kernel-ark/arch/powerpc/kernel/prom_parse.c
Segher Boessenkool 58d383a622 [PATCH] powerpc: make OF interrupt tree parsing more strict
This patch fixes a bit of boundchecking in the new Open Firmware interrupt
tree parsing code.  It's important that it fails when things aren't correct in
order to trigger fallback mecanisms that are necessary to make some machines
work properly.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-07-10 13:24:20 -07:00

971 lines
23 KiB
C

#undef DEBUG
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/pci_regs.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#ifdef DEBUG
#define DBG(fmt...) do { printk(fmt); } while(0)
#else
#define DBG(fmt...) do { } while(0)
#endif
#ifdef CONFIG_PPC64
#define PRu64 "%lx"
#else
#define PRu64 "%llx"
#endif
/* Max address size we deal with */
#define OF_MAX_ADDR_CELLS 4
#define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
(ns) > 0)
/* Debug utility */
#ifdef DEBUG
static void of_dump_addr(const char *s, u32 *addr, int na)
{
printk("%s", s);
while(na--)
printk(" %08x", *(addr++));
printk("\n");
}
#else
static void of_dump_addr(const char *s, u32 *addr, int na) { }
#endif
/* Callbacks for bus specific translators */
struct of_bus {
const char *name;
const char *addresses;
int (*match)(struct device_node *parent);
void (*count_cells)(struct device_node *child,
int *addrc, int *sizec);
u64 (*map)(u32 *addr, u32 *range, int na, int ns, int pna);
int (*translate)(u32 *addr, u64 offset, int na);
unsigned int (*get_flags)(u32 *addr);
};
/*
* Default translator (generic bus)
*/
static void of_bus_default_count_cells(struct device_node *dev,
int *addrc, int *sizec)
{
if (addrc)
*addrc = prom_n_addr_cells(dev);
if (sizec)
*sizec = prom_n_size_cells(dev);
}
static u64 of_bus_default_map(u32 *addr, u32 *range, int na, int ns, int pna)
{
u64 cp, s, da;
cp = of_read_number(range, na);
s = of_read_number(range + na + pna, ns);
da = of_read_number(addr, na);
DBG("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
cp, s, da);
if (da < cp || da >= (cp + s))
return OF_BAD_ADDR;
return da - cp;
}
static int of_bus_default_translate(u32 *addr, u64 offset, int na)
{
u64 a = of_read_number(addr, na);
memset(addr, 0, na * 4);
a += offset;
if (na > 1)
addr[na - 2] = a >> 32;
addr[na - 1] = a & 0xffffffffu;
return 0;
}
static unsigned int of_bus_default_get_flags(u32 *addr)
{
return IORESOURCE_MEM;
}
/*
* PCI bus specific translator
*/
static int of_bus_pci_match(struct device_node *np)
{
/* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */
return !strcmp(np->type, "pci") || !strcmp(np->type, "vci");
}
static void of_bus_pci_count_cells(struct device_node *np,
int *addrc, int *sizec)
{
if (addrc)
*addrc = 3;
if (sizec)
*sizec = 2;
}
static u64 of_bus_pci_map(u32 *addr, u32 *range, int na, int ns, int pna)
{
u64 cp, s, da;
/* Check address type match */
if ((addr[0] ^ range[0]) & 0x03000000)
return OF_BAD_ADDR;
/* Read address values, skipping high cell */
cp = of_read_number(range + 1, na - 1);
s = of_read_number(range + na + pna, ns);
da = of_read_number(addr + 1, na - 1);
DBG("OF: PCI map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
if (da < cp || da >= (cp + s))
return OF_BAD_ADDR;
return da - cp;
}
static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
{
return of_bus_default_translate(addr + 1, offset, na - 1);
}
static unsigned int of_bus_pci_get_flags(u32 *addr)
{
unsigned int flags = 0;
u32 w = addr[0];
switch((w >> 24) & 0x03) {
case 0x01:
flags |= IORESOURCE_IO;
case 0x02: /* 32 bits */
case 0x03: /* 64 bits */
flags |= IORESOURCE_MEM;
}
if (w & 0x40000000)
flags |= IORESOURCE_PREFETCH;
return flags;
}
/*
* ISA bus specific translator
*/
static int of_bus_isa_match(struct device_node *np)
{
return !strcmp(np->name, "isa");
}
static void of_bus_isa_count_cells(struct device_node *child,
int *addrc, int *sizec)
{
if (addrc)
*addrc = 2;
if (sizec)
*sizec = 1;
}
static u64 of_bus_isa_map(u32 *addr, u32 *range, int na, int ns, int pna)
{
u64 cp, s, da;
/* Check address type match */
if ((addr[0] ^ range[0]) & 0x00000001)
return OF_BAD_ADDR;
/* Read address values, skipping high cell */
cp = of_read_number(range + 1, na - 1);
s = of_read_number(range + na + pna, ns);
da = of_read_number(addr + 1, na - 1);
DBG("OF: ISA map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
if (da < cp || da >= (cp + s))
return OF_BAD_ADDR;
return da - cp;
}
static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
{
return of_bus_default_translate(addr + 1, offset, na - 1);
}
static unsigned int of_bus_isa_get_flags(u32 *addr)
{
unsigned int flags = 0;
u32 w = addr[0];
if (w & 1)
flags |= IORESOURCE_IO;
else
flags |= IORESOURCE_MEM;
return flags;
}
/*
* Array of bus specific translators
*/
static struct of_bus of_busses[] = {
/* PCI */
{
.name = "pci",
.addresses = "assigned-addresses",
.match = of_bus_pci_match,
.count_cells = of_bus_pci_count_cells,
.map = of_bus_pci_map,
.translate = of_bus_pci_translate,
.get_flags = of_bus_pci_get_flags,
},
/* ISA */
{
.name = "isa",
.addresses = "reg",
.match = of_bus_isa_match,
.count_cells = of_bus_isa_count_cells,
.map = of_bus_isa_map,
.translate = of_bus_isa_translate,
.get_flags = of_bus_isa_get_flags,
},
/* Default */
{
.name = "default",
.addresses = "reg",
.match = NULL,
.count_cells = of_bus_default_count_cells,
.map = of_bus_default_map,
.translate = of_bus_default_translate,
.get_flags = of_bus_default_get_flags,
},
};
static struct of_bus *of_match_bus(struct device_node *np)
{
int i;
for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
if (!of_busses[i].match || of_busses[i].match(np))
return &of_busses[i];
BUG();
return NULL;
}
static int of_translate_one(struct device_node *parent, struct of_bus *bus,
struct of_bus *pbus, u32 *addr,
int na, int ns, int pna)
{
u32 *ranges;
unsigned int rlen;
int rone;
u64 offset = OF_BAD_ADDR;
/* Normally, an absence of a "ranges" property means we are
* crossing a non-translatable boundary, and thus the addresses
* below the current not cannot be converted to CPU physical ones.
* Unfortunately, while this is very clear in the spec, it's not
* what Apple understood, and they do have things like /uni-n or
* /ht nodes with no "ranges" property and a lot of perfectly
* useable mapped devices below them. Thus we treat the absence of
* "ranges" as equivalent to an empty "ranges" property which means
* a 1:1 translation at that level. It's up to the caller not to try
* to translate addresses that aren't supposed to be translated in
* the first place. --BenH.
*/
ranges = (u32 *)get_property(parent, "ranges", &rlen);
if (ranges == NULL || rlen == 0) {
offset = of_read_number(addr, na);
memset(addr, 0, pna * 4);
DBG("OF: no ranges, 1:1 translation\n");
goto finish;
}
DBG("OF: walking ranges...\n");
/* Now walk through the ranges */
rlen /= 4;
rone = na + pna + ns;
for (; rlen >= rone; rlen -= rone, ranges += rone) {
offset = bus->map(addr, ranges, na, ns, pna);
if (offset != OF_BAD_ADDR)
break;
}
if (offset == OF_BAD_ADDR) {
DBG("OF: not found !\n");
return 1;
}
memcpy(addr, ranges + na, 4 * pna);
finish:
of_dump_addr("OF: parent translation for:", addr, pna);
DBG("OF: with offset: "PRu64"\n", offset);
/* Translate it into parent bus space */
return pbus->translate(addr, offset, pna);
}
/*
* Translate an address from the device-tree into a CPU physical address,
* this walks up the tree and applies the various bus mappings on the
* way.
*
* Note: We consider that crossing any level with #size-cells == 0 to mean
* that translation is impossible (that is we are not dealing with a value
* that can be mapped to a cpu physical address). This is not really specified
* that way, but this is traditionally the way IBM at least do things
*/
u64 of_translate_address(struct device_node *dev, u32 *in_addr)
{
struct device_node *parent = NULL;
struct of_bus *bus, *pbus;
u32 addr[OF_MAX_ADDR_CELLS];
int na, ns, pna, pns;
u64 result = OF_BAD_ADDR;
DBG("OF: ** translation for device %s **\n", dev->full_name);
/* Increase refcount at current level */
of_node_get(dev);
/* Get parent & match bus type */
parent = of_get_parent(dev);
if (parent == NULL)
goto bail;
bus = of_match_bus(parent);
/* Cound address cells & copy address locally */
bus->count_cells(dev, &na, &ns);
if (!OF_CHECK_COUNTS(na, ns)) {
printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
dev->full_name);
goto bail;
}
memcpy(addr, in_addr, na * 4);
DBG("OF: bus is %s (na=%d, ns=%d) on %s\n",
bus->name, na, ns, parent->full_name);
of_dump_addr("OF: translating address:", addr, na);
/* Translate */
for (;;) {
/* Switch to parent bus */
of_node_put(dev);
dev = parent;
parent = of_get_parent(dev);
/* If root, we have finished */
if (parent == NULL) {
DBG("OF: reached root node\n");
result = of_read_number(addr, na);
break;
}
/* Get new parent bus and counts */
pbus = of_match_bus(parent);
pbus->count_cells(dev, &pna, &pns);
if (!OF_CHECK_COUNTS(pna, pns)) {
printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
dev->full_name);
break;
}
DBG("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
pbus->name, pna, pns, parent->full_name);
/* Apply bus translation */
if (of_translate_one(dev, bus, pbus, addr, na, ns, pna))
break;
/* Complete the move up one level */
na = pna;
ns = pns;
bus = pbus;
of_dump_addr("OF: one level translation:", addr, na);
}
bail:
of_node_put(parent);
of_node_put(dev);
return result;
}
EXPORT_SYMBOL(of_translate_address);
u32 *of_get_address(struct device_node *dev, int index, u64 *size,
unsigned int *flags)
{
u32 *prop;
unsigned int psize;
struct device_node *parent;
struct of_bus *bus;
int onesize, i, na, ns;
/* Get parent & match bus type */
parent = of_get_parent(dev);
if (parent == NULL)
return NULL;
bus = of_match_bus(parent);
bus->count_cells(dev, &na, &ns);
of_node_put(parent);
if (!OF_CHECK_COUNTS(na, ns))
return NULL;
/* Get "reg" or "assigned-addresses" property */
prop = (u32 *)get_property(dev, bus->addresses, &psize);
if (prop == NULL)
return NULL;
psize /= 4;
onesize = na + ns;
for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
if (i == index) {
if (size)
*size = of_read_number(prop + na, ns);
if (flags)
*flags = bus->get_flags(prop);
return prop;
}
return NULL;
}
EXPORT_SYMBOL(of_get_address);
u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
unsigned int *flags)
{
u32 *prop;
unsigned int psize;
struct device_node *parent;
struct of_bus *bus;
int onesize, i, na, ns;
/* Get parent & match bus type */
parent = of_get_parent(dev);
if (parent == NULL)
return NULL;
bus = of_match_bus(parent);
if (strcmp(bus->name, "pci")) {
of_node_put(parent);
return NULL;
}
bus->count_cells(dev, &na, &ns);
of_node_put(parent);
if (!OF_CHECK_COUNTS(na, ns))
return NULL;
/* Get "reg" or "assigned-addresses" property */
prop = (u32 *)get_property(dev, bus->addresses, &psize);
if (prop == NULL)
return NULL;
psize /= 4;
onesize = na + ns;
for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
if ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
if (size)
*size = of_read_number(prop + na, ns);
if (flags)
*flags = bus->get_flags(prop);
return prop;
}
return NULL;
}
EXPORT_SYMBOL(of_get_pci_address);
static int __of_address_to_resource(struct device_node *dev, u32 *addrp,
u64 size, unsigned int flags,
struct resource *r)
{
u64 taddr;
if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
return -EINVAL;
taddr = of_translate_address(dev, addrp);
if (taddr == OF_BAD_ADDR)
return -EINVAL;
memset(r, 0, sizeof(struct resource));
if (flags & IORESOURCE_IO) {
unsigned long port;
port = pci_address_to_pio(taddr);
if (port == (unsigned long)-1)
return -EINVAL;
r->start = port;
r->end = port + size - 1;
} else {
r->start = taddr;
r->end = taddr + size - 1;
}
r->flags = flags;
r->name = dev->name;
return 0;
}
int of_address_to_resource(struct device_node *dev, int index,
struct resource *r)
{
u32 *addrp;
u64 size;
unsigned int flags;
addrp = of_get_address(dev, index, &size, &flags);
if (addrp == NULL)
return -EINVAL;
return __of_address_to_resource(dev, addrp, size, flags, r);
}
EXPORT_SYMBOL_GPL(of_address_to_resource);
int of_pci_address_to_resource(struct device_node *dev, int bar,
struct resource *r)
{
u32 *addrp;
u64 size;
unsigned int flags;
addrp = of_get_pci_address(dev, bar, &size, &flags);
if (addrp == NULL)
return -EINVAL;
return __of_address_to_resource(dev, addrp, size, flags, r);
}
EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
void of_parse_dma_window(struct device_node *dn, unsigned char *dma_window_prop,
unsigned long *busno, unsigned long *phys, unsigned long *size)
{
u32 *dma_window, cells;
unsigned char *prop;
dma_window = (u32 *)dma_window_prop;
/* busno is always one cell */
*busno = *(dma_window++);
prop = get_property(dn, "ibm,#dma-address-cells", NULL);
if (!prop)
prop = get_property(dn, "#address-cells", NULL);
cells = prop ? *(u32 *)prop : prom_n_addr_cells(dn);
*phys = of_read_number(dma_window, cells);
dma_window += cells;
prop = get_property(dn, "ibm,#dma-size-cells", NULL);
cells = prop ? *(u32 *)prop : prom_n_size_cells(dn);
*size = of_read_number(dma_window, cells);
}
/*
* Interrupt remapper
*/
static unsigned int of_irq_workarounds;
static struct device_node *of_irq_dflt_pic;
static struct device_node *of_irq_find_parent(struct device_node *child)
{
struct device_node *p;
phandle *parp;
if (!of_node_get(child))
return NULL;
do {
parp = (phandle *)get_property(child, "interrupt-parent", NULL);
if (parp == NULL)
p = of_get_parent(child);
else {
if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
p = of_node_get(of_irq_dflt_pic);
else
p = of_find_node_by_phandle(*parp);
}
of_node_put(child);
child = p;
} while (p && get_property(p, "#interrupt-cells", NULL) == NULL);
return p;
}
static u8 of_irq_pci_swizzle(u8 slot, u8 pin)
{
return (((pin - 1) + slot) % 4) + 1;
}
/* This doesn't need to be called if you don't have any special workaround
* flags to pass
*/
void of_irq_map_init(unsigned int flags)
{
of_irq_workarounds = flags;
/* OldWorld, don't bother looking at other things */
if (flags & OF_IMAP_OLDWORLD_MAC)
return;
/* If we don't have phandles, let's try to locate a default interrupt
* controller (happens when booting with BootX). We do a first match
* here, hopefully, that only ever happens on machines with one
* controller.
*/
if (flags & OF_IMAP_NO_PHANDLE) {
struct device_node *np;
for(np = NULL; (np = of_find_all_nodes(np)) != NULL;) {
if (get_property(np, "interrupt-controller", NULL)
== NULL)
continue;
/* Skip /chosen/interrupt-controller */
if (strcmp(np->name, "chosen") == 0)
continue;
/* It seems like at least one person on this planet wants
* to use BootX on a machine with an AppleKiwi controller
* which happens to pretend to be an interrupt
* controller too.
*/
if (strcmp(np->name, "AppleKiwi") == 0)
continue;
/* I think we found one ! */
of_irq_dflt_pic = np;
break;
}
}
}
int of_irq_map_raw(struct device_node *parent, u32 *intspec, u32 *addr,
struct of_irq *out_irq)
{
struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
u32 *tmp, *imap, *imask;
u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
int imaplen, match, i;
ipar = of_node_get(parent);
/* First get the #interrupt-cells property of the current cursor
* that tells us how to interpret the passed-in intspec. If there
* is none, we are nice and just walk up the tree
*/
do {
tmp = (u32 *)get_property(ipar, "#interrupt-cells", NULL);
if (tmp != NULL) {
intsize = *tmp;
break;
}
tnode = ipar;
ipar = of_irq_find_parent(ipar);
of_node_put(tnode);
} while (ipar);
if (ipar == NULL) {
DBG(" -> no parent found !\n");
goto fail;
}
DBG("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize);
/* Look for this #address-cells. We have to implement the old linux
* trick of looking for the parent here as some device-trees rely on it
*/
old = of_node_get(ipar);
do {
tmp = (u32 *)get_property(old, "#address-cells", NULL);
tnode = of_get_parent(old);
of_node_put(old);
old = tnode;
} while(old && tmp == NULL);
of_node_put(old);
old = NULL;
addrsize = (tmp == NULL) ? 2 : *tmp;
DBG(" -> addrsize=%d\n", addrsize);
/* Now start the actual "proper" walk of the interrupt tree */
while (ipar != NULL) {
/* Now check if cursor is an interrupt-controller and if it is
* then we are done
*/
if (get_property(ipar, "interrupt-controller", NULL) != NULL) {
DBG(" -> got it !\n");
memcpy(out_irq->specifier, intspec,
intsize * sizeof(u32));
out_irq->size = intsize;
out_irq->controller = ipar;
of_node_put(old);
return 0;
}
/* Now look for an interrupt-map */
imap = (u32 *)get_property(ipar, "interrupt-map", &imaplen);
/* No interrupt map, check for an interrupt parent */
if (imap == NULL) {
DBG(" -> no map, getting parent\n");
newpar = of_irq_find_parent(ipar);
goto skiplevel;
}
imaplen /= sizeof(u32);
/* Look for a mask */
imask = (u32 *)get_property(ipar, "interrupt-map-mask", NULL);
/* If we were passed no "reg" property and we attempt to parse
* an interrupt-map, then #address-cells must be 0.
* Fail if it's not.
*/
if (addr == NULL && addrsize != 0) {
DBG(" -> no reg passed in when needed !\n");
goto fail;
}
/* Parse interrupt-map */
match = 0;
while (imaplen > (addrsize + intsize + 1) && !match) {
/* Compare specifiers */
match = 1;
for (i = 0; i < addrsize && match; ++i) {
u32 mask = imask ? imask[i] : 0xffffffffu;
match = ((addr[i] ^ imap[i]) & mask) == 0;
}
for (; i < (addrsize + intsize) && match; ++i) {
u32 mask = imask ? imask[i] : 0xffffffffu;
match =
((intspec[i-addrsize] ^ imap[i]) & mask) == 0;
}
imap += addrsize + intsize;
imaplen -= addrsize + intsize;
DBG(" -> match=%d (imaplen=%d)\n", match, imaplen);
/* Get the interrupt parent */
if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
newpar = of_node_get(of_irq_dflt_pic);
else
newpar = of_find_node_by_phandle((phandle)*imap);
imap++;
--imaplen;
/* Check if not found */
if (newpar == NULL) {
DBG(" -> imap parent not found !\n");
goto fail;
}
/* Get #interrupt-cells and #address-cells of new
* parent
*/
tmp = (u32 *)get_property(newpar, "#interrupt-cells",
NULL);
if (tmp == NULL) {
DBG(" -> parent lacks #interrupt-cells !\n");
goto fail;
}
newintsize = *tmp;
tmp = (u32 *)get_property(newpar, "#address-cells",
NULL);
newaddrsize = (tmp == NULL) ? 0 : *tmp;
DBG(" -> newintsize=%d, newaddrsize=%d\n",
newintsize, newaddrsize);
/* Check for malformed properties */
if (imaplen < (newaddrsize + newintsize))
goto fail;
imap += newaddrsize + newintsize;
imaplen -= newaddrsize + newintsize;
DBG(" -> imaplen=%d\n", imaplen);
}
if (!match)
goto fail;
of_node_put(old);
old = of_node_get(newpar);
addrsize = newaddrsize;
intsize = newintsize;
intspec = imap - intsize;
addr = intspec - addrsize;
skiplevel:
/* Iterate again with new parent */
DBG(" -> new parent: %s\n", newpar ? newpar->full_name : "<>");
of_node_put(ipar);
ipar = newpar;
newpar = NULL;
}
fail:
of_node_put(ipar);
of_node_put(old);
of_node_put(newpar);
return -EINVAL;
}
EXPORT_SYMBOL_GPL(of_irq_map_raw);
#if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)
static int of_irq_map_oldworld(struct device_node *device, int index,
struct of_irq *out_irq)
{
u32 *ints;
int intlen;
/*
* Old machines just have a list of interrupt numbers
* and no interrupt-controller nodes.
*/
ints = (u32 *) get_property(device, "AAPL,interrupts", &intlen);
if (ints == NULL)
return -EINVAL;
intlen /= sizeof(u32);
if (index >= intlen)
return -EINVAL;
out_irq->controller = NULL;
out_irq->specifier[0] = ints[index];
out_irq->size = 1;
return 0;
}
#else /* defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32) */
static int of_irq_map_oldworld(struct device_node *device, int index,
struct of_irq *out_irq)
{
return -EINVAL;
}
#endif /* !(defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)) */
int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq)
{
struct device_node *p;
u32 *intspec, *tmp, intsize, intlen, *addr;
int res;
DBG("of_irq_map_one: dev=%s, index=%d\n", device->full_name, index);
/* OldWorld mac stuff is "special", handle out of line */
if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
return of_irq_map_oldworld(device, index, out_irq);
/* Get the interrupts property */
intspec = (u32 *)get_property(device, "interrupts", &intlen);
if (intspec == NULL)
return -EINVAL;
intlen /= sizeof(u32);
/* Get the reg property (if any) */
addr = (u32 *)get_property(device, "reg", NULL);
/* Look for the interrupt parent. */
p = of_irq_find_parent(device);
if (p == NULL)
return -EINVAL;
/* Get size of interrupt specifier */
tmp = (u32 *)get_property(p, "#interrupt-cells", NULL);
if (tmp == NULL) {
of_node_put(p);
return -EINVAL;
}
intsize = *tmp;
/* Check index */
if ((index + 1) * intsize > intlen)
return -EINVAL;
/* Get new specifier and map it */
res = of_irq_map_raw(p, intspec + index * intsize, addr, out_irq);
of_node_put(p);
return res;
}
EXPORT_SYMBOL_GPL(of_irq_map_one);
int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq)
{
struct device_node *dn, *ppnode;
struct pci_dev *ppdev;
u32 lspec;
u32 laddr[3];
u8 pin;
int rc;
/* Check if we have a device node, if yes, fallback to standard OF
* parsing
*/
dn = pci_device_to_OF_node(pdev);
if (dn)
return of_irq_map_one(dn, 0, out_irq);
/* Ok, we don't, time to have fun. Let's start by building up an
* interrupt spec. we assume #interrupt-cells is 1, which is standard
* for PCI. If you do different, then don't use that routine.
*/
rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin);
if (rc != 0)
return rc;
/* No pin, exit */
if (pin == 0)
return -ENODEV;
/* Now we walk up the PCI tree */
lspec = pin;
for (;;) {
/* Get the pci_dev of our parent */
ppdev = pdev->bus->self;
/* Ouch, it's a host bridge... */
if (ppdev == NULL) {
#ifdef CONFIG_PPC64
ppnode = pci_bus_to_OF_node(pdev->bus);
#else
struct pci_controller *host;
host = pci_bus_to_host(pdev->bus);
ppnode = host ? host->arch_data : NULL;
#endif
/* No node for host bridge ? give up */
if (ppnode == NULL)
return -EINVAL;
} else
/* We found a P2P bridge, check if it has a node */
ppnode = pci_device_to_OF_node(ppdev);
/* Ok, we have found a parent with a device-node, hand over to
* the OF parsing code.
* We build a unit address from the linux device to be used for
* resolution. Note that we use the linux bus number which may
* not match your firmware bus numbering.
* Fortunately, in most cases, interrupt-map-mask doesn't include
* the bus number as part of the matching.
* You should still be careful about that though if you intend
* to rely on this function (you ship a firmware that doesn't
* create device nodes for all PCI devices).
*/
if (ppnode)
break;
/* We can only get here if we hit a P2P bridge with no node,
* let's do standard swizzling and try again
*/
lspec = of_irq_pci_swizzle(PCI_SLOT(pdev->devfn), lspec);
pdev = ppdev;
}
laddr[0] = (pdev->bus->number << 16)
| (pdev->devfn << 8);
laddr[1] = laddr[2] = 0;
return of_irq_map_raw(ppnode, &lspec, laddr, out_irq);
}
EXPORT_SYMBOL_GPL(of_irq_map_pci);