From patchwork Fri Oct 23 12:44:13 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 7473061 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 [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 85739BEEA4 for ; Fri, 23 Oct 2015 12:46:35 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 725B820923 for ; Fri, 23 Oct 2015 12:46:34 +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 5E01D20919 for ; Fri, 23 Oct 2015 12:46:33 +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 1ZpbiF-0003kW-DP; Fri, 23 Oct 2015 12:44:51 +0000 Received: from mail-wi0-f176.google.com ([209.85.212.176]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Zpbi8-0003Uq-Ul for linux-arm-kernel@lists.infradead.org; Fri, 23 Oct 2015 12:44:47 +0000 Received: by wicll6 with SMTP id ll6so29873931wic.1 for ; Fri, 23 Oct 2015 05:44:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=nN+yMavAdg/93VTF/zFLCZmo2DJAxRc7XEuCUC2OZ1M=; b=Bvy3m72nE0brrWzPCk5kJAzTqAduvPylrwlk4WDiFbwdZRTMov88eFfvDBkr5xnZ9y ieInrygvAcnNk0oOnnooELCKuCfyC7C2S9AyMVarl2Xc3kHmgDuor4H9YiG3i5sXYqSU goz6ueYuUfvTW7QALkwakBSTsDuBpCWh6NYtedtLMukhDdCrv8n5eCbtIX48V18MvSxG b/8ov1aPZPPDv66NEJtTR7GDz4UhrsVxogzT1bWgpWFCTVbPXzlsHtCQ42Pe9izyJ/P7 WlFvpdX4zWGI6e0m4/ntNJKGxQ6SfuREYyJD95QAx/+ZehAS4C6en/Iunfz35NnPrgVY rYow== X-Gm-Message-State: ALoCoQkgM5/BpfmfLHik5qWFWjfI3xDznBssAZn19JJduFlkjjvOKMP1YZTgioyreUHcwPMiZ8KW X-Received: by 10.180.208.41 with SMTP id mb9mr4040614wic.61.1445604263472; Fri, 23 Oct 2015 05:44:23 -0700 (PDT) Received: from gnx2579.home (LMontsouris-657-1-37-90.w80-11.abo.wanadoo.fr. [80.11.198.90]) by smtp.gmail.com with ESMTPSA id kr10sm22531747wjc.25.2015.10.23.05.44.21 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 23 Oct 2015 05:44:22 -0700 (PDT) From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, alex.williamson@redhat.com, b.reynal@virtualopensystems.com, arnd@arndb.de, thomas.lendacky@amd.com, Suravee.Suthikulpanit@amd.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Subject: [PATCH v2] VFIO: platform: reset: AMD xgbe reset module Date: Fri, 23 Oct 2015 14:44:13 +0200 Message-Id: <1445604253-15384-1-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151023_054445_218960_168228B6 X-CRM114-Status: GOOD ( 22.80 ) X-Spam-Score: -2.6 (--) 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: linux-kernel@vger.kernel.org, christoffer.dall@linaro.org, patches@linaro.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=-4.2 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 This patch introduces a module that registers and implements a low-level reset function for the AMD XGBE device. it performs the following actions: - reset the PHY - disable auto-negotiation - disable & clear auto-negotiation IRQ - soft-reset the MAC Those tiny pieces of code are inherited from the native xgbe driver. Signed-off-by: Eric Auger --- Applies on top of [PATCH v3 0/7] VFIO platform reset module rework v1 -> v2: - uses module_vfio_reset_handler macro --- drivers/vfio/platform/reset/Kconfig | 7 ++ drivers/vfio/platform/reset/Makefile | 2 + .../vfio/platform/reset/vfio_platform_amdxgbe.c | 131 +++++++++++++++++++++ 3 files changed, 140 insertions(+) create mode 100644 drivers/vfio/platform/reset/vfio_platform_amdxgbe.c diff --git a/drivers/vfio/platform/reset/Kconfig b/drivers/vfio/platform/reset/Kconfig index 746b96b..ed9bb28 100644 --- a/drivers/vfio/platform/reset/Kconfig +++ b/drivers/vfio/platform/reset/Kconfig @@ -5,3 +5,10 @@ config VFIO_PLATFORM_CALXEDAXGMAC_RESET Enables the VFIO platform driver to handle reset for Calxeda xgmac If you don't know what to do here, say N. +config VFIO_PLATFORM_AMDXGBE_RESET + tristate "VFIO support for AMD XGBE reset" + depends on VFIO_PLATFORM + help + Enables the VFIO platform driver to handle reset for AMD XGBE + + 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 2a486af..93f4e23 100644 --- a/drivers/vfio/platform/reset/Makefile +++ b/drivers/vfio/platform/reset/Makefile @@ -1,5 +1,7 @@ vfio-platform-calxedaxgmac-y := vfio_platform_calxedaxgmac.o +vfio-platform-amdxgbe-y := vfio_platform_amdxgbe.o 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 diff --git a/drivers/vfio/platform/reset/vfio_platform_amdxgbe.c b/drivers/vfio/platform/reset/vfio_platform_amdxgbe.c new file mode 100644 index 0000000..20b530a --- /dev/null +++ b/drivers/vfio/platform/reset/vfio_platform_amdxgbe.c @@ -0,0 +1,131 @@ +/* + * VFIO platform driver specialized for AMD xgbe reset + * reset code is inherited from AMD xgbe native driver + * + * Copyright (c) 2015 Linaro Ltd. + * www.linaro.org + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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 . + */ + +#include +#include +#include +#include +#include +#include + +#include "vfio_platform_private.h" + +#define DRIVER_VERSION "0.1" +#define DRIVER_AUTHOR "Eric Auger " +#define DRIVER_DESC "Reset support for AMD xgbe vfio platform device" + +#define DMA_MR 0x3000 +#define MAC_VR 0x0110 +#define DMA_ISR 0x3008 +#define MAC_ISR 0x00b0 +#define PCS_MMD_SELECT 0xff +#define MDIO_AN_INT 0x8002 +#define MDIO_AN_INTMASK 0x8001 + +static unsigned int xmdio_read(void *ioaddr, unsigned int mmd, + unsigned int reg) +{ + unsigned int mmd_address, value; + + mmd_address = (mmd << 16) | ((reg) & 0xffff); + iowrite32(mmd_address >> 8, ioaddr + (PCS_MMD_SELECT << 2)); + value = ioread32(ioaddr + ((mmd_address & 0xff) << 2)); + return value; +} + +static void xmdio_write(void *ioaddr, unsigned int mmd, + unsigned int reg, unsigned int value) +{ + unsigned int mmd_address; + + mmd_address = (mmd << 16) | ((reg) & 0xffff); + iowrite32(mmd_address >> 8, ioaddr + (PCS_MMD_SELECT << 2)); + iowrite32(value, ioaddr + ((mmd_address & 0xff) << 2)); +} + +int vfio_platform_amdxgbe_reset(struct vfio_platform_device *vdev) +{ + struct vfio_platform_region xgmac_regs = vdev->regions[0]; + struct vfio_platform_region xpcs_regs = vdev->regions[1]; + u32 dma_mr_value, pcs_value, value; + unsigned int count; + + if (!xgmac_regs.ioaddr) { + xgmac_regs.ioaddr = + ioremap_nocache(xgmac_regs.addr, xgmac_regs.size); + if (!xgmac_regs.ioaddr) + return -ENOMEM; + } + if (!xpcs_regs.ioaddr) { + xpcs_regs.ioaddr = + ioremap_nocache(xpcs_regs.addr, xpcs_regs.size); + if (!xpcs_regs.ioaddr) + return -ENOMEM; + } + + /* reset the PHY through MDIO*/ + pcs_value = xmdio_read(xpcs_regs.ioaddr, MDIO_MMD_PCS, MDIO_CTRL1); + pcs_value |= MDIO_CTRL1_RESET; + xmdio_write(xpcs_regs.ioaddr, MDIO_MMD_PCS, MDIO_CTRL1, pcs_value); + + count = 50; + do { + msleep(20); + pcs_value = xmdio_read(xpcs_regs.ioaddr, MDIO_MMD_PCS, + MDIO_CTRL1); + } while ((pcs_value & MDIO_CTRL1_RESET) && --count); + + if (pcs_value & MDIO_CTRL1_RESET) + pr_warn("%s XGBE PHY reset timeout\n", __func__); + + /* disable auto-negotiation */ + value = xmdio_read(xpcs_regs.ioaddr, MDIO_MMD_AN, MDIO_CTRL1); + value &= ~MDIO_AN_CTRL1_ENABLE; + xmdio_write(xpcs_regs.ioaddr, MDIO_MMD_AN, MDIO_CTRL1, value); + + /* disable AN IRQ */ + xmdio_write(xpcs_regs.ioaddr, MDIO_MMD_AN, MDIO_AN_INTMASK, 0); + + /* clear AN IRQ */ + xmdio_write(xpcs_regs.ioaddr, MDIO_MMD_AN, MDIO_AN_INT, 0); + + /* MAC software reset */ + dma_mr_value = ioread32(xgmac_regs.ioaddr + DMA_MR); + dma_mr_value |= 0x1; + iowrite32(dma_mr_value, xgmac_regs.ioaddr + DMA_MR); + + usleep_range(10, 15); + + count = 2000; + while (count-- && (ioread32(xgmac_regs.ioaddr + DMA_MR) & 1)) + usleep_range(500, 600); + + if (!count) + pr_warn("%s MAC SW reset failed\n", __func__); + + return 0; +} + +module_vfio_reset_handler("amd,xgbe-seattle-v1a", vfio_platform_amdxgbe_reset); + +MODULE_VERSION(DRIVER_VERSION); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC);