arc-rimi.rar_linux arc

/* * Linux ARCnet driver - "RIM I" (entirely mem-mapped) cards * * 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 <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"); BUGMSG(D_NORMAL, "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) { BUGMSG(D_NORMAL, "No autoprobe for RIM I; you " "must specify the shmem and irq!\n"); return -ENODEV; } if (dev->dev_addr[0] == 0) { BUGMSG(D_NORMAL, "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)")) { BUGMSG(D_NORMAL, "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 */ A