From patchwork Thu Jul 20 04:32:34 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anup Patel X-Patchwork-Id: 9853751 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DBD4760388 for ; Thu, 20 Jul 2017 04:34:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C138D2872D for ; Thu, 20 Jul 2017 04:34:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B62E028736; Thu, 20 Jul 2017 04:34:09 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 2F90D2872D for ; Thu, 20 Jul 2017 04:34:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=jf/MtWEabCSo3zHeeLg3dJ/NDMgjR3trAE5v3+3Nx50=; b=TvRjC3qvQjHNa6LX1kIRDsi1kH 5CtabKazXsFZVEUoQh60jnGHYo4rpG8fDgDLN4PHqtX352jIneDXbJI1s2dE76O8Be2IQNsxvalor ytEiFm2igxB6Pxyxvmj+8ZLMF7EyvHpBsmXgSRvsKC+hsaMR82tyBPxA5M3CoeZIY90yr8nTECqml cNdvXBHLr39obEOc4R4S4fB4IIq+kBx9fRLXLvOMhy820CMhzVM8XXeoo4M4VIho2nmHNVGhSeeMp TZZUaAEepVfJPvXjYtw4LGfq8i1HVjOJ5P9a/XbeoP4Ns+jyw3lHmL2NTfxuMocmN+ZhTcoNohl4P eXBo5Igg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dY3A4-0000Ws-0L; Thu, 20 Jul 2017 04:34:04 +0000 Received: from mail-qk0-x230.google.com ([2607:f8b0:400d:c09::230]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1dY39X-0008Mi-EU for linux-arm-kernel@lists.infradead.org; Thu, 20 Jul 2017 04:33:40 +0000 Received: by mail-qk0-x230.google.com with SMTP id g6so8827683qkf.5 for ; Wed, 19 Jul 2017 21:33:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=nvw0YujcQjLLuL/T32hshTRUnmF1qycYwTDxdChXK0k=; b=Du3ib4C9hdTNf/MH8bGuHY4OzPsv0Y60qka7Sps9vxfj95+K9NNOF0UAiPD3KApJsp Erzev8TBABMWVUBL0j0sobjCK9/08UsKa/+zM4/8uOmo2+wWxT+Crx8adv22MoIxFtTs PZ4oaobhhXQwMchGdApeg+1BV6/LzAZMV13G8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=nvw0YujcQjLLuL/T32hshTRUnmF1qycYwTDxdChXK0k=; b=MVDAf8t17XG8fXXZxV3BZq49vINqGqv4zlLIiPMCIxThvXzHjmfvzaD4PGiorKDNBv yOaHyDaG9j8YM2145aHi3yOT7Ffxa4doktbDDdutV1wvEVa7s+/jdhn+31c0q6B/Xz0U IUBrqwnAR6m3DXAr7s2BoA2QHzpTVqWJZUb5mflfPyWNwoShOp4UaWCcieycBYfWcEP0 KuYE5NgF7QJ5p5UqI1XqD9d02fqkA23npH4yeZBJxLQHS9VRZWJDN6Vfk/O3oww5FW0N KInbfUVbxT4f8RcSbt9Dk8lj7eXdAgd0HeMraTvyS8ceJlI4fo9swvJn+vy+bbhG27gw NZaw== X-Gm-Message-State: AIVw110ni24F2+ituOuU67Z7V+i0dDHA/Q43Kux4e97ZyWZIn9o1DN5K rRF4IPR6dNPnlnJr X-Received: by 10.55.163.69 with SMTP id m66mr3269270qke.139.1500525190070; Wed, 19 Jul 2017 21:33:10 -0700 (PDT) Received: from anup-HP-Compaq-8100-Elite-CMT-PC.dhcp.avagotech.net ([192.19.237.250]) by smtp.gmail.com with ESMTPSA id y3sm1127252qkd.36.2017.07.19.21.33.05 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 19 Jul 2017 21:33:09 -0700 (PDT) From: Anup Patel To: Will Deacon , Robin Murphy , Joerg Roedel , Baptiste Reynal , Alex Williamson Subject: [PATCH v2 2/2] vfio: platform: reset: Add Broadcom FlexRM reset module Date: Thu, 20 Jul 2017 10:02:34 +0530 Message-Id: <1500525154-5200-3-git-send-email-anup.patel@broadcom.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1500525154-5200-1-git-send-email-anup.patel@broadcom.com> References: <1500525154-5200-1-git-send-email-anup.patel@broadcom.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170719_213332_228077_3ACCB069 X-CRM114-Status: GOOD ( 20.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, Scott Branden , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, Anup Patel MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds Broadcom FlexRM low-level reset for VFIO platform. It will do the following: 1. Disable/Deactivate each FlexRM ring 2. Flush each FlexRM ring The cleanup sequence for FlexRM rings is adapted from Broadcom FlexRM mailbox driver. Signed-off-by: Anup Patel Reviewed-by: Oza Oza Reviewed-by: Scott Branden --- drivers/vfio/platform/reset/Kconfig | 9 +++ drivers/vfio/platform/reset/Makefile | 1 + .../vfio/platform/reset/vfio_platform_bcmflexrm.c | 93 ++++++++++++++++++++++ 3 files changed, 103 insertions(+) create mode 100644 drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c diff --git a/drivers/vfio/platform/reset/Kconfig b/drivers/vfio/platform/reset/Kconfig index 70cccc5..8d8d226 100644 --- a/drivers/vfio/platform/reset/Kconfig +++ b/drivers/vfio/platform/reset/Kconfig @@ -13,3 +13,12 @@ config VFIO_PLATFORM_AMDXGBE_RESET Enables the VFIO platform driver to handle reset for AMD XGBE If you don't know what to do here, say N. + +config VFIO_PLATFORM_BCMFLEXRM_RESET + tristate "VFIO support for Broadcom FlexRM reset" + depends on VFIO_PLATFORM + depends on ARCH_BCM_IPROC || COMPILE_TEST + help + Enables the VFIO platform driver to handle reset for Broadcom FlexRM + + If you don't know what to do here, say N. diff --git a/drivers/vfio/platform/reset/Makefile b/drivers/vfio/platform/reset/Makefile index 93f4e23..8d9874b 100644 --- a/drivers/vfio/platform/reset/Makefile +++ b/drivers/vfio/platform/reset/Makefile @@ -5,3 +5,4 @@ ccflags-y += -Idrivers/vfio/platform obj-$(CONFIG_VFIO_PLATFORM_CALXEDAXGMAC_RESET) += vfio-platform-calxedaxgmac.o obj-$(CONFIG_VFIO_PLATFORM_AMDXGBE_RESET) += vfio-platform-amdxgbe.o +obj-$(CONFIG_VFIO_PLATFORM_BCMFLEXRM_RESET) += vfio_platform_bcmflexrm.o diff --git a/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c new file mode 100644 index 0000000..a198196 --- /dev/null +++ b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c @@ -0,0 +1,93 @@ +/* + * Copyright (C) 2017 Broadcom + * + * 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. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +/* + * This driver provides reset support for Broadcom FlexRM ring manager + * to VFIO platform. + */ + +#include +#include +#include +#include +#include + +#include "vfio_platform_private.h" + +/* FlexRM configuration */ +#define RING_REGS_SIZE 0x10000 +#define RING_VER_MAGIC 0x76303031 + +/* Per-Ring register offsets */ +#define RING_VER 0x000 +#define RING_CONTROL 0x034 +#define RING_FLUSH_DONE 0x038 + +/* Register RING_CONTROL fields */ +#define CONTROL_FLUSH_SHIFT 5 +#define CONTROL_ACTIVE_SHIFT 4 + +/* Register RING_FLUSH_DONE fields */ +#define FLUSH_DONE_MASK 0x1 + +static void vfio_platform_bcmflexrm_shutdown(void __iomem *ring) +{ + unsigned int timeout; + + /* Disable/inactivate ring */ + writel_relaxed(0x0, ring + RING_CONTROL); + + /* Flush ring with timeout of 1s */ + timeout = 1000; + writel_relaxed(BIT(CONTROL_FLUSH_SHIFT), ring + RING_CONTROL); + do { + if (readl_relaxed(ring + RING_FLUSH_DONE) & FLUSH_DONE_MASK) + break; + mdelay(1); + } while (timeout--); + + if (!timeout) + pr_warn("VFIO FlexRM shutdown timedout\n"); +} + +static int vfio_platform_bcmflexrm_reset(struct vfio_platform_device *vdev) +{ + void __iomem *ring; + struct vfio_platform_region *reg = &vdev->regions[0]; + + /* Map FlexRM ring registers if not mapped */ + if (!reg->ioaddr) { + reg->ioaddr = ioremap_nocache(reg->addr, reg->size); + if (!reg->ioaddr) + return -ENOMEM; + } + + /* Discover and shutdown each FlexRM ring */ + for (ring = reg->ioaddr; + ring < (reg->ioaddr + reg->size); ring += RING_REGS_SIZE) { + if (readl_relaxed(ring + RING_VER) == RING_VER_MAGIC) + vfio_platform_bcmflexrm_shutdown(ring); + } + + return 0; +} + +module_vfio_reset_handler("brcm,iproc-flexrm-mbox", + vfio_platform_bcmflexrm_reset); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Anup Patel "); +MODULE_DESCRIPTION("Reset support for Broadcom FlexRM VFIO platform device");