diff options
Diffstat (limited to 'drivers/net/arcnet/arc-rimi.c')
| -rw-r--r-- | drivers/net/arcnet/arc-rimi.c | 385 |
1 files changed, 385 insertions, 0 deletions
diff --git a/drivers/net/arcnet/arc-rimi.c b/drivers/net/arcnet/arc-rimi.c new file mode 100644 index 000000000..8c3ccc7c8 --- /dev/null +++ b/drivers/net/arcnet/arc-rimi.c @@ -0,0 +1,385 @@ +/* + * 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 + * + * ********************** + */ + +#define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt + +#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/memblock.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> + +#include "arcdevice.h" +#include "com9026.h" + +/* 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) + +/* 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) +{ + 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); +} + +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 (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. + */ +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); + 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; + + 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)")) { + arc_printk(D_NORMAL, dev, "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) { + arc_printk(D_NORMAL, dev, "Can't remap device memory!\n"); + goto err_release_mem; + } + + /* get and check the station ID from offset 1 in shmem */ + arcnet_set_addr(dev, arcnet_readb(lp->mem_start, + COM9026_REG_R_STATION)); + + arc_printk(D_NORMAL, dev, "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; + + arc_printk(D_INIT, dev, "Resetting %s (status=%02Xh)\n", + dev->name, arcnet_readb(ioaddr, COM9026_REG_R_STATUS)); + + if (really_reset) { + arcnet_writeb(TESTvalue, ioaddr, -0x800); /* fake reset */ + return 0; + } + /* clear flags & end reset */ + arcnet_writeb(CFLAGScmd | RESETclear, ioaddr, COM9026_REG_W_COMMAND); + arcnet_writeb(CFLAGScmd | CONFIGclear, ioaddr, COM9026_REG_W_COMMAND); + + /* enable extended (512-byte) packets */ + arcnet_writeb(CONFIGcmd | EXTconf, ioaddr, COM9026_REG_W_COMMAND); + + /* done! return success. */ + return 0; +} + +static void arcrimi_setmask(struct net_device *dev, int mask) +{ + struct arcnet_local *lp = netdev_priv(dev); + void __iomem *ioaddr = lp->mem_start + 0x800; + + arcnet_writeb(mask, ioaddr, COM9026_REG_W_INTMASK); +} + +static int arcrimi_status(struct net_device *dev) +{ + struct arcnet_local *lp = netdev_priv(dev); + void __iomem *ioaddr = lp->mem_start + 0x800; + + return arcnet_readb(ioaddr, COM9026_REG_R_STATUS); +} + +static void arcrimi_command(struct net_device *dev, int cmd) +{ + struct arcnet_local *lp = netdev_priv(dev); + void __iomem *ioaddr = lp->mem_start + 0x800; + + arcnet_writeb(cmd, ioaddr, COM9026_REG_W_COMMAND); +} + +static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset, + void *buf, int count) +{ + struct arcnet_local *lp = netdev_priv(dev); + void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset; + + TIME(dev, "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 = netdev_priv(dev); + void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset; + + TIME(dev, "memcpy_fromio", count, memcpy_fromio(buf, memaddr, count)); +} + +static int node; +static int io; /* use the insmod io= irq= node= options */ +static int irq; +static char 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_LICENSE("GPL"); + +static struct net_device *my_dev; + +static int __init arc_rimi_init(void) +{ + struct net_device *dev; + + dev = alloc_arcdev(device); + if (!dev) + return -ENOMEM; + + if (node && node != 0xff) + arcnet_set_addr(dev, node); + + dev->mem_start = io; + dev->irq = irq; + if (dev->irq == 2) + dev->irq = 9; + + if (arcrimi_probe(dev)) { + free_arcdev(dev); + return -EIO; + } + + my_dev = dev; + return 0; +} + +static void __exit arc_rimi_exit(void) +{ + struct net_device *dev = my_dev; + struct arcnet_local *lp = netdev_priv(dev); + + unregister_netdev(dev); + iounmap(lp->mem_start); + release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1); + free_irq(dev->irq, dev); + free_arcdev(dev); +} + +#ifndef MODULE +static int __init arcrimi_setup(char *s) +{ + int ints[8]; + + s = get_options(s, 8, ints); + if (!ints[0]) + return 1; + switch (ints[0]) { + default: /* ERROR */ + pr_err("Too many arguments\n"); + fallthrough; + case 3: /* Node ID */ + node = ints[3]; + fallthrough; + case 2: /* IRQ */ + irq = ints[2]; + fallthrough; + case 1: /* IO address */ + io = ints[1]; + } + if (*s) + snprintf(device, sizeof(device), "%s", s); + return 1; +} +__setup("arcrimi=", arcrimi_setup); +#endif /* MODULE */ + +module_init(arc_rimi_init) +module_exit(arc_rimi_exit) |