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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 %s\n",
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 %s\n", 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);
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