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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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210426_073946_049176_EEE894EC X-CRM114-Status: GOOD ( 22.41 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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);