drivers/pcmcia/pcmcia_resource.c

   1 /*
   2  * PCMCIA 16-bit resource management functions
   3  *
   4  * The initial developer of the original code is David A. Hinds
   5  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
   6  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
   7  *
   8  * Copyright (C) 1999        David A. Hinds
   9  * Copyright (C) 2004-2005   Dominik Brodowski
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  *
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/delay.h>
  21 #include <linux/pci.h>
  22 #include <linux/device.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/slab.h>
  25
  26 #include <asm/irq.h>
  27
  28 #include <pcmcia/cs_types.h>
  29 #include <pcmcia/ss.h>
  30 #include <pcmcia/cs.h>
  31 #include <pcmcia/cistpl.h>
  32 #include <pcmcia/cisreg.h>
  33 #include <pcmcia/ds.h>
  34
  35 #include "cs_internal.h"
  36
  37
  38 /* Access speed for IO windows */
  39 static int io_speed;
  40 module_param(io_speed, int, 0444);
  41
  42
  43 int pcmcia_validate_mem(struct pcmcia_socket *s)
  44 {
  45         if (s->resource_ops->validate_mem)
  46                 return s->resource_ops->validate_mem(s);
  47         /* if there is no callback, we can assume that everything is OK */
  48         return 0;
  49 }
  50
  51 struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
  52                                  int low, struct pcmcia_socket *s)
  53 {
  54         if (s->resource_ops->find_mem)
  55                 return s->resource_ops->find_mem(base, num, align, low, s);
  56         return NULL;
  57 }
  58
  59
  60 /** alloc_io_space
  61  *
  62  * Special stuff for managing IO windows, because they are scarce
  63  */
  64
  65 static int alloc_io_space(struct pcmcia_socket *s, u_int attr,
  66                           unsigned int *base, unsigned int num, u_int lines)
  67 {
  68         unsigned int align;
  69
  70         align = (*base) ? (lines ? 1<<lines : 0) : 1;
  71         if (align && (align < num)) {
  72                 if (*base) {
  73                         dev_dbg(&s->dev, "odd IO request: num %#x align %#x\n",
  74                                num, align);
  75                         align = 0;
  76                 } else
  77                         while (align && (align < num))
  78                                 align <<= 1;
  79         }
  80         if (*base & ~(align-1)) {
  81                 dev_dbg(&s->dev, "odd IO request: base %#x align %#x\n",
  82                        *base, align);
  83                 align = 0;
  84         }
  85
  86         return s->resource_ops->find_io(s, attr, base, num, align);
  87 } /* alloc_io_space */
  88
  89
  90 static void release_io_space(struct pcmcia_socket *s, unsigned int base,
  91                              unsigned int num)
  92 {
  93         int i;
  94
  95         for (i = 0; i < MAX_IO_WIN; i++) {
  96                 if (!s->io[i].res)
  97                         continue;
  98                 if ((s->io[i].res->start <= base) &&
  99                     (s->io[i].res->end >= base+num-1)) {
 100                         s->io[i].InUse -= num;
 101                         /* Free the window if no one else is using it */
 102                         if (s->io[i].InUse == 0) {
 103                                 release_resource(s->io[i].res);
 104                                 kfree(s->io[i].res);
 105                                 s->io[i].res = NULL;
 106                         }
 107                 }
 108         }
 109 } /* release_io_space */
 110
 111
 112 /** pccard_access_configuration_register
 113  *
 114  * Access_configuration_register() reads and writes configuration
 115  * registers in attribute memory.  Memory window 0 is reserved for
 116  * this and the tuple reading services.
 117  */
 118
 119 int pcmcia_access_configuration_register(struct pcmcia_device *p_dev,
 120                                          conf_reg_t *reg)
 121 {
 122         struct pcmcia_socket *s;
 123         config_t *c;
 124         int addr;
 125         u_char val;
 126         int ret = 0;
 127
 128         if (!p_dev || !p_dev->function_config)
 129                 return -EINVAL;
 130
 131         s = p_dev->socket;
 132
 133         mutex_lock(&s->ops_mutex);
 134         c = p_dev->function_config;
 135
 136         if (!(c->state & CONFIG_LOCKED)) {
 137                 dev_dbg(&s->dev, "Configuration isnt't locked\n");
 138                 mutex_unlock(&s->ops_mutex);
 139                 return -EACCES;
 140         }
 141
 142         addr = (c->ConfigBase + reg->Offset) >> 1;
 143
 144         switch (reg->Action) {
 145         case CS_READ:
 146                 ret = pcmcia_read_cis_mem(s, 1, addr, 1, &val);
 147                 reg->Value = val;
 148                 break;
 149         case CS_WRITE:
 150                 val = reg->Value;
 151                 pcmcia_write_cis_mem(s, 1, addr, 1, &val);
 152                 break;
 153         default:
 154                 dev_dbg(&s->dev, "Invalid conf register request\n");
 155                 ret = -EINVAL;
 156                 break;
 157         }
 158         mutex_unlock(&s->ops_mutex);
 159         return ret;
 160 } /* pcmcia_access_configuration_register */
 161 EXPORT_SYMBOL(pcmcia_access_configuration_register);
 162
 163
 164 int pcmcia_map_mem_page(struct pcmcia_device *p_dev, window_handle_t wh,
 165                         memreq_t *req)
 166 {
 167         struct pcmcia_socket *s = p_dev->socket;
 168         int ret;
 169
 170         wh--;
 171         if (wh >= MAX_WIN)
 172                 return -EINVAL;
 173         if (req->Page != 0) {
 174                 dev_dbg(&s->dev, "failure: requested page is zero\n");
 175                 return -EINVAL;
 176         }
 177         mutex_lock(&s->ops_mutex);
 178         s->win[wh].card_start = req->CardOffset;
 179         ret = s->ops->set_mem_map(s, &s->win[wh]);
 180         if (ret)
 181                 dev_warn(&s->dev, "failed to set_mem_map\n");
 182         mutex_unlock(&s->ops_mutex);
 183         return ret;
 184 } /* pcmcia_map_mem_page */
 185 EXPORT_SYMBOL(pcmcia_map_mem_page);
 186
 187
 188 /** pcmcia_modify_configuration
 189  *
 190  * Modify a locked socket configuration
 191  */
 192 int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
 193                                 modconf_t *mod)
 194 {
 195         struct pcmcia_socket *s;
 196         config_t *c;
 197         int ret;
 198
 199         s = p_dev->socket;
 200
 201         mutex_lock(&s->ops_mutex);
 202         c = p_dev->function_config;
 203
 204         if (!(s->state & SOCKET_PRESENT)) {
 205                 dev_dbg(&s->dev, "No card present\n");
 206                 ret = -ENODEV;
 207                 goto unlock;
 208         }
 209         if (!(c->state & CONFIG_LOCKED)) {
 210                 dev_dbg(&s->dev, "Configuration isnt't locked\n");
 211                 ret = -EACCES;
 212                 goto unlock;
 213         }
 214
 215         if (mod->Attributes & (CONF_IRQ_CHANGE_VALID | CONF_VCC_CHANGE_VALID)) {
 216                 dev_dbg(&s->dev,
 217                         "changing Vcc or IRQ is not allowed at this time\n");
 218                 ret = -EINVAL;
 219                 goto unlock;
 220         }
 221
 222         /* We only allow changing Vpp1 and Vpp2 to the same value */
 223         if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) &&
 224             (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
 225                 if (mod->Vpp1 != mod->Vpp2) {
 226                         dev_dbg(&s->dev, "Vpp1 and Vpp2 must be the same\n");
 227                         ret = -EINVAL;
 228                         goto unlock;
 229                 }
 230                 s->socket.Vpp = mod->Vpp1;
 231                 if (s->ops->set_socket(s, &s->socket)) {
 232                         dev_printk(KERN_WARNING, &s->dev,
 233                                    "Unable to set VPP\n");
 234                         ret = -EIO;
 235                         goto unlock;
 236                 }
 237         } else if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) ||
 238                    (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
 239                 dev_dbg(&s->dev, "changing Vcc is not allowed at this time\n");
 240                 ret = -EINVAL;
 241                 goto unlock;
 242         }
 243
 244         if (mod->Attributes & CONF_IO_CHANGE_WIDTH) {
 245                 pccard_io_map io_off = { 0, 0, 0, 0, 1 };
 246                 pccard_io_map io_on;
 247                 int i;
 248
 249                 io_on.speed = io_speed;
 250                 for (i = 0; i < MAX_IO_WIN; i++) {
 251                         if (!s->io[i].res)
 252                                 continue;
 253                         io_off.map = i;
 254                         io_on.map = i;
 255
 256                         io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8;
 257                         io_on.start = s->io[i].res->start;
 258                         io_on.stop = s->io[i].res->end;
 259
 260                         s->ops->set_io_map(s, &io_off);
 261                         mdelay(40);
 262                         s->ops->set_io_map(s, &io_on);
 263                 }
 264         }
 265         ret = 0;
 266 unlock:
 267         mutex_unlock(&s->ops_mutex);
 268
 269         return ret;
 270 } /* modify_configuration */
 271 EXPORT_SYMBOL(pcmcia_modify_configuration);
 272
 273
 274 int pcmcia_release_configuration(struct pcmcia_device *p_dev)
 275 {
 276         pccard_io_map io = { 0, 0, 0, 0, 1 };
 277         struct pcmcia_socket *s = p_dev->socket;
 278         config_t *c;
 279         int i;
 280
 281         mutex_lock(&s->ops_mutex);
 282         c = p_dev->function_config;
 283         if (p_dev->_locked) {
 284                 p_dev->_locked = 0;
 285                 if (--(s->lock_count) == 0) {
 286                         s->socket.flags = SS_OUTPUT_ENA;   /* Is this correct? */
 287                         s->socket.Vpp = 0;
 288                         s->socket.io_irq = 0;
 289                         s->ops->set_socket(s, &s->socket);
 290                 }
 291         }
 292         if (c->state & CONFIG_LOCKED) {
 293                 c->state &= ~CONFIG_LOCKED;
 294                 if (c->state & CONFIG_IO_REQ)
 295                         for (i = 0; i < MAX_IO_WIN; i++) {
 296                                 if (!s->io[i].res)
 297                                         continue;
 298                                 s->io[i].Config--;
 299                                 if (s->io[i].Config != 0)
 300                                         continue;
 301                                 io.map = i;
 302                                 s->ops->set_io_map(s, &io);
 303                         }
 304         }
 305         mutex_unlock(&s->ops_mutex);
 306
 307         return 0;
 308 } /* pcmcia_release_configuration */
 309
 310
 311 /** pcmcia_release_io
 312  *
 313  * Release_io() releases the I/O ranges allocated by a client.  This
 314  * may be invoked some time after a card ejection has already dumped
 315  * the actual socket configuration, so if the client is "stale", we
 316  * don't bother checking the port ranges against the current socket
 317  * values.
 318  */
 319 static int pcmcia_release_io(struct pcmcia_device *p_dev, io_req_t *req)
 320 {
 321         struct pcmcia_socket *s = p_dev->socket;
 322         int ret = -EINVAL;
 323         config_t *c;
 324
 325         mutex_lock(&s->ops_mutex);
 326         c = p_dev->function_config;
 327
 328         if (!p_dev->_io)
 329                 goto out;
 330
 331         p_dev->_io = 0;
 332
 333         if ((c->io.BasePort1 != req->BasePort1) ||
 334             (c->io.NumPorts1 != req->NumPorts1) ||
 335             (c->io.BasePort2 != req->BasePort2) ||
 336             (c->io.NumPorts2 != req->NumPorts2))
 337                 goto out;
 338
 339         c->state &= ~CONFIG_IO_REQ;
 340
 341         release_io_space(s, req->BasePort1, req->NumPorts1);
 342         if (req->NumPorts2)
 343                 release_io_space(s, req->BasePort2, req->NumPorts2);
 344
 345 out:
 346         mutex_unlock(&s->ops_mutex);
 347
 348         return ret;
 349 } /* pcmcia_release_io */
 350
 351
 352 int pcmcia_release_window(struct pcmcia_device *p_dev, window_handle_t wh)
 353 {
 354         struct pcmcia_socket *s = p_dev->socket;
 355         pccard_mem_map *win;
 356
 357         wh--;
 358         if (wh >= MAX_WIN)
 359                 return -EINVAL;
 360
 361         mutex_lock(&s->ops_mutex);
 362         win = &s->win[wh];
 363
 364         if (!(p_dev->_win & CLIENT_WIN_REQ(wh))) {
 365                 dev_dbg(&s->dev, "not releasing unknown window\n");
 366                 mutex_unlock(&s->ops_mutex);
 367                 return -EINVAL;
 368         }
 369
 370         /* Shut down memory window */
 371         win->flags &= ~MAP_ACTIVE;
 372         s->ops->set_mem_map(s, win);
 373         s->state &= ~SOCKET_WIN_REQ(wh);
 374
 375         /* Release system memory */
 376         if (win->res) {
 377                 release_resource(win->res);
 378                 kfree(win->res);
 379                 win->res = NULL;
 380         }
 381         p_dev->_win &= ~CLIENT_WIN_REQ(wh);
 382         mutex_unlock(&s->ops_mutex);
 383
 384         return 0;
 385 } /* pcmcia_release_window */
 386 EXPORT_SYMBOL(pcmcia_release_window);
 387
 388
 389 int pcmcia_request_configuration(struct pcmcia_device *p_dev,
 390                                  config_req_t *req)
 391 {
 392         int i;
 393         u_int base;
 394         struct pcmcia_socket *s = p_dev->socket;
 395         config_t *c;
 396         pccard_io_map iomap;
 397
 398         if (!(s->state & SOCKET_PRESENT))
 399                 return -ENODEV;
 400
 401         if (req->IntType & INT_CARDBUS) {
 402                 dev_dbg(&s->dev, "IntType may not be INT_CARDBUS\n");
 403                 return -EINVAL;
 404         }
 405
 406         mutex_lock(&s->ops_mutex);
 407         c = p_dev->function_config;
 408         if (c->state & CONFIG_LOCKED) {
 409                 mutex_unlock(&s->ops_mutex);
 410                 dev_dbg(&s->dev, "Configuration is locked\n");
 411                 return -EACCES;
 412         }
 413
 414         /* Do power control.  We don't allow changes in Vcc. */
 415         s->socket.Vpp = req->Vpp;
 416         if (s->ops->set_socket(s, &s->socket)) {
 417                 mutex_unlock(&s->ops_mutex);
 418                 dev_printk(KERN_WARNING, &s->dev,
 419                            "Unable to set socket state\n");
 420                 return -EINVAL;
 421         }
 422
 423         /* Pick memory or I/O card, DMA mode, interrupt */
 424         c->IntType = req->IntType;
 425         c->Attributes = req->Attributes;
 426         if (req->IntType & INT_MEMORY_AND_IO)
 427                 s->socket.flags |= SS_IOCARD;
 428         if (req->IntType & INT_ZOOMED_VIDEO)
 429                 s->socket.flags |= SS_ZVCARD | SS_IOCARD;
 430         if (req->Attributes & CONF_ENABLE_DMA)
 431                 s->socket.flags |= SS_DMA_MODE;
 432         if (req->Attributes & CONF_ENABLE_SPKR)
 433                 s->socket.flags |= SS_SPKR_ENA;
 434         if (req->Attributes & CONF_ENABLE_IRQ)
 435                 s->socket.io_irq = s->pcmcia_irq;
 436         else
 437                 s->socket.io_irq = 0;
 438         s->ops->set_socket(s, &s->socket);
 439         s->lock_count++;
 440
 441         /* Set up CIS configuration registers */
 442         base = c->ConfigBase = req->ConfigBase;
 443         c->CardValues = req->Present;
 444         if (req->Present & PRESENT_COPY) {
 445                 c->Copy = req->Copy;
 446                 pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &c->Copy);
 447         }
 448         if (req->Present & PRESENT_OPTION) {
 449                 if (s->functions == 1) {
 450                         c->Option = req->ConfigIndex & COR_CONFIG_MASK;
 451                 } else {
 452                         c->Option = req->ConfigIndex & COR_MFC_CONFIG_MASK;
 453                         c->Option |= COR_FUNC_ENA|COR_IREQ_ENA;
 454                         if (req->Present & PRESENT_IOBASE_0)
 455                                 c->Option |= COR_ADDR_DECODE;
 456                 }
 457                 if ((req->Attributes & CONF_ENABLE_IRQ) &&
 458                         !(req->Attributes & CONF_ENABLE_PULSE_IRQ))
 459                         c->Option |= COR_LEVEL_REQ;
 460                 pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &c->Option);
 461                 mdelay(40);
 462         }
 463         if (req->Present & PRESENT_STATUS) {
 464                 c->Status = req->Status;
 465                 pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &c->Status);
 466         }
 467         if (req->Present & PRESENT_PIN_REPLACE) {
 468                 c->Pin = req->Pin;
 469                 pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &c->Pin);
 470         }
 471         if (req->Present & PRESENT_EXT_STATUS) {
 472                 c->ExtStatus = req->ExtStatus;
 473                 pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1, &c->ExtStatus);
 474         }
 475         if (req->Present & PRESENT_IOBASE_0) {
 476                 u_char b = c->io.BasePort1 & 0xff;
 477                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b);
 478                 b = (c->io.BasePort1 >> 8) & 0xff;
 479                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b);
 480         }
 481         if (req->Present & PRESENT_IOSIZE) {
 482                 u_char b = c->io.NumPorts1 + c->io.NumPorts2 - 1;
 483                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b);
 484         }
 485
 486         /* Configure I/O windows */
 487         if (c->state & CONFIG_IO_REQ) {
 488                 iomap.speed = io_speed;
 489                 for (i = 0; i < MAX_IO_WIN; i++)
 490                         if (s->io[i].res) {
 491                                 iomap.map = i;
 492                                 iomap.flags = MAP_ACTIVE;
 493                                 switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) {
 494                                 case IO_DATA_PATH_WIDTH_16:
 495                                         iomap.flags |= MAP_16BIT; break;
 496                                 case IO_DATA_PATH_WIDTH_AUTO:
 497                                         iomap.flags |= MAP_AUTOSZ; break;
 498                                 default:
 499                                         break;
 500                                 }
 501                                 iomap.start = s->io[i].res->start;
 502                                 iomap.stop = s->io[i].res->end;
 503                                 s->ops->set_io_map(s, &iomap);
 504                                 s->io[i].Config++;
 505                         }
 506         }
 507
 508         c->state |= CONFIG_LOCKED;
 509         p_dev->_locked = 1;
 510         mutex_unlock(&s->ops_mutex);
 511         return 0;
 512 } /* pcmcia_request_configuration */
 513 EXPORT_SYMBOL(pcmcia_request_configuration);
 514
 515
 516 /** pcmcia_request_io
 517  *
 518  * Request_io() reserves ranges of port addresses for a socket.
 519  * I have not implemented range sharing or alias addressing.
 520  */
 521 int pcmcia_request_io(struct pcmcia_device *p_dev, io_req_t *req)
 522 {
 523         struct pcmcia_socket *s = p_dev->socket;
 524         config_t *c;
 525         int ret = -EINVAL;
 526
 527         mutex_lock(&s->ops_mutex);
 528
 529         if (!(s->state & SOCKET_PRESENT)) {
 530                 dev_dbg(&s->dev, "No card present\n");
 531                 goto out;
 532         }
 533
 534         if (!req)
 535                 goto out;
 536
 537         c = p_dev->function_config;
 538         if (c->state & CONFIG_LOCKED) {
 539                 dev_dbg(&s->dev, "Configuration is locked\n");
 540                 goto out;
 541         }
 542         if (c->state & CONFIG_IO_REQ) {
 543                 dev_dbg(&s->dev, "IO already configured\n");
 544                 goto out;
 545         }
 546         if (req->Attributes1 & (IO_SHARED | IO_FORCE_ALIAS_ACCESS)) {
 547                 dev_dbg(&s->dev, "bad attribute setting for IO region 1\n");
 548                 goto out;
 549         }
 550         if ((req->NumPorts2 > 0) &&
 551             (req->Attributes2 & (IO_SHARED | IO_FORCE_ALIAS_ACCESS))) {
 552                 dev_dbg(&s->dev, "bad attribute setting for IO region 2\n");
 553                 goto out;
 554         }
 555
 556         dev_dbg(&s->dev, "trying to allocate resource 1\n");
 557         ret = alloc_io_space(s, req->Attributes1, &req->BasePort1,
 558                              req->NumPorts1, req->IOAddrLines);
 559         if (ret) {
 560                 dev_dbg(&s->dev, "allocation of resource 1 failed\n");
 561                 goto out;
 562         }
 563
 564         if (req->NumPorts2) {
 565                 dev_dbg(&s->dev, "trying to allocate resource 2\n");
 566                 ret = alloc_io_space(s, req->Attributes2, &req->BasePort2,
 567                                      req->NumPorts2, req->IOAddrLines);
 568                 if (ret) {
 569                         dev_dbg(&s->dev, "allocation of resource 2 failed\n");
 570                         release_io_space(s, req->BasePort1, req->NumPorts1);
 571                         goto out;
 572                 }
 573         }
 574
 575         c->io = *req;
 576         c->state |= CONFIG_IO_REQ;
 577         p_dev->_io = 1;
 578         dev_dbg(&s->dev, "allocating resources succeeded: %d\n", ret);
 579
 580 out:
 581         mutex_unlock(&s->ops_mutex);
 582
 583         return ret;
 584 } /* pcmcia_request_io */
 585 EXPORT_SYMBOL(pcmcia_request_io);
 586
 587
 588 /**
 589  * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device
 590  *
 591  * pcmcia_request_irq() is a wrapper around request_irq which will allow
 592  * the PCMCIA core to clean up the registration in pcmcia_disable_device().
 593  * Drivers are free to use request_irq() directly, but then they need to
 594  * call free_irq themselfves, too. Also, only IRQF_SHARED capable IRQ
 595  * handlers are allowed.
 596  */
 597 int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev,
 598                                     irq_handler_t handler)
 599 {
 600         int ret;
 601
 602         if (!p_dev->irq)
 603                 return -EINVAL;
 604
 605         ret = request_irq(p_dev->irq, handler, IRQF_SHARED,
 606                         p_dev->devname, p_dev->priv);
 607         if (!ret)
 608                 p_dev->_irq = 1;
 609
 610         return ret;
 611 }
 612 EXPORT_SYMBOL(pcmcia_request_irq);
 613
 614
 615 /**
 616  * pcmcia_request_exclusive_irq() - attempt to request an exclusive IRQ first
 617  *
 618  * pcmcia_request_exclusive_irq() is a wrapper around request_irq which
 619  * attempts first to request an exclusive IRQ. If it fails, it also accepts
 620  * a shared IRQ, but prints out a warning. PCMCIA drivers should allow for
 621  * IRQ sharing and either use request_irq directly (then they need to call
 622  * free_irq themselves, too), or the pcmcia_request_irq() function.
 623  */
 624 int __must_check
 625 __pcmcia_request_exclusive_irq(struct pcmcia_device *p_dev,
 626                         irq_handler_t handler)
 627 {
 628         int ret;
 629
 630         if (!p_dev->irq)
 631                 return -EINVAL;
 632
 633         ret = request_irq(p_dev->irq, handler, 0, p_dev->devname, p_dev->priv);
 634         if (ret) {
 635                 ret = pcmcia_request_irq(p_dev, handler);
 636                 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: "
 637                         "request for exclusive IRQ could not be fulfilled.\n");
 638                 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver "
 639                         "needs updating to supported shared IRQ lines.\n");
 640         }
 641         if (ret)
 642                 dev_printk(KERN_INFO, &p_dev->dev, "request_irq() failed\n");
 643         else
 644                 p_dev->_irq = 1;
 645
 646         return ret;
 647 } /* pcmcia_request_exclusive_irq */
 648 EXPORT_SYMBOL(__pcmcia_request_exclusive_irq);
 649
 650
 651 #ifdef CONFIG_PCMCIA_PROBE
 652
 653 /* mask of IRQs already reserved by other cards, we should avoid using them */
 654 static u8 pcmcia_used_irq[NR_IRQS];
 655
 656 static irqreturn_t test_action(int cpl, void *dev_id)
 657 {
 658         return IRQ_NONE;
 659 }
 660
 661 /**
 662  * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used
 663  * @p_dev - the associated PCMCIA device
 664  *
 665  * locking note: must be called with ops_mutex locked.
 666  */
 667 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
 668 {
 669         struct pcmcia_socket *s = p_dev->socket;
 670         unsigned int try, irq;
 671         u32 mask = s->irq_mask;
 672         int ret = -ENODEV;
 673
 674         for (try = 0; try < 64; try++) {
 675                 irq = try % 32;
 676
 677                 /* marked as available by driver, not blocked by userspace? */
 678                 if (!((mask >> irq) & 1))
 679                         continue;
 680
 681                 /* avoid an IRQ which is already used by another PCMCIA card */
 682                 if ((try < 32) && pcmcia_used_irq[irq])
 683                         continue;
 684
 685                 /* register the correct driver, if possible, to check whether
 686                  * registering a dummy handle works, i.e. if the IRQ isn't
 687                  * marked as used by the kernel resource management core */
 688                 ret = request_irq(irq, test_action, type, p_dev->devname,
 689                                   p_dev);
 690                 if (!ret) {
 691                         free_irq(irq, p_dev);
 692                         p_dev->irq = s->pcmcia_irq = irq;
 693                         pcmcia_used_irq[irq]++;
 694                         break;
 695                 }
 696         }
 697
 698         return ret;
 699 }
 700
 701 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
 702 {
 703         pcmcia_used_irq[s->pcmcia_irq]--;
 704         s->pcmcia_irq = 0;
 705 }
 706
 707 #else /* CONFIG_PCMCIA_PROBE */
 708
 709 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
 710 {
 711         return -EINVAL;
 712 }
 713
 714 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
 715 {
 716         s->pcmcia_irq = 0;
 717         return;
 718 }
 719
 720 #endif  /* CONFIG_PCMCIA_PROBE */
 721
 722
 723 /**
 724  * pcmcia_setup_irq() - determine IRQ to be used for device
 725  * @p_dev - the associated PCMCIA device
 726  *
 727  * locking note: must be called with ops_mutex locked.
 728  */
 729 int pcmcia_setup_irq(struct pcmcia_device *p_dev)
 730 {
 731         struct pcmcia_socket *s = p_dev->socket;
 732
 733         if (p_dev->irq)
 734                 return 0;
 735
 736         /* already assigned? */
 737         if (s->pcmcia_irq) {
 738                 p_dev->irq = s->pcmcia_irq;
 739                 return 0;
 740         }
 741
 742         /* prefer an exclusive ISA irq */
 743         if (!pcmcia_setup_isa_irq(p_dev, 0))
 744                 return 0;
 745
 746         /* but accept a shared ISA irq */
 747         if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED))
 748                 return 0;
 749
 750         /* but use the PCI irq otherwise */
 751         if (s->pci_irq) {
 752                 p_dev->irq = s->pcmcia_irq = s->pci_irq;
 753                 return 0;
 754         }
 755
 756         return -EINVAL;
 757 }
 758
 759
 760 /** pcmcia_request_window
 761  *
 762  * Request_window() establishes a mapping between card memory space
 763  * and system memory space.
 764  */
 765 int pcmcia_request_window(struct pcmcia_device *p_dev, win_req_t *req, window_handle_t *wh)
 766 {
 767         struct pcmcia_socket *s = p_dev->socket;
 768         pccard_mem_map *win;
 769         u_long align;
 770         int w;
 771
 772         if (!(s->state & SOCKET_PRESENT)) {
 773                 dev_dbg(&s->dev, "No card present\n");
 774                 return -ENODEV;
 775         }
 776         if (req->Attributes & (WIN_PAGED | WIN_SHARED)) {
 777                 dev_dbg(&s->dev, "bad attribute setting for iomem region\n");
 778                 return -EINVAL;
 779         }
 780
 781         /* Window size defaults to smallest available */
 782         if (req->Size == 0)
 783                 req->Size = s->map_size;
 784         align = (((s->features & SS_CAP_MEM_ALIGN) ||
 785                   (req->Attributes & WIN_STRICT_ALIGN)) ?
 786                  req->Size : s->map_size);
 787         if (req->Size & (s->map_size-1)) {
 788                 dev_dbg(&s->dev, "invalid map size\n");
 789                 return -EINVAL;
 790         }
 791         if ((req->Base && (s->features & SS_CAP_STATIC_MAP)) ||
 792             (req->Base & (align-1))) {
 793                 dev_dbg(&s->dev, "invalid base address\n");
 794                 return -EINVAL;
 795         }
 796         if (req->Base)
 797                 align = 0;
 798
 799         /* Allocate system memory window */
 800         for (w = 0; w < MAX_WIN; w++)
 801                 if (!(s->state & SOCKET_WIN_REQ(w)))
 802                         break;
 803         if (w == MAX_WIN) {
 804                 dev_dbg(&s->dev, "all windows are used already\n");
 805                 return -EINVAL;
 806         }
 807
 808         mutex_lock(&s->ops_mutex);
 809         win = &s->win[w];
 810
 811         if (!(s->features & SS_CAP_STATIC_MAP)) {
 812                 win->res = pcmcia_find_mem_region(req->Base, req->Size, align,
 813                                                       (req->Attributes & WIN_MAP_BELOW_1MB), s);
 814                 if (!win->res) {
 815                         dev_dbg(&s->dev, "allocating mem region failed\n");
 816                         mutex_unlock(&s->ops_mutex);
 817                         return -EINVAL;
 818                 }
 819         }
 820         p_dev->_win |= CLIENT_WIN_REQ(w);
 821
 822         /* Configure the socket controller */
 823         win->map = w+1;
 824         win->flags = 0;
 825         win->speed = req->AccessSpeed;
 826         if (req->Attributes & WIN_MEMORY_TYPE)
 827                 win->flags |= MAP_ATTRIB;
 828         if (req->Attributes & WIN_ENABLE)
 829                 win->flags |= MAP_ACTIVE;
 830         if (req->Attributes & WIN_DATA_WIDTH_16)
 831                 win->flags |= MAP_16BIT;
 832         if (req->Attributes & WIN_USE_WAIT)
 833                 win->flags |= MAP_USE_WAIT;
 834         win->card_start = 0;
 835
 836         if (s->ops->set_mem_map(s, win) != 0) {
 837                 dev_dbg(&s->dev, "failed to set memory mapping\n");
 838                 mutex_unlock(&s->ops_mutex);
 839                 return -EIO;
 840         }
 841         s->state |= SOCKET_WIN_REQ(w);
 842
 843         /* Return window handle */
 844         if (s->features & SS_CAP_STATIC_MAP)
 845                 req->Base = win->static_start;
 846         else
 847                 req->Base = win->res->start;
 848
 849         mutex_unlock(&s->ops_mutex);
 850         *wh = w + 1;
 851
 852         return 0;
 853 } /* pcmcia_request_window */
 854 EXPORT_SYMBOL(pcmcia_request_window);
 855
 856 void pcmcia_disable_device(struct pcmcia_device *p_dev)
 857 {
 858         pcmcia_release_configuration(p_dev);
 859         pcmcia_release_io(p_dev, &p_dev->io);
 860         if (p_dev->_irq)
 861                 free_irq(p_dev->irq, p_dev->priv);
 862         if (p_dev->win)
 863                 pcmcia_release_window(p_dev, p_dev->win);
 864 }
 865 EXPORT_SYMBOL(pcmcia_disable_device);