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| author | Stephen Rothwell <sfr@canb.auug.org.au> | 2007-05-01 08:26:07 +0200 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2007-07-20 05:28:41 +0200 |
| commit | 97e873e5c8ad8711ce4cca080cff4eb5d21b3aeb (patch) | |
| tree | 7736415a2086522a083392f9ead34dac76c9560c /drivers | |
| parent | Split out common parts of prom.h (diff) | |
| download | linux-97e873e5c8ad8711ce4cca080cff4eb5d21b3aeb.tar.xz linux-97e873e5c8ad8711ce4cca080cff4eb5d21b3aeb.zip | |
Start split out of common open firmware code
This creates drivers/of/base.c (depending on CONFIG_OF) and puts
the first trivially common bits from the prom.c files into it.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Paul Mackerras <paulus@samba.org>
Acked-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/Makefile | 1 | ||||
| -rw-r--r-- | drivers/of/Makefile | 1 | ||||
| -rw-r--r-- | drivers/of/base.c | 65 |
3 files changed, 67 insertions, 0 deletions
diff --git a/drivers/Makefile b/drivers/Makefile index 0ea8e3237c0d..a9e4c5f922a0 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -86,3 +86,4 @@ obj-$(CONFIG_GENERIC_TIME) += clocksource/ obj-$(CONFIG_DMA_ENGINE) += dma/ obj-$(CONFIG_HID) += hid/ obj-$(CONFIG_PPC_PS3) += ps3/ +obj-$(CONFIG_OF) += of/ diff --git a/drivers/of/Makefile b/drivers/of/Makefile new file mode 100644 index 000000000000..cddbe840e30a --- /dev/null +++ b/drivers/of/Makefile @@ -0,0 +1 @@ +obj-y = base.o diff --git a/drivers/of/base.c b/drivers/of/base.c new file mode 100644 index 000000000000..723d80d704e0 --- /dev/null +++ b/drivers/of/base.c @@ -0,0 +1,65 @@ +/* + * Procedures for creating, accessing and interpreting the device tree. + * + * Paul Mackerras August 1996. + * Copyright (C) 1996-2005 Paul Mackerras. + * + * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. + * {engebret|bergner}@us.ibm.com + * + * Adapted for sparc and sparc64 by David S. Miller davem@davemloft.net + * + * Reconsolidated from arch/x/kernel/prom.c by Stephen Rothwell. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ +#include <linux/module.h> +#include <linux/of.h> + +int of_n_addr_cells(struct device_node *np) +{ + const int *ip; + + do { + if (np->parent) + np = np->parent; + ip = of_get_property(np, "#address-cells", NULL); + if (ip) + return *ip; + } while (np->parent); + /* No #address-cells property for the root node */ + return OF_ROOT_NODE_ADDR_CELLS_DEFAULT; +} +EXPORT_SYMBOL(of_n_addr_cells); + +int of_n_size_cells(struct device_node *np) +{ + const int *ip; + + do { + if (np->parent) + np = np->parent; + ip = of_get_property(np, "#size-cells", NULL); + if (ip) + return *ip; + } while (np->parent); + /* No #size-cells property for the root node */ + return OF_ROOT_NODE_SIZE_CELLS_DEFAULT; +} +EXPORT_SYMBOL(of_n_size_cells); + +/* + * Find a property with a given name for a given node + * and return the value. + */ +const void *of_get_property(const struct device_node *np, const char *name, + int *lenp) +{ + struct property *pp = of_find_property(np, name, lenp); + + return pp ? pp->value : NULL; +} +EXPORT_SYMBOL(of_get_property); |