orinoco_cs.c

linux-2.6.15.6

/* orinoco_cs.c (formerly known as dldwd_cs.c)
 *
 * A driver for "Hermes" chipset based PCMCIA wireless adaptors, such
 * as the Lucent WavelanIEEE/Orinoco cards and their OEM (Cabletron/
 * EnteraSys RoamAbout 802.11, ELSA Airlancer, Melco Buffalo and others).
 * It should also be usable on various Prism II based cards such as the
 * Linksys, D-Link and Farallon Skyline. It should also work on Symbol
 * cards such as the 3Com AirConnect and Ericsson WLAN.
 * 
 * Copyright notice & release notes in file orinoco.c
 */

#define DRIVER_NAME "orinoco_cs"
#define PFX DRIVER_NAME ": "

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ds.h>

#include "orinoco.h"

/********************************************************************/
/* Module stuff							    */
/********************************************************************/

MODULE_AUTHOR("David Gibson <[e-mail]>");
MODULE_DESCRIPTION("Driver for PCMCIA Lucent Orinoco, Prism II based and similar wireless cards");
MODULE_LICENSE("Dual MPL/GPL");

/* Module parameters */

/* Some D-Link cards have buggy CIS. They do work at 5v properly, but
 * don't have any CIS entry for it. This workaround it... */
static int ignore_cis_vcc; /* = 0 */
module_param(ignore_cis_vcc, int, 0);
MODULE_PARM_DESC(ignore_cis_vcc, "Allow voltage mismatch between card and socket");

/********************************************************************/
/* Magic constants						    */
/********************************************************************/

/*
 * The dev_info variable is the "key" that is used to match up this
 * device driver with appropriate cards, through the card
 * configuration database.
 */
static dev_info_t dev_info = DRIVER_NAME;

/********************************************************************/
/* Data structures						    */
/********************************************************************/

/* PCMCIA specific device information (goes in the card field of
 * struct orinoco_private */
struct orinoco_pccard {
	dev_link_t link;
	dev_node_t node;

	/* Used to handle hard reset */
	/* yuck, we need this hack to work around the insanity of the
         * PCMCIA layer */
	unsigned long hard_reset_in_progress; 
};

/*
 * A linked list of "instances" of the device.  Each actual PCMCIA
 * card corresponds to one device instance, and is described by one
 * dev_link_t structure (defined in ds.h).
 */
static dev_link_t *dev_list; /* = NULL */

/********************************************************************/
/* Function prototypes						    */
/********************************************************************/

static void orinoco_cs_release(dev_link_t *link);
static void orinoco_cs_detach(dev_link_t *link);

/********************************************************************/
/* Device methods     						    */
/********************************************************************/

static int
orinoco_cs_hard_reset(struct orinoco_private *priv)
{
	struct orinoco_pccard *card = priv->card;
	dev_link_t *link = &card->link;
	int err;

	/* We need atomic ops here, because we're not holding the lock */
	set_bit(0, &card->hard_reset_in_progress);

	err = pcmcia_reset_card(link->handle, NULL);
	if (err)
		return err;

	msleep(100);
	clear_bit(0, &card->hard_reset_in_progress);

	return 0;
}

/********************************************************************/
/* PCMCIA stuff     						    */
/********************************************************************/

/*
 * This creates an "instance" of the driver, allocating local data
 * structures for one device.  The device is registered with Card
 * Services.
 * 
 * The dev_link structure is initialized, but we don't actually
 * configure the card at this point -- we wait until we receive a card
 * insertion event.  */
static dev_link_t *
orinoco_cs_attach(void)
{
	struct net_device *dev;
	struct orinoco_private *priv;
	struct orinoco_pccard *card;
	dev_link_t *link;
	client_reg_t client_reg;
	int ret;

	dev = alloc_orinocodev(sizeof(*card), orinoco_cs_hard_reset);
	if (! dev)
		return NULL;
	priv = netdev_priv(dev);
	card = priv->card;

	/* Link both structures together */
	link = &card->link;
	link->priv = dev;

	/* Interrupt setup */
	link->irq.Attributes = IRQ_TYPE_EXCLUSIVE | IRQ_HANDLE_PRESENT;
	link->irq.IRQInfo1 = IRQ_LEVEL_ID;
	link->irq.Handler = orinoco_interrupt;
	link->irq.Instance = dev; 

	/* General socket configuration defaults can go here.  In this
	 * client, we assume very little, and rely on the CIS for
	 * almost everything.  In most clients, many details (i.e.,
	 * number, sizes, and attributes of IO windows) are fixed by
	 * the nature of the device, and can be hard-wired here. */
	link->conf.Attributes = 0;
	link->conf.IntType = INT_MEMORY_AND_IO;

	/* Register with Card Services */
	/* FIXME: need a lock? */
	link->next = dev_list;
	dev_list = link;

	client_reg.dev_info = &dev_info;
	client_reg.Version = 0x0210; /* FIXME: what does this mean? */
	client_reg.event_callback_args.client_data = link;

	ret = pcmcia_register_client(&link->handle, &client_reg);
	if (ret != CS_SUCCESS) {
		cs_error(link->handle, RegisterClient, ret);
		orinoco_cs_detach(link);
		return NULL;
	}

	return link;
}				/* orinoco_cs_attach */

/*
 * This deletes a driver "instance".  The device is de-registered with
 * Card Services.  If it has been released, all local data structures
 * are freed.  Otherwise, the structures will be freed when the device
 * is released.
 */
static void orinoco_cs_detach(dev_link_t *link)
{
	dev_link_t **linkp;
	struct net_device *dev = link->priv;

	/* Locate device structure */
	for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
		if (*linkp == link)
			break;

	BUG_ON(*linkp == NULL);

	if (link->state & DEV_CONFIG)
		orinoco_cs_release(link);

	/* Break the link with Card Services */
	if (link->handle)
		pcmcia_deregister_client(link->handle);

	/* Unlink device structure, and free it */
	*linkp = link->next;
	DEBUG(0, PFX "detach: link=%p link->dev=%p\n", link, link->dev);
	if (link->dev) {
		DEBUG(0, PFX "About to unregister net device %p\n",
		      dev);
		unregister_netdev(dev);
	}
	free_orinocodev(dev);
}				/* orinoco_cs_detach */

/*
 * orinoco_cs_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, ret) do { \
		last_fn = (fn); if ((last_ret = (ret)) != 0) goto cs_failed; \
	} while (0)

static void
orinoco_cs_config(dev_link_t *link)
{
	struct net_device *dev = link->priv;
	client_handle_t handle = link->handle;
	struct orinoco_private *priv = netdev_priv(dev);
	struct orinoco_pccard *card = priv->card;
	hermes_t *hw = &priv->hw;
	int last_fn, last_ret;
	u_char buf[64];
	config_info_t conf;
	cisinfo_t info;
	tuple_t tuple;
	cisparse_t parse;
	void __iomem *mem;

	CS_CHECK(ValidateCIS, pcmcia_validate_cis(handle, &info));

	/*
	 * 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, pcmcia_get_first_tuple(handle, &tuple));
	CS_CHECK(GetTupleData, pcmcia_get_tuple_data(handle, &tuple));
	CS_CHECK(ParseTuple, pcmcia_parse_tuple(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,
		 pcmcia_get_configuration_info(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, pcmcia_get_first_tuple(handle, &tuple));
	while (1) {
		cistpl_cftable_entry_t *cfg = &(parse.cftable_entry);
		cistpl_cftable_entry_t dflt = { .index = 0 };

		if ( (pcmcia_get_tuple_data(handle, &tuple) != 0)
		    || (pcmcia_parse_tuple(handle, &tuple, &parse) != 0))
			goto next_entry;

		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) {
				DEBUG(2, "orinoco_cs_config: Vcc mismatch (conf.Vcc = %d, CIS = %d)\n",  conf.Vcc, cfg->vcc.param[CISTPL_POWER_VNOM] / 10000);
				if (!ignore_cis_vcc)
					goto next_entry;
			}
		} else if (dflt.vcc.present & (1 << CISTPL_POWER_VNOM)) {
			if (conf.Vcc != dflt.vcc.param[CISTPL_POWER_VNOM] / 10000) {
				DEBUG(2, "orinoco_cs_config: Vcc mismatch (conf.Vcc = %d, CIS = %d)\n",  conf.Vcc, dflt.vcc.param[CISTPL_POWER_VNOM] / 10000);
				if(!ignore_cis_vcc)
					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? */
		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;
			}