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