From 36b4e8c394cd891e3e8bddefd9eb21ff17cbff46 Mon Sep 17 00:00:00 2001 From: Christian Mauderer Date: Mon, 14 Dec 2020 14:12:21 +0100 Subject: bsps/imxrt: Add ioctl to LPSPI to get registers This allows an application to get the registers of the LPSPI. That is usefull for applications that want to use DMA for a very specialized and highly optimized communication. Update #4180 --- bsps/arm/imxrt/include/imxrt/lpspi.h | 54 ++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 bsps/arm/imxrt/include/imxrt/lpspi.h (limited to 'bsps/arm/imxrt/include/imxrt/lpspi.h') diff --git a/bsps/arm/imxrt/include/imxrt/lpspi.h b/bsps/arm/imxrt/include/imxrt/lpspi.h new file mode 100644 index 0000000000..8a87f28da9 --- /dev/null +++ b/bsps/arm/imxrt/include/imxrt/lpspi.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ + +/* + * Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de) + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef LIBBSP_ARM_IMXRT_IMXRT_LPSPI_H +#define LIBBSP_ARM_IMXRT_IMXRT_LPSPI_H + +#include + +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + +#define IMXRT_LPSPI_IOC_MAGIC 's' + +/** + * @brief Fetch the raw registers. + * + * This allows to do some special operations. Note that if you do something + * fancy, you should lock the hardware by obtaining the bus with the + * SPI_BUS_OBTAIN ioctl first. With that, the normal driver can't be used by + * other tasks. Also note that you should leave the registers in a clean state + * before releasing the bus again. + */ +#define IMXRT_LPSPI_GET_REGISTERS _IOR(IMXRT_LPSPI_IOC_MAGIC, 0, LPSPI_Type *) + +#ifdef __cplusplus +} +#endif /* __cplusplus */ + +#endif /* LIBBSP_ARM_IMXRT_IMXRT_LPSPI_H */ -- cgit v1.2.3