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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/arch/powerpc/kernel/pci_32.c

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49 KiB
C
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/*
* Common pmac/prep/chrp pci routines. -- Cort
*/
#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 <linux/irq.h>
#include <linux/list.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/uaccess.h>
#include <asm/machdep.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;
int pcibios_assign_bus_offset = 1;
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_cpc710_pci64(struct pci_dev* dev);
#ifdef CONFIG_PPC_OF
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_buses;
struct pci_controller* hose_head;
struct pci_controller** hose_tail = &hose_head;
static int pci_bus_count;
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);
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TRIDENT, PCI_ANY_ID, fixup_broken_pcnet32);
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;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64);
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", pci_name(dev));
return;
}
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
struct resource *res = dev->resource + i;
if (!res->flags)
continue;
if (res->end == 0xffffffff) {
DBG("PCI:%s Resource %d [%016llx-%016llx] is unassigned\n",
pci_name(dev), i, (u64)res->start, (u64)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;
DBG("Fixup res %d (%lx) of dev %s: %llx -> %llx\n",
i, res->flags, pci_name(dev),
(u64)res->start - offset, (u64)res->start);
}
}
/* Call machine specific resource fixup */
if (ppc_md.pcibios_fixup_resources)
ppc_md.pcibios_fixup_resources(dev);
}
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources);
void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
struct resource *res)
{
unsigned long offset = 0;
struct pci_controller *hose = dev->sysdata;
if (hose && res->flags & IORESOURCE_IO)
offset = (unsigned long)hose->io_base_virt - isa_io_base;
else if (hose && res->flags & IORESOURCE_MEM)
offset = hose->pci_mem_offset;
region->start = res->start - offset;
region->end = res->end - offset;
}
EXPORT_SYMBOL(pcibios_resource_to_bus);
void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
struct pci_bus_region *region)
{
unsigned long offset = 0;
struct pci_controller *hose = dev->sysdata;
if (hose && res->flags & IORESOURCE_IO)
offset = (unsigned long)hose->io_base_virt - isa_io_base;
else if (hose && res->flags & IORESOURCE_MEM)
offset = hose->pci_mem_offset;
res->start = region->start + offset;
res->end = region->end + offset;
}
EXPORT_SYMBOL(pcibios_bus_to_resource);
/*
* 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,
resource_size_t size, resource_size_t align)
{
struct pci_dev *dev = data;
if (res->flags & IORESOURCE_IO) {
resource_size_t start = res->start;
if (size > 0x100) {
printk(KERN_ERR "PCI: I/O Region %s/%d too large"
" (%lld bytes)\n", pci_name(dev),
dev->resource - res, (unsigned long long)size);
}
if (start & 0x300) {
start = (start + 0x3ff) & ~0x3ff;
res->start = start;
}
}
}
EXPORT_SYMBOL(pcibios_align_resource);
/*
* 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 pci_bus *bus;
int i;
struct resource *res, *pr;
/* Depth-First Search on bus tree */
list_for_each_entry(bus, bus_list, node) {
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 %llx..%llx (%lx), parent %p\n",
(u64)res->start, (u64)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 [%llx..%llx] under %s\n",
p->name, (u64)p->start, (u64)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];
if (res == NULL)
return -1;
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;
for (;;) {
res->start = try - size;
res->end = try;
if (probe_resource(bus->parent, pr, res, &conflict) == 0)
break;
if (conflict->start <= pr->start + size)
return -1;
try = conflict->start - 1;
}
if (request_resource(pr, res)) {
DBG(KERN_ERR "PCI: huh? couldn't move to %llx..%llx\n",
(u64)res->start, (u64)res->end);
return -1; /* "can't happen" */
}
update_bridge_base(bus, i);
printk(KERN_INFO "PCI: bridge %d resource %d moved to %llx..%llx\n",
bus->number, i, (unsigned long long)res->start,
(unsigned long long)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;
int i;
for (r = pr->child; r != NULL; r = r->sibling) {
if (r->end >= res->start && res->end >= r->start) {
*conflict = r;
return 1;
}
}
list_for_each_entry(bus, &parent->children, node) {
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;
}
}
}
list_for_each_entry(dev, &parent->devices, bus_list) {
for (i = 0; i < 6; ++i) {
r = &dev->resource[i];
if (!r->flags || (r->flags & IORESOURCE_UNSET))
continue;
if (pci_find_parent_resource(dev, 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) {
off = (unsigned long) hose->io_base_virt - isa_io_base;
start = res->start - off;
end = res->end - off;
io_base_lo = (start >> 8) & PCI_IO_RANGE_MASK;
io_limit_lo = (end >> 8) & PCI_IO_RANGE_MASK;
if (end > 0xffff)
io_base_lo |= PCI_IO_RANGE_TYPE_32;
else
io_base_lo |= PCI_IO_RANGE_TYPE_16;
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",
pci_name(dev), i, res->flags);
}
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: %016llx-%016llx (f=%lx)\n",
pci_name(dev), idx, (u64)r->start, (u64)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, pci_name(dev));
if (pr)
DBG("PCI: parent is %p: %016llx-%016llx (f=%lx)\n",
pr, (u64)pr->start, (u64)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 = NULL;
int idx, disabled;
u16 command;
struct resource *r;
for_each_pci_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 & IORESOURCE_ROM_ENABLE) {
/* Turn the ROM off, leave the resource region, but keep it unregistered. */
u32 reg;
DBG("PCI: Switching off ROM of %s\n", pci_name(dev));
r->flags &= ~IORESOURCE_ROM_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 = NULL;
int idx;
struct resource *r;
for_each_pci_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))) {
r->flags &= ~IORESOURCE_UNSET;
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, int mask)
{
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++) {
/* Only set up the requested stuff */
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", pci_name(dev));
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", pci_name(dev), 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(struct device_node *dev)
{
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->global_number = next_controller_index++;
hose->arch_data = dev;
return hose;
}
#ifdef CONFIG_PPC_OF
/*
* Functions below are used on OpenFirmware machines.
*/
static void
make_one_node_map(struct device_node* node, u8 pci_bus)
{
const int *bus_range;
int len;
if (pci_bus >= pci_bus_count)
return;
bus_range = of_get_property(node, "bus-range", &len);
if (bus_range == NULL || len < 2 * sizeof(int)) {
printk(KERN_WARNING "Can't get bus-range for %s, "
"assuming it starts at 0\n", node->full_name);
pci_to_OF_bus_map[pci_bus] = 0;
} else
pci_to_OF_bus_map[pci_bus] = bus_range[0];
for (node=node->child; node != 0;node = node->sibling) {
struct pci_dev* dev;
const unsigned int *class_code, *reg;
class_code = of_get_property(node, "class-code", NULL);
if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
continue;
reg = of_get_property(node, "reg", NULL);
if (!reg)
continue;
dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
if (!dev || !dev->subordinate) {
pci_dev_put(dev);
continue;
}
make_one_node_map(node, dev->subordinate->number);
pci_dev_put(dev);
}
}
void
pcibios_make_OF_bus_map(void)
{
int i;
struct pci_controller* hose;
struct property *map_prop;
struct device_node *dn;
pci_to_OF_bus_map = 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);
}
dn = of_find_node_by_path("/");
map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
if (map_prop) {
BUG_ON(pci_bus_count > map_prop->length);
memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
}
of_node_put(dn);
#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*
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) {
const 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 = of_get_property(node, "class-code", NULL);
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 struct device_node *scan_OF_for_pci_dev(struct device_node *parent,
unsigned int devfn)
{
struct device_node *np = NULL;
const u32 *reg;
unsigned int psize;
while ((np = of_get_next_child(parent, np)) != NULL) {
reg = of_get_property(np, "reg", &psize);
if (reg == NULL || psize < 4)
continue;
if (((reg[0] >> 8) & 0xff) == devfn)
return np;
}
return NULL;
}
static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus)
{
struct device_node *parent, *np;
/* Are we a root bus ? */
if (bus->self == NULL || bus->parent == NULL) {
struct pci_controller *hose = pci_bus_to_host(bus);
if (hose == NULL)
return NULL;
return of_node_get(hose->arch_data);
}
/* not a root bus, we need to get our parent */
parent = scan_OF_for_pci_bus(bus->parent);
if (parent == NULL)
return NULL;
/* now iterate for children for a match */
np = scan_OF_for_pci_dev(parent, bus->self->devfn);
of_node_put(parent);
return np;
}
/*
* Scans the OF tree for a device node matching a PCI device
*/
struct device_node *
pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
{
struct device_node *parent, *np;
if (!have_of)
return NULL;
DBG("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
parent = scan_OF_for_pci_bus(bus);
if (parent == NULL)
return NULL;
DBG(" parent is %s\n", parent ? parent->full_name : "<NULL>");
np = scan_OF_for_pci_dev(parent, devfn);
of_node_put(parent);
DBG(" result is %s\n", np ? np->full_name : "<NULL>");
/* XXX most callers don't release the returned node
* mostly because ppc64 doesn't increase the refcount,
* we need to fix that.
*/
return np;
}
EXPORT_SYMBOL(pci_busdev_to_OF_node);
struct device_node*
pci_device_to_OF_node(struct pci_dev *dev)
{
return pci_busdev_to_OF_node(dev->bus, dev->devfn);
}
EXPORT_SYMBOL(pci_device_to_OF_node);
/* 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_buses 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
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)
{
const unsigned int *reg;
struct pci_controller* hose;
struct pci_dev* dev = NULL;
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 = of_get_property(node, "reg", NULL);
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;
for_each_pci_dev(dev)
if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
dev->devfn == *devfn) {
*bus = dev->bus->number;
pci_dev_put(dev);
return 0;
}
return -ENODEV;
}
EXPORT_SYMBOL(pci_device_from_OF_node);
void __init
pci_process_bridge_OF_ranges(struct pci_controller *hose,
struct device_node *dev, int primary)
{
static unsigned int static_lc_ranges[256] __initdata;
const unsigned int *dt_ranges;
unsigned int *lc_ranges, *ranges, *prev, size;
int rlen = 0, orig_rlen;
int memno = 0;
struct resource *res;
int np, na = of_n_addr_cells(dev);
np = na + 5;
/* 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
*/
dt_ranges = of_get_property(dev, "ranges", &rlen);
if (!dt_ranges)
return;
/* Sanity check, though hopefully that never happens */
if (rlen > sizeof(static_lc_ranges)) {
printk(KERN_WARNING "OF ranges property too large !\n");
rlen = sizeof(static_lc_ranges);
}
lc_ranges = static_lc_ranges;
memcpy(lc_ranges, dt_ranges, rlen);
orig_rlen = rlen;
/* Let's work on a copy of the "ranges" property instead of damaging
* the device-tree image in memory
*/
ranges = lc_ranges;
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
*/
ranges = lc_ranges;
rlen = orig_rlen;
while (ranges && (rlen -= np * sizeof(unsigned int)) >= 0) {
res = NULL;
size = ranges[na+4];
switch ((ranges[0] >> 24) & 0x3) {
case 1: /* I/O space */
if (ranges[2] != 0)
break;
hose->io_base_phys = ranges[na+2];
/* limit I/O space 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];
DBG("PCI: IO 0x%llx -> 0x%llx\n",
(u64)res->start, (u64)res->start + size - 1);
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;
if(ranges[0] & 0x40000000)
res->flags |= IORESOURCE_PREFETCH;
res->start = ranges[na+2];
DBG("PCI: MEM[%d] 0x%llx -> 0x%llx\n", memno,
(u64)res->start, (u64)res->start + size - 1);
}
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;
struct device_node *dn;
of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
if (!of_prop)
return;
dn = of_find_node_by_path("/");
if (dn) {
memset(of_prop, -1, sizeof(struct property) + 256);
of_prop->name = "pci-OF-bus-map";
of_prop->length = 256;
of_prop->value = &of_prop[1];
prom_add_property(dn, of_prop);
of_node_put(dn);
}
}
static ssize_t pci_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev;
struct device_node *np;
pdev = to_pci_dev (dev);
np = pci_device_to_OF_node(pdev);
if (np == NULL || np->full_name == NULL)
return 0;
return sprintf(buf, "%s", np->full_name);
}
static DEVICE_ATTR(devspec, S_IRUGO, pci_show_devspec, NULL);
#else /* CONFIG_PPC_OF */
void pcibios_make_OF_bus_map(void)
{
}
#endif /* CONFIG_PPC_OF */
/* Add sysfs properties */
void pcibios_add_platform_entries(struct pci_dev *pdev)
{
#ifdef CONFIG_PPC_OF
device_create_file(&pdev->dev, &dev_attr_devspec);
#endif /* CONFIG_PPC_OF */
}
#ifdef CONFIG_PPC_PMAC
/*
* 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;
if (bus->resource[0] == NULL)
return;
res = *(bus->resource[0]);
DBG("Remapping Bus %d, bridge: %s\n", bus->number, pci_name(bridge));
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: %016llx-%016llx\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 pci_dev *dev;
int i;
int rc = 0;
#define push_end(res, mask) do { \
BUG_ON((mask+1) & mask); \
res->end = (res->end + mask) | mask; \
} while (0)
list_for_each_entry(dev, &bus->devices, bus_list) {
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 pci_bus *b;
int i, parent_io;
int has_vga = 0;
for (parent_io=0; parent_io<4; parent_io++)
if (bus->resource[parent_io]
&& bus->resource[parent_io]->flags & IORESOURCE_IO)
break;
if (parent_io >= 4)
return;
list_for_each_entry(b, &bus->children, node) {
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 %016llx, size %016llx from parent"
" res %d: %016llx -> %016llx\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 pci_bus *b;
list_for_each_entry(b, &pci_root_buses, node)
do_fixup_p2p_level(b);
}
#endif /* CONFIG_PPC_PMAC */
static int __init
pcibios_init(void)
{
struct pci_controller *hose;
struct pci_bus *bus;
int next_busno;
printk(KERN_INFO "PCI: Probing PCI hardware\n");
/* Scan all of the recorded PCI controllers. */
for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
if (pci_assign_all_buses)
hose->first_busno = next_busno;
hose->last_busno = 0xff;
bus = pci_scan_bus_parented(hose->parent, hose->first_busno,
hose->ops, hose);
if (bus)
pci_bus_add_devices(bus);
hose->last_busno = bus->subordinate;
if (pci_assign_all_buses || next_busno <= hose->last_busno)
next_busno = hose->last_busno + pcibios_assign_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_buses && have_of)
pcibios_make_OF_bus_map();
/* Call machine dependent 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);
#ifdef CONFIG_PPC_PMAC
pcibios_fixup_p2p_bridges();
#endif /* CONFIG_PPC_PMAC */
pcibios_assign_resources();
/* Call machine dependent post-init code */
if (ppc_md.pcibios_after_init)
ppc_md.pcibios_after_init();
return 0;
}
subsys_initcall(pcibios_init);
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;
struct pci_dev *dev;
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->global_number);
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->global_number);
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 || bus->self->transparent)
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;
}
}
}
/* Platform specific bus fixups */
if (ppc_md.pcibios_fixup_bus)
ppc_md.pcibios_fixup_bus(bus);
/* Read default IRQs and fixup if necessary */
list_for_each_entry(dev, &bus->devices, bus_list) {
pci_read_irq_line(dev);
if (ppc_md.pci_irq_fixup)
ppc_md.pci_irq_fixup(dev);
}
}
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 */
}
#ifdef CONFIG_PPC_MERGE
/* XXX This is a copy of the ppc64 version. This is temporary until we start
* merging the 2 PCI layers
*/
/*
* Reads the interrupt pin to determine if interrupt is use by card.
* If the interrupt is used, then gets the interrupt line from the
* openfirmware and sets it in the pci_dev and pci_config line.
*/
int pci_read_irq_line(struct pci_dev *pci_dev)
{
struct of_irq oirq;
unsigned int virq;
DBG("Try to map irq for %s...\n", pci_name(pci_dev));
/* Try to get a mapping from the device-tree */
if (of_irq_map_pci(pci_dev, &oirq)) {
u8 line, pin;
/* If that fails, lets fallback to what is in the config
* space and map that through the default controller. We
* also set the type to level low since that's what PCI
* interrupts are. If your platform does differently, then
* either provide a proper interrupt tree or don't use this
* function.
*/
if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin))
return -1;
if (pin == 0)
return -1;
if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) ||
line == 0xff) {
return -1;
}
DBG(" -> no map ! Using irq line %d from PCI config\n", line);
virq = irq_create_mapping(NULL, line);
if (virq != NO_IRQ)
set_irq_type(virq, IRQ_TYPE_LEVEL_LOW);
} else {
DBG(" -> got one, spec %d cells (0x%08x...) on %s\n",
oirq.size, oirq.specifier[0], oirq.controller->full_name);
virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
oirq.size);
}
if(virq == NO_IRQ) {
DBG(" -> failed to map !\n");
return -1;
}
pci_dev->irq = virq;
return 0;
}
EXPORT_SYMBOL(pci_read_irq_line);
#endif /* CONFIG_PPC_MERGE */
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++) {
r = &dev->resource[idx];
if (r->flags & IORESOURCE_UNSET) {
printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", pci_name(dev));
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",
pci_name(dev), old_cmd, cmd);
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
return 0;
}
static 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;
}
static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
resource_size_t *offset,
enum pci_mmap_state mmap_state)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
unsigned long io_offset = 0;
int i, res_bit;
if (hose == 0)
return NULL; /* should never happen */
/* If memory, add on the PCI bridge address offset */
if (mmap_state == pci_mmap_mem) {
#if 0 /* See comment in pci_resource_to_user() for why this is disabled */
*offset += hose->pci_mem_offset;
#endif
res_bit = IORESOURCE_MEM;
} else {
io_offset = hose->io_base_virt - (void __iomem *)_IO_BASE;
*offset += io_offset;
res_bit = IORESOURCE_IO;
}
/*
* Check that the offset requested corresponds to one of the
* resources of the device.
*/
for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
struct resource *rp = &dev->resource[i];
int flags = rp->flags;
/* treat ROM as memory (should be already) */
if (i == PCI_ROM_RESOURCE)
flags |= IORESOURCE_MEM;
/* Active and same type? */
if ((flags & res_bit) == 0)
continue;
/* In the range of this resource? */
if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end)
continue;
/* found it! construct the final physical address */
if (mmap_state == pci_mmap_io)
*offset += hose->io_base_phys - io_offset;
return rp;
}
return NULL;
}
/*
* Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
* device mapping.
*/
static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp,
pgprot_t protection,
enum pci_mmap_state mmap_state,
int write_combine)
{
unsigned long prot = pgprot_val(protection);
/* Write combine is always 0 on non-memory space mappings. On
* memory space, if the user didn't pass 1, we check for a
* "prefetchable" resource. This is a bit hackish, but we use
* this to workaround the inability of /sysfs to provide a write
* combine bit
*/
if (mmap_state != pci_mmap_mem)
write_combine = 0;
else if (write_combine == 0) {
if (rp->flags & IORESOURCE_PREFETCH)
write_combine = 1;
}
/* XXX would be nice to have a way to ask for write-through */
prot |= _PAGE_NO_CACHE;
if (write_combine)
prot &= ~_PAGE_GUARDED;
else
prot |= _PAGE_GUARDED;
return __pgprot(prot);
}
/*
* This one is used by /dev/mem and fbdev who have no clue about the
* PCI device, it tries to find the PCI device first and calls the
* above routine
*/
pgprot_t pci_phys_mem_access_prot(struct file *file,
unsigned long pfn,
unsigned long size,
pgprot_t protection)
{
struct pci_dev *pdev = NULL;
struct resource *found = NULL;
unsigned long prot = pgprot_val(protection);
unsigned long offset = pfn << PAGE_SHIFT;
int i;
if (page_is_ram(pfn))
return __pgprot(prot);
prot |= _PAGE_NO_CACHE | _PAGE_GUARDED;
for_each_pci_dev(pdev) {
for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
struct resource *rp = &pdev->resource[i];
int flags = rp->flags;
/* Active and same type? */
if ((flags & IORESOURCE_MEM) == 0)
continue;
/* In the range of this resource? */
if (offset < (rp->start & PAGE_MASK) ||
offset > rp->end)
continue;
found = rp;
break;
}
if (found)
break;
}
if (found) {
if (found->flags & IORESOURCE_PREFETCH)
prot &= ~_PAGE_GUARDED;
pci_dev_put(pdev);
}
DBG("non-PCI map for %lx, prot: %lx\n", offset, prot);
return __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)
{
resource_size_t offset = vma->vm_pgoff << PAGE_SHIFT;
struct resource *rp;
int ret;
rp = __pci_mmap_make_offset(dev, &offset, mmap_state);
if (rp == NULL)
return -EINVAL;
vma->vm_pgoff = offset >> PAGE_SHIFT;
vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp,
vma->vm_page_prot,
mmap_state, write_combine);
ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
vma->vm_end - vma->vm_start, vma->vm_page_prot);
return ret;
}
/* 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;
long result = -EOPNOTSUPP;
/* Argh ! Please forgive me for that hack, but that's the
* simplest way to get existing XFree to not lockup on some
* G5 machines... So when something asks for bus 0 io base
* (bus 0 is HT root), we return the AGP one instead.
*/
#ifdef CONFIG_PPC_PMAC
if (machine_is(powermac) && machine_is_compatible("MacRISC4"))
if (bus == 0)
bus = 0xf0;
#endif /* CONFIG_PPC_PMAC */
hose = pci_bus_to_hose(bus);
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 pci_resource_to_user(const struct pci_dev *dev, int bar,
const struct resource *rsrc,
resource_size_t *start, resource_size_t *end)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
resource_size_t offset = 0;
if (hose == NULL)
return;
if (rsrc->flags & IORESOURCE_IO)
offset = (unsigned long)hose->io_base_virt - _IO_BASE;
/* We pass a fully fixed up address to userland for MMIO instead of
* a BAR value because X is lame and expects to be able to use that
* to pass to /dev/mem !
*
* That means that we'll have potentially 64 bits values where some
* userland apps only expect 32 (like X itself since it thinks only
* Sparc has 64 bits MMIO) but if we don't do that, we break it on
* 32 bits CHRPs :-(
*
* Hopefully, the sysfs insterface is immune to that gunk. Once X
* has been fixed (and the fix spread enough), we can re-enable the
* 2 lines below and pass down a BAR value to userland. In that case
* we'll also have to re-enable the matching code in
* __pci_mmap_make_offset().
*
* BenH.
*/
#if 0
else if (rsrc->flags & IORESOURCE_MEM)
offset = hose->pci_mem_offset;
#endif
*start = rsrc->start - offset;
*end = rsrc->end - offset;
}
unsigned long pci_address_to_pio(phys_addr_t address)
{
struct pci_controller* hose = hose_head;
for (; hose; hose = hose->next) {
unsigned int size = hose->io_resource.end -
hose->io_resource.start + 1;
if (address >= hose->io_base_phys &&
address < (hose->io_base_phys + size)) {
unsigned long base =
(unsigned long)hose->io_base_virt - _IO_BASE;
return base + (address - hose->io_base_phys);
}
}
return (unsigned int)-1;
}
EXPORT_SYMBOL(pci_address_to_pio);
/*
* 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; \
}
static int
null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
int len, u32 *val)
{
return PCIBIOS_DEVICE_NOT_FOUND;
}
static int
null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
int len, u32 val)
{
return PCIBIOS_DEVICE_NOT_FOUND;
}
static struct pci_ops null_pci_ops =
{
null_read_config,
null_write_config
};
/*
* 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_bus *
fake_pci_bus(struct pci_controller *hose, int busnr)
{
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);
}
bus.number = busnr;
bus.sysdata = hose;
bus.ops = hose? hose->ops: &null_pci_ops;
return &bus;
}
#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_bus_##rw##_config_##size(fake_pci_bus(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)
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