root/drivers/net/de600.c

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DEFINITIONS

This source file includes following definitions.
  1. de600_read_status
  2. de600_read_byte
  3. de600_open
  4. de600_close
  5. get_stats
  6. trigger_interrupt
  7. de600_start_xmit
  8. de600_interrupt
  9. de600_tx_intr
  10. de600_rx_intr
  11. de600_probe
  12. adapter_init
  13. de600_rspace
  14. init_module
  15. cleanup_module

   1 static const char *version =
   2         "de600.c: $Revision: 1.40 $,  Bjorn Ekwall (bj0rn@blox.se)\n";
   3 /*
   4  *      de600.c
   5  *
   6  *      Linux driver for the D-Link DE-600 Ethernet pocket adapter.
   7  *
   8  *      Portions (C) Copyright 1993, 1994 by Bjorn Ekwall
   9  *      The Author may be reached as bj0rn@blox.se
  10  *
  11  *      Based on adapter information gathered from DE600.ASM by D-Link Inc.,
  12  *      as included on disk C in the v.2.11 of PC/TCP from FTP Software.
  13  *      For DE600.asm:
  14  *              Portions (C) Copyright 1990 D-Link, Inc.
  15  *              Copyright, 1988-1992, Russell Nelson, Crynwr Software
  16  *
  17  *      Adapted to the sample network driver core for linux,
  18  *      written by: Donald Becker <becker@super.org>
  19  *      C/O Supercomputing Research Ctr., 17100 Science Dr., Bowie MD 20715
  20  *
  21  *      compile-command:
  22  *      "gcc -D__KERNEL__  -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer \
  23  *       -m486 -c de600.c
  24  *
  25  **************************************************************/
  26 /*
  27  *      This program is free software; you can redistribute it and/or modify
  28  *      it under the terms of the GNU General Public License as published by
  29  *      the Free Software Foundation; either version 2, or (at your option)
  30  *      any later version.
  31  *
  32  *      This program is distributed in the hope that it will be useful,
  33  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  34  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  35  *      GNU General Public License for more details.
  36  *
  37  *      You should have received a copy of the GNU General Public License
  38  *      along with this program; if not, write to the Free Software
  39  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
  40  *
  41  **************************************************************/
  42 /* Add another "; SLOW_DOWN_IO" here if your adapter won't work OK: */
  43 #define DE600_SLOW_DOWN SLOW_DOWN_IO; SLOW_DOWN_IO; SLOW_DOWN_IO
  44 
  45  /*
  46  * If you still have trouble reading/writing to the adapter,
  47  * modify the following "#define": (see <asm/io.h> for more info)
  48 #define REALLY_SLOW_IO
  49  */
  50 #define SLOW_IO_BY_JUMPING /* Looks "better" than dummy write to port 0x80 :-) */
  51 
  52 /*
  53  * If you want to enable automatic continuous checking for the DE600,
  54  * keep this #define enabled.
  55  * It doesn't cost much per packet, so I think it is worth it!
  56  * If you disagree, comment away the #define, and live with it...
  57  *
  58  */
  59 #define CHECK_LOST_DE600
  60 
  61 /*
  62  * Enable this #define if you want the adapter to do a "ifconfig down" on
  63  * itself when we have detected that something is possibly wrong with it.
  64  * The default behaviour is to retry with "adapter_init()" until success.
  65  * This should be used for debugging purposes only.
  66  * (Depends on the CHECK_LOST_DE600 above)
  67  *
  68  */
  69 #define SHUTDOWN_WHEN_LOST
  70 
  71 /*
  72  * See comment at "de600_rspace()"!
  73  * This is an *ugly* hack, but for now it achieves its goal of
  74  * faking a TCP flow-control that will not flood the poor DE600.
  75  *
  76  * Tricks TCP to announce a small max window (max 2 fast packets please :-)
  77  *
  78  * Comment away at your own risk!
  79  *
  80  * Update: Use the more general per-device maxwindow parameter instead.
  81  */
  82 #undef FAKE_SMALL_MAX
  83 
  84 /* use 0 for production, 1 for verification, >2 for debug */
  85 #ifdef DE600_DEBUG
  86 #define PRINTK(x) if (de600_debug >= 2) printk x
  87 #else
  88 #define DE600_DEBUG 0
  89 #define PRINTK(x) /**/
  90 #endif
  91 unsigned int de600_debug = DE600_DEBUG;
  92 
  93 #include <linux/module.h>
  94 
  95 #include <linux/kernel.h>
  96 #include <linux/sched.h>
  97 #include <linux/types.h>
  98 #include <linux/fcntl.h>
  99 #include <linux/string.h>
 100 #include <linux/interrupt.h>
 101 #include <linux/ioport.h>
 102 #include <asm/io.h>
 103 #include <linux/in.h>
 104 #include <linux/ptrace.h>
 105 #include <asm/system.h>
 106 #include <linux/errno.h>
 107 
 108 #include <linux/inet.h>
 109 #include <linux/netdevice.h>
 110 #include <linux/etherdevice.h>
 111 #include <linux/skbuff.h>
 112 
 113 #ifdef FAKE_SMALL_MAX
 114 static unsigned long de600_rspace(struct sock *sk);
 115 #include <net/sock.h>
 116 #endif
 117 
 118 #define netstats enet_statistics
 119 typedef unsigned char byte;
 120 
 121 /**************************************************
 122  *                                                *
 123  * Definition of D-Link Ethernet Pocket adapter   *
 124  *                                                *
 125  **************************************************/
 126 /*
 127  * D-Link Ethernet pocket adapter ports
 128  */
 129 /*
 130  * OK, so I'm cheating, but there are an awful lot of
 131  * reads and writes in order to get anything in and out
 132  * of the DE-600 with 4 bits at a time in the parallel port,
 133  * so every saved instruction really helps :-)
 134  *
 135  * That is, I don't care what the device struct says
 136  * but hope that Space.c will keep the rest of the drivers happy.
 137  */
 138 #ifndef DE600_IO
 139 #define DE600_IO 0x378
 140 #endif
 141 
 142 #define DATA_PORT       (DE600_IO)
 143 #define STATUS_PORT     (DE600_IO + 1)
 144 #define COMMAND_PORT    (DE600_IO + 2)
 145 
 146 #ifndef DE600_IRQ
 147 #define DE600_IRQ       7
 148 #endif
 149 /*
 150  * It really should look like this, and autoprobing as well...
 151  *
 152 #define DATA_PORT       (dev->base_addr + 0)
 153 #define STATUS_PORT     (dev->base_addr + 1)
 154 #define COMMAND_PORT    (dev->base_addr + 2)
 155 #define DE600_IRQ       dev->irq
 156  */
 157 
 158 /*
 159  * D-Link COMMAND_PORT commands
 160  */
 161 #define SELECT_NIC      0x04 /* select Network Interface Card */
 162 #define SELECT_PRN      0x1c /* select Printer */
 163 #define NML_PRN         0xec /* normal Printer situation */
 164 #define IRQEN           0x10 /* enable IRQ line */
 165 
 166 /*
 167  * D-Link STATUS_PORT
 168  */
 169 #define RX_BUSY         0x80
 170 #define RX_GOOD         0x40
 171 #define TX_FAILED16     0x10
 172 #define TX_BUSY         0x08
 173 
 174 /*
 175  * D-Link DATA_PORT commands
 176  * command in low 4 bits
 177  * data in high 4 bits
 178  * select current data nibble with HI_NIBBLE bit
 179  */
 180 #define WRITE_DATA      0x00 /* write memory */
 181 #define READ_DATA       0x01 /* read memory */
 182 #define STATUS          0x02 /* read  status register */
 183 #define COMMAND         0x03 /* write command register (see COMMAND below) */
 184 #define NULL_COMMAND    0x04 /* null command */
 185 #define RX_LEN          0x05 /* read  received packet length */
 186 #define TX_ADDR         0x06 /* set adapter transmit memory address */
 187 #define RW_ADDR         0x07 /* set adapter read/write memory address */
 188 #define HI_NIBBLE       0x08 /* read/write the high nibble of data,
 189                                 or-ed with rest of command */
 190 
 191 /*
 192  * command register, accessed through DATA_PORT with low bits = COMMAND
 193  */
 194 #define RX_ALL          0x01 /* PROMISCUOUS */
 195 #define RX_BP           0x02 /* default: BROADCAST & PHYSICAL ADDRESS */
 196 #define RX_MBP          0x03 /* MULTICAST, BROADCAST & PHYSICAL ADDRESS */
 197 
 198 #define TX_ENABLE       0x04 /* bit 2 */
 199 #define RX_ENABLE       0x08 /* bit 3 */
 200 
 201 #define RESET           0x80 /* set bit 7 high */
 202 #define STOP_RESET      0x00 /* set bit 7 low */
 203 
 204 /*
 205  * data to command register
 206  * (high 4 bits in write to DATA_PORT)
 207  */
 208 #define RX_PAGE2_SELECT 0x10 /* bit 4, only 2 pages to select */
 209 #define RX_BASE_PAGE    0x20 /* bit 5, always set when specifying RX_ADDR */
 210 #define FLIP_IRQ        0x40 /* bit 6 */
 211 
 212 /*
 213  * D-Link adapter internal memory:
 214  *
 215  * 0-2K 1:st transmit page (send from pointer up to 2K)
 216  * 2-4K 2:nd transmit page (send from pointer up to 4K)
 217  *
 218  * 4-6K 1:st receive page (data from 4K upwards)
 219  * 6-8K 2:nd receive page (data from 6K upwards)
 220  *
 221  * 8K+  Adapter ROM (contains magic code and last 3 bytes of Ethernet address)
 222  */
 223 #define MEM_2K          0x0800 /* 2048 */
 224 #define MEM_4K          0x1000 /* 4096 */
 225 #define MEM_6K          0x1800 /* 6144 */
 226 #define NODE_ADDRESS    0x2000 /* 8192 */
 227 
 228 #define RUNT 60         /* Too small Ethernet packet */
 229 
 230 /**************************************************
 231  *                                                *
 232  *             End of definition                  *
 233  *                                                *
 234  **************************************************/
 235 
 236 /*
 237  * Index to functions, as function prototypes.
 238  */
 239 /* Routines used internally. (See "convenience macros") */
 240 static byte     de600_read_status(struct device *dev);
 241 static byte     de600_read_byte(unsigned char type, struct device *dev);
 242 
 243 /* Put in the device structure. */
 244 static int      de600_open(struct device *dev);
 245 static int      de600_close(struct device *dev);
 246 static struct netstats *get_stats(struct device *dev);
 247 static int      de600_start_xmit(struct sk_buff *skb, struct device *dev);
 248 
 249 /* Dispatch from interrupts. */
 250 static void     de600_interrupt(int irq, void *dev_id, struct pt_regs *regs);
 251 static int      de600_tx_intr(struct device *dev, int irq_status);
 252 static void     de600_rx_intr(struct device *dev);
 253 
 254 /* Initialization */
 255 static void     trigger_interrupt(struct device *dev);
 256 int             de600_probe(struct device *dev);
 257 static int      adapter_init(struct device *dev);
 258 
 259 /*
 260  * D-Link driver variables:
 261  */
 262 static volatile int             rx_page         = 0;
 263 
 264 #define TX_PAGES 2
 265 static volatile int             tx_fifo[TX_PAGES];
 266 static volatile int             tx_fifo_in = 0;
 267 static volatile int             tx_fifo_out = 0;
 268 static volatile int             free_tx_pages = TX_PAGES;
 269 static int                      was_down = 0;
 270 
 271 /*
 272  * Convenience macros/functions for D-Link adapter
 273  */
 274 
 275 #define select_prn() outb_p(SELECT_PRN, COMMAND_PORT); DE600_SLOW_DOWN
 276 #define select_nic() outb_p(SELECT_NIC, COMMAND_PORT); DE600_SLOW_DOWN
 277 
 278 /* Thanks for hints from Mark Burton <markb@ordern.demon.co.uk> */
 279 #define de600_put_byte(data) ( \
 280         outb_p(((data) << 4)   | WRITE_DATA            , DATA_PORT), \
 281         outb_p(((data) & 0xf0) | WRITE_DATA | HI_NIBBLE, DATA_PORT))
 282 
 283 /*
 284  * The first two outb_p()'s below could perhaps be deleted if there
 285  * would be more delay in the last two. Not certain about it yet...
 286  */
 287 #define de600_put_command(cmd) ( \
 288         outb_p(( rx_page        << 4)   | COMMAND            , DATA_PORT), \
 289         outb_p(( rx_page        & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT), \
 290         outb_p(((rx_page | cmd) << 4)   | COMMAND            , DATA_PORT), \
 291         outb_p(((rx_page | cmd) & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT))
 292 
 293 #define de600_setup_address(addr,type) ( \
 294         outb_p((((addr) << 4) & 0xf0) | type            , DATA_PORT), \
 295         outb_p(( (addr)       & 0xf0) | type | HI_NIBBLE, DATA_PORT), \
 296         outb_p((((addr) >> 4) & 0xf0) | type            , DATA_PORT), \
 297         outb_p((((addr) >> 8) & 0xf0) | type | HI_NIBBLE, DATA_PORT))
 298 
 299 #define rx_page_adr() ((rx_page & RX_PAGE2_SELECT)?(MEM_6K):(MEM_4K))
 300 
 301 /* Flip bit, only 2 pages */
 302 #define next_rx_page() (rx_page ^= RX_PAGE2_SELECT)
 303 
 304 #define tx_page_adr(a) (((a) + 1) * MEM_2K)
 305 
 306 static inline byte
 307 de600_read_status(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 308 {
 309         byte status;
 310 
 311         outb_p(STATUS, DATA_PORT);
 312         status = inb(STATUS_PORT);
 313         outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
 314 
 315         return status;
 316 }
 317 
 318 static inline byte
 319 de600_read_byte(unsigned char type, struct device *dev) { /* dev used by macros */
     /* [previous][next][first][last][top][bottom][index][help] */
 320         byte lo;
 321 
 322         (void)outb_p((type), DATA_PORT);
 323         lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
 324         (void)outb_p((type) | HI_NIBBLE, DATA_PORT);
 325         return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
 326 }
 327 
 328 /*
 329  * Open/initialize the board.  This is called (in the current kernel)
 330  * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
 331  *
 332  * This routine should set everything up anew at each open, even
 333  * registers that "should" only need to be set once at boot, so that
 334  * there is a non-reboot way to recover if something goes wrong.
 335  */
 336 static int
 337 de600_open(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 338 {
 339         if (request_irq(DE600_IRQ, de600_interrupt, 0, "de600", NULL)) {
 340                 printk ("%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
 341                 return 1;
 342         }
 343         irq2dev_map[DE600_IRQ] = dev;
 344 
 345         MOD_INC_USE_COUNT;
 346         dev->start = 1;
 347         if (adapter_init(dev)) {
 348                 return 1;
 349         }
 350 
 351         return 0;
 352 }
 353 
 354 /*
 355  * The inverse routine to de600_open().
 356  */
 357 static int
 358 de600_close(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 359 {
 360         select_nic();
 361         rx_page = 0;
 362         de600_put_command(RESET);
 363         de600_put_command(STOP_RESET);
 364         de600_put_command(0);
 365         select_prn();
 366 
 367         if (dev->start) {
 368                 free_irq(DE600_IRQ, NULL);
 369                 irq2dev_map[DE600_IRQ] = NULL;
 370                 dev->start = 0;
 371                 MOD_DEC_USE_COUNT;
 372         }
 373         return 0;
 374 }
 375 
 376 static struct netstats *
 377 get_stats(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 378 {
 379     return (struct netstats *)(dev->priv);
 380 }
 381 
 382 static inline void
 383 trigger_interrupt(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 384 {
 385         de600_put_command(FLIP_IRQ);
 386         select_prn();
 387         DE600_SLOW_DOWN;
 388         select_nic();
 389         de600_put_command(0);
 390 }
 391 
 392 /*
 393  * Copy a buffer to the adapter transmit page memory.
 394  * Start sending.
 395  */
 396 static int
 397 de600_start_xmit(struct sk_buff *skb, struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 398 {
 399         int     transmit_from;
 400         int     len;
 401         int     tickssofar;
 402         byte    *buffer = skb->data;
 403 
 404         /*
 405          * If some higher layer thinks we've missed a
 406          * tx-done interrupt we are passed NULL.
 407          * Caution: dev_tint() handles the cli()/sti() itself.
 408          */
 409 
 410         if (skb == NULL) {
 411                 dev_tint(dev);
 412                 return 0;
 413         }
 414 
 415         if (free_tx_pages <= 0) {       /* Do timeouts, to avoid hangs. */
 416                 tickssofar = jiffies - dev->trans_start;
 417 
 418                 if (tickssofar < 5)
 419                         return 1;
 420 
 421                 /* else */
 422                 printk("%s: transmit timed out (%d), %s?\n",
 423                         dev->name,
 424                         tickssofar,
 425                         "network cable problem"
 426                         );
 427                 /* Restart the adapter. */
 428                 if (adapter_init(dev)) {
 429                         return 1;
 430                 }
 431         }
 432 
 433         /* Start real output */
 434         PRINTK(("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages));
 435 
 436         if ((len = skb->len) < RUNT)
 437                 len = RUNT;
 438 
 439         cli();
 440         select_nic();
 441         tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
 442         tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
 443 
 444 #ifdef CHECK_LOST_DE600
 445         /* This costs about 40 instructions per packet... */
 446         de600_setup_address(NODE_ADDRESS, RW_ADDR);
 447         de600_read_byte(READ_DATA, dev);
 448         if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
 449                 if (adapter_init(dev)) {
 450                         sti();
 451                         return 1;
 452                 }
 453         }
 454 #endif
 455 
 456         de600_setup_address(transmit_from, RW_ADDR);
 457         for ( ; len > 0; --len, ++buffer)
 458                 de600_put_byte(*buffer);
 459 
 460         if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
 461                 dev->trans_start = jiffies;
 462                 dev->tbusy = 0; /* allow more packets into adapter */
 463                 /* Send page and generate a faked interrupt */
 464                 de600_setup_address(transmit_from, TX_ADDR);
 465                 de600_put_command(TX_ENABLE);
 466         }
 467         else {
 468                 dev->tbusy = !free_tx_pages;
 469                 select_prn();
 470         }
 471         
 472         sti(); /* interrupts back on */
 473         
 474 #ifdef FAKE_SMALL_MAX
 475         /* This will "patch" the socket TCP proto at an early moment */
 476         if (skb->sk && (skb->sk->protocol == IPPROTO_TCP) &&
 477                 (skb->sk->prot->rspace != &de600_rspace))
 478                 skb->sk->prot->rspace = de600_rspace; /* Ugh! */
 479 #endif
 480 
 481         dev_kfree_skb (skb, FREE_WRITE);
 482 
 483         return 0;
 484 }
 485 
 486 /*
 487  * The typical workload of the driver:
 488  * Handle the network interface interrupts.
 489  */
 490 static void
 491 de600_interrupt(int irq, void *dev_id, struct pt_regs * regs)
     /* [previous][next][first][last][top][bottom][index][help] */
 492 {
 493         struct device   *dev = irq2dev_map[irq];
 494         byte            irq_status;
 495         int             retrig = 0;
 496         int             boguscount = 0;
 497 
 498         /* This might just as well be deleted now, no crummy drivers present :-) */
 499         if ((dev == NULL) || (dev->start == 0) || (DE600_IRQ != irq)) {
 500                 printk("%s: bogus interrupt %d\n", dev?dev->name:"DE-600", irq);
 501                 return;
 502         }
 503 
 504         dev->interrupt = 1;
 505         select_nic();
 506         irq_status = de600_read_status(dev);
 507 
 508         do {
 509                 PRINTK(("de600_interrupt (%02X)\n", irq_status));
 510 
 511                 if (irq_status & RX_GOOD)
 512                         de600_rx_intr(dev);
 513                 else if (!(irq_status & RX_BUSY))
 514                         de600_put_command(RX_ENABLE);
 515 
 516                 /* Any transmission in progress? */
 517                 if (free_tx_pages < TX_PAGES)
 518                         retrig = de600_tx_intr(dev, irq_status);
 519                 else
 520                         retrig = 0;
 521 
 522                 irq_status = de600_read_status(dev);
 523         } while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
 524         /*
 525          * Yeah, it _looks_ like busy waiting, smells like busy waiting
 526          * and I know it's not PC, but please, it will only occur once
 527          * in a while and then only for a loop or so (< 1ms for sure!)
 528          */
 529 
 530         /* Enable adapter interrupts */
 531         dev->interrupt = 0;
 532         select_prn();
 533 
 534         if (retrig)
 535                 trigger_interrupt(dev);
 536 
 537         sti();
 538         return;
 539 }
 540 
 541 static int
 542 de600_tx_intr(struct device *dev, int irq_status)
     /* [previous][next][first][last][top][bottom][index][help] */
 543 {
 544         /*
 545          * Returns 1 if tx still not done
 546          */
 547 
 548         mark_bh(NET_BH);
 549         /* Check if current transmission is done yet */
 550         if (irq_status & TX_BUSY)
 551                 return 1; /* tx not done, try again */
 552 
 553         /* else */
 554         /* If last transmission OK then bump fifo index */
 555         if (!(irq_status & TX_FAILED16)) {
 556                 tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
 557                 ++free_tx_pages;
 558                 ((struct netstats *)(dev->priv))->tx_packets++;
 559                 dev->tbusy = 0;
 560         }
 561 
 562         /* More to send, or resend last packet? */
 563         if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
 564                 dev->trans_start = jiffies;
 565                 de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
 566                 de600_put_command(TX_ENABLE);
 567                 return 1;
 568         }
 569         /* else */
 570 
 571         return 0;
 572 }
 573 
 574 /*
 575  * We have a good packet, get it out of the adapter.
 576  */
 577 static void
 578 de600_rx_intr(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 579 {
 580         struct sk_buff  *skb;
 581         int             i;
 582         int             read_from;
 583         int             size;
 584         register unsigned char  *buffer;
 585 
 586         cli();
 587         /* Get size of received packet */
 588         size = de600_read_byte(RX_LEN, dev);    /* low byte */
 589         size += (de600_read_byte(RX_LEN, dev) << 8);    /* high byte */
 590         size -= 4;      /* Ignore trailing 4 CRC-bytes */
 591 
 592         /* Tell adapter where to store next incoming packet, enable receiver */
 593         read_from = rx_page_adr();
 594         next_rx_page();
 595         de600_put_command(RX_ENABLE);
 596         sti();
 597 
 598         if ((size < 32)  ||  (size > 1535)) {
 599                 printk("%s: Bogus packet size %d.\n", dev->name, size);
 600                 if (size > 10000)
 601                         adapter_init(dev);
 602                 return;
 603         }
 604 
 605         skb = dev_alloc_skb(size+2);
 606         sti();
 607         if (skb == NULL) {
 608                 printk("%s: Couldn't allocate a sk_buff of size %d.\n",
 609                         dev->name, size);
 610                 return;
 611         }
 612         /* else */
 613 
 614         skb->dev = dev;
 615         skb_reserve(skb,2);     /* Align */
 616         
 617         /* 'skb->data' points to the start of sk_buff data area. */
 618         buffer = skb_put(skb,size);
 619 
 620         /* copy the packet into the buffer */
 621         de600_setup_address(read_from, RW_ADDR);
 622         for (i = size; i > 0; --i, ++buffer)
 623                 *buffer = de600_read_byte(READ_DATA, dev);
 624         
 625         ((struct netstats *)(dev->priv))->rx_packets++; /* count all receives */
 626 
 627         skb->protocol=eth_type_trans(skb,dev);
 628         
 629         netif_rx(skb);
 630         /*
 631          * If any worth-while packets have been received, netif_rx()
 632          * has done a mark_bh(INET_BH) for us and will work on them
 633          * when we get to the bottom-half routine.
 634          */
 635 }
 636 
 637 int
 638 de600_probe(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 639 {
 640         int     i;
 641         static struct netstats de600_netstats;
 642         /*dev->priv = kmalloc(sizeof(struct netstats), GFP_KERNEL);*/
 643 
 644         printk("%s: D-Link DE-600 pocket adapter", dev->name);
 645         /* Alpha testers must have the version number to report bugs. */
 646         if (de600_debug > 1)
 647                 printk(version);
 648 
 649         /* probe for adapter */
 650         rx_page = 0;
 651         select_nic();
 652         (void)de600_read_status(dev);
 653         de600_put_command(RESET);
 654         de600_put_command(STOP_RESET);
 655         if (de600_read_status(dev) & 0xf0) {
 656                 printk(": not at I/O %#3x.\n", DATA_PORT);
 657                 return ENODEV;
 658         }
 659 
 660         /*
 661          * Maybe we found one,
 662          * have to check if it is a D-Link DE-600 adapter...
 663          */
 664 
 665         /* Get the adapter ethernet address from the ROM */
 666         de600_setup_address(NODE_ADDRESS, RW_ADDR);
 667         for (i = 0; i < ETH_ALEN; i++) {
 668                 dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
 669                 dev->broadcast[i] = 0xff;
 670         }
 671 
 672         /* Check magic code */
 673         if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
 674                 /* OK, install real address */
 675                 dev->dev_addr[0] = 0x00;
 676                 dev->dev_addr[1] = 0x80;
 677                 dev->dev_addr[2] = 0xc8;
 678                 dev->dev_addr[3] &= 0x0f;
 679                 dev->dev_addr[3] |= 0x70;
 680         } else {
 681                 printk(" not identified in the printer port\n");
 682                 return ENODEV;
 683         }
 684 
 685 #if 0 /* Not yet */
 686         if (check_region(DE600_IO, 3)) {
 687                 printk(", port 0x%x busy\n", DE600_IO);
 688                 return EBUSY;
 689         }
 690 #endif
 691         request_region(DE600_IO, 3, "de600");
 692 
 693         printk(", Ethernet Address: %02X", dev->dev_addr[0]);
 694         for (i = 1; i < ETH_ALEN; i++)
 695                 printk(":%02X",dev->dev_addr[i]);
 696         printk("\n");
 697 
 698         /* Initialize the device structure. */
 699         /*dev->priv = kmalloc(sizeof(struct netstats), GFP_KERNEL);*/
 700         dev->priv = &de600_netstats;
 701 
 702         memset(dev->priv, 0, sizeof(struct netstats));
 703         dev->get_stats = get_stats;
 704 
 705         dev->open = de600_open;
 706         dev->stop = de600_close;
 707         dev->hard_start_xmit = &de600_start_xmit;
 708 
 709         ether_setup(dev);
 710         
 711         dev->flags&=~IFF_MULTICAST;
 712         
 713         select_prn();
 714         return 0;
 715 }
 716 
 717 static int
 718 adapter_init(struct device *dev)
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 719 {
 720         int     i;
 721         long flags;
 722 
 723         save_flags(flags);
 724         cli();
 725 
 726         select_nic();
 727         rx_page = 0; /* used by RESET */
 728         de600_put_command(RESET);
 729         de600_put_command(STOP_RESET);
 730 #ifdef CHECK_LOST_DE600
 731         /* Check if it is still there... */
 732         /* Get the some bytes of the adapter ethernet address from the ROM */
 733         de600_setup_address(NODE_ADDRESS, RW_ADDR);
 734         de600_read_byte(READ_DATA, dev);
 735         if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
 736             (de600_read_byte(READ_DATA, dev) != 0x15)) {
 737         /* was: if (de600_read_status(dev) & 0xf0) { */
 738                 printk("Something has happened to the DE-600!  Please check it"
 739 #ifdef SHUTDOWN_WHEN_LOST
 740                         " and do a new ifconfig"
 741 #endif /* SHUTDOWN_WHEN_LOST */
 742                         "!\n");
 743 #ifdef SHUTDOWN_WHEN_LOST
 744                 /* Goodbye, cruel world... */
 745                 dev->flags &= ~IFF_UP;
 746                 de600_close(dev);
 747 #endif /* SHUTDOWN_WHEN_LOST */
 748                 was_down = 1;
 749                 dev->tbusy = 1;         /* Transmit busy...  */
 750                 restore_flags(flags);
 751                 return 1; /* failed */
 752         }
 753 #endif /* CHECK_LOST_DE600 */
 754         if (was_down) {
 755                 printk("Thanks, I feel much better now!\n");
 756                 was_down = 0;
 757         }
 758 
 759         dev->tbusy = 0;         /* Transmit busy...  */
 760         dev->interrupt = 0;
 761         tx_fifo_in = 0;
 762         tx_fifo_out = 0;
 763         free_tx_pages = TX_PAGES;
 764 
 765         /* set the ether address. */
 766         de600_setup_address(NODE_ADDRESS, RW_ADDR);
 767         for (i = 0; i < ETH_ALEN; i++)
 768                 de600_put_byte(dev->dev_addr[i]);
 769 
 770         /* where to start saving incoming packets */
 771         rx_page = RX_BP | RX_BASE_PAGE;
 772         de600_setup_address(MEM_4K, RW_ADDR);
 773         /* Enable receiver */
 774         de600_put_command(RX_ENABLE);
 775         select_prn();
 776         restore_flags(flags);
 777 
 778         return 0; /* OK */
 779 }
 780 
 781 #ifdef FAKE_SMALL_MAX
 782 /*
 783  *      The new router code (coming soon 8-) ) will fix this properly.
 784  */
 785 #define DE600_MIN_WINDOW 1024
 786 #define DE600_MAX_WINDOW 2048
 787 #define DE600_TCP_WINDOW_DIFF 1024
 788 /*
 789  * Copied from "net/inet/sock.c"
 790  *
 791  * Sets a lower max receive window in order to achieve <= 2
 792  * packets arriving at the adapter in fast succession.
 793  * (No way that a DE-600 can keep up with a net saturated
 794  *  with packets homing in on it :-( )
 795  *
 796  * Since there are only 2 receive buffers in the DE-600
 797  * and it takes some time to copy from the adapter,
 798  * this is absolutely necessary for any TCP performance whatsoever!
 799  *
 800  * Note that the returned window info will never be smaller than
 801  * DE600_MIN_WINDOW, i.e. 1024
 802  * This differs from the standard function, that can return an
 803  * arbitrarily small window!
 804  */
 805 #define min(a,b)        ((a)<(b)?(a):(b))
 806 static unsigned long
 807 de600_rspace(struct sock *sk)
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 808 {
 809   int amt;
 810 
 811   if (sk != NULL) {
 812 /*
 813  * Hack! You might want to play with commenting away the following line,
 814  * if you know what you do!
 815         sk->max_unacked = DE600_MAX_WINDOW - DE600_TCP_WINDOW_DIFF;
 816  */
 817 
 818         if (sk->rmem_alloc >= sk->rcvbuf-2*DE600_MIN_WINDOW) return(0);
 819         amt = min((sk->rcvbuf-sk->rmem_alloc)/2/*-DE600_MIN_WINDOW*/, DE600_MAX_WINDOW);
 820         if (amt < 0) return(0);
 821         return(amt);
 822   }
 823   return(0);
 824 }
 825 #endif
 826 
 827 #ifdef MODULE
 828 static char nullname[8];
 829 static struct device de600_dev = {
 830         nullname, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, de600_probe };
 831 
 832 int
 833 init_module(void)
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 834 {
 835         if (register_netdev(&de600_dev) != 0)
 836                 return -EIO;
 837         return 0;
 838 }
 839 
 840 void
 841 cleanup_module(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 842 {
 843         unregister_netdev(&de600_dev);
 844         release_region(DE600_IO, 3);
 845 }
 846 #endif /* MODULE */
 847 /*
 848  * Local variables:
 849  *  kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de600.c"
 850  *  module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de600.c"
 851  *  compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de600.c"
 852  * End:
 853  */

/* [previous][next][first][last][top][bottom][index][help] */