- 根目录:
- drivers
- net
- wan
- cycx_main.c
/*
* cycx_main.c Cyclades Cyclom 2X WAN Link Driver. Main module.
*
* Author: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
*
* Copyright: (c) 1998-2003 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.
* ============================================================================
* Please look at the bitkeeper changelog (or any other scm tool that ends up
* importing bitkeeper changelog or that replaces bitkeeper in the future as
* main tool for linux development).
*
* 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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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/wanrouter.h> /* WAN router definitions */
#include <linux/cyclomx.h> /* cyclomx common user API definitions */
#include <linux/init.h> /* __init (when not using as a module) */
#include <linux/interrupt.h>
unsigned int cycx_debug;
MODULE_AUTHOR("Arnaldo Carvalho de Melo");
MODULE_DESCRIPTION("Cyclom 2X Sync Card Driver.");
MODULE_LICENSE("GPL");
module_param(cycx_debug, int, 0);
MODULE_PARM_DESC(cycx_debug, "cyclomx debug level");
/* Defines & Macros */
#define CYCX_DRV_VERSION 0 /* version number */
#define CYCX_DRV_RELEASE 11 /* release (minor version) number */
#define CYCX_MAX_CARDS 1 /* max number of adapters */
#define CONFIG_CYCX_CARDS 1
/* Function Prototypes */
/* WAN link driver entry points */
static int cycx_wan_setup(struct wan_device *wandev, wandev_conf_t *conf);
static int cycx_wan_shutdown(struct wan_device *wandev);
/* Miscellaneous functions */
static irqreturn_t cycx_isr(int irq, void *dev_id);
/* Global Data
* Note: All data must be explicitly initialized!!!
*/
/* private data */
static const char cycx_drvname[] = "cyclomx";
static const char cycx_fullname[] = "CYCLOM 2X(tm) Sync Card Driver";
static const char cycx_copyright[] = "(c) 1998-2003 Arnaldo Carvalho de Melo "
"<acme@conectiva.com.br>";
static int cycx_ncards = CONFIG_CYCX_CARDS;
static struct cycx_device *cycx_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
*/
static int __init cycx_init(void)
{
int cnt, err = -ENOMEM;
pr_info("%s v%u.%u %s\n",
cycx_fullname, CYCX_DRV_VERSION, CYCX_DRV_RELEASE,
cycx_copyright);
/* Verify number of cards and allocate adapter data space */
cycx_ncards = min_t(int, cycx_ncards, CYCX_MAX_CARDS);
cycx_ncards = max_t(int, cycx_ncards, 1);
cycx_card_array = kcalloc(cycx_ncards, sizeof(struct cycx_device), GFP_KERNEL);
if (!cycx_card_array)
goto out;
/* Register adapters with WAN router */
for (cnt = 0; cnt < cycx_ncards; ++cnt) {
struct cycx_device *card = &cycx_card_array[cnt];
struct wan_device *wandev = &card->wandev;
sprintf(card->devname, "%s%d", cycx_drvname, cnt + 1);
wandev->magic = ROUTER_MAGIC;
wandev->name = card->devname;
wandev->private = card;
wandev->setup = cycx_wan_setup;
wandev->shutdown = cycx_wan_shutdown;
err = register_wan_device(wandev);
if (err) {
pr_err("%s registration failed with error %d!\n",
card->devname, err);
break;
}
}
err = -ENODEV;
if (!cnt) {
kfree(cycx_card_array);
goto out;
}
err = 0;
cycx_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 cycx_exit(void)
{
int i = 0;
for (; i < cycx_ncards; ++i) {
struct cycx_device *card = &cycx_card_array[i];
unregister_wan_device(card->devname);
}
kfree(cycx_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 cycx_wan_setup(struct wan_device *wandev, wandev_conf_t *conf)
{
int rc = -EFAULT;
struct cycx_device *card;
int irq;
/* Sanity checks */
if (!wandev || !wandev->private || !conf)
goto out;
card = wandev->private;
rc = -EBUSY;
if (wandev->state != WAN_UNCONFIGURED)
goto out;
rc = -EINVAL;
if (!conf->data_size || !conf->data) {
pr_err("%s: firmware not found in configuration data!\n",
wandev->name);
goto out;
}
if (conf->irq <= 0) {
pr_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)) {
pr_err("%s: can't reserve IRQ %d!\n", wandev->name, irq);
goto out;
}
/* Configure hardware, load firmware, etc. */
memset(&card->hw, 0, sizeof(card->hw));
card->hw.irq = irq;
card->hw.dpmsize = CYCX_WINDOWSIZE;
card->hw.fwid = CFID_X25_2X;
spin_lock_init(&card->lock);
init_waitqueue_head(&card->wait_stats);
rc = cycx_setup(&card->hw, conf->data, conf->data_size, conf->maddr);
if (rc)
goto out_irq;
/* Initialize WAN device data space */
wandev->irq = irq;
wandev->dma = wandev->ioport = 0;
wandev->maddr = (unsigned long)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:
rc = cycx_x25_wan_init(card, conf);
break;
#endif
default:
pr_err("%s: this firmware is not supported!\n", wandev->name);
rc = -EINVAL;
}
if (rc) {
cycx_down(&card->hw);
goto out_irq;
}
rc = 0;
out:
return rc;
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 cycx_wan_shutdown(struct wan_device *wandev)
{
int ret = -EFAULT;
struct cycx_device *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);
pr_info("%s: irq %d being freed!\n", wandev->name, wandev->irq);
free_irq(wandev->irq, card);
out: return ret;
}
/* Miscellaneous */
/*
* Cyclom 2X Interrupt Service Routine.
* o acknowledge Cyclom 2X hardware interrupt.
* o call protocol-specific interrupt service routine, if any.
*/
static irqreturn_t cycx_isr(int irq, void *dev_id)
{
struct cycx_device *card = dev_id;
if (card->wandev.state == WAN_UNCONFIGURED)
goto out;
if (card->in_isr) {
pr_warn("%s: interrupt re-entrancy on IRQ %d!\n",
card->devname, card->wandev.irq);
goto out;
}
if (card->isr)
card->isr(card);
return IRQ_HANDLED;
out:
return IRQ_NONE;
}
/* Set WAN device state. */
void cycx_set_state(struct cycx_device *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;
}
pr_info("%s: link %s\n", card->devname, string_state);
card->wandev.state = state;
}
card->state_tick = jiffies;
spin_unlock_irqrestore(&card->lock, flags);
}
module_init(cycx_init);
module_exit(cycx_exit);