[net-next-2.6.git] / drivers / pcmcia / rsrc_iodyn.c

/*
 * rsrc_iodyn.c -- Resource management routines for MEM-static 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/slab.h>
#include <linux/module.h>
#include <linux/kernel.h>

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


struct pcmcia_align_data {
	unsigned long	mask;
	unsigned long	offset;
};

static resource_size_t pcmcia_align(void *align_data,
				const struct resource *res,
				resource_size_t size, resource_size_t align)
{
	struct pcmcia_align_data *data = align_data;
	resource_size_t start;

	start = (res->start & ~data->mask) + data->offset;
	if (start < res->start)
		start += data->mask + 1;

#ifdef CONFIG_X86
	if (res->flags & IORESOURCE_IO) {
		if (start & 0x300)
			start = (start + 0x3ff) & ~0x3ff;
	}
#endif

#ifdef CONFIG_M68K
	if (res->flags & IORESOURCE_IO) {
		if ((res->start + size - 1) >= 1024)
			start = res->end;
	}
#endif

	return start;
}


static struct resource *__iodyn_find_io_region(struct pcmcia_socket *s,
					unsigned long base, int num,
					unsigned long align)
{
	struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_IO,
						dev_name(&s->dev));
	struct pcmcia_align_data data;
	unsigned long min = base;
	int ret;

	data.mask = align - 1;
	data.offset = base & data.mask;

#ifdef CONFIG_PCI
	if (s->cb_dev) {
		ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
					     min, 0, pcmcia_align, &data);
	} else
#endif
		ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
					1, pcmcia_align, &data);

	if (ret != 0) {
		kfree(res);
		res = NULL;
	}
	return res;
}

static int iodyn_find_io(struct pcmcia_socket *s, unsigned int attr,
			unsigned int *base, unsigned int num,
			unsigned int align)
{
	int i, ret = 0;

	/* Check for an already-allocated window that must conflict with
	 * what was asked for.  It is a hack because it does not catch all
	 * potential conflicts, just the most obvious ones.
	 */
	for (i = 0; i < MAX_IO_WIN; i++) {
		if (!s->io[i].res)
			continue;

		if (!*base)
			continue;

		if ((s->io[i].res->start & (align-1)) == *base)
			return -EBUSY;
	}

	for (i = 0; i < MAX_IO_WIN; i++) {
		struct resource *res = s->io[i].res;
		unsigned int try;

		if (res && (res->flags & IORESOURCE_BITS) !=
			(attr & IORESOURCE_BITS))
			continue;

		if (!res) {
			if (align == 0)
				align = 0x10000;

			res = s->io[i].res = __iodyn_find_io_region(s, *base,
								num, align);
			if (!res)
				return -EINVAL;

			*base = res->start;
			s->io[i].res->flags =
				((res->flags & ~IORESOURCE_BITS) |
					(attr & IORESOURCE_BITS));
			s->io[i].InUse = num;
			return 0;
		}

		/* Try to extend top of window */
		try = res->end + 1;
		if ((*base == 0) || (*base == try)) {
			if (adjust_resource(s->io[i].res, res->start,
					res->end - res->start + num + 1))
				continue;
			*base = try;
			s->io[i].InUse += num;
			return 0;
		}

		/* Try to extend bottom of window */
		try = res->start - num;
		if ((*base == 0) || (*base == try)) {
			if (adjust_resource(s->io[i].res,
					res->start - num,
					res->end - res->start + num + 1))
				continue;
			*base = try;
			s->io[i].InUse += num;
			return 0;
		}
	}

	return -EINVAL;
}


struct pccard_resource_ops pccard_iodyn_ops = {
	.validate_mem = NULL,
	.find_io = iodyn_find_io,
	.find_mem = NULL,
	.init = static_init,
	.exit = NULL,
};
EXPORT_SYMBOL(pccard_iodyn_ops);
Commit	Line	Data
49b1153a DB	1	/*
	2	* rsrc_iodyn.c -- Resource management routines for MEM-static sockets.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* The initial developer of the original code is David A. Hinds
	9	* <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
	10	* are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
	11	*
	12	* (C) 1999 David A. Hinds
	13	*/
	14
6d59622e	15	#include <linux/slab.h>
49b1153a DB	16	#include <linux/module.h>
	17	#include <linux/kernel.h>
	18
	19	#include <pcmcia/cs_types.h>
	20	#include <pcmcia/ss.h>
	21	#include <pcmcia/cs.h>
	22	#include <pcmcia/cistpl.h>
	23	#include "cs_internal.h"
	24
	25
	26	struct pcmcia_align_data {
	27	unsigned long mask;
	28	unsigned long offset;
	29	};
	30
	31	static resource_size_t pcmcia_align(void *align_data,
	32	const struct resource *res,
	33	resource_size_t size, resource_size_t align)
	34	{
	35	struct pcmcia_align_data *data = align_data;
	36	resource_size_t start;
	37
	38	start = (res->start & ~data->mask) + data->offset;
	39	if (start < res->start)
	40	start += data->mask + 1;
	41
	42	#ifdef CONFIG_X86
	43	if (res->flags & IORESOURCE_IO) {
	44	if (start & 0x300)
	45	start = (start + 0x3ff) & ~0x3ff;
	46	}
	47	#endif
	48
	49	#ifdef CONFIG_M68K
	50	if (res->flags & IORESOURCE_IO) {
	51	if ((res->start + size - 1) >= 1024)
	52	start = res->end;
	53	}
	54	#endif
	55
	56	return start;
	57	}
	58
	59
b19a7275 DB	60	static struct resource __iodyn_find_io_region(struct pcmcia_socket s,
	61	unsigned long base, int num,
	62	unsigned long align)
49b1153a DB	63	{
	64	struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_IO,
	65	dev_name(&s->dev));
	66	struct pcmcia_align_data data;
	67	unsigned long min = base;
	68	int ret;
	69
49b1153a DB	70	data.mask = align - 1;
	71	data.offset = base & data.mask;
	72
	73	#ifdef CONFIG_PCI
	74	if (s->cb_dev) {
	75	ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
	76	min, 0, pcmcia_align, &data);
	77	} else
	78	#endif
	79	ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
	80	1, pcmcia_align, &data);
	81
	82	if (ret != 0) {
	83	kfree(res);
	84	res = NULL;
	85	}
	86	return res;
	87	}
	88
b19a7275 DB	89	static int iodyn_find_io(struct pcmcia_socket *s, unsigned int attr,
	90	unsigned int *base, unsigned int num,
	91	unsigned int align)
	92	{
	93	int i, ret = 0;
	94
	95	/* Check for an already-allocated window that must conflict with
	96	* what was asked for. It is a hack because it does not catch all
	97	* potential conflicts, just the most obvious ones.
	98	*/
	99	for (i = 0; i < MAX_IO_WIN; i++) {
	100	if (!s->io[i].res)
	101	continue;
	102
	103	if (!*base)
	104	continue;
	105
	106	if ((s->io[i].res->start & (align-1)) == *base)
	107	return -EBUSY;
	108	}
	109
	110	for (i = 0; i < MAX_IO_WIN; i++) {
	111	struct resource *res = s->io[i].res;
	112	unsigned int try;
	113
	114	if (res && (res->flags & IORESOURCE_BITS) !=
	115	(attr & IORESOURCE_BITS))
	116	continue;
	117
	118	if (!res) {
	119	if (align == 0)
	120	align = 0x10000;
	121
	122	res = s->io[i].res = __iodyn_find_io_region(s, *base,
	123	num, align);
	124	if (!res)
	125	return -EINVAL;
	126
	127	*base = res->start;
	128	s->io[i].res->flags =
	129	((res->flags & ~IORESOURCE_BITS) \|
	130	(attr & IORESOURCE_BITS));
	131	s->io[i].InUse = num;
	132	return 0;
	133	}
	134
	135	/* Try to extend top of window */
	136	try = res->end + 1;
	137	if ((base == 0) \|\| (base == try)) {
	138	if (adjust_resource(s->io[i].res, res->start,
	139	res->end - res->start + num + 1))
	140	continue;
	141	*base = try;
	142	s->io[i].InUse += num;
	143	return 0;
	144	}
	145
	146	/* Try to extend bottom of window */
	147	try = res->start - num;
	148	if ((base == 0) \|\| (base == try)) {
	149	if (adjust_resource(s->io[i].res,
	150	res->start - num,
	151	res->end - res->start + num + 1))
	152	continue;
153	*base = try;
154	s->io[i].InUse += num;
155	return 0;
156	}
157	}
158
159	return -EINVAL;
160	}
161
162
49b1153a DB	163	struct pccard_resource_ops pccard_iodyn_ops = {
49b1153a DB	164	.validate_mem = NULL,
b19a7275	165	.find_io = iodyn_find_io,
49b1153a	166	.find_mem = NULL,
49b1153a DB	167	.init = static_init,
	168	.exit = NULL,
	169	};
	170	EXPORT_SYMBOL(pccard_iodyn_ops);