[U-Boot] [PATCH 3/3 v4] ppc4xx: Add routine to retrieve CPU number

[Adam Graham]

Provide a weak defined routine to retrieve the CPU number for reference boards that have multiple CPU's.  Default behavior is the existing single CPU print output.  Reference boards with multiple CPU's need to provide a board specific routine.  See board/amcc/arches/arches.c for an example.

Signed-off-by: Adam Graham <agraham at amcc.com>
Signed-off-by: Victor Gallardo <vgallardo at amcc.com>
---
  v2:
  - Correct return code of the generic get_cpu_num routine and make the
    return code a defined value.
  v3:
  - Correct tab/spaces in ppc4xx.h
  v4:
  - Fix commit text (line to long)
  - Remove starting underscores from NA_OR_UNKNOWN_CPU

 cpu/ppc4xx/cpu.c |   19 ++++++++++++++++++-
 include/ppc4xx.h |    3 +++
 2 files changed, 21 insertions(+), 1 deletions(-)

diff --git a/cpu/ppc4xx/cpu.c b/cpu/ppc4xx/cpu.c
index bc9335a..67f88f8 100644
--- a/cpu/ppc4xx/cpu.c
+++ b/cpu/ppc4xx/cpu.c
@@ -41,6 +41,18 @@ DECLARE_GLOBAL_DATA_PTR;
 
 void board_reset(void);
 
+/*
+ * To provide an interface to detect CPU number for boards that support
+ * more then one CPU, we implement the "weak" default functions here.
+ *
+ * Returns CPU number
+ */
+int __get_cpu_num(void)
+{
+	return NA_OR_UNKNOWN_CPU;
+}
+int get_cpu_num(void) __attribute__((weak, alias("__get_cpu_num")));
+
 #if defined(CONFIG_405GP) || \
     defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
     defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
@@ -274,8 +286,13 @@ int checkcpu (void)
 #if !defined(CONFIG_IOP480)
 	char addstr[64] = "";
 	sys_info_t sys_info;
+	int cpu_num;
 
-	puts ("CPU:   ");
+	cpu_num = get_cpu_num();
+	if (cpu_num >= 0)
+		printf("CPU%d:  ", cpu_num);
+	else
+		puts("CPU:   ");
 
 	get_sys_info(&sys_info);
 
diff --git a/include/ppc4xx.h b/include/ppc4xx.h
index e216663..61209a7 100644
--- a/include/ppc4xx.h
+++ b/include/ppc4xx.h
@@ -218,4 +218,7 @@ static inline void set_mcsr(u32 val)
 
 #endif	/* __ASSEMBLY__ */
 
+/* for multi-cpu support */
+#define NA_OR_UNKNOWN_CPU	-1
+
 #endif	/* __PPC4XX_H__ */
-- 
1.5.5