linux/drivers/pcmcia/pcmcia_resource.c
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   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
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