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-rw-r--r--drivers/net/de620.c1047
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diff --git a/drivers/net/de620.c b/drivers/net/de620.c
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+/*
+ * 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)
+ * -DDE602_DEBUG=...
+ * -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
+ */
+
+/*
+ * Enable debugging by "-DDE620_DEBUG=3" when compiling,
+ * 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
+
+#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 */
+
+#ifdef DE620_DEBUG /* Compile-time configurable */
+#define PRINTK(x) if (de620_debug >= 2) printk x
+#else
+#define DE620_DEBUG 0
+#define PRINTK(x) /**/
+#endif
+
+
+/*
+ * 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 unsigned int de620_debug = DE620_DEBUG;
+
+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_param(de620_debug, 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)");
+MODULE_PARM_DESC(de620_debug, "DE-620 debug level (0-2)");
+
+/***********************************************
+ * *
+ * 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 struct net_device_stats *get_stats(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 *, struct pt_regs *);
+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;
+}
+
+/*********************************************
+ *
+ * Return current statistics
+ *
+ */
+static struct net_device_stats *get_stats(struct net_device *dev)
+{
+ return (struct net_device_stats *)(dev->priv);
+}
+
+/*********************************************
+ *
+ * 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 (dev->mc_count || dev->flags&(IFF_ALLMULTI|IFF_PROMISC))
+ { /* Enable promiscuous mode */
+ /*
+ * We must make the kernel realise we had to move
+ * into promisc mode or we start all out war on
+ * the cable. - AC
+ */
+ dev->flags|=IFF_PROMISC;
+
+ 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)
+ 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(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 1;
+ }
+ de620_write_block(dev, buffer, skb->len, len-skb->len);
+
+ dev->trans_start = jiffies;
+ if(!(using_txbuf == (TXBF0 | TXBF1)))
+ netif_wake_queue(dev);
+
+ ((struct net_device_stats *)(dev->priv))->tx_packets++;
+ spin_unlock_irqrestore(&de620_lock, flags);
+ dev_kfree_skb (skb);
+ return 0;
+}
+
+/*****************************************************
+ *
+ * Handle the network interface interrupts.
+ *
+ */
+static irqreturn_t
+de620_interrupt(int irq_in, void *dev_id, struct pt_regs *regs)
+{
+ 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);
+
+ 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));
+ }
+
+ 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;
+
+ 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(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));
+ 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(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);
+ ((struct net_device_stats *)(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(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);
+ ((struct net_device_stats *)(dev->priv))->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);
+ ((struct net_device_stats *)(dev->priv))->rx_dropped++;
+ }
+ else { /* Yep! Go get it! */
+ skb_reserve(skb,2); /* Align */
+ skb->dev = dev;
+ /* 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);
+ PRINTK(("Read %d bytes\n", size));
+ skb->protocol=eth_type_trans(skb,dev);
+ netif_rx(skb); /* deliver it "upstairs" */
+ dev->last_rx = jiffies;
+ /* count all receives */
+ ((struct net_device_stats *)(dev->priv))->rx_packets++;
+ ((struct net_device_stats *)(dev->priv))->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);
+ 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 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 */
+}
+
+/******************************************************************************
+ *
+ * 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(sizeof(struct net_device_stats));
+ if (!dev)
+ goto out;
+
+ SET_MODULE_OWNER(dev);
+
+ 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);
+ }
+
+ if (de620_debug)
+ printk(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! */
+ 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");
+
+ dev->get_stats = get_stats;
+ dev->open = de620_open;
+ dev->stop = de620_close;
+ dev->hard_start_xmit = de620_start_xmit;
+ dev->tx_timeout = de620_timeout;
+ dev->watchdog_timeo = HZ*2;
+ dev->set_multicast_list = de620_set_multicast_list;
+
+ /* base_addr and irq are already set, see above! */
+
+ /* 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);
+ }
+
+ 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_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");
+
+
+/*
+ * (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
+*/
+/*
+ * Local variables:
+ * kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
+ * module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
+ * compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
+ * End:
+ */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.