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1.1 root 1: /* 3c507.c: An EtherLink16 device driver for Linux. */
2: /*
3: Written 1993,1994 by Donald Becker.
4:
5: Copyright 1993 United States Government as represented by the
6: Director, National Security Agency.
7:
8: This software may be used and distributed according to the terms
9: of the GNU Public License, incorporated herein by reference.
10:
11: The author may be reached as [email protected], or C/O
12: Center of Excellence in Space Data and Information Sciences
13: Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
14:
15: Thanks go to [email protected] ( Patrick Jennings)
16: and [email protected] (Rick Sladkey) for testing and bugfixes.
17: Mark Salazar <[email protected]> made the changes for cards with
18: only 16K packet buffers.
19:
20: Things remaining to do:
21: Verify that the tx and rx buffers don't have fencepost errors.
22: Move the theory of operation and memory map documentation.
23: The statistics need to be updated correctly.
24: */
25:
26: static const char *version =
27: "3c507.c:v1.10 9/23/94 Donald Becker ([email protected])\n";
28:
29:
30: #include <linux/module.h>
31:
32: /*
33: Sources:
34: This driver wouldn't have been written with the availability of the
35: Crynwr driver source code. It provided a known-working implementation
36: that filled in the gaping holes of the Intel documentation. Three cheers
37: for Russ Nelson.
38:
39: Intel Microcommunications Databook, Vol. 1, 1990. It provides just enough
40: info that the casual reader might think that it documents the i82586 :-<.
41: */
42:
43: #include <linux/kernel.h>
44: #include <linux/sched.h>
45: #include <linux/types.h>
46: #include <linux/fcntl.h>
47: #include <linux/interrupt.h>
48: #include <linux/ptrace.h>
49: #include <linux/ioport.h>
50: #include <linux/in.h>
51: #include <linux/string.h>
52: #include <asm/system.h>
53: #include <asm/bitops.h>
54: #include <asm/io.h>
55: #include <asm/dma.h>
56: #include <linux/errno.h>
57:
58: #include <linux/netdevice.h>
59: #include <linux/etherdevice.h>
60: #include <linux/skbuff.h>
61: #include <linux/malloc.h>
62:
63:
64: /* use 0 for production, 1 for verification, 2..7 for debug */
65: #ifndef NET_DEBUG
66: #define NET_DEBUG 1
67: #endif
68: static unsigned int net_debug = NET_DEBUG;
69:
70: /* A zero-terminated list of common I/O addresses to be probed. */
71: static unsigned int netcard_portlist[] =
72: { 0x300, 0x320, 0x340, 0x280, 0};
73:
1.1.1.2 root 74: static void init_rx_bufs(struct device *dev);
75:
1.1 root 76: /*
77: Details of the i82586.
78:
79: You'll really need the databook to understand the details of this part,
80: but the outline is that the i82586 has two separate processing units.
81: Both are started from a list of three configuration tables, of which only
82: the last, the System Control Block (SCB), is used after reset-time. The SCB
83: has the following fields:
84: Status word
85: Command word
86: Tx/Command block addr.
87: Rx block addr.
88: The command word accepts the following controls for the Tx and Rx units:
89: */
90:
91: #define CUC_START 0x0100
92: #define CUC_RESUME 0x0200
93: #define CUC_SUSPEND 0x0300
94: #define RX_START 0x0010
95: #define RX_RESUME 0x0020
96: #define RX_SUSPEND 0x0030
97:
98: /* The Rx unit uses a list of frame descriptors and a list of data buffer
99: descriptors. We use full-sized (1518 byte) data buffers, so there is
100: a one-to-one pairing of frame descriptors to buffer descriptors.
101:
102: The Tx ("command") unit executes a list of commands that look like:
103: Status word Written by the 82586 when the command is done.
104: Command word Command in lower 3 bits, post-command action in upper 3
105: Link word The address of the next command.
106: Parameters (as needed).
107:
108: Some definitions related to the Command Word are:
109: */
110: #define CMD_EOL 0x8000 /* The last command of the list, stop. */
111: #define CMD_SUSP 0x4000 /* Suspend after doing cmd. */
112: #define CMD_INTR 0x2000 /* Interrupt after doing cmd. */
113:
114: enum commands {
115: CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
116: CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7};
117:
118: /* Information that need to be kept for each board. */
119: struct net_local {
120: struct enet_statistics stats;
121: int last_restart;
122: ushort rx_head;
123: ushort rx_tail;
124: ushort tx_head;
125: ushort tx_cmd_link;
126: ushort tx_reap;
127: };
128:
129: /*
130: Details of the EtherLink16 Implementation
131: The 3c507 is a generic shared-memory i82586 implementation.
132: The host can map 16K, 32K, 48K, or 64K of the 64K memory into
133: 0x0[CD][08]0000, or all 64K into 0xF[02468]0000.
134: */
135:
136: /* Offsets from the base I/O address. */
137: #define SA_DATA 0 /* Station address data, or 3Com signature. */
138: #define MISC_CTRL 6 /* Switch the SA_DATA banks, and bus config bits. */
139: #define RESET_IRQ 10 /* Reset the latched IRQ line. */
140: #define SIGNAL_CA 11 /* Frob the 82586 Channel Attention line. */
141: #define ROM_CONFIG 13
142: #define MEM_CONFIG 14
143: #define IRQ_CONFIG 15
144: #define EL16_IO_EXTENT 16
145:
146: /* The ID port is used at boot-time to locate the ethercard. */
147: #define ID_PORT 0x100
148:
149: /* Offsets to registers in the mailbox (SCB). */
150: #define iSCB_STATUS 0x8
151: #define iSCB_CMD 0xA
152: #define iSCB_CBL 0xC /* Command BLock offset. */
153: #define iSCB_RFA 0xE /* Rx Frame Area offset. */
154:
155: /* Since the 3c507 maps the shared memory window so that the last byte is
156: at 82586 address FFFF, the first byte is at 82586 address 0, 16K, 32K, or
157: 48K corresponding to window sizes of 64K, 48K, 32K and 16K respectively.
158: We can account for this be setting the 'SBC Base' entry in the ISCP table
159: below for all the 16 bit offset addresses, and also adding the 'SCB Base'
160: value to all 24 bit physical addresses (in the SCP table and the TX and RX
161: Buffer Descriptors).
162: -Mark
163: */
164: #define SCB_BASE ((unsigned)64*1024 - (dev->mem_end - dev->mem_start))
165:
166: /*
167: What follows in 'init_words[]' is the "program" that is downloaded to the
168: 82586 memory. It's mostly tables and command blocks, and starts at the
169: reset address 0xfffff6. This is designed to be similar to the EtherExpress,
170: thus the unusual location of the SCB at 0x0008.
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, I had
177: 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 (1518+14+20+16) /* packet+header+TBD */
196:
197: #define RX_BUF_START 0x2000
198: #define RX_BUF_SIZE (1518+14+18) /* packet+header+RBD */
199: #define RX_BUF_END (dev->mem_end - dev->mem_start)
200:
201: /*
202: That's it: only 86 bytes to set up the beast, including every extra
203: command available. The 170 byte buffer at DUMP_DATA is shared between the
204: Dump command (called only by the diagnostic program) and the SetMulticastList
205: command.
206:
207: To complete the memory setup you only have to write the station address at
208: SA_OFFSET and create the Tx & Rx buffer lists.
209:
210: The Tx command chain and buffer list is setup as follows:
211: A Tx command table, with the data buffer pointing to...
212: A Tx data buffer descriptor. The packet is in a single buffer, rather than
213: chaining together several smaller buffers.
214: A NoOp command, which initially points to itself,
215: And the packet data.
216:
217: A transmit is done by filling in the Tx command table and data buffer,
218: re-writing the NoOp command, and finally changing the offset of the last
219: command to point to the current Tx command. When the Tx command is finished,
220: it jumps to the NoOp, when it loops until the next Tx command changes the
221: "link offset" in the NoOp. This way the 82586 never has to go through the
222: slow restart sequence.
223:
224: The Rx buffer list is set up in the obvious ring structure. We have enough
225: memory (and low enough interrupt latency) that we can avoid the complicated
226: Rx buffer linked lists by alway associating a full-size Rx data buffer with
227: each Rx data frame.
228:
229: I current use four transmit buffers starting at TX_BUF_START (0x0100), and
230: use the rest of memory, from RX_BUF_START to RX_BUF_END, for Rx buffers.
231:
232: */
233:
234: unsigned short init_words[] = {
235: /* System Configuration Pointer (SCP). */
236: 0x0000, /* Set bus size to 16 bits. */
237: 0,0, /* pad words. */
238: 0x0000,0x0000, /* ISCP phys addr, set in init_82586_mem(). */
239:
240: /* Intermediate System Configuration Pointer (ISCP). */
241: 0x0001, /* Status word that's cleared when init is done. */
242: 0x0008,0,0, /* SCB offset, (skip, skip) */
243:
244: /* System Control Block (SCB). */
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: 0, CmdMulticastList, IDLELOOP, 0,
276: };
277:
278: /* Index to functions, as function prototypes. */
279:
280: extern int el16_probe(struct device *dev); /* Called from Space.c */
281:
282: static int el16_probe1(struct device *dev, int ioaddr);
283: static int el16_open(struct device *dev);
284: static int el16_send_packet(struct sk_buff *skb, struct device *dev);
285: static void el16_interrupt(int irq, void *dev_id, struct pt_regs *regs);
286: static void el16_rx(struct device *dev);
287: static int el16_close(struct device *dev);
288: static struct enet_statistics *el16_get_stats(struct device *dev);
289:
290: static void hardware_send_packet(struct device *dev, void *buf, short length);
291: void init_82586_mem(struct device *dev);
292:
293:
294: #ifdef HAVE_DEVLIST
295: struct netdev_entry netcard_drv =
296: {"3c507", el16_probe1, EL16_IO_EXTENT, netcard_portlist};
297: #endif
298:
299: /* Check for a network adaptor of this type, and return '0' iff one exists.
300: If dev->base_addr == 0, probe all likely locations.
301: If dev->base_addr == 1, always return failure.
302: If dev->base_addr == 2, (detachable devices only) allocate space for the
303: device and return success.
304: */
305: int
306: el16_probe(struct device *dev)
307: {
308: int base_addr = dev ? dev->base_addr : 0;
309: int i;
310:
311: if (base_addr > 0x1ff) /* Check a single specified location. */
312: return el16_probe1(dev, base_addr);
313: else if (base_addr != 0)
314: return ENXIO; /* Don't probe at all. */
315:
316: for (i = 0; netcard_portlist[i]; i++) {
317: int ioaddr = netcard_portlist[i];
318: if (check_region(ioaddr, EL16_IO_EXTENT))
319: continue;
320: if (el16_probe1(dev, ioaddr) == 0)
321: return 0;
322: }
323:
324: return ENODEV;
325: }
326:
327: int el16_probe1(struct device *dev, int ioaddr)
328: {
329: static unsigned char init_ID_done = 0, version_printed = 0;
330: int i, irq, irqval;
331:
332: if (init_ID_done == 0) {
333: ushort lrs_state = 0xff;
334: /* Send the ID sequence to the ID_PORT to enable the board(s). */
335: outb(0x00, ID_PORT);
336: for(i = 0; i < 255; i++) {
337: outb(lrs_state, ID_PORT);
338: lrs_state <<= 1;
339: if (lrs_state & 0x100)
340: lrs_state ^= 0xe7;
341: }
342: outb(0x00, ID_PORT);
343: init_ID_done = 1;
344: }
345:
346: if (inb(ioaddr) == '*' && inb(ioaddr+1) == '3'
347: && inb(ioaddr+2) == 'C' && inb(ioaddr+3) == 'O')
348: ;
349: else
350: return ENODEV;
351:
352: /* Allocate a new 'dev' if needed. */
353: if (dev == NULL)
354: dev = init_etherdev(0, sizeof(struct net_local));
355:
356: if (net_debug && version_printed++ == 0)
1.1.1.3 ! root 357: printk("%s", version);
1.1 root 358:
359: printk("%s: 3c507 at %#x,", dev->name, ioaddr);
360:
361: /* We should make a few more checks here, like the first three octets of
362: the S.A. for the manufacturer's code. */
363:
364: irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
365:
366: irqval = request_irq(irq, &el16_interrupt, 0, "3c507", NULL);
367: if (irqval) {
368: printk ("unable to get IRQ %d (irqval=%d).\n", irq, irqval);
369: return EAGAIN;
370: }
371:
372: /* We've committed to using the board, and can start filling in *dev. */
373: request_region(ioaddr, EL16_IO_EXTENT, "3c507");
374: dev->base_addr = ioaddr;
375:
376: outb(0x01, ioaddr + MISC_CTRL);
377: for (i = 0; i < 6; i++) {
378: dev->dev_addr[i] = inb(ioaddr + i);
379: printk(" %02x", dev->dev_addr[i]);
380: }
381:
382: if ((dev->mem_start & 0xf) > 0)
383: net_debug = dev->mem_start & 7;
384:
385: #ifdef MEM_BASE
386: dev->mem_start = MEM_BASE;
387: dev->mem_end = dev->mem_start + 0x10000;
388: #else
389: {
390: int base;
391: int size;
392: char mem_config = inb(ioaddr + MEM_CONFIG);
393: if (mem_config & 0x20) {
394: size = 64*1024;
395: base = 0xf00000 + (mem_config & 0x08 ? 0x080000
396: : ((mem_config & 3) << 17));
397: } else {
398: size = ((mem_config & 3) + 1) << 14;
399: base = 0x0c0000 + ( (mem_config & 0x18) << 12);
400: }
401: dev->mem_start = base;
402: dev->mem_end = base + size;
403: }
404: #endif
405:
406: dev->if_port = (inb(ioaddr + ROM_CONFIG) & 0x80) ? 1 : 0;
407: dev->irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
408:
409: printk(", IRQ %d, %sternal xcvr, memory %#lx-%#lx.\n", dev->irq,
410: dev->if_port ? "ex" : "in", dev->mem_start, dev->mem_end-1);
411:
412: if (net_debug)
1.1.1.3 ! root 413: printk("%s", version);
1.1 root 414:
415: /* Initialize the device structure. */
416: dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);
417: if (dev->priv == NULL)
418: return -ENOMEM;
419: memset(dev->priv, 0, sizeof(struct net_local));
420:
421: dev->open = el16_open;
422: dev->stop = el16_close;
423: dev->hard_start_xmit = el16_send_packet;
424: dev->get_stats = el16_get_stats;
425:
426: ether_setup(dev); /* Generic ethernet behaviour */
427:
428: dev->flags&=~IFF_MULTICAST; /* Multicast doesn't work */
429:
430: return 0;
431: }
432:
433:
434:
435: static int
436: el16_open(struct device *dev)
437: {
438: irq2dev_map[dev->irq] = dev;
439:
440: /* Initialize the 82586 memory and start it. */
441: init_82586_mem(dev);
442:
443: dev->tbusy = 0;
444: dev->interrupt = 0;
445: dev->start = 1;
446:
447: MOD_INC_USE_COUNT;
448:
449: return 0;
450: }
451:
452: static int
453: el16_send_packet(struct sk_buff *skb, struct device *dev)
454: {
455: struct net_local *lp = (struct net_local *)dev->priv;
456: int ioaddr = dev->base_addr;
457: short *shmem = (short*)dev->mem_start;
458:
459: if (dev->tbusy) {
460: /* If we get here, some higher level has decided we are broken.
461: There should really be a "kick me" function call instead. */
462: int tickssofar = jiffies - dev->trans_start;
463: if (tickssofar < 5)
464: return 1;
465: if (net_debug > 1)
466: printk("%s: transmit timed out, %s? ", dev->name,
467: shmem[iSCB_STATUS>>1] & 0x8000 ? "IRQ conflict" :
468: "network cable problem");
469: /* Try to restart the adaptor. */
470: if (lp->last_restart == lp->stats.tx_packets) {
471: if (net_debug > 1) printk("Resetting board.\n");
472: /* Completely reset the adaptor. */
473: init_82586_mem(dev);
474: } else {
475: /* Issue the channel attention signal and hope it "gets better". */
476: if (net_debug > 1) printk("Kicking board.\n");
477: shmem[iSCB_CMD>>1] = 0xf000|CUC_START|RX_START;
478: outb(0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
479: lp->last_restart = lp->stats.tx_packets;
480: }
481: dev->tbusy=0;
482: dev->trans_start = jiffies;
483: }
484:
485: /* If some higher layer thinks we've missed an tx-done interrupt
486: we are passed NULL. Caution: dev_tint() handles the cli()/sti()
487: itself. */
488: if (skb == NULL) {
489: dev_tint(dev);
490: return 0;
491: }
492:
493: /* Block a timer-based transmit from overlapping. */
494: if (set_bit(0, (void*)&dev->tbusy) != 0)
495: printk("%s: Transmitter access conflict.\n", dev->name);
496: else {
497: short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
498: unsigned char *buf = skb->data;
499:
500: /* Disable the 82586's input to the interrupt line. */
501: outb(0x80, ioaddr + MISC_CTRL);
502: hardware_send_packet(dev, buf, length);
503: dev->trans_start = jiffies;
504: /* Enable the 82586 interrupt input. */
505: outb(0x84, ioaddr + MISC_CTRL);
506: }
507:
508: dev_kfree_skb (skb, FREE_WRITE);
509:
510: /* You might need to clean up and record Tx statistics here. */
511:
512: return 0;
513: }
514:
515: /* The typical workload of the driver:
516: Handle the network interface interrupts. */
517: static void
518: el16_interrupt(int irq, void *dev_id, struct pt_regs *regs)
519: {
520: struct device *dev = (struct device *)(irq2dev_map[irq]);
521: struct net_local *lp;
522: int ioaddr, status, boguscount = 0;
523: ushort ack_cmd = 0;
524: ushort *shmem;
525:
526: if (dev == NULL) {
527: printk ("net_interrupt(): irq %d for unknown device.\n", irq);
528: return;
529: }
530: dev->interrupt = 1;
531:
532: ioaddr = dev->base_addr;
533: lp = (struct net_local *)dev->priv;
534: shmem = ((ushort*)dev->mem_start);
535:
536: status = shmem[iSCB_STATUS>>1];
537:
538: if (net_debug > 4) {
539: printk("%s: 3c507 interrupt, status %4.4x.\n", dev->name, status);
540: }
541:
542: /* Disable the 82586's input to the interrupt line. */
543: outb(0x80, ioaddr + MISC_CTRL);
544:
545: /* Reap the Tx packet buffers. */
546: while (lp->tx_reap != lp->tx_head) {
547: unsigned short tx_status = shmem[lp->tx_reap>>1];
548:
549: if (tx_status == 0) {
550: if (net_debug > 5) printk("Couldn't reap %#x.\n", lp->tx_reap);
551: break;
552: }
553: if (tx_status & 0x2000) {
554: lp->stats.tx_packets++;
555: lp->stats.collisions += tx_status & 0xf;
556: dev->tbusy = 0;
557: mark_bh(NET_BH); /* Inform upper layers. */
558: } else {
559: lp->stats.tx_errors++;
560: if (tx_status & 0x0600) lp->stats.tx_carrier_errors++;
561: if (tx_status & 0x0100) lp->stats.tx_fifo_errors++;
562: if (!(tx_status & 0x0040)) lp->stats.tx_heartbeat_errors++;
563: if (tx_status & 0x0020) lp->stats.tx_aborted_errors++;
564: }
565: if (net_debug > 5)
566: printk("Reaped %x, Tx status %04x.\n" , lp->tx_reap, tx_status);
567: lp->tx_reap += TX_BUF_SIZE;
568: if (lp->tx_reap > RX_BUF_START - TX_BUF_SIZE)
569: lp->tx_reap = TX_BUF_START;
570: if (++boguscount > 4)
571: break;
572: }
573:
574: if (status & 0x4000) { /* Packet received. */
575: if (net_debug > 5)
576: printk("Received packet, rx_head %04x.\n", lp->rx_head);
577: el16_rx(dev);
578: }
579:
580: /* Acknowledge the interrupt sources. */
581: ack_cmd = status & 0xf000;
582:
583: if ((status & 0x0700) != 0x0200 && dev->start) {
584: if (net_debug)
585: printk("%s: Command unit stopped, status %04x, restarting.\n",
586: dev->name, status);
587: /* If this ever occurs we should really re-write the idle loop, reset
588: the Tx list, and do a complete restart of the command unit.
589: For now we rely on the Tx timeout if the resume doesn't work. */
590: ack_cmd |= CUC_RESUME;
591: }
592:
593: if ((status & 0x0070) != 0x0040 && dev->start) {
594: /* The Rx unit is not ready, it must be hung. Restart the receiver by
595: initializing the rx buffers, and issuing an Rx start command. */
596: if (net_debug)
597: printk("%s: Rx unit stopped, status %04x, restarting.\n",
598: dev->name, status);
599: init_rx_bufs(dev);
600: shmem[iSCB_RFA >> 1] = RX_BUF_START;
601: ack_cmd |= RX_START;
602: }
603:
604: shmem[iSCB_CMD>>1] = ack_cmd;
605: outb(0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
606:
607: /* Clear the latched interrupt. */
608: outb(0, ioaddr + RESET_IRQ);
609:
610: /* Enable the 82586's interrupt input. */
611: outb(0x84, ioaddr + MISC_CTRL);
612:
613: return;
614: }
615:
616: static int
617: el16_close(struct device *dev)
618: {
619: int ioaddr = dev->base_addr;
620: ushort *shmem = (short*)dev->mem_start;
621:
622: dev->tbusy = 1;
623: dev->start = 0;
624:
625: /* Flush the Tx and disable Rx. */
626: shmem[iSCB_CMD >> 1] = RX_SUSPEND | CUC_SUSPEND;
627: outb(0, ioaddr + SIGNAL_CA);
628:
629: /* Disable the 82586's input to the interrupt line. */
630: outb(0x80, ioaddr + MISC_CTRL);
631:
632: /* We always physically use the IRQ line, so we don't do free_irq().
633: We do remove ourselves from the map. */
634:
635: irq2dev_map[dev->irq] = 0;
636:
637: /* Update the statistics here. */
638:
639: MOD_DEC_USE_COUNT;
640:
641: return 0;
642: }
643:
644: /* Get the current statistics. This may be called with the card open or
645: closed. */
646: static struct enet_statistics *
647: el16_get_stats(struct device *dev)
648: {
649: struct net_local *lp = (struct net_local *)dev->priv;
650:
651: /* ToDo: decide if there are any useful statistics from the SCB. */
652:
653: return &lp->stats;
654: }
655:
656: /* Initialize the Rx-block list. */
657: static void
658: init_rx_bufs(struct device *dev)
659: {
660: struct net_local *lp = (struct net_local *)dev->priv;
661: unsigned short *write_ptr;
662: unsigned short SCB_base = SCB_BASE;
663:
664: int cur_rxbuf = lp->rx_head = RX_BUF_START;
665:
666: /* Initialize each Rx frame + data buffer. */
667: do { /* While there is room for one more. */
668:
669: write_ptr = (unsigned short *)(dev->mem_start + cur_rxbuf);
670:
671: *write_ptr++ = 0x0000; /* Status */
672: *write_ptr++ = 0x0000; /* Command */
673: *write_ptr++ = cur_rxbuf + RX_BUF_SIZE; /* Link */
674: *write_ptr++ = cur_rxbuf + 22; /* Buffer offset */
675: *write_ptr++ = 0x0000; /* Pad for dest addr. */
676: *write_ptr++ = 0x0000;
677: *write_ptr++ = 0x0000;
678: *write_ptr++ = 0x0000; /* Pad for source addr. */
679: *write_ptr++ = 0x0000;
680: *write_ptr++ = 0x0000;
681: *write_ptr++ = 0x0000; /* Pad for protocol. */
682:
683: *write_ptr++ = 0x0000; /* Buffer: Actual count */
684: *write_ptr++ = -1; /* Buffer: Next (none). */
685: *write_ptr++ = cur_rxbuf + 0x20 + SCB_base; /* Buffer: Address low */
686: *write_ptr++ = 0x0000;
687: /* Finally, the number of bytes in the buffer. */
688: *write_ptr++ = 0x8000 + RX_BUF_SIZE-0x20;
689:
690: lp->rx_tail = cur_rxbuf;
691: cur_rxbuf += RX_BUF_SIZE;
692: } while (cur_rxbuf <= RX_BUF_END - RX_BUF_SIZE);
693:
694: /* Terminate the list by setting the EOL bit, and wrap the pointer to make
695: the list a ring. */
696: write_ptr = (unsigned short *)
697: (dev->mem_start + lp->rx_tail + 2);
698: *write_ptr++ = 0xC000; /* Command, mark as last. */
699: *write_ptr++ = lp->rx_head; /* Link */
700:
701: }
702:
703: void
704: init_82586_mem(struct device *dev)
705: {
706: struct net_local *lp = (struct net_local *)dev->priv;
707: short ioaddr = dev->base_addr;
708: ushort *shmem = (short*)dev->mem_start;
709:
710: /* Enable loopback to protect the wire while starting up,
711: and hold the 586 in reset during the memory initialization. */
712: outb(0x20, ioaddr + MISC_CTRL);
713:
714: /* Fix the ISCP address and base. */
715: init_words[3] = SCB_BASE;
716: init_words[7] = SCB_BASE;
717:
718: /* Write the words at 0xfff6 (address-aliased to 0xfffff6). */
719: memcpy((void*)dev->mem_end-10, init_words, 10);
720:
721: /* Write the words at 0x0000. */
722: memcpy((char*)dev->mem_start, init_words + 5, sizeof(init_words) - 10);
723:
724: /* Fill in the station address. */
725: memcpy((char*)dev->mem_start+SA_OFFSET, dev->dev_addr,
726: sizeof(dev->dev_addr));
727:
728: /* The Tx-block list is written as needed. We just set up the values. */
729: lp->tx_cmd_link = IDLELOOP + 4;
730: lp->tx_head = lp->tx_reap = TX_BUF_START;
731:
732: init_rx_bufs(dev);
733:
734: /* Start the 586 by releasing the reset line, but leave loopback. */
735: outb(0xA0, ioaddr + MISC_CTRL);
736:
737: /* This was time consuming to track down: you need to give two channel
738: attention signals to reliably start up the i82586. */
739: outb(0, ioaddr + SIGNAL_CA);
740:
741: {
742: int boguscnt = 50;
743: while (shmem[iSCB_STATUS>>1] == 0)
744: if (--boguscnt == 0) {
745: printk("%s: i82586 initialization timed out with status %04x,"
746: "cmd %04x.\n", dev->name,
747: shmem[iSCB_STATUS>>1], shmem[iSCB_CMD>>1]);
748: break;
749: }
750: /* Issue channel-attn -- the 82586 won't start. */
751: outb(0, ioaddr + SIGNAL_CA);
752: }
753:
754: /* Disable loopback and enable interrupts. */
755: outb(0x84, ioaddr + MISC_CTRL);
756: if (net_debug > 4)
757: printk("%s: Initialized 82586, status %04x.\n", dev->name,
758: shmem[iSCB_STATUS>>1]);
759: return;
760: }
761:
762: static void
763: hardware_send_packet(struct device *dev, void *buf, short length)
764: {
765: struct net_local *lp = (struct net_local *)dev->priv;
766: short ioaddr = dev->base_addr;
767: ushort tx_block = lp->tx_head;
768: ushort *write_ptr = (ushort *)(dev->mem_start + tx_block);
769:
770: /* Set the write pointer to the Tx block, and put out the header. */
771: *write_ptr++ = 0x0000; /* Tx status */
772: *write_ptr++ = CMD_INTR|CmdTx; /* Tx command */
773: *write_ptr++ = tx_block+16; /* Next command is a NoOp. */
774: *write_ptr++ = tx_block+8; /* Data Buffer offset. */
775:
776: /* Output the data buffer descriptor. */
777: *write_ptr++ = length | 0x8000; /* Byte count parameter. */
778: *write_ptr++ = -1; /* No next data buffer. */
779: *write_ptr++ = tx_block+22+SCB_BASE;/* Buffer follows the NoOp command. */
780: *write_ptr++ = 0x0000; /* Buffer address high bits (always zero). */
781:
782: /* Output the Loop-back NoOp command. */
783: *write_ptr++ = 0x0000; /* Tx status */
784: *write_ptr++ = CmdNOp; /* Tx command */
785: *write_ptr++ = tx_block+16; /* Next is myself. */
786:
787: /* Output the packet at the write pointer. */
788: memcpy(write_ptr, buf, length);
789:
790: /* Set the old command link pointing to this send packet. */
791: *(ushort*)(dev->mem_start + lp->tx_cmd_link) = tx_block;
792: lp->tx_cmd_link = tx_block + 20;
793:
794: /* Set the next free tx region. */
795: lp->tx_head = tx_block + TX_BUF_SIZE;
796: if (lp->tx_head > RX_BUF_START - TX_BUF_SIZE)
797: lp->tx_head = TX_BUF_START;
798:
799: if (net_debug > 4) {
800: printk("%s: 3c507 @%x send length = %d, tx_block %3x, next %3x.\n",
801: dev->name, ioaddr, length, tx_block, lp->tx_head);
802: }
803:
804: if (lp->tx_head != lp->tx_reap)
805: dev->tbusy = 0;
806: }
807:
808: static void
809: el16_rx(struct device *dev)
810: {
811: struct net_local *lp = (struct net_local *)dev->priv;
812: short *shmem = (short*)dev->mem_start;
813: ushort rx_head = lp->rx_head;
814: ushort rx_tail = lp->rx_tail;
815: ushort boguscount = 10;
816: short frame_status;
817:
818: while ((frame_status = shmem[rx_head>>1]) < 0) { /* Command complete */
819: ushort *read_frame = (short *)(dev->mem_start + rx_head);
820: ushort rfd_cmd = read_frame[1];
821: ushort next_rx_frame = read_frame[2];
822: ushort data_buffer_addr = read_frame[3];
823: ushort *data_frame = (short *)(dev->mem_start + data_buffer_addr);
824: ushort pkt_len = data_frame[0];
825:
826: if (rfd_cmd != 0 || data_buffer_addr != rx_head + 22
827: || (pkt_len & 0xC000) != 0xC000) {
828: printk("%s: Rx frame at %#x corrupted, status %04x cmd %04x"
829: "next %04x data-buf @%04x %04x.\n", dev->name, rx_head,
830: frame_status, rfd_cmd, next_rx_frame, data_buffer_addr,
831: pkt_len);
832: } else if ((frame_status & 0x2000) == 0) {
833: /* Frame Rxed, but with error. */
834: lp->stats.rx_errors++;
835: if (frame_status & 0x0800) lp->stats.rx_crc_errors++;
836: if (frame_status & 0x0400) lp->stats.rx_frame_errors++;
837: if (frame_status & 0x0200) lp->stats.rx_fifo_errors++;
838: if (frame_status & 0x0100) lp->stats.rx_over_errors++;
839: if (frame_status & 0x0080) lp->stats.rx_length_errors++;
840: } else {
841: /* Malloc up new buffer. */
842: struct sk_buff *skb;
843:
844: pkt_len &= 0x3fff;
845: skb = dev_alloc_skb(pkt_len+2);
846: if (skb == NULL) {
847: printk("%s: Memory squeeze, dropping packet.\n", dev->name);
848: lp->stats.rx_dropped++;
849: break;
850: }
851:
852: skb_reserve(skb,2);
853: skb->dev = dev;
854:
855: /* 'skb->data' points to the start of sk_buff data area. */
856: memcpy(skb_put(skb,pkt_len), data_frame + 5, pkt_len);
857:
858: skb->protocol=eth_type_trans(skb,dev);
859: netif_rx(skb);
860: lp->stats.rx_packets++;
861: }
862:
863: /* Clear the status word and set End-of-List on the rx frame. */
864: read_frame[0] = 0;
865: read_frame[1] = 0xC000;
866: /* Clear the end-of-list on the prev. RFD. */
867: *(short*)(dev->mem_start + rx_tail + 2) = 0x0000;
868:
869: rx_tail = rx_head;
870: rx_head = next_rx_frame;
871: if (--boguscount == 0)
872: break;
873: }
874:
875: lp->rx_head = rx_head;
876: lp->rx_tail = rx_tail;
877: }
878: #ifdef MODULE
879: static char devicename[9] = { 0, };
880: static struct device dev_3c507 = {
881: devicename, /* device name is inserted by linux/drivers/net/net_init.c */
882: 0, 0, 0, 0,
883: 0, 0,
884: 0, 0, 0, NULL, el16_probe
885: };
886:
887: static int io = 0x300;
888: static int irq = 0;
889:
890: int init_module(void)
891: {
892: if (io == 0)
893: printk("3c507: You should not use auto-probing with insmod!\n");
894: dev_3c507.base_addr = io;
895: dev_3c507.irq = irq;
896: if (register_netdev(&dev_3c507) != 0) {
897: printk("3c507: register_netdev() returned non-zero.\n");
898: return -EIO;
899: }
900: return 0;
901: }
902:
903: void
904: cleanup_module(void)
905: {
906: unregister_netdev(&dev_3c507);
907: kfree(dev_3c507.priv);
908: dev_3c507.priv = NULL;
909:
910: /* If we don't do this, we can't re-insmod it later. */
911: free_irq(dev_3c507.irq, NULL);
912: release_region(dev_3c507.base_addr, EL16_IO_EXTENT);
913: }
914: #endif /* MODULE */
915:
916: /*
917: * Local variables:
918: * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -I/usr/src/linux/drivers/net -Wall -Wstrict-prototypes -O6 -m486 -c 3c507.c"
919: * version-control: t
920: * kept-new-versions: 5
921: * tab-width: 4
922: * c-indent-level: 4
923: * End:
924: */
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