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kernel-ark/drivers/net/wireless/airo_cs.c

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/*======================================================================
Aironet driver for 4500 and 4800 series cards
This code is released under both the GPL version 2 and BSD licenses.
Either license may be used. The respective licenses are found at
the end of this file.
This code was developed by Benjamin Reed <breed@users.sourceforge.net>
including portions of which come from the Aironet PC4500
Developer's Reference Manual and used with permission. Copyright
(C) 1999 Benjamin Reed. All Rights Reserved. Permission to use
code in the Developer's manual was granted for this driver by
Aironet.
In addition this module was derived from dummy_cs.
The initial developer of dummy_cs is David A. Hinds
<dahinds@users.sourceforge.net>. Portions created by David A. Hinds
are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
======================================================================*/
#include <linux/config.h>
#ifdef __IN_PCMCIA_PACKAGE__
#include <pcmcia/k_compat.h>
#endif
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/netdevice.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ds.h>
#include <asm/io.h>
#include <asm/system.h>
/*
All the PCMCIA modules use PCMCIA_DEBUG to control debugging. If
you do not define PCMCIA_DEBUG at all, all the debug code will be
left out. If you compile with PCMCIA_DEBUG=0, the debug code will
be present but disabled -- but it can then be enabled for specific
modules at load time with a 'pc_debug=#' option to insmod.
*/
#ifdef PCMCIA_DEBUG
static int pc_debug = PCMCIA_DEBUG;
module_param(pc_debug, int, 0);
static char *version = "$Revision: 1.2 $";
#define DEBUG(n, args...) if (pc_debug>(n)) printk(KERN_DEBUG args);
#else
#define DEBUG(n, args...)
#endif
/*====================================================================*/
MODULE_AUTHOR("Benjamin Reed");
MODULE_DESCRIPTION("Support for Cisco/Aironet 802.11 wireless ethernet \
cards. This is the module that links the PCMCIA card \
with the airo module.");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_SUPPORTED_DEVICE("Aironet 4500, 4800 and Cisco 340 PCMCIA cards");
/*====================================================================*/
/*
The event() function is this driver's Card Services event handler.
It will be called by Card Services when an appropriate card status
event is received. The config() and release() entry points are
used to configure or release a socket, in response to card
insertion and ejection events. They are invoked from the airo_cs
event handler.
*/
struct net_device *init_airo_card( int, int, int, struct device * );
void stop_airo_card( struct net_device *, int );
int reset_airo_card( struct net_device * );
static void airo_config(dev_link_t *link);
static void airo_release(dev_link_t *link);
static int airo_event(event_t event, int priority,
event_callback_args_t *args);
/*
The attach() and detach() entry points are used to create and destroy
"instances" of the driver, where each instance represents everything
needed to manage one actual PCMCIA card.
*/
static dev_link_t *airo_attach(void);
static void airo_detach(dev_link_t *);
/*
You'll also need to prototype all the functions that will actually
be used to talk to your device. See 'pcmem_cs' for a good example
of a fully self-sufficient driver; the other drivers rely more or
less on other parts of the kernel.
*/
/*
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 = "airo_cs";
/*
A linked list of "instances" of the aironet device. Each actual
PCMCIA card corresponds to one device instance, and is described
by one dev_link_t structure (defined in ds.h).
You may not want to use a linked list for this -- for example, the
memory card driver uses an array of dev_link_t pointers, where minor
device numbers are used to derive the corresponding array index.
*/
static dev_link_t *dev_list = NULL;
/*
A dev_link_t structure has fields for most things that are needed
to keep track of a socket, but there will usually be some device
specific information that also needs to be kept track of. The
'priv' pointer in a dev_link_t structure can be used to point to
a device-specific private data structure, like this.
A driver needs to provide a dev_node_t structure for each device
on a card. In some cases, there is only one device per card (for
example, ethernet cards, modems). In other cases, there may be
many actual or logical devices (SCSI adapters, memory cards with
multiple partitions). The dev_node_t structures need to be kept
in a linked list starting at the 'dev' field of a dev_link_t
structure. We allocate them in the card's private data structure,
because they generally shouldn't be allocated dynamically.
In this case, we also provide a flag to indicate if a device is
"stopped" due to a power management event, or card ejection. The
device IO routines can use a flag like this to throttle IO to a
card that is not ready to accept it.
*/
typedef struct local_info_t {
dev_node_t node;
struct net_device *eth_dev;
} local_info_t;
/*======================================================================
airo_attach() 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 *airo_attach(void)
{
client_reg_t client_reg;
dev_link_t *link;
local_info_t *local;
int ret;
DEBUG(0, "airo_attach()\n");
/* Initialize the dev_link_t structure */
link = kmalloc(sizeof(struct dev_link_t), GFP_KERNEL);
if (!link) {
printk(KERN_ERR "airo_cs: no memory for new device\n");
return NULL;
}
memset(link, 0, sizeof(struct dev_link_t));
/* Interrupt setup */
link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
link->irq.IRQInfo1 = IRQ_LEVEL_ID;
link->irq.Handler = NULL;
/*
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.Vcc = 50;
link->conf.IntType = INT_MEMORY_AND_IO;
/* Allocate space for private device-specific data */
local = kmalloc(sizeof(local_info_t), GFP_KERNEL);
if (!local) {
printk(KERN_ERR "airo_cs: no memory for new device\n");
kfree (link);
return NULL;
}
memset(local, 0, sizeof(local_info_t));
link->priv = local;
/* Register with Card Services */
link->next = dev_list;
dev_list = link;
client_reg.dev_info = &dev_info;
client_reg.Version = 0x0210;
client_reg.event_callback_args.client_data = link;
ret = pcmcia_register_client(&link->handle, &client_reg);
if (ret != 0) {
cs_error(link->handle, RegisterClient, ret);
airo_detach(link);
return NULL;
}
return link;
} /* airo_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 airo_detach(dev_link_t *link)
{
dev_link_t **linkp;
DEBUG(0, "airo_detach(0x%p)\n", link);
/* Locate device structure */
for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
if (*linkp == link) break;
if (*linkp == NULL)
return;
if (link->state & DEV_CONFIG)
airo_release(link);
if ( ((local_info_t*)link->priv)->eth_dev ) {
stop_airo_card( ((local_info_t*)link->priv)->eth_dev, 0 );
}
((local_info_t*)link->priv)->eth_dev = NULL;
/* Break the link with Card Services */
if (link->handle)
pcmcia_deregister_client(link->handle);
/* Unlink device structure, free pieces */
*linkp = link->next;
kfree(link->priv);
kfree(link);
} /* airo_detach */
/*======================================================================
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, ret) \
do { last_fn = (fn); if ((last_ret = (ret)) != 0) goto cs_failed; } while (0)
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;
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, 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;
/*
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 dflt = { 0 };
cistpl_cftable_entry_t *cfg = &(parse.cftable_entry);
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))
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 */
if (pcmcia_request_io(link->handle, &link->io) != 0)
goto next_entry;
/*
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;
if (pcmcia_request_window(&link->handle, &req, &link->win) != 0)
goto next_entry;
map.Page = 0; map.CardOffset = mem->win[0].card_addr;
if (pcmcia_map_mem_page(link->win, &map) != 0)
goto next_entry;
}
/* If we got this far, we're cool! */
break;
next_entry:
CS_CHECK(GetNextTuple, pcmcia_get_next_tuple(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, pcmcia_request_irq(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, pcmcia_request_configuration(link->handle, &link->conf));
((local_info_t*)link->priv)->eth_dev =
init_airo_card( link->irq.AssignedIRQ,
link->io.BasePort1, 1, &handle_to_dev(handle) );
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(link);
} /* 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(dev_link_t *link)
{
DEBUG(0, "airo_release(0x%p)\n", link);
/* 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)
pcmcia_release_window(link->win);
pcmcia_release_configuration(link->handle);
if (link->io.NumPorts1)
pcmcia_release_io(link->handle, &link->io);
if (link->irq.AssignedIRQ)
pcmcia_release_irq(link->handle, &link->irq);
link->state &= ~DEV_CONFIG;
}
/*======================================================================
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);
airo_release(link);
}
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);
pcmcia_release_configuration(link->handle);
}
break;
case CS_EVENT_PM_RESUME:
link->state &= ~DEV_SUSPEND;
/* Fall through... */
case CS_EVENT_CARD_RESET:
if (link->state & DEV_CONFIG) {
pcmcia_request_configuration(link->handle, &link->conf);
reset_airo_card(local->eth_dev);
netif_device_attach(local->eth_dev);
}
break;
}
return 0;
} /* airo_event */
static struct pcmcia_device_id airo_ids[] = {
PCMCIA_DEVICE_MANF_CARD(0x015f, 0x000a),
PCMCIA_DEVICE_MANF_CARD(0x015f, 0x0005),
PCMCIA_DEVICE_MANF_CARD(0x015f, 0x0007),
PCMCIA_DEVICE_MANF_CARD(0x0105, 0x0007),
PCMCIA_DEVICE_NULL,
};
MODULE_DEVICE_TABLE(pcmcia, airo_ids);
static struct pcmcia_driver airo_driver = {
.owner = THIS_MODULE,
.drv = {
.name = "airo_cs",
},
.attach = airo_attach,
.event = airo_event,
.detach = airo_detach,
.id_table = airo_ids,
};
static int airo_cs_init(void)
{
return pcmcia_register_driver(&airo_driver);
}
static void airo_cs_cleanup(void)
{
pcmcia_unregister_driver(&airo_driver);
BUG_ON(dev_list != NULL);
}
/*
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
In addition:
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote
products derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
module_init(airo_cs_init);
module_exit(airo_cs_cleanup);
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