path: root/drivers/pcmcia/rsrc_nonstatic.c

/*
 * rsrc_nonstatic.c -- Resource management routines for !SS_CAP_STATIC_MAP sockets
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * The initial developer of the original code is David A. Hinds
 * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
 * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
 *
 * (C) 1999		David A. Hinds
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/timer.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <linux/io.h>

#include <asm/irq.h>

#include <pcmcia/cs_types.h>
#include <pcmcia/ss.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include "cs_internal.h"

MODULE_AUTHOR("David A. Hinds, Dominik Brodowski");
MODULE_LICENSE("GPL");

/* Parameters that can be set with 'insmod' */

#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)

INT_MODULE_PARM(probe_mem,	1);		/* memory probe? */
#ifdef CONFIG_PCMCIA_PROBE
INT_MODULE_PARM(probe_io,	1);		/* IO port probe? */
INT_MODULE_PARM(mem_limit,	0x10000);
#endif

/* for io_db and mem_db */
struct resource_map {
	u_long			base, num;
	struct resource_map	*next;
};

struct socket_data {
	struct resource_map		mem_db;
	struct resource_map		io_db;
	unsigned int			rsrc_mem_probe;
};

static DEFINE_MUTEX(rsrc_mutex);
#define MEM_PROBE_LOW	(1 << 0)
#define MEM_PROBE_HIGH	(1 << 1)


/*======================================================================

    Linux resource management extensions

======================================================================*/

static struct resource *
make_resource(resource_size_t b, resource_size_t n, int flags, const char *name)
{
	struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);

	if (res) {
		res->name = name;
		res->start = b;
		res->end = b + n - 1;
		res->flags = flags;
	}
	return res;
}

static struct resource *
claim_region(struct pcmcia_socket *s, resource_size_t base,
		resource_size_t size, int type, char *name)
{
	struct resource *res, *parent;

	parent = type & IORESOURCE_MEM ? &iomem_resource : &ioport_resource;
	res = make_resource(base, size, type | IORESOURCE_BUSY, name);

	if (res) {
#ifdef CONFIG_PCI
		if (s && s->cb_dev)
			parent = pci_find_parent_resource(s->cb_dev, res);
#endif
		if (!parent || request_resource(parent, res)) {
			kfree(res);
			res = NULL;
		}
	}
	return res;
}

static void free_region(struct resource *res)
{
	if (res) {
		release_resource(res);
		kfree(res);
	}
}

/*======================================================================

    These manage the internal databases of available resources.

======================================================================*/

static int add_interval(struct resource_map *map, u_long base, u_long num)
{
	struct resource_map *p, *q;

	for (p = map; ; p = p->next) {
		if ((p != map) && (p->base+p->num-1 >= base))
			return -1;
		if ((p->next == map) || (p->next->base > base+num-1))
			break;
	}
	q = kmalloc(sizeof(struct resource_map), GFP_KERNEL);
	if (!q) {
		printk(KERN_WARNING "out of memory to update resources\n");
		return -ENOMEM;
	}
	q->base = base; q->num = num;
	q->next = p->next; p->next = q;
	return 0;
}

/*====================================================================*/

static int sub_interval(struct resource_map *map, u_long base, u_long num)
{
	struct resource_