New files -- from rtems-LM-980406 which was based on an RTEMS from 12/97.

This was called the dmv170 BSP in that source tree but since the DMV171
is now obsolete, we have transitioned to the DMV177 and have no intention
of checking compatibility with any other models.

1 files changed, 201 insertions, 0 deletions

diff --git a/c/src/lib/libbsp/powerpc/dmv177/console/duart.c b/c/src/lib/libbsp/powerpc/dmv177/console/duart.c
new file mode 100644
index 0000000000..f72b37a832
--- /dev/null
+++ b/c/src/lib/libbsp/powerpc/dmv177/console/duart.c
@@ -0,0 +1,201 @@
+/*
+ *  duart.c
+ *
+ *  This code is a modified version of what you will find at the
+ *  end of the IDP User's manual.  The original code is copyrighted
+ *  by Motorola and Motorola Semiconductor Products as well as
+ *  Motorola Software products group.
+ *  
+ *  Modifications to the original IDP code by Doug McBride, Colorado
+ *  Space Grant College.  Modifications include a means of accessing
+ *  port B of the duart as well as port A as well as modifications for
+ *  buffering and RTEMS support.  Modifications are provided
+ *  as is and may not be correct.
+ *  
+ *  Rob Savoye provided the format for the mc68681 header file
+ *  
+ *  Joel Sherrill provided inspiration for recoding my original assembly
+ *  for this file into C (a good idea)
+ *  
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id: duart.c
+ */
+
+#define MC68681_OFFSET_MULTIPLIER 8
+#include <motorola/mc68681.h>
+#include <bsp.h>
+#include <ringbuf.h>
+          
+rtems_isr console_isr (rtems_vector_number vector);
+
+Ring_buffer_t TX_Buffer[2];
+Ring_buffer_t RX_Buffer[2];
+
+/*  PAGE
+ *
+ *  init_mc88681
+ *
+ *  volatile routine to initialize duart
+ *
+ *  Input parameters: NONE
+ *
+ *  Output parameters: NONE
+ *
+ *  Return Values:     NONE  
+ */
+
+volatile void init_mc88681()
+{
+  /*
+   *  Initialize Ring buffers
+   */
+  Ring_buffer_Initialize( &RX_Buffer[ 0 ] );
+  Ring_buffer_Initialize( &RX_Buffer[ 1 ] );
+
+  Ring_buffer_Initialize( &TX_Buffer[ 0 ] );
+  Ring_buffer_Initialize( &TX_Buffer[ 1 ] );
+}
+
+/*  PAGE
+ *
+ *  console_isr
+ *
+ *  interrupt handler for receive of character from duart on ports A & B 
+ *
+ *  Input parameters: NONE
+ *
+ *  Output parameters: NONE
+ *
+ *  Return Values:     NONE  
+ */
+
+rtems_isr console_isr (rtems_vector_number vector)
+{
+
+   /*
+    *  Fill me in later ...
+    */
+
+}
+
+
+/*  PAGE
+ *
+ *  console_outbyte_polled
+ *
+ *  This routine transmits a character out.
+ *
+ *  Input parameters:
+ *    port - port to transmit character to
+ *    ch  - character to be transmitted
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values: NONE
+ */
+
+void console_outbyte_polled(
+  int port,
+  char ch
+)
+{
+  unsigned char status;
+  unsigned char data;
+  unsigned char t = 0;
+
+  if (port == MC68681_PORT_A) { 
+    status = MC68681_STATUS_REG_A;
+    data = MC68681_TRANSMIT_BUFFER_A;
+  } else {
+    status = MC68681_STATUS_REG_B;
+    data = MC68681_TRANSMIT_BUFFER_B;
+  }
+
+  while ( !(MC68681_READ(DUART_ADDR, status) & MC68681_TX_READY) ){
+    if (t == 0) {
+      Debug_Entry( 0x8000 );
+      t++;
+    }
+  }
+  
+  Debug_Entry( 0x9000 );
+  MC68681_WRITE(DUART_ADDR, data, ch);
+}
+
+
+/*  PAGE
+ *
+ *  console_inbyte_polled
+ *
+ *  This routine reads a character from the UART.
+ *
+ *  Input parameters:
+ *    port - port to read character from
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values:
+ *    character read from UART
+ */
+
+#define MC68681_RECEIVE_ERRORS \
+      (MC68681_OVERRUN_ERROR | MC68681_PARITY_ERROR | MC68681_FRAMING_ERROR)
+
+char console_inbyte_polled( int port )
+{
+  char status;
+  char data;
+  char cmd;
+  unsigned char status_info;
+
+  /*  
+   * Set Port A or B unique variables.         
+   */
+  if (port == MC68681_PORT_A)  {
+    status = MC68681_STATUS_REG_A;
+    data   = MC68681_RECEIVE_BUFFER_A;
+    cmd    = MC68681_COMMAND_REG_A;
+  } else {
+    status = MC68681_STATUS_REG_B;
+    data   = MC68681_RECEIVE_BUFFER_B;
+    cmd    = MC68681_COMMAND_REG_B;
+  }
+
+  /* Wait for the Ready bit and Clear any errors */
+  for ( ; ; ) {
+    status_info = MC68681_READ(DUART_ADDR, status);
+    if ( status_info & MC68681_RX_READY )
+      break;
+
+     if ( status_info & MC68681_RECEIVE_ERRORS )
+         MC68681_WRITE( DUART_ADDR, cmd, MC68681_MODE_REG_RESET_ERROR );
+  }
+
+  return MC68681_READ(DUART_ADDR, data);
+}
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