Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752042AbaFPX6c (ORCPT ); Mon, 16 Jun 2014 19:58:32 -0400 Received: from smtp.codeaurora.org ([198.145.11.231]:54768 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750775AbaFPX6a (ORCPT ); Mon, 16 Jun 2014 19:58:30 -0400 From: Abhimanyu Kapur To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, will.deacon@arm.com, catalin.marinas@arm.com Subject: [PATCH] ARM64: TTY: hvc_dcc: Add support for ARM64 dcc Date: Mon, 16 Jun 2014 15:29:38 -0700 Message-Id: <1402957778-13830-1-git-send-email-abhimany@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add support for debug communications channel based hvc console for arm64 cpus. Signed-off-by: Abhimanyu Kapur --- arch/arm64/include/asm/dcc.h | 41 +++++++++++++++++++++++++++++++++++++++++ drivers/tty/hvc/Kconfig | 2 +- 2 files changed, 42 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..ef74324 --- /dev/null +++ b/arch/arm64/include/asm/dcc.h @@ -0,0 +1,41 @@ +/* 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 + +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 8902f9b..02051a1 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 -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/