linux/drivers/pnp/resource.c
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   1/*
   2 * resource.c - Contains functions for registering and analyzing resource information
   3 *
   4 * based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
   5 * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
   6 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
   7 *      Bjorn Helgaas <bjorn.helgaas@hp.com>
   8 */
   9
  10#include <linux/module.h>
  11#include <linux/slab.h>
  12#include <linux/errno.h>
  13#include <linux/interrupt.h>
  14#include <linux/kernel.h>
  15#include <asm/io.h>
  16#include <asm/dma.h>
  17#include <asm/irq.h>
  18#include <linux/pci.h>
  19#include <linux/ioport.h>
  20#include <linux/init.h>
  21
  22#include <linux/pnp.h>
  23#include "base.h"
  24
  25static int pnp_reserve_irq[16] = {[0 ... 15] = -1 };    /* reserve (don't use) some IRQ */
  26static int pnp_reserve_dma[8] = {[0 ... 7] = -1 };      /* reserve (don't use) some DMA */
  27static int pnp_reserve_io[16] = {[0 ... 15] = -1 };     /* reserve (don't use) some I/O region */
  28static int pnp_reserve_mem[16] = {[0 ... 15] = -1 };    /* reserve (don't use) some memory region */
  29
  30/*
  31 * option registration
  32 */
  33
  34struct pnp_option *pnp_build_option(struct pnp_dev *dev, unsigned long type,
  35                                    unsigned int option_flags)
  36{
  37        struct pnp_option *option;
  38
  39        option = kzalloc(sizeof(struct pnp_option), GFP_KERNEL);
  40        if (!option)
  41                return NULL;
  42
  43        option->flags = option_flags;
  44        option->type = type;
  45
  46        list_add_tail(&option->list, &dev->options);
  47        return option;
  48}
  49
  50int pnp_register_irq_resource(struct pnp_dev *dev, unsigned int option_flags,
  51                              pnp_irq_mask_t *map, unsigned char flags)
  52{
  53        struct pnp_option *option;
  54        struct pnp_irq *irq;
  55
  56        option = pnp_build_option(dev, IORESOURCE_IRQ, option_flags);
  57        if (!option)
  58                return -ENOMEM;
  59
  60        irq = &option->u.irq;
  61        irq->map = *map;
  62        irq->flags = flags;
  63
  64#ifdef CONFIG_PCI
  65        {
  66                int i;
  67
  68                for (i = 0; i < 16; i++)
  69                        if (test_bit(i, irq->map.bits))
  70                                pcibios_penalize_isa_irq(i, 0);
  71        }
  72#endif
  73
  74        dbg_pnp_show_option(dev, option);
  75        return 0;
  76}
  77
  78int pnp_register_dma_resource(struct pnp_dev *dev, unsigned int option_flags,
  79                              unsigned char map, unsigned char flags)
  80{
  81        struct pnp_option *option;
  82        struct pnp_dma *dma;
  83
  84        option = pnp_build_option(dev, IORESOURCE_DMA, option_flags);
  85        if (!option)
  86                return -ENOMEM;
  87
  88        dma = &option->u.dma;
  89        dma->map = map;
  90        dma->flags = flags;
  91
  92        dbg_pnp_show_option(dev, option);
  93        return 0;
  94}
  95
  96int pnp_register_port_resource(struct pnp_dev *dev, unsigned int option_flags,
  97                               resource_size_t min, resource_size_t max,
  98                               resource_size_t align, resource_size_t size,
  99                               unsigned char flags)
 100{
 101        struct pnp_option *option;
 102        struct pnp_port *port;
 103
 104        option = pnp_build_option(dev, IORESOURCE_IO, option_flags);
 105        if (!option)
 106                return -ENOMEM;
 107
 108        port = &option->u.port;
 109        port->min = min;
 110        port->max = max;
 111        port->align = align;
 112        port->size = size;
 113        port->flags = flags;
 114
 115        dbg_pnp_show_option(dev, option);
 116        return 0;
 117}
 118
 119int pnp_register_mem_resource(struct pnp_dev *dev, unsigned int option_flags,
 120                              resource_size_t min, resource_size_t max,
 121                              resource_size_t align, resource_size_t size,
 122                              unsigned char flags)
 123{
 124        struct pnp_option *option;
 125        struct pnp_mem *mem;
 126
 127        option = pnp_build_option(dev, IORESOURCE_MEM, option_flags);
 128        if (!option)
 129                return -ENOMEM;
 130
 131        mem = &option->u.mem;
 132        mem->min = min;
 133        mem->max = max;
 134        mem->align = align;
 135        mem->size = size;
 136        mem->flags = flags;
 137
 138        dbg_pnp_show_option(dev, option);
 139        return 0;
 140}
 141
 142void pnp_free_options(struct pnp_dev *dev)
 143{
 144        struct pnp_option *option, *tmp;
 145
 146        list_for_each_entry_safe(option, tmp, &dev->options, list) {
 147                list_del(&option->list);
 148                kfree(option);
 149        }
 150}
 151
 152/*
 153 * resource validity checking
 154 */
 155
 156#define length(start, end) (*(end) - *(start) + 1)
 157
 158/* Two ranges conflict if one doesn't end before the other starts */
 159#define ranged_conflict(starta, enda, startb, endb) \
 160        !((*(enda) < *(startb)) || (*(endb) < *(starta)))
 161
 162#define cannot_compare(flags) \
 163((flags) & IORESOURCE_DISABLED)
 164
 165int pnp_check_port(struct pnp_dev *dev, struct resource *res)
 166{
 167        int i;
 168        struct pnp_dev *tdev;
 169        struct resource *tres;
 170        resource_size_t *port, *end, *tport, *tend;
 171
 172        port = &res->start;
 173        end = &res->end;
 174
 175        /* if the resource doesn't exist, don't complain about it */
 176        if (cannot_compare(res->flags))
 177                return 1;
 178
 179        /* check if the resource is already in use, skip if the
 180         * device is active because it itself may be in use */
 181        if (!dev->active) {
 182                if (__check_region(&ioport_resource, *port, length(port, end)))
 183                        return 0;
 184        }
 185
 186        /* check if the resource is reserved */
 187        for (i = 0; i < 8; i++) {
 188                int rport = pnp_reserve_io[i << 1];
 189                int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
 190                if (ranged_conflict(port, end, &rport, &rend))
 191                        return 0;
 192        }
 193
 194        /* check for internal conflicts */
 195        for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
 196                if (tres != res && tres->flags & IORESOURCE_IO) {
 197                        tport = &tres->start;
 198                        tend = &tres->end;
 199                        if (ranged_conflict(port, end, tport, tend))
 200                                return 0;
 201                }
 202        }
 203
 204        /* check for conflicts with other pnp devices */
 205        pnp_for_each_dev(tdev) {
 206                if (tdev == dev)
 207                        continue;
 208                for (i = 0;
 209                     (tres = pnp_get_resource(tdev, IORESOURCE_IO, i));
 210                     i++) {
 211                        if (tres->flags & IORESOURCE_IO) {
 212                                if (cannot_compare(tres->flags))
 213                                        continue;
 214                                if (tres->flags & IORESOURCE_WINDOW)
 215                                        continue;
 216                                tport = &tres->start;
 217                                tend = &tres->end;
 218                                if (ranged_conflict(port, end, tport, tend))
 219                                        return 0;
 220                        }
 221                }
 222        }
 223
 224        return 1;
 225}
 226
 227int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
 228{
 229        int i;
 230        struct pnp_dev *tdev;
 231        struct resource *tres;
 232        resource_size_t *addr, *end, *taddr, *tend;
 233
 234        addr = &res->start;
 235        end = &res->end;
 236
 237        /* if the resource doesn't exist, don't complain about it */
 238        if (cannot_compare(res->flags))
 239                return 1;
 240
 241        /* check if the resource is already in use, skip if the
 242         * device is active because it itself may be in use */
 243        if (!dev->active) {
 244                if (check_mem_region(*addr, length(addr, end)))
 245                        return 0;
 246        }
 247
 248        /* check if the resource is reserved */
 249        for (i = 0; i < 8; i++) {
 250                int raddr = pnp_reserve_mem[i << 1];
 251                int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
 252                if (ranged_conflict(addr, end, &raddr, &rend))
 253                        return 0;
 254        }
 255
 256        /* check for internal conflicts */
 257        for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
 258                if (tres != res && tres->flags & IORESOURCE_MEM) {
 259                        taddr = &tres->start;
 260                        tend = &tres->end;
 261                        if (ranged_conflict(addr, end, taddr, tend))
 262                                return 0;
 263                }
 264        }
 265
 266        /* check for conflicts with other pnp devices */
 267        pnp_for_each_dev(tdev) {
 268                if (tdev == dev)
 269                        continue;
 270                for (i = 0;
 271                     (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
 272                     i++) {
 273                        if (tres->flags & IORESOURCE_MEM) {
 274                                if (cannot_compare(tres->flags))
 275                                        continue;
 276                                if (tres->flags & IORESOURCE_WINDOW)
 277                                        continue;
 278                                taddr = &tres->start;
 279                                tend = &tres->end;
 280                                if (ranged_conflict(addr, end, taddr, tend))
 281                                        return 0;
 282                        }
 283                }
 284        }
 285
 286        return 1;
 287}
 288
 289static irqreturn_t pnp_test_handler(int irq, void *dev_id)
 290{
 291        return IRQ_HANDLED;
 292}
 293
 294#ifdef CONFIG_PCI
 295static int pci_dev_uses_irq(struct pnp_dev *pnp, struct pci_dev *pci,
 296                            unsigned int irq)
 297{
 298        u32 class;
 299        u8 progif;
 300
 301        if (pci->irq == irq) {
 302                pnp_dbg(&pnp->dev, "  device %s using irq %d\n",
 303                        pci_name(pci), irq);
 304                return 1;
 305        }
 306
 307        /*
 308         * See pci_setup_device() and ata_pci_sff_activate_host() for
 309         * similar IDE legacy detection.
 310         */
 311        pci_read_config_dword(pci, PCI_CLASS_REVISION, &class);
 312        class >>= 8;            /* discard revision ID */
 313        progif = class & 0xff;
 314        class >>= 8;
 315
 316        if (class == PCI_CLASS_STORAGE_IDE) {
 317                /*
 318                 * Unless both channels are native-PCI mode only,
 319                 * treat the compatibility IRQs as busy.
 320                 */
 321                if ((progif & 0x5) != 0x5)
 322                        if (pci_get_legacy_ide_irq(pci, 0) == irq ||
 323                            pci_get_legacy_ide_irq(pci, 1) == irq) {
 324                                pnp_dbg(&pnp->dev, "  legacy IDE device %s "
 325                                        "using irq %d\n", pci_name(pci), irq);
 326                                return 1;
 327                        }
 328        }
 329
 330        return 0;
 331}
 332#endif
 333
 334static int pci_uses_irq(struct pnp_dev *pnp, unsigned int irq)
 335{
 336#ifdef CONFIG_PCI
 337        struct pci_dev *pci = NULL;
 338
 339        for_each_pci_dev(pci) {
 340                if (pci_dev_uses_irq(pnp, pci, irq)) {
 341                        pci_dev_put(pci);
 342                        return 1;
 343                }
 344        }
 345#endif
 346        return 0;
 347}
 348
 349int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
 350{
 351        int i;
 352        struct pnp_dev *tdev;
 353        struct resource *tres;
 354        resource_size_t *irq;
 355
 356        irq = &res->start;
 357
 358        /* if the resource doesn't exist, don't complain about it */
 359        if (cannot_compare(res->flags))
 360                return 1;
 361
 362        /* check if the resource is valid */
 363        if (*irq < 0 || *irq > 15)
 364                return 0;
 365
 366        /* check if the resource is reserved */
 367        for (i = 0; i < 16; i++) {
 368                if (pnp_reserve_irq[i] == *irq)
 369                        return 0;
 370        }
 371
 372        /* check for internal conflicts */
 373        for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
 374                if (tres != res && tres->flags & IORESOURCE_IRQ) {
 375                        if (tres->start == *irq)
 376                                return 0;
 377                }
 378        }
 379
 380        /* check if the resource is being used by a pci device */
 381        if (pci_uses_irq(dev, *irq))
 382                return 0;
 383
 384        /* check if the resource is already in use, skip if the
 385         * device is active because it itself may be in use */
 386        if (!dev->active) {
 387                if (request_irq(*irq, pnp_test_handler,
 388                                IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
 389                        return 0;
 390                free_irq(*irq, NULL);
 391        }
 392
 393        /* check for conflicts with other pnp devices */
 394        pnp_for_each_dev(tdev) {
 395                if (tdev == dev)
 396                        continue;
 397                for (i = 0;
 398                     (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
 399                     i++) {
 400                        if (tres->flags & IORESOURCE_IRQ) {
 401                                if (cannot_compare(tres->flags))
 402                                        continue;
 403                                if (tres->start == *irq)
 404                                        return 0;
 405                        }
 406                }
 407        }
 408
 409        return 1;
 410}
 411
 412#ifdef CONFIG_ISA_DMA_API
 413int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
 414{
 415        int i;
 416        struct pnp_dev *tdev;
 417        struct resource *tres;
 418        resource_size_t *dma;
 419
 420        dma = &res->start;
 421
 422        /* if the resource doesn't exist, don't complain about it */
 423        if (cannot_compare(res->flags))
 424                return 1;
 425
 426        /* check if the resource is valid */
 427        if (*dma < 0 || *dma == 4 || *dma > 7)
 428                return 0;
 429
 430        /* check if the resource is reserved */
 431        for (i = 0; i < 8; i++) {
 432                if (pnp_reserve_dma[i] == *dma)
 433                        return 0;
 434        }
 435
 436        /* check for internal conflicts */
 437        for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
 438                if (tres != res && tres->flags & IORESOURCE_DMA) {
 439                        if (tres->start == *dma)
 440                                return 0;
 441                }
 442        }
 443
 444        /* check if the resource is already in use, skip if the
 445         * device is active because it itself may be in use */
 446        if (!dev->active) {
 447                if (request_dma(*dma, "pnp"))
 448                        return 0;
 449                free_dma(*dma);
 450        }
 451
 452        /* check for conflicts with other pnp devices */
 453        pnp_for_each_dev(tdev) {
 454                if (tdev == dev)
 455                        continue;
 456                for (i = 0;
 457                     (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
 458                     i++) {
 459                        if (tres->flags & IORESOURCE_DMA) {
 460                                if (cannot_compare(tres->flags))
 461                                        continue;
 462                                if (tres->start == *dma)
 463                                        return 0;
 464                        }
 465                }
 466        }
 467
 468        return 1;
 469}
 470#endif /* CONFIG_ISA_DMA_API */
 471
 472unsigned long pnp_resource_type(struct resource *res)
 473{
 474        return res->flags & (IORESOURCE_IO  | IORESOURCE_MEM |
 475                             IORESOURCE_IRQ | IORESOURCE_DMA |
 476                             IORESOURCE_BUS);
 477}
 478
 479struct resource *pnp_get_resource(struct pnp_dev *dev,
 480                                  unsigned long type, unsigned int num)
 481{
 482        struct pnp_resource *pnp_res;
 483        struct resource *res;
 484
 485        list_for_each_entry(pnp_res, &dev->resources, list) {
 486                res = &pnp_res->res;
 487                if (pnp_resource_type(res) == type && num-- == 0)
 488                        return res;
 489        }
 490        return NULL;
 491}
 492EXPORT_SYMBOL(pnp_get_resource);
 493
 494static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
 495{
 496        struct pnp_resource *pnp_res;
 497
 498        pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
 499        if (!pnp_res)
 500                return NULL;
 501
 502        list_add_tail(&pnp_res->list, &dev->resources);
 503        return pnp_res;
 504}
 505
 506struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
 507                                          int flags)
 508{
 509        struct pnp_resource *pnp_res;
 510        struct resource *res;
 511
 512        pnp_res = pnp_new_resource(dev);
 513        if (!pnp_res) {
 514                dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
 515                return NULL;
 516        }
 517
 518        res = &pnp_res->res;
 519        res->flags = IORESOURCE_IRQ | flags;
 520        res->start = irq;
 521        res->end = irq;
 522
 523        dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 524        return pnp_res;
 525}
 526
 527struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
 528                                          int flags)
 529{
 530        struct pnp_resource *pnp_res;
 531        struct resource *res;
 532
 533        pnp_res = pnp_new_resource(dev);
 534        if (!pnp_res) {
 535                dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
 536                return NULL;
 537        }
 538
 539        res = &pnp_res->res;
 540        res->flags = IORESOURCE_DMA | flags;
 541        res->start = dma;
 542        res->end = dma;
 543
 544        dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 545        return pnp_res;
 546}
 547
 548struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
 549                                         resource_size_t start,
 550                                         resource_size_t end, int flags)
 551{
 552        struct pnp_resource *pnp_res;
 553        struct resource *res;
 554
 555        pnp_res = pnp_new_resource(dev);
 556        if (!pnp_res) {
 557                dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
 558                        (unsigned long long) start,
 559                        (unsigned long long) end);
 560                return NULL;
 561        }
 562
 563        res = &pnp_res->res;
 564        res->flags = IORESOURCE_IO | flags;
 565        res->start = start;
 566        res->end = end;
 567
 568        dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 569        return pnp_res;
 570}
 571
 572struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
 573                                          resource_size_t start,
 574                                          resource_size_t end, int flags)
 575{
 576        struct pnp_resource *pnp_res;
 577        struct resource *res;
 578
 579        pnp_res = pnp_new_resource(dev);
 580        if (!pnp_res) {
 581                dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
 582                        (unsigned long long) start,
 583                        (unsigned long long) end);
 584                return NULL;
 585        }
 586
 587        res = &pnp_res->res;
 588        res->flags = IORESOURCE_MEM | flags;
 589        res->start = start;
 590        res->end = end;
 591
 592        dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 593        return pnp_res;
 594}
 595
 596struct pnp_resource *pnp_add_bus_resource(struct pnp_dev *dev,
 597                                          resource_size_t start,
 598                                          resource_size_t end)
 599{
 600        struct pnp_resource *pnp_res;
 601        struct resource *res;
 602
 603        pnp_res = pnp_new_resource(dev);
 604        if (!pnp_res) {
 605                dev_err(&dev->dev, "can't add resource for BUS %#llx-%#llx\n",
 606                        (unsigned long long) start,
 607                        (unsigned long long) end);
 608                return NULL;
 609        }
 610
 611        res = &pnp_res->res;
 612        res->flags = IORESOURCE_BUS;
 613        res->start = start;
 614        res->end = end;
 615
 616        dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 617        return pnp_res;
 618}
 619
 620/*
 621 * Determine whether the specified resource is a possible configuration
 622 * for this device.
 623 */
 624int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
 625                        resource_size_t size)
 626{
 627        struct pnp_option *option;
 628        struct pnp_port *port;
 629        struct pnp_mem *mem;
 630        struct pnp_irq *irq;
 631        struct pnp_dma *dma;
 632
 633        list_for_each_entry(option, &dev->options, list) {
 634                if (option->type != type)
 635                        continue;
 636
 637                switch (option->type) {
 638                case IORESOURCE_IO:
 639                        port = &option->u.port;
 640                        if (port->min == start && port->size == size)
 641                                return 1;
 642                        break;
 643                case IORESOURCE_MEM:
 644                        mem = &option->u.mem;
 645                        if (mem->min == start && mem->size == size)
 646                                return 1;
 647                        break;
 648                case IORESOURCE_IRQ:
 649                        irq = &option->u.irq;
 650                        if (start < PNP_IRQ_NR &&
 651                            test_bit(start, irq->map.bits))
 652                                return 1;
 653                        break;
 654                case IORESOURCE_DMA:
 655                        dma = &option->u.dma;
 656                        if (dma->map & (1 << start))
 657                                return 1;
 658                        break;
 659                }
 660        }
 661
 662        return 0;
 663}
 664EXPORT_SYMBOL(pnp_possible_config);
 665
 666int pnp_range_reserved(resource_size_t start, resource_size_t end)
 667{
 668        struct pnp_dev *dev;
 669        struct pnp_resource *pnp_res;
 670        resource_size_t *dev_start, *dev_end;
 671
 672        pnp_for_each_dev(dev) {
 673                list_for_each_entry(pnp_res, &dev->resources, list) {
 674                        dev_start = &pnp_res->res.start;
 675                        dev_end   = &pnp_res->res.end;
 676                        if (ranged_conflict(&start, &end, dev_start, dev_end))
 677                                return 1;
 678                }
 679        }
 680        return 0;
 681}
 682EXPORT_SYMBOL(pnp_range_reserved);
 683
 684/* format is: pnp_reserve_irq=irq1[,irq2] .... */
 685static int __init pnp_setup_reserve_irq(char *str)
 686{
 687        int i;
 688
 689        for (i = 0; i < 16; i++)
 690                if (get_option(&str, &pnp_reserve_irq[i]) != 2)
 691                        break;
 692        return 1;
 693}
 694
 695__setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
 696
 697/* format is: pnp_reserve_dma=dma1[,dma2] .... */
 698static int __init pnp_setup_reserve_dma(char *str)
 699{
 700        int i;
 701
 702        for (i = 0; i < 8; i++)
 703                if (get_option(&str, &pnp_reserve_dma[i]) != 2)
 704                        break;
 705        return 1;
 706}
 707
 708__setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
 709
 710/* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
 711static int __init pnp_setup_reserve_io(char *str)
 712{
 713        int i;
 714
 715        for (i = 0; i < 16; i++)
 716                if (get_option(&str, &pnp_reserve_io[i]) != 2)
 717                        break;
 718        return 1;
 719}
 720
 721__setup("pnp_reserve_io=", pnp_setup_reserve_io);
 722
 723/* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
 724static int __init pnp_setup_reserve_mem(char *str)
 725{
 726        int i;
 727
 728        for (i = 0; i < 16; i++)
 729                if (get_option(&str, &pnp_reserve_mem[i]) != 2)
 730                        break;
 731        return 1;
 732}
 733
 734__setup("pnp_reserve_mem=", pnp_setup_reserve_mem);
 735
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