[mirror_ubuntu-bionic-kernel.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/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
49b1153a DB	19	#include <pcmcia/ss.h>
	20	#include <pcmcia/cs.h>
	21	#include <pcmcia/cistpl.h>
	22	#include "cs_internal.h"
	23
	24
	25	struct pcmcia_align_data {
	26	unsigned long mask;
	27	unsigned long offset;
	28	};
	29
	30	static resource_size_t pcmcia_align(void *align_data,
	31	const struct resource *res,
	32	resource_size_t size, resource_size_t align)
	33	{
	34	struct pcmcia_align_data *data = align_data;
	35	resource_size_t start;
	36
	37	start = (res->start & ~data->mask) + data->offset;
	38	if (start < res->start)
	39	start += data->mask + 1;
	40
	41	#ifdef CONFIG_X86
	42	if (res->flags & IORESOURCE_IO) {
	43	if (start & 0x300)
	44	start = (start + 0x3ff) & ~0x3ff;
	45	}
	46	#endif
	47
	48	#ifdef CONFIG_M68K
	49	if (res->flags & IORESOURCE_IO) {
	50	if ((res->start + size - 1) >= 1024)
	51	start = res->end;
	52	}
	53	#endif
	54
	55	return start;
	56	}
	57
	58
b19a7275 DB	59	static struct resource __iodyn_find_io_region(struct pcmcia_socket s,
	60	unsigned long base, int num,
	61	unsigned long align)
49b1153a DB	62	{
	63	struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_IO,
	64	dev_name(&s->dev));
	65	struct pcmcia_align_data data;
	66	unsigned long min = base;
	67	int ret;
	68
49b1153a DB	69	data.mask = align - 1;
	70	data.offset = base & data.mask;
	71
	72	#ifdef CONFIG_PCI
	73	if (s->cb_dev) {
	74	ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
	75	min, 0, pcmcia_align, &data);
	76	} else
	77	#endif
	78	ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
	79	1, pcmcia_align, &data);
	80
	81	if (ret != 0) {
	82	kfree(res);
	83	res = NULL;
	84	}
	85	return res;
	86	}
	87
b19a7275 DB	88	static int iodyn_find_io(struct pcmcia_socket *s, unsigned int attr,
	89	unsigned int *base, unsigned int num,
	90	unsigned int align)
	91	{
	92	int i, ret = 0;
	93
	94	/* Check for an already-allocated window that must conflict with
	95	* what was asked for. It is a hack because it does not catch all
	96	* potential conflicts, just the most obvious ones.
	97	*/
	98	for (i = 0; i < MAX_IO_WIN; i++) {
	99	if (!s->io[i].res)
	100	continue;
	101
	102	if (!*base)
	103	continue;
	104
	105	if ((s->io[i].res->start & (align-1)) == *base)
	106	return -EBUSY;
	107	}
	108
	109	for (i = 0; i < MAX_IO_WIN; i++) {
	110	struct resource *res = s->io[i].res;
	111	unsigned int try;
	112
	113	if (res && (res->flags & IORESOURCE_BITS) !=
	114	(attr & IORESOURCE_BITS))
	115	continue;
	116
	117	if (!res) {
	118	if (align == 0)
	119	align = 0x10000;
	120
	121	res = s->io[i].res = __iodyn_find_io_region(s, *base,
	122	num, align);
	123	if (!res)
	124	return -EINVAL;
	125
	126	*base = res->start;
	127	s->io[i].res->flags =
	128	((res->flags & ~IORESOURCE_BITS) \|
	129	(attr & IORESOURCE_BITS));
	130	s->io[i].InUse = num;
	131	return 0;
	132	}
	133
	134	/* Try to extend top of window */
	135	try = res->end + 1;
	136	if ((base == 0) \|\| (base == try)) {
	137	if (adjust_resource(s->io[i].res, res->start,
	138	res->end - res->start + num + 1))
	139	continue;
	140	*base = try;
	141	s->io[i].InUse += num;
	142	return 0;
	143	}
	144
	145	/* Try to extend bottom of window */
	146	try = res->start - num;
	147	if ((base == 0) \|\| (base == try)) {
	148	if (adjust_resource(s->io[i].res,
	149	res->start - num,
	150	res->end - res->start + num + 1))
	151	continue;
152	*base = try;
153	s->io[i].InUse += num;
154	return 0;
155	}
156	}
157
158	return -EINVAL;
159	}
160
161
49b1153a DB	162	struct pccard_resource_ops pccard_iodyn_ops = {
49b1153a DB	163	.validate_mem = NULL,
b19a7275	164	.find_io = iodyn_find_io,
49b1153a	165	.find_mem = NULL,
49b1153a DB	166	.init = static_init,
	167	.exit = NULL,
	168	};
	169	EXPORT_SYMBOL(pccard_iodyn_ops);