From patchwork Thu Mar 23 06:24:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: MD Danish Anwar X-Patchwork-Id: 13185081 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 36F20C761AF for ; Thu, 23 Mar 2023 06:25:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230197AbjCWGZL (ORCPT ); Thu, 23 Mar 2023 02:25:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54916 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230101AbjCWGZJ (ORCPT ); Thu, 23 Mar 2023 02:25:09 -0400 Received: from lelv0143.ext.ti.com (lelv0143.ext.ti.com [198.47.23.248]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D2A592A16B; Wed, 22 Mar 2023 23:25:06 -0700 (PDT) Received: from fllv0034.itg.ti.com ([10.64.40.246]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id 32N6OuL2051489; Thu, 23 Mar 2023 01:24:57 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1679552697; bh=xE7d4K0rf6Th/xekias/+P1Z+5hBsGTg5MqTnAOKOGU=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=QVux5k4f8X6LnxszEWkTlTvVl/ZNc+bFqQZuhTp0jlu7XUP28aUfhGMqFszPSQRwm 6DHpNXIkQ9Z/KFX7Sa80PPOAEiFCSSu6vSV25mm0Plea/Zlni9z9bcgkWOsGCbAerv s7jZsW10pbqEdsReg1wIQIv392i1BWCuFjy89iwg= Received: from DFLE112.ent.ti.com (dfle112.ent.ti.com [10.64.6.33]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 32N6Ou3h110143 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 23 Mar 2023 01:24:56 -0500 Received: from DFLE106.ent.ti.com (10.64.6.27) by DFLE112.ent.ti.com (10.64.6.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.16; Thu, 23 Mar 2023 01:24:56 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE106.ent.ti.com (10.64.6.27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.16 via Frontend Transport; Thu, 23 Mar 2023 01:24:56 -0500 Received: from lelv0854.itg.ti.com (lelv0854.itg.ti.com [10.181.64.140]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 32N6OumP092564; Thu, 23 Mar 2023 01:24:56 -0500 Received: from localhost (a0501179-pc.dhcp.ti.com [10.24.69.114]) by lelv0854.itg.ti.com (8.14.7/8.14.7) with ESMTP id 32N6Ot4M010555; Thu, 23 Mar 2023 01:24:56 -0500 From: MD Danish Anwar To: "Andrew F. Davis" , Suman Anna , Roger Quadros , Vignesh Raghavendra , Tero Kristo , MD Danish Anwar , Mathieu Poirier , Bjorn Andersson , Santosh Shilimkar , Nishanth Menon CC: , , , , , , Subject: [PATCH v5 1/5] soc: ti: pruss: Add pruss_get()/put() API Date: Thu, 23 Mar 2023 11:54:47 +0530 Message-ID: <20230323062451.2925996-2-danishanwar@ti.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230323062451.2925996-1-danishanwar@ti.com> References: <20230323062451.2925996-1-danishanwar@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org From: Tero Kristo Add two new get and put API, pruss_get() and pruss_put() to the PRUSS platform driver to allow client drivers to request a handle to a PRUSS device. This handle will be used by client drivers to request various operations of the PRUSS platform driver through additional API that will be added in the following patches. The pruss_get() function returns the pruss handle corresponding to a PRUSS device referenced by a PRU remoteproc instance. The pruss_put() is the complimentary function to pruss_get(). Co-developed-by: Suman Anna Signed-off-by: Suman Anna Signed-off-by: Tero Kristo Co-developed-by: Grzegorz Jaszczyk Signed-off-by: Grzegorz Jaszczyk Signed-off-by: Puranjay Mohan Signed-off-by: MD Danish Anwar Reviewed-by: Roger Quadros --- drivers/remoteproc/pru_rproc.c | 2 +- drivers/soc/ti/pruss.c | 60 ++++++++++++++++++- .../{pruss_driver.h => pruss_internal.h} | 7 ++- include/linux/remoteproc/pruss.h | 19 ++++++ 4 files changed, 83 insertions(+), 5 deletions(-) rename include/linux/{pruss_driver.h => pruss_internal.h} (90%) diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c index b76db7fa693d..4ddd5854d56e 100644 --- a/drivers/remoteproc/pru_rproc.c +++ b/drivers/remoteproc/pru_rproc.c @@ -19,7 +19,7 @@ #include #include #include -#include +#include #include #include "remoteproc_internal.h" diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c index 6882c86b3ce5..6c2bb02a521d 100644 --- a/drivers/soc/ti/pruss.c +++ b/drivers/soc/ti/pruss.c @@ -6,6 +6,7 @@ * Author(s): * Suman Anna * Andrew F. Davis + * Tero Kristo */ #include @@ -16,8 +17,9 @@ #include #include #include -#include +#include #include +#include #include /** @@ -30,6 +32,62 @@ struct pruss_private_data { bool has_core_mux_clock; }; +/** + * pruss_get() - get the pruss for a given PRU remoteproc + * @rproc: remoteproc handle of a PRU instance + * + * Finds the parent pruss device for a PRU given the @rproc handle of the + * PRU remote processor. This function increments the pruss device's refcount, + * so always use pruss_put() to decrement it back once pruss isn't needed + * anymore. + * + * Return: pruss handle on success, and an ERR_PTR on failure using one + * of the following error values + * -EINVAL if invalid parameter + * -ENODEV if PRU device or PRUSS device is not found + */ +struct pruss *pruss_get(struct rproc *rproc) +{ + struct pruss *pruss; + struct device *dev; + struct platform_device *ppdev; + + if (IS_ERR_OR_NULL(rproc)) + return ERR_PTR(-EINVAL); + + dev = &rproc->dev; + + /* make sure it is PRU rproc */ + if (!dev->parent || !is_pru_rproc(dev->parent)) + return ERR_PTR(-ENODEV); + + ppdev = to_platform_device(dev->parent->parent); + pruss = platform_get_drvdata(ppdev); + if (!pruss) + return ERR_PTR(-ENODEV); + + get_device(pruss->dev); + + return pruss; +} +EXPORT_SYMBOL_GPL(pruss_get); + +/** + * pruss_put() - decrement pruss device's usecount + * @pruss: pruss handle + * + * Complimentary function for pruss_get(). Needs to be called + * after the PRUSS is used, and only if the pruss_get() succeeds. + */ +void pruss_put(struct pruss *pruss) +{ + if (IS_ERR_OR_NULL(pruss)) + return; + + put_device(pruss->dev); +} +EXPORT_SYMBOL_GPL(pruss_put); + static void pruss_of_free_clk_provider(void *data) { struct device_node *clk_mux_np = data; diff --git a/include/linux/pruss_driver.h b/include/linux/pruss_internal.h similarity index 90% rename from include/linux/pruss_driver.h rename to include/linux/pruss_internal.h index ecfded30ed05..8f91cb164054 100644 --- a/include/linux/pruss_driver.h +++ b/include/linux/pruss_internal.h @@ -6,9 +6,10 @@ * Suman Anna */ -#ifndef _PRUSS_DRIVER_H_ -#define _PRUSS_DRIVER_H_ +#ifndef _PRUSS_INTERNAL_H_ +#define _PRUSS_INTERNAL_H_ +#include #include /* @@ -51,4 +52,4 @@ struct pruss { struct clk *iep_clk_mux; }; -#endif /* _PRUSS_DRIVER_H_ */ +#endif /* _PRUSS_INTERNAL_H_ */ diff --git a/include/linux/remoteproc/pruss.h b/include/linux/remoteproc/pruss.h index 039b50d58df2..93a98cac7829 100644 --- a/include/linux/remoteproc/pruss.h +++ b/include/linux/remoteproc/pruss.h @@ -4,12 +4,14 @@ * * Copyright (C) 2015-2022 Texas Instruments Incorporated - http://www.ti.com * Suman Anna + * Tero Kristo */ #ifndef __LINUX_PRUSS_H #define __LINUX_PRUSS_H #include +#include #include #define PRU_RPROC_DRVNAME "pru-rproc" @@ -44,6 +46,23 @@ enum pru_ctable_idx { struct device_node; struct rproc; +struct pruss; + +#if IS_ENABLED(CONFIG_TI_PRUSS) + +struct pruss *pruss_get(struct rproc *rproc); +void pruss_put(struct pruss *pruss); + +#else + +static inline struct pruss *pruss_get(struct rproc *rproc) +{ + return ERR_PTR(-EOPNOTSUPP); +} + +static inline void pruss_put(struct pruss *pruss) { } + +#endif /* CONFIG_TI_PRUSS */ #if IS_ENABLED(CONFIG_PRU_REMOTEPROC)