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 "cs_internal.h"
  22
  23
  24 int pcmcia_validate_mem(struct pcmcia_socket *s)
  25 {
  26         if (s->resource_ops->validate_mem)
  27                 return s->resource_ops->validate_mem(s);
  28         /* if there is no callback, we can assume that everything is OK */
  29         return 0;
  30 }
  31 EXPORT_SYMBOL(pcmcia_validate_mem);
  32
  33 int pcmcia_adjust_io_region(struct resource *res, unsigned long r_start,
  34                      unsigned long r_end, struct pcmcia_socket *s)
  35 {
  36         if (s->resource_ops->adjust_io_region)
  37                 return s->resource_ops->adjust_io_region(res, r_start, r_end, s);
  38         return -ENOMEM;
  39 }
  40 EXPORT_SYMBOL(pcmcia_adjust_io_region);
  41
  42 struct resource *pcmcia_find_io_region(unsigned long base, int num,
  43                    unsigned long align, struct pcmcia_socket *s)
  44 {
  45         if (s->resource_ops->find_io)
  46                 return s->resource_ops->find_io(base, num, align, s);
  47         return NULL;
  48 }
  49 EXPORT_SYMBOL(pcmcia_find_io_region);
  50
  51 struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
  52                                  int low, struct pcmcia_socket *s)
  53 {
  54         if (s->resource_ops->find_mem)
  55                 return s->resource_ops->find_mem(base, num, align, low, s);
  56         return NULL;
  57 }
  58 EXPORT_SYMBOL(pcmcia_find_mem_region);
  59
  60 void release_resource_db(struct pcmcia_socket *s)
  61 {
  62         if (s->resource_ops->exit)
  63                 s->resource_ops->exit(s);
  64 }
  65
  66
  67 static int static_init(struct pcmcia_socket *s)
  68 {
  69         unsigned long flags;
  70
  71         /* the good thing about SS_CAP_STATIC_MAP sockets is
  72          * that they don't need a resource database */
  73
  74         spin_lock_irqsave(&s->lock, flags);
  75         s->resource_setup_done = 1;
  76         spin_unlock_irqrestore(&s->lock, flags);
  77
  78         return 0;
  79 }
  80
  81
  82 struct pccard_resource_ops pccard_static_ops = {
  83         .validate_mem = NULL,
  84         .adjust_io_region = NULL,
  85         .find_io = NULL,
  86         .find_mem = NULL,
  87         .add_io = NULL,
  88         .add_mem = NULL,
  89         .init = static_init,
  90         .exit = NULL,
  91 };
  92 EXPORT_SYMBOL(pccard_static_ops);
  93
  94
  95 #ifdef CONFIG_PCCARD_IODYN
  96
  97 static struct resource *
  98 make_resource(unsigned long b, unsigned long n, int flags, char *name)
  99 {
 100         struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
 101
 102         if (res) {
 103                 res->name = name;
 104                 res->start = b;
 105                 res->end = b + n - 1;
 106                 res->flags = flags;
 107         }
 108         return res;
 109 }
 110
 111 struct pcmcia_align_data {
 112         unsigned long   mask;
 113         unsigned long   offset;
 114 };
 115
 116 static void pcmcia_align(void *align_data, struct resource *res,
 117                         unsigned long size, unsigned long align)
 118 {
 119         struct pcmcia_align_data *data = align_data;
 120         unsigned long start;
 121
 122         start = (res->start & ~data->mask) + data->offset;
 123         if (start < res->start)
 124                 start += data->mask + 1;
 125         res->start = start;
 126
 127 #ifdef CONFIG_X86
 128         if (res->flags & IORESOURCE_IO) {
 129                 if (start & 0x300) {
 130                         start = (start + 0x3ff) & ~0x3ff;
 131                         res->start = start;
 132                 }
 133         }
 134 #endif
 135
 136 #ifdef CONFIG_M68K
 137         if (res->flags & IORESOURCE_IO) {
 138                 if ((res->start + size - 1) >= 1024)
 139                         res->start = res->end;
 140         }
 141 #endif
 142 }
 143
 144
 145 static int iodyn_adjust_io_region(struct resource *res, unsigned long r_start,
 146                                       unsigned long r_end, struct pcmcia_socket *s)
 147 {
 148         return adjust_resource(res, r_start, r_end - r_start + 1);
 149 }
 150
 151
 152 static struct resource *iodyn_find_io_region(unsigned long base, int num,
 153                 unsigned long align, struct pcmcia_socket *s)
 154 {
 155         struct resource *res = make_resource(0, num, IORESOURCE_IO,
 156                                              s->dev.bus_id);
 157         struct pcmcia_align_data data;
 158         unsigned long min = base;
 159         int ret;
 160
 161         if (align == 0)
 162                 align = 0x10000;
 163
 164         data.mask = align - 1;
 165         data.offset = base & data.mask;
 166
 167 #ifdef CONFIG_PCI
 168         if (s->cb_dev) {
 169                 ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
 170                                              min, 0, pcmcia_align, &data);
 171         } else
 172 #endif
 173                 ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
 174                                         1, pcmcia_align, &data);
 175
 176         if (ret != 0) {
 177                 kfree(res);
 178                 res = NULL;
 179         }
 180         return res;
 181 }
 182
 183 struct pccard_resource_ops pccard_iodyn_ops = {
 184         .validate_mem = NULL,
 185         .adjust_io_region = iodyn_adjust_io_region,
 186         .find_io = iodyn_find_io_region,
 187         .find_mem = NULL,
 188         .add_io = NULL,
 189         .add_mem = NULL,
 190         .init = static_init,
 191         .exit = NULL,
 192 };
 193 EXPORT_SYMBOL(pccard_iodyn_ops);
 194
 195 #endif /* CONFIG_PCCARD_IODYN */