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/*$$HEADER*/

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/*                    H E A D E R   I N F O R M A T I O N                     */

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// Project Name                   : OpenRISC Debug Proxy

// File Name                      : vpi_functions.c

// Prepared By                    : jb

// Project Start                  : 2008-10-01

/*$$COPYRIGHT NOTICE*/

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/*                                                                            */

/*                      C O P Y R I G H T   N O T I C E                       */

/*                                                                            */

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

/*

  This library is free software; you can redistribute it and/or

  modify it under the terms of the GNU Lesser General Public

  License as published by the Free Software Foundation;

  version 2.1 of the License, a copy of which is available from

  http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt.

  This library is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public

  License along with this library; if not, write to the Free Software

  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

*/

/*$$DESCRIPTION*/

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/*                           D E S C R I P T I O N                            */

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//

// Implements communications with a Verilog RTL simulation via functions running

// in the simulator, attached via VPI.

//

/*$$CHANGE HISTORY*/

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/*                         C H A N G E  H I S T O R Y                         */

/*                                                                            */

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

// Date         Version Description

//------------------------------------------------------------------------

// 081101               First revision                                  jb

#include <assert.h>

#include <stdio.h>

#include <ctype.h>

#include <string.h>

#include <stdlib.h>

#include <unistd.h>

#include <stdarg.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <fcntl.h>

#include <errno.h>

#include <netdb.h> 

#include "gdb.h"

#include "or_debug_proxy.h"

#include "vpi_functions.h"

// Definition of MSG_WAITALL -- appears to be missing from Cygwin's sys/socket.h

#ifdef CYGWIN_COMPILE

#define MSG_WAITALL 0

#endif

// socket stuff for connection to the VPI interface

int vpiPort = VPI_PORT;

int vpi_fd; // should be the descriptor for our connection to the VPI server

#ifdef RTL_SIM

#define DBG_VPI 1

#else

#define DBG_VPI 0

#endif

//Protocol ensuring synchronisation with the jp-rtl_sim program

// 1. jp-rtl_sim will first write a command byte

// 2. jp-rtl_sim will then send the address if it's a read or write

//    or the data to write if it's a dbg_cpu_wr_ctrl (stall & reset bits)

// 3. will then send data if we're writing and we sent address in 2

// 4. wait for response from vpi functions

// commands:

// 4'h1 jtag set instruction register (input: instruction value)

// 4'h2 set debug chain (dbg_set_command here) (input: chain value)

// 4'h3 cpu_ctrl_wr (input: ctrl value (2 bits))

// 4'h4 cpu_ctrl_rd (output: ctrl value (2bits))

// 4'h5 cpu wr reg (inputs: address, data)

// 4'h6 cpu rd reg (input: address; output: data)

// 4'h7 wb wr 32 (inputs: address, data)

// 4'h8 wb rd 32 (input: address; output: data)

// 4'h9 wb wr block 32 (inputs: address, length, data)

// 4'ha wb rd block 32 (inputs: address, length; output: data)

// 4'hb reset

// 4'hc read jtag id (output: data)

#define CMD_JTAG_SET_IR 0x1

#define CMD_SET_DEBUG_CHAIN 0x2

#define CMD_CPU_CTRL_WR 0x3

#define CMD_CPU_CTRL_RD 0x4

#define CMD_CPU_WR_REG 0x5

#define CMD_CPU_RD_REG 0x6

#define CMD_WB_WR32 0x7

#define CMD_WB_RD32 0x8

#define CMD_WB_BLOCK_WR32 0x9

#define CMD_WB_BLOCK_RD32 0xa

#define CMD_RESET 0xb

#define CMD_READ_JTAG_ID 0xc

void send_command_to_vpi(char CMD)

{

  // first thing we do  is send a command

  // and wait for an ack

  uint32_t n;

  char cmd_resp;

  n = write(vpi_fd,&CMD, 1); // send the command to the sim

  if (n < 0)   perror("ERROR writing to VPI socket");

  n = recv(vpi_fd,&cmd_resp,1, MSG_WAITALL); // block and wait for the ack

  if (n < 0)   perror("ERROR Reading from VPI socket");

  if (cmd_resp != CMD) perror("Response from RTL sim incorrect"); //check it acked with cmd

  return;

}

void send_address_to_vpi(uint32_t address)

{

  // Now send address

  uint32_t n;

  char* send_buf;

  address = htonl(address);

  send_buf = (char *) &address;

  n = write(vpi_fd,send_buf, 4); // send the address to the sim

  if (n < 0)   perror("ERROR writing to VPI socket");

  return;

}

void send_data_to_vpi(uint32_t data)

{

  // Now send data

  uint32_t n;

  data = htonl(data);

  char* send_buf;

  send_buf = (char *) &data;

  n = write(vpi_fd,send_buf, 4); // Write the data to the socket

  if (n < 0)   perror("ERROR writing to VPI socket");

  return;

}

void send_block_data_to_vpi(uint32_t len, uint32_t *data)

{

  // Now send data

  uint32_t n, i;

  for (i = 0; i < (len/4); i++)

    data[i] = htonl(data[i]);

  char* send_buf;

  send_buf = (char *) data;

  n = write(vpi_fd,send_buf, len); // Write the data to the socket

  if (n < 0)   perror("ERROR writing to VPI socket");

  return;

}

void get_data_from_vpi(uint32_t* data)

{

  uint32_t n;

  uint32_t inc_data;

  char* recv_buf;

  recv_buf = (char*) &inc_data;

  n = recv(vpi_fd,recv_buf,4, MSG_WAITALL); // block and wait for the data

  if (n < 0)   perror("ERROR Reading from VPI socket");

  inc_data = ntohl(inc_data);

  if (DBG_VPI) printf("get_data_from_vpi: 0x%.8x\n",inc_data);

  *data = inc_data;

  return;

}

void get_block_data_from_vpi(uint32_t len, uint32_t* data)

{

  uint32_t n, i;

  char* recv_buf;

  recv_buf = (char *) data;

  n = recv(vpi_fd, recv_buf, len, MSG_WAITALL); // block and wait for the data

  if (n < 0)   perror("ERROR Reading from VPI socket");

  // re-order host compliant style the recieved words

  if (DBG_VPI) printf("get_block_data_from_vpi: %d bytes",len);

  for (i = 0;i < (len/4); i++)

    {

      data[i] = ntohl(data[i]);

      if (DBG_VPI) printf("0x%.8x ",data[i]);

    }

  if (DBG_VPI) printf("\n");

  return;

}

void get_response_from_vpi()

{

  // Basically just wait for the response from VPI

  // by blocking wait on recv

  uint32_t n;

  char tmp;

  n = recv(vpi_fd,&tmp,1, MSG_WAITALL); // block and wait

  if (n < 0)   perror("ERROR Reading from VPI socket");

  return;

}

/* Resets JTAG

   Writes TRST=0

   and    TRST=1 */

static void jp2_reset_JTAG() {

  debug2("\nreset(");

  send_command_to_vpi(CMD_RESET);

  get_response_from_vpi();

  debug2(")\n");

}

int vpi_connect() {

    int sockfd;

    struct sockaddr_in serv_addr;

    struct hostent *server;

    socklen_t flags;

    char sTemp[256];

    debug2("Started vpi_connect()\n");

    sockfd = socket(AF_INET, SOCK_STREAM, 0);

    //sockfd = socket(PF_INET, SOCK_STREAM, 0);

    if (sockfd < 0) {

      perror("ERROR opening socket");

      goto socket_setup_exit;

    }

    server = gethostbyname("localhost");

    if (server == NULL) {

        fprintf(stderr,"ERROR, no such host\n");

        goto socket_setup_exit;

    }

    /*

    if(fcntl(sockfd, F_GETFL, &flags) < 0) {

      sprintf(sTemp, "Unable to get flags for socket %d", sockfd);

      perror(sTemp);

      close(sockfd);

      goto socket_setup_exit;

    }

    // Set the nonblocking flag

    if(fcntl(sockfd, F_SETFL, flags | O_NONBLOCK) < 0) {

      sprintf(sTemp, "Unable to set flags for socket %d to value 0x%08x",

              sockfd, flags | O_NONBLOCK);

      perror(sTemp);

      close(sockfd);

      goto socket_setup_exit;

    }

    */

    bzero((char *) &serv_addr, sizeof(serv_addr));

    serv_addr.sin_family = AF_INET;

    bcopy(server->h_addr,(char *)&serv_addr.sin_addr.s_addr,server->h_length);

    serv_addr.sin_port = htons(vpiPort);

    printf("Initialising connection with simulation\n");

    if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0)

      {

        perror("Error connecting");

        goto socket_setup_exit;

      }

    return sockfd;

 socket_setup_exit:

    if (vpi_fd) close(vpi_fd);

    exit(1);

}

/* Resets JTAG, and sets DEBUG scan chain */

 int vpi_dbg_reset() {

   uint32_t id;

   jp2_reset_JTAG();

  /* set idcode jtag chain */

  send_command_to_vpi(CMD_JTAG_SET_IR);

  send_data_to_vpi(JI_IDCODE);

  get_response_from_vpi();

  /* now read out the jtag id */

  send_command_to_vpi(CMD_READ_JTAG_ID);

  //id = get_data_from_vpi();  

  get_data_from_vpi((uint32_t *)&id);

  get_response_from_vpi();

  printf("JTAG ID = %08x\n", (unsigned int) id);

  /* now set the chain to debug */

  send_command_to_vpi(CMD_JTAG_SET_IR);

  send_data_to_vpi(JI_DEBUG);

  get_response_from_vpi();

  current_chain = -1;

  return DBG_ERR_OK;

}

void vpi_dbg_test() {

  uint32_t npc, ppc, r1;

  unsigned char stalled;

  printf("  Stall or1k\n");

  dbg_cpu0_write_ctrl(0, 0x01);      // stall or1k

  dbg_cpu0_read_ctrl(0, &stalled);

  if (!(stalled & 0x1)) {

    printf("  or1k stall failed. Exiting\n");   // check stall or1k

    if (vpi_fd) close(vpi_fd);

    exit(1);

  }

  debug2("  Reading npc\n");

  dbg_cpu0_read((0 << 11) + 16, &npc);

  debug2("  Reading ppc\n");

  dbg_cpu0_read((0 << 11) + 18, &ppc);

  debug2("  Reading r1\n");

  dbg_cpu0_read(0x401, &r1);

  printf("  Read      npc = %.8x ppc = %.8x r1 = %.8x\n", npc, ppc, r1);

}

/* Sets scan chain.  */

int vpi_dbg_set_chain(uint32_t chain) {

  //uint32_t status, crc_generated, crc_read;

  if (current_chain == chain)

    return DBG_ERR_OK;

  dbg_chain = chain;

  send_command_to_vpi(CMD_SET_DEBUG_CHAIN);

  send_data_to_vpi(chain);

  get_response_from_vpi();

  current_chain = chain;

  return DBG_ERR_OK;

}

/* writes a ctrl reg */

int vpi_dbg_ctrl(uint32_t reset, uint32_t stall)

{

  debug("\n");

  debug2("ctrl\n");

  vpi_dbg_set_chain(dbg_chain);

  send_command_to_vpi(CMD_CPU_CTRL_WR);

  //send_data_to_vpi(((reset & 0x1) | ((stall&0x1)<<1)));

  send_data_to_vpi(((stall & 0x1) | ((reset&0x1)<<1)));

  get_response_from_vpi();

  return DBG_ERR_OK;

}

/* reads control register */

int vpi_dbg_ctrl_read(uint32_t *reset, uint32_t *stall)

{

  uint32_t resp;

  vpi_dbg_set_chain(dbg_chain);

  debug("\n");

  debug2("ctrl\n");

  vpi_dbg_set_chain(dbg_chain);

  send_command_to_vpi(CMD_CPU_CTRL_RD);

  get_data_from_vpi((uint32_t *)&resp);

  if (DBG_VPI) printf(" dbg_ctrl_read: 0x%.8x\n",resp);

  get_response_from_vpi();

  *reset = (resp & 0x00000001);

  *stall = ((resp >> 1) & 0x00000001);

  return DBG_ERR_OK;

}

/* read a word from wishbone */

int vpi_dbg_wb_read32(uint32_t adr, uint32_t *data)

{

  //uint32_t resp;

  vpi_dbg_set_chain(DC_WISHBONE);

  send_command_to_vpi(CMD_WB_RD32);

  send_address_to_vpi(adr);

  get_data_from_vpi(data);

  get_response_from_vpi();

  return 0;

}

/* write a word to wishbone */

int vpi_dbg_wb_write32(uint32_t adr, uint32_t data)

{

  vpi_dbg_set_chain(DC_WISHBONE);

  send_command_to_vpi(CMD_WB_WR32);

  send_address_to_vpi(adr);

  send_data_to_vpi(data);

  get_response_from_vpi();

  return 0;

}

/* read a block from wishbone */

int vpi_dbg_wb_read_block32(uint32_t adr, uint32_t *data, uint32_t len)

{

  // len is in B Y T E S ! !

  if (DBG_VPI) printf("block read len: %d from addr: 0x%.8x\n",len, adr);

  vpi_dbg_set_chain(DC_WISHBONE);

  send_command_to_vpi(CMD_WB_BLOCK_RD32);

  send_data_to_vpi(adr);

  send_data_to_vpi(len);

  get_block_data_from_vpi(len, data);

  get_response_from_vpi();

  return DBG_ERR_OK;

}

/* write a block to wishbone */

int vpi_dbg_wb_write_block32(uint32_t adr, uint32_t *data, uint32_t len)

{

  vpi_dbg_set_chain(DC_WISHBONE);

  send_command_to_vpi(CMD_WB_BLOCK_WR32);

  send_data_to_vpi(adr);

  send_data_to_vpi(len);

  send_block_data_to_vpi(len, data);

  get_response_from_vpi();

  return DBG_ERR_OK;

}

/* read a register from cpu */

int vpi_dbg_cpu0_read(uint32_t adr, uint32_t *data)

{

  vpi_dbg_set_chain(DC_CPU0);

  send_command_to_vpi(CMD_CPU_RD_REG);

  send_address_to_vpi(adr);

  get_data_from_vpi(data);

  get_response_from_vpi();

  return 0;

}

/* write a cpu register */

int vpi_dbg_cpu0_write(uint32_t adr, uint32_t data)

{

  vpi_dbg_set_chain(DC_CPU0);

  send_command_to_vpi(CMD_CPU_WR_REG);

  send_address_to_vpi(adr);

  send_data_to_vpi(data);

  get_response_from_vpi();

  return 0;

}

/* write a cpu module register */

int vpi_dbg_cpu0_write_ctrl(uint32_t adr, unsigned char data) {

  uint32_t err;

  if ((err = vpi_dbg_set_chain(DC_CPU0))) return err;

  if ((err = vpi_dbg_ctrl(data & 2, data &1))) return err;

  return DBG_ERR_OK;

}

/* read a register from cpu module */

int vpi_dbg_cpu0_read_ctrl(uint32_t adr, unsigned char *data) {

  uint32_t err;

  uint32_t r, s;

  if ((err = vpi_dbg_set_chain(DC_CPU0))) return err;

  if ((err = vpi_dbg_ctrl_read(&r, &s))) return err;

  *data = (r << 1) | s;

  return DBG_ERR_OK;

}