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Commit 613a2f54 authored by Abhimanyu Kapur's avatar Abhimanyu Kapur Committed by Matt Wagantall
Browse files

hvc_dcc: Add support for arm64 cpus 



Split out the architecture debug channel register
reads/writes to arch specifc header files and add
support for arm64 dcc operations.

Change-Id: I48df3a1470760ebaa57eafd5a1f3e8cc9c7bd826
[abhimany: resolve trivial merge conflicts]
Signed-off-by: default avatarAbhimanyu Kapur <abhimany@codeaurora.org>
parent cc5d9689

arch/arm/include/asm/dcc.h

+1 −1
Original line number Diff line number Diff line 
/* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved.

/* Copyright (c) 2012-2014 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

arch/arm64/include/asm/dcc.h

0 → 100644
+41 −0
Original line number Diff line number Diff line 
/* 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.

 */



#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();

}

drivers/tty/hvc/Kconfig

+7 −5
Original line number Diff line number Diff line
@@ -87,13 +87,15 @@ config HVC_UDBG 
	 console for userspace. Do NOT enable in production kernels. 



config HVC_DCC

       bool "ARM JTAG DCC console"

       depends on ARM

       bool "ARM/ARM64 JTAG DCC console"

       depends on ARM || ARM64

       select HVC_DRIVER

       help

         This console uses the JTAG DCC on ARM to create a console under the HVC

	 driver. This console is used through a JTAG only on ARM. If you don't have

	 a JTAG then you probably don't want this option.

         This console uses the JTAG DCC on ARM/ARM64

	 to create a console under the HVC

	 driver. This console is used through a JTAG

	 only on ARM/ARM64. If you don't have a JTAG then

	 you probably don't want this option.



config HVC_BFIN_JTAG

	bool "Blackfin JTAG console"

drivers/tty/hvc/hvc_dcc.c

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
 * GNU General Public License for more details.

 */



#include <linux/console.h>

#include <linux/init.h>



#include <asm/dcc.h>