linux/drivers/pcmcia/rsrc_mgr.c
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   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
  24int 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}
  31EXPORT_SYMBOL(pcmcia_validate_mem);
  32
  33int 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}
  40EXPORT_SYMBOL(pcmcia_adjust_io_region);
  41
  42struct 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}
  49EXPORT_SYMBOL(pcmcia_find_io_region);
  50
  51struct 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}
  58EXPORT_SYMBOL(pcmcia_find_mem_region);
  59
  60void release_resource_db(struct pcmcia_socket *s)
  61{
  62        if (s->resource_ops->exit)
  63                s->resource_ops->exit(s);
  64}
  65
  66
  67static 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
  82struct 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};
  92EXPORT_SYMBOL(pccard_static_ops);
  93
  94
  95#ifdef CONFIG_PCCARD_IODYN
  96
  97static struct resource *
  98make_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
 111struct pcmcia_align_data {
 112        unsigned long   mask;
 113        unsigned long   offset;
 114};
 115
 116static 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
 145static 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
 152static 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
 183struct 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};
 193EXPORT_SYMBOL(pccard_iodyn_ops);
 194
 195#endif /* CONFIG_PCCARD_IODYN */
 196