From patchwork Fri Jan 13 10:50:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hector Martin X-Patchwork-Id: 13100509 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 93AC0C54EBD for ; Fri, 13 Jan 2023 10:56:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=zHEAoBmhHdZPEXYYJZwCehgSqF466GtcIyevoW8P9/4=; b=v79WchoSSN0k+g ht04UwhyP/5OJH829QparrIrBrw+jAmJnXa+0mlyktSHFpiwGLnzjTnZrkYJSQP7zMYQpIYlbyrbE SWjhTkBNPWs9Lw2367Ogbvs5KinHKjxz6eI7Z7g5U2nhpBhgZRBqqlZko3SwIG8IFm0TGHAh7kzAm y5bmOCGdln1GdDkF3ZoKl9hyEXTUG2J1xy9Jk0kHmYtJew+/yopvB6FdOFIlTdaN1Vrpd3DuWlMG0 PKOyk66O+sFesc55npe5LIqHq8u+ZdVuhlDzVHjFGCWLhlBcxWnDV+z6aLg7d375lam6slewiYC8o mZO/MAHV/bJ3KN5zDCKQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pGHiR-001vZH-4B; Fri, 13 Jan 2023 10:55:19 +0000 Received: from marcansoft.com ([212.63.210.85] helo=mail.marcansoft.com) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pGHez-001ttI-6H for linux-arm-kernel@lists.infradead.org; Fri, 13 Jan 2023 10:51:46 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: sendonly@marcansoft.com) by mail.marcansoft.com (Postfix) with ESMTPSA id 2D25841A42; Fri, 13 Jan 2023 10:51:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=marcan.st; s=default; t=1673607096; bh=kZ5l2St5RyPUjKSIYXwu/uDFjCyPWx8nT0BPyLp8JKg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Ae6JuKjU00sx2HlcWmPSHOOZ6+AsJUs2stuywa5lTiHEy/YHVyhuP8cLlNhyfNuDJ dT3X5k/glqXl8aDaTc7iEgvdq3mBUWuTTxrJjvJ0m6ev4ZWmxmuz8KFkN0Yx0nsw+9 8XtaZYbyBtGNF0p4jHFJ6tRhMVlRv36PMWCZ1mDTXZGbdnarK9OQRR6c61JH9fc1Pm WFhv3oJAorH1hQBYSw1Pz6jqdI0Z+T4/gNFmsYCLxPjYyT9gpLvnvIbNfRiJ2+Olq+ HJcQVI4ORIKsrIzTMm2Ksl6Av2ZiazoV589IOT3Y0nMlMuJbZlHhypOuOJK8LXjOGq 4bK0m04MRxKfw== From: Hector Martin To: Joerg Roedel , Will Deacon , Robin Murphy Cc: Sven Peter , Alyssa Rosenzweig , Janne Grunau , Rob Herring , Krzysztof Kozlowski , devicetree@vger.kernel.org, iommu@lists.linux.dev, asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Hector Martin Subject: [PATCH 2/7] iommu: dart: Add suspend/resume support Date: Fri, 13 Jan 2023 19:50:25 +0900 Message-Id: <20230113105029.26654-3-marcan@marcan.st> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230113105029.26654-1-marcan@marcan.st> References: <20230113105029.26654-1-marcan@marcan.st> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230113_025145_428118_C9A6779B X-CRM114-Status: GOOD ( 13.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org We need to save/restore the TCR/TTBR registers, since they are lost on power gate. Reviewed-by: Sven Peter Signed-off-by: Hector Martin --- drivers/iommu/apple-dart.c | 43 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c index 4f4a323be0d0..2458416122f8 100644 --- a/drivers/iommu/apple-dart.c +++ b/drivers/iommu/apple-dart.c @@ -121,6 +121,9 @@ struct apple_dart { struct iommu_group *sid2group[DART_MAX_STREAMS]; struct iommu_device iommu; + + u32 save_tcr[DART_MAX_STREAMS]; + u32 save_ttbr[DART_MAX_STREAMS][DART_MAX_TTBR]; }; /* @@ -932,6 +935,45 @@ static const struct apple_dart_hw apple_dart_hw_t6000 = { .fmt = APPLE_DART2, }; +static __maybe_unused int apple_dart_suspend(struct device *dev) +{ + struct apple_dart *dart = dev_get_drvdata(dev); + unsigned int sid, idx; + + for (sid = 0; sid < DART_MAX_STREAMS; sid++) { + dart->save_tcr[sid] = readl_relaxed(dart->regs + DART_TCR(sid)); + for (idx = 0; idx < DART_MAX_TTBR; idx++) + dart->save_ttbr[sid][idx] = + readl(dart->regs + DART_TTBR(sid, idx)); + } + + return 0; +} + +static __maybe_unused int apple_dart_resume(struct device *dev) +{ + struct apple_dart *dart = dev_get_drvdata(dev); + unsigned int sid, idx; + int ret; + + ret = apple_dart_hw_reset(dart); + if (ret) { + dev_err(dev, "Failed to reset DART on resume\n"); + return ret; + } + + for (sid = 0; sid < DART_MAX_STREAMS; sid++) { + for (idx = 0; idx < DART_MAX_TTBR; idx++) + writel(dart->save_ttbr[sid][idx], + dart->regs + DART_TTBR(sid, idx)); + writel(dart->save_tcr[sid], dart->regs + DART_TCR(sid)); + } + + return 0; +} + +DEFINE_SIMPLE_DEV_PM_OPS(apple_dart_pm_ops, apple_dart_suspend, apple_dart_resume); + static const struct of_device_id apple_dart_of_match[] = { { .compatible = "apple,t8103-dart", .data = &apple_dart_hw_t8103 }, { .compatible = "apple,t6000-dart", .data = &apple_dart_hw_t6000 }, @@ -944,6 +986,7 @@ static struct platform_driver apple_dart_driver = { .name = "apple-dart", .of_match_table = apple_dart_of_match, .suppress_bind_attrs = true, + .pm = pm_sleep_ptr(&apple_dart_pm_ops), }, .probe = apple_dart_probe, .remove = apple_dart_remove,