path: root/drivers/pcmcia/pcmcia_resource.c

/*
 * PCMCIA 16-bit resource management functions
 *
 * 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.
 *
 * Copyright (C) 1999	     David A. Hinds
 * Copyright (C) 2004-2010   Dominik Brodowski
 *
 * 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.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/slab.h>

#include <asm/irq.h>

#include <pcmcia/ss.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ds.h>

#include "cs_internal.h"


/* Access speed for IO windows */
static int io_speed;
module_param(io_speed, int, 0444);


int pcmcia_validate_mem(struct pcmcia_socket *s)
{
	if (s->resource_ops->validate_mem)
		return s->resource_ops->validate_mem(s);
	/* if there is no callback, we can assume that everything is OK */
	return 0;
}

struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
				 int low, struct pcmcia_socket *s)
{
	if (s->resource_ops->find_mem)
		return s->resource_ops->find_mem(base, num, align, low, s);
	return NULL;
}


/**
 * release_io_space() - release IO ports allocated with alloc_io_space()
 * @s: pcmcia socket
 * @res: resource to release
 *
 */
static void release_io_space(struct pcmcia_socket *s, struct resource *res)
{
	resource_size_t num = resource_size(res);
	int i;

	dev_dbg(&s->dev, "release_io_space for %pR\n", res);

	for (i = 0; i < MAX_IO_WIN; i++) {
		if (!s->io[i].res)
			continue;
		if ((s->io[i].res->start <= res->start) &&
		    (s->io[i].res->end >= res->end)) {
			s->io[i].InUse -= num;
			if (res->parent)
				release_resource(res);
			res->start = res->end = 0;
			res->flags = IORESOURCE_IO;
			/* Free the window if no one else is using it */
			if (s->io[i].InUse == 0) {
				release_resource(s->io[i].res);
				kfree(s->io[i].res);
				s->io[i].res = NULL;
			}
		}
	}
}


/**
 * alloc_io_space() - allocate IO ports for use by a PCMCIA device
 * @s: pcmcia socket
 * @res: resource to allocate (begin: begin, end: size)
 * @lines: number of IO lines decoded by the PCMCIA card
 *
 * Special stuff for managing IO windows, because they are scarce
 */
static int alloc_io_space(struct pcmcia_socket *s, struct resource *res,
			unsigned int lines)
{
	unsigned int align;
	unsigned int base = res->start;
	unsigned int num = res->end;
	int ret;

	res->flags |= IORESOURCE_IO;

	dev_dbg(&s->dev, "alloc_io_space request for %pR, %d lines\n",
		res, lines);

	align = base ? (lines ? 1<<lines : 0) : 1;
	if (align && (align < num)) {
		if (base) {
			dev_dbg(&s->dev, "odd IO request\n");
			align = 0;
		} else
			while (align && (align < num))
				align <<= 1;
	}
	if (base & ~(align-1)) {
		dev_dbg(&s->dev, "odd IO request\n");
		align = 0;
	}

	ret = s->resource_ops->find_io(s, res->flags, &base, num, align,
				&res->parent);
	if (ret) {
		dev_dbg(&s->dev, "alloc_io_space request failed (%d)\n", ret);
		return -EINVAL;
	}

	res->start = base;
	res->end = res->start + num - 1;

	if (res->parent) {
		ret = request_resource(res->parent, res);
		if (ret) {
			dev_warn(&s->dev,
				"request_resource %pR failed: %d\n", res,