arm/beagle: SPI driver

2019-02-25 22:30:09 +00:00
parent 7abc497b6c
commit ecf62845d4
6 changed files with 778 additions and 2 deletions
--- a/bsps/arm/beagle/include/bsp/spi.h
+++ b/bsps/arm/beagle/include/bsp/spi.h
@@ -0,0 +1,144 @@
+/**
+ * @file
+ *
+ * @ingroup arm_beagle
+ *
+ * @brief SPI support API.
+ *
+ * Based on bsps/m68k/gen68360/spi/m360_spi.h
+ */
+
+/*
+ * Copyright (c) 2018 Pierre-Louis Garnier <garnie_a@epita.fr>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef LIBBSP_ARM_BEAGLE_SPI_H
+#define LIBBSP_ARM_BEAGLE_SPI_H
+
+#include <bsp.h>
+#include <rtems/libi2c.h>
+#include <rtems/irq.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#define BBB_SPI_TIMEOUT 1000
+
+#define BBB_SPI_0_BUS_PATH "/dev/spi-0"
+
+#define BBB_SPI_0_IRQ AM335X_INT_SPI0INT
+
+typedef enum {
+  SPI0,
+  SPI1,
+  SPI_COUNT
+} bbb_spi_id_t;
+
+
+
+typedef struct BEAGLE_SPI_BufferDescriptor_ {
+    unsigned short      status;
+    unsigned short      length;
+    volatile void       *buffer;
+} BEAGLE_SPI_BufferDescriptor_t;
+
+typedef struct beagle_spi_softc {
+  int                     initialized;
+  rtems_id                task_id;
+  uintptr_t               regs_base;
+  rtems_vector_number     irq;
+} beagle_spi_softc_t;
+
+typedef struct {
+  rtems_libi2c_bus_t  bus_desc;
+  beagle_spi_softc_t softc;
+} beagle_spi_desc_t;
+
+/*
+ * Initialize the driver
+ *
+ * Returns: o = ok or error code
+ */
+rtems_status_code beagle_spi_init
+(
+ rtems_libi2c_bus_t *bh                  /* bus specifier structure        */
+);
+
+/*
+ * Receive some bytes from SPI device
+ *
+ * Returns: number of bytes received or (negative) error code
+ */
+int beagle_spi_read_bytes
+(
+ rtems_libi2c_bus_t *bh,                 /* bus specifier structure        */
+ unsigned char *buf,                     /* buffer to store bytes          */
+ int len                                 /* number of bytes to receive     */
+);
+
+/*
+ * Send some bytes to SPI device
+ *
+ * Returns: number of bytes sent or (negative) error code
+ */
+int beagle_spi_write_bytes
+(
+ rtems_libi2c_bus_t *bh,                 /* bus specifier structure        */
+ unsigned char *buf,                     /* buffer to send                 */
+ int len                                 /* number of bytes to send        */
+);
+
+/*
+ * Set SPI to desired baudrate/clock mode/character mode
+ *
+ * Returns: rtems_status_code
+ */
+rtems_status_code beagle_spi_set_tfr_mode
+(
+ rtems_libi2c_bus_t *bh,                 /* bus specifier structure        */
+ const rtems_libi2c_tfr_mode_t *tfr_mode /* transfer mode info             */
+);
+
+/*
+ * Perform selected ioctl function for SPI
+ *
+ * Returns: rtems_status_code
+ */
+int beagle_spi_ioctl
+(
+ rtems_libi2c_bus_t *bh,                 /* bus specifier structure        */
+ int                 cmd,                /* ioctl command code             */
+ void               *arg                 /* additional argument array      */
+);
+
+/*
+ * Register SPI bus and devices
+ *
+ * Returns: Bus number or error code
+ */
+rtems_status_code bsp_register_spi
+(
+  const char         *bus_path,
+  uintptr_t           register_base,
+  rtems_vector_number irq
+);
+
+static inline rtems_status_code bbb_register_spi_0(void)
+{
+  return bsp_register_spi(
+    BBB_SPI_0_BUS_PATH,
+    AM335X_SPI0_BASE,
+    BBB_SPI_0_IRQ
+  );
+}
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* LIBBSP_ARM_BEAGLE_SPI_H */