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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"
#include "sched.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);
 
  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;
}
 
/* Simulation hook. Must be called every clock cycle to simulate all UART
   devices. It does internal functional UART simulation. */
void uart_clock16(int i)
{
  int retval;
  /* 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) return;
 
  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 (uarts[i].slowdown)
          uarts[i].slowdown--;
        else if((retval = fgetc(uarts[i].rxfs)) != EOF) {
          uarts[i].iregs.rxser = (char)retval;
          uarts[i].istat.rxser_full = 1;
        } else uarts[i].slowdown = UART_FGETC_SLOWDOWN;
      }
    } else { /* VAPI */
      int received = 0;
      /* do not handle commands while receiving */
      if (uarts[i].istat.rxser_full) return;
      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);
  }
  SCHED_ADD (uart_clock16, i, cycles + UART_CLOCK_DIVIDER);
}
 
/* 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].slowdown = UART_FGETC_SLOWDOWN;
 
    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;
    SCHED_ADD (uart_clock16, i, cycles + UART_CLOCK_DIVIDER);
  }
}
 
/* 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	805	markom	`#include "sched.h"`
40	31	lampret
41	409	markom	`#define MIN(a,b) ((a) < (b) ? (a) : (b))`
42
43	424	markom	`static struct dev_16450 uarts[MAX_UARTS];`
44	221	markom	`static int thre_int;`
45	31	lampret
46			`/* Number of clock cycles (one clock cycle is one call to the uart_clock())`
47			`before a single character is transmitted or received. */`
48	355	markom	`static unsigned long char_clks(int dll, int dlh, int lcr)`
49	31	lampret	`{`
50	409	markom	`float bauds_per_char = 1.;`
51	806	markom	`unsigned long char_clks = ((dlh << 8) + dll);`
52	355	markom
53			`if (lcr & UART_LCR_PARITY)`
54			`bauds_per_char = bauds_per_char + 1.;`
55	31	lampret
56	355	markom	`/* stop bits 1 or two */`
57			`if (lcr & UART_LCR_STOP)`
58			`bauds_per_char = bauds_per_char + 2.;`
59			`else`
60			`if ((lcr & 0x3) != 0)`
61			`bauds_per_char = bauds_per_char + 1.;`
62			`else`
63			`bauds_per_char = bauds_per_char + 1.5;`
64
65			`bauds_per_char = bauds_per_char + (5. + (lcr & 0x3));`
66
67			`return char_clks * bauds_per_char;`
68	31	lampret	`}`
69
70			`/* Set a specific UART register with value. */`
71	238	erez	`void uart_write_byte(unsigned long addr, unsigned long value)`
72	31	lampret	`{`
73	355	markom	`int chipsel;`
74
75			`debug(4, "uart_write_byte(%x,%02x)\n", addr, (unsigned)value);`
76	341	markom
77	424	markom	`for(chipsel = 0; chipsel < MAX_UARTS; chipsel++)`
78	355	markom	`if ((addr & ~(UART_ADDR_SPACE-1)) == config.uarts[chipsel].baseaddr)`
79			`break;`
80	424	markom	`if (chipsel >= MAX_UARTS) return;`
81	31	lampret
82	355	markom	`if (uarts[chipsel].regs.lcr & UART_LCR_DLAB) {`
83			`switch (addr % UART_ADDR_SPACE) {`
84			`case UART_DLL:`
85			`uarts[chipsel].regs.dll = value;`
86			`uarts[chipsel].char_clks = char_clks(uarts[chipsel].regs.dll, uarts[chipsel].regs.dlh, uarts[chipsel].regs.lcr);`
87			`return;`
88			`case UART_DLH:`
89			`uarts[chipsel].regs.dlh = value;`
90			`return;`
91			`}`
92			`}`
93
94			`switch (addr % UART_ADDR_SPACE) {`
95			`case UART_TXBUF:`
96			`if (uarts[chipsel].istat.txbuf_full < uarts[chipsel].fifo_len) {`
97			`uarts[chipsel].istat.txbuf_full++;`
98			`uarts[chipsel].regs.txbuf[uarts[chipsel].istat.txbuf_head] = value;`
99			`uarts[chipsel].istat.txbuf_head = (uarts[chipsel].istat.txbuf_head + 1) % uarts[chipsel].fifo_len;`
100			`} else`
101			`uarts[chipsel].regs.txbuf[uarts[chipsel].istat.txbuf_head] = value;`
102	341	markom
103	411	markom	`uarts[chipsel].regs.lsr &= ~(UART_LSR_TXSERE \| UART_LSR_TXBUFE);`
104	355	markom	`uarts[chipsel].istat.thre_int = 0;`
105			`break;`
106	409	markom	`case UART_FCR:`
107			`uarts[chipsel].regs.fcr = value & UART_VALID_FCR;`
108			`if (uarts[chipsel].fifo_len == 1 && (value & UART_FCR_FIE)`
109			`\|\| uarts[chipsel].fifo_len != 1 && !(value & UART_FCR_FIE))`
110			`value \|= UART_FCR_RRXFI \| UART_FCR_RTXFI;`
111			`uarts[chipsel].fifo_len = (value & UART_FCR_FIE) ? 16 : 1;`
112			`if (value & UART_FCR_RTXFI) {`
113			`uarts[chipsel].istat.txbuf_head = uarts[chipsel].istat.txbuf_tail = 0;`
114			`uarts[chipsel].istat.txbuf_full = 0;`
115	411	markom	`uarts[chipsel].regs.lsr &= ~UART_LSR_TXBUFE;`
116	409	markom	`}`
117			`if (value & UART_FCR_RRXFI) {`
118			`uarts[chipsel].istat.rxbuf_head = uarts[chipsel].istat.rxbuf_tail = 0;`
119			`uarts[chipsel].istat.rxbuf_full = 0;`
120	411	markom	`uarts[chipsel].regs.lsr &= ~UART_LSR_RDRDY;`
121	409	markom	`}`
122			`break;`
123	355	markom	`case UART_IER:`
124			`uarts[chipsel].regs.ier = value & UART_VALID_IER;`
125	423	markom	`#if 0`
126	492	markom	`if (uarts[chipsel].regs.ier & UART_IER_THRI)`
127			`uarts[chipsel].istat.thre_int = 1;`
128	423	markom	`#endif`
129	355	markom	`break;`
130			`case UART_LCR:`
131			`uarts[chipsel].regs.lcr = value & UART_VALID_LCR;`
132	409	markom	`uarts[chipsel].char_clks = char_clks(uarts[chipsel].regs.dll, uarts[chipsel].regs.dlh, uarts[chipsel].regs.lcr);`
133	355	markom	`break;`
134			`case UART_MCR:`
135			`uarts[chipsel].regs.mcr = value & UART_VALID_MCR;`
136			`break;`
137			`case UART_SCR:`
138			`uarts[chipsel].regs.scr = value;`
139			`break;`
140			`default:`
141			`debug(1, "write out of range (addr %x)\n", addr);`
142			`}`
143	31	lampret	`}`
144
145			`/* Read a specific UART register. */`
146	238	erez	`unsigned long uart_read_byte(unsigned long addr)`
147	31	lampret	`{`
148	355	markom	`unsigned char value = 0;`
149			`int chipsel;`
150
151			`debug(4, "uart_read_byte(%x)", addr);`
152
153	424	markom	`for(chipsel = 0; chipsel < MAX_UARTS; chipsel++)`
154	355	markom	`if ((addr & ~(UART_ADDR_SPACE-1)) == config.uarts[chipsel].baseaddr)`
155			`break;`
156	31	lampret
157	424	markom	`if (chipsel >= MAX_UARTS)`
158	355	markom	`return 0;`
159	344	markom
160	355	markom	`if (uarts[chipsel].regs.lcr & UART_LCR_DLAB) {`
161			`switch (addr % UART_ADDR_SPACE) {`
162			`case UART_DLL:`
163			`value = uarts[chipsel].regs.dll;`
164			`debug(4, "= %x\n", value);`
165			`return value;`
166			`case UART_DLH:`
167			`value = uarts[chipsel].regs.dlh;`
168			`debug(4, "= %x\n", value);`
169			`return value;`
170			`}`
171			`}`
172
173			`switch (addr % UART_ADDR_SPACE) {`
174			`case UART_RXBUF:`
175	409	markom	`{ /* Print out FIFO for debugging */`
176			`int i;`
177			`debug(4, "(%i/%i,%i,%i:", uarts[chipsel].istat.rxbuf_full, uarts[chipsel].fifo_len,`
178			`uarts[chipsel].istat.rxbuf_head, uarts[chipsel].istat.rxbuf_tail);`
179			`for (i = 0; i < uarts[chipsel].istat.rxbuf_full; i++)`
180			`debug(4, "%02x ", uarts[chipsel].regs.rxbuf[(uarts[chipsel].istat.rxbuf_tail + i) % uarts[chipsel].fifo_len]);`
181			`debug(4, ")");`
182			`}`
183	355	markom	`if (uarts[chipsel].istat.rxbuf_full) {`
184			`value = uarts[chipsel].regs.rxbuf[uarts[chipsel].istat.rxbuf_tail];`
185			`uarts[chipsel].istat.rxbuf_tail = (uarts[chipsel].istat.rxbuf_tail + 1) % uarts[chipsel].fifo_len;`
186			`uarts[chipsel].istat.rxbuf_full--;`
187			`}`
188
189			`if (uarts[chipsel].istat.rxbuf_full)`
190			`uarts[chipsel].regs.lsr \|= UART_LSR_RDRDY;`
191			`else`
192			`uarts[chipsel].regs.lsr &= ~UART_LSR_RDRDY;`
193	409	markom
194			`uarts[chipsel].istat.timeout_count = 0;`
195	355	markom	`break;`
196			`case UART_IER:`
197			`value = uarts[chipsel].regs.ier & UART_VALID_IER;`
198			`break;`
199			`case UART_IIR:`
200			`value = (uarts[chipsel].regs.iir & UART_VALID_IIR) \| 0xc0;`
201	492	markom	`if (uarts[chipsel].regs.ier & UART_IER_THRI)`
202	490	markom	`uarts[chipsel].istat.thre_int = 0;`
203	355	markom	`break;`
204			`case UART_LCR:`
205			`value = uarts[chipsel].regs.lcr & UART_VALID_LCR;`
206			`break;`
207			`case UART_MCR:`
208			`value = 0;`
209			`break;`
210			`case UART_LSR:`
211			`value = uarts[chipsel].regs.lsr & UART_VALID_LSR;`
212			`uarts[chipsel].regs.lsr &=`
213	409	markom	`~(UART_LSR_OVRRUN \| UART_LSR_BREAK \| UART_LSR_PARITY`
214			`\| UART_LSR_FRAME \| UART_LSR_RXERR);`
215	355	markom	`break;`
216			`case UART_MSR:`
217			`value = uarts[chipsel].regs.msr & UART_VALID_MSR;`
218			`uarts[chipsel].regs.msr = 0;`
219			`break;`
220			`case UART_SCR:`
221			`value = uarts[chipsel].regs.scr;`
222			`break;`
223			`default:`
224			`debug(1, "read out of range (addr %x)\n", addr);`
225			`}`
226			`debug(4, " = %x\n", value);`
227			`return value;`
228	31	lampret	`}`
229
230	336	markom	`/* Function that handles incoming VAPI data. */`
231			`void uart_vapi_read (unsigned long id, unsigned long data)`
232			`{`
233	341	markom	`int uart;`
234	344	markom	`debug(4, "UART: id %08x, data %08x\n", id, data);`
235	341	markom	`uart = id & VAPI_DEVICE_ID;`
236			`uarts[uart].vapi_buf[uarts[uart].vapi_buf_head_ptr] = data;`
237	409	markom	`uarts[uart].vapi_buf_head_ptr = (uarts[uart].vapi_buf_head_ptr + 1) % UART_VAPI_BUF_LEN;`
238	341	markom	`if (uarts[uart].vapi_buf_tail_ptr == uarts[uart].vapi_buf_head_ptr) {`
239			`fprintf (stderr, "FATAL: uart VAPI buffer to small.\n");`
240			`exit (1);`
241			`}`
242			`}`
243	336	markom
244	409	markom	`static void send_char (int uart, int bits_send)`
245			`{`
246			`printf ("'%c'\n", uarts[uart].iregs.txser);`
247			`debug(4, "TX \'%c\' via UART%d...\n", uarts[uart].iregs.txser, uart);`
248			`if (uarts[uart].regs.mcr & UART_MCR_LOOP)`
249			`uarts[uart].iregs.loopback = uarts[uart].iregs.txser;`
250			`else {`
251			`/* Send to either VAPI or to file */`
252			`if (config.uarts[uart].vapi_id) {`
253			`int par, pe, fe, nbits;`
254			`int j, data;`
255			`unsigned long packet = 0;`
256
257			`nbits = MIN (bits_send, (uarts[uart].regs.lcr & UART_LCR_WLEN8) + 5);`
258			`/* Encode a packet */`
259			`packet = uarts[uart].iregs.txser & ((1 << nbits) - 1);`
260
261			`/* Calculate parity */`
262			`for (j = 0, par = 0; j < nbits; j++)`
263			`par ^= (packet >> j) & 1;`
264
265			`if (uarts[uart].regs.lcr & UART_LCR_PARITY) {`
266			`if (uarts[uart].regs.lcr & UART_LCR_SPAR) {`
267			`packet \|= 1 << nbits;`
268			`} else {`
269			`if (uarts[uart].regs.lcr & UART_LCR_EPAR)`
270			`packet \|= par << nbits;`
271			`else`
272			`packet \|= (par ^ 1) << nbits;`
273			`}`
274			`nbits++;`
275			`}`
276			`packet \|= 1 << (nbits++);`
277			`if (uarts[uart].regs.lcr & UART_LCR_STOP)`
278			`packet \|= 1 << (nbits++);`
279
280			`/* Decode a packet */`
281			`nbits = (uarts[uart].vapi.lcr & UART_LCR_WLEN8) + 5;`
282			`data = packet & ((1 << nbits) - 1);`
283
284			`/* Calculate parity, including parity bit */`
285			`for (j = 0, par = 0; j < nbits + 1; j++)`
286			`par ^= (packet >> j) & 1;`
287
288			`if (uarts[uart].vapi.lcr & UART_LCR_PARITY) {`
289			`if (uarts[uart].vapi.lcr & UART_LCR_SPAR) {`
290			`pe = !((packet >> nbits) & 1);`
291			`} else {`
292			`if (uarts[uart].vapi.lcr & UART_LCR_EPAR)`
293			`pe = par != 0;`
294			`else`
295			`pe = par != 1;`
296			`}`
297			`nbits++;`
298			`} else`
299			`pe = 0;`
300
301			`fe = ((packet >> (nbits++)) & 1) ^ 1;`
302			`if (uarts[uart].vapi.lcr & UART_LCR_STOP)`
303			`fe \|= ((packet >> (nbits++)) & 1) ^ 1;`
304
305			`debug (4, "lcr vapi %02x, uart %02x\n", uarts[uart].vapi.lcr, uarts[uart].regs.lcr);`
306			`data \|= (uarts[uart].vapi.lcr << 8) \| (pe << 16) \| (fe << 17) \| (uarts[uart].vapi.lcr << 8);`
307			`printf ("vapi_send (%08x, %08x)\n", config.uarts[uart].vapi_id, data);`
308			`debug (4, "vapi_send (%08x, %08x)\n", config.uarts[uart].vapi_id, data);`
309			`vapi_send (config.uarts[uart].vapi_id, data);`
310			`} else {`
311			`fputc((int)(uarts[uart].iregs.txser & 0xFF), uarts[uart].txfs);`
312			`fflush(uarts[uart].txfs);`
313			`}`
314			`}`
315			`uarts[uart].istat.txser_full = 0;`
316			`uarts[uart].istat.txser_clks = 0;`
317			`}`
318
319	411	markom	`/* Adds a character to the FIFO */`
320
321			`void uart_add_char (int uart, int ch)`
322			`{`
323			`if (uarts[uart].istat.rxbuf_full + 1 > uarts[uart].fifo_len)`
324			`uarts[uart].regs.lsr \|= UART_LSR_OVRRUN \| UART_LSR_RXERR;`
325			`else {`
326			`debug(4, "add %02x\n", ch);`
327			`uarts[uart].regs.rxbuf[uarts[uart].istat.rxbuf_head] = ch;`
328			`uarts[uart].istat.rxbuf_head = (uarts[uart].istat.rxbuf_head + 1) % uarts[uart].fifo_len;`
329			`uarts[uart].istat.rxbuf_full++;`
330			`}`
331			`uarts[uart].regs.lsr \|= UART_LSR_RDRDY;`
332			`uarts[uart].istat.timeout_count = 0;`
333			`}`
334
335	806	markom	`/* Simulation hook. Must be called every clock cycle to simulate all UART`
336			`devices. It does internal functional UART simulation. */`
337			`void uart_clock16(int i)`
338			`{`
339			`int retval;`
340			`/* If VAPI is not selected, UART communicates with two file streams;`
341			`if VAPI is selected, we use VAPI streams. */`
342
343			`/* if txfs is corrupted, skip this uart. */`
344			`if (!config.uarts[i].vapi_id && !uarts[i].txfs) return;`
345
346			`if (uarts[i].vapi.next_break_cnt >= 0)`
347			`if (--uarts[i].vapi.next_break_cnt < 0) {`
348			`if (!(uarts[i].vapi.cur_break = uarts[i].vapi.next_break))`
349			`uarts[i].istat.break_set = 0;`
350			`}`
351
352			`/*************** Transmit ***************/`
353			`if (!uarts[i].istat.txser_full) {`
354			`// uarts[i].regs.lsr \|= UART_LSR_TXBUFE;`
355			`if (uarts[i].istat.txbuf_full) {`
356			`uarts[i].iregs.txser = uarts[i].regs.txbuf[uarts[i].istat.txbuf_tail];`
357			`uarts[i].istat.txbuf_tail = (uarts[i].istat.txbuf_tail + 1) % uarts[i].fifo_len;`
358			`uarts[i].istat.txser_full = 1;`
359			`uarts[i].istat.txbuf_full--;`
360			`uarts[i].regs.lsr &= ~UART_LSR_TXSERE;`
361			`uarts[i].istat.thre_int = 1;`
362			`} else {`
363			`uarts[i].regs.lsr \|= UART_LSR_TXSERE;`
364			`uarts[i].regs.lsr \|= UART_LSR_TXBUFE;`
365			`}`
366			`} else if (uarts[i].char_clks <= uarts[i].istat.txser_clks++) {`
367			`send_char(i, (uarts[i].regs.lcr & UART_LCR_WLEN8) + 5); /* We've sent all bits */`
368			`} else {`
369			`/* We are still sending char here*/`
370
371			`/* Check if we set the break bit */`
372			`if (uarts[i].regs.lcr & UART_LCR_SBC) {`
373			`if (!uarts[i].vapi.break_sent) {`
374			`#if 0`
375			`/* Send broken frame */`
376			`int nbits_sent = ((uarts[i].regs.lcr & UART_LCR_WLEN8) + 5) * (uarts[i].istat.txser_clks - 1) / uarts[i].char_clks;`
377			`send_char(i, nbits_sent);`
378			`#endif`
379			`/* Send one break signal */`
380			`vapi_send (config.uarts[i].vapi_id, UART_LCR_SBC << 8);`
381			`uarts[i].vapi.break_sent = 1;`
382			`}`
383			`/* mark as character was sent */`
384			`uarts[i].istat.txser_full = 0;`
385			`uarts[i].istat.txser_clks = 0;`
386			`} else`
387			`uarts[i].vapi.break_sent = 0;`
388			`}`
389
390			`/*************** Receive ***************/`
391
392			`/* Is there a break? */`
393			`if (uarts[i].vapi.cur_break) {`
394			`uarts[i].vapi.cur_break_cnt++;`
395			`if (uarts[i].vapi.cur_break_cnt > UART_BREAK_COUNT * uarts[i].vapi.char_clks) {`
396			`if (!uarts[i].istat.break_set) {`
397			`unsigned lsr;`
398			`uarts[i].istat.break_set = 1;`
399			`lsr = UART_LSR_BREAK \| UART_LSR_RXERR \| UART_LSR_RDRDY;`
400			`printf ("[%x]\n", uarts[i].regs.lsr);`
401			`uarts[i].istat.rxser_full = 0;`
402			`uarts[i].istat.rxser_clks = 0;`
403			`uart_add_char (i, lsr << 8);`
404			`} else`
405			`uarts[i].vapi.cur_break_cnt = 0;`
406			`}`
407			`if (uarts[i].istat.rxser_full) {`
408			`uarts[i].istat.rxser_full = 0;`
409			`uarts[i].istat.rxser_clks = 0;`
410			`}`
411			`} else {`
412			`if (uarts[i].istat.rxser_full) {`
413			`if (uarts[i].char_clks <= uarts[i].istat.rxser_clks++) {`
414			`/* Set unused character bits to zero and allow lsr register in fifo */`
415			`uarts[i].iregs.rxser &= ((1 << ((uarts[i].regs.lcr & 3) + 5)) - 1) \| 0xff00;`
416			`debug(4, "Receiving 0x%02x'%c' via UART%d...\n", uarts[i].iregs.rxser, uarts[i].iregs.rxser, i);`
417			`uarts[i].istat.rxser_full = 0;`
418			`uarts[i].istat.rxser_clks = 0;`
419			`uart_add_char (i, uarts[i].iregs.rxser);`
420			`}`
421			`}`
422			`}`
423
424			`/* Check if there is something waiting, and put it into rxser */`
425			`if (uarts[i].regs.mcr & UART_MCR_LOOP) {`
426			`uarts[i].iregs.rxser = uarts[i].iregs.loopback;`
427			`uarts[i].istat.rxser_full = 1;`
428			`} else {`
429			`if (!config.uarts[i].vapi_id) {`
430			`if(uarts[i].istat.rxser_full == 0) {`
431			`if (uarts[i].slowdown)`
432			`uarts[i].slowdown--;`
433			`else if((retval = fgetc(uarts[i].rxfs)) != EOF) {`
434			`uarts[i].iregs.rxser = (char)retval;`
435			`uarts[i].istat.rxser_full = 1;`
436			`} else uarts[i].slowdown = UART_FGETC_SLOWDOWN;`
437			`}`
438			`} else { /* VAPI */`
439			`int received = 0;`
440			`/* do not handle commands while receiving */`
441			`if (uarts[i].istat.rxser_full) return;`
442			`while (!received) {`
443			`if (uarts[i].vapi_buf_head_ptr != uarts[i].vapi_buf_tail_ptr) {`
444			`unsigned long data = uarts[i].vapi_buf[uarts[i].vapi_buf_tail_ptr];`
445			`debug(4, "Handling: %08x (%i,%i)\n", data, uarts[i].vapi_buf_head_ptr, uarts[i].vapi_buf_tail_ptr);`
446			`uarts[i].vapi_buf_tail_ptr = (uarts[i].vapi_buf_tail_ptr + 1) % UART_VAPI_BUF_LEN;`
447			`switch (data >> 24) {`
448			`case 0x00:`
449			`uarts[i].vapi.lcr = (data >> 8) & 0xff;`
450			`/* Put data into rx fifo */`
451			`uarts[i].iregs.rxser = data & 0xff;`
452			`uarts[i].vapi.char_clks = char_clks (uarts[i].vapi.dll, uarts[i].vapi.dlh, uarts[i].vapi.lcr);`
453			`if ((uarts[i].vapi.lcr & ~UART_LCR_SBC) != (uarts[i].regs.lcr & ~UART_LCR_SBC)`
454			`\|\| uarts[i].vapi.char_clks != uarts[i].char_clks`
455			`\|\| uarts[i].vapi.skew < -MAX_SKEW \|\| uarts[i].vapi.skew > MAX_SKEW) {`
456			`debug (3, "WARNING: unmatched VAPI (%02x) and uart (%02x) modes.\n",`
457			`uarts[i].vapi.lcr & ~UART_LCR_SBC, uarts[i].regs.lcr & ~UART_LCR_SBC);`
458			`/* Set error bits */`
459			`uarts[i].iregs.rxser \|= (UART_LSR_FRAME \| UART_LSR_RXERR) << 8;`
460			`if (uarts[i].regs.lcr & UART_LCR_PARITY) uarts[i].iregs.rxser \|= UART_LSR_PARITY << 8;`
461			`}`
462			`uarts[i].istat.rxser_full = 1;`
463			`received = 1;`
464			`break;`
465			`case 0x01:`
466			`uarts[i].vapi.dll = (data >> 0) & 0xff;`
467			`uarts[i].vapi.dlh = (data >> 8) & 0xff;`
468			`break;`
469			`case 0x02:`
470			`uarts[i].vapi.lcr = (data >> 8) & 0xff;`
471			`break;`
472			`case 0x03:`
473			`uarts[i].vapi.skew = (signed short)(data & 0xffff);`
474			`break;`
475			`case 0x04:`
476			`uarts[i].vapi.next_break_cnt = data & 0xffff;`
477			`uarts[i].vapi.next_break = (data >> 16) & 1;`
478			`break;`
479			`default:`
480			`debug (0, "WARNING: Invalid vapi command %02x\n", data >> 24);`
481			`break;`
482			`}`
483			`} else break;`
484			`}`
485			`}`
486			`}`
487
488			`/*************** Loopback ***************/`
489			`if (uarts[i].regs.mcr & UART_MCR_LOOP) {`
490			`debug(5, "uart_clock: Loopback\n");`
491			`if ((uarts[i].regs.mcr & UART_MCR_AUX2) !=`
492			`((uarts[i].regs.msr & UART_MSR_DCD) >> 4))`
493			`uarts[i].regs.msr \|= UART_MSR_DDCD;`
494			`if ((uarts[i].regs.mcr & UART_MCR_AUX1) <`
495			`((uarts[i].regs.msr & UART_MSR_RI) >> 4))`
496			`uarts[i].regs.msr \|= UART_MSR_TERI;`
497			`if ((uarts[i].regs.mcr & UART_MCR_RTS) !=`
498			`((uarts[i].regs.msr & UART_MSR_CTS) >> 3))`
499			`uarts[i].regs.msr \|= UART_MSR_DCTS;`
500			`if ((uarts[i].regs.mcr & UART_MCR_DTR) !=`

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