Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* znet.c: An Zenith Z-Note ethernet driver for linux. */ |
| 2 | |
| 3 | /* |
| 4 | Written by Donald Becker. |
| 5 | |
| 6 | The author may be reached as becker@scyld.com. |
| 7 | This driver is based on the Linux skeleton driver. The copyright of the |
| 8 | skeleton driver is held by the United States Government, as represented |
| 9 | by DIRNSA, and it is released under the GPL. |
| 10 | |
| 11 | Thanks to Mike Hollick for alpha testing and suggestions. |
| 12 | |
| 13 | References: |
| 14 | The Crynwr packet driver. |
| 15 | |
| 16 | "82593 CSMA/CD Core LAN Controller" Intel datasheet, 1992 |
| 17 | Intel Microcommunications Databook, Vol. 1, 1990. |
| 18 | As usual with Intel, the documentation is incomplete and inaccurate. |
| 19 | I had to read the Crynwr packet driver to figure out how to actually |
| 20 | use the i82593, and guess at what register bits matched the loosely |
| 21 | related i82586. |
| 22 | |
| 23 | Theory of Operation |
| 24 | |
| 25 | The i82593 used in the Zenith Z-Note series operates using two(!) slave |
| 26 | DMA channels, one interrupt, and one 8-bit I/O port. |
| 27 | |
| 28 | While there several ways to configure '593 DMA system, I chose the one |
| 29 | that seemed commensurate with the highest system performance in the face |
| 30 | of moderate interrupt latency: Both DMA channels are configured as |
| 31 | recirculating ring buffers, with one channel (#0) dedicated to Rx and |
| 32 | the other channel (#1) to Tx and configuration. (Note that this is |
| 33 | different than the Crynwr driver, where the Tx DMA channel is initialized |
| 34 | before each operation. That approach simplifies operation and Tx error |
| 35 | recovery, but requires additional I/O in normal operation and precludes |
| 36 | transmit buffer chaining.) |
| 37 | |
| 38 | Both rings are set to 8192 bytes using {TX,RX}_RING_SIZE. This provides |
| 39 | a reasonable ring size for Rx, while simplifying DMA buffer allocation -- |
| 40 | DMA buffers must not cross a 128K boundary. (In truth the size selection |
| 41 | was influenced by my lack of '593 documentation. I thus was constrained |
| 42 | to use the Crynwr '593 initialization table, which sets the Rx ring size |
| 43 | to 8K.) |
| 44 | |
| 45 | Despite my usual low opinion about Intel-designed parts, I must admit |
| 46 | that the bulk data handling of the i82593 is a good design for |
| 47 | an integrated system, like a laptop, where using two slave DMA channels |
| 48 | doesn't pose a problem. I still take issue with using only a single I/O |
| 49 | port. In the same controlled environment there are essentially no |
| 50 | limitations on I/O space, and using multiple locations would eliminate |
| 51 | the need for multiple operations when looking at status registers, |
| 52 | setting the Rx ring boundary, or switching to promiscuous mode. |
| 53 | |
| 54 | I also question Zenith's selection of the '593: one of the advertised |
| 55 | advantages of earlier Intel parts was that if you figured out the magic |
| 56 | initialization incantation you could use the same part on many different |
| 57 | network types. Zenith's use of the "FriendlyNet" (sic) connector rather |
| 58 | than an on-board transceiver leads me to believe that they were planning |
| 59 | to take advantage of this. But, uhmmm, the '593 omits all but ethernet |
| 60 | functionality from the serial subsystem. |
| 61 | */ |
| 62 | |
| 63 | /* 10/2002 |
| 64 | |
| 65 | o Resurected for Linux 2.5+ by Marc Zyngier <maz@wild-wind.fr.eu.org> : |
| 66 | |
| 67 | - Removed strange DMA snooping in znet_sent_packet, which lead to |
| 68 | TX buffer corruption on my laptop. |
| 69 | - Use init_etherdev stuff. |
| 70 | - Use kmalloc-ed DMA buffers. |
| 71 | - Use as few global variables as possible. |
| 72 | - Use proper resources management. |
| 73 | - Use wireless/i82593.h as much as possible (structure, constants) |
| 74 | - Compiles as module or build-in. |
| 75 | - Now survives unplugging/replugging cable. |
| 76 | |
| 77 | Some code was taken from wavelan_cs. |
| 78 | |
| 79 | Tested on a vintage Zenith Z-Note 433Lnp+. Probably broken on |
| 80 | anything else. Testers (and detailed bug reports) are welcome :-). |
| 81 | |
| 82 | o TODO : |
| 83 | |
| 84 | - Properly handle multicast |
| 85 | - Understand why some traffic patterns add a 1s latency... |
| 86 | */ |
| 87 | |
| 88 | #include <linux/config.h> |
| 89 | #include <linux/module.h> |
| 90 | #include <linux/kernel.h> |
| 91 | #include <linux/string.h> |
| 92 | #include <linux/errno.h> |
| 93 | #include <linux/interrupt.h> |
| 94 | #include <linux/ioport.h> |
| 95 | #include <linux/init.h> |
| 96 | #include <linux/delay.h> |
| 97 | #include <linux/netdevice.h> |
| 98 | #include <linux/etherdevice.h> |
| 99 | #include <linux/skbuff.h> |
| 100 | #include <linux/if_arp.h> |
| 101 | #include <linux/bitops.h> |
| 102 | |
| 103 | #include <asm/system.h> |
| 104 | #include <asm/io.h> |
| 105 | #include <asm/dma.h> |
| 106 | |
| 107 | /* This include could be elsewhere, since it is not wireless specific */ |
| 108 | #include "wireless/i82593.h" |
| 109 | |
| 110 | static char version[] __initdata = "znet.c:v1.02 9/23/94 becker@scyld.com\n"; |
| 111 | |
| 112 | #ifndef ZNET_DEBUG |
| 113 | #define ZNET_DEBUG 1 |
| 114 | #endif |
| 115 | static unsigned int znet_debug = ZNET_DEBUG; |
| 116 | module_param (znet_debug, int, 0); |
| 117 | MODULE_PARM_DESC (znet_debug, "ZNet debug level"); |
| 118 | MODULE_LICENSE("GPL"); |
| 119 | |
| 120 | /* The DMA modes we need aren't in <dma.h>. */ |
| 121 | #define DMA_RX_MODE 0x14 /* Auto init, I/O to mem, ++, demand. */ |
| 122 | #define DMA_TX_MODE 0x18 /* Auto init, Mem to I/O, ++, demand. */ |
| 123 | #define dma_page_eq(ptr1, ptr2) ((long)(ptr1)>>17 == (long)(ptr2)>>17) |
| 124 | #define RX_BUF_SIZE 8192 |
| 125 | #define TX_BUF_SIZE 8192 |
| 126 | #define DMA_BUF_SIZE (RX_BUF_SIZE + 16) /* 8k + 16 bytes for trailers */ |
| 127 | |
| 128 | #define TX_TIMEOUT 10 |
| 129 | |
| 130 | struct znet_private { |
| 131 | int rx_dma, tx_dma; |
| 132 | struct net_device_stats stats; |
| 133 | spinlock_t lock; |
| 134 | short sia_base, sia_size, io_size; |
| 135 | struct i82593_conf_block i593_init; |
| 136 | /* The starting, current, and end pointers for the packet buffers. */ |
| 137 | ushort *rx_start, *rx_cur, *rx_end; |
| 138 | ushort *tx_start, *tx_cur, *tx_end; |
| 139 | ushort tx_buf_len; /* Tx buffer length, in words. */ |
| 140 | }; |
| 141 | |
| 142 | /* Only one can be built-in;-> */ |
| 143 | static struct net_device *znet_dev; |
| 144 | |
| 145 | struct netidblk { |
| 146 | char magic[8]; /* The magic number (string) "NETIDBLK" */ |
| 147 | unsigned char netid[8]; /* The physical station address */ |
| 148 | char nettype, globalopt; |
| 149 | char vendor[8]; /* The machine vendor and product name. */ |
| 150 | char product[8]; |
| 151 | char irq1, irq2; /* Interrupts, only one is currently used. */ |
| 152 | char dma1, dma2; |
| 153 | short dma_mem_misc[8]; /* DMA buffer locations (unused in Linux). */ |
| 154 | short iobase1, iosize1; |
| 155 | short iobase2, iosize2; /* Second iobase unused. */ |
| 156 | char driver_options; /* Misc. bits */ |
| 157 | char pad; |
| 158 | }; |
| 159 | |
| 160 | static int znet_open(struct net_device *dev); |
| 161 | static int znet_send_packet(struct sk_buff *skb, struct net_device *dev); |
| 162 | static irqreturn_t znet_interrupt(int irq, void *dev_id, struct pt_regs *regs); |
| 163 | static void znet_rx(struct net_device *dev); |
| 164 | static int znet_close(struct net_device *dev); |
| 165 | static struct net_device_stats *net_get_stats(struct net_device *dev); |
| 166 | static void hardware_init(struct net_device *dev); |
| 167 | static void update_stop_hit(short ioaddr, unsigned short rx_stop_offset); |
| 168 | static void znet_tx_timeout (struct net_device *dev); |
| 169 | |
| 170 | /* Request needed resources */ |
| 171 | static int znet_request_resources (struct net_device *dev) |
| 172 | { |
| 173 | struct znet_private *znet = dev->priv; |
| 174 | unsigned long flags; |
| 175 | |
| 176 | if (request_irq (dev->irq, &znet_interrupt, 0, "ZNet", dev)) |
| 177 | goto failed; |
| 178 | if (request_dma (znet->rx_dma, "ZNet rx")) |
| 179 | goto free_irq; |
| 180 | if (request_dma (znet->tx_dma, "ZNet tx")) |
| 181 | goto free_rx_dma; |
| 182 | if (!request_region (znet->sia_base, znet->sia_size, "ZNet SIA")) |
| 183 | goto free_tx_dma; |
| 184 | if (!request_region (dev->base_addr, znet->io_size, "ZNet I/O")) |
| 185 | goto free_sia; |
| 186 | |
| 187 | return 0; /* Happy ! */ |
| 188 | |
| 189 | free_sia: |
| 190 | release_region (znet->sia_base, znet->sia_size); |
| 191 | free_tx_dma: |
| 192 | flags = claim_dma_lock(); |
| 193 | free_dma (znet->tx_dma); |
| 194 | release_dma_lock (flags); |
| 195 | free_rx_dma: |
| 196 | flags = claim_dma_lock(); |
| 197 | free_dma (znet->rx_dma); |
| 198 | release_dma_lock (flags); |
| 199 | free_irq: |
| 200 | free_irq (dev->irq, dev); |
| 201 | failed: |
| 202 | return -1; |
| 203 | } |
| 204 | |
| 205 | static void znet_release_resources (struct net_device *dev) |
| 206 | { |
| 207 | struct znet_private *znet = dev->priv; |
| 208 | unsigned long flags; |
| 209 | |
| 210 | release_region (znet->sia_base, znet->sia_size); |
| 211 | release_region (dev->base_addr, znet->io_size); |
| 212 | flags = claim_dma_lock(); |
| 213 | free_dma (znet->tx_dma); |
| 214 | free_dma (znet->rx_dma); |
| 215 | release_dma_lock (flags); |
| 216 | free_irq (dev->irq, dev); |
| 217 | } |
| 218 | |
| 219 | /* Keep the magical SIA stuff in a single function... */ |
| 220 | static void znet_transceiver_power (struct net_device *dev, int on) |
| 221 | { |
| 222 | struct znet_private *znet = dev->priv; |
| 223 | unsigned char v; |
| 224 | |
| 225 | /* Turn on/off the 82501 SIA, using zenith-specific magic. */ |
| 226 | /* Select LAN control register */ |
| 227 | outb(0x10, znet->sia_base); |
| 228 | |
| 229 | if (on) |
| 230 | v = inb(znet->sia_base + 1) | 0x84; |
| 231 | else |
| 232 | v = inb(znet->sia_base + 1) & ~0x84; |
| 233 | |
| 234 | outb(v, znet->sia_base+1); /* Turn on/off LAN power (bit 2). */ |
| 235 | } |
| 236 | |
| 237 | /* Init the i82593, with current promisc/mcast configuration. |
| 238 | Also used from hardware_init. */ |
| 239 | static void znet_set_multicast_list (struct net_device *dev) |
| 240 | { |
| 241 | struct znet_private *znet = dev->priv; |
| 242 | short ioaddr = dev->base_addr; |
| 243 | struct i82593_conf_block *cfblk = &znet->i593_init; |
| 244 | |
| 245 | memset(cfblk, 0x00, sizeof(struct i82593_conf_block)); |
| 246 | |
| 247 | /* The configuration block. What an undocumented nightmare. |
| 248 | The first set of values are those suggested (without explanation) |
| 249 | for ethernet in the Intel 82586 databook. The rest appear to be |
| 250 | completely undocumented, except for cryptic notes in the Crynwr |
| 251 | packet driver. This driver uses the Crynwr values verbatim. */ |
| 252 | |
| 253 | /* maz : Rewritten to take advantage of the wanvelan includes. |
| 254 | At least we have names, not just blind values */ |
| 255 | |
| 256 | /* Byte 0 */ |
| 257 | cfblk->fifo_limit = 10; /* = 16 B rx and 80 B tx fifo thresholds */ |
| 258 | cfblk->forgnesi = 0; /* 0=82C501, 1=AMD7992B compatibility */ |
| 259 | cfblk->fifo_32 = 1; |
| 260 | cfblk->d6mod = 0; /* Run in i82593 advanced mode */ |
| 261 | cfblk->throttle_enb = 1; |
| 262 | |
| 263 | /* Byte 1 */ |
| 264 | cfblk->throttle = 8; /* Continuous w/interrupts, 128-clock DMA. */ |
| 265 | cfblk->cntrxint = 0; /* enable continuous mode receive interrupts */ |
| 266 | cfblk->contin = 1; /* enable continuous mode */ |
| 267 | |
| 268 | /* Byte 2 */ |
| 269 | cfblk->addr_len = ETH_ALEN; |
| 270 | cfblk->acloc = 1; /* Disable source addr insertion by i82593 */ |
| 271 | cfblk->preamb_len = 2; /* 8 bytes preamble */ |
| 272 | cfblk->loopback = 0; /* Loopback off */ |
| 273 | |
| 274 | /* Byte 3 */ |
| 275 | cfblk->lin_prio = 0; /* Default priorities & backoff methods. */ |
| 276 | cfblk->tbofstop = 0; |
| 277 | cfblk->exp_prio = 0; |
| 278 | cfblk->bof_met = 0; |
| 279 | |
| 280 | /* Byte 4 */ |
| 281 | cfblk->ifrm_spc = 6; /* 96 bit times interframe spacing */ |
| 282 | |
| 283 | /* Byte 5 */ |
| 284 | cfblk->slottim_low = 0; /* 512 bit times slot time (low) */ |
| 285 | |
| 286 | /* Byte 6 */ |
| 287 | cfblk->slottim_hi = 2; /* 512 bit times slot time (high) */ |
| 288 | cfblk->max_retr = 15; /* 15 collisions retries */ |
| 289 | |
| 290 | /* Byte 7 */ |
| 291 | cfblk->prmisc = ((dev->flags & IFF_PROMISC) ? 1 : 0); /* Promiscuous mode */ |
| 292 | cfblk->bc_dis = 0; /* Enable broadcast reception */ |
| 293 | cfblk->crs_1 = 0; /* Don't transmit without carrier sense */ |
| 294 | cfblk->nocrc_ins = 0; /* i82593 generates CRC */ |
| 295 | cfblk->crc_1632 = 0; /* 32-bit Autodin-II CRC */ |
| 296 | cfblk->crs_cdt = 0; /* CD not to be interpreted as CS */ |
| 297 | |
| 298 | /* Byte 8 */ |
| 299 | cfblk->cs_filter = 0; /* CS is recognized immediately */ |
| 300 | cfblk->crs_src = 0; /* External carrier sense */ |
| 301 | cfblk->cd_filter = 0; /* CD is recognized immediately */ |
| 302 | |
| 303 | /* Byte 9 */ |
| 304 | cfblk->min_fr_len = ETH_ZLEN >> 2; /* Minimum frame length */ |
| 305 | |
| 306 | /* Byte A */ |
| 307 | cfblk->lng_typ = 1; /* Type/length checks OFF */ |
| 308 | cfblk->lng_fld = 1; /* Disable 802.3 length field check */ |
| 309 | cfblk->rxcrc_xf = 1; /* Don't transfer CRC to memory */ |
| 310 | cfblk->artx = 1; /* Disable automatic retransmission */ |
| 311 | cfblk->sarec = 1; /* Disable source addr trig of CD */ |
| 312 | cfblk->tx_jabber = 0; /* Disable jabber jam sequence */ |
| 313 | cfblk->hash_1 = 1; /* Use bits 0-5 in mc address hash */ |
| 314 | cfblk->lbpkpol = 0; /* Loopback pin active high */ |
| 315 | |
| 316 | /* Byte B */ |
| 317 | cfblk->fdx = 0; /* Disable full duplex operation */ |
| 318 | |
| 319 | /* Byte C */ |
| 320 | cfblk->dummy_6 = 0x3f; /* all ones, Default multicast addresses & backoff. */ |
| 321 | cfblk->mult_ia = 0; /* No multiple individual addresses */ |
| 322 | cfblk->dis_bof = 0; /* Disable the backoff algorithm ?! */ |
| 323 | |
| 324 | /* Byte D */ |
| 325 | cfblk->dummy_1 = 1; /* set to 1 */ |
| 326 | cfblk->tx_ifs_retrig = 3; /* Hmm... Disabled */ |
| 327 | cfblk->mc_all = (dev->mc_list || (dev->flags&IFF_ALLMULTI));/* multicast all mode */ |
| 328 | cfblk->rcv_mon = 0; /* Monitor mode disabled */ |
| 329 | cfblk->frag_acpt = 0; /* Do not accept fragments */ |
| 330 | cfblk->tstrttrs = 0; /* No start transmission threshold */ |
| 331 | |
| 332 | /* Byte E */ |
| 333 | cfblk->fretx = 1; /* FIFO automatic retransmission */ |
| 334 | cfblk->runt_eop = 0; /* drop "runt" packets */ |
| 335 | cfblk->hw_sw_pin = 0; /* ?? */ |
| 336 | cfblk->big_endn = 0; /* Big Endian ? no... */ |
| 337 | cfblk->syncrqs = 1; /* Synchronous DRQ deassertion... */ |
| 338 | cfblk->sttlen = 1; /* 6 byte status registers */ |
| 339 | cfblk->rx_eop = 0; /* Signal EOP on packet reception */ |
| 340 | cfblk->tx_eop = 0; /* Signal EOP on packet transmission */ |
| 341 | |
| 342 | /* Byte F */ |
| 343 | cfblk->rbuf_size = RX_BUF_SIZE >> 12; /* Set receive buffer size */ |
| 344 | cfblk->rcvstop = 1; /* Enable Receive Stop Register */ |
| 345 | |
| 346 | if (znet_debug > 2) { |
| 347 | int i; |
| 348 | unsigned char *c; |
| 349 | |
| 350 | for (i = 0, c = (char *) cfblk; i < sizeof (*cfblk); i++) |
| 351 | printk ("%02X ", c[i]); |
| 352 | printk ("\n"); |
| 353 | } |
| 354 | |
| 355 | *znet->tx_cur++ = sizeof(struct i82593_conf_block); |
| 356 | memcpy(znet->tx_cur, cfblk, sizeof(struct i82593_conf_block)); |
| 357 | znet->tx_cur += sizeof(struct i82593_conf_block)/2; |
| 358 | outb(OP0_CONFIGURE | CR0_CHNL, ioaddr); |
| 359 | |
| 360 | /* XXX FIXME maz : Add multicast addresses here, so having a |
| 361 | * multicast address configured isn't equal to IFF_ALLMULTI */ |
| 362 | } |
| 363 | |
| 364 | /* The Z-Note probe is pretty easy. The NETIDBLK exists in the safe-to-probe |
| 365 | BIOS area. We just scan for the signature, and pull the vital parameters |
| 366 | out of the structure. */ |
| 367 | |
| 368 | static int __init znet_probe (void) |
| 369 | { |
| 370 | int i; |
| 371 | struct netidblk *netinfo; |
| 372 | struct znet_private *znet; |
| 373 | struct net_device *dev; |
| 374 | char *p; |
| 375 | int err = -ENOMEM; |
| 376 | |
| 377 | /* This code scans the region 0xf0000 to 0xfffff for a "NETIDBLK". */ |
| 378 | for(p = (char *)phys_to_virt(0xf0000); p < (char *)phys_to_virt(0x100000); p++) |
| 379 | if (*p == 'N' && strncmp(p, "NETIDBLK", 8) == 0) |
| 380 | break; |
| 381 | |
| 382 | if (p >= (char *)phys_to_virt(0x100000)) { |
| 383 | if (znet_debug > 1) |
| 384 | printk(KERN_INFO "No Z-Note ethernet adaptor found.\n"); |
| 385 | return -ENODEV; |
| 386 | } |
| 387 | |
| 388 | dev = alloc_etherdev(sizeof(struct znet_private)); |
| 389 | if (!dev) |
| 390 | return -ENOMEM; |
| 391 | |
| 392 | SET_MODULE_OWNER (dev); |
| 393 | |
| 394 | znet = dev->priv; |
| 395 | |
| 396 | netinfo = (struct netidblk *)p; |
| 397 | dev->base_addr = netinfo->iobase1; |
| 398 | dev->irq = netinfo->irq1; |
| 399 | |
| 400 | printk(KERN_INFO "%s: ZNET at %#3lx,", dev->name, dev->base_addr); |
| 401 | |
| 402 | /* The station address is in the "netidblk" at 0x0f0000. */ |
| 403 | for (i = 0; i < 6; i++) |
| 404 | printk(" %2.2x", dev->dev_addr[i] = netinfo->netid[i]); |
| 405 | |
| 406 | printk(", using IRQ %d DMA %d and %d.\n", dev->irq, netinfo->dma1, |
| 407 | netinfo->dma2); |
| 408 | |
| 409 | if (znet_debug > 1) { |
| 410 | printk(KERN_INFO "%s: vendor '%16.16s' IRQ1 %d IRQ2 %d DMA1 %d DMA2 %d.\n", |
| 411 | dev->name, netinfo->vendor, |
| 412 | netinfo->irq1, netinfo->irq2, |
| 413 | netinfo->dma1, netinfo->dma2); |
| 414 | printk(KERN_INFO "%s: iobase1 %#x size %d iobase2 %#x size %d net type %2.2x.\n", |
| 415 | dev->name, netinfo->iobase1, netinfo->iosize1, |
| 416 | netinfo->iobase2, netinfo->iosize2, netinfo->nettype); |
| 417 | } |
| 418 | |
| 419 | if (znet_debug > 0) |
| 420 | printk(KERN_INFO "%s", version); |
| 421 | |
| 422 | znet->rx_dma = netinfo->dma1; |
| 423 | znet->tx_dma = netinfo->dma2; |
| 424 | spin_lock_init(&znet->lock); |
| 425 | znet->sia_base = 0xe6; /* Magic address for the 82501 SIA */ |
| 426 | znet->sia_size = 2; |
| 427 | /* maz: Despite the '593 being advertised above as using a |
| 428 | * single 8bits I/O port, this driver does many 16bits |
| 429 | * access. So set io_size accordingly */ |
| 430 | znet->io_size = 2; |
| 431 | |
| 432 | if (!(znet->rx_start = kmalloc (DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA))) |
| 433 | goto free_dev; |
| 434 | if (!(znet->tx_start = kmalloc (DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA))) |
| 435 | goto free_rx; |
| 436 | |
| 437 | if (!dma_page_eq (znet->rx_start, znet->rx_start + (RX_BUF_SIZE/2-1)) || |
| 438 | !dma_page_eq (znet->tx_start, znet->tx_start + (TX_BUF_SIZE/2-1))) { |
| 439 | printk (KERN_WARNING "tx/rx crossing DMA frontiers, giving up\n"); |
| 440 | goto free_tx; |
| 441 | } |
| 442 | |
| 443 | znet->rx_end = znet->rx_start + RX_BUF_SIZE/2; |
| 444 | znet->tx_buf_len = TX_BUF_SIZE/2; |
| 445 | znet->tx_end = znet->tx_start + znet->tx_buf_len; |
| 446 | |
| 447 | /* The ZNET-specific entries in the device structure. */ |
| 448 | dev->open = &znet_open; |
| 449 | dev->hard_start_xmit = &znet_send_packet; |
| 450 | dev->stop = &znet_close; |
| 451 | dev->get_stats = net_get_stats; |
| 452 | dev->set_multicast_list = &znet_set_multicast_list; |
| 453 | dev->tx_timeout = znet_tx_timeout; |
| 454 | dev->watchdog_timeo = TX_TIMEOUT; |
| 455 | err = register_netdev(dev); |
| 456 | if (err) |
| 457 | goto free_tx; |
| 458 | znet_dev = dev; |
| 459 | return 0; |
| 460 | |
| 461 | free_tx: |
| 462 | kfree(znet->tx_start); |
| 463 | free_rx: |
| 464 | kfree(znet->rx_start); |
| 465 | free_dev: |
| 466 | free_netdev(dev); |
| 467 | return err; |
| 468 | } |
| 469 | |
| 470 | |
| 471 | static int znet_open(struct net_device *dev) |
| 472 | { |
| 473 | int ioaddr = dev->base_addr; |
| 474 | |
| 475 | if (znet_debug > 2) |
| 476 | printk(KERN_DEBUG "%s: znet_open() called.\n", dev->name); |
| 477 | |
| 478 | /* These should never fail. You can't add devices to a sealed box! */ |
| 479 | if (znet_request_resources (dev)) { |
| 480 | printk(KERN_WARNING "%s: Not opened -- resource busy?!?\n", dev->name); |
| 481 | return -EBUSY; |
| 482 | } |
| 483 | |
| 484 | znet_transceiver_power (dev, 1); |
| 485 | |
| 486 | /* According to the Crynwr driver we should wait 50 msec. for the |
| 487 | LAN clock to stabilize. My experiments indicates that the '593 can |
| 488 | be initialized immediately. The delay is probably needed for the |
| 489 | DC-to-DC converter to come up to full voltage, and for the oscillator |
| 490 | to be spot-on at 20Mhz before transmitting. |
| 491 | Until this proves to be a problem we rely on the higher layers for the |
| 492 | delay and save allocating a timer entry. */ |
| 493 | |
| 494 | /* maz : Well, I'm getting every time the following message |
| 495 | * without the delay on a 486@33. This machine is much too |
| 496 | * fast... :-) So maybe the Crynwr driver wasn't wrong after |
| 497 | * all, even if the message is completly harmless on my |
| 498 | * setup. */ |
| 499 | mdelay (50); |
| 500 | |
| 501 | /* This follows the packet driver's lead, and checks for success. */ |
| 502 | if (inb(ioaddr) != 0x10 && inb(ioaddr) != 0x00) |
| 503 | printk(KERN_WARNING "%s: Problem turning on the transceiver power.\n", |
| 504 | dev->name); |
| 505 | |
| 506 | hardware_init(dev); |
| 507 | netif_start_queue (dev); |
| 508 | |
| 509 | return 0; |
| 510 | } |
| 511 | |
| 512 | |
| 513 | static void znet_tx_timeout (struct net_device *dev) |
| 514 | { |
| 515 | int ioaddr = dev->base_addr; |
| 516 | ushort event, tx_status, rx_offset, state; |
| 517 | |
| 518 | outb (CR0_STATUS_0, ioaddr); |
| 519 | event = inb (ioaddr); |
| 520 | outb (CR0_STATUS_1, ioaddr); |
| 521 | tx_status = inw (ioaddr); |
| 522 | outb (CR0_STATUS_2, ioaddr); |
| 523 | rx_offset = inw (ioaddr); |
| 524 | outb (CR0_STATUS_3, ioaddr); |
| 525 | state = inb (ioaddr); |
| 526 | printk (KERN_WARNING "%s: transmit timed out, status %02x %04x %04x %02x," |
| 527 | " resetting.\n", dev->name, event, tx_status, rx_offset, state); |
| 528 | if (tx_status == TX_LOST_CRS) |
| 529 | printk (KERN_WARNING "%s: Tx carrier error, check transceiver cable.\n", |
| 530 | dev->name); |
| 531 | outb (OP0_RESET, ioaddr); |
| 532 | hardware_init (dev); |
| 533 | netif_wake_queue (dev); |
| 534 | } |
| 535 | |
| 536 | static int znet_send_packet(struct sk_buff *skb, struct net_device *dev) |
| 537 | { |
| 538 | int ioaddr = dev->base_addr; |
| 539 | struct znet_private *znet = dev->priv; |
| 540 | unsigned long flags; |
| 541 | short length = skb->len; |
| 542 | |
| 543 | if (znet_debug > 4) |
| 544 | printk(KERN_DEBUG "%s: ZNet_send_packet.\n", dev->name); |
| 545 | |
| 546 | if (length < ETH_ZLEN) { |
| 547 | skb = skb_padto(skb, ETH_ZLEN); |
| 548 | if (skb == NULL) |
| 549 | return 0; |
| 550 | length = ETH_ZLEN; |
| 551 | } |
| 552 | |
| 553 | netif_stop_queue (dev); |
| 554 | |
| 555 | /* Check that the part hasn't reset itself, probably from suspend. */ |
| 556 | outb(CR0_STATUS_0, ioaddr); |
| 557 | if (inw(ioaddr) == 0x0010 && |
| 558 | inw(ioaddr) == 0x0000 && |
| 559 | inw(ioaddr) == 0x0010) { |
| 560 | if (znet_debug > 1) |
| 561 | printk (KERN_WARNING "%s : waking up\n", dev->name); |
| 562 | hardware_init(dev); |
| 563 | znet_transceiver_power (dev, 1); |
| 564 | } |
| 565 | |
| 566 | if (1) { |
| 567 | unsigned char *buf = (void *)skb->data; |
| 568 | ushort *tx_link = znet->tx_cur - 1; |
| 569 | ushort rnd_len = (length + 1)>>1; |
| 570 | |
| 571 | znet->stats.tx_bytes+=length; |
| 572 | |
| 573 | if (znet->tx_cur >= znet->tx_end) |
| 574 | znet->tx_cur = znet->tx_start; |
| 575 | *znet->tx_cur++ = length; |
| 576 | if (znet->tx_cur + rnd_len + 1 > znet->tx_end) { |
| 577 | int semi_cnt = (znet->tx_end - znet->tx_cur)<<1; /* Cvrt to byte cnt. */ |
| 578 | memcpy(znet->tx_cur, buf, semi_cnt); |
| 579 | rnd_len -= semi_cnt>>1; |
| 580 | memcpy(znet->tx_start, buf + semi_cnt, length - semi_cnt); |
| 581 | znet->tx_cur = znet->tx_start + rnd_len; |
| 582 | } else { |
| 583 | memcpy(znet->tx_cur, buf, skb->len); |
| 584 | znet->tx_cur += rnd_len; |
| 585 | } |
| 586 | *znet->tx_cur++ = 0; |
| 587 | |
| 588 | spin_lock_irqsave(&znet->lock, flags); |
| 589 | { |
| 590 | *tx_link = OP0_TRANSMIT | CR0_CHNL; |
| 591 | /* Is this always safe to do? */ |
| 592 | outb(OP0_TRANSMIT | CR0_CHNL, ioaddr); |
| 593 | } |
| 594 | spin_unlock_irqrestore (&znet->lock, flags); |
| 595 | |
| 596 | dev->trans_start = jiffies; |
| 597 | netif_start_queue (dev); |
| 598 | |
| 599 | if (znet_debug > 4) |
| 600 | printk(KERN_DEBUG "%s: Transmitter queued, length %d.\n", dev->name, length); |
| 601 | } |
| 602 | dev_kfree_skb(skb); |
| 603 | return 0; |
| 604 | } |
| 605 | |
| 606 | /* The ZNET interrupt handler. */ |
| 607 | static irqreturn_t znet_interrupt(int irq, void *dev_id, struct pt_regs * regs) |
| 608 | { |
| 609 | struct net_device *dev = dev_id; |
| 610 | struct znet_private *znet = dev->priv; |
| 611 | int ioaddr; |
| 612 | int boguscnt = 20; |
| 613 | int handled = 0; |
| 614 | |
| 615 | if (dev == NULL) { |
| 616 | printk(KERN_WARNING "znet_interrupt(): IRQ %d for unknown device.\n", irq); |
| 617 | return IRQ_NONE; |
| 618 | } |
| 619 | |
| 620 | spin_lock (&znet->lock); |
| 621 | |
| 622 | ioaddr = dev->base_addr; |
| 623 | |
| 624 | outb(CR0_STATUS_0, ioaddr); |
| 625 | do { |
| 626 | ushort status = inb(ioaddr); |
| 627 | if (znet_debug > 5) { |
| 628 | ushort result, rx_ptr, running; |
| 629 | outb(CR0_STATUS_1, ioaddr); |
| 630 | result = inw(ioaddr); |
| 631 | outb(CR0_STATUS_2, ioaddr); |
| 632 | rx_ptr = inw(ioaddr); |
| 633 | outb(CR0_STATUS_3, ioaddr); |
| 634 | running = inb(ioaddr); |
| 635 | printk(KERN_DEBUG "%s: interrupt, status %02x, %04x %04x %02x serial %d.\n", |
| 636 | dev->name, status, result, rx_ptr, running, boguscnt); |
| 637 | } |
| 638 | if ((status & SR0_INTERRUPT) == 0) |
| 639 | break; |
| 640 | |
| 641 | handled = 1; |
| 642 | |
| 643 | if ((status & SR0_EVENT_MASK) == SR0_TRANSMIT_DONE || |
| 644 | (status & SR0_EVENT_MASK) == SR0_RETRANSMIT_DONE || |
| 645 | (status & SR0_EVENT_MASK) == SR0_TRANSMIT_NO_CRC_DONE) { |
| 646 | int tx_status; |
| 647 | outb(CR0_STATUS_1, ioaddr); |
| 648 | tx_status = inw(ioaddr); |
| 649 | /* It's undocumented, but tx_status seems to match the i82586. */ |
| 650 | if (tx_status & TX_OK) { |
| 651 | znet->stats.tx_packets++; |
| 652 | znet->stats.collisions += tx_status & TX_NCOL_MASK; |
| 653 | } else { |
| 654 | if (tx_status & (TX_LOST_CTS | TX_LOST_CRS)) |
| 655 | znet->stats.tx_carrier_errors++; |
| 656 | if (tx_status & TX_UND_RUN) |
| 657 | znet->stats.tx_fifo_errors++; |
| 658 | if (!(tx_status & TX_HRT_BEAT)) |
| 659 | znet->stats.tx_heartbeat_errors++; |
| 660 | if (tx_status & TX_MAX_COL) |
| 661 | znet->stats.tx_aborted_errors++; |
| 662 | /* ...and the catch-all. */ |
| 663 | if ((tx_status | (TX_LOST_CRS | TX_LOST_CTS | TX_UND_RUN | TX_HRT_BEAT | TX_MAX_COL)) != (TX_LOST_CRS | TX_LOST_CTS | TX_UND_RUN | TX_HRT_BEAT | TX_MAX_COL)) |
| 664 | znet->stats.tx_errors++; |
| 665 | |
| 666 | /* Transceiver may be stuck if cable |
| 667 | * was removed while emiting a |
| 668 | * packet. Flip it off, then on to |
| 669 | * reset it. This is very empirical, |
| 670 | * but it seems to work. */ |
| 671 | |
| 672 | znet_transceiver_power (dev, 0); |
| 673 | znet_transceiver_power (dev, 1); |
| 674 | } |
| 675 | netif_wake_queue (dev); |
| 676 | } |
| 677 | |
| 678 | if ((status & SR0_RECEPTION) || |
| 679 | (status & SR0_EVENT_MASK) == SR0_STOP_REG_HIT) { |
| 680 | znet_rx(dev); |
| 681 | } |
| 682 | /* Clear the interrupts we've handled. */ |
| 683 | outb(CR0_INT_ACK, ioaddr); |
| 684 | } while (boguscnt--); |
| 685 | |
| 686 | spin_unlock (&znet->lock); |
| 687 | |
| 688 | return IRQ_RETVAL(handled); |
| 689 | } |
| 690 | |
| 691 | static void znet_rx(struct net_device *dev) |
| 692 | { |
| 693 | struct znet_private *znet = dev->priv; |
| 694 | int ioaddr = dev->base_addr; |
| 695 | int boguscount = 1; |
| 696 | short next_frame_end_offset = 0; /* Offset of next frame start. */ |
| 697 | short *cur_frame_end; |
| 698 | short cur_frame_end_offset; |
| 699 | |
| 700 | outb(CR0_STATUS_2, ioaddr); |
| 701 | cur_frame_end_offset = inw(ioaddr); |
| 702 | |
| 703 | if (cur_frame_end_offset == znet->rx_cur - znet->rx_start) { |
| 704 | printk(KERN_WARNING "%s: Interrupted, but nothing to receive, offset %03x.\n", |
| 705 | dev->name, cur_frame_end_offset); |
| 706 | return; |
| 707 | } |
| 708 | |
| 709 | /* Use same method as the Crynwr driver: construct a forward list in |
| 710 | the same area of the backwards links we now have. This allows us to |
| 711 | pass packets to the upper layers in the order they were received -- |
| 712 | important for fast-path sequential operations. */ |
| 713 | while (znet->rx_start + cur_frame_end_offset != znet->rx_cur |
| 714 | && ++boguscount < 5) { |
| 715 | unsigned short hi_cnt, lo_cnt, hi_status, lo_status; |
| 716 | int count, status; |
| 717 | |
| 718 | if (cur_frame_end_offset < 4) { |
| 719 | /* Oh no, we have a special case: the frame trailer wraps around |
| 720 | the end of the ring buffer. We've saved space at the end of |
| 721 | the ring buffer for just this problem. */ |
| 722 | memcpy(znet->rx_end, znet->rx_start, 8); |
| 723 | cur_frame_end_offset += (RX_BUF_SIZE/2); |
| 724 | } |
| 725 | cur_frame_end = znet->rx_start + cur_frame_end_offset - 4; |
| 726 | |
| 727 | lo_status = *cur_frame_end++; |
| 728 | hi_status = *cur_frame_end++; |
| 729 | status = ((hi_status & 0xff) << 8) + (lo_status & 0xff); |
| 730 | lo_cnt = *cur_frame_end++; |
| 731 | hi_cnt = *cur_frame_end++; |
| 732 | count = ((hi_cnt & 0xff) << 8) + (lo_cnt & 0xff); |
| 733 | |
| 734 | if (znet_debug > 5) |
| 735 | printk(KERN_DEBUG "Constructing trailer at location %03x, %04x %04x %04x %04x" |
| 736 | " count %#x status %04x.\n", |
| 737 | cur_frame_end_offset<<1, lo_status, hi_status, lo_cnt, hi_cnt, |
| 738 | count, status); |
| 739 | cur_frame_end[-4] = status; |
| 740 | cur_frame_end[-3] = next_frame_end_offset; |
| 741 | cur_frame_end[-2] = count; |
| 742 | next_frame_end_offset = cur_frame_end_offset; |
| 743 | cur_frame_end_offset -= ((count + 1)>>1) + 3; |
| 744 | if (cur_frame_end_offset < 0) |
| 745 | cur_frame_end_offset += RX_BUF_SIZE/2; |
| 746 | }; |
| 747 | |
| 748 | /* Now step forward through the list. */ |
| 749 | do { |
| 750 | ushort *this_rfp_ptr = znet->rx_start + next_frame_end_offset; |
| 751 | int status = this_rfp_ptr[-4]; |
| 752 | int pkt_len = this_rfp_ptr[-2]; |
| 753 | |
| 754 | if (znet_debug > 5) |
| 755 | printk(KERN_DEBUG "Looking at trailer ending at %04x status %04x length %03x" |
| 756 | " next %04x.\n", next_frame_end_offset<<1, status, pkt_len, |
| 757 | this_rfp_ptr[-3]<<1); |
| 758 | /* Once again we must assume that the i82586 docs apply. */ |
| 759 | if ( ! (status & RX_RCV_OK)) { /* There was an error. */ |
| 760 | znet->stats.rx_errors++; |
| 761 | if (status & RX_CRC_ERR) znet->stats.rx_crc_errors++; |
| 762 | if (status & RX_ALG_ERR) znet->stats.rx_frame_errors++; |
| 763 | #if 0 |
| 764 | if (status & 0x0200) znet->stats.rx_over_errors++; /* Wrong. */ |
| 765 | if (status & 0x0100) znet->stats.rx_fifo_errors++; |
| 766 | #else |
| 767 | /* maz : Wild guess... */ |
| 768 | if (status & RX_OVRRUN) znet->stats.rx_over_errors++; |
| 769 | #endif |
| 770 | if (status & RX_SRT_FRM) znet->stats.rx_length_errors++; |
| 771 | } else if (pkt_len > 1536) { |
| 772 | znet->stats.rx_length_errors++; |
| 773 | } else { |
| 774 | /* Malloc up new buffer. */ |
| 775 | struct sk_buff *skb; |
| 776 | |
| 777 | skb = dev_alloc_skb(pkt_len); |
| 778 | if (skb == NULL) { |
| 779 | if (znet_debug) |
| 780 | printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n", dev->name); |
| 781 | znet->stats.rx_dropped++; |
| 782 | break; |
| 783 | } |
| 784 | skb->dev = dev; |
| 785 | |
| 786 | if (&znet->rx_cur[(pkt_len+1)>>1] > znet->rx_end) { |
| 787 | int semi_cnt = (znet->rx_end - znet->rx_cur)<<1; |
| 788 | memcpy(skb_put(skb,semi_cnt), znet->rx_cur, semi_cnt); |
| 789 | memcpy(skb_put(skb,pkt_len-semi_cnt), znet->rx_start, |
| 790 | pkt_len - semi_cnt); |
| 791 | } else { |
| 792 | memcpy(skb_put(skb,pkt_len), znet->rx_cur, pkt_len); |
| 793 | if (znet_debug > 6) { |
| 794 | unsigned int *packet = (unsigned int *) skb->data; |
| 795 | printk(KERN_DEBUG "Packet data is %08x %08x %08x %08x.\n", packet[0], |
| 796 | packet[1], packet[2], packet[3]); |
| 797 | } |
| 798 | } |
| 799 | skb->protocol=eth_type_trans(skb,dev); |
| 800 | netif_rx(skb); |
| 801 | dev->last_rx = jiffies; |
| 802 | znet->stats.rx_packets++; |
| 803 | znet->stats.rx_bytes += pkt_len; |
| 804 | } |
| 805 | znet->rx_cur = this_rfp_ptr; |
| 806 | if (znet->rx_cur >= znet->rx_end) |
| 807 | znet->rx_cur -= RX_BUF_SIZE/2; |
| 808 | update_stop_hit(ioaddr, (znet->rx_cur - znet->rx_start)<<1); |
| 809 | next_frame_end_offset = this_rfp_ptr[-3]; |
| 810 | if (next_frame_end_offset == 0) /* Read all the frames? */ |
| 811 | break; /* Done for now */ |
| 812 | this_rfp_ptr = znet->rx_start + next_frame_end_offset; |
| 813 | } while (--boguscount); |
| 814 | |
| 815 | /* If any worth-while packets have been received, dev_rint() |
| 816 | has done a mark_bh(INET_BH) for us and will work on them |
| 817 | when we get to the bottom-half routine. */ |
| 818 | return; |
| 819 | } |
| 820 | |
| 821 | /* The inverse routine to znet_open(). */ |
| 822 | static int znet_close(struct net_device *dev) |
| 823 | { |
| 824 | int ioaddr = dev->base_addr; |
| 825 | |
| 826 | netif_stop_queue (dev); |
| 827 | |
| 828 | outb(OP0_RESET, ioaddr); /* CMD0_RESET */ |
| 829 | |
| 830 | if (znet_debug > 1) |
| 831 | printk(KERN_DEBUG "%s: Shutting down ethercard.\n", dev->name); |
| 832 | /* Turn off transceiver power. */ |
| 833 | znet_transceiver_power (dev, 0); |
| 834 | |
| 835 | znet_release_resources (dev); |
| 836 | |
| 837 | return 0; |
| 838 | } |
| 839 | |
| 840 | /* Get the current statistics. This may be called with the card open or |
| 841 | closed. */ |
| 842 | static struct net_device_stats *net_get_stats(struct net_device *dev) |
| 843 | { |
| 844 | struct znet_private *znet = dev->priv; |
| 845 | |
| 846 | return &znet->stats; |
| 847 | } |
| 848 | |
| 849 | static void show_dma(struct net_device *dev) |
| 850 | { |
| 851 | short ioaddr = dev->base_addr; |
| 852 | unsigned char stat = inb (ioaddr); |
| 853 | struct znet_private *znet = dev->priv; |
| 854 | unsigned long flags; |
| 855 | short dma_port = ((znet->tx_dma&3)<<2) + IO_DMA2_BASE; |
| 856 | unsigned addr = inb(dma_port); |
| 857 | short residue; |
| 858 | |
| 859 | addr |= inb(dma_port) << 8; |
| 860 | residue = get_dma_residue(znet->tx_dma); |
| 861 | |
| 862 | if (znet_debug > 1) { |
| 863 | flags=claim_dma_lock(); |
| 864 | printk(KERN_DEBUG "Stat:%02x Addr: %04x cnt:%3x\n", |
| 865 | stat, addr<<1, residue); |
| 866 | release_dma_lock(flags); |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | /* Initialize the hardware. We have to do this when the board is open()ed |
| 871 | or when we come out of suspend mode. */ |
| 872 | static void hardware_init(struct net_device *dev) |
| 873 | { |
| 874 | unsigned long flags; |
| 875 | short ioaddr = dev->base_addr; |
| 876 | struct znet_private *znet = dev->priv; |
| 877 | |
| 878 | znet->rx_cur = znet->rx_start; |
| 879 | znet->tx_cur = znet->tx_start; |
| 880 | |
| 881 | /* Reset the chip, and start it up. */ |
| 882 | outb(OP0_RESET, ioaddr); |
| 883 | |
| 884 | flags=claim_dma_lock(); |
| 885 | disable_dma(znet->rx_dma); /* reset by an interrupting task. */ |
| 886 | clear_dma_ff(znet->rx_dma); |
| 887 | set_dma_mode(znet->rx_dma, DMA_RX_MODE); |
| 888 | set_dma_addr(znet->rx_dma, (unsigned int) znet->rx_start); |
| 889 | set_dma_count(znet->rx_dma, RX_BUF_SIZE); |
| 890 | enable_dma(znet->rx_dma); |
| 891 | /* Now set up the Tx channel. */ |
| 892 | disable_dma(znet->tx_dma); |
| 893 | clear_dma_ff(znet->tx_dma); |
| 894 | set_dma_mode(znet->tx_dma, DMA_TX_MODE); |
| 895 | set_dma_addr(znet->tx_dma, (unsigned int) znet->tx_start); |
| 896 | set_dma_count(znet->tx_dma, znet->tx_buf_len<<1); |
| 897 | enable_dma(znet->tx_dma); |
| 898 | release_dma_lock(flags); |
| 899 | |
| 900 | if (znet_debug > 1) |
| 901 | printk(KERN_DEBUG "%s: Initializing the i82593, rx buf %p tx buf %p\n", |
| 902 | dev->name, znet->rx_start,znet->tx_start); |
| 903 | /* Do an empty configure command, just like the Crynwr driver. This |
| 904 | resets to chip to its default values. */ |
| 905 | *znet->tx_cur++ = 0; |
| 906 | *znet->tx_cur++ = 0; |
| 907 | show_dma(dev); |
| 908 | outb(OP0_CONFIGURE | CR0_CHNL, ioaddr); |
| 909 | |
| 910 | znet_set_multicast_list (dev); |
| 911 | |
| 912 | *znet->tx_cur++ = 6; |
| 913 | memcpy(znet->tx_cur, dev->dev_addr, 6); |
| 914 | znet->tx_cur += 3; |
| 915 | show_dma(dev); |
| 916 | outb(OP0_IA_SETUP | CR0_CHNL, ioaddr); |
| 917 | show_dma(dev); |
| 918 | |
| 919 | update_stop_hit(ioaddr, 8192); |
| 920 | if (znet_debug > 1) printk(KERN_DEBUG "enabling Rx.\n"); |
| 921 | outb(OP0_RCV_ENABLE, ioaddr); |
| 922 | netif_start_queue (dev); |
| 923 | } |
| 924 | |
| 925 | static void update_stop_hit(short ioaddr, unsigned short rx_stop_offset) |
| 926 | { |
| 927 | outb(OP0_SWIT_TO_PORT_1 | CR0_CHNL, ioaddr); |
| 928 | if (znet_debug > 5) |
| 929 | printk(KERN_DEBUG "Updating stop hit with value %02x.\n", |
| 930 | (rx_stop_offset >> 6) | CR1_STOP_REG_UPDATE); |
| 931 | outb((rx_stop_offset >> 6) | CR1_STOP_REG_UPDATE, ioaddr); |
| 932 | outb(OP1_SWIT_TO_PORT_0, ioaddr); |
| 933 | } |
| 934 | |
| 935 | static __exit void znet_cleanup (void) |
| 936 | { |
| 937 | if (znet_dev) { |
| 938 | struct znet_private *znet = znet_dev->priv; |
| 939 | |
| 940 | unregister_netdev (znet_dev); |
| 941 | kfree (znet->rx_start); |
| 942 | kfree (znet->tx_start); |
| 943 | free_netdev (znet_dev); |
| 944 | } |
| 945 | } |
| 946 | |
| 947 | module_init (znet_probe); |
| 948 | module_exit (znet_cleanup); |