247 lines
7.2 KiB
C
247 lines
7.2 KiB
C
/***********************************************************************
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*
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* Copyright (c) 2004 Cucy Systems (http://www.cucy.com)
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* Curt Brune <curt@cucy.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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,
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* MA 02111-1307 USA
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*
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* Description: Ethernet interface for Samsung S3C4510B SoC
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*/
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#include <common.h>
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#ifdef CONFIG_DRIVER_S3C4510_ETH
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#include <command.h>
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#include <net.h>
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#include <asm/hardware.h>
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#include "s3c4510b_eth.h"
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static TX_FrameDescriptor txFDbase[ETH_MaxTxFrames];
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static MACFrame txFrameBase[ETH_MaxTxFrames];
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static RX_FrameDescriptor rxFDbase[PKTBUFSRX];
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static ETH m_eth;
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static s32 TxFDinit( ETH *eth) {
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s32 i;
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MACFrame *txFrmBase;
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/* disable cache for access to the TX buffers */
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txFrmBase = (MACFrame *)( (u32)txFrameBase | CACHE_DISABLE_MASK);
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/* store start of Tx descriptors and set current */
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eth->m_curTX_FD = (TX_FrameDescriptor *) ((u32)txFDbase | CACHE_DISABLE_MASK);
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eth->m_baseTX_FD = eth->m_curTX_FD;
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for ( i = 0; i < ETH_MaxTxFrames; i++) {
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eth->m_baseTX_FD[i].m_frameDataPtr.bf.dataPtr = (u32)&txFrmBase[i];
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eth->m_baseTX_FD[i].m_frameDataPtr.bf.owner = 0x0; /* CPU owner */
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eth->m_baseTX_FD[i].m_opt.ui = 0x0;
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eth->m_baseTX_FD[i].m_status.ui = 0x0;
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eth->m_baseTX_FD[i].m_nextFD = ð->m_baseTX_FD[i+1];
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}
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/* make the list circular */
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eth->m_baseTX_FD[i-1].m_nextFD = ð->m_baseTX_FD[0];
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PUT_REG( REG_BDMATXPTR, (u32)eth->m_curTX_FD);
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return 0;
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}
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static s32 RxFDinit( ETH *eth) {
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s32 i;
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/* MACFrame *rxFrmBase; */
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/* disable cache for access to the RX buffers */
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/* rxFrmBase = (MACFrame *)( (u32)rxFrameBase | CACHE_DISABLE_MASK); */
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/* store start of Rx descriptors and set current */
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eth->m_curRX_FD = (RX_FrameDescriptor *)((u32)rxFDbase | CACHE_DISABLE_MASK);
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eth->m_baseRX_FD = eth->m_curRX_FD;
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for ( i = 0; i < PKTBUFSRX; i++) {
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eth->m_baseRX_FD[i].m_frameDataPtr.bf.dataPtr = (u32)NetRxPackets[i] | CACHE_DISABLE_MASK;
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eth->m_baseRX_FD[i].m_frameDataPtr.bf.owner = 0x1; /* BDMA owner */
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eth->m_baseRX_FD[i].m_reserved = 0x0;
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eth->m_baseRX_FD[i].m_status.ui = 0x0;
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eth->m_baseRX_FD[i].m_nextFD = ð->m_baseRX_FD[i+1];
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}
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/* make the list circular */
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eth->m_baseRX_FD[i-1].m_nextFD = ð->m_baseRX_FD[0];
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PUT_REG( REG_BDMARXPTR, (u32)eth->m_curRX_FD);
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return 0;
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}
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/*
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* Public u-boot interface functions below
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*/
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int eth_init(bd_t *bis)
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{
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ETH *eth = &m_eth;
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/* store our MAC address */
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eth->m_mac = bis->bi_enetaddr;
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/* setup DBMA and MAC */
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PUT_REG( REG_BDMARXCON, ETH_BRxRS); /* reset BDMA RX machine */
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PUT_REG( REG_BDMATXCON, ETH_BTxRS); /* reset BDMA TX machine */
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PUT_REG( REG_MACCON , ETH_SwReset); /* reset MAC machine */
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PUT_REG( REG_BDMARXLSZ, sizeof(MACFrame));
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PUT_REG( REG_MACCON , 0); /* reset MAC machine */
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/* init frame descriptors */
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TxFDinit( eth);
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RxFDinit( eth);
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/* init the CAM with our MAC address */
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PUT_REG( REG_CAM_BASE, (eth->m_mac[0] << 24) |
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(eth->m_mac[1] << 16) |
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(eth->m_mac[2] << 8) |
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(eth->m_mac[3]));
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PUT_REG( REG_CAM_BASE + 0x4, (eth->m_mac[4] << 24) |
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(eth->m_mac[5] << 16));
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/* enable CAM address 1 -- the MAC we just loaded */
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PUT_REG( REG_CAMEN, 0x1);
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PUT_REG( REG_CAMCON,
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ETH_BroadAcc | /* accept broadcast packetes */
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ETH_CompEn); /* enable compare mode (check against the CAM) */
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/* configure the BDMA Transmitter control */
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PUT_REG( REG_BDMATXCON,
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ETH_BTxBRST | /* BDMA Tx burst size 16 words */
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ETH_BTxMSL110 | /* BDMA Tx wait to fill 6/8 of the BDMA */
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ETH_BTxSTSKO | /* BDMA Tx interrupt(Stop) on non-owner TX FD */
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ETH_BTxEn); /* BDMA Tx Enable */
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/* configure the MAC Transmitter control */
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PUT_REG( REG_MACTXCON,
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ETH_EnComp | /* interrupt when the MAC transmits or discards packet */
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ETH_TxEn); /* MAC transmit enable */
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/* configure the BDMA Receiver control */
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PUT_REG( REG_BDMARXCON,
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ETH_BRxBRST | /* BDMA Rx Burst Size 16 words */
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ETH_BRxSTSKO | /* BDMA Rx interrupt(Stop) on non-owner RX FD */
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ETH_BRxMAINC | /* BDMA Rx Memory Address increment */
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ETH_BRxDIE | /* BDMA Rx Every Received Frame Interrupt Enable */
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ETH_BRxNLIE | /* BDMA Rx NULL List Interrupt Enable */
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ETH_BRxNOIE | /* BDMA Rx Not Owner Interrupt Enable */
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ETH_BRxLittle | /* BDMA Rx Little endian */
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ETH_BRxEn); /* BDMA Rx Enable */
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/* configure the MAC Receiver control */
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PUT_REG( REG_MACRXCON,
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ETH_RxEn); /* MAC ETH_RxEn */
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return 0;
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}
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/* Send a packet */
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s32 eth_send(volatile void *packet, s32 length)
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{
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u32 i;
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ETH *eth = &m_eth;
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if ( eth->m_curTX_FD->m_frameDataPtr.bf.owner) {
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printf("eth_send(): TX Frame. CPU not owner.\n");
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return -1;
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}
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/* copy user data into frame data pointer */
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memcpy((void *)eth->m_curTX_FD->m_frameDataPtr.bf.dataPtr,
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(void *)packet,
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length);
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/* Set TX Frame flags */
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eth->m_curTX_FD->m_opt.bf.widgetAlign = 0;
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eth->m_curTX_FD->m_opt.bf.frameDataDir = 1;
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eth->m_curTX_FD->m_opt.bf.littleEndian = 1;
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eth->m_curTX_FD->m_opt.bf.macTxIrqEnbl = 1;
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eth->m_curTX_FD->m_opt.bf.no_crc = 0;
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eth->m_curTX_FD->m_opt.bf.no_padding = 0;
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/* Set TX Frame length */
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eth->m_curTX_FD->m_status.bf.len = length;
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/* Change ownership to BDMA */
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eth->m_curTX_FD->m_frameDataPtr.bf.owner = 1;
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/* Enable MAC and BDMA Tx control register */
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SET_REG( REG_BDMATXCON, ETH_BTxEn);
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SET_REG( REG_MACTXCON, ETH_TxEn);
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/* poll on TX completion status */
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while ( !eth->m_curTX_FD->m_status.bf.complete) {
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/* sleep */
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for ( i = 0; i < 0x10000; i ++);
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}
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/* Change the Tx frame descriptor for next use */
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eth->m_curTX_FD = eth->m_curTX_FD->m_nextFD;
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return 0;
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}
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/* Check for received packets */
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s32 eth_rx (void)
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{
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s32 nLen = 0;
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ETH *eth = &m_eth;
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/* check if packet ready */
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if ( (GET_REG( REG_BDMASTAT)) & ETH_S_BRxRDF) {
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/* process all waiting packets */
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while ( !eth->m_curRX_FD->m_frameDataPtr.bf.owner) {
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nLen = eth->m_curRX_FD->m_status.bf.len;
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/* call back u-boot -- may call eth_send() */
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NetReceive ((u8 *)eth->m_curRX_FD->m_frameDataPtr.ui, nLen);
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/* set owner back to CPU */
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eth->m_curRX_FD->m_frameDataPtr.bf.owner = 1;
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/* clear status */
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eth->m_curRX_FD->m_status.ui = 0x0;
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/* advance to next descriptor */
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eth->m_curRX_FD = eth->m_curRX_FD->m_nextFD;
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/* clear received frame bit */
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PUT_REG( REG_BDMASTAT, ETH_S_BRxRDF);
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}
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}
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return nLen;
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}
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/* Halt ethernet engine */
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void eth_halt(void)
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{
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/* disable MAC */
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PUT_REG( REG_MACCON, ETH_HaltReg);
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}
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#endif
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