u-boot/drivers/net/xilinx_emaclite.c

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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 <malloc.h>
#include <asm/io.h>
#undef DEBUG
#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
struct xemaclite {
u32 nexttxbuffertouse; /* Next TX buffer to write to */
u32 nextrxbuffertouse; /* Next RX buffer to read from */
u32 txpp; /* TX ping pong buffer */
u32 rxpp; /* RX ping pong buffer */
};
static u32 etherrxbuff[PKTSIZE_ALIGN/4]; /* Receive buffer */
static void xemaclite_alignedread(u32 *srcptr, void *destptr, u32 bytecount)
{
u32 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++;
}
static void xemaclite_alignedwrite(void *srcptr, u32 destptr, u32 bytecount)
{
u32 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;
}
static void emaclite_halt(struct eth_device *dev)
{
debug("eth_halt\n");
}
static int emaclite_init(struct eth_device *dev, bd_t *bis)
{
struct xemaclite *emaclite = dev->priv;
debug("EmacLite Initialization Started\n");
/*
* TX - TX_PING & TX_PONG initialization
*/
/* Restart PING TX */
out_be32 (dev->iobase + XEL_TSR_OFFSET, 0);
/* Copy MAC address */
xemaclite_alignedwrite(dev->enetaddr, dev->iobase, ENET_ADDR_LENGTH);
/* Set the length */
out_be32 (dev->iobase + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH);
/* Update the MAC address in the EMAC Lite */
out_be32 (dev->iobase + XEL_TSR_OFFSET, XEL_TSR_PROG_MAC_ADDR);
/* Wait for EMAC Lite to finish with the MAC address update */
while ((in_be32 (dev->iobase + XEL_TSR_OFFSET) &
XEL_TSR_PROG_MAC_ADDR) != 0)
;
if (emaclite->txpp) {
/* The same operation with PONG TX */
out_be32 (dev->iobase + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET, 0);
xemaclite_alignedwrite(dev->enetaddr, dev->iobase +
XEL_BUFFER_OFFSET, ENET_ADDR_LENGTH);
out_be32 (dev->iobase + XEL_TPLR_OFFSET, ENET_ADDR_LENGTH);
out_be32 (dev->iobase + XEL_TSR_OFFSET + XEL_BUFFER_OFFSET,
XEL_TSR_PROG_MAC_ADDR);
while ((in_be32 (dev->iobase + XEL_TSR_OFFSET +
XEL_BUFFER_OFFSET) & XEL_TSR_PROG_MAC_ADDR) != 0)
;
}
/*
* RX - RX_PING & RX_PONG initialization
*/
/* Write out the value to flush the RX buffer */
out_be32 (dev->iobase + XEL_RSR_OFFSET, XEL_RSR_RECV_IE_MASK);
if (emaclite->rxpp)
out_be32 (dev->iobase + XEL_RSR_OFFSET + XEL_BUFFER_OFFSET,
XEL_RSR_RECV_IE_MASK);
debug("EmacLite Initialization complete\n");
return 0;
}
static int xemaclite_txbufferavailable(struct eth_device *dev)
{
u32 reg;
u32 txpingbusy;
u32 txpongbusy;
struct xemaclite *emaclite = dev->priv;
/*
* Read the other buffer register
* and determine if the other buffer is available
*/
reg = in_be32 (dev->iobase +
emaclite->nexttxbuffertouse + 0);
txpingbusy = ((reg & XEL_TSR_XMIT_BUSY_MASK) ==
XEL_TSR_XMIT_BUSY_MASK);
reg = in_be32 (dev->iobase +
(emaclite->nexttxbuffertouse ^ XEL_TSR_OFFSET) + 0);
txpongbusy = ((reg & XEL_TSR_XMIT_BUSY_MASK) ==
XEL_TSR_XMIT_BUSY_MASK);
return !(txpingbusy && txpongbusy);
}
static int emaclite_send(struct eth_device *dev, volatile void *ptr, int len)
{
u32 reg;
u32 baseaddress;
struct xemaclite *emaclite = dev->priv;
u32 maxtry = 1000;
if (len > PKTSIZE)
len = PKTSIZE;
while (!xemaclite_txbufferavailable(dev) && maxtry) {
udelay(10);
maxtry--;
}
if (!maxtry) {
printf("Error: Timeout waiting for ethernet TX buffer\n");
/* Restart PING TX */
out_be32 (dev->iobase + XEL_TSR_OFFSET, 0);
if (emaclite->txpp) {
out_be32 (dev->iobase + XEL_TSR_OFFSET +
XEL_BUFFER_OFFSET, 0);
}
return -1;
}
/* Determine the expected TX buffer address */
baseaddress = (dev->iobase + 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)) {
if (emaclite->txpp)
emaclite->nexttxbuffertouse ^= XEL_BUFFER_OFFSET;
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 0;
}
if (emaclite->txpp) {
/* 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 0;
}
}
puts("Error while sending frame\n");
return -1;
}
static int emaclite_recv(struct eth_device *dev)
{
u32 length;
u32 reg;
u32 baseaddress;
struct xemaclite *emaclite = dev->priv;
baseaddress = dev->iobase + 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) {
if (emaclite->rxpp)
emaclite->nextrxbuffertouse ^= XEL_BUFFER_OFFSET;
} else {
if (!emaclite->rxpp) {
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;
}
}
}
/* 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 = PKTSIZE;
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 length;
}
int xilinx_emaclite_initialize(bd_t *bis, unsigned long base_addr,
int txpp, int rxpp)
{
struct eth_device *dev;
struct xemaclite *emaclite;
dev = calloc(1, sizeof(*dev));
if (dev == NULL)
return -1;
emaclite = calloc(1, sizeof(struct xemaclite));
if (emaclite == NULL) {
free(dev);
return -1;
}
dev->priv = emaclite;
emaclite->txpp = txpp;
emaclite->rxpp = rxpp;
sprintf(dev->name, "Xelite.%lx", base_addr);
dev->iobase = base_addr;
dev->init = emaclite_init;
dev->halt = emaclite_halt;
dev->send = emaclite_send;
dev->recv = emaclite_recv;
eth_register(dev);
return 1;
}