linux-kernel - [PATCH 24/32] Blackfin arch: cache SWRST value at bootup so other things like watchdog can non-destructively query it

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Message-Id: <11797421872382-git-send-email-bryan.wu@analog.com>
Date:	Mon, 21 May 2007 18:09:32 +0800
From:	Bryan Wu <bryan.wu@...log.com>
To:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Cc:	Mike Frysinger <michael.frysinger@...log.com>,
	Bryan Wu <bryan.wu@...log.com>
Subject: [PATCH 24/32] Blackfin arch: cache SWRST value at bootup so other things like watchdog can non-destructively query it

From: Mike Frysinger <michael.frysinger@...log.com>

Signed-off-by: Mike Frysinger <michael.frysinger@...log.com>
Signed-off-by: Bryan Wu <bryan.wu@...log.com>
---
 arch/blackfin/kernel/setup.c       |    8 ++++++++
 include/asm-blackfin/bfin-global.h |    1 +
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index b6ac6f8..02dc743 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 e37f816..57f37cc 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;
-- 
1.5.1.2
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