patch-2.3.36 linux/drivers/net/arcnet/com20020.c

• Lines: 353
• Date: Sun Jan 2 00:46:32 2000
• Orig file: v2.3.35/linux/drivers/net/arcnet/com20020.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.35/linux/drivers/net/arcnet/com20020.c linux/drivers/net/arcnet/com20020.c
@@ -0,0 +1,352 @@
+/*
+ * Linux ARCnet driver - COM20020 chipset support
+ * 
+ * Written 1997 by David Woodhouse.
+ * Written 1994-1999 by Avery Pennarun.
+ * Written 1999 by Martin Mares <mj@suse.cz>.
+ * Derived from skeleton.c by Donald Becker.
+ *
+ * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
+ *  for sponsoring the further development of this driver.
+ *
+ * **********************
+ *
+ * The original copyright of skeleton.c was as follows:
+ *
+ * skeleton.c Written 1993 by Donald Becker.
+ * Copyright 1993 United States Government as represented by the
+ * Director, National Security Agency.  This software may only be used
+ * and distributed according to the terms of the GNU Public License as
+ * modified by SRC, incorporated herein by reference.
+ *
+ * **********************
+ *
+ * For more details, see drivers/net/arcnet.c
+ *
+ * **********************
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+#include <linux/malloc.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/init.h>
+#include <linux/arcdevice.h>
+#include <linux/com20020.h>
+
+#include <asm/io.h>
+
+#define VERSION "arcnet: COM20020 chipset support (by David Woodhouse et al.)\n"
+
+static char *clockrates[] =
+{"2.5 Mb/s", "1.25Mb/s", "625 Kb/s", "312.5 Kb/s",
+ "156.25 Kb/s", "Reserved", "Reserved",
+ "Reserved"};
+
+static void com20020_command(struct net_device *dev, int command);
+static int com20020_status(struct net_device *dev);
+static void com20020_setmask(struct net_device *dev, int mask);
+static int com20020_reset(struct net_device *dev, int really_reset);
+static void com20020_openclose(struct net_device *dev, bool open);
+static void com20020_copy_to_card(struct net_device *dev, int bufnum,
+				  int offset, void *buf, int count);
+static void com20020_copy_from_card(struct net_device *dev, int bufnum,
+				    int offset, void *buf, int count);
+static void com20020_set_mc_list(struct net_device *dev);
+
+
+static void com20020_copy_from_card(struct net_device *dev, int bufnum,
+				    int offset, void *buf, int count)
+{
+	int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;
+
+	/* set up the address register */
+	outb((ofs >> 8) | RDDATAflag | AUTOINCflag, _ADDR_HI);
+	outb(ofs & 0xff, _ADDR_LO);
+
+	/* copy the data */
+	TIME("insb", count, insb(_MEMDATA, buf, count));
+}
+
+
+static void com20020_copy_to_card(struct net_device *dev, int bufnum,
+				  int offset, void *buf, int count)
+{
+	int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;
+
+	/* set up the address register */
+	outb((ofs >> 8) | AUTOINCflag, _ADDR_HI);
+	outb(ofs & 0xff, _ADDR_LO);
+
+	/* copy the data */
+	TIME("outsb", count, outsb(_MEMDATA, buf, count));
+}
+
+
+/* Reset the card and check some basic stuff during the detection stage. */
+int __init com20020_check(struct net_device *dev)
+{
+	int ioaddr = dev->base_addr, status;
+	struct arcnet_local *lp = dev->priv;
+
+	ARCRESET0;
+	mdelay(RESETtime);
+
+	lp->setup = lp->clock << 1;
+
+	REGSETUP;
+	SETCONF(lp->config);
+	outb(lp->setup, ioaddr + 7);
+
+	lp->config = 0x21 | (lp->timeout << 3) | (lp->backplane << 2);
+	/* set node ID to 0x42 (but transmitter is disabled, so it's okay) */
+	SETCONF(lp->config);
+	outb(0x42, ioaddr + 7);
+
+	status = ASTATUS();
+
+	if ((status & 0x99) != (NORXflag | TXFREEflag | RESETflag)) {
+		BUGMSG(D_NORMAL, "status invalid (%Xh).\n", status);
+		return -ENODEV;
+	}
+	BUGMSG(D_INIT_REASONS, "status after reset: %X\n", status);
+
+	/* Enable TX */
+	outb(0x39, _CONFIG);
+	outb(inb(ioaddr + 8), ioaddr + 7);
+
+	ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
+
+	status = ASTATUS();
+	BUGMSG(D_INIT_REASONS, "status after reset acknowledged: %X\n",
+	       status);
+
+	/* Read first location of memory */
+	outb(0 | RDDATAflag | AUTOINCflag, _ADDR_HI);
+	outb(0, _ADDR_LO);
+
+	if ((status = inb(_MEMDATA)) != TESTvalue) {
+		BUGMSG(D_NORMAL, "Signature byte not found (%02Xh != D1h).\n",
+		       status);
+		return -ENODEV;
+	}
+	return 0;
+}
+
+/* Set up the struct net_device associated with this card.  Called after
+ * probing succeeds.
+ */
+int __init com20020_found(struct net_device *dev, int shared)
+{
+	struct arcnet_local *lp;
+	int ioaddr = dev->base_addr;
+
+	/* Initialize the rest of the device structure. */
+
+	lp = (struct arcnet_local *) dev->priv;
+
+	lp->hw.command = com20020_command;
+	lp->hw.status = com20020_status;
+	lp->hw.intmask = com20020_setmask;
+	lp->hw.reset = com20020_reset;
+	lp->hw.open_close = com20020_openclose;
+	lp->hw.copy_to_card = com20020_copy_to_card;
+	lp->hw.copy_from_card = com20020_copy_from_card;
+
+	dev->set_multicast_list = com20020_set_mc_list;
+
+	/* Fill in the fields of the device structure with generic
+	 * values.
+	 */
+	arcdev_setup(dev);
+
+	if (!dev->dev_addr[0])
+		dev->dev_addr[0] = inb(ioaddr + 8);	/* FIXME: do this some other way! */
+
+	lp->setup = lp->clock << 1;
+
+	REGSETUP;
+	SETCONF(lp->config);
+	outb(lp->setup, ioaddr + 7);
+
+	lp->config = 0x20 | (lp->timeout << 3) | (lp->backplane << 2) | 1;
+	/* Default 0x38 + register: Node ID */
+	SETCONF(lp->config);
+	outb(dev->dev_addr[0], ioaddr + 7);
+
+	/* reserve the irq */
+	if (request_irq(dev->irq, &arcnet_interrupt, shared,
+			"arcnet (COM20020)", dev)) {
+		BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", dev->irq);
+		return -ENODEV;
+	}
+	/* reserve the I/O region - guaranteed to work by check_region */
+	request_region(ioaddr, ARCNET_TOTAL_SIZE, "arcnet (COM20020)");
+	dev->base_addr = ioaddr;
+
+	BUGMSG(D_NORMAL, "COM20020: station %02Xh found at %03lXh, IRQ %d.\n",
+	       dev->dev_addr[0], dev->base_addr, dev->irq);
+
+	if (lp->backplane)
+		BUGMSG(D_NORMAL, "Using backplane mode.\n");
+
+	if (lp->timeout != 3)
+		BUGMSG(D_NORMAL, "Using extended timeout value of %d.\n", lp->timeout);
+	if (lp->setup) {
+		BUGMSG(D_NORMAL, "Using CKP %d - data rate %s.\n",
+		       lp->setup >> 1, clockrates[lp->setup >> 1]);
+	}
+	if (!dev->init && register_netdev(dev)) {
+		free_irq(dev->irq, dev);
+		release_region(ioaddr, ARCNET_TOTAL_SIZE);
+		return -EIO;
+	}
+	return 0;
+}
+
+
+/* 
+ * Do a hardware reset on the card, and set up necessary registers.
+ * 
+ * This should be called as little as possible, because it disrupts the
+ * token on the network (causes a RECON) and requires a significant delay.
+ *
+ * However, it does make sure the card is in a defined state.
+ */
+static int com20020_reset(struct net_device *dev, int really_reset)
+{
+	struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
+	short ioaddr = dev->base_addr;
+	u_char inbyte;
+
+	BUGMSG(D_INIT, "Resetting %s (status=%02Xh)\n",
+	       dev->name, ASTATUS());
+
+	lp->config = TXENcfg | (lp->timeout << 3) | (lp->backplane << 2);
+	/* power-up defaults */
+	SETCONF(lp->config);
+
+	if (really_reset) {
+		/* reset the card */
+		ARCRESET;
+		mdelay(RESETtime * 2);	/* COM20020 seems to be slower sometimes */
+	}
+	/* clear flags & end reset */
+	ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
+
+	/* verify that the ARCnet signature byte is present */
+
+	com20020_copy_from_card(dev, 0, 0, &inbyte, 1);
+	if (inbyte != TESTvalue) {
+		BUGMSG(D_NORMAL, "reset failed: TESTvalue not present.\n");
+		return 1;
+	}
+	/* enable extended (512-byte) packets */
+	ACOMMAND(CONFIGcmd | EXTconf);
+
+	/* done!  return success. */
+	return 0;
+}
+
+
+static void com20020_setmask(struct net_device *dev, int mask)
+{
+	short ioaddr = dev->base_addr;
+	AINTMASK(mask);
+}
+
+
+static void com20020_command(struct net_device *dev, int cmd)
+{
+	short ioaddr = dev->base_addr;
+	ACOMMAND(cmd);
+}
+
+
+static int com20020_status(struct net_device *dev)
+{
+	short ioaddr = dev->base_addr;
+	return ASTATUS();
+}
+
+
+static void com20020_openclose(struct net_device *dev, bool open)
+{
+	struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
+	int ioaddr = dev->base_addr;
+
+	if (open)
+		MOD_INC_USE_COUNT;
+	else {
+		/* disable transmitter */
+		lp->config &= ~TXENcfg;
+		SETCONF(lp->config);
+		MOD_DEC_USE_COUNT;
+	}
+	lp->hw.open_close_ll(dev, open);
+}
+
+
+/* Set or clear the multicast filter for this adaptor.
+ * num_addrs == -1    Promiscuous mode, receive all packets
+ * num_addrs == 0       Normal mode, clear multicast list
+ * num_addrs > 0        Multicast mode, receive normal and MC packets, and do
+ *                      best-effort filtering.
+ *      FIXME - do multicast stuff, not just promiscuous.
+ */
+static void com20020_set_mc_list(struct net_device *dev)
+{
+	struct arcnet_local *lp = dev->priv;
+	int ioaddr = dev->base_addr;
+
+	if ((dev->flags & IFF_PROMISC) && (dev->flags & IFF_UP)) {	/* Enable promiscuous mode */
+		if (!(lp->setup & PROMISCset))
+			BUGMSG(D_NORMAL, "Setting promiscuous flag...\n");
+		REGSETUP;
+		SETCONF(lp->config);
+		lp->setup |= PROMISCset;
+		outb(lp->setup, _SETUP);
+	} else
+		/* Disable promiscuous mode, use normal mode */
+	{
+		if ((lp->setup & PROMISCset))
+			BUGMSG(D_NORMAL, "Resetting promiscuous flag...\n");
+		REGSETUP;
+		SETCONF(lp->config);
+		lp->setup &= ~PROMISCset;
+		outb(lp->setup, _SETUP);
+	}
+}
+
+
+/*
+ * FIXME: put this somewhere!
+ * 
+ if ((dstatus = inb(_DIAGSTAT)) & NEWNXTIDflag)
+ {
+ REGNXTID;
+ SETCONF(lp->config);
+ BUGMSG(D_EXTRA, "New NextID detected: %X\n", inb(ioaddr + 7));
+ }
+ */
+
+
+#ifdef MODULE
+
+EXPORT_SYMBOL(com20020_check);
+EXPORT_SYMBOL(com20020_found);
+
+int init_module(void)
+{
+	BUGLVL(D_NORMAL) printk(VERSION);
+	return 0;
+}
+
+void cleanup_module(void)
+{
+}
+
+#endif				/* MODULE */