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(&p_dev->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, struct resource *res,
 208                         unsigned int offset)
 209 {
 210         struct pcmcia_socket *s = p_dev->socket;
 211         unsigned int w;
 212         int ret;
 213
 214         w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1;
 215         if (w >= MAX_WIN)
 216                 return -EINVAL;
 217
 218         mutex_lock(&s->ops_mutex);
 219         s->win[w].card_start = offset;
 220         ret = s->ops->set_mem_map(s, &s->win[w]);
 221         if (ret)
 222                 dev_warn(&p_dev->dev, "failed to set_mem_map\n");
 223         mutex_unlock(&s->ops_mutex);
 224         return ret;
 225 } /* pcmcia_map_mem_page */
 226 EXPORT_SYMBOL(pcmcia_map_mem_page);
 227
 228
 229 /**
 230  * pcmcia_fixup_iowidth() - reduce io width to 8bit
 231  *
 232  * pcmcia_fixup_iowidth() allows a PCMCIA device driver to reduce the
 233  * IO width to 8bit after having called pcmcia_request_configuration()
 234  * previously.
 235  */
 236 int pcmcia_fixup_iowidth(struct pcmcia_device *p_dev)
 237 {
 238         struct pcmcia_socket *s = p_dev->socket;
 239         pccard_io_map io_off = { 0, 0, 0, 0, 1 };
 240         pccard_io_map io_on;
 241         int i, ret = 0;
 242
 243         mutex_lock(&s->ops_mutex);
 244
 245         dev_dbg(&p_dev->dev, "fixup iowidth to 8bit\n");
 246
 247         if (!(s->state & SOCKET_PRESENT) ||
 248                 !(p_dev->function_config->state & CONFIG_LOCKED)) {
 249                 dev_dbg(&p_dev->dev, "No card? Config not locked?\n");
 250                 ret = -EACCES;
 251                 goto unlock;
 252         }
 253
 254         io_on.speed = io_speed;
 255         for (i = 0; i < MAX_IO_WIN; i++) {
 256                 if (!s->io[i].res)
 257                         continue;
 258                 io_off.map = i;
 259                 io_on.map = i;
 260
 261                 io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8;
 262                 io_on.start = s->io[i].res->start;
 263                 io_on.stop = s->io[i].res->end;
 264
 265                 s->ops->set_io_map(s, &io_off);
 266                 mdelay(40);
 267                 s->ops->set_io_map(s, &io_on);
 268         }
 269 unlock:
 270         mutex_unlock(&s->ops_mutex);
 271
 272         return ret;
 273 }
 274 EXPORT_SYMBOL(pcmcia_fixup_iowidth);
 275
 276
 277 /**
 278  * pcmcia_fixup_vpp() - set Vpp to a new voltage level
 279  *
 280  * pcmcia_fixup_vpp() allows a PCMCIA device driver to set Vpp to
 281  * a new voltage level between calls to pcmcia_request_configuration()
 282  * and pcmcia_disable_device().
 283  */
 284 int pcmcia_fixup_vpp(struct pcmcia_device *p_dev, unsigned char new_vpp)
 285 {
 286         struct pcmcia_socket *s = p_dev->socket;
 287         int ret = 0;
 288
 289         mutex_lock(&s->ops_mutex);
 290
 291         dev_dbg(&p_dev->dev, "fixup Vpp to %d\n", new_vpp);
 292
 293         if (!(s->state & SOCKET_PRESENT) ||
 294                 !(p_dev->function_config->state & CONFIG_LOCKED)) {
 295                 dev_dbg(&p_dev->dev, "No card? Config not locked?\n");
 296                 ret = -EACCES;
 297                 goto unlock;
 298         }
 299
 300         s->socket.Vpp = new_vpp;
 301         if (s->ops->set_socket(s, &s->socket)) {
 302                 dev_warn(&p_dev->dev, "Unable to set VPP\n");
 303                 ret = -EIO;
 304                 goto unlock;
 305         }
 306
 307 unlock:
 308         mutex_unlock(&s->ops_mutex);
 309
 310         return ret;
 311 }
 312 EXPORT_SYMBOL(pcmcia_fixup_vpp);
 313
 314
 315 int pcmcia_release_configuration(struct pcmcia_device *p_dev)
 316 {
 317         pccard_io_map io = { 0, 0, 0, 0, 1 };
 318         struct pcmcia_socket *s = p_dev->socket;
 319         config_t *c;
 320         int i;
 321
 322         mutex_lock(&s->ops_mutex);
 323         c = p_dev->function_config;
 324         if (p_dev->_locked) {
 325                 p_dev->_locked = 0;
 326                 if (--(s->lock_count) == 0) {
 327                         s->socket.flags = SS_OUTPUT_ENA;   /* Is this correct? */
 328                         s->socket.Vpp = 0;
 329                         s->socket.io_irq = 0;
 330                         s->ops->set_socket(s, &s->socket);
 331                 }
 332         }
 333         if (c->state & CONFIG_LOCKED) {
 334                 c->state &= ~CONFIG_LOCKED;
 335                 if (c->state & CONFIG_IO_REQ)
 336                         for (i = 0; i < MAX_IO_WIN; i++) {
 337                                 if (!s->io[i].res)
 338                                         continue;
 339                                 s->io[i].Config--;
 340                                 if (s->io[i].Config != 0)
 341                                         continue;
 342                                 io.map = i;
 343                                 s->ops->set_io_map(s, &io);
 344                         }
 345         }
 346         mutex_unlock(&s->ops_mutex);
 347
 348         return 0;
 349 } /* pcmcia_release_configuration */
 350
 351
 352 /** pcmcia_release_io
 353  *
 354  * Release_io() releases the I/O ranges allocated by a client.  This
 355  * may be invoked some time after a card ejection has already dumped
 356  * the actual socket configuration, so if the client is "stale", we
 357  * don't bother checking the port ranges against the current socket
 358  * values.
 359  */
 360 static int pcmcia_release_io(struct pcmcia_device *p_dev)
 361 {
 362         struct pcmcia_socket *s = p_dev->socket;
 363         int ret = -EINVAL;
 364         config_t *c;
 365
 366         mutex_lock(&s->ops_mutex);
 367         if (!p_dev->_io)
 368                 goto out;
 369
 370         c = p_dev->function_config;
 371
 372         release_io_space(s, &c->io[0]);
 373
 374         if (c->io[1].end)
 375                 release_io_space(s, &c->io[1]);
 376
 377         p_dev->_io = 0;
 378         c->state &= ~CONFIG_IO_REQ;
 379
 380 out:
 381         mutex_unlock(&s->ops_mutex);
 382
 383         return ret;
 384 } /* pcmcia_release_io */
 385
 386 /**
 387  * pcmcia_release_window() - release reserved iomem for PCMCIA devices
 388  *
 389  * pcmcia_release_window() releases struct resource *res which was
 390  * previously reserved by calling pcmcia_request_window().
 391  */
 392 int pcmcia_release_window(struct pcmcia_device *p_dev, struct resource *res)
 393 {
 394         struct pcmcia_socket *s = p_dev->socket;
 395         pccard_mem_map *win;
 396         unsigned int w;
 397
 398         dev_dbg(&p_dev->dev, "releasing window %pR\n", res);
 399
 400         w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1;
 401         if (w >= MAX_WIN)
 402                 return -EINVAL;
 403
 404         mutex_lock(&s->ops_mutex);
 405         win = &s->win[w];
 406
 407         if (!(p_dev->_win & CLIENT_WIN_REQ(w))) {
 408                 dev_dbg(&p_dev->dev, "not releasing unknown window\n");
 409                 mutex_unlock(&s->ops_mutex);
 410                 return -EINVAL;
 411         }
 412
 413         /* Shut down memory window */
 414         win->flags &= ~MAP_ACTIVE;
 415         s->ops->set_mem_map(s, win);
 416         s->state &= ~SOCKET_WIN_REQ(w);
 417
 418         /* Release system memory */
 419         if (win->res) {
 420                 release_resource(res);
 421                 release_resource(win->res);
 422                 kfree(win->res);
 423                 win->res = NULL;
 424         }
 425         res->start = res->end = 0;
 426         res->flags = IORESOURCE_MEM;
 427         p_dev->_win &= ~CLIENT_WIN_REQ(w);
 428         mutex_unlock(&s->ops_mutex);
 429
 430         return 0;
 431 } /* pcmcia_release_window */
 432 EXPORT_SYMBOL(pcmcia_release_window);
 433
 434
 435 int pcmcia_request_configuration(struct pcmcia_device *p_dev,
 436                                  config_req_t *req)
 437 {
 438         int i;
 439         u_int base;
 440         struct pcmcia_socket *s = p_dev->socket;
 441         config_t *c;
 442         pccard_io_map iomap;
 443
 444         if (!(s->state & SOCKET_PRESENT))
 445                 return -ENODEV;
 446
 447         if (req->IntType & INT_CARDBUS) {
 448                 dev_dbg(&p_dev->dev, "IntType may not be INT_CARDBUS\n");
 449                 return -EINVAL;
 450         }
 451
 452         mutex_lock(&s->ops_mutex);
 453         c = p_dev->function_config;
 454         if (c->state & CONFIG_LOCKED) {
 455                 mutex_unlock(&s->ops_mutex);
 456                 dev_dbg(&p_dev->dev, "Configuration is locked\n");
 457                 return -EACCES;
 458         }
 459
 460         /* Do power control.  We don't allow changes in Vcc. */
 461         s->socket.Vpp = req->Vpp;
 462         if (s->ops->set_socket(s, &s->socket)) {
 463                 mutex_unlock(&s->ops_mutex);
 464                 dev_printk(KERN_WARNING, &p_dev->dev,
 465                            "Unable to set socket state\n");
 466                 return -EINVAL;
 467         }
 468
 469         /* Pick memory or I/O card, DMA mode, interrupt */
 470         c->IntType = req->IntType;
 471         c->Attributes = req->Attributes;
 472         if (req->IntType & INT_MEMORY_AND_IO)
 473                 s->socket.flags |= SS_IOCARD;
 474         if (req->IntType & INT_ZOOMED_VIDEO)
 475                 s->socket.flags |= SS_ZVCARD | SS_IOCARD;
 476         if (req->Attributes & CONF_ENABLE_DMA)
 477                 s->socket.flags |= SS_DMA_MODE;
 478         if (req->Attributes & CONF_ENABLE_SPKR)
 479                 s->socket.flags |= SS_SPKR_ENA;
 480         if (req->Attributes & CONF_ENABLE_IRQ)
 481                 s->socket.io_irq = s->pcmcia_irq;
 482         else
 483                 s->socket.io_irq = 0;
 484         s->ops->set_socket(s, &s->socket);
 485         s->lock_count++;
 486
 487         /* Set up CIS configuration registers */
 488         base = c->ConfigBase = req->ConfigBase;
 489         c->CardValues = req->Present;
 490         if (req->Present & PRESENT_COPY) {
 491                 c->Copy = req->Copy;
 492                 pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &c->Copy);
 493         }
 494         if (req->Present & PRESENT_OPTION) {
 495                 if (s->functions == 1) {
 496                         c->Option = req->ConfigIndex & COR_CONFIG_MASK;
 497                 } else {
 498                         c->Option = req->ConfigIndex & COR_MFC_CONFIG_MASK;
 499                         c->Option |= COR_FUNC_ENA|COR_IREQ_ENA;
 500                         if (req->Present & PRESENT_IOBASE_0)
 501                                 c->Option |= COR_ADDR_DECODE;
 502                 }
 503                 if ((req->Attributes & CONF_ENABLE_IRQ) &&
 504                         !(req->Attributes & CONF_ENABLE_PULSE_IRQ))
 505                         c->Option |= COR_LEVEL_REQ;
 506                 pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &c->Option);
 507                 mdelay(40);
 508         }
 509         if (req->Present & PRESENT_STATUS) {
 510                 c->Status = req->Status;
 511                 pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &c->Status);
 512         }
 513         if (req->Present & PRESENT_PIN_REPLACE) {
 514                 c->Pin = req->Pin;
 515                 pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &c->Pin);
 516         }
 517         if (req->Present & PRESENT_EXT_STATUS) {
 518                 c->ExtStatus = req->ExtStatus;
 519                 pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1, &c->ExtStatus);
 520         }
 521         if (req->Present & PRESENT_IOBASE_0) {
 522                 u8 b = c->io[0].start & 0xff;
 523                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b);
 524                 b = (c->io[0].start >> 8) & 0xff;
 525                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b);
 526         }
 527         if (req->Present & PRESENT_IOSIZE) {
 528                 u8 b = resource_size(&c->io[0]) + resource_size(&c->io[1]) - 1;
 529                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b);
 530         }
 531
 532         /* Configure I/O windows */
 533         if (c->state & CONFIG_IO_REQ) {
 534                 iomap.speed = io_speed;
 535                 for (i = 0; i < MAX_IO_WIN; i++)
 536                         if (s->io[i].res) {
 537                                 iomap.map = i;
 538                                 iomap.flags = MAP_ACTIVE;
 539                                 switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) {
 540                                 case IO_DATA_PATH_WIDTH_16:
 541                                         iomap.flags |= MAP_16BIT; break;
 542                                 case IO_DATA_PATH_WIDTH_AUTO:
 543                                         iomap.flags |= MAP_AUTOSZ; break;
 544                                 default:
 545                                         break;
 546                                 }
 547                                 iomap.start = s->io[i].res->start;
 548                                 iomap.stop = s->io[i].res->end;
 549                                 s->ops->set_io_map(s, &iomap);
 550                                 s->io[i].Config++;
 551                         }
 552         }
 553
 554         c->state |= CONFIG_LOCKED;
 555         p_dev->_locked = 1;
 556         mutex_unlock(&s->ops_mutex);
 557         return 0;
 558 } /* pcmcia_request_configuration */
 559 EXPORT_SYMBOL(pcmcia_request_configuration);
 560
 561
 562 /**
 563  * pcmcia_request_io() - attempt to reserve port ranges for PCMCIA devices
 564  *
 565  * pcmcia_request_io() attepts to reserve the IO port ranges specified in
 566  * &struct pcmcia_device @p_dev->resource[0] and @p_dev->resource[1]. The
 567  * "start" value is the requested start of the IO port resource; "end"
 568  * reflects the number of ports requested. The number of IO lines requested
 569  * is specified in &struct pcmcia_device @p_dev->io_lines.
 570  */
 571 int pcmcia_request_io(struct pcmcia_device *p_dev)
 572 {
 573         struct pcmcia_socket *s = p_dev->socket;
 574         config_t *c = p_dev->function_config;
 575         int ret = -EINVAL;
 576
 577         mutex_lock(&s->ops_mutex);
 578         dev_dbg(&p_dev->dev, "pcmcia_request_io: %pR , %pR",
 579                 &c->io[0], &c->io[1]);
 580
 581         if (!(s->state & SOCKET_PRESENT)) {
 582                 dev_dbg(&p_dev->dev, "pcmcia_request_io: No card present\n");
 583                 goto out;
 584         }
 585
 586         if (c->state & CONFIG_LOCKED) {
 587                 dev_dbg(&p_dev->dev, "Configuration is locked\n");
 588                 goto out;
 589         }
 590         if (c->state & CONFIG_IO_REQ) {
 591                 dev_dbg(&p_dev->dev, "IO already configured\n");
 592                 goto out;
 593         }
 594
 595         ret = alloc_io_space(s, &c->io[0], p_dev->io_lines);
 596         if (ret)
 597                 goto out;
 598
 599         if (c->io[1].end) {
 600                 ret = alloc_io_space(s, &c->io[1], p_dev->io_lines);
 601                 if (ret) {
 602                         struct resource tmp = c->io[0];
 603                         /* release the previously allocated resource */
 604                         release_io_space(s, &c->io[0]);
 605                         /* but preserve the settings, for they worked... */
 606                         c->io[0].end = resource_size(&tmp);
 607                         c->io[0].start = tmp.start;
 608                         c->io[0].flags = tmp.flags;
 609                         goto out;
 610                 }
 611         } else
 612                 c->io[1].start = 0;
 613
 614         c->state |= CONFIG_IO_REQ;
 615         p_dev->_io = 1;
 616
 617         dev_dbg(&p_dev->dev, "pcmcia_request_io succeeded: %pR , %pR",
 618                 &c->io[0], &c->io[1]);
 619 out:
 620         mutex_unlock(&s->ops_mutex);
 621
 622         return ret;
 623 } /* pcmcia_request_io */
 624 EXPORT_SYMBOL(pcmcia_request_io);
 625
 626
 627 /**
 628  * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device
 629  *
 630  * pcmcia_request_irq() is a wrapper around request_irq which will allow
 631  * the PCMCIA core to clean up the registration in pcmcia_disable_device().
 632  * Drivers are free to use request_irq() directly, but then they need to
 633  * call free_irq themselfves, too. Also, only IRQF_SHARED capable IRQ
 634  * handlers are allowed.
 635  */
 636 int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev,
 637                                     irq_handler_t handler)
 638 {
 639         int ret;
 640
 641         if (!p_dev->irq)
 642                 return -EINVAL;
 643
 644         ret = request_irq(p_dev->irq, handler, IRQF_SHARED,
 645                         p_dev->devname, p_dev->priv);
 646         if (!ret)
 647                 p_dev->_irq = 1;
 648
 649         return ret;
 650 }
 651 EXPORT_SYMBOL(pcmcia_request_irq);
 652
 653
 654 /**
 655  * pcmcia_request_exclusive_irq() - attempt to request an exclusive IRQ first
 656  *
 657  * pcmcia_request_exclusive_irq() is a wrapper around request_irq which
 658  * attempts first to request an exclusive IRQ. If it fails, it also accepts
 659  * a shared IRQ, but prints out a warning. PCMCIA drivers should allow for
 660  * IRQ sharing and either use request_irq directly (then they need to call
 661  * free_irq themselves, too), or the pcmcia_request_irq() function.
 662  */
 663 int __must_check
 664 __pcmcia_request_exclusive_irq(struct pcmcia_device *p_dev,
 665                         irq_handler_t handler)
 666 {
 667         int ret;
 668
 669         if (!p_dev->irq)
 670                 return -EINVAL;
 671
 672         ret = request_irq(p_dev->irq, handler, 0, p_dev->devname, p_dev->priv);
 673         if (ret) {
 674                 ret = pcmcia_request_irq(p_dev, handler);
 675                 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: "
 676                         "request for exclusive IRQ could not be fulfilled.\n");
 677                 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver "
 678                         "needs updating to supported shared IRQ lines.\n");
 679         }
 680         if (ret)
 681                 dev_printk(KERN_INFO, &p_dev->dev, "request_irq() failed\n");
 682         else
 683                 p_dev->_irq = 1;
 684
 685         return ret;
 686 } /* pcmcia_request_exclusive_irq */
 687 EXPORT_SYMBOL(__pcmcia_request_exclusive_irq);
 688
 689
 690 #ifdef CONFIG_PCMCIA_PROBE
 691
 692 /* mask of IRQs already reserved by other cards, we should avoid using them */
 693 static u8 pcmcia_used_irq[32];
 694
 695 static irqreturn_t test_action(int cpl, void *dev_id)
 696 {
 697         return IRQ_NONE;
 698 }
 699
 700 /**
 701  * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used
 702  * @p_dev - the associated PCMCIA device
 703  *
 704  * locking note: must be called with ops_mutex locked.
 705  */
 706 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
 707 {
 708         struct pcmcia_socket *s = p_dev->socket;
 709         unsigned int try, irq;
 710         u32 mask = s->irq_mask;
 711         int ret = -ENODEV;
 712
 713         for (try = 0; try < 64; try++) {
 714                 irq = try % 32;
 715
 716                 if (irq > NR_IRQS)
 717                         continue;
 718
 719                 /* marked as available by driver, not blocked by userspace? */
 720                 if (!((mask >> irq) & 1))
 721                         continue;
 722
 723                 /* avoid an IRQ which is already used by another PCMCIA card */
 724                 if ((try < 32) && pcmcia_used_irq[irq])
 725                         continue;
 726
 727                 /* register the correct driver, if possible, to check whether
 728                  * registering a dummy handle works, i.e. if the IRQ isn't
 729                  * marked as used by the kernel resource management core */
 730                 ret = request_irq(irq, test_action, type, p_dev->devname,
 731                                   p_dev);
 732                 if (!ret) {
 733                         free_irq(irq, p_dev);
 734                         p_dev->irq = s->pcmcia_irq = irq;
 735                         pcmcia_used_irq[irq]++;
 736                         break;
 737                 }
 738         }
 739
 740         return ret;
 741 }
 742
 743 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
 744 {
 745         pcmcia_used_irq[s->pcmcia_irq]--;
 746         s->pcmcia_irq = 0;
 747 }
 748
 749 #else /* CONFIG_PCMCIA_PROBE */
 750
 751 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
 752 {
 753         return -EINVAL;
 754 }
 755
 756 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
 757 {
 758         s->pcmcia_irq = 0;
 759         return;
 760 }
 761
 762 #endif  /* CONFIG_PCMCIA_PROBE */
 763
 764
 765 /**
 766  * pcmcia_setup_irq() - determine IRQ to be used for device
 767  * @p_dev - the associated PCMCIA device
 768  *
 769  * locking note: must be called with ops_mutex locked.
 770  */
 771 int pcmcia_setup_irq(struct pcmcia_device *p_dev)
 772 {
 773         struct pcmcia_socket *s = p_dev->socket;
 774
 775         if (p_dev->irq)
 776                 return 0;
 777
 778         /* already assigned? */
 779         if (s->pcmcia_irq) {
 780                 p_dev->irq = s->pcmcia_irq;
 781                 return 0;
 782         }
 783
 784         /* prefer an exclusive ISA irq */
 785         if (!pcmcia_setup_isa_irq(p_dev, 0))
 786                 return 0;
 787
 788         /* but accept a shared ISA irq */
 789         if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED))
 790                 return 0;
 791
 792         /* but use the PCI irq otherwise */
 793         if (s->pci_irq) {
 794                 p_dev->irq = s->pcmcia_irq = s->pci_irq;
 795                 return 0;
 796         }
 797
 798         return -EINVAL;
 799 }
 800
 801
 802 /**
 803  * pcmcia_request_window() - attempt to reserve iomem for PCMCIA devices
 804  *
 805  * pcmcia_request_window() attepts to reserve an iomem ranges specified in
 806  * struct resource *res pointing to one of the entries in
 807  * struct pcmcia_device *p_dev->resource[2..5]. The "start" value is the
 808  * requested start of the IO mem resource; "end" reflects the size
 809  * requested.
 810  */
 811 int pcmcia_request_window(struct pcmcia_device *p_dev, struct resource *res,
 812                         unsigned int speed)
 813 {
 814         struct pcmcia_socket *s = p_dev->socket;
 815         pccard_mem_map *win;
 816         u_long align;
 817         int w;
 818
 819         if (!(s->state & SOCKET_PRESENT)) {
 820                 dev_dbg(&p_dev->dev, "No card present\n");
 821                 return -ENODEV;
 822         }
 823
 824         /* Window size defaults to smallest available */
 825         if (res->end == 0)
 826                 res->end = s->map_size;
 827         align = (s->features & SS_CAP_MEM_ALIGN) ? res->end : s->map_size;
 828         if (res->end & (s->map_size-1)) {
 829                 dev_dbg(&p_dev->dev, "invalid map size\n");
 830                 return -EINVAL;
 831         }
 832         if ((res->start && (s->features & SS_CAP_STATIC_MAP)) ||
 833             (res->start & (align-1))) {
 834                 dev_dbg(&p_dev->dev, "invalid base address\n");
 835                 return -EINVAL;
 836         }
 837         if (res->start)
 838                 align = 0;
 839
 840         /* Allocate system memory window */
 841         mutex_lock(&s->ops_mutex);
 842         for (w = 0; w < MAX_WIN; w++)
 843                 if (!(s->state & SOCKET_WIN_REQ(w)))
 844                         break;
 845         if (w == MAX_WIN) {
 846                 dev_dbg(&p_dev->dev, "all windows are used already\n");
 847                 mutex_unlock(&s->ops_mutex);
 848                 return -EINVAL;
 849         }
 850
 851         win = &s->win[w];
 852
 853         if (!(s->features & SS_CAP_STATIC_MAP)) {
 854                 win->res = pcmcia_find_mem_region(res->start, res->end, align,
 855                                                 0, s);
 856                 if (!win->res) {
 857                         dev_dbg(&p_dev->dev, "allocating mem region failed\n");
 858                         mutex_unlock(&s->ops_mutex);
 859                         return -EINVAL;
 860                 }
 861         }
 862         p_dev->_win |= CLIENT_WIN_REQ(w);
 863
 864         /* Configure the socket controller */
 865         win->map = w+1;
 866         win->flags = res->flags & WIN_FLAGS_MAP;
 867         win->speed = speed;
 868         win->card_start = 0;
 869
 870         if (s->ops->set_mem_map(s, win) != 0) {
 871                 dev_dbg(&p_dev->dev, "failed to set memory mapping\n");
 872                 mutex_unlock(&s->ops_mutex);
 873                 return -EIO;
 874         }
 875         s->state |= SOCKET_WIN_REQ(w);
 876
 877         /* Return window handle */
 878         if (s->features & SS_CAP_STATIC_MAP)
 879                 res->start = win->static_start;
 880         else
 881                 res->start = win->res->start;
 882
 883         /* convert to new-style resources */
 884         res->end += res->start - 1;
 885         res->flags &= ~WIN_FLAGS_REQ;
 886         res->flags |= (win->map << 2) | IORESOURCE_MEM;
 887         res->parent = win->res;
 888         if (win->res)
 889                 request_resource(&iomem_resource, res);
 890
 891         dev_dbg(&p_dev->dev, "request_window results in %pR\n", res);
 892
 893         mutex_unlock(&s->ops_mutex);
 894
 895         return 0;
 896 } /* pcmcia_request_window */
 897 EXPORT_SYMBOL(pcmcia_request_window);
 898
 899 void pcmcia_disable_device(struct pcmcia_device *p_dev)
 900 {
 901         int i;
 902         for (i = 0; i < MAX_WIN; i++) {
 903                 struct resource *res = p_dev->resource[MAX_IO_WIN + i];
 904                 if (res->flags & WIN_FLAGS_REQ)
 905                         pcmcia_release_window(p_dev, res);
 906         }
 907
 908         pcmcia_release_configuration(p_dev);
 909         pcmcia_release_io(p_dev);
 910         if (p_dev->_irq) {
 911                 free_irq(p_dev->irq, p_dev->priv);
 912                 p_dev->_irq = 0;
 913         }
 914 }
 915 EXPORT_SYMBOL(pcmcia_disable_device);