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 * (Now at ) * **************************************************************/ /* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "de600.h" static bool check_lost = true; 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 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(dev); if (tickssofar < HZ/20) 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");