--- /dev/null
+/*
+ * Linux ARCnet driver - "RIM I" (entirely mem-mapped) cards
+ *
+ * Written 1994-1999 by Avery Pennarun.
+ * Written 1999-2000 by Martin Mares <mj@ucw.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 General 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/moduleparam.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/bootmem.h>
+#include <linux/init.h>
+#include <linux/interrupt.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_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");
+
+ BUGLVL(D_NORMAL) printk("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) {
+ BUGLVL(D_NORMAL) printk("No autoprobe for RIM I; you "
+ "must specify the shmem and irq!\n");
+ return -ENODEV;
+ }
+ if (dev->dev_addr[0] == 0) {
+ BUGLVL(D_NORMAL) printk("You need to specify your card's station "
+ "ID!\n");
+ return -ENODEV;
+ }
+ /*
+ * Grab the memory region at mem_start for MIRROR_SIZE bytes.
+ * Later in arcrimi_found() the real size will be determined
+ * and this reserve will be released and the correct size
+ * will be taken.
+ */
+ if (!request_mem_region(dev->mem_start, MIRROR_SIZE, "arcnet (90xx)")) {
+ BUGLVL(D_NORMAL) printk("Card memory already allocated\n");
+ return -ENODEV;
+ }
+ return arcrimi_found(dev);
+}
+
+static int check_mirror(unsigned long addr, size_t size)
+{
+ void __iomem *p;
+ int res = -1;
+
+ if (!request_mem_region(addr, size, "arcnet (90xx)"))
+ return -1;
+
+ p = ioremap(addr, size);
+ if (p) {
+ if (readb(p) == TESTvalue)
+ res = 1;
+ else
+ res = 0;
+ iounmap(p);
+ }
+
+ release_mem_region(addr, size);
+ return res;
+}
+
+/*
+ * 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;
+ unsigned long first_mirror, last_mirror, shmem;
+ void __iomem *p;
+ int mirror_size;
+ int err;
+
+ p = ioremap(dev->mem_start, MIRROR_SIZE);
+ if (!p) {
+ release_mem_region(dev->mem_start, MIRROR_SIZE);
+ BUGMSG(D_NORMAL, "Can't ioremap\n");
+ return -ENODEV;
+ }
+
+ /* reserve the irq */
+ if (request_irq(dev->irq, arcnet_interrupt, 0, "arcnet (RIM I)", dev)) {
+ iounmap(p);
+ release_mem_region(dev->mem_start, MIRROR_SIZE);
+ BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", dev->irq);
+ return -ENODEV;
+ }
+
+ shmem = dev->mem_start;
+ writeb(TESTvalue, p);
+ writeb(dev->dev_addr[0], p + 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 (readb(p) == TESTvalue &&
+ check_mirror(shmem - MIRROR_SIZE, MIRROR_SIZE) == 0 &&
+ check_mirror(shmem - 2 * MIRROR_SIZE, MIRROR_SIZE) == 1)
+ mirror_size = 2 * MIRROR_SIZE;
+
+ first_mirror = shmem - mirror_size;
+ while (check_mirror(first_mirror, mirror_size) == 1)
+ first_mirror -= mirror_size;
+ first_mirror += mirror_size;
+
+ last_mirror = shmem + mirror_size;
+ while (check_mirror(last_mirror, mirror_size) == 1)
+ last_mirror += mirror_size;
+ last_mirror -= mirror_size;
+
+ dev->mem_start = first_mirror;
+ dev->mem_end = last_mirror + MIRROR_SIZE - 1;
+
+ /* initialize the rest of the device structure. */
+
+ lp = netdev_priv(dev);
+ lp->card_name = "RIM I";
+ lp->hw.command = arcrimi_command;
+ lp->hw.status = arcrimi_status;
+ lp->hw.intmask = arcrimi_setmask;
+ lp->hw.reset = arcrimi_reset;
+ lp->hw.owner = THIS_MODULE;
+ lp->hw.copy_to_card = arcrimi_copy_to_card;
+ lp->hw.copy_from_card = arcrimi_copy_from_card;
+
+ /*
+ * re-reserve the memory region - arcrimi_probe() alloced this reqion
+ * but didn't know the real size. Free that region and then re-get
+ * with the correct size. There is a VERY slim chance this could
+ * fail.
+ */
+ iounmap(p);
+ release_mem_region(shmem, MIRROR_SIZE);
+ if (!request_mem_region(dev->mem_start,
+ dev->mem_end - dev->mem_start + 1,
+ "arcnet (90xx)")) {
+ BUGMSG(D_NORMAL, "Card memory already allocated\n");
+ goto err_free_irq;
+ }
+
+ 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_release_mem;
+ }
+
+ /* get and check the station ID from offset 1 in shmem */
+ dev->dev_addr[0] = readb(lp->mem_start + 1);
+
+ 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);
+
+ err = register_netdev(dev);
+ if (err)
+ goto err_unmap;
+
+ return 0;
+
+err_unmap:
+ iounmap(lp->mem_start);
+err_release_mem:
+ release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
+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 = netdev_priv(dev);
+ void __iomem *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_setmask(struct net_device *dev, int mask)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+ void __iomem *ioaddr = lp->mem_start + 0x800;
+
+ AINTMASK(mask);
+}
+
+static int arcrimi_status(struct net_device *dev)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+ void __iomem *ioaddr = lp->mem_start + 0x800;
+
+ return ASTATUS();
+}
+
+static void arcrimi_command(struct net_device *dev, int cmd)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+ void __iomem *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 = netdev_priv(dev);
+ void __iomem *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 = netdev_priv(dev);
+ void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset;
+ TIME("memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
+}
+
+static int node;
+static int io; /* use the insmod io= irq= node= options */
+static int irq;
+static char device[9]; /* use eg. device=arc1 to change name */
+
+module_param(node, int, 0);
+module_param(io, int, 0);
+module_param(irq, int, 0);
+module_param_string(device, device, sizeof(device), 0);
+MODULE_LICENSE("GPL");
+
+static struct net_device *my_dev;
+
+static int __init arc_rimi_init(void)
+{
+ struct net_device *dev;
+
+ dev = alloc_arcdev(device);
+ if (!dev)
+ return -ENOMEM;
+
+ if (node && node != 0xff)
+ dev->dev_addr[0] = node;
+
+ dev->mem_start = io;
+ dev->irq = irq;
+ if (dev->irq == 2)
+ dev->irq = 9;
+
+ if (arcrimi_probe(dev)) {
+ free_netdev(dev);
+ return -EIO;
+ }
+
+ my_dev = dev;
+ return 0;
+}
+
+static void __exit arc_rimi_exit(void)
+{
+ struct net_device *dev = my_dev;
+ struct arcnet_local *lp = netdev_priv(dev);
+
+ unregister_netdev(dev);
+ iounmap(lp->mem_start);
+ release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
+ free_irq(dev->irq, dev);
+ free_netdev(dev);
+}
+
+#ifndef MODULE
+static int __init arcrimi_setup(char *s)
+{
+ int ints[8];
+ s = get_options(s, 8, ints);
+ if (!ints[0])
+ return 1;
+ switch (ints[0]) {
+ default: /* ERROR */
+ printk("arcrimi: Too many arguments.\n");
+ case 3: /* Node ID */
+ node = ints[3];
+ case 2: /* IRQ */
+ irq = ints[2];
+ case 1: /* IO address */
+ io = ints[1];
+ }
+ if (*s)
+ snprintf(device, sizeof(device), "%s", s);
+ return 1;
+}
+__setup("arcrimi=", arcrimi_setup);
+#endif /* MODULE */
+
+module_init(arc_rimi_init)
+module_exit(arc_rimi_exit)
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