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 /** alloc_io_space
  60  *
  61  * Special stuff for managing IO windows, because they are scarce
  62  */
  63
  64 static int alloc_io_space(struct pcmcia_socket *s, u_int attr,
  65                           unsigned int *base, unsigned int num, u_int lines)
  66 {
  67         unsigned int align;
  68
  69         align = (*base) ? (lines ? 1<<lines : 0) : 1;
  70         if (align && (align < num)) {
  71                 if (*base) {
  72                         dev_dbg(&s->dev, "odd IO request: num %#x align %#x\n",
  73                                num, align);
  74                         align = 0;
  75                 } else
  76                         while (align && (align < num))
  77                                 align <<= 1;
  78         }
  79         if (*base & ~(align-1)) {
  80                 dev_dbg(&s->dev, "odd IO request: base %#x align %#x\n",
  81                        *base, align);
  82                 align = 0;
  83         }
  84
  85         return s->resource_ops->find_io(s, attr, base, num, align);
  86 } /* alloc_io_space */
  87
  88
  89 static void release_io_space(struct pcmcia_socket *s, unsigned int base,
  90                              unsigned int num)
  91 {
  92         int i;
  93
  94         for (i = 0; i < MAX_IO_WIN; i++) {
  95                 if (!s->io[i].res)
  96                         continue;
  97                 if ((s->io[i].res->start <= base) &&
  98                     (s->io[i].res->end >= base+num-1)) {
  99                         s->io[i].InUse -= num;
 100                         /* Free the window if no one else is using it */
 101                         if (s->io[i].InUse == 0) {
 102                                 release_resource(s->io[i].res);
 103                                 kfree(s->io[i].res);
 104                                 s->io[i].res = NULL;
 105                         }
 106                 }
 107         }
 108 } /* release_io_space */
 109
 110
 111 /**
 112  * pcmcia_access_config() - read or write card configuration registers
 113  *
 114  * pcmcia_access_config() reads and writes configuration registers in
 115  * attribute memory.  Memory window 0 is reserved for this and the tuple
 116  * reading services. Drivers must use pcmcia_read_config_byte() or
 117  * pcmcia_write_config_byte().
 118  */
 119 static int pcmcia_access_config(struct pcmcia_device *p_dev,
 120                                 off_t where, u8 *val,
 121                                 int (*accessf) (struct pcmcia_socket *s,
 122                                                 int attr, unsigned int addr,
 123                                                 unsigned int len, void *ptr))
 124 {
 125         struct pcmcia_socket *s;
 126         config_t *c;
 127         int addr;
 128         int ret = 0;
 129
 130         s = p_dev->socket;
 131
 132         mutex_lock(&s->ops_mutex);
 133         c = p_dev->function_config;
 134
 135         if (!(c->state & CONFIG_LOCKED)) {
 136                 dev_dbg(&s->dev, "Configuration isnt't locked\n");
 137                 mutex_unlock(&s->ops_mutex);
 138                 return -EACCES;
 139         }
 140
 141         addr = (c->ConfigBase + where) >> 1;
 142
 143         ret = accessf(s, 1, addr, 1, val);
 144
 145         mutex_unlock(&s->ops_mutex);
 146
 147         return ret;
 148 } /* pcmcia_access_config */
 149
 150
 151 /**
 152  * pcmcia_read_config_byte() - read a byte from a card configuration register
 153  *
 154  * pcmcia_read_config_byte() reads a byte from a configuration register in
 155  * attribute memory.
 156  */
 157 int pcmcia_read_config_byte(struct pcmcia_device *p_dev, off_t where, u8 *val)
 158 {
 159         return pcmcia_access_config(p_dev, where, val, pcmcia_read_cis_mem);
 160 }
 161 EXPORT_SYMBOL(pcmcia_read_config_byte);
 162
 163
 164 /**
 165  * pcmcia_write_config_byte() - write a byte to a card configuration register
 166  *
 167  * pcmcia_write_config_byte() writes a byte to a configuration register in
 168  * attribute memory.
 169  */
 170 int pcmcia_write_config_byte(struct pcmcia_device *p_dev, off_t where, u8 val)
 171 {
 172         return pcmcia_access_config(p_dev, where, &val, pcmcia_write_cis_mem);
 173 }
 174 EXPORT_SYMBOL(pcmcia_write_config_byte);
 175
 176
 177 int pcmcia_map_mem_page(struct pcmcia_device *p_dev, window_handle_t wh,
 178                         memreq_t *req)
 179 {
 180         struct pcmcia_socket *s = p_dev->socket;
 181         int ret;
 182
 183         wh--;
 184         if (wh >= MAX_WIN)
 185                 return -EINVAL;
 186         if (req->Page != 0) {
 187                 dev_dbg(&s->dev, "failure: requested page is zero\n");
 188                 return -EINVAL;
 189         }
 190         mutex_lock(&s->ops_mutex);
 191         s->win[wh].card_start = req->CardOffset;
 192         ret = s->ops->set_mem_map(s, &s->win[wh]);
 193         if (ret)
 194                 dev_warn(&s->dev, "failed to set_mem_map\n");
 195         mutex_unlock(&s->ops_mutex);
 196         return ret;
 197 } /* pcmcia_map_mem_page */
 198 EXPORT_SYMBOL(pcmcia_map_mem_page);
 199
 200
 201 /** pcmcia_modify_configuration
 202  *
 203  * Modify a locked socket configuration
 204  */
 205 int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
 206                                 modconf_t *mod)
 207 {
 208         struct pcmcia_socket *s;
 209         config_t *c;
 210         int ret;
 211
 212         s = p_dev->socket;
 213
 214         mutex_lock(&s->ops_mutex);
 215         c = p_dev->function_config;
 216
 217         if (!(s->state & SOCKET_PRESENT)) {
 218                 dev_dbg(&s->dev, "No card present\n");
 219                 ret = -ENODEV;
 220                 goto unlock;
 221         }
 222         if (!(c->state & CONFIG_LOCKED)) {
 223                 dev_dbg(&s->dev, "Configuration isnt't locked\n");
 224                 ret = -EACCES;
 225                 goto unlock;
 226         }
 227
 228         if (mod->Attributes & (CONF_IRQ_CHANGE_VALID | CONF_VCC_CHANGE_VALID)) {
 229                 dev_dbg(&s->dev,
 230                         "changing Vcc or IRQ is not allowed at this time\n");
 231                 ret = -EINVAL;
 232                 goto unlock;
 233         }
 234
 235         /* We only allow changing Vpp1 and Vpp2 to the same value */
 236         if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) &&
 237             (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
 238                 if (mod->Vpp1 != mod->Vpp2) {
 239                         dev_dbg(&s->dev, "Vpp1 and Vpp2 must be the same\n");
 240                         ret = -EINVAL;
 241                         goto unlock;
 242                 }
 243                 s->socket.Vpp = mod->Vpp1;
 244                 if (s->ops->set_socket(s, &s->socket)) {
 245                         dev_printk(KERN_WARNING, &s->dev,
 246                                    "Unable to set VPP\n");
 247                         ret = -EIO;
 248                         goto unlock;
 249                 }
 250         } else if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) ||
 251                    (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
 252                 dev_dbg(&s->dev, "changing Vcc is not allowed at this time\n");
 253                 ret = -EINVAL;
 254                 goto unlock;
 255         }
 256
 257         if (mod->Attributes & CONF_IO_CHANGE_WIDTH) {
 258                 pccard_io_map io_off = { 0, 0, 0, 0, 1 };
 259                 pccard_io_map io_on;
 260                 int i;
 261
 262                 io_on.speed = io_speed;
 263                 for (i = 0; i < MAX_IO_WIN; i++) {
 264                         if (!s->io[i].res)
 265                                 continue;
 266                         io_off.map = i;
 267                         io_on.map = i;
 268
 269                         io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8;
 270                         io_on.start = s->io[i].res->start;
 271                         io_on.stop = s->io[i].res->end;
 272
 273                         s->ops->set_io_map(s, &io_off);
 274                         mdelay(40);
 275                         s->ops->set_io_map(s, &io_on);
 276                 }
 277         }
 278         ret = 0;
 279 unlock:
 280         mutex_unlock(&s->ops_mutex);
 281
 282         return ret;
 283 } /* modify_configuration */
 284 EXPORT_SYMBOL(pcmcia_modify_configuration);
 285
 286
 287 int pcmcia_release_configuration(struct pcmcia_device *p_dev)
 288 {
 289         pccard_io_map io = { 0, 0, 0, 0, 1 };
 290         struct pcmcia_socket *s = p_dev->socket;
 291         config_t *c;
 292         int i;
 293
 294         mutex_lock(&s->ops_mutex);
 295         c = p_dev->function_config;
 296         if (p_dev->_locked) {
 297                 p_dev->_locked = 0;
 298                 if (--(s->lock_count) == 0) {
 299                         s->socket.flags = SS_OUTPUT_ENA;   /* Is this correct? */
 300                         s->socket.Vpp = 0;
 301                         s->socket.io_irq = 0;
 302                         s->ops->set_socket(s, &s->socket);
 303                 }
 304         }
 305         if (c->state & CONFIG_LOCKED) {
 306                 c->state &= ~CONFIG_LOCKED;
 307                 if (c->state & CONFIG_IO_REQ)
 308                         for (i = 0; i < MAX_IO_WIN; i++) {
 309                                 if (!s->io[i].res)
 310                                         continue;
 311                                 s->io[i].Config--;
 312                                 if (s->io[i].Config != 0)
 313                                         continue;
 314                                 io.map = i;
 315                                 s->ops->set_io_map(s, &io);
 316                         }
 317         }
 318         mutex_unlock(&s->ops_mutex);
 319
 320         return 0;
 321 } /* pcmcia_release_configuration */
 322
 323
 324 /** pcmcia_release_io
 325  *
 326  * Release_io() releases the I/O ranges allocated by a client.  This
 327  * may be invoked some time after a card ejection has already dumped
 328  * the actual socket configuration, so if the client is "stale", we
 329  * don't bother checking the port ranges against the current socket
 330  * values.
 331  */
 332 static int pcmcia_release_io(struct pcmcia_device *p_dev, io_req_t *req)
 333 {
 334         struct pcmcia_socket *s = p_dev->socket;
 335         int ret = -EINVAL;
 336         config_t *c;
 337
 338         mutex_lock(&s->ops_mutex);
 339         c = p_dev->function_config;
 340
 341         if (!p_dev->_io)
 342                 goto out;
 343
 344         p_dev->_io = 0;
 345
 346         if ((c->io.BasePort1 != req->BasePort1) ||
 347             (c->io.NumPorts1 != req->NumPorts1) ||
 348             (c->io.BasePort2 != req->BasePort2) ||
 349             (c->io.NumPorts2 != req->NumPorts2))
 350                 goto out;
 351
 352         c->state &= ~CONFIG_IO_REQ;
 353
 354         release_io_space(s, req->BasePort1, req->NumPorts1);
 355         if (req->NumPorts2)
 356                 release_io_space(s, req->BasePort2, req->NumPorts2);
 357
 358 out:
 359         mutex_unlock(&s->ops_mutex);
 360
 361         return ret;
 362 } /* pcmcia_release_io */
 363
 364
 365 int pcmcia_release_window(struct pcmcia_device *p_dev, window_handle_t wh)
 366 {
 367         struct pcmcia_socket *s = p_dev->socket;
 368         pccard_mem_map *win;
 369
 370         wh--;
 371         if (wh >= MAX_WIN)
 372                 return -EINVAL;
 373
 374         mutex_lock(&s->ops_mutex);
 375         win = &s->win[wh];
 376
 377         if (!(p_dev->_win & CLIENT_WIN_REQ(wh))) {
 378                 dev_dbg(&s->dev, "not releasing unknown window\n");
 379                 mutex_unlock(&s->ops_mutex);
 380                 return -EINVAL;
 381         }
 382
 383         /* Shut down memory window */
 384         win->flags &= ~MAP_ACTIVE;
 385         s->ops->set_mem_map(s, win);
 386         s->state &= ~SOCKET_WIN_REQ(wh);
 387
 388         /* Release system memory */
 389         if (win->res) {
 390                 release_resource(win->res);
 391                 kfree(win->res);
 392                 win->res = NULL;
 393         }
 394         p_dev->_win &= ~CLIENT_WIN_REQ(wh);
 395         mutex_unlock(&s->ops_mutex);
 396
 397         return 0;
 398 } /* pcmcia_release_window */
 399 EXPORT_SYMBOL(pcmcia_release_window);
 400
 401
 402 int pcmcia_request_configuration(struct pcmcia_device *p_dev,
 403                                  config_req_t *req)
 404 {
 405         int i;
 406         u_int base;
 407         struct pcmcia_socket *s = p_dev->socket;
 408         config_t *c;
 409         pccard_io_map iomap;
 410
 411         if (!(s->state & SOCKET_PRESENT))
 412                 return -ENODEV;
 413
 414         if (req->IntType & INT_CARDBUS) {
 415                 dev_dbg(&s->dev, "IntType may not be INT_CARDBUS\n");
 416                 return -EINVAL;
 417         }
 418
 419         mutex_lock(&s->ops_mutex);
 420         c = p_dev->function_config;
 421         if (c->state & CONFIG_LOCKED) {
 422                 mutex_unlock(&s->ops_mutex);
 423                 dev_dbg(&s->dev, "Configuration is locked\n");
 424                 return -EACCES;
 425         }
 426
 427         /* Do power control.  We don't allow changes in Vcc. */
 428         s->socket.Vpp = req->Vpp;
 429         if (s->ops->set_socket(s, &s->socket)) {
 430                 mutex_unlock(&s->ops_mutex);
 431                 dev_printk(KERN_WARNING, &s->dev,
 432                            "Unable to set socket state\n");
 433                 return -EINVAL;
 434         }
 435
 436         /* Pick memory or I/O card, DMA mode, interrupt */
 437         c->IntType = req->IntType;
 438         c->Attributes = req->Attributes;
 439         if (req->IntType & INT_MEMORY_AND_IO)
 440                 s->socket.flags |= SS_IOCARD;
 441         if (req->IntType & INT_ZOOMED_VIDEO)
 442                 s->socket.flags |= SS_ZVCARD | SS_IOCARD;
 443         if (req->Attributes & CONF_ENABLE_DMA)
 444                 s->socket.flags |= SS_DMA_MODE;
 445         if (req->Attributes & CONF_ENABLE_SPKR)
 446                 s->socket.flags |= SS_SPKR_ENA;
 447         if (req->Attributes & CONF_ENABLE_IRQ)
 448                 s->socket.io_irq = s->pcmcia_irq;
 449         else
 450                 s->socket.io_irq = 0;
 451         s->ops->set_socket(s, &s->socket);
 452         s->lock_count++;
 453
 454         /* Set up CIS configuration registers */
 455         base = c->ConfigBase = req->ConfigBase;
 456         c->CardValues = req->Present;
 457         if (req->Present & PRESENT_COPY) {
 458                 c->Copy = req->Copy;
 459                 pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &c->Copy);
 460         }
 461         if (req->Present & PRESENT_OPTION) {
 462                 if (s->functions == 1) {
 463                         c->Option = req->ConfigIndex & COR_CONFIG_MASK;
 464                 } else {
 465                         c->Option = req->ConfigIndex & COR_MFC_CONFIG_MASK;
 466                         c->Option |= COR_FUNC_ENA|COR_IREQ_ENA;
 467                         if (req->Present & PRESENT_IOBASE_0)
 468                                 c->Option |= COR_ADDR_DECODE;
 469                 }
 470                 if ((req->Attributes & CONF_ENABLE_IRQ) &&
 471                         !(req->Attributes & CONF_ENABLE_PULSE_IRQ))
 472                         c->Option |= COR_LEVEL_REQ;
 473                 pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &c->Option);
 474                 mdelay(40);
 475         }
 476         if (req->Present & PRESENT_STATUS) {
 477                 c->Status = req->Status;
 478                 pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &c->Status);
 479         }
 480         if (req->Present & PRESENT_PIN_REPLACE) {
 481                 c->Pin = req->Pin;
 482                 pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &c->Pin);
 483         }
 484         if (req->Present & PRESENT_EXT_STATUS) {
 485                 c->ExtStatus = req->ExtStatus;
 486                 pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1, &c->ExtStatus);
 487         }
 488         if (req->Present & PRESENT_IOBASE_0) {
 489                 u_char b = c->io.BasePort1 & 0xff;
 490                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b);
 491                 b = (c->io.BasePort1 >> 8) & 0xff;
 492                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b);
 493         }
 494         if (req->Present & PRESENT_IOSIZE) {
 495                 u_char b = c->io.NumPorts1 + c->io.NumPorts2 - 1;
 496                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b);
 497         }
 498
 499         /* Configure I/O windows */
 500         if (c->state & CONFIG_IO_REQ) {
 501                 iomap.speed = io_speed;
 502                 for (i = 0; i < MAX_IO_WIN; i++)
 503                         if (s->io[i].res) {
 504                                 iomap.map = i;
 505                                 iomap.flags = MAP_ACTIVE;
 506                                 switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) {
 507                                 case IO_DATA_PATH_WIDTH_16:
 508                                         iomap.flags |= MAP_16BIT; break;
 509                                 case IO_DATA_PATH_WIDTH_AUTO:
 510                                         iomap.flags |= MAP_AUTOSZ; break;
 511                                 default:
 512                                         break;
 513                                 }
 514                                 iomap.start = s->io[i].res->start;
 515                                 iomap.stop = s->io[i].res->end;
 516                                 s->ops->set_io_map(s, &iomap);
 517                                 s->io[i].Config++;
 518                         }
 519         }
 520
 521         c->state |= CONFIG_LOCKED;
 522         p_dev->_locked = 1;
 523         mutex_unlock(&s->ops_mutex);
 524         return 0;
 525 } /* pcmcia_request_configuration */
 526 EXPORT_SYMBOL(pcmcia_request_configuration);
 527
 528
 529 /** pcmcia_request_io
 530  *
 531  * Request_io() reserves ranges of port addresses for a socket.
 532  * I have not implemented range sharing or alias addressing.
 533  */
 534 int pcmcia_request_io(struct pcmcia_device *p_dev, io_req_t *req)
 535 {
 536         struct pcmcia_socket *s = p_dev->socket;
 537         config_t *c;
 538         int ret = -EINVAL;
 539
 540         mutex_lock(&s->ops_mutex);
 541
 542         if (!(s->state & SOCKET_PRESENT)) {
 543                 dev_dbg(&s->dev, "No card present\n");
 544                 goto out;
 545         }
 546
 547         if (!req)
 548                 goto out;
 549
 550         c = p_dev->function_config;
 551         if (c->state & CONFIG_LOCKED) {
 552                 dev_dbg(&s->dev, "Configuration is locked\n");
 553                 goto out;
 554         }
 555         if (c->state & CONFIG_IO_REQ) {
 556                 dev_dbg(&s->dev, "IO already configured\n");
 557                 goto out;
 558         }
 559         if (req->Attributes1 & (IO_SHARED | IO_FORCE_ALIAS_ACCESS)) {
 560                 dev_dbg(&s->dev, "bad attribute setting for IO region 1\n");
 561                 goto out;
 562         }
 563         if ((req->NumPorts2 > 0) &&
 564             (req->Attributes2 & (IO_SHARED | IO_FORCE_ALIAS_ACCESS))) {
 565                 dev_dbg(&s->dev, "bad attribute setting for IO region 2\n");
 566                 goto out;
 567         }
 568
 569         dev_dbg(&s->dev, "trying to allocate resource 1\n");
 570         ret = alloc_io_space(s, req->Attributes1, &req->BasePort1,
 571                              req->NumPorts1, req->IOAddrLines);
 572         if (ret) {
 573                 dev_dbg(&s->dev, "allocation of resource 1 failed\n");
 574                 goto out;
 575         }
 576
 577         if (req->NumPorts2) {
 578                 dev_dbg(&s->dev, "trying to allocate resource 2\n");
 579                 ret = alloc_io_space(s, req->Attributes2, &req->BasePort2,
 580                                      req->NumPorts2, req->IOAddrLines);
 581                 if (ret) {
 582                         dev_dbg(&s->dev, "allocation of resource 2 failed\n");
 583                         release_io_space(s, req->BasePort1, req->NumPorts1);
 584                         goto out;
 585                 }
 586         }
 587
 588         c->io = *req;
 589         c->state |= CONFIG_IO_REQ;
 590         p_dev->_io = 1;
 591         dev_dbg(&s->dev, "allocating resources succeeded: %d\n", ret);
 592
 593 out:
 594         mutex_unlock(&s->ops_mutex);
 595
 596         return ret;
 597 } /* pcmcia_request_io */
 598 EXPORT_SYMBOL(pcmcia_request_io);
 599
 600
 601 /**
 602  * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device
 603  *
 604  * pcmcia_request_irq() is a wrapper around request_irq which will allow
 605  * the PCMCIA core to clean up the registration in pcmcia_disable_device().
 606  * Drivers are free to use request_irq() directly, but then they need to
 607  * call free_irq themselfves, too. Also, only IRQF_SHARED capable IRQ
 608  * handlers are allowed.
 609  */
 610 int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev,
 611                                     irq_handler_t handler)
 612 {
 613         int ret;
 614
 615         if (!p_dev->irq)
 616                 return -EINVAL;
 617
 618         ret = request_irq(p_dev->irq, handler, IRQF_SHARED,
 619                         p_dev->devname, p_dev->priv);
 620         if (!ret)
 621                 p_dev->_irq = 1;
 622
 623         return ret;
 624 }
 625 EXPORT_SYMBOL(pcmcia_request_irq);
 626
 627
 628 /**
 629  * pcmcia_request_exclusive_irq() - attempt to request an exclusive IRQ first
 630  *
 631  * pcmcia_request_exclusive_irq() is a wrapper around request_irq which
 632  * attempts first to request an exclusive IRQ. If it fails, it also accepts
 633  * a shared IRQ, but prints out a warning. PCMCIA drivers should allow for
 634  * IRQ sharing and either use request_irq directly (then they need to call
 635  * free_irq themselves, too), or the pcmcia_request_irq() function.
 636  */
 637 int __must_check
 638 __pcmcia_request_exclusive_irq(struct pcmcia_device *p_dev,
 639                         irq_handler_t handler)
 640 {
 641         int ret;
 642
 643         if (!p_dev->irq)
 644                 return -EINVAL;
 645
 646         ret = request_irq(p_dev->irq, handler, 0, p_dev->devname, p_dev->priv);
 647         if (ret) {
 648                 ret = pcmcia_request_irq(p_dev, handler);
 649                 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: "
 650                         "request for exclusive IRQ could not be fulfilled.\n");
 651                 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver "
 652                         "needs updating to supported shared IRQ lines.\n");
 653         }
 654         if (ret)
 655                 dev_printk(KERN_INFO, &p_dev->dev, "request_irq() failed\n");
 656         else
 657                 p_dev->_irq = 1;
 658
 659         return ret;
 660 } /* pcmcia_request_exclusive_irq */
 661 EXPORT_SYMBOL(__pcmcia_request_exclusive_irq);
 662
 663
 664 #ifdef CONFIG_PCMCIA_PROBE
 665
 666 /* mask of IRQs already reserved by other cards, we should avoid using them */
 667 static u8 pcmcia_used_irq[NR_IRQS];
 668
 669 static irqreturn_t test_action(int cpl, void *dev_id)
 670 {
 671         return IRQ_NONE;
 672 }
 673
 674 /**
 675  * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used
 676  * @p_dev - the associated PCMCIA device
 677  *
 678  * locking note: must be called with ops_mutex locked.
 679  */
 680 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
 681 {
 682         struct pcmcia_socket *s = p_dev->socket;
 683         unsigned int try, irq;
 684         u32 mask = s->irq_mask;
 685         int ret = -ENODEV;
 686
 687         for (try = 0; try < 64; try++) {
 688                 irq = try % 32;
 689
 690                 /* marked as available by driver, not blocked by userspace? */
 691                 if (!((mask >> irq) & 1))
 692                         continue;
 693
 694                 /* avoid an IRQ which is already used by another PCMCIA card */
 695                 if ((try < 32) && pcmcia_used_irq[irq])
 696                         continue;
 697
 698                 /* register the correct driver, if possible, to check whether
 699                  * registering a dummy handle works, i.e. if the IRQ isn't
 700                  * marked as used by the kernel resource management core */
 701                 ret = request_irq(irq, test_action, type, p_dev->devname,
 702                                   p_dev);
 703                 if (!ret) {
 704                         free_irq(irq, p_dev);
 705                         p_dev->irq = s->pcmcia_irq = irq;
 706                         pcmcia_used_irq[irq]++;
 707                         break;
 708                 }
 709         }
 710
 711         return ret;
 712 }
 713
 714 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
 715 {
 716         pcmcia_used_irq[s->pcmcia_irq]--;
 717         s->pcmcia_irq = 0;
 718 }
 719
 720 #else /* CONFIG_PCMCIA_PROBE */
 721
 722 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
 723 {
 724         return -EINVAL;
 725 }
 726
 727 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
 728 {
 729         s->pcmcia_irq = 0;
 730         return;
 731 }
 732
 733 #endif  /* CONFIG_PCMCIA_PROBE */
 734
 735
 736 /**
 737  * pcmcia_setup_irq() - determine IRQ to be used for device
 738  * @p_dev - the associated PCMCIA device
 739  *
 740  * locking note: must be called with ops_mutex locked.
 741  */
 742 int pcmcia_setup_irq(struct pcmcia_device *p_dev)
 743 {
 744         struct pcmcia_socket *s = p_dev->socket;
 745
 746         if (p_dev->irq)
 747                 return 0;
 748
 749         /* already assigned? */
 750         if (s->pcmcia_irq) {
 751                 p_dev->irq = s->pcmcia_irq;
 752                 return 0;
 753         }
 754
 755         /* prefer an exclusive ISA irq */
 756         if (!pcmcia_setup_isa_irq(p_dev, 0))
 757                 return 0;
 758
 759         /* but accept a shared ISA irq */
 760         if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED))
 761                 return 0;
 762
 763         /* but use the PCI irq otherwise */
 764         if (s->pci_irq) {
 765                 p_dev->irq = s->pcmcia_irq = s->pci_irq;
 766                 return 0;
 767         }
 768
 769         return -EINVAL;
 770 }
 771
 772
 773 /** pcmcia_request_window
 774  *
 775  * Request_window() establishes a mapping between card memory space
 776  * and system memory space.
 777  */
 778 int pcmcia_request_window(struct pcmcia_device *p_dev, win_req_t *req, window_handle_t *wh)
 779 {
 780         struct pcmcia_socket *s = p_dev->socket;
 781         pccard_mem_map *win;
 782         u_long align;
 783         int w;
 784
 785         if (!(s->state & SOCKET_PRESENT)) {
 786                 dev_dbg(&s->dev, "No card present\n");
 787                 return -ENODEV;
 788         }
 789         if (req->Attributes & (WIN_PAGED | WIN_SHARED)) {
 790                 dev_dbg(&s->dev, "bad attribute setting for iomem region\n");
 791                 return -EINVAL;
 792         }
 793
 794         /* Window size defaults to smallest available */
 795         if (req->Size == 0)
 796                 req->Size = s->map_size;
 797         align = (((s->features & SS_CAP_MEM_ALIGN) ||
 798                   (req->Attributes & WIN_STRICT_ALIGN)) ?
 799                  req->Size : s->map_size);
 800         if (req->Size & (s->map_size-1)) {
 801                 dev_dbg(&s->dev, "invalid map size\n");
 802                 return -EINVAL;
 803         }
 804         if ((req->Base && (s->features & SS_CAP_STATIC_MAP)) ||
 805             (req->Base & (align-1))) {
 806                 dev_dbg(&s->dev, "invalid base address\n");
 807                 return -EINVAL;
 808         }
 809         if (req->Base)
 810                 align = 0;
 811
 812         /* Allocate system memory window */
 813         for (w = 0; w < MAX_WIN; w++)
 814                 if (!(s->state & SOCKET_WIN_REQ(w)))
 815                         break;
 816         if (w == MAX_WIN) {
 817                 dev_dbg(&s->dev, "all windows are used already\n");
 818                 return -EINVAL;
 819         }
 820
 821         mutex_lock(&s->ops_mutex);
 822         win = &s->win[w];
 823
 824         if (!(s->features & SS_CAP_STATIC_MAP)) {
 825                 win->res = pcmcia_find_mem_region(req->Base, req->Size, align,
 826                                                       (req->Attributes & WIN_MAP_BELOW_1MB), s);
 827                 if (!win->res) {
 828                         dev_dbg(&s->dev, "allocating mem region failed\n");
 829                         mutex_unlock(&s->ops_mutex);
 830                         return -EINVAL;
 831                 }
 832         }
 833         p_dev->_win |= CLIENT_WIN_REQ(w);
 834
 835         /* Configure the socket controller */
 836         win->map = w+1;
 837         win->flags = 0;
 838         win->speed = req->AccessSpeed;
 839         if (req->Attributes & WIN_MEMORY_TYPE)
 840                 win->flags |= MAP_ATTRIB;
 841         if (req->Attributes & WIN_ENABLE)
 842                 win->flags |= MAP_ACTIVE;
 843         if (req->Attributes & WIN_DATA_WIDTH_16)
 844                 win->flags |= MAP_16BIT;
 845         if (req->Attributes & WIN_USE_WAIT)
 846                 win->flags |= MAP_USE_WAIT;
 847         win->card_start = 0;
 848
 849         if (s->ops->set_mem_map(s, win) != 0) {
 850                 dev_dbg(&s->dev, "failed to set memory mapping\n");
 851                 mutex_unlock(&s->ops_mutex);
 852                 return -EIO;
 853         }
 854         s->state |= SOCKET_WIN_REQ(w);
 855
 856         /* Return window handle */
 857         if (s->features & SS_CAP_STATIC_MAP)
 858                 req->Base = win->static_start;
 859         else
 860                 req->Base = win->res->start;
 861
 862         mutex_unlock(&s->ops_mutex);
 863         *wh = w + 1;
 864
 865         return 0;
 866 } /* pcmcia_request_window */
 867 EXPORT_SYMBOL(pcmcia_request_window);
 868
 869 void pcmcia_disable_device(struct pcmcia_device *p_dev)
 870 {
 871         pcmcia_release_configuration(p_dev);
 872         pcmcia_release_io(p_dev, &p_dev->io);
 873         if (p_dev->_irq) {
 874                 free_irq(p_dev->irq, p_dev->priv);
 875                 p_dev->_irq = 0;
 876         }
 877         if (p_dev->win)
 878                 pcmcia_release_window(p_dev, p_dev->win);
 879 }
 880 EXPORT_SYMBOL(pcmcia_disable_device);