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 #ifdef CONFIG_PCMCIA_IOCTL
  25
  26 #ifdef CONFIG_PCMCIA_PROBE
  27
  28 static int adjust_irq(struct pcmcia_socket *s, adjust_t *adj)
  29 {
  30         int irq;
  31         u32 mask;
  32
  33         irq = adj->resource.irq.IRQ;
  34         if ((irq < 0) || (irq > 15))
  35                 return CS_BAD_IRQ;
  36
  37         if (adj->Action != REMOVE_MANAGED_RESOURCE)
  38                 return 0;
  39
  40         mask = 1 << irq;
  41
  42         if (!(s->irq_mask & mask))
  43                 return 0;
  44
  45         s->irq_mask &= ~mask;
  46
  47         return 0;
  48 }
  49
  50 #else
  51
  52 static inline int adjust_irq(struct pcmcia_socket *s, adjust_t *adj) {
  53         return CS_SUCCESS;
  54 }
  55
  56 #endif
  57
  58
  59 int pcmcia_adjust_resource_info(adjust_t *adj)
  60 {
  61         struct pcmcia_socket *s;
  62         int ret = CS_UNSUPPORTED_FUNCTION;
  63         unsigned long flags;
  64
  65         down_read(&pcmcia_socket_list_rwsem);
  66         list_for_each_entry(s, &pcmcia_socket_list, socket_list) {
  67
  68                 if (adj->Resource == RES_IRQ)
  69                         ret = adjust_irq(s, adj);
  70
  71                 else if (s->resource_ops->adjust_resource) {
  72
  73                         /* you can't use the old interface if the new
  74                          * one was used before */
  75                         spin_lock_irqsave(&s->lock, flags);
  76                         if ((s->resource_setup_new) &&
  77                             !(s->resource_setup_old)) {
  78                                 spin_unlock_irqrestore(&s->lock, flags);
  79                                 continue;
  80                         } else if (!(s->resource_setup_old))
  81                                 s->resource_setup_old = 1;
  82                         spin_unlock_irqrestore(&s->lock, flags);
  83
  84                         ret = s->resource_ops->adjust_resource(s, adj);
  85                         if (!ret) {
  86                                 /* as there's no way we know this is the
  87                                  * last call to adjust_resource_info, we
  88                                  * always need to assume this is the latest
  89                                  * one... */
  90                                 spin_lock_irqsave(&s->lock, flags);
  91                                 s->resource_setup_done = 1;
  92                                 spin_unlock_irqrestore(&s->lock, flags);
  93                         }
  94                 }
  95         }
  96         up_read(&pcmcia_socket_list_rwsem);
  97
  98         return (ret);
  99 }
 100 EXPORT_SYMBOL(pcmcia_adjust_resource_info);
 101
 102 #endif
 103
 104 int pcmcia_validate_mem(struct pcmcia_socket *s)
 105 {
 106         if (s->resource_ops->validate_mem)
 107                 return s->resource_ops->validate_mem(s);
 108         /* if there is no callback, we can assume that everything is OK */
 109         return 0;
 110 }
 111 EXPORT_SYMBOL(pcmcia_validate_mem);
 112
 113 int pcmcia_adjust_io_region(struct resource *res, unsigned long r_start,
 114                      unsigned long r_end, struct pcmcia_socket *s)
 115 {
 116         if (s->resource_ops->adjust_io_region)
 117                 return s->resource_ops->adjust_io_region(res, r_start, r_end, s);
 118         return -ENOMEM;
 119 }
 120 EXPORT_SYMBOL(pcmcia_adjust_io_region);
 121
 122 struct resource *pcmcia_find_io_region(unsigned long base, int num,
 123                    unsigned long align, struct pcmcia_socket *s)
 124 {
 125         if (s->resource_ops->find_io)
 126                 return s->resource_ops->find_io(base, num, align, s);
 127         return NULL;
 128 }
 129 EXPORT_SYMBOL(pcmcia_find_io_region);
 130
 131 struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
 132                                  int low, struct pcmcia_socket *s)
 133 {
 134         if (s->resource_ops->find_mem)
 135                 return s->resource_ops->find_mem(base, num, align, low, s);
 136         return NULL;
 137 }
 138 EXPORT_SYMBOL(pcmcia_find_mem_region);
 139
 140 void release_resource_db(struct pcmcia_socket *s)
 141 {
 142         if (s->resource_ops->exit)
 143                 s->resource_ops->exit(s);
 144 }
 145
 146
 147 static int static_init(struct pcmcia_socket *s)
 148 {
 149         unsigned long flags;
 150
 151         /* the good thing about SS_CAP_STATIC_MAP sockets is
 152          * that they don't need a resource database */
 153
 154         spin_lock_irqsave(&s->lock, flags);
 155         s->resource_setup_done = 1;
 156         spin_unlock_irqrestore(&s->lock, flags);
 157
 158         return 0;
 159 }
 160
 161
 162 struct pccard_resource_ops pccard_static_ops = {
 163         .validate_mem = NULL,
 164         .adjust_io_region = NULL,
 165         .find_io = NULL,
 166         .find_mem = NULL,
 167         .adjust_resource = NULL,
 168         .init = static_init,
 169         .exit = NULL,
 170 };
 171 EXPORT_SYMBOL(pccard_static_ops);
 172
 173
 174 #ifdef CONFIG_PCCARD_IODYN
 175
 176 static struct resource *
 177 make_resource(unsigned long b, unsigned long n, int flags, char *name)
 178 {
 179         struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
 180
 181         if (res) {
 182                 res->name = name;
 183                 res->start = b;
 184                 res->end = b + n - 1;
 185                 res->flags = flags;
 186         }
 187         return res;
 188 }
 189
 190 struct pcmcia_align_data {
 191         unsigned long   mask;
 192         unsigned long   offset;
 193 };
 194
 195 static void pcmcia_align(void *align_data, struct resource *res,
 196                         unsigned long size, unsigned long align)
 197 {
 198         struct pcmcia_align_data *data = align_data;
 199         unsigned long start;
 200
 201         start = (res->start & ~data->mask) + data->offset;
 202         if (start < res->start)
 203                 start += data->mask + 1;
 204         res->start = start;
 205
 206 #ifdef CONFIG_X86
 207         if (res->flags & IORESOURCE_IO) {
 208                 if (start & 0x300) {
 209                         start = (start + 0x3ff) & ~0x3ff;
 210                         res->start = start;
 211                 }
 212         }
 213 #endif
 214
 215 #ifdef CONFIG_M68K
 216         if (res->flags & IORESOURCE_IO) {
 217                 if ((res->start + size - 1) >= 1024)
 218                         res->start = res->end;
 219         }
 220 #endif
 221 }
 222
 223
 224 static int iodyn_adjust_io_region(struct resource *res, unsigned long r_start,
 225                                       unsigned long r_end, struct pcmcia_socket *s)
 226 {
 227         return adjust_resource(res, r_start, r_end - r_start + 1);
 228 }
 229
 230
 231 static struct resource *iodyn_find_io_region(unsigned long base, int num,
 232                 unsigned long align, struct pcmcia_socket *s)
 233 {
 234         struct resource *res = make_resource(0, num, IORESOURCE_IO,
 235                                              s->dev.bus_id);
 236         struct pcmcia_align_data data;
 237         unsigned long min = base;
 238         int ret;
 239
 240         if (align == 0)
 241                 align = 0x10000;
 242
 243         data.mask = align - 1;
 244         data.offset = base & data.mask;
 245
 246 #ifdef CONFIG_PCI
 247         if (s->cb_dev) {
 248                 ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
 249                                              min, 0, pcmcia_align, &data);
 250         } else
 251 #endif
 252                 ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
 253                                         1, pcmcia_align, &data);
 254
 255         if (ret != 0) {
 256                 kfree(res);
 257                 res = NULL;
 258         }
 259         return res;
 260 }
 261
 262 struct pccard_resource_ops pccard_iodyn_ops = {
 263         .validate_mem = NULL,
 264         .adjust_io_region = iodyn_adjust_io_region,
 265         .find_io = iodyn_find_io_region,
 266         .find_mem = NULL,
 267         .adjust_resource = NULL,
 268         .init = static_init,
 269         .exit = NULL,
 270 };
 271 EXPORT_SYMBOL(pccard_iodyn_ops);
 272
 273 #endif /* CONFIG_PCCARD_IODYN */