Blackfin arch: cache SWRST value at bootup so other things like watchdog can non-destructively query it

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 9 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index b6ac6f8067b8..02dc74301920 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -43,6 +43,8 @@
 #include <asm/blackfin.h>
 #include <asm/cplbinit.h>
 
+u16 _bfin_swrst;
+
 unsigned long memory_start, memory_end, physical_mem_end;
 unsigned long reserved_mem_dcache_on;
 unsigned long reserved_mem_icache_on;
@@ -381,6 +383,12 @@ void __init setup_arch(char **cmdline_p)
         if (l1_length > L1_DATA_A_LENGTH)
                 panic("L1 memory overflow\n");
 
+#ifdef BF561_FAMILY
+        _bfin_swrst = bfin_read_SICA_SWRST();
+#else
+        _bfin_swrst = bfin_read_SWRST();
+#endif
+
         bf53x_cache_init();
 
         printk(KERN_INFO "Hardware Trace Enabled\n");
diff --git a/include/asm-blackfin/bfin-global.h b/include/asm-blackfin/bfin-global.h
index e37f81609fc3..57f37ccdcdf1 100644
--- a/include/asm-blackfin/bfin-global.h
+++ b/include/asm-blackfin/bfin-global.h
@@ -104,6 +104,7 @@ extern unsigned long dpdt_swapcount_table[];
 
 extern unsigned long table_start, table_end;
 
+extern u16 _bfin_swrst; /* shadow for Software Reset Register (SWRST) */
 extern struct file_operations dpmc_fops;
 extern char _start;
 extern unsigned long _ramstart, _ramend, _rambase;