diff options
Diffstat (limited to 'drivers/net/cs8900.c')
| -rw-r--r-- | drivers/net/cs8900.c | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/drivers/net/cs8900.c b/drivers/net/cs8900.c new file mode 100644 index 0000000..80c4ba2 --- /dev/null +++ b/drivers/net/cs8900.c @@ -0,0 +1,322 @@ +/* + * Cirrus Logic CS8900A Ethernet + * + * (C) 2003 Wolfgang Denk, wd@denx.de + * Extension to synchronize ethaddr environment variable + * against value in EEPROM + * + * (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 defined(CONFIG_CMD_NET) + +#undef DEBUG + +/* 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*/; +} + +static void eth_reginit (void) +{ + /* 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); +} + +void cs8900_get_enetaddr (uchar * addr) +{ + int i; + unsigned char env_enetaddr[6]; + char *tmp = getenv ("ethaddr"); + char *end; + + for (i=0; i<6; i++) { + env_enetaddr[i] = tmp ? simple_strtoul(tmp, &end, 16) : 0; + if (tmp) + tmp = (*end) ? end+1 : end; + } + + /* 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; + } + + if (memcmp(env_enetaddr, "\0\0\0\0\0\0", 6) != 0 && + memcmp(env_enetaddr, addr, 6) != 0) { + printf ("\nWarning: MAC addresses don't match:\n"); + printf ("\tHW MAC address: " + "%02X:%02X:%02X:%02X:%02X:%02X\n", + addr[0], addr[1], + addr[2], addr[3], + addr[4], addr[5] ); + printf ("\t\"ethaddr\" value: " + "%02X:%02X:%02X:%02X:%02X:%02X\n", + env_enetaddr[0], env_enetaddr[1], + env_enetaddr[2], env_enetaddr[3], + env_enetaddr[4], env_enetaddr[5]) ; + debug ("### Set MAC addr from environment\n"); + memcpy (addr, env_enetaddr, 6); + } + if (!tmp) { + char ethaddr[20]; + sprintf (ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X", + addr[0], addr[1], + addr[2], addr[3], + addr[4], addr[5]) ; + debug ("### Set environment from HW MAC addr = \"%s\"\n", ethaddr); + setenv ("ethaddr", ethaddr); + } + + } +} + +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)); + + eth_reginit (); + 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 */ + +#ifdef DEBUG + if (rxlen > PKTSIZE_ALIGN + PKTALIGN) + printf ("packet too big!\n"); +#endif + 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! */ +#ifdef DEBUG + printf ("cs: unable to send packet; retrying...\n"); +#endif + for (tmo = get_timer (0) + 5 * CFG_HZ; get_timer (0) < tmo;) + /*NOP*/; + eth_reset (); + eth_reginit (); + 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) { +#ifdef DEBUG + printf ("\ntransmission error %#x\n", s); +#endif + } + + return 0; +} + +static void cs8900_e2prom_ready(void) +{ + while(get_reg(PP_SelfST) & SI_BUSY); +} + +/***********************************************************/ +/* read a 16-bit word out of the EEPROM */ +/***********************************************************/ + +int cs8900_e2prom_read(unsigned char addr, unsigned short *value) +{ + cs8900_e2prom_ready(); + put_reg(PP_EECMD, EEPROM_READ_CMD | addr); + cs8900_e2prom_ready(); + *value = get_reg(PP_EEData); + + return 0; +} + + +/***********************************************************/ +/* write a 16-bit word into the EEPROM */ +/***********************************************************/ + +int cs8900_e2prom_write(unsigned char addr, unsigned short value) +{ + cs8900_e2prom_ready(); + put_reg(PP_EECMD, EEPROM_WRITE_EN); + cs8900_e2prom_ready(); + put_reg(PP_EEData, value); + put_reg(PP_EECMD, EEPROM_WRITE_CMD | addr); + cs8900_e2prom_ready(); + put_reg(PP_EECMD, EEPROM_WRITE_DIS); + cs8900_e2prom_ready(); + + return 0; +} + +#endif /* COMMANDS & CFG_NET */ + +#endif /* CONFIG_DRIVER_CS8900 */ |