drivers/isdn/hisax/teles_cs.c

   1 /* $Id: teles_cs.c,v 1.1.2.2 2004/01/25 15:07:06 keil Exp $ */
   2 /*======================================================================
   3
   4     A teles S0 PCMCIA client driver
   5
   6     Based on skeleton by David Hinds, dhinds@allegro.stanford.edu
   7     Written by Christof Petig, christof.petig@wtal.de
   8
   9     Also inspired by ELSA PCMCIA driver
  10     by Klaus Lichtenwalder <Lichtenwalder@ACM.org>
  11
  12     Extentions to new hisax_pcmcia by Karsten Keil
  13
  14     minor changes to be compatible with kernel 2.4.x
  15     by Jan.Schubert@GMX.li
  16
  17 ======================================================================*/
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/sched.h>
  23 #include <linux/ptrace.h>
  24 #include <linux/slab.h>
  25 #include <linux/string.h>
  26 #include <linux/timer.h>
  27 #include <linux/ioport.h>
  28 #include <asm/io.h>
  29 #include <asm/system.h>
  30
  31 #include <pcmcia/cs_types.h>
  32 #include <pcmcia/cs.h>
  33 #include <pcmcia/cistpl.h>
  34 #include <pcmcia/cisreg.h>
  35 #include <pcmcia/ds.h>
  36 #include "hisax_cfg.h"
  37
  38 MODULE_DESCRIPTION("ISDN4Linux: PCMCIA client driver for Teles PCMCIA cards");
  39 MODULE_AUTHOR("Christof Petig, christof.petig@wtal.de, Karsten Keil, kkeil@suse.de");
  40 MODULE_LICENSE("GPL");
  41
  42 /*
  43    All the PCMCIA modules use PCMCIA_DEBUG to control debugging.  If
  44    you do not define PCMCIA_DEBUG at all, all the debug code will be
  45    left out.  If you compile with PCMCIA_DEBUG=0, the debug code will
  46    be present but disabled -- but it can then be enabled for specific
  47    modules at load time with a 'pc_debug=#' option to insmod.
  48 */
  49
  50 #ifdef PCMCIA_DEBUG
  51 static int pc_debug = PCMCIA_DEBUG;
  52 module_param(pc_debug, int, 0);
  53 #define DEBUG(n, args...) if (pc_debug>(n)) printk(KERN_DEBUG args);
  54 static char *version =
  55 "teles_cs.c 2.10 2002/07/30 22:23:34 kkeil";
  56 #else
  57 #define DEBUG(n, args...)
  58 #endif
  59
  60 /*====================================================================*/
  61
  62 /* Parameters that can be set with 'insmod' */
  63
  64 static int protocol = 2;        /* EURO-ISDN Default */
  65 module_param(protocol, int, 0);
  66
  67 /*====================================================================*/
  68
  69 /*
  70    The event() function is this driver's Card Services event handler.
  71    It will be called by Card Services when an appropriate card status
  72    event is received.  The config() and release() entry points are
  73    used to configure or release a socket, in response to card insertion
  74    and ejection events.  They are invoked from the teles_cs event
  75    handler.
  76 */
  77
  78 static void teles_cs_config(dev_link_t *link);
  79 static void teles_cs_release(dev_link_t *link);
  80 static int teles_cs_event(event_t event, int priority,
  81                           event_callback_args_t *args);
  82
  83 /*
  84    The attach() and detach() entry points are used to create and destroy
  85    "instances" of the driver, where each instance represents everything
  86    needed to manage one actual PCMCIA card.
  87 */
  88
  89 static dev_link_t *teles_attach(void);
  90 static void teles_detach(struct pcmcia_device *p_dev);
  91
  92 /*
  93    The dev_info variable is the "key" that is used to match up this
  94    device driver with appropriate cards, through the card configuration
  95    database.
  96 */
  97
  98 static dev_info_t dev_info = "teles_cs";
  99
 100 /*
 101    A linked list of "instances" of the teles_cs device.  Each actual
 102    PCMCIA card corresponds to one device instance, and is described
 103    by one dev_link_t structure (defined in ds.h).
 104
 105    You may not want to use a linked list for this -- for example, the
 106    memory card driver uses an array of dev_link_t pointers, where minor
 107    device numbers are used to derive the corresponding array index.
 108 */
 109
 110 static dev_link_t *dev_list = NULL;
 111
 112 /*
 113    A dev_link_t structure has fields for most things that are needed
 114    to keep track of a socket, but there will usually be some device
 115    specific information that also needs to be kept track of.  The
 116    'priv' pointer in a dev_link_t structure can be used to point to
 117    a device-specific private data structure, like this.
 118
 119    To simplify the data structure handling, we actually include the
 120    dev_link_t structure in the device's private data structure.
 121
 122    A driver needs to provide a dev_node_t structure for each device
 123    on a card.  In some cases, there is only one device per card (for
 124    example, ethernet cards, modems).  In other cases, there may be
 125    many actual or logical devices (SCSI adapters, memory cards with
 126    multiple partitions).  The dev_node_t structures need to be kept
 127    in a linked list starting at the 'dev' field of a dev_link_t
 128    structure.  We allocate them in the card's private data structure,
 129    because they generally shouldn't be allocated dynamically.
 130    In this case, we also provide a flag to indicate if a device is
 131    "stopped" due to a power management event, or card ejection.  The
 132    device IO routines can use a flag like this to throttle IO to a
 133    card that is not ready to accept it.
 134 */
 135
 136 typedef struct local_info_t {
 137     dev_link_t          link;
 138     dev_node_t          node;
 139     int                 busy;
 140     int                 cardnr;
 141 } local_info_t;
 142
 143 /*======================================================================
 144
 145     teles_attach() creates an "instance" of the driver, allocatingx
 146     local data structures for one device.  The device is registered
 147     with Card Services.
 148
 149     The dev_link structure is initialized, but we don't actually
 150     configure the card at this point -- we wait until we receive a
 151     card insertion event.
 152
 153 ======================================================================*/
 154
 155 static dev_link_t *teles_attach(void)
 156 {
 157     client_reg_t client_reg;
 158     dev_link_t *link;
 159     local_info_t *local;
 160     int ret;
 161
 162     DEBUG(0, "teles_attach()\n");
 163
 164     /* Allocate space for private device-specific data */
 165     local = kmalloc(sizeof(local_info_t), GFP_KERNEL);
 166     if (!local) return NULL;
 167     memset(local, 0, sizeof(local_info_t));
 168     local->cardnr = -1;
 169     link = &local->link; link->priv = local;
 170
 171     /* Interrupt setup */
 172     link->irq.Attributes = IRQ_TYPE_DYNAMIC_SHARING|IRQ_FIRST_SHARED;
 173     link->irq.IRQInfo1 = IRQ_LEVEL_ID|IRQ_SHARE_ID;
 174     link->irq.Handler = NULL;
 175
 176     /*
 177       General socket configuration defaults can go here.  In this
 178       client, we assume very little, and rely on the CIS for almost
 179       everything.  In most clients, many details (i.e., number, sizes,
 180       and attributes of IO windows) are fixed by the nature of the
 181       device, and can be hard-wired here.
 182     */
 183     link->io.NumPorts1 = 96;
 184     link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
 185     link->io.IOAddrLines = 5;
 186
 187     link->conf.Attributes = CONF_ENABLE_IRQ;
 188     link->conf.Vcc = 50;
 189     link->conf.IntType = INT_MEMORY_AND_IO;
 190
 191     /* Register with Card Services */
 192     link->next = dev_list;
 193     dev_list = link;
 194     client_reg.dev_info = &dev_info;
 195     client_reg.Version = 0x0210;
 196     client_reg.event_callback_args.client_data = link;
 197     ret = pcmcia_register_client(&link->handle, &client_reg);
 198     if (ret != CS_SUCCESS) {
 199         cs_error(link->handle, RegisterClient, ret);
 200         teles_detach(link->handle);
 201         return NULL;
 202     }
 203
 204     return link;
 205 } /* teles_attach */
 206
 207 /*======================================================================
 208
 209     This deletes a driver "instance".  The device is de-registered
 210     with Card Services.  If it has been released, all local data
 211     structures are freed.  Otherwise, the structures will be freed
 212     when the device is released.
 213
 214 ======================================================================*/
 215
 216 static void teles_detach(struct pcmcia_device *p_dev)
 217 {
 218     dev_link_t *link = dev_to_instance(p_dev);
 219     dev_link_t **linkp;
 220     local_info_t *info = link->priv;
 221
 222     DEBUG(0, "teles_detach(0x%p)\n", link);
 223
 224     /* Locate device structure */
 225     for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
 226         if (*linkp == link) break;
 227     if (*linkp == NULL)
 228         return;
 229
 230     if (link->state & DEV_CONFIG) {
 231         info->busy = 1;
 232         teles_cs_release(link);
 233     }
 234
 235     /* Unlink device structure and free it */
 236     *linkp = link->next;
 237     kfree(info);
 238
 239 } /* teles_detach */
 240
 241 /*======================================================================
 242
 243     teles_cs_config() is scheduled to run after a CARD_INSERTION event
 244     is received, to configure the PCMCIA socket, and to make the
 245     device available to the system.
 246
 247 ======================================================================*/
 248 static int get_tuple(client_handle_t handle, tuple_t *tuple,
 249                      cisparse_t *parse)
 250 {
 251     int i = pcmcia_get_tuple_data(handle, tuple);
 252     if (i != CS_SUCCESS) return i;
 253     return pcmcia_parse_tuple(handle, tuple, parse);
 254 }
 255
 256 static int first_tuple(client_handle_t handle, tuple_t *tuple,
 257                      cisparse_t *parse)
 258 {
 259     int i = pcmcia_get_first_tuple(handle, tuple);
 260     if (i != CS_SUCCESS) return i;
 261     return get_tuple(handle, tuple, parse);
 262 }
 263
 264 static int next_tuple(client_handle_t handle, tuple_t *tuple,
 265                      cisparse_t *parse)
 266 {
 267     int i = pcmcia_get_next_tuple(handle, tuple);
 268     if (i != CS_SUCCESS) return i;
 269     return get_tuple(handle, tuple, parse);
 270 }
 271
 272 static void teles_cs_config(dev_link_t *link)
 273 {
 274     client_handle_t handle;
 275     tuple_t tuple;
 276     cisparse_t parse;
 277     local_info_t *dev;
 278     int i, j, last_fn;
 279     u_short buf[128];
 280     cistpl_cftable_entry_t *cf = &parse.cftable_entry;
 281     IsdnCard_t icard;
 282
 283     DEBUG(0, "teles_config(0x%p)\n", link);
 284     handle = link->handle;
 285     dev = link->priv;
 286
 287     /*
 288        This reads the card's CONFIG tuple to find its configuration
 289        registers.
 290     */
 291     tuple.DesiredTuple = CISTPL_CONFIG;
 292     tuple.TupleData = (cisdata_t *)buf;
 293     tuple.TupleDataMax = 255;
 294     tuple.TupleOffset = 0;
 295     tuple.Attributes = 0;
 296     i = first_tuple(handle, &tuple, &parse);
 297     if (i != CS_SUCCESS) {
 298         last_fn = ParseTuple;
 299         goto cs_failed;
 300     }
 301     link->conf.ConfigBase = parse.config.base;
 302     link->conf.Present = parse.config.rmask[0];
 303
 304     /* Configure card */
 305     link->state |= DEV_CONFIG;
 306
 307     tuple.TupleData = (cisdata_t *)buf;
 308     tuple.TupleOffset = 0; tuple.TupleDataMax = 255;
 309     tuple.Attributes = 0;
 310     tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
 311     i = first_tuple(handle, &tuple, &parse);
 312     while (i == CS_SUCCESS) {
 313         if ( (cf->io.nwin > 0) && cf->io.win[0].base) {
 314             printk(KERN_INFO "(teles_cs: looks like the 96 model)\n");
 315             link->conf.ConfigIndex = cf->index;
 316             link->io.BasePort1 = cf->io.win[0].base;
 317             i = pcmcia_request_io(link->handle, &link->io);
 318             if (i == CS_SUCCESS) break;
 319         } else {
 320           printk(KERN_INFO "(teles_cs: looks like the 97 model)\n");
 321           link->conf.ConfigIndex = cf->index;
 322           for (i = 0, j = 0x2f0; j > 0x100; j -= 0x10) {
 323             link->io.BasePort1 = j;
 324             i = pcmcia_request_io(link->handle, &link->io);
 325             if (i == CS_SUCCESS) break;
 326           }
 327           break;
 328         }
 329         i = next_tuple(handle, &tuple, &parse);
 330     }
 331
 332     if (i != CS_SUCCESS) {
 333         last_fn = RequestIO;
 334         goto cs_failed;
 335     }
 336
 337     i = pcmcia_request_irq(link->handle, &link->irq);
 338     if (i != CS_SUCCESS) {
 339         link->irq.AssignedIRQ = 0;
 340         last_fn = RequestIRQ;
 341         goto cs_failed;
 342     }
 343
 344     i = pcmcia_request_configuration(link->handle, &link->conf);
 345     if (i != CS_SUCCESS) {
 346       last_fn = RequestConfiguration;
 347       goto cs_failed;
 348     }
 349
 350     /* At this point, the dev_node_t structure(s) should be
 351        initialized and arranged in a linked list at link->dev. *//*  */
 352     sprintf(dev->node.dev_name, "teles");
 353     dev->node.major = dev->node.minor = 0x0;
 354
 355     link->dev = &dev->node;
 356
 357     /* Finally, report what we've done */
 358     printk(KERN_INFO "%s: index 0x%02x: Vcc %d.%d",
 359            dev->node.dev_name, link->conf.ConfigIndex,
 360            link->conf.Vcc/10, link->conf.Vcc%10);
 361     if (link->conf.Vpp1)
 362         printk(", Vpp %d.%d", link->conf.Vpp1/10, link->conf.Vpp1%10);
 363     if (link->conf.Attributes & CONF_ENABLE_IRQ)
 364         printk(", irq %d", link->irq.AssignedIRQ);
 365     if (link->io.NumPorts1)
 366         printk(", io 0x%04x-0x%04x", link->io.BasePort1,
 367                link->io.BasePort1+link->io.NumPorts1-1);
 368     if (link->io.NumPorts2)
 369         printk(" & 0x%04x-0x%04x", link->io.BasePort2,
 370                link->io.BasePort2+link->io.NumPorts2-1);
 371     printk("\n");
 372
 373     link->state &= ~DEV_CONFIG_PENDING;
 374
 375     icard.para[0] = link->irq.AssignedIRQ;
 376     icard.para[1] = link->io.BasePort1;
 377     icard.protocol = protocol;
 378     icard.typ = ISDN_CTYPE_TELESPCMCIA;
 379
 380     i = hisax_init_pcmcia(link, &(((local_info_t*)link->priv)->busy), &icard);
 381     if (i < 0) {
 382         printk(KERN_ERR "teles_cs: failed to initialize Teles PCMCIA %d at i/o %#x\n",
 383                 i, link->io.BasePort1);
 384         teles_cs_release(link);
 385     } else
 386         ((local_info_t*)link->priv)->cardnr = i;
 387
 388     return;
 389 cs_failed:
 390     cs_error(link->handle, last_fn, i);
 391     teles_cs_release(link);
 392 } /* teles_cs_config */
 393
 394 /*======================================================================
 395
 396     After a card is removed, teles_cs_release() will unregister the net
 397     device, and release the PCMCIA configuration.  If the device is
 398     still open, this will be postponed until it is closed.
 399
 400 ======================================================================*/
 401
 402 static void teles_cs_release(dev_link_t *link)
 403 {
 404     local_info_t *local = link->priv;
 405
 406     DEBUG(0, "teles_cs_release(0x%p)\n", link);
 407
 408     if (local) {
 409         if (local->cardnr >= 0) {
 410             /* no unregister function with hisax */
 411             HiSax_closecard(local->cardnr);
 412         }
 413     }
 414     /* Unlink the device chain */
 415     link->dev = NULL;
 416
 417     /* Don't bother checking to see if these succeed or not */
 418     if (link->win)
 419         pcmcia_release_window(link->win);
 420     pcmcia_release_configuration(link->handle);
 421     pcmcia_release_io(link->handle, &link->io);
 422     pcmcia_release_irq(link->handle, &link->irq);
 423     link->state &= ~DEV_CONFIG;
 424 } /* teles_cs_release */
 425
 426 static int teles_suspend(struct pcmcia_device *p_dev)
 427 {
 428         dev_link_t *link = dev_to_instance(p_dev);
 429         local_info_t *dev = link->priv;
 430
 431         link->state |= DEV_SUSPEND;
 432         dev->busy = 1;
 433         if (link->state & DEV_CONFIG)
 434                 pcmcia_release_configuration(link->handle);
 435
 436         return 0;
 437 }
 438
 439 static int teles_resume(struct pcmcia_device *p_dev)
 440 {
 441         dev_link_t *link = dev_to_instance(p_dev);
 442         local_info_t *dev = link->priv;
 443
 444         link->state &= ~DEV_SUSPEND;
 445         if (link->state & DEV_CONFIG)
 446                 pcmcia_request_configuration(link->handle, &link->conf);
 447         dev->busy = 0;
 448
 449         return 0;
 450 }
 451
 452 /*======================================================================
 453
 454     The card status event handler.  Mostly, this schedules other
 455     stuff to run after an event is received.  A CARD_REMOVAL event
 456     also sets some flags to discourage the net drivers from trying
 457     to talk to the card any more.
 458
 459     When a CARD_REMOVAL event is received, we immediately set a flag
 460     to block future accesses to this device.  All the functions that
 461     actually access the device should check this flag to make sure
 462     the card is still present.
 463
 464 ======================================================================*/
 465
 466 static int teles_cs_event(event_t event, int priority,
 467                           event_callback_args_t *args)
 468 {
 469     dev_link_t *link = args->client_data;
 470
 471     DEBUG(1, "teles_cs_event(%d)\n", event);
 472
 473     switch (event) {
 474     case CS_EVENT_CARD_INSERTION:
 475         link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
 476         teles_cs_config(link);
 477         break;
 478     }
 479     return 0;
 480 } /* teles_cs_event */
 481
 482 static struct pcmcia_device_id teles_ids[] = {
 483         PCMCIA_DEVICE_PROD_ID12("TELES", "S0/PC", 0x67b50eae, 0xe9e70119),
 484         PCMCIA_DEVICE_NULL,
 485 };
 486 MODULE_DEVICE_TABLE(pcmcia, teles_ids);
 487
 488 static struct pcmcia_driver teles_cs_driver = {
 489         .owner          = THIS_MODULE,
 490         .drv            = {
 491                 .name   = "teles_cs",
 492         },
 493         .attach         = teles_attach,
 494         .event          = teles_cs_event,
 495         .remove         = teles_detach,
 496         .id_table       = teles_ids,
 497         .suspend        = teles_suspend,
 498         .resume         = teles_resume,
 499 };
 500
 501 static int __init init_teles_cs(void)
 502 {
 503         return pcmcia_register_driver(&teles_cs_driver);
 504 }
 505
 506 static void __exit exit_teles_cs(void)
 507 {
 508         pcmcia_unregister_driver(&teles_cs_driver);
 509         BUG_ON(dev_list != NULL);
 510 }
 511
 512 module_init(init_teles_cs);
 513 module_exit(exit_teles_cs);