arc-rimi.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:10k
- /*
- * 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/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: RIM I (entirely mem-mapped) supportn"
- /* 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 %dn",
- 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 allocatedn");
- 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->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.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");
- MODULE_LICENSE("GPL");
- 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;
- unregister_netdev(dev);
- free_irq(dev->irq, dev);
- iounmap(lp->mem_start);
- release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
- 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));
- memset(dev, 0, sizeof(struct net_device));
- 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 devicen");
- return 1;
- }
- __setup("arcrimi=", arcrimi_setup);
- #endif /* MODULE */