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![Jakub Kicinski](/assets/img/avatar_default.png)
Make the drivers which use single-byte netdev addresses (netdev->addr_len == 1) use the appropriate address setting helpers. arcnet copies from int variables and io reads a lot, so add a helper for arcnet drivers to use. Similar helper could be reused for phonet and appletalk but there isn't any good central location where we could put it, and netdevice.h is already very crowded. Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> # for HSI Link: https://lore.kernel.org/r/20211012142757.4124842-1-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
385 lines
10 KiB
C
385 lines
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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arcnet_set_addr(dev, arcnet_readb(lp->mem_start,
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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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arcnet_set_addr(dev, 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_arcdev(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_arcdev(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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