1 files changed, 561 insertions, 0 deletions

diff --git a/drivers/net/de600.c b/drivers/net/de600.c
new file mode 100644
index 000000000000..56a100fb9e4b
--- /dev/null
+++ b/drivers/net/de600.c
@@ -0,0 +1,561 @@
+static const char version[] = "de600.c: $Revision: 1.41-2.5 $,  Bjorn Ekwall (bj0rn@blox.se)\n";
+/*
+ *      de600.c
+ *
+ *      Linux driver for the D-Link DE-600 Ethernet pocket adapter.
+ *
+ *      Portions (C) Copyright 1993, 1994 by Bjorn Ekwall
+ *      The Author may be reached as bj0rn@blox.se
+ *
+ *      Based on adapter information gathered from DE600.ASM by D-Link Inc.,
+ *      as included on disk C in the v.2.11 of PC/TCP from FTP Software.
+ *      For DE600.asm:
+ *              Portions (C) Copyright 1990 D-Link, Inc.
+ *              Copyright, 1988-1992, 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>)
+ *
+ **************************************************************/
+/*
+ *      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.
+ *
+ **************************************************************/
+
+/* Add more time here if your adapter won't work OK: */
+#define DE600_SLOW_DOWN udelay(delay_time)
+
+ /*
+ * If you still have trouble reading/writing to the adapter,
+ * modify the following "#define": (see <asm/io.h> for more info)
+#define REALLY_SLOW_IO
+ */
+#define SLOW_IO_BY_JUMPING /* Looks "better" than dummy write to port 0x80 :-) */
+
+/* use 0 for production, 1 for verification, >2 for debug */
+#ifdef DE600_DEBUG
+#define PRINTK(x) if (de600_debug >= 2) printk x
+#else
+#define DE600_DEBUG 0
+#define PRINTK(x) /**/
+#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 <asm/system.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+#include <asm/io.h>
+
+#include "de600.h"
+
+static unsigned int de600_debug = DE600_DEBUG;
+module_param(de600_debug, int, 0);
+MODULE_PARM_DESC(de600_debug, "DE-600 debug level (0-2)");
+
+static unsigned int check_lost = 1;
+module_param(check_lost, bool, 0);
+MODULE_PARM_DESC(check_lost, "If set then check for unplugged de600");
+
+static unsigned int delay_time = 10;
+module_param(delay_time, int, 0);
+MODULE_PARM_DESC(delay_time, "DE-600 deley on I/O in microseconds");
+
+
+/*
+ * D-Link driver variables:
+ */
+
+static volatile int             rx_page;
+
+#define TX_PAGES 2
+static volatile int             tx_fifo[TX_PAGES];
+static volatile int             tx_fifo_in;
+static volatile int             tx_fifo_out;
+static volatile int             free_tx_pages = TX_PAGES;
+static int                      was_down;
+static DEFINE_SPINLOCK(de600_lock);
+
+static inline u8 de600_read_status(struct net_device *dev)
+{
+        u8 status;
+
+        outb_p(STATUS, DATA_PORT);
+        status = inb(STATUS_PORT);
+        outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
+
+        return status;
+}
+
+static inline u8 de600_read_byte(unsigned char type, struct net_device *dev)
+{
+        /* dev used by macros */
+        u8 lo;
+        outb_p((type), DATA_PORT);
+        lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
+        outb_p((type) | HI_NIBBLE, DATA_PORT);
+        return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
+}
+
+/*
+ * Open/initialize the board.  This is called (in the current kernel)
+ * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
+ *
+ * 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 de600_open(struct net_device *dev)
+{
+        unsigned long flags;
+        int ret = request_irq(DE600_IRQ, de600_interrupt, 0, dev->name, dev);
+        if (ret) {
+                printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
+                return ret;
+        }
+        spin_lock_irqsave(&de600_lock, flags);
+        ret = adapter_init(dev);
+        spin_unlock_irqrestore(&de600_lock, flags);
+        return ret;
+}
+
+/*
+ * The inverse routine to de600_open().
+ */
+
+static int de600_close(struct net_device *dev)
+{
+        select_nic();
+        rx_page = 0;
+        de600_put_command(RESET);
+        de600_put_command(STOP_RESET);
+        de600_put_command(0);
+        select_prn();
+        free_irq(DE600_IRQ, dev);
+        return 0;
+}
+
+static struct net_device_stats *get_stats(struct net_device *dev)
+{
+        return (struct net_device_stats *)(dev->priv);
+}
+
+static inline void trigger_interrupt(struct net_device *dev)
+{
+        de600_put_command(FLIP_IRQ);
+        select_prn();
+        DE600_SLOW_DOWN;
+        select_nic();
+        de600_put_command(0);
+}
+
+/*
+ * Copy a buffer to the adapter transmit page memory.
+ * Start sending.
+ */
+ 
+static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+        unsigned long flags;
+        int     transmit_from;
+        int     len;
+        int     tickssofar;
+        u8      *buffer = skb->data;
+        int     i;
+
+        if (free_tx_pages <= 0) {       /* Do timeouts, to avoid hangs. */
+                tickssofar = jiffies - dev->trans_start;
+                if (tickssofar < 5)
+                        return 1;
+                /* else */
+                printk(KERN_WARNING "%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem");
+                /* Restart the adapter. */
+                spin_lock_irqsave(&de600_lock, flags);
+                if (adapter_init(dev)) {
+                        spin_unlock_irqrestore(&de600_lock, flags);
+                        return 1;
+                }
+                spin_unlock_irqrestore(&de600_lock, flags);
+        }
+
+        /* Start real output */
+        PRINTK(("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages));
+
+        if ((len = skb->len) < RUNT)
+                len = RUNT;
+
+        spin_lock_irqsave(&de600_lock, flags);
+        select_nic();
+        tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
+        tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
+
+        if(check_lost)
+        {
+                /* This costs about 40 instructions per packet... */
+                de600_setup_address(NODE_ADDRESS, RW_ADDR);
+                de600_read_byte(READ_DATA, dev);
+                if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
+                        if (adapter_init(dev)) {
+                                spin_unlock_irqrestore(&de600_lock, flags);
+                                return 1;
+                        }
+                }
+        }
+
+        de600_setup_address(transmit_from, RW_ADDR);
+        for (i = 0;  i < skb->len ; ++i, ++buffer)
+                de600_put_byte(*buffer);
+        for (; i < len; ++i)
+                de600_put_byte(0);
+
+        if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
+                dev->trans_start = jiffies;
+                netif_start_queue(dev); /* allow more packets into adapter */
+                /* Send page and generate a faked interrupt */
+                de600_setup_address(transmit_from, TX_ADDR);
+                de600_put_command(TX_ENABLE);
+        }
+        else {
+                if (free_tx_pages)
+                        netif_start_queue(dev);
+                else
+                        netif_stop_queue(dev);
+                select_prn();
+        }
+        spin_unlock_irqrestore(&de600_lock, flags);
+        dev_kfree_skb(skb);
+        return 0;
+}
+
+/*
+ * The typical workload of the driver:
+ * Handle the network interface interrupts.
+ */
+
+static irqreturn_t de600_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+        struct net_device       *dev = dev_id;
+        u8              irq_status;
+        int             retrig = 0;
+        int             boguscount = 0;
+
+        /* This might just as well be deleted now, no crummy drivers present :-) */
+        if ((dev == NULL) || (DE600_IRQ != irq)) {
+                printk(KERN_ERR "%s: bogus interrupt %d\n", dev?dev->name:"DE-600", irq);
+                return IRQ_NONE;
+        }
+
+        spin_lock(&de600_lock);
+        
+        select_nic();
+        irq_status = de600_read_status(dev);
+
+        do {
+                PRINTK(("de600_interrupt (%02X)\n", irq_status));
+
+                if (irq_status & RX_GOOD)
+                        de600_rx_intr(dev);
+                else if (!(irq_status & RX_BUSY))
+                        de600_put_command(RX_ENABLE);
+
+                /* Any transmission in progress? */
+                if (free_tx_pages < TX_PAGES)
+                        retrig = de600_tx_intr(dev, irq_status);
+                else
+                        retrig = 0;
+
+                irq_status = de600_read_status(dev);
+        } while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
+        /*
+         * Yeah, it _looks_ like busy waiting, smells like busy waiting
+         * and I know it's not PC, but please, it will only occur once
+         * in a while and then only for a loop or so (< 1ms for sure!)
+         */
+
+        /* Enable adapter interrupts */
+        select_prn();
+        if (retrig)
+                trigger_interrupt(dev);
+        spin_unlock(&de600_lock);
+        return IRQ_HANDLED;
+}
+
+static int de600_tx_intr(struct net_device *dev, int irq_status)
+{
+        /*
+         * Returns 1 if tx still not done
+         */
+
+        /* Check if current transmission is done yet */
+        if (irq_status & TX_BUSY)
+                return 1; /* tx not done, try again */
+
+        /* else */
+        /* If last transmission OK then bump fifo index */
+        if (!(irq_status & TX_FAILED16)) {
+                tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
+                ++free_tx_pages;
+                ((struct net_device_stats *)(dev->priv))->tx_packets++;
+                netif_wake_queue(dev);
+        }
+
+        /* More to send, or resend last packet? */
+        if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
+                dev->trans_start = jiffies;
+                de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
+                de600_put_command(TX_ENABLE);
+                return 1;
+        }
+        /* else */
+
+        return 0;
+}
+
+/*
+ * We have a good packet, get it out of the adapter.
+ */
+static void de600_rx_intr(struct net_device *dev)
+{
+        struct sk_buff  *skb;
+        int             i;
+        int             read_from;
+        int             size;
+        unsigned char   *buffer;
+
+        /* Get size of received packet */
+        size = de600_read_byte(RX_LEN, dev);    /* low byte */
+        size += (de600_read_byte(RX_LEN, dev) << 8);    /* high byte */
+        size -= 4;      /* Ignore trailing 4 CRC-bytes */
+
+        /* Tell adapter where to store next incoming packet, enable receiver */
+        read_from = rx_page_adr();
+        next_rx_page();
+        de600_put_command(RX_ENABLE);
+
+        if ((size < 32)  ||  (size > 1535)) {
+                printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
+                if (size > 10000)
+                        adapter_init(dev);
+                return;
+        }
+
+        skb = dev_alloc_skb(size+2);
+        if (skb == NULL) {
+                printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
+                return;
+        }
+        /* else */
+
+        skb->dev = dev;
+        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 */
+        de600_setup_address(read_from, RW_ADDR);
+        for (i = size; i > 0; --i, ++buffer)
+                *buffer = de600_read_byte(READ_DATA, dev);
+
+        skb->protocol=eth_type_trans(skb,dev);
+
+        netif_rx(skb);
+
+        /* update stats */
+        dev->last_rx = jiffies;
+        ((struct net_device_stats *)(dev->priv))->rx_packets++; /* count all receives */
+        ((struct net_device_stats *)(dev->priv))->rx_bytes += size; /* count all received bytes */
+
+        /*
+         * If any worth-while packets have been received, netif_rx()
+         * will work on them when we get to the tasklets.
+         */
+}
+
+static struct net_device * __init de600_probe(void)
+{
+        int     i;
+        struct net_device *dev;
+        int err;
+
+        dev = alloc_etherdev(sizeof(struct net_device_stats));
+        if (!dev)
+                return ERR_PTR(-ENOMEM);
+
+        SET_MODULE_OWNER(dev);
+
+        if (!request_region(DE600_IO, 3, "de600")) {
+                printk(KERN_WARNING "DE600: port 0x%x busy\n", DE600_IO);
+                err = -EBUSY;
+                goto out;
+        }
+
+        printk(KERN_INFO "%s: D-Link DE-600 pocket adapter", dev->name);
+        /* Alpha testers must have the version number to report bugs. */
+        if (de600_debug > 1)
+                printk(version);
+
+        /* probe for adapter */
+        err = -ENODEV;
+        rx_page = 0;
+        select_nic();
+        (void)de600_read_status(dev);
+        de600_put_command(RESET);
+        de600_put_command(STOP_RESET);
+        if (de600_read_status(dev) & 0xf0) {
+                printk(": not at I/O %#3x.\n", DATA_PORT);
+                goto out1;
+        }
+
+        /*
+         * Maybe we found one,
+         * have to check if it is a D-Link DE-600 adapter...
+         */
+
+        /* Get the adapter ethernet address from the ROM */
+        de600_setup_address(NODE_ADDRESS, RW_ADDR);
+        for (i = 0; i < ETH_ALEN; i++) {
+                dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
+                dev->broadcast[i] = 0xff;
+        }
+
+        /* Check magic code */
+        if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
+                /* OK, install real address */
+                dev->dev_addr[0] = 0x00;
+                dev->dev_addr[1] = 0x80;
+                dev->dev_addr[2] = 0xc8;
+                dev->dev_addr[3] &= 0x0f;
+                dev->dev_addr[3] |= 0x70;
+        } else {
+                printk(" not identified in the printer port\n");
+                goto out1;
+        }
+
+        printk(", Ethernet Address: %02X", dev->dev_addr[0]);
+        for (i = 1; i < ETH_ALEN; i++)
+                printk(":%02X",dev->dev_addr[i]);
+        printk("\n");
+
+        dev->get_stats = get_stats;
+
+        dev->open = de600_open;
+        dev->stop = de600_close;
+        dev->hard_start_xmit = &de600_start_xmit;
+
+        dev->flags&=~IFF_MULTICAST;
+
+        select_prn();
+
+        err = register_netdev(dev);
+        if (err)
+                goto out1;
+
+        return dev;
+
+out1:
+        release_region(DE600_IO, 3);
+out:
+        free_netdev(dev);
+        return ERR_PTR(err);
+}
+
+static int adapter_init(struct net_device *dev)
+{
+        int     i;
+
+        select_nic();
+        rx_page = 0; /* used by RESET */
+        de600_put_command(RESET);
+        de600_put_command(STOP_RESET);
+
+        /* Check if it is still there... */
+        /* Get the some bytes of the adapter ethernet address from the ROM */
+        de600_setup_address(NODE_ADDRESS, RW_ADDR);
+        de600_read_byte(READ_DATA, dev);
+        if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
+            (de600_read_byte(READ_DATA, dev) != 0x15)) {
+        /* was: if (de600_read_status(dev) & 0xf0) { */
+                printk("Something has happened to the DE-600!  Please check it and do a new ifconfig!\n");
+                /* Goodbye, cruel world... */
+                dev->flags &= ~IFF_UP;
+                de600_close(dev);
+                was_down = 1;
+                netif_stop_queue(dev); /* Transmit busy...  */
+                return 1; /* failed */
+        }
+
+        if (was_down) {
+                printk(KERN_INFO "%s: Thanks, I feel much better now!\n", dev->name);
+                was_down = 0;
+        }
+
+        tx_fifo_in = 0;
+        tx_fifo_out = 0;
+        free_tx_pages = TX_PAGES;
+
+
+        /* set the ether address. */
+        de600_setup_address(NODE_ADDRESS, RW_ADDR);
+        for (i = 0; i < ETH_ALEN; i++)
+                de600_put_byte(dev->dev_addr[i]);
+
+        /* where to start saving incoming packets */
+        rx_page = RX_BP | RX_BASE_PAGE;
+        de600_setup_address(MEM_4K, RW_ADDR);
+        /* Enable receiver */
+        de600_put_command(RX_ENABLE);
+        select_prn();
+
+        netif_start_queue(dev);
+
+        return 0; /* OK */
+}
+
+static struct net_device *de600_dev;
+
+static int __init de600_init(void)
+{
+        de600_dev = de600_probe();
+        if (IS_ERR(de600_dev))
+                return PTR_ERR(de600_dev);
+        return 0;
+}
+
+static void __exit de600_exit(void)
+{
+        unregister_netdev(de600_dev);
+        release_region(DE600_IO, 3);
+        free_netdev(de600_dev);
+}
+
+module_init(de600_init);
+module_exit(de600_exit);
+
+MODULE_LICENSE("GPL");