diff options
Diffstat (limited to 'drivers/of/address.c')
| -rw-r--r-- | drivers/of/address.c | 35 |
1 files changed, 31 insertions, 4 deletions
diff --git a/drivers/of/address.c b/drivers/of/address.c index 7e262a6124c..72e496f1e9b 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -9,8 +9,8 @@ /* 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) +#define OF_CHECK_ADDR_COUNT(na) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS) +#define OF_CHECK_COUNTS(na, ns) (OF_CHECK_ADDR_COUNT(na) && (ns) > 0) static struct of_bus *of_match_bus(struct device_node *np); static int __of_address_to_resource(struct device_node *dev, @@ -69,6 +69,14 @@ static u64 of_bus_default_map(u32 *addr, const __be32 *range, (unsigned long long)cp, (unsigned long long)s, (unsigned long long)da); + /* + * If the number of address cells is larger than 2 we assume the + * mapping doesn't specify a physical address. Rather, the address + * specifies an identifier that must match exactly. + */ + if (na > 2 && memcmp(range, addr, na * 4) != 0) + return OF_BAD_ADDR; + if (da < cp || da >= (cp + s)) return OF_BAD_ADDR; return da - cp; @@ -182,7 +190,7 @@ const __be32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size, } bus->count_cells(dev, &na, &ns); of_node_put(parent); - if (!OF_CHECK_COUNTS(na, ns)) + if (!OF_CHECK_ADDR_COUNT(na)) return NULL; /* Get "reg" or "assigned-addresses" property */ @@ -490,6 +498,25 @@ u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr) } EXPORT_SYMBOL(of_translate_dma_address); +bool of_can_translate_address(struct device_node *dev) +{ + struct device_node *parent; + struct of_bus *bus; + int na, ns; + + parent = of_get_parent(dev); + if (parent == NULL) + return false; + + bus = of_match_bus(parent); + bus->count_cells(dev, &na, &ns); + + of_node_put(parent); + + return OF_CHECK_COUNTS(na, ns); +} +EXPORT_SYMBOL(of_can_translate_address); + const __be32 *of_get_address(struct device_node *dev, int index, u64 *size, unsigned int *flags) { @@ -506,7 +533,7 @@ const __be32 *of_get_address(struct device_node *dev, int index, u64 *size, bus = of_match_bus(parent); bus->count_cells(dev, &na, &ns); of_node_put(parent); - if (!OF_CHECK_COUNTS(na, ns)) + if (!OF_CHECK_ADDR_COUNT(na)) return NULL; /* Get "reg" or "assigned-addresses" property */ |