diff options
| -rw-r--r-- | arch/powerpc/kernel/prom_parse.c | 22 | ||||
| -rw-r--r-- | include/asm-powerpc/prom.h | 6 |
2 files changed, 28 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom_parse.c b/arch/powerpc/kernel/prom_parse.c index 3934c227549..23bb060330e 100644 --- a/arch/powerpc/kernel/prom_parse.c +++ b/arch/powerpc/kernel/prom_parse.c @@ -548,3 +548,25 @@ int of_pci_address_to_resource(struct device_node *dev, int bar, 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); + cells = prop ? *(u32 *)prop : prom_n_addr_cells(dn); + *phys = of_read_addr(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_addr(dma_window, cells); +} diff --git a/include/asm-powerpc/prom.h b/include/asm-powerpc/prom.h index 97ef1cd71a4..c79d58ab744 100644 --- a/include/asm-powerpc/prom.h +++ b/include/asm-powerpc/prom.h @@ -230,6 +230,12 @@ extern int of_address_to_resource(struct device_node *dev, int index, extern int of_pci_address_to_resource(struct device_node *dev, int bar, struct resource *r); +/* Parse the ibm,dma-window property of an OF node into the busno, phys and + * size parameters. + */ +void of_parse_dma_window(struct device_node *dn, unsigned char *dma_window_prop, + unsigned long *busno, unsigned long *phys, unsigned long *size); + extern void kdump_move_device_tree(void); #endif /* __KERNEL__ */ |