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/*
* Cirrus Logic CS8900A Ethernet
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* Copyright (C) 1999 Ben Williamson <benw@pobox.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is loaded into SRAM in bootstrap mode, where it waits
* for commands on UART1 to read and write memory, jump to code etc.
* A design goal for this program is to be entirely independent of the
* target board. Anything with a CL-PS7111 or EP7211 should be able to run
* this code in bootstrap mode. All the board specifics can be handled on
* the host.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <common.h>
#include <command.h>
#include "cs8900.h"
#include <net.h>
#ifdef CONFIG_DRIVER_CS8900
#if (CONFIG_COMMANDS & CFG_CMD_NET)
/* packet page register access functions */
#ifdef CS8900_BUS32
/* we don't need 16 bit initialisation on 32 bit bus */
#define get_reg_init_bus(x) get_reg((x))
#else
static unsigned short get_reg_init_bus(int regno)
{
/* force 16 bit busmode */
volatile unsigned char c;
c = CS8900_BUS16_0;
c = CS8900_BUS16_1;
c = CS8900_BUS16_0;
c = CS8900_BUS16_1;
c = CS8900_BUS16_0;
CS8900_PPTR = regno;
return (unsigned short) CS8900_PDATA;
}
#endif
static unsigned short
get_reg(int regno)
{
CS8900_PPTR = regno;
return (unsigned short) CS8900_PDATA;
}
static void put_reg(int regno, unsigned short val)
{
CS8900_PPTR = regno;
CS8900_PDATA = val;
}
static void eth_reset(void)
{
int tmo;
unsigned short us;
/* reset NIC */
put_reg(PP_SelfCTL, get_reg(PP_SelfCTL) | PP_SelfCTL_Reset );
/* wait for 200ms */
udelay(200000);
/* Wait until the chip is reset */
tmo = get_timer(0) + 1 * CFG_HZ;
while ((((us = get_reg_init_bus(PP_SelfSTAT)) & PP_SelfSTAT_InitD) == 0)
&& tmo < get_timer(0))
/*NOP*/;
}
void cs8900_get_enetaddr (uchar *addr)
{
int i;
/* verify chip id */
if (get_reg_init_bus(PP_ChipID) != 0x630e)
return;
eth_reset();
if ((get_reg(PP_SelfST) & (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK)) ==
(PP_SelfSTAT_EEPROM|PP_SelfSTAT_EEPROM_OK)) {
/* Load the MAC from EEPROM */
for (i=0; i<6/2; i++) {
unsigned int Addr;
Addr = get_reg(PP_IA+i*2);
addr[i*2] = Addr & 0xFF;
addr[i*2+1] = Addr >> 8;
}
}
}
void eth_halt( void )
{
/* disable transmitter/receiver mode */
put_reg(PP_LineCTL, 0);
/* "shutdown" to show ChipID or kernel wouldn't find he cs8900 ... */
get_reg_init_bus(PP_ChipID);
}
int eth_init( bd_t *bd )
{
/* verify chip id */
if (get_reg_init_bus(PP_ChipID) != 0x630e)
{
printf( "CS8900 Ethernet chip not found?!\n" );
return 0;
}
eth_reset();
/* set the ethernet address */
put_reg(PP_IA + 0, bd->bi_enetaddr[0] | (bd->bi_enetaddr[1] << 8));
put_reg(PP_IA + 2, bd->bi_enetaddr[2] | (bd->bi_enetaddr[3] << 8));
put_reg(PP_IA + 4, bd->bi_enetaddr[4] | (bd->bi_enetaddr[5] << 8));
/* receive only error free packets addressed to this card */
put_reg(PP_RxCTL, PP_RxCTL_IA | PP_RxCTL_Broadcast | PP_RxCTL_RxOK);
/* do not generate any interrupts on receive operations */
put_reg(PP_RxCFG, 0);
/* do not generate any interrupts on transmit operations */
put_reg(PP_TxCFG, 0);
/* do not generate any interrupts on buffer operations */
put_reg(PP_BufCFG, 0);
/* enable transmitter/receiver mode */
put_reg(PP_LineCTL, PP_LineCTL_Rx | PP_LineCTL_Tx);
return 0;
}
/* Get a data block via Ethernet */
extern int eth_rx(void)
{
int i;
unsigned short rxlen;
unsigned short *addr;
unsigned short status;
status = get_reg(PP_RER);
if ((status & PP_RER_RxOK) == 0)
return 0;
status = CS8900_RTDATA; /* stat */
rxlen = CS8900_RTDATA; /* len */
if(rxlen > PKTSIZE_ALIGN + PKTALIGN)
printf("packet too big!\n");
for(addr = (unsigned short *)NetRxPackets[0], i = rxlen >> 1; i > 0; i-- )
*addr++ = CS8900_RTDATA;
if(rxlen & 1)
*addr++ = CS8900_RTDATA;
/* Pass the packet up to the protocol layers. */
NetReceive(NetRxPackets[0], rxlen);
return rxlen;
}
/* Send a data block via Ethernet. */
extern int eth_send(volatile void *packet, int length)
{
volatile unsigned short *addr;
int tmo;
unsigned short s;
retry:
/* initiate a transmit sequence */
CS8900_TxCMD = PP_TxCmd_TxStart_Full;
CS8900_TxLEN = length;
/* Test to see if the chip has allocated memory for the packet */
if ((get_reg(PP_BusSTAT) & PP_BusSTAT_TxRDY) == 0) {
/* Oops... this should not happen! */
printf("cs: unable to send packet; retrying...\n");
for (tmo = get_timer(0) + 5 * CFG_HZ; get_timer(0) < tmo; )
/*NOP*/;
eth_reset();
goto retry;
}
/* Write the contents of the packet */
/* assume even number of bytes */
for(addr = packet; length > 0; length -= 2 )
CS8900_RTDATA = *addr++;
/* wait for transfer to succeed */
tmo = get_timer(0) + 5 * CFG_HZ;
while((s = get_reg(PP_TER) & ~0x1F) == 0)
{
if (get_timer(0) >= tmo)
break;
}
/* nothing */ ;
if ((s & (PP_TER_CRS | PP_TER_TxOK)) != PP_TER_TxOK) {
printf("\ntransmission error %#x\n", s);
}
return 0;
}
#endif /* COMMANDS & CFG_NET */
#endif /* CONFIG_DRIVER_CS8900 */
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