de600.c
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上传日期:2013-04-10
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- static const char version[] =
- "de600.c: $Revision: 1.40 $, 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>)
- *
- * compile-command:
- * "gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer
- * -m486 -c de600.c
- *
- **************************************************************/
- /*
- * 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 :-) */
- /*
- * If you want to enable automatic continuous checking for the DE600,
- * keep this #define enabled.
- * It doesn't cost much per packet, so I think it is worth it!
- * If you disagree, comment away the #define, and live with it...
- *
- */
- #define CHECK_LOST_DE600
- /*
- * 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.
- * (Depends on the CHECK_LOST_DE600 above)
- *
- */
- #define SHUTDOWN_WHEN_LOST
- /*
- * See comment at "de600_rspace()"!
- * This is an *ugly* hack, but for now it achieves its goal of
- * faking a TCP flow-control that will not flood the poor DE600.
- *
- * Tricks TCP to announce a small max window (max 2 fast packets please :-)
- *
- * Comment away at your own risk!
- *
- * Update: Use the more general per-device maxwindow parameter instead.
- */
- #undef FAKE_SMALL_MAX
- /* 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/sched.h>
- #include <linux/types.h>
- #include <linux/fcntl.h>
- #include <linux/string.h>
- #include <linux/interrupt.h>
- #include <linux/ioport.h>
- #include <asm/io.h>
- #include <linux/in.h>
- #include <linux/ptrace.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>
- static unsigned int de600_debug = DE600_DEBUG;
- MODULE_PARM(de600_debug, "i");
- MODULE_PARM_DESC(de600_debug, "DE-600 debug level (0-2)");
- static unsigned int delay_time = 10;
- MODULE_PARM(delay_time, "i");
- MODULE_PARM_DESC(delay_time, "DE-600 deley on I/O in microseconds");
- #ifdef FAKE_SMALL_MAX
- static unsigned long de600_rspace(struct sock *sk);
- #include <net/sock.h>
- #endif
- typedef unsigned char byte;
- /**************************************************
- * *
- * Definition of D-Link Ethernet Pocket adapter *
- * *
- **************************************************/
- /*
- * D-Link Ethernet pocket adapter ports
- */
- /*
- * OK, so I'm cheating, but there are an awful lot of
- * reads and writes in order to get anything in and out
- * of the DE-600 with 4 bits at a time in the parallel port,
- * so every saved instruction really helps :-)
- *
- * That is, I don't care what the device struct says
- * but hope that Space.c will keep the rest of the drivers happy.
- */
- #ifndef DE600_IO
- #define DE600_IO 0x378
- #endif
- #define DATA_PORT (DE600_IO)
- #define STATUS_PORT (DE600_IO + 1)
- #define COMMAND_PORT (DE600_IO + 2)
- #ifndef DE600_IRQ
- #define DE600_IRQ 7
- #endif
- /*
- * It really should look like this, and autoprobing as well...
- *
- #define DATA_PORT (dev->base_addr + 0)
- #define STATUS_PORT (dev->base_addr + 1)
- #define COMMAND_PORT (dev->base_addr + 2)
- #define DE600_IRQ dev->irq
- */
- /*
- * D-Link COMMAND_PORT commands
- */
- #define SELECT_NIC 0x04 /* select Network Interface Card */
- #define SELECT_PRN 0x1c /* select Printer */
- #define NML_PRN 0xec /* normal Printer situation */
- #define IRQEN 0x10 /* enable IRQ line */
- /*
- * D-Link STATUS_PORT
- */
- #define RX_BUSY 0x80
- #define RX_GOOD 0x40
- #define TX_FAILED16 0x10
- #define TX_BUSY 0x08
- /*
- * D-Link DATA_PORT commands
- * command in low 4 bits
- * data in high 4 bits
- * select current data nibble with HI_NIBBLE bit
- */
- #define WRITE_DATA 0x00 /* write memory */
- #define READ_DATA 0x01 /* read memory */
- #define STATUS 0x02 /* read status register */
- #define COMMAND 0x03 /* write command register (see COMMAND below) */
- #define NULL_COMMAND 0x04 /* null command */
- #define RX_LEN 0x05 /* read received packet length */
- #define TX_ADDR 0x06 /* set adapter transmit memory address */
- #define RW_ADDR 0x07 /* set adapter read/write memory address */
- #define HI_NIBBLE 0x08 /* read/write the high nibble of data,
- or-ed with rest of command */
- /*
- * command register, accessed through DATA_PORT with low bits = COMMAND
- */
- #define RX_ALL 0x01 /* PROMISCUOUS */
- #define RX_BP 0x02 /* default: BROADCAST & PHYSICAL ADDRESS */
- #define RX_MBP 0x03 /* MULTICAST, BROADCAST & PHYSICAL ADDRESS */
- #define TX_ENABLE 0x04 /* bit 2 */
- #define RX_ENABLE 0x08 /* bit 3 */
- #define RESET 0x80 /* set bit 7 high */
- #define STOP_RESET 0x00 /* set bit 7 low */
- /*
- * data to command register
- * (high 4 bits in write to DATA_PORT)
- */
- #define RX_PAGE2_SELECT 0x10 /* bit 4, only 2 pages to select */
- #define RX_BASE_PAGE 0x20 /* bit 5, always set when specifying RX_ADDR */
- #define FLIP_IRQ 0x40 /* bit 6 */
- /*
- * D-Link adapter internal memory:
- *
- * 0-2K 1:st transmit page (send from pointer up to 2K)
- * 2-4K 2:nd transmit page (send from pointer up to 4K)
- *
- * 4-6K 1:st receive page (data from 4K upwards)
- * 6-8K 2:nd receive page (data from 6K upwards)
- *
- * 8K+ Adapter ROM (contains magic code and last 3 bytes of Ethernet address)
- */
- #define MEM_2K 0x0800 /* 2048 */
- #define MEM_4K 0x1000 /* 4096 */
- #define MEM_6K 0x1800 /* 6144 */
- #define NODE_ADDRESS 0x2000 /* 8192 */
- #define RUNT 60 /* Too small Ethernet packet */
- /**************************************************
- * *
- * End of definition *
- * *
- **************************************************/
- /*
- * Index to functions, as function prototypes.
- */
- /* Routines used internally. (See "convenience macros") */
- static byte de600_read_status(struct net_device *dev);
- static byte de600_read_byte(unsigned char type, struct net_device *dev);
- /* Put in the device structure. */
- static int de600_open(struct net_device *dev);
- static int de600_close(struct net_device *dev);
- static struct net_device_stats *get_stats(struct net_device *dev);
- static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev);
- /* Dispatch from interrupts. */
- static void de600_interrupt(int irq, void *dev_id, struct pt_regs *regs);
- static int de600_tx_intr(struct net_device *dev, int irq_status);
- static void de600_rx_intr(struct net_device *dev);
- /* Initialization */
- static void trigger_interrupt(struct net_device *dev);
- int de600_probe(struct net_device *dev);
- static int adapter_init(struct net_device *dev);
- /*
- * 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;
- /*
- * Convenience macros/functions for D-Link adapter
- */
- #define select_prn() outb_p(SELECT_PRN, COMMAND_PORT); DE600_SLOW_DOWN
- #define select_nic() outb_p(SELECT_NIC, COMMAND_PORT); DE600_SLOW_DOWN
- /* Thanks for hints from Mark Burton <markb@ordern.demon.co.uk> */
- #define de600_put_byte(data) (
- outb_p(((data) << 4) | WRITE_DATA , DATA_PORT),
- outb_p(((data) & 0xf0) | WRITE_DATA | HI_NIBBLE, DATA_PORT))
- /*
- * The first two outb_p()'s below could perhaps be deleted if there
- * would be more delay in the last two. Not certain about it yet...
- */
- #define de600_put_command(cmd) (
- outb_p(( rx_page << 4) | COMMAND , DATA_PORT),
- outb_p(( rx_page & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT),
- outb_p(((rx_page | cmd) << 4) | COMMAND , DATA_PORT),
- outb_p(((rx_page | cmd) & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT))
- #define de600_setup_address(addr,type) (
- outb_p((((addr) << 4) & 0xf0) | type , DATA_PORT),
- outb_p(( (addr) & 0xf0) | type | HI_NIBBLE, DATA_PORT),
- outb_p((((addr) >> 4) & 0xf0) | type , DATA_PORT),
- outb_p((((addr) >> 8) & 0xf0) | type | HI_NIBBLE, DATA_PORT))
- #define rx_page_adr() ((rx_page & RX_PAGE2_SELECT)?(MEM_6K):(MEM_4K))
- /* Flip bit, only 2 pages */
- #define next_rx_page() (rx_page ^= RX_PAGE2_SELECT)
- #define tx_page_adr(a) (((a) + 1) * MEM_2K)
- static inline byte
- de600_read_status(struct net_device *dev)
- {
- byte status;
- outb_p(STATUS, DATA_PORT);
- status = inb(STATUS_PORT);
- outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
- return status;
- }
- static inline byte
- de600_read_byte(unsigned char type, struct net_device *dev) { /* dev used by macros */
- byte lo;
- (void)outb_p((type), DATA_PORT);
- lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
- (void)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)
- {
- int ret = request_irq(DE600_IRQ, de600_interrupt, 0, dev->name, dev);
- if (ret) {
- printk ("%s: unable to get IRQ %dn", dev->name, DE600_IRQ);
- return ret;
- }
- if (adapter_init(dev))
- return -EIO;
- return 0;
- }
- /*
- * 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();
- if (netif_running(dev)) { /* perhaps not needed? */
- 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;
- byte *buffer = skb->data;
- if (free_tx_pages <= 0) { /* 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)) {
- return 1;
- }
- }
- /* Start real output */
- PRINTK(("de600_start_xmit:len=%d, page %d/%dn", skb->len, tx_fifo_in, free_tx_pages));
- if ((len = skb->len) < RUNT)
- len = RUNT;
- save_flags(flags);
- cli();
- 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 */
- #ifdef CHECK_LOST_DE600
- /* 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)) {
- restore_flags(flags);
- return 1;
- }
- }
- #endif
- de600_setup_address(transmit_from, RW_ADDR);
- for ( ; len > 0; --len, ++buffer)
- de600_put_byte(*buffer);
- 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();
- }
- restore_flags(flags);
- #ifdef FAKE_SMALL_MAX
- /* This will "patch" the socket TCP proto at an early moment */
- if (skb->sk && (skb->sk->protocol == IPPROTO_TCP) &&
- (skb->sk->prot->rspace != &de600_rspace))
- skb->sk->prot->rspace = de600_rspace; /* Ugh! */
- #endif
- dev_kfree_skb (skb);
- return 0;
- }
- /*
- * The typical workload of the driver:
- * Handle the network interface interrupts.
- */
- static void
- de600_interrupt(int irq, void *dev_id, struct pt_regs * regs)
- {
- struct net_device *dev = dev_id;
- byte 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("%s: bogus interrupt %dn", dev?dev->name:"DE-600", irq);
- return;
- }
- 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);
- return;
- }
- 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;
- unsigned long flags;
- int i;
- int read_from;
- int size;
- register unsigned char *buffer;
- save_flags(flags);
- cli();
- /* 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);
- restore_flags(flags);
- if ((size < 32) || (size > 1535)) {
- printk("%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()
- * has done a mark_bh(INET_BH) for us and will work on them
- * when we get to the bottom-half routine.
- */
- }
- int __init
- de600_probe(struct net_device *dev)
- {
- int i;
- static struct net_device_stats de600_netstats;
- /*dev->priv = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL);*/
- SET_MODULE_OWNER(dev);
- printk("%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 */
- 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);
- return -ENODEV;
- }
- /*
- * 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 portn");
- return -ENODEV;
- }
- #if 0 /* Not yet */
- if (check_region(DE600_IO, 3)) {
- printk(", port 0x%x busyn", DE600_IO);
- return -EBUSY;
- }
- #endif
- request_region(DE600_IO, 3, "de600");
- printk(", Ethernet Address: %02X", dev->dev_addr[0]);
- for (i = 1; i < ETH_ALEN; i++)
- printk(":%02X",dev->dev_addr[i]);
- printk("n");
- /* Initialize the device structure. */
- dev->priv = &de600_netstats;
- memset(dev->priv, 0, sizeof(struct net_device_stats));
- dev->get_stats = get_stats;
- dev->open = de600_open;
- dev->stop = de600_close;
- dev->hard_start_xmit = &de600_start_xmit;
- ether_setup(dev);
- dev->flags&=~IFF_MULTICAST;
- select_prn();
- return 0;
- }
- static int
- adapter_init(struct net_device *dev)
- {
- int i;
- unsigned long flags;
- save_flags(flags);
- cli();
- select_nic();
- rx_page = 0; /* used by RESET */
- de600_put_command(RESET);
- de600_put_command(STOP_RESET);
- #ifdef CHECK_LOST_DE600
- /* 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"
- #ifdef SHUTDOWN_WHEN_LOST
- " and do a new ifconfig"
- #endif /* SHUTDOWN_WHEN_LOST */
- "!n");
- #ifdef SHUTDOWN_WHEN_LOST
- /* Goodbye, cruel world... */
- dev->flags &= ~IFF_UP;
- de600_close(dev);
- #endif /* SHUTDOWN_WHEN_LOST */
- was_down = 1;
- netif_stop_queue(dev); /* Transmit busy... */
- restore_flags(flags);
- return 1; /* failed */
- }
- #endif /* CHECK_LOST_DE600 */
- if (was_down) {
- printk("Thanks, I feel much better now!n");
- was_down = 0;
- }
- netif_start_queue(dev);
- 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();
- restore_flags(flags);
- return 0; /* OK */
- }
- #ifdef FAKE_SMALL_MAX
- /*
- * The new router code (coming soon 8-) ) will fix this properly.
- */
- #define DE600_MIN_WINDOW 1024
- #define DE600_MAX_WINDOW 2048
- #define DE600_TCP_WINDOW_DIFF 1024
- /*
- * Copied from "net/inet/sock.c"
- *
- * Sets a lower max receive window in order to achieve <= 2
- * packets arriving at the adapter in fast succession.
- * (No way that a DE-600 can keep up with a net saturated
- * with packets homing in on it :-( )
- *
- * Since there are only 2 receive buffers in the DE-600
- * and it takes some time to copy from the adapter,
- * this is absolutely necessary for any TCP performance whatsoever!
- *
- * Note that the returned window info will never be smaller than
- * DE600_MIN_WINDOW, i.e. 1024
- * This differs from the standard function, that can return an
- * arbitrarily small window!
- */
- static unsigned long
- de600_rspace(struct sock *sk)
- {
- int amt;
- if (sk != NULL) {
- /*
- * Hack! You might want to play with commenting away the following line,
- * if you know what you do!
- sk->max_unacked = DE600_MAX_WINDOW - DE600_TCP_WINDOW_DIFF;
- */
- if (atomic_read(&sk->rmem_alloc) >= sk->rcvbuf-2*DE600_MIN_WINDOW) return(0);
- amt = min_t(int, (sk->rcvbuf-atomic_read(&sk->rmem_alloc))/2/*-DE600_MIN_WINDOW*/, DE600_MAX_WINDOW);
- if (amt < 0) return(0);
- return(amt);
- }
- return(0);
- }
- #endif
- #ifdef MODULE
- static struct net_device de600_dev;
- int
- init_module(void)
- {
- de600_dev.init = de600_probe;
- if (register_netdev(&de600_dev) != 0)
- return -EIO;
- return 0;
- }
- void
- cleanup_module(void)
- {
- unregister_netdev(&de600_dev);
- release_region(DE600_IO, 3);
- }
- #endif /* MODULE */
- MODULE_LICENSE("GPL");
- /*
- * Local variables:
- * kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de600.c"
- * module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de600.c"
- * compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de600.c"
- * End:
- */