From patchwork Mon Apr 26 14:39:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Patrice CHOTARD X-Patchwork-Id: 12224381 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C419DC43461 for ; Mon, 26 Apr 2021 14:39:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8872061026 for ; Mon, 26 Apr 2021 14:39:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233937AbhDZOkg (ORCPT ); Mon, 26 Apr 2021 10:40:36 -0400 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:25630 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S233919AbhDZOke (ORCPT ); Mon, 26 Apr 2021 10:40:34 -0400 Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 13QEcPVN015854; Mon, 26 Apr 2021 16:39:39 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=selector1; bh=rKQByYKh9iwatTFVoAH76g3JFEZTY9btSBhtfNq13Vo=; b=foxLr38u1jcgz51POaRlVdw6CYaK4m8E91UnNy7i74BUxY2noOnxMQmKCR1gMBwrHB6C dEOwIREZwGAxV0F9vdjFDzbVwvNTAgVBZ4olLYK8erdd6DZtReaq4zvCftzfDJyWnMKA 0vNQeMgtsx/TRQ6jl/9RnuqBz37dG/DE99YPXlaiXPWZw1ltt8KY+KnjvOQtbuZa6L2x jHlxQ6ZBQmH0bfXMmc6Y2EIIuboc9Hp/GGR7q6c45c6FlD4zNFkg0lUaLqxZK6GdsAxz d9LNBabwdq0mALpHntag/e45f4GQR1upRH4aA8zwOVf5UVO+4RjMUL9W/DCT7cdQu59m UA== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 385b0xx7d0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 26 Apr 2021 16:39:39 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id EBDD2100034; Mon, 26 Apr 2021 16:39:38 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id D54332178E6; Mon, 26 Apr 2021 16:39:38 +0200 (CEST) Received: from localhost (10.75.127.48) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 26 Apr 2021 16:39:38 +0200 From: To: Mark Brown , Miquel Raynal , Vignesh Raghavendra , Boris Brezillon , , Alexandre Torgue , , , , CC: , Subject: [PATCH 1/3] spi: spi-mem: add automatic poll status functions Date: Mon, 26 Apr 2021 16:39:32 +0200 Message-ID: <20210426143934.25275-2-patrice.chotard@foss.st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210426143934.25275-1-patrice.chotard@foss.st.com> References: <20210426143934.25275-1-patrice.chotard@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.48] X-ClientProxiedBy: SFHDAG1NODE2.st.com (10.75.127.2) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-04-26_07:2021-04-26,2021-04-26 signatures=0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org From: Christophe Kerello With STM32 QSPI, it is possible to poll the status register of the device. This could be done to offload the CPU during an operation (erase or program a SPI NAND for example). spi_mem_poll_status API has been added to handle this feature. Signed-off-by: Christophe Kerello Signed-off-by: Patrice Chotard --- drivers/spi/spi-mem.c | 34 ++++++++++++++++++++++++++++++++++ include/linux/spi/spi-mem.h | 8 ++++++++ 2 files changed, 42 insertions(+) diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c index 1513553e4080..43dce4b0efa4 100644 --- a/drivers/spi/spi-mem.c +++ b/drivers/spi/spi-mem.c @@ -743,6 +743,40 @@ static inline struct spi_mem_driver *to_spi_mem_drv(struct device_driver *drv) return container_of(drv, struct spi_mem_driver, spidrv.driver); } +/** + * spi_mem_poll_status() - Poll memory device status + * @mem: SPI memory device + * @op: the memory operation to execute + * @mask: status bitmask to ckeck + * @match: status expected value + * @timeout: timeout + * + * This function send a polling status request to the controller driver + * + * Return: 0 in case of success, -ETIMEDOUT in case of error, + * -EOPNOTSUPP if not supported. + */ +int spi_mem_poll_status(struct spi_mem *mem, + const struct spi_mem_op *op, + u8 mask, u8 match, u16 timeout) +{ + struct spi_controller *ctlr = mem->spi->controller; + int ret = -EOPNOTSUPP; + + if (ctlr->mem_ops && ctlr->mem_ops->poll_status) { + ret = spi_mem_access_start(mem); + if (ret) + return ret; + + ret = ctlr->mem_ops->poll_status(mem, op, mask, match, timeout); + + spi_mem_access_end(mem); + } + + return ret; +} +EXPORT_SYMBOL_GPL(spi_mem_poll_status); + static int spi_mem_probe(struct spi_device *spi) { struct spi_mem_driver *memdrv = to_spi_mem_drv(spi->dev.driver); diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h index 2b65c9edc34e..5f78917c0f68 100644 --- a/include/linux/spi/spi-mem.h +++ b/include/linux/spi/spi-mem.h @@ -250,6 +250,7 @@ static inline void *spi_mem_get_drvdata(struct spi_mem *mem) * the currently mapped area), and the caller of * spi_mem_dirmap_write() is responsible for calling it again in * this case. + * @poll_status: poll memory device status * * This interface should be implemented by SPI controllers providing an * high-level interface to execute SPI memory operation, which is usually the @@ -274,6 +275,9 @@ struct spi_controller_mem_ops { u64 offs, size_t len, void *buf); ssize_t (*dirmap_write)(struct spi_mem_dirmap_desc *desc, u64 offs, size_t len, const void *buf); + int (*poll_status)(struct spi_mem *mem, + const struct spi_mem_op *op, + u8 mask, u8 match, u16 timeout); }; /** @@ -369,6 +373,10 @@ devm_spi_mem_dirmap_create(struct device *dev, struct spi_mem *mem, void devm_spi_mem_dirmap_destroy(struct device *dev, struct spi_mem_dirmap_desc *desc); +int spi_mem_poll_status(struct spi_mem *mem, + const struct spi_mem_op *op, + u8 mask, u8 match, u16 timeout); + int spi_mem_driver_register_with_owner(struct spi_mem_driver *drv, struct module *owner);