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. */
127 ushort tx_pkts_in_ring;
133 Details of the EtherLink16 Implementation
134 The 3c507 is a generic shared-memory i82586 implementation.
135 The host can map 16K, 32K, 48K, or 64K of the 64K memory into
136 0x0[CD][08]0000, or all 64K into 0xF[02468]0000.
139 /* Offsets from the base I/O address. */
140 #define SA_DATA 0 /* Station address data, or 3Com signature. */
141 #define MISC_CTRL 6 /* Switch the SA_DATA banks, and bus config bits. */
142 #define RESET_IRQ 10 /* Reset the latched IRQ line. */
143 #define SIGNAL_CA 11 /* Frob the 82586 Channel Attention line. */
144 #define ROM_CONFIG 13
145 #define MEM_CONFIG 14
146 #define IRQ_CONFIG 15
147 #define EL16_IO_EXTENT 16
149 /* The ID port is used at boot-time to locate the ethercard. */
150 #define ID_PORT 0x100
152 /* Offsets to registers in the mailbox (SCB). */
153 #define iSCB_STATUS 0x8
155 #define iSCB_CBL 0xC /* Command BLock offset. */
156 #define iSCB_RFA 0xE /* Rx Frame Area offset. */
158 /* Since the 3c507 maps the shared memory window so that the last byte is
159 at 82586 address FFFF, the first byte is at 82586 address 0, 16K, 32K, or
160 48K corresponding to window sizes of 64K, 48K, 32K and 16K respectively.
161 We can account for this be setting the 'SBC Base' entry in the ISCP table
162 below for all the 16 bit offset addresses, and also adding the 'SCB Base'
163 value to all 24 bit physical addresses (in the SCP table and the TX and RX
167 #define SCB_BASE ((unsigned)64*1024 - (dev->mem_end - dev->mem_start))
170 What follows in 'init_words[]' is the "program" that is downloaded to the
171 82586 memory. It's mostly tables and command blocks, and starts at the
172 reset address 0xfffff6. This is designed to be similar to the EtherExpress,
173 thus the unusual location of the SCB at 0x0008.
175 Even with the additional "don't care" values, doing it this way takes less
176 program space than initializing the individual tables, and I feel it's much
179 The databook is particularly useless for the first two structures, I had
180 to use the Crynwr driver as an example.
182 The memory setup is as follows:
185 #define CONFIG_CMD 0x0018
186 #define SET_SA_CMD 0x0024
187 #define SA_OFFSET 0x002A
188 #define IDLELOOP 0x30
190 #define TDR_TIME 0x3C
191 #define DUMP_CMD 0x40
192 #define DIAG_CMD 0x48
193 #define SET_MC_CMD 0x4E
194 #define DUMP_DATA 0x56 /* A 170 byte buffer for dump and Set-MC into. */
196 #define TX_BUF_START 0x0100
197 #define NUM_TX_BUFS 5
198 #define TX_BUF_SIZE (1518+14+20+16) /* packet+header+TBD */
200 #define RX_BUF_START 0x2000
201 #define RX_BUF_SIZE (1518+14+18) /* packet+header+RBD */
202 #define RX_BUF_END (dev->mem_end - dev->mem_start)
207 That's it: only 86 bytes to set up the beast, including every extra
208 command available. The 170 byte buffer at DUMP_DATA is shared between the
209 Dump command (called only by the diagnostic program) and the SetMulticastList
212 To complete the memory setup you only have to write the station address at
213 SA_OFFSET and create the Tx & Rx buffer lists.
215 The Tx command chain and buffer list is setup as follows:
216 A Tx command table, with the data buffer pointing to...
217 A Tx data buffer descriptor. The packet is in a single buffer, rather than
218 chaining together several smaller buffers.
219 A NoOp command, which initially points to itself,
222 A transmit is done by filling in the Tx command table and data buffer,
223 re-writing the NoOp command, and finally changing the offset of the last
224 command to point to the current Tx command. When the Tx command is finished,
225 it jumps to the NoOp, when it loops until the next Tx command changes the
226 "link offset" in the NoOp. This way the 82586 never has to go through the
227 slow restart sequence.
229 The Rx buffer list is set up in the obvious ring structure. We have enough
230 memory (and low enough interrupt latency) that we can avoid the complicated
231 Rx buffer linked lists by alway associating a full-size Rx data buffer with
234 I current use four transmit buffers starting at TX_BUF_START (0x0100), and
235 use the rest of memory, from RX_BUF_START to RX_BUF_END, for Rx buffers.
239 static unsigned short init_words[] = {
240 /* System Configuration Pointer (SCP). */
241 0x0000, /* Set bus size to 16 bits. */
242 0,0, /* pad words. */
243 0x0000,0x0000, /* ISCP phys addr, set in init_82586_mem(). */
245 /* Intermediate System Configuration Pointer (ISCP). */
246 0x0001, /* Status word that's cleared when init is done. */
247 0x0008,0,0, /* SCB offset, (skip, skip) */
249 /* System Control Block (SCB). */
250 0,0xf000|RX_START|CUC_START, /* SCB status and cmd. */
251 CONFIG_CMD, /* Command list pointer, points to Configure. */
252 RX_BUF_START, /* Rx block list. */
253 0,0,0,0, /* Error count: CRC, align, buffer, overrun. */
255 /* 0x0018: Configure command. Change to put MAC data with packet. */
256 0, CmdConfigure, /* Status, command. */
257 SET_SA_CMD, /* Next command is Set Station Addr. */
258 0x0804, /* "4" bytes of config data, 8 byte FIFO. */
259 0x2e40, /* Magic values, including MAC data location. */
260 0, /* Unused pad word. */
262 /* 0x0024: Setup station address command. */
264 SET_MC_CMD, /* Next command. */
265 0xaa00,0xb000,0x0bad, /* Station address (to be filled in) */
267 /* 0x0030: NOP, looping back to itself. Point to first Tx buffer to Tx. */
268 0, CmdNOp, IDLELOOP, 0 /* pad */,
270 /* 0x0038: A unused Time-Domain Reflectometer command. */
271 0, CmdTDR, IDLELOOP, 0,
273 /* 0x0040: An unused Dump State command. */
274 0, CmdDump, IDLELOOP, DUMP_DATA,
276 /* 0x0048: An unused Diagnose command. */
277 0, CmdDiagnose, IDLELOOP,
279 /* 0x004E: An empty set-multicast-list command. */
280 0, CmdMulticastList, IDLELOOP, 0,
283 /* Index to functions, as function prototypes. */
285 static int el16_probe1(struct net_device *dev, int ioaddr);
286 static int el16_open(struct net_device *dev);
287 static int el16_send_packet(struct sk_buff *skb, struct net_device *dev);
288 static irqreturn_t el16_interrupt(int irq, void *dev_id);
289 static void el16_rx(struct net_device *dev);
290 static int el16_close(struct net_device *dev);
291 static void el16_tx_timeout (struct net_device *dev);
293 static void hardware_send_packet(struct net_device *dev, void *buf, short length, short pad);
294 static void init_82586_mem(struct net_device *dev);
295 static const struct ethtool_ops netdev_ethtool_ops;
296 static void init_rx_bufs(struct net_device *);
298 static int io = 0x300;
300 static int mem_start;
303 /* Check for a network adaptor of this type, and return '0' iff one exists.
304 If dev->base_addr == 0, probe all likely locations.
305 If dev->base_addr == 1, always return failure.
306 If dev->base_addr == 2, (detachable devices only) allocate space for the
307 device and return success.
310 struct net_device * __init el16_probe(int unit)
312 struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
313 static unsigned ports[] = { 0x300, 0x320, 0x340, 0x280, 0};
318 return ERR_PTR(-ENODEV);
321 sprintf(dev->name, "eth%d", unit);
322 netdev_boot_setup_check(dev);
325 mem_start = dev->mem_start & 15;
328 if (io > 0x1ff) /* Check a single specified location. */
329 err = el16_probe1(dev, io);
331 err = -ENXIO; /* Don't probe at all. */
333 for (port = ports; *port; port++) {
334 err = el16_probe1(dev, *port);
342 err = register_netdev(dev);
347 free_irq(dev->irq, dev);
348 iounmap(((struct net_local *)netdev_priv(dev))->base);
349 release_region(dev->base_addr, EL16_IO_EXTENT);
355 static int __init el16_probe1(struct net_device *dev, int ioaddr)
357 static unsigned char init_ID_done, version_printed;
358 int i, irq, irqval, retval;
359 struct net_local *lp;
360 DECLARE_MAC_BUF(mac);
362 if (init_ID_done == 0) {
363 ushort lrs_state = 0xff;
364 /* Send the ID sequence to the ID_PORT to enable the board(s). */
366 for(i = 0; i < 255; i++) {
367 outb(lrs_state, ID_PORT);
369 if (lrs_state & 0x100)
376 if (!request_region(ioaddr, EL16_IO_EXTENT, DRV_NAME))
379 if ((inb(ioaddr) != '*') || (inb(ioaddr + 1) != '3') ||
380 (inb(ioaddr + 2) != 'C') || (inb(ioaddr + 3) != 'O')) {
385 if (net_debug && version_printed++ == 0)
388 printk("%s: 3c507 at %#x,", dev->name, ioaddr);
390 /* We should make a few more checks here, like the first three octets of
391 the S.A. for the manufacturer's code. */
393 irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
395 irqval = request_irq(irq, &el16_interrupt, 0, DRV_NAME, dev);
397 printk(KERN_ERR "3c507: unable to get IRQ %d (irqval=%d).\n", irq, irqval);
402 /* We've committed to using the board, and can start filling in *dev. */
403 dev->base_addr = ioaddr;
405 outb(0x01, ioaddr + MISC_CTRL);
406 for (i = 0; i < 6; i++)
407 dev->dev_addr[i] = inb(ioaddr + i);
408 printk(" %s", print_mac(mac, dev->dev_addr));
411 net_debug = mem_start & 7;
414 dev->mem_start = MEM_BASE;
415 dev->mem_end = dev->mem_start + 0x10000;
420 char mem_config = inb(ioaddr + MEM_CONFIG);
421 if (mem_config & 0x20) {
423 base = 0xf00000 + (mem_config & 0x08 ? 0x080000
424 : ((mem_config & 3) << 17));
426 size = ((mem_config & 3) + 1) << 14;
427 base = 0x0c0000 + ( (mem_config & 0x18) << 12);
429 dev->mem_start = base;
430 dev->mem_end = base + size;
434 dev->if_port = (inb(ioaddr + ROM_CONFIG) & 0x80) ? 1 : 0;
435 dev->irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
437 printk(", IRQ %d, %sternal xcvr, memory %#lx-%#lx.\n", dev->irq,
438 dev->if_port ? "ex" : "in", dev->mem_start, dev->mem_end-1);
443 lp = netdev_priv(dev);
444 memset(lp, 0, sizeof(*lp));
445 spin_lock_init(&lp->lock);
446 lp->base = ioremap(dev->mem_start, RX_BUF_END);
448 printk(KERN_ERR "3c507: unable to remap memory\n");
453 dev->open = el16_open;
454 dev->stop = el16_close;
455 dev->hard_start_xmit = el16_send_packet;
456 dev->tx_timeout = el16_tx_timeout;
457 dev->watchdog_timeo = TX_TIMEOUT;
458 dev->ethtool_ops = &netdev_ethtool_ops;
459 dev->flags &= ~IFF_MULTICAST; /* Multicast doesn't work */
462 free_irq(dev->irq, dev);
464 release_region(ioaddr, EL16_IO_EXTENT);
468 static int el16_open(struct net_device *dev)
470 /* Initialize the 82586 memory and start it. */
473 netif_start_queue(dev);
478 static void el16_tx_timeout (struct net_device *dev)
480 struct net_local *lp = netdev_priv(dev);
481 int ioaddr = dev->base_addr;
482 void __iomem *shmem = lp->base;
485 printk ("%s: transmit timed out, %s? ", dev->name,
486 readw(shmem + iSCB_STATUS) & 0x8000 ? "IRQ conflict" :
487 "network cable problem");
488 /* Try to restart the adaptor. */
489 if (lp->last_restart == dev->stats.tx_packets) {
491 printk ("Resetting board.\n");
492 /* Completely reset the adaptor. */
493 init_82586_mem (dev);
494 lp->tx_pkts_in_ring = 0;
496 /* Issue the channel attention signal and hope it "gets better". */
498 printk ("Kicking board.\n");
499 writew(0xf000 | CUC_START | RX_START, shmem + iSCB_CMD);
500 outb (0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
501 lp->last_restart = dev->stats.tx_packets;
503 dev->trans_start = jiffies;
504 netif_wake_queue (dev);
508 static int el16_send_packet (struct sk_buff *skb, struct net_device *dev)
510 struct net_local *lp = netdev_priv(dev);
511 int ioaddr = dev->base_addr;
513 short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
514 unsigned char *buf = skb->data;
516 netif_stop_queue (dev);
518 spin_lock_irqsave (&lp->lock, flags);
520 dev->stats.tx_bytes += length;
521 /* Disable the 82586's input to the interrupt line. */
522 outb (0x80, ioaddr + MISC_CTRL);
524 hardware_send_packet (dev, buf, skb->len, length - skb->len);
526 dev->trans_start = jiffies;
527 /* Enable the 82586 interrupt input. */
528 outb (0x84, ioaddr + MISC_CTRL);
530 spin_unlock_irqrestore (&lp->lock, flags);
534 /* You might need to clean up and record Tx statistics here. */
539 /* The typical workload of the driver:
540 Handle the network interface interrupts. */
541 static irqreturn_t el16_interrupt(int irq, void *dev_id)
543 struct net_device *dev = dev_id;
544 struct net_local *lp;
545 int ioaddr, status, boguscount = 0;
550 printk ("net_interrupt(): irq %d for unknown device.\n", irq);
554 ioaddr = dev->base_addr;
555 lp = netdev_priv(dev);
558 spin_lock(&lp->lock);
560 status = readw(shmem+iSCB_STATUS);
563 printk("%s: 3c507 interrupt, status %4.4x.\n", dev->name, status);
566 /* Disable the 82586's input to the interrupt line. */
567 outb(0x80, ioaddr + MISC_CTRL);
569 /* Reap the Tx packet buffers. */
570 while (lp->tx_pkts_in_ring) {
571 unsigned short tx_status = readw(shmem+lp->tx_reap);
572 if (!(tx_status & 0x8000)) {
574 printk("Tx command incomplete (%#x).\n", lp->tx_reap);
577 /* Tx unsuccessful or some interesting status bit set. */
578 if (!(tx_status & 0x2000) || (tx_status & 0x0f3f)) {
579 dev->stats.tx_errors++;
580 if (tx_status & 0x0600) dev->stats.tx_carrier_errors++;
581 if (tx_status & 0x0100) dev->stats.tx_fifo_errors++;
582 if (!(tx_status & 0x0040)) dev->stats.tx_heartbeat_errors++;
583 if (tx_status & 0x0020) dev->stats.tx_aborted_errors++;
584 dev->stats.collisions += tx_status & 0xf;
586 dev->stats.tx_packets++;
588 printk("Reaped %x, Tx status %04x.\n" , lp->tx_reap, tx_status);
589 lp->tx_reap += TX_BUF_SIZE;
590 if (lp->tx_reap > RX_BUF_START - TX_BUF_SIZE)
591 lp->tx_reap = TX_BUF_START;
593 lp->tx_pkts_in_ring--;
594 /* There is always more space in the Tx ring buffer now. */
595 netif_wake_queue(dev);
597 if (++boguscount > 10)
601 if (status & 0x4000) { /* Packet received. */
603 printk("Received packet, rx_head %04x.\n", lp->rx_head);
607 /* Acknowledge the interrupt sources. */
608 ack_cmd = status & 0xf000;
610 if ((status & 0x0700) != 0x0200 && netif_running(dev)) {
612 printk("%s: Command unit stopped, status %04x, restarting.\n",
614 /* If this ever occurs we should really re-write the idle loop, reset
615 the Tx list, and do a complete restart of the command unit.
616 For now we rely on the Tx timeout if the resume doesn't work. */
617 ack_cmd |= CUC_RESUME;
620 if ((status & 0x0070) != 0x0040 && netif_running(dev)) {
621 /* The Rx unit is not ready, it must be hung. Restart the receiver by
622 initializing the rx buffers, and issuing an Rx start command. */
624 printk("%s: Rx unit stopped, status %04x, restarting.\n",
627 writew(RX_BUF_START,shmem+iSCB_RFA);
631 writew(ack_cmd,shmem+iSCB_CMD);
632 outb(0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
634 /* Clear the latched interrupt. */
635 outb(0, ioaddr + RESET_IRQ);
637 /* Enable the 82586's interrupt input. */
638 outb(0x84, ioaddr + MISC_CTRL);
639 spin_unlock(&lp->lock);
643 static int el16_close(struct net_device *dev)
645 struct net_local *lp = netdev_priv(dev);
646 int ioaddr = dev->base_addr;
647 void __iomem *shmem = lp->base;
649 netif_stop_queue(dev);
651 /* Flush the Tx and disable Rx. */
652 writew(RX_SUSPEND | CUC_SUSPEND,shmem+iSCB_CMD);
653 outb(0, ioaddr + SIGNAL_CA);
655 /* Disable the 82586's input to the interrupt line. */
656 outb(0x80, ioaddr + MISC_CTRL);
658 /* We always physically use the IRQ line, so we don't do free_irq(). */
660 /* Update the statistics here. */
665 /* Initialize the Rx-block list. */
666 static void init_rx_bufs(struct net_device *dev)
668 struct net_local *lp = netdev_priv(dev);
669 void __iomem *write_ptr;
670 unsigned short SCB_base = SCB_BASE;
672 int cur_rxbuf = lp->rx_head = RX_BUF_START;
674 /* Initialize each Rx frame + data buffer. */
675 do { /* While there is room for one more. */
677 write_ptr = lp->base + cur_rxbuf;
679 writew(0x0000,write_ptr); /* Status */
680 writew(0x0000,write_ptr+=2); /* Command */
681 writew(cur_rxbuf + RX_BUF_SIZE,write_ptr+=2); /* Link */
682 writew(cur_rxbuf + 22,write_ptr+=2); /* Buffer offset */
683 writew(0x0000,write_ptr+=2); /* Pad for dest addr. */
684 writew(0x0000,write_ptr+=2);
685 writew(0x0000,write_ptr+=2);
686 writew(0x0000,write_ptr+=2); /* Pad for source addr. */
687 writew(0x0000,write_ptr+=2);
688 writew(0x0000,write_ptr+=2);
689 writew(0x0000,write_ptr+=2); /* Pad for protocol. */
691 writew(0x0000,write_ptr+=2); /* Buffer: Actual count */
692 writew(-1,write_ptr+=2); /* Buffer: Next (none). */
693 writew(cur_rxbuf + 0x20 + SCB_base,write_ptr+=2);/* Buffer: Address low */
694 writew(0x0000,write_ptr+=2);
695 /* Finally, the number of bytes in the buffer. */
696 writew(0x8000 + RX_BUF_SIZE-0x20,write_ptr+=2);
698 lp->rx_tail = cur_rxbuf;
699 cur_rxbuf += RX_BUF_SIZE;
700 } while (cur_rxbuf <= RX_BUF_END - RX_BUF_SIZE);
702 /* Terminate the list by setting the EOL bit, and wrap the pointer to make
704 write_ptr = lp->base + lp->rx_tail + 2;
705 writew(0xC000,write_ptr); /* Command, mark as last. */
706 writew(lp->rx_head,write_ptr+2); /* Link */
709 static void init_82586_mem(struct net_device *dev)
711 struct net_local *lp = netdev_priv(dev);
712 short ioaddr = dev->base_addr;
713 void __iomem *shmem = lp->base;
715 /* Enable loopback to protect the wire while starting up,
716 and hold the 586 in reset during the memory initialization. */
717 outb(0x20, ioaddr + MISC_CTRL);
719 /* Fix the ISCP address and base. */
720 init_words[3] = SCB_BASE;
721 init_words[7] = SCB_BASE;
723 /* Write the words at 0xfff6 (address-aliased to 0xfffff6). */
724 memcpy_toio(lp->base + RX_BUF_END - 10, init_words, 10);
726 /* Write the words at 0x0000. */
727 memcpy_toio(lp->base, init_words + 5, sizeof(init_words) - 10);
729 /* Fill in the station address. */
730 memcpy_toio(lp->base+SA_OFFSET, dev->dev_addr,
731 sizeof(dev->dev_addr));
733 /* The Tx-block list is written as needed. We just set up the values. */
734 lp->tx_cmd_link = IDLELOOP + 4;
735 lp->tx_head = lp->tx_reap = TX_BUF_START;
739 /* Start the 586 by releasing the reset line, but leave loopback. */
740 outb(0xA0, ioaddr + MISC_CTRL);
742 /* This was time consuming to track down: you need to give two channel
743 attention signals to reliably start up the i82586. */
744 outb(0, ioaddr + SIGNAL_CA);
748 while (readw(shmem+iSCB_STATUS) == 0)
749 if (--boguscnt == 0) {
750 printk("%s: i82586 initialization timed out with status %04x, "
751 "cmd %04x.\n", dev->name,
752 readw(shmem+iSCB_STATUS), readw(shmem+iSCB_CMD));
755 /* Issue channel-attn -- the 82586 won't start. */
756 outb(0, ioaddr + SIGNAL_CA);
759 /* Disable loopback and enable interrupts. */
760 outb(0x84, ioaddr + MISC_CTRL);
762 printk("%s: Initialized 82586, status %04x.\n", dev->name,
763 readw(shmem+iSCB_STATUS));
767 static void hardware_send_packet(struct net_device *dev, void *buf, short length, short pad)
769 struct net_local *lp = netdev_priv(dev);
770 short ioaddr = dev->base_addr;
771 ushort tx_block = lp->tx_head;
772 void __iomem *write_ptr = lp->base + tx_block;
773 static char padding[ETH_ZLEN];
775 /* Set the write pointer to the Tx block, and put out the header. */
776 writew(0x0000,write_ptr); /* Tx status */
777 writew(CMD_INTR|CmdTx,write_ptr+=2); /* Tx command */
778 writew(tx_block+16,write_ptr+=2); /* Next command is a NoOp. */
779 writew(tx_block+8,write_ptr+=2); /* Data Buffer offset. */
781 /* Output the data buffer descriptor. */
782 writew((pad + length) | 0x8000,write_ptr+=2); /* Byte count parameter. */
783 writew(-1,write_ptr+=2); /* No next data buffer. */
784 writew(tx_block+22+SCB_BASE,write_ptr+=2); /* Buffer follows the NoOp command. */
785 writew(0x0000,write_ptr+=2); /* Buffer address high bits (always zero). */
787 /* Output the Loop-back NoOp command. */
788 writew(0x0000,write_ptr+=2); /* Tx status */
789 writew(CmdNOp,write_ptr+=2); /* Tx command */
790 writew(tx_block+16,write_ptr+=2); /* Next is myself. */
792 /* Output the packet at the write pointer. */
793 memcpy_toio(write_ptr+2, buf, length);
795 memcpy_toio(write_ptr+length+2, padding, pad);
797 /* Set the old command link pointing to this send packet. */
798 writew(tx_block,lp->base + lp->tx_cmd_link);
799 lp->tx_cmd_link = tx_block + 20;
801 /* Set the next free tx region. */
802 lp->tx_head = tx_block + TX_BUF_SIZE;
803 if (lp->tx_head > RX_BUF_START - TX_BUF_SIZE)
804 lp->tx_head = TX_BUF_START;
807 printk("%s: 3c507 @%x send length = %d, tx_block %3x, next %3x.\n",
808 dev->name, ioaddr, length, tx_block, lp->tx_head);
811 /* Grimly block further packets if there has been insufficient reaping. */
812 if (++lp->tx_pkts_in_ring < NUM_TX_BUFS)
813 netif_wake_queue(dev);
816 static void el16_rx(struct net_device *dev)
818 struct net_local *lp = netdev_priv(dev);
819 void __iomem *shmem = lp->base;
820 ushort rx_head = lp->rx_head;
821 ushort rx_tail = lp->rx_tail;
822 ushort boguscount = 10;
825 while ((frame_status = readw(shmem+rx_head)) < 0) { /* Command complete */
826 void __iomem *read_frame = lp->base + rx_head;
827 ushort rfd_cmd = readw(read_frame+2);
828 ushort next_rx_frame = readw(read_frame+4);
829 ushort data_buffer_addr = readw(read_frame+6);
830 void __iomem *data_frame = lp->base + data_buffer_addr;
831 ushort pkt_len = readw(data_frame);
833 if (rfd_cmd != 0 || data_buffer_addr != rx_head + 22
834 || (pkt_len & 0xC000) != 0xC000) {
835 printk(KERN_ERR "%s: Rx frame at %#x corrupted, "
836 "status %04x cmd %04x next %04x "
837 "data-buf @%04x %04x.\n",
838 dev->name, rx_head, frame_status, rfd_cmd,
839 next_rx_frame, data_buffer_addr, pkt_len);
840 } else if ((frame_status & 0x2000) == 0) {
841 /* Frame Rxed, but with error. */
842 dev->stats.rx_errors++;
843 if (frame_status & 0x0800) dev->stats.rx_crc_errors++;
844 if (frame_status & 0x0400) dev->stats.rx_frame_errors++;
845 if (frame_status & 0x0200) dev->stats.rx_fifo_errors++;
846 if (frame_status & 0x0100) dev->stats.rx_over_errors++;
847 if (frame_status & 0x0080) dev->stats.rx_length_errors++;
849 /* Malloc up new buffer. */
853 skb = dev_alloc_skb(pkt_len+2);
855 printk(KERN_ERR "%s: Memory squeeze, "
856 "dropping packet.\n",
858 dev->stats.rx_dropped++;
864 /* 'skb->data' points to the start of sk_buff data area. */
865 memcpy_fromio(skb_put(skb,pkt_len), data_frame + 10, pkt_len);
867 skb->protocol=eth_type_trans(skb,dev);
869 dev->last_rx = jiffies;
870 dev->stats.rx_packets++;
871 dev->stats.rx_bytes += pkt_len;
874 /* Clear the status word and set End-of-List on the rx frame. */
875 writew(0,read_frame);
876 writew(0xC000,read_frame+2);
877 /* Clear the end-of-list on the prev. RFD. */
878 writew(0x0000,lp->base + rx_tail + 2);
881 rx_head = next_rx_frame;
882 if (--boguscount == 0)
886 lp->rx_head = rx_head;
887 lp->rx_tail = rx_tail;
890 static void netdev_get_drvinfo(struct net_device *dev,
891 struct ethtool_drvinfo *info)
893 strcpy(info->driver, DRV_NAME);
894 strcpy(info->version, DRV_VERSION);
895 sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
898 static u32 netdev_get_msglevel(struct net_device *dev)
903 static void netdev_set_msglevel(struct net_device *dev, u32 level)
908 static const struct ethtool_ops netdev_ethtool_ops = {
909 .get_drvinfo = netdev_get_drvinfo,
910 .get_msglevel = netdev_get_msglevel,
911 .set_msglevel = netdev_set_msglevel,
915 static struct net_device *dev_3c507;
916 module_param(io, int, 0);
917 module_param(irq, int, 0);
918 MODULE_PARM_DESC(io, "EtherLink16 I/O base address");
919 MODULE_PARM_DESC(irq, "(ignored)");
921 int __init init_module(void)
924 printk("3c507: You should not use auto-probing with insmod!\n");
925 dev_3c507 = el16_probe(-1);
926 return IS_ERR(dev_3c507) ? PTR_ERR(dev_3c507) : 0;
932 struct net_device *dev = dev_3c507;
933 unregister_netdev(dev);
934 free_irq(dev->irq, dev);
935 iounmap(((struct net_local *)netdev_priv(dev))->base);
936 release_region(dev->base_addr, EL16_IO_EXTENT);
940 MODULE_LICENSE("GPL");
945 * 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"
947 * kept-new-versions: 5