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/*
* ks8695eth.c -- KS8695 ethernet driver
*
* (C) Copyright 2004-2005, Greg Ungerer <greg.ungerer@opengear.com>
*
* 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 <malloc.h>
#include <net.h>
#include <asm/io.h>
#include <asm/arch/platform.h>
/****************************************************************************/
/*
* Hardware register access to the KS8695 LAN ethernet port
* (well, it is the 4 port switch really).
*/
#define ks8695_read(a) *((volatile unsigned long *) (KS8695_IO_BASE + (a)))
#define ks8695_write(a,v) *((volatile unsigned long *) (KS8695_IO_BASE + (a))) = (v)
/****************************************************************************/
/*
* Define the descriptor in-memory data structures.
*/
struct ks8695_txdesc {
uint32_t owner;
uint32_t ctrl;
uint32_t addr;
uint32_t next;
};
struct ks8695_rxdesc {
uint32_t status;
uint32_t ctrl;
uint32_t addr;
uint32_t next;
};
/****************************************************************************/
/*
* Allocate local data structures to use for receiving and sending
* packets. Just to keep it all nice and simple.
*/
#define TXDESCS 4
#define RXDESCS 4
#define BUFSIZE 2048
volatile struct ks8695_txdesc ks8695_tx[TXDESCS] __attribute__((aligned(256)));
volatile struct ks8695_rxdesc ks8695_rx[RXDESCS] __attribute__((aligned(256)));
volatile uint8_t ks8695_bufs[BUFSIZE*(TXDESCS+RXDESCS)] __attribute__((aligned(2048)));;
/****************************************************************************/
/*
* Ideally we want to use the MAC address stored in flash.
* But we do some sanity checks in case they are not present
* first.
*/
unsigned char eth_mac[] = {
0x00, 0x13, 0xc6, 0x00, 0x00, 0x00
};
void ks8695_getmac(void)
{
unsigned char *fp;
int i;
/* Check if flash MAC is valid */
fp = (unsigned char *) 0x0201c000;
for (i = 0; (i < 6); i++) {
if ((fp[i] != 0) && (fp[i] != 0xff))
break;
}
/* If we found a valid looking MAC address then use it */
if (i < 6)
memcpy(ð_mac[0], fp, 6);
}
/****************************************************************************/
void eth_reset(bd_t *bd)
{
int i;
debug ("%s(%d): eth_reset()\n", __FILE__, __LINE__);
/* Reset the ethernet engines first */
ks8695_write(KS8695_LAN_DMA_TX, 0x80000000);
ks8695_write(KS8695_LAN_DMA_RX, 0x80000000);
ks8695_getmac();
/* Set MAC address */
ks8695_write(KS8695_LAN_MAC_LOW, (eth_mac[5] | (eth_mac[4] << 8) |
(eth_mac[3] << 16) | (eth_mac[2] << 24)));
ks8695_write(KS8695_LAN_MAC_HIGH, (eth_mac[1] | (eth_mac[0] << 8)));
/* Turn the 4 port switch on */
i = ks8695_read(KS8695_SWITCH_CTRL0);
ks8695_write(KS8695_SWITCH_CTRL0, (i | 0x1));
/* ks8695_write(KS8695_WAN_CONTROL, 0x3f000066); */
/* Initialize descriptor rings */
for (i = 0; (i < TXDESCS); i++) {
ks8695_tx[i].owner = 0;
ks8695_tx[i].ctrl = 0;
ks8695_tx[i].addr = (uint32_t) &ks8695_bufs[i*BUFSIZE];
ks8695_tx[i].next = (uint32_t) &ks8695_tx[i+1];
}
ks8695_tx[TXDESCS-1].ctrl = 0x02000000;
ks8695_tx[TXDESCS-1].next = (uint32_t) &ks8695_tx[0];
for (i = 0; (i < RXDESCS); i++) {
ks8695_rx[i].status = 0x80000000;
ks8695_rx[i].ctrl = BUFSIZE - 4;
ks8695_rx[i].addr = (uint32_t) &ks8695_bufs[(i+TXDESCS)*BUFSIZE];
ks8695_rx[i].next = (uint32_t) &ks8695_rx[i+1];
}
ks8695_rx[RXDESCS-1].ctrl |= 0x00080000;
ks8695_rx[RXDESCS-1].next = (uint32_t) &ks8695_rx[0];
/* The KS8695 is pretty slow reseting the ethernets... */
udelay(2000000);
/* Enable the ethernet engine */
ks8695_write(KS8695_LAN_TX_LIST, (uint32_t) &ks8695_tx[0]);
ks8695_write(KS8695_LAN_RX_LIST, (uint32_t) &ks8695_rx[0]);
ks8695_write(KS8695_LAN_DMA_TX, 0x3);
ks8695_write(KS8695_LAN_DMA_RX, 0x71);
ks8695_write(KS8695_LAN_DMA_RX_START, 0x1);
printf("KS8695 ETHERNET: ");
for (i = 0; (i < 5); i++) {
bd->bi_enetaddr[i] = eth_mac[i];
printf("%02x:", eth_mac[i]);
}
bd->bi_enetaddr[i] = eth_mac[i];
printf("%02x\n", eth_mac[i]);
}
/****************************************************************************/
int eth_init(bd_t *bd)
{
debug ("%s(%d): eth_init()\n", __FILE__, __LINE__);
eth_reset(bd);
return 0;
}
/****************************************************************************/
void eth_halt(void)
{
debug ("%s(%d): eth_halt()\n", __FILE__, __LINE__);
/* Reset the ethernet engines */
ks8695_write(KS8695_LAN_DMA_TX, 0x80000000);
ks8695_write(KS8695_LAN_DMA_RX, 0x80000000);
}
/****************************************************************************/
int eth_rx(void)
{
volatile struct ks8695_rxdesc *dp;
int i, len = 0;
debug ("%s(%d): eth_rx()\n", __FILE__, __LINE__);
for (i = 0; (i < RXDESCS); i++) {
dp= &ks8695_rx[i];
if ((dp->status & 0x80000000) == 0) {
len = (dp->status & 0x7ff) - 4;
NetReceive((void *) dp->addr, len);
dp->status = 0x80000000;
ks8695_write(KS8695_LAN_DMA_RX_START, 0x1);
break;
}
}
return len;
}
/****************************************************************************/
int eth_send(volatile void *packet, int len)
{
volatile struct ks8695_txdesc *dp;
static int next = 0;
debug ("%s(%d): eth_send(packet=%x,len=%d)\n", __FILE__, __LINE__,
packet, len);
dp = &ks8695_tx[next];
memcpy((void *) dp->addr, (void *) packet, len);
if (len < 64) {
memset((void *) (dp->addr + len), 0, 64-len);
len = 64;
}
dp->ctrl = len | 0xe0000000;
dp->owner = 0x80000000;
ks8695_write(KS8695_LAN_DMA_TX, 0x3);
ks8695_write(KS8695_LAN_DMA_TX_START, 0x1);
if (++next >= TXDESCS)
next = 0;
return len;
}
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