From patchwork Wed Jun 25 16:18:33 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomasz Figa X-Patchwork-Id: 4421741 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 36499BEEAA for ; Wed, 25 Jun 2014 16:22:03 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5ACE220396 for ; Wed, 25 Jun 2014 16:22:02 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 570232038D for ; Wed, 25 Jun 2014 16:22:01 +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 1WzpvO-0001Oc-GJ; Wed, 25 Jun 2014 16:19:54 +0000 Received: from mailout4.w1.samsung.com ([210.118.77.14]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wzpv8-0001Ac-K3 for linux-arm-kernel@lists.infradead.org; Wed, 25 Jun 2014 16:19:39 +0000 Received: from eucpsbgm2.samsung.com (unknown [203.254.199.245]) by mailout4.w1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0N7Q009WAFZPHP40@mailout4.w1.samsung.com> for linux-arm-kernel@lists.infradead.org; Wed, 25 Jun 2014 17:19:02 +0100 (BST) X-AuditID: cbfec7f5-b7f626d000004b39-7d-53aaf67c46c1 Received: from eusync3.samsung.com ( [203.254.199.213]) by eucpsbgm2.samsung.com (EUCPMTA) with SMTP id B7.A7.19257.C76FAA35; Wed, 25 Jun 2014 17:19:08 +0100 (BST) Received: from AMDC1227.digital.local ([106.116.147.199]) by eusync3.samsung.com (Oracle Communications Messaging Server 7u4-23.01(7.0.4.23.0) 64bit (built Aug 10 2011)) with ESMTPA id <0N7Q00FRPFZRTFA0@eusync3.samsung.com>; Wed, 25 Jun 2014 17:19:08 +0100 (BST) From: Tomasz Figa To: linux-samsung-soc@vger.kernel.org Subject: [PATCH 1/2] ARM: firmware: Introduce suspend and resume operations Date: Wed, 25 Jun 2014 18:18:33 +0200 Message-id: <1403713114-18923-2-git-send-email-t.figa@samsung.com> X-Mailer: git-send-email 1.9.3 In-reply-to: <1403713114-18923-1-git-send-email-t.figa@samsung.com> References: <1403713114-18923-1-git-send-email-t.figa@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprDLMWRmVeSWpSXmKPExsVy+t/xq7o131YFG0ybqmfx/eEpVou/k46x W/QuuMpmsenxNVaLy7vmsFnMOL+PyeL2ZV6LtUfuslucuv6ZzeLG9BZWi/UzXrNYrNr1h9GB x6OluYfN4/evSYweO2fdZffYvKTe48qJJlaP3uZ3bB59W1YxenzeJBfAEcVlk5Kak1mWWqRv l8CV0dT0mq2gR6xi5vMWxgbGVqEuRk4OCQETiStnLjFD2GISF+6tZ+ti5OIQEljKKPH8/lRm CKePSeLN7aksIFVsAmoSnxsesYHYIgKqEp/bFrCDFDELrGaWOPW1mR0kISzgLfGteSeYzQJU tHHZWSCbg4NXwEnizfsciG1yEr3b3oBt5hRwltj3ZzNYuRBQyeK+30wTGHkXMDKsYhRNLU0u KE5KzzXSK07MLS7NS9dLzs/dxAgJ0a87GJceszrEKMDBqMTDG8CzKliINbGsuDL3EKMEB7OS CG/Uc6AQb0piZVVqUX58UWlOavEhRiYOTqkGxuOHNKSqMtYviVqWNvvj+zvmxfP/LSsMvbrX db+2xsLb+2xr7wX/CVu7eudhF8aV8b/5L6wPmCRU5ZMQtyo+vetdkqTwk+OdN04kOMaVL+1e 0NF5Of3ldbWLCmEnJubc75w07V7Vn0g263Max7h5tZtVNDvYtoiueMQxZeuJA8F/UhLLj505 8l2JpTgj0VCLuag4EQDRL1B6LwIAAA== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140625_091938_817341_72027879 X-CRM114-Status: GOOD ( 15.20 ) X-Spam-Score: -5.0 (-----) Cc: Kukjin Kim , Russell King - ARM Linux , Arnd Bergmann , Tomasz Figa , linux-kernel@vger.kernel.org, Tomasz Figa , Alexandre Courbot , Olof Johansson , Stephen Warren , linux-arm-kernel@lists.infradead.org, Marek Szyprowski X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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=-1.9 required=5.0 tests=BAYES_00, T_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 This patch extends the firmware_ops structure with two new callbacks: .suspend() and .resume(). The former is intended to ask the firmware to save all its volatile state and suspend the system, without returning back to the kernel in between. The latter is to be called early by very low level platform suspend code after waking up to restore low level hardware state, which can't be restored in non-secure mode. While at it, outdated version of the structure is removed from the documentation and replaced with a reference to the header file. Signed-off-by: Tomasz Figa Acked-by: Alexandre Courbot --- Documentation/arm/firmware.txt | 28 +++++----------------------- arch/arm/include/asm/firmware.h | 8 ++++++++ 2 files changed, 13 insertions(+), 23 deletions(-) diff --git a/Documentation/arm/firmware.txt b/Documentation/arm/firmware.txt index c2e468f..da6713a 100644 --- a/Documentation/arm/firmware.txt +++ b/Documentation/arm/firmware.txt @@ -7,32 +7,14 @@ world, which changes the way some things have to be initialized. This makes a need to provide an interface for such platforms to specify available firmware operations and call them when needed. -Firmware operations can be specified using struct firmware_ops - - struct firmware_ops { - /* - * Enters CPU idle mode - */ - int (*do_idle)(void); - /* - * Sets boot address of specified physical CPU - */ - int (*set_cpu_boot_addr)(int cpu, unsigned long boot_addr); - /* - * Boots specified physical CPU - */ - int (*cpu_boot)(int cpu); - /* - * Initializes L2 cache - */ - int (*l2x0_init)(void); - }; - -and then registered with register_firmware_ops function +Firmware operations can be specified by filling in a struct firmware_ops +with appropriate callbacks and then registering it with register_firmware_ops() +function. void register_firmware_ops(const struct firmware_ops *ops) -the ops pointer must be non-NULL. +The ops pointer must be non-NULL. More information about struct firmware_ops +and its members can be found in arch/arm/include/asm/firmware.h header. There is a default, empty set of operations provided, so there is no need to set anything if platform does not require firmware operations. diff --git a/arch/arm/include/asm/firmware.h b/arch/arm/include/asm/firmware.h index 2c9f10d..5904f59 100644 --- a/arch/arm/include/asm/firmware.h +++ b/arch/arm/include/asm/firmware.h @@ -41,6 +41,14 @@ struct firmware_ops { * Initializes L2 cache */ int (*l2x0_init)(void); + /* + * Enter system-wide suspend. + */ + int (*suspend)(void); + /* + * Restore state of privileged hardware after system-wide suspend. + */ + int (*resume)(void); }; /* Global pointer for current firmware_ops structure, can't be NULL. */