Subject: [PATCH] ARM64: TTY: hvc_dcc: Add support for ARM64 dcc

From: [email-masked] (Timur Tabi)
Date: Fri, 19 Jun 2015 17:08:54 -0500

From: Abhimanyu Kapur <[email-masked]>

Add support for debug communications channel based
hvc console for arm64 cpus.

Signed-off-by: Abhimanyu Kapur <[email-masked]>
Signed-off-by: Timur Tabi <[email-masked]>
---
 arch/arm64/include/asm/dcc.h | 49 ++++++++++++++++++++++++++++++++++++++++++++
 drivers/tty/hvc/Kconfig      |  2 +-
 2 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/include/asm/dcc.h

diff --git a/arch/arm64/include/asm/dcc.h b/arch/arm64/include/asm/dcc.h
new file mode 100644
index 0000000..f038d61
--- /dev/null
+++ b/arch/arm64/include/asm/dcc.h
@@ -0,0 +1,49 @@
+/* Copyright (c) 2014 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.
+ *
+ * A call to __dcc_getchar() or __dcc_putchar() is typically followed by
+ * a call to __dcc_getstatus().  We want to make sure that the CPU does
+ * not speculative read the DCC status before executing the read or write
+ * instruction.  That's what the ISBs are for.
+ *
+ * The 'volatile' ensures that the compiler does not cache the status bits,
+ * and instead reads the DCC register every time.
+ */
+
+#include <asm/barrier.h>
+
+static inline u32 __dcc_getstatus(void)
+{
+	u32 __ret;
+
+	asm volatile("mrs %0, mdccsr_el0" : "=r" (__ret)
+			: : "cc");
+
+	return __ret;
+}
+
+static inline char __dcc_getchar(void)
+{
+	char __c;
+
+	asm volatile("mrs %0, dbgdtrrx_el0" : "=r" (__c));
+	isb();
+
+	return __c;
+}
+
+static inline void __dcc_putchar(char c)
+{
+	asm volatile("msr dbgdtrtx_el0, %0"
+			: /* No output register */
+			: "r" (c));
+	isb();
+}
diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig
index 2c6883c..9a60d18 100644
--- a/drivers/tty/hvc/Kconfig
+++ b/drivers/tty/hvc/Kconfig
@@ -88,7 +88,7 @@ config HVC_UDBG
 
 config HVC_DCC
        bool "ARM JTAG DCC console"
-       depends on ARM
+       depends on ARM || ARM64
        select HVC_DRIVER
        help
          This console uses the JTAG DCC on ARM to create a console under the HVC
-- 
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