From patchwork Wed Apr 6 23:36:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brad Larson X-Patchwork-Id: 559003 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76B5EC433F5 for ; Wed, 6 Apr 2022 23:37:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238020AbiDFXji (ORCPT ); Wed, 6 Apr 2022 19:39:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59784 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238017AbiDFXjU (ORCPT ); Wed, 6 Apr 2022 19:39:20 -0400 Received: from mail-pg1-x52f.google.com (mail-pg1-x52f.google.com [IPv6:2607:f8b0:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3FE3B200357 for ; Wed, 6 Apr 2022 16:37:19 -0700 (PDT) Received: by mail-pg1-x52f.google.com with SMTP id q142so3467941pgq.9 for ; Wed, 06 Apr 2022 16:37:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pensando.io; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=+NHPrcfPX9j18H1X5A7gd0jrJ/hWGlXT1F/HI7wEXaE=; b=4Kw/aPfSNYshRbULidJg3mB/KOVPMiK0GCp5wH59VS/zYWvSwjEnXicMwj1WCeSWsl ffOVt81BMhOVDBedkEVUwIt96Q5O1IfLGGiBPoWxdTocmpqrvbhuOGg/lJjDx/TPtfDt tX0fbkYLBZN8v7/ZnmjjgYrZhc/Sg1kz4+JGb3v2ZmUz3DMLZAi1OiZxMucAzcIMYeOM RzyVlUG7tkOhpbK3Iee3tmClVejUMAp9Hp4gKWynCvgz/wbZ/gE89L+l26v/wFdsHezn 0DEQFDaANZ04J4sBJUs6nUPand5rN70bCF3EWnGbe1JIMI3JCm+n6fLRR95Zqwm5cOtT J1VQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=+NHPrcfPX9j18H1X5A7gd0jrJ/hWGlXT1F/HI7wEXaE=; b=ewLZimtz0uZAgROLIHnNdlusUb3DnwR598RYNqFeS7Prq1+vXALf00IXBlTf5K5ydn 7f8KNik01rsgCFg3mSie8VZgR6uvc2LhZdwoR1+HDbZozL/sUIO8uschPSxKc3PYsLM1 62a/ziA95I154kq4dQN9uoZkgQ5S41sUR58GDGb8reBaGQVjrdW33qy57XSxsC6fNKkp R4SeDYoSFiff3hQxVDHMHmayA/PkDYnxzYdDbCvyprZYdm66GNWsYglEE+b1olhmuwEG AJeWUuV6BaJ3RQNfJrGZv3ZhhnHQ5ZhA9IahY2vYimDuVElfHuhijXtgz5aol2Hyvc/D bQlg== X-Gm-Message-State: AOAM533anoLFA6kcrdjtDPZM7qx541VFw+QMAXZ04ypID2MxtqnTapKE mOu6WhoO8ga/LvMtwhNA3hechQ== X-Google-Smtp-Source: ABdhPJyHjfczh9XOpxfDw4qG22iuv5BhD30drlpa3BlIyG2rSgrDCkxionp7n+48w9BDXCt6rELPcg== X-Received: by 2002:a05:6a00:884:b0:4fe:134d:81cc with SMTP id q4-20020a056a00088400b004fe134d81ccmr11250729pfj.57.1649288238812; Wed, 06 Apr 2022 16:37:18 -0700 (PDT) Received: from platform-dev1.pensando.io ([12.226.153.42]) by smtp.gmail.com with ESMTPSA id m21-20020a17090a7f9500b001c97c6bcaf4sm6903667pjl.39.2022.04.06.16.37.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 Apr 2022 16:37:18 -0700 (PDT) From: Brad Larson To: linux-arm-kernel@lists.infradead.org Cc: arnd@arndb.de, linus.walleij@linaro.org, bgolaszewski@baylibre.com, broonie@kernel.org, fancer.lancer@gmail.com, adrian.hunter@intel.com, ulf.hansson@linaro.org, olof@lixom.net, brad@pensando.io, dac2@pensando.io, linux-gpio@vger.kernel.org, linux-spi@vger.kernel.org, linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 08/11] spi: cadence-quadspi: Add compatible for Pensando Elba SoC Date: Wed, 6 Apr 2022 16:36:45 -0700 Message-Id: <20220406233648.21644-9-brad@pensando.io> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220406233648.21644-1-brad@pensando.io> References: <20220406233648.21644-1-brad@pensando.io> Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org The Pensando Elba SoC has the Cadence QSPI controller integrated. The quirk CQSPI_NEEDS_APB_AHB_HAZARD_WAR is added and if enabled a dummy readback from the controller is performed to ensure synchronization. Signed-off-by: Brad Larson --- Change from V3: - Update due to spi-cadence-quadspi.c changes drivers/spi/spi-cadence-quadspi.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c index b0c9f62ccefb..e7bcd9d8ba37 100644 --- a/drivers/spi/spi-cadence-quadspi.c +++ b/drivers/spi/spi-cadence-quadspi.c @@ -38,6 +38,7 @@ #define CQSPI_DISABLE_DAC_MODE BIT(1) #define CQSPI_SUPPORT_EXTERNAL_DMA BIT(2) #define CQSPI_NO_SUPPORT_WR_COMPLETION BIT(3) +#define CQSPI_NEEDS_APB_AHB_HAZARD_WAR BIT(4) /* Capabilities */ #define CQSPI_SUPPORTS_OCTAL BIT(0) @@ -88,6 +89,7 @@ struct cqspi_st { bool use_dma_read; u32 pd_dev_id; bool wr_completion; + bool apb_ahb_hazard; }; struct cqspi_driver_platdata { @@ -1043,6 +1045,13 @@ static int cqspi_indirect_write_execute(struct cqspi_flash_pdata *f_pdata, if (cqspi->wr_delay) ndelay(cqspi->wr_delay); + /* + * If a hazard exists between the APB and AHB interfaces, perform a + * dummy readback from the controller to ensure synchronization. + */ + if (cqspi->apb_ahb_hazard) + (void)readl(reg_base + CQSPI_REG_INDIRECTWR); + while (remaining > 0) { size_t write_words, mod_bytes; @@ -1759,6 +1768,8 @@ static int cqspi_probe(struct platform_device *pdev) cqspi->use_dma_read = true; if (ddata->quirks & CQSPI_NO_SUPPORT_WR_COMPLETION) cqspi->wr_completion = false; + if (ddata->quirks & CQSPI_NEEDS_APB_AHB_HAZARD_WAR) + cqspi->apb_ahb_hazard = true; if (of_device_is_compatible(pdev->dev.of_node, "xlnx,versal-ospi-1.0")) @@ -1882,6 +1893,10 @@ static const struct cqspi_driver_platdata versal_ospi = { .get_dma_status = cqspi_get_versal_dma_status, }; +static const struct cqspi_driver_platdata pen_cdns_qspi = { + .quirks = CQSPI_NEEDS_APB_AHB_HAZARD_WAR | CQSPI_DISABLE_DAC_MODE, +}; + static const struct of_device_id cqspi_dt_ids[] = { { .compatible = "cdns,qspi-nor", @@ -1907,6 +1922,10 @@ static const struct of_device_id cqspi_dt_ids[] = { .compatible = "intel,socfpga-qspi", .data = (void *)&socfpga_qspi, }, + { + .compatible = "pensando,elba-qspi", + .data = &pen_cdns_qspi, + }, { /* end of table */ } };