From patchwork Mon Jul 5 10:16:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Martin_Hundeb=C3=B8ll?= X-Patchwork-Id: 12358713 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0E6EBC11F67 for ; Mon, 5 Jul 2021 10:17:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F12E2613FC for ; Mon, 5 Jul 2021 10:17:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231181AbhGEKTl (ORCPT ); Mon, 5 Jul 2021 06:19:41 -0400 Received: from first.geanix.com ([116.203.34.67]:59040 "EHLO first.geanix.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231124AbhGEKTl (ORCPT ); Mon, 5 Jul 2021 06:19:41 -0400 Received: from zen.. (unknown [185.17.218.86]) by first.geanix.com (Postfix) with ESMTPSA id 929964C5383; Mon, 5 Jul 2021 10:17:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=geanix.com; s=first; t=1625480221; bh=BDjx9hC1kGaSd5HKNtbb9+N06yRJAb3YdFxtDM6AVEE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=f5WKWwt5c6XE2fMGCIefQltiqv83DTHj6+Zs89Yg+Y7HTAt3m8JJ04WppjBgCq5v0 3pXSzlfzxpfGfpl3gHT1Y0A59neGRRekHFWIam0DbwgvlYH09eUj8MJYRJZlPF7Hf4 wEckD/dArKAIEV2anHfuoy4xrGKNIWJmZlbLzMdVVcScCD8K7H9/1+PEUHwHwowMcq JRPfRSqOFInKSf+8O8UiGr6NQ5GRwe26S7toGbgQJ4pHhfB+SaGv7OigLiHf3gEWcy X/oFbJNsJ1UWnxZyBpo7OISR/K45/4l8SwJ5ORr0FY1HivlBOizANHom/i8OtOzSxP Fp1FkAXtNyGkA== From: =?utf-8?q?Martin_Hundeb=C3=B8ll?= To: Wu Hao , Tom Rix , Moritz Fischer , Xu Yilun , Jean Delvare , Guenter Roeck , Lee Jones , Mark Brown Cc: =?utf-8?q?Martin_Hundeb=C3=B8ll?= , linux-fpga@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-spi@vger.kernel.org, Matthew Gerlach Subject: [PATCH v4 1/4] fpga: dfl: expose feature revision from struct dfl_device Date: Mon, 5 Jul 2021 12:16:42 +0200 Message-Id: <20210705101645.2040106-2-martin@geanix.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20210705101645.2040106-1-martin@geanix.com> References: <20210705101645.2040106-1-martin@geanix.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org From: Martin Hundebøll DFL device drivers have a common need for checking feature revision information from the DFL header, as well as other common DFL information like the already exposed feature id and type. This patch exposes the feature revision information directly via the DFL device data structure. Since the DFL core code has already read the DFL header, this this patch saves additional mmio reads from DFL device drivers too. Signed-off-by: Martin Hundebøll Acked-by: Wu Hao Acked-by: Matthew Gerlach --- Changes since v3: * Added Hao's Acked-by * Added Matthew's Acked-by Changes since v2: * Reworded commit message as per Hao's suggestion Changes since v1: * This patch replaces the previous patch 2 and exposes the feature revision through struct dfl_device instead of a helper reading from io-mem drivers/fpga/dfl.c | 27 +++++++++++++++++---------- drivers/fpga/dfl.h | 1 + include/linux/dfl.h | 1 + 3 files changed, 19 insertions(+), 10 deletions(-) diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c index 511b20ff35a3..9381c579d1cd 100644 --- a/drivers/fpga/dfl.c +++ b/drivers/fpga/dfl.c @@ -381,6 +381,7 @@ dfl_dev_add(struct dfl_feature_platform_data *pdata, ddev->type = feature_dev_id_type(pdev); ddev->feature_id = feature->id; + ddev->revision = feature->revision; ddev->cdev = pdata->dfl_cdev; /* add mmio resource */ @@ -717,6 +718,7 @@ struct build_feature_devs_info { */ struct dfl_feature_info { u16 fid; + u8 rev; struct resource mmio_res; void __iomem *ioaddr; struct list_head node; @@ -796,6 +798,7 @@ static int build_info_commit_dev(struct build_feature_devs_info *binfo) /* save resource information for each feature */ feature->dev = fdev; feature->id = finfo->fid; + feature->revision = finfo->rev; /* * the FIU header feature has some fundamental functions (sriov @@ -910,19 +913,17 @@ static void build_info_free(struct build_feature_devs_info *binfo) devm_kfree(binfo->dev, binfo); } -static inline u32 feature_size(void __iomem *start) +static inline u32 feature_size(u64 value) { - u64 v = readq(start + DFH); - u32 ofst = FIELD_GET(DFH_NEXT_HDR_OFST, v); + u32 ofst = FIELD_GET(DFH_NEXT_HDR_OFST, value); /* workaround for private features with invalid size, use 4K instead */ return ofst ? ofst : 4096; } -static u16 feature_id(void __iomem *start) +static u16 feature_id(u64 value) { - u64 v = readq(start + DFH); - u16 id = FIELD_GET(DFH_ID, v); - u8 type = FIELD_GET(DFH_TYPE, v); + u16 id = FIELD_GET(DFH_ID, value); + u8 type = FIELD_GET(DFH_TYPE, value); if (type == DFH_TYPE_FIU) return FEATURE_ID_FIU_HEADER; @@ -1021,10 +1022,15 @@ create_feature_instance(struct build_feature_devs_info *binfo, unsigned int irq_base, nr_irqs; struct dfl_feature_info *finfo; int ret; + u8 rev; + u64 v; + + v = readq(binfo->ioaddr + ofst); + rev = FIELD_GET(DFH_REVISION, v); /* read feature size and id if inputs are invalid */ - size = size ? size : feature_size(binfo->ioaddr + ofst); - fid = fid ? fid : feature_id(binfo->ioaddr + ofst); + size = size ? size : feature_size(v); + fid = fid ? fid : feature_id(v); if (binfo->len - ofst < size) return -EINVAL; @@ -1038,6 +1044,7 @@ create_feature_instance(struct build_feature_devs_info *binfo, return -ENOMEM; finfo->fid = fid; + finfo->rev = rev; finfo->mmio_res.start = binfo->start + ofst; finfo->mmio_res.end = finfo->mmio_res.start + size - 1; finfo->mmio_res.flags = IORESOURCE_MEM; @@ -1166,7 +1173,7 @@ static int parse_feature_private(struct build_feature_devs_info *binfo, { if (!is_feature_dev_detected(binfo)) { dev_err(binfo->dev, "the private feature 0x%x does not belong to any AFU.\n", - feature_id(binfo->ioaddr + ofst)); + feature_id(readq(binfo->ioaddr + ofst))); return -EINVAL; } diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h index 2b82c96ba56c..422157cfd742 100644 --- a/drivers/fpga/dfl.h +++ b/drivers/fpga/dfl.h @@ -243,6 +243,7 @@ struct dfl_feature_irq_ctx { struct dfl_feature { struct platform_device *dev; u16 id; + u8 revision; int resource_index; void __iomem *ioaddr; struct dfl_feature_irq_ctx *irq_ctx; diff --git a/include/linux/dfl.h b/include/linux/dfl.h index 6cc10982351a..431636a0dc78 100644 --- a/include/linux/dfl.h +++ b/include/linux/dfl.h @@ -38,6 +38,7 @@ struct dfl_device { int id; u16 type; u16 feature_id; + u8 revision; struct resource mmio_res; int *irqs; unsigned int num_irqs;