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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 #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 #ifdef MODULE
41 #include <linux/module.h>
42 #include <linux/version.h>
43 #endif
44
45 #include <linux/kernel.h>
46 #include <linux/sched.h>
47 #include <linux/types.h>
48 #include <linux/fcntl.h>
49 #include <linux/interrupt.h>
50 #include <linux/ptrace.h>
51 #include <linux/ioport.h>
52 #include <linux/string.h>
53 #include <linux/in.h>
54 #include <asm/system.h>
55 #include <asm/bitops.h>
56 #include <asm/io.h>
57 #include <asm/dma.h>
58 #include <linux/errno.h>
59
60 #include <linux/netdevice.h>
61 #include <linux/etherdevice.h>
62 #include <linux/skbuff.h>
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 #define EEXPRESS_IO_EXTENT 16
149
150 /* EEPROM_Ctrl bits. */
151
152 #define EE_SHIFT_CLK 0x01 /* EEPROM shift clock. */
153 #define EE_CS 0x02 /* EEPROM chip select. */
154 #define EE_DATA_WRITE 0x04 /* EEPROM chip data in. */
155 #define EE_DATA_READ 0x08 /* EEPROM chip data out. */
156 #define EE_CTRL_BITS (EE_SHIFT_CLK | EE_CS | EE_DATA_WRITE | EE_DATA_READ)
157 #define ASIC_RESET 0x40
158 #define _586_RESET 0x80
159
160 /* Offsets to elements of the System Control Block structure. */
161 #define SCB_STATUS 0xc008
162 #define SCB_CMD 0xc00A
163 #define CUC_START 0x0100
164 #define CUC_RESUME 0x0200
165 #define CUC_SUSPEND 0x0300
166 #define RX_START 0x0010
167 #define RX_RESUME 0x0020
168 #define RX_SUSPEND 0x0030
169 #define SCB_CBL 0xc00C /* Command BLock offset. */
170 #define SCB_RFA 0xc00E /* Rx Frame Area offset. */
171
172 /*
173 What follows in 'init_words[]' is the "program" that is downloaded to the
174 82586 memory. It's mostly tables and command blocks, and starts at the
175 reset address 0xfffff6.
176
177 Even with the additional "don't care" values, doing it this way takes less
178 program space than initializing the individual tables, and I feel it's much
179 cleaner.
180
181 The databook is particularly useless for the first two structures; they are
182 completely undocumented. I had to use the Crynwr driver as an example.
183
184 The memory setup is as follows:
185 */
186
187 #define CONFIG_CMD 0x0018
188 #define SET_SA_CMD 0x0024
189 #define SA_OFFSET 0x002A
190 #define IDLELOOP 0x30
191 #define TDR_CMD 0x38
192 #define TDR_TIME 0x3C
193 #define DUMP_CMD 0x40
194 #define DIAG_CMD 0x48
195 #define SET_MC_CMD 0x4E
196 #define DUMP_DATA 0x56 /* A 170 byte buffer for dump and Set-MC into. */
197
198 #define TX_BUF_START 0x0100
199 #define NUM_TX_BUFS 4
200 #define TX_BUF_SIZE 0x0680 /* packet+header+TBD+extra (1518+14+20+16) */
201 #define TX_BUF_END 0x2000
202
203 #define RX_BUF_START 0x2000
204 #define RX_BUF_SIZE (0x640) /* packet+header+RBD+extra */
205 #define RX_BUF_END 0x4000
206
207 /*
208 That's it: only 86 bytes to set up the beast, including every extra
209 command available. The 170 byte buffer at DUMP_DATA is shared between the
210 Dump command (called only by the diagnostic program) and the SetMulticastList
211 command.
212
213 To complete the memory setup you only have to write the station address at
214 SA_OFFSET and create the Tx & Rx buffer lists.
215
216 The Tx command chain and buffer list is setup as follows:
217 A Tx command table, with the data buffer pointing to...
218 A Tx data buffer descriptor. The packet is in a single buffer, rather than
219 chaining together several smaller buffers.
220 A NoOp command, which initially points to itself,
221 And the packet data.
222
223 A transmit is done by filling in the Tx command table and data buffer,
224 re-writing the NoOp command, and finally changing the offset of the last
225 command to point to the current Tx command. When the Tx command is finished,
226 it jumps to the NoOp, when it loops until the next Tx command changes the
227 "link offset" in the NoOp. This way the 82586 never has to go through the
228 slow restart sequence.
229
230 The Rx buffer list is set up in the obvious ring structure. We have enough
231 memory (and low enough interrupt latency) that we can avoid the complicated
232 Rx buffer linked lists by alway associating a full-size Rx data buffer with
233 each Rx data frame.
234
235 I current use four transmit buffers starting at TX_BUF_START (0x0100), and
236 use the rest of memory, from RX_BUF_START to RX_BUF_END, for Rx buffers.
237
238 */
239
240 static short init_words[] = {
241 0x0000, /* Set bus size to 16 bits. */
242 0x0000,0x0000, /* Set control mailbox (SCB) addr. */
243 0,0, /* pad to 0x000000. */
244 0x0001, /* Status word that's cleared when init is done. */
245 0x0008,0,0, /* SCB offset, (skip, skip) */
246
247 0,0xf000|RX_START|CUC_START, /* SCB status and cmd. */
248 CONFIG_CMD, /* Command list pointer, points to Configure. */
249 RX_BUF_START, /* Rx block list. */
250 0,0,0,0, /* Error count: CRC, align, buffer, overrun. */
251
252 /* 0x0018: Configure command. Change to put MAC data with packet. */
253 0, CmdConfigure, /* Status, command. */
254 SET_SA_CMD, /* Next command is Set Station Addr. */
255 0x0804, /* "4" bytes of config data, 8 byte FIFO. */
256 0x2e40, /* Magic values, including MAC data location. */
257 0, /* Unused pad word. */
258
259 /* 0x0024: Setup station address command. */
260 0, CmdSASetup,
261 SET_MC_CMD, /* Next command. */
262 0xaa00,0xb000,0x0bad, /* Station address (to be filled in) */
263
264 /* 0x0030: NOP, looping back to itself. Point to first Tx buffer to Tx. */
265 0, CmdNOp, IDLELOOP, 0 /* pad */,
266
267 /* 0x0038: A unused Time-Domain Reflectometer command. */
268 0, CmdTDR, IDLELOOP, 0,
269
270 /* 0x0040: An unused Dump State command. */
271 0, CmdDump, IDLELOOP, DUMP_DATA,
272
273 /* 0x0048: An unused Diagnose command. */
274 0, CmdDiagnose, IDLELOOP,
275
276 /* 0x004E: An empty set-multicast-list command. */
277 #ifdef initial_text_tx
278 0, CmdMulticastList, DUMP_DATA, 0,
279 #else
280 0, CmdMulticastList, IDLELOOP, 0,
281 #endif
282
283 /* 0x0056: A continuous transmit command, only here for testing. */
284 0, CmdTx, DUMP_DATA, DUMP_DATA+8, 0x83ff, -1, DUMP_DATA, 0,
285 };
286
287 /* Index to functions, as function prototypes. */
288
289 extern int express_probe(struct device *dev); /* Called from Space.c */
290
291 static int eexp_probe1(struct device *dev, short ioaddr);
292 static int eexp_open(struct device *dev);
293 static int eexp_send_packet(struct sk_buff *skb, struct device *dev);
294 static void eexp_interrupt(int irq, struct pt_regs *regs);
295 static void eexp_rx(struct device *dev);
296 static int eexp_close(struct device *dev);
297 static struct enet_statistics *eexp_get_stats(struct device *dev);
298 static void set_multicast_list(struct device *dev, int num_addrs, void *addrs);
299
300 static int read_eeprom(int ioaddr, int location);
301 static void hardware_send_packet(struct device *dev, void *buf, short length);
302 static void init_82586_mem(struct device *dev);
303 static void init_rx_bufs(struct device *dev);
304
305
306 /* Check for a network adaptor of this type, and return '0' iff one exists.
307 If dev->base_addr == 0, probe all likely locations.
308 If dev->base_addr == 1, always return failure.
309 If dev->base_addr == 2, (detachable devices only) allocate space for the
310 device and return success.
311 */
312 int
313 express_probe(struct device *dev)
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*/
314 {
315 /* Don't probe all settable addresses, 0x[23][0-7]0, just common ones. */
316 int *port, ports[] = {0x300, 0x270, 0x320, 0x340, 0};
317 int base_addr = dev->base_addr;
318
319 if (base_addr > 0x1ff) /* Check a single specified location. */
320 return eexp_probe1(dev, base_addr);
321 else if (base_addr > 0)
322 return ENXIO; /* Don't probe at all. */
323
324 for (port = &ports[0]; *port; port++) {
325 short id_addr = *port + ID_PORT;
326 unsigned short sum = 0;
327 int i;
328 #ifdef notdef
329 for (i = 16; i > 0; i--)
330 sum += inb(id_addr);
331 printk("EtherExpress ID checksum is %04x.\n", sum);
332 #else
333 for (i = 4; i > 0; i--) {
334 short id_val = inb(id_addr);
335 sum |= (id_val >> 4) << ((id_val & 3) << 2);
336 }
337 #endif
338 if (sum == 0xbaba
339 && eexp_probe1(dev, *port) == 0)
340 return 0;
341 }
342
343 return ENODEV;
344 }
345
346 int eexp_probe1(struct device *dev, short ioaddr)
/* ![[previous]](../icons/left.png)
*/
347 {
348 unsigned short station_addr[3];
349 int i;
350
351 printk("%s: EtherExpress at %#x,", dev->name, ioaddr);
352
353 /* The station address is stored !backwards! in the EEPROM, reverse
354 after reading. (Hmmm, a little brain-damage there at Intel, eh?) */
355 station_addr[0] = read_eeprom(ioaddr, 2);
356 station_addr[1] = read_eeprom(ioaddr, 3);
357 station_addr[2] = read_eeprom(ioaddr, 4);
358
359 /* Check the first three octets of the S.A. for the manufacturer's code. */
360 if (station_addr[2] != 0x00aa || (station_addr[1] & 0xff00) != 0x0000) {
361 printk(" rejected (invalid address %04x%04x%04x).\n",
362 station_addr[2], station_addr[1], station_addr[0]);
363 return ENODEV;
364 }
365
366 /* We've committed to using the board, and can start filling in *dev. */
367 request_region(ioaddr, EEXPRESS_IO_EXTENT, "eexpress");
368 dev->base_addr = ioaddr;
369
370 for (i = 0; i < 6; i++) {
371 dev->dev_addr[i] = ((unsigned char*)station_addr)[5-i];
372 printk(" %02x", dev->dev_addr[i]);
373 }
374
375 /* There is no reason for the driver to care, but I print out the
376 interface to minimize bogus bug reports. */
377 {
378 char irqmap[] = {0, 9, 3, 4, 5, 10, 11, 0};
379 const char *ifmap[] = {"AUI", "BNC", "10baseT"};
380 enum iftype {AUI=0, BNC=1, TP=2};
381 unsigned short setupval = read_eeprom(ioaddr, 0);
382
383 dev->irq = irqmap[setupval >> 13];
384 dev->if_port = (setupval & 0x1000) == 0 ? AUI :
385 read_eeprom(ioaddr, 5) & 0x1 ? TP : BNC;
386 printk(", IRQ %d, Interface %s.\n", dev->irq, ifmap[dev->if_port]);
387 /* Release the IRQ line so that it can be shared if we don't use the
388 ethercard. */
389 outb(0x00, ioaddr + SET_IRQ);
390 }
391
392 /* It's now OK to leave the board in reset, pending the open(). */
393 outb(ASIC_RESET, ioaddr + EEPROM_Ctrl);
394
395 if ((dev->mem_start & 0xf) > 0)
396 net_debug = dev->mem_start & 7;
397
398 if (net_debug)
399 printk(version);
400
401 /* Initialize the device structure. */
402 dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);
403 if (dev->priv == NULL)
404 return -ENOMEM;
405 memset(dev->priv, 0, sizeof(struct net_local));
406
407 dev->open = eexp_open;
408 dev->stop = eexp_close;
409 dev->hard_start_xmit = eexp_send_packet;
410 dev->get_stats = eexp_get_stats;
411 dev->set_multicast_list = &set_multicast_list;
412
413 /* Fill in the fields of the device structure with ethernet-generic values. */
414
415 ether_setup(dev);
416
417 return 0;
418 }
419
420
421 /* Reverse IRQ map: the value to put in the SET_IRQ reg. for IRQ<index>. */
422 static char irqrmap[]={0,0,1,2,3,4,0,0,0,1,5,6,0,0,0,0};
423
424 static int
425 eexp_open(struct device *dev)
/* */
426 {
427 int ioaddr = dev->base_addr;
428
429 if (dev->irq == 0 || irqrmap[dev->irq] == 0)
430 return -ENXIO;
431
432 if (irq2dev_map[dev->irq] != 0
433 /* This is always true, but avoid the false IRQ. */
434 || (irq2dev_map[dev->irq] = dev) == 0
435 || request_irq(dev->irq, &eexp_interrupt, 0, "EExpress")) {
436 return -EAGAIN;
437 }
438
439 /* Initialize the 82586 memory and start it. */
440 init_82586_mem(dev);
441
442 /* Enable the interrupt line. */
443 outb(irqrmap[dev->irq] | 0x08, ioaddr + SET_IRQ);
444
445 dev->tbusy = 0;
446 dev->interrupt = 0;
447 dev->start = 1;
448 #ifdef MODULE
449 MOD_INC_USE_COUNT;
450 #endif
451 return 0;
452 }
453
454 static int
455 eexp_send_packet(struct sk_buff *skb, struct device *dev)
/* */
456 {
457 struct net_local *lp = (struct net_local *)dev->priv;
458 int ioaddr = dev->base_addr;
459
460 if (dev->tbusy) {
461 /* If we get here, some higher level has decided we are broken.
462 There should really be a "kick me" function call instead. */
463 int tickssofar = jiffies - dev->trans_start;
464 if (tickssofar < 5)
465 return 1;
466 if (net_debug > 1)
467 printk("%s: transmit timed out, %s? ", dev->name,
468 inw(ioaddr+SCB_STATUS) & 0x8000 ? "IRQ conflict" :
469 "network cable problem");
470 lp->stats.tx_errors++;
471 /* Try to restart the adaptor. */
472 if (lp->last_restart == lp->stats.tx_packets) {
473 if (net_debug > 1) printk("Resetting board.\n");
474 /* Completely reset the adaptor. */
475 init_82586_mem(dev);
476 } else {
477 /* Issue the channel attention signal and hope it "gets better". */
478 if (net_debug > 1) printk("Kicking board.\n");
479 outw(0xf000|CUC_START|RX_START, ioaddr + SCB_CMD);
480 outb(0, ioaddr + SIGNAL_CA);
481 lp->last_restart = lp->stats.tx_packets;
482 }
483 dev->tbusy=0;
484 dev->trans_start = jiffies;
485 }
486
487 /* If some higher layer thinks we've missed an tx-done interrupt
488 we are passed NULL. Caution: dev_tint() handles the cli()/sti()
489 itself. */
490 if (skb == NULL) {
491 dev_tint(dev);
492 return 0;
493 }
494
495 /* Block a timer-based transmit from overlapping. */
496 if (set_bit(0, (void*)&dev->tbusy) != 0)
497 printk("%s: Transmitter access conflict.\n", dev->name);
498 else {
499 short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
500 unsigned char *buf = skb->data;
501
502 /* Disable the 82586's input to the interrupt line. */
503 outb(irqrmap[dev->irq], ioaddr + SET_IRQ);
504 hardware_send_packet(dev, buf, length);
505 dev->trans_start = jiffies;
506 /* Enable the 82586 interrupt input. */
507 outb(0x08 | irqrmap[dev->irq], ioaddr + SET_IRQ);
508 }
509
510 dev_kfree_skb (skb, FREE_WRITE);
511
512 /* You might need to clean up and record Tx statistics here. */
513 lp->stats.tx_aborted_errors++;
514
515 return 0;
516 }
517
518 /* The typical workload of the driver:
519 Handle the network interface interrupts. */
520 static void
521 eexp_interrupt(int irq, struct pt_regs *regs)
/* */
522 {
523 struct device *dev = (struct device *)(irq2dev_map[irq]);
524 struct net_local *lp;
525 int ioaddr, status, boguscount = 0;
526 short ack_cmd;
527
528 if (dev == NULL) {
529 printk ("net_interrupt(): irq %d for unknown device.\n", irq);
530 return;
531 }
532 dev->interrupt = 1;
533
534 ioaddr = dev->base_addr;
535 lp = (struct net_local *)dev->priv;
536
537 status = inw(ioaddr + SCB_STATUS);
538
539 if (net_debug > 4) {
540 printk("%s: EExp interrupt, status %4.4x.\n", dev->name, status);
541 }
542
543 /* Disable the 82586's input to the interrupt line. */
544 outb(irqrmap[dev->irq], ioaddr + SET_IRQ);
545
546 /* Reap the Tx packet buffers. */
547 while (lp->tx_reap != lp->tx_head) { /* if (status & 0x8000) */
548 unsigned short tx_status;
549 outw(lp->tx_reap, ioaddr + READ_PTR);
550 tx_status = inw(ioaddr);
551 if (tx_status == 0) {
552 if (net_debug > 5) printk("Couldn't reap %#x.\n", lp->tx_reap);
553 break;
554 }
555 if (tx_status & 0x2000) {
556 lp->stats.tx_packets++;
557 lp->stats.collisions += tx_status & 0xf;
558 dev->tbusy = 0;
559 mark_bh(NET_BH); /* Inform upper layers. */
560 } else {
561 lp->stats.tx_errors++;
562 if (tx_status & 0x0600) lp->stats.tx_carrier_errors++;
563 if (tx_status & 0x0100) lp->stats.tx_fifo_errors++;
564 if (!(tx_status & 0x0040)) lp->stats.tx_heartbeat_errors++;
565 if (tx_status & 0x0020) lp->stats.tx_aborted_errors++;
566 }
567 if (net_debug > 5)
568 printk("Reaped %x, Tx status %04x.\n" , lp->tx_reap, tx_status);
569 lp->tx_reap += TX_BUF_SIZE;
570 if (lp->tx_reap > TX_BUF_END - TX_BUF_SIZE)
571 lp->tx_reap = TX_BUF_START;
572 if (++boguscount > 4)
573 break;
574 }
575
576 if (status & 0x4000) { /* Packet received. */
577 if (net_debug > 5)
578 printk("Received packet, rx_head %04x.\n", lp->rx_head);
579 eexp_rx(dev);
580 }
581
582 /* Acknowledge the interrupt sources. */
583 ack_cmd = status & 0xf000;
584
585 if ((status & 0x0700) != 0x0200 && dev->start) {
586 short saved_write_ptr = inw(ioaddr + WRITE_PTR);
587 if (net_debug > 1)
588 printk("%s: Command unit stopped, status %04x, restarting.\n",
589 dev->name, status);
590 /* If this ever occurs we must re-write the idle loop, reset
591 the Tx list, and do a complete restart of the command unit. */
592 outw(IDLELOOP, ioaddr + WRITE_PTR);
593 outw(0, ioaddr);
594 outw(CmdNOp, ioaddr);
595 outw(IDLELOOP, ioaddr);
596 outw(IDLELOOP, SCB_CBL);
597 lp->tx_cmd_link = IDLELOOP + 4;
598 lp->tx_head = lp->tx_reap = TX_BUF_START;
599 /* Restore the saved write pointer. */
600 outw(saved_write_ptr, ioaddr + WRITE_PTR);
601 ack_cmd |= CUC_START;
602 }
603
604 if ((status & 0x0070) != 0x0040 && dev->start) {
605 short saved_write_ptr = inw(ioaddr + WRITE_PTR);
606 /* The Rx unit is not ready, it must be hung. Restart the receiver by
607 initializing the rx buffers, and issuing an Rx start command. */
608 lp->stats.rx_errors++;
609 if (net_debug > 1) {
610 int cur_rxbuf = RX_BUF_START;
611 printk("%s: Rx unit stopped status %04x rx head %04x tail %04x.\n",
612 dev->name, status, lp->rx_head, lp->rx_tail);
613 while (cur_rxbuf <= RX_BUF_END - RX_BUF_SIZE) {
614 int i;
615 printk(" Rx buf at %04x:", cur_rxbuf);
616 outw(cur_rxbuf, ioaddr + READ_PTR);
617 for (i = 0; i < 0x20; i += 2)
618 printk(" %04x", inw(ioaddr));
619 printk(".\n");
620 cur_rxbuf += RX_BUF_SIZE;
621 }
622 }
623 init_rx_bufs(dev);
624 outw(RX_BUF_START, SCB_RFA);
625 outw(saved_write_ptr, ioaddr + WRITE_PTR);
626 ack_cmd |= RX_START;
627 }
628
629 outw(ack_cmd, ioaddr + SCB_CMD);
630 outb(0, ioaddr + SIGNAL_CA);
631
632 if (net_debug > 5) {
633 printk("%s: EExp exiting interrupt, status %4.4x.\n", dev->name,
634 inw(ioaddr + SCB_CMD));
635 }
636 /* Enable the 82586's input to the interrupt line. */
637 outb(irqrmap[dev->irq] | 0x08, ioaddr + SET_IRQ);
638 return;
639 }
640
641 static int
642 eexp_close(struct device *dev)
/* */
643 {
644 int ioaddr = dev->base_addr;
645
646 dev->tbusy = 1;
647 dev->start = 0;
648
649 /* Flush the Tx and disable Rx. */
650 outw(RX_SUSPEND | CUC_SUSPEND, ioaddr + SCB_CMD);
651 outb(0, ioaddr + SIGNAL_CA);
652
653 /* Disable the physical interrupt line. */
654 outb(0, ioaddr + SET_IRQ);
655
656 free_irq(dev->irq);
657
658 irq2dev_map[dev->irq] = 0;
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 char devicename[9] = { 0, };
1006 static struct device dev_eexpress = {
1007 devicename, /* device name is inserted by linux/drivers/net/net_init.c */
1008 0, 0, 0, 0,
1009 0, 0,
1010 0, 0, 0, NULL, express_probe };
1011
1012
1013 int irq=0x300;
1014 int io=0;
1015
1016 int
1017 init_module(void)
/* */
1018 {
1019 if (io == 0)
1020 printk("eexpress: You should not use auto-probing with insmod!\n");
1021 dev_eexpress.base_addr=io;
1022 dev_eexpress.irq=irq;
1023 if (register_netdev(&dev_eexpress) != 0)
1024 return -EIO;
1025 return 0;
1026 }
1027
1028 void
1029 cleanup_module(void)
/* ![[last]](../icons/n_last.png)
*/
1030 {
1031 if (MOD_IN_USE)
1032 printk("eexpress: device busy, remove delayed\n");
1033 else
1034 {
1035 unregister_netdev(&dev_eexpress);
1036 kfree_s(dev_eexpress.priv,sizeof(struct net_local));
1037 dev_eexpress.priv=NULL;
1038
1039 /* If we don't do this, we can't re-insmod it later. */
1040 release_region(dev_eexpress.base_addr, EEXPRESS_IO_EXTENT);
1041 }
1042 }
1043 #endif /* MODULE */
1044 /*
1045 * Local variables:
1046 * 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"
1047 * version-control: t
1048 * kept-new-versions: 5
1049 * tab-width: 4
1050 * End:
1051 */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/