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/* UART test using ACV */

#include "spr_defs.h"

#include "support.h"

#define UART_ADDR   (0x9c000000)

#define UART_RBR    (UART_ADDR + 0)

#define UART_THR    (UART_ADDR + 0)

#define UART_IER    (UART_ADDR + 1)

#define UART_IIR    (UART_ADDR + 2)

#define UART_FCR    (UART_ADDR + 2)

#define UART_LCR    (UART_ADDR + 3)

#define UART_MCR    (UART_ADDR + 4)

#define UART_LSR    (UART_ADDR + 5)

#define UART_MSR    (UART_ADDR + 6)

#define UART_DLL    (UART_ADDR + 0)

#define UART_DLH    (UART_ADDR + 1)

#define LCR_DIVL    (0x80)

#define LCR_BREAK   (0x40)

#define LCR_STICK   (0x20)

#define LCR_EVENP   (0x10)

#define LCR_PAREN   (0x08)

#define LCR_NSTOP   (0x04)

#define LCR_NBITS   (0x03)

#define LSR_DR      (0x01)

#define LSR_OE      (0x02)

#define LSR_PE      (0x04)

#define LSR_FE      (0x08)

#define LSR_BREAK   (0x10)

#define LSR_TXFE    (0x20)

#define LSR_TXE     (0x40)

#define LSR_ERR     (0x80)

/* fails if x is false */

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

/* Waits a few cycles that uart can prepare its data */

#define WAIT() {asm ("l.nop");asm ("l.nop");asm ("l.nop");asm ("l.nop");}

/* fails if there is an error */

#define NO_ERROR() { unsigned x = getreg (UART_LSR); if ((x & (LSR_BREAK|LSR_FE|LSR_PE|LSR_OE)) && !(x & LSR_ERR)) \

printf ("LSR7 ERR\n"); ASSERT(!(x & LSR_ERR));}

#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);

}

inline void setreg (unsigned long addr, unsigned char value)

{

  *((volatile unsigned char *)addr) = value;

}

inline unsigned long getreg (unsigned long addr)

{

  return *((volatile unsigned char *)addr);

}

void interrupt_handler ()

{

  printf ("Int\n");

}

/* Test reset values and r/w properties of some registers */

void register_test ()

{

  printf ("register test\n");

  { /* test reset values */

    ASSERT(getreg (UART_RBR) == 0x00); //0

    ASSERT(getreg (UART_IER) == 0x00); //1

    ASSERT(getreg (UART_IIR) == 0xc1); //2

    ASSERT(getreg (UART_LCR) == 0x03); //3

    ASSERT(getreg (UART_MCR) == 0x00); //4

    ASSERT(getreg (UART_LSR) == 0x60); //5

    ASSERT(getreg (UART_MSR) == 0x00); //6

    setreg(UART_LCR, LCR_DIVL); //enable latches

    ASSERT(getreg (UART_DLL) == 0x00); //0

    ASSERT(getreg (UART_DLH) == 0x00); //1

    setreg(UART_LCR, 0x00); //disable latches

  }

  { /* test if status registers are read only */

    unsigned long tmp;

    int i;

    tmp = getreg (UART_LSR);

    setreg (UART_LSR, ~tmp);

    ASSERT(getreg (UART_LSR) == tmp);

    for (i = 0; i < 9; i++) {

      setreg (UART_LSR, 1 < i);

      ASSERT(getreg (UART_LSR) == tmp);

    }

    tmp = getreg (UART_MSR);

    setreg (UART_MSR, ~tmp);

    ASSERT(getreg (UART_MSR) == tmp);

    for (i = 0; i < 9; i++) {

      setreg (UART_MSR, 1 < i);

      ASSERT(getreg (UART_MSR) == tmp);

    }

  }

  ASSERT (!(getreg (UART_LSR) & 0x1f));

  { /* test whether MCR is write only, be careful not to set the loopback bit */

    ASSERT(getreg (UART_MCR) == 0x00);

    setreg (UART_MCR, 0x45);

    ASSERT(getreg (UART_MCR) == 0x00);

    setreg (UART_MCR, 0xaa);

    ASSERT(getreg (UART_MCR) == 0x00);

  }

  ASSERT (!(getreg (UART_LSR) & 0x1f));

  { /* Test if Divisor latch byte holds the data */

    int i;

    setreg(UART_LCR, LCR_DIVL); //enable latches

    ASSERT(getreg (UART_LCR) == LCR_DIVL);

    for (i = 0; i < 16; i++) {

      unsigned short tmp = 0xdead << i;

      setreg (UART_DLH, tmp >> 8);

      setreg (UART_DLL, tmp & 0xff);

      ASSERT(getreg (UART_DLL) == (tmp & 0xff)); //0

      ASSERT(getreg (UART_DLH) == (tmp >> 8)); //1

    }

    ASSERT (!(getreg (UART_LSR) & 0x1f));

    for (i = 0; i < 16; i++) {

      unsigned short tmp = 0xdead << i;

      setreg (UART_DLL, tmp >> 8);

      setreg (UART_DLH, tmp & 0xff);

      ASSERT(getreg (UART_DLL) == (tmp >> 8)); //1

      ASSERT(getreg (UART_DLH) == (tmp & 0xff)); //0

    }

    setreg(UART_LCR, 0x00); //disable latches

    ASSERT(getreg (UART_LCR) == 0x00);

    ASSERT (!(getreg (UART_LSR) & 0x1f));

  }

  { /* Test LCR, if it holds our data */

    int i;

    for (i = 0; i < 6; i++) {

      unsigned short tmp = (0xde << i) & 0x3f;

      setreg (UART_LCR, tmp);

      ASSERT(getreg (UART_LCR) == tmp);

    }

    ASSERT (!(getreg (UART_LSR) & 0x1f));

  }

  /* Other registers will be tested later, if they function correctly,

     since we cannot test them now, without destroying anything.  */

}

/* Initializes uart and sends a few bytes to VAPI. It is then activated and send something back. */

void send_recv_test ()

{

  char *s;

  printf ("send_recv_test: ");

  /* Init */

  setreg (UART_IER, 0x00); /* disable interrupts */

  WAIT();

  ASSERT(getreg (UART_IIR) == 0xc1); /* nothing should be happening */

  setreg (UART_FCR, 0x06);      /* clear RX and TX FIFOs */

  setreg (UART_LCR, LCR_DIVL);

  setreg (UART_DLH, 10 >> 8);

  setreg (UART_DLL, 10 & 0xff);

  setreg (UART_LCR, 0x03);    /* 8N1 @ 10 => 160 instructions for one cycle */

  ASSERT(getreg (UART_LCR) == 0x03);

  //printf ("basic\n");

  ASSERT (!(getreg (UART_LSR) & LSR_DR));

  /* Send a string */

  s = "send_";

  while (*s) {

    /* Wait for tx fifo to be empty */

    while (!(getreg (UART_LSR) & LSR_TXFE));

    NO_ERROR();

    setreg (UART_THR, *s); /* send character */

    NO_ERROR();

    s++;

  }

  ASSERT (!(getreg (UART_LSR) & LSR_DR));

  s = "test_";

  while (*s) {

    /* Wait for tx fifo and tx to be empty */

    while (!(getreg (UART_LSR) & LSR_TXE));

    NO_ERROR();

    setreg (UART_THR, *s); /* send character */

    NO_ERROR();

    s++;

  }

  ASSERT (!(getreg (UART_LSR) & LSR_DR));

  /* Send characters with delay inbetween */

  s = "is_running";

  while (*s) {

    int i;

    /* Wait for tx fifo and tx to be empty */

    while (!(getreg (UART_LSR) & LSR_TXE));

    NO_ERROR();

    setreg (UART_THR, *s); /* send character */

    NO_ERROR();

    for (i = 0; i < 1600; i++) /* wait at least ten chars before sending next one */

      asm volatile ("l.nop");

    s++;

  }

  while (!(getreg (UART_LSR) & LSR_TXE));

  NO_ERROR();

  setreg (UART_THR, 0); /* send terminate character */

  NO_ERROR();

  /* Receives and compares the string */

  s = "recv_test";

  while (*s) {

    /* Wait for rx fifo to be  */

    while (!(getreg (UART_LSR) & LSR_DR));

    NO_ERROR();

    ASSERT (getreg (UART_RBR) == *s); /* compare character */

    NO_ERROR();

    s++;

  }

  printf ("OK\n");

}

/* sends break in both directions */

void break_test ()

{

  char *s;

  printf ("break_test: ");

  /* Send and receive break */

  NO_ERROR();

  setreg (UART_LCR, LCR_BREAK);

  while (!(getreg (UART_LSR) & LSR_BREAK));

  setreg (UART_THR, '*');

  while (getreg (UART_LSR) & LSR_BREAK);

  NO_ERROR(); /* BREAK bit should be cleared */

  /* Break while sending characters */

  s = "no_star";

  while (*s) {

    /* Wait for tx fifo to be empty */

    while (!(getreg (UART_LSR) & LSR_TXFE));

    NO_ERROR();

    setreg (UART_THR, *s); /* send character */

    NO_ERROR();

    s++;

  }

  ASSERT (!(getreg (UART_LSR) & LSR_DR));

  /* this should break the * char, so it should not be received */

  setreg (UART_LCR, LCR_BREAK);

  setreg (UART_THR, '*');

  /* uart should hold line long enough even if we drop it immediately */

  setreg (UART_LCR, 0);

  NO_ERROR();

  /* Receives and compares the string */

  s = "no_star";

  while (*s) {

    /* Wait for rx fifo to be nonempty */

    while (!(getreg (UART_LSR) & LSR_DR));

    NO_ERROR();

    ASSERT (getreg (UART_RBR) == *s); /* compare character */

    s++;

  }

  /* right now we should receive break */

  while (!(getreg (UART_LSR) & LSR_BREAK));

  setreg (UART_THR, '*');

  while (getreg (UART_LSR) & LSR_BREAK);

  NO_ERROR(); /* BREAK bit should be cleared */

  /* we should not receive incoming characters */

  ASSERT (!(getreg (UART_LSR) & LSR_DR));

  printf ("OK\n");

}

void loopback_test ()

{

  printf ("loopback test\n");

  setreg (UART_MCR, 0);

}

int main ()

{

  /* Use our low priority interrupt handler */

  excpt_lpint = (unsigned long)interrupt_handler;

  /* Enable interrupts */

  mtspr (SPR_SR, mfspr(SPR_SR) | SPR_SR_EXR);

  register_test ();

  send_recv_test ();

  break_test ();

  /*different_modes_test ();

  loopback_send_rcv_test ();

  interrupt_test ();

  fifo_test ();

  loopback_test ();

  modem_test ();

  line_error_test ();

  speed_error_test ();

  frame_error_test ();

  modem_error_test ();*/

  printf ("ALL TESTS PASSED\n");

  return 0;

}