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/*
* (C) Copyright 2007-2009 Michal Simek
* (C) Copyright 2003 Xilinx Inc.
*
* Michal SIMEK <monstr@monstr.eu>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <net.h>
#include <config.h>
#include <asm/io.h>
#undef DEBUG
#define ENET_MAX_MTU PKTSIZE
#define ENET_MAX_MTU_ALIGNED PKTSIZE_ALIGN
#define ENET_ADDR_LENGTH 6
/* EmacLite constants */
#define XEL_BUFFER_OFFSET 0x0800 /* Next buffer's offset */
#define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */
#define XEL_TSR_OFFSET 0x07FC /* Tx status */
#define XEL_RSR_OFFSET 0x17FC /* Rx status */
#define XEL_RXBUFF_OFFSET 0x1000 /* Receive Buffer */
/* Xmit complete */
#define XEL_TSR_XMIT_BUSY_MASK 0x00000001UL
/* Xmit interrupt enable bit */
#define XEL_TSR_XMIT_IE_MASK 0x00000008UL
/* Buffer is active, SW bit only */
#define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000UL
/* Program the MAC address */
#define XEL_TSR_PROGRAM_MASK 0x00000002UL
/* define for programming the MAC address into the EMAC Lite */
#define XEL_TSR_PROG_MAC_ADDR (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK)
/* Transmit packet length upper byte */
#define XEL_TPLR_LENGTH_MASK_HI 0x0000FF00UL
/* Transmit packet length lower byte */
#define XEL_TPLR_LENGTH_MASK_LO 0x000000FFUL
/* Recv complete */
#define XEL_RSR_RECV_DONE_MASK 0x00000001UL
/* Recv interrupt enable bit */
#define XEL_RSR_RECV_IE_MASK 0x00000008UL
typedef struct {
unsigned int baseaddress; /* Base address for device (IPIF) */
unsigned int nexttxbuffertouse; /* Next TX buffer to write to */
unsigned int nextrxbuffertouse; /* Next RX buffer to read from */
unsigned char deviceid; /* Unique ID of device - for future */
} xemaclite;
static xemaclite emaclite;
static u32 etherrxbuff[PKTSIZE_ALIGN/4]; /* Receive buffer */
/* hardcoded MAC address for the Xilinx EMAC Core when env is nowhere*/
#ifdef CONFIG_ENV_IS_NOWHERE
static u8 emacaddr[ENET_ADDR_LENGTH] = { 0x00, 0x0a, 0x35, 0x00, 0x22, 0x01 };
#else
static u8 emacaddr[ENET_ADDR_LENGTH];
#endif
void xemaclite_alignedread (u32 * srcptr, void *destptr, unsigned bytecount)
{
unsigned int i;
u32 alignbuffer;
u32 *to32ptr;
u32 *from32ptr;
u8 *to8ptr;
u8 *from8ptr;
from32ptr = (u32 *) srcptr;
/* Word aligned buffer, no correction needed. */
to32ptr = (u32 *) destptr;
while (bytecount > 3) {
*to32ptr++ = *from32ptr++;
bytecount -= 4;
}
to8ptr = (u8 *) to32ptr;
alignbuffer = *from32ptr++;
from8ptr = (u8 *) & alignbuffer;
for (i = 0; i < bytecount; i++) {
*to8ptr++ = *from8ptr++;
}
}
void xemaclite_alignedwrite (void *srcptr, u32 destptr, unsigned bytecount)
{
unsigned i;
u32 alignbuffer;
u32 *to32ptr = (u32 *) destptr;
u32 *from32ptr;
u8 *to8ptr;
u8 *from8ptr;
from32ptr = (u32 *) srcptr;
while (bytecount > 3) {
*to32ptr++ = *from32ptr++;
bytecount -= 4;
}
alignbuffer = 0;
to8ptr = (u8 *) & alignbuffer;
from8ptr = (u8 *) from32ptr;
for (i = 0; i < bytecount; i++) {
*to8ptr++ = *from8ptr++;
}
*to32ptr++ = alignbuffer;
}
void eth_halt (void)
{
debug ("eth_halt\n");
}
int eth_init (bd_t * bis)
{
uchar enetaddr[6];
debug ("EmacLite Initialization Started\n");
memset (&emaclite, 0, sizeof (xemaclite));
emaclite.baseaddress = XILINX_EMACLITE_BASEADDR;
if (!eth_getenv_enetaddr("ethaddr", enetaddr)) {
memcpy(enetaddr, emacaddr, ENET_ADDR_LENGTH);
eth_setenv_enetaddr("ethaddr", enetaddr);
}
/*
* TX - TX_PING & TX_PONG initialization
*/
/* Restart PING TX */
out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET, 0);
/* Copy MAC address */
xemaclite_alignedwrite (enetaddr,
emaclite.baseaddress, ENET_ADDR_LENGTH);
/* Set the length */
out_be32 (emaclite.baseaddress + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH);
/* Update the MAC address in the EMAC Lite */
out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET, XEL_TSR_PROG_MAC_ADDR);
/* Wait for EMAC Lite to finish with the MAC address update */
while ((in_be32 (emaclite.baseaddress + XEL_TSR_OFFSET) &
XEL_TSR_PROG_MAC_ADDR) != 0) ;
#ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG
/* The same operation with PONG TX */
out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET, 0);
xemaclite_alignedwrite (enetaddr, emaclite.baseaddress +
XEL_BUFFER_OFFSET, ENET_ADDR_LENGTH);
out_be32 (emaclite.baseaddress + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH);
out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET,
XEL_TSR_PROG_MAC_ADDR);
while ((in_be32 (emaclite.baseaddress + XEL_TSR_OFFSET +
XEL_BUFFER_OFFSET) & XEL_TSR_PROG_MAC_ADDR) != 0) ;
#endif
/*
* RX - RX_PING & RX_PONG initialization
*/
/* Write out the value to flush the RX buffer */
out_be32 (emaclite.baseaddress + XEL_RSR_OFFSET, XEL_RSR_RECV_IE_MASK);
#ifdef CONFIG_XILINX_EMACLITE_RX_PING_PONG
out_be32 (emaclite.baseaddress + XEL_RSR_OFFSET + XEL_BUFFER_OFFSET,
XEL_RSR_RECV_IE_MASK);
#endif
debug ("EmacLite Initialization complete\n");
return 0;
}
int xemaclite_txbufferavailable (xemaclite * instanceptr)
{
u32 reg;
u32 txpingbusy;
u32 txpongbusy;
/*
* Read the other buffer register
* and determine if the other buffer is available
*/
reg = in_be32 (instanceptr->baseaddress +
instanceptr->nexttxbuffertouse + 0);
txpingbusy = ((reg & XEL_TSR_XMIT_BUSY_MASK) ==
XEL_TSR_XMIT_BUSY_MASK);
reg = in_be32 (instanceptr->baseaddress +
(instanceptr->nexttxbuffertouse ^ XEL_TSR_OFFSET) + 0);
txpongbusy = ((reg & XEL_TSR_XMIT_BUSY_MASK) ==
XEL_TSR_XMIT_BUSY_MASK);
return (!(txpingbusy && txpongbusy));
}
int eth_send (volatile void *ptr, int len) {
unsigned int reg;
unsigned int baseaddress;
unsigned maxtry = 1000;
if (len > ENET_MAX_MTU)
len = ENET_MAX_MTU;
while (!xemaclite_txbufferavailable (&emaclite) && maxtry) {
udelay (10);
maxtry--;
}
if (!maxtry) {
printf ("Error: Timeout waiting for ethernet TX buffer\n");
/* Restart PING TX */
out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET, 0);
#ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG
out_be32 (emaclite.baseaddress + XEL_TSR_OFFSET +
XEL_BUFFER_OFFSET, 0);
#endif
return 0;
}
/* Determine the expected TX buffer address */
baseaddress = (emaclite.baseaddress + emaclite.nexttxbuffertouse);
/* Determine if the expected buffer address is empty */
reg = in_be32 (baseaddress + XEL_TSR_OFFSET);
if (((reg & XEL_TSR_XMIT_BUSY_MASK) == 0)
&& ((in_be32 ((baseaddress) + XEL_TSR_OFFSET)
& XEL_TSR_XMIT_ACTIVE_MASK) == 0)) {
#ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG
emaclite.nexttxbuffertouse ^= XEL_BUFFER_OFFSET;
#endif
debug ("Send packet from 0x%x\n", baseaddress);
/* Write the frame to the buffer */
xemaclite_alignedwrite ((void *) ptr, baseaddress, len);
out_be32 (baseaddress + XEL_TPLR_OFFSET,(len &
(XEL_TPLR_LENGTH_MASK_HI | XEL_TPLR_LENGTH_MASK_LO)));
reg = in_be32 (baseaddress + XEL_TSR_OFFSET);
reg |= XEL_TSR_XMIT_BUSY_MASK;
if ((reg & XEL_TSR_XMIT_IE_MASK) != 0) {
reg |= XEL_TSR_XMIT_ACTIVE_MASK;
}
out_be32 (baseaddress + XEL_TSR_OFFSET, reg);
return 1;
}
#ifdef CONFIG_XILINX_EMACLITE_TX_PING_PONG
/* Switch to second buffer */
baseaddress ^= XEL_BUFFER_OFFSET;
/* Determine if the expected buffer address is empty */
reg = in_be32 (baseaddress + XEL_TSR_OFFSET);
if (((reg & XEL_TSR_XMIT_BUSY_MASK) == 0)
&& ((in_be32 ((baseaddress) + XEL_TSR_OFFSET)
& XEL_TSR_XMIT_ACTIVE_MASK) == 0)) {
debug ("Send packet from 0x%x\n", baseaddress);
/* Write the frame to the buffer */
xemaclite_alignedwrite ((void *) ptr, baseaddress, len);
out_be32 (baseaddress + XEL_TPLR_OFFSET,(len &
(XEL_TPLR_LENGTH_MASK_HI | XEL_TPLR_LENGTH_MASK_LO)));
reg = in_be32 (baseaddress + XEL_TSR_OFFSET);
reg |= XEL_TSR_XMIT_BUSY_MASK;
if ((reg & XEL_TSR_XMIT_IE_MASK) != 0) {
reg |= XEL_TSR_XMIT_ACTIVE_MASK;
}
out_be32 (baseaddress + XEL_TSR_OFFSET, reg);
return 1;
}
#endif
puts ("Error while sending frame\n");
return 0;
}
int eth_rx (void)
{
unsigned int length;
unsigned int reg;
unsigned int baseaddress;
baseaddress = emaclite.baseaddress + emaclite.nextrxbuffertouse;
reg = in_be32 (baseaddress + XEL_RSR_OFFSET);
debug ("Testing data at address 0x%x\n", baseaddress);
if ((reg & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
#ifdef CONFIG_XILINX_EMACLITE_RX_PING_PONG
emaclite.nextrxbuffertouse ^= XEL_BUFFER_OFFSET;
#endif
} else {
#ifndef CONFIG_XILINX_EMACLITE_RX_PING_PONG
debug ("No data was available - address 0x%x\n", baseaddress);
return 0;
#else
baseaddress ^= XEL_BUFFER_OFFSET;
reg = in_be32 (baseaddress + XEL_RSR_OFFSET);
if ((reg & XEL_RSR_RECV_DONE_MASK) !=
XEL_RSR_RECV_DONE_MASK) {
debug ("No data was available - address 0x%x\n",
baseaddress);
return 0;
}
#endif
}
/* Get the length of the frame that arrived */
switch(((ntohl(in_be32 (baseaddress + XEL_RXBUFF_OFFSET + 0xC))) &
0xFFFF0000 ) >> 16) {
case 0x806:
length = 42 + 20; /* FIXME size of ARP */
debug ("ARP Packet\n");
break;
case 0x800:
length = 14 + 14 +
(((ntohl(in_be32 (baseaddress + XEL_RXBUFF_OFFSET + 0x10))) &
0xFFFF0000) >> 16); /* FIXME size of IP packet */
debug ("IP Packet\n");
break;
default:
debug ("Other Packet\n");
length = ENET_MAX_MTU;
break;
}
xemaclite_alignedread ((u32 *) (baseaddress + XEL_RXBUFF_OFFSET),
etherrxbuff, length);
/* Acknowledge the frame */
reg = in_be32 (baseaddress + XEL_RSR_OFFSET);
reg &= ~XEL_RSR_RECV_DONE_MASK;
out_be32 (baseaddress + XEL_RSR_OFFSET, reg);
debug ("Packet receive from 0x%x, length %dB\n", baseaddress, length);
NetReceive ((uchar *) etherrxbuff, length);
return 1;
}
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