/* * 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 * * **********************
*/
staticint arcrimi_probe(struct net_device *dev); staticint arcrimi_found(struct net_device *dev); staticvoid arcrimi_command(struct net_device *dev, int command); staticint arcrimi_status(struct net_device *dev); staticvoid arcrimi_setmask(struct net_device *dev, int mask); staticint arcrimi_reset(struct net_device *dev, int really_reset); staticvoid arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset, void *buf, int count); staticvoid 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)
/* 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.
*/ staticint __init arcrimi_probe(struct net_device *dev)
{ if (BUGLVL(D_NORMAL)) {
pr_info("%s\n", "RIM I (entirely mem-mapped) support");
pr_info("E-mail me if you actually test the RIM I driver, please!\n");
pr_info("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) { if (BUGLVL(D_NORMAL))
pr_err("No autoprobe for RIM I; you must specify the shmem and irq!\n"); return -ENODEV;
} if (dev->dev_addr[0] == 0) { if (BUGLVL(D_NORMAL))
pr_err("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)")) { if (BUGLVL(D_NORMAL))
pr_notice("Card memory already allocated\n"); return -ENODEV;
} return arcrimi_found(dev);
}
staticint check_mirror(unsignedlong 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 (arcnet_readb(p, COM9026_REG_R_STATUS) == 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.
*/ staticint __init arcrimi_found(struct net_device *dev)
{ struct arcnet_local *lp; unsignedlong 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);
arc_printk(D_NORMAL, dev, "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);
arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq); return -ENODEV;
}
shmem = dev->mem_start;
arcnet_writeb(TESTvalue, p, COM9026_REG_W_INTMASK);
arcnet_writeb(TESTvalue, p, COM9026_REG_W_COMMAND); /* actually the station/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 (arcnet_readb(p, COM9026_REG_R_STATUS) == TESTvalue &&
check_mirror(shmem - MIRROR_SIZE, MIRROR_SIZE) == 0 &&
check_mirror(shmem - 2 * MIRROR_SIZE, MIRROR_SIZE) == 1)
mirror_size = 2 * MIRROR_SIZE;
/* 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)")) {
arc_printk(D_NORMAL, dev, "Card memory already allocated\n"); goto err_free_irq;
}
/* 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.
*/ staticint arcrimi_reset(struct net_device *dev, int really_reset)
{ struct arcnet_local *lp = netdev_priv(dev); void __iomem *ioaddr = lp->mem_start + 0x800;
staticint node; staticint io; /* use the insmod io= irq= node= options */ staticint irq; staticchar 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_DESCRIPTION("ARCnet COM90xx RIM I chipset driver");
MODULE_LICENSE("GPL");
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