2005-04-17 00:20:36 +02:00
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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 struct net_device_stats *get_stats(struct net_device *dev)
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{
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return (struct net_device_stats *)(dev->priv);
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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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2006-09-13 19:24:59 +02:00
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2005-04-17 00:20:36 +02:00
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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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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:55:46 +02:00
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static irqreturn_t de600_interrupt(int irq, void *dev_id)
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2005-04-17 00:20:36 +02:00
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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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2006-09-13 19:24:59 +02:00
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2005-04-17 00:20:36 +02:00
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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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((struct net_device_stats *)(dev->priv))->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;
|
|
|
|
|
|
|
|
/* Get size of received packet */
|
|
|
|
size = de600_read_byte(RX_LEN, dev); /* low byte */
|
|
|
|
size += (de600_read_byte(RX_LEN, dev) << 8); /* high byte */
|
|
|
|
size -= 4; /* Ignore trailing 4 CRC-bytes */
|
|
|
|
|
|
|
|
/* Tell adapter where to store next incoming packet, enable receiver */
|
|
|
|
read_from = rx_page_adr();
|
|
|
|
next_rx_page();
|
|
|
|
de600_put_command(RX_ENABLE);
|
|
|
|
|
|
|
|
if ((size < 32) || (size > 1535)) {
|
|
|
|
printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
|
|
|
|
if (size > 10000)
|
|
|
|
adapter_init(dev);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
skb = dev_alloc_skb(size+2);
|
|
|
|
if (skb == NULL) {
|
|
|
|
printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
/* else */
|
|
|
|
|
|
|
|
skb_reserve(skb,2); /* Align */
|
|
|
|
|
|
|
|
/* 'skb->data' points to the start of sk_buff data area. */
|
|
|
|
buffer = skb_put(skb,size);
|
|
|
|
|
|
|
|
/* copy the packet into the buffer */
|
|
|
|
de600_setup_address(read_from, RW_ADDR);
|
|
|
|
for (i = size; i > 0; --i, ++buffer)
|
|
|
|
*buffer = de600_read_byte(READ_DATA, dev);
|
|
|
|
|
|
|
|
skb->protocol=eth_type_trans(skb,dev);
|
|
|
|
|
|
|
|
netif_rx(skb);
|
|
|
|
|
|
|
|
/* update stats */
|
|
|
|
dev->last_rx = jiffies;
|
|
|
|
((struct net_device_stats *)(dev->priv))->rx_packets++; /* count all receives */
|
|
|
|
((struct net_device_stats *)(dev->priv))->rx_bytes += size; /* count all received bytes */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If any worth-while packets have been received, netif_rx()
|
|
|
|
* will work on them when we get to the tasklets.
|
|
|
|
*/
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct net_device * __init de600_probe(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
struct net_device *dev;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
dev = alloc_etherdev(sizeof(struct net_device_stats));
|
|
|
|
if (!dev)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
|
|
|
|
|
|
|
if (!request_region(DE600_IO, 3, "de600")) {
|
|
|
|
printk(KERN_WARNING "DE600: port 0x%x busy\n", DE600_IO);
|
|
|
|
err = -EBUSY;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
printk(KERN_INFO "%s: D-Link DE-600 pocket adapter", dev->name);
|
|
|
|
/* Alpha testers must have the version number to report bugs. */
|
|
|
|
if (de600_debug > 1)
|
|
|
|
printk(version);
|
|
|
|
|
|
|
|
/* probe for adapter */
|
|
|
|
err = -ENODEV;
|
|
|
|
rx_page = 0;
|
|
|
|
select_nic();
|
|
|
|
(void)de600_read_status(dev);
|
|
|
|
de600_put_command(RESET);
|
|
|
|
de600_put_command(STOP_RESET);
|
|
|
|
if (de600_read_status(dev) & 0xf0) {
|
|
|
|
printk(": not at I/O %#3x.\n", DATA_PORT);
|
|
|
|
goto out1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Maybe we found one,
|
|
|
|
* have to check if it is a D-Link DE-600 adapter...
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* Get the adapter ethernet address from the ROM */
|
|
|
|
de600_setup_address(NODE_ADDRESS, RW_ADDR);
|
|
|
|
for (i = 0; i < ETH_ALEN; i++) {
|
|
|
|
dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
|
|
|
|
dev->broadcast[i] = 0xff;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check magic code */
|
|
|
|
if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
|
|
|
|
/* OK, install real address */
|
|
|
|
dev->dev_addr[0] = 0x00;
|
|
|
|
dev->dev_addr[1] = 0x80;
|
|
|
|
dev->dev_addr[2] = 0xc8;
|
|
|
|
dev->dev_addr[3] &= 0x0f;
|
|
|
|
dev->dev_addr[3] |= 0x70;
|
|
|
|
} else {
|
|
|
|
printk(" not identified in the printer port\n");
|
|
|
|
goto out1;
|
|
|
|
}
|
|
|
|
|
|
|
|
printk(", Ethernet Address: %02X", dev->dev_addr[0]);
|
|
|
|
for (i = 1; i < ETH_ALEN; i++)
|
|
|
|
printk(":%02X",dev->dev_addr[i]);
|
|
|
|
printk("\n");
|
|
|
|
|
|
|
|
dev->get_stats = get_stats;
|
|
|
|
|
|
|
|
dev->open = de600_open;
|
|
|
|
dev->stop = de600_close;
|
|
|
|
dev->hard_start_xmit = &de600_start_xmit;
|
|
|
|
|
|
|
|
dev->flags&=~IFF_MULTICAST;
|
|
|
|
|
|
|
|
select_prn();
|
|
|
|
|
|
|
|
err = register_netdev(dev);
|
|
|
|
if (err)
|
|
|
|
goto out1;
|
|
|
|
|
|
|
|
return dev;
|
|
|
|
|
|
|
|
out1:
|
|
|
|
release_region(DE600_IO, 3);
|
|
|
|
out:
|
|
|
|
free_netdev(dev);
|
|
|
|
return ERR_PTR(err);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int adapter_init(struct net_device *dev)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
select_nic();
|
|
|
|
rx_page = 0; /* used by RESET */
|
|
|
|
de600_put_command(RESET);
|
|
|
|
de600_put_command(STOP_RESET);
|
|
|
|
|
|
|
|
/* Check if it is still there... */
|
|
|
|
/* Get the some bytes of the adapter ethernet address from the ROM */
|
|
|
|
de600_setup_address(NODE_ADDRESS, RW_ADDR);
|
|
|
|
de600_read_byte(READ_DATA, dev);
|
|
|
|
if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
|
|
|
|
(de600_read_byte(READ_DATA, dev) != 0x15)) {
|
|
|
|
/* was: if (de600_read_status(dev) & 0xf0) { */
|
|
|
|
printk("Something has happened to the DE-600! Please check it and do a new ifconfig!\n");
|
|
|
|
/* Goodbye, cruel world... */
|
|
|
|
dev->flags &= ~IFF_UP;
|
|
|
|
de600_close(dev);
|
|
|
|
was_down = 1;
|
|
|
|
netif_stop_queue(dev); /* Transmit busy... */
|
|
|
|
return 1; /* failed */
|
|
|
|
}
|
|
|
|
|
|
|
|
if (was_down) {
|
|
|
|
printk(KERN_INFO "%s: Thanks, I feel much better now!\n", dev->name);
|
|
|
|
was_down = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
tx_fifo_in = 0;
|
|
|
|
tx_fifo_out = 0;
|
|
|
|
free_tx_pages = TX_PAGES;
|
|
|
|
|
|
|
|
|
|
|
|
/* set the ether address. */
|
|
|
|
de600_setup_address(NODE_ADDRESS, RW_ADDR);
|
|
|
|
for (i = 0; i < ETH_ALEN; i++)
|
|
|
|
de600_put_byte(dev->dev_addr[i]);
|
|
|
|
|
|
|
|
/* where to start saving incoming packets */
|
|
|
|
rx_page = RX_BP | RX_BASE_PAGE;
|
|
|
|
de600_setup_address(MEM_4K, RW_ADDR);
|
|
|
|
/* Enable receiver */
|
|
|
|
de600_put_command(RX_ENABLE);
|
|
|
|
select_prn();
|
|
|
|
|
|
|
|
netif_start_queue(dev);
|
|
|
|
|
|
|
|
return 0; /* OK */
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct net_device *de600_dev;
|
|
|
|
|
|
|
|
static int __init de600_init(void)
|
|
|
|
{
|
|
|
|
de600_dev = de600_probe();
|
|
|
|
if (IS_ERR(de600_dev))
|
|
|
|
return PTR_ERR(de600_dev);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit de600_exit(void)
|
|
|
|
{
|
|
|
|
unregister_netdev(de600_dev);
|
|
|
|
release_region(DE600_IO, 3);
|
|
|
|
free_netdev(de600_dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(de600_init);
|
|
|
|
module_exit(de600_exit);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|