/* * de620.c $Revision: 1.31 $ BETA * * * Linux driver for the D-Link DE-620 Ethernet pocket adapter. * * Portions (C) Copyright 1993, 1994 by Bjorn Ekwall * * Based on adapter information gathered from DOS packetdriver * sources from D-Link Inc: (Special thanks to Henry Ngai of D-Link.) * Portions (C) Copyright D-Link SYSTEM Inc. 1991, 1992 * Copyright, 1988, Russell Nelson, Crynwr Software * * Adapted to the sample network driver core for linux, * written by: Donald Becker * (Now at * * Valuable assistance from: * J. Joshua Kopper * Olav Kvittem * Germano Caronni * Jeremy Fitzhardinge * *****************************************************************************/ /* * 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, 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. * *****************************************************************************/ static char *version = "de620.c: $Revision: 1.31 $, Bjorn Ekwall \n"; /*********************************************************************** * * "Tuning" section. * * Compile-time options: (see below for descriptions) * -DDE620_IO=0x378 (lpt1) * -DDE620_IRQ=7 (lpt1) * -DDE602_DEBUG=... * -DSHUTDOWN_WHEN_LOST * -DCOUNT_LOOPS * -DLOWSPEED * -DREAD_DELAY * -DWRITE_DELAY */ /* * If the adapter has problems with high speeds, enable this #define * otherwise full printerport speed will be attempted. * * You can tune the READ_DELAY/WRITE_DELAY below if you enable LOWSPEED * #define LOWSPEED */ #ifndef READ_DELAY #define READ_DELAY 100 /* adapter internal read delay in 100ns units */ #endif #ifndef WRITE_DELAY #define WRITE_DELAY 100 /* adapter internal write delay in 100ns units */ #endif /* * Enable this #define if you want the adapter to do a "ifconfig down" on * itself when we have detected that something is possibly wrong with it. * The default behaviour is to retry with "adapter_init()" until success. * This should be used for debugging purposes only. * #define SHUTDOWN_WHEN_LOST */ /* * Enable debugging by "-DDE620_DEBUG=3" when compiling, * OR in "./CONFIG" * OR by enabling the following #define * * use 0 for production, 1 for verification, >2 for debug * #define DE620_DEBUG 3 */ #ifdef LOWSPEED /* * Enable this #define if you want to see debugging output that show how long * we have to wait before the DE-620 is ready for the next read/write/command. * #define COUNT_LOOPS */ #endif static int bnc, utp; /* * Force media with insmod: * insmod de620.o bnc=1 * or * insmod de620.o utp=1 */ #ifdef MODULE #include #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Constant definitions for the DE-620 registers, commands and bits */ #include "de620.h" #define netstats enet_statistics typedef unsigned char byte; /******************************************************* * * * Definition of D-Link DE-620 Ethernet Pocket adapter * * See also "de620.h" * * * *******************************************************/ #ifndef DE620_IO /* Compile-time configurable */ #define DE620_IO 0x378 #endif #ifndef DE620_IRQ /* Compile-time configurable */ #define DE620_IRQ 7 #endif #define DATA_PORT (DE620_IO) #define STATUS_PORT (DE620_IO + 1) #define COMMAND_PORT (DE620_IO + 2) #define RUNT 60 /* Too small Ethernet packet */ #define GIANT 1514 /* largest legal size packet, no fcs */ #ifdef DE620_DEBUG /* Compile-time configurable */ #define PRINTK(x) if (de620_debug >= 2) printk x #else #define DE620_DEBUG 0 #define PRINTK(x) /**/ #endif /*********************************************** * * * Index to functions, as function prototypes. * * * ***********************************************/ /* * Routines used internally. (See also "convenience macros.. below") */ /* Put in the device structure. */ static int de620_open(struct device *); static int de620_close(struct device *); static struct netstats *get_stats(struct device *); static void de620_set_multicast_list(struct device *, int, void *); static int de620_start_xmit(struct sk_buff *, struct device *); /* Dispatch from interrupts. */ static void de620_interrupt(int, struct pt_regs *); static int de620_rx_intr(struct device *); /* Initialization */ static int adapter_init(struct device *); int de620_probe(struct device *); static int read_eeprom(void); /* * D-Link driver variables: */ #define SCR_DEF NIBBLEMODE |INTON | SLEEP | AUTOTX #define TCR_DEF RXPB /* not used: | TXSUCINT | T16INT */ #define DE620_RX_START_PAGE 12 /* 12 pages (=3k) reserved for tx */ #define DEF_NIC_CMD IRQEN | ICEN | DS1 unsigned int de620_debug = DE620_DEBUG; static volatile byte NIC_Cmd; static volatile byte next_rx_page; static byte first_rx_page; static byte last_rx_page; static byte EIPRegister; static struct nic { byte NodeID[6]; byte RAM_Size; byte Model; byte Media; byte SCR; } nic_data; /********************************************************** * * * Convenience macros/functions for D-Link DE-620 adapter * * * **********************************************************/ #define de620_tx_buffs() (inb(STATUS_PORT) & (TXBF0 | TXBF1)) #define de620_flip_ds() NIC_Cmd ^= DS0 | DS1; outb(NIC_Cmd, COMMAND_PORT); /* Check for ready-status, and return a nibble (high 4 bits) for data input */ #ifdef COUNT_LOOPS static int tot_cnt; #endif static inline byte de620_ready(void) { byte value; register short int cnt = 0; while ((((value = inb(STATUS_PORT)) & READY) == 0) && (cnt <= 1000)) ++cnt; #ifdef COUNT_LOOPS tot_cnt += cnt; #endif return value & 0xf0; /* nibble */ } static inline void de620_send_command(byte cmd) { de620_ready(); if (cmd == W_DUMMY) outb(NIC_Cmd, COMMAND_PORT); outb(cmd, DATA_PORT); outb(NIC_Cmd ^ CS0, COMMAND_PORT); de620_ready(); outb(NIC_Cmd, COMMAND_PORT); } static inline void de620_put_byte(byte value) { /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */ de620_ready(); outb(value, DATA_PORT); de620_flip_ds(); } static inline byte de620_read_byte(void) { byte value; /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */ value = de620_ready(); /* High nibble */ de620_flip_ds(); value |= de620_ready() >> 4; /* Low nibble */ return value; } static inline void de620_write_block(byte *buffer, int count) { #ifndef LOWSPEED byte uflip = NIC_Cmd ^ (DS0 | DS1); byte dflip = NIC_Cmd; #else /* LOWSPEED */ #ifdef COUNT_LOOPS int bytes = count; #endif /* COUNT_LOOPS */ #endif /* LOWSPEED */ #ifdef LOWSPEED #ifdef COUNT_LOOPS tot_cnt = 0; #endif /* COUNT_LOOPS */ /* No further optimization useful, the limit is in the adapter. */ for ( ; count > 0; --count, ++buffer) { de620_put_byte(*buffer); } de620_send_command(W_DUMMY); #ifdef COUNT_LOOPS /* trial debug output: loops per byte in de620_ready() */ printk("WRITE(%d)\n", tot_cnt/((bytes?bytes:1))); #endif /* COUNT_LOOPS */ #else /* not LOWSPEED */ for ( ; count > 0; count -=2) { outb(*buffer++, DATA_PORT); outb(uflip, COMMAND_PORT); outb(*buffer++, DATA_PORT); outb(dflip, COMMAND_PORT); } de620_send_command(W_DUMMY); #endif /* LOWSPEED */ } static inline void de620_read_block(byte *data, int count) { #ifndef LOWSPEED byte value; byte uflip = NIC_Cmd ^ (DS0 | DS1); byte dflip = NIC_Cmd; #else /* LOWSPEED */ #ifdef COUNT_LOOPS int bytes = count; tot_cnt = 0; #endif /* COUNT_LOOPS */ #endif /* LOWSPEED */ #ifdef LOWSPEED /* No further optimization useful, the limit is in the adapter. */ while (count-- > 0) { *data++ = de620_read_byte(); de620_flip_ds(); } #ifdef COUNT_LOOPS /* trial debug output: loops per byte in de620_ready() */ printk("READ(%d)\n", tot_cnt/(2*(bytes?bytes:1))); #endif /* COUNT_LOOPS */ #else /* not LOWSPEED */ while (count-- > 0) { value = inb(STATUS_PORT) & 0xf0; /* High nibble */ outb(uflip, COMMAND_PORT); *data++ = value | inb(STATUS_PORT) >> 4; /* Low nibble */ outb(dflip , COMMAND_PORT); } #endif /* LOWSPEED */ } static inline void de620_set_delay(void) { de620_ready(); outb(W_DFR, DATA_PORT); outb(NIC_Cmd ^ CS0, COMMAND_PORT); de620_ready(); #ifdef LOWSPEED outb(WRITE_DELAY, DATA_PORT); #else outb(0, DATA_PORT); #endif de620_flip_ds(); de620_ready(); #ifdef LOWSPEED outb(READ_DELAY, DATA_PORT); #else outb(0, DATA_PORT); #endif de620_flip_ds(); } static inline void de620_set_register(byte reg, byte value) { de620_ready(); outb(reg, DATA_PORT); outb(NIC_Cmd ^ CS0, COMMAND_PORT); de620_put_byte(value); } static inline byte de620_get_register(byte reg) { byte value; de620_send_command(reg); value = de620_read_byte(); de620_send_command(W_DUMMY); return value; } /********************************************************************* * * Open/initialize the board. * * This routine should set everything up anew at each open, even * registers that "should" only need to be set once at boot, so that * there is a non-reboot way to recover if something goes wrong. * */ static int de620_open(struct device *dev) { if (request_irq(DE620_IRQ, de620_interrupt, 0, "de620")) { printk ("%s: unable to get IRQ %d\n", dev->name, DE620_IRQ); return 1; } irq2dev_map[DE620_IRQ] = dev; #ifdef MODULE MOD_INC_USE_COUNT; #endif if (adapter_init(dev)) { return 1; } dev->start = 1; return 0; } /************************************************ * * The inverse routine to de620_open(). * */ static int de620_close(struct device *dev) { /* disable recv */ de620_set_register(W_TCR, RXOFF); free_irq(DE620_IRQ); irq2dev_map[DE620_IRQ] = NULL; dev->start = 0; #ifdef MODULE MOD_DEC_USE_COUNT; #endif return 0; } /********************************************* * * Return current statistics * */ static struct netstats * get_stats(struct device *dev) { return (struct netstats *)(dev->priv); } /********************************************* * * Set or clear the multicast filter for this adaptor. * (no real multicast implemented for the DE-620, but she can be promiscuous...) * * num_addrs == -1 Promiscuous mode, receive all packets * num_addrs == 0 Normal mode, clear multicast list * num_addrs > 0 Multicast mode, receive normal and MC packets, and do * best-effort filtering. */ static void de620_set_multicast_list(struct device *dev, int num_addrs, void *addrs) { if (num_addrs) { /* Enable promiscuous mode */ de620_set_register(W_TCR, (TCR_DEF & ~RXPBM) | RXALL); } else { /* Disable promiscuous mode, use normal mode */ de620_set_register(W_TCR, TCR_DEF); } } /******************************************************* * * Copy a buffer to the adapter transmit page memory. * Start sending. */ static int de620_start_xmit(struct sk_buff *skb, struct device *dev) { unsigned long flags; int len; int tickssofar; byte *buffer = skb->data; byte using_txbuf; /* * If some higher layer thinks we've missed a * tx-done interrupt we are passed NULL. * Caution: dev_tint() handles the cli()/sti() itself. */ if (skb == NULL) { dev_tint(dev); return 0; } using_txbuf = de620_tx_buffs(); /* Peek at the adapter */ dev->tbusy = (using_txbuf == (TXBF0 | TXBF1)); /* Boolean! */ if (dev->tbusy) { /* Do timeouts, to avoid hangs. */ tickssofar = jiffies - dev->trans_start; if (tickssofar < 5) return 1; /* else */ printk("%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem" ); /* Restart the adapter. */ if (adapter_init(dev)) /* maybe close it */ return 1; } if ((len = skb->len) < RUNT) len = RUNT; if (len & 1) /* send an even number of bytes */ ++len; /* Start real output */ save_flags(flags); cli(); PRINTK(("de620_start_xmit: len=%d, bufs 0x%02x\n", (int)skb->len, using_txbuf)); /* select a free tx buffer. if there is one... */ switch (using_txbuf) { default: /* both are free: use TXBF0 */ case TXBF1: /* use TXBF0 */ de620_send_command(W_CR | RW0); using_txbuf |= TXBF0; break; case TXBF0: /* use TXBF1 */ de620_send_command(W_CR | RW1); using_txbuf |= TXBF1; break; case (TXBF0 | TXBF1): /* NONE!!! */ printk("de620: Ouch! No tx-buffer available!\n"); restore_flags(flags); return 1; break; } de620_write_block(buffer, len); dev->trans_start = jiffies; dev->tbusy = (using_txbuf == (TXBF0 | TXBF1)); /* Boolean! */ ((struct netstats *)(dev->priv))->tx_packets++; restore_flags(flags); /* interrupts maybe back on */ dev_kfree_skb (skb, FREE_WRITE); return 0; } /***************************************************** * * Handle the network interface interrupts. * */ static void de620_interrupt(int irq, struct pt_regs *regs) { struct device *dev = irq2dev_map[irq]; byte irq_status; int bogus_count = 0; int again = 0; /* This might be deleted now, no crummy drivers present :-) Or..? */ if ((dev == NULL) || (DE620_IRQ != irq)) { printk("%s: bogus interrupt %d\n", dev?dev->name:"DE620", irq); return; } cli(); dev->interrupt = 1; /* Read the status register (_not_ the status port) */ irq_status = de620_get_register(R_STS); PRINTK(("de620_interrupt (%2.2X)\n", irq_status)); if (irq_status & RXGOOD) { do { again = de620_rx_intr(dev); PRINTK(("again=%d\n", again)); } while (again && (++bogus_count < 100)); } dev->tbusy = (de620_tx_buffs() == (TXBF0 | TXBF1)); /* Boolean! */ dev->interrupt = 0; sti(); return; } /************************************** * * Get a packet from the adapter * * Send it "upstairs" * */ static int de620_rx_intr(struct device *dev) { struct header_buf { byte status; byte Rx_NextPage; unsigned short Rx_ByteCount; } header_buf; struct sk_buff *skb; int size; byte *buffer; byte pagelink; byte curr_page; PRINTK(("de620_rx_intr: next_rx_page = %d\n", next_rx_page)); /* Tell the adapter that we are going to read data, and from where */ de620_send_command(W_CR | RRN); de620_set_register(W_RSA1, next_rx_page); de620_set_register(W_RSA0, 0); /* Deep breath, and away we goooooo */ de620_read_block((byte *)&header_buf, sizeof(struct header_buf)); PRINTK(("page status=0x%02x, nextpage=%d, packetsize=%d\n", header_buf.status, header_buf.Rx_NextPage, header_buf.Rx_ByteCount)); /* Plausible page header? */ pagelink = header_buf.Rx_NextPage; if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) { /* Ouch... Forget it! Skip all and start afresh... */ printk("%s: Ring overrun? Restoring...\n", dev->name); /* You win some, you loose some. And sometimes plenty... */ adapter_init(dev); ((struct netstats *)(dev->priv))->rx_over_errors++; return 0; } /* OK, this look good, so far. Let's see if it's consistent... */ /* Let's compute the start of the next packet, based on where we are */ pagelink = next_rx_page + ((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8); /* Are we going to wrap around the page counter? */ if (pagelink > last_rx_page) pagelink -= (last_rx_page - first_rx_page + 1); /* Is the _computed_ next page number equal to what the adapter says? */ if (pagelink != header_buf.Rx_NextPage) { /* Naah, we'll skip this packet. Probably bogus data as well */ printk("%s: Page link out of sync! Restoring...\n", dev->name); next_rx_page = header_buf.Rx_NextPage; /* at least a try... */ de620_send_command(W_DUMMY); de620_set_register(W_NPRF, next_rx_page); ((struct netstats *)(dev->priv))->rx_over_errors++; return 0; } next_rx_page = pagelink; size = header_buf.Rx_ByteCount - 4; if ((size < RUNT) || (GIANT < size)) { printk("%s: Illegal packet size: %d!\n", dev->name, size); } else { /* Good packet? */ skb = alloc_skb(size, GFP_ATOMIC); if (skb == NULL) { /* Yeah, but no place to put it... */ printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size); ((struct netstats *)(dev->priv))->rx_dropped++; } else { /* Yep! Go get it! */ skb->len = size; skb->dev = dev; skb->free = 1; /* skb->data points to the start of sk_buff data area */ buffer = skb->data; /* copy the packet into the buffer */ de620_read_block(buffer, size); PRINTK(("Read %d bytes\n", size)); netif_rx(skb); /* deliver it "upstairs" */ /* count all receives */ ((struct netstats *)(dev->priv))->rx_packets++; } } /* Let's peek ahead to see if we have read the last current packet */ /* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */ curr_page = de620_get_register(R_CPR); de620_set_register(W_NPRF, next_rx_page); PRINTK(("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page)); return (next_rx_page != curr_page); /* That was slightly tricky... */ } /********************************************* * * Reset the adapter to a known state * */ static int adapter_init(struct device *dev) { int i; static int was_down = 0; if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */ EIPRegister = NCTL0; if (nic_data.Media != 1) EIPRegister |= NIS0; /* not BNC */ } else if (nic_data.Model == 2) { /* UTP */ EIPRegister = NCTL0 | NIS0; } if (utp) EIPRegister = NCTL0 | NIS0; if (bnc) EIPRegister = NCTL0; de620_send_command(W_CR | RNOP | CLEAR); de620_send_command(W_CR | RNOP); de620_set_register(W_SCR, SCR_DEF); /* disable recv to wait init */ de620_set_register(W_TCR, RXOFF); /* Set the node ID in the adapter */ for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */ de620_set_register(W_PAR0 + i, dev->dev_addr[i]); } de620_set_register(W_EIP, EIPRegister); next_rx_page = first_rx_page = DE620_RX_START_PAGE; if (nic_data.RAM_Size) last_rx_page = nic_data.RAM_Size - 1; else /* 64k RAM */ last_rx_page = 255; de620_set_register(W_SPR, first_rx_page); /* Start Page Register */ de620_set_register(W_EPR, last_rx_page); /* End Page Register */ de620_set_register(W_CPR, first_rx_page); /* Current Page Register */ de620_send_command(W_NPR | first_rx_page); /* Next Page Register */ de620_send_command(W_DUMMY); de620_set_delay(); /* Final sanity check: Anybody out there? */ /* Let's hope some bits from the statusregister make a good check */ #define CHECK_MASK ( 0 | TXSUC | T16 | 0 | RXCRC | RXSHORT | 0 | 0 ) #define CHECK_OK ( 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 ) /* success: X 0 0 X 0 0 X X */ /* ignore: EEDI RXGOOD COLS LNKS*/ if (((i = de620_get_register(R_STS)) & CHECK_MASK) != CHECK_OK) { printk("Something has happened to the DE-620! Please check it" #ifdef SHUTDOWN_WHEN_LOST " and do a new ifconfig" #endif "! (%02x)\n", i); #ifdef SHUTDOWN_WHEN_LOST /* Goodbye, cruel world... */ dev->flags &= ~IFF_UP; de620_close(dev); #endif was_down = 1; return 1; /* failed */ } if (was_down) { printk("Thanks, I feel much better now!\n"); was_down = 0; } /* All OK, go ahead... */ de620_set_register(W_TCR, TCR_DEF); return 0; /* all ok */ } /****************************************************************************** * * Only start-up code below * */ /**************************************** * * Check if there is a DE-620 connected */ int de620_probe(struct device *dev) { static struct netstats de620_netstats; int i; byte checkbyte = 0xa5; if (de620_debug) printk(version); printk("D-Link DE-620 pocket adapter"); /* Initially, configure basic nibble mode, so we can read the EEPROM */ NIC_Cmd = DEF_NIC_CMD; de620_set_register(W_EIP, EIPRegister); /* Anybody out there? */ de620_set_register(W_CPR, checkbyte); checkbyte = de620_get_register(R_CPR); if ((checkbyte != 0xa5) || (read_eeprom() != 0)) { printk(" not identified in the printer port\n"); return ENODEV; } #if 0 /* Not yet */ if (check_region(DE620_IO, 3)) { printk(", port 0x%x busy\n", DE620_IO); return EBUSY; } #endif request_region(DE620_IO, 3, "de620"); /* else, got it! */ printk(", Ethernet Address: %2.2X", dev->dev_addr[0] = nic_data.NodeID[0]); for (i = 1; i < ETH_ALEN; i++) { printk(":%2.2X", dev->dev_addr[i] = nic_data.NodeID[i]); dev->broadcast[i] = 0xff; } printk(" (%dk RAM,", (nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64); if (nic_data.Media == 1) printk(" BNC)\n"); else printk(" UTP)\n"); /* Initialize the device structure. */ /*dev->priv = kmalloc(sizeof(struct netstats), GFP_KERNEL);*/ dev->priv = &de620_netstats; memset(dev->priv, 0, sizeof(struct netstats)); dev->get_stats = get_stats; dev->open = de620_open; dev->stop = de620_close; dev->hard_start_xmit = &de620_start_xmit; dev->set_multicast_list = &de620_set_multicast_list; dev->base_addr = DE620_IO; dev->irq = DE620_IRQ; ether_setup(dev); /* dump eeprom */ if (de620_debug) { printk("\nEEPROM contents:\n"); printk("RAM_Size = 0x%02X\n", nic_data.RAM_Size); printk("NodeID = %02X:%02X:%02X:%02X:%02X:%02X\n", nic_data.NodeID[0], nic_data.NodeID[1], nic_data.NodeID[2], nic_data.NodeID[3], nic_data.NodeID[4], nic_data.NodeID[5]); printk("Model = %d\n", nic_data.Model); printk("Media = %d\n", nic_data.Media); printk("SCR = 0x%02x\n", nic_data.SCR); } return 0; } /********************************** * * Read info from on-board EEPROM * * Note: Bitwise serial I/O to/from the EEPROM vi the status _register_! */ #define sendit(data) de620_set_register(W_EIP, data | EIPRegister); static unsigned short ReadAWord(int from) { unsigned short data; int nbits; /* cs [__~~] SET SEND STATE */ /* di [____] */ /* sck [_~~_] */ sendit(0); sendit(1); sendit(5); sendit(4); /* Send the 9-bit address from where we want to read the 16-bit word */ for (nbits = 9; nbits > 0; --nbits, from <<= 1) { if (from & 0x0100) { /* bit set? */ /* cs [~~~~] SEND 1 */ /* di [~~~~] */ /* sck [_~~_] */ sendit(6); sendit(7); sendit(7); sendit(6); } else { /* cs [~~~~] SEND 0 */ /* di [____] */ /* sck [_~~_] */ sendit(4); sendit(5); sendit(5); sendit(4); } } /* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */ for (data = 0, nbits = 16; nbits > 0; --nbits) { /* cs [~~~~] SEND 0 */ /* di [____] */ /* sck [_~~_] */ sendit(4); sendit(5); sendit(5); sendit(4); data = (data << 1) | ((de620_get_register(R_STS) & EEDI) >> 7); } /* cs [____] RESET SEND STATE */ /* di [____] */ /* sck [_~~_] */ sendit(0); sendit(1); sendit(1); sendit(0); return data; } static int read_eeprom(void) { unsigned short wrd; /* D-Link Ethernet addresses are in the series 00:80:c8:7X:XX:XX:XX */ wrd = ReadAWord(0x1aa); /* bytes 0 + 1 of NodeID */ if (wrd != htons(0x0080)) /* Valid D-Link ether sequence? */ return -1; /* Nope, not a DE-620 */ nic_data.NodeID[0] = wrd & 0xff; nic_data.NodeID[1] = wrd >> 8; wrd = ReadAWord(0x1ab); /* bytes 2 + 3 of NodeID */ if ((wrd & 0xff) != 0xc8) /* Valid D-Link ether sequence? */ return -1; /* Nope, not a DE-620 */ nic_data.NodeID[2] = wrd & 0xff; nic_data.NodeID[3] = wrd >> 8; wrd = ReadAWord(0x1ac); /* bytes 4 + 5 of NodeID */ nic_data.NodeID[4] = wrd & 0xff; nic_data.NodeID[5] = wrd >> 8; wrd = ReadAWord(0x1ad); /* RAM size in pages (256 bytes). 0 = 64k */ nic_data.RAM_Size = (wrd >> 8); wrd = ReadAWord(0x1ae); /* hardware model (CT = 3) */ nic_data.Model = (wrd & 0xff); wrd = ReadAWord(0x1af); /* media (indicates BNC/UTP) */ nic_data.Media = (wrd & 0xff); wrd = ReadAWord(0x1a8); /* System Configuration Register */ nic_data.SCR = (wrd >> 8); return 0; /* no errors */ } /****************************************************************************** * * Loadable module skeleton * */ #ifdef MODULE char kernel_version[] = UTS_RELEASE; static char nullname[8]; static struct device de620_dev = { nullname, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, de620_probe }; int init_module(void) { if (register_netdev(&de620_dev) != 0) return -EIO; return 0; } void cleanup_module(void) { unregister_netdev(&de620_dev); release_region(DE620_IO, 3); } #endif /* MODULE */ /* * (add '-DMODULE' when compiling as loadable module) * * compile-command: * gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 \ * -fomit-frame-pointer -m486 \ * -I/usr/src/linux/include -I../../net/inet -c de620.c */