linux/drivers/pcmcia/rsrc_iodyn.c
Dominik Brodowski ad0c7be28b pcmcia: insert PCMCIA device resources into resource tree
Insert PCMCIA device resources into the resource tree. However, this is
currently only implemented for sockets which do not statically map the
resources.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2010-08-03 09:04:19 +02:00

173 lines
3.8 KiB
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, 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,
res->end - res->start + num + 1))
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,
res->end - res->start + num + 1))
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);