powerpc/mpic: Add get_version API both for internal and external use

MPIC version is useful information for both mpic_alloc() and mpic_init().
The patch provide an API to get MPIC version for reusing the code.
Also, some other IP block may need MPIC version for their own use.
The API for external use is also provided.

This function had been previously added but was removed by commit
5e86bfde9cd93f2 ("powerpc/mpic: remove unused functions") due to the
lack of a user.  This function will be used by "powerpc/mpic: Add
get_version API both for internal and external use".

Signed-off-by: Jia Hongtao <hongtao.jia@freescale.com>
Signed-off-by: Li Yang <leoli@freescale.com>
[scottwood@freescale.com: changelog update]
Signed-off-by: Scott Wood <scottwood@freescale.com>

2 files changed, 13 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/mpic.h b/arch/powerpc/include/asm/mpic.h
index 6ce63a7662f8..98697611e7b3 100644
--- a/arch/powerpc/include/asm/mpic.h
+++ b/arch/powerpc/include/asm/mpic.h
@@ -391,6 +391,9 @@ extern struct bus_type mpic_subsys;
 #define MPIC_REGSET_STANDARD            MPIC_REGSET(0)  /* Original MPIC */
 #define MPIC_REGSET_TSI108              MPIC_REGSET(1)  /* Tsi108/109 PIC */
 
+/* Get the version of primary MPIC */
+extern u32 fsl_mpic_primary_get_version(void);
+
 /* Allocate the controller structure and setup the linux irq descs
  * for the range if interrupts passed in. No HW initialization is
  * actually performed.
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index f72b592d60cc..2c817a736b77 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -1219,6 +1219,16 @@ static u32 fsl_mpic_get_version(struct mpic *mpic)
  * Exported functions
  */
 
+u32 fsl_mpic_primary_get_version(void)
+{
+        struct mpic *mpic = mpic_primary;
+
+        if (mpic)
+                return fsl_mpic_get_version(mpic);
+
+        return 0;
+}
+
 struct mpic * __init mpic_alloc(struct device_node *node,
                                 phys_addr_t phys_addr,
                                 unsigned int flags,