Root/drivers/pnp/resource.c

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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