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authorChristian Mauderer <christian.mauderer@embedded-brains.de>2020-12-14 14:12:21 +0100
committerChristian Mauderer <christian.mauderer@embedded-brains.de>2021-01-21 10:17:31 +0100
commit36b4e8c394cd891e3e8bddefd9eb21ff17cbff46 (patch)
tree4fe2d714170c1b99930a8dc612db10365400313f /bsps/arm/imxrt/include/imxrt/lpspi.h
parentcpukit/spi: Allow driver specific ioctl (diff)
downloadrtems-36b4e8c394cd891e3e8bddefd9eb21ff17cbff46.tar.bz2
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
Diffstat (limited to '')
-rw-r--r--bsps/arm/imxrt/include/imxrt/lpspi.h54
1 files changed, 54 insertions, 0 deletions
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 <sys/ioccom.h>
+
+#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 */