drivers/pnp/resource.c - kernel/msm-4.9 - Gitiles

 /*
  * resource.c - Contains functions for registering and analyzing resource information
  *
  * based on isapnp.c resource management (c) Jaroslav Kysela <perex@suse.cz>
  * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
  */

 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <asm/io.h>
 #include <asm/dma.h>
 #include <asm/irq.h>
 #include <linux/pci.h>
 #include <linux/ioport.h>
 #include <linux/init.h>

 #include <linux/pnp.h>
 #include "base.h"

 static int pnp_reserve_irq[16] = {[0 ... 15] = -1 };	/* reserve (don't use) some IRQ */
 static int pnp_reserve_dma[8] = {[0 ... 7] = -1 };	/* reserve (don't use) some DMA */
 static int pnp_reserve_io[16] = {[0 ... 15] = -1 };	/* reserve (don't use) some I/O region */
 static int pnp_reserve_mem[16] = {[0 ... 15] = -1 };	/* reserve (don't use) some memory region */

 /*
  * option registration
  */

 static struct pnp_option *pnp_build_option(int priority)
 {
 	struct pnp_option *option = pnp_alloc(sizeof(struct pnp_option));

 	if (!option)
 		return NULL;

 	option->priority = priority & 0xff;
 	/* make sure the priority is valid */
 	if (option->priority > PNP_RES_PRIORITY_FUNCTIONAL)
 		option->priority = PNP_RES_PRIORITY_INVALID;

 	return option;
 }

 struct pnp_option *pnp_register_independent_option(struct pnp_dev *dev)
 {
 	struct pnp_option *option;

 	option = pnp_build_option(PNP_RES_PRIORITY_PREFERRED);

 	/* this should never happen but if it does we'll try to continue */
 	if (dev->independent)
 		pnp_err("independent resource already registered");
 	dev->independent = option;
 	return option;
 }

 struct pnp_option *pnp_register_dependent_option(struct pnp_dev *dev,
 						 int priority)
 {
 	struct pnp_option *option;

 	option = pnp_build_option(priority);

 	if (dev->dependent) {
 		struct pnp_option *parent = dev->dependent;
 		while (parent->next)
 			parent = parent->next;
 		parent->next = option;
 	} else
 		dev->dependent = option;
 	return option;
 }

 int pnp_register_irq_resource(struct pnp_option *option, struct pnp_irq *data)
 {
 	struct pnp_irq *ptr;

 	ptr = option->irq;
 	while (ptr && ptr->next)
 		ptr = ptr->next;
 	if (ptr)
 		ptr->next = data;
 	else
 		option->irq = data;

 #ifdef CONFIG_PCI
 	{
 		int i;

 		for (i = 0; i < 16; i++)
 			if (test_bit(i, data->map))
 				pcibios_penalize_isa_irq(i, 0);
 	}
 #endif
 	return 0;
 }

 int pnp_register_dma_resource(struct pnp_option *option, struct pnp_dma *data)
 {
 	struct pnp_dma *ptr;

 	ptr = option->dma;
 	while (ptr && ptr->next)
 		ptr = ptr->next;
 	if (ptr)
 		ptr->next = data;
 	else
 		option->dma = data;

 	return 0;
 }

 int pnp_register_port_resource(struct pnp_option *option, struct pnp_port *data)
 {
 	struct pnp_port *ptr;

 	ptr = option->port;
 	while (ptr && ptr->next)
 		ptr = ptr->next;
 	if (ptr)
 		ptr->next = data;
 	else
 		option->port = data;

 	return 0;
 }

 int pnp_register_mem_resource(struct pnp_option *option, struct pnp_mem *data)
 {
 	struct pnp_mem *ptr;

 	ptr = option->mem;
 	while (ptr && ptr->next)
 		ptr = ptr->next;
 	if (ptr)
 		ptr->next = data;
 	else
 		option->mem = data;
 	return 0;
 }

 static void pnp_free_port(struct pnp_port *port)
 {
 	struct pnp_port *next;

 	while (port) {
 		next = port->next;
 		kfree(port);
 		port = next;
 	}
 }

 static void pnp_free_irq(struct pnp_irq *irq)
 {
 	struct pnp_irq *next;

 	while (irq) {
 		next = irq->next;
 		kfree(irq);
 		irq = next;
 	}
 }

 static void pnp_free_dma(struct pnp_dma *dma)
 {
 	struct pnp_dma *next;

 	while (dma) {
 		next = dma->next;
 		kfree(dma);
 		dma = next;
 	}
 }

 static void pnp_free_mem(struct pnp_mem *mem)
 {
 	struct pnp_mem *next;

 	while (mem) {
 		next = mem->next;
 		kfree(mem);
 		mem = next;
 	}
 }

 void pnp_free_option(struct pnp_option *option)
 {
 	struct pnp_option *next;

 	while (option) {
 		next = option->next;
 		pnp_free_port(option->port);
 		pnp_free_irq(option->irq);
 		pnp_free_dma(option->dma);
 		pnp_free_mem(option->mem);
 		kfree(option);
 		option = next;
 	}
 }

 /*
  * resource validity checking
  */

 #define length(start, end) (*(end) - *(start) + 1)

 /* Two ranges conflict if one doesn't end before the other starts */
 #define ranged_conflict(starta, enda, startb, endb) \
 	!((*(enda) < *(startb)) || (*(endb) < *(starta)))

 #define cannot_compare(flags) \
 ((flags) & (IORESOURCE_UNSET | IORESOURCE_DISABLED))

 int pnp_check_port(struct pnp_dev *dev, int idx)
 {
 	int tmp;
 	struct pnp_dev *tdev;
 	resource_size_t *port, *end, *tport, *tend;

 	port = &dev->res.port_resource[idx].start;
 	end = &dev->res.port_resource[idx].end;

 	/* if the resource doesn't exist, don't complain about it */
 	if (cannot_compare(dev->res.port_resource[idx].flags))
 		return 1;

 	/* check if the resource is already in use, skip if the
 	 * device is active because it itself may be in use */
 	if (!dev->active) {
 		if (__check_region(&ioport_resource, *port, length(port, end)))
 			return 0;
 	}

 	/* check if the resource is reserved */
 	for (tmp = 0; tmp < 8; tmp++) {
 		int rport = pnp_reserve_io[tmp << 1];
 		int rend = pnp_reserve_io[(tmp << 1) + 1] + rport - 1;
 		if (ranged_conflict(port, end, &rport, &rend))
 			return 0;
 	}

 	/* check for internal conflicts */
 	for (tmp = 0; tmp < PNP_MAX_PORT && tmp != idx; tmp++) {
 		if (dev->res.port_resource[tmp].flags & IORESOURCE_IO) {
 			tport = &dev->res.port_resource[tmp].start;
 			tend = &dev->res.port_resource[tmp].end;
 			if (ranged_conflict(port, end, tport, tend))
 				return 0;
 		}
 	}

 	/* check for conflicts with other pnp devices */
 	pnp_for_each_dev(tdev) {
 		if (tdev == dev)
 			continue;
 		for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) {
 			if (tdev->res.port_resource[tmp].flags & IORESOURCE_IO) {
 				if (cannot_compare
 				    (tdev->res.port_resource[tmp].flags))
 					continue;
 				tport = &tdev->res.port_resource[tmp].start;
 				tend = &tdev->res.port_resource[tmp].end;
 				if (ranged_conflict(port, end, tport, tend))
 					return 0;
 			}
 		}
 	}

 	return 1;
 }

 int pnp_check_mem(struct pnp_dev *dev, int idx)
 {
 	int tmp;
 	struct pnp_dev *tdev;
 	resource_size_t *addr, *end, *taddr, *tend;

 	addr = &dev->res.mem_resource[idx].start;
 	end = &dev->res.mem_resource[idx].end;

 	/* if the resource doesn't exist, don't complain about it */
 	if (cannot_compare(dev->res.mem_resource[idx].flags))
 		return 1;

 	/* check if the resource is already in use, skip if the
 	 * device is active because it itself may be in use */
 	if (!dev->active) {
 		if (check_mem_region(*addr, length(addr, end)))
 			return 0;
 	}

 	/* check if the resource is reserved */
 	for (tmp = 0; tmp < 8; tmp++) {
 		int raddr = pnp_reserve_mem[tmp << 1];
 		int rend = pnp_reserve_mem[(tmp << 1) + 1] + raddr - 1;
 		if (ranged_conflict(addr, end, &raddr, &rend))
 			return 0;
 	}

 	/* check for internal conflicts */
 	for (tmp = 0; tmp < PNP_MAX_MEM && tmp != idx; tmp++) {
 		if (dev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
 			taddr = &dev->res.mem_resource[tmp].start;
 			tend = &dev->res.mem_resource[tmp].end;
 			if (ranged_conflict(addr, end, taddr, tend))
 				return 0;
 		}
 	}

 	/* check for conflicts with other pnp devices */
 	pnp_for_each_dev(tdev) {
 		if (tdev == dev)
 			continue;
 		for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) {
 			if (tdev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
 				if (cannot_compare
 				    (tdev->res.mem_resource[tmp].flags))
 					continue;
 				taddr = &tdev->res.mem_resource[tmp].start;
 				tend = &tdev->res.mem_resource[tmp].end;
 				if (ranged_conflict(addr, end, taddr, tend))
 					return 0;
 			}
 		}
 	}

 	return 1;
 }

 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
 {
 	return IRQ_HANDLED;
 }

 int pnp_check_irq(struct pnp_dev *dev, int idx)
 {
 	int tmp;
 	struct pnp_dev *tdev;
 	resource_size_t *irq = &dev->res.irq_resource[idx].start;

 	/* if the resource doesn't exist, don't complain about it */
 	if (cannot_compare(dev->res.irq_resource[idx].flags))
 		return 1;

 	/* check if the resource is valid */
 	if (*irq < 0 || *irq > 15)
 		return 0;

 	/* check if the resource is reserved */
 	for (tmp = 0; tmp < 16; tmp++) {
 		if (pnp_reserve_irq[tmp] == *irq)
 			return 0;
 	}

 	/* check for internal conflicts */
 	for (tmp = 0; tmp < PNP_MAX_IRQ && tmp != idx; tmp++) {
 		if (dev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
 			if (dev->res.irq_resource[tmp].start == *irq)
 				return 0;
 		}
 	}

 #ifdef CONFIG_PCI
 	/* check if the resource is being used by a pci device */
 	{
 		struct pci_dev *pci = NULL;
 		for_each_pci_dev(pci) {
 			if (pci->irq == *irq)
 				return 0;
 		}
 	}
 #endif

 	/* check if the resource is already in use, skip if the
 	 * device is active because it itself may be in use */
 	if (!dev->active) {
 		if (request_irq(*irq, pnp_test_handler,
 				IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
 			return 0;
 		free_irq(*irq, NULL);
 	}

 	/* check for conflicts with other pnp devices */
 	pnp_for_each_dev(tdev) {
 		if (tdev == dev)
 			continue;
 		for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) {
 			if (tdev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
 				if (cannot_compare
 				    (tdev->res.irq_resource[tmp].flags))
 					continue;
 				if ((tdev->res.irq_resource[tmp].start == *irq))
 					return 0;
 			}
 		}
 	}

 	return 1;
 }

 int pnp_check_dma(struct pnp_dev *dev, int idx)
 {
 #ifndef CONFIG_IA64
 	int tmp;
 	struct pnp_dev *tdev;
 	resource_size_t *dma = &dev->res.dma_resource[idx].start;

 	/* if the resource doesn't exist, don't complain about it */
 	if (cannot_compare(dev->res.dma_resource[idx].flags))
 		return 1;

 	/* check if the resource is valid */
 	if (*dma < 0 || *dma == 4 || *dma > 7)
 		return 0;

 	/* check if the resource is reserved */
 	for (tmp = 0; tmp < 8; tmp++) {
 		if (pnp_reserve_dma[tmp] == *dma)
 			return 0;
 	}

 	/* check for internal conflicts */
 	for (tmp = 0; tmp < PNP_MAX_DMA && tmp != idx; tmp++) {
 		if (dev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
 			if (dev->res.dma_resource[tmp].start == *dma)
 				return 0;
 		}
 	}

 	/* check if the resource is already in use, skip if the
 	 * device is active because it itself may be in use */
 	if (!dev->active) {
 		if (request_dma(*dma, "pnp"))
 			return 0;
 		free_dma(*dma);
 	}

 	/* check for conflicts with other pnp devices */
 	pnp_for_each_dev(tdev) {
 		if (tdev == dev)
 			continue;
 		for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) {
 			if (tdev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
 				if (cannot_compare
 				    (tdev->res.dma_resource[tmp].flags))
 					continue;
 				if ((tdev->res.dma_resource[tmp].start == *dma))
 					return 0;
 			}
 		}
 	}

 	return 1;
 #else
 	/* IA64 does not have legacy DMA */
 	return 0;
 #endif
 }

 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 static int __init pnp_setup_reserve_irq(char *str)
 {
 	int i;

 	for (i = 0; i < 16; i++)
 		if (get_option(&str, &pnp_reserve_irq[i]) != 2)
 			break;
 	return 1;
 }

 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);

 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
 static int __init pnp_setup_reserve_dma(char *str)
 {
 	int i;

 	for (i = 0; i < 8; i++)
 		if (get_option(&str, &pnp_reserve_dma[i]) != 2)
 			break;
 	return 1;
 }

 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);

 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
 static int __init pnp_setup_reserve_io(char *str)
 {
 	int i;

 	for (i = 0; i < 16; i++)
 		if (get_option(&str, &pnp_reserve_io[i]) != 2)
 			break;
 	return 1;
 }

 __setup("pnp_reserve_io=", pnp_setup_reserve_io);

 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
 static int __init pnp_setup_reserve_mem(char *str)
 {
 	int i;

 	for (i = 0; i < 16; i++)
 		if (get_option(&str, &pnp_reserve_mem[i]) != 2)
 			break;
 	return 1;
 }

 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);
	/*
	* resource.c - Contains functions for registering and analyzing resource information
	*
	* based on isapnp.c resource management (c) Jaroslav Kysela <perex@suse.cz>
	* Copyright 2003 Adam Belay <ambx1@neo.rr.com>
	*/

	#include <linux/module.h>
	#include <linux/errno.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <asm/io.h>
	#include <asm/dma.h>
	#include <asm/irq.h>
	#include <linux/pci.h>
	#include <linux/ioport.h>
	#include <linux/init.h>

	#include <linux/pnp.h>
	#include "base.h"

	static int pnp_reserve_irq[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some IRQ */
	static int pnp_reserve_dma[8] = {[0 ... 7] = -1 }; /* reserve (don't use) some DMA */
	static int pnp_reserve_io[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some I/O region */
	static int pnp_reserve_mem[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some memory region */

	/*
	* option registration
	*/

	static struct pnp_option *pnp_build_option(int priority)
	{
	struct pnp_option *option = pnp_alloc(sizeof(struct pnp_option));

	if (!option)
	return NULL;

	option->priority = priority & 0xff;
	/* make sure the priority is valid */
	if (option->priority > PNP_RES_PRIORITY_FUNCTIONAL)
	option->priority = PNP_RES_PRIORITY_INVALID;

	return option;
	}

	struct pnp_option pnp_register_independent_option(struct pnp_dev dev)
	{
	struct pnp_option *option;

	option = pnp_build_option(PNP_RES_PRIORITY_PREFERRED);

	/* this should never happen but if it does we'll try to continue */
	if (dev->independent)
	pnp_err("independent resource already registered");
	dev->independent = option;
	return option;
	}

	struct pnp_option pnp_register_dependent_option(struct pnp_dev dev,
	int priority)
	{
	struct pnp_option *option;

	option = pnp_build_option(priority);

	if (dev->dependent) {
	struct pnp_option *parent = dev->dependent;
	while (parent->next)
	parent = parent->next;
	parent->next = option;
	} else
	dev->dependent = option;
	return option;
	}

	int pnp_register_irq_resource(struct pnp_option option, struct pnp_irq data)
	{
	struct pnp_irq *ptr;

	ptr = option->irq;
	while (ptr && ptr->next)
	ptr = ptr->next;
	if (ptr)
	ptr->next = data;
	else
	option->irq = data;

	#ifdef CONFIG_PCI
	{
	int i;

	for (i = 0; i < 16; i++)
	if (test_bit(i, data->map))
	pcibios_penalize_isa_irq(i, 0);
	}
	#endif
	return 0;
	}

	int pnp_register_dma_resource(struct pnp_option option, struct pnp_dma data)
	{
	struct pnp_dma *ptr;

	ptr = option->dma;
	while (ptr && ptr->next)
	ptr = ptr->next;
	if (ptr)
	ptr->next = data;
	else
	option->dma = data;

	return 0;
	}

	int pnp_register_port_resource(struct pnp_option option, struct pnp_port data)
	{
	struct pnp_port *ptr;

	ptr = option->port;
	while (ptr && ptr->next)
	ptr = ptr->next;
	if (ptr)
	ptr->next = data;
	else
	option->port = data;

	return 0;
	}

	int pnp_register_mem_resource(struct pnp_option option, struct pnp_mem data)
	{
	struct pnp_mem *ptr;

	ptr = option->mem;
	while (ptr && ptr->next)
	ptr = ptr->next;
	if (ptr)
	ptr->next = data;
	else
	option->mem = data;
	return 0;
	}

	static void pnp_free_port(struct pnp_port *port)
	{
	struct pnp_port *next;

	while (port) {
	next = port->next;
	kfree(port);
	port = next;
	}
	}

	static void pnp_free_irq(struct pnp_irq *irq)
	{
	struct pnp_irq *next;

	while (irq) {
	next = irq->next;
	kfree(irq);
	irq = next;
	}
	}

	static void pnp_free_dma(struct pnp_dma *dma)
	{
	struct pnp_dma *next;

	while (dma) {
	next = dma->next;
	kfree(dma);
	dma = next;
	}
	}

	static void pnp_free_mem(struct pnp_mem *mem)
	{
	struct pnp_mem *next;

	while (mem) {
	next = mem->next;
	kfree(mem);
	mem = next;
	}
	}

	void pnp_free_option(struct pnp_option *option)
	{
	struct pnp_option *next;

	while (option) {
	next = option->next;
	pnp_free_port(option->port);
	pnp_free_irq(option->irq);
	pnp_free_dma(option->dma);
	pnp_free_mem(option->mem);
	kfree(option);
	option = next;
	}
	}

	/*
	* resource validity checking
	*/

	#define length(start, end) ((end) - (start) + 1)

	/* Two ranges conflict if one doesn't end before the other starts */
	#define ranged_conflict(starta, enda, startb, endb) \
	!(((enda) < (startb)) \|\| ((endb) < (starta)))

	#define cannot_compare(flags) \
	((flags) & (IORESOURCE_UNSET \| IORESOURCE_DISABLED))

	int pnp_check_port(struct pnp_dev *dev, int idx)
	{
	int tmp;
	struct pnp_dev *tdev;
	resource_size_t port, end, tport, tend;

	port = &dev->res.port_resource[idx].start;
	end = &dev->res.port_resource[idx].end;

	/* if the resource doesn't exist, don't complain about it */
	if (cannot_compare(dev->res.port_resource[idx].flags))
	return 1;

	/* check if the resource is already in use, skip if the
	* device is active because it itself may be in use */
	if (!dev->active) {
	if (__check_region(&ioport_resource, *port, length(port, end)))
	return 0;
	}

	/* check if the resource is reserved */
	for (tmp = 0; tmp < 8; tmp++) {
	int rport = pnp_reserve_io[tmp << 1];
	int rend = pnp_reserve_io[(tmp << 1) + 1] + rport - 1;
	if (ranged_conflict(port, end, &rport, &rend))
	return 0;
	}

	/* check for internal conflicts */
	for (tmp = 0; tmp < PNP_MAX_PORT && tmp != idx; tmp++) {
	if (dev->res.port_resource[tmp].flags & IORESOURCE_IO) {
	tport = &dev->res.port_resource[tmp].start;
	tend = &dev->res.port_resource[tmp].end;
	if (ranged_conflict(port, end, tport, tend))
	return 0;
	}
	}

	/* check for conflicts with other pnp devices */
	pnp_for_each_dev(tdev) {
	if (tdev == dev)
	continue;
	for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) {
	if (tdev->res.port_resource[tmp].flags & IORESOURCE_IO) {
	if (cannot_compare
	(tdev->res.port_resource[tmp].flags))
	continue;
	tport = &tdev->res.port_resource[tmp].start;
	tend = &tdev->res.port_resource[tmp].end;
	if (ranged_conflict(port, end, tport, tend))
	return 0;
	}
	}
	}

	return 1;
	}

	int pnp_check_mem(struct pnp_dev *dev, int idx)
	{
	int tmp;
	struct pnp_dev *tdev;
	resource_size_t addr, end, taddr, tend;

	addr = &dev->res.mem_resource[idx].start;
	end = &dev->res.mem_resource[idx].end;

	/* if the resource doesn't exist, don't complain about it */
	if (cannot_compare(dev->res.mem_resource[idx].flags))
	return 1;

	/* check if the resource is already in use, skip if the
	* device is active because it itself may be in use */
	if (!dev->active) {
	if (check_mem_region(*addr, length(addr, end)))
	return 0;
	}

	/* check if the resource is reserved */
	for (tmp = 0; tmp < 8; tmp++) {
	int raddr = pnp_reserve_mem[tmp << 1];
	int rend = pnp_reserve_mem[(tmp << 1) + 1] + raddr - 1;
	if (ranged_conflict(addr, end, &raddr, &rend))
	return 0;
	}

	/* check for internal conflicts */
	for (tmp = 0; tmp < PNP_MAX_MEM && tmp != idx; tmp++) {
	if (dev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
	taddr = &dev->res.mem_resource[tmp].start;
	tend = &dev->res.mem_resource[tmp].end;
	if (ranged_conflict(addr, end, taddr, tend))
	return 0;
	}
	}

	/* check for conflicts with other pnp devices */
	pnp_for_each_dev(tdev) {
	if (tdev == dev)
	continue;
	for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) {
	if (tdev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
	if (cannot_compare
	(tdev->res.mem_resource[tmp].flags))
	continue;
	taddr = &tdev->res.mem_resource[tmp].start;
	tend = &tdev->res.mem_resource[tmp].end;
	if (ranged_conflict(addr, end, taddr, tend))
	return 0;
	}
	}
	}

	return 1;
	}

	static irqreturn_t pnp_test_handler(int irq, void *dev_id)
	{
	return IRQ_HANDLED;
	}

	int pnp_check_irq(struct pnp_dev *dev, int idx)
	{
	int tmp;
	struct pnp_dev *tdev;
	resource_size_t *irq = &dev->res.irq_resource[idx].start;

	/* if the resource doesn't exist, don't complain about it */
	if (cannot_compare(dev->res.irq_resource[idx].flags))
	return 1;

	/* check if the resource is valid */
	if (irq < 0 \|\| irq > 15)
	return 0;

	/* check if the resource is reserved */
	for (tmp = 0; tmp < 16; tmp++) {
	if (pnp_reserve_irq[tmp] == *irq)
	return 0;
	}

	/* check for internal conflicts */
	for (tmp = 0; tmp < PNP_MAX_IRQ && tmp != idx; tmp++) {
	if (dev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
	if (dev->res.irq_resource[tmp].start == *irq)
	return 0;
	}
	}

	#ifdef CONFIG_PCI
	/* check if the resource is being used by a pci device */
	{
	struct pci_dev *pci = NULL;
	for_each_pci_dev(pci) {
	if (pci->irq == *irq)
	return 0;
	}
	}
	#endif

	/* check if the resource is already in use, skip if the
	* device is active because it itself may be in use */
	if (!dev->active) {
	if (request_irq(*irq, pnp_test_handler,
	IRQF_DISABLED \| IRQF_PROBE_SHARED, "pnp", NULL))
	return 0;
	free_irq(*irq, NULL);
	}

	/* check for conflicts with other pnp devices */
	pnp_for_each_dev(tdev) {
	if (tdev == dev)
	continue;
	for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) {
	if (tdev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
	if (cannot_compare
	(tdev->res.irq_resource[tmp].flags))
	continue;
	if ((tdev->res.irq_resource[tmp].start == *irq))
	return 0;
	}
	}
	}

	return 1;
	}

	int pnp_check_dma(struct pnp_dev *dev, int idx)
	{
	#ifndef CONFIG_IA64
	int tmp;
	struct pnp_dev *tdev;
	resource_size_t *dma = &dev->res.dma_resource[idx].start;

	/* if the resource doesn't exist, don't complain about it */
	if (cannot_compare(dev->res.dma_resource[idx].flags))
	return 1;

	/* check if the resource is valid */
	if (dma < 0 \|\| dma == 4 \|\| *dma > 7)
	return 0;

	/* check if the resource is reserved */
	for (tmp = 0; tmp < 8; tmp++) {
	if (pnp_reserve_dma[tmp] == *dma)
	return 0;
	}

	/* check for internal conflicts */
	for (tmp = 0; tmp < PNP_MAX_DMA && tmp != idx; tmp++) {
	if (dev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
	if (dev->res.dma_resource[tmp].start == *dma)
	return 0;
	}
	}

	/* check if the resource is already in use, skip if the
	* device is active because it itself may be in use */
	if (!dev->active) {
	if (request_dma(*dma, "pnp"))
	return 0;
	free_dma(*dma);
	}

	/* check for conflicts with other pnp devices */
	pnp_for_each_dev(tdev) {
	if (tdev == dev)
	continue;
	for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) {
	if (tdev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
	if (cannot_compare
	(tdev->res.dma_resource[tmp].flags))
	continue;
	if ((tdev->res.dma_resource[tmp].start == *dma))
	return 0;
	}
	}
	}

	return 1;
	#else
	/* IA64 does not have legacy DMA */
	return 0;
	#endif
	}

	/* format is: pnp_reserve_irq=irq1[,irq2] .... */
	static int __init pnp_setup_reserve_irq(char *str)
	{
	int i;

	for (i = 0; i < 16; i++)
	if (get_option(&str, &pnp_reserve_irq[i]) != 2)
	break;
	return 1;
	}

	__setup("pnp_reserve_irq=", pnp_setup_reserve_irq);

	/* format is: pnp_reserve_dma=dma1[,dma2] .... */
	static int __init pnp_setup_reserve_dma(char *str)
	{
	int i;

	for (i = 0; i < 8; i++)
	if (get_option(&str, &pnp_reserve_dma[i]) != 2)
	break;
	return 1;
	}

	__setup("pnp_reserve_dma=", pnp_setup_reserve_dma);

	/* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
	static int __init pnp_setup_reserve_io(char *str)
	{
	int i;

	for (i = 0; i < 16; i++)
	if (get_option(&str, &pnp_reserve_io[i]) != 2)
	break;
	return 1;
	}

	__setup("pnp_reserve_io=", pnp_setup_reserve_io);

	/* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
	static int __init pnp_setup_reserve_mem(char *str)
	{
	int i;

	for (i = 0; i < 16; i++)
	if (get_option(&str, &pnp_reserve_mem[i]) != 2)
	break;
	return 1;
	}

	__setup("pnp_reserve_mem=", pnp_setup_reserve_mem);