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WSL2-Linux-Kernel/drivers/net/wan/sdlamain.c

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C
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/****************************************************************************
* sdlamain.c WANPIPE(tm) Multiprotocol WAN Link Driver. Main module.
*
* Author: Nenad Corbic <ncorbic@sangoma.com>
* Gideon Hack
*
* Copyright: (c) 1995-2000 Sangoma Technologies Inc.
*
* 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.
* ============================================================================
* Dec 22, 2000 Nenad Corbic Updated for 2.4.X kernels.
* Removed the polling routine.
* Nov 13, 2000 Nenad Corbic Added hw probing on module load and dynamic
* device allocation.
* Nov 7, 2000 Nenad Corbic Fixed the Multi-Port PPP for kernels
* 2.2.16 and above.
* Aug 2, 2000 Nenad Corbic Block the Multi-Port PPP from running on
* kernels 2.2.16 or greater. The SyncPPP
* has changed.
* Jul 25, 2000 Nenad Corbic Updated the Piggiback support for MultPPPP.
* Jul 13, 2000 Nenad Corbic Added Multi-PPP support.
* Feb 02, 2000 Nenad Corbic Fixed up piggyback probing and selection.
* Sep 23, 1999 Nenad Corbic Added support for SMP
* Sep 13, 1999 Nenad Corbic Each port is treated as a separate device.
* Jun 02, 1999 Gideon Hack Added support for the S514 adapter.
* Updates for Linux 2.2.X kernels.
* Sep 17, 1998 Jaspreet Singh Updated for 2.1.121+ kernel
* Nov 28, 1997 Jaspreet Singh Changed DRV_RELEASE to 1
* Nov 10, 1997 Jaspreet Singh Changed sti() to restore_flags();
* Nov 06, 1997 Jaspreet Singh Changed DRV_VERSION to 4 and DRV_RELEASE to 0
* Oct 20, 1997 Jaspreet Singh Modified sdla_isr routine so that card->in_isr
* assignments are taken out and placed in the
* sdla_ppp.c, sdla_fr.c and sdla_x25.c isr
* routines. Took out 'wandev->tx_int_enabled' and
* replaced it with 'wandev->enable_tx_int'.
* May 29, 1997 Jaspreet Singh Flow Control Problem
* added "wandev->tx_int_enabled=1" line in the
* init module. This line initializes the flag for
* preventing Interrupt disabled with device set to
* busy
* Jan 15, 1997 Gene Kozin Version 3.1.0
* o added UDP management stuff
* Jan 02, 1997 Gene Kozin 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/init.h>
#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/wanpipe.h> /* WANPIPE common user API definitions */
#include <linux/rcupdate.h>
#include <linux/in.h>
#include <asm/io.h> /* phys_to_virt() */
#include <linux/pci.h>
#include <linux/sdlapci.h>
#include <linux/if_wanpipe_common.h>
#include <asm/uaccess.h> /* kernel <-> user copy */
#include <linux/inetdevice.h>
#include <linux/ip.h>
#include <net/route.h>
#define KMEM_SAFETYZONE 8
#ifndef CONFIG_WANPIPE_FR
#define wpf_init(a,b) (-EPROTONOSUPPORT)
#endif
#ifndef CONFIG_WANPIPE_CHDLC
#define wpc_init(a,b) (-EPROTONOSUPPORT)
#endif
#ifndef CONFIG_WANPIPE_X25
#define wpx_init(a,b) (-EPROTONOSUPPORT)
#endif
#ifndef CONFIG_WANPIPE_PPP
#define wpp_init(a,b) (-EPROTONOSUPPORT)
#endif
#ifndef CONFIG_WANPIPE_MULTPPP
#define wsppp_init(a,b) (-EPROTONOSUPPORT)
#endif
/***********FOR DEBUGGING PURPOSES*********************************************
static void * dbg_kmalloc(unsigned int size, int prio, int line) {
int i = 0;
void * v = kmalloc(size+sizeof(unsigned int)+2*KMEM_SAFETYZONE*8,prio);
char * c1 = v;
c1 += sizeof(unsigned int);
*((unsigned int *)v) = size;
for (i = 0; i < KMEM_SAFETYZONE; i++) {
c1[0] = 'D'; c1[1] = 'E'; c1[2] = 'A'; c1[3] = 'D';
c1[4] = 'B'; c1[5] = 'E'; c1[6] = 'E'; c1[7] = 'F';
c1 += 8;
}
c1 += size;
for (i = 0; i < KMEM_SAFETYZONE; i++) {
c1[0] = 'M'; c1[1] = 'U'; c1[2] = 'N'; c1[3] = 'G';
c1[4] = 'W'; c1[5] = 'A'; c1[6] = 'L'; c1[7] = 'L';
c1 += 8;
}
v = ((char *)v) + sizeof(unsigned int) + KMEM_SAFETYZONE*8;
printk(KERN_INFO "line %d kmalloc(%d,%d) = %p\n",line,size,prio,v);
return v;
}
static void dbg_kfree(void * v, int line) {
unsigned int * sp = (unsigned int *)(((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8));
unsigned int size = *sp;
char * c1 = ((char *)v) - KMEM_SAFETYZONE*8;
int i = 0;
for (i = 0; i < KMEM_SAFETYZONE; i++) {
if ( c1[0] != 'D' || c1[1] != 'E' || c1[2] != 'A' || c1[3] != 'D'
|| c1[4] != 'B' || c1[5] != 'E' || c1[6] != 'E' || c1[7] != 'F') {
printk(KERN_INFO "kmalloced block at %p has been corrupted (underrun)!\n",v);
printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
}
c1 += 8;
}
c1 += size;
for (i = 0; i < KMEM_SAFETYZONE; i++) {
if ( c1[0] != 'M' || c1[1] != 'U' || c1[2] != 'N' || c1[3] != 'G'
|| c1[4] != 'W' || c1[5] != 'A' || c1[6] != 'L' || c1[7] != 'L'
) {
printk(KERN_INFO "kmalloced block at %p has been corrupted (overrun):\n",v);
printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
}
c1 += 8;
}
printk(KERN_INFO "line %d kfree(%p)\n",line,v);
v = ((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8);
kfree(v);
}
#define kmalloc(x,y) dbg_kmalloc(x,y,__LINE__)
#define kfree(x) dbg_kfree(x,__LINE__)
******************************************************************************/
/****** Defines & Macros ****************************************************/
#ifdef _DEBUG_
#define STATIC
#else
#define STATIC static
#endif
#define DRV_VERSION 5 /* version number */
#define DRV_RELEASE 0 /* release (minor version) number */
#define MAX_CARDS 16 /* max number of adapters */
#ifndef CONFIG_WANPIPE_CARDS /* configurable option */
#define CONFIG_WANPIPE_CARDS 1
#endif
#define CMD_OK 0 /* normal firmware return code */
#define CMD_TIMEOUT 0xFF /* firmware command timed out */
#define MAX_CMD_RETRY 10 /* max number of firmware retries */
/****** Function Prototypes *************************************************/
extern void disable_irq(unsigned int);
extern void enable_irq(unsigned int);
/* WAN link driver entry points */
static int setup(struct wan_device* wandev, wandev_conf_t* conf);
static int shutdown(struct wan_device* wandev);
static int ioctl(struct wan_device* wandev, unsigned cmd, unsigned long arg);
/* IOCTL handlers */
static int ioctl_dump (sdla_t* card, sdla_dump_t* u_dump);
static int ioctl_exec (sdla_t* card, sdla_exec_t* u_exec, int);
/* Miscellaneous functions */
STATIC irqreturn_t sdla_isr (int irq, void* dev_id, struct pt_regs *regs);
static void release_hw (sdla_t *card);
static int check_s508_conflicts (sdla_t* card,wandev_conf_t* conf, int*);
static int check_s514_conflicts (sdla_t* card,wandev_conf_t* conf, int*);
/****** Global Data **********************************************************
* Note: All data must be explicitly initialized!!!
*/
/* private data */
static char drvname[] = "wanpipe";
static char fullname[] = "WANPIPE(tm) Multiprotocol Driver";
static char copyright[] = "(c) 1995-2000 Sangoma Technologies Inc.";
static int ncards;
static sdla_t* card_array; /* adapter data space */
/* Wanpipe's own workqueue, used for all API's.
* All protocol specific tasks will be inserted
* into the "wanpipe_wq" workqueue.
* The kernel workqueue mechanism will execute
* all pending tasks in the "wanpipe_wq" workqueue.
*/
struct workqueue_struct *wanpipe_wq;
DECLARE_WORK(wanpipe_work, NULL, NULL);
static int wanpipe_bh_critical;
/******* 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 SDLA shared memory access delay.
*
* Return: 0 Ok
* < 0 error.
* Context: process
*/
static int __init wanpipe_init(void)
{
int cnt, err = 0;
printk(KERN_INFO "%s v%u.%u %s\n",
fullname, DRV_VERSION, DRV_RELEASE, copyright);
wanpipe_wq = create_workqueue("wanpipe_wq");
if (!wanpipe_wq)
return -ENOMEM;
/* Probe for wanpipe cards and return the number found */
printk(KERN_INFO "wanpipe: Probing for WANPIPE hardware.\n");
ncards = wanpipe_hw_probe();
if (ncards){
printk(KERN_INFO "wanpipe: Allocating maximum %i devices: wanpipe%i - wanpipe%i.\n",ncards,1,ncards);
}else{
printk(KERN_INFO "wanpipe: No S514/S508 cards found, unloading modules!\n");
destroy_workqueue(wanpipe_wq);
return -ENODEV;
}
/* Verify number of cards and allocate adapter data space */
card_array = kmalloc(sizeof(sdla_t) * ncards, GFP_KERNEL);
if (card_array == NULL) {
destroy_workqueue(wanpipe_wq);
return -ENOMEM;
}
memset(card_array, 0, sizeof(sdla_t) * ncards);
/* Register adapters with WAN router */
for (cnt = 0; cnt < ncards; ++ cnt) {
sdla_t* card = &card_array[cnt];
struct wan_device* wandev = &card->wandev;
card->next = NULL;
sprintf(card->devname, "%s%d", drvname, cnt + 1);
wandev->magic = ROUTER_MAGIC;
wandev->name = card->devname;
wandev->private = card;
wandev->enable_tx_int = 0;
wandev->setup = &setup;
wandev->shutdown = &shutdown;
wandev->ioctl = &ioctl;
err = register_wan_device(wandev);
if (err) {
printk(KERN_INFO
"%s: %s registration failed with error %d!\n",
drvname, card->devname, err);
break;
}
}
if (cnt){
ncards = cnt; /* adjust actual number of cards */
}else {
kfree(card_array);
destroy_workqueue(wanpipe_wq);
printk(KERN_INFO "IN Init Module: NO Cards registered\n");
err = -ENODEV;
}
return err;
}
/*============================================================================
* Module 'remove' entry point.
* o unregister all adapters from the WAN router
* o release all remaining system resources
*/
static void __exit wanpipe_cleanup(void)
{
int i;
if (!ncards)
return;
for (i = 0; i < ncards; ++i) {
sdla_t* card = &card_array[i];
unregister_wan_device(card->devname);
}
destroy_workqueue(wanpipe_wq);
kfree(card_array);
printk(KERN_INFO "\nwanpipe: WANPIPE Modules Unloaded.\n");
}
module_init(wanpipe_init);
module_exit(wanpipe_cleanup);
/******* WAN Device Driver Entry Points *************************************/
/*============================================================================
* Setup/configure WAN link driver.
* o check adapter state
* o make sure firmware is present in configuration
* o make sure I/O port and IRQ are specified
* o make sure I/O region is available
* o allocate interrupt vector
* o setup SDLA hardware
* o call appropriate routine to perform protocol-specific initialization
* o mark I/O region as used
* o if this is the first active card, then schedule background task
*
* 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(struct wan_device* wandev, wandev_conf_t* conf)
{
sdla_t* card;
int err = 0;
int irq=0;
/* Sanity checks */
if ((wandev == NULL) || (wandev->private == NULL) || (conf == NULL)){
printk(KERN_INFO
"%s: Failed Sdlamain Setup wandev %u, card %u, conf %u !\n",
wandev->name,
(unsigned int)wandev,(unsigned int)wandev->private,
(unsigned int)conf);
return -EFAULT;
}
printk(KERN_INFO "%s: Starting WAN Setup\n", wandev->name);
card = wandev->private;
if (wandev->state != WAN_UNCONFIGURED){
printk(KERN_INFO "%s: failed sdlamain setup, busy!\n",
wandev->name);
return -EBUSY; /* already configured */
}
printk(KERN_INFO "\nProcessing WAN device %s...\n", wandev->name);
/* Initialize the counters for each wandev
* Used for counting number of times new_if and
* del_if get called.
*/
wandev->del_if_cnt = 0;
wandev->new_if_cnt = 0;
wandev->config_id = conf->config_id;
if (!conf->data_size || (conf->data == NULL)) {
printk(KERN_INFO
"%s: firmware not found in configuration data!\n",
wandev->name);
return -EINVAL;
}
/* Check for resource conflicts and setup the
* card for piggibacking if necessary */
if(!conf->S514_CPU_no[0]) {
if ((err=check_s508_conflicts(card,conf,&irq)) != 0){
return err;
}
}else {
if ((err=check_s514_conflicts(card,conf,&irq)) != 0){
return err;
}
}
/* If the current card has already been configured
* or it's a piggyback card, do not try to allocate
* resources.
*/
if (!card->wandev.piggyback && !card->configured){
/* Configure hardware, load firmware, etc. */
memset(&card->hw, 0, sizeof(sdlahw_t));
/* for an S514 adapter, pass the CPU number and the slot number read */
/* from 'router.conf' to the 'sdla_setup()' function via the 'port' */
/* parameter */
if (conf->S514_CPU_no[0]){
card->hw.S514_cpu_no[0] = conf->S514_CPU_no[0];
card->hw.S514_slot_no = conf->PCI_slot_no;
card->hw.auto_pci_cfg = conf->auto_pci_cfg;
if (card->hw.auto_pci_cfg == WANOPT_YES){
printk(KERN_INFO "%s: Setting CPU to %c and Slot to Auto\n",
card->devname, card->hw.S514_cpu_no[0]);
}else{
printk(KERN_INFO "%s: Setting CPU to %c and Slot to %i\n",
card->devname, card->hw.S514_cpu_no[0], card->hw.S514_slot_no);
}
}else{
/* 508 Card io port and irq initialization */
card->hw.port = conf->ioport;
card->hw.irq = (conf->irq == 9) ? 2 : conf->irq;
}
/* Compute the virtual address of the card in kernel space */
if(conf->maddr){
card->hw.dpmbase = phys_to_virt(conf->maddr);
}else{
card->hw.dpmbase = (void *)conf->maddr;
}
card->hw.dpmsize = SDLA_WINDOWSIZE;
/* set the adapter type if using an S514 adapter */
card->hw.type = (conf->S514_CPU_no[0]) ? SDLA_S514 : conf->hw_opt[0];
card->hw.pclk = conf->hw_opt[1];
err = sdla_setup(&card->hw, conf->data, conf->data_size);
if (err){
printk(KERN_INFO "%s: Hardware setup Failed %i\n",
card->devname,err);
return err;
}
if(card->hw.type != SDLA_S514)
irq = (conf->irq == 2) ? 9 : conf->irq; /* IRQ2 -> IRQ9 */
else
irq = card->hw.irq;
/* request an interrupt vector - note that interrupts may be shared */
/* when using the S514 PCI adapter */
if(request_irq(irq, sdla_isr,
(card->hw.type == SDLA_S514) ? SA_SHIRQ : 0,
wandev->name, card)){
printk(KERN_INFO "%s: Can't reserve IRQ %d!\n", wandev->name, irq);
return -EINVAL;
}
}else{
printk(KERN_INFO "%s: Card Configured %lu or Piggybacking %i!\n",
wandev->name,card->configured,card->wandev.piggyback);
}
if (!card->configured){
/* Initialize the Spin lock */
printk(KERN_INFO "%s: Initializing for SMP\n",wandev->name);
/* Piggyback spin lock has already been initialized,
* in check_s514/s508_conflicts() */
if (!card->wandev.piggyback){
spin_lock_init(&card->wandev.lock);
}
/* Intialize WAN device data space */
wandev->irq = irq;
wandev->dma = 0;
if(card->hw.type != SDLA_S514){
wandev->ioport = card->hw.port;
}else{
wandev->S514_cpu_no[0] = card->hw.S514_cpu_no[0];
wandev->S514_slot_no = card->hw.S514_slot_no;
}
wandev->maddr = (unsigned long)card->hw.dpmbase;
wandev->msize = card->hw.dpmsize;
wandev->hw_opt[0] = card->hw.type;
wandev->hw_opt[1] = card->hw.pclk;
wandev->hw_opt[2] = card->hw.memory;
wandev->hw_opt[3] = card->hw.fwid;
}
/* Protocol-specific initialization */
switch (card->hw.fwid) {
case SFID_X25_502:
case SFID_X25_508:
printk(KERN_INFO "%s: Starting X.25 Protocol Init.\n",
card->devname);
err = wpx_init(card, conf);
break;
case SFID_FR502:
case SFID_FR508:
printk(KERN_INFO "%s: Starting Frame Relay Protocol Init.\n",
card->devname);
err = wpf_init(card, conf);
break;
case SFID_PPP502:
case SFID_PPP508:
printk(KERN_INFO "%s: Starting PPP Protocol Init.\n",
card->devname);
err = wpp_init(card, conf);
break;
case SFID_CHDLC508:
case SFID_CHDLC514:
if (conf->ft1){
printk(KERN_INFO "%s: Starting FT1 CSU/DSU Config Driver.\n",
card->devname);
err = wpft1_init(card, conf);
break;
}else if (conf->config_id == WANCONFIG_MPPP){
printk(KERN_INFO "%s: Starting Multi-Port PPP Protocol Init.\n",
card->devname);
err = wsppp_init(card,conf);
break;
}else{
printk(KERN_INFO "%s: Starting CHDLC Protocol Init.\n",
card->devname);
err = wpc_init(card, conf);
break;
}
default:
printk(KERN_INFO "%s: Error, Firmware is not supported %X %X!\n",
wandev->name,card->hw.fwid,SFID_CHDLC508);
err = -EPROTONOSUPPORT;
}
if (err != 0){
if (err == -EPROTONOSUPPORT){
printk(KERN_INFO
"%s: Error, Protocol selected has not been compiled!\n",
card->devname);
printk(KERN_INFO
"%s: Re-configure the kernel and re-build the modules!\n",
card->devname);
}
release_hw(card);
wandev->state = WAN_UNCONFIGURED;
return err;
}
/* Reserve I/O region and schedule background task */
if(card->hw.type != SDLA_S514 && !card->wandev.piggyback)
if (!request_region(card->hw.port, card->hw.io_range,
wandev->name)) {
printk(KERN_WARNING "port 0x%04x busy\n", card->hw.port);
release_hw(card);
wandev->state = WAN_UNCONFIGURED;
return -EBUSY;
}
/* Only use the polling routine for the X25 protocol */
card->wandev.critical=0;
return 0;
}
/*==================================================================
* configure_s508_card
*
* For a S508 adapter, check for a possible configuration error in that
* we are loading an adapter in the same IO port as a previously loaded S508
* card.
*/
static int check_s508_conflicts (sdla_t* card,wandev_conf_t* conf, int *irq)
{
unsigned long smp_flags;
int i;
if (conf->ioport <= 0) {
printk(KERN_INFO
"%s: can't configure without I/O port address!\n",
card->wandev.name);
return -EINVAL;
}
if (conf->irq <= 0) {
printk(KERN_INFO "%s: can't configure without IRQ!\n",
card->wandev.name);
return -EINVAL;
}
if (test_bit(0,&card->configured))
return 0;
/* Check for already loaded card with the same IO port and IRQ
* If found, copy its hardware configuration and use its
* resources (i.e. piggybacking)
*/
for (i = 0; i < ncards; i++) {
sdla_t *nxt_card = &card_array[i];
/* Skip the current card ptr */
if (nxt_card == card)
continue;
/* Find a card that is already configured with the
* same IO Port */
if ((nxt_card->hw.type == SDLA_S508) &&
(nxt_card->hw.port == conf->ioport) &&
(nxt_card->next == NULL)){
/* We found a card the card that has same configuration
* as us. This means, that we must setup this card in
* piggibacking mode. However, only CHDLC and MPPP protocol
* support this setup */
if ((conf->config_id == WANCONFIG_CHDLC ||
conf->config_id == WANCONFIG_MPPP) &&
(nxt_card->wandev.config_id == WANCONFIG_CHDLC ||
nxt_card->wandev.config_id == WANCONFIG_MPPP)){
*irq = nxt_card->hw.irq;
memcpy(&card->hw, &nxt_card->hw, sizeof(sdlahw_t));
/* The master could already be running, we must
* set this as a critical area */
lock_adapter_irq(&nxt_card->wandev.lock, &smp_flags);
nxt_card->next = card;
card->next = nxt_card;
card->wandev.piggyback = WANOPT_YES;
/* We must initialise the piggiback spin lock here
* since isr will try to lock card->next if it
* exists */
spin_lock_init(&card->wandev.lock);
unlock_adapter_irq(&nxt_card->wandev.lock, &smp_flags);
break;
}else{
/* Trying to run piggibacking with a wrong protocol */
printk(KERN_INFO "%s: ERROR: Resource busy, ioport: 0x%x\n"
"%s: This protocol doesn't support\n"
"%s: multi-port operation!\n",
card->devname,nxt_card->hw.port,
card->devname,card->devname);
return -EEXIST;
}
}
}
/* Make sure I/O port region is available only if we are the
* master device. If we are running in piggybacking mode,
* we will use the resources of the master card. */
if (!card->wandev.piggyback) {
struct resource *rr =
request_region(conf->ioport, SDLA_MAXIORANGE, "sdlamain");
release_region(conf->ioport, SDLA_MAXIORANGE);
if (!rr) {
printk(KERN_INFO
"%s: I/O region 0x%X - 0x%X is in use!\n",
card->wandev.name, conf->ioport,
conf->ioport + SDLA_MAXIORANGE - 1);
return -EINVAL;
}
}
return 0;
}
/*==================================================================
* configure_s514_card
*
* For a S514 adapter, check for a possible configuration error in that
* we are loading an adapter in the same slot as a previously loaded S514
* card.
*/
static int check_s514_conflicts(sdla_t* card,wandev_conf_t* conf, int *irq)
{
unsigned long smp_flags;
int i;
if (test_bit(0,&card->configured))
return 0;
/* Check for already loaded card with the same IO port and IRQ
* If found, copy its hardware configuration and use its
* resources (i.e. piggybacking)
*/
for (i = 0; i < ncards; i ++) {
sdla_t* nxt_card = &card_array[i];
if(nxt_card == card)
continue;
if((nxt_card->hw.type == SDLA_S514) &&
(nxt_card->hw.S514_slot_no == conf->PCI_slot_no) &&
(nxt_card->hw.S514_cpu_no[0] == conf->S514_CPU_no[0])&&
(nxt_card->next == NULL)){
if ((conf->config_id == WANCONFIG_CHDLC ||
conf->config_id == WANCONFIG_MPPP) &&
(nxt_card->wandev.config_id == WANCONFIG_CHDLC ||
nxt_card->wandev.config_id == WANCONFIG_MPPP)){
*irq = nxt_card->hw.irq;
memcpy(&card->hw, &nxt_card->hw, sizeof(sdlahw_t));
/* The master could already be running, we must
* set this as a critical area */
lock_adapter_irq(&nxt_card->wandev.lock,&smp_flags);
nxt_card->next = card;
card->next = nxt_card;
card->wandev.piggyback = WANOPT_YES;
/* We must initialise the piggiback spin lock here
* since isr will try to lock card->next if it
* exists */
spin_lock_init(&card->wandev.lock);
unlock_adapter_irq(&nxt_card->wandev.lock,&smp_flags);
}else{
/* Trying to run piggibacking with a wrong protocol */
printk(KERN_INFO "%s: ERROR: Resource busy: CPU %c PCISLOT %i\n"
"%s: This protocol doesn't support\n"
"%s: multi-port operation!\n",
card->devname,
conf->S514_CPU_no[0],conf->PCI_slot_no,
card->devname,card->devname);
return -EEXIST;
}
}
}
return 0;
}
/*============================================================================
* 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(struct wan_device* wandev)
{
sdla_t *card;
int err=0;
/* sanity checks */
if ((wandev == NULL) || (wandev->private == NULL)){
return -EFAULT;
}
if (wandev->state == WAN_UNCONFIGURED){
return 0;
}
card = wandev->private;
if (card->tty_opt){
if (card->tty_open){
printk(KERN_INFO
"%s: Shutdown Failed: TTY is still open\n",
card->devname);
return -EBUSY;
}
}
wandev->state = WAN_UNCONFIGURED;
set_bit(PERI_CRIT,(void*)&wandev->critical);
/* In case of piggibacking, make sure that
* we never try to shutdown both devices at the same
* time, because they depend on one another */
if (card->disable_comm){
card->disable_comm(card);
}
/* Release Resources */
release_hw(card);
/* only free the allocated I/O range if not an S514 adapter */
if (wandev->hw_opt[0] != SDLA_S514 && !card->configured){
release_region(card->hw.port, card->hw.io_range);
}
if (!card->configured){
memset(&card->hw, 0, sizeof(sdlahw_t));
if (card->next){
memset(&card->next->hw, 0, sizeof(sdlahw_t));
}
}
clear_bit(PERI_CRIT,(void*)&wandev->critical);
return err;
}
static void release_hw (sdla_t *card)
{
sdla_t *nxt_card;
/* Check if next device exists */
if (card->next){
nxt_card = card->next;
/* If next device is down then release resources */
if (nxt_card->wandev.state == WAN_UNCONFIGURED){
if (card->wandev.piggyback){
/* If this device is piggyback then use
* information of the master device
*/
printk(KERN_INFO "%s: Piggyback shutting down\n",card->devname);
sdla_down(&card->next->hw);
free_irq(card->wandev.irq, card->next);
card->configured = 0;
card->next->configured = 0;
card->wandev.piggyback = 0;
}else{
/* Master device shutting down */
printk(KERN_INFO "%s: Master shutting down\n",card->devname);
sdla_down(&card->hw);
free_irq(card->wandev.irq, card);
card->configured = 0;
card->next->configured = 0;
}
}else{
printk(KERN_INFO "%s: Device still running %i\n",
nxt_card->devname,nxt_card->wandev.state);
card->configured = 1;
}
}else{
printk(KERN_INFO "%s: Master shutting down\n",card->devname);
sdla_down(&card->hw);
free_irq(card->wandev.irq, card);
card->configured = 0;
}
return;
}
/*============================================================================
* 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' stil points to user address space.
*/
static int ioctl(struct wan_device* wandev, unsigned cmd, unsigned long arg)
{
sdla_t* card;
int err;
/* sanity checks */
if ((wandev == NULL) || (wandev->private == NULL))
return -EFAULT;
if (wandev->state == WAN_UNCONFIGURED)
return -ENODEV;
card = wandev->private;
if(card->hw.type != SDLA_S514){
disable_irq(card->hw.irq);
}
if (test_bit(SEND_CRIT, (void*)&wandev->critical)) {
return -EAGAIN;
}
switch (cmd) {
case WANPIPE_DUMP:
err = ioctl_dump(wandev->private, (void*)arg);
break;
case WANPIPE_EXEC:
err = ioctl_exec(wandev->private, (void*)arg, cmd);
break;
default:
err = -EINVAL;
}
return err;
}
/****** Driver IOCTL Handlers ***********************************************/
/*============================================================================
* Dump adapter memory to user buffer.
* o verify request structure
* o copy request structure to kernel data space
* o verify length/offset
* o verify user buffer
* o copy adapter memory image to user buffer
*
* Note: when dumping memory, this routine switches curent dual-port memory
* vector, so care must be taken to avoid racing conditions.
*/
static int ioctl_dump (sdla_t* card, sdla_dump_t* u_dump)
{
sdla_dump_t dump;
unsigned winsize;
unsigned long oldvec; /* DPM window vector */
unsigned long smp_flags;
int err = 0;
if(copy_from_user((void*)&dump, (void*)u_dump, sizeof(sdla_dump_t)))
return -EFAULT;
if ((dump.magic != WANPIPE_MAGIC) ||
(dump.offset + dump.length > card->hw.memory))
return -EINVAL;
winsize = card->hw.dpmsize;
if(card->hw.type != SDLA_S514) {
lock_adapter_irq(&card->wandev.lock, &smp_flags);
oldvec = card->hw.vector;
while (dump.length) {
/* current offset */
unsigned pos = dump.offset % winsize;
/* current vector */
unsigned long vec = dump.offset - pos;
unsigned len = (dump.length > (winsize - pos)) ?
(winsize - pos) : dump.length;
/* relocate window */
if (sdla_mapmem(&card->hw, vec) != 0) {
err = -EIO;
break;
}
if(copy_to_user((void *)dump.ptr,
(u8 *)card->hw.dpmbase + pos, len)){
unlock_adapter_irq(&card->wandev.lock, &smp_flags);
return -EFAULT;
}
dump.length -= len;
dump.offset += len;
dump.ptr = (char*)dump.ptr + len;
}
sdla_mapmem(&card->hw, oldvec);/* restore DPM window position */
unlock_adapter_irq(&card->wandev.lock, &smp_flags);
}else {
if(copy_to_user((void *)dump.ptr,
(u8 *)card->hw.dpmbase + dump.offset, dump.length)){
return -EFAULT;
}
}
return err;
}
/*============================================================================
* Execute adapter firmware command.
* o verify request structure
* o copy request structure to kernel data space
* o call protocol-specific 'exec' function
*/
static int ioctl_exec (sdla_t* card, sdla_exec_t* u_exec, int cmd)
{
sdla_exec_t exec;
int err=0;
if (card->exec == NULL && cmd == WANPIPE_EXEC){
return -ENODEV;
}
if(copy_from_user((void*)&exec, (void*)u_exec, sizeof(sdla_exec_t)))
return -EFAULT;
if ((exec.magic != WANPIPE_MAGIC) || (exec.cmd == NULL))
return -EINVAL;
switch (cmd) {
case WANPIPE_EXEC:
err = card->exec(card, exec.cmd, exec.data);
break;
}
return err;
}
/******* Miscellaneous ******************************************************/
/*============================================================================
* SDLA Interrupt Service Routine.
* o acknowledge SDLA hardware interrupt.
* o call protocol-specific interrupt service routine, if any.
*/
STATIC irqreturn_t sdla_isr (int irq, void* dev_id, struct pt_regs *regs)
{
#define card ((sdla_t*)dev_id)
if(card->hw.type == SDLA_S514) { /* handle interrrupt on S514 */
u32 int_status;
unsigned char CPU_no = card->hw.S514_cpu_no[0];
unsigned char card_found_for_IRQ;
u8 IRQ_count = 0;
for(;;) {
read_S514_int_stat(&card->hw, &int_status);
/* check if the interrupt is for this device */
if(!((unsigned char)int_status &
(IRQ_CPU_A | IRQ_CPU_B)))
return IRQ_HANDLED;
/* if the IRQ is for both CPUs on the same adapter, */
/* then alter the interrupt status so as to handle */
/* one CPU at a time */
if(((unsigned char)int_status & (IRQ_CPU_A | IRQ_CPU_B))
== (IRQ_CPU_A | IRQ_CPU_B)) {
int_status &= (CPU_no == S514_CPU_A) ?
~IRQ_CPU_B : ~IRQ_CPU_A;
}
card_found_for_IRQ = 0;
/* check to see that the CPU number for this device */
/* corresponds to the interrupt status read */
switch (CPU_no) {
case S514_CPU_A:
if((unsigned char)int_status &
IRQ_CPU_A)
card_found_for_IRQ = 1;
break;
case S514_CPU_B:
if((unsigned char)int_status &
IRQ_CPU_B)
card_found_for_IRQ = 1;
break;
}
/* exit if the interrupt is for another CPU on the */
/* same IRQ */
if(!card_found_for_IRQ)
return IRQ_HANDLED;
if (!card ||
(card->wandev.state == WAN_UNCONFIGURED && !card->configured)){
printk(KERN_INFO
"Received IRQ %d for CPU #%c\n",
irq, CPU_no);
printk(KERN_INFO
"IRQ for unconfigured adapter\n");
S514_intack(&card->hw, int_status);
return IRQ_HANDLED;
}
if (card->in_isr) {
printk(KERN_INFO
"%s: interrupt re-entrancy on IRQ %d\n",
card->devname, card->wandev.irq);
S514_intack(&card->hw, int_status);
return IRQ_HANDLED;
}
spin_lock(&card->wandev.lock);
if (card->next){
spin_lock(&card->next->wandev.lock);
}
S514_intack(&card->hw, int_status);
if (card->isr)
card->isr(card);
if (card->next){
spin_unlock(&card->next->wandev.lock);
}
spin_unlock(&card->wandev.lock);
/* handle a maximum of two interrupts (one for each */
/* CPU on the adapter) before returning */
if((++ IRQ_count) == 2)
return IRQ_HANDLED;
}
}
else { /* handle interrupt on S508 adapter */
if (!card || ((card->wandev.state == WAN_UNCONFIGURED) && !card->configured))
return IRQ_HANDLED;
if (card->in_isr) {
printk(KERN_INFO
"%s: interrupt re-entrancy on IRQ %d!\n",
card->devname, card->wandev.irq);
return IRQ_HANDLED;
}
spin_lock(&card->wandev.lock);
if (card->next){
spin_lock(&card->next->wandev.lock);
}
sdla_intack(&card->hw);
if (card->isr)
card->isr(card);
if (card->next){
spin_unlock(&card->next->wandev.lock);
}
spin_unlock(&card->wandev.lock);
}
return IRQ_HANDLED;
#undef card
}
/*============================================================================
* 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 wanpipe_open (sdla_t* card)
{
++card->open_cnt;
}
/*============================================================================
* 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 wanpipe_close (sdla_t* card)
{
--card->open_cnt;
}
/*============================================================================
* Set WAN device state.
*/
void wanpipe_set_state (sdla_t* card, int state)
{
if (card->wandev.state != state) {
switch (state) {
case WAN_CONNECTED:
printk (KERN_INFO "%s: link connected!\n",
card->devname);
break;
case WAN_CONNECTING:
printk (KERN_INFO "%s: link connecting...\n",
card->devname);
break;
case WAN_DISCONNECTED:
printk (KERN_INFO "%s: link disconnected!\n",
card->devname);
break;
}
card->wandev.state = state;
}
card->state_tick = jiffies;
}
sdla_t * wanpipe_find_card (char *name)
{
int cnt;
for (cnt = 0; cnt < ncards; ++ cnt) {
sdla_t* card = &card_array[cnt];
if (!strcmp(card->devname,name))
return card;
}
return NULL;
}
sdla_t * wanpipe_find_card_num (int num)
{
if (num < 1 || num > ncards)
return NULL;
num--;
return &card_array[num];
}
/*
* @work_pointer: work_struct to be done;
* should already have PREPARE_WORK() or
* INIT_WORK() done on it by caller;
*/
void wanpipe_queue_work (struct work_struct *work_pointer)
{
if (test_and_set_bit(1, (void*)&wanpipe_bh_critical))
printk(KERN_INFO "CRITICAL IN QUEUING WORK\n");
queue_work(wanpipe_wq, work_pointer);
clear_bit(1,(void*)&wanpipe_bh_critical);
}
void wakeup_sk_bh(struct net_device *dev)
{
wanpipe_common_t *chan = dev->priv;
if (test_bit(0,&chan->common_critical))
return;
if (chan->sk && chan->tx_timer){
chan->tx_timer->expires=jiffies+1;
add_timer(chan->tx_timer);
}
}
int change_dev_flags(struct net_device *dev, unsigned flags)
{
struct ifreq if_info;
mm_segment_t fs = get_fs();
int err;
memset(&if_info, 0, sizeof(if_info));
strcpy(if_info.ifr_name, dev->name);
if_info.ifr_flags = flags;
set_fs(get_ds()); /* get user space block */
err = devinet_ioctl(SIOCSIFFLAGS, &if_info);
set_fs(fs);
return err;
}
unsigned long get_ip_address(struct net_device *dev, int option)
{
struct in_ifaddr *ifaddr;
struct in_device *in_dev;
unsigned long addr = 0;
rcu_read_lock();
if ((in_dev = __in_dev_get_rcu(dev)) == NULL){
goto out;
}
if ((ifaddr = in_dev->ifa_list)== NULL ){
goto out;
}
switch (option){
case WAN_LOCAL_IP:
addr = ifaddr->ifa_local;
break;
case WAN_POINTOPOINT_IP:
addr = ifaddr->ifa_address;
break;
case WAN_NETMASK_IP:
addr = ifaddr->ifa_mask;
break;
case WAN_BROADCAST_IP:
addr = ifaddr->ifa_broadcast;
break;
default:
break;
}
out:
rcu_read_unlock();
return addr;
}
void add_gateway(sdla_t *card, struct net_device *dev)
{
mm_segment_t oldfs;
struct rtentry route;
int res;
memset((char*)&route,0,sizeof(struct rtentry));
((struct sockaddr_in *)
&(route.rt_dst))->sin_addr.s_addr = 0;
((struct sockaddr_in *)
&(route.rt_dst))->sin_family = AF_INET;
((struct sockaddr_in *)
&(route.rt_genmask))->sin_addr.s_addr = 0;
((struct sockaddr_in *)
&(route.rt_genmask)) ->sin_family = AF_INET;
route.rt_flags = 0;
route.rt_dev = dev->name;
oldfs = get_fs();
set_fs(get_ds());
res = ip_rt_ioctl(SIOCADDRT,&route);
set_fs(oldfs);
if (res == 0){
printk(KERN_INFO "%s: Gateway added for %s\n",
card->devname,dev->name);
}
return;
}
MODULE_LICENSE("GPL");
/****** End *********************************************************/
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