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/*******************************************************************************
*
* Filename: emac.c
*
* Instantiation of routines for MAC/ethernet functions supporting tftp.
*
* Revision information:
*
* 28AUG2004 kb_admin initial creation
* 08JAN2005 kb_admin added tftp download
* also adapted from external sources
*
* BEGIN_KBDD_BLOCK
* No warranty, expressed or implied, is included with this software. It is
* provided "AS IS" and no warranty of any kind including statutory or aspects
* relating to merchantability or fitness for any purpose is provided. All
* intellectual property rights of others is maintained with the respective
* owners. This software is not copyrighted and is intended for reference
* only.
* END_BLOCK
*
* $FreeBSD: release/9.1.0/sys/boot/arm/at91/libat91/emac.c 172991 2007-10-25 22:50:25Z cognet $
******************************************************************************/
#include "at91rm9200.h"
#include "at91rm9200_lowlevel.h"
#include "emac.h"
#include "lib.h"
/* ****************************** GLOBALS *************************************/
/* ********************** PRIVATE FUNCTIONS/DATA ******************************/
static receive_descriptor_t *p_rxBD;
static unsigned short localPort;
static unsigned short serverPort;
static unsigned serverMACSet;
static unsigned localIPSet, serverIPSet;
static unsigned lastSize;
static unsigned char serverMACAddr[6];
static unsigned char localIPAddr[4], serverIPAddr[4];
static int ackBlock;
static char *dlAddress;
static unsigned transmitBuffer[1024 / sizeof(unsigned)];
static unsigned tftpSendPacket[256 / sizeof(unsigned)];
/*
* .KB_C_FN_DEFINITION_START
* unsigned short IP_checksum(unsigned short *p, int len)
* This private function calculates the IP checksum for various headers.
* .KB_C_FN_DEFINITION_END
*/
static unsigned short
IP_checksum(unsigned short *p, int len)
{
unsigned i, t;
len &= ~1;
for (i=0,t=0; i<len; i+=2, ++p)
t += SWAP16(*p);
t = (t & 0xffff) + (t >> 16);
return (~t);
}
/*
* .KB_C_FN_DEFINITION_START
* void GetServerAddress(void)
* This private function sends an ARP request to determine the server MAC.
* .KB_C_FN_DEFINITION_END
*/
static void
GetServerAddress(void)
{
arp_header_t *p_ARP;
p_ARP = (arp_header_t*)transmitBuffer;
p_memset((char*)p_ARP->dest_mac, 0xFF, 6);
memcpy(p_ARP->src_mac, localMACAddr, 6);
p_ARP->frame_type = SWAP16(PROTOCOL_ARP);
p_ARP->hard_type = SWAP16(1);
p_ARP->prot_type = SWAP16(PROTOCOL_IP);
p_ARP->hard_size = 6;
p_ARP->prot_size = 4;
p_ARP->operation = SWAP16(ARP_REQUEST);
memcpy(p_ARP->sender_mac, localMACAddr, 6);
memcpy(p_ARP->sender_ip, localIPAddr, 4);
p_memset((char*)p_ARP->target_mac, 0, 6);
memcpy(p_ARP->target_ip, serverIPAddr, 4);
// wait until transmit is available
while (!(*AT91C_EMAC_TSR & AT91C_EMAC_BNQ)) ;
*AT91C_EMAC_TSR |= AT91C_EMAC_COMP;
*AT91C_EMAC_TAR = (unsigned)transmitBuffer;
*AT91C_EMAC_TCR = 0x40;
}
/*
* .KB_C_FN_DEFINITION_START
* void Send_TFTP_Packet(char *tftpData, unsigned tftpLength)
* This private function initializes and send a TFTP packet.
* .KB_C_FN_DEFINITION_END
*/
static void
Send_TFTP_Packet(char *tftpData, unsigned tftpLength)
{
transmit_header_t *macHdr = (transmit_header_t*)tftpSendPacket;
ip_header_t *ipHdr;
udp_header_t *udpHdr;
unsigned t_checksum;
memcpy(macHdr->dest_mac, serverMACAddr, 6);
memcpy(macHdr->src_mac, localMACAddr, 6);
macHdr->proto_mac = SWAP16(PROTOCOL_IP);
ipHdr = (ip_header_t*)&macHdr->packet_length;
ipHdr->ip_v_hl = 0x45;
ipHdr->ip_tos = 0;
ipHdr->ip_len = SWAP16(28 + tftpLength);
ipHdr->ip_id = 0;
ipHdr->ip_off = SWAP16(0x4000);
ipHdr->ip_ttl = 64;
ipHdr->ip_p = PROTOCOL_UDP;
ipHdr->ip_sum = 0;
memcpy(ipHdr->ip_src, localIPAddr, 4);
memcpy(ipHdr->ip_dst, serverIPAddr, 4);
ipHdr->ip_sum = SWAP16(IP_checksum((unsigned short*)ipHdr, 20));
udpHdr = (udp_header_t*)(ipHdr + 1);
udpHdr->src_port = localPort;
udpHdr->dst_port = serverPort;
udpHdr->udp_len = SWAP16(8 + tftpLength);
udpHdr->udp_cksum = 0;
memcpy((char *)udpHdr+8, tftpData, tftpLength);
t_checksum = IP_checksum((unsigned short*)ipHdr + 6, (16 + tftpLength));
t_checksum = (~t_checksum) & 0xFFFF;
t_checksum += 25 + tftpLength;
t_checksum = (t_checksum & 0xffff) + (t_checksum >> 16);
t_checksum = (~t_checksum) & 0xFFFF;
udpHdr->udp_cksum = SWAP16(t_checksum);
while (!(*AT91C_EMAC_TSR & AT91C_EMAC_BNQ)) ;
*AT91C_EMAC_TSR |= AT91C_EMAC_COMP;
*AT91C_EMAC_TAR = (unsigned)tftpSendPacket;
*AT91C_EMAC_TCR = 42 + tftpLength;
}
/*
* .KB_C_FN_DEFINITION_START
* void TFTP_RequestFile(char *filename)
* This private function sends a RRQ packet to the server.
* .KB_C_FN_DEFINITION_END
*/
static void
TFTP_RequestFile(char *filename)
{
tftp_header_t tftpHeader;
char *cPtr, *ePtr, *mPtr;
unsigned length;
tftpHeader.opcode = TFTP_RRQ_OPCODE;
cPtr = (char*)&(tftpHeader.block_num);
ePtr = strcpy(cPtr, filename);
mPtr = strcpy(ePtr, "octet");
length = mPtr - cPtr;
length += 2;
Send_TFTP_Packet((char*)&tftpHeader, length);
}
/*
* .KB_C_FN_DEFINITION_START
* void TFTP_ACK_Data(char *data, unsigned short block_num, unsigned short len)
* This private function sends an ACK packet to the server.
* .KB_C_FN_DEFINITION_END
*/
static void
TFTP_ACK_Data(unsigned char *data, unsigned short block_num, unsigned short len)
{
tftp_header_t tftpHeader;
if (block_num == (ackBlock + 1)) {
++ackBlock;
memcpy(dlAddress, data, len);
dlAddress += len;
lastSize += len;
if (ackBlock % 128 == 0)
printf("tftp: %u kB\r", lastSize / 1024);
}
tftpHeader.opcode = TFTP_ACK_OPCODE;
tftpHeader.block_num = SWAP16(ackBlock);
Send_TFTP_Packet((char*)&tftpHeader, 4);
if (len < 512) {
ackBlock = -2;
printf("tftp: %u byte\n", lastSize);
}
}
/*
* .KB_C_FN_DEFINITION_START
* void CheckForNewPacket(ip_header_t *pHeader)
* This private function polls for received ethernet packets and handles
* any here.
* .KB_C_FN_DEFINITION_END
*/
static int
CheckForNewPacket(ip_header_t *pHeader)
{
unsigned short *pFrameType;
unsigned i;
char *pData;
ip_header_t *pIpHeader;
arp_header_t *p_ARP;
int process = 0;
process = 0;
for (i = 0; i < MAX_RX_PACKETS; ++i) {
if(p_rxBD[i].address & 0x1) {
process = 1;
(*AT91C_EMAC_RSR) |= (*AT91C_EMAC_RSR);
break;
}
}
if (!process)
return (0);
process = i;
pFrameType = (unsigned short *)((p_rxBD[i].address & 0xFFFFFFFC) + 12);
pData = (char *)(p_rxBD[i].address & 0xFFFFFFFC);
switch (*pFrameType) {
case SWAP16(PROTOCOL_ARP):
p_ARP = (arp_header_t*)pData;
if (p_ARP->operation == SWAP16(ARP_REPLY)) {
// check if new server info is available
if ((!serverMACSet) &&
(!(p_memcmp((char*)p_ARP->sender_ip,
(char*)serverIPAddr, 4)))) {
serverMACSet = 1;
memcpy(serverMACAddr, p_ARP->sender_mac, 6);
}
} else if (p_ARP->operation == SWAP16(ARP_REQUEST)) {
// ARP REPLY operation
p_ARP->operation = SWAP16(ARP_REPLY);
// Fill the dest address and src address
for (i = 0; i <6; i++) {
// swap ethernet dest address and ethernet src address
pData[i] = pData[i+6];
pData[i+6] = localMACAddr[i];
// swap sender ethernet address and target ethernet address
pData[i+22] = localMACAddr[i];
pData[i+32] = pData[i+6];
}
// swap sender IP address and target IP address
for (i = 0; i<4; i++) {
pData[i+38] = pData[i+28];
pData[i+28] = localIPAddr[i];
}
if (!(*AT91C_EMAC_TSR & AT91C_EMAC_BNQ)) break;
*AT91C_EMAC_TSR |= AT91C_EMAC_COMP;
*AT91C_EMAC_TAR = (unsigned)pData;
*AT91C_EMAC_TCR = 0x40;
}
break;
case SWAP16(PROTOCOL_IP):
pIpHeader = (ip_header_t*)(pData + 14);
memcpy(pHeader, pIpHeader, sizeof(ip_header_t));
if (pIpHeader->ip_p == PROTOCOL_UDP) {
udp_header_t *udpHdr;
tftp_header_t *tftpHdr;
udpHdr = (udp_header_t*)((char*)pIpHeader+20);
tftpHdr = (tftp_header_t*)((char*)udpHdr + 8);
if (udpHdr->dst_port != localPort)
break;
if (tftpHdr->opcode != TFTP_DATA_OPCODE)
break;
if (ackBlock == -1) {
if (tftpHdr->block_num != SWAP16(1))
break;
serverPort = udpHdr->src_port;
ackBlock = 0;
}
if (serverPort != udpHdr->src_port)
break;
TFTP_ACK_Data(tftpHdr->data,
SWAP16(tftpHdr->block_num),
SWAP16(udpHdr->udp_len) - 12);
}
}
p_rxBD[process].address &= ~0x01;
return (1);
}
/*
* .KB_C_FN_DEFINITION_START
* unsigned short AT91F_MII_ReadPhy (AT91PS_EMAC pEmac, unsigned char addr)
* This private function reads the PHY device.
* .KB_C_FN_DEFINITION_END
*/
#ifndef BOOT_BWCT
static unsigned short
AT91F_MII_ReadPhy (AT91PS_EMAC pEmac, unsigned char addr)
{
unsigned value = 0x60020000 | (addr << 18);
pEmac->EMAC_CTL |= AT91C_EMAC_MPE;
pEmac->EMAC_MAN = value;
while(!((pEmac->EMAC_SR) & AT91C_EMAC_IDLE));
pEmac->EMAC_CTL &= ~AT91C_EMAC_MPE;
return (pEmac->EMAC_MAN & 0x0000ffff);
}
#endif
/*
* .KB_C_FN_DEFINITION_START
* unsigned short AT91F_MII_WritePhy (AT91PS_EMAC pEmac, unsigned char addr, unsigned short s)
* This private function writes the PHY device.
* .KB_C_FN_DEFINITION_END
*/
#ifdef BOOT_TSC
static unsigned short
AT91F_MII_WritePhy (AT91PS_EMAC pEmac, unsigned char addr, unsigned short s)
{
unsigned value = 0x50020000 | (addr << 18) | s;
pEmac->EMAC_CTL |= AT91C_EMAC_MPE;
pEmac->EMAC_MAN = value;
while(!((pEmac->EMAC_SR) & AT91C_EMAC_IDLE));
pEmac->EMAC_CTL &= ~AT91C_EMAC_MPE;
return (pEmac->EMAC_MAN & 0x0000ffff);
}
#endif
/*
* .KB_C_FN_DEFINITION_START
* void MII_GetLinkSpeed(AT91PS_EMAC pEmac)
* This private function determines the link speed set by the PHY.
* .KB_C_FN_DEFINITION_END
*/
static void
MII_GetLinkSpeed(AT91PS_EMAC pEmac)
{
#if defined(BOOT_TSC) || defined(BOOT_KB920X) || defined(BOOT_CENTIPAD)
unsigned short stat2;
#endif
unsigned update;
#ifdef BOOT_TSC
unsigned sec;
int i;
#endif
#ifdef BOOT_BWCT
/* hardcoded link speed since we connect a switch via MII */
update = pEmac->EMAC_CFG & ~(AT91C_EMAC_SPD | AT91C_EMAC_FD);
update |= AT91C_EMAC_SPD;
update |= AT91C_EMAC_FD;
#endif
#if defined(BOOT_KB920X) || defined(BOOT_CENTIPAD)
stat2 = AT91F_MII_ReadPhy(pEmac, MII_STS2_REG);
if (!(stat2 & MII_STS2_LINK))
return ;
update = pEmac->EMAC_CFG & ~(AT91C_EMAC_SPD | AT91C_EMAC_FD);
if (stat2 & MII_STS2_100TX)
update |= AT91C_EMAC_SPD;
if (stat2 & MII_STS2_FDX)
update |= AT91C_EMAC_FD;
#endif
#ifdef BOOT_TSC
while (1) {
for (i = 0; i < 10; i++) {
stat2 = AT91F_MII_ReadPhy(pEmac, MII_STS_REG);
if (stat2 & MII_STS_LINK_STAT)
break;
printf(".");
sec = GetSeconds();
while (GetSeconds() == sec)
continue;
}
if (stat2 & MII_STS_LINK_STAT)
break;
printf("Resetting MII...");
AT91F_MII_WritePhy(pEmac, 0x0, 0x8000);
while (AT91F_MII_ReadPhy(pEmac, 0x0) & 0x8000) continue;
}
printf("emac: link");
stat2 = AT91F_MII_ReadPhy(pEmac, MII_SPEC_STS_REG);
update = pEmac->EMAC_CFG & ~(AT91C_EMAC_SPD | AT91C_EMAC_FD);
if (stat2 & (MII_SSTS_100FDX | MII_SSTS_100HDX)) {
printf(" 100TX");
update |= AT91C_EMAC_SPD;
}
if (stat2 & (MII_SSTS_100FDX | MII_SSTS_10FDX)) {
printf(" FDX");
update |= AT91C_EMAC_FD;
}
printf("\n");
#endif
pEmac->EMAC_CFG = update;
}
/*
* .KB_C_FN_DEFINITION_START
* void AT91F_EmacEntry(void)
* This private function initializes the EMAC on the chip.
* .KB_C_FN_DEFINITION_END
*/
static void
AT91F_EmacEntry(void)
{
unsigned i;
char *pRxPacket = (char*)RX_DATA_START;
AT91PS_EMAC pEmac = AT91C_BASE_EMAC;
p_rxBD = (receive_descriptor_t*)RX_BUFFER_START;
localPort = SWAP16(0x8002);
for (i = 0; i < MAX_RX_PACKETS; ++i) {
p_rxBD[i].address = (unsigned)pRxPacket;
p_rxBD[i].size = 0;
pRxPacket += RX_PACKET_SIZE;
}
// Set the WRAP bit at the end of the list descriptor
p_rxBD[MAX_RX_PACKETS-1].address |= 0x02;
if (!(pEmac->EMAC_SR & AT91C_EMAC_LINK))
MII_GetLinkSpeed(pEmac);
pEmac->EMAC_RBQP = (unsigned) p_rxBD;
pEmac->EMAC_RSR |= (AT91C_EMAC_OVR | AT91C_EMAC_REC | AT91C_EMAC_BNA);
pEmac->EMAC_CTL = AT91C_EMAC_TE | AT91C_EMAC_RE;
pEmac->EMAC_TAR = (unsigned)transmitBuffer;
}
/* ************************** GLOBAL FUNCTIONS ********************************/
/*
* .KB_C_FN_DEFINITION_START
* void SetServerIPAddress(unsigned address)
* This global function sets the IP of the TFTP download server.
* .KB_C_FN_DEFINITION_END
*/
void
SetServerIPAddress(unsigned address)
{
// force update in case the IP has changed
serverMACSet = 0;
serverIPAddr[0] = (address >> 24) & 0xFF;
serverIPAddr[1] = (address >> 16) & 0xFF;
serverIPAddr[2] = (address >> 8) & 0xFF;
serverIPAddr[3] = (address >> 0) & 0xFF;
serverIPSet = 1;
}
/*
* .KB_C_FN_DEFINITION_START
* void SetLocalIPAddress(unsigned address)
* This global function sets the IP of this module.
* .KB_C_FN_DEFINITION_END
*/
void
SetLocalIPAddress(unsigned address)
{
// force update in case the IP has changed
serverMACSet = 0;
localIPAddr[0] = (address >> 24) & 0xFF;
localIPAddr[1] = (address >> 16) & 0xFF;
localIPAddr[2] = (address >> 8) & 0xFF;
localIPAddr[3] = (address >> 0) & 0xFF;
localIPSet = 1;
}
/*
* .KB_C_FN_DEFINITION_START
* void TFTP_Download(unsigned address, char *filename)
* This global function initiates and processes a tftp download request.
* The server IP, local IP, local MAC must be set before this function is
* executed.
* .KB_C_FN_DEFINITION_END
*/
void
TFTP_Download(unsigned address, char *filename)
{
ip_header_t IpHeader;
unsigned thisSeconds;
int timeout;
if ((!localMACSet) || (!localIPSet) || (!serverIPSet))
return ;
AT91F_EmacEntry();
GetServerAddress();
dlAddress = (char*)address;
lastSize = 0;
timeout = 10;
thisSeconds = (GetSeconds() + 2) % 32;
serverPort = SWAP16(69);
++localPort;
ackBlock = -1;
while (timeout) {
if (CheckForNewPacket(&IpHeader)) {
if (ackBlock == -2)
break;
timeout = 10;
thisSeconds = (GetSeconds() + 2) % 32;
} else if (GetSeconds() == thisSeconds) {
--timeout;
thisSeconds = (GetSeconds() + 2) % 32;
if (!serverMACSet)
GetServerAddress();
else if (ackBlock == -1)
TFTP_RequestFile(filename);
else {
// Be sure to send a NAK, which is done by
// ACKing the last block we got.
TFTP_ACK_Data(0, ackBlock, 512);
printf("\nNAK %u\n", ackBlock);
}
}
}
if (timeout == 0)
printf("TFTP TIMEOUT!\n");
}