171 lines
3.7 KiB
C
171 lines
3.7 KiB
C
/*
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* rsrc_iodyn.c -- Resource management routines for MEM-static sockets.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* The initial developer of the original code is David A. Hinds
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* <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
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* are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
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*
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* (C) 1999 David A. Hinds
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <pcmcia/cs_types.h>
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#include <pcmcia/ss.h>
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#include <pcmcia/cs.h>
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#include <pcmcia/cistpl.h>
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#include "cs_internal.h"
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struct pcmcia_align_data {
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unsigned long mask;
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unsigned long offset;
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};
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static resource_size_t pcmcia_align(void *align_data,
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const struct resource *res,
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resource_size_t size, resource_size_t align)
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{
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struct pcmcia_align_data *data = align_data;
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resource_size_t start;
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start = (res->start & ~data->mask) + data->offset;
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if (start < res->start)
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start += data->mask + 1;
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#ifdef CONFIG_X86
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if (res->flags & IORESOURCE_IO) {
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if (start & 0x300)
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start = (start + 0x3ff) & ~0x3ff;
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}
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#endif
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#ifdef CONFIG_M68K
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if (res->flags & IORESOURCE_IO) {
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if ((res->start + size - 1) >= 1024)
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start = res->end;
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}
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#endif
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return start;
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}
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static struct resource *__iodyn_find_io_region(struct pcmcia_socket *s,
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unsigned long base, int num,
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unsigned long align)
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{
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struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_IO,
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dev_name(&s->dev));
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struct pcmcia_align_data data;
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unsigned long min = base;
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int ret;
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data.mask = align - 1;
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data.offset = base & data.mask;
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#ifdef CONFIG_PCI
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if (s->cb_dev) {
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ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
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min, 0, pcmcia_align, &data);
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} else
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#endif
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ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
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1, pcmcia_align, &data);
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if (ret != 0) {
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kfree(res);
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res = NULL;
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}
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return res;
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}
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static int iodyn_find_io(struct pcmcia_socket *s, unsigned int attr,
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unsigned int *base, unsigned int num,
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unsigned int align)
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{
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int i, ret = 0;
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/* Check for an already-allocated window that must conflict with
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* what was asked for. It is a hack because it does not catch all
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* potential conflicts, just the most obvious ones.
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*/
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for (i = 0; i < MAX_IO_WIN; i++) {
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if (!s->io[i].res)
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continue;
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if (!*base)
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continue;
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if ((s->io[i].res->start & (align-1)) == *base)
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return -EBUSY;
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}
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for (i = 0; i < MAX_IO_WIN; i++) {
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struct resource *res = s->io[i].res;
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unsigned int try;
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if (res && (res->flags & IORESOURCE_BITS) !=
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(attr & IORESOURCE_BITS))
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continue;
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if (!res) {
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if (align == 0)
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align = 0x10000;
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res = s->io[i].res = __iodyn_find_io_region(s, *base,
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num, align);
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if (!res)
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return -EINVAL;
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*base = res->start;
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s->io[i].res->flags =
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((res->flags & ~IORESOURCE_BITS) |
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(attr & IORESOURCE_BITS));
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s->io[i].InUse = num;
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return 0;
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}
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/* Try to extend top of window */
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try = res->end + 1;
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if ((*base == 0) || (*base == try)) {
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if (adjust_resource(s->io[i].res, res->start,
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res->end - res->start + num + 1))
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continue;
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*base = try;
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s->io[i].InUse += num;
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return 0;
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}
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/* Try to extend bottom of window */
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try = res->start - num;
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if ((*base == 0) || (*base == try)) {
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if (adjust_resource(s->io[i].res,
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res->start - num,
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res->end - res->start + num + 1))
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continue;
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*base = try;
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s->io[i].InUse += num;
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return 0;
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}
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}
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return -EINVAL;
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}
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struct pccard_resource_ops pccard_iodyn_ops = {
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.validate_mem = NULL,
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.find_io = iodyn_find_io,
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.find_mem = NULL,
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.init = static_init,
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.exit = NULL,
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};
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EXPORT_SYMBOL(pccard_iodyn_ops);
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