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OpenCloudOS-Kernel/drivers/net/de600.c

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static const char version[] = "de600.c: $Revision: 1.41-2.5 $, Bjorn Ekwall (bj0rn@blox.se)\n";
/*
* de600.c
*
* Linux driver for the D-Link DE-600 Ethernet pocket adapter.
*
* Portions (C) Copyright 1993, 1994 by Bjorn Ekwall
* The Author may be reached as bj0rn@blox.se
*
* Based on adapter information gathered from DE600.ASM by D-Link Inc.,
* as included on disk C in the v.2.11 of PC/TCP from FTP Software.
* For DE600.asm:
* Portions (C) Copyright 1990 D-Link, Inc.
* Copyright, 1988-1992, Russell Nelson, Crynwr Software
*
* Adapted to the sample network driver core for linux,
* written by: Donald Becker <becker@super.org>
* (Now at <becker@scyld.com>)
*
**************************************************************/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
**************************************************************/
/* Add more time here if your adapter won't work OK: */
#define DE600_SLOW_DOWN udelay(delay_time)
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <asm/system.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <asm/io.h>
#include "de600.h"
static unsigned int check_lost = 1;
module_param(check_lost, bool, 0);
MODULE_PARM_DESC(check_lost, "If set then check for unplugged de600");
static unsigned int delay_time = 10;
module_param(delay_time, int, 0);
MODULE_PARM_DESC(delay_time, "DE-600 deley on I/O in microseconds");
/*
* D-Link driver variables:
*/
static volatile int rx_page;
#define TX_PAGES 2
static volatile int tx_fifo[TX_PAGES];
static volatile int tx_fifo_in;
static volatile int tx_fifo_out;
static volatile int free_tx_pages = TX_PAGES;
static int was_down;
static DEFINE_SPINLOCK(de600_lock);
static inline u8 de600_read_status(struct net_device *dev)
{
u8 status;
outb_p(STATUS, DATA_PORT);
status = inb(STATUS_PORT);
outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
return status;
}
static inline u8 de600_read_byte(unsigned char type, struct net_device *dev)
{
/* dev used by macros */
u8 lo;
outb_p((type), DATA_PORT);
lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
outb_p((type) | HI_NIBBLE, DATA_PORT);
return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
}
/*
* Open/initialize the board. This is called (in the current kernel)
* after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
*
* This routine should set everything up anew at each open, even
* registers that "should" only need to be set once at boot, so that
* there is a non-reboot way to recover if something goes wrong.
*/
static int de600_open(struct net_device *dev)
{
unsigned long flags;
int ret = request_irq(DE600_IRQ, de600_interrupt, 0, dev->name, dev);
if (ret) {
printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
return ret;
}
spin_lock_irqsave(&de600_lock, flags);
ret = adapter_init(dev);
spin_unlock_irqrestore(&de600_lock, flags);
return ret;
}
/*
* The inverse routine to de600_open().
*/
static int de600_close(struct net_device *dev)
{
select_nic();
rx_page = 0;
de600_put_command(RESET);
de600_put_command(STOP_RESET);
de600_put_command(0);
select_prn();
free_irq(DE600_IRQ, dev);
return 0;
}
static inline void trigger_interrupt(struct net_device *dev)
{
de600_put_command(FLIP_IRQ);
select_prn();
DE600_SLOW_DOWN;
select_nic();
de600_put_command(0);
}
/*
* Copy a buffer to the adapter transmit page memory.
* Start sending.
*/
static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
unsigned long flags;
int transmit_from;
int len;
int tickssofar;
u8 *buffer = skb->data;
int i;
if (free_tx_pages <= 0) { /* Do timeouts, to avoid hangs. */
tickssofar = jiffies - dev->trans_start;
if (tickssofar < 5)
return NETDEV_TX_BUSY;
/* else */
printk(KERN_WARNING "%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem");
/* Restart the adapter. */
spin_lock_irqsave(&de600_lock, flags);
if (adapter_init(dev)) {
spin_unlock_irqrestore(&de600_lock, flags);
return NETDEV_TX_BUSY;
}
spin_unlock_irqrestore(&de600_lock, flags);
}
/* Start real output */
pr_debug("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages);
if ((len = skb->len) < RUNT)
len = RUNT;
spin_lock_irqsave(&de600_lock, flags);
select_nic();
tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
if(check_lost)
{
/* This costs about 40 instructions per packet... */
de600_setup_address(NODE_ADDRESS, RW_ADDR);
de600_read_byte(READ_DATA, dev);
if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
if (adapter_init(dev)) {
spin_unlock_irqrestore(&de600_lock, flags);
return NETDEV_TX_BUSY;
}
}
}
de600_setup_address(transmit_from, RW_ADDR);
for (i = 0; i < skb->len ; ++i, ++buffer)
de600_put_byte(*buffer);
for (; i < len; ++i)
de600_put_byte(0);
if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
dev->trans_start = jiffies;
netif_start_queue(dev); /* allow more packets into adapter */
/* Send page and generate a faked interrupt */
de600_setup_address(transmit_from, TX_ADDR);
de600_put_command(TX_ENABLE);
}
else {
if (free_tx_pages)
netif_start_queue(dev);
else
netif_stop_queue(dev);
select_prn();
}
spin_unlock_irqrestore(&de600_lock, flags);
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
/*
* The typical workload of the driver:
* Handle the network interface interrupts.
*/
static irqreturn_t de600_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
u8 irq_status;
int retrig = 0;
int boguscount = 0;
spin_lock(&de600_lock);
select_nic();
irq_status = de600_read_status(dev);
do {
pr_debug("de600_interrupt (%02X)\n", irq_status);
if (irq_status & RX_GOOD)
de600_rx_intr(dev);
else if (!(irq_status & RX_BUSY))
de600_put_command(RX_ENABLE);
/* Any transmission in progress? */
if (free_tx_pages < TX_PAGES)
retrig = de600_tx_intr(dev, irq_status);
else
retrig = 0;
irq_status = de600_read_status(dev);
} while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
/*
* Yeah, it _looks_ like busy waiting, smells like busy waiting
* and I know it's not PC, but please, it will only occur once
* in a while and then only for a loop or so (< 1ms for sure!)
*/
/* Enable adapter interrupts */
select_prn();
if (retrig)
trigger_interrupt(dev);
spin_unlock(&de600_lock);
return IRQ_HANDLED;
}
static int de600_tx_intr(struct net_device *dev, int irq_status)
{
/*
* Returns 1 if tx still not done
*/
/* Check if current transmission is done yet */
if (irq_status & TX_BUSY)
return 1; /* tx not done, try again */
/* else */
/* If last transmission OK then bump fifo index */
if (!(irq_status & TX_FAILED16)) {
tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
++free_tx_pages;
dev->stats.tx_packets++;
netif_wake_queue(dev);
}
/* More to send, or resend last packet? */
if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
dev->trans_start = jiffies;
de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
de600_put_command(TX_ENABLE);
return 1;
}
/* else */
return 0;
}
/*
* We have a good packet, get it out of the adapter.
*/
static void de600_rx_intr(struct net_device *dev)
{
struct sk_buff *skb;
int i;
int read_from;
int size;
unsigned char *buffer;
/* Get size of received packet */
size = de600_read_byte(RX_LEN, dev); /* low byte */
size += (de600_read_byte(RX_LEN, dev) << 8); /* high byte */
size -= 4; /* Ignore trailing 4 CRC-bytes */
/* Tell adapter where to store next incoming packet, enable receiver */
read_from = rx_page_adr();
next_rx_page();
de600_put_command(RX_ENABLE);
if ((size < 32) || (size > 1535)) {
printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
if (size > 10000)
adapter_init(dev);
return;
}
skb = dev_alloc_skb(size+2);
if (skb == NULL) {
printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
return;
}
/* else */
skb_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->stats.rx_packets++; /* count all receives */
dev->stats.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 const struct net_device_ops de600_netdev_ops = {
.ndo_open = de600_open,
.ndo_stop = de600_close,
.ndo_start_xmit = de600_start_xmit,
.ndo_change_mtu = eth_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
};
static struct net_device * __init de600_probe(void)
{
int i;
struct net_device *dev;
int err;
dev = alloc_etherdev(0);
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. */
pr_debug("%s", 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: %pM\n", dev->dev_addr);
dev->netdev_ops = &de600_netdev_ops;
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");
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