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@perex.cz>
  * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
  * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
  *	Bjorn Helgaas <bjorn.helgaas@hp.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
  */

 struct pnp_option *pnp_build_option(struct pnp_dev *dev, unsigned long type,
 				    unsigned int option_flags)
 {
 	struct pnp_option *option;

 	option = kzalloc(sizeof(struct pnp_option), GFP_KERNEL);
 	if (!option)
 		return NULL;

 	option->flags = option_flags;
 	option->type = type;

 	list_add_tail(&option->list, &dev->options);
 	return option;
 }

 int pnp_register_irq_resource(struct pnp_dev *dev, unsigned int option_flags,
 			      pnp_irq_mask_t *map, unsigned char flags)
 {
 	struct pnp_option *option;
 	struct pnp_irq *irq;

 	option = pnp_build_option(dev, IORESOURCE_IRQ, option_flags);
 	if (!option)
 		return -ENOMEM;

 	irq = &option->u.irq;
 	irq->map = *map;
 	irq->flags = flags;

 #ifdef CONFIG_PCI
 	{
 		int i;

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

 	dbg_pnp_show_option(dev, option);
 	return 0;
 }

 int pnp_register_dma_resource(struct pnp_dev *dev, unsigned int option_flags,
 			      unsigned char map, unsigned char flags)
 {
 	struct pnp_option *option;
 	struct pnp_dma *dma;

 	option = pnp_build_option(dev, IORESOURCE_DMA, option_flags);
 	if (!option)
 		return -ENOMEM;

 	dma = &option->u.dma;
 	dma->map = map;
 	dma->flags = flags;

 	dbg_pnp_show_option(dev, option);
 	return 0;
 }

 int pnp_register_port_resource(struct pnp_dev *dev, unsigned int option_flags,
 			       resource_size_t min, resource_size_t max,
 			       resource_size_t align, resource_size_t size,
 			       unsigned char flags)
 {
 	struct pnp_option *option;
 	struct pnp_port *port;

 	option = pnp_build_option(dev, IORESOURCE_IO, option_flags);
 	if (!option)
 		return -ENOMEM;

 	port = &option->u.port;
 	port->min = min;
 	port->max = max;
 	port->align = align;
 	port->size = size;
 	port->flags = flags;

 	dbg_pnp_show_option(dev, option);
 	return 0;
 }

 int pnp_register_mem_resource(struct pnp_dev *dev, unsigned int option_flags,
 			      resource_size_t min, resource_size_t max,
 			      resource_size_t align, resource_size_t size,
 			      unsigned char flags)
 {
 	struct pnp_option *option;
 	struct pnp_mem *mem;

 	option = pnp_build_option(dev, IORESOURCE_MEM, option_flags);
 	if (!option)
 		return -ENOMEM;

 	mem = &option->u.mem;
 	mem->min = min;
 	mem->max = max;
 	mem->align = align;
 	mem->size = size;
 	mem->flags = flags;

 	dbg_pnp_show_option(dev, option);
 	return 0;
 }

 void pnp_free_options(struct pnp_dev *dev)
 {
 	struct pnp_option *option, *tmp;

 	list_for_each_entry_safe(option, tmp, &dev->options, list) {
 		list_del(&option->list);
 		kfree(option);
 	}
 }

 /*
  * 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_DISABLED)

 int pnp_check_port(struct pnp_dev *dev, struct resource *res)
 {
 	int i;
 	struct pnp_dev *tdev;
 	struct resource *tres;
 	resource_size_t *port, *end, *tport, *tend;

 	port = &res->start;
 	end = &res->end;

 	/* if the resource doesn't exist, don't complain about it */
 	if (cannot_compare(res->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 (i = 0; i < 8; i++) {
 		int rport = pnp_reserve_io[i << 1];
 		int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
 		if (ranged_conflict(port, end, &rport, &rend))
 			return 0;
 	}

 	/* check for internal conflicts */
 	for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
 		if (tres != res && tres->flags & IORESOURCE_IO) {
 			tport = &tres->start;
 			tend = &tres->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 (i = 0;
 		     (tres = pnp_get_resource(tdev, IORESOURCE_IO, i));
 		     i++) {
 			if (tres->flags & IORESOURCE_IO) {
 				if (cannot_compare(tres->flags))
 					continue;
 				tport = &tres->start;
 				tend = &tres->end;
 				if (ranged_conflict(port, end, tport, tend))
 					return 0;
 			}
 		}
 	}

 	return 1;
 }

 int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
 {
 	int i;
 	struct pnp_dev *tdev;
 	struct resource *tres;
 	resource_size_t *addr, *end, *taddr, *tend;

 	addr = &res->start;
 	end = &res->end;

 	/* if the resource doesn't exist, don't complain about it */
 	if (cannot_compare(res->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 (i = 0; i < 8; i++) {
 		int raddr = pnp_reserve_mem[i << 1];
 		int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
 		if (ranged_conflict(addr, end, &raddr, &rend))
 			return 0;
 	}

 	/* check for internal conflicts */
 	for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
 		if (tres != res && tres->flags & IORESOURCE_MEM) {
 			taddr = &tres->start;
 			tend = &tres->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 (i = 0;
 		     (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
 		     i++) {
 			if (tres->flags & IORESOURCE_MEM) {
 				if (cannot_compare(tres->flags))
 					continue;
 				taddr = &tres->start;
 				tend = &tres->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;
 }

 #ifdef CONFIG_PCI
 static int pci_dev_uses_irq(struct pnp_dev *pnp, struct pci_dev *pci,
 			    unsigned int irq)
 {
 	u32 class;
 	u8 progif;

 	if (pci->irq == irq) {
 		pnp_dbg(&pnp->dev, "  device %s using irq %d\n",
 			pci_name(pci), irq);
 		return 1;
 	}

 	/*
 	 * See pci_setup_device() and ata_pci_sff_activate_host() for
 	 * similar IDE legacy detection.
 	 */
 	pci_read_config_dword(pci, PCI_CLASS_REVISION, &class);
 	class >>= 8;		/* discard revision ID */
 	progif = class & 0xff;
 	class >>= 8;

 	if (class == PCI_CLASS_STORAGE_IDE) {
 		/*
 		 * Unless both channels are native-PCI mode only,
 		 * treat the compatibility IRQs as busy.
 		 */
 		if ((progif & 0x5) != 0x5)
 			if (pci_get_legacy_ide_irq(pci, 0) == irq ||
 			    pci_get_legacy_ide_irq(pci, 1) == irq) {
 				pnp_dbg(&pnp->dev, "  legacy IDE device %s "
 					"using irq %d\n", pci_name(pci), irq);
 				return 1;
 			}
 	}

 	return 0;
 }
 #endif

 static int pci_uses_irq(struct pnp_dev *pnp, unsigned int irq)
 {
 #ifdef CONFIG_PCI
 	struct pci_dev *pci = NULL;

 	for_each_pci_dev(pci) {
 		if (pci_dev_uses_irq(pnp, pci, irq)) {
 			pci_dev_put(pci);
 			return 1;
 		}
 	}
 #endif
 	return 0;
 }

 int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
 {
 	int i;
 	struct pnp_dev *tdev;
 	struct resource *tres;
 	resource_size_t *irq;

 	irq = &res->start;

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

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

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

 	/* check for internal conflicts */
 	for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
 		if (tres != res && tres->flags & IORESOURCE_IRQ) {
 			if (tres->start == *irq)
 				return 0;
 		}
 	}

 	/* check if the resource is being used by a pci device */
 	if (pci_uses_irq(dev, *irq))
 		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_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 (i = 0;
 		     (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
 		     i++) {
 			if (tres->flags & IORESOURCE_IRQ) {
 				if (cannot_compare(tres->flags))
 					continue;
 				if (tres->start == *irq)
 					return 0;
 			}
 		}
 	}

 	return 1;
 }

 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
 {
 #ifndef CONFIG_IA64
 	int i;
 	struct pnp_dev *tdev;
 	struct resource *tres;
 	resource_size_t *dma;

 	dma = &res->start;

 	/* if the resource doesn't exist, don't complain about it */
 	if (cannot_compare(res->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 (i = 0; i < 8; i++) {
 		if (pnp_reserve_dma[i] == *dma)
 			return 0;
 	}

 	/* check for internal conflicts */
 	for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
 		if (tres != res && tres->flags & IORESOURCE_DMA) {
 			if (tres->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 (i = 0;
 		     (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
 		     i++) {
 			if (tres->flags & IORESOURCE_DMA) {
 				if (cannot_compare(tres->flags))
 					continue;
 				if (tres->start == *dma)
 					return 0;
 			}
 		}
 	}

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

 unsigned long pnp_resource_type(struct resource *res)
 {
 	return res->flags & (IORESOURCE_IO  | IORESOURCE_MEM |
 			     IORESOURCE_IRQ | IORESOURCE_DMA);
 }

 struct resource *pnp_get_resource(struct pnp_dev *dev,
 				  unsigned long type, unsigned int num)
 {
 	struct pnp_resource *pnp_res;
 	struct resource *res;

 	list_for_each_entry(pnp_res, &dev->resources, list) {
 		res = &pnp_res->res;
 		if (pnp_resource_type(res) == type && num-- == 0)
 			return res;
 	}
 	return NULL;
 }
 EXPORT_SYMBOL(pnp_get_resource);

 static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
 {
 	struct pnp_resource *pnp_res;

 	pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
 	if (!pnp_res)
 		return NULL;

 	list_add_tail(&pnp_res->list, &dev->resources);
 	return pnp_res;
 }

 struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
 					  int flags)
 {
 	struct pnp_resource *pnp_res;
 	struct resource *res;

 	pnp_res = pnp_new_resource(dev);
 	if (!pnp_res) {
 		dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
 		return NULL;
 	}

 	res = &pnp_res->res;
 	res->flags = IORESOURCE_IRQ | flags;
 	res->start = irq;
 	res->end = irq;

 	pnp_dbg(&dev->dev, "  add %pRf\n", res);
 	return pnp_res;
 }

 struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
 					  int flags)
 {
 	struct pnp_resource *pnp_res;
 	struct resource *res;

 	pnp_res = pnp_new_resource(dev);
 	if (!pnp_res) {
 		dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
 		return NULL;
 	}

 	res = &pnp_res->res;
 	res->flags = IORESOURCE_DMA | flags;
 	res->start = dma;
 	res->end = dma;

 	pnp_dbg(&dev->dev, "  add %pRf\n", res);
 	return pnp_res;
 }

 struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
 					 resource_size_t start,
 					 resource_size_t end, int flags)
 {
 	struct pnp_resource *pnp_res;
 	struct resource *res;

 	pnp_res = pnp_new_resource(dev);
 	if (!pnp_res) {
 		dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
 			(unsigned long long) start,
 			(unsigned long long) end);
 		return NULL;
 	}

 	res = &pnp_res->res;
 	res->flags = IORESOURCE_IO | flags;
 	res->start = start;
 	res->end = end;

 	pnp_dbg(&dev->dev, "  add %pRf\n", res);
 	return pnp_res;
 }

 struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
 					  resource_size_t start,
 					  resource_size_t end, int flags)
 {
 	struct pnp_resource *pnp_res;
 	struct resource *res;

 	pnp_res = pnp_new_resource(dev);
 	if (!pnp_res) {
 		dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
 			(unsigned long long) start,
 			(unsigned long long) end);
 		return NULL;
 	}

 	res = &pnp_res->res;
 	res->flags = IORESOURCE_MEM | flags;
 	res->start = start;
 	res->end = end;

 	pnp_dbg(&dev->dev, "  add %pRf\n", res);
 	return pnp_res;
 }

 /*
  * Determine whether the specified resource is a possible configuration
  * for this device.
  */
 int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
 			resource_size_t size)
 {
 	struct pnp_option *option;
 	struct pnp_port *port;
 	struct pnp_mem *mem;
 	struct pnp_irq *irq;
 	struct pnp_dma *dma;

 	list_for_each_entry(option, &dev->options, list) {
 		if (option->type != type)
 			continue;

 		switch (option->type) {
 		case IORESOURCE_IO:
 			port = &option->u.port;
 			if (port->min == start && port->size == size)
 				return 1;
 			break;
 		case IORESOURCE_MEM:
 			mem = &option->u.mem;
 			if (mem->min == start && mem->size == size)
 				return 1;
 			break;
 		case IORESOURCE_IRQ:
 			irq = &option->u.irq;
 			if (start < PNP_IRQ_NR &&
 			    test_bit(start, irq->map.bits))
 				return 1;
 			break;
 		case IORESOURCE_DMA:
 			dma = &option->u.dma;
 			if (dma->map & (1 << start))
 				return 1;
 			break;
 		}
 	}

 	return 0;
 }
 EXPORT_SYMBOL(pnp_possible_config);

 int pnp_range_reserved(resource_size_t start, resource_size_t end)
 {
 	struct pnp_dev *dev;
 	struct pnp_resource *pnp_res;
 	resource_size_t *dev_start, *dev_end;

 	pnp_for_each_dev(dev) {
 		list_for_each_entry(pnp_res, &dev->resources, list) {
 			dev_start = &pnp_res->res.start;
 			dev_end   = &pnp_res->res.end;
 			if (ranged_conflict(&start, &end, dev_start, dev_end))
 				return 1;
 		}
 	}
 	return 0;
 }
 EXPORT_SYMBOL(pnp_range_reserved);

 /* 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@perex.cz>
	* Copyright 2003 Adam Belay <ambx1@neo.rr.com>
	* Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
	* Bjorn Helgaas <bjorn.helgaas@hp.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
	*/

	struct pnp_option pnp_build_option(struct pnp_dev dev, unsigned long type,
	unsigned int option_flags)
	{
	struct pnp_option *option;

	option = kzalloc(sizeof(struct pnp_option), GFP_KERNEL);
	if (!option)
	return NULL;

	option->flags = option_flags;
	option->type = type;

	list_add_tail(&option->list, &dev->options);
	return option;
	}

	int pnp_register_irq_resource(struct pnp_dev *dev, unsigned int option_flags,
	pnp_irq_mask_t *map, unsigned char flags)
	{
	struct pnp_option *option;
	struct pnp_irq *irq;

	option = pnp_build_option(dev, IORESOURCE_IRQ, option_flags);
	if (!option)
	return -ENOMEM;

	irq = &option->u.irq;
	irq->map = *map;
	irq->flags = flags;

	#ifdef CONFIG_PCI
	{
	int i;

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

	dbg_pnp_show_option(dev, option);
	return 0;
	}

	int pnp_register_dma_resource(struct pnp_dev *dev, unsigned int option_flags,
	unsigned char map, unsigned char flags)
	{
	struct pnp_option *option;
	struct pnp_dma *dma;

	option = pnp_build_option(dev, IORESOURCE_DMA, option_flags);
	if (!option)
	return -ENOMEM;

	dma = &option->u.dma;
	dma->map = map;
	dma->flags = flags;

	dbg_pnp_show_option(dev, option);
	return 0;
	}

	int pnp_register_port_resource(struct pnp_dev *dev, unsigned int option_flags,
	resource_size_t min, resource_size_t max,
	resource_size_t align, resource_size_t size,
	unsigned char flags)
	{
	struct pnp_option *option;
	struct pnp_port *port;

	option = pnp_build_option(dev, IORESOURCE_IO, option_flags);
	if (!option)
	return -ENOMEM;

	port = &option->u.port;
	port->min = min;
	port->max = max;
	port->align = align;
	port->size = size;
	port->flags = flags;

	dbg_pnp_show_option(dev, option);
	return 0;
	}

	int pnp_register_mem_resource(struct pnp_dev *dev, unsigned int option_flags,
	resource_size_t min, resource_size_t max,
	resource_size_t align, resource_size_t size,
	unsigned char flags)
	{
	struct pnp_option *option;
	struct pnp_mem *mem;

	option = pnp_build_option(dev, IORESOURCE_MEM, option_flags);
	if (!option)
	return -ENOMEM;

	mem = &option->u.mem;
	mem->min = min;
	mem->max = max;
	mem->align = align;
	mem->size = size;
	mem->flags = flags;

	dbg_pnp_show_option(dev, option);
	return 0;
	}

	void pnp_free_options(struct pnp_dev *dev)
	{
	struct pnp_option option, tmp;

	list_for_each_entry_safe(option, tmp, &dev->options, list) {
	list_del(&option->list);
	kfree(option);
	}
	}

	/*
	* 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_DISABLED)

	int pnp_check_port(struct pnp_dev dev, struct resource res)
	{
	int i;
	struct pnp_dev *tdev;
	struct resource *tres;
	resource_size_t port, end, tport, tend;

	port = &res->start;
	end = &res->end;

	/* if the resource doesn't exist, don't complain about it */
	if (cannot_compare(res->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 (i = 0; i < 8; i++) {
	int rport = pnp_reserve_io[i << 1];
	int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
	if (ranged_conflict(port, end, &rport, &rend))
	return 0;
	}

	/* check for internal conflicts */
	for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
	if (tres != res && tres->flags & IORESOURCE_IO) {
	tport = &tres->start;
	tend = &tres->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 (i = 0;
	(tres = pnp_get_resource(tdev, IORESOURCE_IO, i));
	i++) {
	if (tres->flags & IORESOURCE_IO) {
	if (cannot_compare(tres->flags))
	continue;
	tport = &tres->start;
	tend = &tres->end;
	if (ranged_conflict(port, end, tport, tend))
	return 0;
	}
	}
	}

	return 1;
	}

	int pnp_check_mem(struct pnp_dev dev, struct resource res)
	{
	int i;
	struct pnp_dev *tdev;
	struct resource *tres;
	resource_size_t addr, end, taddr, tend;

	addr = &res->start;
	end = &res->end;

	/* if the resource doesn't exist, don't complain about it */
	if (cannot_compare(res->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 (i = 0; i < 8; i++) {
	int raddr = pnp_reserve_mem[i << 1];
	int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
	if (ranged_conflict(addr, end, &raddr, &rend))
	return 0;
	}

	/* check for internal conflicts */
	for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
	if (tres != res && tres->flags & IORESOURCE_MEM) {
	taddr = &tres->start;
	tend = &tres->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 (i = 0;
	(tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
	i++) {
	if (tres->flags & IORESOURCE_MEM) {
	if (cannot_compare(tres->flags))
	continue;
	taddr = &tres->start;
	tend = &tres->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;
	}

	#ifdef CONFIG_PCI
	static int pci_dev_uses_irq(struct pnp_dev pnp, struct pci_dev pci,
	unsigned int irq)
	{
	u32 class;
	u8 progif;

	if (pci->irq == irq) {
	pnp_dbg(&pnp->dev, " device %s using irq %d\n",
	pci_name(pci), irq);
	return 1;
	}

	/*
	* See pci_setup_device() and ata_pci_sff_activate_host() for
	* similar IDE legacy detection.
	*/
	pci_read_config_dword(pci, PCI_CLASS_REVISION, &class);
	class >>= 8; /* discard revision ID */
	progif = class & 0xff;
	class >>= 8;

	if (class == PCI_CLASS_STORAGE_IDE) {
	/*
	* Unless both channels are native-PCI mode only,
	* treat the compatibility IRQs as busy.
	*/
	if ((progif & 0x5) != 0x5)
	if (pci_get_legacy_ide_irq(pci, 0) == irq \|\|
	pci_get_legacy_ide_irq(pci, 1) == irq) {
	pnp_dbg(&pnp->dev, " legacy IDE device %s "
	"using irq %d\n", pci_name(pci), irq);
	return 1;
	}
	}

	return 0;
	}
	#endif

	static int pci_uses_irq(struct pnp_dev *pnp, unsigned int irq)
	{
	#ifdef CONFIG_PCI
	struct pci_dev *pci = NULL;

	for_each_pci_dev(pci) {
	if (pci_dev_uses_irq(pnp, pci, irq)) {
	pci_dev_put(pci);
	return 1;
	}
	}
	#endif
	return 0;
	}

	int pnp_check_irq(struct pnp_dev dev, struct resource res)
	{
	int i;
	struct pnp_dev *tdev;
	struct resource *tres;
	resource_size_t *irq;

	irq = &res->start;

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

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

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

	/* check for internal conflicts */
	for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
	if (tres != res && tres->flags & IORESOURCE_IRQ) {
	if (tres->start == *irq)
	return 0;
	}
	}

	/* check if the resource is being used by a pci device */
	if (pci_uses_irq(dev, *irq))
	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_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 (i = 0;
	(tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
	i++) {
	if (tres->flags & IORESOURCE_IRQ) {
	if (cannot_compare(tres->flags))
	continue;
	if (tres->start == *irq)
	return 0;
	}
	}
	}

	return 1;
	}

	int pnp_check_dma(struct pnp_dev dev, struct resource res)
	{
	#ifndef CONFIG_IA64
	int i;
	struct pnp_dev *tdev;
	struct resource *tres;
	resource_size_t *dma;

	dma = &res->start;

	/* if the resource doesn't exist, don't complain about it */
	if (cannot_compare(res->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 (i = 0; i < 8; i++) {
	if (pnp_reserve_dma[i] == *dma)
	return 0;
	}

	/* check for internal conflicts */
	for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
	if (tres != res && tres->flags & IORESOURCE_DMA) {
	if (tres->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 (i = 0;
	(tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
	i++) {
	if (tres->flags & IORESOURCE_DMA) {
	if (cannot_compare(tres->flags))
	continue;
	if (tres->start == *dma)
	return 0;
	}
	}
	}

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

	unsigned long pnp_resource_type(struct resource *res)
	{
	return res->flags & (IORESOURCE_IO \| IORESOURCE_MEM \|
	IORESOURCE_IRQ \| IORESOURCE_DMA);
	}

	struct resource pnp_get_resource(struct pnp_dev dev,
	unsigned long type, unsigned int num)
	{
	struct pnp_resource *pnp_res;
	struct resource *res;

	list_for_each_entry(pnp_res, &dev->resources, list) {
	res = &pnp_res->res;
	if (pnp_resource_type(res) == type && num-- == 0)
	return res;
	}
	return NULL;
	}
	EXPORT_SYMBOL(pnp_get_resource);

	static struct pnp_resource pnp_new_resource(struct pnp_dev dev)
	{
	struct pnp_resource *pnp_res;

	pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
	if (!pnp_res)
	return NULL;

	list_add_tail(&pnp_res->list, &dev->resources);
	return pnp_res;
	}

	struct pnp_resource pnp_add_irq_resource(struct pnp_dev dev, int irq,
	int flags)
	{
	struct pnp_resource *pnp_res;
	struct resource *res;

	pnp_res = pnp_new_resource(dev);
	if (!pnp_res) {
	dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
	return NULL;
	}

	res = &pnp_res->res;
	res->flags = IORESOURCE_IRQ \| flags;
	res->start = irq;
	res->end = irq;

	pnp_dbg(&dev->dev, " add %pRf\n", res);
	return pnp_res;
	}

	struct pnp_resource pnp_add_dma_resource(struct pnp_dev dev, int dma,
	int flags)
	{
	struct pnp_resource *pnp_res;
	struct resource *res;

	pnp_res = pnp_new_resource(dev);
	if (!pnp_res) {
	dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
	return NULL;
	}

	res = &pnp_res->res;
	res->flags = IORESOURCE_DMA \| flags;
	res->start = dma;
	res->end = dma;

	pnp_dbg(&dev->dev, " add %pRf\n", res);
	return pnp_res;
	}

	struct pnp_resource pnp_add_io_resource(struct pnp_dev dev,
	resource_size_t start,
	resource_size_t end, int flags)
	{
	struct pnp_resource *pnp_res;
	struct resource *res;

	pnp_res = pnp_new_resource(dev);
	if (!pnp_res) {
	dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
	(unsigned long long) start,
	(unsigned long long) end);
	return NULL;
	}

	res = &pnp_res->res;
	res->flags = IORESOURCE_IO \| flags;
	res->start = start;
	res->end = end;

	pnp_dbg(&dev->dev, " add %pRf\n", res);
	return pnp_res;
	}

	struct pnp_resource pnp_add_mem_resource(struct pnp_dev dev,
	resource_size_t start,
	resource_size_t end, int flags)
	{
	struct pnp_resource *pnp_res;
	struct resource *res;

	pnp_res = pnp_new_resource(dev);
	if (!pnp_res) {
	dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
	(unsigned long long) start,
	(unsigned long long) end);
	return NULL;
	}

	res = &pnp_res->res;
	res->flags = IORESOURCE_MEM \| flags;
	res->start = start;
	res->end = end;

	pnp_dbg(&dev->dev, " add %pRf\n", res);
	return pnp_res;
	}

	/*
	* Determine whether the specified resource is a possible configuration
	* for this device.
	*/
	int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
	resource_size_t size)
	{
	struct pnp_option *option;
	struct pnp_port *port;
	struct pnp_mem *mem;
	struct pnp_irq *irq;
	struct pnp_dma *dma;

	list_for_each_entry(option, &dev->options, list) {
	if (option->type != type)
	continue;

	switch (option->type) {
	case IORESOURCE_IO:
	port = &option->u.port;
	if (port->min == start && port->size == size)
	return 1;
	break;
	case IORESOURCE_MEM:
	mem = &option->u.mem;
	if (mem->min == start && mem->size == size)
	return 1;
	break;
	case IORESOURCE_IRQ:
	irq = &option->u.irq;
	if (start < PNP_IRQ_NR &&
	test_bit(start, irq->map.bits))
	return 1;
	break;
	case IORESOURCE_DMA:
	dma = &option->u.dma;
	if (dma->map & (1 << start))
	return 1;
	break;
	}
	}

	return 0;
	}
	EXPORT_SYMBOL(pnp_possible_config);

	int pnp_range_reserved(resource_size_t start, resource_size_t end)
	{
	struct pnp_dev *dev;
	struct pnp_resource *pnp_res;
	resource_size_t dev_start, dev_end;

	pnp_for_each_dev(dev) {
	list_for_each_entry(pnp_res, &dev->resources, list) {
	dev_start = &pnp_res->res.start;
	dev_end = &pnp_res->res.end;
	if (ranged_conflict(&start, &end, dev_start, dev_end))
	return 1;
	}
	}
	return 0;
	}
	EXPORT_SYMBOL(pnp_range_reserved);

	/* 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);