drivers/pcmcia/rsrc_mgr.c

   1 /*
   2  * rsrc_mgr.c -- Resource management routines and/or wrappers
   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/module.h>
  16 #include <linux/kernel.h>
  17
  18 #include <pcmcia/cs_types.h>
  19 #include <pcmcia/ss.h>
  20 #include <pcmcia/cs.h>
  21 #include <pcmcia/cistpl.h>
  22 #include "cs_internal.h"
  23
  24 static int static_init(struct pcmcia_socket *s)
  25 {
  26         /* the good thing about SS_CAP_STATIC_MAP sockets is
  27          * that they don't need a resource database */
  28
  29         s->resource_setup_done = 1;
  30
  31         return 0;
  32 }
  33
  34
  35 struct pccard_resource_ops pccard_static_ops = {
  36         .validate_mem = NULL,
  37         .adjust_io_region = NULL,
  38         .find_io = NULL,
  39         .find_mem = NULL,
  40         .add_io = NULL,
  41         .add_mem = NULL,
  42         .init = static_init,
  43         .exit = NULL,
  44 };
  45 EXPORT_SYMBOL(pccard_static_ops);
  46
  47
  48 #ifdef CONFIG_PCCARD_IODYN
  49
  50 static struct resource *
  51 make_resource(unsigned long b, unsigned long n, int flags, char *name)
  52 {
  53         struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
  54
  55         if (res) {
  56                 res->name = name;
  57                 res->start = b;
  58                 res->end = b + n - 1;
  59                 res->flags = flags;
  60         }
  61         return res;
  62 }
  63
  64 struct pcmcia_align_data {
  65         unsigned long   mask;
  66         unsigned long   offset;
  67 };
  68
  69 static resource_size_t pcmcia_align(void *align_data,
  70                                 const struct resource *res,
  71                                 resource_size_t size, resource_size_t align)
  72 {
  73         struct pcmcia_align_data *data = align_data;
  74         resource_size_t start;
  75
  76         start = (res->start & ~data->mask) + data->offset;
  77         if (start < res->start)
  78                 start += data->mask + 1;
  79
  80 #ifdef CONFIG_X86
  81         if (res->flags & IORESOURCE_IO) {
  82                 if (start & 0x300) {
  83                         start = (start + 0x3ff) & ~0x3ff;
  84                 }
  85         }
  86 #endif
  87
  88 #ifdef CONFIG_M68K
  89         if (res->flags & IORESOURCE_IO) {
  90                 if ((res->start + size - 1) >= 1024)
  91                         start = res->end;
  92         }
  93 #endif
  94
  95         return start;
  96 }
  97
  98
  99 static int iodyn_adjust_io_region(struct resource *res, unsigned long r_start,
 100                                       unsigned long r_end, struct pcmcia_socket *s)
 101 {
 102         return adjust_resource(res, r_start, r_end - r_start + 1);
 103 }
 104
 105
 106 static struct resource *iodyn_find_io_region(unsigned long base, int num,
 107                 unsigned long align, struct pcmcia_socket *s)
 108 {
 109         struct resource *res = make_resource(0, num, IORESOURCE_IO,
 110                                              dev_name(&s->dev));
 111         struct pcmcia_align_data data;
 112         unsigned long min = base;
 113         int ret;
 114
 115         if (align == 0)
 116                 align = 0x10000;
 117
 118         data.mask = align - 1;
 119         data.offset = base & data.mask;
 120
 121 #ifdef CONFIG_PCI
 122         if (s->cb_dev) {
 123                 ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
 124                                              min, 0, pcmcia_align, &data);
 125         } else
 126 #endif
 127                 ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
 128                                         1, pcmcia_align, &data);
 129
 130         if (ret != 0) {
 131                 kfree(res);
 132                 res = NULL;
 133         }
 134         return res;
 135 }
 136
 137 struct pccard_resource_ops pccard_iodyn_ops = {
 138         .validate_mem = NULL,
 139         .adjust_io_region = iodyn_adjust_io_region,
 140         .find_io = iodyn_find_io_region,
 141         .find_mem = NULL,
 142         .add_io = NULL,
 143         .add_mem = NULL,
 144         .init = static_init,
 145         .exit = NULL,
 146 };
 147 EXPORT_SYMBOL(pccard_iodyn_ops);
 148
 149 #endif /* CONFIG_PCCARD_IODYN */