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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * PCMCIA 16-bit resource management functions4 *5 * The initial developer of the original code is David A. Hinds6 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds7 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.8 *9 * Copyright (C) 1999 David A. Hinds10 * Copyright (C) 2004-2010 Dominik Brodowski11 */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 */33static int io_speed;34module_param(io_speed, int, 0444);35 36 37int 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 45struct 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 socket57 * @res: resource to release58 *59 */60static 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 device90 * @s: pcmcia socket91 * @res: resource to allocate (begin: begin, end: size)92 * @lines: number of IO lines decoded by the PCMCIA card93 *94 * Special stuff for managing IO windows, because they are scarce95 */96static 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 } else115 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 registers149 *150 * pcmcia_access_config() reads and writes configuration registers in151 * attribute memory. Memory window 0 is reserved for this and the tuple152 * reading services. Drivers must use pcmcia_read_config_byte() or153 * pcmcia_write_config_byte().154 */155static 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 register189 *190 * pcmcia_read_config_byte() reads a byte from a configuration register in191 * attribute memory.192 */193int 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}197EXPORT_SYMBOL(pcmcia_read_config_byte);198 199 200/*201 * pcmcia_write_config_byte() - write a byte to a card configuration register202 *203 * pcmcia_write_config_byte() writes a byte to a configuration register in204 * attribute memory.205 */206int 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}210EXPORT_SYMBOL(pcmcia_write_config_byte);211 212 213/**214 * pcmcia_map_mem_page() - modify iomem window to point to a different offset215 * @p_dev: pcmcia device216 * @res: iomem resource already enabled by pcmcia_request_window()217 * @offset: card_offset to map218 *219 * pcmcia_map_mem_page() modifies what can be read and written by accessing220 * an iomem range previously enabled by pcmcia_request_window(), by setting221 * the card_offset value to @offset.222 */223int 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}242EXPORT_SYMBOL(pcmcia_map_mem_page);243 244 245/**246 * pcmcia_fixup_iowidth() - reduce io width to 8bit247 * @p_dev: pcmcia device248 *249 * pcmcia_fixup_iowidth() allows a PCMCIA device driver to reduce the250 * IO width to 8bit after having called pcmcia_enable_device()251 * previously.252 */253int 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 }286unlock:287 mutex_unlock(&s->ops_mutex);288 289 return ret;290}291EXPORT_SYMBOL(pcmcia_fixup_iowidth);292 293 294/**295 * pcmcia_fixup_vpp() - set Vpp to a new voltage level296 * @p_dev: pcmcia device297 * @new_vpp: new Vpp voltage298 *299 * pcmcia_fixup_vpp() allows a PCMCIA device driver to set Vpp to300 * a new voltage level between calls to pcmcia_enable_device()301 * and pcmcia_disable_device().302 */303int 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 327unlock:328 mutex_unlock(&s->ops_mutex);329 330 return ret;331}332EXPORT_SYMBOL(pcmcia_fixup_vpp);333 334 335/**336 * pcmcia_release_configuration() - physically disable a PCMCIA device337 * @p_dev: pcmcia device338 *339 * pcmcia_release_configuration() is the 1:1 counterpart to340 * pcmcia_enable_device(): If a PCMCIA device is no longer used by any341 * 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() and343 * pcmcia_release_window() still need to be called, device drivers are344 * expected to call pcmcia_disable_device() instead.345 */346int 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 device385 * @p_dev: pcmcia device386 *387 * pcmcia_release_io() releases the I/O ranges allocated by a PCMCIA388 * device. This may be invoked some time after a card ejection has389 * already dumped the actual socket configuration, so if the client is390 * "stale", we don't bother checking the port ranges against the391 * current socket values.392 */393static void pcmcia_release_io(struct pcmcia_device *p_dev)394{395 struct pcmcia_socket *s = p_dev->socket;396 config_t *c;397 398 mutex_lock(&s->ops_mutex);399 if (!p_dev->_io)400 goto out;401 402 c = p_dev->function_config;403 404 release_io_space(s, &c->io[0]);405 406 if (c->io[1].end)407 release_io_space(s, &c->io[1]);408 409 p_dev->_io = 0;410 c->state &= ~CONFIG_IO_REQ;411 412out:413 mutex_unlock(&s->ops_mutex);414} /* pcmcia_release_io */415 416 417/**418 * pcmcia_release_window() - release reserved iomem for PCMCIA devices419 * @p_dev: pcmcia device420 * @res: iomem resource to release421 *422 * pcmcia_release_window() releases &struct resource *res which was423 * previously reserved by calling pcmcia_request_window().424 */425int pcmcia_release_window(struct pcmcia_device *p_dev, struct resource *res)426{427 struct pcmcia_socket *s = p_dev->socket;428 pccard_mem_map *win;429 unsigned int w;430 431 dev_dbg(&p_dev->dev, "releasing window %pR\n", res);432 433 w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1;434 if (w >= MAX_WIN)435 return -EINVAL;436 437 mutex_lock(&s->ops_mutex);438 win = &s->win[w];439 440 if (!(p_dev->_win & CLIENT_WIN_REQ(w))) {441 dev_dbg(&p_dev->dev, "not releasing unknown window\n");442 mutex_unlock(&s->ops_mutex);443 return -EINVAL;444 }445 446 /* Shut down memory window */447 win->flags &= ~MAP_ACTIVE;448 s->ops->set_mem_map(s, win);449 s->state &= ~SOCKET_WIN_REQ(w);450 451 /* Release system memory */452 if (win->res) {453 release_resource(res);454 release_resource(win->res);455 kfree(win->res);456 win->res = NULL;457 }458 res->start = res->end = 0;459 res->flags = IORESOURCE_MEM;460 p_dev->_win &= ~CLIENT_WIN_REQ(w);461 mutex_unlock(&s->ops_mutex);462 463 return 0;464} /* pcmcia_release_window */465EXPORT_SYMBOL(pcmcia_release_window);466 467 468/**469 * pcmcia_enable_device() - set up and activate a PCMCIA device470 * @p_dev: the associated PCMCIA device471 *472 * pcmcia_enable_device() physically enables a PCMCIA device. It parses473 * the flags passed to in @flags and stored in @p_dev->flags and sets up474 * the Vpp voltage, enables the speaker line, I/O ports and store proper475 * values to configuration registers.476 */477int pcmcia_enable_device(struct pcmcia_device *p_dev)478{479 int i;480 unsigned int base;481 struct pcmcia_socket *s = p_dev->socket;482 config_t *c;483 pccard_io_map iomap;484 unsigned char status = 0;485 unsigned char ext_status = 0;486 unsigned char option = 0;487 unsigned int flags = p_dev->config_flags;488 489 if (!(s->state & SOCKET_PRESENT))490 return -ENODEV;491 492 mutex_lock(&s->ops_mutex);493 c = p_dev->function_config;494 if (c->state & CONFIG_LOCKED) {495 mutex_unlock(&s->ops_mutex);496 dev_dbg(&p_dev->dev, "Configuration is locked\n");497 return -EACCES;498 }499 500 /* Do power control. We don't allow changes in Vcc. */501 s->socket.Vpp = p_dev->vpp;502 if (s->ops->set_socket(s, &s->socket)) {503 mutex_unlock(&s->ops_mutex);504 dev_warn(&p_dev->dev, "Unable to set socket state\n");505 return -EINVAL;506 }507 508 /* Pick memory or I/O card, DMA mode, interrupt */509 if (p_dev->_io || flags & CONF_ENABLE_IRQ)510 flags |= CONF_ENABLE_IOCARD;511 if (flags & CONF_ENABLE_IOCARD)512 s->socket.flags |= SS_IOCARD;513 if (flags & CONF_ENABLE_ZVCARD)514 s->socket.flags |= SS_ZVCARD | SS_IOCARD;515 if (flags & CONF_ENABLE_SPKR) {516 s->socket.flags |= SS_SPKR_ENA;517 status = CCSR_AUDIO_ENA;518 if (!(p_dev->config_regs & PRESENT_STATUS))519 dev_warn(&p_dev->dev, "speaker requested, but "520 "PRESENT_STATUS not set!\n");521 }522 if (flags & CONF_ENABLE_IRQ)523 s->socket.io_irq = s->pcmcia_irq;524 else525 s->socket.io_irq = 0;526 if (flags & CONF_ENABLE_ESR) {527 p_dev->config_regs |= PRESENT_EXT_STATUS;528 ext_status = ESR_REQ_ATTN_ENA;529 }530 s->ops->set_socket(s, &s->socket);531 s->lock_count++;532 533 dev_dbg(&p_dev->dev,534 "enable_device: V %d, flags %x, base %x, regs %x, idx %x\n",535 p_dev->vpp, flags, p_dev->config_base, p_dev->config_regs,536 p_dev->config_index);537 538 /* Set up CIS configuration registers */539 base = p_dev->config_base;540 if (p_dev->config_regs & PRESENT_COPY) {541 u16 tmp = 0;542 dev_dbg(&p_dev->dev, "clearing CISREG_SCR\n");543 pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &tmp);544 }545 if (p_dev->config_regs & PRESENT_PIN_REPLACE) {546 u16 tmp = 0;547 dev_dbg(&p_dev->dev, "clearing CISREG_PRR\n");548 pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &tmp);549 }550 if (p_dev->config_regs & PRESENT_OPTION) {551 if (s->functions == 1) {552 option = p_dev->config_index & COR_CONFIG_MASK;553 } else {554 option = p_dev->config_index & COR_MFC_CONFIG_MASK;555 option |= COR_FUNC_ENA|COR_IREQ_ENA;556 if (p_dev->config_regs & PRESENT_IOBASE_0)557 option |= COR_ADDR_DECODE;558 }559 if ((flags & CONF_ENABLE_IRQ) &&560 !(flags & CONF_ENABLE_PULSE_IRQ))561 option |= COR_LEVEL_REQ;562 pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &option);563 msleep(40);564 }565 if (p_dev->config_regs & PRESENT_STATUS)566 pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &status);567 568 if (p_dev->config_regs & PRESENT_EXT_STATUS)569 pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1,570 &ext_status);571 572 if (p_dev->config_regs & PRESENT_IOBASE_0) {573 u8 b = c->io[0].start & 0xff;574 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b);575 b = (c->io[0].start >> 8) & 0xff;576 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b);577 }578 if (p_dev->config_regs & PRESENT_IOSIZE) {579 u8 b = resource_size(&c->io[0]) + resource_size(&c->io[1]) - 1;580 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b);581 }582 583 /* Configure I/O windows */584 if (c->state & CONFIG_IO_REQ) {585 iomap.speed = io_speed;586 for (i = 0; i < MAX_IO_WIN; i++)587 if (s->io[i].res) {588 iomap.map = i;589 iomap.flags = MAP_ACTIVE;590 switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) {591 case IO_DATA_PATH_WIDTH_16:592 iomap.flags |= MAP_16BIT; break;593 case IO_DATA_PATH_WIDTH_AUTO:594 iomap.flags |= MAP_AUTOSZ; break;595 default:596 break;597 }598 iomap.start = s->io[i].res->start;599 iomap.stop = s->io[i].res->end;600 s->ops->set_io_map(s, &iomap);601 s->io[i].Config++;602 }603 }604 605 c->state |= CONFIG_LOCKED;606 p_dev->_locked = 1;607 mutex_unlock(&s->ops_mutex);608 return 0;609} /* pcmcia_enable_device */610EXPORT_SYMBOL(pcmcia_enable_device);611 612 613/**614 * pcmcia_request_io() - attempt to reserve port ranges for PCMCIA devices615 * @p_dev: the associated PCMCIA device616 *617 * pcmcia_request_io() attempts to reserve the IO port ranges specified in618 * &struct pcmcia_device @p_dev->resource[0] and @p_dev->resource[1]. The619 * "start" value is the requested start of the IO port resource; "end"620 * reflects the number of ports requested. The number of IO lines requested621 * is specified in &struct pcmcia_device @p_dev->io_lines.622 */623int pcmcia_request_io(struct pcmcia_device *p_dev)624{625 struct pcmcia_socket *s = p_dev->socket;626 config_t *c = p_dev->function_config;627 int ret = -EINVAL;628 629 mutex_lock(&s->ops_mutex);630 dev_dbg(&p_dev->dev, "pcmcia_request_io: %pR , %pR",631 &c->io[0], &c->io[1]);632 633 if (!(s->state & SOCKET_PRESENT)) {634 dev_dbg(&p_dev->dev, "pcmcia_request_io: No card present\n");635 goto out;636 }637 638 if (c->state & CONFIG_LOCKED) {639 dev_dbg(&p_dev->dev, "Configuration is locked\n");640 goto out;641 }642 if (c->state & CONFIG_IO_REQ) {643 dev_dbg(&p_dev->dev, "IO already configured\n");644 goto out;645 }646 647 ret = alloc_io_space(s, &c->io[0], p_dev->io_lines);648 if (ret)649 goto out;650 651 if (c->io[1].end) {652 ret = alloc_io_space(s, &c->io[1], p_dev->io_lines);653 if (ret) {654 struct resource tmp = c->io[0];655 /* release the previously allocated resource */656 release_io_space(s, &c->io[0]);657 /* but preserve the settings, for they worked... */658 c->io[0].end = resource_size(&tmp);659 c->io[0].start = tmp.start;660 c->io[0].flags = tmp.flags;661 goto out;662 }663 } else664 c->io[1].start = 0;665 666 c->state |= CONFIG_IO_REQ;667 p_dev->_io = 1;668 669 dev_dbg(&p_dev->dev, "pcmcia_request_io succeeded: %pR , %pR",670 &c->io[0], &c->io[1]);671out:672 mutex_unlock(&s->ops_mutex);673 674 return ret;675} /* pcmcia_request_io */676EXPORT_SYMBOL(pcmcia_request_io);677 678 679/**680 * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device681 * @p_dev: the associated PCMCIA device682 * @handler: IRQ handler to register683 *684 * pcmcia_request_irq() is a wrapper around request_irq() which allows685 * the PCMCIA core to clean up the registration in pcmcia_disable_device().686 * Drivers are free to use request_irq() directly, but then they need to687 * call free_irq() themselves, too. Also, only %IRQF_SHARED capable IRQ688 * handlers are allowed.689 */690int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev,691 irq_handler_t handler)692{693 int ret;694 695 if (!p_dev->irq)696 return -EINVAL;697 698 ret = request_irq(p_dev->irq, handler, IRQF_SHARED,699 p_dev->devname, p_dev->priv);700 if (!ret)701 p_dev->_irq = 1;702 703 return ret;704}705EXPORT_SYMBOL(pcmcia_request_irq);706 707 708#ifdef CONFIG_PCMCIA_PROBE709 710/* mask of IRQs already reserved by other cards, we should avoid using them */711static u8 pcmcia_used_irq[32];712 713static irqreturn_t test_action(int cpl, void *dev_id)714{715 return IRQ_NONE;716}717 718/**719 * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used720 * @p_dev: the associated PCMCIA device721 * @type: IRQ type (flags)722 *723 * locking note: must be called with ops_mutex locked.724 */725static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)726{727 struct pcmcia_socket *s = p_dev->socket;728 unsigned int try, irq;729 u32 mask = s->irq_mask;730 int ret = -ENODEV;731 732 for (try = 0; try < 64; try++) {733 irq = try % 32;734 735 if (irq > NR_IRQS)736 continue;737 738 /* marked as available by driver, not blocked by userspace? */739 if (!((mask >> irq) & 1))740 continue;741 742 /* avoid an IRQ which is already used by another PCMCIA card */743 if ((try < 32) && pcmcia_used_irq[irq])744 continue;745 746 /* register the correct driver, if possible, to check whether747 * registering a dummy handle works, i.e. if the IRQ isn't748 * marked as used by the kernel resource management core */749 ret = request_irq(irq, test_action, type, p_dev->devname,750 p_dev);751 if (!ret) {752 free_irq(irq, p_dev);753 p_dev->irq = s->pcmcia_irq = irq;754 pcmcia_used_irq[irq]++;755 break;756 }757 }758 759 return ret;760}761 762void pcmcia_cleanup_irq(struct pcmcia_socket *s)763{764 pcmcia_used_irq[s->pcmcia_irq]--;765 s->pcmcia_irq = 0;766}767 768#else /* CONFIG_PCMCIA_PROBE */769 770static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)771{772 return -EINVAL;773}774 775void pcmcia_cleanup_irq(struct pcmcia_socket *s)776{777 s->pcmcia_irq = 0;778 return;779}780 781#endif /* CONFIG_PCMCIA_PROBE */782 783 784/**785 * pcmcia_setup_irq() - determine IRQ to be used for device786 * @p_dev: the associated PCMCIA device787 *788 * locking note: must be called with ops_mutex locked.789 */790int pcmcia_setup_irq(struct pcmcia_device *p_dev)791{792 struct pcmcia_socket *s = p_dev->socket;793 794 if (p_dev->irq)795 return 0;796 797 /* already assigned? */798 if (s->pcmcia_irq) {799 p_dev->irq = s->pcmcia_irq;800 return 0;801 }802 803 /* prefer an exclusive ISA irq */804 if (!pcmcia_setup_isa_irq(p_dev, 0))805 return 0;806 807 /* but accept a shared ISA irq */808 if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED))809 return 0;810 811 /* but use the PCI irq otherwise */812 if (s->pci_irq) {813 p_dev->irq = s->pcmcia_irq = s->pci_irq;814 return 0;815 }816 817 return -EINVAL;818}819 820 821/**822 * pcmcia_request_window() - attempt to reserve iomem for PCMCIA devices823 * @p_dev: the associated PCMCIA device824 * @res: &struct resource pointing to p_dev->resource[2..5]825 * @speed: access speed826 *827 * pcmcia_request_window() attepts to reserve an iomem ranges specified in828 * &struct resource @res pointing to one of the entries in829 * &struct pcmcia_device @p_dev->resource[2..5]. The "start" value is the830 * requested start of the IO mem resource; "end" reflects the size831 * requested.832 */833int pcmcia_request_window(struct pcmcia_device *p_dev, struct resource *res,834 unsigned int speed)835{836 struct pcmcia_socket *s = p_dev->socket;837 pccard_mem_map *win;838 u_long align;839 int w;840 841 dev_dbg(&p_dev->dev, "request_window %pR %d\n", res, speed);842 843 if (!(s->state & SOCKET_PRESENT)) {844 dev_dbg(&p_dev->dev, "No card present\n");845 return -ENODEV;846 }847 848 /* Window size defaults to smallest available */849 if (res->end == 0)850 res->end = s->map_size;851 align = (s->features & SS_CAP_MEM_ALIGN) ? res->end : s->map_size;852 if (res->end & (s->map_size-1)) {853 dev_dbg(&p_dev->dev, "invalid map size\n");854 return -EINVAL;855 }856 if ((res->start && (s->features & SS_CAP_STATIC_MAP)) ||857 (res->start & (align-1))) {858 dev_dbg(&p_dev->dev, "invalid base address\n");859 return -EINVAL;860 }861 if (res->start)862 align = 0;863 864 /* Allocate system memory window */865 mutex_lock(&s->ops_mutex);866 for (w = 0; w < MAX_WIN; w++)867 if (!(s->state & SOCKET_WIN_REQ(w)))868 break;869 if (w == MAX_WIN) {870 dev_dbg(&p_dev->dev, "all windows are used already\n");871 mutex_unlock(&s->ops_mutex);872 return -EINVAL;873 }874 875 win = &s->win[w];876 877 if (!(s->features & SS_CAP_STATIC_MAP)) {878 win->res = pcmcia_find_mem_region(res->start, res->end, align,879 0, s);880 if (!win->res) {881 dev_dbg(&p_dev->dev, "allocating mem region failed\n");882 mutex_unlock(&s->ops_mutex);883 return -EINVAL;884 }885 }886 p_dev->_win |= CLIENT_WIN_REQ(w);887 888 /* Configure the socket controller */889 win->map = w+1;890 win->flags = res->flags & WIN_FLAGS_MAP;891 win->speed = speed;892 win->card_start = 0;893 894 if (s->ops->set_mem_map(s, win) != 0) {895 dev_dbg(&p_dev->dev, "failed to set memory mapping\n");896 mutex_unlock(&s->ops_mutex);897 return -EIO;898 }899 s->state |= SOCKET_WIN_REQ(w);900 901 /* Return window handle */902 if (s->features & SS_CAP_STATIC_MAP)903 res->start = win->static_start;904 else905 res->start = win->res->start;906 907 /* convert to new-style resources */908 res->end += res->start - 1;909 res->flags &= ~WIN_FLAGS_REQ;910 res->flags |= (win->map << 2) | IORESOURCE_MEM;911 res->parent = win->res;912 if (win->res)913 request_resource(&iomem_resource, res);914 915 dev_dbg(&p_dev->dev, "request_window results in %pR\n", res);916 917 mutex_unlock(&s->ops_mutex);918 919 return 0;920} /* pcmcia_request_window */921EXPORT_SYMBOL(pcmcia_request_window);922 923 924/**925 * pcmcia_disable_device() - disable and clean up a PCMCIA device926 * @p_dev: the associated PCMCIA device927 *928 * pcmcia_disable_device() is the driver-callable counterpart to929 * pcmcia_enable_device(): If a PCMCIA device is no longer used,930 * drivers are expected to clean up and disable the device by calling931 * this function. Any I/O ranges (iomem and ioports) will be released,932 * the Vpp voltage will be set to 0, and IRQs will no longer be933 * generated -- at least if there is no other card function (of934 * multifunction devices) being used.935 */936void pcmcia_disable_device(struct pcmcia_device *p_dev)937{938 int i;939 940 dev_dbg(&p_dev->dev, "disabling device\n");941 942 for (i = 0; i < MAX_WIN; i++) {943 struct resource *res = p_dev->resource[MAX_IO_WIN + i];944 if (res->flags & WIN_FLAGS_REQ)945 pcmcia_release_window(p_dev, res);946 }947 948 pcmcia_release_configuration(p_dev);949 pcmcia_release_io(p_dev);950 if (p_dev->_irq) {951 free_irq(p_dev->irq, p_dev->priv);952 p_dev->_irq = 0;953 }954}955EXPORT_SYMBOL(pcmcia_disable_device);956