rsrc_iodyn.c
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/*
* 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/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, struct resource **parent)
{
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;
*parent = res;
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,
resource_size(res) + num))
continue;
*base = try;
s->io[i].InUse += num;
*parent = res;
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,
resource_size(res) + num))
continue;
*base = try;
s->io[i].InUse += num;
*parent = res;
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);