--- /dev/null
+/*
+ * Linux ARCnet driver - COM90xx chipset (IO-mapped buffers)
+ *
+ * Written 1997 by David Woodhouse.
+ * 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: 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_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;
+
+ 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 (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "com90io probe")) {
+ BUGMSG(D_INIT_REASONS, "IO request_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);
+ goto err_out;
+ }
+ inb(_RESET);
+ mdelay(RESETtime);
+
+ status = ASTATUS();
+
+ if ((status & 0x9D) != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
+ BUGMSG(D_INIT_REASONS, "Status invalid (%Xh).\n", status);
+ goto err_out;
+ }
+ 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);
+ goto err_out;
+ }
+ 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);
+ goto err_out;
+ }
+ 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 ((int)dev->irq <= 0) {
+ BUGMSG(D_INIT_REASONS, "Autoprobe IRQ failed\n");
+ goto err_out;
+ }
+ }
+ release_region(ioaddr, ARCNET_TOTAL_SIZE); /* end of probing */
+ return com90io_found(dev);
+
+err_out:
+ release_region(ioaddr, ARCNET_TOTAL_SIZE);
+ return -ENODEV;
+}
+
+
+/* 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;
+ int err;
+
+ /* 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 */
+ if (!request_region(dev->base_addr, ARCNET_TOTAL_SIZE, "arcnet (COM90xx-IO)")) {
+ free_irq(dev->irq, dev);
+ return -EBUSY;
+ }
+
+ lp = netdev_priv(dev);
+ lp->card_name = "COM90xx I/O";
+ lp->hw.command = com90io_command;
+ lp->hw.status = com90io_status;
+ lp->hw.intmask = com90io_setmask;
+ lp->hw.reset = com90io_reset;
+ lp->hw.owner = THIS_MODULE;
+ lp->hw.copy_to_card = com90io_copy_to_card;
+ lp->hw.copy_from_card = com90io_copy_from_card;
+
+ 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);
+
+ err = register_netdev(dev);
+ if (err) {
+ outb((inb(_CONFIG) & ~IOMAPflag), _CONFIG);
+ free_irq(dev->irq, dev);
+ release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
+ return err;
+ }
+
+ 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 = netdev_priv(dev);
+ 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_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));
+}
+
+static int io; /* use the insmod io= irq= shmem= options */
+static int irq;
+static char device[9]; /* use eg. device=arc1 to change name */
+
+module_param(io, int, 0);
+module_param(irq, int, 0);
+module_param_string(device, device, sizeof(device), 0);
+MODULE_LICENSE("GPL");
+
+#ifndef MODULE
+static int __init com90io_setup(char *s)
+{
+ int ints[4];
+ s = get_options(s, 4, ints);
+ if (!ints[0])
+ return 0;
+ switch (ints[0]) {
+ default: /* ERROR */
+ printk("com90io: Too many arguments.\n");
+ case 2: /* IRQ */
+ irq = ints[2];
+ case 1: /* IO address */
+ io = ints[1];
+ }
+ if (*s)
+ snprintf(device, sizeof(device), "%s", s);
+ return 1;
+}
+__setup("com90io=", com90io_setup);
+#endif
+
+static struct net_device *my_dev;
+
+static int __init com90io_init(void)
+{
+ struct net_device *dev;
+ int err;
+
+ dev = alloc_arcdev(device);
+ if (!dev)
+ return -ENOMEM;
+
+ dev->base_addr = io;
+ dev->irq = irq;
+ if (dev->irq == 2)
+ dev->irq = 9;
+
+ err = com90io_probe(dev);
+
+ if (err) {
+ free_netdev(dev);
+ return err;
+ }
+
+ my_dev = dev;
+ return 0;
+}
+
+static void __exit com90io_exit(void)
+{
+ struct net_device *dev = my_dev;
+ int ioaddr = dev->base_addr;
+
+ unregister_netdev(dev);
+
+ /* 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);
+ free_netdev(dev);
+}
+
+module_init(com90io_init)
+module_exit(com90io_exit)
Code Review / kvmfornfv.git / blobdiff