patch-2.3.36 linux/drivers/net/arcnet/com90io.c

• Lines: 463
• Date: Sun Jan 2 00:46:32 2000
• Orig file: v2.3.35/linux/drivers/net/arcnet/com90io.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.35/linux/drivers/net/arcnet/com90io.c linux/drivers/net/arcnet/com90io.c
@@ -0,0 +1,462 @@
+/*
+ * Linux ARCnet driver - COM90xx chipset (IO-mapped buffers)
+ * 
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/malloc.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/bootmem.h>
+#include <linux/init.h>
+#include <asm/io.h>
+#include <linux/arcdevice.h>
+
+
+#define VERSION "arcnet: COM90xx IO-mapped mode support (by David Woodhouse et el.)\n"
+
+
+/* Internal function declarations */
+
+static int com90io_found(struct net_device *dev);
+static void com90io_command(struct net_device *dev, int command);
+static int com90io_status(struct net_device *dev);
+static void com90io_setmask(struct net_device *dev, int mask);
+static int com90io_reset(struct net_device *dev, int really_reset);
+static void com90io_openclose(struct net_device *dev, bool open);
+static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset,
+				 void *buf, int count);
+static void com90io_copy_from_card(struct net_device *dev, int bufnum, int offset,
+				   void *buf, int count);
+
+
+/* Handy defines for ARCnet specific stuff */
+
+/* The number of low I/O ports used by the card. */
+#define ARCNET_TOTAL_SIZE 16
+
+/* COM 9026 controller chip --> ARCnet register addresses */
+#define _INTMASK (ioaddr+0)	/* writable */
+#define _STATUS  (ioaddr+0)	/* readable */
+#define _COMMAND (ioaddr+1)	/* writable, returns random vals on read (?) */
+#define _RESET  (ioaddr+8)	/* software reset (on read) */
+#define _MEMDATA  (ioaddr+12)	/* Data port for IO-mapped memory */
+#define _ADDR_HI  (ioaddr+15)	/* Control registers for said */
+#define _ADDR_LO  (ioaddr+14)
+#define _CONFIG  (ioaddr+2)	/* Configuration register */
+
+#undef ASTATUS
+#undef ACOMMAND
+#undef AINTMASK
+
+#define ASTATUS()	inb(_STATUS)
+#define ACOMMAND(cmd) outb((cmd),_COMMAND)
+#define AINTMASK(msk)	outb((msk),_INTMASK)
+#define SETCONF() 	outb((lp->config),_CONFIG)
+
+
+/****************************************************************************
+ *                                                                          *
+ * IO-mapped operation routines                                             *
+ *                                                                          *
+ ****************************************************************************/
+
+#undef ONE_AT_A_TIME_TX
+#undef ONE_AT_A_TIME_RX
+
+static u_char get_buffer_byte(struct net_device *dev, unsigned offset)
+{
+	int ioaddr = dev->base_addr;
+
+	outb(offset >> 8, _ADDR_HI);
+	outb(offset & 0xff, _ADDR_LO);
+
+	return inb(_MEMDATA);
+}
+
+#ifdef ONE_AT_A_TIME_TX
+static void put_buffer_byte(struct net_device *dev, unsigned offset, u_char datum)
+{
+	int ioaddr = dev->base_addr;
+
+	outb(offset >> 8, _ADDR_HI);
+	outb(offset & 0xff, _ADDR_LO);
+
+	outb(datum, _MEMDATA);
+}
+
+#endif
+
+
+static void get_whole_buffer(struct net_device *dev, unsigned offset, unsigned length, char *dest)
+{
+	int ioaddr = dev->base_addr;
+
+	outb((offset >> 8) | AUTOINCflag, _ADDR_HI);
+	outb(offset & 0xff, _ADDR_LO);
+
+	while (length--)
+#ifdef ONE_AT_A_TIME_RX
+		*(dest++) = get_buffer_byte(dev, offset++);
+#else
+		*(dest++) = inb(_MEMDATA);
+#endif
+}
+
+static void put_whole_buffer(struct net_device *dev, unsigned offset, unsigned length, char *dest)
+{
+	int ioaddr = dev->base_addr;
+
+	outb((offset >> 8) | AUTOINCflag, _ADDR_HI);
+	outb(offset & 0xff, _ADDR_LO);
+
+	while (length--)
+#ifdef ONE_AT_A_TIME_TX
+		put_buffer_byte(dev, offset++, *(dest++));
+#else
+		outb(*(dest++), _MEMDATA);
+#endif
+}
+
+/*
+ * We cannot probe for an IO mapped card either, although we can check that
+ * it's where we were told it was, and even autoirq
+ */
+static int __init com90io_probe(struct net_device *dev)
+{
+	int ioaddr = dev->base_addr, status;
+	unsigned long airqmask;
+
+#ifndef MODULE
+	arcnet_init();
+#endif
+
+	BUGLVL(D_NORMAL) printk(VERSION);
+	BUGLVL(D_NORMAL) printk("E-mail me if you actually test this driver, please!\n");
+
+	if (!ioaddr) {
+		BUGMSG(D_NORMAL, "No autoprobe for IO mapped cards; you "
+		       "must specify the base address!\n");
+		return -ENODEV;
+	}
+	if (check_region(ioaddr, ARCNET_TOTAL_SIZE)) {
+		BUGMSG(D_INIT_REASONS, "IO check_region %x-%x failed.\n",
+		       ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1);
+		return -ENXIO;
+	}
+	if (ASTATUS() == 0xFF) {
+		BUGMSG(D_INIT_REASONS, "IO address %x empty\n", ioaddr);
+		return -ENODEV;
+	}
+	inb(_RESET);
+	mdelay(RESETtime);
+
+	status = ASTATUS();
+
+	if ((status & 0x9D) != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
+		BUGMSG(D_INIT_REASONS, "Status invalid (%Xh).\n", status);
+		return -ENODEV;
+	}
+	BUGMSG(D_INIT_REASONS, "Status after reset: %X\n", status);
+
+	ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
+
+	BUGMSG(D_INIT_REASONS, "Status after reset acknowledged: %X\n", status);
+
+	status = ASTATUS();
+
+	if (status & RESETflag) {
+		BUGMSG(D_INIT_REASONS, "Eternal reset (status=%Xh)\n", status);
+		return -ENODEV;
+	}
+	outb((0x16 | IOMAPflag) & ~ENABLE16flag, _CONFIG);
+
+	/* Read first loc'n of memory */
+
+	outb(AUTOINCflag, _ADDR_HI);
+	outb(0, _ADDR_LO);
+
+	if ((status = inb(_MEMDATA)) != 0xd1) {
+		BUGMSG(D_INIT_REASONS, "Signature byte not found"
+		       " (%Xh instead).\n", status);
+		return -ENODEV;
+	}
+	if (!dev->irq) {
+		/*
+		 * if we do this, we're sure to get an IRQ since the
+		 * card has just reset and the NORXflag is on until
+		 * we tell it to start receiving.
+		 */
+
+		airqmask = probe_irq_on();
+		outb(NORXflag, _INTMASK);
+		udelay(1);
+		outb(0, _INTMASK);
+		dev->irq = probe_irq_off(airqmask);
+
+		if (dev->irq <= 0) {
+			BUGMSG(D_INIT_REASONS, "Autoprobe IRQ failed\n");
+			return -ENODEV;
+		}
+	}
+	return com90io_found(dev);
+}
+
+
+/* Set up the struct net_device associated with this card.  Called after
+ * probing succeeds.
+ */
+static int __init com90io_found(struct net_device *dev)
+{
+	struct arcnet_local *lp;
+	int ioaddr = dev->base_addr;
+
+	/* Reserve the irq */
+	if (request_irq(dev->irq, &arcnet_interrupt, 0, "arcnet (COM90xx-IO)", 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(dev->base_addr, ARCNET_TOTAL_SIZE, "arcnet (COM90xx-IO)");
+
+	/* Initialize the rest of the device structure. */
+	dev->priv = kmalloc(sizeof(struct arcnet_local), GFP_KERNEL);
+	if (!dev->priv) {
+		free_irq(dev->irq, dev);
+		release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
+		return -ENOMEM;
+	}
+	memset(dev->priv, 0, sizeof(struct arcnet_local));
+
+	lp = (struct arcnet_local *) (dev->priv);
+	lp->hw.command = com90io_command;
+	lp->hw.status = com90io_status;
+	lp->hw.intmask = com90io_setmask;
+	lp->hw.reset = com90io_reset;
+	lp->hw.open_close = com90io_openclose;
+	lp->hw.copy_to_card = com90io_copy_to_card;
+	lp->hw.copy_from_card = com90io_copy_from_card;
+
+	/*
+	 * Fill in the fields of the device structure with generic
+	 * values.
+	 */
+	arcdev_setup(dev);
+
+	lp->config = (0x16 | IOMAPflag) & ~ENABLE16flag;
+	SETCONF();
+
+	/* get and check the station ID from offset 1 in shmem */
+
+	dev->dev_addr[0] = get_buffer_byte(dev, 1);
+
+	BUGMSG(D_NORMAL, "COM90IO: station %02Xh found at %03lXh, IRQ %d.\n",
+	       dev->dev_addr[0], dev->base_addr, dev->irq);
+
+	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 com90io_reset(struct net_device *dev, int really_reset)
+{
+	struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
+	short ioaddr = dev->base_addr;
+
+	BUGMSG(D_INIT, "Resetting %s (status=%02Xh)\n", dev->name, ASTATUS());
+
+	if (really_reset) {
+		/* reset the card */
+		inb(_RESET);
+		mdelay(RESETtime);
+	}
+	/* Set the thing to IO-mapped, 8-bit  mode */
+	lp->config = (0x1C | IOMAPflag) & ~ENABLE16flag;
+	SETCONF();
+
+	ACOMMAND(CFLAGScmd | RESETclear);	/* clear flags & end reset */
+	ACOMMAND(CFLAGScmd | CONFIGclear);
+
+	/* verify that the ARCnet signature byte is present */
+	if (get_buffer_byte(dev, 0) != 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 com90io_command(struct net_device *dev, int cmd)
+{
+	short ioaddr = dev->base_addr;
+
+	ACOMMAND(cmd);
+}
+
+
+static int com90io_status(struct net_device *dev)
+{
+	short ioaddr = dev->base_addr;
+
+	return ASTATUS();
+}
+
+
+static void com90io_setmask(struct net_device *dev, int mask)
+{
+	short ioaddr = dev->base_addr;
+
+	AINTMASK(mask);
+}
+
+static void com90io_openclose(struct net_device *dev, int open)
+{
+	if (open)
+		MOD_INC_USE_COUNT;
+	else
+		MOD_DEC_USE_COUNT;
+}
+
+static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset,
+				 void *buf, int count)
+{
+	TIME("put_whole_buffer", count, put_whole_buffer(dev, bufnum * 512 + offset, count, buf));
+}
+
+
+static void com90io_copy_from_card(struct net_device *dev, int bufnum, int offset,
+				   void *buf, int count)
+{
+	TIME("get_whole_buffer", count, get_whole_buffer(dev, bufnum * 512 + offset, count, buf));
+}
+
+
+#ifdef MODULE
+
+static struct net_device *my_dev;
+
+/* Module parameters */
+
+static int io = 0x0;		/* use the insmod io= irq= shmem= options */
+static int irq = 0;
+static char *device;		/* use eg. device=arc1 to change name */
+
+MODULE_PARM(io, "i");
+MODULE_PARM(irq, "i");
+MODULE_PARM(device, "s");
+
+int init_module(void)
+{
+	struct net_device *dev;
+	int err;
+
+	dev = dev_alloc(device ? : "arc%d", &err);
+	if (!dev)
+		return err;
+
+	dev->base_addr = io;
+	dev->irq = irq;
+	if (dev->irq == 2)
+		dev->irq = 9;
+
+	if (com90io_probe(dev))
+		return -EIO;
+
+	my_dev = dev;
+	return 0;
+}
+
+void cleanup_module(void)
+{
+	struct net_device *dev = my_dev;
+	int ioaddr = dev->base_addr;
+
+	if (dev->start)
+		dev->stop(dev);
+
+	/* Flush TX and disable RX */
+	AINTMASK(0);		/* disable IRQ's */
+	ACOMMAND(NOTXcmd);	/* stop transmit */
+	ACOMMAND(NORXcmd);	/* disable receive */
+
+	/* Set the thing back to MMAP mode, in case the old driver is loaded later */
+	outb((inb(_CONFIG) & ~IOMAPflag), _CONFIG);
+
+	free_irq(dev->irq, dev);
+	release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
+	unregister_netdev(dev);
+	kfree(dev->priv);
+	kfree(dev);
+}
+
+#else
+
+static int __init com90io_setup(char *s)
+{
+	struct net_device *dev;
+	int ints[4];
+
+	s = get_options(s, 4, ints);
+	if (!ints[0])
+		return 1;
+	dev = alloc_bootmem(sizeof(struct net_device) + 10);
+	memset(dev, 0, sizeof(struct net_device) + 10);
+	dev->name = (char *) (dev + 1);
+	dev->init = com90io_probe;
+
+	switch (ints[0]) {
+	default:		/* ERROR */
+		printk("com90io: Too many arguments.\n");
+	case 2:		/* IRQ */
+		dev->irq = ints[2];
+	case 1:		/* IO address */
+		dev->base_addr = ints[1];
+	}
+	if (*s)
+		strncpy(dev->name, s, 9);
+	else
+		strcpy(dev->name, "arc%d");
+	if (register_netdev(dev))
+		printk(KERN_ERR "com90io: Cannot register arcnet device\n");
+
+	return 1;
+}
+
+__setup("com90io=", com90io_setup);
+
+#endif				/* MODULE */