1 /* 3c507.c: An EtherLink16 device driver for Linux. */
3 Written 1993,1994 by Donald Becker.
5 Copyright 1993 United States Government as represented by the
6 Director, National Security Agency.
8 This software may be used and distributed according to the terms
9 of the GNU General Public License, incorporated herein by reference.
11 The author may be reached as becker@scyld.com, or C/O
12 Scyld Computing Corporation
13 410 Severn Ave., Suite 210
17 Thanks go to jennings@Montrouge.SMR.slb.com ( Patrick Jennings)
18 and jrs@world.std.com (Rick Sladkey) for testing and bugfixes.
19 Mark Salazar <leslie@access.digex.net> made the changes for cards with
20 only 16K packet buffers.
22 Things remaining to do:
23 Verify that the tx and rx buffers don't have fencepost errors.
24 Move the theory of operation and memory map documentation.
25 The statistics need to be updated correctly.
28 #define DRV_NAME "3c507"
29 #define DRV_VERSION "1.10a"
30 #define DRV_RELDATE "11/17/2001"
32 static const char version[] =
33 DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " Donald Becker (becker@scyld.com)\n";
37 This driver wouldn't have been written with the availability of the
38 Crynwr driver source code. It provided a known-working implementation
39 that filled in the gaping holes of the Intel documentation. Three cheers
42 Intel Microcommunications Databook, Vol. 1, 1990. It provides just enough
43 info that the casual reader might think that it documents the i82586 :-<.
46 #include <linux/module.h>
47 #include <linux/kernel.h>
48 #include <linux/types.h>
49 #include <linux/fcntl.h>
50 #include <linux/interrupt.h>
51 #include <linux/ioport.h>
53 #include <linux/string.h>
54 #include <linux/spinlock.h>
55 #include <linux/ethtool.h>
56 #include <linux/errno.h>
57 #include <linux/netdevice.h>
58 #include <linux/etherdevice.h>
59 #include <linux/skbuff.h>
60 #include <linux/slab.h>
61 #include <linux/init.h>
62 #include <linux/bitops.h>
66 #include <asm/system.h>
67 #include <asm/uaccess.h>
69 /* use 0 for production, 1 for verification, 2..7 for debug */
73 static unsigned int net_debug = NET_DEBUG;
74 #define debug net_debug
78 Details of the i82586.
80 You'll really need the databook to understand the details of this part,
81 but the outline is that the i82586 has two separate processing units.
82 Both are started from a list of three configuration tables, of which only
83 the last, the System Control Block (SCB), is used after reset-time. The SCB
84 has the following fields:
87 Tx/Command block addr.
89 The command word accepts the following controls for the Tx and Rx units:
92 #define CUC_START 0x0100
93 #define CUC_RESUME 0x0200
94 #define CUC_SUSPEND 0x0300
95 #define RX_START 0x0010
96 #define RX_RESUME 0x0020
97 #define RX_SUSPEND 0x0030
99 /* The Rx unit uses a list of frame descriptors and a list of data buffer
100 descriptors. We use full-sized (1518 byte) data buffers, so there is
101 a one-to-one pairing of frame descriptors to buffer descriptors.
103 The Tx ("command") unit executes a list of commands that look like:
104 Status word Written by the 82586 when the command is done.
105 Command word Command in lower 3 bits, post-command action in upper 3
106 Link word The address of the next command.
107 Parameters (as needed).
109 Some definitions related to the Command Word are:
111 #define CMD_EOL 0x8000 /* The last command of the list, stop. */
112 #define CMD_SUSP 0x4000 /* Suspend after doing cmd. */
113 #define CMD_INTR 0x2000 /* Interrupt after doing cmd. */
116 CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
117 CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7};
119 /* Information that need to be kept for each board. */
121 struct net_device_stats stats;
128 ushort tx_pkts_in_ring;
134 Details of the EtherLink16 Implementation
135 The 3c507 is a generic shared-memory i82586 implementation.
136 The host can map 16K, 32K, 48K, or 64K of the 64K memory into
137 0x0[CD][08]0000, or all 64K into 0xF[02468]0000.
140 /* Offsets from the base I/O address. */
141 #define SA_DATA 0 /* Station address data, or 3Com signature. */
142 #define MISC_CTRL 6 /* Switch the SA_DATA banks, and bus config bits. */
143 #define RESET_IRQ 10 /* Reset the latched IRQ line. */
144 #define SIGNAL_CA 11 /* Frob the 82586 Channel Attention line. */
145 #define ROM_CONFIG 13
146 #define MEM_CONFIG 14
147 #define IRQ_CONFIG 15
148 #define EL16_IO_EXTENT 16
150 /* The ID port is used at boot-time to locate the ethercard. */
151 #define ID_PORT 0x100
153 /* Offsets to registers in the mailbox (SCB). */
154 #define iSCB_STATUS 0x8
156 #define iSCB_CBL 0xC /* Command BLock offset. */
157 #define iSCB_RFA 0xE /* Rx Frame Area offset. */
159 /* Since the 3c507 maps the shared memory window so that the last byte is
160 at 82586 address FFFF, the first byte is at 82586 address 0, 16K, 32K, or
161 48K corresponding to window sizes of 64K, 48K, 32K and 16K respectively.
162 We can account for this be setting the 'SBC Base' entry in the ISCP table
163 below for all the 16 bit offset addresses, and also adding the 'SCB Base'
164 value to all 24 bit physical addresses (in the SCP table and the TX and RX
168 #define SCB_BASE ((unsigned)64*1024 - (dev->mem_end - dev->mem_start))
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. This is designed to be similar to the EtherExpress,
174 thus the unusual location of the SCB at 0x0008.
176 Even with the additional "don't care" values, doing it this way takes less
177 program space than initializing the individual tables, and I feel it's much
180 The databook is particularly useless for the first two structures, I had
181 to use the Crynwr driver as an example.
183 The memory setup is as follows:
186 #define CONFIG_CMD 0x0018
187 #define SET_SA_CMD 0x0024
188 #define SA_OFFSET 0x002A
189 #define IDLELOOP 0x30
191 #define TDR_TIME 0x3C
192 #define DUMP_CMD 0x40
193 #define DIAG_CMD 0x48
194 #define SET_MC_CMD 0x4E
195 #define DUMP_DATA 0x56 /* A 170 byte buffer for dump and Set-MC into. */
197 #define TX_BUF_START 0x0100
198 #define NUM_TX_BUFS 5
199 #define TX_BUF_SIZE (1518+14+20+16) /* packet+header+TBD */
201 #define RX_BUF_START 0x2000
202 #define RX_BUF_SIZE (1518+14+18) /* packet+header+RBD */
203 #define RX_BUF_END (dev->mem_end - dev->mem_start)
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
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.
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,
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.
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
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.
240 static unsigned short init_words[] = {
241 /* System Configuration Pointer (SCP). */
242 0x0000, /* Set bus size to 16 bits. */
243 0,0, /* pad words. */
244 0x0000,0x0000, /* ISCP phys addr, set in init_82586_mem(). */
246 /* Intermediate System Configuration Pointer (ISCP). */
247 0x0001, /* Status word that's cleared when init is done. */
248 0x0008,0,0, /* SCB offset, (skip, skip) */
250 /* System Control Block (SCB). */
251 0,0xf000|RX_START|CUC_START, /* SCB status and cmd. */
252 CONFIG_CMD, /* Command list pointer, points to Configure. */
253 RX_BUF_START, /* Rx block list. */
254 0,0,0,0, /* Error count: CRC, align, buffer, overrun. */
256 /* 0x0018: Configure command. Change to put MAC data with packet. */
257 0, CmdConfigure, /* Status, command. */
258 SET_SA_CMD, /* Next command is Set Station Addr. */
259 0x0804, /* "4" bytes of config data, 8 byte FIFO. */
260 0x2e40, /* Magic values, including MAC data location. */
261 0, /* Unused pad word. */
263 /* 0x0024: Setup station address command. */
265 SET_MC_CMD, /* Next command. */
266 0xaa00,0xb000,0x0bad, /* Station address (to be filled in) */
268 /* 0x0030: NOP, looping back to itself. Point to first Tx buffer to Tx. */
269 0, CmdNOp, IDLELOOP, 0 /* pad */,
271 /* 0x0038: A unused Time-Domain Reflectometer command. */
272 0, CmdTDR, IDLELOOP, 0,
274 /* 0x0040: An unused Dump State command. */
275 0, CmdDump, IDLELOOP, DUMP_DATA,
277 /* 0x0048: An unused Diagnose command. */
278 0, CmdDiagnose, IDLELOOP,
280 /* 0x004E: An empty set-multicast-list command. */
281 0, CmdMulticastList, IDLELOOP, 0,
284 /* Index to functions, as function prototypes. */
286 static int el16_probe1(struct net_device *dev, int ioaddr);
287 static int el16_open(struct net_device *dev);
288 static int el16_send_packet(struct sk_buff *skb, struct net_device *dev);
289 static irqreturn_t el16_interrupt(int irq, void *dev_id);
290 static void el16_rx(struct net_device *dev);
291 static int el16_close(struct net_device *dev);
292 static struct net_device_stats *el16_get_stats(struct net_device *dev);
293 static void el16_tx_timeout (struct net_device *dev);
295 static void hardware_send_packet(struct net_device *dev, void *buf, short length, short pad);
296 static void init_82586_mem(struct net_device *dev);
297 static const struct ethtool_ops netdev_ethtool_ops;
298 static void init_rx_bufs(struct net_device *);
300 static int io = 0x300;
302 static int mem_start;
305 /* Check for a network adaptor of this type, and return '0' iff one exists.
306 If dev->base_addr == 0, probe all likely locations.
307 If dev->base_addr == 1, always return failure.
308 If dev->base_addr == 2, (detachable devices only) allocate space for the
309 device and return success.
312 struct net_device * __init el16_probe(int unit)
314 struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
315 static unsigned ports[] = { 0x300, 0x320, 0x340, 0x280, 0};
320 return ERR_PTR(-ENODEV);
323 sprintf(dev->name, "eth%d", unit);
324 netdev_boot_setup_check(dev);
327 mem_start = dev->mem_start & 15;
330 if (io > 0x1ff) /* Check a single specified location. */
331 err = el16_probe1(dev, io);
333 err = -ENXIO; /* Don't probe at all. */
335 for (port = ports; *port; port++) {
336 err = el16_probe1(dev, *port);
344 err = register_netdev(dev);
349 free_irq(dev->irq, dev);
350 iounmap(((struct net_local *)netdev_priv(dev))->base);
351 release_region(dev->base_addr, EL16_IO_EXTENT);
357 static int __init el16_probe1(struct net_device *dev, int ioaddr)
359 static unsigned char init_ID_done, version_printed;
360 int i, irq, irqval, retval;
361 struct net_local *lp;
363 if (init_ID_done == 0) {
364 ushort lrs_state = 0xff;
365 /* Send the ID sequence to the ID_PORT to enable the board(s). */
367 for(i = 0; i < 255; i++) {
368 outb(lrs_state, ID_PORT);
370 if (lrs_state & 0x100)
377 if (!request_region(ioaddr, EL16_IO_EXTENT, DRV_NAME))
380 if ((inb(ioaddr) != '*') || (inb(ioaddr + 1) != '3') ||
381 (inb(ioaddr + 2) != 'C') || (inb(ioaddr + 3) != 'O')) {
386 if (net_debug && version_printed++ == 0)
389 printk("%s: 3c507 at %#x,", dev->name, ioaddr);
391 /* We should make a few more checks here, like the first three octets of
392 the S.A. for the manufacturer's code. */
394 irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
396 irqval = request_irq(irq, &el16_interrupt, 0, DRV_NAME, dev);
398 printk(KERN_ERR "3c507: unable to get IRQ %d (irqval=%d).\n", irq, irqval);
403 /* We've committed to using the board, and can start filling in *dev. */
404 dev->base_addr = ioaddr;
406 outb(0x01, ioaddr + MISC_CTRL);
407 for (i = 0; i < 6; i++) {
408 dev->dev_addr[i] = inb(ioaddr + i);
409 printk(" %02x", dev->dev_addr[i]);
413 net_debug = mem_start & 7;
416 dev->mem_start = MEM_BASE;
417 dev->mem_end = dev->mem_start + 0x10000;
422 char mem_config = inb(ioaddr + MEM_CONFIG);
423 if (mem_config & 0x20) {
425 base = 0xf00000 + (mem_config & 0x08 ? 0x080000
426 : ((mem_config & 3) << 17));
428 size = ((mem_config & 3) + 1) << 14;
429 base = 0x0c0000 + ( (mem_config & 0x18) << 12);
431 dev->mem_start = base;
432 dev->mem_end = base + size;
436 dev->if_port = (inb(ioaddr + ROM_CONFIG) & 0x80) ? 1 : 0;
437 dev->irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
439 printk(", IRQ %d, %sternal xcvr, memory %#lx-%#lx.\n", dev->irq,
440 dev->if_port ? "ex" : "in", dev->mem_start, dev->mem_end-1);
445 lp = netdev_priv(dev);
446 memset(lp, 0, sizeof(*lp));
447 spin_lock_init(&lp->lock);
448 lp->base = ioremap(dev->mem_start, RX_BUF_END);
450 printk(KERN_ERR "3c507: unable to remap memory\n");
455 dev->open = el16_open;
456 dev->stop = el16_close;
457 dev->hard_start_xmit = el16_send_packet;
458 dev->get_stats = el16_get_stats;
459 dev->tx_timeout = el16_tx_timeout;
460 dev->watchdog_timeo = TX_TIMEOUT;
461 dev->ethtool_ops = &netdev_ethtool_ops;
462 dev->flags &= ~IFF_MULTICAST; /* Multicast doesn't work */
465 free_irq(dev->irq, dev);
467 release_region(ioaddr, EL16_IO_EXTENT);
471 static int el16_open(struct net_device *dev)
473 /* Initialize the 82586 memory and start it. */
476 netif_start_queue(dev);
481 static void el16_tx_timeout (struct net_device *dev)
483 struct net_local *lp = netdev_priv(dev);
484 int ioaddr = dev->base_addr;
485 void __iomem *shmem = lp->base;
488 printk ("%s: transmit timed out, %s? ", dev->name,
489 readw(shmem + iSCB_STATUS) & 0x8000 ? "IRQ conflict" :
490 "network cable problem");
491 /* Try to restart the adaptor. */
492 if (lp->last_restart == lp->stats.tx_packets) {
494 printk ("Resetting board.\n");
495 /* Completely reset the adaptor. */
496 init_82586_mem (dev);
497 lp->tx_pkts_in_ring = 0;
499 /* Issue the channel attention signal and hope it "gets better". */
501 printk ("Kicking board.\n");
502 writew(0xf000 | CUC_START | RX_START, shmem + iSCB_CMD);
503 outb (0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
504 lp->last_restart = lp->stats.tx_packets;
506 dev->trans_start = jiffies;
507 netif_wake_queue (dev);
511 static int el16_send_packet (struct sk_buff *skb, struct net_device *dev)
513 struct net_local *lp = netdev_priv(dev);
514 int ioaddr = dev->base_addr;
516 short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
517 unsigned char *buf = skb->data;
519 netif_stop_queue (dev);
521 spin_lock_irqsave (&lp->lock, flags);
523 lp->stats.tx_bytes += length;
524 /* Disable the 82586's input to the interrupt line. */
525 outb (0x80, ioaddr + MISC_CTRL);
527 hardware_send_packet (dev, buf, skb->len, length - skb->len);
529 dev->trans_start = jiffies;
530 /* Enable the 82586 interrupt input. */
531 outb (0x84, ioaddr + MISC_CTRL);
533 spin_unlock_irqrestore (&lp->lock, flags);
537 /* You might need to clean up and record Tx statistics here. */
542 /* The typical workload of the driver:
543 Handle the network interface interrupts. */
544 static irqreturn_t el16_interrupt(int irq, void *dev_id)
546 struct net_device *dev = dev_id;
547 struct net_local *lp;
548 int ioaddr, status, boguscount = 0;
553 printk ("net_interrupt(): irq %d for unknown device.\n", irq);
557 ioaddr = dev->base_addr;
558 lp = netdev_priv(dev);
561 spin_lock(&lp->lock);
563 status = readw(shmem+iSCB_STATUS);
566 printk("%s: 3c507 interrupt, status %4.4x.\n", dev->name, status);
569 /* Disable the 82586's input to the interrupt line. */
570 outb(0x80, ioaddr + MISC_CTRL);
572 /* Reap the Tx packet buffers. */
573 while (lp->tx_pkts_in_ring) {
574 unsigned short tx_status = readw(shmem+lp->tx_reap);
575 if (!(tx_status & 0x8000)) {
577 printk("Tx command incomplete (%#x).\n", lp->tx_reap);
580 /* Tx unsuccessful or some interesting status bit set. */
581 if (!(tx_status & 0x2000) || (tx_status & 0x0f3f)) {
582 lp->stats.tx_errors++;
583 if (tx_status & 0x0600) lp->stats.tx_carrier_errors++;
584 if (tx_status & 0x0100) lp->stats.tx_fifo_errors++;
585 if (!(tx_status & 0x0040)) lp->stats.tx_heartbeat_errors++;
586 if (tx_status & 0x0020) lp->stats.tx_aborted_errors++;
587 lp->stats.collisions += tx_status & 0xf;
589 lp->stats.tx_packets++;
591 printk("Reaped %x, Tx status %04x.\n" , lp->tx_reap, tx_status);
592 lp->tx_reap += TX_BUF_SIZE;
593 if (lp->tx_reap > RX_BUF_START - TX_BUF_SIZE)
594 lp->tx_reap = TX_BUF_START;
596 lp->tx_pkts_in_ring--;
597 /* There is always more space in the Tx ring buffer now. */
598 netif_wake_queue(dev);
600 if (++boguscount > 10)
604 if (status & 0x4000) { /* Packet received. */
606 printk("Received packet, rx_head %04x.\n", lp->rx_head);
610 /* Acknowledge the interrupt sources. */
611 ack_cmd = status & 0xf000;
613 if ((status & 0x0700) != 0x0200 && netif_running(dev)) {
615 printk("%s: Command unit stopped, status %04x, restarting.\n",
617 /* If this ever occurs we should really re-write the idle loop, reset
618 the Tx list, and do a complete restart of the command unit.
619 For now we rely on the Tx timeout if the resume doesn't work. */
620 ack_cmd |= CUC_RESUME;
623 if ((status & 0x0070) != 0x0040 && netif_running(dev)) {
624 /* The Rx unit is not ready, it must be hung. Restart the receiver by
625 initializing the rx buffers, and issuing an Rx start command. */
627 printk("%s: Rx unit stopped, status %04x, restarting.\n",
630 writew(RX_BUF_START,shmem+iSCB_RFA);
634 writew(ack_cmd,shmem+iSCB_CMD);
635 outb(0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
637 /* Clear the latched interrupt. */
638 outb(0, ioaddr + RESET_IRQ);
640 /* Enable the 82586's interrupt input. */
641 outb(0x84, ioaddr + MISC_CTRL);
642 spin_unlock(&lp->lock);
646 static int el16_close(struct net_device *dev)
648 struct net_local *lp = netdev_priv(dev);
649 int ioaddr = dev->base_addr;
650 void __iomem *shmem = lp->base;
652 netif_stop_queue(dev);
654 /* Flush the Tx and disable Rx. */
655 writew(RX_SUSPEND | CUC_SUSPEND,shmem+iSCB_CMD);
656 outb(0, ioaddr + SIGNAL_CA);
658 /* Disable the 82586's input to the interrupt line. */
659 outb(0x80, ioaddr + MISC_CTRL);
661 /* We always physically use the IRQ line, so we don't do free_irq(). */
663 /* Update the statistics here. */
668 /* Get the current statistics. This may be called with the card open or
670 static struct net_device_stats *el16_get_stats(struct net_device *dev)
672 struct net_local *lp = netdev_priv(dev);
674 /* ToDo: decide if there are any useful statistics from the SCB. */
679 /* Initialize the Rx-block list. */
680 static void init_rx_bufs(struct net_device *dev)
682 struct net_local *lp = netdev_priv(dev);
683 void __iomem *write_ptr;
684 unsigned short SCB_base = SCB_BASE;
686 int cur_rxbuf = lp->rx_head = RX_BUF_START;
688 /* Initialize each Rx frame + data buffer. */
689 do { /* While there is room for one more. */
691 write_ptr = lp->base + cur_rxbuf;
693 writew(0x0000,write_ptr); /* Status */
694 writew(0x0000,write_ptr+=2); /* Command */
695 writew(cur_rxbuf + RX_BUF_SIZE,write_ptr+=2); /* Link */
696 writew(cur_rxbuf + 22,write_ptr+=2); /* Buffer offset */
697 writew(0x0000,write_ptr+=2); /* Pad for dest addr. */
698 writew(0x0000,write_ptr+=2);
699 writew(0x0000,write_ptr+=2);
700 writew(0x0000,write_ptr+=2); /* Pad for source addr. */
701 writew(0x0000,write_ptr+=2);
702 writew(0x0000,write_ptr+=2);
703 writew(0x0000,write_ptr+=2); /* Pad for protocol. */
705 writew(0x0000,write_ptr+=2); /* Buffer: Actual count */
706 writew(-1,write_ptr+=2); /* Buffer: Next (none). */
707 writew(cur_rxbuf + 0x20 + SCB_base,write_ptr+=2);/* Buffer: Address low */
708 writew(0x0000,write_ptr+=2);
709 /* Finally, the number of bytes in the buffer. */
710 writew(0x8000 + RX_BUF_SIZE-0x20,write_ptr+=2);
712 lp->rx_tail = cur_rxbuf;
713 cur_rxbuf += RX_BUF_SIZE;
714 } while (cur_rxbuf <= RX_BUF_END - RX_BUF_SIZE);
716 /* Terminate the list by setting the EOL bit, and wrap the pointer to make
718 write_ptr = lp->base + lp->rx_tail + 2;
719 writew(0xC000,write_ptr); /* Command, mark as last. */
720 writew(lp->rx_head,write_ptr+2); /* Link */
723 static void init_82586_mem(struct net_device *dev)
725 struct net_local *lp = netdev_priv(dev);
726 short ioaddr = dev->base_addr;
727 void __iomem *shmem = lp->base;
729 /* Enable loopback to protect the wire while starting up,
730 and hold the 586 in reset during the memory initialization. */
731 outb(0x20, ioaddr + MISC_CTRL);
733 /* Fix the ISCP address and base. */
734 init_words[3] = SCB_BASE;
735 init_words[7] = SCB_BASE;
737 /* Write the words at 0xfff6 (address-aliased to 0xfffff6). */
738 memcpy_toio(lp->base + RX_BUF_END - 10, init_words, 10);
740 /* Write the words at 0x0000. */
741 memcpy_toio(lp->base, init_words + 5, sizeof(init_words) - 10);
743 /* Fill in the station address. */
744 memcpy_toio(lp->base+SA_OFFSET, dev->dev_addr,
745 sizeof(dev->dev_addr));
747 /* The Tx-block list is written as needed. We just set up the values. */
748 lp->tx_cmd_link = IDLELOOP + 4;
749 lp->tx_head = lp->tx_reap = TX_BUF_START;
753 /* Start the 586 by releasing the reset line, but leave loopback. */
754 outb(0xA0, ioaddr + MISC_CTRL);
756 /* This was time consuming to track down: you need to give two channel
757 attention signals to reliably start up the i82586. */
758 outb(0, ioaddr + SIGNAL_CA);
762 while (readw(shmem+iSCB_STATUS) == 0)
763 if (--boguscnt == 0) {
764 printk("%s: i82586 initialization timed out with status %04x,"
765 "cmd %04x.\n", dev->name,
766 readw(shmem+iSCB_STATUS), readw(shmem+iSCB_CMD));
769 /* Issue channel-attn -- the 82586 won't start. */
770 outb(0, ioaddr + SIGNAL_CA);
773 /* Disable loopback and enable interrupts. */
774 outb(0x84, ioaddr + MISC_CTRL);
776 printk("%s: Initialized 82586, status %04x.\n", dev->name,
777 readw(shmem+iSCB_STATUS));
781 static void hardware_send_packet(struct net_device *dev, void *buf, short length, short pad)
783 struct net_local *lp = netdev_priv(dev);
784 short ioaddr = dev->base_addr;
785 ushort tx_block = lp->tx_head;
786 void __iomem *write_ptr = lp->base + tx_block;
787 static char padding[ETH_ZLEN];
789 /* Set the write pointer to the Tx block, and put out the header. */
790 writew(0x0000,write_ptr); /* Tx status */
791 writew(CMD_INTR|CmdTx,write_ptr+=2); /* Tx command */
792 writew(tx_block+16,write_ptr+=2); /* Next command is a NoOp. */
793 writew(tx_block+8,write_ptr+=2); /* Data Buffer offset. */
795 /* Output the data buffer descriptor. */
796 writew((pad + length) | 0x8000,write_ptr+=2); /* Byte count parameter. */
797 writew(-1,write_ptr+=2); /* No next data buffer. */
798 writew(tx_block+22+SCB_BASE,write_ptr+=2); /* Buffer follows the NoOp command. */
799 writew(0x0000,write_ptr+=2); /* Buffer address high bits (always zero). */
801 /* Output the Loop-back NoOp command. */
802 writew(0x0000,write_ptr+=2); /* Tx status */
803 writew(CmdNOp,write_ptr+=2); /* Tx command */
804 writew(tx_block+16,write_ptr+=2); /* Next is myself. */
806 /* Output the packet at the write pointer. */
807 memcpy_toio(write_ptr+2, buf, length);
809 memcpy_toio(write_ptr+length+2, padding, pad);
811 /* Set the old command link pointing to this send packet. */
812 writew(tx_block,lp->base + lp->tx_cmd_link);
813 lp->tx_cmd_link = tx_block + 20;
815 /* Set the next free tx region. */
816 lp->tx_head = tx_block + TX_BUF_SIZE;
817 if (lp->tx_head > RX_BUF_START - TX_BUF_SIZE)
818 lp->tx_head = TX_BUF_START;
821 printk("%s: 3c507 @%x send length = %d, tx_block %3x, next %3x.\n",
822 dev->name, ioaddr, length, tx_block, lp->tx_head);
825 /* Grimly block further packets if there has been insufficient reaping. */
826 if (++lp->tx_pkts_in_ring < NUM_TX_BUFS)
827 netif_wake_queue(dev);
830 static void el16_rx(struct net_device *dev)
832 struct net_local *lp = netdev_priv(dev);
833 void __iomem *shmem = lp->base;
834 ushort rx_head = lp->rx_head;
835 ushort rx_tail = lp->rx_tail;
836 ushort boguscount = 10;
839 while ((frame_status = readw(shmem+rx_head)) < 0) { /* Command complete */
840 void __iomem *read_frame = lp->base + rx_head;
841 ushort rfd_cmd = readw(read_frame+2);
842 ushort next_rx_frame = readw(read_frame+4);
843 ushort data_buffer_addr = readw(read_frame+6);
844 void __iomem *data_frame = lp->base + data_buffer_addr;
845 ushort pkt_len = readw(data_frame);
847 if (rfd_cmd != 0 || data_buffer_addr != rx_head + 22
848 || (pkt_len & 0xC000) != 0xC000) {
849 printk("%s: Rx frame at %#x corrupted, status %04x cmd %04x"
850 "next %04x data-buf @%04x %04x.\n", dev->name, rx_head,
851 frame_status, rfd_cmd, next_rx_frame, data_buffer_addr,
853 } else if ((frame_status & 0x2000) == 0) {
854 /* Frame Rxed, but with error. */
855 lp->stats.rx_errors++;
856 if (frame_status & 0x0800) lp->stats.rx_crc_errors++;
857 if (frame_status & 0x0400) lp->stats.rx_frame_errors++;
858 if (frame_status & 0x0200) lp->stats.rx_fifo_errors++;
859 if (frame_status & 0x0100) lp->stats.rx_over_errors++;
860 if (frame_status & 0x0080) lp->stats.rx_length_errors++;
862 /* Malloc up new buffer. */
866 skb = dev_alloc_skb(pkt_len+2);
868 printk("%s: Memory squeeze, dropping packet.\n", dev->name);
869 lp->stats.rx_dropped++;
875 /* 'skb->data' points to the start of sk_buff data area. */
876 memcpy_fromio(skb_put(skb,pkt_len), data_frame + 10, pkt_len);
878 skb->protocol=eth_type_trans(skb,dev);
880 dev->last_rx = jiffies;
881 lp->stats.rx_packets++;
882 lp->stats.rx_bytes += pkt_len;
885 /* Clear the status word and set End-of-List on the rx frame. */
886 writew(0,read_frame);
887 writew(0xC000,read_frame+2);
888 /* Clear the end-of-list on the prev. RFD. */
889 writew(0x0000,lp->base + rx_tail + 2);
892 rx_head = next_rx_frame;
893 if (--boguscount == 0)
897 lp->rx_head = rx_head;
898 lp->rx_tail = rx_tail;
901 static void netdev_get_drvinfo(struct net_device *dev,
902 struct ethtool_drvinfo *info)
904 strcpy(info->driver, DRV_NAME);
905 strcpy(info->version, DRV_VERSION);
906 sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
909 static u32 netdev_get_msglevel(struct net_device *dev)
914 static void netdev_set_msglevel(struct net_device *dev, u32 level)
919 static const struct ethtool_ops netdev_ethtool_ops = {
920 .get_drvinfo = netdev_get_drvinfo,
921 .get_msglevel = netdev_get_msglevel,
922 .set_msglevel = netdev_set_msglevel,
926 static struct net_device *dev_3c507;
927 module_param(io, int, 0);
928 module_param(irq, int, 0);
929 MODULE_PARM_DESC(io, "EtherLink16 I/O base address");
930 MODULE_PARM_DESC(irq, "(ignored)");
932 int __init init_module(void)
935 printk("3c507: You should not use auto-probing with insmod!\n");
936 dev_3c507 = el16_probe(-1);
937 return IS_ERR(dev_3c507) ? PTR_ERR(dev_3c507) : 0;
943 struct net_device *dev = dev_3c507;
944 unregister_netdev(dev);
945 free_irq(dev->irq, dev);
946 iounmap(((struct net_local *)netdev_priv(dev))->base);
947 release_region(dev->base_addr, EL16_IO_EXTENT);
951 MODULE_LICENSE("GPL");
956 * 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"
958 * kept-new-versions: 5