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of/flattree: Eliminate need to provide early_init_dt_scan_chosen_arch

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This patch refactors the early init parsing of the chosen node so that
architectures aren't forced to provide an empty implementation of
early_init_dt_scan_chosen_arch.  Instead, if an architecture wants to
do something different, it can either use a wrapper function around
early_init_dt_scan_chosen(), or it can replace it altogether.

This patch was written in preparation to adding device tree support to
both x86 ad MIPS.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Tested-by: David Daney <ddaney@caviumnetworks.com>
This commit is contained in:
Grant Likely 2010-10-20 11:45:14 -06:00
parent 7096d04221
commit 32c97689c4
4 changed files with 11 additions and 10 deletions
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5
arch/microblaze/kernel/prom.c
View file

@ -42,11 +42,6 @@
#include <asm/sections.h>
#include <asm/pci-bridge.h>
void __init early_init_dt_scan_chosen_arch(unsigned long node)
{
/* No Microblaze specific code here */
}
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
{
memblock_add(base, size);

12
arch/powerpc/kernel/prom.c
View file

@ -363,10 +363,15 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
return 0;
}
void __init early_init_dt_scan_chosen_arch(unsigned long node)
int __init early_init_dt_scan_chosen_ppc(unsigned long node, const char *uname,
int depth, void *data)
{
unsigned long *lprop;
/* Use common scan routine to determine if this is the chosen node */
if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
return 0;
#ifdef CONFIG_PPC64
/* check if iommu is forced on or off */
if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
@ -398,6 +403,9 @@ void __init early_init_dt_scan_chosen_arch(unsigned long node)
if (lprop)
crashk_res.end = crashk_res.start + *lprop - 1;
#endif
/* break now */
return 1;
}
#ifdef CONFIG_PPC_PSERIES
@ -679,7 +687,7 @@ void __init early_init_devtree(void *params)
* device-tree, including the platform type, initrd location and
* size, TCE reserve, and more ...
*/
of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
of_scan_flat_dt(early_init_dt_scan_chosen_ppc, NULL);
/* Scan memory nodes and rebuild MEMBLOCKs */
memblock_init();

2
drivers/of/fdt.c
View file

@ -533,8 +533,6 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
#endif /* CONFIG_CMDLINE */
early_init_dt_scan_chosen_arch(node);
pr_debug("Command line is: %s\n", cmd_line);
/* break now */

2
include/linux/of_fdt.h
View file

@ -72,7 +72,7 @@ extern void *of_get_flat_dt_prop(unsigned long node, const char *name,
unsigned long *size);
extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
extern unsigned long of_get_flat_dt_root(void);
extern void early_init_dt_scan_chosen_arch(unsigned long node);
extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
int depth, void *data);
extern void early_init_dt_check_for_initrd(unsigned long node);