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[PATCH] powerpc: Add of_parse_dma_window()

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Add a function for generic parsing of dma-window properties (ie,
ibm,dma-window and ibm,my-dma-window) of pci and virtual device nodes.

This function will also be used by cell.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Jeremy Kerr 2006-05-18 18:05:15 +10:00 committed by Paul Mackerras
parent 8ae5b2801a
commit d4ad66faec
2 changed files with 28 additions and 0 deletions
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22
arch/powerpc/kernel/prom_parse.c
View File

@ -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);
}

6
include/asm-powerpc/prom.h
View File

@ -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__ */