diff options
Diffstat (limited to 'drivers/cs8900.c')
| -rw-r--r-- | drivers/cs8900.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/drivers/cs8900.c b/drivers/cs8900.c new file mode 100644 index 0000000..ecc7c13 --- /dev/null +++ b/drivers/cs8900.c @@ -0,0 +1,235 @@ +/* + * 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 */ |