1 /* atp.c: Attached (pocket) ethernet adapter driver for linux. */ 2 /* 3 This is a driver for commonly OEM pocket (parallel port) 4 ethernet adapters based on the Realtek RTL8002 and RTL8012 chips. 5 6 Written 1993-2000 by Donald Becker. 7 8 This software may be used and distributed according to the terms of 9 the GNU General Public License (GPL), incorporated herein by reference. 10 Drivers based on or derived from this code fall under the GPL and must 11 retain the authorship, copyright and license notice. This file is not 12 a complete program and may only be used when the entire operating 13 system is licensed under the GPL. 14 15 Copyright 1993 United States Government as represented by the Director, 16 National Security Agency. Copyright 1994-2000 retained by the original 17 author, Donald Becker. The timer-based reset code was supplied in 1995 18 by Bill Carlson, wwc@super.org. 19 20 The author may be reached as becker@scyld.com, or C/O 21 Scyld Computing Corporation 22 410 Severn Ave., Suite 210 23 Annapolis MD 21403 24 25 Support information and updates available at 26 http://www.scyld.com/network/atp.html 27 28 29 Modular support/softnet added by Alan Cox. 30 _bit abuse fixed up by Alan Cox 31 32 */ 33 34 static const char version[] = 35 "atp.c:v1.09=ac 2002/10/01 Donald Becker <becker@scyld.com>\n"; 36 37 /* The user-configurable values. 38 These may be modified when a driver module is loaded.*/ 39 40 static int debug = 1; /* 1 normal messages, 0 quiet .. 7 verbose. */ 41 #define net_debug debug 42 43 /* Maximum events (Rx packets, etc.) to handle at each interrupt. */ 44 static int max_interrupt_work = 15; 45 46 #define NUM_UNITS 2 47 /* The standard set of ISA module parameters. */ 48 static int io[NUM_UNITS]; 49 static int irq[NUM_UNITS]; 50 static int xcvr[NUM_UNITS]; /* The data transfer mode. */ 51 52 /* Operational parameters that are set at compile time. */ 53 54 /* Time in jiffies before concluding the transmitter is hung. */ 55 #define TX_TIMEOUT (400*HZ/1000) 56 57 /* 58 This file is a device driver for the RealTek (aka AT-Lan-Tec) pocket 59 ethernet adapter. This is a common low-cost OEM pocket ethernet 60 adapter, sold under many names. 61 62 Sources: 63 This driver was written from the packet driver assembly code provided by 64 Vincent Bono of AT-Lan-Tec. Ever try to figure out how a complicated 65 device works just from the assembly code? It ain't pretty. The following 66 description is written based on guesses and writing lots of special-purpose 67 code to test my theorized operation. 68 69 In 1997 Realtek made available the documentation for the second generation 70 RTL8012 chip, which has lead to several driver improvements. 71 http://www.realtek.com.tw/ 72 73 Theory of Operation 74 75 The RTL8002 adapter seems to be built around a custom spin of the SEEQ 76 controller core. It probably has a 16K or 64K internal packet buffer, of 77 which the first 4K is devoted to transmit and the rest to receive. 78 The controller maintains the queue of received packet and the packet buffer 79 access pointer internally, with only 'reset to beginning' and 'skip to next 80 packet' commands visible. The transmit packet queue holds two (or more?) 81 packets: both 'retransmit this packet' (due to collision) and 'transmit next 82 packet' commands must be started by hand. 83 84 The station address is stored in a standard bit-serial EEPROM which must be 85 read (ughh) by the device driver. (Provisions have been made for 86 substituting a 74S288 PROM, but I haven't gotten reports of any models 87 using it.) Unlike built-in devices, a pocket adapter can temporarily lose 88 power without indication to the device driver. The major effect is that 89 the station address, receive filter (promiscuous, etc.) and transceiver 90 must be reset. 91 92 The controller itself has 16 registers, some of which use only the lower 93 bits. The registers are read and written 4 bits at a time. The four bit 94 register address is presented on the data lines along with a few additional 95 timing and control bits. The data is then read from status port or written 96 to the data port. 97 98 Correction: the controller has two banks of 16 registers. The second 99 bank contains only the multicast filter table (now used) and the EEPROM 100 access registers. 101 102 Since the bulk data transfer of the actual packets through the slow 103 parallel port dominates the driver's running time, four distinct data 104 (non-register) transfer modes are provided by the adapter, two in each 105 direction. In the first mode timing for the nibble transfers is 106 provided through the data port. In the second mode the same timing is 107 provided through the control port. In either case the data is read from 108 the status port and written to the data port, just as it is accessing 109 registers. 110 111 In addition to the basic data transfer methods, several more are modes are 112 created by adding some delay by doing multiple reads of the data to allow 113 it to stabilize. This delay seems to be needed on most machines. 114 115 The data transfer mode is stored in the 'dev->if_port' field. Its default 116 value is '4'. It may be overridden at boot-time using the third parameter 117 to the "ether=..." initialization. 118 119 The header file <atp.h> provides inline functions that encapsulate the 120 register and data access methods. These functions are hand-tuned to 121 generate reasonable object code. This header file also documents my 122 interpretations of the device registers. 123 */ 124 125 #include <linux/kernel.h> 126 #include <linux/module.h> 127 #include <linux/types.h> 128 #include <linux/fcntl.h> 129 #include <linux/interrupt.h> 130 #include <linux/ioport.h> 131 #include <linux/in.h> 132 #include <linux/string.h> 133 #include <linux/errno.h> 134 #include <linux/init.h> 135 #include <linux/crc32.h> 136 #include <linux/netdevice.h> 137 #include <linux/etherdevice.h> 138 #include <linux/skbuff.h> 139 #include <linux/spinlock.h> 140 #include <linux/delay.h> 141 #include <linux/bitops.h> 142 143 #include <asm/io.h> 144 #include <asm/dma.h> 145 146 #include "atp.h" 147 148 MODULE_AUTHOR("Donald Becker <becker@scyld.com>"); 149 MODULE_DESCRIPTION("RealTek RTL8002/8012 parallel port Ethernet driver"); 150 MODULE_LICENSE("GPL"); 151 152 module_param(max_interrupt_work, int, 0); 153 module_param(debug, int, 0); 154 module_param_array(io, int, NULL, 0); 155 module_param_array(irq, int, NULL, 0); 156 module_param_array(xcvr, int, NULL, 0); 157 MODULE_PARM_DESC(max_interrupt_work, "ATP maximum events handled per interrupt"); 158 MODULE_PARM_DESC(debug, "ATP debug level (0-7)"); 159 MODULE_PARM_DESC(io, "ATP I/O base address(es)"); 160 MODULE_PARM_DESC(irq, "ATP IRQ number(s)"); 161 MODULE_PARM_DESC(xcvr, "ATP transceiver(s) (0=internal, 1=external)"); 162 163 /* The number of low I/O ports used by the ethercard. */ 164 #define ETHERCARD_TOTAL_SIZE 3 165 166 /* Sequence to switch an 8012 from printer mux to ethernet mode. */ 167 static char mux_8012[] = { 0xff, 0xf7, 0xff, 0xfb, 0xf3, 0xfb, 0xff, 0xf7,}; 168 169 struct net_local { 170 spinlock_t lock; 171 struct net_device *next_module; 172 struct timer_list timer; /* Media selection timer. */ 173 long last_rx_time; /* Last Rx, in jiffies, to handle Rx hang. */ 174 int saved_tx_size; 175 unsigned int tx_unit_busy:1; 176 unsigned char re_tx, /* Number of packet retransmissions. */ 177 addr_mode, /* Current Rx filter e.g. promiscuous, etc. */ 178 pac_cnt_in_tx_buf; 179 }; 180 181 /* This code, written by wwc@super.org, resets the adapter every 182 TIMED_CHECKER ticks. This recovers from an unknown error which 183 hangs the device. */ 184 #define TIMED_CHECKER (HZ/4) 185 #ifdef TIMED_CHECKER 186 #include <linux/timer.h> 187 static void atp_timed_checker(unsigned long ignored); 188 #endif 189 190 /* Index to functions, as function prototypes. */ 191 192 static int atp_probe1(long ioaddr); 193 static void get_node_ID(struct net_device *dev); 194 static unsigned short eeprom_op(long ioaddr, unsigned int cmd); 195 static int net_open(struct net_device *dev); 196 static void hardware_init(struct net_device *dev); 197 static void write_packet(long ioaddr, int length, unsigned char *packet, int pad, int mode); 198 static void trigger_send(long ioaddr, int length); 199 static netdev_tx_t atp_send_packet(struct sk_buff *skb, 200 struct net_device *dev); 201 static irqreturn_t atp_interrupt(int irq, void *dev_id); 202 static void net_rx(struct net_device *dev); 203 static void read_block(long ioaddr, int length, unsigned char *buffer, int data_mode); 204 static int net_close(struct net_device *dev); 205 static void set_rx_mode(struct net_device *dev); 206 static void tx_timeout(struct net_device *dev); 207 208 209 /* A list of all installed ATP devices, for removing the driver module. */ 210 static struct net_device *root_atp_dev; 211 212 /* Check for a network adapter of this type, and return '0' iff one exists. 213 If dev->base_addr == 0, probe all likely locations. 214 If dev->base_addr == 1, always return failure. 215 If dev->base_addr == 2, allocate space for the device and return success 216 (detachable devices only). 217 218 FIXME: we should use the parport layer for this 219 */ 220 static int __init atp_init(void) 221 { 222 int *port, ports[] = {0x378, 0x278, 0x3bc, 0}; 223 int base_addr = io[0]; 224 225 if (base_addr > 0x1ff) /* Check a single specified location. */ 226 return atp_probe1(base_addr); 227 else if (base_addr == 1) /* Don't probe at all. */ 228 return -ENXIO; 229 230 for (port = ports; *port; port++) { 231 long ioaddr = *port; 232 outb(0x57, ioaddr + PAR_DATA); 233 if (inb(ioaddr + PAR_DATA) != 0x57) 234 continue; 235 if (atp_probe1(ioaddr) == 0) 236 return 0; 237 } 238 239 return -ENODEV; 240 } 241 242 static const struct net_device_ops atp_netdev_ops = { 243 .ndo_open = net_open, 244 .ndo_stop = net_close, 245 .ndo_start_xmit = atp_send_packet, 246 .ndo_set_rx_mode = set_rx_mode, 247 .ndo_tx_timeout = tx_timeout, 248 .ndo_change_mtu = eth_change_mtu, 249 .ndo_set_mac_address = eth_mac_addr, 250 .ndo_validate_addr = eth_validate_addr, 251 }; 252 253 static int __init atp_probe1(long ioaddr) 254 { 255 struct net_device *dev = NULL; 256 struct net_local *lp; 257 int saved_ctrl_reg, status, i; 258 int res; 259 260 outb(0xff, ioaddr + PAR_DATA); 261 /* Save the original value of the Control register, in case we guessed 262 wrong. */ 263 saved_ctrl_reg = inb(ioaddr + PAR_CONTROL); 264 if (net_debug > 3) 265 printk("atp: Control register was %#2.2x.\n", saved_ctrl_reg); 266 /* IRQEN=0, SLCTB=high INITB=high, AUTOFDB=high, STBB=high. */ 267 outb(0x04, ioaddr + PAR_CONTROL); 268 #ifndef final_version 269 if (net_debug > 3) { 270 /* Turn off the printer multiplexer on the 8012. */ 271 for (i = 0; i < 8; i++) 272 outb(mux_8012[i], ioaddr + PAR_DATA); 273 write_reg(ioaddr, MODSEL, 0x00); 274 printk("atp: Registers are "); 275 for (i = 0; i < 32; i++) 276 printk(" %2.2x", read_nibble(ioaddr, i)); 277 printk(".\n"); 278 } 279 #endif 280 /* Turn off the printer multiplexer on the 8012. */ 281 for (i = 0; i < 8; i++) 282 outb(mux_8012[i], ioaddr + PAR_DATA); 283 write_reg_high(ioaddr, CMR1, CMR1h_RESET); 284 /* udelay() here? */ 285 status = read_nibble(ioaddr, CMR1); 286 287 if (net_debug > 3) { 288 printk(KERN_DEBUG "atp: Status nibble was %#2.2x..", status); 289 for (i = 0; i < 32; i++) 290 printk(" %2.2x", read_nibble(ioaddr, i)); 291 printk("\n"); 292 } 293 294 if ((status & 0x78) != 0x08) { 295 /* The pocket adapter probe failed, restore the control register. */ 296 outb(saved_ctrl_reg, ioaddr + PAR_CONTROL); 297 return -ENODEV; 298 } 299 status = read_nibble(ioaddr, CMR2_h); 300 if ((status & 0x78) != 0x10) { 301 outb(saved_ctrl_reg, ioaddr + PAR_CONTROL); 302 return -ENODEV; 303 } 304 305 dev = alloc_etherdev(sizeof(struct net_local)); 306 if (!dev) 307 return -ENOMEM; 308 309 /* Find the IRQ used by triggering an interrupt. */ 310 write_reg_byte(ioaddr, CMR2, 0x01); /* No accept mode, IRQ out. */ 311 write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); /* Enable Tx and Rx. */ 312 313 /* Omit autoIRQ routine for now. Use "table lookup" instead. Uhgggh. */ 314 if (irq[0]) 315 dev->irq = irq[0]; 316 else if (ioaddr == 0x378) 317 dev->irq = 7; 318 else 319 dev->irq = 5; 320 write_reg_high(ioaddr, CMR1, CMR1h_TxRxOFF); /* Disable Tx and Rx units. */ 321 write_reg(ioaddr, CMR2, CMR2_NULL); 322 323 dev->base_addr = ioaddr; 324 325 /* Read the station address PROM. */ 326 get_node_ID(dev); 327 328 #ifndef MODULE 329 if (net_debug) 330 printk(KERN_INFO "%s", version); 331 #endif 332 333 printk(KERN_NOTICE "%s: Pocket adapter found at %#3lx, IRQ %d, " 334 "SAPROM %pM.\n", 335 dev->name, dev->base_addr, dev->irq, dev->dev_addr); 336 337 /* Reset the ethernet hardware and activate the printer pass-through. */ 338 write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX); 339 340 lp = netdev_priv(dev); 341 lp->addr_mode = CMR2h_Normal; 342 spin_lock_init(&lp->lock); 343 344 /* For the ATP adapter the "if_port" is really the data transfer mode. */ 345 if (xcvr[0]) 346 dev->if_port = xcvr[0]; 347 else 348 dev->if_port = (dev->mem_start & 0xf) ? (dev->mem_start & 0x7) : 4; 349 if (dev->mem_end & 0xf) 350 net_debug = dev->mem_end & 7; 351 352 dev->netdev_ops = &atp_netdev_ops; 353 dev->watchdog_timeo = TX_TIMEOUT; 354 355 res = register_netdev(dev); 356 if (res) { 357 free_netdev(dev); 358 return res; 359 } 360 361 lp->next_module = root_atp_dev; 362 root_atp_dev = dev; 363 364 return 0; 365 } 366 367 /* Read the station address PROM, usually a word-wide EEPROM. */ 368 static void __init get_node_ID(struct net_device *dev) 369 { 370 long ioaddr = dev->base_addr; 371 int sa_offset = 0; 372 int i; 373 374 write_reg(ioaddr, CMR2, CMR2_EEPROM); /* Point to the EEPROM control registers. */ 375 376 /* Some adapters have the station address at offset 15 instead of offset 377 zero. Check for it, and fix it if needed. */ 378 if (eeprom_op(ioaddr, EE_READ(0)) == 0xffff) 379 sa_offset = 15; 380 381 for (i = 0; i < 3; i++) 382 ((__be16 *)dev->dev_addr)[i] = 383 cpu_to_be16(eeprom_op(ioaddr, EE_READ(sa_offset + i))); 384 385 write_reg(ioaddr, CMR2, CMR2_NULL); 386 } 387 388 /* 389 An EEPROM read command starts by shifting out 0x60+address, and then 390 shifting in the serial data. See the NatSemi databook for details. 391 * ________________ 392 * CS : __| 393 * ___ ___ 394 * CLK: ______| |___| | 395 * __ _______ _______ 396 * DI : __X_______X_______X 397 * DO : _________X_______X 398 */ 399 400 static unsigned short __init eeprom_op(long ioaddr, u32 cmd) 401 { 402 unsigned eedata_out = 0; 403 int num_bits = EE_CMD_SIZE; 404 405 while (--num_bits >= 0) { 406 char outval = (cmd & (1<<num_bits)) ? EE_DATA_WRITE : 0; 407 write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_LOW); 408 write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_HIGH); 409 eedata_out <<= 1; 410 if (read_nibble(ioaddr, PROM_DATA) & EE_DATA_READ) 411 eedata_out++; 412 } 413 write_reg_high(ioaddr, PROM_CMD, EE_CLK_LOW & ~EE_CS); 414 return eedata_out; 415 } 416 417 418 /* Open/initialize the board. This is called (in the current kernel) 419 sometime after booting when the 'ifconfig' program is run. 420 421 This routine sets everything up anew at each open, even 422 registers that "should" only need to be set once at boot, so that 423 there is non-reboot way to recover if something goes wrong. 424 425 This is an attachable device: if there is no private entry then it wasn't 426 probed for at boot-time, and we need to probe for it again. 427 */ 428 static int net_open(struct net_device *dev) 429 { 430 struct net_local *lp = netdev_priv(dev); 431 int ret; 432 433 /* The interrupt line is turned off (tri-stated) when the device isn't in 434 use. That's especially important for "attached" interfaces where the 435 port or interrupt may be shared. */ 436 ret = request_irq(dev->irq, atp_interrupt, 0, dev->name, dev); 437 if (ret) 438 return ret; 439 440 hardware_init(dev); 441 442 init_timer(&lp->timer); 443 lp->timer.expires = jiffies + TIMED_CHECKER; 444 lp->timer.data = (unsigned long)dev; 445 lp->timer.function = atp_timed_checker; /* timer handler */ 446 add_timer(&lp->timer); 447 448 netif_start_queue(dev); 449 return 0; 450 } 451 452 /* This routine resets the hardware. We initialize everything, assuming that 453 the hardware may have been temporarily detached. */ 454 static void hardware_init(struct net_device *dev) 455 { 456 struct net_local *lp = netdev_priv(dev); 457 long ioaddr = dev->base_addr; 458 int i; 459 460 /* Turn off the printer multiplexer on the 8012. */ 461 for (i = 0; i < 8; i++) 462 outb(mux_8012[i], ioaddr + PAR_DATA); 463 write_reg_high(ioaddr, CMR1, CMR1h_RESET); 464 465 for (i = 0; i < 6; i++) 466 write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]); 467 468 write_reg_high(ioaddr, CMR2, lp->addr_mode); 469 470 if (net_debug > 2) { 471 printk(KERN_DEBUG "%s: Reset: current Rx mode %d.\n", dev->name, 472 (read_nibble(ioaddr, CMR2_h) >> 3) & 0x0f); 473 } 474 475 write_reg(ioaddr, CMR2, CMR2_IRQOUT); 476 write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); 477 478 /* Enable the interrupt line from the serial port. */ 479 outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL); 480 481 /* Unmask the interesting interrupts. */ 482 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK); 483 write_reg_high(ioaddr, IMR, ISRh_RxErr); 484 485 lp->tx_unit_busy = 0; 486 lp->pac_cnt_in_tx_buf = 0; 487 lp->saved_tx_size = 0; 488 } 489 490 static void trigger_send(long ioaddr, int length) 491 { 492 write_reg_byte(ioaddr, TxCNT0, length & 0xff); 493 write_reg(ioaddr, TxCNT1, length >> 8); 494 write_reg(ioaddr, CMR1, CMR1_Xmit); 495 } 496 497 static void write_packet(long ioaddr, int length, unsigned char *packet, int pad_len, int data_mode) 498 { 499 if (length & 1) 500 { 501 length++; 502 pad_len++; 503 } 504 505 outb(EOC+MAR, ioaddr + PAR_DATA); 506 if ((data_mode & 1) == 0) { 507 /* Write the packet out, starting with the write addr. */ 508 outb(WrAddr+MAR, ioaddr + PAR_DATA); 509 do { 510 write_byte_mode0(ioaddr, *packet++); 511 } while (--length > pad_len) ; 512 do { 513 write_byte_mode0(ioaddr, 0); 514 } while (--length > 0) ; 515 } else { 516 /* Write the packet out in slow mode. */ 517 unsigned char outbyte = *packet++; 518 519 outb(Ctrl_LNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL); 520 outb(WrAddr+MAR, ioaddr + PAR_DATA); 521 522 outb((outbyte & 0x0f)|0x40, ioaddr + PAR_DATA); 523 outb(outbyte & 0x0f, ioaddr + PAR_DATA); 524 outbyte >>= 4; 525 outb(outbyte & 0x0f, ioaddr + PAR_DATA); 526 outb(Ctrl_HNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL); 527 while (--length > pad_len) 528 write_byte_mode1(ioaddr, *packet++); 529 while (--length > 0) 530 write_byte_mode1(ioaddr, 0); 531 } 532 /* Terminate the Tx frame. End of write: ECB. */ 533 outb(0xff, ioaddr + PAR_DATA); 534 outb(Ctrl_HNibWrite | Ctrl_SelData | Ctrl_IRQEN, ioaddr + PAR_CONTROL); 535 } 536 537 static void tx_timeout(struct net_device *dev) 538 { 539 long ioaddr = dev->base_addr; 540 541 printk(KERN_WARNING "%s: Transmit timed out, %s?\n", dev->name, 542 inb(ioaddr + PAR_CONTROL) & 0x10 ? "network cable problem" 543 : "IRQ conflict"); 544 dev->stats.tx_errors++; 545 /* Try to restart the adapter. */ 546 hardware_init(dev); 547 dev->trans_start = jiffies; /* prevent tx timeout */ 548 netif_wake_queue(dev); 549 dev->stats.tx_errors++; 550 } 551 552 static netdev_tx_t atp_send_packet(struct sk_buff *skb, 553 struct net_device *dev) 554 { 555 struct net_local *lp = netdev_priv(dev); 556 long ioaddr = dev->base_addr; 557 int length; 558 unsigned long flags; 559 560 length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN; 561 562 netif_stop_queue(dev); 563 564 /* Disable interrupts by writing 0x00 to the Interrupt Mask Register. 565 This sequence must not be interrupted by an incoming packet. */ 566 567 spin_lock_irqsave(&lp->lock, flags); 568 write_reg(ioaddr, IMR, 0); 569 write_reg_high(ioaddr, IMR, 0); 570 spin_unlock_irqrestore(&lp->lock, flags); 571 572 write_packet(ioaddr, length, skb->data, length-skb->len, dev->if_port); 573 574 lp->pac_cnt_in_tx_buf++; 575 if (lp->tx_unit_busy == 0) { 576 trigger_send(ioaddr, length); 577 lp->saved_tx_size = 0; /* Redundant */ 578 lp->re_tx = 0; 579 lp->tx_unit_busy = 1; 580 } else 581 lp->saved_tx_size = length; 582 /* Re-enable the LPT interrupts. */ 583 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK); 584 write_reg_high(ioaddr, IMR, ISRh_RxErr); 585 586 dev_kfree_skb (skb); 587 return NETDEV_TX_OK; 588 } 589 590 591 /* The typical workload of the driver: 592 Handle the network interface interrupts. */ 593 static irqreturn_t atp_interrupt(int irq, void *dev_instance) 594 { 595 struct net_device *dev = dev_instance; 596 struct net_local *lp; 597 long ioaddr; 598 static int num_tx_since_rx; 599 int boguscount = max_interrupt_work; 600 int handled = 0; 601 602 ioaddr = dev->base_addr; 603 lp = netdev_priv(dev); 604 605 spin_lock(&lp->lock); 606 607 /* Disable additional spurious interrupts. */ 608 outb(Ctrl_SelData, ioaddr + PAR_CONTROL); 609 610 /* The adapter's output is currently the IRQ line, switch it to data. */ 611 write_reg(ioaddr, CMR2, CMR2_NULL); 612 write_reg(ioaddr, IMR, 0); 613 614 if (net_debug > 5) printk(KERN_DEBUG "%s: In interrupt ", dev->name); 615 while (--boguscount > 0) { 616 int status = read_nibble(ioaddr, ISR); 617 if (net_debug > 5) printk("loop status %02x..", status); 618 619 if (status & (ISR_RxOK<<3)) { 620 handled = 1; 621 write_reg(ioaddr, ISR, ISR_RxOK); /* Clear the Rx interrupt. */ 622 do { 623 int read_status = read_nibble(ioaddr, CMR1); 624 if (net_debug > 6) 625 printk("handling Rx packet %02x..", read_status); 626 /* We acknowledged the normal Rx interrupt, so if the interrupt 627 is still outstanding we must have a Rx error. */ 628 if (read_status & (CMR1_IRQ << 3)) { /* Overrun. */ 629 dev->stats.rx_over_errors++; 630 /* Set to no-accept mode long enough to remove a packet. */ 631 write_reg_high(ioaddr, CMR2, CMR2h_OFF); 632 net_rx(dev); 633 /* Clear the interrupt and return to normal Rx mode. */ 634 write_reg_high(ioaddr, ISR, ISRh_RxErr); 635 write_reg_high(ioaddr, CMR2, lp->addr_mode); 636 } else if ((read_status & (CMR1_BufEnb << 3)) == 0) { 637 net_rx(dev); 638 num_tx_since_rx = 0; 639 } else 640 break; 641 } while (--boguscount > 0); 642 } else if (status & ((ISR_TxErr + ISR_TxOK)<<3)) { 643 handled = 1; 644 if (net_debug > 6) printk("handling Tx done.."); 645 /* Clear the Tx interrupt. We should check for too many failures 646 and reinitialize the adapter. */ 647 write_reg(ioaddr, ISR, ISR_TxErr + ISR_TxOK); 648 if (status & (ISR_TxErr<<3)) { 649 dev->stats.collisions++; 650 if (++lp->re_tx > 15) { 651 dev->stats.tx_aborted_errors++; 652 hardware_init(dev); 653 break; 654 } 655 /* Attempt to retransmit. */ 656 if (net_debug > 6) printk("attempting to ReTx"); 657 write_reg(ioaddr, CMR1, CMR1_ReXmit + CMR1_Xmit); 658 } else { 659 /* Finish up the transmit. */ 660 dev->stats.tx_packets++; 661 lp->pac_cnt_in_tx_buf--; 662 if ( lp->saved_tx_size) { 663 trigger_send(ioaddr, lp->saved_tx_size); 664 lp->saved_tx_size = 0; 665 lp->re_tx = 0; 666 } else 667 lp->tx_unit_busy = 0; 668 netif_wake_queue(dev); /* Inform upper layers. */ 669 } 670 num_tx_since_rx++; 671 } else if (num_tx_since_rx > 8 && 672 time_after(jiffies, dev->last_rx + HZ)) { 673 if (net_debug > 2) 674 printk(KERN_DEBUG "%s: Missed packet? No Rx after %d Tx and " 675 "%ld jiffies status %02x CMR1 %02x.\n", dev->name, 676 num_tx_since_rx, jiffies - dev->last_rx, status, 677 (read_nibble(ioaddr, CMR1) >> 3) & 15); 678 dev->stats.rx_missed_errors++; 679 hardware_init(dev); 680 num_tx_since_rx = 0; 681 break; 682 } else 683 break; 684 } 685 686 /* This following code fixes a rare (and very difficult to track down) 687 problem where the adapter forgets its ethernet address. */ 688 { 689 int i; 690 for (i = 0; i < 6; i++) 691 write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]); 692 #if 0 && defined(TIMED_CHECKER) 693 mod_timer(&lp->timer, jiffies + TIMED_CHECKER); 694 #endif 695 } 696 697 /* Tell the adapter that it can go back to using the output line as IRQ. */ 698 write_reg(ioaddr, CMR2, CMR2_IRQOUT); 699 /* Enable the physical interrupt line, which is sure to be low until.. */ 700 outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL); 701 /* .. we enable the interrupt sources. */ 702 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK); 703 write_reg_high(ioaddr, IMR, ISRh_RxErr); /* Hmmm, really needed? */ 704 705 spin_unlock(&lp->lock); 706 707 if (net_debug > 5) printk("exiting interrupt.\n"); 708 return IRQ_RETVAL(handled); 709 } 710 711 #ifdef TIMED_CHECKER 712 /* This following code fixes a rare (and very difficult to track down) 713 problem where the adapter forgets its ethernet address. */ 714 static void atp_timed_checker(unsigned long data) 715 { 716 struct net_device *dev = (struct net_device *)data; 717 long ioaddr = dev->base_addr; 718 struct net_local *lp = netdev_priv(dev); 719 int tickssofar = jiffies - lp->last_rx_time; 720 int i; 721 722 spin_lock(&lp->lock); 723 if (tickssofar > 2*HZ) { 724 #if 1 725 for (i = 0; i < 6; i++) 726 write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]); 727 lp->last_rx_time = jiffies; 728 #else 729 for (i = 0; i < 6; i++) 730 if (read_cmd_byte(ioaddr, PAR0 + i) != atp_timed_dev->dev_addr[i]) 731 { 732 struct net_local *lp = netdev_priv(atp_timed_dev); 733 write_reg_byte(ioaddr, PAR0 + i, atp_timed_dev->dev_addr[i]); 734 if (i == 2) 735 dev->stats.tx_errors++; 736 else if (i == 3) 737 dev->stats.tx_dropped++; 738 else if (i == 4) 739 dev->stats.collisions++; 740 else 741 dev->stats.rx_errors++; 742 } 743 #endif 744 } 745 spin_unlock(&lp->lock); 746 lp->timer.expires = jiffies + TIMED_CHECKER; 747 add_timer(&lp->timer); 748 } 749 #endif 750 751 /* We have a good packet(s), get it/them out of the buffers. */ 752 static void net_rx(struct net_device *dev) 753 { 754 struct net_local *lp = netdev_priv(dev); 755 long ioaddr = dev->base_addr; 756 struct rx_header rx_head; 757 758 /* Process the received packet. */ 759 outb(EOC+MAR, ioaddr + PAR_DATA); 760 read_block(ioaddr, 8, (unsigned char*)&rx_head, dev->if_port); 761 if (net_debug > 5) 762 printk(KERN_DEBUG " rx_count %04x %04x %04x %04x..", rx_head.pad, 763 rx_head.rx_count, rx_head.rx_status, rx_head.cur_addr); 764 if ((rx_head.rx_status & 0x77) != 0x01) { 765 dev->stats.rx_errors++; 766 if (rx_head.rx_status & 0x0004) dev->stats.rx_frame_errors++; 767 else if (rx_head.rx_status & 0x0002) dev->stats.rx_crc_errors++; 768 if (net_debug > 3) 769 printk(KERN_DEBUG "%s: Unknown ATP Rx error %04x.\n", 770 dev->name, rx_head.rx_status); 771 if (rx_head.rx_status & 0x0020) { 772 dev->stats.rx_fifo_errors++; 773 write_reg_high(ioaddr, CMR1, CMR1h_TxENABLE); 774 write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); 775 } else if (rx_head.rx_status & 0x0050) 776 hardware_init(dev); 777 return; 778 } else { 779 /* Malloc up new buffer. The "-4" omits the FCS (CRC). */ 780 int pkt_len = (rx_head.rx_count & 0x7ff) - 4; 781 struct sk_buff *skb; 782 783 skb = netdev_alloc_skb(dev, pkt_len + 2); 784 if (skb == NULL) { 785 dev->stats.rx_dropped++; 786 goto done; 787 } 788 789 skb_reserve(skb, 2); /* Align IP on 16 byte boundaries */ 790 read_block(ioaddr, pkt_len, skb_put(skb,pkt_len), dev->if_port); 791 skb->protocol = eth_type_trans(skb, dev); 792 netif_rx(skb); 793 dev->last_rx = jiffies; 794 dev->stats.rx_packets++; 795 dev->stats.rx_bytes += pkt_len; 796 } 797 done: 798 write_reg(ioaddr, CMR1, CMR1_NextPkt); 799 lp->last_rx_time = jiffies; 800 } 801 802 static void read_block(long ioaddr, int length, unsigned char *p, int data_mode) 803 { 804 if (data_mode <= 3) { /* Mode 0 or 1 */ 805 outb(Ctrl_LNibRead, ioaddr + PAR_CONTROL); 806 outb(length == 8 ? RdAddr | HNib | MAR : RdAddr | MAR, 807 ioaddr + PAR_DATA); 808 if (data_mode <= 1) { /* Mode 0 or 1 */ 809 do { *p++ = read_byte_mode0(ioaddr); } while (--length > 0); 810 } else { /* Mode 2 or 3 */ 811 do { *p++ = read_byte_mode2(ioaddr); } while (--length > 0); 812 } 813 } else if (data_mode <= 5) { 814 do { *p++ = read_byte_mode4(ioaddr); } while (--length > 0); 815 } else { 816 do { *p++ = read_byte_mode6(ioaddr); } while (--length > 0); 817 } 818 819 outb(EOC+HNib+MAR, ioaddr + PAR_DATA); 820 outb(Ctrl_SelData, ioaddr + PAR_CONTROL); 821 } 822 823 /* The inverse routine to net_open(). */ 824 static int 825 net_close(struct net_device *dev) 826 { 827 struct net_local *lp = netdev_priv(dev); 828 long ioaddr = dev->base_addr; 829 830 netif_stop_queue(dev); 831 832 del_timer_sync(&lp->timer); 833 834 /* Flush the Tx and disable Rx here. */ 835 lp->addr_mode = CMR2h_OFF; 836 write_reg_high(ioaddr, CMR2, CMR2h_OFF); 837 838 /* Free the IRQ line. */ 839 outb(0x00, ioaddr + PAR_CONTROL); 840 free_irq(dev->irq, dev); 841 842 /* Reset the ethernet hardware and activate the printer pass-through. */ 843 write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX); 844 return 0; 845 } 846 847 /* 848 * Set or clear the multicast filter for this adapter. 849 */ 850 851 static void set_rx_mode(struct net_device *dev) 852 { 853 struct net_local *lp = netdev_priv(dev); 854 long ioaddr = dev->base_addr; 855 856 if (!netdev_mc_empty(dev) || (dev->flags & (IFF_ALLMULTI|IFF_PROMISC))) 857 lp->addr_mode = CMR2h_PROMISC; 858 else 859 lp->addr_mode = CMR2h_Normal; 860 write_reg_high(ioaddr, CMR2, lp->addr_mode); 861 } 862 863 static int __init atp_init_module(void) { 864 if (debug) /* Emit version even if no cards detected. */ 865 printk(KERN_INFO "%s", version); 866 return atp_init(); 867 } 868 869 static void __exit atp_cleanup_module(void) { 870 struct net_device *next_dev; 871 872 while (root_atp_dev) { 873 struct net_local *atp_local = netdev_priv(root_atp_dev); 874 next_dev = atp_local->next_module; 875 unregister_netdev(root_atp_dev); 876 /* No need to release_region(), since we never snarf it. */ 877 free_netdev(root_atp_dev); 878 root_atp_dev = next_dev; 879 } 880 } 881 882 module_init(atp_init_module); 883 module_exit(atp_cleanup_module); 884