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) 2004-2010 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 */ 37static int io_speed; 38module_param(io_speed, int, 0444); 39 40 41int 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 49struct 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/** 59 * release_io_space() - release IO ports allocated with alloc_io_space() 60 * @s: pcmcia socket 61 * @res: resource to release 62 * 63 */ 64static void release_io_space(struct pcmcia_socket *s, struct resource *res) 65{ 66 resource_size_t num = resource_size(res); 67 int i; 68 69 dev_dbg(&s->dev, "release_io_space for %pR\n", res); 70 71 for (i = 0; i < MAX_IO_WIN; i++) { 72 if (!s->io[i].res) 73 continue; 74 if ((s->io[i].res->start <= res->start) && 75 (s->io[i].res->end >= res->end)) { 76 s->io[i].InUse -= num; 77 if (res->parent) 78 release_resource(res); 79 res->start = res->end = 0; 80 res->flags = IORESOURCE_IO; 81 /* Free the window if no one else is using it */ 82 if (s->io[i].InUse == 0) { 83 release_resource(s->io[i].res); 84 kfree(s->io[i].res); 85 s->io[i].res = NULL; 86 } 87 } 88 } 89} 90 91 92/** 93 * alloc_io_space() - allocate IO ports for use by a PCMCIA device 94 * @s: pcmcia socket 95 * @res: resource to allocate (begin: begin, end: size) 96 * @lines: number of IO lines decoded by the PCMCIA card 97 * 98 * Special stuff for managing IO windows, because they are scarce 99 */ 100static int alloc_io_space(struct pcmcia_socket *s, struct resource *res, 101 unsigned int lines) 102{ 103 unsigned int align; 104 unsigned int base = res->start; 105 unsigned int num = res->end; 106 int ret; 107 108 res->flags |= IORESOURCE_IO; 109 110 dev_dbg(&s->dev, "alloc_io_space request for %pR, %d lines\n", 111 res, lines); 112 113 align = base ? (lines ? 1<<lines : 0) : 1; 114 if (align && (align < num)) { 115 if (base) { 116 dev_dbg(&s->dev, "odd IO request\n"); 117 align = 0; 118 } else 119 while (align && (align < num)) 120 align <<= 1; 121 } 122 if (base & ~(align-1)) { 123 dev_dbg(&s->dev, "odd IO request\n"); 124 align = 0; 125 } 126 127 ret = s->resource_ops->find_io(s, res->flags, &base, num, align, 128 &res->parent); 129 if (ret) { 130 dev_dbg(&s->dev, "alloc_io_space request failed (%d)\n", ret); 131 return -EINVAL; 132 } 133 134 res->start = base; 135 res->end = res->start + num - 1; 136 137 if (res->parent) { 138 ret = request_resource(res->parent, res); 139 if (ret) { 140 dev_warn(&s->dev, 141 "request_resource %pR failed: %d\n", res, ret); 142 res->parent = NULL; 143 release_io_space(s, res); 144 } 145 } 146 dev_dbg(&s->dev, "alloc_io_space request result %d: %pR\n", ret, res); 147 return ret; 148} 149 150 151/** 152 * pcmcia_access_config() - read or write card configuration registers 153 * 154 * pcmcia_access_config() reads and writes configuration registers in 155 * attribute memory. Memory window 0 is reserved for this and the tuple 156 * reading services. Drivers must use pcmcia_read_config_byte() or 157 * pcmcia_write_config_byte(). 158 */ 159static int pcmcia_access_config(struct pcmcia_device *p_dev, 160 off_t where, u8 *val, 161 int (*accessf) (struct pcmcia_socket *s, 162 int attr, unsigned int addr, 163 unsigned int len, void *ptr)) 164{ 165 struct pcmcia_socket *s; 166 config_t *c; 167 int addr; 168 int ret = 0; 169 170 s = p_dev->socket; 171 172 mutex_lock(&s->ops_mutex); 173 c = p_dev->function_config; 174 175 if (!(c->state & CONFIG_LOCKED)) { 176 dev_dbg(&p_dev->dev, "Configuration isn't locked\n"); 177 mutex_unlock(&s->ops_mutex); 178 return -EACCES; 179 } 180 181 addr = (p_dev->config_base + where) >> 1; 182 183 ret = accessf(s, 1, addr, 1, val); 184 185 mutex_unlock(&s->ops_mutex); 186 187 return ret; 188} 189 190 191/** 192 * pcmcia_read_config_byte() - read a byte from a card configuration register 193 * 194 * pcmcia_read_config_byte() reads a byte from a configuration register in 195 * attribute memory. 196 */ 197int pcmcia_read_config_byte(struct pcmcia_device *p_dev, off_t where, u8 *val) 198{ 199 return pcmcia_access_config(p_dev, where, val, pcmcia_read_cis_mem); 200} 201EXPORT_SYMBOL(pcmcia_read_config_byte); 202 203 204/** 205 * pcmcia_write_config_byte() - write a byte to a card configuration register 206 * 207 * pcmcia_write_config_byte() writes a byte to a configuration register in 208 * attribute memory. 209 */ 210int pcmcia_write_config_byte(struct pcmcia_device *p_dev, off_t where, u8 val) 211{ 212 return pcmcia_access_config(p_dev, where, &val, pcmcia_write_cis_mem); 213} 214EXPORT_SYMBOL(pcmcia_write_config_byte); 215 216 217/** 218 * pcmcia_map_mem_page() - modify iomem window to point to a different offset 219 * @p_dev: pcmcia device 220 * @res: iomem resource already enabled by pcmcia_request_window() 221 * @offset: card_offset to map 222 * 223 * pcmcia_map_mem_page() modifies what can be read and written by accessing 224 * an iomem range previously enabled by pcmcia_request_window(), by setting 225 * the card_offset value to @offset. 226 */ 227int pcmcia_map_mem_page(struct pcmcia_device *p_dev, struct resource *res, 228 unsigned int offset) 229{ 230 struct pcmcia_socket *s = p_dev->socket; 231 unsigned int w; 232 int ret; 233 234 w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1; 235 if (w >= MAX_WIN) 236 return -EINVAL; 237 238 mutex_lock(&s->ops_mutex); 239 s->win[w].card_start = offset; 240 ret = s->ops->set_mem_map(s, &s->win[w]); 241 if (ret) 242 dev_warn(&p_dev->dev, "failed to set_mem_map\n"); 243 mutex_unlock(&s->ops_mutex); 244 return ret; 245} 246EXPORT_SYMBOL(pcmcia_map_mem_page); 247 248 249/** 250 * pcmcia_fixup_iowidth() - reduce io width to 8bit 251 * @p_dev: pcmcia device 252 * 253 * pcmcia_fixup_iowidth() allows a PCMCIA device driver to reduce the 254 * IO width to 8bit after having called pcmcia_enable_device() 255 * previously. 256 */ 257int pcmcia_fixup_iowidth(struct pcmcia_device *p_dev) 258{ 259 struct pcmcia_socket *s = p_dev->socket; 260 pccard_io_map io_off = { 0, 0, 0, 0, 1 }; 261 pccard_io_map io_on; 262 int i, ret = 0; 263 264 mutex_lock(&s->ops_mutex); 265 266 dev_dbg(&p_dev->dev, "fixup iowidth to 8bit\n"); 267 268 if (!(s->state & SOCKET_PRESENT) || 269 !(p_dev->function_config->state & CONFIG_LOCKED)) { 270 dev_dbg(&p_dev->dev, "No card? Config not locked?\n"); 271 ret = -EACCES; 272 goto unlock; 273 } 274 275 io_on.speed = io_speed; 276 for (i = 0; i < MAX_IO_WIN; i++) { 277 if (!s->io[i].res) 278 continue; 279 io_off.map = i; 280 io_on.map = i; 281 282 io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8; 283 io_on.start = s->io[i].res->start; 284 io_on.stop = s->io[i].res->end; 285 286 s->ops->set_io_map(s, &io_off); 287 mdelay(40); 288 s->ops->set_io_map(s, &io_on); 289 } 290unlock: 291 mutex_unlock(&s->ops_mutex); 292 293 return ret; 294} 295EXPORT_SYMBOL(pcmcia_fixup_iowidth); 296 297 298/** 299 * pcmcia_fixup_vpp() - set Vpp to a new voltage level 300 * @p_dev: pcmcia device 301 * @new_vpp: new Vpp voltage 302 * 303 * pcmcia_fixup_vpp() allows a PCMCIA device driver to set Vpp to 304 * a new voltage level between calls to pcmcia_enable_device() 305 * and pcmcia_disable_device(). 306 */ 307int pcmcia_fixup_vpp(struct pcmcia_device *p_dev, unsigned char new_vpp) 308{ 309 struct pcmcia_socket *s = p_dev->socket; 310 int ret = 0; 311 312 mutex_lock(&s->ops_mutex); 313 314 dev_dbg(&p_dev->dev, "fixup Vpp to %d\n", new_vpp); 315 316 if (!(s->state & SOCKET_PRESENT) || 317 !(p_dev->function_config->state & CONFIG_LOCKED)) { 318 dev_dbg(&p_dev->dev, "No card? Config not locked?\n"); 319 ret = -EACCES; 320 goto unlock; 321 } 322 323 s->socket.Vpp = new_vpp; 324 if (s->ops->set_socket(s, &s->socket)) { 325 dev_warn(&p_dev->dev, "Unable to set VPP\n"); 326 ret = -EIO; 327 goto unlock; 328 } 329 p_dev->vpp = new_vpp; 330 331unlock: 332 mutex_unlock(&s->ops_mutex); 333 334 return ret; 335} 336EXPORT_SYMBOL(pcmcia_fixup_vpp); 337 338 339/** 340 * pcmcia_release_configuration() - physically disable a PCMCIA device 341 * @p_dev: pcmcia device 342 * 343 * pcmcia_release_configuration() is the 1:1 counterpart to 344 * pcmcia_enable_device(): If a PCMCIA device is no longer used by any 345 * driver, the Vpp voltage is set to 0, IRQs will no longer be generated, 346 * and I/O ranges will be disabled. As pcmcia_release_io() and 347 * pcmcia_release_window() still need to be called, device drivers are 348 * expected to call pcmcia_disable_device() instead. 349 */ 350int pcmcia_release_configuration(struct pcmcia_device *p_dev) 351{ 352 pccard_io_map io = { 0, 0, 0, 0, 1 }; 353 struct pcmcia_socket *s = p_dev->socket; 354 config_t *c; 355 int i; 356 357 mutex_lock(&s->ops_mutex); 358 c = p_dev->function_config; 359 if (p_dev->_locked) { 360 p_dev->_locked = 0; 361 if (--(s->lock_count) == 0) { 362 s->socket.flags = SS_OUTPUT_ENA; /* Is this correct? */ 363 s->socket.Vpp = 0; 364 s->socket.io_irq = 0; 365 s->ops->set_socket(s, &s->socket); 366 } 367 } 368 if (c->state & CONFIG_LOCKED) { 369 c->state &= ~CONFIG_LOCKED; 370 if (c->state & CONFIG_IO_REQ) 371 for (i = 0; i < MAX_IO_WIN; i++) { 372 if (!s->io[i].res) 373 continue; 374 s->io[i].Config--; 375 if (s->io[i].Config != 0) 376 continue; 377 io.map = i; 378 s->ops->set_io_map(s, &io); 379 } 380 } 381 mutex_unlock(&s->ops_mutex); 382 383 return 0; 384} 385 386 387/** 388 * pcmcia_release_io() - release I/O allocated by a PCMCIA device 389 * @p_dev: pcmcia device 390 * 391 * pcmcia_release_io() releases the I/O ranges allocated by a PCMCIA 392 * device. This may be invoked some time after a card ejection has 393 * already dumped the actual socket configuration, so if the client is 394 * "stale", we don't bother checking the port ranges against the 395 * current socket values. 396 */ 397static int pcmcia_release_io(struct pcmcia_device *p_dev) 398{ 399 struct pcmcia_socket *s = p_dev->socket; 400 int ret = -EINVAL; 401 config_t *c; 402 403 mutex_lock(&s->ops_mutex); 404 if (!p_dev->_io) 405 goto out; 406 407 c = p_dev->function_config; 408 409 release_io_space(s, &c->io[0]); 410 411 if (c->io[1].end) 412 release_io_space(s, &c->io[1]); 413 414 p_dev->_io = 0; 415 c->state &= ~CONFIG_IO_REQ; 416 417out: 418 mutex_unlock(&s->ops_mutex); 419 420 return ret; 421} /* pcmcia_release_io */ 422 423 424/** 425 * pcmcia_release_window() - release reserved iomem for PCMCIA devices 426 * @p_dev: pcmcia device 427 * @res: iomem resource to release 428 * 429 * pcmcia_release_window() releases &struct resource *res which was 430 * previously reserved by calling pcmcia_request_window(). 431 */ 432int pcmcia_release_window(struct pcmcia_device *p_dev, struct resource *res) 433{ 434 struct pcmcia_socket *s = p_dev->socket; 435 pccard_mem_map *win; 436 unsigned int w; 437 438 dev_dbg(&p_dev->dev, "releasing window %pR\n", res); 439 440 w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1; 441 if (w >= MAX_WIN) 442 return -EINVAL; 443 444 mutex_lock(&s->ops_mutex); 445 win = &s->win[w]; 446 447 if (!(p_dev->_win & CLIENT_WIN_REQ(w))) { 448 dev_dbg(&p_dev->dev, "not releasing unknown window\n"); 449 mutex_unlock(&s->ops_mutex); 450 return -EINVAL; 451 } 452 453 /* Shut down memory window */ 454 win->flags &= ~MAP_ACTIVE; 455 s->ops->set_mem_map(s, win); 456 s->state &= ~SOCKET_WIN_REQ(w); 457 458 /* Release system memory */ 459 if (win->res) { 460 release_resource(res); 461 release_resource(win->res); 462 kfree(win->res); 463 win->res = NULL; 464 } 465 res->start = res->end = 0; 466 res->flags = IORESOURCE_MEM; 467 p_dev->_win &= ~CLIENT_WIN_REQ(w); 468 mutex_unlock(&s->ops_mutex); 469 470 return 0; 471} /* pcmcia_release_window */ 472EXPORT_SYMBOL(pcmcia_release_window); 473 474 475/** 476 * pcmcia_enable_device() - set up and activate a PCMCIA device 477 * @p_dev: the associated PCMCIA device 478 * 479 * pcmcia_enable_device() physically enables a PCMCIA device. It parses 480 * the flags passed to in @flags and stored in @p_dev->flags and sets up 481 * the Vpp voltage, enables the speaker line, I/O ports and store proper 482 * values to configuration registers. 483 */ 484int pcmcia_enable_device(struct pcmcia_device *p_dev) 485{ 486 int i; 487 unsigned int base; 488 struct pcmcia_socket *s = p_dev->socket; 489 config_t *c; 490 pccard_io_map iomap; 491 unsigned char status = 0; 492 unsigned char ext_status = 0; 493 unsigned char option = 0; 494 unsigned int flags = p_dev->config_flags; 495 496 if (!(s->state & SOCKET_PRESENT)) 497 return -ENODEV; 498 499 mutex_lock(&s->ops_mutex); 500 c = p_dev->function_config; 501 if (c->state & CONFIG_LOCKED) { 502 mutex_unlock(&s->ops_mutex); 503 dev_dbg(&p_dev->dev, "Configuration is locked\n"); 504 return -EACCES; 505 } 506 507 /* Do power control. We don't allow changes in Vcc. */ 508 s->socket.Vpp = p_dev->vpp; 509 if (s->ops->set_socket(s, &s->socket)) { 510 mutex_unlock(&s->ops_mutex); 511 dev_printk(KERN_WARNING, &p_dev->dev, 512 "Unable to set socket state\n"); 513 return -EINVAL; 514 } 515 516 /* Pick memory or I/O card, DMA mode, interrupt */ 517 if (p_dev->_io || flags & CONF_ENABLE_IRQ) 518 flags |= CONF_ENABLE_IOCARD; 519 if (flags & CONF_ENABLE_IOCARD) 520 s->socket.flags |= SS_IOCARD; 521 if (flags & CONF_ENABLE_ZVCARD) 522 s->socket.flags |= SS_ZVCARD | SS_IOCARD; 523 if (flags & CONF_ENABLE_SPKR) { 524 s->socket.flags |= SS_SPKR_ENA; 525 status = CCSR_AUDIO_ENA; 526 if (!(p_dev->config_regs & PRESENT_STATUS)) 527 dev_warn(&p_dev->dev, "speaker requested, but " 528 "PRESENT_STATUS not set!\n"); 529 } 530 if (flags & CONF_ENABLE_IRQ) 531 s->socket.io_irq = s->pcmcia_irq; 532 else 533 s->socket.io_irq = 0; 534 if (flags & CONF_ENABLE_ESR) { 535 p_dev->config_regs |= PRESENT_EXT_STATUS; 536 ext_status = ESR_REQ_ATTN_ENA; 537 } 538 s->ops->set_socket(s, &s->socket); 539 s->lock_count++; 540 541 dev_dbg(&p_dev->dev, 542 "enable_device: V %d, flags %x, base %x, regs %x, idx %x\n", 543 p_dev->vpp, flags, p_dev->config_base, p_dev->config_regs, 544 p_dev->config_index); 545 546 /* Set up CIS configuration registers */ 547 base = p_dev->config_base; 548 if (p_dev->config_regs & PRESENT_COPY) { 549 u16 tmp = 0; 550 dev_dbg(&p_dev->dev, "clearing CISREG_SCR\n"); 551 pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &tmp); 552 } 553 if (p_dev->config_regs & PRESENT_PIN_REPLACE) { 554 u16 tmp = 0; 555 dev_dbg(&p_dev->dev, "clearing CISREG_PRR\n"); 556 pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &tmp); 557 } 558 if (p_dev->config_regs & PRESENT_OPTION) { 559 if (s->functions == 1) { 560 option = p_dev->config_index & COR_CONFIG_MASK; 561 } else { 562 option = p_dev->config_index & COR_MFC_CONFIG_MASK; 563 option |= COR_FUNC_ENA|COR_IREQ_ENA; 564 if (p_dev->config_regs & PRESENT_IOBASE_0) 565 option |= COR_ADDR_DECODE; 566 } 567 if ((flags & CONF_ENABLE_IRQ) && 568 !(flags & CONF_ENABLE_PULSE_IRQ)) 569 option |= COR_LEVEL_REQ; 570 pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &option); 571 mdelay(40); 572 } 573 if (p_dev->config_regs & PRESENT_STATUS) 574 pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &status); 575 576 if (p_dev->config_regs & PRESENT_EXT_STATUS) 577 pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1, 578 &ext_status); 579 580 if (p_dev->config_regs & PRESENT_IOBASE_0) { 581 u8 b = c->io[0].start & 0xff; 582 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b); 583 b = (c->io[0].start >> 8) & 0xff; 584 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b); 585 } 586 if (p_dev->config_regs & PRESENT_IOSIZE) { 587 u8 b = resource_size(&c->io[0]) + resource_size(&c->io[1]) - 1; 588 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b); 589 } 590 591 /* Configure I/O windows */ 592 if (c->state & CONFIG_IO_REQ) { 593 iomap.speed = io_speed; 594 for (i = 0; i < MAX_IO_WIN; i++) 595 if (s->io[i].res) { 596 iomap.map = i; 597 iomap.flags = MAP_ACTIVE; 598 switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) { 599 case IO_DATA_PATH_WIDTH_16: 600 iomap.flags |= MAP_16BIT; break; 601 case IO_DATA_PATH_WIDTH_AUTO: 602 iomap.flags |= MAP_AUTOSZ; break; 603 default: 604 break; 605 } 606 iomap.start = s->io[i].res->start; 607 iomap.stop = s->io[i].res->end; 608 s->ops->set_io_map(s, &iomap); 609 s->io[i].Config++; 610 } 611 } 612 613 c->state |= CONFIG_LOCKED; 614 p_dev->_locked = 1; 615 mutex_unlock(&s->ops_mutex); 616 return 0; 617} /* pcmcia_enable_device */ 618EXPORT_SYMBOL(pcmcia_enable_device); 619 620 621/** 622 * pcmcia_request_io() - attempt to reserve port ranges for PCMCIA devices 623 * @p_dev: the associated PCMCIA device 624 * 625 * pcmcia_request_io() attempts to reserve the IO port ranges specified in 626 * &struct pcmcia_device @p_dev->resource[0] and @p_dev->resource[1]. The 627 * "start" value is the requested start of the IO port resource; "end" 628 * reflects the number of ports requested. The number of IO lines requested 629 * is specified in &struct pcmcia_device @p_dev->io_lines. 630 */ 631int pcmcia_request_io(struct pcmcia_device *p_dev) 632{ 633 struct pcmcia_socket *s = p_dev->socket; 634 config_t *c = p_dev->function_config; 635 int ret = -EINVAL; 636 637 mutex_lock(&s->ops_mutex); 638 dev_dbg(&p_dev->dev, "pcmcia_request_io: %pR , %pR", 639 &c->io[0], &c->io[1]); 640 641 if (!(s->state & SOCKET_PRESENT)) { 642 dev_dbg(&p_dev->dev, "pcmcia_request_io: No card present\n"); 643 goto out; 644 } 645 646 if (c->state & CONFIG_LOCKED) { 647 dev_dbg(&p_dev->dev, "Configuration is locked\n"); 648 goto out; 649 } 650 if (c->state & CONFIG_IO_REQ) { 651 dev_dbg(&p_dev->dev, "IO already configured\n"); 652 goto out; 653 } 654 655 ret = alloc_io_space(s, &c->io[0], p_dev->io_lines); 656 if (ret) 657 goto out; 658 659 if (c->io[1].end) { 660 ret = alloc_io_space(s, &c->io[1], p_dev->io_lines); 661 if (ret) { 662 struct resource tmp = c->io[0]; 663 /* release the previously allocated resource */ 664 release_io_space(s, &c->io[0]); 665 /* but preserve the settings, for they worked... */ 666 c->io[0].end = resource_size(&tmp); 667 c->io[0].start = tmp.start; 668 c->io[0].flags = tmp.flags; 669 goto out; 670 } 671 } else 672 c->io[1].start = 0; 673 674 c->state |= CONFIG_IO_REQ; 675 p_dev->_io = 1; 676 677 dev_dbg(&p_dev->dev, "pcmcia_request_io succeeded: %pR , %pR", 678 &c->io[0], &c->io[1]); 679out: 680 mutex_unlock(&s->ops_mutex); 681 682 return ret; 683} /* pcmcia_request_io */ 684EXPORT_SYMBOL(pcmcia_request_io); 685 686 687/** 688 * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device 689 * @p_dev: the associated PCMCIA device 690 * @handler: IRQ handler to register 691 * 692 * pcmcia_request_irq() is a wrapper around request_irq() which allows 693 * the PCMCIA core to clean up the registration in pcmcia_disable_device(). 694 * Drivers are free to use request_irq() directly, but then they need to 695 * call free_irq() themselfves, too. Also, only %IRQF_SHARED capable IRQ 696 * handlers are allowed. 697 */ 698int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev, 699 irq_handler_t handler) 700{ 701 int ret; 702 703 if (!p_dev->irq) 704 return -EINVAL; 705 706 ret = request_irq(p_dev->irq, handler, IRQF_SHARED, 707 p_dev->devname, p_dev->priv); 708 if (!ret) 709 p_dev->_irq = 1; 710 711 return ret; 712} 713EXPORT_SYMBOL(pcmcia_request_irq); 714 715 716/** 717 * pcmcia_request_exclusive_irq() - attempt to request an exclusive IRQ first 718 * @p_dev: the associated PCMCIA device 719 * @handler: IRQ handler to register 720 * 721 * pcmcia_request_exclusive_irq() is a wrapper around request_irq() which 722 * attempts first to request an exclusive IRQ. If it fails, it also accepts 723 * a shared IRQ, but prints out a warning. PCMCIA drivers should allow for 724 * IRQ sharing and either use request_irq directly (then they need to call 725 * free_irq() themselves, too), or the pcmcia_request_irq() function. 726 */ 727int __must_check 728__pcmcia_request_exclusive_irq(struct pcmcia_device *p_dev, 729 irq_handler_t handler) 730{ 731 int ret; 732 733 if (!p_dev->irq) 734 return -EINVAL; 735 736 ret = request_irq(p_dev->irq, handler, 0, p_dev->devname, p_dev->priv); 737 if (ret) { 738 ret = pcmcia_request_irq(p_dev, handler); 739 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: " 740 "request for exclusive IRQ could not be fulfilled.\n"); 741 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver " 742 "needs updating to supported shared IRQ lines.\n"); 743 } 744 if (ret) 745 dev_printk(KERN_INFO, &p_dev->dev, "request_irq() failed\n"); 746 else 747 p_dev->_irq = 1; 748 749 return ret; 750} /* pcmcia_request_exclusive_irq */ 751EXPORT_SYMBOL(__pcmcia_request_exclusive_irq); 752 753 754#ifdef CONFIG_PCMCIA_PROBE 755 756/* mask of IRQs already reserved by other cards, we should avoid using them */ 757static u8 pcmcia_used_irq[32]; 758 759static irqreturn_t test_action(int cpl, void *dev_id) 760{ 761 return IRQ_NONE; 762} 763 764/** 765 * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used 766 * @p_dev - the associated PCMCIA device 767 * 768 * locking note: must be called with ops_mutex locked. 769 */ 770static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type) 771{ 772 struct pcmcia_socket *s = p_dev->socket; 773 unsigned int try, irq; 774 u32 mask = s->irq_mask; 775 int ret = -ENODEV; 776 777 for (try = 0; try < 64; try++) { 778 irq = try % 32; 779 780 if (irq > NR_IRQS) 781 continue; 782 783 /* marked as available by driver, not blocked by userspace? */ 784 if (!((mask >> irq) & 1)) 785 continue; 786 787 /* avoid an IRQ which is already used by another PCMCIA card */ 788 if ((try < 32) && pcmcia_used_irq[irq]) 789 continue; 790 791 /* register the correct driver, if possible, to check whether 792 * registering a dummy handle works, i.e. if the IRQ isn't 793 * marked as used by the kernel resource management core */ 794 ret = request_irq(irq, test_action, type, p_dev->devname, 795 p_dev); 796 if (!ret) { 797 free_irq(irq, p_dev); 798 p_dev->irq = s->pcmcia_irq = irq; 799 pcmcia_used_irq[irq]++; 800 break; 801 } 802 } 803 804 return ret; 805} 806 807void pcmcia_cleanup_irq(struct pcmcia_socket *s) 808{ 809 pcmcia_used_irq[s->pcmcia_irq]--; 810 s->pcmcia_irq = 0; 811} 812 813#else /* CONFIG_PCMCIA_PROBE */ 814 815static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type) 816{ 817 return -EINVAL; 818} 819 820void pcmcia_cleanup_irq(struct pcmcia_socket *s) 821{ 822 s->pcmcia_irq = 0; 823 return; 824} 825 826#endif /* CONFIG_PCMCIA_PROBE */ 827 828 829/** 830 * pcmcia_setup_irq() - determine IRQ to be used for device 831 * @p_dev - the associated PCMCIA device 832 * 833 * locking note: must be called with ops_mutex locked. 834 */ 835int pcmcia_setup_irq(struct pcmcia_device *p_dev) 836{ 837 struct pcmcia_socket *s = p_dev->socket; 838 839 if (p_dev->irq) 840 return 0; 841 842 /* already assigned? */ 843 if (s->pcmcia_irq) { 844 p_dev->irq = s->pcmcia_irq; 845 return 0; 846 } 847 848 /* prefer an exclusive ISA irq */ 849 if (!pcmcia_setup_isa_irq(p_dev, 0)) 850 return 0; 851 852 /* but accept a shared ISA irq */ 853 if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED)) 854 return 0; 855 856 /* but use the PCI irq otherwise */ 857 if (s->pci_irq) { 858 p_dev->irq = s->pcmcia_irq = s->pci_irq; 859 return 0; 860 } 861 862 return -EINVAL; 863} 864 865 866/** 867 * pcmcia_request_window() - attempt to reserve iomem for PCMCIA devices 868 * @p_dev: the associated PCMCIA device 869 * @res: &struct resource pointing to p_dev->resource[2..5] 870 * @speed: access speed 871 * 872 * pcmcia_request_window() attepts to reserve an iomem ranges specified in 873 * &struct resource @res pointing to one of the entries in 874 * &struct pcmcia_device @p_dev->resource[2..5]. The "start" value is the 875 * requested start of the IO mem resource; "end" reflects the size 876 * requested. 877 */ 878int pcmcia_request_window(struct pcmcia_device *p_dev, struct resource *res, 879 unsigned int speed) 880{ 881 struct pcmcia_socket *s = p_dev->socket; 882 pccard_mem_map *win; 883 u_long align; 884 int w; 885 886 dev_dbg(&p_dev->dev, "request_window %pR %d\n", res, speed); 887 888 if (!(s->state & SOCKET_PRESENT)) { 889 dev_dbg(&p_dev->dev, "No card present\n"); 890 return -ENODEV; 891 } 892 893 /* Window size defaults to smallest available */ 894 if (res->end == 0) 895 res->end = s->map_size; 896 align = (s->features & SS_CAP_MEM_ALIGN) ? res->end : s->map_size; 897 if (res->end & (s->map_size-1)) { 898 dev_dbg(&p_dev->dev, "invalid map size\n"); 899 return -EINVAL; 900 } 901 if ((res->start && (s->features & SS_CAP_STATIC_MAP)) || 902 (res->start & (align-1))) { 903 dev_dbg(&p_dev->dev, "invalid base address\n"); 904 return -EINVAL; 905 } 906 if (res->start) 907 align = 0; 908 909 /* Allocate system memory window */ 910 mutex_lock(&s->ops_mutex); 911 for (w = 0; w < MAX_WIN; w++) 912 if (!(s->state & SOCKET_WIN_REQ(w))) 913 break; 914 if (w == MAX_WIN) { 915 dev_dbg(&p_dev->dev, "all windows are used already\n"); 916 mutex_unlock(&s->ops_mutex); 917 return -EINVAL; 918 } 919 920 win = &s->win[w]; 921 922 if (!(s->features & SS_CAP_STATIC_MAP)) { 923 win->res = pcmcia_find_mem_region(res->start, res->end, align, 924 0, s); 925 if (!win->res) { 926 dev_dbg(&p_dev->dev, "allocating mem region failed\n"); 927 mutex_unlock(&s->ops_mutex); 928 return -EINVAL; 929 } 930 } 931 p_dev->_win |= CLIENT_WIN_REQ(w); 932 933 /* Configure the socket controller */ 934 win->map = w+1; 935 win->flags = res->flags & WIN_FLAGS_MAP; 936 win->speed = speed; 937 win->card_start = 0; 938 939 if (s->ops->set_mem_map(s, win) != 0) { 940 dev_dbg(&p_dev->dev, "failed to set memory mapping\n"); 941 mutex_unlock(&s->ops_mutex); 942 return -EIO; 943 } 944 s->state |= SOCKET_WIN_REQ(w); 945 946 /* Return window handle */ 947 if (s->features & SS_CAP_STATIC_MAP) 948 res->start = win->static_start; 949 else 950 res->start = win->res->start; 951 952 /* convert to new-style resources */ 953 res->end += res->start - 1; 954 res->flags &= ~WIN_FLAGS_REQ; 955 res->flags |= (win->map << 2) | IORESOURCE_MEM; 956 res->parent = win->res; 957 if (win->res) 958 request_resource(&iomem_resource, res); 959 960 dev_dbg(&p_dev->dev, "request_window results in %pR\n", res); 961 962 mutex_unlock(&s->ops_mutex); 963 964 return 0; 965} /* pcmcia_request_window */ 966EXPORT_SYMBOL(pcmcia_request_window); 967 968 969/** 970 * pcmcia_disable_device() - disable and clean up a PCMCIA device 971 * @p_dev: the associated PCMCIA device 972 * 973 * pcmcia_disable_device() is the driver-callable counterpart to 974 * pcmcia_enable_device(): If a PCMCIA device is no longer used, 975 * drivers are expected to clean up and disable the device by calling 976 * this function. Any I/O ranges (iomem and ioports) will be released, 977 * the Vpp voltage will be set to 0, and IRQs will no longer be 978 * generated -- at least if there is no other card function (of 979 * multifunction devices) being used. 980 */ 981void pcmcia_disable_device(struct pcmcia_device *p_dev) 982{ 983 int i; 984 985 dev_dbg(&p_dev->dev, "disabling device\n"); 986 987 for (i = 0; i < MAX_WIN; i++) { 988 struct resource *res = p_dev->resource[MAX_IO_WIN + i]; 989 if (res->flags & WIN_FLAGS_REQ) 990 pcmcia_release_window(p_dev, res); 991 } 992 993 pcmcia_release_configuration(p_dev); 994 pcmcia_release_io(p_dev); 995 if (p_dev->_irq) { 996 free_irq(p_dev->irq, p_dev->priv); 997 p_dev->_irq = 0; 998 } 999} 1000EXPORT_SYMBOL(pcmcia_disable_device); 1001