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static char _[] = "@(#)eb29k.c  5.20 93/10/26 09:57:07, Srini, AMD.";

/******************************************************************************

 * Copyright 1991 Advanced Micro Devices, Inc.

 *

 * This software is the property of Advanced Micro Devices, Inc  (AMD)  which

 * specifically  grants the user the right to modify, use and distribute this

 * software provided this notice is not removed or altered.  All other rights

 * are reserved by AMD.

 *

 * AMD MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS

 * SOFTWARE.  IN NO EVENT SHALL AMD BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL

 * DAMAGES IN CONNECTION WITH OR ARISING FROM THE FURNISHING, PERFORMANCE, OR

 * USE OF THIS SOFTWARE.

 *

 * So that all may benefit from your experience, please report  any  problems

 * or  suggestions about this software to the 29K Technical Support Center at

 * 800-29-29-AMD (800-292-9263) in the USA, or 0800-89-1131  in  the  UK,  or

 * 0031-11-1129 in Japan, toll free.  The direct dial number is 512-462-4118.

 *

 * Advanced Micro Devices, Inc.

 * 29K Support Products

 * Mail Stop 573

 * 5900 E. Ben White Blvd.

 * Austin, TX 78741

 * 800-292-9263

 *****************************************************************************

 *      Engineer: Srini Subramanian.

 *****************************************************************************

 * This module implements the communications interface between MONTIP and

 * AMD's EB29K PC plug-in card.

 *****************************************************************************

 */

#include <memory.h>

#include <string.h>

#include "eb29k.h"

#include "types.h"

#include "memspcs.h"

#include "macros.h"

#include "mtip.h"

#include "tdfunc.h"

#include <conio.h>

#include <dos.h>

void    endian_cvt PARAMS((union msg_t *, int));

void    tip_convert32 PARAMS ((BYTE *));

/*

** This function is used to initialize the communication

** channel.  This consists of setting the window location

** of the EB29K to the value defined by the values in

** the file eb29k.h.

*/

INT32

init_comm_eb29k(port_base, mem_seg)

INT32 port_base;

INT32 mem_seg;

   {

   int  result;

   /*** check for existence of the board ***/

   /* Set up memory window location */

   result = outp((unsigned int) port_base,

                 ((int) ((mem_seg >> 10) & 0x1f)));

   /* Set base address to zero */

   outp ((unsigned int) (port_base+1), (unsigned int) 0);

   outp ((unsigned int) (port_base+2), (unsigned int) 0);

   return(0);

   }  /* end init_comm_eb29k() */

/*

** This function is used to send a message to the EB29K.

** If the message is successfully sent, a zero is

** returned.  If the message was not sendable, a -1

** is returned.

**

** Also note that this function does endian conversion on the

** returned message.  This is necessary because the Am29000

** target will be sending big-endian messages and the PC will

** be expecting little-endian.

*/

INT32

msg_send_eb29k(msg_ptr, port_base)

   union  msg_t  *msg_ptr;

   INT32  port_base;

   {

   INT32    result;

   INT32  message_size;

#if 0

   INT32  semaphore;

   /* Set semaphore (EB29K_RECV_BUF_PTR) to zero */

   semaphore = 0;

   result = Mini_write_memory ((INT32)  D_MEM,

                               (ADDR32) EB29K_RECV_BUF_PTR,

                               (INT32)  sizeof(INT32),

                               (BYTE *) &semaphore);

#endif

   /* Get size of whole message */

   message_size = (msg_ptr->generic_msg).length + (2 * sizeof(INT32));

   /* Do endian conversion */

   if (tip_target_config.TipEndian != tip_target_config.P29KEndian)

      endian_cvt(msg_ptr, OUTGOING_MSG);

   /* Send message */

   result = Mini_write_memory ((INT32)  D_MEM,

                               (ADDR32) EB29K_SEND_BUF,

                               (INT32)  message_size,

                               (BYTE *) msg_ptr);

   if (result != 0)

      return(-1);

   /* Interrupt target (write to EB29K mailbox) */

   result = outp((unsigned int) (port_base+3),

                 (int) 0x00);

   return(0);

   }  /* end msg_send_eb29k() */

/*

** This function is used to receive a message to the EB29K.

** If the message is waiting in the buffer, a zero is

** returned and the buffer pointed to by msg_ptr is filled

** in.  If no message was available, a -1 is returned.

**

** Note that this function does endian conversion on the

** returned message.  This is necessary because the Am29000

** target will be sending big-endian messages and the PC will

** be expecting little-endian.

*/

INT32

msg_recv_eb29k(msg_ptr, port_base, Mode)

   union  msg_t  *msg_ptr;

   INT32  port_base;

   INT32  Mode;

   {

   INT32  result;

   ADDR32 recv_buf_addr;

   INT32  parms_length;

   INT32  header_size;

   INT32  semaphore;

   int  retval;

   /* Poll EB29K mailbox */

   /* (If mailbox contains 0xff, a message is waiting) */

   retval = inp((unsigned int) (port_base+3));

   /* If no message waiting, return -1 */

   if (retval != 0xff)

      return (-1);

   /* Get receive buffer address */

   result = Mini_read_memory ((INT32)  D_MEM,

                              (ADDR32) EB29K_RECV_BUF_PTR,

                              (INT32)  sizeof(ADDR32),

                              (BYTE *) &recv_buf_addr);

   if (result != 0) return(-1);

   /* Change endian of recv_buf_addr (if necessary) */

   if (tip_target_config.TipEndian != tip_target_config.P29KEndian)

      tip_convert32((BYTE *) &recv_buf_addr);

   if (recv_buf_addr == 0) return(-1);

   /* Get message header */

   header_size = (INT32) (2 * sizeof(INT32));

   result = Mini_read_memory ((INT32)  D_MEM,

                              (ADDR32) recv_buf_addr,

                              (INT32)  header_size,

                              (BYTE *) msg_ptr);

   if (result != 0) return(-1);

   /* Get rest of message */

   parms_length = (msg_ptr->generic_msg).length;

   if (tip_target_config.TipEndian != tip_target_config.P29KEndian)

      tip_convert32((BYTE *) &parms_length);

   result = Mini_read_memory ((INT32)  D_MEM,

                              (ADDR32) (recv_buf_addr + header_size),

                              (INT32)  parms_length,

                              (BYTE *) &(msg_ptr->generic_msg.byte));

   if (result != 0) return(-1);

   /* Do endian conversion */

   if (tip_target_config.TipEndian != tip_target_config.P29KEndian)

      endian_cvt(msg_ptr, INCOMING_MSG);

   /* Write 0xff to EB29K mailbox */

   /* (This tells EB29K that message has been received) */

   retval = outp((unsigned int) (port_base+3), (int) 0xff);

   /* Set semaphore (EB29K_RECV_BUF_PTR) to zero */

   semaphore = 0;

   result = Mini_write_memory ((INT32)  D_MEM,

                               (ADDR32) EB29K_RECV_BUF_PTR,

                               (INT32)  sizeof(INT32),

                               (BYTE *) &semaphore);

   if (result != 0) return(-1);

   return(msg_ptr->generic_msg.code);

   }  /* end msg_recv_eb29k() */

/*

** This function is used to reset the communication

** channel.  This is used when resyncing the host and

** target and when exiting the monitor.

*/

INT32

exit_comm_eb29k(PC_port_base, PC_mem_seg)

INT32   PC_port_base;

INT32   PC_mem_seg;

   {

     return (0);

   }

INT32

reset_comm_eb29k(PC_port_base, PC_mem_seg)

INT32   PC_port_base;

INT32   PC_mem_seg;

   {

   /* Set up memory window location */

   outp((unsigned int) PC_port_base,

                 ((int) ((PC_mem_seg >> 10) & 0x1f)));

   /* Set base address to zero */

   outp ((unsigned int) (PC_port_base+1), (unsigned int) 0);

   outp ((unsigned int) (PC_port_base+2), (unsigned int) 0);

   return(0);

   }  /* end reset_comm_eb29k() */

INT32

fill_memory_eb29k()

   {

   return(0);

   }

/*

** This function is used to "kick" the EB29K.  This

** amounts to yanking the *RESET line low.  Code

** will begin execution at ROM address 0.

*/

void

go_eb29k(port_base, mem_seg)

INT32 port_base;

INT32 mem_seg;

   {

   int  result;

   /* Toggle the RESET bit in Control Port Register 0 */

   result = outp((unsigned int) port_base,

                 ((int) ((mem_seg >> 10) & 0x1f)));

   result = outp((unsigned int) port_base,

                 ((int) (((mem_seg >> 10) & 0x1f) |

                 EB29K_RESET)));

   }  /* end go_eb29k() */

/*

** This function is used to write a string of bytes to

** the Am29000 memory on the EB29K board.

**

*/

INT32

write_memory_eb29k(memory_space, address, data, byte_count, port_base, mem_seg)

   INT32    memory_space;

   ADDR32   address;

   BYTE    *data;

   INT32    byte_count;

   INT32    port_base;

   INT32    mem_seg;

   {

   INT32  bytes_in_window;

   INT32  copy_count;

   unsigned char        MSbit;

  if (address & 0x80000000)

     MSbit = 0x80;

  else

     MSbit = 0x00;

   while (byte_count > 0) {

      /* Write out low order EB29K_addr bits */

      outp((unsigned int) (port_base+1), (int) ((address >> 14) & 0xff));

      /* Write out high order EB29K_addr bits */

     outp((unsigned int) (port_base+2), (int) (((address >> 22) & 0x7f) | MSbit));

      bytes_in_window = 0x4000 - (address & 0x3fff);

      copy_count = MIN(byte_count, bytes_in_window);

      (void) memmove ((void *) ((mem_seg << 16) + (address & 0x3fff)),

                      (void *) data,

                      (size_t) copy_count);

#if 0

      (void) movedata((unsigned int) FP_SEG(data),

                      (unsigned int) FP_OFF(data),

                      (unsigned int) mem_seg,

                      (unsigned int) (address & 0x3fff),

                      (int) copy_count);

#endif

      data = data + copy_count;

      address = address + copy_count;

      byte_count = byte_count - copy_count;

      }  /* end while loop */

   return(0);

   }  /* End write_memory_eb29k() */

/*

** This function is used to read a string of bytes from

** the Am29000 memory on the EB29K board.   A zero is

** returned if the data is read successfully, otherwise

** a -1 is returned.

**

*/

INT32

read_memory_eb29k(memory_space, address, data, byte_count, port_base, mem_seg)

   INT32    memory_space;

   ADDR32   address;

   BYTE    *data;

   INT32    byte_count;

   INT32    port_base;

   INT32    mem_seg;

   {

   INT32  bytes_in_window;

   INT32  copy_count;

   unsigned char        MSbit;

  if (address & 0x80000000)

     MSbit = 0x80;

  else

     MSbit = 0x00;

   while (byte_count > 0) {

      /* Write out low order EB29K_addr bits */

      outp((unsigned int) (port_base+1), (int) ((address >> 14) & 0xff));

      /* Write out high order EB29K_addr bits */

      outp((unsigned int) (port_base+2), (int) (((address >> 22) & 0x7f) | MSbit));

      bytes_in_window = 0x4000 - (address & 0x3fff);

      copy_count = MIN(byte_count, bytes_in_window);

#if 0

      (void) memmove ((void *) data,

                      (void *) ((mem_seg << 16) + (address & 0x3fff)),

                      (size_t) copy_count);

#endif

      (void) movedata((unsigned int) mem_seg,

                      (unsigned int) (address & 0x3fff),

                      (unsigned int) FP_SEG(data),

                      (unsigned int) FP_OFF(data),

                      (int) copy_count);

      data = data + copy_count;

      address = address + copy_count;

      byte_count = byte_count - copy_count;

      }  /* end while loop */

   return(0);

   }  /* End read_memory_eb29k() */