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/*
 *	Copyright 1994, 1995, 2000 Neil Russell.
 *	(See License)
 *	Copyright 2000, 2001 DENX Software Engineering, Wolfgang Denk, wd@denx.de
 */
 
#include "common.h"
#include "support.h"
#include "net.h"
#include "tftp.h"
#include "bootp.h"
 
#define WELL_KNOWN_PORT	69	/* Well known TFTP port #               */
#define TIMEOUT		2	/* Seconds to timeout for a lost pkt    */
#define TIMEOUT_COUNT	10	/* # of timeouts before giving up       */
					/* (for checking the image size)        */
#define HASHES_PER_LINE	65	/* Number of "loading" hashes per line  */
 
/*
 *	TFTP operations.
 */
#define TFTP_RRQ	1
#define TFTP_WRQ	2
#define TFTP_DATA	3
#define TFTP_ACK	4
#define TFTP_ERROR	5
 
static int TftpServerPort;	/* The UDP port at their end            */
static int TftpOurPort;		/* The UDP port at our end              */
static int TftpTimeoutCount;
static unsigned TftpBlock;
static unsigned TftpLastBlock;
static int TftpState;
#define STATE_RRQ	1
#define STATE_DATA	2
#define STATE_TOO_LARGE	3
#define STATE_BAD_MAGIC	4
 
char *tftp_filename;
 
// running TFTP CRC value
unsigned long TFTP_CHKSUM;
 
#ifdef CFG_DIRECT_FLASH_TFTP
extern flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
#endif
 
static __inline__ void
store_block(unsigned block, unsigned char *src, unsigned len)
{
	unsigned long offset = block * 512, newsize = offset + len;
#ifdef CFG_DIRECT_FLASH_TFTP
	int i, rc = 0;
 
	for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
		/* start address in flash? */
		if (global.src_addr + offset >= flash_info[i].start[0]) {
			rc = 1;
			break;
		}
	}
 
	if (rc) {		/* Flash is destination for this packet */
		rc = flash_write((unsigned char *)src,
				 (unsigned long)(global.src_addr + offset),
				 len);
		switch (rc) {
		case 0:	/* OK */
			break;
		case 1:
			printf("Timeout writing to Flash\n");
			break;
		case 2:
			printf("Flash not Erased\n");
			break;
		case 4:
			printf("Can't write to protected Flash sectors\n");
			break;
		case 8:
			printf("Outside available Flash\n");
			break;
		case 16:
			printf("Size must be aligned (multiple of 8?)\n");
			break;
		default:
			printf("%s[%d] FIXME: rc=%d\n", __FILE__, __LINE__, rc);
			break;
		}
		if (rc) {
			NetState = NETLOOP_FAIL;
			return;
		}
	} else
#endif /* CFG_DIRECT_FLASH_TFTP */
 
//#define QUICK_ETHPACKET_COPY    
#ifdef QUICK_ETHPACKET_COPY
	{
		unsigned char *dst =
		    (unsigned char *)(global.src_addr + offset);
		//printf("quick ethpacket copy: src: 0x%x dst: 0x%x, len: %d\n",(unsigned long)src, (unsigned long)dst, len);
		// First, align the destination address so we can copy words
		// If either src or dst are not word aligned, then we will never
		// be able to do word copies
		while ((len)
		       && ((((unsigned long)dst) & 0x3)
			   || (((unsigned long)src) & 0x3))) {
			//              printf("bc: src: 0x%x dst: 0x%x, len: %d\n",(unsigned long)src, (unsigned long)dst, len);
			dst[0] = src[0];
			len--;
			dst++;
			src++;
 
		}
		unsigned long *wdst, *wsrc;
		wdst = (unsigned long *)dst;
		wsrc = (unsigned long *)src;
		while (len >= 4) {
			//printf("wc: src: 0x%x dst: 0x%x, len: %d\n",(unsigned long)src, (unsigned long)dst, len);
			wdst[0] = wsrc[0];
			wdst++;
			wsrc++;
			len -= 4;
			dst += 4;
			src += 4;
 
		}
		while (len) {
			//printf("cu: src: 0x%x dst: 0x%x, len: %d\n",(unsigned long)src, (unsigned long)dst, len);
			dst[0] = src[0];
			len--;
			dst++;
			src++;
		}
	}
#else
 
#ifdef TFTP_CALC_CRC
		// Call special memcpy that calculates CRC for us:
		TFTP_CHKSUM +=
		    memcpy_crc((void *)(global.src_addr + offset), src, len);
#else
		// Standard memcpy:
		(void)memcpy((void *)(global.src_addr + offset), src, len);
#endif
 
#endif
 
	if (NetBootFileXferSize < newsize)
		NetBootFileXferSize = newsize;
}
 
static void TftpSend(void);
static void TftpTimeout(void);
 
/**********************************************************************/
 
static void TftpSend(void)
{
	volatile unsigned char *pkt;
	volatile unsigned char *xp;
	int len = 0;
 
#ifdef ET_DEBUG
	printf("TftpSend: %d\n", TftpState);
#endif
 
	/*
	 *      We will always be sending some sort of packet, so
	 *      cobble together the packet headers now.
	 */
	pkt = NetTxPacket + ETHER_HDR_SIZE + IP_HDR_SIZE;
 
	switch (TftpState) {
 
	case STATE_RRQ:
		xp = pkt;
		(*((unsigned short *)pkt)) = SWAP16c(TFTP_RRQ);
		pkt += sizeof(short);
		strcpy((char *)pkt, tftp_filename);
		pkt += strlen(tftp_filename) + 1;
		strcpy((char *)pkt, "octet");
		pkt += 5 /*strlen("octet") */  + 1;
		len = pkt - xp;
 
		break;
 
	case STATE_DATA:
		xp = pkt;
		*((unsigned short *)pkt) = SWAP16c(TFTP_ACK);
		pkt += sizeof(short);
		*((unsigned short *)pkt) = SWAP16(TftpBlock);
		pkt += sizeof(short);
		len = pkt - xp;
		break;
 
	case STATE_TOO_LARGE:
		xp = pkt;
		*((unsigned short *)pkt) = SWAP16c(TFTP_ERROR);
		pkt += sizeof(short);
		*((unsigned short *)pkt) = SWAP16(3);
		pkt += sizeof(short);
		strcpy((char *)pkt, "File too large");
		pkt += 14 /*strlen("File too large") */  + 1;
		len = pkt - xp;
		break;
 
	case STATE_BAD_MAGIC:
		xp = pkt;
		*((unsigned short *)pkt) = SWAP16c(TFTP_ERROR);
		pkt += sizeof(short);
		*((unsigned short *)pkt) = SWAP16(2);
		pkt += sizeof(short);
		strcpy((char *)pkt, "File has bad magic");
		pkt += 18 /*strlen("File has bad magic") */  + 1;
		len = pkt - xp;
		break;
	}
 
	NetSetEther(NetTxPacket, NetServerEther, PROT_IP);
	NetSetIP(NetTxPacket + ETHER_HDR_SIZE, NetServerIP,
		 TftpServerPort, TftpOurPort, len);
	NetSendPacket(NetTxPacket, ETHER_HDR_SIZE + IP_HDR_SIZE + len);
 
}
 
static void
TftpHandler(unsigned char *pkt, unsigned dest, unsigned src, unsigned len)
{
#ifdef ET_DEBUG
	//  printf("TftpHandler\n");
#endif
	if (dest != TftpOurPort) {
		return;
	}
	if (TftpState != STATE_RRQ && src != TftpServerPort) {
		return;
	}
 
	if (len < 2) {
		return;
	}
	len -= 2;
	switch (SWAP16(*((unsigned short *)pkt))) {
 
	case TFTP_RRQ:
	case TFTP_WRQ:
	case TFTP_ACK:
		pkt += sizeof(short);
		break;
	default:
		break;
 
	case TFTP_DATA:
		pkt += sizeof(short);
		if (len < 2)
			return;
		len -= 2;
		TftpBlock = SWAP16(*(unsigned short *)pkt);
		if (((TftpBlock - 1) % 10) == 0) {
			putc('#');
			TftpTimeoutCount = 0;
		} else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0) {
			printf("\n\t ");
		}
 
		if (TftpState == STATE_RRQ) {
			TftpState = STATE_DATA;
			TftpServerPort = src;
			TftpLastBlock = 0;
 
			if (TftpBlock != 1) {	/* Assertion */
				printf("\nTFTP error: "
				       "First block is not block 1 (%d)\n"
				       "Starting again\n\n", TftpBlock);
				NetStartAgain();
				break;
			}
		}
 
		if (TftpBlock == TftpLastBlock) {
#ifdef ET_DEBUG
			printf("block %d - repeated\n", TftpLastBlock);
#endif
			/*
			 *    Same block again; resend ack (maybe got lost last time)
			 */
			TftpSend();
			break;
		} else {
#ifdef ET_DEBUG
			printf("block %d - OK\n", TftpLastBlock);
#endif
			TftpLastBlock = TftpBlock;
			NetSetTimeout(TIMEOUT * TICKS_PER_SEC, TftpTimeout);
 
			store_block(TftpBlock - 1, pkt + 2, len);
		}
 
		/*
		 *      Acknoledge the block just received, which will prompt
		 *      the server for the next one.
		 */
		TftpSend();
 
		if (len < 512) {
			/*
			 *      We received the whole thing.  Try to
			 *      run it.
			 */
			printf("\ndone\n");
			NetState = NETLOOP_SUCCESS;
		}
		break;
 
	case TFTP_ERROR:
		pkt += sizeof(short);
		printf("\nTFTP error: '%s' (%d)\n",
		       pkt + 2, SWAP16(*(unsigned short *)pkt));
		printf("Starting again\n\n");
		NetStartAgain();
		break;
	}
 
}
 
static void TftpTimeout(void)
{
	if (++TftpTimeoutCount >= TIMEOUT_COUNT) {
		printf("\nRetry count exceeded; starting again\n");
		NetStartAgain();
	} else {
		printf("T ");
		NetSetTimeout(TIMEOUT * TICKS_PER_SEC, TftpTimeout);
		TftpSend();
	}
}
 
void TftpStart(void)
{
#ifdef ET_DEBUG
	printf("\nServer ethernet address %02x:%02x:%02x:%02x:%02x:%02x\n",
	       NetServerEther[0],
	       NetServerEther[1],
	       NetServerEther[2],
	       NetServerEther[3], NetServerEther[4], NetServerEther[5]
	    );
#endif /* DEBUG */
 
	TFTP_CHKSUM = 0;	// Reset checksum
 
	printf("TFTP from server ");
	print_IPaddr(NetServerIP);
	printf("; our IP address is ");
	print_IPaddr(NetOurIP);
 
	// Check if we need to send across this subnet
	if (NetOurGatewayIP && NetOurSubnetMask) {
		IPaddr_t OurNet = NetOurIP & NetOurSubnetMask;
		IPaddr_t ServerNet = NetServerIP & NetOurSubnetMask;
 
		if (OurNet != ServerNet) {
			printf("; sending through gateway ");
			print_IPaddr(NetOurGatewayIP);
		}
	}
	putc('\n');
 
	printf("Filename '%s'.", tftp_filename);
 
	if (NetBootFileSize) {
		printf(" Size is %d%s kB => %x Bytes",
		       NetBootFileSize / 2,
		       (NetBootFileSize % 2) ? ".5" : "", NetBootFileSize << 9);
	}
 
	putc('\n');
 
	printf("Load address: 0x%lx\n", global.src_addr);
 
	printf("Loading: *\b");
 
	NetSetTimeout(TIMEOUT * TICKS_PER_SEC, TftpTimeout);
	NetSetHandler(TftpHandler);
 
	TftpServerPort = WELL_KNOWN_PORT;
	TftpTimeoutCount = 0;
	TftpState = STATE_RRQ;
	TftpOurPort = 1024 + (get_timer(0) % 3072);
 
	TftpSend();
}