[RFC] ARM: tty: Move HVC DCC assembly to arch/arm

[Christopher Covington]

Put architecture-specific assembly code where it belongs,
allowing for support of additional architectures such as arm64 in
the future.

Signed-off-by: Christopher Covington <cov at codeaurora.org>
---
 arch/arm/include/asm/dcc.h | 45 +++++++++++++++++++++++++++++++++++++++++++
 drivers/tty/hvc/hvc_dcc.c  | 48 ++--------------------------------------------
 2 files changed, 47 insertions(+), 46 deletions(-)
 create mode 100644 arch/arm/include/asm/dcc.h

diff --git a/arch/arm/include/asm/dcc.h b/arch/arm/include/asm/dcc.h
new file mode 100644
index 0000000..306d1fc
--- /dev/null
+++ b/arch/arm/include/asm/dcc.h
@@ -0,0 +1,45 @@
+/* Copyright (c) 2010, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#include <asm/barrier.h>
+
+/* DCC Status Bits */
+#define DCC_STATUS_RX		(1 << 30)
+#define DCC_STATUS_TX		(1 << 29)
+
+static inline u32 __dcc_getstatus(void)
+{
+	u32 __ret;
+	asm volatile("mrc p14, 0, %0, c0, c1, 0	@ read comms ctrl reg"
+		: "=r" (__ret) : : "cc");
+
+	return __ret;
+}
+
+static inline char __dcc_getchar(void)
+{
+	char __c;
+
+	asm volatile("mrc p14, 0, %0, c0, c5, 0	@ read comms data reg"
+		: "=r" (__c));
+	isb();
+
+	return __c;
+}
+
+static inline void __dcc_putchar(char c)
+{
+	asm volatile("mcr p14, 0, %0, c0, c5, 0	@ write a char"
+		: /* no output register */
+		: "r" (c));
+	isb();
+}
diff --git a/drivers/tty/hvc/hvc_dcc.c b/drivers/tty/hvc/hvc_dcc.c
index 44fbeba..e9f0191 100644
--- a/drivers/tty/hvc/hvc_dcc.c
+++ b/drivers/tty/hvc/hvc_dcc.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+/* Copyright (c) 2010, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -8,57 +8,13 @@
  * 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., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
  */
 
-#include <linux/console.h>
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
-
+#include <asm/dcc.h>
 #include <asm/processor.h>
 
 #include "hvc_console.h"
 
-/* DCC Status Bits */
-#define DCC_STATUS_RX		(1 << 30)
-#define DCC_STATUS_TX		(1 << 29)
-
-static inline u32 __dcc_getstatus(void)
-{
-	u32 __ret;
-	asm volatile("mrc p14, 0, %0, c0, c1, 0	@ read comms ctrl reg"
-		: "=r" (__ret) : : "cc");
-
-	return __ret;
-}
-
-
-static inline char __dcc_getchar(void)
-{
-	char __c;
-
-	asm volatile("mrc p14, 0, %0, c0, c5, 0	@ read comms data reg"
-		: "=r" (__c));
-	isb();
-
-	return __c;
-}
-
-static inline void __dcc_putchar(char c)
-{
-	asm volatile("mcr p14, 0, %0, c0, c5, 0	@ write a char"
-		: /* no output register */
-		: "r" (c));
-	isb();
-}
-
 static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)
 {
 	int i;
-- 
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