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![David S. Miller](/assets/img/avatar_default.png)
The generic packet receive code takes care of setting netdev->last_rx when necessary, for the sake of the bonding ARP monitor. Drivers need not do it any more. Some cases had to be skipped over because the drivers were making use of the ->last_rx value themselves. Signed-off-by: David S. Miller <davem@davemloft.net>
535 lines
13 KiB
C
535 lines
13 KiB
C
static const char version[] = "de600.c: $Revision: 1.41-2.5 $, Bjorn Ekwall (bj0rn@blox.se)\n";
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/*
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* de600.c
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*
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* Linux driver for the D-Link DE-600 Ethernet pocket adapter.
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*
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* Portions (C) Copyright 1993, 1994 by Bjorn Ekwall
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* The Author may be reached as bj0rn@blox.se
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*
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* Based on adapter information gathered from DE600.ASM by D-Link Inc.,
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* as included on disk C in the v.2.11 of PC/TCP from FTP Software.
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* For DE600.asm:
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* Portions (C) Copyright 1990 D-Link, Inc.
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* Copyright, 1988-1992, Russell Nelson, Crynwr Software
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*
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* Adapted to the sample network driver core for linux,
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* written by: Donald Becker <becker@super.org>
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* (Now at <becker@scyld.com>)
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*
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**************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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**************************************************************/
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/* Add more time here if your adapter won't work OK: */
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#define DE600_SLOW_DOWN udelay(delay_time)
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/* use 0 for production, 1 for verification, >2 for debug */
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#ifdef DE600_DEBUG
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#define PRINTK(x) if (de600_debug >= 2) printk x
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#else
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#define DE600_DEBUG 0
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#define PRINTK(x) /**/
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#endif
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/string.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/in.h>
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#include <asm/system.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <asm/io.h>
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#include "de600.h"
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static unsigned int de600_debug = DE600_DEBUG;
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module_param(de600_debug, int, 0);
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MODULE_PARM_DESC(de600_debug, "DE-600 debug level (0-2)");
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static unsigned int check_lost = 1;
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module_param(check_lost, bool, 0);
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MODULE_PARM_DESC(check_lost, "If set then check for unplugged de600");
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static unsigned int delay_time = 10;
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module_param(delay_time, int, 0);
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MODULE_PARM_DESC(delay_time, "DE-600 deley on I/O in microseconds");
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/*
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* D-Link driver variables:
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*/
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static volatile int rx_page;
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#define TX_PAGES 2
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static volatile int tx_fifo[TX_PAGES];
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static volatile int tx_fifo_in;
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static volatile int tx_fifo_out;
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static volatile int free_tx_pages = TX_PAGES;
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static int was_down;
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static DEFINE_SPINLOCK(de600_lock);
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static inline u8 de600_read_status(struct net_device *dev)
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{
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u8 status;
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outb_p(STATUS, DATA_PORT);
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status = inb(STATUS_PORT);
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outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
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return status;
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}
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static inline u8 de600_read_byte(unsigned char type, struct net_device *dev)
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{
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/* dev used by macros */
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u8 lo;
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outb_p((type), DATA_PORT);
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lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
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outb_p((type) | HI_NIBBLE, DATA_PORT);
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return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
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}
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/*
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* Open/initialize the board. This is called (in the current kernel)
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* after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
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*
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* This routine should set everything up anew at each open, even
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* registers that "should" only need to be set once at boot, so that
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* there is a non-reboot way to recover if something goes wrong.
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*/
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static int de600_open(struct net_device *dev)
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{
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unsigned long flags;
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int ret = request_irq(DE600_IRQ, de600_interrupt, 0, dev->name, dev);
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if (ret) {
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printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
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return ret;
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}
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spin_lock_irqsave(&de600_lock, flags);
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ret = adapter_init(dev);
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spin_unlock_irqrestore(&de600_lock, flags);
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return ret;
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}
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/*
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* The inverse routine to de600_open().
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*/
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static int de600_close(struct net_device *dev)
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{
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select_nic();
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rx_page = 0;
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de600_put_command(RESET);
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de600_put_command(STOP_RESET);
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de600_put_command(0);
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select_prn();
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free_irq(DE600_IRQ, dev);
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return 0;
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}
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static inline void trigger_interrupt(struct net_device *dev)
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{
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de600_put_command(FLIP_IRQ);
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select_prn();
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DE600_SLOW_DOWN;
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select_nic();
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de600_put_command(0);
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}
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/*
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* Copy a buffer to the adapter transmit page memory.
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* Start sending.
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*/
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static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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unsigned long flags;
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int transmit_from;
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int len;
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int tickssofar;
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u8 *buffer = skb->data;
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int i;
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if (free_tx_pages <= 0) { /* Do timeouts, to avoid hangs. */
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tickssofar = jiffies - dev->trans_start;
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if (tickssofar < 5)
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return 1;
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/* else */
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printk(KERN_WARNING "%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem");
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/* Restart the adapter. */
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spin_lock_irqsave(&de600_lock, flags);
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if (adapter_init(dev)) {
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spin_unlock_irqrestore(&de600_lock, flags);
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return 1;
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}
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spin_unlock_irqrestore(&de600_lock, flags);
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}
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/* Start real output */
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PRINTK(("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages));
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if ((len = skb->len) < RUNT)
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len = RUNT;
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spin_lock_irqsave(&de600_lock, flags);
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select_nic();
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tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
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tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
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if(check_lost)
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{
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/* This costs about 40 instructions per packet... */
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de600_setup_address(NODE_ADDRESS, RW_ADDR);
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de600_read_byte(READ_DATA, dev);
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if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
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if (adapter_init(dev)) {
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spin_unlock_irqrestore(&de600_lock, flags);
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return 1;
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}
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}
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}
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de600_setup_address(transmit_from, RW_ADDR);
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for (i = 0; i < skb->len ; ++i, ++buffer)
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de600_put_byte(*buffer);
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for (; i < len; ++i)
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de600_put_byte(0);
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if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
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dev->trans_start = jiffies;
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netif_start_queue(dev); /* allow more packets into adapter */
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/* Send page and generate a faked interrupt */
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de600_setup_address(transmit_from, TX_ADDR);
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de600_put_command(TX_ENABLE);
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}
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else {
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if (free_tx_pages)
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netif_start_queue(dev);
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else
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netif_stop_queue(dev);
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select_prn();
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}
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spin_unlock_irqrestore(&de600_lock, flags);
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dev_kfree_skb(skb);
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return 0;
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}
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/*
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* The typical workload of the driver:
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* Handle the network interface interrupts.
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*/
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static irqreturn_t de600_interrupt(int irq, void *dev_id)
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{
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struct net_device *dev = dev_id;
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u8 irq_status;
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int retrig = 0;
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int boguscount = 0;
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spin_lock(&de600_lock);
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select_nic();
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irq_status = de600_read_status(dev);
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do {
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PRINTK(("de600_interrupt (%02X)\n", irq_status));
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if (irq_status & RX_GOOD)
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de600_rx_intr(dev);
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else if (!(irq_status & RX_BUSY))
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de600_put_command(RX_ENABLE);
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/* Any transmission in progress? */
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if (free_tx_pages < TX_PAGES)
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retrig = de600_tx_intr(dev, irq_status);
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else
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retrig = 0;
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irq_status = de600_read_status(dev);
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} while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
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/*
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* Yeah, it _looks_ like busy waiting, smells like busy waiting
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* and I know it's not PC, but please, it will only occur once
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* in a while and then only for a loop or so (< 1ms for sure!)
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*/
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/* Enable adapter interrupts */
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select_prn();
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if (retrig)
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trigger_interrupt(dev);
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spin_unlock(&de600_lock);
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return IRQ_HANDLED;
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}
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static int de600_tx_intr(struct net_device *dev, int irq_status)
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{
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/*
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* Returns 1 if tx still not done
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*/
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/* Check if current transmission is done yet */
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if (irq_status & TX_BUSY)
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return 1; /* tx not done, try again */
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/* else */
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/* If last transmission OK then bump fifo index */
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if (!(irq_status & TX_FAILED16)) {
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tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
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++free_tx_pages;
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dev->stats.tx_packets++;
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netif_wake_queue(dev);
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}
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/* More to send, or resend last packet? */
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if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
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dev->trans_start = jiffies;
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de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
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de600_put_command(TX_ENABLE);
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return 1;
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}
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/* else */
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return 0;
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}
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/*
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* We have a good packet, get it out of the adapter.
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*/
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static void de600_rx_intr(struct net_device *dev)
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{
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struct sk_buff *skb;
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int i;
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int read_from;
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int size;
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unsigned char *buffer;
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/* Get size of received packet */
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size = de600_read_byte(RX_LEN, dev); /* low byte */
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size += (de600_read_byte(RX_LEN, dev) << 8); /* high byte */
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size -= 4; /* Ignore trailing 4 CRC-bytes */
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/* Tell adapter where to store next incoming packet, enable receiver */
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read_from = rx_page_adr();
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next_rx_page();
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de600_put_command(RX_ENABLE);
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if ((size < 32) || (size > 1535)) {
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printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
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if (size > 10000)
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adapter_init(dev);
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return;
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}
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skb = dev_alloc_skb(size+2);
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if (skb == NULL) {
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printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
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return;
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}
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/* else */
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skb_reserve(skb,2); /* Align */
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/* 'skb->data' points to the start of sk_buff data area. */
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buffer = skb_put(skb,size);
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/* copy the packet into the buffer */
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de600_setup_address(read_from, RW_ADDR);
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for (i = size; i > 0; --i, ++buffer)
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*buffer = de600_read_byte(READ_DATA, dev);
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skb->protocol=eth_type_trans(skb,dev);
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netif_rx(skb);
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/* update stats */
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dev->stats.rx_packets++; /* count all receives */
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dev->stats.rx_bytes += size; /* count all received bytes */
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/*
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* If any worth-while packets have been received, netif_rx()
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* will work on them when we get to the tasklets.
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*/
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}
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static struct net_device * __init de600_probe(void)
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{
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int i;
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struct net_device *dev;
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int err;
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dev = alloc_etherdev(0);
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if (!dev)
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return ERR_PTR(-ENOMEM);
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if (!request_region(DE600_IO, 3, "de600")) {
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printk(KERN_WARNING "DE600: port 0x%x busy\n", DE600_IO);
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err = -EBUSY;
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goto out;
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}
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printk(KERN_INFO "%s: D-Link DE-600 pocket adapter", dev->name);
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/* Alpha testers must have the version number to report bugs. */
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if (de600_debug > 1)
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printk(version);
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/* probe for adapter */
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err = -ENODEV;
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rx_page = 0;
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select_nic();
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(void)de600_read_status(dev);
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de600_put_command(RESET);
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de600_put_command(STOP_RESET);
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if (de600_read_status(dev) & 0xf0) {
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printk(": not at I/O %#3x.\n", DATA_PORT);
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goto out1;
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}
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/*
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* Maybe we found one,
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* have to check if it is a D-Link DE-600 adapter...
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*/
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/* Get the adapter ethernet address from the ROM */
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de600_setup_address(NODE_ADDRESS, RW_ADDR);
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for (i = 0; i < ETH_ALEN; i++) {
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dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
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dev->broadcast[i] = 0xff;
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}
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/* Check magic code */
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if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
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/* OK, install real address */
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dev->dev_addr[0] = 0x00;
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dev->dev_addr[1] = 0x80;
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dev->dev_addr[2] = 0xc8;
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dev->dev_addr[3] &= 0x0f;
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dev->dev_addr[3] |= 0x70;
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} else {
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printk(" not identified in the printer port\n");
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goto out1;
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}
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printk(", Ethernet Address: %pM\n", dev->dev_addr);
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dev->open = de600_open;
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dev->stop = de600_close;
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dev->hard_start_xmit = &de600_start_xmit;
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dev->flags&=~IFF_MULTICAST;
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select_prn();
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err = register_netdev(dev);
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if (err)
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goto out1;
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return dev;
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out1:
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release_region(DE600_IO, 3);
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out:
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free_netdev(dev);
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return ERR_PTR(err);
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}
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static int adapter_init(struct net_device *dev)
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{
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int i;
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select_nic();
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rx_page = 0; /* used by RESET */
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de600_put_command(RESET);
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de600_put_command(STOP_RESET);
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/* Check if it is still there... */
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/* Get the some bytes of the adapter ethernet address from the ROM */
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de600_setup_address(NODE_ADDRESS, RW_ADDR);
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de600_read_byte(READ_DATA, dev);
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if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
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(de600_read_byte(READ_DATA, dev) != 0x15)) {
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/* was: if (de600_read_status(dev) & 0xf0) { */
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printk("Something has happened to the DE-600! Please check it and do a new ifconfig!\n");
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/* Goodbye, cruel world... */
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dev->flags &= ~IFF_UP;
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de600_close(dev);
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was_down = 1;
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netif_stop_queue(dev); /* Transmit busy... */
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return 1; /* failed */
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}
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if (was_down) {
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printk(KERN_INFO "%s: Thanks, I feel much better now!\n", dev->name);
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was_down = 0;
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}
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tx_fifo_in = 0;
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tx_fifo_out = 0;
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free_tx_pages = TX_PAGES;
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/* set the ether address. */
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de600_setup_address(NODE_ADDRESS, RW_ADDR);
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for (i = 0; i < ETH_ALEN; i++)
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de600_put_byte(dev->dev_addr[i]);
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/* where to start saving incoming packets */
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rx_page = RX_BP | RX_BASE_PAGE;
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de600_setup_address(MEM_4K, RW_ADDR);
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/* Enable receiver */
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de600_put_command(RX_ENABLE);
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select_prn();
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netif_start_queue(dev);
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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");
|