From patchwork Fri Mar 31 11:29:38 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: 13195818 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 B4805C6FD18 for ; Fri, 31 Mar 2023 11:30:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231571AbjCaLaA (ORCPT ); Fri, 31 Mar 2023 07:30:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37444 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231387AbjCaL35 (ORCPT ); Fri, 31 Mar 2023 07:29:57 -0400 Received: from fllv0016.ext.ti.com (fllv0016.ext.ti.com [198.47.19.142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DB84B1D847; Fri, 31 Mar 2023 04:29:55 -0700 (PDT) Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id 32VBTjvi011333; Fri, 31 Mar 2023 06:29:45 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1680262185; bh=qEh4Kg2fsvgH0hG8iUWSIW7Gdg1hBpngzkGLAga/4hs=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=Aogvs6mG/0i0kR4B3O5Ab3pBFVxXKzaYhgZqAzhuSNVkmqQ8+vI2hUx0W5dAMuhU5 nxY9vwu4Ct2Bj00moZ7cBMAeABqQg/gMYtYxhNA+d4SRGQ9tadlPKerhLz53MokJPV kqVllnH6MRPGb5ZCGYbhbb/nRA7PtkddsY83auDM= Received: from DLEE111.ent.ti.com (dlee111.ent.ti.com [157.170.170.22]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 32VBTj98024448 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 31 Mar 2023 06:29:45 -0500 Received: from DLEE108.ent.ti.com (157.170.170.38) by DLEE111.ent.ti.com (157.170.170.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.16; Fri, 31 Mar 2023 06:29:45 -0500 Received: from fllv0040.itg.ti.com (10.64.41.20) by DLEE108.ent.ti.com (157.170.170.38) 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; Fri, 31 Mar 2023 06:29:45 -0500 Received: from fllv0122.itg.ti.com (fllv0122.itg.ti.com [10.247.120.72]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id 32VBTjBM003266; Fri, 31 Mar 2023 06:29:45 -0500 Received: from localhost (a0501179-pc.dhcp.ti.com [10.24.69.114]) by fllv0122.itg.ti.com (8.14.7/8.14.7) with ESMTP id 32VBTioK014979; Fri, 31 Mar 2023 06:29:44 -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 v6 1/4] soc: ti: pruss: Add pruss_get()/put() API Date: Fri, 31 Mar 2023 16:59:38 +0530 Message-ID: <20230331112941.823410-2-danishanwar@ti.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230331112941.823410-1-danishanwar@ti.com> References: <20230331112941.823410-1-danishanwar@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: netdev@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 Reviewed-by: Roger Quadros Reviewed-by: Tony Lindgren Signed-off-by: MD Danish Anwar --- drivers/remoteproc/pru_rproc.c | 2 +- drivers/soc/ti/pruss.c | 64 ++++++++++++++++++- .../{pruss_driver.h => pruss_internal.h} | 7 +- include/linux/remoteproc/pruss.h | 19 ++++++ 4 files changed, 87 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..28b77d715903 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 +32,66 @@ 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. + * + * This API doesn't check if @rproc is valid or not. It is expected the caller + * will have done a pru_rproc_get() on @rproc, before calling this API to make + * sure that @rproc is valid. + * + * 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)