eicon_mod.c

讲述linux的初始化过程

			registered = 1;
                if (registered) {
			/* Init OK, next card ... */
                        q = p;
                        p = p->next;
                } else {
                        /* registering failed, remove card from list, free memory */
                        printk(KERN_ERR
                               "eicon: Initialization of %s failed\n",
                               p->interface.id);
                        if (q) {
                                q->next = p->next;
                                eicon_freecard(p);
                                p = q->next;
                        } else {
                                cards = p->next;
                                eicon_freecard(p);
                                p = cards;
                        }
			failed++;
                }
	}
        return (added - failed);
}


#ifdef MODULE
#define eicon_init init_module
#endif

int
eicon_init(void)
{
	int card_count = 0;
	char tmprev[50];

	DebugVar = 1;
	eicon_lock = (spinlock_t) SPIN_LOCK_UNLOCKED;

        printk(KERN_INFO "%s Rev: ", DRIVERNAME);
	strcpy(tmprev, eicon_revision);
	printk("%s/", eicon_getrev(tmprev));
	strcpy(tmprev, eicon_pci_revision);
#ifdef CONFIG_ISDN_DRV_EICON_PCI
	printk("%s/", eicon_getrev(tmprev));
#else
	printk("---/");
#endif
	strcpy(tmprev, eicon_isa_revision);
#ifdef CONFIG_ISDN_DRV_EICON_ISA
	printk("%s/", eicon_getrev(tmprev));
#else
	printk("---/");
#endif
	strcpy(tmprev, eicon_idi_revision);
	printk("%s\n", eicon_getrev(tmprev));
        printk(KERN_INFO "%s Release: %s%s (%s)\n", DRIVERNAME,
		DRIVERRELEASE, DRIVERPATCH, file_check());

#ifdef CONFIG_ISDN_DRV_EICON_ISA
#ifdef CONFIG_MCA
	/* Check if we have MCA-bus */
        if (!MCA_bus)
                {
                printk(KERN_INFO
                        "eicon: No MCA bus, ISDN-interfaces  not probed.\n");
        } else {
		eicon_log(NULL, 8,
			"eicon_mca_find_card, irq=%d.\n", 
				irq);
               	if (!eicon_mca_find_card(0, membase, irq, id))
                       card_count++;
        };
#else
	card_count = eicon_addcard(0, membase, irq, id, 0);
#endif /* CONFIG_MCA */
#endif /* CONFIG_ISDN_DRV_EICON_ISA */
 
#ifdef CONFIG_PCI
#ifdef CONFIG_ISDN_DRV_EICON_PCI
	DivasCardsDiscover();
	card_count += eicon_pci_find_card(id);
#endif
#endif

        if (!cards) {
#ifdef MODULE
#ifndef CONFIG_ISDN_DRV_EICON_PCI
#ifndef CONFIG_ISDN_DRV_EICON_ISA
                printk(KERN_INFO "Eicon: Driver is neither ISA nor PCI compiled !\n");
                printk(KERN_INFO "Eicon: Driver not loaded !\n");
#else
                printk(KERN_INFO "Eicon: No cards defined, driver not loaded !\n");
#endif
#else
                printk(KERN_INFO "Eicon: No PCI-cards found, driver not loaded !\n");
#endif
#endif /* MODULE */
		return -ENODEV;

	} else
		printk(KERN_INFO "Eicon: %d card%s added\n", card_count, 
                       (card_count>1)?"s":"");
        return 0;
}


#ifdef MODULE

void mod_inc_use_count(void)
{
        MOD_INC_USE_COUNT;
}

void mod_dec_use_count(void)
{
        MOD_DEC_USE_COUNT;
}

#ifdef CONFIG_ISDN_DRV_EICON_PCI
void DIVA_DIDD_Write(DESCRIPTOR *, int);
EXPORT_SYMBOL_NOVERS(DIVA_DIDD_Read);
EXPORT_SYMBOL_NOVERS(DIVA_DIDD_Write);
EXPORT_SYMBOL_NOVERS(DivasPrintf);
#else
int DivasCardNext;
card_t DivasCards[1];
#endif

void
cleanup_module(void)
{
#if CONFIG_PCI	
#ifdef CONFIG_ISDN_DRV_EICON_PCI
	card_t *pCard;
	word wCardIndex;
	extern int Divas_major;
	int iTmp = 0;
#endif
#endif
	
        eicon_card *card = cards;
        eicon_card *last;

        while (card) {
#ifdef CONFIG_ISDN_DRV_EICON_ISA
#ifdef CONFIG_MCA
        	if (MCA_bus)
                        {
                        mca_mark_as_unused (card->mca_slot);
                        mca_set_adapter_procfn(card->mca_slot, NULL, NULL);
                        };
#endif /* CONFIG_MCA */
#endif
                unregister_card(card); 
                card = card->next;
        }
        card = cards;
        while (card) {
                last = card;
                card = card->next;
		eicon_freecard(last);
        }

#if CONFIG_PCI	
#ifdef CONFIG_ISDN_DRV_EICON_PCI
	pCard = DivasCards;
	for (wCardIndex = 0; wCardIndex < MAX_CARDS; wCardIndex++)
	{
		if ((pCard->hw) && (pCard->hw->in_use))
		{
			(*pCard->card_reset)(pCard);
			
			UxIsrRemove(pCard->hw, pCard);
			UxCardHandleFree(pCard->hw);

			if(pCard->e_tbl != NULL)
			{
				kfree(pCard->e_tbl);
			}

			if(pCard->hw->card_type == DIA_CARD_TYPE_DIVA_SERVER_B)
			{
				release_region(pCard->hw->io_base,0x20);
				release_region(pCard->hw->reset_base,0x80);
			}

                        // If this is a 4BRI ...
                        if (pCard->hw->card_type == DIA_CARD_TYPE_DIVA_SERVER_Q)
                        {
                                // Skip over the next 3 virtual adapters
                                wCardIndex += 3;

                                // But free their handles
				for (iTmp = 0; iTmp < 3; iTmp++)
				{
					pCard++;
					UxCardHandleFree(pCard->hw);

					if(pCard->e_tbl != NULL)
					{
						kfree(pCard->e_tbl);
					}
				}
                        }
		}
		pCard++;
	}
	unregister_chrdev(Divas_major, "Divas");
#endif
#endif /* CONFIG_PCI */
        printk(KERN_INFO "%s unloaded\n", DRIVERNAME);
}

#else /* no module */

static int __init
eicon_setup(char *line)
{
        int i, argc;
	int ints[5];
	char *str;

	str = get_options(line, 4, ints);

        argc = ints[0];
        i = 1;
#ifdef CONFIG_ISDN_DRV_EICON_ISA
        if (argc) {
		membase = irq = -1;
		if (argc) {
			membase = ints[i];
			i++;
			argc--;
		}
		if (argc) {
			irq = ints[i];
			i++;
			argc--;
		}
		if (strlen(str)) {
			strcpy(id, str);
		} else {
			strcpy(id, "eicon");
		} 
       		printk(KERN_INFO "Eicon ISDN active driver setup (id=%s membase=0x%x irq=%d)\n",
			id, membase, irq);
	}
#else
	printk(KERN_INFO "Eicon ISDN active driver setup\n");
#endif
	return(1);
}
__setup("eicon=", eicon_setup);

#endif /* MODULE */

#ifdef CONFIG_ISDN_DRV_EICON_ISA
#ifdef CONFIG_MCA

struct eicon_mca_adapters_struct {
	char * name;
	int adf_id;
};
/* possible MCA-brands of eicon cards                                         */
struct eicon_mca_adapters_struct eicon_mca_adapters[] = {
	{ "ISDN-P/2 Adapter", 0x6abb },
	{ "ISDN-[S|SX|SCOM]/2 Adapter", 0x6a93 },
	{ "DIVA /MCA", 0x6336 },
	{ NULL, 0 },
};

int eicon_mca_find_card(int type,          /* type-idx of eicon-card          */
                        int membase,
		        int irq,
			char * id)         /* name of eicon-isdn-dev          */
{
	int j, curr_slot = 0;

       	eicon_log(NULL, 8,
		"eicon_mca_find_card type: %d, membase: %#x, irq %d \n",
		type, membase, irq);
	/* find a no-driver-assigned eicon card                               */
	for (j=0; eicon_mca_adapters[j].adf_id != 0; j++) 
		{
		for ( curr_slot=0; curr_slot<=MCA_MAX_SLOT_NR; curr_slot++) 
			{
			curr_slot = mca_find_unused_adapter(
				         eicon_mca_adapters[j].adf_id, curr_slot);
			if (curr_slot != MCA_NOTFOUND) 
				{
				/* check if pre-set parameters match
				   these of the card, check cards memory      */
				if (!(int) eicon_mca_probe(curr_slot,
                                                           j,
                                                	   membase, 
                                                           irq,
                                                           id))
					{
					return 0;
					/* means: adapter parms did match     */
					};
			};
			break;
			/* MCA_NOTFOUND-branch: no matching adapter of
			   THIS flavor found, next flavor                     */

            	};
	};
	/* all adapter flavors checked without match, finito with:            */
        return ENODEV;
};


/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 *  stolen from 3c523.c/elmc_getinfo, ewe, 10.5.1999 
 */
int eicon_info(char * buf, int slot, void *d)
{
	int len = 0;
	struct eicon_card *dev;

        dev = (struct eicon_card *) d;

	if (dev == NULL)
		return len;
	len += sprintf(buf+len, "eicon ISDN adapter, type %d.\n",dev->type);
	len += sprintf(buf+len, "IRQ: %d\n", dev->hwif.isa.irq);
	len += sprintf(buf+len, "MEMBASE: %#lx\n", (unsigned long)dev->hwif.isa.shmem);

	return len;
};

int eicon_mca_probe(int slot,  /* slot-nr where the card was detected         */
		    int a_idx, /* idx-nr of probed card in eicon_mca_adapters */
                    int membase,
                    int irq,
		    char * id) /* name of eicon-isdn-dev                      */
{				
	unsigned char adf_pos0;
	int cards_irq, cards_membase, cards_io;
	int type = EICON_CTYPE_S;
	int irq_array[]={0,3,4,2};
	int irq_array1[]={3,4,0,0,2,10,11,12};

        adf_pos0 = mca_read_stored_pos(slot,2);
	eicon_log(NULL, 8,
		"eicon_mca_probe irq=%d, membase=%d\n", 
		irq,
		membase);
	switch (a_idx) {
		case 0:                /* P/2-Adapter (== PRI/S2M ? )         */
			cards_membase= 0xC0000+((adf_pos0>>4)*0x4000);
			if (membase == -1) { 
				membase = cards_membase;
			} else {
				if (membase != cards_membase)
					return ENODEV;
			};
			cards_irq=irq_array[((adf_pos0 & 0xC)>>2)];
			if (irq == -1) { 
				irq = cards_irq;
			} else {
				if (irq != cards_irq)
					return ENODEV;
			};
			cards_io= 0xC00 + ((adf_pos0>>4)*0x10);
			type = EICON_CTYPE_ISAPRI; 
			break;

		case 1:                /* [S|SX|SCOM]/2                       */
			cards_membase= 0xC0000+((adf_pos0>>4)*0x2000);
			if (membase == -1) { 
				membase = cards_membase;
			} else {
				if (membase != cards_membase)
					return ENODEV;
			};
			cards_irq=irq_array[((adf_pos0 & 0xC)>>2)];
			if (irq == -1) { 
				irq = cards_irq;
			} else {
				if (irq != cards_irq)
					return ENODEV;
			};

			cards_io= 0xC00 + ((adf_pos0>>4)*0x10);
			type = EICON_CTYPE_SCOM; 
		 	break;	

		case 2:                /* DIVA/MCA                            */
			cards_io = 0x200+ ((adf_pos0>>4)* 0x20);
			cards_irq = irq_array1[(adf_pos0 & 0x7)];
			if (irq == -1) { 
				irq = cards_irq;
			} else {
				if (irq != cards_irq)
					return ENODEV;
			};
			type = 0; 
			break;
		default:
			return  ENODEV;
	};
	/* matching membase & irq */
	if ( 1 == eicon_addcard(type, membase, irq, id, 0)) { 
		mca_set_adapter_name(slot, eicon_mca_adapters[a_idx].name);
  		mca_set_adapter_procfn(slot, (MCA_ProcFn) eicon_info, cards);

        	mca_mark_as_used(slot);
		cards->mca_slot = slot; 
		/* card->io noch setzen  oder ?? */
		cards->mca_io = cards_io;
		cards->hwif.isa.io = cards_io;
		/* reset card */
		outb_p(0,cards_io+1);

		eicon_log(NULL, 8, "eicon_addcard: successful for slot # %d.\n", 
			cards->mca_slot+1);
		return  0 ; /* eicon_addcard added a card */
	} else {
		return ENODEV;
	};
};
#endif /* CONFIG_MCA */
#endif /* CONFIG_ISDN_DRV_EICON_ISA */