[deliverable/linux.git] / drivers / pnp / manager.c

/*
 * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
 *
 * based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
 * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
 */

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include <linux/bitmap.h>
#include <linux/mutex.h>
#include "base.h"

DEFINE_MUTEX(pnp_res_mutex);

static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
{
	resource_size_t *start, *end;
	unsigned long *flags;

	if (idx >= PNP_MAX_PORT) {
		dev_err(&dev->dev, "too many I/O port resources\n");
		/* pretend we were successful so at least the manager won't try again */
		return 1;
	}

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

	/* check if this resource has been manually set, if so skip */
	if (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO)) {
		dev_dbg(&dev->dev, "  io %d already set to %#llx-%#llx "
			"flags %#lx\n", idx, (unsigned long long) *start,
			(unsigned long long) *end, *flags);
		return 1;
	}

	/* set the initial values */
	*flags |= rule->flags | IORESOURCE_IO;
	*flags &= ~IORESOURCE_UNSET;

	if (!rule->size) {
		*flags |= IORESOURCE_DISABLED;
		dev_dbg(&dev->dev, "  io %d disabled\n", idx);
		return 1;	/* skip disabled resource requests */
	}

	*start = rule->min;
	*end = *start + rule->size - 1;

	/* run through until pnp_check_port is happy */
	while (!pnp_check_port(dev, idx)) {
		*start += rule->align;
		*end = *start + rule->size - 1;
		if (*start > rule->max || !rule->align) {
			dev_dbg(&dev->dev, "  couldn't assign io %d\n", idx);
			return 0;
		}
	}
	dev_dbg(&dev->dev, "  assign io  %d %#llx-%#llx\n", idx,
		(unsigned long long) *start, (unsigned long long) *end);
	return 1;
}

static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
{
	resource_size_t *start, *end;
	unsigned long *flags;

	if (idx >= PNP_MAX_MEM) {
		dev_err(&dev->dev, "too many memory resources\n");
		/* pretend we were successful so at least the manager won't try again */
		return 1;
	}

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

	/* check if this resource has been manually set, if so skip */
	if (!(dev->res.mem_resource[idx].flags & IORESOURCE_AUTO)) {
		dev_dbg(&dev->dev, "  mem %d already set to %#llx-%#llx "
			"flags %#lx\n", idx, (unsigned long long) *start,
			(unsigned long long) *end, *flags);
		return 1;
	}

	/* set the initial values */
	*flags |= rule->flags | IORESOURCE_MEM;
	*flags &= ~IORESOURCE_UNSET;

	/* convert pnp flags to standard Linux flags */
	if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
		*flags |= IORESOURCE_READONLY;
	if (rule->flags & IORESOURCE_MEM_CACHEABLE)
		*flags |= IORESOURCE_CACHEABLE;
	if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
		*flags |= IORESOURCE_RANGELENGTH;
	if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
		*flags |= IORESOURCE_SHADOWABLE;

	if (!rule->size) {
		*flags |= IORESOURCE_DISABLED;
		dev_dbg(&dev->dev, "  mem %d disabled\n", idx);
		return 1;	/* skip disabled resource requests */
	}

	*start = rule->min;
	*end = *start + rule->size - 1;

	/* run through until pnp_check_mem is happy */
	while (!pnp_check_mem(dev, idx)) {
		*start += rule->align;
		*end = *start + rule->size - 1;
		if (*start > rule->max || !rule->align) {
			dev_dbg(&dev->dev, "  couldn't assign mem %d\n", idx);
			return 0;
		}
	}
	dev_dbg(&dev->dev, "  assign mem %d %#llx-%#llx\n", idx,
		(unsigned long long) *start, (unsigned long long) *end);
	return 1;
}

static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
{
	resource_size_t *start, *end;
	unsigned long *flags;
	int i;

	/* IRQ priority: this table is good for i386 */
	static unsigned short xtab[16] = {
		5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
	};

	if (idx >= PNP_MAX_IRQ) {
		dev_err(&dev->dev, "too many IRQ resources\n");
		/* pretend we were successful so at least the manager won't try again */
		return 1;
	}

	start = &dev->res.irq_resource[idx].start;
	end = &dev->res.irq_resource[idx].end;
	flags = &dev->res.irq_resource[idx].flags;

	/* check if this resource has been manually set, if so skip */
	if (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO)) {
		dev_dbg(&dev->dev, "  irq %d already set to %d flags %#lx\n",
			idx, (int) *start, *flags);
		return 1;
	}

	/* set the initial values */
	*flags |= rule->flags | IORESOURCE_IRQ;
	*flags &= ~IORESOURCE_UNSET;

	if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
		*flags |= IORESOURCE_DISABLED;
		dev_dbg(&dev->dev, "  irq %d disabled\n", idx);
		return 1;	/* skip disabled resource requests */
	}

	/* TBD: need check for >16 IRQ */
	*start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
	if (*start < PNP_IRQ_NR) {
		*end = *start;
		dev_dbg(&dev->dev, "  assign irq %d %d\n", idx, (int) *start);
		return 1;
	}
	for (i = 0; i < 16; i++) {
		if (test_bit(xtab[i], rule->map)) {
			*start = *end = xtab[i];
			if (pnp_check_irq(dev, idx)) {
				dev_dbg(&dev->dev, "  assign irq %d %d\n", idx,
					(int) *start);
				return 1;
			}
		}
	}
	dev_dbg(&dev->dev, "  couldn't assign irq %d\n", idx);
	return 0;
}

static void pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
{
	resource_size_t *start, *end;
	unsigned long *flags;
	int i;

	/* DMA priority: this table is good for i386 */
	static unsigned short xtab[8] = {
		1, 3, 5, 6, 7, 0, 2, 4
	};

	if (idx >= PNP_MAX_DMA) {
		dev_err(&dev->dev, "too many DMA resources\n");
		return;
	}

	start = &dev->res.dma_resource[idx].start;
	end = &dev->res.dma_resource[idx].end;
	flags = &dev->res.dma_resource[idx].flags;

	/* check if this resource has been manually set, if so skip */
	if (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO)) {
		dev_dbg(&dev->dev, "  dma %d already set to %d flags %#lx\n",
			idx, (int) *start, *flags);
		return;
	}

	/* set the initial values */
	*flags |= rule->flags | IORESOURCE_DMA;
	*flags &= ~IORESOURCE_UNSET;

	for (i = 0; i < 8; i++) {
		if (rule->map & (1 << xtab[i])) {
			*start = *end = xtab[i];
			if (pnp_check_dma(dev, idx)) {
				dev_dbg(&dev->dev, "  assign dma %d %d\n", idx,
					(int) *start);
				return;
			}
		}
	}
#ifdef MAX_DMA_CHANNELS
	*start = *end = MAX_DMA_CHANNELS;
#endif
	*flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
	dev_dbg(&dev->dev, "  disable dma %d\n", idx);
}

/**
 * pnp_init_resources - Resets a resource table to default values.
 * @table: pointer to the desired resource table
 */
void pnp_init_resource_table(struct pnp_resource_table *table)
{
	int idx;

	for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
		table->irq_resource[idx].name = NULL;
		table->irq_resource[idx].start = -1;
		table->irq_resource[idx].end = -1;
		table->irq_resource[idx].flags =
		    IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
	}
	for (idx = 0; idx < PNP_MAX_DMA; idx++) {
		table->dma_resource[idx].name = NULL;
		table->dma_resource[idx].start = -1;
		table->dma_resource[idx].end = -1;
		table->dma_resource[idx].flags =
		    IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
	}
	for (idx = 0; idx < PNP_MAX_PORT; idx++) {
		table->port_resource[idx].name = NULL;
		table->port_resource[idx].start = 0;
		table->port_resource[idx].end = 0;
		table->port_resource[idx].flags =
		    IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
	}
	for (idx = 0; idx < PNP_MAX_MEM; idx++) {
		table->mem_resource[idx].name = NULL;
		table->mem_resource[idx].start = 0;
		table->mem_resource[idx].end = 0;
		table->mem_resource[idx].flags =
		    IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
	}
}

/**
 * pnp_clean_resources - clears resources that were not manually set
 * @res: the resources to clean
 */
static void pnp_clean_resource_table(struct pnp_resource_table *res)
{
	int idx;

	for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
		if (!(res->irq_resource[idx].flags & IORESOURCE_AUTO))
			continue;
		res->irq_resource[idx].start = -1;
		res->irq_resource[idx].end = -1;
		res->irq_resource[idx].flags =
		    IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
	}
	for (idx = 0; idx < PNP_MAX_DMA; idx++) {
		if (!(res->dma_resource[idx].flags & IORESOURCE_AUTO))
			continue;
		res->dma_resource[idx].start = -1;
		res->dma_resource[idx].end = -1;
		res->dma_resource[idx].flags =
		    IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
	}
	for (idx = 0; idx < PNP_MAX_PORT; idx++) {
		if (!(res->port_resource[idx].flags & IORESOURCE_AUTO))
			continue;
		res->port_resource[idx].start = 0;
		res->port_resource[idx].end = 0;
		res->port_resource[idx].flags =
		    IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
	}
	for (idx = 0; idx < PNP_MAX_MEM; idx++) {
		if (!(res->mem_resource[idx].flags & IORESOURCE_AUTO))
			continue;
		res->mem_resource[idx].start = 0;
		res->mem_resource[idx].end = 0;
		res->mem_resource[idx].flags =
		    IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
	}
}

/**
 * pnp_assign_resources - assigns resources to the device based on the specified dependent number
 * @dev: pointer to the desired device
 * @depnum: the dependent function number
 *
 * Only set depnum to 0 if the device does not have dependent options.
 */
static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
{
	struct pnp_port *port;
	struct pnp_mem *mem;
	struct pnp_irq *irq;
	struct pnp_dma *dma;
	int nport = 0, nmem = 0, nirq = 0, ndma = 0;

	if (!pnp_can_configure(dev))
		return -ENODEV;

	dbg_pnp_show_resources(dev, "before pnp_assign_resources");
	mutex_lock(&pnp_res_mutex);
	pnp_clean_resource_table(&dev->res);	/* start with a fresh slate */
	if (dev->independent) {
		dev_dbg(&dev->dev, "assigning independent options\n");
		port = dev->independent->port;
		mem = dev->independent->mem;
		irq = dev->independent->irq;
		dma = dev->independent->dma;
		while (port) {
			if (!pnp_assign_port(dev, port, nport))
				goto fail;
			nport++;
			port = port->next;
		}
		while (mem) {
			if (!pnp_assign_mem(dev, mem, nmem))
				goto fail;
			nmem++;
			mem = mem->next;
		}
		while (irq) {
			if (!pnp_assign_irq(dev, irq, nirq))
				goto fail;
			nirq++;
			irq = irq->next;
		}
		while (dma) {
			pnp_assign_dma(dev, dma, ndma);
			ndma++;
			dma = dma->next;
		}
	}

	if (depnum) {
		struct pnp_option *dep;
		int i;

		dev_dbg(&dev->dev, "assigning dependent option %d\n", depnum);
		for (i = 1, dep = dev->dependent; i < depnum;
		     i++, dep = dep->next)
			if (!dep)
				goto fail;
		port = dep->port;
		mem = dep->mem;
		irq = dep->irq;
		dma = dep->dma;
		while (port) {
			if (!pnp_assign_port(dev, port, nport))
				goto fail;
			nport++;
			port = port->next;
		}
		while (mem) {
			if (!pnp_assign_mem(dev, mem, nmem))
				goto fail;
			nmem++;
			mem = mem->next;
		}
		while (irq) {
			if (!pnp_assign_irq(dev, irq, nirq))
				goto fail;
			nirq++;
			irq = irq->next;
		}
		while (dma) {
			pnp_assign_dma(dev, dma, ndma);
			ndma++;
			dma = dma->next;
		}
	} else if (dev->dependent)
		goto fail;

	mutex_unlock(&pnp_res_mutex);
	dbg_pnp_show_resources(dev, "after pnp_assign_resources");
	return 1;

fail:
	pnp_clean_resource_table(&dev->res);
	mutex_unlock(&pnp_res_mutex);
	dbg_pnp_show_resources(dev, "after pnp_assign_resources (failed)");
	return 0;
}

/**
 * pnp_manual_config_dev - Disables Auto Config and Manually sets the resource table
 * @dev: pointer to the desired device
 * @res: pointer to the new resource config
 * @mode: 0 or PNP_CONFIG_FORCE
 *
 * This function can be used by drivers that want to manually set thier resources.
 */
int pnp_manual_config_dev(struct pnp_dev *dev, struct pnp_resource_table *res,
			  int mode)
{
	int i;
	struct pnp_resource_table *bak;

	if (!pnp_can_configure(dev))
		return -ENODEV;
	bak = pnp_alloc(sizeof(struct pnp_resource_table));
	if (!bak)
		return -ENOMEM;
	*bak = dev->res;

	mutex_lock(&pnp_res_mutex);
	dev->res = *res;
	if (!(mode & PNP_CONFIG_FORCE)) {
		for (i = 0; i < PNP_MAX_PORT; i++) {
			if (!pnp_check_port(dev, i))
				goto fail;
		}
		for (i = 0; i < PNP_MAX_MEM; i++) {
			if (!pnp_check_mem(dev, i))
				goto fail;
		}
		for (i = 0; i < PNP_MAX_IRQ; i++) {
			if (!pnp_check_irq(dev, i))
				goto fail;
		}
		for (i = 0; i < PNP_MAX_DMA; i++) {
			if (!pnp_check_dma(dev, i))
				goto fail;
		}
	}
	mutex_unlock(&pnp_res_mutex);

	kfree(bak);
	return 0;

fail:
	dev->res = *bak;
	mutex_unlock(&pnp_res_mutex);
	kfree(bak);
	return -EINVAL;
}

/**
 * pnp_auto_config_dev - automatically assigns resources to a device
 * @dev: pointer to the desired device
 */
int pnp_auto_config_dev(struct pnp_dev *dev)
{
	struct pnp_option *dep;
	int i = 1;

	if (!pnp_can_configure(dev)) {
		dev_dbg(&dev->dev, "configuration not supported\n");
		return -ENODEV;
	}

	if (!dev->dependent) {
		if (pnp_assign_resources(dev, 0))
			return 0;
	} else {
		dep = dev->dependent;
		do {
			if (pnp_assign_resources(dev, i))
				return 0;
			dep = dep->next;
			i++;
		} while (dep);
	}

	dev_err(&dev->dev, "unable to assign resources\n");
	return -EBUSY;
}

/**
 * pnp_start_dev - low-level start of the PnP device
 * @dev: pointer to the desired device
 *
 * assumes that resources have already been allocated
 */
int pnp_start_dev(struct pnp_dev *dev)
{
	if (!pnp_can_write(dev)) {
		dev_dbg(&dev->dev, "activation not supported\n");
		return -EINVAL;
	}

	dbg_pnp_show_resources(dev, "pnp_start_dev");
	if (dev->protocol->set(dev) < 0) {
		dev_err(&dev->dev, "activation failed\n");
		return -EIO;
	}

	dev_info(&dev->dev, "activated\n");
	return 0;
}

/**
 * pnp_stop_dev - low-level disable of the PnP device
 * @dev: pointer to the desired device
 *
 * does not free resources
 */
int pnp_stop_dev(struct pnp_dev *dev)
{
	if (!pnp_can_disable(dev)) {
		dev_dbg(&dev->dev, "disabling not supported\n");
		return -EINVAL;
	}
	if (dev->protocol->disable(dev) < 0) {
		dev_err(&dev->dev, "disable failed\n");
		return -EIO;
	}

	dev_info(&dev->dev, "disabled\n");
	return 0;
}

/**
 * pnp_activate_dev - activates a PnP device for use
 * @dev: pointer to the desired device
 *
 * does not validate or set resources so be careful.
 */
int pnp_activate_dev(struct pnp_dev *dev)
{
	int error;

	if (dev->active)
		return 0;

	/* ensure resources are allocated */
	if (pnp_auto_config_dev(dev))
		return -EBUSY;

	error = pnp_start_dev(dev);
	if (error)
		return error;

	dev->active = 1;
	return 0;
}

/**
 * pnp_disable_dev - disables device
 * @dev: pointer to the desired device
 *
 * inform the correct pnp protocol so that resources can be used by other devices
 */
int pnp_disable_dev(struct pnp_dev *dev)
{
	int error;

	if (!dev->active)
		return 0;

	error = pnp_stop_dev(dev);
	if (error)
		return error;

	dev->active = 0;

	/* release the resources so that other devices can use them */
	mutex_lock(&pnp_res_mutex);
	pnp_clean_resource_table(&dev->res);
	mutex_unlock(&pnp_res_mutex);

	return 0;
}

/**
 * pnp_resource_change - change one resource
 * @resource: pointer to resource to be changed
 * @start: start of region
 * @size: size of region
 */
void pnp_resource_change(struct resource *resource, resource_size_t start,
			 resource_size_t size)
{
	resource->flags &= ~(IORESOURCE_AUTO | IORESOURCE_UNSET);
	resource->start = start;
	resource->end = start + size - 1;
}

EXPORT_SYMBOL(pnp_manual_config_dev);
EXPORT_SYMBOL(pnp_start_dev);
EXPORT_SYMBOL(pnp_stop_dev);
EXPORT_SYMBOL(pnp_activate_dev);
EXPORT_SYMBOL(pnp_disable_dev);
EXPORT_SYMBOL(pnp_resource_change);
EXPORT_SYMBOL(pnp_init_resource_table);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
	3	*
c1017a4c	4	* based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
1da177e4	5	* Copyright 2003 Adam Belay <ambx1@neo.rr.com>
1da177e4 LT	6	*/
1da177e4 LT	7
1da177e4 LT	8	#include <linux/errno.h>
	9	#include <linux/module.h>
	10	#include <linux/init.h>
	11	#include <linux/kernel.h>
1da177e4	12	#include <linux/pnp.h>
4e57b681 TS	13	#include <linux/slab.h>
4e57b681 TS	14	#include <linux/bitmap.h>
b3bd86e2	15	#include <linux/mutex.h>
1da177e4 LT	16	#include "base.h"
1da177e4 LT	17
b3bd86e2	18	DEFINE_MUTEX(pnp_res_mutex);
1da177e4 LT	19
	20	static int pnp_assign_port(struct pnp_dev dev, struct pnp_port rule, int idx)
	21	{
b60ba834 GKH	22	resource_size_t start, end;
b60ba834 GKH	23	unsigned long *flags;
1da177e4	24
1da177e4	25	if (idx >= PNP_MAX_PORT) {
a05d0781	26	dev_err(&dev->dev, "too many I/O port resources\n");
1da177e4 LT	27	/* pretend we were successful so at least the manager won't try again */
	28	return 1;
	29	}
	30
1da177e4 LT	31	start = &dev->res.port_resource[idx].start;
	32	end = &dev->res.port_resource[idx].end;
	33	flags = &dev->res.port_resource[idx].flags;
	34
81b5c75f BH	35	/* check if this resource has been manually set, if so skip */
	36	if (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO)) {
	37	dev_dbg(&dev->dev, " io %d already set to %#llx-%#llx "
	38	"flags %#lx\n", idx, (unsigned long long) *start,
	39	(unsigned long long) end, flags);
	40	return 1;
	41	}
	42
1da177e4 LT	43	/* set the initial values */
1da177e4 LT	44	*flags \|= rule->flags \| IORESOURCE_IO;
9dd78466	45	*flags &= ~IORESOURCE_UNSET;
1da177e4 LT	46
	47	if (!rule->size) {
	48	*flags \|= IORESOURCE_DISABLED;
81b5c75f	49	dev_dbg(&dev->dev, " io %d disabled\n", idx);
9dd78466	50	return 1; /* skip disabled resource requests */
1da177e4 LT	51	}
	52
	53	*start = rule->min;
	54	end = start + rule->size - 1;
	55
	56	/* run through until pnp_check_port is happy */
	57	while (!pnp_check_port(dev, idx)) {
	58	*start += rule->align;
	59	end = start + rule->size - 1;
81b5c75f BH	60	if (*start > rule->max \|\| !rule->align) {
81b5c75f BH	61	dev_dbg(&dev->dev, " couldn't assign io %d\n", idx);
1da177e4	62	return 0;
81b5c75f	63	}
1da177e4	64	}
81b5c75f BH	65	dev_dbg(&dev->dev, " assign io %d %#llx-%#llx\n", idx,
81b5c75f BH	66	(unsigned long long) start, (unsigned long long) end);
1da177e4 LT	67	return 1;
	68	}
	69
	70	static int pnp_assign_mem(struct pnp_dev dev, struct pnp_mem rule, int idx)
	71	{
b60ba834 GKH	72	resource_size_t start, end;
b60ba834 GKH	73	unsigned long *flags;
1da177e4	74
1da177e4	75	if (idx >= PNP_MAX_MEM) {
a05d0781	76	dev_err(&dev->dev, "too many memory resources\n");
1da177e4 LT	77	/* pretend we were successful so at least the manager won't try again */
	78	return 1;
	79	}
	80
1da177e4 LT	81	start = &dev->res.mem_resource[idx].start;
	82	end = &dev->res.mem_resource[idx].end;
	83	flags = &dev->res.mem_resource[idx].flags;
	84
81b5c75f BH	85	/* check if this resource has been manually set, if so skip */
	86	if (!(dev->res.mem_resource[idx].flags & IORESOURCE_AUTO)) {
	87	dev_dbg(&dev->dev, " mem %d already set to %#llx-%#llx "
	88	"flags %#lx\n", idx, (unsigned long long) *start,
	89	(unsigned long long) end, flags);
	90	return 1;
	91	}
	92
1da177e4 LT	93	/* set the initial values */
1da177e4 LT	94	*flags \|= rule->flags \| IORESOURCE_MEM;
9dd78466	95	*flags &= ~IORESOURCE_UNSET;
1da177e4 LT	96
	97	/* convert pnp flags to standard Linux flags */
	98	if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
	99	*flags \|= IORESOURCE_READONLY;
	100	if (rule->flags & IORESOURCE_MEM_CACHEABLE)
	101	*flags \|= IORESOURCE_CACHEABLE;
	102	if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
	103	*flags \|= IORESOURCE_RANGELENGTH;
	104	if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
	105	*flags \|= IORESOURCE_SHADOWABLE;
	106
	107	if (!rule->size) {
	108	*flags \|= IORESOURCE_DISABLED;
81b5c75f	109	dev_dbg(&dev->dev, " mem %d disabled\n", idx);
9dd78466	110	return 1; /* skip disabled resource requests */
1da177e4 LT	111	}
	112
	113	*start = rule->min;
9dd78466	114	end = start + rule->size - 1;
1da177e4 LT	115
	116	/* run through until pnp_check_mem is happy */
	117	while (!pnp_check_mem(dev, idx)) {
	118	*start += rule->align;
	119	end = start + rule->size - 1;
81b5c75f BH	120	if (*start > rule->max \|\| !rule->align) {
81b5c75f BH	121	dev_dbg(&dev->dev, " couldn't assign mem %d\n", idx);
1da177e4	122	return 0;
81b5c75f	123	}
1da177e4	124	}
81b5c75f BH	125	dev_dbg(&dev->dev, " assign mem %d %#llx-%#llx\n", idx,
81b5c75f BH	126	(unsigned long long) start, (unsigned long long) end);
1da177e4 LT	127	return 1;
	128	}
	129
9dd78466	130	static int pnp_assign_irq(struct pnp_dev dev, struct pnp_irq rule, int idx)
1da177e4	131	{
b60ba834 GKH	132	resource_size_t start, end;
b60ba834 GKH	133	unsigned long *flags;
1da177e4 LT	134	int i;
	135
	136	/* IRQ priority: this table is good for i386 */
	137	static unsigned short xtab[16] = {
	138	5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
	139	};
	140
1da177e4	141	if (idx >= PNP_MAX_IRQ) {
a05d0781	142	dev_err(&dev->dev, "too many IRQ resources\n");
1da177e4 LT	143	/* pretend we were successful so at least the manager won't try again */
	144	return 1;
	145	}
	146
1da177e4 LT	147	start = &dev->res.irq_resource[idx].start;
	148	end = &dev->res.irq_resource[idx].end;
	149	flags = &dev->res.irq_resource[idx].flags;
	150
81b5c75f BH	151	/* check if this resource has been manually set, if so skip */
	152	if (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO)) {
	153	dev_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n",
	154	idx, (int) start, flags);
	155	return 1;
	156	}
	157
1da177e4 LT	158	/* set the initial values */
1da177e4 LT	159	*flags \|= rule->flags \| IORESOURCE_IRQ;
9dd78466	160	*flags &= ~IORESOURCE_UNSET;
1da177e4 LT	161
	162	if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
	163	*flags \|= IORESOURCE_DISABLED;
81b5c75f	164	dev_dbg(&dev->dev, " irq %d disabled\n", idx);
9dd78466	165	return 1; /* skip disabled resource requests */
1da177e4 LT	166	}
	167
	168	/* TBD: need check for >16 IRQ */
	169	*start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
	170	if (*start < PNP_IRQ_NR) {
	171	end = start;
81b5c75f	172	dev_dbg(&dev->dev, " assign irq %d %d\n", idx, (int) *start);
1da177e4 LT	173	return 1;
	174	}
	175	for (i = 0; i < 16; i++) {
9dd78466	176	if (test_bit(xtab[i], rule->map)) {
1da177e4	177	start = end = xtab[i];
81b5c75f BH	178	if (pnp_check_irq(dev, idx)) {
	179	dev_dbg(&dev->dev, " assign irq %d %d\n", idx,
	180	(int) *start);
1da177e4	181	return 1;
81b5c75f	182	}
1da177e4 LT	183	}
1da177e4 LT	184	}
81b5c75f	185	dev_dbg(&dev->dev, " couldn't assign irq %d\n", idx);
1da177e4 LT	186	return 0;
	187	}
	188
7ef36390	189	static void pnp_assign_dma(struct pnp_dev dev, struct pnp_dma rule, int idx)
1da177e4	190	{
b60ba834 GKH	191	resource_size_t start, end;
b60ba834 GKH	192	unsigned long *flags;
1da177e4 LT	193	int i;
	194
	195	/* DMA priority: this table is good for i386 */
	196	static unsigned short xtab[8] = {
	197	1, 3, 5, 6, 7, 0, 2, 4
	198	};
	199
1da177e4	200	if (idx >= PNP_MAX_DMA) {
a05d0781	201	dev_err(&dev->dev, "too many DMA resources\n");
7ef36390	202	return;
1da177e4 LT	203	}
1da177e4 LT	204
1da177e4 LT	205	start = &dev->res.dma_resource[idx].start;
	206	end = &dev->res.dma_resource[idx].end;
	207	flags = &dev->res.dma_resource[idx].flags;
	208
81b5c75f BH	209	/* check if this resource has been manually set, if so skip */
	210	if (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO)) {
	211	dev_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n",
	212	idx, (int) start, flags);
	213	return;
	214	}
	215
1da177e4 LT	216	/* set the initial values */
1da177e4 LT	217	*flags \|= rule->flags \| IORESOURCE_DMA;
9dd78466	218	*flags &= ~IORESOURCE_UNSET;
1da177e4	219
1da177e4	220	for (i = 0; i < 8; i++) {
9dd78466	221	if (rule->map & (1 << xtab[i])) {
1da177e4	222	start = end = xtab[i];
81b5c75f BH	223	if (pnp_check_dma(dev, idx)) {
	224	dev_dbg(&dev->dev, " assign dma %d %d\n", idx,
	225	(int) *start);
7ef36390	226	return;
81b5c75f	227	}
1da177e4 LT	228	}
1da177e4 LT	229	}
7ef36390 JB	230	#ifdef MAX_DMA_CHANNELS
	231	start = end = MAX_DMA_CHANNELS;
	232	#endif
	233	*flags \|= IORESOURCE_UNSET \| IORESOURCE_DISABLED;
81b5c75f	234	dev_dbg(&dev->dev, " disable dma %d\n", idx);
1da177e4 LT	235	}
	236
	237	/**
	238	* pnp_init_resources - Resets a resource table to default values.
	239	* @table: pointer to the desired resource table
1da177e4 LT	240	*/
	241	void pnp_init_resource_table(struct pnp_resource_table *table)
	242	{
	243	int idx;
07d4e9af	244
1da177e4 LT	245	for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
	246	table->irq_resource[idx].name = NULL;
	247	table->irq_resource[idx].start = -1;
	248	table->irq_resource[idx].end = -1;
9dd78466 BH	249	table->irq_resource[idx].flags =
9dd78466 BH	250	IORESOURCE_IRQ \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
1da177e4 LT	251	}
	252	for (idx = 0; idx < PNP_MAX_DMA; idx++) {
	253	table->dma_resource[idx].name = NULL;
	254	table->dma_resource[idx].start = -1;
	255	table->dma_resource[idx].end = -1;
9dd78466 BH	256	table->dma_resource[idx].flags =
9dd78466 BH	257	IORESOURCE_DMA \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
1da177e4 LT	258	}
	259	for (idx = 0; idx < PNP_MAX_PORT; idx++) {
	260	table->port_resource[idx].name = NULL;
	261	table->port_resource[idx].start = 0;
	262	table->port_resource[idx].end = 0;
9dd78466 BH	263	table->port_resource[idx].flags =
9dd78466 BH	264	IORESOURCE_IO \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
1da177e4 LT	265	}
	266	for (idx = 0; idx < PNP_MAX_MEM; idx++) {
	267	table->mem_resource[idx].name = NULL;
	268	table->mem_resource[idx].start = 0;
	269	table->mem_resource[idx].end = 0;
9dd78466 BH	270	table->mem_resource[idx].flags =
9dd78466 BH	271	IORESOURCE_MEM \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
1da177e4 LT	272	}
	273	}
	274
	275	/**
	276	* pnp_clean_resources - clears resources that were not manually set
67be2dd1	277	* @res: the resources to clean
1da177e4	278	*/
9dd78466	279	static void pnp_clean_resource_table(struct pnp_resource_table *res)
1da177e4 LT	280	{
1da177e4 LT	281	int idx;
07d4e9af	282
1da177e4 LT	283	for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
	284	if (!(res->irq_resource[idx].flags & IORESOURCE_AUTO))
	285	continue;
	286	res->irq_resource[idx].start = -1;
	287	res->irq_resource[idx].end = -1;
9dd78466 BH	288	res->irq_resource[idx].flags =
9dd78466 BH	289	IORESOURCE_IRQ \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
1da177e4 LT	290	}
	291	for (idx = 0; idx < PNP_MAX_DMA; idx++) {
	292	if (!(res->dma_resource[idx].flags & IORESOURCE_AUTO))
	293	continue;
	294	res->dma_resource[idx].start = -1;
	295	res->dma_resource[idx].end = -1;
9dd78466 BH	296	res->dma_resource[idx].flags =
9dd78466 BH	297	IORESOURCE_DMA \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
1da177e4 LT	298	}
	299	for (idx = 0; idx < PNP_MAX_PORT; idx++) {
	300	if (!(res->port_resource[idx].flags & IORESOURCE_AUTO))
	301	continue;
	302	res->port_resource[idx].start = 0;
	303	res->port_resource[idx].end = 0;
9dd78466 BH	304	res->port_resource[idx].flags =
9dd78466 BH	305	IORESOURCE_IO \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
1da177e4 LT	306	}
	307	for (idx = 0; idx < PNP_MAX_MEM; idx++) {
	308	if (!(res->mem_resource[idx].flags & IORESOURCE_AUTO))
	309	continue;
	310	res->mem_resource[idx].start = 0;
	311	res->mem_resource[idx].end = 0;
9dd78466 BH	312	res->mem_resource[idx].flags =
9dd78466 BH	313	IORESOURCE_MEM \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
1da177e4 LT	314	}
	315	}
	316
	317	/**
	318	* pnp_assign_resources - assigns resources to the device based on the specified dependent number
	319	* @dev: pointer to the desired device
	320	* @depnum: the dependent function number
	321	*
	322	* Only set depnum to 0 if the device does not have dependent options.
	323	*/
	324	static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
	325	{
	326	struct pnp_port *port;
	327	struct pnp_mem *mem;
	328	struct pnp_irq *irq;
	329	struct pnp_dma *dma;
	330	int nport = 0, nmem = 0, nirq = 0, ndma = 0;
	331
	332	if (!pnp_can_configure(dev))
	333	return -ENODEV;
	334
81b5c75f	335	dbg_pnp_show_resources(dev, "before pnp_assign_resources");
b3bd86e2	336	mutex_lock(&pnp_res_mutex);
9dd78466	337	pnp_clean_resource_table(&dev->res); /* start with a fresh slate */
1da177e4	338	if (dev->independent) {
81b5c75f	339	dev_dbg(&dev->dev, "assigning independent options\n");
1da177e4 LT	340	port = dev->independent->port;
	341	mem = dev->independent->mem;
	342	irq = dev->independent->irq;
	343	dma = dev->independent->dma;
	344	while (port) {
	345	if (!pnp_assign_port(dev, port, nport))
	346	goto fail;
	347	nport++;
	348	port = port->next;
	349	}
	350	while (mem) {
	351	if (!pnp_assign_mem(dev, mem, nmem))
	352	goto fail;
	353	nmem++;
	354	mem = mem->next;
	355	}
	356	while (irq) {
	357	if (!pnp_assign_irq(dev, irq, nirq))
	358	goto fail;
	359	nirq++;
	360	irq = irq->next;
	361	}
	362	while (dma) {
7ef36390	363	pnp_assign_dma(dev, dma, ndma);
1da177e4 LT	364	ndma++;
	365	dma = dma->next;
	366	}
	367	}
	368
	369	if (depnum) {
	370	struct pnp_option *dep;
	371	int i;
81b5c75f BH	372
81b5c75f BH	373	dev_dbg(&dev->dev, "assigning dependent option %d\n", depnum);
9dd78466 BH	374	for (i = 1, dep = dev->dependent; i < depnum;
	375	i++, dep = dep->next)
	376	if (!dep)
1da177e4	377	goto fail;
9dd78466	378	port = dep->port;
1da177e4 LT	379	mem = dep->mem;
	380	irq = dep->irq;
	381	dma = dep->dma;
	382	while (port) {
	383	if (!pnp_assign_port(dev, port, nport))
	384	goto fail;
	385	nport++;
	386	port = port->next;
	387	}
	388	while (mem) {
	389	if (!pnp_assign_mem(dev, mem, nmem))
	390	goto fail;
	391	nmem++;
	392	mem = mem->next;
	393	}
	394	while (irq) {
	395	if (!pnp_assign_irq(dev, irq, nirq))
	396	goto fail;
	397	nirq++;
	398	irq = irq->next;
	399	}
	400	while (dma) {
7ef36390	401	pnp_assign_dma(dev, dma, ndma);
1da177e4 LT	402	ndma++;
	403	dma = dma->next;
	404	}
	405	} else if (dev->dependent)
	406	goto fail;
	407
b3bd86e2	408	mutex_unlock(&pnp_res_mutex);
81b5c75f	409	dbg_pnp_show_resources(dev, "after pnp_assign_resources");
1da177e4 LT	410	return 1;
1da177e4 LT	411
1e0aa9ad	412	fail:
1da177e4	413	pnp_clean_resource_table(&dev->res);
b3bd86e2	414	mutex_unlock(&pnp_res_mutex);
81b5c75f	415	dbg_pnp_show_resources(dev, "after pnp_assign_resources (failed)");
1da177e4 LT	416	return 0;
	417	}
	418
	419	/**
	420	* pnp_manual_config_dev - Disables Auto Config and Manually sets the resource table
	421	* @dev: pointer to the desired device
	422	* @res: pointer to the new resource config
3d41088f	423	* @mode: 0 or PNP_CONFIG_FORCE
1da177e4 LT	424	*
	425	* This function can be used by drivers that want to manually set thier resources.
	426	*/
9dd78466 BH	427	int pnp_manual_config_dev(struct pnp_dev dev, struct pnp_resource_table res,
9dd78466 BH	428	int mode)
1da177e4 LT	429	{
1da177e4 LT	430	int i;
9dd78466	431	struct pnp_resource_table *bak;
07d4e9af	432
1da177e4 LT	433	if (!pnp_can_configure(dev))
	434	return -ENODEV;
	435	bak = pnp_alloc(sizeof(struct pnp_resource_table));
	436	if (!bak)
	437	return -ENOMEM;
	438	*bak = dev->res;
	439
b3bd86e2	440	mutex_lock(&pnp_res_mutex);
1da177e4 LT	441	dev->res = *res;
	442	if (!(mode & PNP_CONFIG_FORCE)) {
	443	for (i = 0; i < PNP_MAX_PORT; i++) {
9dd78466	444	if (!pnp_check_port(dev, i))
1da177e4 LT	445	goto fail;
	446	}
	447	for (i = 0; i < PNP_MAX_MEM; i++) {
9dd78466	448	if (!pnp_check_mem(dev, i))
1da177e4 LT	449	goto fail;
	450	}
	451	for (i = 0; i < PNP_MAX_IRQ; i++) {
9dd78466	452	if (!pnp_check_irq(dev, i))
1da177e4 LT	453	goto fail;
	454	}
	455	for (i = 0; i < PNP_MAX_DMA; i++) {
9dd78466	456	if (!pnp_check_dma(dev, i))
1da177e4 LT	457	goto fail;
	458	}
	459	}
b3bd86e2	460	mutex_unlock(&pnp_res_mutex);
1da177e4 LT	461
	462	kfree(bak);
	463	return 0;
	464
1e0aa9ad	465	fail:
1da177e4	466	dev->res = *bak;
b3bd86e2	467	mutex_unlock(&pnp_res_mutex);
1da177e4 LT	468	kfree(bak);
	469	return -EINVAL;
	470	}
	471
	472	/**
	473	* pnp_auto_config_dev - automatically assigns resources to a device
	474	* @dev: pointer to the desired device
1da177e4 LT	475	*/
	476	int pnp_auto_config_dev(struct pnp_dev *dev)
	477	{
	478	struct pnp_option *dep;
	479	int i = 1;
	480
9dd78466	481	if (!pnp_can_configure(dev)) {
a05d0781	482	dev_dbg(&dev->dev, "configuration not supported\n");
1da177e4 LT	483	return -ENODEV;
	484	}
	485
	486	if (!dev->dependent) {
	487	if (pnp_assign_resources(dev, 0))
	488	return 0;
	489	} else {
	490	dep = dev->dependent;
	491	do {
	492	if (pnp_assign_resources(dev, i))
	493	return 0;
	494	dep = dep->next;
	495	i++;
	496	} while (dep);
	497	}
	498
a05d0781	499	dev_err(&dev->dev, "unable to assign resources\n");
1da177e4 LT	500	return -EBUSY;
	501	}
	502
68094e32 PO	503	/**
	504	* pnp_start_dev - low-level start of the PnP device
	505	* @dev: pointer to the desired device
	506	*
07d4e9af	507	* assumes that resources have already been allocated
68094e32	508	*/
68094e32 PO	509	int pnp_start_dev(struct pnp_dev *dev)
	510	{
	511	if (!pnp_can_write(dev)) {
a05d0781	512	dev_dbg(&dev->dev, "activation not supported\n");
68094e32 PO	513	return -EINVAL;
	514	}
	515
81b5c75f	516	dbg_pnp_show_resources(dev, "pnp_start_dev");
59284cb4	517	if (dev->protocol->set(dev) < 0) {
a05d0781	518	dev_err(&dev->dev, "activation failed\n");
68094e32 PO	519	return -EIO;
	520	}
	521
a05d0781	522	dev_info(&dev->dev, "activated\n");
68094e32 PO	523	return 0;
	524	}
	525
	526	/**
	527	* pnp_stop_dev - low-level disable of the PnP device
	528	* @dev: pointer to the desired device
	529	*
	530	* does not free resources
	531	*/
68094e32 PO	532	int pnp_stop_dev(struct pnp_dev *dev)
	533	{
	534	if (!pnp_can_disable(dev)) {
a05d0781	535	dev_dbg(&dev->dev, "disabling not supported\n");
68094e32 PO	536	return -EINVAL;
68094e32 PO	537	}
9dd78466	538	if (dev->protocol->disable(dev) < 0) {
a05d0781	539	dev_err(&dev->dev, "disable failed\n");
68094e32 PO	540	return -EIO;
	541	}
	542
a05d0781	543	dev_info(&dev->dev, "disabled\n");
68094e32 PO	544	return 0;
	545	}
	546
1da177e4 LT	547	/**
	548	* pnp_activate_dev - activates a PnP device for use
	549	* @dev: pointer to the desired device
	550	*
	551	* does not validate or set resources so be careful.
	552	*/
	553	int pnp_activate_dev(struct pnp_dev *dev)
	554	{
68094e32 PO	555	int error;
68094e32 PO	556
07d4e9af	557	if (dev->active)
cc8259a6	558	return 0;
1da177e4 LT	559
	560	/* ensure resources are allocated */
	561	if (pnp_auto_config_dev(dev))
	562	return -EBUSY;
	563
68094e32 PO	564	error = pnp_start_dev(dev);
	565	if (error)
	566	return error;
1da177e4 LT	567
1da177e4 LT	568	dev->active = 1;
cc8259a6	569	return 0;
1da177e4 LT	570	}
	571
	572	/**
	573	* pnp_disable_dev - disables device
	574	* @dev: pointer to the desired device
	575	*
	576	* inform the correct pnp protocol so that resources can be used by other devices
	577	*/
	578	int pnp_disable_dev(struct pnp_dev *dev)
	579	{
68094e32 PO	580	int error;
68094e32 PO	581
07d4e9af	582	if (!dev->active)
cc8259a6	583	return 0;
1da177e4	584
68094e32 PO	585	error = pnp_stop_dev(dev);
	586	if (error)
	587	return error;
1da177e4 LT	588
1da177e4 LT	589	dev->active = 0;
1da177e4 LT	590
1da177e4 LT	591	/* release the resources so that other devices can use them */
b3bd86e2	592	mutex_lock(&pnp_res_mutex);
1da177e4	593	pnp_clean_resource_table(&dev->res);
b3bd86e2	594	mutex_unlock(&pnp_res_mutex);
1da177e4	595
cc8259a6	596	return 0;
1da177e4 LT	597	}
	598
	599	/**
	600	* pnp_resource_change - change one resource
	601	* @resource: pointer to resource to be changed
	602	* @start: start of region
	603	* @size: size of region
1da177e4	604	*/
b60ba834	605	void pnp_resource_change(struct resource *resource, resource_size_t start,
9dd78466	606	resource_size_t size)
1da177e4	607	{
1da177e4 LT	608	resource->flags &= ~(IORESOURCE_AUTO \| IORESOURCE_UNSET);
	609	resource->start = start;
	610	resource->end = start + size - 1;
	611	}
	612
1da177e4	613	EXPORT_SYMBOL(pnp_manual_config_dev);
68094e32 PO	614	EXPORT_SYMBOL(pnp_start_dev);
68094e32 PO	615	EXPORT_SYMBOL(pnp_stop_dev);
1da177e4 LT	616	EXPORT_SYMBOL(pnp_activate_dev);
	617	EXPORT_SYMBOL(pnp_disable_dev);
	618	EXPORT_SYMBOL(pnp_resource_change);
	619	EXPORT_SYMBOL(pnp_init_resource_table);