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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 */
23
24 static char *version =
25 "eexpress.c:v0.07 1/19/94 Donald Becker (becker@super.org)\n";
26
27 #include <linux/config.h>
28
29 /*
30 Sources:
31 This driver wouldn't have been written with the availability of the
32 Crynwr driver source code. It provided a known-working implementation
33 that filled in the gaping holes of the Intel documentation. Three cheers
34 for Russ Nelson.
35
36 Intel Microcommunications Databook, Vol. 1, 1990. It provides just enough
37 info that the casual reader might think that it documents the i82586.
38 */
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 #ifdef MODULE
59 #include <linux/module.h>
60 #include <linux/version.h>
61 #endif
62
63 #include <linux/malloc.h>
64
65 /* use 0 for production, 1 for verification, 2..7 for debug */
66 #ifndef NET_DEBUG
67 #define NET_DEBUG 2
68 #endif
69 static unsigned int net_debug = NET_DEBUG;
70
71 /*
72 Details of the i82586.
73
74 You'll really need the databook to understand the details of this part,
75 but the outline is that the i82586 has two separate processing units.
76
77 The Rx unit uses a list of frame descriptors and a list of data buffer
78 descriptors. We use full-sized (1518 byte) data buffers, so there is
79 a one-to-one pairing of frame descriptors to buffer descriptors.
80
81 The Tx ("command") unit executes a list of commands that look like:
82 Status word Written by the 82586 when the command is done.
83 Command word Command in lower 3 bits, post-command action in upper 3
84 Link word The address of the next command.
85 Parameters (as needed).
86
87 Some definitions related to the Command Word are:
88 */
89 #define CMD_EOL 0x8000 /* The last command of the list, stop. */
90 #define CMD_SUSP 0x4000 /* Suspend after doing cmd. */
91 #define CMD_INTR 0x2000 /* Interrupt after doing cmd. */
92
93 enum commands {
94 CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
95 CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7};
96
97 /* Information that need to be kept for each board. */
98 struct net_local {
99 struct enet_statistics stats;
100 int last_restart;
101 short rx_head;
102 short rx_tail;
103 short tx_head;
104 short tx_cmd_link;
105 short tx_reap;
106 };
107
108 /*
109 Details of the EtherExpress Implementation
110 The EtherExpress takes an unusual approach to host access to packet buffer
111 memory. The host can use either the Dataport, with independent
112 autoincrementing read and write pointers, or it can I/O map 32 bytes of the
113 memory using the "Shadow Memory Pointer" (SMB) as follows:
114 ioaddr Normal EtherExpress registers
115 ioaddr+0x4000...0x400f Buffer Memory at SMB...SMB+15
116 ioaddr+0x8000...0x800f Buffer Memory at SMB+16...SMB+31
117 ioaddr+0xC000...0xC007 "" SMB+16...SMB+23 (hardware flaw?)
118 ioaddr+0xC008...0xC00f Buffer Memory at 0x0008...0x000f
119 The last I/O map set is useful if you put the i82586 System Command Block
120 (the command mailbox) exactly at 0x0008. (There seems to be some
121 undocumented init structure at 0x0000-7, so I had to use the Crywnr memory
122 setup verbatim for those four words anyway.)
123
124 A problem with using either one of these mechanisms is that you must run
125 single-threaded, or the interrupt handler must restore a changed value of
126 the read, write, or SMB pointers.
127
128 Unlike the Crynwr driver, my driver mostly ignores the I/O mapped "feature"
129 and relies heavily on the dataport for buffer memory access. To minimize
130 switching, the read_pointer is dedicated to the Rx interrupt handler, and
131 the write_pointer is used by the send_packet() routine (it's carefully saved
132 and restored when it's needed by the interrupt handler).
133 */
134
135 /* Offsets from the base I/O address. */
136 #define DATAPORT 0 /* Data Transfer Register. */
137 #define WRITE_PTR 2 /* Write Address Pointer. */
138 #define READ_PTR 4 /* Read Address Pointer. */
139 #define SIGNAL_CA 6 /* Frob the 82586 Channel Attention line. */
140 #define SET_IRQ 7 /* IRQ Select. */
141 #define SHADOW_PTR 8 /* Shadow Memory Bank Pointer. */
142 #define MEM_Ctrl 11
143 #define MEM_Page_Ctrl 12
144 #define Config 13
145 #define EEPROM_Ctrl 14
146 #define ID_PORT 15
147
148 /* EEPROM_Ctrl bits. */
149
150 #define EE_SHIFT_CLK 0x01 /* EEPROM shift clock. */
151 #define EE_CS 0x02 /* EEPROM chip select. */
152 #define EE_DATA_WRITE 0x04 /* EEPROM chip data in. */
153 #define EE_DATA_READ 0x08 /* EEPROM chip data out. */
154 #define EE_CTRL_BITS (EE_SHIFT_CLK | EE_CS | EE_DATA_WRITE | EE_DATA_READ)
155 #define ASIC_RESET 0x40
156 #define _586_RESET 0x80
157
158 /* Offsets to elements of the System Control Block structure. */
159 #define SCB_STATUS 0xc008
160 #define SCB_CMD 0xc00A
161 #define CUC_START 0x0100
162 #define CUC_RESUME 0x0200
163 #define CUC_SUSPEND 0x0300
164 #define RX_START 0x0010
165 #define RX_RESUME 0x0020
166 #define RX_SUSPEND 0x0030
167 #define SCB_CBL 0xc00C /* Command BLock offset. */
168 #define SCB_RFA 0xc00E /* Rx Frame Area offset. */
169
170 /*
171 What follows in 'init_words[]' is the "program" that is downloaded to the
172 82586 memory. It's mostly tables and command blocks, and starts at the
173 reset address 0xfffff6.
174
175 Even with the additional "don't care" values, doing it this way takes less
176 program space than initializing the individual tables, and I feel it's much
177 cleaner.
178
179 The databook is particularly useless for the first two structures; they are
180 completely undocumented. I had to use the Crynwr driver as an example.
181
182 The memory setup is as follows:
183 */
184
185 #define CONFIG_CMD 0x0018
186 #define SET_SA_CMD 0x0024
187 #define SA_OFFSET 0x002A
188 #define IDLELOOP 0x30
189 #define TDR_CMD 0x38
190 #define TDR_TIME 0x3C
191 #define DUMP_CMD 0x40
192 #define DIAG_CMD 0x48
193 #define SET_MC_CMD 0x4E
194 #define DUMP_DATA 0x56 /* A 170 byte buffer for dump and Set-MC into. */
195
196 #define TX_BUF_START 0x0100
197 #define NUM_TX_BUFS 4
198 #define TX_BUF_SIZE 0x0680 /* packet+header+TBD+extra (1518+14+20+16) */
199 #define TX_BUF_END 0x2000
200
201 #define RX_BUF_START 0x2000
202 #define RX_BUF_SIZE (0x640) /* packet+header+RBD+extra */
203 #define RX_BUF_END 0x4000
204
205 /*
206 That's it: only 86 bytes to set up the beast, including every extra
207 command available. The 170 byte buffer at DUMP_DATA is shared between the
208 Dump command (called only by the diagnostic program) and the SetMulticastList
209 command.
210
211 To complete the memory setup you only have to write the station address at
212 SA_OFFSET and create the Tx & Rx buffer lists.
213
214 The Tx command chain and buffer list is setup as follows:
215 A Tx command table, with the data buffer pointing to...
216 A Tx data buffer descriptor. The packet is in a single buffer, rather than
217 chaining together several smaller buffers.
218 A NoOp command, which initially points to itself,
219 And the packet data.
220
221 A transmit is done by filling in the Tx command table and data buffer,
222 re-writing the NoOp command, and finally changing the offset of the last
223 command to point to the current Tx command. When the Tx command is finished,
224 it jumps to the NoOp, when it loops until the next Tx command changes the
225 "link offset" in the NoOp. This way the 82586 never has to go through the
226 slow restart sequence.
227
228 The Rx buffer list is set up in the obvious ring structure. We have enough
229 memory (and low enough interrupt latency) that we can avoid the complicated
230 Rx buffer linked lists by alway associating a full-size Rx data buffer with
231 each Rx data frame.
232
233 I current use four transmit buffers starting at TX_BUF_START (0x0100), and
234 use the rest of memory, from RX_BUF_START to RX_BUF_END, for Rx buffers.
235
236 */
237
238 static short init_words[] = {
239 0x0000, /* Set bus size to 16 bits. */
240 0x0000,0x0000, /* Set control mailbox (SCB) addr. */
241 0,0, /* pad to 0x000000. */
242 0x0001, /* Status word that's cleared when init is done. */
243 0x0008,0,0, /* SCB offset, (skip, skip) */
244
245 0,0xf000|RX_START|CUC_START, /* SCB status and cmd. */
246 CONFIG_CMD, /* Command list pointer, points to Configure. */
247 RX_BUF_START, /* Rx block list. */
248 0,0,0,0, /* Error count: CRC, align, buffer, overrun. */
249
250 /* 0x0018: Configure command. Change to put MAC data with packet. */
251 0, CmdConfigure, /* Status, command. */
252 SET_SA_CMD, /* Next command is Set Station Addr. */
253 0x0804, /* "4" bytes of config data, 8 byte FIFO. */
254 0x2e40, /* Magic values, including MAC data location. */
255 0, /* Unused pad word. */
256
257 /* 0x0024: Setup station address command. */
258 0, CmdSASetup,
259 SET_MC_CMD, /* Next command. */
260 0xaa00,0xb000,0x0bad, /* Station address (to be filled in) */
261
262 /* 0x0030: NOP, looping back to itself. Point to first Tx buffer to Tx. */
263 0, CmdNOp, IDLELOOP, 0 /* pad */,
264
265 /* 0x0038: A unused Time-Domain Reflectometer command. */
266 0, CmdTDR, IDLELOOP, 0,
267
268 /* 0x0040: An unused Dump State command. */
269 0, CmdDump, IDLELOOP, DUMP_DATA,
270
271 /* 0x0048: An unused Diagnose command. */
272 0, CmdDiagnose, IDLELOOP,
273
274 /* 0x004E: An empty set-multicast-list command. */
275 #ifdef initial_text_tx
276 0, CmdMulticastList, DUMP_DATA, 0,
277 #else
278 0, CmdMulticastList, IDLELOOP, 0,
279 #endif
280
281 /* 0x0056: A continuous transmit command, only here for testing. */
282 0, CmdTx, DUMP_DATA, DUMP_DATA+8, 0x83ff, -1, DUMP_DATA, 0,
283 };
284
285 /* Index to functions, as function prototypes. */
286
287 extern int express_probe(struct device *dev); /* Called from Space.c */
288
289 static int eexp_probe1(struct device *dev, short ioaddr);
290 static int eexp_open(struct device *dev);
291 static int eexp_send_packet(struct sk_buff *skb, struct device *dev);
292 static void eexp_interrupt(int reg_ptr);
293 static void eexp_rx(struct device *dev);
294 static int eexp_close(struct device *dev);
295 static struct enet_statistics *eexp_get_stats(struct device *dev);
296 static void set_multicast_list(struct device *dev, int num_addrs, void *addrs);
297
298 static int read_eeprom(int ioaddr, int location);
299 static void hardware_send_packet(struct device *dev, void *buf, short length);
300 static void init_82586_mem(struct device *dev);
301 static void init_rx_bufs(struct device *dev);
302
303
304 /* Check for a network adaptor of this type, and return '0' iff one exists.
305 If dev->base_addr == 0, probe all likely locations.
306 If dev->base_addr == 1, always return failure.
307 If dev->base_addr == 2, (detachable devices only) allocate space for the
308 device and return success.
309 */
310 int
311 express_probe(struct device *dev)
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*/
312 {
313 /* Don't probe all settable addresses, 0x[23][0-7]0, just common ones. */
314 int *port, ports[] = {0x300, 0x270, 0x320, 0x340, 0};
315 int base_addr = dev->base_addr;
316
317 if (base_addr > 0x1ff) /* Check a single specified location. */
318 return eexp_probe1(dev, base_addr);
319 else if (base_addr > 0)
320 return ENXIO; /* Don't probe at all. */
321
322 for (port = &ports[0]; *port; port++) {
323 short id_addr = *port + ID_PORT;
324 unsigned short sum = 0;
325 int i;
326 #ifdef notdef
327 for (i = 16; i > 0; i--)
328 sum += inb(id_addr);
329 printk("EtherExpress ID checksum is %04x.\n", sum);
330 #else
331 for (i = 4; i > 0; i--) {
332 short id_val = inb(id_addr);
333 sum |= (id_val >> 4) << ((id_val & 3) << 2);
334 }
335 #endif
336 if (sum == 0xbaba
337 && eexp_probe1(dev, *port) == 0)
338 return 0;
339 }
340
341 return ENODEV; /* ENODEV would be more accurate. */
342 }
343
344 int eexp_probe1(struct device *dev, short ioaddr)
/* ![[previous]](../icons/left.png)
*/
345 {
346 unsigned short station_addr[3];
347 int i;
348
349 printk("%s: EtherExpress at %#x,", dev->name, ioaddr);
350
351 /* The station address is stored !backwards! in the EEPROM, reverse
352 after reading. (Hmmm, a little brain-damage there at Intel, eh?) */
353 station_addr[0] = read_eeprom(ioaddr, 2);
354 station_addr[1] = read_eeprom(ioaddr, 3);
355 station_addr[2] = read_eeprom(ioaddr, 4);
356
357 /* Check the first three octets of the S.A. for the manufacturer's code. */
358 if (station_addr[2] != 0x00aa || (station_addr[1] & 0xff00) != 0x0000) {
359 printk(" rejected (invalid address %04x%04x%04x).\n",
360 station_addr[2], station_addr[1], station_addr[0]);
361 return ENODEV;
362 }
363
364 /* We've committed to using the board, and can start filling in *dev. */
365 snarf_region(ioaddr, 16);
366 dev->base_addr = ioaddr;
367
368 for (i = 0; i < 6; i++) {
369 dev->dev_addr[i] = ((unsigned char*)station_addr)[5-i];
370 printk(" %02x", dev->dev_addr[i]);
371 }
372
373 /* There is no reason for the driver to care, but I print out the
374 interface to minimize bogus bug reports. */
375 {
376 char irqmap[] = {0, 9, 3, 4, 5, 10, 11, 0};
377 char *ifmap[] = {"AUI", "BNC", "10baseT"};
378 enum iftype {AUI=0, BNC=1, TP=2};
379 unsigned short setupval = read_eeprom(ioaddr, 0);
380
381 dev->irq = irqmap[setupval >> 13];
382 dev->if_port = (setupval & 0x1000) == 0 ? AUI :
383 read_eeprom(ioaddr, 5) & 0x1 ? TP : BNC;
384 printk(", IRQ %d, Interface %s.\n", dev->irq, ifmap[dev->if_port]);
385 /* Release the IRQ line so that it can be shared if we don't use the
386 ethercard. */
387 outb(0x00, ioaddr + SET_IRQ);
388 }
389
390 /* It's now OK to leave the board in reset, pending the open(). */
391 outb(ASIC_RESET, ioaddr + EEPROM_Ctrl);
392
393 if ((dev->mem_start & 0xf) > 0)
394 net_debug = dev->mem_start & 7;
395
396 if (net_debug)
397 printk(version);
398
399 /* Initialize the device structure. */
400 dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);
401 memset(dev->priv, 0, sizeof(struct net_local));
402
403 dev->open = eexp_open;
404 dev->stop = eexp_close;
405 dev->hard_start_xmit = eexp_send_packet;
406 dev->get_stats = eexp_get_stats;
407 dev->set_multicast_list = &set_multicast_list;
408
409 /* Fill in the fields of the device structure with ethernet-generic values. */
410
411 ether_setup(dev);
412
413 return 0;
414 }
415
416
417 /* Reverse IRQ map: the value to put in the SET_IRQ reg. for IRQ<index>. */
418 static char irqrmap[]={0,0,1,2,3,4,0,0,0,1,5,6,0,0,0,0};
419
420 static int
421 eexp_open(struct device *dev)
/* */
422 {
423 int ioaddr = dev->base_addr;
424
425 if (dev->irq == 0 || irqrmap[dev->irq] == 0)
426 return -ENXIO;
427
428 if (irq2dev_map[dev->irq] != 0
429 /* This is always true, but avoid the false IRQ. */
430 || (irq2dev_map[dev->irq] = dev) == 0
431 || request_irq(dev->irq, &eexp_interrupt, 0, "EExpress")) {
432 return -EAGAIN;
433 }
434
435 /* Initialize the 82586 memory and start it. */
436 init_82586_mem(dev);
437
438 /* Enable the interrupt line. */
439 outb(irqrmap[dev->irq] | 0x08, ioaddr + SET_IRQ);
440
441 dev->tbusy = 0;
442 dev->interrupt = 0;
443 dev->start = 1;
444 #ifdef MODULE
445 MOD_INC_USE_COUNT;
446 #endif
447 return 0;
448 }
449
450 static int
451 eexp_send_packet(struct sk_buff *skb, struct device *dev)
/* */
452 {
453 struct net_local *lp = (struct net_local *)dev->priv;
454 int ioaddr = dev->base_addr;
455
456 if (dev->tbusy) {
457 /* If we get here, some higher level has decided we are broken.
458 There should really be a "kick me" function call instead. */
459 int tickssofar = jiffies - dev->trans_start;
460 if (tickssofar < 5)
461 return 1;
462 if (net_debug > 1)
463 printk("%s: transmit timed out, %s? ", dev->name,
464 inw(ioaddr+SCB_STATUS) & 0x8000 ? "IRQ conflict" :
465 "network cable problem");
466 lp->stats.tx_errors++;
467 /* Try to restart the adaptor. */
468 if (lp->last_restart == lp->stats.tx_packets) {
469 if (net_debug > 1) printk("Resetting board.\n");
470 /* Completely reset the adaptor. */
471 init_82586_mem(dev);
472 } else {
473 /* Issue the channel attention signal and hope it "gets better". */
474 if (net_debug > 1) printk("Kicking board.\n");
475 outw(0xf000|CUC_START|RX_START, ioaddr + SCB_CMD);
476 outb(0, ioaddr + SIGNAL_CA);
477 lp->last_restart = lp->stats.tx_packets;
478 }
479 dev->tbusy=0;
480 dev->trans_start = jiffies;
481 }
482
483 /* If some higher layer thinks we've missed an tx-done interrupt
484 we are passed NULL. Caution: dev_tint() handles the cli()/sti()
485 itself. */
486 if (skb == NULL) {
487 dev_tint(dev);
488 return 0;
489 }
490
491 /* Block a timer-based transmit from overlapping. */
492 if (set_bit(0, (void*)&dev->tbusy) != 0)
493 printk("%s: Transmitter access conflict.\n", dev->name);
494 else {
495 short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
496 unsigned char *buf = skb->data;
497
498 /* Disable the 82586's input to the interrupt line. */
499 outb(irqrmap[dev->irq], ioaddr + SET_IRQ);
500 hardware_send_packet(dev, buf, length);
501 dev->trans_start = jiffies;
502 /* Enable the 82586 interrupt input. */
503 outb(0x08 | irqrmap[dev->irq], ioaddr + SET_IRQ);
504 }
505
506 dev_kfree_skb (skb, FREE_WRITE);
507
508 /* You might need to clean up and record Tx statistics here. */
509 lp->stats.tx_aborted_errors++;
510
511 return 0;
512 }
513
514 /* The typical workload of the driver:
515 Handle the network interface interrupts. */
516 static void
517 eexp_interrupt(int reg_ptr)
/* */
518 {
519 int irq = -(((struct pt_regs *)reg_ptr)->orig_eax+2);
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 = alloc_skb(pkt_len, GFP_ATOMIC);
945 if (skb == NULL) {
946 printk("%s: Memory squeeze, dropping packet.\n", dev->name);
947 lp->stats.rx_dropped++;
948 break;
949 }
950 skb->len = pkt_len;
951 skb->dev = dev;
952
953 outw(data_buffer_addr + 10, ioaddr + READ_PTR);
954
955 insw(ioaddr, skb->data, (pkt_len + 1) >> 1);
956
957 netif_rx(skb);
958 lp->stats.rx_packets++;
959 }
960
961 /* Clear the status word and set End-of-List on the rx frame. */
962 outw(rx_head, ioaddr + WRITE_PTR);
963 outw(0x0000, ioaddr);
964 outw(0xC000, ioaddr);
965 #ifndef final_version
966 if (next_rx_frame != rx_head + RX_BUF_SIZE
967 && next_rx_frame != RX_BUF_START) {
968 printk("%s: Rx next frame at %#x is %#x instead of %#x.\n", dev->name,
969 rx_head, next_rx_frame, rx_head + RX_BUF_SIZE);
970 next_rx_frame = rx_head + RX_BUF_SIZE;
971 if (next_rx_frame >= RX_BUF_END - RX_BUF_SIZE)
972 next_rx_frame = RX_BUF_START;
973 }
974 #endif
975 outw(rx_tail+2, ioaddr + WRITE_PTR);
976 outw(0x0000, ioaddr); /* Clear the end-of-list on the prev. RFD. */
977
978 #ifndef final_version
979 outw(rx_tail+4, ioaddr + READ_PTR);
980 if (inw(ioaddr) != rx_head) {
981 printk("%s: Rx buf link mismatch, at %04x link %04x instead of %04x.\n",
982 dev->name, rx_tail, (outw(rx_tail+4, ioaddr + READ_PTR),inw(ioaddr)),
983 rx_head);
984 outw(rx_head, ioaddr);
985 }
986 #endif
987
988 rx_tail = rx_head;
989 rx_head = next_rx_frame;
990 if (--boguscount == 0)
991 break;
992 outw(rx_head, ioaddr + READ_PTR);
993 }
994
995 lp->rx_head = rx_head;
996 lp->rx_tail = rx_tail;
997
998 /* Restore the original write pointer. */
999 outw(saved_write_ptr, ioaddr + WRITE_PTR);
1000 }
1001
1002 #ifdef MODULE
1003 char kernel_version[] = UTS_RELEASE;
1004 static struct device dev_eexpress = {
1005 " " /*"eexpress"*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, express_probe };
1006
1007 int
1008 init_module(void)
/* */
1009 {
1010 if (register_netdev(&dev_eexpress) != 0)
1011 return -EIO;
1012 return 0;
1013 }
1014
1015 void
1016 cleanup_module(void)
/* ![[last]](../icons/n_last.png)
*/
1017 {
1018 if (MOD_IN_USE)
1019 printk("express: device busy, remove delayed\n");
1020 else
1021 {
1022 unregister_netdev(&dev_eexpress);
1023 kfree_s(dev_eexpress.priv,sizeof(struct net_local));
1024 dev_eexpress.priv=NULL;
1025 }
1026 }
1027 #endif /* MODULE */
1028 /*
1029 * Local variables:
1030 * 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"
1031 * version-control: t
1032 * kept-new-versions: 5
1033 * tab-width: 4
1034 * End:
1035 */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/