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

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>

diff --git a/cpu/mpc85xx/fdt.c b/cpu/mpc85xx/fdt.c
index 8366379ab60f8a4518f1d9a08d3aa98401322487..723f473dabfdc5c6d760edc797f0064304f8f0f4 100644 (file)
--- a/cpu/mpc85xx/fdt.c
+++ b/cpu/mpc85xx/fdt.c
@@ -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);
 

diff --git a/cpu/mpc86xx/fdt.c b/cpu/mpc86xx/fdt.c
index a36ee30c3f0d1b8196378bb8d4af5af53b16923e..51f3f4c2203ba6f1d18d3cbe917b76ac614d1aa7 100644 (file)
--- a/cpu/mpc86xx/fdt.c
+++ b/cpu/mpc86xx/fdt.c
@@ -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);
 }

diff --git a/cpu/mpc8xxx/Makefile b/cpu/mpc8xxx/Makefile
index 5cb6814403d1c8a4504625941a795188633b7807..481f9e541dcfbcf1b9dd37cd71909e9dc09ab84f 100644 (file)
--- a/cpu/mpc8xxx/Makefile
+++ b/cpu/mpc8xxx/Makefile
@@ -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)

diff --git a/cpu/mpc8xxx/fdt.c b/cpu/mpc8xxx/fdt.c
new file mode 100644 (file)
index 0000000..3a9b584
--- /dev/null
+++ b/cpu/mpc8xxx/fdt.c
@@ -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);
+}