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);