From patchwork Wed Nov 25 10:33:38 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vladimir Murzin X-Patchwork-Id: 7697321 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 5C2539F2E9 for ; Wed, 25 Nov 2015 10:43:08 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 80C8B208DA for ; Wed, 25 Nov 2015 10:43:07 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8A429207DB for ; Wed, 25 Nov 2015 10:43:06 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1a1XVf-0006Bw-ID; Wed, 25 Nov 2015 10:41:11 +0000 Received: from eu-smtp-delivery-143.mimecast.com ([146.101.78.143]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1a1XS2-0001FU-8Z for linux-arm-kernel@lists.infradead.org; Wed, 25 Nov 2015 10:37:37 +0000 Received: from cam-owa2.Emea.Arm.com (fw-tnat.cambridge.arm.com [217.140.96.140]) by eu-smtp-1.mimecast.com with ESMTP id uk-mta-24-Chlkozd8SdiAcTnDzU17wQ-15; Wed, 25 Nov 2015 10:36:18 +0000 Received: from login1.euhpc.arm.com ([10.1.2.79]) by cam-owa2.Emea.Arm.com with Microsoft SMTPSVC(6.0.3790.3959); Wed, 25 Nov 2015 10:35:53 +0000 From: Vladimir Murzin To: arnd@arndb.de, linux@arm.linux.org.uk, gregkh@linuxfoundation.org, daniel.lezcano@linaro.org, tglx@linutronix.de, u.kleine-koenig@pengutronix.de, afaerber@suse.de, mcoquelin.stm32@gmail.com Subject: [RFC PATCH 07/10] ARM: mps2: add low-level debug support Date: Wed, 25 Nov 2015 10:33:38 +0000 Message-Id: <1448447621-17900-8-git-send-email-vladimir.murzin@arm.com> X-Mailer: git-send-email 2.0.0 In-Reply-To: <1448447621-17900-1-git-send-email-vladimir.murzin@arm.com> References: <1448447621-17900-1-git-send-email-vladimir.murzin@arm.com> X-OriginalArrivalTime: 25 Nov 2015 10:35:53.0385 (UTC) FILETIME=[0F680990:01D1276D] X-MC-Unique: Chlkozd8SdiAcTnDzU17wQ-15 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151125_023727_018769_69F9E319 X-CRM114-Status: GOOD ( 10.62 ) X-Spam-Score: -4.2 (----) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark.Rutland@arm.com, devicetree@vger.kernel.org, Pawel.Moll@arm.com, ijc+devicetree@hellion.org.uk, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, linux-serial@vger.kernel.org, galak@codeaurora.org, jslaby@suse.cz, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.8 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add low-level debug support for MPS2, so that earlyprintk can be enabled for debugging early boot issues. Signed-off-by: Vladimir Murzin --- arch/arm/Kconfig.debug | 12 +++++++++++- arch/arm/include/debug/mps2.S | 27 +++++++++++++++++++++++++++ 2 files changed, 38 insertions(+), 1 deletion(-) create mode 100644 arch/arm/include/debug/mps2.S diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 259c0ca..cfbf09a 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -479,6 +479,13 @@ choice Say Y here if you want kernel low-level debugging support on MMP UART3. + config DEBUG_MPS2_UART + bool "Kernel low-level debugging message via MPS2 UART0" + depends on ARCH_MPS2 + help + Say Y here if you want kernel low-level debugging support + on MPS2 based platforms. + config DEBUG_QCOM_UARTDM bool "Kernel low-level debugging messages via QCOM UARTDM" depends on ARCH_QCOM @@ -1350,6 +1357,7 @@ config DEBUG_LL_INCLUDE default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1 default "debug/bcm63xx.S" if DEBUG_UART_BCM63XX default "debug/digicolor.S" if DEBUG_DIGICOLOR_UA0 + default "debug/mps2.S" if DEBUG_MPS2_UART default "mach/debug-macro.S" # Compatibility options for PL01x @@ -1403,6 +1411,7 @@ config DEBUG_UART_PHYS default 0x20068000 if DEBUG_RK29_UART2 || DEBUG_RK3X_UART3 default 0x20201000 if DEBUG_BCM2835 default 0x3e000000 if DEBUG_BCM_KONA_UART + default 0x40004000 if DEBUG_MPS2_UART default 0x4000e400 if DEBUG_LL_UART_EFM32 default 0x40081000 if DEBUG_LPC18XX_UART0 default 0x40090000 if ARCH_LPC32XX @@ -1476,7 +1485,8 @@ config DEBUG_UART_PHYS DEBUG_RMOBILE_SCIFA4 || DEBUG_S3C24XX_UART || \ DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART || \ DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0 || \ - DEBUG_AT91_UART + DEBUG_AT91_UART || \ + DEBUG_MPS2_UART config DEBUG_UART_VIRT hex "Virtual base address of debug UART" diff --git a/arch/arm/include/debug/mps2.S b/arch/arm/include/debug/mps2.S new file mode 100644 index 0000000..0ced0ce --- /dev/null +++ b/arch/arm/include/debug/mps2.S @@ -0,0 +1,27 @@ +/* + * Copyright (C) 2015 ARM Limited + * + * Author: Vladimir Murzin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + + .macro addruart, rp, tmp1, tmp2 + ldr \rp, =CONFIG_DEBUG_UART_PHYS + .endm + + .macro senduart, rd, rx + strb \rd, [\rx] @ Data Register + .endm + + .macro busyuart, rd, rx +1001: ldrb \rd, [\rx, #0x4] @ State Register + tst \rd, #1 @ busy + bne 1001b @ wait until transmit done + .endm + + .macro waituart,rd,rx + .endm