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 void pcmcia_align(void *align_data, struct resource *res,
 118                         unsigned long size, unsigned long align)
 119 {
 120         struct pcmcia_align_data *data = align_data;
 121         unsigned long start;
 122
 123         start = (res->start & ~data->mask) + data->offset;
 124         if (start < res->start)
 125                 start += data->mask + 1;
 126         res->start = start;
 127
 128 #ifdef CONFIG_X86
 129         if (res->flags & IORESOURCE_IO) {
 130                 if (start & 0x300) {
 131                         start = (start + 0x3ff) & ~0x3ff;
 132                         res->start = start;
 133                 }
 134         }
 135 #endif
 136
 137 #ifdef CONFIG_M68K
 138         if (res->flags & IORESOURCE_IO) {
 139                 if ((res->start + size - 1) >= 1024)
 140                         res->start = res->end;
 141         }
 142 #endif
 143 }
 144
 145
 146 static int iodyn_adjust_io_region(struct resource *res, unsigned long r_start,
 147                                       unsigned long r_end, struct pcmcia_socket *s)
 148 {
 149         return adjust_resource(res, r_start, r_end - r_start + 1);
 150 }
 151
 152
 153 static struct resource *iodyn_find_io_region(unsigned long base, int num,
 154                 unsigned long align, struct pcmcia_socket *s)
 155 {
 156         struct resource *res = make_resource(0, num, IORESOURCE_IO,
 157                                              dev_name(&s->dev));
 158         struct pcmcia_align_data data;
 159         unsigned long min = base;
 160         int ret;
 161
 162         if (align == 0)
 163                 align = 0x10000;
 164
 165         data.mask = align - 1;
 166         data.offset = base & data.mask;
 167
 168 #ifdef CONFIG_PCI
 169         if (s->cb_dev) {
 170                 ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
 171                                              min, 0, pcmcia_align, &data);
 172         } else
 173 #endif
 174                 ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
 175                                         1, pcmcia_align, &data);
 176
 177         if (ret != 0) {
 178                 kfree(res);
 179                 res = NULL;
 180         }
 181         return res;
 182 }
 183
 184 struct pccard_resource_ops pccard_iodyn_ops = {
 185         .validate_mem = NULL,
 186         .adjust_io_region = iodyn_adjust_io_region,
 187         .find_io = iodyn_find_io_region,
 188         .find_mem = NULL,
 189         .add_io = NULL,
 190         .add_mem = NULL,
 191         .init = static_init,
 192         .exit = NULL,
 193 };
 194 EXPORT_SYMBOL(pccard_iodyn_ops);
 195
 196 #endif /* CONFIG_PCCARD_IODYN */