| 1 | /* |
| 2 | * de620.c $Revision: 1.40 $ BETA |
| 3 | * |
| 4 | * |
| 5 | * Linux driver for the D-Link DE-620 Ethernet pocket adapter. |
| 6 | * |
| 7 | * Portions (C) Copyright 1993, 1994 by Bjorn Ekwall <bj0rn@blox.se> |
| 8 | * |
| 9 | * Based on adapter information gathered from DOS packetdriver |
| 10 | * sources from D-Link Inc: (Special thanks to Henry Ngai of D-Link.) |
| 11 | * Portions (C) Copyright D-Link SYSTEM Inc. 1991, 1992 |
| 12 | * Copyright, 1988, Russell Nelson, Crynwr Software |
| 13 | * |
| 14 | * Adapted to the sample network driver core for linux, |
| 15 | * written by: Donald Becker <becker@super.org> |
| 16 | * (Now at <becker@scyld.com>) |
| 17 | * |
| 18 | * Valuable assistance from: |
| 19 | * J. Joshua Kopper <kopper@rtsg.mot.com> |
| 20 | * Olav Kvittem <Olav.Kvittem@uninett.no> |
| 21 | * Germano Caronni <caronni@nessie.cs.id.ethz.ch> |
| 22 | * Jeremy Fitzhardinge <jeremy@suite.sw.oz.au> |
| 23 | * |
| 24 | *****************************************************************************/ |
| 25 | /* |
| 26 | * This program is free software; you can redistribute it and/or modify |
| 27 | * it under the terms of the GNU General Public License as published by |
| 28 | * the Free Software Foundation; either version 2, or (at your option) |
| 29 | * any later version. |
| 30 | * |
| 31 | * This program is distributed in the hope that it will be useful, |
| 32 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 33 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 34 | * GNU General Public License for more details. |
| 35 | * |
| 36 | * You should have received a copy of the GNU General Public License |
| 37 | * along with this program; if not, write to the Free Software |
| 38 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 39 | * |
| 40 | *****************************************************************************/ |
| 41 | static const char version[] = |
| 42 | "de620.c: $Revision: 1.40 $, Bjorn Ekwall <bj0rn@blox.se>\n"; |
| 43 | |
| 44 | /*********************************************************************** |
| 45 | * |
| 46 | * "Tuning" section. |
| 47 | * |
| 48 | * Compile-time options: (see below for descriptions) |
| 49 | * -DDE620_IO=0x378 (lpt1) |
| 50 | * -DDE620_IRQ=7 (lpt1) |
| 51 | * -DSHUTDOWN_WHEN_LOST |
| 52 | * -DCOUNT_LOOPS |
| 53 | * -DLOWSPEED |
| 54 | * -DREAD_DELAY |
| 55 | * -DWRITE_DELAY |
| 56 | */ |
| 57 | |
| 58 | /* |
| 59 | * This driver assumes that the printer port is a "normal", |
| 60 | * dumb, uni-directional port! |
| 61 | * If your port is "fancy" in any way, please try to set it to "normal" |
| 62 | * with your BIOS setup. I have no access to machines with bi-directional |
| 63 | * ports, so I can't test such a driver :-( |
| 64 | * (Yes, I _know_ it is possible to use DE620 with bidirectional ports...) |
| 65 | * |
| 66 | * There are some clones of DE620 out there, with different names. |
| 67 | * If the current driver does not recognize a clone, try to change |
| 68 | * the following #define to: |
| 69 | * |
| 70 | * #define DE620_CLONE 1 |
| 71 | */ |
| 72 | #define DE620_CLONE 0 |
| 73 | |
| 74 | /* |
| 75 | * If the adapter has problems with high speeds, enable this #define |
| 76 | * otherwise full printerport speed will be attempted. |
| 77 | * |
| 78 | * You can tune the READ_DELAY/WRITE_DELAY below if you enable LOWSPEED |
| 79 | * |
| 80 | #define LOWSPEED |
| 81 | */ |
| 82 | |
| 83 | #ifndef READ_DELAY |
| 84 | #define READ_DELAY 100 /* adapter internal read delay in 100ns units */ |
| 85 | #endif |
| 86 | |
| 87 | #ifndef WRITE_DELAY |
| 88 | #define WRITE_DELAY 100 /* adapter internal write delay in 100ns units */ |
| 89 | #endif |
| 90 | |
| 91 | /* |
| 92 | * Enable this #define if you want the adapter to do a "ifconfig down" on |
| 93 | * itself when we have detected that something is possibly wrong with it. |
| 94 | * The default behaviour is to retry with "adapter_init()" until success. |
| 95 | * This should be used for debugging purposes only. |
| 96 | * |
| 97 | #define SHUTDOWN_WHEN_LOST |
| 98 | */ |
| 99 | |
| 100 | #ifdef LOWSPEED |
| 101 | /* |
| 102 | * Enable this #define if you want to see debugging output that show how long |
| 103 | * we have to wait before the DE-620 is ready for the next read/write/command. |
| 104 | * |
| 105 | #define COUNT_LOOPS |
| 106 | */ |
| 107 | #endif |
| 108 | |
| 109 | #include <linux/module.h> |
| 110 | #include <linux/kernel.h> |
| 111 | #include <linux/types.h> |
| 112 | #include <linux/fcntl.h> |
| 113 | #include <linux/string.h> |
| 114 | #include <linux/interrupt.h> |
| 115 | #include <linux/ioport.h> |
| 116 | #include <linux/in.h> |
| 117 | #include <linux/errno.h> |
| 118 | #include <linux/init.h> |
| 119 | #include <linux/inet.h> |
| 120 | #include <linux/netdevice.h> |
| 121 | #include <linux/etherdevice.h> |
| 122 | #include <linux/skbuff.h> |
| 123 | |
| 124 | #include <asm/io.h> |
| 125 | #include <asm/system.h> |
| 126 | |
| 127 | /* Constant definitions for the DE-620 registers, commands and bits */ |
| 128 | #include "de620.h" |
| 129 | |
| 130 | typedef unsigned char byte; |
| 131 | |
| 132 | /******************************************************* |
| 133 | * * |
| 134 | * Definition of D-Link DE-620 Ethernet Pocket adapter * |
| 135 | * See also "de620.h" * |
| 136 | * * |
| 137 | *******************************************************/ |
| 138 | #ifndef DE620_IO /* Compile-time configurable */ |
| 139 | #define DE620_IO 0x378 |
| 140 | #endif |
| 141 | |
| 142 | #ifndef DE620_IRQ /* Compile-time configurable */ |
| 143 | #define DE620_IRQ 7 |
| 144 | #endif |
| 145 | |
| 146 | #define DATA_PORT (dev->base_addr) |
| 147 | #define STATUS_PORT (dev->base_addr + 1) |
| 148 | #define COMMAND_PORT (dev->base_addr + 2) |
| 149 | |
| 150 | #define RUNT 60 /* Too small Ethernet packet */ |
| 151 | #define GIANT 1514 /* largest legal size packet, no fcs */ |
| 152 | |
| 153 | /* |
| 154 | * Force media with insmod: |
| 155 | * insmod de620.o bnc=1 |
| 156 | * or |
| 157 | * insmod de620.o utp=1 |
| 158 | * |
| 159 | * Force io and/or irq with insmod: |
| 160 | * insmod de620.o io=0x378 irq=7 |
| 161 | * |
| 162 | * Make a clone skip the Ethernet-address range check: |
| 163 | * insmod de620.o clone=1 |
| 164 | */ |
| 165 | static int bnc; |
| 166 | static int utp; |
| 167 | static int io = DE620_IO; |
| 168 | static int irq = DE620_IRQ; |
| 169 | static int clone = DE620_CLONE; |
| 170 | |
| 171 | static spinlock_t de620_lock; |
| 172 | |
| 173 | module_param(bnc, int, 0); |
| 174 | module_param(utp, int, 0); |
| 175 | module_param(io, int, 0); |
| 176 | module_param(irq, int, 0); |
| 177 | module_param(clone, int, 0); |
| 178 | MODULE_PARM_DESC(bnc, "DE-620 set BNC medium (0-1)"); |
| 179 | MODULE_PARM_DESC(utp, "DE-620 set UTP medium (0-1)"); |
| 180 | MODULE_PARM_DESC(io, "DE-620 I/O base address,required"); |
| 181 | MODULE_PARM_DESC(irq, "DE-620 IRQ number,required"); |
| 182 | MODULE_PARM_DESC(clone, "Check also for non-D-Link DE-620 clones (0-1)"); |
| 183 | |
| 184 | /*********************************************** |
| 185 | * * |
| 186 | * Index to functions, as function prototypes. * |
| 187 | * * |
| 188 | ***********************************************/ |
| 189 | |
| 190 | /* |
| 191 | * Routines used internally. (See also "convenience macros.. below") |
| 192 | */ |
| 193 | |
| 194 | /* Put in the device structure. */ |
| 195 | static int de620_open(struct net_device *); |
| 196 | static int de620_close(struct net_device *); |
| 197 | static void de620_set_multicast_list(struct net_device *); |
| 198 | static int de620_start_xmit(struct sk_buff *, struct net_device *); |
| 199 | |
| 200 | /* Dispatch from interrupts. */ |
| 201 | static irqreturn_t de620_interrupt(int, void *); |
| 202 | static int de620_rx_intr(struct net_device *); |
| 203 | |
| 204 | /* Initialization */ |
| 205 | static int adapter_init(struct net_device *); |
| 206 | static int read_eeprom(struct net_device *); |
| 207 | |
| 208 | |
| 209 | /* |
| 210 | * D-Link driver variables: |
| 211 | */ |
| 212 | #define SCR_DEF NIBBLEMODE |INTON | SLEEP | AUTOTX |
| 213 | #define TCR_DEF RXPB /* not used: | TXSUCINT | T16INT */ |
| 214 | #define DE620_RX_START_PAGE 12 /* 12 pages (=3k) reserved for tx */ |
| 215 | #define DEF_NIC_CMD IRQEN | ICEN | DS1 |
| 216 | |
| 217 | static volatile byte NIC_Cmd; |
| 218 | static volatile byte next_rx_page; |
| 219 | static byte first_rx_page; |
| 220 | static byte last_rx_page; |
| 221 | static byte EIPRegister; |
| 222 | |
| 223 | static struct nic { |
| 224 | byte NodeID[6]; |
| 225 | byte RAM_Size; |
| 226 | byte Model; |
| 227 | byte Media; |
| 228 | byte SCR; |
| 229 | } nic_data; |
| 230 | |
| 231 | /********************************************************** |
| 232 | * * |
| 233 | * Convenience macros/functions for D-Link DE-620 adapter * |
| 234 | * * |
| 235 | **********************************************************/ |
| 236 | #define de620_tx_buffs(dd) (inb(STATUS_PORT) & (TXBF0 | TXBF1)) |
| 237 | #define de620_flip_ds(dd) NIC_Cmd ^= DS0 | DS1; outb(NIC_Cmd, COMMAND_PORT); |
| 238 | |
| 239 | /* Check for ready-status, and return a nibble (high 4 bits) for data input */ |
| 240 | #ifdef COUNT_LOOPS |
| 241 | static int tot_cnt; |
| 242 | #endif |
| 243 | static inline byte |
| 244 | de620_ready(struct net_device *dev) |
| 245 | { |
| 246 | byte value; |
| 247 | register short int cnt = 0; |
| 248 | |
| 249 | while ((((value = inb(STATUS_PORT)) & READY) == 0) && (cnt <= 1000)) |
| 250 | ++cnt; |
| 251 | |
| 252 | #ifdef COUNT_LOOPS |
| 253 | tot_cnt += cnt; |
| 254 | #endif |
| 255 | return value & 0xf0; /* nibble */ |
| 256 | } |
| 257 | |
| 258 | static inline void |
| 259 | de620_send_command(struct net_device *dev, byte cmd) |
| 260 | { |
| 261 | de620_ready(dev); |
| 262 | if (cmd == W_DUMMY) |
| 263 | outb(NIC_Cmd, COMMAND_PORT); |
| 264 | |
| 265 | outb(cmd, DATA_PORT); |
| 266 | |
| 267 | outb(NIC_Cmd ^ CS0, COMMAND_PORT); |
| 268 | de620_ready(dev); |
| 269 | outb(NIC_Cmd, COMMAND_PORT); |
| 270 | } |
| 271 | |
| 272 | static inline void |
| 273 | de620_put_byte(struct net_device *dev, byte value) |
| 274 | { |
| 275 | /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */ |
| 276 | de620_ready(dev); |
| 277 | outb(value, DATA_PORT); |
| 278 | de620_flip_ds(dev); |
| 279 | } |
| 280 | |
| 281 | static inline byte |
| 282 | de620_read_byte(struct net_device *dev) |
| 283 | { |
| 284 | byte value; |
| 285 | |
| 286 | /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */ |
| 287 | value = de620_ready(dev); /* High nibble */ |
| 288 | de620_flip_ds(dev); |
| 289 | value |= de620_ready(dev) >> 4; /* Low nibble */ |
| 290 | return value; |
| 291 | } |
| 292 | |
| 293 | static inline void |
| 294 | de620_write_block(struct net_device *dev, byte *buffer, int count, int pad) |
| 295 | { |
| 296 | #ifndef LOWSPEED |
| 297 | byte uflip = NIC_Cmd ^ (DS0 | DS1); |
| 298 | byte dflip = NIC_Cmd; |
| 299 | #else /* LOWSPEED */ |
| 300 | #ifdef COUNT_LOOPS |
| 301 | int bytes = count; |
| 302 | #endif /* COUNT_LOOPS */ |
| 303 | #endif /* LOWSPEED */ |
| 304 | |
| 305 | #ifdef LOWSPEED |
| 306 | #ifdef COUNT_LOOPS |
| 307 | tot_cnt = 0; |
| 308 | #endif /* COUNT_LOOPS */ |
| 309 | /* No further optimization useful, the limit is in the adapter. */ |
| 310 | for ( ; count > 0; --count, ++buffer) { |
| 311 | de620_put_byte(dev,*buffer); |
| 312 | } |
| 313 | for ( count = pad ; count > 0; --count, ++buffer) { |
| 314 | de620_put_byte(dev, 0); |
| 315 | } |
| 316 | de620_send_command(dev,W_DUMMY); |
| 317 | #ifdef COUNT_LOOPS |
| 318 | /* trial debug output: loops per byte in de620_ready() */ |
| 319 | printk("WRITE(%d)\n", tot_cnt/((bytes?bytes:1))); |
| 320 | #endif /* COUNT_LOOPS */ |
| 321 | #else /* not LOWSPEED */ |
| 322 | for ( ; count > 0; count -=2) { |
| 323 | outb(*buffer++, DATA_PORT); |
| 324 | outb(uflip, COMMAND_PORT); |
| 325 | outb(*buffer++, DATA_PORT); |
| 326 | outb(dflip, COMMAND_PORT); |
| 327 | } |
| 328 | de620_send_command(dev,W_DUMMY); |
| 329 | #endif /* LOWSPEED */ |
| 330 | } |
| 331 | |
| 332 | static inline void |
| 333 | de620_read_block(struct net_device *dev, byte *data, int count) |
| 334 | { |
| 335 | #ifndef LOWSPEED |
| 336 | byte value; |
| 337 | byte uflip = NIC_Cmd ^ (DS0 | DS1); |
| 338 | byte dflip = NIC_Cmd; |
| 339 | #else /* LOWSPEED */ |
| 340 | #ifdef COUNT_LOOPS |
| 341 | int bytes = count; |
| 342 | |
| 343 | tot_cnt = 0; |
| 344 | #endif /* COUNT_LOOPS */ |
| 345 | #endif /* LOWSPEED */ |
| 346 | |
| 347 | #ifdef LOWSPEED |
| 348 | /* No further optimization useful, the limit is in the adapter. */ |
| 349 | while (count-- > 0) { |
| 350 | *data++ = de620_read_byte(dev); |
| 351 | de620_flip_ds(dev); |
| 352 | } |
| 353 | #ifdef COUNT_LOOPS |
| 354 | /* trial debug output: loops per byte in de620_ready() */ |
| 355 | printk("READ(%d)\n", tot_cnt/(2*(bytes?bytes:1))); |
| 356 | #endif /* COUNT_LOOPS */ |
| 357 | #else /* not LOWSPEED */ |
| 358 | while (count-- > 0) { |
| 359 | value = inb(STATUS_PORT) & 0xf0; /* High nibble */ |
| 360 | outb(uflip, COMMAND_PORT); |
| 361 | *data++ = value | inb(STATUS_PORT) >> 4; /* Low nibble */ |
| 362 | outb(dflip , COMMAND_PORT); |
| 363 | } |
| 364 | #endif /* LOWSPEED */ |
| 365 | } |
| 366 | |
| 367 | static inline void |
| 368 | de620_set_delay(struct net_device *dev) |
| 369 | { |
| 370 | de620_ready(dev); |
| 371 | outb(W_DFR, DATA_PORT); |
| 372 | outb(NIC_Cmd ^ CS0, COMMAND_PORT); |
| 373 | |
| 374 | de620_ready(dev); |
| 375 | #ifdef LOWSPEED |
| 376 | outb(WRITE_DELAY, DATA_PORT); |
| 377 | #else |
| 378 | outb(0, DATA_PORT); |
| 379 | #endif |
| 380 | de620_flip_ds(dev); |
| 381 | |
| 382 | de620_ready(dev); |
| 383 | #ifdef LOWSPEED |
| 384 | outb(READ_DELAY, DATA_PORT); |
| 385 | #else |
| 386 | outb(0, DATA_PORT); |
| 387 | #endif |
| 388 | de620_flip_ds(dev); |
| 389 | } |
| 390 | |
| 391 | static inline void |
| 392 | de620_set_register(struct net_device *dev, byte reg, byte value) |
| 393 | { |
| 394 | de620_ready(dev); |
| 395 | outb(reg, DATA_PORT); |
| 396 | outb(NIC_Cmd ^ CS0, COMMAND_PORT); |
| 397 | |
| 398 | de620_put_byte(dev, value); |
| 399 | } |
| 400 | |
| 401 | static inline byte |
| 402 | de620_get_register(struct net_device *dev, byte reg) |
| 403 | { |
| 404 | byte value; |
| 405 | |
| 406 | de620_send_command(dev,reg); |
| 407 | value = de620_read_byte(dev); |
| 408 | de620_send_command(dev,W_DUMMY); |
| 409 | |
| 410 | return value; |
| 411 | } |
| 412 | |
| 413 | /********************************************************************* |
| 414 | * |
| 415 | * Open/initialize the board. |
| 416 | * |
| 417 | * This routine should set everything up anew at each open, even |
| 418 | * registers that "should" only need to be set once at boot, so that |
| 419 | * there is a non-reboot way to recover if something goes wrong. |
| 420 | * |
| 421 | */ |
| 422 | static int de620_open(struct net_device *dev) |
| 423 | { |
| 424 | int ret = request_irq(dev->irq, de620_interrupt, 0, dev->name, dev); |
| 425 | if (ret) { |
| 426 | printk (KERN_ERR "%s: unable to get IRQ %d\n", dev->name, dev->irq); |
| 427 | return ret; |
| 428 | } |
| 429 | |
| 430 | if (adapter_init(dev)) { |
| 431 | ret = -EIO; |
| 432 | goto out_free_irq; |
| 433 | } |
| 434 | |
| 435 | netif_start_queue(dev); |
| 436 | return 0; |
| 437 | |
| 438 | out_free_irq: |
| 439 | free_irq(dev->irq, dev); |
| 440 | return ret; |
| 441 | } |
| 442 | |
| 443 | /************************************************ |
| 444 | * |
| 445 | * The inverse routine to de620_open(). |
| 446 | * |
| 447 | */ |
| 448 | |
| 449 | static int de620_close(struct net_device *dev) |
| 450 | { |
| 451 | netif_stop_queue(dev); |
| 452 | /* disable recv */ |
| 453 | de620_set_register(dev, W_TCR, RXOFF); |
| 454 | free_irq(dev->irq, dev); |
| 455 | return 0; |
| 456 | } |
| 457 | |
| 458 | /********************************************* |
| 459 | * |
| 460 | * Set or clear the multicast filter for this adaptor. |
| 461 | * (no real multicast implemented for the DE-620, but she can be promiscuous...) |
| 462 | * |
| 463 | */ |
| 464 | |
| 465 | static void de620_set_multicast_list(struct net_device *dev) |
| 466 | { |
| 467 | if (dev->mc_count || dev->flags&(IFF_ALLMULTI|IFF_PROMISC)) |
| 468 | { /* Enable promiscuous mode */ |
| 469 | de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL); |
| 470 | } |
| 471 | else |
| 472 | { /* Disable promiscuous mode, use normal mode */ |
| 473 | de620_set_register(dev, W_TCR, TCR_DEF); |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | /******************************************************* |
| 478 | * |
| 479 | * Handle timeouts on transmit |
| 480 | */ |
| 481 | |
| 482 | static void de620_timeout(struct net_device *dev) |
| 483 | { |
| 484 | printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, "network cable problem"); |
| 485 | /* Restart the adapter. */ |
| 486 | if (!adapter_init(dev)) /* maybe close it */ |
| 487 | netif_wake_queue(dev); |
| 488 | } |
| 489 | |
| 490 | /******************************************************* |
| 491 | * |
| 492 | * Copy a buffer to the adapter transmit page memory. |
| 493 | * Start sending. |
| 494 | */ |
| 495 | static int de620_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 496 | { |
| 497 | unsigned long flags; |
| 498 | int len; |
| 499 | byte *buffer = skb->data; |
| 500 | byte using_txbuf; |
| 501 | |
| 502 | using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */ |
| 503 | |
| 504 | netif_stop_queue(dev); |
| 505 | |
| 506 | |
| 507 | if ((len = skb->len) < RUNT) |
| 508 | len = RUNT; |
| 509 | if (len & 1) /* send an even number of bytes */ |
| 510 | ++len; |
| 511 | |
| 512 | /* Start real output */ |
| 513 | |
| 514 | spin_lock_irqsave(&de620_lock, flags); |
| 515 | pr_debug("de620_start_xmit: len=%d, bufs 0x%02x\n", |
| 516 | (int)skb->len, using_txbuf); |
| 517 | |
| 518 | /* select a free tx buffer. if there is one... */ |
| 519 | switch (using_txbuf) { |
| 520 | default: /* both are free: use TXBF0 */ |
| 521 | case TXBF1: /* use TXBF0 */ |
| 522 | de620_send_command(dev,W_CR | RW0); |
| 523 | using_txbuf |= TXBF0; |
| 524 | break; |
| 525 | |
| 526 | case TXBF0: /* use TXBF1 */ |
| 527 | de620_send_command(dev,W_CR | RW1); |
| 528 | using_txbuf |= TXBF1; |
| 529 | break; |
| 530 | |
| 531 | case (TXBF0 | TXBF1): /* NONE!!! */ |
| 532 | printk(KERN_WARNING "%s: No tx-buffer available!\n", dev->name); |
| 533 | spin_unlock_irqrestore(&de620_lock, flags); |
| 534 | return NETDEV_TX_BUSY; |
| 535 | } |
| 536 | de620_write_block(dev, buffer, skb->len, len-skb->len); |
| 537 | |
| 538 | dev->trans_start = jiffies; |
| 539 | if(!(using_txbuf == (TXBF0 | TXBF1))) |
| 540 | netif_wake_queue(dev); |
| 541 | |
| 542 | dev->stats.tx_packets++; |
| 543 | spin_unlock_irqrestore(&de620_lock, flags); |
| 544 | dev_kfree_skb (skb); |
| 545 | return NETDEV_TX_OK; |
| 546 | } |
| 547 | |
| 548 | /***************************************************** |
| 549 | * |
| 550 | * Handle the network interface interrupts. |
| 551 | * |
| 552 | */ |
| 553 | static irqreturn_t |
| 554 | de620_interrupt(int irq_in, void *dev_id) |
| 555 | { |
| 556 | struct net_device *dev = dev_id; |
| 557 | byte irq_status; |
| 558 | int bogus_count = 0; |
| 559 | int again = 0; |
| 560 | |
| 561 | spin_lock(&de620_lock); |
| 562 | |
| 563 | /* Read the status register (_not_ the status port) */ |
| 564 | irq_status = de620_get_register(dev, R_STS); |
| 565 | |
| 566 | pr_debug("de620_interrupt (%2.2X)\n", irq_status); |
| 567 | |
| 568 | if (irq_status & RXGOOD) { |
| 569 | do { |
| 570 | again = de620_rx_intr(dev); |
| 571 | pr_debug("again=%d\n", again); |
| 572 | } |
| 573 | while (again && (++bogus_count < 100)); |
| 574 | } |
| 575 | |
| 576 | if(de620_tx_buffs(dev) != (TXBF0 | TXBF1)) |
| 577 | netif_wake_queue(dev); |
| 578 | |
| 579 | spin_unlock(&de620_lock); |
| 580 | return IRQ_HANDLED; |
| 581 | } |
| 582 | |
| 583 | /************************************** |
| 584 | * |
| 585 | * Get a packet from the adapter |
| 586 | * |
| 587 | * Send it "upstairs" |
| 588 | * |
| 589 | */ |
| 590 | static int de620_rx_intr(struct net_device *dev) |
| 591 | { |
| 592 | struct header_buf { |
| 593 | byte status; |
| 594 | byte Rx_NextPage; |
| 595 | unsigned short Rx_ByteCount; |
| 596 | } header_buf; |
| 597 | struct sk_buff *skb; |
| 598 | int size; |
| 599 | byte *buffer; |
| 600 | byte pagelink; |
| 601 | byte curr_page; |
| 602 | |
| 603 | pr_debug("de620_rx_intr: next_rx_page = %d\n", next_rx_page); |
| 604 | |
| 605 | /* Tell the adapter that we are going to read data, and from where */ |
| 606 | de620_send_command(dev, W_CR | RRN); |
| 607 | de620_set_register(dev, W_RSA1, next_rx_page); |
| 608 | de620_set_register(dev, W_RSA0, 0); |
| 609 | |
| 610 | /* Deep breath, and away we goooooo */ |
| 611 | de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf)); |
| 612 | pr_debug("page status=0x%02x, nextpage=%d, packetsize=%d\n", |
| 613 | header_buf.status, header_buf.Rx_NextPage, |
| 614 | header_buf.Rx_ByteCount); |
| 615 | |
| 616 | /* Plausible page header? */ |
| 617 | pagelink = header_buf.Rx_NextPage; |
| 618 | if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) { |
| 619 | /* Ouch... Forget it! Skip all and start afresh... */ |
| 620 | printk(KERN_WARNING "%s: Ring overrun? Restoring...\n", dev->name); |
| 621 | /* You win some, you lose some. And sometimes plenty... */ |
| 622 | adapter_init(dev); |
| 623 | netif_wake_queue(dev); |
| 624 | dev->stats.rx_over_errors++; |
| 625 | return 0; |
| 626 | } |
| 627 | |
| 628 | /* OK, this look good, so far. Let's see if it's consistent... */ |
| 629 | /* Let's compute the start of the next packet, based on where we are */ |
| 630 | pagelink = next_rx_page + |
| 631 | ((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8); |
| 632 | |
| 633 | /* Are we going to wrap around the page counter? */ |
| 634 | if (pagelink > last_rx_page) |
| 635 | pagelink -= (last_rx_page - first_rx_page + 1); |
| 636 | |
| 637 | /* Is the _computed_ next page number equal to what the adapter says? */ |
| 638 | if (pagelink != header_buf.Rx_NextPage) { |
| 639 | /* Naah, we'll skip this packet. Probably bogus data as well */ |
| 640 | printk(KERN_WARNING "%s: Page link out of sync! Restoring...\n", dev->name); |
| 641 | next_rx_page = header_buf.Rx_NextPage; /* at least a try... */ |
| 642 | de620_send_command(dev, W_DUMMY); |
| 643 | de620_set_register(dev, W_NPRF, next_rx_page); |
| 644 | dev->stats.rx_over_errors++; |
| 645 | return 0; |
| 646 | } |
| 647 | next_rx_page = pagelink; |
| 648 | |
| 649 | size = header_buf.Rx_ByteCount - 4; |
| 650 | if ((size < RUNT) || (GIANT < size)) { |
| 651 | printk(KERN_WARNING "%s: Illegal packet size: %d!\n", dev->name, size); |
| 652 | } |
| 653 | else { /* Good packet? */ |
| 654 | skb = dev_alloc_skb(size+2); |
| 655 | if (skb == NULL) { /* Yeah, but no place to put it... */ |
| 656 | printk(KERN_WARNING "%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size); |
| 657 | dev->stats.rx_dropped++; |
| 658 | } |
| 659 | else { /* Yep! Go get it! */ |
| 660 | skb_reserve(skb,2); /* Align */ |
| 661 | /* skb->data points to the start of sk_buff data area */ |
| 662 | buffer = skb_put(skb,size); |
| 663 | /* copy the packet into the buffer */ |
| 664 | de620_read_block(dev, buffer, size); |
| 665 | pr_debug("Read %d bytes\n", size); |
| 666 | skb->protocol=eth_type_trans(skb,dev); |
| 667 | netif_rx(skb); /* deliver it "upstairs" */ |
| 668 | /* count all receives */ |
| 669 | dev->stats.rx_packets++; |
| 670 | dev->stats.rx_bytes += size; |
| 671 | } |
| 672 | } |
| 673 | |
| 674 | /* Let's peek ahead to see if we have read the last current packet */ |
| 675 | /* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */ |
| 676 | curr_page = de620_get_register(dev, R_CPR); |
| 677 | de620_set_register(dev, W_NPRF, next_rx_page); |
| 678 | pr_debug("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page); |
| 679 | |
| 680 | return (next_rx_page != curr_page); /* That was slightly tricky... */ |
| 681 | } |
| 682 | |
| 683 | /********************************************* |
| 684 | * |
| 685 | * Reset the adapter to a known state |
| 686 | * |
| 687 | */ |
| 688 | static int adapter_init(struct net_device *dev) |
| 689 | { |
| 690 | int i; |
| 691 | static int was_down; |
| 692 | |
| 693 | if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */ |
| 694 | EIPRegister = NCTL0; |
| 695 | if (nic_data.Media != 1) |
| 696 | EIPRegister |= NIS0; /* not BNC */ |
| 697 | } |
| 698 | else if (nic_data.Model == 2) { /* UTP */ |
| 699 | EIPRegister = NCTL0 | NIS0; |
| 700 | } |
| 701 | |
| 702 | if (utp) |
| 703 | EIPRegister = NCTL0 | NIS0; |
| 704 | if (bnc) |
| 705 | EIPRegister = NCTL0; |
| 706 | |
| 707 | de620_send_command(dev, W_CR | RNOP | CLEAR); |
| 708 | de620_send_command(dev, W_CR | RNOP); |
| 709 | |
| 710 | de620_set_register(dev, W_SCR, SCR_DEF); |
| 711 | /* disable recv to wait init */ |
| 712 | de620_set_register(dev, W_TCR, RXOFF); |
| 713 | |
| 714 | /* Set the node ID in the adapter */ |
| 715 | for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */ |
| 716 | de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]); |
| 717 | } |
| 718 | |
| 719 | de620_set_register(dev, W_EIP, EIPRegister); |
| 720 | |
| 721 | next_rx_page = first_rx_page = DE620_RX_START_PAGE; |
| 722 | if (nic_data.RAM_Size) |
| 723 | last_rx_page = nic_data.RAM_Size - 1; |
| 724 | else /* 64k RAM */ |
| 725 | last_rx_page = 255; |
| 726 | |
| 727 | de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/ |
| 728 | de620_set_register(dev, W_EPR, last_rx_page); /* End Page Register */ |
| 729 | de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/ |
| 730 | de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/ |
| 731 | de620_send_command(dev, W_DUMMY); |
| 732 | de620_set_delay(dev); |
| 733 | |
| 734 | /* Final sanity check: Anybody out there? */ |
| 735 | /* Let's hope some bits from the statusregister make a good check */ |
| 736 | #define CHECK_MASK ( 0 | TXSUC | T16 | 0 | RXCRC | RXSHORT | 0 | 0 ) |
| 737 | #define CHECK_OK ( 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 ) |
| 738 | /* success: X 0 0 X 0 0 X X */ |
| 739 | /* ignore: EEDI RXGOOD COLS LNKS*/ |
| 740 | |
| 741 | if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) { |
| 742 | printk(KERN_ERR "%s: Something has happened to the DE-620! Please check it" |
| 743 | #ifdef SHUTDOWN_WHEN_LOST |
| 744 | " and do a new ifconfig" |
| 745 | #endif |
| 746 | "! (%02x)\n", dev->name, i); |
| 747 | #ifdef SHUTDOWN_WHEN_LOST |
| 748 | /* Goodbye, cruel world... */ |
| 749 | dev->flags &= ~IFF_UP; |
| 750 | de620_close(dev); |
| 751 | #endif |
| 752 | was_down = 1; |
| 753 | return 1; /* failed */ |
| 754 | } |
| 755 | if (was_down) { |
| 756 | printk(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name); |
| 757 | was_down = 0; |
| 758 | } |
| 759 | |
| 760 | /* All OK, go ahead... */ |
| 761 | de620_set_register(dev, W_TCR, TCR_DEF); |
| 762 | |
| 763 | return 0; /* all ok */ |
| 764 | } |
| 765 | |
| 766 | static const struct net_device_ops de620_netdev_ops = { |
| 767 | .ndo_open = de620_open, |
| 768 | .ndo_stop = de620_close, |
| 769 | .ndo_start_xmit = de620_start_xmit, |
| 770 | .ndo_tx_timeout = de620_timeout, |
| 771 | .ndo_set_multicast_list = de620_set_multicast_list, |
| 772 | .ndo_change_mtu = eth_change_mtu, |
| 773 | .ndo_set_mac_address = eth_mac_addr, |
| 774 | .ndo_validate_addr = eth_validate_addr, |
| 775 | }; |
| 776 | |
| 777 | /****************************************************************************** |
| 778 | * |
| 779 | * Only start-up code below |
| 780 | * |
| 781 | */ |
| 782 | /**************************************** |
| 783 | * |
| 784 | * Check if there is a DE-620 connected |
| 785 | */ |
| 786 | struct net_device * __init de620_probe(int unit) |
| 787 | { |
| 788 | byte checkbyte = 0xa5; |
| 789 | struct net_device *dev; |
| 790 | int err = -ENOMEM; |
| 791 | int i; |
| 792 | |
| 793 | dev = alloc_etherdev(0); |
| 794 | if (!dev) |
| 795 | goto out; |
| 796 | |
| 797 | spin_lock_init(&de620_lock); |
| 798 | |
| 799 | /* |
| 800 | * This is where the base_addr and irq gets set. |
| 801 | * Tunable at compile-time and insmod-time |
| 802 | */ |
| 803 | dev->base_addr = io; |
| 804 | dev->irq = irq; |
| 805 | |
| 806 | /* allow overriding parameters on command line */ |
| 807 | if (unit >= 0) { |
| 808 | sprintf(dev->name, "eth%d", unit); |
| 809 | netdev_boot_setup_check(dev); |
| 810 | } |
| 811 | |
| 812 | pr_debug("%s", version); |
| 813 | |
| 814 | printk(KERN_INFO "D-Link DE-620 pocket adapter"); |
| 815 | |
| 816 | if (!request_region(dev->base_addr, 3, "de620")) { |
| 817 | printk(" io 0x%3lX, which is busy.\n", dev->base_addr); |
| 818 | err = -EBUSY; |
| 819 | goto out1; |
| 820 | } |
| 821 | |
| 822 | /* Initially, configure basic nibble mode, so we can read the EEPROM */ |
| 823 | NIC_Cmd = DEF_NIC_CMD; |
| 824 | de620_set_register(dev, W_EIP, EIPRegister); |
| 825 | |
| 826 | /* Anybody out there? */ |
| 827 | de620_set_register(dev, W_CPR, checkbyte); |
| 828 | checkbyte = de620_get_register(dev, R_CPR); |
| 829 | |
| 830 | if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) { |
| 831 | printk(" not identified in the printer port\n"); |
| 832 | err = -ENODEV; |
| 833 | goto out2; |
| 834 | } |
| 835 | |
| 836 | /* else, got it! */ |
| 837 | dev->dev_addr[0] = nic_data.NodeID[0]; |
| 838 | for (i = 1; i < ETH_ALEN; i++) { |
| 839 | dev->dev_addr[i] = nic_data.NodeID[i]; |
| 840 | dev->broadcast[i] = 0xff; |
| 841 | } |
| 842 | |
| 843 | printk(", Ethernet Address: %pM", dev->dev_addr); |
| 844 | |
| 845 | printk(" (%dk RAM,", |
| 846 | (nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64); |
| 847 | |
| 848 | if (nic_data.Media == 1) |
| 849 | printk(" BNC)\n"); |
| 850 | else |
| 851 | printk(" UTP)\n"); |
| 852 | |
| 853 | dev->netdev_ops = &de620_netdev_ops; |
| 854 | dev->watchdog_timeo = HZ*2; |
| 855 | |
| 856 | /* base_addr and irq are already set, see above! */ |
| 857 | |
| 858 | /* dump eeprom */ |
| 859 | pr_debug("\nEEPROM contents:\n" |
| 860 | "RAM_Size = 0x%02X\n" |
| 861 | "NodeID = %pM\n" |
| 862 | "Model = %d\n" |
| 863 | "Media = %d\n" |
| 864 | "SCR = 0x%02x\n", nic_data.RAM_Size, nic_data.NodeID, |
| 865 | nic_data.Model, nic_data.Media, nic_data.SCR); |
| 866 | |
| 867 | err = register_netdev(dev); |
| 868 | if (err) |
| 869 | goto out2; |
| 870 | return dev; |
| 871 | |
| 872 | out2: |
| 873 | release_region(dev->base_addr, 3); |
| 874 | out1: |
| 875 | free_netdev(dev); |
| 876 | out: |
| 877 | return ERR_PTR(err); |
| 878 | } |
| 879 | |
| 880 | /********************************** |
| 881 | * |
| 882 | * Read info from on-board EEPROM |
| 883 | * |
| 884 | * Note: Bitwise serial I/O to/from the EEPROM vi the status _register_! |
| 885 | */ |
| 886 | #define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister); |
| 887 | |
| 888 | static unsigned short __init ReadAWord(struct net_device *dev, int from) |
| 889 | { |
| 890 | unsigned short data; |
| 891 | int nbits; |
| 892 | |
| 893 | /* cs [__~~] SET SEND STATE */ |
| 894 | /* di [____] */ |
| 895 | /* sck [_~~_] */ |
| 896 | sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 4); |
| 897 | |
| 898 | /* Send the 9-bit address from where we want to read the 16-bit word */ |
| 899 | for (nbits = 9; nbits > 0; --nbits, from <<= 1) { |
| 900 | if (from & 0x0100) { /* bit set? */ |
| 901 | /* cs [~~~~] SEND 1 */ |
| 902 | /* di [~~~~] */ |
| 903 | /* sck [_~~_] */ |
| 904 | sendit(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6); |
| 905 | } |
| 906 | else { |
| 907 | /* cs [~~~~] SEND 0 */ |
| 908 | /* di [____] */ |
| 909 | /* sck [_~~_] */ |
| 910 | sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4); |
| 911 | } |
| 912 | } |
| 913 | |
| 914 | /* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */ |
| 915 | for (data = 0, nbits = 16; nbits > 0; --nbits) { |
| 916 | /* cs [~~~~] SEND 0 */ |
| 917 | /* di [____] */ |
| 918 | /* sck [_~~_] */ |
| 919 | sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4); |
| 920 | data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7); |
| 921 | } |
| 922 | /* cs [____] RESET SEND STATE */ |
| 923 | /* di [____] */ |
| 924 | /* sck [_~~_] */ |
| 925 | sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0); |
| 926 | |
| 927 | return data; |
| 928 | } |
| 929 | |
| 930 | static int __init read_eeprom(struct net_device *dev) |
| 931 | { |
| 932 | unsigned short wrd; |
| 933 | |
| 934 | /* D-Link Ethernet addresses are in the series 00:80:c8:7X:XX:XX:XX */ |
| 935 | wrd = ReadAWord(dev, 0x1aa); /* bytes 0 + 1 of NodeID */ |
| 936 | if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */ |
| 937 | return -1; /* Nope, not a DE-620 */ |
| 938 | nic_data.NodeID[0] = wrd & 0xff; |
| 939 | nic_data.NodeID[1] = wrd >> 8; |
| 940 | |
| 941 | wrd = ReadAWord(dev, 0x1ab); /* bytes 2 + 3 of NodeID */ |
| 942 | if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */ |
| 943 | return -1; /* Nope, not a DE-620 */ |
| 944 | nic_data.NodeID[2] = wrd & 0xff; |
| 945 | nic_data.NodeID[3] = wrd >> 8; |
| 946 | |
| 947 | wrd = ReadAWord(dev, 0x1ac); /* bytes 4 + 5 of NodeID */ |
| 948 | nic_data.NodeID[4] = wrd & 0xff; |
| 949 | nic_data.NodeID[5] = wrd >> 8; |
| 950 | |
| 951 | wrd = ReadAWord(dev, 0x1ad); /* RAM size in pages (256 bytes). 0 = 64k */ |
| 952 | nic_data.RAM_Size = (wrd >> 8); |
| 953 | |
| 954 | wrd = ReadAWord(dev, 0x1ae); /* hardware model (CT = 3) */ |
| 955 | nic_data.Model = (wrd & 0xff); |
| 956 | |
| 957 | wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */ |
| 958 | nic_data.Media = (wrd & 0xff); |
| 959 | |
| 960 | wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */ |
| 961 | nic_data.SCR = (wrd >> 8); |
| 962 | |
| 963 | return 0; /* no errors */ |
| 964 | } |
| 965 | |
| 966 | /****************************************************************************** |
| 967 | * |
| 968 | * Loadable module skeleton |
| 969 | * |
| 970 | */ |
| 971 | #ifdef MODULE |
| 972 | static struct net_device *de620_dev; |
| 973 | |
| 974 | int __init init_module(void) |
| 975 | { |
| 976 | de620_dev = de620_probe(-1); |
| 977 | if (IS_ERR(de620_dev)) |
| 978 | return PTR_ERR(de620_dev); |
| 979 | return 0; |
| 980 | } |
| 981 | |
| 982 | void cleanup_module(void) |
| 983 | { |
| 984 | unregister_netdev(de620_dev); |
| 985 | release_region(de620_dev->base_addr, 3); |
| 986 | free_netdev(de620_dev); |
| 987 | } |
| 988 | #endif /* MODULE */ |
| 989 | MODULE_LICENSE("GPL"); |