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*/
1
2 /* eexpress.c: Intel EtherExpress device driver for Linux. */
3 /*
4 Written 1993 by Donald Becker.
5 Copyright 1993 United States Government as represented by the Director,
6 National Security Agency. This software may only be used and distributed
7 according to the terms of the GNU Public License as modified by SRC,
8 incorporated herein by reference.
9
10 The author may be reached as becker@super.org or
11 C/O Supercomputing Research Ctr., 17100 Science Dr., Bowie MD 20715
12
13 Things remaining to do:
14 Check that the 586 and ASIC are reset/unreset at the right times.
15 Check tx and rx buffer setup.
16 The current Tx is single-buffer-only.
17 Move the theory of operation and memory map documentation.
18 Rework the board error reset
19 The statistics need to be updated correctly.
20
21 Modularized by Pauline Middelink <middelin@polyware.iaf.nl>
22 Changed to support io= irq= by Alan Cox <Alan.Cox@linux.org>
23 */
24
25 static char *version =
26 "eexpress.c:v0.07 1/19/94 Donald Becker (becker@super.org)\n";
27
28 #include <linux/config.h>
29
30 /*
31 Sources:
32 This driver wouldn't have been written with the availability of the
33 Crynwr driver source code. It provided a known-working implementation
34 that filled in the gaping holes of the Intel documentation. Three cheers
35 for Russ Nelson.
36
37 Intel Microcommunications Databook, Vol. 1, 1990. It provides just enough
38 info that the casual reader might think that it documents the i82586.
39 */
40
41 #ifdef MODULE
42 #include <linux/module.h>
43 #include <linux/version.h>
44 #endif
45
46 #include <linux/kernel.h>
47 #include <linux/sched.h>
48 #include <linux/types.h>
49 #include <linux/fcntl.h>
50 #include <linux/interrupt.h>
51 #include <linux/ptrace.h>
52 #include <linux/ioport.h>
53 #include <linux/string.h>
54 #include <linux/in.h>
55 #include <asm/system.h>
56 #include <asm/bitops.h>
57 #include <asm/io.h>
58 #include <asm/dma.h>
59 #include <linux/errno.h>
60
61 #include <linux/netdevice.h>
62 #include <linux/etherdevice.h>
63 #include <linux/skbuff.h>
64 #include <linux/malloc.h>
65
66 /* use 0 for production, 1 for verification, 2..7 for debug */
67 #ifndef NET_DEBUG
68 #define NET_DEBUG 2
69 #endif
70 static unsigned int net_debug = NET_DEBUG;
71
72 /*
73 Details of the i82586.
74
75 You'll really need the databook to understand the details of this part,
76 but the outline is that the i82586 has two separate processing units.
77
78 The Rx unit uses a list of frame descriptors and a list of data buffer
79 descriptors. We use full-sized (1518 byte) data buffers, so there is
80 a one-to-one pairing of frame descriptors to buffer descriptors.
81
82 The Tx ("command") unit executes a list of commands that look like:
83 Status word Written by the 82586 when the command is done.
84 Command word Command in lower 3 bits, post-command action in upper 3
85 Link word The address of the next command.
86 Parameters (as needed).
87
88 Some definitions related to the Command Word are:
89 */
90 #define CMD_EOL 0x8000 /* The last command of the list, stop. */
91 #define CMD_SUSP 0x4000 /* Suspend after doing cmd. */
92 #define CMD_INTR 0x2000 /* Interrupt after doing cmd. */
93
94 enum commands {
95 CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
96 CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7};
97
98 /* Information that need to be kept for each board. */
99 struct net_local {
100 struct enet_statistics stats;
101 int last_restart;
102 short rx_head;
103 short rx_tail;
104 short tx_head;
105 short tx_cmd_link;
106 short tx_reap;
107 };
108
109 /*
110 Details of the EtherExpress Implementation
111 The EtherExpress takes an unusual approach to host access to packet buffer
112 memory. The host can use either the Dataport, with independent
113 autoincrementing read and write pointers, or it can I/O map 32 bytes of the
114 memory using the "Shadow Memory Pointer" (SMB) as follows:
115 ioaddr Normal EtherExpress registers
116 ioaddr+0x4000...0x400f Buffer Memory at SMB...SMB+15
117 ioaddr+0x8000...0x800f Buffer Memory at SMB+16...SMB+31
118 ioaddr+0xC000...0xC007 "" SMB+16...SMB+23 (hardware flaw?)
119 ioaddr+0xC008...0xC00f Buffer Memory at 0x0008...0x000f
120 The last I/O map set is useful if you put the i82586 System Command Block
121 (the command mailbox) exactly at 0x0008. (There seems to be some
122 undocumented init structure at 0x0000-7, so I had to use the Crywnr memory
123 setup verbatim for those four words anyway.)
124
125 A problem with using either one of these mechanisms is that you must run
126 single-threaded, or the interrupt handler must restore a changed value of
127 the read, write, or SMB pointers.
128
129 Unlike the Crynwr driver, my driver mostly ignores the I/O mapped "feature"
130 and relies heavily on the dataport for buffer memory access. To minimize
131 switching, the read_pointer is dedicated to the Rx interrupt handler, and
132 the write_pointer is used by the send_packet() routine (it's carefully saved
133 and restored when it's needed by the interrupt handler).
134 */
135
136 /* Offsets from the base I/O address. */
137 #define DATAPORT 0 /* Data Transfer Register. */
138 #define WRITE_PTR 2 /* Write Address Pointer. */
139 #define READ_PTR 4 /* Read Address Pointer. */
140 #define SIGNAL_CA 6 /* Frob the 82586 Channel Attention line. */
141 #define SET_IRQ 7 /* IRQ Select. */
142 #define SHADOW_PTR 8 /* Shadow Memory Bank Pointer. */
143 #define MEM_Ctrl 11
144 #define MEM_Page_Ctrl 12
145 #define Config 13
146 #define EEPROM_Ctrl 14
147 #define ID_PORT 15
148
149 /* EEPROM_Ctrl bits. */
150
151 #define EE_SHIFT_CLK 0x01 /* EEPROM shift clock. */
152 #define EE_CS 0x02 /* EEPROM chip select. */
153 #define EE_DATA_WRITE 0x04 /* EEPROM chip data in. */
154 #define EE_DATA_READ 0x08 /* EEPROM chip data out. */
155 #define EE_CTRL_BITS (EE_SHIFT_CLK | EE_CS | EE_DATA_WRITE | EE_DATA_READ)
156 #define ASIC_RESET 0x40
157 #define _586_RESET 0x80
158
159 /* Offsets to elements of the System Control Block structure. */
160 #define SCB_STATUS 0xc008
161 #define SCB_CMD 0xc00A
162 #define CUC_START 0x0100
163 #define CUC_RESUME 0x0200
164 #define CUC_SUSPEND 0x0300
165 #define RX_START 0x0010
166 #define RX_RESUME 0x0020
167 #define RX_SUSPEND 0x0030
168 #define SCB_CBL 0xc00C /* Command BLock offset. */
169 #define SCB_RFA 0xc00E /* Rx Frame Area offset. */
170
171 /*
172 What follows in 'init_words[]' is the "program" that is downloaded to the
173 82586 memory. It's mostly tables and command blocks, and starts at the
174 reset address 0xfffff6.
175
176 Even with the additional "don't care" values, doing it this way takes less
177 program space than initializing the individual tables, and I feel it's much
178 cleaner.
179
180 The databook is particularly useless for the first two structures; they are
181 completely undocumented. I had to use the Crynwr driver as an example.
182
183 The memory setup is as follows:
184 */
185
186 #define CONFIG_CMD 0x0018
187 #define SET_SA_CMD 0x0024
188 #define SA_OFFSET 0x002A
189 #define IDLELOOP 0x30
190 #define TDR_CMD 0x38
191 #define TDR_TIME 0x3C
192 #define DUMP_CMD 0x40
193 #define DIAG_CMD 0x48
194 #define SET_MC_CMD 0x4E
195 #define DUMP_DATA 0x56 /* A 170 byte buffer for dump and Set-MC into. */
196
197 #define TX_BUF_START 0x0100
198 #define NUM_TX_BUFS 4
199 #define TX_BUF_SIZE 0x0680 /* packet+header+TBD+extra (1518+14+20+16) */
200 #define TX_BUF_END 0x2000
201
202 #define RX_BUF_START 0x2000
203 #define RX_BUF_SIZE (0x640) /* packet+header+RBD+extra */
204 #define RX_BUF_END 0x4000
205
206 /*
207 That's it: only 86 bytes to set up the beast, including every extra
208 command available. The 170 byte buffer at DUMP_DATA is shared between the
209 Dump command (called only by the diagnostic program) and the SetMulticastList
210 command.
211
212 To complete the memory setup you only have to write the station address at
213 SA_OFFSET and create the Tx & Rx buffer lists.
214
215 The Tx command chain and buffer list is setup as follows:
216 A Tx command table, with the data buffer pointing to...
217 A Tx data buffer descriptor. The packet is in a single buffer, rather than
218 chaining together several smaller buffers.
219 A NoOp command, which initially points to itself,
220 And the packet data.
221
222 A transmit is done by filling in the Tx command table and data buffer,
223 re-writing the NoOp command, and finally changing the offset of the last
224 command to point to the current Tx command. When the Tx command is finished,
225 it jumps to the NoOp, when it loops until the next Tx command changes the
226 "link offset" in the NoOp. This way the 82586 never has to go through the
227 slow restart sequence.
228
229 The Rx buffer list is set up in the obvious ring structure. We have enough
230 memory (and low enough interrupt latency) that we can avoid the complicated
231 Rx buffer linked lists by alway associating a full-size Rx data buffer with
232 each Rx data frame.
233
234 I current use four transmit buffers starting at TX_BUF_START (0x0100), and
235 use the rest of memory, from RX_BUF_START to RX_BUF_END, for Rx buffers.
236
237 */
238
239 static short init_words[] = {
240 0x0000, /* Set bus size to 16 bits. */
241 0x0000,0x0000, /* Set control mailbox (SCB) addr. */
242 0,0, /* pad to 0x000000. */
243 0x0001, /* Status word that's cleared when init is done. */
244 0x0008,0,0, /* SCB offset, (skip, skip) */
245
246 0,0xf000|RX_START|CUC_START, /* SCB status and cmd. */
247 CONFIG_CMD, /* Command list pointer, points to Configure. */
248 RX_BUF_START, /* Rx block list. */
249 0,0,0,0, /* Error count: CRC, align, buffer, overrun. */
250
251 /* 0x0018: Configure command. Change to put MAC data with packet. */
252 0, CmdConfigure, /* Status, command. */
253 SET_SA_CMD, /* Next command is Set Station Addr. */
254 0x0804, /* "4" bytes of config data, 8 byte FIFO. */
255 0x2e40, /* Magic values, including MAC data location. */
256 0, /* Unused pad word. */
257
258 /* 0x0024: Setup station address command. */
259 0, CmdSASetup,
260 SET_MC_CMD, /* Next command. */
261 0xaa00,0xb000,0x0bad, /* Station address (to be filled in) */
262
263 /* 0x0030: NOP, looping back to itself. Point to first Tx buffer to Tx. */
264 0, CmdNOp, IDLELOOP, 0 /* pad */,
265
266 /* 0x0038: A unused Time-Domain Reflectometer command. */
267 0, CmdTDR, IDLELOOP, 0,
268
269 /* 0x0040: An unused Dump State command. */
270 0, CmdDump, IDLELOOP, DUMP_DATA,
271
272 /* 0x0048: An unused Diagnose command. */
273 0, CmdDiagnose, IDLELOOP,
274
275 /* 0x004E: An empty set-multicast-list command. */
276 #ifdef initial_text_tx
277 0, CmdMulticastList, DUMP_DATA, 0,
278 #else
279 0, CmdMulticastList, IDLELOOP, 0,
280 #endif
281
282 /* 0x0056: A continuous transmit command, only here for testing. */
283 0, CmdTx, DUMP_DATA, DUMP_DATA+8, 0x83ff, -1, DUMP_DATA, 0,
284 };
285
286 /* Index to functions, as function prototypes. */
287
288 extern int express_probe(struct device *dev); /* Called from Space.c */
289
290 static int eexp_probe1(struct device *dev, short ioaddr);
291 static int eexp_open(struct device *dev);
292 static int eexp_send_packet(struct sk_buff *skb, struct device *dev);
293 static void eexp_interrupt(int irq, struct pt_regs *regs);
294 static void eexp_rx(struct device *dev);
295 static int eexp_close(struct device *dev);
296 static struct enet_statistics *eexp_get_stats(struct device *dev);
297 static void set_multicast_list(struct device *dev, int num_addrs, void *addrs);
298
299 static int read_eeprom(int ioaddr, int location);
300 static void hardware_send_packet(struct device *dev, void *buf, short length);
301 static void init_82586_mem(struct device *dev);
302 static void init_rx_bufs(struct device *dev);
303
304
305 /* Check for a network adaptor of this type, and return '0' iff one exists.
306 If dev->base_addr == 0, probe all likely locations.
307 If dev->base_addr == 1, always return failure.
308 If dev->base_addr == 2, (detachable devices only) allocate space for the
309 device and return success.
310 */
311 int
312 express_probe(struct device *dev)
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*/
313 {
314 /* Don't probe all settable addresses, 0x[23][0-7]0, just common ones. */
315 int *port, ports[] = {0x300, 0x270, 0x320, 0x340, 0};
316 int base_addr = dev->base_addr;
317
318 if (base_addr > 0x1ff) /* Check a single specified location. */
319 return eexp_probe1(dev, base_addr);
320 else if (base_addr > 0)
321 return ENXIO; /* Don't probe at all. */
322
323 for (port = &ports[0]; *port; port++) {
324 short id_addr = *port + ID_PORT;
325 unsigned short sum = 0;
326 int i;
327 #ifdef notdef
328 for (i = 16; i > 0; i--)
329 sum += inb(id_addr);
330 printk("EtherExpress ID checksum is %04x.\n", sum);
331 #else
332 for (i = 4; i > 0; i--) {
333 short id_val = inb(id_addr);
334 sum |= (id_val >> 4) << ((id_val & 3) << 2);
335 }
336 #endif
337 if (sum == 0xbaba
338 && eexp_probe1(dev, *port) == 0)
339 return 0;
340 }
341
342 return ENODEV; /* ENODEV would be more accurate. */
343 }
344
345 int eexp_probe1(struct device *dev, short ioaddr)
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*/
346 {
347 unsigned short station_addr[3];
348 int i;
349
350 printk("%s: EtherExpress at %#x,", dev->name, ioaddr);
351
352 /* The station address is stored !backwards! in the EEPROM, reverse
353 after reading. (Hmmm, a little brain-damage there at Intel, eh?) */
354 station_addr[0] = read_eeprom(ioaddr, 2);
355 station_addr[1] = read_eeprom(ioaddr, 3);
356 station_addr[2] = read_eeprom(ioaddr, 4);
357
358 /* Check the first three octets of the S.A. for the manufacturer's code. */
359 if (station_addr[2] != 0x00aa || (station_addr[1] & 0xff00) != 0x0000) {
360 printk(" rejected (invalid address %04x%04x%04x).\n",
361 station_addr[2], station_addr[1], station_addr[0]);
362 return ENODEV;
363 }
364
365 /* We've committed to using the board, and can start filling in *dev. */
366 request_region(ioaddr, 16,"eexpress");
367 dev->base_addr = ioaddr;
368
369 for (i = 0; i < 6; i++) {
370 dev->dev_addr[i] = ((unsigned char*)station_addr)[5-i];
371 printk(" %02x", dev->dev_addr[i]);
372 }
373
374 /* There is no reason for the driver to care, but I print out the
375 interface to minimize bogus bug reports. */
376 {
377 char irqmap[] = {0, 9, 3, 4, 5, 10, 11, 0};
378 char *ifmap[] = {"AUI", "BNC", "10baseT"};
379 enum iftype {AUI=0, BNC=1, TP=2};
380 unsigned short setupval = read_eeprom(ioaddr, 0);
381
382 dev->irq = irqmap[setupval >> 13];
383 dev->if_port = (setupval & 0x1000) == 0 ? AUI :
384 read_eeprom(ioaddr, 5) & 0x1 ? TP : BNC;
385 printk(", IRQ %d, Interface %s.\n", dev->irq, ifmap[dev->if_port]);
386 /* Release the IRQ line so that it can be shared if we don't use the
387 ethercard. */
388 outb(0x00, ioaddr + SET_IRQ);
389 }
390
391 /* It's now OK to leave the board in reset, pending the open(). */
392 outb(ASIC_RESET, ioaddr + EEPROM_Ctrl);
393
394 if ((dev->mem_start & 0xf) > 0)
395 net_debug = dev->mem_start & 7;
396
397 if (net_debug)
398 printk(version);
399
400 /* Initialize the device structure. */
401 dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);
402 memset(dev->priv, 0, sizeof(struct net_local));
403
404 dev->open = eexp_open;
405 dev->stop = eexp_close;
406 dev->hard_start_xmit = eexp_send_packet;
407 dev->get_stats = eexp_get_stats;
408 dev->set_multicast_list = &set_multicast_list;
409
410 /* Fill in the fields of the device structure with ethernet-generic values. */
411
412 ether_setup(dev);
413
414 return 0;
415 }
416
417
418 /* Reverse IRQ map: the value to put in the SET_IRQ reg. for IRQ<index>. */
419 static char irqrmap[]={0,0,1,2,3,4,0,0,0,1,5,6,0,0,0,0};
420
421 static int
422 eexp_open(struct device *dev)
/* */
423 {
424 int ioaddr = dev->base_addr;
425
426 if (dev->irq == 0 || irqrmap[dev->irq] == 0)
427 return -ENXIO;
428
429 if (irq2dev_map[dev->irq] != 0
430 /* This is always true, but avoid the false IRQ. */
431 || (irq2dev_map[dev->irq] = dev) == 0
432 || request_irq(dev->irq, &eexp_interrupt, 0, "EExpress")) {
433 return -EAGAIN;
434 }
435
436 /* Initialize the 82586 memory and start it. */
437 init_82586_mem(dev);
438
439 /* Enable the interrupt line. */
440 outb(irqrmap[dev->irq] | 0x08, ioaddr + SET_IRQ);
441
442 dev->tbusy = 0;
443 dev->interrupt = 0;
444 dev->start = 1;
445 #ifdef MODULE
446 MOD_INC_USE_COUNT;
447 #endif
448 return 0;
449 }
450
451 static int
452 eexp_send_packet(struct sk_buff *skb, struct device *dev)
/* */
453 {
454 struct net_local *lp = (struct net_local *)dev->priv;
455 int ioaddr = dev->base_addr;
456
457 if (dev->tbusy) {
458 /* If we get here, some higher level has decided we are broken.
459 There should really be a "kick me" function call instead. */
460 int tickssofar = jiffies - dev->trans_start;
461 if (tickssofar < 5)
462 return 1;
463 if (net_debug > 1)
464 printk("%s: transmit timed out, %s? ", dev->name,
465 inw(ioaddr+SCB_STATUS) & 0x8000 ? "IRQ conflict" :
466 "network cable problem");
467 lp->stats.tx_errors++;
468 /* Try to restart the adaptor. */
469 if (lp->last_restart == lp->stats.tx_packets) {
470 if (net_debug > 1) printk("Resetting board.\n");
471 /* Completely reset the adaptor. */
472 init_82586_mem(dev);
473 } else {
474 /* Issue the channel attention signal and hope it "gets better". */
475 if (net_debug > 1) printk("Kicking board.\n");
476 outw(0xf000|CUC_START|RX_START, ioaddr + SCB_CMD);
477 outb(0, ioaddr + SIGNAL_CA);
478 lp->last_restart = lp->stats.tx_packets;
479 }
480 dev->tbusy=0;
481 dev->trans_start = jiffies;
482 }
483
484 /* If some higher layer thinks we've missed an tx-done interrupt
485 we are passed NULL. Caution: dev_tint() handles the cli()/sti()
486 itself. */
487 if (skb == NULL) {
488 dev_tint(dev);
489 return 0;
490 }
491
492 /* Block a timer-based transmit from overlapping. */
493 if (set_bit(0, (void*)&dev->tbusy) != 0)
494 printk("%s: Transmitter access conflict.\n", dev->name);
495 else {
496 short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
497 unsigned char *buf = skb->data;
498
499 /* Disable the 82586's input to the interrupt line. */
500 outb(irqrmap[dev->irq], ioaddr + SET_IRQ);
501 hardware_send_packet(dev, buf, length);
502 dev->trans_start = jiffies;
503 /* Enable the 82586 interrupt input. */
504 outb(0x08 | irqrmap[dev->irq], ioaddr + SET_IRQ);
505 }
506
507 dev_kfree_skb (skb, FREE_WRITE);
508
509 /* You might need to clean up and record Tx statistics here. */
510 lp->stats.tx_aborted_errors++;
511
512 return 0;
513 }
514
515 /* The typical workload of the driver:
516 Handle the network interface interrupts. */
517 static void
518 eexp_interrupt(int irq, struct pt_regs *regs)
/* */
519 {
520 struct device *dev = (struct device *)(irq2dev_map[irq]);
521 struct net_local *lp;
522 int ioaddr, status, boguscount = 0;
523 short ack_cmd;
524
525 if (dev == NULL) {
526 printk ("net_interrupt(): irq %d for unknown device.\n", irq);
527 return;
528 }
529 dev->interrupt = 1;
530
531 ioaddr = dev->base_addr;
532 lp = (struct net_local *)dev->priv;
533
534 status = inw(ioaddr + SCB_STATUS);
535
536 if (net_debug > 4) {
537 printk("%s: EExp interrupt, status %4.4x.\n", dev->name, status);
538 }
539
540 /* Disable the 82586's input to the interrupt line. */
541 outb(irqrmap[dev->irq], ioaddr + SET_IRQ);
542
543 /* Reap the Tx packet buffers. */
544 while (lp->tx_reap != lp->tx_head) { /* if (status & 0x8000) */
545 unsigned short tx_status;
546 outw(lp->tx_reap, ioaddr + READ_PTR);
547 tx_status = inw(ioaddr);
548 if (tx_status == 0) {
549 if (net_debug > 5) printk("Couldn't reap %#x.\n", lp->tx_reap);
550 break;
551 }
552 if (tx_status & 0x2000) {
553 lp->stats.tx_packets++;
554 lp->stats.collisions += tx_status & 0xf;
555 dev->tbusy = 0;
556 mark_bh(NET_BH); /* Inform upper layers. */
557 } else {
558 lp->stats.tx_errors++;
559 if (tx_status & 0x0600) lp->stats.tx_carrier_errors++;
560 if (tx_status & 0x0100) lp->stats.tx_fifo_errors++;
561 if (!(tx_status & 0x0040)) lp->stats.tx_heartbeat_errors++;
562 if (tx_status & 0x0020) lp->stats.tx_aborted_errors++;
563 }
564 if (net_debug > 5)
565 printk("Reaped %x, Tx status %04x.\n" , lp->tx_reap, tx_status);
566 lp->tx_reap += TX_BUF_SIZE;
567 if (lp->tx_reap > TX_BUF_END - TX_BUF_SIZE)
568 lp->tx_reap = TX_BUF_START;
569 if (++boguscount > 4)
570 break;
571 }
572
573 if (status & 0x4000) { /* Packet received. */
574 if (net_debug > 5)
575 printk("Received packet, rx_head %04x.\n", lp->rx_head);
576 eexp_rx(dev);
577 }
578
579 /* Acknowledge the interrupt sources. */
580 ack_cmd = status & 0xf000;
581
582 if ((status & 0x0700) != 0x0200 && dev->start) {
583 short saved_write_ptr = inw(ioaddr + WRITE_PTR);
584 if (net_debug > 1)
585 printk("%s: Command unit stopped, status %04x, restarting.\n",
586 dev->name, status);
587 /* If this ever occurs we must re-write the idle loop, reset
588 the Tx list, and do a complete restart of the command unit. */
589 outw(IDLELOOP, ioaddr + WRITE_PTR);
590 outw(0, ioaddr);
591 outw(CmdNOp, ioaddr);
592 outw(IDLELOOP, ioaddr);
593 outw(IDLELOOP, SCB_CBL);
594 lp->tx_cmd_link = IDLELOOP + 4;
595 lp->tx_head = lp->tx_reap = TX_BUF_START;
596 /* Restore the saved write pointer. */
597 outw(saved_write_ptr, ioaddr + WRITE_PTR);
598 ack_cmd |= CUC_START;
599 }
600
601 if ((status & 0x0070) != 0x0040 && dev->start) {
602 short saved_write_ptr = inw(ioaddr + WRITE_PTR);
603 /* The Rx unit is not ready, it must be hung. Restart the receiver by
604 initializing the rx buffers, and issuing an Rx start command. */
605 lp->stats.rx_errors++;
606 if (net_debug > 1) {
607 int cur_rxbuf = RX_BUF_START;
608 printk("%s: Rx unit stopped status %04x rx head %04x tail %04x.\n",
609 dev->name, status, lp->rx_head, lp->rx_tail);
610 while (cur_rxbuf <= RX_BUF_END - RX_BUF_SIZE) {
611 int i;
612 printk(" Rx buf at %04x:", cur_rxbuf);
613 outw(cur_rxbuf, ioaddr + READ_PTR);
614 for (i = 0; i < 0x20; i += 2)
615 printk(" %04x", inw(ioaddr));
616 printk(".\n");
617 cur_rxbuf += RX_BUF_SIZE;
618 }
619 }
620 init_rx_bufs(dev);
621 outw(RX_BUF_START, SCB_RFA);
622 outw(saved_write_ptr, ioaddr + WRITE_PTR);
623 ack_cmd |= RX_START;
624 }
625
626 outw(ack_cmd, ioaddr + SCB_CMD);
627 outb(0, ioaddr + SIGNAL_CA);
628
629 if (net_debug > 5) {
630 printk("%s: EExp exiting interrupt, status %4.4x.\n", dev->name,
631 inw(ioaddr + SCB_CMD));
632 }
633 /* Enable the 82586's input to the interrupt line. */
634 outb(irqrmap[dev->irq] | 0x08, ioaddr + SET_IRQ);
635 return;
636 }
637
638 static int
639 eexp_close(struct device *dev)
/* */
640 {
641 int ioaddr = dev->base_addr;
642
643 dev->tbusy = 1;
644 dev->start = 0;
645
646 /* Flush the Tx and disable Rx. */
647 outw(RX_SUSPEND | CUC_SUSPEND, ioaddr + SCB_CMD);
648 outb(0, ioaddr + SIGNAL_CA);
649
650 /* Disable the physical interrupt line. */
651 outb(0, ioaddr + SET_IRQ);
652
653 free_irq(dev->irq);
654
655 irq2dev_map[dev->irq] = 0;
656
657 /* release the ioport-region */
658 release_region(ioaddr, 16);
659
660 /* Update the statistics here. */
661
662 #ifdef MODULE
663 MOD_DEC_USE_COUNT;
664 #endif
665 return 0;
666 }
667
668 /* Get the current statistics. This may be called with the card open or
669 closed. */
670 static struct enet_statistics *
671 eexp_get_stats(struct device *dev)
/* */
672 {
673 struct net_local *lp = (struct net_local *)dev->priv;
674
675 /* ToDo: decide if there are any useful statistics from the SCB. */
676
677 return &lp->stats;
678 }
679
680 /* Set or clear the multicast filter for this adaptor.
681 num_addrs == -1 Promiscuous mode, receive all packets
682 num_addrs == 0 Normal mode, clear multicast list
683 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
684 best-effort filtering.
685 */
686 static void
687 set_multicast_list(struct device *dev, int num_addrs, void *addrs)
/* */
688 {
689 /* This doesn't work yet */
690 #if 0
691 short ioaddr = dev->base_addr;
692 if (num_addrs < 0) {
693 /* Not written yet, this requires expanding the init_words config
694 cmd. */
695 } else if (num_addrs > 0) {
696 /* Fill in the SET_MC_CMD with the number of address bytes, followed
697 by the list of multicast addresses to be accepted. */
698 outw(SET_MC_CMD + 6, ioaddr + WRITE_PTR);
699 outw(num_addrs * 6, ioaddr);
700 outsw(ioaddr, addrs, num_addrs*3); /* 3 = addr len in words */
701 /* We must trigger a whole 586 reset due to a bug. */
702 } else {
703 /* Not written yet, this requires expanding the init_words config
704 cmd. */
705 outw(99, ioaddr); /* Disable promiscuous mode, use normal mode */
706 }
707 #endif
708 }
709
710 /* The horrible routine to read a word from the serial EEPROM. */
711
712 /* The delay between EEPROM clock transitions. */
713 #define eeprom_delay() { int _i = 40; while (--_i > 0) { __SLOW_DOWN_IO; }}
714 #define EE_READ_CMD (6 << 6)
715
716 int
717 read_eeprom(int ioaddr, int location)
/* */
718 {
719 int i;
720 unsigned short retval = 0;
721 short ee_addr = ioaddr + EEPROM_Ctrl;
722 int read_cmd = location | EE_READ_CMD;
723 short ctrl_val = EE_CS | _586_RESET;
724
725 outb(ctrl_val, ee_addr);
726
727 /* Shift the read command bits out. */
728 for (i = 8; i >= 0; i--) {
729 short outval = (read_cmd & (1 << i)) ? ctrl_val | EE_DATA_WRITE
730 : ctrl_val;
731 outb(outval, ee_addr);
732 outb(outval | EE_SHIFT_CLK, ee_addr); /* EEPROM clock tick. */
733 eeprom_delay();
734 outb(outval, ee_addr); /* Finish EEPROM a clock tick. */
735 eeprom_delay();
736 }
737 outb(ctrl_val, ee_addr);
738
739 for (i = 16; i > 0; i--) {
740 outb(ctrl_val | EE_SHIFT_CLK, ee_addr); eeprom_delay();
741 retval = (retval << 1) | ((inb(ee_addr) & EE_DATA_READ) ? 1 : 0);
742 outb(ctrl_val, ee_addr); eeprom_delay();
743 }
744
745 /* Terminate the EEPROM access. */
746 ctrl_val &= ~EE_CS;
747 outb(ctrl_val | EE_SHIFT_CLK, ee_addr);
748 eeprom_delay();
749 outb(ctrl_val, ee_addr);
750 eeprom_delay();
751 return retval;
752 }
753
754 static void
755 init_82586_mem(struct device *dev)
/* */
756 {
757 struct net_local *lp = (struct net_local *)dev->priv;
758 short ioaddr = dev->base_addr;
759
760 /* Enable loopback to protect the wire while starting up.
761 This is Superstition From Crynwr. */
762 outb(inb(ioaddr + Config) | 0x02, ioaddr + Config);
763
764 /* Hold the 586 in reset during the memory initialization. */
765 outb(_586_RESET, ioaddr + EEPROM_Ctrl);
766
767 /* Place the write pointer at 0xfff6 (address-aliased to 0xfffff6). */
768 outw(0xfff6, ioaddr + WRITE_PTR);
769 outsw(ioaddr, init_words, sizeof(init_words)>>1);
770
771 /* Fill in the station address. */
772 outw(SA_OFFSET, ioaddr + WRITE_PTR);
773 outsw(ioaddr, dev->dev_addr, 3);
774
775 /* The Tx-block list is written as needed. We just set up the values. */
776 #ifdef initial_text_tx
777 lp->tx_cmd_link = DUMP_DATA + 4;
778 #else
779 lp->tx_cmd_link = IDLELOOP + 4;
780 #endif
781 lp->tx_head = lp->tx_reap = TX_BUF_START;
782
783 init_rx_bufs(dev);
784
785 /* Start the 586 by releasing the reset line. */
786 outb(0x00, ioaddr + EEPROM_Ctrl);
787
788 /* This was time consuming to track down: you need to give two channel
789 attention signals to reliably start up the i82586. */
790 outb(0, ioaddr + SIGNAL_CA);
791
792 {
793 int boguscnt = 50;
794 while (inw(ioaddr + SCB_STATUS) == 0)
795 if (--boguscnt == 0) {
796 printk("%s: i82586 initialization timed out with status %04x, cmd %04x.\n",
797 dev->name, inw(ioaddr + SCB_STATUS), inw(ioaddr + SCB_CMD));
798 break;
799 }
800 /* Issue channel-attn -- the 82586 won't start without it. */
801 outb(0, ioaddr + SIGNAL_CA);
802 }
803
804 /* Disable loopback. */
805 outb(inb(ioaddr + Config) & ~0x02, ioaddr + Config);
806 if (net_debug > 4)
807 printk("%s: Initialized 82586, status %04x.\n", dev->name,
808 inw(ioaddr + SCB_STATUS));
809 return;
810 }
811
812 /* Initialize the Rx-block list. */
813 static void init_rx_bufs(struct device *dev)
/* */
814 {
815 struct net_local *lp = (struct net_local *)dev->priv;
816 short ioaddr = dev->base_addr;
817
818 int cur_rxbuf = lp->rx_head = RX_BUF_START;
819
820 /* Initialize each Rx frame + data buffer. */
821 do { /* While there is room for one more. */
822 outw(cur_rxbuf, ioaddr + WRITE_PTR);
823 outw(0x0000, ioaddr); /* Status */
824 outw(0x0000, ioaddr); /* Command */
825 outw(cur_rxbuf + RX_BUF_SIZE, ioaddr); /* Link */
826 outw(cur_rxbuf + 22, ioaddr); /* Buffer offset */
827 outw(0xFeed, ioaddr); /* Pad for dest addr. */
828 outw(0xF00d, ioaddr);
829 outw(0xF001, ioaddr);
830 outw(0x0505, ioaddr); /* Pad for source addr. */
831 outw(0x2424, ioaddr);
832 outw(0x6565, ioaddr);
833 outw(0xdeaf, ioaddr); /* Pad for protocol. */
834
835 outw(0x0000, ioaddr); /* Buffer: Actual count */
836 outw(-1, ioaddr); /* Buffer: Next (none). */
837 outw(cur_rxbuf + 0x20, ioaddr); /* Buffer: Address low */
838 outw(0x0000, ioaddr);
839 /* Finally, the number of bytes in the buffer. */
840 outw(0x8000 + RX_BUF_SIZE-0x20, ioaddr);
841
842 lp->rx_tail = cur_rxbuf;
843 cur_rxbuf += RX_BUF_SIZE;
844 } while (cur_rxbuf <= RX_BUF_END - RX_BUF_SIZE);
845
846 /* Terminate the list by setting the EOL bit, and wrap the pointer to make
847 the list a ring. */
848 outw(lp->rx_tail + 2, ioaddr + WRITE_PTR);
849 outw(0xC000, ioaddr); /* Command, mark as last. */
850 outw(lp->rx_head, ioaddr); /* Link */
851 }
852
853 static void
854 hardware_send_packet(struct device *dev, void *buf, short length)
/* */
855 {
856 struct net_local *lp = (struct net_local *)dev->priv;
857 short ioaddr = dev->base_addr;
858 short tx_block = lp->tx_head;
859
860 /* Set the write pointer to the Tx block, and put out the header. */
861 outw(tx_block, ioaddr + WRITE_PTR);
862 outw(0x0000, ioaddr); /* Tx status */
863 outw(CMD_INTR|CmdTx, ioaddr); /* Tx command */
864 outw(tx_block+16, ioaddr); /* Next command is a NoOp. */
865 outw(tx_block+8, ioaddr); /* Data Buffer offset. */
866
867 /* Output the data buffer descriptor. */
868 outw(length | 0x8000, ioaddr); /* Byte count parameter. */
869 outw(-1, ioaddr); /* No next data buffer. */
870 outw(tx_block+22, ioaddr); /* Buffer follows the NoOp command. */
871 outw(0x0000, ioaddr); /* Buffer address high bits (always zero). */
872
873 /* Output the Loop-back NoOp command. */
874 outw(0x0000, ioaddr); /* Tx status */
875 outw(CmdNOp, ioaddr); /* Tx command */
876 outw(tx_block+16, ioaddr); /* Next is myself. */
877
878 /* Output the packet using the write pointer.
879 Hmmm, it feels a little like a 3c501! */
880 outsw(ioaddr + DATAPORT, buf, (length + 1) >> 1);
881
882 /* Set the old command link pointing to this send packet. */
883 outw(lp->tx_cmd_link, ioaddr + WRITE_PTR);
884 outw(tx_block, ioaddr);
885 lp->tx_cmd_link = tx_block + 20;
886
887 /* Set the next free tx region. */
888 lp->tx_head = tx_block + TX_BUF_SIZE;
889 if (lp->tx_head > TX_BUF_END - TX_BUF_SIZE)
890 lp->tx_head = TX_BUF_START;
891
892 if (net_debug > 4) {
893 printk("%s: EExp @%x send length = %d, tx_block %3x, next %3x, "
894 "reap %4x status %4.4x.\n", dev->name, ioaddr, length,
895 tx_block, lp->tx_head, lp->tx_reap, inw(ioaddr + SCB_STATUS));
896 }
897
898 if (lp->tx_head != lp->tx_reap)
899 dev->tbusy = 0;
900 }
901
902 static void
903 eexp_rx(struct device *dev)
/* */
904 {
905 struct net_local *lp = (struct net_local *)dev->priv;
906 short ioaddr = dev->base_addr;
907 short saved_write_ptr = inw(ioaddr + WRITE_PTR);
908 short rx_head = lp->rx_head;
909 short rx_tail = lp->rx_tail;
910 short boguscount = 10;
911 short frame_status;
912
913 /* Set the read pointer to the Rx frame. */
914 outw(rx_head, ioaddr + READ_PTR);
915 while ((frame_status = inw(ioaddr)) < 0) { /* Command complete */
916 short rfd_cmd = inw(ioaddr);
917 short next_rx_frame = inw(ioaddr);
918 short data_buffer_addr = inw(ioaddr);
919 short pkt_len;
920
921 /* Set the read pointer the data buffer. */
922 outw(data_buffer_addr, ioaddr + READ_PTR);
923 pkt_len = inw(ioaddr);
924
925 if (rfd_cmd != 0 || data_buffer_addr != rx_head + 22
926 || pkt_len & 0xC000 != 0xC000) {
927 printk("%s: Rx frame at %#x corrupted, status %04x cmd %04x"
928 "next %04x data-buf @%04x %04x.\n", dev->name, rx_head,
929 frame_status, rfd_cmd, next_rx_frame, data_buffer_addr,
930 pkt_len);
931 } else if ((frame_status & 0x2000) == 0) {
932 /* Frame Rxed, but with error. */
933 lp->stats.rx_errors++;
934 if (frame_status & 0x0800) lp->stats.rx_crc_errors++;
935 if (frame_status & 0x0400) lp->stats.rx_frame_errors++;
936 if (frame_status & 0x0200) lp->stats.rx_fifo_errors++;
937 if (frame_status & 0x0100) lp->stats.rx_over_errors++;
938 if (frame_status & 0x0080) lp->stats.rx_length_errors++;
939 } else {
940 /* Malloc up new buffer. */
941 struct sk_buff *skb;
942
943 pkt_len &= 0x3fff;
944 skb = dev_alloc_skb(pkt_len+2);
945 if (skb == NULL) {
946 printk("%s: Memory squeeze, dropping packet.\n", dev->name);
947 lp->stats.rx_dropped++;
948 break;
949 }
950 skb->dev = dev;
951 skb_reserve(skb,2);
952
953 outw(data_buffer_addr + 10, ioaddr + READ_PTR);
954
955 insw(ioaddr, skb_put(skb,pkt_len), (pkt_len + 1) >> 1);
956
957 skb->protocol=eth_type_trans(skb,dev);
958 netif_rx(skb);
959 lp->stats.rx_packets++;
960 }
961
962 /* Clear the status word and set End-of-List on the rx frame. */
963 outw(rx_head, ioaddr + WRITE_PTR);
964 outw(0x0000, ioaddr);
965 outw(0xC000, ioaddr);
966 #ifndef final_version
967 if (next_rx_frame != rx_head + RX_BUF_SIZE
968 && next_rx_frame != RX_BUF_START) {
969 printk("%s: Rx next frame at %#x is %#x instead of %#x.\n", dev->name,
970 rx_head, next_rx_frame, rx_head + RX_BUF_SIZE);
971 next_rx_frame = rx_head + RX_BUF_SIZE;
972 if (next_rx_frame >= RX_BUF_END - RX_BUF_SIZE)
973 next_rx_frame = RX_BUF_START;
974 }
975 #endif
976 outw(rx_tail+2, ioaddr + WRITE_PTR);
977 outw(0x0000, ioaddr); /* Clear the end-of-list on the prev. RFD. */
978
979 #ifndef final_version
980 outw(rx_tail+4, ioaddr + READ_PTR);
981 if (inw(ioaddr) != rx_head) {
982 printk("%s: Rx buf link mismatch, at %04x link %04x instead of %04x.\n",
983 dev->name, rx_tail, (outw(rx_tail+4, ioaddr + READ_PTR),inw(ioaddr)),
984 rx_head);
985 outw(rx_head, ioaddr);
986 }
987 #endif
988
989 rx_tail = rx_head;
990 rx_head = next_rx_frame;
991 if (--boguscount == 0)
992 break;
993 outw(rx_head, ioaddr + READ_PTR);
994 }
995
996 lp->rx_head = rx_head;
997 lp->rx_tail = rx_tail;
998
999 /* Restore the original write pointer. */
1000 outw(saved_write_ptr, ioaddr + WRITE_PTR);
1001 }
1002
1003 #ifdef MODULE
1004 char kernel_version[] = UTS_RELEASE;
1005 static struct device dev_eexpress = {
1006 " " /*"eexpress"*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, express_probe };
1007
1008
1009 int irq=0;
1010 int io=0;
1011
1012 int
1013 init_module(void)
/* */
1014 {
1015 dev_eexpress.base_addr=io;
1016 dev_eexpress.irq=irq;
1017 if (register_netdev(&dev_eexpress) != 0)
1018 return -EIO;
1019 return 0;
1020 }
1021
1022 void
1023 cleanup_module(void)
/* ![[last]](../icons/n_last.png)
*/
1024 {
1025 if (MOD_IN_USE)
1026 printk("express: device busy, remove delayed\n");
1027 else
1028 {
1029 unregister_netdev(&dev_eexpress);
1030 kfree_s(dev_eexpress.priv,sizeof(struct net_local));
1031 dev_eexpress.priv=NULL;
1032 }
1033 }
1034 #endif /* MODULE */
1035 /*
1036 * Local variables:
1037 * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -I/usr/src/linux/drivers/net -Wall -Wstrict-prototypes -O6 -m486 -c eexpress.c"
1038 * version-control: t
1039 * kept-new-versions: 5
1040 * tab-width: 4
1041 * End:
1042 */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/