arch/arm/src/xmc4: Add SPI support for Infineon XMC45xx microcontroller

arch/arm/src/xmc4/Make.defs

@@ -139,3 +139,7 @@ endif
 ifeq ($(CONFIG_I2C),y)
 CHIP_CSRCS += xmc4_i2c.c
 endif
+
+ifeq ($(CONFIG_XMC4_USCI_SPI),y)
+CHIP_CSRCS += xmc4_spi.c
+endif

arch/arm/src/xmc4/xmc4_spi.h

@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/arm/src/xmc4/xmc4_spi.h
  *
- *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
  *   Author:  Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -42,11 +42,16 @@
 
 #include <nuttx/config.h>
 
-#include "chip/xmc4_spi.h"
+#include "chip/xmc4_usic.h"
 
-/************************************************************************************
+/****************************************************************************
  * Pre-processor Definitions
- ************************************************************************************/
+ ****************************************************************************/
+
+#define XMC4_SPI_MODE0 USIC_BRG_SCLKCFG_NOINVDLY
+#define XMC4_SPI_MODE1 USIC_BRG_SCLKCFG_NOINVNODLY
+#define XMC4_SPI_MODE2 USIC_BRG_SCLKCFG_INVDLY
+#define XMC4_SPI_MODE3 USIC_BRG_SCLKCFG_INVNODLY
 
 #ifndef __ASSEMBLY__
 
@@ -59,59 +64,61 @@ extern "C"
 #define EXTERN extern
 #endif
 
-/************************************************************************************
+/****************************************************************************
  * Public Data
- ************************************************************************************/
+ ****************************************************************************/
 
 struct spi_dev_s;
+enum usic_channel_e;
 
 /****************************************************************************
  * Public Function Prototypes
  ****************************************************************************/
 
-/************************************************************************************
+/****************************************************************************
  * Name: xmc4_spibus_initialize
  *
  * Description:
  *   Initialize the selected SPI bus
  *
- * Input Parameters:
+ * Input Parameter:
- *   bus number (for hardware that has mutiple SPI interfaces)
+ *   channel number (for hardware that has multiple SPI interfaces)
  *
  * Returned Value:
- *   Valid SPI device structure reference on succcess; a NULL on failure
+ *   Valid SPI device structure reference on success; a NULL on failure
  *
- ************************************************************************************/
+ ****************************************************************************/
 
-FAR struct spi_dev_s *xmc4_spibus_initialize(int bus);
+FAR struct spi_dev_s *xmc4_spibus_initialize(int channel);
 
-/************************************************************************************
+/****************************************************************************
  * Name:  xmc4_spi[n]select, xmc4_spi[n]status, and xmc4_spi[n]cmddata
  *
  * Description:
- *   These external functions must be provided by board-specific logic.  They are
+ *   These external functions must be provided by board-specific logic.
- *   implementations of the select, status, and cmddata methods of the SPI interface
+ *   They are implementations of the select, status, and cmddata methods of
- *   defined by struct spi_ops_s (see include/nuttx/spi/spi.h). All other methods
+ *   SPI interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h).
- *   including xmc4_spibus_initialize()) are provided by common Kinetis logic.  To use
+ *   All other methods including xmc4_spibus_initialize()) are provided by
- *   this common SPI logic on your board:
+ *   common XMC4 logic.  To use this common SPI logic on your board:
  *
- *   1. Provide logic in xmc4_board_initialize() to configure SPI chip select
+ *   1. Provide logic in xmc4_board_initialize() to configure SPI chip
- *      pins.
+ *      select pins.
  *   2. Provide xmc4_spi[n]select() and xmc4_spi[n]status() functions
- *      in your board-specific logic.  These functions will perform chip selection
+ *      in your board-specific logic. These functions w/ perform chip
- *      and status operations using GPIOs in the way your board is configured.
+ *      selection and status operations using GPIOs in the way your board
- *   2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide
+ *      is configured.
+ *   3. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide
  *      xmc4_spi[n]cmddata() functions in your board-specific logic.  These
- *      functions will perform cmd/data selection operations using GPIOs in the way
+ *      functions will perform cmd/data selection operations using GPIOs in
- *      your board is configured.
+ *      the way your board is configured.
- *   3. Add a call to xmc4_spibus_initialize() in your low level application
+ *   4. Add a call to xmc4_spibus_initialize() in your low level application
  *      initialization logic
- *   4. The handle returned by xmc4_spibus_initialize() may then be used to bind the
+ *   5. The handle returned by xmc4_spibus_initialize() may then be used to
- *      SPI driver to higher level logic (e.g., calling
+ *      bind the SPI driver to higher level logic (e.g., calling
  *      mmcsd_spislotinitialize(), for example, will bind the SPI driver to
  *      the SPI MMC/SD driver).
  *
- ************************************************************************************/
+ ****************************************************************************/
 
 #ifdef CONFIG_XMC4_SPI0
 void  xmc4_spi0select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected);
@@ -120,6 +127,7 @@ uint8_t xmc4_spi0status(FAR struct spi_dev_s *dev, uint32_t devid);
 int xmc4_spi0cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd);
 #endif
 #endif
+
 #ifdef CONFIG_XMC4_SPI1
 void  xmc4_spi1select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected);
 uint8_t xmc4_spi1status(FAR struct spi_dev_s *dev, uint32_t devid);
@@ -127,6 +135,7 @@ uint8_t xmc4_spi1status(FAR struct spi_dev_s *dev, uint32_t devid);
 int xmc4_spi1cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd);
 #endif
 #endif
+
 #ifdef CONFIG_XMC4_SPI2
 void  xmc4_spi2select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected);
 uint8_t xmc4_spi2status(FAR struct spi_dev_s *dev, uint32_t devid);
@@ -135,11 +144,35 @@ int xmc4_spi2cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd);
 #endif
 #endif
 
+#ifdef CONFIG_XMC4_SPI3
+void  xmc4_spi3select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected);
+uint8_t xmc4_spi3status(FAR struct spi_dev_s *dev, uint32_t devid);
+#ifdef CONFIG_SPI_CMDDATA
+int xmc4_spi3cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd);
+#endif
+#endif
+
+#ifdef CONFIG_XMC4_SPI4
+void  xmc4_spi4select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected);
+uint8_t xmc4_spi4status(FAR struct spi_dev_s *dev, uint32_t devid);
+#ifdef CONFIG_SPI_CMDDATA
+int xmc4_spi4cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd);
+#endif
+#endif
+
+#ifdef CONFIG_XMC4_SPI5
+void  xmc4_spi5select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected);
+uint8_t xmc4_spi5status(FAR struct spi_dev_s *dev, uint32_t devid);
+#ifdef CONFIG_SPI_CMDDATA
+int xmc4_spi5cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd);
+#endif
+#endif
+
 /****************************************************************************
- * Name: ssp_flush
+ * Name: spi_flush
  *
  * Description:
- *   Flush and discard any words left in the RX fifo.  This can be called
+ *   Flush and discard any words left in the RX FIFO.  This can be called
  *   from spi[n]select after a device is deselected (if you worry about such
  *   things).
  *
@@ -155,10 +188,6 @@ int xmc4_spi2cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd);
 #if defined(__cplusplus)
 }
 #endif
-#if defined(CONFIG_XMC4_SPI0) || defined(CONFIG_XMC4_SPI1) || defined(CONFIG_XMC4_SPI2)
-struct spi_dev_s;
-void spi_flush(FAR struct spi_dev_s *dev);
-#endif
 
 #endif /* __ASSEMBLY__ */
 #endif /* __ARCH_ARM_SRC_XMC4_XMC4_SPI_H */