
if (!res->flags) {
if (i > 0)
continue;
printk(KERN_ERR "Memory resource not set for "
"host bridge %d\n", hose->index);
res->start = hose->pci_mem_offset;
res->end = ~0U;
res->flags = IORESOURCE_MEM;
}
bus->resource[i+1] = res;
}
} else {
/* This is a subordinate bridge */
pci_read_bridge_bases(bus);
for (i = 0; i < 4; ++i) {
if ((res = bus->resource[i]) == NULL)
continue;
if (!res->flags)
continue;
if (io_offset && (res->flags & IORESOURCE_IO)) {
res->start += io_offset;
res->end += io_offset;
} else if (hose->pci_mem_offset
&& (res->flags & IORESOURCE_MEM)) {
res->start += hose->pci_mem_offset;
res->end += hose->pci_mem_offset;
}
}
}
if (ppc_md.pcibios_fixup_bus)
ppc_md.pcibios_fixup_bus(bus);
}
char __init *pcibios_setup(char *str)
{
return str;
}
/* the next one is stolen from the alpha port... */
void __init
pcibios_update_irq(struct pci_dev *dev, int irq)
{
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
/* XXX FIXME - update OF device tree node interrupt property */
}
int pcibios_enable_device(struct pci_dev *dev, int mask)
{
u16 cmd, old_cmd;
int idx;
struct resource *r;
if (ppc_md.pcibios_enable_device_hook)
if (ppc_md.pcibios_enable_device_hook(dev, 0))
return -EINVAL;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
old_cmd = cmd;
for (idx=0; idx<6; idx++) {
if(!(mask & (1<<idx)))
continue;
r = &dev->resource[idx];
if (r->flags & IORESOURCE_UNSET) {
printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", dev->slot_name);
return -EINVAL;
}
if (r->flags & IORESOURCE_IO)
cmd |= PCI_COMMAND_IO;
if (r->flags & IORESOURCE_MEM)
cmd |= PCI_COMMAND_MEMORY;
}
if (cmd != old_cmd) {
printk("PCI: Enabling device %s (%04x -> %04x)\n",
dev->slot_name, old_cmd, cmd);
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
return 0;
}
struct pci_controller*
pci_bus_to_hose(int bus)
{
struct pci_controller* hose = hose_head;
for (; hose; hose = hose->next)
if (bus >= hose->first_busno && bus <= hose->last_busno)
return hose;
return NULL;
}
void*
pci_bus_io_base(unsigned int bus)
{
struct pci_controller *hose;
hose = pci_bus_to_hose(bus);
if (!hose)
return NULL;
return hose->io_base_virt;
}
unsigned long
pci_bus_io_base_phys(unsigned int bus)
{
struct pci_controller *hose;
hose = pci_bus_to_hose(bus);
if (!hose)
return 0;
return hose->io_base_phys;
}
unsigned long
pci_bus_mem_base_phys(unsigned int bus)
{
struct pci_controller *hose;
hose = pci_bus_to_hose(bus);
if (!hose)
return 0;
return hose->pci_mem_offset;
}
unsigned long
pci_resource_to_bus(struct pci_dev *pdev, struct resource *res)
{
/* Hack alert again ! See comments in chrp_pci.c
*/
struct pci_controller* hose =
(struct pci_controller *)pdev->sysdata;
if (hose && res->flags & IORESOURCE_MEM)
return res->start - hose->pci_mem_offset;
/* We may want to do something with IOs here... */
return res->start;
}
/*
* Return the index of the PCI controller for device pdev.
*/
int pci_controller_num(struct pci_dev *dev)
{
struct pci_controller *hose = (struct pci_controller *) dev->sysdata;
return hose->index;
}
/*
* Platform support for /proc/bus/pci/X/Y mmap()s,
* modelled on the sparc64 implementation by Dave Miller.
* -- paulus.
*/
/*
* Adjust vm_pgoff of VMA such that it is the physical page offset
* corresponding to the 32-bit pci bus offset for DEV requested by the user.
*
* Basically, the user finds the base address for his device which he wishes
* to mmap. They read the 32-bit value from the config space base register,
* add whatever PAGE_SIZE multiple offset they wish, and feed this into the
* offset parameter of mmap on /proc/bus/pci/XXX for that device.
*
* Returns negative error code on failure, zero on success.
*/
static __inline__ int
__pci_mmap_make_offset(struct pci_dev *dev, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state)
{
struct pci_controller *hose = (struct pci_controller *) dev->sysdata;
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
unsigned long size = vma->vm_end - vma->vm_start;
unsigned long base;
struct resource *res;
int i;
int ret = -EINVAL;
if (hose == 0)
return -EINVAL; /* should never happen */
if (offset + size <= offset)
return -EINVAL;
if (mmap_state == pci_mmap_mem) {
/* PCI memory space */
base = hose->pci_mem_offset;
for (i = 0; i < 3; ++i) {
res = &hose->mem_resources[i];
if (offset >= res->start - base
&& offset + size - 1 <= res->end - base) {
ret = 0;
break;
}
}
offset += hose->pci_mem_offset;
} else {
/* PCI I/O space */
base = (unsigned long)hose->io_base_virt - isa_io_base;
res = &hose->io_resource;
if (offset >= res->start - base
&& offset + size - 1 <= res->end - base)
ret = 0;
offset += hose->io_base_phys;
}
vma->vm_pgoff = offset >> PAGE_SHIFT;
return ret;
}
/*
* Set vm_flags of VMA, as appropriate for this architecture, for a pci device
* mapping.
*/
static __inline__ void
__pci_mmap_set_flags(struct pci_dev *dev, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state)
{
vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO;
}
/*
* Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
* device mapping.
*/
static __inline__ void
__pci_mmap_set_pgprot(struct pci_dev *dev, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state, int write_combine)
{
int prot = pgprot_val(vma->vm_page_prot);
/* XXX would be nice to have a way to ask for write-through */
prot |= _PAGE_NO_CACHE;
if (!write_combine)
prot |= _PAGE_GUARDED;
vma->vm_page_prot = __pgprot(prot);
}
/*
* Perform the actual remap of the pages for a PCI device mapping, as
* appropriate for this architecture. The region in the process to map
* is described by vm_start and vm_end members of VMA, the base physical
* address is found in vm_pgoff.
* The pci device structure is provided so that architectures may make mapping
* decisions on a per-device or per-bus basis.
*
* Returns a negative error code on failure, zero on success.
*/
int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state,
int write_combine)
{
int ret;
ret = __pci_mmap_make_offset(dev, vma, mmap_state);
if (ret < 0)
return ret;
__pci_mmap_set_flags(dev, vma, mmap_state);
__pci_mmap_set_pgprot(dev, vma, mmap_state, write_combine);
ret = remap_page_range(vma->vm_start, vma->vm_pgoff << PAGE_SHIFT,
vma->vm_end - vma->vm_start, vma->vm_page_prot);
return ret;
}
/* Obsolete functions. Should be removed once the symbios driver
* is fixed
*/
unsigned long
phys_to_bus(unsigned long pa)
{
struct pci_controller *hose;
int i;
for (hose = hose_head; hose; hose = hose->next) {
for (i = 0; i < 3; ++i) {
if (pa >= hose->mem_resources[i].start
&& pa <= hose->mem_resources[i].end) {
/*
* XXX the hose->pci_mem_offset really
* only applies to mem_resources[0].
* We need a way to store an offset for
* the others. -- paulus
*/
if (i == 0)
pa -= hose->pci_mem_offset;
return pa;
}
}
}
/* hmmm, didn't find it */
return 0;
}
unsigned long
pci_phys_to_bus(unsigned long pa, int busnr)
{
struct pci_controller* hose = pci_bus_to_hose(busnr);
if (!hose)
return pa;
return pa - hose->pci_mem_offset;
}
unsigned long
pci_bus_to_phys(unsigned int ba, int busnr)
{
struct pci_controller* hose = pci_bus_to_hose(busnr);
if (!hose)
return ba;
return ba + hose->pci_mem_offset;
}
/* Provide information on locations of various I/O regions in physical
* memory. Do this on a per-card basis so that we choose the right
* root bridge.
* Note that the returned IO or memory base is a physical address
*/
long
sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
{
struct pci_controller* hose = pci_bus_to_hose(bus);
long result = -EOPNOTSUPP;
if (!hose)
return -ENODEV;
switch (which) {
case IOBASE_BRIDGE_NUMBER:
return (long)hose->first_busno;
case IOBASE_MEMORY:
return (long)hose->pci_mem_offset;
case IOBASE_IO:
return (long)hose->io_base_phys;
case IOBASE_ISA_IO:
return (long)isa_io_base;
case IOBASE_ISA_MEM:
return (long)isa_mem_base;
}
return result;
}
void __init
pci_init_resource(struct resource *res, unsigned long start, unsigned long end,
int flags, char *name)
{
res->start = start;
res->end = end;
res->flags = flags;
res->name = name;
res->parent = NULL;
res->sibling = NULL;
res->child = NULL;
}
/*
* Null PCI config access functions, for the case when we can't
* find a hose.
*/
#define NULL_PCI_OP(rw, size, type) \
static int \
null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \
{ \
return PCIBIOS_DEVICE_NOT_FOUND; \
}
NULL_PCI_OP(read, byte, u8 *)
NULL_PCI_OP(read, word, u16 *)
NULL_PCI_OP(read, dword, u32 *)
NULL_PCI_OP(write, byte, u8)
NULL_PCI_OP(write, word, u16)
NULL_PCI_OP(write, dword, u32)
static struct pci_ops null_pci_ops =
{
null_read_config_byte,
null_read_config_word,
null_read_config_dword,
null_write_config_byte,
null_write_config_word,
null_write_config_dword
};
/*
* These functions are used early on before PCI scanning is done
* and all of the pci_dev and pci_bus structures have been created.
*/
static struct pci_dev *
fake_pci_dev(struct pci_controller *hose, int busnr, int devfn)
{
static struct pci_dev dev;
static struct pci_bus bus;
if (hose == 0) {
hose = pci_bus_to_hose(busnr);
if (hose == 0)
printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
}
dev.bus = &bus;
dev.sysdata = hose;
dev.devfn = devfn;
bus.number = busnr;
bus.ops = hose? hose->ops: &null_pci_ops;
return &dev;
}
#define EARLY_PCI_OP(rw, size, type) \
int early_##rw##_config_##size(struct pci_controller *hose, int bus, \
int devfn, int offset, type value) \
{ \
return pci_##rw##_config_##size(fake_pci_dev(hose, bus, devfn), \
offset, value); \
}
EARLY_PCI_OP(read, byte, u8 *)
EARLY_PCI_OP(read, word, u16 *)
EARLY_PCI_OP(read, dword, u32 *)
EARLY_PCI_OP(write, byte, u8)
EARLY_PCI_OP(write, word, u16)
EARLY_PCI_OP(write, dword, u32)