com90io.c
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上传日期:2013-04-10
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文件大小:11k
- /*
- * 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/ioport.h>
- #include <linux/slab.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 emptyn", 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: %Xn", status);
- ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
- BUGMSG(D_INIT_REASONS, "Status after reset acknowledged: %Xn", 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 failedn");
- 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 */
- if (!request_region(dev->base_addr, ARCNET_TOTAL_SIZE, "arcnet (COM90xx-IO)")) {
- free_irq(dev->irq, dev);
- return -EBUSY;
- }
- /* 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->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.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; /* use the insmod io= irq= shmem= options */
- static int irq;
- static char *device; /* use eg. device=arc1 to change name */
- MODULE_PARM(io, "i");
- MODULE_PARM(irq, "i");
- MODULE_PARM(device, "s");
- MODULE_LICENSE("GPL");
- 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;
- 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);
- 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 0;
- dev = alloc_bootmem(sizeof(struct net_device));
- memset(dev, 0, sizeof(struct net_device));
- 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 devicen");
- return 1;
- }
- __setup("com90io=", com90io_setup);
- #endif /* MODULE */