[PATCH] powerpc: Add of_parse_dma_window()
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>
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@ -548,3 +548,25 @@ int of_pci_address_to_resource(struct device_node *dev, int bar,
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return __of_address_to_resource(dev, addrp, size, flags, r);
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}
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EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
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void of_parse_dma_window(struct device_node *dn, unsigned char *dma_window_prop,
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unsigned long *busno, unsigned long *phys, unsigned long *size)
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{
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u32 *dma_window, cells;
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unsigned char *prop;
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dma_window = (u32 *)dma_window_prop;
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/* busno is always one cell */
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*busno = *(dma_window++);
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prop = get_property(dn, "ibm,#dma-address-cells", NULL);
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cells = prop ? *(u32 *)prop : prom_n_addr_cells(dn);
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*phys = of_read_addr(dma_window, cells);
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dma_window += cells;
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prop = get_property(dn, "ibm,#dma-size-cells", NULL);
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cells = prop ? *(u32 *)prop : prom_n_size_cells(dn);
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*size = of_read_addr(dma_window, cells);
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}
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@ -230,6 +230,12 @@ extern int of_address_to_resource(struct device_node *dev, int index,
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extern int of_pci_address_to_resource(struct device_node *dev, int bar,
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struct resource *r);
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/* Parse the ibm,dma-window property of an OF node into the busno, phys and
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* size parameters.
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*/
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void of_parse_dma_window(struct device_node *dn, unsigned char *dma_window_prop,
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unsigned long *busno, unsigned long *phys, unsigned long *size);
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extern void kdump_move_device_tree(void);
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#endif /* __KERNEL__ */
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