385 строки
10 KiB
C
385 строки
10 KiB
C
/*
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* Linux ARCnet driver - "RIM I" (entirely mem-mapped) cards
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*
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* Written 1994-1999 by Avery Pennarun.
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* Written 1999-2000 by Martin Mares <mj@ucw.cz>.
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* Derived from skeleton.c by Donald Becker.
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*
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* Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
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* for sponsoring the further development of this driver.
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*
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* **********************
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*
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* The original copyright of skeleton.c was as follows:
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*
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* skeleton.c Written 1993 by Donald Becker.
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* Copyright 1993 United States Government as represented by the
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* Director, National Security Agency. This software may only be used
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* and distributed according to the terms of the GNU General Public License as
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* modified by SRC, incorporated herein by reference.
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*
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* **********************
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*
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* For more details, see drivers/net/arcnet.c
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*
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* **********************
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*/
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#define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/memblock.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include "arcdevice.h"
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#include "com9026.h"
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/* Internal function declarations */
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static int arcrimi_probe(struct net_device *dev);
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static int arcrimi_found(struct net_device *dev);
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static void arcrimi_command(struct net_device *dev, int command);
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static int arcrimi_status(struct net_device *dev);
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static void arcrimi_setmask(struct net_device *dev, int mask);
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static int arcrimi_reset(struct net_device *dev, int really_reset);
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static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset,
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void *buf, int count);
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static void arcrimi_copy_from_card(struct net_device *dev, int bufnum,
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int offset, void *buf, int count);
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/* Handy defines for ARCnet specific stuff */
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/* Amount of I/O memory used by the card */
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#define BUFFER_SIZE (512)
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#define MIRROR_SIZE (BUFFER_SIZE * 4)
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/* We cannot probe for a RIM I card; one reason is I don't know how to reset
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* them. In fact, we can't even get their node ID automatically. So, we
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* need to be passed a specific shmem address, IRQ, and node ID.
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*/
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static int __init arcrimi_probe(struct net_device *dev)
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{
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if (BUGLVL(D_NORMAL)) {
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pr_info("%s\n", "RIM I (entirely mem-mapped) support");
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pr_info("E-mail me if you actually test the RIM I driver, please!\n");
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pr_info("Given: node %02Xh, shmem %lXh, irq %d\n",
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dev->dev_addr[0], dev->mem_start, dev->irq);
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}
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if (dev->mem_start <= 0 || dev->irq <= 0) {
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if (BUGLVL(D_NORMAL))
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pr_err("No autoprobe for RIM I; you must specify the shmem and irq!\n");
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return -ENODEV;
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}
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if (dev->dev_addr[0] == 0) {
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if (BUGLVL(D_NORMAL))
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pr_err("You need to specify your card's station ID!\n");
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return -ENODEV;
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}
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/* Grab the memory region at mem_start for MIRROR_SIZE bytes.
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* Later in arcrimi_found() the real size will be determined
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* and this reserve will be released and the correct size
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* will be taken.
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*/
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if (!request_mem_region(dev->mem_start, MIRROR_SIZE, "arcnet (90xx)")) {
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if (BUGLVL(D_NORMAL))
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pr_notice("Card memory already allocated\n");
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return -ENODEV;
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}
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return arcrimi_found(dev);
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}
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static int check_mirror(unsigned long addr, size_t size)
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{
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void __iomem *p;
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int res = -1;
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if (!request_mem_region(addr, size, "arcnet (90xx)"))
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return -1;
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p = ioremap(addr, size);
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if (p) {
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if (arcnet_readb(p, COM9026_REG_R_STATUS) == TESTvalue)
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res = 1;
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else
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res = 0;
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iounmap(p);
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}
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release_mem_region(addr, size);
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return res;
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}
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/* Set up the struct net_device associated with this card.
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* Called after probing succeeds.
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*/
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static int __init arcrimi_found(struct net_device *dev)
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{
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struct arcnet_local *lp;
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unsigned long first_mirror, last_mirror, shmem;
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void __iomem *p;
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int mirror_size;
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int err;
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p = ioremap(dev->mem_start, MIRROR_SIZE);
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if (!p) {
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release_mem_region(dev->mem_start, MIRROR_SIZE);
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arc_printk(D_NORMAL, dev, "Can't ioremap\n");
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return -ENODEV;
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}
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/* reserve the irq */
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if (request_irq(dev->irq, arcnet_interrupt, 0, "arcnet (RIM I)", dev)) {
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iounmap(p);
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release_mem_region(dev->mem_start, MIRROR_SIZE);
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arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq);
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return -ENODEV;
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}
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shmem = dev->mem_start;
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arcnet_writeb(TESTvalue, p, COM9026_REG_W_INTMASK);
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arcnet_writeb(TESTvalue, p, COM9026_REG_W_COMMAND);
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/* actually the station/node ID */
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/* find the real shared memory start/end points, including mirrors */
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/* guess the actual size of one "memory mirror" - the number of
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* bytes between copies of the shared memory. On most cards, it's
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* 2k (or there are no mirrors at all) but on some, it's 4k.
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*/
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mirror_size = MIRROR_SIZE;
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if (arcnet_readb(p, COM9026_REG_R_STATUS) == TESTvalue &&
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check_mirror(shmem - MIRROR_SIZE, MIRROR_SIZE) == 0 &&
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check_mirror(shmem - 2 * MIRROR_SIZE, MIRROR_SIZE) == 1)
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mirror_size = 2 * MIRROR_SIZE;
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first_mirror = shmem - mirror_size;
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while (check_mirror(first_mirror, mirror_size) == 1)
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first_mirror -= mirror_size;
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first_mirror += mirror_size;
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last_mirror = shmem + mirror_size;
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while (check_mirror(last_mirror, mirror_size) == 1)
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last_mirror += mirror_size;
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last_mirror -= mirror_size;
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dev->mem_start = first_mirror;
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dev->mem_end = last_mirror + MIRROR_SIZE - 1;
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/* initialize the rest of the device structure. */
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lp = netdev_priv(dev);
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lp->card_name = "RIM I";
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lp->hw.command = arcrimi_command;
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lp->hw.status = arcrimi_status;
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lp->hw.intmask = arcrimi_setmask;
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lp->hw.reset = arcrimi_reset;
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lp->hw.owner = THIS_MODULE;
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lp->hw.copy_to_card = arcrimi_copy_to_card;
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lp->hw.copy_from_card = arcrimi_copy_from_card;
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/* re-reserve the memory region - arcrimi_probe() alloced this reqion
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* but didn't know the real size. Free that region and then re-get
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* with the correct size. There is a VERY slim chance this could
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* fail.
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*/
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iounmap(p);
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release_mem_region(shmem, MIRROR_SIZE);
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if (!request_mem_region(dev->mem_start,
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dev->mem_end - dev->mem_start + 1,
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"arcnet (90xx)")) {
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arc_printk(D_NORMAL, dev, "Card memory already allocated\n");
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goto err_free_irq;
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}
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lp->mem_start = ioremap(dev->mem_start,
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dev->mem_end - dev->mem_start + 1);
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if (!lp->mem_start) {
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arc_printk(D_NORMAL, dev, "Can't remap device memory!\n");
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goto err_release_mem;
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}
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/* get and check the station ID from offset 1 in shmem */
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dev->dev_addr[0] = arcnet_readb(lp->mem_start, COM9026_REG_R_STATION);
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arc_printk(D_NORMAL, dev, "ARCnet RIM I: station %02Xh found at IRQ %d, ShMem %lXh (%ld*%d bytes)\n",
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dev->dev_addr[0],
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dev->irq, dev->mem_start,
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(dev->mem_end - dev->mem_start + 1) / mirror_size,
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mirror_size);
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err = register_netdev(dev);
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if (err)
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goto err_unmap;
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return 0;
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err_unmap:
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iounmap(lp->mem_start);
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err_release_mem:
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release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
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err_free_irq:
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free_irq(dev->irq, dev);
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return -EIO;
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}
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/* Do a hardware reset on the card, and set up necessary registers.
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*
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* This should be called as little as possible, because it disrupts the
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* token on the network (causes a RECON) and requires a significant delay.
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*
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* However, it does make sure the card is in a defined state.
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*/
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static int arcrimi_reset(struct net_device *dev, int really_reset)
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{
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struct arcnet_local *lp = netdev_priv(dev);
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void __iomem *ioaddr = lp->mem_start + 0x800;
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arc_printk(D_INIT, dev, "Resetting %s (status=%02Xh)\n",
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dev->name, arcnet_readb(ioaddr, COM9026_REG_R_STATUS));
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if (really_reset) {
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arcnet_writeb(TESTvalue, ioaddr, -0x800); /* fake reset */
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return 0;
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}
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/* clear flags & end reset */
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arcnet_writeb(CFLAGScmd | RESETclear, ioaddr, COM9026_REG_W_COMMAND);
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arcnet_writeb(CFLAGScmd | CONFIGclear, ioaddr, COM9026_REG_W_COMMAND);
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/* enable extended (512-byte) packets */
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arcnet_writeb(CONFIGcmd | EXTconf, ioaddr, COM9026_REG_W_COMMAND);
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/* done! return success. */
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return 0;
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}
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static void arcrimi_setmask(struct net_device *dev, int mask)
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{
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struct arcnet_local *lp = netdev_priv(dev);
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void __iomem *ioaddr = lp->mem_start + 0x800;
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arcnet_writeb(mask, ioaddr, COM9026_REG_W_INTMASK);
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}
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static int arcrimi_status(struct net_device *dev)
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{
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struct arcnet_local *lp = netdev_priv(dev);
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void __iomem *ioaddr = lp->mem_start + 0x800;
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return arcnet_readb(ioaddr, COM9026_REG_R_STATUS);
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}
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static void arcrimi_command(struct net_device *dev, int cmd)
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{
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struct arcnet_local *lp = netdev_priv(dev);
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void __iomem *ioaddr = lp->mem_start + 0x800;
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arcnet_writeb(cmd, ioaddr, COM9026_REG_W_COMMAND);
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}
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static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset,
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void *buf, int count)
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{
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struct arcnet_local *lp = netdev_priv(dev);
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void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset;
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TIME(dev, "memcpy_toio", count, memcpy_toio(memaddr, buf, count));
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}
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static void arcrimi_copy_from_card(struct net_device *dev, int bufnum,
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int offset, void *buf, int count)
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{
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struct arcnet_local *lp = netdev_priv(dev);
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void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset;
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TIME(dev, "memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
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}
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static int node;
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static int io; /* use the insmod io= irq= node= options */
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static int irq;
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static char device[9]; /* use eg. device=arc1 to change name */
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module_param(node, int, 0);
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module_param(io, int, 0);
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module_param(irq, int, 0);
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module_param_string(device, device, sizeof(device), 0);
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MODULE_LICENSE("GPL");
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static struct net_device *my_dev;
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static int __init arc_rimi_init(void)
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{
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struct net_device *dev;
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dev = alloc_arcdev(device);
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if (!dev)
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return -ENOMEM;
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if (node && node != 0xff)
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dev->dev_addr[0] = node;
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dev->mem_start = io;
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dev->irq = irq;
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if (dev->irq == 2)
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dev->irq = 9;
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if (arcrimi_probe(dev)) {
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free_netdev(dev);
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return -EIO;
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}
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my_dev = dev;
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return 0;
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}
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static void __exit arc_rimi_exit(void)
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{
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struct net_device *dev = my_dev;
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struct arcnet_local *lp = netdev_priv(dev);
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unregister_netdev(dev);
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iounmap(lp->mem_start);
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release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
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free_irq(dev->irq, dev);
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free_netdev(dev);
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}
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#ifndef MODULE
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static int __init arcrimi_setup(char *s)
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{
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int ints[8];
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s = get_options(s, 8, ints);
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if (!ints[0])
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return 1;
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switch (ints[0]) {
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default: /* ERROR */
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pr_err("Too many arguments\n");
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fallthrough;
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case 3: /* Node ID */
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node = ints[3];
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fallthrough;
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case 2: /* IRQ */
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irq = ints[2];
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fallthrough;
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case 1: /* IO address */
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io = ints[1];
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}
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if (*s)
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snprintf(device, sizeof(device), "%s", s);
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return 1;
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}
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__setup("arcrimi=", arcrimi_setup);
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#endif /* MODULE */
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module_init(arc_rimi_init)
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module_exit(arc_rimi_exit)
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