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239 lines
6.2 KiB
C
239 lines
6.2 KiB
C
/*
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* ks8695eth.c -- KS8695 ethernet driver
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*
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* (C) Copyright 2004-2005, Greg Ungerer <greg.ungerer@opengear.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef CONFIG_DRIVER_KS8695ETH
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/****************************************************************************/
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#include <common.h>
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#include <malloc.h>
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#include <net.h>
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#include <asm/io.h>
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#include <asm/arch/platform.h>
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/****************************************************************************/
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/*
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* Hardware register access to the KS8695 LAN ethernet port
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* (well, it is the 4 port switch really).
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*/
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#define ks8695_read(a) *((volatile unsigned long *) (KS8695_IO_BASE + (a)))
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#define ks8695_write(a,v) *((volatile unsigned long *) (KS8695_IO_BASE + (a))) = (v)
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/****************************************************************************/
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/*
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* Define the descriptor in-memory data structures.
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*/
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struct ks8695_txdesc {
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uint32_t owner;
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uint32_t ctrl;
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uint32_t addr;
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uint32_t next;
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};
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struct ks8695_rxdesc {
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uint32_t status;
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uint32_t ctrl;
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uint32_t addr;
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uint32_t next;
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};
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/****************************************************************************/
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/*
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* Allocate local data structures to use for receiving and sending
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* packets. Just to keep it all nice and simple.
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*/
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#define TXDESCS 4
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#define RXDESCS 4
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#define BUFSIZE 2048
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volatile struct ks8695_txdesc ks8695_tx[TXDESCS] __attribute__((aligned(256)));
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volatile struct ks8695_rxdesc ks8695_rx[RXDESCS] __attribute__((aligned(256)));
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volatile uint8_t ks8695_bufs[BUFSIZE*(TXDESCS+RXDESCS)] __attribute__((aligned(2048)));;
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/****************************************************************************/
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/*
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* Ideally we want to use the MAC address stored in flash.
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* But we do some sanity checks in case they are not present
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* first.
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*/
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unsigned char eth_mac[] = {
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0x00, 0x13, 0xc6, 0x00, 0x00, 0x00
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};
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void ks8695_getmac(void)
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{
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unsigned char *fp;
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int i;
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/* Check if flash MAC is valid */
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fp = (unsigned char *) 0x0201c000;
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for (i = 0; (i < 6); i++) {
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if ((fp[i] != 0) && (fp[i] != 0xff))
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break;
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}
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/* If we found a valid looking MAC address then use it */
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if (i < 6)
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memcpy(ð_mac[0], fp, 6);
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}
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/****************************************************************************/
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void eth_reset(bd_t *bd)
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{
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int i;
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debug ("%s(%d): eth_reset()\n", __FILE__, __LINE__);
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/* Reset the ethernet engines first */
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ks8695_write(KS8695_LAN_DMA_TX, 0x80000000);
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ks8695_write(KS8695_LAN_DMA_RX, 0x80000000);
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ks8695_getmac();
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/* Set MAC address */
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ks8695_write(KS8695_LAN_MAC_LOW, (eth_mac[5] | (eth_mac[4] << 8) |
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(eth_mac[3] << 16) | (eth_mac[2] << 24)));
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ks8695_write(KS8695_LAN_MAC_HIGH, (eth_mac[1] | (eth_mac[0] << 8)));
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/* Turn the 4 port switch on */
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i = ks8695_read(KS8695_SWITCH_CTRL0);
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ks8695_write(KS8695_SWITCH_CTRL0, (i | 0x1));
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/* ks8695_write(KS8695_WAN_CONTROL, 0x3f000066); */
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/* Initialize descriptor rings */
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for (i = 0; (i < TXDESCS); i++) {
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ks8695_tx[i].owner = 0;
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ks8695_tx[i].ctrl = 0;
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ks8695_tx[i].addr = (uint32_t) &ks8695_bufs[i*BUFSIZE];
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ks8695_tx[i].next = (uint32_t) &ks8695_tx[i+1];
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}
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ks8695_tx[TXDESCS-1].ctrl = 0x02000000;
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ks8695_tx[TXDESCS-1].next = (uint32_t) &ks8695_tx[0];
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for (i = 0; (i < RXDESCS); i++) {
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ks8695_rx[i].status = 0x80000000;
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ks8695_rx[i].ctrl = BUFSIZE - 4;
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ks8695_rx[i].addr = (uint32_t) &ks8695_bufs[(i+TXDESCS)*BUFSIZE];
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ks8695_rx[i].next = (uint32_t) &ks8695_rx[i+1];
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}
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ks8695_rx[RXDESCS-1].ctrl |= 0x00080000;
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ks8695_rx[RXDESCS-1].next = (uint32_t) &ks8695_rx[0];
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/* The KS8695 is pretty slow reseting the ethernets... */
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udelay(2000000);
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/* Enable the ethernet engine */
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ks8695_write(KS8695_LAN_TX_LIST, (uint32_t) &ks8695_tx[0]);
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ks8695_write(KS8695_LAN_RX_LIST, (uint32_t) &ks8695_rx[0]);
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ks8695_write(KS8695_LAN_DMA_TX, 0x3);
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ks8695_write(KS8695_LAN_DMA_RX, 0x71);
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ks8695_write(KS8695_LAN_DMA_RX_START, 0x1);
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printf("KS8695 ETHERNET: ");
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for (i = 0; (i < 5); i++) {
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bd->bi_enetaddr[i] = eth_mac[i];
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printf("%02x:", eth_mac[i]);
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}
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bd->bi_enetaddr[i] = eth_mac[i];
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printf("%02x\n", eth_mac[i]);
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}
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/****************************************************************************/
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int eth_init(bd_t *bd)
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{
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debug ("%s(%d): eth_init()\n", __FILE__, __LINE__);
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eth_reset(bd);
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return 0;
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}
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/****************************************************************************/
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void eth_halt(void)
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{
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debug ("%s(%d): eth_halt()\n", __FILE__, __LINE__);
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/* Reset the ethernet engines */
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ks8695_write(KS8695_LAN_DMA_TX, 0x80000000);
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ks8695_write(KS8695_LAN_DMA_RX, 0x80000000);
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}
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/****************************************************************************/
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int eth_rx(void)
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{
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volatile struct ks8695_rxdesc *dp;
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int i, len = 0;
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debug ("%s(%d): eth_rx()\n", __FILE__, __LINE__);
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for (i = 0; (i < RXDESCS); i++) {
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dp= &ks8695_rx[i];
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if ((dp->status & 0x80000000) == 0) {
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len = (dp->status & 0x7ff) - 4;
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NetReceive((void *) dp->addr, len);
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dp->status = 0x80000000;
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ks8695_write(KS8695_LAN_DMA_RX_START, 0x1);
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break;
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}
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}
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return len;
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}
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/****************************************************************************/
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int eth_send(volatile void *packet, int len)
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{
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volatile struct ks8695_txdesc *dp;
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static int next = 0;
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debug ("%s(%d): eth_send(packet=%x,len=%d)\n", __FILE__, __LINE__,
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packet, len);
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dp = &ks8695_tx[next];
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memcpy((void *) dp->addr, (void *) packet, len);
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if (len < 64) {
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memset((void *) (dp->addr + len), 0, 64-len);
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len = 64;
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}
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dp->ctrl = len | 0xe0000000;
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dp->owner = 0x80000000;
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ks8695_write(KS8695_LAN_DMA_TX, 0x3);
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ks8695_write(KS8695_LAN_DMA_TX_START, 0x1);
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if (++next >= TXDESCS)
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next = 0;
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return len;
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}
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#endif /* CONFIG_DRIVER_KS8695ETH */
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