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