dummy_cs.c

pcmcia source code

    memreq_t map;
    cistpl_cftable_entry_t dflt = { 0 };
    
    DEBUG(0, "dummy_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;

    /* Look up the current Vcc */
    CS_CHECK(GetConfigurationInfo, handle, &conf);
    link->conf.Vcc = conf.Vcc;

    /*
      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)) {
	    if (conf.Vcc != cfg->vcc.param[CISTPL_POWER_VNOM]/10000)
		goto next_entry;
	} else if (dflt.vcc.present & (1<<CISTPL_POWER_VNOM)) {
	    if (conf.Vcc != dflt.vcc.param[CISTPL_POWER_VNOM]/10000)
		goto next_entry;
	}
	    
	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.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK;
	    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.Attributes |= WIN_ENABLE;
	    req.Base = mem->win[0].host_addr;
	    req.Size = mem->win[0].len;
	    if (req.Size < 0x1000)
		req.Size = 0x1000;
	    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:
	if (link->io.NumPorts1)
	    CardServices(ReleaseIO, link->handle, &link->io);
	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);

    /*
      We can release the IO port allocations here, if some other
      driver for the card is going to loaded, and will expect the
      ports to be available.
    */
    if (free_ports) {
	if (link->io.BasePort1)
	    release_region(link->io.BasePort1, link->io.NumPorts1);
	if (link->io.BasePort2)
	    release_region(link->io.BasePort2, link->io.NumPorts2);
    }

    /*
      At this point, the dev_node_t structure(s) need to be
      initialized and arranged in a linked list at link->dev.
    */
    sprintf(dev->node.dev_name, "skel0");
    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);
    dummy_release((u_long)link);
    link->state &= ~DEV_CONFIG_PENDING;

} /* dummy_config */

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

    After a card is removed, dummy_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 dummy_release(u_long arg)
{
    dev_link_t *link = (dev_link_t *)arg;

    DEBUG(0, "dummy_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, "dummy_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;
    
    if (link->state & DEV_STALE_LINK)
	dummy_detach(link);
    
} /* dummy_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 dummy_event(event_t event, int priority,
		       event_callback_args_t *args)
{
    dev_link_t *link = args->client_data;
    local_info_t *dev = link->priv;
    
    DEBUG(1, "dummy_event(0x%06x)\n", event);
    
    switch (event) {
    case CS_EVENT_CARD_REMOVAL:
	link->state &= ~DEV_PRESENT;
	if (link->state & DEV_CONFIG) {
	    ((local_info_t *)link->priv)->stop = 1;
	    mod_timer(&link->release, jiffies + HZ/20);
	}
	break;
    case CS_EVENT_CARD_INSERTION:
	link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
	dev->bus = args->bus;
	dummy_config(link);
	break;
    case CS_EVENT_PM_SUSPEND:
	link->state |= DEV_SUSPEND;
	/* Fall through... */
    case CS_EVENT_RESET_PHYSICAL:
	/* Mark the device as stopped, to block IO until later */
	dev->stop = 1;
	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);
	dev->stop = 0;
	/*
	  In a normal driver, additional code may go here to restore
	  the device state and restart IO. 
	*/
	break;
    }
    return 0;
} /* dummy_event */

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

static int __init init_dummy_cs(void)
{
    servinfo_t serv;
    DEBUG(0, "%s\n", version);
    CardServices(GetCardServicesInfo, &serv);
    if (serv.Revision != CS_RELEASE_CODE) {
	printk(KERN_NOTICE "dummy_cs: Card Services release "
	       "does not match!\n");
	return -EINVAL;
    }
    register_pccard_driver(&dev_info, &dummy_attach, &dummy_detach);
    return 0;
}

static void __exit exit_dummy_cs(void)
{
    DEBUG(0, "dummy_cs: unloading\n");
    unregister_pccard_driver(&dev_info);
    while (dev_list != NULL) {
	del_timer(&dev_list->release);
	if (dev_list->state & DEV_CONFIG)
	    dummy_release((u_long)dev_list);
	dummy_detach(dev_list);
    }
}

module_init(init_dummy_cs);
module_exit(exit_dummy_cs);