3c505.c

GNU Mach 微内核源代码, 基于美国卡内基美隆大学的 Mach 研究项目

		adapter->tx_pcb.length = 6 * dev->mc_count;
		for (i = 0; i < dev->mc_count; i++) {
			memcpy(adapter->tx_pcb.data.multicast[i], dmi->dmi_addr, 6);
			dmi = dmi->next;
		}
		adapter->got[CMD_LOAD_MULTICAST_LIST] = 0;
		if (!send_pcb(dev, &adapter->tx_pcb))
			printk("%s: couldn't send set_multicast command\n", dev->name);
		else {
			int timeout = jiffies + TIMEOUT;
			while (adapter->got[CMD_LOAD_MULTICAST_LIST] == 0 && jiffies < timeout);
			if (jiffies >= timeout) {
				TIMEOUT_MSG(__LINE__);
			}
		}
		if (dev->mc_count)
			adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD | RECV_MULTI;
		else		/* num_addrs == 0 */
			adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
	} else
		adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_PROMISC;
	/*
	 * configure adapter to receive messages (as specified above)
	 * and wait for response
	 */
	if (elp_debug >= 3)
		printk("%s: sending 82586 configure command\n", dev->name);
	adapter->tx_pcb.command = CMD_CONFIGURE_82586;
	adapter->tx_pcb.length = 2;
	adapter->got[CMD_CONFIGURE_82586] = 0;
	if (!send_pcb(dev, &adapter->tx_pcb))
		printk("%s: couldn't send 82586 configure command\n", dev->name);
	else {
		int timeout = jiffies + TIMEOUT;
		while (adapter->got[CMD_CONFIGURE_82586] == 0 && jiffies < timeout);
		if (jiffies >= timeout)
			TIMEOUT_MSG(__LINE__);
	}
}

/******************************************************
 *
 * initialise Etherlink Plus board
 *
 ******************************************************/

static void elp_init(struct device *dev)
{
	elp_device *adapter = dev->priv;

	/*
	 * set ptrs to various functions
	 */
	dev->open = elp_open;	/* local */
	dev->stop = elp_close;	/* local */
	dev->get_stats = elp_get_stats;		/* local */
	dev->hard_start_xmit = elp_start_xmit;	/* local */
	dev->set_multicast_list = elp_set_mc_list;	/* local */

	/* Setup the generic properties */
	ether_setup(dev);

	/*
	 * setup ptr to adapter specific information
	 */
	memset(&(adapter->stats), 0, sizeof(struct enet_statistics));

	/*
	 * memory information
	 */
	dev->mem_start = dev->mem_end = dev->rmem_end = dev->rmem_start = 0;
}

/************************************************************
 *
 * A couple of tests to see if there's 3C505 or not
 * Called only by elp_autodetect
 ************************************************************/

static int elp_sense(struct device *dev)
{
	int timeout;
	int addr = dev->base_addr;
	const char *name = dev->name;
	long flags;
	byte orig_HCR, orig_HSR;

	if (check_region(addr, 0xf))
		return -1;

	orig_HCR = inb_control(addr);
	orig_HSR = inb_status(addr);

	if (elp_debug > 0)
		printk(search_msg, name, addr);

	if (((orig_HCR == 0xff) && (orig_HSR == 0xff)) ||
	    ((orig_HCR & DIR) != (orig_HSR & DIR))) {
		if (elp_debug > 0)
			printk(notfound_msg, 1);
		return -1;	/* It can't be 3c505 if HCR.DIR != HSR.DIR */
	}
	/* Enable interrupts - we need timers! */
	save_flags(flags);
	sti();

	/* Wait for a while; the adapter may still be booting up */
	if (elp_debug > 0)
		printk(stilllooking_msg);
	if (orig_HCR & DIR) {
		/* If HCR.DIR is up, we pull it down. HSR.DIR should follow. */
		outb_control(orig_HCR & ~DIR, addr);
		timeout = jiffies + 30;
		while (jiffies < timeout);
		restore_flags(flags);
		if (inb_status(addr) & DIR) {
			outb_control(orig_HCR, addr);
			if (elp_debug > 0)
				printk(notfound_msg, 2);
			return -1;
		}
	} else {
		/* If HCR.DIR is down, we pull it up. HSR.DIR should follow. */
		outb_control(orig_HCR | DIR, addr);
		timeout = jiffies + 30;
		while (jiffies < timeout);
		restore_flags(flags);
		if (!(inb_status(addr) & DIR)) {
			outb_control(orig_HCR, addr);
			if (elp_debug > 0)
				printk(notfound_msg, 3);
			return -1;
		}
	}
	/*
	 * It certainly looks like a 3c505. If it has DMA enabled, it needs
	 * a hard reset. Also, do a hard reset if selected at the compile time.
	 */
	if (elp_debug > 0)
		printk(found_msg);

	return 0;
}

/*************************************************************
 *
 * Search through addr_list[] and try to find a 3C505
 * Called only by eplus_probe
 *************************************************************/

static int elp_autodetect(struct device *dev)
{
	int idx = 0;

	/* if base address set, then only check that address
	   otherwise, run through the table */
	if (dev->base_addr != 0) {	/* dev->base_addr == 0 ==> plain autodetect */
		if (elp_sense(dev) == 0)
			return dev->base_addr;
	} else
		while ((dev->base_addr = addr_list[idx++])) {
			if (elp_sense(dev) == 0)
				return dev->base_addr;
		}

	/* could not find an adapter */
	if (elp_debug > 0)
		printk(couldnot_msg, dev->name);

	return 0;		/* Because of this, the layer above will return -ENODEV */
}


/******************************************************
 *
 * probe for an Etherlink Plus board at the specified address
 *
 ******************************************************/

/* There are three situations we need to be able to detect here:

 *  a) the card is idle
 *  b) the card is still booting up
 *  c) the card is stuck in a strange state (some DOS drivers do this)
 *
 * In case (a), all is well.  In case (b), we wait 10 seconds to see if the
 * card finishes booting, and carry on if so.  In case (c), we do a hard reset,
 * loop round, and hope for the best.
 *
 * This is all very unpleasant, but hopefully avoids the problems with the old
 * probe code (which had a 15-second delay if the card was idle, and didn't
 * work at all if it was in a weird state).
 */

int elplus_probe(struct device *dev)
{
	elp_device *adapter;
	int i, tries, tries1, timeout, okay;

	/*
	 *  setup adapter structure
	 */

	dev->base_addr = elp_autodetect(dev);
	if (!(dev->base_addr))
		return -ENODEV;

	/*
	 * setup ptr to adapter specific information
	 */
	adapter = (elp_device *) (dev->priv = kmalloc(sizeof(elp_device), GFP_KERNEL));
	if (adapter == NULL) {
		printk("%s: out of memory\n", dev->name);
		return -ENODEV;
        }

	for (tries1 = 0; tries1 < 3; tries1++) {
		outb_control((inb_control(dev->base_addr) | CMDE) & ~DIR, dev->base_addr);
		/* First try to write just one byte, to see if the card is
		 * responding at all normally.
		 */
		timeout = jiffies + 5;
		okay = 0;
		while (jiffies < timeout && !(inb_status(dev->base_addr) & HCRE));
		if ((inb_status(dev->base_addr) & HCRE)) {
			outb_command(0, dev->base_addr);	/* send a spurious byte */
			timeout = jiffies + 5;
			while (jiffies < timeout && !(inb_status(dev->base_addr) & HCRE));
			if (inb_status(dev->base_addr) & HCRE)
				okay = 1;
		}
		if (!okay) {
			/* Nope, it's ignoring the command register.  This means that
			 * either it's still booting up, or it's died.
			 */
			printk("%s: command register wouldn't drain, ", dev->name);
			if ((inb_status(dev->base_addr) & 7) == 3) {
				/* If the adapter status is 3, it *could* still be booting.
				 * Give it the benefit of the doubt for 10 seconds.
				 */
				printk("assuming 3c505 still starting\n");
				timeout = jiffies + 10 * HZ;
				while (jiffies < timeout && (inb_status(dev->base_addr) & 7));
				if (inb_status(dev->base_addr) & 7) {
					printk("%s: 3c505 failed to start\n", dev->name);
				} else {
					okay = 1;  /* It started */
				}
			} else {
				/* Otherwise, it must just be in a strange state.  We probably
				 * need to kick it.
				 */
				printk("3c505 is sulking\n");
			}
		}
		for (tries = 0; tries < 5 && okay; tries++) {

			/*
			 * Try to set the Ethernet address, to make sure that the board
			 * is working.
			 */
			adapter->tx_pcb.command = CMD_STATION_ADDRESS;
			adapter->tx_pcb.length = 0;
			autoirq_setup(0);
			if (!send_pcb(dev, &adapter->tx_pcb)) {
				printk("%s: could not send first PCB\n", dev->name);
				autoirq_report(0);
				continue;
			}
			if (!receive_pcb(dev, &adapter->rx_pcb)) {
				printk("%s: could not read first PCB\n", dev->name);
				autoirq_report(0);
				continue;
			}
			if ((adapter->rx_pcb.command != CMD_ADDRESS_RESPONSE) ||
			    (adapter->rx_pcb.length != 6)) {
				printk("%s: first PCB wrong (%d, %d)\n", dev->name, adapter->rx_pcb.command, adapter->rx_pcb.length);
				autoirq_report(0);
				continue;
			}
			goto okay;
		}
		/* It's broken.  Do a hard reset to re-initialise the board,
		 * and try again.
		 */
		printk(KERN_INFO "%s: resetting adapter\n", dev->name);
		outb_control(inb_control(dev->base_addr) | FLSH | ATTN, dev->base_addr);
		outb_control(inb_control(dev->base_addr) & ~(FLSH | ATTN), dev->base_addr);
	}
	printk("%s: failed to initialise 3c505\n", dev->name);
	return -ENODEV;

      okay:
	if (dev->irq) {		/* Is there a preset IRQ? */
		int rpt = autoirq_report(0);
		if (dev->irq != rpt) {
			printk("%s: warning, irq %d configured but %d detected\n", dev->name, dev->irq, rpt);
			return -ENODEV;
		}
		/* if dev->irq == autoirq_report(0), all is well */
	} else			/* No preset IRQ; just use what we can detect */
		dev->irq = autoirq_report(0);
	switch (dev->irq) {	/* Legal, sane? */
	case 0:
		printk("%s: No IRQ reported by autoirq_report().\n", dev->name);
		printk("%s: Check the jumpers of your 3c505 board.\n", dev->name);
		return -ENODEV;
	case 1:
	case 6:
	case 8:
	case 13:
		printk("%s: Impossible IRQ %d reported by autoirq_report().\n",
		       dev->name, dev->irq);
		return -ENODEV;
	}
	/*
	 *  Now we have the IRQ number so we can disable the interrupts from
	 *  the board until the board is opened.
	 */
	outb_control(inb_control(dev->base_addr) & ~CMDE, dev->base_addr);

	/*
	 * copy ethernet address into structure
	 */
	for (i = 0; i < 6; i++)
		dev->dev_addr[i] = adapter->rx_pcb.data.eth_addr[i];

	/* set up the DMA channel */
	dev->dma = ELP_DMA;

	/*
	 * print remainder of startup message
	 */
	printk("%s: 3c505 at %#lx, irq %d, dma %d, ",
	       dev->name, dev->base_addr, dev->irq, dev->dma);
	printk("addr %02x:%02x:%02x:%02x:%02x:%02x, ",
	       dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
	       dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);

	/*
	 * read more information from the adapter
	 */

	adapter->tx_pcb.command = CMD_ADAPTER_INFO;
	adapter->tx_pcb.length = 0;
	if (!send_pcb(dev, &adapter->tx_pcb) ||
	    !receive_pcb(dev, &adapter->rx_pcb) ||
	    (adapter->rx_pcb.command != CMD_ADAPTER_INFO_RESPONSE) ||
	    (adapter->rx_pcb.length != 10)) {
		printk("%s: not responding to second PCB\n", dev->name);
	}
	printk("rev %d.%d, %dk\n", adapter->rx_pcb.data.info.major_vers, adapter->rx_pcb.data.info.minor_vers, adapter->rx_pcb.data.info.RAM_sz);

	/*
	 * reconfigure the adapter memory to better suit our purposes
	 */
	adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
	adapter->tx_pcb.length = 12;
	adapter->tx_pcb.data.memconf.cmd_q = 8;
	adapter->tx_pcb.data.memconf.rcv_q = 8;
	adapter->tx_pcb.data.memconf.mcast = 10;
	adapter->tx_pcb.data.memconf.frame = 10;
	adapter->tx_pcb.data.memconf.rcv_b = 10;
	adapter->tx_pcb.data.memconf.progs = 0;
	if (!send_pcb(dev, &adapter->tx_pcb) ||
	    !receive_pcb(dev, &adapter->rx_pcb) ||
	    (adapter->rx_pcb.command != CMD_CONFIGURE_ADAPTER_RESPONSE) ||
	    (adapter->rx_pcb.length != 2)) {
		printk("%s: could not configure adapter memory\n", dev->name);
	}
	if (adapter->rx_pcb.data.configure) {
		printk("%s: adapter configuration failed\n", dev->name);
	}
	/*
	 * and reserve the address region
	 */
	request_region(dev->base_addr, ELP_IO_EXTENT, "3c505");

	/*
	 * initialise the device
	 */
	elp_init(dev);

	return 0;
}

#ifdef MODULE
static char devicename[9] = {0,};
static struct device dev_3c505 =
{
	devicename,		/* device name is inserted by linux/drivers/net/net_init.c */
	0, 0, 0, 0,
	0, 0,
	0, 0, 0, NULL, elplus_probe};

int io = 0x300;
int irq = 0;

int init_module(void)
{
	if (io == 0)
		printk("3c505: You should not use auto-probing with insmod!\n");
	dev_3c505.base_addr = io;
	dev_3c505.irq = irq;
	if (register_netdev(&dev_3c505) != 0) {
		return -EIO;
	}
	return 0;
}

void cleanup_module(void)
{
	unregister_netdev(&dev_3c505);
	kfree(dev_3c505.priv);
	dev_3c505.priv = NULL;

	/* If we don't do this, we can't re-insmod it later. */
	release_region(dev_3c505.base_addr, ELP_IO_EXTENT);
}

#endif				/* MODULE */


/*
 * Local Variables:
 *  c-file-style: "linux"
 *  tab-width: 8
 *  compile-command: "gcc -D__KERNEL__ -I/discs/bibble/src/linux-1.3.69/include  -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strength-reduce -pipe -m486 -DCPU=486 -DMODULE  -c 3c505.c"
 * End:
 */