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Diffstat (limited to 'drivers/net/isa-skeleton.c')
| -rw-r--r-- | drivers/net/isa-skeleton.c | 718 |
1 files changed, 0 insertions, 718 deletions
diff --git a/drivers/net/isa-skeleton.c b/drivers/net/isa-skeleton.c deleted file mode 100644 index 9e55c30..0000000 --- a/drivers/net/isa-skeleton.c +++ /dev/null @@ -1,718 +0,0 @@ -/* isa-skeleton.c: A network driver outline for linux. - * - * Written 1993-94 by Donald Becker. - * - * Copyright 1993 United States Government as represented by the - * Director, National Security Agency. - * - * This software may be used and distributed according to the terms - * of the GNU General Public License, incorporated herein by reference. - * - * The author may be reached as becker@scyld.com, or C/O - * Scyld Computing Corporation - * 410 Severn Ave., Suite 210 - * Annapolis MD 21403 - * - * This file is an outline for writing a network device driver for the - * the Linux operating system. - * - * To write (or understand) a driver, have a look at the "loopback.c" file to - * get a feel of what is going on, and then use the code below as a skeleton - * for the new driver. - * - */ - -static const char *version = - "isa-skeleton.c:v1.51 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n"; - -/* - * Sources: - * List your sources of programming information to document that - * the driver is your own creation, and give due credit to others - * that contributed to the work. Remember that GNU project code - * cannot use proprietary or trade secret information. Interface - * definitions are generally considered non-copyrightable to the - * extent that the same names and structures must be used to be - * compatible. - * - * Finally, keep in mind that the Linux kernel is has an API, not - * ABI. Proprietary object-code-only distributions are not permitted - * under the GPL. - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/types.h> -#include <linux/fcntl.h> -#include <linux/interrupt.h> -#include <linux/ioport.h> -#include <linux/in.h> -#include <linux/slab.h> -#include <linux/string.h> -#include <linux/spinlock.h> -#include <linux/errno.h> -#include <linux/init.h> -#include <linux/netdevice.h> -#include <linux/etherdevice.h> -#include <linux/skbuff.h> -#include <linux/bitops.h> - -#include <asm/system.h> -#include <asm/io.h> -#include <asm/dma.h> - -/* - * The name of the card. Is used for messages and in the requests for - * io regions, irqs and dma channels - */ -static const char* cardname = "netcard"; - -/* First, a few definitions that the brave might change. */ - -/* A zero-terminated list of I/O addresses to be probed. */ -static unsigned int netcard_portlist[] __initdata = - { 0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0}; - -/* use 0 for production, 1 for verification, >2 for debug */ -#ifndef NET_DEBUG -#define NET_DEBUG 2 -#endif -static unsigned int net_debug = NET_DEBUG; - -/* The number of low I/O ports used by the ethercard. */ -#define NETCARD_IO_EXTENT 32 - -#define MY_TX_TIMEOUT ((400*HZ)/1000) - -/* Information that need to be kept for each board. */ -struct net_local { - struct net_device_stats stats; - long open_time; /* Useless example local info. */ - - /* Tx control lock. This protects the transmit buffer ring - * state along with the "tx full" state of the driver. This - * means all netif_queue flow control actions are protected - * by this lock as well. - */ - spinlock_t lock; -}; - -/* The station (ethernet) address prefix, used for IDing the board. */ -#define SA_ADDR0 0x00 -#define SA_ADDR1 0x42 -#define SA_ADDR2 0x65 - -/* Index to functions, as function prototypes. */ - -static int netcard_probe1(struct net_device *dev, int ioaddr); -static int net_open(struct net_device *dev); -static int net_send_packet(struct sk_buff *skb, struct net_device *dev); -static irqreturn_t net_interrupt(int irq, void *dev_id); -static void net_rx(struct net_device *dev); -static int net_close(struct net_device *dev); -static struct net_device_stats *net_get_stats(struct net_device *dev); -static void set_multicast_list(struct net_device *dev); -static void net_tx_timeout(struct net_device *dev); - - -/* Example routines you must write ;->. */ -#define tx_done(dev) 1 -static void hardware_send_packet(short ioaddr, char *buf, int length); -static void chipset_init(struct net_device *dev, int startp); - -/* - * Check for a network adaptor of this type, and return '0' iff one exists. - * If dev->base_addr == 0, probe all likely locations. - * If dev->base_addr == 1, always return failure. - * If dev->base_addr == 2, allocate space for the device and return success - * (detachable devices only). - */ -static int __init do_netcard_probe(struct net_device *dev) -{ - int i; - int base_addr = dev->base_addr; - int irq = dev->irq; - - if (base_addr > 0x1ff) /* Check a single specified location. */ - return netcard_probe1(dev, base_addr); - else if (base_addr != 0) /* Don't probe at all. */ - return -ENXIO; - - for (i = 0; netcard_portlist[i]; i++) { - int ioaddr = netcard_portlist[i]; - if (netcard_probe1(dev, ioaddr) == 0) - return 0; - dev->irq = irq; - } - - return -ENODEV; -} - -static void cleanup_card(struct net_device *dev) -{ -#ifdef jumpered_dma - free_dma(dev->dma); -#endif -#ifdef jumpered_interrupts - free_irq(dev->irq, dev); -#endif - release_region(dev->base_addr, NETCARD_IO_EXTENT); -} - -#ifndef MODULE -struct net_device * __init netcard_probe(int unit) -{ - struct net_device *dev = alloc_etherdev(sizeof(struct net_local)); - int err; - - if (!dev) - return ERR_PTR(-ENOMEM); - - sprintf(dev->name, "eth%d", unit); - netdev_boot_setup_check(dev); - - err = do_netcard_probe(dev); - if (err) - goto out; - return dev; -out: - free_netdev(dev); - return ERR_PTR(err); -} -#endif - -static const struct net_device_ops netcard_netdev_ops = { - .ndo_open = net_open, - .ndo_stop = net_close, - .ndo_start_xmit = net_send_packet, - .ndo_get_stats = net_get_stats, - .ndo_set_multicast_list = set_multicast_list, - .ndo_tx_timeout = net_tx_timeout, - .ndo_validate_addr = eth_validate_addr, - .ndo_set_mac_address = eth_mac_addr, - .ndo_change_mtu = eth_change_mtu, -}; - -/* - * This is the real probe routine. Linux has a history of friendly device - * probes on the ISA bus. A good device probes avoids doing writes, and - * verifies that the correct device exists and functions. - */ -static int __init netcard_probe1(struct net_device *dev, int ioaddr) -{ - struct net_local *np; - static unsigned version_printed; - int i; - int err = -ENODEV; - - /* Grab the region so that no one else tries to probe our ioports. */ - if (!request_region(ioaddr, NETCARD_IO_EXTENT, cardname)) - return -EBUSY; - - /* - * For ethernet adaptors the first three octets of the station address - * contains the manufacturer's unique code. That might be a good probe - * method. Ideally you would add additional checks. - */ - if (inb(ioaddr + 0) != SA_ADDR0 || - inb(ioaddr + 1) != SA_ADDR1 || - inb(ioaddr + 2) != SA_ADDR2) - goto out; - - if (net_debug && version_printed++ == 0) - printk(KERN_DEBUG "%s", version); - - printk(KERN_INFO "%s: %s found at %#3x, ", dev->name, cardname, ioaddr); - - /* Fill in the 'dev' fields. */ - dev->base_addr = ioaddr; - - /* Retrieve and print the ethernet address. */ - for (i = 0; i < 6; i++) - dev->dev_addr[i] = inb(ioaddr + i); - - printk("%pM", dev->dev_addr); - - err = -EAGAIN; -#ifdef jumpered_interrupts - /* - * If this board has jumpered interrupts, allocate the interrupt - * vector now. There is no point in waiting since no other device - * can use the interrupt, and this marks the irq as busy. Jumpered - * interrupts are typically not reported by the boards, and we must - * used autoIRQ to find them. - */ - - if (dev->irq == -1) - ; /* Do nothing: a user-level program will set it. */ - else if (dev->irq < 2) { /* "Auto-IRQ" */ - unsigned long irq_mask = probe_irq_on(); - /* Trigger an interrupt here. */ - - dev->irq = probe_irq_off(irq_mask); - if (net_debug >= 2) - printk(" autoirq is %d", dev->irq); - } else if (dev->irq == 2) - /* - * Fixup for users that don't know that IRQ 2 is really - * IRQ9, or don't know which one to set. - */ - dev->irq = 9; - - { - int irqval = request_irq(dev->irq, net_interrupt, 0, cardname, dev); - if (irqval) { - printk("%s: unable to get IRQ %d (irqval=%d).\n", - dev->name, dev->irq, irqval); - goto out; - } - } -#endif /* jumpered interrupt */ -#ifdef jumpered_dma - /* - * If we use a jumpered DMA channel, that should be probed for and - * allocated here as well. See lance.c for an example. - */ - if (dev->dma == 0) { - if (request_dma(dev->dma, cardname)) { - printk("DMA %d allocation failed.\n", dev->dma); - goto out1; - } else - printk(", assigned DMA %d.\n", dev->dma); - } else { - short dma_status, new_dma_status; - - /* Read the DMA channel status registers. */ - dma_status = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) | - (inb(DMA2_STAT_REG) & 0xf0); - /* Trigger a DMA request, perhaps pause a bit. */ - outw(0x1234, ioaddr + 8); - /* Re-read the DMA status registers. */ - new_dma_status = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) | - (inb(DMA2_STAT_REG) & 0xf0); - /* - * Eliminate the old and floating requests, - * and DMA4 the cascade. - */ - new_dma_status ^= dma_status; - new_dma_status &= ~0x10; - for (i = 7; i > 0; i--) - if (test_bit(i, &new_dma_status)) { - dev->dma = i; - break; - } - if (i <= 0) { - printk("DMA probe failed.\n"); - goto out1; - } - if (request_dma(dev->dma, cardname)) { - printk("probed DMA %d allocation failed.\n", dev->dma); - goto out1; - } - } -#endif /* jumpered DMA */ - - np = netdev_priv(dev); - spin_lock_init(&np->lock); - - dev->netdev_ops = &netcard_netdev_ops; - dev->watchdog_timeo = MY_TX_TIMEOUT; - - err = register_netdev(dev); - if (err) - goto out2; - return 0; -out2: -#ifdef jumpered_dma - free_dma(dev->dma); -#endif -out1: -#ifdef jumpered_interrupts - free_irq(dev->irq, dev); -#endif -out: - release_region(base_addr, NETCARD_IO_EXTENT); - return err; -} - -static void net_tx_timeout(struct net_device *dev) -{ - struct net_local *np = netdev_priv(dev); - - printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, - tx_done(dev) ? "IRQ conflict" : "network cable problem"); - - /* Try to restart the adaptor. */ - chipset_init(dev, 1); - - np->stats.tx_errors++; - - /* If we have space available to accept new transmit - * requests, wake up the queueing layer. This would - * be the case if the chipset_init() call above just - * flushes out the tx queue and empties it. - * - * If instead, the tx queue is retained then the - * netif_wake_queue() call should be placed in the - * TX completion interrupt handler of the driver instead - * of here. - */ - if (!tx_full(dev)) - netif_wake_queue(dev); -} - -/* - * Open/initialize the board. This is called (in the current kernel) - * sometime after booting when the 'ifconfig' program is run. - * - * 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 non-reboot way to recover if something goes wrong. - */ -static int -net_open(struct net_device *dev) -{ - struct net_local *np = netdev_priv(dev); - int ioaddr = dev->base_addr; - /* - * This is used if the interrupt line can turned off (shared). - * See 3c503.c for an example of selecting the IRQ at config-time. - */ - if (request_irq(dev->irq, net_interrupt, 0, cardname, dev)) { - return -EAGAIN; - } - /* - * Always allocate the DMA channel after the IRQ, - * and clean up on failure. - */ - if (request_dma(dev->dma, cardname)) { - free_irq(dev->irq, dev); - return -EAGAIN; - } - - /* Reset the hardware here. Don't forget to set the station address. */ - chipset_init(dev, 1); - outb(0x00, ioaddr); - np->open_time = jiffies; - - /* We are now ready to accept transmit requeusts from - * the queueing layer of the networking. - */ - netif_start_queue(dev); - - return 0; -} - -/* This will only be invoked if your driver is _not_ in XOFF state. - * What this means is that you need not check it, and that this - * invariant will hold if you make sure that the netif_*_queue() - * calls are done at the proper times. - */ -static int net_send_packet(struct sk_buff *skb, struct net_device *dev) -{ - struct net_local *np = netdev_priv(dev); - int ioaddr = dev->base_addr; - short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN; - unsigned char *buf = skb->data; - - /* If some error occurs while trying to transmit this - * packet, you should return '1' from this function. - * In such a case you _may not_ do anything to the - * SKB, it is still owned by the network queueing - * layer when an error is returned. This means you - * may not modify any SKB fields, you may not free - * the SKB, etc. - */ - -#if TX_RING - /* This is the most common case for modern hardware. - * The spinlock protects this code from the TX complete - * hardware interrupt handler. Queue flow control is - * thus managed under this lock as well. - */ - unsigned long flags; - spin_lock_irqsave(&np->lock, flags); - - add_to_tx_ring(np, skb, length); - dev->trans_start = jiffies; - - /* If we just used up the very last entry in the - * TX ring on this device, tell the queueing - * layer to send no more. - */ - if (tx_full(dev)) - netif_stop_queue(dev); - - /* When the TX completion hw interrupt arrives, this - * is when the transmit statistics are updated. - */ - - spin_unlock_irqrestore(&np->lock, flags); -#else - /* This is the case for older hardware which takes - * a single transmit buffer at a time, and it is - * just written to the device via PIO. - * - * No spin locking is needed since there is no TX complete - * event. If by chance your card does have a TX complete - * hardware IRQ then you may need to utilize np->lock here. - */ - hardware_send_packet(ioaddr, buf, length); - np->stats.tx_bytes += skb->len; - - dev->trans_start = jiffies; - - /* You might need to clean up and record Tx statistics here. */ - if (inw(ioaddr) == /*RU*/81) - np->stats.tx_aborted_errors++; - dev_kfree_skb (skb); -#endif - - return NETDEV_TX_OK; -} - -#if TX_RING -/* This handles TX complete events posted by the device - * via interrupts. - */ -void net_tx(struct net_device *dev) -{ - struct net_local *np = netdev_priv(dev); - int entry; - - /* This protects us from concurrent execution of - * our dev->hard_start_xmit function above. - */ - spin_lock(&np->lock); - - entry = np->tx_old; - while (tx_entry_is_sent(np, entry)) { - struct sk_buff *skb = np->skbs[entry]; - - np->stats.tx_bytes += skb->len; - dev_kfree_skb_irq (skb); - - entry = next_tx_entry(np, entry); - } - np->tx_old = entry; - - /* If we had stopped the queue due to a "tx full" - * condition, and space has now been made available, - * wake up the queue. - */ - if (netif_queue_stopped(dev) && ! tx_full(dev)) - netif_wake_queue(dev); - - spin_unlock(&np->lock); -} -#endif - -/* - * The typical workload of the driver: - * Handle the network interface interrupts. - */ -static irqreturn_t net_interrupt(int irq, void *dev_id) -{ - struct net_device *dev = dev_id; - struct net_local *np; - int ioaddr, status; - int handled = 0; - - ioaddr = dev->base_addr; - - np = netdev_priv(dev); - status = inw(ioaddr + 0); - - if (status == 0) - goto out; - handled = 1; - - if (status & RX_INTR) { - /* Got a packet(s). */ - net_rx(dev); - } -#if TX_RING - if (status & TX_INTR) { - /* Transmit complete. */ - net_tx(dev); - np->stats.tx_packets++; - } -#endif - if (status & COUNTERS_INTR) { - /* Increment the appropriate 'localstats' field. */ - np->stats.tx_window_errors++; - } -out: - return IRQ_RETVAL(handled); -} - -/* We have a good packet(s), get it/them out of the buffers. */ -static void -net_rx(struct net_device *dev) -{ - struct net_local *lp = netdev_priv(dev); - int ioaddr = dev->base_addr; - int boguscount = 10; - - do { - int status = inw(ioaddr); - int pkt_len = inw(ioaddr); - - if (pkt_len == 0) /* Read all the frames? */ - break; /* Done for now */ - - if (status & 0x40) { /* There was an error. */ - lp->stats.rx_errors++; - if (status & 0x20) lp->stats.rx_frame_errors++; - if (status & 0x10) lp->stats.rx_over_errors++; - if (status & 0x08) lp->stats.rx_crc_errors++; - if (status & 0x04) lp->stats.rx_fifo_errors++; - } else { - /* Malloc up new buffer. */ - struct sk_buff *skb; - - lp->stats.rx_bytes+=pkt_len; - - skb = dev_alloc_skb(pkt_len); - if (skb == NULL) { - printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", - dev->name); - lp->stats.rx_dropped++; - break; - } - skb->dev = dev; - - /* 'skb->data' points to the start of sk_buff data area. */ - memcpy(skb_put(skb,pkt_len), (void*)dev->rmem_start, - pkt_len); - /* or */ - insw(ioaddr, skb->data, (pkt_len + 1) >> 1); - - netif_rx(skb); - lp->stats.rx_packets++; - lp->stats.rx_bytes += pkt_len; - } - } while (--boguscount); - - return; -} - -/* The inverse routine to net_open(). */ -static int -net_close(struct net_device *dev) -{ - struct net_local *lp = netdev_priv(dev); - int ioaddr = dev->base_addr; - - lp->open_time = 0; - - netif_stop_queue(dev); - - /* Flush the Tx and disable Rx here. */ - - disable_dma(dev->dma); - - /* If not IRQ or DMA jumpered, free up the line. */ - outw(0x00, ioaddr+0); /* Release the physical interrupt line. */ - - free_irq(dev->irq, dev); - free_dma(dev->dma); - - /* Update the statistics here. */ - - return 0; - -} - -/* - * Get the current statistics. - * This may be called with the card open or closed. - */ -static struct net_device_stats *net_get_stats(struct net_device *dev) -{ - struct net_local *lp = netdev_priv(dev); - short ioaddr = dev->base_addr; - - /* Update the statistics from the device registers. */ - lp->stats.rx_missed_errors = inw(ioaddr+1); - return &lp->stats; -} - -/* - * Set or clear the multicast filter for this adaptor. - * num_addrs == -1 Promiscuous mode, receive all packets - * num_addrs == 0 Normal mode, clear multicast list - * num_addrs > 0 Multicast mode, receive normal and MC packets, - * and do best-effort filtering. - */ -static void -set_multicast_list(struct net_device *dev) -{ - short ioaddr = dev->base_addr; - if (dev->flags&IFF_PROMISC) - { - /* Enable promiscuous mode */ - outw(MULTICAST|PROMISC, ioaddr); - } - else if ((dev->flags&IFF_ALLMULTI) || - netdev_mc_count(dev) > HW_MAX_ADDRS) - { - /* Disable promiscuous mode, use normal mode. */ - hardware_set_filter(NULL); - - outw(MULTICAST, ioaddr); - } - else if (!netdev_mc_empty(dev)) - { - /* Walk the address list, and load the filter */ - hardware_set_filter(dev); - - outw(MULTICAST, ioaddr); - } - else - outw(0, ioaddr); -} - -#ifdef MODULE - -static struct net_device *this_device; -static int io = 0x300; -static int irq; -static int dma; -static int mem; -MODULE_LICENSE("GPL"); - -int init_module(void) -{ - struct net_device *dev; - int result; - - if (io == 0) - printk(KERN_WARNING "%s: You shouldn't use auto-probing with insmod!\n", - cardname); - dev = alloc_etherdev(sizeof(struct net_local)); - if (!dev) - return -ENOMEM; - - /* Copy the parameters from insmod into the device structure. */ - dev->base_addr = io; - dev->irq = irq; - dev->dma = dma; - dev->mem_start = mem; - if (do_netcard_probe(dev) == 0) { - this_device = dev; - return 0; - } - free_netdev(dev); - return -ENXIO; -} - -void -cleanup_module(void) -{ - unregister_netdev(this_device); - cleanup_card(this_device); - free_netdev(this_device); -} - -#endif /* MODULE */ |