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/ss.h>
  29 #include <pcmcia/cs.h>
  30 #include <pcmcia/cistpl.h>
  31 #include <pcmcia/cisreg.h>
  32 #include <pcmcia/ds.h>
  33
  34 #include "cs_internal.h"
  35
  36
  37 /* Access speed for IO windows */
  38 static int io_speed;
  39 module_param(io_speed, int, 0444);
  40
  41
  42 int pcmcia_validate_mem(struct pcmcia_socket *s)
  43 {
  44         if (s->resource_ops->validate_mem)
  45                 return s->resource_ops->validate_mem(s);
  46         /* if there is no callback, we can assume that everything is OK */
  47         return 0;
  48 }
  49
  50 struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
  51                                  int low, struct pcmcia_socket *s)
  52 {
  53         if (s->resource_ops->find_mem)
  54                 return s->resource_ops->find_mem(base, num, align, low, s);
  55         return NULL;
  56 }
  57
  58
  59 static void release_io_space(struct pcmcia_socket *s, struct resource *res)
  60 {
  61         resource_size_t num = resource_size(res);
  62         int i;
  63
  64         dev_dbg(&s->dev, "release_io_space for %pR\n", res);
  65
  66         for (i = 0; i < MAX_IO_WIN; i++) {
  67                 if (!s->io[i].res)
  68                         continue;
  69                 if ((s->io[i].res->start <= res->start) &&
  70                     (s->io[i].res->end >= res->end)) {
  71                         s->io[i].InUse -= num;
  72                         if (res->parent)
  73                                 release_resource(res);
  74                         res->start = res->end = 0;
  75                         res->flags = IORESOURCE_IO;
  76                         /* Free the window if no one else is using it */
  77                         if (s->io[i].InUse == 0) {
  78                                 release_resource(s->io[i].res);
  79                                 kfree(s->io[i].res);
  80                                 s->io[i].res = NULL;
  81                         }
  82                 }
  83         }
  84 } /* release_io_space */
  85
  86 /** alloc_io_space
  87  *
  88  * Special stuff for managing IO windows, because they are scarce
  89  */
  90 static int alloc_io_space(struct pcmcia_socket *s, struct resource *res,
  91                         unsigned int lines)
  92 {
  93         unsigned int align;
  94         unsigned int base = res->start;
  95         unsigned int num = res->end;
  96         int ret;
  97
  98         res->flags |= IORESOURCE_IO;
  99
 100         dev_dbg(&s->dev, "alloc_io_space request for %pR, %d lines\n",
 101                 res, lines);
 102
 103         align = base ? (lines ? 1<<lines : 0) : 1;
 104         if (align && (align < num)) {
 105                 if (base) {
 106                         dev_dbg(&s->dev, "odd IO request\n");
 107                         align = 0;
 108                 } else
 109                         while (align && (align < num))
 110                                 align <<= 1;
 111         }
 112         if (base & ~(align-1)) {
 113                 dev_dbg(&s->dev, "odd IO request\n");
 114                 align = 0;
 115         }
 116
 117         ret = s->resource_ops->find_io(s, res->flags, &base, num, align,
 118                                 &res->parent);
 119         if (ret) {
 120                 dev_dbg(&s->dev, "alloc_io_space request failed (%d)\n", ret);
 121                 return -EINVAL;
 122         }
 123
 124         res->start = base;
 125         res->end = res->start + num - 1;
 126
 127         if (res->parent) {
 128                 ret = request_resource(res->parent, res);
 129                 if (ret) {
 130                         dev_warn(&s->dev,
 131                                 "request_resource %pR failed: %d\n", res, ret);
 132                         res->parent = NULL;
 133                         release_io_space(s, res);
 134                 }
 135         }
 136         dev_dbg(&s->dev, "alloc_io_space request result %d: %pR\n", ret, res);
 137         return ret;
 138 } /* alloc_io_space */
 139
 140
 141 /**
 142  * pcmcia_access_config() - read or write card configuration registers
 143  *
 144  * pcmcia_access_config() reads and writes configuration registers in
 145  * attribute memory.  Memory window 0 is reserved for this and the tuple
 146  * reading services. Drivers must use pcmcia_read_config_byte() or
 147  * pcmcia_write_config_byte().
 148  */
 149 static int pcmcia_access_config(struct pcmcia_device *p_dev,
 150                                 off_t where, u8 *val,
 151                                 int (*accessf) (struct pcmcia_socket *s,
 152                                                 int attr, unsigned int addr,
 153                                                 unsigned int len, void *ptr))
 154 {
 155         struct pcmcia_socket *s;
 156         config_t *c;
 157         int addr;
 158         int ret = 0;
 159
 160         s = p_dev->socket;
 161
 162         mutex_lock(&s->ops_mutex);
 163         c = p_dev->function_config;
 164
 165         if (!(c->state & CONFIG_LOCKED)) {
 166                 dev_dbg(&s->dev, "Configuration isnt't locked\n");
 167                 mutex_unlock(&s->ops_mutex);
 168                 return -EACCES;
 169         }
 170
 171         addr = (c->ConfigBase + where) >> 1;
 172
 173         ret = accessf(s, 1, addr, 1, val);
 174
 175         mutex_unlock(&s->ops_mutex);
 176
 177         return ret;
 178 } /* pcmcia_access_config */
 179
 180
 181 /**
 182  * pcmcia_read_config_byte() - read a byte from a card configuration register
 183  *
 184  * pcmcia_read_config_byte() reads a byte from a configuration register in
 185  * attribute memory.
 186  */
 187 int pcmcia_read_config_byte(struct pcmcia_device *p_dev, off_t where, u8 *val)
 188 {
 189         return pcmcia_access_config(p_dev, where, val, pcmcia_read_cis_mem);
 190 }
 191 EXPORT_SYMBOL(pcmcia_read_config_byte);
 192
 193
 194 /**
 195  * pcmcia_write_config_byte() - write a byte to a card configuration register
 196  *
 197  * pcmcia_write_config_byte() writes a byte to a configuration register in
 198  * attribute memory.
 199  */
 200 int pcmcia_write_config_byte(struct pcmcia_device *p_dev, off_t where, u8 val)
 201 {
 202         return pcmcia_access_config(p_dev, where, &val, pcmcia_write_cis_mem);
 203 }
 204 EXPORT_SYMBOL(pcmcia_write_config_byte);
 205
 206
 207 int pcmcia_map_mem_page(struct pcmcia_device *p_dev, window_handle_t wh,
 208                         unsigned int offset)
 209 {
 210         struct pcmcia_socket *s = p_dev->socket;
 211         struct resource *res = wh;
 212         unsigned int w;
 213         int ret;
 214
 215         w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1;
 216         if (w >= MAX_WIN)
 217                 return -EINVAL;
 218
 219         mutex_lock(&s->ops_mutex);
 220         s->win[w].card_start = offset;
 221         ret = s->ops->set_mem_map(s, &s->win[w]);
 222         if (ret)
 223                 dev_warn(&s->dev, "failed to set_mem_map\n");
 224         mutex_unlock(&s->ops_mutex);
 225         return ret;
 226 } /* pcmcia_map_mem_page */
 227 EXPORT_SYMBOL(pcmcia_map_mem_page);
 228
 229
 230 /** pcmcia_modify_configuration
 231  *
 232  * Modify a locked socket configuration
 233  */
 234 int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
 235                                 modconf_t *mod)
 236 {
 237         struct pcmcia_socket *s;
 238         config_t *c;
 239         int ret;
 240
 241         s = p_dev->socket;
 242
 243         mutex_lock(&s->ops_mutex);
 244         c = p_dev->function_config;
 245
 246         if (!(s->state & SOCKET_PRESENT)) {
 247                 dev_dbg(&s->dev, "No card present\n");
 248                 ret = -ENODEV;
 249                 goto unlock;
 250         }
 251         if (!(c->state & CONFIG_LOCKED)) {
 252                 dev_dbg(&s->dev, "Configuration isnt't locked\n");
 253                 ret = -EACCES;
 254                 goto unlock;
 255         }
 256
 257         if (mod->Attributes & (CONF_IRQ_CHANGE_VALID | CONF_VCC_CHANGE_VALID)) {
 258                 dev_dbg(&s->dev,
 259                         "changing Vcc or IRQ is not allowed at this time\n");
 260                 ret = -EINVAL;
 261                 goto unlock;
 262         }
 263
 264         /* We only allow changing Vpp1 and Vpp2 to the same value */
 265         if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) &&
 266             (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
 267                 if (mod->Vpp1 != mod->Vpp2) {
 268                         dev_dbg(&s->dev, "Vpp1 and Vpp2 must be the same\n");
 269                         ret = -EINVAL;
 270                         goto unlock;
 271                 }
 272                 s->socket.Vpp = mod->Vpp1;
 273                 if (s->ops->set_socket(s, &s->socket)) {
 274                         dev_printk(KERN_WARNING, &s->dev,
 275                                    "Unable to set VPP\n");
 276                         ret = -EIO;
 277                         goto unlock;
 278                 }
 279         } else if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) ||
 280                    (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
 281                 dev_dbg(&s->dev, "changing Vcc is not allowed at this time\n");
 282                 ret = -EINVAL;
 283                 goto unlock;
 284         }
 285
 286         if (mod->Attributes & CONF_IO_CHANGE_WIDTH) {
 287                 pccard_io_map io_off = { 0, 0, 0, 0, 1 };
 288                 pccard_io_map io_on;
 289                 int i;
 290
 291                 io_on.speed = io_speed;
 292                 for (i = 0; i < MAX_IO_WIN; i++) {
 293                         if (!s->io[i].res)
 294                                 continue;
 295                         io_off.map = i;
 296                         io_on.map = i;
 297
 298                         io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8;
 299                         io_on.start = s->io[i].res->start;
 300                         io_on.stop = s->io[i].res->end;
 301
 302                         s->ops->set_io_map(s, &io_off);
 303                         mdelay(40);
 304                         s->ops->set_io_map(s, &io_on);
 305                 }
 306         }
 307         ret = 0;
 308 unlock:
 309         mutex_unlock(&s->ops_mutex);
 310
 311         return ret;
 312 } /* modify_configuration */
 313 EXPORT_SYMBOL(pcmcia_modify_configuration);
 314
 315
 316 int pcmcia_release_configuration(struct pcmcia_device *p_dev)
 317 {
 318         pccard_io_map io = { 0, 0, 0, 0, 1 };
 319         struct pcmcia_socket *s = p_dev->socket;
 320         config_t *c;
 321         int i;
 322
 323         mutex_lock(&s->ops_mutex);
 324         c = p_dev->function_config;
 325         if (p_dev->_locked) {
 326                 p_dev->_locked = 0;
 327                 if (--(s->lock_count) == 0) {
 328                         s->socket.flags = SS_OUTPUT_ENA;   /* Is this correct? */
 329                         s->socket.Vpp = 0;
 330                         s->socket.io_irq = 0;
 331                         s->ops->set_socket(s, &s->socket);
 332                 }
 333         }
 334         if (c->state & CONFIG_LOCKED) {
 335                 c->state &= ~CONFIG_LOCKED;
 336                 if (c->state & CONFIG_IO_REQ)
 337                         for (i = 0; i < MAX_IO_WIN; i++) {
 338                                 if (!s->io[i].res)
 339                                         continue;
 340                                 s->io[i].Config--;
 341                                 if (s->io[i].Config != 0)
 342                                         continue;
 343                                 io.map = i;
 344                                 s->ops->set_io_map(s, &io);
 345                         }
 346         }
 347         mutex_unlock(&s->ops_mutex);
 348
 349         return 0;
 350 } /* pcmcia_release_configuration */
 351
 352
 353 /** pcmcia_release_io
 354  *
 355  * Release_io() releases the I/O ranges allocated by a client.  This
 356  * may be invoked some time after a card ejection has already dumped
 357  * the actual socket configuration, so if the client is "stale", we
 358  * don't bother checking the port ranges against the current socket
 359  * values.
 360  */
 361 static int pcmcia_release_io(struct pcmcia_device *p_dev)
 362 {
 363         struct pcmcia_socket *s = p_dev->socket;
 364         int ret = -EINVAL;
 365         config_t *c;
 366
 367         mutex_lock(&s->ops_mutex);
 368         if (!p_dev->_io)
 369                 goto out;
 370
 371         c = p_dev->function_config;
 372
 373         release_io_space(s, &c->io[0]);
 374
 375         if (c->io[1].end)
 376                 release_io_space(s, &c->io[1]);
 377
 378         p_dev->_io = 0;
 379         c->state &= ~CONFIG_IO_REQ;
 380
 381 out:
 382         mutex_unlock(&s->ops_mutex);
 383
 384         return ret;
 385 } /* pcmcia_release_io */
 386
 387
 388 int pcmcia_release_window(struct pcmcia_device *p_dev, struct resource *res)
 389 {
 390         struct pcmcia_socket *s = p_dev->socket;
 391         pccard_mem_map *win;
 392         unsigned int w;
 393
 394         dev_dbg(&p_dev->dev, "releasing window %pR\n", res);
 395
 396         w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1;
 397         if (w >= MAX_WIN)
 398                 return -EINVAL;
 399
 400         mutex_lock(&s->ops_mutex);
 401         win = &s->win[w];
 402
 403         if (!(p_dev->_win & CLIENT_WIN_REQ(w))) {
 404                 dev_dbg(&s->dev, "not releasing unknown window\n");
 405                 mutex_unlock(&s->ops_mutex);
 406                 return -EINVAL;
 407         }
 408
 409         /* Shut down memory window */
 410         win->flags &= ~MAP_ACTIVE;
 411         s->ops->set_mem_map(s, win);
 412         s->state &= ~SOCKET_WIN_REQ(w);
 413
 414         /* Release system memory */
 415         if (win->res) {
 416                 release_resource(res);
 417                 release_resource(win->res);
 418                 kfree(win->res);
 419                 win->res = NULL;
 420         }
 421         p_dev->_win &= ~CLIENT_WIN_REQ(w);
 422         mutex_unlock(&s->ops_mutex);
 423
 424         return 0;
 425 } /* pcmcia_release_window */
 426 EXPORT_SYMBOL(pcmcia_release_window);
 427
 428
 429 int pcmcia_request_configuration(struct pcmcia_device *p_dev,
 430                                  config_req_t *req)
 431 {
 432         int i;
 433         u_int base;
 434         struct pcmcia_socket *s = p_dev->socket;
 435         config_t *c;
 436         pccard_io_map iomap;
 437
 438         if (!(s->state & SOCKET_PRESENT))
 439                 return -ENODEV;
 440
 441         if (req->IntType & INT_CARDBUS) {
 442                 dev_dbg(&s->dev, "IntType may not be INT_CARDBUS\n");
 443                 return -EINVAL;
 444         }
 445
 446         mutex_lock(&s->ops_mutex);
 447         c = p_dev->function_config;
 448         if (c->state & CONFIG_LOCKED) {
 449                 mutex_unlock(&s->ops_mutex);
 450                 dev_dbg(&s->dev, "Configuration is locked\n");
 451                 return -EACCES;
 452         }
 453
 454         /* Do power control.  We don't allow changes in Vcc. */
 455         s->socket.Vpp = req->Vpp;
 456         if (s->ops->set_socket(s, &s->socket)) {
 457                 mutex_unlock(&s->ops_mutex);
 458                 dev_printk(KERN_WARNING, &s->dev,
 459                            "Unable to set socket state\n");
 460                 return -EINVAL;
 461         }
 462
 463         /* Pick memory or I/O card, DMA mode, interrupt */
 464         c->IntType = req->IntType;
 465         c->Attributes = req->Attributes;
 466         if (req->IntType & INT_MEMORY_AND_IO)
 467                 s->socket.flags |= SS_IOCARD;
 468         if (req->IntType & INT_ZOOMED_VIDEO)
 469                 s->socket.flags |= SS_ZVCARD | SS_IOCARD;
 470         if (req->Attributes & CONF_ENABLE_DMA)
 471                 s->socket.flags |= SS_DMA_MODE;
 472         if (req->Attributes & CONF_ENABLE_SPKR)
 473                 s->socket.flags |= SS_SPKR_ENA;
 474         if (req->Attributes & CONF_ENABLE_IRQ)
 475                 s->socket.io_irq = s->pcmcia_irq;
 476         else
 477                 s->socket.io_irq = 0;
 478         s->ops->set_socket(s, &s->socket);
 479         s->lock_count++;
 480
 481         /* Set up CIS configuration registers */
 482         base = c->ConfigBase = req->ConfigBase;
 483         c->CardValues = req->Present;
 484         if (req->Present & PRESENT_COPY) {
 485                 c->Copy = req->Copy;
 486                 pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &c->Copy);
 487         }
 488         if (req->Present & PRESENT_OPTION) {
 489                 if (s->functions == 1) {
 490                         c->Option = req->ConfigIndex & COR_CONFIG_MASK;
 491                 } else {
 492                         c->Option = req->ConfigIndex & COR_MFC_CONFIG_MASK;
 493                         c->Option |= COR_FUNC_ENA|COR_IREQ_ENA;
 494                         if (req->Present & PRESENT_IOBASE_0)
 495                                 c->Option |= COR_ADDR_DECODE;
 496                 }
 497                 if ((req->Attributes & CONF_ENABLE_IRQ) &&
 498                         !(req->Attributes & CONF_ENABLE_PULSE_IRQ))
 499                         c->Option |= COR_LEVEL_REQ;
 500                 pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &c->Option);
 501                 mdelay(40);
 502         }
 503         if (req->Present & PRESENT_STATUS) {
 504                 c->Status = req->Status;
 505                 pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &c->Status);
 506         }
 507         if (req->Present & PRESENT_PIN_REPLACE) {
 508                 c->Pin = req->Pin;
 509                 pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &c->Pin);
 510         }
 511         if (req->Present & PRESENT_EXT_STATUS) {
 512                 c->ExtStatus = req->ExtStatus;
 513                 pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1, &c->ExtStatus);
 514         }
 515         if (req->Present & PRESENT_IOBASE_0) {
 516                 u8 b = c->io[0].start & 0xff;
 517                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b);
 518                 b = (c->io[0].start >> 8) & 0xff;
 519                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b);
 520         }
 521         if (req->Present & PRESENT_IOSIZE) {
 522                 u8 b = resource_size(&c->io[0]) + resource_size(&c->io[1]) - 1;
 523                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b);
 524         }
 525
 526         /* Configure I/O windows */
 527         if (c->state & CONFIG_IO_REQ) {
 528                 iomap.speed = io_speed;
 529                 for (i = 0; i < MAX_IO_WIN; i++)
 530                         if (s->io[i].res) {
 531                                 iomap.map = i;
 532                                 iomap.flags = MAP_ACTIVE;
 533                                 switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) {
 534                                 case IO_DATA_PATH_WIDTH_16:
 535                                         iomap.flags |= MAP_16BIT; break;
 536                                 case IO_DATA_PATH_WIDTH_AUTO:
 537                                         iomap.flags |= MAP_AUTOSZ; break;
 538                                 default:
 539                                         break;
 540                                 }
 541                                 iomap.start = s->io[i].res->start;
 542                                 iomap.stop = s->io[i].res->end;
 543                                 s->ops->set_io_map(s, &iomap);
 544                                 s->io[i].Config++;
 545                         }
 546         }
 547
 548         c->state |= CONFIG_LOCKED;
 549         p_dev->_locked = 1;
 550         mutex_unlock(&s->ops_mutex);
 551         return 0;
 552 } /* pcmcia_request_configuration */
 553 EXPORT_SYMBOL(pcmcia_request_configuration);
 554
 555
 556 /**
 557  * pcmcia_request_io() - attempt to reserve port ranges for PCMCIA devices
 558  *
 559  * pcmcia_request_io() attepts to reserve the IO port ranges specified in
 560  * &struct pcmcia_device @p_dev->resource[0] and @p_dev->resource[1]. The
 561  * "start" value is the requested start of the IO port resource; "end"
 562  * reflects the number of ports requested. The number of IO lines requested
 563  * is specified in &struct pcmcia_device @p_dev->io_lines.
 564  */
 565 int pcmcia_request_io(struct pcmcia_device *p_dev)
 566 {
 567         struct pcmcia_socket *s = p_dev->socket;
 568         config_t *c = p_dev->function_config;
 569         int ret = -EINVAL;
 570
 571         mutex_lock(&s->ops_mutex);
 572         dev_dbg(&s->dev, "pcmcia_request_io: %pR , %pR", &c->io[0], &c->io[1]);
 573
 574         if (!(s->state & SOCKET_PRESENT)) {
 575                 dev_dbg(&s->dev, "pcmcia_request_io: No card present\n");
 576                 goto out;
 577         }
 578
 579         if (c->state & CONFIG_LOCKED) {
 580                 dev_dbg(&s->dev, "Configuration is locked\n");
 581                 goto out;
 582         }
 583         if (c->state & CONFIG_IO_REQ) {
 584                 dev_dbg(&s->dev, "IO already configured\n");
 585                 goto out;
 586         }
 587
 588         ret = alloc_io_space(s, &c->io[0], p_dev->io_lines);
 589         if (ret)
 590                 goto out;
 591
 592         if (c->io[1].end) {
 593                 ret = alloc_io_space(s, &c->io[1], p_dev->io_lines);
 594                 if (ret) {
 595                         release_io_space(s, &c->io[0]);
 596                         goto out;
 597                 }
 598         } else
 599                 c->io[1].start = 0;
 600
 601         c->state |= CONFIG_IO_REQ;
 602         p_dev->_io = 1;
 603
 604         dev_dbg(&s->dev, "pcmcia_request_io succeeded: %pR , %pR",
 605                 &c->io[0], &c->io[1]);
 606 out:
 607         mutex_unlock(&s->ops_mutex);
 608
 609         return ret;
 610 } /* pcmcia_request_io */
 611 EXPORT_SYMBOL(pcmcia_request_io);
 612
 613
 614 /**
 615  * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device
 616  *
 617  * pcmcia_request_irq() is a wrapper around request_irq which will allow
 618  * the PCMCIA core to clean up the registration in pcmcia_disable_device().
 619  * Drivers are free to use request_irq() directly, but then they need to
 620  * call free_irq themselfves, too. Also, only IRQF_SHARED capable IRQ
 621  * handlers are allowed.
 622  */
 623 int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev,
 624                                     irq_handler_t handler)
 625 {
 626         int ret;
 627
 628         if (!p_dev->irq)
 629                 return -EINVAL;
 630
 631         ret = request_irq(p_dev->irq, handler, IRQF_SHARED,
 632                         p_dev->devname, p_dev->priv);
 633         if (!ret)
 634                 p_dev->_irq = 1;
 635
 636         return ret;
 637 }
 638 EXPORT_SYMBOL(pcmcia_request_irq);
 639
 640
 641 /**
 642  * pcmcia_request_exclusive_irq() - attempt to request an exclusive IRQ first
 643  *
 644  * pcmcia_request_exclusive_irq() is a wrapper around request_irq which
 645  * attempts first to request an exclusive IRQ. If it fails, it also accepts
 646  * a shared IRQ, but prints out a warning. PCMCIA drivers should allow for
 647  * IRQ sharing and either use request_irq directly (then they need to call
 648  * free_irq themselves, too), or the pcmcia_request_irq() function.
 649  */
 650 int __must_check
 651 __pcmcia_request_exclusive_irq(struct pcmcia_device *p_dev,
 652                         irq_handler_t handler)
 653 {
 654         int ret;
 655
 656         if (!p_dev->irq)
 657                 return -EINVAL;
 658
 659         ret = request_irq(p_dev->irq, handler, 0, p_dev->devname, p_dev->priv);
 660         if (ret) {
 661                 ret = pcmcia_request_irq(p_dev, handler);
 662                 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: "
 663                         "request for exclusive IRQ could not be fulfilled.\n");
 664                 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver "
 665                         "needs updating to supported shared IRQ lines.\n");
 666         }
 667         if (ret)
 668                 dev_printk(KERN_INFO, &p_dev->dev, "request_irq() failed\n");
 669         else
 670                 p_dev->_irq = 1;
 671
 672         return ret;
 673 } /* pcmcia_request_exclusive_irq */
 674 EXPORT_SYMBOL(__pcmcia_request_exclusive_irq);
 675
 676
 677 #ifdef CONFIG_PCMCIA_PROBE
 678
 679 /* mask of IRQs already reserved by other cards, we should avoid using them */
 680 static u8 pcmcia_used_irq[32];
 681
 682 static irqreturn_t test_action(int cpl, void *dev_id)
 683 {
 684         return IRQ_NONE;
 685 }
 686
 687 /**
 688  * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used
 689  * @p_dev - the associated PCMCIA device
 690  *
 691  * locking note: must be called with ops_mutex locked.
 692  */
 693 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
 694 {
 695         struct pcmcia_socket *s = p_dev->socket;
 696         unsigned int try, irq;
 697         u32 mask = s->irq_mask;
 698         int ret = -ENODEV;
 699
 700         for (try = 0; try < 64; try++) {
 701                 irq = try % 32;
 702
 703                 if (irq > NR_IRQS)
 704                         continue;
 705
 706                 /* marked as available by driver, not blocked by userspace? */
 707                 if (!((mask >> irq) & 1))
 708                         continue;
 709
 710                 /* avoid an IRQ which is already used by another PCMCIA card */
 711                 if ((try < 32) && pcmcia_used_irq[irq])
 712                         continue;
 713
 714                 /* register the correct driver, if possible, to check whether
 715                  * registering a dummy handle works, i.e. if the IRQ isn't
 716                  * marked as used by the kernel resource management core */
 717                 ret = request_irq(irq, test_action, type, p_dev->devname,
 718                                   p_dev);
 719                 if (!ret) {
 720                         free_irq(irq, p_dev);
 721                         p_dev->irq = s->pcmcia_irq = irq;
 722                         pcmcia_used_irq[irq]++;
 723                         break;
 724                 }
 725         }
 726
 727         return ret;
 728 }
 729
 730 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
 731 {
 732         pcmcia_used_irq[s->pcmcia_irq]--;
 733         s->pcmcia_irq = 0;
 734 }
 735
 736 #else /* CONFIG_PCMCIA_PROBE */
 737
 738 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
 739 {
 740         return -EINVAL;
 741 }
 742
 743 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
 744 {
 745         s->pcmcia_irq = 0;
 746         return;
 747 }
 748
 749 #endif  /* CONFIG_PCMCIA_PROBE */
 750
 751
 752 /**
 753  * pcmcia_setup_irq() - determine IRQ to be used for device
 754  * @p_dev - the associated PCMCIA device
 755  *
 756  * locking note: must be called with ops_mutex locked.
 757  */
 758 int pcmcia_setup_irq(struct pcmcia_device *p_dev)
 759 {
 760         struct pcmcia_socket *s = p_dev->socket;
 761
 762         if (p_dev->irq)
 763                 return 0;
 764
 765         /* already assigned? */
 766         if (s->pcmcia_irq) {
 767                 p_dev->irq = s->pcmcia_irq;
 768                 return 0;
 769         }
 770
 771         /* prefer an exclusive ISA irq */
 772         if (!pcmcia_setup_isa_irq(p_dev, 0))
 773                 return 0;
 774
 775         /* but accept a shared ISA irq */
 776         if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED))
 777                 return 0;
 778
 779         /* but use the PCI irq otherwise */
 780         if (s->pci_irq) {
 781                 p_dev->irq = s->pcmcia_irq = s->pci_irq;
 782                 return 0;
 783         }
 784
 785         return -EINVAL;
 786 }
 787
 788
 789 /** pcmcia_request_window
 790  *
 791  * Request_window() establishes a mapping between card memory space
 792  * and system memory space.
 793  */
 794 int pcmcia_request_window(struct pcmcia_device *p_dev, win_req_t *req, window_handle_t *wh)
 795 {
 796         struct pcmcia_socket *s = p_dev->socket;
 797         pccard_mem_map *win;
 798         u_long align;
 799         struct resource *res;
 800         int w;
 801
 802         if (!(s->state & SOCKET_PRESENT)) {
 803                 dev_dbg(&s->dev, "No card present\n");
 804                 return -ENODEV;
 805         }
 806
 807         /* Window size defaults to smallest available */
 808         if (req->Size == 0)
 809                 req->Size = s->map_size;
 810         align = (s->features & SS_CAP_MEM_ALIGN) ? req->Size : s->map_size;
 811         if (req->Size & (s->map_size-1)) {
 812                 dev_dbg(&s->dev, "invalid map size\n");
 813                 return -EINVAL;
 814         }
 815         if ((req->Base && (s->features & SS_CAP_STATIC_MAP)) ||
 816             (req->Base & (align-1))) {
 817                 dev_dbg(&s->dev, "invalid base address\n");
 818                 return -EINVAL;
 819         }
 820         if (req->Base)
 821                 align = 0;
 822
 823         /* Allocate system memory window */
 824         mutex_lock(&s->ops_mutex);
 825         for (w = 0; w < MAX_WIN; w++)
 826                 if (!(s->state & SOCKET_WIN_REQ(w)))
 827                         break;
 828         if (w == MAX_WIN) {
 829                 dev_dbg(&s->dev, "all windows are used already\n");
 830                 mutex_unlock(&s->ops_mutex);
 831                 return -EINVAL;
 832         }
 833
 834         win = &s->win[w];
 835
 836         if (!(s->features & SS_CAP_STATIC_MAP)) {
 837                 win->res = pcmcia_find_mem_region(req->Base, req->Size, align,
 838                                                 0, s);
 839                 if (!win->res) {
 840                         dev_dbg(&s->dev, "allocating mem region failed\n");
 841                         mutex_unlock(&s->ops_mutex);
 842                         return -EINVAL;
 843                 }
 844         }
 845         p_dev->_win |= CLIENT_WIN_REQ(w);
 846
 847         /* Configure the socket controller */
 848         win->map = w+1;
 849         win->flags = req->Attributes;
 850         win->speed = req->AccessSpeed;
 851         win->card_start = 0;
 852
 853         if (s->ops->set_mem_map(s, win) != 0) {
 854                 dev_dbg(&s->dev, "failed to set memory mapping\n");
 855                 mutex_unlock(&s->ops_mutex);
 856                 return -EIO;
 857         }
 858         s->state |= SOCKET_WIN_REQ(w);
 859
 860         /* Return window handle */
 861         if (s->features & SS_CAP_STATIC_MAP)
 862                 req->Base = win->static_start;
 863         else
 864                 req->Base = win->res->start;
 865
 866         /* convert to new-style resources */
 867         res = p_dev->resource[w + MAX_IO_WIN];
 868         res->start = req->Base;
 869         res->end = req->Base + req->Size - 1;
 870         res->flags &= ~IORESOURCE_BITS;
 871         res->flags |= (req->Attributes & WIN_FLAGS_MAP) | (win->map << 2);
 872         res->flags |= IORESOURCE_MEM;
 873         res->parent = win->res;
 874         if (win->res)
 875                 request_resource(&iomem_resource, res);
 876
 877         dev_dbg(&s->dev, "request_window results in %pR\n", res);
 878
 879         mutex_unlock(&s->ops_mutex);
 880         *wh = res;
 881
 882         return 0;
 883 } /* pcmcia_request_window */
 884 EXPORT_SYMBOL(pcmcia_request_window);
 885
 886 void pcmcia_disable_device(struct pcmcia_device *p_dev)
 887 {
 888         int i;
 889         for (i = 0; i < MAX_WIN; i++) {
 890                 struct resource *res = p_dev->resource[MAX_IO_WIN + i];
 891                 if (res->flags & WIN_FLAGS_REQ)
 892                         pcmcia_release_window(p_dev, res);
 893         }
 894
 895         pcmcia_release_configuration(p_dev);
 896         pcmcia_release_io(p_dev);
 897         if (p_dev->_irq) {
 898                 free_irq(p_dev->irq, p_dev->priv);
 899                 p_dev->_irq = 0;
 900         }
 901 }
 902 EXPORT_SYMBOL(pcmcia_disable_device);