linux/drivers/pcmcia/rsrc_iodyn.c
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   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
  15#include <linux/slab.h>
  16#include <linux/module.h>
  17#include <linux/kernel.h>
  18
  19#include <pcmcia/ss.h>
  20#include <pcmcia/cistpl.h>
  21#include "cs_internal.h"
  22
  23
  24struct pcmcia_align_data {
  25        unsigned long   mask;
  26        unsigned long   offset;
  27};
  28
  29static resource_size_t pcmcia_align(void *align_data,
  30                                const struct resource *res,
  31                                resource_size_t size, resource_size_t align)
  32{
  33        struct pcmcia_align_data *data = align_data;
  34        resource_size_t start;
  35
  36        start = (res->start & ~data->mask) + data->offset;
  37        if (start < res->start)
  38                start += data->mask + 1;
  39
  40#ifdef CONFIG_X86
  41        if (res->flags & IORESOURCE_IO) {
  42                if (start & 0x300)
  43                        start = (start + 0x3ff) & ~0x3ff;
  44        }
  45#endif
  46
  47#ifdef CONFIG_M68K
  48        if (res->flags & IORESOURCE_IO) {
  49                if ((res->start + size - 1) >= 1024)
  50                        start = res->end;
  51        }
  52#endif
  53
  54        return start;
  55}
  56
  57
  58static struct resource *__iodyn_find_io_region(struct pcmcia_socket *s,
  59                                        unsigned long base, int num,
  60                                        unsigned long align)
  61{
  62        struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_IO,
  63                                                dev_name(&s->dev));
  64        struct pcmcia_align_data data;
  65        unsigned long min = base;
  66        int ret;
  67
  68        data.mask = align - 1;
  69        data.offset = base & data.mask;
  70
  71#ifdef CONFIG_PCI
  72        if (s->cb_dev) {
  73                ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
  74                                             min, 0, pcmcia_align, &data);
  75        } else
  76#endif
  77                ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
  78                                        1, pcmcia_align, &data);
  79
  80        if (ret != 0) {
  81                kfree(res);
  82                res = NULL;
  83        }
  84        return res;
  85}
  86
  87static int iodyn_find_io(struct pcmcia_socket *s, unsigned int attr,
  88                        unsigned int *base, unsigned int num,
  89                        unsigned int align, struct resource **parent)
  90{
  91        int i, ret = 0;
  92
  93        /* Check for an already-allocated window that must conflict with
  94         * what was asked for.  It is a hack because it does not catch all
  95         * potential conflicts, just the most obvious ones.
  96         */
  97        for (i = 0; i < MAX_IO_WIN; i++) {
  98                if (!s->io[i].res)
  99                        continue;
 100
 101                if (!*base)
 102                        continue;
 103
 104                if ((s->io[i].res->start & (align-1)) == *base)
 105                        return -EBUSY;
 106        }
 107
 108        for (i = 0; i < MAX_IO_WIN; i++) {
 109                struct resource *res = s->io[i].res;
 110                unsigned int try;
 111
 112                if (res && (res->flags & IORESOURCE_BITS) !=
 113                        (attr & IORESOURCE_BITS))
 114                        continue;
 115
 116                if (!res) {
 117                        if (align == 0)
 118                                align = 0x10000;
 119
 120                        res = s->io[i].res = __iodyn_find_io_region(s, *base,
 121                                                                num, align);
 122                        if (!res)
 123                                return -EINVAL;
 124
 125                        *base = res->start;
 126                        s->io[i].res->flags =
 127                                ((res->flags & ~IORESOURCE_BITS) |
 128                                        (attr & IORESOURCE_BITS));
 129                        s->io[i].InUse = num;
 130                        *parent = res;
 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                                            resource_size(res) + num))
 139                                continue;
 140                        *base = try;
 141                        s->io[i].InUse += num;
 142                        *parent = res;
 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                                            resource_size(res) + num))
 152                                continue;
 153                        *base = try;
 154                        s->io[i].InUse += num;
 155                        *parent = res;
 156                        return 0;
 157                }
 158        }
 159
 160        return -EINVAL;
 161}
 162
 163
 164struct pccard_resource_ops pccard_iodyn_ops = {
 165        .validate_mem = NULL,
 166        .find_io = iodyn_find_io,
 167        .find_mem = NULL,
 168        .init = static_init,
 169        .exit = NULL,
 170};
 171EXPORT_SYMBOL(pccard_iodyn_ops);
 172
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