elsa_cs.c
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- /*======================================================================
- An elsa_cs PCMCIA client driver
- This driver is for the Elsa PCM ISDN Cards, i.e. the MicroLink
- The contents of this file are subject to the Mozilla Public
- License Version 1.1 (the "License"); you may not use this file
- except in compliance with the License. You may obtain a copy of
- the License at http://www.mozilla.org/MPL/
- Software distributed under the License is distributed on an "AS
- IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- implied. See the License for the specific language governing
- rights and limitations under the License.
- The initial developer of the original code is David A. Hinds
- <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
- are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
- Modifications from dummy_cs.c are Copyright (C) 1999-2001 Klaus
- Lichtenwalder <Lichtenwalder@ACM.org>. All Rights Reserved.
- Alternatively, the contents of this file may be used under the
- terms of the GNU General Public License version 2 (the "GPL"), in
- which case the provisions of the GPL are applicable instead of the
- above. If you wish to allow the use of your version of this file
- only under the terms of the GPL and not to allow others to use
- your version of this file under the MPL, indicate your decision
- by deleting the provisions above and replace them with the notice
- and other provisions required by the GPL. If you do not delete
- the provisions above, a recipient may use your version of this
- file under either the MPL or the GPL.
- ======================================================================*/
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/sched.h>
- #include <linux/ptrace.h>
- #include <linux/slab.h>
- #include <linux/string.h>
- #include <linux/timer.h>
- #include <linux/ioport.h>
- #include <asm/io.h>
- #include <asm/system.h>
- #include <pcmcia/version.h>
- #include <pcmcia/cs_types.h>
- #include <pcmcia/cs.h>
- #include <pcmcia/cistpl.h>
- #include <pcmcia/cisreg.h>
- #include <pcmcia/ds.h>
- #include <pcmcia/bus_ops.h>
- MODULE_DESCRIPTION("ISDN4Linux: PCMCIA client driver for Elsa PCM cards");
- MODULE_AUTHOR("Klaus Lichtenwalder");
- MODULE_LICENSE("Dual MPL/GPL");
- /*
- 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_PARM(pc_debug, "i");
- #define DEBUG(n, args...) if (pc_debug>(n)) printk(KERN_DEBUG args);
- static char *version =
- "elsa_cs.c $Revision: 1.1.4.1 $ $Date: 2001/11/20 14:19:35 $ (K.Lichtenwalder)";
- #else
- #define DEBUG(n, args...)
- #endif
- /*====================================================================*/
- /* Parameters that can be set with 'insmod' */
- /* Bit map of interrupts to choose from, the old way */
- /* This means pick from 15, 14, 12, 11, 10, 9, 7, 5, 4, 3 */
- static u_long irq_mask = 0xdeb8;
- /* Newer, simpler way of listing specific interrupts */
- static int irq_list[4] = { -1 };
- MODULE_PARM(irq_mask, "i");
- MODULE_PARM(irq_list, "1-4i");
- static int protocol = 2; /* EURO-ISDN Default */
- MODULE_PARM(protocol, "i");
- extern int elsa_init_pcmcia(int, int, int*, int);
- /*====================================================================*/
- /*
- 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 elsa_cs event
- handler.
- */
- static void elsa_cs_config(dev_link_t *link);
- static void elsa_cs_release(u_long arg);
- static int elsa_cs_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 *elsa_cs_attach(void);
- static void elsa_cs_detach(dev_link_t *);
- /*
- 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 = "elsa_cs";
- /*
- A linked list of "instances" of the elsa_cs 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.
- To simplify the data structure handling, we actually include the
- dev_link_t structure in the device's private data structure.
- 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.
- The bus_operations pointer is used on platforms for which we need
- to use special socket-specific versions of normal IO primitives
- (inb, outb, readb, writeb, etc) for card IO.
- */
- typedef struct local_info_t {
- dev_link_t link;
- dev_node_t node;
- int busy;
- struct bus_operations *bus;
- } local_info_t;
- /*====================================================================*/
- static void cs_error(client_handle_t handle, int func, int ret)
- {
- error_info_t err = { func, ret};
- CardServices(ReportError, handle, &err);
- }
- /*======================================================================
- elsa_cs_attach() creates an "instance" of the driver, allocatingx
- 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 *elsa_cs_attach(void)
- {
- client_reg_t client_reg;
- dev_link_t *link;
- local_info_t *local;
- int ret, i;
- void elsa_interrupt(int, void *, struct pt_regs *);
- DEBUG(0, "elsa_cs_attach()n");
- /* Allocate space for private device-specific data */
- local = kmalloc(sizeof(local_info_t), GFP_KERNEL);
- if (!local) return NULL;
- memset(local, 0, sizeof(local_info_t));
- link = &local->link; link->priv = local;
- /* Initialize the dev_link_t structure */
- link->release.function = &elsa_cs_release;
- link->release.data = (u_long)link;
- /* Interrupt setup */
- link->irq.Attributes = IRQ_TYPE_DYNAMIC_SHARING|IRQ_FIRST_SHARED;
- link->irq.IRQInfo1 = IRQ_INFO2_VALID|IRQ_LEVEL_ID|IRQ_SHARE_ID;
- if (irq_list[0] == -1)
- link->irq.IRQInfo2 = irq_mask;
- else
- for (i = 0; i < 4; i++)
- link->irq.IRQInfo2 |= 1 << irq_list[i];
- 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->io.NumPorts1 = 8;
- link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
- link->io.IOAddrLines = 3;
- link->conf.Attributes = CONF_ENABLE_IRQ;
- link->conf.Vcc = 50;
- link->conf.IntType = INT_MEMORY_AND_IO;
- /* Register with Card Services */
- link->next = dev_list;
- dev_list = link;
- client_reg.dev_info = &dev_info;
- client_reg.Attributes = INFO_IO_CLIENT | INFO_CARD_SHARE;
- client_reg.EventMask =
- CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
- CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET |
- CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
- client_reg.event_handler = &elsa_cs_event;
- client_reg.Version = 0x0210;
- client_reg.event_callback_args.client_data = link;
- ret = CardServices(RegisterClient, &link->handle, &client_reg);
- if (ret != CS_SUCCESS) {
- cs_error(link->handle, RegisterClient, ret);
- elsa_cs_detach(link);
- return NULL;
- }
- return link;
- } /* elsa_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 elsa_cs_detach(dev_link_t *link)
- {
- dev_link_t **linkp;
- local_info_t *info = link->priv;
- int ret;
- DEBUG(0, "elsa_cs_detach(0x%p)n", link);
- /* Locate device structure */
- for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
- if (*linkp == link) break;
- if (*linkp == NULL)
- return;
- del_timer(&link->release);
- if (link->state & DEV_CONFIG)
- elsa_cs_release((u_long)link);
- /*
- If the device is currently configured and active, we won't
- actually delete it yet. Instead, it is marked so that when
- the release() function is called, that will trigger a proper
- detach().
- */
- if (link->state & DEV_CONFIG) {
- DEBUG(0, "elsa_cs: detach postponed, '%s' "
- "still lockedn", link->dev->dev_name);
- link->state |= DEV_STALE_LINK;
- return;
- }
- /* Break the link with Card Services */
- if (link->handle) {
- ret = CardServices(DeregisterClient, link->handle);
- if (ret != CS_SUCCESS)
- cs_error(link->handle, DeregisterClient, ret);
- }
- /* Unlink device structure and free it */
- *linkp = link->next;
- kfree(info);
- } /* elsa_cs_detach */
- /*======================================================================
- elsa_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.
- ======================================================================*/
- static int get_tuple(int fn, client_handle_t handle, tuple_t *tuple,
- cisparse_t *parse)
- {
- int i;
- i = CardServices(fn, handle, tuple);
- if (i != CS_SUCCESS) return i;
- i = CardServices(GetTupleData, handle, tuple);
- if (i != CS_SUCCESS) return i;
- return CardServices(ParseTuple, handle, tuple, parse);
- }
- #define first_tuple(a, b, c) get_tuple(GetFirstTuple, a, b, c)
- #define next_tuple(a, b, c) get_tuple(GetNextTuple, a, b, c)
- static void elsa_cs_config(dev_link_t *link)
- {
- client_handle_t handle;
- tuple_t tuple;
- cisparse_t parse;
- local_info_t *dev;
- int i, j, last_fn;
- u_short buf[128];
- cistpl_cftable_entry_t *cf = &parse.cftable_entry;
- DEBUG(0, "elsa_config(0x%p)n", link);
- handle = link->handle;
- dev = link->priv;
- /*
- This reads the card's CONFIG tuple to find its configuration
- registers.
- */
- tuple.DesiredTuple = CISTPL_CONFIG;
- tuple.TupleData = (cisdata_t *)buf;
- tuple.TupleDataMax = 255;
- tuple.TupleOffset = 0;
- tuple.Attributes = 0;
- i = first_tuple(handle, &tuple, &parse);
- if (i != CS_SUCCESS) {
- last_fn = ParseTuple;
- goto cs_failed;
- }
- link->conf.ConfigBase = parse.config.base;
- link->conf.Present = parse.config.rmask[0];
- /* Configure card */
- link->state |= DEV_CONFIG;
- 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) && cf->io.win[0].base) {
- printk(KERN_INFO "(elsa_cs: looks like the 96 model)n");
- link->conf.ConfigIndex = cf->index;
- link->io.BasePort1 = cf->io.win[0].base;
- i = CardServices(RequestIO, link->handle, &link->io);
- if (i == CS_SUCCESS) break;
- } else {
- printk(KERN_INFO "(elsa_cs: looks like the 97 model)n");
- link->conf.ConfigIndex = cf->index;
- for (i = 0, j = 0x2f0; j > 0x100; j -= 0x10) {
- link->io.BasePort1 = j;
- i = CardServices(RequestIO, link->handle, &link->io);
- if (i == CS_SUCCESS) break;
- }
- break;
- }
- i = next_tuple(handle, &tuple, &parse);
- }
- if (i != CS_SUCCESS) {
- last_fn = RequestIO;
- goto cs_failed;
- }
- i = CardServices(RequestIRQ, link->handle, &link->irq);
- if (i != CS_SUCCESS) {
- link->irq.AssignedIRQ = 0;
- last_fn = RequestIRQ;
- goto cs_failed;
- }
- i = CardServices(RequestConfiguration, link->handle, &link->conf);
- if (i != CS_SUCCESS) {
- last_fn = RequestConfiguration;
- goto cs_failed;
- }
- /* At this point, the dev_node_t structure(s) should be
- initialized and arranged in a linked list at link->dev. *//* */
- sprintf(dev->node.dev_name, "elsa");
- dev->node.major = dev->node.minor = 0x0;
- 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);
- printk("n");
- link->state &= ~DEV_CONFIG_PENDING;
- elsa_init_pcmcia(link->io.BasePort1, link->irq.AssignedIRQ,
- &(((local_info_t*)link->priv)->busy),
- protocol);
- return;
- cs_failed:
- cs_error(link->handle, last_fn, i);
- elsa_cs_release((u_long)link);
- } /* elsa_cs_config */
- /*======================================================================
- After a card is removed, elsa_cs_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 elsa_cs_release(u_long arg)
- {
- dev_link_t *link = (dev_link_t *)arg;
- DEBUG(0, "elsa_cs_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, "elsa_cs: release postponed, '%s' "
- "still openn", link->dev->dev_name);
- link->state |= DEV_STALE_CONFIG;
- return;
- }
- /* Unlink the device chain */
- link->dev = NULL;
- /* Don't bother checking to see if these succeed or not */
- if (link->win)
- CardServices(ReleaseWindow, link->win);
- 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)
- elsa_cs_detach(link);
- } /* elsa_cs_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 elsa_cs_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, "elsa_cs_event(%d)n", event);
- switch (event) {
- case CS_EVENT_CARD_REMOVAL:
- link->state &= ~DEV_PRESENT;
- if (link->state & DEV_CONFIG) {
- ((local_info_t*)link->priv)->busy = 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;
- elsa_cs_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->busy = 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->busy = 0;
- break;
- }
- return 0;
- } /* elsa_cs_event */
- /*====================================================================*/
- static int __init init_elsa_cs(void)
- {
- servinfo_t serv;
- DEBUG(0, "%sn", version);
- CardServices(GetCardServicesInfo, &serv);
- if (serv.Revision != CS_RELEASE_CODE) {
- printk(KERN_NOTICE "elsa_cs: Card Services release "
- "does not match!n");
- return -1;
- }
- register_pccard_driver(&dev_info, &elsa_cs_attach, &elsa_cs_detach);
- return 0;
- }
- static void __exit exit_elsa_cs(void)
- {
- DEBUG(0, "elsa_cs: unloadingn");
- unregister_pccard_driver(&dev_info);
- while (dev_list != NULL)
- elsa_cs_detach(dev_list);
- }
- module_init(init_elsa_cs);
- module_exit(exit_elsa_cs);