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 | |
Alexander Beregalov | 9b6bfec | 2009-04-11 07:44:06 +0000 | [diff] [blame] | 184 | static const struct net_device_ops netcard_netdev_ops = { |
| 185 | .ndo_open = net_open, |
| 186 | .ndo_stop = net_close, |
| 187 | .ndo_start_xmit = net_send_packet, |
| 188 | .ndo_get_stats = net_get_stats, |
| 189 | .ndo_set_multicast_list = set_multicast_list, |
| 190 | .ndo_tx_timeout = net_tx_timeout, |
| 191 | .ndo_validate_addr = eth_validate_addr, |
| 192 | .ndo_set_mac_address = eth_mac_addr, |
| 193 | .ndo_change_mtu = eth_change_mtu, |
| 194 | }; |
| 195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | /* |
| 197 | * This is the real probe routine. Linux has a history of friendly device |
| 198 | * probes on the ISA bus. A good device probes avoids doing writes, and |
| 199 | * verifies that the correct device exists and functions. |
| 200 | */ |
| 201 | static int __init netcard_probe1(struct net_device *dev, int ioaddr) |
| 202 | { |
| 203 | struct net_local *np; |
| 204 | static unsigned version_printed; |
| 205 | int i; |
| 206 | int err = -ENODEV; |
| 207 | |
| 208 | /* Grab the region so that no one else tries to probe our ioports. */ |
| 209 | if (!request_region(ioaddr, NETCARD_IO_EXTENT, cardname)) |
| 210 | return -EBUSY; |
| 211 | |
| 212 | /* |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 213 | * For ethernet adaptors the first three octets of the station address |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | * contains the manufacturer's unique code. That might be a good probe |
| 215 | * method. Ideally you would add additional checks. |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 216 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | if (inb(ioaddr + 0) != SA_ADDR0 |
| 218 | || inb(ioaddr + 1) != SA_ADDR1 |
| 219 | || inb(ioaddr + 2) != SA_ADDR2) |
| 220 | goto out; |
| 221 | |
| 222 | if (net_debug && version_printed++ == 0) |
| 223 | printk(KERN_DEBUG "%s", version); |
| 224 | |
| 225 | printk(KERN_INFO "%s: %s found at %#3x, ", dev->name, cardname, ioaddr); |
| 226 | |
| 227 | /* Fill in the 'dev' fields. */ |
| 228 | dev->base_addr = ioaddr; |
| 229 | |
| 230 | /* Retrieve and print the ethernet address. */ |
| 231 | for (i = 0; i < 6; i++) |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 232 | dev->dev_addr[i] = inb(ioaddr + i); |
| 233 | |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 234 | printk("%pM", dev->dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
| 236 | err = -EAGAIN; |
| 237 | #ifdef jumpered_interrupts |
| 238 | /* |
| 239 | * If this board has jumpered interrupts, allocate the interrupt |
| 240 | * vector now. There is no point in waiting since no other device |
| 241 | * can use the interrupt, and this marks the irq as busy. Jumpered |
| 242 | * interrupts are typically not reported by the boards, and we must |
| 243 | * used autoIRQ to find them. |
| 244 | */ |
| 245 | |
| 246 | if (dev->irq == -1) |
| 247 | ; /* Do nothing: a user-level program will set it. */ |
| 248 | else if (dev->irq < 2) { /* "Auto-IRQ" */ |
| 249 | unsigned long irq_mask = probe_irq_on(); |
| 250 | /* Trigger an interrupt here. */ |
| 251 | |
| 252 | dev->irq = probe_irq_off(irq_mask); |
| 253 | if (net_debug >= 2) |
| 254 | printk(" autoirq is %d", dev->irq); |
| 255 | } else if (dev->irq == 2) |
| 256 | /* |
| 257 | * Fixup for users that don't know that IRQ 2 is really |
| 258 | * IRQ9, or don't know which one to set. |
| 259 | */ |
| 260 | dev->irq = 9; |
| 261 | |
| 262 | { |
| 263 | int irqval = request_irq(dev->irq, &net_interrupt, 0, cardname, dev); |
| 264 | if (irqval) { |
| 265 | printk("%s: unable to get IRQ %d (irqval=%d).\n", |
| 266 | dev->name, dev->irq, irqval); |
| 267 | goto out; |
| 268 | } |
| 269 | } |
| 270 | #endif /* jumpered interrupt */ |
| 271 | #ifdef jumpered_dma |
| 272 | /* |
| 273 | * If we use a jumpered DMA channel, that should be probed for and |
| 274 | * allocated here as well. See lance.c for an example. |
| 275 | */ |
| 276 | if (dev->dma == 0) { |
| 277 | if (request_dma(dev->dma, cardname)) { |
| 278 | printk("DMA %d allocation failed.\n", dev->dma); |
| 279 | goto out1; |
| 280 | } else |
| 281 | printk(", assigned DMA %d.\n", dev->dma); |
| 282 | } else { |
| 283 | short dma_status, new_dma_status; |
| 284 | |
| 285 | /* Read the DMA channel status registers. */ |
| 286 | dma_status = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) | |
| 287 | (inb(DMA2_STAT_REG) & 0xf0); |
| 288 | /* Trigger a DMA request, perhaps pause a bit. */ |
| 289 | outw(0x1234, ioaddr + 8); |
| 290 | /* Re-read the DMA status registers. */ |
| 291 | new_dma_status = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) | |
| 292 | (inb(DMA2_STAT_REG) & 0xf0); |
| 293 | /* |
| 294 | * Eliminate the old and floating requests, |
| 295 | * and DMA4 the cascade. |
| 296 | */ |
| 297 | new_dma_status ^= dma_status; |
| 298 | new_dma_status &= ~0x10; |
| 299 | for (i = 7; i > 0; i--) |
| 300 | if (test_bit(i, &new_dma_status)) { |
| 301 | dev->dma = i; |
| 302 | break; |
| 303 | } |
| 304 | if (i <= 0) { |
| 305 | printk("DMA probe failed.\n"); |
| 306 | goto out1; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 307 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | if (request_dma(dev->dma, cardname)) { |
| 309 | printk("probed DMA %d allocation failed.\n", dev->dma); |
| 310 | goto out1; |
| 311 | } |
| 312 | } |
| 313 | #endif /* jumpered DMA */ |
| 314 | |
| 315 | np = netdev_priv(dev); |
| 316 | spin_lock_init(&np->lock); |
| 317 | |
Alexander Beregalov | 9b6bfec | 2009-04-11 07:44:06 +0000 | [diff] [blame] | 318 | dev->netdev_ops = &netcard_netdev_ops; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 319 | dev->watchdog_timeo = MY_TX_TIMEOUT; |
| b1fc550 | 2005-05-12 20:11:55 -0400 | [diff] [blame] | 320 | |
| 321 | err = register_netdev(dev); |
| 322 | if (err) |
| 323 | goto out2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | return 0; |
| b1fc550 | 2005-05-12 20:11:55 -0400 | [diff] [blame] | 325 | out2: |
| 326 | #ifdef jumpered_dma |
| 327 | free_dma(dev->dma); |
| 328 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | out1: |
| 330 | #ifdef jumpered_interrupts |
| 331 | free_irq(dev->irq, dev); |
| 332 | #endif |
| 333 | out: |
| 334 | release_region(base_addr, NETCARD_IO_EXTENT); |
| 335 | return err; |
| 336 | } |
| 337 | |
| 338 | static void net_tx_timeout(struct net_device *dev) |
| 339 | { |
| 340 | struct net_local *np = netdev_priv(dev); |
| 341 | |
| 342 | printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, |
| 343 | tx_done(dev) ? "IRQ conflict" : "network cable problem"); |
| 344 | |
| 345 | /* Try to restart the adaptor. */ |
| 346 | chipset_init(dev, 1); |
| 347 | |
| 348 | np->stats.tx_errors++; |
| 349 | |
| 350 | /* If we have space available to accept new transmit |
| 351 | * requests, wake up the queueing layer. This would |
| 352 | * be the case if the chipset_init() call above just |
| 353 | * flushes out the tx queue and empties it. |
| 354 | * |
| 355 | * If instead, the tx queue is retained then the |
| 356 | * netif_wake_queue() call should be placed in the |
| 357 | * TX completion interrupt handler of the driver instead |
| 358 | * of here. |
| 359 | */ |
| 360 | if (!tx_full(dev)) |
| 361 | netif_wake_queue(dev); |
| 362 | } |
| 363 | |
| 364 | /* |
| 365 | * Open/initialize the board. This is called (in the current kernel) |
| 366 | * sometime after booting when the 'ifconfig' program is run. |
| 367 | * |
| 368 | * This routine should set everything up anew at each open, even |
| 369 | * registers that "should" only need to be set once at boot, so that |
| 370 | * there is non-reboot way to recover if something goes wrong. |
| 371 | */ |
| 372 | static int |
| 373 | net_open(struct net_device *dev) |
| 374 | { |
| 375 | struct net_local *np = netdev_priv(dev); |
| 376 | int ioaddr = dev->base_addr; |
| 377 | /* |
| 378 | * This is used if the interrupt line can turned off (shared). |
| 379 | * See 3c503.c for an example of selecting the IRQ at config-time. |
| 380 | */ |
| 381 | if (request_irq(dev->irq, &net_interrupt, 0, cardname, dev)) { |
| 382 | return -EAGAIN; |
| 383 | } |
| 384 | /* |
| 385 | * Always allocate the DMA channel after the IRQ, |
| 386 | * and clean up on failure. |
| 387 | */ |
| 388 | if (request_dma(dev->dma, cardname)) { |
| 389 | free_irq(dev->irq, dev); |
| 390 | return -EAGAIN; |
| 391 | } |
| 392 | |
| 393 | /* Reset the hardware here. Don't forget to set the station address. */ |
| 394 | chipset_init(dev, 1); |
| 395 | outb(0x00, ioaddr); |
| 396 | np->open_time = jiffies; |
| 397 | |
| 398 | /* We are now ready to accept transmit requeusts from |
| 399 | * the queueing layer of the networking. |
| 400 | */ |
| 401 | netif_start_queue(dev); |
| 402 | |
| 403 | return 0; |
| 404 | } |
| 405 | |
| 406 | /* This will only be invoked if your driver is _not_ in XOFF state. |
| 407 | * What this means is that you need not check it, and that this |
| 408 | * invariant will hold if you make sure that the netif_*_queue() |
| 409 | * calls are done at the proper times. |
| 410 | */ |
| 411 | static int net_send_packet(struct sk_buff *skb, struct net_device *dev) |
| 412 | { |
| 413 | struct net_local *np = netdev_priv(dev); |
| 414 | int ioaddr = dev->base_addr; |
| 415 | short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN; |
| 416 | unsigned char *buf = skb->data; |
| 417 | |
| 418 | /* If some error occurs while trying to transmit this |
| 419 | * packet, you should return '1' from this function. |
| 420 | * In such a case you _may not_ do anything to the |
| 421 | * SKB, it is still owned by the network queueing |
| 422 | * layer when an error is returned. This means you |
| 423 | * may not modify any SKB fields, you may not free |
| 424 | * the SKB, etc. |
| 425 | */ |
| 426 | |
| 427 | #if TX_RING |
| 428 | /* This is the most common case for modern hardware. |
| 429 | * The spinlock protects this code from the TX complete |
| 430 | * hardware interrupt handler. Queue flow control is |
| 431 | * thus managed under this lock as well. |
| 432 | */ |
Dongdong Deng | 79fbe13 | 2009-07-12 20:27:06 +0000 | [diff] [blame] | 433 | unsigned long flags; |
| 434 | spin_lock_irqsave(&np->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
| 436 | add_to_tx_ring(np, skb, length); |
| 437 | dev->trans_start = jiffies; |
| 438 | |
| 439 | /* If we just used up the very last entry in the |
| 440 | * TX ring on this device, tell the queueing |
| 441 | * layer to send no more. |
| 442 | */ |
| 443 | if (tx_full(dev)) |
| 444 | netif_stop_queue(dev); |
| 445 | |
| 446 | /* When the TX completion hw interrupt arrives, this |
| 447 | * is when the transmit statistics are updated. |
| 448 | */ |
| 449 | |
Dongdong Deng | 79fbe13 | 2009-07-12 20:27:06 +0000 | [diff] [blame] | 450 | spin_unlock_irqrestore(&np->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | #else |
| 452 | /* This is the case for older hardware which takes |
| 453 | * a single transmit buffer at a time, and it is |
| 454 | * just written to the device via PIO. |
| 455 | * |
| 456 | * No spin locking is needed since there is no TX complete |
| 457 | * event. If by chance your card does have a TX complete |
| 458 | * hardware IRQ then you may need to utilize np->lock here. |
| 459 | */ |
| 460 | hardware_send_packet(ioaddr, buf, length); |
| 461 | np->stats.tx_bytes += skb->len; |
| 462 | |
| 463 | dev->trans_start = jiffies; |
| 464 | |
| 465 | /* You might need to clean up and record Tx statistics here. */ |
| 466 | if (inw(ioaddr) == /*RU*/81) |
| 467 | np->stats.tx_aborted_errors++; |
| 468 | dev_kfree_skb (skb); |
| 469 | #endif |
| 470 | |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 471 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | } |
| 473 | |
| 474 | #if TX_RING |
| 475 | /* This handles TX complete events posted by the device |
| 476 | * via interrupts. |
| 477 | */ |
| 478 | void net_tx(struct net_device *dev) |
| 479 | { |
| 480 | struct net_local *np = netdev_priv(dev); |
| 481 | int entry; |
| 482 | |
| 483 | /* This protects us from concurrent execution of |
| 484 | * our dev->hard_start_xmit function above. |
| 485 | */ |
| 486 | spin_lock(&np->lock); |
| 487 | |
| 488 | entry = np->tx_old; |
| 489 | while (tx_entry_is_sent(np, entry)) { |
| 490 | struct sk_buff *skb = np->skbs[entry]; |
| 491 | |
| 492 | np->stats.tx_bytes += skb->len; |
| 493 | dev_kfree_skb_irq (skb); |
| 494 | |
| 495 | entry = next_tx_entry(np, entry); |
| 496 | } |
| 497 | np->tx_old = entry; |
| 498 | |
| 499 | /* If we had stopped the queue due to a "tx full" |
| 500 | * condition, and space has now been made available, |
| 501 | * wake up the queue. |
| 502 | */ |
| 503 | if (netif_queue_stopped(dev) && ! tx_full(dev)) |
| 504 | netif_wake_queue(dev); |
| 505 | |
| 506 | spin_unlock(&np->lock); |
| 507 | } |
| 508 | #endif |
| 509 | |
| 510 | /* |
| 511 | * The typical workload of the driver: |
| 512 | * Handle the network interface interrupts. |
| 513 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 514 | static irqreturn_t net_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | { |
| 516 | struct net_device *dev = dev_id; |
| 517 | struct net_local *np; |
| 518 | int ioaddr, status; |
| 519 | int handled = 0; |
| 520 | |
| 521 | ioaddr = dev->base_addr; |
| 522 | |
| 523 | np = netdev_priv(dev); |
| 524 | status = inw(ioaddr + 0); |
| 525 | |
| 526 | if (status == 0) |
| 527 | goto out; |
| 528 | handled = 1; |
| 529 | |
| 530 | if (status & RX_INTR) { |
| 531 | /* Got a packet(s). */ |
| 532 | net_rx(dev); |
| 533 | } |
| 534 | #if TX_RING |
| 535 | if (status & TX_INTR) { |
| 536 | /* Transmit complete. */ |
| 537 | net_tx(dev); |
| 538 | np->stats.tx_packets++; |
| 539 | netif_wake_queue(dev); |
| 540 | } |
| 541 | #endif |
| 542 | if (status & COUNTERS_INTR) { |
| 543 | /* Increment the appropriate 'localstats' field. */ |
| 544 | np->stats.tx_window_errors++; |
| 545 | } |
| 546 | out: |
| 547 | return IRQ_RETVAL(handled); |
| 548 | } |
| 549 | |
| 550 | /* We have a good packet(s), get it/them out of the buffers. */ |
| 551 | static void |
| 552 | net_rx(struct net_device *dev) |
| 553 | { |
| 554 | struct net_local *lp = netdev_priv(dev); |
| 555 | int ioaddr = dev->base_addr; |
| 556 | int boguscount = 10; |
| 557 | |
| 558 | do { |
| 559 | int status = inw(ioaddr); |
| 560 | int pkt_len = inw(ioaddr); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | if (pkt_len == 0) /* Read all the frames? */ |
| 563 | break; /* Done for now */ |
| 564 | |
| 565 | if (status & 0x40) { /* There was an error. */ |
| 566 | lp->stats.rx_errors++; |
| 567 | if (status & 0x20) lp->stats.rx_frame_errors++; |
| 568 | if (status & 0x10) lp->stats.rx_over_errors++; |
| 569 | if (status & 0x08) lp->stats.rx_crc_errors++; |
| 570 | if (status & 0x04) lp->stats.rx_fifo_errors++; |
| 571 | } else { |
| 572 | /* Malloc up new buffer. */ |
| 573 | struct sk_buff *skb; |
| 574 | |
| 575 | lp->stats.rx_bytes+=pkt_len; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 576 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | skb = dev_alloc_skb(pkt_len); |
| 578 | if (skb == NULL) { |
| 579 | printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", |
| 580 | dev->name); |
| 581 | lp->stats.rx_dropped++; |
| 582 | break; |
| 583 | } |
| 584 | skb->dev = dev; |
| 585 | |
| 586 | /* 'skb->data' points to the start of sk_buff data area. */ |
| 587 | memcpy(skb_put(skb,pkt_len), (void*)dev->rmem_start, |
| 588 | pkt_len); |
| 589 | /* or */ |
| 590 | insw(ioaddr, skb->data, (pkt_len + 1) >> 1); |
| 591 | |
| 592 | netif_rx(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | lp->stats.rx_packets++; |
| 594 | lp->stats.rx_bytes += pkt_len; |
| 595 | } |
| 596 | } while (--boguscount); |
| 597 | |
| 598 | return; |
| 599 | } |
| 600 | |
| 601 | /* The inverse routine to net_open(). */ |
| 602 | static int |
| 603 | net_close(struct net_device *dev) |
| 604 | { |
| 605 | struct net_local *lp = netdev_priv(dev); |
| 606 | int ioaddr = dev->base_addr; |
| 607 | |
| 608 | lp->open_time = 0; |
| 609 | |
| 610 | netif_stop_queue(dev); |
| 611 | |
| 612 | /* Flush the Tx and disable Rx here. */ |
| 613 | |
| 614 | disable_dma(dev->dma); |
| 615 | |
| 616 | /* If not IRQ or DMA jumpered, free up the line. */ |
| 617 | outw(0x00, ioaddr+0); /* Release the physical interrupt line. */ |
| 618 | |
| 619 | free_irq(dev->irq, dev); |
| 620 | free_dma(dev->dma); |
| 621 | |
| 622 | /* Update the statistics here. */ |
| 623 | |
| 624 | return 0; |
| 625 | |
| 626 | } |
| 627 | |
| 628 | /* |
| 629 | * Get the current statistics. |
| 630 | * This may be called with the card open or closed. |
| 631 | */ |
| 632 | static struct net_device_stats *net_get_stats(struct net_device *dev) |
| 633 | { |
| 634 | struct net_local *lp = netdev_priv(dev); |
| 635 | short ioaddr = dev->base_addr; |
| 636 | |
| 637 | /* Update the statistics from the device registers. */ |
| 638 | lp->stats.rx_missed_errors = inw(ioaddr+1); |
| 639 | return &lp->stats; |
| 640 | } |
| 641 | |
| 642 | /* |
| 643 | * Set or clear the multicast filter for this adaptor. |
| 644 | * num_addrs == -1 Promiscuous mode, receive all packets |
| 645 | * num_addrs == 0 Normal mode, clear multicast list |
| 646 | * num_addrs > 0 Multicast mode, receive normal and MC packets, |
| 647 | * and do best-effort filtering. |
| 648 | */ |
| 649 | static void |
| 650 | set_multicast_list(struct net_device *dev) |
| 651 | { |
| 652 | short ioaddr = dev->base_addr; |
| 653 | if (dev->flags&IFF_PROMISC) |
| 654 | { |
| 655 | /* Enable promiscuous mode */ |
| 656 | outw(MULTICAST|PROMISC, ioaddr); |
| 657 | } |
| 658 | else if((dev->flags&IFF_ALLMULTI) || dev->mc_count > HW_MAX_ADDRS) |
| 659 | { |
| 660 | /* Disable promiscuous mode, use normal mode. */ |
| 661 | hardware_set_filter(NULL); |
| 662 | |
| 663 | outw(MULTICAST, ioaddr); |
| 664 | } |
| 665 | else if(dev->mc_count) |
| 666 | { |
| 667 | /* Walk the address list, and load the filter */ |
| 668 | hardware_set_filter(dev->mc_list); |
| 669 | |
| 670 | outw(MULTICAST, ioaddr); |
| 671 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 672 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | outw(0, ioaddr); |
| 674 | } |
| 675 | |
| 676 | #ifdef MODULE |
| 677 | |
| 678 | static struct net_device *this_device; |
| 679 | static int io = 0x300; |
| 680 | static int irq; |
| 681 | static int dma; |
| 682 | static int mem; |
| 683 | MODULE_LICENSE("GPL"); |
| 684 | |
| 685 | int init_module(void) |
| 686 | { |
| 687 | struct net_device *dev; |
| 688 | int result; |
| 689 | |
| 690 | if (io == 0) |
| 691 | printk(KERN_WARNING "%s: You shouldn't use auto-probing with insmod!\n", |
| 692 | cardname); |
| 693 | dev = alloc_etherdev(sizeof(struct net_local)); |
| 694 | if (!dev) |
| 695 | return -ENOMEM; |
| 696 | |
| 697 | /* Copy the parameters from insmod into the device structure. */ |
| 698 | dev->base_addr = io; |
| 699 | dev->irq = irq; |
| 700 | dev->dma = dma; |
| 701 | dev->mem_start = mem; |
| 702 | if (do_netcard_probe(dev) == 0) { |
| b1fc550 | 2005-05-12 20:11:55 -0400 | [diff] [blame] | 703 | this_device = dev; |
| 704 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | } |
| 706 | free_netdev(dev); |
| 707 | return -ENXIO; |
| 708 | } |
| 709 | |
| 710 | void |
| 711 | cleanup_module(void) |
| 712 | { |
| 713 | unregister_netdev(this_device); |
| 714 | cleanup_card(this_device); |
| 715 | free_netdev(this_device); |
| 716 | } |
| 717 | |
| 718 | #endif /* MODULE */ |