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Commit 638e2226 authored by Abhimanyu Kapur's avatar Abhimanyu Kapur
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
Signed-off-by: default avatarAbhimanyu Kapur <abhimany@codeaurora.org>
parent 609c8181

arch/arm/include/asm/dcc.h

0 → 100644
+42 −0
Original line number Original line Diff line number Diff line 
/* 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

 * 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("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();

}

arch/arm64/include/asm/dcc.h

0 → 100644
+41 −0
Original line number Original line 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 Original line Diff line number Diff line
@@ -87,13 +87,15 @@ config HVC_UDBG 
	 console for userspace. Do NOT enable in production kernels. 

	 console for userspace. Do NOT enable in production kernels. 





config HVC_DCC

config HVC_DCC

       bool "ARM JTAG DCC console"

       bool "ARM/ARM64 JTAG DCC console"

       depends on ARM

       depends on ARM || ARM64

       select HVC_DRIVER

       select HVC_DRIVER

       help

       help

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

         This console uses the JTAG DCC on ARM/ARM64

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

	 to create a console under the HVC

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

	 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

config HVC_BFIN_JTAG

	bool "Blackfin JTAG console"

	bool "Blackfin JTAG console"

drivers/tty/hvc/hvc_dcc.c

+2 −34
Original line number Original line Diff line number Diff line 
/* Copyright (c) 2010, The Linux Foundation. All rights reserved.

/* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved.

 *

 *

 * This program is free software; you can redistribute it and/or modify

 * 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

 * it under the terms of the GNU General Public License version 2 and
@@ -11,12 +11,9 @@ 
 */

 */





#include <linux/console.h>

#include <linux/console.h>

#include <linux/delay.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/init.h>

#include <linux/moduleparam.h>

#include <linux/types.h>





#include <asm/dcc.h>

#include <asm/processor.h>

#include <asm/processor.h>





#include "hvc_console.h"

#include "hvc_console.h"
@@ -25,35 +22,6 @@ 
#define DCC_STATUS_RX		(1 << 30)

#define DCC_STATUS_RX		(1 << 30)

#define DCC_STATUS_TX		(1 << 29)

#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)

static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)

{

{

	int i;

	int i;