From patchwork Fri Feb 20 18:01:01 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Maxime Coquelin X-Patchwork-Id: 442100 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id E29C6140161 for ; Sat, 21 Feb 2015 05:08:27 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932435AbbBTSIE (ORCPT ); Fri, 20 Feb 2015 13:08:04 -0500 Received: from mail-wi0-f194.google.com ([209.85.212.194]:35029 "EHLO mail-wi0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754265AbbBTSBg (ORCPT ); Fri, 20 Feb 2015 13:01:36 -0500 Received: by mail-wi0-f194.google.com with SMTP id hi2so1793906wib.1; Fri, 20 Feb 2015 10:01:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:subject:date:message-id:in-reply-to:references; bh=eEesxvY7K0NvH+Al+G78Zcq4zDKyGWxWnkSoba2j6lc=; b=pbySv7T9qDcFktLep8e0Br2zDX8kxfxEHWueip1mmNIVeU3N2ylaPpk5ohouyxiDPW TvFQqIWvH/p0scupn1SH/h+V+/D8bTv6KNnOyGjOLpP8ZgWNkazC0hUWNU0CCrsNAZ8f WKefbes9vBj2As/+4sgjFkuKg5JZujo3rWzoiiNUg2OvZvLfDnl5aE6BWJYVnFSWq20Q CCFIheOa8seqGXkLxZnBqPDPaUHt8qLUYrHAhfZHD25M+5I89esAUo/THjXRc7e1akhU QUdgqp6nIaWSz6UEzIMtYpmzum2J2l8lToLA/4z6zLIeUMYG6wjNmyf12JXCxh+9/2kb kG6g== X-Received: by 10.180.19.228 with SMTP id i4mr14100wie.13.1424455293798; Fri, 20 Feb 2015 10:01:33 -0800 (PST) Received: from lmecul0520.st.com. (169.20.90.92.rev.sfr.net. [92.90.20.169]) by mx.google.com with ESMTPSA id hs7sm3398370wib.4.2015.02.20.10.01.30 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 20 Feb 2015 10:01:33 -0800 (PST) From: Maxime Coquelin To: u.kleine-koenig@pengutronix.de, afaerber@suse.de, geert@linux-m68k.org, Rob Herring , Philipp Zabel , Jonathan Corbet , Maxime Coquelin , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Russell King , Daniel Lezcano , Thomas Gleixner , Linus Walleij , Greg Kroah-Hartman , Jiri Slaby , Arnd Bergmann , Andrew Morton , "David S. Miller" , Mauro Carvalho Chehab , Joe Perches , Antti Palosaari , Tejun Heo , Will Deacon , Nikolay Borisov , Rusty Russell , Kees Cook , Michal Marek , linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org, linux-serial@vger.kernel.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH v2 02/18] ARM: ARMv7M: Enlarge vector table to 256 entries Date: Fri, 20 Feb 2015 19:01:01 +0100 Message-Id: <1424455277-29983-3-git-send-email-mcoquelin.stm32@gmail.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1424455277-29983-1-git-send-email-mcoquelin.stm32@gmail.com> References: <1424455277-29983-1-git-send-email-mcoquelin.stm32@gmail.com> Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From Cortex-M reference manuals, the nvic supports up to 240 interrupts. So the number of entries in vectors table is up to 256. This patch adds a new config flag to specify the number of external interrupts. Some ifdeferies are added in order to respect the natural alignment without wasting too much space on smaller systems. Signed-off-by: Maxime Coquelin Acked-by: Uwe Kleine-König Acked-by: Stefan Agner --- arch/arm/kernel/entry-v7m.S | 13 +++++++++---- arch/arm/mm/Kconfig | 15 +++++++++++++++ 2 files changed, 24 insertions(+), 4 deletions(-) diff --git a/arch/arm/kernel/entry-v7m.S b/arch/arm/kernel/entry-v7m.S index 8944f49..68cde36 100644 --- a/arch/arm/kernel/entry-v7m.S +++ b/arch/arm/kernel/entry-v7m.S @@ -117,9 +117,14 @@ ENTRY(__switch_to) ENDPROC(__switch_to) .data - .align 8 +#if CONFIG_CPUV7M_NUM_IRQ <= 112 + .align 9 +#else + .align 10 +#endif + /* - * Vector table (64 words => 256 bytes natural alignment) + * Vector table (Natural alignment need to be ensured) */ ENTRY(vector_table) .long 0 @ 0 - Reset stack pointer @@ -138,6 +143,6 @@ ENTRY(vector_table) .long __invalid_entry @ 13 - Reserved .long __pendsv_entry @ 14 - PendSV .long __invalid_entry @ 15 - SysTick - .rept 64 - 16 - .long __irq_entry @ 16..64 - External Interrupts + .rept CONFIG_CPUV7M_NUM_IRQ + .long __irq_entry @ External Interrupts .endr diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index c43c714..27eb835 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -604,6 +604,21 @@ config CPU_USE_DOMAINS This option enables or disables the use of domain switching via the set_fs() function. +config CPUV7M_NUM_IRQ + int "Number of external interrupts connected to the NVIC" + depends on CPU_V7M + default 90 if ARCH_STM32 + default 38 if ARCH_EFM32 + default 240 + help + This option indicates the number of interrupts connected to the NVIC. + The value can be larger than the real number of interrupts supported + by the system, but must not be lower. + The default value is 240, corresponding to the maximum number of + interrupts supported by the NVIC on Cortex-M family. + + If unsure, keep default value. + # # CPU supports 36-bit I/O #