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
  25 int pcmcia_validate_mem(struct pcmcia_socket *s)
  26 {
  27         if (s->resource_ops->validate_mem)
  28                 return s->resource_ops->validate_mem(s);
  29         /* if there is no callback, we can assume that everything is OK */
  30         return 0;
  31 }
  32 EXPORT_SYMBOL(pcmcia_validate_mem);
  33
  34 int pcmcia_adjust_io_region(struct resource *res, unsigned long r_start,
  35                      unsigned long r_end, struct pcmcia_socket *s)
  36 {
  37         if (s->resource_ops->adjust_io_region)
  38                 return s->resource_ops->adjust_io_region(res, r_start, r_end, s);
  39         return -ENOMEM;
  40 }
  41 EXPORT_SYMBOL(pcmcia_adjust_io_region);
  42
  43 struct resource *pcmcia_find_io_region(unsigned long base, int num,
  44                    unsigned long align, struct pcmcia_socket *s)
  45 {
  46         if (s->resource_ops->find_io)
  47                 return s->resource_ops->find_io(base, num, align, s);
  48         return NULL;
  49 }
  50 EXPORT_SYMBOL(pcmcia_find_io_region);
  51
  52 struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
  53                                  int low, struct pcmcia_socket *s)
  54 {
  55         if (s->resource_ops->find_mem)
  56                 return s->resource_ops->find_mem(base, num, align, low, s);
  57         return NULL;
  58 }
  59 EXPORT_SYMBOL(pcmcia_find_mem_region);
  60
  61 void release_resource_db(struct pcmcia_socket *s)
  62 {
  63         if (s->resource_ops->exit)
  64                 s->resource_ops->exit(s);
  65 }
  66
  67
  68 static int static_init(struct pcmcia_socket *s)
  69 {
  70         unsigned long flags;
  71
  72         /* the good thing about SS_CAP_STATIC_MAP sockets is
  73          * that they don't need a resource database */
  74
  75         spin_lock_irqsave(&s->lock, flags);
  76         s->resource_setup_done = 1;
  77         spin_unlock_irqrestore(&s->lock, flags);
  78
  79         return 0;
  80 }
  81
  82
  83 struct pccard_resource_ops pccard_static_ops = {
  84         .validate_mem = NULL,
  85         .adjust_io_region = NULL,
  86         .find_io = NULL,
  87         .find_mem = NULL,
  88         .add_io = NULL,
  89         .add_mem = NULL,
  90         .init = static_init,
  91         .exit = NULL,
  92 };
  93 EXPORT_SYMBOL(pccard_static_ops);
  94
  95
  96 #ifdef CONFIG_PCCARD_IODYN
  97
  98 static struct resource *
  99 make_resource(unsigned long b, unsigned long n, int flags, char *name)
 100 {
 101         struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
 102
 103         if (res) {
 104                 res->name = name;
 105                 res->start = b;
 106                 res->end = b + n - 1;
 107                 res->flags = flags;
 108         }
 109         return res;
 110 }
 111
 112 struct pcmcia_align_data {
 113         unsigned long   mask;
 114         unsigned long   offset;
 115 };
 116
 117 static resource_size_t pcmcia_align(void *align_data,
 118                                 const struct resource *res,
 119                                 resource_size_t size, resource_size_t align)
 120 {
 121         struct pcmcia_align_data *data = align_data;
 122         resource_size_t start;
 123
 124         start = (res->start & ~data->mask) + data->offset;
 125         if (start < res->start)
 126                 start += data->mask + 1;
 127
 128 #ifdef CONFIG_X86
 129         if (res->flags & IORESOURCE_IO) {
 130                 if (start & 0x300) {
 131                         start = (start + 0x3ff) & ~0x3ff;
 132                 }
 133         }
 134 #endif
 135
 136 #ifdef CONFIG_M68K
 137         if (res->flags & IORESOURCE_IO) {
 138                 if ((res->start + size - 1) >= 1024)
 139                         start = res->end;
 140         }
 141 #endif
 142
 143         return start;
 144 }
 145
 146
 147 static int iodyn_adjust_io_region(struct resource *res, unsigned long r_start,
 148                                       unsigned long r_end, struct pcmcia_socket *s)
 149 {
 150         return adjust_resource(res, r_start, r_end - r_start + 1);
 151 }
 152
 153
 154 static struct resource *iodyn_find_io_region(unsigned long base, int num,
 155                 unsigned long align, struct pcmcia_socket *s)
 156 {
 157         struct resource *res = make_resource(0, num, IORESOURCE_IO,
 158                                              dev_name(&s->dev));
 159         struct pcmcia_align_data data;
 160         unsigned long min = base;
 161         int ret;
 162
 163         if (align == 0)
 164                 align = 0x10000;
 165
 166         data.mask = align - 1;
 167         data.offset = base & data.mask;
 168
 169 #ifdef CONFIG_PCI
 170         if (s->cb_dev) {
 171                 ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
 172                                              min, 0, pcmcia_align, &data);
 173         } else
 174 #endif
 175                 ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
 176                                         1, pcmcia_align, &data);
 177
 178         if (ret != 0) {
 179                 kfree(res);
 180                 res = NULL;
 181         }
 182         return res;
 183 }
 184
 185 struct pccard_resource_ops pccard_iodyn_ops = {
 186         .validate_mem = NULL,
 187         .adjust_io_region = iodyn_adjust_io_region,
 188         .find_io = iodyn_find_io_region,
 189         .find_mem = NULL,
 190         .add_io = NULL,
 191         .add_mem = NULL,
 192         .init = static_init,
 193         .exit = NULL,
 194 };
 195 EXPORT_SYMBOL(pccard_iodyn_ops);
 196
 197 #endif /* CONFIG_PCCARD_IODYN */