drivers/pcmcia/rsrc_iodyn.c

   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
  24 struct pcmcia_align_data {
  25         unsigned long   mask;
  26         unsigned long   offset;
  27 };
  28
  29 static 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
  58 static 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
  87 static 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
 164 struct 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 };
 171 EXPORT_SYMBOL(pccard_iodyn_ops);