airo_cs.c

pcmcia source code

/*======================================================================
  
  airo_config() is scheduled to run after a CARD_INSERTION event
  is received, to configure the PCMCIA socket, and to make the
  device available to the system.
  
  ======================================================================*/

#define CS_CHECK(fn, args...) \
while ((last_ret=CardServices(last_fn=(fn),args))!=0) goto cs_failed

#define CFG_CHECK(fn, args...) \
if (CardServices(fn, args) != 0) goto next_entry

static void airo_config(dev_link_t *link)
{
	client_handle_t handle;
	tuple_t tuple;
	cisparse_t parse;
	local_info_t *dev;
	int last_fn, last_ret;
	u_char buf[64];
	win_req_t req;
	memreq_t map;
	cistpl_cftable_entry_t dflt = { 0 };
	
	handle = link->handle;
	dev = link->priv;

	DEBUG(0, "airo_config(0x%p)\n", link);
	
	/*
	  This reads the card's CONFIG tuple to find its configuration
	  registers.
	*/
	tuple.DesiredTuple = CISTPL_CONFIG;
	tuple.Attributes = 0;
	tuple.TupleData = buf;
	tuple.TupleDataMax = sizeof(buf);
	tuple.TupleOffset = 0;
	CS_CHECK(GetFirstTuple, handle, &tuple);
	CS_CHECK(GetTupleData, handle, &tuple);
	CS_CHECK(ParseTuple, handle, &tuple, &parse);
	link->conf.ConfigBase = parse.config.base;
	link->conf.Present = parse.config.rmask[0];
	
	/* Configure card */
	link->state |= DEV_CONFIG;
	
	/*
	  In this loop, we scan the CIS for configuration table entries,
	  each of which describes a valid card configuration, including
	  voltage, IO window, memory window, and interrupt settings.
	  
	  We make no assumptions about the card to be configured: we use
	  just the information available in the CIS.  In an ideal world,
	  this would work for any PCMCIA card, but it requires a complete
	  and accurate CIS.  In practice, a driver usually "knows" most of
	  these things without consulting the CIS, and most client drivers
	  will only use the CIS to fill in implementation-defined details.
	*/
	tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
	CS_CHECK(GetFirstTuple, handle, &tuple);
	while (1) {
		cistpl_cftable_entry_t *cfg = &(parse.cftable_entry);
		CFG_CHECK(GetTupleData, handle, &tuple);
		CFG_CHECK(ParseTuple, handle, &tuple, &parse);
		
		if (cfg->flags & CISTPL_CFTABLE_DEFAULT) dflt = *cfg;
		if (cfg->index == 0) goto next_entry;
		link->conf.ConfigIndex = cfg->index;
		
		/* Does this card need audio output? */
		if (cfg->flags & CISTPL_CFTABLE_AUDIO) {
			link->conf.Attributes |= CONF_ENABLE_SPKR;
			link->conf.Status = CCSR_AUDIO_ENA;
		}
		
		/* Use power settings for Vcc and Vpp if present */
		/*  Note that the CIS values need to be rescaled */
		if (cfg->vcc.present & (1<<CISTPL_POWER_VNOM))
			link->conf.Vcc = cfg->vcc.param[CISTPL_POWER_VNOM]/10000;
		else if (dflt.vcc.present & (1<<CISTPL_POWER_VNOM))
			link->conf.Vcc = dflt.vcc.param[CISTPL_POWER_VNOM]/10000;
		
		if (cfg->vpp1.present & (1<<CISTPL_POWER_VNOM))
			link->conf.Vpp1 = link->conf.Vpp2 =
				cfg->vpp1.param[CISTPL_POWER_VNOM]/10000;
		else if (dflt.vpp1.present & (1<<CISTPL_POWER_VNOM))
			link->conf.Vpp1 = link->conf.Vpp2 =
				dflt.vpp1.param[CISTPL_POWER_VNOM]/10000;
		
		/* Do we need to allocate an interrupt? */
		if (cfg->irq.IRQInfo1 || dflt.irq.IRQInfo1)
			link->conf.Attributes |= CONF_ENABLE_IRQ;
		
		/* IO window settings */
		link->io.NumPorts1 = link->io.NumPorts2 = 0;
		if ((cfg->io.nwin > 0) || (dflt.io.nwin > 0)) {
			cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt.io;
			link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
			if (!(io->flags & CISTPL_IO_8BIT))
				link->io.Attributes1 = IO_DATA_PATH_WIDTH_16;
			if (!(io->flags & CISTPL_IO_16BIT))
				link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
			link->io.BasePort1 = io->win[0].base;
			link->io.NumPorts1 = io->win[0].len;
			if (io->nwin > 1) {
				link->io.Attributes2 = link->io.Attributes1;
				link->io.BasePort2 = io->win[1].base;
				link->io.NumPorts2 = io->win[1].len;
			}
		}
		
		/* This reserves IO space but doesn't actually enable it */
		CFG_CHECK(RequestIO, link->handle, &link->io); 
		
		/*
		  Now set up a common memory window, if needed.  There is room
		  in the dev_link_t structure for one memory window handle,
		  but if the base addresses need to be saved, or if multiple
		  windows are needed, the info should go in the private data
		  structure for this device.
		  
		  Note that the memory window base is a physical address, and
		  needs to be mapped to virtual space with ioremap() before it
		  is used.
		*/
		if ((cfg->mem.nwin > 0) || (dflt.mem.nwin > 0)) {
			cistpl_mem_t *mem =
				(cfg->mem.nwin) ? &cfg->mem : &dflt.mem;
			req.Attributes = WIN_DATA_WIDTH_16|WIN_MEMORY_TYPE_CM;
			req.Base = mem->win[0].host_addr;
			req.Size = mem->win[0].len;
			req.AccessSpeed = 0;
			link->win = (window_handle_t)link->handle;
			CFG_CHECK(RequestWindow, &link->win, &req);
			map.Page = 0; map.CardOffset = mem->win[0].card_addr;
			CFG_CHECK(MapMemPage, link->win, &map);
		}
		/* If we got this far, we're cool! */
		break;
		
	next_entry:
		CS_CHECK(GetNextTuple, handle, &tuple);
	}
	
    /*
      Allocate an interrupt line.  Note that this does not assign a
      handler to the interrupt, unless the 'Handler' member of the
      irq structure is initialized.
    */
	if (link->conf.Attributes & CONF_ENABLE_IRQ)
		CS_CHECK(RequestIRQ, link->handle, &link->irq);
	
	/*
	  This actually configures the PCMCIA socket -- setting up
	  the I/O windows and the interrupt mapping, and putting the
	  card and host interface into "Memory and IO" mode.
	*/
	CS_CHECK(RequestConfiguration, link->handle, &link->conf);
	((local_info_t*)link->priv)->eth_dev = 
		init_airo_card( link->irq.AssignedIRQ,
				link->io.BasePort1 );
	if (!((local_info_t*)link->priv)->eth_dev) goto cs_failed;
	
	/*
	  At this point, the dev_node_t structure(s) need to be
	  initialized and arranged in a linked list at link->dev.
	*/
	strcpy(dev->node.dev_name, ((local_info_t*)link->priv)->eth_dev->name );
	dev->node.major = dev->node.minor = 0;
	link->dev = &dev->node;
	
	/* Finally, report what we've done */
	printk(KERN_INFO "%s: index 0x%02x: Vcc %d.%d",
	       dev->node.dev_name, link->conf.ConfigIndex,
	       link->conf.Vcc/10, link->conf.Vcc%10);
	if (link->conf.Vpp1)
		printk(", Vpp %d.%d", link->conf.Vpp1/10, link->conf.Vpp1%10);
	if (link->conf.Attributes & CONF_ENABLE_IRQ)
		printk(", irq %d", link->irq.AssignedIRQ);
	if (link->io.NumPorts1)
		printk(", io 0x%04x-0x%04x", link->io.BasePort1,
		       link->io.BasePort1+link->io.NumPorts1-1);
	if (link->io.NumPorts2)
		printk(" & 0x%04x-0x%04x", link->io.BasePort2,
		       link->io.BasePort2+link->io.NumPorts2-1);
	if (link->win)
		printk(", mem 0x%06lx-0x%06lx", req.Base,
		       req.Base+req.Size-1);
	printk("\n");
	
	link->state &= ~DEV_CONFIG_PENDING;
	return;
	
 cs_failed:
	cs_error(link->handle, last_fn, last_ret);
	airo_release((u_long)link);
	link->state &= ~DEV_CONFIG_PENDING;
	
} /* airo_config */

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

static void airo_release(u_long arg)
{
	dev_link_t *link = (dev_link_t *)arg;
	
	DEBUG(0, "airo_release(0x%p)\n", link);
	
	/*
	  If the device is currently in use, we won't release until it
	  is actually closed, because until then, we can't be sure that
	  no one will try to access the device or its data structures.
	*/
	if (link->open) {
		DEBUG(1, "airo_cs: release postponed, '%s' still open\n",
		      link->dev->dev_name);
		link->state |= DEV_STALE_CONFIG;
		return;
	}
	
	/* Unlink the device chain */
	link->dev = NULL;
	
	/*
	  In a normal driver, additional code may be needed to release
	  other kernel data structures associated with this device. 
	*/
	
	/* Don't bother checking to see if these succeed or not */
	if (link->win)
		CardServices(ReleaseWindow, link->win);
	CardServices(ReleaseConfiguration, link->handle);
	if (link->io.NumPorts1)
		CardServices(ReleaseIO, link->handle, &link->io);
	if (link->irq.AssignedIRQ)
		CardServices(ReleaseIRQ, link->handle, &link->irq);
	link->state &= ~DEV_CONFIG;
	
} /* airo_release */

/*======================================================================
  
  The card status event handler.  Mostly, this schedules other
  stuff to run after an event is received.

  When a CARD_REMOVAL event is received, we immediately set a
  private 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 airo_event(event_t event, int priority,
		      event_callback_args_t *args)
{
	dev_link_t *link = args->client_data;
	local_info_t *local = link->priv;
	
	DEBUG(1, "airo_event(0x%06x)\n", event);
	
	switch (event) {
	case CS_EVENT_CARD_REMOVAL:
		link->state &= ~DEV_PRESENT;
		if (link->state & DEV_CONFIG) {
			netif_device_detach(local->eth_dev);
			mod_timer(&link->release, jiffies + HZ/20);
		}
		break;
	case CS_EVENT_CARD_INSERTION:
		link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
		airo_config(link);
		break;
	case CS_EVENT_PM_SUSPEND:
		link->state |= DEV_SUSPEND;
		/* Fall through... */
	case CS_EVENT_RESET_PHYSICAL:
		if (link->state & DEV_CONFIG) {
			netif_device_detach(local->eth_dev);
			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);
			reset_airo_card(local->eth_dev);
			netif_device_attach(local->eth_dev);
		}
		break;
	}
	return 0;
} /* airo_event */

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

int init_module(void)
{
	servinfo_t serv;
	DEBUG(0, "%s\n", version);
	CardServices(GetCardServicesInfo, &serv);
	if (serv.Revision != CS_RELEASE_CODE) {
		printk(KERN_NOTICE "airo_cs: Card Services release "
		       "does not match!\n");
		return -EINVAL;
	}
	register_pcmcia_driver(&dev_info, &airo_attach, &airo_detach);
	return 0;
}

void cleanup_module(void)
{
	DEBUG(0, "airo_cs: unloading\n");
	unregister_pcmcia_driver(&dev_info);
	while (dev_list != NULL) {
		if (dev_list->state & DEV_CONFIG)
			airo_release((u_long)dev_list);
		airo_detach(dev_list);
	}
}