/*
* de620.c $Revision: 1.40 $ BETA
*
*
* Linux driver for the D-Link DE-620 Ethernet pocket adapter.
*
* Portions (C) Copyright 1993, 1994 by Bjorn Ekwall <bj0rn@blox.se>
*
* 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 <becker@super.org>
* (Now at <becker@scyld.com>)
*
* Valuable assistance from:
* J. Joshua Kopper <kopper@rtsg.mot.com>
* Olav Kvittem <Olav.Kvittem@uninett.no>
* Germano Caronni <caronni@nessie.cs.id.ethz.ch>
* Jeremy Fitzhardinge <jeremy@suite.sw.oz.au>
*
*****************************************************************************/
/*
* 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 const char version[] =
"de620.c: $Revision: 1.40 $, Bjorn Ekwall <bj0rn@blox.se>\n";
/***********************************************************************
*
* "Tuning" section.
*
* Compile-time options: (see below for descriptions)
* -DDE620_IO=0x378 (lpt1)
* -DDE620_IRQ=7 (lpt1)
* -DSHUTDOWN_WHEN_LOST
* -DCOUNT_LOOPS
* -DLOWSPEED
* -DREAD_DELAY
* -DWRITE_DELAY
*/
/*
* This driver assumes that the printer port is a "normal",
* dumb, uni-directional port!
* If your port is "fancy" in any way, please try to set it to "normal"
* with your BIOS setup. I have no access to machines with bi-directional
* ports, so I can't test such a driver :-(
* (Yes, I _know_ it is possible to use DE620 with bidirectional ports...)
*
* There are some clones of DE620 out there, with different names.
* If the current driver does not recognize a clone, try to change
* the following #define to:
*
* #define DE620_CLONE 1
*/
#define DE620_CLONE 0
/*
* 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
*/
#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
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <asm/io.h>
#include <asm/system.h>
/* Constant definitions for the DE-620 registers, commands and bits */
#include "de620.h"
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 (dev->base_addr)
#define STATUS_PORT (dev->base_addr + 1)
#define COMMAND_PORT (dev->base_addr + 2)
#define RUNT 60 /* Too small Ethernet packet */
#define GIANT 1514 /* largest legal size packet, no fcs */
/*
* Force media with insmod:
* insmod de620.o bnc=1
* or
* insmod de620.o utp=1
*
* Force io and/or irq with insmod:
* insmod de620.o io=0x378 irq=7
*
* Make a clone skip the Ethernet-address range check:
* insmod de620.o clone=1
*/
static int bnc;
static int utp;
static int io = DE620_IO;
static int irq = DE620_IRQ;
static int clone = DE620_CLONE;
static spinlock_t de620_lock;
module_param(bnc, int, 0);
module_param(utp, int, 0);
module_param(io, int, 0);
module_param(irq, int, 0);
module_param(clone, int, 0);
MODULE_PARM_DESC(bnc, "DE-620 set BNC medium (0-1)");
MODULE_PARM_DESC(utp, "DE-620 set UTP medium (0-1)");
MODULE_PARM_DESC(io, "DE-620 I/O base address,required");
MODULE_PARM_DESC(irq, "DE-620 IRQ number,required");
MODULE_PARM_DESC(clone, "Check also for non-D-Link DE-620 clones (0-1)");
/***********************************************
* *
* Index to functions, as function prototypes. *
* *
***********************************************/
/*
* Routines used internally. (See also "convenience macros.. below")
*/
/* Put in the device structure. */
static int de620_open(struct net_device *);
static int de620_close(struct net_device *);
static void de620_set_multicast_list(struct net_device *);
static int de620_start_xmit(struct sk_buff *, struct net_device *);
/* Dispatch from interrupts. */
static irqreturn_t de620_interrupt(int, void *);
static int de620_rx_intr(struct net_device *);
/* Initialization */
static int adapter_init(struct net_device *);
static int read_eeprom(struct net_device *);
/*
* 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
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(dd) (inb(STATUS_PORT) & (TXBF0 | TXBF1))
#define de620_flip_ds(dd) 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(struct net_device *dev)
{
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(struct net_device *dev, byte cmd)
{
de620_ready(dev);
if (cmd == W_DUMMY)
outb(NIC_Cmd, COMMAND_PORT);
outb(cmd, DATA_PORT);
outb(NIC_Cmd ^ CS0, COMMAND_PORT);
de620_ready(dev);
outb(NIC_Cmd, COMMAND_PORT);
}
static inline void
de620_put_byte(struct net_device *dev, byte value)
{
/* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
de620_ready(dev);
outb(value, DATA_PORT);
de620_flip_ds(dev);
}
static inline byte
de620_read_byte(struct net_device *dev)
{
byte value;
/* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
value = de620_ready(dev); /* High nibble */
de620_flip_ds(dev);
value |= de620_ready(dev) >> 4; /* Low nibble */
return value;
}
static inline void
de620_write_block(struct net_device *dev, byte *buffer, int count, int pad)
{
#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(dev,*buffer);
}
for ( count = pad ; count > 0; --count, ++buffer) {
de620_put_byte(dev, 0);
}
de620_send_command(dev,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(dev,W_DUMMY);
#endif /* LOWSPEED */
}
static inline void
de620_read_block(struct net_device *dev, 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(dev);
de620_flip_ds(dev);
}
#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(struct net_device *dev)
{
de620_ready(dev);
outb(W_DFR, DATA_PORT);
outb(NIC_Cmd ^ CS0, COMMAND_PORT);
de620_ready(dev);
#ifdef LOWSPEED
outb(WRITE_DELAY, DATA_PORT);
#else
outb(0, DATA_PORT);
#endif
de620_flip_ds(dev);
de620_ready(dev);
#ifdef LOWSPEED
outb(READ_DELAY, DATA_PORT);
#else
outb(0, DATA_PORT);
#endif
de620_flip_ds(dev);
}
static inline void
de620_set_register(struct net_device *dev, byte reg, byte value)
{
de620_ready(dev);
outb(reg, DATA_PORT);
outb(NIC_Cmd ^ CS0, COMMAND_PORT);
de620_put_byte(dev, value);
}
static inline byte
de620_get_register(struct net_device *dev, byte reg)
{
byte value;
de620_send_command(dev,reg);
value = de620_read_byte(dev);
de620_send_command(dev,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 net_device *dev)
{
int ret = request_irq(dev->irq, de620_interrupt, 0, dev->name, dev);
if (ret) {
printk (KERN_ERR "%s: unable to get IRQ %d\n", dev->name, dev->irq);
return ret;
}
if (adapter_init(dev)) {
ret = -EIO;
goto out_free_irq;
}
netif_start_queue(dev);
return 0;
out_free_irq:
free_irq(dev->irq, dev);
return ret;
}
/************************************************
*
* The inverse routine to de620_open().
*
*/
static int de620_close(struct net_device *dev)
{
netif_stop_queue(dev);
/* disable recv */
de620_set_register(dev, W_TCR, RXOFF);
free_irq(dev->irq, dev);
return 0;
}
/*********************************************
*
* Set or clear the multicast filter for this adaptor.
* (no real multicast implemented for the DE-620, but she can be promiscuous...)
*
*/
static void de620_set_multicast_list(struct net_device *dev)
{
if (!netdev_mc_empty(dev) || dev->flags&(IFF_ALLMULTI|IFF_PROMISC))
{ /* Enable promiscuous mode */
de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL);
}
else
{ /* Disable promiscuous mode, use normal mode */
de620_set_register(dev, W_TCR, TCR_DEF);
}
}
/*******************************************************
*
* Handle timeouts on transmit
*/
static void de620_timeout(struct net_device *dev)
{
printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, "network cable problem");
/* Restart the adapter. */
if (!adapter_init(dev)) /* maybe close it */
netif_wake_queue(dev);
}
/*******************************************************
*
* Copy a buffer to the adapter transmit page memory.
* Start sending.
*/
static int de620_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
unsigned long flags;
int len;
byte *buffer = skb->data;
byte using_txbuf;
using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */
netif_stop_queue(dev);
if ((len = skb->len) < RUNT)
len = RUNT;
if (len & 1) /* send an even number of bytes */
++len;
/* Start real output */
spin_lock_irqsave(&de620_lock, flags);
pr_debug("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(dev,W_CR | RW0);
using_txbuf |= TXBF0;
break;
case TXBF0: /* use TXBF1 */
de620_send_command(dev,W_CR | RW1);
using_txbuf |= TXBF1;
break;
case (TXBF0 | TXBF1): /* NONE!!! */
printk(KERN_WARNING "%s: No tx-buffer available!\n", dev->name);
spin_unlock_irqrestore(&de620_lock, flags);
return NETDEV_TX_BUSY;
}
de620_write_block(dev, buffer, skb->len, len-skb->len);
if(!(using_txbuf == (TXBF0 | TXBF1)))
netif_wake_queue(dev);
dev->stats.tx_packets++;
spin_unlock_irqrestore(&de620_lock, flags);
dev_kfree_skb (skb);
return NETDEV_TX_OK;
}
/*****************************************************
*
* Handle the network interface interrupts.
*
*/
static irqreturn_t
de620_interrupt(int irq_in, void *dev_id)
{
struct net_device *dev = dev_id;
byte irq_status;
int bogus_count = 0;
int again = 0;
spin_lock(&de620_lock);
/* Read the status register (_not_ the status port) */
irq_status = de620_get_register(dev, R_STS);
pr_debug("de620_interrupt (%2.2X)\n", irq_status);
if (irq_status & RXGOOD) {
do {
again = de620_rx_intr(dev);
pr_debug("again=%d\n", again);
}
while (again && (++bogus_count < 100));
}
if(de620_tx_buffs(dev) != (TXBF0 | TXBF1))
netif_wake_queue(dev);
spin_unlock(&de620_lock);
return IRQ_HANDLED;
}
/**************************************
*
* Get a packet from the adapter
*
* Send it "upstairs"
*
*/
static int de620_rx_intr(struct net_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;
pr_debug("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(dev, W_CR | RRN);
de620_set_register(dev, W_RSA1, next_rx_page);
de620_set_register(dev, W_RSA0, 0);
/* Deep breath, and away we goooooo */
de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf));
pr_debug("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(KERN_WARNING "%s: Ring overrun? Restoring...\n", dev->name);
/* You win some, you lose some. And sometimes plenty... */
adapter_init(dev);
netif_wake_queue(dev);
dev->stats.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(KERN_WARNING "%s: Page link out of sync! Restoring...\n", dev->name);
next_rx_page = header_buf.Rx_NextPage; /* at least a try... */
de620_send_command(dev, W_DUMMY);
de620_set_register(dev, W_NPRF, next_rx_page);
dev->stats.rx_over_errors++;
return 0;
}
next_rx_page = pagelink;
size = header_buf.Rx_ByteCount - 4;
if ((size < RUNT) || (GIANT < size)) {
printk(KERN_WARNING "%s: Illegal packet size: %d!\n", dev->name, size);
}
else { /* Good packet? */
skb = dev_alloc_skb(size+2);
if (skb == NULL) { /* Yeah, but no place to put it... */
printk(KERN_WARNING "%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
dev->stats.rx_dropped++;
}
else { /* Yep! Go get it! */
skb_reserve(skb,2); /* Align */
/* skb->data points to the start of sk_buff data area */
buffer = skb_put(skb,size);
/* copy the packet into the buffer */
de620_read_block(dev, buffer, size);
pr_debug("Read %d bytes\n", size);
skb->protocol=eth_type_trans(skb,dev);
netif_rx(skb); /* deliver it "upstairs" */
/* count all receives */
dev->stats.rx_packets++;
dev->stats.rx_bytes += size;
}
}
/* 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(dev, R_CPR);
de620_set_register(dev, W_NPRF, next_rx_page);
pr_debug("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 net_device *dev)
{
int i;
static int was_down;
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(dev, W_CR | RNOP | CLEAR);
de620_send_command(dev, W_CR | RNOP);
de620_set_register(dev, W_SCR, SCR_DEF);
/* disable recv to wait init */
de620_set_register(dev, W_TCR, RXOFF);
/* Set the node ID in the adapter */
for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */
de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]);
}
de620_set_register(dev, 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(dev, W_SPR, first_rx_page); /* Start Page Register*/
de620_set_register(dev, W_EPR, last_rx_page); /* End Page Register */
de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/
de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/
de620_send_command(dev, W_DUMMY);
de620_set_delay(dev);
/* 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(dev, R_STS)) & CHECK_MASK) != CHECK_OK) {
printk(KERN_ERR "%s: Something has happened to the DE-620! Please check it"
#ifdef SHUTDOWN_WHEN_LOST
" and do a new ifconfig"
#endif
"! (%02x)\n", dev->name, 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(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name);
was_down = 0;
}
/* All OK, go ahead... */
de620_set_register(dev, W_TCR, TCR_DEF);
return 0; /* all ok */
}
static const struct net_device_ops de620_netdev_ops = {
.ndo_open = de620_open,
.ndo_stop = de620_close,
.ndo_start_xmit = de620_start_xmit,
.ndo_tx_timeout = de620_timeout,
.ndo_set_multicast_list = de620_set_multicast_list,
.ndo_change_mtu = eth_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
};
/******************************************************************************
*
* Only start-up code below
*
*/
/****************************************
*
* Check if there is a DE-620 connected
*/
struct net_device * __init de620_probe(int unit)
{
byte checkbyte = 0xa5;
struct net_device *dev;
int err = -ENOMEM;
int i;
dev = alloc_etherdev(0);
if (!dev)
goto out;
spin_lock_init(&de620_lock);
/*
* This is where the base_addr and irq gets set.
* Tunable at compile-time and insmod-time
*/
dev->base_addr = io;
dev->irq = irq;
/* allow overriding parameters on command line */
if (unit >= 0) {
sprintf(dev->name, "eth%d", unit);
netdev_boot_setup_check(dev);
}
pr_debug("%s", version);
printk(KERN_INFO "D-Link DE-620 pocket adapter");
if (!request_region(dev->base_addr, 3, "de620")) {
printk(" io 0x%3lX, which is busy.\n", dev->base_addr);
err = -EBUSY;
goto out1;
}
/* Initially, configure basic nibble mode, so we can read the EEPROM */
NIC_Cmd = DEF_NIC_CMD;
de620_set_register(dev, W_EIP, EIPRegister);
/* Anybody out there? */
de620_set_register(dev, W_CPR, checkbyte);
checkbyte = de620_get_register(dev, R_CPR);
if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) {
printk(" not identified in the printer port\n");
err = -ENODEV;
goto out2;
}
/* else, got it! */
dev->dev_addr[0] = nic_data.NodeID[0];
for (i = 1; i < ETH_ALEN; i++) {
dev->dev_addr[i] = nic_data.NodeID[i];
dev->broadcast[i] = 0xff;
}
printk(", Ethernet Address: %pM", dev->dev_addr);
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");
dev->netdev_ops = &de620_netdev_ops;
dev->watchdog_timeo = HZ*2;
/* base_addr and irq are already set, see above! */
/* dump eeprom */
pr_debug("\nEEPROM contents:\n"
"RAM_Size = 0x%02X\n"
"NodeID = %pM\n"
"Model = %d\n"
"Media = %d\n"
"SCR = 0x%02x\n", nic_data.RAM_Size, nic_data.NodeID,
nic_data.Model, nic_data.Media, nic_data.SCR);
err = register_netdev(dev);
if (err)
goto out2;
return dev;
out2:
release_region(dev->base_addr, 3);
out1:
free_netdev(dev);
out:
return ERR_PTR(err);
}
/**********************************
*
* Read info from on-board EEPROM
*
* Note: Bitwise serial I/O to/from the EEPROM vi the status _register_!
*/
#define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister);
static unsigned short __init ReadAWord(struct net_device *dev, int from)
{
unsigned short data;
int nbits;
/* cs [__~~] SET SEND STATE */
/* di [____] */
/* sck [_~~_] */
sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 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(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6);
}
else {
/* cs [~~~~] SEND 0 */
/* di [____] */
/* sck [_~~_] */
sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 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(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7);
}
/* cs [____] RESET SEND STATE */
/* di [____] */
/* sck [_~~_] */
sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0);
return data;
}
static int __init read_eeprom(struct net_device *dev)
{
unsigned short wrd;
/* D-Link Ethernet addresses are in the series 00:80:c8:7X:XX:XX:XX */
wrd = ReadAWord(dev, 0x1aa); /* bytes 0 + 1 of NodeID */
if (!clone && (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(dev, 0x1ab); /* bytes 2 + 3 of NodeID */
if (!clone && ((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(dev, 0x1ac); /* bytes 4 + 5 of NodeID */
nic_data.NodeID[4] = wrd & 0xff;
nic_data.NodeID[5] = wrd >> 8;
wrd = ReadAWord(dev, 0x1ad); /* RAM size in pages (256 bytes). 0 = 64k */
nic_data.RAM_Size = (wrd >> 8);
wrd = ReadAWord(dev, 0x1ae); /* hardware model (CT = 3) */
nic_data.Model = (wrd & 0xff);
wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */
nic_data.Media = (wrd & 0xff);
wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */
nic_data.SCR = (wrd >> 8);
return 0; /* no errors */
}
/******************************************************************************
*
* Loadable module skeleton
*
*/
#ifdef MODULE
static struct net_device *de620_dev;
int __init init_module(void)
{
de620_dev = de620_probe(-1);
if (IS_ERR(de620_dev))
return PTR_ERR(de620_dev);
return 0;
}
void cleanup_module(void)
{
unregister_netdev(de620_dev);
release_region(de620_dev->base_addr, 3);
free_netdev(de620_dev);
}
#endif /* MODULE */
MODULE_LICENSE("GPL");
