From patchwork Mon Mar 6 11:09:30 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: 659625 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 68026C678D4 for ; Mon, 6 Mar 2023 11:10:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229901AbjCFLJw (ORCPT ); Mon, 6 Mar 2023 06:09:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52272 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229628AbjCFLJv (ORCPT ); Mon, 6 Mar 2023 06:09:51 -0500 Received: from fllv0015.ext.ti.com (fllv0015.ext.ti.com [198.47.19.141]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AD5D3113C4; Mon, 6 Mar 2023 03:09:49 -0800 (PST) Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 326B9fiA092894; Mon, 6 Mar 2023 05:09:41 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1678100981; bh=wbtrHJq0yZBwh5+dm2EQGu4Qgxoq/nORL21397l0tQk=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=WDYUdpYZjPXfhVm6kwL1O8dNgzdUL5BdORfbsi3eh8d2/Kw3NcdHWFeBLqhnDFWn9 2PicZ1eyYBtZo9iFKpF3efXuGKPwpT8fE/+W82meHnE2lfbX3NDjQfB2kMBoFDLeFd P9FDuXf7W4GGiK8ctzH2dIz1nH6vSKeHuYyRT3Ck= Received: from DFLE113.ent.ti.com (dfle113.ent.ti.com [10.64.6.34]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 326B9fQH030187 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 6 Mar 2023 05:09:41 -0600 Received: from DFLE104.ent.ti.com (10.64.6.25) by DFLE113.ent.ti.com (10.64.6.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.16; Mon, 6 Mar 2023 05:09:41 -0600 Received: from lelv0327.itg.ti.com (10.180.67.183) by DFLE104.ent.ti.com (10.64.6.25) 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; Mon, 6 Mar 2023 05:09:41 -0600 Received: from lelv0854.itg.ti.com (lelv0854.itg.ti.com [10.181.64.140]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id 326B9fVw067085; Mon, 6 Mar 2023 05:09:41 -0600 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 326B9eqq029578; Mon, 6 Mar 2023 05:09:40 -0600 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 v3 2/6] soc: ti: pruss: Add pruss_{request,release}_mem_region() API Date: Mon, 6 Mar 2023 16:39:30 +0530 Message-ID: <20230306110934.2736465-3-danishanwar@ti.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230306110934.2736465-1-danishanwar@ti.com> References: <20230306110934.2736465-1-danishanwar@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From: "Andrew F. Davis" Add two new API - pruss_request_mem_region() & pruss_release_mem_region(), to the PRUSS platform driver to allow client drivers to acquire and release the common memory resources present within a PRU-ICSS subsystem. This allows the client drivers to directly manipulate the respective memories, as per their design contract with the associated firmware. Co-developed-by: Suman Anna Signed-off-by: Suman Anna Signed-off-by: Andrew F. Davis Co-developed-by: Grzegorz Jaszczyk Signed-off-by: Grzegorz Jaszczyk Signed-off-by: MD Danish Anwar --- drivers/soc/ti/pruss.c | 77 ++++++++++++++++++++++++++++++++ include/linux/pruss_driver.h | 27 +++-------- include/linux/remoteproc/pruss.h | 39 ++++++++++++++++ 3 files changed, 121 insertions(+), 22 deletions(-) diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c index a169aa1ed044..c8053c0d735f 100644 --- a/drivers/soc/ti/pruss.c +++ b/drivers/soc/ti/pruss.c @@ -88,6 +88,82 @@ void pruss_put(struct pruss *pruss) } EXPORT_SYMBOL_GPL(pruss_put); +/** + * pruss_request_mem_region() - request a memory resource + * @pruss: the pruss instance + * @mem_id: the memory resource id + * @region: pointer to memory region structure to be filled in + * + * This function allows a client driver to request a memory resource, + * and if successful, will let the client driver own the particular + * memory region until released using the pruss_release_mem_region() + * API. + * + * Return: 0 if requested memory region is available (in such case pointer to + * memory region is returned via @region), an error otherwise + */ +int pruss_request_mem_region(struct pruss *pruss, enum pruss_mem mem_id, + struct pruss_mem_region *region) +{ + if (!pruss || !region || mem_id >= PRUSS_MEM_MAX) + return -EINVAL; + + mutex_lock(&pruss->lock); + + if (pruss->mem_in_use[mem_id]) { + mutex_unlock(&pruss->lock); + return -EBUSY; + } + + *region = pruss->mem_regions[mem_id]; + pruss->mem_in_use[mem_id] = region; + + mutex_unlock(&pruss->lock); + + return 0; +} +EXPORT_SYMBOL_GPL(pruss_request_mem_region); + +/** + * pruss_release_mem_region() - release a memory resource + * @pruss: the pruss instance + * @region: the memory region to release + * + * This function is the complimentary function to + * pruss_request_mem_region(), and allows the client drivers to + * release back a memory resource. + * + * Return: 0 on success, an error code otherwise + */ +int pruss_release_mem_region(struct pruss *pruss, + struct pruss_mem_region *region) +{ + int id; + + if (!pruss || !region) + return -EINVAL; + + mutex_lock(&pruss->lock); + + /* find out the memory region being released */ + for (id = 0; id < PRUSS_MEM_MAX; id++) { + if (pruss->mem_in_use[id] == region) + break; + } + + if (id == PRUSS_MEM_MAX) { + mutex_unlock(&pruss->lock); + return -EINVAL; + } + + pruss->mem_in_use[id] = NULL; + + mutex_unlock(&pruss->lock); + + return 0; +} +EXPORT_SYMBOL_GPL(pruss_release_mem_region); + static void pruss_of_free_clk_provider(void *data) { struct device_node *clk_mux_np = data; @@ -290,6 +366,7 @@ static int pruss_probe(struct platform_device *pdev) return -ENOMEM; pruss->dev = dev; + mutex_init(&pruss->lock); child = of_get_child_by_name(np, "memories"); if (!child) { diff --git a/include/linux/pruss_driver.h b/include/linux/pruss_driver.h index 86242fb5a64a..22b4b37d2536 100644 --- a/include/linux/pruss_driver.h +++ b/include/linux/pruss_driver.h @@ -9,37 +9,18 @@ #ifndef _PRUSS_DRIVER_H_ #define _PRUSS_DRIVER_H_ +#include #include #include -/* - * enum pruss_mem - PRUSS memory range identifiers - */ -enum pruss_mem { - PRUSS_MEM_DRAM0 = 0, - PRUSS_MEM_DRAM1, - PRUSS_MEM_SHRD_RAM2, - PRUSS_MEM_MAX, -}; - -/** - * struct pruss_mem_region - PRUSS memory region structure - * @va: kernel virtual address of the PRUSS memory region - * @pa: physical (bus) address of the PRUSS memory region - * @size: size of the PRUSS memory region - */ -struct pruss_mem_region { - void __iomem *va; - phys_addr_t pa; - size_t size; -}; - /** * struct pruss - PRUSS parent structure * @dev: pruss device pointer * @cfg_base: base iomap for CFG region * @cfg_regmap: regmap for config region * @mem_regions: data for each of the PRUSS memory regions + * @mem_in_use: to indicate if memory resource is in use + * @lock: mutex to serialize access to resources * @core_clk_mux: clk handle for PRUSS CORE_CLK_MUX * @iep_clk_mux: clk handle for PRUSS IEP_CLK_MUX */ @@ -48,6 +29,8 @@ struct pruss { void __iomem *cfg_base; struct regmap *cfg_regmap; struct pruss_mem_region mem_regions[PRUSS_MEM_MAX]; + struct pruss_mem_region *mem_in_use[PRUSS_MEM_MAX]; + struct mutex lock; /* PRU resource lock */ struct clk *core_clk_mux; struct clk *iep_clk_mux; }; diff --git a/include/linux/remoteproc/pruss.h b/include/linux/remoteproc/pruss.h index 93a98cac7829..33f930e0a0ce 100644 --- a/include/linux/remoteproc/pruss.h +++ b/include/linux/remoteproc/pruss.h @@ -44,6 +44,28 @@ enum pru_ctable_idx { PRU_C31, }; +/* + * enum pruss_mem - PRUSS memory range identifiers + */ +enum pruss_mem { + PRUSS_MEM_DRAM0 = 0, + PRUSS_MEM_DRAM1, + PRUSS_MEM_SHRD_RAM2, + PRUSS_MEM_MAX, +}; + +/** + * struct pruss_mem_region - PRUSS memory region structure + * @va: kernel virtual address of the PRUSS memory region + * @pa: physical (bus) address of the PRUSS memory region + * @size: size of the PRUSS memory region + */ +struct pruss_mem_region { + void __iomem *va; + phys_addr_t pa; + size_t size; +}; + struct device_node; struct rproc; struct pruss; @@ -52,6 +74,10 @@ struct pruss; struct pruss *pruss_get(struct rproc *rproc); void pruss_put(struct pruss *pruss); +int pruss_request_mem_region(struct pruss *pruss, enum pruss_mem mem_id, + struct pruss_mem_region *region); +int pruss_release_mem_region(struct pruss *pruss, + struct pruss_mem_region *region); #else @@ -62,6 +88,19 @@ static inline struct pruss *pruss_get(struct rproc *rproc) static inline void pruss_put(struct pruss *pruss) { } +static inline int pruss_request_mem_region(struct pruss *pruss, + enum pruss_mem mem_id, + struct pruss_mem_region *region) +{ + return -EOPNOTSUPP; +} + +static inline int pruss_release_mem_region(struct pruss *pruss, + struct pruss_mem_region *region) +{ + return -EOPNOTSUPP; +} + #endif /* CONFIG_TI_PRUSS */ #if IS_ENABLED(CONFIG_PRU_REMOTEPROC)