sdlamain.c

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/*****************************************************************************
* sdlamain.c	WANPIPE(tm) Multiprotocol WAN Link Driver.  Main module.
*
* Author:	Nenad Corbic	<[e-mail]>
*		Gideon Hack	
*
* Copyright:	(c) 1995-1999 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.
* ============================================================================
* 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 intializes 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/version.h>
#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/malloc.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/wanpipe.h>	/* WANPIPE common user API definitions */
#include <asm/uaccess.h>	/* kernel <-> user copy */
#include <asm/io.h>		/* phys_to_virt() */
#include <linux/pci.h>
#include <linux/sdlapci.h>

/****** 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	8		/* 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);
 
/* Module entry points */
int init_module (void);
void cleanup_module (void);

/* 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);

/* 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);

/* Miscellaneous functions */
STATIC void sdla_isr	(int irq, void* dev_id, struct pt_regs *regs);
STATIC void sdla_poll	(void* data);
static void release_hw  (sdla_t *card);

/****** 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) 1995-1999 Sangoma Technologies Inc.";
static int ncards = CONFIG_WANPIPE_CARDS;
static int active;			/* number of active cards */
static sdla_t* card_array;	/* adapter data space */

/* Task queue element for creating a 'thread' */
static struct tq_struct sdla_tq = { routine: sdla_poll };

/******* 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
 */
 
#ifdef MODULE
int init_module (void)
#else
int wanpipe_init2(void)
#endif
{
	int cnt, err = 0;

	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(ncards, MAX_CARDS);
	ncards = max(ncards, 1);
	card_array = kmalloc(sizeof(sdla_t) * ncards, GFP_KERNEL);
	if (card_array == NULL)
		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];
		wan_device_t* 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_ERR
				"%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);
		printk(KERN_INFO "IN Init Module: NO Cards registered\n");
		err = -ENODEV;
	}
	return err;
}

#ifdef MODULE
/*============================================================================
 * Module 'remove' entry point.
 * o unregister all adapters from the WAN router
 * o release all remaining system resources
 */
void cleanup_module (void)
{
	int i;

	for (i = 0; i < ncards; ++i) {
		sdla_t* card = &card_array[i];
		unregister_wan_device(card->devname);
	}
	kfree(card_array);
}

#endif

/******* 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 (wan_device_t* wandev, wandev_conf_t* conf)
{
	sdla_t* card;
	int err = 0;
	int irq=0;
	int i;

	/* Sanity checks */
	if ((wandev == NULL) || (wandev->private == NULL) || (conf == NULL))
		return -EFAULT;
		
	card = wandev->private;
	if (wandev->state != WAN_UNCONFIGURED)
		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_ERR
			"%s: firmware not found in configuration data!\n",
			wandev->name);
		return -EINVAL;
	}

	/* only check I/O port and IRQ if not an S514 adapter */
	if(!conf->S514_CPU_no[0]) {

                if (conf->ioport <= 0) {
                        printk(KERN_ERR
			"%s: can't configure without I/O port address!\n",
			wandev->name);
                        return -EINVAL;
                }
	
                if (conf->irq <= 0) {
                        printk(KERN_ERR "%s: can't configure without IRQ!\n",
			wandev->name);
                        return -EINVAL;
                }

		/* 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)
		 */
		if (!card->configured){
			for (i = 0; i < ncards; i ++) {
				sdla_t *nxt_card = &card_array[i];
				if (nxt_card->hw.port == conf->ioport && 
				    nxt_card != card && 
				    conf->config_id == WANCONFIG_CHDLC &&
				    nxt_card->wandev.config_id == WANCONFIG_CHDLC){
					irq = nxt_card->hw.irq;
					memcpy(&card->hw, &nxt_card->hw, sizeof(sdlahw_t));
					nxt_card->next = card;
					card->next = nxt_card;
					card->wandev.piggyback = WANOPT_YES;
				}
			}
			

			/* Make sure I/O port region is available */
			if (check_region(conf->ioport, SDLA_MAXIORANGE) && 
			    !card->wandev.piggyback) {
				printk(KERN_ERR
					"%s: I/O region 0x%X - 0x%X is in use!\n",
					wandev->name, conf->ioport,
					conf->ioport + SDLA_MAXIORANGE);
				return -EINVAL;
			}
		}
	}

	/* 
	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.
	*/ 
	else {
		if (!card->configured){
			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])&&
				   (conf->config_id == WANCONFIG_CHDLC)&&
				   (nxt_card->wandev.config_id == WANCONFIG_CHDLC)){

					irq = nxt_card->hw.irq;
					memcpy(&card->hw, &nxt_card->hw, sizeof(sdlahw_t));
					nxt_card->next = card;
					card->next = nxt_card;
					card->wandev.piggyback = WANOPT_YES;
				}
			}
		}
	}

	/* If the current card has already been configured
         * or its 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;
			printk(KERN_INFO "Setting CPU to %c and Slot to %i\n",
				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	/* But 0 means NULL */
			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){
			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_ERR "%s: Can't reserve IRQ %d!\n", wandev->name, irq);
			return -EINVAL;
		}

	}else{
		printk(KERN_INFO "%s: Card Configured %i or Piggybacking %i!\n",
			wandev->name,card->configured,card->wandev.piggyback);
	} 


	if (!card->configured){

	#ifdef CONFIG_SMP
		/* Initialize the Spin lock */
		printk(KERN_INFO "%s: Initializing SMP\n",wandev->name);
		spin_lock_init(&card->lock);
	#endif
		
		/* 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) {
#ifdef	CONFIG_WANPIPE_X25
	case SFID_X25_502:
	case SFID_X25_508:
		err = wpx_init(card, conf);
		break;
#endif

#ifdef	CONFIG_WANPIPE_FR
	case SFID_FR502:
	case SFID_FR508:
		err = wpf_init(card, conf);
		break;
#endif

#ifdef	CONFIG_WANPIPE_PPP
	case SFID_PPP502:
	case SFID_PPP508:
		err = wpp_init(card, conf);
		break;
#endif

#ifdef CONFIG_WANPIPE_CHDLC
	case SFID_CHDLC508:
	case SFID_CHDLC514:
//		if (conf->ft1){		
//			printk(KERN_INFO "%s: Starting FT1 Configurator\n",
//				card->devname);
//			err = wpft1_init(card, conf);
//		}else{
			err = wpc_init(card, conf);
//		}
		break;
#endif

#ifdef CONFIG_WANPIPE_BSTRM
	case SFID_BSC502:
		err = bsc_init(card, conf);
		break;
#endif

#ifdef CONFIG_WANPIPE_HDLC
	case SFID_HDLC508:
		err = hdlc_init(card, conf);
		break;
#endif

	default:
		printk(KERN_ERR "%s: this firmware is not supported %X %X!\n",
			wandev->name,card->hw.fwid,SFID_CHDLC508);
		err = -EINVAL;
	}