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/* 16450.c -- Simulation of 8250/16450 serial UART
   Copyright (C) 1999 Damjan Lampret, lampret@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. */
 
/* This is functional simulation of 8250/16450 UARTs. Since we RX/TX data
   via file streams, we can't simulate modem control lines coming from the
   DCE and similar details of communication with the DCE.
 
   This simulated UART device is intended for basic UART device driver
   verification. From device driver perspective this device looks like a
   regular UART but never reports and modem control lines changes (the
   only DCE responses are incoming characters from the file stream).
*/
 
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
 
#include "abstract.h"
#include "16450.h"
#include "sim-config.h"
#include "pic.h"
#include "vapi.h"
 
#define MIN(a,b) ((a) < (b) ? (a) : (b))
 
static struct dev_16450 uarts[MAX_UARTS];
static int thre_int;
 
/* Number of clock cycles (one clock cycle is one call to the uart_clock())
   before a single character is transmitted or received. */
static unsigned long char_clks(int dll, int dlh, int lcr)
{
  float bauds_per_char = 1.;
  unsigned long char_clks = ((dlh << 8) + dll) * UART_CLOCK_DIVIDER;
 
  if (lcr & UART_LCR_PARITY)
    bauds_per_char = bauds_per_char + 1.;
 
  /* stop bits 1 or two */
  if (lcr & UART_LCR_STOP)
    bauds_per_char = bauds_per_char + 2.;
  else
    if ((lcr & 0x3) != 0)
      bauds_per_char = bauds_per_char + 1.;
    else
      bauds_per_char = bauds_per_char + 1.5;
 
  bauds_per_char = bauds_per_char + (5. + (lcr & 0x3));
 
  return char_clks * bauds_per_char;
}
 
/* Set a specific UART register with value. */
void uart_write_byte(unsigned long addr, unsigned long value)
{
  int chipsel;
 
  debug(4, "uart_write_byte(%x,%02x)\n", addr, (unsigned)value);
 
  for(chipsel = 0; chipsel < MAX_UARTS; chipsel++)
    if ((addr & ~(UART_ADDR_SPACE-1)) == config.uarts[chipsel].baseaddr)
      break;
  if (chipsel >= MAX_UARTS) return;
 
  if (uarts[chipsel].regs.lcr & UART_LCR_DLAB) {
    switch (addr % UART_ADDR_SPACE) {
      case UART_DLL:
        uarts[chipsel].regs.dll = value;
        uarts[chipsel].char_clks = char_clks(uarts[chipsel].regs.dll, uarts[chipsel].regs.dlh, uarts[chipsel].regs.lcr);
        return;
      case UART_DLH:
        uarts[chipsel].regs.dlh = value;
        return;
    }
  }
 
  switch (addr % UART_ADDR_SPACE) {
    case UART_TXBUF:
      if (uarts[chipsel].istat.txbuf_full < uarts[chipsel].fifo_len) {
        uarts[chipsel].istat.txbuf_full++;
        uarts[chipsel].regs.txbuf[uarts[chipsel].istat.txbuf_head] = value;
        uarts[chipsel].istat.txbuf_head = (uarts[chipsel].istat.txbuf_head + 1) % uarts[chipsel].fifo_len;
      } else
        uarts[chipsel].regs.txbuf[uarts[chipsel].istat.txbuf_head] = value;
 
      uarts[chipsel].regs.lsr &= ~(UART_LSR_TXSERE | UART_LSR_TXBUFE);
      uarts[chipsel].istat.thre_int = 0;
      break;
    case UART_FCR:
      uarts[chipsel].regs.fcr = value & UART_VALID_FCR;
      if (uarts[chipsel].fifo_len == 1 && (value & UART_FCR_FIE)
       || uarts[chipsel].fifo_len != 1 && !(value & UART_FCR_FIE))
        value |= UART_FCR_RRXFI | UART_FCR_RTXFI;
      uarts[chipsel].fifo_len = (value & UART_FCR_FIE) ? 16 : 1;
      if (value & UART_FCR_RTXFI) {
        uarts[chipsel].istat.txbuf_head = uarts[chipsel].istat.txbuf_tail = 0;
        uarts[chipsel].istat.txbuf_full = 0;
        uarts[chipsel].regs.lsr &= ~UART_LSR_TXBUFE;
      }
      if (value & UART_FCR_RRXFI) {
        uarts[chipsel].istat.rxbuf_head = uarts[chipsel].istat.rxbuf_tail = 0;
        uarts[chipsel].istat.rxbuf_full = 0;
        uarts[chipsel].regs.lsr &= ~UART_LSR_RDRDY;
      }
      break;
    case UART_IER:
      uarts[chipsel].regs.ier = value & UART_VALID_IER;
#if 0
      if (uarts[chipsel].regs.ier & UART_IER_THRI)
        uarts[chipsel].istat.thre_int = 1;
#endif
      break;
    case UART_LCR:
      uarts[chipsel].regs.lcr = value & UART_VALID_LCR;
      uarts[chipsel].char_clks = char_clks(uarts[chipsel].regs.dll, uarts[chipsel].regs.dlh, uarts[chipsel].regs.lcr);
      break;
    case UART_MCR:
      uarts[chipsel].regs.mcr = value & UART_VALID_MCR;
      break;
    case UART_SCR:
      uarts[chipsel].regs.scr = value;
      break;
    default:
      debug(1, "write out of range (addr %x)\n", addr);
  }
}
 
/* Read a specific UART register. */
unsigned long uart_read_byte(unsigned long addr)
{
  unsigned char value = 0;
  int chipsel;
 
  debug(4, "uart_read_byte(%x)", addr);
 
  for(chipsel = 0; chipsel < MAX_UARTS; chipsel++)
    if ((addr & ~(UART_ADDR_SPACE-1)) == config.uarts[chipsel].baseaddr)
      break;
 
  if (chipsel >= MAX_UARTS)
    return 0;
 
  if (uarts[chipsel].regs.lcr & UART_LCR_DLAB) {
    switch (addr % UART_ADDR_SPACE) {
      case UART_DLL:
        value = uarts[chipsel].regs.dll;
        debug(4, "= %x\n", value);
        return value;
      case UART_DLH:
        value = uarts[chipsel].regs.dlh;
        debug(4, "= %x\n", value);
        return value;
    }
  }
 
  switch (addr % UART_ADDR_SPACE) {
    case UART_RXBUF:
      { /* Print out FIFO for debugging */
        int i;
        debug(4, "(%i/%i,%i,%i:", uarts[chipsel].istat.rxbuf_full, uarts[chipsel].fifo_len,
                  uarts[chipsel].istat.rxbuf_head, uarts[chipsel].istat.rxbuf_tail);
        for (i = 0; i < uarts[chipsel].istat.rxbuf_full; i++)
          debug(4, "%02x ", uarts[chipsel].regs.rxbuf[(uarts[chipsel].istat.rxbuf_tail + i) % uarts[chipsel].fifo_len]);
        debug(4, ")");
      }
      if (uarts[chipsel].istat.rxbuf_full) {
        value = uarts[chipsel].regs.rxbuf[uarts[chipsel].istat.rxbuf_tail];
        uarts[chipsel].istat.rxbuf_tail = (uarts[chipsel].istat.rxbuf_tail + 1) % uarts[chipsel].fifo_len;
        uarts[chipsel].istat.rxbuf_full--;
      }
 
      if (uarts[chipsel].istat.rxbuf_full)
        uarts[chipsel].regs.lsr |= UART_LSR_RDRDY;
      else
        uarts[chipsel].regs.lsr &= ~UART_LSR_RDRDY;
 
      uarts[chipsel].istat.timeout_count = 0;
      break;
    case UART_IER:
      value = uarts[chipsel].regs.ier & UART_VALID_IER;
      break;
    case UART_IIR:
      value = (uarts[chipsel].regs.iir & UART_VALID_IIR) | 0xc0;
      if (uarts[chipsel].regs.ier & UART_IER_THRI)
        uarts[chipsel].istat.thre_int = 0;
      break;
    case UART_LCR:
      value = uarts[chipsel].regs.lcr & UART_VALID_LCR;
      break;
    case UART_MCR:
      value = 0;
      break;
    case UART_LSR:
      value = uarts[chipsel].regs.lsr & UART_VALID_LSR;
      uarts[chipsel].regs.lsr &=
        ~(UART_LSR_OVRRUN | UART_LSR_BREAK | UART_LSR_PARITY
         | UART_LSR_FRAME | UART_LSR_RXERR);
      break;
    case UART_MSR:
      value = uarts[chipsel].regs.msr & UART_VALID_MSR;
      uarts[chipsel].regs.msr = 0;
      break;
    case UART_SCR:
      value = uarts[chipsel].regs.scr;
      break;
    default:
      debug(1, "read out of range (addr %x)\n", addr);
  }
  debug(4, " = %x\n", value);
  return value;
}
 
/* Function that handles incoming VAPI data.  */
void uart_vapi_read (unsigned long id, unsigned long data)
{
  int uart;
  debug(4, "UART: id %08x, data %08x\n", id, data);
  uart = id & VAPI_DEVICE_ID;
  uarts[uart].vapi_buf[uarts[uart].vapi_buf_head_ptr] = data;
  uarts[uart].vapi_buf_head_ptr = (uarts[uart].vapi_buf_head_ptr + 1) % UART_VAPI_BUF_LEN;
  if (uarts[uart].vapi_buf_tail_ptr == uarts[uart].vapi_buf_head_ptr) {
    fprintf (stderr, "FATAL: uart VAPI buffer to small.\n");
    exit (1);
  }
}
 
static void send_char (int uart, int bits_send)
{
  printf ("'%c'\n", uarts[uart].iregs.txser);
  debug(4, "TX \'%c\' via UART%d...\n", uarts[uart].iregs.txser, uart);
  if (uarts[uart].regs.mcr & UART_MCR_LOOP)
    uarts[uart].iregs.loopback = uarts[uart].iregs.txser;
  else {
    /* Send to either VAPI or to file */
    if (config.uarts[uart].vapi_id) {
      int par, pe, fe, nbits;
      int j, data;
      unsigned long packet = 0;
 
      nbits = MIN (bits_send, (uarts[uart].regs.lcr & UART_LCR_WLEN8) + 5);
      /* Encode a packet */
      packet = uarts[uart].iregs.txser & ((1 << nbits) - 1);
 
      /* Calculate parity */
      for (j = 0, par = 0; j < nbits; j++)
        par ^= (packet >> j) & 1;
 
      if (uarts[uart].regs.lcr & UART_LCR_PARITY) {
        if (uarts[uart].regs.lcr & UART_LCR_SPAR) {
          packet |= 1 << nbits;
        } else {
          if (uarts[uart].regs.lcr & UART_LCR_EPAR)
            packet |= par << nbits;
          else
            packet |= (par ^ 1) << nbits;
        }
        nbits++;
      }
      packet |= 1 << (nbits++);
      if (uarts[uart].regs.lcr & UART_LCR_STOP)
        packet |= 1 << (nbits++);
 
      /* Decode a packet */
      nbits = (uarts[uart].vapi.lcr & UART_LCR_WLEN8) + 5;
      data = packet & ((1 << nbits) - 1);
 
      /* Calculate parity, including parity bit */
      for (j = 0, par = 0; j < nbits + 1; j++)
        par ^= (packet >> j) & 1;
 
      if (uarts[uart].vapi.lcr & UART_LCR_PARITY) {
        if (uarts[uart].vapi.lcr & UART_LCR_SPAR) {
          pe = !((packet >> nbits) & 1);
        } else {
          if (uarts[uart].vapi.lcr & UART_LCR_EPAR)
            pe = par != 0;
          else
            pe = par != 1;
        }
        nbits++;
      } else
        pe = 0;
 
      fe = ((packet >> (nbits++)) & 1) ^ 1;
      if (uarts[uart].vapi.lcr & UART_LCR_STOP)
        fe |= ((packet >> (nbits++)) & 1) ^ 1;
 
      debug (4, "lcr vapi %02x, uart %02x\n", uarts[uart].vapi.lcr, uarts[uart].regs.lcr);
      data |= (uarts[uart].vapi.lcr << 8) | (pe << 16) | (fe << 17) | (uarts[uart].vapi.lcr << 8);
      printf ("vapi_send (%08x, %08x)\n", config.uarts[uart].vapi_id, data);
      debug (4, "vapi_send (%08x, %08x)\n", config.uarts[uart].vapi_id, data);
      vapi_send (config.uarts[uart].vapi_id, data);
    } else {
      fputc((int)(uarts[uart].iregs.txser & 0xFF), uarts[uart].txfs);
      fflush(uarts[uart].txfs);
    }
  }
  uarts[uart].istat.txser_full = 0;
  uarts[uart].istat.txser_clks = 0;
}
 
/* Adds a character to the FIFO */
 
void uart_add_char (int uart, int ch)
{
  if (uarts[uart].istat.rxbuf_full + 1 > uarts[uart].fifo_len)
    uarts[uart].regs.lsr |= UART_LSR_OVRRUN | UART_LSR_RXERR;
  else {
    debug(4, "add %02x\n", ch);
    uarts[uart].regs.rxbuf[uarts[uart].istat.rxbuf_head] = ch;
    uarts[uart].istat.rxbuf_head = (uarts[uart].istat.rxbuf_head + 1) % uarts[uart].fifo_len;
    uarts[uart].istat.rxbuf_full++;
  }
  uarts[uart].regs.lsr |= UART_LSR_RDRDY;
  uarts[uart].istat.timeout_count = 0;
}
 
/* Reset.  It initializes all registers of all UART devices to zero values,
   (re)opens all RX/TX file streams and places devices in memory address
   space.  */
void uart_reset()
{
  int i;
 
  if (config.sim.verbose && config.nuarts)
    printf("Resetting %u UART(s).\n", config.nuarts);
 
  memset(uarts, 0, sizeof(uarts));
 
  for(i = 0; i < config.nuarts; i++) {
    if (config.uarts[i].vapi_id) {
      if ((config.uarts[i].vapi_id & VAPI_DEVICE_ID) != i) {
        fprintf (stderr, "ERROR: Wrong vapi_id (0x%x) for uart %i, last byte is required to be %02x; ignoring.\n", config.uarts[i].vapi_id, i, i);
        config.uarts[i].vapi_id = 0;
        uarts[i].txfs = 0;
      } else {
        vapi_install_handler (config.uarts[i].vapi_id, uart_vapi_read);
        register_memoryarea(config.uarts[i].baseaddr, UART_ADDR_SPACE, 1, uart_read_byte, uart_write_byte);
      }
    } else if (config.uarts[i].txfile) { /* MM: Try to create stream.  */
      if (!(uarts[i].rxfs = fopen(config.uarts[i].rxfile, "r"))
        && !(uarts[i].rxfs = fopen(config.uarts[i].rxfile, "r+"))) {
        debug (0, "WARNING: UART%d has problems with RX file stream.\n", i);
        continue;
      }
      uarts[i].txfs = fopen(config.uarts[i].txfile, "a");
      if (uarts[i].rxfs && uarts[i].txfs && config.sim.verbose) {
        printf("UART%d at 0x%.8x uses ", i, config.uarts[i].baseaddr);
        printf("%s for RX and %s for TX.\n", config.uarts[i].rxfile, config.uarts[i].txfile);
      } else
        debug (1, "WARNING: UART%d has problems with TX file stream.\n", i);
      register_memoryarea(config.uarts[i].baseaddr, UART_ADDR_SPACE, 1, uart_read_byte, uart_write_byte);
    }
 
    if (config.uarts[i].uart16550)
      uarts[i].fifo_len = 16;
    else
      uarts[i].fifo_len = 1;
 
    uarts[i].istat.rxbuf_head = uarts[i].istat.rxbuf_tail = 0;
    uarts[i].istat.txbuf_head = uarts[i].istat.txbuf_tail = 0;
 
    uarts[i].istat.break_set = 0;
    uarts[i].istat.timeout_count = 0;
    uarts[i].istat.thre_int = 1; /* FIFO is empty at start */
 
    uarts[i].regs.lcr = UART_LCR_RESET;
    uarts[i].vapi.cur_break = uarts[i].vapi.cur_break_cnt = uarts[i].vapi.next_break = 0;
    uarts[i].vapi.next_break_cnt = -1;
  }
}
 
/* Simulation hook. Must be called every clock cycle to simulate all UART
   devices. It does internal functional UART simulation. */
void uart_clock()
{
  int i, retval;
 
  for(i = 0; i < config.nuarts; i++) {
    /* If VAPI is not selected, UART communicates with two file streams;
       if VAPI is selected, we use VAPI streams.  */
 
    /* if txfs is corrupted, skip this uart. */
    if (!config.uarts[i].vapi_id && !uarts[i].txfs) continue;
 
    if (uarts[i].vapi.next_break_cnt >= 0)
      if (--uarts[i].vapi.next_break_cnt < 0) {
        if (!(uarts[i].vapi.cur_break = uarts[i].vapi.next_break))
          uarts[i].istat.break_set = 0;
      }
 
    /***************** Transmit *****************/
    if (!uarts[i].istat.txser_full) {
//      uarts[i].regs.lsr |= UART_LSR_TXBUFE;
      if (uarts[i].istat.txbuf_full) {
        uarts[i].iregs.txser = uarts[i].regs.txbuf[uarts[i].istat.txbuf_tail];
        uarts[i].istat.txbuf_tail = (uarts[i].istat.txbuf_tail + 1) % uarts[i].fifo_len;
        uarts[i].istat.txser_full = 1;
        uarts[i].istat.txbuf_full--;
        uarts[i].regs.lsr &= ~UART_LSR_TXSERE;
        uarts[i].istat.thre_int = 1;
      } else {
        uarts[i].regs.lsr |= UART_LSR_TXSERE;
        uarts[i].regs.lsr |= UART_LSR_TXBUFE;
      }
    } else if (uarts[i].char_clks <= uarts[i].istat.txser_clks++) {
      send_char(i, (uarts[i].regs.lcr & UART_LCR_WLEN8) + 5); /* We've sent all bits */
    } else {
      /* We are still sending char here*/
 
      /* Check if we set the break bit */
      if (uarts[i].regs.lcr & UART_LCR_SBC) {
        if (!uarts[i].vapi.break_sent) {
#if 0
          /* Send broken frame */
          int nbits_sent = ((uarts[i].regs.lcr & UART_LCR_WLEN8) + 5) * (uarts[i].istat.txser_clks - 1) / uarts[i].char_clks;
          send_char(i, nbits_sent);
#endif
          /* Send one break signal */
          vapi_send (config.uarts[i].vapi_id, UART_LCR_SBC << 8);
          uarts[i].vapi.break_sent = 1;
        }
        /* mark as character was sent */
        uarts[i].istat.txser_full = 0;
        uarts[i].istat.txser_clks = 0;
      } else
        uarts[i].vapi.break_sent = 0;
    }
 
    /***************** Receive *****************/
 
    /* Is there a break? */
    if (uarts[i].vapi.cur_break) {
      uarts[i].vapi.cur_break_cnt++;
      if (uarts[i].vapi.cur_break_cnt > UART_BREAK_COUNT * uarts[i].vapi.char_clks) {
        if (!uarts[i].istat.break_set) {
          unsigned lsr;
          uarts[i].istat.break_set = 1;
          lsr = UART_LSR_BREAK | UART_LSR_RXERR | UART_LSR_RDRDY;
          printf ("[%x]\n", uarts[i].regs.lsr);
          uarts[i].istat.rxser_full = 0;
          uarts[i].istat.rxser_clks = 0;
          uart_add_char (i, lsr << 8);
        } else
          uarts[i].vapi.cur_break_cnt = 0;
      }
      if (uarts[i].istat.rxser_full) {
        uarts[i].istat.rxser_full = 0;
        uarts[i].istat.rxser_clks = 0;
      }
    } else {
      if (uarts[i].istat.rxser_full) {
        if (uarts[i].char_clks <= uarts[i].istat.rxser_clks++) {
          /* Set unused character bits to zero and allow lsr register in fifo */
          uarts[i].iregs.rxser &= ((1 << ((uarts[i].regs.lcr & 3) + 5)) - 1) | 0xff00;
          debug(4, "Receiving 0x%02x'%c' via UART%d...\n", uarts[i].iregs.rxser, uarts[i].iregs.rxser, i);
          uarts[i].istat.rxser_full = 0;
          uarts[i].istat.rxser_clks = 0;
          uart_add_char (i, uarts[i].iregs.rxser);
        }
      }
    }
 
    /* Check if there is something waiting, and put it into rxser */
    if (uarts[i].regs.mcr & UART_MCR_LOOP) {
      uarts[i].iregs.rxser = uarts[i].iregs.loopback;
      uarts[i].istat.rxser_full = 1;
    } else {
      if (!config.uarts[i].vapi_id) {
        if(uarts[i].istat.rxser_full == 0) {
          if((retval = fgetc(uarts[i].rxfs)) != EOF) {
            uarts[i].iregs.rxser = (char)retval;
            uarts[i].istat.rxser_full = 1;
          }
        }
      } else { /* VAPI */
        int received = 0;
        /* do not handle commands while receiving */
        if (uarts[i].istat.rxser_full)
          break;
        while (!received) {
          if (uarts[i].vapi_buf_head_ptr != uarts[i].vapi_buf_tail_ptr) {
            unsigned long data = uarts[i].vapi_buf[uarts[i].vapi_buf_tail_ptr];
            debug(4, "Handling: %08x (%i,%i)\n", data, uarts[i].vapi_buf_head_ptr, uarts[i].vapi_buf_tail_ptr);
            uarts[i].vapi_buf_tail_ptr = (uarts[i].vapi_buf_tail_ptr + 1) % UART_VAPI_BUF_LEN;
            switch (data >> 24) {
              case 0x00:
                uarts[i].vapi.lcr = (data >> 8) & 0xff;
                /* Put data into rx fifo */
                uarts[i].iregs.rxser = data & 0xff;
                uarts[i].vapi.char_clks = char_clks (uarts[i].vapi.dll, uarts[i].vapi.dlh, uarts[i].vapi.lcr);
                if ((uarts[i].vapi.lcr & ~UART_LCR_SBC) != (uarts[i].regs.lcr & ~UART_LCR_SBC)
                 || uarts[i].vapi.char_clks != uarts[i].char_clks
                 || uarts[i].vapi.skew < -MAX_SKEW || uarts[i].vapi.skew > MAX_SKEW) {
                  debug (3, "WARNING: unmatched VAPI (%02x) and uart (%02x) modes.\n",
                        uarts[i].vapi.lcr & ~UART_LCR_SBC, uarts[i].regs.lcr & ~UART_LCR_SBC);
                  /* Set error bits */
                  uarts[i].iregs.rxser |= (UART_LSR_FRAME | UART_LSR_RXERR) << 8;
                  if (uarts[i].regs.lcr & UART_LCR_PARITY) uarts[i].iregs.rxser |= UART_LSR_PARITY << 8;
                }
                uarts[i].istat.rxser_full = 1;
                received = 1;
                break;
              case 0x01:
                uarts[i].vapi.dll = (data >> 0) & 0xff;
                uarts[i].vapi.dlh = (data >> 8) & 0xff;
                break;
              case 0x02:
                uarts[i].vapi.lcr = (data >> 8) & 0xff;
                break;
              case 0x03:
                uarts[i].vapi.skew = (signed short)(data & 0xffff);
                break;
              case 0x04:
                uarts[i].vapi.next_break_cnt = data & 0xffff;
                uarts[i].vapi.next_break = (data >> 16) & 1;
                break;
              default:
                debug (0, "WARNING: Invalid vapi command %02x\n", data >> 24);
                break;
            }
          } else break;
        }
      }
    }
 
    /***************** Loopback *****************/
    if (uarts[i].regs.mcr & UART_MCR_LOOP) {
      debug(5, "uart_clock: Loopback\n");
      if ((uarts[i].regs.mcr & UART_MCR_AUX2) !=
          ((uarts[i].regs.msr & UART_MSR_DCD) >> 4))
        uarts[i].regs.msr |= UART_MSR_DDCD;
      if ((uarts[i].regs.mcr & UART_MCR_AUX1) <
          ((uarts[i].regs.msr & UART_MSR_RI) >> 4))
        uarts[i].regs.msr |= UART_MSR_TERI;
      if ((uarts[i].regs.mcr & UART_MCR_RTS) !=
          ((uarts[i].regs.msr & UART_MSR_CTS) >> 3))
        uarts[i].regs.msr |= UART_MSR_DCTS;
      if ((uarts[i].regs.mcr & UART_MCR_DTR) !=
          ((uarts[i].regs.msr & UART_MSR_DSR) >> 5))
        uarts[i].regs.msr |= UART_MSR_DDSR;
      uarts[i].regs.msr &= ~(UART_MSR_DCD | UART_MSR_RI
                | UART_MSR_DSR | UART_MSR_CTS);
      uarts[i].regs.msr |= ((uarts[i].regs.mcr & UART_MCR_AUX2) << 4);
      uarts[i].regs.msr |= ((uarts[i].regs.mcr & UART_MCR_AUX1) << 4);
      uarts[i].regs.msr |= ((uarts[i].regs.mcr & UART_MCR_RTS) << 3);
      uarts[i].regs.msr |= ((uarts[i].regs.mcr & UART_MCR_DTR) << 5);
    }
 
    if (uarts[i].regs.lsr & UART_LSR_RDRDY)
      uarts[i].istat.timeout_count++;
 
    /* Update LSR error bits from the ones from rx FIFO */
    if (uarts[i].istat.rxbuf_full) {
      uarts[i].regs.lsr |= uarts[i].regs.rxbuf[uarts[i].istat.rxbuf_tail] >> 8;
      /* we must delete the lsr status, so that we can clear it from lsr */
      uarts[i].regs.rxbuf[uarts[i].istat.rxbuf_tail] &= 0xff;
    }
 
    /* Interrupt detection in proper priority order. */
    uarts[i].regs.iir = UART_IIR_NO_INT;
    if (uarts[i].regs.ier & UART_IER_RLSI &&                    /* Receiver LS */
        uarts[i].regs.lsr & (UART_LSR_OVRRUN | UART_LSR_PARITY
          | UART_LSR_FRAME | UART_LSR_BREAK)) {
      uarts[i].regs.iir = UART_IIR_RLSI;
    } else if ((uarts[i].regs.ier & UART_IER_RDI)               /* RD available */
        && (uarts[i].istat.rxbuf_full >= UART_FIFO_TRIGGER(uarts[i].regs.fcr >> 6))
        && (uarts[i].regs.lsr & UART_LSR_RDRDY)) {
      uarts[i].regs.iir = UART_IIR_RDI;
    } else if ((uarts[i].regs.ier & UART_IER_RDI)               /* timeout */
        && (uarts[i].istat.timeout_count >= UART_CHAR_TIMEOUT * uarts[i].char_clks)) {
      uarts[i].regs.iir = UART_IIR_CTI;
    } else if (uarts[i].regs.ier & UART_IER_THRI &&             /* Transm. empty */
        uarts[i].regs.lsr & UART_LSR_TXBUFE &&
        uarts[i].istat.thre_int == 1) {
      uarts[i].regs.iir = UART_IIR_THRI;
    } else if (uarts[i].regs.ier & UART_IER_MSI &&              /* Modem status */
        uarts[i].regs.msr & (UART_MSR_DCTS | UART_MSR_DDSR
          | UART_MSR_TERI | UART_MSR_DDCD)) {
      uarts[i].regs.iir = UART_IIR_MSI;
    }
    if (!(uarts[i].regs.iir & UART_IIR_NO_INT)) {
      debug (4, "uarts[i].regs.iir = %i\t", uarts[i].regs.iir);
      report_interrupt(config.uarts[i].irq);
    }
  }
}
 
/* Print register values on stdout. */
void uart_status()
{
  int i, j;
 
  for(i = 0; i < config.nuarts; i++) {
    if ( !config.uarts[i].baseaddr )
      continue;
    printf("\nUART%d visible registers at 0x%.8x:\n", i, config.uarts[i].baseaddr);
    printf("RXBUF:");
    for (j = uarts[i].istat.rxbuf_head; j != uarts[i].istat.rxbuf_tail; j = (j + 1) % uarts[i].fifo_len)
      printf (" %.2x", uarts[i].regs.rxbuf[j]);
    printf("  TXBUF: %.2x\n", uarts[i].regs.txbuf);
    printf("DLL  : %.2x  DLH  : %.2x\n", uarts[i].regs.dll, uarts[i].regs.dlh);
    printf("IER  : %.2x  IIR  : %.2x\n", uarts[i].regs.ier, uarts[i].regs.iir);
    printf("LCR  : %.2x  MCR  : %.2x\n", uarts[i].regs.lcr, uarts[i].regs.mcr);
    printf("LSR  : %.2x  MSR  : %.2x\n", uarts[i].regs.lsr, uarts[i].regs.msr);
    printf("SCR  : %.2x\n", uarts[i].regs.scr);
 
    printf("\nInternal registers (sim debug):\n");
    printf("RXSER: %.2x  TXSER: %.2x\n", uarts[i].iregs.rxser, uarts[i].iregs.txser);
 
    printf("\nInternal status (sim debug):\n");
    printf("char_clks: %d\n", uarts[i].char_clks);
    printf("rxser_clks: %d  txser_clks: %d\n", uarts[i].istat.rxser_clks, uarts[i].istat.txser_clks);
    printf("rxser: %d  txser: %d\n", uarts[i].istat.rxser_full, uarts[i].istat.txser_full);
    printf("rxbuf: %d  txbuf: %d\n", uarts[i].istat.rxbuf_full, uarts[i].istat.txbuf_full);
    printf("Using IRQ%i\n", config.uarts[i].irq);
    if (config.uarts[i].vapi_id)
      printf ("Connected to vapi ID=%x\n\n", config.uarts[i].vapi_id);
    else
      printf("RX fs: %p  TX fs: %p\n\n", uarts[i].rxfs, uarts[i].txfs);
  }
}

Line No.	Rev	Author	Line
1	31	lampret	`/* 16450.c -- Simulation of 8250/16450 serial UART`
2			`Copyright (C) 1999 Damjan Lampret, lampret@opencores.org`
3
4			`This file is part of OpenRISC 1000 Architectural Simulator.`
5
6			`This program is free software; you can redistribute it and/or modify`
7			`it under the terms of the GNU General Public License as published by`
8			`the Free Software Foundation; either version 2 of the License, or`
9			`(at your option) any later version.`
10
11			`This program is distributed in the hope that it will be useful,`
12			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
13			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
14			`GNU General Public License for more details.`
15
16			`You should have received a copy of the GNU General Public License`
17			`along with this program; if not, write to the Free Software`
18			`Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */`
19
20			`/* This is functional simulation of 8250/16450 UARTs. Since we RX/TX data`
21			`via file streams, we can't simulate modem control lines coming from the`
22			`DCE and similar details of communication with the DCE.`
23
24			`This simulated UART device is intended for basic UART device driver`
25			`verification. From device driver perspective this device looks like a`
26			`regular UART but never reports and modem control lines changes (the`
27			`only DCE responses are incoming characters from the file stream).`
28			`*/`
29
30			`#include <stdlib.h>`
31			`#include <stdio.h>`
32			`#include <string.h>`
33
34	235	erez	`#include "abstract.h"`
35	31	lampret	`#include "16450.h"`
36			`#include "sim-config.h"`
37	102	lampret	`#include "pic.h"`
38	336	markom	`#include "vapi.h"`
39	31	lampret
40	409	markom	`#define MIN(a,b) ((a) < (b) ? (a) : (b))`
41
42	424	markom	`static struct dev_16450 uarts[MAX_UARTS];`
43	221	markom	`static int thre_int;`
44	31	lampret
45			`/* Number of clock cycles (one clock cycle is one call to the uart_clock())`
46			`before a single character is transmitted or received. */`
47	355	markom	`static unsigned long char_clks(int dll, int dlh, int lcr)`
48	31	lampret	`{`
49	409	markom	`float bauds_per_char = 1.;`
50			`unsigned long char_clks = ((dlh << 8) + dll) * UART_CLOCK_DIVIDER;`
51	355	markom
52			`if (lcr & UART_LCR_PARITY)`
53			`bauds_per_char = bauds_per_char + 1.;`
54	31	lampret
55	355	markom	`/* stop bits 1 or two */`
56			`if (lcr & UART_LCR_STOP)`
57			`bauds_per_char = bauds_per_char + 2.;`
58			`else`
59			`if ((lcr & 0x3) != 0)`
60			`bauds_per_char = bauds_per_char + 1.;`
61			`else`
62			`bauds_per_char = bauds_per_char + 1.5;`
63
64			`bauds_per_char = bauds_per_char + (5. + (lcr & 0x3));`
65
66			`return char_clks * bauds_per_char;`
67	31	lampret	`}`
68
69			`/* Set a specific UART register with value. */`
70	238	erez	`void uart_write_byte(unsigned long addr, unsigned long value)`
71	31	lampret	`{`
72	355	markom	`int chipsel;`
73
74			`debug(4, "uart_write_byte(%x,%02x)\n", addr, (unsigned)value);`
75	341	markom
76	424	markom	`for(chipsel = 0; chipsel < MAX_UARTS; chipsel++)`
77	355	markom	`if ((addr & ~(UART_ADDR_SPACE-1)) == config.uarts[chipsel].baseaddr)`
78			`break;`
79	424	markom	`if (chipsel >= MAX_UARTS) return;`
80	31	lampret
81	355	markom	`if (uarts[chipsel].regs.lcr & UART_LCR_DLAB) {`
82			`switch (addr % UART_ADDR_SPACE) {`
83			`case UART_DLL:`
84			`uarts[chipsel].regs.dll = value;`
85			`uarts[chipsel].char_clks = char_clks(uarts[chipsel].regs.dll, uarts[chipsel].regs.dlh, uarts[chipsel].regs.lcr);`
86			`return;`
87			`case UART_DLH:`
88			`uarts[chipsel].regs.dlh = value;`
89			`return;`
90			`}`
91			`}`
92
93			`switch (addr % UART_ADDR_SPACE) {`
94			`case UART_TXBUF:`
95			`if (uarts[chipsel].istat.txbuf_full < uarts[chipsel].fifo_len) {`
96			`uarts[chipsel].istat.txbuf_full++;`
97			`uarts[chipsel].regs.txbuf[uarts[chipsel].istat.txbuf_head] = value;`
98			`uarts[chipsel].istat.txbuf_head = (uarts[chipsel].istat.txbuf_head + 1) % uarts[chipsel].fifo_len;`
99			`} else`
100			`uarts[chipsel].regs.txbuf[uarts[chipsel].istat.txbuf_head] = value;`
101	341	markom
102	411	markom	`uarts[chipsel].regs.lsr &= ~(UART_LSR_TXSERE \| UART_LSR_TXBUFE);`
103	355	markom	`uarts[chipsel].istat.thre_int = 0;`
104			`break;`
105	409	markom	`case UART_FCR:`
106			`uarts[chipsel].regs.fcr = value & UART_VALID_FCR;`
107			`if (uarts[chipsel].fifo_len == 1 && (value & UART_FCR_FIE)`
108			`\|\| uarts[chipsel].fifo_len != 1 && !(value & UART_FCR_FIE))`
109			`value \|= UART_FCR_RRXFI \| UART_FCR_RTXFI;`
110			`uarts[chipsel].fifo_len = (value & UART_FCR_FIE) ? 16 : 1;`
111			`if (value & UART_FCR_RTXFI) {`
112			`uarts[chipsel].istat.txbuf_head = uarts[chipsel].istat.txbuf_tail = 0;`
113			`uarts[chipsel].istat.txbuf_full = 0;`
114	411	markom	`uarts[chipsel].regs.lsr &= ~UART_LSR_TXBUFE;`
115	409	markom	`}`
116			`if (value & UART_FCR_RRXFI) {`
117			`uarts[chipsel].istat.rxbuf_head = uarts[chipsel].istat.rxbuf_tail = 0;`
118			`uarts[chipsel].istat.rxbuf_full = 0;`
119	411	markom	`uarts[chipsel].regs.lsr &= ~UART_LSR_RDRDY;`
120	409	markom	`}`
121			`break;`
122	355	markom	`case UART_IER:`
123			`uarts[chipsel].regs.ier = value & UART_VALID_IER;`
124	423	markom	`#if 0`
125	492	markom	`if (uarts[chipsel].regs.ier & UART_IER_THRI)`
126			`uarts[chipsel].istat.thre_int = 1;`
127	423	markom	`#endif`
128	355	markom	`break;`
129			`case UART_LCR:`
130			`uarts[chipsel].regs.lcr = value & UART_VALID_LCR;`
131	409	markom	`uarts[chipsel].char_clks = char_clks(uarts[chipsel].regs.dll, uarts[chipsel].regs.dlh, uarts[chipsel].regs.lcr);`
132	355	markom	`break;`
133			`case UART_MCR:`
134			`uarts[chipsel].regs.mcr = value & UART_VALID_MCR;`
135			`break;`
136			`case UART_SCR:`
137			`uarts[chipsel].regs.scr = value;`
138			`break;`
139			`default:`
140			`debug(1, "write out of range (addr %x)\n", addr);`
141			`}`
142	31	lampret	`}`
143
144			`/* Read a specific UART register. */`
145	238	erez	`unsigned long uart_read_byte(unsigned long addr)`
146	31	lampret	`{`
147	355	markom	`unsigned char value = 0;`
148			`int chipsel;`
149
150			`debug(4, "uart_read_byte(%x)", addr);`
151
152	424	markom	`for(chipsel = 0; chipsel < MAX_UARTS; chipsel++)`
153	355	markom	`if ((addr & ~(UART_ADDR_SPACE-1)) == config.uarts[chipsel].baseaddr)`
154			`break;`
155	31	lampret
156	424	markom	`if (chipsel >= MAX_UARTS)`
157	355	markom	`return 0;`
158	344	markom
159	355	markom	`if (uarts[chipsel].regs.lcr & UART_LCR_DLAB) {`
160			`switch (addr % UART_ADDR_SPACE) {`
161			`case UART_DLL:`
162			`value = uarts[chipsel].regs.dll;`
163			`debug(4, "= %x\n", value);`
164			`return value;`
165			`case UART_DLH:`
166			`value = uarts[chipsel].regs.dlh;`
167			`debug(4, "= %x\n", value);`
168			`return value;`
169			`}`
170			`}`
171
172			`switch (addr % UART_ADDR_SPACE) {`
173			`case UART_RXBUF:`
174	409	markom	`{ /* Print out FIFO for debugging */`
175			`int i;`
176			`debug(4, "(%i/%i,%i,%i:", uarts[chipsel].istat.rxbuf_full, uarts[chipsel].fifo_len,`
177			`uarts[chipsel].istat.rxbuf_head, uarts[chipsel].istat.rxbuf_tail);`
178			`for (i = 0; i < uarts[chipsel].istat.rxbuf_full; i++)`
179			`debug(4, "%02x ", uarts[chipsel].regs.rxbuf[(uarts[chipsel].istat.rxbuf_tail + i) % uarts[chipsel].fifo_len]);`
180			`debug(4, ")");`
181			`}`
182	355	markom	`if (uarts[chipsel].istat.rxbuf_full) {`
183			`value = uarts[chipsel].regs.rxbuf[uarts[chipsel].istat.rxbuf_tail];`
184			`uarts[chipsel].istat.rxbuf_tail = (uarts[chipsel].istat.rxbuf_tail + 1) % uarts[chipsel].fifo_len;`
185			`uarts[chipsel].istat.rxbuf_full--;`
186			`}`
187
188			`if (uarts[chipsel].istat.rxbuf_full)`
189			`uarts[chipsel].regs.lsr \|= UART_LSR_RDRDY;`
190			`else`
191			`uarts[chipsel].regs.lsr &= ~UART_LSR_RDRDY;`
192	409	markom
193			`uarts[chipsel].istat.timeout_count = 0;`
194	355	markom	`break;`
195			`case UART_IER:`
196			`value = uarts[chipsel].regs.ier & UART_VALID_IER;`
197			`break;`
198			`case UART_IIR:`
199			`value = (uarts[chipsel].regs.iir & UART_VALID_IIR) \| 0xc0;`
200	492	markom	`if (uarts[chipsel].regs.ier & UART_IER_THRI)`
201	490	markom	`uarts[chipsel].istat.thre_int = 0;`
202	355	markom	`break;`
203			`case UART_LCR:`
204			`value = uarts[chipsel].regs.lcr & UART_VALID_LCR;`
205			`break;`
206			`case UART_MCR:`
207			`value = 0;`
208			`break;`
209			`case UART_LSR:`
210			`value = uarts[chipsel].regs.lsr & UART_VALID_LSR;`
211			`uarts[chipsel].regs.lsr &=`
212	409	markom	`~(UART_LSR_OVRRUN \| UART_LSR_BREAK \| UART_LSR_PARITY`
213			`\| UART_LSR_FRAME \| UART_LSR_RXERR);`
214	355	markom	`break;`
215			`case UART_MSR:`
216			`value = uarts[chipsel].regs.msr & UART_VALID_MSR;`
217			`uarts[chipsel].regs.msr = 0;`
218			`break;`
219			`case UART_SCR:`
220			`value = uarts[chipsel].regs.scr;`
221			`break;`
222			`default:`
223			`debug(1, "read out of range (addr %x)\n", addr);`
224			`}`
225			`debug(4, " = %x\n", value);`
226			`return value;`
227	31	lampret	`}`
228
229	336	markom	`/* Function that handles incoming VAPI data. */`
230			`void uart_vapi_read (unsigned long id, unsigned long data)`
231			`{`
232	341	markom	`int uart;`
233	344	markom	`debug(4, "UART: id %08x, data %08x\n", id, data);`
234	341	markom	`uart = id & VAPI_DEVICE_ID;`
235			`uarts[uart].vapi_buf[uarts[uart].vapi_buf_head_ptr] = data;`
236	409	markom	`uarts[uart].vapi_buf_head_ptr = (uarts[uart].vapi_buf_head_ptr + 1) % UART_VAPI_BUF_LEN;`
237	341	markom	`if (uarts[uart].vapi_buf_tail_ptr == uarts[uart].vapi_buf_head_ptr) {`
238			`fprintf (stderr, "FATAL: uart VAPI buffer to small.\n");`
239			`exit (1);`
240			`}`
241			`}`
242	336	markom
243	409	markom	`static void send_char (int uart, int bits_send)`
244			`{`
245			`printf ("'%c'\n", uarts[uart].iregs.txser);`
246			`debug(4, "TX \'%c\' via UART%d...\n", uarts[uart].iregs.txser, uart);`
247			`if (uarts[uart].regs.mcr & UART_MCR_LOOP)`
248			`uarts[uart].iregs.loopback = uarts[uart].iregs.txser;`
249			`else {`
250			`/* Send to either VAPI or to file */`
251			`if (config.uarts[uart].vapi_id) {`
252			`int par, pe, fe, nbits;`
253			`int j, data;`
254			`unsigned long packet = 0;`
255
256			`nbits = MIN (bits_send, (uarts[uart].regs.lcr & UART_LCR_WLEN8) + 5);`
257			`/* Encode a packet */`
258			`packet = uarts[uart].iregs.txser & ((1 << nbits) - 1);`
259
260			`/* Calculate parity */`
261			`for (j = 0, par = 0; j < nbits; j++)`
262			`par ^= (packet >> j) & 1;`
263
264			`if (uarts[uart].regs.lcr & UART_LCR_PARITY) {`
265			`if (uarts[uart].regs.lcr & UART_LCR_SPAR) {`
266			`packet \|= 1 << nbits;`
267			`} else {`
268			`if (uarts[uart].regs.lcr & UART_LCR_EPAR)`
269			`packet \|= par << nbits;`
270			`else`
271			`packet \|= (par ^ 1) << nbits;`
272			`}`
273			`nbits++;`
274			`}`
275			`packet \|= 1 << (nbits++);`
276			`if (uarts[uart].regs.lcr & UART_LCR_STOP)`
277			`packet \|= 1 << (nbits++);`
278
279			`/* Decode a packet */`
280			`nbits = (uarts[uart].vapi.lcr & UART_LCR_WLEN8) + 5;`
281			`data = packet & ((1 << nbits) - 1);`
282
283			`/* Calculate parity, including parity bit */`
284			`for (j = 0, par = 0; j < nbits + 1; j++)`
285			`par ^= (packet >> j) & 1;`
286
287			`if (uarts[uart].vapi.lcr & UART_LCR_PARITY) {`
288			`if (uarts[uart].vapi.lcr & UART_LCR_SPAR) {`
289			`pe = !((packet >> nbits) & 1);`
290			`} else {`
291			`if (uarts[uart].vapi.lcr & UART_LCR_EPAR)`
292			`pe = par != 0;`
293			`else`
294			`pe = par != 1;`
295			`}`
296			`nbits++;`
297			`} else`
298			`pe = 0;`
299
300			`fe = ((packet >> (nbits++)) & 1) ^ 1;`
301			`if (uarts[uart].vapi.lcr & UART_LCR_STOP)`
302			`fe \|= ((packet >> (nbits++)) & 1) ^ 1;`
303
304			`debug (4, "lcr vapi %02x, uart %02x\n", uarts[uart].vapi.lcr, uarts[uart].regs.lcr);`
305			`data \|= (uarts[uart].vapi.lcr << 8) \| (pe << 16) \| (fe << 17) \| (uarts[uart].vapi.lcr << 8);`
306			`printf ("vapi_send (%08x, %08x)\n", config.uarts[uart].vapi_id, data);`
307			`debug (4, "vapi_send (%08x, %08x)\n", config.uarts[uart].vapi_id, data);`
308			`vapi_send (config.uarts[uart].vapi_id, data);`
309			`} else {`
310			`fputc((int)(uarts[uart].iregs.txser & 0xFF), uarts[uart].txfs);`
311			`fflush(uarts[uart].txfs);`
312			`}`
313			`}`
314			`uarts[uart].istat.txser_full = 0;`
315			`uarts[uart].istat.txser_clks = 0;`
316			`}`
317
318	411	markom	`/* Adds a character to the FIFO */`
319
320			`void uart_add_char (int uart, int ch)`
321			`{`
322			`if (uarts[uart].istat.rxbuf_full + 1 > uarts[uart].fifo_len)`
323			`uarts[uart].regs.lsr \|= UART_LSR_OVRRUN \| UART_LSR_RXERR;`
324			`else {`
325			`debug(4, "add %02x\n", ch);`
326			`uarts[uart].regs.rxbuf[uarts[uart].istat.rxbuf_head] = ch;`
327			`uarts[uart].istat.rxbuf_head = (uarts[uart].istat.rxbuf_head + 1) % uarts[uart].fifo_len;`
328			`uarts[uart].istat.rxbuf_full++;`
329			`}`
330			`uarts[uart].regs.lsr \|= UART_LSR_RDRDY;`
331			`uarts[uart].istat.timeout_count = 0;`
332			`}`
333
334	341	markom	`/* Reset. It initializes all registers of all UART devices to zero values,`
335	31	lampret	`(re)opens all RX/TX file streams and places devices in memory address`
336	341	markom	`space. */`
337	31	lampret	`void uart_reset()`
338			`{`
339	355	markom	`int i;`
340
341	341	markom	`if (config.sim.verbose && config.nuarts)`
342			`printf("Resetting %u UART(s).\n", config.nuarts);`
343
344	355	markom	`memset(uarts, 0, sizeof(uarts));`
345	261	markom
346	355	markom	`for(i = 0; i < config.nuarts; i++) {`
347	341	markom	`if (config.uarts[i].vapi_id) {`
348			`if ((config.uarts[i].vapi_id & VAPI_DEVICE_ID) != i) {`
349			`fprintf (stderr, "ERROR: Wrong vapi_id (0x%x) for uart %i, last byte is required to be %02x; ignoring.\n", config.uarts[i].vapi_id, i, i);`
350			`config.uarts[i].vapi_id = 0;`
351			`uarts[i].txfs = 0;`
352			`} else {`
353	355	markom	`vapi_install_handler (config.uarts[i].vapi_id, uart_vapi_read);`
354			`register_memoryarea(config.uarts[i].baseaddr, UART_ADDR_SPACE, 1, uart_read_byte, uart_write_byte);`
355			`}`
356			`} else if (config.uarts[i].txfile) { /* MM: Try to create stream. */`
357			`if (!(uarts[i].rxfs = fopen(config.uarts[i].rxfile, "r"))`
358			`&& !(uarts[i].rxfs = fopen(config.uarts[i].rxfile, "r+"))) {`
359	361	markom	`debug (0, "WARNING: UART%d has problems with RX file stream.\n", i);`
360	355	markom	`continue;`
361			`}`
362			`uarts[i].txfs = fopen(config.uarts[i].txfile, "a");`
363			`if (uarts[i].rxfs && uarts[i].txfs && config.sim.verbose) {`
364			`printf("UART%d at 0x%.8x uses ", i, config.uarts[i].baseaddr);`
365			`printf("%s for RX and %s for TX.\n", config.uarts[i].rxfile, config.uarts[i].txfile);`
366			`} else`
367	361	markom	`debug (1, "WARNING: UART%d has problems with TX file stream.\n", i);`
368	355	markom	`register_memoryarea(config.uarts[i].baseaddr, UART_ADDR_SPACE, 1, uart_read_byte, uart_write_byte);`
369	341	markom	`}`
370
371			`if (config.uarts[i].uart16550)`
372			`uarts[i].fifo_len = 16;`
373			`else`
374			`uarts[i].fifo_len = 1;`
375	344	markom
376	341	markom	`uarts[i].istat.rxbuf_head = uarts[i].istat.rxbuf_tail = 0;`
377			`uarts[i].istat.txbuf_head = uarts[i].istat.txbuf_tail = 0;`
378	344	markom
379	409	markom	`uarts[i].istat.break_set = 0;`
380			`uarts[i].istat.timeout_count = 0;`
381	492	markom	`uarts[i].istat.thre_int = 1; /* FIFO is empty at start */`
382
383	344	markom	`uarts[i].regs.lcr = UART_LCR_RESET;`
384	385	markom	`uarts[i].vapi.cur_break = uarts[i].vapi.cur_break_cnt = uarts[i].vapi.next_break = 0;`
385			`uarts[i].vapi.next_break_cnt = -1;`
386	336	markom	`}`
387	31	lampret	`}`
388	261	markom
389	31	lampret	`/* Simulation hook. Must be called every clock cycle to simulate all UART`
390			`devices. It does internal functional UART simulation. */`
391			`void uart_clock()`
392			`{`
393	355	markom	`int i, retval;`
394	341	markom
395	355	markom	`for(i = 0; i < config.nuarts; i++) {`
396	341	markom	`/* If VAPI is not selected, UART communicates with two file streams;`
397			`if VAPI is selected, we use VAPI streams. */`
398	529	simons
399	341	markom	`/* if txfs is corrupted, skip this uart. */`
400	355	markom	`if (!config.uarts[i].vapi_id && !uarts[i].txfs) continue;`
401	385	markom
402			`if (uarts[i].vapi.next_break_cnt >= 0)`
403	409	markom	`if (--uarts[i].vapi.next_break_cnt < 0) {`
404			`if (!(uarts[i].vapi.cur_break = uarts[i].vapi.next_break))`
405			`uarts[i].istat.break_set = 0;`
406			`}`
407	385	markom
408			`/*************** Transmit ***************/`
409	355	markom	`if (!uarts[i].istat.txser_full) {`
410	530	simons	`// uarts[i].regs.lsr \|= UART_LSR_TXBUFE;`
411	355	markom	`if (uarts[i].istat.txbuf_full) {`
412			`uarts[i].iregs.txser = uarts[i].regs.txbuf[uarts[i].istat.txbuf_tail];`
413			`uarts[i].istat.txbuf_tail = (uarts[i].istat.txbuf_tail + 1) % uarts[i].fifo_len;`
414			`uarts[i].istat.txser_full = 1;`
415			`uarts[i].istat.txbuf_full--;`
416			`uarts[i].regs.lsr &= ~UART_LSR_TXSERE;`
417			`uarts[i].istat.thre_int = 1;`
418	530	simons	`} else {`
419	355	markom	`uarts[i].regs.lsr \|= UART_LSR_TXSERE;`
420	530	simons	`uarts[i].regs.lsr \|= UART_LSR_TXBUFE;`
421			`}`
422	409	markom	`} else if (uarts[i].char_clks <= uarts[i].istat.txser_clks++) {`
423			`send_char(i, (uarts[i].regs.lcr & UART_LCR_WLEN8) + 5); /* We've sent all bits */`
424			`} else {`
425			`/* We are still sending char here*/`
426
427			`/* Check if we set the break bit */`
428			`if (uarts[i].regs.lcr & UART_LCR_SBC) {`
429			`if (!uarts[i].vapi.break_sent) {`
430			`#if 0`
431			`/* Send broken frame */`
432			`int nbits_sent = ((uarts[i].regs.lcr & UART_LCR_WLEN8) + 5) * (uarts[i].istat.txser_clks - 1) / uarts[i].char_clks;`
433			`send_char(i, nbits_sent);`
434			`#endif`
435			`/* Send one break signal */`
436			`vapi_send (config.uarts[i].vapi_id, UART_LCR_SBC << 8);`
437			`uarts[i].vapi.break_sent = 1;`
438	355	markom	`}`
439	409	markom	`/* mark as character was sent */`
440			`uarts[i].istat.txser_full = 0;`
441			`uarts[i].istat.txser_clks = 0;`
442			`} else`
443			`uarts[i].vapi.break_sent = 0;`
444	355	markom	`}`
445	341	markom
446	385	markom	`/*************** Receive ***************/`
447
448			`/* Is there a break? */`
449	409	markom	`if (uarts[i].vapi.cur_break) {`
450	385	markom	`uarts[i].vapi.cur_break_cnt++;`
451	409	markom	`if (uarts[i].vapi.cur_break_cnt > UART_BREAK_COUNT * uarts[i].vapi.char_clks) {`
452			`if (!uarts[i].istat.break_set) {`
453	411	markom	`unsigned lsr;`
454	409	markom	`uarts[i].istat.break_set = 1;`
455	423	markom	`lsr = UART_LSR_BREAK \| UART_LSR_RXERR \| UART_LSR_RDRDY;`
456	409	markom	`printf ("[%x]\n", uarts[i].regs.lsr);`
457			`uarts[i].istat.rxser_full = 0;`
458			`uarts[i].istat.rxser_clks = 0;`
459	411	markom	`uart_add_char (i, lsr << 8);`
460	409	markom	`} else`
461			`uarts[i].vapi.cur_break_cnt = 0;`
462			`}`
463			`if (uarts[i].istat.rxser_full) {`
464			`uarts[i].istat.rxser_full = 0;`
465			`uarts[i].istat.rxser_clks = 0;`
466			`}`
467	385	markom	`} else {`
468			`if (uarts[i].istat.rxser_full) {`
469	409	markom	`if (uarts[i].char_clks <= uarts[i].istat.rxser_clks++) {`
470	411	markom	`/* Set unused character bits to zero and allow lsr register in fifo */`
471			`uarts[i].iregs.rxser &= ((1 << ((uarts[i].regs.lcr & 3) + 5)) - 1) \| 0xff00;`
472	409	markom	`debug(4, "Receiving 0x%02x'%c' via UART%d...\n", uarts[i].iregs.rxser, uarts[i].iregs.rxser, i);`
473	385	markom	`uarts[i].istat.rxser_full = 0;`
474			`uarts[i].istat.rxser_clks = 0;`
475	411	markom	`uart_add_char (i, uarts[i].iregs.rxser);`
476	355	markom	`}`
477			`}`
478			`}`
479
480			`/* Check if there is something waiting, and put it into rxser */`
481			`if (uarts[i].regs.mcr & UART_MCR_LOOP) {`
482			`uarts[i].iregs.rxser = uarts[i].iregs.loopback;`
483			`uarts[i].istat.rxser_full = 1;`
484			`} else {`
485			`if (!config.uarts[i].vapi_id) {`
486	529	simons	`if(uarts[i].istat.rxser_full == 0) {`
487			`if((retval = fgetc(uarts[i].rxfs)) != EOF) {`
488			`uarts[i].iregs.rxser = (char)retval;`
489			`uarts[i].istat.rxser_full = 1;`
490			`}`
491			`}`
492	355	markom	`} else { /* VAPI */`
493			`int received = 0;`
494	361	markom	`/* do not handle commands while receiving */`
495			`if (uarts[i].istat.rxser_full)`
496			`break;`
497	355	markom	`while (!received) {`
498			`if (uarts[i].vapi_buf_head_ptr != uarts[i].vapi_buf_tail_ptr) {`
499			`unsigned long data = uarts[i].vapi_buf[uarts[i].vapi_buf_tail_ptr];`
500	409	markom	`debug(4, "Handling: %08x (%i,%i)\n", data, uarts[i].vapi_buf_head_ptr, uarts[i].vapi_buf_tail_ptr);`

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