avm_cs.c

讲述linux的初始化过程

    cistpl_cftable_entry_t *cf = &parse.cftable_entry;
    local_info_t *dev;
    int i;
    u_char buf[64];
    char devname[128];
    int cardtype;
    int (*addcard)(unsigned int port, unsigned irq);
    
    handle = link->handle;
    dev = link->priv;

    /*
       This reads the card's CONFIG tuple to find its configuration
       registers.
    */
    do {
	tuple.DesiredTuple = CISTPL_CONFIG;
	i = CardServices(GetFirstTuple, handle, &tuple);
	if (i != CS_SUCCESS) break;
	tuple.TupleData = buf;
	tuple.TupleDataMax = 64;
	tuple.TupleOffset = 0;
	i = CardServices(GetTupleData, handle, &tuple);
	if (i != CS_SUCCESS) break;
	i = CardServices(ParseTuple, handle, &tuple, &parse);
	if (i != CS_SUCCESS) break;
	link->conf.ConfigBase = parse.config.base;
    } while (0);
    if (i != CS_SUCCESS) {
	cs_error(link->handle, ParseTuple, i);
	link->state &= ~DEV_CONFIG_PENDING;
	return;
    }
    
    /* Configure card */
    link->state |= DEV_CONFIG;

    do {

	tuple.Attributes = 0;
	tuple.TupleData = buf;
	tuple.TupleDataMax = 254;
	tuple.TupleOffset = 0;
	tuple.DesiredTuple = CISTPL_VERS_1;

	devname[0] = 0;
	if( !first_tuple(handle, &tuple, &parse) && parse.version_1.ns > 1 ) {
	    strncpy(devname,parse.version_1.str + parse.version_1.ofs[1], 
			sizeof(devname));
	}
	/*
         * find IO port
         */
	tuple.TupleData = (cisdata_t *)buf;
	tuple.TupleOffset = 0; tuple.TupleDataMax = 255;
	tuple.Attributes = 0;
	tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
	i = first_tuple(handle, &tuple, &parse);
	while (i == CS_SUCCESS) {
	    if (cf->io.nwin > 0) {
		link->conf.ConfigIndex = cf->index;
		link->io.BasePort1 = cf->io.win[0].base;
		link->io.NumPorts1 = cf->io.win[0].len;
		link->io.NumPorts2 = 0;
                printk(KERN_INFO "avm_cs: testing i/o %#x-%#x\n",
			link->io.BasePort1,
		        link->io.BasePort1+link->io.NumPorts1-1);
		i = CardServices(RequestIO, link->handle, &link->io);
		if (i == CS_SUCCESS) goto found_port;
	    }
	    i = next_tuple(handle, &tuple, &parse);
	}

found_port:
	if (i != CS_SUCCESS) {
	    cs_error(link->handle, RequestIO, i);
	    break;
	}
	
	/*
	 * allocate an interrupt line
	 */
	i = CardServices(RequestIRQ, link->handle, &link->irq);
	if (i != CS_SUCCESS) {
	    cs_error(link->handle, RequestIRQ, i);
	    CardServices(ReleaseIO, link->handle, &link->io);
	    break;
	}
	
	/*
         * configure the PCMCIA socket
	  */
	i = CardServices(RequestConfiguration, link->handle, &link->conf);
	if (i != CS_SUCCESS) {
	    cs_error(link->handle, RequestConfiguration, i);
	    CardServices(ReleaseIO, link->handle, &link->io);
	    CardServices(ReleaseIRQ, link->handle, &link->irq);
	    break;
	}

    } while (0);

    /* At this point, the dev_node_t structure(s) should be
       initialized and arranged in a linked list at link->dev. */

    if (devname[0]) {
	char *s = strrchr(devname, ' ');
	if (!s)
	   s = devname;
	else s++;
	strcpy(dev->node.dev_name, s);
        if (strcmp("M1", s) == 0) {
           cardtype = AVM_CARDTYPE_M1;
        } else if (strcmp("M2", s) == 0) {
           cardtype = AVM_CARDTYPE_M2;
	} else {
           cardtype = AVM_CARDTYPE_B1;
	}
    } else {
        strcpy(dev->node.dev_name, "b1");
        cardtype = AVM_CARDTYPE_B1;
    }

    dev->node.major = 64;
    dev->node.minor = 0;
    link->dev = &dev->node;
    
    link->state &= ~DEV_CONFIG_PENDING;
    /* If any step failed, release any partially configured state */
    if (i != 0) {
	avmcs_release((u_long)link);
	return;
    }


    switch (cardtype) {
        case AVM_CARDTYPE_M1: addcard = b1pcmcia_addcard_m1; break;
        case AVM_CARDTYPE_M2: addcard = b1pcmcia_addcard_m2; break;
	default:
        case AVM_CARDTYPE_B1: addcard = b1pcmcia_addcard_b1; break;
    }
    if ((i = (*addcard)(link->io.BasePort1, link->irq.AssignedIRQ)) < 0) {
        printk(KERN_ERR "avm_cs: failed to add AVM-%s-Controller at i/o %#x, irq %d\n",
		dev->node.dev_name, link->io.BasePort1, link->irq.AssignedIRQ);
	avmcs_release((u_long)link);
	return;
    }
    dev->node.minor = i;

} /* avmcs_config */

/*======================================================================

    After a card is removed, avmcs_release() will unregister the net
    device, and release the PCMCIA configuration.  If the device is
    still open, this will be postponed until it is closed.
    
======================================================================*/

static void avmcs_release(u_long arg)
{
    dev_link_t *link = (dev_link_t *)arg;

    /*
       If the device is currently in use, we won't release until it
       is actually closed.
    */
    if (link->open) {
	link->state |= DEV_STALE_CONFIG;
	return;
    }

    b1pcmcia_delcard(link->io.BasePort1, link->irq.AssignedIRQ);

    /* Unlink the device chain */
    link->dev = NULL;
    
    /* Don't bother checking to see if these succeed or not */
    CardServices(ReleaseConfiguration, link->handle);
    CardServices(ReleaseIO, link->handle, &link->io);
    CardServices(ReleaseIRQ, link->handle, &link->irq);
    link->state &= ~DEV_CONFIG;
    
    if (link->state & DEV_STALE_LINK)
	avmcs_detach(link);
    
} /* avmcs_release */

/*======================================================================

    The card status event handler.  Mostly, this schedules other
    stuff to run after an event is received.  A CARD_REMOVAL event
    also sets some flags to discourage the net drivers from trying
    to talk to the card any more.

    When a CARD_REMOVAL event is received, we immediately set a flag
    to block future accesses to this device.  All the functions that
    actually access the device should check this flag to make sure
    the card is still present.
    
======================================================================*/

static int avmcs_event(event_t event, int priority,
			  event_callback_args_t *args)
{
    dev_link_t *link = args->client_data;

    switch (event) {
    case CS_EVENT_CARD_REMOVAL:
	link->state &= ~DEV_PRESENT;
	if (link->state & DEV_CONFIG) {
	    link->release.expires = jiffies + (HZ/20);
	    add_timer(&link->release);
	}
	break;
    case CS_EVENT_CARD_INSERTION:
	link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
	avmcs_config(link);
	break;
    case CS_EVENT_PM_SUSPEND:
	link->state |= DEV_SUSPEND;
	/* Fall through... */
    case CS_EVENT_RESET_PHYSICAL:
	if (link->state & DEV_CONFIG)
	    CardServices(ReleaseConfiguration, link->handle);
	break;
    case CS_EVENT_PM_RESUME:
	link->state &= ~DEV_SUSPEND;
	/* Fall through... */
    case CS_EVENT_CARD_RESET:
	if (link->state & DEV_CONFIG)
	    CardServices(RequestConfiguration, link->handle, &link->conf);
	break;
    }
    return 0;
} /* avmcs_event */

/*====================================================================*/

static int __init avmcs_init(void)
{
    servinfo_t serv;
    CardServices(GetCardServicesInfo, &serv);
    if (serv.Revision != CS_RELEASE_CODE) {
	printk(KERN_NOTICE "avm_cs: Card Services release "
	       "does not match!\n");
	return -1;
    }
    register_pccard_driver(&dev_info, &avmcs_attach, &avmcs_detach);
    return 0;
}

static void __exit avmcs_exit(void)
{
    unregister_pccard_driver(&dev_info);
    while (dev_list != NULL) {
	if (dev_list->state & DEV_CONFIG)
	    avmcs_release((u_long)dev_list);
	avmcs_detach(dev_list);
    }
}

module_init(avmcs_init);
module_exit(avmcs_exit);