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/config.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18
  19 #include <pcmcia/cs_types.h>
  20 #include <pcmcia/ss.h>
  21 #include <pcmcia/cs.h>
  22 #include "cs_internal.h"
  23
  24
  25 #ifdef CONFIG_PCMCIA_PROBE
  26
  27 static int adjust_irq(struct pcmcia_socket *s, adjust_t *adj)
  28 {
  29         int irq;
  30         u32 mask;
  31
  32         irq = adj->resource.irq.IRQ;
  33         if ((irq < 0) || (irq > 15))
  34                 return CS_BAD_IRQ;
  35
  36         if (adj->Action != REMOVE_MANAGED_RESOURCE)
  37                 return 0;
  38
  39         mask = 1 << irq;
  40
  41         if (!(s->irq_mask & mask))
  42                 return 0;
  43
  44         s->irq_mask &= ~mask;
  45
  46         return 0;
  47 }
  48
  49 #else
  50
  51 static inline int adjust_irq(struct pcmcia_socket *s, adjust_t *adj) {
  52         return CS_SUCCESS;
  53 }
  54
  55 #endif
  56
  57
  58 int pcmcia_adjust_resource_info(adjust_t *adj)
  59 {
  60         struct pcmcia_socket *s;
  61         int ret = CS_UNSUPPORTED_FUNCTION;
  62         unsigned long flags;
  63
  64         down_read(&pcmcia_socket_list_rwsem);
  65         list_for_each_entry(s, &pcmcia_socket_list, socket_list) {
  66
  67                 if (adj->Resource == RES_IRQ)
  68                         ret = adjust_irq(s, adj);
  69
  70                 else if (s->resource_ops->adjust_resource) {
  71
  72                         /* you can't use the old interface if the new
  73                          * one was used before */
  74                         spin_lock_irqsave(&s->lock, flags);
  75                         if ((s->resource_setup_new) &&
  76                             !(s->resource_setup_old)) {
  77                                 spin_unlock_irqrestore(&s->lock, flags);
  78                                 continue;
  79                         } else if (!(s->resource_setup_old))
  80                                 s->resource_setup_old = 1;
  81                         spin_unlock_irqrestore(&s->lock, flags);
  82
  83                         ret = s->resource_ops->adjust_resource(s, adj);
  84                         if (!ret) {
  85                                 /* as there's no way we know this is the
  86                                  * last call to adjust_resource_info, we
  87                                  * always need to assume this is the latest
  88                                  * one... */
  89                                 spin_lock_irqsave(&s->lock, flags);
  90                                 s->resource_setup_done = 1;
  91                                 spin_unlock_irqrestore(&s->lock, flags);
  92                         }
  93                 }
  94         }
  95         up_read(&pcmcia_socket_list_rwsem);
  96
  97         return (ret);
  98 }
  99 EXPORT_SYMBOL(pcmcia_adjust_resource_info);
 100
 101 int pcmcia_validate_mem(struct pcmcia_socket *s)
 102 {
 103         if (s->resource_ops->validate_mem)
 104                 return s->resource_ops->validate_mem(s);
 105         /* if there is no callback, we can assume that everything is OK */
 106         return 0;
 107 }
 108 EXPORT_SYMBOL(pcmcia_validate_mem);
 109
 110 int pcmcia_adjust_io_region(struct resource *res, unsigned long r_start,
 111                      unsigned long r_end, struct pcmcia_socket *s)
 112 {
 113         if (s->resource_ops->adjust_io_region)
 114                 return s->resource_ops->adjust_io_region(res, r_start, r_end, s);
 115         return -ENOMEM;
 116 }
 117 EXPORT_SYMBOL(pcmcia_adjust_io_region);
 118
 119 struct resource *pcmcia_find_io_region(unsigned long base, int num,
 120                    unsigned long align, struct pcmcia_socket *s)
 121 {
 122         if (s->resource_ops->find_io)
 123                 return s->resource_ops->find_io(base, num, align, s);
 124         return NULL;
 125 }
 126 EXPORT_SYMBOL(pcmcia_find_io_region);
 127
 128 struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
 129                                  int low, struct pcmcia_socket *s)
 130 {
 131         if (s->resource_ops->find_mem)
 132                 return s->resource_ops->find_mem(base, num, align, low, s);
 133         return NULL;
 134 }
 135 EXPORT_SYMBOL(pcmcia_find_mem_region);
 136
 137 void release_resource_db(struct pcmcia_socket *s)
 138 {
 139         if (s->resource_ops->exit)
 140                 s->resource_ops->exit(s);
 141 }
 142
 143
 144 static int static_init(struct pcmcia_socket *s)
 145 {
 146         unsigned long flags;
 147
 148         /* the good thing about SS_CAP_STATIC_MAP sockets is
 149          * that they don't need a resource database */
 150
 151         spin_lock_irqsave(&s->lock, flags);
 152         s->resource_setup_done = 1;
 153         spin_unlock_irqrestore(&s->lock, flags);
 154
 155         return 0;
 156 }
 157
 158
 159 struct pccard_resource_ops pccard_static_ops = {
 160         .validate_mem = NULL,
 161         .adjust_io_region = NULL,
 162         .find_io = NULL,
 163         .find_mem = NULL,
 164         .adjust_resource = NULL,
 165         .init = static_init,
 166         .exit = NULL,
 167 };
 168 EXPORT_SYMBOL(pccard_static_ops);
 169
 170
 171 #ifdef CONFIG_PCCARD_IODYN
 172
 173 static struct resource *
 174 make_resource(unsigned long b, unsigned long n, int flags, char *name)
 175 {
 176         struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
 177
 178         if (res) {
 179                 res->name = name;
 180                 res->start = b;
 181                 res->end = b + n - 1;
 182                 res->flags = flags;
 183         }
 184         return res;
 185 }
 186
 187 struct pcmcia_align_data {
 188         unsigned long   mask;
 189         unsigned long   offset;
 190 };
 191
 192 static void pcmcia_align(void *align_data, struct resource *res,
 193                         unsigned long size, unsigned long align)
 194 {
 195         struct pcmcia_align_data *data = align_data;
 196         unsigned long start;
 197
 198         start = (res->start & ~data->mask) + data->offset;
 199         if (start < res->start)
 200                 start += data->mask + 1;
 201         res->start = start;
 202
 203 #ifdef CONFIG_X86
 204         if (res->flags & IORESOURCE_IO) {
 205                 if (start & 0x300) {
 206                         start = (start + 0x3ff) & ~0x3ff;
 207                         res->start = start;
 208                 }
 209         }
 210 #endif
 211
 212 #ifdef CONFIG_M68K
 213         if (res->flags & IORESOURCE_IO) {
 214                 if ((res->start + size - 1) >= 1024)
 215                         res->start = res->end;
 216         }
 217 #endif
 218 }
 219
 220
 221 static int iodyn_adjust_io_region(struct resource *res, unsigned long r_start,
 222                                       unsigned long r_end, struct pcmcia_socket *s)
 223 {
 224         return adjust_resource(res, r_start, r_end - r_start + 1);
 225 }
 226
 227
 228 static struct resource *iodyn_find_io_region(unsigned long base, int num,
 229                 unsigned long align, struct pcmcia_socket *s)
 230 {
 231         struct resource *res = make_resource(0, num, IORESOURCE_IO,
 232                                              s->dev.class_id);
 233         struct pcmcia_align_data data;
 234         unsigned long min = base;
 235         int ret;
 236
 237         if (align == 0)
 238                 align = 0x10000;
 239
 240         data.mask = align - 1;
 241         data.offset = base & data.mask;
 242
 243 #ifdef CONFIG_PCI
 244         if (s->cb_dev) {
 245                 ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
 246                                              min, 0, pcmcia_align, &data);
 247         } else
 248 #endif
 249                 ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
 250                                         1, pcmcia_align, &data);
 251
 252         if (ret != 0) {
 253                 kfree(res);
 254                 res = NULL;
 255         }
 256         return res;
 257 }
 258
 259 struct pccard_resource_ops pccard_iodyn_ops = {
 260         .validate_mem = NULL,
 261         .adjust_io_region = iodyn_adjust_io_region,
 262         .find_io = iodyn_find_io_region,
 263         .find_mem = NULL,
 264         .adjust_resource = NULL,
 265         .init = static_init,
 266         .exit = NULL,
 267 };
 268 EXPORT_SYMBOL(pccard_iodyn_ops);
 269
 270 #endif /* CONFIG_PCCARD_IODYN */