cycx_main.c
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- /*
- * cycx_main.c Cyclades Cyclom 2X WAN Link Driver. Main module.
- *
- * Author: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
- *
- * Copyright: (c) 1998-2001 Arnaldo Carvalho de Melo
- *
- * Based on sdlamain.c by Gene Kozin <genek@compuserve.com> &
- * Jaspreet Singh <jaspreet@sangoma.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- * ============================================================================
- * 2001/05/09 acme Fix MODULE_DESC for debug, .bss nitpicks,
- * some cleanups
- * 2000/07/13 acme remove useless #ifdef MODULE and crap
- * #if KERNEL_VERSION > blah
- * 2000/07/06 acme __exit at cyclomx_cleanup
- * 2000/04/02 acme dprintk and cycx_debug
- * module_init/module_exit
- * 2000/01/21 acme rename cyclomx_open to cyclomx_mod_inc_use_count
- * and cyclomx_close to cyclomx_mod_dec_use_count
- * 2000/01/08 acme cleanup
- * 1999/11/06 acme cycx_down back to life (it needs to be
- * called to iounmap the dpmbase)
- * 1999/08/09 acme removed references to enable_tx_int
- * use spinlocks instead of cli/sti in
- * cyclomx_set_state
- * 1999/05/19 acme works directly linked into the kernel
- * init_waitqueue_head for 2.3.* kernel
- * 1999/05/18 acme major cleanup (polling not needed), etc
- * 1998/08/28 acme minor cleanup (ioctls for firmware deleted)
- * queue_task activated
- * 1998/08/08 acme Initial version.
- */
- #include <linux/config.h> /* OS configuration options */
- #include <linux/stddef.h> /* offsetof(), etc. */
- #include <linux/errno.h> /* return codes */
- #include <linux/string.h> /* inline memset(), etc. */
- #include <linux/slab.h> /* kmalloc(), kfree() */
- #include <linux/kernel.h> /* printk(), and other useful stuff */
- #include <linux/module.h> /* support for loadable modules */
- #include <linux/ioport.h> /* request_region(), release_region() */
- #include <linux/tqueue.h> /* for kernel task queues */
- #include <linux/wanrouter.h> /* WAN router definitions */
- #include <linux/cyclomx.h> /* cyclomx common user API definitions */
- #include <asm/uaccess.h> /* kernel <-> user copy */
- #include <linux/init.h> /* __init (when not using as a module) */
- /* Debug */
- unsigned int cycx_debug;
- MODULE_AUTHOR("Arnaldo Carvalho de Melo");
- MODULE_DESCRIPTION("Cyclom 2X Sync Card Driver.");
- MODULE_LICENSE("GPL");
- MODULE_PARM(cycx_debug, "i");
- MODULE_PARM_DESC(cycx_debug, "cyclomx debug level");
- /* Defines & Macros */
- #define DRV_VERSION 0 /* version number */
- #define DRV_RELEASE 10 /* release (minor version) number */
- #define MAX_CARDS 1 /* max number of adapters */
- #define CONFIG_CYCLOMX_CARDS 1
- /* Function Prototypes */
- /* WAN link driver entry points */
- static int setup (wan_device_t *wandev, wandev_conf_t *conf);
- static int shutdown (wan_device_t *wandev);
- static int ioctl (wan_device_t *wandev, unsigned cmd, unsigned long arg);
- /* Miscellaneous functions */
- static void cycx_isr (int irq, void *dev_id, struct pt_regs *regs);
- /* Global Data
- * Note: All data must be explicitly initialized!!!
- */
- /* private data */
- static char drvname[] = "cyclomx";
- static char fullname[] = "CYCLOM 2X(tm) Sync Card Driver";
- static char copyright[] = "(c) 1998-2001 Arnaldo Carvalho de Melo "
- "<acme@conectiva.com.br>";
- static int ncards = CONFIG_CYCLOMX_CARDS;
- static cycx_t *card_array; /* adapter data space */
- /* Kernel Loadable Module Entry Points */
- /*
- * Module 'insert' entry point.
- * o print announcement
- * o allocate adapter data space
- * o initialize static data
- * o register all cards with WAN router
- * o calibrate Cyclom 2X shared memory access delay.
- *
- * Return: 0 Ok
- * < 0 error.
- * Context: process
- */
- int __init cyclomx_init (void)
- {
- int cnt, err = -ENOMEM;
- printk(KERN_INFO "%s v%u.%u %sn",
- fullname, DRV_VERSION, DRV_RELEASE, copyright);
- /* Verify number of cards and allocate adapter data space */
- ncards = min_t(int, ncards, MAX_CARDS);
- ncards = max_t(int, ncards, 1);
- card_array = kmalloc(sizeof(cycx_t) * ncards, GFP_KERNEL);
- if (!card_array)
- goto out;
- memset(card_array, 0, sizeof(cycx_t) * ncards);
- /* Register adapters with WAN router */
- for (cnt = 0; cnt < ncards; ++cnt) {
- cycx_t *card = &card_array[cnt];
- wan_device_t *wandev = &card->wandev;
- sprintf(card->devname, "%s%d", drvname, cnt + 1);
- wandev->magic = ROUTER_MAGIC;
- wandev->name = card->devname;
- wandev->private = card;
- wandev->setup = setup;
- wandev->shutdown = shutdown;
- wandev->ioctl = ioctl;
- err = register_wan_device(wandev);
- if (err) {
- printk(KERN_ERR "%s: %s registration failed with "
- "error %d!n",
- drvname, card->devname, err);
- break;
- }
- }
- err = -ENODEV;
- if (!cnt) {
- kfree(card_array);
- goto out;
- }
- err = 0;
- ncards = cnt; /* adjust actual number of cards */
- out: return err;
- }
- /*
- * Module 'remove' entry point.
- * o unregister all adapters from the WAN router
- * o release all remaining system resources
- */
- static void __exit cyclomx_cleanup (void)
- {
- int i = 0;
- for (; i < ncards; ++i) {
- cycx_t *card = &card_array[i];
- unregister_wan_device(card->devname);
- }
- kfree(card_array);
- }
- /* WAN Device Driver Entry Points */
- /*
- * Setup/configure WAN link driver.
- * o check adapter state
- * o make sure firmware is present in configuration
- * o allocate interrupt vector
- * o setup Cyclom 2X hardware
- * o call appropriate routine to perform protocol-specific initialization
- *
- * This function is called when router handles ROUTER_SETUP IOCTL. The
- * configuration structure is in kernel memory (including extended data, if
- * any).
- */
- static int setup (wan_device_t *wandev, wandev_conf_t *conf)
- {
- int err = -EFAULT;
- cycx_t *card;
- int irq;
- /* Sanity checks */
-
- if (!wandev || !wandev->private || !conf)
- goto out;
- card = wandev->private;
- err = -EBUSY;
- if (wandev->state != WAN_UNCONFIGURED)
- goto out;
- err = -EINVAL;
- if (!conf->data_size || !conf->data) {
- printk(KERN_ERR "%s: firmware not found in configuration "
- "data!n", wandev->name);
- goto out;
- }
- if (conf->irq <= 0) {
- printk(KERN_ERR "%s: can't configure without IRQ!n",
- wandev->name);
- goto out;
- }
- /* Allocate IRQ */
- irq = conf->irq == 2 ? 9 : conf->irq; /* IRQ2 -> IRQ9 */
- if (request_irq(irq, cycx_isr, 0, wandev->name, card)) {
- printk(KERN_ERR "%s: can't reserve IRQ %d!n",
- wandev->name, irq);
- goto out;
- }
- /* Configure hardware, load firmware, etc. */
- memset(&card->hw, 0, sizeof(cycxhw_t));
- card->hw.irq = irq;
- card->hw.dpmbase = conf->maddr;
- card->hw.dpmsize = CYCX_WINDOWSIZE;
- card->hw.fwid = CFID_X25_2X;
- card->lock = SPIN_LOCK_UNLOCKED;
- init_waitqueue_head(&card->wait_stats);
- err = cycx_setup(&card->hw, conf->data, conf->data_size);
- if (err)
- goto out_irq;
- /* Initialize WAN device data space */
- wandev->irq = irq;
- wandev->dma = wandev->ioport = 0;
- wandev->maddr = card->hw.dpmbase;
- wandev->msize = card->hw.dpmsize;
- wandev->hw_opt[2] = 0;
- wandev->hw_opt[3] = card->hw.fwid;
- /* Protocol-specific initialization */
- switch (card->hw.fwid) {
- #ifdef CONFIG_CYCLOMX_X25
- case CFID_X25_2X:
- err = cyx_init(card, conf);
- break;
- #endif
- default:
- printk(KERN_ERR "%s: this firmware is not supported!n",
- wandev->name);
- err = -EINVAL;
- }
- if (err) {
- cycx_down(&card->hw);
- goto out_irq;
- }
- err = 0;
- out: return err;
- out_irq:
- free_irq(irq, card);
- goto out;
- }
- /*
- * Shut down WAN link driver.
- * o shut down adapter hardware
- * o release system resources.
- *
- * This function is called by the router when device is being unregistered or
- * when it handles ROUTER_DOWN IOCTL.
- */
- static int shutdown (wan_device_t *wandev)
- {
- int ret = -EFAULT;
- cycx_t *card;
- /* sanity checks */
- if (!wandev || !wandev->private)
- goto out;
- ret = 0;
- if (wandev->state == WAN_UNCONFIGURED)
- goto out;
- card = wandev->private;
- wandev->state = WAN_UNCONFIGURED;
- cycx_down(&card->hw);
- printk(KERN_INFO "%s: irq %d being freed!n", wandev->name,
- wandev->irq);
- free_irq(wandev->irq, card);
- out: return ret;
- }
- /*
- * Driver I/O control.
- * o verify arguments
- * o perform requested action
- *
- * This function is called when router handles one of the reserved user
- * IOCTLs. Note that 'arg' still points to user address space.
- *
- * no reserved ioctls for the cyclom 2x up to now
- */
- static int ioctl (wan_device_t *wandev, unsigned cmd, unsigned long arg)
- {
- return -EINVAL;
- }
- /* Miscellaneous */
- /*
- * Cyclom 2X Interrupt Service Routine.
- * o acknowledge Cyclom 2X hardware interrupt.
- * o call protocol-specific interrupt service routine, if any.
- */
- static void cycx_isr (int irq, void *dev_id, struct pt_regs *regs)
- {
- cycx_t *card = (cycx_t *)dev_id;
- if (!card || card->wandev.state == WAN_UNCONFIGURED)
- goto out;
- if (card->in_isr) {
- printk(KERN_WARNING "%s: interrupt re-entrancy on IRQ %d!n",
- card->devname, card->wandev.irq);
- goto out;
- }
- if (card->isr)
- card->isr(card);
- out: return;
- }
- /*
- * This routine is called by the protocol-specific modules when network
- * interface is being open. The only reason we need this, is because we
- * have to call MOD_INC_USE_COUNT, but cannot include 'module.h' where it's
- * defined more than once into the same kernel module.
- */
- void cyclomx_mod_inc_use_count (cycx_t *card)
- {
- ++card->open_cnt;
- MOD_INC_USE_COUNT;
- }
- /*
- * This routine is called by the protocol-specific modules when network
- * interface is being closed. The only reason we need this, is because we
- * have to call MOD_DEC_USE_COUNT, but cannot include 'module.h' where it's
- * defined more than once into the same kernel module.
- */
- void cyclomx_mod_dec_use_count (cycx_t *card)
- {
- --card->open_cnt;
- MOD_DEC_USE_COUNT;
- }
- /* Set WAN device state. */
- void cyclomx_set_state (cycx_t *card, int state)
- {
- unsigned long flags;
- char *string_state = NULL;
- spin_lock_irqsave(&card->lock, flags);
- if (card->wandev.state != state) {
- switch (state) {
- case WAN_CONNECTED:
- string_state = "connected!";
- break;
- case WAN_DISCONNECTED:
- string_state = "disconnected!";
- break;
- }
- printk(KERN_INFO "%s: link %sn", card->devname, string_state);
- card->wandev.state = state;
- }
- card->state_tick = jiffies;
- spin_unlock_irqrestore(&card->lock, flags);
- }
- module_init(cyclomx_init);
- module_exit(cyclomx_cleanup);