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/cs.h>
  21 #include <pcmcia/cistpl.h>
  22 #include "cs_internal.h"
  23
  24
  25 struct pcmcia_align_data {
  26         unsigned long   mask;
  27         unsigned long   offset;
  28 };
  29
  30 static resource_size_t pcmcia_align(void *align_data,
  31                                 const struct resource *res,
  32                                 resource_size_t size, resource_size_t align)
  33 {
  34         struct pcmcia_align_data *data = align_data;
  35         resource_size_t start;
  36
  37         start = (res->start & ~data->mask) + data->offset;
  38         if (start < res->start)
  39                 start += data->mask + 1;
  40
  41 #ifdef CONFIG_X86
  42         if (res->flags & IORESOURCE_IO) {
  43                 if (start & 0x300)
  44                         start = (start + 0x3ff) & ~0x3ff;
  45         }
  46 #endif
  47
  48 #ifdef CONFIG_M68K
  49         if (res->flags & IORESOURCE_IO) {
  50                 if ((res->start + size - 1) >= 1024)
  51                         start = res->end;
  52         }
  53 #endif
  54
  55         return start;
  56 }
  57
  58
  59 static struct resource *__iodyn_find_io_region(struct pcmcia_socket *s,
  60                                         unsigned long base, int num,
  61                                         unsigned long align)
  62 {
  63         struct resource *res = pcmcia_make_resource(0, num, IORESOURCE_IO,
  64                                                 dev_name(&s->dev));
  65         struct pcmcia_align_data data;
  66         unsigned long min = base;
  67         int ret;
  68
  69         data.mask = align - 1;
  70         data.offset = base & data.mask;
  71
  72 #ifdef CONFIG_PCI
  73         if (s->cb_dev) {
  74                 ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
  75                                              min, 0, pcmcia_align, &data);
  76         } else
  77 #endif
  78                 ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
  79                                         1, pcmcia_align, &data);
  80
  81         if (ret != 0) {
  82                 kfree(res);
  83                 res = NULL;
  84         }
  85         return res;
  86 }
  87
  88 static int iodyn_find_io(struct pcmcia_socket *s, unsigned int attr,
  89                         unsigned int *base, unsigned int num,
  90                         unsigned int align, struct resource **parent)
  91 {
  92         int i, ret = 0;
  93
  94         /* Check for an already-allocated window that must conflict with
  95          * what was asked for.  It is a hack because it does not catch all
  96          * potential conflicts, just the most obvious ones.
  97          */
  98         for (i = 0; i < MAX_IO_WIN; i++) {
  99                 if (!s->io[i].res)
 100                         continue;
 101
 102                 if (!*base)
 103                         continue;
 104
 105                 if ((s->io[i].res->start & (align-1)) == *base)
 106                         return -EBUSY;
 107         }
 108
 109         for (i = 0; i < MAX_IO_WIN; i++) {
 110                 struct resource *res = s->io[i].res;
 111                 unsigned int try;
 112
 113                 if (res && (res->flags & IORESOURCE_BITS) !=
 114                         (attr & IORESOURCE_BITS))
 115                         continue;
 116
 117                 if (!res) {
 118                         if (align == 0)
 119                                 align = 0x10000;
 120
 121                         res = s->io[i].res = __iodyn_find_io_region(s, *base,
 122                                                                 num, align);
 123                         if (!res)
 124                                 return -EINVAL;
 125
 126                         *base = res->start;
 127                         s->io[i].res->flags =
 128                                 ((res->flags & ~IORESOURCE_BITS) |
 129                                         (attr & IORESOURCE_BITS));
 130                         s->io[i].InUse = num;
 131                         *parent = res;
 132                         return 0;
 133                 }
 134
 135                 /* Try to extend top of window */
 136                 try = res->end + 1;
 137                 if ((*base == 0) || (*base == try)) {
 138                         if (adjust_resource(s->io[i].res, res->start,
 139                                         res->end - res->start + num + 1))
 140                                 continue;
 141                         *base = try;
 142                         s->io[i].InUse += num;
 143                         *parent = res;
 144                         return 0;
 145                 }
 146
 147                 /* Try to extend bottom of window */
 148                 try = res->start - num;
 149                 if ((*base == 0) || (*base == try)) {
 150                         if (adjust_resource(s->io[i].res,
 151                                         res->start - num,
 152                                         res->end - res->start + num + 1))
 153                                 continue;
 154                         *base = try;
 155                         s->io[i].InUse += num;
 156                         *parent = res;
 157                         return 0;
 158                 }
 159         }
 160
 161         return -EINVAL;
 162 }
 163
 164
 165 struct pccard_resource_ops pccard_iodyn_ops = {
 166         .validate_mem = NULL,
 167         .find_io = iodyn_find_io,
 168         .find_mem = NULL,
 169         .init = static_init,
 170         .exit = NULL,
 171 };
 172 EXPORT_SYMBOL(pccard_iodyn_ops);