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ppc/85xx/86xx: Device tree fixup for number of cores

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Fixing the number of cores in the device tree based on the actual number of
cores on the system.  With this same device tree image can be used for dual
core and single core members of otherwise exactly same SOC.

For example:
* P2020RDB and P2010RDB
* P1020RDB and P1011RDB
* MPC8641D and MPC8641

Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Poonam Aggrwal 2009-09-02 19:40:36 +05:30 committed by Kumar Gala
parent 58442dc01e
commit f8027f6b47
4 changed files with 61 additions and 0 deletions
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2
cpu/mpc85xx/fdt.c
View file

@ -34,6 +34,7 @@
DECLARE_GLOBAL_DATA_PTR;
extern void ft_qe_setup(void *blob);
extern void ft_fixup_num_cores(void *blob);
#ifdef CONFIG_MP
#include "mp.h"
@ -327,6 +328,7 @@ void ft_cpu_setup(void *blob, bd_t *bd)
#ifdef CONFIG_MP
ft_fixup_cpu(blob, (u64)bd->bi_memstart + (u64)bd->bi_memsize);
#endif
ft_fixup_num_cores(blob);
ft_fixup_cache(blob);

3
cpu/mpc86xx/fdt.c
View file

@ -13,6 +13,8 @@
DECLARE_GLOBAL_DATA_PTR;
extern void ft_fixup_num_cores(void *blob);
void ft_cpu_setup(void *blob, bd_t *bd)
{
#ifdef CONFIG_MP
@ -54,4 +56,5 @@ void ft_cpu_setup(void *blob, bd_t *bd)
if (off < 0)
printf("%s: %s\n", __FUNCTION__, fdt_strerror(off));
#endif
ft_fixup_num_cores(blob);
}

1
cpu/mpc8xxx/Makefile
View file

@ -11,6 +11,7 @@ include $(TOPDIR)/config.mk
LIB = $(obj)lib8xxx.a
COBJS-y += cpu.o
COBJS-$(CONFIG_OF_LIBFDT) += fdt.o
COBJS-$(CONFIG_PCI) += pci_cfg.o
SRCS := $(START:.o=.S) $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)

55
cpu/mpc8xxx/fdt.c Normal file
View file

@ -0,0 +1,55 @@
/*
* Copyright 2009 Freescale Semiconductor, Inc.
*
* This file is derived from cpu/mpc85xx/cpu.c and cpu/mpc86xx/cpu.c.
* Basically this file contains cpu specific common code for 85xx/86xx
* processors.
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <libfdt.h>
#include <fdt_support.h>
void ft_fixup_num_cores(void *blob) {
int off, num_cores, del_cores;
del_cores = 0;
num_cores = cpu_numcores();
off = fdt_node_offset_by_prop_value(blob, -1, "device_type", "cpu", 4);
while (off != -FDT_ERR_NOTFOUND) {
u32 *reg = (u32 *)fdt_getprop(blob, off, "reg", 0);
/* if we find a cpu node outside of what we expect delete it
* and reset the offset back to the start since we can't
* trust the offsets anymore
*/
if (*reg > num_cores-1) {
fdt_del_node(blob, off);
del_cores++;
off = -1;
}
off = fdt_node_offset_by_prop_value(blob, off,
"device_type", "cpu", 4);
}
debug ("%x core system found\n", num_cores);
debug ("deleted %d extra core entry entries from device tree\n",
del_cores);
}