Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* isa-skeleton.c: A network driver outline for linux. |
| 2 | * |
| 3 | * Written 1993-94 by Donald Becker. |
| 4 | * |
| 5 | * Copyright 1993 United States Government as represented by the |
| 6 | * Director, National Security Agency. |
| 7 | * |
| 8 | * This software may be used and distributed according to the terms |
| 9 | * of the GNU General Public License, incorporated herein by reference. |
| 10 | * |
| 11 | * The author may be reached as becker@scyld.com, or C/O |
| 12 | * Scyld Computing Corporation |
| 13 | * 410 Severn Ave., Suite 210 |
| 14 | * Annapolis MD 21403 |
| 15 | * |
| 16 | * This file is an outline for writing a network device driver for the |
| 17 | * the Linux operating system. |
| 18 | * |
| 19 | * To write (or understand) a driver, have a look at the "loopback.c" file to |
| 20 | * get a feel of what is going on, and then use the code below as a skeleton |
| 21 | * for the new driver. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | static const char *version = |
| 26 | "isa-skeleton.c:v1.51 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n"; |
| 27 | |
| 28 | /* |
| 29 | * Sources: |
| 30 | * List your sources of programming information to document that |
| 31 | * the driver is your own creation, and give due credit to others |
| 32 | * that contributed to the work. Remember that GNU project code |
| 33 | * cannot use proprietary or trade secret information. Interface |
| 34 | * definitions are generally considered non-copyrightable to the |
| 35 | * extent that the same names and structures must be used to be |
| 36 | * compatible. |
| 37 | * |
| 38 | * Finally, keep in mind that the Linux kernel is has an API, not |
| 39 | * ABI. Proprietary object-code-only distributions are not permitted |
| 40 | * under the GPL. |
| 41 | */ |
| 42 | |
| 43 | #include <linux/module.h> |
| 44 | #include <linux/kernel.h> |
| 45 | #include <linux/types.h> |
| 46 | #include <linux/fcntl.h> |
| 47 | #include <linux/interrupt.h> |
| 48 | #include <linux/ioport.h> |
| 49 | #include <linux/in.h> |
| 50 | #include <linux/slab.h> |
| 51 | #include <linux/string.h> |
| 52 | #include <linux/spinlock.h> |
| 53 | #include <linux/errno.h> |
| 54 | #include <linux/init.h> |
| 55 | #include <linux/netdevice.h> |
| 56 | #include <linux/etherdevice.h> |
| 57 | #include <linux/skbuff.h> |
| 58 | #include <linux/bitops.h> |
| 59 | |
| 60 | #include <asm/system.h> |
| 61 | #include <asm/io.h> |
| 62 | #include <asm/dma.h> |
| 63 | |
| 64 | /* |
| 65 | * The name of the card. Is used for messages and in the requests for |
| 66 | * io regions, irqs and dma channels |
| 67 | */ |
| 68 | static const char* cardname = "netcard"; |
| 69 | |
| 70 | /* First, a few definitions that the brave might change. */ |
| 71 | |
| 72 | /* A zero-terminated list of I/O addresses to be probed. */ |
| 73 | static unsigned int netcard_portlist[] __initdata = |
| 74 | { 0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0}; |
| 75 | |
| 76 | /* use 0 for production, 1 for verification, >2 for debug */ |
| 77 | #ifndef NET_DEBUG |
| 78 | #define NET_DEBUG 2 |
| 79 | #endif |
| 80 | static unsigned int net_debug = NET_DEBUG; |
| 81 | |
| 82 | /* The number of low I/O ports used by the ethercard. */ |
| 83 | #define NETCARD_IO_EXTENT 32 |
| 84 | |
| 85 | #define MY_TX_TIMEOUT ((400*HZ)/1000) |
| 86 | |
| 87 | /* Information that need to be kept for each board. */ |
| 88 | struct net_local { |
| 89 | struct net_device_stats stats; |
| 90 | long open_time; /* Useless example local info. */ |
| 91 | |
| 92 | /* Tx control lock. This protects the transmit buffer ring |
| 93 | * state along with the "tx full" state of the driver. This |
| 94 | * means all netif_queue flow control actions are protected |
| 95 | * by this lock as well. |
| 96 | */ |
| 97 | spinlock_t lock; |
| 98 | }; |
| 99 | |
| 100 | /* The station (ethernet) address prefix, used for IDing the board. */ |
| 101 | #define SA_ADDR0 0x00 |
| 102 | #define SA_ADDR1 0x42 |
| 103 | #define SA_ADDR2 0x65 |
| 104 | |
| 105 | /* Index to functions, as function prototypes. */ |
| 106 | |
| 107 | static int netcard_probe1(struct net_device *dev, int ioaddr); |
| 108 | static int net_open(struct net_device *dev); |
| 109 | static int net_send_packet(struct sk_buff *skb, struct net_device *dev); |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 110 | static irqreturn_t net_interrupt(int irq, void *dev_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | static void net_rx(struct net_device *dev); |
| 112 | static int net_close(struct net_device *dev); |
| 113 | static struct net_device_stats *net_get_stats(struct net_device *dev); |
| 114 | static void set_multicast_list(struct net_device *dev); |
| 115 | static void net_tx_timeout(struct net_device *dev); |
| 116 | |
| 117 | |
| 118 | /* Example routines you must write ;->. */ |
| 119 | #define tx_done(dev) 1 |
| 120 | static void hardware_send_packet(short ioaddr, char *buf, int length); |
| 121 | static void chipset_init(struct net_device *dev, int startp); |
| 122 | |
| 123 | /* |
| 124 | * Check for a network adaptor of this type, and return '0' iff one exists. |
| 125 | * If dev->base_addr == 0, probe all likely locations. |
| 126 | * If dev->base_addr == 1, always return failure. |
| 127 | * If dev->base_addr == 2, allocate space for the device and return success |
| 128 | * (detachable devices only). |
| 129 | */ |
| 130 | static int __init do_netcard_probe(struct net_device *dev) |
| 131 | { |
| 132 | int i; |
| 133 | int base_addr = dev->base_addr; |
| 134 | int irq = dev->irq; |
| 135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | if (base_addr > 0x1ff) /* Check a single specified location. */ |
| 137 | return netcard_probe1(dev, base_addr); |
| 138 | else if (base_addr != 0) /* Don't probe at all. */ |
| 139 | return -ENXIO; |
| 140 | |
| 141 | for (i = 0; netcard_portlist[i]; i++) { |
| 142 | int ioaddr = netcard_portlist[i]; |
| 143 | if (netcard_probe1(dev, ioaddr) == 0) |
| 144 | return 0; |
| 145 | dev->irq = irq; |
| 146 | } |
| 147 | |
| 148 | return -ENODEV; |
| 149 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | static void cleanup_card(struct net_device *dev) |
| 152 | { |
| 153 | #ifdef jumpered_dma |
| 154 | free_dma(dev->dma); |
| 155 | #endif |
| 156 | #ifdef jumpered_interrupts |
| 157 | free_irq(dev->irq, dev); |
| 158 | #endif |
| 159 | release_region(dev->base_addr, NETCARD_IO_EXTENT); |
| 160 | } |
| 161 | |
| 162 | #ifndef MODULE |
| 163 | struct net_device * __init netcard_probe(int unit) |
| 164 | { |
| 165 | struct net_device *dev = alloc_etherdev(sizeof(struct net_local)); |
| 166 | int err; |
| 167 | |
| 168 | if (!dev) |
| 169 | return ERR_PTR(-ENOMEM); |
| 170 | |
| 171 | sprintf(dev->name, "eth%d", unit); |
| 172 | netdev_boot_setup_check(dev); |
| 173 | |
| 174 | err = do_netcard_probe(dev); |
| 175 | if (err) |
| 176 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | return dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | out: |
| 179 | free_netdev(dev); |
| 180 | return ERR_PTR(err); |
| 181 | } |
| 182 | #endif |
| 183 | |
| 184 | /* |
| 185 | * This is the real probe routine. Linux has a history of friendly device |
| 186 | * probes on the ISA bus. A good device probes avoids doing writes, and |
| 187 | * verifies that the correct device exists and functions. |
| 188 | */ |
| 189 | static int __init netcard_probe1(struct net_device *dev, int ioaddr) |
| 190 | { |
| 191 | struct net_local *np; |
| 192 | static unsigned version_printed; |
| 193 | int i; |
| 194 | int err = -ENODEV; |
| 195 | |
| 196 | /* Grab the region so that no one else tries to probe our ioports. */ |
| 197 | if (!request_region(ioaddr, NETCARD_IO_EXTENT, cardname)) |
| 198 | return -EBUSY; |
| 199 | |
| 200 | /* |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 201 | * For ethernet adaptors the first three octets of the station address |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | * contains the manufacturer's unique code. That might be a good probe |
| 203 | * method. Ideally you would add additional checks. |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 204 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | if (inb(ioaddr + 0) != SA_ADDR0 |
| 206 | || inb(ioaddr + 1) != SA_ADDR1 |
| 207 | || inb(ioaddr + 2) != SA_ADDR2) |
| 208 | goto out; |
| 209 | |
| 210 | if (net_debug && version_printed++ == 0) |
| 211 | printk(KERN_DEBUG "%s", version); |
| 212 | |
| 213 | printk(KERN_INFO "%s: %s found at %#3x, ", dev->name, cardname, ioaddr); |
| 214 | |
| 215 | /* Fill in the 'dev' fields. */ |
| 216 | dev->base_addr = ioaddr; |
| 217 | |
| 218 | /* Retrieve and print the ethernet address. */ |
| 219 | for (i = 0; i < 6; i++) |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 220 | dev->dev_addr[i] = inb(ioaddr + i); |
| 221 | |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 222 | printk("%pM", dev->dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
| 224 | err = -EAGAIN; |
| 225 | #ifdef jumpered_interrupts |
| 226 | /* |
| 227 | * If this board has jumpered interrupts, allocate the interrupt |
| 228 | * vector now. There is no point in waiting since no other device |
| 229 | * can use the interrupt, and this marks the irq as busy. Jumpered |
| 230 | * interrupts are typically not reported by the boards, and we must |
| 231 | * used autoIRQ to find them. |
| 232 | */ |
| 233 | |
| 234 | if (dev->irq == -1) |
| 235 | ; /* Do nothing: a user-level program will set it. */ |
| 236 | else if (dev->irq < 2) { /* "Auto-IRQ" */ |
| 237 | unsigned long irq_mask = probe_irq_on(); |
| 238 | /* Trigger an interrupt here. */ |
| 239 | |
| 240 | dev->irq = probe_irq_off(irq_mask); |
| 241 | if (net_debug >= 2) |
| 242 | printk(" autoirq is %d", dev->irq); |
| 243 | } else if (dev->irq == 2) |
| 244 | /* |
| 245 | * Fixup for users that don't know that IRQ 2 is really |
| 246 | * IRQ9, or don't know which one to set. |
| 247 | */ |
| 248 | dev->irq = 9; |
| 249 | |
| 250 | { |
| 251 | int irqval = request_irq(dev->irq, &net_interrupt, 0, cardname, dev); |
| 252 | if (irqval) { |
| 253 | printk("%s: unable to get IRQ %d (irqval=%d).\n", |
| 254 | dev->name, dev->irq, irqval); |
| 255 | goto out; |
| 256 | } |
| 257 | } |
| 258 | #endif /* jumpered interrupt */ |
| 259 | #ifdef jumpered_dma |
| 260 | /* |
| 261 | * If we use a jumpered DMA channel, that should be probed for and |
| 262 | * allocated here as well. See lance.c for an example. |
| 263 | */ |
| 264 | if (dev->dma == 0) { |
| 265 | if (request_dma(dev->dma, cardname)) { |
| 266 | printk("DMA %d allocation failed.\n", dev->dma); |
| 267 | goto out1; |
| 268 | } else |
| 269 | printk(", assigned DMA %d.\n", dev->dma); |
| 270 | } else { |
| 271 | short dma_status, new_dma_status; |
| 272 | |
| 273 | /* Read the DMA channel status registers. */ |
| 274 | dma_status = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) | |
| 275 | (inb(DMA2_STAT_REG) & 0xf0); |
| 276 | /* Trigger a DMA request, perhaps pause a bit. */ |
| 277 | outw(0x1234, ioaddr + 8); |
| 278 | /* Re-read the DMA status registers. */ |
| 279 | new_dma_status = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) | |
| 280 | (inb(DMA2_STAT_REG) & 0xf0); |
| 281 | /* |
| 282 | * Eliminate the old and floating requests, |
| 283 | * and DMA4 the cascade. |
| 284 | */ |
| 285 | new_dma_status ^= dma_status; |
| 286 | new_dma_status &= ~0x10; |
| 287 | for (i = 7; i > 0; i--) |
| 288 | if (test_bit(i, &new_dma_status)) { |
| 289 | dev->dma = i; |
| 290 | break; |
| 291 | } |
| 292 | if (i <= 0) { |
| 293 | printk("DMA probe failed.\n"); |
| 294 | goto out1; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 295 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | if (request_dma(dev->dma, cardname)) { |
| 297 | printk("probed DMA %d allocation failed.\n", dev->dma); |
| 298 | goto out1; |
| 299 | } |
| 300 | } |
| 301 | #endif /* jumpered DMA */ |
| 302 | |
| 303 | np = netdev_priv(dev); |
| 304 | spin_lock_init(&np->lock); |
| 305 | |
| 306 | dev->open = net_open; |
| 307 | dev->stop = net_close; |
| 308 | dev->hard_start_xmit = net_send_packet; |
| 309 | dev->get_stats = net_get_stats; |
| 310 | dev->set_multicast_list = &set_multicast_list; |
| 311 | |
| 312 | dev->tx_timeout = &net_tx_timeout; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 313 | dev->watchdog_timeo = MY_TX_TIMEOUT; |
| b1fc550 | 2005-05-12 20:11:55 -0400 | [diff] [blame] | 314 | |
| 315 | err = register_netdev(dev); |
| 316 | if (err) |
| 317 | goto out2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | return 0; |
| b1fc550 | 2005-05-12 20:11:55 -0400 | [diff] [blame] | 319 | out2: |
| 320 | #ifdef jumpered_dma |
| 321 | free_dma(dev->dma); |
| 322 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | out1: |
| 324 | #ifdef jumpered_interrupts |
| 325 | free_irq(dev->irq, dev); |
| 326 | #endif |
| 327 | out: |
| 328 | release_region(base_addr, NETCARD_IO_EXTENT); |
| 329 | return err; |
| 330 | } |
| 331 | |
| 332 | static void net_tx_timeout(struct net_device *dev) |
| 333 | { |
| 334 | struct net_local *np = netdev_priv(dev); |
| 335 | |
| 336 | printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, |
| 337 | tx_done(dev) ? "IRQ conflict" : "network cable problem"); |
| 338 | |
| 339 | /* Try to restart the adaptor. */ |
| 340 | chipset_init(dev, 1); |
| 341 | |
| 342 | np->stats.tx_errors++; |
| 343 | |
| 344 | /* If we have space available to accept new transmit |
| 345 | * requests, wake up the queueing layer. This would |
| 346 | * be the case if the chipset_init() call above just |
| 347 | * flushes out the tx queue and empties it. |
| 348 | * |
| 349 | * If instead, the tx queue is retained then the |
| 350 | * netif_wake_queue() call should be placed in the |
| 351 | * TX completion interrupt handler of the driver instead |
| 352 | * of here. |
| 353 | */ |
| 354 | if (!tx_full(dev)) |
| 355 | netif_wake_queue(dev); |
| 356 | } |
| 357 | |
| 358 | /* |
| 359 | * Open/initialize the board. This is called (in the current kernel) |
| 360 | * sometime after booting when the 'ifconfig' program is run. |
| 361 | * |
| 362 | * This routine should set everything up anew at each open, even |
| 363 | * registers that "should" only need to be set once at boot, so that |
| 364 | * there is non-reboot way to recover if something goes wrong. |
| 365 | */ |
| 366 | static int |
| 367 | net_open(struct net_device *dev) |
| 368 | { |
| 369 | struct net_local *np = netdev_priv(dev); |
| 370 | int ioaddr = dev->base_addr; |
| 371 | /* |
| 372 | * This is used if the interrupt line can turned off (shared). |
| 373 | * See 3c503.c for an example of selecting the IRQ at config-time. |
| 374 | */ |
| 375 | if (request_irq(dev->irq, &net_interrupt, 0, cardname, dev)) { |
| 376 | return -EAGAIN; |
| 377 | } |
| 378 | /* |
| 379 | * Always allocate the DMA channel after the IRQ, |
| 380 | * and clean up on failure. |
| 381 | */ |
| 382 | if (request_dma(dev->dma, cardname)) { |
| 383 | free_irq(dev->irq, dev); |
| 384 | return -EAGAIN; |
| 385 | } |
| 386 | |
| 387 | /* Reset the hardware here. Don't forget to set the station address. */ |
| 388 | chipset_init(dev, 1); |
| 389 | outb(0x00, ioaddr); |
| 390 | np->open_time = jiffies; |
| 391 | |
| 392 | /* We are now ready to accept transmit requeusts from |
| 393 | * the queueing layer of the networking. |
| 394 | */ |
| 395 | netif_start_queue(dev); |
| 396 | |
| 397 | return 0; |
| 398 | } |
| 399 | |
| 400 | /* This will only be invoked if your driver is _not_ in XOFF state. |
| 401 | * What this means is that you need not check it, and that this |
| 402 | * invariant will hold if you make sure that the netif_*_queue() |
| 403 | * calls are done at the proper times. |
| 404 | */ |
| 405 | static int net_send_packet(struct sk_buff *skb, struct net_device *dev) |
| 406 | { |
| 407 | struct net_local *np = netdev_priv(dev); |
| 408 | int ioaddr = dev->base_addr; |
| 409 | short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN; |
| 410 | unsigned char *buf = skb->data; |
| 411 | |
| 412 | /* If some error occurs while trying to transmit this |
| 413 | * packet, you should return '1' from this function. |
| 414 | * In such a case you _may not_ do anything to the |
| 415 | * SKB, it is still owned by the network queueing |
| 416 | * layer when an error is returned. This means you |
| 417 | * may not modify any SKB fields, you may not free |
| 418 | * the SKB, etc. |
| 419 | */ |
| 420 | |
| 421 | #if TX_RING |
| 422 | /* This is the most common case for modern hardware. |
| 423 | * The spinlock protects this code from the TX complete |
| 424 | * hardware interrupt handler. Queue flow control is |
| 425 | * thus managed under this lock as well. |
| 426 | */ |
| 427 | spin_lock_irq(&np->lock); |
| 428 | |
| 429 | add_to_tx_ring(np, skb, length); |
| 430 | dev->trans_start = jiffies; |
| 431 | |
| 432 | /* If we just used up the very last entry in the |
| 433 | * TX ring on this device, tell the queueing |
| 434 | * layer to send no more. |
| 435 | */ |
| 436 | if (tx_full(dev)) |
| 437 | netif_stop_queue(dev); |
| 438 | |
| 439 | /* When the TX completion hw interrupt arrives, this |
| 440 | * is when the transmit statistics are updated. |
| 441 | */ |
| 442 | |
| 443 | spin_unlock_irq(&np->lock); |
| 444 | #else |
| 445 | /* This is the case for older hardware which takes |
| 446 | * a single transmit buffer at a time, and it is |
| 447 | * just written to the device via PIO. |
| 448 | * |
| 449 | * No spin locking is needed since there is no TX complete |
| 450 | * event. If by chance your card does have a TX complete |
| 451 | * hardware IRQ then you may need to utilize np->lock here. |
| 452 | */ |
| 453 | hardware_send_packet(ioaddr, buf, length); |
| 454 | np->stats.tx_bytes += skb->len; |
| 455 | |
| 456 | dev->trans_start = jiffies; |
| 457 | |
| 458 | /* You might need to clean up and record Tx statistics here. */ |
| 459 | if (inw(ioaddr) == /*RU*/81) |
| 460 | np->stats.tx_aborted_errors++; |
| 461 | dev_kfree_skb (skb); |
| 462 | #endif |
| 463 | |
| 464 | return 0; |
| 465 | } |
| 466 | |
| 467 | #if TX_RING |
| 468 | /* This handles TX complete events posted by the device |
| 469 | * via interrupts. |
| 470 | */ |
| 471 | void net_tx(struct net_device *dev) |
| 472 | { |
| 473 | struct net_local *np = netdev_priv(dev); |
| 474 | int entry; |
| 475 | |
| 476 | /* This protects us from concurrent execution of |
| 477 | * our dev->hard_start_xmit function above. |
| 478 | */ |
| 479 | spin_lock(&np->lock); |
| 480 | |
| 481 | entry = np->tx_old; |
| 482 | while (tx_entry_is_sent(np, entry)) { |
| 483 | struct sk_buff *skb = np->skbs[entry]; |
| 484 | |
| 485 | np->stats.tx_bytes += skb->len; |
| 486 | dev_kfree_skb_irq (skb); |
| 487 | |
| 488 | entry = next_tx_entry(np, entry); |
| 489 | } |
| 490 | np->tx_old = entry; |
| 491 | |
| 492 | /* If we had stopped the queue due to a "tx full" |
| 493 | * condition, and space has now been made available, |
| 494 | * wake up the queue. |
| 495 | */ |
| 496 | if (netif_queue_stopped(dev) && ! tx_full(dev)) |
| 497 | netif_wake_queue(dev); |
| 498 | |
| 499 | spin_unlock(&np->lock); |
| 500 | } |
| 501 | #endif |
| 502 | |
| 503 | /* |
| 504 | * The typical workload of the driver: |
| 505 | * Handle the network interface interrupts. |
| 506 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 507 | static irqreturn_t net_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | { |
| 509 | struct net_device *dev = dev_id; |
| 510 | struct net_local *np; |
| 511 | int ioaddr, status; |
| 512 | int handled = 0; |
| 513 | |
| 514 | ioaddr = dev->base_addr; |
| 515 | |
| 516 | np = netdev_priv(dev); |
| 517 | status = inw(ioaddr + 0); |
| 518 | |
| 519 | if (status == 0) |
| 520 | goto out; |
| 521 | handled = 1; |
| 522 | |
| 523 | if (status & RX_INTR) { |
| 524 | /* Got a packet(s). */ |
| 525 | net_rx(dev); |
| 526 | } |
| 527 | #if TX_RING |
| 528 | if (status & TX_INTR) { |
| 529 | /* Transmit complete. */ |
| 530 | net_tx(dev); |
| 531 | np->stats.tx_packets++; |
| 532 | netif_wake_queue(dev); |
| 533 | } |
| 534 | #endif |
| 535 | if (status & COUNTERS_INTR) { |
| 536 | /* Increment the appropriate 'localstats' field. */ |
| 537 | np->stats.tx_window_errors++; |
| 538 | } |
| 539 | out: |
| 540 | return IRQ_RETVAL(handled); |
| 541 | } |
| 542 | |
| 543 | /* We have a good packet(s), get it/them out of the buffers. */ |
| 544 | static void |
| 545 | net_rx(struct net_device *dev) |
| 546 | { |
| 547 | struct net_local *lp = netdev_priv(dev); |
| 548 | int ioaddr = dev->base_addr; |
| 549 | int boguscount = 10; |
| 550 | |
| 551 | do { |
| 552 | int status = inw(ioaddr); |
| 553 | int pkt_len = inw(ioaddr); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 554 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | if (pkt_len == 0) /* Read all the frames? */ |
| 556 | break; /* Done for now */ |
| 557 | |
| 558 | if (status & 0x40) { /* There was an error. */ |
| 559 | lp->stats.rx_errors++; |
| 560 | if (status & 0x20) lp->stats.rx_frame_errors++; |
| 561 | if (status & 0x10) lp->stats.rx_over_errors++; |
| 562 | if (status & 0x08) lp->stats.rx_crc_errors++; |
| 563 | if (status & 0x04) lp->stats.rx_fifo_errors++; |
| 564 | } else { |
| 565 | /* Malloc up new buffer. */ |
| 566 | struct sk_buff *skb; |
| 567 | |
| 568 | lp->stats.rx_bytes+=pkt_len; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 569 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | skb = dev_alloc_skb(pkt_len); |
| 571 | if (skb == NULL) { |
| 572 | printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", |
| 573 | dev->name); |
| 574 | lp->stats.rx_dropped++; |
| 575 | break; |
| 576 | } |
| 577 | skb->dev = dev; |
| 578 | |
| 579 | /* 'skb->data' points to the start of sk_buff data area. */ |
| 580 | memcpy(skb_put(skb,pkt_len), (void*)dev->rmem_start, |
| 581 | pkt_len); |
| 582 | /* or */ |
| 583 | insw(ioaddr, skb->data, (pkt_len + 1) >> 1); |
| 584 | |
| 585 | netif_rx(skb); |
| 586 | dev->last_rx = jiffies; |
| 587 | lp->stats.rx_packets++; |
| 588 | lp->stats.rx_bytes += pkt_len; |
| 589 | } |
| 590 | } while (--boguscount); |
| 591 | |
| 592 | return; |
| 593 | } |
| 594 | |
| 595 | /* The inverse routine to net_open(). */ |
| 596 | static int |
| 597 | net_close(struct net_device *dev) |
| 598 | { |
| 599 | struct net_local *lp = netdev_priv(dev); |
| 600 | int ioaddr = dev->base_addr; |
| 601 | |
| 602 | lp->open_time = 0; |
| 603 | |
| 604 | netif_stop_queue(dev); |
| 605 | |
| 606 | /* Flush the Tx and disable Rx here. */ |
| 607 | |
| 608 | disable_dma(dev->dma); |
| 609 | |
| 610 | /* If not IRQ or DMA jumpered, free up the line. */ |
| 611 | outw(0x00, ioaddr+0); /* Release the physical interrupt line. */ |
| 612 | |
| 613 | free_irq(dev->irq, dev); |
| 614 | free_dma(dev->dma); |
| 615 | |
| 616 | /* Update the statistics here. */ |
| 617 | |
| 618 | return 0; |
| 619 | |
| 620 | } |
| 621 | |
| 622 | /* |
| 623 | * Get the current statistics. |
| 624 | * This may be called with the card open or closed. |
| 625 | */ |
| 626 | static struct net_device_stats *net_get_stats(struct net_device *dev) |
| 627 | { |
| 628 | struct net_local *lp = netdev_priv(dev); |
| 629 | short ioaddr = dev->base_addr; |
| 630 | |
| 631 | /* Update the statistics from the device registers. */ |
| 632 | lp->stats.rx_missed_errors = inw(ioaddr+1); |
| 633 | return &lp->stats; |
| 634 | } |
| 635 | |
| 636 | /* |
| 637 | * Set or clear the multicast filter for this adaptor. |
| 638 | * num_addrs == -1 Promiscuous mode, receive all packets |
| 639 | * num_addrs == 0 Normal mode, clear multicast list |
| 640 | * num_addrs > 0 Multicast mode, receive normal and MC packets, |
| 641 | * and do best-effort filtering. |
| 642 | */ |
| 643 | static void |
| 644 | set_multicast_list(struct net_device *dev) |
| 645 | { |
| 646 | short ioaddr = dev->base_addr; |
| 647 | if (dev->flags&IFF_PROMISC) |
| 648 | { |
| 649 | /* Enable promiscuous mode */ |
| 650 | outw(MULTICAST|PROMISC, ioaddr); |
| 651 | } |
| 652 | else if((dev->flags&IFF_ALLMULTI) || dev->mc_count > HW_MAX_ADDRS) |
| 653 | { |
| 654 | /* Disable promiscuous mode, use normal mode. */ |
| 655 | hardware_set_filter(NULL); |
| 656 | |
| 657 | outw(MULTICAST, ioaddr); |
| 658 | } |
| 659 | else if(dev->mc_count) |
| 660 | { |
| 661 | /* Walk the address list, and load the filter */ |
| 662 | hardware_set_filter(dev->mc_list); |
| 663 | |
| 664 | outw(MULTICAST, ioaddr); |
| 665 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 666 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | outw(0, ioaddr); |
| 668 | } |
| 669 | |
| 670 | #ifdef MODULE |
| 671 | |
| 672 | static struct net_device *this_device; |
| 673 | static int io = 0x300; |
| 674 | static int irq; |
| 675 | static int dma; |
| 676 | static int mem; |
| 677 | MODULE_LICENSE("GPL"); |
| 678 | |
| 679 | int init_module(void) |
| 680 | { |
| 681 | struct net_device *dev; |
| 682 | int result; |
| 683 | |
| 684 | if (io == 0) |
| 685 | printk(KERN_WARNING "%s: You shouldn't use auto-probing with insmod!\n", |
| 686 | cardname); |
| 687 | dev = alloc_etherdev(sizeof(struct net_local)); |
| 688 | if (!dev) |
| 689 | return -ENOMEM; |
| 690 | |
| 691 | /* Copy the parameters from insmod into the device structure. */ |
| 692 | dev->base_addr = io; |
| 693 | dev->irq = irq; |
| 694 | dev->dma = dma; |
| 695 | dev->mem_start = mem; |
| 696 | if (do_netcard_probe(dev) == 0) { |
| b1fc550 | 2005-05-12 20:11:55 -0400 | [diff] [blame] | 697 | this_device = dev; |
| 698 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | } |
| 700 | free_netdev(dev); |
| 701 | return -ENXIO; |
| 702 | } |
| 703 | |
| 704 | void |
| 705 | cleanup_module(void) |
| 706 | { |
| 707 | unregister_netdev(this_device); |
| 708 | cleanup_card(this_device); |
| 709 | free_netdev(this_device); |
| 710 | } |
| 711 | |
| 712 | #endif /* MODULE */ |
| 713 | |
| 714 | /* |
| 715 | * Local variables: |
| 716 | * compile-command: |
| 717 | * gcc -D__KERNEL__ -Wall -Wstrict-prototypes -Wwrite-strings |
| 718 | * -Wredundant-decls -O2 -m486 -c skeleton.c |
| 719 | * version-control: t |
| 720 | * kept-new-versions: 5 |
| 721 | * tab-width: 4 |
| 722 | * c-indent-level: 4 |
| 723 | * End: |
| 724 | */ |