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/cistpl.h>
  30 #include <pcmcia/cisreg.h>
  31 #include <pcmcia/ds.h>
  32
  33 #include "cs_internal.h"
  34
  35
  36 /* Access speed for IO windows */
  37 static int io_speed;
  38 module_param(io_speed, int, 0444);
  39
  40
  41 int pcmcia_validate_mem(struct pcmcia_socket *s)
  42 {
  43         if (s->resource_ops->validate_mem)
  44                 return s->resource_ops->validate_mem(s);
  45         /* if there is no callback, we can assume that everything is OK */
  46         return 0;
  47 }
  48
  49 struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
  50                                  int low, struct pcmcia_socket *s)
  51 {
  52         if (s->resource_ops->find_mem)
  53                 return s->resource_ops->find_mem(base, num, align, low, s);
  54         return NULL;
  55 }
  56
  57
  58 static void release_io_space(struct pcmcia_socket *s, struct resource *res)
  59 {
  60         resource_size_t num = resource_size(res);
  61         int i;
  62
  63         dev_dbg(&s->dev, "release_io_space for %pR\n", res);
  64
  65         for (i = 0; i < MAX_IO_WIN; i++) {
  66                 if (!s->io[i].res)
  67                         continue;
  68                 if ((s->io[i].res->start <= res->start) &&
  69                     (s->io[i].res->end >= res->end)) {
  70                         s->io[i].InUse -= num;
  71                         if (res->parent)
  72                                 release_resource(res);
  73                         res->start = res->end = 0;
  74                         res->flags = IORESOURCE_IO;
  75                         /* Free the window if no one else is using it */
  76                         if (s->io[i].InUse == 0) {
  77                                 release_resource(s->io[i].res);
  78                                 kfree(s->io[i].res);
  79                                 s->io[i].res = NULL;
  80                         }
  81                 }
  82         }
  83 } /* release_io_space */
  84
  85 /** alloc_io_space
  86  *
  87  * Special stuff for managing IO windows, because they are scarce
  88  */
  89 static int alloc_io_space(struct pcmcia_socket *s, struct resource *res,
  90                         unsigned int lines)
  91 {
  92         unsigned int align;
  93         unsigned int base = res->start;
  94         unsigned int num = res->end;
  95         int ret;
  96
  97         res->flags |= IORESOURCE_IO;
  98
  99         dev_dbg(&s->dev, "alloc_io_space request for %pR, %d lines\n",
 100                 res, lines);
 101
 102         align = base ? (lines ? 1<<lines : 0) : 1;
 103         if (align && (align < num)) {
 104                 if (base) {
 105                         dev_dbg(&s->dev, "odd IO request\n");
 106                         align = 0;
 107                 } else
 108                         while (align && (align < num))
 109                                 align <<= 1;
 110         }
 111         if (base & ~(align-1)) {
 112                 dev_dbg(&s->dev, "odd IO request\n");
 113                 align = 0;
 114         }
 115
 116         ret = s->resource_ops->find_io(s, res->flags, &base, num, align,
 117                                 &res->parent);
 118         if (ret) {
 119                 dev_dbg(&s->dev, "alloc_io_space request failed (%d)\n", ret);
 120                 return -EINVAL;
 121         }
 122
 123         res->start = base;
 124         res->end = res->start + num - 1;
 125
 126         if (res->parent) {
 127                 ret = request_resource(res->parent, res);
 128                 if (ret) {
 129                         dev_warn(&s->dev,
 130                                 "request_resource %pR failed: %d\n", res, ret);
 131                         res->parent = NULL;
 132                         release_io_space(s, res);
 133                 }
 134         }
 135         dev_dbg(&s->dev, "alloc_io_space request result %d: %pR\n", ret, res);
 136         return ret;
 137 } /* alloc_io_space */
 138
 139
 140 /**
 141  * pcmcia_access_config() - read or write card configuration registers
 142  *
 143  * pcmcia_access_config() reads and writes configuration registers in
 144  * attribute memory.  Memory window 0 is reserved for this and the tuple
 145  * reading services. Drivers must use pcmcia_read_config_byte() or
 146  * pcmcia_write_config_byte().
 147  */
 148 static int pcmcia_access_config(struct pcmcia_device *p_dev,
 149                                 off_t where, u8 *val,
 150                                 int (*accessf) (struct pcmcia_socket *s,
 151                                                 int attr, unsigned int addr,
 152                                                 unsigned int len, void *ptr))
 153 {
 154         struct pcmcia_socket *s;
 155         config_t *c;
 156         int addr;
 157         int ret = 0;
 158
 159         s = p_dev->socket;
 160
 161         mutex_lock(&s->ops_mutex);
 162         c = p_dev->function_config;
 163
 164         if (!(c->state & CONFIG_LOCKED)) {
 165                 dev_dbg(&p_dev->dev, "Configuration isnt't locked\n");
 166                 mutex_unlock(&s->ops_mutex);
 167                 return -EACCES;
 168         }
 169
 170         addr = (p_dev->config_base + where) >> 1;
 171
 172         ret = accessf(s, 1, addr, 1, val);
 173
 174         mutex_unlock(&s->ops_mutex);
 175
 176         return ret;
 177 } /* pcmcia_access_config */
 178
 179
 180 /**
 181  * pcmcia_read_config_byte() - read a byte from a card configuration register
 182  *
 183  * pcmcia_read_config_byte() reads a byte from a configuration register in
 184  * attribute memory.
 185  */
 186 int pcmcia_read_config_byte(struct pcmcia_device *p_dev, off_t where, u8 *val)
 187 {
 188         return pcmcia_access_config(p_dev, where, val, pcmcia_read_cis_mem);
 189 }
 190 EXPORT_SYMBOL(pcmcia_read_config_byte);
 191
 192
 193 /**
 194  * pcmcia_write_config_byte() - write a byte to a card configuration register
 195  *
 196  * pcmcia_write_config_byte() writes a byte to a configuration register in
 197  * attribute memory.
 198  */
 199 int pcmcia_write_config_byte(struct pcmcia_device *p_dev, off_t where, u8 val)
 200 {
 201         return pcmcia_access_config(p_dev, where, &val, pcmcia_write_cis_mem);
 202 }
 203 EXPORT_SYMBOL(pcmcia_write_config_byte);
 204
 205
 206 int pcmcia_map_mem_page(struct pcmcia_device *p_dev, struct resource *res,
 207                         unsigned int offset)
 208 {
 209         struct pcmcia_socket *s = p_dev->socket;
 210         unsigned int w;
 211         int ret;
 212
 213         w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1;
 214         if (w >= MAX_WIN)
 215                 return -EINVAL;
 216
 217         mutex_lock(&s->ops_mutex);
 218         s->win[w].card_start = offset;
 219         ret = s->ops->set_mem_map(s, &s->win[w]);
 220         if (ret)
 221                 dev_warn(&p_dev->dev, "failed to set_mem_map\n");
 222         mutex_unlock(&s->ops_mutex);
 223         return ret;
 224 } /* pcmcia_map_mem_page */
 225 EXPORT_SYMBOL(pcmcia_map_mem_page);
 226
 227
 228 /**
 229  * pcmcia_fixup_iowidth() - reduce io width to 8bit
 230  *
 231  * pcmcia_fixup_iowidth() allows a PCMCIA device driver to reduce the
 232  * IO width to 8bit after having called pcmcia_enable_device()
 233  * previously.
 234  */
 235 int pcmcia_fixup_iowidth(struct pcmcia_device *p_dev)
 236 {
 237         struct pcmcia_socket *s = p_dev->socket;
 238         pccard_io_map io_off = { 0, 0, 0, 0, 1 };
 239         pccard_io_map io_on;
 240         int i, ret = 0;
 241
 242         mutex_lock(&s->ops_mutex);
 243
 244         dev_dbg(&p_dev->dev, "fixup iowidth to 8bit\n");
 245
 246         if (!(s->state & SOCKET_PRESENT) ||
 247                 !(p_dev->function_config->state & CONFIG_LOCKED)) {
 248                 dev_dbg(&p_dev->dev, "No card? Config not locked?\n");
 249                 ret = -EACCES;
 250                 goto unlock;
 251         }
 252
 253         io_on.speed = io_speed;
 254         for (i = 0; i < MAX_IO_WIN; i++) {
 255                 if (!s->io[i].res)
 256                         continue;
 257                 io_off.map = i;
 258                 io_on.map = i;
 259
 260                 io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8;
 261                 io_on.start = s->io[i].res->start;
 262                 io_on.stop = s->io[i].res->end;
 263
 264                 s->ops->set_io_map(s, &io_off);
 265                 mdelay(40);
 266                 s->ops->set_io_map(s, &io_on);
 267         }
 268 unlock:
 269         mutex_unlock(&s->ops_mutex);
 270
 271         return ret;
 272 }
 273 EXPORT_SYMBOL(pcmcia_fixup_iowidth);
 274
 275
 276 /**
 277  * pcmcia_fixup_vpp() - set Vpp to a new voltage level
 278  *
 279  * pcmcia_fixup_vpp() allows a PCMCIA device driver to set Vpp to
 280  * a new voltage level between calls to pcmcia_enable_device()
 281  * and pcmcia_disable_device().
 282  */
 283 int pcmcia_fixup_vpp(struct pcmcia_device *p_dev, unsigned char new_vpp)
 284 {
 285         struct pcmcia_socket *s = p_dev->socket;
 286         int ret = 0;
 287
 288         mutex_lock(&s->ops_mutex);
 289
 290         dev_dbg(&p_dev->dev, "fixup Vpp to %d\n", new_vpp);
 291
 292         if (!(s->state & SOCKET_PRESENT) ||
 293                 !(p_dev->function_config->state & CONFIG_LOCKED)) {
 294                 dev_dbg(&p_dev->dev, "No card? Config not locked?\n");
 295                 ret = -EACCES;
 296                 goto unlock;
 297         }
 298
 299         s->socket.Vpp = new_vpp;
 300         if (s->ops->set_socket(s, &s->socket)) {
 301                 dev_warn(&p_dev->dev, "Unable to set VPP\n");
 302                 ret = -EIO;
 303                 goto unlock;
 304         }
 305         p_dev->vpp = new_vpp;
 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  * pcmcia_enable_device() - set up and activate a PCMCIA device
 436  *
 437  */
 438 int pcmcia_enable_device(struct pcmcia_device *p_dev)
 439 {
 440         int i;
 441         unsigned int base;
 442         struct pcmcia_socket *s = p_dev->socket;
 443         config_t *c;
 444         pccard_io_map iomap;
 445         unsigned char status = 0;
 446         unsigned char ext_status = 0;
 447         unsigned char option = 0;
 448         unsigned int flags = p_dev->config_flags;
 449
 450         if (!(s->state & SOCKET_PRESENT))
 451                 return -ENODEV;
 452
 453         mutex_lock(&s->ops_mutex);
 454         c = p_dev->function_config;
 455         if (c->state & CONFIG_LOCKED) {
 456                 mutex_unlock(&s->ops_mutex);
 457                 dev_dbg(&p_dev->dev, "Configuration is locked\n");
 458                 return -EACCES;
 459         }
 460
 461         /* Do power control.  We don't allow changes in Vcc. */
 462         s->socket.Vpp = p_dev->vpp;
 463         if (s->ops->set_socket(s, &s->socket)) {
 464                 mutex_unlock(&s->ops_mutex);
 465                 dev_printk(KERN_WARNING, &p_dev->dev,
 466                            "Unable to set socket state\n");
 467                 return -EINVAL;
 468         }
 469
 470         /* Pick memory or I/O card, DMA mode, interrupt */
 471         if (p_dev->_io)
 472                 s->socket.flags |= SS_IOCARD;
 473         if (flags & CONF_ENABLE_SPKR) {
 474                 s->socket.flags |= SS_SPKR_ENA;
 475                 status = CCSR_AUDIO_ENA;
 476                 if (!(p_dev->config_regs & PRESENT_STATUS))
 477                         dev_warn(&p_dev->dev, "speaker requested, but "
 478                                               "PRESENT_STATUS not set!\n");
 479         }
 480         if (flags & CONF_ENABLE_IRQ)
 481                 s->socket.io_irq = s->pcmcia_irq;
 482         else
 483                 s->socket.io_irq = 0;
 484         if (flags & CONF_ENABLE_ESR) {
 485                 p_dev->config_regs |= PRESENT_EXT_STATUS;
 486                 ext_status = ESR_REQ_ATTN_ENA;
 487         }
 488         s->ops->set_socket(s, &s->socket);
 489         s->lock_count++;
 490
 491         /* Set up CIS configuration registers */
 492         base = p_dev->config_base;
 493         if (p_dev->config_regs & PRESENT_COPY) {
 494                 u16 tmp = 0;
 495                 dev_dbg(&p_dev->dev, "clearing CISREG_SCR\n");
 496                 pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &tmp);
 497         }
 498         if (p_dev->config_regs & PRESENT_PIN_REPLACE) {
 499                 u16 tmp = 0;
 500                 dev_dbg(&p_dev->dev, "clearing CISREG_PRR\n");
 501                 pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &tmp);
 502         }
 503         if (p_dev->config_regs & PRESENT_OPTION) {
 504                 if (s->functions == 1) {
 505                         option = p_dev->config_index & COR_CONFIG_MASK;
 506                 } else {
 507                         option = p_dev->config_index & COR_MFC_CONFIG_MASK;
 508                         option |= COR_FUNC_ENA|COR_IREQ_ENA;
 509                         if (p_dev->config_regs & PRESENT_IOBASE_0)
 510                                 option |= COR_ADDR_DECODE;
 511                 }
 512                 if ((flags & CONF_ENABLE_IRQ) &&
 513                         !(flags & CONF_ENABLE_PULSE_IRQ))
 514                         option |= COR_LEVEL_REQ;
 515                 pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &option);
 516                 mdelay(40);
 517         }
 518         if (p_dev->config_regs & PRESENT_STATUS)
 519                 pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &status);
 520
 521         if (p_dev->config_regs & PRESENT_EXT_STATUS)
 522                 pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1,
 523                                         &ext_status);
 524
 525         if (p_dev->config_regs & PRESENT_IOBASE_0) {
 526                 u8 b = c->io[0].start & 0xff;
 527                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b);
 528                 b = (c->io[0].start >> 8) & 0xff;
 529                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b);
 530         }
 531         if (p_dev->config_regs & PRESENT_IOSIZE) {
 532                 u8 b = resource_size(&c->io[0]) + resource_size(&c->io[1]) - 1;
 533                 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b);
 534         }
 535
 536         /* Configure I/O windows */
 537         if (c->state & CONFIG_IO_REQ) {
 538                 iomap.speed = io_speed;
 539                 for (i = 0; i < MAX_IO_WIN; i++)
 540                         if (s->io[i].res) {
 541                                 iomap.map = i;
 542                                 iomap.flags = MAP_ACTIVE;
 543                                 switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) {
 544                                 case IO_DATA_PATH_WIDTH_16:
 545                                         iomap.flags |= MAP_16BIT; break;
 546                                 case IO_DATA_PATH_WIDTH_AUTO:
 547                                         iomap.flags |= MAP_AUTOSZ; break;
 548                                 default:
 549                                         break;
 550                                 }
 551                                 iomap.start = s->io[i].res->start;
 552                                 iomap.stop = s->io[i].res->end;
 553                                 s->ops->set_io_map(s, &iomap);
 554                                 s->io[i].Config++;
 555                         }
 556         }
 557
 558         c->state |= CONFIG_LOCKED;
 559         p_dev->_locked = 1;
 560         mutex_unlock(&s->ops_mutex);
 561         return 0;
 562 } /* pcmcia_enable_device */
 563 EXPORT_SYMBOL(pcmcia_enable_device);
 564
 565
 566 /**
 567  * pcmcia_request_io() - attempt to reserve port ranges for PCMCIA devices
 568  *
 569  * pcmcia_request_io() attepts to reserve the IO port ranges specified in
 570  * &struct pcmcia_device @p_dev->resource[0] and @p_dev->resource[1]. The
 571  * "start" value is the requested start of the IO port resource; "end"
 572  * reflects the number of ports requested. The number of IO lines requested
 573  * is specified in &struct pcmcia_device @p_dev->io_lines.
 574  */
 575 int pcmcia_request_io(struct pcmcia_device *p_dev)
 576 {
 577         struct pcmcia_socket *s = p_dev->socket;
 578         config_t *c = p_dev->function_config;
 579         int ret = -EINVAL;
 580
 581         mutex_lock(&s->ops_mutex);
 582         dev_dbg(&p_dev->dev, "pcmcia_request_io: %pR , %pR",
 583                 &c->io[0], &c->io[1]);
 584
 585         if (!(s->state & SOCKET_PRESENT)) {
 586                 dev_dbg(&p_dev->dev, "pcmcia_request_io: No card present\n");
 587                 goto out;
 588         }
 589
 590         if (c->state & CONFIG_LOCKED) {
 591                 dev_dbg(&p_dev->dev, "Configuration is locked\n");
 592                 goto out;
 593         }
 594         if (c->state & CONFIG_IO_REQ) {
 595                 dev_dbg(&p_dev->dev, "IO already configured\n");
 596                 goto out;
 597         }
 598
 599         ret = alloc_io_space(s, &c->io[0], p_dev->io_lines);
 600         if (ret)
 601                 goto out;
 602
 603         if (c->io[1].end) {
 604                 ret = alloc_io_space(s, &c->io[1], p_dev->io_lines);
 605                 if (ret) {
 606                         struct resource tmp = c->io[0];
 607                         /* release the previously allocated resource */
 608                         release_io_space(s, &c->io[0]);
 609                         /* but preserve the settings, for they worked... */
 610                         c->io[0].end = resource_size(&tmp);
 611                         c->io[0].start = tmp.start;
 612                         c->io[0].flags = tmp.flags;
 613                         goto out;
 614                 }
 615         } else
 616                 c->io[1].start = 0;
 617
 618         c->state |= CONFIG_IO_REQ;
 619         p_dev->_io = 1;
 620
 621         dev_dbg(&p_dev->dev, "pcmcia_request_io succeeded: %pR , %pR",
 622                 &c->io[0], &c->io[1]);
 623 out:
 624         mutex_unlock(&s->ops_mutex);
 625
 626         return ret;
 627 } /* pcmcia_request_io */
 628 EXPORT_SYMBOL(pcmcia_request_io);
 629
 630
 631 /**
 632  * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device
 633  *
 634  * pcmcia_request_irq() is a wrapper around request_irq which will allow
 635  * the PCMCIA core to clean up the registration in pcmcia_disable_device().
 636  * Drivers are free to use request_irq() directly, but then they need to
 637  * call free_irq themselfves, too. Also, only IRQF_SHARED capable IRQ
 638  * handlers are allowed.
 639  */
 640 int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev,
 641                                     irq_handler_t handler)
 642 {
 643         int ret;
 644
 645         if (!p_dev->irq)
 646                 return -EINVAL;
 647
 648         ret = request_irq(p_dev->irq, handler, IRQF_SHARED,
 649                         p_dev->devname, p_dev->priv);
 650         if (!ret)
 651                 p_dev->_irq = 1;
 652
 653         return ret;
 654 }
 655 EXPORT_SYMBOL(pcmcia_request_irq);
 656
 657
 658 /**
 659  * pcmcia_request_exclusive_irq() - attempt to request an exclusive IRQ first
 660  *
 661  * pcmcia_request_exclusive_irq() is a wrapper around request_irq which
 662  * attempts first to request an exclusive IRQ. If it fails, it also accepts
 663  * a shared IRQ, but prints out a warning. PCMCIA drivers should allow for
 664  * IRQ sharing and either use request_irq directly (then they need to call
 665  * free_irq themselves, too), or the pcmcia_request_irq() function.
 666  */
 667 int __must_check
 668 __pcmcia_request_exclusive_irq(struct pcmcia_device *p_dev,
 669                         irq_handler_t handler)
 670 {
 671         int ret;
 672
 673         if (!p_dev->irq)
 674                 return -EINVAL;
 675
 676         ret = request_irq(p_dev->irq, handler, 0, p_dev->devname, p_dev->priv);
 677         if (ret) {
 678                 ret = pcmcia_request_irq(p_dev, handler);
 679                 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: "
 680                         "request for exclusive IRQ could not be fulfilled.\n");
 681                 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver "
 682                         "needs updating to supported shared IRQ lines.\n");
 683         }
 684         if (ret)
 685                 dev_printk(KERN_INFO, &p_dev->dev, "request_irq() failed\n");
 686         else
 687                 p_dev->_irq = 1;
 688
 689         return ret;
 690 } /* pcmcia_request_exclusive_irq */
 691 EXPORT_SYMBOL(__pcmcia_request_exclusive_irq);
 692
 693
 694 #ifdef CONFIG_PCMCIA_PROBE
 695
 696 /* mask of IRQs already reserved by other cards, we should avoid using them */
 697 static u8 pcmcia_used_irq[32];
 698
 699 static irqreturn_t test_action(int cpl, void *dev_id)
 700 {
 701         return IRQ_NONE;
 702 }
 703
 704 /**
 705  * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used
 706  * @p_dev - the associated PCMCIA device
 707  *
 708  * locking note: must be called with ops_mutex locked.
 709  */
 710 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
 711 {
 712         struct pcmcia_socket *s = p_dev->socket;
 713         unsigned int try, irq;
 714         u32 mask = s->irq_mask;
 715         int ret = -ENODEV;
 716
 717         for (try = 0; try < 64; try++) {
 718                 irq = try % 32;
 719
 720                 if (irq > NR_IRQS)
 721                         continue;
 722
 723                 /* marked as available by driver, not blocked by userspace? */
 724                 if (!((mask >> irq) & 1))
 725                         continue;
 726
 727                 /* avoid an IRQ which is already used by another PCMCIA card */
 728                 if ((try < 32) && pcmcia_used_irq[irq])
 729                         continue;
 730
 731                 /* register the correct driver, if possible, to check whether
 732                  * registering a dummy handle works, i.e. if the IRQ isn't
 733                  * marked as used by the kernel resource management core */
 734                 ret = request_irq(irq, test_action, type, p_dev->devname,
 735                                   p_dev);
 736                 if (!ret) {
 737                         free_irq(irq, p_dev);
 738                         p_dev->irq = s->pcmcia_irq = irq;
 739                         pcmcia_used_irq[irq]++;
 740                         break;
 741                 }
 742         }
 743
 744         return ret;
 745 }
 746
 747 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
 748 {
 749         pcmcia_used_irq[s->pcmcia_irq]--;
 750         s->pcmcia_irq = 0;
 751 }
 752
 753 #else /* CONFIG_PCMCIA_PROBE */
 754
 755 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
 756 {
 757         return -EINVAL;
 758 }
 759
 760 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
 761 {
 762         s->pcmcia_irq = 0;
 763         return;
 764 }
 765
 766 #endif  /* CONFIG_PCMCIA_PROBE */
 767
 768
 769 /**
 770  * pcmcia_setup_irq() - determine IRQ to be used for device
 771  * @p_dev - the associated PCMCIA device
 772  *
 773  * locking note: must be called with ops_mutex locked.
 774  */
 775 int pcmcia_setup_irq(struct pcmcia_device *p_dev)
 776 {
 777         struct pcmcia_socket *s = p_dev->socket;
 778
 779         if (p_dev->irq)
 780                 return 0;
 781
 782         /* already assigned? */
 783         if (s->pcmcia_irq) {
 784                 p_dev->irq = s->pcmcia_irq;
 785                 return 0;
 786         }
 787
 788         /* prefer an exclusive ISA irq */
 789         if (!pcmcia_setup_isa_irq(p_dev, 0))
 790                 return 0;
 791
 792         /* but accept a shared ISA irq */
 793         if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED))
 794                 return 0;
 795
 796         /* but use the PCI irq otherwise */
 797         if (s->pci_irq) {
 798                 p_dev->irq = s->pcmcia_irq = s->pci_irq;
 799                 return 0;
 800         }
 801
 802         return -EINVAL;
 803 }
 804
 805
 806 /**
 807  * pcmcia_request_window() - attempt to reserve iomem for PCMCIA devices
 808  *
 809  * pcmcia_request_window() attepts to reserve an iomem ranges specified in
 810  * struct resource *res pointing to one of the entries in
 811  * struct pcmcia_device *p_dev->resource[2..5]. The "start" value is the
 812  * requested start of the IO mem resource; "end" reflects the size
 813  * requested.
 814  */
 815 int pcmcia_request_window(struct pcmcia_device *p_dev, struct resource *res,
 816                         unsigned int speed)
 817 {
 818         struct pcmcia_socket *s = p_dev->socket;
 819         pccard_mem_map *win;
 820         u_long align;
 821         int w;
 822
 823         if (!(s->state & SOCKET_PRESENT)) {
 824                 dev_dbg(&p_dev->dev, "No card present\n");
 825                 return -ENODEV;
 826         }
 827
 828         /* Window size defaults to smallest available */
 829         if (res->end == 0)
 830                 res->end = s->map_size;
 831         align = (s->features & SS_CAP_MEM_ALIGN) ? res->end : s->map_size;
 832         if (res->end & (s->map_size-1)) {
 833                 dev_dbg(&p_dev->dev, "invalid map size\n");
 834                 return -EINVAL;
 835         }
 836         if ((res->start && (s->features & SS_CAP_STATIC_MAP)) ||
 837             (res->start & (align-1))) {
 838                 dev_dbg(&p_dev->dev, "invalid base address\n");
 839                 return -EINVAL;
 840         }
 841         if (res->start)
 842                 align = 0;
 843
 844         /* Allocate system memory window */
 845         mutex_lock(&s->ops_mutex);
 846         for (w = 0; w < MAX_WIN; w++)
 847                 if (!(s->state & SOCKET_WIN_REQ(w)))
 848                         break;
 849         if (w == MAX_WIN) {
 850                 dev_dbg(&p_dev->dev, "all windows are used already\n");
 851                 mutex_unlock(&s->ops_mutex);
 852                 return -EINVAL;
 853         }
 854
 855         win = &s->win[w];
 856
 857         if (!(s->features & SS_CAP_STATIC_MAP)) {
 858                 win->res = pcmcia_find_mem_region(res->start, res->end, align,
 859                                                 0, s);
 860                 if (!win->res) {
 861                         dev_dbg(&p_dev->dev, "allocating mem region failed\n");
 862                         mutex_unlock(&s->ops_mutex);
 863                         return -EINVAL;
 864                 }
 865         }
 866         p_dev->_win |= CLIENT_WIN_REQ(w);
 867
 868         /* Configure the socket controller */
 869         win->map = w+1;
 870         win->flags = res->flags & WIN_FLAGS_MAP;
 871         win->speed = speed;
 872         win->card_start = 0;
 873
 874         if (s->ops->set_mem_map(s, win) != 0) {
 875                 dev_dbg(&p_dev->dev, "failed to set memory mapping\n");
 876                 mutex_unlock(&s->ops_mutex);
 877                 return -EIO;
 878         }
 879         s->state |= SOCKET_WIN_REQ(w);
 880
 881         /* Return window handle */
 882         if (s->features & SS_CAP_STATIC_MAP)
 883                 res->start = win->static_start;
 884         else
 885                 res->start = win->res->start;
 886
 887         /* convert to new-style resources */
 888         res->end += res->start - 1;
 889         res->flags &= ~WIN_FLAGS_REQ;
 890         res->flags |= (win->map << 2) | IORESOURCE_MEM;
 891         res->parent = win->res;
 892         if (win->res)
 893                 request_resource(&iomem_resource, res);
 894
 895         dev_dbg(&p_dev->dev, "request_window results in %pR\n", res);
 896
 897         mutex_unlock(&s->ops_mutex);
 898
 899         return 0;
 900 } /* pcmcia_request_window */
 901 EXPORT_SYMBOL(pcmcia_request_window);
 902
 903 void pcmcia_disable_device(struct pcmcia_device *p_dev)
 904 {
 905         int i;
 906         for (i = 0; i < MAX_WIN; i++) {
 907                 struct resource *res = p_dev->resource[MAX_IO_WIN + i];
 908                 if (res->flags & WIN_FLAGS_REQ)
 909                         pcmcia_release_window(p_dev, res);
 910         }
 911
 912         pcmcia_release_configuration(p_dev);
 913         pcmcia_release_io(p_dev);
 914         if (p_dev->_irq) {
 915                 free_irq(p_dev->irq, p_dev->priv);
 916                 p_dev->_irq = 0;
 917         }
 918 }
 919 EXPORT_SYMBOL(pcmcia_disable_device);