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#include "common.h"
#include "support.h"
#include "net.h"
#include "uart.h"
#include "spr_defs.h"
#include "flash.h"
 
#define SOH    0x01
#define STX    0x02
#define EOT    0x04
#define ACK    0x06
#define NAK    0x15
#define CAN    0x18
#define C      0x43
 
#define CPMEOF 0x1A
 
#define RETRY   10
#define TIMEOUT 3
 
/* update CRC */
unsigned short
updcrc(register int c, register unsigned int crc)
{
  register int count;
 
  for (count=8; --count>=0;) {
    if (crc & 0x8000) {
      crc <<= 1;
      crc += (((c<<=1) & 0400)  !=  0);
      crc ^= 0x1021;
    }
    else {
      crc <<= 1;
      crc += (((c<<=1) & 0400)  !=  0);
    }
  }
  return crc;
}
 
 
static thand_f *mTimeHandler;
static unsigned long mTimeValue;
static int mTimeoutCount;
 
static unsigned long src_addr;
 
unsigned int length;
unsigned int modemMode = 0, bLen = 128;
unsigned short mycrc;
unsigned long bno = 0;
 
static void mStartTimeout(void);
 
void
mSetTimeout(int iv, thand_f *f)
{
  if(iv == 0)
    mTimeHandler = (thand_f *)0;
  else {
    mTimeHandler = f;
    mTimeValue = get_timer(0) + iv;
  }
}
 
static void
mStartTimeout(void)
{
  if(++mTimeoutCount >= RETRY) {
    printf("...retry counter exceeded, quitting...\n");
    return;
  } else {
    printf(".");
    mSetTimeout(TIMEOUT * TICKS_PER_SEC, mStartTimeout);
    uart_putc(C);
 
  }
}
 
static void
mReceiveTimeout(void)
{
  if(++mTimeoutCount >= RETRY) {
    uart_putc(NAK);
    printf("...");
    return;
  } else {
    mSetTimeout(TIMEOUT * TICKS_PER_SEC, mReceiveTimeout);
    uart_putc(NAK);
  }
}
 
int
getBlock(unsigned char t)
{
  unsigned int i = 0, j = 0;
  unsigned char mybuf[133];
  unsigned char bNo, nBno;
  unsigned long dst_addr;
 
  unsigned char flags;
  flags = UART_LSR_FE | UART_LSR_PE | UART_LSR_OE | UART_LSR_BI; /*frame,parity,overrun errors */
 
  mycrc = 0;
 
  switch(t) {
  case SOH:
    for(i = 0; i < 132; i++) {
      if((REG8(UART_BASE + UART_LSR) & flags) == flags) {
	uart_putc(CAN);
      }
      mybuf[i] = uart_getc();
    }
 
    bNo = mybuf[0]; /* packet id */
    nBno = mybuf[1]; /* neg. packet id */
 
    if((bNo == 0x00) && (nBno == 0xff) && (bno == 0)) { /* start block */
      modemMode = 2; /* ymodem */
      uart_putc(ACK); 
      uart_putc(C);
      return 1;
    }
    else if((0xff-bNo) == nBno) { /* data block */
      for(i = 2, j = 0; i < 130; i++, j++) {
	length++;
	mycrc = updcrc(mybuf[i], mycrc);
       	dst_addr = src_addr+(bno*0x8000)+((bNo-1)*0x80)+j;
	REG8(dst_addr) = mybuf[i];
      }
 
      mycrc = updcrc(mybuf[130], mycrc);
      mycrc = updcrc(mybuf[131], mycrc);
 
      if(mycrc == 0) /* CRC match! */ {
	uart_putc(ACK);
	for(i=0;i < 128; i+=4) {
	/*	for(j=0; j<4; j++) {
	  tmp = tmp << 8;
	  tmp |= mybuf[i+j+2];
	}
	dst_addr = src_addr+(bno*0x8000)+((bNo-1)*128)+i;
	fl_word_program(dst_addr, tmp);*/
	}
	if(bNo == 0xff)
	  bno++;
	return 1;
      }
      else {
	uart_putc(NAK);
	return -1;
      }
    }
    else { /* packet id didn't match neg packet id! */
      uart_putc(NAK);
      return -1;
    }
    return 1;
    break;
  case EOT:
    if(modemMode == 2) {/* ymodem */
      uart_putc(NAK);
      if(uart_getc() == EOT) {
	uart_putc(ACK);
	uart_putc(C);
      }
      else
	uart_putc(ACK);
    } else /* zmodem */
      uart_putc(ACK);
 
    return 0;
    break;
  default:
    /* Unknown header */
    uart_putc(NAK);
    return -1;
  }
}
 
int
mGetData(unsigned long saddr)
{
  int retval = 1;
  unsigned char c;
 
  length = 0;
  src_addr = saddr;
  modemMode = 1;
  bno = 0;
 
  printf("src_addr: 0x%lx\n", src_addr);
  if(fl_init() != 0) {
    printf("Flash init failed!\n");
    return(-1);
  }
 
#if 0
  printf("Unlocking flash...");
  for (i = 0, c = FLASH_BASE_ADDR; i < (FLASH_SIZE / FLASH_BLOCK_SIZE); 
       i++, c += FLASH_BLOCK_SIZE)
    if (fl_unlock_one_block (c)) return 1;
  printf("done\n");
 
  printf("Erasing flash...");
  for (i = 0, c = FLASH_BASE_ADDR; i < (FLASH_SIZE / FLASH_BLOCK_SIZE); 
       i++, c += FLASH_BLOCK_SIZE)
    if (fl_block_erase (c)) return 1;
    printf ("done\n");
#endif
  printf("Waiting...");
 
  mTimeoutCount = 0;
  mSetTimeout(TIMEOUT * TICKS_PER_SEC, mStartTimeout);
 
  while(1) {
    if(mTimeHandler && (get_timer(0) > mTimeValue)) {
      thand_f *x;
      x = mTimeHandler;
      mTimeHandler = (thand_f *)0;
      (*x)();
    }
    c = uart_testc();
    if(c != 0)
      break;
  }
 
  while(retval != 0) {
    retval = getBlock(c);
    if(retval != 0)
      c = uart_getc();
  }
 
  if(modemMode == 2) {
    c = uart_getc();
    retval = getBlock(c); /* last 'dummy' block for YModem */
    printf("... protocol: YModem, ");
  }
  else
    printf("... protocol: ZModem, ");
  return length;
}