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/* uart.c -- test for uart, by using VAPI

   Copyright (C) 2001, Marko Mlinar, markom@opencores.org

This file is part of OpenRISC 1000 Architectural Simulator.

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

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program 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 General Public License for more details.

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

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

Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

/* UART messages */

#define TX_CMD      0xff000000

#define TX_CMD0     0x00000000

#define TX_CHAR     0x000000ff

#define TX_NBITS    0x00000300

#define TX_STOPLEN  0x00000400

#define TX_PARITY   0x00000800

#define TX_EVENP    0x00001000

#define TX_STICK    0x00002000

#define TX_BREAK    0x00004000

/* Send speed */

#define TX_CMD1     0x01000000

#define TX_SPEED    0x0000ffff

/* Send receive LCR reg */

#define TX_CMD2     0x02000000

/* Send skew */

#define TX_CMD3     0x03000000

/* Set break */

#define TX_CMD4     0x04000000

#define TX_CMD4_BREAK 0x00010000

#define TX_CMD4_DELAY 0x0000ffff

/* Check FIFO */

#define TX_CMD5     0x05000000

#define TX_CMD5_FIFOFULL 0x0000001

#define RX_CMD0     0x00000000

#define RX_PARERR   0x00010000

#define RX_FRAERR   0x00020000

/* fails if x is false */

#define ASSERT(x) ((x)?1:fail (__FUNCTION__, __LINE__))

#define MARK() printf ("Passed line %i\n", __LINE__)

#define VAPI_READ(x) {unsigned long r = vapi_read (); printf ("expected 0x%08x, read 0x%08x\n", r, (x)); ASSERT(r == (x));}

#ifndef __LINE__

#define __LINE__  0

#endif

void fail (char *func, int line)

{

#ifndef __FUNCTION__

#define __FUNCTION__ "?"

#endif

  printf ("Test failed in %s:%i\n", func, line);

  exit (1);

}

char str[5000];

/* current comm. control bits */

int control, control_rx;

void recv_char (char c)

{

  unsigned long tmp = vapi_read ();

  printf ("expected %08x, read %08x\n", control_rx | c, tmp);

  /* test if something is wrong */

  ASSERT ((tmp & 0xffffff00) == control_rx);

  tmp &= 0xff;

  if (tmp) printf ("'%c'\n", (char)tmp);

  else printf ("\\0\n");

  printf ("expected %02x, read %02x\n", c, tmp);

  ASSERT (c == (char)tmp);

}

void send_char (char c)

{

  vapi_write (c | (control & 0xffffff00));

}

char *read_string (char *s)

{

  char *t = s;

  unsigned long tmp = 1;

  while (tmp) {

    tmp = vapi_read ();

    printf ("%08x, %08x\n", tmp, control_rx);

    /* test if something is wrong */

    ASSERT ((tmp & 0xffffff00) == control_rx);

    tmp &= 0xff;

    if (tmp) printf ("'%c'\n", (char)tmp);

    else printf ("\\0\n");

    *(t++) = (char)tmp;

  }

  return s;

}

void compare_string (char *s) {

  while (*s) {

    unsigned long tmp = vapi_read ();

    /* test if something is wrong */

    ASSERT (tmp == (control_rx | *s));

    tmp &= 0xff;

    if (tmp) printf ("'%c'\n", (char)tmp);

    else printf ("\\0\n");

    s++;

  }

}

void send_string (char *s)

{

  while (*s)

    vapi_write (*(s++) | (control & 0xffffff00));

}

void init_8n1 ()

{

  vapi_write(TX_CMD1 | 2); /* Set tx/rx speed */

  control = control_rx = TX_CMD0 | TX_NBITS;

  vapi_write(TX_CMD2 | control_rx); /* Set rx mode */

}

void test_registers ()

{

  /* This test is performed just by cpu, if it is not stopped, we have an error.  */

  printf ("Testing registers... ");

  MARK();

}

void send_recv_test ()

{

  printf ("send_recv_test\n");

  MARK();

  read_string (str);

  MARK();

  printf ("OK\nread: %s\n",str);

  ASSERT (strcmp (str, "send_test_is_running") == 0);

  send_string ("recv");

  MARK();

  printf ("OK\n");

}

void break_test ()

{

  printf ("break_test\n");

  /* receive a break */

  VAPI_READ (TX_BREAK);

  MARK();

  vapi_write (control | '*');

  MARK();

  VAPI_READ (control | '!');

  MARK();

  /* send a break */

  vapi_write (TX_CMD4 | TX_CMD4_BREAK | (0) & TX_CMD4_DELAY);

  vapi_write (control | 'b');

  MARK();

  VAPI_READ (control | '#');

  MARK();

  vapi_write (TX_CMD4 | (0) & TX_CMD4_DELAY);

  vapi_write (control | '$');

  MARK();

  /* Receive a breaked string "ns<brk>*", only "ns" should be received.  */

  compare_string ("ns");

  VAPI_READ (TX_BREAK);

  send_string ("?");

  MARK();

  /* Send a break */

  VAPI_READ (control | '#');

  vapi_write(TX_CMD4 | TX_CMD4_BREAK | (5 & TX_CMD4_DELAY));

  vapi_write (control | 0);

  /* Wait four chars */

  send_string ("234");

  MARK();

  /* FIFO should be empty */

  vapi_write(TX_CMD5);

  send_string ("5");

  /* FIFO should be nonempty and */

  vapi_write(TX_CMD5 | TX_CMD5_FIFOFULL);

  MARK();

  /* it should contain '?' */

  VAPI_READ ('?' | control);

  /* Reset break signal*/

  vapi_write(TX_CMD4 | (0) & TX_CMD4_DELAY);

  MARK();

  vapi_write ('!' | control);

  printf ("OK\n");

}

/* Tries to send data in different modes in both directions */

/* Utility function, that tests current configuration */

void test_mode (int nbits)

{

  unsigned mask = (1 << nbits) - 1;

  recv_char ('U' & mask); //0x55

#if DETAILED

  recv_char ('U' & mask); //0x55

  send_char ('U');        //0x55  

#endif

  send_char ('U');        //0x55

  recv_char ('a' & mask); //0x61

#if DETAILED

  recv_char ('a' & mask); //0x61

  send_char ('a');        //0x61

#endif

  send_char ('a');        //0x61

}

void different_modes_test ()

{

  int speed, length, parity;

  printf ("different modes test\n");

  /* Init */

  /* Test different speeds */

  for (speed = 1; speed < 5; speed++) {

    vapi_write(TX_CMD1 | speed); /* Set tx/rx speed */

    control_rx = control = 0x03 << 8;    /* 8N1 */

    vapi_write(TX_CMD2 | control_rx); /* Set rx mode */

    test_mode (8);

    MARK();

  }

  MARK();

  vapi_write(TX_CMD1 | 1); /* Set tx/rx speed */

  MARK();

  /* Test all parity modes with different char lengths */

  for (parity = 0; parity < 8; parity++)

    for (length = 0; length < 4; length++) {

      control_rx = control = (length | (0 << 2) | (parity << 3)) << 8;

      vapi_write(TX_CMD2 | control_rx);

      test_mode (5 + length);

      MARK();

    }

  MARK();

  /* Test configuration, if we have >1 stop bits */

  for (length = 0; length < 4; length++) {

    control_rx = control = (length | (1 << 2) | (0 << 3)) << 8;

    vapi_write(TX_CMD2 | control_rx);

    test_mode (5 + length);

    MARK();

  }

  MARK();

  /* Restore normal mode */

  recv_char ('T'); /* Wait for acknowledge */

  vapi_write(TX_CMD1 | 2); /* Set tx/rx speed */

  control_rx = control = 0x03 << 8;    /* 8N1 @ 2*/

  vapi_write(TX_CMD2 | control_rx); /* Set rx mode */

  recv_char ('T'); /* Wait for acknowledge before ending the test */

  MARK();

  printf ("OK\n");

}

/* Test various FIFO levels, break and framing error interrupt, etc */

void interrupt_test ()

{

  int i;

  vapi_write(TX_CMD1 | 6); /* Set tx/rx speed */

  printf ("interrupt_test\n");

  /* start interrupt test */

  recv_char ('I'); /* Test trigger level 1 */

  send_char ('0');

  recv_char ('I'); /* Test trigger level 4 */

  send_char ('1');

  send_char ('2');

  send_char ('3');

  send_char ('4');

  recv_char ('I'); /* Test trigger level 8 */

  send_char ('5');

  send_char ('6');

  send_char ('7');

  send_char ('8');

  send_char ('9');

  recv_char ('I'); /* Test trigger level 14 */

  send_char ('a');

  send_char ('b');

  send_char ('c');

  send_char ('d');

  send_char ('e');

  send_char ('f');

  send_char ('g');

  recv_char ('I'); /* Test OE */

  send_char ('h');

  send_char ('i');

  send_char ('j');

  send_char ('*'); /* should not be put in the fifo */

  recv_char ('I'); /* test break interrupt */

  /* send a break */

  vapi_write (TX_CMD4 | TX_CMD4_BREAK | (0) & TX_CMD4_DELAY);

  vapi_write (control | 'b');

  MARK();

  recv_char ('B'); /* Release break */

  MARK();

  vapi_write (TX_CMD4 | (0) & TX_CMD4_DELAY);

  vapi_write (control | '$');

  MARK();

  /* TODO: Check for parity error */

  /* TODO: Check for frame error */

  /* Check for timeout */

  recv_char ('I');

  send_char ('T'); /* Send char -> timeout should occur */

  recv_char ('T'); /* Wait for acknowledge before changing configuration */

  MARK ();

  /* Restore previous mode */

  vapi_write(TX_CMD1 | 2); /* Set tx/rx speed */

  control = control_rx = TX_CMD0 | TX_NBITS;

  vapi_write(TX_CMD2 | control_rx); /* Set rx mode */

  recv_char ('T'); /* Wait for acknowledge before ending the test */

  printf ("OK\n");

}

/* Test if all control bits are set correctly.  Lot of this was already tested

   elsewhere and tests are not duplicated.  */

void control_register_test ()

{

  printf ("control_register_test\n");

  recv_char ('*');

  send_char ('*');

  MARK ();

  recv_char ('!');

  send_char ('!');

  MARK ();

  recv_char ('1');

  recv_char ('*');

  send_char ('*');

  printf ("OK\n");

}

void line_error_test ()

{

  vapi_write(TX_CMD2 | control_rx); /* Set rx mode */

  recv_char ('c');

  vapi_write(TX_CMD1 | 3); /* Set incorrect tx/rx speed */

  send_char ('a');

  vapi_write(TX_CMD1 | 2); /* Set correct tx/rx speed */

  send_char ('b');

  MARK ();

#if COMPLETE

  recv_char ('*');

  control = TX_CMD0 | TX_NBITS;

  control_rx = TX_CMD0 | TX_NBITS | TX_STOPLEN;

  vapi_write(TX_CMD2 | control_rx); /* Set rx mode */

  recv_char ('*');

  MARK ();

#endif

}

int vapi_main ()

{

  /* Test section area */

  test_registers ();

  init_8n1 ();

/*  send_recv_test ();

  break_test();

  different_modes_test ();

  interrupt_test ();

  control_register_test ();*/

  line_error_test ();

  /* End of test section area */

  send_char ('@');

  return 0;

}