From patchwork Wed Apr 6 09:43:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Puranjay Mohan X-Patchwork-Id: 12803554 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 1DF92C433F5 for ; Wed, 6 Apr 2022 14:28:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234744AbiDFOaj (ORCPT ); Wed, 6 Apr 2022 10:30:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42178 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234937AbiDFOaU (ORCPT ); Wed, 6 Apr 2022 10:30:20 -0400 Received: from lelv0142.ext.ti.com (lelv0142.ext.ti.com [198.47.23.249]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 38D9447D5AB; Wed, 6 Apr 2022 03:46:30 -0700 (PDT) Received: from fllv0035.itg.ti.com ([10.64.41.0]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 2369iNNw059322; Wed, 6 Apr 2022 04:44:23 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1649238263; bh=3mr6PWWFKPhhqSpWuRBqusywwjTd5CFgavwJj4zaMBI=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=CpC3IY8l4kE8f6xFTLsMq5aYiQaQwh8p3CAEt/ibd5By7p7b2BUC1tBNlE2OaZFLP X87ofzxeY0sUZ55x2Ou5Dz4DLgizb4Jhl0rE/OR/IemH+15EF4Rv/N8fDEYdQT6eEq F+UbMqHDDYgob9SVESZjD3WZjjYzO1v/NwWb+7m4= Received: from DFLE115.ent.ti.com (dfle115.ent.ti.com [10.64.6.36]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 2369iNa5113119 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 6 Apr 2022 04:44:23 -0500 Received: from DFLE108.ent.ti.com (10.64.6.29) by DFLE115.ent.ti.com (10.64.6.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14; Wed, 6 Apr 2022 04:44:22 -0500 Received: from fllv0040.itg.ti.com (10.64.41.20) by DFLE108.ent.ti.com (10.64.6.29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14 via Frontend Transport; Wed, 6 Apr 2022 04:44:22 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id 2369iLLW025792; Wed, 6 Apr 2022 04:44:22 -0500 From: Puranjay Mohan To: CC: , , , , , , , , , , , , , , Subject: [RFC 08/13] soc: ti: pruss: Add pruss_cfg_read()/update() API Date: Wed, 6 Apr 2022 15:13:53 +0530 Message-ID: <20220406094358.7895-9-p-mohan@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220406094358.7895-1-p-mohan@ti.com> References: <20220406094358.7895-1-p-mohan@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: Suman Anna Add two new generic API pruss_cfg_read() and pruss_cfg_update() to the PRUSS platform driver to allow other drivers to read and program respectively a register within the PRUSS CFG sub-module represented by a syscon driver. This interface provides a simple way for client drivers without having them to include and parse the CFG syscon node within their respective device nodes. Various useful registers and macros for certain register bit-fields and their values have also been added. It is the responsibility of the client drivers to reconfigure or reset a particular register upon any failures. Signed-off-by: Suman Anna Co-developed-by: Grzegorz Jaszczyk Signed-off-by: Grzegorz Jaszczyk Signed-off-by: Puranjay Mohan --- drivers/soc/ti/pruss.c | 41 +++++++++++++++++ include/linux/pruss.h | 102 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 143 insertions(+) diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c index bda920662de2..9ef15daa405a 100644 --- a/drivers/soc/ti/pruss.c +++ b/drivers/soc/ti/pruss.c @@ -164,6 +164,47 @@ int pruss_release_mem_region(struct pruss *pruss, } EXPORT_SYMBOL_GPL(pruss_release_mem_region); +/** + * pruss_cfg_read() - read a PRUSS CFG sub-module register + * @pruss: the pruss instance handle + * @reg: register offset within the CFG sub-module + * @val: pointer to return the value in + * + * Reads a given register within the PRUSS CFG sub-module and + * returns it through the passed-in @val pointer + * + * Return: 0 on success, or an error code otherwise + */ +int pruss_cfg_read(struct pruss *pruss, unsigned int reg, unsigned int *val) +{ + if (IS_ERR_OR_NULL(pruss)) + return -EINVAL; + + return regmap_read(pruss->cfg_regmap, reg, val); +} +EXPORT_SYMBOL_GPL(pruss_cfg_read); + +/** + * pruss_cfg_update() - configure a PRUSS CFG sub-module register + * @pruss: the pruss instance handle + * @reg: register offset within the CFG sub-module + * @mask: bit mask to use for programming the @val + * @val: value to write + * + * Programs a given register within the PRUSS CFG sub-module + * + * Return: 0 on success, or an error code otherwise + */ +int pruss_cfg_update(struct pruss *pruss, unsigned int reg, + unsigned int mask, unsigned int val) +{ + if (IS_ERR_OR_NULL(pruss)) + return -EINVAL; + + return regmap_update_bits(pruss->cfg_regmap, reg, mask, val); +} +EXPORT_SYMBOL_GPL(pruss_cfg_update); + static void pruss_of_free_clk_provider(void *data) { struct device_node *clk_mux_np = data; diff --git a/include/linux/pruss.h b/include/linux/pruss.h index 689ef243bcbc..eb2f974eef9c 100644 --- a/include/linux/pruss.h +++ b/include/linux/pruss.h @@ -10,12 +10,99 @@ #ifndef __LINUX_PRUSS_H #define __LINUX_PRUSS_H +#include #include #include #include #define PRU_RPROC_DRVNAME "pru-rproc" +/* + * PRU_ICSS_CFG registers + * SYSCFG, ISRP, ISP, IESP, IECP, SCRP applicable on AMxxxx devices only + */ +#define PRUSS_CFG_REVID 0x00 +#define PRUSS_CFG_SYSCFG 0x04 +#define PRUSS_CFG_GPCFG(x) (0x08 + (x) * 4) +#define PRUSS_CFG_CGR 0x10 +#define PRUSS_CFG_ISRP 0x14 +#define PRUSS_CFG_ISP 0x18 +#define PRUSS_CFG_IESP 0x1C +#define PRUSS_CFG_IECP 0x20 +#define PRUSS_CFG_SCRP 0x24 +#define PRUSS_CFG_PMAO 0x28 +#define PRUSS_CFG_MII_RT 0x2C +#define PRUSS_CFG_IEPCLK 0x30 +#define PRUSS_CFG_SPP 0x34 +#define PRUSS_CFG_PIN_MX 0x40 + +/* PRUSS_GPCFG register bits */ +#define PRUSS_GPCFG_PRU_GPO_SH_SEL BIT(25) + +#define PRUSS_GPCFG_PRU_DIV1_SHIFT 20 +#define PRUSS_GPCFG_PRU_DIV1_MASK GENMASK(24, 20) + +#define PRUSS_GPCFG_PRU_DIV0_SHIFT 15 +#define PRUSS_GPCFG_PRU_DIV0_MASK GENMASK(15, 19) + +#define PRUSS_GPCFG_PRU_GPO_MODE BIT(14) +#define PRUSS_GPCFG_PRU_GPO_MODE_DIRECT 0 +#define PRUSS_GPCFG_PRU_GPO_MODE_SERIAL BIT(14) + +#define PRUSS_GPCFG_PRU_GPI_SB BIT(13) + +#define PRUSS_GPCFG_PRU_GPI_DIV1_SHIFT 8 +#define PRUSS_GPCFG_PRU_GPI_DIV1_MASK GENMASK(12, 8) + +#define PRUSS_GPCFG_PRU_GPI_DIV0_SHIFT 3 +#define PRUSS_GPCFG_PRU_GPI_DIV0_MASK GENMASK(7, 3) + +#define PRUSS_GPCFG_PRU_GPI_CLK_MODE_POSITIVE 0 +#define PRUSS_GPCFG_PRU_GPI_CLK_MODE_NEGATIVE BIT(2) +#define PRUSS_GPCFG_PRU_GPI_CLK_MODE BIT(2) + +#define PRUSS_GPCFG_PRU_GPI_MODE_MASK GENMASK(1, 0) +#define PRUSS_GPCFG_PRU_GPI_MODE_SHIFT 0 + +#define PRUSS_GPCFG_PRU_MUX_SEL_SHIFT 26 +#define PRUSS_GPCFG_PRU_MUX_SEL_MASK GENMASK(29, 26) + +/* PRUSS_MII_RT register bits */ +#define PRUSS_MII_RT_EVENT_EN BIT(0) + +/* PRUSS_SPP register bits */ +#define PRUSS_SPP_XFER_SHIFT_EN BIT(1) +#define PRUSS_SPP_PRU1_PAD_HP_EN BIT(0) + +/* + * enum pruss_gp_mux_sel - PRUSS GPI/O Mux modes for the + * PRUSS_GPCFG0/1 registers + * + * NOTE: The below defines are the most common values, but there + * are some exceptions like on 66AK2G, where the RESERVED and MII2 + * values are interchanged. Also, this bit-field does not exist on + * AM335x SoCs + */ +enum pruss_gp_mux_sel { + PRUSS_GP_MUX_SEL_GP = 0, + PRUSS_GP_MUX_SEL_ENDAT, + PRUSS_GP_MUX_SEL_RESERVED, + PRUSS_GP_MUX_SEL_SD, + PRUSS_GP_MUX_SEL_MII2, + PRUSS_GP_MUX_SEL_MAX, +}; + +/* + * enum pruss_gpi_mode - PRUSS GPI configuration modes, used + * to program the PRUSS_GPCFG0/1 registers + */ +enum pruss_gpi_mode { + PRUSS_GPI_MODE_DIRECT = 0, + PRUSS_GPI_MODE_PARALLEL, + PRUSS_GPI_MODE_28BIT_SHIFT, + PRUSS_GPI_MODE_MII, +}; + /* * enum pruss_pru_id - PRU core identifiers */ @@ -73,6 +160,9 @@ 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); +int pruss_cfg_read(struct pruss *pruss, unsigned int reg, unsigned int *val); +int pruss_cfg_update(struct pruss *pruss, unsigned int reg, + unsigned int mask, unsigned int val); #else @@ -96,6 +186,18 @@ static inline int pruss_release_mem_region(struct pruss *pruss, return -EOPNOTSUPP; } +static inline int pruss_cfg_read(struct pruss *pruss, unsigned int reg, + unsigned int *val) +{ + return -EOPNOTSUPP; +} + +static inline int pruss_cfg_update(struct pruss *pruss, unsigned int reg, + unsigned int mask, unsigned int val) +{ + return -EOPNOTSUPP; +} + #endif /* CONFIG_TI_PRUSS */ #if IS_ENABLED(CONFIG_PRU_REMOTEPROC)