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1ae5dc342a
Now that core network takes care of trans_start updates, dont do it in drivers themselves, if possible. Drivers can avoid one cache miss (on dev->trans_start) in their start_xmit() handler. Exceptions are NETIF_F_LLTX drivers Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
531 lines
13 KiB
C
531 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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#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 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(dev);
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if (tickssofar < HZ/20)
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return NETDEV_TX_BUSY;
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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 NETDEV_TX_BUSY;
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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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pr_debug("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 NETDEV_TX_BUSY;
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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 NETDEV_TX_OK;
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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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pr_debug("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 const struct net_device_ops de600_netdev_ops = {
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.ndo_open = de600_open,
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.ndo_stop = de600_close,
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.ndo_start_xmit = de600_start_xmit,
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.ndo_change_mtu = eth_change_mtu,
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.ndo_set_mac_address = eth_mac_addr,
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.ndo_validate_addr = eth_validate_addr,
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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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pr_debug("%s", 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->netdev_ops = &de600_netdev_ops;
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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 */
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}
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static struct net_device *de600_dev;
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static int __init de600_init(void)
|
|
{
|
|
de600_dev = de600_probe();
|
|
if (IS_ERR(de600_dev))
|
|
return PTR_ERR(de600_dev);
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|
return 0;
|
|
}
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|
|
|
static void __exit de600_exit(void)
|
|
{
|
|
unregister_netdev(de600_dev);
|
|
release_region(DE600_IO, 3);
|
|
free_netdev(de600_dev);
|
|
}
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|
|
|
module_init(de600_init);
|
|
module_exit(de600_exit);
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|
|
|
MODULE_LICENSE("GPL");
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