[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 <[email protected]>
 * Copyright 2003 Adam Belay <[email protected]>
 *
 */

#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 "base.h"

DECLARE_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 (!dev || !rule)
		return -EINVAL;

	if (idx >= PNP_MAX_PORT) {
		pnp_err("More than 4 ports is incompatible with pnp specifications.");
		/* pretend we were successful so at least the manager won't try again */
		return 1;
	}

	/* check if this resource has been manually set, if so skip */
	if (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO))
		return 1;

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

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

	if (!rule->size) {
		*flags |= IORESOURCE_DISABLED;
		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)
			return 0;
	}
	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 (!dev || !rule)
		return -EINVAL;

	if (idx >= PNP_MAX_MEM) {
		pnp_err("More than 8 mems is incompatible with pnp specifications.");
		/* pretend we were successful so at least the manager won't try again */
		return 1;
	}

	/* check if this resource has been manually set, if so skip */
	if (!(dev->res.mem_resource[idx].flags & IORESOURCE_AUTO))
		return 1;

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

	/* 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;
		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)
			return 0;
	}
	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 (!dev || !rule)
		return -EINVAL;

	if (idx >= PNP_MAX_IRQ) {
		pnp_err("More than 2 irqs is incompatible with pnp specifications.");
		/* pretend we were successful so at least the manager won't try again */
		return 1;
	}

	/* check if this resource has been manually set, if so skip */
	if (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO))
		return 1;

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

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

	if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
		*flags |= IORESOURCE_DISABLED;
		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;
		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))
				return 1;
		}
	}
	return 0;
}

static int 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 (!dev || !rule)
		return -EINVAL;

	if (idx >= PNP_MAX_DMA) {
		pnp_err("More than 2 dmas is incompatible with pnp specifications.");
		/* pretend we were successful so at least the manager won't try again */
		return 1;
	}

	/* check if this resource has been manually set, if so skip */
	if (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO))
		return 1;

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

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

	if (!rule->map) {
		*flags |= IORESOURCE_DISABLED;
		return 1; /* skip disabled resource requests */
	}

	for (i = 0; i < 8; i++) {
		if(rule->map & (1<<xtab[i])) {
			*start = *end = xtab[i];
			if(pnp_check_dma(dev, idx))
				return 1;
		}
	}
	return 0;
}

/**
 * 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;

	down(&pnp_res_mutex);
	pnp_clean_resource_table(&dev->res); /* start with a fresh slate */
	if (dev->independent) {
		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) {
			if (!pnp_assign_dma(dev, dma, ndma))
				goto fail;
			ndma++;
			dma = dma->next;
		}
	}

	if (depnum) {
		struct pnp_option *dep;
		int i;
		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) {
			if (!pnp_assign_dma(dev, dma, ndma))
				goto fail;
			ndma++;
			dma = dma->next;
		}
	} else if (dev->dependent)
		goto fail;

	up(&pnp_res_mutex);
	return 1;

fail:
	pnp_clean_resource_table(&dev->res);
	up(&pnp_res_mutex);
	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 (!dev || !res)
		return -EINVAL;
	if (!pnp_can_configure(dev))
		return -ENODEV;
	bak = pnp_alloc(sizeof(struct pnp_resource_table));
	if (!bak)
		return -ENOMEM;
	*bak = dev->res;

	down(&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;
		}
	}
	up(&pnp_res_mutex);

	kfree(bak);
	return 0;

fail:
	dev->res = *bak;
	up(&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(!dev)
		return -EINVAL;

	if(!pnp_can_configure(dev)) {
		pnp_info("Device %s does not support resource configuration.", dev->dev.bus_id);
		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);
	}

	pnp_err("Unable to assign resources to device %s.", dev->dev.bus_id);
	return -EBUSY;
}

/**
 * pnp_start_dev - low-level start of the PnP device
 * @dev: pointer to the desired device
 *
 * assumes that resources have alread been allocated
 */

int pnp_start_dev(struct pnp_dev *dev)
{
	if (!pnp_can_write(dev)) {
		pnp_info("Device %s does not support activation.", dev->dev.bus_id);
		return -EINVAL;
	}

	if (dev->protocol->set(dev, &dev->res)<0) {
		pnp_err("Failed to activate device %s.", dev->dev.bus_id);
		return -EIO;
	}

	pnp_info("Device %s activated.", dev->dev.bus_id);

	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)) {
		pnp_info("Device %s does not support disabling.", dev->dev.bus_id);
		return -EINVAL;
	}
	if (dev->protocol->disable(dev)<0) {
		pnp_err("Failed to disable device %s.", dev->dev.bus_id);
		return -EIO;
	}

	pnp_info("Device %s disabled.", dev->dev.bus_id);

	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)
		return -EINVAL;
	if (dev->active) {
		return 0; /* the device is already active */
	}

	/* 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 1;
}

/**
 * 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)
                return -EINVAL;
	if (!dev->active) {
		return 0; /* the device is already disabled */
	}

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

	dev->active = 0;

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

	return 1;
}

/**
 * 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)
{
	if (resource == NULL)
		return;
	resource->flags &= ~(IORESOURCE_AUTO | IORESOURCE_UNSET);
	resource->start = start;
	resource->end = start + size - 1;
}


EXPORT_SYMBOL(pnp_manual_config_dev);
#if 0
EXPORT_SYMBOL(pnp_auto_config_dev);
#endif
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	*
	4	* based on isapnp.c resource management (c) Jaroslav Kysela <[email protected]>
	5	* Copyright 2003 Adam Belay <[email protected]>
	6	*
	7	*/
	8
1da177e4 LT	9	#include <linux/errno.h>
	10	#include <linux/module.h>
	11	#include <linux/init.h>
	12	#include <linux/kernel.h>
1da177e4	13	#include <linux/pnp.h>
4e57b681 TS	14	#include <linux/slab.h>
4e57b681 TS	15	#include <linux/bitmap.h>
1da177e4 LT	16	#include "base.h"
	17
	18	DECLARE_MUTEX(pnp_res_mutex);
	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 LT	24
	25	if (!dev \|\| !rule)
	26	return -EINVAL;
	27
	28	if (idx >= PNP_MAX_PORT) {
	29	pnp_err("More than 4 ports is incompatible with pnp specifications.");
	30	/* pretend we were successful so at least the manager won't try again */
	31	return 1;
	32	}
	33
	34	/* check if this resource has been manually set, if so skip */
	35	if (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO))
	36	return 1;
	37
	38	start = &dev->res.port_resource[idx].start;
	39	end = &dev->res.port_resource[idx].end;
	40	flags = &dev->res.port_resource[idx].flags;
	41
	42	/* set the initial values */
	43	*flags \|= rule->flags \| IORESOURCE_IO;
	44	*flags &= ~IORESOURCE_UNSET;
	45
	46	if (!rule->size) {
	47	*flags \|= IORESOURCE_DISABLED;
	48	return 1; /* skip disabled resource requests */
	49	}
	50
	51	*start = rule->min;
	52	end = start + rule->size - 1;
	53
	54	/* run through until pnp_check_port is happy */
	55	while (!pnp_check_port(dev, idx)) {
	56	*start += rule->align;
	57	end = start + rule->size - 1;
	58	if (*start > rule->max \|\| !rule->align)
	59	return 0;
	60	}
	61	return 1;
	62	}
	63
	64	static int pnp_assign_mem(struct pnp_dev dev, struct pnp_mem rule, int idx)
	65	{
b60ba834 GKH	66	resource_size_t start, end;
b60ba834 GKH	67	unsigned long *flags;
1da177e4 LT	68
	69	if (!dev \|\| !rule)
	70	return -EINVAL;
	71
	72	if (idx >= PNP_MAX_MEM) {
	73	pnp_err("More than 8 mems is incompatible with pnp specifications.");
	74	/* pretend we were successful so at least the manager won't try again */
	75	return 1;
	76	}
	77
	78	/* check if this resource has been manually set, if so skip */
	79	if (!(dev->res.mem_resource[idx].flags & IORESOURCE_AUTO))
	80	return 1;
	81
	82	start = &dev->res.mem_resource[idx].start;
	83	end = &dev->res.mem_resource[idx].end;
	84	flags = &dev->res.mem_resource[idx].flags;
	85
	86	/* set the initial values */
	87	*flags \|= rule->flags \| IORESOURCE_MEM;
	88	*flags &= ~IORESOURCE_UNSET;
	89
	90	/* convert pnp flags to standard Linux flags */
	91	if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
	92	*flags \|= IORESOURCE_READONLY;
	93	if (rule->flags & IORESOURCE_MEM_CACHEABLE)
	94	*flags \|= IORESOURCE_CACHEABLE;
	95	if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
	96	*flags \|= IORESOURCE_RANGELENGTH;
	97	if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
	98	*flags \|= IORESOURCE_SHADOWABLE;
	99
	100	if (!rule->size) {
	101	*flags \|= IORESOURCE_DISABLED;
	102	return 1; /* skip disabled resource requests */
	103	}
	104
	105	*start = rule->min;
	106	end = start + rule->size -1;
	107
	108	/* run through until pnp_check_mem is happy */
	109	while (!pnp_check_mem(dev, idx)) {
	110	*start += rule->align;
	111	end = start + rule->size - 1;
	112	if (*start > rule->max \|\| !rule->align)
	113	return 0;
	114	}
	115	return 1;
	116	}
	117
	118	static int pnp_assign_irq(struct pnp_dev * dev, struct pnp_irq *rule, int idx)
	119	{
b60ba834 GKH	120	resource_size_t start, end;
b60ba834 GKH	121	unsigned long *flags;
1da177e4 LT	122	int i;
	123
	124	/* IRQ priority: this table is good for i386 */
	125	static unsigned short xtab[16] = {
	126	5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
	127	};
	128
	129	if (!dev \|\| !rule)
	130	return -EINVAL;
	131
	132	if (idx >= PNP_MAX_IRQ) {
	133	pnp_err("More than 2 irqs is incompatible with pnp specifications.");
	134	/* pretend we were successful so at least the manager won't try again */
	135	return 1;
	136	}
	137
	138	/* check if this resource has been manually set, if so skip */
	139	if (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO))
	140	return 1;
	141
	142	start = &dev->res.irq_resource[idx].start;
	143	end = &dev->res.irq_resource[idx].end;
	144	flags = &dev->res.irq_resource[idx].flags;
	145
	146	/* set the initial values */
	147	*flags \|= rule->flags \| IORESOURCE_IRQ;
	148	*flags &= ~IORESOURCE_UNSET;
	149
	150	if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
	151	*flags \|= IORESOURCE_DISABLED;
	152	return 1; /* skip disabled resource requests */
	153	}
	154
	155	/* TBD: need check for >16 IRQ */
	156	*start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
	157	if (*start < PNP_IRQ_NR) {
	158	end = start;
	159	return 1;
	160	}
	161	for (i = 0; i < 16; i++) {
	162	if(test_bit(xtab[i], rule->map)) {
	163	start = end = xtab[i];
	164	if(pnp_check_irq(dev, idx))
	165	return 1;
	166	}
	167	}
	168	return 0;
	169	}
	170
	171	static int pnp_assign_dma(struct pnp_dev dev, struct pnp_dma rule, int idx)
	172	{
b60ba834 GKH	173	resource_size_t start, end;
b60ba834 GKH	174	unsigned long *flags;
1da177e4 LT	175	int i;
	176
	177	/* DMA priority: this table is good for i386 */
	178	static unsigned short xtab[8] = {
	179	1, 3, 5, 6, 7, 0, 2, 4
	180	};
	181
	182	if (!dev \|\| !rule)
	183	return -EINVAL;
	184
	185	if (idx >= PNP_MAX_DMA) {
	186	pnp_err("More than 2 dmas is incompatible with pnp specifications.");
	187	/* pretend we were successful so at least the manager won't try again */
	188	return 1;
	189	}
	190
	191	/* check if this resource has been manually set, if so skip */
	192	if (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO))
	193	return 1;
	194
	195	start = &dev->res.dma_resource[idx].start;
	196	end = &dev->res.dma_resource[idx].end;
	197	flags = &dev->res.dma_resource[idx].flags;
	198
	199	/* set the initial values */
	200	*flags \|= rule->flags \| IORESOURCE_DMA;
	201	*flags &= ~IORESOURCE_UNSET;
	202
	203	if (!rule->map) {
	204	*flags \|= IORESOURCE_DISABLED;
	205	return 1; /* skip disabled resource requests */
	206	}
	207
	208	for (i = 0; i < 8; i++) {
	209	if(rule->map & (1<<xtab[i])) {
	210	start = end = xtab[i];
	211	if(pnp_check_dma(dev, idx))
	212	return 1;
	213	}
	214	}
	215	return 0;
	216	}
	217
	218	/**
	219	* pnp_init_resources - Resets a resource table to default values.
	220	* @table: pointer to the desired resource table
	221	*
	222	*/
	223	void pnp_init_resource_table(struct pnp_resource_table *table)
	224	{
	225	int idx;
	226	for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
	227	table->irq_resource[idx].name = NULL;
	228	table->irq_resource[idx].start = -1;
	229	table->irq_resource[idx].end = -1;
	230	table->irq_resource[idx].flags = IORESOURCE_IRQ \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	231	}
	232	for (idx = 0; idx < PNP_MAX_DMA; idx++) {
	233	table->dma_resource[idx].name = NULL;
	234	table->dma_resource[idx].start = -1;
	235	table->dma_resource[idx].end = -1;
	236	table->dma_resource[idx].flags = IORESOURCE_DMA \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	237	}
	238	for (idx = 0; idx < PNP_MAX_PORT; idx++) {
239	table->port_resource[idx].name = NULL;
240	table->port_resource[idx].start = 0;
241	table->port_resource[idx].end = 0;
242	table->port_resource[idx].flags = IORESOURCE_IO \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
243	}
244	for (idx = 0; idx < PNP_MAX_MEM; idx++) {
245	table->mem_resource[idx].name = NULL;
246	table->mem_resource[idx].start = 0;
247	table->mem_resource[idx].end = 0;
248	table->mem_resource[idx].flags = IORESOURCE_MEM \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
249	}
250	}
251
252	/**
253	* pnp_clean_resources - clears resources that were not manually set
67be2dd1	254	* @res: the resources to clean
1da177e4 LT	255	*
	256	*/
	257	static void pnp_clean_resource_table(struct pnp_resource_table * res)
	258	{
	259	int idx;
	260	for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
	261	if (!(res->irq_resource[idx].flags & IORESOURCE_AUTO))
	262	continue;
	263	res->irq_resource[idx].start = -1;
	264	res->irq_resource[idx].end = -1;
	265	res->irq_resource[idx].flags = IORESOURCE_IRQ \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	266	}
	267	for (idx = 0; idx < PNP_MAX_DMA; idx++) {
	268	if (!(res->dma_resource[idx].flags & IORESOURCE_AUTO))
	269	continue;
	270	res->dma_resource[idx].start = -1;
	271	res->dma_resource[idx].end = -1;
	272	res->dma_resource[idx].flags = IORESOURCE_DMA \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	273	}
	274	for (idx = 0; idx < PNP_MAX_PORT; idx++) {
	275	if (!(res->port_resource[idx].flags & IORESOURCE_AUTO))
	276	continue;
	277	res->port_resource[idx].start = 0;
	278	res->port_resource[idx].end = 0;
	279	res->port_resource[idx].flags = IORESOURCE_IO \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	280	}
	281	for (idx = 0; idx < PNP_MAX_MEM; idx++) {
	282	if (!(res->mem_resource[idx].flags & IORESOURCE_AUTO))
	283	continue;
	284	res->mem_resource[idx].start = 0;
	285	res->mem_resource[idx].end = 0;
	286	res->mem_resource[idx].flags = IORESOURCE_MEM \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	287	}
	288	}
	289
	290	/**
	291	* pnp_assign_resources - assigns resources to the device based on the specified dependent number
	292	* @dev: pointer to the desired device
	293	* @depnum: the dependent function number
	294	*
	295	* Only set depnum to 0 if the device does not have dependent options.
	296	*/
	297	static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
	298	{
	299	struct pnp_port *port;
	300	struct pnp_mem *mem;
	301	struct pnp_irq *irq;
	302	struct pnp_dma *dma;
	303	int nport = 0, nmem = 0, nirq = 0, ndma = 0;
	304
	305	if (!pnp_can_configure(dev))
	306	return -ENODEV;
	307
	308	down(&pnp_res_mutex);
	309	pnp_clean_resource_table(&dev->res); /* start with a fresh slate */
	310	if (dev->independent) {
	311	port = dev->independent->port;
	312	mem = dev->independent->mem;
	313	irq = dev->independent->irq;
	314	dma = dev->independent->dma;
	315	while (port) {
	316	if (!pnp_assign_port(dev, port, nport))
	317	goto fail;
	318	nport++;
319	port = port->next;
320	}
321	while (mem) {
322	if (!pnp_assign_mem(dev, mem, nmem))
323	goto fail;
324	nmem++;
325	mem = mem->next;
326	}
327	while (irq) {
328	if (!pnp_assign_irq(dev, irq, nirq))
329	goto fail;
330	nirq++;
331	irq = irq->next;
332	}
333	while (dma) {
334	if (!pnp_assign_dma(dev, dma, ndma))
335	goto fail;
336	ndma++;
337	dma = dma->next;
338	}
339	}
340
341	if (depnum) {
342	struct pnp_option *dep;
343	int i;
344	for (i=1,dep=dev->dependent; i<depnum; i++, dep=dep->next)
345	if(!dep)
346	goto fail;
347	port =dep->port;
348	mem = dep->mem;
349	irq = dep->irq;
350	dma = dep->dma;
351	while (port) {
352	if (!pnp_assign_port(dev, port, nport))
353	goto fail;
354	nport++;
355	port = port->next;
356	}
357	while (mem) {
358	if (!pnp_assign_mem(dev, mem, nmem))
359	goto fail;
360	nmem++;
361	mem = mem->next;
362	}
363	while (irq) {
364	if (!pnp_assign_irq(dev, irq, nirq))
365	goto fail;
366	nirq++;
367	irq = irq->next;
368	}
369	while (dma) {
370	if (!pnp_assign_dma(dev, dma, ndma))
371	goto fail;
372	ndma++;
373	dma = dma->next;
374	}
375	} else if (dev->dependent)
376	goto fail;
377
378	up(&pnp_res_mutex);
379	return 1;
380
381	fail:
382	pnp_clean_resource_table(&dev->res);
383	up(&pnp_res_mutex);
384	return 0;
385	}
386
387	/**
388	* pnp_manual_config_dev - Disables Auto Config and Manually sets the resource table
389	* @dev: pointer to the desired device
390	* @res: pointer to the new resource config
3d41088f	391	* @mode: 0 or PNP_CONFIG_FORCE
1da177e4 LT	392	*
	393	* This function can be used by drivers that want to manually set thier resources.
	394	*/
	395	int pnp_manual_config_dev(struct pnp_dev dev, struct pnp_resource_table res, int mode)
	396	{
	397	int i;
	398	struct pnp_resource_table * bak;
	399	if (!dev \|\| !res)
	400	return -EINVAL;
	401	if (!pnp_can_configure(dev))
	402	return -ENODEV;
	403	bak = pnp_alloc(sizeof(struct pnp_resource_table));
	404	if (!bak)
	405	return -ENOMEM;
	406	*bak = dev->res;
	407
	408	down(&pnp_res_mutex);
	409	dev->res = *res;
	410	if (!(mode & PNP_CONFIG_FORCE)) {
	411	for (i = 0; i < PNP_MAX_PORT; i++) {
	412	if(!pnp_check_port(dev,i))
	413	goto fail;
	414	}
	415	for (i = 0; i < PNP_MAX_MEM; i++) {
	416	if(!pnp_check_mem(dev,i))
	417	goto fail;
	418	}
	419	for (i = 0; i < PNP_MAX_IRQ; i++) {
	420	if(!pnp_check_irq(dev,i))
	421	goto fail;
	422	}
	423	for (i = 0; i < PNP_MAX_DMA; i++) {
	424	if(!pnp_check_dma(dev,i))
	425	goto fail;
	426	}
	427	}
	428	up(&pnp_res_mutex);
	429
	430	kfree(bak);
	431	return 0;
	432
	433	fail:
	434	dev->res = *bak;
	435	up(&pnp_res_mutex);
	436	kfree(bak);
	437	return -EINVAL;
	438	}
	439
	440	/**
	441	* pnp_auto_config_dev - automatically assigns resources to a device
	442	* @dev: pointer to the desired device
	443	*
	444	*/
	445	int pnp_auto_config_dev(struct pnp_dev *dev)
	446	{
	447	struct pnp_option *dep;
	448	int i = 1;
	449
	450	if(!dev)
	451	return -EINVAL;
	452
	453	if(!pnp_can_configure(dev)) {
	454	pnp_info("Device %s does not support resource configuration.", dev->dev.bus_id);
	455	return -ENODEV;
456	}
457
458	if (!dev->dependent) {
459	if (pnp_assign_resources(dev, 0))
460	return 0;
461	} else {
462	dep = dev->dependent;
463	do {
464	if (pnp_assign_resources(dev, i))
465	return 0;
466	dep = dep->next;
467	i++;
468	} while (dep);
469	}
470
471	pnp_err("Unable to assign resources to device %s.", dev->dev.bus_id);
472	return -EBUSY;
473	}
474
68094e32 PO	475	/**
	476	* pnp_start_dev - low-level start of the PnP device
	477	* @dev: pointer to the desired device
	478	*
	479	* assumes that resources have alread been allocated
	480	*/
	481
	482	int pnp_start_dev(struct pnp_dev *dev)
	483	{
	484	if (!pnp_can_write(dev)) {
c640be26	485	pnp_info("Device %s does not support activation.", dev->dev.bus_id);
68094e32 PO	486	return -EINVAL;
	487	}
	488
	489	if (dev->protocol->set(dev, &dev->res)<0) {
	490	pnp_err("Failed to activate device %s.", dev->dev.bus_id);
	491	return -EIO;
	492	}
	493
	494	pnp_info("Device %s activated.", dev->dev.bus_id);
	495
	496	return 0;
	497	}
	498
	499	/**
	500	* pnp_stop_dev - low-level disable of the PnP device
	501	* @dev: pointer to the desired device
	502	*
	503	* does not free resources
	504	*/
	505
	506	int pnp_stop_dev(struct pnp_dev *dev)
	507	{
	508	if (!pnp_can_disable(dev)) {
c640be26	509	pnp_info("Device %s does not support disabling.", dev->dev.bus_id);
68094e32 PO	510	return -EINVAL;
	511	}
	512	if (dev->protocol->disable(dev)<0) {
	513	pnp_err("Failed to disable device %s.", dev->dev.bus_id);
	514	return -EIO;
	515	}
	516
	517	pnp_info("Device %s disabled.", dev->dev.bus_id);
	518
	519	return 0;
	520	}
	521
1da177e4 LT	522	/**
	523	* pnp_activate_dev - activates a PnP device for use
	524	* @dev: pointer to the desired device
	525	*
	526	* does not validate or set resources so be careful.
	527	*/
	528	int pnp_activate_dev(struct pnp_dev *dev)
	529	{
68094e32 PO	530	int error;
68094e32 PO	531
1da177e4 LT	532	if (!dev)
	533	return -EINVAL;
	534	if (dev->active) {
	535	return 0; /* the device is already active */
	536	}
	537
	538	/* ensure resources are allocated */
	539	if (pnp_auto_config_dev(dev))
	540	return -EBUSY;
	541
68094e32 PO	542	error = pnp_start_dev(dev);
	543	if (error)
	544	return error;
1da177e4 LT	545
1da177e4 LT	546	dev->active = 1;
1da177e4 LT	547
	548	return 1;
	549	}
	550
	551	/**
	552	* pnp_disable_dev - disables device
	553	* @dev: pointer to the desired device
	554	*
	555	* inform the correct pnp protocol so that resources can be used by other devices
	556	*/
	557	int pnp_disable_dev(struct pnp_dev *dev)
	558	{
68094e32 PO	559	int error;
68094e32 PO	560
1da177e4 LT	561	if (!dev)
	562	return -EINVAL;
	563	if (!dev->active) {
	564	return 0; /* the device is already disabled */
	565	}
	566
68094e32 PO	567	error = pnp_stop_dev(dev);
	568	if (error)
	569	return error;
1da177e4 LT	570
1da177e4 LT	571	dev->active = 0;
1da177e4 LT	572
	573	/* release the resources so that other devices can use them */
	574	down(&pnp_res_mutex);
	575	pnp_clean_resource_table(&dev->res);
	576	up(&pnp_res_mutex);
	577
	578	return 1;
	579	}
	580
	581	/**
	582	* pnp_resource_change - change one resource
	583	* @resource: pointer to resource to be changed
	584	* @start: start of region
	585	* @size: size of region
	586	*
	587	*/
b60ba834 GKH	588	void pnp_resource_change(struct resource *resource, resource_size_t start,
b60ba834 GKH	589	resource_size_t size)
1da177e4 LT	590	{
	591	if (resource == NULL)
	592	return;
	593	resource->flags &= ~(IORESOURCE_AUTO \| IORESOURCE_UNSET);
	594	resource->start = start;
	595	resource->end = start + size - 1;
	596	}
	597
	598
	599	EXPORT_SYMBOL(pnp_manual_config_dev);
b449f63c	600	#if 0
1da177e4	601	EXPORT_SYMBOL(pnp_auto_config_dev);
b449f63c	602	#endif
68094e32 PO	603	EXPORT_SYMBOL(pnp_start_dev);
68094e32 PO	604	EXPORT_SYMBOL(pnp_stop_dev);
1da177e4 LT	605	EXPORT_SYMBOL(pnp_activate_dev);
	606	EXPORT_SYMBOL(pnp_disable_dev);
	607	EXPORT_SYMBOL(pnp_resource_change);
	608	EXPORT_SYMBOL(pnp_init_resource_table);