1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * PCMCIA 16-bit resource management functions 4 * 5 * The initial developer of the original code is David A. Hinds 6 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds 7 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved. 8 * 9 * Copyright (C) 1999 David A. Hinds 10 * Copyright (C) 2004-2010 Dominik Brodowski 11 */ 12 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/interrupt.h> 16 #include <linux/delay.h> 17 #include <linux/pci.h> 18 #include <linux/device.h> 19 #include <linux/netdevice.h> 20 #include <linux/slab.h> 21 22 #include <asm/irq.h> 23 24 #include <pcmcia/ss.h> 25 #include <pcmcia/cistpl.h> 26 #include <pcmcia/cisreg.h> 27 #include <pcmcia/ds.h> 28 29 #include "cs_internal.h" 30 31 32 /* Access speed for IO windows */ 33 static int io_speed; 34 module_param(io_speed, int, 0444); 35 36 37 int pcmcia_validate_mem(struct pcmcia_socket *s) 38 { 39 if (s->resource_ops->validate_mem) 40 return s->resource_ops->validate_mem(s); 41 /* if there is no callback, we can assume that everything is OK */ 42 return 0; 43 } 44 45 struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align, 46 int low, struct pcmcia_socket *s) 47 { 48 if (s->resource_ops->find_mem) 49 return s->resource_ops->find_mem(base, num, align, low, s); 50 return NULL; 51 } 52 53 54 /** 55 * release_io_space() - release IO ports allocated with alloc_io_space() 56 * @s: pcmcia socket 57 * @res: resource to release 58 * 59 */ 60 static void release_io_space(struct pcmcia_socket *s, struct resource *res) 61 { 62 resource_size_t num = resource_size(res); 63 int i; 64 65 dev_dbg(&s->dev, "release_io_space for %pR\n", res); 66 67 for (i = 0; i < MAX_IO_WIN; i++) { 68 if (!s->io[i].res) 69 continue; 70 if ((s->io[i].res->start <= res->start) && 71 (s->io[i].res->end >= res->end)) { 72 s->io[i].InUse -= num; 73 if (res->parent) 74 release_resource(res); 75 res->start = res->end = 0; 76 res->flags = IORESOURCE_IO; 77 /* Free the window if no one else is using it */ 78 if (s->io[i].InUse == 0) { 79 release_resource(s->io[i].res); 80 kfree(s->io[i].res); 81 s->io[i].res = NULL; 82 } 83 } 84 } 85 } 86 87 88 /** 89 * alloc_io_space() - allocate IO ports for use by a PCMCIA device 90 * @s: pcmcia socket 91 * @res: resource to allocate (begin: begin, end: size) 92 * @lines: number of IO lines decoded by the PCMCIA card 93 * 94 * Special stuff for managing IO windows, because they are scarce 95 */ 96 static int alloc_io_space(struct pcmcia_socket *s, struct resource *res, 97 unsigned int lines) 98 { 99 unsigned int align; 100 unsigned int base = res->start; 101 unsigned int num = res->end; 102 int ret; 103 104 res->flags |= IORESOURCE_IO; 105 106 dev_dbg(&s->dev, "alloc_io_space request for %pR, %d lines\n", 107 res, lines); 108 109 align = base ? (lines ? 1<<lines : 0) : 1; 110 if (align && (align < num)) { 111 if (base) { 112 dev_dbg(&s->dev, "odd IO request\n"); 113 align = 0; 114 } else 115 while (align && (align < num)) 116 align <<= 1; 117 } 118 if (base & ~(align-1)) { 119 dev_dbg(&s->dev, "odd IO request\n"); 120 align = 0; 121 } 122 123 ret = s->resource_ops->find_io(s, res->flags, &base, num, align, 124 &res->parent); 125 if (ret) { 126 dev_dbg(&s->dev, "alloc_io_space request failed (%d)\n", ret); 127 return -EINVAL; 128 } 129 130 res->start = base; 131 res->end = res->start + num - 1; 132 133 if (res->parent) { 134 ret = request_resource(res->parent, res); 135 if (ret) { 136 dev_warn(&s->dev, 137 "request_resource %pR failed: %d\n", res, ret); 138 res->parent = NULL; 139 release_io_space(s, res); 140 } 141 } 142 dev_dbg(&s->dev, "alloc_io_space request result %d: %pR\n", ret, res); 143 return ret; 144 } 145 146 147 /* 148 * pcmcia_access_config() - read or write card configuration registers 149 * 150 * pcmcia_access_config() reads and writes configuration registers in 151 * attribute memory. Memory window 0 is reserved for this and the tuple 152 * reading services. Drivers must use pcmcia_read_config_byte() or 153 * pcmcia_write_config_byte(). 154 */ 155 static int pcmcia_access_config(struct pcmcia_device *p_dev, 156 off_t where, u8 *val, 157 int (*accessf) (struct pcmcia_socket *s, 158 int attr, unsigned int addr, 159 unsigned int len, void *ptr)) 160 { 161 struct pcmcia_socket *s; 162 config_t *c; 163 int addr; 164 int ret = 0; 165 166 s = p_dev->socket; 167 168 mutex_lock(&s->ops_mutex); 169 c = p_dev->function_config; 170 171 if (!(c->state & CONFIG_LOCKED)) { 172 dev_dbg(&p_dev->dev, "Configuration isn't locked\n"); 173 mutex_unlock(&s->ops_mutex); 174 return -EACCES; 175 } 176 177 addr = (p_dev->config_base + where) >> 1; 178 179 ret = accessf(s, 1, addr, 1, val); 180 181 mutex_unlock(&s->ops_mutex); 182 183 return ret; 184 } 185 186 187 /* 188 * pcmcia_read_config_byte() - read a byte from a card configuration register 189 * 190 * pcmcia_read_config_byte() reads a byte from a configuration register in 191 * attribute memory. 192 */ 193 int pcmcia_read_config_byte(struct pcmcia_device *p_dev, off_t where, u8 *val) 194 { 195 return pcmcia_access_config(p_dev, where, val, pcmcia_read_cis_mem); 196 } 197 EXPORT_SYMBOL(pcmcia_read_config_byte); 198 199 200 /* 201 * pcmcia_write_config_byte() - write a byte to a card configuration register 202 * 203 * pcmcia_write_config_byte() writes a byte to a configuration register in 204 * attribute memory. 205 */ 206 int pcmcia_write_config_byte(struct pcmcia_device *p_dev, off_t where, u8 val) 207 { 208 return pcmcia_access_config(p_dev, where, &val, pcmcia_write_cis_mem); 209 } 210 EXPORT_SYMBOL(pcmcia_write_config_byte); 211 212 213 /** 214 * pcmcia_map_mem_page() - modify iomem window to point to a different offset 215 * @p_dev: pcmcia device 216 * @res: iomem resource already enabled by pcmcia_request_window() 217 * @offset: card_offset to map 218 * 219 * pcmcia_map_mem_page() modifies what can be read and written by accessing 220 * an iomem range previously enabled by pcmcia_request_window(), by setting 221 * the card_offset value to @offset. 222 */ 223 int pcmcia_map_mem_page(struct pcmcia_device *p_dev, struct resource *res, 224 unsigned int offset) 225 { 226 struct pcmcia_socket *s = p_dev->socket; 227 unsigned int w; 228 int ret; 229 230 w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1; 231 if (w >= MAX_WIN) 232 return -EINVAL; 233 234 mutex_lock(&s->ops_mutex); 235 s->win[w].card_start = offset; 236 ret = s->ops->set_mem_map(s, &s->win[w]); 237 if (ret) 238 dev_warn(&p_dev->dev, "failed to set_mem_map\n"); 239 mutex_unlock(&s->ops_mutex); 240 return ret; 241 } 242 EXPORT_SYMBOL(pcmcia_map_mem_page); 243 244 245 /** 246 * pcmcia_fixup_iowidth() - reduce io width to 8bit 247 * @p_dev: pcmcia device 248 * 249 * pcmcia_fixup_iowidth() allows a PCMCIA device driver to reduce the 250 * IO width to 8bit after having called pcmcia_enable_device() 251 * previously. 252 */ 253 int pcmcia_fixup_iowidth(struct pcmcia_device *p_dev) 254 { 255 struct pcmcia_socket *s = p_dev->socket; 256 pccard_io_map io_off = { 0, 0, 0, 0, 1 }; 257 pccard_io_map io_on; 258 int i, ret = 0; 259 260 mutex_lock(&s->ops_mutex); 261 262 dev_dbg(&p_dev->dev, "fixup iowidth to 8bit\n"); 263 264 if (!(s->state & SOCKET_PRESENT) || 265 !(p_dev->function_config->state & CONFIG_LOCKED)) { 266 dev_dbg(&p_dev->dev, "No card? Config not locked?\n"); 267 ret = -EACCES; 268 goto unlock; 269 } 270 271 io_on.speed = io_speed; 272 for (i = 0; i < MAX_IO_WIN; i++) { 273 if (!s->io[i].res) 274 continue; 275 io_off.map = i; 276 io_on.map = i; 277 278 io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8; 279 io_on.start = s->io[i].res->start; 280 io_on.stop = s->io[i].res->end; 281 282 s->ops->set_io_map(s, &io_off); 283 msleep(40); 284 s->ops->set_io_map(s, &io_on); 285 } 286 unlock: 287 mutex_unlock(&s->ops_mutex); 288 289 return ret; 290 } 291 EXPORT_SYMBOL(pcmcia_fixup_iowidth); 292 293 294 /** 295 * pcmcia_fixup_vpp() - set Vpp to a new voltage level 296 * @p_dev: pcmcia device 297 * @new_vpp: new Vpp voltage 298 * 299 * pcmcia_fixup_vpp() allows a PCMCIA device driver to set Vpp to 300 * a new voltage level between calls to pcmcia_enable_device() 301 * and pcmcia_disable_device(). 302 */ 303 int pcmcia_fixup_vpp(struct pcmcia_device *p_dev, unsigned char new_vpp) 304 { 305 struct pcmcia_socket *s = p_dev->socket; 306 int ret = 0; 307 308 mutex_lock(&s->ops_mutex); 309 310 dev_dbg(&p_dev->dev, "fixup Vpp to %d\n", new_vpp); 311 312 if (!(s->state & SOCKET_PRESENT) || 313 !(p_dev->function_config->state & CONFIG_LOCKED)) { 314 dev_dbg(&p_dev->dev, "No card? Config not locked?\n"); 315 ret = -EACCES; 316 goto unlock; 317 } 318 319 s->socket.Vpp = new_vpp; 320 if (s->ops->set_socket(s, &s->socket)) { 321 dev_warn(&p_dev->dev, "Unable to set VPP\n"); 322 ret = -EIO; 323 goto unlock; 324 } 325 p_dev->vpp = new_vpp; 326 327 unlock: 328 mutex_unlock(&s->ops_mutex); 329 330 return ret; 331 } 332 EXPORT_SYMBOL(pcmcia_fixup_vpp); 333 334 335 /** 336 * pcmcia_release_configuration() - physically disable a PCMCIA device 337 * @p_dev: pcmcia device 338 * 339 * pcmcia_release_configuration() is the 1:1 counterpart to 340 * pcmcia_enable_device(): If a PCMCIA device is no longer used by any 341 * driver, the Vpp voltage is set to 0, IRQs will no longer be generated, 342 * and I/O ranges will be disabled. As pcmcia_release_io() and 343 * pcmcia_release_window() still need to be called, device drivers are 344 * expected to call pcmcia_disable_device() instead. 345 */ 346 int pcmcia_release_configuration(struct pcmcia_device *p_dev) 347 { 348 pccard_io_map io = { 0, 0, 0, 0, 1 }; 349 struct pcmcia_socket *s = p_dev->socket; 350 config_t *c; 351 int i; 352 353 mutex_lock(&s->ops_mutex); 354 c = p_dev->function_config; 355 if (p_dev->_locked) { 356 p_dev->_locked = 0; 357 if (--(s->lock_count) == 0) { 358 s->socket.flags = SS_OUTPUT_ENA; /* Is this correct? */ 359 s->socket.Vpp = 0; 360 s->socket.io_irq = 0; 361 s->ops->set_socket(s, &s->socket); 362 } 363 } 364 if (c->state & CONFIG_LOCKED) { 365 c->state &= ~CONFIG_LOCKED; 366 if (c->state & CONFIG_IO_REQ) 367 for (i = 0; i < MAX_IO_WIN; i++) { 368 if (!s->io[i].res) 369 continue; 370 s->io[i].Config--; 371 if (s->io[i].Config != 0) 372 continue; 373 io.map = i; 374 s->ops->set_io_map(s, &io); 375 } 376 } 377 mutex_unlock(&s->ops_mutex); 378 379 return 0; 380 } 381 382 383 /** 384 * pcmcia_release_io() - release I/O allocated by a PCMCIA device 385 * @p_dev: pcmcia device 386 * 387 * pcmcia_release_io() releases the I/O ranges allocated by a PCMCIA 388 * device. This may be invoked some time after a card ejection has 389 * already dumped the actual socket configuration, so if the client is 390 * "stale", we don't bother checking the port ranges against the 391 * current socket values. 392 */ 393 static int pcmcia_release_io(struct pcmcia_device *p_dev) 394 { 395 struct pcmcia_socket *s = p_dev->socket; 396 int ret = -EINVAL; 397 config_t *c; 398 399 mutex_lock(&s->ops_mutex); 400 if (!p_dev->_io) 401 goto out; 402 403 c = p_dev->function_config; 404 405 release_io_space(s, &c->io[0]); 406 407 if (c->io[1].end) 408 release_io_space(s, &c->io[1]); 409 410 p_dev->_io = 0; 411 c->state &= ~CONFIG_IO_REQ; 412 413 out: 414 mutex_unlock(&s->ops_mutex); 415 416 return ret; 417 } /* pcmcia_release_io */ 418 419 420 /** 421 * pcmcia_release_window() - release reserved iomem for PCMCIA devices 422 * @p_dev: pcmcia device 423 * @res: iomem resource to release 424 * 425 * pcmcia_release_window() releases &struct resource *res which was 426 * previously reserved by calling pcmcia_request_window(). 427 */ 428 int pcmcia_release_window(struct pcmcia_device *p_dev, struct resource *res) 429 { 430 struct pcmcia_socket *s = p_dev->socket; 431 pccard_mem_map *win; 432 unsigned int w; 433 434 dev_dbg(&p_dev->dev, "releasing window %pR\n", res); 435 436 w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1; 437 if (w >= MAX_WIN) 438 return -EINVAL; 439 440 mutex_lock(&s->ops_mutex); 441 win = &s->win[w]; 442 443 if (!(p_dev->_win & CLIENT_WIN_REQ(w))) { 444 dev_dbg(&p_dev->dev, "not releasing unknown window\n"); 445 mutex_unlock(&s->ops_mutex); 446 return -EINVAL; 447 } 448 449 /* Shut down memory window */ 450 win->flags &= ~MAP_ACTIVE; 451 s->ops->set_mem_map(s, win); 452 s->state &= ~SOCKET_WIN_REQ(w); 453 454 /* Release system memory */ 455 if (win->res) { 456 release_resource(res); 457 release_resource(win->res); 458 kfree(win->res); 459 win->res = NULL; 460 } 461 res->start = res->end = 0; 462 res->flags = IORESOURCE_MEM; 463 p_dev->_win &= ~CLIENT_WIN_REQ(w); 464 mutex_unlock(&s->ops_mutex); 465 466 return 0; 467 } /* pcmcia_release_window */ 468 EXPORT_SYMBOL(pcmcia_release_window); 469 470 471 /** 472 * pcmcia_enable_device() - set up and activate a PCMCIA device 473 * @p_dev: the associated PCMCIA device 474 * 475 * pcmcia_enable_device() physically enables a PCMCIA device. It parses 476 * the flags passed to in @flags and stored in @p_dev->flags and sets up 477 * the Vpp voltage, enables the speaker line, I/O ports and store proper 478 * values to configuration registers. 479 */ 480 int pcmcia_enable_device(struct pcmcia_device *p_dev) 481 { 482 int i; 483 unsigned int base; 484 struct pcmcia_socket *s = p_dev->socket; 485 config_t *c; 486 pccard_io_map iomap; 487 unsigned char status = 0; 488 unsigned char ext_status = 0; 489 unsigned char option = 0; 490 unsigned int flags = p_dev->config_flags; 491 492 if (!(s->state & SOCKET_PRESENT)) 493 return -ENODEV; 494 495 mutex_lock(&s->ops_mutex); 496 c = p_dev->function_config; 497 if (c->state & CONFIG_LOCKED) { 498 mutex_unlock(&s->ops_mutex); 499 dev_dbg(&p_dev->dev, "Configuration is locked\n"); 500 return -EACCES; 501 } 502 503 /* Do power control. We don't allow changes in Vcc. */ 504 s->socket.Vpp = p_dev->vpp; 505 if (s->ops->set_socket(s, &s->socket)) { 506 mutex_unlock(&s->ops_mutex); 507 dev_warn(&p_dev->dev, "Unable to set socket state\n"); 508 return -EINVAL; 509 } 510 511 /* Pick memory or I/O card, DMA mode, interrupt */ 512 if (p_dev->_io || flags & CONF_ENABLE_IRQ) 513 flags |= CONF_ENABLE_IOCARD; 514 if (flags & CONF_ENABLE_IOCARD) 515 s->socket.flags |= SS_IOCARD; 516 if (flags & CONF_ENABLE_ZVCARD) 517 s->socket.flags |= SS_ZVCARD | SS_IOCARD; 518 if (flags & CONF_ENABLE_SPKR) { 519 s->socket.flags |= SS_SPKR_ENA; 520 status = CCSR_AUDIO_ENA; 521 if (!(p_dev->config_regs & PRESENT_STATUS)) 522 dev_warn(&p_dev->dev, "speaker requested, but " 523 "PRESENT_STATUS not set!\n"); 524 } 525 if (flags & CONF_ENABLE_IRQ) 526 s->socket.io_irq = s->pcmcia_irq; 527 else 528 s->socket.io_irq = 0; 529 if (flags & CONF_ENABLE_ESR) { 530 p_dev->config_regs |= PRESENT_EXT_STATUS; 531 ext_status = ESR_REQ_ATTN_ENA; 532 } 533 s->ops->set_socket(s, &s->socket); 534 s->lock_count++; 535 536 dev_dbg(&p_dev->dev, 537 "enable_device: V %d, flags %x, base %x, regs %x, idx %x\n", 538 p_dev->vpp, flags, p_dev->config_base, p_dev->config_regs, 539 p_dev->config_index); 540 541 /* Set up CIS configuration registers */ 542 base = p_dev->config_base; 543 if (p_dev->config_regs & PRESENT_COPY) { 544 u16 tmp = 0; 545 dev_dbg(&p_dev->dev, "clearing CISREG_SCR\n"); 546 pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &tmp); 547 } 548 if (p_dev->config_regs & PRESENT_PIN_REPLACE) { 549 u16 tmp = 0; 550 dev_dbg(&p_dev->dev, "clearing CISREG_PRR\n"); 551 pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &tmp); 552 } 553 if (p_dev->config_regs & PRESENT_OPTION) { 554 if (s->functions == 1) { 555 option = p_dev->config_index & COR_CONFIG_MASK; 556 } else { 557 option = p_dev->config_index & COR_MFC_CONFIG_MASK; 558 option |= COR_FUNC_ENA|COR_IREQ_ENA; 559 if (p_dev->config_regs & PRESENT_IOBASE_0) 560 option |= COR_ADDR_DECODE; 561 } 562 if ((flags & CONF_ENABLE_IRQ) && 563 !(flags & CONF_ENABLE_PULSE_IRQ)) 564 option |= COR_LEVEL_REQ; 565 pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &option); 566 msleep(40); 567 } 568 if (p_dev->config_regs & PRESENT_STATUS) 569 pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &status); 570 571 if (p_dev->config_regs & PRESENT_EXT_STATUS) 572 pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1, 573 &ext_status); 574 575 if (p_dev->config_regs & PRESENT_IOBASE_0) { 576 u8 b = c->io[0].start & 0xff; 577 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b); 578 b = (c->io[0].start >> 8) & 0xff; 579 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b); 580 } 581 if (p_dev->config_regs & PRESENT_IOSIZE) { 582 u8 b = resource_size(&c->io[0]) + resource_size(&c->io[1]) - 1; 583 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b); 584 } 585 586 /* Configure I/O windows */ 587 if (c->state & CONFIG_IO_REQ) { 588 iomap.speed = io_speed; 589 for (i = 0; i < MAX_IO_WIN; i++) 590 if (s->io[i].res) { 591 iomap.map = i; 592 iomap.flags = MAP_ACTIVE; 593 switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) { 594 case IO_DATA_PATH_WIDTH_16: 595 iomap.flags |= MAP_16BIT; break; 596 case IO_DATA_PATH_WIDTH_AUTO: 597 iomap.flags |= MAP_AUTOSZ; break; 598 default: 599 break; 600 } 601 iomap.start = s->io[i].res->start; 602 iomap.stop = s->io[i].res->end; 603 s->ops->set_io_map(s, &iomap); 604 s->io[i].Config++; 605 } 606 } 607 608 c->state |= CONFIG_LOCKED; 609 p_dev->_locked = 1; 610 mutex_unlock(&s->ops_mutex); 611 return 0; 612 } /* pcmcia_enable_device */ 613 EXPORT_SYMBOL(pcmcia_enable_device); 614 615 616 /** 617 * pcmcia_request_io() - attempt to reserve port ranges for PCMCIA devices 618 * @p_dev: the associated PCMCIA device 619 * 620 * pcmcia_request_io() attempts to reserve the IO port ranges specified in 621 * &struct pcmcia_device @p_dev->resource[0] and @p_dev->resource[1]. The 622 * "start" value is the requested start of the IO port resource; "end" 623 * reflects the number of ports requested. The number of IO lines requested 624 * is specified in &struct pcmcia_device @p_dev->io_lines. 625 */ 626 int pcmcia_request_io(struct pcmcia_device *p_dev) 627 { 628 struct pcmcia_socket *s = p_dev->socket; 629 config_t *c = p_dev->function_config; 630 int ret = -EINVAL; 631 632 mutex_lock(&s->ops_mutex); 633 dev_dbg(&p_dev->dev, "pcmcia_request_io: %pR , %pR", 634 &c->io[0], &c->io[1]); 635 636 if (!(s->state & SOCKET_PRESENT)) { 637 dev_dbg(&p_dev->dev, "pcmcia_request_io: No card present\n"); 638 goto out; 639 } 640 641 if (c->state & CONFIG_LOCKED) { 642 dev_dbg(&p_dev->dev, "Configuration is locked\n"); 643 goto out; 644 } 645 if (c->state & CONFIG_IO_REQ) { 646 dev_dbg(&p_dev->dev, "IO already configured\n"); 647 goto out; 648 } 649 650 ret = alloc_io_space(s, &c->io[0], p_dev->io_lines); 651 if (ret) 652 goto out; 653 654 if (c->io[1].end) { 655 ret = alloc_io_space(s, &c->io[1], p_dev->io_lines); 656 if (ret) { 657 struct resource tmp = c->io[0]; 658 /* release the previously allocated resource */ 659 release_io_space(s, &c->io[0]); 660 /* but preserve the settings, for they worked... */ 661 c->io[0].end = resource_size(&tmp); 662 c->io[0].start = tmp.start; 663 c->io[0].flags = tmp.flags; 664 goto out; 665 } 666 } else 667 c->io[1].start = 0; 668 669 c->state |= CONFIG_IO_REQ; 670 p_dev->_io = 1; 671 672 dev_dbg(&p_dev->dev, "pcmcia_request_io succeeded: %pR , %pR", 673 &c->io[0], &c->io[1]); 674 out: 675 mutex_unlock(&s->ops_mutex); 676 677 return ret; 678 } /* pcmcia_request_io */ 679 EXPORT_SYMBOL(pcmcia_request_io); 680 681 682 /** 683 * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device 684 * @p_dev: the associated PCMCIA device 685 * @handler: IRQ handler to register 686 * 687 * pcmcia_request_irq() is a wrapper around request_irq() which allows 688 * the PCMCIA core to clean up the registration in pcmcia_disable_device(). 689 * Drivers are free to use request_irq() directly, but then they need to 690 * call free_irq() themselfves, too. Also, only %IRQF_SHARED capable IRQ 691 * handlers are allowed. 692 */ 693 int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev, 694 irq_handler_t handler) 695 { 696 int ret; 697 698 if (!p_dev->irq) 699 return -EINVAL; 700 701 ret = request_irq(p_dev->irq, handler, IRQF_SHARED, 702 p_dev->devname, p_dev->priv); 703 if (!ret) 704 p_dev->_irq = 1; 705 706 return ret; 707 } 708 EXPORT_SYMBOL(pcmcia_request_irq); 709 710 711 #ifdef CONFIG_PCMCIA_PROBE 712 713 /* mask of IRQs already reserved by other cards, we should avoid using them */ 714 static u8 pcmcia_used_irq[32]; 715 716 static irqreturn_t test_action(int cpl, void *dev_id) 717 { 718 return IRQ_NONE; 719 } 720 721 /** 722 * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used 723 * @p_dev: the associated PCMCIA device 724 * @type: IRQ type (flags) 725 * 726 * locking note: must be called with ops_mutex locked. 727 */ 728 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type) 729 { 730 struct pcmcia_socket *s = p_dev->socket; 731 unsigned int try, irq; 732 u32 mask = s->irq_mask; 733 int ret = -ENODEV; 734 735 for (try = 0; try < 64; try++) { 736 irq = try % 32; 737 738 if (irq > NR_IRQS) 739 continue; 740 741 /* marked as available by driver, not blocked by userspace? */ 742 if (!((mask >> irq) & 1)) 743 continue; 744 745 /* avoid an IRQ which is already used by another PCMCIA card */ 746 if ((try < 32) && pcmcia_used_irq[irq]) 747 continue; 748 749 /* register the correct driver, if possible, to check whether 750 * registering a dummy handle works, i.e. if the IRQ isn't 751 * marked as used by the kernel resource management core */ 752 ret = request_irq(irq, test_action, type, p_dev->devname, 753 p_dev); 754 if (!ret) { 755 free_irq(irq, p_dev); 756 p_dev->irq = s->pcmcia_irq = irq; 757 pcmcia_used_irq[irq]++; 758 break; 759 } 760 } 761 762 return ret; 763 } 764 765 void pcmcia_cleanup_irq(struct pcmcia_socket *s) 766 { 767 pcmcia_used_irq[s->pcmcia_irq]--; 768 s->pcmcia_irq = 0; 769 } 770 771 #else /* CONFIG_PCMCIA_PROBE */ 772 773 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type) 774 { 775 return -EINVAL; 776 } 777 778 void pcmcia_cleanup_irq(struct pcmcia_socket *s) 779 { 780 s->pcmcia_irq = 0; 781 return; 782 } 783 784 #endif /* CONFIG_PCMCIA_PROBE */ 785 786 787 /** 788 * pcmcia_setup_irq() - determine IRQ to be used for device 789 * @p_dev: the associated PCMCIA device 790 * 791 * locking note: must be called with ops_mutex locked. 792 */ 793 int pcmcia_setup_irq(struct pcmcia_device *p_dev) 794 { 795 struct pcmcia_socket *s = p_dev->socket; 796 797 if (p_dev->irq) 798 return 0; 799 800 /* already assigned? */ 801 if (s->pcmcia_irq) { 802 p_dev->irq = s->pcmcia_irq; 803 return 0; 804 } 805 806 /* prefer an exclusive ISA irq */ 807 if (!pcmcia_setup_isa_irq(p_dev, 0)) 808 return 0; 809 810 /* but accept a shared ISA irq */ 811 if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED)) 812 return 0; 813 814 /* but use the PCI irq otherwise */ 815 if (s->pci_irq) { 816 p_dev->irq = s->pcmcia_irq = s->pci_irq; 817 return 0; 818 } 819 820 return -EINVAL; 821 } 822 823 824 /** 825 * pcmcia_request_window() - attempt to reserve iomem for PCMCIA devices 826 * @p_dev: the associated PCMCIA device 827 * @res: &struct resource pointing to p_dev->resource[2..5] 828 * @speed: access speed 829 * 830 * pcmcia_request_window() attepts to reserve an iomem ranges specified in 831 * &struct resource @res pointing to one of the entries in 832 * &struct pcmcia_device @p_dev->resource[2..5]. The "start" value is the 833 * requested start of the IO mem resource; "end" reflects the size 834 * requested. 835 */ 836 int pcmcia_request_window(struct pcmcia_device *p_dev, struct resource *res, 837 unsigned int speed) 838 { 839 struct pcmcia_socket *s = p_dev->socket; 840 pccard_mem_map *win; 841 u_long align; 842 int w; 843 844 dev_dbg(&p_dev->dev, "request_window %pR %d\n", res, speed); 845 846 if (!(s->state & SOCKET_PRESENT)) { 847 dev_dbg(&p_dev->dev, "No card present\n"); 848 return -ENODEV; 849 } 850 851 /* Window size defaults to smallest available */ 852 if (res->end == 0) 853 res->end = s->map_size; 854 align = (s->features & SS_CAP_MEM_ALIGN) ? res->end : s->map_size; 855 if (res->end & (s->map_size-1)) { 856 dev_dbg(&p_dev->dev, "invalid map size\n"); 857 return -EINVAL; 858 } 859 if ((res->start && (s->features & SS_CAP_STATIC_MAP)) || 860 (res->start & (align-1))) { 861 dev_dbg(&p_dev->dev, "invalid base address\n"); 862 return -EINVAL; 863 } 864 if (res->start) 865 align = 0; 866 867 /* Allocate system memory window */ 868 mutex_lock(&s->ops_mutex); 869 for (w = 0; w < MAX_WIN; w++) 870 if (!(s->state & SOCKET_WIN_REQ(w))) 871 break; 872 if (w == MAX_WIN) { 873 dev_dbg(&p_dev->dev, "all windows are used already\n"); 874 mutex_unlock(&s->ops_mutex); 875 return -EINVAL; 876 } 877 878 win = &s->win[w]; 879 880 if (!(s->features & SS_CAP_STATIC_MAP)) { 881 win->res = pcmcia_find_mem_region(res->start, res->end, align, 882 0, s); 883 if (!win->res) { 884 dev_dbg(&p_dev->dev, "allocating mem region failed\n"); 885 mutex_unlock(&s->ops_mutex); 886 return -EINVAL; 887 } 888 } 889 p_dev->_win |= CLIENT_WIN_REQ(w); 890 891 /* Configure the socket controller */ 892 win->map = w+1; 893 win->flags = res->flags & WIN_FLAGS_MAP; 894 win->speed = speed; 895 win->card_start = 0; 896 897 if (s->ops->set_mem_map(s, win) != 0) { 898 dev_dbg(&p_dev->dev, "failed to set memory mapping\n"); 899 mutex_unlock(&s->ops_mutex); 900 return -EIO; 901 } 902 s->state |= SOCKET_WIN_REQ(w); 903 904 /* Return window handle */ 905 if (s->features & SS_CAP_STATIC_MAP) 906 res->start = win->static_start; 907 else 908 res->start = win->res->start; 909 910 /* convert to new-style resources */ 911 res->end += res->start - 1; 912 res->flags &= ~WIN_FLAGS_REQ; 913 res->flags |= (win->map << 2) | IORESOURCE_MEM; 914 res->parent = win->res; 915 if (win->res) 916 request_resource(&iomem_resource, res); 917 918 dev_dbg(&p_dev->dev, "request_window results in %pR\n", res); 919 920 mutex_unlock(&s->ops_mutex); 921 922 return 0; 923 } /* pcmcia_request_window */ 924 EXPORT_SYMBOL(pcmcia_request_window); 925 926 927 /** 928 * pcmcia_disable_device() - disable and clean up a PCMCIA device 929 * @p_dev: the associated PCMCIA device 930 * 931 * pcmcia_disable_device() is the driver-callable counterpart to 932 * pcmcia_enable_device(): If a PCMCIA device is no longer used, 933 * drivers are expected to clean up and disable the device by calling 934 * this function. Any I/O ranges (iomem and ioports) will be released, 935 * the Vpp voltage will be set to 0, and IRQs will no longer be 936 * generated -- at least if there is no other card function (of 937 * multifunction devices) being used. 938 */ 939 void pcmcia_disable_device(struct pcmcia_device *p_dev) 940 { 941 int i; 942 943 dev_dbg(&p_dev->dev, "disabling device\n"); 944 945 for (i = 0; i < MAX_WIN; i++) { 946 struct resource *res = p_dev->resource[MAX_IO_WIN + i]; 947 if (res->flags & WIN_FLAGS_REQ) 948 pcmcia_release_window(p_dev, res); 949 } 950 951 pcmcia_release_configuration(p_dev); 952 pcmcia_release_io(p_dev); 953 if (p_dev->_irq) { 954 free_irq(p_dev->irq, p_dev->priv); 955 p_dev->_irq = 0; 956 } 957 } 958 EXPORT_SYMBOL(pcmcia_disable_device); 959