patch-2.3.36 linux/drivers/net/arcnet/arc-rimi.c

• Lines: 384
• Date: Sun Jan 2 00:46:32 2000
• Orig file: v2.3.35/linux/drivers/net/arcnet/arc-rimi.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.35/linux/drivers/net/arcnet/arc-rimi.c linux/drivers/net/arcnet/arc-rimi.c
@@ -0,0 +1,383 @@
+/*
+ * Linux ARCnet driver - "RIM I" (entirely mem-mapped) cards
+ * 
+ * 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: RIM I (entirely mem-mapped) support\n"
+
+
+/* Internal function declarations */
+
+static int arcrimi_probe(struct net_device *dev);
+static int arcrimi_found(struct net_device *dev);
+static void arcrimi_command(struct net_device *dev, int command);
+static int arcrimi_status(struct net_device *dev);
+static void arcrimi_setmask(struct net_device *dev, int mask);
+static int arcrimi_reset(struct net_device *dev, int really_reset);
+static void arcrimi_openclose(struct net_device *dev, bool open);
+static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset,
+				 void *buf, int count);
+static void arcrimi_copy_from_card(struct net_device *dev, int bufnum, int offset,
+				   void *buf, int count);
+
+/* Handy defines for ARCnet specific stuff */
+
+/* Amount of I/O memory used by the card */
+#define BUFFER_SIZE (512)
+#define MIRROR_SIZE (BUFFER_SIZE*4)
+
+/* 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()	readb(_STATUS)
+#define ACOMMAND(cmd)	writeb((cmd),_COMMAND)
+#define AINTMASK(msk)	writeb((msk),_INTMASK)
+#define SETCONF()	writeb(lp->config,_CONFIG)
+
+
+/*
+ * We cannot probe for a RIM I card; one reason is I don't know how to reset
+ * them.  In fact, we can't even get their node ID automatically.  So, we
+ * need to be passed a specific shmem address, IRQ, and node ID.
+ */
+static int __init arcrimi_probe(struct net_device *dev)
+{
+	BUGLVL(D_NORMAL) printk(VERSION);
+	BUGLVL(D_NORMAL) printk("E-mail me if you actually test the RIM I driver, please!\n");
+
+	BUGMSG(D_NORMAL, "Given: node %02Xh, shmem %lXh, irq %d\n",
+	       dev->dev_addr[0], dev->mem_start, dev->irq);
+
+	if (dev->mem_start <= 0 || dev->irq <= 0) {
+		BUGMSG(D_NORMAL, "No autoprobe for RIM I; you "
+		       "must specify the shmem and irq!\n");
+		return -ENODEV;
+	}
+	if (check_mem_region(dev->mem_start, BUFFER_SIZE)) {
+		BUGMSG(D_NORMAL, "Card memory already allocated\n");
+		return -ENODEV;
+	}
+	if (dev->dev_addr[0] == 0) {
+		BUGMSG(D_NORMAL, "You need to specify your card's station "
+		       "ID!\n");
+		return -ENODEV;
+	}
+	return arcrimi_found(dev);
+}
+
+
+/*
+ * Set up the struct net_device associated with this card.  Called after
+ * probing succeeds.
+ */
+static int __init arcrimi_found(struct net_device *dev)
+{
+	struct arcnet_local *lp;
+	u_long first_mirror, last_mirror, shmem;
+	int mirror_size;
+
+	/* reserve the irq */  {
+		if (request_irq(dev->irq, &arcnet_interrupt, 0, "arcnet (RIM I)", dev))
+			BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", dev->irq);
+		return -ENODEV;
+	}
+
+	shmem = dev->mem_start;
+	isa_writeb(TESTvalue, shmem);
+	isa_writeb(dev->dev_addr[0], shmem + 1);	/* actually the node ID */
+
+	/* find the real shared memory start/end points, including mirrors */
+
+	/* guess the actual size of one "memory mirror" - the number of
+	 * bytes between copies of the shared memory.  On most cards, it's
+	 * 2k (or there are no mirrors at all) but on some, it's 4k.
+	 */
+	mirror_size = MIRROR_SIZE;
+	if (isa_readb(shmem) == TESTvalue
+	    && isa_readb(shmem - mirror_size) != TESTvalue
+	    && isa_readb(shmem - 2 * mirror_size) == TESTvalue)
+		mirror_size *= 2;
+
+	first_mirror = last_mirror = shmem;
+	while (isa_readb(first_mirror) == TESTvalue)
+		first_mirror -= mirror_size;
+	first_mirror += mirror_size;
+
+	while (isa_readb(last_mirror) == TESTvalue)
+		last_mirror += mirror_size;
+	last_mirror -= mirror_size;
+
+	dev->mem_start = first_mirror;
+	dev->mem_end = last_mirror + MIRROR_SIZE - 1;
+	dev->rmem_start = dev->mem_start + BUFFER_SIZE * 0;
+	dev->rmem_end = dev->mem_start + BUFFER_SIZE * 2 - 1;
+
+	/* initialize the rest of the device structure. */
+
+	lp = dev->priv = kmalloc(sizeof(struct arcnet_local), GFP_KERNEL);
+	if (!lp) {
+		BUGMSG(D_NORMAL, "Can't allocate device data!\n");
+		goto err_free_irq;
+	}
+	lp->hw.command = arcrimi_command;
+	lp->hw.status = arcrimi_status;
+	lp->hw.intmask = arcrimi_setmask;
+	lp->hw.reset = arcrimi_reset;
+	lp->hw.open_close = arcrimi_openclose;
+	lp->hw.copy_to_card = arcrimi_copy_to_card;
+	lp->hw.copy_from_card = arcrimi_copy_from_card;
+	lp->mem_start = ioremap(dev->mem_start, dev->mem_end - dev->mem_start + 1);
+	if (!lp->mem_start) {
+		BUGMSG(D_NORMAL, "Can't remap device memory!\n");
+		goto err_free_dev_priv;
+	}
+	/* Fill in the fields of the device structure with generic
+	 * values.
+	 */
+	arcdev_setup(dev);
+
+	/* get and check the station ID from offset 1 in shmem */
+	dev->dev_addr[0] = readb(lp->mem_start + 1);
+
+	/* reserve the memory region - guaranteed to work by check_region */
+	request_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1, "arcnet (90xx)");
+
+	BUGMSG(D_NORMAL, "ARCnet RIM I: station %02Xh found at IRQ %d, "
+	       "ShMem %lXh (%ld*%d bytes).\n",
+	       dev->dev_addr[0],
+	       dev->irq, dev->mem_start,
+	 (dev->mem_end - dev->mem_start + 1) / mirror_size, mirror_size);
+
+	return 0;
+
+      err_free_dev_priv:
+	kfree(dev->priv);
+      err_free_irq:
+	free_irq(dev->irq, dev);
+	return -EIO;
+}
+
+
+/*
+ * 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 arcrimi_reset(struct net_device *dev, int really_reset)
+{
+	struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
+	void *ioaddr = lp->mem_start + 0x800;
+
+	BUGMSG(D_INIT, "Resetting %s (status=%02Xh)\n", dev->name, ASTATUS());
+
+	if (really_reset) {
+		writeb(TESTvalue, ioaddr - 0x800);	/* fake reset */
+		return 0;
+	}
+	ACOMMAND(CFLAGScmd | RESETclear);	/* clear flags & end reset */
+	ACOMMAND(CFLAGScmd | CONFIGclear);
+
+	/* enable extended (512-byte) packets */
+	ACOMMAND(CONFIGcmd | EXTconf);
+
+	/* done!  return success. */
+	return 0;
+}
+
+
+static void arcrimi_openclose(struct net_device *dev, int open)
+{
+	if (open)
+		MOD_INC_USE_COUNT;
+	else
+		MOD_DEC_USE_COUNT;
+}
+
+static void arcrimi_setmask(struct net_device *dev, int mask)
+{
+	struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
+	void *ioaddr = lp->mem_start + 0x800;
+
+	AINTMASK(mask);
+}
+
+static int arcrimi_status(struct net_device *dev)
+{
+	struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
+	void *ioaddr = lp->mem_start + 0x800;
+
+	return ASTATUS();
+}
+
+static void arcrimi_command(struct net_device *dev, int cmd)
+{
+	struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
+	void *ioaddr = lp->mem_start + 0x800;
+
+	ACOMMAND(cmd);
+}
+
+static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset,
+				 void *buf, int count)
+{
+	struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
+	void *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset;
+	TIME("memcpy_toio", count, memcpy_toio(memaddr, buf, count));
+}
+
+
+static void arcrimi_copy_from_card(struct net_device *dev, int bufnum, int offset,
+				   void *buf, int count)
+{
+	struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
+	void *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset;
+	TIME("memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
+}
+
+#ifdef MODULE
+
+static struct net_device *my_dev;
+
+/* Module parameters */
+
+static int node = 0;
+static int io = 0x0;		/* <--- EDIT THESE LINES FOR YOUR CONFIGURATION */
+static int irq = 0;		/* or use the insmod io= irq= shmem= options */
+static char *device;		/* use eg. device="arc1" to change name */
+
+MODULE_PARM(node, "i");
+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;
+
+	if (node && node != 0xff)
+		dev->dev_addr[0] = node;
+
+	dev->base_addr = io;
+	dev->irq = irq;
+	if (dev->irq == 2)
+		dev->irq = 9;
+
+	if (arcrimi_probe(dev))
+		return -EIO;
+
+	my_dev = dev;
+	return 0;
+}
+
+void cleanup_module(void)
+{
+	struct net_device *dev = my_dev;
+	struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
+	void *ioaddr = lp->mem_start + 0x800;
+
+	if (dev->start)
+		dev->stop(dev);
+
+	/* Flush TX and disable RX */
+	AINTMASK(0);		/* disable IRQ's */
+	ACOMMAND(NOTXcmd);	/* stop transmit */
+	ACOMMAND(NORXcmd);	/* disable receive */
+
+	free_irq(dev->irq, dev);
+	iounmap(lp->mem_start);
+	release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
+	unregister_netdev(dev);
+	kfree(dev->priv);
+	kfree(dev);
+}
+
+#else
+
+static int __init arcrimi_setup(char *s)
+{
+	struct net_device *dev;
+	int ints[8];
+
+	s = get_options(s, 8, 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 = arcrimi_probe;
+
+	switch (ints[0]) {
+	default:		/* ERROR */
+		printk("arcrimi: Too many arguments.\n");
+	case 3:		/* Node ID */
+		dev->dev_addr[0] = ints[3];
+	case 2:		/* IRQ */
+		dev->irq = ints[2];
+	case 1:		/* IO address */
+		dev->mem_start = ints[1];
+	}
+	if (*s)
+		strncpy(dev->name, s, 9);
+	else
+		strcpy(dev->name, "arc%d");
+	if (register_netdev(dev))
+		printk(KERN_ERR "arc-rimi: Cannot register arcnet device\n");
+
+	return 1;
+}
+
+__setup("arcrimi=", arcrimi_setup);
+
+#endif				/* MODULE */